[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, 15 insertions, 13 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2776a8b01339..c1ce36237380 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -148,7 +148,7 @@ static void tcp_measure_rcv_mss(struct sock *sk,
                      * to handle super-low mtu links fairly.
                      */
                     (len >= TCP_MIN_MSS + sizeof(struct tcphdr) &&
-                     !(tcp_flag_word(skb->h.th)&TCP_REMNANT))) {
+                     !(tcp_flag_word(tcp_hdr(skb)) & TCP_REMNANT))) {
                         /* Subtract also invariant (if peer is RFC compliant),
                          * tcp header plus fixed timestamp option length.
                          * Resulting "len" is MSS free of SACK jitter.
@@ -2559,9 +2559,9 @@ static int tcp_ack_update_window(struct sock *sk, struct tcp_sock *tp,
                                  struct sk_buff *skb, u32 ack, u32 ack_seq)
 {
         int flag = 0;
-        u32 nwin = ntohs(skb->h.th->window);
+        u32 nwin = ntohs(tcp_hdr(skb)->window);
 
-        if (likely(!skb->h.th->syn))
+        if (likely(!tcp_hdr(skb)->syn))
                 nwin <<= tp->rx_opt.snd_wscale;
 
         if (tcp_may_update_window(tp, ack, ack_seq, nwin)) {
@@ -2766,7 +2766,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
                 if (TCP_SKB_CB(skb)->sacked)
                         flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una);
 
-                if (TCP_ECN_rcv_ecn_echo(tp, skb->h.th))
+                if (TCP_ECN_rcv_ecn_echo(tp, tcp_hdr(skb)))
                         flag |= FLAG_ECE;
 
                 tcp_ca_event(sk, CA_EVENT_SLOW_ACK);
@@ -2833,7 +2833,7 @@ uninteresting_ack:
 void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx, int estab)
 {
         unsigned char *ptr;
-        struct tcphdr *th = skb->h.th;
+        struct tcphdr *th = tcp_hdr(skb);
         int length=(th->doff*4)-sizeof(struct tcphdr);
 
         ptr = (unsigned char *)(th + 1);
@@ -2995,7 +2995,7 @@ static inline void tcp_replace_ts_recent(struct tcp_sock *tp, u32 seq)
 static int tcp_disordered_ack(const struct sock *sk, const struct sk_buff *skb)
 {
         struct tcp_sock *tp = tcp_sk(sk);
-        struct tcphdr *th = skb->h.th;
+        struct tcphdr *th = tcp_hdr(skb);
         u32 seq = TCP_SKB_CB(skb)->seq;
         u32 ack = TCP_SKB_CB(skb)->ack_seq;
 
@@ -3357,8 +3357,8 @@ static void tcp_ofo_queue(struct sock *sk)
                 __skb_unlink(skb, &tp->out_of_order_queue);
                 __skb_queue_tail(&sk->sk_receive_queue, skb);
                 tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
-                if (skb->h.th->fin)
-                        tcp_fin(skb, sk, skb->h.th);
+                if (tcp_hdr(skb)->fin)
+                        tcp_fin(skb, sk, tcp_hdr(skb));
         }
 }
 
@@ -3366,7 +3366,7 @@ static int tcp_prune_queue(struct sock *sk);
 
 static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
 {
-        struct tcphdr *th = skb->h.th;
+        struct tcphdr *th = tcp_hdr(skb);
         struct tcp_sock *tp = tcp_sk(sk);
         int eaten = -1;
 
@@ -3605,7 +3605,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
                  * - bloated or contains data before "start" or
                  *   overlaps to the next one.
                  */
-                if (!skb->h.th->syn && !skb->h.th->fin &&
+                if (!tcp_hdr(skb)->syn && !tcp_hdr(skb)->fin &&
                     (tcp_win_from_space(skb->truesize) > skb->len ||
                      before(TCP_SKB_CB(skb)->seq, start) ||
                      (skb->next != tail &&
@@ -3616,7 +3616,7 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
                 start = TCP_SKB_CB(skb)->end_seq;
                 skb = skb->next;
         }
-        if (skb == tail || skb->h.th->syn || skb->h.th->fin)
+        if (skb == tail || tcp_hdr(skb)->syn || tcp_hdr(skb)->fin)
                 return;
 
         while (before(start, end)) {
@@ -3665,7 +3665,9 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
                                 __kfree_skb(skb);
                                 NET_INC_STATS_BH(LINUX_MIB_TCPRCVCOLLAPSED);
                                 skb = next;
-                                if (skb == tail || skb->h.th->syn || skb->h.th->fin)
+                                if (skb == tail ||
+                                    tcp_hdr(skb)->syn ||
+                                    tcp_hdr(skb)->fin)
                                         return;
                         }
                 }
@@ -4072,7 +4074,7 @@ static int tcp_dma_try_early_copy(struct sock *sk, struct sk_buff *skb, int hlen
                 tcp_rcv_space_adjust(sk);
 
                 if ((tp->ucopy.len == 0) ||
-                    (tcp_flag_word(skb->h.th) & TCP_FLAG_PSH) ||
+                    (tcp_flag_word(tcp_hdr(skb)) & TCP_FLAG_PSH) ||
                     (atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1))) {
                         tp->ucopy.wakeup = 1;
                         sk->sk_data_ready(sk, 0);