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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 | * Implementation of the Transmission Control Protocol(TCP). | |
8 | * | |
02c30a84 | 9 | * Authors: Ross Biro |
1da177e4 LT |
10 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
11 | * Mark Evans, <evansmp@uhura.aston.ac.uk> | |
12 | * Corey Minyard <wf-rch!minyard@relay.EU.net> | |
13 | * Florian La Roche, <flla@stud.uni-sb.de> | |
14 | * Charles Hedrick, <hedrick@klinzhai.rutgers.edu> | |
15 | * Linus Torvalds, <torvalds@cs.helsinki.fi> | |
16 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
17 | * Matthew Dillon, <dillon@apollo.west.oic.com> | |
18 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
19 | * Jorge Cwik, <jorge@laser.satlink.net> | |
20 | * | |
21 | * Fixes: | |
22 | * Alan Cox : Numerous verify_area() calls | |
23 | * Alan Cox : Set the ACK bit on a reset | |
24 | * Alan Cox : Stopped it crashing if it closed while | |
25 | * sk->inuse=1 and was trying to connect | |
26 | * (tcp_err()). | |
27 | * Alan Cox : All icmp error handling was broken | |
28 | * pointers passed where wrong and the | |
29 | * socket was looked up backwards. Nobody | |
30 | * tested any icmp error code obviously. | |
31 | * Alan Cox : tcp_err() now handled properly. It | |
32 | * wakes people on errors. poll | |
33 | * behaves and the icmp error race | |
34 | * has gone by moving it into sock.c | |
35 | * Alan Cox : tcp_send_reset() fixed to work for | |
36 | * everything not just packets for | |
37 | * unknown sockets. | |
38 | * Alan Cox : tcp option processing. | |
39 | * Alan Cox : Reset tweaked (still not 100%) [Had | |
40 | * syn rule wrong] | |
41 | * Herp Rosmanith : More reset fixes | |
42 | * Alan Cox : No longer acks invalid rst frames. | |
43 | * Acking any kind of RST is right out. | |
44 | * Alan Cox : Sets an ignore me flag on an rst | |
45 | * receive otherwise odd bits of prattle | |
46 | * escape still | |
47 | * Alan Cox : Fixed another acking RST frame bug. | |
48 | * Should stop LAN workplace lockups. | |
49 | * Alan Cox : Some tidyups using the new skb list | |
50 | * facilities | |
51 | * Alan Cox : sk->keepopen now seems to work | |
52 | * Alan Cox : Pulls options out correctly on accepts | |
53 | * Alan Cox : Fixed assorted sk->rqueue->next errors | |
54 | * Alan Cox : PSH doesn't end a TCP read. Switched a | |
55 | * bit to skb ops. | |
56 | * Alan Cox : Tidied tcp_data to avoid a potential | |
57 | * nasty. | |
58 | * Alan Cox : Added some better commenting, as the | |
59 | * tcp is hard to follow | |
60 | * Alan Cox : Removed incorrect check for 20 * psh | |
61 | * Michael O'Reilly : ack < copied bug fix. | |
62 | * Johannes Stille : Misc tcp fixes (not all in yet). | |
63 | * Alan Cox : FIN with no memory -> CRASH | |
64 | * Alan Cox : Added socket option proto entries. | |
65 | * Also added awareness of them to accept. | |
66 | * Alan Cox : Added TCP options (SOL_TCP) | |
67 | * Alan Cox : Switched wakeup calls to callbacks, | |
68 | * so the kernel can layer network | |
69 | * sockets. | |
70 | * Alan Cox : Use ip_tos/ip_ttl settings. | |
71 | * Alan Cox : Handle FIN (more) properly (we hope). | |
72 | * Alan Cox : RST frames sent on unsynchronised | |
73 | * state ack error. | |
74 | * Alan Cox : Put in missing check for SYN bit. | |
75 | * Alan Cox : Added tcp_select_window() aka NET2E | |
76 | * window non shrink trick. | |
77 | * Alan Cox : Added a couple of small NET2E timer | |
78 | * fixes | |
79 | * Charles Hedrick : TCP fixes | |
80 | * Toomas Tamm : TCP window fixes | |
81 | * Alan Cox : Small URG fix to rlogin ^C ack fight | |
82 | * Charles Hedrick : Rewrote most of it to actually work | |
83 | * Linus : Rewrote tcp_read() and URG handling | |
84 | * completely | |
85 | * Gerhard Koerting: Fixed some missing timer handling | |
86 | * Matthew Dillon : Reworked TCP machine states as per RFC | |
87 | * Gerhard Koerting: PC/TCP workarounds | |
88 | * Adam Caldwell : Assorted timer/timing errors | |
89 | * Matthew Dillon : Fixed another RST bug | |
90 | * Alan Cox : Move to kernel side addressing changes. | |
91 | * Alan Cox : Beginning work on TCP fastpathing | |
92 | * (not yet usable) | |
93 | * Arnt Gulbrandsen: Turbocharged tcp_check() routine. | |
94 | * Alan Cox : TCP fast path debugging | |
95 | * Alan Cox : Window clamping | |
96 | * Michael Riepe : Bug in tcp_check() | |
97 | * Matt Dillon : More TCP improvements and RST bug fixes | |
98 | * Matt Dillon : Yet more small nasties remove from the | |
99 | * TCP code (Be very nice to this man if | |
100 | * tcp finally works 100%) 8) | |
101 | * Alan Cox : BSD accept semantics. | |
102 | * Alan Cox : Reset on closedown bug. | |
103 | * Peter De Schrijver : ENOTCONN check missing in tcp_sendto(). | |
104 | * Michael Pall : Handle poll() after URG properly in | |
105 | * all cases. | |
106 | * Michael Pall : Undo the last fix in tcp_read_urg() | |
107 | * (multi URG PUSH broke rlogin). | |
108 | * Michael Pall : Fix the multi URG PUSH problem in | |
109 | * tcp_readable(), poll() after URG | |
110 | * works now. | |
111 | * Michael Pall : recv(...,MSG_OOB) never blocks in the | |
112 | * BSD api. | |
113 | * Alan Cox : Changed the semantics of sk->socket to | |
114 | * fix a race and a signal problem with | |
115 | * accept() and async I/O. | |
116 | * Alan Cox : Relaxed the rules on tcp_sendto(). | |
117 | * Yury Shevchuk : Really fixed accept() blocking problem. | |
118 | * Craig I. Hagan : Allow for BSD compatible TIME_WAIT for | |
119 | * clients/servers which listen in on | |
120 | * fixed ports. | |
121 | * Alan Cox : Cleaned the above up and shrank it to | |
122 | * a sensible code size. | |
123 | * Alan Cox : Self connect lockup fix. | |
124 | * Alan Cox : No connect to multicast. | |
125 | * Ross Biro : Close unaccepted children on master | |
126 | * socket close. | |
127 | * Alan Cox : Reset tracing code. | |
128 | * Alan Cox : Spurious resets on shutdown. | |
129 | * Alan Cox : Giant 15 minute/60 second timer error | |
130 | * Alan Cox : Small whoops in polling before an | |
131 | * accept. | |
132 | * Alan Cox : Kept the state trace facility since | |
133 | * it's handy for debugging. | |
134 | * Alan Cox : More reset handler fixes. | |
135 | * Alan Cox : Started rewriting the code based on | |
136 | * the RFC's for other useful protocol | |
137 | * references see: Comer, KA9Q NOS, and | |
138 | * for a reference on the difference | |
139 | * between specifications and how BSD | |
140 | * works see the 4.4lite source. | |
141 | * A.N.Kuznetsov : Don't time wait on completion of tidy | |
142 | * close. | |
143 | * Linus Torvalds : Fin/Shutdown & copied_seq changes. | |
144 | * Linus Torvalds : Fixed BSD port reuse to work first syn | |
145 | * Alan Cox : Reimplemented timers as per the RFC | |
146 | * and using multiple timers for sanity. | |
147 | * Alan Cox : Small bug fixes, and a lot of new | |
148 | * comments. | |
149 | * Alan Cox : Fixed dual reader crash by locking | |
150 | * the buffers (much like datagram.c) | |
151 | * Alan Cox : Fixed stuck sockets in probe. A probe | |
152 | * now gets fed up of retrying without | |
153 | * (even a no space) answer. | |
154 | * Alan Cox : Extracted closing code better | |
155 | * Alan Cox : Fixed the closing state machine to | |
156 | * resemble the RFC. | |
157 | * Alan Cox : More 'per spec' fixes. | |
158 | * Jorge Cwik : Even faster checksumming. | |
159 | * Alan Cox : tcp_data() doesn't ack illegal PSH | |
160 | * only frames. At least one pc tcp stack | |
161 | * generates them. | |
162 | * Alan Cox : Cache last socket. | |
163 | * Alan Cox : Per route irtt. | |
164 | * Matt Day : poll()->select() match BSD precisely on error | |
165 | * Alan Cox : New buffers | |
166 | * Marc Tamsky : Various sk->prot->retransmits and | |
167 | * sk->retransmits misupdating fixed. | |
168 | * Fixed tcp_write_timeout: stuck close, | |
169 | * and TCP syn retries gets used now. | |
170 | * Mark Yarvis : In tcp_read_wakeup(), don't send an | |
171 | * ack if state is TCP_CLOSED. | |
172 | * Alan Cox : Look up device on a retransmit - routes may | |
173 | * change. Doesn't yet cope with MSS shrink right | |
174 | * but it's a start! | |
175 | * Marc Tamsky : Closing in closing fixes. | |
176 | * Mike Shaver : RFC1122 verifications. | |
177 | * Alan Cox : rcv_saddr errors. | |
178 | * Alan Cox : Block double connect(). | |
179 | * Alan Cox : Small hooks for enSKIP. | |
180 | * Alexey Kuznetsov: Path MTU discovery. | |
181 | * Alan Cox : Support soft errors. | |
182 | * Alan Cox : Fix MTU discovery pathological case | |
183 | * when the remote claims no mtu! | |
184 | * Marc Tamsky : TCP_CLOSE fix. | |
185 | * Colin (G3TNE) : Send a reset on syn ack replies in | |
186 | * window but wrong (fixes NT lpd problems) | |
187 | * Pedro Roque : Better TCP window handling, delayed ack. | |
188 | * Joerg Reuter : No modification of locked buffers in | |
189 | * tcp_do_retransmit() | |
190 | * Eric Schenk : Changed receiver side silly window | |
191 | * avoidance algorithm to BSD style | |
192 | * algorithm. This doubles throughput | |
193 | * against machines running Solaris, | |
194 | * and seems to result in general | |
195 | * improvement. | |
196 | * Stefan Magdalinski : adjusted tcp_readable() to fix FIONREAD | |
197 | * Willy Konynenberg : Transparent proxying support. | |
198 | * Mike McLagan : Routing by source | |
199 | * Keith Owens : Do proper merging with partial SKB's in | |
200 | * tcp_do_sendmsg to avoid burstiness. | |
201 | * Eric Schenk : Fix fast close down bug with | |
202 | * shutdown() followed by close(). | |
203 | * Andi Kleen : Make poll agree with SIGIO | |
204 | * Salvatore Sanfilippo : Support SO_LINGER with linger == 1 and | |
205 | * lingertime == 0 (RFC 793 ABORT Call) | |
206 | * Hirokazu Takahashi : Use copy_from_user() instead of | |
207 | * csum_and_copy_from_user() if possible. | |
208 | * | |
1da177e4 LT |
209 | * Description of States: |
210 | * | |
211 | * TCP_SYN_SENT sent a connection request, waiting for ack | |
212 | * | |
213 | * TCP_SYN_RECV received a connection request, sent ack, | |
214 | * waiting for final ack in three-way handshake. | |
215 | * | |
216 | * TCP_ESTABLISHED connection established | |
217 | * | |
218 | * TCP_FIN_WAIT1 our side has shutdown, waiting to complete | |
219 | * transmission of remaining buffered data | |
220 | * | |
221 | * TCP_FIN_WAIT2 all buffered data sent, waiting for remote | |
222 | * to shutdown | |
223 | * | |
224 | * TCP_CLOSING both sides have shutdown but we still have | |
225 | * data we have to finish sending | |
226 | * | |
227 | * TCP_TIME_WAIT timeout to catch resent junk before entering | |
228 | * closed, can only be entered from FIN_WAIT2 | |
229 | * or CLOSING. Required because the other end | |
230 | * may not have gotten our last ACK causing it | |
231 | * to retransmit the data packet (which we ignore) | |
232 | * | |
233 | * TCP_CLOSE_WAIT remote side has shutdown and is waiting for | |
234 | * us to finish writing our data and to shutdown | |
235 | * (we have to close() to move on to LAST_ACK) | |
236 | * | |
237 | * TCP_LAST_ACK out side has shutdown after remote has | |
238 | * shutdown. There may still be data in our | |
239 | * buffer that we have to finish sending | |
240 | * | |
241 | * TCP_CLOSE socket is finished | |
242 | */ | |
243 | ||
afd46503 JP |
244 | #define pr_fmt(fmt) "TCP: " fmt |
245 | ||
cf80e0e4 | 246 | #include <crypto/hash.h> |
172589cc | 247 | #include <linux/kernel.h> |
1da177e4 LT |
248 | #include <linux/module.h> |
249 | #include <linux/types.h> | |
250 | #include <linux/fcntl.h> | |
251 | #include <linux/poll.h> | |
6e9250f5 | 252 | #include <linux/inet_diag.h> |
1da177e4 | 253 | #include <linux/init.h> |
1da177e4 | 254 | #include <linux/fs.h> |
9c55e01c | 255 | #include <linux/skbuff.h> |
81b23b4a | 256 | #include <linux/scatterlist.h> |
9c55e01c JA |
257 | #include <linux/splice.h> |
258 | #include <linux/net.h> | |
259 | #include <linux/socket.h> | |
1da177e4 | 260 | #include <linux/random.h> |
57c8a661 | 261 | #include <linux/memblock.h> |
57413ebc MS |
262 | #include <linux/highmem.h> |
263 | #include <linux/swap.h> | |
b8059ead | 264 | #include <linux/cache.h> |
f4c50d99 | 265 | #include <linux/err.h> |
da5c78c8 | 266 | #include <linux/time.h> |
5a0e3ad6 | 267 | #include <linux/slab.h> |
98aaa913 | 268 | #include <linux/errqueue.h> |
60e2a778 | 269 | #include <linux/static_key.h> |
1da177e4 LT |
270 | |
271 | #include <net/icmp.h> | |
cf60af03 | 272 | #include <net/inet_common.h> |
1da177e4 | 273 | #include <net/tcp.h> |
f870fa0b | 274 | #include <net/mptcp.h> |
1da177e4 LT |
275 | #include <net/xfrm.h> |
276 | #include <net/ip.h> | |
9c55e01c | 277 | #include <net/sock.h> |
1da177e4 | 278 | |
7c0f6ba6 | 279 | #include <linux/uaccess.h> |
1da177e4 | 280 | #include <asm/ioctls.h> |
076bb0c8 | 281 | #include <net/busy_poll.h> |
1da177e4 | 282 | |
dd24c001 | 283 | struct percpu_counter tcp_orphan_count; |
0a5578cf ACM |
284 | EXPORT_SYMBOL_GPL(tcp_orphan_count); |
285 | ||
a4fe34bf | 286 | long sysctl_tcp_mem[3] __read_mostly; |
a4fe34bf | 287 | EXPORT_SYMBOL(sysctl_tcp_mem); |
1da177e4 | 288 | |
8d987e5c | 289 | atomic_long_t tcp_memory_allocated; /* Current allocated memory. */ |
1da177e4 | 290 | EXPORT_SYMBOL(tcp_memory_allocated); |
1748376b | 291 | |
60e2a778 UB |
292 | #if IS_ENABLED(CONFIG_SMC) |
293 | DEFINE_STATIC_KEY_FALSE(tcp_have_smc); | |
294 | EXPORT_SYMBOL(tcp_have_smc); | |
295 | #endif | |
296 | ||
1748376b ED |
297 | /* |
298 | * Current number of TCP sockets. | |
299 | */ | |
300 | struct percpu_counter tcp_sockets_allocated; | |
1da177e4 LT |
301 | EXPORT_SYMBOL(tcp_sockets_allocated); |
302 | ||
9c55e01c JA |
303 | /* |
304 | * TCP splice context | |
305 | */ | |
306 | struct tcp_splice_state { | |
307 | struct pipe_inode_info *pipe; | |
308 | size_t len; | |
309 | unsigned int flags; | |
310 | }; | |
311 | ||
1da177e4 LT |
312 | /* |
313 | * Pressure flag: try to collapse. | |
314 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 315 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
316 | * is strict, actions are advisory and have some latency. |
317 | */ | |
06044751 ED |
318 | unsigned long tcp_memory_pressure __read_mostly; |
319 | EXPORT_SYMBOL_GPL(tcp_memory_pressure); | |
1da177e4 | 320 | |
2e05fcae ED |
321 | DEFINE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key); |
322 | EXPORT_SYMBOL(tcp_rx_skb_cache_key); | |
323 | ||
324 | DEFINE_STATIC_KEY_FALSE(tcp_tx_skb_cache_key); | |
325 | ||
5c52ba17 | 326 | void tcp_enter_memory_pressure(struct sock *sk) |
1da177e4 | 327 | { |
06044751 ED |
328 | unsigned long val; |
329 | ||
1f142c17 | 330 | if (READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
331 | return; |
332 | val = jiffies; | |
333 | ||
334 | if (!val) | |
335 | val--; | |
336 | if (!cmpxchg(&tcp_memory_pressure, 0, val)) | |
4e673444 | 337 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES); |
1da177e4 | 338 | } |
06044751 ED |
339 | EXPORT_SYMBOL_GPL(tcp_enter_memory_pressure); |
340 | ||
341 | void tcp_leave_memory_pressure(struct sock *sk) | |
342 | { | |
343 | unsigned long val; | |
344 | ||
1f142c17 | 345 | if (!READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
346 | return; |
347 | val = xchg(&tcp_memory_pressure, 0); | |
348 | if (val) | |
349 | NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURESCHRONO, | |
350 | jiffies_to_msecs(jiffies - val)); | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(tcp_leave_memory_pressure); | |
1da177e4 | 353 | |
b103cf34 JA |
354 | /* Convert seconds to retransmits based on initial and max timeout */ |
355 | static u8 secs_to_retrans(int seconds, int timeout, int rto_max) | |
356 | { | |
357 | u8 res = 0; | |
358 | ||
359 | if (seconds > 0) { | |
360 | int period = timeout; | |
361 | ||
362 | res = 1; | |
363 | while (seconds > period && res < 255) { | |
364 | res++; | |
365 | timeout <<= 1; | |
366 | if (timeout > rto_max) | |
367 | timeout = rto_max; | |
368 | period += timeout; | |
369 | } | |
370 | } | |
371 | return res; | |
372 | } | |
373 | ||
374 | /* Convert retransmits to seconds based on initial and max timeout */ | |
375 | static int retrans_to_secs(u8 retrans, int timeout, int rto_max) | |
376 | { | |
377 | int period = 0; | |
378 | ||
379 | if (retrans > 0) { | |
380 | period = timeout; | |
381 | while (--retrans) { | |
382 | timeout <<= 1; | |
383 | if (timeout > rto_max) | |
384 | timeout = rto_max; | |
385 | period += timeout; | |
386 | } | |
387 | } | |
388 | return period; | |
389 | } | |
390 | ||
0263598c WW |
391 | static u64 tcp_compute_delivery_rate(const struct tcp_sock *tp) |
392 | { | |
393 | u32 rate = READ_ONCE(tp->rate_delivered); | |
394 | u32 intv = READ_ONCE(tp->rate_interval_us); | |
395 | u64 rate64 = 0; | |
396 | ||
397 | if (rate && intv) { | |
398 | rate64 = (u64)rate * tp->mss_cache * USEC_PER_SEC; | |
399 | do_div(rate64, intv); | |
400 | } | |
401 | return rate64; | |
402 | } | |
403 | ||
900f65d3 NC |
404 | /* Address-family independent initialization for a tcp_sock. |
405 | * | |
406 | * NOTE: A lot of things set to zero explicitly by call to | |
407 | * sk_alloc() so need not be done here. | |
408 | */ | |
409 | void tcp_init_sock(struct sock *sk) | |
410 | { | |
411 | struct inet_connection_sock *icsk = inet_csk(sk); | |
412 | struct tcp_sock *tp = tcp_sk(sk); | |
413 | ||
9f5afeae | 414 | tp->out_of_order_queue = RB_ROOT; |
75c119af | 415 | sk->tcp_rtx_queue = RB_ROOT; |
900f65d3 | 416 | tcp_init_xmit_timers(sk); |
46d3ceab | 417 | INIT_LIST_HEAD(&tp->tsq_node); |
e2080072 | 418 | INIT_LIST_HEAD(&tp->tsorted_sent_queue); |
900f65d3 NC |
419 | |
420 | icsk->icsk_rto = TCP_TIMEOUT_INIT; | |
740b0f18 | 421 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
ac9517fc | 422 | minmax_reset(&tp->rtt_min, tcp_jiffies32, ~0U); |
900f65d3 NC |
423 | |
424 | /* So many TCP implementations out there (incorrectly) count the | |
425 | * initial SYN frame in their delayed-ACK and congestion control | |
426 | * algorithms that we must have the following bandaid to talk | |
427 | * efficiently to them. -DaveM | |
428 | */ | |
429 | tp->snd_cwnd = TCP_INIT_CWND; | |
430 | ||
d7722e85 SHY |
431 | /* There's a bubble in the pipe until at least the first ACK. */ |
432 | tp->app_limited = ~0U; | |
433 | ||
900f65d3 NC |
434 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
435 | * initialization of these values. | |
436 | */ | |
437 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
438 | tp->snd_cwnd_clamp = ~0; | |
439 | tp->mss_cache = TCP_MSS_DEFAULT; | |
440 | ||
1043e25f | 441 | tp->reordering = sock_net(sk)->ipv4.sysctl_tcp_reordering; |
55d8694f | 442 | tcp_assign_congestion_control(sk); |
900f65d3 | 443 | |
ceaa1fef | 444 | tp->tsoffset = 0; |
1f255691 | 445 | tp->rack.reo_wnd_steps = 1; |
ceaa1fef | 446 | |
900f65d3 NC |
447 | sk->sk_write_space = sk_stream_write_space; |
448 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
449 | ||
450 | icsk->icsk_sync_mss = tcp_sync_mss; | |
451 | ||
e292f05e | 452 | WRITE_ONCE(sk->sk_sndbuf, sock_net(sk)->ipv4.sysctl_tcp_wmem[1]); |
ebb3b78d | 453 | WRITE_ONCE(sk->sk_rcvbuf, sock_net(sk)->ipv4.sysctl_tcp_rmem[1]); |
900f65d3 | 454 | |
900f65d3 | 455 | sk_sockets_allocated_inc(sk); |
0a6b2a1d | 456 | sk->sk_route_forced_caps = NETIF_F_GSO; |
900f65d3 NC |
457 | } |
458 | EXPORT_SYMBOL(tcp_init_sock); | |
459 | ||
4e8cc228 | 460 | static void tcp_tx_timestamp(struct sock *sk, u16 tsflags) |
4ed2d765 | 461 | { |
4e8cc228 ED |
462 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
463 | ||
ad02c4f5 | 464 | if (tsflags && skb) { |
f066e2b0 | 465 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
6b084928 | 466 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
4ed2d765 | 467 | |
c14ac945 | 468 | sock_tx_timestamp(sk, tsflags, &shinfo->tx_flags); |
0a2cf20c SHY |
469 | if (tsflags & SOF_TIMESTAMPING_TX_ACK) |
470 | tcb->txstamp_ack = 1; | |
471 | if (tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) | |
f066e2b0 WB |
472 | shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1; |
473 | } | |
4ed2d765 WB |
474 | } |
475 | ||
8934ce2f JF |
476 | static inline bool tcp_stream_is_readable(const struct tcp_sock *tp, |
477 | int target, struct sock *sk) | |
478 | { | |
24adbc16 ED |
479 | int avail = READ_ONCE(tp->rcv_nxt) - READ_ONCE(tp->copied_seq); |
480 | ||
481 | if (avail > 0) { | |
482 | if (avail >= target) | |
483 | return true; | |
484 | if (tcp_rmem_pressure(sk)) | |
485 | return true; | |
486 | } | |
487 | if (sk->sk_prot->stream_memory_read) | |
488 | return sk->sk_prot->stream_memory_read(sk); | |
489 | return false; | |
8934ce2f JF |
490 | } |
491 | ||
1da177e4 | 492 | /* |
a11e1d43 LT |
493 | * Wait for a TCP event. |
494 | * | |
495 | * Note that we don't need to lock the socket, as the upper poll layers | |
496 | * take care of normal races (between the test and the event) and we don't | |
497 | * go look at any of the socket buffers directly. | |
1da177e4 | 498 | */ |
a11e1d43 | 499 | __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 | 500 | { |
a11e1d43 | 501 | __poll_t mask; |
1da177e4 | 502 | struct sock *sk = sock->sk; |
cf533ea5 | 503 | const struct tcp_sock *tp = tcp_sk(sk); |
00fd38d9 | 504 | int state; |
1da177e4 | 505 | |
89ab066d | 506 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 507 | |
986ffdfd | 508 | state = inet_sk_state_load(sk); |
00fd38d9 | 509 | if (state == TCP_LISTEN) |
dc40c7bc | 510 | return inet_csk_listen_poll(sk); |
1da177e4 | 511 | |
a11e1d43 LT |
512 | /* Socket is not locked. We are protected from async events |
513 | * by poll logic and correct handling of state changes | |
514 | * made by other threads is impossible in any case. | |
515 | */ | |
516 | ||
517 | mask = 0; | |
518 | ||
1da177e4 | 519 | /* |
a9a08845 | 520 | * EPOLLHUP is certainly not done right. But poll() doesn't |
1da177e4 LT |
521 | * have a notion of HUP in just one direction, and for a |
522 | * socket the read side is more interesting. | |
523 | * | |
a9a08845 LT |
524 | * Some poll() documentation says that EPOLLHUP is incompatible |
525 | * with the EPOLLOUT/POLLWR flags, so somebody should check this | |
1da177e4 LT |
526 | * all. But careful, it tends to be safer to return too many |
527 | * bits than too few, and you can easily break real applications | |
528 | * if you don't tell them that something has hung up! | |
529 | * | |
530 | * Check-me. | |
531 | * | |
a9a08845 | 532 | * Check number 1. EPOLLHUP is _UNMASKABLE_ event (see UNIX98 and |
1da177e4 LT |
533 | * our fs/select.c). It means that after we received EOF, |
534 | * poll always returns immediately, making impossible poll() on write() | |
a9a08845 | 535 | * in state CLOSE_WAIT. One solution is evident --- to set EPOLLHUP |
1da177e4 LT |
536 | * if and only if shutdown has been made in both directions. |
537 | * Actually, it is interesting to look how Solaris and DUX | |
a9a08845 | 538 | * solve this dilemma. I would prefer, if EPOLLHUP were maskable, |
1da177e4 LT |
539 | * then we could set it on SND_SHUTDOWN. BTW examples given |
540 | * in Stevens' books assume exactly this behaviour, it explains | |
a9a08845 | 541 | * why EPOLLHUP is incompatible with EPOLLOUT. --ANK |
1da177e4 LT |
542 | * |
543 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent | |
544 | * blocking on fresh not-connected or disconnected socket. --ANK | |
545 | */ | |
00fd38d9 | 546 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
a9a08845 | 547 | mask |= EPOLLHUP; |
1da177e4 | 548 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 549 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
1da177e4 | 550 | |
8336886f | 551 | /* Connected or passive Fast Open socket? */ |
00fd38d9 | 552 | if (state != TCP_SYN_SENT && |
d983ea6f | 553 | (state != TCP_SYN_RECV || rcu_access_pointer(tp->fastopen_rsk))) { |
c7004482 DM |
554 | int target = sock_rcvlowat(sk, 0, INT_MAX); |
555 | ||
d9b55bf7 | 556 | if (READ_ONCE(tp->urg_seq) == READ_ONCE(tp->copied_seq) && |
c7004482 DM |
557 | !sock_flag(sk, SOCK_URGINLINE) && |
558 | tp->urg_data) | |
b634f875 | 559 | target++; |
c7004482 | 560 | |
8934ce2f | 561 | if (tcp_stream_is_readable(tp, target, sk)) |
a9a08845 | 562 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
563 | |
564 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
64dc6130 | 565 | if (sk_stream_is_writeable(sk)) { |
a9a08845 | 566 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 567 | } else { /* send SIGIO later */ |
9cd3e072 | 568 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
569 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
570 | ||
571 | /* Race breaker. If space is freed after | |
572 | * wspace test but before the flags are set, | |
3c715127 | 573 | * IO signal will be lost. Memory barrier |
574 | * pairs with the input side. | |
1da177e4 | 575 | */ |
3c715127 | 576 | smp_mb__after_atomic(); |
64dc6130 | 577 | if (sk_stream_is_writeable(sk)) |
a9a08845 | 578 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 579 | } |
d84ba638 | 580 | } else |
a9a08845 | 581 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 LT |
582 | |
583 | if (tp->urg_data & TCP_URG_VALID) | |
a9a08845 | 584 | mask |= EPOLLPRI; |
d68be71e | 585 | } else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) { |
19f6d3f3 | 586 | /* Active TCP fastopen socket with defer_connect |
a9a08845 | 587 | * Return EPOLLOUT so application can call write() |
19f6d3f3 WW |
588 | * in order for kernel to generate SYN+data |
589 | */ | |
a9a08845 | 590 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 591 | } |
a4d25803 TM |
592 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
593 | smp_rmb(); | |
3ef7cf57 | 594 | if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue)) |
a9a08845 | 595 | mask |= EPOLLERR; |
a4d25803 | 596 | |
1da177e4 LT |
597 | return mask; |
598 | } | |
a11e1d43 | 599 | EXPORT_SYMBOL(tcp_poll); |
1da177e4 LT |
600 | |
601 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
602 | { | |
603 | struct tcp_sock *tp = tcp_sk(sk); | |
604 | int answ; | |
0e71c55c | 605 | bool slow; |
1da177e4 LT |
606 | |
607 | switch (cmd) { | |
608 | case SIOCINQ: | |
609 | if (sk->sk_state == TCP_LISTEN) | |
610 | return -EINVAL; | |
611 | ||
0e71c55c | 612 | slow = lock_sock_fast(sk); |
473bd239 | 613 | answ = tcp_inq(sk); |
0e71c55c | 614 | unlock_sock_fast(sk, slow); |
1da177e4 LT |
615 | break; |
616 | case SIOCATMARK: | |
d9b55bf7 ED |
617 | answ = tp->urg_data && |
618 | READ_ONCE(tp->urg_seq) == READ_ONCE(tp->copied_seq); | |
1da177e4 LT |
619 | break; |
620 | case SIOCOUTQ: | |
621 | if (sk->sk_state == TCP_LISTEN) | |
622 | return -EINVAL; | |
623 | ||
624 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
625 | answ = 0; | |
626 | else | |
0f317464 | 627 | answ = READ_ONCE(tp->write_seq) - tp->snd_una; |
1da177e4 | 628 | break; |
2f4e1b39 MS |
629 | case SIOCOUTQNSD: |
630 | if (sk->sk_state == TCP_LISTEN) | |
631 | return -EINVAL; | |
632 | ||
633 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
634 | answ = 0; | |
635 | else | |
e0d694d6 ED |
636 | answ = READ_ONCE(tp->write_seq) - |
637 | READ_ONCE(tp->snd_nxt); | |
2f4e1b39 | 638 | break; |
1da177e4 LT |
639 | default: |
640 | return -ENOIOCTLCMD; | |
3ff50b79 | 641 | } |
1da177e4 LT |
642 | |
643 | return put_user(answ, (int __user *)arg); | |
644 | } | |
4bc2f18b | 645 | EXPORT_SYMBOL(tcp_ioctl); |
1da177e4 | 646 | |
1da177e4 LT |
647 | static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
648 | { | |
4de075e0 | 649 | TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; |
1da177e4 LT |
650 | tp->pushed_seq = tp->write_seq; |
651 | } | |
652 | ||
a2a385d6 | 653 | static inline bool forced_push(const struct tcp_sock *tp) |
1da177e4 LT |
654 | { |
655 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); | |
656 | } | |
657 | ||
f4a775d1 | 658 | static void skb_entail(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 659 | { |
9e412ba7 | 660 | struct tcp_sock *tp = tcp_sk(sk); |
352d4800 ACM |
661 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
662 | ||
663 | skb->csum = 0; | |
664 | tcb->seq = tcb->end_seq = tp->write_seq; | |
4de075e0 | 665 | tcb->tcp_flags = TCPHDR_ACK; |
352d4800 | 666 | tcb->sacked = 0; |
f4a775d1 | 667 | __skb_header_release(skb); |
fe067e8a | 668 | tcp_add_write_queue_tail(sk, skb); |
ab4e846a | 669 | sk_wmem_queued_add(sk, skb->truesize); |
3ab224be | 670 | sk_mem_charge(sk, skb->truesize); |
89ebd197 | 671 | if (tp->nonagle & TCP_NAGLE_PUSH) |
e905a9ed | 672 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
6f021c62 ED |
673 | |
674 | tcp_slow_start_after_idle_check(sk); | |
1da177e4 LT |
675 | } |
676 | ||
afeca340 | 677 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags) |
1da177e4 | 678 | { |
33f5f57e | 679 | if (flags & MSG_OOB) |
1da177e4 | 680 | tp->snd_up = tp->write_seq; |
1da177e4 LT |
681 | } |
682 | ||
f54b3111 | 683 | /* If a not yet filled skb is pushed, do not send it if |
a181ceb5 | 684 | * we have data packets in Qdisc or NIC queues : |
f54b3111 ED |
685 | * Because TX completion will happen shortly, it gives a chance |
686 | * to coalesce future sendmsg() payload into this skb, without | |
687 | * need for a timer, and with no latency trade off. | |
688 | * As packets containing data payload have a bigger truesize | |
a181ceb5 ED |
689 | * than pure acks (dataless) packets, the last checks prevent |
690 | * autocorking if we only have an ACK in Qdisc/NIC queues, | |
691 | * or if TX completion was delayed after we processed ACK packet. | |
f54b3111 ED |
692 | */ |
693 | static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb, | |
694 | int size_goal) | |
1da177e4 | 695 | { |
f54b3111 | 696 | return skb->len < size_goal && |
790f00e1 | 697 | sock_net(sk)->ipv4.sysctl_tcp_autocorking && |
114f39fe | 698 | !tcp_rtx_queue_empty(sk) && |
14afee4b | 699 | refcount_read(&sk->sk_wmem_alloc) > skb->truesize; |
f54b3111 ED |
700 | } |
701 | ||
35b2c321 MM |
702 | void tcp_push(struct sock *sk, int flags, int mss_now, |
703 | int nonagle, int size_goal) | |
f54b3111 ED |
704 | { |
705 | struct tcp_sock *tp = tcp_sk(sk); | |
706 | struct sk_buff *skb; | |
afeca340 | 707 | |
f54b3111 | 708 | skb = tcp_write_queue_tail(sk); |
75c119af ED |
709 | if (!skb) |
710 | return; | |
f54b3111 ED |
711 | if (!(flags & MSG_MORE) || forced_push(tp)) |
712 | tcp_mark_push(tp, skb); | |
713 | ||
714 | tcp_mark_urg(tp, flags); | |
715 | ||
716 | if (tcp_should_autocork(sk, skb, size_goal)) { | |
717 | ||
718 | /* avoid atomic op if TSQ_THROTTLED bit is already set */ | |
7aa5470c | 719 | if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) { |
f54b3111 | 720 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING); |
7aa5470c | 721 | set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags); |
f54b3111 | 722 | } |
a181ceb5 ED |
723 | /* It is possible TX completion already happened |
724 | * before we set TSQ_THROTTLED. | |
725 | */ | |
14afee4b | 726 | if (refcount_read(&sk->sk_wmem_alloc) > skb->truesize) |
a181ceb5 | 727 | return; |
1da177e4 | 728 | } |
f54b3111 ED |
729 | |
730 | if (flags & MSG_MORE) | |
731 | nonagle = TCP_NAGLE_CORK; | |
732 | ||
733 | __tcp_push_pending_frames(sk, mss_now, nonagle); | |
1da177e4 LT |
734 | } |
735 | ||
6ff7751d AB |
736 | static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
737 | unsigned int offset, size_t len) | |
9c55e01c JA |
738 | { |
739 | struct tcp_splice_state *tss = rd_desc->arg.data; | |
33966dd0 | 740 | int ret; |
9c55e01c | 741 | |
a60e3cc7 | 742 | ret = skb_splice_bits(skb, skb->sk, offset, tss->pipe, |
25869262 | 743 | min(rd_desc->count, len), tss->flags); |
33966dd0 WT |
744 | if (ret > 0) |
745 | rd_desc->count -= ret; | |
746 | return ret; | |
9c55e01c JA |
747 | } |
748 | ||
749 | static int __tcp_splice_read(struct sock *sk, struct tcp_splice_state *tss) | |
750 | { | |
751 | /* Store TCP splice context information in read_descriptor_t. */ | |
752 | read_descriptor_t rd_desc = { | |
753 | .arg.data = tss, | |
33966dd0 | 754 | .count = tss->len, |
9c55e01c JA |
755 | }; |
756 | ||
757 | return tcp_read_sock(sk, &rd_desc, tcp_splice_data_recv); | |
758 | } | |
759 | ||
760 | /** | |
761 | * tcp_splice_read - splice data from TCP socket to a pipe | |
762 | * @sock: socket to splice from | |
763 | * @ppos: position (not valid) | |
764 | * @pipe: pipe to splice to | |
765 | * @len: number of bytes to splice | |
766 | * @flags: splice modifier flags | |
767 | * | |
768 | * Description: | |
769 | * Will read pages from given socket and fill them into a pipe. | |
770 | * | |
771 | **/ | |
772 | ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos, | |
773 | struct pipe_inode_info *pipe, size_t len, | |
774 | unsigned int flags) | |
775 | { | |
776 | struct sock *sk = sock->sk; | |
777 | struct tcp_splice_state tss = { | |
778 | .pipe = pipe, | |
779 | .len = len, | |
780 | .flags = flags, | |
781 | }; | |
782 | long timeo; | |
783 | ssize_t spliced; | |
784 | int ret; | |
785 | ||
3a047bf8 | 786 | sock_rps_record_flow(sk); |
9c55e01c JA |
787 | /* |
788 | * We can't seek on a socket input | |
789 | */ | |
790 | if (unlikely(*ppos)) | |
791 | return -ESPIPE; | |
792 | ||
793 | ret = spliced = 0; | |
794 | ||
795 | lock_sock(sk); | |
796 | ||
42324c62 | 797 | timeo = sock_rcvtimeo(sk, sock->file->f_flags & O_NONBLOCK); |
9c55e01c JA |
798 | while (tss.len) { |
799 | ret = __tcp_splice_read(sk, &tss); | |
800 | if (ret < 0) | |
801 | break; | |
802 | else if (!ret) { | |
803 | if (spliced) | |
804 | break; | |
9c55e01c JA |
805 | if (sock_flag(sk, SOCK_DONE)) |
806 | break; | |
807 | if (sk->sk_err) { | |
808 | ret = sock_error(sk); | |
809 | break; | |
810 | } | |
811 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
812 | break; | |
813 | if (sk->sk_state == TCP_CLOSE) { | |
814 | /* | |
815 | * This occurs when user tries to read | |
816 | * from never connected socket. | |
817 | */ | |
c47078d6 | 818 | ret = -ENOTCONN; |
9c55e01c JA |
819 | break; |
820 | } | |
821 | if (!timeo) { | |
822 | ret = -EAGAIN; | |
823 | break; | |
824 | } | |
ccf7abb9 ED |
825 | /* if __tcp_splice_read() got nothing while we have |
826 | * an skb in receive queue, we do not want to loop. | |
827 | * This might happen with URG data. | |
828 | */ | |
829 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
830 | break; | |
dfbafc99 | 831 | sk_wait_data(sk, &timeo, NULL); |
9c55e01c JA |
832 | if (signal_pending(current)) { |
833 | ret = sock_intr_errno(timeo); | |
834 | break; | |
835 | } | |
836 | continue; | |
837 | } | |
838 | tss.len -= ret; | |
839 | spliced += ret; | |
840 | ||
33966dd0 WT |
841 | if (!timeo) |
842 | break; | |
9c55e01c JA |
843 | release_sock(sk); |
844 | lock_sock(sk); | |
845 | ||
846 | if (sk->sk_err || sk->sk_state == TCP_CLOSE || | |
33966dd0 | 847 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
9c55e01c JA |
848 | signal_pending(current)) |
849 | break; | |
850 | } | |
851 | ||
852 | release_sock(sk); | |
853 | ||
854 | if (spliced) | |
855 | return spliced; | |
856 | ||
857 | return ret; | |
858 | } | |
4bc2f18b | 859 | EXPORT_SYMBOL(tcp_splice_read); |
9c55e01c | 860 | |
eb934478 ED |
861 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
862 | bool force_schedule) | |
f561d0f2 PE |
863 | { |
864 | struct sk_buff *skb; | |
865 | ||
4f661542 ED |
866 | if (likely(!size)) { |
867 | skb = sk->sk_tx_skb_cache; | |
858f5017 | 868 | if (skb) { |
d7cc399e | 869 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
472c2e07 ED |
870 | sk->sk_tx_skb_cache = NULL; |
871 | pskb_trim(skb, 0); | |
872 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); | |
eb70a1ae ED |
873 | skb_shinfo(skb)->tx_flags = 0; |
874 | memset(TCP_SKB_CB(skb), 0, sizeof(struct tcp_skb_cb)); | |
472c2e07 ED |
875 | return skb; |
876 | } | |
877 | } | |
f561d0f2 PE |
878 | /* The TCP header must be at least 32-bit aligned. */ |
879 | size = ALIGN(size, 4); | |
880 | ||
8e4d980a ED |
881 | if (unlikely(tcp_under_memory_pressure(sk))) |
882 | sk_mem_reclaim_partial(sk); | |
883 | ||
f561d0f2 | 884 | skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp); |
8e4d980a | 885 | if (likely(skb)) { |
eb934478 | 886 | bool mem_scheduled; |
8e4d980a | 887 | |
eb934478 ED |
888 | if (force_schedule) { |
889 | mem_scheduled = true; | |
8e4d980a ED |
890 | sk_forced_mem_schedule(sk, skb->truesize); |
891 | } else { | |
eb934478 | 892 | mem_scheduled = sk_wmem_schedule(sk, skb->truesize); |
8e4d980a | 893 | } |
eb934478 | 894 | if (likely(mem_scheduled)) { |
a21d4572 | 895 | skb_reserve(skb, sk->sk_prot->max_header); |
f561d0f2 PE |
896 | /* |
897 | * Make sure that we have exactly size bytes | |
898 | * available to the caller, no more, no less. | |
899 | */ | |
16fad69c | 900 | skb->reserved_tailroom = skb->end - skb->tail - size; |
e2080072 | 901 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); |
f561d0f2 PE |
902 | return skb; |
903 | } | |
904 | __kfree_skb(skb); | |
905 | } else { | |
5c52ba17 | 906 | sk->sk_prot->enter_memory_pressure(sk); |
f561d0f2 PE |
907 | sk_stream_moderate_sndbuf(sk); |
908 | } | |
909 | return NULL; | |
910 | } | |
911 | ||
0c54b85f IJ |
912 | static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, |
913 | int large_allowed) | |
914 | { | |
915 | struct tcp_sock *tp = tcp_sk(sk); | |
6c09fa09 | 916 | u32 new_size_goal, size_goal; |
605ad7f1 | 917 | |
74d4a8f8 | 918 | if (!large_allowed) |
605ad7f1 ED |
919 | return mss_now; |
920 | ||
6c09fa09 ED |
921 | /* Note : tcp_tso_autosize() will eventually split this later */ |
922 | new_size_goal = sk->sk_gso_max_size - 1 - MAX_TCP_HEADER; | |
605ad7f1 ED |
923 | new_size_goal = tcp_bound_to_half_wnd(tp, new_size_goal); |
924 | ||
925 | /* We try hard to avoid divides here */ | |
926 | size_goal = tp->gso_segs * mss_now; | |
927 | if (unlikely(new_size_goal < size_goal || | |
928 | new_size_goal >= size_goal + mss_now)) { | |
929 | tp->gso_segs = min_t(u16, new_size_goal / mss_now, | |
930 | sk->sk_gso_max_segs); | |
931 | size_goal = tp->gso_segs * mss_now; | |
0c54b85f IJ |
932 | } |
933 | ||
605ad7f1 | 934 | return max(size_goal, mss_now); |
0c54b85f IJ |
935 | } |
936 | ||
35b2c321 | 937 | int tcp_send_mss(struct sock *sk, int *size_goal, int flags) |
0c54b85f IJ |
938 | { |
939 | int mss_now; | |
940 | ||
941 | mss_now = tcp_current_mss(sk); | |
942 | *size_goal = tcp_xmit_size_goal(sk, mss_now, !(flags & MSG_OOB)); | |
943 | ||
944 | return mss_now; | |
945 | } | |
946 | ||
fdfc5c85 ED |
947 | /* In some cases, both sendpage() and sendmsg() could have added |
948 | * an skb to the write queue, but failed adding payload on it. | |
949 | * We need to remove it to consume less memory, but more | |
950 | * importantly be able to generate EPOLLOUT for Edge Trigger epoll() | |
951 | * users. | |
952 | */ | |
953 | static void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb) | |
954 | { | |
955 | if (skb && !skb->len) { | |
956 | tcp_unlink_write_queue(skb, sk); | |
957 | if (tcp_write_queue_empty(sk)) | |
958 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
959 | sk_wmem_free_skb(sk, skb); | |
960 | } | |
961 | } | |
962 | ||
e3b5616a DW |
963 | ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, |
964 | size_t size, int flags) | |
1da177e4 LT |
965 | { |
966 | struct tcp_sock *tp = tcp_sk(sk); | |
c1b4a7e6 | 967 | int mss_now, size_goal; |
1da177e4 LT |
968 | int err; |
969 | ssize_t copied; | |
970 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
971 | ||
a10674bf VA |
972 | if (IS_ENABLED(CONFIG_DEBUG_VM) && |
973 | WARN_ONCE(PageSlab(page), "page must not be a Slab one")) | |
974 | return -EINVAL; | |
975 | ||
8336886f JC |
976 | /* Wait for a connection to finish. One exception is TCP Fast Open |
977 | * (passive side) where data is allowed to be sent before a connection | |
978 | * is fully established. | |
979 | */ | |
980 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
981 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
982 | err = sk_stream_wait_connect(sk, &timeo); |
983 | if (err != 0) | |
1da177e4 | 984 | goto out_err; |
8336886f | 985 | } |
1da177e4 | 986 | |
9cd3e072 | 987 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 988 | |
0c54b85f | 989 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
990 | copied = 0; |
991 | ||
992 | err = -EPIPE; | |
993 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
0d6a775e | 994 | goto out_err; |
1da177e4 | 995 | |
64022d0b | 996 | while (size > 0) { |
fe067e8a | 997 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
38ba0a65 | 998 | int copy, i; |
38ba0a65 | 999 | bool can_coalesce; |
1da177e4 | 1000 | |
75c119af | 1001 | if (!skb || (copy = size_goal - skb->len) <= 0 || |
c134ecb8 | 1002 | !tcp_skb_can_collapse_to(skb)) { |
1da177e4 LT |
1003 | new_segment: |
1004 | if (!sk_stream_memory_free(sk)) | |
1005 | goto wait_for_sndbuf; | |
1006 | ||
eb934478 | 1007 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, |
75c119af | 1008 | tcp_rtx_and_write_queues_empty(sk)); |
1da177e4 LT |
1009 | if (!skb) |
1010 | goto wait_for_memory; | |
1011 | ||
41477662 JK |
1012 | #ifdef CONFIG_TLS_DEVICE |
1013 | skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED); | |
1014 | #endif | |
9e412ba7 | 1015 | skb_entail(sk, skb); |
c1b4a7e6 | 1016 | copy = size_goal; |
1da177e4 LT |
1017 | } |
1018 | ||
1019 | if (copy > size) | |
1020 | copy = size; | |
1021 | ||
1022 | i = skb_shinfo(skb)->nr_frags; | |
1023 | can_coalesce = skb_can_coalesce(skb, i, page, offset); | |
5f74f82e | 1024 | if (!can_coalesce && i >= sysctl_max_skb_frags) { |
1da177e4 LT |
1025 | tcp_mark_push(tp, skb); |
1026 | goto new_segment; | |
1027 | } | |
3ab224be | 1028 | if (!sk_wmem_schedule(sk, copy)) |
1da177e4 | 1029 | goto wait_for_memory; |
e905a9ed | 1030 | |
1da177e4 | 1031 | if (can_coalesce) { |
9e903e08 | 1032 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
1da177e4 LT |
1033 | } else { |
1034 | get_page(page); | |
1035 | skb_fill_page_desc(skb, i, page, offset, copy); | |
1036 | } | |
312fc2b4 JF |
1037 | |
1038 | if (!(flags & MSG_NO_SHARED_FRAGS)) | |
1039 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; | |
cef401de | 1040 | |
1da177e4 LT |
1041 | skb->len += copy; |
1042 | skb->data_len += copy; | |
1043 | skb->truesize += copy; | |
ab4e846a | 1044 | sk_wmem_queued_add(sk, copy); |
3ab224be | 1045 | sk_mem_charge(sk, copy); |
84fa7933 | 1046 | skb->ip_summed = CHECKSUM_PARTIAL; |
0f317464 | 1047 | WRITE_ONCE(tp->write_seq, tp->write_seq + copy); |
1da177e4 | 1048 | TCP_SKB_CB(skb)->end_seq += copy; |
cd7d8498 | 1049 | tcp_skb_pcount_set(skb, 0); |
1da177e4 LT |
1050 | |
1051 | if (!copied) | |
4de075e0 | 1052 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; |
1da177e4 LT |
1053 | |
1054 | copied += copy; | |
64022d0b | 1055 | offset += copy; |
686a5624 | 1056 | size -= copy; |
ad02c4f5 | 1057 | if (!size) |
1da177e4 LT |
1058 | goto out; |
1059 | ||
69d15067 | 1060 | if (skb->len < size_goal || (flags & MSG_OOB)) |
1da177e4 LT |
1061 | continue; |
1062 | ||
1063 | if (forced_push(tp)) { | |
1064 | tcp_mark_push(tp, skb); | |
9e412ba7 | 1065 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
fe067e8a | 1066 | } else if (skb == tcp_send_head(sk)) |
1da177e4 LT |
1067 | tcp_push_one(sk, mss_now); |
1068 | continue; | |
1069 | ||
1070 | wait_for_sndbuf: | |
1071 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1072 | wait_for_memory: | |
f54b3111 ED |
1073 | tcp_push(sk, flags & ~MSG_MORE, mss_now, |
1074 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1075 | |
686a5624 YM |
1076 | err = sk_stream_wait_memory(sk, &timeo); |
1077 | if (err != 0) | |
1da177e4 LT |
1078 | goto do_error; |
1079 | ||
0c54b85f | 1080 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | out: | |
ad02c4f5 | 1084 | if (copied) { |
4e8cc228 | 1085 | tcp_tx_timestamp(sk, sk->sk_tsflags); |
ad02c4f5 SHY |
1086 | if (!(flags & MSG_SENDPAGE_NOTLAST)) |
1087 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); | |
1088 | } | |
1da177e4 LT |
1089 | return copied; |
1090 | ||
1091 | do_error: | |
fdfc5c85 | 1092 | tcp_remove_empty_skb(sk, tcp_write_queue_tail(sk)); |
1da177e4 LT |
1093 | if (copied) |
1094 | goto out; | |
1095 | out_err: | |
ce5ec440 | 1096 | /* make sure we wake any epoll edge trigger waiter */ |
216808c6 | 1097 | if (unlikely(tcp_rtx_and_write_queues_empty(sk) && err == -EAGAIN)) { |
ce5ec440 | 1098 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1099 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1100 | } | |
1da177e4 LT |
1101 | return sk_stream_error(sk, flags, err); |
1102 | } | |
e3b5616a | 1103 | EXPORT_SYMBOL_GPL(do_tcp_sendpages); |
1da177e4 | 1104 | |
306b13eb TH |
1105 | int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, |
1106 | size_t size, int flags) | |
1da177e4 | 1107 | { |
dead7cdb | 1108 | if (!(sk->sk_route_caps & NETIF_F_SG)) |
bd9dfc54 | 1109 | return sock_no_sendpage_locked(sk, page, offset, size, flags); |
1da177e4 | 1110 | |
d7722e85 SHY |
1111 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1112 | ||
306b13eb TH |
1113 | return do_tcp_sendpages(sk, page, offset, size, flags); |
1114 | } | |
774c4673 | 1115 | EXPORT_SYMBOL_GPL(tcp_sendpage_locked); |
306b13eb TH |
1116 | |
1117 | int tcp_sendpage(struct sock *sk, struct page *page, int offset, | |
1118 | size_t size, int flags) | |
1119 | { | |
1120 | int ret; | |
1121 | ||
1122 | lock_sock(sk); | |
1123 | ret = tcp_sendpage_locked(sk, page, offset, size, flags); | |
1da177e4 | 1124 | release_sock(sk); |
306b13eb TH |
1125 | |
1126 | return ret; | |
1da177e4 | 1127 | } |
4bc2f18b | 1128 | EXPORT_SYMBOL(tcp_sendpage); |
1da177e4 | 1129 | |
cf60af03 YC |
1130 | void tcp_free_fastopen_req(struct tcp_sock *tp) |
1131 | { | |
00db4124 | 1132 | if (tp->fastopen_req) { |
cf60af03 YC |
1133 | kfree(tp->fastopen_req); |
1134 | tp->fastopen_req = NULL; | |
1135 | } | |
1136 | } | |
1137 | ||
f5ddcbbb | 1138 | static int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, |
f859a448 WB |
1139 | int *copied, size_t size, |
1140 | struct ubuf_info *uarg) | |
cf60af03 YC |
1141 | { |
1142 | struct tcp_sock *tp = tcp_sk(sk); | |
19f6d3f3 | 1143 | struct inet_sock *inet = inet_sk(sk); |
ba615f67 | 1144 | struct sockaddr *uaddr = msg->msg_name; |
cf60af03 YC |
1145 | int err, flags; |
1146 | ||
e1cfcbe8 | 1147 | if (!(sock_net(sk)->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) || |
ba615f67 WW |
1148 | (uaddr && msg->msg_namelen >= sizeof(uaddr->sa_family) && |
1149 | uaddr->sa_family == AF_UNSPEC)) | |
cf60af03 | 1150 | return -EOPNOTSUPP; |
00db4124 | 1151 | if (tp->fastopen_req) |
cf60af03 YC |
1152 | return -EALREADY; /* Another Fast Open is in progress */ |
1153 | ||
1154 | tp->fastopen_req = kzalloc(sizeof(struct tcp_fastopen_request), | |
1155 | sk->sk_allocation); | |
51456b29 | 1156 | if (unlikely(!tp->fastopen_req)) |
cf60af03 YC |
1157 | return -ENOBUFS; |
1158 | tp->fastopen_req->data = msg; | |
f5ddcbbb | 1159 | tp->fastopen_req->size = size; |
f859a448 | 1160 | tp->fastopen_req->uarg = uarg; |
cf60af03 | 1161 | |
19f6d3f3 WW |
1162 | if (inet->defer_connect) { |
1163 | err = tcp_connect(sk); | |
1164 | /* Same failure procedure as in tcp_v4/6_connect */ | |
1165 | if (err) { | |
1166 | tcp_set_state(sk, TCP_CLOSE); | |
1167 | inet->inet_dport = 0; | |
1168 | sk->sk_route_caps = 0; | |
1169 | } | |
1170 | } | |
cf60af03 | 1171 | flags = (msg->msg_flags & MSG_DONTWAIT) ? O_NONBLOCK : 0; |
ba615f67 | 1172 | err = __inet_stream_connect(sk->sk_socket, uaddr, |
3979ad7e | 1173 | msg->msg_namelen, flags, 1); |
7db92362 WW |
1174 | /* fastopen_req could already be freed in __inet_stream_connect |
1175 | * if the connection times out or gets rst | |
1176 | */ | |
1177 | if (tp->fastopen_req) { | |
1178 | *copied = tp->fastopen_req->copied; | |
1179 | tcp_free_fastopen_req(tp); | |
1180 | inet->defer_connect = 0; | |
1181 | } | |
cf60af03 YC |
1182 | return err; |
1183 | } | |
1184 | ||
306b13eb | 1185 | int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) |
1da177e4 | 1186 | { |
1da177e4 | 1187 | struct tcp_sock *tp = tcp_sk(sk); |
f214f915 | 1188 | struct ubuf_info *uarg = NULL; |
1da177e4 | 1189 | struct sk_buff *skb; |
c14ac945 | 1190 | struct sockcm_cookie sockc; |
57be5bda AV |
1191 | int flags, err, copied = 0; |
1192 | int mss_now = 0, size_goal, copied_syn = 0; | |
1a991488 | 1193 | int process_backlog = 0; |
74d4a8f8 | 1194 | bool zc = false; |
1da177e4 LT |
1195 | long timeo; |
1196 | ||
1da177e4 | 1197 | flags = msg->msg_flags; |
f214f915 | 1198 | |
5cf4a853 | 1199 | if (flags & MSG_ZEROCOPY && size && sock_flag(sk, SOCK_ZEROCOPY)) { |
75c119af | 1200 | skb = tcp_write_queue_tail(sk); |
f214f915 WB |
1201 | uarg = sock_zerocopy_realloc(sk, size, skb_zcopy(skb)); |
1202 | if (!uarg) { | |
1203 | err = -ENOBUFS; | |
1204 | goto out_err; | |
1205 | } | |
1206 | ||
dead7cdb | 1207 | zc = sk->sk_route_caps & NETIF_F_SG; |
02583ade | 1208 | if (!zc) |
f214f915 WB |
1209 | uarg->zerocopy = 0; |
1210 | } | |
1211 | ||
16ae6aa1 YC |
1212 | if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) && |
1213 | !tp->repair) { | |
f859a448 | 1214 | err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size, uarg); |
cf60af03 YC |
1215 | if (err == -EINPROGRESS && copied_syn > 0) |
1216 | goto out; | |
1217 | else if (err) | |
1218 | goto out_err; | |
cf60af03 YC |
1219 | } |
1220 | ||
1da177e4 LT |
1221 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
1222 | ||
d7722e85 SHY |
1223 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1224 | ||
8336886f JC |
1225 | /* Wait for a connection to finish. One exception is TCP Fast Open |
1226 | * (passive side) where data is allowed to be sent before a connection | |
1227 | * is fully established. | |
1228 | */ | |
1229 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
1230 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
1231 | err = sk_stream_wait_connect(sk, &timeo); |
1232 | if (err != 0) | |
cf60af03 | 1233 | goto do_error; |
8336886f | 1234 | } |
1da177e4 | 1235 | |
c0e88ff0 PE |
1236 | if (unlikely(tp->repair)) { |
1237 | if (tp->repair_queue == TCP_RECV_QUEUE) { | |
1238 | copied = tcp_send_rcvq(sk, msg, size); | |
5924f17a | 1239 | goto out_nopush; |
c0e88ff0 PE |
1240 | } |
1241 | ||
1242 | err = -EINVAL; | |
1243 | if (tp->repair_queue == TCP_NO_QUEUE) | |
1244 | goto out_err; | |
1245 | ||
1246 | /* 'common' sending to sendq */ | |
1247 | } | |
1248 | ||
657a0667 | 1249 | sockcm_init(&sockc, sk); |
c14ac945 SHY |
1250 | if (msg->msg_controllen) { |
1251 | err = sock_cmsg_send(sk, msg, &sockc); | |
1252 | if (unlikely(err)) { | |
1253 | err = -EINVAL; | |
1254 | goto out_err; | |
1255 | } | |
1256 | } | |
1257 | ||
1da177e4 | 1258 | /* This should be in poll */ |
9cd3e072 | 1259 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 1260 | |
1da177e4 | 1261 | /* Ok commence sending. */ |
1da177e4 LT |
1262 | copied = 0; |
1263 | ||
d41a69f1 ED |
1264 | restart: |
1265 | mss_now = tcp_send_mss(sk, &size_goal, flags); | |
1266 | ||
1da177e4 LT |
1267 | err = -EPIPE; |
1268 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
79d8665b | 1269 | goto do_error; |
1da177e4 | 1270 | |
01e97e65 | 1271 | while (msg_data_left(msg)) { |
57be5bda | 1272 | int copy = 0; |
1da177e4 | 1273 | |
57be5bda | 1274 | skb = tcp_write_queue_tail(sk); |
65ec6097 ED |
1275 | if (skb) |
1276 | copy = size_goal - skb->len; | |
1da177e4 | 1277 | |
c134ecb8 | 1278 | if (copy <= 0 || !tcp_skb_can_collapse_to(skb)) { |
3613b3db ED |
1279 | bool first_skb; |
1280 | ||
1da177e4 | 1281 | new_segment: |
57be5bda AV |
1282 | if (!sk_stream_memory_free(sk)) |
1283 | goto wait_for_sndbuf; | |
1da177e4 | 1284 | |
1a991488 ED |
1285 | if (unlikely(process_backlog >= 16)) { |
1286 | process_backlog = 0; | |
1287 | if (sk_flush_backlog(sk)) | |
1288 | goto restart; | |
d4011239 | 1289 | } |
75c119af | 1290 | first_skb = tcp_rtx_and_write_queues_empty(sk); |
472c2e07 | 1291 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, |
3613b3db | 1292 | first_skb); |
57be5bda AV |
1293 | if (!skb) |
1294 | goto wait_for_memory; | |
1da177e4 | 1295 | |
1a991488 | 1296 | process_backlog++; |
dead7cdb | 1297 | skb->ip_summed = CHECKSUM_PARTIAL; |
1da177e4 | 1298 | |
57be5bda AV |
1299 | skb_entail(sk, skb); |
1300 | copy = size_goal; | |
9d186cac | 1301 | |
57be5bda | 1302 | /* All packets are restored as if they have |
d3edd06e | 1303 | * already been sent. skb_mstamp_ns isn't set to |
57be5bda AV |
1304 | * avoid wrong rtt estimation. |
1305 | */ | |
1306 | if (tp->repair) | |
1307 | TCP_SKB_CB(skb)->sacked |= TCPCB_REPAIRED; | |
1308 | } | |
1da177e4 | 1309 | |
57be5bda | 1310 | /* Try to append data to the end of skb. */ |
01e97e65 AV |
1311 | if (copy > msg_data_left(msg)) |
1312 | copy = msg_data_left(msg); | |
57be5bda AV |
1313 | |
1314 | /* Where to copy to? */ | |
02583ade | 1315 | if (skb_availroom(skb) > 0 && !zc) { |
57be5bda AV |
1316 | /* We have some space in skb head. Superb! */ |
1317 | copy = min_t(int, copy, skb_availroom(skb)); | |
1318 | err = skb_add_data_nocache(sk, skb, &msg->msg_iter, copy); | |
1319 | if (err) | |
1320 | goto do_fault; | |
02583ade | 1321 | } else if (!zc) { |
57be5bda AV |
1322 | bool merge = true; |
1323 | int i = skb_shinfo(skb)->nr_frags; | |
1324 | struct page_frag *pfrag = sk_page_frag(sk); | |
1325 | ||
1326 | if (!sk_page_frag_refill(sk, pfrag)) | |
1327 | goto wait_for_memory; | |
ef015786 | 1328 | |
57be5bda AV |
1329 | if (!skb_can_coalesce(skb, i, pfrag->page, |
1330 | pfrag->offset)) { | |
74d4a8f8 | 1331 | if (i >= sysctl_max_skb_frags) { |
57be5bda AV |
1332 | tcp_mark_push(tp, skb); |
1333 | goto new_segment; | |
1da177e4 | 1334 | } |
57be5bda | 1335 | merge = false; |
1da177e4 LT |
1336 | } |
1337 | ||
57be5bda AV |
1338 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
1339 | ||
1340 | if (!sk_wmem_schedule(sk, copy)) | |
1341 | goto wait_for_memory; | |
1da177e4 | 1342 | |
57be5bda AV |
1343 | err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb, |
1344 | pfrag->page, | |
1345 | pfrag->offset, | |
1346 | copy); | |
1347 | if (err) | |
1348 | goto do_error; | |
1da177e4 | 1349 | |
57be5bda AV |
1350 | /* Update the skb. */ |
1351 | if (merge) { | |
1352 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1353 | } else { | |
1354 | skb_fill_page_desc(skb, i, pfrag->page, | |
1355 | pfrag->offset, copy); | |
4e33e346 | 1356 | page_ref_inc(pfrag->page); |
4ed2d765 | 1357 | } |
57be5bda | 1358 | pfrag->offset += copy; |
f214f915 WB |
1359 | } else { |
1360 | err = skb_zerocopy_iter_stream(sk, skb, msg, copy, uarg); | |
111856c7 WB |
1361 | if (err == -EMSGSIZE || err == -EEXIST) { |
1362 | tcp_mark_push(tp, skb); | |
f214f915 | 1363 | goto new_segment; |
111856c7 | 1364 | } |
f214f915 WB |
1365 | if (err < 0) |
1366 | goto do_error; | |
1367 | copy = err; | |
57be5bda AV |
1368 | } |
1369 | ||
1370 | if (!copied) | |
1371 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; | |
1372 | ||
0f317464 | 1373 | WRITE_ONCE(tp->write_seq, tp->write_seq + copy); |
57be5bda AV |
1374 | TCP_SKB_CB(skb)->end_seq += copy; |
1375 | tcp_skb_pcount_set(skb, 0); | |
1da177e4 | 1376 | |
57be5bda | 1377 | copied += copy; |
01e97e65 | 1378 | if (!msg_data_left(msg)) { |
c134ecb8 MKL |
1379 | if (unlikely(flags & MSG_EOR)) |
1380 | TCP_SKB_CB(skb)->eor = 1; | |
57be5bda AV |
1381 | goto out; |
1382 | } | |
1da177e4 | 1383 | |
65ec6097 | 1384 | if (skb->len < size_goal || (flags & MSG_OOB) || unlikely(tp->repair)) |
1da177e4 LT |
1385 | continue; |
1386 | ||
57be5bda AV |
1387 | if (forced_push(tp)) { |
1388 | tcp_mark_push(tp, skb); | |
1389 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); | |
1390 | } else if (skb == tcp_send_head(sk)) | |
1391 | tcp_push_one(sk, mss_now); | |
1392 | continue; | |
1393 | ||
1da177e4 | 1394 | wait_for_sndbuf: |
57be5bda | 1395 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1da177e4 | 1396 | wait_for_memory: |
57be5bda AV |
1397 | if (copied) |
1398 | tcp_push(sk, flags & ~MSG_MORE, mss_now, | |
1399 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1400 | |
686a5624 YM |
1401 | err = sk_stream_wait_memory(sk, &timeo); |
1402 | if (err != 0) | |
57be5bda | 1403 | goto do_error; |
1da177e4 | 1404 | |
57be5bda | 1405 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1406 | } |
1407 | ||
1408 | out: | |
ad02c4f5 | 1409 | if (copied) { |
4e8cc228 | 1410 | tcp_tx_timestamp(sk, sockc.tsflags); |
f54b3111 | 1411 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); |
ad02c4f5 | 1412 | } |
5924f17a | 1413 | out_nopush: |
f214f915 | 1414 | sock_zerocopy_put(uarg); |
cf60af03 | 1415 | return copied + copied_syn; |
1da177e4 | 1416 | |
fdfc5c85 ED |
1417 | do_error: |
1418 | skb = tcp_write_queue_tail(sk); | |
1da177e4 | 1419 | do_fault: |
fdfc5c85 | 1420 | tcp_remove_empty_skb(sk, skb); |
1da177e4 | 1421 | |
cf60af03 | 1422 | if (copied + copied_syn) |
1da177e4 LT |
1423 | goto out; |
1424 | out_err: | |
52900d22 | 1425 | sock_zerocopy_put_abort(uarg, true); |
1da177e4 | 1426 | err = sk_stream_error(sk, flags, err); |
ce5ec440 | 1427 | /* make sure we wake any epoll edge trigger waiter */ |
216808c6 | 1428 | if (unlikely(tcp_rtx_and_write_queues_empty(sk) && err == -EAGAIN)) { |
ce5ec440 | 1429 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1430 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1431 | } | |
1da177e4 LT |
1432 | return err; |
1433 | } | |
774c4673 | 1434 | EXPORT_SYMBOL_GPL(tcp_sendmsg_locked); |
306b13eb TH |
1435 | |
1436 | int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
1437 | { | |
1438 | int ret; | |
1439 | ||
1440 | lock_sock(sk); | |
1441 | ret = tcp_sendmsg_locked(sk, msg, size); | |
1442 | release_sock(sk); | |
1443 | ||
1444 | return ret; | |
1445 | } | |
4bc2f18b | 1446 | EXPORT_SYMBOL(tcp_sendmsg); |
1da177e4 LT |
1447 | |
1448 | /* | |
1449 | * Handle reading urgent data. BSD has very simple semantics for | |
1450 | * this, no blocking and very strange errors 8) | |
1451 | */ | |
1452 | ||
377f0a08 | 1453 | static int tcp_recv_urg(struct sock *sk, struct msghdr *msg, int len, int flags) |
1da177e4 LT |
1454 | { |
1455 | struct tcp_sock *tp = tcp_sk(sk); | |
1456 | ||
1457 | /* No URG data to read. */ | |
1458 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || | |
1459 | tp->urg_data == TCP_URG_READ) | |
1460 | return -EINVAL; /* Yes this is right ! */ | |
1461 | ||
1462 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) | |
1463 | return -ENOTCONN; | |
1464 | ||
1465 | if (tp->urg_data & TCP_URG_VALID) { | |
1466 | int err = 0; | |
1467 | char c = tp->urg_data; | |
1468 | ||
1469 | if (!(flags & MSG_PEEK)) | |
1470 | tp->urg_data = TCP_URG_READ; | |
1471 | ||
1472 | /* Read urgent data. */ | |
1473 | msg->msg_flags |= MSG_OOB; | |
1474 | ||
1475 | if (len > 0) { | |
1476 | if (!(flags & MSG_TRUNC)) | |
7eab8d9e | 1477 | err = memcpy_to_msg(msg, &c, 1); |
1da177e4 LT |
1478 | len = 1; |
1479 | } else | |
1480 | msg->msg_flags |= MSG_TRUNC; | |
1481 | ||
1482 | return err ? -EFAULT : len; | |
1483 | } | |
1484 | ||
1485 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1486 | return 0; | |
1487 | ||
1488 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and | |
1489 | * the available implementations agree in this case: | |
1490 | * this call should never block, independent of the | |
1491 | * blocking state of the socket. | |
1492 | * Mike <pall@rz.uni-karlsruhe.de> | |
1493 | */ | |
1494 | return -EAGAIN; | |
1495 | } | |
1496 | ||
c0e88ff0 PE |
1497 | static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len) |
1498 | { | |
1499 | struct sk_buff *skb; | |
1500 | int copied = 0, err = 0; | |
1501 | ||
1502 | /* XXX -- need to support SO_PEEK_OFF */ | |
1503 | ||
75c119af ED |
1504 | skb_rbtree_walk(skb, &sk->tcp_rtx_queue) { |
1505 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); | |
1506 | if (err) | |
1507 | return err; | |
1508 | copied += skb->len; | |
1509 | } | |
1510 | ||
c0e88ff0 | 1511 | skb_queue_walk(&sk->sk_write_queue, skb) { |
51f3d02b | 1512 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); |
c0e88ff0 PE |
1513 | if (err) |
1514 | break; | |
1515 | ||
1516 | copied += skb->len; | |
1517 | } | |
1518 | ||
1519 | return err ?: copied; | |
1520 | } | |
1521 | ||
1da177e4 LT |
1522 | /* Clean up the receive buffer for full frames taken by the user, |
1523 | * then send an ACK if necessary. COPIED is the number of bytes | |
1524 | * tcp_recvmsg has given to the user so far, it speeds up the | |
1525 | * calculation of whether or not we must ACK for the sake of | |
1526 | * a window update. | |
1527 | */ | |
3f334078 | 1528 | static void tcp_cleanup_rbuf(struct sock *sk, int copied) |
1da177e4 LT |
1529 | { |
1530 | struct tcp_sock *tp = tcp_sk(sk); | |
a2a385d6 | 1531 | bool time_to_ack = false; |
1da177e4 | 1532 | |
1da177e4 LT |
1533 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
1534 | ||
d792c100 | 1535 | WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq), |
2af6fd8b | 1536 | "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n", |
d792c100 | 1537 | tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt); |
1da177e4 | 1538 | |
463c84b9 ACM |
1539 | if (inet_csk_ack_scheduled(sk)) { |
1540 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 LT |
1541 | /* Delayed ACKs frequently hit locked sockets during bulk |
1542 | * receive. */ | |
463c84b9 | 1543 | if (icsk->icsk_ack.blocked || |
1da177e4 | 1544 | /* Once-per-two-segments ACK was not sent by tcp_input.c */ |
463c84b9 | 1545 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
1da177e4 LT |
1546 | /* |
1547 | * If this read emptied read buffer, we send ACK, if | |
1548 | * connection is not bidirectional, user drained | |
1549 | * receive buffer and there was a small segment | |
1550 | * in queue. | |
1551 | */ | |
1ef9696c AK |
1552 | (copied > 0 && |
1553 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) || | |
1554 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && | |
31954cd8 | 1555 | !inet_csk_in_pingpong_mode(sk))) && |
1ef9696c | 1556 | !atomic_read(&sk->sk_rmem_alloc))) |
a2a385d6 | 1557 | time_to_ack = true; |
1da177e4 LT |
1558 | } |
1559 | ||
1560 | /* We send an ACK if we can now advertise a non-zero window | |
1561 | * which has been raised "significantly". | |
1562 | * | |
1563 | * Even if window raised up to infinity, do not send window open ACK | |
1564 | * in states, where we will not receive more. It is useless. | |
1565 | */ | |
1566 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
1567 | __u32 rcv_window_now = tcp_receive_window(tp); | |
1568 | ||
1569 | /* Optimize, __tcp_select_window() is not cheap. */ | |
1570 | if (2*rcv_window_now <= tp->window_clamp) { | |
1571 | __u32 new_window = __tcp_select_window(sk); | |
1572 | ||
1573 | /* Send ACK now, if this read freed lots of space | |
1574 | * in our buffer. Certainly, new_window is new window. | |
1575 | * We can advertise it now, if it is not less than current one. | |
1576 | * "Lots" means "at least twice" here. | |
1577 | */ | |
1578 | if (new_window && new_window >= 2 * rcv_window_now) | |
a2a385d6 | 1579 | time_to_ack = true; |
1da177e4 LT |
1580 | } |
1581 | } | |
1582 | if (time_to_ack) | |
1583 | tcp_send_ack(sk); | |
1584 | } | |
1585 | ||
f26845b4 | 1586 | static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
1da177e4 LT |
1587 | { |
1588 | struct sk_buff *skb; | |
1589 | u32 offset; | |
1590 | ||
f26845b4 | 1591 | while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) { |
1da177e4 | 1592 | offset = seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
1593 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
1594 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 1595 | offset--; |
9d691539 | 1596 | } |
e11ecddf | 1597 | if (offset < skb->len || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) { |
1da177e4 LT |
1598 | *off = offset; |
1599 | return skb; | |
1600 | } | |
f26845b4 ED |
1601 | /* This looks weird, but this can happen if TCP collapsing |
1602 | * splitted a fat GRO packet, while we released socket lock | |
1603 | * in skb_splice_bits() | |
1604 | */ | |
7bced397 | 1605 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1606 | } |
1607 | return NULL; | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | * This routine provides an alternative to tcp_recvmsg() for routines | |
1612 | * that would like to handle copying from skbuffs directly in 'sendfile' | |
1613 | * fashion. | |
1614 | * Note: | |
1615 | * - It is assumed that the socket was locked by the caller. | |
1616 | * - The routine does not block. | |
1617 | * - At present, there is no support for reading OOB data | |
1618 | * or for 'peeking' the socket using this routine | |
1619 | * (although both would be easy to implement). | |
1620 | */ | |
1621 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, | |
1622 | sk_read_actor_t recv_actor) | |
1623 | { | |
1624 | struct sk_buff *skb; | |
1625 | struct tcp_sock *tp = tcp_sk(sk); | |
1626 | u32 seq = tp->copied_seq; | |
1627 | u32 offset; | |
1628 | int copied = 0; | |
1629 | ||
1630 | if (sk->sk_state == TCP_LISTEN) | |
1631 | return -ENOTCONN; | |
1632 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { | |
1633 | if (offset < skb->len) { | |
374e7b59 OP |
1634 | int used; |
1635 | size_t len; | |
1da177e4 LT |
1636 | |
1637 | len = skb->len - offset; | |
1638 | /* Stop reading if we hit a patch of urgent data */ | |
1639 | if (tp->urg_data) { | |
1640 | u32 urg_offset = tp->urg_seq - seq; | |
1641 | if (urg_offset < len) | |
1642 | len = urg_offset; | |
1643 | if (!len) | |
1644 | break; | |
1645 | } | |
1646 | used = recv_actor(desc, skb, offset, len); | |
ff905b1e | 1647 | if (used <= 0) { |
ddb61a57 JA |
1648 | if (!copied) |
1649 | copied = used; | |
1650 | break; | |
1651 | } else if (used <= len) { | |
1da177e4 LT |
1652 | seq += used; |
1653 | copied += used; | |
1654 | offset += used; | |
1655 | } | |
02275a2e | 1656 | /* If recv_actor drops the lock (e.g. TCP splice |
293ad604 OP |
1657 | * receive) the skb pointer might be invalid when |
1658 | * getting here: tcp_collapse might have deleted it | |
1659 | * while aggregating skbs from the socket queue. | |
1660 | */ | |
02275a2e WT |
1661 | skb = tcp_recv_skb(sk, seq - 1, &offset); |
1662 | if (!skb) | |
1da177e4 | 1663 | break; |
02275a2e WT |
1664 | /* TCP coalescing might have appended data to the skb. |
1665 | * Try to splice more frags | |
1666 | */ | |
1667 | if (offset + 1 != skb->len) | |
1668 | continue; | |
1da177e4 | 1669 | } |
e11ecddf | 1670 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) { |
7bced397 | 1671 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1672 | ++seq; |
1673 | break; | |
1674 | } | |
7bced397 | 1675 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1676 | if (!desc->count) |
1677 | break; | |
7db48e98 | 1678 | WRITE_ONCE(tp->copied_seq, seq); |
1da177e4 | 1679 | } |
7db48e98 | 1680 | WRITE_ONCE(tp->copied_seq, seq); |
1da177e4 LT |
1681 | |
1682 | tcp_rcv_space_adjust(sk); | |
1683 | ||
1684 | /* Clean up data we have read: This will do ACK frames. */ | |
f26845b4 ED |
1685 | if (copied > 0) { |
1686 | tcp_recv_skb(sk, seq, &offset); | |
0e4b4992 | 1687 | tcp_cleanup_rbuf(sk, copied); |
f26845b4 | 1688 | } |
1da177e4 LT |
1689 | return copied; |
1690 | } | |
4bc2f18b | 1691 | EXPORT_SYMBOL(tcp_read_sock); |
1da177e4 | 1692 | |
32035585 TH |
1693 | int tcp_peek_len(struct socket *sock) |
1694 | { | |
1695 | return tcp_inq(sock->sk); | |
1696 | } | |
1697 | EXPORT_SYMBOL(tcp_peek_len); | |
1698 | ||
d1361840 ED |
1699 | /* Make sure sk_rcvbuf is big enough to satisfy SO_RCVLOWAT hint */ |
1700 | int tcp_set_rcvlowat(struct sock *sk, int val) | |
1701 | { | |
867f816b SHY |
1702 | int cap; |
1703 | ||
1704 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) | |
1705 | cap = sk->sk_rcvbuf >> 1; | |
1706 | else | |
1707 | cap = sock_net(sk)->ipv4.sysctl_tcp_rmem[2] >> 1; | |
1708 | val = min(val, cap); | |
eac66402 | 1709 | WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
03f45c88 ED |
1710 | |
1711 | /* Check if we need to signal EPOLLIN right now */ | |
1712 | tcp_data_ready(sk); | |
1713 | ||
d1361840 ED |
1714 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
1715 | return 0; | |
1716 | ||
d1361840 | 1717 | val <<= 1; |
d1361840 | 1718 | if (val > sk->sk_rcvbuf) { |
ebb3b78d | 1719 | WRITE_ONCE(sk->sk_rcvbuf, val); |
d1361840 ED |
1720 | tcp_sk(sk)->window_clamp = tcp_win_from_space(sk, val); |
1721 | } | |
1722 | return 0; | |
1723 | } | |
1724 | EXPORT_SYMBOL(tcp_set_rcvlowat); | |
1725 | ||
05255b82 ED |
1726 | #ifdef CONFIG_MMU |
1727 | static const struct vm_operations_struct tcp_vm_ops = { | |
1728 | }; | |
1729 | ||
93ab6cc6 ED |
1730 | int tcp_mmap(struct file *file, struct socket *sock, |
1731 | struct vm_area_struct *vma) | |
1732 | { | |
05255b82 ED |
1733 | if (vma->vm_flags & (VM_WRITE | VM_EXEC)) |
1734 | return -EPERM; | |
1735 | vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC); | |
1736 | ||
1737 | /* Instruct vm_insert_page() to not down_read(mmap_sem) */ | |
1738 | vma->vm_flags |= VM_MIXEDMAP; | |
1739 | ||
1740 | vma->vm_ops = &tcp_vm_ops; | |
1741 | return 0; | |
1742 | } | |
1743 | EXPORT_SYMBOL(tcp_mmap); | |
1744 | ||
1745 | static int tcp_zerocopy_receive(struct sock *sk, | |
1746 | struct tcp_zerocopy_receive *zc) | |
1747 | { | |
1748 | unsigned long address = (unsigned long)zc->address; | |
c208bdb9 | 1749 | u32 length = 0, seq, offset, zap_len; |
05255b82 | 1750 | const skb_frag_t *frags = NULL; |
05255b82 ED |
1751 | struct vm_area_struct *vma; |
1752 | struct sk_buff *skb = NULL; | |
93ab6cc6 | 1753 | struct tcp_sock *tp; |
8f2b0293 | 1754 | int inq; |
93ab6cc6 ED |
1755 | int ret; |
1756 | ||
05255b82 | 1757 | if (address & (PAGE_SIZE - 1) || address != zc->address) |
93ab6cc6 ED |
1758 | return -EINVAL; |
1759 | ||
93ab6cc6 | 1760 | if (sk->sk_state == TCP_LISTEN) |
05255b82 | 1761 | return -ENOTCONN; |
93ab6cc6 ED |
1762 | |
1763 | sock_rps_record_flow(sk); | |
1764 | ||
05255b82 ED |
1765 | down_read(¤t->mm->mmap_sem); |
1766 | ||
05255b82 | 1767 | vma = find_vma(current->mm, address); |
e776af60 ED |
1768 | if (!vma || vma->vm_start > address || vma->vm_ops != &tcp_vm_ops) { |
1769 | up_read(¤t->mm->mmap_sem); | |
1770 | return -EINVAL; | |
1771 | } | |
05255b82 ED |
1772 | zc->length = min_t(unsigned long, zc->length, vma->vm_end - address); |
1773 | ||
93ab6cc6 ED |
1774 | tp = tcp_sk(sk); |
1775 | seq = tp->copied_seq; | |
8f2b0293 SHY |
1776 | inq = tcp_inq(sk); |
1777 | zc->length = min_t(u32, zc->length, inq); | |
c208bdb9 SHY |
1778 | zap_len = zc->length & ~(PAGE_SIZE - 1); |
1779 | if (zap_len) { | |
1780 | zap_page_range(vma, address, zap_len); | |
8f2b0293 SHY |
1781 | zc->recv_skip_hint = 0; |
1782 | } else { | |
c208bdb9 | 1783 | zc->recv_skip_hint = zc->length; |
8f2b0293 | 1784 | } |
05255b82 ED |
1785 | ret = 0; |
1786 | while (length + PAGE_SIZE <= zc->length) { | |
1787 | if (zc->recv_skip_hint < PAGE_SIZE) { | |
1788 | if (skb) { | |
0e627190 AR |
1789 | if (zc->recv_skip_hint > 0) |
1790 | break; | |
05255b82 ED |
1791 | skb = skb->next; |
1792 | offset = seq - TCP_SKB_CB(skb)->seq; | |
1793 | } else { | |
1794 | skb = tcp_recv_skb(sk, seq, &offset); | |
1795 | } | |
1796 | ||
1797 | zc->recv_skip_hint = skb->len - offset; | |
1798 | offset -= skb_headlen(skb); | |
1799 | if ((int)offset < 0 || skb_has_frag_list(skb)) | |
1800 | break; | |
1801 | frags = skb_shinfo(skb)->frags; | |
1802 | while (offset) { | |
d8e18a51 | 1803 | if (skb_frag_size(frags) > offset) |
05255b82 | 1804 | goto out; |
d8e18a51 | 1805 | offset -= skb_frag_size(frags); |
05255b82 ED |
1806 | frags++; |
1807 | } | |
93ab6cc6 | 1808 | } |
b54c9d5b | 1809 | if (skb_frag_size(frags) != PAGE_SIZE || skb_frag_off(frags)) { |
789762ce SHY |
1810 | int remaining = zc->recv_skip_hint; |
1811 | ||
3afb0961 | 1812 | while (remaining && (skb_frag_size(frags) != PAGE_SIZE || |
b54c9d5b | 1813 | skb_frag_off(frags))) { |
3afb0961 | 1814 | remaining -= skb_frag_size(frags); |
789762ce SHY |
1815 | frags++; |
1816 | } | |
1817 | zc->recv_skip_hint -= remaining; | |
05255b82 | 1818 | break; |
789762ce | 1819 | } |
05255b82 ED |
1820 | ret = vm_insert_page(vma, address + length, |
1821 | skb_frag_page(frags)); | |
93ab6cc6 | 1822 | if (ret) |
05255b82 ED |
1823 | break; |
1824 | length += PAGE_SIZE; | |
1825 | seq += PAGE_SIZE; | |
1826 | zc->recv_skip_hint -= PAGE_SIZE; | |
1827 | frags++; | |
93ab6cc6 | 1828 | } |
93ab6cc6 | 1829 | out: |
05255b82 ED |
1830 | up_read(¤t->mm->mmap_sem); |
1831 | if (length) { | |
7db48e98 | 1832 | WRITE_ONCE(tp->copied_seq, seq); |
05255b82 ED |
1833 | tcp_rcv_space_adjust(sk); |
1834 | ||
1835 | /* Clean up data we have read: This will do ACK frames. */ | |
1836 | tcp_recv_skb(sk, seq, &offset); | |
1837 | tcp_cleanup_rbuf(sk, length); | |
1838 | ret = 0; | |
1839 | if (length == zc->length) | |
1840 | zc->recv_skip_hint = 0; | |
1841 | } else { | |
1842 | if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE)) | |
1843 | ret = -EIO; | |
1844 | } | |
1845 | zc->length = length; | |
93ab6cc6 ED |
1846 | return ret; |
1847 | } | |
05255b82 | 1848 | #endif |
93ab6cc6 | 1849 | |
98aaa913 | 1850 | static void tcp_update_recv_tstamps(struct sk_buff *skb, |
9718475e | 1851 | struct scm_timestamping_internal *tss) |
98aaa913 MM |
1852 | { |
1853 | if (skb->tstamp) | |
9718475e | 1854 | tss->ts[0] = ktime_to_timespec64(skb->tstamp); |
98aaa913 | 1855 | else |
9718475e | 1856 | tss->ts[0] = (struct timespec64) {0}; |
98aaa913 MM |
1857 | |
1858 | if (skb_hwtstamps(skb)->hwtstamp) | |
9718475e | 1859 | tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp); |
98aaa913 | 1860 | else |
9718475e | 1861 | tss->ts[2] = (struct timespec64) {0}; |
98aaa913 MM |
1862 | } |
1863 | ||
1864 | /* Similar to __sock_recv_timestamp, but does not require an skb */ | |
809a79e9 | 1865 | static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk, |
9718475e | 1866 | struct scm_timestamping_internal *tss) |
98aaa913 | 1867 | { |
887feae3 | 1868 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
98aaa913 MM |
1869 | bool has_timestamping = false; |
1870 | ||
1871 | if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) { | |
1872 | if (sock_flag(sk, SOCK_RCVTSTAMP)) { | |
1873 | if (sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 | 1874 | if (new_tstamp) { |
df1b4ba9 AB |
1875 | struct __kernel_timespec kts = { |
1876 | .tv_sec = tss->ts[0].tv_sec, | |
1877 | .tv_nsec = tss->ts[0].tv_nsec, | |
1878 | }; | |
887feae3 DD |
1879 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, |
1880 | sizeof(kts), &kts); | |
1881 | } else { | |
df1b4ba9 AB |
1882 | struct __kernel_old_timespec ts_old = { |
1883 | .tv_sec = tss->ts[0].tv_sec, | |
1884 | .tv_nsec = tss->ts[0].tv_nsec, | |
1885 | }; | |
887feae3 | 1886 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, |
9718475e | 1887 | sizeof(ts_old), &ts_old); |
887feae3 | 1888 | } |
98aaa913 | 1889 | } else { |
887feae3 | 1890 | if (new_tstamp) { |
df1b4ba9 AB |
1891 | struct __kernel_sock_timeval stv = { |
1892 | .tv_sec = tss->ts[0].tv_sec, | |
1893 | .tv_usec = tss->ts[0].tv_nsec / 1000, | |
1894 | }; | |
887feae3 DD |
1895 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, |
1896 | sizeof(stv), &stv); | |
1897 | } else { | |
df1b4ba9 AB |
1898 | struct __kernel_old_timeval tv = { |
1899 | .tv_sec = tss->ts[0].tv_sec, | |
1900 | .tv_usec = tss->ts[0].tv_nsec / 1000, | |
1901 | }; | |
887feae3 DD |
1902 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, |
1903 | sizeof(tv), &tv); | |
1904 | } | |
98aaa913 MM |
1905 | } |
1906 | } | |
1907 | ||
1908 | if (sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) | |
1909 | has_timestamping = true; | |
1910 | else | |
9718475e | 1911 | tss->ts[0] = (struct timespec64) {0}; |
98aaa913 MM |
1912 | } |
1913 | ||
1914 | if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) { | |
1915 | if (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) | |
1916 | has_timestamping = true; | |
1917 | else | |
9718475e | 1918 | tss->ts[2] = (struct timespec64) {0}; |
98aaa913 MM |
1919 | } |
1920 | ||
1921 | if (has_timestamping) { | |
9718475e DD |
1922 | tss->ts[1] = (struct timespec64) {0}; |
1923 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) | |
1924 | put_cmsg_scm_timestamping64(msg, tss); | |
1925 | else | |
1926 | put_cmsg_scm_timestamping(msg, tss); | |
98aaa913 MM |
1927 | } |
1928 | } | |
1929 | ||
b75eba76 SHY |
1930 | static int tcp_inq_hint(struct sock *sk) |
1931 | { | |
1932 | const struct tcp_sock *tp = tcp_sk(sk); | |
1933 | u32 copied_seq = READ_ONCE(tp->copied_seq); | |
1934 | u32 rcv_nxt = READ_ONCE(tp->rcv_nxt); | |
1935 | int inq; | |
1936 | ||
1937 | inq = rcv_nxt - copied_seq; | |
1938 | if (unlikely(inq < 0 || copied_seq != READ_ONCE(tp->copied_seq))) { | |
1939 | lock_sock(sk); | |
1940 | inq = tp->rcv_nxt - tp->copied_seq; | |
1941 | release_sock(sk); | |
1942 | } | |
6466e715 SHY |
1943 | /* After receiving a FIN, tell the user-space to continue reading |
1944 | * by returning a non-zero inq. | |
1945 | */ | |
1946 | if (inq == 0 && sock_flag(sk, SOCK_DONE)) | |
1947 | inq = 1; | |
b75eba76 SHY |
1948 | return inq; |
1949 | } | |
1950 | ||
1da177e4 LT |
1951 | /* |
1952 | * This routine copies from a sock struct into the user buffer. | |
1953 | * | |
1954 | * Technical note: in 2.3 we work on _locked_ socket, so that | |
1955 | * tricks with *seq access order and skb->users are not required. | |
1956 | * Probably, code can be easily improved even more. | |
1957 | */ | |
1958 | ||
1b784140 YX |
1959 | int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
1960 | int flags, int *addr_len) | |
1da177e4 LT |
1961 | { |
1962 | struct tcp_sock *tp = tcp_sk(sk); | |
1963 | int copied = 0; | |
1964 | u32 peek_seq; | |
1965 | u32 *seq; | |
1966 | unsigned long used; | |
b75eba76 | 1967 | int err, inq; |
1da177e4 LT |
1968 | int target; /* Read at least this many bytes */ |
1969 | long timeo; | |
dfbafc99 | 1970 | struct sk_buff *skb, *last; |
77527313 | 1971 | u32 urg_hole = 0; |
9718475e | 1972 | struct scm_timestamping_internal tss; |
a5a7daa5 | 1973 | int cmsg_flags; |
1da177e4 | 1974 | |
4ed2d765 | 1975 | if (unlikely(flags & MSG_ERRQUEUE)) |
f4713a3d | 1976 | return inet_recv_error(sk, msg, len, addr_len); |
4ed2d765 | 1977 | |
3f926af3 | 1978 | if (sk_can_busy_loop(sk) && skb_queue_empty_lockless(&sk->sk_receive_queue) && |
cbf55001 ET |
1979 | (sk->sk_state == TCP_ESTABLISHED)) |
1980 | sk_busy_loop(sk, nonblock); | |
d30e383b | 1981 | |
1da177e4 LT |
1982 | lock_sock(sk); |
1983 | ||
1da177e4 LT |
1984 | err = -ENOTCONN; |
1985 | if (sk->sk_state == TCP_LISTEN) | |
1986 | goto out; | |
1987 | ||
a5a7daa5 | 1988 | cmsg_flags = tp->recvmsg_inq ? 1 : 0; |
1da177e4 LT |
1989 | timeo = sock_rcvtimeo(sk, nonblock); |
1990 | ||
1991 | /* Urgent data needs to be handled specially. */ | |
1992 | if (flags & MSG_OOB) | |
1993 | goto recv_urg; | |
1994 | ||
c0e88ff0 PE |
1995 | if (unlikely(tp->repair)) { |
1996 | err = -EPERM; | |
1997 | if (!(flags & MSG_PEEK)) | |
1998 | goto out; | |
1999 | ||
2000 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
2001 | goto recv_sndq; | |
2002 | ||
2003 | err = -EINVAL; | |
2004 | if (tp->repair_queue == TCP_NO_QUEUE) | |
2005 | goto out; | |
2006 | ||
2007 | /* 'common' recv queue MSG_PEEK-ing */ | |
2008 | } | |
2009 | ||
1da177e4 LT |
2010 | seq = &tp->copied_seq; |
2011 | if (flags & MSG_PEEK) { | |
2012 | peek_seq = tp->copied_seq; | |
2013 | seq = &peek_seq; | |
2014 | } | |
2015 | ||
2016 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
2017 | ||
2018 | do { | |
1da177e4 LT |
2019 | u32 offset; |
2020 | ||
2021 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ | |
2022 | if (tp->urg_data && tp->urg_seq == *seq) { | |
2023 | if (copied) | |
2024 | break; | |
2025 | if (signal_pending(current)) { | |
2026 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
2027 | break; | |
2028 | } | |
2029 | } | |
2030 | ||
2031 | /* Next get a buffer. */ | |
2032 | ||
dfbafc99 | 2033 | last = skb_peek_tail(&sk->sk_receive_queue); |
91521944 | 2034 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
dfbafc99 | 2035 | last = skb; |
1da177e4 LT |
2036 | /* Now that we have two receive queues this |
2037 | * shouldn't happen. | |
2038 | */ | |
d792c100 | 2039 | if (WARN(before(*seq, TCP_SKB_CB(skb)->seq), |
e56b8ce3 | 2040 | "TCP recvmsg seq # bug: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b JP |
2041 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, |
2042 | flags)) | |
1da177e4 | 2043 | break; |
d792c100 | 2044 | |
1da177e4 | 2045 | offset = *seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
2046 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
2047 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 2048 | offset--; |
9d691539 | 2049 | } |
1da177e4 LT |
2050 | if (offset < skb->len) |
2051 | goto found_ok_skb; | |
e11ecddf | 2052 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2053 | goto found_fin_ok; |
2af6fd8b | 2054 | WARN(!(flags & MSG_PEEK), |
e56b8ce3 | 2055 | "TCP recvmsg seq # bug 2: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b | 2056 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, flags); |
91521944 | 2057 | } |
1da177e4 LT |
2058 | |
2059 | /* Well, if we have backlog, try to process it now yet. */ | |
2060 | ||
9ed498c6 | 2061 | if (copied >= target && !READ_ONCE(sk->sk_backlog.tail)) |
1da177e4 LT |
2062 | break; |
2063 | ||
2064 | if (copied) { | |
2065 | if (sk->sk_err || | |
2066 | sk->sk_state == TCP_CLOSE || | |
2067 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
2068 | !timeo || | |
518a09ef | 2069 | signal_pending(current)) |
1da177e4 LT |
2070 | break; |
2071 | } else { | |
2072 | if (sock_flag(sk, SOCK_DONE)) | |
2073 | break; | |
2074 | ||
2075 | if (sk->sk_err) { | |
2076 | copied = sock_error(sk); | |
2077 | break; | |
2078 | } | |
2079 | ||
2080 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2081 | break; | |
2082 | ||
2083 | if (sk->sk_state == TCP_CLOSE) { | |
c47078d6 ED |
2084 | /* This occurs when user tries to read |
2085 | * from never connected socket. | |
2086 | */ | |
2087 | copied = -ENOTCONN; | |
1da177e4 LT |
2088 | break; |
2089 | } | |
2090 | ||
2091 | if (!timeo) { | |
2092 | copied = -EAGAIN; | |
2093 | break; | |
2094 | } | |
2095 | ||
2096 | if (signal_pending(current)) { | |
2097 | copied = sock_intr_errno(timeo); | |
2098 | break; | |
2099 | } | |
2100 | } | |
2101 | ||
0e4b4992 | 2102 | tcp_cleanup_rbuf(sk, copied); |
1da177e4 | 2103 | |
1da177e4 LT |
2104 | if (copied >= target) { |
2105 | /* Do not sleep, just process backlog. */ | |
2106 | release_sock(sk); | |
2107 | lock_sock(sk); | |
dfbafc99 SD |
2108 | } else { |
2109 | sk_wait_data(sk, &timeo, last); | |
2110 | } | |
1da177e4 | 2111 | |
77527313 IJ |
2112 | if ((flags & MSG_PEEK) && |
2113 | (peek_seq - copied - urg_hole != tp->copied_seq)) { | |
e87cc472 JP |
2114 | net_dbg_ratelimited("TCP(%s:%d): Application bug, race in MSG_PEEK\n", |
2115 | current->comm, | |
2116 | task_pid_nr(current)); | |
1da177e4 LT |
2117 | peek_seq = tp->copied_seq; |
2118 | } | |
2119 | continue; | |
2120 | ||
fdb8b298 | 2121 | found_ok_skb: |
1da177e4 LT |
2122 | /* Ok so how much can we use? */ |
2123 | used = skb->len - offset; | |
2124 | if (len < used) | |
2125 | used = len; | |
2126 | ||
2127 | /* Do we have urgent data here? */ | |
2128 | if (tp->urg_data) { | |
2129 | u32 urg_offset = tp->urg_seq - *seq; | |
2130 | if (urg_offset < used) { | |
2131 | if (!urg_offset) { | |
2132 | if (!sock_flag(sk, SOCK_URGINLINE)) { | |
7db48e98 | 2133 | WRITE_ONCE(*seq, *seq + 1); |
77527313 | 2134 | urg_hole++; |
1da177e4 LT |
2135 | offset++; |
2136 | used--; | |
2137 | if (!used) | |
2138 | goto skip_copy; | |
2139 | } | |
2140 | } else | |
2141 | used = urg_offset; | |
2142 | } | |
2143 | } | |
2144 | ||
2145 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 2146 | err = skb_copy_datagram_msg(skb, offset, msg, used); |
7bced397 DW |
2147 | if (err) { |
2148 | /* Exception. Bailout! */ | |
2149 | if (!copied) | |
2150 | copied = -EFAULT; | |
2151 | break; | |
1da177e4 LT |
2152 | } |
2153 | } | |
2154 | ||
7db48e98 | 2155 | WRITE_ONCE(*seq, *seq + used); |
1da177e4 LT |
2156 | copied += used; |
2157 | len -= used; | |
2158 | ||
2159 | tcp_rcv_space_adjust(sk); | |
2160 | ||
2161 | skip_copy: | |
31770e34 | 2162 | if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) { |
1da177e4 | 2163 | tp->urg_data = 0; |
31770e34 FW |
2164 | tcp_fast_path_check(sk); |
2165 | } | |
1da177e4 | 2166 | |
98aaa913 MM |
2167 | if (TCP_SKB_CB(skb)->has_rxtstamp) { |
2168 | tcp_update_recv_tstamps(skb, &tss); | |
a5a7daa5 | 2169 | cmsg_flags |= 2; |
98aaa913 | 2170 | } |
cc4de047 KL |
2171 | |
2172 | if (used + offset < skb->len) | |
2173 | continue; | |
2174 | ||
e11ecddf | 2175 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2176 | goto found_fin_ok; |
7bced397 DW |
2177 | if (!(flags & MSG_PEEK)) |
2178 | sk_eat_skb(sk, skb); | |
1da177e4 LT |
2179 | continue; |
2180 | ||
fdb8b298 | 2181 | found_fin_ok: |
1da177e4 | 2182 | /* Process the FIN. */ |
7db48e98 | 2183 | WRITE_ONCE(*seq, *seq + 1); |
7bced397 DW |
2184 | if (!(flags & MSG_PEEK)) |
2185 | sk_eat_skb(sk, skb); | |
1da177e4 LT |
2186 | break; |
2187 | } while (len > 0); | |
2188 | ||
1da177e4 LT |
2189 | /* According to UNIX98, msg_name/msg_namelen are ignored |
2190 | * on connected socket. I was just happy when found this 8) --ANK | |
2191 | */ | |
2192 | ||
2193 | /* Clean up data we have read: This will do ACK frames. */ | |
0e4b4992 | 2194 | tcp_cleanup_rbuf(sk, copied); |
1da177e4 | 2195 | |
1da177e4 | 2196 | release_sock(sk); |
b75eba76 | 2197 | |
a5a7daa5 ED |
2198 | if (cmsg_flags) { |
2199 | if (cmsg_flags & 2) | |
b75eba76 | 2200 | tcp_recv_timestamp(msg, sk, &tss); |
a5a7daa5 | 2201 | if (cmsg_flags & 1) { |
b75eba76 SHY |
2202 | inq = tcp_inq_hint(sk); |
2203 | put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq); | |
2204 | } | |
2205 | } | |
2206 | ||
1da177e4 LT |
2207 | return copied; |
2208 | ||
2209 | out: | |
1da177e4 LT |
2210 | release_sock(sk); |
2211 | return err; | |
2212 | ||
2213 | recv_urg: | |
377f0a08 | 2214 | err = tcp_recv_urg(sk, msg, len, flags); |
1da177e4 | 2215 | goto out; |
c0e88ff0 PE |
2216 | |
2217 | recv_sndq: | |
2218 | err = tcp_peek_sndq(sk, msg, len); | |
2219 | goto out; | |
1da177e4 | 2220 | } |
4bc2f18b | 2221 | EXPORT_SYMBOL(tcp_recvmsg); |
1da177e4 | 2222 | |
490d5046 IJ |
2223 | void tcp_set_state(struct sock *sk, int state) |
2224 | { | |
2225 | int oldstate = sk->sk_state; | |
2226 | ||
d4487491 LB |
2227 | /* We defined a new enum for TCP states that are exported in BPF |
2228 | * so as not force the internal TCP states to be frozen. The | |
2229 | * following checks will detect if an internal state value ever | |
2230 | * differs from the BPF value. If this ever happens, then we will | |
2231 | * need to remap the internal value to the BPF value before calling | |
2232 | * tcp_call_bpf_2arg. | |
2233 | */ | |
2234 | BUILD_BUG_ON((int)BPF_TCP_ESTABLISHED != (int)TCP_ESTABLISHED); | |
2235 | BUILD_BUG_ON((int)BPF_TCP_SYN_SENT != (int)TCP_SYN_SENT); | |
2236 | BUILD_BUG_ON((int)BPF_TCP_SYN_RECV != (int)TCP_SYN_RECV); | |
2237 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT1 != (int)TCP_FIN_WAIT1); | |
2238 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT2 != (int)TCP_FIN_WAIT2); | |
2239 | BUILD_BUG_ON((int)BPF_TCP_TIME_WAIT != (int)TCP_TIME_WAIT); | |
2240 | BUILD_BUG_ON((int)BPF_TCP_CLOSE != (int)TCP_CLOSE); | |
2241 | BUILD_BUG_ON((int)BPF_TCP_CLOSE_WAIT != (int)TCP_CLOSE_WAIT); | |
2242 | BUILD_BUG_ON((int)BPF_TCP_LAST_ACK != (int)TCP_LAST_ACK); | |
2243 | BUILD_BUG_ON((int)BPF_TCP_LISTEN != (int)TCP_LISTEN); | |
2244 | BUILD_BUG_ON((int)BPF_TCP_CLOSING != (int)TCP_CLOSING); | |
2245 | BUILD_BUG_ON((int)BPF_TCP_NEW_SYN_RECV != (int)TCP_NEW_SYN_RECV); | |
2246 | BUILD_BUG_ON((int)BPF_TCP_MAX_STATES != (int)TCP_MAX_STATES); | |
2247 | ||
2248 | if (BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk), BPF_SOCK_OPS_STATE_CB_FLAG)) | |
2249 | tcp_call_bpf_2arg(sk, BPF_SOCK_OPS_STATE_CB, oldstate, state); | |
e8fce239 | 2250 | |
490d5046 IJ |
2251 | switch (state) { |
2252 | case TCP_ESTABLISHED: | |
2253 | if (oldstate != TCP_ESTABLISHED) | |
81cc8a75 | 2254 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2255 | break; |
2256 | ||
2257 | case TCP_CLOSE: | |
2258 | if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) | |
81cc8a75 | 2259 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ESTABRESETS); |
490d5046 IJ |
2260 | |
2261 | sk->sk_prot->unhash(sk); | |
2262 | if (inet_csk(sk)->icsk_bind_hash && | |
2263 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 2264 | inet_put_port(sk); |
a8eceea8 | 2265 | fallthrough; |
490d5046 | 2266 | default: |
5a5f3a8d | 2267 | if (oldstate == TCP_ESTABLISHED) |
74688e48 | 2268 | TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2269 | } |
2270 | ||
2271 | /* Change state AFTER socket is unhashed to avoid closed | |
2272 | * socket sitting in hash tables. | |
2273 | */ | |
563e0bb0 | 2274 | inet_sk_state_store(sk, state); |
490d5046 IJ |
2275 | } |
2276 | EXPORT_SYMBOL_GPL(tcp_set_state); | |
2277 | ||
1da177e4 LT |
2278 | /* |
2279 | * State processing on a close. This implements the state shift for | |
2280 | * sending our FIN frame. Note that we only send a FIN for some | |
2281 | * states. A shutdown() may have already sent the FIN, or we may be | |
2282 | * closed. | |
2283 | */ | |
2284 | ||
9b5b5cff | 2285 | static const unsigned char new_state[16] = { |
1da177e4 | 2286 | /* current state: new state: action: */ |
0980c1e3 ED |
2287 | [0 /* (Invalid) */] = TCP_CLOSE, |
2288 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2289 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2290 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2291 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2292 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2293 | [TCP_TIME_WAIT] = TCP_CLOSE, | |
2294 | [TCP_CLOSE] = TCP_CLOSE, | |
2295 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2296 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2297 | [TCP_LISTEN] = TCP_CLOSE, | |
2298 | [TCP_CLOSING] = TCP_CLOSING, | |
2299 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
1da177e4 LT |
2300 | }; |
2301 | ||
2302 | static int tcp_close_state(struct sock *sk) | |
2303 | { | |
2304 | int next = (int)new_state[sk->sk_state]; | |
2305 | int ns = next & TCP_STATE_MASK; | |
2306 | ||
2307 | tcp_set_state(sk, ns); | |
2308 | ||
2309 | return next & TCP_ACTION_FIN; | |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * Shutdown the sending side of a connection. Much like close except | |
1f29b058 | 2314 | * that we don't receive shut down or sock_set_flag(sk, SOCK_DEAD). |
1da177e4 LT |
2315 | */ |
2316 | ||
2317 | void tcp_shutdown(struct sock *sk, int how) | |
2318 | { | |
2319 | /* We need to grab some memory, and put together a FIN, | |
2320 | * and then put it into the queue to be sent. | |
2321 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. | |
2322 | */ | |
2323 | if (!(how & SEND_SHUTDOWN)) | |
2324 | return; | |
2325 | ||
2326 | /* If we've already sent a FIN, or it's a closed state, skip this. */ | |
2327 | if ((1 << sk->sk_state) & | |
2328 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | | |
2329 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { | |
2330 | /* Clear out any half completed packets. FIN if needed. */ | |
2331 | if (tcp_close_state(sk)) | |
2332 | tcp_send_fin(sk); | |
2333 | } | |
2334 | } | |
4bc2f18b | 2335 | EXPORT_SYMBOL(tcp_shutdown); |
1da177e4 | 2336 | |
efcdbf24 AS |
2337 | bool tcp_check_oom(struct sock *sk, int shift) |
2338 | { | |
2339 | bool too_many_orphans, out_of_socket_memory; | |
2340 | ||
2341 | too_many_orphans = tcp_too_many_orphans(sk, shift); | |
2342 | out_of_socket_memory = tcp_out_of_memory(sk); | |
2343 | ||
e87cc472 JP |
2344 | if (too_many_orphans) |
2345 | net_info_ratelimited("too many orphaned sockets\n"); | |
2346 | if (out_of_socket_memory) | |
2347 | net_info_ratelimited("out of memory -- consider tuning tcp_mem\n"); | |
efcdbf24 AS |
2348 | return too_many_orphans || out_of_socket_memory; |
2349 | } | |
2350 | ||
1da177e4 LT |
2351 | void tcp_close(struct sock *sk, long timeout) |
2352 | { | |
2353 | struct sk_buff *skb; | |
2354 | int data_was_unread = 0; | |
75c2d907 | 2355 | int state; |
1da177e4 LT |
2356 | |
2357 | lock_sock(sk); | |
2358 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2359 | ||
2360 | if (sk->sk_state == TCP_LISTEN) { | |
2361 | tcp_set_state(sk, TCP_CLOSE); | |
2362 | ||
2363 | /* Special case. */ | |
0a5578cf | 2364 | inet_csk_listen_stop(sk); |
1da177e4 LT |
2365 | |
2366 | goto adjudge_to_death; | |
2367 | } | |
2368 | ||
2369 | /* We need to flush the recv. buffs. We do this only on the | |
2370 | * descriptor close, not protocol-sourced closes, because the | |
2371 | * reader process may not have drained the data yet! | |
2372 | */ | |
2373 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e11ecddf ED |
2374 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq; |
2375 | ||
2376 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) | |
2377 | len--; | |
1da177e4 LT |
2378 | data_was_unread += len; |
2379 | __kfree_skb(skb); | |
2380 | } | |
2381 | ||
3ab224be | 2382 | sk_mem_reclaim(sk); |
1da177e4 | 2383 | |
565b7b2d KK |
2384 | /* If socket has been already reset (e.g. in tcp_reset()) - kill it. */ |
2385 | if (sk->sk_state == TCP_CLOSE) | |
2386 | goto adjudge_to_death; | |
2387 | ||
65bb723c GR |
2388 | /* As outlined in RFC 2525, section 2.17, we send a RST here because |
2389 | * data was lost. To witness the awful effects of the old behavior of | |
2390 | * always doing a FIN, run an older 2.1.x kernel or 2.0.x, start a bulk | |
2391 | * GET in an FTP client, suspend the process, wait for the client to | |
2392 | * advertise a zero window, then kill -9 the FTP client, wheee... | |
2393 | * Note: timeout is always zero in such a case. | |
1da177e4 | 2394 | */ |
ee995283 PE |
2395 | if (unlikely(tcp_sk(sk)->repair)) { |
2396 | sk->sk_prot->disconnect(sk, 0); | |
2397 | } else if (data_was_unread) { | |
1da177e4 | 2398 | /* Unread data was tossed, zap the connection. */ |
6aef70a8 | 2399 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE); |
1da177e4 | 2400 | tcp_set_state(sk, TCP_CLOSE); |
aa133076 | 2401 | tcp_send_active_reset(sk, sk->sk_allocation); |
1da177e4 LT |
2402 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
2403 | /* Check zero linger _after_ checking for unread data. */ | |
2404 | sk->sk_prot->disconnect(sk, 0); | |
6aef70a8 | 2405 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA); |
1da177e4 LT |
2406 | } else if (tcp_close_state(sk)) { |
2407 | /* We FIN if the application ate all the data before | |
2408 | * zapping the connection. | |
2409 | */ | |
2410 | ||
2411 | /* RED-PEN. Formally speaking, we have broken TCP state | |
2412 | * machine. State transitions: | |
2413 | * | |
2414 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 | |
2415 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) | |
2416 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK | |
2417 | * | |
2418 | * are legal only when FIN has been sent (i.e. in window), | |
2419 | * rather than queued out of window. Purists blame. | |
2420 | * | |
2421 | * F.e. "RFC state" is ESTABLISHED, | |
2422 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. | |
2423 | * | |
2424 | * The visible declinations are that sometimes | |
2425 | * we enter time-wait state, when it is not required really | |
2426 | * (harmless), do not send active resets, when they are | |
2427 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when | |
2428 | * they look as CLOSING or LAST_ACK for Linux) | |
2429 | * Probably, I missed some more holelets. | |
2430 | * --ANK | |
8336886f JC |
2431 | * XXX (TFO) - To start off we don't support SYN+ACK+FIN |
2432 | * in a single packet! (May consider it later but will | |
2433 | * probably need API support or TCP_CORK SYN-ACK until | |
2434 | * data is written and socket is closed.) | |
1da177e4 LT |
2435 | */ |
2436 | tcp_send_fin(sk); | |
2437 | } | |
2438 | ||
2439 | sk_stream_wait_close(sk, timeout); | |
2440 | ||
2441 | adjudge_to_death: | |
75c2d907 HX |
2442 | state = sk->sk_state; |
2443 | sock_hold(sk); | |
2444 | sock_orphan(sk); | |
75c2d907 | 2445 | |
1da177e4 LT |
2446 | local_bh_disable(); |
2447 | bh_lock_sock(sk); | |
8873c064 ED |
2448 | /* remove backlog if any, without releasing ownership. */ |
2449 | __release_sock(sk); | |
1da177e4 | 2450 | |
eb4dea58 HX |
2451 | percpu_counter_inc(sk->sk_prot->orphan_count); |
2452 | ||
75c2d907 HX |
2453 | /* Have we already been destroyed by a softirq or backlog? */ |
2454 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) | |
2455 | goto out; | |
1da177e4 LT |
2456 | |
2457 | /* This is a (useful) BSD violating of the RFC. There is a | |
2458 | * problem with TCP as specified in that the other end could | |
2459 | * keep a socket open forever with no application left this end. | |
b10bd54c | 2460 | * We use a 1 minute timeout (about the same as BSD) then kill |
1da177e4 LT |
2461 | * our end. If they send after that then tough - BUT: long enough |
2462 | * that we won't make the old 4*rto = almost no time - whoops | |
2463 | * reset mistake. | |
2464 | * | |
2465 | * Nope, it was not mistake. It is really desired behaviour | |
2466 | * f.e. on http servers, when such sockets are useless, but | |
2467 | * consume significant resources. Let's do it with special | |
2468 | * linger2 option. --ANK | |
2469 | */ | |
2470 | ||
2471 | if (sk->sk_state == TCP_FIN_WAIT2) { | |
2472 | struct tcp_sock *tp = tcp_sk(sk); | |
2473 | if (tp->linger2 < 0) { | |
2474 | tcp_set_state(sk, TCP_CLOSE); | |
2475 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 2476 | __NET_INC_STATS(sock_net(sk), |
de0744af | 2477 | LINUX_MIB_TCPABORTONLINGER); |
1da177e4 | 2478 | } else { |
463c84b9 | 2479 | const int tmo = tcp_fin_time(sk); |
1da177e4 LT |
2480 | |
2481 | if (tmo > TCP_TIMEWAIT_LEN) { | |
52499afe DM |
2482 | inet_csk_reset_keepalive_timer(sk, |
2483 | tmo - TCP_TIMEWAIT_LEN); | |
1da177e4 | 2484 | } else { |
1da177e4 LT |
2485 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
2486 | goto out; | |
2487 | } | |
2488 | } | |
2489 | } | |
2490 | if (sk->sk_state != TCP_CLOSE) { | |
3ab224be | 2491 | sk_mem_reclaim(sk); |
efcdbf24 | 2492 | if (tcp_check_oom(sk, 0)) { |
1da177e4 LT |
2493 | tcp_set_state(sk, TCP_CLOSE); |
2494 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 2495 | __NET_INC_STATS(sock_net(sk), |
de0744af | 2496 | LINUX_MIB_TCPABORTONMEMORY); |
4ee806d5 DS |
2497 | } else if (!check_net(sock_net(sk))) { |
2498 | /* Not possible to send reset; just close */ | |
2499 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 LT |
2500 | } |
2501 | } | |
1da177e4 | 2502 | |
8336886f | 2503 | if (sk->sk_state == TCP_CLOSE) { |
d983ea6f ED |
2504 | struct request_sock *req; |
2505 | ||
2506 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, | |
2507 | lockdep_sock_is_held(sk)); | |
8336886f JC |
2508 | /* We could get here with a non-NULL req if the socket is |
2509 | * aborted (e.g., closed with unread data) before 3WHS | |
2510 | * finishes. | |
2511 | */ | |
00db4124 | 2512 | if (req) |
8336886f | 2513 | reqsk_fastopen_remove(sk, req, false); |
0a5578cf | 2514 | inet_csk_destroy_sock(sk); |
8336886f | 2515 | } |
1da177e4 LT |
2516 | /* Otherwise, socket is reprieved until protocol close. */ |
2517 | ||
2518 | out: | |
2519 | bh_unlock_sock(sk); | |
2520 | local_bh_enable(); | |
8873c064 | 2521 | release_sock(sk); |
1da177e4 LT |
2522 | sock_put(sk); |
2523 | } | |
4bc2f18b | 2524 | EXPORT_SYMBOL(tcp_close); |
1da177e4 LT |
2525 | |
2526 | /* These states need RST on ABORT according to RFC793 */ | |
2527 | ||
a2a385d6 | 2528 | static inline bool tcp_need_reset(int state) |
1da177e4 LT |
2529 | { |
2530 | return (1 << state) & | |
2531 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | | |
2532 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); | |
2533 | } | |
2534 | ||
75c119af ED |
2535 | static void tcp_rtx_queue_purge(struct sock *sk) |
2536 | { | |
2537 | struct rb_node *p = rb_first(&sk->tcp_rtx_queue); | |
2538 | ||
2bec445f | 2539 | tcp_sk(sk)->highest_sack = NULL; |
75c119af ED |
2540 | while (p) { |
2541 | struct sk_buff *skb = rb_to_skb(p); | |
2542 | ||
2543 | p = rb_next(p); | |
2544 | /* Since we are deleting whole queue, no need to | |
2545 | * list_del(&skb->tcp_tsorted_anchor) | |
2546 | */ | |
2547 | tcp_rtx_queue_unlink(skb, sk); | |
2548 | sk_wmem_free_skb(sk, skb); | |
2549 | } | |
2550 | } | |
2551 | ||
ac3f09ba ED |
2552 | void tcp_write_queue_purge(struct sock *sk) |
2553 | { | |
2554 | struct sk_buff *skb; | |
2555 | ||
2556 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
2557 | while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
2558 | tcp_skb_tsorted_anchor_cleanup(skb); | |
2559 | sk_wmem_free_skb(sk, skb); | |
2560 | } | |
75c119af | 2561 | tcp_rtx_queue_purge(sk); |
472c2e07 ED |
2562 | skb = sk->sk_tx_skb_cache; |
2563 | if (skb) { | |
472c2e07 ED |
2564 | __kfree_skb(skb); |
2565 | sk->sk_tx_skb_cache = NULL; | |
2566 | } | |
ac3f09ba ED |
2567 | INIT_LIST_HEAD(&tcp_sk(sk)->tsorted_sent_queue); |
2568 | sk_mem_reclaim(sk); | |
2569 | tcp_clear_all_retrans_hints(tcp_sk(sk)); | |
bffd168c | 2570 | tcp_sk(sk)->packets_out = 0; |
04c03114 | 2571 | inet_csk(sk)->icsk_backoff = 0; |
ac3f09ba ED |
2572 | } |
2573 | ||
1da177e4 LT |
2574 | int tcp_disconnect(struct sock *sk, int flags) |
2575 | { | |
2576 | struct inet_sock *inet = inet_sk(sk); | |
463c84b9 | 2577 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 2578 | struct tcp_sock *tp = tcp_sk(sk); |
1da177e4 | 2579 | int old_state = sk->sk_state; |
0f317464 | 2580 | u32 seq; |
1da177e4 LT |
2581 | |
2582 | if (old_state != TCP_CLOSE) | |
2583 | tcp_set_state(sk, TCP_CLOSE); | |
2584 | ||
2585 | /* ABORT function of RFC793 */ | |
2586 | if (old_state == TCP_LISTEN) { | |
0a5578cf | 2587 | inet_csk_listen_stop(sk); |
ee995283 PE |
2588 | } else if (unlikely(tp->repair)) { |
2589 | sk->sk_err = ECONNABORTED; | |
1da177e4 LT |
2590 | } else if (tcp_need_reset(old_state) || |
2591 | (tp->snd_nxt != tp->write_seq && | |
2592 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { | |
caa20d9a | 2593 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
1da177e4 LT |
2594 | * states |
2595 | */ | |
2596 | tcp_send_active_reset(sk, gfp_any()); | |
2597 | sk->sk_err = ECONNRESET; | |
2598 | } else if (old_state == TCP_SYN_SENT) | |
2599 | sk->sk_err = ECONNRESET; | |
2600 | ||
2601 | tcp_clear_xmit_timers(sk); | |
2602 | __skb_queue_purge(&sk->sk_receive_queue); | |
8b27dae5 ED |
2603 | if (sk->sk_rx_skb_cache) { |
2604 | __kfree_skb(sk->sk_rx_skb_cache); | |
2605 | sk->sk_rx_skb_cache = NULL; | |
2606 | } | |
7db48e98 | 2607 | WRITE_ONCE(tp->copied_seq, tp->rcv_nxt); |
6508b678 | 2608 | tp->urg_data = 0; |
fe067e8a | 2609 | tcp_write_queue_purge(sk); |
cf1ef3f0 | 2610 | tcp_fastopen_active_disable_ofo_check(sk); |
9f5afeae | 2611 | skb_rbtree_purge(&tp->out_of_order_queue); |
1da177e4 | 2612 | |
c720c7e8 | 2613 | inet->inet_dport = 0; |
1da177e4 LT |
2614 | |
2615 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
2616 | inet_reset_saddr(sk); | |
2617 | ||
2618 | sk->sk_shutdown = 0; | |
2619 | sock_reset_flag(sk, SOCK_DONE); | |
740b0f18 | 2620 | tp->srtt_us = 0; |
b9e2e689 | 2621 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
3f6c65d6 | 2622 | tp->rcv_rtt_last_tsecr = 0; |
0f317464 ED |
2623 | |
2624 | seq = tp->write_seq + tp->max_window + 2; | |
2625 | if (!seq) | |
2626 | seq = 1; | |
2627 | WRITE_ONCE(tp->write_seq, seq); | |
2628 | ||
463c84b9 | 2629 | icsk->icsk_backoff = 0; |
6687e988 | 2630 | icsk->icsk_probes_out = 0; |
6a408147 | 2631 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
0b6a05c1 | 2632 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
3a9a57f6 | 2633 | tp->snd_cwnd = TCP_INIT_CWND; |
1da177e4 | 2634 | tp->snd_cwnd_cnt = 0; |
1fdf475a | 2635 | tp->window_clamp = 0; |
2fbdd562 | 2636 | tp->delivered = 0; |
e21db6f6 | 2637 | tp->delivered_ce = 0; |
6687e988 | 2638 | tcp_set_ca_state(sk, TCP_CA_Open); |
d4761754 | 2639 | tp->is_sack_reneg = 0; |
1da177e4 | 2640 | tcp_clear_retrans(tp); |
c13c48c0 | 2641 | tp->total_retrans = 0; |
463c84b9 | 2642 | inet_csk_delack_init(sk); |
499350a5 WW |
2643 | /* Initialize rcv_mss to TCP_MIN_MSS to avoid division by 0 |
2644 | * issue in __tcp_select_window() | |
2645 | */ | |
2646 | icsk->icsk_ack.rcv_mss = TCP_MIN_MSS; | |
b40b4f79 | 2647 | memset(&tp->rx_opt, 0, sizeof(tp->rx_opt)); |
1da177e4 | 2648 | __sk_dst_reset(sk); |
d747a7a5 WC |
2649 | dst_release(sk->sk_rx_dst); |
2650 | sk->sk_rx_dst = NULL; | |
17c3060b | 2651 | tcp_saved_syn_free(tp); |
5d9f4262 | 2652 | tp->compressed_ack = 0; |
784f8344 ED |
2653 | tp->segs_in = 0; |
2654 | tp->segs_out = 0; | |
ba113c3a | 2655 | tp->bytes_sent = 0; |
e858faf5 CP |
2656 | tp->bytes_acked = 0; |
2657 | tp->bytes_received = 0; | |
fb31c9b9 | 2658 | tp->bytes_retrans = 0; |
db7ffee6 ED |
2659 | tp->data_segs_in = 0; |
2660 | tp->data_segs_out = 0; | |
7788174e YC |
2661 | tp->duplicate_sack[0].start_seq = 0; |
2662 | tp->duplicate_sack[0].end_seq = 0; | |
7e10b655 | 2663 | tp->dsack_dups = 0; |
7ec65372 | 2664 | tp->reord_seen = 0; |
5c701549 ED |
2665 | tp->retrans_out = 0; |
2666 | tp->sacked_out = 0; | |
2667 | tp->tlp_high_seq = 0; | |
2668 | tp->last_oow_ack_time = 0; | |
6cda8b74 ED |
2669 | /* There's a bubble in the pipe until at least the first ACK. */ |
2670 | tp->app_limited = ~0U; | |
792c4354 ED |
2671 | tp->rack.mstamp = 0; |
2672 | tp->rack.advanced = 0; | |
2673 | tp->rack.reo_wnd_steps = 1; | |
2674 | tp->rack.last_delivered = 0; | |
2675 | tp->rack.reo_wnd_persist = 0; | |
2676 | tp->rack.dsack_seen = 0; | |
6bcdc40d ED |
2677 | tp->syn_data_acked = 0; |
2678 | tp->rx_opt.saw_tstamp = 0; | |
2679 | tp->rx_opt.dsack = 0; | |
2680 | tp->rx_opt.num_sacks = 0; | |
f9af2dbb | 2681 | tp->rcv_ooopack = 0; |
6cda8b74 | 2682 | |
1da177e4 | 2683 | |
7db92362 WW |
2684 | /* Clean up fastopen related fields */ |
2685 | tcp_free_fastopen_req(tp); | |
2686 | inet->defer_connect = 0; | |
48027478 | 2687 | tp->fastopen_client_fail = 0; |
7db92362 | 2688 | |
c720c7e8 | 2689 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
1da177e4 | 2690 | |
9b42d55a LR |
2691 | if (sk->sk_frag.page) { |
2692 | put_page(sk->sk_frag.page); | |
2693 | sk->sk_frag.page = NULL; | |
2694 | sk->sk_frag.offset = 0; | |
2695 | } | |
2696 | ||
1da177e4 | 2697 | sk->sk_error_report(sk); |
a01512b1 | 2698 | return 0; |
1da177e4 | 2699 | } |
4bc2f18b | 2700 | EXPORT_SYMBOL(tcp_disconnect); |
1da177e4 | 2701 | |
a2a385d6 | 2702 | static inline bool tcp_can_repair_sock(const struct sock *sk) |
ee995283 | 2703 | { |
52e804c6 | 2704 | return ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) && |
319b0534 | 2705 | (sk->sk_state != TCP_LISTEN); |
ee995283 PE |
2706 | } |
2707 | ||
b1ed4c4f AV |
2708 | static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int len) |
2709 | { | |
2710 | struct tcp_repair_window opt; | |
2711 | ||
2712 | if (!tp->repair) | |
2713 | return -EPERM; | |
2714 | ||
2715 | if (len != sizeof(opt)) | |
2716 | return -EINVAL; | |
2717 | ||
2718 | if (copy_from_user(&opt, optbuf, sizeof(opt))) | |
2719 | return -EFAULT; | |
2720 | ||
2721 | if (opt.max_window < opt.snd_wnd) | |
2722 | return -EINVAL; | |
2723 | ||
2724 | if (after(opt.snd_wl1, tp->rcv_nxt + opt.rcv_wnd)) | |
2725 | return -EINVAL; | |
2726 | ||
2727 | if (after(opt.rcv_wup, tp->rcv_nxt)) | |
2728 | return -EINVAL; | |
2729 | ||
2730 | tp->snd_wl1 = opt.snd_wl1; | |
2731 | tp->snd_wnd = opt.snd_wnd; | |
2732 | tp->max_window = opt.max_window; | |
2733 | ||
2734 | tp->rcv_wnd = opt.rcv_wnd; | |
2735 | tp->rcv_wup = opt.rcv_wup; | |
2736 | ||
2737 | return 0; | |
2738 | } | |
2739 | ||
15e56515 | 2740 | static int tcp_repair_options_est(struct sock *sk, |
de248a75 | 2741 | struct tcp_repair_opt __user *optbuf, unsigned int len) |
b139ba4e | 2742 | { |
15e56515 | 2743 | struct tcp_sock *tp = tcp_sk(sk); |
de248a75 | 2744 | struct tcp_repair_opt opt; |
b139ba4e | 2745 | |
de248a75 PE |
2746 | while (len >= sizeof(opt)) { |
2747 | if (copy_from_user(&opt, optbuf, sizeof(opt))) | |
b139ba4e PE |
2748 | return -EFAULT; |
2749 | ||
2750 | optbuf++; | |
de248a75 | 2751 | len -= sizeof(opt); |
b139ba4e | 2752 | |
de248a75 PE |
2753 | switch (opt.opt_code) { |
2754 | case TCPOPT_MSS: | |
2755 | tp->rx_opt.mss_clamp = opt.opt_val; | |
15e56515 | 2756 | tcp_mtup_init(sk); |
b139ba4e | 2757 | break; |
de248a75 | 2758 | case TCPOPT_WINDOW: |
bc26ccd8 AV |
2759 | { |
2760 | u16 snd_wscale = opt.opt_val & 0xFFFF; | |
2761 | u16 rcv_wscale = opt.opt_val >> 16; | |
2762 | ||
589c49cb | 2763 | if (snd_wscale > TCP_MAX_WSCALE || rcv_wscale > TCP_MAX_WSCALE) |
bc26ccd8 | 2764 | return -EFBIG; |
b139ba4e | 2765 | |
bc26ccd8 AV |
2766 | tp->rx_opt.snd_wscale = snd_wscale; |
2767 | tp->rx_opt.rcv_wscale = rcv_wscale; | |
2768 | tp->rx_opt.wscale_ok = 1; | |
2769 | } | |
b139ba4e | 2770 | break; |
b139ba4e | 2771 | case TCPOPT_SACK_PERM: |
de248a75 PE |
2772 | if (opt.opt_val != 0) |
2773 | return -EINVAL; | |
2774 | ||
b139ba4e | 2775 | tp->rx_opt.sack_ok |= TCP_SACK_SEEN; |
b139ba4e PE |
2776 | break; |
2777 | case TCPOPT_TIMESTAMP: | |
de248a75 PE |
2778 | if (opt.opt_val != 0) |
2779 | return -EINVAL; | |
2780 | ||
b139ba4e PE |
2781 | tp->rx_opt.tstamp_ok = 1; |
2782 | break; | |
2783 | } | |
2784 | } | |
2785 | ||
2786 | return 0; | |
2787 | } | |
2788 | ||
a842fe14 ED |
2789 | DEFINE_STATIC_KEY_FALSE(tcp_tx_delay_enabled); |
2790 | EXPORT_SYMBOL(tcp_tx_delay_enabled); | |
2791 | ||
2792 | static void tcp_enable_tx_delay(void) | |
2793 | { | |
2794 | if (!static_branch_unlikely(&tcp_tx_delay_enabled)) { | |
2795 | static int __tcp_tx_delay_enabled = 0; | |
2796 | ||
2797 | if (cmpxchg(&__tcp_tx_delay_enabled, 0, 1) == 0) { | |
2798 | static_branch_enable(&tcp_tx_delay_enabled); | |
2799 | pr_info("TCP_TX_DELAY enabled\n"); | |
2800 | } | |
2801 | } | |
2802 | } | |
2803 | ||
1da177e4 LT |
2804 | /* |
2805 | * Socket option code for TCP. | |
2806 | */ | |
3fdadf7d | 2807 | static int do_tcp_setsockopt(struct sock *sk, int level, |
b7058842 | 2808 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2809 | { |
2810 | struct tcp_sock *tp = tcp_sk(sk); | |
463c84b9 | 2811 | struct inet_connection_sock *icsk = inet_csk(sk); |
1e579caa | 2812 | struct net *net = sock_net(sk); |
1da177e4 LT |
2813 | int val; |
2814 | int err = 0; | |
2815 | ||
e56fb50f WAS |
2816 | /* These are data/string values, all the others are ints */ |
2817 | switch (optname) { | |
2818 | case TCP_CONGESTION: { | |
5f8ef48d SH |
2819 | char name[TCP_CA_NAME_MAX]; |
2820 | ||
2821 | if (optlen < 1) | |
2822 | return -EINVAL; | |
2823 | ||
2824 | val = strncpy_from_user(name, optval, | |
4fdb78d3 | 2825 | min_t(long, TCP_CA_NAME_MAX-1, optlen)); |
5f8ef48d SH |
2826 | if (val < 0) |
2827 | return -EFAULT; | |
2828 | name[val] = 0; | |
2829 | ||
2830 | lock_sock(sk); | |
8d650cde ED |
2831 | err = tcp_set_congestion_control(sk, name, true, true, |
2832 | ns_capable(sock_net(sk)->user_ns, | |
2833 | CAP_NET_ADMIN)); | |
5f8ef48d SH |
2834 | release_sock(sk); |
2835 | return err; | |
2836 | } | |
734942cc DW |
2837 | case TCP_ULP: { |
2838 | char name[TCP_ULP_NAME_MAX]; | |
2839 | ||
2840 | if (optlen < 1) | |
2841 | return -EINVAL; | |
2842 | ||
2843 | val = strncpy_from_user(name, optval, | |
2844 | min_t(long, TCP_ULP_NAME_MAX - 1, | |
2845 | optlen)); | |
2846 | if (val < 0) | |
2847 | return -EFAULT; | |
2848 | name[val] = 0; | |
2849 | ||
2850 | lock_sock(sk); | |
2851 | err = tcp_set_ulp(sk, name); | |
2852 | release_sock(sk); | |
2853 | return err; | |
2854 | } | |
1fba70e5 | 2855 | case TCP_FASTOPEN_KEY: { |
0f1ce023 JB |
2856 | __u8 key[TCP_FASTOPEN_KEY_BUF_LENGTH]; |
2857 | __u8 *backup_key = NULL; | |
1fba70e5 | 2858 | |
0f1ce023 JB |
2859 | /* Allow a backup key as well to facilitate key rotation |
2860 | * First key is the active one. | |
2861 | */ | |
2862 | if (optlen != TCP_FASTOPEN_KEY_LENGTH && | |
2863 | optlen != TCP_FASTOPEN_KEY_BUF_LENGTH) | |
1fba70e5 YC |
2864 | return -EINVAL; |
2865 | ||
2866 | if (copy_from_user(key, optval, optlen)) | |
2867 | return -EFAULT; | |
2868 | ||
0f1ce023 JB |
2869 | if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH) |
2870 | backup_key = key + TCP_FASTOPEN_KEY_LENGTH; | |
2871 | ||
438ac880 | 2872 | return tcp_fastopen_reset_cipher(net, sk, key, backup_key); |
1fba70e5 | 2873 | } |
e56fb50f WAS |
2874 | default: |
2875 | /* fallthru */ | |
2876 | break; | |
ccbd6a5a | 2877 | } |
5f8ef48d | 2878 | |
1da177e4 LT |
2879 | if (optlen < sizeof(int)) |
2880 | return -EINVAL; | |
2881 | ||
2882 | if (get_user(val, (int __user *)optval)) | |
2883 | return -EFAULT; | |
2884 | ||
2885 | lock_sock(sk); | |
2886 | ||
2887 | switch (optname) { | |
2888 | case TCP_MAXSEG: | |
2889 | /* Values greater than interface MTU won't take effect. However | |
2890 | * at the point when this call is done we typically don't yet | |
a777f715 RC |
2891 | * know which interface is going to be used |
2892 | */ | |
cfc62d87 | 2893 | if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) { |
1da177e4 LT |
2894 | err = -EINVAL; |
2895 | break; | |
2896 | } | |
2897 | tp->rx_opt.user_mss = val; | |
2898 | break; | |
2899 | ||
2900 | case TCP_NODELAY: | |
2901 | if (val) { | |
2902 | /* TCP_NODELAY is weaker than TCP_CORK, so that | |
2903 | * this option on corked socket is remembered, but | |
2904 | * it is not activated until cork is cleared. | |
2905 | * | |
2906 | * However, when TCP_NODELAY is set we make | |
2907 | * an explicit push, which overrides even TCP_CORK | |
2908 | * for currently queued segments. | |
2909 | */ | |
2910 | tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; | |
9e412ba7 | 2911 | tcp_push_pending_frames(sk); |
1da177e4 LT |
2912 | } else { |
2913 | tp->nonagle &= ~TCP_NAGLE_OFF; | |
2914 | } | |
2915 | break; | |
2916 | ||
36e31b0a AP |
2917 | case TCP_THIN_LINEAR_TIMEOUTS: |
2918 | if (val < 0 || val > 1) | |
2919 | err = -EINVAL; | |
2920 | else | |
2921 | tp->thin_lto = val; | |
2922 | break; | |
2923 | ||
7e380175 AP |
2924 | case TCP_THIN_DUPACK: |
2925 | if (val < 0 || val > 1) | |
2926 | err = -EINVAL; | |
7e380175 AP |
2927 | break; |
2928 | ||
ee995283 PE |
2929 | case TCP_REPAIR: |
2930 | if (!tcp_can_repair_sock(sk)) | |
2931 | err = -EPERM; | |
31048d7a | 2932 | else if (val == TCP_REPAIR_ON) { |
ee995283 PE |
2933 | tp->repair = 1; |
2934 | sk->sk_reuse = SK_FORCE_REUSE; | |
2935 | tp->repair_queue = TCP_NO_QUEUE; | |
31048d7a | 2936 | } else if (val == TCP_REPAIR_OFF) { |
ee995283 PE |
2937 | tp->repair = 0; |
2938 | sk->sk_reuse = SK_NO_REUSE; | |
2939 | tcp_send_window_probe(sk); | |
31048d7a | 2940 | } else if (val == TCP_REPAIR_OFF_NO_WP) { |
ee995283 PE |
2941 | tp->repair = 0; |
2942 | sk->sk_reuse = SK_NO_REUSE; | |
ee995283 PE |
2943 | } else |
2944 | err = -EINVAL; | |
2945 | ||
2946 | break; | |
2947 | ||
2948 | case TCP_REPAIR_QUEUE: | |
2949 | if (!tp->repair) | |
2950 | err = -EPERM; | |
bf2acc94 | 2951 | else if ((unsigned int)val < TCP_QUEUES_NR) |
ee995283 PE |
2952 | tp->repair_queue = val; |
2953 | else | |
2954 | err = -EINVAL; | |
2955 | break; | |
2956 | ||
2957 | case TCP_QUEUE_SEQ: | |
2958 | if (sk->sk_state != TCP_CLOSE) | |
2959 | err = -EPERM; | |
2960 | else if (tp->repair_queue == TCP_SEND_QUEUE) | |
0f317464 | 2961 | WRITE_ONCE(tp->write_seq, val); |
6cd6cbf5 | 2962 | else if (tp->repair_queue == TCP_RECV_QUEUE) { |
dba7d9b8 | 2963 | WRITE_ONCE(tp->rcv_nxt, val); |
6cd6cbf5 ED |
2964 | WRITE_ONCE(tp->copied_seq, val); |
2965 | } | |
ee995283 PE |
2966 | else |
2967 | err = -EINVAL; | |
2968 | break; | |
2969 | ||
b139ba4e PE |
2970 | case TCP_REPAIR_OPTIONS: |
2971 | if (!tp->repair) | |
2972 | err = -EINVAL; | |
2973 | else if (sk->sk_state == TCP_ESTABLISHED) | |
15e56515 | 2974 | err = tcp_repair_options_est(sk, |
de248a75 PE |
2975 | (struct tcp_repair_opt __user *)optval, |
2976 | optlen); | |
b139ba4e PE |
2977 | else |
2978 | err = -EPERM; | |
2979 | break; | |
2980 | ||
1da177e4 LT |
2981 | case TCP_CORK: |
2982 | /* When set indicates to always queue non-full frames. | |
2983 | * Later the user clears this option and we transmit | |
2984 | * any pending partial frames in the queue. This is | |
2985 | * meant to be used alongside sendfile() to get properly | |
2986 | * filled frames when the user (for example) must write | |
2987 | * out headers with a write() call first and then use | |
2988 | * sendfile to send out the data parts. | |
2989 | * | |
2990 | * TCP_CORK can be set together with TCP_NODELAY and it is | |
2991 | * stronger than TCP_NODELAY. | |
2992 | */ | |
2993 | if (val) { | |
2994 | tp->nonagle |= TCP_NAGLE_CORK; | |
2995 | } else { | |
2996 | tp->nonagle &= ~TCP_NAGLE_CORK; | |
2997 | if (tp->nonagle&TCP_NAGLE_OFF) | |
2998 | tp->nonagle |= TCP_NAGLE_PUSH; | |
9e412ba7 | 2999 | tcp_push_pending_frames(sk); |
1da177e4 LT |
3000 | } |
3001 | break; | |
3002 | ||
3003 | case TCP_KEEPIDLE: | |
3004 | if (val < 1 || val > MAX_TCP_KEEPIDLE) | |
3005 | err = -EINVAL; | |
3006 | else { | |
3007 | tp->keepalive_time = val * HZ; | |
3008 | if (sock_flag(sk, SOCK_KEEPOPEN) && | |
3009 | !((1 << sk->sk_state) & | |
3010 | (TCPF_CLOSE | TCPF_LISTEN))) { | |
6c37e5de | 3011 | u32 elapsed = keepalive_time_elapsed(tp); |
1da177e4 LT |
3012 | if (tp->keepalive_time > elapsed) |
3013 | elapsed = tp->keepalive_time - elapsed; | |
3014 | else | |
3015 | elapsed = 0; | |
463c84b9 | 3016 | inet_csk_reset_keepalive_timer(sk, elapsed); |
1da177e4 LT |
3017 | } |
3018 | } | |
3019 | break; | |
3020 | case TCP_KEEPINTVL: | |
3021 | if (val < 1 || val > MAX_TCP_KEEPINTVL) | |
3022 | err = -EINVAL; | |
3023 | else | |
3024 | tp->keepalive_intvl = val * HZ; | |
3025 | break; | |
3026 | case TCP_KEEPCNT: | |
3027 | if (val < 1 || val > MAX_TCP_KEEPCNT) | |
3028 | err = -EINVAL; | |
3029 | else | |
3030 | tp->keepalive_probes = val; | |
3031 | break; | |
3032 | case TCP_SYNCNT: | |
3033 | if (val < 1 || val > MAX_TCP_SYNCNT) | |
3034 | err = -EINVAL; | |
3035 | else | |
463c84b9 | 3036 | icsk->icsk_syn_retries = val; |
1da177e4 LT |
3037 | break; |
3038 | ||
cd8ae852 ED |
3039 | case TCP_SAVE_SYN: |
3040 | if (val < 0 || val > 1) | |
3041 | err = -EINVAL; | |
3042 | else | |
3043 | tp->save_syn = val; | |
3044 | break; | |
3045 | ||
1da177e4 LT |
3046 | case TCP_LINGER2: |
3047 | if (val < 0) | |
3048 | tp->linger2 = -1; | |
1e579caa | 3049 | else if (val > net->ipv4.sysctl_tcp_fin_timeout / HZ) |
1da177e4 LT |
3050 | tp->linger2 = 0; |
3051 | else | |
3052 | tp->linger2 = val * HZ; | |
3053 | break; | |
3054 | ||
3055 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
3056 | /* Translate value in seconds to number of retransmits */ |
3057 | icsk->icsk_accept_queue.rskq_defer_accept = | |
3058 | secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ, | |
3059 | TCP_RTO_MAX / HZ); | |
1da177e4 LT |
3060 | break; |
3061 | ||
3062 | case TCP_WINDOW_CLAMP: | |
3063 | if (!val) { | |
3064 | if (sk->sk_state != TCP_CLOSE) { | |
3065 | err = -EINVAL; | |
3066 | break; | |
3067 | } | |
3068 | tp->window_clamp = 0; | |
3069 | } else | |
3070 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? | |
3071 | SOCK_MIN_RCVBUF / 2 : val; | |
3072 | break; | |
3073 | ||
3074 | case TCP_QUICKACK: | |
3075 | if (!val) { | |
31954cd8 | 3076 | inet_csk_enter_pingpong_mode(sk); |
1da177e4 | 3077 | } else { |
31954cd8 | 3078 | inet_csk_exit_pingpong_mode(sk); |
1da177e4 LT |
3079 | if ((1 << sk->sk_state) & |
3080 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && | |
463c84b9 ACM |
3081 | inet_csk_ack_scheduled(sk)) { |
3082 | icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; | |
0e4b4992 | 3083 | tcp_cleanup_rbuf(sk, 1); |
1da177e4 | 3084 | if (!(val & 1)) |
31954cd8 | 3085 | inet_csk_enter_pingpong_mode(sk); |
1da177e4 LT |
3086 | } |
3087 | } | |
3088 | break; | |
3089 | ||
cfb6eeb4 YH |
3090 | #ifdef CONFIG_TCP_MD5SIG |
3091 | case TCP_MD5SIG: | |
8917a777 | 3092 | case TCP_MD5SIG_EXT: |
72123032 ED |
3093 | if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) |
3094 | err = tp->af_specific->md5_parse(sk, optname, optval, optlen); | |
3095 | else | |
3096 | err = -EINVAL; | |
cfb6eeb4 YH |
3097 | break; |
3098 | #endif | |
dca43c75 | 3099 | case TCP_USER_TIMEOUT: |
b248230c | 3100 | /* Cap the max time in ms TCP will retry or probe the window |
dca43c75 JC |
3101 | * before giving up and aborting (ETIMEDOUT) a connection. |
3102 | */ | |
42493570 HL |
3103 | if (val < 0) |
3104 | err = -EINVAL; | |
3105 | else | |
9bcc66e1 | 3106 | icsk->icsk_user_timeout = val; |
dca43c75 | 3107 | break; |
8336886f JC |
3108 | |
3109 | case TCP_FASTOPEN: | |
3110 | if (val >= 0 && ((1 << sk->sk_state) & (TCPF_CLOSE | | |
dfea2aa6 | 3111 | TCPF_LISTEN))) { |
43713848 | 3112 | tcp_fastopen_init_key_once(net); |
dfea2aa6 | 3113 | |
0536fcc0 | 3114 | fastopen_queue_tune(sk, val); |
dfea2aa6 | 3115 | } else { |
8336886f | 3116 | err = -EINVAL; |
dfea2aa6 | 3117 | } |
8336886f | 3118 | break; |
19f6d3f3 WW |
3119 | case TCP_FASTOPEN_CONNECT: |
3120 | if (val > 1 || val < 0) { | |
3121 | err = -EINVAL; | |
e1cfcbe8 | 3122 | } else if (net->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) { |
19f6d3f3 WW |
3123 | if (sk->sk_state == TCP_CLOSE) |
3124 | tp->fastopen_connect = val; | |
3125 | else | |
3126 | err = -EINVAL; | |
3127 | } else { | |
3128 | err = -EOPNOTSUPP; | |
3129 | } | |
3130 | break; | |
71c02379 CP |
3131 | case TCP_FASTOPEN_NO_COOKIE: |
3132 | if (val > 1 || val < 0) | |
3133 | err = -EINVAL; | |
3134 | else if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
3135 | err = -EINVAL; | |
3136 | else | |
3137 | tp->fastopen_no_cookie = val; | |
3138 | break; | |
93be6ce0 AV |
3139 | case TCP_TIMESTAMP: |
3140 | if (!tp->repair) | |
3141 | err = -EPERM; | |
3142 | else | |
9a568de4 | 3143 | tp->tsoffset = val - tcp_time_stamp_raw(); |
93be6ce0 | 3144 | break; |
b1ed4c4f AV |
3145 | case TCP_REPAIR_WINDOW: |
3146 | err = tcp_repair_set_window(tp, optval, optlen); | |
3147 | break; | |
c9bee3b7 ED |
3148 | case TCP_NOTSENT_LOWAT: |
3149 | tp->notsent_lowat = val; | |
3150 | sk->sk_write_space(sk); | |
3151 | break; | |
b75eba76 SHY |
3152 | case TCP_INQ: |
3153 | if (val > 1 || val < 0) | |
3154 | err = -EINVAL; | |
3155 | else | |
3156 | tp->recvmsg_inq = val; | |
3157 | break; | |
a842fe14 ED |
3158 | case TCP_TX_DELAY: |
3159 | if (val) | |
3160 | tcp_enable_tx_delay(); | |
3161 | tp->tcp_tx_delay = val; | |
3162 | break; | |
1da177e4 LT |
3163 | default: |
3164 | err = -ENOPROTOOPT; | |
3165 | break; | |
3ff50b79 SH |
3166 | } |
3167 | ||
1da177e4 LT |
3168 | release_sock(sk); |
3169 | return err; | |
3170 | } | |
3171 | ||
3fdadf7d | 3172 | int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
b7058842 | 3173 | unsigned int optlen) |
3fdadf7d | 3174 | { |
cf533ea5 | 3175 | const struct inet_connection_sock *icsk = inet_csk(sk); |
3fdadf7d DM |
3176 | |
3177 | if (level != SOL_TCP) | |
3178 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, | |
3179 | optval, optlen); | |
3180 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); | |
3181 | } | |
4bc2f18b | 3182 | EXPORT_SYMBOL(tcp_setsockopt); |
3fdadf7d DM |
3183 | |
3184 | #ifdef CONFIG_COMPAT | |
543d9cfe | 3185 | int compat_tcp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 3186 | char __user *optval, unsigned int optlen) |
3fdadf7d | 3187 | { |
dec73ff0 ACM |
3188 | if (level != SOL_TCP) |
3189 | return inet_csk_compat_setsockopt(sk, level, optname, | |
3190 | optval, optlen); | |
3fdadf7d DM |
3191 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
3192 | } | |
543d9cfe | 3193 | EXPORT_SYMBOL(compat_tcp_setsockopt); |
3fdadf7d DM |
3194 | #endif |
3195 | ||
efd90174 FY |
3196 | static void tcp_get_info_chrono_stats(const struct tcp_sock *tp, |
3197 | struct tcp_info *info) | |
3198 | { | |
3199 | u64 stats[__TCP_CHRONO_MAX], total = 0; | |
3200 | enum tcp_chrono i; | |
3201 | ||
3202 | for (i = TCP_CHRONO_BUSY; i < __TCP_CHRONO_MAX; ++i) { | |
3203 | stats[i] = tp->chrono_stat[i - 1]; | |
3204 | if (i == tp->chrono_type) | |
628174cc | 3205 | stats[i] += tcp_jiffies32 - tp->chrono_start; |
efd90174 FY |
3206 | stats[i] *= USEC_PER_SEC / HZ; |
3207 | total += stats[i]; | |
3208 | } | |
3209 | ||
3210 | info->tcpi_busy_time = total; | |
3211 | info->tcpi_rwnd_limited = stats[TCP_CHRONO_RWND_LIMITED]; | |
3212 | info->tcpi_sndbuf_limited = stats[TCP_CHRONO_SNDBUF_LIMITED]; | |
3213 | } | |
3214 | ||
1da177e4 | 3215 | /* Return information about state of tcp endpoint in API format. */ |
0df48c26 | 3216 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
1da177e4 | 3217 | { |
35ac838a | 3218 | const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */ |
463c84b9 | 3219 | const struct inet_connection_sock *icsk = inet_csk(sk); |
76a9ebe8 | 3220 | unsigned long rate; |
0263598c | 3221 | u32 now; |
ff5d7497 | 3222 | u64 rate64; |
67db3e4b | 3223 | bool slow; |
1da177e4 LT |
3224 | |
3225 | memset(info, 0, sizeof(*info)); | |
35ac838a CG |
3226 | if (sk->sk_type != SOCK_STREAM) |
3227 | return; | |
1da177e4 | 3228 | |
986ffdfd | 3229 | info->tcpi_state = inet_sk_state_load(sk); |
00fd38d9 | 3230 | |
ccbf3bfa ED |
3231 | /* Report meaningful fields for all TCP states, including listeners */ |
3232 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 3233 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3234 | info->tcpi_pacing_rate = rate64; |
ccbf3bfa ED |
3235 | |
3236 | rate = READ_ONCE(sk->sk_max_pacing_rate); | |
76a9ebe8 | 3237 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3238 | info->tcpi_max_pacing_rate = rate64; |
ccbf3bfa ED |
3239 | |
3240 | info->tcpi_reordering = tp->reordering; | |
3241 | info->tcpi_snd_cwnd = tp->snd_cwnd; | |
3242 | ||
3243 | if (info->tcpi_state == TCP_LISTEN) { | |
3244 | /* listeners aliased fields : | |
3245 | * tcpi_unacked -> Number of children ready for accept() | |
3246 | * tcpi_sacked -> max backlog | |
3247 | */ | |
288efe86 | 3248 | info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog); |
099ecf59 | 3249 | info->tcpi_sacked = READ_ONCE(sk->sk_max_ack_backlog); |
ccbf3bfa ED |
3250 | return; |
3251 | } | |
b369e7fd ED |
3252 | |
3253 | slow = lock_sock_fast(sk); | |
3254 | ||
6687e988 | 3255 | info->tcpi_ca_state = icsk->icsk_ca_state; |
463c84b9 | 3256 | info->tcpi_retransmits = icsk->icsk_retransmits; |
6687e988 | 3257 | info->tcpi_probes = icsk->icsk_probes_out; |
463c84b9 | 3258 | info->tcpi_backoff = icsk->icsk_backoff; |
1da177e4 LT |
3259 | |
3260 | if (tp->rx_opt.tstamp_ok) | |
3261 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
e60402d0 | 3262 | if (tcp_is_sack(tp)) |
1da177e4 LT |
3263 | info->tcpi_options |= TCPI_OPT_SACK; |
3264 | if (tp->rx_opt.wscale_ok) { | |
3265 | info->tcpi_options |= TCPI_OPT_WSCALE; | |
3266 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; | |
3267 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; | |
e905a9ed | 3268 | } |
1da177e4 | 3269 | |
b5c5693b | 3270 | if (tp->ecn_flags & TCP_ECN_OK) |
1da177e4 | 3271 | info->tcpi_options |= TCPI_OPT_ECN; |
b5c5693b ED |
3272 | if (tp->ecn_flags & TCP_ECN_SEEN) |
3273 | info->tcpi_options |= TCPI_OPT_ECN_SEEN; | |
6f73601e YC |
3274 | if (tp->syn_data_acked) |
3275 | info->tcpi_options |= TCPI_OPT_SYN_DATA; | |
1da177e4 | 3276 | |
463c84b9 ACM |
3277 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
3278 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); | |
c1b4a7e6 | 3279 | info->tcpi_snd_mss = tp->mss_cache; |
463c84b9 | 3280 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
1da177e4 | 3281 | |
ccbf3bfa ED |
3282 | info->tcpi_unacked = tp->packets_out; |
3283 | info->tcpi_sacked = tp->sacked_out; | |
3284 | ||
1da177e4 LT |
3285 | info->tcpi_lost = tp->lost_out; |
3286 | info->tcpi_retrans = tp->retrans_out; | |
1da177e4 | 3287 | |
d635fbe2 | 3288 | now = tcp_jiffies32; |
1da177e4 | 3289 | info->tcpi_last_data_sent = jiffies_to_msecs(now - tp->lsndtime); |
463c84b9 | 3290 | info->tcpi_last_data_recv = jiffies_to_msecs(now - icsk->icsk_ack.lrcvtime); |
1da177e4 LT |
3291 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
3292 | ||
d83d8461 | 3293 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
1da177e4 | 3294 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
740b0f18 ED |
3295 | info->tcpi_rtt = tp->srtt_us >> 3; |
3296 | info->tcpi_rttvar = tp->mdev_us >> 2; | |
1da177e4 | 3297 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
1da177e4 | 3298 | info->tcpi_advmss = tp->advmss; |
1da177e4 | 3299 | |
645f4c6f | 3300 | info->tcpi_rcv_rtt = tp->rcv_rtt_est.rtt_us >> 3; |
1da177e4 LT |
3301 | info->tcpi_rcv_space = tp->rcvq_space.space; |
3302 | ||
3303 | info->tcpi_total_retrans = tp->total_retrans; | |
977cb0ec | 3304 | |
f522a5fc ED |
3305 | info->tcpi_bytes_acked = tp->bytes_acked; |
3306 | info->tcpi_bytes_received = tp->bytes_received; | |
67db3e4b | 3307 | info->tcpi_notsent_bytes = max_t(int, 0, tp->write_seq - tp->snd_nxt); |
efd90174 | 3308 | tcp_get_info_chrono_stats(tp, info); |
67db3e4b | 3309 | |
2efd055c MRL |
3310 | info->tcpi_segs_out = tp->segs_out; |
3311 | info->tcpi_segs_in = tp->segs_in; | |
cd9b2660 | 3312 | |
cd9b2660 | 3313 | info->tcpi_min_rtt = tcp_min_rtt(tp); |
a44d6eac MKL |
3314 | info->tcpi_data_segs_in = tp->data_segs_in; |
3315 | info->tcpi_data_segs_out = tp->data_segs_out; | |
eb8329e0 YC |
3316 | |
3317 | info->tcpi_delivery_rate_app_limited = tp->rate_app_limited ? 1 : 0; | |
0263598c WW |
3318 | rate64 = tcp_compute_delivery_rate(tp); |
3319 | if (rate64) | |
f522a5fc | 3320 | info->tcpi_delivery_rate = rate64; |
feb5f2ec YC |
3321 | info->tcpi_delivered = tp->delivered; |
3322 | info->tcpi_delivered_ce = tp->delivered_ce; | |
ba113c3a | 3323 | info->tcpi_bytes_sent = tp->bytes_sent; |
fb31c9b9 | 3324 | info->tcpi_bytes_retrans = tp->bytes_retrans; |
7e10b655 | 3325 | info->tcpi_dsack_dups = tp->dsack_dups; |
7ec65372 | 3326 | info->tcpi_reord_seen = tp->reord_seen; |
f9af2dbb | 3327 | info->tcpi_rcv_ooopack = tp->rcv_ooopack; |
8f7baad7 | 3328 | info->tcpi_snd_wnd = tp->snd_wnd; |
48027478 | 3329 | info->tcpi_fastopen_client_fail = tp->fastopen_client_fail; |
b369e7fd | 3330 | unlock_sock_fast(sk, slow); |
1da177e4 | 3331 | } |
1da177e4 LT |
3332 | EXPORT_SYMBOL_GPL(tcp_get_info); |
3333 | ||
984988aa WW |
3334 | static size_t tcp_opt_stats_get_size(void) |
3335 | { | |
3336 | return | |
3337 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BUSY */ | |
3338 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_RWND_LIMITED */ | |
3339 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_SNDBUF_LIMITED */ | |
3340 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DATA_SEGS_OUT */ | |
3341 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_TOTAL_RETRANS */ | |
3342 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_PACING_RATE */ | |
3343 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DELIVERY_RATE */ | |
3344 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_CWND */ | |
3345 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORDERING */ | |
3346 | nla_total_size(sizeof(u32)) + /* TCP_NLA_MIN_RTT */ | |
3347 | nla_total_size(sizeof(u8)) + /* TCP_NLA_RECUR_RETRANS */ | |
3348 | nla_total_size(sizeof(u8)) + /* TCP_NLA_DELIVERY_RATE_APP_LMT */ | |
3349 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SNDQ_SIZE */ | |
3350 | nla_total_size(sizeof(u8)) + /* TCP_NLA_CA_STATE */ | |
3351 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_SSTHRESH */ | |
3352 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED */ | |
3353 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED_CE */ | |
ba113c3a | 3354 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_SENT */ |
fb31c9b9 | 3355 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_RETRANS */ |
7e10b655 | 3356 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DSACK_DUPS */ |
7ec65372 | 3357 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */ |
e8bd8fca | 3358 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */ |
32efcc06 | 3359 | nla_total_size(sizeof(u16)) + /* TCP_NLA_TIMEOUT_REHASH */ |
e08ab0b3 | 3360 | nla_total_size(sizeof(u32)) + /* TCP_NLA_BYTES_NOTSENT */ |
984988aa WW |
3361 | 0; |
3362 | } | |
3363 | ||
1c885808 FY |
3364 | struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk) |
3365 | { | |
3366 | const struct tcp_sock *tp = tcp_sk(sk); | |
3367 | struct sk_buff *stats; | |
3368 | struct tcp_info info; | |
76a9ebe8 | 3369 | unsigned long rate; |
bb7c19f9 | 3370 | u64 rate64; |
1c885808 | 3371 | |
984988aa | 3372 | stats = alloc_skb(tcp_opt_stats_get_size(), GFP_ATOMIC); |
1c885808 FY |
3373 | if (!stats) |
3374 | return NULL; | |
3375 | ||
3376 | tcp_get_info_chrono_stats(tp, &info); | |
3377 | nla_put_u64_64bit(stats, TCP_NLA_BUSY, | |
3378 | info.tcpi_busy_time, TCP_NLA_PAD); | |
3379 | nla_put_u64_64bit(stats, TCP_NLA_RWND_LIMITED, | |
3380 | info.tcpi_rwnd_limited, TCP_NLA_PAD); | |
3381 | nla_put_u64_64bit(stats, TCP_NLA_SNDBUF_LIMITED, | |
3382 | info.tcpi_sndbuf_limited, TCP_NLA_PAD); | |
7e98102f YC |
3383 | nla_put_u64_64bit(stats, TCP_NLA_DATA_SEGS_OUT, |
3384 | tp->data_segs_out, TCP_NLA_PAD); | |
3385 | nla_put_u64_64bit(stats, TCP_NLA_TOTAL_RETRANS, | |
3386 | tp->total_retrans, TCP_NLA_PAD); | |
bb7c19f9 WW |
3387 | |
3388 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 3389 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
bb7c19f9 WW |
3390 | nla_put_u64_64bit(stats, TCP_NLA_PACING_RATE, rate64, TCP_NLA_PAD); |
3391 | ||
3392 | rate64 = tcp_compute_delivery_rate(tp); | |
3393 | nla_put_u64_64bit(stats, TCP_NLA_DELIVERY_RATE, rate64, TCP_NLA_PAD); | |
3394 | ||
3395 | nla_put_u32(stats, TCP_NLA_SND_CWND, tp->snd_cwnd); | |
3396 | nla_put_u32(stats, TCP_NLA_REORDERING, tp->reordering); | |
3397 | nla_put_u32(stats, TCP_NLA_MIN_RTT, tcp_min_rtt(tp)); | |
3398 | ||
3399 | nla_put_u8(stats, TCP_NLA_RECUR_RETRANS, inet_csk(sk)->icsk_retransmits); | |
3400 | nla_put_u8(stats, TCP_NLA_DELIVERY_RATE_APP_LMT, !!tp->rate_app_limited); | |
7156d194 | 3401 | nla_put_u32(stats, TCP_NLA_SND_SSTHRESH, tp->snd_ssthresh); |
feb5f2ec YC |
3402 | nla_put_u32(stats, TCP_NLA_DELIVERED, tp->delivered); |
3403 | nla_put_u32(stats, TCP_NLA_DELIVERED_CE, tp->delivered_ce); | |
87ecc95d PJ |
3404 | |
3405 | nla_put_u32(stats, TCP_NLA_SNDQ_SIZE, tp->write_seq - tp->snd_una); | |
be631892 | 3406 | nla_put_u8(stats, TCP_NLA_CA_STATE, inet_csk(sk)->icsk_ca_state); |
feb5f2ec | 3407 | |
ba113c3a WW |
3408 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_SENT, tp->bytes_sent, |
3409 | TCP_NLA_PAD); | |
fb31c9b9 WW |
3410 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_RETRANS, tp->bytes_retrans, |
3411 | TCP_NLA_PAD); | |
7e10b655 | 3412 | nla_put_u32(stats, TCP_NLA_DSACK_DUPS, tp->dsack_dups); |
7ec65372 | 3413 | nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen); |
e8bd8fca | 3414 | nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3); |
32efcc06 | 3415 | nla_put_u16(stats, TCP_NLA_TIMEOUT_REHASH, tp->timeout_rehash); |
e08ab0b3 YS |
3416 | nla_put_u32(stats, TCP_NLA_BYTES_NOTSENT, |
3417 | max_t(int, 0, tp->write_seq - tp->snd_nxt)); | |
ba113c3a | 3418 | |
1c885808 FY |
3419 | return stats; |
3420 | } | |
3421 | ||
3fdadf7d DM |
3422 | static int do_tcp_getsockopt(struct sock *sk, int level, |
3423 | int optname, char __user *optval, int __user *optlen) | |
1da177e4 | 3424 | { |
295f7324 | 3425 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 3426 | struct tcp_sock *tp = tcp_sk(sk); |
6fa25166 | 3427 | struct net *net = sock_net(sk); |
1da177e4 LT |
3428 | int val, len; |
3429 | ||
1da177e4 LT |
3430 | if (get_user(len, optlen)) |
3431 | return -EFAULT; | |
3432 | ||
3433 | len = min_t(unsigned int, len, sizeof(int)); | |
3434 | ||
3435 | if (len < 0) | |
3436 | return -EINVAL; | |
3437 | ||
3438 | switch (optname) { | |
3439 | case TCP_MAXSEG: | |
c1b4a7e6 | 3440 | val = tp->mss_cache; |
1da177e4 LT |
3441 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
3442 | val = tp->rx_opt.user_mss; | |
5e6a3ce6 PE |
3443 | if (tp->repair) |
3444 | val = tp->rx_opt.mss_clamp; | |
1da177e4 LT |
3445 | break; |
3446 | case TCP_NODELAY: | |
3447 | val = !!(tp->nonagle&TCP_NAGLE_OFF); | |
3448 | break; | |
3449 | case TCP_CORK: | |
3450 | val = !!(tp->nonagle&TCP_NAGLE_CORK); | |
3451 | break; | |
3452 | case TCP_KEEPIDLE: | |
df19a626 | 3453 | val = keepalive_time_when(tp) / HZ; |
1da177e4 LT |
3454 | break; |
3455 | case TCP_KEEPINTVL: | |
df19a626 | 3456 | val = keepalive_intvl_when(tp) / HZ; |
1da177e4 LT |
3457 | break; |
3458 | case TCP_KEEPCNT: | |
df19a626 | 3459 | val = keepalive_probes(tp); |
1da177e4 LT |
3460 | break; |
3461 | case TCP_SYNCNT: | |
6fa25166 | 3462 | val = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries; |
1da177e4 LT |
3463 | break; |
3464 | case TCP_LINGER2: | |
3465 | val = tp->linger2; | |
3466 | if (val >= 0) | |
1e579caa | 3467 | val = (val ? : net->ipv4.sysctl_tcp_fin_timeout) / HZ; |
1da177e4 LT |
3468 | break; |
3469 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
3470 | val = retrans_to_secs(icsk->icsk_accept_queue.rskq_defer_accept, |
3471 | TCP_TIMEOUT_INIT / HZ, TCP_RTO_MAX / HZ); | |
1da177e4 LT |
3472 | break; |
3473 | case TCP_WINDOW_CLAMP: | |
3474 | val = tp->window_clamp; | |
3475 | break; | |
3476 | case TCP_INFO: { | |
3477 | struct tcp_info info; | |
3478 | ||
3479 | if (get_user(len, optlen)) | |
3480 | return -EFAULT; | |
3481 | ||
3482 | tcp_get_info(sk, &info); | |
3483 | ||
3484 | len = min_t(unsigned int, len, sizeof(info)); | |
3485 | if (put_user(len, optlen)) | |
3486 | return -EFAULT; | |
3487 | if (copy_to_user(optval, &info, len)) | |
3488 | return -EFAULT; | |
3489 | return 0; | |
3490 | } | |
6e9250f5 ED |
3491 | case TCP_CC_INFO: { |
3492 | const struct tcp_congestion_ops *ca_ops; | |
3493 | union tcp_cc_info info; | |
3494 | size_t sz = 0; | |
3495 | int attr; | |
3496 | ||
3497 | if (get_user(len, optlen)) | |
3498 | return -EFAULT; | |
3499 | ||
3500 | ca_ops = icsk->icsk_ca_ops; | |
3501 | if (ca_ops && ca_ops->get_info) | |
3502 | sz = ca_ops->get_info(sk, ~0U, &attr, &info); | |
3503 | ||
3504 | len = min_t(unsigned int, len, sz); | |
3505 | if (put_user(len, optlen)) | |
3506 | return -EFAULT; | |
3507 | if (copy_to_user(optval, &info, len)) | |
3508 | return -EFAULT; | |
3509 | return 0; | |
3510 | } | |
1da177e4 | 3511 | case TCP_QUICKACK: |
31954cd8 | 3512 | val = !inet_csk_in_pingpong_mode(sk); |
1da177e4 | 3513 | break; |
5f8ef48d SH |
3514 | |
3515 | case TCP_CONGESTION: | |
3516 | if (get_user(len, optlen)) | |
3517 | return -EFAULT; | |
3518 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); | |
3519 | if (put_user(len, optlen)) | |
3520 | return -EFAULT; | |
6687e988 | 3521 | if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) |
5f8ef48d SH |
3522 | return -EFAULT; |
3523 | return 0; | |
e56fb50f | 3524 | |
734942cc DW |
3525 | case TCP_ULP: |
3526 | if (get_user(len, optlen)) | |
3527 | return -EFAULT; | |
3528 | len = min_t(unsigned int, len, TCP_ULP_NAME_MAX); | |
d97af30f DW |
3529 | if (!icsk->icsk_ulp_ops) { |
3530 | if (put_user(0, optlen)) | |
3531 | return -EFAULT; | |
3532 | return 0; | |
3533 | } | |
734942cc DW |
3534 | if (put_user(len, optlen)) |
3535 | return -EFAULT; | |
3536 | if (copy_to_user(optval, icsk->icsk_ulp_ops->name, len)) | |
3537 | return -EFAULT; | |
3538 | return 0; | |
3539 | ||
1fba70e5 | 3540 | case TCP_FASTOPEN_KEY: { |
0f1ce023 | 3541 | __u8 key[TCP_FASTOPEN_KEY_BUF_LENGTH]; |
1fba70e5 | 3542 | struct tcp_fastopen_context *ctx; |
0f1ce023 | 3543 | unsigned int key_len = 0; |
1fba70e5 YC |
3544 | |
3545 | if (get_user(len, optlen)) | |
3546 | return -EFAULT; | |
3547 | ||
3548 | rcu_read_lock(); | |
3549 | ctx = rcu_dereference(icsk->icsk_accept_queue.fastopenq.ctx); | |
0f1ce023 JB |
3550 | if (ctx) { |
3551 | key_len = tcp_fastopen_context_len(ctx) * | |
3552 | TCP_FASTOPEN_KEY_LENGTH; | |
3553 | memcpy(&key[0], &ctx->key[0], key_len); | |
3554 | } | |
1fba70e5 YC |
3555 | rcu_read_unlock(); |
3556 | ||
0f1ce023 | 3557 | len = min_t(unsigned int, len, key_len); |
1fba70e5 YC |
3558 | if (put_user(len, optlen)) |
3559 | return -EFAULT; | |
3560 | if (copy_to_user(optval, key, len)) | |
3561 | return -EFAULT; | |
3562 | return 0; | |
3563 | } | |
3c0fef0b JH |
3564 | case TCP_THIN_LINEAR_TIMEOUTS: |
3565 | val = tp->thin_lto; | |
3566 | break; | |
4a7f6009 | 3567 | |
3c0fef0b | 3568 | case TCP_THIN_DUPACK: |
4a7f6009 | 3569 | val = 0; |
3c0fef0b | 3570 | break; |
dca43c75 | 3571 | |
ee995283 PE |
3572 | case TCP_REPAIR: |
3573 | val = tp->repair; | |
3574 | break; | |
3575 | ||
3576 | case TCP_REPAIR_QUEUE: | |
3577 | if (tp->repair) | |
3578 | val = tp->repair_queue; | |
3579 | else | |
3580 | return -EINVAL; | |
3581 | break; | |
3582 | ||
b1ed4c4f AV |
3583 | case TCP_REPAIR_WINDOW: { |
3584 | struct tcp_repair_window opt; | |
3585 | ||
3586 | if (get_user(len, optlen)) | |
3587 | return -EFAULT; | |
3588 | ||
3589 | if (len != sizeof(opt)) | |
3590 | return -EINVAL; | |
3591 | ||
3592 | if (!tp->repair) | |
3593 | return -EPERM; | |
3594 | ||
3595 | opt.snd_wl1 = tp->snd_wl1; | |
3596 | opt.snd_wnd = tp->snd_wnd; | |
3597 | opt.max_window = tp->max_window; | |
3598 | opt.rcv_wnd = tp->rcv_wnd; | |
3599 | opt.rcv_wup = tp->rcv_wup; | |
3600 | ||
3601 | if (copy_to_user(optval, &opt, len)) | |
3602 | return -EFAULT; | |
3603 | return 0; | |
3604 | } | |
ee995283 PE |
3605 | case TCP_QUEUE_SEQ: |
3606 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
3607 | val = tp->write_seq; | |
3608 | else if (tp->repair_queue == TCP_RECV_QUEUE) | |
3609 | val = tp->rcv_nxt; | |
3610 | else | |
3611 | return -EINVAL; | |
3612 | break; | |
3613 | ||
dca43c75 | 3614 | case TCP_USER_TIMEOUT: |
9bcc66e1 | 3615 | val = icsk->icsk_user_timeout; |
dca43c75 | 3616 | break; |
1536e285 KN |
3617 | |
3618 | case TCP_FASTOPEN: | |
0536fcc0 | 3619 | val = icsk->icsk_accept_queue.fastopenq.max_qlen; |
1536e285 KN |
3620 | break; |
3621 | ||
19f6d3f3 WW |
3622 | case TCP_FASTOPEN_CONNECT: |
3623 | val = tp->fastopen_connect; | |
3624 | break; | |
3625 | ||
71c02379 CP |
3626 | case TCP_FASTOPEN_NO_COOKIE: |
3627 | val = tp->fastopen_no_cookie; | |
3628 | break; | |
3629 | ||
a842fe14 ED |
3630 | case TCP_TX_DELAY: |
3631 | val = tp->tcp_tx_delay; | |
3632 | break; | |
3633 | ||
93be6ce0 | 3634 | case TCP_TIMESTAMP: |
9a568de4 | 3635 | val = tcp_time_stamp_raw() + tp->tsoffset; |
93be6ce0 | 3636 | break; |
c9bee3b7 ED |
3637 | case TCP_NOTSENT_LOWAT: |
3638 | val = tp->notsent_lowat; | |
3639 | break; | |
b75eba76 SHY |
3640 | case TCP_INQ: |
3641 | val = tp->recvmsg_inq; | |
3642 | break; | |
cd8ae852 ED |
3643 | case TCP_SAVE_SYN: |
3644 | val = tp->save_syn; | |
3645 | break; | |
3646 | case TCP_SAVED_SYN: { | |
3647 | if (get_user(len, optlen)) | |
3648 | return -EFAULT; | |
3649 | ||
3650 | lock_sock(sk); | |
3651 | if (tp->saved_syn) { | |
aea0929e EM |
3652 | if (len < tp->saved_syn[0]) { |
3653 | if (put_user(tp->saved_syn[0], optlen)) { | |
3654 | release_sock(sk); | |
3655 | return -EFAULT; | |
3656 | } | |
3657 | release_sock(sk); | |
3658 | return -EINVAL; | |
3659 | } | |
3660 | len = tp->saved_syn[0]; | |
cd8ae852 ED |
3661 | if (put_user(len, optlen)) { |
3662 | release_sock(sk); | |
3663 | return -EFAULT; | |
3664 | } | |
3665 | if (copy_to_user(optval, tp->saved_syn + 1, len)) { | |
3666 | release_sock(sk); | |
3667 | return -EFAULT; | |
3668 | } | |
3669 | tcp_saved_syn_free(tp); | |
3670 | release_sock(sk); | |
3671 | } else { | |
3672 | release_sock(sk); | |
3673 | len = 0; | |
3674 | if (put_user(len, optlen)) | |
3675 | return -EFAULT; | |
3676 | } | |
3677 | return 0; | |
3678 | } | |
05255b82 ED |
3679 | #ifdef CONFIG_MMU |
3680 | case TCP_ZEROCOPY_RECEIVE: { | |
3681 | struct tcp_zerocopy_receive zc; | |
3682 | int err; | |
3683 | ||
3684 | if (get_user(len, optlen)) | |
3685 | return -EFAULT; | |
c8856c05 | 3686 | if (len < offsetofend(struct tcp_zerocopy_receive, length)) |
05255b82 | 3687 | return -EINVAL; |
0b7f41f6 | 3688 | if (len > sizeof(zc)) { |
c8856c05 | 3689 | len = sizeof(zc); |
0b7f41f6 AR |
3690 | if (put_user(len, optlen)) |
3691 | return -EFAULT; | |
3692 | } | |
05255b82 ED |
3693 | if (copy_from_user(&zc, optval, len)) |
3694 | return -EFAULT; | |
3695 | lock_sock(sk); | |
3696 | err = tcp_zerocopy_receive(sk, &zc); | |
3697 | release_sock(sk); | |
33946518 AR |
3698 | if (len == sizeof(zc)) |
3699 | goto zerocopy_rcv_sk_err; | |
c8856c05 | 3700 | switch (len) { |
33946518 AR |
3701 | case offsetofend(struct tcp_zerocopy_receive, err): |
3702 | goto zerocopy_rcv_sk_err; | |
c8856c05 AR |
3703 | case offsetofend(struct tcp_zerocopy_receive, inq): |
3704 | goto zerocopy_rcv_inq; | |
3705 | case offsetofend(struct tcp_zerocopy_receive, length): | |
3706 | default: | |
3707 | goto zerocopy_rcv_out; | |
3708 | } | |
33946518 AR |
3709 | zerocopy_rcv_sk_err: |
3710 | if (!err) | |
3711 | zc.err = sock_error(sk); | |
c8856c05 AR |
3712 | zerocopy_rcv_inq: |
3713 | zc.inq = tcp_inq_hint(sk); | |
3714 | zerocopy_rcv_out: | |
05255b82 ED |
3715 | if (!err && copy_to_user(optval, &zc, len)) |
3716 | err = -EFAULT; | |
3717 | return err; | |
3718 | } | |
3719 | #endif | |
1da177e4 LT |
3720 | default: |
3721 | return -ENOPROTOOPT; | |
3ff50b79 | 3722 | } |
1da177e4 LT |
3723 | |
3724 | if (put_user(len, optlen)) | |
3725 | return -EFAULT; | |
3726 | if (copy_to_user(optval, &val, len)) | |
3727 | return -EFAULT; | |
3728 | return 0; | |
3729 | } | |
3730 | ||
3fdadf7d DM |
3731 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
3732 | int __user *optlen) | |
3733 | { | |
3734 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3735 | ||
3736 | if (level != SOL_TCP) | |
3737 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, | |
3738 | optval, optlen); | |
3739 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); | |
3740 | } | |
4bc2f18b | 3741 | EXPORT_SYMBOL(tcp_getsockopt); |
3fdadf7d DM |
3742 | |
3743 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
3744 | int compat_tcp_getsockopt(struct sock *sk, int level, int optname, |
3745 | char __user *optval, int __user *optlen) | |
3fdadf7d | 3746 | { |
dec73ff0 ACM |
3747 | if (level != SOL_TCP) |
3748 | return inet_csk_compat_getsockopt(sk, level, optname, | |
3749 | optval, optlen); | |
3fdadf7d DM |
3750 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
3751 | } | |
543d9cfe | 3752 | EXPORT_SYMBOL(compat_tcp_getsockopt); |
3fdadf7d | 3753 | #endif |
1da177e4 | 3754 | |
cfb6eeb4 | 3755 | #ifdef CONFIG_TCP_MD5SIG |
349ce993 | 3756 | static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool); |
71cea17e | 3757 | static DEFINE_MUTEX(tcp_md5sig_mutex); |
349ce993 | 3758 | static bool tcp_md5sig_pool_populated = false; |
cfb6eeb4 | 3759 | |
71cea17e | 3760 | static void __tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 3761 | { |
cf80e0e4 | 3762 | struct crypto_ahash *hash; |
cfb6eeb4 | 3763 | int cpu; |
cfb6eeb4 | 3764 | |
cf80e0e4 | 3765 | hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC); |
70477371 | 3766 | if (IS_ERR(hash)) |
cf80e0e4 HX |
3767 | return; |
3768 | ||
cfb6eeb4 | 3769 | for_each_possible_cpu(cpu) { |
19689e38 | 3770 | void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch; |
cf80e0e4 | 3771 | struct ahash_request *req; |
cfb6eeb4 | 3772 | |
19689e38 ED |
3773 | if (!scratch) { |
3774 | scratch = kmalloc_node(sizeof(union tcp_md5sum_block) + | |
3775 | sizeof(struct tcphdr), | |
3776 | GFP_KERNEL, | |
3777 | cpu_to_node(cpu)); | |
3778 | if (!scratch) | |
3779 | return; | |
3780 | per_cpu(tcp_md5sig_pool, cpu).scratch = scratch; | |
3781 | } | |
cf80e0e4 HX |
3782 | if (per_cpu(tcp_md5sig_pool, cpu).md5_req) |
3783 | continue; | |
3784 | ||
3785 | req = ahash_request_alloc(hash, GFP_KERNEL); | |
3786 | if (!req) | |
3787 | return; | |
3788 | ||
3789 | ahash_request_set_callback(req, 0, NULL, NULL); | |
3790 | ||
3791 | per_cpu(tcp_md5sig_pool, cpu).md5_req = req; | |
cfb6eeb4 | 3792 | } |
349ce993 ED |
3793 | /* before setting tcp_md5sig_pool_populated, we must commit all writes |
3794 | * to memory. See smp_rmb() in tcp_get_md5sig_pool() | |
71cea17e ED |
3795 | */ |
3796 | smp_wmb(); | |
349ce993 | 3797 | tcp_md5sig_pool_populated = true; |
cfb6eeb4 YH |
3798 | } |
3799 | ||
71cea17e | 3800 | bool tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 3801 | { |
349ce993 | 3802 | if (unlikely(!tcp_md5sig_pool_populated)) { |
71cea17e ED |
3803 | mutex_lock(&tcp_md5sig_mutex); |
3804 | ||
6015c71e | 3805 | if (!tcp_md5sig_pool_populated) { |
71cea17e | 3806 | __tcp_alloc_md5sig_pool(); |
6015c71e | 3807 | if (tcp_md5sig_pool_populated) |
921f9a0f | 3808 | static_branch_inc(&tcp_md5_needed); |
6015c71e | 3809 | } |
71cea17e ED |
3810 | |
3811 | mutex_unlock(&tcp_md5sig_mutex); | |
cfb6eeb4 | 3812 | } |
349ce993 | 3813 | return tcp_md5sig_pool_populated; |
cfb6eeb4 | 3814 | } |
cfb6eeb4 YH |
3815 | EXPORT_SYMBOL(tcp_alloc_md5sig_pool); |
3816 | ||
35790c04 ED |
3817 | |
3818 | /** | |
3819 | * tcp_get_md5sig_pool - get md5sig_pool for this user | |
3820 | * | |
3821 | * We use percpu structure, so if we succeed, we exit with preemption | |
3822 | * and BH disabled, to make sure another thread or softirq handling | |
3823 | * wont try to get same context. | |
3824 | */ | |
3825 | struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) | |
cfb6eeb4 | 3826 | { |
35790c04 | 3827 | local_bh_disable(); |
cfb6eeb4 | 3828 | |
349ce993 ED |
3829 | if (tcp_md5sig_pool_populated) { |
3830 | /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */ | |
3831 | smp_rmb(); | |
3832 | return this_cpu_ptr(&tcp_md5sig_pool); | |
3833 | } | |
35790c04 ED |
3834 | local_bh_enable(); |
3835 | return NULL; | |
3836 | } | |
3837 | EXPORT_SYMBOL(tcp_get_md5sig_pool); | |
cfb6eeb4 | 3838 | |
49a72dfb | 3839 | int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, |
cf533ea5 | 3840 | const struct sk_buff *skb, unsigned int header_len) |
49a72dfb AL |
3841 | { |
3842 | struct scatterlist sg; | |
3843 | const struct tcphdr *tp = tcp_hdr(skb); | |
cf80e0e4 | 3844 | struct ahash_request *req = hp->md5_req; |
95c96174 ED |
3845 | unsigned int i; |
3846 | const unsigned int head_data_len = skb_headlen(skb) > header_len ? | |
3847 | skb_headlen(skb) - header_len : 0; | |
49a72dfb | 3848 | const struct skb_shared_info *shi = skb_shinfo(skb); |
d7fd1b57 | 3849 | struct sk_buff *frag_iter; |
49a72dfb AL |
3850 | |
3851 | sg_init_table(&sg, 1); | |
3852 | ||
3853 | sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); | |
cf80e0e4 HX |
3854 | ahash_request_set_crypt(req, &sg, NULL, head_data_len); |
3855 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
3856 | return 1; |
3857 | ||
3858 | for (i = 0; i < shi->nr_frags; ++i) { | |
d8e18a51 | 3859 | const skb_frag_t *f = &shi->frags[i]; |
b54c9d5b | 3860 | unsigned int offset = skb_frag_off(f); |
54d27fcb ED |
3861 | struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); |
3862 | ||
3863 | sg_set_page(&sg, page, skb_frag_size(f), | |
3864 | offset_in_page(offset)); | |
cf80e0e4 HX |
3865 | ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f)); |
3866 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
3867 | return 1; |
3868 | } | |
3869 | ||
d7fd1b57 ED |
3870 | skb_walk_frags(skb, frag_iter) |
3871 | if (tcp_md5_hash_skb_data(hp, frag_iter, 0)) | |
3872 | return 1; | |
3873 | ||
49a72dfb AL |
3874 | return 0; |
3875 | } | |
49a72dfb AL |
3876 | EXPORT_SYMBOL(tcp_md5_hash_skb_data); |
3877 | ||
cf533ea5 | 3878 | int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key) |
49a72dfb AL |
3879 | { |
3880 | struct scatterlist sg; | |
3881 | ||
3882 | sg_init_one(&sg, key->key, key->keylen); | |
cf80e0e4 HX |
3883 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, key->keylen); |
3884 | return crypto_ahash_update(hp->md5_req); | |
49a72dfb | 3885 | } |
49a72dfb AL |
3886 | EXPORT_SYMBOL(tcp_md5_hash_key); |
3887 | ||
cfb6eeb4 YH |
3888 | #endif |
3889 | ||
4ac02bab AK |
3890 | void tcp_done(struct sock *sk) |
3891 | { | |
d983ea6f | 3892 | struct request_sock *req; |
8336886f | 3893 | |
cab209e5 ED |
3894 | /* We might be called with a new socket, after |
3895 | * inet_csk_prepare_forced_close() has been called | |
3896 | * so we can not use lockdep_sock_is_held(sk) | |
3897 | */ | |
3898 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, 1); | |
8336886f | 3899 | |
5a5f3a8d | 3900 | if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV) |
c10d9310 | 3901 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS); |
4ac02bab AK |
3902 | |
3903 | tcp_set_state(sk, TCP_CLOSE); | |
3904 | tcp_clear_xmit_timers(sk); | |
00db4124 | 3905 | if (req) |
8336886f | 3906 | reqsk_fastopen_remove(sk, req, false); |
4ac02bab AK |
3907 | |
3908 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3909 | ||
3910 | if (!sock_flag(sk, SOCK_DEAD)) | |
3911 | sk->sk_state_change(sk); | |
3912 | else | |
3913 | inet_csk_destroy_sock(sk); | |
3914 | } | |
3915 | EXPORT_SYMBOL_GPL(tcp_done); | |
3916 | ||
c1e64e29 LC |
3917 | int tcp_abort(struct sock *sk, int err) |
3918 | { | |
3919 | if (!sk_fullsock(sk)) { | |
07f6f4a3 ED |
3920 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
3921 | struct request_sock *req = inet_reqsk(sk); | |
3922 | ||
3923 | local_bh_disable(); | |
acc2cf4e | 3924 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
07f6f4a3 ED |
3925 | local_bh_enable(); |
3926 | return 0; | |
3927 | } | |
c1e64e29 LC |
3928 | return -EOPNOTSUPP; |
3929 | } | |
3930 | ||
3931 | /* Don't race with userspace socket closes such as tcp_close. */ | |
3932 | lock_sock(sk); | |
3933 | ||
2010b93e LC |
3934 | if (sk->sk_state == TCP_LISTEN) { |
3935 | tcp_set_state(sk, TCP_CLOSE); | |
3936 | inet_csk_listen_stop(sk); | |
3937 | } | |
3938 | ||
c1e64e29 LC |
3939 | /* Don't race with BH socket closes such as inet_csk_listen_stop. */ |
3940 | local_bh_disable(); | |
3941 | bh_lock_sock(sk); | |
3942 | ||
3943 | if (!sock_flag(sk, SOCK_DEAD)) { | |
3944 | sk->sk_err = err; | |
3945 | /* This barrier is coupled with smp_rmb() in tcp_poll() */ | |
3946 | smp_wmb(); | |
3947 | sk->sk_error_report(sk); | |
3948 | if (tcp_need_reset(sk->sk_state)) | |
3949 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
3950 | tcp_done(sk); | |
3951 | } | |
3952 | ||
3953 | bh_unlock_sock(sk); | |
3954 | local_bh_enable(); | |
e05836ac | 3955 | tcp_write_queue_purge(sk); |
c1e64e29 | 3956 | release_sock(sk); |
c1e64e29 LC |
3957 | return 0; |
3958 | } | |
3959 | EXPORT_SYMBOL_GPL(tcp_abort); | |
3960 | ||
5f8ef48d | 3961 | extern struct tcp_congestion_ops tcp_reno; |
1da177e4 LT |
3962 | |
3963 | static __initdata unsigned long thash_entries; | |
3964 | static int __init set_thash_entries(char *str) | |
3965 | { | |
413c27d8 EZ |
3966 | ssize_t ret; |
3967 | ||
1da177e4 LT |
3968 | if (!str) |
3969 | return 0; | |
413c27d8 EZ |
3970 | |
3971 | ret = kstrtoul(str, 0, &thash_entries); | |
3972 | if (ret) | |
3973 | return 0; | |
3974 | ||
1da177e4 LT |
3975 | return 1; |
3976 | } | |
3977 | __setup("thash_entries=", set_thash_entries); | |
3978 | ||
47d7a88c | 3979 | static void __init tcp_init_mem(void) |
4acb4190 | 3980 | { |
b66e91cc ED |
3981 | unsigned long limit = nr_free_buffer_pages() / 16; |
3982 | ||
4acb4190 | 3983 | limit = max(limit, 128UL); |
b66e91cc ED |
3984 | sysctl_tcp_mem[0] = limit / 4 * 3; /* 4.68 % */ |
3985 | sysctl_tcp_mem[1] = limit; /* 6.25 % */ | |
3986 | sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; /* 9.37 % */ | |
4acb4190 GC |
3987 | } |
3988 | ||
1da177e4 LT |
3989 | void __init tcp_init(void) |
3990 | { | |
b49960a0 | 3991 | int max_rshare, max_wshare, cnt; |
b2d3ea4a | 3992 | unsigned long limit; |
074b8517 | 3993 | unsigned int i; |
1da177e4 | 3994 | |
3b4929f6 | 3995 | BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE); |
b2d3ea4a | 3996 | BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > |
c593642c | 3997 | sizeof_field(struct sk_buff, cb)); |
1da177e4 | 3998 | |
908c7f19 TH |
3999 | percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL); |
4000 | percpu_counter_init(&tcp_orphan_count, 0, GFP_KERNEL); | |
1946e672 | 4001 | inet_hashinfo_init(&tcp_hashinfo); |
27da6d37 MKL |
4002 | inet_hashinfo2_init(&tcp_hashinfo, "tcp_listen_portaddr_hash", |
4003 | thash_entries, 21, /* one slot per 2 MB*/ | |
4004 | 0, 64 * 1024); | |
6e04e021 ACM |
4005 | tcp_hashinfo.bind_bucket_cachep = |
4006 | kmem_cache_create("tcp_bind_bucket", | |
4007 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 4008 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 4009 | |
1da177e4 LT |
4010 | /* Size and allocate the main established and bind bucket |
4011 | * hash tables. | |
4012 | * | |
4013 | * The methodology is similar to that of the buffer cache. | |
4014 | */ | |
6e04e021 | 4015 | tcp_hashinfo.ehash = |
1da177e4 | 4016 | alloc_large_system_hash("TCP established", |
0f7ff927 | 4017 | sizeof(struct inet_ehash_bucket), |
1da177e4 | 4018 | thash_entries, |
fd90b29d | 4019 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 4020 | 0, |
1da177e4 | 4021 | NULL, |
f373b53b | 4022 | &tcp_hashinfo.ehash_mask, |
31fe62b9 | 4023 | 0, |
0ccfe618 | 4024 | thash_entries ? 0 : 512 * 1024); |
05dbc7b5 | 4025 | for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) |
3ab5aee7 | 4026 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i); |
05dbc7b5 | 4027 | |
230140cf ED |
4028 | if (inet_ehash_locks_alloc(&tcp_hashinfo)) |
4029 | panic("TCP: failed to alloc ehash_locks"); | |
6e04e021 | 4030 | tcp_hashinfo.bhash = |
1da177e4 | 4031 | alloc_large_system_hash("TCP bind", |
0f7ff927 | 4032 | sizeof(struct inet_bind_hashbucket), |
f373b53b | 4033 | tcp_hashinfo.ehash_mask + 1, |
fd90b29d | 4034 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 4035 | 0, |
6e04e021 | 4036 | &tcp_hashinfo.bhash_size, |
1da177e4 | 4037 | NULL, |
31fe62b9 | 4038 | 0, |
1da177e4 | 4039 | 64 * 1024); |
074b8517 | 4040 | tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size; |
6e04e021 ACM |
4041 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
4042 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); | |
4043 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); | |
1da177e4 LT |
4044 | } |
4045 | ||
c5ed63d6 ED |
4046 | |
4047 | cnt = tcp_hashinfo.ehash_mask + 1; | |
c5ed63d6 | 4048 | sysctl_tcp_max_orphans = cnt / 2; |
1da177e4 | 4049 | |
a4fe34bf | 4050 | tcp_init_mem(); |
c43b874d | 4051 | /* Set per-socket limits to no more than 1/128 the pressure threshold */ |
5fb84b14 | 4052 | limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); |
b49960a0 ED |
4053 | max_wshare = min(4UL*1024*1024, limit); |
4054 | max_rshare = min(6UL*1024*1024, limit); | |
7b4f4b5e | 4055 | |
356d1833 ED |
4056 | init_net.ipv4.sysctl_tcp_wmem[0] = SK_MEM_QUANTUM; |
4057 | init_net.ipv4.sysctl_tcp_wmem[1] = 16*1024; | |
4058 | init_net.ipv4.sysctl_tcp_wmem[2] = max(64*1024, max_wshare); | |
7b4f4b5e | 4059 | |
356d1833 | 4060 | init_net.ipv4.sysctl_tcp_rmem[0] = SK_MEM_QUANTUM; |
a337531b YC |
4061 | init_net.ipv4.sysctl_tcp_rmem[1] = 131072; |
4062 | init_net.ipv4.sysctl_tcp_rmem[2] = max(131072, max_rshare); | |
1da177e4 | 4063 | |
afd46503 | 4064 | pr_info("Hash tables configured (established %u bind %u)\n", |
058bd4d2 | 4065 | tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size); |
317a76f9 | 4066 | |
1946e672 | 4067 | tcp_v4_init(); |
51c5d0c4 | 4068 | tcp_metrics_init(); |
55d8694f | 4069 | BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0); |
46d3ceab | 4070 | tcp_tasklet_init(); |
f870fa0b | 4071 | mptcp_init(); |
1da177e4 | 4072 | } |