From 8cdaaa15da58806ac3c75d96c40aef9e31445a25 Mon Sep 17 00:00:00 2001 From: David L Stevens Date: Fri, 8 Jul 2005 17:39:23 -0700 Subject: [IPV4]: multicast API "join" issues 1) Changes IP_ADD_SOURCE_MEMBERSHIP and MCAST_JOIN_SOURCE_GROUP to ignore EADDRINUSE errors on a "courtesy join" -- prior membership or not is ok for these. 2) Adds "leave group" equivalence of (INCLUDE, empty) filters in the delta-based API. Without this, mixing delta-based API calls that end in an (INCLUDE, empty) filter would not allow a subsequent regular IP_ADD_MEMBERSHIP. It also frees socket buffer memory that isn't needed for both the multicast group record and source filter. Signed-off-by: David L Stevens Signed-off-by: David S. Miller --- net/ipv4/igmp.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/ipv4/igmp.c') diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index 111eb678cbac..e21ebe759907 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1724,6 +1724,7 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct struct in_device *in_dev = NULL; struct inet_sock *inet = inet_sk(sk); struct ip_sf_socklist *psl; + int leavegroup = 0; int i, j, rv; if (!MULTICAST(addr)) @@ -1775,6 +1776,12 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct if (rv) /* source not found */ goto done; + /* special case - (INCLUDE, empty) == LEAVE_GROUP */ + if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { + leavegroup = 1; + goto done; + } + /* update the interface filter */ ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, &mreqs->imr_sourceaddr, 1); @@ -1831,6 +1838,8 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct &mreqs->imr_sourceaddr, 1); done: rtnl_shunlock(); + if (leavegroup) + return ip_mc_leave_group(sk, &imr); return err; } -- cgit v1.2.3