Merge branch 'net-l3mdev-Support-for-sockets-bound-to-enslaved-device'

David Ahern says:

====================
net: l3mdev: Support for sockets bound to enslaved device

A missing piece to the VRF puzzle is the ability to bind sockets to
devices enslaved to a VRF. This patch set adds the enslaved device
index, sdif, to IPv4 and IPv6 socket lookups. The end result for users
is the following scope options for services:

1. "global" services - sockets not bound to any device

   Allows 1 service to work across all network interfaces with
   connected sockets bound to the VRF the connection originates
   (Requires net.ipv4.tcp_l3mdev_accept=1 for TCP and
    net.ipv4.udp_l3mdev_accept=1 for UDP)

2. "VRF" local services - sockets bound to a VRF

   Sockets work across all network interfaces enslaved to a VRF but
   are limited to just the one VRF.

3. "device" services - sockets bound to a specific network interface

   Service works only through the one specific interface.

v3
- convert __inet_lookup_established in dccp_v4_err; missed in v2

v2
- remove sk_lookup struct and add sdif as an argument to existing
  functions

Changes since RFC:
- no significant logic changes; mainly whitespace cleanups
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 6 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index b0bb5d0a30bd..33b70bfd1122 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -122,7 +122,8 @@ void raw_unhash_sk(struct sock *sk)
 EXPORT_SYMBOL_GPL(raw_unhash_sk);
 
 struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
-		unsigned short num, __be32 raddr, __be32 laddr, int dif)
+			     unsigned short num, __be32 raddr, __be32 laddr,
+			     int dif, int sdif)
 {
 	sk_for_each_from(sk) {
 		struct inet_sock *inet = inet_sk(sk);
@@ -130,7 +131,8 @@ 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 && sk->sk_bound_dev_if != dif &&
+		      sk->sk_bound_dev_if != sdif))
 			goto found; /* gotcha */
 	}
 	sk = NULL;
@@ -171,6 +173,7 @@ static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
  */
 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 {
+	int sdif = inet_sdif(skb);
 	struct sock *sk;
 	struct hlist_head *head;
 	int delivered = 0;
@@ -184,13 +187,13 @@ static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 	net = dev_net(skb->dev);
 	sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 			     iph->saddr, iph->daddr,
-			     skb->dev->ifindex);
+			     skb->dev->ifindex, sdif);
 
 	while (sk) {
 		delivered = 1;
 		if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
 		    ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
-				   skb->dev->ifindex)) {
+				   skb->dev->ifindex, sdif)) {
 			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 
 			/* Not releasing hash table! */
@@ -199,7 +202,7 @@ static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 		}
 		sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 				     iph->saddr, iph->daddr,
-				     skb->dev->ifindex);
+				     skb->dev->ifindex, sdif);
 	}
 out:
 	read_unlock(&raw_v4_hashinfo.lock);
@@ -297,12 +300,15 @@ void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 	read_lock(&raw_v4_hashinfo.lock);
 	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 	if (raw_sk) {
+		int dif = skb->dev->ifindex;
+		int sdif = inet_sdif(skb);
+
 		iph = (const struct iphdr *)skb->data;
 		net = dev_net(skb->dev);
 
 		while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
 						iph->daddr, iph->saddr,
-						skb->dev->ifindex)) != NULL) {
+						dif, sdif)) != NULL) {
 			raw_err(raw_sk, skb, info);
 			raw_sk = sk_next(raw_sk);
 			iph = (const struct iphdr *)skb->data;