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>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 7797d52..db3bf9b 100644 (file)
--- 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;

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 30dbab7..fc5f716 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1617,6 +1617,7 @@ static int tcp_v6_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;
@@ -1648,7 +1649,7 @@ static int tcp_v6_rcv(struct sk_buff *skb)
        TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
        TCP_SKB_CB(skb)->sacked = 0;
 
-       sk = __inet6_lookup(dev_net(skb->dev), &tcp_hashinfo,
+       sk = __inet6_lookup(net, &tcp_hashinfo,
                        &ipv6_hdr(skb)->saddr, th->source,
                        &ipv6_hdr(skb)->daddr, ntohs(th->dest),
                        inet6_iif(skb));