Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * 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 LT |
273 | #include <net/tcp.h> |
274 | #include <net/xfrm.h> | |
275 | #include <net/ip.h> | |
9c55e01c | 276 | #include <net/sock.h> |
1da177e4 | 277 | |
7c0f6ba6 | 278 | #include <linux/uaccess.h> |
1da177e4 | 279 | #include <asm/ioctls.h> |
076bb0c8 | 280 | #include <net/busy_poll.h> |
1da177e4 | 281 | |
dd24c001 | 282 | struct percpu_counter tcp_orphan_count; |
0a5578cf ACM |
283 | EXPORT_SYMBOL_GPL(tcp_orphan_count); |
284 | ||
a4fe34bf | 285 | long sysctl_tcp_mem[3] __read_mostly; |
a4fe34bf | 286 | EXPORT_SYMBOL(sysctl_tcp_mem); |
1da177e4 | 287 | |
8d987e5c | 288 | atomic_long_t tcp_memory_allocated; /* Current allocated memory. */ |
1da177e4 | 289 | EXPORT_SYMBOL(tcp_memory_allocated); |
1748376b | 290 | |
60e2a778 UB |
291 | #if IS_ENABLED(CONFIG_SMC) |
292 | DEFINE_STATIC_KEY_FALSE(tcp_have_smc); | |
293 | EXPORT_SYMBOL(tcp_have_smc); | |
294 | #endif | |
295 | ||
1748376b ED |
296 | /* |
297 | * Current number of TCP sockets. | |
298 | */ | |
299 | struct percpu_counter tcp_sockets_allocated; | |
1da177e4 LT |
300 | EXPORT_SYMBOL(tcp_sockets_allocated); |
301 | ||
9c55e01c JA |
302 | /* |
303 | * TCP splice context | |
304 | */ | |
305 | struct tcp_splice_state { | |
306 | struct pipe_inode_info *pipe; | |
307 | size_t len; | |
308 | unsigned int flags; | |
309 | }; | |
310 | ||
1da177e4 LT |
311 | /* |
312 | * Pressure flag: try to collapse. | |
313 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 314 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
315 | * is strict, actions are advisory and have some latency. |
316 | */ | |
06044751 ED |
317 | unsigned long tcp_memory_pressure __read_mostly; |
318 | EXPORT_SYMBOL_GPL(tcp_memory_pressure); | |
1da177e4 | 319 | |
2e05fcae ED |
320 | DEFINE_STATIC_KEY_FALSE(tcp_rx_skb_cache_key); |
321 | EXPORT_SYMBOL(tcp_rx_skb_cache_key); | |
322 | ||
323 | DEFINE_STATIC_KEY_FALSE(tcp_tx_skb_cache_key); | |
324 | ||
5c52ba17 | 325 | void tcp_enter_memory_pressure(struct sock *sk) |
1da177e4 | 326 | { |
06044751 ED |
327 | unsigned long val; |
328 | ||
1f142c17 | 329 | if (READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
330 | return; |
331 | val = jiffies; | |
332 | ||
333 | if (!val) | |
334 | val--; | |
335 | if (!cmpxchg(&tcp_memory_pressure, 0, val)) | |
4e673444 | 336 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES); |
1da177e4 | 337 | } |
06044751 ED |
338 | EXPORT_SYMBOL_GPL(tcp_enter_memory_pressure); |
339 | ||
340 | void tcp_leave_memory_pressure(struct sock *sk) | |
341 | { | |
342 | unsigned long val; | |
343 | ||
1f142c17 | 344 | if (!READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
345 | return; |
346 | val = xchg(&tcp_memory_pressure, 0); | |
347 | if (val) | |
348 | NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURESCHRONO, | |
349 | jiffies_to_msecs(jiffies - val)); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(tcp_leave_memory_pressure); | |
1da177e4 | 352 | |
b103cf34 JA |
353 | /* Convert seconds to retransmits based on initial and max timeout */ |
354 | static u8 secs_to_retrans(int seconds, int timeout, int rto_max) | |
355 | { | |
356 | u8 res = 0; | |
357 | ||
358 | if (seconds > 0) { | |
359 | int period = timeout; | |
360 | ||
361 | res = 1; | |
362 | while (seconds > period && res < 255) { | |
363 | res++; | |
364 | timeout <<= 1; | |
365 | if (timeout > rto_max) | |
366 | timeout = rto_max; | |
367 | period += timeout; | |
368 | } | |
369 | } | |
370 | return res; | |
371 | } | |
372 | ||
373 | /* Convert retransmits to seconds based on initial and max timeout */ | |
374 | static int retrans_to_secs(u8 retrans, int timeout, int rto_max) | |
375 | { | |
376 | int period = 0; | |
377 | ||
378 | if (retrans > 0) { | |
379 | period = timeout; | |
380 | while (--retrans) { | |
381 | timeout <<= 1; | |
382 | if (timeout > rto_max) | |
383 | timeout = rto_max; | |
384 | period += timeout; | |
385 | } | |
386 | } | |
387 | return period; | |
388 | } | |
389 | ||
0263598c WW |
390 | static u64 tcp_compute_delivery_rate(const struct tcp_sock *tp) |
391 | { | |
392 | u32 rate = READ_ONCE(tp->rate_delivered); | |
393 | u32 intv = READ_ONCE(tp->rate_interval_us); | |
394 | u64 rate64 = 0; | |
395 | ||
396 | if (rate && intv) { | |
397 | rate64 = (u64)rate * tp->mss_cache * USEC_PER_SEC; | |
398 | do_div(rate64, intv); | |
399 | } | |
400 | return rate64; | |
401 | } | |
402 | ||
900f65d3 NC |
403 | /* Address-family independent initialization for a tcp_sock. |
404 | * | |
405 | * NOTE: A lot of things set to zero explicitly by call to | |
406 | * sk_alloc() so need not be done here. | |
407 | */ | |
408 | void tcp_init_sock(struct sock *sk) | |
409 | { | |
410 | struct inet_connection_sock *icsk = inet_csk(sk); | |
411 | struct tcp_sock *tp = tcp_sk(sk); | |
412 | ||
9f5afeae | 413 | tp->out_of_order_queue = RB_ROOT; |
75c119af | 414 | sk->tcp_rtx_queue = RB_ROOT; |
900f65d3 | 415 | tcp_init_xmit_timers(sk); |
46d3ceab | 416 | INIT_LIST_HEAD(&tp->tsq_node); |
e2080072 | 417 | INIT_LIST_HEAD(&tp->tsorted_sent_queue); |
900f65d3 NC |
418 | |
419 | icsk->icsk_rto = TCP_TIMEOUT_INIT; | |
740b0f18 | 420 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
ac9517fc | 421 | minmax_reset(&tp->rtt_min, tcp_jiffies32, ~0U); |
900f65d3 NC |
422 | |
423 | /* So many TCP implementations out there (incorrectly) count the | |
424 | * initial SYN frame in their delayed-ACK and congestion control | |
425 | * algorithms that we must have the following bandaid to talk | |
426 | * efficiently to them. -DaveM | |
427 | */ | |
428 | tp->snd_cwnd = TCP_INIT_CWND; | |
429 | ||
d7722e85 SHY |
430 | /* There's a bubble in the pipe until at least the first ACK. */ |
431 | tp->app_limited = ~0U; | |
432 | ||
900f65d3 NC |
433 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
434 | * initialization of these values. | |
435 | */ | |
436 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
437 | tp->snd_cwnd_clamp = ~0; | |
438 | tp->mss_cache = TCP_MSS_DEFAULT; | |
439 | ||
1043e25f | 440 | tp->reordering = sock_net(sk)->ipv4.sysctl_tcp_reordering; |
55d8694f | 441 | tcp_assign_congestion_control(sk); |
900f65d3 | 442 | |
ceaa1fef | 443 | tp->tsoffset = 0; |
1f255691 | 444 | tp->rack.reo_wnd_steps = 1; |
ceaa1fef | 445 | |
900f65d3 NC |
446 | sk->sk_state = TCP_CLOSE; |
447 | ||
448 | sk->sk_write_space = sk_stream_write_space; | |
449 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
450 | ||
451 | icsk->icsk_sync_mss = tcp_sync_mss; | |
452 | ||
356d1833 ED |
453 | sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1]; |
454 | sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1]; | |
900f65d3 | 455 | |
900f65d3 | 456 | sk_sockets_allocated_inc(sk); |
0a6b2a1d | 457 | sk->sk_route_forced_caps = NETIF_F_GSO; |
900f65d3 NC |
458 | } |
459 | EXPORT_SYMBOL(tcp_init_sock); | |
460 | ||
4e8cc228 | 461 | static void tcp_tx_timestamp(struct sock *sk, u16 tsflags) |
4ed2d765 | 462 | { |
4e8cc228 ED |
463 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
464 | ||
ad02c4f5 | 465 | if (tsflags && skb) { |
f066e2b0 | 466 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
6b084928 | 467 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
4ed2d765 | 468 | |
c14ac945 | 469 | sock_tx_timestamp(sk, tsflags, &shinfo->tx_flags); |
0a2cf20c SHY |
470 | if (tsflags & SOF_TIMESTAMPING_TX_ACK) |
471 | tcb->txstamp_ack = 1; | |
472 | if (tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) | |
f066e2b0 WB |
473 | shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1; |
474 | } | |
4ed2d765 WB |
475 | } |
476 | ||
8934ce2f JF |
477 | static inline bool tcp_stream_is_readable(const struct tcp_sock *tp, |
478 | int target, struct sock *sk) | |
479 | { | |
480 | return (tp->rcv_nxt - tp->copied_seq >= target) || | |
481 | (sk->sk_prot->stream_memory_read ? | |
482 | sk->sk_prot->stream_memory_read(sk) : false); | |
483 | } | |
484 | ||
1da177e4 | 485 | /* |
a11e1d43 LT |
486 | * Wait for a TCP event. |
487 | * | |
488 | * Note that we don't need to lock the socket, as the upper poll layers | |
489 | * take care of normal races (between the test and the event) and we don't | |
490 | * go look at any of the socket buffers directly. | |
1da177e4 | 491 | */ |
a11e1d43 | 492 | __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 | 493 | { |
a11e1d43 | 494 | __poll_t mask; |
1da177e4 | 495 | struct sock *sk = sock->sk; |
cf533ea5 | 496 | const struct tcp_sock *tp = tcp_sk(sk); |
00fd38d9 | 497 | int state; |
1da177e4 | 498 | |
89ab066d | 499 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 500 | |
986ffdfd | 501 | state = inet_sk_state_load(sk); |
00fd38d9 | 502 | if (state == TCP_LISTEN) |
dc40c7bc | 503 | return inet_csk_listen_poll(sk); |
1da177e4 | 504 | |
a11e1d43 LT |
505 | /* Socket is not locked. We are protected from async events |
506 | * by poll logic and correct handling of state changes | |
507 | * made by other threads is impossible in any case. | |
508 | */ | |
509 | ||
510 | mask = 0; | |
511 | ||
1da177e4 | 512 | /* |
a9a08845 | 513 | * EPOLLHUP is certainly not done right. But poll() doesn't |
1da177e4 LT |
514 | * have a notion of HUP in just one direction, and for a |
515 | * socket the read side is more interesting. | |
516 | * | |
a9a08845 LT |
517 | * Some poll() documentation says that EPOLLHUP is incompatible |
518 | * with the EPOLLOUT/POLLWR flags, so somebody should check this | |
1da177e4 LT |
519 | * all. But careful, it tends to be safer to return too many |
520 | * bits than too few, and you can easily break real applications | |
521 | * if you don't tell them that something has hung up! | |
522 | * | |
523 | * Check-me. | |
524 | * | |
a9a08845 | 525 | * Check number 1. EPOLLHUP is _UNMASKABLE_ event (see UNIX98 and |
1da177e4 LT |
526 | * our fs/select.c). It means that after we received EOF, |
527 | * poll always returns immediately, making impossible poll() on write() | |
a9a08845 | 528 | * in state CLOSE_WAIT. One solution is evident --- to set EPOLLHUP |
1da177e4 LT |
529 | * if and only if shutdown has been made in both directions. |
530 | * Actually, it is interesting to look how Solaris and DUX | |
a9a08845 | 531 | * solve this dilemma. I would prefer, if EPOLLHUP were maskable, |
1da177e4 LT |
532 | * then we could set it on SND_SHUTDOWN. BTW examples given |
533 | * in Stevens' books assume exactly this behaviour, it explains | |
a9a08845 | 534 | * why EPOLLHUP is incompatible with EPOLLOUT. --ANK |
1da177e4 LT |
535 | * |
536 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent | |
537 | * blocking on fresh not-connected or disconnected socket. --ANK | |
538 | */ | |
00fd38d9 | 539 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
a9a08845 | 540 | mask |= EPOLLHUP; |
1da177e4 | 541 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 542 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
1da177e4 | 543 | |
8336886f | 544 | /* Connected or passive Fast Open socket? */ |
00fd38d9 | 545 | if (state != TCP_SYN_SENT && |
d983ea6f | 546 | (state != TCP_SYN_RECV || rcu_access_pointer(tp->fastopen_rsk))) { |
c7004482 DM |
547 | int target = sock_rcvlowat(sk, 0, INT_MAX); |
548 | ||
549 | if (tp->urg_seq == tp->copied_seq && | |
550 | !sock_flag(sk, SOCK_URGINLINE) && | |
551 | tp->urg_data) | |
b634f875 | 552 | target++; |
c7004482 | 553 | |
8934ce2f | 554 | if (tcp_stream_is_readable(tp, target, sk)) |
a9a08845 | 555 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
556 | |
557 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
64dc6130 | 558 | if (sk_stream_is_writeable(sk)) { |
a9a08845 | 559 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 560 | } else { /* send SIGIO later */ |
9cd3e072 | 561 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
562 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
563 | ||
564 | /* Race breaker. If space is freed after | |
565 | * wspace test but before the flags are set, | |
3c715127 | 566 | * IO signal will be lost. Memory barrier |
567 | * pairs with the input side. | |
1da177e4 | 568 | */ |
3c715127 | 569 | smp_mb__after_atomic(); |
64dc6130 | 570 | if (sk_stream_is_writeable(sk)) |
a9a08845 | 571 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 572 | } |
d84ba638 | 573 | } else |
a9a08845 | 574 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 LT |
575 | |
576 | if (tp->urg_data & TCP_URG_VALID) | |
a9a08845 | 577 | mask |= EPOLLPRI; |
d68be71e | 578 | } else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) { |
19f6d3f3 | 579 | /* Active TCP fastopen socket with defer_connect |
a9a08845 | 580 | * Return EPOLLOUT so application can call write() |
19f6d3f3 WW |
581 | * in order for kernel to generate SYN+data |
582 | */ | |
a9a08845 | 583 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 584 | } |
a4d25803 TM |
585 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
586 | smp_rmb(); | |
4ed2d765 | 587 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
a9a08845 | 588 | mask |= EPOLLERR; |
a4d25803 | 589 | |
1da177e4 LT |
590 | return mask; |
591 | } | |
a11e1d43 | 592 | EXPORT_SYMBOL(tcp_poll); |
1da177e4 LT |
593 | |
594 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
595 | { | |
596 | struct tcp_sock *tp = tcp_sk(sk); | |
597 | int answ; | |
0e71c55c | 598 | bool slow; |
1da177e4 LT |
599 | |
600 | switch (cmd) { | |
601 | case SIOCINQ: | |
602 | if (sk->sk_state == TCP_LISTEN) | |
603 | return -EINVAL; | |
604 | ||
0e71c55c | 605 | slow = lock_sock_fast(sk); |
473bd239 | 606 | answ = tcp_inq(sk); |
0e71c55c | 607 | unlock_sock_fast(sk, slow); |
1da177e4 LT |
608 | break; |
609 | case SIOCATMARK: | |
610 | answ = tp->urg_data && tp->urg_seq == tp->copied_seq; | |
611 | break; | |
612 | case SIOCOUTQ: | |
613 | if (sk->sk_state == TCP_LISTEN) | |
614 | return -EINVAL; | |
615 | ||
616 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
617 | answ = 0; | |
618 | else | |
619 | answ = tp->write_seq - tp->snd_una; | |
620 | break; | |
2f4e1b39 MS |
621 | case SIOCOUTQNSD: |
622 | if (sk->sk_state == TCP_LISTEN) | |
623 | return -EINVAL; | |
624 | ||
625 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
626 | answ = 0; | |
627 | else | |
628 | answ = tp->write_seq - tp->snd_nxt; | |
629 | break; | |
1da177e4 LT |
630 | default: |
631 | return -ENOIOCTLCMD; | |
3ff50b79 | 632 | } |
1da177e4 LT |
633 | |
634 | return put_user(answ, (int __user *)arg); | |
635 | } | |
4bc2f18b | 636 | EXPORT_SYMBOL(tcp_ioctl); |
1da177e4 | 637 | |
1da177e4 LT |
638 | static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
639 | { | |
4de075e0 | 640 | TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; |
1da177e4 LT |
641 | tp->pushed_seq = tp->write_seq; |
642 | } | |
643 | ||
a2a385d6 | 644 | static inline bool forced_push(const struct tcp_sock *tp) |
1da177e4 LT |
645 | { |
646 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); | |
647 | } | |
648 | ||
f4a775d1 | 649 | static void skb_entail(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 650 | { |
9e412ba7 | 651 | struct tcp_sock *tp = tcp_sk(sk); |
352d4800 ACM |
652 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
653 | ||
654 | skb->csum = 0; | |
655 | tcb->seq = tcb->end_seq = tp->write_seq; | |
4de075e0 | 656 | tcb->tcp_flags = TCPHDR_ACK; |
352d4800 | 657 | tcb->sacked = 0; |
f4a775d1 | 658 | __skb_header_release(skb); |
fe067e8a | 659 | tcp_add_write_queue_tail(sk, skb); |
3ab224be HA |
660 | sk->sk_wmem_queued += skb->truesize; |
661 | sk_mem_charge(sk, skb->truesize); | |
89ebd197 | 662 | if (tp->nonagle & TCP_NAGLE_PUSH) |
e905a9ed | 663 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
6f021c62 ED |
664 | |
665 | tcp_slow_start_after_idle_check(sk); | |
1da177e4 LT |
666 | } |
667 | ||
afeca340 | 668 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags) |
1da177e4 | 669 | { |
33f5f57e | 670 | if (flags & MSG_OOB) |
1da177e4 | 671 | tp->snd_up = tp->write_seq; |
1da177e4 LT |
672 | } |
673 | ||
f54b3111 | 674 | /* If a not yet filled skb is pushed, do not send it if |
a181ceb5 | 675 | * we have data packets in Qdisc or NIC queues : |
f54b3111 ED |
676 | * Because TX completion will happen shortly, it gives a chance |
677 | * to coalesce future sendmsg() payload into this skb, without | |
678 | * need for a timer, and with no latency trade off. | |
679 | * As packets containing data payload have a bigger truesize | |
a181ceb5 ED |
680 | * than pure acks (dataless) packets, the last checks prevent |
681 | * autocorking if we only have an ACK in Qdisc/NIC queues, | |
682 | * or if TX completion was delayed after we processed ACK packet. | |
f54b3111 ED |
683 | */ |
684 | static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb, | |
685 | int size_goal) | |
1da177e4 | 686 | { |
f54b3111 | 687 | return skb->len < size_goal && |
790f00e1 | 688 | sock_net(sk)->ipv4.sysctl_tcp_autocorking && |
114f39fe | 689 | !tcp_rtx_queue_empty(sk) && |
14afee4b | 690 | refcount_read(&sk->sk_wmem_alloc) > skb->truesize; |
f54b3111 ED |
691 | } |
692 | ||
693 | static void tcp_push(struct sock *sk, int flags, int mss_now, | |
694 | int nonagle, int size_goal) | |
695 | { | |
696 | struct tcp_sock *tp = tcp_sk(sk); | |
697 | struct sk_buff *skb; | |
afeca340 | 698 | |
f54b3111 | 699 | skb = tcp_write_queue_tail(sk); |
75c119af ED |
700 | if (!skb) |
701 | return; | |
f54b3111 ED |
702 | if (!(flags & MSG_MORE) || forced_push(tp)) |
703 | tcp_mark_push(tp, skb); | |
704 | ||
705 | tcp_mark_urg(tp, flags); | |
706 | ||
707 | if (tcp_should_autocork(sk, skb, size_goal)) { | |
708 | ||
709 | /* avoid atomic op if TSQ_THROTTLED bit is already set */ | |
7aa5470c | 710 | if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) { |
f54b3111 | 711 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING); |
7aa5470c | 712 | set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags); |
f54b3111 | 713 | } |
a181ceb5 ED |
714 | /* It is possible TX completion already happened |
715 | * before we set TSQ_THROTTLED. | |
716 | */ | |
14afee4b | 717 | if (refcount_read(&sk->sk_wmem_alloc) > skb->truesize) |
a181ceb5 | 718 | return; |
1da177e4 | 719 | } |
f54b3111 ED |
720 | |
721 | if (flags & MSG_MORE) | |
722 | nonagle = TCP_NAGLE_CORK; | |
723 | ||
724 | __tcp_push_pending_frames(sk, mss_now, nonagle); | |
1da177e4 LT |
725 | } |
726 | ||
6ff7751d AB |
727 | static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
728 | unsigned int offset, size_t len) | |
9c55e01c JA |
729 | { |
730 | struct tcp_splice_state *tss = rd_desc->arg.data; | |
33966dd0 | 731 | int ret; |
9c55e01c | 732 | |
a60e3cc7 | 733 | ret = skb_splice_bits(skb, skb->sk, offset, tss->pipe, |
25869262 | 734 | min(rd_desc->count, len), tss->flags); |
33966dd0 WT |
735 | if (ret > 0) |
736 | rd_desc->count -= ret; | |
737 | return ret; | |
9c55e01c JA |
738 | } |
739 | ||
740 | static int __tcp_splice_read(struct sock *sk, struct tcp_splice_state *tss) | |
741 | { | |
742 | /* Store TCP splice context information in read_descriptor_t. */ | |
743 | read_descriptor_t rd_desc = { | |
744 | .arg.data = tss, | |
33966dd0 | 745 | .count = tss->len, |
9c55e01c JA |
746 | }; |
747 | ||
748 | return tcp_read_sock(sk, &rd_desc, tcp_splice_data_recv); | |
749 | } | |
750 | ||
751 | /** | |
752 | * tcp_splice_read - splice data from TCP socket to a pipe | |
753 | * @sock: socket to splice from | |
754 | * @ppos: position (not valid) | |
755 | * @pipe: pipe to splice to | |
756 | * @len: number of bytes to splice | |
757 | * @flags: splice modifier flags | |
758 | * | |
759 | * Description: | |
760 | * Will read pages from given socket and fill them into a pipe. | |
761 | * | |
762 | **/ | |
763 | ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos, | |
764 | struct pipe_inode_info *pipe, size_t len, | |
765 | unsigned int flags) | |
766 | { | |
767 | struct sock *sk = sock->sk; | |
768 | struct tcp_splice_state tss = { | |
769 | .pipe = pipe, | |
770 | .len = len, | |
771 | .flags = flags, | |
772 | }; | |
773 | long timeo; | |
774 | ssize_t spliced; | |
775 | int ret; | |
776 | ||
3a047bf8 | 777 | sock_rps_record_flow(sk); |
9c55e01c JA |
778 | /* |
779 | * We can't seek on a socket input | |
780 | */ | |
781 | if (unlikely(*ppos)) | |
782 | return -ESPIPE; | |
783 | ||
784 | ret = spliced = 0; | |
785 | ||
786 | lock_sock(sk); | |
787 | ||
42324c62 | 788 | timeo = sock_rcvtimeo(sk, sock->file->f_flags & O_NONBLOCK); |
9c55e01c JA |
789 | while (tss.len) { |
790 | ret = __tcp_splice_read(sk, &tss); | |
791 | if (ret < 0) | |
792 | break; | |
793 | else if (!ret) { | |
794 | if (spliced) | |
795 | break; | |
9c55e01c JA |
796 | if (sock_flag(sk, SOCK_DONE)) |
797 | break; | |
798 | if (sk->sk_err) { | |
799 | ret = sock_error(sk); | |
800 | break; | |
801 | } | |
802 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
803 | break; | |
804 | if (sk->sk_state == TCP_CLOSE) { | |
805 | /* | |
806 | * This occurs when user tries to read | |
807 | * from never connected socket. | |
808 | */ | |
c47078d6 | 809 | ret = -ENOTCONN; |
9c55e01c JA |
810 | break; |
811 | } | |
812 | if (!timeo) { | |
813 | ret = -EAGAIN; | |
814 | break; | |
815 | } | |
ccf7abb9 ED |
816 | /* if __tcp_splice_read() got nothing while we have |
817 | * an skb in receive queue, we do not want to loop. | |
818 | * This might happen with URG data. | |
819 | */ | |
820 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
821 | break; | |
dfbafc99 | 822 | sk_wait_data(sk, &timeo, NULL); |
9c55e01c JA |
823 | if (signal_pending(current)) { |
824 | ret = sock_intr_errno(timeo); | |
825 | break; | |
826 | } | |
827 | continue; | |
828 | } | |
829 | tss.len -= ret; | |
830 | spliced += ret; | |
831 | ||
33966dd0 WT |
832 | if (!timeo) |
833 | break; | |
9c55e01c JA |
834 | release_sock(sk); |
835 | lock_sock(sk); | |
836 | ||
837 | if (sk->sk_err || sk->sk_state == TCP_CLOSE || | |
33966dd0 | 838 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
9c55e01c JA |
839 | signal_pending(current)) |
840 | break; | |
841 | } | |
842 | ||
843 | release_sock(sk); | |
844 | ||
845 | if (spliced) | |
846 | return spliced; | |
847 | ||
848 | return ret; | |
849 | } | |
4bc2f18b | 850 | EXPORT_SYMBOL(tcp_splice_read); |
9c55e01c | 851 | |
eb934478 ED |
852 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
853 | bool force_schedule) | |
f561d0f2 PE |
854 | { |
855 | struct sk_buff *skb; | |
856 | ||
4f661542 ED |
857 | if (likely(!size)) { |
858 | skb = sk->sk_tx_skb_cache; | |
858f5017 | 859 | if (skb) { |
d7cc399e | 860 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
472c2e07 ED |
861 | sk->sk_tx_skb_cache = NULL; |
862 | pskb_trim(skb, 0); | |
863 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); | |
eb70a1ae ED |
864 | skb_shinfo(skb)->tx_flags = 0; |
865 | memset(TCP_SKB_CB(skb), 0, sizeof(struct tcp_skb_cb)); | |
472c2e07 ED |
866 | return skb; |
867 | } | |
868 | } | |
f561d0f2 PE |
869 | /* The TCP header must be at least 32-bit aligned. */ |
870 | size = ALIGN(size, 4); | |
871 | ||
8e4d980a ED |
872 | if (unlikely(tcp_under_memory_pressure(sk))) |
873 | sk_mem_reclaim_partial(sk); | |
874 | ||
f561d0f2 | 875 | skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp); |
8e4d980a | 876 | if (likely(skb)) { |
eb934478 | 877 | bool mem_scheduled; |
8e4d980a | 878 | |
eb934478 ED |
879 | if (force_schedule) { |
880 | mem_scheduled = true; | |
8e4d980a ED |
881 | sk_forced_mem_schedule(sk, skb->truesize); |
882 | } else { | |
eb934478 | 883 | mem_scheduled = sk_wmem_schedule(sk, skb->truesize); |
8e4d980a | 884 | } |
eb934478 | 885 | if (likely(mem_scheduled)) { |
a21d4572 | 886 | skb_reserve(skb, sk->sk_prot->max_header); |
f561d0f2 PE |
887 | /* |
888 | * Make sure that we have exactly size bytes | |
889 | * available to the caller, no more, no less. | |
890 | */ | |
16fad69c | 891 | skb->reserved_tailroom = skb->end - skb->tail - size; |
e2080072 | 892 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); |
f561d0f2 PE |
893 | return skb; |
894 | } | |
895 | __kfree_skb(skb); | |
896 | } else { | |
5c52ba17 | 897 | sk->sk_prot->enter_memory_pressure(sk); |
f561d0f2 PE |
898 | sk_stream_moderate_sndbuf(sk); |
899 | } | |
900 | return NULL; | |
901 | } | |
902 | ||
0c54b85f IJ |
903 | static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, |
904 | int large_allowed) | |
905 | { | |
906 | struct tcp_sock *tp = tcp_sk(sk); | |
6c09fa09 | 907 | u32 new_size_goal, size_goal; |
605ad7f1 | 908 | |
74d4a8f8 | 909 | if (!large_allowed) |
605ad7f1 ED |
910 | return mss_now; |
911 | ||
6c09fa09 ED |
912 | /* Note : tcp_tso_autosize() will eventually split this later */ |
913 | new_size_goal = sk->sk_gso_max_size - 1 - MAX_TCP_HEADER; | |
605ad7f1 ED |
914 | new_size_goal = tcp_bound_to_half_wnd(tp, new_size_goal); |
915 | ||
916 | /* We try hard to avoid divides here */ | |
917 | size_goal = tp->gso_segs * mss_now; | |
918 | if (unlikely(new_size_goal < size_goal || | |
919 | new_size_goal >= size_goal + mss_now)) { | |
920 | tp->gso_segs = min_t(u16, new_size_goal / mss_now, | |
921 | sk->sk_gso_max_segs); | |
922 | size_goal = tp->gso_segs * mss_now; | |
0c54b85f IJ |
923 | } |
924 | ||
605ad7f1 | 925 | return max(size_goal, mss_now); |
0c54b85f IJ |
926 | } |
927 | ||
928 | static int tcp_send_mss(struct sock *sk, int *size_goal, int flags) | |
929 | { | |
930 | int mss_now; | |
931 | ||
932 | mss_now = tcp_current_mss(sk); | |
933 | *size_goal = tcp_xmit_size_goal(sk, mss_now, !(flags & MSG_OOB)); | |
934 | ||
935 | return mss_now; | |
936 | } | |
937 | ||
fdfc5c85 ED |
938 | /* In some cases, both sendpage() and sendmsg() could have added |
939 | * an skb to the write queue, but failed adding payload on it. | |
940 | * We need to remove it to consume less memory, but more | |
941 | * importantly be able to generate EPOLLOUT for Edge Trigger epoll() | |
942 | * users. | |
943 | */ | |
944 | static void tcp_remove_empty_skb(struct sock *sk, struct sk_buff *skb) | |
945 | { | |
946 | if (skb && !skb->len) { | |
947 | tcp_unlink_write_queue(skb, sk); | |
948 | if (tcp_write_queue_empty(sk)) | |
949 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
950 | sk_wmem_free_skb(sk, skb); | |
951 | } | |
952 | } | |
953 | ||
e3b5616a DW |
954 | ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, |
955 | size_t size, int flags) | |
1da177e4 LT |
956 | { |
957 | struct tcp_sock *tp = tcp_sk(sk); | |
c1b4a7e6 | 958 | int mss_now, size_goal; |
1da177e4 LT |
959 | int err; |
960 | ssize_t copied; | |
961 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
962 | ||
a10674bf VA |
963 | if (IS_ENABLED(CONFIG_DEBUG_VM) && |
964 | WARN_ONCE(PageSlab(page), "page must not be a Slab one")) | |
965 | return -EINVAL; | |
966 | ||
8336886f JC |
967 | /* Wait for a connection to finish. One exception is TCP Fast Open |
968 | * (passive side) where data is allowed to be sent before a connection | |
969 | * is fully established. | |
970 | */ | |
971 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
972 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
973 | err = sk_stream_wait_connect(sk, &timeo); |
974 | if (err != 0) | |
1da177e4 | 975 | goto out_err; |
8336886f | 976 | } |
1da177e4 | 977 | |
9cd3e072 | 978 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 979 | |
0c54b85f | 980 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
981 | copied = 0; |
982 | ||
983 | err = -EPIPE; | |
984 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
0d6a775e | 985 | goto out_err; |
1da177e4 | 986 | |
64022d0b | 987 | while (size > 0) { |
fe067e8a | 988 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
38ba0a65 | 989 | int copy, i; |
38ba0a65 | 990 | bool can_coalesce; |
1da177e4 | 991 | |
75c119af | 992 | if (!skb || (copy = size_goal - skb->len) <= 0 || |
c134ecb8 | 993 | !tcp_skb_can_collapse_to(skb)) { |
1da177e4 LT |
994 | new_segment: |
995 | if (!sk_stream_memory_free(sk)) | |
996 | goto wait_for_sndbuf; | |
997 | ||
eb934478 | 998 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, |
75c119af | 999 | tcp_rtx_and_write_queues_empty(sk)); |
1da177e4 LT |
1000 | if (!skb) |
1001 | goto wait_for_memory; | |
1002 | ||
41477662 JK |
1003 | #ifdef CONFIG_TLS_DEVICE |
1004 | skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED); | |
1005 | #endif | |
9e412ba7 | 1006 | skb_entail(sk, skb); |
c1b4a7e6 | 1007 | copy = size_goal; |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | if (copy > size) | |
1011 | copy = size; | |
1012 | ||
1013 | i = skb_shinfo(skb)->nr_frags; | |
1014 | can_coalesce = skb_can_coalesce(skb, i, page, offset); | |
5f74f82e | 1015 | if (!can_coalesce && i >= sysctl_max_skb_frags) { |
1da177e4 LT |
1016 | tcp_mark_push(tp, skb); |
1017 | goto new_segment; | |
1018 | } | |
3ab224be | 1019 | if (!sk_wmem_schedule(sk, copy)) |
1da177e4 | 1020 | goto wait_for_memory; |
e905a9ed | 1021 | |
1da177e4 | 1022 | if (can_coalesce) { |
9e903e08 | 1023 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
1da177e4 LT |
1024 | } else { |
1025 | get_page(page); | |
1026 | skb_fill_page_desc(skb, i, page, offset, copy); | |
1027 | } | |
312fc2b4 JF |
1028 | |
1029 | if (!(flags & MSG_NO_SHARED_FRAGS)) | |
1030 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; | |
cef401de | 1031 | |
1da177e4 LT |
1032 | skb->len += copy; |
1033 | skb->data_len += copy; | |
1034 | skb->truesize += copy; | |
1035 | sk->sk_wmem_queued += copy; | |
3ab224be | 1036 | sk_mem_charge(sk, copy); |
84fa7933 | 1037 | skb->ip_summed = CHECKSUM_PARTIAL; |
1da177e4 LT |
1038 | tp->write_seq += copy; |
1039 | TCP_SKB_CB(skb)->end_seq += copy; | |
cd7d8498 | 1040 | tcp_skb_pcount_set(skb, 0); |
1da177e4 LT |
1041 | |
1042 | if (!copied) | |
4de075e0 | 1043 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; |
1da177e4 LT |
1044 | |
1045 | copied += copy; | |
64022d0b | 1046 | offset += copy; |
686a5624 | 1047 | size -= copy; |
ad02c4f5 | 1048 | if (!size) |
1da177e4 LT |
1049 | goto out; |
1050 | ||
69d15067 | 1051 | if (skb->len < size_goal || (flags & MSG_OOB)) |
1da177e4 LT |
1052 | continue; |
1053 | ||
1054 | if (forced_push(tp)) { | |
1055 | tcp_mark_push(tp, skb); | |
9e412ba7 | 1056 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
fe067e8a | 1057 | } else if (skb == tcp_send_head(sk)) |
1da177e4 LT |
1058 | tcp_push_one(sk, mss_now); |
1059 | continue; | |
1060 | ||
1061 | wait_for_sndbuf: | |
1062 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1063 | wait_for_memory: | |
f54b3111 ED |
1064 | tcp_push(sk, flags & ~MSG_MORE, mss_now, |
1065 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1066 | |
686a5624 YM |
1067 | err = sk_stream_wait_memory(sk, &timeo); |
1068 | if (err != 0) | |
1da177e4 LT |
1069 | goto do_error; |
1070 | ||
0c54b85f | 1071 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1072 | } |
1073 | ||
1074 | out: | |
ad02c4f5 | 1075 | if (copied) { |
4e8cc228 | 1076 | tcp_tx_timestamp(sk, sk->sk_tsflags); |
ad02c4f5 SHY |
1077 | if (!(flags & MSG_SENDPAGE_NOTLAST)) |
1078 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); | |
1079 | } | |
1da177e4 LT |
1080 | return copied; |
1081 | ||
1082 | do_error: | |
fdfc5c85 | 1083 | tcp_remove_empty_skb(sk, tcp_write_queue_tail(sk)); |
1da177e4 LT |
1084 | if (copied) |
1085 | goto out; | |
1086 | out_err: | |
ce5ec440 | 1087 | /* make sure we wake any epoll edge trigger waiter */ |
b0f71bd3 FY |
1088 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && |
1089 | err == -EAGAIN)) { | |
ce5ec440 | 1090 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1091 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1092 | } | |
1da177e4 LT |
1093 | return sk_stream_error(sk, flags, err); |
1094 | } | |
e3b5616a | 1095 | EXPORT_SYMBOL_GPL(do_tcp_sendpages); |
1da177e4 | 1096 | |
306b13eb TH |
1097 | int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, |
1098 | size_t size, int flags) | |
1da177e4 | 1099 | { |
dead7cdb | 1100 | if (!(sk->sk_route_caps & NETIF_F_SG)) |
bd9dfc54 | 1101 | return sock_no_sendpage_locked(sk, page, offset, size, flags); |
1da177e4 | 1102 | |
d7722e85 SHY |
1103 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1104 | ||
306b13eb TH |
1105 | return do_tcp_sendpages(sk, page, offset, size, flags); |
1106 | } | |
774c4673 | 1107 | EXPORT_SYMBOL_GPL(tcp_sendpage_locked); |
306b13eb TH |
1108 | |
1109 | int tcp_sendpage(struct sock *sk, struct page *page, int offset, | |
1110 | size_t size, int flags) | |
1111 | { | |
1112 | int ret; | |
1113 | ||
1114 | lock_sock(sk); | |
1115 | ret = tcp_sendpage_locked(sk, page, offset, size, flags); | |
1da177e4 | 1116 | release_sock(sk); |
306b13eb TH |
1117 | |
1118 | return ret; | |
1da177e4 | 1119 | } |
4bc2f18b | 1120 | EXPORT_SYMBOL(tcp_sendpage); |
1da177e4 | 1121 | |
cf60af03 YC |
1122 | void tcp_free_fastopen_req(struct tcp_sock *tp) |
1123 | { | |
00db4124 | 1124 | if (tp->fastopen_req) { |
cf60af03 YC |
1125 | kfree(tp->fastopen_req); |
1126 | tp->fastopen_req = NULL; | |
1127 | } | |
1128 | } | |
1129 | ||
f5ddcbbb | 1130 | static int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, |
f859a448 WB |
1131 | int *copied, size_t size, |
1132 | struct ubuf_info *uarg) | |
cf60af03 YC |
1133 | { |
1134 | struct tcp_sock *tp = tcp_sk(sk); | |
19f6d3f3 | 1135 | struct inet_sock *inet = inet_sk(sk); |
ba615f67 | 1136 | struct sockaddr *uaddr = msg->msg_name; |
cf60af03 YC |
1137 | int err, flags; |
1138 | ||
e1cfcbe8 | 1139 | if (!(sock_net(sk)->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) || |
ba615f67 WW |
1140 | (uaddr && msg->msg_namelen >= sizeof(uaddr->sa_family) && |
1141 | uaddr->sa_family == AF_UNSPEC)) | |
cf60af03 | 1142 | return -EOPNOTSUPP; |
00db4124 | 1143 | if (tp->fastopen_req) |
cf60af03 YC |
1144 | return -EALREADY; /* Another Fast Open is in progress */ |
1145 | ||
1146 | tp->fastopen_req = kzalloc(sizeof(struct tcp_fastopen_request), | |
1147 | sk->sk_allocation); | |
51456b29 | 1148 | if (unlikely(!tp->fastopen_req)) |
cf60af03 YC |
1149 | return -ENOBUFS; |
1150 | tp->fastopen_req->data = msg; | |
f5ddcbbb | 1151 | tp->fastopen_req->size = size; |
f859a448 | 1152 | tp->fastopen_req->uarg = uarg; |
cf60af03 | 1153 | |
19f6d3f3 WW |
1154 | if (inet->defer_connect) { |
1155 | err = tcp_connect(sk); | |
1156 | /* Same failure procedure as in tcp_v4/6_connect */ | |
1157 | if (err) { | |
1158 | tcp_set_state(sk, TCP_CLOSE); | |
1159 | inet->inet_dport = 0; | |
1160 | sk->sk_route_caps = 0; | |
1161 | } | |
1162 | } | |
cf60af03 | 1163 | flags = (msg->msg_flags & MSG_DONTWAIT) ? O_NONBLOCK : 0; |
ba615f67 | 1164 | err = __inet_stream_connect(sk->sk_socket, uaddr, |
3979ad7e | 1165 | msg->msg_namelen, flags, 1); |
7db92362 WW |
1166 | /* fastopen_req could already be freed in __inet_stream_connect |
1167 | * if the connection times out or gets rst | |
1168 | */ | |
1169 | if (tp->fastopen_req) { | |
1170 | *copied = tp->fastopen_req->copied; | |
1171 | tcp_free_fastopen_req(tp); | |
1172 | inet->defer_connect = 0; | |
1173 | } | |
cf60af03 YC |
1174 | return err; |
1175 | } | |
1176 | ||
306b13eb | 1177 | int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) |
1da177e4 | 1178 | { |
1da177e4 | 1179 | struct tcp_sock *tp = tcp_sk(sk); |
f214f915 | 1180 | struct ubuf_info *uarg = NULL; |
1da177e4 | 1181 | struct sk_buff *skb; |
c14ac945 | 1182 | struct sockcm_cookie sockc; |
57be5bda AV |
1183 | int flags, err, copied = 0; |
1184 | int mss_now = 0, size_goal, copied_syn = 0; | |
1a991488 | 1185 | int process_backlog = 0; |
74d4a8f8 | 1186 | bool zc = false; |
1da177e4 LT |
1187 | long timeo; |
1188 | ||
1da177e4 | 1189 | flags = msg->msg_flags; |
f214f915 | 1190 | |
5cf4a853 | 1191 | if (flags & MSG_ZEROCOPY && size && sock_flag(sk, SOCK_ZEROCOPY)) { |
75c119af | 1192 | skb = tcp_write_queue_tail(sk); |
f214f915 WB |
1193 | uarg = sock_zerocopy_realloc(sk, size, skb_zcopy(skb)); |
1194 | if (!uarg) { | |
1195 | err = -ENOBUFS; | |
1196 | goto out_err; | |
1197 | } | |
1198 | ||
dead7cdb | 1199 | zc = sk->sk_route_caps & NETIF_F_SG; |
02583ade | 1200 | if (!zc) |
f214f915 WB |
1201 | uarg->zerocopy = 0; |
1202 | } | |
1203 | ||
16ae6aa1 YC |
1204 | if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) && |
1205 | !tp->repair) { | |
f859a448 | 1206 | err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size, uarg); |
cf60af03 YC |
1207 | if (err == -EINPROGRESS && copied_syn > 0) |
1208 | goto out; | |
1209 | else if (err) | |
1210 | goto out_err; | |
cf60af03 YC |
1211 | } |
1212 | ||
1da177e4 LT |
1213 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
1214 | ||
d7722e85 SHY |
1215 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1216 | ||
8336886f JC |
1217 | /* Wait for a connection to finish. One exception is TCP Fast Open |
1218 | * (passive side) where data is allowed to be sent before a connection | |
1219 | * is fully established. | |
1220 | */ | |
1221 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
1222 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
1223 | err = sk_stream_wait_connect(sk, &timeo); |
1224 | if (err != 0) | |
cf60af03 | 1225 | goto do_error; |
8336886f | 1226 | } |
1da177e4 | 1227 | |
c0e88ff0 PE |
1228 | if (unlikely(tp->repair)) { |
1229 | if (tp->repair_queue == TCP_RECV_QUEUE) { | |
1230 | copied = tcp_send_rcvq(sk, msg, size); | |
5924f17a | 1231 | goto out_nopush; |
c0e88ff0 PE |
1232 | } |
1233 | ||
1234 | err = -EINVAL; | |
1235 | if (tp->repair_queue == TCP_NO_QUEUE) | |
1236 | goto out_err; | |
1237 | ||
1238 | /* 'common' sending to sendq */ | |
1239 | } | |
1240 | ||
657a0667 | 1241 | sockcm_init(&sockc, sk); |
c14ac945 SHY |
1242 | if (msg->msg_controllen) { |
1243 | err = sock_cmsg_send(sk, msg, &sockc); | |
1244 | if (unlikely(err)) { | |
1245 | err = -EINVAL; | |
1246 | goto out_err; | |
1247 | } | |
1248 | } | |
1249 | ||
1da177e4 | 1250 | /* This should be in poll */ |
9cd3e072 | 1251 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 1252 | |
1da177e4 | 1253 | /* Ok commence sending. */ |
1da177e4 LT |
1254 | copied = 0; |
1255 | ||
d41a69f1 ED |
1256 | restart: |
1257 | mss_now = tcp_send_mss(sk, &size_goal, flags); | |
1258 | ||
1da177e4 LT |
1259 | err = -EPIPE; |
1260 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
79d8665b | 1261 | goto do_error; |
1da177e4 | 1262 | |
01e97e65 | 1263 | while (msg_data_left(msg)) { |
57be5bda | 1264 | int copy = 0; |
1da177e4 | 1265 | |
57be5bda | 1266 | skb = tcp_write_queue_tail(sk); |
65ec6097 ED |
1267 | if (skb) |
1268 | copy = size_goal - skb->len; | |
1da177e4 | 1269 | |
c134ecb8 | 1270 | if (copy <= 0 || !tcp_skb_can_collapse_to(skb)) { |
3613b3db ED |
1271 | bool first_skb; |
1272 | ||
1da177e4 | 1273 | new_segment: |
57be5bda AV |
1274 | if (!sk_stream_memory_free(sk)) |
1275 | goto wait_for_sndbuf; | |
1da177e4 | 1276 | |
1a991488 ED |
1277 | if (unlikely(process_backlog >= 16)) { |
1278 | process_backlog = 0; | |
1279 | if (sk_flush_backlog(sk)) | |
1280 | goto restart; | |
d4011239 | 1281 | } |
75c119af | 1282 | first_skb = tcp_rtx_and_write_queues_empty(sk); |
472c2e07 | 1283 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, |
3613b3db | 1284 | first_skb); |
57be5bda AV |
1285 | if (!skb) |
1286 | goto wait_for_memory; | |
1da177e4 | 1287 | |
1a991488 | 1288 | process_backlog++; |
dead7cdb | 1289 | skb->ip_summed = CHECKSUM_PARTIAL; |
1da177e4 | 1290 | |
57be5bda AV |
1291 | skb_entail(sk, skb); |
1292 | copy = size_goal; | |
9d186cac | 1293 | |
57be5bda | 1294 | /* All packets are restored as if they have |
d3edd06e | 1295 | * already been sent. skb_mstamp_ns isn't set to |
57be5bda AV |
1296 | * avoid wrong rtt estimation. |
1297 | */ | |
1298 | if (tp->repair) | |
1299 | TCP_SKB_CB(skb)->sacked |= TCPCB_REPAIRED; | |
1300 | } | |
1da177e4 | 1301 | |
57be5bda | 1302 | /* Try to append data to the end of skb. */ |
01e97e65 AV |
1303 | if (copy > msg_data_left(msg)) |
1304 | copy = msg_data_left(msg); | |
57be5bda AV |
1305 | |
1306 | /* Where to copy to? */ | |
02583ade | 1307 | if (skb_availroom(skb) > 0 && !zc) { |
57be5bda AV |
1308 | /* We have some space in skb head. Superb! */ |
1309 | copy = min_t(int, copy, skb_availroom(skb)); | |
1310 | err = skb_add_data_nocache(sk, skb, &msg->msg_iter, copy); | |
1311 | if (err) | |
1312 | goto do_fault; | |
02583ade | 1313 | } else if (!zc) { |
57be5bda AV |
1314 | bool merge = true; |
1315 | int i = skb_shinfo(skb)->nr_frags; | |
1316 | struct page_frag *pfrag = sk_page_frag(sk); | |
1317 | ||
1318 | if (!sk_page_frag_refill(sk, pfrag)) | |
1319 | goto wait_for_memory; | |
ef015786 | 1320 | |
57be5bda AV |
1321 | if (!skb_can_coalesce(skb, i, pfrag->page, |
1322 | pfrag->offset)) { | |
74d4a8f8 | 1323 | if (i >= sysctl_max_skb_frags) { |
57be5bda AV |
1324 | tcp_mark_push(tp, skb); |
1325 | goto new_segment; | |
1da177e4 | 1326 | } |
57be5bda | 1327 | merge = false; |
1da177e4 LT |
1328 | } |
1329 | ||
57be5bda AV |
1330 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
1331 | ||
1332 | if (!sk_wmem_schedule(sk, copy)) | |
1333 | goto wait_for_memory; | |
1da177e4 | 1334 | |
57be5bda AV |
1335 | err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb, |
1336 | pfrag->page, | |
1337 | pfrag->offset, | |
1338 | copy); | |
1339 | if (err) | |
1340 | goto do_error; | |
1da177e4 | 1341 | |
57be5bda AV |
1342 | /* Update the skb. */ |
1343 | if (merge) { | |
1344 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1345 | } else { | |
1346 | skb_fill_page_desc(skb, i, pfrag->page, | |
1347 | pfrag->offset, copy); | |
4e33e346 | 1348 | page_ref_inc(pfrag->page); |
4ed2d765 | 1349 | } |
57be5bda | 1350 | pfrag->offset += copy; |
f214f915 WB |
1351 | } else { |
1352 | err = skb_zerocopy_iter_stream(sk, skb, msg, copy, uarg); | |
111856c7 WB |
1353 | if (err == -EMSGSIZE || err == -EEXIST) { |
1354 | tcp_mark_push(tp, skb); | |
f214f915 | 1355 | goto new_segment; |
111856c7 | 1356 | } |
f214f915 WB |
1357 | if (err < 0) |
1358 | goto do_error; | |
1359 | copy = err; | |
57be5bda AV |
1360 | } |
1361 | ||
1362 | if (!copied) | |
1363 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; | |
1364 | ||
1365 | tp->write_seq += copy; | |
1366 | TCP_SKB_CB(skb)->end_seq += copy; | |
1367 | tcp_skb_pcount_set(skb, 0); | |
1da177e4 | 1368 | |
57be5bda | 1369 | copied += copy; |
01e97e65 | 1370 | if (!msg_data_left(msg)) { |
c134ecb8 MKL |
1371 | if (unlikely(flags & MSG_EOR)) |
1372 | TCP_SKB_CB(skb)->eor = 1; | |
57be5bda AV |
1373 | goto out; |
1374 | } | |
1da177e4 | 1375 | |
65ec6097 | 1376 | if (skb->len < size_goal || (flags & MSG_OOB) || unlikely(tp->repair)) |
1da177e4 LT |
1377 | continue; |
1378 | ||
57be5bda AV |
1379 | if (forced_push(tp)) { |
1380 | tcp_mark_push(tp, skb); | |
1381 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); | |
1382 | } else if (skb == tcp_send_head(sk)) | |
1383 | tcp_push_one(sk, mss_now); | |
1384 | continue; | |
1385 | ||
1da177e4 | 1386 | wait_for_sndbuf: |
57be5bda | 1387 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1da177e4 | 1388 | wait_for_memory: |
57be5bda AV |
1389 | if (copied) |
1390 | tcp_push(sk, flags & ~MSG_MORE, mss_now, | |
1391 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1392 | |
686a5624 YM |
1393 | err = sk_stream_wait_memory(sk, &timeo); |
1394 | if (err != 0) | |
57be5bda | 1395 | goto do_error; |
1da177e4 | 1396 | |
57be5bda | 1397 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1398 | } |
1399 | ||
1400 | out: | |
ad02c4f5 | 1401 | if (copied) { |
4e8cc228 | 1402 | tcp_tx_timestamp(sk, sockc.tsflags); |
f54b3111 | 1403 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); |
ad02c4f5 | 1404 | } |
5924f17a | 1405 | out_nopush: |
f214f915 | 1406 | sock_zerocopy_put(uarg); |
cf60af03 | 1407 | return copied + copied_syn; |
1da177e4 | 1408 | |
fdfc5c85 ED |
1409 | do_error: |
1410 | skb = tcp_write_queue_tail(sk); | |
1da177e4 | 1411 | do_fault: |
fdfc5c85 | 1412 | tcp_remove_empty_skb(sk, skb); |
1da177e4 | 1413 | |
cf60af03 | 1414 | if (copied + copied_syn) |
1da177e4 LT |
1415 | goto out; |
1416 | out_err: | |
52900d22 | 1417 | sock_zerocopy_put_abort(uarg, true); |
1da177e4 | 1418 | err = sk_stream_error(sk, flags, err); |
ce5ec440 | 1419 | /* make sure we wake any epoll edge trigger waiter */ |
b0f71bd3 FY |
1420 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && |
1421 | err == -EAGAIN)) { | |
ce5ec440 | 1422 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1423 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1424 | } | |
1da177e4 LT |
1425 | return err; |
1426 | } | |
774c4673 | 1427 | EXPORT_SYMBOL_GPL(tcp_sendmsg_locked); |
306b13eb TH |
1428 | |
1429 | int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
1430 | { | |
1431 | int ret; | |
1432 | ||
1433 | lock_sock(sk); | |
1434 | ret = tcp_sendmsg_locked(sk, msg, size); | |
1435 | release_sock(sk); | |
1436 | ||
1437 | return ret; | |
1438 | } | |
4bc2f18b | 1439 | EXPORT_SYMBOL(tcp_sendmsg); |
1da177e4 LT |
1440 | |
1441 | /* | |
1442 | * Handle reading urgent data. BSD has very simple semantics for | |
1443 | * this, no blocking and very strange errors 8) | |
1444 | */ | |
1445 | ||
377f0a08 | 1446 | static int tcp_recv_urg(struct sock *sk, struct msghdr *msg, int len, int flags) |
1da177e4 LT |
1447 | { |
1448 | struct tcp_sock *tp = tcp_sk(sk); | |
1449 | ||
1450 | /* No URG data to read. */ | |
1451 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || | |
1452 | tp->urg_data == TCP_URG_READ) | |
1453 | return -EINVAL; /* Yes this is right ! */ | |
1454 | ||
1455 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) | |
1456 | return -ENOTCONN; | |
1457 | ||
1458 | if (tp->urg_data & TCP_URG_VALID) { | |
1459 | int err = 0; | |
1460 | char c = tp->urg_data; | |
1461 | ||
1462 | if (!(flags & MSG_PEEK)) | |
1463 | tp->urg_data = TCP_URG_READ; | |
1464 | ||
1465 | /* Read urgent data. */ | |
1466 | msg->msg_flags |= MSG_OOB; | |
1467 | ||
1468 | if (len > 0) { | |
1469 | if (!(flags & MSG_TRUNC)) | |
7eab8d9e | 1470 | err = memcpy_to_msg(msg, &c, 1); |
1da177e4 LT |
1471 | len = 1; |
1472 | } else | |
1473 | msg->msg_flags |= MSG_TRUNC; | |
1474 | ||
1475 | return err ? -EFAULT : len; | |
1476 | } | |
1477 | ||
1478 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1479 | return 0; | |
1480 | ||
1481 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and | |
1482 | * the available implementations agree in this case: | |
1483 | * this call should never block, independent of the | |
1484 | * blocking state of the socket. | |
1485 | * Mike <pall@rz.uni-karlsruhe.de> | |
1486 | */ | |
1487 | return -EAGAIN; | |
1488 | } | |
1489 | ||
c0e88ff0 PE |
1490 | static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len) |
1491 | { | |
1492 | struct sk_buff *skb; | |
1493 | int copied = 0, err = 0; | |
1494 | ||
1495 | /* XXX -- need to support SO_PEEK_OFF */ | |
1496 | ||
75c119af ED |
1497 | skb_rbtree_walk(skb, &sk->tcp_rtx_queue) { |
1498 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); | |
1499 | if (err) | |
1500 | return err; | |
1501 | copied += skb->len; | |
1502 | } | |
1503 | ||
c0e88ff0 | 1504 | skb_queue_walk(&sk->sk_write_queue, skb) { |
51f3d02b | 1505 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); |
c0e88ff0 PE |
1506 | if (err) |
1507 | break; | |
1508 | ||
1509 | copied += skb->len; | |
1510 | } | |
1511 | ||
1512 | return err ?: copied; | |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | /* Clean up the receive buffer for full frames taken by the user, |
1516 | * then send an ACK if necessary. COPIED is the number of bytes | |
1517 | * tcp_recvmsg has given to the user so far, it speeds up the | |
1518 | * calculation of whether or not we must ACK for the sake of | |
1519 | * a window update. | |
1520 | */ | |
3f334078 | 1521 | static void tcp_cleanup_rbuf(struct sock *sk, int copied) |
1da177e4 LT |
1522 | { |
1523 | struct tcp_sock *tp = tcp_sk(sk); | |
a2a385d6 | 1524 | bool time_to_ack = false; |
1da177e4 | 1525 | |
1da177e4 LT |
1526 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
1527 | ||
d792c100 | 1528 | WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq), |
2af6fd8b | 1529 | "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n", |
d792c100 | 1530 | tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt); |
1da177e4 | 1531 | |
463c84b9 ACM |
1532 | if (inet_csk_ack_scheduled(sk)) { |
1533 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
1da177e4 LT |
1534 | /* Delayed ACKs frequently hit locked sockets during bulk |
1535 | * receive. */ | |
463c84b9 | 1536 | if (icsk->icsk_ack.blocked || |
1da177e4 | 1537 | /* Once-per-two-segments ACK was not sent by tcp_input.c */ |
463c84b9 | 1538 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
1da177e4 LT |
1539 | /* |
1540 | * If this read emptied read buffer, we send ACK, if | |
1541 | * connection is not bidirectional, user drained | |
1542 | * receive buffer and there was a small segment | |
1543 | * in queue. | |
1544 | */ | |
1ef9696c AK |
1545 | (copied > 0 && |
1546 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) || | |
1547 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && | |
31954cd8 | 1548 | !inet_csk_in_pingpong_mode(sk))) && |
1ef9696c | 1549 | !atomic_read(&sk->sk_rmem_alloc))) |
a2a385d6 | 1550 | time_to_ack = true; |
1da177e4 LT |
1551 | } |
1552 | ||
1553 | /* We send an ACK if we can now advertise a non-zero window | |
1554 | * which has been raised "significantly". | |
1555 | * | |
1556 | * Even if window raised up to infinity, do not send window open ACK | |
1557 | * in states, where we will not receive more. It is useless. | |
1558 | */ | |
1559 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
1560 | __u32 rcv_window_now = tcp_receive_window(tp); | |
1561 | ||
1562 | /* Optimize, __tcp_select_window() is not cheap. */ | |
1563 | if (2*rcv_window_now <= tp->window_clamp) { | |
1564 | __u32 new_window = __tcp_select_window(sk); | |
1565 | ||
1566 | /* Send ACK now, if this read freed lots of space | |
1567 | * in our buffer. Certainly, new_window is new window. | |
1568 | * We can advertise it now, if it is not less than current one. | |
1569 | * "Lots" means "at least twice" here. | |
1570 | */ | |
1571 | if (new_window && new_window >= 2 * rcv_window_now) | |
a2a385d6 | 1572 | time_to_ack = true; |
1da177e4 LT |
1573 | } |
1574 | } | |
1575 | if (time_to_ack) | |
1576 | tcp_send_ack(sk); | |
1577 | } | |
1578 | ||
f26845b4 | 1579 | static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
1da177e4 LT |
1580 | { |
1581 | struct sk_buff *skb; | |
1582 | u32 offset; | |
1583 | ||
f26845b4 | 1584 | while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) { |
1da177e4 | 1585 | offset = seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
1586 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
1587 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 1588 | offset--; |
9d691539 | 1589 | } |
e11ecddf | 1590 | if (offset < skb->len || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) { |
1da177e4 LT |
1591 | *off = offset; |
1592 | return skb; | |
1593 | } | |
f26845b4 ED |
1594 | /* This looks weird, but this can happen if TCP collapsing |
1595 | * splitted a fat GRO packet, while we released socket lock | |
1596 | * in skb_splice_bits() | |
1597 | */ | |
7bced397 | 1598 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1599 | } |
1600 | return NULL; | |
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * This routine provides an alternative to tcp_recvmsg() for routines | |
1605 | * that would like to handle copying from skbuffs directly in 'sendfile' | |
1606 | * fashion. | |
1607 | * Note: | |
1608 | * - It is assumed that the socket was locked by the caller. | |
1609 | * - The routine does not block. | |
1610 | * - At present, there is no support for reading OOB data | |
1611 | * or for 'peeking' the socket using this routine | |
1612 | * (although both would be easy to implement). | |
1613 | */ | |
1614 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, | |
1615 | sk_read_actor_t recv_actor) | |
1616 | { | |
1617 | struct sk_buff *skb; | |
1618 | struct tcp_sock *tp = tcp_sk(sk); | |
1619 | u32 seq = tp->copied_seq; | |
1620 | u32 offset; | |
1621 | int copied = 0; | |
1622 | ||
1623 | if (sk->sk_state == TCP_LISTEN) | |
1624 | return -ENOTCONN; | |
1625 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { | |
1626 | if (offset < skb->len) { | |
374e7b59 OP |
1627 | int used; |
1628 | size_t len; | |
1da177e4 LT |
1629 | |
1630 | len = skb->len - offset; | |
1631 | /* Stop reading if we hit a patch of urgent data */ | |
1632 | if (tp->urg_data) { | |
1633 | u32 urg_offset = tp->urg_seq - seq; | |
1634 | if (urg_offset < len) | |
1635 | len = urg_offset; | |
1636 | if (!len) | |
1637 | break; | |
1638 | } | |
1639 | used = recv_actor(desc, skb, offset, len); | |
ff905b1e | 1640 | if (used <= 0) { |
ddb61a57 JA |
1641 | if (!copied) |
1642 | copied = used; | |
1643 | break; | |
1644 | } else if (used <= len) { | |
1da177e4 LT |
1645 | seq += used; |
1646 | copied += used; | |
1647 | offset += used; | |
1648 | } | |
02275a2e | 1649 | /* If recv_actor drops the lock (e.g. TCP splice |
293ad604 OP |
1650 | * receive) the skb pointer might be invalid when |
1651 | * getting here: tcp_collapse might have deleted it | |
1652 | * while aggregating skbs from the socket queue. | |
1653 | */ | |
02275a2e WT |
1654 | skb = tcp_recv_skb(sk, seq - 1, &offset); |
1655 | if (!skb) | |
1da177e4 | 1656 | break; |
02275a2e WT |
1657 | /* TCP coalescing might have appended data to the skb. |
1658 | * Try to splice more frags | |
1659 | */ | |
1660 | if (offset + 1 != skb->len) | |
1661 | continue; | |
1da177e4 | 1662 | } |
e11ecddf | 1663 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) { |
7bced397 | 1664 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1665 | ++seq; |
1666 | break; | |
1667 | } | |
7bced397 | 1668 | sk_eat_skb(sk, skb); |
1da177e4 LT |
1669 | if (!desc->count) |
1670 | break; | |
baff42ab | 1671 | tp->copied_seq = seq; |
1da177e4 LT |
1672 | } |
1673 | tp->copied_seq = seq; | |
1674 | ||
1675 | tcp_rcv_space_adjust(sk); | |
1676 | ||
1677 | /* Clean up data we have read: This will do ACK frames. */ | |
f26845b4 ED |
1678 | if (copied > 0) { |
1679 | tcp_recv_skb(sk, seq, &offset); | |
0e4b4992 | 1680 | tcp_cleanup_rbuf(sk, copied); |
f26845b4 | 1681 | } |
1da177e4 LT |
1682 | return copied; |
1683 | } | |
4bc2f18b | 1684 | EXPORT_SYMBOL(tcp_read_sock); |
1da177e4 | 1685 | |
32035585 TH |
1686 | int tcp_peek_len(struct socket *sock) |
1687 | { | |
1688 | return tcp_inq(sock->sk); | |
1689 | } | |
1690 | EXPORT_SYMBOL(tcp_peek_len); | |
1691 | ||
d1361840 ED |
1692 | /* Make sure sk_rcvbuf is big enough to satisfy SO_RCVLOWAT hint */ |
1693 | int tcp_set_rcvlowat(struct sock *sk, int val) | |
1694 | { | |
867f816b SHY |
1695 | int cap; |
1696 | ||
1697 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) | |
1698 | cap = sk->sk_rcvbuf >> 1; | |
1699 | else | |
1700 | cap = sock_net(sk)->ipv4.sysctl_tcp_rmem[2] >> 1; | |
1701 | val = min(val, cap); | |
eac66402 | 1702 | WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
03f45c88 ED |
1703 | |
1704 | /* Check if we need to signal EPOLLIN right now */ | |
1705 | tcp_data_ready(sk); | |
1706 | ||
d1361840 ED |
1707 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
1708 | return 0; | |
1709 | ||
d1361840 | 1710 | val <<= 1; |
d1361840 ED |
1711 | if (val > sk->sk_rcvbuf) { |
1712 | sk->sk_rcvbuf = val; | |
1713 | tcp_sk(sk)->window_clamp = tcp_win_from_space(sk, val); | |
1714 | } | |
1715 | return 0; | |
1716 | } | |
1717 | EXPORT_SYMBOL(tcp_set_rcvlowat); | |
1718 | ||
05255b82 ED |
1719 | #ifdef CONFIG_MMU |
1720 | static const struct vm_operations_struct tcp_vm_ops = { | |
1721 | }; | |
1722 | ||
93ab6cc6 ED |
1723 | int tcp_mmap(struct file *file, struct socket *sock, |
1724 | struct vm_area_struct *vma) | |
1725 | { | |
05255b82 ED |
1726 | if (vma->vm_flags & (VM_WRITE | VM_EXEC)) |
1727 | return -EPERM; | |
1728 | vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC); | |
1729 | ||
1730 | /* Instruct vm_insert_page() to not down_read(mmap_sem) */ | |
1731 | vma->vm_flags |= VM_MIXEDMAP; | |
1732 | ||
1733 | vma->vm_ops = &tcp_vm_ops; | |
1734 | return 0; | |
1735 | } | |
1736 | EXPORT_SYMBOL(tcp_mmap); | |
1737 | ||
1738 | static int tcp_zerocopy_receive(struct sock *sk, | |
1739 | struct tcp_zerocopy_receive *zc) | |
1740 | { | |
1741 | unsigned long address = (unsigned long)zc->address; | |
1742 | const skb_frag_t *frags = NULL; | |
1743 | u32 length = 0, seq, offset; | |
1744 | struct vm_area_struct *vma; | |
1745 | struct sk_buff *skb = NULL; | |
93ab6cc6 | 1746 | struct tcp_sock *tp; |
8f2b0293 | 1747 | int inq; |
93ab6cc6 ED |
1748 | int ret; |
1749 | ||
05255b82 | 1750 | if (address & (PAGE_SIZE - 1) || address != zc->address) |
93ab6cc6 ED |
1751 | return -EINVAL; |
1752 | ||
93ab6cc6 | 1753 | if (sk->sk_state == TCP_LISTEN) |
05255b82 | 1754 | return -ENOTCONN; |
93ab6cc6 ED |
1755 | |
1756 | sock_rps_record_flow(sk); | |
1757 | ||
05255b82 ED |
1758 | down_read(¤t->mm->mmap_sem); |
1759 | ||
1760 | ret = -EINVAL; | |
1761 | vma = find_vma(current->mm, address); | |
1762 | if (!vma || vma->vm_start > address || vma->vm_ops != &tcp_vm_ops) | |
93ab6cc6 | 1763 | goto out; |
05255b82 ED |
1764 | zc->length = min_t(unsigned long, zc->length, vma->vm_end - address); |
1765 | ||
93ab6cc6 ED |
1766 | tp = tcp_sk(sk); |
1767 | seq = tp->copied_seq; | |
8f2b0293 SHY |
1768 | inq = tcp_inq(sk); |
1769 | zc->length = min_t(u32, zc->length, inq); | |
05255b82 | 1770 | zc->length &= ~(PAGE_SIZE - 1); |
8f2b0293 SHY |
1771 | if (zc->length) { |
1772 | zap_page_range(vma, address, zc->length); | |
1773 | zc->recv_skip_hint = 0; | |
1774 | } else { | |
1775 | zc->recv_skip_hint = inq; | |
1776 | } | |
05255b82 ED |
1777 | ret = 0; |
1778 | while (length + PAGE_SIZE <= zc->length) { | |
1779 | if (zc->recv_skip_hint < PAGE_SIZE) { | |
1780 | if (skb) { | |
1781 | skb = skb->next; | |
1782 | offset = seq - TCP_SKB_CB(skb)->seq; | |
1783 | } else { | |
1784 | skb = tcp_recv_skb(sk, seq, &offset); | |
1785 | } | |
1786 | ||
1787 | zc->recv_skip_hint = skb->len - offset; | |
1788 | offset -= skb_headlen(skb); | |
1789 | if ((int)offset < 0 || skb_has_frag_list(skb)) | |
1790 | break; | |
1791 | frags = skb_shinfo(skb)->frags; | |
1792 | while (offset) { | |
d8e18a51 | 1793 | if (skb_frag_size(frags) > offset) |
05255b82 | 1794 | goto out; |
d8e18a51 | 1795 | offset -= skb_frag_size(frags); |
05255b82 ED |
1796 | frags++; |
1797 | } | |
93ab6cc6 | 1798 | } |
b54c9d5b | 1799 | if (skb_frag_size(frags) != PAGE_SIZE || skb_frag_off(frags)) { |
789762ce SHY |
1800 | int remaining = zc->recv_skip_hint; |
1801 | ||
3afb0961 | 1802 | while (remaining && (skb_frag_size(frags) != PAGE_SIZE || |
b54c9d5b | 1803 | skb_frag_off(frags))) { |
3afb0961 | 1804 | remaining -= skb_frag_size(frags); |
789762ce SHY |
1805 | frags++; |
1806 | } | |
1807 | zc->recv_skip_hint -= remaining; | |
05255b82 | 1808 | break; |
789762ce | 1809 | } |
05255b82 ED |
1810 | ret = vm_insert_page(vma, address + length, |
1811 | skb_frag_page(frags)); | |
93ab6cc6 | 1812 | if (ret) |
05255b82 ED |
1813 | break; |
1814 | length += PAGE_SIZE; | |
1815 | seq += PAGE_SIZE; | |
1816 | zc->recv_skip_hint -= PAGE_SIZE; | |
1817 | frags++; | |
93ab6cc6 | 1818 | } |
93ab6cc6 | 1819 | out: |
05255b82 ED |
1820 | up_read(¤t->mm->mmap_sem); |
1821 | if (length) { | |
1822 | tp->copied_seq = seq; | |
1823 | tcp_rcv_space_adjust(sk); | |
1824 | ||
1825 | /* Clean up data we have read: This will do ACK frames. */ | |
1826 | tcp_recv_skb(sk, seq, &offset); | |
1827 | tcp_cleanup_rbuf(sk, length); | |
1828 | ret = 0; | |
1829 | if (length == zc->length) | |
1830 | zc->recv_skip_hint = 0; | |
1831 | } else { | |
1832 | if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE)) | |
1833 | ret = -EIO; | |
1834 | } | |
1835 | zc->length = length; | |
93ab6cc6 ED |
1836 | return ret; |
1837 | } | |
05255b82 | 1838 | #endif |
93ab6cc6 | 1839 | |
98aaa913 | 1840 | static void tcp_update_recv_tstamps(struct sk_buff *skb, |
9718475e | 1841 | struct scm_timestamping_internal *tss) |
98aaa913 MM |
1842 | { |
1843 | if (skb->tstamp) | |
9718475e | 1844 | tss->ts[0] = ktime_to_timespec64(skb->tstamp); |
98aaa913 | 1845 | else |
9718475e | 1846 | tss->ts[0] = (struct timespec64) {0}; |
98aaa913 MM |
1847 | |
1848 | if (skb_hwtstamps(skb)->hwtstamp) | |
9718475e | 1849 | tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp); |
98aaa913 | 1850 | else |
9718475e | 1851 | tss->ts[2] = (struct timespec64) {0}; |
98aaa913 MM |
1852 | } |
1853 | ||
1854 | /* Similar to __sock_recv_timestamp, but does not require an skb */ | |
809a79e9 | 1855 | static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk, |
9718475e | 1856 | struct scm_timestamping_internal *tss) |
98aaa913 | 1857 | { |
887feae3 | 1858 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
98aaa913 MM |
1859 | bool has_timestamping = false; |
1860 | ||
1861 | if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) { | |
1862 | if (sock_flag(sk, SOCK_RCVTSTAMP)) { | |
1863 | if (sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 DD |
1864 | if (new_tstamp) { |
1865 | struct __kernel_timespec kts = {tss->ts[0].tv_sec, tss->ts[0].tv_nsec}; | |
1866 | ||
1867 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, | |
1868 | sizeof(kts), &kts); | |
1869 | } else { | |
9718475e DD |
1870 | struct timespec ts_old = timespec64_to_timespec(tss->ts[0]); |
1871 | ||
887feae3 | 1872 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, |
9718475e | 1873 | sizeof(ts_old), &ts_old); |
887feae3 | 1874 | } |
98aaa913 | 1875 | } else { |
887feae3 DD |
1876 | if (new_tstamp) { |
1877 | struct __kernel_sock_timeval stv; | |
1878 | ||
1879 | stv.tv_sec = tss->ts[0].tv_sec; | |
1880 | stv.tv_usec = tss->ts[0].tv_nsec / 1000; | |
1881 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, | |
1882 | sizeof(stv), &stv); | |
1883 | } else { | |
1884 | struct __kernel_old_timeval tv; | |
1885 | ||
1886 | tv.tv_sec = tss->ts[0].tv_sec; | |
1887 | tv.tv_usec = tss->ts[0].tv_nsec / 1000; | |
1888 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, | |
1889 | sizeof(tv), &tv); | |
1890 | } | |
98aaa913 MM |
1891 | } |
1892 | } | |
1893 | ||
1894 | if (sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) | |
1895 | has_timestamping = true; | |
1896 | else | |
9718475e | 1897 | tss->ts[0] = (struct timespec64) {0}; |
98aaa913 MM |
1898 | } |
1899 | ||
1900 | if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) { | |
1901 | if (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) | |
1902 | has_timestamping = true; | |
1903 | else | |
9718475e | 1904 | tss->ts[2] = (struct timespec64) {0}; |
98aaa913 MM |
1905 | } |
1906 | ||
1907 | if (has_timestamping) { | |
9718475e DD |
1908 | tss->ts[1] = (struct timespec64) {0}; |
1909 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) | |
1910 | put_cmsg_scm_timestamping64(msg, tss); | |
1911 | else | |
1912 | put_cmsg_scm_timestamping(msg, tss); | |
98aaa913 MM |
1913 | } |
1914 | } | |
1915 | ||
b75eba76 SHY |
1916 | static int tcp_inq_hint(struct sock *sk) |
1917 | { | |
1918 | const struct tcp_sock *tp = tcp_sk(sk); | |
1919 | u32 copied_seq = READ_ONCE(tp->copied_seq); | |
1920 | u32 rcv_nxt = READ_ONCE(tp->rcv_nxt); | |
1921 | int inq; | |
1922 | ||
1923 | inq = rcv_nxt - copied_seq; | |
1924 | if (unlikely(inq < 0 || copied_seq != READ_ONCE(tp->copied_seq))) { | |
1925 | lock_sock(sk); | |
1926 | inq = tp->rcv_nxt - tp->copied_seq; | |
1927 | release_sock(sk); | |
1928 | } | |
6466e715 SHY |
1929 | /* After receiving a FIN, tell the user-space to continue reading |
1930 | * by returning a non-zero inq. | |
1931 | */ | |
1932 | if (inq == 0 && sock_flag(sk, SOCK_DONE)) | |
1933 | inq = 1; | |
b75eba76 SHY |
1934 | return inq; |
1935 | } | |
1936 | ||
1da177e4 LT |
1937 | /* |
1938 | * This routine copies from a sock struct into the user buffer. | |
1939 | * | |
1940 | * Technical note: in 2.3 we work on _locked_ socket, so that | |
1941 | * tricks with *seq access order and skb->users are not required. | |
1942 | * Probably, code can be easily improved even more. | |
1943 | */ | |
1944 | ||
1b784140 YX |
1945 | int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
1946 | int flags, int *addr_len) | |
1da177e4 LT |
1947 | { |
1948 | struct tcp_sock *tp = tcp_sk(sk); | |
1949 | int copied = 0; | |
1950 | u32 peek_seq; | |
1951 | u32 *seq; | |
1952 | unsigned long used; | |
b75eba76 | 1953 | int err, inq; |
1da177e4 LT |
1954 | int target; /* Read at least this many bytes */ |
1955 | long timeo; | |
dfbafc99 | 1956 | struct sk_buff *skb, *last; |
77527313 | 1957 | u32 urg_hole = 0; |
9718475e | 1958 | struct scm_timestamping_internal tss; |
98aaa913 | 1959 | bool has_tss = false; |
b75eba76 | 1960 | bool has_cmsg; |
1da177e4 | 1961 | |
4ed2d765 | 1962 | if (unlikely(flags & MSG_ERRQUEUE)) |
f4713a3d | 1963 | return inet_recv_error(sk, msg, len, addr_len); |
4ed2d765 | 1964 | |
cbf55001 ET |
1965 | if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) && |
1966 | (sk->sk_state == TCP_ESTABLISHED)) | |
1967 | sk_busy_loop(sk, nonblock); | |
d30e383b | 1968 | |
1da177e4 LT |
1969 | lock_sock(sk); |
1970 | ||
1da177e4 LT |
1971 | err = -ENOTCONN; |
1972 | if (sk->sk_state == TCP_LISTEN) | |
1973 | goto out; | |
1974 | ||
b75eba76 | 1975 | has_cmsg = tp->recvmsg_inq; |
1da177e4 LT |
1976 | timeo = sock_rcvtimeo(sk, nonblock); |
1977 | ||
1978 | /* Urgent data needs to be handled specially. */ | |
1979 | if (flags & MSG_OOB) | |
1980 | goto recv_urg; | |
1981 | ||
c0e88ff0 PE |
1982 | if (unlikely(tp->repair)) { |
1983 | err = -EPERM; | |
1984 | if (!(flags & MSG_PEEK)) | |
1985 | goto out; | |
1986 | ||
1987 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
1988 | goto recv_sndq; | |
1989 | ||
1990 | err = -EINVAL; | |
1991 | if (tp->repair_queue == TCP_NO_QUEUE) | |
1992 | goto out; | |
1993 | ||
1994 | /* 'common' recv queue MSG_PEEK-ing */ | |
1995 | } | |
1996 | ||
1da177e4 LT |
1997 | seq = &tp->copied_seq; |
1998 | if (flags & MSG_PEEK) { | |
1999 | peek_seq = tp->copied_seq; | |
2000 | seq = &peek_seq; | |
2001 | } | |
2002 | ||
2003 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
2004 | ||
2005 | do { | |
1da177e4 LT |
2006 | u32 offset; |
2007 | ||
2008 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ | |
2009 | if (tp->urg_data && tp->urg_seq == *seq) { | |
2010 | if (copied) | |
2011 | break; | |
2012 | if (signal_pending(current)) { | |
2013 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
2014 | break; | |
2015 | } | |
2016 | } | |
2017 | ||
2018 | /* Next get a buffer. */ | |
2019 | ||
dfbafc99 | 2020 | last = skb_peek_tail(&sk->sk_receive_queue); |
91521944 | 2021 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
dfbafc99 | 2022 | last = skb; |
1da177e4 LT |
2023 | /* Now that we have two receive queues this |
2024 | * shouldn't happen. | |
2025 | */ | |
d792c100 | 2026 | if (WARN(before(*seq, TCP_SKB_CB(skb)->seq), |
e56b8ce3 | 2027 | "TCP recvmsg seq # bug: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b JP |
2028 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, |
2029 | flags)) | |
1da177e4 | 2030 | break; |
d792c100 | 2031 | |
1da177e4 | 2032 | offset = *seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
2033 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
2034 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 2035 | offset--; |
9d691539 | 2036 | } |
1da177e4 LT |
2037 | if (offset < skb->len) |
2038 | goto found_ok_skb; | |
e11ecddf | 2039 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2040 | goto found_fin_ok; |
2af6fd8b | 2041 | WARN(!(flags & MSG_PEEK), |
e56b8ce3 | 2042 | "TCP recvmsg seq # bug 2: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b | 2043 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, flags); |
91521944 | 2044 | } |
1da177e4 LT |
2045 | |
2046 | /* Well, if we have backlog, try to process it now yet. */ | |
2047 | ||
2048 | if (copied >= target && !sk->sk_backlog.tail) | |
2049 | break; | |
2050 | ||
2051 | if (copied) { | |
2052 | if (sk->sk_err || | |
2053 | sk->sk_state == TCP_CLOSE || | |
2054 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
2055 | !timeo || | |
518a09ef | 2056 | signal_pending(current)) |
1da177e4 LT |
2057 | break; |
2058 | } else { | |
2059 | if (sock_flag(sk, SOCK_DONE)) | |
2060 | break; | |
2061 | ||
2062 | if (sk->sk_err) { | |
2063 | copied = sock_error(sk); | |
2064 | break; | |
2065 | } | |
2066 | ||
2067 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2068 | break; | |
2069 | ||
2070 | if (sk->sk_state == TCP_CLOSE) { | |
c47078d6 ED |
2071 | /* This occurs when user tries to read |
2072 | * from never connected socket. | |
2073 | */ | |
2074 | copied = -ENOTCONN; | |
1da177e4 LT |
2075 | break; |
2076 | } | |
2077 | ||
2078 | if (!timeo) { | |
2079 | copied = -EAGAIN; | |
2080 | break; | |
2081 | } | |
2082 | ||
2083 | if (signal_pending(current)) { | |
2084 | copied = sock_intr_errno(timeo); | |
2085 | break; | |
2086 | } | |
2087 | } | |
2088 | ||
0e4b4992 | 2089 | tcp_cleanup_rbuf(sk, copied); |
1da177e4 | 2090 | |
1da177e4 LT |
2091 | if (copied >= target) { |
2092 | /* Do not sleep, just process backlog. */ | |
2093 | release_sock(sk); | |
2094 | lock_sock(sk); | |
dfbafc99 SD |
2095 | } else { |
2096 | sk_wait_data(sk, &timeo, last); | |
2097 | } | |
1da177e4 | 2098 | |
77527313 IJ |
2099 | if ((flags & MSG_PEEK) && |
2100 | (peek_seq - copied - urg_hole != tp->copied_seq)) { | |
e87cc472 JP |
2101 | net_dbg_ratelimited("TCP(%s:%d): Application bug, race in MSG_PEEK\n", |
2102 | current->comm, | |
2103 | task_pid_nr(current)); | |
1da177e4 LT |
2104 | peek_seq = tp->copied_seq; |
2105 | } | |
2106 | continue; | |
2107 | ||
fdb8b298 | 2108 | found_ok_skb: |
1da177e4 LT |
2109 | /* Ok so how much can we use? */ |
2110 | used = skb->len - offset; | |
2111 | if (len < used) | |
2112 | used = len; | |
2113 | ||
2114 | /* Do we have urgent data here? */ | |
2115 | if (tp->urg_data) { | |
2116 | u32 urg_offset = tp->urg_seq - *seq; | |
2117 | if (urg_offset < used) { | |
2118 | if (!urg_offset) { | |
2119 | if (!sock_flag(sk, SOCK_URGINLINE)) { | |
2120 | ++*seq; | |
77527313 | 2121 | urg_hole++; |
1da177e4 LT |
2122 | offset++; |
2123 | used--; | |
2124 | if (!used) | |
2125 | goto skip_copy; | |
2126 | } | |
2127 | } else | |
2128 | used = urg_offset; | |
2129 | } | |
2130 | } | |
2131 | ||
2132 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 2133 | err = skb_copy_datagram_msg(skb, offset, msg, used); |
7bced397 DW |
2134 | if (err) { |
2135 | /* Exception. Bailout! */ | |
2136 | if (!copied) | |
2137 | copied = -EFAULT; | |
2138 | break; | |
1da177e4 LT |
2139 | } |
2140 | } | |
2141 | ||
2142 | *seq += used; | |
2143 | copied += used; | |
2144 | len -= used; | |
2145 | ||
2146 | tcp_rcv_space_adjust(sk); | |
2147 | ||
2148 | skip_copy: | |
31770e34 | 2149 | if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) { |
1da177e4 | 2150 | tp->urg_data = 0; |
31770e34 FW |
2151 | tcp_fast_path_check(sk); |
2152 | } | |
1da177e4 LT |
2153 | if (used + offset < skb->len) |
2154 | continue; | |
2155 | ||
98aaa913 MM |
2156 | if (TCP_SKB_CB(skb)->has_rxtstamp) { |
2157 | tcp_update_recv_tstamps(skb, &tss); | |
2158 | has_tss = true; | |
b75eba76 | 2159 | has_cmsg = true; |
98aaa913 | 2160 | } |
e11ecddf | 2161 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2162 | goto found_fin_ok; |
7bced397 DW |
2163 | if (!(flags & MSG_PEEK)) |
2164 | sk_eat_skb(sk, skb); | |
1da177e4 LT |
2165 | continue; |
2166 | ||
fdb8b298 | 2167 | found_fin_ok: |
1da177e4 LT |
2168 | /* Process the FIN. */ |
2169 | ++*seq; | |
7bced397 DW |
2170 | if (!(flags & MSG_PEEK)) |
2171 | sk_eat_skb(sk, skb); | |
1da177e4 LT |
2172 | break; |
2173 | } while (len > 0); | |
2174 | ||
1da177e4 LT |
2175 | /* According to UNIX98, msg_name/msg_namelen are ignored |
2176 | * on connected socket. I was just happy when found this 8) --ANK | |
2177 | */ | |
2178 | ||
2179 | /* Clean up data we have read: This will do ACK frames. */ | |
0e4b4992 | 2180 | tcp_cleanup_rbuf(sk, copied); |
1da177e4 | 2181 | |
1da177e4 | 2182 | release_sock(sk); |
b75eba76 SHY |
2183 | |
2184 | if (has_cmsg) { | |
2185 | if (has_tss) | |
2186 | tcp_recv_timestamp(msg, sk, &tss); | |
2187 | if (tp->recvmsg_inq) { | |
2188 | inq = tcp_inq_hint(sk); | |
2189 | put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq); | |
2190 | } | |
2191 | } | |
2192 | ||
1da177e4 LT |
2193 | return copied; |
2194 | ||
2195 | out: | |
1da177e4 LT |
2196 | release_sock(sk); |
2197 | return err; | |
2198 | ||
2199 | recv_urg: | |
377f0a08 | 2200 | err = tcp_recv_urg(sk, msg, len, flags); |
1da177e4 | 2201 | goto out; |
c0e88ff0 PE |
2202 | |
2203 | recv_sndq: | |
2204 | err = tcp_peek_sndq(sk, msg, len); | |
2205 | goto out; | |
1da177e4 | 2206 | } |
4bc2f18b | 2207 | EXPORT_SYMBOL(tcp_recvmsg); |
1da177e4 | 2208 | |
490d5046 IJ |
2209 | void tcp_set_state(struct sock *sk, int state) |
2210 | { | |
2211 | int oldstate = sk->sk_state; | |
2212 | ||
d4487491 LB |
2213 | /* We defined a new enum for TCP states that are exported in BPF |
2214 | * so as not force the internal TCP states to be frozen. The | |
2215 | * following checks will detect if an internal state value ever | |
2216 | * differs from the BPF value. If this ever happens, then we will | |
2217 | * need to remap the internal value to the BPF value before calling | |
2218 | * tcp_call_bpf_2arg. | |
2219 | */ | |
2220 | BUILD_BUG_ON((int)BPF_TCP_ESTABLISHED != (int)TCP_ESTABLISHED); | |
2221 | BUILD_BUG_ON((int)BPF_TCP_SYN_SENT != (int)TCP_SYN_SENT); | |
2222 | BUILD_BUG_ON((int)BPF_TCP_SYN_RECV != (int)TCP_SYN_RECV); | |
2223 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT1 != (int)TCP_FIN_WAIT1); | |
2224 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT2 != (int)TCP_FIN_WAIT2); | |
2225 | BUILD_BUG_ON((int)BPF_TCP_TIME_WAIT != (int)TCP_TIME_WAIT); | |
2226 | BUILD_BUG_ON((int)BPF_TCP_CLOSE != (int)TCP_CLOSE); | |
2227 | BUILD_BUG_ON((int)BPF_TCP_CLOSE_WAIT != (int)TCP_CLOSE_WAIT); | |
2228 | BUILD_BUG_ON((int)BPF_TCP_LAST_ACK != (int)TCP_LAST_ACK); | |
2229 | BUILD_BUG_ON((int)BPF_TCP_LISTEN != (int)TCP_LISTEN); | |
2230 | BUILD_BUG_ON((int)BPF_TCP_CLOSING != (int)TCP_CLOSING); | |
2231 | BUILD_BUG_ON((int)BPF_TCP_NEW_SYN_RECV != (int)TCP_NEW_SYN_RECV); | |
2232 | BUILD_BUG_ON((int)BPF_TCP_MAX_STATES != (int)TCP_MAX_STATES); | |
2233 | ||
2234 | if (BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk), BPF_SOCK_OPS_STATE_CB_FLAG)) | |
2235 | tcp_call_bpf_2arg(sk, BPF_SOCK_OPS_STATE_CB, oldstate, state); | |
e8fce239 | 2236 | |
490d5046 IJ |
2237 | switch (state) { |
2238 | case TCP_ESTABLISHED: | |
2239 | if (oldstate != TCP_ESTABLISHED) | |
81cc8a75 | 2240 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2241 | break; |
2242 | ||
2243 | case TCP_CLOSE: | |
2244 | if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) | |
81cc8a75 | 2245 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ESTABRESETS); |
490d5046 IJ |
2246 | |
2247 | sk->sk_prot->unhash(sk); | |
2248 | if (inet_csk(sk)->icsk_bind_hash && | |
2249 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 2250 | inet_put_port(sk); |
490d5046 IJ |
2251 | /* fall through */ |
2252 | default: | |
5a5f3a8d | 2253 | if (oldstate == TCP_ESTABLISHED) |
74688e48 | 2254 | TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2255 | } |
2256 | ||
2257 | /* Change state AFTER socket is unhashed to avoid closed | |
2258 | * socket sitting in hash tables. | |
2259 | */ | |
563e0bb0 | 2260 | inet_sk_state_store(sk, state); |
490d5046 IJ |
2261 | } |
2262 | EXPORT_SYMBOL_GPL(tcp_set_state); | |
2263 | ||
1da177e4 LT |
2264 | /* |
2265 | * State processing on a close. This implements the state shift for | |
2266 | * sending our FIN frame. Note that we only send a FIN for some | |
2267 | * states. A shutdown() may have already sent the FIN, or we may be | |
2268 | * closed. | |
2269 | */ | |
2270 | ||
9b5b5cff | 2271 | static const unsigned char new_state[16] = { |
1da177e4 | 2272 | /* current state: new state: action: */ |
0980c1e3 ED |
2273 | [0 /* (Invalid) */] = TCP_CLOSE, |
2274 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2275 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2276 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2277 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2278 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2279 | [TCP_TIME_WAIT] = TCP_CLOSE, | |
2280 | [TCP_CLOSE] = TCP_CLOSE, | |
2281 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2282 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2283 | [TCP_LISTEN] = TCP_CLOSE, | |
2284 | [TCP_CLOSING] = TCP_CLOSING, | |
2285 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
1da177e4 LT |
2286 | }; |
2287 | ||
2288 | static int tcp_close_state(struct sock *sk) | |
2289 | { | |
2290 | int next = (int)new_state[sk->sk_state]; | |
2291 | int ns = next & TCP_STATE_MASK; | |
2292 | ||
2293 | tcp_set_state(sk, ns); | |
2294 | ||
2295 | return next & TCP_ACTION_FIN; | |
2296 | } | |
2297 | ||
2298 | /* | |
2299 | * Shutdown the sending side of a connection. Much like close except | |
1f29b058 | 2300 | * that we don't receive shut down or sock_set_flag(sk, SOCK_DEAD). |
1da177e4 LT |
2301 | */ |
2302 | ||
2303 | void tcp_shutdown(struct sock *sk, int how) | |
2304 | { | |
2305 | /* We need to grab some memory, and put together a FIN, | |
2306 | * and then put it into the queue to be sent. | |
2307 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. | |
2308 | */ | |
2309 | if (!(how & SEND_SHUTDOWN)) | |
2310 | return; | |
2311 | ||
2312 | /* If we've already sent a FIN, or it's a closed state, skip this. */ | |
2313 | if ((1 << sk->sk_state) & | |
2314 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | | |
2315 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { | |
2316 | /* Clear out any half completed packets. FIN if needed. */ | |
2317 | if (tcp_close_state(sk)) | |
2318 | tcp_send_fin(sk); | |
2319 | } | |
2320 | } | |
4bc2f18b | 2321 | EXPORT_SYMBOL(tcp_shutdown); |
1da177e4 | 2322 | |
efcdbf24 AS |
2323 | bool tcp_check_oom(struct sock *sk, int shift) |
2324 | { | |
2325 | bool too_many_orphans, out_of_socket_memory; | |
2326 | ||
2327 | too_many_orphans = tcp_too_many_orphans(sk, shift); | |
2328 | out_of_socket_memory = tcp_out_of_memory(sk); | |
2329 | ||
e87cc472 JP |
2330 | if (too_many_orphans) |
2331 | net_info_ratelimited("too many orphaned sockets\n"); | |
2332 | if (out_of_socket_memory) | |
2333 | net_info_ratelimited("out of memory -- consider tuning tcp_mem\n"); | |
efcdbf24 AS |
2334 | return too_many_orphans || out_of_socket_memory; |
2335 | } | |
2336 | ||
1da177e4 LT |
2337 | void tcp_close(struct sock *sk, long timeout) |
2338 | { | |
2339 | struct sk_buff *skb; | |
2340 | int data_was_unread = 0; | |
75c2d907 | 2341 | int state; |
1da177e4 LT |
2342 | |
2343 | lock_sock(sk); | |
2344 | sk->sk_shutdown = SHUTDOWN_MASK; | |
2345 | ||
2346 | if (sk->sk_state == TCP_LISTEN) { | |
2347 | tcp_set_state(sk, TCP_CLOSE); | |
2348 | ||
2349 | /* Special case. */ | |
0a5578cf | 2350 | inet_csk_listen_stop(sk); |
1da177e4 LT |
2351 | |
2352 | goto adjudge_to_death; | |
2353 | } | |
2354 | ||
2355 | /* We need to flush the recv. buffs. We do this only on the | |
2356 | * descriptor close, not protocol-sourced closes, because the | |
2357 | * reader process may not have drained the data yet! | |
2358 | */ | |
2359 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e11ecddf ED |
2360 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq; |
2361 | ||
2362 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) | |
2363 | len--; | |
1da177e4 LT |
2364 | data_was_unread += len; |
2365 | __kfree_skb(skb); | |
2366 | } | |
2367 | ||
3ab224be | 2368 | sk_mem_reclaim(sk); |
1da177e4 | 2369 | |
565b7b2d KK |
2370 | /* If socket has been already reset (e.g. in tcp_reset()) - kill it. */ |
2371 | if (sk->sk_state == TCP_CLOSE) | |
2372 | goto adjudge_to_death; | |
2373 | ||
65bb723c GR |
2374 | /* As outlined in RFC 2525, section 2.17, we send a RST here because |
2375 | * data was lost. To witness the awful effects of the old behavior of | |
2376 | * always doing a FIN, run an older 2.1.x kernel or 2.0.x, start a bulk | |
2377 | * GET in an FTP client, suspend the process, wait for the client to | |
2378 | * advertise a zero window, then kill -9 the FTP client, wheee... | |
2379 | * Note: timeout is always zero in such a case. | |
1da177e4 | 2380 | */ |
ee995283 PE |
2381 | if (unlikely(tcp_sk(sk)->repair)) { |
2382 | sk->sk_prot->disconnect(sk, 0); | |
2383 | } else if (data_was_unread) { | |
1da177e4 | 2384 | /* Unread data was tossed, zap the connection. */ |
6aef70a8 | 2385 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE); |
1da177e4 | 2386 | tcp_set_state(sk, TCP_CLOSE); |
aa133076 | 2387 | tcp_send_active_reset(sk, sk->sk_allocation); |
1da177e4 LT |
2388 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
2389 | /* Check zero linger _after_ checking for unread data. */ | |
2390 | sk->sk_prot->disconnect(sk, 0); | |
6aef70a8 | 2391 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA); |
1da177e4 LT |
2392 | } else if (tcp_close_state(sk)) { |
2393 | /* We FIN if the application ate all the data before | |
2394 | * zapping the connection. | |
2395 | */ | |
2396 | ||
2397 | /* RED-PEN. Formally speaking, we have broken TCP state | |
2398 | * machine. State transitions: | |
2399 | * | |
2400 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 | |
2401 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) | |
2402 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK | |
2403 | * | |
2404 | * are legal only when FIN has been sent (i.e. in window), | |
2405 | * rather than queued out of window. Purists blame. | |
2406 | * | |
2407 | * F.e. "RFC state" is ESTABLISHED, | |
2408 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. | |
2409 | * | |
2410 | * The visible declinations are that sometimes | |
2411 | * we enter time-wait state, when it is not required really | |
2412 | * (harmless), do not send active resets, when they are | |
2413 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when | |
2414 | * they look as CLOSING or LAST_ACK for Linux) | |
2415 | * Probably, I missed some more holelets. | |
2416 | * --ANK | |
8336886f JC |
2417 | * XXX (TFO) - To start off we don't support SYN+ACK+FIN |
2418 | * in a single packet! (May consider it later but will | |
2419 | * probably need API support or TCP_CORK SYN-ACK until | |
2420 | * data is written and socket is closed.) | |
1da177e4 LT |
2421 | */ |
2422 | tcp_send_fin(sk); | |
2423 | } | |
2424 | ||
2425 | sk_stream_wait_close(sk, timeout); | |
2426 | ||
2427 | adjudge_to_death: | |
75c2d907 HX |
2428 | state = sk->sk_state; |
2429 | sock_hold(sk); | |
2430 | sock_orphan(sk); | |
75c2d907 | 2431 | |
1da177e4 LT |
2432 | local_bh_disable(); |
2433 | bh_lock_sock(sk); | |
8873c064 ED |
2434 | /* remove backlog if any, without releasing ownership. */ |
2435 | __release_sock(sk); | |
1da177e4 | 2436 | |
eb4dea58 HX |
2437 | percpu_counter_inc(sk->sk_prot->orphan_count); |
2438 | ||
75c2d907 HX |
2439 | /* Have we already been destroyed by a softirq or backlog? */ |
2440 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) | |
2441 | goto out; | |
1da177e4 LT |
2442 | |
2443 | /* This is a (useful) BSD violating of the RFC. There is a | |
2444 | * problem with TCP as specified in that the other end could | |
2445 | * keep a socket open forever with no application left this end. | |
b10bd54c | 2446 | * We use a 1 minute timeout (about the same as BSD) then kill |
1da177e4 LT |
2447 | * our end. If they send after that then tough - BUT: long enough |
2448 | * that we won't make the old 4*rto = almost no time - whoops | |
2449 | * reset mistake. | |
2450 | * | |
2451 | * Nope, it was not mistake. It is really desired behaviour | |
2452 | * f.e. on http servers, when such sockets are useless, but | |
2453 | * consume significant resources. Let's do it with special | |
2454 | * linger2 option. --ANK | |
2455 | */ | |
2456 | ||
2457 | if (sk->sk_state == TCP_FIN_WAIT2) { | |
2458 | struct tcp_sock *tp = tcp_sk(sk); | |
2459 | if (tp->linger2 < 0) { | |
2460 | tcp_set_state(sk, TCP_CLOSE); | |
2461 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 2462 | __NET_INC_STATS(sock_net(sk), |
de0744af | 2463 | LINUX_MIB_TCPABORTONLINGER); |
1da177e4 | 2464 | } else { |
463c84b9 | 2465 | const int tmo = tcp_fin_time(sk); |
1da177e4 LT |
2466 | |
2467 | if (tmo > TCP_TIMEWAIT_LEN) { | |
52499afe DM |
2468 | inet_csk_reset_keepalive_timer(sk, |
2469 | tmo - TCP_TIMEWAIT_LEN); | |
1da177e4 | 2470 | } else { |
1da177e4 LT |
2471 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
2472 | goto out; | |
2473 | } | |
2474 | } | |
2475 | } | |
2476 | if (sk->sk_state != TCP_CLOSE) { | |
3ab224be | 2477 | sk_mem_reclaim(sk); |
efcdbf24 | 2478 | if (tcp_check_oom(sk, 0)) { |
1da177e4 LT |
2479 | tcp_set_state(sk, TCP_CLOSE); |
2480 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 2481 | __NET_INC_STATS(sock_net(sk), |
de0744af | 2482 | LINUX_MIB_TCPABORTONMEMORY); |
4ee806d5 DS |
2483 | } else if (!check_net(sock_net(sk))) { |
2484 | /* Not possible to send reset; just close */ | |
2485 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 LT |
2486 | } |
2487 | } | |
1da177e4 | 2488 | |
8336886f | 2489 | if (sk->sk_state == TCP_CLOSE) { |
d983ea6f ED |
2490 | struct request_sock *req; |
2491 | ||
2492 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, | |
2493 | lockdep_sock_is_held(sk)); | |
8336886f JC |
2494 | /* We could get here with a non-NULL req if the socket is |
2495 | * aborted (e.g., closed with unread data) before 3WHS | |
2496 | * finishes. | |
2497 | */ | |
00db4124 | 2498 | if (req) |
8336886f | 2499 | reqsk_fastopen_remove(sk, req, false); |
0a5578cf | 2500 | inet_csk_destroy_sock(sk); |
8336886f | 2501 | } |
1da177e4 LT |
2502 | /* Otherwise, socket is reprieved until protocol close. */ |
2503 | ||
2504 | out: | |
2505 | bh_unlock_sock(sk); | |
2506 | local_bh_enable(); | |
8873c064 | 2507 | release_sock(sk); |
1da177e4 LT |
2508 | sock_put(sk); |
2509 | } | |
4bc2f18b | 2510 | EXPORT_SYMBOL(tcp_close); |
1da177e4 LT |
2511 | |
2512 | /* These states need RST on ABORT according to RFC793 */ | |
2513 | ||
a2a385d6 | 2514 | static inline bool tcp_need_reset(int state) |
1da177e4 LT |
2515 | { |
2516 | return (1 << state) & | |
2517 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | | |
2518 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); | |
2519 | } | |
2520 | ||
75c119af ED |
2521 | static void tcp_rtx_queue_purge(struct sock *sk) |
2522 | { | |
2523 | struct rb_node *p = rb_first(&sk->tcp_rtx_queue); | |
2524 | ||
2525 | while (p) { | |
2526 | struct sk_buff *skb = rb_to_skb(p); | |
2527 | ||
2528 | p = rb_next(p); | |
2529 | /* Since we are deleting whole queue, no need to | |
2530 | * list_del(&skb->tcp_tsorted_anchor) | |
2531 | */ | |
2532 | tcp_rtx_queue_unlink(skb, sk); | |
2533 | sk_wmem_free_skb(sk, skb); | |
2534 | } | |
2535 | } | |
2536 | ||
ac3f09ba ED |
2537 | void tcp_write_queue_purge(struct sock *sk) |
2538 | { | |
2539 | struct sk_buff *skb; | |
2540 | ||
2541 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
2542 | while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
2543 | tcp_skb_tsorted_anchor_cleanup(skb); | |
2544 | sk_wmem_free_skb(sk, skb); | |
2545 | } | |
75c119af | 2546 | tcp_rtx_queue_purge(sk); |
472c2e07 ED |
2547 | skb = sk->sk_tx_skb_cache; |
2548 | if (skb) { | |
472c2e07 ED |
2549 | __kfree_skb(skb); |
2550 | sk->sk_tx_skb_cache = NULL; | |
2551 | } | |
ac3f09ba ED |
2552 | INIT_LIST_HEAD(&tcp_sk(sk)->tsorted_sent_queue); |
2553 | sk_mem_reclaim(sk); | |
2554 | tcp_clear_all_retrans_hints(tcp_sk(sk)); | |
bffd168c | 2555 | tcp_sk(sk)->packets_out = 0; |
04c03114 | 2556 | inet_csk(sk)->icsk_backoff = 0; |
ac3f09ba ED |
2557 | } |
2558 | ||
1da177e4 LT |
2559 | int tcp_disconnect(struct sock *sk, int flags) |
2560 | { | |
2561 | struct inet_sock *inet = inet_sk(sk); | |
463c84b9 | 2562 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 2563 | struct tcp_sock *tp = tcp_sk(sk); |
1da177e4 LT |
2564 | int old_state = sk->sk_state; |
2565 | ||
2566 | if (old_state != TCP_CLOSE) | |
2567 | tcp_set_state(sk, TCP_CLOSE); | |
2568 | ||
2569 | /* ABORT function of RFC793 */ | |
2570 | if (old_state == TCP_LISTEN) { | |
0a5578cf | 2571 | inet_csk_listen_stop(sk); |
ee995283 PE |
2572 | } else if (unlikely(tp->repair)) { |
2573 | sk->sk_err = ECONNABORTED; | |
1da177e4 LT |
2574 | } else if (tcp_need_reset(old_state) || |
2575 | (tp->snd_nxt != tp->write_seq && | |
2576 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { | |
caa20d9a | 2577 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
1da177e4 LT |
2578 | * states |
2579 | */ | |
2580 | tcp_send_active_reset(sk, gfp_any()); | |
2581 | sk->sk_err = ECONNRESET; | |
2582 | } else if (old_state == TCP_SYN_SENT) | |
2583 | sk->sk_err = ECONNRESET; | |
2584 | ||
2585 | tcp_clear_xmit_timers(sk); | |
2586 | __skb_queue_purge(&sk->sk_receive_queue); | |
8b27dae5 ED |
2587 | if (sk->sk_rx_skb_cache) { |
2588 | __kfree_skb(sk->sk_rx_skb_cache); | |
2589 | sk->sk_rx_skb_cache = NULL; | |
2590 | } | |
6508b678 ED |
2591 | tp->copied_seq = tp->rcv_nxt; |
2592 | tp->urg_data = 0; | |
fe067e8a | 2593 | tcp_write_queue_purge(sk); |
cf1ef3f0 | 2594 | tcp_fastopen_active_disable_ofo_check(sk); |
9f5afeae | 2595 | skb_rbtree_purge(&tp->out_of_order_queue); |
1da177e4 | 2596 | |
c720c7e8 | 2597 | inet->inet_dport = 0; |
1da177e4 LT |
2598 | |
2599 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
2600 | inet_reset_saddr(sk); | |
2601 | ||
2602 | sk->sk_shutdown = 0; | |
2603 | sock_reset_flag(sk, SOCK_DONE); | |
740b0f18 | 2604 | tp->srtt_us = 0; |
b9e2e689 | 2605 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
3f6c65d6 | 2606 | tp->rcv_rtt_last_tsecr = 0; |
686a5624 YM |
2607 | tp->write_seq += tp->max_window + 2; |
2608 | if (tp->write_seq == 0) | |
1da177e4 | 2609 | tp->write_seq = 1; |
463c84b9 | 2610 | icsk->icsk_backoff = 0; |
1da177e4 | 2611 | tp->snd_cwnd = 2; |
6687e988 | 2612 | icsk->icsk_probes_out = 0; |
6a408147 | 2613 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
0b6a05c1 | 2614 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
3a9a57f6 | 2615 | tp->snd_cwnd = TCP_INIT_CWND; |
1da177e4 | 2616 | tp->snd_cwnd_cnt = 0; |
1fdf475a | 2617 | tp->window_clamp = 0; |
e21db6f6 | 2618 | tp->delivered_ce = 0; |
6687e988 | 2619 | tcp_set_ca_state(sk, TCP_CA_Open); |
d4761754 | 2620 | tp->is_sack_reneg = 0; |
1da177e4 | 2621 | tcp_clear_retrans(tp); |
463c84b9 | 2622 | inet_csk_delack_init(sk); |
499350a5 WW |
2623 | /* Initialize rcv_mss to TCP_MIN_MSS to avoid division by 0 |
2624 | * issue in __tcp_select_window() | |
2625 | */ | |
2626 | icsk->icsk_ack.rcv_mss = TCP_MIN_MSS; | |
b40b4f79 | 2627 | memset(&tp->rx_opt, 0, sizeof(tp->rx_opt)); |
1da177e4 | 2628 | __sk_dst_reset(sk); |
d747a7a5 WC |
2629 | dst_release(sk->sk_rx_dst); |
2630 | sk->sk_rx_dst = NULL; | |
17c3060b | 2631 | tcp_saved_syn_free(tp); |
5d9f4262 | 2632 | tp->compressed_ack = 0; |
ba113c3a | 2633 | tp->bytes_sent = 0; |
e858faf5 CP |
2634 | tp->bytes_acked = 0; |
2635 | tp->bytes_received = 0; | |
fb31c9b9 | 2636 | tp->bytes_retrans = 0; |
7788174e YC |
2637 | tp->duplicate_sack[0].start_seq = 0; |
2638 | tp->duplicate_sack[0].end_seq = 0; | |
7e10b655 | 2639 | tp->dsack_dups = 0; |
7ec65372 | 2640 | tp->reord_seen = 0; |
5c701549 ED |
2641 | tp->retrans_out = 0; |
2642 | tp->sacked_out = 0; | |
2643 | tp->tlp_high_seq = 0; | |
2644 | tp->last_oow_ack_time = 0; | |
6cda8b74 ED |
2645 | /* There's a bubble in the pipe until at least the first ACK. */ |
2646 | tp->app_limited = ~0U; | |
792c4354 ED |
2647 | tp->rack.mstamp = 0; |
2648 | tp->rack.advanced = 0; | |
2649 | tp->rack.reo_wnd_steps = 1; | |
2650 | tp->rack.last_delivered = 0; | |
2651 | tp->rack.reo_wnd_persist = 0; | |
2652 | tp->rack.dsack_seen = 0; | |
6bcdc40d ED |
2653 | tp->syn_data_acked = 0; |
2654 | tp->rx_opt.saw_tstamp = 0; | |
2655 | tp->rx_opt.dsack = 0; | |
2656 | tp->rx_opt.num_sacks = 0; | |
f9af2dbb | 2657 | tp->rcv_ooopack = 0; |
6cda8b74 | 2658 | |
1da177e4 | 2659 | |
7db92362 WW |
2660 | /* Clean up fastopen related fields */ |
2661 | tcp_free_fastopen_req(tp); | |
2662 | inet->defer_connect = 0; | |
2663 | ||
c720c7e8 | 2664 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
1da177e4 | 2665 | |
9b42d55a LR |
2666 | if (sk->sk_frag.page) { |
2667 | put_page(sk->sk_frag.page); | |
2668 | sk->sk_frag.page = NULL; | |
2669 | sk->sk_frag.offset = 0; | |
2670 | } | |
2671 | ||
1da177e4 | 2672 | sk->sk_error_report(sk); |
a01512b1 | 2673 | return 0; |
1da177e4 | 2674 | } |
4bc2f18b | 2675 | EXPORT_SYMBOL(tcp_disconnect); |
1da177e4 | 2676 | |
a2a385d6 | 2677 | static inline bool tcp_can_repair_sock(const struct sock *sk) |
ee995283 | 2678 | { |
52e804c6 | 2679 | return ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) && |
319b0534 | 2680 | (sk->sk_state != TCP_LISTEN); |
ee995283 PE |
2681 | } |
2682 | ||
b1ed4c4f AV |
2683 | static int tcp_repair_set_window(struct tcp_sock *tp, char __user *optbuf, int len) |
2684 | { | |
2685 | struct tcp_repair_window opt; | |
2686 | ||
2687 | if (!tp->repair) | |
2688 | return -EPERM; | |
2689 | ||
2690 | if (len != sizeof(opt)) | |
2691 | return -EINVAL; | |
2692 | ||
2693 | if (copy_from_user(&opt, optbuf, sizeof(opt))) | |
2694 | return -EFAULT; | |
2695 | ||
2696 | if (opt.max_window < opt.snd_wnd) | |
2697 | return -EINVAL; | |
2698 | ||
2699 | if (after(opt.snd_wl1, tp->rcv_nxt + opt.rcv_wnd)) | |
2700 | return -EINVAL; | |
2701 | ||
2702 | if (after(opt.rcv_wup, tp->rcv_nxt)) | |
2703 | return -EINVAL; | |
2704 | ||
2705 | tp->snd_wl1 = opt.snd_wl1; | |
2706 | tp->snd_wnd = opt.snd_wnd; | |
2707 | tp->max_window = opt.max_window; | |
2708 | ||
2709 | tp->rcv_wnd = opt.rcv_wnd; | |
2710 | tp->rcv_wup = opt.rcv_wup; | |
2711 | ||
2712 | return 0; | |
2713 | } | |
2714 | ||
15e56515 | 2715 | static int tcp_repair_options_est(struct sock *sk, |
de248a75 | 2716 | struct tcp_repair_opt __user *optbuf, unsigned int len) |
b139ba4e | 2717 | { |
15e56515 | 2718 | struct tcp_sock *tp = tcp_sk(sk); |
de248a75 | 2719 | struct tcp_repair_opt opt; |
b139ba4e | 2720 | |
de248a75 PE |
2721 | while (len >= sizeof(opt)) { |
2722 | if (copy_from_user(&opt, optbuf, sizeof(opt))) | |
b139ba4e PE |
2723 | return -EFAULT; |
2724 | ||
2725 | optbuf++; | |
de248a75 | 2726 | len -= sizeof(opt); |
b139ba4e | 2727 | |
de248a75 PE |
2728 | switch (opt.opt_code) { |
2729 | case TCPOPT_MSS: | |
2730 | tp->rx_opt.mss_clamp = opt.opt_val; | |
15e56515 | 2731 | tcp_mtup_init(sk); |
b139ba4e | 2732 | break; |
de248a75 | 2733 | case TCPOPT_WINDOW: |
bc26ccd8 AV |
2734 | { |
2735 | u16 snd_wscale = opt.opt_val & 0xFFFF; | |
2736 | u16 rcv_wscale = opt.opt_val >> 16; | |
2737 | ||
589c49cb | 2738 | if (snd_wscale > TCP_MAX_WSCALE || rcv_wscale > TCP_MAX_WSCALE) |
bc26ccd8 | 2739 | return -EFBIG; |
b139ba4e | 2740 | |
bc26ccd8 AV |
2741 | tp->rx_opt.snd_wscale = snd_wscale; |
2742 | tp->rx_opt.rcv_wscale = rcv_wscale; | |
2743 | tp->rx_opt.wscale_ok = 1; | |
2744 | } | |
b139ba4e | 2745 | break; |
b139ba4e | 2746 | case TCPOPT_SACK_PERM: |
de248a75 PE |
2747 | if (opt.opt_val != 0) |
2748 | return -EINVAL; | |
2749 | ||
b139ba4e | 2750 | tp->rx_opt.sack_ok |= TCP_SACK_SEEN; |
b139ba4e PE |
2751 | break; |
2752 | case TCPOPT_TIMESTAMP: | |
de248a75 PE |
2753 | if (opt.opt_val != 0) |
2754 | return -EINVAL; | |
2755 | ||
b139ba4e PE |
2756 | tp->rx_opt.tstamp_ok = 1; |
2757 | break; | |
2758 | } | |
2759 | } | |
2760 | ||
2761 | return 0; | |
2762 | } | |
2763 | ||
a842fe14 ED |
2764 | DEFINE_STATIC_KEY_FALSE(tcp_tx_delay_enabled); |
2765 | EXPORT_SYMBOL(tcp_tx_delay_enabled); | |
2766 | ||
2767 | static void tcp_enable_tx_delay(void) | |
2768 | { | |
2769 | if (!static_branch_unlikely(&tcp_tx_delay_enabled)) { | |
2770 | static int __tcp_tx_delay_enabled = 0; | |
2771 | ||
2772 | if (cmpxchg(&__tcp_tx_delay_enabled, 0, 1) == 0) { | |
2773 | static_branch_enable(&tcp_tx_delay_enabled); | |
2774 | pr_info("TCP_TX_DELAY enabled\n"); | |
2775 | } | |
2776 | } | |
2777 | } | |
2778 | ||
1da177e4 LT |
2779 | /* |
2780 | * Socket option code for TCP. | |
2781 | */ | |
3fdadf7d | 2782 | static int do_tcp_setsockopt(struct sock *sk, int level, |
b7058842 | 2783 | int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
2784 | { |
2785 | struct tcp_sock *tp = tcp_sk(sk); | |
463c84b9 | 2786 | struct inet_connection_sock *icsk = inet_csk(sk); |
1e579caa | 2787 | struct net *net = sock_net(sk); |
1da177e4 LT |
2788 | int val; |
2789 | int err = 0; | |
2790 | ||
e56fb50f WAS |
2791 | /* These are data/string values, all the others are ints */ |
2792 | switch (optname) { | |
2793 | case TCP_CONGESTION: { | |
5f8ef48d SH |
2794 | char name[TCP_CA_NAME_MAX]; |
2795 | ||
2796 | if (optlen < 1) | |
2797 | return -EINVAL; | |
2798 | ||
2799 | val = strncpy_from_user(name, optval, | |
4fdb78d3 | 2800 | min_t(long, TCP_CA_NAME_MAX-1, optlen)); |
5f8ef48d SH |
2801 | if (val < 0) |
2802 | return -EFAULT; | |
2803 | name[val] = 0; | |
2804 | ||
2805 | lock_sock(sk); | |
8d650cde ED |
2806 | err = tcp_set_congestion_control(sk, name, true, true, |
2807 | ns_capable(sock_net(sk)->user_ns, | |
2808 | CAP_NET_ADMIN)); | |
5f8ef48d SH |
2809 | release_sock(sk); |
2810 | return err; | |
2811 | } | |
734942cc DW |
2812 | case TCP_ULP: { |
2813 | char name[TCP_ULP_NAME_MAX]; | |
2814 | ||
2815 | if (optlen < 1) | |
2816 | return -EINVAL; | |
2817 | ||
2818 | val = strncpy_from_user(name, optval, | |
2819 | min_t(long, TCP_ULP_NAME_MAX - 1, | |
2820 | optlen)); | |
2821 | if (val < 0) | |
2822 | return -EFAULT; | |
2823 | name[val] = 0; | |
2824 | ||
2825 | lock_sock(sk); | |
2826 | err = tcp_set_ulp(sk, name); | |
2827 | release_sock(sk); | |
2828 | return err; | |
2829 | } | |
1fba70e5 | 2830 | case TCP_FASTOPEN_KEY: { |
0f1ce023 JB |
2831 | __u8 key[TCP_FASTOPEN_KEY_BUF_LENGTH]; |
2832 | __u8 *backup_key = NULL; | |
1fba70e5 | 2833 | |
0f1ce023 JB |
2834 | /* Allow a backup key as well to facilitate key rotation |
2835 | * First key is the active one. | |
2836 | */ | |
2837 | if (optlen != TCP_FASTOPEN_KEY_LENGTH && | |
2838 | optlen != TCP_FASTOPEN_KEY_BUF_LENGTH) | |
1fba70e5 YC |
2839 | return -EINVAL; |
2840 | ||
2841 | if (copy_from_user(key, optval, optlen)) | |
2842 | return -EFAULT; | |
2843 | ||
0f1ce023 JB |
2844 | if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH) |
2845 | backup_key = key + TCP_FASTOPEN_KEY_LENGTH; | |
2846 | ||
438ac880 | 2847 | return tcp_fastopen_reset_cipher(net, sk, key, backup_key); |
1fba70e5 | 2848 | } |
e56fb50f WAS |
2849 | default: |
2850 | /* fallthru */ | |
2851 | break; | |
ccbd6a5a | 2852 | } |
5f8ef48d | 2853 | |
1da177e4 LT |
2854 | if (optlen < sizeof(int)) |
2855 | return -EINVAL; | |
2856 | ||
2857 | if (get_user(val, (int __user *)optval)) | |
2858 | return -EFAULT; | |
2859 | ||
2860 | lock_sock(sk); | |
2861 | ||
2862 | switch (optname) { | |
2863 | case TCP_MAXSEG: | |
2864 | /* Values greater than interface MTU won't take effect. However | |
2865 | * at the point when this call is done we typically don't yet | |
a777f715 RC |
2866 | * know which interface is going to be used |
2867 | */ | |
cfc62d87 | 2868 | if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) { |
1da177e4 LT |
2869 | err = -EINVAL; |
2870 | break; | |
2871 | } | |
2872 | tp->rx_opt.user_mss = val; | |
2873 | break; | |
2874 | ||
2875 | case TCP_NODELAY: | |
2876 | if (val) { | |
2877 | /* TCP_NODELAY is weaker than TCP_CORK, so that | |
2878 | * this option on corked socket is remembered, but | |
2879 | * it is not activated until cork is cleared. | |
2880 | * | |
2881 | * However, when TCP_NODELAY is set we make | |
2882 | * an explicit push, which overrides even TCP_CORK | |
2883 | * for currently queued segments. | |
2884 | */ | |
2885 | tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; | |
9e412ba7 | 2886 | tcp_push_pending_frames(sk); |
1da177e4 LT |
2887 | } else { |
2888 | tp->nonagle &= ~TCP_NAGLE_OFF; | |
2889 | } | |
2890 | break; | |
2891 | ||
36e31b0a AP |
2892 | case TCP_THIN_LINEAR_TIMEOUTS: |
2893 | if (val < 0 || val > 1) | |
2894 | err = -EINVAL; | |
2895 | else | |
2896 | tp->thin_lto = val; | |
2897 | break; | |
2898 | ||
7e380175 AP |
2899 | case TCP_THIN_DUPACK: |
2900 | if (val < 0 || val > 1) | |
2901 | err = -EINVAL; | |
7e380175 AP |
2902 | break; |
2903 | ||
ee995283 PE |
2904 | case TCP_REPAIR: |
2905 | if (!tcp_can_repair_sock(sk)) | |
2906 | err = -EPERM; | |
31048d7a | 2907 | else if (val == TCP_REPAIR_ON) { |
ee995283 PE |
2908 | tp->repair = 1; |
2909 | sk->sk_reuse = SK_FORCE_REUSE; | |
2910 | tp->repair_queue = TCP_NO_QUEUE; | |
31048d7a | 2911 | } else if (val == TCP_REPAIR_OFF) { |
ee995283 PE |
2912 | tp->repair = 0; |
2913 | sk->sk_reuse = SK_NO_REUSE; | |
2914 | tcp_send_window_probe(sk); | |
31048d7a | 2915 | } else if (val == TCP_REPAIR_OFF_NO_WP) { |
ee995283 PE |
2916 | tp->repair = 0; |
2917 | sk->sk_reuse = SK_NO_REUSE; | |
ee995283 PE |
2918 | } else |
2919 | err = -EINVAL; | |
2920 | ||
2921 | break; | |
2922 | ||
2923 | case TCP_REPAIR_QUEUE: | |
2924 | if (!tp->repair) | |
2925 | err = -EPERM; | |
bf2acc94 | 2926 | else if ((unsigned int)val < TCP_QUEUES_NR) |
ee995283 PE |
2927 | tp->repair_queue = val; |
2928 | else | |
2929 | err = -EINVAL; | |
2930 | break; | |
2931 | ||
2932 | case TCP_QUEUE_SEQ: | |
2933 | if (sk->sk_state != TCP_CLOSE) | |
2934 | err = -EPERM; | |
2935 | else if (tp->repair_queue == TCP_SEND_QUEUE) | |
2936 | tp->write_seq = val; | |
2937 | else if (tp->repair_queue == TCP_RECV_QUEUE) | |
2938 | tp->rcv_nxt = val; | |
2939 | else | |
2940 | err = -EINVAL; | |
2941 | break; | |
2942 | ||
b139ba4e PE |
2943 | case TCP_REPAIR_OPTIONS: |
2944 | if (!tp->repair) | |
2945 | err = -EINVAL; | |
2946 | else if (sk->sk_state == TCP_ESTABLISHED) | |
15e56515 | 2947 | err = tcp_repair_options_est(sk, |
de248a75 PE |
2948 | (struct tcp_repair_opt __user *)optval, |
2949 | optlen); | |
b139ba4e PE |
2950 | else |
2951 | err = -EPERM; | |
2952 | break; | |
2953 | ||
1da177e4 LT |
2954 | case TCP_CORK: |
2955 | /* When set indicates to always queue non-full frames. | |
2956 | * Later the user clears this option and we transmit | |
2957 | * any pending partial frames in the queue. This is | |
2958 | * meant to be used alongside sendfile() to get properly | |
2959 | * filled frames when the user (for example) must write | |
2960 | * out headers with a write() call first and then use | |
2961 | * sendfile to send out the data parts. | |
2962 | * | |
2963 | * TCP_CORK can be set together with TCP_NODELAY and it is | |
2964 | * stronger than TCP_NODELAY. | |
2965 | */ | |
2966 | if (val) { | |
2967 | tp->nonagle |= TCP_NAGLE_CORK; | |
2968 | } else { | |
2969 | tp->nonagle &= ~TCP_NAGLE_CORK; | |
2970 | if (tp->nonagle&TCP_NAGLE_OFF) | |
2971 | tp->nonagle |= TCP_NAGLE_PUSH; | |
9e412ba7 | 2972 | tcp_push_pending_frames(sk); |
1da177e4 LT |
2973 | } |
2974 | break; | |
2975 | ||
2976 | case TCP_KEEPIDLE: | |
2977 | if (val < 1 || val > MAX_TCP_KEEPIDLE) | |
2978 | err = -EINVAL; | |
2979 | else { | |
2980 | tp->keepalive_time = val * HZ; | |
2981 | if (sock_flag(sk, SOCK_KEEPOPEN) && | |
2982 | !((1 << sk->sk_state) & | |
2983 | (TCPF_CLOSE | TCPF_LISTEN))) { | |
6c37e5de | 2984 | u32 elapsed = keepalive_time_elapsed(tp); |
1da177e4 LT |
2985 | if (tp->keepalive_time > elapsed) |
2986 | elapsed = tp->keepalive_time - elapsed; | |
2987 | else | |
2988 | elapsed = 0; | |
463c84b9 | 2989 | inet_csk_reset_keepalive_timer(sk, elapsed); |
1da177e4 LT |
2990 | } |
2991 | } | |
2992 | break; | |
2993 | case TCP_KEEPINTVL: | |
2994 | if (val < 1 || val > MAX_TCP_KEEPINTVL) | |
2995 | err = -EINVAL; | |
2996 | else | |
2997 | tp->keepalive_intvl = val * HZ; | |
2998 | break; | |
2999 | case TCP_KEEPCNT: | |
3000 | if (val < 1 || val > MAX_TCP_KEEPCNT) | |
3001 | err = -EINVAL; | |
3002 | else | |
3003 | tp->keepalive_probes = val; | |
3004 | break; | |
3005 | case TCP_SYNCNT: | |
3006 | if (val < 1 || val > MAX_TCP_SYNCNT) | |
3007 | err = -EINVAL; | |
3008 | else | |
463c84b9 | 3009 | icsk->icsk_syn_retries = val; |
1da177e4 LT |
3010 | break; |
3011 | ||
cd8ae852 ED |
3012 | case TCP_SAVE_SYN: |
3013 | if (val < 0 || val > 1) | |
3014 | err = -EINVAL; | |
3015 | else | |
3016 | tp->save_syn = val; | |
3017 | break; | |
3018 | ||
1da177e4 LT |
3019 | case TCP_LINGER2: |
3020 | if (val < 0) | |
3021 | tp->linger2 = -1; | |
1e579caa | 3022 | else if (val > net->ipv4.sysctl_tcp_fin_timeout / HZ) |
1da177e4 LT |
3023 | tp->linger2 = 0; |
3024 | else | |
3025 | tp->linger2 = val * HZ; | |
3026 | break; | |
3027 | ||
3028 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
3029 | /* Translate value in seconds to number of retransmits */ |
3030 | icsk->icsk_accept_queue.rskq_defer_accept = | |
3031 | secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ, | |
3032 | TCP_RTO_MAX / HZ); | |
1da177e4 LT |
3033 | break; |
3034 | ||
3035 | case TCP_WINDOW_CLAMP: | |
3036 | if (!val) { | |
3037 | if (sk->sk_state != TCP_CLOSE) { | |
3038 | err = -EINVAL; | |
3039 | break; | |
3040 | } | |
3041 | tp->window_clamp = 0; | |
3042 | } else | |
3043 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? | |
3044 | SOCK_MIN_RCVBUF / 2 : val; | |
3045 | break; | |
3046 | ||
3047 | case TCP_QUICKACK: | |
3048 | if (!val) { | |
31954cd8 | 3049 | inet_csk_enter_pingpong_mode(sk); |
1da177e4 | 3050 | } else { |
31954cd8 | 3051 | inet_csk_exit_pingpong_mode(sk); |
1da177e4 LT |
3052 | if ((1 << sk->sk_state) & |
3053 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && | |
463c84b9 ACM |
3054 | inet_csk_ack_scheduled(sk)) { |
3055 | icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; | |
0e4b4992 | 3056 | tcp_cleanup_rbuf(sk, 1); |
1da177e4 | 3057 | if (!(val & 1)) |
31954cd8 | 3058 | inet_csk_enter_pingpong_mode(sk); |
1da177e4 LT |
3059 | } |
3060 | } | |
3061 | break; | |
3062 | ||
cfb6eeb4 YH |
3063 | #ifdef CONFIG_TCP_MD5SIG |
3064 | case TCP_MD5SIG: | |
8917a777 | 3065 | case TCP_MD5SIG_EXT: |
72123032 ED |
3066 | if ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN)) |
3067 | err = tp->af_specific->md5_parse(sk, optname, optval, optlen); | |
3068 | else | |
3069 | err = -EINVAL; | |
cfb6eeb4 YH |
3070 | break; |
3071 | #endif | |
dca43c75 | 3072 | case TCP_USER_TIMEOUT: |
b248230c | 3073 | /* Cap the max time in ms TCP will retry or probe the window |
dca43c75 JC |
3074 | * before giving up and aborting (ETIMEDOUT) a connection. |
3075 | */ | |
42493570 HL |
3076 | if (val < 0) |
3077 | err = -EINVAL; | |
3078 | else | |
9bcc66e1 | 3079 | icsk->icsk_user_timeout = val; |
dca43c75 | 3080 | break; |
8336886f JC |
3081 | |
3082 | case TCP_FASTOPEN: | |
3083 | if (val >= 0 && ((1 << sk->sk_state) & (TCPF_CLOSE | | |
dfea2aa6 | 3084 | TCPF_LISTEN))) { |
43713848 | 3085 | tcp_fastopen_init_key_once(net); |
dfea2aa6 | 3086 | |
0536fcc0 | 3087 | fastopen_queue_tune(sk, val); |
dfea2aa6 | 3088 | } else { |
8336886f | 3089 | err = -EINVAL; |
dfea2aa6 | 3090 | } |
8336886f | 3091 | break; |
19f6d3f3 WW |
3092 | case TCP_FASTOPEN_CONNECT: |
3093 | if (val > 1 || val < 0) { | |
3094 | err = -EINVAL; | |
e1cfcbe8 | 3095 | } else if (net->ipv4.sysctl_tcp_fastopen & TFO_CLIENT_ENABLE) { |
19f6d3f3 WW |
3096 | if (sk->sk_state == TCP_CLOSE) |
3097 | tp->fastopen_connect = val; | |
3098 | else | |
3099 | err = -EINVAL; | |
3100 | } else { | |
3101 | err = -EOPNOTSUPP; | |
3102 | } | |
3103 | break; | |
71c02379 CP |
3104 | case TCP_FASTOPEN_NO_COOKIE: |
3105 | if (val > 1 || val < 0) | |
3106 | err = -EINVAL; | |
3107 | else if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
3108 | err = -EINVAL; | |
3109 | else | |
3110 | tp->fastopen_no_cookie = val; | |
3111 | break; | |
93be6ce0 AV |
3112 | case TCP_TIMESTAMP: |
3113 | if (!tp->repair) | |
3114 | err = -EPERM; | |
3115 | else | |
9a568de4 | 3116 | tp->tsoffset = val - tcp_time_stamp_raw(); |
93be6ce0 | 3117 | break; |
b1ed4c4f AV |
3118 | case TCP_REPAIR_WINDOW: |
3119 | err = tcp_repair_set_window(tp, optval, optlen); | |
3120 | break; | |
c9bee3b7 ED |
3121 | case TCP_NOTSENT_LOWAT: |
3122 | tp->notsent_lowat = val; | |
3123 | sk->sk_write_space(sk); | |
3124 | break; | |
b75eba76 SHY |
3125 | case TCP_INQ: |
3126 | if (val > 1 || val < 0) | |
3127 | err = -EINVAL; | |
3128 | else | |
3129 | tp->recvmsg_inq = val; | |
3130 | break; | |
a842fe14 ED |
3131 | case TCP_TX_DELAY: |
3132 | if (val) | |
3133 | tcp_enable_tx_delay(); | |
3134 | tp->tcp_tx_delay = val; | |
3135 | break; | |
1da177e4 LT |
3136 | default: |
3137 | err = -ENOPROTOOPT; | |
3138 | break; | |
3ff50b79 SH |
3139 | } |
3140 | ||
1da177e4 LT |
3141 | release_sock(sk); |
3142 | return err; | |
3143 | } | |
3144 | ||
3fdadf7d | 3145 | int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
b7058842 | 3146 | unsigned int optlen) |
3fdadf7d | 3147 | { |
cf533ea5 | 3148 | const struct inet_connection_sock *icsk = inet_csk(sk); |
3fdadf7d DM |
3149 | |
3150 | if (level != SOL_TCP) | |
3151 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, | |
3152 | optval, optlen); | |
3153 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); | |
3154 | } | |
4bc2f18b | 3155 | EXPORT_SYMBOL(tcp_setsockopt); |
3fdadf7d DM |
3156 | |
3157 | #ifdef CONFIG_COMPAT | |
543d9cfe | 3158 | int compat_tcp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 3159 | char __user *optval, unsigned int optlen) |
3fdadf7d | 3160 | { |
dec73ff0 ACM |
3161 | if (level != SOL_TCP) |
3162 | return inet_csk_compat_setsockopt(sk, level, optname, | |
3163 | optval, optlen); | |
3fdadf7d DM |
3164 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
3165 | } | |
543d9cfe | 3166 | EXPORT_SYMBOL(compat_tcp_setsockopt); |
3fdadf7d DM |
3167 | #endif |
3168 | ||
efd90174 FY |
3169 | static void tcp_get_info_chrono_stats(const struct tcp_sock *tp, |
3170 | struct tcp_info *info) | |
3171 | { | |
3172 | u64 stats[__TCP_CHRONO_MAX], total = 0; | |
3173 | enum tcp_chrono i; | |
3174 | ||
3175 | for (i = TCP_CHRONO_BUSY; i < __TCP_CHRONO_MAX; ++i) { | |
3176 | stats[i] = tp->chrono_stat[i - 1]; | |
3177 | if (i == tp->chrono_type) | |
628174cc | 3178 | stats[i] += tcp_jiffies32 - tp->chrono_start; |
efd90174 FY |
3179 | stats[i] *= USEC_PER_SEC / HZ; |
3180 | total += stats[i]; | |
3181 | } | |
3182 | ||
3183 | info->tcpi_busy_time = total; | |
3184 | info->tcpi_rwnd_limited = stats[TCP_CHRONO_RWND_LIMITED]; | |
3185 | info->tcpi_sndbuf_limited = stats[TCP_CHRONO_SNDBUF_LIMITED]; | |
3186 | } | |
3187 | ||
1da177e4 | 3188 | /* Return information about state of tcp endpoint in API format. */ |
0df48c26 | 3189 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
1da177e4 | 3190 | { |
35ac838a | 3191 | const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */ |
463c84b9 | 3192 | const struct inet_connection_sock *icsk = inet_csk(sk); |
76a9ebe8 | 3193 | unsigned long rate; |
0263598c | 3194 | u32 now; |
ff5d7497 | 3195 | u64 rate64; |
67db3e4b | 3196 | bool slow; |
1da177e4 LT |
3197 | |
3198 | memset(info, 0, sizeof(*info)); | |
35ac838a CG |
3199 | if (sk->sk_type != SOCK_STREAM) |
3200 | return; | |
1da177e4 | 3201 | |
986ffdfd | 3202 | info->tcpi_state = inet_sk_state_load(sk); |
00fd38d9 | 3203 | |
ccbf3bfa ED |
3204 | /* Report meaningful fields for all TCP states, including listeners */ |
3205 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 3206 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3207 | info->tcpi_pacing_rate = rate64; |
ccbf3bfa ED |
3208 | |
3209 | rate = READ_ONCE(sk->sk_max_pacing_rate); | |
76a9ebe8 | 3210 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3211 | info->tcpi_max_pacing_rate = rate64; |
ccbf3bfa ED |
3212 | |
3213 | info->tcpi_reordering = tp->reordering; | |
3214 | info->tcpi_snd_cwnd = tp->snd_cwnd; | |
3215 | ||
3216 | if (info->tcpi_state == TCP_LISTEN) { | |
3217 | /* listeners aliased fields : | |
3218 | * tcpi_unacked -> Number of children ready for accept() | |
3219 | * tcpi_sacked -> max backlog | |
3220 | */ | |
3221 | info->tcpi_unacked = sk->sk_ack_backlog; | |
3222 | info->tcpi_sacked = sk->sk_max_ack_backlog; | |
3223 | return; | |
3224 | } | |
b369e7fd ED |
3225 | |
3226 | slow = lock_sock_fast(sk); | |
3227 | ||
6687e988 | 3228 | info->tcpi_ca_state = icsk->icsk_ca_state; |
463c84b9 | 3229 | info->tcpi_retransmits = icsk->icsk_retransmits; |
6687e988 | 3230 | info->tcpi_probes = icsk->icsk_probes_out; |
463c84b9 | 3231 | info->tcpi_backoff = icsk->icsk_backoff; |
1da177e4 LT |
3232 | |
3233 | if (tp->rx_opt.tstamp_ok) | |
3234 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
e60402d0 | 3235 | if (tcp_is_sack(tp)) |
1da177e4 LT |
3236 | info->tcpi_options |= TCPI_OPT_SACK; |
3237 | if (tp->rx_opt.wscale_ok) { | |
3238 | info->tcpi_options |= TCPI_OPT_WSCALE; | |
3239 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; | |
3240 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; | |
e905a9ed | 3241 | } |
1da177e4 | 3242 | |
b5c5693b | 3243 | if (tp->ecn_flags & TCP_ECN_OK) |
1da177e4 | 3244 | info->tcpi_options |= TCPI_OPT_ECN; |
b5c5693b ED |
3245 | if (tp->ecn_flags & TCP_ECN_SEEN) |
3246 | info->tcpi_options |= TCPI_OPT_ECN_SEEN; | |
6f73601e YC |
3247 | if (tp->syn_data_acked) |
3248 | info->tcpi_options |= TCPI_OPT_SYN_DATA; | |
1da177e4 | 3249 | |
463c84b9 ACM |
3250 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
3251 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); | |
c1b4a7e6 | 3252 | info->tcpi_snd_mss = tp->mss_cache; |
463c84b9 | 3253 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
1da177e4 | 3254 | |
ccbf3bfa ED |
3255 | info->tcpi_unacked = tp->packets_out; |
3256 | info->tcpi_sacked = tp->sacked_out; | |
3257 | ||
1da177e4 LT |
3258 | info->tcpi_lost = tp->lost_out; |
3259 | info->tcpi_retrans = tp->retrans_out; | |
1da177e4 | 3260 | |
d635fbe2 | 3261 | now = tcp_jiffies32; |
1da177e4 | 3262 | info->tcpi_last_data_sent = jiffies_to_msecs(now - tp->lsndtime); |
463c84b9 | 3263 | info->tcpi_last_data_recv = jiffies_to_msecs(now - icsk->icsk_ack.lrcvtime); |
1da177e4 LT |
3264 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
3265 | ||
d83d8461 | 3266 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
1da177e4 | 3267 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
740b0f18 ED |
3268 | info->tcpi_rtt = tp->srtt_us >> 3; |
3269 | info->tcpi_rttvar = tp->mdev_us >> 2; | |
1da177e4 | 3270 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
1da177e4 | 3271 | info->tcpi_advmss = tp->advmss; |
1da177e4 | 3272 | |
645f4c6f | 3273 | info->tcpi_rcv_rtt = tp->rcv_rtt_est.rtt_us >> 3; |
1da177e4 LT |
3274 | info->tcpi_rcv_space = tp->rcvq_space.space; |
3275 | ||
3276 | info->tcpi_total_retrans = tp->total_retrans; | |
977cb0ec | 3277 | |
f522a5fc ED |
3278 | info->tcpi_bytes_acked = tp->bytes_acked; |
3279 | info->tcpi_bytes_received = tp->bytes_received; | |
67db3e4b | 3280 | info->tcpi_notsent_bytes = max_t(int, 0, tp->write_seq - tp->snd_nxt); |
efd90174 | 3281 | tcp_get_info_chrono_stats(tp, info); |
67db3e4b | 3282 | |
2efd055c MRL |
3283 | info->tcpi_segs_out = tp->segs_out; |
3284 | info->tcpi_segs_in = tp->segs_in; | |
cd9b2660 | 3285 | |
cd9b2660 | 3286 | info->tcpi_min_rtt = tcp_min_rtt(tp); |
a44d6eac MKL |
3287 | info->tcpi_data_segs_in = tp->data_segs_in; |
3288 | info->tcpi_data_segs_out = tp->data_segs_out; | |
eb8329e0 YC |
3289 | |
3290 | info->tcpi_delivery_rate_app_limited = tp->rate_app_limited ? 1 : 0; | |
0263598c WW |
3291 | rate64 = tcp_compute_delivery_rate(tp); |
3292 | if (rate64) | |
f522a5fc | 3293 | info->tcpi_delivery_rate = rate64; |
feb5f2ec YC |
3294 | info->tcpi_delivered = tp->delivered; |
3295 | info->tcpi_delivered_ce = tp->delivered_ce; | |
ba113c3a | 3296 | info->tcpi_bytes_sent = tp->bytes_sent; |
fb31c9b9 | 3297 | info->tcpi_bytes_retrans = tp->bytes_retrans; |
7e10b655 | 3298 | info->tcpi_dsack_dups = tp->dsack_dups; |
7ec65372 | 3299 | info->tcpi_reord_seen = tp->reord_seen; |
f9af2dbb | 3300 | info->tcpi_rcv_ooopack = tp->rcv_ooopack; |
8f7baad7 | 3301 | info->tcpi_snd_wnd = tp->snd_wnd; |
b369e7fd | 3302 | unlock_sock_fast(sk, slow); |
1da177e4 | 3303 | } |
1da177e4 LT |
3304 | EXPORT_SYMBOL_GPL(tcp_get_info); |
3305 | ||
984988aa WW |
3306 | static size_t tcp_opt_stats_get_size(void) |
3307 | { | |
3308 | return | |
3309 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BUSY */ | |
3310 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_RWND_LIMITED */ | |
3311 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_SNDBUF_LIMITED */ | |
3312 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DATA_SEGS_OUT */ | |
3313 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_TOTAL_RETRANS */ | |
3314 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_PACING_RATE */ | |
3315 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DELIVERY_RATE */ | |
3316 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_CWND */ | |
3317 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORDERING */ | |
3318 | nla_total_size(sizeof(u32)) + /* TCP_NLA_MIN_RTT */ | |
3319 | nla_total_size(sizeof(u8)) + /* TCP_NLA_RECUR_RETRANS */ | |
3320 | nla_total_size(sizeof(u8)) + /* TCP_NLA_DELIVERY_RATE_APP_LMT */ | |
3321 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SNDQ_SIZE */ | |
3322 | nla_total_size(sizeof(u8)) + /* TCP_NLA_CA_STATE */ | |
3323 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_SSTHRESH */ | |
3324 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED */ | |
3325 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED_CE */ | |
ba113c3a | 3326 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_SENT */ |
fb31c9b9 | 3327 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_RETRANS */ |
7e10b655 | 3328 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DSACK_DUPS */ |
7ec65372 | 3329 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */ |
e8bd8fca | 3330 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */ |
984988aa WW |
3331 | 0; |
3332 | } | |
3333 | ||
1c885808 FY |
3334 | struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk) |
3335 | { | |
3336 | const struct tcp_sock *tp = tcp_sk(sk); | |
3337 | struct sk_buff *stats; | |
3338 | struct tcp_info info; | |
76a9ebe8 | 3339 | unsigned long rate; |
bb7c19f9 | 3340 | u64 rate64; |
1c885808 | 3341 | |
984988aa | 3342 | stats = alloc_skb(tcp_opt_stats_get_size(), GFP_ATOMIC); |
1c885808 FY |
3343 | if (!stats) |
3344 | return NULL; | |
3345 | ||
3346 | tcp_get_info_chrono_stats(tp, &info); | |
3347 | nla_put_u64_64bit(stats, TCP_NLA_BUSY, | |
3348 | info.tcpi_busy_time, TCP_NLA_PAD); | |
3349 | nla_put_u64_64bit(stats, TCP_NLA_RWND_LIMITED, | |
3350 | info.tcpi_rwnd_limited, TCP_NLA_PAD); | |
3351 | nla_put_u64_64bit(stats, TCP_NLA_SNDBUF_LIMITED, | |
3352 | info.tcpi_sndbuf_limited, TCP_NLA_PAD); | |
7e98102f YC |
3353 | nla_put_u64_64bit(stats, TCP_NLA_DATA_SEGS_OUT, |
3354 | tp->data_segs_out, TCP_NLA_PAD); | |
3355 | nla_put_u64_64bit(stats, TCP_NLA_TOTAL_RETRANS, | |
3356 | tp->total_retrans, TCP_NLA_PAD); | |
bb7c19f9 WW |
3357 | |
3358 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 3359 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
bb7c19f9 WW |
3360 | nla_put_u64_64bit(stats, TCP_NLA_PACING_RATE, rate64, TCP_NLA_PAD); |
3361 | ||
3362 | rate64 = tcp_compute_delivery_rate(tp); | |
3363 | nla_put_u64_64bit(stats, TCP_NLA_DELIVERY_RATE, rate64, TCP_NLA_PAD); | |
3364 | ||
3365 | nla_put_u32(stats, TCP_NLA_SND_CWND, tp->snd_cwnd); | |
3366 | nla_put_u32(stats, TCP_NLA_REORDERING, tp->reordering); | |
3367 | nla_put_u32(stats, TCP_NLA_MIN_RTT, tcp_min_rtt(tp)); | |
3368 | ||
3369 | nla_put_u8(stats, TCP_NLA_RECUR_RETRANS, inet_csk(sk)->icsk_retransmits); | |
3370 | nla_put_u8(stats, TCP_NLA_DELIVERY_RATE_APP_LMT, !!tp->rate_app_limited); | |
7156d194 | 3371 | nla_put_u32(stats, TCP_NLA_SND_SSTHRESH, tp->snd_ssthresh); |
feb5f2ec YC |
3372 | nla_put_u32(stats, TCP_NLA_DELIVERED, tp->delivered); |
3373 | nla_put_u32(stats, TCP_NLA_DELIVERED_CE, tp->delivered_ce); | |
87ecc95d PJ |
3374 | |
3375 | nla_put_u32(stats, TCP_NLA_SNDQ_SIZE, tp->write_seq - tp->snd_una); | |
be631892 | 3376 | nla_put_u8(stats, TCP_NLA_CA_STATE, inet_csk(sk)->icsk_ca_state); |
feb5f2ec | 3377 | |
ba113c3a WW |
3378 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_SENT, tp->bytes_sent, |
3379 | TCP_NLA_PAD); | |
fb31c9b9 WW |
3380 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_RETRANS, tp->bytes_retrans, |
3381 | TCP_NLA_PAD); | |
7e10b655 | 3382 | nla_put_u32(stats, TCP_NLA_DSACK_DUPS, tp->dsack_dups); |
7ec65372 | 3383 | nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen); |
e8bd8fca | 3384 | nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3); |
ba113c3a | 3385 | |
1c885808 FY |
3386 | return stats; |
3387 | } | |
3388 | ||
3fdadf7d DM |
3389 | static int do_tcp_getsockopt(struct sock *sk, int level, |
3390 | int optname, char __user *optval, int __user *optlen) | |
1da177e4 | 3391 | { |
295f7324 | 3392 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 3393 | struct tcp_sock *tp = tcp_sk(sk); |
6fa25166 | 3394 | struct net *net = sock_net(sk); |
1da177e4 LT |
3395 | int val, len; |
3396 | ||
1da177e4 LT |
3397 | if (get_user(len, optlen)) |
3398 | return -EFAULT; | |
3399 | ||
3400 | len = min_t(unsigned int, len, sizeof(int)); | |
3401 | ||
3402 | if (len < 0) | |
3403 | return -EINVAL; | |
3404 | ||
3405 | switch (optname) { | |
3406 | case TCP_MAXSEG: | |
c1b4a7e6 | 3407 | val = tp->mss_cache; |
1da177e4 LT |
3408 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
3409 | val = tp->rx_opt.user_mss; | |
5e6a3ce6 PE |
3410 | if (tp->repair) |
3411 | val = tp->rx_opt.mss_clamp; | |
1da177e4 LT |
3412 | break; |
3413 | case TCP_NODELAY: | |
3414 | val = !!(tp->nonagle&TCP_NAGLE_OFF); | |
3415 | break; | |
3416 | case TCP_CORK: | |
3417 | val = !!(tp->nonagle&TCP_NAGLE_CORK); | |
3418 | break; | |
3419 | case TCP_KEEPIDLE: | |
df19a626 | 3420 | val = keepalive_time_when(tp) / HZ; |
1da177e4 LT |
3421 | break; |
3422 | case TCP_KEEPINTVL: | |
df19a626 | 3423 | val = keepalive_intvl_when(tp) / HZ; |
1da177e4 LT |
3424 | break; |
3425 | case TCP_KEEPCNT: | |
df19a626 | 3426 | val = keepalive_probes(tp); |
1da177e4 LT |
3427 | break; |
3428 | case TCP_SYNCNT: | |
6fa25166 | 3429 | val = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries; |
1da177e4 LT |
3430 | break; |
3431 | case TCP_LINGER2: | |
3432 | val = tp->linger2; | |
3433 | if (val >= 0) | |
1e579caa | 3434 | val = (val ? : net->ipv4.sysctl_tcp_fin_timeout) / HZ; |
1da177e4 LT |
3435 | break; |
3436 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
3437 | val = retrans_to_secs(icsk->icsk_accept_queue.rskq_defer_accept, |
3438 | TCP_TIMEOUT_INIT / HZ, TCP_RTO_MAX / HZ); | |
1da177e4 LT |
3439 | break; |
3440 | case TCP_WINDOW_CLAMP: | |
3441 | val = tp->window_clamp; | |
3442 | break; | |
3443 | case TCP_INFO: { | |
3444 | struct tcp_info info; | |
3445 | ||
3446 | if (get_user(len, optlen)) | |
3447 | return -EFAULT; | |
3448 | ||
3449 | tcp_get_info(sk, &info); | |
3450 | ||
3451 | len = min_t(unsigned int, len, sizeof(info)); | |
3452 | if (put_user(len, optlen)) | |
3453 | return -EFAULT; | |
3454 | if (copy_to_user(optval, &info, len)) | |
3455 | return -EFAULT; | |
3456 | return 0; | |
3457 | } | |
6e9250f5 ED |
3458 | case TCP_CC_INFO: { |
3459 | const struct tcp_congestion_ops *ca_ops; | |
3460 | union tcp_cc_info info; | |
3461 | size_t sz = 0; | |
3462 | int attr; | |
3463 | ||
3464 | if (get_user(len, optlen)) | |
3465 | return -EFAULT; | |
3466 | ||
3467 | ca_ops = icsk->icsk_ca_ops; | |
3468 | if (ca_ops && ca_ops->get_info) | |
3469 | sz = ca_ops->get_info(sk, ~0U, &attr, &info); | |
3470 | ||
3471 | len = min_t(unsigned int, len, sz); | |
3472 | if (put_user(len, optlen)) | |
3473 | return -EFAULT; | |
3474 | if (copy_to_user(optval, &info, len)) | |
3475 | return -EFAULT; | |
3476 | return 0; | |
3477 | } | |
1da177e4 | 3478 | case TCP_QUICKACK: |
31954cd8 | 3479 | val = !inet_csk_in_pingpong_mode(sk); |
1da177e4 | 3480 | break; |
5f8ef48d SH |
3481 | |
3482 | case TCP_CONGESTION: | |
3483 | if (get_user(len, optlen)) | |
3484 | return -EFAULT; | |
3485 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); | |
3486 | if (put_user(len, optlen)) | |
3487 | return -EFAULT; | |
6687e988 | 3488 | if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) |
5f8ef48d SH |
3489 | return -EFAULT; |
3490 | return 0; | |
e56fb50f | 3491 | |
734942cc DW |
3492 | case TCP_ULP: |
3493 | if (get_user(len, optlen)) | |
3494 | return -EFAULT; | |
3495 | len = min_t(unsigned int, len, TCP_ULP_NAME_MAX); | |
d97af30f DW |
3496 | if (!icsk->icsk_ulp_ops) { |
3497 | if (put_user(0, optlen)) | |
3498 | return -EFAULT; | |
3499 | return 0; | |
3500 | } | |
734942cc DW |
3501 | if (put_user(len, optlen)) |
3502 | return -EFAULT; | |
3503 | if (copy_to_user(optval, icsk->icsk_ulp_ops->name, len)) | |
3504 | return -EFAULT; | |
3505 | return 0; | |
3506 | ||
1fba70e5 | 3507 | case TCP_FASTOPEN_KEY: { |
0f1ce023 | 3508 | __u8 key[TCP_FASTOPEN_KEY_BUF_LENGTH]; |
1fba70e5 | 3509 | struct tcp_fastopen_context *ctx; |
0f1ce023 | 3510 | unsigned int key_len = 0; |
1fba70e5 YC |
3511 | |
3512 | if (get_user(len, optlen)) | |
3513 | return -EFAULT; | |
3514 | ||
3515 | rcu_read_lock(); | |
3516 | ctx = rcu_dereference(icsk->icsk_accept_queue.fastopenq.ctx); | |
0f1ce023 JB |
3517 | if (ctx) { |
3518 | key_len = tcp_fastopen_context_len(ctx) * | |
3519 | TCP_FASTOPEN_KEY_LENGTH; | |
3520 | memcpy(&key[0], &ctx->key[0], key_len); | |
3521 | } | |
1fba70e5 YC |
3522 | rcu_read_unlock(); |
3523 | ||
0f1ce023 | 3524 | len = min_t(unsigned int, len, key_len); |
1fba70e5 YC |
3525 | if (put_user(len, optlen)) |
3526 | return -EFAULT; | |
3527 | if (copy_to_user(optval, key, len)) | |
3528 | return -EFAULT; | |
3529 | return 0; | |
3530 | } | |
3c0fef0b JH |
3531 | case TCP_THIN_LINEAR_TIMEOUTS: |
3532 | val = tp->thin_lto; | |
3533 | break; | |
4a7f6009 | 3534 | |
3c0fef0b | 3535 | case TCP_THIN_DUPACK: |
4a7f6009 | 3536 | val = 0; |
3c0fef0b | 3537 | break; |
dca43c75 | 3538 | |
ee995283 PE |
3539 | case TCP_REPAIR: |
3540 | val = tp->repair; | |
3541 | break; | |
3542 | ||
3543 | case TCP_REPAIR_QUEUE: | |
3544 | if (tp->repair) | |
3545 | val = tp->repair_queue; | |
3546 | else | |
3547 | return -EINVAL; | |
3548 | break; | |
3549 | ||
b1ed4c4f AV |
3550 | case TCP_REPAIR_WINDOW: { |
3551 | struct tcp_repair_window opt; | |
3552 | ||
3553 | if (get_user(len, optlen)) | |
3554 | return -EFAULT; | |
3555 | ||
3556 | if (len != sizeof(opt)) | |
3557 | return -EINVAL; | |
3558 | ||
3559 | if (!tp->repair) | |
3560 | return -EPERM; | |
3561 | ||
3562 | opt.snd_wl1 = tp->snd_wl1; | |
3563 | opt.snd_wnd = tp->snd_wnd; | |
3564 | opt.max_window = tp->max_window; | |
3565 | opt.rcv_wnd = tp->rcv_wnd; | |
3566 | opt.rcv_wup = tp->rcv_wup; | |
3567 | ||
3568 | if (copy_to_user(optval, &opt, len)) | |
3569 | return -EFAULT; | |
3570 | return 0; | |
3571 | } | |
ee995283 PE |
3572 | case TCP_QUEUE_SEQ: |
3573 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
3574 | val = tp->write_seq; | |
3575 | else if (tp->repair_queue == TCP_RECV_QUEUE) | |
3576 | val = tp->rcv_nxt; | |
3577 | else | |
3578 | return -EINVAL; | |
3579 | break; | |
3580 | ||
dca43c75 | 3581 | case TCP_USER_TIMEOUT: |
9bcc66e1 | 3582 | val = icsk->icsk_user_timeout; |
dca43c75 | 3583 | break; |
1536e285 KN |
3584 | |
3585 | case TCP_FASTOPEN: | |
0536fcc0 | 3586 | val = icsk->icsk_accept_queue.fastopenq.max_qlen; |
1536e285 KN |
3587 | break; |
3588 | ||
19f6d3f3 WW |
3589 | case TCP_FASTOPEN_CONNECT: |
3590 | val = tp->fastopen_connect; | |
3591 | break; | |
3592 | ||
71c02379 CP |
3593 | case TCP_FASTOPEN_NO_COOKIE: |
3594 | val = tp->fastopen_no_cookie; | |
3595 | break; | |
3596 | ||
a842fe14 ED |
3597 | case TCP_TX_DELAY: |
3598 | val = tp->tcp_tx_delay; | |
3599 | break; | |
3600 | ||
93be6ce0 | 3601 | case TCP_TIMESTAMP: |
9a568de4 | 3602 | val = tcp_time_stamp_raw() + tp->tsoffset; |
93be6ce0 | 3603 | break; |
c9bee3b7 ED |
3604 | case TCP_NOTSENT_LOWAT: |
3605 | val = tp->notsent_lowat; | |
3606 | break; | |
b75eba76 SHY |
3607 | case TCP_INQ: |
3608 | val = tp->recvmsg_inq; | |
3609 | break; | |
cd8ae852 ED |
3610 | case TCP_SAVE_SYN: |
3611 | val = tp->save_syn; | |
3612 | break; | |
3613 | case TCP_SAVED_SYN: { | |
3614 | if (get_user(len, optlen)) | |
3615 | return -EFAULT; | |
3616 | ||
3617 | lock_sock(sk); | |
3618 | if (tp->saved_syn) { | |
aea0929e EM |
3619 | if (len < tp->saved_syn[0]) { |
3620 | if (put_user(tp->saved_syn[0], optlen)) { | |
3621 | release_sock(sk); | |
3622 | return -EFAULT; | |
3623 | } | |
3624 | release_sock(sk); | |
3625 | return -EINVAL; | |
3626 | } | |
3627 | len = tp->saved_syn[0]; | |
cd8ae852 ED |
3628 | if (put_user(len, optlen)) { |
3629 | release_sock(sk); | |
3630 | return -EFAULT; | |
3631 | } | |
3632 | if (copy_to_user(optval, tp->saved_syn + 1, len)) { | |
3633 | release_sock(sk); | |
3634 | return -EFAULT; | |
3635 | } | |
3636 | tcp_saved_syn_free(tp); | |
3637 | release_sock(sk); | |
3638 | } else { | |
3639 | release_sock(sk); | |
3640 | len = 0; | |
3641 | if (put_user(len, optlen)) | |
3642 | return -EFAULT; | |
3643 | } | |
3644 | return 0; | |
3645 | } | |
05255b82 ED |
3646 | #ifdef CONFIG_MMU |
3647 | case TCP_ZEROCOPY_RECEIVE: { | |
3648 | struct tcp_zerocopy_receive zc; | |
3649 | int err; | |
3650 | ||
3651 | if (get_user(len, optlen)) | |
3652 | return -EFAULT; | |
3653 | if (len != sizeof(zc)) | |
3654 | return -EINVAL; | |
3655 | if (copy_from_user(&zc, optval, len)) | |
3656 | return -EFAULT; | |
3657 | lock_sock(sk); | |
3658 | err = tcp_zerocopy_receive(sk, &zc); | |
3659 | release_sock(sk); | |
3660 | if (!err && copy_to_user(optval, &zc, len)) | |
3661 | err = -EFAULT; | |
3662 | return err; | |
3663 | } | |
3664 | #endif | |
1da177e4 LT |
3665 | default: |
3666 | return -ENOPROTOOPT; | |
3ff50b79 | 3667 | } |
1da177e4 LT |
3668 | |
3669 | if (put_user(len, optlen)) | |
3670 | return -EFAULT; | |
3671 | if (copy_to_user(optval, &val, len)) | |
3672 | return -EFAULT; | |
3673 | return 0; | |
3674 | } | |
3675 | ||
3fdadf7d DM |
3676 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
3677 | int __user *optlen) | |
3678 | { | |
3679 | struct inet_connection_sock *icsk = inet_csk(sk); | |
3680 | ||
3681 | if (level != SOL_TCP) | |
3682 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, | |
3683 | optval, optlen); | |
3684 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); | |
3685 | } | |
4bc2f18b | 3686 | EXPORT_SYMBOL(tcp_getsockopt); |
3fdadf7d DM |
3687 | |
3688 | #ifdef CONFIG_COMPAT | |
543d9cfe ACM |
3689 | int compat_tcp_getsockopt(struct sock *sk, int level, int optname, |
3690 | char __user *optval, int __user *optlen) | |
3fdadf7d | 3691 | { |
dec73ff0 ACM |
3692 | if (level != SOL_TCP) |
3693 | return inet_csk_compat_getsockopt(sk, level, optname, | |
3694 | optval, optlen); | |
3fdadf7d DM |
3695 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
3696 | } | |
543d9cfe | 3697 | EXPORT_SYMBOL(compat_tcp_getsockopt); |
3fdadf7d | 3698 | #endif |
1da177e4 | 3699 | |
cfb6eeb4 | 3700 | #ifdef CONFIG_TCP_MD5SIG |
349ce993 | 3701 | static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool); |
71cea17e | 3702 | static DEFINE_MUTEX(tcp_md5sig_mutex); |
349ce993 | 3703 | static bool tcp_md5sig_pool_populated = false; |
cfb6eeb4 | 3704 | |
71cea17e | 3705 | static void __tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 3706 | { |
cf80e0e4 | 3707 | struct crypto_ahash *hash; |
cfb6eeb4 | 3708 | int cpu; |
cfb6eeb4 | 3709 | |
cf80e0e4 | 3710 | hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC); |
70477371 | 3711 | if (IS_ERR(hash)) |
cf80e0e4 HX |
3712 | return; |
3713 | ||
cfb6eeb4 | 3714 | for_each_possible_cpu(cpu) { |
19689e38 | 3715 | void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch; |
cf80e0e4 | 3716 | struct ahash_request *req; |
cfb6eeb4 | 3717 | |
19689e38 ED |
3718 | if (!scratch) { |
3719 | scratch = kmalloc_node(sizeof(union tcp_md5sum_block) + | |
3720 | sizeof(struct tcphdr), | |
3721 | GFP_KERNEL, | |
3722 | cpu_to_node(cpu)); | |
3723 | if (!scratch) | |
3724 | return; | |
3725 | per_cpu(tcp_md5sig_pool, cpu).scratch = scratch; | |
3726 | } | |
cf80e0e4 HX |
3727 | if (per_cpu(tcp_md5sig_pool, cpu).md5_req) |
3728 | continue; | |
3729 | ||
3730 | req = ahash_request_alloc(hash, GFP_KERNEL); | |
3731 | if (!req) | |
3732 | return; | |
3733 | ||
3734 | ahash_request_set_callback(req, 0, NULL, NULL); | |
3735 | ||
3736 | per_cpu(tcp_md5sig_pool, cpu).md5_req = req; | |
cfb6eeb4 | 3737 | } |
349ce993 ED |
3738 | /* before setting tcp_md5sig_pool_populated, we must commit all writes |
3739 | * to memory. See smp_rmb() in tcp_get_md5sig_pool() | |
71cea17e ED |
3740 | */ |
3741 | smp_wmb(); | |
349ce993 | 3742 | tcp_md5sig_pool_populated = true; |
cfb6eeb4 YH |
3743 | } |
3744 | ||
71cea17e | 3745 | bool tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 3746 | { |
349ce993 | 3747 | if (unlikely(!tcp_md5sig_pool_populated)) { |
71cea17e ED |
3748 | mutex_lock(&tcp_md5sig_mutex); |
3749 | ||
6015c71e | 3750 | if (!tcp_md5sig_pool_populated) { |
71cea17e | 3751 | __tcp_alloc_md5sig_pool(); |
6015c71e | 3752 | if (tcp_md5sig_pool_populated) |
921f9a0f | 3753 | static_branch_inc(&tcp_md5_needed); |
6015c71e | 3754 | } |
71cea17e ED |
3755 | |
3756 | mutex_unlock(&tcp_md5sig_mutex); | |
cfb6eeb4 | 3757 | } |
349ce993 | 3758 | return tcp_md5sig_pool_populated; |
cfb6eeb4 | 3759 | } |
cfb6eeb4 YH |
3760 | EXPORT_SYMBOL(tcp_alloc_md5sig_pool); |
3761 | ||
35790c04 ED |
3762 | |
3763 | /** | |
3764 | * tcp_get_md5sig_pool - get md5sig_pool for this user | |
3765 | * | |
3766 | * We use percpu structure, so if we succeed, we exit with preemption | |
3767 | * and BH disabled, to make sure another thread or softirq handling | |
3768 | * wont try to get same context. | |
3769 | */ | |
3770 | struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) | |
cfb6eeb4 | 3771 | { |
35790c04 | 3772 | local_bh_disable(); |
cfb6eeb4 | 3773 | |
349ce993 ED |
3774 | if (tcp_md5sig_pool_populated) { |
3775 | /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */ | |
3776 | smp_rmb(); | |
3777 | return this_cpu_ptr(&tcp_md5sig_pool); | |
3778 | } | |
35790c04 ED |
3779 | local_bh_enable(); |
3780 | return NULL; | |
3781 | } | |
3782 | EXPORT_SYMBOL(tcp_get_md5sig_pool); | |
cfb6eeb4 | 3783 | |
49a72dfb | 3784 | int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, |
cf533ea5 | 3785 | const struct sk_buff *skb, unsigned int header_len) |
49a72dfb AL |
3786 | { |
3787 | struct scatterlist sg; | |
3788 | const struct tcphdr *tp = tcp_hdr(skb); | |
cf80e0e4 | 3789 | struct ahash_request *req = hp->md5_req; |
95c96174 ED |
3790 | unsigned int i; |
3791 | const unsigned int head_data_len = skb_headlen(skb) > header_len ? | |
3792 | skb_headlen(skb) - header_len : 0; | |
49a72dfb | 3793 | const struct skb_shared_info *shi = skb_shinfo(skb); |
d7fd1b57 | 3794 | struct sk_buff *frag_iter; |
49a72dfb AL |
3795 | |
3796 | sg_init_table(&sg, 1); | |
3797 | ||
3798 | sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); | |
cf80e0e4 HX |
3799 | ahash_request_set_crypt(req, &sg, NULL, head_data_len); |
3800 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
3801 | return 1; |
3802 | ||
3803 | for (i = 0; i < shi->nr_frags; ++i) { | |
d8e18a51 | 3804 | const skb_frag_t *f = &shi->frags[i]; |
b54c9d5b | 3805 | unsigned int offset = skb_frag_off(f); |
54d27fcb ED |
3806 | struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); |
3807 | ||
3808 | sg_set_page(&sg, page, skb_frag_size(f), | |
3809 | offset_in_page(offset)); | |
cf80e0e4 HX |
3810 | ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f)); |
3811 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
3812 | return 1; |
3813 | } | |
3814 | ||
d7fd1b57 ED |
3815 | skb_walk_frags(skb, frag_iter) |
3816 | if (tcp_md5_hash_skb_data(hp, frag_iter, 0)) | |
3817 | return 1; | |
3818 | ||
49a72dfb AL |
3819 | return 0; |
3820 | } | |
49a72dfb AL |
3821 | EXPORT_SYMBOL(tcp_md5_hash_skb_data); |
3822 | ||
cf533ea5 | 3823 | int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key) |
49a72dfb AL |
3824 | { |
3825 | struct scatterlist sg; | |
3826 | ||
3827 | sg_init_one(&sg, key->key, key->keylen); | |
cf80e0e4 HX |
3828 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, key->keylen); |
3829 | return crypto_ahash_update(hp->md5_req); | |
49a72dfb | 3830 | } |
49a72dfb AL |
3831 | EXPORT_SYMBOL(tcp_md5_hash_key); |
3832 | ||
cfb6eeb4 YH |
3833 | #endif |
3834 | ||
4ac02bab AK |
3835 | void tcp_done(struct sock *sk) |
3836 | { | |
d983ea6f | 3837 | struct request_sock *req; |
8336886f | 3838 | |
d983ea6f ED |
3839 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, |
3840 | lockdep_sock_is_held(sk)); | |
5a5f3a8d | 3841 | if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV) |
c10d9310 | 3842 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS); |
4ac02bab AK |
3843 | |
3844 | tcp_set_state(sk, TCP_CLOSE); | |
3845 | tcp_clear_xmit_timers(sk); | |
00db4124 | 3846 | if (req) |
8336886f | 3847 | reqsk_fastopen_remove(sk, req, false); |
4ac02bab AK |
3848 | |
3849 | sk->sk_shutdown = SHUTDOWN_MASK; | |
3850 | ||
3851 | if (!sock_flag(sk, SOCK_DEAD)) | |
3852 | sk->sk_state_change(sk); | |
3853 | else | |
3854 | inet_csk_destroy_sock(sk); | |
3855 | } | |
3856 | EXPORT_SYMBOL_GPL(tcp_done); | |
3857 | ||
c1e64e29 LC |
3858 | int tcp_abort(struct sock *sk, int err) |
3859 | { | |
3860 | if (!sk_fullsock(sk)) { | |
07f6f4a3 ED |
3861 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
3862 | struct request_sock *req = inet_reqsk(sk); | |
3863 | ||
3864 | local_bh_disable(); | |
acc2cf4e | 3865 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); |
07f6f4a3 ED |
3866 | local_bh_enable(); |
3867 | return 0; | |
3868 | } | |
c1e64e29 LC |
3869 | return -EOPNOTSUPP; |
3870 | } | |
3871 | ||
3872 | /* Don't race with userspace socket closes such as tcp_close. */ | |
3873 | lock_sock(sk); | |
3874 | ||
2010b93e LC |
3875 | if (sk->sk_state == TCP_LISTEN) { |
3876 | tcp_set_state(sk, TCP_CLOSE); | |
3877 | inet_csk_listen_stop(sk); | |
3878 | } | |
3879 | ||
c1e64e29 LC |
3880 | /* Don't race with BH socket closes such as inet_csk_listen_stop. */ |
3881 | local_bh_disable(); | |
3882 | bh_lock_sock(sk); | |
3883 | ||
3884 | if (!sock_flag(sk, SOCK_DEAD)) { | |
3885 | sk->sk_err = err; | |
3886 | /* This barrier is coupled with smp_rmb() in tcp_poll() */ | |
3887 | smp_wmb(); | |
3888 | sk->sk_error_report(sk); | |
3889 | if (tcp_need_reset(sk->sk_state)) | |
3890 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
3891 | tcp_done(sk); | |
3892 | } | |
3893 | ||
3894 | bh_unlock_sock(sk); | |
3895 | local_bh_enable(); | |
e05836ac | 3896 | tcp_write_queue_purge(sk); |
c1e64e29 | 3897 | release_sock(sk); |
c1e64e29 LC |
3898 | return 0; |
3899 | } | |
3900 | EXPORT_SYMBOL_GPL(tcp_abort); | |
3901 | ||
5f8ef48d | 3902 | extern struct tcp_congestion_ops tcp_reno; |
1da177e4 LT |
3903 | |
3904 | static __initdata unsigned long thash_entries; | |
3905 | static int __init set_thash_entries(char *str) | |
3906 | { | |
413c27d8 EZ |
3907 | ssize_t ret; |
3908 | ||
1da177e4 LT |
3909 | if (!str) |
3910 | return 0; | |
413c27d8 EZ |
3911 | |
3912 | ret = kstrtoul(str, 0, &thash_entries); | |
3913 | if (ret) | |
3914 | return 0; | |
3915 | ||
1da177e4 LT |
3916 | return 1; |
3917 | } | |
3918 | __setup("thash_entries=", set_thash_entries); | |
3919 | ||
47d7a88c | 3920 | static void __init tcp_init_mem(void) |
4acb4190 | 3921 | { |
b66e91cc ED |
3922 | unsigned long limit = nr_free_buffer_pages() / 16; |
3923 | ||
4acb4190 | 3924 | limit = max(limit, 128UL); |
b66e91cc ED |
3925 | sysctl_tcp_mem[0] = limit / 4 * 3; /* 4.68 % */ |
3926 | sysctl_tcp_mem[1] = limit; /* 6.25 % */ | |
3927 | sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; /* 9.37 % */ | |
4acb4190 GC |
3928 | } |
3929 | ||
1da177e4 LT |
3930 | void __init tcp_init(void) |
3931 | { | |
b49960a0 | 3932 | int max_rshare, max_wshare, cnt; |
b2d3ea4a | 3933 | unsigned long limit; |
074b8517 | 3934 | unsigned int i; |
1da177e4 | 3935 | |
3b4929f6 | 3936 | BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE); |
b2d3ea4a ED |
3937 | BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > |
3938 | FIELD_SIZEOF(struct sk_buff, cb)); | |
1da177e4 | 3939 | |
908c7f19 TH |
3940 | percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL); |
3941 | percpu_counter_init(&tcp_orphan_count, 0, GFP_KERNEL); | |
1946e672 | 3942 | inet_hashinfo_init(&tcp_hashinfo); |
27da6d37 MKL |
3943 | inet_hashinfo2_init(&tcp_hashinfo, "tcp_listen_portaddr_hash", |
3944 | thash_entries, 21, /* one slot per 2 MB*/ | |
3945 | 0, 64 * 1024); | |
6e04e021 ACM |
3946 | tcp_hashinfo.bind_bucket_cachep = |
3947 | kmem_cache_create("tcp_bind_bucket", | |
3948 | sizeof(struct inet_bind_bucket), 0, | |
20c2df83 | 3949 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4 | 3950 | |
1da177e4 LT |
3951 | /* Size and allocate the main established and bind bucket |
3952 | * hash tables. | |
3953 | * | |
3954 | * The methodology is similar to that of the buffer cache. | |
3955 | */ | |
6e04e021 | 3956 | tcp_hashinfo.ehash = |
1da177e4 | 3957 | alloc_large_system_hash("TCP established", |
0f7ff927 | 3958 | sizeof(struct inet_ehash_bucket), |
1da177e4 | 3959 | thash_entries, |
fd90b29d | 3960 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 3961 | 0, |
1da177e4 | 3962 | NULL, |
f373b53b | 3963 | &tcp_hashinfo.ehash_mask, |
31fe62b9 | 3964 | 0, |
0ccfe618 | 3965 | thash_entries ? 0 : 512 * 1024); |
05dbc7b5 | 3966 | for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) |
3ab5aee7 | 3967 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i); |
05dbc7b5 | 3968 | |
230140cf ED |
3969 | if (inet_ehash_locks_alloc(&tcp_hashinfo)) |
3970 | panic("TCP: failed to alloc ehash_locks"); | |
6e04e021 | 3971 | tcp_hashinfo.bhash = |
1da177e4 | 3972 | alloc_large_system_hash("TCP bind", |
0f7ff927 | 3973 | sizeof(struct inet_bind_hashbucket), |
f373b53b | 3974 | tcp_hashinfo.ehash_mask + 1, |
fd90b29d | 3975 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 3976 | 0, |
6e04e021 | 3977 | &tcp_hashinfo.bhash_size, |
1da177e4 | 3978 | NULL, |
31fe62b9 | 3979 | 0, |
1da177e4 | 3980 | 64 * 1024); |
074b8517 | 3981 | tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size; |
6e04e021 ACM |
3982 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
3983 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); | |
3984 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); | |
1da177e4 LT |
3985 | } |
3986 | ||
c5ed63d6 ED |
3987 | |
3988 | cnt = tcp_hashinfo.ehash_mask + 1; | |
c5ed63d6 | 3989 | sysctl_tcp_max_orphans = cnt / 2; |
1da177e4 | 3990 | |
a4fe34bf | 3991 | tcp_init_mem(); |
c43b874d | 3992 | /* Set per-socket limits to no more than 1/128 the pressure threshold */ |
5fb84b14 | 3993 | limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); |
b49960a0 ED |
3994 | max_wshare = min(4UL*1024*1024, limit); |
3995 | max_rshare = min(6UL*1024*1024, limit); | |
7b4f4b5e | 3996 | |
356d1833 ED |
3997 | init_net.ipv4.sysctl_tcp_wmem[0] = SK_MEM_QUANTUM; |
3998 | init_net.ipv4.sysctl_tcp_wmem[1] = 16*1024; | |
3999 | init_net.ipv4.sysctl_tcp_wmem[2] = max(64*1024, max_wshare); | |
7b4f4b5e | 4000 | |
356d1833 | 4001 | init_net.ipv4.sysctl_tcp_rmem[0] = SK_MEM_QUANTUM; |
a337531b YC |
4002 | init_net.ipv4.sysctl_tcp_rmem[1] = 131072; |
4003 | init_net.ipv4.sysctl_tcp_rmem[2] = max(131072, max_rshare); | |
1da177e4 | 4004 | |
afd46503 | 4005 | pr_info("Hash tables configured (established %u bind %u)\n", |
058bd4d2 | 4006 | tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size); |
317a76f9 | 4007 | |
1946e672 | 4008 | tcp_v4_init(); |
51c5d0c4 | 4009 | tcp_metrics_init(); |
55d8694f | 4010 | BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0); |
46d3ceab | 4011 | tcp_tasklet_init(); |
1da177e4 | 4012 | } |