Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter/IPVS updates for net-next

The following pull request contains Netfilter/IPVS updates for net-next
containing 90 patches from Eric Biederman.

The main goal of this batch is to avoid recurrent lookups for the netns
pointer, that happens over and over again in our Netfilter/IPVS code. The idea
consists of passing netns pointer from the hook state to the relevant functions
and objects where this may be needed.

You can find more information on the IPVS updates from Simon Horman's commit
merge message:

c3456026adc0 ("Merge tag 'ipvs2-for-v4.4' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs-next").

Exceptionally, this time, I'm not posting the patches again on netdev, Eric
already Cc'ed this mailing list in the original submission. If you need me to
make, just let me know.
====================

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

8 files changed, 22 insertions, 19 deletions

diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index 61eafc9b4545..c3776ff6749f 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -17,9 +17,8 @@
 #include <net/netfilter/nf_queue.h>
 
 /* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
-int ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
+int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned int addr_type)
 {
-	struct net *net = dev_net(skb_dst(skb)->dev);
 	const struct iphdr *iph = ip_hdr(skb);
 	struct rtable *rt;
 	struct flowi4 fl4 = {};
@@ -104,7 +103,7 @@ static void nf_ip_saveroute(const struct sk_buff *skb,
 	}
 }
 
-static int nf_ip_reroute(struct sk_buff *skb,
+static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
 			 const struct nf_queue_entry *entry)
 {
 	const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
@@ -116,7 +115,7 @@ static int nf_ip_reroute(struct sk_buff *skb,
 		      skb->mark == rt_info->mark &&
 		      iph->daddr == rt_info->daddr &&
 		      iph->saddr == rt_info->saddr))
-			return ip_route_me_harder(skb, RTN_UNSPEC);
+			return ip_route_me_harder(net, skb, RTN_UNSPEC);
 	}
 	return 0;
 }
diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
index 87907d4bd259..1d16c0f28df0 100644
--- a/net/ipv4/netfilter/ipt_REJECT.c
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -59,7 +59,7 @@ reject_tg(struct sk_buff *skb, const struct xt_action_param *par)
 		nf_send_unreach(skb, ICMP_PKT_FILTERED, hook);
 		break;
 	case IPT_TCP_RESET:
-		nf_send_reset(skb, hook);
+		nf_send_reset(par->net, skb, hook);
 	case IPT_ICMP_ECHOREPLY:
 		/* Doesn't happen. */
 		break;
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index d7021f28c3f0..6a6e762ab27f 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -39,11 +39,14 @@ synproxy_build_ip(struct sk_buff *skb, __be32 saddr, __be32 daddr)
 }
 
 static void
-synproxy_send_tcp(const struct sk_buff *skb, struct sk_buff *nskb,
+synproxy_send_tcp(const struct synproxy_net *snet,
+		  const struct sk_buff *skb, struct sk_buff *nskb,
 		  struct nf_conntrack *nfct, enum ip_conntrack_info ctinfo,
 		  struct iphdr *niph, struct tcphdr *nth,
 		  unsigned int tcp_hdr_size)
 {
+	struct net *net = nf_ct_net(snet->tmpl);
+
 	nth->check = ~tcp_v4_check(tcp_hdr_size, niph->saddr, niph->daddr, 0);
 	nskb->ip_summed   = CHECKSUM_PARTIAL;
 	nskb->csum_start  = (unsigned char *)nth - nskb->head;
@@ -51,7 +54,7 @@ synproxy_send_tcp(const struct sk_buff *skb, struct sk_buff *nskb,
 
 	skb_dst_set_noref(nskb, skb_dst(skb));
 	nskb->protocol = htons(ETH_P_IP);
-	if (ip_route_me_harder(nskb, RTN_UNSPEC))
+	if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
 		goto free_nskb;
 
 	if (nfct) {
@@ -68,7 +71,8 @@ free_nskb:
 }
 
 static void
-synproxy_send_client_synack(const struct sk_buff *skb, const struct tcphdr *th,
+synproxy_send_client_synack(const struct synproxy_net *snet,
+			    const struct sk_buff *skb, const struct tcphdr *th,
 			    const struct synproxy_options *opts)
 {
 	struct sk_buff *nskb;
@@ -104,7 +108,7 @@ synproxy_send_client_synack(const struct sk_buff *skb, const struct tcphdr *th,
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
+	synproxy_send_tcp(snet, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
 			  niph, nth, tcp_hdr_size);
 }
 
@@ -148,7 +152,7 @@ synproxy_send_server_syn(const struct synproxy_net *snet,
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW,
+	synproxy_send_tcp(snet, skb, nskb, &snet->tmpl->ct_general, IP_CT_NEW,
 			  niph, nth, tcp_hdr_size);
 }
 
@@ -188,7 +192,7 @@ synproxy_send_server_ack(const struct synproxy_net *snet,
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(skb, nskb, NULL, 0, niph, nth, tcp_hdr_size);
+	synproxy_send_tcp(snet, skb, nskb, NULL, 0, niph, nth, tcp_hdr_size);
 }
 
 static void
@@ -226,7 +230,7 @@ synproxy_send_client_ack(const struct synproxy_net *snet,
 
 	synproxy_build_options(nth, opts);
 
-	synproxy_send_tcp(skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
+	synproxy_send_tcp(snet, skb, nskb, skb->nfct, IP_CT_ESTABLISHED_REPLY,
 	                  niph, nth, tcp_hdr_size);
 }
 
@@ -287,7 +291,7 @@ synproxy_tg4(struct sk_buff *skb, const struct xt_action_param *par)
 					  XT_SYNPROXY_OPT_SACK_PERM |
 					  XT_SYNPROXY_OPT_ECN);
 
-		synproxy_send_client_synack(skb, th, &opts);
+		synproxy_send_client_synack(snet, skb, th, &opts);
 		return NF_DROP;
 
 	} else if (th->ack && !(th->fin || th->rst || th->syn)) {
diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index 2d6fc911866f..ba5d392a13c4 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -67,7 +67,7 @@ ipt_mangle_out(struct sk_buff *skb, const struct nf_hook_state *state)
 		    iph->daddr != daddr ||
 		    skb->mark != mark ||
 		    iph->tos != tos) {
-			err = ip_route_me_harder(skb, RTN_UNSPEC);
+			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
 			if (err < 0)
 				ret = NF_DROP_ERR(err);
 		}
diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
index bc3b9dcbf080..5075b7ecd26d 100644
--- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
@@ -431,7 +431,7 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb,
 
 		if (ct->tuplehash[dir].tuple.dst.u3.ip !=
 		    ct->tuplehash[!dir].tuple.src.u3.ip) {
-			err = ip_route_me_harder(skb, RTN_UNSPEC);
+			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
 			if (err < 0)
 				ret = NF_DROP_ERR(err);
 		}
diff --git a/net/ipv4/netfilter/nf_reject_ipv4.c b/net/ipv4/netfilter/nf_reject_ipv4.c
index 3262e41ff76f..2f5e925d3264 100644
--- a/net/ipv4/netfilter/nf_reject_ipv4.c
+++ b/net/ipv4/netfilter/nf_reject_ipv4.c
@@ -99,7 +99,7 @@ void nf_reject_ip_tcphdr_put(struct sk_buff *nskb, const struct sk_buff *oldskb,
 EXPORT_SYMBOL_GPL(nf_reject_ip_tcphdr_put);
 
 /* Send RST reply */
-void nf_send_reset(struct sk_buff *oldskb, int hook)
+void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
 {
 	struct sk_buff *nskb;
 	const struct iphdr *oiph;
@@ -129,7 +129,7 @@ void nf_send_reset(struct sk_buff *oldskb, int hook)
 				   ip4_dst_hoplimit(skb_dst(nskb)));
 	nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
 
-	if (ip_route_me_harder(nskb, RTN_UNSPEC))
+	if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
 		goto free_nskb;
 
 	/* "Never happens" */
diff --git a/net/ipv4/netfilter/nft_chain_route_ipv4.c b/net/ipv4/netfilter/nft_chain_route_ipv4.c
index 9f486b302108..2375b0a8be46 100644
--- a/net/ipv4/netfilter/nft_chain_route_ipv4.c
+++ b/net/ipv4/netfilter/nft_chain_route_ipv4.c
@@ -53,7 +53,7 @@ static unsigned int nf_route_table_hook(void *priv,
 		    iph->daddr != daddr ||
 		    skb->mark != mark ||
 		    iph->tos != tos)
-			if (ip_route_me_harder(skb, RTN_UNSPEC))
+			if (ip_route_me_harder(state->net, skb, RTN_UNSPEC))
 				ret = NF_DROP;
 	}
 	return ret;
diff --git a/net/ipv4/netfilter/nft_reject_ipv4.c b/net/ipv4/netfilter/nft_reject_ipv4.c
index c1582e03b628..c24f41c816b3 100644
--- a/net/ipv4/netfilter/nft_reject_ipv4.c
+++ b/net/ipv4/netfilter/nft_reject_ipv4.c
@@ -30,7 +30,7 @@ static void nft_reject_ipv4_eval(const struct nft_expr *expr,
 		nf_send_unreach(pkt->skb, priv->icmp_code, pkt->hook);
 		break;
 	case NFT_REJECT_TCP_RST:
-		nf_send_reset(pkt->skb, pkt->hook);
+		nf_send_reset(pkt->net, pkt->skb, pkt->hook);
 		break;
 	default:
 		break;