[SK_BUFF]: Introduce tcp_hdr(), remove skb->h.th

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 18 deletions

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 261607178491..2da1be0589a9 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -125,10 +125,11 @@ static __u16 const msstab[] = {
 __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
 {
         struct tcp_sock *tp = tcp_sk(sk);
+        const struct iphdr *iph = ip_hdr(skb);
+        const struct tcphdr *th = tcp_hdr(skb);
         int mssind;
         const __u16 mss = *mssp;
 
-
         tp->last_synq_overflow = jiffies;
 
         /* XXX sort msstab[] by probability?  Binary search? */
@@ -138,9 +139,8 @@ __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
 
         NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESSENT);
 
-        return secure_tcp_syn_cookie(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
-                                     skb->h.th->source, skb->h.th->dest,
-                                     ntohl(skb->h.th->seq),
+        return secure_tcp_syn_cookie(iph->saddr, iph->daddr,
+                                     th->source, th->dest, ntohl(th->seq),
                                      jiffies / (HZ * 60), mssind);
 }
 
@@ -157,14 +157,13 @@ __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
  */
 static inline int cookie_check(struct sk_buff *skb, __u32 cookie)
 {
-        __u32 seq;
-        __u32 mssind;
-
-        seq = ntohl(skb->h.th->seq)-1;
-        mssind = check_tcp_syn_cookie(cookie,
-                                      ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
-                                      skb->h.th->source, skb->h.th->dest,
-                                      seq, jiffies / (HZ * 60), COUNTER_TRIES);
+        const struct iphdr *iph = ip_hdr(skb);
+        const struct tcphdr *th = tcp_hdr(skb);
+        __u32 seq = ntohl(th->seq) - 1;
+        __u32 mssind = check_tcp_syn_cookie(cookie, iph->saddr, iph->daddr,
+                                            th->source, th->dest, seq,
+                                            jiffies / (HZ * 60),
+                                            COUNTER_TRIES);
 
         return mssind < NUM_MSS ? msstab[mssind] + 1 : 0;
 }
@@ -191,14 +190,15 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
         struct inet_request_sock *ireq;
         struct tcp_request_sock *treq;
         struct tcp_sock *tp = tcp_sk(sk);
-        __u32 cookie = ntohl(skb->h.th->ack_seq) - 1;
+        const struct tcphdr *th = tcp_hdr(skb);
+        __u32 cookie = ntohl(th->ack_seq) - 1;
         struct sock *ret = sk;
         struct request_sock *req;
         int mss;
         struct rtable *rt;
         __u8 rcv_wscale;
 
-        if (!sysctl_tcp_syncookies || !skb->h.th->ack)
+        if (!sysctl_tcp_syncookies || !th->ack)
                 goto out;
 
         if (time_after(jiffies, tp->last_synq_overflow + TCP_TIMEOUT_INIT) ||
@@ -220,10 +220,10 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
         }
         ireq = inet_rsk(req);
         treq = tcp_rsk(req);
-        treq->rcv_isn           = ntohl(skb->h.th->seq) - 1;
+        treq->rcv_isn           = ntohl(th->seq) - 1;
         treq->snt_isn           = cookie;
         req->mss                = mss;
-        ireq->rmt_port          = skb->h.th->source;
+        ireq->rmt_port          = th->source;
         ireq->loc_addr          = ip_hdr(skb)->daddr;
         ireq->rmt_addr          = ip_hdr(skb)->saddr;
         ireq->opt               = NULL;
@@ -261,8 +261,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
                                                 .tos = RT_CONN_FLAGS(sk) } },
                                     .proto = IPPROTO_TCP,
                                     .uli_u = { .ports =
-                                               { .sport = skb->h.th->dest,
-                                                 .dport = skb->h.th->source } } };
+                                               { .sport = th->dest,
+                                                 .dport = th->source } } };
                 security_req_classify_flow(req, &fl);
                 if (ip_route_output_key(&rt, &fl)) {
                         reqsk_free(req);