Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * Definitions for the TCP protocol. | |
8 | * | |
9 | * Version: @(#)tcp.h 1.0.2 04/28/93 | |
10 | * | |
11 | * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> | |
1da177e4 LT |
12 | */ |
13 | #ifndef _LINUX_TCP_H | |
14 | #define _LINUX_TCP_H | |
15 | ||
1da177e4 | 16 | |
1da177e4 | 17 | #include <linux/skbuff.h> |
64033892 | 18 | #include <linux/win_minmax.h> |
1da177e4 | 19 | #include <net/sock.h> |
463c84b9 | 20 | #include <net/inet_connection_sock.h> |
8feaf0c0 | 21 | #include <net/inet_timewait_sock.h> |
607ca46e | 22 | #include <uapi/linux/tcp.h> |
1da177e4 | 23 | |
aa8223c7 ACM |
24 | static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb) |
25 | { | |
9c70220b | 26 | return (struct tcphdr *)skb_transport_header(skb); |
aa8223c7 ACM |
27 | } |
28 | ||
d9b3fca2 CG |
29 | static inline unsigned int __tcp_hdrlen(const struct tcphdr *th) |
30 | { | |
31 | return th->doff * 4; | |
32 | } | |
33 | ||
ab6a5bb6 ACM |
34 | static inline unsigned int tcp_hdrlen(const struct sk_buff *skb) |
35 | { | |
d9b3fca2 | 36 | return __tcp_hdrlen(tcp_hdr(skb)); |
ab6a5bb6 ACM |
37 | } |
38 | ||
6a674e9c JG |
39 | static inline struct tcphdr *inner_tcp_hdr(const struct sk_buff *skb) |
40 | { | |
41 | return (struct tcphdr *)skb_inner_transport_header(skb); | |
42 | } | |
43 | ||
44 | static inline unsigned int inner_tcp_hdrlen(const struct sk_buff *skb) | |
45 | { | |
46 | return inner_tcp_hdr(skb)->doff * 4; | |
47 | } | |
48 | ||
ab6a5bb6 ACM |
49 | static inline unsigned int tcp_optlen(const struct sk_buff *skb) |
50 | { | |
aa8223c7 | 51 | return (tcp_hdr(skb)->doff - 5) * 4; |
ab6a5bb6 ACM |
52 | } |
53 | ||
2100c8d2 YC |
54 | /* TCP Fast Open */ |
55 | #define TCP_FASTOPEN_COOKIE_MIN 4 /* Min Fast Open Cookie size in bytes */ | |
56 | #define TCP_FASTOPEN_COOKIE_MAX 16 /* Max Fast Open Cookie size in bytes */ | |
10467163 | 57 | #define TCP_FASTOPEN_COOKIE_SIZE 8 /* the size employed by this impl. */ |
2100c8d2 YC |
58 | |
59 | /* TCP Fast Open Cookie as stored in memory */ | |
60 | struct tcp_fastopen_cookie { | |
438ac880 | 61 | __le64 val[DIV_ROUND_UP(TCP_FASTOPEN_COOKIE_MAX, sizeof(u64))]; |
2100c8d2 | 62 | s8 len; |
7f9b838b | 63 | bool exp; /* In RFC6994 experimental option format */ |
2100c8d2 YC |
64 | }; |
65 | ||
1da177e4 | 66 | /* This defines a selective acknowledgement block. */ |
269bd27e AV |
67 | struct tcp_sack_block_wire { |
68 | __be32 start_seq; | |
69 | __be32 end_seq; | |
70 | }; | |
71 | ||
1da177e4 | 72 | struct tcp_sack_block { |
3a137d20 ACM |
73 | u32 start_seq; |
74 | u32 end_seq; | |
1da177e4 LT |
75 | }; |
76 | ||
ab56222a VS |
77 | /*These are used to set the sack_ok field in struct tcp_options_received */ |
78 | #define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */ | |
ab56222a VS |
79 | #define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/ |
80 | ||
1da177e4 LT |
81 | struct tcp_options_received { |
82 | /* PAWS/RTTM data */ | |
cca9bab1 | 83 | int ts_recent_stamp;/* Time we stored ts_recent (for aging) */ |
3a137d20 ACM |
84 | u32 ts_recent; /* Time stamp to echo next */ |
85 | u32 rcv_tsval; /* Time stamp value */ | |
86 | u32 rcv_tsecr; /* Time stamp echo reply */ | |
87 | u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ | |
1da177e4 LT |
88 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ |
89 | dsack : 1, /* D-SACK is scheduled */ | |
90 | wscale_ok : 1, /* Wscale seen on SYN packet */ | |
60e2a778 UB |
91 | sack_ok : 3, /* SACK seen on SYN packet */ |
92 | smc_ok : 1, /* SMC seen on SYN packet */ | |
1da177e4 LT |
93 | snd_wscale : 4, /* Window scaling received from sender */ |
94 | rcv_wscale : 4; /* Window scaling to send to receiver */ | |
3a137d20 | 95 | u8 num_sacks; /* Number of SACK blocks */ |
435cf559 | 96 | u16 user_mss; /* mss requested by user in ioctl */ |
3a137d20 | 97 | u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ |
1da177e4 LT |
98 | }; |
99 | ||
519855c5 WAS |
100 | static inline void tcp_clear_options(struct tcp_options_received *rx_opt) |
101 | { | |
435cf559 WAS |
102 | rx_opt->tstamp_ok = rx_opt->sack_ok = 0; |
103 | rx_opt->wscale_ok = rx_opt->snd_wscale = 0; | |
60e2a778 UB |
104 | #if IS_ENABLED(CONFIG_SMC) |
105 | rx_opt->smc_ok = 0; | |
106 | #endif | |
519855c5 WAS |
107 | } |
108 | ||
4389dded | 109 | /* This is the max number of SACKS that we'll generate and process. It's safe |
435cf559 | 110 | * to increase this, although since: |
4389dded AL |
111 | * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8) |
112 | * only four options will fit in a standard TCP header */ | |
113 | #define TCP_NUM_SACKS 4 | |
114 | ||
435cf559 WAS |
115 | struct tcp_request_sock_ops; |
116 | ||
2e6599cb | 117 | struct tcp_request_sock { |
cfb6eeb4 | 118 | struct inet_request_sock req; |
b2e4b3de | 119 | const struct tcp_request_sock_ops *af_specific; |
9a568de4 | 120 | u64 snt_synack; /* first SYNACK sent time */ |
9439ce00 | 121 | bool tfo_listener; |
58d607d3 | 122 | u32 txhash; |
435cf559 WAS |
123 | u32 rcv_isn; |
124 | u32 snt_isn; | |
95a22cae | 125 | u32 ts_off; |
a9b2c06d | 126 | u32 last_oow_ack_time; /* last SYNACK */ |
10467163 JC |
127 | u32 rcv_nxt; /* the ack # by SYNACK. For |
128 | * FastOpen it's the seq# | |
129 | * after data-in-SYN. | |
130 | */ | |
2e6599cb ACM |
131 | }; |
132 | ||
60236fdd | 133 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
2e6599cb ACM |
134 | { |
135 | return (struct tcp_request_sock *)req; | |
136 | } | |
137 | ||
1da177e4 | 138 | struct tcp_sock { |
463c84b9 ACM |
139 | /* inet_connection_sock has to be the first member of tcp_sock */ |
140 | struct inet_connection_sock inet_conn; | |
2ff52f28 | 141 | u16 tcp_header_len; /* Bytes of tcp header to send */ |
605ad7f1 | 142 | u16 gso_segs; /* Max number of segs per GSO packet */ |
1da177e4 | 143 | |
31770e34 FW |
144 | /* |
145 | * Header prediction flags | |
146 | * 0x5?10 << 16 + snd_wnd in net byte order | |
147 | */ | |
148 | __be32 pred_flags; | |
149 | ||
1da177e4 LT |
150 | /* |
151 | * RFC793 variables by their proper names. This means you can | |
152 | * read the code and the spec side by side (and laugh ...) | |
153 | * See RFC793 and RFC1122. The RFC writes these in capitals. | |
154 | */ | |
bdd1f9ed ED |
155 | u64 bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived |
156 | * sum(delta(rcv_nxt)), or how many bytes | |
157 | * were acked. | |
158 | */ | |
2efd055c MRL |
159 | u32 segs_in; /* RFC4898 tcpEStatsPerfSegsIn |
160 | * total number of segments in. | |
161 | */ | |
a44d6eac MKL |
162 | u32 data_segs_in; /* RFC4898 tcpEStatsPerfDataSegsIn |
163 | * total number of data segments in. | |
164 | */ | |
3a137d20 | 165 | u32 rcv_nxt; /* What we want to receive next */ |
54287cc1 ED |
166 | u32 copied_seq; /* Head of yet unread data */ |
167 | u32 rcv_wup; /* rcv_nxt on last window update sent */ | |
3a137d20 | 168 | u32 snd_nxt; /* Next sequence we send */ |
2efd055c MRL |
169 | u32 segs_out; /* RFC4898 tcpEStatsPerfSegsOut |
170 | * The total number of segments sent. | |
171 | */ | |
a44d6eac MKL |
172 | u32 data_segs_out; /* RFC4898 tcpEStatsPerfDataSegsOut |
173 | * total number of data segments sent. | |
174 | */ | |
ba113c3a WW |
175 | u64 bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut |
176 | * total number of data bytes sent. | |
177 | */ | |
0df48c26 ED |
178 | u64 bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked |
179 | * sum(delta(snd_una)), or how many bytes | |
180 | * were acked. | |
181 | */ | |
7e10b655 WW |
182 | u32 dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups |
183 | * total number of DSACK blocks received | |
184 | */ | |
3a137d20 ACM |
185 | u32 snd_una; /* First byte we want an ack for */ |
186 | u32 snd_sml; /* Last byte of the most recently transmitted small packet */ | |
187 | u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ | |
188 | u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ | |
f2b2c582 | 189 | u32 last_oow_ack_time; /* timestamp of last out-of-window ACK */ |
86de5921 | 190 | u32 compressed_ack_rcv_nxt; |
1da177e4 | 191 | |
ceaa1fef AV |
192 | u32 tsoffset; /* timestamp offset */ |
193 | ||
46d3ceab | 194 | struct list_head tsq_node; /* anchor in tsq_tasklet.head list */ |
e2080072 | 195 | struct list_head tsorted_sent_queue; /* time-sorted sent but un-SACKed skbs */ |
46d3ceab | 196 | |
3a137d20 ACM |
197 | u32 snd_wl1; /* Sequence for window update */ |
198 | u32 snd_wnd; /* The window we expect to receive */ | |
199 | u32 max_window; /* Maximal window ever seen from peer */ | |
200 | u32 mss_cache; /* Cached effective mss, not including SACKS */ | |
1da177e4 | 201 | |
3a137d20 ACM |
202 | u32 window_clamp; /* Maximal window to advertise */ |
203 | u32 rcv_ssthresh; /* Current window clamp */ | |
1da177e4 | 204 | |
659a8ad5 YC |
205 | /* Information of the most recently (s)acked skb */ |
206 | struct tcp_rack { | |
9a568de4 | 207 | u64 mstamp; /* (Re)sent time of the skb */ |
deed7be7 | 208 | u32 rtt_us; /* Associated RTT */ |
1d0833df | 209 | u32 end_seq; /* Ending TCP sequence of the skb */ |
1f255691 PJ |
210 | u32 last_delivered; /* tp->delivered at last reo_wnd adj */ |
211 | u8 reo_wnd_steps; /* Allowed reordering window */ | |
212 | #define TCP_RACK_RECOVERY_THRESH 16 | |
213 | u8 reo_wnd_persist:5, /* No. of recovery since last adj */ | |
214 | dsack_seen:1, /* Whether DSACK seen after last adj */ | |
7ec65372 | 215 | advanced:1; /* mstamp advanced since last lost marking */ |
659a8ad5 | 216 | } rack; |
b79eeeb9 | 217 | u16 advmss; /* Advertised MSS */ |
5d9f4262 | 218 | u8 compressed_ack; |
05b055e8 FY |
219 | u32 chrono_start; /* Start time in jiffies of a TCP chrono */ |
220 | u32 chrono_stat[3]; /* Time in jiffies for chrono_stat stats */ | |
221 | u8 chrono_type:2, /* current chronograph type */ | |
222 | rate_app_limited:1, /* rate_{delivered,interval_us} limited? */ | |
19f6d3f3 | 223 | fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */ |
71c02379 | 224 | fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */ |
d4761754 YS |
225 | is_sack_reneg:1, /* in recovery from loss with SACK reneg? */ |
226 | unused:2; | |
36e31b0a AP |
227 | u8 nonagle : 4,/* Disable Nagle algorithm? */ |
228 | thin_lto : 1,/* Use linear timeouts for thin streams */ | |
b75eba76 | 229 | recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */ |
e33099f9 YC |
230 | repair : 1, |
231 | frto : 1;/* F-RTO (RFC5682) activated in CA_Loss */ | |
ee995283 | 232 | u8 repair_queue; |
bec41a11 | 233 | u8 syn_data:1, /* SYN includes data */ |
6f73601e | 234 | syn_fastopen:1, /* SYN includes Fast Open option */ |
2646c831 | 235 | syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */ |
cf1ef3f0 | 236 | syn_fastopen_ch:1, /* Active TFO re-enabling probe */ |
ca8a2263 | 237 | syn_data_acked:1,/* data in SYN is acked by SYN-ACK */ |
cd8ae852 | 238 | save_syn:1, /* Save headers of SYN packet */ |
60e2a778 UB |
239 | is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */ |
240 | syn_smc:1; /* SYN includes SMC */ | |
9b717a8d | 241 | u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */ |
1da177e4 | 242 | |
a842fe14 | 243 | u32 tcp_tx_delay; /* delay (in usec) added to TX packets */ |
9799ccb0 | 244 | u64 tcp_wstamp_ns; /* departure time for next sent data packet */ |
5f6188a8 | 245 | u64 tcp_clock_cache; /* cache last tcp_clock_ns() (see tcp_mstamp_refresh()) */ |
9799ccb0 | 246 | |
1da177e4 | 247 | /* RTT measurement */ |
9a568de4 | 248 | u64 tcp_mstamp; /* most recent packet received/sent */ |
740b0f18 ED |
249 | u32 srtt_us; /* smoothed round trip time << 3 in usecs */ |
250 | u32 mdev_us; /* medium deviation */ | |
251 | u32 mdev_max_us; /* maximal mdev for the last rtt period */ | |
252 | u32 rttvar_us; /* smoothed mdev_max */ | |
3a137d20 | 253 | u32 rtt_seq; /* sequence number to update rttvar */ |
64033892 | 254 | struct minmax rtt_min; |
3a137d20 ACM |
255 | |
256 | u32 packets_out; /* Packets which are "in flight" */ | |
3a137d20 | 257 | u32 retrans_out; /* Retransmitted packets out */ |
ca8a2263 NC |
258 | u32 max_packets_out; /* max packets_out in last window */ |
259 | u32 max_packets_seq; /* right edge of max_packets_out flight */ | |
b79eeeb9 IJ |
260 | |
261 | u16 urg_data; /* Saved octet of OOB data and control flags */ | |
b79eeeb9 | 262 | u8 ecn_flags; /* ECN status bits. */ |
dca145ff ED |
263 | u8 keepalive_probes; /* num of allowed keep alive probes */ |
264 | u32 reordering; /* Packet reordering metric. */ | |
7ec65372 | 265 | u32 reord_seen; /* number of data packet reordering events */ |
33f5f57e IJ |
266 | u32 snd_up; /* Urgent pointer */ |
267 | ||
1da177e4 LT |
268 | /* |
269 | * Options received (usually on last packet, some only on SYN packets). | |
270 | */ | |
1da177e4 LT |
271 | struct tcp_options_received rx_opt; |
272 | ||
273 | /* | |
274 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) | |
275 | */ | |
3a137d20 ACM |
276 | u32 snd_ssthresh; /* Slow start size threshold */ |
277 | u32 snd_cwnd; /* Sending congestion window */ | |
f78a1b38 | 278 | u32 snd_cwnd_cnt; /* Linear increase counter */ |
e0ef57cc | 279 | u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ |
3a137d20 ACM |
280 | u32 snd_cwnd_used; |
281 | u32 snd_cwnd_stamp; | |
4faf7839 | 282 | u32 prior_cwnd; /* cwnd right before starting loss recovery */ |
a262f0cd ND |
283 | u32 prr_delivered; /* Number of newly delivered packets to |
284 | * receiver in Recovery. */ | |
285 | u32 prr_out; /* Total number of pkts sent during Recovery. */ | |
ddf1af6f | 286 | u32 delivered; /* Total data packets delivered incl. rexmits */ |
e21db6f6 | 287 | u32 delivered_ce; /* Like the above but only ECE marked packets */ |
0682e690 | 288 | u32 lost; /* Total data packets lost incl. rexmits */ |
d7722e85 | 289 | u32 app_limited; /* limited until "delivered" reaches this val */ |
9a568de4 ED |
290 | u64 first_tx_mstamp; /* start of window send phase */ |
291 | u64 delivered_mstamp; /* time we reached "delivered" */ | |
eb8329e0 YC |
292 | u32 rate_delivered; /* saved rate sample: packets delivered */ |
293 | u32 rate_interval_us; /* saved rate sample: time elapsed */ | |
1da177e4 | 294 | |
3a137d20 | 295 | u32 rcv_wnd; /* Current receiver window */ |
3a137d20 | 296 | u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |
c9bee3b7 | 297 | u32 notsent_lowat; /* TCP_NOTSENT_LOWAT */ |
3a137d20 | 298 | u32 pushed_seq; /* Last pushed seq, required to talk to windows */ |
b79eeeb9 IJ |
299 | u32 lost_out; /* Lost packets */ |
300 | u32 sacked_out; /* SACK'd packets */ | |
1da177e4 | 301 | |
218af599 | 302 | struct hrtimer pacing_timer; |
5d9f4262 | 303 | struct hrtimer compressed_ack_timer; |
218af599 | 304 | |
b79eeeb9 IJ |
305 | /* from STCP, retrans queue hinting */ |
306 | struct sk_buff* lost_skb_hint; | |
b79eeeb9 | 307 | struct sk_buff *retransmit_skb_hint; |
b79eeeb9 | 308 | |
9f5afeae YW |
309 | /* OOO segments go in this rbtree. Socket lock must be held. */ |
310 | struct rb_root out_of_order_queue; | |
311 | struct sk_buff *ooo_last_skb; /* cache rb_last(out_of_order_queue) */ | |
b79eeeb9 | 312 | |
c0a788c4 | 313 | /* SACKs data, these 2 need to be together (see tcp_options_write) */ |
1da177e4 LT |
314 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ |
315 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ | |
316 | ||
fd6dad61 | 317 | struct tcp_sack_block recv_sack_cache[4]; |
6a438bbe | 318 | |
ecb97192 NC |
319 | struct sk_buff *highest_sack; /* skb just after the highest |
320 | * skb with SACKed bit set | |
a47e5a98 IJ |
321 | * (validity guaranteed only if |
322 | * sacked_out > 0) | |
323 | */ | |
d738cd8f | 324 | |
6a438bbe | 325 | int lost_cnt_hint; |
6a438bbe | 326 | |
4b749440 | 327 | u32 prior_ssthresh; /* ssthresh saved at recovery start */ |
3a137d20 | 328 | u32 high_seq; /* snd_nxt at onset of congestion */ |
1da177e4 | 329 | |
3a137d20 | 330 | u32 retrans_stamp; /* Timestamp of the last retransmit, |
1da177e4 LT |
331 | * also used in SYN-SENT to remember stamp of |
332 | * the first SYN. */ | |
989e04c5 | 333 | u32 undo_marker; /* snd_una upon a new recovery episode. */ |
1da177e4 | 334 | int undo_retrans; /* number of undoable retransmissions. */ |
fb31c9b9 WW |
335 | u64 bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans |
336 | * Total data bytes retransmitted | |
337 | */ | |
b79eeeb9 IJ |
338 | u32 total_retrans; /* Total retransmits for entire connection */ |
339 | ||
3a137d20 | 340 | u32 urg_seq; /* Seq of received urgent pointer */ |
1da177e4 LT |
341 | unsigned int keepalive_time; /* time before keep alive takes place */ |
342 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ | |
1da177e4 | 343 | |
a0f82f64 | 344 | int linger2; |
1da177e4 | 345 | |
b13d8807 LB |
346 | |
347 | /* Sock_ops bpf program related variables */ | |
348 | #ifdef CONFIG_BPF | |
349 | u8 bpf_sock_ops_cb_flags; /* Control calling BPF programs | |
350 | * values defined in uapi/linux/tcp.h | |
351 | */ | |
352 | #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) (TP->bpf_sock_ops_cb_flags & ARG) | |
353 | #else | |
354 | #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0 | |
355 | #endif | |
356 | ||
f9af2dbb TH |
357 | u32 rcv_ooopack; /* Received out-of-order packets, for tcpinfo */ |
358 | ||
1da177e4 | 359 | /* Receiver side RTT estimation */ |
3f6c65d6 | 360 | u32 rcv_rtt_last_tsecr; |
1da177e4 | 361 | struct { |
9a568de4 ED |
362 | u32 rtt_us; |
363 | u32 seq; | |
364 | u64 time; | |
1da177e4 LT |
365 | } rcv_rtt_est; |
366 | ||
367 | /* Receiver queue space */ | |
368 | struct { | |
607065ba | 369 | u32 space; |
9a568de4 ED |
370 | u32 seq; |
371 | u64 time; | |
1da177e4 | 372 | } rcvq_space; |
0e7b1368 JH |
373 | |
374 | /* TCP-specific MTU probe information. */ | |
375 | struct { | |
3a137d20 ACM |
376 | u32 probe_seq_start; |
377 | u32 probe_seq_end; | |
0e7b1368 | 378 | } mtu_probe; |
563d34d0 ED |
379 | u32 mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG |
380 | * while socket was owned by user. | |
381 | */ | |
cfb6eeb4 YH |
382 | |
383 | #ifdef CONFIG_TCP_MD5SIG | |
384 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ | |
b2e4b3de | 385 | const struct tcp_sock_af_ops *af_specific; |
cfb6eeb4 | 386 | |
b2e4b3de | 387 | /* TCP MD5 Signature Option information */ |
a8afca03 | 388 | struct tcp_md5sig_info __rcu *md5sig_info; |
cfb6eeb4 | 389 | #endif |
435cf559 | 390 | |
10467163 JC |
391 | /* TCP fastopen related information */ |
392 | struct tcp_fastopen_request *fastopen_req; | |
393 | /* fastopen_rsk points to request_sock that resulted in this big | |
394 | * socket. Used to retransmit SYNACKs etc. | |
395 | */ | |
d983ea6f | 396 | struct request_sock __rcu *fastopen_rsk; |
cd8ae852 | 397 | u32 *saved_syn; |
1da177e4 LT |
398 | }; |
399 | ||
40fc3423 | 400 | enum tsq_enum { |
46d3ceab ED |
401 | TSQ_THROTTLED, |
402 | TSQ_QUEUED, | |
6f458dfb ED |
403 | TCP_TSQ_DEFERRED, /* tcp_tasklet_func() found socket was owned */ |
404 | TCP_WRITE_TIMER_DEFERRED, /* tcp_write_timer() found socket was owned */ | |
405 | TCP_DELACK_TIMER_DEFERRED, /* tcp_delack_timer() found socket was owned */ | |
563d34d0 ED |
406 | TCP_MTU_REDUCED_DEFERRED, /* tcp_v{4|6}_err() could not call |
407 | * tcp_v{4|6}_mtu_reduced() | |
408 | */ | |
46d3ceab ED |
409 | }; |
410 | ||
40fc3423 ED |
411 | enum tsq_flags { |
412 | TSQF_THROTTLED = (1UL << TSQ_THROTTLED), | |
413 | TSQF_QUEUED = (1UL << TSQ_QUEUED), | |
414 | TCPF_TSQ_DEFERRED = (1UL << TCP_TSQ_DEFERRED), | |
415 | TCPF_WRITE_TIMER_DEFERRED = (1UL << TCP_WRITE_TIMER_DEFERRED), | |
416 | TCPF_DELACK_TIMER_DEFERRED = (1UL << TCP_DELACK_TIMER_DEFERRED), | |
417 | TCPF_MTU_REDUCED_DEFERRED = (1UL << TCP_MTU_REDUCED_DEFERRED), | |
418 | }; | |
419 | ||
1da177e4 LT |
420 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) |
421 | { | |
422 | return (struct tcp_sock *)sk; | |
423 | } | |
424 | ||
8feaf0c0 ACM |
425 | struct tcp_timewait_sock { |
426 | struct inet_timewait_sock tw_sk; | |
d475f090 ED |
427 | #define tw_rcv_nxt tw_sk.__tw_common.skc_tw_rcv_nxt |
428 | #define tw_snd_nxt tw_sk.__tw_common.skc_tw_snd_nxt | |
3a137d20 | 429 | u32 tw_rcv_wnd; |
ceaa1fef | 430 | u32 tw_ts_offset; |
3a137d20 | 431 | u32 tw_ts_recent; |
4fb17a60 NC |
432 | |
433 | /* The time we sent the last out-of-window ACK: */ | |
434 | u32 tw_last_oow_ack_time; | |
435 | ||
cca9bab1 | 436 | int tw_ts_recent_stamp; |
a842fe14 | 437 | u32 tw_tx_delay; |
cfb6eeb4 | 438 | #ifdef CONFIG_TCP_MD5SIG |
2397849b | 439 | struct tcp_md5sig_key *tw_md5_key; |
cfb6eeb4 | 440 | #endif |
8feaf0c0 ACM |
441 | }; |
442 | ||
443 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) | |
444 | { | |
445 | return (struct tcp_timewait_sock *)sk; | |
446 | } | |
447 | ||
10467163 JC |
448 | static inline bool tcp_passive_fastopen(const struct sock *sk) |
449 | { | |
d983ea6f ED |
450 | return sk->sk_state == TCP_SYN_RECV && |
451 | rcu_access_pointer(tcp_sk(sk)->fastopen_rsk) != NULL; | |
10467163 JC |
452 | } |
453 | ||
0536fcc0 | 454 | static inline void fastopen_queue_tune(struct sock *sk, int backlog) |
10467163 | 455 | { |
0536fcc0 | 456 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; |
dbf650b6 | 457 | int somaxconn = READ_ONCE(sock_net(sk)->core.sysctl_somaxconn); |
0536fcc0 | 458 | |
dbf650b6 | 459 | queue->fastopenq.max_qlen = min_t(unsigned int, backlog, somaxconn); |
10467163 JC |
460 | } |
461 | ||
805c4bc0 ED |
462 | static inline void tcp_move_syn(struct tcp_sock *tp, |
463 | struct request_sock *req) | |
464 | { | |
465 | tp->saved_syn = req->saved_syn; | |
466 | req->saved_syn = NULL; | |
467 | } | |
468 | ||
cd8ae852 ED |
469 | static inline void tcp_saved_syn_free(struct tcp_sock *tp) |
470 | { | |
471 | kfree(tp->saved_syn); | |
472 | tp->saved_syn = NULL; | |
473 | } | |
474 | ||
1c885808 FY |
475 | struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk); |
476 | ||
3541f9e8 ED |
477 | static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss) |
478 | { | |
479 | /* We use READ_ONCE() here because socket might not be locked. | |
480 | * This happens for listeners. | |
481 | */ | |
482 | u16 user_mss = READ_ONCE(tp->rx_opt.user_mss); | |
483 | ||
484 | return (user_mss && user_mss < mss) ? user_mss : mss; | |
485 | } | |
3b4929f6 ED |
486 | |
487 | int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, | |
488 | int shiftlen); | |
489 | ||
1da177e4 | 490 | #endif /* _LINUX_TCP_H */ |