ipv4: tcp: clean up tcp_v4_early_demux()

Use same header helpers than tcp_v6_early_demux() because they
are a bit faster, and as they make IPv4/IPv6 versions look
the same.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ef998b008a570ba0976b911d85d0b98bb6d834fb..694ea4c557f8667208da19125526fed90af0a69a 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1918,7 +1918,6 @@ EXPORT_SYMBOL(tcp_v4_do_rcv);
 
 void tcp_v4_early_demux(struct sk_buff *skb)
 {
-       struct net *net = dev_net(skb->dev);
        const struct iphdr *iph;
        const struct tcphdr *th;
        struct sock *sk;
@@ -1926,16 +1925,16 @@ void tcp_v4_early_demux(struct sk_buff *skb)
        if (skb->pkt_type != PACKET_HOST)
                return;
 
-       if (!pskb_may_pull(skb, ip_hdrlen(skb) + sizeof(struct tcphdr)))
+       if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
                return;
 
        iph = ip_hdr(skb);
-       th = (struct tcphdr *) ((char *)iph + ip_hdrlen(skb));
+       th = tcp_hdr(skb);
 
        if (th->doff < sizeof(struct tcphdr) / 4)
                return;
 
-       sk = __inet_lookup_established(net, &tcp_hashinfo,
+       sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
                                       iph->saddr, th->source,
                                       iph->daddr, ntohs(th->dest),
                                       skb->skb_iif);