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17#ifndef _LINUX_TCP_H
18#define _LINUX_TCP_H
19
20#include <linux/types.h>
21#include <asm/byteorder.h>
22#include <linux/socket.h>
23
24struct tcphdr {
25 __be16 source;
26 __be16 dest;
27 __be32 seq;
28 __be32 ack_seq;
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
54 __be16 window;
55 __sum16 check;
56 __be16 urg_ptr;
57};
58
59
60
61
62
63
64union tcp_word_hdr {
65 struct tcphdr hdr;
66 __be32 words[5];
67};
68
69#define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
70
71enum {
72 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)
82};
83
84
85
86
87#define TCP_MSS_DEFAULT 536U
88#define TCP_MSS_DESIRED 1220U
89
90
91#define TCP_NODELAY 1
92#define TCP_MAXSEG 2
93#define TCP_CORK 3
94#define TCP_KEEPIDLE 4
95#define TCP_KEEPINTVL 5
96#define TCP_KEEPCNT 6
97#define TCP_SYNCNT 7
98#define TCP_LINGER2 8
99#define TCP_DEFER_ACCEPT 9
100#define TCP_WINDOW_CLAMP 10
101#define TCP_INFO 11
102#define TCP_QUICKACK 12
103#define TCP_CONGESTION 13
104#define TCP_MD5SIG 14
105#define TCP_COOKIE_TRANSACTIONS 15
106#define TCP_THIN_LINEAR_TIMEOUTS 16
107#define TCP_THIN_DUPACK 17
108#define TCP_USER_TIMEOUT 18
109
110
111#define TCPI_OPT_TIMESTAMPS 1
112#define TCPI_OPT_SACK 2
113#define TCPI_OPT_WSCALE 4
114#define TCPI_OPT_ECN 8
115#define TCPI_OPT_ECN_SEEN 16
116
117enum tcp_ca_state {
118 TCP_CA_Open = 0,
119#define TCPF_CA_Open (1<<TCP_CA_Open)
120 TCP_CA_Disorder = 1,
121#define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
122 TCP_CA_CWR = 2,
123#define TCPF_CA_CWR (1<<TCP_CA_CWR)
124 TCP_CA_Recovery = 3,
125#define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
126 TCP_CA_Loss = 4
127#define TCPF_CA_Loss (1<<TCP_CA_Loss)
128};
129
130struct tcp_info {
131 __u8 tcpi_state;
132 __u8 tcpi_ca_state;
133 __u8 tcpi_retransmits;
134 __u8 tcpi_probes;
135 __u8 tcpi_backoff;
136 __u8 tcpi_options;
137 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
138
139 __u32 tcpi_rto;
140 __u32 tcpi_ato;
141 __u32 tcpi_snd_mss;
142 __u32 tcpi_rcv_mss;
143
144 __u32 tcpi_unacked;
145 __u32 tcpi_sacked;
146 __u32 tcpi_lost;
147 __u32 tcpi_retrans;
148 __u32 tcpi_fackets;
149
150
151 __u32 tcpi_last_data_sent;
152 __u32 tcpi_last_ack_sent;
153 __u32 tcpi_last_data_recv;
154 __u32 tcpi_last_ack_recv;
155
156
157 __u32 tcpi_pmtu;
158 __u32 tcpi_rcv_ssthresh;
159 __u32 tcpi_rtt;
160 __u32 tcpi_rttvar;
161 __u32 tcpi_snd_ssthresh;
162 __u32 tcpi_snd_cwnd;
163 __u32 tcpi_advmss;
164 __u32 tcpi_reordering;
165
166 __u32 tcpi_rcv_rtt;
167 __u32 tcpi_rcv_space;
168
169 __u32 tcpi_total_retrans;
170};
171
172
173#define TCP_MD5SIG_MAXKEYLEN 80
174
175struct tcp_md5sig {
176 struct __kernel_sockaddr_storage tcpm_addr;
177 __u16 __tcpm_pad1;
178 __u16 tcpm_keylen;
179 __u32 __tcpm_pad2;
180 __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN];
181};
182
183
184#define TCP_COOKIE_MIN 8
185#define TCP_COOKIE_MAX 16
186#define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX)
187
188
189#define TCP_COOKIE_IN_ALWAYS (1 << 0)
190#define TCP_COOKIE_OUT_NEVER (1 << 1)
191
192
193
194#define TCP_S_DATA_IN (1 << 2)
195#define TCP_S_DATA_OUT (1 << 3)
196
197
198struct tcp_cookie_transactions {
199 __u16 tcpct_flags;
200 __u8 __tcpct_pad1;
201 __u8 tcpct_cookie_desired;
202 __u16 tcpct_s_data_desired;
203 __u16 tcpct_used;
204 __u8 tcpct_value[TCP_MSS_DEFAULT];
205};
206
207#ifdef __KERNEL__
208
209#include <linux/skbuff.h>
210#include <linux/dmaengine.h>
211#include <net/sock.h>
212#include <net/inet_connection_sock.h>
213#include <net/inet_timewait_sock.h>
214
215static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
216{
217 return (struct tcphdr *)skb_transport_header(skb);
218}
219
220static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
221{
222 return tcp_hdr(skb)->doff * 4;
223}
224
225static inline unsigned int tcp_optlen(const struct sk_buff *skb)
226{
227 return (tcp_hdr(skb)->doff - 5) * 4;
228}
229
230
231struct tcp_sack_block_wire {
232 __be32 start_seq;
233 __be32 end_seq;
234};
235
236struct tcp_sack_block {
237 u32 start_seq;
238 u32 end_seq;
239};
240
241struct tcp_options_received {
242
243 long ts_recent_stamp;
244 u32 ts_recent;
245 u32 rcv_tsval;
246 u32 rcv_tsecr;
247 u16 saw_tstamp : 1,
248 tstamp_ok : 1,
249 dsack : 1,
250 wscale_ok : 1,
251 sack_ok : 4,
252 snd_wscale : 4,
253 rcv_wscale : 4;
254 u8 cookie_plus:6,
255 cookie_out_never:1,
256 cookie_in_always:1;
257 u8 num_sacks;
258 u16 user_mss;
259 u16 mss_clamp;
260};
261
262static inline void tcp_clear_options(struct tcp_options_received *rx_opt)
263{
264 rx_opt->tstamp_ok = rx_opt->sack_ok = 0;
265 rx_opt->wscale_ok = rx_opt->snd_wscale = 0;
266 rx_opt->cookie_plus = 0;
267}
268
269
270
271
272
273#define TCP_NUM_SACKS 4
274
275struct tcp_cookie_values;
276struct tcp_request_sock_ops;
277
278struct tcp_request_sock {
279 struct inet_request_sock req;
280#ifdef CONFIG_TCP_MD5SIG
281
282 const struct tcp_request_sock_ops *af_specific;
283#endif
284 u32 rcv_isn;
285 u32 snt_isn;
286 u32 snt_synack;
287};
288
289static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
290{
291 return (struct tcp_request_sock *)req;
292}
293
294struct tcp_sock {
295
296 struct inet_connection_sock inet_conn;
297 u16 tcp_header_len;
298 u16 xmit_size_goal_segs;
299
300
301
302
303
304 __be32 pred_flags;
305
306
307
308
309
310
311 u32 rcv_nxt;
312 u32 copied_seq;
313 u32 rcv_wup;
314 u32 snd_nxt;
315
316 u32 snd_una;
317 u32 snd_sml;
318 u32 rcv_tstamp;
319 u32 lsndtime;
320
321
322 struct {
323 struct sk_buff_head prequeue;
324 struct task_struct *task;
325 struct iovec *iov;
326 int memory;
327 int len;
328#ifdef CONFIG_NET_DMA
329
330 struct dma_chan *dma_chan;
331 int wakeup;
332 struct dma_pinned_list *pinned_list;
333 dma_cookie_t dma_cookie;
334#endif
335 } ucopy;
336
337 u32 snd_wl1;
338 u32 snd_wnd;
339 u32 max_window;
340 u32 mss_cache;
341
342 u32 window_clamp;
343 u32 rcv_ssthresh;
344
345 u32 frto_highmark;
346 u16 advmss;
347 u8 frto_counter;
348 u8 nonagle : 4,
349 thin_lto : 1,
350 thin_dupack : 1,
351 unused : 2;
352
353
354 u32 srtt;
355 u32 mdev;
356 u32 mdev_max;
357 u32 rttvar;
358 u32 rtt_seq;
359
360 u32 packets_out;
361 u32 retrans_out;
362
363 u16 urg_data;
364 u8 ecn_flags;
365 u8 reordering;
366 u32 snd_up;
367
368 u8 keepalive_probes;
369
370
371
372 struct tcp_options_received rx_opt;
373
374
375
376
377 u32 snd_ssthresh;
378 u32 snd_cwnd;
379 u32 snd_cwnd_cnt;
380 u32 snd_cwnd_clamp;
381 u32 snd_cwnd_used;
382 u32 snd_cwnd_stamp;
383 u32 prior_cwnd;
384 u32 prr_delivered;
385
386 u32 prr_out;
387
388 u32 rcv_wnd;
389 u32 write_seq;
390 u32 pushed_seq;
391 u32 lost_out;
392 u32 sacked_out;
393 u32 fackets_out;
394 u32 tso_deferred;
395 u32 bytes_acked;
396
397
398 struct sk_buff* lost_skb_hint;
399 struct sk_buff *scoreboard_skb_hint;
400 struct sk_buff *retransmit_skb_hint;
401
402 struct sk_buff_head out_of_order_queue;
403
404
405 struct tcp_sack_block duplicate_sack[1];
406 struct tcp_sack_block selective_acks[4];
407
408 struct tcp_sack_block recv_sack_cache[4];
409
410 struct sk_buff *highest_sack;
411
412
413
414
415 int lost_cnt_hint;
416 u32 retransmit_high;
417
418 u32 lost_retrans_low;
419
420 u32 prior_ssthresh;
421 u32 high_seq;
422
423 u32 retrans_stamp;
424
425
426 u32 undo_marker;
427 int undo_retrans;
428 u32 total_retrans;
429
430 u32 urg_seq;
431 unsigned int keepalive_time;
432 unsigned int keepalive_intvl;
433
434 int linger2;
435
436
437 struct {
438 u32 rtt;
439 u32 seq;
440 u32 time;
441 } rcv_rtt_est;
442
443
444 struct {
445 int space;
446 u32 seq;
447 u32 time;
448 } rcvq_space;
449
450
451 struct {
452 u32 probe_seq_start;
453 u32 probe_seq_end;
454 } mtu_probe;
455
456#ifdef CONFIG_TCP_MD5SIG
457
458 const struct tcp_sock_af_ops *af_specific;
459
460
461 struct tcp_md5sig_info *md5sig_info;
462#endif
463
464
465
466
467
468 struct tcp_cookie_values *cookie_values;
469};
470
471static inline struct tcp_sock *tcp_sk(const struct sock *sk)
472{
473 return (struct tcp_sock *)sk;
474}
475
476struct tcp_timewait_sock {
477 struct inet_timewait_sock tw_sk;
478 u32 tw_rcv_nxt;
479 u32 tw_snd_nxt;
480 u32 tw_rcv_wnd;
481 u32 tw_ts_recent;
482 long tw_ts_recent_stamp;
483#ifdef CONFIG_TCP_MD5SIG
484 u16 tw_md5_keylen;
485 u8 tw_md5_key[TCP_MD5SIG_MAXKEYLEN];
486#endif
487
488
489
490 struct tcp_cookie_values *tw_cookie_values;
491};
492
493static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
494{
495 return (struct tcp_timewait_sock *)sk;
496}
497
498#endif
499
500#endif
501