]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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> | |
cfb6eeb4 | 22 | #include <linux/socket.h> |
1da177e4 LT |
23 | |
24 | struct tcphdr { | |
46a97324 AV |
25 | __be16 source; |
26 | __be16 dest; | |
27 | __be32 seq; | |
28 | __be32 ack_seq; | |
1da177e4 LT |
29 | #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 | |
46a97324 | 54 | __be16 window; |
9981a0e3 | 55 | __sum16 check; |
46a97324 | 56 | __be16 urg_ptr; |
1da177e4 LT |
57 | }; |
58 | ||
1da177e4 LT |
59 | /* |
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 | */ | |
64 | union tcp_word_hdr { | |
65 | struct tcphdr hdr; | |
46a97324 | 66 | __be32 words[5]; |
1da177e4 LT |
67 | }; |
68 | ||
69 | #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) | |
70 | ||
71 | enum { | |
8876d6b5 PP |
72 | TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000), |
73 | TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000), | |
74 | TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000), | |
75 | TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000), | |
76 | TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000), | |
77 | TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000), | |
78 | TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000), | |
79 | TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000), | |
80 | TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000), | |
81 | TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000) | |
1da177e4 LT |
82 | }; |
83 | ||
bee7ca9e WAS |
84 | /* |
85 | * TCP general constants | |
86 | */ | |
87 | #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */ | |
88 | #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */ | |
89 | ||
1da177e4 LT |
90 | /* TCP socket options */ |
91 | #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */ | |
92 | #define TCP_MAXSEG 2 /* Limit MSS */ | |
93 | #define TCP_CORK 3 /* Never send partially complete segments */ | |
94 | #define TCP_KEEPIDLE 4 /* Start keeplives after this period */ | |
95 | #define TCP_KEEPINTVL 5 /* Interval between keepalives */ | |
96 | #define TCP_KEEPCNT 6 /* Number of keepalives before death */ | |
97 | #define TCP_SYNCNT 7 /* Number of SYN retransmits */ | |
98 | #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */ | |
99 | #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */ | |
100 | #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */ | |
101 | #define TCP_INFO 11 /* Information about this connection. */ | |
102 | #define TCP_QUICKACK 12 /* Block/reenable quick acks */ | |
5f8ef48d | 103 | #define TCP_CONGESTION 13 /* Congestion control algorithm */ |
cfb6eeb4 | 104 | #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ |
519855c5 | 105 | #define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */ |
36e31b0a | 106 | #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/ |
7e380175 | 107 | #define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */ |
dca43c75 | 108 | #define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */ |
ee995283 PE |
109 | #define TCP_REPAIR 19 /* TCP sock is under repair right now */ |
110 | #define TCP_REPAIR_QUEUE 20 | |
111 | #define TCP_QUEUE_SEQ 21 | |
b139ba4e | 112 | #define TCP_REPAIR_OPTIONS 22 |
ee995283 | 113 | |
de248a75 PE |
114 | struct tcp_repair_opt { |
115 | __u32 opt_code; | |
116 | __u32 opt_val; | |
117 | }; | |
118 | ||
ee995283 PE |
119 | enum { |
120 | TCP_NO_QUEUE, | |
121 | TCP_RECV_QUEUE, | |
122 | TCP_SEND_QUEUE, | |
123 | TCP_QUEUES_NR, | |
124 | }; | |
1da177e4 | 125 | |
519855c5 | 126 | /* for TCP_INFO socket option */ |
1da177e4 LT |
127 | #define TCPI_OPT_TIMESTAMPS 1 |
128 | #define TCPI_OPT_SACK 2 | |
129 | #define TCPI_OPT_WSCALE 4 | |
b5c5693b ED |
130 | #define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ |
131 | #define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ | |
1da177e4 | 132 | |
d94d9fee | 133 | enum tcp_ca_state { |
1da177e4 LT |
134 | TCP_CA_Open = 0, |
135 | #define TCPF_CA_Open (1<<TCP_CA_Open) | |
136 | TCP_CA_Disorder = 1, | |
137 | #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) | |
138 | TCP_CA_CWR = 2, | |
139 | #define TCPF_CA_CWR (1<<TCP_CA_CWR) | |
140 | TCP_CA_Recovery = 3, | |
141 | #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) | |
142 | TCP_CA_Loss = 4 | |
143 | #define TCPF_CA_Loss (1<<TCP_CA_Loss) | |
144 | }; | |
145 | ||
d94d9fee | 146 | struct tcp_info { |
1da177e4 LT |
147 | __u8 tcpi_state; |
148 | __u8 tcpi_ca_state; | |
149 | __u8 tcpi_retransmits; | |
150 | __u8 tcpi_probes; | |
151 | __u8 tcpi_backoff; | |
152 | __u8 tcpi_options; | |
153 | __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; | |
154 | ||
155 | __u32 tcpi_rto; | |
156 | __u32 tcpi_ato; | |
157 | __u32 tcpi_snd_mss; | |
158 | __u32 tcpi_rcv_mss; | |
159 | ||
160 | __u32 tcpi_unacked; | |
161 | __u32 tcpi_sacked; | |
162 | __u32 tcpi_lost; | |
163 | __u32 tcpi_retrans; | |
164 | __u32 tcpi_fackets; | |
165 | ||
166 | /* Times. */ | |
167 | __u32 tcpi_last_data_sent; | |
168 | __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ | |
169 | __u32 tcpi_last_data_recv; | |
170 | __u32 tcpi_last_ack_recv; | |
171 | ||
172 | /* Metrics. */ | |
173 | __u32 tcpi_pmtu; | |
174 | __u32 tcpi_rcv_ssthresh; | |
175 | __u32 tcpi_rtt; | |
176 | __u32 tcpi_rttvar; | |
177 | __u32 tcpi_snd_ssthresh; | |
178 | __u32 tcpi_snd_cwnd; | |
179 | __u32 tcpi_advmss; | |
180 | __u32 tcpi_reordering; | |
181 | ||
182 | __u32 tcpi_rcv_rtt; | |
183 | __u32 tcpi_rcv_space; | |
184 | ||
185 | __u32 tcpi_total_retrans; | |
186 | }; | |
187 | ||
cfb6eeb4 YH |
188 | /* for TCP_MD5SIG socket option */ |
189 | #define TCP_MD5SIG_MAXKEYLEN 80 | |
190 | ||
191 | struct tcp_md5sig { | |
192 | struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ | |
193 | __u16 __tcpm_pad1; /* zero */ | |
194 | __u16 tcpm_keylen; /* key length */ | |
195 | __u32 __tcpm_pad2; /* zero */ | |
196 | __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */ | |
197 | }; | |
198 | ||
519855c5 WAS |
199 | /* for TCP_COOKIE_TRANSACTIONS (TCPCT) socket option */ |
200 | #define TCP_COOKIE_MIN 8 /* 64-bits */ | |
201 | #define TCP_COOKIE_MAX 16 /* 128-bits */ | |
202 | #define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX) | |
203 | ||
204 | /* Flags for both getsockopt and setsockopt */ | |
205 | #define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */ | |
206 | #define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies, | |
207 | * supercedes everything. */ | |
208 | ||
209 | /* Flags for getsockopt */ | |
210 | #define TCP_S_DATA_IN (1 << 2) /* Was data received? */ | |
211 | #define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */ | |
212 | ||
213 | /* TCP_COOKIE_TRANSACTIONS data */ | |
214 | struct tcp_cookie_transactions { | |
215 | __u16 tcpct_flags; /* see above */ | |
216 | __u8 __tcpct_pad1; /* zero */ | |
217 | __u8 tcpct_cookie_desired; /* bytes */ | |
218 | __u16 tcpct_s_data_desired; /* bytes of variable data */ | |
219 | __u16 tcpct_used; /* bytes in value */ | |
220 | __u8 tcpct_value[TCP_MSS_DEFAULT]; | |
221 | }; | |
222 | ||
1da177e4 LT |
223 | #ifdef __KERNEL__ |
224 | ||
1da177e4 | 225 | #include <linux/skbuff.h> |
c8a553ad | 226 | #include <linux/dmaengine.h> |
1da177e4 | 227 | #include <net/sock.h> |
463c84b9 | 228 | #include <net/inet_connection_sock.h> |
8feaf0c0 | 229 | #include <net/inet_timewait_sock.h> |
1da177e4 | 230 | |
aa8223c7 ACM |
231 | static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb) |
232 | { | |
9c70220b | 233 | return (struct tcphdr *)skb_transport_header(skb); |
aa8223c7 ACM |
234 | } |
235 | ||
ab6a5bb6 ACM |
236 | static inline unsigned int tcp_hdrlen(const struct sk_buff *skb) |
237 | { | |
aa8223c7 | 238 | return tcp_hdr(skb)->doff * 4; |
ab6a5bb6 ACM |
239 | } |
240 | ||
241 | static inline unsigned int tcp_optlen(const struct sk_buff *skb) | |
242 | { | |
aa8223c7 | 243 | return (tcp_hdr(skb)->doff - 5) * 4; |
ab6a5bb6 ACM |
244 | } |
245 | ||
1da177e4 | 246 | /* This defines a selective acknowledgement block. */ |
269bd27e AV |
247 | struct tcp_sack_block_wire { |
248 | __be32 start_seq; | |
249 | __be32 end_seq; | |
250 | }; | |
251 | ||
1da177e4 | 252 | struct tcp_sack_block { |
3a137d20 ACM |
253 | u32 start_seq; |
254 | u32 end_seq; | |
1da177e4 LT |
255 | }; |
256 | ||
ab56222a VS |
257 | /*These are used to set the sack_ok field in struct tcp_options_received */ |
258 | #define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */ | |
259 | #define TCP_FACK_ENABLED (1 << 1) /*1 = FACK is enabled locally*/ | |
260 | #define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/ | |
261 | ||
1da177e4 LT |
262 | struct tcp_options_received { |
263 | /* PAWS/RTTM data */ | |
264 | long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ | |
3a137d20 ACM |
265 | u32 ts_recent; /* Time stamp to echo next */ |
266 | u32 rcv_tsval; /* Time stamp value */ | |
267 | u32 rcv_tsecr; /* Time stamp echo reply */ | |
268 | u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ | |
1da177e4 LT |
269 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ |
270 | dsack : 1, /* D-SACK is scheduled */ | |
271 | wscale_ok : 1, /* Wscale seen on SYN packet */ | |
272 | sack_ok : 4, /* SACK seen on SYN packet */ | |
273 | snd_wscale : 4, /* Window scaling received from sender */ | |
274 | rcv_wscale : 4; /* Window scaling to send to receiver */ | |
435cf559 WAS |
275 | u8 cookie_plus:6, /* bytes in authenticator/cookie option */ |
276 | cookie_out_never:1, | |
277 | cookie_in_always:1; | |
3a137d20 | 278 | u8 num_sacks; /* Number of SACK blocks */ |
435cf559 | 279 | u16 user_mss; /* mss requested by user in ioctl */ |
3a137d20 | 280 | u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ |
1da177e4 LT |
281 | }; |
282 | ||
519855c5 WAS |
283 | static inline void tcp_clear_options(struct tcp_options_received *rx_opt) |
284 | { | |
435cf559 WAS |
285 | rx_opt->tstamp_ok = rx_opt->sack_ok = 0; |
286 | rx_opt->wscale_ok = rx_opt->snd_wscale = 0; | |
287 | rx_opt->cookie_plus = 0; | |
519855c5 WAS |
288 | } |
289 | ||
4389dded | 290 | /* This is the max number of SACKS that we'll generate and process. It's safe |
435cf559 | 291 | * to increase this, although since: |
4389dded AL |
292 | * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8) |
293 | * only four options will fit in a standard TCP header */ | |
294 | #define TCP_NUM_SACKS 4 | |
295 | ||
435cf559 WAS |
296 | struct tcp_cookie_values; |
297 | struct tcp_request_sock_ops; | |
298 | ||
2e6599cb | 299 | struct tcp_request_sock { |
cfb6eeb4 YH |
300 | struct inet_request_sock req; |
301 | #ifdef CONFIG_TCP_MD5SIG | |
302 | /* Only used by TCP MD5 Signature so far. */ | |
b2e4b3de | 303 | const struct tcp_request_sock_ops *af_specific; |
cfb6eeb4 | 304 | #endif |
435cf559 WAS |
305 | u32 rcv_isn; |
306 | u32 snt_isn; | |
9ad7c049 | 307 | u32 snt_synack; /* synack sent time */ |
2e6599cb ACM |
308 | }; |
309 | ||
60236fdd | 310 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
2e6599cb ACM |
311 | { |
312 | return (struct tcp_request_sock *)req; | |
313 | } | |
314 | ||
1da177e4 | 315 | struct tcp_sock { |
463c84b9 ACM |
316 | /* inet_connection_sock has to be the first member of tcp_sock */ |
317 | struct inet_connection_sock inet_conn; | |
2ff52f28 | 318 | u16 tcp_header_len; /* Bytes of tcp header to send */ |
2a3a041c | 319 | u16 xmit_size_goal_segs; /* Goal for segmenting output packets */ |
1da177e4 LT |
320 | |
321 | /* | |
322 | * Header prediction flags | |
323 | * 0x5?10 << 16 + snd_wnd in net byte order | |
324 | */ | |
dddc93c0 | 325 | __be32 pred_flags; |
1da177e4 LT |
326 | |
327 | /* | |
328 | * RFC793 variables by their proper names. This means you can | |
329 | * read the code and the spec side by side (and laugh ...) | |
330 | * See RFC793 and RFC1122. The RFC writes these in capitals. | |
331 | */ | |
3a137d20 | 332 | u32 rcv_nxt; /* What we want to receive next */ |
54287cc1 ED |
333 | u32 copied_seq; /* Head of yet unread data */ |
334 | u32 rcv_wup; /* rcv_nxt on last window update sent */ | |
3a137d20 | 335 | u32 snd_nxt; /* Next sequence we send */ |
1da177e4 | 336 | |
3a137d20 ACM |
337 | u32 snd_una; /* First byte we want an ack for */ |
338 | u32 snd_sml; /* Last byte of the most recently transmitted small packet */ | |
339 | u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ | |
340 | u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ | |
1da177e4 LT |
341 | |
342 | /* Data for direct copy to user */ | |
343 | struct { | |
344 | struct sk_buff_head prequeue; | |
345 | struct task_struct *task; | |
346 | struct iovec *iov; | |
347 | int memory; | |
348 | int len; | |
97fc2f08 CL |
349 | #ifdef CONFIG_NET_DMA |
350 | /* members for async copy */ | |
351 | struct dma_chan *dma_chan; | |
352 | int wakeup; | |
353 | struct dma_pinned_list *pinned_list; | |
354 | dma_cookie_t dma_cookie; | |
355 | #endif | |
1da177e4 LT |
356 | } ucopy; |
357 | ||
3a137d20 ACM |
358 | u32 snd_wl1; /* Sequence for window update */ |
359 | u32 snd_wnd; /* The window we expect to receive */ | |
360 | u32 max_window; /* Maximal window ever seen from peer */ | |
361 | u32 mss_cache; /* Cached effective mss, not including SACKS */ | |
1da177e4 | 362 | |
3a137d20 ACM |
363 | u32 window_clamp; /* Maximal window to advertise */ |
364 | u32 rcv_ssthresh; /* Current window clamp */ | |
1da177e4 | 365 | |
3a137d20 | 366 | u32 frto_highmark; /* snd_nxt when RTO occurred */ |
b79eeeb9 | 367 | u16 advmss; /* Advertised MSS */ |
3a137d20 | 368 | u8 frto_counter; /* Number of new acks after RTO */ |
36e31b0a AP |
369 | u8 nonagle : 4,/* Disable Nagle algorithm? */ |
370 | thin_lto : 1,/* Use linear timeouts for thin streams */ | |
7e380175 | 371 | thin_dupack : 1,/* Fast retransmit on first dupack */ |
ee995283 PE |
372 | repair : 1, |
373 | unused : 1; | |
374 | u8 repair_queue; | |
750ea2ba YC |
375 | u8 do_early_retrans:1,/* Enable RFC5827 early-retransmit */ |
376 | early_retrans_delayed:1; /* Delayed ER timer installed */ | |
1da177e4 LT |
377 | |
378 | /* RTT measurement */ | |
3a137d20 ACM |
379 | u32 srtt; /* smoothed round trip time << 3 */ |
380 | u32 mdev; /* medium deviation */ | |
381 | u32 mdev_max; /* maximal mdev for the last rtt period */ | |
382 | u32 rttvar; /* smoothed mdev_max */ | |
383 | u32 rtt_seq; /* sequence number to update rttvar */ | |
384 | ||
385 | u32 packets_out; /* Packets which are "in flight" */ | |
3a137d20 | 386 | u32 retrans_out; /* Retransmitted packets out */ |
b79eeeb9 IJ |
387 | |
388 | u16 urg_data; /* Saved octet of OOB data and control flags */ | |
b79eeeb9 | 389 | u8 ecn_flags; /* ECN status bits. */ |
33f5f57e IJ |
390 | u8 reordering; /* Packet reordering metric. */ |
391 | u32 snd_up; /* Urgent pointer */ | |
392 | ||
393 | u8 keepalive_probes; /* num of allowed keep alive probes */ | |
1da177e4 LT |
394 | /* |
395 | * Options received (usually on last packet, some only on SYN packets). | |
396 | */ | |
1da177e4 LT |
397 | struct tcp_options_received rx_opt; |
398 | ||
399 | /* | |
400 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) | |
401 | */ | |
3a137d20 ACM |
402 | u32 snd_ssthresh; /* Slow start size threshold */ |
403 | u32 snd_cwnd; /* Sending congestion window */ | |
f78a1b38 | 404 | u32 snd_cwnd_cnt; /* Linear increase counter */ |
e0ef57cc | 405 | u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ |
3a137d20 ACM |
406 | u32 snd_cwnd_used; |
407 | u32 snd_cwnd_stamp; | |
a262f0cd ND |
408 | u32 prior_cwnd; /* Congestion window at start of Recovery. */ |
409 | u32 prr_delivered; /* Number of newly delivered packets to | |
410 | * receiver in Recovery. */ | |
411 | u32 prr_out; /* Total number of pkts sent during Recovery. */ | |
1da177e4 | 412 | |
3a137d20 | 413 | u32 rcv_wnd; /* Current receiver window */ |
3a137d20 ACM |
414 | u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |
415 | u32 pushed_seq; /* Last pushed seq, required to talk to windows */ | |
b79eeeb9 IJ |
416 | u32 lost_out; /* Lost packets */ |
417 | u32 sacked_out; /* SACK'd packets */ | |
418 | u32 fackets_out; /* FACK'd packets */ | |
419 | u32 tso_deferred; | |
420 | u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */ | |
1da177e4 | 421 | |
b79eeeb9 IJ |
422 | /* from STCP, retrans queue hinting */ |
423 | struct sk_buff* lost_skb_hint; | |
424 | struct sk_buff *scoreboard_skb_hint; | |
425 | struct sk_buff *retransmit_skb_hint; | |
b79eeeb9 IJ |
426 | |
427 | struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ | |
428 | ||
c0a788c4 | 429 | /* SACKs data, these 2 need to be together (see tcp_options_write) */ |
1da177e4 LT |
430 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ |
431 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ | |
432 | ||
fd6dad61 | 433 | struct tcp_sack_block recv_sack_cache[4]; |
6a438bbe | 434 | |
ecb97192 NC |
435 | struct sk_buff *highest_sack; /* skb just after the highest |
436 | * skb with SACKed bit set | |
a47e5a98 IJ |
437 | * (validity guaranteed only if |
438 | * sacked_out > 0) | |
439 | */ | |
d738cd8f | 440 | |
6a438bbe | 441 | int lost_cnt_hint; |
006f582c | 442 | u32 retransmit_high; /* L-bits may be on up to this seqno */ |
6a438bbe | 443 | |
b08d6cb2 IJ |
444 | u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */ |
445 | ||
4b749440 | 446 | u32 prior_ssthresh; /* ssthresh saved at recovery start */ |
3a137d20 | 447 | u32 high_seq; /* snd_nxt at onset of congestion */ |
1da177e4 | 448 | |
3a137d20 | 449 | u32 retrans_stamp; /* Timestamp of the last retransmit, |
1da177e4 LT |
450 | * also used in SYN-SENT to remember stamp of |
451 | * the first SYN. */ | |
3a137d20 | 452 | u32 undo_marker; /* tracking retrans started here. */ |
1da177e4 | 453 | int undo_retrans; /* number of undoable retransmissions. */ |
b79eeeb9 IJ |
454 | u32 total_retrans; /* Total retransmits for entire connection */ |
455 | ||
3a137d20 | 456 | u32 urg_seq; /* Seq of received urgent pointer */ |
1da177e4 LT |
457 | unsigned int keepalive_time; /* time before keep alive takes place */ |
458 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ | |
1da177e4 | 459 | |
a0f82f64 | 460 | int linger2; |
1da177e4 LT |
461 | |
462 | /* Receiver side RTT estimation */ | |
463 | struct { | |
3a137d20 ACM |
464 | u32 rtt; |
465 | u32 seq; | |
466 | u32 time; | |
1da177e4 LT |
467 | } rcv_rtt_est; |
468 | ||
469 | /* Receiver queue space */ | |
470 | struct { | |
471 | int space; | |
3a137d20 ACM |
472 | u32 seq; |
473 | u32 time; | |
1da177e4 | 474 | } rcvq_space; |
0e7b1368 JH |
475 | |
476 | /* TCP-specific MTU probe information. */ | |
477 | struct { | |
3a137d20 ACM |
478 | u32 probe_seq_start; |
479 | u32 probe_seq_end; | |
0e7b1368 | 480 | } mtu_probe; |
cfb6eeb4 YH |
481 | |
482 | #ifdef CONFIG_TCP_MD5SIG | |
483 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ | |
b2e4b3de | 484 | const struct tcp_sock_af_ops *af_specific; |
cfb6eeb4 | 485 | |
b2e4b3de | 486 | /* TCP MD5 Signature Option information */ |
a8afca03 | 487 | struct tcp_md5sig_info __rcu *md5sig_info; |
cfb6eeb4 | 488 | #endif |
435cf559 WAS |
489 | |
490 | /* When the cookie options are generated and exchanged, then this | |
491 | * object holds a reference to them (cookie_values->kref). Also | |
492 | * contains related tcp_cookie_transactions fields. | |
493 | */ | |
494 | struct tcp_cookie_values *cookie_values; | |
1da177e4 LT |
495 | }; |
496 | ||
497 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) | |
498 | { | |
499 | return (struct tcp_sock *)sk; | |
500 | } | |
501 | ||
8feaf0c0 ACM |
502 | struct tcp_timewait_sock { |
503 | struct inet_timewait_sock tw_sk; | |
3a137d20 ACM |
504 | u32 tw_rcv_nxt; |
505 | u32 tw_snd_nxt; | |
506 | u32 tw_rcv_wnd; | |
507 | u32 tw_ts_recent; | |
8feaf0c0 | 508 | long tw_ts_recent_stamp; |
cfb6eeb4 | 509 | #ifdef CONFIG_TCP_MD5SIG |
a915da9b | 510 | struct tcp_md5sig_key *tw_md5_key; |
cfb6eeb4 | 511 | #endif |
435cf559 WAS |
512 | /* Few sockets in timewait have cookies; in that case, then this |
513 | * object holds a reference to them (tw_cookie_values->kref). | |
514 | */ | |
515 | struct tcp_cookie_values *tw_cookie_values; | |
8feaf0c0 ACM |
516 | }; |
517 | ||
518 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) | |
519 | { | |
520 | return (struct tcp_timewait_sock *)sk; | |
521 | } | |
522 | ||
519855c5 | 523 | #endif /* __KERNEL__ */ |
1da177e4 LT |
524 | |
525 | #endif /* _LINUX_TCP_H */ |