[TCP]: Don't panic if S+L skb is detected

[linux-2.6-omap-h63xx.git] / include / net / tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 8b404b1ef7c8ed7ba6025e8e7dab582105b0c1ae..b92bdc7c92a973c4134cac8ba914206c684e87bc 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -39,6 +39,7 @@
 #include <net/snmp.h>
 #include <net/ip.h>
 #include <net/tcp_states.h>
+#include <net/inet_ecn.h>
 
 #include <linux/seq_file.h>
 
@@ -281,7 +282,7 @@ extern int                  tcp_v4_remember_stamp(struct sock *sk);
 
 extern int                     tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw);
 
-extern int                     tcp_sendmsg(struct kiocb *iocb, struct sock *sk,
+extern int                     tcp_sendmsg(struct kiocb *iocb, struct socket *sock,
                                            struct msghdr *msg, size_t size);
 extern ssize_t                 tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags);
 
@@ -330,6 +331,17 @@ static inline void tcp_clear_options(struct tcp_options_received *rx_opt)
        rx_opt->tstamp_ok = rx_opt->sack_ok = rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
 }
 
+#define        TCP_ECN_OK              1
+#define        TCP_ECN_QUEUE_CWR       2
+#define        TCP_ECN_DEMAND_CWR      4
+
+static __inline__ void
+TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
+{
+       if (sysctl_tcp_ecn && th->ece && th->cwr)
+               inet_rsk(req)->ecn_ok = 1;
+}
+
 enum tcp_tw_status
 {
        TCP_TW_SUCCESS = 0,
@@ -573,8 +585,6 @@ struct tcp_skb_cb {
 
 #define TCP_SKB_CB(__skb)      ((struct tcp_skb_cb *)&((__skb)->cb[0]))
 
-#include <net/tcp_ecn.h>
-
 /* Due to TSO, an SKB can be composed of multiple actual
  * packets.  To keep these tracked properly, we use this.
  */
@@ -589,16 +599,21 @@ static inline int tcp_skb_mss(const struct sk_buff *skb)
        return skb_shinfo(skb)->gso_size;
 }
 
-static inline void tcp_dec_pcount_approx(__u32 *count,
-                                        const struct sk_buff *skb)
+static inline void tcp_dec_pcount_approx_int(__u32 *count, const int decr)
 {
        if (*count) {
-               *count -= tcp_skb_pcount(skb);
+               *count -= decr;
                if ((int)*count < 0)
                        *count = 0;
        }
 }
 
+static inline void tcp_dec_pcount_approx(__u32 *count,
+                                        const struct sk_buff *skb)
+{
+       tcp_dec_pcount_approx_int(count, tcp_skb_pcount(skb));
+}
+
 static inline void tcp_packets_out_inc(struct sock *sk,
                                       const struct sk_buff *skb)
 {
@@ -660,7 +675,7 @@ struct tcp_congestion_ops {
        /* new value of cwnd after loss (optional) */
        u32  (*undo_cwnd)(struct sock *sk);
        /* hook for packet ack accounting (optional) */
-       void (*pkts_acked)(struct sock *sk, u32 num_acked, ktime_t last);
+       void (*pkts_acked)(struct sock *sk, u32 num_acked, s32 rtt_us);
        /* get info for inet_diag (optional) */
        void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb);
 
@@ -704,6 +719,11 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
                icsk->icsk_ca_ops->cwnd_event(sk, event);
 }
 
+static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
+{
+       return tp->sacked_out + tp->lost_out;
+}
+
 /* This determines how many packets are "in the network" to the best
  * of our knowledge.  In many cases it is conservative, but where
  * detailed information is available from the receiver (via SACK
@@ -720,7 +740,7 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
  */
 static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
 {
-       return (tp->packets_out - tp->left_out + tp->retrans_out);
+       return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
 }
 
 /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
@@ -738,12 +758,8 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
                            (tp->snd_cwnd >> 2)));
 }
 
-static inline void tcp_sync_left_out(struct tcp_sock *tp)
-{
-       BUG_ON(tp->rx_opt.sack_ok &&
-              (tp->sacked_out + tp->lost_out > tp->packets_out));
-       tp->left_out = tp->sacked_out + tp->lost_out;
-}
+/* Use define here intentionally to get WARN_ON location shown at the caller */
+#define tcp_verify_left_out(tp)        WARN_ON(tcp_left_out(tp) > tp->packets_out)
 
 extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
 extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
@@ -1059,14 +1075,12 @@ struct tcp_md5sig_key {
 };
 
 struct tcp4_md5sig_key {
-       u8                      *key;
-       u16                     keylen;
+       struct tcp_md5sig_key   base;
        __be32                  addr;
 };
 
 struct tcp6_md5sig_key {
-       u8                      *key;
-       u16                     keylen;
+       struct tcp_md5sig_key   base;
 #if 0
        u32                     scope_id;       /* XXX */
 #endif