Commit | Line | Data |
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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 |
10467163 | 113 | #define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */ |
ee995283 | 114 | |
de248a75 PE |
115 | struct tcp_repair_opt { |
116 | __u32 opt_code; | |
117 | __u32 opt_val; | |
118 | }; | |
119 | ||
ee995283 PE |
120 | enum { |
121 | TCP_NO_QUEUE, | |
122 | TCP_RECV_QUEUE, | |
123 | TCP_SEND_QUEUE, | |
124 | TCP_QUEUES_NR, | |
125 | }; | |
1da177e4 | 126 | |
519855c5 | 127 | /* for TCP_INFO socket option */ |
1da177e4 LT |
128 | #define TCPI_OPT_TIMESTAMPS 1 |
129 | #define TCPI_OPT_SACK 2 | |
130 | #define TCPI_OPT_WSCALE 4 | |
b5c5693b ED |
131 | #define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ |
132 | #define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ | |
1da177e4 | 133 | |
d94d9fee | 134 | enum tcp_ca_state { |
1da177e4 LT |
135 | TCP_CA_Open = 0, |
136 | #define TCPF_CA_Open (1<<TCP_CA_Open) | |
137 | TCP_CA_Disorder = 1, | |
138 | #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) | |
139 | TCP_CA_CWR = 2, | |
140 | #define TCPF_CA_CWR (1<<TCP_CA_CWR) | |
141 | TCP_CA_Recovery = 3, | |
142 | #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) | |
143 | TCP_CA_Loss = 4 | |
144 | #define TCPF_CA_Loss (1<<TCP_CA_Loss) | |
145 | }; | |
146 | ||
d94d9fee | 147 | struct tcp_info { |
1da177e4 LT |
148 | __u8 tcpi_state; |
149 | __u8 tcpi_ca_state; | |
150 | __u8 tcpi_retransmits; | |
151 | __u8 tcpi_probes; | |
152 | __u8 tcpi_backoff; | |
153 | __u8 tcpi_options; | |
154 | __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; | |
155 | ||
156 | __u32 tcpi_rto; | |
157 | __u32 tcpi_ato; | |
158 | __u32 tcpi_snd_mss; | |
159 | __u32 tcpi_rcv_mss; | |
160 | ||
161 | __u32 tcpi_unacked; | |
162 | __u32 tcpi_sacked; | |
163 | __u32 tcpi_lost; | |
164 | __u32 tcpi_retrans; | |
165 | __u32 tcpi_fackets; | |
166 | ||
167 | /* Times. */ | |
168 | __u32 tcpi_last_data_sent; | |
169 | __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ | |
170 | __u32 tcpi_last_data_recv; | |
171 | __u32 tcpi_last_ack_recv; | |
172 | ||
173 | /* Metrics. */ | |
174 | __u32 tcpi_pmtu; | |
175 | __u32 tcpi_rcv_ssthresh; | |
176 | __u32 tcpi_rtt; | |
177 | __u32 tcpi_rttvar; | |
178 | __u32 tcpi_snd_ssthresh; | |
179 | __u32 tcpi_snd_cwnd; | |
180 | __u32 tcpi_advmss; | |
181 | __u32 tcpi_reordering; | |
182 | ||
183 | __u32 tcpi_rcv_rtt; | |
184 | __u32 tcpi_rcv_space; | |
185 | ||
186 | __u32 tcpi_total_retrans; | |
187 | }; | |
188 | ||
cfb6eeb4 YH |
189 | /* for TCP_MD5SIG socket option */ |
190 | #define TCP_MD5SIG_MAXKEYLEN 80 | |
191 | ||
192 | struct tcp_md5sig { | |
193 | struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ | |
194 | __u16 __tcpm_pad1; /* zero */ | |
195 | __u16 tcpm_keylen; /* key length */ | |
196 | __u32 __tcpm_pad2; /* zero */ | |
197 | __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */ | |
198 | }; | |
199 | ||
519855c5 WAS |
200 | /* for TCP_COOKIE_TRANSACTIONS (TCPCT) socket option */ |
201 | #define TCP_COOKIE_MIN 8 /* 64-bits */ | |
202 | #define TCP_COOKIE_MAX 16 /* 128-bits */ | |
203 | #define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX) | |
204 | ||
205 | /* Flags for both getsockopt and setsockopt */ | |
206 | #define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */ | |
207 | #define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies, | |
208 | * supercedes everything. */ | |
209 | ||
210 | /* Flags for getsockopt */ | |
211 | #define TCP_S_DATA_IN (1 << 2) /* Was data received? */ | |
212 | #define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */ | |
213 | ||
214 | /* TCP_COOKIE_TRANSACTIONS data */ | |
215 | struct tcp_cookie_transactions { | |
216 | __u16 tcpct_flags; /* see above */ | |
217 | __u8 __tcpct_pad1; /* zero */ | |
218 | __u8 tcpct_cookie_desired; /* bytes */ | |
219 | __u16 tcpct_s_data_desired; /* bytes of variable data */ | |
220 | __u16 tcpct_used; /* bytes in value */ | |
221 | __u8 tcpct_value[TCP_MSS_DEFAULT]; | |
222 | }; | |
223 | ||
1da177e4 LT |
224 | #ifdef __KERNEL__ |
225 | ||
1da177e4 | 226 | #include <linux/skbuff.h> |
c8a553ad | 227 | #include <linux/dmaengine.h> |
1da177e4 | 228 | #include <net/sock.h> |
463c84b9 | 229 | #include <net/inet_connection_sock.h> |
8feaf0c0 | 230 | #include <net/inet_timewait_sock.h> |
1da177e4 | 231 | |
aa8223c7 ACM |
232 | static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb) |
233 | { | |
9c70220b | 234 | return (struct tcphdr *)skb_transport_header(skb); |
aa8223c7 ACM |
235 | } |
236 | ||
ab6a5bb6 ACM |
237 | static inline unsigned int tcp_hdrlen(const struct sk_buff *skb) |
238 | { | |
aa8223c7 | 239 | return tcp_hdr(skb)->doff * 4; |
ab6a5bb6 ACM |
240 | } |
241 | ||
242 | static inline unsigned int tcp_optlen(const struct sk_buff *skb) | |
243 | { | |
aa8223c7 | 244 | return (tcp_hdr(skb)->doff - 5) * 4; |
ab6a5bb6 ACM |
245 | } |
246 | ||
2100c8d2 YC |
247 | /* TCP Fast Open */ |
248 | #define TCP_FASTOPEN_COOKIE_MIN 4 /* Min Fast Open Cookie size in bytes */ | |
249 | #define TCP_FASTOPEN_COOKIE_MAX 16 /* Max Fast Open Cookie size in bytes */ | |
10467163 | 250 | #define TCP_FASTOPEN_COOKIE_SIZE 8 /* the size employed by this impl. */ |
2100c8d2 YC |
251 | |
252 | /* TCP Fast Open Cookie as stored in memory */ | |
253 | struct tcp_fastopen_cookie { | |
254 | s8 len; | |
255 | u8 val[TCP_FASTOPEN_COOKIE_MAX]; | |
256 | }; | |
257 | ||
1da177e4 | 258 | /* This defines a selective acknowledgement block. */ |
269bd27e AV |
259 | struct tcp_sack_block_wire { |
260 | __be32 start_seq; | |
261 | __be32 end_seq; | |
262 | }; | |
263 | ||
1da177e4 | 264 | struct tcp_sack_block { |
3a137d20 ACM |
265 | u32 start_seq; |
266 | u32 end_seq; | |
1da177e4 LT |
267 | }; |
268 | ||
ab56222a VS |
269 | /*These are used to set the sack_ok field in struct tcp_options_received */ |
270 | #define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */ | |
271 | #define TCP_FACK_ENABLED (1 << 1) /*1 = FACK is enabled locally*/ | |
272 | #define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/ | |
273 | ||
1da177e4 LT |
274 | struct tcp_options_received { |
275 | /* PAWS/RTTM data */ | |
276 | long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ | |
3a137d20 ACM |
277 | u32 ts_recent; /* Time stamp to echo next */ |
278 | u32 rcv_tsval; /* Time stamp value */ | |
279 | u32 rcv_tsecr; /* Time stamp echo reply */ | |
280 | u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ | |
1da177e4 LT |
281 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ |
282 | dsack : 1, /* D-SACK is scheduled */ | |
283 | wscale_ok : 1, /* Wscale seen on SYN packet */ | |
284 | sack_ok : 4, /* SACK seen on SYN packet */ | |
285 | snd_wscale : 4, /* Window scaling received from sender */ | |
286 | rcv_wscale : 4; /* Window scaling to send to receiver */ | |
435cf559 WAS |
287 | u8 cookie_plus:6, /* bytes in authenticator/cookie option */ |
288 | cookie_out_never:1, | |
289 | cookie_in_always:1; | |
3a137d20 | 290 | u8 num_sacks; /* Number of SACK blocks */ |
435cf559 | 291 | u16 user_mss; /* mss requested by user in ioctl */ |
3a137d20 | 292 | u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ |
1da177e4 LT |
293 | }; |
294 | ||
519855c5 WAS |
295 | static inline void tcp_clear_options(struct tcp_options_received *rx_opt) |
296 | { | |
435cf559 WAS |
297 | rx_opt->tstamp_ok = rx_opt->sack_ok = 0; |
298 | rx_opt->wscale_ok = rx_opt->snd_wscale = 0; | |
299 | rx_opt->cookie_plus = 0; | |
519855c5 WAS |
300 | } |
301 | ||
4389dded | 302 | /* This is the max number of SACKS that we'll generate and process. It's safe |
435cf559 | 303 | * to increase this, although since: |
4389dded AL |
304 | * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8) |
305 | * only four options will fit in a standard TCP header */ | |
306 | #define TCP_NUM_SACKS 4 | |
307 | ||
435cf559 WAS |
308 | struct tcp_cookie_values; |
309 | struct tcp_request_sock_ops; | |
310 | ||
2e6599cb | 311 | struct tcp_request_sock { |
cfb6eeb4 YH |
312 | struct inet_request_sock req; |
313 | #ifdef CONFIG_TCP_MD5SIG | |
314 | /* Only used by TCP MD5 Signature so far. */ | |
b2e4b3de | 315 | const struct tcp_request_sock_ops *af_specific; |
cfb6eeb4 | 316 | #endif |
10467163 | 317 | struct sock *listener; /* needed for TFO */ |
435cf559 WAS |
318 | u32 rcv_isn; |
319 | u32 snt_isn; | |
9ad7c049 | 320 | u32 snt_synack; /* synack sent time */ |
10467163 JC |
321 | u32 rcv_nxt; /* the ack # by SYNACK. For |
322 | * FastOpen it's the seq# | |
323 | * after data-in-SYN. | |
324 | */ | |
2e6599cb ACM |
325 | }; |
326 | ||
60236fdd | 327 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
2e6599cb ACM |
328 | { |
329 | return (struct tcp_request_sock *)req; | |
330 | } | |
331 | ||
1da177e4 | 332 | struct tcp_sock { |
463c84b9 ACM |
333 | /* inet_connection_sock has to be the first member of tcp_sock */ |
334 | struct inet_connection_sock inet_conn; | |
2ff52f28 | 335 | u16 tcp_header_len; /* Bytes of tcp header to send */ |
2a3a041c | 336 | u16 xmit_size_goal_segs; /* Goal for segmenting output packets */ |
1da177e4 LT |
337 | |
338 | /* | |
339 | * Header prediction flags | |
340 | * 0x5?10 << 16 + snd_wnd in net byte order | |
341 | */ | |
dddc93c0 | 342 | __be32 pred_flags; |
1da177e4 LT |
343 | |
344 | /* | |
345 | * RFC793 variables by their proper names. This means you can | |
346 | * read the code and the spec side by side (and laugh ...) | |
347 | * See RFC793 and RFC1122. The RFC writes these in capitals. | |
348 | */ | |
3a137d20 | 349 | u32 rcv_nxt; /* What we want to receive next */ |
54287cc1 ED |
350 | u32 copied_seq; /* Head of yet unread data */ |
351 | u32 rcv_wup; /* rcv_nxt on last window update sent */ | |
3a137d20 | 352 | u32 snd_nxt; /* Next sequence we send */ |
1da177e4 | 353 | |
3a137d20 ACM |
354 | u32 snd_una; /* First byte we want an ack for */ |
355 | u32 snd_sml; /* Last byte of the most recently transmitted small packet */ | |
356 | u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ | |
357 | u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ | |
1da177e4 | 358 | |
46d3ceab ED |
359 | struct list_head tsq_node; /* anchor in tsq_tasklet.head list */ |
360 | unsigned long tsq_flags; | |
361 | ||
1da177e4 LT |
362 | /* Data for direct copy to user */ |
363 | struct { | |
364 | struct sk_buff_head prequeue; | |
365 | struct task_struct *task; | |
366 | struct iovec *iov; | |
367 | int memory; | |
368 | int len; | |
97fc2f08 CL |
369 | #ifdef CONFIG_NET_DMA |
370 | /* members for async copy */ | |
371 | struct dma_chan *dma_chan; | |
372 | int wakeup; | |
373 | struct dma_pinned_list *pinned_list; | |
374 | dma_cookie_t dma_cookie; | |
375 | #endif | |
1da177e4 LT |
376 | } ucopy; |
377 | ||
3a137d20 ACM |
378 | u32 snd_wl1; /* Sequence for window update */ |
379 | u32 snd_wnd; /* The window we expect to receive */ | |
380 | u32 max_window; /* Maximal window ever seen from peer */ | |
381 | u32 mss_cache; /* Cached effective mss, not including SACKS */ | |
1da177e4 | 382 | |
3a137d20 ACM |
383 | u32 window_clamp; /* Maximal window to advertise */ |
384 | u32 rcv_ssthresh; /* Current window clamp */ | |
1da177e4 | 385 | |
3a137d20 | 386 | u32 frto_highmark; /* snd_nxt when RTO occurred */ |
b79eeeb9 | 387 | u16 advmss; /* Advertised MSS */ |
3a137d20 | 388 | u8 frto_counter; /* Number of new acks after RTO */ |
36e31b0a AP |
389 | u8 nonagle : 4,/* Disable Nagle algorithm? */ |
390 | thin_lto : 1,/* Use linear timeouts for thin streams */ | |
7e380175 | 391 | thin_dupack : 1,/* Fast retransmit on first dupack */ |
ee995283 PE |
392 | repair : 1, |
393 | unused : 1; | |
394 | u8 repair_queue; | |
750ea2ba | 395 | u8 do_early_retrans:1,/* Enable RFC5827 early-retransmit */ |
783237e8 | 396 | early_retrans_delayed:1, /* Delayed ER timer installed */ |
67da22d2 | 397 | syn_data:1, /* SYN includes data */ |
783237e8 | 398 | syn_fastopen:1; /* SYN includes Fast Open option */ |
1da177e4 LT |
399 | |
400 | /* RTT measurement */ | |
3a137d20 ACM |
401 | u32 srtt; /* smoothed round trip time << 3 */ |
402 | u32 mdev; /* medium deviation */ | |
403 | u32 mdev_max; /* maximal mdev for the last rtt period */ | |
404 | u32 rttvar; /* smoothed mdev_max */ | |
405 | u32 rtt_seq; /* sequence number to update rttvar */ | |
406 | ||
407 | u32 packets_out; /* Packets which are "in flight" */ | |
3a137d20 | 408 | u32 retrans_out; /* Retransmitted packets out */ |
b79eeeb9 IJ |
409 | |
410 | u16 urg_data; /* Saved octet of OOB data and control flags */ | |
b79eeeb9 | 411 | u8 ecn_flags; /* ECN status bits. */ |
33f5f57e IJ |
412 | u8 reordering; /* Packet reordering metric. */ |
413 | u32 snd_up; /* Urgent pointer */ | |
414 | ||
415 | u8 keepalive_probes; /* num of allowed keep alive probes */ | |
1da177e4 LT |
416 | /* |
417 | * Options received (usually on last packet, some only on SYN packets). | |
418 | */ | |
1da177e4 LT |
419 | struct tcp_options_received rx_opt; |
420 | ||
421 | /* | |
422 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) | |
423 | */ | |
3a137d20 ACM |
424 | u32 snd_ssthresh; /* Slow start size threshold */ |
425 | u32 snd_cwnd; /* Sending congestion window */ | |
f78a1b38 | 426 | u32 snd_cwnd_cnt; /* Linear increase counter */ |
e0ef57cc | 427 | u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ |
3a137d20 ACM |
428 | u32 snd_cwnd_used; |
429 | u32 snd_cwnd_stamp; | |
a262f0cd ND |
430 | u32 prior_cwnd; /* Congestion window at start of Recovery. */ |
431 | u32 prr_delivered; /* Number of newly delivered packets to | |
432 | * receiver in Recovery. */ | |
433 | u32 prr_out; /* Total number of pkts sent during Recovery. */ | |
1da177e4 | 434 | |
3a137d20 | 435 | u32 rcv_wnd; /* Current receiver window */ |
3a137d20 ACM |
436 | u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |
437 | u32 pushed_seq; /* Last pushed seq, required to talk to windows */ | |
b79eeeb9 IJ |
438 | u32 lost_out; /* Lost packets */ |
439 | u32 sacked_out; /* SACK'd packets */ | |
440 | u32 fackets_out; /* FACK'd packets */ | |
441 | u32 tso_deferred; | |
442 | u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */ | |
1da177e4 | 443 | |
b79eeeb9 IJ |
444 | /* from STCP, retrans queue hinting */ |
445 | struct sk_buff* lost_skb_hint; | |
446 | struct sk_buff *scoreboard_skb_hint; | |
447 | struct sk_buff *retransmit_skb_hint; | |
b79eeeb9 IJ |
448 | |
449 | struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ | |
450 | ||
c0a788c4 | 451 | /* SACKs data, these 2 need to be together (see tcp_options_write) */ |
1da177e4 LT |
452 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ |
453 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ | |
454 | ||
fd6dad61 | 455 | struct tcp_sack_block recv_sack_cache[4]; |
6a438bbe | 456 | |
ecb97192 NC |
457 | struct sk_buff *highest_sack; /* skb just after the highest |
458 | * skb with SACKed bit set | |
a47e5a98 IJ |
459 | * (validity guaranteed only if |
460 | * sacked_out > 0) | |
461 | */ | |
d738cd8f | 462 | |
6a438bbe | 463 | int lost_cnt_hint; |
006f582c | 464 | u32 retransmit_high; /* L-bits may be on up to this seqno */ |
6a438bbe | 465 | |
b08d6cb2 IJ |
466 | u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */ |
467 | ||
4b749440 | 468 | u32 prior_ssthresh; /* ssthresh saved at recovery start */ |
3a137d20 | 469 | u32 high_seq; /* snd_nxt at onset of congestion */ |
1da177e4 | 470 | |
3a137d20 | 471 | u32 retrans_stamp; /* Timestamp of the last retransmit, |
1da177e4 LT |
472 | * also used in SYN-SENT to remember stamp of |
473 | * the first SYN. */ | |
3a137d20 | 474 | u32 undo_marker; /* tracking retrans started here. */ |
1da177e4 | 475 | int undo_retrans; /* number of undoable retransmissions. */ |
b79eeeb9 IJ |
476 | u32 total_retrans; /* Total retransmits for entire connection */ |
477 | ||
3a137d20 | 478 | u32 urg_seq; /* Seq of received urgent pointer */ |
1da177e4 LT |
479 | unsigned int keepalive_time; /* time before keep alive takes place */ |
480 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ | |
1da177e4 | 481 | |
a0f82f64 | 482 | int linger2; |
1da177e4 LT |
483 | |
484 | /* Receiver side RTT estimation */ | |
485 | struct { | |
3a137d20 ACM |
486 | u32 rtt; |
487 | u32 seq; | |
488 | u32 time; | |
1da177e4 LT |
489 | } rcv_rtt_est; |
490 | ||
491 | /* Receiver queue space */ | |
492 | struct { | |
493 | int space; | |
3a137d20 ACM |
494 | u32 seq; |
495 | u32 time; | |
1da177e4 | 496 | } rcvq_space; |
0e7b1368 JH |
497 | |
498 | /* TCP-specific MTU probe information. */ | |
499 | struct { | |
3a137d20 ACM |
500 | u32 probe_seq_start; |
501 | u32 probe_seq_end; | |
0e7b1368 | 502 | } mtu_probe; |
563d34d0 ED |
503 | u32 mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG |
504 | * while socket was owned by user. | |
505 | */ | |
cfb6eeb4 YH |
506 | |
507 | #ifdef CONFIG_TCP_MD5SIG | |
508 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ | |
b2e4b3de | 509 | const struct tcp_sock_af_ops *af_specific; |
cfb6eeb4 | 510 | |
b2e4b3de | 511 | /* TCP MD5 Signature Option information */ |
a8afca03 | 512 | struct tcp_md5sig_info __rcu *md5sig_info; |
cfb6eeb4 | 513 | #endif |
435cf559 WAS |
514 | |
515 | /* When the cookie options are generated and exchanged, then this | |
516 | * object holds a reference to them (cookie_values->kref). Also | |
517 | * contains related tcp_cookie_transactions fields. | |
518 | */ | |
519 | struct tcp_cookie_values *cookie_values; | |
10467163 JC |
520 | |
521 | /* TCP fastopen related information */ | |
522 | struct tcp_fastopen_request *fastopen_req; | |
523 | /* fastopen_rsk points to request_sock that resulted in this big | |
524 | * socket. Used to retransmit SYNACKs etc. | |
525 | */ | |
526 | struct request_sock *fastopen_rsk; | |
1da177e4 LT |
527 | }; |
528 | ||
46d3ceab ED |
529 | enum tsq_flags { |
530 | TSQ_THROTTLED, | |
531 | TSQ_QUEUED, | |
6f458dfb ED |
532 | TCP_TSQ_DEFERRED, /* tcp_tasklet_func() found socket was owned */ |
533 | TCP_WRITE_TIMER_DEFERRED, /* tcp_write_timer() found socket was owned */ | |
534 | TCP_DELACK_TIMER_DEFERRED, /* tcp_delack_timer() found socket was owned */ | |
563d34d0 ED |
535 | TCP_MTU_REDUCED_DEFERRED, /* tcp_v{4|6}_err() could not call |
536 | * tcp_v{4|6}_mtu_reduced() | |
537 | */ | |
46d3ceab ED |
538 | }; |
539 | ||
1da177e4 LT |
540 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) |
541 | { | |
542 | return (struct tcp_sock *)sk; | |
543 | } | |
544 | ||
8feaf0c0 ACM |
545 | struct tcp_timewait_sock { |
546 | struct inet_timewait_sock tw_sk; | |
3a137d20 ACM |
547 | u32 tw_rcv_nxt; |
548 | u32 tw_snd_nxt; | |
549 | u32 tw_rcv_wnd; | |
550 | u32 tw_ts_recent; | |
8feaf0c0 | 551 | long tw_ts_recent_stamp; |
cfb6eeb4 | 552 | #ifdef CONFIG_TCP_MD5SIG |
2397849b | 553 | struct tcp_md5sig_key *tw_md5_key; |
cfb6eeb4 | 554 | #endif |
435cf559 WAS |
555 | /* Few sockets in timewait have cookies; in that case, then this |
556 | * object holds a reference to them (tw_cookie_values->kref). | |
557 | */ | |
558 | struct tcp_cookie_values *tw_cookie_values; | |
8feaf0c0 ACM |
559 | }; |
560 | ||
561 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) | |
562 | { | |
563 | return (struct tcp_timewait_sock *)sk; | |
564 | } | |
565 | ||
10467163 JC |
566 | static inline bool tcp_passive_fastopen(const struct sock *sk) |
567 | { | |
568 | return (sk->sk_state == TCP_SYN_RECV && | |
569 | tcp_sk(sk)->fastopen_rsk != NULL); | |
570 | } | |
571 | ||
572 | static inline bool fastopen_cookie_present(struct tcp_fastopen_cookie *foc) | |
573 | { | |
574 | return foc->len != -1; | |
575 | } | |
576 | ||
bb68b647 CP |
577 | extern void tcp_sock_destruct(struct sock *sk); |
578 | ||
10467163 JC |
579 | static inline int fastopen_init_queue(struct sock *sk, int backlog) |
580 | { | |
581 | struct request_sock_queue *queue = | |
582 | &inet_csk(sk)->icsk_accept_queue; | |
583 | ||
584 | if (queue->fastopenq == NULL) { | |
585 | queue->fastopenq = kzalloc( | |
586 | sizeof(struct fastopen_queue), | |
587 | sk->sk_allocation); | |
588 | if (queue->fastopenq == NULL) | |
589 | return -ENOMEM; | |
bb68b647 CP |
590 | |
591 | sk->sk_destruct = tcp_sock_destruct; | |
10467163 JC |
592 | spin_lock_init(&queue->fastopenq->lock); |
593 | } | |
594 | queue->fastopenq->max_qlen = backlog; | |
595 | return 0; | |
596 | } | |
597 | ||
519855c5 | 598 | #endif /* __KERNEL__ */ |
1da177e4 LT |
599 | |
600 | #endif /* _LINUX_TCP_H */ |