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authorNivedita Singhvi <niv@us.ibm.com>2009-05-28 11:00:46 +0400
committerDavid S. Miller <davem@davemloft.net>2009-06-02 11:45:24 +0400
commitf771bef98004d9d141b085d987a77d06669d4f4f (patch)
treedf9b7a353a8c28e71a8237d3ad65ba7f41ffab30 /net/ipv4/ip_sockglue.c
parent4d52cfbef6266092d535237ba5a4b981458ab171 (diff)
downloadlinux-f771bef98004d9d141b085d987a77d06669d4f4f.tar.xz
ipv4: New multicast-all socket option
After some discussion offline with Christoph Lameter and David Stevens regarding multicast behaviour in Linux, I'm submitting a slightly modified patch from the one Christoph submitted earlier. This patch provides a new socket option IP_MULTICAST_ALL. In this case, default behaviour is _unchanged_ from the current Linux standard. The socket option is set by default to provide original behaviour. Sockets wishing to receive data only from multicast groups they join explicitly will need to clear this socket option. Signed-off-by: Nivedita Singhvi <niv@us.ibm.com> Signed-off-by: Christoph Lameter<cl@linux.com> Acked-by: David Stevens <dlstevens@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 21b0187123d6..cb49936856e0 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -453,6 +453,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
(1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
optname == IP_MULTICAST_TTL ||
+ optname == IP_MULTICAST_ALL ||
optname == IP_MULTICAST_LOOP ||
optname == IP_RECVORIGDSTADDR) {
if (optlen >= sizeof(int)) {
@@ -898,6 +899,13 @@ mc_msf_out:
kfree(gsf);
break;
}
+ case IP_MULTICAST_ALL:
+ if (optlen < 1)
+ goto e_inval;
+ if (val != 0 && val != 1)
+ goto e_inval;
+ inet->mc_all = val;
+ break;
case IP_ROUTER_ALERT:
err = ip_ra_control(sk, val ? 1 : 0, NULL);
break;
@@ -1151,6 +1159,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
release_sock(sk);
return err;
}
+ case IP_MULTICAST_ALL:
+ val = inet->mc_all;
+ break;
case IP_PKTOPTIONS:
{
struct msghdr msg;