[TCP]: Remove dead code in init_sequence

This removes two redundancies:

1) The test (skb->protocol == htons(ETH_P_IPV6) in tcp_v6_init_sequence()
   is always true, due to
	* tcp_v6_conn_request() is the only function calling this one
	* tcp_v6_conn_request() redirects all skb's with ETH_P_IP protocol to
	  tcp_v4_conn_request() [ cf. top of tcp_v6_conn_request()]

2) The first argument, `struct sock *sk' of tcp_v{4,6}_init_sequence() is
   never used.

Signed-off-by: Gerrit Renker  <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 8 insertions, 15 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 5fbf96552cac..2eb58844403c 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -111,7 +111,7 @@ void tcp_unhash(struct sock *sk)
         inet_unhash(&tcp_hashinfo, sk);
 }
 
-static inline __u32 tcp_v4_init_sequence(struct sock *sk, struct sk_buff *skb)
+static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb)
 {
         return secure_tcp_sequence_number(skb->nh.iph->daddr,
                                           skb->nh.iph->saddr,
@@ -859,7 +859,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
                         goto drop_and_free;
                 }
 
-                isn = tcp_v4_init_sequence(sk, skb);
+                isn = tcp_v4_init_sequence(skb);
         }
         tcp_rsk(req)->snt_isn = isn;
 
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 06b536b47f97..9a8e690fdf7c 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -106,19 +106,12 @@ static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len,
         return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
 }
 
-static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
+static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
 {
-        if (skb->protocol == htons(ETH_P_IPV6)) {
-                return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
-                                                    skb->nh.ipv6h->saddr.s6_addr32,
-                                                    skb->h.th->dest,
-                                                    skb->h.th->source);
-        } else {
-                return secure_tcp_sequence_number(skb->nh.iph->daddr,
-                                                  skb->nh.iph->saddr,
-                                                  skb->h.th->dest,
-                                                  skb->h.th->source);
-        }
+        return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
+                                            skb->nh.ipv6h->saddr.s6_addr32,
+                                            skb->h.th->dest,
+                                            skb->h.th->source);
 }
 
 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, 
@@ -822,7 +815,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
                 treq->iif = inet6_iif(skb);
 
         if (isn == 0) 
-                isn = tcp_v6_init_sequence(sk,skb);
+                isn = tcp_v6_init_sequence(skb);
 
         tcp_rsk(req)->snt_isn = isn;