Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6

[safe/jmp/linux-2.6] / include / net / tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 19f4150..325bfcf 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -62,9 +62,6 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 /* Minimal accepted MSS. It is (60+60+8) - (20+20). */
 #define TCP_MIN_MSS            88U
 
-/* Minimal RCV_MSS. */
-#define TCP_MIN_RCVMSS         536U
-
 /* The least MTU to use for probing */
 #define TCP_BASE_MSS           512
 
@@ -359,8 +356,7 @@ TCP_ECN_create_request(struct request_sock *req, struct tcphdr *th)
                inet_rsk(req)->ecn_ok = 1;
 }
 
-enum tcp_tw_status
-{
+enum tcp_tw_status {
        TCP_TW_SUCCESS = 0,
        TCP_TW_RST = 1,
        TCP_TW_ACK = 2,
@@ -394,13 +390,13 @@ extern int                        tcp_getsockopt(struct sock *sk, int level,
                                               int __user *optlen);
 extern int                     tcp_setsockopt(struct sock *sk, int level, 
                                               int optname, char __user *optval, 
-                                              int optlen);
+                                              unsigned int optlen);
 extern int                     compat_tcp_getsockopt(struct sock *sk,
                                        int level, int optname,
                                        char __user *optval, int __user *optlen);
 extern int                     compat_tcp_setsockopt(struct sock *sk,
                                        int level, int optname,
-                                       char __user *optval, int optlen);
+                                       char __user *optval, unsigned int optlen);
 extern void                    tcp_set_keepalive(struct sock *sk, int val);
 extern int                     tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
                                            struct msghdr *msg,
@@ -409,7 +405,8 @@ extern int                  tcp_recvmsg(struct kiocb *iocb, struct sock *sk,
 
 extern void                    tcp_parse_options(struct sk_buff *skb,
                                                  struct tcp_options_received *opt_rx,
-                                                 int estab);
+                                                 int estab,
+                                                 struct dst_entry *dst);
 
 extern u8                      *tcp_parse_md5sig_option(struct tcphdr *th);
 
@@ -469,6 +466,7 @@ extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
                                      int nonagle);
 extern int tcp_may_send_now(struct sock *sk);
 extern int tcp_retransmit_skb(struct sock *, struct sk_buff *);
+extern void tcp_retransmit_timer(struct sock *sk);
 extern void tcp_xmit_retransmit_queue(struct sock *);
 extern void tcp_simple_retransmit(struct sock *);
 extern int tcp_trim_head(struct sock *, struct sk_buff *, u32);
@@ -521,6 +519,17 @@ extern int tcp_mtu_to_mss(struct sock *sk, int pmtu);
 extern int tcp_mss_to_mtu(struct sock *sk, int mss);
 extern void tcp_mtup_init(struct sock *sk);
 
+static inline void tcp_bound_rto(const struct sock *sk)
+{
+       if (inet_csk(sk)->icsk_rto > TCP_RTO_MAX)
+               inet_csk(sk)->icsk_rto = TCP_RTO_MAX;
+}
+
+static inline u32 __tcp_set_rto(const struct tcp_sock *tp)
+{
+       return (tp->srtt >> 3) + tp->rttvar;
+}
+
 static inline void __tcp_fast_path_on(struct tcp_sock *tp, u32 snd_wnd)
 {
        tp->pred_flags = htonl((tp->tcp_header_len << 26) |
@@ -781,6 +790,13 @@ static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
        return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
 }
 
+#define TCP_INFINITE_SSTHRESH  0x7fffffff
+
+static inline bool tcp_in_initial_slowstart(const struct tcp_sock *tp)
+{
+       return tp->snd_ssthresh >= TCP_INFINITE_SSTHRESH;
+}
+
 /* If cwnd > ssthresh, we may raise ssthresh to be half-way to cwnd.
  * The exception is rate halving phase, when cwnd is decreasing towards
  * ssthresh.
@@ -1007,6 +1023,11 @@ static inline int keepalive_time_when(const struct tcp_sock *tp)
        return tp->keepalive_time ? : sysctl_tcp_keepalive_time;
 }
 
+static inline int keepalive_probes(const struct tcp_sock *tp)
+{
+       return tp->keepalive_probes ? : sysctl_tcp_keepalive_probes;
+}
+
 static inline int tcp_fin_time(const struct sock *sk)
 {
        int fin_timeout = tcp_sk(sk)->linger2 ? : sysctl_tcp_fin_timeout;
@@ -1169,7 +1190,7 @@ extern int                        tcp_v4_md5_do_del(struct sock *sk,
 #define tcp_twsk_md5_key(twsk) NULL
 #endif
 
-extern struct tcp_md5sig_pool  **tcp_alloc_md5sig_pool(void);
+extern struct tcp_md5sig_pool  **tcp_alloc_md5sig_pool(struct sock *);
 extern void                    tcp_free_md5sig_pool(void);
 
 extern struct tcp_md5sig_pool  *__tcp_get_md5sig_pool(int cpu);
@@ -1235,6 +1256,29 @@ static inline struct sk_buff *tcp_write_queue_prev(struct sock *sk, struct sk_bu
 #define tcp_for_write_queue_from_safe(skb, tmp, sk)                    \
        skb_queue_walk_from_safe(&(sk)->sk_write_queue, skb, tmp)
 
+/* This function calculates a "timeout" which is equivalent to the timeout of a
+ * TCP connection after "boundary" unsucessful, exponentially backed-off
+ * retransmissions with an initial RTO of TCP_RTO_MIN.
+ */
+static inline bool retransmits_timed_out(const struct sock *sk,
+                                        unsigned int boundary)
+{
+       unsigned int timeout, linear_backoff_thresh;
+
+       if (!inet_csk(sk)->icsk_retransmits)
+               return false;
+
+       linear_backoff_thresh = ilog2(TCP_RTO_MAX/TCP_RTO_MIN);
+
+       if (boundary <= linear_backoff_thresh)
+               timeout = ((2 << boundary) - 1) * TCP_RTO_MIN;
+       else
+               timeout = ((2 << linear_backoff_thresh) - 1) * TCP_RTO_MIN +
+                         (boundary - linear_backoff_thresh) * TCP_RTO_MAX;
+
+       return (tcp_time_stamp - tcp_sk(sk)->retrans_stamp) >= timeout;
+}
+
 static inline struct sk_buff *tcp_send_head(struct sock *sk)
 {
        return sk->sk_send_head;
@@ -1425,6 +1469,11 @@ struct tcp_request_sock_ops {
 #ifdef CONFIG_TCP_MD5SIG
        struct tcp_md5sig_key   *(*md5_lookup) (struct sock *sk,
                                                struct request_sock *req);
+       int                     (*calc_md5_hash) (char *location,
+                                                 struct tcp_md5sig_key *md5,
+                                                 struct sock *sk,
+                                                 struct request_sock *req,
+                                                 struct sk_buff *skb);
 #endif
 };