[Syncookies]: Add support for TCP options via timestamps.

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / net / tcp.h

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7de4ea3a04d928b12a3c93a36bfe0f9a9c6ed960..7b41bb962b9cd6c40bfde90329eb3b729facb90e 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -29,6 +29,7 @@
 #include <linux/skbuff.h>
 #include <linux/dmaengine.h>
 #include <linux/crypto.h>
+#include <linux/cryptohash.h>
 
 #include <net/inet_connection_sock.h>
 #include <net/inet_timewait_sock.h>
@@ -138,6 +139,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 #define MAX_TCP_KEEPINTVL      32767
 #define MAX_TCP_KEEPCNT                127
 #define MAX_TCP_SYNCNT         127
+#define MAX_TCP_ACCEPT_DEFERRED 65535
 
 #define TCP_SYNQ_INTERVAL      (HZ/5)  /* Period of SYNACK timer */
 
@@ -434,11 +436,20 @@ extern int                        tcp_disconnect(struct sock *sk, int flags);
 extern void                    tcp_unhash(struct sock *sk);
 
 /* From syncookies.c */
+extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS];
 extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, 
                                    struct ip_options *opt);
 extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, 
                                     __u16 *mss);
 
+extern __u32 cookie_init_timestamp(struct request_sock *req);
+extern void cookie_check_timestamp(struct tcp_options_received *tcp_opt);
+
+/* From net/ipv6/syncookies.c */
+extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
+extern __u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb,
+                                    __u16 *mss);
+
 /* tcp_output.c */
 
 extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
@@ -948,6 +959,7 @@ static inline void tcp_openreq_init(struct request_sock *req,
        struct inet_request_sock *ireq = inet_rsk(req);
 
        req->rcv_wnd = 0;               /* So that tcp_send_synack() knows! */
+       req->cookie_ts = 0;
        tcp_rsk(req)->rcv_isn = TCP_SKB_CB(skb)->seq;
        req->mss = rx_opt->mss_clamp;
        req->ts_recent = rx_opt->saw_tstamp ? rx_opt->rcv_tsval : 0;
@@ -1321,6 +1333,7 @@ struct tcp_seq_afinfo {
 };
 
 struct tcp_iter_state {
+       struct net              *net;
        sa_family_t             family;
        enum tcp_seq_states     state;
        struct sock             *syn_wait_sk;
@@ -1328,10 +1341,11 @@ struct tcp_iter_state {
        struct seq_operations   seq_ops;
 };
 
-extern int tcp_proc_register(struct tcp_seq_afinfo *afinfo);
-extern void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo);
+extern int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo);
+extern void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo);
 
 extern struct request_sock_ops tcp_request_sock_ops;
+extern struct request_sock_ops tcp6_request_sock_ops;
 
 extern int tcp_v4_destroy_sock(struct sock *sk);
 
@@ -1373,7 +1387,7 @@ struct tcp_request_sock_ops {
 #endif
 };
 
-extern void tcp_v4_init(struct net_proto_family *ops);
+extern void tcp_v4_init(void);
 extern void tcp_init(void);
 
 #endif /* _TCP_H */