linux-kernel - [PATCH] Make IP_MULTICAST_ALL and IP

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Date:	Fri, 18 Jul 2014 17:38:23 +0100
From:	Quentin Armitage <quentin@...itage.org.uk>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	"David S.Miller" <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Make IP_MULTICAST_ALL and IP_MSFILTER work on raw sockets

Currently, although IP_MULTICAST_ALL and IP_MSFILTER ioctl calls succeed on
raw sockets, there is no code to implement the functionality on received
packets; it is only implemented for UDP sockets. The raw(7) man page states:
"In addition, all ip(7) IPPROTO_IP socket options valid for datagram sockets
are supported", which implies these ioctls should work on raw sockets.

To fix this, add a call to ip_mc_sf_allow on raw sockets.

This should not break any existing code, since the current position of
not calling ip_mc_sf_filter makes it behave as if neither the IP_MULTICAST_ALL
nor the IP_MSFILTER ioctl had been called. Adding the call to ip_mc_sf_allow
will therefore maintain the current behaviour so long as IP_MULTICAST_ALL and
IP_MSFILTER ioctls are not called. Any code that currently is calling
IP_MULTICAST_ALL or IP_MSFILTER ioctls on raw sockets presumably is wanting
the filter to be applied, although no filtering will currently be occurring.

Signed-off-by: Quentin Armitage <quentin@...itage.org.uk>
---
 net/ipv4/raw.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 2c65160..2e1628c 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -58,6 +58,7 @@
 #include <linux/in_route.h>
 #include <linux/route.h>
 #include <linux/skbuff.h>
+#include <linux/igmp.h>
 #include <net/net_namespace.h>
 #include <net/dst.h>
 #include <net/sock.h>
@@ -174,7 +175,9 @@ static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)

 	while (sk) {
 		delivered = 1;
-		if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
+		if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
+		    ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
+				   skb->dev->ifindex)) {
 			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);

 			/* Not releasing hash table! */
-- 
1.7.7.6

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