[PATCH net-next v3 5/9] net: fix raw socket lookup device bind matching with VRFs

[Mike Manning <mmanning@vyatta.att-mail.com>]

From: Duncan Eastoe <deastoe@vyatta.att-mail.com>

When there exist a pair of raw sockets one unbound and one bound
to a VRF but equal in all other respects, when a packet is received
in the VRF context, __raw_v4_lookup() matches on both sockets.

This results in the packet being delivered over both sockets,
instead of only the raw socket bound to the VRF. The bound device
checks in __raw_v4_lookup() are replaced with a call to
raw_sk_bound_dev_eq() which correctly handles whether the packet
should be delivered over the unbound socket in such cases.

In __raw_v6_lookup() the match on the device binding of the socket is
similarly updated to use raw_sk_bound_dev_eq() which matches the
handling in __raw_v4_lookup().

Importantly raw_sk_bound_dev_eq() takes the raw_l3mdev_accept sysctl
into account.

Signed-off-by: Duncan Eastoe <deastoe@vyatta.att-mail.com>
Signed-off-by: Mike Manning <mmanning@vyatta.att-mail.com>
---
 include/net/raw.h | 12 ++++++++++++
 net/ipv4/raw.c    |  3 +--
 net/ipv6/raw.c    |  5 ++---
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/include/net/raw.h b/include/net/raw.h
index 9c9fa98a91a4..ce88fdd68933 100644
--- a/include/net/raw.h
+++ b/include/net/raw.h
@@ -18,6 +18,7 @@
 #define _RAW_H
 
 
+#include <net/inet_sock.h>
 #include <net/protocol.h>
 #include <linux/icmp.h>
 
@@ -74,4 +75,15 @@ static inline struct raw_sock *raw_sk(const struct sock *sk)
 	return (struct raw_sock *)sk;
 }
 
+static inline bool raw_sk_bound_dev_eq(struct net *net, int bound_dev_if,
+				       int dif, int sdif)
+{
+#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
+	return inet_bound_dev_eq(net->ipv4.sysctl_raw_l3mdev_accept,
+				 bound_dev_if, dif, sdif);
+#else
+	return inet_bound_dev_eq(1, bound_dev_if, dif, sdif);
+#endif
+}
+
 #endif	/* _RAW_H */
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 8ca3eb06ba04..61f3559407a6 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -131,8 +131,7 @@ struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 		if (net_eq(sock_net(sk), net) && inet->inet_num == num	&&
 		    !(inet->inet_daddr && inet->inet_daddr != raddr) 	&&
 		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
-		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
-		      sk->sk_bound_dev_if != sdif))
+		    raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
 			goto found; /* gotcha */
 	}
 	sk = NULL;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 413d98bf24f4..86978784fbb5 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -86,9 +86,8 @@ struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
 			    !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
 				continue;
 
-			if (sk->sk_bound_dev_if &&
-			    sk->sk_bound_dev_if != dif &&
-			    sk->sk_bound_dev_if != sdif)
+			if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
+						 dif, sdif))
 				continue;
 
 			if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
-- 
2.11.0