inet: prepare struct net for TCP MIB accounting

This is the same as the first patch in the set, but preparing
the net for TCP_XXX_STATS - save the struct net on the stack
where required and possible.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7797d528701b..db3bf9be076f 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -544,6 +544,7 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
 #ifdef CONFIG_TCP_MD5SIG
         struct tcp_md5sig_key *key;
 #endif
+        struct net *net;
 
         /* Never send a reset in response to a reset. */
         if (th->rst)
@@ -594,7 +595,8 @@ static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
                                       sizeof(struct tcphdr), IPPROTO_TCP, 0);
         arg.csumoffset = offsetof(struct tcphdr, check) / 2;
 
-        ip_send_reply(dev_net(skb->dst->dev)->ipv4.tcp_sock, skb,
+        net = dev_net(skb->dst->dev);
+        ip_send_reply(net->ipv4.tcp_sock, skb,
                       &arg, arg.iov[0].iov_len);
 
         TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
@@ -619,6 +621,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
                         ];
         } rep;
         struct ip_reply_arg arg;
+        struct net *net = dev_net(skb->dev);
 
         memset(&rep.th, 0, sizeof(struct tcphdr));
         memset(&arg, 0, sizeof(arg));
@@ -668,7 +671,7 @@ static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
         if (oif)
                 arg.bound_dev_if = oif;
 
-        ip_send_reply(dev_net(skb->dev)->ipv4.tcp_sock, skb,
+        ip_send_reply(net->ipv4.tcp_sock, skb,
                       &arg, arg.iov[0].iov_len);
 
         TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
@@ -1505,6 +1508,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
         struct tcphdr *th;
         struct sock *sk;
         int ret;
+        struct net *net = dev_net(skb->dev);
 
         if (skb->pkt_type != PACKET_HOST)
                 goto discard_it;
@@ -1539,7 +1543,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
         TCP_SKB_CB(skb)->flags   = iph->tos;
         TCP_SKB_CB(skb)->sacked  = 0;
 
-        sk = __inet_lookup(dev_net(skb->dev), &tcp_hashinfo, iph->saddr,
+        sk = __inet_lookup(net, &tcp_hashinfo, iph->saddr,
                         th->source, iph->daddr, th->dest, inet_iif(skb));
         if (!sk)
                 goto no_tcp_socket;