diff options
Diffstat (limited to 'net/ipv4/igmp.c')
| -rw-r--r-- | net/ipv4/igmp.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index dbbfa09de4e..7af3146939d 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1849,13 +1849,14 @@ done: int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) { - int err; + int err = 0; struct ip_mreqn imr; u32 addr = msf->imsf_multiaddr; struct ip_mc_socklist *pmc; struct in_device *in_dev; struct inet_sock *inet = inet_sk(sk); struct ip_sf_socklist *newpsl, *psl; + int leavegroup = 0; if (!MULTICAST(addr)) return -EINVAL; @@ -1875,6 +1876,12 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) goto done; } + /* special case - (INCLUDE, empty) == LEAVE_GROUP */ + if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { + leavegroup = 1; + goto done; + } + for (pmc=inet->mc_list; pmc; pmc=pmc->next) { if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && pmc->multi.imr_ifindex == imr.imr_ifindex) @@ -1915,6 +1922,8 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) err = 0; done: rtnl_shunlock(); + if (leavegroup) + err = ip_mc_leave_group(sk, &imr); return err; } |