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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 AV |
54 | __be16 window; |
55 | __be16 check; | |
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 { | |
72 | TCP_FLAG_CWR = __constant_htonl(0x00800000), | |
73 | TCP_FLAG_ECE = __constant_htonl(0x00400000), | |
74 | TCP_FLAG_URG = __constant_htonl(0x00200000), | |
75 | TCP_FLAG_ACK = __constant_htonl(0x00100000), | |
76 | TCP_FLAG_PSH = __constant_htonl(0x00080000), | |
77 | TCP_FLAG_RST = __constant_htonl(0x00040000), | |
78 | TCP_FLAG_SYN = __constant_htonl(0x00020000), | |
79 | TCP_FLAG_FIN = __constant_htonl(0x00010000), | |
80 | TCP_RESERVED_BITS = __constant_htonl(0x0F000000), | |
81 | TCP_DATA_OFFSET = __constant_htonl(0xF0000000) | |
82 | }; | |
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 */ | |
5f8ef48d | 97 | #define TCP_CONGESTION 13 /* Congestion control algorithm */ |
cfb6eeb4 | 98 | #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ |
1da177e4 LT |
99 | |
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 | ||
105 | enum 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 | ||
119 | struct 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 | ||
cfb6eeb4 YH |
162 | /* for TCP_MD5SIG socket option */ |
163 | #define TCP_MD5SIG_MAXKEYLEN 80 | |
164 | ||
165 | struct 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 | ||
1da177e4 LT |
173 | #ifdef __KERNEL__ |
174 | ||
1da177e4 | 175 | #include <linux/skbuff.h> |
c8a553ad | 176 | #include <linux/dmaengine.h> |
1da177e4 | 177 | #include <net/sock.h> |
463c84b9 | 178 | #include <net/inet_connection_sock.h> |
8feaf0c0 | 179 | #include <net/inet_timewait_sock.h> |
1da177e4 LT |
180 | |
181 | /* This defines a selective acknowledgement block. */ | |
269bd27e AV |
182 | struct tcp_sack_block_wire { |
183 | __be32 start_seq; | |
184 | __be32 end_seq; | |
185 | }; | |
186 | ||
1da177e4 LT |
187 | struct tcp_sack_block { |
188 | __u32 start_seq; | |
189 | __u32 end_seq; | |
190 | }; | |
191 | ||
1da177e4 LT |
192 | struct tcp_options_received { |
193 | /* PAWS/RTTM data */ | |
194 | long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ | |
195 | __u32 ts_recent; /* Time stamp to echo next */ | |
196 | __u32 rcv_tsval; /* Time stamp value */ | |
197 | __u32 rcv_tsecr; /* Time stamp echo reply */ | |
198 | __u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ | |
199 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ | |
200 | dsack : 1, /* D-SACK is scheduled */ | |
201 | wscale_ok : 1, /* Wscale seen on SYN packet */ | |
202 | sack_ok : 4, /* SACK seen on SYN packet */ | |
203 | snd_wscale : 4, /* Window scaling received from sender */ | |
204 | rcv_wscale : 4; /* Window scaling to send to receiver */ | |
205 | /* SACKs data */ | |
206 | __u8 eff_sacks; /* Size of SACK array to send with next packet */ | |
207 | __u8 num_sacks; /* Number of SACK blocks */ | |
208 | __u16 user_mss; /* mss requested by user in ioctl */ | |
209 | __u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ | |
210 | }; | |
211 | ||
2e6599cb | 212 | struct tcp_request_sock { |
cfb6eeb4 YH |
213 | struct inet_request_sock req; |
214 | #ifdef CONFIG_TCP_MD5SIG | |
215 | /* Only used by TCP MD5 Signature so far. */ | |
216 | struct tcp_request_sock_ops *af_specific; | |
217 | #endif | |
218 | __u32 rcv_isn; | |
219 | __u32 snt_isn; | |
2e6599cb ACM |
220 | }; |
221 | ||
60236fdd | 222 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
2e6599cb ACM |
223 | { |
224 | return (struct tcp_request_sock *)req; | |
225 | } | |
226 | ||
1da177e4 | 227 | struct tcp_sock { |
463c84b9 ACM |
228 | /* inet_connection_sock has to be the first member of tcp_sock */ |
229 | struct inet_connection_sock inet_conn; | |
1da177e4 LT |
230 | int tcp_header_len; /* Bytes of tcp header to send */ |
231 | ||
232 | /* | |
233 | * Header prediction flags | |
234 | * 0x5?10 << 16 + snd_wnd in net byte order | |
235 | */ | |
dddc93c0 | 236 | __be32 pred_flags; |
1da177e4 LT |
237 | |
238 | /* | |
239 | * RFC793 variables by their proper names. This means you can | |
240 | * read the code and the spec side by side (and laugh ...) | |
241 | * See RFC793 and RFC1122. The RFC writes these in capitals. | |
242 | */ | |
243 | __u32 rcv_nxt; /* What we want to receive next */ | |
244 | __u32 snd_nxt; /* Next sequence we send */ | |
245 | ||
246 | __u32 snd_una; /* First byte we want an ack for */ | |
247 | __u32 snd_sml; /* Last byte of the most recently transmitted small packet */ | |
248 | __u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ | |
249 | __u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ | |
1da177e4 LT |
250 | |
251 | /* Data for direct copy to user */ | |
252 | struct { | |
253 | struct sk_buff_head prequeue; | |
254 | struct task_struct *task; | |
255 | struct iovec *iov; | |
256 | int memory; | |
257 | int len; | |
97fc2f08 CL |
258 | #ifdef CONFIG_NET_DMA |
259 | /* members for async copy */ | |
260 | struct dma_chan *dma_chan; | |
261 | int wakeup; | |
262 | struct dma_pinned_list *pinned_list; | |
263 | dma_cookie_t dma_cookie; | |
264 | #endif | |
1da177e4 LT |
265 | } ucopy; |
266 | ||
267 | __u32 snd_wl1; /* Sequence for window update */ | |
268 | __u32 snd_wnd; /* The window we expect to receive */ | |
269 | __u32 max_window; /* Maximal window ever seen from peer */ | |
1da177e4 | 270 | __u32 mss_cache; /* Cached effective mss, not including SACKS */ |
c1b4a7e6 | 271 | __u16 xmit_size_goal; /* Goal for segmenting output packets */ |
d83d8461 | 272 | /* XXX Two bytes hole, try to pack */ |
1da177e4 | 273 | |
1da177e4 LT |
274 | __u32 window_clamp; /* Maximal window to advertise */ |
275 | __u32 rcv_ssthresh; /* Current window clamp */ | |
276 | ||
277 | __u32 frto_highmark; /* snd_nxt when RTO occurred */ | |
278 | __u8 reordering; /* Packet reordering metric. */ | |
279 | __u8 frto_counter; /* Number of new acks after RTO */ | |
463c84b9 | 280 | __u8 nonagle; /* Disable Nagle algorithm? */ |
6687e988 | 281 | __u8 keepalive_probes; /* num of allowed keep alive probes */ |
1da177e4 LT |
282 | |
283 | /* RTT measurement */ | |
284 | __u32 srtt; /* smoothed round trip time << 3 */ | |
285 | __u32 mdev; /* medium deviation */ | |
286 | __u32 mdev_max; /* maximal mdev for the last rtt period */ | |
287 | __u32 rttvar; /* smoothed mdev_max */ | |
288 | __u32 rtt_seq; /* sequence number to update rttvar */ | |
1da177e4 LT |
289 | |
290 | __u32 packets_out; /* Packets which are "in flight" */ | |
291 | __u32 left_out; /* Packets which leaved network */ | |
292 | __u32 retrans_out; /* Retransmitted packets out */ | |
1da177e4 LT |
293 | /* |
294 | * Options received (usually on last packet, some only on SYN packets). | |
295 | */ | |
1da177e4 LT |
296 | struct tcp_options_received rx_opt; |
297 | ||
298 | /* | |
299 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) | |
300 | */ | |
301 | __u32 snd_ssthresh; /* Slow start size threshold */ | |
302 | __u32 snd_cwnd; /* Sending congestion window */ | |
303 | __u16 snd_cwnd_cnt; /* Linear increase counter */ | |
304 | __u16 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ | |
305 | __u32 snd_cwnd_used; | |
306 | __u32 snd_cwnd_stamp; | |
307 | ||
1da177e4 LT |
308 | struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ |
309 | ||
1da177e4 LT |
310 | __u32 rcv_wnd; /* Current receiver window */ |
311 | __u32 rcv_wup; /* rcv_nxt on last window update sent */ | |
312 | __u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ | |
313 | __u32 pushed_seq; /* Last pushed seq, required to talk to windows */ | |
314 | __u32 copied_seq; /* Head of yet unread data */ | |
315 | ||
316 | /* SACKs data */ | |
317 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ | |
318 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ | |
319 | ||
6a438bbe SH |
320 | struct tcp_sack_block recv_sack_cache[4]; |
321 | ||
322 | /* from STCP, retrans queue hinting */ | |
323 | struct sk_buff* lost_skb_hint; | |
324 | ||
325 | struct sk_buff *scoreboard_skb_hint; | |
326 | struct sk_buff *retransmit_skb_hint; | |
327 | struct sk_buff *forward_skb_hint; | |
328 | struct sk_buff *fastpath_skb_hint; | |
329 | ||
330 | int fastpath_cnt_hint; | |
331 | int lost_cnt_hint; | |
332 | int retransmit_cnt_hint; | |
333 | int forward_cnt_hint; | |
334 | ||
6687e988 | 335 | __u16 advmss; /* Advertised MSS */ |
1da177e4 LT |
336 | __u16 prior_ssthresh; /* ssthresh saved at recovery start */ |
337 | __u32 lost_out; /* Lost packets */ | |
338 | __u32 sacked_out; /* SACK'd packets */ | |
339 | __u32 fackets_out; /* FACK'd packets */ | |
340 | __u32 high_seq; /* snd_nxt at onset of congestion */ | |
341 | ||
342 | __u32 retrans_stamp; /* Timestamp of the last retransmit, | |
343 | * also used in SYN-SENT to remember stamp of | |
344 | * the first SYN. */ | |
345 | __u32 undo_marker; /* tracking retrans started here. */ | |
346 | int undo_retrans; /* number of undoable retransmissions. */ | |
347 | __u32 urg_seq; /* Seq of received urgent pointer */ | |
348 | __u16 urg_data; /* Saved octet of OOB data and control flags */ | |
1da177e4 | 349 | __u8 urg_mode; /* In urgent mode */ |
6687e988 | 350 | __u8 ecn_flags; /* ECN status bits. */ |
1da177e4 LT |
351 | __u32 snd_up; /* Urgent pointer */ |
352 | ||
353 | __u32 total_retrans; /* Total retransmits for entire connection */ | |
9772efb9 | 354 | __u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */ |
1da177e4 | 355 | |
1da177e4 LT |
356 | unsigned int keepalive_time; /* time before keep alive takes place */ |
357 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ | |
358 | int linger2; | |
359 | ||
360 | unsigned long last_synq_overflow; | |
361 | ||
ae8064ac JH |
362 | __u32 tso_deferred; |
363 | ||
1da177e4 LT |
364 | /* Receiver side RTT estimation */ |
365 | struct { | |
366 | __u32 rtt; | |
367 | __u32 seq; | |
368 | __u32 time; | |
369 | } rcv_rtt_est; | |
370 | ||
371 | /* Receiver queue space */ | |
372 | struct { | |
373 | int space; | |
374 | __u32 seq; | |
375 | __u32 time; | |
376 | } rcvq_space; | |
0e7b1368 JH |
377 | |
378 | /* TCP-specific MTU probe information. */ | |
379 | struct { | |
380 | __u32 probe_seq_start; | |
381 | __u32 probe_seq_end; | |
382 | } mtu_probe; | |
cfb6eeb4 YH |
383 | |
384 | #ifdef CONFIG_TCP_MD5SIG | |
385 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ | |
386 | struct tcp_sock_af_ops *af_specific; | |
387 | ||
388 | /* TCP MD5 Signagure Option information */ | |
389 | struct tcp_md5sig_info *md5sig_info; | |
390 | #endif | |
1da177e4 LT |
391 | }; |
392 | ||
393 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) | |
394 | { | |
395 | return (struct tcp_sock *)sk; | |
396 | } | |
397 | ||
8feaf0c0 ACM |
398 | struct tcp_timewait_sock { |
399 | struct inet_timewait_sock tw_sk; | |
400 | __u32 tw_rcv_nxt; | |
401 | __u32 tw_snd_nxt; | |
402 | __u32 tw_rcv_wnd; | |
403 | __u32 tw_ts_recent; | |
404 | long tw_ts_recent_stamp; | |
cfb6eeb4 YH |
405 | #ifdef CONFIG_TCP_MD5SIG |
406 | __u16 tw_md5_keylen; | |
407 | __u8 tw_md5_key[TCP_MD5SIG_MAXKEYLEN]; | |
408 | #endif | |
8feaf0c0 ACM |
409 | }; |
410 | ||
411 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) | |
412 | { | |
413 | return (struct tcp_timewait_sock *)sk; | |
414 | } | |
415 | ||
1da177e4 LT |
416 | #endif |
417 | ||
418 | #endif /* _LINUX_TCP_H */ |