[TCP]: remove tcp header from tcp_v4_check (take #2)

The tcphdr struct passed to tcp_v4_check is not used, the following
patch removes it from the parameter list.

This adds the netfilter modifications missing in the patch I sent
for rc3-mm1.
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/tcp.h

@@ -802,9 +802,8 @@ static inline void tcp_update_wl(struct tcp_sock *tp, u32 ack, u32 seq)
 /*
  * Calculate(/check) TCP checksum
  */
-static inline __sum16 tcp_v4_check(struct tcphdr *th, int len,
-			       __be32 saddr, __be32 daddr,
-			       __wsum base)
+static inline __sum16 tcp_v4_check(int len, __be32 saddr,
+				   __be32 daddr, __wsum base)
 {
 	return csum_tcpudp_magic(saddr,daddr,len,IPPROTO_TCP,base);
 }

net/ipv4/netfilter/ip_nat_helper.c

@@ -183,7 +183,7 @@ ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
 	datalen = (*pskb)->len - iph->ihl*4;
 	if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
 		tcph->check = 0;
-		tcph->check = tcp_v4_check(tcph, datalen,
+		tcph->check = tcp_v4_check(datalen,
 					   iph->saddr, iph->daddr,
 					   csum_partial((char *)tcph,
 					   		datalen, 0));

net/ipv4/netfilter/ipt_REJECT.c

@@ -116,7 +116,7 @@ static void send_reset(struct sk_buff *oldskb, int hook)
 
 	/* Adjust TCP checksum */
 	tcph->check = 0;
-	tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
+	tcph->check = tcp_v4_check(sizeof(struct tcphdr),
 				   nskb->nh.iph->saddr,
 				   nskb->nh.iph->daddr,
 				   csum_partial((char *)tcph,

net/ipv4/netfilter/nf_nat_helper.c

@@ -176,7 +176,7 @@ nf_nat_mangle_tcp_packet(struct sk_buff **pskb,
 	datalen = (*pskb)->len - iph->ihl*4;
 	if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
 		tcph->check = 0;
-		tcph->check = tcp_v4_check(tcph, datalen,
+		tcph->check = tcp_v4_check(datalen,
 					   iph->saddr, iph->daddr,
 					   csum_partial((char *)tcph,
 					   		datalen, 0));

net/ipv4/tcp_ipv4.c

@@ -502,11 +502,11 @@ void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
 	struct tcphdr *th = skb->h.th;
 
 	if (skb->ip_summed == CHECKSUM_PARTIAL) {
-		th->check = ~tcp_v4_check(th, len,
-					  inet->saddr, inet->daddr, 0);
+		th->check = ~tcp_v4_check(len, inet->saddr,
+					  inet->daddr, 0);
 		skb->csum_offset = offsetof(struct tcphdr, check);
 	} else {
-		th->check = tcp_v4_check(th, len, inet->saddr, inet->daddr,
+		th->check = tcp_v4_check(len, inet->saddr, inet->daddr,
 					 csum_partial((char *)th,
 						      th->doff << 2,
 						      skb->csum));
@@ -525,7 +525,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
 	th = skb->h.th;
 
 	th->check = 0;
-	th->check = ~tcp_v4_check(th, skb->len, iph->saddr, iph->daddr, 0);
+	th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0);
 	skb->csum_offset = offsetof(struct tcphdr, check);
 	skb->ip_summed = CHECKSUM_PARTIAL;
 	return 0;
@@ -747,7 +747,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
 	if (skb) {
 		struct tcphdr *th = skb->h.th;
 
-		th->check = tcp_v4_check(th, skb->len,
+		th->check = tcp_v4_check(skb->len,
 					 ireq->loc_addr,
 					 ireq->rmt_addr,
 					 csum_partial((char *)th, skb->len,
@@ -1514,7 +1514,7 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
 static __sum16 tcp_v4_checksum_init(struct sk_buff *skb)
 {
 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
-		if (!tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
+		if (!tcp_v4_check(skb->len, skb->nh.iph->saddr,
 				  skb->nh.iph->daddr, skb->csum)) {
 			skb->ip_summed = CHECKSUM_UNNECESSARY;
 			return 0;