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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 { | |
003c9410 SN |
61 | union { |
62 | u8 val[TCP_FASTOPEN_COOKIE_MAX]; | |
63 | #if IS_ENABLED(CONFIG_IPV6) | |
64 | struct in6_addr addr; | |
65 | #endif | |
66 | }; | |
2100c8d2 | 67 | s8 len; |
7f9b838b | 68 | bool exp; /* In RFC6994 experimental option format */ |
2100c8d2 YC |
69 | }; |
70 | ||
1da177e4 | 71 | /* This defines a selective acknowledgement block. */ |
269bd27e AV |
72 | struct tcp_sack_block_wire { |
73 | __be32 start_seq; | |
74 | __be32 end_seq; | |
75 | }; | |
76 | ||
1da177e4 | 77 | struct tcp_sack_block { |
3a137d20 ACM |
78 | u32 start_seq; |
79 | u32 end_seq; | |
1da177e4 LT |
80 | }; |
81 | ||
ab56222a VS |
82 | /*These are used to set the sack_ok field in struct tcp_options_received */ |
83 | #define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */ | |
ab56222a VS |
84 | #define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/ |
85 | ||
1da177e4 LT |
86 | struct tcp_options_received { |
87 | /* PAWS/RTTM data */ | |
cca9bab1 | 88 | int ts_recent_stamp;/* Time we stored ts_recent (for aging) */ |
3a137d20 ACM |
89 | u32 ts_recent; /* Time stamp to echo next */ |
90 | u32 rcv_tsval; /* Time stamp value */ | |
91 | u32 rcv_tsecr; /* Time stamp echo reply */ | |
92 | u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ | |
1da177e4 LT |
93 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ |
94 | dsack : 1, /* D-SACK is scheduled */ | |
95 | wscale_ok : 1, /* Wscale seen on SYN packet */ | |
60e2a778 UB |
96 | sack_ok : 3, /* SACK seen on SYN packet */ |
97 | smc_ok : 1, /* SMC seen on SYN packet */ | |
1da177e4 LT |
98 | snd_wscale : 4, /* Window scaling received from sender */ |
99 | rcv_wscale : 4; /* Window scaling to send to receiver */ | |
3a137d20 | 100 | u8 num_sacks; /* Number of SACK blocks */ |
435cf559 | 101 | u16 user_mss; /* mss requested by user in ioctl */ |
3a137d20 | 102 | u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ |
1da177e4 LT |
103 | }; |
104 | ||
519855c5 WAS |
105 | static inline void tcp_clear_options(struct tcp_options_received *rx_opt) |
106 | { | |
435cf559 WAS |
107 | rx_opt->tstamp_ok = rx_opt->sack_ok = 0; |
108 | rx_opt->wscale_ok = rx_opt->snd_wscale = 0; | |
60e2a778 UB |
109 | #if IS_ENABLED(CONFIG_SMC) |
110 | rx_opt->smc_ok = 0; | |
111 | #endif | |
519855c5 WAS |
112 | } |
113 | ||
4389dded | 114 | /* This is the max number of SACKS that we'll generate and process. It's safe |
435cf559 | 115 | * to increase this, although since: |
4389dded AL |
116 | * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8) |
117 | * only four options will fit in a standard TCP header */ | |
118 | #define TCP_NUM_SACKS 4 | |
119 | ||
435cf559 WAS |
120 | struct tcp_request_sock_ops; |
121 | ||
2e6599cb | 122 | struct tcp_request_sock { |
cfb6eeb4 | 123 | struct inet_request_sock req; |
b2e4b3de | 124 | const struct tcp_request_sock_ops *af_specific; |
9a568de4 | 125 | u64 snt_synack; /* first SYNACK sent time */ |
9439ce00 | 126 | bool tfo_listener; |
58d607d3 | 127 | u32 txhash; |
435cf559 WAS |
128 | u32 rcv_isn; |
129 | u32 snt_isn; | |
95a22cae | 130 | u32 ts_off; |
a9b2c06d | 131 | u32 last_oow_ack_time; /* last SYNACK */ |
10467163 JC |
132 | u32 rcv_nxt; /* the ack # by SYNACK. For |
133 | * FastOpen it's the seq# | |
134 | * after data-in-SYN. | |
135 | */ | |
2e6599cb ACM |
136 | }; |
137 | ||
60236fdd | 138 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
2e6599cb ACM |
139 | { |
140 | return (struct tcp_request_sock *)req; | |
141 | } | |
142 | ||
1da177e4 | 143 | struct tcp_sock { |
463c84b9 ACM |
144 | /* inet_connection_sock has to be the first member of tcp_sock */ |
145 | struct inet_connection_sock inet_conn; | |
2ff52f28 | 146 | u16 tcp_header_len; /* Bytes of tcp header to send */ |
605ad7f1 | 147 | u16 gso_segs; /* Max number of segs per GSO packet */ |
1da177e4 | 148 | |
31770e34 FW |
149 | /* |
150 | * Header prediction flags | |
151 | * 0x5?10 << 16 + snd_wnd in net byte order | |
152 | */ | |
153 | __be32 pred_flags; | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * RFC793 variables by their proper names. This means you can | |
157 | * read the code and the spec side by side (and laugh ...) | |
158 | * See RFC793 and RFC1122. The RFC writes these in capitals. | |
159 | */ | |
bdd1f9ed ED |
160 | u64 bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived |
161 | * sum(delta(rcv_nxt)), or how many bytes | |
162 | * were acked. | |
163 | */ | |
2efd055c MRL |
164 | u32 segs_in; /* RFC4898 tcpEStatsPerfSegsIn |
165 | * total number of segments in. | |
166 | */ | |
a44d6eac MKL |
167 | u32 data_segs_in; /* RFC4898 tcpEStatsPerfDataSegsIn |
168 | * total number of data segments in. | |
169 | */ | |
3a137d20 | 170 | u32 rcv_nxt; /* What we want to receive next */ |
54287cc1 ED |
171 | u32 copied_seq; /* Head of yet unread data */ |
172 | u32 rcv_wup; /* rcv_nxt on last window update sent */ | |
3a137d20 | 173 | u32 snd_nxt; /* Next sequence we send */ |
2efd055c MRL |
174 | u32 segs_out; /* RFC4898 tcpEStatsPerfSegsOut |
175 | * The total number of segments sent. | |
176 | */ | |
a44d6eac MKL |
177 | u32 data_segs_out; /* RFC4898 tcpEStatsPerfDataSegsOut |
178 | * total number of data segments sent. | |
179 | */ | |
ba113c3a WW |
180 | u64 bytes_sent; /* RFC4898 tcpEStatsPerfHCDataOctetsOut |
181 | * total number of data bytes sent. | |
182 | */ | |
0df48c26 ED |
183 | u64 bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked |
184 | * sum(delta(snd_una)), or how many bytes | |
185 | * were acked. | |
186 | */ | |
7e10b655 WW |
187 | u32 dsack_dups; /* RFC4898 tcpEStatsStackDSACKDups |
188 | * total number of DSACK blocks received | |
189 | */ | |
3a137d20 ACM |
190 | u32 snd_una; /* First byte we want an ack for */ |
191 | u32 snd_sml; /* Last byte of the most recently transmitted small packet */ | |
192 | u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ | |
193 | u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ | |
f2b2c582 | 194 | u32 last_oow_ack_time; /* timestamp of last out-of-window ACK */ |
86de5921 | 195 | u32 compressed_ack_rcv_nxt; |
1da177e4 | 196 | |
ceaa1fef AV |
197 | u32 tsoffset; /* timestamp offset */ |
198 | ||
46d3ceab | 199 | struct list_head tsq_node; /* anchor in tsq_tasklet.head list */ |
e2080072 | 200 | struct list_head tsorted_sent_queue; /* time-sorted sent but un-SACKed skbs */ |
46d3ceab | 201 | |
3a137d20 ACM |
202 | u32 snd_wl1; /* Sequence for window update */ |
203 | u32 snd_wnd; /* The window we expect to receive */ | |
204 | u32 max_window; /* Maximal window ever seen from peer */ | |
205 | u32 mss_cache; /* Cached effective mss, not including SACKS */ | |
1da177e4 | 206 | |
3a137d20 ACM |
207 | u32 window_clamp; /* Maximal window to advertise */ |
208 | u32 rcv_ssthresh; /* Current window clamp */ | |
1da177e4 | 209 | |
659a8ad5 YC |
210 | /* Information of the most recently (s)acked skb */ |
211 | struct tcp_rack { | |
9a568de4 | 212 | u64 mstamp; /* (Re)sent time of the skb */ |
deed7be7 | 213 | u32 rtt_us; /* Associated RTT */ |
1d0833df | 214 | u32 end_seq; /* Ending TCP sequence of the skb */ |
1f255691 PJ |
215 | u32 last_delivered; /* tp->delivered at last reo_wnd adj */ |
216 | u8 reo_wnd_steps; /* Allowed reordering window */ | |
217 | #define TCP_RACK_RECOVERY_THRESH 16 | |
218 | u8 reo_wnd_persist:5, /* No. of recovery since last adj */ | |
219 | dsack_seen:1, /* Whether DSACK seen after last adj */ | |
7ec65372 | 220 | advanced:1; /* mstamp advanced since last lost marking */ |
659a8ad5 | 221 | } rack; |
b79eeeb9 | 222 | u16 advmss; /* Advertised MSS */ |
5d9f4262 | 223 | u8 compressed_ack; |
05b055e8 FY |
224 | u32 chrono_start; /* Start time in jiffies of a TCP chrono */ |
225 | u32 chrono_stat[3]; /* Time in jiffies for chrono_stat stats */ | |
226 | u8 chrono_type:2, /* current chronograph type */ | |
227 | rate_app_limited:1, /* rate_{delivered,interval_us} limited? */ | |
19f6d3f3 | 228 | fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */ |
71c02379 | 229 | fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */ |
d4761754 YS |
230 | is_sack_reneg:1, /* in recovery from loss with SACK reneg? */ |
231 | unused:2; | |
36e31b0a AP |
232 | u8 nonagle : 4,/* Disable Nagle algorithm? */ |
233 | thin_lto : 1,/* Use linear timeouts for thin streams */ | |
b75eba76 | 234 | recvmsg_inq : 1,/* Indicate # of bytes in queue upon recvmsg */ |
e33099f9 YC |
235 | repair : 1, |
236 | frto : 1;/* F-RTO (RFC5682) activated in CA_Loss */ | |
ee995283 | 237 | u8 repair_queue; |
bec41a11 | 238 | u8 syn_data:1, /* SYN includes data */ |
6f73601e | 239 | syn_fastopen:1, /* SYN includes Fast Open option */ |
2646c831 | 240 | syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */ |
cf1ef3f0 | 241 | syn_fastopen_ch:1, /* Active TFO re-enabling probe */ |
ca8a2263 | 242 | syn_data_acked:1,/* data in SYN is acked by SYN-ACK */ |
cd8ae852 | 243 | save_syn:1, /* Save headers of SYN packet */ |
60e2a778 UB |
244 | is_cwnd_limited:1,/* forward progress limited by snd_cwnd? */ |
245 | syn_smc:1; /* SYN includes SMC */ | |
9b717a8d | 246 | u32 tlp_high_seq; /* snd_nxt at the time of TLP retransmit. */ |
1da177e4 | 247 | |
9799ccb0 | 248 | u64 tcp_wstamp_ns; /* departure time for next sent data packet */ |
5f6188a8 | 249 | u64 tcp_clock_cache; /* cache last tcp_clock_ns() (see tcp_mstamp_refresh()) */ |
9799ccb0 | 250 | |
1da177e4 | 251 | /* RTT measurement */ |
9a568de4 | 252 | u64 tcp_mstamp; /* most recent packet received/sent */ |
740b0f18 ED |
253 | u32 srtt_us; /* smoothed round trip time << 3 in usecs */ |
254 | u32 mdev_us; /* medium deviation */ | |
255 | u32 mdev_max_us; /* maximal mdev for the last rtt period */ | |
256 | u32 rttvar_us; /* smoothed mdev_max */ | |
3a137d20 | 257 | u32 rtt_seq; /* sequence number to update rttvar */ |
64033892 | 258 | struct minmax rtt_min; |
3a137d20 ACM |
259 | |
260 | u32 packets_out; /* Packets which are "in flight" */ | |
3a137d20 | 261 | u32 retrans_out; /* Retransmitted packets out */ |
ca8a2263 NC |
262 | u32 max_packets_out; /* max packets_out in last window */ |
263 | u32 max_packets_seq; /* right edge of max_packets_out flight */ | |
b79eeeb9 IJ |
264 | |
265 | u16 urg_data; /* Saved octet of OOB data and control flags */ | |
b79eeeb9 | 266 | u8 ecn_flags; /* ECN status bits. */ |
dca145ff ED |
267 | u8 keepalive_probes; /* num of allowed keep alive probes */ |
268 | u32 reordering; /* Packet reordering metric. */ | |
7ec65372 | 269 | u32 reord_seen; /* number of data packet reordering events */ |
33f5f57e IJ |
270 | u32 snd_up; /* Urgent pointer */ |
271 | ||
1da177e4 LT |
272 | /* |
273 | * Options received (usually on last packet, some only on SYN packets). | |
274 | */ | |
1da177e4 LT |
275 | struct tcp_options_received rx_opt; |
276 | ||
277 | /* | |
278 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) | |
279 | */ | |
3a137d20 ACM |
280 | u32 snd_ssthresh; /* Slow start size threshold */ |
281 | u32 snd_cwnd; /* Sending congestion window */ | |
f78a1b38 | 282 | u32 snd_cwnd_cnt; /* Linear increase counter */ |
e0ef57cc | 283 | u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ |
3a137d20 ACM |
284 | u32 snd_cwnd_used; |
285 | u32 snd_cwnd_stamp; | |
4faf7839 | 286 | u32 prior_cwnd; /* cwnd right before starting loss recovery */ |
a262f0cd ND |
287 | u32 prr_delivered; /* Number of newly delivered packets to |
288 | * receiver in Recovery. */ | |
289 | u32 prr_out; /* Total number of pkts sent during Recovery. */ | |
ddf1af6f | 290 | u32 delivered; /* Total data packets delivered incl. rexmits */ |
e21db6f6 | 291 | u32 delivered_ce; /* Like the above but only ECE marked packets */ |
0682e690 | 292 | u32 lost; /* Total data packets lost incl. rexmits */ |
d7722e85 | 293 | u32 app_limited; /* limited until "delivered" reaches this val */ |
9a568de4 ED |
294 | u64 first_tx_mstamp; /* start of window send phase */ |
295 | u64 delivered_mstamp; /* time we reached "delivered" */ | |
eb8329e0 YC |
296 | u32 rate_delivered; /* saved rate sample: packets delivered */ |
297 | u32 rate_interval_us; /* saved rate sample: time elapsed */ | |
1da177e4 | 298 | |
3a137d20 | 299 | u32 rcv_wnd; /* Current receiver window */ |
3a137d20 | 300 | u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |
c9bee3b7 | 301 | u32 notsent_lowat; /* TCP_NOTSENT_LOWAT */ |
3a137d20 | 302 | u32 pushed_seq; /* Last pushed seq, required to talk to windows */ |
b79eeeb9 IJ |
303 | u32 lost_out; /* Lost packets */ |
304 | u32 sacked_out; /* SACK'd packets */ | |
1da177e4 | 305 | |
218af599 | 306 | struct hrtimer pacing_timer; |
5d9f4262 | 307 | struct hrtimer compressed_ack_timer; |
218af599 | 308 | |
b79eeeb9 IJ |
309 | /* from STCP, retrans queue hinting */ |
310 | struct sk_buff* lost_skb_hint; | |
b79eeeb9 | 311 | struct sk_buff *retransmit_skb_hint; |
b79eeeb9 | 312 | |
9f5afeae YW |
313 | /* OOO segments go in this rbtree. Socket lock must be held. */ |
314 | struct rb_root out_of_order_queue; | |
315 | struct sk_buff *ooo_last_skb; /* cache rb_last(out_of_order_queue) */ | |
b79eeeb9 | 316 | |
c0a788c4 | 317 | /* SACKs data, these 2 need to be together (see tcp_options_write) */ |
1da177e4 LT |
318 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ |
319 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ | |
320 | ||
fd6dad61 | 321 | struct tcp_sack_block recv_sack_cache[4]; |
6a438bbe | 322 | |
ecb97192 NC |
323 | struct sk_buff *highest_sack; /* skb just after the highest |
324 | * skb with SACKed bit set | |
a47e5a98 IJ |
325 | * (validity guaranteed only if |
326 | * sacked_out > 0) | |
327 | */ | |
d738cd8f | 328 | |
6a438bbe | 329 | int lost_cnt_hint; |
6a438bbe | 330 | |
4b749440 | 331 | u32 prior_ssthresh; /* ssthresh saved at recovery start */ |
3a137d20 | 332 | u32 high_seq; /* snd_nxt at onset of congestion */ |
1da177e4 | 333 | |
3a137d20 | 334 | u32 retrans_stamp; /* Timestamp of the last retransmit, |
1da177e4 LT |
335 | * also used in SYN-SENT to remember stamp of |
336 | * the first SYN. */ | |
989e04c5 | 337 | u32 undo_marker; /* snd_una upon a new recovery episode. */ |
1da177e4 | 338 | int undo_retrans; /* number of undoable retransmissions. */ |
fb31c9b9 WW |
339 | u64 bytes_retrans; /* RFC4898 tcpEStatsPerfOctetsRetrans |
340 | * Total data bytes retransmitted | |
341 | */ | |
b79eeeb9 IJ |
342 | u32 total_retrans; /* Total retransmits for entire connection */ |
343 | ||
3a137d20 | 344 | u32 urg_seq; /* Seq of received urgent pointer */ |
1da177e4 LT |
345 | unsigned int keepalive_time; /* time before keep alive takes place */ |
346 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ | |
1da177e4 | 347 | |
a0f82f64 | 348 | int linger2; |
1da177e4 | 349 | |
b13d8807 LB |
350 | |
351 | /* Sock_ops bpf program related variables */ | |
352 | #ifdef CONFIG_BPF | |
353 | u8 bpf_sock_ops_cb_flags; /* Control calling BPF programs | |
354 | * values defined in uapi/linux/tcp.h | |
355 | */ | |
356 | #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) (TP->bpf_sock_ops_cb_flags & ARG) | |
357 | #else | |
358 | #define BPF_SOCK_OPS_TEST_FLAG(TP, ARG) 0 | |
359 | #endif | |
360 | ||
1da177e4 | 361 | /* Receiver side RTT estimation */ |
3f6c65d6 | 362 | u32 rcv_rtt_last_tsecr; |
1da177e4 | 363 | struct { |
9a568de4 ED |
364 | u32 rtt_us; |
365 | u32 seq; | |
366 | u64 time; | |
1da177e4 LT |
367 | } rcv_rtt_est; |
368 | ||
369 | /* Receiver queue space */ | |
370 | struct { | |
607065ba | 371 | u32 space; |
9a568de4 ED |
372 | u32 seq; |
373 | u64 time; | |
1da177e4 | 374 | } rcvq_space; |
0e7b1368 JH |
375 | |
376 | /* TCP-specific MTU probe information. */ | |
377 | struct { | |
3a137d20 ACM |
378 | u32 probe_seq_start; |
379 | u32 probe_seq_end; | |
0e7b1368 | 380 | } mtu_probe; |
563d34d0 ED |
381 | u32 mtu_info; /* We received an ICMP_FRAG_NEEDED / ICMPV6_PKT_TOOBIG |
382 | * while socket was owned by user. | |
383 | */ | |
cfb6eeb4 YH |
384 | |
385 | #ifdef CONFIG_TCP_MD5SIG | |
386 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ | |
b2e4b3de | 387 | const struct tcp_sock_af_ops *af_specific; |
cfb6eeb4 | 388 | |
b2e4b3de | 389 | /* TCP MD5 Signature Option information */ |
a8afca03 | 390 | struct tcp_md5sig_info __rcu *md5sig_info; |
cfb6eeb4 | 391 | #endif |
435cf559 | 392 | |
10467163 JC |
393 | /* TCP fastopen related information */ |
394 | struct tcp_fastopen_request *fastopen_req; | |
395 | /* fastopen_rsk points to request_sock that resulted in this big | |
396 | * socket. Used to retransmit SYNACKs etc. | |
397 | */ | |
398 | struct request_sock *fastopen_rsk; | |
cd8ae852 | 399 | u32 *saved_syn; |
1da177e4 LT |
400 | }; |
401 | ||
40fc3423 | 402 | enum tsq_enum { |
46d3ceab ED |
403 | TSQ_THROTTLED, |
404 | TSQ_QUEUED, | |
6f458dfb ED |
405 | TCP_TSQ_DEFERRED, /* tcp_tasklet_func() found socket was owned */ |
406 | TCP_WRITE_TIMER_DEFERRED, /* tcp_write_timer() found socket was owned */ | |
407 | TCP_DELACK_TIMER_DEFERRED, /* tcp_delack_timer() found socket was owned */ | |
563d34d0 ED |
408 | TCP_MTU_REDUCED_DEFERRED, /* tcp_v{4|6}_err() could not call |
409 | * tcp_v{4|6}_mtu_reduced() | |
410 | */ | |
46d3ceab ED |
411 | }; |
412 | ||
40fc3423 ED |
413 | enum tsq_flags { |
414 | TSQF_THROTTLED = (1UL << TSQ_THROTTLED), | |
415 | TSQF_QUEUED = (1UL << TSQ_QUEUED), | |
416 | TCPF_TSQ_DEFERRED = (1UL << TCP_TSQ_DEFERRED), | |
417 | TCPF_WRITE_TIMER_DEFERRED = (1UL << TCP_WRITE_TIMER_DEFERRED), | |
418 | TCPF_DELACK_TIMER_DEFERRED = (1UL << TCP_DELACK_TIMER_DEFERRED), | |
419 | TCPF_MTU_REDUCED_DEFERRED = (1UL << TCP_MTU_REDUCED_DEFERRED), | |
420 | }; | |
421 | ||
1da177e4 LT |
422 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) |
423 | { | |
424 | return (struct tcp_sock *)sk; | |
425 | } | |
426 | ||
8feaf0c0 ACM |
427 | struct tcp_timewait_sock { |
428 | struct inet_timewait_sock tw_sk; | |
d475f090 ED |
429 | #define tw_rcv_nxt tw_sk.__tw_common.skc_tw_rcv_nxt |
430 | #define tw_snd_nxt tw_sk.__tw_common.skc_tw_snd_nxt | |
3a137d20 | 431 | u32 tw_rcv_wnd; |
ceaa1fef | 432 | u32 tw_ts_offset; |
3a137d20 | 433 | u32 tw_ts_recent; |
4fb17a60 NC |
434 | |
435 | /* The time we sent the last out-of-window ACK: */ | |
436 | u32 tw_last_oow_ack_time; | |
437 | ||
cca9bab1 | 438 | int tw_ts_recent_stamp; |
cfb6eeb4 | 439 | #ifdef CONFIG_TCP_MD5SIG |
2397849b | 440 | struct tcp_md5sig_key *tw_md5_key; |
cfb6eeb4 | 441 | #endif |
8feaf0c0 ACM |
442 | }; |
443 | ||
444 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) | |
445 | { | |
446 | return (struct tcp_timewait_sock *)sk; | |
447 | } | |
448 | ||
10467163 JC |
449 | static inline bool tcp_passive_fastopen(const struct sock *sk) |
450 | { | |
451 | return (sk->sk_state == TCP_SYN_RECV && | |
452 | tcp_sk(sk)->fastopen_rsk != NULL); | |
453 | } | |
454 | ||
0536fcc0 | 455 | static inline void fastopen_queue_tune(struct sock *sk, int backlog) |
10467163 | 456 | { |
0536fcc0 | 457 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; |
dbf650b6 | 458 | int somaxconn = READ_ONCE(sock_net(sk)->core.sysctl_somaxconn); |
0536fcc0 | 459 | |
dbf650b6 | 460 | queue->fastopenq.max_qlen = min_t(unsigned int, backlog, somaxconn); |
10467163 JC |
461 | } |
462 | ||
805c4bc0 ED |
463 | static inline void tcp_move_syn(struct tcp_sock *tp, |
464 | struct request_sock *req) | |
465 | { | |
466 | tp->saved_syn = req->saved_syn; | |
467 | req->saved_syn = NULL; | |
468 | } | |
469 | ||
cd8ae852 ED |
470 | static inline void tcp_saved_syn_free(struct tcp_sock *tp) |
471 | { | |
472 | kfree(tp->saved_syn); | |
473 | tp->saved_syn = NULL; | |
474 | } | |
475 | ||
1c885808 FY |
476 | struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk); |
477 | ||
3541f9e8 ED |
478 | static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss) |
479 | { | |
480 | /* We use READ_ONCE() here because socket might not be locked. | |
481 | * This happens for listeners. | |
482 | */ | |
483 | u16 user_mss = READ_ONCE(tp->rx_opt.user_mss); | |
484 | ||
485 | return (user_mss && user_mss < mss) ? user_mss : mss; | |
486 | } | |
3b4929f6 ED |
487 | |
488 | int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, | |
489 | int shiftlen); | |
490 | ||
1da177e4 | 491 | #endif /* _LINUX_TCP_H */ |