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IP6 multicast support (untested)

This commit is contained in:
M66B 2016-02-03 08:47:10 +01:00
parent 1b7e0966e7
commit df32990789
1 changed files with 23 additions and 12 deletions
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35
app/src/main/jni/netguard/netguard.c
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@ -2343,27 +2343,38 @@ int open_udp_socket(const struct arguments *args, const struct udp_session *cur)
if (protect_socket(args, sock) < 0)
return -1;
// Check for broadcast
// Check for broadcast/multicast
if (cur->version == 4) {
uint32_t broadcast4 = INADDR_BROADCAST;
if (memcmp(&cur->daddr.ip4, &broadcast4, sizeof(broadcast4)) == 0) {
log_android(ANDROID_LOG_WARN, "UDP broadcast");
log_android(ANDROID_LOG_WARN, "UDP4 broadcast");
int on = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)))
log_android(ANDROID_LOG_ERROR, "UDP setsockopt SO_BROADCAST error %d: %s",
errno, strerror(errno));
}
} else {
// TODO IPv6 broadcast
// ffX2::0/16
/*
struct ipv6_mreq mreq6;
mreq6->ipv6mr_multiaddr;
mreq6->ipv6mr_ifindex;
if (setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char *) &mreq6, sizeof(mreq6)))
log_android(ANDROID_LOG_ERROR, "UDP setsockopt IPV6_ADD_MEMBERSHIP error %d: %s",
errno, strerror(errno));
*/
// http://man7.org/linux/man-pages/man7/ipv6.7.html
if (*((uint8_t *) &cur->daddr.ip6) == 0xFF) {
log_android(ANDROID_LOG_WARN, "UDP6 broadcast");
int loop = 1; // true
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)))
log_android(ANDROID_LOG_ERROR, "UDP setsockopt IPV6_MULTICAST_LOOP error %d: %s",
errno, strerror(errno));
int ttl = -1; // route default
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)))
log_android(ANDROID_LOG_ERROR, "UDP setsockopt IPV6_MULTICAST_HOPS error %d: %s",
errno, strerror(errno));
struct ipv6_mreq mreq6;
memcpy(&mreq6.ipv6mr_multiaddr, &cur->daddr.ip6, sizeof(struct in6_addr));
mreq6.ipv6mr_interface = INADDR_ANY;
if (setsockopt(sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)))
log_android(ANDROID_LOG_ERROR, "UDP setsockopt IPV6_ADD_MEMBERSHIP error %d: %s",
errno, strerror(errno));
}
}
return sock;