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, 8 insertions, 5 deletions

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 60be012fe708..e4462b0ff801 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -72,7 +72,7 @@ EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
 
 struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
 		unsigned short num, const struct in6_addr *loc_addr,
-		const struct in6_addr *rmt_addr, int dif)
+		const struct in6_addr *rmt_addr, int dif, int sdif)
 {
 	bool is_multicast = ipv6_addr_is_multicast(loc_addr);
 
@@ -86,7 +86,9 @@ 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)
+			if (sk->sk_bound_dev_if &&
+			    sk->sk_bound_dev_if != dif &&
+			    sk->sk_bound_dev_if != sdif)
 				continue;
 
 			if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
@@ -178,7 +180,8 @@ static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 		goto out;
 
 	net = dev_net(skb->dev);
-	sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, inet6_iif(skb));
+	sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
+			     inet6_iif(skb), inet6_sdif(skb));
 
 	while (sk) {
 		int filtered;
@@ -222,7 +225,7 @@ static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 			}
 		}
 		sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
-				     inet6_iif(skb));
+				     inet6_iif(skb), inet6_sdif(skb));
 	}
 out:
 	read_unlock(&raw_v6_hashinfo.lock);
@@ -378,7 +381,7 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 		net = dev_net(skb->dev);
 
 		while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
-						inet6_iif(skb)))) {
+					     inet6_iif(skb), inet6_iif(skb)))) {
 			rawv6_err(sk, skb, NULL, type, code,
 					inner_offset, info);
 			sk = sk_next(sk);