TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS

[pandora-kernel.git] / include / linux / tcp.h

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 32d7d77..eaa3113 100644 (file)
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -102,7 +102,9 @@ enum {
 #define TCP_QUICKACK           12      /* Block/reenable quick acks */
 #define TCP_CONGESTION         13      /* Congestion control algorithm */
 #define TCP_MD5SIG             14      /* TCP MD5 Signature (RFC2385) */
+#define TCP_COOKIE_TRANSACTIONS        15      /* TCP Cookie Transactions */
 
+/* for TCP_INFO socket option */
 #define TCPI_OPT_TIMESTAMPS    1
 #define TCPI_OPT_SACK          2
 #define TCPI_OPT_WSCALE                4
@@ -174,6 +176,30 @@ struct tcp_md5sig {
        __u8    tcpm_key[TCP_MD5SIG_MAXKEYLEN];         /* key (binary) */
 };
 
+/* for TCP_COOKIE_TRANSACTIONS (TCPCT) socket option */
+#define TCP_COOKIE_MIN          8              /*  64-bits */
+#define TCP_COOKIE_MAX         16              /* 128-bits */
+#define TCP_COOKIE_PAIR_SIZE   (2*TCP_COOKIE_MAX)
+
+/* Flags for both getsockopt and setsockopt */
+#define TCP_COOKIE_IN_ALWAYS   (1 << 0)        /* Discard SYN without cookie */
+#define TCP_COOKIE_OUT_NEVER   (1 << 1)        /* Prohibit outgoing cookies,
+                                                * supercedes everything. */
+
+/* Flags for getsockopt */
+#define TCP_S_DATA_IN          (1 << 2)        /* Was data received? */
+#define TCP_S_DATA_OUT         (1 << 3)        /* Was data sent? */
+
+/* TCP_COOKIE_TRANSACTIONS data */
+struct tcp_cookie_transactions {
+       __u16   tcpct_flags;                    /* see above */
+       __u8    __tcpct_pad1;                   /* zero */
+       __u8    tcpct_cookie_desired;           /* bytes */
+       __u16   tcpct_s_data_desired;           /* bytes of variable data */
+       __u16   tcpct_used;                     /* bytes in value */
+       __u8    tcpct_value[TCP_MSS_DEFAULT];
+};
+
 #ifdef __KERNEL__
 
 #include <linux/skbuff.h>
@@ -227,6 +253,11 @@ struct tcp_options_received {
        u16     mss_clamp;      /* Maximal mss, negotiated at connection setup */
 };
 
+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;
+}
+
 /* This is the max number of SACKS that we'll generate and process. It's safe
  * to increse this, although since:
  *   size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
@@ -435,6 +466,6 @@ static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
        return (struct tcp_timewait_sock *)sk;
 }
 
-#endif
+#endif /* __KERNEL__ */
 
 #endif /* _LINUX_TCP_H */