| James Kuszmaul | 82f6c04 | 2021-01-17 11:30:16 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file mcast.c UDP Multicast |
| 3 | * |
| 4 | * Copyright (C) 2010 Creytiv.com |
| 5 | */ |
| 6 | |
| 7 | #define _BSD_SOURCE 1 |
| 8 | #define _DEFAULT_SOURCE 1 |
| 9 | #include <re_types.h> |
| 10 | #include <re_fmt.h> |
| 11 | #include <re_sa.h> |
| 12 | #include <re_udp.h> |
| 13 | |
| 14 | |
| 15 | static int multicast_update(struct udp_sock *us, const struct sa *group, |
| 16 | bool join) |
| 17 | { |
| 18 | struct ip_mreq mreq; |
| 19 | #ifdef HAVE_INET6 |
| 20 | struct ipv6_mreq mreq6; |
| 21 | #endif |
| 22 | int err; |
| 23 | |
| 24 | if (!us || !group) |
| 25 | return EINVAL; |
| 26 | |
| 27 | switch (sa_af(group)) { |
| 28 | |
| 29 | case AF_INET: |
| 30 | mreq.imr_multiaddr = group->u.in.sin_addr; |
| 31 | mreq.imr_interface.s_addr = 0; |
| 32 | |
| 33 | err = udp_setsockopt(us, IPPROTO_IP, |
| 34 | join |
| 35 | ? IP_ADD_MEMBERSHIP |
| 36 | : IP_DROP_MEMBERSHIP, |
| 37 | &mreq, sizeof(mreq)); |
| 38 | break; |
| 39 | |
| 40 | #ifdef HAVE_INET6 |
| 41 | case AF_INET6: |
| 42 | mreq6.ipv6mr_multiaddr = group->u.in6.sin6_addr; |
| 43 | mreq6.ipv6mr_interface = 0; |
| 44 | |
| 45 | err = udp_setsockopt(us, IPPROTO_IPV6, |
| 46 | join |
| 47 | ? IPV6_JOIN_GROUP |
| 48 | : IPV6_LEAVE_GROUP, |
| 49 | &mreq6, sizeof(mreq6)); |
| 50 | break; |
| 51 | #endif |
| 52 | |
| 53 | default: |
| 54 | return EAFNOSUPPORT; |
| 55 | } |
| 56 | |
| 57 | return err; |
| 58 | } |
| 59 | |
| 60 | |
| 61 | int udp_multicast_join(struct udp_sock *us, const struct sa *group) |
| 62 | { |
| 63 | return multicast_update(us, group, true); |
| 64 | } |
| 65 | |
| 66 | |
| 67 | int udp_multicast_leave(struct udp_sock *us, const struct sa *group) |
| 68 | { |
| 69 | return multicast_update(us, group, false); |
| 70 | } |