#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
enum {
- TCP_FLAG_CWR = __constant_htonl(0x00800000),
- TCP_FLAG_ECE = __constant_htonl(0x00400000),
- TCP_FLAG_URG = __constant_htonl(0x00200000),
- TCP_FLAG_ACK = __constant_htonl(0x00100000),
- TCP_FLAG_PSH = __constant_htonl(0x00080000),
- TCP_FLAG_RST = __constant_htonl(0x00040000),
- TCP_FLAG_SYN = __constant_htonl(0x00020000),
- TCP_FLAG_FIN = __constant_htonl(0x00010000),
- TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
- TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
+ TCP_FLAG_CWR = __cpu_to_be32(0x00800000),
+ TCP_FLAG_ECE = __cpu_to_be32(0x00400000),
+ TCP_FLAG_URG = __cpu_to_be32(0x00200000),
+ TCP_FLAG_ACK = __cpu_to_be32(0x00100000),
+ TCP_FLAG_PSH = __cpu_to_be32(0x00080000),
+ TCP_FLAG_RST = __cpu_to_be32(0x00040000),
+ TCP_FLAG_SYN = __cpu_to_be32(0x00020000),
+ TCP_FLAG_FIN = __cpu_to_be32(0x00010000),
+ TCP_RESERVED_BITS = __cpu_to_be32(0x0F000000),
+ 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 */
#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
#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,
#define TCPF_CA_Loss (1<<TCP_CA_Loss)
};
-struct tcp_info
-{
+struct tcp_info {
__u8 tcpi_state;
__u8 tcpi_ca_state;
__u8 tcpi_retransmits;
__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>
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 eff_sacks; /* Size of SACK array to send with next packet */
+ 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 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)
/* inet_connection_sock has to be the first member of tcp_sock */
struct inet_connection_sock inet_conn;
u16 tcp_header_len; /* Bytes of tcp header to send */
- u16 xmit_size_goal; /* Goal for segmenting output packets */
+ u16 xmit_size_goal_segs; /* Goal for segmenting output packets */
/*
* Header prediction flags
u32 rcv_ssthresh; /* Current window clamp */
u32 frto_highmark; /* snd_nxt when RTO occurred */
- u8 reordering; /* Packet reordering metric. */
+ u16 advmss; /* Advertised MSS */
u8 frto_counter; /* Number of new acks after RTO */
u8 nonagle; /* Disable Nagle algorithm? */
- u8 keepalive_probes; /* num of allowed keep alive probes */
/* RTT measurement */
u32 srtt; /* smoothed round trip time << 3 */
u32 packets_out; /* Packets which are "in flight" */
u32 retrans_out; /* Retransmitted packets out */
+
+ u16 urg_data; /* Saved octet of OOB data and control flags */
+ u8 ecn_flags; /* ECN status bits. */
+ u8 reordering; /* Packet reordering metric. */
+ u32 snd_up; /* Urgent pointer */
+
+ u8 keepalive_probes; /* num of allowed keep alive probes */
/*
* Options received (usually on last packet, some only on SYN packets).
*/
*/
u32 snd_ssthresh; /* Slow start size threshold */
u32 snd_cwnd; /* Sending congestion window */
- u16 snd_cwnd_cnt; /* Linear increase counter */
+ u32 snd_cwnd_cnt; /* Linear increase counter */
u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
u32 snd_cwnd_used;
u32 snd_cwnd_stamp;
- struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
-
u32 rcv_wnd; /* Current receiver window */
u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
u32 pushed_seq; /* Last pushed seq, required to talk to windows */
-
-/* SACKs data */
- struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
- struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
-
- struct tcp_sack_block_wire recv_sack_cache[4];
-
- u32 highest_sack; /* Start seq of globally highest revd SACK
- * (validity guaranteed only if sacked_out > 0) */
+ u32 lost_out; /* Lost packets */
+ u32 sacked_out; /* SACK'd packets */
+ u32 fackets_out; /* FACK'd packets */
+ u32 tso_deferred;
+ u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */
/* from STCP, retrans queue hinting */
struct sk_buff* lost_skb_hint;
-
struct sk_buff *scoreboard_skb_hint;
struct sk_buff *retransmit_skb_hint;
- struct sk_buff *forward_skb_hint;
- struct sk_buff *fastpath_skb_hint;
- int fastpath_cnt_hint; /* Lags behind by current skb's pcount
- * compared to respective fackets_out */
+ struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
+
+ /* SACKs data, these 2 need to be together (see tcp_build_and_update_options) */
+ struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
+ struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
+
+ struct tcp_sack_block recv_sack_cache[4];
+
+ struct sk_buff *highest_sack; /* highest skb with SACK received
+ * (validity guaranteed only if
+ * sacked_out > 0)
+ */
+
int lost_cnt_hint;
- int retransmit_cnt_hint;
+ u32 retransmit_high; /* L-bits may be on up to this seqno */
u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */
- u16 advmss; /* Advertised MSS */
- u16 prior_ssthresh; /* ssthresh saved at recovery start */
- u32 lost_out; /* Lost packets */
- u32 sacked_out; /* SACK'd packets */
- u32 fackets_out; /* FACK'd packets */
+ u32 prior_ssthresh; /* ssthresh saved at recovery start */
u32 high_seq; /* snd_nxt at onset of congestion */
u32 retrans_stamp; /* Timestamp of the last retransmit,
* the first SYN. */
u32 undo_marker; /* tracking retrans started here. */
int undo_retrans; /* number of undoable retransmissions. */
- u32 urg_seq; /* Seq of received urgent pointer */
- u16 urg_data; /* Saved octet of OOB data and control flags */
- u8 urg_mode; /* In urgent mode */
- u8 ecn_flags; /* ECN status bits. */
- u32 snd_up; /* Urgent pointer */
-
u32 total_retrans; /* Total retransmits for entire connection */
- u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */
+ u32 urg_seq; /* Seq of received urgent pointer */
unsigned int keepalive_time; /* time before keep alive takes place */
unsigned int keepalive_intvl; /* time interval between keep alive probes */
- int linger2;
- unsigned long last_synq_overflow;
-
- u32 tso_deferred;
+ int linger2;
/* Receiver side RTT estimation */
struct {
#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
+
+ /* 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)
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)
return (struct tcp_timewait_sock *)sk;
}
-#endif
+#endif /* __KERNEL__ */
#endif /* _LINUX_TCP_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff