X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Ftcp.h;h=a778ee024590dafb3357caed05da1cb1f6133821;hb=933af4a6c4913ab4c0691c8fb27fc305063889cd;hp=9d5078bd23a38a08285e81d4d4e63407646ff873;hpb=2a3a041c4e2c1685e668b280c121a5a40a029a03;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 9d5078b..a778ee0 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -81,6 +81,12 @@ enum {
 	TCP_DATA_OFFSET = __cpu_to_be32(0xF0000000)
 }; 
 
+/*
+ * TCP general constants
+ */
+#define TCP_MSS_DEFAULT		 536U	/* IPv4 (RFC1122, RFC2581) */
+#define TCP_MSS_DESIRED		1220U	/* IPv6 (tunneled), EDNS0 (RFC3226) */
+
 /* TCP socket options */
 #define TCP_NODELAY		1	/* Turn off Nagle's algorithm. */
 #define TCP_MAXSEG		2	/* Limit MSS */
@@ -96,14 +102,17 @@ 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 */
+#define TCP_THIN_LINEAR_TIMEOUTS 16      /* Use linear timeouts for thin streams*/
+#define TCP_THIN_DUPACK         17      /* Fast retrans. after 1 dupack */
 
+/* for TCP_INFO socket option */
 #define TCPI_OPT_TIMESTAMPS	1
 #define TCPI_OPT_SACK		2
 #define TCPI_OPT_WSCALE		4
 #define TCPI_OPT_ECN		8
 
-enum tcp_ca_state
-{
+enum tcp_ca_state {
 	TCP_CA_Open = 0,
 #define TCPF_CA_Open	(1<<TCP_CA_Open)
 	TCP_CA_Disorder = 1,
@@ -116,8 +125,7 @@ enum tcp_ca_state
 #define TCPF_CA_Loss	(1<<TCP_CA_Loss)
 };
 
-struct tcp_info
-{
+struct tcp_info {
 	__u8	tcpi_state;
 	__u8	tcpi_ca_state;
 	__u8	tcpi_retransmits;
@@ -170,6 +178,30 @@ 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>
@@ -217,26 +249,38 @@ struct tcp_options_received {
 		sack_ok : 4,	/* SACK seen on SYN packet		*/
 		snd_wscale : 4,	/* Window scaling received from sender	*/
 		rcv_wscale : 4;	/* Window scaling to send to receiver	*/
-/*	SACKs data	*/
+	u8	cookie_plus:6,	/* bytes in authenticator/cookie option	*/
+		cookie_out_never:1,
+		cookie_in_always:1;
 	u8	num_sacks;	/* Number of SACK blocks		*/
-	u16	user_mss;  	/* mss requested by user in ioctl */
+	u16	user_mss;	/* mss requested by user in ioctl	*/
 	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 = 0;
+	rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
+	rx_opt->cookie_plus = 0;
+}
+
 /* This is the max number of SACKS that we'll generate and process. It's safe
- * to increse this, although since:
+ * to increase this, although since:
  *   size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
  * only four options will fit in a standard TCP header */
 #define TCP_NUM_SACKS 4
 
+struct tcp_cookie_values;
+struct tcp_request_sock_ops;
+
 struct tcp_request_sock {
 	struct inet_request_sock 	req;
 #ifdef CONFIG_TCP_MD5SIG
 	/* Only used by TCP MD5 Signature so far. */
-	struct tcp_request_sock_ops	*af_specific;
+	const struct tcp_request_sock_ops *af_specific;
 #endif
-	u32			 	rcv_isn;
-	u32			 	snt_isn;
+	u32				rcv_isn;
+	u32				snt_isn;
 };
 
 static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
@@ -298,7 +342,10 @@ struct tcp_sock {
 	u32	frto_highmark;	/* snd_nxt when RTO occurred */
 	u16	advmss;		/* Advertised MSS			*/
 	u8	frto_counter;	/* Number of new acks after RTO */
-	u8	nonagle;	/* Disable Nagle algorithm?             */
+	u8	nonagle     : 4,/* Disable Nagle algorithm?             */
+		thin_lto    : 1,/* Use linear timeouts for thin streams */
+		thin_dupack : 1,/* Fast retransmit on first dupack      */
+		unused      : 2;
 
 /* RTT measurement */
 	u32	srtt;		/* smoothed round trip time << 3	*/
@@ -377,7 +424,7 @@ struct tcp_sock {
 	unsigned int		keepalive_time;	  /* time before keep alive takes place */
 	unsigned int		keepalive_intvl;  /* time interval between keep alive probes */
 
-	unsigned long last_synq_overflow; 
+	int			linger2;
 
 /* Receiver side RTT estimation */
 	struct {
@@ -401,13 +448,17 @@ struct tcp_sock {
 
 #ifdef CONFIG_TCP_MD5SIG
 /* TCP AF-Specific parts; only used by MD5 Signature support so far */
-	struct tcp_sock_af_ops	*af_specific;
+	const struct tcp_sock_af_ops	*af_specific;
 
-/* TCP MD5 Signagure Option information */
+/* TCP MD5 Signature Option information */
 	struct tcp_md5sig_info	*md5sig_info;
 #endif
 
-	int			linger2;
+	/* When the cookie options are generated and exchanged, then this
+	 * object holds a reference to them (cookie_values->kref).  Also
+	 * contains related tcp_cookie_transactions fields.
+	 */
+	struct tcp_cookie_values  *cookie_values;
 };
 
 static inline struct tcp_sock *tcp_sk(const struct sock *sk)
@@ -426,6 +477,10 @@ struct tcp_timewait_sock {
 	u16			  tw_md5_keylen;
 	u8			  tw_md5_key[TCP_MD5SIG_MAXKEYLEN];
 #endif
+	/* Few sockets in timewait have cookies; in that case, then this
+	 * object holds a reference to them (tw_cookie_values->kref).
+	 */
+	struct tcp_cookie_values  *tw_cookie_values;
 };
 
 static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
@@ -433,6 +488,6 @@ 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 */