Merge branch 'vrf-allow-simultaneous-service-instances-in-default-and-other-VRFs'

Mike Manning says:

====================
vrf: allow simultaneous service instances in default and other VRFs

Services currently have to be VRF-aware if they are using an unbound
socket. One cannot have multiple service instances running in the
default and other VRFs for services that are not VRF-aware and listen
on an unbound socket. This is because there is no easy way of isolating
packets received in the default VRF from those arriving in other VRFs.

This series provides this isolation for stream sockets subject to the
existing kernel parameter net.ipv4.tcp_l3mdev_accept not being set,
given that this is documented as allowing a single service instance to
work across all VRF domains. Similarly, net.ipv4.udp_l3mdev_accept is
checked for datagram sockets, and net.ipv4.raw_l3mdev_accept is
introduced for raw sockets. The functionality applies to UDP & TCP
services as well as those using raw sockets, and is for IPv4 and IPv6.

Example of running ssh instances in default and blue VRF:

$ /usr/sbin/sshd -D
$ ip vrf exec vrf-blue /usr/sbin/sshd
$ ss -ta | egrep 'State|ssh'
State   Recv-Q   Send-Q           Local Address:Port       Peer Address:Port
LISTEN  0        128           0.0.0.0%vrf-blue:ssh             0.0.0.0:*
LISTEN  0        128                    0.0.0.0:ssh             0.0.0.0:*
ESTAB   0        0              192.168.122.220:ssh       192.168.122.1:50282
LISTEN  0        128              [::]%vrf-blue:ssh                [::]:*
LISTEN  0        128                       [::]:ssh                [::]:*
ESTAB   0        0           [3000::2]%vrf-blue:ssh           [3000::9]:45896
ESTAB   0        0                    [2000::2]:ssh           [2000::9]:46398

v1:
   - Address Paolo Abeni's comments (patch 4/5)
   - Fix build when CONFIG_NET_L3_MASTER_DEV not defined (patch 1/5)
v2:
   - Address David Aherns' comments (patches 4/5 and 5/5)
   - Remove patches 3/5 and 5/5 from series for individual submissions
   - Include a sysctl for raw sockets as recommended by David Ahern
   - Expand series into 10 patches and provide improved descriptions
v3:
   - Update description for patch 1/10 and remove patch 6/10
v4:
   - Set default to enabled for raw socket sysctl as recommended by David Ahern
v5:
   - Address review comments from David Ahern in patches 2-5
====================

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

13 files changed, 137 insertions, 59 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 080a880a1761..7b304e454a38 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -567,6 +567,8 @@ static int sock_setbindtodevice(struct sock *sk, char __user *optval,
 
 	lock_sock(sk);
 	sk->sk_bound_dev_if = index;
+	if (sk->sk_prot->rehash)
+		sk->sk_prot->rehash(sk);
 	sk_dst_reset(sk);
 	release_sock(sk);
 
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 1fbe2f815474..07749c5b0a50 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1964,6 +1964,8 @@ static int __init inet_init(void)
 	/* Add UDP-Lite (RFC 3828) */
 	udplite4_register();
 
+	raw_init();
+
 	ping_init();
 
 	/*
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 15e7f7915a21..5c63449130d9 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -183,7 +183,9 @@ inet_csk_find_open_port(struct sock *sk, struct inet_bind_bucket **tb_ret, int *
 	int i, low, high, attempt_half;
 	struct inet_bind_bucket *tb;
 	u32 remaining, offset;
+	int l3mdev;
 
+	l3mdev = inet_sk_bound_l3mdev(sk);
 	attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0;
 other_half_scan:
 	inet_get_local_port_range(net, &low, &high);
@@ -219,7 +221,8 @@ other_parity_scan:
 						  hinfo->bhash_size)];
 		spin_lock_bh(&head->lock);
 		inet_bind_bucket_for_each(tb, &head->chain)
-			if (net_eq(ib_net(tb), net) && tb->port == port) {
+			if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
+			    tb->port == port) {
 				if (!inet_csk_bind_conflict(sk, tb, false, false))
 					goto success;
 				goto next_port;
@@ -293,6 +296,9 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 	struct net *net = sock_net(sk);
 	struct inet_bind_bucket *tb = NULL;
 	kuid_t uid = sock_i_uid(sk);
+	int l3mdev;
+
+	l3mdev = inet_sk_bound_l3mdev(sk);
 
 	if (!port) {
 		head = inet_csk_find_open_port(sk, &tb, &port);
@@ -306,11 +312,12 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 					  hinfo->bhash_size)];
 	spin_lock_bh(&head->lock);
 	inet_bind_bucket_for_each(tb, &head->chain)
-		if (net_eq(ib_net(tb), net) && tb->port == port)
+		if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
+		    tb->port == port)
 			goto tb_found;
 tb_not_found:
 	tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
-				     net, head, port);
+				     net, head, port, l3mdev);
 	if (!tb)
 		goto fail_unlock;
 tb_found:
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 411dd7a90046..13890d5bfc34 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -65,12 +65,14 @@ static u32 sk_ehashfn(const struct sock *sk)
 struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 						 struct net *net,
 						 struct inet_bind_hashbucket *head,
-						 const unsigned short snum)
+						 const unsigned short snum,
+						 int l3mdev)
 {
 	struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
 
 	if (tb) {
 		write_pnet(&tb->ib_net, net);
+		tb->l3mdev    = l3mdev;
 		tb->port      = snum;
 		tb->fastreuse = 0;
 		tb->fastreuseport = 0;
@@ -135,6 +137,7 @@ int __inet_inherit_port(const struct sock *sk, struct sock *child)
 			table->bhash_size);
 	struct inet_bind_hashbucket *head = &table->bhash[bhash];
 	struct inet_bind_bucket *tb;
+	int l3mdev;
 
 	spin_lock(&head->lock);
 	tb = inet_csk(sk)->icsk_bind_hash;
@@ -143,6 +146,8 @@ int __inet_inherit_port(const struct sock *sk, struct sock *child)
 		return -ENOENT;
 	}
 	if (tb->port != port) {
+		l3mdev = inet_sk_bound_l3mdev(sk);
+
 		/* NOTE: using tproxy and redirecting skbs to a proxy
 		 * on a different listener port breaks the assumption
 		 * that the listener socket's icsk_bind_hash is the same
@@ -150,12 +155,13 @@ int __inet_inherit_port(const struct sock *sk, struct sock *child)
 		 * create a new bind bucket for the child here. */
 		inet_bind_bucket_for_each(tb, &head->chain) {
 			if (net_eq(ib_net(tb), sock_net(sk)) &&
-			    tb->port == port)
+			    tb->l3mdev == l3mdev && tb->port == port)
 				break;
 		}
 		if (!tb) {
 			tb = inet_bind_bucket_create(table->bind_bucket_cachep,
-						     sock_net(sk), head, port);
+						     sock_net(sk), head, port,
+						     l3mdev);
 			if (!tb) {
 				spin_unlock(&head->lock);
 				return -ENOMEM;
@@ -229,6 +235,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
 {
 	int score = -1;
 	struct inet_sock *inet = inet_sk(sk);
+	bool dev_match;
 
 	if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
 			!ipv6_only_sock(sk)) {
@@ -239,15 +246,12 @@ static inline int compute_score(struct sock *sk, struct net *net,
 				return -1;
 			score += 4;
 		}
-		if (sk->sk_bound_dev_if || exact_dif) {
-			bool dev_match = (sk->sk_bound_dev_if == dif ||
-					  sk->sk_bound_dev_if == sdif);
+		dev_match = inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
+						 dif, sdif);
+		if (!dev_match)
+			return -1;
+		score += 4;
 
-			if (!dev_match)
-				return -1;
-			if (sk->sk_bound_dev_if)
-				score += 4;
-		}
 		if (sk->sk_incoming_cpu == raw_smp_processor_id())
 			score++;
 	}
@@ -675,6 +679,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 	u32 remaining, offset;
 	int ret, i, low, high;
 	static u32 hint;
+	int l3mdev;
 
 	if (port) {
 		head = &hinfo->bhash[inet_bhashfn(net, port,
@@ -693,6 +698,8 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
 		return ret;
 	}
 
+	l3mdev = inet_sk_bound_l3mdev(sk);
+
 	inet_get_local_port_range(net, &low, &high);
 	high++; /* [32768, 60999] -> [32768, 61000[ */
 	remaining = high - low;
@@ -719,7 +726,8 @@ other_parity_scan:
 		 * the established check is already unique enough.
 		 */
 		inet_bind_bucket_for_each(tb, &head->chain) {
-			if (net_eq(ib_net(tb), net) && tb->port == port) {
+			if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev &&
+			    tb->port == port) {
 				if (tb->fastreuse >= 0 ||
 				    tb->fastreuseport >= 0)
 					goto next_port;
@@ -732,7 +740,7 @@ other_parity_scan:
 		}
 
 		tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
-					     net, head, port);
+					     net, head, port, l3mdev);
 		if (!tb) {
 			spin_unlock_bh(&head->lock);
 			return -ENOMEM;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 8ca3eb06ba04..fb1f02015a15 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;
@@ -805,7 +804,7 @@ out:
 	return copied;
 }
 
-static int raw_init(struct sock *sk)
+static int raw_sk_init(struct sock *sk)
 {
 	struct raw_sock *rp = raw_sk(sk);
 
@@ -970,7 +969,7 @@ struct proto raw_prot = {
 	.connect	   = ip4_datagram_connect,
 	.disconnect	   = __udp_disconnect,
 	.ioctl		   = raw_ioctl,
-	.init		   = raw_init,
+	.init		   = raw_sk_init,
 	.setsockopt	   = raw_setsockopt,
 	.getsockopt	   = raw_getsockopt,
 	.sendmsg	   = raw_sendmsg,
@@ -1133,4 +1132,28 @@ void __init raw_proc_exit(void)
 {
 	unregister_pernet_subsys(&raw_net_ops);
 }
+
+static void raw_sysctl_init_net(struct net *net)
+{
+#ifdef CONFIG_NET_L3_MASTER_DEV
+	net->ipv4.sysctl_raw_l3mdev_accept = 1;
+#endif
+}
+
+static int __net_init raw_sysctl_init(struct net *net)
+{
+	raw_sysctl_init_net(net);
+	return 0;
+}
+
+static struct pernet_operations __net_initdata raw_sysctl_ops = {
+	.init	= raw_sysctl_init,
+};
+
+void __init raw_init(void)
+{
+	raw_sysctl_init_net(&init_net);
+	if (register_pernet_subsys(&raw_sysctl_ops))
+		panic("RAW: failed to init sysctl parameters.\n");
+}
 #endif /* CONFIG_PROC_FS */
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 891ed2f91467..ba0fc4b18465 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -602,6 +602,17 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= ipv4_ping_group_range,
 	},
+#ifdef CONFIG_NET_L3_MASTER_DEV
+	{
+		.procname	= "raw_l3mdev_accept",
+		.data		= &init_net.ipv4.sysctl_raw_l3mdev_accept,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &one,
+	},
+#endif
 	{
 		.procname	= "tcp_ecn",
 		.data		= &init_net.ipv4.sysctl_tcp_ecn,
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1976fddb9e00..cf73c9194bb6 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -371,6 +371,7 @@ static int compute_score(struct sock *sk, struct net *net,
 {
 	int score;
 	struct inet_sock *inet;
+	bool dev_match;
 
 	if (!net_eq(sock_net(sk), net) ||
 	    udp_sk(sk)->udp_port_hash != hnum ||
@@ -398,15 +399,11 @@ static int compute_score(struct sock *sk, struct net *net,
 		score += 4;
 	}
 
-	if (sk->sk_bound_dev_if || exact_dif) {
-		bool dev_match = (sk->sk_bound_dev_if == dif ||
-				  sk->sk_bound_dev_if == sdif);
-
-		if (!dev_match)
-			return -1;
-		if (sk->sk_bound_dev_if)
-			score += 4;
-	}
+	dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
+					dif, sdif);
+	if (!dev_match)
+		return -1;
+	score += 4;
 
 	if (sk->sk_incoming_cpu == raw_smp_processor_id())
 		score++;
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 1ede7a16a0be..bde08aa549f3 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -772,6 +772,7 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
 		case IPV6_2292PKTINFO:
 		    {
 			struct net_device *dev = NULL;
+			int src_idx;
 
 			if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
 				err = -EINVAL;
@@ -779,12 +780,15 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
 			}
 
 			src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+			src_idx = src_info->ipi6_ifindex;
 
-			if (src_info->ipi6_ifindex) {
+			if (src_idx) {
 				if (fl6->flowi6_oif &&
-				    src_info->ipi6_ifindex != fl6->flowi6_oif)
+				    src_idx != fl6->flowi6_oif &&
+				    (sk->sk_bound_dev_if != fl6->flowi6_oif ||
+				     !sk_dev_equal_l3scope(sk, src_idx)))
 					return -EINVAL;
-				fl6->flowi6_oif = src_info->ipi6_ifindex;
+				fl6->flowi6_oif = src_idx;
 			}
 
 			addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 3d7c7460a0c5..5eeeba7181a1 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -99,6 +99,7 @@ static inline int compute_score(struct sock *sk, struct net *net,
 				const int dif, const int sdif, bool exact_dif)
 {
 	int score = -1;
+	bool dev_match;
 
 	if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
 	    sk->sk_family == PF_INET6) {
@@ -109,15 +110,12 @@ static inline int compute_score(struct sock *sk, struct net *net,
 				return -1;
 			score++;
 		}
-		if (sk->sk_bound_dev_if || exact_dif) {
-			bool dev_match = (sk->sk_bound_dev_if == dif ||
-					  sk->sk_bound_dev_if == sdif);
+		dev_match = inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
+						 dif, sdif);
+		if (!dev_match)
+			return -1;
+		score++;
 
-			if (!dev_match)
-				return -1;
-			if (sk->sk_bound_dev_if)
-				score++;
-		}
 		if (sk->sk_incoming_cpu == raw_smp_processor_id())
 			score++;
 	}
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 96577e742afd..df58e1100226 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -359,6 +359,8 @@ resubmit_final:
 			}
 		} else if (ipprot->flags & INET6_PROTO_FINAL) {
 			const struct ipv6hdr *hdr;
+			int sdif = inet6_sdif(skb);
+			struct net_device *dev;
 
 			/* Only do this once for first final protocol */
 			have_final = true;
@@ -371,9 +373,19 @@ resubmit_final:
 			skb_postpull_rcsum(skb, skb_network_header(skb),
 					   skb_network_header_len(skb));
 			hdr = ipv6_hdr(skb);
+
+			/* skb->dev passed may be master dev for vrfs. */
+			if (sdif) {
+				dev = dev_get_by_index_rcu(net, sdif);
+				if (!dev)
+					goto discard;
+			} else {
+				dev = skb->dev;
+			}
+
 			if (ipv6_addr_is_multicast(&hdr->daddr) &&
-			    !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
-			    &hdr->saddr) &&
+			    !ipv6_chk_mcast_addr(dev, &hdr->daddr,
+						 &hdr->saddr) &&
 			    !ipv6_is_mld(skb, nexthdr, skb_network_header_len(skb)))
 				goto discard;
 		}
@@ -432,15 +444,32 @@ EXPORT_SYMBOL_GPL(ip6_input);
 
 int ip6_mc_input(struct sk_buff *skb)
 {
+	int sdif = inet6_sdif(skb);
 	const struct ipv6hdr *hdr;
+	struct net_device *dev;
 	bool deliver;
 
 	__IP6_UPD_PO_STATS(dev_net(skb_dst(skb)->dev),
 			 __in6_dev_get_safely(skb->dev), IPSTATS_MIB_INMCAST,
 			 skb->len);
 
+	/* skb->dev passed may be master dev for vrfs. */
+	if (sdif) {
+		rcu_read_lock();
+		dev = dev_get_by_index_rcu(dev_net(skb->dev), sdif);
+		if (!dev) {
+			rcu_read_unlock();
+			kfree_skb(skb);
+			return -ENODEV;
+		}
+	} else {
+		dev = skb->dev;
+	}
+
 	hdr = ipv6_hdr(skb);
-	deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
+	deliver = ipv6_chk_mcast_addr(dev, &hdr->daddr, NULL);
+	if (sdif)
+		rcu_read_unlock();
 
 #ifdef CONFIG_IPV6_MROUTE
 	/*
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 381ce38940ae..973e215c3114 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -486,7 +486,7 @@ sticky_done:
 				retv = -EFAULT;
 				break;
 		}
-		if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
+		if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
 			goto e_inval;
 
 		np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 5e0efd3954e9..aed7eb5c2123 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)) {
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index d2d97d07ef27..a25571c12a8a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -117,6 +117,7 @@ static int compute_score(struct sock *sk, struct net *net,
 {
 	int score;
 	struct inet_sock *inet;
+	bool dev_match;
 
 	if (!net_eq(sock_net(sk), net) ||
 	    udp_sk(sk)->udp_port_hash != hnum ||
@@ -144,15 +145,10 @@ static int compute_score(struct sock *sk, struct net *net,
 		score++;
 	}
 
-	if (sk->sk_bound_dev_if || exact_dif) {
-		bool dev_match = (sk->sk_bound_dev_if == dif ||
-				  sk->sk_bound_dev_if == sdif);
-
-		if (!dev_match)
-			return -1;
-		if (sk->sk_bound_dev_if)
-			score++;
-	}
+	dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif);
+	if (!dev_match)
+		return -1;
+	score++;
 
 	if (sk->sk_incoming_cpu == raw_smp_processor_id())
 		score++;
@@ -641,7 +637,7 @@ drop:
 static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
 				   __be16 loc_port, const struct in6_addr *loc_addr,
 				   __be16 rmt_port, const struct in6_addr *rmt_addr,
-				   int dif, unsigned short hnum)
+				   int dif, int sdif, unsigned short hnum)
 {
 	struct inet_sock *inet = inet_sk(sk);
 
@@ -653,7 +649,7 @@ static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
 	    (inet->inet_dport && inet->inet_dport != rmt_port) ||
 	    (!ipv6_addr_any(&sk->sk_v6_daddr) &&
 		    !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
-	    (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) ||
+	    !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) ||
 	    (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) &&
 		    !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)))
 		return false;
@@ -687,6 +683,7 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
 	unsigned int offset = offsetof(typeof(*sk), sk_node);
 	unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
 	int dif = inet6_iif(skb);
+	int sdif = inet6_sdif(skb);
 	struct hlist_node *node;
 	struct sk_buff *nskb;
 
@@ -701,7 +698,8 @@ start_lookup:
 
 	sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
 		if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
-					    uh->source, saddr, dif, hnum))
+					    uh->source, saddr, dif, sdif,
+					    hnum))
 			continue;
 		/* If zero checksum and no_check is not on for
 		 * the socket then skip it.