Merge branch 'pass_net_through_output_path'

Eric W. Biederman says:

====================
net: Pass net through the output path v2

This is the next installment of my work to pass struct net through the
output path so the code does not need to guess how to figure out which
network namespace it is in, and ultimately routes can have output
devices in another network namespace.

The first patch in this series is a fix for a bug that came in when sk
was passed through the functions in the output path, and as such is
probably a candidate for net.  At the same time my later patches depend
on it so sending the fix separately would be confusing.

The second patch in this series is another fix that for an issue that
came in when sk was passed through the output path.  I don't think it
needs a backport as I don't think anyone uses the path where the code
was incorrect.

The rest of the patchset focuses on the path from xxx_local_out to
dst_output and in the end succeeds in passing sock_net(sk) from the
socket a packet locally originates on to the dst->output function.

Given the size reduction in the code I think this counts as a cleanup as
much as feature work.

There remain a number of helper functions (like ip option processing) to
take care of before the network stack can support destination devices in
other network namespaces but with this set of changes the backbone of
the work is done.
====================

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

33 files changed, 89 insertions, 113 deletions

diff --git a/net/core/dst.c b/net/core/dst.c
index 0771c8cb9307..2a1818065e12 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -144,12 +144,12 @@ loop:
 	mutex_unlock(&dst_gc_mutex);
 }
 
-int dst_discard_sk(struct sock *sk, struct sk_buff *skb)
+int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	kfree_skb(skb);
 	return 0;
 }
-EXPORT_SYMBOL(dst_discard_sk);
+EXPORT_SYMBOL(dst_discard_out);
 
 const u32 dst_default_metrics[RTAX_MAX + 1] = {
 	/* This initializer is needed to force linker to place this variable
@@ -177,7 +177,7 @@ void dst_init(struct dst_entry *dst, struct dst_ops *ops,
 	dst->xfrm = NULL;
 #endif
 	dst->input = dst_discard;
-	dst->output = dst_discard_sk;
+	dst->output = dst_discard_out;
 	dst->error = 0;
 	dst->obsolete = initial_obsolete;
 	dst->header_len = 0;
@@ -224,7 +224,7 @@ static void ___dst_free(struct dst_entry *dst)
 	 */
 	if (dst->dev == NULL || !(dst->dev->flags&IFF_UP)) {
 		dst->input = dst_discard;
-		dst->output = dst_discard_sk;
+		dst->output = dst_discard_out;
 	}
 	dst->obsolete = DST_OBSOLETE_DEAD;
 }
@@ -352,7 +352,7 @@ static struct dst_ops md_dst_ops = {
 	.family =		AF_UNSPEC,
 };
 
-static int dst_md_discard_sk(struct sock *sk, struct sk_buff *skb)
+static int dst_md_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	WARN_ONCE(1, "Attempting to call output on metadata dst\n");
 	kfree_skb(skb);
@@ -375,7 +375,7 @@ static void __metadata_dst_init(struct metadata_dst *md_dst, u8 optslen)
 		 DST_METADATA | DST_NOCACHE | DST_NOCOUNT);
 
 	dst->input = dst_md_discard;
-	dst->output = dst_md_discard_sk;
+	dst->output = dst_md_discard_out;
 
 	memset(dst + 1, 0, sizeof(*md_dst) + optslen - sizeof(*dst));
 }
@@ -430,7 +430,7 @@ static void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
 
 	if (!unregister) {
 		dst->input = dst_discard;
-		dst->output = dst_discard_sk;
+		dst->output = dst_discard_out;
 	} else {
 		dst->dev = dev_net(dst->dev)->loopback_dev;
 		dev_hold(dst->dev);
diff --git a/net/core/lwtunnel.c b/net/core/lwtunnel.c
index dfb1a9ca0835..299cfc24d888 100644
--- a/net/core/lwtunnel.c
+++ b/net/core/lwtunnel.c
@@ -180,7 +180,7 @@ int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 }
 EXPORT_SYMBOL(lwtunnel_cmp_encap);
 
-int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
+int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb_dst(skb);
 	const struct lwtunnel_encap_ops *ops;
@@ -199,7 +199,7 @@ int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
 	rcu_read_lock();
 	ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
 	if (likely(ops && ops->output))
-		ret = ops->output(sk, skb);
+		ret = ops->output(net, sk, skb);
 	rcu_read_unlock();
 
 	if (ret == -EOPNOTSUPP)
diff --git a/net/decnet/dn_nsp_out.c b/net/decnet/dn_nsp_out.c
index 4b02dd300f50..849805e7af52 100644
--- a/net/decnet/dn_nsp_out.c
+++ b/net/decnet/dn_nsp_out.c
@@ -85,7 +85,7 @@ static void dn_nsp_send(struct sk_buff *skb)
 	if (dst) {
 try_again:
 		skb_dst_set(skb, dst);
-		dst_output(skb->sk, skb);
+		dst_output(&init_net, skb->sk, skb);
 		return;
 	}
 
@@ -582,7 +582,7 @@ static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
 	 * associations.
 	 */
 	skb_dst_set(skb, dst_clone(dst));
-	dst_output(skb->sk, skb);
+	dst_output(&init_net, skb->sk, skb);
 }
 
 
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index e930321e2c1d..27fce283117b 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -744,7 +744,7 @@ out:
 	return NET_RX_DROP;
 }
 
-static int dn_output(struct sock *sk, struct sk_buff *skb)
+static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb_dst(skb);
 	struct dn_route *rt = (struct dn_route *)dst;
@@ -832,7 +832,7 @@ drop:
  * Used to catch bugs. This should never normally get
  * called.
  */
-static int dn_rt_bug_sk(struct sock *sk, struct sk_buff *skb)
+static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct dn_skb_cb *cb = DN_SKB_CB(skb);
 
@@ -1469,7 +1469,7 @@ make_route:
 
 	rt->n = neigh;
 	rt->dst.lastuse = jiffies;
-	rt->dst.output = dn_rt_bug_sk;
+	rt->dst.output = dn_rt_bug_out;
 	switch (res.type) {
 	case RTN_UNICAST:
 		rt->dst.input = dn_forward;
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index de6d4c8ba600..64aaf3522a59 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -397,7 +397,7 @@ static int igmpv3_sendpack(struct sk_buff *skb)
 
 	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 
-	return ip_local_out(skb);
+	return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
 }
 
 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
@@ -739,7 +739,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 	ih->group = group;
 	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 
-	return ip_local_out(skb);
+	return ip_local_out(net, skb->sk, skb);
 }
 
 static void igmp_gq_timer_expire(unsigned long data)
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index d66cfb35ba74..da0d7ce85844 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -72,7 +72,7 @@ static int ip_forward_finish(struct net *net, struct sock *sk, struct sk_buff *s
 		ip_forward_options(skb);
 
 	skb_sender_cpu_clear(skb);
-	return dst_output(sk, skb);
+	return dst_output(net, sk, skb);
 }
 
 int ip_forward(struct sk_buff *skb)
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 911ea739049a..67404e1fe7d4 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -96,34 +96,28 @@ void ip_send_check(struct iphdr *iph)
 }
 EXPORT_SYMBOL(ip_send_check);
 
-static int __ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
+int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct net *net = dev_net(skb_dst(skb)->dev);
 	struct iphdr *iph = ip_hdr(skb);
 
 	iph->tot_len = htons(skb->len);
 	ip_send_check(iph);
 	return nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
 		       net, sk, skb, NULL, skb_dst(skb)->dev,
-		       dst_output_okfn);
+		       dst_output);
 }
 
-int __ip_local_out(struct sk_buff *skb)
-{
-	return __ip_local_out_sk(skb->sk, skb);
-}
-
-int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
+int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	int err;
 
-	err = __ip_local_out(skb);
+	err = __ip_local_out(net, sk, skb);
 	if (likely(err == 1))
-		err = dst_output(sk, skb);
+		err = dst_output(net, sk, skb);
 
 	return err;
 }
-EXPORT_SYMBOL_GPL(ip_local_out_sk);
+EXPORT_SYMBOL_GPL(ip_local_out);
 
 static inline int ip_select_ttl(struct inet_sock *inet, struct dst_entry *dst)
 {
@@ -143,6 +137,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 {
 	struct inet_sock *inet = inet_sk(sk);
 	struct rtable *rt = skb_rtable(skb);
+	struct net *net = sock_net(sk);
 	struct iphdr *iph;
 
 	/* Build the IP header. */
@@ -161,7 +156,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 		iph->id = 0;
 	} else {
 		iph->frag_off = 0;
-		__ip_select_ident(sock_net(sk), iph, 1);
+		__ip_select_ident(net, iph, 1);
 	}
 
 	if (opt && opt->opt.optlen) {
@@ -173,7 +168,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
 	skb->mark = sk->sk_mark;
 
 	/* Send it out. */
-	return ip_local_out(skb);
+	return ip_local_out(net, skb->sk, skb);
 }
 EXPORT_SYMBOL_GPL(ip_build_and_send_pkt);
 
@@ -276,7 +271,7 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
 	/* Policy lookup after SNAT yielded a new policy */
 	if (skb_dst(skb)->xfrm) {
 		IPCB(skb)->flags |= IPSKB_REROUTED;
-		return dst_output(sk, skb);
+		return dst_output(net, sk, skb);
 	}
 #endif
 	mtu = ip_skb_dst_mtu(skb);
@@ -289,11 +284,10 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
 	return ip_finish_output2(net, sk, skb);
 }
 
-int ip_mc_output(struct sock *sk, struct sk_buff *skb)
+int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct rtable *rt = skb_rtable(skb);
 	struct net_device *dev = rt->dst.dev;
-	struct net *net = dev_net(dev);
 
 	/*
 	 *	If the indicated interface is up and running, send the packet.
@@ -352,10 +346,9 @@ int ip_mc_output(struct sock *sk, struct sk_buff *skb)
 			    !(IPCB(skb)->flags & IPSKB_REROUTED));
 }
 
-int ip_output(struct sock *sk, struct sk_buff *skb)
+int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct net_device *dev = skb_dst(skb)->dev;
-	struct net *net = dev_net(dev);
 
 	IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
 
@@ -386,6 +379,7 @@ static void ip_copy_addrs(struct iphdr *iph, const struct flowi4 *fl4)
 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
 {
 	struct inet_sock *inet = inet_sk(sk);
+	struct net *net = sock_net(sk);
 	struct ip_options_rcu *inet_opt;
 	struct flowi4 *fl4;
 	struct rtable *rt;
@@ -416,7 +410,7 @@ int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
 		 * keep trying until route appears or the connection times
 		 * itself out.
 		 */
-		rt = ip_route_output_ports(sock_net(sk), fl4, sk,
+		rt = ip_route_output_ports(net, fl4, sk,
 					   daddr, inet->inet_saddr,
 					   inet->inet_dport,
 					   inet->inet_sport,
@@ -453,20 +447,20 @@ packet_routed:
 		ip_options_build(skb, &inet_opt->opt, inet->inet_daddr, rt, 0);
 	}
 
-	ip_select_ident_segs(sock_net(sk), skb, sk,
+	ip_select_ident_segs(net, skb, sk,
 			     skb_shinfo(skb)->gso_segs ?: 1);
 
 	/* TODO : should we use skb->sk here instead of sk ? */
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;
 
-	res = ip_local_out(skb);
+	res = ip_local_out(net, sk, skb);
 	rcu_read_unlock();
 	return res;
 
 no_route:
 	rcu_read_unlock();
-	IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
+	IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
 	kfree_skb(skb);
 	return -EHOSTUNREACH;
 }
@@ -1440,7 +1434,7 @@ int ip_send_skb(struct net *net, struct sk_buff *skb)
 {
 	int err;
 
-	err = ip_local_out(skb);
+	err = ip_local_out(net, skb->sk, skb);
 	if (err) {
 		if (err > 0)
 			err = net_xmit_errno(err);
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 84dce6a92f93..6cb9009c3d96 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -53,6 +53,7 @@ int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 		  __u8 tos, __u8 ttl, __be16 df, bool xnet)
 {
 	int pkt_len = skb->len - skb_inner_network_offset(skb);
+	struct net *net = dev_net(rt->dst.dev);
 	struct iphdr *iph;
 	int err;
 
@@ -76,10 +77,9 @@ int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
 	iph->daddr	=	dst;
 	iph->saddr	=	src;
 	iph->ttl	=	ttl;
-	__ip_select_ident(dev_net(rt->dst.dev), iph,
-			  skb_shinfo(skb)->gso_segs ?: 1);
+	__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
 
-	err = ip_local_out_sk(sk, skb);
+	err = ip_local_out(net, sk, skb);
 	if (unlikely(net_xmit_eval(err)))
 		pkt_len = 0;
 	return pkt_len;
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 3b87ec5178f9..4d8f0b698777 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -197,7 +197,7 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
 	skb_dst_set(skb, dst);
 	skb->dev = skb_dst(skb)->dev;
 
-	err = dst_output(skb->sk, skb);
+	err = dst_output(tunnel->net, skb->sk, skb);
 	if (net_xmit_eval(err) == 0)
 		err = skb->len;
 	iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index cfcb996ec51b..fc42525d8694 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1689,7 +1689,7 @@ static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
 	if (unlikely(opt->optlen))
 		ip_forward_options(skb);
 
-	return dst_output(sk, skb);
+	return dst_output(net, sk, skb);
 }
 
 /*
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 6a6e762ab27f..f1a8df8ecc1f 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -63,7 +63,7 @@ synproxy_send_tcp(const struct synproxy_net *snet,
 		nf_conntrack_get(nfct);
 	}
 
-	ip_local_out(nskb);
+	ip_local_out(net, nskb->sk, nskb);
 	return;
 
 free_nskb:
diff --git a/net/ipv4/netfilter/nf_dup_ipv4.c b/net/ipv4/netfilter/nf_dup_ipv4.c
index ce2a59e5c665..ceb187308120 100644
--- a/net/ipv4/netfilter/nf_dup_ipv4.c
+++ b/net/ipv4/netfilter/nf_dup_ipv4.c
@@ -92,7 +92,7 @@ void nf_dup_ipv4(struct net *net, struct sk_buff *skb, unsigned int hooknum,
 
 	if (nf_dup_ipv4_route(net, skb, gw, oif)) {
 		__this_cpu_write(nf_skb_duplicated, true);
-		ip_local_out(skb);
+		ip_local_out(net, skb->sk, skb);
 		__this_cpu_write(nf_skb_duplicated, false);
 	} else {
 		kfree_skb(skb);
diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c
index 2f5e925d3264..c747b2d9eb77 100644
--- a/net/ipv4/netfilter/nf_reject_ipv4.c
+++ b/net/ipv4/netfilter/nf_reject_ipv4.c
@@ -157,7 +157,7 @@ void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
 		dev_queue_xmit(nskb);
 	} else
 #endif
-		ip_local_out(nskb);
+		ip_local_out(net, nskb->sk, nskb);
 
 	return;
 
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 09a07e8b2f35..8c0d0bdc2a7c 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -413,7 +413,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 
 	err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
 		      net, sk, skb, NULL, rt->dst.dev,
-		      dst_output_okfn);
+		      dst_output);
 	if (err > 0)
 		err = net_xmit_errno(err);
 	if (err)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index bf1486bd7e81..4be5ff08f98d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1152,7 +1152,7 @@ static void ipv4_link_failure(struct sk_buff *skb)
 		dst_set_expires(&rt->dst, 0);
 }
 
-static int ip_rt_bug(struct sock *sk, struct sk_buff *skb)
+static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	pr_debug("%s: %pI4 -> %pI4, %s\n",
 		 __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
@@ -2303,7 +2303,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
 
 		new->__use = 1;
 		new->input = dst_discard;
-		new->output = dst_discard_sk;
+		new->output = dst_discard_out;
 
 		new->dev = ort->dst.dev;
 		if (new->dev)
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index cd6be736e19f..9f298d0dc9a1 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -87,17 +87,15 @@ static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 #ifdef CONFIG_NETFILTER
 	if (!x) {
 		IPCB(skb)->flags |= IPSKB_REROUTED;
-		return dst_output(sk, skb);
+		return dst_output(net, sk, skb);
 	}
 #endif
 
 	return x->outer_mode->afinfo->output_finish(sk, skb);
 }
 
-int xfrm4_output(struct sock *sk, struct sk_buff *skb)
+int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct net *net = dev_net(skb_dst(skb)->dev);
-
 	return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
 			    net, sk, skb, NULL, skb_dst(skb)->dev,
 			    __xfrm4_output,
diff --git a/net/ipv6/ila.c b/net/ipv6/ila.c
index 678d2df4b8d9..1a6852e1ac69 100644
--- a/net/ipv6/ila.c
+++ b/net/ipv6/ila.c
@@ -91,7 +91,7 @@ static void update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
 	*(__be64 *)&ip6h->daddr = p->locator;
 }
 
-static int ila_output(struct sock *sk, struct sk_buff *skb)
+static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct dst_entry *dst = skb_dst(skb);
 
@@ -100,7 +100,7 @@ static int ila_output(struct sock *sk, struct sk_buff *skb)
 
 	update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
 
-	return dst->lwtstate->orig_output(sk, skb);
+	return dst->lwtstate->orig_output(net, sk, skb);
 
 drop:
 	kfree_skb(skb);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index caf7d14a1bdd..32583b507c2e 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -130,11 +130,10 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
 		return ip6_finish_output2(net, sk, skb);
 }
 
-int ip6_output(struct sock *sk, struct sk_buff *skb)
+int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct net_device *dev = skb_dst(skb)->dev;
 	struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
-	struct net *net = dev_net(dev);
 
 	if (unlikely(idev->cnf.disable_ipv6)) {
 		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
@@ -233,7 +232,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
 		 */
 		return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 			       net, (struct sock *)sk, skb, NULL, dst->dev,
-			       dst_output_okfn);
+			       dst_output);
 	}
 
 	skb->dev = dst->dev;
@@ -333,7 +332,7 @@ static inline int ip6_forward_finish(struct net *net, struct sock *sk,
 				     struct sk_buff *skb)
 {
 	skb_sender_cpu_clear(skb);
-	return dst_output(sk, skb);
+	return dst_output(net, sk, skb);
 }
 
 static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
@@ -1692,7 +1691,7 @@ int ip6_send_skb(struct sk_buff *skb)
 	struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
 	int err;
 
-	err = ip6_local_out(skb);
+	err = ip6_local_out(net, skb->sk, skb);
 	if (err) {
 		if (err > 0)
 			err = net_xmit_errno(err);
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index f96f1c19b4a8..0a8610b33d79 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -482,7 +482,7 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
 		return -EMSGSIZE;
 	}
 
-	err = dst_output(skb->sk, skb);
+	err = dst_output(t->net, skb->sk, skb);
 	if (net_xmit_eval(err) == 0) {
 		struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
 
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 5e5d16e7ce85..ad19136086dd 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1991,7 +1991,7 @@ static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct
 			 IPSTATS_MIB_OUTFORWDATAGRAMS);
 	IP6_ADD_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
 			 IPSTATS_MIB_OUTOCTETS, skb->len);
-	return dst_output(sk, skb);
+	return dst_output(net, sk, skb);
 }
 
 /*
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index a8bf57ca74d3..124338a39e29 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1646,7 +1646,7 @@ static void mld_sendpack(struct sk_buff *skb)
 
 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 		      net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
-		      dst_output_okfn);
+		      dst_output);
 out:
 	if (!err) {
 		ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
@@ -2010,7 +2010,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
 	skb_dst_set(skb, dst);
 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 		      net, sk, skb, NULL, skb->dev,
-		      dst_output_okfn);
+		      dst_output);
 out:
 	if (!err) {
 		ICMP6MSGOUT_INC_STATS(net, idev, type);
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 7089c305245c..b18012f9f9fc 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -465,7 +465,7 @@ static void ndisc_send_skb(struct sk_buff *skb,
 
 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 		      net, sk, skb, NULL, dst->dev,
-		      dst_output_okfn);
+		      dst_output);
 	if (!err) {
 		ICMP6MSGOUT_INC_STATS(net, idev, type);
 		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
diff --git a/net/ipv6/netfilter/ip6t_SYNPROXY.c b/net/ipv6/netfilter/ip6t_SYNPROXY.c
index c2356602158a..a10a2a9e9f94 100644
--- a/net/ipv6/netfilter/ip6t_SYNPROXY.c
+++ b/net/ipv6/netfilter/ip6t_SYNPROXY.c
@@ -76,7 +76,7 @@ synproxy_send_tcp(const struct synproxy_net *snet,
 		nf_conntrack_get(nfct);
 	}
 
-	ip6_local_out(nskb);
+	ip6_local_out(net, nskb->sk, nskb);
 	return;
 
 free_nskb:
diff --git a/net/ipv6/netfilter/nf_dup_ipv6.c b/net/ipv6/netfilter/nf_dup_ipv6.c
index ee0d9a5b16c3..6989c70ae29f 100644
--- a/net/ipv6/netfilter/nf_dup_ipv6.c
+++ b/net/ipv6/netfilter/nf_dup_ipv6.c
@@ -68,7 +68,7 @@ void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
 	}
 	if (nf_dup_ipv6_route(net, skb, gw, oif)) {
 		__this_cpu_write(nf_skb_duplicated, true);
-		ip6_local_out(skb);
+		ip6_local_out(net, skb->sk, skb);
 		__this_cpu_write(nf_skb_duplicated, false);
 	} else {
 		kfree_skb(skb);
diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
index 94b4c6dfb400..7309e475f68b 100644
--- a/net/ipv6/netfilter/nf_reject_ipv6.c
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -206,7 +206,7 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
 		dev_queue_xmit(nskb);
 	} else
 #endif
-		ip6_local_out(nskb);
+		ip6_local_out(net, nskb->sk, nskb);
 }
 EXPORT_SYMBOL_GPL(nf_send_reset6);
 
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index e77102c4f804..462f2a76b5c2 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -138,9 +138,8 @@ int ip6_dst_hoplimit(struct dst_entry *dst)
 EXPORT_SYMBOL(ip6_dst_hoplimit);
 #endif
 
-static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
+int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct net *net = dev_net(skb_dst(skb)->dev);
 	int len;
 
 	len = skb->len - sizeof(struct ipv6hdr);
@@ -151,29 +150,18 @@ static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
 
 	return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
 		       net, sk, skb, NULL, skb_dst(skb)->dev,
-		       dst_output_okfn);
-}
-
-int __ip6_local_out(struct sk_buff *skb)
-{
-	return __ip6_local_out_sk(skb->sk, skb);
+		       dst_output);
 }
 EXPORT_SYMBOL_GPL(__ip6_local_out);
 
-int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
+int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	int err;
 
-	err = __ip6_local_out_sk(sk, skb);
+	err = __ip6_local_out(net, sk, skb);
 	if (likely(err == 1))
-		err = dst_output(sk, skb);
+		err = dst_output(net, sk, skb);
 
 	return err;
 }
-EXPORT_SYMBOL_GPL(ip6_local_out_sk);
-
-int ip6_local_out(struct sk_buff *skb)
-{
-	return ip6_local_out_sk(skb->sk, skb);
-}
 EXPORT_SYMBOL_GPL(ip6_local_out);
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index fec0151522a2..dc65ec198f7c 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -655,7 +655,7 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
 
 	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
-		      NULL, rt->dst.dev, dst_output_okfn);
+		      NULL, rt->dst.dev, dst_output);
 	if (err > 0)
 		err = net_xmit_errno(err);
 	if (err)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d3d946773a3e..4320ddcac33f 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -86,9 +86,9 @@ static void		ip6_dst_ifdown(struct dst_entry *,
 static int		 ip6_dst_gc(struct dst_ops *ops);
 
 static int		ip6_pkt_discard(struct sk_buff *skb);
-static int		ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
+static int		ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
 static int		ip6_pkt_prohibit(struct sk_buff *skb);
-static int		ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
+static int		ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
 static void		ip6_link_failure(struct sk_buff *skb);
 static void		ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
 					   struct sk_buff *skb, u32 mtu);
@@ -308,7 +308,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
 		.obsolete	= DST_OBSOLETE_FORCE_CHK,
 		.error		= -EINVAL,
 		.input		= dst_discard,
-		.output		= dst_discard_sk,
+		.output		= dst_discard_out,
 	},
 	.rt6i_flags	= (RTF_REJECT | RTF_NONEXTHOP),
 	.rt6i_protocol  = RTPROT_KERNEL,
@@ -1195,7 +1195,7 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
 
 		new->__use = 1;
 		new->input = dst_discard;
-		new->output = dst_discard_sk;
+		new->output = dst_discard_out;
 
 		if (dst_metrics_read_only(&ort->dst))
 			new->_metrics = ort->dst._metrics;
@@ -1853,7 +1853,7 @@ int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
 		switch (cfg->fc_type) {
 		case RTN_BLACKHOLE:
 			rt->dst.error = -EINVAL;
-			rt->dst.output = dst_discard_sk;
+			rt->dst.output = dst_discard_out;
 			rt->dst.input = dst_discard;
 			break;
 		case RTN_PROHIBIT:
@@ -2446,7 +2446,7 @@ static int ip6_pkt_discard(struct sk_buff *skb)
 	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
 }
 
-static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
+static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	skb->dev = skb_dst(skb)->dev;
 	return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
@@ -2457,7 +2457,7 @@ static int ip6_pkt_prohibit(struct sk_buff *skb)
 	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
 }
 
-static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
+static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	skb->dev = skb_dst(skb)->dev;
 	return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 4cefda009f53..9db067a11b52 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -147,7 +147,7 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 #ifdef CONFIG_NETFILTER
 	if (!x) {
 		IP6CB(skb)->flags |= IP6SKB_REROUTED;
-		return dst_output(sk, skb);
+		return dst_output(net, sk, skb);
 	}
 #endif
 
@@ -173,10 +173,8 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 	return x->outer_mode->afinfo->output_finish(sk, skb);
 }
 
-int xfrm6_output(struct sock *sk, struct sk_buff *skb)
+int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
-	struct net *net = dev_net(skb_dst(skb)->dev);
-
 	return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
 			    net, sk, skb,  NULL, skb_dst(skb)->dev,
 			    __xfrm6_output,
diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c
index 21e70bc9af98..67591aef9cae 100644
--- a/net/mpls/mpls_iptunnel.c
+++ b/net/mpls/mpls_iptunnel.c
@@ -37,7 +37,7 @@ static unsigned int mpls_encap_size(struct mpls_iptunnel_encap *en)
 	return en->labels * sizeof(struct mpls_shim_hdr);
 }
 
-int mpls_output(struct sock *sk, struct sk_buff *skb)
+int mpls_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	struct mpls_iptunnel_encap *tun_encap_info;
 	struct mpls_shim_hdr *hdr;
diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 77182b9750cd..3264cb49b333 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -576,7 +576,7 @@ static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb,
 		if (!skb->sk)
 			skb_sender_cpu_clear(skb);
 		NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
-			NULL, skb_dst(skb)->dev, dst_output_okfn);
+			NULL, skb_dst(skb)->dev, dst_output);
 	} else
 		ret = NF_ACCEPT;
 
@@ -598,7 +598,7 @@ static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
 		if (!skb->sk)
 			skb_sender_cpu_clear(skb);
 		NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
-			NULL, skb_dst(skb)->dev, dst_output_okfn);
+			NULL, skb_dst(skb)->dev, dst_output);
 	} else
 		ret = NF_ACCEPT;
 	return ret;
@@ -1049,7 +1049,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ret = ip_vs_tunnel_xmit_prepare(skb, cp);
 	if (ret == NF_ACCEPT)
-		ip_local_out(skb);
+		ip_local_out(net, skb->sk, skb);
 	else if (ret == NF_DROP)
 		kfree_skb(skb);
 	rcu_read_unlock();
@@ -1141,7 +1141,7 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	ret = ip_vs_tunnel_xmit_prepare(skb, cp);
 	if (ret == NF_ACCEPT)
-		ip6_local_out(skb);
+		ip6_local_out(cp->ipvs->net, skb->sk, skb);
 	else if (ret == NF_DROP)
 		kfree_skb(skb);
 	rcu_read_unlock();
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index c48a4b8582bb..cc3676eb6239 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -136,12 +136,12 @@ int xfrm_output_resume(struct sk_buff *skb, int err)
 	while (likely((err = xfrm_output_one(skb, err)) == 0)) {
 		nf_reset(skb);
 
-		err = skb_dst(skb)->ops->local_out(skb);
+		err = skb_dst(skb)->ops->local_out(net, skb->sk, skb);
 		if (unlikely(err != 1))
 			goto out;
 
 		if (!skb_dst(skb)->xfrm)
-			return dst_output(skb->sk, skb);
+			return dst_output(net, skb->sk, skb);
 
 		err = nf_hook(skb_dst(skb)->ops->family,
 			      NF_INET_POST_ROUTING, net, skb->sk, skb,
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 418daa038edf..09bfcbac63bb 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1887,6 +1887,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
 	struct sock *sk;
 	struct dst_entry *dst;
 	struct xfrm_policy *pol = (struct xfrm_policy *)arg;
+	struct net *net = xp_net(pol);
 	struct xfrm_policy_queue *pq = &pol->polq;
 	struct flowi fl;
 	struct sk_buff_head list;
@@ -1903,8 +1904,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
 	spin_unlock(&pq->hold_queue.lock);
 
 	dst_hold(dst->path);
-	dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
-			  sk, 0);
+	dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
 	if (IS_ERR(dst))
 		goto purge_queue;
 
@@ -1934,8 +1934,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
 
 		xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
 		dst_hold(skb_dst(skb)->path);
-		dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
-				  &fl, skb->sk, 0);
+		dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
 		if (IS_ERR(dst)) {
 			kfree_skb(skb);
 			continue;
@@ -1945,7 +1944,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
 		skb_dst_drop(skb);
 		skb_dst_set(skb, dst);
 
-		dst_output(skb->sk, skb);
+		dst_output(net, skb->sk, skb);
 	}
 
 out:
@@ -1958,7 +1957,7 @@ purge_queue:
 	xfrm_pol_put(pol);
 }
 
-static int xdst_queue_output(struct sock *sk, struct sk_buff *skb)
+static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
 	unsigned long sched_next;
 	struct dst_entry *dst = skb_dst(skb);