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Date: Thu, 28 May 2009 10:00:46 -0700
From: Nivedita Singhvi <niv@...ibm.com>
To: netdev <netdev@...r.kernel.org>
CC: David Stevens <dlstevens@...ibm.com>,
Christoph Lameter <cl@...ux.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] Multicast 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@...ibm.com>
Signed-off-by: Christoph Lameter<cl@...ux.com>
Acked-by: David Stevens <dlstevens@...ibm.com>
diff -urN linux-2.6.29.2/include/linux/in.h linux-2.6.29.2.new/include/linux/in.h
--- linux-2.6.29.2/include/linux/in.h 2009-04-27 13:37:11.000000000 -0400
+++ linux-2.6.29.2.new/include/linux/in.h 2009-05-18 16:22:06.000000000 -0400
@@ -107,6 +107,7 @@
#define MCAST_JOIN_SOURCE_GROUP 46
#define MCAST_LEAVE_SOURCE_GROUP 47
#define MCAST_MSFILTER 48
+#define IP_MULTICAST_ALL 49
#define MCAST_EXCLUDE 0
#define MCAST_INCLUDE 1
diff -urN linux-2.6.29.2/include/net/inet_sock.h linux-2.6.29.2.new/include/net/inet_sock.h
--- linux-2.6.29.2/include/net/inet_sock.h 2009-04-27 13:37:11.000000000 -0400
+++ linux-2.6.29.2.new/include/net/inet_sock.h 2009-05-18 16:22:06.000000000 -0400
@@ -130,7 +130,8 @@
freebind:1,
hdrincl:1,
mc_loop:1,
- transparent:1;
+ transparent:1,
+ mc_all:1;
int mc_index;
__be32 mc_addr;
struct ip_mc_socklist *mc_list;
diff -urN linux-2.6.29.2/net/ipv4/af_inet.c linux-2.6.29.2.new/net/ipv4/af_inet.c
--- linux-2.6.29.2/net/ipv4/af_inet.c 2009-04-27 13:37:11.000000000 -0400
+++ linux-2.6.29.2.new/net/ipv4/af_inet.c 2009-05-18 16:22:06.000000000 -0400
@@ -376,6 +376,7 @@
inet->uc_ttl = -1;
inet->mc_loop = 1;
inet->mc_ttl = 1;
+ inet->mc_all = 1;
inet->mc_index = 0;
inet->mc_list = NULL;
diff -urN linux-2.6.29.2/net/ipv4/igmp.c linux-2.6.29.2.new/net/ipv4/igmp.c
--- linux-2.6.29.2/net/ipv4/igmp.c 2009-04-27 13:37:11.000000000 -0400
+++ linux-2.6.29.2.new/net/ipv4/igmp.c 2009-05-18 16:22:33.000000000 -0400
@@ -2196,7 +2196,7 @@
break;
}
if (!pmc)
- return 1;
+ return inet->mc_all;
psl = pmc->sflist;
if (!psl)
return pmc->sfmode == MCAST_EXCLUDE;
diff -urN linux-2.6.29.2/net/ipv4/ip_sockglue.c linux-2.6.29.2.new/net/ipv4/ip_sockglue.c
--- linux-2.6.29.2/net/ipv4/ip_sockglue.c 2009-04-27 13:37:11.000000000 -0400
+++ linux-2.6.29.2.new/net/ipv4/ip_sockglue.c 2009-05-18 16:22:06.000000000 -0400
@@ -449,6 +449,7 @@
(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)) {
@@ -895,6 +896,13 @@
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;
@@ -1147,6 +1155,9 @@
release_sock(sk);
return err;
}
+ case IP_MULTICAST_ALL:
+ val = inet->mc_all;
+ break;
case IP_PKTOPTIONS:
{
struct msghdr msg;
--
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