Squashed 'third_party/rawrtc/usrsctp/' content from commit bd1a92db3
Change-Id: If227cd6edd3243ac26044056b7427ae5bca71ef8
git-subtree-dir: third_party/rawrtc/usrsctp
git-subtree-split: bd1a92db338ba1e57453637959a127032bb566ff
diff --git a/usrsctplib/netinet/sctp_input.c b/usrsctplib/netinet/sctp_input.c
new file mode 100755
index 0000000..4e8da4e
--- /dev/null
+++ b/usrsctplib/netinet/sctp_input.c
@@ -0,0 +1,6609 @@
+/*-
+ * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * b) Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the distribution.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef __FreeBSD__
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 310590 2016-12-26 11:06:41Z tuexen $");
+#endif
+
+#include <netinet/sctp_os.h>
+#include <netinet/sctp_var.h>
+#include <netinet/sctp_sysctl.h>
+#include <netinet/sctp_pcb.h>
+#include <netinet/sctp_header.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_output.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp_auth.h>
+#include <netinet/sctp_indata.h>
+#include <netinet/sctp_asconf.h>
+#include <netinet/sctp_bsd_addr.h>
+#include <netinet/sctp_timer.h>
+#include <netinet/sctp_crc32.h>
+#if defined(INET) || defined(INET6)
+#if !defined(__Userspace_os_Windows)
+#include <netinet/udp.h>
+#endif
+#endif
+#if defined(__FreeBSD__)
+#include <sys/smp.h>
+#endif
+#if defined(__Userspace__)
+#include <user_socketvar.h>
+#endif
+
+#if defined(__APPLE__)
+#define APPLE_FILE_NO 2
+#endif
+
+
+static void
+sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
+{
+ struct sctp_nets *net;
+
+ /* This now not only stops all cookie timers
+ * it also stops any INIT timers as well. This
+ * will make sure that the timers are stopped in
+ * all collision cases.
+ */
+ SCTP_TCB_LOCK_ASSERT(stcb);
+ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+ if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
+ sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
+ stcb->sctp_ep,
+ stcb,
+ net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
+ } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
+ sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
+ stcb->sctp_ep,
+ stcb,
+ net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
+ }
+ }
+}
+
+/* INIT handler */
+static void
+sctp_handle_init(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+ struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ struct sctp_init *init;
+ struct mbuf *op_err;
+
+ SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
+ (void *)stcb);
+ if (stcb == NULL) {
+ SCTP_INP_RLOCK(inp);
+ }
+ /* validate length */
+ if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) {
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ /* validate parameters */
+ init = &cp->init;
+ if (init->initiate_tag == 0) {
+ /* protocol error... send abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) {
+ /* invalid parameter... send abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ if (init->num_inbound_streams == 0) {
+ /* protocol error... send abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ if (init->num_outbound_streams == 0) {
+ /* protocol error... send abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
+ offset + ntohs(cp->ch.chunk_length))) {
+ /* auth parameter(s) error... send abort */
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ "Problem with AUTH parameters");
+ sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ if (stcb)
+ *abort_no_unlock = 1;
+ goto outnow;
+ }
+ /* We are only accepting if we have a socket with positive so_qlimit.*/
+ if ((stcb == NULL) &&
+ ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
+ (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
+ (inp->sctp_socket == NULL) ||
+ (inp->sctp_socket->so_qlimit == 0))) {
+ /*
+ * FIX ME ?? What about TCP model and we have a
+ * match/restart case? Actually no fix is needed.
+ * the lookup will always find the existing assoc so stcb
+ * would not be NULL. It may be questionable to do this
+ * since we COULD just send back the INIT-ACK and hope that
+ * the app did accept()'s by the time the COOKIE was sent. But
+ * there is a price to pay for COOKIE generation and I don't
+ * want to pay it on the chance that the app will actually do
+ * some accepts(). The App just looses and should NOT be in
+ * this state :-)
+ */
+ if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ "No listener");
+ sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, port);
+ }
+ goto outnow;
+ }
+ if ((stcb != NULL) &&
+ (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
+ SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
+ sctp_send_shutdown_ack(stcb, NULL);
+ sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+ } else {
+ SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
+ sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
+ src, dst, sh, cp,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port,
+ ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED));
+ }
+ outnow:
+ if (stcb == NULL) {
+ SCTP_INP_RUNLOCK(inp);
+ }
+}
+
+/*
+ * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
+ */
+
+int
+sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked
+#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
+ SCTP_UNUSED
+#endif
+)
+{
+ int unsent_data;
+ unsigned int i;
+ struct sctp_stream_queue_pending *sp;
+ struct sctp_association *asoc;
+
+ /* This function returns if any stream has true unsent data on it.
+ * Note that as it looks through it will clean up any places that
+ * have old data that has been sent but left at top of stream queue.
+ */
+ asoc = &stcb->asoc;
+ unsent_data = 0;
+ SCTP_TCB_SEND_LOCK(stcb);
+ if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
+ /* Check to see if some data queued */
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ /*sa_ignore FREED_MEMORY*/
+ sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
+ if (sp == NULL) {
+ continue;
+ }
+ if ((sp->msg_is_complete) &&
+ (sp->length == 0) &&
+ (sp->sender_all_done)) {
+ /* We are doing differed cleanup. Last
+ * time through when we took all the data
+ * the sender_all_done was not set.
+ */
+ if (sp->put_last_out == 0) {
+ SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
+ SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
+ sp->sender_all_done,
+ sp->length,
+ sp->msg_is_complete,
+ sp->put_last_out);
+ }
+ atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
+ TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
+ stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1);
+ if (sp->net) {
+ sctp_free_remote_addr(sp->net);
+ sp->net = NULL;
+ }
+ if (sp->data) {
+ sctp_m_freem(sp->data);
+ sp->data = NULL;
+ }
+ sctp_free_a_strmoq(stcb, sp, so_locked);
+ if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
+ unsent_data++;
+ }
+ } else {
+ unsent_data++;
+ }
+ if (unsent_data > 0) {
+ break;
+ }
+ }
+ }
+ SCTP_TCB_SEND_UNLOCK(stcb);
+ return (unsent_data);
+}
+
+static int
+sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
+{
+ struct sctp_init *init;
+ struct sctp_association *asoc;
+ struct sctp_nets *lnet;
+ unsigned int i;
+
+ init = &cp->init;
+ asoc = &stcb->asoc;
+ /* save off parameters */
+ asoc->peer_vtag = ntohl(init->initiate_tag);
+ asoc->peers_rwnd = ntohl(init->a_rwnd);
+ /* init tsn's */
+ asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
+
+ if (!TAILQ_EMPTY(&asoc->nets)) {
+ /* update any ssthresh's that may have a default */
+ TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
+ lnet->ssthresh = asoc->peers_rwnd;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
+ sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
+ }
+
+ }
+ }
+ SCTP_TCB_SEND_LOCK(stcb);
+ if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
+ unsigned int newcnt;
+ struct sctp_stream_out *outs;
+ struct sctp_stream_queue_pending *sp, *nsp;
+ struct sctp_tmit_chunk *chk, *nchk;
+
+ /* abandon the upper streams */
+ newcnt = ntohs(init->num_inbound_streams);
+ TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
+ if (chk->rec.data.sid >= newcnt) {
+ TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
+ asoc->send_queue_cnt--;
+ if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
+ asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
+#ifdef INVARIANTS
+ } else {
+ panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
+#endif
+ }
+ if (chk->data != NULL) {
+ sctp_free_bufspace(stcb, asoc, chk, 1);
+ sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
+ 0, chk, SCTP_SO_NOT_LOCKED);
+ if (chk->data) {
+ sctp_m_freem(chk->data);
+ chk->data = NULL;
+ }
+ }
+ sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+ /*sa_ignore FREED_MEMORY*/
+ }
+ }
+ if (asoc->strmout) {
+ for (i = newcnt; i < asoc->pre_open_streams; i++) {
+ outs = &asoc->strmout[i];
+ TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
+ atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
+ TAILQ_REMOVE(&outs->outqueue, sp, next);
+ stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1);
+ sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
+ stcb, 0, sp, SCTP_SO_NOT_LOCKED);
+ if (sp->data) {
+ sctp_m_freem(sp->data);
+ sp->data = NULL;
+ }
+ if (sp->net) {
+ sctp_free_remote_addr(sp->net);
+ sp->net = NULL;
+ }
+ /* Free the chunk */
+ sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
+ /*sa_ignore FREED_MEMORY*/
+ }
+ outs->state = SCTP_STREAM_CLOSED;
+ }
+ }
+ /* cut back the count */
+ asoc->pre_open_streams = newcnt;
+ }
+ SCTP_TCB_SEND_UNLOCK(stcb);
+ asoc->streamoutcnt = asoc->pre_open_streams;
+ if (asoc->strmout) {
+ for (i = 0; i < asoc->streamoutcnt; i++) {
+ asoc->strmout[i].state = SCTP_STREAM_OPEN;
+ }
+ }
+ /* EY - nr_sack: initialize highest tsn in nr_mapping_array */
+ asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+ sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+ }
+ /* This is the next one we expect */
+ asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
+
+ asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
+ asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
+
+ asoc->advanced_peer_ack_point = asoc->last_acked_seq;
+ /* open the requested streams */
+
+ if (asoc->strmin != NULL) {
+ /* Free the old ones */
+ for (i = 0; i < asoc->streamincnt; i++) {
+ sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
+ sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
+ }
+ SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
+ }
+ if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
+ asoc->streamincnt = ntohs(init->num_outbound_streams);
+ } else {
+ asoc->streamincnt = asoc->max_inbound_streams;
+ }
+ SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
+ sizeof(struct sctp_stream_in), SCTP_M_STRMI);
+ if (asoc->strmin == NULL) {
+ /* we didn't get memory for the streams! */
+ SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
+ return (-1);
+ }
+ for (i = 0; i < asoc->streamincnt; i++) {
+ asoc->strmin[i].sid = i;
+ asoc->strmin[i].last_mid_delivered = 0xffffffff;
+ TAILQ_INIT(&asoc->strmin[i].inqueue);
+ TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
+ asoc->strmin[i].pd_api_started = 0;
+ asoc->strmin[i].delivery_started = 0;
+ }
+ /*
+ * load_address_from_init will put the addresses into the
+ * association when the COOKIE is processed or the INIT-ACK is
+ * processed. Both types of COOKIE's existing and new call this
+ * routine. It will remove addresses that are no longer in the
+ * association (for the restarting case where addresses are
+ * removed). Up front when the INIT arrives we will discard it if it
+ * is a restart and new addresses have been added.
+ */
+ /* sa_ignore MEMLEAK */
+ return (0);
+}
+
+/*
+ * INIT-ACK message processing/consumption returns value < 0 on error
+ */
+static int
+sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+ struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
+ struct sctp_nets *net, int *abort_no_unlock,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id)
+{
+ struct sctp_association *asoc;
+ struct mbuf *op_err;
+ int retval, abort_flag;
+ uint32_t initack_limit;
+ int nat_friendly = 0;
+
+ /* First verify that we have no illegal param's */
+ abort_flag = 0;
+
+ op_err = sctp_arethere_unrecognized_parameters(m,
+ (offset + sizeof(struct sctp_init_chunk)),
+ &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly);
+ if (abort_flag) {
+ /* Send an abort and notify peer */
+ sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ asoc = &stcb->asoc;
+ asoc->peer_supports_nat = (uint8_t)nat_friendly;
+ /* process the peer's parameters in the INIT-ACK */
+ retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb);
+ if (retval < 0) {
+ return (retval);
+ }
+ initack_limit = offset + ntohs(cp->ch.chunk_length);
+ /* load all addresses */
+ if ((retval = sctp_load_addresses_from_init(stcb, m,
+ (offset + sizeof(struct sctp_init_chunk)), initack_limit,
+ src, dst, NULL, stcb->asoc.port))) {
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ "Problem with address parameters");
+ SCTPDBG(SCTP_DEBUG_INPUT1,
+ "Load addresses from INIT causes an abort %d\n",
+ retval);
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ /* if the peer doesn't support asconf, flush the asconf queue */
+ if (asoc->asconf_supported == 0) {
+ struct sctp_asconf_addr *param, *nparam;
+
+ TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
+ TAILQ_REMOVE(&asoc->asconf_queue, param, next);
+ SCTP_FREE(param, SCTP_M_ASC_ADDR);
+ }
+ }
+
+ stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
+ stcb->asoc.local_hmacs);
+ if (op_err) {
+ sctp_queue_op_err(stcb, op_err);
+ /* queuing will steal away the mbuf chain to the out queue */
+ op_err = NULL;
+ }
+ /* extract the cookie and queue it to "echo" it back... */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ net->error_count = 0;
+
+ /*
+ * Cancel the INIT timer, We do this first before queueing the
+ * cookie. We always cancel at the primary to assue that we are
+ * canceling the timer started by the INIT which always goes to the
+ * primary.
+ */
+ sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
+ asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
+
+ /* calculate the RTO */
+ net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy,
+ SCTP_RTT_FROM_NON_DATA);
+#if defined(__Userspace__)
+ if (stcb->sctp_ep->recv_callback) {
+ if (stcb->sctp_socket) {
+ uint32_t inqueue_bytes, sb_free_now;
+ struct sctp_inpcb *inp;
+
+ inp = stcb->sctp_ep;
+ inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
+ sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv);
+
+ /* check if the amount free in the send socket buffer crossed the threshold */
+ if (inp->send_callback &&
+ (((inp->send_sb_threshold > 0) &&
+ (sb_free_now >= inp->send_sb_threshold) &&
+ (stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) ||
+ (inp->send_sb_threshold == 0))) {
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ inp->send_callback(stcb->sctp_socket, sb_free_now);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ }
+ }
+ }
+#endif
+ retval = sctp_send_cookie_echo(m, offset, stcb, net);
+ if (retval < 0) {
+ /*
+ * No cookie, we probably should send a op error. But in any
+ * case if there is no cookie in the INIT-ACK, we can
+ * abandon the peer, its broke.
+ */
+ if (retval == -3) {
+ uint16_t len;
+
+ len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
+ /* We abort with an error of missing mandatory param */
+ op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
+ if (op_err != NULL) {
+ struct sctp_error_missing_param *cause;
+
+ SCTP_BUF_LEN(op_err) = len;
+ cause = mtod(op_err, struct sctp_error_missing_param *);
+ /* Subtract the reserved param */
+ cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
+ cause->cause.length = htons(len);
+ cause->num_missing_params = htonl(1);
+ cause->type[0] = htons(SCTP_STATE_COOKIE);
+ }
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ }
+ return (retval);
+ }
+
+ return (0);
+}
+
+static void
+sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
+ struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ union sctp_sockstore store;
+ struct sctp_nets *r_net, *f_net;
+ struct timeval tv;
+ int req_prim = 0;
+ uint16_t old_error_counter;
+
+ if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
+ /* Invalid length */
+ return;
+ }
+
+ memset(&store, 0, sizeof(store));
+ switch (cp->heartbeat.hb_info.addr_family) {
+#ifdef INET
+ case AF_INET:
+ if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
+ store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SIN_LEN
+ store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
+#endif
+ store.sin.sin_port = stcb->rport;
+ memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
+ sizeof(store.sin.sin_addr));
+ } else {
+ return;
+ }
+ break;
+#endif
+#ifdef INET6
+ case AF_INET6:
+ if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
+ store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SIN6_LEN
+ store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
+#endif
+ store.sin6.sin6_port = stcb->rport;
+ memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
+ } else {
+ return;
+ }
+ break;
+#endif
+#if defined(__Userspace__)
+ case AF_CONN:
+ if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
+ store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SCONN_LEN
+ store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len;
+#endif
+ store.sconn.sconn_port = stcb->rport;
+ memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *));
+ } else {
+ return;
+ }
+ break;
+#endif
+ default:
+ return;
+ }
+ r_net = sctp_findnet(stcb, &store.sa);
+ if (r_net == NULL) {
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
+ return;
+ }
+ if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
+ (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
+ (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
+ /*
+ * If the its a HB and it's random value is correct when can
+ * confirm the destination.
+ */
+ r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
+ if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
+ stcb->asoc.primary_destination = r_net;
+ r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
+ f_net = TAILQ_FIRST(&stcb->asoc.nets);
+ if (f_net != r_net) {
+ /* first one on the list is NOT the primary
+ * sctp_cmpaddr() is much more efficient if
+ * the primary is the first on the list, make it
+ * so.
+ */
+ TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
+ TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
+ }
+ req_prim = 1;
+ }
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+ stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
+ r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
+ sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
+ }
+ old_error_counter = r_net->error_count;
+ r_net->error_count = 0;
+ r_net->hb_responded = 1;
+ tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
+ tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
+ /* Now lets do a RTO with this */
+ r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy,
+ SCTP_RTT_FROM_NON_DATA);
+ if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) {
+ r_net->dest_state |= SCTP_ADDR_REACHABLE;
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
+ 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
+ }
+ if (r_net->dest_state & SCTP_ADDR_PF) {
+ r_net->dest_state &= ~SCTP_ADDR_PF;
+ stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
+ }
+ if (old_error_counter > 0) {
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
+ stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
+ sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
+ }
+ if (r_net == stcb->asoc.primary_destination) {
+ if (stcb->asoc.alternate) {
+ /* release the alternate, primary is good */
+ sctp_free_remote_addr(stcb->asoc.alternate);
+ stcb->asoc.alternate = NULL;
+ }
+ }
+ /* Mobility adaptation */
+ if (req_prim) {
+ if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
+ SCTP_MOBILITY_BASE) ||
+ sctp_is_mobility_feature_on(stcb->sctp_ep,
+ SCTP_MOBILITY_FASTHANDOFF)) &&
+ sctp_is_mobility_feature_on(stcb->sctp_ep,
+ SCTP_MOBILITY_PRIM_DELETED)) {
+
+ sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
+ stcb->sctp_ep, stcb, NULL,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
+ if (sctp_is_mobility_feature_on(stcb->sctp_ep,
+ SCTP_MOBILITY_FASTHANDOFF)) {
+ sctp_assoc_immediate_retrans(stcb,
+ stcb->asoc.primary_destination);
+ }
+ if (sctp_is_mobility_feature_on(stcb->sctp_ep,
+ SCTP_MOBILITY_BASE)) {
+ sctp_move_chunks_from_net(stcb,
+ stcb->asoc.deleted_primary);
+ }
+ sctp_delete_prim_timer(stcb->sctp_ep, stcb,
+ stcb->asoc.deleted_primary);
+ }
+ }
+}
+
+static int
+sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
+{
+ /* return 0 means we want you to proceed with the abort
+ * non-zero means no abort processing
+ */
+ struct sctpasochead *head;
+
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) {
+ /* generate a new vtag and send init */
+ LIST_REMOVE(stcb, sctp_asocs);
+ stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
+ head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
+ /* put it in the bucket in the vtag hash of assoc's for the system */
+ LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+ sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+ return (1);
+ }
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
+ /* treat like a case where the cookie expired i.e.:
+ * - dump current cookie.
+ * - generate a new vtag.
+ * - resend init.
+ */
+ /* generate a new vtag and send init */
+ LIST_REMOVE(stcb, sctp_asocs);
+ stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED;
+ stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT;
+ sctp_stop_all_cookie_timers(stcb);
+ sctp_toss_old_cookies(stcb, &stcb->asoc);
+ stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
+ head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
+ /* put it in the bucket in the vtag hash of assoc's for the system */
+ LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+ sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+ return (1);
+ }
+ return (0);
+}
+
+static int
+sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ /* return 0 means we want you to proceed with the abort
+ * non-zero means no abort processing
+ */
+ if (stcb->asoc.auth_supported == 0) {
+ SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
+ return (0);
+ }
+ sctp_asconf_send_nat_state_update(stcb, net);
+ return (1);
+}
+
+
+static void
+sctp_handle_abort(struct sctp_abort_chunk *abort,
+ struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+ uint16_t len;
+ uint16_t error;
+
+ SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
+ if (stcb == NULL)
+ return;
+
+ len = ntohs(abort->ch.chunk_length);
+ if (len > sizeof (struct sctp_chunkhdr)) {
+ /* Need to check the cause codes for our
+ * two magic nat aborts which don't kill the assoc
+ * necessarily.
+ */
+ struct sctp_gen_error_cause *cause;
+
+ cause = (struct sctp_gen_error_cause *)(abort + 1);
+ error = ntohs(cause->code);
+ if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
+ abort->ch.chunk_flags);
+ if (sctp_handle_nat_colliding_state(stcb)) {
+ return;
+ }
+ } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
+ abort->ch.chunk_flags);
+ if (sctp_handle_nat_missing_state(stcb, net)) {
+ return;
+ }
+ }
+ } else {
+ error = 0;
+ }
+ /* stop any receive timers */
+ sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
+ /* notify user of the abort and clean up... */
+ sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED);
+ /* free the tcb */
+ SCTP_STAT_INCR_COUNTER32(sctps_aborted);
+ if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) ||
+ (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+ SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+ }
+#ifdef SCTP_ASOCLOG_OF_TSNS
+ sctp_print_out_track_log(stcb);
+#endif
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ stcb->asoc.state |= SCTP_STATE_WAS_ABORTED;
+ (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
+}
+
+static void
+sctp_start_net_timers(struct sctp_tcb *stcb)
+{
+ uint32_t cnt_hb_sent;
+ struct sctp_nets *net;
+
+ cnt_hb_sent = 0;
+ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+ /* For each network start:
+ * 1) A pmtu timer.
+ * 2) A HB timer
+ * 3) If the dest in unconfirmed send
+ * a hb as well if under max_hb_burst have
+ * been sent.
+ */
+ sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
+ sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
+ if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
+ (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
+ sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+ cnt_hb_sent++;
+ }
+ }
+ if (cnt_hb_sent) {
+ sctp_chunk_output(stcb->sctp_ep, stcb,
+ SCTP_OUTPUT_FROM_COOKIE_ACK,
+ SCTP_SO_NOT_LOCKED);
+ }
+}
+
+
+static void
+sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
+ struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
+{
+ struct sctp_association *asoc;
+ int some_on_streamwheel;
+ int old_state;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_shutdown: handling SHUTDOWN\n");
+ if (stcb == NULL)
+ return;
+ asoc = &stcb->asoc;
+ if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
+ (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
+ return;
+ }
+ if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
+ /* Shutdown NOT the expected size */
+ return;
+ }
+ old_state = SCTP_GET_STATE(asoc);
+ sctp_update_acked(stcb, cp, abort_flag);
+ if (*abort_flag) {
+ return;
+ }
+ if (asoc->control_pdapi) {
+ /* With a normal shutdown
+ * we assume the end of last record.
+ */
+ SCTP_INP_READ_LOCK(stcb->sctp_ep);
+ if (asoc->control_pdapi->on_strm_q) {
+ struct sctp_stream_in *strm;
+
+ strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
+ if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
+ /* Unordered */
+ TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
+ asoc->control_pdapi->on_strm_q = 0;
+ } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
+ /* Ordered */
+ TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
+ asoc->control_pdapi->on_strm_q = 0;
+#ifdef INVARIANTS
+ } else {
+ panic("Unknown state on ctrl:%p on_strm_q:%d",
+ asoc->control_pdapi,
+ asoc->control_pdapi->on_strm_q);
+#endif
+ }
+ }
+ asoc->control_pdapi->end_added = 1;
+ asoc->control_pdapi->pdapi_aborted = 1;
+ asoc->control_pdapi = NULL;
+ SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ /* assoc was freed while we were unlocked */
+ SCTP_SOCKET_UNLOCK(so, 1);
+ return;
+ }
+#endif
+ if (stcb->sctp_socket) {
+ sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
+ }
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+ /* goto SHUTDOWN_RECEIVED state to block new requests */
+ if (stcb->sctp_socket) {
+ if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
+ (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
+ (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
+ SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED);
+ SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+ /* notify upper layer that peer has initiated a shutdown */
+ sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+
+ /* reset time */
+ (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
+ }
+ }
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
+ /*
+ * stop the shutdown timer, since we WILL move to
+ * SHUTDOWN-ACK-SENT.
+ */
+ sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
+ net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
+ }
+ /* Now is there unsent data on a stream somewhere? */
+ some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
+
+ if (!TAILQ_EMPTY(&asoc->send_queue) ||
+ !TAILQ_EMPTY(&asoc->sent_queue) ||
+ some_on_streamwheel) {
+ /* By returning we will push more data out */
+ return;
+ } else {
+ /* no outstanding data to send, so move on... */
+ /* send SHUTDOWN-ACK */
+ /* move to SHUTDOWN-ACK-SENT state */
+ if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
+ (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+ SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+ }
+ SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+ if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
+ sctp_stop_timers_for_shutdown(stcb);
+ sctp_send_shutdown_ack(stcb, net);
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
+ stcb->sctp_ep, stcb, net);
+ } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ sctp_send_shutdown_ack(stcb, net);
+ }
+ }
+}
+
+static void
+sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_association *asoc;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+
+ so = SCTP_INP_SO(stcb->sctp_ep);
+#endif
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
+ if (stcb == NULL)
+ return;
+
+ asoc = &stcb->asoc;
+ /* process according to association state */
+ if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) ||
+ (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) {
+ /* unexpected SHUTDOWN-ACK... do OOTB handling... */
+ sctp_send_shutdown_complete(stcb, net, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ return;
+ }
+ if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
+ (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
+ /* unexpected SHUTDOWN-ACK... so ignore... */
+ SCTP_TCB_UNLOCK(stcb);
+ return;
+ }
+ if (asoc->control_pdapi) {
+ /* With a normal shutdown
+ * we assume the end of last record.
+ */
+ SCTP_INP_READ_LOCK(stcb->sctp_ep);
+ asoc->control_pdapi->end_added = 1;
+ asoc->control_pdapi->pdapi_aborted = 1;
+ asoc->control_pdapi = NULL;
+ SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ /* assoc was freed while we were unlocked */
+ SCTP_SOCKET_UNLOCK(so, 1);
+ return;
+ }
+#endif
+ sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+#ifdef INVARIANTS
+ if (!TAILQ_EMPTY(&asoc->send_queue) ||
+ !TAILQ_EMPTY(&asoc->sent_queue) ||
+ sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
+ panic("Queues are not empty when handling SHUTDOWN-ACK");
+ }
+#endif
+ /* stop the timer */
+ sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
+ /* send SHUTDOWN-COMPLETE */
+ sctp_send_shutdown_complete(stcb, net, 0);
+ /* notify upper layer protocol */
+ if (stcb->sctp_socket) {
+ if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+ (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
+ stcb->sctp_socket->so_snd.sb_cc = 0;
+ }
+ sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ }
+ SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
+ /* free the TCB but first save off the ep */
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+}
+
+/*
+ * Skip past the param header and then we will find the chunk that caused the
+ * problem. There are two possibilities ASCONF or FWD-TSN other than that and
+ * our peer must be broken.
+ */
+static void
+sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr,
+ struct sctp_nets *net)
+{
+ struct sctp_chunkhdr *chk;
+
+ chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr));
+ switch (chk->chunk_type) {
+ case SCTP_ASCONF_ACK:
+ case SCTP_ASCONF:
+ sctp_asconf_cleanup(stcb, net);
+ break;
+ case SCTP_IFORWARD_CUM_TSN:
+ case SCTP_FORWARD_CUM_TSN:
+ stcb->asoc.prsctp_supported = 0;
+ break;
+ default:
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "Peer does not support chunk type %d(%x)??\n",
+ chk->chunk_type, (uint32_t) chk->chunk_type);
+ break;
+ }
+}
+
+/*
+ * Skip past the param header and then we will find the param that caused the
+ * problem. There are a number of param's in a ASCONF OR the prsctp param
+ * these will turn of specific features.
+ * XXX: Is this the right thing to do?
+ */
+static void
+sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr)
+{
+ struct sctp_paramhdr *pbad;
+
+ pbad = phdr + 1;
+ switch (ntohs(pbad->param_type)) {
+ /* pr-sctp draft */
+ case SCTP_PRSCTP_SUPPORTED:
+ stcb->asoc.prsctp_supported = 0;
+ break;
+ case SCTP_SUPPORTED_CHUNK_EXT:
+ break;
+ /* draft-ietf-tsvwg-addip-sctp */
+ case SCTP_HAS_NAT_SUPPORT:
+ stcb->asoc.peer_supports_nat = 0;
+ break;
+ case SCTP_ADD_IP_ADDRESS:
+ case SCTP_DEL_IP_ADDRESS:
+ case SCTP_SET_PRIM_ADDR:
+ stcb->asoc.asconf_supported = 0;
+ break;
+ case SCTP_SUCCESS_REPORT:
+ case SCTP_ERROR_CAUSE_IND:
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "Turning off ASCONF to this strange peer\n");
+ stcb->asoc.asconf_supported = 0;
+ break;
+ default:
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "Peer does not support param type %d(%x)??\n",
+ pbad->param_type, (uint32_t) pbad->param_type);
+ break;
+ }
+}
+
+static int
+sctp_handle_error(struct sctp_chunkhdr *ch,
+ struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ int chklen;
+ struct sctp_paramhdr *phdr;
+ uint16_t error, error_type;
+ uint16_t error_len;
+ struct sctp_association *asoc;
+ int adjust;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+
+ /* parse through all of the errors and process */
+ asoc = &stcb->asoc;
+ phdr = (struct sctp_paramhdr *)((caddr_t)ch +
+ sizeof(struct sctp_chunkhdr));
+ chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr);
+ error = 0;
+ while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) {
+ /* Process an Error Cause */
+ error_type = ntohs(phdr->param_type);
+ error_len = ntohs(phdr->param_length);
+ if ((error_len > chklen) || (error_len == 0)) {
+ /* invalid param length for this param */
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n",
+ chklen, error_len);
+ return (0);
+ }
+ if (error == 0) {
+ /* report the first error cause */
+ error = error_type;
+ }
+ switch (error_type) {
+ case SCTP_CAUSE_INVALID_STREAM:
+ case SCTP_CAUSE_MISSING_PARAM:
+ case SCTP_CAUSE_INVALID_PARAM:
+ case SCTP_CAUSE_NO_USER_DATA:
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n",
+ error_type);
+ break;
+ case SCTP_CAUSE_NAT_COLLIDING_STATE:
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n",
+ ch->chunk_flags);
+ if (sctp_handle_nat_colliding_state(stcb)) {
+ return (0);
+ }
+ break;
+ case SCTP_CAUSE_NAT_MISSING_STATE:
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n",
+ ch->chunk_flags);
+ if (sctp_handle_nat_missing_state(stcb, net)) {
+ return (0);
+ }
+ break;
+ case SCTP_CAUSE_STALE_COOKIE:
+ /*
+ * We only act if we have echoed a cookie and are
+ * waiting.
+ */
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
+ int *p;
+
+ p = (int *)((caddr_t)phdr + sizeof(*phdr));
+ /* Save the time doubled */
+ asoc->cookie_preserve_req = ntohl(*p) << 1;
+ asoc->stale_cookie_count++;
+ if (asoc->stale_cookie_count >
+ asoc->max_init_times) {
+ sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED);
+ /* now free the asoc */
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ return (-1);
+ }
+ /* blast back to INIT state */
+ sctp_toss_old_cookies(stcb, &stcb->asoc);
+ asoc->state &= ~SCTP_STATE_COOKIE_ECHOED;
+ asoc->state |= SCTP_STATE_COOKIE_WAIT;
+ sctp_stop_all_cookie_timers(stcb);
+ sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+ }
+ break;
+ case SCTP_CAUSE_UNRESOLVABLE_ADDR:
+ /*
+ * Nothing we can do here, we don't do hostname
+ * addresses so if the peer does not like my IPv6
+ * (or IPv4 for that matter) it does not matter. If
+ * they don't support that type of address, they can
+ * NOT possibly get that packet type... i.e. with no
+ * IPv6 you can't receive a IPv6 packet. so we can
+ * safely ignore this one. If we ever added support
+ * for HOSTNAME Addresses, then we would need to do
+ * something here.
+ */
+ break;
+ case SCTP_CAUSE_UNRECOG_CHUNK:
+ sctp_process_unrecog_chunk(stcb, phdr, net);
+ break;
+ case SCTP_CAUSE_UNRECOG_PARAM:
+ sctp_process_unrecog_param(stcb, phdr);
+ break;
+ case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
+ /*
+ * We ignore this since the timer will drive out a
+ * new cookie anyway and there timer will drive us
+ * to send a SHUTDOWN_COMPLETE. We can't send one
+ * here since we don't have their tag.
+ */
+ break;
+ case SCTP_CAUSE_DELETING_LAST_ADDR:
+ case SCTP_CAUSE_RESOURCE_SHORTAGE:
+ case SCTP_CAUSE_DELETING_SRC_ADDR:
+ /*
+ * We should NOT get these here, but in a
+ * ASCONF-ACK.
+ */
+ SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n",
+ error_type);
+ break;
+ case SCTP_CAUSE_OUT_OF_RESC:
+ /*
+ * And what, pray tell do we do with the fact that
+ * the peer is out of resources? Not really sure we
+ * could do anything but abort. I suspect this
+ * should have came WITH an abort instead of in a
+ * OP-ERROR.
+ */
+ break;
+ default:
+ SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n",
+ error_type);
+ break;
+ }
+ adjust = SCTP_SIZE32(error_len);
+ chklen -= adjust;
+ phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust);
+ }
+ sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED);
+ return (0);
+}
+
+static int
+sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+ struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
+ struct sctp_nets *net, int *abort_no_unlock,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id)
+{
+ struct sctp_init_ack *init_ack;
+ struct mbuf *op_err;
+
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_init_ack: handling INIT-ACK\n");
+
+ if (stcb == NULL) {
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_init_ack: TCB is null\n");
+ return (-1);
+ }
+ if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) {
+ /* Invalid length */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ init_ack = &cp->init;
+ /* validate parameters */
+ if (init_ack->initiate_tag == 0) {
+ /* protocol error... send an abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) {
+ /* protocol error... send an abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ if (init_ack->num_inbound_streams == 0) {
+ /* protocol error... send an abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ if (init_ack->num_outbound_streams == 0) {
+ /* protocol error... send an abort */
+ op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+ sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, net->port);
+ *abort_no_unlock = 1;
+ return (-1);
+ }
+ /* process according to association state... */
+ switch (stcb->asoc.state & SCTP_STATE_MASK) {
+ case SCTP_STATE_COOKIE_WAIT:
+ /* this is the expected state for this chunk */
+ /* process the INIT-ACK parameters */
+ if (stcb->asoc.primary_destination->dest_state &
+ SCTP_ADDR_UNCONFIRMED) {
+ /*
+ * The primary is where we sent the INIT, we can
+ * always consider it confirmed when the INIT-ACK is
+ * returned. Do this before we load addresses
+ * though.
+ */
+ stcb->asoc.primary_destination->dest_state &=
+ ~SCTP_ADDR_UNCONFIRMED;
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+ stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
+ }
+ if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
+ net, abort_no_unlock,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id) < 0) {
+ /* error in parsing parameters */
+ return (-1);
+ }
+ /* update our state */
+ SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
+ SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED);
+
+ /* reset the RTO calc */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
+ /*
+ * collapse the init timer back in case of a exponential
+ * backoff
+ */
+ sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
+ stcb, net);
+ /*
+ * the send at the end of the inbound data processing will
+ * cause the cookie to be sent
+ */
+ break;
+ case SCTP_STATE_SHUTDOWN_SENT:
+ /* incorrect state... discard */
+ break;
+ case SCTP_STATE_COOKIE_ECHOED:
+ /* incorrect state... discard */
+ break;
+ case SCTP_STATE_OPEN:
+ /* incorrect state... discard */
+ break;
+ case SCTP_STATE_EMPTY:
+ case SCTP_STATE_INUSE:
+ default:
+ /* incorrect state... discard */
+ return (-1);
+ break;
+ }
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
+ return (0);
+}
+
+static struct sctp_tcb *
+sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+ struct sctp_inpcb *inp, struct sctp_nets **netp,
+ struct sockaddr *init_src, int *notification,
+ int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id, uint16_t port);
+
+
+/*
+ * handle a state cookie for an existing association m: input packet mbuf
+ * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
+ * "split" mbuf and the cookie signature does not exist offset: offset into
+ * mbuf to the cookie-echo chunk
+ */
+static struct sctp_tcb *
+sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+ struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
+ struct sockaddr *init_src, int *notification,
+ int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ struct sctp_association *asoc;
+ struct sctp_init_chunk *init_cp, init_buf;
+ struct sctp_init_ack_chunk *initack_cp, initack_buf;
+ struct sctp_nets *net;
+ struct mbuf *op_err;
+ int init_offset, initack_offset, i;
+ int retval;
+ int spec_flag = 0;
+ uint32_t how_indx;
+#if defined(SCTP_DETAILED_STR_STATS)
+ int j;
+#endif
+
+ net = *netp;
+ /* I know that the TCB is non-NULL from the caller */
+ asoc = &stcb->asoc;
+ for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) {
+ if (asoc->cookie_how[how_indx] == 0)
+ break;
+ }
+ if (how_indx < sizeof(asoc->cookie_how)) {
+ asoc->cookie_how[how_indx] = 1;
+ }
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ /* SHUTDOWN came in after sending INIT-ACK */
+ sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
+ op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
+ sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, net->port);
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 2;
+ return (NULL);
+ }
+ /*
+ * find and validate the INIT chunk in the cookie (peer's info) the
+ * INIT should start after the cookie-echo header struct (chunk
+ * header, state cookie header struct)
+ */
+ init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
+
+ init_cp = (struct sctp_init_chunk *)
+ sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
+ (uint8_t *) & init_buf);
+ if (init_cp == NULL) {
+ /* could not pull a INIT chunk in cookie */
+ return (NULL);
+ }
+ if (init_cp->ch.chunk_type != SCTP_INITIATION) {
+ return (NULL);
+ }
+ /*
+ * find and validate the INIT-ACK chunk in the cookie (my info) the
+ * INIT-ACK follows the INIT chunk
+ */
+ initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
+ initack_cp = (struct sctp_init_ack_chunk *)
+ sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
+ (uint8_t *) & initack_buf);
+ if (initack_cp == NULL) {
+ /* could not pull INIT-ACK chunk in cookie */
+ return (NULL);
+ }
+ if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
+ return (NULL);
+ }
+ if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+ (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
+ /*
+ * case D in Section 5.2.4 Table 2: MMAA process accordingly
+ * to get into the OPEN state
+ */
+ if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
+ /*-
+ * Opps, this means that we somehow generated two vtag's
+ * the same. I.e. we did:
+ * Us Peer
+ * <---INIT(tag=a)------
+ * ----INIT-ACK(tag=t)-->
+ * ----INIT(tag=t)------> *1
+ * <---INIT-ACK(tag=a)---
+ * <----CE(tag=t)------------- *2
+ *
+ * At point *1 we should be generating a different
+ * tag t'. Which means we would throw away the CE and send
+ * ours instead. Basically this is case C (throw away side).
+ */
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 17;
+ return (NULL);
+
+ }
+ switch (SCTP_GET_STATE(asoc)) {
+ case SCTP_STATE_COOKIE_WAIT:
+ case SCTP_STATE_COOKIE_ECHOED:
+ /*
+ * INIT was sent but got a COOKIE_ECHO with the
+ * correct tags... just accept it...but we must
+ * process the init so that we can make sure we
+ * have the right seq no's.
+ */
+ /* First we must process the INIT !! */
+ retval = sctp_process_init(init_cp, stcb);
+ if (retval < 0) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 3;
+ return (NULL);
+ }
+ /* we have already processed the INIT so no problem */
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
+ stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
+ sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
+ stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
+ /* update current state */
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
+ SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+ else
+ SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb, asoc->primary_destination);
+ }
+ SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+ sctp_stop_all_cookie_timers(stcb);
+ if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+ (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+ (inp->sctp_socket->so_qlimit == 0)
+ ) {
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+ /*
+ * Here is where collision would go if we
+ * did a connect() and instead got a
+ * init/init-ack/cookie done before the
+ * init-ack came back..
+ */
+ stcb->sctp_ep->sctp_flags |=
+ SCTP_PCB_FLAGS_CONNECTED;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_add_int(&stcb->asoc.refcnt, -1);
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ SCTP_SOCKET_UNLOCK(so, 1);
+ return (NULL);
+ }
+#endif
+ soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+ /* notify upper layer */
+ *notification = SCTP_NOTIFY_ASSOC_UP;
+ /*
+ * since we did not send a HB make sure we
+ * don't double things
+ */
+ net->hb_responded = 1;
+ net->RTO = sctp_calculate_rto(stcb, asoc, net,
+ &cookie->time_entered,
+ sctp_align_unsafe_makecopy,
+ SCTP_RTT_FROM_NON_DATA);
+
+ if (stcb->asoc.sctp_autoclose_ticks &&
+ (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
+ sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
+ inp, stcb, NULL);
+ }
+ break;
+ default:
+ /*
+ * we're in the OPEN state (or beyond), so
+ * peer must have simply lost the COOKIE-ACK
+ */
+ break;
+ } /* end switch */
+ sctp_stop_all_cookie_timers(stcb);
+ /*
+ * We ignore the return code here.. not sure if we should
+ * somehow abort.. but we do have an existing asoc. This
+ * really should not fail.
+ */
+ if (sctp_load_addresses_from_init(stcb, m,
+ init_offset + sizeof(struct sctp_init_chunk),
+ initack_offset, src, dst, init_src, stcb->asoc.port)) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 4;
+ return (NULL);
+ }
+ /* respond with a COOKIE-ACK */
+ sctp_toss_old_cookies(stcb, asoc);
+ sctp_send_cookie_ack(stcb);
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 5;
+ return (stcb);
+ }
+
+ if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
+ ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
+ cookie->tie_tag_my_vtag == 0 &&
+ cookie->tie_tag_peer_vtag == 0) {
+ /*
+ * case C in Section 5.2.4 Table 2: XMOO silently discard
+ */
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 6;
+ return (NULL);
+ }
+ /* If nat support, and the below and stcb is established,
+ * send back a ABORT(colliding state) if we are established.
+ */
+ if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) &&
+ (asoc->peer_supports_nat) &&
+ ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+ ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
+ (asoc->peer_vtag == 0)))) {
+ /* Special case - Peer's support nat. We may have
+ * two init's that we gave out the same tag on since
+ * one was not established.. i.e. we get INIT from host-1
+ * behind the nat and we respond tag-a, we get a INIT from
+ * host-2 behind the nat and we get tag-a again. Then we
+ * bring up host-1 (or 2's) assoc, Then comes the cookie
+ * from hsot-2 (or 1). Now we have colliding state. We must
+ * send an abort here with colliding state indication.
+ */
+ op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
+ sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, port);
+ return (NULL);
+ }
+ if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+ ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
+ (asoc->peer_vtag == 0))) {
+ /*
+ * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
+ * should be ok, re-accept peer info
+ */
+ if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
+ /* Extension of case C.
+ * If we hit this, then the random number
+ * generator returned the same vtag when we
+ * first sent our INIT-ACK and when we later sent
+ * our INIT. The side with the seq numbers that are
+ * different will be the one that normnally would
+ * have hit case C. This in effect "extends" our vtags
+ * in this collision case to be 64 bits. The same collision
+ * could occur aka you get both vtag and seq number the
+ * same twice in a row.. but is much less likely. If it
+ * did happen then we would proceed through and bring
+ * up the assoc.. we may end up with the wrong stream
+ * setup however.. which would be bad.. but there is
+ * no way to tell.. until we send on a stream that does
+ * not exist :-)
+ */
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 7;
+
+ return (NULL);
+ }
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 8;
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
+ sctp_stop_all_cookie_timers(stcb);
+ /*
+ * since we did not send a HB make sure we don't double
+ * things
+ */
+ net->hb_responded = 1;
+ if (stcb->asoc.sctp_autoclose_ticks &&
+ sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+ sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
+ NULL);
+ }
+ asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+ asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
+
+ if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
+ /* Ok the peer probably discarded our
+ * data (if we echoed a cookie+data). So anything
+ * on the sent_queue should be marked for
+ * retransmit, we may not get something to
+ * kick us so it COULD still take a timeout
+ * to move these.. but it can't hurt to mark them.
+ */
+ struct sctp_tmit_chunk *chk;
+ TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
+ if (chk->sent < SCTP_DATAGRAM_RESEND) {
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ sctp_flight_size_decrease(chk);
+ sctp_total_flight_decrease(stcb, chk);
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ spec_flag++;
+ }
+ }
+
+ }
+ /* process the INIT info (peer's info) */
+ retval = sctp_process_init(init_cp, stcb);
+ if (retval < 0) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 9;
+ return (NULL);
+ }
+ if (sctp_load_addresses_from_init(stcb, m,
+ init_offset + sizeof(struct sctp_init_chunk),
+ initack_offset, src, dst, init_src, stcb->asoc.port)) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 10;
+ return (NULL);
+ }
+ if ((asoc->state & SCTP_STATE_COOKIE_WAIT) ||
+ (asoc->state & SCTP_STATE_COOKIE_ECHOED)) {
+ *notification = SCTP_NOTIFY_ASSOC_UP;
+
+ if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+ (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+ (inp->sctp_socket->so_qlimit == 0)) {
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+ stcb->sctp_ep->sctp_flags |=
+ SCTP_PCB_FLAGS_CONNECTED;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_add_int(&stcb->asoc.refcnt, -1);
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ SCTP_SOCKET_UNLOCK(so, 1);
+ return (NULL);
+ }
+#endif
+ soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)
+ SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+ else
+ SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+ SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+ } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
+ SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
+ } else {
+ SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+ }
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb, asoc->primary_destination);
+ }
+ sctp_stop_all_cookie_timers(stcb);
+ sctp_toss_old_cookies(stcb, asoc);
+ sctp_send_cookie_ack(stcb);
+ if (spec_flag) {
+ /* only if we have retrans set do we do this. What
+ * this call does is get only the COOKIE-ACK out
+ * and then when we return the normal call to
+ * sctp_chunk_output will get the retrans out
+ * behind this.
+ */
+ sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
+ }
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 11;
+
+ return (stcb);
+ }
+ if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
+ ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
+ cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
+ cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
+ cookie->tie_tag_peer_vtag != 0) {
+ struct sctpasochead *head;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+
+ if (asoc->peer_supports_nat) {
+ /* This is a gross gross hack.
+ * Just call the cookie_new code since we
+ * are allowing a duplicate association.
+ * I hope this works...
+ */
+ return (sctp_process_cookie_new(m, iphlen, offset, src, dst,
+ sh, cookie, cookie_len,
+ inp, netp, init_src,notification,
+ auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port));
+ }
+ /*
+ * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
+ */
+ /* temp code */
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 12;
+ sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_16);
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_17);
+
+ /* notify upper layer */
+ *notification = SCTP_NOTIFY_ASSOC_RESTART;
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) &&
+ (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
+ (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) {
+ SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+ }
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) {
+ SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
+ } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
+ SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
+ }
+ if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb, asoc->primary_destination);
+
+ } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) {
+ /* move to OPEN state, if not in SHUTDOWN_SENT */
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ }
+ asoc->pre_open_streams =
+ ntohs(initack_cp->init.num_outbound_streams);
+ asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
+ asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
+ asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
+
+ asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
+
+ asoc->str_reset_seq_in = asoc->init_seq_number;
+
+ asoc->advanced_peer_ack_point = asoc->last_acked_seq;
+ if (asoc->mapping_array) {
+ memset(asoc->mapping_array, 0,
+ asoc->mapping_array_size);
+ }
+ if (asoc->nr_mapping_array) {
+ memset(asoc->nr_mapping_array, 0,
+ asoc->mapping_array_size);
+ }
+ SCTP_TCB_UNLOCK(stcb);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ SCTP_SOCKET_LOCK(so, 1);
+#endif
+ SCTP_INP_INFO_WLOCK();
+ SCTP_INP_WLOCK(stcb->sctp_ep);
+ SCTP_TCB_LOCK(stcb);
+ atomic_add_int(&stcb->asoc.refcnt, -1);
+ /* send up all the data */
+ SCTP_TCB_SEND_LOCK(stcb);
+
+ sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED);
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ stcb->asoc.strmout[i].chunks_on_queues = 0;
+#if defined(SCTP_DETAILED_STR_STATS)
+ for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
+ asoc->strmout[i].abandoned_sent[j] = 0;
+ asoc->strmout[i].abandoned_unsent[j] = 0;
+ }
+#else
+ asoc->strmout[i].abandoned_sent[0] = 0;
+ asoc->strmout[i].abandoned_unsent[0] = 0;
+#endif
+ stcb->asoc.strmout[i].sid = i;
+ stcb->asoc.strmout[i].next_mid_ordered = 0;
+ stcb->asoc.strmout[i].next_mid_unordered = 0;
+ stcb->asoc.strmout[i].last_msg_incomplete = 0;
+ }
+ /* process the INIT-ACK info (my info) */
+ asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
+ asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+
+ /* pull from vtag hash */
+ LIST_REMOVE(stcb, sctp_asocs);
+ /* re-insert to new vtag position */
+ head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
+ SCTP_BASE_INFO(hashasocmark))];
+ /*
+ * put it in the bucket in the vtag hash of assoc's for the
+ * system
+ */
+ LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+
+ SCTP_TCB_SEND_UNLOCK(stcb);
+ SCTP_INP_WUNLOCK(stcb->sctp_ep);
+ SCTP_INP_INFO_WUNLOCK();
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ asoc->total_flight = 0;
+ asoc->total_flight_count = 0;
+ /* process the INIT info (peer's info) */
+ retval = sctp_process_init(init_cp, stcb);
+ if (retval < 0) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 13;
+
+ return (NULL);
+ }
+ /*
+ * since we did not send a HB make sure we don't double
+ * things
+ */
+ net->hb_responded = 1;
+
+ if (sctp_load_addresses_from_init(stcb, m,
+ init_offset + sizeof(struct sctp_init_chunk),
+ initack_offset, src, dst, init_src, stcb->asoc.port)) {
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 14;
+
+ return (NULL);
+ }
+ /* respond with a COOKIE-ACK */
+ sctp_stop_all_cookie_timers(stcb);
+ sctp_toss_old_cookies(stcb, asoc);
+ sctp_send_cookie_ack(stcb);
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 15;
+
+ return (stcb);
+ }
+ if (how_indx < sizeof(asoc->cookie_how))
+ asoc->cookie_how[how_indx] = 16;
+ /* all other cases... */
+ return (NULL);
+}
+
+
+/*
+ * handle a state cookie for a new association m: input packet mbuf chain--
+ * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
+ * and the cookie signature does not exist offset: offset into mbuf to the
+ * cookie-echo chunk length: length of the cookie chunk to: where the init
+ * was from returns a new TCB
+ */
+static struct sctp_tcb *
+sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+ struct sctp_inpcb *inp, struct sctp_nets **netp,
+ struct sockaddr *init_src, int *notification,
+ int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ struct sctp_tcb *stcb;
+ struct sctp_init_chunk *init_cp, init_buf;
+ struct sctp_init_ack_chunk *initack_cp, initack_buf;
+ union sctp_sockstore store;
+ struct sctp_association *asoc;
+ int init_offset, initack_offset, initack_limit;
+ int retval;
+ int error = 0;
+ uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE];
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+
+ so = SCTP_INP_SO(inp);
+#endif
+
+ /*
+ * find and validate the INIT chunk in the cookie (peer's info) the
+ * INIT should start after the cookie-echo header struct (chunk
+ * header, state cookie header struct)
+ */
+ init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
+ init_cp = (struct sctp_init_chunk *)
+ sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
+ (uint8_t *) & init_buf);
+ if (init_cp == NULL) {
+ /* could not pull a INIT chunk in cookie */
+ SCTPDBG(SCTP_DEBUG_INPUT1,
+ "process_cookie_new: could not pull INIT chunk hdr\n");
+ return (NULL);
+ }
+ if (init_cp->ch.chunk_type != SCTP_INITIATION) {
+ SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
+ return (NULL);
+ }
+ initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
+ /*
+ * find and validate the INIT-ACK chunk in the cookie (my info) the
+ * INIT-ACK follows the INIT chunk
+ */
+ initack_cp = (struct sctp_init_ack_chunk *)
+ sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
+ (uint8_t *) & initack_buf);
+ if (initack_cp == NULL) {
+ /* could not pull INIT-ACK chunk in cookie */
+ SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
+ return (NULL);
+ }
+ if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
+ return (NULL);
+ }
+ /*
+ * NOTE: We can't use the INIT_ACK's chk_length to determine the
+ * "initack_limit" value. This is because the chk_length field
+ * includes the length of the cookie, but the cookie is omitted when
+ * the INIT and INIT_ACK are tacked onto the cookie...
+ */
+ initack_limit = offset + cookie_len;
+
+ /*
+ * now that we know the INIT/INIT-ACK are in place, create a new TCB
+ * and popluate
+ */
+
+ /*
+ * Here we do a trick, we set in NULL for the proc/thread argument. We
+ * do this since in effect we only use the p argument when
+ * the socket is unbound and we must do an implicit bind.
+ * Since we are getting a cookie, we cannot be unbound.
+ */
+ stcb = sctp_aloc_assoc(inp, init_src, &error,
+ ntohl(initack_cp->init.initiate_tag), vrf_id,
+ ntohs(initack_cp->init.num_outbound_streams),
+ port,
+#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
+ (struct thread *)NULL
+#elif defined(__Windows__)
+ (PKTHREAD)NULL
+#else
+ (struct proc *)NULL
+#endif
+ );
+ if (stcb == NULL) {
+ struct mbuf *op_err;
+
+ /* memory problem? */
+ SCTPDBG(SCTP_DEBUG_INPUT1,
+ "process_cookie_new: no room for another TCB!\n");
+ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+ sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ return (NULL);
+ }
+ /* get the correct sctp_nets */
+ if (netp)
+ *netp = sctp_findnet(stcb, init_src);
+
+ asoc = &stcb->asoc;
+ /* get scope variables out of cookie */
+ asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
+ asoc->scope.site_scope = cookie->site_scope;
+ asoc->scope.local_scope = cookie->local_scope;
+ asoc->scope.loopback_scope = cookie->loopback_scope;
+
+#if defined(__Userspace__)
+ if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
+ (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
+ (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
+#else
+ if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
+ (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
+#endif
+ struct mbuf *op_err;
+
+ /*
+ * Houston we have a problem. The EP changed while the
+ * cookie was in flight. Only recourse is to abort the
+ * association.
+ */
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+ sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ return (NULL);
+ }
+ /* process the INIT-ACK info (my info) */
+ asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
+ asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+ asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams);
+ asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
+ asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
+ asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
+ asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
+ asoc->str_reset_seq_in = asoc->init_seq_number;
+
+ asoc->advanced_peer_ack_point = asoc->last_acked_seq;
+
+ /* process the INIT info (peer's info) */
+ if (netp)
+ retval = sctp_process_init(init_cp, stcb);
+ else
+ retval = 0;
+ if (retval < 0) {
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ return (NULL);
+ }
+ /* load all addresses */
+ if (sctp_load_addresses_from_init(stcb, m,
+ init_offset + sizeof(struct sctp_init_chunk), initack_offset,
+ src, dst, init_src, port)) {
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ return (NULL);
+ }
+ /*
+ * verify any preceding AUTH chunk that was skipped
+ */
+ /* pull the local authentication parameters from the cookie/init-ack */
+ sctp_auth_get_cookie_params(stcb, m,
+ initack_offset + sizeof(struct sctp_init_ack_chunk),
+ initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
+ if (auth_skipped) {
+ struct sctp_auth_chunk *auth;
+
+ auth = (struct sctp_auth_chunk *)
+ sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
+ if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
+ /* auth HMAC failed, dump the assoc and packet */
+ SCTPDBG(SCTP_DEBUG_AUTH1,
+ "COOKIE-ECHO: AUTH failed\n");
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ return (NULL);
+ } else {
+ /* remaining chunks checked... good to go */
+ stcb->asoc.authenticated = 1;
+ }
+ }
+ /* update current state */
+ SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb, asoc->primary_destination);
+ }
+ sctp_stop_all_cookie_timers(stcb);
+ SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
+ SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+
+ /*
+ * if we're doing ASCONFs, check to see if we have any new local
+ * addresses that need to get added to the peer (eg. addresses
+ * changed while cookie echo in flight). This needs to be done
+ * after we go to the OPEN state to do the correct asconf
+ * processing. else, make sure we have the correct addresses in our
+ * lists
+ */
+
+ /* warning, we re-use sin, sin6, sa_store here! */
+ /* pull in local_address (our "from" address) */
+ switch (cookie->laddr_type) {
+#ifdef INET
+ case SCTP_IPV4_ADDRESS:
+ /* source addr is IPv4 */
+ memset(&store.sin, 0, sizeof(struct sockaddr_in));
+ store.sin.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+ store.sin.sin_len = sizeof(struct sockaddr_in);
+#endif
+ store.sin.sin_addr.s_addr = cookie->laddress[0];
+ break;
+#endif
+#ifdef INET6
+ case SCTP_IPV6_ADDRESS:
+ /* source addr is IPv6 */
+ memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
+ store.sin6.sin6_family = AF_INET6;
+#ifdef HAVE_SIN6_LEN
+ store.sin6.sin6_len = sizeof(struct sockaddr_in6);
+#endif
+ store.sin6.sin6_scope_id = cookie->scope_id;
+ memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
+ break;
+#endif
+#if defined(__Userspace__)
+ case SCTP_CONN_ADDRESS:
+ /* source addr is conn */
+ memset(&store.sconn, 0, sizeof(struct sockaddr_conn));
+ store.sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+ store.sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+ memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *));
+ break;
+#endif
+ default:
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ return (NULL);
+ }
+
+ /* set up to notify upper layer */
+ *notification = SCTP_NOTIFY_ASSOC_UP;
+ if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+ (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+ (inp->sctp_socket->so_qlimit == 0)) {
+ /*
+ * This is an endpoint that called connect() how it got a
+ * cookie that is NEW is a bit of a mystery. It must be that
+ * the INIT was sent, but before it got there.. a complete
+ * INIT/INIT-ACK/COOKIE arrived. But of course then it
+ * should have went to the other code.. not here.. oh well..
+ * a bit of protection is worth having..
+ */
+ stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ SCTP_SOCKET_UNLOCK(so, 1);
+ return (NULL);
+ }
+#endif
+ soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
+ (inp->sctp_socket->so_qlimit)) {
+ /*
+ * We don't want to do anything with this one. Since it is
+ * the listening guy. The timer will get started for
+ * accepted connections in the caller.
+ */
+ ;
+ }
+ /* since we did not send a HB make sure we don't double things */
+ if ((netp) && (*netp))
+ (*netp)->hb_responded = 1;
+
+ if (stcb->asoc.sctp_autoclose_ticks &&
+ sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+ sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
+ }
+ (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
+ if ((netp != NULL) && (*netp != NULL)) {
+ /* calculate the RTT and set the encaps port */
+ (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp,
+ &cookie->time_entered, sctp_align_unsafe_makecopy,
+ SCTP_RTT_FROM_NON_DATA);
+ }
+ /* respond with a COOKIE-ACK */
+ sctp_send_cookie_ack(stcb);
+
+ /*
+ * check the address lists for any ASCONFs that need to be sent
+ * AFTER the cookie-ack is sent
+ */
+ sctp_check_address_list(stcb, m,
+ initack_offset + sizeof(struct sctp_init_ack_chunk),
+ initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
+ &store.sa, cookie->local_scope, cookie->site_scope,
+ cookie->ipv4_scope, cookie->loopback_scope);
+
+
+ return (stcb);
+}
+
+/*
+ * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
+ * we NEED to make sure we are not already using the vtag. If so we
+ * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
+ head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
+ SCTP_BASE_INFO(hashasocmark))];
+ LIST_FOREACH(stcb, head, sctp_asocs) {
+ if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
+ -- SEND ABORT - TRY AGAIN --
+ }
+ }
+*/
+
+/*
+ * handles a COOKIE-ECHO message stcb: modified to either a new or left as
+ * existing (non-NULL) TCB
+ */
+static struct mbuf *
+sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
+ struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
+ int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+ struct sctp_tcb **locked_tcb,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ struct sctp_state_cookie *cookie;
+ struct sctp_tcb *l_stcb = *stcb;
+ struct sctp_inpcb *l_inp;
+ struct sockaddr *to;
+ struct sctp_pcb *ep;
+ struct mbuf *m_sig;
+ uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
+ uint8_t *sig;
+ uint8_t cookie_ok = 0;
+ unsigned int sig_offset, cookie_offset;
+ unsigned int cookie_len;
+ struct timeval now;
+ struct timeval time_expires;
+ int notification = 0;
+ struct sctp_nets *netl;
+ int had_a_existing_tcb = 0;
+ int send_int_conf = 0;
+#ifdef INET
+ struct sockaddr_in sin;
+#endif
+#ifdef INET6
+ struct sockaddr_in6 sin6;
+#endif
+#if defined(__Userspace__)
+ struct sockaddr_conn sconn;
+#endif
+
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_cookie: handling COOKIE-ECHO\n");
+
+ if (inp_p == NULL) {
+ return (NULL);
+ }
+ cookie = &cp->cookie;
+ cookie_offset = offset + sizeof(struct sctp_chunkhdr);
+ cookie_len = ntohs(cp->ch.chunk_length);
+
+ if ((cookie->peerport != sh->src_port) ||
+ (cookie->myport != sh->dest_port) ||
+ (cookie->my_vtag != sh->v_tag)) {
+ /*
+ * invalid ports or bad tag. Note that we always leave the
+ * v_tag in the header in network order and when we stored
+ * it in the my_vtag slot we also left it in network order.
+ * This maintains the match even though it may be in the
+ * opposite byte order of the machine :->
+ */
+ return (NULL);
+ }
+ if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
+ sizeof(struct sctp_init_chunk) +
+ sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
+ /* cookie too small */
+ return (NULL);
+ }
+ /*
+ * split off the signature into its own mbuf (since it should not be
+ * calculated in the sctp_hmac_m() call).
+ */
+ sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
+ m_sig = m_split(m, sig_offset, M_NOWAIT);
+ if (m_sig == NULL) {
+ /* out of memory or ?? */
+ return (NULL);
+ }
+#ifdef SCTP_MBUF_LOGGING
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+ sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
+ }
+#endif
+
+ /*
+ * compute the signature/digest for the cookie
+ */
+ ep = &(*inp_p)->sctp_ep;
+ l_inp = *inp_p;
+ if (l_stcb) {
+ SCTP_TCB_UNLOCK(l_stcb);
+ }
+ SCTP_INP_RLOCK(l_inp);
+ if (l_stcb) {
+ SCTP_TCB_LOCK(l_stcb);
+ }
+ /* which cookie is it? */
+ if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
+ (ep->current_secret_number != ep->last_secret_number)) {
+ /* it's the old cookie */
+ (void)sctp_hmac_m(SCTP_HMAC,
+ (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
+ SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+ } else {
+ /* it's the current cookie */
+ (void)sctp_hmac_m(SCTP_HMAC,
+ (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
+ SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+ }
+ /* get the signature */
+ SCTP_INP_RUNLOCK(l_inp);
+ sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
+ if (sig == NULL) {
+ /* couldn't find signature */
+ sctp_m_freem(m_sig);
+ return (NULL);
+ }
+ /* compare the received digest with the computed digest */
+ if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
+ /* try the old cookie? */
+ if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
+ (ep->current_secret_number != ep->last_secret_number)) {
+ /* compute digest with old */
+ (void)sctp_hmac_m(SCTP_HMAC,
+ (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
+ SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+ /* compare */
+ if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
+ cookie_ok = 1;
+ }
+ } else {
+ cookie_ok = 1;
+ }
+
+ /*
+ * Now before we continue we must reconstruct our mbuf so that
+ * normal processing of any other chunks will work.
+ */
+ {
+ struct mbuf *m_at;
+
+ m_at = m;
+ while (SCTP_BUF_NEXT(m_at) != NULL) {
+ m_at = SCTP_BUF_NEXT(m_at);
+ }
+ SCTP_BUF_NEXT(m_at) = m_sig;
+ }
+
+ if (cookie_ok == 0) {
+ SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "offset = %u, cookie_offset = %u, sig_offset = %u\n",
+ (uint32_t) offset, cookie_offset, sig_offset);
+ return (NULL);
+ }
+
+ /*
+ * check the cookie timestamps to be sure it's not stale
+ */
+ (void)SCTP_GETTIME_TIMEVAL(&now);
+ /* Expire time is in Ticks, so we convert to seconds */
+ time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life);
+ time_expires.tv_usec = cookie->time_entered.tv_usec;
+ /* TODO sctp_constants.h needs alternative time macros when
+ * _KERNEL is undefined.
+ */
+#ifndef __FreeBSD__
+ if (timercmp(&now, &time_expires, >))
+#else
+ if (timevalcmp(&now, &time_expires, >))
+#endif
+ {
+ /* cookie is stale! */
+ struct mbuf *op_err;
+ struct sctp_error_stale_cookie *cause;
+ uint32_t tim;
+ op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
+ 0, M_NOWAIT, 1, MT_DATA);
+ if (op_err == NULL) {
+ /* FOOBAR */
+ return (NULL);
+ }
+ /* Set the len */
+ SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
+ cause = mtod(op_err, struct sctp_error_stale_cookie *);
+ cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
+ cause->cause.length = htons((sizeof(struct sctp_paramhdr) +
+ (sizeof(uint32_t))));
+ /* seconds to usec */
+ tim = (now.tv_sec - time_expires.tv_sec) * 1000000;
+ /* add in usec */
+ if (tim == 0)
+ tim = now.tv_usec - cookie->time_entered.tv_usec;
+ cause->stale_time = htonl(tim);
+ sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, l_inp->fibnum,
+#endif
+ vrf_id, port);
+ return (NULL);
+ }
+ /*
+ * Now we must see with the lookup address if we have an existing
+ * asoc. This will only happen if we were in the COOKIE-WAIT state
+ * and a INIT collided with us and somewhere the peer sent the
+ * cookie on another address besides the single address our assoc
+ * had for him. In this case we will have one of the tie-tags set at
+ * least AND the address field in the cookie can be used to look it
+ * up.
+ */
+ to = NULL;
+ switch (cookie->addr_type) {
+#ifdef INET6
+ case SCTP_IPV6_ADDRESS:
+ memset(&sin6, 0, sizeof(sin6));
+ sin6.sin6_family = AF_INET6;
+#ifdef HAVE_SIN6_LEN
+ sin6.sin6_len = sizeof(sin6);
+#endif
+ sin6.sin6_port = sh->src_port;
+ sin6.sin6_scope_id = cookie->scope_id;
+ memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
+ sizeof(sin6.sin6_addr.s6_addr));
+ to = (struct sockaddr *)&sin6;
+ break;
+#endif
+#ifdef INET
+ case SCTP_IPV4_ADDRESS:
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+ sin.sin_len = sizeof(sin);
+#endif
+ sin.sin_port = sh->src_port;
+ sin.sin_addr.s_addr = cookie->address[0];
+ to = (struct sockaddr *)&sin;
+ break;
+#endif
+#if defined(__Userspace__)
+ case SCTP_CONN_ADDRESS:
+ memset(&sconn, 0, sizeof(struct sockaddr_conn));
+ sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+ sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+ sconn.sconn_port = sh->src_port;
+ memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
+ to = (struct sockaddr *)&sconn;
+ break;
+#endif
+ default:
+ /* This should not happen */
+ return (NULL);
+ }
+ if (*stcb == NULL) {
+ /* Yep, lets check */
+ *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
+ if (*stcb == NULL) {
+ /*
+ * We should have only got back the same inp. If we
+ * got back a different ep we have a problem. The
+ * original findep got back l_inp and now
+ */
+ if (l_inp != *inp_p) {
+ SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
+ }
+ } else {
+ if (*locked_tcb == NULL) {
+ /* In this case we found the assoc only
+ * after we locked the create lock. This means
+ * we are in a colliding case and we must make
+ * sure that we unlock the tcb if its one of the
+ * cases where we throw away the incoming packets.
+ */
+ *locked_tcb = *stcb;
+
+ /* We must also increment the inp ref count
+ * since the ref_count flags was set when we
+ * did not find the TCB, now we found it which
+ * reduces the refcount.. we must raise it back
+ * out to balance it all :-)
+ */
+ SCTP_INP_INCR_REF((*stcb)->sctp_ep);
+ if ((*stcb)->sctp_ep != l_inp) {
+ SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
+ (void *)(*stcb)->sctp_ep, (void *)l_inp);
+ }
+ }
+ }
+ }
+
+ cookie_len -= SCTP_SIGNATURE_SIZE;
+ if (*stcb == NULL) {
+ /* this is the "normal" case... get a new TCB */
+ *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
+ cookie, cookie_len, *inp_p,
+ netp, to, ¬ification,
+ auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ } else {
+ /* this is abnormal... cookie-echo on existing TCB */
+ had_a_existing_tcb = 1;
+ *stcb = sctp_process_cookie_existing(m, iphlen, offset,
+ src, dst, sh,
+ cookie, cookie_len, *inp_p, *stcb, netp, to,
+ ¬ification, auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ }
+
+ if (*stcb == NULL) {
+ /* still no TCB... must be bad cookie-echo */
+ return (NULL);
+ }
+#if defined(__FreeBSD__)
+ if (*netp != NULL) {
+ (*netp)->flowtype = mflowtype;
+ (*netp)->flowid = mflowid;
+ }
+#endif
+ /*
+ * Ok, we built an association so confirm the address we sent the
+ * INIT-ACK to.
+ */
+ netl = sctp_findnet(*stcb, to);
+ /*
+ * This code should in theory NOT run but
+ */
+ if (netl == NULL) {
+ /* TSNH! Huh, why do I need to add this address here? */
+ if (sctp_add_remote_addr(*stcb, to, NULL, port,
+ SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
+ return (NULL);
+ }
+ netl = sctp_findnet(*stcb, to);
+ }
+ if (netl) {
+ if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
+ netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
+ (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
+ netl);
+ send_int_conf = 1;
+ }
+ }
+ sctp_start_net_timers(*stcb);
+ if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
+ if (!had_a_existing_tcb ||
+ (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
+ /*
+ * If we have a NEW cookie or the connect never
+ * reached the connected state during collision we
+ * must do the TCP accept thing.
+ */
+ struct socket *so, *oso;
+ struct sctp_inpcb *inp;
+
+ if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
+ /*
+ * For a restart we will keep the same
+ * socket, no need to do anything. I THINK!!
+ */
+ sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ if (send_int_conf) {
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+ (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+ }
+ return (m);
+ }
+ oso = (*inp_p)->sctp_socket;
+#if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
+ /*
+ * We do this to keep the sockets side happy during
+ * the sonewcon ONLY.
+ */
+ NET_LOCK_GIANT();
+#endif
+ atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK((*stcb));
+#if defined(__FreeBSD__) && __FreeBSD_version >= 801000
+ CURVNET_SET(oso->so_vnet);
+#endif
+#if defined(__APPLE__)
+ SCTP_SOCKET_LOCK(oso, 1);
+#endif
+ so = sonewconn(oso, 0
+#if defined(__APPLE__)
+ ,NULL
+#endif
+#ifdef __Panda__
+ ,NULL , (*inp_p)->def_vrf_id
+#endif
+ );
+#if (defined(__FreeBSD__) && __FreeBSD_version < 700000)
+ NET_UNLOCK_GIANT();
+#endif
+#if defined(__APPLE__)
+ SCTP_SOCKET_UNLOCK(oso, 1);
+#endif
+#if defined(__FreeBSD__) && __FreeBSD_version >= 801000
+ CURVNET_RESTORE();
+#endif
+ SCTP_TCB_LOCK((*stcb));
+ atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+
+ if (so == NULL) {
+ struct mbuf *op_err;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *pcb_so;
+#endif
+ /* Too many sockets */
+ SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
+ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+ sctp_abort_association(*inp_p, NULL, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ pcb_so = SCTP_INP_SO(*inp_p);
+ atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK((*stcb));
+ SCTP_SOCKET_LOCK(pcb_so, 1);
+ SCTP_TCB_LOCK((*stcb));
+ atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(pcb_so, 1);
+#endif
+ return (NULL);
+ }
+ inp = (struct sctp_inpcb *)so->so_pcb;
+ SCTP_INP_INCR_REF(inp);
+ /*
+ * We add the unbound flag here so that
+ * if we get an soabort() before we get the
+ * move_pcb done, we will properly cleanup.
+ */
+ inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
+ SCTP_PCB_FLAGS_CONNECTED |
+ SCTP_PCB_FLAGS_IN_TCPPOOL |
+ SCTP_PCB_FLAGS_UNBOUND |
+ (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
+ SCTP_PCB_FLAGS_DONT_WAKE);
+ inp->sctp_features = (*inp_p)->sctp_features;
+ inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
+ inp->sctp_socket = so;
+ inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
+ inp->max_cwnd = (*inp_p)->max_cwnd;
+ inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
+ inp->ecn_supported = (*inp_p)->ecn_supported;
+ inp->prsctp_supported = (*inp_p)->prsctp_supported;
+ inp->auth_supported = (*inp_p)->auth_supported;
+ inp->asconf_supported = (*inp_p)->asconf_supported;
+ inp->reconfig_supported = (*inp_p)->reconfig_supported;
+ inp->nrsack_supported = (*inp_p)->nrsack_supported;
+ inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
+ inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
+ inp->sctp_context = (*inp_p)->sctp_context;
+ inp->local_strreset_support = (*inp_p)->local_strreset_support;
+ inp->fibnum = (*inp_p)->fibnum;
+ inp->inp_starting_point_for_iterator = NULL;
+#if defined(__Userspace__)
+ inp->ulp_info = (*inp_p)->ulp_info;
+ inp->recv_callback = (*inp_p)->recv_callback;
+ inp->send_callback = (*inp_p)->send_callback;
+ inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
+#endif
+ /*
+ * copy in the authentication parameters from the
+ * original endpoint
+ */
+ if (inp->sctp_ep.local_hmacs)
+ sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
+ inp->sctp_ep.local_hmacs =
+ sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
+ if (inp->sctp_ep.local_auth_chunks)
+ sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
+ inp->sctp_ep.local_auth_chunks =
+ sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
+
+ /*
+ * Now we must move it from one hash table to
+ * another and get the tcb in the right place.
+ */
+
+ /* This is where the one-2-one socket is put into
+ * the accept state waiting for the accept!
+ */
+ if (*stcb) {
+ (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE;
+ }
+ sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
+
+ atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK((*stcb));
+
+#if defined(__FreeBSD__)
+ sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
+ 0);
+#else
+ sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
+#endif
+ SCTP_TCB_LOCK((*stcb));
+ atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+
+
+ /* now we must check to see if we were aborted while
+ * the move was going on and the lock/unlock happened.
+ */
+ if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+ /* yep it was, we leave the
+ * assoc attached to the socket since
+ * the sctp_inpcb_free() call will send
+ * an abort for us.
+ */
+ SCTP_INP_DECR_REF(inp);
+ return (NULL);
+ }
+ SCTP_INP_DECR_REF(inp);
+ /* Switch over to the new guy */
+ *inp_p = inp;
+ sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ if (send_int_conf) {
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+ (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+ }
+
+ /* Pull it from the incomplete queue and wake the guy */
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK((*stcb));
+ SCTP_SOCKET_LOCK(so, 1);
+#endif
+ soisconnected(so);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_TCB_LOCK((*stcb));
+ atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ return (m);
+ }
+ }
+ if (notification) {
+ sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ }
+ if (send_int_conf) {
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+ (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+ }
+ return (m);
+}
+
+static void
+sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
+ struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ /* cp must not be used, others call this without a c-ack :-) */
+ struct sctp_association *asoc;
+
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_cookie_ack: handling COOKIE-ACK\n");
+ if ((stcb == NULL) || (net == NULL)) {
+ return;
+ }
+
+ asoc = &stcb->asoc;
+
+ sctp_stop_all_cookie_timers(stcb);
+ /* process according to association state */
+ if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) {
+ /* state change only needed when I am in right state */
+ SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
+ SCTP_SET_STATE(asoc, SCTP_STATE_OPEN);
+ sctp_start_net_timers(stcb);
+ if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb, asoc->primary_destination);
+
+ }
+ /* update RTO */
+ SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+ SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+ if (asoc->overall_error_count == 0) {
+ net->RTO = sctp_calculate_rto(stcb, asoc, net,
+ &asoc->time_entered, sctp_align_safe_nocopy,
+ SCTP_RTT_FROM_NON_DATA);
+ }
+ (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
+ sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+ (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+
+#endif
+ stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
+ soisconnected(stcb->sctp_socket);
+ }
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+ /*
+ * since we did not send a HB make sure we don't double
+ * things
+ */
+ net->hb_responded = 1;
+
+ if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+ /* We don't need to do the asconf thing,
+ * nor hb or autoclose if the socket is closed.
+ */
+ goto closed_socket;
+ }
+
+ sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
+ stcb, net);
+
+
+ if (stcb->asoc.sctp_autoclose_ticks &&
+ sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+ sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
+ stcb->sctp_ep, stcb, NULL);
+ }
+ /*
+ * send ASCONF if parameters are pending and ASCONFs are
+ * allowed (eg. addresses changed when init/cookie echo were
+ * in flight)
+ */
+ if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
+ (stcb->asoc.asconf_supported == 1) &&
+ (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
+#ifdef SCTP_TIMER_BASED_ASCONF
+ sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
+ stcb->sctp_ep, stcb,
+ stcb->asoc.primary_destination);
+#else
+ sctp_send_asconf(stcb, stcb->asoc.primary_destination,
+ SCTP_ADDR_NOT_LOCKED);
+#endif
+ }
+ }
+closed_socket:
+ /* Toss the cookie if I can */
+ sctp_toss_old_cookies(stcb, asoc);
+ if (!TAILQ_EMPTY(&asoc->sent_queue)) {
+ /* Restart the timer if we have pending data */
+ struct sctp_tmit_chunk *chk;
+
+ chk = TAILQ_FIRST(&asoc->sent_queue);
+ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
+ }
+}
+
+static void
+sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
+ struct sctp_tcb *stcb)
+{
+ struct sctp_nets *net;
+ struct sctp_tmit_chunk *lchk;
+ struct sctp_ecne_chunk bkup;
+ uint8_t override_bit;
+ uint32_t tsn, window_data_tsn;
+ int len;
+ unsigned int pkt_cnt;
+
+ len = ntohs(cp->ch.chunk_length);
+ if ((len != sizeof(struct sctp_ecne_chunk)) &&
+ (len != sizeof(struct old_sctp_ecne_chunk))) {
+ return;
+ }
+ if (len == sizeof(struct old_sctp_ecne_chunk)) {
+ /* Its the old format */
+ memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
+ bkup.num_pkts_since_cwr = htonl(1);
+ cp = &bkup;
+ }
+ SCTP_STAT_INCR(sctps_recvecne);
+ tsn = ntohl(cp->tsn);
+ pkt_cnt = ntohl(cp->num_pkts_since_cwr);
+ lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
+ if (lchk == NULL) {
+ window_data_tsn = stcb->asoc.sending_seq - 1;
+ } else {
+ window_data_tsn = lchk->rec.data.tsn;
+ }
+
+ /* Find where it was sent to if possible. */
+ net = NULL;
+ TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
+ if (lchk->rec.data.tsn == tsn) {
+ net = lchk->whoTo;
+ net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
+ break;
+ }
+ if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
+ break;
+ }
+ }
+ if (net == NULL) {
+ /*
+ * What to do. A previous send of a
+ * CWR was possibly lost. See how old it is, we
+ * may have it marked on the actual net.
+ */
+ TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+ if (tsn == net->last_cwr_tsn) {
+ /* Found him, send it off */
+ break;
+ }
+ }
+ if (net == NULL) {
+ /*
+ * If we reach here, we need to send a special
+ * CWR that says hey, we did this a long time
+ * ago and you lost the response.
+ */
+ net = TAILQ_FIRST(&stcb->asoc.nets);
+ if (net == NULL) {
+ /* TSNH */
+ return;
+ }
+ override_bit = SCTP_CWR_REDUCE_OVERRIDE;
+ } else {
+ override_bit = 0;
+ }
+ } else {
+ override_bit = 0;
+ }
+ if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
+ ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
+ /* JRS - Use the congestion control given in the pluggable CC module */
+ stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
+ /*
+ * We reduce once every RTT. So we will only lower cwnd at
+ * the next sending seq i.e. the window_data_tsn
+ */
+ net->cwr_window_tsn = window_data_tsn;
+ net->ecn_ce_pkt_cnt += pkt_cnt;
+ net->lost_cnt = pkt_cnt;
+ net->last_cwr_tsn = tsn;
+ } else {
+ override_bit |= SCTP_CWR_IN_SAME_WINDOW;
+ if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
+ ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
+ /*
+ * Another loss in the same window update how
+ * many marks/packets lost we have had.
+ */
+ int cnt = 1;
+ if (pkt_cnt > net->lost_cnt) {
+ /* Should be the case */
+ cnt = (pkt_cnt - net->lost_cnt);
+ net->ecn_ce_pkt_cnt += cnt;
+ }
+ net->lost_cnt = pkt_cnt;
+ net->last_cwr_tsn = tsn;
+ /*
+ * Most CC functions will ignore this call, since we are in-window
+ * yet of the initial CE the peer saw.
+ */
+ stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
+ }
+ }
+ /*
+ * We always send a CWR this way if our previous one was lost our
+ * peer will get an update, or if it is not time again to reduce we
+ * still get the cwr to the peer. Note we set the override when we
+ * could not find the TSN on the chunk or the destination network.
+ */
+ sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
+}
+
+static void
+sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ /*
+ * Here we get a CWR from the peer. We must look in the outqueue and
+ * make sure that we have a covered ECNE in the control chunk part.
+ * If so remove it.
+ */
+ struct sctp_tmit_chunk *chk;
+ struct sctp_ecne_chunk *ecne;
+ int override;
+ uint32_t cwr_tsn;
+
+ cwr_tsn = ntohl(cp->tsn);
+ override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
+ TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
+ if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
+ continue;
+ }
+ if ((override == 0) && (chk->whoTo != net)) {
+ /* Must be from the right src unless override is set */
+ continue;
+ }
+ ecne = mtod(chk->data, struct sctp_ecne_chunk *);
+ if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
+ /* this covers this ECNE, we can remove it */
+ stcb->asoc.ecn_echo_cnt_onq--;
+ TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
+ sctp_next);
+ sctp_m_freem(chk->data);
+ chk->data = NULL;
+ stcb->asoc.ctrl_queue_cnt--;
+ sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+ if (override == 0) {
+ break;
+ }
+ }
+ }
+}
+
+static void
+sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
+ struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+ struct sctp_association *asoc;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
+ if (stcb == NULL)
+ return;
+
+ asoc = &stcb->asoc;
+ /* process according to association state */
+ if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ /* unexpected SHUTDOWN-COMPLETE... so ignore... */
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
+ SCTP_TCB_UNLOCK(stcb);
+ return;
+ }
+ /* notify upper layer protocol */
+ if (stcb->sctp_socket) {
+ sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ }
+#ifdef INVARIANTS
+ if (!TAILQ_EMPTY(&asoc->send_queue) ||
+ !TAILQ_EMPTY(&asoc->sent_queue) ||
+ sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
+ panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
+ }
+#endif
+ /* stop the timer */
+ sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
+ SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
+ /* free the TCB */
+ SCTPDBG(SCTP_DEBUG_INPUT2,
+ "sctp_handle_shutdown_complete: calls free-asoc\n");
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(stcb->sctp_ep);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ return;
+}
+
+static int
+process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
+ struct sctp_nets *net, uint8_t flg)
+{
+ switch (desc->chunk_type) {
+ case SCTP_DATA:
+ /* find the tsn to resend (possibly */
+ {
+ uint32_t tsn;
+ struct sctp_tmit_chunk *tp1;
+
+ tsn = ntohl(desc->tsn_ifany);
+ TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+ if (tp1->rec.data.tsn == tsn) {
+ /* found it */
+ break;
+ }
+ if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
+ /* not found */
+ tp1 = NULL;
+ break;
+ }
+ }
+ if (tp1 == NULL) {
+ /*
+ * Do it the other way , aka without paying
+ * attention to queue seq order.
+ */
+ SCTP_STAT_INCR(sctps_pdrpdnfnd);
+ TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+ if (tp1->rec.data.tsn == tsn) {
+ /* found it */
+ break;
+ }
+ }
+ }
+ if (tp1 == NULL) {
+ SCTP_STAT_INCR(sctps_pdrptsnnf);
+ }
+ if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
+ uint8_t *ddp;
+
+ if (((flg & SCTP_BADCRC) == 0) &&
+ ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
+ return (0);
+ }
+ if ((stcb->asoc.peers_rwnd == 0) &&
+ ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
+ SCTP_STAT_INCR(sctps_pdrpdiwnp);
+ return (0);
+ }
+ if (stcb->asoc.peers_rwnd == 0 &&
+ (flg & SCTP_FROM_MIDDLE_BOX)) {
+ SCTP_STAT_INCR(sctps_pdrpdizrw);
+ return (0);
+ }
+ ddp = (uint8_t *) (mtod(tp1->data, caddr_t) +
+ sizeof(struct sctp_data_chunk));
+ {
+ unsigned int iii;
+
+ for (iii = 0; iii < sizeof(desc->data_bytes);
+ iii++) {
+ if (ddp[iii] != desc->data_bytes[iii]) {
+ SCTP_STAT_INCR(sctps_pdrpbadd);
+ return (-1);
+ }
+ }
+ }
+
+ if (tp1->do_rtt) {
+ /*
+ * this guy had a RTO calculation
+ * pending on it, cancel it
+ */
+ if (tp1->whoTo->rto_needed == 0) {
+ tp1->whoTo->rto_needed = 1;
+ }
+ tp1->do_rtt = 0;
+ }
+ SCTP_STAT_INCR(sctps_pdrpmark);
+ if (tp1->sent != SCTP_DATAGRAM_RESEND)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ /*
+ * mark it as if we were doing a FR, since
+ * we will be getting gap ack reports behind
+ * the info from the router.
+ */
+ tp1->rec.data.doing_fast_retransmit = 1;
+ /*
+ * mark the tsn with what sequences can
+ * cause a new FR.
+ */
+ if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
+ tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
+ } else {
+ tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
+ }
+
+ /* restart the timer */
+ sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+ stcb, tp1->whoTo,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
+ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+ stcb, tp1->whoTo);
+
+ /* fix counts and things */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+ sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
+ tp1->whoTo->flight_size,
+ tp1->book_size,
+ (uint32_t)(uintptr_t)stcb,
+ tp1->rec.data.tsn);
+ }
+ if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+ sctp_flight_size_decrease(tp1);
+ sctp_total_flight_decrease(stcb, tp1);
+ }
+ tp1->sent = SCTP_DATAGRAM_RESEND;
+ } {
+ /* audit code */
+ unsigned int audit;
+
+ audit = 0;
+ TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+ if (tp1->sent == SCTP_DATAGRAM_RESEND)
+ audit++;
+ }
+ TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
+ sctp_next) {
+ if (tp1->sent == SCTP_DATAGRAM_RESEND)
+ audit++;
+ }
+ if (audit != stcb->asoc.sent_queue_retran_cnt) {
+ SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
+ audit, stcb->asoc.sent_queue_retran_cnt);
+#ifndef SCTP_AUDITING_ENABLED
+ stcb->asoc.sent_queue_retran_cnt = audit;
+#endif
+ }
+ }
+ }
+ break;
+ case SCTP_ASCONF:
+ {
+ struct sctp_tmit_chunk *asconf;
+
+ TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
+ sctp_next) {
+ if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
+ break;
+ }
+ }
+ if (asconf) {
+ if (asconf->sent != SCTP_DATAGRAM_RESEND)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ asconf->sent = SCTP_DATAGRAM_RESEND;
+ asconf->snd_count--;
+ }
+ }
+ break;
+ case SCTP_INITIATION:
+ /* resend the INIT */
+ stcb->asoc.dropped_special_cnt++;
+ if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
+ /*
+ * If we can get it in, in a few attempts we do
+ * this, otherwise we let the timer fire.
+ */
+ sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
+ stcb, net,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
+ sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+ }
+ break;
+ case SCTP_SELECTIVE_ACK:
+ case SCTP_NR_SELECTIVE_ACK:
+ /* resend the sack */
+ sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
+ break;
+ case SCTP_HEARTBEAT_REQUEST:
+ /* resend a demand HB */
+ if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
+ /* Only retransmit if we KNOW we wont destroy the tcb */
+ sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+ }
+ break;
+ case SCTP_SHUTDOWN:
+ sctp_send_shutdown(stcb, net);
+ break;
+ case SCTP_SHUTDOWN_ACK:
+ sctp_send_shutdown_ack(stcb, net);
+ break;
+ case SCTP_COOKIE_ECHO:
+ {
+ struct sctp_tmit_chunk *cookie;
+
+ cookie = NULL;
+ TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
+ sctp_next) {
+ if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
+ break;
+ }
+ }
+ if (cookie) {
+ if (cookie->sent != SCTP_DATAGRAM_RESEND)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ cookie->sent = SCTP_DATAGRAM_RESEND;
+ sctp_stop_all_cookie_timers(stcb);
+ }
+ }
+ break;
+ case SCTP_COOKIE_ACK:
+ sctp_send_cookie_ack(stcb);
+ break;
+ case SCTP_ASCONF_ACK:
+ /* resend last asconf ack */
+ sctp_send_asconf_ack(stcb);
+ break;
+ case SCTP_IFORWARD_CUM_TSN:
+ case SCTP_FORWARD_CUM_TSN:
+ send_forward_tsn(stcb, &stcb->asoc);
+ break;
+ /* can't do anything with these */
+ case SCTP_PACKET_DROPPED:
+ case SCTP_INITIATION_ACK: /* this should not happen */
+ case SCTP_HEARTBEAT_ACK:
+ case SCTP_ABORT_ASSOCIATION:
+ case SCTP_OPERATION_ERROR:
+ case SCTP_SHUTDOWN_COMPLETE:
+ case SCTP_ECN_ECHO:
+ case SCTP_ECN_CWR:
+ default:
+ break;
+ }
+ return (0);
+}
+
+void
+sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+ uint32_t i;
+ uint16_t temp;
+
+ /*
+ * We set things to 0xffffffff since this is the last delivered sequence
+ * and we will be sending in 0 after the reset.
+ */
+
+ if (number_entries) {
+ for (i = 0; i < number_entries; i++) {
+ temp = ntohs(list[i]);
+ if (temp >= stcb->asoc.streamincnt) {
+ continue;
+ }
+ stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
+ }
+ } else {
+ list = NULL;
+ for (i = 0; i < stcb->asoc.streamincnt; i++) {
+ stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
+ }
+ }
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
+}
+
+static void
+sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+ uint32_t i;
+ uint16_t temp;
+
+ if (number_entries > 0) {
+ for (i = 0; i < number_entries; i++) {
+ temp = ntohs(list[i]);
+ if (temp >= stcb->asoc.streamoutcnt) {
+ /* no such stream */
+ continue;
+ }
+ stcb->asoc.strmout[temp].next_mid_ordered = 0;
+ stcb->asoc.strmout[temp].next_mid_unordered = 0;
+ }
+ } else {
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ stcb->asoc.strmout[i].next_mid_ordered = 0;
+ stcb->asoc.strmout[i].next_mid_unordered = 0;
+ }
+ }
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
+}
+
+static void
+sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+ uint32_t i;
+ uint16_t temp;
+
+ if (number_entries > 0) {
+ for (i = 0; i < number_entries; i++) {
+ temp = ntohs(list[i]);
+ if (temp >= stcb->asoc.streamoutcnt) {
+ /* no such stream */
+ continue;
+ }
+ stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
+ }
+ } else {
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
+ }
+ }
+}
+
+
+struct sctp_stream_reset_request *
+sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
+{
+ struct sctp_association *asoc;
+ struct sctp_chunkhdr *ch;
+ struct sctp_stream_reset_request *r;
+ struct sctp_tmit_chunk *chk;
+ int len, clen;
+
+ asoc = &stcb->asoc;
+ if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
+ asoc->stream_reset_outstanding = 0;
+ return (NULL);
+ }
+ if (stcb->asoc.str_reset == NULL) {
+ asoc->stream_reset_outstanding = 0;
+ return (NULL);
+ }
+ chk = stcb->asoc.str_reset;
+ if (chk->data == NULL) {
+ return (NULL);
+ }
+ if (bchk) {
+ /* he wants a copy of the chk pointer */
+ *bchk = chk;
+ }
+ clen = chk->send_size;
+ ch = mtod(chk->data, struct sctp_chunkhdr *);
+ r = (struct sctp_stream_reset_request *)(ch + 1);
+ if (ntohl(r->request_seq) == seq) {
+ /* found it */
+ return (r);
+ }
+ len = SCTP_SIZE32(ntohs(r->ph.param_length));
+ if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
+ /* move to the next one, there can only be a max of two */
+ r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
+ if (ntohl(r->request_seq) == seq) {
+ return (r);
+ }
+ }
+ /* that seq is not here */
+ return (NULL);
+}
+
+static void
+sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
+{
+ struct sctp_association *asoc;
+ struct sctp_tmit_chunk *chk = stcb->asoc.str_reset;
+
+ if (stcb->asoc.str_reset == NULL) {
+ return;
+ }
+ asoc = &stcb->asoc;
+
+ sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
+ chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
+ TAILQ_REMOVE(&asoc->control_send_queue,
+ chk,
+ sctp_next);
+ if (chk->data) {
+ sctp_m_freem(chk->data);
+ chk->data = NULL;
+ }
+ asoc->ctrl_queue_cnt--;
+ sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+ /*sa_ignore NO_NULL_CHK*/
+ stcb->asoc.str_reset = NULL;
+}
+
+
+static int
+sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
+ uint32_t seq, uint32_t action,
+ struct sctp_stream_reset_response *respin)
+{
+ uint16_t type;
+ int lparm_len;
+ struct sctp_association *asoc = &stcb->asoc;
+ struct sctp_tmit_chunk *chk;
+ struct sctp_stream_reset_request *req_param;
+ struct sctp_stream_reset_out_request *req_out_param;
+ struct sctp_stream_reset_in_request *req_in_param;
+ uint32_t number_entries;
+
+ if (asoc->stream_reset_outstanding == 0) {
+ /* duplicate */
+ return (0);
+ }
+ if (seq == stcb->asoc.str_reset_seq_out) {
+ req_param = sctp_find_stream_reset(stcb, seq, &chk);
+ if (req_param != NULL) {
+ stcb->asoc.str_reset_seq_out++;
+ type = ntohs(req_param->ph.param_type);
+ lparm_len = ntohs(req_param->ph.param_length);
+ if (type == SCTP_STR_RESET_OUT_REQUEST) {
+ int no_clear = 0;
+
+ req_out_param = (struct sctp_stream_reset_out_request *)req_param;
+ number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
+ asoc->stream_reset_out_is_outstanding = 0;
+ if (asoc->stream_reset_outstanding)
+ asoc->stream_reset_outstanding--;
+ if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+ /* do it */
+ sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
+ } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+ } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
+ /* Set it up so we don't stop retransmitting */
+ asoc->stream_reset_outstanding++;
+ stcb->asoc.str_reset_seq_out--;
+ asoc->stream_reset_out_is_outstanding = 1;
+ no_clear = 1;
+ } else {
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+ }
+ if (no_clear == 0) {
+ sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
+ }
+ } else if (type == SCTP_STR_RESET_IN_REQUEST) {
+ req_in_param = (struct sctp_stream_reset_in_request *)req_param;
+ number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
+ if (asoc->stream_reset_outstanding)
+ asoc->stream_reset_outstanding--;
+ if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
+ number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+ } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
+ sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
+ number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+ }
+ } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
+ /* Ok we now may have more streams */
+ int num_stream;
+
+ num_stream = stcb->asoc.strm_pending_add_size;
+ if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
+ /* TSNH */
+ num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
+ }
+ stcb->asoc.strm_pending_add_size = 0;
+ if (asoc->stream_reset_outstanding)
+ asoc->stream_reset_outstanding--;
+ if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+ /* Put the new streams into effect */
+ int i;
+ for ( i = asoc->streamoutcnt; i< (asoc->streamoutcnt + num_stream); i++) {
+ asoc->strmout[i].state = SCTP_STREAM_OPEN;
+ }
+ asoc->streamoutcnt += num_stream;
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
+ } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+ SCTP_STREAM_CHANGE_DENIED);
+ } else {
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+ SCTP_STREAM_CHANGE_FAILED);
+ }
+ } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
+ if (asoc->stream_reset_outstanding)
+ asoc->stream_reset_outstanding--;
+ if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+ SCTP_STREAM_CHANGE_DENIED);
+ } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+ SCTP_STREAM_CHANGE_FAILED);
+ }
+ } else if (type == SCTP_STR_RESET_TSN_REQUEST) {
+ /**
+ * a) Adopt the new in tsn.
+ * b) reset the map
+ * c) Adopt the new out-tsn
+ */
+ struct sctp_stream_reset_response_tsn *resp;
+ struct sctp_forward_tsn_chunk fwdtsn;
+ int abort_flag = 0;
+ if (respin == NULL) {
+ /* huh ? */
+ return (0);
+ }
+ if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
+ return (0);
+ }
+ if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+ resp = (struct sctp_stream_reset_response_tsn *)respin;
+ asoc->stream_reset_outstanding--;
+ fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
+ fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
+ fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
+ sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
+ if (abort_flag) {
+ return (1);
+ }
+ stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+ sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+ }
+
+ stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
+ stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
+ memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
+
+ stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
+ memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
+
+ stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
+ stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
+
+ sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
+ sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
+ sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
+ } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+ sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
+ SCTP_ASSOC_RESET_DENIED);
+ } else {
+ sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
+ SCTP_ASSOC_RESET_FAILED);
+ }
+ }
+ /* get rid of the request and get the request flags */
+ if (asoc->stream_reset_outstanding == 0) {
+ sctp_clean_up_stream_reset(stcb);
+ }
+ }
+ }
+ if (asoc->stream_reset_outstanding == 0) {
+ sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
+ }
+ return (0);
+}
+
+static void
+sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
+ struct sctp_tmit_chunk *chk,
+ struct sctp_stream_reset_in_request *req, int trunc)
+{
+ uint32_t seq;
+ int len, i;
+ int number_entries;
+ uint16_t temp;
+
+ /*
+ * peer wants me to send a str-reset to him for my outgoing seq's if
+ * seq_in is right.
+ */
+ struct sctp_association *asoc = &stcb->asoc;
+
+ seq = ntohl(req->request_seq);
+ if (asoc->str_reset_seq_in == seq) {
+ asoc->last_reset_action[1] = asoc->last_reset_action[0];
+ if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if (trunc) {
+ /* Can't do it, since they exceeded our buffer size */
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
+ len = ntohs(req->ph.param_length);
+ number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
+ if (number_entries) {
+ for (i = 0; i < number_entries; i++) {
+ temp = ntohs(req->list_of_streams[i]);
+ if (temp >= stcb->asoc.streamoutcnt) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ goto bad_boy;
+ }
+ req->list_of_streams[i] = temp;
+ }
+ for (i = 0; i < number_entries; i++) {
+ if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
+ stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
+ }
+ }
+ } else {
+ /* Its all */
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
+ stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
+ }
+ }
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+ } else {
+ /* Can't do it, since we have sent one out */
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
+ }
+ bad_boy:
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ asoc->str_reset_seq_in++;
+ } else if (asoc->str_reset_seq_in - 1 == seq) {
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ } else if (asoc->str_reset_seq_in - 2 == seq) {
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+ } else {
+ sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+ }
+ sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
+}
+
+static int
+sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
+ struct sctp_tmit_chunk *chk,
+ struct sctp_stream_reset_tsn_request *req)
+{
+ /* reset all in and out and update the tsn */
+ /*
+ * A) reset my str-seq's on in and out. B) Select a receive next,
+ * and set cum-ack to it. Also process this selected number as a
+ * fwd-tsn as well. C) set in the response my next sending seq.
+ */
+ struct sctp_forward_tsn_chunk fwdtsn;
+ struct sctp_association *asoc = &stcb->asoc;
+ int abort_flag = 0;
+ uint32_t seq;
+
+ seq = ntohl(req->request_seq);
+ if (asoc->str_reset_seq_in == seq) {
+ asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
+ if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else {
+ fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
+ fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
+ fwdtsn.ch.chunk_flags = 0;
+ fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
+ sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
+ if (abort_flag) {
+ return (1);
+ }
+ asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+ sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+ }
+ asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
+ asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
+ memset(asoc->mapping_array, 0, asoc->mapping_array_size);
+ asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
+ memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
+ atomic_add_int(&asoc->sending_seq, 1);
+ /* save off historical data for retrans */
+ asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
+ asoc->last_sending_seq[0] = asoc->sending_seq;
+ asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
+ asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
+ sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
+ sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+ sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
+ }
+ sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
+ asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
+ asoc->str_reset_seq_in++;
+ } else if (asoc->str_reset_seq_in - 1 == seq) {
+ sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
+ asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
+ } else if (asoc->str_reset_seq_in - 2 == seq) {
+ sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
+ asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
+ } else {
+ sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+ }
+ return (0);
+}
+
+static void
+sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
+ struct sctp_tmit_chunk *chk,
+ struct sctp_stream_reset_out_request *req, int trunc)
+{
+ uint32_t seq, tsn;
+ int number_entries, len;
+ struct sctp_association *asoc = &stcb->asoc;
+
+ seq = ntohl(req->request_seq);
+
+ /* now if its not a duplicate we process it */
+ if (asoc->str_reset_seq_in == seq) {
+ len = ntohs(req->ph.param_length);
+ number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
+ /*
+ * the sender is resetting, handle the list issue.. we must
+ * a) verify if we can do the reset, if so no problem b) If
+ * we can't do the reset we must copy the request. c) queue
+ * it, and setup the data in processor to trigger it off
+ * when needed and dequeue all the queued data.
+ */
+ tsn = ntohl(req->send_reset_at_tsn);
+
+ /* move the reset action back one */
+ asoc->last_reset_action[1] = asoc->last_reset_action[0];
+ if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if (trunc) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
+ /* we can do it now */
+ sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+ } else {
+ /*
+ * we must queue it up and thus wait for the TSN's
+ * to arrive that are at or before tsn
+ */
+ struct sctp_stream_reset_list *liste;
+ int siz;
+
+ siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
+ SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
+ siz, SCTP_M_STRESET);
+ if (liste == NULL) {
+ /* gak out of memory */
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ return;
+ }
+ liste->seq = seq;
+ liste->tsn = tsn;
+ liste->number_entries = number_entries;
+ memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
+ TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
+ }
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ asoc->str_reset_seq_in++;
+ } else if ((asoc->str_reset_seq_in - 1) == seq) {
+ /*
+ * one seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ } else if ((asoc->str_reset_seq_in - 2) == seq) {
+ /*
+ * two seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+ } else {
+ sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+ }
+}
+
+static void
+sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
+ struct sctp_stream_reset_add_strm *str_add)
+{
+ /*
+ * Peer is requesting to add more streams.
+ * If its within our max-streams we will
+ * allow it.
+ */
+ uint32_t num_stream, i;
+ uint32_t seq;
+ struct sctp_association *asoc = &stcb->asoc;
+ struct sctp_queued_to_read *ctl, *nctl;
+
+ /* Get the number. */
+ seq = ntohl(str_add->request_seq);
+ num_stream = ntohs(str_add->number_of_streams);
+ /* Now what would be the new total? */
+ if (asoc->str_reset_seq_in == seq) {
+ num_stream += stcb->asoc.streamincnt;
+ stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
+ if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if ((num_stream > stcb->asoc.max_inbound_streams) ||
+ (num_stream > 0xffff)) {
+ /* We must reject it they ask for to many */
+ denied:
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else {
+ /* Ok, we can do that :-) */
+ struct sctp_stream_in *oldstrm;
+
+ /* save off the old */
+ oldstrm = stcb->asoc.strmin;
+ SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
+ (num_stream * sizeof(struct sctp_stream_in)),
+ SCTP_M_STRMI);
+ if (stcb->asoc.strmin == NULL) {
+ stcb->asoc.strmin = oldstrm;
+ goto denied;
+ }
+ /* copy off the old data */
+ for (i = 0; i < stcb->asoc.streamincnt; i++) {
+ TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
+ TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
+ stcb->asoc.strmin[i].sid = i;
+ stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
+ stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
+ stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
+ /* now anything on those queues? */
+ TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
+ TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
+ TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
+ }
+ TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
+ TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
+ TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
+ }
+ }
+ /* Init the new streams */
+ for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
+ TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
+ TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
+ stcb->asoc.strmin[i].sid = i;
+ stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
+ stcb->asoc.strmin[i].pd_api_started = 0;
+ stcb->asoc.strmin[i].delivery_started = 0;
+ }
+ SCTP_FREE(oldstrm, SCTP_M_STRMI);
+ /* update the size */
+ stcb->asoc.streamincnt = num_stream;
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+ sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
+ }
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ asoc->str_reset_seq_in++;
+ } else if ((asoc->str_reset_seq_in - 1) == seq) {
+ /*
+ * one seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ } else if ((asoc->str_reset_seq_in - 2) == seq) {
+ /*
+ * two seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+ } else {
+ sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+
+ }
+}
+
+static void
+sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
+ struct sctp_stream_reset_add_strm *str_add)
+{
+ /*
+ * Peer is requesting to add more streams.
+ * If its within our max-streams we will
+ * allow it.
+ */
+ uint16_t num_stream;
+ uint32_t seq;
+ struct sctp_association *asoc = &stcb->asoc;
+
+ /* Get the number. */
+ seq = ntohl(str_add->request_seq);
+ num_stream = ntohs(str_add->number_of_streams);
+ /* Now what would be the new total? */
+ if (asoc->str_reset_seq_in == seq) {
+ stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
+ if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) {
+ asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ } else if (stcb->asoc.stream_reset_outstanding) {
+ /* We must reject it we have something pending */
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
+ } else {
+ /* Ok, we can do that :-) */
+ int mychk;
+ mychk = stcb->asoc.streamoutcnt;
+ mychk += num_stream;
+ if (mychk < 0x10000) {
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+ if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ }
+ } else {
+ stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+ }
+ }
+ sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
+ asoc->str_reset_seq_in++;
+ } else if ((asoc->str_reset_seq_in - 1) == seq) {
+ /*
+ * one seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+ } else if ((asoc->str_reset_seq_in - 2) == seq) {
+ /*
+ * two seq back, just echo back last action since my
+ * response was lost.
+ */
+ sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+ } else {
+ sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+ }
+}
+
+#if !defined(__Panda__)
+#ifdef __GNUC__
+__attribute__ ((noinline))
+#endif
+#endif
+static int
+sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
+ struct sctp_chunkhdr *ch_req)
+{
+ uint16_t remaining_length, param_len, ptype;
+ struct sctp_paramhdr pstore;
+ uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
+ uint32_t seq = 0;
+ int num_req = 0;
+ int trunc = 0;
+ struct sctp_tmit_chunk *chk;
+ struct sctp_chunkhdr *ch;
+ struct sctp_paramhdr *ph;
+ int ret_code = 0;
+ int num_param = 0;
+
+ /* now it may be a reset or a reset-response */
+ remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
+
+ /* setup for adding the response */
+ sctp_alloc_a_chunk(stcb, chk);
+ if (chk == NULL) {
+ return (ret_code);
+ }
+ chk->copy_by_ref = 0;
+ chk->rec.chunk_id.id = SCTP_STREAM_RESET;
+ chk->rec.chunk_id.can_take_data = 0;
+ chk->flags = 0;
+ chk->asoc = &stcb->asoc;
+ chk->no_fr_allowed = 0;
+ chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
+ chk->book_size_scale = 0;
+ chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
+ if (chk->data == NULL) {
+ strres_nochunk:
+ if (chk->data) {
+ sctp_m_freem(chk->data);
+ chk->data = NULL;
+ }
+ sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+ return (ret_code);
+ }
+ SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
+
+ /* setup chunk parameters */
+ chk->sent = SCTP_DATAGRAM_UNSENT;
+ chk->snd_count = 0;
+ chk->whoTo = NULL;
+
+ ch = mtod(chk->data, struct sctp_chunkhdr *);
+ ch->chunk_type = SCTP_STREAM_RESET;
+ ch->chunk_flags = 0;
+ ch->chunk_length = htons(chk->send_size);
+ SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
+ offset += sizeof(struct sctp_chunkhdr);
+ while (remaining_length >= sizeof(struct sctp_paramhdr)) {
+ ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
+ if (ph == NULL) {
+ /* TSNH */
+ break;
+ }
+ param_len = ntohs(ph->param_length);
+ if ((param_len > remaining_length) ||
+ (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
+ /* bad parameter length */
+ break;
+ }
+ ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
+ (uint8_t *)&cstore);
+ if (ph == NULL) {
+ /* TSNH */
+ break;
+ }
+ ptype = ntohs(ph->param_type);
+ num_param++;
+ if (param_len > sizeof(cstore)) {
+ trunc = 1;
+ } else {
+ trunc = 0;
+ }
+ if (num_param > SCTP_MAX_RESET_PARAMS) {
+ /* hit the max of parameters already sorry.. */
+ break;
+ }
+ if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
+ struct sctp_stream_reset_out_request *req_out;
+
+ if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
+ break;
+ }
+ req_out = (struct sctp_stream_reset_out_request *)ph;
+ num_req++;
+ if (stcb->asoc.stream_reset_outstanding) {
+ seq = ntohl(req_out->response_seq);
+ if (seq == stcb->asoc.str_reset_seq_out) {
+ /* implicit ack */
+ (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
+ }
+ }
+ sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
+ } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
+ struct sctp_stream_reset_add_strm *str_add;
+
+ if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
+ break;
+ }
+ str_add = (struct sctp_stream_reset_add_strm *)ph;
+ num_req++;
+ sctp_handle_str_reset_add_strm(stcb, chk, str_add);
+ } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
+ struct sctp_stream_reset_add_strm *str_add;
+
+ if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
+ break;
+ }
+ str_add = (struct sctp_stream_reset_add_strm *)ph;
+ num_req++;
+ sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
+ } else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
+ struct sctp_stream_reset_in_request *req_in;
+
+ num_req++;
+ req_in = (struct sctp_stream_reset_in_request *)ph;
+ sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
+ } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
+ struct sctp_stream_reset_tsn_request *req_tsn;
+
+ num_req++;
+ req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
+ if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
+ ret_code = 1;
+ goto strres_nochunk;
+ }
+ /* no more */
+ break;
+ } else if (ptype == SCTP_STR_RESET_RESPONSE) {
+ struct sctp_stream_reset_response *resp;
+ uint32_t result;
+
+ if (param_len < sizeof(struct sctp_stream_reset_response)) {
+ break;
+ }
+ resp = (struct sctp_stream_reset_response *)ph;
+ seq = ntohl(resp->response_seq);
+ result = ntohl(resp->result);
+ if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
+ ret_code = 1;
+ goto strres_nochunk;
+ }
+ } else {
+ break;
+ }
+ offset += SCTP_SIZE32(param_len);
+ if (remaining_length >= SCTP_SIZE32(param_len)) {
+ remaining_length -= SCTP_SIZE32(param_len);
+ } else {
+ remaining_length = 0;
+ }
+ }
+ if (num_req == 0) {
+ /* we have no response free the stuff */
+ goto strres_nochunk;
+ }
+ /* ok we have a chunk to link in */
+ TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
+ chk,
+ sctp_next);
+ stcb->asoc.ctrl_queue_cnt++;
+ return (ret_code);
+}
+
+/*
+ * Handle a router or endpoints report of a packet loss, there are two ways
+ * to handle this, either we get the whole packet and must disect it
+ * ourselves (possibly with truncation and or corruption) or it is a summary
+ * from a middle box that did the disectting for us.
+ */
+static void
+sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
+ struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
+{
+ uint32_t bottle_bw, on_queue;
+ uint16_t trunc_len;
+ unsigned int chlen;
+ unsigned int at;
+ struct sctp_chunk_desc desc;
+ struct sctp_chunkhdr *ch;
+
+ chlen = ntohs(cp->ch.chunk_length);
+ chlen -= sizeof(struct sctp_pktdrop_chunk);
+ /* XXX possible chlen underflow */
+ if (chlen == 0) {
+ ch = NULL;
+ if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)
+ SCTP_STAT_INCR(sctps_pdrpbwrpt);
+ } else {
+ ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr));
+ chlen -= sizeof(struct sctphdr);
+ /* XXX possible chlen underflow */
+ memset(&desc, 0, sizeof(desc));
+ }
+ trunc_len = (uint16_t) ntohs(cp->trunc_len);
+ if (trunc_len > limit) {
+ trunc_len = limit;
+ }
+
+ /* now the chunks themselves */
+ while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) {
+ desc.chunk_type = ch->chunk_type;
+ /* get amount we need to move */
+ at = ntohs(ch->chunk_length);
+ if (at < sizeof(struct sctp_chunkhdr)) {
+ /* corrupt chunk, maybe at the end? */
+ SCTP_STAT_INCR(sctps_pdrpcrupt);
+ break;
+ }
+ if (trunc_len == 0) {
+ /* we are supposed to have all of it */
+ if (at > chlen) {
+ /* corrupt skip it */
+ SCTP_STAT_INCR(sctps_pdrpcrupt);
+ break;
+ }
+ } else {
+ /* is there enough of it left ? */
+ if (desc.chunk_type == SCTP_DATA) {
+ if (chlen < (sizeof(struct sctp_data_chunk) +
+ sizeof(desc.data_bytes))) {
+ break;
+ }
+ } else {
+ if (chlen < sizeof(struct sctp_chunkhdr)) {
+ break;
+ }
+ }
+ }
+ if (desc.chunk_type == SCTP_DATA) {
+ /* can we get out the tsn? */
+ if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
+ SCTP_STAT_INCR(sctps_pdrpmbda);
+
+ if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) {
+ /* yep */
+ struct sctp_data_chunk *dcp;
+ uint8_t *ddp;
+ unsigned int iii;
+
+ dcp = (struct sctp_data_chunk *)ch;
+ ddp = (uint8_t *) (dcp + 1);
+ for (iii = 0; iii < sizeof(desc.data_bytes); iii++) {
+ desc.data_bytes[iii] = ddp[iii];
+ }
+ desc.tsn_ifany = dcp->dp.tsn;
+ } else {
+ /* nope we are done. */
+ SCTP_STAT_INCR(sctps_pdrpnedat);
+ break;
+ }
+ } else {
+ if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX))
+ SCTP_STAT_INCR(sctps_pdrpmbct);
+ }
+
+ if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) {
+ SCTP_STAT_INCR(sctps_pdrppdbrk);
+ break;
+ }
+ if (SCTP_SIZE32(at) > chlen) {
+ break;
+ }
+ chlen -= SCTP_SIZE32(at);
+ if (chlen < sizeof(struct sctp_chunkhdr)) {
+ /* done, none left */
+ break;
+ }
+ ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at));
+ }
+ /* Now update any rwnd --- possibly */
+ if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
+ /* From a peer, we get a rwnd report */
+ uint32_t a_rwnd;
+
+ SCTP_STAT_INCR(sctps_pdrpfehos);
+
+ bottle_bw = ntohl(cp->bottle_bw);
+ on_queue = ntohl(cp->current_onq);
+ if (bottle_bw && on_queue) {
+ /* a rwnd report is in here */
+ if (bottle_bw > on_queue)
+ a_rwnd = bottle_bw - on_queue;
+ else
+ a_rwnd = 0;
+
+ if (a_rwnd == 0)
+ stcb->asoc.peers_rwnd = 0;
+ else {
+ if (a_rwnd > stcb->asoc.total_flight) {
+ stcb->asoc.peers_rwnd =
+ a_rwnd - stcb->asoc.total_flight;
+ } else {
+ stcb->asoc.peers_rwnd = 0;
+ }
+ if (stcb->asoc.peers_rwnd <
+ stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+ /* SWS sender side engages */
+ stcb->asoc.peers_rwnd = 0;
+ }
+ }
+ }
+ } else {
+ SCTP_STAT_INCR(sctps_pdrpfmbox);
+ }
+
+ /* now middle boxes in sat networks get a cwnd bump */
+ if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) &&
+ (stcb->asoc.sat_t3_loss_recovery == 0) &&
+ (stcb->asoc.sat_network)) {
+ /*
+ * This is debatable but for sat networks it makes sense
+ * Note if a T3 timer has went off, we will prohibit any
+ * changes to cwnd until we exit the t3 loss recovery.
+ */
+ stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
+ net, cp, &bottle_bw, &on_queue);
+ }
+}
+
+/*
+ * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
+ * still contain IP/SCTP header - stcb: is the tcb found for this packet -
+ * offset: offset into the mbuf chain to first chunkhdr - length: is the
+ * length of the complete packet outputs: - length: modified to remaining
+ * length after control processing - netp: modified to new sctp_nets after
+ * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
+ * bad packet,...) otherwise return the tcb for this packet
+ */
+#if !defined(__Panda__)
+#ifdef __GNUC__
+__attribute__ ((noinline))
+#endif
+#endif
+static struct sctp_tcb *
+sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ struct sctp_association *asoc;
+ struct mbuf *op_err;
+ char msg[SCTP_DIAG_INFO_LEN];
+ uint32_t vtag_in;
+ int num_chunks = 0; /* number of control chunks processed */
+ uint32_t chk_length;
+ int ret;
+ int abort_no_unlock = 0;
+ int ecne_seen = 0;
+ /*
+ * How big should this be, and should it be alloc'd? Lets try the
+ * d-mtu-ceiling for now (2k) and that should hopefully work ...
+ * until we get into jumbo grams and such..
+ */
+ uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
+ struct sctp_tcb *locked_tcb = stcb;
+ int got_auth = 0;
+ uint32_t auth_offset = 0, auth_len = 0;
+ int auth_skipped = 0;
+ int asconf_cnt = 0;
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ struct socket *so;
+#endif
+
+ SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
+ iphlen, *offset, length, (void *)stcb);
+
+ /* validate chunk header length... */
+ if (ntohs(ch->chunk_length) < sizeof(*ch)) {
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
+ ntohs(ch->chunk_length));
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ /*
+ * validate the verification tag
+ */
+ vtag_in = ntohl(sh->v_tag);
+
+ if (locked_tcb) {
+ SCTP_TCB_LOCK_ASSERT(locked_tcb);
+ }
+ if (ch->chunk_type == SCTP_INITIATION) {
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
+ ntohs(ch->chunk_length), vtag_in);
+ if (vtag_in != 0) {
+ /* protocol error- silently discard... */
+ SCTP_STAT_INCR(sctps_badvtag);
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ } else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
+ /*
+ * If there is no stcb, skip the AUTH chunk and process
+ * later after a stcb is found (to validate the lookup was
+ * valid.
+ */
+ if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
+ (stcb == NULL) &&
+ (inp->auth_supported == 1)) {
+ /* save this chunk for later processing */
+ auth_skipped = 1;
+ auth_offset = *offset;
+ auth_len = ntohs(ch->chunk_length);
+
+ /* (temporarily) move past this chunk */
+ *offset += SCTP_SIZE32(auth_len);
+ if (*offset >= length) {
+ /* no more data left in the mbuf chain */
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+ sizeof(struct sctp_chunkhdr), chunk_buf);
+ }
+ if (ch == NULL) {
+ /* Help */
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ if (ch->chunk_type == SCTP_COOKIE_ECHO) {
+ goto process_control_chunks;
+ }
+ /*
+ * first check if it's an ASCONF with an unknown src addr we
+ * need to look inside to find the association
+ */
+ if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
+ struct sctp_chunkhdr *asconf_ch = ch;
+ uint32_t asconf_offset = 0, asconf_len = 0;
+
+ /* inp's refcount may be reduced */
+ SCTP_INP_INCR_REF(inp);
+
+ asconf_offset = *offset;
+ do {
+ asconf_len = ntohs(asconf_ch->chunk_length);
+ if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
+ break;
+ stcb = sctp_findassociation_ep_asconf(m,
+ *offset,
+ dst,
+ sh, &inp, netp, vrf_id);
+ if (stcb != NULL)
+ break;
+ asconf_offset += SCTP_SIZE32(asconf_len);
+ asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
+ sizeof(struct sctp_chunkhdr), chunk_buf);
+ } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
+ if (stcb == NULL) {
+ /*
+ * reduce inp's refcount if not reduced in
+ * sctp_findassociation_ep_asconf().
+ */
+ SCTP_INP_DECR_REF(inp);
+ } else {
+ locked_tcb = stcb;
+ }
+
+ /* now go back and verify any auth chunk to be sure */
+ if (auth_skipped && (stcb != NULL)) {
+ struct sctp_auth_chunk *auth;
+
+ auth = (struct sctp_auth_chunk *)
+ sctp_m_getptr(m, auth_offset,
+ auth_len, chunk_buf);
+ got_auth = 1;
+ auth_skipped = 0;
+ if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
+ auth_offset)) {
+ /* auth HMAC failed so dump it */
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ } else {
+ /* remaining chunks are HMAC checked */
+ stcb->asoc.authenticated = 1;
+ }
+ }
+ }
+ if (stcb == NULL) {
+ snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ msg);
+ /* no association, so it's out of the blue... */
+ sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, port);
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ asoc = &stcb->asoc;
+ /* ABORT and SHUTDOWN can use either v_tag... */
+ if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
+ (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
+ (ch->chunk_type == SCTP_PACKET_DROPPED)) {
+ /* Take the T-bit always into account. */
+ if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
+ (vtag_in == asoc->my_vtag)) ||
+ (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
+ (vtag_in == asoc->peer_vtag))) {
+ /* this is valid */
+ } else {
+ /* drop this packet... */
+ SCTP_STAT_INCR(sctps_badvtag);
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
+ if (vtag_in != asoc->my_vtag) {
+ /*
+ * this could be a stale SHUTDOWN-ACK or the
+ * peer never got the SHUTDOWN-COMPLETE and
+ * is still hung; we have started a new asoc
+ * but it won't complete until the shutdown
+ * is completed
+ */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ msg);
+ sctp_handle_ootb(m, iphlen, *offset, src, dst,
+ sh, inp, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ return (NULL);
+ }
+ } else {
+ /* for all other chunks, vtag must match */
+ if (vtag_in != asoc->my_vtag) {
+ /* invalid vtag... */
+ SCTPDBG(SCTP_DEBUG_INPUT3,
+ "invalid vtag: %xh, expect %xh\n",
+ vtag_in, asoc->my_vtag);
+ SCTP_STAT_INCR(sctps_badvtag);
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ }
+ } /* end if !SCTP_COOKIE_ECHO */
+ /*
+ * process all control chunks...
+ */
+ if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
+ (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
+ (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
+ (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
+ /* implied cookie-ack.. we must have lost the ack */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
+ *netp);
+ }
+
+ process_control_chunks:
+ while (IS_SCTP_CONTROL(ch)) {
+ /* validate chunk length */
+ chk_length = ntohs(ch->chunk_length);
+ SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
+ ch->chunk_type, chk_length);
+ SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
+ if (chk_length < sizeof(*ch) ||
+ (*offset + (int)chk_length) > length) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
+ /*
+ * INIT-ACK only gets the init ack "header" portion only
+ * because we don't have to process the peer's COOKIE. All
+ * others get a complete chunk.
+ */
+ if ((ch->chunk_type == SCTP_INITIATION_ACK) ||
+ (ch->chunk_type == SCTP_INITIATION)) {
+ /* get an init-ack chunk */
+ ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+ sizeof(struct sctp_init_ack_chunk), chunk_buf);
+ if (ch == NULL) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ } else {
+ /* For cookies and all other chunks. */
+ if (chk_length > sizeof(chunk_buf)) {
+ /*
+ * use just the size of the chunk buffer
+ * so the front part of our chunks fit in
+ * contiguous space up to the chunk buffer
+ * size (508 bytes).
+ * For chunks that need to get more than that
+ * they must use the sctp_m_getptr() function
+ * or other means (e.g. know how to parse mbuf
+ * chains). Cookies do this already.
+ */
+ ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+ (sizeof(chunk_buf) - 4),
+ chunk_buf);
+ if (ch == NULL) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ } else {
+ /* We can fit it all */
+ ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+ chk_length, chunk_buf);
+ if (ch == NULL) {
+ SCTP_PRINTF("sctp_process_control: Can't get the all data....\n");
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ }
+ }
+ num_chunks++;
+ /* Save off the last place we got a control from */
+ if (stcb != NULL) {
+ if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
+ /*
+ * allow last_control to be NULL if
+ * ASCONF... ASCONF processing will find the
+ * right net later
+ */
+ if ((netp != NULL) && (*netp != NULL))
+ stcb->asoc.last_control_chunk_from = *netp;
+ }
+ }
+#ifdef SCTP_AUDITING_ENABLED
+ sctp_audit_log(0xB0, ch->chunk_type);
+#endif
+
+ /* check to see if this chunk required auth, but isn't */
+ if ((stcb != NULL) &&
+ (stcb->asoc.auth_supported == 1) &&
+ sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
+ !stcb->asoc.authenticated) {
+ /* "silently" ignore */
+ SCTP_STAT_INCR(sctps_recvauthmissing);
+ goto next_chunk;
+ }
+ switch (ch->chunk_type) {
+ case SCTP_INITIATION:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
+ /* The INIT chunk must be the only chunk. */
+ if ((num_chunks > 1) ||
+ (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+ /* RFC 4960 requires that no ABORT is sent */
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ /* Honor our resource limit. */
+ if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
+ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+ sctp_abort_association(inp, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ *offset = length;
+ return (NULL);
+ }
+ sctp_handle_init(m, iphlen, *offset, src, dst, sh,
+ (struct sctp_init_chunk *)ch, inp,
+ stcb, *netp, &abort_no_unlock,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ *offset = length;
+ if ((!abort_no_unlock) && (locked_tcb)) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ break;
+ case SCTP_PAD_CHUNK:
+ break;
+ case SCTP_INITIATION_ACK:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n");
+ if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+ /* We are not interested anymore */
+ if ((stcb) && (stcb->asoc.total_output_queue_size)) {
+ ;
+ } else {
+ if ((locked_tcb != NULL) && (locked_tcb != stcb)) {
+ /* Very unlikely */
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ if (stcb) {
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(inp);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ }
+ return (NULL);
+ }
+ }
+ /* The INIT-ACK chunk must be the only chunk. */
+ if ((num_chunks > 1) ||
+ (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ if ((netp) && (*netp)) {
+ ret = sctp_handle_init_ack(m, iphlen, *offset,
+ src, dst, sh,
+ (struct sctp_init_ack_chunk *)ch,
+ stcb, *netp,
+ &abort_no_unlock,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id);
+ } else {
+ ret = -1;
+ }
+ *offset = length;
+ if (abort_no_unlock) {
+ return (NULL);
+ }
+ /*
+ * Special case, I must call the output routine to
+ * get the cookie echoed
+ */
+ if ((stcb != NULL) && (ret == 0)) {
+ sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+ }
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ break;
+ case SCTP_SELECTIVE_ACK:
+ {
+ struct sctp_sack_chunk *sack;
+ int abort_now = 0;
+ uint32_t a_rwnd, cum_ack;
+ uint16_t num_seg, num_dup;
+ uint8_t flags;
+ int offset_seg, offset_dup;
+
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n");
+ SCTP_STAT_INCR(sctps_recvsacks);
+ if (stcb == NULL) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n");
+ break;
+ }
+ if (chk_length < sizeof(struct sctp_sack_chunk)) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
+ break;
+ }
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ /*-
+ * If we have sent a shutdown-ack, we will pay no
+ * attention to a sack sent in to us since
+ * we don't care anymore.
+ */
+ break;
+ }
+ sack = (struct sctp_sack_chunk *)ch;
+ flags = ch->chunk_flags;
+ cum_ack = ntohl(sack->sack.cum_tsn_ack);
+ num_seg = ntohs(sack->sack.num_gap_ack_blks);
+ num_dup = ntohs(sack->sack.num_dup_tsns);
+ a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd);
+ if (sizeof(struct sctp_sack_chunk) +
+ num_seg * sizeof(struct sctp_gap_ack_block) +
+ num_dup * sizeof(uint32_t) != chk_length) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
+ break;
+ }
+ offset_seg = *offset + sizeof(struct sctp_sack_chunk);
+ offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
+ cum_ack, num_seg, a_rwnd);
+ stcb->asoc.seen_a_sack_this_pkt = 1;
+ if ((stcb->asoc.pr_sctp_cnt == 0) &&
+ (num_seg == 0) &&
+ SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
+ (stcb->asoc.saw_sack_with_frags == 0) &&
+ (stcb->asoc.saw_sack_with_nr_frags == 0) &&
+ (!TAILQ_EMPTY(&stcb->asoc.sent_queue))
+ ) {
+ /* We have a SIMPLE sack having no prior segments and
+ * data on sent queue to be acked.. Use the faster
+ * path sack processing. We also allow window update
+ * sacks with no missing segments to go this way too.
+ */
+ sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen);
+ } else {
+ if (netp && *netp)
+ sctp_handle_sack(m, offset_seg, offset_dup, stcb,
+ num_seg, 0, num_dup, &abort_now, flags,
+ cum_ack, a_rwnd, ecne_seen);
+ }
+ if (abort_now) {
+ /* ABORT signal from sack processing */
+ *offset = length;
+ return (NULL);
+ }
+ if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
+ TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
+ (stcb->asoc.stream_queue_cnt == 0)) {
+ sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ }
+ }
+ break;
+ /* EY - nr_sack: If the received chunk is an nr_sack chunk */
+ case SCTP_NR_SELECTIVE_ACK:
+ {
+ struct sctp_nr_sack_chunk *nr_sack;
+ int abort_now = 0;
+ uint32_t a_rwnd, cum_ack;
+ uint16_t num_seg, num_nr_seg, num_dup;
+ uint8_t flags;
+ int offset_seg, offset_dup;
+
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n");
+ SCTP_STAT_INCR(sctps_recvsacks);
+ if (stcb == NULL) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n");
+ break;
+ }
+ if (stcb->asoc.nrsack_supported == 0) {
+ goto unknown_chunk;
+ }
+ if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n");
+ break;
+ }
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+ /*-
+ * If we have sent a shutdown-ack, we will pay no
+ * attention to a sack sent in to us since
+ * we don't care anymore.
+ */
+ break;
+ }
+ nr_sack = (struct sctp_nr_sack_chunk *)ch;
+ flags = ch->chunk_flags;
+ cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
+ num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
+ num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
+ num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
+ a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd);
+ if (sizeof(struct sctp_nr_sack_chunk) +
+ (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
+ num_dup * sizeof(uint32_t) != chk_length) {
+ SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
+ break;
+ }
+ offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
+ offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n",
+ cum_ack, num_seg, a_rwnd);
+ stcb->asoc.seen_a_sack_this_pkt = 1;
+ if ((stcb->asoc.pr_sctp_cnt == 0) &&
+ (num_seg == 0) && (num_nr_seg == 0) &&
+ SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
+ (stcb->asoc.saw_sack_with_frags == 0) &&
+ (stcb->asoc.saw_sack_with_nr_frags == 0) &&
+ (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
+ /*
+ * We have a SIMPLE sack having no
+ * prior segments and data on sent
+ * queue to be acked. Use the
+ * faster path sack processing. We
+ * also allow window update sacks
+ * with no missing segments to go
+ * this way too.
+ */
+ sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
+ &abort_now, ecne_seen);
+ } else {
+ if (netp && *netp)
+ sctp_handle_sack(m, offset_seg, offset_dup, stcb,
+ num_seg, num_nr_seg, num_dup, &abort_now, flags,
+ cum_ack, a_rwnd, ecne_seen);
+ }
+ if (abort_now) {
+ /* ABORT signal from sack processing */
+ *offset = length;
+ return (NULL);
+ }
+ if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
+ TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
+ (stcb->asoc.stream_queue_cnt == 0)) {
+ sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+ }
+ }
+ break;
+
+ case SCTP_HEARTBEAT_REQUEST:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
+ if ((stcb) && netp && *netp) {
+ SCTP_STAT_INCR(sctps_recvheartbeat);
+ sctp_send_heartbeat_ack(stcb, m, *offset,
+ chk_length, *netp);
+
+ /* He's alive so give him credit */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ }
+ break;
+ case SCTP_HEARTBEAT_ACK:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n");
+ if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
+ /* Its not ours */
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ /* He's alive so give him credit */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ SCTP_STAT_INCR(sctps_recvheartbeatack);
+ if (netp && *netp)
+ sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
+ stcb, *netp);
+ break;
+ case SCTP_ABORT_ASSOCIATION:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
+ (void *)stcb);
+ if ((stcb) && netp && *netp)
+ sctp_handle_abort((struct sctp_abort_chunk *)ch,
+ stcb, *netp);
+ *offset = length;
+ return (NULL);
+ break;
+ case SCTP_SHUTDOWN:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
+ (void *)stcb);
+ if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ if (netp && *netp) {
+ int abort_flag = 0;
+
+ sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
+ stcb, *netp, &abort_flag);
+ if (abort_flag) {
+ *offset = length;
+ return (NULL);
+ }
+ }
+ break;
+ case SCTP_SHUTDOWN_ACK:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb);
+ if ((stcb) && (netp) && (*netp))
+ sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
+ *offset = length;
+ return (NULL);
+ break;
+
+ case SCTP_OPERATION_ERROR:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n");
+ if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) {
+ *offset = length;
+ return (NULL);
+ }
+ break;
+ case SCTP_COOKIE_ECHO:
+ SCTPDBG(SCTP_DEBUG_INPUT3,
+ "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb);
+ if ((stcb) && (stcb->asoc.total_output_queue_size)) {
+ ;
+ } else {
+ if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+ /* We are not interested anymore */
+ abend:
+ if (stcb) {
+ SCTP_TCB_UNLOCK(stcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ }
+ /*
+ * First are we accepting? We do this again here
+ * since it is possible that a previous endpoint WAS
+ * listening responded to a INIT-ACK and then
+ * closed. We opened and bound.. and are now no
+ * longer listening.
+ */
+
+ if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) {
+ if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
+ (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
+ op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+ sctp_abort_association(inp, stcb, m, iphlen,
+ src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid,
+#endif
+ vrf_id, port);
+ }
+ *offset = length;
+ return (NULL);
+ } else {
+ struct mbuf *ret_buf;
+ struct sctp_inpcb *linp;
+ if (stcb) {
+ linp = NULL;
+ } else {
+ linp = inp;
+ }
+
+ if (linp) {
+ SCTP_ASOC_CREATE_LOCK(linp);
+ if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
+ (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
+ SCTP_ASOC_CREATE_UNLOCK(linp);
+ goto abend;
+ }
+ }
+
+ if (netp) {
+ ret_buf =
+ sctp_handle_cookie_echo(m, iphlen,
+ *offset,
+ src, dst,
+ sh,
+ (struct sctp_cookie_echo_chunk *)ch,
+ &inp, &stcb, netp,
+ auth_skipped,
+ auth_offset,
+ auth_len,
+ &locked_tcb,
+#if defined(__FreeBSD__)
+ mflowtype,
+ mflowid,
+#endif
+ vrf_id,
+ port);
+ } else {
+ ret_buf = NULL;
+ }
+ if (linp) {
+ SCTP_ASOC_CREATE_UNLOCK(linp);
+ }
+ if (ret_buf == NULL) {
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ SCTPDBG(SCTP_DEBUG_INPUT3,
+ "GAK, null buffer\n");
+ *offset = length;
+ return (NULL);
+ }
+ /* if AUTH skipped, see if it verified... */
+ if (auth_skipped) {
+ got_auth = 1;
+ auth_skipped = 0;
+ }
+ if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
+ /*
+ * Restart the timer if we have
+ * pending data
+ */
+ struct sctp_tmit_chunk *chk;
+
+ chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
+ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
+ }
+ }
+ break;
+ case SCTP_COOKIE_ACK:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb);
+ if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+ /* We are not interested anymore */
+ if ((stcb) && (stcb->asoc.total_output_queue_size)) {
+ ;
+ } else if (stcb) {
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(inp);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ *offset = length;
+ return (NULL);
+ }
+ }
+ /* He's alive so give him credit */
+ if ((stcb) && netp && *netp) {
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch,stcb, *netp);
+ }
+ break;
+ case SCTP_ECN_ECHO:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n");
+ /* He's alive so give him credit */
+ if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ if (stcb) {
+ if (stcb->asoc.ecn_supported == 0) {
+ goto unknown_chunk;
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch,
+ stcb);
+ ecne_seen = 1;
+ }
+ break;
+ case SCTP_ECN_CWR:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n");
+ /* He's alive so give him credit */
+ if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ if (stcb) {
+ if (stcb->asoc.ecn_supported == 0) {
+ goto unknown_chunk;
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
+ }
+ break;
+ case SCTP_SHUTDOWN_COMPLETE:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb);
+ /* must be first and only chunk */
+ if ((num_chunks > 1) ||
+ (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+ *offset = length;
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ return (NULL);
+ }
+ if ((stcb) && netp && *netp) {
+ sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
+ stcb, *netp);
+ }
+ *offset = length;
+ return (NULL);
+ break;
+ case SCTP_ASCONF:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
+ /* He's alive so give him credit */
+ if (stcb) {
+ if (stcb->asoc.asconf_supported == 0) {
+ goto unknown_chunk;
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_asconf(m, *offset, src,
+ (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
+ asconf_cnt++;
+ }
+ break;
+ case SCTP_ASCONF_ACK:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n");
+ if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ if ((stcb) && netp && *netp) {
+ if (stcb->asoc.asconf_supported == 0) {
+ goto unknown_chunk;
+ }
+ /* He's alive so give him credit */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_asconf_ack(m, *offset,
+ (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
+ if (abort_no_unlock)
+ return (NULL);
+ }
+ break;
+ case SCTP_FORWARD_CUM_TSN:
+ case SCTP_IFORWARD_CUM_TSN:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n");
+ if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+
+ /* He's alive so give him credit */
+ if (stcb) {
+ int abort_flag = 0;
+
+ if (stcb->asoc.prsctp_supported == 0) {
+ goto unknown_chunk;
+ }
+ stcb->asoc.overall_error_count = 0;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ *fwd_tsn_seen = 1;
+ if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+ /* We are not interested anymore */
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ so = SCTP_INP_SO(inp);
+ atomic_add_int(&stcb->asoc.refcnt, 1);
+ SCTP_TCB_UNLOCK(stcb);
+ SCTP_SOCKET_LOCK(so, 1);
+ SCTP_TCB_LOCK(stcb);
+ atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+ (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+ SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+ SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+ *offset = length;
+ return (NULL);
+ }
+ /*
+ * For sending a SACK this looks like DATA
+ * chunks.
+ */
+ stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
+ sctp_handle_forward_tsn(stcb,
+ (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
+ if (abort_flag) {
+ *offset = length;
+ return (NULL);
+ } else {
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ }
+
+ }
+ break;
+ case SCTP_STREAM_RESET:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
+ if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ if (stcb->asoc.reconfig_supported == 0) {
+ goto unknown_chunk;
+ }
+ if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
+ /* stop processing */
+ *offset = length;
+ return (NULL);
+ }
+ break;
+ case SCTP_PACKET_DROPPED:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
+ /* re-get it all please */
+ if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+
+
+ if (ch && (stcb) && netp && (*netp)) {
+ if (stcb->asoc.pktdrop_supported == 0) {
+ goto unknown_chunk;
+ }
+ sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
+ stcb, *netp,
+ min(chk_length, (sizeof(chunk_buf) - 4)));
+
+ }
+
+ break;
+ case SCTP_AUTHENTICATION:
+ SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
+ if (stcb == NULL) {
+ /* save the first AUTH for later processing */
+ if (auth_skipped == 0) {
+ auth_offset = *offset;
+ auth_len = chk_length;
+ auth_skipped = 1;
+ }
+ /* skip this chunk (temporarily) */
+ goto next_chunk;
+ }
+ if (stcb->asoc.auth_supported == 0) {
+ goto unknown_chunk;
+ }
+ if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
+ (chk_length > (sizeof(struct sctp_auth_chunk) +
+ SCTP_AUTH_DIGEST_LEN_MAX))) {
+ /* Its not ours */
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ if (got_auth == 1) {
+ /* skip this chunk... it's already auth'd */
+ goto next_chunk;
+ }
+ got_auth = 1;
+ if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch,
+ m, *offset)) {
+ /* auth HMAC failed so dump the packet */
+ *offset = length;
+ return (stcb);
+ } else {
+ /* remaining chunks are HMAC checked */
+ stcb->asoc.authenticated = 1;
+ }
+ break;
+
+ default:
+ unknown_chunk:
+ /* it's an unknown chunk! */
+ if ((ch->chunk_type & 0x40) && (stcb != NULL)) {
+ struct sctp_gen_error_cause *cause;
+ int len;
+
+ op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
+ 0, M_NOWAIT, 1, MT_DATA);
+ if (op_err != NULL) {
+ len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
+ cause = mtod(op_err, struct sctp_gen_error_cause *);
+ cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
+ cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
+ SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
+ SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
+ if (SCTP_BUF_NEXT(op_err) != NULL) {
+#ifdef SCTP_MBUF_LOGGING
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+ sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
+ }
+#endif
+ sctp_queue_op_err(stcb, op_err);
+ } else {
+ sctp_m_freem(op_err);
+ }
+ }
+ }
+ if ((ch->chunk_type & 0x80) == 0) {
+ /* discard this packet */
+ *offset = length;
+ return (stcb);
+ } /* else skip this bad chunk and continue... */
+ break;
+ } /* switch (ch->chunk_type) */
+
+
+ next_chunk:
+ /* get the next chunk */
+ *offset += SCTP_SIZE32(chk_length);
+ if (*offset >= length) {
+ /* no more data left in the mbuf chain */
+ break;
+ }
+ ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+ sizeof(struct sctp_chunkhdr), chunk_buf);
+ if (ch == NULL) {
+ if (locked_tcb) {
+ SCTP_TCB_UNLOCK(locked_tcb);
+ }
+ *offset = length;
+ return (NULL);
+ }
+ } /* while */
+
+ if (asconf_cnt > 0 && stcb != NULL) {
+ sctp_send_asconf_ack(stcb);
+ }
+ return (stcb);
+}
+
+
+/*
+ * common input chunk processing (v4 and v6)
+ */
+void
+sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
+ struct sockaddr *src, struct sockaddr *dst,
+ struct sctphdr *sh, struct sctp_chunkhdr *ch,
+#if !defined(SCTP_WITH_NO_CSUM)
+ uint8_t compute_crc,
+#endif
+ uint8_t ecn_bits,
+#if defined(__FreeBSD__)
+ uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
+#endif
+ uint32_t vrf_id, uint16_t port)
+{
+ uint32_t high_tsn;
+ int fwd_tsn_seen = 0, data_processed = 0;
+ struct mbuf *m = *mm, *op_err;
+ char msg[SCTP_DIAG_INFO_LEN];
+ int un_sent;
+ int cnt_ctrl_ready = 0;
+ struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
+ struct sctp_tcb *stcb = NULL;
+ struct sctp_nets *net = NULL;
+#if defined(__Userspace__)
+ struct socket *upcall_socket = NULL;
+#endif
+ SCTP_STAT_INCR(sctps_recvdatagrams);
+#ifdef SCTP_AUDITING_ENABLED
+ sctp_audit_log(0xE0, 1);
+ sctp_auditing(0, inp, stcb, net);
+#endif
+#if !defined(SCTP_WITH_NO_CSUM)
+ if (compute_crc != 0) {
+ uint32_t check, calc_check;
+
+ check = sh->checksum;
+ sh->checksum = 0;
+ calc_check = sctp_calculate_cksum(m, iphlen);
+ sh->checksum = check;
+ if (calc_check != check) {
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n",
+ calc_check, check, (void *)m, length, iphlen);
+ stcb = sctp_findassociation_addr(m, offset, src, dst,
+ sh, ch, &inp, &net, vrf_id);
+#if defined(INET) || defined(INET6)
+ if ((ch->chunk_type != SCTP_INITIATION) &&
+ (net != NULL) && (net->port != port)) {
+ if (net->port == 0) {
+ /* UDP encapsulation turned on. */
+ net->mtu -= sizeof(struct udphdr);
+ if (stcb->asoc.smallest_mtu > net->mtu) {
+ sctp_pathmtu_adjustment(stcb, net->mtu);
+ }
+ } else if (port == 0) {
+ /* UDP encapsulation turned off. */
+ net->mtu += sizeof(struct udphdr);
+ /* XXX Update smallest_mtu */
+ }
+ net->port = port;
+ }
+#endif
+#if defined(__FreeBSD__)
+ if (net != NULL) {
+ net->flowtype = mflowtype;
+ net->flowid = mflowid;
+ }
+#endif
+ if ((inp != NULL) && (stcb != NULL)) {
+ sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
+ sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
+ } else if ((inp != NULL) && (stcb == NULL)) {
+ inp_decr = inp;
+ }
+ SCTP_STAT_INCR(sctps_badsum);
+ SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
+ goto out;
+ }
+ }
+#endif
+ /* Destination port of 0 is illegal, based on RFC4960. */
+ if (sh->dest_port == 0) {
+ SCTP_STAT_INCR(sctps_hdrops);
+ goto out;
+ }
+ stcb = sctp_findassociation_addr(m, offset, src, dst,
+ sh, ch, &inp, &net, vrf_id);
+#if defined(INET) || defined(INET6)
+ if ((ch->chunk_type != SCTP_INITIATION) &&
+ (net != NULL) && (net->port != port)) {
+ if (net->port == 0) {
+ /* UDP encapsulation turned on. */
+ net->mtu -= sizeof(struct udphdr);
+ if (stcb->asoc.smallest_mtu > net->mtu) {
+ sctp_pathmtu_adjustment(stcb, net->mtu);
+ }
+ } else if (port == 0) {
+ /* UDP encapsulation turned off. */
+ net->mtu += sizeof(struct udphdr);
+ /* XXX Update smallest_mtu */
+ }
+ net->port = port;
+ }
+#endif
+#if defined(__FreeBSD__)
+ if (net != NULL) {
+ net->flowtype = mflowtype;
+ net->flowid = mflowid;
+ }
+#endif
+ if (inp == NULL) {
+ SCTP_STAT_INCR(sctps_noport);
+#if defined(__FreeBSD__) && (((__FreeBSD_version < 900000) && (__FreeBSD_version >= 804000)) || (__FreeBSD_version > 900000))
+ if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
+ goto out;
+ }
+#endif
+ if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
+ sctp_send_shutdown_complete2(src, dst, sh,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ goto out;
+ }
+ if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
+ goto out;
+ }
+ if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
+ if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
+ ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
+ (ch->chunk_type != SCTP_INIT))) {
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ "Out of the blue");
+ sctp_send_abort(m, iphlen, src, dst,
+ sh, 0, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ }
+ }
+ goto out;
+ } else if (stcb == NULL) {
+ inp_decr = inp;
+ }
+#ifdef IPSEC
+ /*-
+ * I very much doubt any of the IPSEC stuff will work but I have no
+ * idea, so I will leave it in place.
+ */
+ if (inp != NULL) {
+ switch (dst->sa_family) {
+#ifdef INET
+ case AF_INET:
+ if (ipsec4_in_reject(m, &inp->ip_inp.inp)) {
+ SCTP_STAT_INCR(sctps_hdrops);
+ goto out;
+ }
+ break;
+#endif
+#ifdef INET6
+ case AF_INET6:
+ if (ipsec6_in_reject(m, &inp->ip_inp.inp)) {
+ SCTP_STAT_INCR(sctps_hdrops);
+ goto out;
+ }
+ break;
+#endif
+ default:
+ break;
+ }
+ }
+#endif
+ SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
+ (void *)m, iphlen, offset, length, (void *)stcb);
+ if (stcb) {
+ /* always clear this before beginning a packet */
+ stcb->asoc.authenticated = 0;
+ stcb->asoc.seen_a_sack_this_pkt = 0;
+ SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
+ (void *)stcb, stcb->asoc.state);
+
+ if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
+ (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
+ /*-
+ * If we hit here, we had a ref count
+ * up when the assoc was aborted and the
+ * timer is clearing out the assoc, we should
+ * NOT respond to any packet.. its OOTB.
+ */
+ SCTP_TCB_UNLOCK(stcb);
+ stcb = NULL;
+ snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ msg);
+ sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, port);
+ goto out;
+ }
+
+ }
+#if defined(__Userspace__)
+ if (stcb && !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
+ if (stcb->sctp_socket != NULL) {
+ if (stcb->sctp_socket->so_head != NULL) {
+ upcall_socket = stcb->sctp_socket->so_head;
+ } else {
+ upcall_socket = stcb->sctp_socket;
+ }
+ SOCK_LOCK(upcall_socket);
+ soref(upcall_socket);
+ SOCK_UNLOCK(upcall_socket);
+ }
+ }
+#endif
+ if (IS_SCTP_CONTROL(ch)) {
+ /* process the control portion of the SCTP packet */
+ /* sa_ignore NO_NULL_CHK */
+ stcb = sctp_process_control(m, iphlen, &offset, length,
+ src, dst, sh, ch,
+ inp, stcb, &net, &fwd_tsn_seen,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ if (stcb) {
+ /* This covers us if the cookie-echo was there
+ * and it changes our INP.
+ */
+ inp = stcb->sctp_ep;
+#if defined(INET) || defined(INET6)
+ if ((ch->chunk_type != SCTP_INITIATION) &&
+ (net != NULL) && (net->port != port)) {
+ if (net->port == 0) {
+ /* UDP encapsulation turned on. */
+ net->mtu -= sizeof(struct udphdr);
+ if (stcb->asoc.smallest_mtu > net->mtu) {
+ sctp_pathmtu_adjustment(stcb, net->mtu);
+ }
+ } else if (port == 0) {
+ /* UDP encapsulation turned off. */
+ net->mtu += sizeof(struct udphdr);
+ /* XXX Update smallest_mtu */
+ }
+ net->port = port;
+ }
+#endif
+ }
+ } else {
+ /*
+ * no control chunks, so pre-process DATA chunks (these
+ * checks are taken care of by control processing)
+ */
+
+ /*
+ * if DATA only packet, and auth is required, then punt...
+ * can't have authenticated without any AUTH (control)
+ * chunks
+ */
+ if ((stcb != NULL) &&
+ (stcb->asoc.auth_supported == 1) &&
+ sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
+ /* "silently" ignore */
+ SCTP_STAT_INCR(sctps_recvauthmissing);
+ goto out;
+ }
+ if (stcb == NULL) {
+ /* out of the blue DATA chunk */
+ snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ msg);
+ sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ goto out;
+ }
+ if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
+ /* v_tag mismatch! */
+ SCTP_STAT_INCR(sctps_badvtag);
+ goto out;
+ }
+ }
+
+ if (stcb == NULL) {
+ /*
+ * no valid TCB for this packet, or we found it's a bad
+ * packet while processing control, or we're done with this
+ * packet (done or skip rest of data), so we drop it...
+ */
+ goto out;
+ }
+#if defined(__Userspace__)
+ if (stcb && upcall_socket == NULL && !(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
+ if (stcb->sctp_socket != NULL) {
+ if (stcb->sctp_socket->so_head != NULL) {
+ upcall_socket = stcb->sctp_socket->so_head;
+ } else {
+ upcall_socket = stcb->sctp_socket;
+ }
+ SOCK_LOCK(upcall_socket);
+ soref(upcall_socket);
+ SOCK_UNLOCK(upcall_socket);
+ }
+ }
+#endif
+ /*
+ * DATA chunk processing
+ */
+ /* plow through the data chunks while length > offset */
+
+ /*
+ * Rest should be DATA only. Check authentication state if AUTH for
+ * DATA is required.
+ */
+ if ((length > offset) &&
+ (stcb != NULL) &&
+ (stcb->asoc.auth_supported == 1) &&
+ sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
+ !stcb->asoc.authenticated) {
+ /* "silently" ignore */
+ SCTP_STAT_INCR(sctps_recvauthmissing);
+ SCTPDBG(SCTP_DEBUG_AUTH1,
+ "Data chunk requires AUTH, skipped\n");
+ goto trigger_send;
+ }
+ if (length > offset) {
+ int retval;
+
+ /*
+ * First check to make sure our state is correct. We would
+ * not get here unless we really did have a tag, so we don't
+ * abort if this happens, just dump the chunk silently.
+ */
+ switch (SCTP_GET_STATE(&stcb->asoc)) {
+ case SCTP_STATE_COOKIE_ECHOED:
+ /*
+ * we consider data with valid tags in this state
+ * shows us the cookie-ack was lost. Imply it was
+ * there.
+ */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+ stcb->asoc.overall_error_count,
+ 0,
+ SCTP_FROM_SCTP_INPUT,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count = 0;
+ sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
+ break;
+ case SCTP_STATE_COOKIE_WAIT:
+ /*
+ * We consider OOTB any data sent during asoc setup.
+ */
+ snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+ op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+ msg);
+ sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, inp->fibnum,
+#endif
+ vrf_id, port);
+ goto out;
+ /*sa_ignore NOTREACHED*/
+ break;
+ case SCTP_STATE_EMPTY: /* should not happen */
+ case SCTP_STATE_INUSE: /* should not happen */
+ case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */
+ case SCTP_STATE_SHUTDOWN_ACK_SENT:
+ default:
+ goto out;
+ /*sa_ignore NOTREACHED*/
+ break;
+ case SCTP_STATE_OPEN:
+ case SCTP_STATE_SHUTDOWN_SENT:
+ break;
+ }
+ /* plow through the data chunks while length > offset */
+ retval = sctp_process_data(mm, iphlen, &offset, length,
+ inp, stcb, net, &high_tsn);
+ if (retval == 2) {
+ /*
+ * The association aborted, NO UNLOCK needed since
+ * the association is destroyed.
+ */
+ stcb = NULL;
+ goto out;
+ }
+ data_processed = 1;
+ /*
+ * Anything important needs to have been m_copy'ed in
+ * process_data
+ */
+ }
+
+ /* take care of ecn */
+ if ((data_processed == 1) &&
+ (stcb->asoc.ecn_supported == 1) &&
+ ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
+ /* Yep, we need to add a ECNE */
+ sctp_send_ecn_echo(stcb, net, high_tsn);
+ }
+
+ if ((data_processed == 0) && (fwd_tsn_seen)) {
+ int was_a_gap;
+ uint32_t highest_tsn;
+
+ if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
+ highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
+ } else {
+ highest_tsn = stcb->asoc.highest_tsn_inside_map;
+ }
+ was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
+ stcb->asoc.send_sack = 1;
+ sctp_sack_check(stcb, was_a_gap);
+ } else if (fwd_tsn_seen) {
+ stcb->asoc.send_sack = 1;
+ }
+ /* trigger send of any chunks in queue... */
+trigger_send:
+#ifdef SCTP_AUDITING_ENABLED
+ sctp_audit_log(0xE0, 2);
+ sctp_auditing(1, inp, stcb, net);
+#endif
+ SCTPDBG(SCTP_DEBUG_INPUT1,
+ "Check for chunk output prw:%d tqe:%d tf=%d\n",
+ stcb->asoc.peers_rwnd,
+ TAILQ_EMPTY(&stcb->asoc.control_send_queue),
+ stcb->asoc.total_flight);
+ un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
+ if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
+ cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
+ }
+ if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
+ cnt_ctrl_ready ||
+ stcb->asoc.trigger_reset ||
+ ((un_sent) &&
+ (stcb->asoc.peers_rwnd > 0 ||
+ (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) {
+ SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
+ sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+ SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
+ }
+#ifdef SCTP_AUDITING_ENABLED
+ sctp_audit_log(0xE0, 3);
+ sctp_auditing(2, inp, stcb, net);
+#endif
+ out:
+ if (stcb != NULL) {
+ SCTP_TCB_UNLOCK(stcb);
+ }
+#if defined(__Userspace__)
+ if (upcall_socket != NULL) {
+ if (upcall_socket->so_upcall != NULL) {
+ (*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT);
+ }
+ ACCEPT_LOCK();
+ SOCK_LOCK(upcall_socket);
+ sorele(upcall_socket);
+ }
+#endif
+ if (inp_decr != NULL) {
+ /* reduce ref-count */
+ SCTP_INP_WLOCK(inp_decr);
+ SCTP_INP_DECR_REF(inp_decr);
+ SCTP_INP_WUNLOCK(inp_decr);
+ }
+ return;
+}
+
+#ifdef INET
+#if !defined(__Userspace__)
+#if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__)
+void
+sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
+#elif defined(__Panda__)
+void
+sctp_input(pakhandle_type i_pak)
+#else
+void
+#if __STDC__
+sctp_input(struct mbuf *i_pak,...)
+#else
+sctp_input(i_pak, va_alist)
+ struct mbuf *i_pak;
+#endif
+#endif
+{
+ struct mbuf *m;
+ int iphlen;
+ uint32_t vrf_id = 0;
+ uint8_t ecn_bits;
+ struct sockaddr_in src, dst;
+ struct ip *ip;
+ struct sctphdr *sh;
+ struct sctp_chunkhdr *ch;
+ int length, offset;
+#if !defined(SCTP_WITH_NO_CSUM)
+ uint8_t compute_crc;
+#endif
+#if defined(__FreeBSD__)
+ uint32_t mflowid;
+ uint8_t mflowtype;
+ uint16_t fibnum;
+#endif
+#if !(defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__))
+ uint16_t port = 0;
+#endif
+
+#if defined(__Panda__)
+ /* This is Evil, but its the only way to make panda work right. */
+ iphlen = sizeof(struct ip);
+#else
+ iphlen = off;
+#endif
+ if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
+ SCTP_RELEASE_PKT(i_pak);
+ return;
+ }
+ m = SCTP_HEADER_TO_CHAIN(i_pak);
+#ifdef __Panda__
+ SCTP_DETACH_HEADER_FROM_CHAIN(i_pak);
+ (void)SCTP_RELEASE_HEADER(i_pak);
+#endif
+#ifdef SCTP_MBUF_LOGGING
+ /* Log in any input mbufs */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+ sctp_log_mbc(m, SCTP_MBUF_INPUT);
+ }
+#endif
+#ifdef SCTP_PACKET_LOGGING
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
+ sctp_packet_log(m);
+ }
+#endif
+#if defined(__FreeBSD__)
+#if __FreeBSD_version > 1000049
+ SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+ "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
+ m->m_pkthdr.len,
+ if_name(m->m_pkthdr.rcvif),
+ (int)m->m_pkthdr.csum_flags, CSUM_BITS);
+#elif __FreeBSD_version >= 800000
+ SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+ "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+ m->m_pkthdr.len,
+ if_name(m->m_pkthdr.rcvif),
+ m->m_pkthdr.csum_flags);
+#else
+ SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+ "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+ m->m_pkthdr.len,
+ m->m_pkthdr.rcvif->if_xname,
+ m->m_pkthdr.csum_flags);
+#endif
+#endif
+#if defined(__APPLE__)
+ SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+ "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
+ m->m_pkthdr.len,
+ m->m_pkthdr.rcvif->if_name,
+ m->m_pkthdr.rcvif->if_unit,
+ m->m_pkthdr.csum_flags);
+#endif
+#if defined(__Windows__)
+ SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+ "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+ m->m_pkthdr.len,
+ m->m_pkthdr.rcvif->if_xname,
+ m->m_pkthdr.csum_flags);
+#endif
+#if defined(__FreeBSD__)
+ mflowid = m->m_pkthdr.flowid;
+ mflowtype = M_HASHTYPE_GET(m);
+ fibnum = M_GETFIB(m);
+#endif
+ SCTP_STAT_INCR(sctps_recvpackets);
+ SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
+ /* Get IP, SCTP, and first chunk header together in the first mbuf. */
+ offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
+ if (SCTP_BUF_LEN(m) < offset) {
+ if ((m = m_pullup(m, offset)) == NULL) {
+ SCTP_STAT_INCR(sctps_hdrops);
+ return;
+ }
+ }
+ ip = mtod(m, struct ip *);
+ sh = (struct sctphdr *)((caddr_t)ip + iphlen);
+ ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
+ offset -= sizeof(struct sctp_chunkhdr);
+ memset(&src, 0, sizeof(struct sockaddr_in));
+ src.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+ src.sin_len = sizeof(struct sockaddr_in);
+#endif
+ src.sin_port = sh->src_port;
+ src.sin_addr = ip->ip_src;
+ memset(&dst, 0, sizeof(struct sockaddr_in));
+ dst.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+ dst.sin_len = sizeof(struct sockaddr_in);
+#endif
+ dst.sin_port = sh->dest_port;
+ dst.sin_addr = ip->ip_dst;
+#if defined(__Windows__)
+ NTOHS(ip->ip_len);
+#endif
+#if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
+ ip->ip_len = ntohs(ip->ip_len);
+#endif
+#if defined(__FreeBSD__)
+#if __FreeBSD_version >= 1000000
+ length = ntohs(ip->ip_len);
+#else
+ length = ip->ip_len + iphlen;
+#endif
+#elif defined(__APPLE__)
+ length = ip->ip_len + iphlen;
+#elif defined(__Userspace__)
+#if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows)
+ length = ip->ip_len;
+#else
+ length = ip->ip_len + iphlen;
+#endif
+#else
+ length = ip->ip_len;
+#endif
+ /* Validate mbuf chain length with IP payload length. */
+ if (SCTP_HEADER_LEN(m) != length) {
+ SCTPDBG(SCTP_DEBUG_INPUT1,
+ "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
+ SCTP_STAT_INCR(sctps_hdrops);
+ goto out;
+ }
+ /* SCTP does not allow broadcasts or multicasts */
+ if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
+ goto out;
+ }
+ if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
+ goto out;
+ }
+ ecn_bits = ip->ip_tos;
+#if defined(SCTP_WITH_NO_CSUM)
+ SCTP_STAT_INCR(sctps_recvnocrc);
+#else
+#if defined(__FreeBSD__) && __FreeBSD_version >= 800000
+ if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
+ SCTP_STAT_INCR(sctps_recvhwcrc);
+ compute_crc = 0;
+ } else {
+#else
+ if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
+ ((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
+ (SCTP_IS_IT_LOOPBACK(m)))) {
+ SCTP_STAT_INCR(sctps_recvnocrc);
+ compute_crc = 0;
+ } else {
+#endif
+ SCTP_STAT_INCR(sctps_recvswcrc);
+ compute_crc = 1;
+ }
+#endif
+ sctp_common_input_processing(&m, iphlen, offset, length,
+ (struct sockaddr *)&src,
+ (struct sockaddr *)&dst,
+ sh, ch,
+#if !defined(SCTP_WITH_NO_CSUM)
+ compute_crc,
+#endif
+ ecn_bits,
+#if defined(__FreeBSD__)
+ mflowtype, mflowid, fibnum,
+#endif
+ vrf_id, port);
+ out:
+ if (m) {
+ sctp_m_freem(m);
+ }
+ return;
+}
+
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+extern int *sctp_cpuarry;
+#endif
+
+#if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
+int
+sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
+{
+ struct mbuf *m;
+ int off;
+
+ m = *mp;
+ off = *offp;
+#else
+void
+sctp_input(struct mbuf *m, int off)
+{
+#endif
+#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP)
+ if (mp_ncpus > 1) {
+ struct ip *ip;
+ struct sctphdr *sh;
+ int offset;
+ int cpu_to_use;
+ uint32_t flowid, tag;
+
+ if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
+ flowid = m->m_pkthdr.flowid;
+ } else {
+ /* No flow id built by lower layers
+ * fix it so we create one.
+ */
+ offset = off + sizeof(struct sctphdr);
+ if (SCTP_BUF_LEN(m) < offset) {
+ if ((m = m_pullup(m, offset)) == NULL) {
+ SCTP_STAT_INCR(sctps_hdrops);
+#if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
+ return (IPPROTO_DONE);
+#else
+ return;
+#endif
+ }
+ }
+ ip = mtod(m, struct ip *);
+ sh = (struct sctphdr *)((caddr_t)ip + off);
+ tag = htonl(sh->v_tag);
+ flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
+ m->m_pkthdr.flowid = flowid;
+ M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
+ }
+ cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
+ sctp_queue_to_mcore(m, off, cpu_to_use);
+#if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
+ return (IPPROTO_DONE);
+#else
+ return;
+#endif
+ }
+#endif
+ sctp_input_with_port(m, off, 0);
+#if defined(__FreeBSD__) && __FreeBSD_version >= 1100020
+ return (IPPROTO_DONE);
+#endif
+}
+#endif
+#endif