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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for the TCP protocol.
7 *
8 * Version: @(#)tcp.h 1.0.2 04/28/93
9 *
10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17#ifndef _LINUX_TCP_H
18#define _LINUX_TCP_H
19
20#include <linux/types.h>
21#include <asm/byteorder.h>
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -080022#include <linux/socket.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24struct tcphdr {
Al Viro46a97322006-09-27 18:31:51 -070025 __be16 source;
26 __be16 dest;
27 __be32 seq;
28 __be32 ack_seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#if defined(__LITTLE_ENDIAN_BITFIELD)
30 __u16 res1:4,
31 doff:4,
32 fin:1,
33 syn:1,
34 rst:1,
35 psh:1,
36 ack:1,
37 urg:1,
38 ece:1,
39 cwr:1;
40#elif defined(__BIG_ENDIAN_BITFIELD)
41 __u16 doff:4,
42 res1:4,
43 cwr:1,
44 ece:1,
45 urg:1,
46 ack:1,
47 psh:1,
48 rst:1,
49 syn:1,
50 fin:1;
51#else
52#error "Adjust your <asm/byteorder.h> defines"
53#endif
Al Viro46a97322006-09-27 18:31:51 -070054 __be16 window;
Al Viro9981a0e2006-11-14 21:24:30 -080055 __sum16 check;
Al Viro46a97322006-09-27 18:31:51 -070056 __be16 urg_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057};
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/*
60 * The union cast uses a gcc extension to avoid aliasing problems
61 * (union is compatible to any of its members)
62 * This means this part of the code is -fstrict-aliasing safe now.
63 */
64union tcp_word_hdr {
65 struct tcphdr hdr;
Al Viro46a97322006-09-27 18:31:51 -070066 __be32 words[5];
Linus Torvalds1da177e2005-04-16 15:20:36 -070067};
68
69#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
70
71enum {
Harvey Harrisonf3a7c662009-02-14 22:58:35 -080072 TCP_FLAG_CWR = __cpu_to_be32(0x00800000),
73 TCP_FLAG_ECE = __cpu_to_be32(0x00400000),
74 TCP_FLAG_URG = __cpu_to_be32(0x00200000),
75 TCP_FLAG_ACK = __cpu_to_be32(0x00100000),
76 TCP_FLAG_PSH = __cpu_to_be32(0x00080000),
77 TCP_FLAG_RST = __cpu_to_be32(0x00040000),
78 TCP_FLAG_SYN = __cpu_to_be32(0x00020000),
79 TCP_FLAG_FIN = __cpu_to_be32(0x00010000),
80 TCP_RESERVED_BITS = __cpu_to_be32(0x0F000000),
81 TCP_DATA_OFFSET = __cpu_to_be32(0xF0000000)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
84/* TCP socket options */
85#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
86#define TCP_MAXSEG 2 /* Limit MSS */
87#define TCP_CORK 3 /* Never send partially complete segments */
88#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
89#define TCP_KEEPINTVL 5 /* Interval between keepalives */
90#define TCP_KEEPCNT 6 /* Number of keepalives before death */
91#define TCP_SYNCNT 7 /* Number of SYN retransmits */
92#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
93#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
94#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
95#define TCP_INFO 11 /* Information about this connection. */
96#define TCP_QUICKACK 12 /* Block/reenable quick acks */
Stephen Hemminger5f8ef482005-06-23 20:37:36 -070097#define TCP_CONGESTION 13 /* Congestion control algorithm */
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -080098#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100#define TCPI_OPT_TIMESTAMPS 1
101#define TCPI_OPT_SACK 2
102#define TCPI_OPT_WSCALE 4
103#define TCPI_OPT_ECN 8
104
105enum tcp_ca_state
106{
107 TCP_CA_Open = 0,
108#define TCPF_CA_Open (1<<TCP_CA_Open)
109 TCP_CA_Disorder = 1,
110#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
111 TCP_CA_CWR = 2,
112#define TCPF_CA_CWR (1<<TCP_CA_CWR)
113 TCP_CA_Recovery = 3,
114#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
115 TCP_CA_Loss = 4
116#define TCPF_CA_Loss (1<<TCP_CA_Loss)
117};
118
119struct tcp_info
120{
121 __u8 tcpi_state;
122 __u8 tcpi_ca_state;
123 __u8 tcpi_retransmits;
124 __u8 tcpi_probes;
125 __u8 tcpi_backoff;
126 __u8 tcpi_options;
127 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
128
129 __u32 tcpi_rto;
130 __u32 tcpi_ato;
131 __u32 tcpi_snd_mss;
132 __u32 tcpi_rcv_mss;
133
134 __u32 tcpi_unacked;
135 __u32 tcpi_sacked;
136 __u32 tcpi_lost;
137 __u32 tcpi_retrans;
138 __u32 tcpi_fackets;
139
140 /* Times. */
141 __u32 tcpi_last_data_sent;
142 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
143 __u32 tcpi_last_data_recv;
144 __u32 tcpi_last_ack_recv;
145
146 /* Metrics. */
147 __u32 tcpi_pmtu;
148 __u32 tcpi_rcv_ssthresh;
149 __u32 tcpi_rtt;
150 __u32 tcpi_rttvar;
151 __u32 tcpi_snd_ssthresh;
152 __u32 tcpi_snd_cwnd;
153 __u32 tcpi_advmss;
154 __u32 tcpi_reordering;
155
156 __u32 tcpi_rcv_rtt;
157 __u32 tcpi_rcv_space;
158
159 __u32 tcpi_total_retrans;
160};
161
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800162/* for TCP_MD5SIG socket option */
163#define TCP_MD5SIG_MAXKEYLEN 80
164
165struct tcp_md5sig {
166 struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
167 __u16 __tcpm_pad1; /* zero */
168 __u16 tcpm_keylen; /* key length */
169 __u32 __tcpm_pad2; /* zero */
170 __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
171};
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173#ifdef __KERNEL__
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175#include <linux/skbuff.h>
David Woodhousec8a553ad2006-06-22 14:28:09 -0700176#include <linux/dmaengine.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177#include <net/sock.h>
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700178#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700179#include <net/inet_timewait_sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Arnaldo Carvalho de Meloaa8223c2007-04-10 21:04:22 -0700181static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
182{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700183 return (struct tcphdr *)skb_transport_header(skb);
Arnaldo Carvalho de Meloaa8223c2007-04-10 21:04:22 -0700184}
185
Arnaldo Carvalho de Meloab6a5bb2007-03-18 17:43:48 -0700186static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
187{
Arnaldo Carvalho de Meloaa8223c2007-04-10 21:04:22 -0700188 return tcp_hdr(skb)->doff * 4;
Arnaldo Carvalho de Meloab6a5bb2007-03-18 17:43:48 -0700189}
190
191static inline unsigned int tcp_optlen(const struct sk_buff *skb)
192{
Arnaldo Carvalho de Meloaa8223c2007-04-10 21:04:22 -0700193 return (tcp_hdr(skb)->doff - 5) * 4;
Arnaldo Carvalho de Meloab6a5bb2007-03-18 17:43:48 -0700194}
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196/* This defines a selective acknowledgement block. */
Al Viro269bd272006-09-27 18:32:28 -0700197struct tcp_sack_block_wire {
198 __be32 start_seq;
199 __be32 end_seq;
200};
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202struct tcp_sack_block {
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200203 u32 start_seq;
204 u32 end_seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205};
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207struct tcp_options_received {
208/* PAWS/RTTM data */
209 long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200210 u32 ts_recent; /* Time stamp to echo next */
211 u32 rcv_tsval; /* Time stamp value */
212 u32 rcv_tsecr; /* Time stamp echo reply */
213 u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */
215 dsack : 1, /* D-SACK is scheduled */
216 wscale_ok : 1, /* Wscale seen on SYN packet */
217 sack_ok : 4, /* SACK seen on SYN packet */
218 snd_wscale : 4, /* Window scaling received from sender */
219 rcv_wscale : 4; /* Window scaling to send to receiver */
220/* SACKs data */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200221 u8 num_sacks; /* Number of SACK blocks */
222 u16 user_mss; /* mss requested by user in ioctl */
223 u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224};
225
Adam Langley4389dde2008-07-19 00:07:02 -0700226/* This is the max number of SACKS that we'll generate and process. It's safe
227 * to increse this, although since:
228 * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
229 * only four options will fit in a standard TCP header */
230#define TCP_NUM_SACKS 4
231
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700232struct tcp_request_sock {
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800233 struct inet_request_sock req;
234#ifdef CONFIG_TCP_MD5SIG
235 /* Only used by TCP MD5 Signature so far. */
236 struct tcp_request_sock_ops *af_specific;
237#endif
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200238 u32 rcv_isn;
239 u32 snt_isn;
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700240};
241
Arnaldo Carvalho de Melo60236fd2005-06-18 22:47:21 -0700242static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
Arnaldo Carvalho de Melo2e6599c2005-06-18 22:46:52 -0700243{
244 return (struct tcp_request_sock *)req;
245}
246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247struct tcp_sock {
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -0700248 /* inet_connection_sock has to be the first member of tcp_sock */
249 struct inet_connection_sock inet_conn;
Arnaldo Carvalho de Melo2ff52f22006-11-28 00:48:32 -0200250 u16 tcp_header_len; /* Bytes of tcp header to send */
Ilpo Järvinen2a3a0412009-03-14 22:45:16 +0000251 u16 xmit_size_goal_segs; /* Goal for segmenting output packets */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
253/*
254 * Header prediction flags
255 * 0x5?10 << 16 + snd_wnd in net byte order
256 */
Al Virodddc93c2006-09-27 18:32:46 -0700257 __be32 pred_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259/*
260 * RFC793 variables by their proper names. This means you can
261 * read the code and the spec side by side (and laugh ...)
262 * See RFC793 and RFC1122. The RFC writes these in capitals.
263 */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200264 u32 rcv_nxt; /* What we want to receive next */
Eric Dumazet54287cc2007-02-22 03:20:44 -0800265 u32 copied_seq; /* Head of yet unread data */
266 u32 rcv_wup; /* rcv_nxt on last window update sent */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200267 u32 snd_nxt; /* Next sequence we send */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200269 u32 snd_una; /* First byte we want an ack for */
270 u32 snd_sml; /* Last byte of the most recently transmitted small packet */
271 u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
272 u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 /* Data for direct copy to user */
275 struct {
276 struct sk_buff_head prequeue;
277 struct task_struct *task;
278 struct iovec *iov;
279 int memory;
280 int len;
Chris Leech97fc2f02006-05-23 17:55:33 -0700281#ifdef CONFIG_NET_DMA
282 /* members for async copy */
283 struct dma_chan *dma_chan;
284 int wakeup;
285 struct dma_pinned_list *pinned_list;
286 dma_cookie_t dma_cookie;
287#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 } ucopy;
289
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200290 u32 snd_wl1; /* Sequence for window update */
291 u32 snd_wnd; /* The window we expect to receive */
292 u32 max_window; /* Maximal window ever seen from peer */
293 u32 mss_cache; /* Cached effective mss, not including SACKS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200295 u32 window_clamp; /* Maximal window to advertise */
296 u32 rcv_ssthresh; /* Current window clamp */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200298 u32 frto_highmark; /* snd_nxt when RTO occurred */
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700299 u16 advmss; /* Advertised MSS */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200300 u8 frto_counter; /* Number of new acks after RTO */
301 u8 nonagle; /* Disable Nagle algorithm? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303/* RTT measurement */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200304 u32 srtt; /* smoothed round trip time << 3 */
305 u32 mdev; /* medium deviation */
306 u32 mdev_max; /* maximal mdev for the last rtt period */
307 u32 rttvar; /* smoothed mdev_max */
308 u32 rtt_seq; /* sequence number to update rttvar */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200310 u32 packets_out; /* Packets which are "in flight" */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200311 u32 retrans_out; /* Retransmitted packets out */
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700312
313 u16 urg_data; /* Saved octet of OOB data and control flags */
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700314 u8 ecn_flags; /* ECN status bits. */
Ilpo Järvinen33f5f572008-10-07 14:43:06 -0700315 u8 reordering; /* Packet reordering metric. */
316 u32 snd_up; /* Urgent pointer */
317
318 u8 keepalive_probes; /* num of allowed keep alive probes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319/*
320 * Options received (usually on last packet, some only on SYN packets).
321 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 struct tcp_options_received rx_opt;
323
324/*
325 * Slow start and congestion control (see also Nagle, and Karn & Partridge)
326 */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200327 u32 snd_ssthresh; /* Slow start size threshold */
328 u32 snd_cwnd; /* Sending congestion window */
Ilpo Järvinenf78a1b32007-10-15 12:59:43 -0700329 u32 snd_cwnd_cnt; /* Linear increase counter */
David S. Millere0ef57c2007-02-22 22:52:59 -0800330 u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200331 u32 snd_cwnd_used;
332 u32 snd_cwnd_stamp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200334 u32 rcv_wnd; /* Current receiver window */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200335 u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
336 u32 pushed_seq; /* Last pushed seq, required to talk to windows */
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700337 u32 lost_out; /* Lost packets */
338 u32 sacked_out; /* SACK'd packets */
339 u32 fackets_out; /* FACK'd packets */
340 u32 tso_deferred;
341 u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700343 /* from STCP, retrans queue hinting */
344 struct sk_buff* lost_skb_hint;
345 struct sk_buff *scoreboard_skb_hint;
346 struct sk_buff *retransmit_skb_hint;
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700347
348 struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
349
350 /* SACKs data, these 2 need to be together (see tcp_build_and_update_options) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
352 struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
353
Ilpo Järvinenfd6dad62007-11-15 19:49:47 -0800354 struct tcp_sack_block recv_sack_cache[4];
Stephen Hemminger6a438bb2005-11-10 17:14:59 -0800355
Ilpo Järvinena47e5a92007-11-15 19:41:46 -0800356 struct sk_buff *highest_sack; /* highest skb with SACK received
357 * (validity guaranteed only if
358 * sacked_out > 0)
359 */
Ilpo Järvinend738cd82007-03-24 21:03:23 -0700360
Stephen Hemminger6a438bb2005-11-10 17:14:59 -0800361 int lost_cnt_hint;
Ilpo Järvinen006f5822008-09-20 21:20:20 -0700362 u32 retransmit_high; /* L-bits may be on up to this seqno */
Stephen Hemminger6a438bb2005-11-10 17:14:59 -0800363
Ilpo Järvinenb08d6cb2007-10-11 17:36:13 -0700364 u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */
365
Ilpo Järvinen4b7494402008-05-21 17:40:05 -0700366 u32 prior_ssthresh; /* ssthresh saved at recovery start */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200367 u32 high_seq; /* snd_nxt at onset of congestion */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200369 u32 retrans_stamp; /* Timestamp of the last retransmit,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 * also used in SYN-SENT to remember stamp of
371 * the first SYN. */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200372 u32 undo_marker; /* tracking retrans started here. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 int undo_retrans; /* number of undoable retransmissions. */
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200374 u32 total_retrans; /* Total retransmits for entire connection */
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700375
376 u32 urg_seq; /* Seq of received urgent pointer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 unsigned int keepalive_time; /* time before keep alive takes place */
378 unsigned int keepalive_intvl; /* time interval between keep alive probes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 unsigned long last_synq_overflow;
381
382/* Receiver side RTT estimation */
383 struct {
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200384 u32 rtt;
385 u32 seq;
386 u32 time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 } rcv_rtt_est;
388
389/* Receiver queue space */
390 struct {
391 int space;
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200392 u32 seq;
393 u32 time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 } rcvq_space;
John Heffner0e7b1362006-03-20 21:32:58 -0800395
396/* TCP-specific MTU probe information. */
397 struct {
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200398 u32 probe_seq_start;
399 u32 probe_seq_end;
John Heffner0e7b1362006-03-20 21:32:58 -0800400 } mtu_probe;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800401
402#ifdef CONFIG_TCP_MD5SIG
403/* TCP AF-Specific parts; only used by MD5 Signature support so far */
404 struct tcp_sock_af_ops *af_specific;
405
406/* TCP MD5 Signagure Option information */
407 struct tcp_md5sig_info *md5sig_info;
408#endif
Ilpo Järvinenb79eeeb2008-05-29 03:25:23 -0700409
410 int linger2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411};
412
413static inline struct tcp_sock *tcp_sk(const struct sock *sk)
414{
415 return (struct tcp_sock *)sk;
416}
417
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700418struct tcp_timewait_sock {
419 struct inet_timewait_sock tw_sk;
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200420 u32 tw_rcv_nxt;
421 u32 tw_snd_nxt;
422 u32 tw_rcv_wnd;
423 u32 tw_ts_recent;
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700424 long tw_ts_recent_stamp;
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800425#ifdef CONFIG_TCP_MD5SIG
Arnaldo Carvalho de Melo3a137d22006-11-28 01:12:38 -0200426 u16 tw_md5_keylen;
427 u8 tw_md5_key[TCP_MD5SIG_MAXKEYLEN];
YOSHIFUJI Hideakicfb6eeb2006-11-14 19:07:45 -0800428#endif
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700429};
430
431static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
432{
433 return (struct tcp_timewait_sock *)sk;
434}
435
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436#endif
437
438#endif /* _LINUX_TCP_H */