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resolved: always drop multicast membership before adding one

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This is apparently necessary on some devices, such as veth.
This commit is contained in:
Lennart Poettering 2014-08-01 19:48:02 +02:00
parent 747c0ff564
commit 7b4c2ee75f
1 changed files with 9 additions and 0 deletions
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9
src/resolve/resolved-dns-scope.c
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@ -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