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 | 262 | #include <linux/highmem.h> |
b8059ead | 263 | #include <linux/cache.h> |
f4c50d99 | 264 | #include <linux/err.h> |
da5c78c8 | 265 | #include <linux/time.h> |
5a0e3ad6 | 266 | #include <linux/slab.h> |
98aaa913 | 267 | #include <linux/errqueue.h> |
60e2a778 | 268 | #include <linux/static_key.h> |
97a19caf | 269 | #include <linux/btf.h> |
1da177e4 LT |
270 | |
271 | #include <net/icmp.h> | |
cf60af03 | 272 | #include <net/inet_common.h> |
1da177e4 | 273 | #include <net/tcp.h> |
f870fa0b | 274 | #include <net/mptcp.h> |
1da177e4 LT |
275 | #include <net/xfrm.h> |
276 | #include <net/ip.h> | |
9c55e01c | 277 | #include <net/sock.h> |
1da177e4 | 278 | |
7c0f6ba6 | 279 | #include <linux/uaccess.h> |
1da177e4 | 280 | #include <asm/ioctls.h> |
076bb0c8 | 281 | #include <net/busy_poll.h> |
1da177e4 | 282 | |
925bba24 AR |
283 | /* Track pending CMSGs. */ |
284 | enum { | |
285 | TCP_CMSG_INQ = 1, | |
286 | TCP_CMSG_TS = 2 | |
287 | }; | |
288 | ||
19757ceb ED |
289 | DEFINE_PER_CPU(unsigned int, tcp_orphan_count); |
290 | EXPORT_PER_CPU_SYMBOL_GPL(tcp_orphan_count); | |
0a5578cf | 291 | |
a4fe34bf | 292 | long sysctl_tcp_mem[3] __read_mostly; |
a4fe34bf | 293 | EXPORT_SYMBOL(sysctl_tcp_mem); |
1da177e4 | 294 | |
91b6d325 | 295 | atomic_long_t tcp_memory_allocated ____cacheline_aligned_in_smp; /* Current allocated memory. */ |
1da177e4 | 296 | EXPORT_SYMBOL(tcp_memory_allocated); |
0defbb0a ED |
297 | DEFINE_PER_CPU(int, tcp_memory_per_cpu_fw_alloc); |
298 | EXPORT_PER_CPU_SYMBOL_GPL(tcp_memory_per_cpu_fw_alloc); | |
1748376b | 299 | |
60e2a778 UB |
300 | #if IS_ENABLED(CONFIG_SMC) |
301 | DEFINE_STATIC_KEY_FALSE(tcp_have_smc); | |
302 | EXPORT_SYMBOL(tcp_have_smc); | |
303 | #endif | |
304 | ||
1748376b ED |
305 | /* |
306 | * Current number of TCP sockets. | |
307 | */ | |
91b6d325 | 308 | struct percpu_counter tcp_sockets_allocated ____cacheline_aligned_in_smp; |
1da177e4 LT |
309 | EXPORT_SYMBOL(tcp_sockets_allocated); |
310 | ||
9c55e01c JA |
311 | /* |
312 | * TCP splice context | |
313 | */ | |
314 | struct tcp_splice_state { | |
315 | struct pipe_inode_info *pipe; | |
316 | size_t len; | |
317 | unsigned int flags; | |
318 | }; | |
319 | ||
1da177e4 LT |
320 | /* |
321 | * Pressure flag: try to collapse. | |
322 | * Technical note: it is used by multiple contexts non atomically. | |
3ab224be | 323 | * All the __sk_mem_schedule() is of this nature: accounting |
1da177e4 LT |
324 | * is strict, actions are advisory and have some latency. |
325 | */ | |
06044751 ED |
326 | unsigned long tcp_memory_pressure __read_mostly; |
327 | EXPORT_SYMBOL_GPL(tcp_memory_pressure); | |
1da177e4 | 328 | |
5c52ba17 | 329 | void tcp_enter_memory_pressure(struct sock *sk) |
1da177e4 | 330 | { |
06044751 ED |
331 | unsigned long val; |
332 | ||
1f142c17 | 333 | if (READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
334 | return; |
335 | val = jiffies; | |
336 | ||
337 | if (!val) | |
338 | val--; | |
339 | if (!cmpxchg(&tcp_memory_pressure, 0, val)) | |
4e673444 | 340 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES); |
1da177e4 | 341 | } |
06044751 ED |
342 | EXPORT_SYMBOL_GPL(tcp_enter_memory_pressure); |
343 | ||
344 | void tcp_leave_memory_pressure(struct sock *sk) | |
345 | { | |
346 | unsigned long val; | |
347 | ||
1f142c17 | 348 | if (!READ_ONCE(tcp_memory_pressure)) |
06044751 ED |
349 | return; |
350 | val = xchg(&tcp_memory_pressure, 0); | |
351 | if (val) | |
352 | NET_ADD_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURESCHRONO, | |
353 | jiffies_to_msecs(jiffies - val)); | |
354 | } | |
355 | EXPORT_SYMBOL_GPL(tcp_leave_memory_pressure); | |
1da177e4 | 356 | |
b103cf34 JA |
357 | /* Convert seconds to retransmits based on initial and max timeout */ |
358 | static u8 secs_to_retrans(int seconds, int timeout, int rto_max) | |
359 | { | |
360 | u8 res = 0; | |
361 | ||
362 | if (seconds > 0) { | |
363 | int period = timeout; | |
364 | ||
365 | res = 1; | |
366 | while (seconds > period && res < 255) { | |
367 | res++; | |
368 | timeout <<= 1; | |
369 | if (timeout > rto_max) | |
370 | timeout = rto_max; | |
371 | period += timeout; | |
372 | } | |
373 | } | |
374 | return res; | |
375 | } | |
376 | ||
377 | /* Convert retransmits to seconds based on initial and max timeout */ | |
378 | static int retrans_to_secs(u8 retrans, int timeout, int rto_max) | |
379 | { | |
380 | int period = 0; | |
381 | ||
382 | if (retrans > 0) { | |
383 | period = timeout; | |
384 | while (--retrans) { | |
385 | timeout <<= 1; | |
386 | if (timeout > rto_max) | |
387 | timeout = rto_max; | |
388 | period += timeout; | |
389 | } | |
390 | } | |
391 | return period; | |
392 | } | |
393 | ||
0263598c WW |
394 | static u64 tcp_compute_delivery_rate(const struct tcp_sock *tp) |
395 | { | |
396 | u32 rate = READ_ONCE(tp->rate_delivered); | |
397 | u32 intv = READ_ONCE(tp->rate_interval_us); | |
398 | u64 rate64 = 0; | |
399 | ||
400 | if (rate && intv) { | |
401 | rate64 = (u64)rate * tp->mss_cache * USEC_PER_SEC; | |
402 | do_div(rate64, intv); | |
403 | } | |
404 | return rate64; | |
405 | } | |
406 | ||
900f65d3 NC |
407 | /* Address-family independent initialization for a tcp_sock. |
408 | * | |
409 | * NOTE: A lot of things set to zero explicitly by call to | |
410 | * sk_alloc() so need not be done here. | |
411 | */ | |
412 | void tcp_init_sock(struct sock *sk) | |
413 | { | |
414 | struct inet_connection_sock *icsk = inet_csk(sk); | |
415 | struct tcp_sock *tp = tcp_sk(sk); | |
416 | ||
9f5afeae | 417 | tp->out_of_order_queue = RB_ROOT; |
75c119af | 418 | sk->tcp_rtx_queue = RB_ROOT; |
900f65d3 | 419 | tcp_init_xmit_timers(sk); |
46d3ceab | 420 | INIT_LIST_HEAD(&tp->tsq_node); |
e2080072 | 421 | INIT_LIST_HEAD(&tp->tsorted_sent_queue); |
900f65d3 NC |
422 | |
423 | icsk->icsk_rto = TCP_TIMEOUT_INIT; | |
ca584ba0 | 424 | icsk->icsk_rto_min = TCP_RTO_MIN; |
2b8ee4f0 | 425 | icsk->icsk_delack_max = TCP_DELACK_MAX; |
740b0f18 | 426 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
ac9517fc | 427 | minmax_reset(&tp->rtt_min, tcp_jiffies32, ~0U); |
900f65d3 NC |
428 | |
429 | /* So many TCP implementations out there (incorrectly) count the | |
430 | * initial SYN frame in their delayed-ACK and congestion control | |
431 | * algorithms that we must have the following bandaid to talk | |
432 | * efficiently to them. -DaveM | |
433 | */ | |
40570375 | 434 | tcp_snd_cwnd_set(tp, TCP_INIT_CWND); |
900f65d3 | 435 | |
d7722e85 SHY |
436 | /* There's a bubble in the pipe until at least the first ACK. */ |
437 | tp->app_limited = ~0U; | |
438 | ||
900f65d3 NC |
439 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
440 | * initialization of these values. | |
441 | */ | |
442 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; | |
443 | tp->snd_cwnd_clamp = ~0; | |
444 | tp->mss_cache = TCP_MSS_DEFAULT; | |
445 | ||
46778cd1 | 446 | tp->reordering = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_reordering); |
55d8694f | 447 | tcp_assign_congestion_control(sk); |
900f65d3 | 448 | |
ceaa1fef | 449 | tp->tsoffset = 0; |
1f255691 | 450 | tp->rack.reo_wnd_steps = 1; |
ceaa1fef | 451 | |
900f65d3 NC |
452 | sk->sk_write_space = sk_stream_write_space; |
453 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
454 | ||
455 | icsk->icsk_sync_mss = tcp_sync_mss; | |
456 | ||
02739545 KI |
457 | WRITE_ONCE(sk->sk_sndbuf, READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_wmem[1])); |
458 | WRITE_ONCE(sk->sk_rcvbuf, READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[1])); | |
900f65d3 | 459 | |
e993ffe3 | 460 | set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); |
900f65d3 | 461 | sk_sockets_allocated_inc(sk); |
900f65d3 NC |
462 | } |
463 | EXPORT_SYMBOL(tcp_init_sock); | |
464 | ||
4e8cc228 | 465 | static void tcp_tx_timestamp(struct sock *sk, u16 tsflags) |
4ed2d765 | 466 | { |
4e8cc228 ED |
467 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
468 | ||
ad02c4f5 | 469 | if (tsflags && skb) { |
f066e2b0 | 470 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
6b084928 | 471 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
4ed2d765 | 472 | |
c14ac945 | 473 | sock_tx_timestamp(sk, tsflags, &shinfo->tx_flags); |
0a2cf20c SHY |
474 | if (tsflags & SOF_TIMESTAMPING_TX_ACK) |
475 | tcb->txstamp_ack = 1; | |
476 | if (tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) | |
f066e2b0 WB |
477 | shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1; |
478 | } | |
4ed2d765 WB |
479 | } |
480 | ||
05dc72ab | 481 | static bool tcp_stream_is_readable(struct sock *sk, int target) |
8934ce2f | 482 | { |
05dc72ab ED |
483 | if (tcp_epollin_ready(sk, target)) |
484 | return true; | |
7b50ecfc | 485 | return sk_is_readable(sk); |
8934ce2f JF |
486 | } |
487 | ||
1da177e4 | 488 | /* |
a11e1d43 LT |
489 | * Wait for a TCP event. |
490 | * | |
491 | * Note that we don't need to lock the socket, as the upper poll layers | |
492 | * take care of normal races (between the test and the event) and we don't | |
493 | * go look at any of the socket buffers directly. | |
1da177e4 | 494 | */ |
a11e1d43 | 495 | __poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 | 496 | { |
a11e1d43 | 497 | __poll_t mask; |
1da177e4 | 498 | struct sock *sk = sock->sk; |
cf533ea5 | 499 | const struct tcp_sock *tp = tcp_sk(sk); |
00fd38d9 | 500 | int state; |
1da177e4 | 501 | |
89ab066d | 502 | sock_poll_wait(file, sock, wait); |
a11e1d43 | 503 | |
986ffdfd | 504 | state = inet_sk_state_load(sk); |
00fd38d9 | 505 | if (state == TCP_LISTEN) |
dc40c7bc | 506 | return inet_csk_listen_poll(sk); |
1da177e4 | 507 | |
a11e1d43 LT |
508 | /* Socket is not locked. We are protected from async events |
509 | * by poll logic and correct handling of state changes | |
510 | * made by other threads is impossible in any case. | |
511 | */ | |
512 | ||
513 | mask = 0; | |
514 | ||
1da177e4 | 515 | /* |
a9a08845 | 516 | * EPOLLHUP is certainly not done right. But poll() doesn't |
1da177e4 LT |
517 | * have a notion of HUP in just one direction, and for a |
518 | * socket the read side is more interesting. | |
519 | * | |
a9a08845 LT |
520 | * Some poll() documentation says that EPOLLHUP is incompatible |
521 | * with the EPOLLOUT/POLLWR flags, so somebody should check this | |
1da177e4 LT |
522 | * all. But careful, it tends to be safer to return too many |
523 | * bits than too few, and you can easily break real applications | |
524 | * if you don't tell them that something has hung up! | |
525 | * | |
526 | * Check-me. | |
527 | * | |
a9a08845 | 528 | * Check number 1. EPOLLHUP is _UNMASKABLE_ event (see UNIX98 and |
1da177e4 LT |
529 | * our fs/select.c). It means that after we received EOF, |
530 | * poll always returns immediately, making impossible poll() on write() | |
a9a08845 | 531 | * in state CLOSE_WAIT. One solution is evident --- to set EPOLLHUP |
1da177e4 LT |
532 | * if and only if shutdown has been made in both directions. |
533 | * Actually, it is interesting to look how Solaris and DUX | |
a9a08845 | 534 | * solve this dilemma. I would prefer, if EPOLLHUP were maskable, |
1da177e4 LT |
535 | * then we could set it on SND_SHUTDOWN. BTW examples given |
536 | * in Stevens' books assume exactly this behaviour, it explains | |
a9a08845 | 537 | * why EPOLLHUP is incompatible with EPOLLOUT. --ANK |
1da177e4 LT |
538 | * |
539 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent | |
540 | * blocking on fresh not-connected or disconnected socket. --ANK | |
541 | */ | |
00fd38d9 | 542 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
a9a08845 | 543 | mask |= EPOLLHUP; |
1da177e4 | 544 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 545 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
1da177e4 | 546 | |
8336886f | 547 | /* Connected or passive Fast Open socket? */ |
00fd38d9 | 548 | if (state != TCP_SYN_SENT && |
d983ea6f | 549 | (state != TCP_SYN_RECV || rcu_access_pointer(tp->fastopen_rsk))) { |
c7004482 | 550 | int target = sock_rcvlowat(sk, 0, INT_MAX); |
7b6a893a | 551 | u16 urg_data = READ_ONCE(tp->urg_data); |
c7004482 | 552 | |
b96c51bd | 553 | if (unlikely(urg_data) && |
7b6a893a ED |
554 | READ_ONCE(tp->urg_seq) == READ_ONCE(tp->copied_seq) && |
555 | !sock_flag(sk, SOCK_URGINLINE)) | |
b634f875 | 556 | target++; |
c7004482 | 557 | |
05dc72ab | 558 | if (tcp_stream_is_readable(sk, target)) |
a9a08845 | 559 | mask |= EPOLLIN | EPOLLRDNORM; |
1da177e4 LT |
560 | |
561 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { | |
8ba3c9d1 | 562 | if (__sk_stream_is_writeable(sk, 1)) { |
a9a08845 | 563 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 564 | } else { /* send SIGIO later */ |
9cd3e072 | 565 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
566 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
567 | ||
568 | /* Race breaker. If space is freed after | |
569 | * wspace test but before the flags are set, | |
3c715127 | 570 | * IO signal will be lost. Memory barrier |
571 | * pairs with the input side. | |
1da177e4 | 572 | */ |
3c715127 | 573 | smp_mb__after_atomic(); |
8ba3c9d1 | 574 | if (__sk_stream_is_writeable(sk, 1)) |
a9a08845 | 575 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 576 | } |
d84ba638 | 577 | } else |
a9a08845 | 578 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 579 | |
7b6a893a | 580 | if (urg_data & TCP_URG_VALID) |
a9a08845 | 581 | mask |= EPOLLPRI; |
d68be71e | 582 | } else if (state == TCP_SYN_SENT && inet_sk(sk)->defer_connect) { |
19f6d3f3 | 583 | /* Active TCP fastopen socket with defer_connect |
a9a08845 | 584 | * Return EPOLLOUT so application can call write() |
19f6d3f3 WW |
585 | * in order for kernel to generate SYN+data |
586 | */ | |
a9a08845 | 587 | mask |= EPOLLOUT | EPOLLWRNORM; |
1da177e4 | 588 | } |
a4d25803 TM |
589 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
590 | smp_rmb(); | |
3ef7cf57 | 591 | if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue)) |
a9a08845 | 592 | mask |= EPOLLERR; |
a4d25803 | 593 | |
1da177e4 LT |
594 | return mask; |
595 | } | |
a11e1d43 | 596 | EXPORT_SYMBOL(tcp_poll); |
1da177e4 LT |
597 | |
598 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
599 | { | |
600 | struct tcp_sock *tp = tcp_sk(sk); | |
601 | int answ; | |
0e71c55c | 602 | bool slow; |
1da177e4 LT |
603 | |
604 | switch (cmd) { | |
605 | case SIOCINQ: | |
606 | if (sk->sk_state == TCP_LISTEN) | |
607 | return -EINVAL; | |
608 | ||
0e71c55c | 609 | slow = lock_sock_fast(sk); |
473bd239 | 610 | answ = tcp_inq(sk); |
0e71c55c | 611 | unlock_sock_fast(sk, slow); |
1da177e4 LT |
612 | break; |
613 | case SIOCATMARK: | |
7b6a893a | 614 | answ = READ_ONCE(tp->urg_data) && |
d9b55bf7 | 615 | READ_ONCE(tp->urg_seq) == READ_ONCE(tp->copied_seq); |
1da177e4 LT |
616 | break; |
617 | case SIOCOUTQ: | |
618 | if (sk->sk_state == TCP_LISTEN) | |
619 | return -EINVAL; | |
620 | ||
621 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
622 | answ = 0; | |
623 | else | |
0f317464 | 624 | answ = READ_ONCE(tp->write_seq) - tp->snd_una; |
1da177e4 | 625 | break; |
2f4e1b39 MS |
626 | case SIOCOUTQNSD: |
627 | if (sk->sk_state == TCP_LISTEN) | |
628 | return -EINVAL; | |
629 | ||
630 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) | |
631 | answ = 0; | |
632 | else | |
e0d694d6 ED |
633 | answ = READ_ONCE(tp->write_seq) - |
634 | READ_ONCE(tp->snd_nxt); | |
2f4e1b39 | 635 | break; |
1da177e4 LT |
636 | default: |
637 | return -ENOIOCTLCMD; | |
3ff50b79 | 638 | } |
1da177e4 LT |
639 | |
640 | return put_user(answ, (int __user *)arg); | |
641 | } | |
4bc2f18b | 642 | EXPORT_SYMBOL(tcp_ioctl); |
1da177e4 | 643 | |
04d8825c | 644 | void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
1da177e4 | 645 | { |
4de075e0 | 646 | TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; |
1da177e4 LT |
647 | tp->pushed_seq = tp->write_seq; |
648 | } | |
649 | ||
a2a385d6 | 650 | static inline bool forced_push(const struct tcp_sock *tp) |
1da177e4 LT |
651 | { |
652 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); | |
653 | } | |
654 | ||
04d8825c | 655 | void tcp_skb_entail(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 656 | { |
9e412ba7 | 657 | struct tcp_sock *tp = tcp_sk(sk); |
352d4800 ACM |
658 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
659 | ||
352d4800 | 660 | tcb->seq = tcb->end_seq = tp->write_seq; |
4de075e0 | 661 | tcb->tcp_flags = TCPHDR_ACK; |
f4a775d1 | 662 | __skb_header_release(skb); |
fe067e8a | 663 | tcp_add_write_queue_tail(sk, skb); |
ab4e846a | 664 | sk_wmem_queued_add(sk, skb->truesize); |
3ab224be | 665 | sk_mem_charge(sk, skb->truesize); |
89ebd197 | 666 | if (tp->nonagle & TCP_NAGLE_PUSH) |
e905a9ed | 667 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
6f021c62 ED |
668 | |
669 | tcp_slow_start_after_idle_check(sk); | |
1da177e4 LT |
670 | } |
671 | ||
afeca340 | 672 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags) |
1da177e4 | 673 | { |
33f5f57e | 674 | if (flags & MSG_OOB) |
1da177e4 | 675 | tp->snd_up = tp->write_seq; |
1da177e4 LT |
676 | } |
677 | ||
f54b3111 | 678 | /* If a not yet filled skb is pushed, do not send it if |
a181ceb5 | 679 | * we have data packets in Qdisc or NIC queues : |
f54b3111 ED |
680 | * Because TX completion will happen shortly, it gives a chance |
681 | * to coalesce future sendmsg() payload into this skb, without | |
682 | * need for a timer, and with no latency trade off. | |
683 | * As packets containing data payload have a bigger truesize | |
a181ceb5 ED |
684 | * than pure acks (dataless) packets, the last checks prevent |
685 | * autocorking if we only have an ACK in Qdisc/NIC queues, | |
686 | * or if TX completion was delayed after we processed ACK packet. | |
f54b3111 ED |
687 | */ |
688 | static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb, | |
689 | int size_goal) | |
1da177e4 | 690 | { |
f54b3111 | 691 | return skb->len < size_goal && |
85225e6f | 692 | READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_autocorking) && |
114f39fe | 693 | !tcp_rtx_queue_empty(sk) && |
b0de0cf4 ED |
694 | refcount_read(&sk->sk_wmem_alloc) > skb->truesize && |
695 | tcp_skb_can_collapse_to(skb); | |
f54b3111 ED |
696 | } |
697 | ||
35b2c321 MM |
698 | void tcp_push(struct sock *sk, int flags, int mss_now, |
699 | int nonagle, int size_goal) | |
f54b3111 ED |
700 | { |
701 | struct tcp_sock *tp = tcp_sk(sk); | |
702 | struct sk_buff *skb; | |
afeca340 | 703 | |
f54b3111 | 704 | skb = tcp_write_queue_tail(sk); |
75c119af ED |
705 | if (!skb) |
706 | return; | |
f54b3111 ED |
707 | if (!(flags & MSG_MORE) || forced_push(tp)) |
708 | tcp_mark_push(tp, skb); | |
709 | ||
710 | tcp_mark_urg(tp, flags); | |
711 | ||
712 | if (tcp_should_autocork(sk, skb, size_goal)) { | |
713 | ||
714 | /* avoid atomic op if TSQ_THROTTLED bit is already set */ | |
7aa5470c | 715 | if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) { |
f54b3111 | 716 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING); |
7aa5470c | 717 | set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags); |
f54b3111 | 718 | } |
a181ceb5 ED |
719 | /* It is possible TX completion already happened |
720 | * before we set TSQ_THROTTLED. | |
721 | */ | |
14afee4b | 722 | if (refcount_read(&sk->sk_wmem_alloc) > skb->truesize) |
a181ceb5 | 723 | return; |
1da177e4 | 724 | } |
f54b3111 ED |
725 | |
726 | if (flags & MSG_MORE) | |
727 | nonagle = TCP_NAGLE_CORK; | |
728 | ||
729 | __tcp_push_pending_frames(sk, mss_now, nonagle); | |
1da177e4 LT |
730 | } |
731 | ||
6ff7751d AB |
732 | static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
733 | unsigned int offset, size_t len) | |
9c55e01c JA |
734 | { |
735 | struct tcp_splice_state *tss = rd_desc->arg.data; | |
33966dd0 | 736 | int ret; |
9c55e01c | 737 | |
a60e3cc7 | 738 | ret = skb_splice_bits(skb, skb->sk, offset, tss->pipe, |
25869262 | 739 | min(rd_desc->count, len), tss->flags); |
33966dd0 WT |
740 | if (ret > 0) |
741 | rd_desc->count -= ret; | |
742 | return ret; | |
9c55e01c JA |
743 | } |
744 | ||
745 | static int __tcp_splice_read(struct sock *sk, struct tcp_splice_state *tss) | |
746 | { | |
747 | /* Store TCP splice context information in read_descriptor_t. */ | |
748 | read_descriptor_t rd_desc = { | |
749 | .arg.data = tss, | |
33966dd0 | 750 | .count = tss->len, |
9c55e01c JA |
751 | }; |
752 | ||
753 | return tcp_read_sock(sk, &rd_desc, tcp_splice_data_recv); | |
754 | } | |
755 | ||
756 | /** | |
757 | * tcp_splice_read - splice data from TCP socket to a pipe | |
758 | * @sock: socket to splice from | |
759 | * @ppos: position (not valid) | |
760 | * @pipe: pipe to splice to | |
761 | * @len: number of bytes to splice | |
762 | * @flags: splice modifier flags | |
763 | * | |
764 | * Description: | |
765 | * Will read pages from given socket and fill them into a pipe. | |
766 | * | |
767 | **/ | |
768 | ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos, | |
769 | struct pipe_inode_info *pipe, size_t len, | |
770 | unsigned int flags) | |
771 | { | |
772 | struct sock *sk = sock->sk; | |
773 | struct tcp_splice_state tss = { | |
774 | .pipe = pipe, | |
775 | .len = len, | |
776 | .flags = flags, | |
777 | }; | |
778 | long timeo; | |
779 | ssize_t spliced; | |
780 | int ret; | |
781 | ||
3a047bf8 | 782 | sock_rps_record_flow(sk); |
9c55e01c JA |
783 | /* |
784 | * We can't seek on a socket input | |
785 | */ | |
786 | if (unlikely(*ppos)) | |
787 | return -ESPIPE; | |
788 | ||
789 | ret = spliced = 0; | |
790 | ||
791 | lock_sock(sk); | |
792 | ||
42324c62 | 793 | timeo = sock_rcvtimeo(sk, sock->file->f_flags & O_NONBLOCK); |
9c55e01c JA |
794 | while (tss.len) { |
795 | ret = __tcp_splice_read(sk, &tss); | |
796 | if (ret < 0) | |
797 | break; | |
798 | else if (!ret) { | |
799 | if (spliced) | |
800 | break; | |
9c55e01c JA |
801 | if (sock_flag(sk, SOCK_DONE)) |
802 | break; | |
803 | if (sk->sk_err) { | |
804 | ret = sock_error(sk); | |
805 | break; | |
806 | } | |
807 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
808 | break; | |
809 | if (sk->sk_state == TCP_CLOSE) { | |
810 | /* | |
811 | * This occurs when user tries to read | |
812 | * from never connected socket. | |
813 | */ | |
c47078d6 | 814 | ret = -ENOTCONN; |
9c55e01c JA |
815 | break; |
816 | } | |
817 | if (!timeo) { | |
818 | ret = -EAGAIN; | |
819 | break; | |
820 | } | |
ccf7abb9 ED |
821 | /* if __tcp_splice_read() got nothing while we have |
822 | * an skb in receive queue, we do not want to loop. | |
823 | * This might happen with URG data. | |
824 | */ | |
825 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
826 | break; | |
dfbafc99 | 827 | sk_wait_data(sk, &timeo, NULL); |
9c55e01c JA |
828 | if (signal_pending(current)) { |
829 | ret = sock_intr_errno(timeo); | |
830 | break; | |
831 | } | |
832 | continue; | |
833 | } | |
834 | tss.len -= ret; | |
835 | spliced += ret; | |
836 | ||
33966dd0 WT |
837 | if (!timeo) |
838 | break; | |
9c55e01c JA |
839 | release_sock(sk); |
840 | lock_sock(sk); | |
841 | ||
842 | if (sk->sk_err || sk->sk_state == TCP_CLOSE || | |
33966dd0 | 843 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
9c55e01c JA |
844 | signal_pending(current)) |
845 | break; | |
846 | } | |
847 | ||
848 | release_sock(sk); | |
849 | ||
850 | if (spliced) | |
851 | return spliced; | |
852 | ||
853 | return ret; | |
854 | } | |
4bc2f18b | 855 | EXPORT_SYMBOL(tcp_splice_read); |
9c55e01c | 856 | |
f8dd3b8d ED |
857 | struct sk_buff *tcp_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
858 | bool force_schedule) | |
f561d0f2 PE |
859 | { |
860 | struct sk_buff *skb; | |
861 | ||
8a794df6 | 862 | skb = alloc_skb_fclone(size + MAX_TCP_HEADER, gfp); |
8e4d980a | 863 | if (likely(skb)) { |
eb934478 | 864 | bool mem_scheduled; |
8e4d980a | 865 | |
9b65b17d | 866 | skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); |
eb934478 ED |
867 | if (force_schedule) { |
868 | mem_scheduled = true; | |
8e4d980a ED |
869 | sk_forced_mem_schedule(sk, skb->truesize); |
870 | } else { | |
eb934478 | 871 | mem_scheduled = sk_wmem_schedule(sk, skb->truesize); |
8e4d980a | 872 | } |
eb934478 | 873 | if (likely(mem_scheduled)) { |
8a794df6 | 874 | skb_reserve(skb, MAX_TCP_HEADER); |
a52fe46e | 875 | skb->ip_summed = CHECKSUM_PARTIAL; |
e2080072 | 876 | INIT_LIST_HEAD(&skb->tcp_tsorted_anchor); |
f561d0f2 PE |
877 | return skb; |
878 | } | |
879 | __kfree_skb(skb); | |
880 | } else { | |
5c52ba17 | 881 | sk->sk_prot->enter_memory_pressure(sk); |
f561d0f2 PE |
882 | sk_stream_moderate_sndbuf(sk); |
883 | } | |
884 | return NULL; | |
885 | } | |
886 | ||
0c54b85f IJ |
887 | static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, |
888 | int large_allowed) | |
889 | { | |
890 | struct tcp_sock *tp = tcp_sk(sk); | |
6c09fa09 | 891 | u32 new_size_goal, size_goal; |
605ad7f1 | 892 | |
74d4a8f8 | 893 | if (!large_allowed) |
605ad7f1 ED |
894 | return mss_now; |
895 | ||
6c09fa09 | 896 | /* Note : tcp_tso_autosize() will eventually split this later */ |
ab14f180 | 897 | new_size_goal = tcp_bound_to_half_wnd(tp, sk->sk_gso_max_size); |
605ad7f1 ED |
898 | |
899 | /* We try hard to avoid divides here */ | |
900 | size_goal = tp->gso_segs * mss_now; | |
901 | if (unlikely(new_size_goal < size_goal || | |
902 | new_size_goal >= size_goal + mss_now)) { | |
903 | tp->gso_segs = min_t(u16, new_size_goal / mss_now, | |
904 | sk->sk_gso_max_segs); | |
905 | size_goal = tp->gso_segs * mss_now; | |
0c54b85f IJ |
906 | } |
907 | ||
605ad7f1 | 908 | return max(size_goal, mss_now); |
0c54b85f IJ |
909 | } |
910 | ||
35b2c321 | 911 | int tcp_send_mss(struct sock *sk, int *size_goal, int flags) |
0c54b85f IJ |
912 | { |
913 | int mss_now; | |
914 | ||
915 | mss_now = tcp_current_mss(sk); | |
916 | *size_goal = tcp_xmit_size_goal(sk, mss_now, !(flags & MSG_OOB)); | |
917 | ||
918 | return mss_now; | |
919 | } | |
920 | ||
fdfc5c85 ED |
921 | /* In some cases, both sendpage() and sendmsg() could have added |
922 | * an skb to the write queue, but failed adding payload on it. | |
923 | * We need to remove it to consume less memory, but more | |
924 | * importantly be able to generate EPOLLOUT for Edge Trigger epoll() | |
925 | * users. | |
926 | */ | |
27728ba8 | 927 | void tcp_remove_empty_skb(struct sock *sk) |
fdfc5c85 | 928 | { |
27728ba8 ED |
929 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
930 | ||
cf12e6f9 | 931 | if (skb && TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq) { |
fdfc5c85 ED |
932 | tcp_unlink_write_queue(skb, sk); |
933 | if (tcp_write_queue_empty(sk)) | |
934 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
03271f3a | 935 | tcp_wmem_free_skb(sk, skb); |
fdfc5c85 ED |
936 | } |
937 | } | |
938 | ||
f8d9d938 ED |
939 | /* skb changing from pure zc to mixed, must charge zc */ |
940 | static int tcp_downgrade_zcopy_pure(struct sock *sk, struct sk_buff *skb) | |
941 | { | |
942 | if (unlikely(skb_zcopy_pure(skb))) { | |
943 | u32 extra = skb->truesize - | |
944 | SKB_TRUESIZE(skb_end_offset(skb)); | |
945 | ||
946 | if (!sk_wmem_schedule(sk, extra)) | |
947 | return -ENOMEM; | |
948 | ||
949 | sk_mem_charge(sk, extra); | |
950 | skb_shinfo(skb)->flags &= ~SKBFL_PURE_ZEROCOPY; | |
951 | } | |
952 | return 0; | |
953 | } | |
954 | ||
f54755f6 ED |
955 | |
956 | static int tcp_wmem_schedule(struct sock *sk, int copy) | |
849b425c ED |
957 | { |
958 | int left; | |
959 | ||
960 | if (likely(sk_wmem_schedule(sk, copy))) | |
961 | return copy; | |
962 | ||
963 | /* We could be in trouble if we have nothing queued. | |
964 | * Use whatever is left in sk->sk_forward_alloc and tcp_wmem[0] | |
965 | * to guarantee some progress. | |
966 | */ | |
967 | left = sock_net(sk)->ipv4.sysctl_tcp_wmem[0] - sk->sk_wmem_queued; | |
968 | if (left > 0) | |
969 | sk_forced_mem_schedule(sk, min(left, copy)); | |
970 | return min(copy, sk->sk_forward_alloc); | |
971 | } | |
972 | ||
ff6fb083 PA |
973 | static struct sk_buff *tcp_build_frag(struct sock *sk, int size_goal, int flags, |
974 | struct page *page, int offset, size_t *size) | |
b796d04b PA |
975 | { |
976 | struct sk_buff *skb = tcp_write_queue_tail(sk); | |
977 | struct tcp_sock *tp = tcp_sk(sk); | |
978 | bool can_coalesce; | |
979 | int copy, i; | |
980 | ||
981 | if (!skb || (copy = size_goal - skb->len) <= 0 || | |
982 | !tcp_skb_can_collapse_to(skb)) { | |
983 | new_segment: | |
984 | if (!sk_stream_memory_free(sk)) | |
985 | return NULL; | |
986 | ||
f8dd3b8d ED |
987 | skb = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation, |
988 | tcp_rtx_and_write_queues_empty(sk)); | |
b796d04b PA |
989 | if (!skb) |
990 | return NULL; | |
991 | ||
992 | #ifdef CONFIG_TLS_DEVICE | |
993 | skb->decrypted = !!(flags & MSG_SENDPAGE_DECRYPTED); | |
994 | #endif | |
04d8825c | 995 | tcp_skb_entail(sk, skb); |
b796d04b PA |
996 | copy = size_goal; |
997 | } | |
998 | ||
999 | if (copy > *size) | |
1000 | copy = *size; | |
1001 | ||
1002 | i = skb_shinfo(skb)->nr_frags; | |
1003 | can_coalesce = skb_can_coalesce(skb, i, page, offset); | |
657b991a | 1004 | if (!can_coalesce && i >= READ_ONCE(sysctl_max_skb_frags)) { |
b796d04b PA |
1005 | tcp_mark_push(tp, skb); |
1006 | goto new_segment; | |
1007 | } | |
849b425c ED |
1008 | if (tcp_downgrade_zcopy_pure(sk, skb)) |
1009 | return NULL; | |
1010 | ||
1011 | copy = tcp_wmem_schedule(sk, copy); | |
1012 | if (!copy) | |
b796d04b PA |
1013 | return NULL; |
1014 | ||
1015 | if (can_coalesce) { | |
1016 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1017 | } else { | |
1018 | get_page(page); | |
32614006 | 1019 | skb_fill_page_desc_noacc(skb, i, page, offset, copy); |
b796d04b PA |
1020 | } |
1021 | ||
1022 | if (!(flags & MSG_NO_SHARED_FRAGS)) | |
06b4feb3 | 1023 | skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG; |
b796d04b PA |
1024 | |
1025 | skb->len += copy; | |
1026 | skb->data_len += copy; | |
1027 | skb->truesize += copy; | |
1028 | sk_wmem_queued_add(sk, copy); | |
1029 | sk_mem_charge(sk, copy); | |
b796d04b PA |
1030 | WRITE_ONCE(tp->write_seq, tp->write_seq + copy); |
1031 | TCP_SKB_CB(skb)->end_seq += copy; | |
1032 | tcp_skb_pcount_set(skb, 0); | |
1033 | ||
1034 | *size = copy; | |
1035 | return skb; | |
1036 | } | |
1037 | ||
e3b5616a DW |
1038 | ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, |
1039 | size_t size, int flags) | |
1da177e4 LT |
1040 | { |
1041 | struct tcp_sock *tp = tcp_sk(sk); | |
c1b4a7e6 | 1042 | int mss_now, size_goal; |
1da177e4 LT |
1043 | int err; |
1044 | ssize_t copied; | |
1045 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1046 | ||
a10674bf | 1047 | if (IS_ENABLED(CONFIG_DEBUG_VM) && |
cf83a17e CL |
1048 | WARN_ONCE(!sendpage_ok(page), |
1049 | "page must not be a Slab one and have page_count > 0")) | |
a10674bf VA |
1050 | return -EINVAL; |
1051 | ||
8336886f JC |
1052 | /* Wait for a connection to finish. One exception is TCP Fast Open |
1053 | * (passive side) where data is allowed to be sent before a connection | |
1054 | * is fully established. | |
1055 | */ | |
1056 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
1057 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
1058 | err = sk_stream_wait_connect(sk, &timeo); |
1059 | if (err != 0) | |
1da177e4 | 1060 | goto out_err; |
8336886f | 1061 | } |
1da177e4 | 1062 | |
9cd3e072 | 1063 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 1064 | |
0c54b85f | 1065 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1066 | copied = 0; |
1067 | ||
1068 | err = -EPIPE; | |
1069 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
0d6a775e | 1070 | goto out_err; |
1da177e4 | 1071 | |
64022d0b | 1072 | while (size > 0) { |
b796d04b PA |
1073 | struct sk_buff *skb; |
1074 | size_t copy = size; | |
1da177e4 | 1075 | |
b796d04b PA |
1076 | skb = tcp_build_frag(sk, size_goal, flags, page, offset, ©); |
1077 | if (!skb) | |
afb83012 | 1078 | goto wait_for_space; |
e905a9ed | 1079 | |
1da177e4 | 1080 | if (!copied) |
4de075e0 | 1081 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; |
1da177e4 LT |
1082 | |
1083 | copied += copy; | |
64022d0b | 1084 | offset += copy; |
686a5624 | 1085 | size -= copy; |
ad02c4f5 | 1086 | if (!size) |
1da177e4 LT |
1087 | goto out; |
1088 | ||
69d15067 | 1089 | if (skb->len < size_goal || (flags & MSG_OOB)) |
1da177e4 LT |
1090 | continue; |
1091 | ||
1092 | if (forced_push(tp)) { | |
1093 | tcp_mark_push(tp, skb); | |
9e412ba7 | 1094 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
fe067e8a | 1095 | } else if (skb == tcp_send_head(sk)) |
1da177e4 LT |
1096 | tcp_push_one(sk, mss_now); |
1097 | continue; | |
1098 | ||
afb83012 | 1099 | wait_for_space: |
1da177e4 | 1100 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
f54b3111 ED |
1101 | tcp_push(sk, flags & ~MSG_MORE, mss_now, |
1102 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1103 | |
686a5624 YM |
1104 | err = sk_stream_wait_memory(sk, &timeo); |
1105 | if (err != 0) | |
1da177e4 LT |
1106 | goto do_error; |
1107 | ||
0c54b85f | 1108 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1109 | } |
1110 | ||
1111 | out: | |
ad02c4f5 | 1112 | if (copied) { |
4e8cc228 | 1113 | tcp_tx_timestamp(sk, sk->sk_tsflags); |
ad02c4f5 SHY |
1114 | if (!(flags & MSG_SENDPAGE_NOTLAST)) |
1115 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); | |
1116 | } | |
1da177e4 LT |
1117 | return copied; |
1118 | ||
1119 | do_error: | |
27728ba8 | 1120 | tcp_remove_empty_skb(sk); |
1da177e4 LT |
1121 | if (copied) |
1122 | goto out; | |
1123 | out_err: | |
ce5ec440 | 1124 | /* make sure we wake any epoll edge trigger waiter */ |
216808c6 | 1125 | if (unlikely(tcp_rtx_and_write_queues_empty(sk) && err == -EAGAIN)) { |
ce5ec440 | 1126 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1127 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1128 | } | |
1da177e4 LT |
1129 | return sk_stream_error(sk, flags, err); |
1130 | } | |
e3b5616a | 1131 | EXPORT_SYMBOL_GPL(do_tcp_sendpages); |
1da177e4 | 1132 | |
306b13eb TH |
1133 | int tcp_sendpage_locked(struct sock *sk, struct page *page, int offset, |
1134 | size_t size, int flags) | |
1da177e4 | 1135 | { |
dead7cdb | 1136 | if (!(sk->sk_route_caps & NETIF_F_SG)) |
bd9dfc54 | 1137 | return sock_no_sendpage_locked(sk, page, offset, size, flags); |
1da177e4 | 1138 | |
d7722e85 SHY |
1139 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1140 | ||
306b13eb TH |
1141 | return do_tcp_sendpages(sk, page, offset, size, flags); |
1142 | } | |
774c4673 | 1143 | EXPORT_SYMBOL_GPL(tcp_sendpage_locked); |
306b13eb TH |
1144 | |
1145 | int tcp_sendpage(struct sock *sk, struct page *page, int offset, | |
1146 | size_t size, int flags) | |
1147 | { | |
1148 | int ret; | |
1149 | ||
1150 | lock_sock(sk); | |
1151 | ret = tcp_sendpage_locked(sk, page, offset, size, flags); | |
1da177e4 | 1152 | release_sock(sk); |
306b13eb TH |
1153 | |
1154 | return ret; | |
1da177e4 | 1155 | } |
4bc2f18b | 1156 | EXPORT_SYMBOL(tcp_sendpage); |
1da177e4 | 1157 | |
cf60af03 YC |
1158 | void tcp_free_fastopen_req(struct tcp_sock *tp) |
1159 | { | |
00db4124 | 1160 | if (tp->fastopen_req) { |
cf60af03 YC |
1161 | kfree(tp->fastopen_req); |
1162 | tp->fastopen_req = NULL; | |
1163 | } | |
1164 | } | |
1165 | ||
3242abeb BH |
1166 | int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, int *copied, |
1167 | size_t size, struct ubuf_info *uarg) | |
cf60af03 YC |
1168 | { |
1169 | struct tcp_sock *tp = tcp_sk(sk); | |
19f6d3f3 | 1170 | struct inet_sock *inet = inet_sk(sk); |
ba615f67 | 1171 | struct sockaddr *uaddr = msg->msg_name; |
cf60af03 YC |
1172 | int err, flags; |
1173 | ||
5a542133 KI |
1174 | if (!(READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fastopen) & |
1175 | TFO_CLIENT_ENABLE) || | |
ba615f67 WW |
1176 | (uaddr && msg->msg_namelen >= sizeof(uaddr->sa_family) && |
1177 | uaddr->sa_family == AF_UNSPEC)) | |
cf60af03 | 1178 | return -EOPNOTSUPP; |
00db4124 | 1179 | if (tp->fastopen_req) |
cf60af03 YC |
1180 | return -EALREADY; /* Another Fast Open is in progress */ |
1181 | ||
1182 | tp->fastopen_req = kzalloc(sizeof(struct tcp_fastopen_request), | |
1183 | sk->sk_allocation); | |
51456b29 | 1184 | if (unlikely(!tp->fastopen_req)) |
cf60af03 YC |
1185 | return -ENOBUFS; |
1186 | tp->fastopen_req->data = msg; | |
f5ddcbbb | 1187 | tp->fastopen_req->size = size; |
f859a448 | 1188 | tp->fastopen_req->uarg = uarg; |
cf60af03 | 1189 | |
19f6d3f3 WW |
1190 | if (inet->defer_connect) { |
1191 | err = tcp_connect(sk); | |
1192 | /* Same failure procedure as in tcp_v4/6_connect */ | |
1193 | if (err) { | |
1194 | tcp_set_state(sk, TCP_CLOSE); | |
1195 | inet->inet_dport = 0; | |
1196 | sk->sk_route_caps = 0; | |
1197 | } | |
1198 | } | |
cf60af03 | 1199 | flags = (msg->msg_flags & MSG_DONTWAIT) ? O_NONBLOCK : 0; |
ba615f67 | 1200 | err = __inet_stream_connect(sk->sk_socket, uaddr, |
3979ad7e | 1201 | msg->msg_namelen, flags, 1); |
7db92362 WW |
1202 | /* fastopen_req could already be freed in __inet_stream_connect |
1203 | * if the connection times out or gets rst | |
1204 | */ | |
1205 | if (tp->fastopen_req) { | |
1206 | *copied = tp->fastopen_req->copied; | |
1207 | tcp_free_fastopen_req(tp); | |
1208 | inet->defer_connect = 0; | |
1209 | } | |
cf60af03 YC |
1210 | return err; |
1211 | } | |
1212 | ||
306b13eb | 1213 | int tcp_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t size) |
1da177e4 | 1214 | { |
1da177e4 | 1215 | struct tcp_sock *tp = tcp_sk(sk); |
f214f915 | 1216 | struct ubuf_info *uarg = NULL; |
1da177e4 | 1217 | struct sk_buff *skb; |
c14ac945 | 1218 | struct sockcm_cookie sockc; |
57be5bda AV |
1219 | int flags, err, copied = 0; |
1220 | int mss_now = 0, size_goal, copied_syn = 0; | |
1a991488 | 1221 | int process_backlog = 0; |
74d4a8f8 | 1222 | bool zc = false; |
1da177e4 LT |
1223 | long timeo; |
1224 | ||
1da177e4 | 1225 | flags = msg->msg_flags; |
f214f915 | 1226 | |
eb315a7d | 1227 | if ((flags & MSG_ZEROCOPY) && size) { |
75c119af | 1228 | skb = tcp_write_queue_tail(sk); |
f214f915 | 1229 | |
eb315a7d PB |
1230 | if (msg->msg_ubuf) { |
1231 | uarg = msg->msg_ubuf; | |
1232 | net_zcopy_get(uarg); | |
1233 | zc = sk->sk_route_caps & NETIF_F_SG; | |
1234 | } else if (sock_flag(sk, SOCK_ZEROCOPY)) { | |
1235 | uarg = msg_zerocopy_realloc(sk, size, skb_zcopy(skb)); | |
1236 | if (!uarg) { | |
1237 | err = -ENOBUFS; | |
1238 | goto out_err; | |
1239 | } | |
1240 | zc = sk->sk_route_caps & NETIF_F_SG; | |
1241 | if (!zc) | |
e7d2b510 | 1242 | uarg_to_msgzc(uarg)->zerocopy = 0; |
eb315a7d | 1243 | } |
f214f915 WB |
1244 | } |
1245 | ||
16ae6aa1 YC |
1246 | if (unlikely(flags & MSG_FASTOPEN || inet_sk(sk)->defer_connect) && |
1247 | !tp->repair) { | |
f859a448 | 1248 | err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size, uarg); |
cf60af03 YC |
1249 | if (err == -EINPROGRESS && copied_syn > 0) |
1250 | goto out; | |
1251 | else if (err) | |
1252 | goto out_err; | |
cf60af03 YC |
1253 | } |
1254 | ||
1da177e4 LT |
1255 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
1256 | ||
d7722e85 SHY |
1257 | tcp_rate_check_app_limited(sk); /* is sending application-limited? */ |
1258 | ||
8336886f JC |
1259 | /* Wait for a connection to finish. One exception is TCP Fast Open |
1260 | * (passive side) where data is allowed to be sent before a connection | |
1261 | * is fully established. | |
1262 | */ | |
1263 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && | |
1264 | !tcp_passive_fastopen(sk)) { | |
686a5624 YM |
1265 | err = sk_stream_wait_connect(sk, &timeo); |
1266 | if (err != 0) | |
cf60af03 | 1267 | goto do_error; |
8336886f | 1268 | } |
1da177e4 | 1269 | |
c0e88ff0 PE |
1270 | if (unlikely(tp->repair)) { |
1271 | if (tp->repair_queue == TCP_RECV_QUEUE) { | |
1272 | copied = tcp_send_rcvq(sk, msg, size); | |
5924f17a | 1273 | goto out_nopush; |
c0e88ff0 PE |
1274 | } |
1275 | ||
1276 | err = -EINVAL; | |
1277 | if (tp->repair_queue == TCP_NO_QUEUE) | |
1278 | goto out_err; | |
1279 | ||
1280 | /* 'common' sending to sendq */ | |
1281 | } | |
1282 | ||
657a0667 | 1283 | sockcm_init(&sockc, sk); |
c14ac945 SHY |
1284 | if (msg->msg_controllen) { |
1285 | err = sock_cmsg_send(sk, msg, &sockc); | |
1286 | if (unlikely(err)) { | |
1287 | err = -EINVAL; | |
1288 | goto out_err; | |
1289 | } | |
1290 | } | |
1291 | ||
1da177e4 | 1292 | /* This should be in poll */ |
9cd3e072 | 1293 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 | 1294 | |
1da177e4 | 1295 | /* Ok commence sending. */ |
1da177e4 LT |
1296 | copied = 0; |
1297 | ||
d41a69f1 ED |
1298 | restart: |
1299 | mss_now = tcp_send_mss(sk, &size_goal, flags); | |
1300 | ||
1da177e4 LT |
1301 | err = -EPIPE; |
1302 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) | |
79d8665b | 1303 | goto do_error; |
1da177e4 | 1304 | |
01e97e65 | 1305 | while (msg_data_left(msg)) { |
57be5bda | 1306 | int copy = 0; |
1da177e4 | 1307 | |
57be5bda | 1308 | skb = tcp_write_queue_tail(sk); |
65ec6097 ED |
1309 | if (skb) |
1310 | copy = size_goal - skb->len; | |
1da177e4 | 1311 | |
c134ecb8 | 1312 | if (copy <= 0 || !tcp_skb_can_collapse_to(skb)) { |
3613b3db ED |
1313 | bool first_skb; |
1314 | ||
1da177e4 | 1315 | new_segment: |
57be5bda | 1316 | if (!sk_stream_memory_free(sk)) |
afb83012 | 1317 | goto wait_for_space; |
1da177e4 | 1318 | |
1a991488 ED |
1319 | if (unlikely(process_backlog >= 16)) { |
1320 | process_backlog = 0; | |
1321 | if (sk_flush_backlog(sk)) | |
1322 | goto restart; | |
d4011239 | 1323 | } |
75c119af | 1324 | first_skb = tcp_rtx_and_write_queues_empty(sk); |
f8dd3b8d ED |
1325 | skb = tcp_stream_alloc_skb(sk, 0, sk->sk_allocation, |
1326 | first_skb); | |
57be5bda | 1327 | if (!skb) |
afb83012 | 1328 | goto wait_for_space; |
1da177e4 | 1329 | |
1a991488 | 1330 | process_backlog++; |
1da177e4 | 1331 | |
04d8825c | 1332 | tcp_skb_entail(sk, skb); |
57be5bda | 1333 | copy = size_goal; |
9d186cac | 1334 | |
57be5bda | 1335 | /* All packets are restored as if they have |
d3edd06e | 1336 | * already been sent. skb_mstamp_ns isn't set to |
57be5bda AV |
1337 | * avoid wrong rtt estimation. |
1338 | */ | |
1339 | if (tp->repair) | |
1340 | TCP_SKB_CB(skb)->sacked |= TCPCB_REPAIRED; | |
1341 | } | |
1da177e4 | 1342 | |
57be5bda | 1343 | /* Try to append data to the end of skb. */ |
01e97e65 AV |
1344 | if (copy > msg_data_left(msg)) |
1345 | copy = msg_data_left(msg); | |
57be5bda | 1346 | |
3ded97bc | 1347 | if (!zc) { |
57be5bda AV |
1348 | bool merge = true; |
1349 | int i = skb_shinfo(skb)->nr_frags; | |
1350 | struct page_frag *pfrag = sk_page_frag(sk); | |
1351 | ||
1352 | if (!sk_page_frag_refill(sk, pfrag)) | |
afb83012 | 1353 | goto wait_for_space; |
ef015786 | 1354 | |
57be5bda AV |
1355 | if (!skb_can_coalesce(skb, i, pfrag->page, |
1356 | pfrag->offset)) { | |
657b991a | 1357 | if (i >= READ_ONCE(sysctl_max_skb_frags)) { |
57be5bda AV |
1358 | tcp_mark_push(tp, skb); |
1359 | goto new_segment; | |
1da177e4 | 1360 | } |
57be5bda | 1361 | merge = false; |
1da177e4 LT |
1362 | } |
1363 | ||
57be5bda AV |
1364 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
1365 | ||
eb315a7d PB |
1366 | if (unlikely(skb_zcopy_pure(skb) || skb_zcopy_managed(skb))) { |
1367 | if (tcp_downgrade_zcopy_pure(sk, skb)) | |
1368 | goto wait_for_space; | |
1369 | skb_zcopy_downgrade_managed(skb); | |
1370 | } | |
849b425c ED |
1371 | |
1372 | copy = tcp_wmem_schedule(sk, copy); | |
1373 | if (!copy) | |
afb83012 | 1374 | goto wait_for_space; |
1da177e4 | 1375 | |
57be5bda AV |
1376 | err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb, |
1377 | pfrag->page, | |
1378 | pfrag->offset, | |
1379 | copy); | |
1380 | if (err) | |
1381 | goto do_error; | |
1da177e4 | 1382 | |
57be5bda AV |
1383 | /* Update the skb. */ |
1384 | if (merge) { | |
1385 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); | |
1386 | } else { | |
1387 | skb_fill_page_desc(skb, i, pfrag->page, | |
1388 | pfrag->offset, copy); | |
4e33e346 | 1389 | page_ref_inc(pfrag->page); |
4ed2d765 | 1390 | } |
57be5bda | 1391 | pfrag->offset += copy; |
f214f915 | 1392 | } else { |
9b65b17d TA |
1393 | /* First append to a fragless skb builds initial |
1394 | * pure zerocopy skb | |
1395 | */ | |
1396 | if (!skb->len) | |
1397 | skb_shinfo(skb)->flags |= SKBFL_PURE_ZEROCOPY; | |
1398 | ||
1399 | if (!skb_zcopy_pure(skb)) { | |
849b425c ED |
1400 | copy = tcp_wmem_schedule(sk, copy); |
1401 | if (!copy) | |
9b65b17d TA |
1402 | goto wait_for_space; |
1403 | } | |
358ed624 | 1404 | |
f214f915 | 1405 | err = skb_zerocopy_iter_stream(sk, skb, msg, copy, uarg); |
111856c7 WB |
1406 | if (err == -EMSGSIZE || err == -EEXIST) { |
1407 | tcp_mark_push(tp, skb); | |
f214f915 | 1408 | goto new_segment; |
111856c7 | 1409 | } |
f214f915 WB |
1410 | if (err < 0) |
1411 | goto do_error; | |
1412 | copy = err; | |
57be5bda AV |
1413 | } |
1414 | ||
1415 | if (!copied) | |
1416 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; | |
1417 | ||
0f317464 | 1418 | WRITE_ONCE(tp->write_seq, tp->write_seq + copy); |
57be5bda AV |
1419 | TCP_SKB_CB(skb)->end_seq += copy; |
1420 | tcp_skb_pcount_set(skb, 0); | |
1da177e4 | 1421 | |
57be5bda | 1422 | copied += copy; |
01e97e65 | 1423 | if (!msg_data_left(msg)) { |
c134ecb8 MKL |
1424 | if (unlikely(flags & MSG_EOR)) |
1425 | TCP_SKB_CB(skb)->eor = 1; | |
57be5bda AV |
1426 | goto out; |
1427 | } | |
1da177e4 | 1428 | |
65ec6097 | 1429 | if (skb->len < size_goal || (flags & MSG_OOB) || unlikely(tp->repair)) |
1da177e4 LT |
1430 | continue; |
1431 | ||
57be5bda AV |
1432 | if (forced_push(tp)) { |
1433 | tcp_mark_push(tp, skb); | |
1434 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); | |
1435 | } else if (skb == tcp_send_head(sk)) | |
1436 | tcp_push_one(sk, mss_now); | |
1437 | continue; | |
1438 | ||
afb83012 | 1439 | wait_for_space: |
57be5bda | 1440 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
57be5bda AV |
1441 | if (copied) |
1442 | tcp_push(sk, flags & ~MSG_MORE, mss_now, | |
1443 | TCP_NAGLE_PUSH, size_goal); | |
1da177e4 | 1444 | |
686a5624 YM |
1445 | err = sk_stream_wait_memory(sk, &timeo); |
1446 | if (err != 0) | |
57be5bda | 1447 | goto do_error; |
1da177e4 | 1448 | |
57be5bda | 1449 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
1da177e4 LT |
1450 | } |
1451 | ||
1452 | out: | |
ad02c4f5 | 1453 | if (copied) { |
4e8cc228 | 1454 | tcp_tx_timestamp(sk, sockc.tsflags); |
f54b3111 | 1455 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); |
ad02c4f5 | 1456 | } |
5924f17a | 1457 | out_nopush: |
8e044917 | 1458 | net_zcopy_put(uarg); |
cf60af03 | 1459 | return copied + copied_syn; |
1da177e4 | 1460 | |
fdfc5c85 | 1461 | do_error: |
27728ba8 | 1462 | tcp_remove_empty_skb(sk); |
1da177e4 | 1463 | |
cf60af03 | 1464 | if (copied + copied_syn) |
1da177e4 LT |
1465 | goto out; |
1466 | out_err: | |
8e044917 | 1467 | net_zcopy_put_abort(uarg, true); |
1da177e4 | 1468 | err = sk_stream_error(sk, flags, err); |
ce5ec440 | 1469 | /* make sure we wake any epoll edge trigger waiter */ |
216808c6 | 1470 | if (unlikely(tcp_rtx_and_write_queues_empty(sk) && err == -EAGAIN)) { |
ce5ec440 | 1471 | sk->sk_write_space(sk); |
b0f71bd3 FY |
1472 | tcp_chrono_stop(sk, TCP_CHRONO_SNDBUF_LIMITED); |
1473 | } | |
1da177e4 LT |
1474 | return err; |
1475 | } | |
774c4673 | 1476 | EXPORT_SYMBOL_GPL(tcp_sendmsg_locked); |
306b13eb TH |
1477 | |
1478 | int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) | |
1479 | { | |
1480 | int ret; | |
1481 | ||
1482 | lock_sock(sk); | |
1483 | ret = tcp_sendmsg_locked(sk, msg, size); | |
1484 | release_sock(sk); | |
1485 | ||
1486 | return ret; | |
1487 | } | |
4bc2f18b | 1488 | EXPORT_SYMBOL(tcp_sendmsg); |
1da177e4 LT |
1489 | |
1490 | /* | |
1491 | * Handle reading urgent data. BSD has very simple semantics for | |
1492 | * this, no blocking and very strange errors 8) | |
1493 | */ | |
1494 | ||
377f0a08 | 1495 | static int tcp_recv_urg(struct sock *sk, struct msghdr *msg, int len, int flags) |
1da177e4 LT |
1496 | { |
1497 | struct tcp_sock *tp = tcp_sk(sk); | |
1498 | ||
1499 | /* No URG data to read. */ | |
1500 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || | |
1501 | tp->urg_data == TCP_URG_READ) | |
1502 | return -EINVAL; /* Yes this is right ! */ | |
1503 | ||
1504 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) | |
1505 | return -ENOTCONN; | |
1506 | ||
1507 | if (tp->urg_data & TCP_URG_VALID) { | |
1508 | int err = 0; | |
1509 | char c = tp->urg_data; | |
1510 | ||
1511 | if (!(flags & MSG_PEEK)) | |
7b6a893a | 1512 | WRITE_ONCE(tp->urg_data, TCP_URG_READ); |
1da177e4 LT |
1513 | |
1514 | /* Read urgent data. */ | |
1515 | msg->msg_flags |= MSG_OOB; | |
1516 | ||
1517 | if (len > 0) { | |
1518 | if (!(flags & MSG_TRUNC)) | |
7eab8d9e | 1519 | err = memcpy_to_msg(msg, &c, 1); |
1da177e4 LT |
1520 | len = 1; |
1521 | } else | |
1522 | msg->msg_flags |= MSG_TRUNC; | |
1523 | ||
1524 | return err ? -EFAULT : len; | |
1525 | } | |
1526 | ||
1527 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1528 | return 0; | |
1529 | ||
1530 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and | |
1531 | * the available implementations agree in this case: | |
1532 | * this call should never block, independent of the | |
1533 | * blocking state of the socket. | |
1534 | * Mike <pall@rz.uni-karlsruhe.de> | |
1535 | */ | |
1536 | return -EAGAIN; | |
1537 | } | |
1538 | ||
c0e88ff0 PE |
1539 | static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len) |
1540 | { | |
1541 | struct sk_buff *skb; | |
1542 | int copied = 0, err = 0; | |
1543 | ||
1544 | /* XXX -- need to support SO_PEEK_OFF */ | |
1545 | ||
75c119af ED |
1546 | skb_rbtree_walk(skb, &sk->tcp_rtx_queue) { |
1547 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); | |
1548 | if (err) | |
1549 | return err; | |
1550 | copied += skb->len; | |
1551 | } | |
1552 | ||
c0e88ff0 | 1553 | skb_queue_walk(&sk->sk_write_queue, skb) { |
51f3d02b | 1554 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); |
c0e88ff0 PE |
1555 | if (err) |
1556 | break; | |
1557 | ||
1558 | copied += skb->len; | |
1559 | } | |
1560 | ||
1561 | return err ?: copied; | |
1562 | } | |
1563 | ||
1da177e4 LT |
1564 | /* Clean up the receive buffer for full frames taken by the user, |
1565 | * then send an ACK if necessary. COPIED is the number of bytes | |
1566 | * tcp_recvmsg has given to the user so far, it speeds up the | |
1567 | * calculation of whether or not we must ACK for the sake of | |
1568 | * a window update. | |
1569 | */ | |
c457985a | 1570 | static void __tcp_cleanup_rbuf(struct sock *sk, int copied) |
1da177e4 LT |
1571 | { |
1572 | struct tcp_sock *tp = tcp_sk(sk); | |
a2a385d6 | 1573 | bool time_to_ack = false; |
1da177e4 | 1574 | |
463c84b9 ACM |
1575 | if (inet_csk_ack_scheduled(sk)) { |
1576 | const struct inet_connection_sock *icsk = inet_csk(sk); | |
b6b6d653 ED |
1577 | |
1578 | if (/* Once-per-two-segments ACK was not sent by tcp_input.c */ | |
463c84b9 | 1579 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
1da177e4 LT |
1580 | /* |
1581 | * If this read emptied read buffer, we send ACK, if | |
1582 | * connection is not bidirectional, user drained | |
1583 | * receive buffer and there was a small segment | |
1584 | * in queue. | |
1585 | */ | |
1ef9696c AK |
1586 | (copied > 0 && |
1587 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) || | |
1588 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && | |
31954cd8 | 1589 | !inet_csk_in_pingpong_mode(sk))) && |
1ef9696c | 1590 | !atomic_read(&sk->sk_rmem_alloc))) |
a2a385d6 | 1591 | time_to_ack = true; |
1da177e4 LT |
1592 | } |
1593 | ||
1594 | /* We send an ACK if we can now advertise a non-zero window | |
1595 | * which has been raised "significantly". | |
1596 | * | |
1597 | * Even if window raised up to infinity, do not send window open ACK | |
1598 | * in states, where we will not receive more. It is useless. | |
1599 | */ | |
1600 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { | |
1601 | __u32 rcv_window_now = tcp_receive_window(tp); | |
1602 | ||
1603 | /* Optimize, __tcp_select_window() is not cheap. */ | |
1604 | if (2*rcv_window_now <= tp->window_clamp) { | |
1605 | __u32 new_window = __tcp_select_window(sk); | |
1606 | ||
1607 | /* Send ACK now, if this read freed lots of space | |
1608 | * in our buffer. Certainly, new_window is new window. | |
1609 | * We can advertise it now, if it is not less than current one. | |
1610 | * "Lots" means "at least twice" here. | |
1611 | */ | |
1612 | if (new_window && new_window >= 2 * rcv_window_now) | |
a2a385d6 | 1613 | time_to_ack = true; |
1da177e4 LT |
1614 | } |
1615 | } | |
1616 | if (time_to_ack) | |
1617 | tcp_send_ack(sk); | |
1618 | } | |
1619 | ||
c457985a CW |
1620 | void tcp_cleanup_rbuf(struct sock *sk, int copied) |
1621 | { | |
1622 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); | |
1623 | struct tcp_sock *tp = tcp_sk(sk); | |
1624 | ||
1625 | WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq), | |
1626 | "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n", | |
1627 | tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt); | |
1628 | __tcp_cleanup_rbuf(sk, copied); | |
1629 | } | |
1630 | ||
3df684c1 ED |
1631 | static void tcp_eat_recv_skb(struct sock *sk, struct sk_buff *skb) |
1632 | { | |
f35f8219 | 1633 | __skb_unlink(skb, &sk->sk_receive_queue); |
3df684c1 ED |
1634 | if (likely(skb->destructor == sock_rfree)) { |
1635 | sock_rfree(skb); | |
1636 | skb->destructor = NULL; | |
1637 | skb->sk = NULL; | |
68822bdf | 1638 | return skb_attempt_defer_free(skb); |
3df684c1 | 1639 | } |
f35f8219 | 1640 | __kfree_skb(skb); |
3df684c1 ED |
1641 | } |
1642 | ||
3f92a64e | 1643 | struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
1da177e4 LT |
1644 | { |
1645 | struct sk_buff *skb; | |
1646 | u32 offset; | |
1647 | ||
f26845b4 | 1648 | while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) { |
1da177e4 | 1649 | offset = seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
1650 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
1651 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 1652 | offset--; |
9d691539 | 1653 | } |
e11ecddf | 1654 | if (offset < skb->len || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) { |
1da177e4 LT |
1655 | *off = offset; |
1656 | return skb; | |
1657 | } | |
f26845b4 ED |
1658 | /* This looks weird, but this can happen if TCP collapsing |
1659 | * splitted a fat GRO packet, while we released socket lock | |
1660 | * in skb_splice_bits() | |
1661 | */ | |
3df684c1 | 1662 | tcp_eat_recv_skb(sk, skb); |
1da177e4 LT |
1663 | } |
1664 | return NULL; | |
1665 | } | |
3f92a64e | 1666 | EXPORT_SYMBOL(tcp_recv_skb); |
1da177e4 LT |
1667 | |
1668 | /* | |
1669 | * This routine provides an alternative to tcp_recvmsg() for routines | |
1670 | * that would like to handle copying from skbuffs directly in 'sendfile' | |
1671 | * fashion. | |
1672 | * Note: | |
1673 | * - It is assumed that the socket was locked by the caller. | |
1674 | * - The routine does not block. | |
1675 | * - At present, there is no support for reading OOB data | |
1676 | * or for 'peeking' the socket using this routine | |
1677 | * (although both would be easy to implement). | |
1678 | */ | |
1679 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, | |
1680 | sk_read_actor_t recv_actor) | |
1681 | { | |
1682 | struct sk_buff *skb; | |
1683 | struct tcp_sock *tp = tcp_sk(sk); | |
1684 | u32 seq = tp->copied_seq; | |
1685 | u32 offset; | |
1686 | int copied = 0; | |
1687 | ||
1688 | if (sk->sk_state == TCP_LISTEN) | |
1689 | return -ENOTCONN; | |
1690 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { | |
1691 | if (offset < skb->len) { | |
374e7b59 OP |
1692 | int used; |
1693 | size_t len; | |
1da177e4 LT |
1694 | |
1695 | len = skb->len - offset; | |
1696 | /* Stop reading if we hit a patch of urgent data */ | |
b96c51bd | 1697 | if (unlikely(tp->urg_data)) { |
1da177e4 LT |
1698 | u32 urg_offset = tp->urg_seq - seq; |
1699 | if (urg_offset < len) | |
1700 | len = urg_offset; | |
1701 | if (!len) | |
1702 | break; | |
1703 | } | |
1704 | used = recv_actor(desc, skb, offset, len); | |
ff905b1e | 1705 | if (used <= 0) { |
ddb61a57 JA |
1706 | if (!copied) |
1707 | copied = used; | |
1708 | break; | |
1da177e4 | 1709 | } |
e3d5ea2c ED |
1710 | if (WARN_ON_ONCE(used > len)) |
1711 | used = len; | |
1712 | seq += used; | |
1713 | copied += used; | |
1714 | offset += used; | |
1715 | ||
02275a2e | 1716 | /* If recv_actor drops the lock (e.g. TCP splice |
293ad604 OP |
1717 | * receive) the skb pointer might be invalid when |
1718 | * getting here: tcp_collapse might have deleted it | |
1719 | * while aggregating skbs from the socket queue. | |
1720 | */ | |
02275a2e WT |
1721 | skb = tcp_recv_skb(sk, seq - 1, &offset); |
1722 | if (!skb) | |
1da177e4 | 1723 | break; |
02275a2e WT |
1724 | /* TCP coalescing might have appended data to the skb. |
1725 | * Try to splice more frags | |
1726 | */ | |
1727 | if (offset + 1 != skb->len) | |
1728 | continue; | |
1da177e4 | 1729 | } |
e11ecddf | 1730 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) { |
3df684c1 | 1731 | tcp_eat_recv_skb(sk, skb); |
1da177e4 LT |
1732 | ++seq; |
1733 | break; | |
1734 | } | |
3df684c1 | 1735 | tcp_eat_recv_skb(sk, skb); |
1da177e4 LT |
1736 | if (!desc->count) |
1737 | break; | |
7db48e98 | 1738 | WRITE_ONCE(tp->copied_seq, seq); |
1da177e4 | 1739 | } |
7db48e98 | 1740 | WRITE_ONCE(tp->copied_seq, seq); |
1da177e4 LT |
1741 | |
1742 | tcp_rcv_space_adjust(sk); | |
1743 | ||
1744 | /* Clean up data we have read: This will do ACK frames. */ | |
f26845b4 ED |
1745 | if (copied > 0) { |
1746 | tcp_recv_skb(sk, seq, &offset); | |
0e4b4992 | 1747 | tcp_cleanup_rbuf(sk, copied); |
f26845b4 | 1748 | } |
1da177e4 LT |
1749 | return copied; |
1750 | } | |
4bc2f18b | 1751 | EXPORT_SYMBOL(tcp_read_sock); |
1da177e4 | 1752 | |
965b57b4 | 1753 | int tcp_read_skb(struct sock *sk, skb_read_actor_t recv_actor) |
04919bed CW |
1754 | { |
1755 | struct tcp_sock *tp = tcp_sk(sk); | |
1756 | u32 seq = tp->copied_seq; | |
1757 | struct sk_buff *skb; | |
1758 | int copied = 0; | |
1759 | u32 offset; | |
1760 | ||
1761 | if (sk->sk_state == TCP_LISTEN) | |
1762 | return -ENOTCONN; | |
1763 | ||
db4192a7 CW |
1764 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { |
1765 | u8 tcp_flags; | |
1766 | int used; | |
04919bed | 1767 | |
db4192a7 CW |
1768 | __skb_unlink(skb, &sk->sk_receive_queue); |
1769 | WARN_ON_ONCE(!skb_set_owner_sk_safe(skb, sk)); | |
1770 | tcp_flags = TCP_SKB_CB(skb)->tcp_flags; | |
1771 | used = recv_actor(sk, skb); | |
1772 | consume_skb(skb); | |
1773 | if (used < 0) { | |
1774 | if (!copied) | |
1775 | copied = used; | |
1776 | break; | |
1777 | } | |
1778 | seq += used; | |
1779 | copied += used; | |
04919bed | 1780 | |
db4192a7 | 1781 | if (tcp_flags & TCPHDR_FIN) { |
04919bed | 1782 | ++seq; |
db4192a7 CW |
1783 | break; |
1784 | } | |
04919bed CW |
1785 | } |
1786 | WRITE_ONCE(tp->copied_seq, seq); | |
1787 | ||
1788 | tcp_rcv_space_adjust(sk); | |
1789 | ||
1790 | /* Clean up data we have read: This will do ACK frames. */ | |
1791 | if (copied > 0) | |
c457985a | 1792 | __tcp_cleanup_rbuf(sk, copied); |
04919bed CW |
1793 | |
1794 | return copied; | |
1795 | } | |
1796 | EXPORT_SYMBOL(tcp_read_skb); | |
1797 | ||
3f92a64e JK |
1798 | void tcp_read_done(struct sock *sk, size_t len) |
1799 | { | |
1800 | struct tcp_sock *tp = tcp_sk(sk); | |
1801 | u32 seq = tp->copied_seq; | |
1802 | struct sk_buff *skb; | |
1803 | size_t left; | |
1804 | u32 offset; | |
1805 | ||
1806 | if (sk->sk_state == TCP_LISTEN) | |
1807 | return; | |
1808 | ||
1809 | left = len; | |
1810 | while (left && (skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { | |
1811 | int used; | |
1812 | ||
1813 | used = min_t(size_t, skb->len - offset, left); | |
1814 | seq += used; | |
1815 | left -= used; | |
1816 | ||
1817 | if (skb->len > offset + used) | |
1818 | break; | |
1819 | ||
1820 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) { | |
1821 | tcp_eat_recv_skb(sk, skb); | |
1822 | ++seq; | |
1823 | break; | |
1824 | } | |
1825 | tcp_eat_recv_skb(sk, skb); | |
1826 | } | |
1827 | WRITE_ONCE(tp->copied_seq, seq); | |
1828 | ||
1829 | tcp_rcv_space_adjust(sk); | |
1830 | ||
1831 | /* Clean up data we have read: This will do ACK frames. */ | |
1832 | if (left != len) | |
1833 | tcp_cleanup_rbuf(sk, len - left); | |
1834 | } | |
1835 | EXPORT_SYMBOL(tcp_read_done); | |
1836 | ||
32035585 TH |
1837 | int tcp_peek_len(struct socket *sock) |
1838 | { | |
1839 | return tcp_inq(sock->sk); | |
1840 | } | |
1841 | EXPORT_SYMBOL(tcp_peek_len); | |
1842 | ||
d1361840 ED |
1843 | /* Make sure sk_rcvbuf is big enough to satisfy SO_RCVLOWAT hint */ |
1844 | int tcp_set_rcvlowat(struct sock *sk, int val) | |
1845 | { | |
867f816b SHY |
1846 | int cap; |
1847 | ||
1848 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) | |
1849 | cap = sk->sk_rcvbuf >> 1; | |
1850 | else | |
02739545 | 1851 | cap = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]) >> 1; |
867f816b | 1852 | val = min(val, cap); |
eac66402 | 1853 | WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
03f45c88 ED |
1854 | |
1855 | /* Check if we need to signal EPOLLIN right now */ | |
1856 | tcp_data_ready(sk); | |
1857 | ||
d1361840 ED |
1858 | if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) |
1859 | return 0; | |
1860 | ||
d1361840 | 1861 | val <<= 1; |
d1361840 | 1862 | if (val > sk->sk_rcvbuf) { |
ebb3b78d | 1863 | WRITE_ONCE(sk->sk_rcvbuf, val); |
d1361840 ED |
1864 | tcp_sk(sk)->window_clamp = tcp_win_from_space(sk, val); |
1865 | } | |
1866 | return 0; | |
1867 | } | |
1868 | EXPORT_SYMBOL(tcp_set_rcvlowat); | |
1869 | ||
892bfd3d FW |
1870 | void tcp_update_recv_tstamps(struct sk_buff *skb, |
1871 | struct scm_timestamping_internal *tss) | |
7eeba170 AR |
1872 | { |
1873 | if (skb->tstamp) | |
1874 | tss->ts[0] = ktime_to_timespec64(skb->tstamp); | |
1875 | else | |
1876 | tss->ts[0] = (struct timespec64) {0}; | |
1877 | ||
1878 | if (skb_hwtstamps(skb)->hwtstamp) | |
1879 | tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp); | |
1880 | else | |
1881 | tss->ts[2] = (struct timespec64) {0}; | |
1882 | } | |
1883 | ||
05255b82 ED |
1884 | #ifdef CONFIG_MMU |
1885 | static const struct vm_operations_struct tcp_vm_ops = { | |
1886 | }; | |
1887 | ||
93ab6cc6 ED |
1888 | int tcp_mmap(struct file *file, struct socket *sock, |
1889 | struct vm_area_struct *vma) | |
1890 | { | |
05255b82 ED |
1891 | if (vma->vm_flags & (VM_WRITE | VM_EXEC)) |
1892 | return -EPERM; | |
1893 | vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC); | |
1894 | ||
3e4e28c5 | 1895 | /* Instruct vm_insert_page() to not mmap_read_lock(mm) */ |
05255b82 ED |
1896 | vma->vm_flags |= VM_MIXEDMAP; |
1897 | ||
1898 | vma->vm_ops = &tcp_vm_ops; | |
1899 | return 0; | |
1900 | } | |
1901 | EXPORT_SYMBOL(tcp_mmap); | |
1902 | ||
7fba5309 AR |
1903 | static skb_frag_t *skb_advance_to_frag(struct sk_buff *skb, u32 offset_skb, |
1904 | u32 *offset_frag) | |
1905 | { | |
1906 | skb_frag_t *frag; | |
1907 | ||
70701b83 AR |
1908 | if (unlikely(offset_skb >= skb->len)) |
1909 | return NULL; | |
1910 | ||
7fba5309 AR |
1911 | offset_skb -= skb_headlen(skb); |
1912 | if ((int)offset_skb < 0 || skb_has_frag_list(skb)) | |
1913 | return NULL; | |
1914 | ||
1915 | frag = skb_shinfo(skb)->frags; | |
1916 | while (offset_skb) { | |
1917 | if (skb_frag_size(frag) > offset_skb) { | |
1918 | *offset_frag = offset_skb; | |
1919 | return frag; | |
1920 | } | |
1921 | offset_skb -= skb_frag_size(frag); | |
1922 | ++frag; | |
1923 | } | |
1924 | *offset_frag = 0; | |
1925 | return frag; | |
1926 | } | |
1927 | ||
98917cf0 AR |
1928 | static bool can_map_frag(const skb_frag_t *frag) |
1929 | { | |
1930 | return skb_frag_size(frag) == PAGE_SIZE && !skb_frag_off(frag); | |
1931 | } | |
1932 | ||
1933 | static int find_next_mappable_frag(const skb_frag_t *frag, | |
1934 | int remaining_in_skb) | |
1935 | { | |
1936 | int offset = 0; | |
1937 | ||
1938 | if (likely(can_map_frag(frag))) | |
1939 | return 0; | |
1940 | ||
1941 | while (offset < remaining_in_skb && !can_map_frag(frag)) { | |
1942 | offset += skb_frag_size(frag); | |
1943 | ++frag; | |
1944 | } | |
1945 | return offset; | |
1946 | } | |
1947 | ||
0c3936d3 AR |
1948 | static void tcp_zerocopy_set_hint_for_skb(struct sock *sk, |
1949 | struct tcp_zerocopy_receive *zc, | |
1950 | struct sk_buff *skb, u32 offset) | |
1951 | { | |
1952 | u32 frag_offset, partial_frag_remainder = 0; | |
1953 | int mappable_offset; | |
1954 | skb_frag_t *frag; | |
1955 | ||
1956 | /* worst case: skip to next skb. try to improve on this case below */ | |
1957 | zc->recv_skip_hint = skb->len - offset; | |
1958 | ||
1959 | /* Find the frag containing this offset (and how far into that frag) */ | |
1960 | frag = skb_advance_to_frag(skb, offset, &frag_offset); | |
1961 | if (!frag) | |
1962 | return; | |
1963 | ||
1964 | if (frag_offset) { | |
1965 | struct skb_shared_info *info = skb_shinfo(skb); | |
1966 | ||
1967 | /* We read part of the last frag, must recvmsg() rest of skb. */ | |
1968 | if (frag == &info->frags[info->nr_frags - 1]) | |
1969 | return; | |
1970 | ||
1971 | /* Else, we must at least read the remainder in this frag. */ | |
1972 | partial_frag_remainder = skb_frag_size(frag) - frag_offset; | |
1973 | zc->recv_skip_hint -= partial_frag_remainder; | |
1974 | ++frag; | |
1975 | } | |
1976 | ||
1977 | /* partial_frag_remainder: If part way through a frag, must read rest. | |
1978 | * mappable_offset: Bytes till next mappable frag, *not* counting bytes | |
1979 | * in partial_frag_remainder. | |
1980 | */ | |
1981 | mappable_offset = find_next_mappable_frag(frag, zc->recv_skip_hint); | |
1982 | zc->recv_skip_hint = mappable_offset + partial_frag_remainder; | |
1983 | } | |
1984 | ||
f21a3c48 | 1985 | static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len, |
ec095263 | 1986 | int flags, struct scm_timestamping_internal *tss, |
f21a3c48 AR |
1987 | int *cmsg_flags); |
1988 | static int receive_fallback_to_copy(struct sock *sk, | |
7eeba170 AR |
1989 | struct tcp_zerocopy_receive *zc, int inq, |
1990 | struct scm_timestamping_internal *tss) | |
f21a3c48 AR |
1991 | { |
1992 | unsigned long copy_address = (unsigned long)zc->copybuf_address; | |
f21a3c48 AR |
1993 | struct msghdr msg = {}; |
1994 | struct iovec iov; | |
7eeba170 | 1995 | int err; |
f21a3c48 AR |
1996 | |
1997 | zc->length = 0; | |
1998 | zc->recv_skip_hint = 0; | |
1999 | ||
2000 | if (copy_address != zc->copybuf_address) | |
2001 | return -EINVAL; | |
2002 | ||
de4eda9d | 2003 | err = import_single_range(ITER_DEST, (void __user *)copy_address, |
f21a3c48 AR |
2004 | inq, &iov, &msg.msg_iter); |
2005 | if (err) | |
2006 | return err; | |
2007 | ||
ec095263 | 2008 | err = tcp_recvmsg_locked(sk, &msg, inq, MSG_DONTWAIT, |
7eeba170 | 2009 | tss, &zc->msg_flags); |
f21a3c48 AR |
2010 | if (err < 0) |
2011 | return err; | |
2012 | ||
2013 | zc->copybuf_len = err; | |
0c3936d3 AR |
2014 | if (likely(zc->copybuf_len)) { |
2015 | struct sk_buff *skb; | |
2016 | u32 offset; | |
2017 | ||
2018 | skb = tcp_recv_skb(sk, tcp_sk(sk)->copied_seq, &offset); | |
2019 | if (skb) | |
2020 | tcp_zerocopy_set_hint_for_skb(sk, zc, skb, offset); | |
2021 | } | |
f21a3c48 AR |
2022 | return 0; |
2023 | } | |
2024 | ||
18fb76ed AR |
2025 | static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc, |
2026 | struct sk_buff *skb, u32 copylen, | |
2027 | u32 *offset, u32 *seq) | |
2028 | { | |
2029 | unsigned long copy_address = (unsigned long)zc->copybuf_address; | |
2030 | struct msghdr msg = {}; | |
2031 | struct iovec iov; | |
2032 | int err; | |
2033 | ||
2034 | if (copy_address != zc->copybuf_address) | |
2035 | return -EINVAL; | |
2036 | ||
de4eda9d | 2037 | err = import_single_range(ITER_DEST, (void __user *)copy_address, |
18fb76ed AR |
2038 | copylen, &iov, &msg.msg_iter); |
2039 | if (err) | |
2040 | return err; | |
2041 | err = skb_copy_datagram_msg(skb, *offset, &msg, copylen); | |
2042 | if (err) | |
2043 | return err; | |
2044 | zc->recv_skip_hint -= copylen; | |
2045 | *offset += copylen; | |
2046 | *seq += copylen; | |
2047 | return (__s32)copylen; | |
2048 | } | |
2049 | ||
7eeba170 AR |
2050 | static int tcp_zc_handle_leftover(struct tcp_zerocopy_receive *zc, |
2051 | struct sock *sk, | |
2052 | struct sk_buff *skb, | |
2053 | u32 *seq, | |
2054 | s32 copybuf_len, | |
2055 | struct scm_timestamping_internal *tss) | |
18fb76ed AR |
2056 | { |
2057 | u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint); | |
2058 | ||
2059 | if (!copylen) | |
2060 | return 0; | |
2061 | /* skb is null if inq < PAGE_SIZE. */ | |
7eeba170 | 2062 | if (skb) { |
18fb76ed | 2063 | offset = *seq - TCP_SKB_CB(skb)->seq; |
7eeba170 | 2064 | } else { |
18fb76ed | 2065 | skb = tcp_recv_skb(sk, *seq, &offset); |
7eeba170 AR |
2066 | if (TCP_SKB_CB(skb)->has_rxtstamp) { |
2067 | tcp_update_recv_tstamps(skb, tss); | |
2068 | zc->msg_flags |= TCP_CMSG_TS; | |
2069 | } | |
2070 | } | |
18fb76ed AR |
2071 | |
2072 | zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset, | |
2073 | seq); | |
2074 | return zc->copybuf_len < 0 ? 0 : copylen; | |
2075 | } | |
2076 | ||
94ab9eb9 AR |
2077 | static int tcp_zerocopy_vm_insert_batch_error(struct vm_area_struct *vma, |
2078 | struct page **pending_pages, | |
2079 | unsigned long pages_remaining, | |
2080 | unsigned long *address, | |
2081 | u32 *length, | |
2082 | u32 *seq, | |
2083 | struct tcp_zerocopy_receive *zc, | |
2084 | u32 total_bytes_to_map, | |
2085 | int err) | |
2086 | { | |
2087 | /* At least one page did not map. Try zapping if we skipped earlier. */ | |
2088 | if (err == -EBUSY && | |
2089 | zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT) { | |
2090 | u32 maybe_zap_len; | |
2091 | ||
2092 | maybe_zap_len = total_bytes_to_map - /* All bytes to map */ | |
2093 | *length + /* Mapped or pending */ | |
2094 | (pages_remaining * PAGE_SIZE); /* Failed map. */ | |
2095 | zap_page_range(vma, *address, maybe_zap_len); | |
2096 | err = 0; | |
2097 | } | |
2098 | ||
2099 | if (!err) { | |
2100 | unsigned long leftover_pages = pages_remaining; | |
2101 | int bytes_mapped; | |
2102 | ||
2103 | /* We called zap_page_range, try to reinsert. */ | |
2104 | err = vm_insert_pages(vma, *address, | |
2105 | pending_pages, | |
2106 | &pages_remaining); | |
2107 | bytes_mapped = PAGE_SIZE * (leftover_pages - pages_remaining); | |
2108 | *seq += bytes_mapped; | |
2109 | *address += bytes_mapped; | |
2110 | } | |
2111 | if (err) { | |
2112 | /* Either we were unable to zap, OR we zapped, retried an | |
2113 | * insert, and still had an issue. Either ways, pages_remaining | |
2114 | * is the number of pages we were unable to map, and we unroll | |
2115 | * some state we speculatively touched before. | |
2116 | */ | |
2117 | const int bytes_not_mapped = PAGE_SIZE * pages_remaining; | |
2118 | ||
2119 | *length -= bytes_not_mapped; | |
2120 | zc->recv_skip_hint += bytes_not_mapped; | |
2121 | } | |
2122 | return err; | |
2123 | } | |
2124 | ||
3763a24c AR |
2125 | static int tcp_zerocopy_vm_insert_batch(struct vm_area_struct *vma, |
2126 | struct page **pages, | |
94ab9eb9 AR |
2127 | unsigned int pages_to_map, |
2128 | unsigned long *address, | |
2129 | u32 *length, | |
3763a24c | 2130 | u32 *seq, |
94ab9eb9 AR |
2131 | struct tcp_zerocopy_receive *zc, |
2132 | u32 total_bytes_to_map) | |
3763a24c AR |
2133 | { |
2134 | unsigned long pages_remaining = pages_to_map; | |
94ab9eb9 AR |
2135 | unsigned int pages_mapped; |
2136 | unsigned int bytes_mapped; | |
2137 | int err; | |
3763a24c | 2138 | |
94ab9eb9 AR |
2139 | err = vm_insert_pages(vma, *address, pages, &pages_remaining); |
2140 | pages_mapped = pages_to_map - (unsigned int)pages_remaining; | |
2141 | bytes_mapped = PAGE_SIZE * pages_mapped; | |
3763a24c AR |
2142 | /* Even if vm_insert_pages fails, it may have partially succeeded in |
2143 | * mapping (some but not all of the pages). | |
2144 | */ | |
2145 | *seq += bytes_mapped; | |
94ab9eb9 AR |
2146 | *address += bytes_mapped; |
2147 | ||
2148 | if (likely(!err)) | |
2149 | return 0; | |
2150 | ||
2151 | /* Error: maybe zap and retry + rollback state for failed inserts. */ | |
2152 | return tcp_zerocopy_vm_insert_batch_error(vma, pages + pages_mapped, | |
2153 | pages_remaining, address, length, seq, zc, total_bytes_to_map, | |
2154 | err); | |
3763a24c AR |
2155 | } |
2156 | ||
3c5a2fd0 | 2157 | #define TCP_VALID_ZC_MSG_FLAGS (TCP_CMSG_TS) |
7eeba170 AR |
2158 | static void tcp_zc_finalize_rx_tstamp(struct sock *sk, |
2159 | struct tcp_zerocopy_receive *zc, | |
2160 | struct scm_timestamping_internal *tss) | |
2161 | { | |
2162 | unsigned long msg_control_addr; | |
2163 | struct msghdr cmsg_dummy; | |
2164 | ||
2165 | msg_control_addr = (unsigned long)zc->msg_control; | |
2166 | cmsg_dummy.msg_control = (void *)msg_control_addr; | |
2167 | cmsg_dummy.msg_controllen = | |
2168 | (__kernel_size_t)zc->msg_controllen; | |
2169 | cmsg_dummy.msg_flags = in_compat_syscall() | |
2170 | ? MSG_CMSG_COMPAT : 0; | |
a6f8ee58 | 2171 | cmsg_dummy.msg_control_is_user = true; |
7eeba170 AR |
2172 | zc->msg_flags = 0; |
2173 | if (zc->msg_control == msg_control_addr && | |
2174 | zc->msg_controllen == cmsg_dummy.msg_controllen) { | |
2175 | tcp_recv_timestamp(&cmsg_dummy, sk, tss); | |
2176 | zc->msg_control = (__u64) | |
2177 | ((uintptr_t)cmsg_dummy.msg_control); | |
2178 | zc->msg_controllen = | |
2179 | (__u64)cmsg_dummy.msg_controllen; | |
2180 | zc->msg_flags = (__u32)cmsg_dummy.msg_flags; | |
2181 | } | |
2182 | } | |
2183 | ||
94ab9eb9 | 2184 | #define TCP_ZEROCOPY_PAGE_BATCH_SIZE 32 |
05255b82 | 2185 | static int tcp_zerocopy_receive(struct sock *sk, |
7eeba170 AR |
2186 | struct tcp_zerocopy_receive *zc, |
2187 | struct scm_timestamping_internal *tss) | |
05255b82 | 2188 | { |
94ab9eb9 | 2189 | u32 length = 0, offset, vma_len, avail_len, copylen = 0; |
05255b82 | 2190 | unsigned long address = (unsigned long)zc->address; |
94ab9eb9 | 2191 | struct page *pages[TCP_ZEROCOPY_PAGE_BATCH_SIZE]; |
18fb76ed AR |
2192 | s32 copybuf_len = zc->copybuf_len; |
2193 | struct tcp_sock *tp = tcp_sk(sk); | |
05255b82 | 2194 | const skb_frag_t *frags = NULL; |
94ab9eb9 | 2195 | unsigned int pages_to_map = 0; |
05255b82 ED |
2196 | struct vm_area_struct *vma; |
2197 | struct sk_buff *skb = NULL; | |
18fb76ed | 2198 | u32 seq = tp->copied_seq; |
94ab9eb9 | 2199 | u32 total_bytes_to_map; |
18fb76ed | 2200 | int inq = tcp_inq(sk); |
93ab6cc6 ED |
2201 | int ret; |
2202 | ||
18fb76ed | 2203 | zc->copybuf_len = 0; |
7eeba170 | 2204 | zc->msg_flags = 0; |
18fb76ed | 2205 | |
05255b82 | 2206 | if (address & (PAGE_SIZE - 1) || address != zc->address) |
93ab6cc6 ED |
2207 | return -EINVAL; |
2208 | ||
93ab6cc6 | 2209 | if (sk->sk_state == TCP_LISTEN) |
05255b82 | 2210 | return -ENOTCONN; |
93ab6cc6 ED |
2211 | |
2212 | sock_rps_record_flow(sk); | |
2213 | ||
f21a3c48 | 2214 | if (inq && inq <= copybuf_len) |
7eeba170 | 2215 | return receive_fallback_to_copy(sk, zc, inq, tss); |
f21a3c48 | 2216 | |
936ced41 AR |
2217 | if (inq < PAGE_SIZE) { |
2218 | zc->length = 0; | |
2219 | zc->recv_skip_hint = inq; | |
2220 | if (!inq && sock_flag(sk, SOCK_DONE)) | |
2221 | return -EIO; | |
2222 | return 0; | |
2223 | } | |
2224 | ||
d8ed45c5 | 2225 | mmap_read_lock(current->mm); |
05255b82 | 2226 | |
47bdd1db LH |
2227 | vma = vma_lookup(current->mm, address); |
2228 | if (!vma || vma->vm_ops != &tcp_vm_ops) { | |
d8ed45c5 | 2229 | mmap_read_unlock(current->mm); |
e776af60 ED |
2230 | return -EINVAL; |
2231 | } | |
18fb76ed AR |
2232 | vma_len = min_t(unsigned long, zc->length, vma->vm_end - address); |
2233 | avail_len = min_t(u32, vma_len, inq); | |
94ab9eb9 AR |
2234 | total_bytes_to_map = avail_len & ~(PAGE_SIZE - 1); |
2235 | if (total_bytes_to_map) { | |
2236 | if (!(zc->flags & TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT)) | |
2237 | zap_page_range(vma, address, total_bytes_to_map); | |
2238 | zc->length = total_bytes_to_map; | |
8f2b0293 SHY |
2239 | zc->recv_skip_hint = 0; |
2240 | } else { | |
18fb76ed AR |
2241 | zc->length = avail_len; |
2242 | zc->recv_skip_hint = avail_len; | |
8f2b0293 | 2243 | } |
05255b82 ED |
2244 | ret = 0; |
2245 | while (length + PAGE_SIZE <= zc->length) { | |
98917cf0 | 2246 | int mappable_offset; |
94ab9eb9 | 2247 | struct page *page; |
98917cf0 | 2248 | |
05255b82 | 2249 | if (zc->recv_skip_hint < PAGE_SIZE) { |
7fba5309 AR |
2250 | u32 offset_frag; |
2251 | ||
05255b82 | 2252 | if (skb) { |
0e627190 AR |
2253 | if (zc->recv_skip_hint > 0) |
2254 | break; | |
05255b82 ED |
2255 | skb = skb->next; |
2256 | offset = seq - TCP_SKB_CB(skb)->seq; | |
2257 | } else { | |
2258 | skb = tcp_recv_skb(sk, seq, &offset); | |
2259 | } | |
7eeba170 AR |
2260 | |
2261 | if (TCP_SKB_CB(skb)->has_rxtstamp) { | |
2262 | tcp_update_recv_tstamps(skb, tss); | |
2263 | zc->msg_flags |= TCP_CMSG_TS; | |
2264 | } | |
05255b82 | 2265 | zc->recv_skip_hint = skb->len - offset; |
7fba5309 AR |
2266 | frags = skb_advance_to_frag(skb, offset, &offset_frag); |
2267 | if (!frags || offset_frag) | |
05255b82 | 2268 | break; |
93ab6cc6 | 2269 | } |
789762ce | 2270 | |
98917cf0 AR |
2271 | mappable_offset = find_next_mappable_frag(frags, |
2272 | zc->recv_skip_hint); | |
2273 | if (mappable_offset) { | |
2274 | zc->recv_skip_hint = mappable_offset; | |
05255b82 | 2275 | break; |
789762ce | 2276 | } |
94ab9eb9 AR |
2277 | page = skb_frag_page(frags); |
2278 | prefetchw(page); | |
2279 | pages[pages_to_map++] = page; | |
05255b82 | 2280 | length += PAGE_SIZE; |
05255b82 ED |
2281 | zc->recv_skip_hint -= PAGE_SIZE; |
2282 | frags++; | |
94ab9eb9 AR |
2283 | if (pages_to_map == TCP_ZEROCOPY_PAGE_BATCH_SIZE || |
2284 | zc->recv_skip_hint < PAGE_SIZE) { | |
2285 | /* Either full batch, or we're about to go to next skb | |
2286 | * (and we cannot unroll failed ops across skbs). | |
2287 | */ | |
2288 | ret = tcp_zerocopy_vm_insert_batch(vma, pages, | |
2289 | pages_to_map, | |
2290 | &address, &length, | |
2291 | &seq, zc, | |
2292 | total_bytes_to_map); | |
3763a24c AR |
2293 | if (ret) |
2294 | goto out; | |
94ab9eb9 | 2295 | pages_to_map = 0; |
3763a24c AR |
2296 | } |
2297 | } | |
94ab9eb9 AR |
2298 | if (pages_to_map) { |
2299 | ret = tcp_zerocopy_vm_insert_batch(vma, pages, pages_to_map, | |
2300 | &address, &length, &seq, | |
2301 | zc, total_bytes_to_map); | |
93ab6cc6 | 2302 | } |
93ab6cc6 | 2303 | out: |
d8ed45c5 | 2304 | mmap_read_unlock(current->mm); |
18fb76ed AR |
2305 | /* Try to copy straggler data. */ |
2306 | if (!ret) | |
7eeba170 | 2307 | copylen = tcp_zc_handle_leftover(zc, sk, skb, &seq, copybuf_len, tss); |
18fb76ed AR |
2308 | |
2309 | if (length + copylen) { | |
7db48e98 | 2310 | WRITE_ONCE(tp->copied_seq, seq); |
05255b82 ED |
2311 | tcp_rcv_space_adjust(sk); |
2312 | ||
2313 | /* Clean up data we have read: This will do ACK frames. */ | |
2314 | tcp_recv_skb(sk, seq, &offset); | |
18fb76ed | 2315 | tcp_cleanup_rbuf(sk, length + copylen); |
05255b82 ED |
2316 | ret = 0; |
2317 | if (length == zc->length) | |
2318 | zc->recv_skip_hint = 0; | |
2319 | } else { | |
2320 | if (!zc->recv_skip_hint && sock_flag(sk, SOCK_DONE)) | |
2321 | ret = -EIO; | |
2322 | } | |
2323 | zc->length = length; | |
93ab6cc6 ED |
2324 | return ret; |
2325 | } | |
05255b82 | 2326 | #endif |
93ab6cc6 | 2327 | |
98aaa913 | 2328 | /* Similar to __sock_recv_timestamp, but does not require an skb */ |
892bfd3d FW |
2329 | void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk, |
2330 | struct scm_timestamping_internal *tss) | |
98aaa913 | 2331 | { |
887feae3 | 2332 | int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW); |
98aaa913 MM |
2333 | bool has_timestamping = false; |
2334 | ||
2335 | if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) { | |
2336 | if (sock_flag(sk, SOCK_RCVTSTAMP)) { | |
2337 | if (sock_flag(sk, SOCK_RCVTSTAMPNS)) { | |
887feae3 | 2338 | if (new_tstamp) { |
df1b4ba9 AB |
2339 | struct __kernel_timespec kts = { |
2340 | .tv_sec = tss->ts[0].tv_sec, | |
2341 | .tv_nsec = tss->ts[0].tv_nsec, | |
2342 | }; | |
887feae3 DD |
2343 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW, |
2344 | sizeof(kts), &kts); | |
2345 | } else { | |
df1b4ba9 AB |
2346 | struct __kernel_old_timespec ts_old = { |
2347 | .tv_sec = tss->ts[0].tv_sec, | |
2348 | .tv_nsec = tss->ts[0].tv_nsec, | |
2349 | }; | |
887feae3 | 2350 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD, |
9718475e | 2351 | sizeof(ts_old), &ts_old); |
887feae3 | 2352 | } |
98aaa913 | 2353 | } else { |
887feae3 | 2354 | if (new_tstamp) { |
df1b4ba9 AB |
2355 | struct __kernel_sock_timeval stv = { |
2356 | .tv_sec = tss->ts[0].tv_sec, | |
2357 | .tv_usec = tss->ts[0].tv_nsec / 1000, | |
2358 | }; | |
887feae3 DD |
2359 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW, |
2360 | sizeof(stv), &stv); | |
2361 | } else { | |
df1b4ba9 AB |
2362 | struct __kernel_old_timeval tv = { |
2363 | .tv_sec = tss->ts[0].tv_sec, | |
2364 | .tv_usec = tss->ts[0].tv_nsec / 1000, | |
2365 | }; | |
887feae3 DD |
2366 | put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD, |
2367 | sizeof(tv), &tv); | |
2368 | } | |
98aaa913 MM |
2369 | } |
2370 | } | |
2371 | ||
2372 | if (sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) | |
2373 | has_timestamping = true; | |
2374 | else | |
9718475e | 2375 | tss->ts[0] = (struct timespec64) {0}; |
98aaa913 MM |
2376 | } |
2377 | ||
2378 | if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) { | |
2379 | if (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE) | |
2380 | has_timestamping = true; | |
2381 | else | |
9718475e | 2382 | tss->ts[2] = (struct timespec64) {0}; |
98aaa913 MM |
2383 | } |
2384 | ||
2385 | if (has_timestamping) { | |
9718475e DD |
2386 | tss->ts[1] = (struct timespec64) {0}; |
2387 | if (sock_flag(sk, SOCK_TSTAMP_NEW)) | |
2388 | put_cmsg_scm_timestamping64(msg, tss); | |
2389 | else | |
2390 | put_cmsg_scm_timestamping(msg, tss); | |
98aaa913 MM |
2391 | } |
2392 | } | |
2393 | ||
b75eba76 SHY |
2394 | static int tcp_inq_hint(struct sock *sk) |
2395 | { | |
2396 | const struct tcp_sock *tp = tcp_sk(sk); | |
2397 | u32 copied_seq = READ_ONCE(tp->copied_seq); | |
2398 | u32 rcv_nxt = READ_ONCE(tp->rcv_nxt); | |
2399 | int inq; | |
2400 | ||
2401 | inq = rcv_nxt - copied_seq; | |
2402 | if (unlikely(inq < 0 || copied_seq != READ_ONCE(tp->copied_seq))) { | |
2403 | lock_sock(sk); | |
2404 | inq = tp->rcv_nxt - tp->copied_seq; | |
2405 | release_sock(sk); | |
2406 | } | |
6466e715 SHY |
2407 | /* After receiving a FIN, tell the user-space to continue reading |
2408 | * by returning a non-zero inq. | |
2409 | */ | |
2410 | if (inq == 0 && sock_flag(sk, SOCK_DONE)) | |
2411 | inq = 1; | |
b75eba76 SHY |
2412 | return inq; |
2413 | } | |
2414 | ||
1da177e4 LT |
2415 | /* |
2416 | * This routine copies from a sock struct into the user buffer. | |
2417 | * | |
2418 | * Technical note: in 2.3 we work on _locked_ socket, so that | |
2419 | * tricks with *seq access order and skb->users are not required. | |
2420 | * Probably, code can be easily improved even more. | |
2421 | */ | |
2422 | ||
2cd81161 | 2423 | static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len, |
ec095263 | 2424 | int flags, struct scm_timestamping_internal *tss, |
2cd81161 | 2425 | int *cmsg_flags) |
1da177e4 LT |
2426 | { |
2427 | struct tcp_sock *tp = tcp_sk(sk); | |
2428 | int copied = 0; | |
2429 | u32 peek_seq; | |
2430 | u32 *seq; | |
2431 | unsigned long used; | |
2cd81161 | 2432 | int err; |
1da177e4 LT |
2433 | int target; /* Read at least this many bytes */ |
2434 | long timeo; | |
dfbafc99 | 2435 | struct sk_buff *skb, *last; |
77527313 | 2436 | u32 urg_hole = 0; |
1da177e4 | 2437 | |
1da177e4 LT |
2438 | err = -ENOTCONN; |
2439 | if (sk->sk_state == TCP_LISTEN) | |
2440 | goto out; | |
2441 | ||
f94fd25c | 2442 | if (tp->recvmsg_inq) { |
925bba24 | 2443 | *cmsg_flags = TCP_CMSG_INQ; |
f94fd25c JA |
2444 | msg->msg_get_inq = 1; |
2445 | } | |
ec095263 | 2446 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
1da177e4 LT |
2447 | |
2448 | /* Urgent data needs to be handled specially. */ | |
2449 | if (flags & MSG_OOB) | |
2450 | goto recv_urg; | |
2451 | ||
c0e88ff0 PE |
2452 | if (unlikely(tp->repair)) { |
2453 | err = -EPERM; | |
2454 | if (!(flags & MSG_PEEK)) | |
2455 | goto out; | |
2456 | ||
2457 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
2458 | goto recv_sndq; | |
2459 | ||
2460 | err = -EINVAL; | |
2461 | if (tp->repair_queue == TCP_NO_QUEUE) | |
2462 | goto out; | |
2463 | ||
2464 | /* 'common' recv queue MSG_PEEK-ing */ | |
2465 | } | |
2466 | ||
1da177e4 LT |
2467 | seq = &tp->copied_seq; |
2468 | if (flags & MSG_PEEK) { | |
2469 | peek_seq = tp->copied_seq; | |
2470 | seq = &peek_seq; | |
2471 | } | |
2472 | ||
2473 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
2474 | ||
2475 | do { | |
1da177e4 LT |
2476 | u32 offset; |
2477 | ||
2478 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ | |
b96c51bd | 2479 | if (unlikely(tp->urg_data) && tp->urg_seq == *seq) { |
1da177e4 LT |
2480 | if (copied) |
2481 | break; | |
2482 | if (signal_pending(current)) { | |
2483 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
2484 | break; | |
2485 | } | |
2486 | } | |
2487 | ||
2488 | /* Next get a buffer. */ | |
2489 | ||
dfbafc99 | 2490 | last = skb_peek_tail(&sk->sk_receive_queue); |
91521944 | 2491 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
dfbafc99 | 2492 | last = skb; |
1da177e4 LT |
2493 | /* Now that we have two receive queues this |
2494 | * shouldn't happen. | |
2495 | */ | |
d792c100 | 2496 | if (WARN(before(*seq, TCP_SKB_CB(skb)->seq), |
e56b8ce3 | 2497 | "TCP recvmsg seq # bug: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b JP |
2498 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, |
2499 | flags)) | |
1da177e4 | 2500 | break; |
d792c100 | 2501 | |
1da177e4 | 2502 | offset = *seq - TCP_SKB_CB(skb)->seq; |
9d691539 ED |
2503 | if (unlikely(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN)) { |
2504 | pr_err_once("%s: found a SYN, please report !\n", __func__); | |
1da177e4 | 2505 | offset--; |
9d691539 | 2506 | } |
1da177e4 LT |
2507 | if (offset < skb->len) |
2508 | goto found_ok_skb; | |
e11ecddf | 2509 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2510 | goto found_fin_ok; |
2af6fd8b | 2511 | WARN(!(flags & MSG_PEEK), |
e56b8ce3 | 2512 | "TCP recvmsg seq # bug 2: copied %X, seq %X, rcvnxt %X, fl %X\n", |
2af6fd8b | 2513 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, flags); |
91521944 | 2514 | } |
1da177e4 LT |
2515 | |
2516 | /* Well, if we have backlog, try to process it now yet. */ | |
2517 | ||
9ed498c6 | 2518 | if (copied >= target && !READ_ONCE(sk->sk_backlog.tail)) |
1da177e4 LT |
2519 | break; |
2520 | ||
2521 | if (copied) { | |
8bd172b7 ED |
2522 | if (!timeo || |
2523 | sk->sk_err || | |
1da177e4 LT |
2524 | sk->sk_state == TCP_CLOSE || |
2525 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
518a09ef | 2526 | signal_pending(current)) |
1da177e4 LT |
2527 | break; |
2528 | } else { | |
2529 | if (sock_flag(sk, SOCK_DONE)) | |
2530 | break; | |
2531 | ||
2532 | if (sk->sk_err) { | |
2533 | copied = sock_error(sk); | |
2534 | break; | |
2535 | } | |
2536 | ||
2537 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2538 | break; | |
2539 | ||
2540 | if (sk->sk_state == TCP_CLOSE) { | |
c47078d6 ED |
2541 | /* This occurs when user tries to read |
2542 | * from never connected socket. | |
2543 | */ | |
2544 | copied = -ENOTCONN; | |
1da177e4 LT |
2545 | break; |
2546 | } | |
2547 | ||
2548 | if (!timeo) { | |
2549 | copied = -EAGAIN; | |
2550 | break; | |
2551 | } | |
2552 | ||
2553 | if (signal_pending(current)) { | |
2554 | copied = sock_intr_errno(timeo); | |
2555 | break; | |
2556 | } | |
2557 | } | |
2558 | ||
1da177e4 LT |
2559 | if (copied >= target) { |
2560 | /* Do not sleep, just process backlog. */ | |
93afcfd1 | 2561 | __sk_flush_backlog(sk); |
dfbafc99 | 2562 | } else { |
29fbc26e | 2563 | tcp_cleanup_rbuf(sk, copied); |
dfbafc99 SD |
2564 | sk_wait_data(sk, &timeo, last); |
2565 | } | |
1da177e4 | 2566 | |
77527313 IJ |
2567 | if ((flags & MSG_PEEK) && |
2568 | (peek_seq - copied - urg_hole != tp->copied_seq)) { | |
e87cc472 JP |
2569 | net_dbg_ratelimited("TCP(%s:%d): Application bug, race in MSG_PEEK\n", |
2570 | current->comm, | |
2571 | task_pid_nr(current)); | |
1da177e4 LT |
2572 | peek_seq = tp->copied_seq; |
2573 | } | |
2574 | continue; | |
2575 | ||
fdb8b298 | 2576 | found_ok_skb: |
1da177e4 LT |
2577 | /* Ok so how much can we use? */ |
2578 | used = skb->len - offset; | |
2579 | if (len < used) | |
2580 | used = len; | |
2581 | ||
2582 | /* Do we have urgent data here? */ | |
b96c51bd | 2583 | if (unlikely(tp->urg_data)) { |
1da177e4 LT |
2584 | u32 urg_offset = tp->urg_seq - *seq; |
2585 | if (urg_offset < used) { | |
2586 | if (!urg_offset) { | |
2587 | if (!sock_flag(sk, SOCK_URGINLINE)) { | |
7db48e98 | 2588 | WRITE_ONCE(*seq, *seq + 1); |
77527313 | 2589 | urg_hole++; |
1da177e4 LT |
2590 | offset++; |
2591 | used--; | |
2592 | if (!used) | |
2593 | goto skip_copy; | |
2594 | } | |
2595 | } else | |
2596 | used = urg_offset; | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 2601 | err = skb_copy_datagram_msg(skb, offset, msg, used); |
7bced397 DW |
2602 | if (err) { |
2603 | /* Exception. Bailout! */ | |
2604 | if (!copied) | |
2605 | copied = -EFAULT; | |
2606 | break; | |
1da177e4 LT |
2607 | } |
2608 | } | |
2609 | ||
7db48e98 | 2610 | WRITE_ONCE(*seq, *seq + used); |
1da177e4 LT |
2611 | copied += used; |
2612 | len -= used; | |
2613 | ||
2614 | tcp_rcv_space_adjust(sk); | |
2615 | ||
2616 | skip_copy: | |
b96c51bd | 2617 | if (unlikely(tp->urg_data) && after(tp->copied_seq, tp->urg_seq)) { |
7b6a893a | 2618 | WRITE_ONCE(tp->urg_data, 0); |
31770e34 FW |
2619 | tcp_fast_path_check(sk); |
2620 | } | |
1da177e4 | 2621 | |
98aaa913 | 2622 | if (TCP_SKB_CB(skb)->has_rxtstamp) { |
2cd81161 | 2623 | tcp_update_recv_tstamps(skb, tss); |
925bba24 | 2624 | *cmsg_flags |= TCP_CMSG_TS; |
98aaa913 | 2625 | } |
cc4de047 KL |
2626 | |
2627 | if (used + offset < skb->len) | |
2628 | continue; | |
2629 | ||
e11ecddf | 2630 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
1da177e4 | 2631 | goto found_fin_ok; |
7bced397 | 2632 | if (!(flags & MSG_PEEK)) |
3df684c1 | 2633 | tcp_eat_recv_skb(sk, skb); |
1da177e4 LT |
2634 | continue; |
2635 | ||
fdb8b298 | 2636 | found_fin_ok: |
1da177e4 | 2637 | /* Process the FIN. */ |
7db48e98 | 2638 | WRITE_ONCE(*seq, *seq + 1); |
7bced397 | 2639 | if (!(flags & MSG_PEEK)) |
3df684c1 | 2640 | tcp_eat_recv_skb(sk, skb); |
1da177e4 LT |
2641 | break; |
2642 | } while (len > 0); | |
2643 | ||
1da177e4 LT |
2644 | /* According to UNIX98, msg_name/msg_namelen are ignored |
2645 | * on connected socket. I was just happy when found this 8) --ANK | |
2646 | */ | |
2647 | ||
2648 | /* Clean up data we have read: This will do ACK frames. */ | |
0e4b4992 | 2649 | tcp_cleanup_rbuf(sk, copied); |
1da177e4 LT |
2650 | return copied; |
2651 | ||
2652 | out: | |
1da177e4 LT |
2653 | return err; |
2654 | ||
2655 | recv_urg: | |
377f0a08 | 2656 | err = tcp_recv_urg(sk, msg, len, flags); |
1da177e4 | 2657 | goto out; |
c0e88ff0 PE |
2658 | |
2659 | recv_sndq: | |
2660 | err = tcp_peek_sndq(sk, msg, len); | |
2661 | goto out; | |
1da177e4 | 2662 | } |
2cd81161 | 2663 | |
ec095263 OH |
2664 | int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags, |
2665 | int *addr_len) | |
2cd81161 | 2666 | { |
f94fd25c | 2667 | int cmsg_flags = 0, ret; |
2cd81161 AR |
2668 | struct scm_timestamping_internal tss; |
2669 | ||
2670 | if (unlikely(flags & MSG_ERRQUEUE)) | |
2671 | return inet_recv_error(sk, msg, len, addr_len); | |
2672 | ||
2673 | if (sk_can_busy_loop(sk) && | |
2674 | skb_queue_empty_lockless(&sk->sk_receive_queue) && | |
2675 | sk->sk_state == TCP_ESTABLISHED) | |
ec095263 | 2676 | sk_busy_loop(sk, flags & MSG_DONTWAIT); |
2cd81161 AR |
2677 | |
2678 | lock_sock(sk); | |
ec095263 | 2679 | ret = tcp_recvmsg_locked(sk, msg, len, flags, &tss, &cmsg_flags); |
2cd81161 AR |
2680 | release_sock(sk); |
2681 | ||
f94fd25c | 2682 | if ((cmsg_flags || msg->msg_get_inq) && ret >= 0) { |
925bba24 | 2683 | if (cmsg_flags & TCP_CMSG_TS) |
2cd81161 | 2684 | tcp_recv_timestamp(msg, sk, &tss); |
f94fd25c JA |
2685 | if (msg->msg_get_inq) { |
2686 | msg->msg_inq = tcp_inq_hint(sk); | |
2687 | if (cmsg_flags & TCP_CMSG_INQ) | |
2688 | put_cmsg(msg, SOL_TCP, TCP_CM_INQ, | |
2689 | sizeof(msg->msg_inq), &msg->msg_inq); | |
2cd81161 AR |
2690 | } |
2691 | } | |
2692 | return ret; | |
2693 | } | |
4bc2f18b | 2694 | EXPORT_SYMBOL(tcp_recvmsg); |
1da177e4 | 2695 | |
490d5046 IJ |
2696 | void tcp_set_state(struct sock *sk, int state) |
2697 | { | |
2698 | int oldstate = sk->sk_state; | |
2699 | ||
d4487491 LB |
2700 | /* We defined a new enum for TCP states that are exported in BPF |
2701 | * so as not force the internal TCP states to be frozen. The | |
2702 | * following checks will detect if an internal state value ever | |
2703 | * differs from the BPF value. If this ever happens, then we will | |
2704 | * need to remap the internal value to the BPF value before calling | |
2705 | * tcp_call_bpf_2arg. | |
2706 | */ | |
2707 | BUILD_BUG_ON((int)BPF_TCP_ESTABLISHED != (int)TCP_ESTABLISHED); | |
2708 | BUILD_BUG_ON((int)BPF_TCP_SYN_SENT != (int)TCP_SYN_SENT); | |
2709 | BUILD_BUG_ON((int)BPF_TCP_SYN_RECV != (int)TCP_SYN_RECV); | |
2710 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT1 != (int)TCP_FIN_WAIT1); | |
2711 | BUILD_BUG_ON((int)BPF_TCP_FIN_WAIT2 != (int)TCP_FIN_WAIT2); | |
2712 | BUILD_BUG_ON((int)BPF_TCP_TIME_WAIT != (int)TCP_TIME_WAIT); | |
2713 | BUILD_BUG_ON((int)BPF_TCP_CLOSE != (int)TCP_CLOSE); | |
2714 | BUILD_BUG_ON((int)BPF_TCP_CLOSE_WAIT != (int)TCP_CLOSE_WAIT); | |
2715 | BUILD_BUG_ON((int)BPF_TCP_LAST_ACK != (int)TCP_LAST_ACK); | |
2716 | BUILD_BUG_ON((int)BPF_TCP_LISTEN != (int)TCP_LISTEN); | |
2717 | BUILD_BUG_ON((int)BPF_TCP_CLOSING != (int)TCP_CLOSING); | |
2718 | BUILD_BUG_ON((int)BPF_TCP_NEW_SYN_RECV != (int)TCP_NEW_SYN_RECV); | |
2719 | BUILD_BUG_ON((int)BPF_TCP_MAX_STATES != (int)TCP_MAX_STATES); | |
2720 | ||
97a19caf YS |
2721 | /* bpf uapi header bpf.h defines an anonymous enum with values |
2722 | * BPF_TCP_* used by bpf programs. Currently gcc built vmlinux | |
2723 | * is able to emit this enum in DWARF due to the above BUILD_BUG_ON. | |
2724 | * But clang built vmlinux does not have this enum in DWARF | |
2725 | * since clang removes the above code before generating IR/debuginfo. | |
2726 | * Let us explicitly emit the type debuginfo to ensure the | |
2727 | * above-mentioned anonymous enum in the vmlinux DWARF and hence BTF | |
2728 | * regardless of which compiler is used. | |
2729 | */ | |
2730 | BTF_TYPE_EMIT_ENUM(BPF_TCP_ESTABLISHED); | |
2731 | ||
d4487491 LB |
2732 | if (BPF_SOCK_OPS_TEST_FLAG(tcp_sk(sk), BPF_SOCK_OPS_STATE_CB_FLAG)) |
2733 | tcp_call_bpf_2arg(sk, BPF_SOCK_OPS_STATE_CB, oldstate, state); | |
e8fce239 | 2734 | |
490d5046 IJ |
2735 | switch (state) { |
2736 | case TCP_ESTABLISHED: | |
2737 | if (oldstate != TCP_ESTABLISHED) | |
81cc8a75 | 2738 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2739 | break; |
2740 | ||
2741 | case TCP_CLOSE: | |
2742 | if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) | |
81cc8a75 | 2743 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ESTABRESETS); |
490d5046 IJ |
2744 | |
2745 | sk->sk_prot->unhash(sk); | |
2746 | if (inet_csk(sk)->icsk_bind_hash && | |
2747 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
ab1e0a13 | 2748 | inet_put_port(sk); |
a8eceea8 | 2749 | fallthrough; |
490d5046 | 2750 | default: |
5a5f3a8d | 2751 | if (oldstate == TCP_ESTABLISHED) |
74688e48 | 2752 | TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
490d5046 IJ |
2753 | } |
2754 | ||
2755 | /* Change state AFTER socket is unhashed to avoid closed | |
2756 | * socket sitting in hash tables. | |
2757 | */ | |
563e0bb0 | 2758 | inet_sk_state_store(sk, state); |
490d5046 IJ |
2759 | } |
2760 | EXPORT_SYMBOL_GPL(tcp_set_state); | |
2761 | ||
1da177e4 LT |
2762 | /* |
2763 | * State processing on a close. This implements the state shift for | |
2764 | * sending our FIN frame. Note that we only send a FIN for some | |
2765 | * states. A shutdown() may have already sent the FIN, or we may be | |
2766 | * closed. | |
2767 | */ | |
2768 | ||
9b5b5cff | 2769 | static const unsigned char new_state[16] = { |
1da177e4 | 2770 | /* current state: new state: action: */ |
0980c1e3 ED |
2771 | [0 /* (Invalid) */] = TCP_CLOSE, |
2772 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2773 | [TCP_SYN_SENT] = TCP_CLOSE, | |
2774 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, | |
2775 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, | |
2776 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, | |
2777 | [TCP_TIME_WAIT] = TCP_CLOSE, | |
2778 | [TCP_CLOSE] = TCP_CLOSE, | |
2779 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, | |
2780 | [TCP_LAST_ACK] = TCP_LAST_ACK, | |
2781 | [TCP_LISTEN] = TCP_CLOSE, | |
2782 | [TCP_CLOSING] = TCP_CLOSING, | |
2783 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ | |
1da177e4 LT |
2784 | }; |
2785 | ||
2786 | static int tcp_close_state(struct sock *sk) | |
2787 | { | |
2788 | int next = (int)new_state[sk->sk_state]; | |
2789 | int ns = next & TCP_STATE_MASK; | |
2790 | ||
2791 | tcp_set_state(sk, ns); | |
2792 | ||
2793 | return next & TCP_ACTION_FIN; | |
2794 | } | |
2795 | ||
2796 | /* | |
2797 | * Shutdown the sending side of a connection. Much like close except | |
1f29b058 | 2798 | * that we don't receive shut down or sock_set_flag(sk, SOCK_DEAD). |
1da177e4 LT |
2799 | */ |
2800 | ||
2801 | void tcp_shutdown(struct sock *sk, int how) | |
2802 | { | |
2803 | /* We need to grab some memory, and put together a FIN, | |
2804 | * and then put it into the queue to be sent. | |
2805 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. | |
2806 | */ | |
2807 | if (!(how & SEND_SHUTDOWN)) | |
2808 | return; | |
2809 | ||
2810 | /* If we've already sent a FIN, or it's a closed state, skip this. */ | |
2811 | if ((1 << sk->sk_state) & | |
2812 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | | |
2813 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { | |
2814 | /* Clear out any half completed packets. FIN if needed. */ | |
2815 | if (tcp_close_state(sk)) | |
2816 | tcp_send_fin(sk); | |
2817 | } | |
2818 | } | |
4bc2f18b | 2819 | EXPORT_SYMBOL(tcp_shutdown); |
1da177e4 | 2820 | |
19757ceb ED |
2821 | int tcp_orphan_count_sum(void) |
2822 | { | |
2823 | int i, total = 0; | |
2824 | ||
2825 | for_each_possible_cpu(i) | |
2826 | total += per_cpu(tcp_orphan_count, i); | |
2827 | ||
2828 | return max(total, 0); | |
2829 | } | |
2830 | ||
2831 | static int tcp_orphan_cache; | |
2832 | static struct timer_list tcp_orphan_timer; | |
2833 | #define TCP_ORPHAN_TIMER_PERIOD msecs_to_jiffies(100) | |
2834 | ||
2835 | static void tcp_orphan_update(struct timer_list *unused) | |
2836 | { | |
2837 | WRITE_ONCE(tcp_orphan_cache, tcp_orphan_count_sum()); | |
2838 | mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD); | |
2839 | } | |
2840 | ||
2841 | static bool tcp_too_many_orphans(int shift) | |
2842 | { | |
47e6ab24 KI |
2843 | return READ_ONCE(tcp_orphan_cache) << shift > |
2844 | READ_ONCE(sysctl_tcp_max_orphans); | |
19757ceb ED |
2845 | } |
2846 | ||
efcdbf24 AS |
2847 | bool tcp_check_oom(struct sock *sk, int shift) |
2848 | { | |
2849 | bool too_many_orphans, out_of_socket_memory; | |
2850 | ||
19757ceb | 2851 | too_many_orphans = tcp_too_many_orphans(shift); |
efcdbf24 AS |
2852 | out_of_socket_memory = tcp_out_of_memory(sk); |
2853 | ||
e87cc472 JP |
2854 | if (too_many_orphans) |
2855 | net_info_ratelimited("too many orphaned sockets\n"); | |
2856 | if (out_of_socket_memory) | |
2857 | net_info_ratelimited("out of memory -- consider tuning tcp_mem\n"); | |
efcdbf24 AS |
2858 | return too_many_orphans || out_of_socket_memory; |
2859 | } | |
2860 | ||
77c3c956 | 2861 | void __tcp_close(struct sock *sk, long timeout) |
1da177e4 LT |
2862 | { |
2863 | struct sk_buff *skb; | |
2864 | int data_was_unread = 0; | |
75c2d907 | 2865 | int state; |
1da177e4 | 2866 | |
1da177e4 LT |
2867 | sk->sk_shutdown = SHUTDOWN_MASK; |
2868 | ||
2869 | if (sk->sk_state == TCP_LISTEN) { | |
2870 | tcp_set_state(sk, TCP_CLOSE); | |
2871 | ||
2872 | /* Special case. */ | |
0a5578cf | 2873 | inet_csk_listen_stop(sk); |
1da177e4 LT |
2874 | |
2875 | goto adjudge_to_death; | |
2876 | } | |
2877 | ||
2878 | /* We need to flush the recv. buffs. We do this only on the | |
2879 | * descriptor close, not protocol-sourced closes, because the | |
2880 | * reader process may not have drained the data yet! | |
2881 | */ | |
2882 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e11ecddf ED |
2883 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq; |
2884 | ||
2885 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) | |
2886 | len--; | |
1da177e4 LT |
2887 | data_was_unread += len; |
2888 | __kfree_skb(skb); | |
2889 | } | |
2890 | ||
565b7b2d KK |
2891 | /* If socket has been already reset (e.g. in tcp_reset()) - kill it. */ |
2892 | if (sk->sk_state == TCP_CLOSE) | |
2893 | goto adjudge_to_death; | |
2894 | ||
65bb723c GR |
2895 | /* As outlined in RFC 2525, section 2.17, we send a RST here because |
2896 | * data was lost. To witness the awful effects of the old behavior of | |
2897 | * always doing a FIN, run an older 2.1.x kernel or 2.0.x, start a bulk | |
2898 | * GET in an FTP client, suspend the process, wait for the client to | |
2899 | * advertise a zero window, then kill -9 the FTP client, wheee... | |
2900 | * Note: timeout is always zero in such a case. | |
1da177e4 | 2901 | */ |
ee995283 PE |
2902 | if (unlikely(tcp_sk(sk)->repair)) { |
2903 | sk->sk_prot->disconnect(sk, 0); | |
2904 | } else if (data_was_unread) { | |
1da177e4 | 2905 | /* Unread data was tossed, zap the connection. */ |
6aef70a8 | 2906 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE); |
1da177e4 | 2907 | tcp_set_state(sk, TCP_CLOSE); |
aa133076 | 2908 | tcp_send_active_reset(sk, sk->sk_allocation); |
1da177e4 LT |
2909 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
2910 | /* Check zero linger _after_ checking for unread data. */ | |
2911 | sk->sk_prot->disconnect(sk, 0); | |
6aef70a8 | 2912 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA); |
1da177e4 LT |
2913 | } else if (tcp_close_state(sk)) { |
2914 | /* We FIN if the application ate all the data before | |
2915 | * zapping the connection. | |
2916 | */ | |
2917 | ||
2918 | /* RED-PEN. Formally speaking, we have broken TCP state | |
2919 | * machine. State transitions: | |
2920 | * | |
2921 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 | |
2922 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) | |
2923 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK | |
2924 | * | |
2925 | * are legal only when FIN has been sent (i.e. in window), | |
2926 | * rather than queued out of window. Purists blame. | |
2927 | * | |
2928 | * F.e. "RFC state" is ESTABLISHED, | |
2929 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. | |
2930 | * | |
2931 | * The visible declinations are that sometimes | |
2932 | * we enter time-wait state, when it is not required really | |
2933 | * (harmless), do not send active resets, when they are | |
2934 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when | |
2935 | * they look as CLOSING or LAST_ACK for Linux) | |
2936 | * Probably, I missed some more holelets. | |
2937 | * --ANK | |
8336886f JC |
2938 | * XXX (TFO) - To start off we don't support SYN+ACK+FIN |
2939 | * in a single packet! (May consider it later but will | |
2940 | * probably need API support or TCP_CORK SYN-ACK until | |
2941 | * data is written and socket is closed.) | |
1da177e4 LT |
2942 | */ |
2943 | tcp_send_fin(sk); | |
2944 | } | |
2945 | ||
2946 | sk_stream_wait_close(sk, timeout); | |
2947 | ||
2948 | adjudge_to_death: | |
75c2d907 HX |
2949 | state = sk->sk_state; |
2950 | sock_hold(sk); | |
2951 | sock_orphan(sk); | |
75c2d907 | 2952 | |
1da177e4 LT |
2953 | local_bh_disable(); |
2954 | bh_lock_sock(sk); | |
8873c064 ED |
2955 | /* remove backlog if any, without releasing ownership. */ |
2956 | __release_sock(sk); | |
1da177e4 | 2957 | |
19757ceb | 2958 | this_cpu_inc(tcp_orphan_count); |
eb4dea58 | 2959 | |
75c2d907 HX |
2960 | /* Have we already been destroyed by a softirq or backlog? */ |
2961 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) | |
2962 | goto out; | |
1da177e4 LT |
2963 | |
2964 | /* This is a (useful) BSD violating of the RFC. There is a | |
2965 | * problem with TCP as specified in that the other end could | |
2966 | * keep a socket open forever with no application left this end. | |
b10bd54c | 2967 | * We use a 1 minute timeout (about the same as BSD) then kill |
1da177e4 LT |
2968 | * our end. If they send after that then tough - BUT: long enough |
2969 | * that we won't make the old 4*rto = almost no time - whoops | |
2970 | * reset mistake. | |
2971 | * | |
2972 | * Nope, it was not mistake. It is really desired behaviour | |
2973 | * f.e. on http servers, when such sockets are useless, but | |
2974 | * consume significant resources. Let's do it with special | |
2975 | * linger2 option. --ANK | |
2976 | */ | |
2977 | ||
2978 | if (sk->sk_state == TCP_FIN_WAIT2) { | |
2979 | struct tcp_sock *tp = tcp_sk(sk); | |
2980 | if (tp->linger2 < 0) { | |
2981 | tcp_set_state(sk, TCP_CLOSE); | |
2982 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 2983 | __NET_INC_STATS(sock_net(sk), |
de0744af | 2984 | LINUX_MIB_TCPABORTONLINGER); |
1da177e4 | 2985 | } else { |
463c84b9 | 2986 | const int tmo = tcp_fin_time(sk); |
1da177e4 LT |
2987 | |
2988 | if (tmo > TCP_TIMEWAIT_LEN) { | |
52499afe DM |
2989 | inet_csk_reset_keepalive_timer(sk, |
2990 | tmo - TCP_TIMEWAIT_LEN); | |
1da177e4 | 2991 | } else { |
1da177e4 LT |
2992 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
2993 | goto out; | |
2994 | } | |
2995 | } | |
2996 | } | |
2997 | if (sk->sk_state != TCP_CLOSE) { | |
efcdbf24 | 2998 | if (tcp_check_oom(sk, 0)) { |
1da177e4 LT |
2999 | tcp_set_state(sk, TCP_CLOSE); |
3000 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
02a1d6e7 | 3001 | __NET_INC_STATS(sock_net(sk), |
de0744af | 3002 | LINUX_MIB_TCPABORTONMEMORY); |
4ee806d5 DS |
3003 | } else if (!check_net(sock_net(sk))) { |
3004 | /* Not possible to send reset; just close */ | |
3005 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 LT |
3006 | } |
3007 | } | |
1da177e4 | 3008 | |
8336886f | 3009 | if (sk->sk_state == TCP_CLOSE) { |
d983ea6f ED |
3010 | struct request_sock *req; |
3011 | ||
3012 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, | |
3013 | lockdep_sock_is_held(sk)); | |
8336886f JC |
3014 | /* We could get here with a non-NULL req if the socket is |
3015 | * aborted (e.g., closed with unread data) before 3WHS | |
3016 | * finishes. | |
3017 | */ | |
00db4124 | 3018 | if (req) |
8336886f | 3019 | reqsk_fastopen_remove(sk, req, false); |
0a5578cf | 3020 | inet_csk_destroy_sock(sk); |
8336886f | 3021 | } |
1da177e4 LT |
3022 | /* Otherwise, socket is reprieved until protocol close. */ |
3023 | ||
3024 | out: | |
3025 | bh_unlock_sock(sk); | |
3026 | local_bh_enable(); | |
77c3c956 PA |
3027 | } |
3028 | ||
3029 | void tcp_close(struct sock *sk, long timeout) | |
3030 | { | |
3031 | lock_sock(sk); | |
3032 | __tcp_close(sk, timeout); | |
8873c064 | 3033 | release_sock(sk); |
1da177e4 LT |
3034 | sock_put(sk); |
3035 | } | |
4bc2f18b | 3036 | EXPORT_SYMBOL(tcp_close); |
1da177e4 LT |
3037 | |
3038 | /* These states need RST on ABORT according to RFC793 */ | |
3039 | ||
a2a385d6 | 3040 | static inline bool tcp_need_reset(int state) |
1da177e4 LT |
3041 | { |
3042 | return (1 << state) & | |
3043 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | | |
a7150e38 | 3044 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); |
1da177e4 LT |
3045 | } |
3046 | ||
75c119af ED |
3047 | static void tcp_rtx_queue_purge(struct sock *sk) |
3048 | { | |
3049 | struct rb_node *p = rb_first(&sk->tcp_rtx_queue); | |
3050 | ||
2bec445f | 3051 | tcp_sk(sk)->highest_sack = NULL; |
75c119af ED |
3052 | while (p) { |
3053 | struct sk_buff *skb = rb_to_skb(p); | |
3054 | ||
3055 | p = rb_next(p); | |
3056 | /* Since we are deleting whole queue, no need to | |
3057 | * list_del(&skb->tcp_tsorted_anchor) | |
3058 | */ | |
3059 | tcp_rtx_queue_unlink(skb, sk); | |
03271f3a | 3060 | tcp_wmem_free_skb(sk, skb); |
75c119af ED |
3061 | } |
3062 | } | |
3063 | ||
ac3f09ba ED |
3064 | void tcp_write_queue_purge(struct sock *sk) |
3065 | { | |
3066 | struct sk_buff *skb; | |
3067 | ||
3068 | tcp_chrono_stop(sk, TCP_CHRONO_BUSY); | |
3069 | while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
3070 | tcp_skb_tsorted_anchor_cleanup(skb); | |
03271f3a | 3071 | tcp_wmem_free_skb(sk, skb); |
ac3f09ba | 3072 | } |
75c119af | 3073 | tcp_rtx_queue_purge(sk); |
ac3f09ba | 3074 | INIT_LIST_HEAD(&tcp_sk(sk)->tsorted_sent_queue); |
ac3f09ba | 3075 | tcp_clear_all_retrans_hints(tcp_sk(sk)); |
bffd168c | 3076 | tcp_sk(sk)->packets_out = 0; |
04c03114 | 3077 | inet_csk(sk)->icsk_backoff = 0; |
ac3f09ba ED |
3078 | } |
3079 | ||
1da177e4 LT |
3080 | int tcp_disconnect(struct sock *sk, int flags) |
3081 | { | |
3082 | struct inet_sock *inet = inet_sk(sk); | |
463c84b9 | 3083 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 3084 | struct tcp_sock *tp = tcp_sk(sk); |
1da177e4 | 3085 | int old_state = sk->sk_state; |
0f317464 | 3086 | u32 seq; |
1da177e4 LT |
3087 | |
3088 | if (old_state != TCP_CLOSE) | |
3089 | tcp_set_state(sk, TCP_CLOSE); | |
3090 | ||
3091 | /* ABORT function of RFC793 */ | |
3092 | if (old_state == TCP_LISTEN) { | |
0a5578cf | 3093 | inet_csk_listen_stop(sk); |
ee995283 PE |
3094 | } else if (unlikely(tp->repair)) { |
3095 | sk->sk_err = ECONNABORTED; | |
1da177e4 LT |
3096 | } else if (tcp_need_reset(old_state) || |
3097 | (tp->snd_nxt != tp->write_seq && | |
3098 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { | |
caa20d9a | 3099 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
1da177e4 LT |
3100 | * states |
3101 | */ | |
3102 | tcp_send_active_reset(sk, gfp_any()); | |
3103 | sk->sk_err = ECONNRESET; | |
a7150e38 ED |
3104 | } else if (old_state == TCP_SYN_SENT) |
3105 | sk->sk_err = ECONNRESET; | |
1da177e4 LT |
3106 | |
3107 | tcp_clear_xmit_timers(sk); | |
3108 | __skb_queue_purge(&sk->sk_receive_queue); | |
7db48e98 | 3109 | WRITE_ONCE(tp->copied_seq, tp->rcv_nxt); |
7b6a893a | 3110 | WRITE_ONCE(tp->urg_data, 0); |
fe067e8a | 3111 | tcp_write_queue_purge(sk); |
cf1ef3f0 | 3112 | tcp_fastopen_active_disable_ofo_check(sk); |
9f5afeae | 3113 | skb_rbtree_purge(&tp->out_of_order_queue); |
1da177e4 | 3114 | |
c720c7e8 | 3115 | inet->inet_dport = 0; |
1da177e4 LT |
3116 | |
3117 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
3118 | inet_reset_saddr(sk); | |
3119 | ||
3120 | sk->sk_shutdown = 0; | |
3121 | sock_reset_flag(sk, SOCK_DONE); | |
740b0f18 | 3122 | tp->srtt_us = 0; |
b9e2e689 | 3123 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
3f6c65d6 | 3124 | tp->rcv_rtt_last_tsecr = 0; |
0f317464 ED |
3125 | |
3126 | seq = tp->write_seq + tp->max_window + 2; | |
3127 | if (!seq) | |
3128 | seq = 1; | |
3129 | WRITE_ONCE(tp->write_seq, seq); | |
3130 | ||
463c84b9 | 3131 | icsk->icsk_backoff = 0; |
6687e988 | 3132 | icsk->icsk_probes_out = 0; |
9d9b1ee0 | 3133 | icsk->icsk_probes_tstamp = 0; |
6a408147 | 3134 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
ca584ba0 | 3135 | icsk->icsk_rto_min = TCP_RTO_MIN; |
2b8ee4f0 | 3136 | icsk->icsk_delack_max = TCP_DELACK_MAX; |
0b6a05c1 | 3137 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
40570375 | 3138 | tcp_snd_cwnd_set(tp, TCP_INIT_CWND); |
1da177e4 | 3139 | tp->snd_cwnd_cnt = 0; |
f4ce91ce NC |
3140 | tp->is_cwnd_limited = 0; |
3141 | tp->max_packets_out = 0; | |
1fdf475a | 3142 | tp->window_clamp = 0; |
2fbdd562 | 3143 | tp->delivered = 0; |
e21db6f6 | 3144 | tp->delivered_ce = 0; |
ce69e563 CP |
3145 | if (icsk->icsk_ca_ops->release) |
3146 | icsk->icsk_ca_ops->release(sk); | |
3147 | memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv)); | |
8919a9b3 | 3148 | icsk->icsk_ca_initialized = 0; |
6687e988 | 3149 | tcp_set_ca_state(sk, TCP_CA_Open); |
d4761754 | 3150 | tp->is_sack_reneg = 0; |
1da177e4 | 3151 | tcp_clear_retrans(tp); |
c13c48c0 | 3152 | tp->total_retrans = 0; |
463c84b9 | 3153 | inet_csk_delack_init(sk); |
499350a5 WW |
3154 | /* Initialize rcv_mss to TCP_MIN_MSS to avoid division by 0 |
3155 | * issue in __tcp_select_window() | |
3156 | */ | |
3157 | icsk->icsk_ack.rcv_mss = TCP_MIN_MSS; | |
b40b4f79 | 3158 | memset(&tp->rx_opt, 0, sizeof(tp->rx_opt)); |
1da177e4 | 3159 | __sk_dst_reset(sk); |
8f905c0e | 3160 | dst_release(xchg((__force struct dst_entry **)&sk->sk_rx_dst, NULL)); |
17c3060b | 3161 | tcp_saved_syn_free(tp); |
5d9f4262 | 3162 | tp->compressed_ack = 0; |
784f8344 ED |
3163 | tp->segs_in = 0; |
3164 | tp->segs_out = 0; | |
ba113c3a | 3165 | tp->bytes_sent = 0; |
e858faf5 CP |
3166 | tp->bytes_acked = 0; |
3167 | tp->bytes_received = 0; | |
fb31c9b9 | 3168 | tp->bytes_retrans = 0; |
db7ffee6 ED |
3169 | tp->data_segs_in = 0; |
3170 | tp->data_segs_out = 0; | |
7788174e YC |
3171 | tp->duplicate_sack[0].start_seq = 0; |
3172 | tp->duplicate_sack[0].end_seq = 0; | |
7e10b655 | 3173 | tp->dsack_dups = 0; |
7ec65372 | 3174 | tp->reord_seen = 0; |
5c701549 ED |
3175 | tp->retrans_out = 0; |
3176 | tp->sacked_out = 0; | |
3177 | tp->tlp_high_seq = 0; | |
3178 | tp->last_oow_ack_time = 0; | |
6cda8b74 ED |
3179 | /* There's a bubble in the pipe until at least the first ACK. */ |
3180 | tp->app_limited = ~0U; | |
792c4354 ED |
3181 | tp->rack.mstamp = 0; |
3182 | tp->rack.advanced = 0; | |
3183 | tp->rack.reo_wnd_steps = 1; | |
3184 | tp->rack.last_delivered = 0; | |
3185 | tp->rack.reo_wnd_persist = 0; | |
3186 | tp->rack.dsack_seen = 0; | |
6bcdc40d ED |
3187 | tp->syn_data_acked = 0; |
3188 | tp->rx_opt.saw_tstamp = 0; | |
3189 | tp->rx_opt.dsack = 0; | |
3190 | tp->rx_opt.num_sacks = 0; | |
f9af2dbb | 3191 | tp->rcv_ooopack = 0; |
6cda8b74 | 3192 | |
1da177e4 | 3193 | |
7db92362 WW |
3194 | /* Clean up fastopen related fields */ |
3195 | tcp_free_fastopen_req(tp); | |
3196 | inet->defer_connect = 0; | |
48027478 | 3197 | tp->fastopen_client_fail = 0; |
7db92362 | 3198 | |
c720c7e8 | 3199 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
1da177e4 | 3200 | |
9b42d55a LR |
3201 | if (sk->sk_frag.page) { |
3202 | put_page(sk->sk_frag.page); | |
3203 | sk->sk_frag.page = NULL; | |
3204 | sk->sk_frag.offset = 0; | |
3205 | } | |
e3ae2365 | 3206 | sk_error_report(sk); |
a01512b1 | 3207 | return 0; |
1da177e4 | 3208 | } |
4bc2f18b | 3209 | EXPORT_SYMBOL(tcp_disconnect); |
1da177e4 | 3210 | |
a2a385d6 | 3211 | static inline bool tcp_can_repair_sock(const struct sock *sk) |
ee995283 | 3212 | { |
cb388e7e | 3213 | return sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) && |
319b0534 | 3214 | (sk->sk_state != TCP_LISTEN); |
ee995283 PE |
3215 | } |
3216 | ||
d38d2b00 | 3217 | static int tcp_repair_set_window(struct tcp_sock *tp, sockptr_t optbuf, int len) |
b1ed4c4f AV |
3218 | { |
3219 | struct tcp_repair_window opt; | |
3220 | ||
3221 | if (!tp->repair) | |
3222 | return -EPERM; | |
3223 | ||
3224 | if (len != sizeof(opt)) | |
3225 | return -EINVAL; | |
3226 | ||
d38d2b00 | 3227 | if (copy_from_sockptr(&opt, optbuf, sizeof(opt))) |
b1ed4c4f AV |
3228 | return -EFAULT; |
3229 | ||
3230 | if (opt.max_window < opt.snd_wnd) | |
3231 | return -EINVAL; | |
3232 | ||
3233 | if (after(opt.snd_wl1, tp->rcv_nxt + opt.rcv_wnd)) | |
3234 | return -EINVAL; | |
3235 | ||
3236 | if (after(opt.rcv_wup, tp->rcv_nxt)) | |
3237 | return -EINVAL; | |
3238 | ||
3239 | tp->snd_wl1 = opt.snd_wl1; | |
3240 | tp->snd_wnd = opt.snd_wnd; | |
3241 | tp->max_window = opt.max_window; | |
3242 | ||
3243 | tp->rcv_wnd = opt.rcv_wnd; | |
3244 | tp->rcv_wup = opt.rcv_wup; | |
3245 | ||
3246 | return 0; | |
3247 | } | |
3248 | ||
d38d2b00 CH |
3249 | static int tcp_repair_options_est(struct sock *sk, sockptr_t optbuf, |
3250 | unsigned int len) | |
b139ba4e | 3251 | { |
15e56515 | 3252 | struct tcp_sock *tp = tcp_sk(sk); |
de248a75 | 3253 | struct tcp_repair_opt opt; |
d3c48151 | 3254 | size_t offset = 0; |
b139ba4e | 3255 | |
de248a75 | 3256 | while (len >= sizeof(opt)) { |
d3c48151 | 3257 | if (copy_from_sockptr_offset(&opt, optbuf, offset, sizeof(opt))) |
b139ba4e PE |
3258 | return -EFAULT; |
3259 | ||
d3c48151 | 3260 | offset += sizeof(opt); |
de248a75 | 3261 | len -= sizeof(opt); |
b139ba4e | 3262 | |
de248a75 PE |
3263 | switch (opt.opt_code) { |
3264 | case TCPOPT_MSS: | |
3265 | tp->rx_opt.mss_clamp = opt.opt_val; | |
15e56515 | 3266 | tcp_mtup_init(sk); |
b139ba4e | 3267 | break; |
de248a75 | 3268 | case TCPOPT_WINDOW: |
bc26ccd8 AV |
3269 | { |
3270 | u16 snd_wscale = opt.opt_val & 0xFFFF; | |
3271 | u16 rcv_wscale = opt.opt_val >> 16; | |
3272 | ||
589c49cb | 3273 | if (snd_wscale > TCP_MAX_WSCALE || rcv_wscale > TCP_MAX_WSCALE) |
bc26ccd8 | 3274 | return -EFBIG; |
b139ba4e | 3275 | |
bc26ccd8 AV |
3276 | tp->rx_opt.snd_wscale = snd_wscale; |
3277 | tp->rx_opt.rcv_wscale = rcv_wscale; | |
3278 | tp->rx_opt.wscale_ok = 1; | |
3279 | } | |
b139ba4e | 3280 | break; |
b139ba4e | 3281 | case TCPOPT_SACK_PERM: |
de248a75 PE |
3282 | if (opt.opt_val != 0) |
3283 | return -EINVAL; | |
3284 | ||
b139ba4e | 3285 | tp->rx_opt.sack_ok |= TCP_SACK_SEEN; |
b139ba4e PE |
3286 | break; |
3287 | case TCPOPT_TIMESTAMP: | |
de248a75 PE |
3288 | if (opt.opt_val != 0) |
3289 | return -EINVAL; | |
3290 | ||
b139ba4e PE |
3291 | tp->rx_opt.tstamp_ok = 1; |
3292 | break; | |
3293 | } | |
3294 | } | |
3295 | ||
3296 | return 0; | |
3297 | } | |
3298 | ||
a842fe14 ED |
3299 | DEFINE_STATIC_KEY_FALSE(tcp_tx_delay_enabled); |
3300 | EXPORT_SYMBOL(tcp_tx_delay_enabled); | |
3301 | ||
3302 | static void tcp_enable_tx_delay(void) | |
3303 | { | |
3304 | if (!static_branch_unlikely(&tcp_tx_delay_enabled)) { | |
3305 | static int __tcp_tx_delay_enabled = 0; | |
3306 | ||
3307 | if (cmpxchg(&__tcp_tx_delay_enabled, 0, 1) == 0) { | |
3308 | static_branch_enable(&tcp_tx_delay_enabled); | |
3309 | pr_info("TCP_TX_DELAY enabled\n"); | |
3310 | } | |
3311 | } | |
3312 | } | |
3313 | ||
db10538a CH |
3314 | /* When set indicates to always queue non-full frames. Later the user clears |
3315 | * this option and we transmit any pending partial frames in the queue. This is | |
3316 | * meant to be used alongside sendfile() to get properly filled frames when the | |
3317 | * user (for example) must write out headers with a write() call first and then | |
3318 | * use sendfile to send out the data parts. | |
3319 | * | |
3320 | * TCP_CORK can be set together with TCP_NODELAY and it is stronger than | |
3321 | * TCP_NODELAY. | |
3322 | */ | |
6fadaa56 | 3323 | void __tcp_sock_set_cork(struct sock *sk, bool on) |
db10538a CH |
3324 | { |
3325 | struct tcp_sock *tp = tcp_sk(sk); | |
3326 | ||
3327 | if (on) { | |
3328 | tp->nonagle |= TCP_NAGLE_CORK; | |
3329 | } else { | |
3330 | tp->nonagle &= ~TCP_NAGLE_CORK; | |
3331 | if (tp->nonagle & TCP_NAGLE_OFF) | |
3332 | tp->nonagle |= TCP_NAGLE_PUSH; | |
3333 | tcp_push_pending_frames(sk); | |
3334 | } | |
3335 | } | |
3336 | ||
3337 | void tcp_sock_set_cork(struct sock *sk, bool on) | |
3338 | { | |
3339 | lock_sock(sk); | |
3340 | __tcp_sock_set_cork(sk, on); | |
3341 | release_sock(sk); | |
3342 | } | |
3343 | EXPORT_SYMBOL(tcp_sock_set_cork); | |
3344 | ||
12abc5ee CH |
3345 | /* TCP_NODELAY is weaker than TCP_CORK, so that this option on corked socket is |
3346 | * remembered, but it is not activated until cork is cleared. | |
3347 | * | |
3348 | * However, when TCP_NODELAY is set we make an explicit push, which overrides | |
3349 | * even TCP_CORK for currently queued segments. | |
3350 | */ | |
6fadaa56 | 3351 | void __tcp_sock_set_nodelay(struct sock *sk, bool on) |
12abc5ee CH |
3352 | { |
3353 | if (on) { | |
3354 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; | |
3355 | tcp_push_pending_frames(sk); | |
3356 | } else { | |
3357 | tcp_sk(sk)->nonagle &= ~TCP_NAGLE_OFF; | |
3358 | } | |
3359 | } | |
3360 | ||
3361 | void tcp_sock_set_nodelay(struct sock *sk) | |
3362 | { | |
3363 | lock_sock(sk); | |
3364 | __tcp_sock_set_nodelay(sk, true); | |
3365 | release_sock(sk); | |
3366 | } | |
3367 | EXPORT_SYMBOL(tcp_sock_set_nodelay); | |
3368 | ||
ddd061b8 CH |
3369 | static void __tcp_sock_set_quickack(struct sock *sk, int val) |
3370 | { | |
3371 | if (!val) { | |
3372 | inet_csk_enter_pingpong_mode(sk); | |
3373 | return; | |
3374 | } | |
3375 | ||
3376 | inet_csk_exit_pingpong_mode(sk); | |
3377 | if ((1 << sk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && | |
3378 | inet_csk_ack_scheduled(sk)) { | |
3379 | inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_PUSHED; | |
3380 | tcp_cleanup_rbuf(sk, 1); | |
3381 | if (!(val & 1)) | |
3382 | inet_csk_enter_pingpong_mode(sk); | |
3383 | } | |
3384 | } | |
3385 | ||
3386 | void tcp_sock_set_quickack(struct sock *sk, int val) | |
3387 | { | |
3388 | lock_sock(sk); | |
3389 | __tcp_sock_set_quickack(sk, val); | |
3390 | release_sock(sk); | |
3391 | } | |
3392 | EXPORT_SYMBOL(tcp_sock_set_quickack); | |
3393 | ||
557eadfc CH |
3394 | int tcp_sock_set_syncnt(struct sock *sk, int val) |
3395 | { | |
3396 | if (val < 1 || val > MAX_TCP_SYNCNT) | |
3397 | return -EINVAL; | |
3398 | ||
3399 | lock_sock(sk); | |
3400 | inet_csk(sk)->icsk_syn_retries = val; | |
3401 | release_sock(sk); | |
3402 | return 0; | |
3403 | } | |
3404 | EXPORT_SYMBOL(tcp_sock_set_syncnt); | |
3405 | ||
c488aead CH |
3406 | void tcp_sock_set_user_timeout(struct sock *sk, u32 val) |
3407 | { | |
3408 | lock_sock(sk); | |
3409 | inet_csk(sk)->icsk_user_timeout = val; | |
3410 | release_sock(sk); | |
3411 | } | |
3412 | EXPORT_SYMBOL(tcp_sock_set_user_timeout); | |
3413 | ||
aad4a0a9 | 3414 | int tcp_sock_set_keepidle_locked(struct sock *sk, int val) |
71c48eb8 CH |
3415 | { |
3416 | struct tcp_sock *tp = tcp_sk(sk); | |
3417 | ||
3418 | if (val < 1 || val > MAX_TCP_KEEPIDLE) | |
3419 | return -EINVAL; | |
3420 | ||
3421 | tp->keepalive_time = val * HZ; | |
3422 | if (sock_flag(sk, SOCK_KEEPOPEN) && | |
3423 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
3424 | u32 elapsed = keepalive_time_elapsed(tp); | |
3425 | ||
3426 | if (tp->keepalive_time > elapsed) | |
3427 | elapsed = tp->keepalive_time - elapsed; | |
3428 | else | |
3429 | elapsed = 0; | |
3430 | inet_csk_reset_keepalive_timer(sk, elapsed); | |
3431 | } | |
3432 | ||
3433 | return 0; | |
3434 | } | |
3435 | ||
3436 | int tcp_sock_set_keepidle(struct sock *sk, int val) | |
3437 | { | |
3438 | int err; | |
3439 | ||
3440 | lock_sock(sk); | |
aad4a0a9 | 3441 | err = tcp_sock_set_keepidle_locked(sk, val); |
71c48eb8 CH |
3442 | release_sock(sk); |
3443 | return err; | |
3444 | } | |
3445 | EXPORT_SYMBOL(tcp_sock_set_keepidle); | |
3446 | ||
d41ecaac CH |
3447 | int tcp_sock_set_keepintvl(struct sock *sk, int val) |
3448 | { | |
3449 | if (val < 1 || val > MAX_TCP_KEEPINTVL) | |
3450 | return -EINVAL; | |
3451 | ||
3452 | lock_sock(sk); | |
3453 | tcp_sk(sk)->keepalive_intvl = val * HZ; | |
3454 | release_sock(sk); | |
3455 | return 0; | |
3456 | } | |
3457 | EXPORT_SYMBOL(tcp_sock_set_keepintvl); | |
3458 | ||
480aeb96 CH |
3459 | int tcp_sock_set_keepcnt(struct sock *sk, int val) |
3460 | { | |
3461 | if (val < 1 || val > MAX_TCP_KEEPCNT) | |
3462 | return -EINVAL; | |
3463 | ||
3464 | lock_sock(sk); | |
3465 | tcp_sk(sk)->keepalive_probes = val; | |
3466 | release_sock(sk); | |
3467 | return 0; | |
3468 | } | |
3469 | EXPORT_SYMBOL(tcp_sock_set_keepcnt); | |
3470 | ||
cb811109 P |
3471 | int tcp_set_window_clamp(struct sock *sk, int val) |
3472 | { | |
3473 | struct tcp_sock *tp = tcp_sk(sk); | |
3474 | ||
3475 | if (!val) { | |
3476 | if (sk->sk_state != TCP_CLOSE) | |
3477 | return -EINVAL; | |
3478 | tp->window_clamp = 0; | |
3479 | } else { | |
3480 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? | |
3481 | SOCK_MIN_RCVBUF / 2 : val; | |
3aa7857f | 3482 | tp->rcv_ssthresh = min(tp->rcv_wnd, tp->window_clamp); |
cb811109 P |
3483 | } |
3484 | return 0; | |
3485 | } | |
3486 | ||
1da177e4 LT |
3487 | /* |
3488 | * Socket option code for TCP. | |
3489 | */ | |
0c751f70 MKL |
3490 | int do_tcp_setsockopt(struct sock *sk, int level, int optname, |
3491 | sockptr_t optval, unsigned int optlen) | |
1da177e4 LT |
3492 | { |
3493 | struct tcp_sock *tp = tcp_sk(sk); | |
463c84b9 | 3494 | struct inet_connection_sock *icsk = inet_csk(sk); |
1e579caa | 3495 | struct net *net = sock_net(sk); |
1da177e4 LT |
3496 | int val; |
3497 | int err = 0; | |
3498 | ||
e56fb50f WAS |
3499 | /* These are data/string values, all the others are ints */ |
3500 | switch (optname) { | |
3501 | case TCP_CONGESTION: { | |
5f8ef48d SH |
3502 | char name[TCP_CA_NAME_MAX]; |
3503 | ||
3504 | if (optlen < 1) | |
3505 | return -EINVAL; | |
3506 | ||
d38d2b00 | 3507 | val = strncpy_from_sockptr(name, optval, |
4fdb78d3 | 3508 | min_t(long, TCP_CA_NAME_MAX-1, optlen)); |
5f8ef48d SH |
3509 | if (val < 0) |
3510 | return -EFAULT; | |
3511 | name[val] = 0; | |
3512 | ||
cb388e7e | 3513 | sockopt_lock_sock(sk); |
84e5a0f2 | 3514 | err = tcp_set_congestion_control(sk, name, !has_current_bpf_ctx(), |
cb388e7e MKL |
3515 | sockopt_ns_capable(sock_net(sk)->user_ns, |
3516 | CAP_NET_ADMIN)); | |
3517 | sockopt_release_sock(sk); | |
5f8ef48d SH |
3518 | return err; |
3519 | } | |
734942cc DW |
3520 | case TCP_ULP: { |
3521 | char name[TCP_ULP_NAME_MAX]; | |
3522 | ||
3523 | if (optlen < 1) | |
3524 | return -EINVAL; | |
3525 | ||
d38d2b00 | 3526 | val = strncpy_from_sockptr(name, optval, |
734942cc DW |
3527 | min_t(long, TCP_ULP_NAME_MAX - 1, |
3528 | optlen)); | |
3529 | if (val < 0) | |
3530 | return -EFAULT; | |
3531 | name[val] = 0; | |
3532 | ||
cb388e7e | 3533 | sockopt_lock_sock(sk); |
734942cc | 3534 | err = tcp_set_ulp(sk, name); |
cb388e7e | 3535 | sockopt_release_sock(sk); |
734942cc DW |
3536 | return err; |
3537 | } | |
1fba70e5 | 3538 | case TCP_FASTOPEN_KEY: { |
0f1ce023 JB |
3539 | __u8 key[TCP_FASTOPEN_KEY_BUF_LENGTH]; |
3540 | __u8 *backup_key = NULL; | |
1fba70e5 | 3541 | |
0f1ce023 JB |
3542 | /* Allow a backup key as well to facilitate key rotation |
3543 | * First key is the active one. | |
3544 | */ | |
3545 | if (optlen != TCP_FASTOPEN_KEY_LENGTH && | |
3546 | optlen != TCP_FASTOPEN_KEY_BUF_LENGTH) | |
1fba70e5 YC |
3547 | return -EINVAL; |
3548 | ||
d38d2b00 | 3549 | if (copy_from_sockptr(key, optval, optlen)) |
1fba70e5 YC |
3550 | return -EFAULT; |
3551 | ||
0f1ce023 JB |
3552 | if (optlen == TCP_FASTOPEN_KEY_BUF_LENGTH) |
3553 | backup_key = key + TCP_FASTOPEN_KEY_LENGTH; | |
3554 | ||
438ac880 | 3555 | return tcp_fastopen_reset_cipher(net, sk, key, backup_key); |
1fba70e5 | 3556 | } |
e56fb50f WAS |
3557 | default: |
3558 | /* fallthru */ | |
3559 | break; | |
ccbd6a5a | 3560 | } |
5f8ef48d | 3561 | |
1da177e4 LT |
3562 | if (optlen < sizeof(int)) |
3563 | return -EINVAL; | |
3564 | ||
d38d2b00 | 3565 | if (copy_from_sockptr(&val, optval, sizeof(val))) |
1da177e4 LT |
3566 | return -EFAULT; |
3567 | ||
cb388e7e | 3568 | sockopt_lock_sock(sk); |
1da177e4 LT |
3569 | |
3570 | switch (optname) { | |
3571 | case TCP_MAXSEG: | |
3572 | /* Values greater than interface MTU won't take effect. However | |
3573 | * at the point when this call is done we typically don't yet | |
a777f715 RC |
3574 | * know which interface is going to be used |
3575 | */ | |
cfc62d87 | 3576 | if (val && (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW)) { |
1da177e4 LT |
3577 | err = -EINVAL; |
3578 | break; | |
3579 | } | |
3580 | tp->rx_opt.user_mss = val; | |
3581 | break; | |
3582 | ||
3583 | case TCP_NODELAY: | |
12abc5ee | 3584 | __tcp_sock_set_nodelay(sk, val); |
1da177e4 LT |
3585 | break; |
3586 | ||
36e31b0a AP |
3587 | case TCP_THIN_LINEAR_TIMEOUTS: |
3588 | if (val < 0 || val > 1) | |
3589 | err = -EINVAL; | |
3590 | else | |
3591 | tp->thin_lto = val; | |
3592 | break; | |
3593 | ||
7e380175 AP |
3594 | case TCP_THIN_DUPACK: |
3595 | if (val < 0 || val > 1) | |
3596 | err = -EINVAL; | |
7e380175 AP |
3597 | break; |
3598 | ||
ee995283 PE |
3599 | case TCP_REPAIR: |
3600 | if (!tcp_can_repair_sock(sk)) | |
3601 | err = -EPERM; | |
31048d7a | 3602 | else if (val == TCP_REPAIR_ON) { |
ee995283 PE |
3603 | tp->repair = 1; |
3604 | sk->sk_reuse = SK_FORCE_REUSE; | |
3605 | tp->repair_queue = TCP_NO_QUEUE; | |
31048d7a | 3606 | } else if (val == TCP_REPAIR_OFF) { |
ee995283 PE |
3607 | tp->repair = 0; |
3608 | sk->sk_reuse = SK_NO_REUSE; | |
3609 | tcp_send_window_probe(sk); | |
31048d7a | 3610 | } else if (val == TCP_REPAIR_OFF_NO_WP) { |
ee995283 PE |
3611 | tp->repair = 0; |
3612 | sk->sk_reuse = SK_NO_REUSE; | |
ee995283 PE |
3613 | } else |
3614 | err = -EINVAL; | |
3615 | ||
3616 | break; | |
3617 | ||
3618 | case TCP_REPAIR_QUEUE: | |
3619 | if (!tp->repair) | |
3620 | err = -EPERM; | |
bf2acc94 | 3621 | else if ((unsigned int)val < TCP_QUEUES_NR) |
ee995283 PE |
3622 | tp->repair_queue = val; |
3623 | else | |
3624 | err = -EINVAL; | |
3625 | break; | |
3626 | ||
3627 | case TCP_QUEUE_SEQ: | |
8811f4a9 | 3628 | if (sk->sk_state != TCP_CLOSE) { |
ee995283 | 3629 | err = -EPERM; |
8811f4a9 ED |
3630 | } else if (tp->repair_queue == TCP_SEND_QUEUE) { |
3631 | if (!tcp_rtx_queue_empty(sk)) | |
3632 | err = -EPERM; | |
3633 | else | |
3634 | WRITE_ONCE(tp->write_seq, val); | |
3635 | } else if (tp->repair_queue == TCP_RECV_QUEUE) { | |
3636 | if (tp->rcv_nxt != tp->copied_seq) { | |
3637 | err = -EPERM; | |
3638 | } else { | |
3639 | WRITE_ONCE(tp->rcv_nxt, val); | |
3640 | WRITE_ONCE(tp->copied_seq, val); | |
3641 | } | |
3642 | } else { | |
ee995283 | 3643 | err = -EINVAL; |
8811f4a9 | 3644 | } |
ee995283 PE |
3645 | break; |
3646 | ||
b139ba4e PE |
3647 | case TCP_REPAIR_OPTIONS: |
3648 | if (!tp->repair) | |
3649 | err = -EINVAL; | |
0c175da7 | 3650 | else if (sk->sk_state == TCP_ESTABLISHED && !tp->bytes_sent) |
d38d2b00 | 3651 | err = tcp_repair_options_est(sk, optval, optlen); |
b139ba4e PE |
3652 | else |
3653 | err = -EPERM; | |
3654 | break; | |
3655 | ||
1da177e4 | 3656 | case TCP_CORK: |
db10538a | 3657 | __tcp_sock_set_cork(sk, val); |
1da177e4 LT |
3658 | break; |
3659 | ||
3660 | case TCP_KEEPIDLE: | |
aad4a0a9 | 3661 | err = tcp_sock_set_keepidle_locked(sk, val); |
1da177e4 LT |
3662 | break; |
3663 | case TCP_KEEPINTVL: | |
3664 | if (val < 1 || val > MAX_TCP_KEEPINTVL) | |
3665 | err = -EINVAL; | |
3666 | else | |
3667 | tp->keepalive_intvl = val * HZ; | |
3668 | break; | |
3669 | case TCP_KEEPCNT: | |
3670 | if (val < 1 || val > MAX_TCP_KEEPCNT) | |
3671 | err = -EINVAL; | |
3672 | else | |
3673 | tp->keepalive_probes = val; | |
3674 | break; | |
3675 | case TCP_SYNCNT: | |
3676 | if (val < 1 || val > MAX_TCP_SYNCNT) | |
3677 | err = -EINVAL; | |
3678 | else | |
463c84b9 | 3679 | icsk->icsk_syn_retries = val; |
1da177e4 LT |
3680 | break; |
3681 | ||
cd8ae852 | 3682 | case TCP_SAVE_SYN: |
267cf9fa MKL |
3683 | /* 0: disable, 1: enable, 2: start from ether_header */ |
3684 | if (val < 0 || val > 2) | |
cd8ae852 ED |
3685 | err = -EINVAL; |
3686 | else | |
3687 | tp->save_syn = val; | |
3688 | break; | |
3689 | ||
1da177e4 LT |
3690 | case TCP_LINGER2: |
3691 | if (val < 0) | |
3692 | tp->linger2 = -1; | |
f0628c52 CZ |
3693 | else if (val > TCP_FIN_TIMEOUT_MAX / HZ) |
3694 | tp->linger2 = TCP_FIN_TIMEOUT_MAX; | |
1da177e4 LT |
3695 | else |
3696 | tp->linger2 = val * HZ; | |
3697 | break; | |
3698 | ||
3699 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
3700 | /* Translate value in seconds to number of retransmits */ |
3701 | icsk->icsk_accept_queue.rskq_defer_accept = | |
3702 | secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ, | |
3703 | TCP_RTO_MAX / HZ); | |
1da177e4 LT |
3704 | break; |
3705 | ||
3706 | case TCP_WINDOW_CLAMP: | |
cb811109 | 3707 | err = tcp_set_window_clamp(sk, val); |
1da177e4 LT |
3708 | break; |
3709 | ||
3710 | case TCP_QUICKACK: | |
ddd061b8 | 3711 | __tcp_sock_set_quickack(sk, val); |
1da177e4 LT |
3712 | break; |
3713 | ||
cfb6eeb4 YH |
3714 | #ifdef CONFIG_TCP_MD5SIG |
3715 | case TCP_MD5SIG: | |
8917a777 | 3716 | case TCP_MD5SIG_EXT: |
d38d2b00 | 3717 | err = tp->af_specific->md5_parse(sk, optname, optval, optlen); |
cfb6eeb4 YH |
3718 | break; |
3719 | #endif | |
dca43c75 | 3720 | case TCP_USER_TIMEOUT: |
b248230c | 3721 | /* Cap the max time in ms TCP will retry or probe the window |
dca43c75 JC |
3722 | * before giving up and aborting (ETIMEDOUT) a connection. |
3723 | */ | |
42493570 HL |
3724 | if (val < 0) |
3725 | err = -EINVAL; | |
3726 | else | |
9bcc66e1 | 3727 | icsk->icsk_user_timeout = val; |
dca43c75 | 3728 | break; |
8336886f JC |
3729 | |
3730 | case TCP_FASTOPEN: | |
3731 | if (val >= 0 && ((1 << sk->sk_state) & (TCPF_CLOSE | | |
dfea2aa6 | 3732 | TCPF_LISTEN))) { |
43713848 | 3733 | tcp_fastopen_init_key_once(net); |
dfea2aa6 | 3734 | |
0536fcc0 | 3735 | fastopen_queue_tune(sk, val); |
dfea2aa6 | 3736 | } else { |
8336886f | 3737 | err = -EINVAL; |
dfea2aa6 | 3738 | } |
8336886f | 3739 | break; |
19f6d3f3 WW |
3740 | case TCP_FASTOPEN_CONNECT: |
3741 | if (val > 1 || val < 0) { | |
3742 | err = -EINVAL; | |
5a542133 KI |
3743 | } else if (READ_ONCE(net->ipv4.sysctl_tcp_fastopen) & |
3744 | TFO_CLIENT_ENABLE) { | |
19f6d3f3 WW |
3745 | if (sk->sk_state == TCP_CLOSE) |
3746 | tp->fastopen_connect = val; | |
3747 | else | |
3748 | err = -EINVAL; | |
3749 | } else { | |
3750 | err = -EOPNOTSUPP; | |
3751 | } | |
3752 | break; | |
71c02379 CP |
3753 | case TCP_FASTOPEN_NO_COOKIE: |
3754 | if (val > 1 || val < 0) | |
3755 | err = -EINVAL; | |
3756 | else if (!((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) | |
3757 | err = -EINVAL; | |
3758 | else | |
3759 | tp->fastopen_no_cookie = val; | |
3760 | break; | |
93be6ce0 AV |
3761 | case TCP_TIMESTAMP: |
3762 | if (!tp->repair) | |
3763 | err = -EPERM; | |
3764 | else | |
9a568de4 | 3765 | tp->tsoffset = val - tcp_time_stamp_raw(); |
93be6ce0 | 3766 | break; |
b1ed4c4f AV |
3767 | case TCP_REPAIR_WINDOW: |
3768 | err = tcp_repair_set_window(tp, optval, optlen); | |
3769 | break; | |
c9bee3b7 ED |
3770 | case TCP_NOTSENT_LOWAT: |
3771 | tp->notsent_lowat = val; | |
3772 | sk->sk_write_space(sk); | |
3773 | break; | |
b75eba76 SHY |
3774 | case TCP_INQ: |
3775 | if (val > 1 || val < 0) | |
3776 | err = -EINVAL; | |
3777 | else | |
3778 | tp->recvmsg_inq = val; | |
3779 | break; | |
a842fe14 ED |
3780 | case TCP_TX_DELAY: |
3781 | if (val) | |
3782 | tcp_enable_tx_delay(); | |
3783 | tp->tcp_tx_delay = val; | |
3784 | break; | |
1da177e4 LT |
3785 | default: |
3786 | err = -ENOPROTOOPT; | |
3787 | break; | |
3ff50b79 SH |
3788 | } |
3789 | ||
cb388e7e | 3790 | sockopt_release_sock(sk); |
1da177e4 LT |
3791 | return err; |
3792 | } | |
3793 | ||
a7b75c5a | 3794 | int tcp_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
b7058842 | 3795 | unsigned int optlen) |
3fdadf7d | 3796 | { |
cf533ea5 | 3797 | const struct inet_connection_sock *icsk = inet_csk(sk); |
3fdadf7d DM |
3798 | |
3799 | if (level != SOL_TCP) | |
f49cd2f4 KI |
3800 | /* Paired with WRITE_ONCE() in do_ipv6_setsockopt() and tcp_v6_connect() */ |
3801 | return READ_ONCE(icsk->icsk_af_ops)->setsockopt(sk, level, optname, | |
3802 | optval, optlen); | |
a7b75c5a | 3803 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d | 3804 | } |
4bc2f18b | 3805 | EXPORT_SYMBOL(tcp_setsockopt); |
3fdadf7d | 3806 | |
efd90174 FY |
3807 | static void tcp_get_info_chrono_stats(const struct tcp_sock *tp, |
3808 | struct tcp_info *info) | |
3809 | { | |
3810 | u64 stats[__TCP_CHRONO_MAX], total = 0; | |
3811 | enum tcp_chrono i; | |
3812 | ||
3813 | for (i = TCP_CHRONO_BUSY; i < __TCP_CHRONO_MAX; ++i) { | |
3814 | stats[i] = tp->chrono_stat[i - 1]; | |
3815 | if (i == tp->chrono_type) | |
628174cc | 3816 | stats[i] += tcp_jiffies32 - tp->chrono_start; |
efd90174 FY |
3817 | stats[i] *= USEC_PER_SEC / HZ; |
3818 | total += stats[i]; | |
3819 | } | |
3820 | ||
3821 | info->tcpi_busy_time = total; | |
3822 | info->tcpi_rwnd_limited = stats[TCP_CHRONO_RWND_LIMITED]; | |
3823 | info->tcpi_sndbuf_limited = stats[TCP_CHRONO_SNDBUF_LIMITED]; | |
3824 | } | |
3825 | ||
1da177e4 | 3826 | /* Return information about state of tcp endpoint in API format. */ |
0df48c26 | 3827 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
1da177e4 | 3828 | { |
35ac838a | 3829 | const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */ |
463c84b9 | 3830 | const struct inet_connection_sock *icsk = inet_csk(sk); |
76a9ebe8 | 3831 | unsigned long rate; |
0263598c | 3832 | u32 now; |
ff5d7497 | 3833 | u64 rate64; |
67db3e4b | 3834 | bool slow; |
1da177e4 LT |
3835 | |
3836 | memset(info, 0, sizeof(*info)); | |
35ac838a CG |
3837 | if (sk->sk_type != SOCK_STREAM) |
3838 | return; | |
1da177e4 | 3839 | |
986ffdfd | 3840 | info->tcpi_state = inet_sk_state_load(sk); |
00fd38d9 | 3841 | |
ccbf3bfa ED |
3842 | /* Report meaningful fields for all TCP states, including listeners */ |
3843 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 3844 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3845 | info->tcpi_pacing_rate = rate64; |
ccbf3bfa ED |
3846 | |
3847 | rate = READ_ONCE(sk->sk_max_pacing_rate); | |
76a9ebe8 | 3848 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
f522a5fc | 3849 | info->tcpi_max_pacing_rate = rate64; |
ccbf3bfa ED |
3850 | |
3851 | info->tcpi_reordering = tp->reordering; | |
40570375 | 3852 | info->tcpi_snd_cwnd = tcp_snd_cwnd(tp); |
ccbf3bfa ED |
3853 | |
3854 | if (info->tcpi_state == TCP_LISTEN) { | |
3855 | /* listeners aliased fields : | |
3856 | * tcpi_unacked -> Number of children ready for accept() | |
3857 | * tcpi_sacked -> max backlog | |
3858 | */ | |
288efe86 | 3859 | info->tcpi_unacked = READ_ONCE(sk->sk_ack_backlog); |
099ecf59 | 3860 | info->tcpi_sacked = READ_ONCE(sk->sk_max_ack_backlog); |
ccbf3bfa ED |
3861 | return; |
3862 | } | |
b369e7fd ED |
3863 | |
3864 | slow = lock_sock_fast(sk); | |
3865 | ||
6687e988 | 3866 | info->tcpi_ca_state = icsk->icsk_ca_state; |
463c84b9 | 3867 | info->tcpi_retransmits = icsk->icsk_retransmits; |
6687e988 | 3868 | info->tcpi_probes = icsk->icsk_probes_out; |
463c84b9 | 3869 | info->tcpi_backoff = icsk->icsk_backoff; |
1da177e4 LT |
3870 | |
3871 | if (tp->rx_opt.tstamp_ok) | |
3872 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; | |
e60402d0 | 3873 | if (tcp_is_sack(tp)) |
1da177e4 LT |
3874 | info->tcpi_options |= TCPI_OPT_SACK; |
3875 | if (tp->rx_opt.wscale_ok) { | |
3876 | info->tcpi_options |= TCPI_OPT_WSCALE; | |
3877 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; | |
3878 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; | |
e905a9ed | 3879 | } |
1da177e4 | 3880 | |
b5c5693b | 3881 | if (tp->ecn_flags & TCP_ECN_OK) |
1da177e4 | 3882 | info->tcpi_options |= TCPI_OPT_ECN; |
b5c5693b ED |
3883 | if (tp->ecn_flags & TCP_ECN_SEEN) |
3884 | info->tcpi_options |= TCPI_OPT_ECN_SEEN; | |
6f73601e YC |
3885 | if (tp->syn_data_acked) |
3886 | info->tcpi_options |= TCPI_OPT_SYN_DATA; | |
1da177e4 | 3887 | |
463c84b9 ACM |
3888 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
3889 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); | |
c1b4a7e6 | 3890 | info->tcpi_snd_mss = tp->mss_cache; |
463c84b9 | 3891 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
1da177e4 | 3892 | |
ccbf3bfa ED |
3893 | info->tcpi_unacked = tp->packets_out; |
3894 | info->tcpi_sacked = tp->sacked_out; | |
3895 | ||
1da177e4 LT |
3896 | info->tcpi_lost = tp->lost_out; |
3897 | info->tcpi_retrans = tp->retrans_out; | |
1da177e4 | 3898 | |
d635fbe2 | 3899 | now = tcp_jiffies32; |
1da177e4 | 3900 | info->tcpi_last_data_sent = jiffies_to_msecs(now - tp->lsndtime); |
463c84b9 | 3901 | info->tcpi_last_data_recv = jiffies_to_msecs(now - icsk->icsk_ack.lrcvtime); |
1da177e4 LT |
3902 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
3903 | ||
d83d8461 | 3904 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
1da177e4 | 3905 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
740b0f18 ED |
3906 | info->tcpi_rtt = tp->srtt_us >> 3; |
3907 | info->tcpi_rttvar = tp->mdev_us >> 2; | |
1da177e4 | 3908 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
1da177e4 | 3909 | info->tcpi_advmss = tp->advmss; |
1da177e4 | 3910 | |
645f4c6f | 3911 | info->tcpi_rcv_rtt = tp->rcv_rtt_est.rtt_us >> 3; |
1da177e4 LT |
3912 | info->tcpi_rcv_space = tp->rcvq_space.space; |
3913 | ||
3914 | info->tcpi_total_retrans = tp->total_retrans; | |
977cb0ec | 3915 | |
f522a5fc ED |
3916 | info->tcpi_bytes_acked = tp->bytes_acked; |
3917 | info->tcpi_bytes_received = tp->bytes_received; | |
67db3e4b | 3918 | info->tcpi_notsent_bytes = max_t(int, 0, tp->write_seq - tp->snd_nxt); |
efd90174 | 3919 | tcp_get_info_chrono_stats(tp, info); |
67db3e4b | 3920 | |
2efd055c | 3921 | info->tcpi_segs_out = tp->segs_out; |
0307a0b7 ED |
3922 | |
3923 | /* segs_in and data_segs_in can be updated from tcp_segs_in() from BH */ | |
3924 | info->tcpi_segs_in = READ_ONCE(tp->segs_in); | |
3925 | info->tcpi_data_segs_in = READ_ONCE(tp->data_segs_in); | |
cd9b2660 | 3926 | |
cd9b2660 | 3927 | info->tcpi_min_rtt = tcp_min_rtt(tp); |
a44d6eac | 3928 | info->tcpi_data_segs_out = tp->data_segs_out; |
eb8329e0 YC |
3929 | |
3930 | info->tcpi_delivery_rate_app_limited = tp->rate_app_limited ? 1 : 0; | |
0263598c WW |
3931 | rate64 = tcp_compute_delivery_rate(tp); |
3932 | if (rate64) | |
f522a5fc | 3933 | info->tcpi_delivery_rate = rate64; |
feb5f2ec YC |
3934 | info->tcpi_delivered = tp->delivered; |
3935 | info->tcpi_delivered_ce = tp->delivered_ce; | |
ba113c3a | 3936 | info->tcpi_bytes_sent = tp->bytes_sent; |
fb31c9b9 | 3937 | info->tcpi_bytes_retrans = tp->bytes_retrans; |
7e10b655 | 3938 | info->tcpi_dsack_dups = tp->dsack_dups; |
7ec65372 | 3939 | info->tcpi_reord_seen = tp->reord_seen; |
f9af2dbb | 3940 | info->tcpi_rcv_ooopack = tp->rcv_ooopack; |
8f7baad7 | 3941 | info->tcpi_snd_wnd = tp->snd_wnd; |
48027478 | 3942 | info->tcpi_fastopen_client_fail = tp->fastopen_client_fail; |
b369e7fd | 3943 | unlock_sock_fast(sk, slow); |
1da177e4 | 3944 | } |
1da177e4 LT |
3945 | EXPORT_SYMBOL_GPL(tcp_get_info); |
3946 | ||
984988aa WW |
3947 | static size_t tcp_opt_stats_get_size(void) |
3948 | { | |
3949 | return | |
3950 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BUSY */ | |
3951 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_RWND_LIMITED */ | |
3952 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_SNDBUF_LIMITED */ | |
3953 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DATA_SEGS_OUT */ | |
3954 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_TOTAL_RETRANS */ | |
3955 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_PACING_RATE */ | |
3956 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_DELIVERY_RATE */ | |
3957 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_CWND */ | |
3958 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORDERING */ | |
3959 | nla_total_size(sizeof(u32)) + /* TCP_NLA_MIN_RTT */ | |
3960 | nla_total_size(sizeof(u8)) + /* TCP_NLA_RECUR_RETRANS */ | |
3961 | nla_total_size(sizeof(u8)) + /* TCP_NLA_DELIVERY_RATE_APP_LMT */ | |
3962 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SNDQ_SIZE */ | |
3963 | nla_total_size(sizeof(u8)) + /* TCP_NLA_CA_STATE */ | |
3964 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SND_SSTHRESH */ | |
3965 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED */ | |
3966 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DELIVERED_CE */ | |
ba113c3a | 3967 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_SENT */ |
fb31c9b9 | 3968 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_BYTES_RETRANS */ |
7e10b655 | 3969 | nla_total_size(sizeof(u32)) + /* TCP_NLA_DSACK_DUPS */ |
7ec65372 | 3970 | nla_total_size(sizeof(u32)) + /* TCP_NLA_REORD_SEEN */ |
e8bd8fca | 3971 | nla_total_size(sizeof(u32)) + /* TCP_NLA_SRTT */ |
32efcc06 | 3972 | nla_total_size(sizeof(u16)) + /* TCP_NLA_TIMEOUT_REHASH */ |
e08ab0b3 | 3973 | nla_total_size(sizeof(u32)) + /* TCP_NLA_BYTES_NOTSENT */ |
48040793 | 3974 | nla_total_size_64bit(sizeof(u64)) + /* TCP_NLA_EDT */ |
e7ed11ee | 3975 | nla_total_size(sizeof(u8)) + /* TCP_NLA_TTL */ |
984988aa WW |
3976 | 0; |
3977 | } | |
3978 | ||
e7ed11ee YS |
3979 | /* Returns TTL or hop limit of an incoming packet from skb. */ |
3980 | static u8 tcp_skb_ttl_or_hop_limit(const struct sk_buff *skb) | |
3981 | { | |
3982 | if (skb->protocol == htons(ETH_P_IP)) | |
3983 | return ip_hdr(skb)->ttl; | |
3984 | else if (skb->protocol == htons(ETH_P_IPV6)) | |
3985 | return ipv6_hdr(skb)->hop_limit; | |
3986 | else | |
3987 | return 0; | |
3988 | } | |
3989 | ||
48040793 | 3990 | struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk, |
e7ed11ee YS |
3991 | const struct sk_buff *orig_skb, |
3992 | const struct sk_buff *ack_skb) | |
1c885808 FY |
3993 | { |
3994 | const struct tcp_sock *tp = tcp_sk(sk); | |
3995 | struct sk_buff *stats; | |
3996 | struct tcp_info info; | |
76a9ebe8 | 3997 | unsigned long rate; |
bb7c19f9 | 3998 | u64 rate64; |
1c885808 | 3999 | |
984988aa | 4000 | stats = alloc_skb(tcp_opt_stats_get_size(), GFP_ATOMIC); |
1c885808 FY |
4001 | if (!stats) |
4002 | return NULL; | |
4003 | ||
4004 | tcp_get_info_chrono_stats(tp, &info); | |
4005 | nla_put_u64_64bit(stats, TCP_NLA_BUSY, | |
4006 | info.tcpi_busy_time, TCP_NLA_PAD); | |
4007 | nla_put_u64_64bit(stats, TCP_NLA_RWND_LIMITED, | |
4008 | info.tcpi_rwnd_limited, TCP_NLA_PAD); | |
4009 | nla_put_u64_64bit(stats, TCP_NLA_SNDBUF_LIMITED, | |
4010 | info.tcpi_sndbuf_limited, TCP_NLA_PAD); | |
7e98102f YC |
4011 | nla_put_u64_64bit(stats, TCP_NLA_DATA_SEGS_OUT, |
4012 | tp->data_segs_out, TCP_NLA_PAD); | |
4013 | nla_put_u64_64bit(stats, TCP_NLA_TOTAL_RETRANS, | |
4014 | tp->total_retrans, TCP_NLA_PAD); | |
bb7c19f9 WW |
4015 | |
4016 | rate = READ_ONCE(sk->sk_pacing_rate); | |
76a9ebe8 | 4017 | rate64 = (rate != ~0UL) ? rate : ~0ULL; |
bb7c19f9 WW |
4018 | nla_put_u64_64bit(stats, TCP_NLA_PACING_RATE, rate64, TCP_NLA_PAD); |
4019 | ||
4020 | rate64 = tcp_compute_delivery_rate(tp); | |
4021 | nla_put_u64_64bit(stats, TCP_NLA_DELIVERY_RATE, rate64, TCP_NLA_PAD); | |
4022 | ||
40570375 | 4023 | nla_put_u32(stats, TCP_NLA_SND_CWND, tcp_snd_cwnd(tp)); |
bb7c19f9 WW |
4024 | nla_put_u32(stats, TCP_NLA_REORDERING, tp->reordering); |
4025 | nla_put_u32(stats, TCP_NLA_MIN_RTT, tcp_min_rtt(tp)); | |
4026 | ||
4027 | nla_put_u8(stats, TCP_NLA_RECUR_RETRANS, inet_csk(sk)->icsk_retransmits); | |
4028 | nla_put_u8(stats, TCP_NLA_DELIVERY_RATE_APP_LMT, !!tp->rate_app_limited); | |
7156d194 | 4029 | nla_put_u32(stats, TCP_NLA_SND_SSTHRESH, tp->snd_ssthresh); |
feb5f2ec YC |
4030 | nla_put_u32(stats, TCP_NLA_DELIVERED, tp->delivered); |
4031 | nla_put_u32(stats, TCP_NLA_DELIVERED_CE, tp->delivered_ce); | |
87ecc95d PJ |
4032 | |
4033 | nla_put_u32(stats, TCP_NLA_SNDQ_SIZE, tp->write_seq - tp->snd_una); | |
be631892 | 4034 | nla_put_u8(stats, TCP_NLA_CA_STATE, inet_csk(sk)->icsk_ca_state); |
feb5f2ec | 4035 | |
ba113c3a WW |
4036 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_SENT, tp->bytes_sent, |
4037 | TCP_NLA_PAD); | |
fb31c9b9 WW |
4038 | nla_put_u64_64bit(stats, TCP_NLA_BYTES_RETRANS, tp->bytes_retrans, |
4039 | TCP_NLA_PAD); | |
7e10b655 | 4040 | nla_put_u32(stats, TCP_NLA_DSACK_DUPS, tp->dsack_dups); |
7ec65372 | 4041 | nla_put_u32(stats, TCP_NLA_REORD_SEEN, tp->reord_seen); |
e8bd8fca | 4042 | nla_put_u32(stats, TCP_NLA_SRTT, tp->srtt_us >> 3); |
32efcc06 | 4043 | nla_put_u16(stats, TCP_NLA_TIMEOUT_REHASH, tp->timeout_rehash); |
e08ab0b3 YS |
4044 | nla_put_u32(stats, TCP_NLA_BYTES_NOTSENT, |
4045 | max_t(int, 0, tp->write_seq - tp->snd_nxt)); | |
48040793 YS |
4046 | nla_put_u64_64bit(stats, TCP_NLA_EDT, orig_skb->skb_mstamp_ns, |
4047 | TCP_NLA_PAD); | |
e7ed11ee YS |
4048 | if (ack_skb) |
4049 | nla_put_u8(stats, TCP_NLA_TTL, | |
4050 | tcp_skb_ttl_or_hop_limit(ack_skb)); | |
ba113c3a | 4051 | |
1c885808 FY |
4052 | return stats; |
4053 | } | |
4054 | ||
273b7f0f MKL |
4055 | int do_tcp_getsockopt(struct sock *sk, int level, |
4056 | int optname, sockptr_t optval, sockptr_t optlen) | |
1da177e4 | 4057 | { |
295f7324 | 4058 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 4059 | struct tcp_sock *tp = tcp_sk(sk); |
6fa25166 | 4060 | struct net *net = sock_net(sk); |
1da177e4 LT |
4061 | int val, len; |
4062 | ||
34704ef0 | 4063 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
1da177e4 LT |
4064 | return -EFAULT; |
4065 | ||
4066 | len = min_t(unsigned int, len, sizeof(int)); | |
4067 | ||
4068 | if (len < 0) | |
4069 | return -EINVAL; | |
4070 | ||
4071 | switch (optname) { | |
4072 | case TCP_MAXSEG: | |
c1b4a7e6 | 4073 | val = tp->mss_cache; |
1da177e4 LT |
4074 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
4075 | val = tp->rx_opt.user_mss; | |
5e6a3ce6 PE |
4076 | if (tp->repair) |
4077 | val = tp->rx_opt.mss_clamp; | |
1da177e4 LT |
4078 | break; |
4079 | case TCP_NODELAY: | |
4080 | val = !!(tp->nonagle&TCP_NAGLE_OFF); | |
4081 | break; | |
4082 | case TCP_CORK: | |
4083 | val = !!(tp->nonagle&TCP_NAGLE_CORK); | |
4084 | break; | |
4085 | case TCP_KEEPIDLE: | |
df19a626 | 4086 | val = keepalive_time_when(tp) / HZ; |
1da177e4 LT |
4087 | break; |
4088 | case TCP_KEEPINTVL: | |
df19a626 | 4089 | val = keepalive_intvl_when(tp) / HZ; |
1da177e4 LT |
4090 | break; |
4091 | case TCP_KEEPCNT: | |
df19a626 | 4092 | val = keepalive_probes(tp); |
1da177e4 LT |
4093 | break; |
4094 | case TCP_SYNCNT: | |
20a3b1c0 KI |
4095 | val = icsk->icsk_syn_retries ? : |
4096 | READ_ONCE(net->ipv4.sysctl_tcp_syn_retries); | |
1da177e4 LT |
4097 | break; |
4098 | case TCP_LINGER2: | |
4099 | val = tp->linger2; | |
4100 | if (val >= 0) | |
39e24435 | 4101 | val = (val ? : READ_ONCE(net->ipv4.sysctl_tcp_fin_timeout)) / HZ; |
1da177e4 LT |
4102 | break; |
4103 | case TCP_DEFER_ACCEPT: | |
b103cf34 JA |
4104 | val = retrans_to_secs(icsk->icsk_accept_queue.rskq_defer_accept, |
4105 | TCP_TIMEOUT_INIT / HZ, TCP_RTO_MAX / HZ); | |
1da177e4 LT |
4106 | break; |
4107 | case TCP_WINDOW_CLAMP: | |
4108 | val = tp->window_clamp; | |
4109 | break; | |
4110 | case TCP_INFO: { | |
4111 | struct tcp_info info; | |
4112 | ||
34704ef0 | 4113 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
1da177e4 LT |
4114 | return -EFAULT; |
4115 | ||
4116 | tcp_get_info(sk, &info); | |
4117 | ||
4118 | len = min_t(unsigned int, len, sizeof(info)); | |
34704ef0 | 4119 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
1da177e4 | 4120 | return -EFAULT; |
34704ef0 | 4121 | if (copy_to_sockptr(optval, &info, len)) |
1da177e4 LT |
4122 | return -EFAULT; |
4123 | return 0; | |
4124 | } | |
6e9250f5 ED |
4125 | case TCP_CC_INFO: { |
4126 | const struct tcp_congestion_ops *ca_ops; | |
4127 | union tcp_cc_info info; | |
4128 | size_t sz = 0; | |
4129 | int attr; | |
4130 | ||
34704ef0 | 4131 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
6e9250f5 ED |
4132 | return -EFAULT; |
4133 | ||
4134 | ca_ops = icsk->icsk_ca_ops; | |
4135 | if (ca_ops && ca_ops->get_info) | |
4136 | sz = ca_ops->get_info(sk, ~0U, &attr, &info); | |
4137 | ||
4138 | len = min_t(unsigned int, len, sz); | |
34704ef0 | 4139 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
6e9250f5 | 4140 | return -EFAULT; |
34704ef0 | 4141 | if (copy_to_sockptr(optval, &info, len)) |
6e9250f5 ED |
4142 | return -EFAULT; |
4143 | return 0; | |
4144 | } | |
1da177e4 | 4145 | case TCP_QUICKACK: |
31954cd8 | 4146 | val = !inet_csk_in_pingpong_mode(sk); |
1da177e4 | 4147 | break; |
5f8ef48d SH |
4148 | |
4149 | case TCP_CONGESTION: | |
34704ef0 | 4150 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
5f8ef48d SH |
4151 | return -EFAULT; |
4152 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); | |
34704ef0 | 4153 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
5f8ef48d | 4154 | return -EFAULT; |
34704ef0 | 4155 | if (copy_to_sockptr(optval, icsk->icsk_ca_ops->name, len)) |
5f8ef48d SH |
4156 | return -EFAULT; |
4157 | return 0; | |
e56fb50f | 4158 | |
734942cc | 4159 | case TCP_ULP: |
34704ef0 | 4160 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
734942cc DW |
4161 | return -EFAULT; |
4162 | len = min_t(unsigned int, len, TCP_ULP_NAME_MAX); | |
d97af30f | 4163 | if (!icsk->icsk_ulp_ops) { |
34704ef0 MKL |
4164 | len = 0; |
4165 | if (copy_to_sockptr(optlen, &len, sizeof(int))) | |
d97af30f DW |
4166 | return -EFAULT; |
4167 | return 0; | |
4168 | } | |
34704ef0 | 4169 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
734942cc | 4170 | return -EFAULT; |
34704ef0 | 4171 | if (copy_to_sockptr(optval, icsk->icsk_ulp_ops->name, len)) |
734942cc DW |
4172 | return -EFAULT; |
4173 | return 0; | |
4174 | ||
1fba70e5 | 4175 | case TCP_FASTOPEN_KEY: { |
f19008e6 JB |
4176 | u64 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u64)]; |
4177 | unsigned int key_len; | |
1fba70e5 | 4178 | |
34704ef0 | 4179 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
1fba70e5 YC |
4180 | return -EFAULT; |
4181 | ||
f19008e6 JB |
4182 | key_len = tcp_fastopen_get_cipher(net, icsk, key) * |
4183 | TCP_FASTOPEN_KEY_LENGTH; | |
0f1ce023 | 4184 | len = min_t(unsigned int, len, key_len); |
34704ef0 | 4185 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
1fba70e5 | 4186 | return -EFAULT; |
34704ef0 | 4187 | if (copy_to_sockptr(optval, key, len)) |
1fba70e5 YC |
4188 | return -EFAULT; |
4189 | return 0; | |
4190 | } | |
3c0fef0b JH |
4191 | case TCP_THIN_LINEAR_TIMEOUTS: |
4192 | val = tp->thin_lto; | |
4193 | break; | |
4a7f6009 | 4194 | |
3c0fef0b | 4195 | case TCP_THIN_DUPACK: |
4a7f6009 | 4196 | val = 0; |
3c0fef0b | 4197 | break; |
dca43c75 | 4198 | |
ee995283 PE |
4199 | case TCP_REPAIR: |
4200 | val = tp->repair; | |
4201 | break; | |
4202 | ||
4203 | case TCP_REPAIR_QUEUE: | |
4204 | if (tp->repair) | |
4205 | val = tp->repair_queue; | |
4206 | else | |
4207 | return -EINVAL; | |
4208 | break; | |
4209 | ||
b1ed4c4f AV |
4210 | case TCP_REPAIR_WINDOW: { |
4211 | struct tcp_repair_window opt; | |
4212 | ||
34704ef0 | 4213 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
b1ed4c4f AV |
4214 | return -EFAULT; |
4215 | ||
4216 | if (len != sizeof(opt)) | |
4217 | return -EINVAL; | |
4218 | ||
4219 | if (!tp->repair) | |
4220 | return -EPERM; | |
4221 | ||
4222 | opt.snd_wl1 = tp->snd_wl1; | |
4223 | opt.snd_wnd = tp->snd_wnd; | |
4224 | opt.max_window = tp->max_window; | |
4225 | opt.rcv_wnd = tp->rcv_wnd; | |
4226 | opt.rcv_wup = tp->rcv_wup; | |
4227 | ||
34704ef0 | 4228 | if (copy_to_sockptr(optval, &opt, len)) |
b1ed4c4f AV |
4229 | return -EFAULT; |
4230 | return 0; | |
4231 | } | |
ee995283 PE |
4232 | case TCP_QUEUE_SEQ: |
4233 | if (tp->repair_queue == TCP_SEND_QUEUE) | |
4234 | val = tp->write_seq; | |
4235 | else if (tp->repair_queue == TCP_RECV_QUEUE) | |
4236 | val = tp->rcv_nxt; | |
4237 | else | |
4238 | return -EINVAL; | |
4239 | break; | |
4240 | ||
dca43c75 | 4241 | case TCP_USER_TIMEOUT: |
9bcc66e1 | 4242 | val = icsk->icsk_user_timeout; |
dca43c75 | 4243 | break; |
1536e285 KN |
4244 | |
4245 | case TCP_FASTOPEN: | |
0536fcc0 | 4246 | val = icsk->icsk_accept_queue.fastopenq.max_qlen; |
1536e285 KN |
4247 | break; |
4248 | ||
19f6d3f3 WW |
4249 | case TCP_FASTOPEN_CONNECT: |
4250 | val = tp->fastopen_connect; | |
4251 | break; | |
4252 | ||
71c02379 CP |
4253 | case TCP_FASTOPEN_NO_COOKIE: |
4254 | val = tp->fastopen_no_cookie; | |
4255 | break; | |
4256 | ||
a842fe14 ED |
4257 | case TCP_TX_DELAY: |
4258 | val = tp->tcp_tx_delay; | |
4259 | break; | |
4260 | ||
93be6ce0 | 4261 | case TCP_TIMESTAMP: |
9a568de4 | 4262 | val = tcp_time_stamp_raw() + tp->tsoffset; |
93be6ce0 | 4263 | break; |
c9bee3b7 ED |
4264 | case TCP_NOTSENT_LOWAT: |
4265 | val = tp->notsent_lowat; | |
4266 | break; | |
b75eba76 SHY |
4267 | case TCP_INQ: |
4268 | val = tp->recvmsg_inq; | |
4269 | break; | |
cd8ae852 ED |
4270 | case TCP_SAVE_SYN: |
4271 | val = tp->save_syn; | |
4272 | break; | |
4273 | case TCP_SAVED_SYN: { | |
34704ef0 | 4274 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
cd8ae852 ED |
4275 | return -EFAULT; |
4276 | ||
d51bbff2 | 4277 | sockopt_lock_sock(sk); |
cd8ae852 | 4278 | if (tp->saved_syn) { |
70a217f1 | 4279 | if (len < tcp_saved_syn_len(tp->saved_syn)) { |
34704ef0 MKL |
4280 | len = tcp_saved_syn_len(tp->saved_syn); |
4281 | if (copy_to_sockptr(optlen, &len, sizeof(int))) { | |
d51bbff2 | 4282 | sockopt_release_sock(sk); |
aea0929e EM |
4283 | return -EFAULT; |
4284 | } | |
d51bbff2 | 4285 | sockopt_release_sock(sk); |
aea0929e EM |
4286 | return -EINVAL; |
4287 | } | |
70a217f1 | 4288 | len = tcp_saved_syn_len(tp->saved_syn); |
34704ef0 | 4289 | if (copy_to_sockptr(optlen, &len, sizeof(int))) { |
d51bbff2 | 4290 | sockopt_release_sock(sk); |
cd8ae852 ED |
4291 | return -EFAULT; |
4292 | } | |
34704ef0 | 4293 | if (copy_to_sockptr(optval, tp->saved_syn->data, len)) { |
d51bbff2 | 4294 | sockopt_release_sock(sk); |
cd8ae852 ED |
4295 | return -EFAULT; |
4296 | } | |
4297 | tcp_saved_syn_free(tp); | |
d51bbff2 | 4298 | sockopt_release_sock(sk); |
cd8ae852 | 4299 | } else { |
d51bbff2 | 4300 | sockopt_release_sock(sk); |
cd8ae852 | 4301 | len = 0; |
34704ef0 | 4302 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
cd8ae852 ED |
4303 | return -EFAULT; |
4304 | } | |
4305 | return 0; | |
4306 | } | |
05255b82 ED |
4307 | #ifdef CONFIG_MMU |
4308 | case TCP_ZEROCOPY_RECEIVE: { | |
7eeba170 | 4309 | struct scm_timestamping_internal tss; |
e0fecb28 | 4310 | struct tcp_zerocopy_receive zc = {}; |
05255b82 ED |
4311 | int err; |
4312 | ||
34704ef0 | 4313 | if (copy_from_sockptr(&len, optlen, sizeof(int))) |
05255b82 | 4314 | return -EFAULT; |
2107d45f AR |
4315 | if (len < 0 || |
4316 | len < offsetofend(struct tcp_zerocopy_receive, length)) | |
05255b82 | 4317 | return -EINVAL; |
3c5a2fd0 | 4318 | if (unlikely(len > sizeof(zc))) { |
34704ef0 MKL |
4319 | err = check_zeroed_sockptr(optval, sizeof(zc), |
4320 | len - sizeof(zc)); | |
3c5a2fd0 AR |
4321 | if (err < 1) |
4322 | return err == 0 ? -EINVAL : err; | |
c8856c05 | 4323 | len = sizeof(zc); |
34704ef0 | 4324 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
0b7f41f6 AR |
4325 | return -EFAULT; |
4326 | } | |
34704ef0 | 4327 | if (copy_from_sockptr(&zc, optval, len)) |
05255b82 | 4328 | return -EFAULT; |
3c5a2fd0 AR |
4329 | if (zc.reserved) |
4330 | return -EINVAL; | |
4331 | if (zc.msg_flags & ~(TCP_VALID_ZC_MSG_FLAGS)) | |
4332 | return -EINVAL; | |
d51bbff2 | 4333 | sockopt_lock_sock(sk); |
7eeba170 | 4334 | err = tcp_zerocopy_receive(sk, &zc, &tss); |
9cacf81f SF |
4335 | err = BPF_CGROUP_RUN_PROG_GETSOCKOPT_KERN(sk, level, optname, |
4336 | &zc, &len, err); | |
d51bbff2 | 4337 | sockopt_release_sock(sk); |
7eeba170 AR |
4338 | if (len >= offsetofend(struct tcp_zerocopy_receive, msg_flags)) |
4339 | goto zerocopy_rcv_cmsg; | |
c8856c05 | 4340 | switch (len) { |
7eeba170 AR |
4341 | case offsetofend(struct tcp_zerocopy_receive, msg_flags): |
4342 | goto zerocopy_rcv_cmsg; | |
4343 | case offsetofend(struct tcp_zerocopy_receive, msg_controllen): | |
4344 | case offsetofend(struct tcp_zerocopy_receive, msg_control): | |
4345 | case offsetofend(struct tcp_zerocopy_receive, flags): | |
4346 | case offsetofend(struct tcp_zerocopy_receive, copybuf_len): | |
4347 | case offsetofend(struct tcp_zerocopy_receive, copybuf_address): | |
33946518 AR |
4348 | case offsetofend(struct tcp_zerocopy_receive, err): |
4349 | goto zerocopy_rcv_sk_err; | |
c8856c05 AR |
4350 | case offsetofend(struct tcp_zerocopy_receive, inq): |
4351 | goto zerocopy_rcv_inq; | |
4352 | case offsetofend(struct tcp_zerocopy_receive, length): | |
4353 | default: | |
4354 | goto zerocopy_rcv_out; | |
4355 | } | |
7eeba170 AR |
4356 | zerocopy_rcv_cmsg: |
4357 | if (zc.msg_flags & TCP_CMSG_TS) | |
4358 | tcp_zc_finalize_rx_tstamp(sk, &zc, &tss); | |
4359 | else | |
4360 | zc.msg_flags = 0; | |
33946518 AR |
4361 | zerocopy_rcv_sk_err: |
4362 | if (!err) | |
4363 | zc.err = sock_error(sk); | |
c8856c05 AR |
4364 | zerocopy_rcv_inq: |
4365 | zc.inq = tcp_inq_hint(sk); | |
4366 | zerocopy_rcv_out: | |
34704ef0 | 4367 | if (!err && copy_to_sockptr(optval, &zc, len)) |
05255b82 ED |
4368 | err = -EFAULT; |
4369 | return err; | |
4370 | } | |
4371 | #endif | |
1da177e4 LT |
4372 | default: |
4373 | return -ENOPROTOOPT; | |
3ff50b79 | 4374 | } |
1da177e4 | 4375 | |
34704ef0 | 4376 | if (copy_to_sockptr(optlen, &len, sizeof(int))) |
1da177e4 | 4377 | return -EFAULT; |
34704ef0 | 4378 | if (copy_to_sockptr(optval, &val, len)) |
1da177e4 LT |
4379 | return -EFAULT; |
4380 | return 0; | |
4381 | } | |
4382 | ||
9cacf81f SF |
4383 | bool tcp_bpf_bypass_getsockopt(int level, int optname) |
4384 | { | |
4385 | /* TCP do_tcp_getsockopt has optimized getsockopt implementation | |
4386 | * to avoid extra socket lock for TCP_ZEROCOPY_RECEIVE. | |
4387 | */ | |
4388 | if (level == SOL_TCP && optname == TCP_ZEROCOPY_RECEIVE) | |
4389 | return true; | |
4390 | ||
4391 | return false; | |
4392 | } | |
4393 | EXPORT_SYMBOL(tcp_bpf_bypass_getsockopt); | |
4394 | ||
3fdadf7d DM |
4395 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
4396 | int __user *optlen) | |
4397 | { | |
4398 | struct inet_connection_sock *icsk = inet_csk(sk); | |
4399 | ||
4400 | if (level != SOL_TCP) | |
f49cd2f4 KI |
4401 | /* Paired with WRITE_ONCE() in do_ipv6_setsockopt() and tcp_v6_connect() */ |
4402 | return READ_ONCE(icsk->icsk_af_ops)->getsockopt(sk, level, optname, | |
4403 | optval, optlen); | |
34704ef0 MKL |
4404 | return do_tcp_getsockopt(sk, level, optname, USER_SOCKPTR(optval), |
4405 | USER_SOCKPTR(optlen)); | |
3fdadf7d | 4406 | } |
4bc2f18b | 4407 | EXPORT_SYMBOL(tcp_getsockopt); |
3fdadf7d | 4408 | |
cfb6eeb4 | 4409 | #ifdef CONFIG_TCP_MD5SIG |
349ce993 | 4410 | static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool); |
71cea17e | 4411 | static DEFINE_MUTEX(tcp_md5sig_mutex); |
349ce993 | 4412 | static bool tcp_md5sig_pool_populated = false; |
cfb6eeb4 | 4413 | |
71cea17e | 4414 | static void __tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 4415 | { |
cf80e0e4 | 4416 | struct crypto_ahash *hash; |
cfb6eeb4 | 4417 | int cpu; |
cfb6eeb4 | 4418 | |
cf80e0e4 | 4419 | hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC); |
70477371 | 4420 | if (IS_ERR(hash)) |
cf80e0e4 HX |
4421 | return; |
4422 | ||
cfb6eeb4 | 4423 | for_each_possible_cpu(cpu) { |
19689e38 | 4424 | void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch; |
cf80e0e4 | 4425 | struct ahash_request *req; |
cfb6eeb4 | 4426 | |
19689e38 ED |
4427 | if (!scratch) { |
4428 | scratch = kmalloc_node(sizeof(union tcp_md5sum_block) + | |
4429 | sizeof(struct tcphdr), | |
4430 | GFP_KERNEL, | |
4431 | cpu_to_node(cpu)); | |
4432 | if (!scratch) | |
4433 | return; | |
4434 | per_cpu(tcp_md5sig_pool, cpu).scratch = scratch; | |
4435 | } | |
cf80e0e4 HX |
4436 | if (per_cpu(tcp_md5sig_pool, cpu).md5_req) |
4437 | continue; | |
4438 | ||
4439 | req = ahash_request_alloc(hash, GFP_KERNEL); | |
4440 | if (!req) | |
4441 | return; | |
4442 | ||
4443 | ahash_request_set_callback(req, 0, NULL, NULL); | |
4444 | ||
4445 | per_cpu(tcp_md5sig_pool, cpu).md5_req = req; | |
cfb6eeb4 | 4446 | } |
349ce993 ED |
4447 | /* before setting tcp_md5sig_pool_populated, we must commit all writes |
4448 | * to memory. See smp_rmb() in tcp_get_md5sig_pool() | |
71cea17e ED |
4449 | */ |
4450 | smp_wmb(); | |
aacd467c ED |
4451 | /* Paired with READ_ONCE() from tcp_alloc_md5sig_pool() |
4452 | * and tcp_get_md5sig_pool(). | |
4453 | */ | |
4454 | WRITE_ONCE(tcp_md5sig_pool_populated, true); | |
cfb6eeb4 YH |
4455 | } |
4456 | ||
71cea17e | 4457 | bool tcp_alloc_md5sig_pool(void) |
cfb6eeb4 | 4458 | { |
aacd467c ED |
4459 | /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ |
4460 | if (unlikely(!READ_ONCE(tcp_md5sig_pool_populated))) { | |
71cea17e ED |
4461 | mutex_lock(&tcp_md5sig_mutex); |
4462 | ||
6015c71e | 4463 | if (!tcp_md5sig_pool_populated) { |
71cea17e | 4464 | __tcp_alloc_md5sig_pool(); |
6015c71e | 4465 | if (tcp_md5sig_pool_populated) |
921f9a0f | 4466 | static_branch_inc(&tcp_md5_needed); |
6015c71e | 4467 | } |
71cea17e ED |
4468 | |
4469 | mutex_unlock(&tcp_md5sig_mutex); | |
cfb6eeb4 | 4470 | } |
aacd467c ED |
4471 | /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ |
4472 | return READ_ONCE(tcp_md5sig_pool_populated); | |
cfb6eeb4 | 4473 | } |
cfb6eeb4 YH |
4474 | EXPORT_SYMBOL(tcp_alloc_md5sig_pool); |
4475 | ||
35790c04 ED |
4476 | |
4477 | /** | |
4478 | * tcp_get_md5sig_pool - get md5sig_pool for this user | |
4479 | * | |
4480 | * We use percpu structure, so if we succeed, we exit with preemption | |
4481 | * and BH disabled, to make sure another thread or softirq handling | |
4482 | * wont try to get same context. | |
4483 | */ | |
4484 | struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) | |
cfb6eeb4 | 4485 | { |
35790c04 | 4486 | local_bh_disable(); |
cfb6eeb4 | 4487 | |
aacd467c ED |
4488 | /* Paired with WRITE_ONCE() from __tcp_alloc_md5sig_pool() */ |
4489 | if (READ_ONCE(tcp_md5sig_pool_populated)) { | |
349ce993 ED |
4490 | /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */ |
4491 | smp_rmb(); | |
4492 | return this_cpu_ptr(&tcp_md5sig_pool); | |
4493 | } | |
35790c04 ED |
4494 | local_bh_enable(); |
4495 | return NULL; | |
4496 | } | |
4497 | EXPORT_SYMBOL(tcp_get_md5sig_pool); | |
cfb6eeb4 | 4498 | |
49a72dfb | 4499 | int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, |
cf533ea5 | 4500 | const struct sk_buff *skb, unsigned int header_len) |
49a72dfb AL |
4501 | { |
4502 | struct scatterlist sg; | |
4503 | const struct tcphdr *tp = tcp_hdr(skb); | |
cf80e0e4 | 4504 | struct ahash_request *req = hp->md5_req; |
95c96174 ED |
4505 | unsigned int i; |
4506 | const unsigned int head_data_len = skb_headlen(skb) > header_len ? | |
4507 | skb_headlen(skb) - header_len : 0; | |
49a72dfb | 4508 | const struct skb_shared_info *shi = skb_shinfo(skb); |
d7fd1b57 | 4509 | struct sk_buff *frag_iter; |
49a72dfb AL |
4510 | |
4511 | sg_init_table(&sg, 1); | |
4512 | ||
4513 | sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); | |
cf80e0e4 HX |
4514 | ahash_request_set_crypt(req, &sg, NULL, head_data_len); |
4515 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
4516 | return 1; |
4517 | ||
4518 | for (i = 0; i < shi->nr_frags; ++i) { | |
d8e18a51 | 4519 | const skb_frag_t *f = &shi->frags[i]; |
b54c9d5b | 4520 | unsigned int offset = skb_frag_off(f); |
54d27fcb ED |
4521 | struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); |
4522 | ||
4523 | sg_set_page(&sg, page, skb_frag_size(f), | |
4524 | offset_in_page(offset)); | |
cf80e0e4 HX |
4525 | ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f)); |
4526 | if (crypto_ahash_update(req)) | |
49a72dfb AL |
4527 | return 1; |
4528 | } | |
4529 | ||
d7fd1b57 ED |
4530 | skb_walk_frags(skb, frag_iter) |
4531 | if (tcp_md5_hash_skb_data(hp, frag_iter, 0)) | |
4532 | return 1; | |
4533 | ||
49a72dfb AL |
4534 | return 0; |
4535 | } | |
49a72dfb AL |
4536 | EXPORT_SYMBOL(tcp_md5_hash_skb_data); |
4537 | ||
cf533ea5 | 4538 | int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key) |
49a72dfb | 4539 | { |
e6ced831 | 4540 | u8 keylen = READ_ONCE(key->keylen); /* paired with WRITE_ONCE() in tcp_md5_do_add */ |
49a72dfb AL |
4541 | struct scatterlist sg; |
4542 | ||
6a2febec ED |
4543 | sg_init_one(&sg, key->key, keylen); |
4544 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, keylen); | |
e6ced831 ED |
4545 | |
4546 | /* We use data_race() because tcp_md5_do_add() might change key->key under us */ | |
4547 | return data_race(crypto_ahash_update(hp->md5_req)); | |
49a72dfb | 4548 | } |
49a72dfb AL |
4549 | EXPORT_SYMBOL(tcp_md5_hash_key); |
4550 | ||
7bbb765b | 4551 | /* Called with rcu_read_lock() */ |
1330b6ef JK |
4552 | enum skb_drop_reason |
4553 | tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb, | |
4554 | const void *saddr, const void *daddr, | |
4555 | int family, int dif, int sdif) | |
7bbb765b DS |
4556 | { |
4557 | /* | |
4558 | * This gets called for each TCP segment that arrives | |
4559 | * so we want to be efficient. | |
4560 | * We have 3 drop cases: | |
4561 | * o No MD5 hash and one expected. | |
4562 | * o MD5 hash and we're not expecting one. | |
4563 | * o MD5 hash and its wrong. | |
4564 | */ | |
4565 | const __u8 *hash_location = NULL; | |
4566 | struct tcp_md5sig_key *hash_expected; | |
4567 | const struct tcphdr *th = tcp_hdr(skb); | |
4568 | struct tcp_sock *tp = tcp_sk(sk); | |
4569 | int genhash, l3index; | |
4570 | u8 newhash[16]; | |
4571 | ||
4572 | /* sdif set, means packet ingressed via a device | |
4573 | * in an L3 domain and dif is set to the l3mdev | |
4574 | */ | |
4575 | l3index = sdif ? dif : 0; | |
4576 | ||
4577 | hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family); | |
4578 | hash_location = tcp_parse_md5sig_option(th); | |
4579 | ||
4580 | /* We've parsed the options - do we have a hash? */ | |
4581 | if (!hash_expected && !hash_location) | |
1330b6ef | 4582 | return SKB_NOT_DROPPED_YET; |
7bbb765b DS |
4583 | |
4584 | if (hash_expected && !hash_location) { | |
7bbb765b | 4585 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
1330b6ef | 4586 | return SKB_DROP_REASON_TCP_MD5NOTFOUND; |
7bbb765b DS |
4587 | } |
4588 | ||
4589 | if (!hash_expected && hash_location) { | |
7bbb765b | 4590 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
1330b6ef | 4591 | return SKB_DROP_REASON_TCP_MD5UNEXPECTED; |
7bbb765b DS |
4592 | } |
4593 | ||
e62d2e11 ED |
4594 | /* Check the signature. |
4595 | * To support dual stack listeners, we need to handle | |
4596 | * IPv4-mapped case. | |
4597 | */ | |
4598 | if (family == AF_INET) | |
4599 | genhash = tcp_v4_md5_hash_skb(newhash, | |
4600 | hash_expected, | |
4601 | NULL, skb); | |
4602 | else | |
4603 | genhash = tp->af_specific->calc_md5_hash(newhash, | |
4604 | hash_expected, | |
4605 | NULL, skb); | |
7bbb765b DS |
4606 | |
4607 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
7bbb765b DS |
4608 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
4609 | if (family == AF_INET) { | |
4610 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n", | |
4611 | saddr, ntohs(th->source), | |
4612 | daddr, ntohs(th->dest), | |
4613 | genhash ? " tcp_v4_calc_md5_hash failed" | |
4614 | : "", l3index); | |
4615 | } else { | |
4616 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n", | |
4617 | genhash ? "failed" : "mismatch", | |
4618 | saddr, ntohs(th->source), | |
4619 | daddr, ntohs(th->dest), l3index); | |
4620 | } | |
1330b6ef | 4621 | return SKB_DROP_REASON_TCP_MD5FAILURE; |
7bbb765b | 4622 | } |
1330b6ef | 4623 | return SKB_NOT_DROPPED_YET; |
7bbb765b DS |
4624 | } |
4625 | EXPORT_SYMBOL(tcp_inbound_md5_hash); | |
4626 | ||
cfb6eeb4 YH |
4627 | #endif |
4628 | ||
4ac02bab AK |
4629 | void tcp_done(struct sock *sk) |
4630 | { | |
d983ea6f | 4631 | struct request_sock *req; |
8336886f | 4632 | |
cab209e5 ED |
4633 | /* We might be called with a new socket, after |
4634 | * inet_csk_prepare_forced_close() has been called | |
4635 | * so we can not use lockdep_sock_is_held(sk) | |
4636 | */ | |
4637 | req = rcu_dereference_protected(tcp_sk(sk)->fastopen_rsk, 1); | |
8336886f | 4638 | |
5a5f3a8d | 4639 | if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV) |
c10d9310 | 4640 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ATTEMPTFAILS); |
4ac02bab AK |
4641 | |
4642 | tcp_set_state(sk, TCP_CLOSE); | |
4643 | tcp_clear_xmit_timers(sk); | |
00db4124 | 4644 | if (req) |
8336886f | 4645 | reqsk_fastopen_remove(sk, req, false); |
4ac02bab AK |
4646 | |
4647 | sk->sk_shutdown = SHUTDOWN_MASK; | |
4648 | ||
4649 | if (!sock_flag(sk, SOCK_DEAD)) | |
4650 | sk->sk_state_change(sk); | |
4651 | else | |
4652 | inet_csk_destroy_sock(sk); | |
4653 | } | |
4654 | EXPORT_SYMBOL_GPL(tcp_done); | |
4655 | ||
c1e64e29 LC |
4656 | int tcp_abort(struct sock *sk, int err) |
4657 | { | |
af9784d0 | 4658 | int state = inet_sk_state_load(sk); |
07f6f4a3 | 4659 | |
af9784d0 ED |
4660 | if (state == TCP_NEW_SYN_RECV) { |
4661 | struct request_sock *req = inet_reqsk(sk); | |
4662 | ||
4663 | local_bh_disable(); | |
4664 | inet_csk_reqsk_queue_drop(req->rsk_listener, req); | |
4665 | local_bh_enable(); | |
4666 | return 0; | |
4667 | } | |
4668 | if (state == TCP_TIME_WAIT) { | |
4669 | struct inet_timewait_sock *tw = inet_twsk(sk); | |
4670 | ||
4671 | refcount_inc(&tw->tw_refcnt); | |
4672 | local_bh_disable(); | |
4673 | inet_twsk_deschedule_put(tw); | |
4674 | local_bh_enable(); | |
4675 | return 0; | |
c1e64e29 LC |
4676 | } |
4677 | ||
4678 | /* Don't race with userspace socket closes such as tcp_close. */ | |
4679 | lock_sock(sk); | |
4680 | ||
2010b93e LC |
4681 | if (sk->sk_state == TCP_LISTEN) { |
4682 | tcp_set_state(sk, TCP_CLOSE); | |
4683 | inet_csk_listen_stop(sk); | |
4684 | } | |
4685 | ||
c1e64e29 LC |
4686 | /* Don't race with BH socket closes such as inet_csk_listen_stop. */ |
4687 | local_bh_disable(); | |
4688 | bh_lock_sock(sk); | |
4689 | ||
4690 | if (!sock_flag(sk, SOCK_DEAD)) { | |
4691 | sk->sk_err = err; | |
4692 | /* This barrier is coupled with smp_rmb() in tcp_poll() */ | |
4693 | smp_wmb(); | |
e3ae2365 | 4694 | sk_error_report(sk); |
c1e64e29 LC |
4695 | if (tcp_need_reset(sk->sk_state)) |
4696 | tcp_send_active_reset(sk, GFP_ATOMIC); | |
4697 | tcp_done(sk); | |
4698 | } | |
4699 | ||
4700 | bh_unlock_sock(sk); | |
4701 | local_bh_enable(); | |
e05836ac | 4702 | tcp_write_queue_purge(sk); |
c1e64e29 | 4703 | release_sock(sk); |
c1e64e29 LC |
4704 | return 0; |
4705 | } | |
4706 | EXPORT_SYMBOL_GPL(tcp_abort); | |
4707 | ||
5f8ef48d | 4708 | extern struct tcp_congestion_ops tcp_reno; |
1da177e4 LT |
4709 | |
4710 | static __initdata unsigned long thash_entries; | |
4711 | static int __init set_thash_entries(char *str) | |
4712 | { | |
413c27d8 EZ |
4713 | ssize_t ret; |
4714 | ||
1da177e4 LT |
4715 | if (!str) |
4716 | return 0; | |
413c27d8 EZ |
4717 | |
4718 | ret = kstrtoul(str, 0, &thash_entries); | |
4719 | if (ret) | |
4720 | return 0; | |
4721 | ||
1da177e4 LT |
4722 | return 1; |
4723 | } | |
4724 | __setup("thash_entries=", set_thash_entries); | |
4725 | ||
47d7a88c | 4726 | static void __init tcp_init_mem(void) |
4acb4190 | 4727 | { |
b66e91cc ED |
4728 | unsigned long limit = nr_free_buffer_pages() / 16; |
4729 | ||
4acb4190 | 4730 | limit = max(limit, 128UL); |
b66e91cc ED |
4731 | sysctl_tcp_mem[0] = limit / 4 * 3; /* 4.68 % */ |
4732 | sysctl_tcp_mem[1] = limit; /* 6.25 % */ | |
4733 | sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; /* 9.37 % */ | |
4acb4190 GC |
4734 | } |
4735 | ||
1da177e4 LT |
4736 | void __init tcp_init(void) |
4737 | { | |
b49960a0 | 4738 | int max_rshare, max_wshare, cnt; |
b2d3ea4a | 4739 | unsigned long limit; |
074b8517 | 4740 | unsigned int i; |
1da177e4 | 4741 | |
3b4929f6 | 4742 | BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE); |
b2d3ea4a | 4743 | BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > |
c593642c | 4744 | sizeof_field(struct sk_buff, cb)); |
1da177e4 | 4745 | |
908c7f19 | 4746 | percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL); |
19757ceb ED |
4747 | |
4748 | timer_setup(&tcp_orphan_timer, tcp_orphan_update, TIMER_DEFERRABLE); | |
4749 | mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD); | |
4750 | ||
27da6d37 MKL |
4751 | inet_hashinfo2_init(&tcp_hashinfo, "tcp_listen_portaddr_hash", |
4752 | thash_entries, 21, /* one slot per 2 MB*/ | |
4753 | 0, 64 * 1024); | |
6e04e021 ACM |
4754 | tcp_hashinfo.bind_bucket_cachep = |
4755 | kmem_cache_create("tcp_bind_bucket", | |
4756 | sizeof(struct inet_bind_bucket), 0, | |
990c74e3 VA |
4757 | SLAB_HWCACHE_ALIGN | SLAB_PANIC | |
4758 | SLAB_ACCOUNT, | |
4759 | NULL); | |
28044fc1 JK |
4760 | tcp_hashinfo.bind2_bucket_cachep = |
4761 | kmem_cache_create("tcp_bind2_bucket", | |
4762 | sizeof(struct inet_bind2_bucket), 0, | |
4763 | SLAB_HWCACHE_ALIGN | SLAB_PANIC | | |
4764 | SLAB_ACCOUNT, | |
4765 | NULL); | |
1da177e4 | 4766 | |
1da177e4 LT |
4767 | /* Size and allocate the main established and bind bucket |
4768 | * hash tables. | |
4769 | * | |
4770 | * The methodology is similar to that of the buffer cache. | |
4771 | */ | |
6e04e021 | 4772 | tcp_hashinfo.ehash = |
1da177e4 | 4773 | alloc_large_system_hash("TCP established", |
0f7ff927 | 4774 | sizeof(struct inet_ehash_bucket), |
1da177e4 | 4775 | thash_entries, |
fd90b29d | 4776 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 4777 | 0, |
1da177e4 | 4778 | NULL, |
f373b53b | 4779 | &tcp_hashinfo.ehash_mask, |
31fe62b9 | 4780 | 0, |
0ccfe618 | 4781 | thash_entries ? 0 : 512 * 1024); |
05dbc7b5 | 4782 | for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) |
3ab5aee7 | 4783 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i); |
05dbc7b5 | 4784 | |
230140cf ED |
4785 | if (inet_ehash_locks_alloc(&tcp_hashinfo)) |
4786 | panic("TCP: failed to alloc ehash_locks"); | |
6e04e021 | 4787 | tcp_hashinfo.bhash = |
593d1ebe | 4788 | alloc_large_system_hash("TCP bind", |
28044fc1 | 4789 | 2 * sizeof(struct inet_bind_hashbucket), |
f373b53b | 4790 | tcp_hashinfo.ehash_mask + 1, |
fd90b29d | 4791 | 17, /* one slot per 128 KB of memory */ |
9e950efa | 4792 | 0, |
6e04e021 | 4793 | &tcp_hashinfo.bhash_size, |
1da177e4 | 4794 | NULL, |
31fe62b9 | 4795 | 0, |
1da177e4 | 4796 | 64 * 1024); |
074b8517 | 4797 | tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size; |
28044fc1 | 4798 | tcp_hashinfo.bhash2 = tcp_hashinfo.bhash + tcp_hashinfo.bhash_size; |
6e04e021 ACM |
4799 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
4800 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); | |
4801 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); | |
28044fc1 JK |
4802 | spin_lock_init(&tcp_hashinfo.bhash2[i].lock); |
4803 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash2[i].chain); | |
1da177e4 LT |
4804 | } |
4805 | ||
d1e5e640 | 4806 | tcp_hashinfo.pernet = false; |
c5ed63d6 ED |
4807 | |
4808 | cnt = tcp_hashinfo.ehash_mask + 1; | |
c5ed63d6 | 4809 | sysctl_tcp_max_orphans = cnt / 2; |
1da177e4 | 4810 | |
a4fe34bf | 4811 | tcp_init_mem(); |
c43b874d | 4812 | /* Set per-socket limits to no more than 1/128 the pressure threshold */ |
5fb84b14 | 4813 | limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); |
b49960a0 ED |
4814 | max_wshare = min(4UL*1024*1024, limit); |
4815 | max_rshare = min(6UL*1024*1024, limit); | |
7b4f4b5e | 4816 | |
100fdd1f | 4817 | init_net.ipv4.sysctl_tcp_wmem[0] = PAGE_SIZE; |
356d1833 ED |
4818 | init_net.ipv4.sysctl_tcp_wmem[1] = 16*1024; |
4819 | init_net.ipv4.sysctl_tcp_wmem[2] = max(64*1024, max_wshare); | |
7b4f4b5e | 4820 | |
100fdd1f | 4821 | init_net.ipv4.sysctl_tcp_rmem[0] = PAGE_SIZE; |
a337531b YC |
4822 | init_net.ipv4.sysctl_tcp_rmem[1] = 131072; |
4823 | init_net.ipv4.sysctl_tcp_rmem[2] = max(131072, max_rshare); | |
1da177e4 | 4824 | |
afd46503 | 4825 | pr_info("Hash tables configured (established %u bind %u)\n", |
058bd4d2 | 4826 | tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size); |
317a76f9 | 4827 | |
1946e672 | 4828 | tcp_v4_init(); |
51c5d0c4 | 4829 | tcp_metrics_init(); |
55d8694f | 4830 | BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0); |
46d3ceab | 4831 | tcp_tasklet_init(); |
f870fa0b | 4832 | mptcp_init(); |
1da177e4 | 4833 | } |