diff options
| author | Lennart Poettering <lennart@poettering.net> | 2014-08-01 19:48:02 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2014-08-01 20:27:27 +0200 |
| commit | 7b4c2ee75faf08b7a415337b46efc670f986128a (patch) | |
| tree | ecf7889f28ecd369c8c155223b73f937b3e71712 | |
| parent | 747c0ff5648b707abb601f58eefcfd92a7d41695 (diff) | |
resolved: always drop multicast membership before adding one
This is apparently necessary on some devices, such as veth.
| -rw-r--r-- | src/resolve/resolved-dns-scope.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c index 291d0356be..8d03049c10 100644 --- a/src/resolve/resolved-dns-scope.c +++ b/src/resolve/resolved-dns-scope.c @@ -353,6 +353,12 @@ int dns_scope_llmnr_membership(DnsScope *s, bool b) { if (fd < 0) return fd; + /* Always first try to drop membership before we add + * one. This is necessary on some devices, such as + * veth. */ + if (b) + setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)); + if (setsockopt(fd, IPPROTO_IP, b ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP, &mreqn, sizeof(mreqn)) < 0) return -errno; @@ -366,6 +372,9 @@ int dns_scope_llmnr_membership(DnsScope *s, bool b) { if (fd < 0) return fd; + if (b) + setsockopt(fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)); + if (setsockopt(fd, IPPROTO_IPV6, b ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) return -errno; } else |