Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Implementation of the Transmission Control Protocol(TCP). |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| 11 | * Corey Minyard <wf-rch!minyard@relay.EU.net> |
| 12 | * Florian La Roche, <flla@stud.uni-sb.de> |
| 13 | * Charles Hedrick, <hedrick@klinzhai.rutgers.edu> |
| 14 | * Linus Torvalds, <torvalds@cs.helsinki.fi> |
| 15 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 16 | * Matthew Dillon, <dillon@apollo.west.oic.com> |
| 17 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> |
| 18 | * Jorge Cwik, <jorge@laser.satlink.net> |
| 19 | * |
| 20 | * Fixes: |
| 21 | * Alan Cox : Numerous verify_area() calls |
| 22 | * Alan Cox : Set the ACK bit on a reset |
| 23 | * Alan Cox : Stopped it crashing if it closed while |
| 24 | * sk->inuse=1 and was trying to connect |
| 25 | * (tcp_err()). |
| 26 | * Alan Cox : All icmp error handling was broken |
| 27 | * pointers passed where wrong and the |
| 28 | * socket was looked up backwards. Nobody |
| 29 | * tested any icmp error code obviously. |
| 30 | * Alan Cox : tcp_err() now handled properly. It |
| 31 | * wakes people on errors. poll |
| 32 | * behaves and the icmp error race |
| 33 | * has gone by moving it into sock.c |
| 34 | * Alan Cox : tcp_send_reset() fixed to work for |
| 35 | * everything not just packets for |
| 36 | * unknown sockets. |
| 37 | * Alan Cox : tcp option processing. |
| 38 | * Alan Cox : Reset tweaked (still not 100%) [Had |
| 39 | * syn rule wrong] |
| 40 | * Herp Rosmanith : More reset fixes |
| 41 | * Alan Cox : No longer acks invalid rst frames. |
| 42 | * Acking any kind of RST is right out. |
| 43 | * Alan Cox : Sets an ignore me flag on an rst |
| 44 | * receive otherwise odd bits of prattle |
| 45 | * escape still |
| 46 | * Alan Cox : Fixed another acking RST frame bug. |
| 47 | * Should stop LAN workplace lockups. |
| 48 | * Alan Cox : Some tidyups using the new skb list |
| 49 | * facilities |
| 50 | * Alan Cox : sk->keepopen now seems to work |
| 51 | * Alan Cox : Pulls options out correctly on accepts |
| 52 | * Alan Cox : Fixed assorted sk->rqueue->next errors |
| 53 | * Alan Cox : PSH doesn't end a TCP read. Switched a |
| 54 | * bit to skb ops. |
| 55 | * Alan Cox : Tidied tcp_data to avoid a potential |
| 56 | * nasty. |
| 57 | * Alan Cox : Added some better commenting, as the |
| 58 | * tcp is hard to follow |
| 59 | * Alan Cox : Removed incorrect check for 20 * psh |
| 60 | * Michael O'Reilly : ack < copied bug fix. |
| 61 | * Johannes Stille : Misc tcp fixes (not all in yet). |
| 62 | * Alan Cox : FIN with no memory -> CRASH |
| 63 | * Alan Cox : Added socket option proto entries. |
| 64 | * Also added awareness of them to accept. |
| 65 | * Alan Cox : Added TCP options (SOL_TCP) |
| 66 | * Alan Cox : Switched wakeup calls to callbacks, |
| 67 | * so the kernel can layer network |
| 68 | * sockets. |
| 69 | * Alan Cox : Use ip_tos/ip_ttl settings. |
| 70 | * Alan Cox : Handle FIN (more) properly (we hope). |
| 71 | * Alan Cox : RST frames sent on unsynchronised |
| 72 | * state ack error. |
| 73 | * Alan Cox : Put in missing check for SYN bit. |
| 74 | * Alan Cox : Added tcp_select_window() aka NET2E |
| 75 | * window non shrink trick. |
| 76 | * Alan Cox : Added a couple of small NET2E timer |
| 77 | * fixes |
| 78 | * Charles Hedrick : TCP fixes |
| 79 | * Toomas Tamm : TCP window fixes |
| 80 | * Alan Cox : Small URG fix to rlogin ^C ack fight |
| 81 | * Charles Hedrick : Rewrote most of it to actually work |
| 82 | * Linus : Rewrote tcp_read() and URG handling |
| 83 | * completely |
| 84 | * Gerhard Koerting: Fixed some missing timer handling |
| 85 | * Matthew Dillon : Reworked TCP machine states as per RFC |
| 86 | * Gerhard Koerting: PC/TCP workarounds |
| 87 | * Adam Caldwell : Assorted timer/timing errors |
| 88 | * Matthew Dillon : Fixed another RST bug |
| 89 | * Alan Cox : Move to kernel side addressing changes. |
| 90 | * Alan Cox : Beginning work on TCP fastpathing |
| 91 | * (not yet usable) |
| 92 | * Arnt Gulbrandsen: Turbocharged tcp_check() routine. |
| 93 | * Alan Cox : TCP fast path debugging |
| 94 | * Alan Cox : Window clamping |
| 95 | * Michael Riepe : Bug in tcp_check() |
| 96 | * Matt Dillon : More TCP improvements and RST bug fixes |
| 97 | * Matt Dillon : Yet more small nasties remove from the |
| 98 | * TCP code (Be very nice to this man if |
| 99 | * tcp finally works 100%) 8) |
| 100 | * Alan Cox : BSD accept semantics. |
| 101 | * Alan Cox : Reset on closedown bug. |
| 102 | * Peter De Schrijver : ENOTCONN check missing in tcp_sendto(). |
| 103 | * Michael Pall : Handle poll() after URG properly in |
| 104 | * all cases. |
| 105 | * Michael Pall : Undo the last fix in tcp_read_urg() |
| 106 | * (multi URG PUSH broke rlogin). |
| 107 | * Michael Pall : Fix the multi URG PUSH problem in |
| 108 | * tcp_readable(), poll() after URG |
| 109 | * works now. |
| 110 | * Michael Pall : recv(...,MSG_OOB) never blocks in the |
| 111 | * BSD api. |
| 112 | * Alan Cox : Changed the semantics of sk->socket to |
| 113 | * fix a race and a signal problem with |
| 114 | * accept() and async I/O. |
| 115 | * Alan Cox : Relaxed the rules on tcp_sendto(). |
| 116 | * Yury Shevchuk : Really fixed accept() blocking problem. |
| 117 | * Craig I. Hagan : Allow for BSD compatible TIME_WAIT for |
| 118 | * clients/servers which listen in on |
| 119 | * fixed ports. |
| 120 | * Alan Cox : Cleaned the above up and shrank it to |
| 121 | * a sensible code size. |
| 122 | * Alan Cox : Self connect lockup fix. |
| 123 | * Alan Cox : No connect to multicast. |
| 124 | * Ross Biro : Close unaccepted children on master |
| 125 | * socket close. |
| 126 | * Alan Cox : Reset tracing code. |
| 127 | * Alan Cox : Spurious resets on shutdown. |
| 128 | * Alan Cox : Giant 15 minute/60 second timer error |
| 129 | * Alan Cox : Small whoops in polling before an |
| 130 | * accept. |
| 131 | * Alan Cox : Kept the state trace facility since |
| 132 | * it's handy for debugging. |
| 133 | * Alan Cox : More reset handler fixes. |
| 134 | * Alan Cox : Started rewriting the code based on |
| 135 | * the RFC's for other useful protocol |
| 136 | * references see: Comer, KA9Q NOS, and |
| 137 | * for a reference on the difference |
| 138 | * between specifications and how BSD |
| 139 | * works see the 4.4lite source. |
| 140 | * A.N.Kuznetsov : Don't time wait on completion of tidy |
| 141 | * close. |
| 142 | * Linus Torvalds : Fin/Shutdown & copied_seq changes. |
| 143 | * Linus Torvalds : Fixed BSD port reuse to work first syn |
| 144 | * Alan Cox : Reimplemented timers as per the RFC |
| 145 | * and using multiple timers for sanity. |
| 146 | * Alan Cox : Small bug fixes, and a lot of new |
| 147 | * comments. |
| 148 | * Alan Cox : Fixed dual reader crash by locking |
| 149 | * the buffers (much like datagram.c) |
| 150 | * Alan Cox : Fixed stuck sockets in probe. A probe |
| 151 | * now gets fed up of retrying without |
| 152 | * (even a no space) answer. |
| 153 | * Alan Cox : Extracted closing code better |
| 154 | * Alan Cox : Fixed the closing state machine to |
| 155 | * resemble the RFC. |
| 156 | * Alan Cox : More 'per spec' fixes. |
| 157 | * Jorge Cwik : Even faster checksumming. |
| 158 | * Alan Cox : tcp_data() doesn't ack illegal PSH |
| 159 | * only frames. At least one pc tcp stack |
| 160 | * generates them. |
| 161 | * Alan Cox : Cache last socket. |
| 162 | * Alan Cox : Per route irtt. |
| 163 | * Matt Day : poll()->select() match BSD precisely on error |
| 164 | * Alan Cox : New buffers |
| 165 | * Marc Tamsky : Various sk->prot->retransmits and |
| 166 | * sk->retransmits misupdating fixed. |
| 167 | * Fixed tcp_write_timeout: stuck close, |
| 168 | * and TCP syn retries gets used now. |
| 169 | * Mark Yarvis : In tcp_read_wakeup(), don't send an |
| 170 | * ack if state is TCP_CLOSED. |
| 171 | * Alan Cox : Look up device on a retransmit - routes may |
| 172 | * change. Doesn't yet cope with MSS shrink right |
| 173 | * but it's a start! |
| 174 | * Marc Tamsky : Closing in closing fixes. |
| 175 | * Mike Shaver : RFC1122 verifications. |
| 176 | * Alan Cox : rcv_saddr errors. |
| 177 | * Alan Cox : Block double connect(). |
| 178 | * Alan Cox : Small hooks for enSKIP. |
| 179 | * Alexey Kuznetsov: Path MTU discovery. |
| 180 | * Alan Cox : Support soft errors. |
| 181 | * Alan Cox : Fix MTU discovery pathological case |
| 182 | * when the remote claims no mtu! |
| 183 | * Marc Tamsky : TCP_CLOSE fix. |
| 184 | * Colin (G3TNE) : Send a reset on syn ack replies in |
| 185 | * window but wrong (fixes NT lpd problems) |
| 186 | * Pedro Roque : Better TCP window handling, delayed ack. |
| 187 | * Joerg Reuter : No modification of locked buffers in |
| 188 | * tcp_do_retransmit() |
| 189 | * Eric Schenk : Changed receiver side silly window |
| 190 | * avoidance algorithm to BSD style |
| 191 | * algorithm. This doubles throughput |
| 192 | * against machines running Solaris, |
| 193 | * and seems to result in general |
| 194 | * improvement. |
| 195 | * Stefan Magdalinski : adjusted tcp_readable() to fix FIONREAD |
| 196 | * Willy Konynenberg : Transparent proxying support. |
| 197 | * Mike McLagan : Routing by source |
| 198 | * Keith Owens : Do proper merging with partial SKB's in |
| 199 | * tcp_do_sendmsg to avoid burstiness. |
| 200 | * Eric Schenk : Fix fast close down bug with |
| 201 | * shutdown() followed by close(). |
| 202 | * Andi Kleen : Make poll agree with SIGIO |
| 203 | * Salvatore Sanfilippo : Support SO_LINGER with linger == 1 and |
| 204 | * lingertime == 0 (RFC 793 ABORT Call) |
| 205 | * Hirokazu Takahashi : Use copy_from_user() instead of |
| 206 | * csum_and_copy_from_user() if possible. |
| 207 | * |
| 208 | * This program is free software; you can redistribute it and/or |
| 209 | * modify it under the terms of the GNU General Public License |
| 210 | * as published by the Free Software Foundation; either version |
| 211 | * 2 of the License, or(at your option) any later version. |
| 212 | * |
| 213 | * Description of States: |
| 214 | * |
| 215 | * TCP_SYN_SENT sent a connection request, waiting for ack |
| 216 | * |
| 217 | * TCP_SYN_RECV received a connection request, sent ack, |
| 218 | * waiting for final ack in three-way handshake. |
| 219 | * |
| 220 | * TCP_ESTABLISHED connection established |
| 221 | * |
| 222 | * TCP_FIN_WAIT1 our side has shutdown, waiting to complete |
| 223 | * transmission of remaining buffered data |
| 224 | * |
| 225 | * TCP_FIN_WAIT2 all buffered data sent, waiting for remote |
| 226 | * to shutdown |
| 227 | * |
| 228 | * TCP_CLOSING both sides have shutdown but we still have |
| 229 | * data we have to finish sending |
| 230 | * |
| 231 | * TCP_TIME_WAIT timeout to catch resent junk before entering |
| 232 | * closed, can only be entered from FIN_WAIT2 |
| 233 | * or CLOSING. Required because the other end |
| 234 | * may not have gotten our last ACK causing it |
| 235 | * to retransmit the data packet (which we ignore) |
| 236 | * |
| 237 | * TCP_CLOSE_WAIT remote side has shutdown and is waiting for |
| 238 | * us to finish writing our data and to shutdown |
| 239 | * (we have to close() to move on to LAST_ACK) |
| 240 | * |
| 241 | * TCP_LAST_ACK out side has shutdown after remote has |
| 242 | * shutdown. There may still be data in our |
| 243 | * buffer that we have to finish sending |
| 244 | * |
| 245 | * TCP_CLOSE socket is finished |
| 246 | */ |
| 247 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 248 | #define pr_fmt(fmt) "TCP: " fmt |
| 249 | |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 250 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | #include <linux/module.h> |
| 252 | #include <linux/types.h> |
| 253 | #include <linux/fcntl.h> |
| 254 | #include <linux/poll.h> |
Eric Dumazet | 6e9250f | 2015-04-28 16:23:49 -0700 | [diff] [blame] | 255 | #include <linux/inet_diag.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | #include <linux/fs.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 258 | #include <linux/skbuff.h> |
Andrew Morton | 81b23b4 | 2008-07-03 03:22:02 -0700 | [diff] [blame] | 259 | #include <linux/scatterlist.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 260 | #include <linux/splice.h> |
| 261 | #include <linux/net.h> |
| 262 | #include <linux/socket.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | #include <linux/random.h> |
| 264 | #include <linux/bootmem.h> |
Miquel van Smoorenburg | 57413eb | 2008-06-27 17:23:57 -0700 | [diff] [blame] | 265 | #include <linux/highmem.h> |
| 266 | #include <linux/swap.h> |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 267 | #include <linux/cache.h> |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 268 | #include <linux/err.h> |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 269 | #include <linux/crypto.h> |
William Allen Simpson | da5c78c | 2009-12-02 18:12:09 +0000 | [diff] [blame] | 270 | #include <linux/time.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 271 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
| 273 | #include <net/icmp.h> |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 274 | #include <net/inet_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | #include <net/tcp.h> |
| 276 | #include <net/xfrm.h> |
| 277 | #include <net/ip.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 278 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | #include <asm/uaccess.h> |
| 281 | #include <asm/ioctls.h> |
Eliezer Tamir | 076bb0c | 2013-07-10 17:13:17 +0300 | [diff] [blame] | 282 | #include <net/busy_poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 284 | int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
Eric Dumazet | 95bd09e | 2013-08-27 05:46:32 -0700 | [diff] [blame] | 286 | int sysctl_tcp_min_tso_segs __read_mostly = 2; |
| 287 | |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 288 | int sysctl_tcp_autocorking __read_mostly = 1; |
| 289 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 290 | struct percpu_counter tcp_orphan_count; |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 291 | EXPORT_SYMBOL_GPL(tcp_orphan_count); |
| 292 | |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 293 | long sysctl_tcp_mem[3] __read_mostly; |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 294 | int sysctl_tcp_wmem[3] __read_mostly; |
| 295 | int sysctl_tcp_rmem[3] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 297 | EXPORT_SYMBOL(sysctl_tcp_mem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | EXPORT_SYMBOL(sysctl_tcp_rmem); |
| 299 | EXPORT_SYMBOL(sysctl_tcp_wmem); |
| 300 | |
Eric Dumazet | 8d987e5 | 2010-11-09 23:24:26 +0000 | [diff] [blame] | 301 | atomic_long_t tcp_memory_allocated; /* Current allocated memory. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | EXPORT_SYMBOL(tcp_memory_allocated); |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 303 | |
| 304 | /* |
| 305 | * Current number of TCP sockets. |
| 306 | */ |
| 307 | struct percpu_counter tcp_sockets_allocated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | EXPORT_SYMBOL(tcp_sockets_allocated); |
| 309 | |
| 310 | /* |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 311 | * TCP splice context |
| 312 | */ |
| 313 | struct tcp_splice_state { |
| 314 | struct pipe_inode_info *pipe; |
| 315 | size_t len; |
| 316 | unsigned int flags; |
| 317 | }; |
| 318 | |
| 319 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | * Pressure flag: try to collapse. |
| 321 | * Technical note: it is used by multiple contexts non atomically. |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 322 | * All the __sk_mem_schedule() is of this nature: accounting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | * is strict, actions are advisory and have some latency. |
| 324 | */ |
Eric Dumazet | 4103f8c | 2007-03-27 13:58:31 -0700 | [diff] [blame] | 325 | int tcp_memory_pressure __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | EXPORT_SYMBOL(tcp_memory_pressure); |
| 327 | |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 328 | void tcp_enter_memory_pressure(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
| 330 | if (!tcp_memory_pressure) { |
Pavel Emelyanov | 4e67344 | 2008-07-16 20:30:14 -0700 | [diff] [blame] | 331 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | tcp_memory_pressure = 1; |
| 333 | } |
| 334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | EXPORT_SYMBOL(tcp_enter_memory_pressure); |
| 336 | |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 337 | /* Convert seconds to retransmits based on initial and max timeout */ |
| 338 | static u8 secs_to_retrans(int seconds, int timeout, int rto_max) |
| 339 | { |
| 340 | u8 res = 0; |
| 341 | |
| 342 | if (seconds > 0) { |
| 343 | int period = timeout; |
| 344 | |
| 345 | res = 1; |
| 346 | while (seconds > period && res < 255) { |
| 347 | res++; |
| 348 | timeout <<= 1; |
| 349 | if (timeout > rto_max) |
| 350 | timeout = rto_max; |
| 351 | period += timeout; |
| 352 | } |
| 353 | } |
| 354 | return res; |
| 355 | } |
| 356 | |
| 357 | /* Convert retransmits to seconds based on initial and max timeout */ |
| 358 | static int retrans_to_secs(u8 retrans, int timeout, int rto_max) |
| 359 | { |
| 360 | int period = 0; |
| 361 | |
| 362 | if (retrans > 0) { |
| 363 | period = timeout; |
| 364 | while (--retrans) { |
| 365 | timeout <<= 1; |
| 366 | if (timeout > rto_max) |
| 367 | timeout = rto_max; |
| 368 | period += timeout; |
| 369 | } |
| 370 | } |
| 371 | return period; |
| 372 | } |
| 373 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 374 | /* Address-family independent initialization for a tcp_sock. |
| 375 | * |
| 376 | * NOTE: A lot of things set to zero explicitly by call to |
| 377 | * sk_alloc() so need not be done here. |
| 378 | */ |
| 379 | void tcp_init_sock(struct sock *sk) |
| 380 | { |
| 381 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 382 | struct tcp_sock *tp = tcp_sk(sk); |
| 383 | |
Eric Dumazet | 996b175 | 2014-01-06 09:36:12 -0800 | [diff] [blame] | 384 | __skb_queue_head_init(&tp->out_of_order_queue); |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 385 | tcp_init_xmit_timers(sk); |
| 386 | tcp_prequeue_init(tp); |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 387 | INIT_LIST_HEAD(&tp->tsq_node); |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 388 | |
| 389 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 390 | tp->mdev_us = jiffies_to_usecs(TCP_TIMEOUT_INIT); |
Yuchung Cheng | f672258 | 2015-10-16 21:57:42 -0700 | [diff] [blame] | 391 | tp->rtt_min[0].rtt = ~0U; |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 392 | |
| 393 | /* So many TCP implementations out there (incorrectly) count the |
| 394 | * initial SYN frame in their delayed-ACK and congestion control |
| 395 | * algorithms that we must have the following bandaid to talk |
| 396 | * efficiently to them. -DaveM |
| 397 | */ |
| 398 | tp->snd_cwnd = TCP_INIT_CWND; |
| 399 | |
| 400 | /* See draft-stevens-tcpca-spec-01 for discussion of the |
| 401 | * initialization of these values. |
| 402 | */ |
| 403 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
| 404 | tp->snd_cwnd_clamp = ~0; |
| 405 | tp->mss_cache = TCP_MSS_DEFAULT; |
Eric Dumazet | d654976 | 2015-05-21 21:51:19 -0700 | [diff] [blame] | 406 | u64_stats_init(&tp->syncp); |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 407 | |
| 408 | tp->reordering = sysctl_tcp_reordering; |
Yuchung Cheng | eed530b | 2012-05-02 13:30:03 +0000 | [diff] [blame] | 409 | tcp_enable_early_retrans(tp); |
Florian Westphal | 55d8694 | 2014-09-26 22:37:32 +0200 | [diff] [blame] | 410 | tcp_assign_congestion_control(sk); |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 411 | |
Andrey Vagin | ceaa1fe | 2013-02-11 05:50:17 +0000 | [diff] [blame] | 412 | tp->tsoffset = 0; |
| 413 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 414 | sk->sk_state = TCP_CLOSE; |
| 415 | |
| 416 | sk->sk_write_space = sk_stream_write_space; |
| 417 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| 418 | |
| 419 | icsk->icsk_sync_mss = tcp_sync_mss; |
| 420 | |
Neal Cardwell | 900f65d | 2012-04-19 09:55:21 +0000 | [diff] [blame] | 421 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| 422 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| 423 | |
| 424 | local_bh_disable(); |
| 425 | sock_update_memcg(sk); |
| 426 | sk_sockets_allocated_inc(sk); |
| 427 | local_bh_enable(); |
| 428 | } |
| 429 | EXPORT_SYMBOL(tcp_init_sock); |
| 430 | |
Willem de Bruijn | f066e2b | 2014-08-06 15:09:44 -0400 | [diff] [blame] | 431 | static void tcp_tx_timestamp(struct sock *sk, struct sk_buff *skb) |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 432 | { |
Willem de Bruijn | f066e2b | 2014-08-06 15:09:44 -0400 | [diff] [blame] | 433 | if (sk->sk_tsflags) { |
| 434 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 435 | |
Willem de Bruijn | f066e2b | 2014-08-06 15:09:44 -0400 | [diff] [blame] | 436 | sock_tx_timestamp(sk, &shinfo->tx_flags); |
| 437 | if (shinfo->tx_flags & SKBTX_ANY_TSTAMP) |
| 438 | shinfo->tskey = TCP_SKB_CB(skb)->seq + skb->len - 1; |
| 439 | } |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 440 | } |
| 441 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | * Wait for a TCP event. |
| 444 | * |
| 445 | * Note that we don't need to lock the socket, as the upper poll layers |
| 446 | * take care of normal races (between the test and the event) and we don't |
| 447 | * go look at any of the socket buffers directly. |
| 448 | */ |
| 449 | unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 450 | { |
| 451 | unsigned int mask; |
| 452 | struct sock *sk = sock->sk; |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 453 | const struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 454 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
David Majnemer | c3f1dba | 2013-05-31 13:15:38 +0000 | [diff] [blame] | 456 | sock_rps_record_flow(sk); |
| 457 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 458 | sock_poll_wait(file, sk_sleep(sk), wait); |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 459 | |
| 460 | state = sk_state_load(sk); |
| 461 | if (state == TCP_LISTEN) |
Arnaldo Carvalho de Melo | dc40c7b | 2005-08-23 21:52:58 -0700 | [diff] [blame] | 462 | return inet_csk_listen_poll(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | /* Socket is not locked. We are protected from async events |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 465 | * by poll logic and correct handling of state changes |
| 466 | * made by other threads is impossible in any case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | */ |
| 468 | |
| 469 | mask = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | /* |
| 472 | * POLLHUP is certainly not done right. But poll() doesn't |
| 473 | * have a notion of HUP in just one direction, and for a |
| 474 | * socket the read side is more interesting. |
| 475 | * |
| 476 | * Some poll() documentation says that POLLHUP is incompatible |
| 477 | * with the POLLOUT/POLLWR flags, so somebody should check this |
| 478 | * all. But careful, it tends to be safer to return too many |
| 479 | * bits than too few, and you can easily break real applications |
| 480 | * if you don't tell them that something has hung up! |
| 481 | * |
| 482 | * Check-me. |
| 483 | * |
| 484 | * Check number 1. POLLHUP is _UNMASKABLE_ event (see UNIX98 and |
| 485 | * our fs/select.c). It means that after we received EOF, |
| 486 | * poll always returns immediately, making impossible poll() on write() |
| 487 | * in state CLOSE_WAIT. One solution is evident --- to set POLLHUP |
| 488 | * if and only if shutdown has been made in both directions. |
| 489 | * Actually, it is interesting to look how Solaris and DUX |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 490 | * solve this dilemma. I would prefer, if POLLHUP were maskable, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | * then we could set it on SND_SHUTDOWN. BTW examples given |
| 492 | * in Stevens' books assume exactly this behaviour, it explains |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 493 | * why POLLHUP is incompatible with POLLOUT. --ANK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | * |
| 495 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent |
| 496 | * blocking on fresh not-connected or disconnected socket. --ANK |
| 497 | */ |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 498 | if (sk->sk_shutdown == SHUTDOWN_MASK || state == TCP_CLOSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | mask |= POLLHUP; |
| 500 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 501 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 503 | /* Connected or passive Fast Open socket? */ |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 504 | if (state != TCP_SYN_SENT && |
| 505 | (state != TCP_SYN_RECV || tp->fastopen_rsk)) { |
David S. Miller | c700448 | 2008-10-06 10:43:54 -0700 | [diff] [blame] | 506 | int target = sock_rcvlowat(sk, 0, INT_MAX); |
| 507 | |
| 508 | if (tp->urg_seq == tp->copied_seq && |
| 509 | !sock_flag(sk, SOCK_URGINLINE) && |
| 510 | tp->urg_data) |
Alexandra Kossovsky | b634f87 | 2010-03-18 20:29:24 -0700 | [diff] [blame] | 511 | target++; |
David S. Miller | c700448 | 2008-10-06 10:43:54 -0700 | [diff] [blame] | 512 | |
David S. Miller | c700448 | 2008-10-06 10:43:54 -0700 | [diff] [blame] | 513 | if (tp->rcv_nxt - tp->copied_seq >= target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | mask |= POLLIN | POLLRDNORM; |
| 515 | |
| 516 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
Eric Dumazet | 64dc613 | 2013-07-22 20:26:31 -0700 | [diff] [blame] | 517 | if (sk_stream_is_writeable(sk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | mask |= POLLOUT | POLLWRNORM; |
| 519 | } else { /* send SIGIO later */ |
| 520 | set_bit(SOCK_ASYNC_NOSPACE, |
| 521 | &sk->sk_socket->flags); |
| 522 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 523 | |
| 524 | /* Race breaker. If space is freed after |
| 525 | * wspace test but before the flags are set, |
jbaron@akamai.com | 3c71512 | 2015-04-20 20:05:07 +0000 | [diff] [blame] | 526 | * IO signal will be lost. Memory barrier |
| 527 | * pairs with the input side. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | */ |
jbaron@akamai.com | 3c71512 | 2015-04-20 20:05:07 +0000 | [diff] [blame] | 529 | smp_mb__after_atomic(); |
Eric Dumazet | 64dc613 | 2013-07-22 20:26:31 -0700 | [diff] [blame] | 530 | if (sk_stream_is_writeable(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | mask |= POLLOUT | POLLWRNORM; |
| 532 | } |
KOSAKI Motohiro | d84ba63 | 2010-08-24 16:05:48 +0000 | [diff] [blame] | 533 | } else |
| 534 | mask |= POLLOUT | POLLWRNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | if (tp->urg_data & TCP_URG_VALID) |
| 537 | mask |= POLLPRI; |
| 538 | } |
Tom Marshall | a4d2580 | 2010-09-20 15:42:05 -0700 | [diff] [blame] | 539 | /* This barrier is coupled with smp_wmb() in tcp_reset() */ |
| 540 | smp_rmb(); |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 541 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
Tom Marshall | a4d2580 | 2010-09-20 15:42:05 -0700 | [diff] [blame] | 542 | mask |= POLLERR; |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | return mask; |
| 545 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 546 | EXPORT_SYMBOL(tcp_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 549 | { |
| 550 | struct tcp_sock *tp = tcp_sk(sk); |
| 551 | int answ; |
Eric Dumazet | 0e71c55 | 2012-10-21 20:06:56 +0000 | [diff] [blame] | 552 | bool slow; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | switch (cmd) { |
| 555 | case SIOCINQ: |
| 556 | if (sk->sk_state == TCP_LISTEN) |
| 557 | return -EINVAL; |
| 558 | |
Eric Dumazet | 0e71c55 | 2012-10-21 20:06:56 +0000 | [diff] [blame] | 559 | slow = lock_sock_fast(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 561 | answ = 0; |
| 562 | else if (sock_flag(sk, SOCK_URGINLINE) || |
| 563 | !tp->urg_data || |
| 564 | before(tp->urg_seq, tp->copied_seq) || |
| 565 | !before(tp->urg_seq, tp->rcv_nxt)) { |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | answ = tp->rcv_nxt - tp->copied_seq; |
| 568 | |
Eric Dumazet | a3374c4 | 2012-10-18 09:14:12 +0000 | [diff] [blame] | 569 | /* Subtract 1, if FIN was received */ |
| 570 | if (answ && sock_flag(sk, SOCK_DONE)) |
| 571 | answ--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } else |
| 573 | answ = tp->urg_seq - tp->copied_seq; |
Eric Dumazet | 0e71c55 | 2012-10-21 20:06:56 +0000 | [diff] [blame] | 574 | unlock_sock_fast(sk, slow); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | break; |
| 576 | case SIOCATMARK: |
| 577 | answ = tp->urg_data && tp->urg_seq == tp->copied_seq; |
| 578 | break; |
| 579 | case SIOCOUTQ: |
| 580 | if (sk->sk_state == TCP_LISTEN) |
| 581 | return -EINVAL; |
| 582 | |
| 583 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 584 | answ = 0; |
| 585 | else |
| 586 | answ = tp->write_seq - tp->snd_una; |
| 587 | break; |
Mario Schuknecht | 2f4e1b3 | 2011-03-09 14:08:09 -0800 | [diff] [blame] | 588 | case SIOCOUTQNSD: |
| 589 | if (sk->sk_state == TCP_LISTEN) |
| 590 | return -EINVAL; |
| 591 | |
| 592 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 593 | answ = 0; |
| 594 | else |
| 595 | answ = tp->write_seq - tp->snd_nxt; |
| 596 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | default: |
| 598 | return -ENOIOCTLCMD; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 599 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | return put_user(answ, (int __user *)arg); |
| 602 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 603 | EXPORT_SYMBOL(tcp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
| 606 | { |
Eric Dumazet | 4de075e | 2011-09-27 13:25:05 -0400 | [diff] [blame] | 607 | TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_PSH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | tp->pushed_seq = tp->write_seq; |
| 609 | } |
| 610 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 611 | static inline bool forced_push(const struct tcp_sock *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | { |
| 613 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); |
| 614 | } |
| 615 | |
Eric Dumazet | f4a775d | 2014-09-22 16:29:32 -0700 | [diff] [blame] | 616 | static void skb_entail(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | { |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 618 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 352d480 | 2006-11-17 19:59:12 -0200 | [diff] [blame] | 619 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
| 620 | |
| 621 | skb->csum = 0; |
| 622 | tcb->seq = tcb->end_seq = tp->write_seq; |
Eric Dumazet | 4de075e | 2011-09-27 13:25:05 -0400 | [diff] [blame] | 623 | tcb->tcp_flags = TCPHDR_ACK; |
Arnaldo Carvalho de Melo | 352d480 | 2006-11-17 19:59:12 -0200 | [diff] [blame] | 624 | tcb->sacked = 0; |
Eric Dumazet | f4a775d | 2014-09-22 16:29:32 -0700 | [diff] [blame] | 625 | __skb_header_release(skb); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 626 | tcp_add_write_queue_tail(sk, skb); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 627 | sk->sk_wmem_queued += skb->truesize; |
| 628 | sk_mem_charge(sk, skb->truesize); |
David S. Miller | 89ebd19 | 2005-08-23 10:13:06 -0700 | [diff] [blame] | 629 | if (tp->nonagle & TCP_NAGLE_PUSH) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 630 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
Eric Dumazet | 6f021c6 | 2015-08-21 12:30:00 -0700 | [diff] [blame] | 631 | |
| 632 | tcp_slow_start_after_idle_check(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | } |
| 634 | |
Krishna Kumar | afeca34 | 2009-12-10 07:16:52 +0000 | [diff] [blame] | 635 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | { |
Ilpo Järvinen | 33f5f57 | 2008-10-07 14:43:06 -0700 | [diff] [blame] | 637 | if (flags & MSG_OOB) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | tp->snd_up = tp->write_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 641 | /* If a not yet filled skb is pushed, do not send it if |
Eric Dumazet | a181ceb | 2013-12-17 09:58:30 -0800 | [diff] [blame] | 642 | * we have data packets in Qdisc or NIC queues : |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 643 | * Because TX completion will happen shortly, it gives a chance |
| 644 | * to coalesce future sendmsg() payload into this skb, without |
| 645 | * need for a timer, and with no latency trade off. |
| 646 | * As packets containing data payload have a bigger truesize |
Eric Dumazet | a181ceb | 2013-12-17 09:58:30 -0800 | [diff] [blame] | 647 | * than pure acks (dataless) packets, the last checks prevent |
| 648 | * autocorking if we only have an ACK in Qdisc/NIC queues, |
| 649 | * or if TX completion was delayed after we processed ACK packet. |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 650 | */ |
| 651 | static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb, |
| 652 | int size_goal) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | { |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 654 | return skb->len < size_goal && |
| 655 | sysctl_tcp_autocorking && |
Eric Dumazet | a181ceb | 2013-12-17 09:58:30 -0800 | [diff] [blame] | 656 | skb != tcp_write_queue_head(sk) && |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 657 | atomic_read(&sk->sk_wmem_alloc) > skb->truesize; |
| 658 | } |
Krishna Kumar | afeca34 | 2009-12-10 07:16:52 +0000 | [diff] [blame] | 659 | |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 660 | static void tcp_push(struct sock *sk, int flags, int mss_now, |
| 661 | int nonagle, int size_goal) |
| 662 | { |
| 663 | struct tcp_sock *tp = tcp_sk(sk); |
| 664 | struct sk_buff *skb; |
Krishna Kumar | afeca34 | 2009-12-10 07:16:52 +0000 | [diff] [blame] | 665 | |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 666 | if (!tcp_send_head(sk)) |
| 667 | return; |
| 668 | |
| 669 | skb = tcp_write_queue_tail(sk); |
| 670 | if (!(flags & MSG_MORE) || forced_push(tp)) |
| 671 | tcp_mark_push(tp, skb); |
| 672 | |
| 673 | tcp_mark_urg(tp, flags); |
| 674 | |
| 675 | if (tcp_should_autocork(sk, skb, size_goal)) { |
| 676 | |
| 677 | /* avoid atomic op if TSQ_THROTTLED bit is already set */ |
| 678 | if (!test_bit(TSQ_THROTTLED, &tp->tsq_flags)) { |
| 679 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING); |
| 680 | set_bit(TSQ_THROTTLED, &tp->tsq_flags); |
| 681 | } |
Eric Dumazet | a181ceb | 2013-12-17 09:58:30 -0800 | [diff] [blame] | 682 | /* It is possible TX completion already happened |
| 683 | * before we set TSQ_THROTTLED. |
| 684 | */ |
| 685 | if (atomic_read(&sk->sk_wmem_alloc) > skb->truesize) |
| 686 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 688 | |
| 689 | if (flags & MSG_MORE) |
| 690 | nonagle = TCP_NAGLE_CORK; |
| 691 | |
| 692 | __tcp_push_pending_frames(sk, mss_now, nonagle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | } |
| 694 | |
Adrian Bunk | 6ff7751 | 2007-11-06 23:32:26 -0800 | [diff] [blame] | 695 | static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
| 696 | unsigned int offset, size_t len) |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 697 | { |
| 698 | struct tcp_splice_state *tss = rd_desc->arg.data; |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 699 | int ret; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 700 | |
Hannes Frederic Sowa | a60e3cc | 2015-05-21 17:00:00 +0200 | [diff] [blame] | 701 | ret = skb_splice_bits(skb, skb->sk, offset, tss->pipe, |
| 702 | min(rd_desc->count, len), tss->flags, |
| 703 | skb_socket_splice); |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 704 | if (ret > 0) |
| 705 | rd_desc->count -= ret; |
| 706 | return ret; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 707 | } |
| 708 | |
| 709 | static int __tcp_splice_read(struct sock *sk, struct tcp_splice_state *tss) |
| 710 | { |
| 711 | /* Store TCP splice context information in read_descriptor_t. */ |
| 712 | read_descriptor_t rd_desc = { |
| 713 | .arg.data = tss, |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 714 | .count = tss->len, |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 715 | }; |
| 716 | |
| 717 | return tcp_read_sock(sk, &rd_desc, tcp_splice_data_recv); |
| 718 | } |
| 719 | |
| 720 | /** |
| 721 | * tcp_splice_read - splice data from TCP socket to a pipe |
| 722 | * @sock: socket to splice from |
| 723 | * @ppos: position (not valid) |
| 724 | * @pipe: pipe to splice to |
| 725 | * @len: number of bytes to splice |
| 726 | * @flags: splice modifier flags |
| 727 | * |
| 728 | * Description: |
| 729 | * Will read pages from given socket and fill them into a pipe. |
| 730 | * |
| 731 | **/ |
| 732 | ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos, |
| 733 | struct pipe_inode_info *pipe, size_t len, |
| 734 | unsigned int flags) |
| 735 | { |
| 736 | struct sock *sk = sock->sk; |
| 737 | struct tcp_splice_state tss = { |
| 738 | .pipe = pipe, |
| 739 | .len = len, |
| 740 | .flags = flags, |
| 741 | }; |
| 742 | long timeo; |
| 743 | ssize_t spliced; |
| 744 | int ret; |
| 745 | |
Changli Gao | 3a047bf | 2010-07-12 21:00:12 +0000 | [diff] [blame] | 746 | sock_rps_record_flow(sk); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 747 | /* |
| 748 | * We can't seek on a socket input |
| 749 | */ |
| 750 | if (unlikely(*ppos)) |
| 751 | return -ESPIPE; |
| 752 | |
| 753 | ret = spliced = 0; |
| 754 | |
| 755 | lock_sock(sk); |
| 756 | |
Eric Dumazet | 42324c6 | 2009-10-01 15:26:00 -0700 | [diff] [blame] | 757 | timeo = sock_rcvtimeo(sk, sock->file->f_flags & O_NONBLOCK); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 758 | while (tss.len) { |
| 759 | ret = __tcp_splice_read(sk, &tss); |
| 760 | if (ret < 0) |
| 761 | break; |
| 762 | else if (!ret) { |
| 763 | if (spliced) |
| 764 | break; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 765 | if (sock_flag(sk, SOCK_DONE)) |
| 766 | break; |
| 767 | if (sk->sk_err) { |
| 768 | ret = sock_error(sk); |
| 769 | break; |
| 770 | } |
| 771 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 772 | break; |
| 773 | if (sk->sk_state == TCP_CLOSE) { |
| 774 | /* |
| 775 | * This occurs when user tries to read |
| 776 | * from never connected socket. |
| 777 | */ |
| 778 | if (!sock_flag(sk, SOCK_DONE)) |
| 779 | ret = -ENOTCONN; |
| 780 | break; |
| 781 | } |
| 782 | if (!timeo) { |
| 783 | ret = -EAGAIN; |
| 784 | break; |
| 785 | } |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 786 | sk_wait_data(sk, &timeo, NULL); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 787 | if (signal_pending(current)) { |
| 788 | ret = sock_intr_errno(timeo); |
| 789 | break; |
| 790 | } |
| 791 | continue; |
| 792 | } |
| 793 | tss.len -= ret; |
| 794 | spliced += ret; |
| 795 | |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 796 | if (!timeo) |
| 797 | break; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 798 | release_sock(sk); |
| 799 | lock_sock(sk); |
| 800 | |
| 801 | if (sk->sk_err || sk->sk_state == TCP_CLOSE || |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 802 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 803 | signal_pending(current)) |
| 804 | break; |
| 805 | } |
| 806 | |
| 807 | release_sock(sk); |
| 808 | |
| 809 | if (spliced) |
| 810 | return spliced; |
| 811 | |
| 812 | return ret; |
| 813 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 814 | EXPORT_SYMBOL(tcp_splice_read); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 815 | |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 816 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp, |
| 817 | bool force_schedule) |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 818 | { |
| 819 | struct sk_buff *skb; |
| 820 | |
| 821 | /* The TCP header must be at least 32-bit aligned. */ |
| 822 | size = ALIGN(size, 4); |
| 823 | |
Eric Dumazet | 8e4d980 | 2015-05-15 12:39:28 -0700 | [diff] [blame] | 824 | if (unlikely(tcp_under_memory_pressure(sk))) |
| 825 | sk_mem_reclaim_partial(sk); |
| 826 | |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 827 | skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp); |
Eric Dumazet | 8e4d980 | 2015-05-15 12:39:28 -0700 | [diff] [blame] | 828 | if (likely(skb)) { |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 829 | bool mem_scheduled; |
Eric Dumazet | 8e4d980 | 2015-05-15 12:39:28 -0700 | [diff] [blame] | 830 | |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 831 | if (force_schedule) { |
| 832 | mem_scheduled = true; |
Eric Dumazet | 8e4d980 | 2015-05-15 12:39:28 -0700 | [diff] [blame] | 833 | sk_forced_mem_schedule(sk, skb->truesize); |
| 834 | } else { |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 835 | mem_scheduled = sk_wmem_schedule(sk, skb->truesize); |
Eric Dumazet | 8e4d980 | 2015-05-15 12:39:28 -0700 | [diff] [blame] | 836 | } |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 837 | if (likely(mem_scheduled)) { |
Eric Dumazet | a21d457 | 2012-04-10 20:30:48 +0000 | [diff] [blame] | 838 | skb_reserve(skb, sk->sk_prot->max_header); |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 839 | /* |
| 840 | * Make sure that we have exactly size bytes |
| 841 | * available to the caller, no more, no less. |
| 842 | */ |
Eric Dumazet | 16fad69 | 2013-03-14 05:40:32 +0000 | [diff] [blame] | 843 | skb->reserved_tailroom = skb->end - skb->tail - size; |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 844 | return skb; |
| 845 | } |
| 846 | __kfree_skb(skb); |
| 847 | } else { |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 848 | sk->sk_prot->enter_memory_pressure(sk); |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 849 | sk_stream_moderate_sndbuf(sk); |
| 850 | } |
| 851 | return NULL; |
| 852 | } |
| 853 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 854 | static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, |
| 855 | int large_allowed) |
| 856 | { |
| 857 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | 6c09fa0 | 2015-03-05 08:03:06 -0800 | [diff] [blame] | 858 | u32 new_size_goal, size_goal; |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 859 | |
Eric Dumazet | 605ad7f | 2014-12-07 12:22:18 -0800 | [diff] [blame] | 860 | if (!large_allowed || !sk_can_gso(sk)) |
| 861 | return mss_now; |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 862 | |
Eric Dumazet | 6c09fa0 | 2015-03-05 08:03:06 -0800 | [diff] [blame] | 863 | /* Note : tcp_tso_autosize() will eventually split this later */ |
| 864 | new_size_goal = sk->sk_gso_max_size - 1 - MAX_TCP_HEADER; |
Eric Dumazet | 605ad7f | 2014-12-07 12:22:18 -0800 | [diff] [blame] | 865 | new_size_goal = tcp_bound_to_half_wnd(tp, new_size_goal); |
Eric Dumazet | 95bd09e | 2013-08-27 05:46:32 -0700 | [diff] [blame] | 866 | |
Eric Dumazet | 605ad7f | 2014-12-07 12:22:18 -0800 | [diff] [blame] | 867 | /* We try hard to avoid divides here */ |
| 868 | size_goal = tp->gso_segs * mss_now; |
| 869 | if (unlikely(new_size_goal < size_goal || |
| 870 | new_size_goal >= size_goal + mss_now)) { |
| 871 | tp->gso_segs = min_t(u16, new_size_goal / mss_now, |
| 872 | sk->sk_gso_max_segs); |
| 873 | size_goal = tp->gso_segs * mss_now; |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 874 | } |
| 875 | |
Eric Dumazet | 605ad7f | 2014-12-07 12:22:18 -0800 | [diff] [blame] | 876 | return max(size_goal, mss_now); |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | static int tcp_send_mss(struct sock *sk, int *size_goal, int flags) |
| 880 | { |
| 881 | int mss_now; |
| 882 | |
| 883 | mss_now = tcp_current_mss(sk); |
| 884 | *size_goal = tcp_xmit_size_goal(sk, mss_now, !(flags & MSG_OOB)); |
| 885 | |
| 886 | return mss_now; |
| 887 | } |
| 888 | |
Eric Dumazet | 64022d0 | 2012-12-01 13:07:02 +0000 | [diff] [blame] | 889 | static ssize_t do_tcp_sendpages(struct sock *sk, struct page *page, int offset, |
| 890 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | { |
| 892 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 893 | int mss_now, size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | int err; |
| 895 | ssize_t copied; |
| 896 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 897 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 898 | /* Wait for a connection to finish. One exception is TCP Fast Open |
| 899 | * (passive side) where data is allowed to be sent before a connection |
| 900 | * is fully established. |
| 901 | */ |
| 902 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && |
| 903 | !tcp_passive_fastopen(sk)) { |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 904 | err = sk_stream_wait_connect(sk, &timeo); |
| 905 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | goto out_err; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 907 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 910 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 911 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | copied = 0; |
| 913 | |
| 914 | err = -EPIPE; |
| 915 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
Ilpo Järvinen | 0d6a775 | 2009-02-28 04:44:41 +0000 | [diff] [blame] | 916 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | |
Eric Dumazet | 64022d0 | 2012-12-01 13:07:02 +0000 | [diff] [blame] | 918 | while (size > 0) { |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 919 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
Eric Dumazet | 38ba0a6 | 2012-04-23 17:48:27 +0000 | [diff] [blame] | 920 | int copy, i; |
Eric Dumazet | 38ba0a6 | 2012-04-23 17:48:27 +0000 | [diff] [blame] | 921 | bool can_coalesce; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 923 | if (!tcp_send_head(sk) || (copy = size_goal - skb->len) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | new_segment: |
| 925 | if (!sk_stream_memory_free(sk)) |
| 926 | goto wait_for_sndbuf; |
| 927 | |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 928 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation, |
| 929 | skb_queue_empty(&sk->sk_write_queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | if (!skb) |
| 931 | goto wait_for_memory; |
| 932 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 933 | skb_entail(sk, skb); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 934 | copy = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | } |
| 936 | |
| 937 | if (copy > size) |
| 938 | copy = size; |
| 939 | |
| 940 | i = skb_shinfo(skb)->nr_frags; |
| 941 | can_coalesce = skb_can_coalesce(skb, i, page, offset); |
| 942 | if (!can_coalesce && i >= MAX_SKB_FRAGS) { |
| 943 | tcp_mark_push(tp, skb); |
| 944 | goto new_segment; |
| 945 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 946 | if (!sk_wmem_schedule(sk, copy)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | goto wait_for_memory; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | if (can_coalesce) { |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 950 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } else { |
| 952 | get_page(page); |
| 953 | skb_fill_page_desc(skb, i, page, offset, copy); |
| 954 | } |
Pravin B Shelar | c9af6db | 2013-02-11 09:27:41 +0000 | [diff] [blame] | 955 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
Eric Dumazet | cef401d | 2013-01-25 20:34:37 +0000 | [diff] [blame] | 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | skb->len += copy; |
| 958 | skb->data_len += copy; |
| 959 | skb->truesize += copy; |
| 960 | sk->sk_wmem_queued += copy; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 961 | sk_mem_charge(sk, copy); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 962 | skb->ip_summed = CHECKSUM_PARTIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | tp->write_seq += copy; |
| 964 | TCP_SKB_CB(skb)->end_seq += copy; |
Eric Dumazet | cd7d849 | 2014-09-24 04:11:22 -0700 | [diff] [blame] | 965 | tcp_skb_pcount_set(skb, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | if (!copied) |
Eric Dumazet | 4de075e | 2011-09-27 13:25:05 -0400 | [diff] [blame] | 968 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
| 970 | copied += copy; |
Eric Dumazet | 64022d0 | 2012-12-01 13:07:02 +0000 | [diff] [blame] | 971 | offset += copy; |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 972 | size -= copy; |
| 973 | if (!size) { |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 974 | tcp_tx_timestamp(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | goto out; |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 976 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Herbert Xu | 69d1506 | 2008-03-22 15:47:05 -0700 | [diff] [blame] | 978 | if (skb->len < size_goal || (flags & MSG_OOB)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | continue; |
| 980 | |
| 981 | if (forced_push(tp)) { |
| 982 | tcp_mark_push(tp, skb); |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 983 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 984 | } else if (skb == tcp_send_head(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | tcp_push_one(sk, mss_now); |
| 986 | continue; |
| 987 | |
| 988 | wait_for_sndbuf: |
| 989 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 990 | wait_for_memory: |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 991 | tcp_push(sk, flags & ~MSG_MORE, mss_now, |
| 992 | TCP_NAGLE_PUSH, size_goal); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 994 | err = sk_stream_wait_memory(sk, &timeo); |
| 995 | if (err != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | goto do_error; |
| 997 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 998 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | out: |
Eric Dumazet | 35f9c09 | 2012-04-05 03:05:35 +0000 | [diff] [blame] | 1002 | if (copied && !(flags & MSG_SENDPAGE_NOTLAST)) |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 1003 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | return copied; |
| 1005 | |
| 1006 | do_error: |
| 1007 | if (copied) |
| 1008 | goto out; |
| 1009 | out_err: |
Jason Baron | ce5ec44 | 2015-05-20 15:52:53 +0000 | [diff] [blame] | 1010 | /* make sure we wake any epoll edge trigger waiter */ |
| 1011 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN)) |
| 1012 | sk->sk_write_space(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | return sk_stream_error(sk, flags, err); |
| 1014 | } |
| 1015 | |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 1016 | int tcp_sendpage(struct sock *sk, struct page *page, int offset, |
| 1017 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | { |
| 1019 | ssize_t res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | if (!(sk->sk_route_caps & NETIF_F_SG) || |
Herbert Xu | 8648b30 | 2006-06-17 22:06:05 -0700 | [diff] [blame] | 1022 | !(sk->sk_route_caps & NETIF_F_ALL_CSUM)) |
Changli Gao | 7ba4291 | 2010-07-10 20:41:55 +0000 | [diff] [blame] | 1023 | return sock_no_sendpage(sk->sk_socket, page, offset, size, |
| 1024 | flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | lock_sock(sk); |
Eric Dumazet | 64022d0 | 2012-12-01 13:07:02 +0000 | [diff] [blame] | 1027 | res = do_tcp_sendpages(sk, page, offset, size, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | release_sock(sk); |
| 1029 | return res; |
| 1030 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1031 | EXPORT_SYMBOL(tcp_sendpage); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | |
Eric Dumazet | 690e99c | 2011-11-28 00:27:47 +0000 | [diff] [blame] | 1033 | static inline int select_size(const struct sock *sk, bool sg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 1035 | const struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1036 | int tmp = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Krishna Kumar | def87cf | 2009-12-10 07:16:59 +0000 | [diff] [blame] | 1038 | if (sg) { |
Eric Dumazet | f07d960 | 2011-11-28 22:41:47 +0000 | [diff] [blame] | 1039 | if (sk_can_gso(sk)) { |
| 1040 | /* Small frames wont use a full page: |
| 1041 | * Payload will immediately follow tcp header. |
| 1042 | */ |
| 1043 | tmp = SKB_WITH_OVERHEAD(2048 - MAX_TCP_HEADER); |
| 1044 | } else { |
David S. Miller | b4e26f5 | 2005-07-05 15:20:27 -0700 | [diff] [blame] | 1045 | int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER); |
| 1046 | |
| 1047 | if (tmp >= pgbreak && |
| 1048 | tmp <= pgbreak + (MAX_SKB_FRAGS - 1) * PAGE_SIZE) |
| 1049 | tmp = pgbreak; |
| 1050 | } |
| 1051 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | return tmp; |
| 1054 | } |
| 1055 | |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1056 | void tcp_free_fastopen_req(struct tcp_sock *tp) |
| 1057 | { |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1058 | if (tp->fastopen_req) { |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1059 | kfree(tp->fastopen_req); |
| 1060 | tp->fastopen_req = NULL; |
| 1061 | } |
| 1062 | } |
| 1063 | |
Eric Dumazet | f5ddcbb | 2014-02-20 10:09:18 -0800 | [diff] [blame] | 1064 | static int tcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg, |
| 1065 | int *copied, size_t size) |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1066 | { |
| 1067 | struct tcp_sock *tp = tcp_sk(sk); |
| 1068 | int err, flags; |
| 1069 | |
| 1070 | if (!(sysctl_tcp_fastopen & TFO_CLIENT_ENABLE)) |
| 1071 | return -EOPNOTSUPP; |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 1072 | if (tp->fastopen_req) |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1073 | return -EALREADY; /* Another Fast Open is in progress */ |
| 1074 | |
| 1075 | tp->fastopen_req = kzalloc(sizeof(struct tcp_fastopen_request), |
| 1076 | sk->sk_allocation); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 1077 | if (unlikely(!tp->fastopen_req)) |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1078 | return -ENOBUFS; |
| 1079 | tp->fastopen_req->data = msg; |
Eric Dumazet | f5ddcbb | 2014-02-20 10:09:18 -0800 | [diff] [blame] | 1080 | tp->fastopen_req->size = size; |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1081 | |
| 1082 | flags = (msg->msg_flags & MSG_DONTWAIT) ? O_NONBLOCK : 0; |
| 1083 | err = __inet_stream_connect(sk->sk_socket, msg->msg_name, |
| 1084 | msg->msg_namelen, flags); |
Eric Dumazet | f5ddcbb | 2014-02-20 10:09:18 -0800 | [diff] [blame] | 1085 | *copied = tp->fastopen_req->copied; |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1086 | tcp_free_fastopen_req(tp); |
| 1087 | return err; |
| 1088 | } |
| 1089 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1090 | int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | struct tcp_sock *tp = tcp_sk(sk); |
| 1093 | struct sk_buff *skb; |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1094 | int flags, err, copied = 0; |
| 1095 | int mss_now = 0, size_goal, copied_syn = 0; |
Eric Dumazet | 690e99c | 2011-11-28 00:27:47 +0000 | [diff] [blame] | 1096 | bool sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | long timeo; |
| 1098 | |
| 1099 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
| 1101 | flags = msg->msg_flags; |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1102 | if (flags & MSG_FASTOPEN) { |
Eric Dumazet | f5ddcbb | 2014-02-20 10:09:18 -0800 | [diff] [blame] | 1103 | err = tcp_sendmsg_fastopen(sk, msg, &copied_syn, size); |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1104 | if (err == -EINPROGRESS && copied_syn > 0) |
| 1105 | goto out; |
| 1106 | else if (err) |
| 1107 | goto out_err; |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1108 | } |
| 1109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 1111 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 1112 | /* Wait for a connection to finish. One exception is TCP Fast Open |
| 1113 | * (passive side) where data is allowed to be sent before a connection |
| 1114 | * is fully established. |
| 1115 | */ |
| 1116 | if (((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) && |
| 1117 | !tcp_passive_fastopen(sk)) { |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 1118 | err = sk_stream_wait_connect(sk, &timeo); |
| 1119 | if (err != 0) |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1120 | goto do_error; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 1121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1123 | if (unlikely(tp->repair)) { |
| 1124 | if (tp->repair_queue == TCP_RECV_QUEUE) { |
| 1125 | copied = tcp_send_rcvq(sk, msg, size); |
Christoph Paasch | 5924f17 | 2014-06-28 18:26:37 +0200 | [diff] [blame] | 1126 | goto out_nopush; |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1127 | } |
| 1128 | |
| 1129 | err = -EINVAL; |
| 1130 | if (tp->repair_queue == TCP_NO_QUEUE) |
| 1131 | goto out_err; |
| 1132 | |
| 1133 | /* 'common' sending to sendq */ |
| 1134 | } |
| 1135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | /* This should be in poll */ |
| 1137 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1138 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 1139 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | /* Ok commence sending. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | copied = 0; |
| 1143 | |
| 1144 | err = -EPIPE; |
| 1145 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
Ilpo Järvinen | 0d6a775 | 2009-02-28 04:44:41 +0000 | [diff] [blame] | 1146 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Eric Dumazet | 690e99c | 2011-11-28 00:27:47 +0000 | [diff] [blame] | 1148 | sg = !!(sk->sk_route_caps & NETIF_F_SG); |
Krishna Kumar | def87cf | 2009-12-10 07:16:59 +0000 | [diff] [blame] | 1149 | |
Al Viro | 01e97e6 | 2014-12-15 21:39:31 -0500 | [diff] [blame] | 1150 | while (msg_data_left(msg)) { |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1151 | int copy = 0; |
| 1152 | int max = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1154 | skb = tcp_write_queue_tail(sk); |
| 1155 | if (tcp_send_head(sk)) { |
| 1156 | if (skb->ip_summed == CHECKSUM_NONE) |
| 1157 | max = mss_now; |
| 1158 | copy = max - skb->len; |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1161 | if (copy <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | new_segment: |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1163 | /* Allocate new segment. If the interface is SG, |
| 1164 | * allocate skb fitting to single page. |
| 1165 | */ |
| 1166 | if (!sk_stream_memory_free(sk)) |
| 1167 | goto wait_for_sndbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1169 | skb = sk_stream_alloc_skb(sk, |
| 1170 | select_size(sk, sg), |
Eric Dumazet | eb93447 | 2015-05-19 13:26:55 -0700 | [diff] [blame] | 1171 | sk->sk_allocation, |
| 1172 | skb_queue_empty(&sk->sk_write_queue)); |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1173 | if (!skb) |
| 1174 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1176 | /* |
| 1177 | * Check whether we can use HW checksum. |
| 1178 | */ |
| 1179 | if (sk->sk_route_caps & NETIF_F_ALL_CSUM) |
| 1180 | skb->ip_summed = CHECKSUM_PARTIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1182 | skb_entail(sk, skb); |
| 1183 | copy = size_goal; |
| 1184 | max = size_goal; |
Andrey Vagin | 9d186ca | 2014-08-13 16:03:10 +0400 | [diff] [blame] | 1185 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1186 | /* All packets are restored as if they have |
| 1187 | * already been sent. skb_mstamp isn't set to |
| 1188 | * avoid wrong rtt estimation. |
| 1189 | */ |
| 1190 | if (tp->repair) |
| 1191 | TCP_SKB_CB(skb)->sacked |= TCPCB_REPAIRED; |
| 1192 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1194 | /* Try to append data to the end of skb. */ |
Al Viro | 01e97e6 | 2014-12-15 21:39:31 -0500 | [diff] [blame] | 1195 | if (copy > msg_data_left(msg)) |
| 1196 | copy = msg_data_left(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1198 | /* Where to copy to? */ |
| 1199 | if (skb_availroom(skb) > 0) { |
| 1200 | /* We have some space in skb head. Superb! */ |
| 1201 | copy = min_t(int, copy, skb_availroom(skb)); |
| 1202 | err = skb_add_data_nocache(sk, skb, &msg->msg_iter, copy); |
| 1203 | if (err) |
| 1204 | goto do_fault; |
| 1205 | } else { |
| 1206 | bool merge = true; |
| 1207 | int i = skb_shinfo(skb)->nr_frags; |
| 1208 | struct page_frag *pfrag = sk_page_frag(sk); |
Eric Dumazet | 761965e | 2011-12-04 07:05:17 +0000 | [diff] [blame] | 1209 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1210 | if (!sk_page_frag_refill(sk, pfrag)) |
| 1211 | goto wait_for_memory; |
Eric Dumazet | 761965e | 2011-12-04 07:05:17 +0000 | [diff] [blame] | 1212 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1213 | if (!skb_can_coalesce(skb, i, pfrag->page, |
| 1214 | pfrag->offset)) { |
| 1215 | if (i == MAX_SKB_FRAGS || !sg) { |
| 1216 | tcp_mark_push(tp, skb); |
| 1217 | goto new_segment; |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1218 | } |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1219 | merge = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } |
| 1221 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1222 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1224 | if (!sk_wmem_schedule(sk, copy)) |
| 1225 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1227 | err = skb_copy_to_page_nocache(sk, &msg->msg_iter, skb, |
| 1228 | pfrag->page, |
| 1229 | pfrag->offset, |
| 1230 | copy); |
| 1231 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | goto do_error; |
| 1233 | |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1234 | /* Update the skb. */ |
| 1235 | if (merge) { |
| 1236 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
| 1237 | } else { |
| 1238 | skb_fill_page_desc(skb, i, pfrag->page, |
| 1239 | pfrag->offset, copy); |
| 1240 | get_page(pfrag->page); |
| 1241 | } |
| 1242 | pfrag->offset += copy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1244 | |
| 1245 | if (!copied) |
| 1246 | TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_PSH; |
| 1247 | |
| 1248 | tp->write_seq += copy; |
| 1249 | TCP_SKB_CB(skb)->end_seq += copy; |
| 1250 | tcp_skb_pcount_set(skb, 0); |
| 1251 | |
| 1252 | copied += copy; |
Al Viro | 01e97e6 | 2014-12-15 21:39:31 -0500 | [diff] [blame] | 1253 | if (!msg_data_left(msg)) { |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1254 | tcp_tx_timestamp(sk, skb); |
| 1255 | goto out; |
| 1256 | } |
| 1257 | |
| 1258 | if (skb->len < max || (flags & MSG_OOB) || unlikely(tp->repair)) |
| 1259 | continue; |
| 1260 | |
| 1261 | if (forced_push(tp)) { |
| 1262 | tcp_mark_push(tp, skb); |
| 1263 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
| 1264 | } else if (skb == tcp_send_head(sk)) |
| 1265 | tcp_push_one(sk, mss_now); |
| 1266 | continue; |
| 1267 | |
| 1268 | wait_for_sndbuf: |
| 1269 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1270 | wait_for_memory: |
| 1271 | if (copied) |
| 1272 | tcp_push(sk, flags & ~MSG_MORE, mss_now, |
| 1273 | TCP_NAGLE_PUSH, size_goal); |
| 1274 | |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 1275 | err = sk_stream_wait_memory(sk, &timeo); |
| 1276 | if (err != 0) |
Al Viro | 57be5bd | 2014-11-28 13:40:20 -0500 | [diff] [blame] | 1277 | goto do_error; |
| 1278 | |
| 1279 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | } |
| 1281 | |
| 1282 | out: |
Andrew Vagin | ec34232 | 2012-11-15 04:03:17 +0000 | [diff] [blame] | 1283 | if (copied) |
Eric Dumazet | f54b311 | 2013-12-05 22:36:05 -0800 | [diff] [blame] | 1284 | tcp_push(sk, flags, mss_now, tp->nonagle, size_goal); |
Christoph Paasch | 5924f17 | 2014-06-28 18:26:37 +0200 | [diff] [blame] | 1285 | out_nopush: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | release_sock(sk); |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1287 | return copied + copied_syn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | |
| 1289 | do_fault: |
| 1290 | if (!skb->len) { |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1291 | tcp_unlink_write_queue(skb, sk); |
| 1292 | /* It is the one place in all of TCP, except connection |
| 1293 | * reset, where we can be unlinking the send_head. |
| 1294 | */ |
| 1295 | tcp_check_send_head(sk, skb); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1296 | sk_wmem_free_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | } |
| 1298 | |
| 1299 | do_error: |
Yuchung Cheng | cf60af0 | 2012-07-19 06:43:09 +0000 | [diff] [blame] | 1300 | if (copied + copied_syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | goto out; |
| 1302 | out_err: |
| 1303 | err = sk_stream_error(sk, flags, err); |
Jason Baron | ce5ec44 | 2015-05-20 15:52:53 +0000 | [diff] [blame] | 1304 | /* make sure we wake any epoll edge trigger waiter */ |
| 1305 | if (unlikely(skb_queue_len(&sk->sk_write_queue) == 0 && err == -EAGAIN)) |
| 1306 | sk->sk_write_space(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | release_sock(sk); |
| 1308 | return err; |
| 1309 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1310 | EXPORT_SYMBOL(tcp_sendmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
| 1312 | /* |
| 1313 | * Handle reading urgent data. BSD has very simple semantics for |
| 1314 | * this, no blocking and very strange errors 8) |
| 1315 | */ |
| 1316 | |
Rami Rosen | 377f0a0 | 2009-03-31 14:43:17 -0700 | [diff] [blame] | 1317 | static int tcp_recv_urg(struct sock *sk, struct msghdr *msg, int len, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | { |
| 1319 | struct tcp_sock *tp = tcp_sk(sk); |
| 1320 | |
| 1321 | /* No URG data to read. */ |
| 1322 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || |
| 1323 | tp->urg_data == TCP_URG_READ) |
| 1324 | return -EINVAL; /* Yes this is right ! */ |
| 1325 | |
| 1326 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) |
| 1327 | return -ENOTCONN; |
| 1328 | |
| 1329 | if (tp->urg_data & TCP_URG_VALID) { |
| 1330 | int err = 0; |
| 1331 | char c = tp->urg_data; |
| 1332 | |
| 1333 | if (!(flags & MSG_PEEK)) |
| 1334 | tp->urg_data = TCP_URG_READ; |
| 1335 | |
| 1336 | /* Read urgent data. */ |
| 1337 | msg->msg_flags |= MSG_OOB; |
| 1338 | |
| 1339 | if (len > 0) { |
| 1340 | if (!(flags & MSG_TRUNC)) |
Al Viro | 7eab8d9 | 2014-04-06 21:51:23 -0400 | [diff] [blame] | 1341 | err = memcpy_to_msg(msg, &c, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | len = 1; |
| 1343 | } else |
| 1344 | msg->msg_flags |= MSG_TRUNC; |
| 1345 | |
| 1346 | return err ? -EFAULT : len; |
| 1347 | } |
| 1348 | |
| 1349 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 1350 | return 0; |
| 1351 | |
| 1352 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and |
| 1353 | * the available implementations agree in this case: |
| 1354 | * this call should never block, independent of the |
| 1355 | * blocking state of the socket. |
| 1356 | * Mike <pall@rz.uni-karlsruhe.de> |
| 1357 | */ |
| 1358 | return -EAGAIN; |
| 1359 | } |
| 1360 | |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1361 | static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len) |
| 1362 | { |
| 1363 | struct sk_buff *skb; |
| 1364 | int copied = 0, err = 0; |
| 1365 | |
| 1366 | /* XXX -- need to support SO_PEEK_OFF */ |
| 1367 | |
| 1368 | skb_queue_walk(&sk->sk_write_queue, skb) { |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 1369 | err = skb_copy_datagram_msg(skb, 0, msg, skb->len); |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1370 | if (err) |
| 1371 | break; |
| 1372 | |
| 1373 | copied += skb->len; |
| 1374 | } |
| 1375 | |
| 1376 | return err ?: copied; |
| 1377 | } |
| 1378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | /* Clean up the receive buffer for full frames taken by the user, |
| 1380 | * then send an ACK if necessary. COPIED is the number of bytes |
| 1381 | * tcp_recvmsg has given to the user so far, it speeds up the |
| 1382 | * calculation of whether or not we must ACK for the sake of |
| 1383 | * a window update. |
| 1384 | */ |
Dan Williams | 3f33407 | 2013-12-30 17:12:07 -0800 | [diff] [blame] | 1385 | static void tcp_cleanup_rbuf(struct sock *sk, int copied) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | { |
| 1387 | struct tcp_sock *tp = tcp_sk(sk); |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1388 | bool time_to_ack = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
| 1391 | |
Ilpo Järvinen | d792c10 | 2009-11-13 13:56:33 -0800 | [diff] [blame] | 1392 | WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq), |
Joe Perches | 2af6fd8 | 2010-10-30 11:08:53 +0000 | [diff] [blame] | 1393 | "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n", |
Ilpo Järvinen | d792c10 | 2009-11-13 13:56:33 -0800 | [diff] [blame] | 1394 | tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1396 | if (inet_csk_ack_scheduled(sk)) { |
| 1397 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | /* Delayed ACKs frequently hit locked sockets during bulk |
| 1399 | * receive. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1400 | if (icsk->icsk_ack.blocked || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | /* Once-per-two-segments ACK was not sent by tcp_input.c */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1402 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | /* |
| 1404 | * If this read emptied read buffer, we send ACK, if |
| 1405 | * connection is not bidirectional, user drained |
| 1406 | * receive buffer and there was a small segment |
| 1407 | * in queue. |
| 1408 | */ |
Alexey Kuznetsov | 1ef9696 | 2006-09-19 12:52:50 -0700 | [diff] [blame] | 1409 | (copied > 0 && |
| 1410 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) || |
| 1411 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && |
| 1412 | !icsk->icsk_ack.pingpong)) && |
| 1413 | !atomic_read(&sk->sk_rmem_alloc))) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1414 | time_to_ack = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | /* We send an ACK if we can now advertise a non-zero window |
| 1418 | * which has been raised "significantly". |
| 1419 | * |
| 1420 | * Even if window raised up to infinity, do not send window open ACK |
| 1421 | * in states, where we will not receive more. It is useless. |
| 1422 | */ |
| 1423 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
| 1424 | __u32 rcv_window_now = tcp_receive_window(tp); |
| 1425 | |
| 1426 | /* Optimize, __tcp_select_window() is not cheap. */ |
| 1427 | if (2*rcv_window_now <= tp->window_clamp) { |
| 1428 | __u32 new_window = __tcp_select_window(sk); |
| 1429 | |
| 1430 | /* Send ACK now, if this read freed lots of space |
| 1431 | * in our buffer. Certainly, new_window is new window. |
| 1432 | * We can advertise it now, if it is not less than current one. |
| 1433 | * "Lots" means "at least twice" here. |
| 1434 | */ |
| 1435 | if (new_window && new_window >= 2 * rcv_window_now) |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 1436 | time_to_ack = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | } |
| 1438 | } |
| 1439 | if (time_to_ack) |
| 1440 | tcp_send_ack(sk); |
| 1441 | } |
| 1442 | |
| 1443 | static void tcp_prequeue_process(struct sock *sk) |
| 1444 | { |
| 1445 | struct sk_buff *skb; |
| 1446 | struct tcp_sock *tp = tcp_sk(sk); |
| 1447 | |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 1448 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPPREQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | /* RX process wants to run with disabled BHs, though it is not |
| 1451 | * necessary */ |
| 1452 | local_bh_disable(); |
| 1453 | while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 1454 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | local_bh_enable(); |
| 1456 | |
| 1457 | /* Clear memory counter. */ |
| 1458 | tp->ucopy.memory = 0; |
| 1459 | } |
| 1460 | |
Eric Dumazet | f26845b | 2013-01-09 20:59:09 +0000 | [diff] [blame] | 1461 | static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | { |
| 1463 | struct sk_buff *skb; |
| 1464 | u32 offset; |
| 1465 | |
Eric Dumazet | f26845b | 2013-01-09 20:59:09 +0000 | [diff] [blame] | 1466 | while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | offset = seq - TCP_SKB_CB(skb)->seq; |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1468 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | offset--; |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1470 | if (offset < skb->len || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | *off = offset; |
| 1472 | return skb; |
| 1473 | } |
Eric Dumazet | f26845b | 2013-01-09 20:59:09 +0000 | [diff] [blame] | 1474 | /* This looks weird, but this can happen if TCP collapsing |
| 1475 | * splitted a fat GRO packet, while we released socket lock |
| 1476 | * in skb_splice_bits() |
| 1477 | */ |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1478 | sk_eat_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | } |
| 1480 | return NULL; |
| 1481 | } |
| 1482 | |
| 1483 | /* |
| 1484 | * This routine provides an alternative to tcp_recvmsg() for routines |
| 1485 | * that would like to handle copying from skbuffs directly in 'sendfile' |
| 1486 | * fashion. |
| 1487 | * Note: |
| 1488 | * - It is assumed that the socket was locked by the caller. |
| 1489 | * - The routine does not block. |
| 1490 | * - At present, there is no support for reading OOB data |
| 1491 | * or for 'peeking' the socket using this routine |
| 1492 | * (although both would be easy to implement). |
| 1493 | */ |
| 1494 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, |
| 1495 | sk_read_actor_t recv_actor) |
| 1496 | { |
| 1497 | struct sk_buff *skb; |
| 1498 | struct tcp_sock *tp = tcp_sk(sk); |
| 1499 | u32 seq = tp->copied_seq; |
| 1500 | u32 offset; |
| 1501 | int copied = 0; |
| 1502 | |
| 1503 | if (sk->sk_state == TCP_LISTEN) |
| 1504 | return -ENOTCONN; |
| 1505 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { |
| 1506 | if (offset < skb->len) { |
Octavian Purdila | 374e7b5 | 2008-07-03 03:31:21 -0700 | [diff] [blame] | 1507 | int used; |
| 1508 | size_t len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | |
| 1510 | len = skb->len - offset; |
| 1511 | /* Stop reading if we hit a patch of urgent data */ |
| 1512 | if (tp->urg_data) { |
| 1513 | u32 urg_offset = tp->urg_seq - seq; |
| 1514 | if (urg_offset < len) |
| 1515 | len = urg_offset; |
| 1516 | if (!len) |
| 1517 | break; |
| 1518 | } |
| 1519 | used = recv_actor(desc, skb, offset, len); |
Eric Dumazet | ff905b1 | 2013-01-10 07:06:10 +0000 | [diff] [blame] | 1520 | if (used <= 0) { |
Jens Axboe | ddb61a5 | 2007-06-23 23:07:50 -0700 | [diff] [blame] | 1521 | if (!copied) |
| 1522 | copied = used; |
| 1523 | break; |
| 1524 | } else if (used <= len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | seq += used; |
| 1526 | copied += used; |
| 1527 | offset += used; |
| 1528 | } |
Willy Tarreau | 02275a2 | 2012-12-02 11:49:27 +0000 | [diff] [blame] | 1529 | /* If recv_actor drops the lock (e.g. TCP splice |
Octavian Purdila | 293ad60 | 2008-06-04 15:45:58 -0700 | [diff] [blame] | 1530 | * receive) the skb pointer might be invalid when |
| 1531 | * getting here: tcp_collapse might have deleted it |
| 1532 | * while aggregating skbs from the socket queue. |
| 1533 | */ |
Willy Tarreau | 02275a2 | 2012-12-02 11:49:27 +0000 | [diff] [blame] | 1534 | skb = tcp_recv_skb(sk, seq - 1, &offset); |
| 1535 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | break; |
Willy Tarreau | 02275a2 | 2012-12-02 11:49:27 +0000 | [diff] [blame] | 1537 | /* TCP coalescing might have appended data to the skb. |
| 1538 | * Try to splice more frags |
| 1539 | */ |
| 1540 | if (offset + 1 != skb->len) |
| 1541 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | } |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1543 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) { |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1544 | sk_eat_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | ++seq; |
| 1546 | break; |
| 1547 | } |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1548 | sk_eat_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | if (!desc->count) |
| 1550 | break; |
Steven J. Magnani | baff42a | 2010-03-30 13:56:01 -0700 | [diff] [blame] | 1551 | tp->copied_seq = seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | } |
| 1553 | tp->copied_seq = seq; |
| 1554 | |
| 1555 | tcp_rcv_space_adjust(sk); |
| 1556 | |
| 1557 | /* Clean up data we have read: This will do ACK frames. */ |
Eric Dumazet | f26845b | 2013-01-09 20:59:09 +0000 | [diff] [blame] | 1558 | if (copied > 0) { |
| 1559 | tcp_recv_skb(sk, seq, &offset); |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1560 | tcp_cleanup_rbuf(sk, copied); |
Eric Dumazet | f26845b | 2013-01-09 20:59:09 +0000 | [diff] [blame] | 1561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | return copied; |
| 1563 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1564 | EXPORT_SYMBOL(tcp_read_sock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
| 1566 | /* |
| 1567 | * This routine copies from a sock struct into the user buffer. |
| 1568 | * |
| 1569 | * Technical note: in 2.3 we work on _locked_ socket, so that |
| 1570 | * tricks with *seq access order and skb->users are not required. |
| 1571 | * Probably, code can be easily improved even more. |
| 1572 | */ |
| 1573 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1574 | int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, |
| 1575 | int flags, int *addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | { |
| 1577 | struct tcp_sock *tp = tcp_sk(sk); |
| 1578 | int copied = 0; |
| 1579 | u32 peek_seq; |
| 1580 | u32 *seq; |
| 1581 | unsigned long used; |
| 1582 | int err; |
| 1583 | int target; /* Read at least this many bytes */ |
| 1584 | long timeo; |
| 1585 | struct task_struct *user_recv = NULL; |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 1586 | struct sk_buff *skb, *last; |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1587 | u32 urg_hole = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 1589 | if (unlikely(flags & MSG_ERRQUEUE)) |
Willem de Bruijn | f4713a3 | 2014-11-26 14:53:02 -0500 | [diff] [blame] | 1590 | return inet_recv_error(sk, msg, len, addr_len); |
Willem de Bruijn | 4ed2d76 | 2014-08-04 22:11:49 -0400 | [diff] [blame] | 1591 | |
Eliezer Tamir | cbf5500 | 2013-07-08 16:20:34 +0300 | [diff] [blame] | 1592 | if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) && |
| 1593 | (sk->sk_state == TCP_ESTABLISHED)) |
| 1594 | sk_busy_loop(sk, nonblock); |
Eliezer Tamir | d30e383 | 2013-06-10 11:40:10 +0300 | [diff] [blame] | 1595 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | lock_sock(sk); |
| 1597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | err = -ENOTCONN; |
| 1599 | if (sk->sk_state == TCP_LISTEN) |
| 1600 | goto out; |
| 1601 | |
| 1602 | timeo = sock_rcvtimeo(sk, nonblock); |
| 1603 | |
| 1604 | /* Urgent data needs to be handled specially. */ |
| 1605 | if (flags & MSG_OOB) |
| 1606 | goto recv_urg; |
| 1607 | |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1608 | if (unlikely(tp->repair)) { |
| 1609 | err = -EPERM; |
| 1610 | if (!(flags & MSG_PEEK)) |
| 1611 | goto out; |
| 1612 | |
| 1613 | if (tp->repair_queue == TCP_SEND_QUEUE) |
| 1614 | goto recv_sndq; |
| 1615 | |
| 1616 | err = -EINVAL; |
| 1617 | if (tp->repair_queue == TCP_NO_QUEUE) |
| 1618 | goto out; |
| 1619 | |
| 1620 | /* 'common' recv queue MSG_PEEK-ing */ |
| 1621 | } |
| 1622 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | seq = &tp->copied_seq; |
| 1624 | if (flags & MSG_PEEK) { |
| 1625 | peek_seq = tp->copied_seq; |
| 1626 | seq = &peek_seq; |
| 1627 | } |
| 1628 | |
| 1629 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 1630 | |
| 1631 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | u32 offset; |
| 1633 | |
| 1634 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ |
| 1635 | if (tp->urg_data && tp->urg_seq == *seq) { |
| 1636 | if (copied) |
| 1637 | break; |
| 1638 | if (signal_pending(current)) { |
| 1639 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
| 1640 | break; |
| 1641 | } |
| 1642 | } |
| 1643 | |
| 1644 | /* Next get a buffer. */ |
| 1645 | |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 1646 | last = skb_peek_tail(&sk->sk_receive_queue); |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 1647 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 1648 | last = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | /* Now that we have two receive queues this |
| 1650 | * shouldn't happen. |
| 1651 | */ |
Ilpo Järvinen | d792c10 | 2009-11-13 13:56:33 -0800 | [diff] [blame] | 1652 | if (WARN(before(*seq, TCP_SKB_CB(skb)->seq), |
Joe Perches | 2af6fd8 | 2010-10-30 11:08:53 +0000 | [diff] [blame] | 1653 | "recvmsg bug: copied %X seq %X rcvnxt %X fl %X\n", |
| 1654 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, |
| 1655 | flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | break; |
Ilpo Järvinen | d792c10 | 2009-11-13 13:56:33 -0800 | [diff] [blame] | 1657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | offset = *seq - TCP_SKB_CB(skb)->seq; |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1659 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_SYN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | offset--; |
| 1661 | if (offset < skb->len) |
| 1662 | goto found_ok_skb; |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1663 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | goto found_fin_ok; |
Joe Perches | 2af6fd8 | 2010-10-30 11:08:53 +0000 | [diff] [blame] | 1665 | WARN(!(flags & MSG_PEEK), |
| 1666 | "recvmsg bug 2: copied %X seq %X rcvnxt %X fl %X\n", |
| 1667 | *seq, TCP_SKB_CB(skb)->seq, tp->rcv_nxt, flags); |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 1668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
| 1670 | /* Well, if we have backlog, try to process it now yet. */ |
| 1671 | |
| 1672 | if (copied >= target && !sk->sk_backlog.tail) |
| 1673 | break; |
| 1674 | |
| 1675 | if (copied) { |
| 1676 | if (sk->sk_err || |
| 1677 | sk->sk_state == TCP_CLOSE || |
| 1678 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 1679 | !timeo || |
David S. Miller | 518a09e | 2008-11-05 03:36:01 -0800 | [diff] [blame] | 1680 | signal_pending(current)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | break; |
| 1682 | } else { |
| 1683 | if (sock_flag(sk, SOCK_DONE)) |
| 1684 | break; |
| 1685 | |
| 1686 | if (sk->sk_err) { |
| 1687 | copied = sock_error(sk); |
| 1688 | break; |
| 1689 | } |
| 1690 | |
| 1691 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 1692 | break; |
| 1693 | |
| 1694 | if (sk->sk_state == TCP_CLOSE) { |
| 1695 | if (!sock_flag(sk, SOCK_DONE)) { |
| 1696 | /* This occurs when user tries to read |
| 1697 | * from never connected socket. |
| 1698 | */ |
| 1699 | copied = -ENOTCONN; |
| 1700 | break; |
| 1701 | } |
| 1702 | break; |
| 1703 | } |
| 1704 | |
| 1705 | if (!timeo) { |
| 1706 | copied = -EAGAIN; |
| 1707 | break; |
| 1708 | } |
| 1709 | |
| 1710 | if (signal_pending(current)) { |
| 1711 | copied = sock_intr_errno(timeo); |
| 1712 | break; |
| 1713 | } |
| 1714 | } |
| 1715 | |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1716 | tcp_cleanup_rbuf(sk, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | |
David S. Miller | 7df5512 | 2005-06-18 23:01:10 -0700 | [diff] [blame] | 1718 | if (!sysctl_tcp_low_latency && tp->ucopy.task == user_recv) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | /* Install new reader */ |
| 1720 | if (!user_recv && !(flags & (MSG_TRUNC | MSG_PEEK))) { |
| 1721 | user_recv = current; |
| 1722 | tp->ucopy.task = user_recv; |
Al Viro | f4362a2 | 2014-11-24 13:26:06 -0500 | [diff] [blame] | 1723 | tp->ucopy.msg = msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | } |
| 1725 | |
| 1726 | tp->ucopy.len = len; |
| 1727 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1728 | WARN_ON(tp->copied_seq != tp->rcv_nxt && |
| 1729 | !(flags & (MSG_PEEK | MSG_TRUNC))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | |
| 1731 | /* Ugly... If prequeue is not empty, we have to |
| 1732 | * process it before releasing socket, otherwise |
| 1733 | * order will be broken at second iteration. |
| 1734 | * More elegant solution is required!!! |
| 1735 | * |
| 1736 | * Look: we have the following (pseudo)queues: |
| 1737 | * |
| 1738 | * 1. packets in flight |
| 1739 | * 2. backlog |
| 1740 | * 3. prequeue |
| 1741 | * 4. receive_queue |
| 1742 | * |
| 1743 | * Each queue can be processed only if the next ones |
| 1744 | * are empty. At this point we have empty receive_queue. |
| 1745 | * But prequeue _can_ be not empty after 2nd iteration, |
| 1746 | * when we jumped to start of loop because backlog |
| 1747 | * processing added something to receive_queue. |
| 1748 | * We cannot release_sock(), because backlog contains |
| 1749 | * packets arrived _after_ prequeued ones. |
| 1750 | * |
| 1751 | * Shortly, algorithm is clear --- to process all |
| 1752 | * the queues in order. We could make it more directly, |
| 1753 | * requeueing packets from backlog to prequeue, if |
| 1754 | * is not empty. It is more elegant, but eats cycles, |
| 1755 | * unfortunately. |
| 1756 | */ |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1757 | if (!skb_queue_empty(&tp->ucopy.prequeue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | goto do_prequeue; |
| 1759 | |
| 1760 | /* __ Set realtime policy in scheduler __ */ |
| 1761 | } |
| 1762 | |
| 1763 | if (copied >= target) { |
| 1764 | /* Do not sleep, just process backlog. */ |
| 1765 | release_sock(sk); |
| 1766 | lock_sock(sk); |
Sabrina Dubroca | dfbafc9 | 2015-07-24 18:19:25 +0200 | [diff] [blame] | 1767 | } else { |
| 1768 | sk_wait_data(sk, &timeo, last); |
| 1769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | |
| 1771 | if (user_recv) { |
| 1772 | int chunk; |
| 1773 | |
| 1774 | /* __ Restore normal policy in scheduler __ */ |
| 1775 | |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 1776 | chunk = len - tp->ucopy.len; |
| 1777 | if (chunk != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1778 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | len -= chunk; |
| 1780 | copied += chunk; |
| 1781 | } |
| 1782 | |
| 1783 | if (tp->rcv_nxt == tp->copied_seq && |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1784 | !skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | do_prequeue: |
| 1786 | tcp_prequeue_process(sk); |
| 1787 | |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 1788 | chunk = len - tp->ucopy.len; |
| 1789 | if (chunk != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1790 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | len -= chunk; |
| 1792 | copied += chunk; |
| 1793 | } |
| 1794 | } |
| 1795 | } |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1796 | if ((flags & MSG_PEEK) && |
| 1797 | (peek_seq - copied - urg_hole != tp->copied_seq)) { |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 1798 | net_dbg_ratelimited("TCP(%s:%d): Application bug, race in MSG_PEEK\n", |
| 1799 | current->comm, |
| 1800 | task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | peek_seq = tp->copied_seq; |
| 1802 | } |
| 1803 | continue; |
| 1804 | |
| 1805 | found_ok_skb: |
| 1806 | /* Ok so how much can we use? */ |
| 1807 | used = skb->len - offset; |
| 1808 | if (len < used) |
| 1809 | used = len; |
| 1810 | |
| 1811 | /* Do we have urgent data here? */ |
| 1812 | if (tp->urg_data) { |
| 1813 | u32 urg_offset = tp->urg_seq - *seq; |
| 1814 | if (urg_offset < used) { |
| 1815 | if (!urg_offset) { |
| 1816 | if (!sock_flag(sk, SOCK_URGINLINE)) { |
| 1817 | ++*seq; |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1818 | urg_hole++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | offset++; |
| 1820 | used--; |
| 1821 | if (!used) |
| 1822 | goto skip_copy; |
| 1823 | } |
| 1824 | } else |
| 1825 | used = urg_offset; |
| 1826 | } |
| 1827 | } |
| 1828 | |
| 1829 | if (!(flags & MSG_TRUNC)) { |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 1830 | err = skb_copy_datagram_msg(skb, offset, msg, used); |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1831 | if (err) { |
| 1832 | /* Exception. Bailout! */ |
| 1833 | if (!copied) |
| 1834 | copied = -EFAULT; |
| 1835 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | } |
| 1837 | } |
| 1838 | |
| 1839 | *seq += used; |
| 1840 | copied += used; |
| 1841 | len -= used; |
| 1842 | |
| 1843 | tcp_rcv_space_adjust(sk); |
| 1844 | |
| 1845 | skip_copy: |
| 1846 | if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) { |
| 1847 | tp->urg_data = 0; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 1848 | tcp_fast_path_check(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | } |
| 1850 | if (used + offset < skb->len) |
| 1851 | continue; |
| 1852 | |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 1853 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1854 | goto found_fin_ok; |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1855 | if (!(flags & MSG_PEEK)) |
| 1856 | sk_eat_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | continue; |
| 1858 | |
| 1859 | found_fin_ok: |
| 1860 | /* Process the FIN. */ |
| 1861 | ++*seq; |
Dan Williams | 7bced39 | 2013-12-30 12:37:29 -0800 | [diff] [blame] | 1862 | if (!(flags & MSG_PEEK)) |
| 1863 | sk_eat_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | break; |
| 1865 | } while (len > 0); |
| 1866 | |
| 1867 | if (user_recv) { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1868 | if (!skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | int chunk; |
| 1870 | |
| 1871 | tp->ucopy.len = copied > 0 ? len : 0; |
| 1872 | |
| 1873 | tcp_prequeue_process(sk); |
| 1874 | |
| 1875 | if (copied > 0 && (chunk = len - tp->ucopy.len) != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1876 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | len -= chunk; |
| 1878 | copied += chunk; |
| 1879 | } |
| 1880 | } |
| 1881 | |
| 1882 | tp->ucopy.task = NULL; |
| 1883 | tp->ucopy.len = 0; |
| 1884 | } |
| 1885 | |
| 1886 | /* According to UNIX98, msg_name/msg_namelen are ignored |
| 1887 | * on connected socket. I was just happy when found this 8) --ANK |
| 1888 | */ |
| 1889 | |
| 1890 | /* Clean up data we have read: This will do ACK frames. */ |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1891 | tcp_cleanup_rbuf(sk, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | release_sock(sk); |
| 1894 | return copied; |
| 1895 | |
| 1896 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | release_sock(sk); |
| 1898 | return err; |
| 1899 | |
| 1900 | recv_urg: |
Rami Rosen | 377f0a0 | 2009-03-31 14:43:17 -0700 | [diff] [blame] | 1901 | err = tcp_recv_urg(sk, msg, len, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | goto out; |
Pavel Emelyanov | c0e88ff | 2012-04-19 03:41:01 +0000 | [diff] [blame] | 1903 | |
| 1904 | recv_sndq: |
| 1905 | err = tcp_peek_sndq(sk, msg, len); |
| 1906 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 1908 | EXPORT_SYMBOL(tcp_recvmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1910 | void tcp_set_state(struct sock *sk, int state) |
| 1911 | { |
| 1912 | int oldstate = sk->sk_state; |
| 1913 | |
| 1914 | switch (state) { |
| 1915 | case TCP_ESTABLISHED: |
| 1916 | if (oldstate != TCP_ESTABLISHED) |
Pavel Emelyanov | 81cc8a7 | 2008-07-16 20:22:04 -0700 | [diff] [blame] | 1917 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1918 | break; |
| 1919 | |
| 1920 | case TCP_CLOSE: |
| 1921 | if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) |
Pavel Emelyanov | 81cc8a7 | 2008-07-16 20:22:04 -0700 | [diff] [blame] | 1922 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ESTABRESETS); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1923 | |
| 1924 | sk->sk_prot->unhash(sk); |
| 1925 | if (inet_csk(sk)->icsk_bind_hash && |
| 1926 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1927 | inet_put_port(sk); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1928 | /* fall through */ |
| 1929 | default: |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 1930 | if (oldstate == TCP_ESTABLISHED) |
Pavel Emelyanov | 74688e4 | 2008-07-16 20:22:46 -0700 | [diff] [blame] | 1931 | TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1932 | } |
| 1933 | |
| 1934 | /* Change state AFTER socket is unhashed to avoid closed |
| 1935 | * socket sitting in hash tables. |
| 1936 | */ |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 1937 | sk_state_store(sk, state); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1938 | |
| 1939 | #ifdef STATE_TRACE |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 1940 | SOCK_DEBUG(sk, "TCP sk=%p, State %s -> %s\n", sk, statename[oldstate], statename[state]); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1941 | #endif |
| 1942 | } |
| 1943 | EXPORT_SYMBOL_GPL(tcp_set_state); |
| 1944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | /* |
| 1946 | * State processing on a close. This implements the state shift for |
| 1947 | * sending our FIN frame. Note that we only send a FIN for some |
| 1948 | * states. A shutdown() may have already sent the FIN, or we may be |
| 1949 | * closed. |
| 1950 | */ |
| 1951 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1952 | static const unsigned char new_state[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | /* current state: new state: action: */ |
Eric Dumazet | 0980c1e | 2015-03-24 15:58:53 -0700 | [diff] [blame] | 1954 | [0 /* (Invalid) */] = TCP_CLOSE, |
| 1955 | [TCP_ESTABLISHED] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1956 | [TCP_SYN_SENT] = TCP_CLOSE, |
| 1957 | [TCP_SYN_RECV] = TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1958 | [TCP_FIN_WAIT1] = TCP_FIN_WAIT1, |
| 1959 | [TCP_FIN_WAIT2] = TCP_FIN_WAIT2, |
| 1960 | [TCP_TIME_WAIT] = TCP_CLOSE, |
| 1961 | [TCP_CLOSE] = TCP_CLOSE, |
| 1962 | [TCP_CLOSE_WAIT] = TCP_LAST_ACK | TCP_ACTION_FIN, |
| 1963 | [TCP_LAST_ACK] = TCP_LAST_ACK, |
| 1964 | [TCP_LISTEN] = TCP_CLOSE, |
| 1965 | [TCP_CLOSING] = TCP_CLOSING, |
| 1966 | [TCP_NEW_SYN_RECV] = TCP_CLOSE, /* should not happen ! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | }; |
| 1968 | |
| 1969 | static int tcp_close_state(struct sock *sk) |
| 1970 | { |
| 1971 | int next = (int)new_state[sk->sk_state]; |
| 1972 | int ns = next & TCP_STATE_MASK; |
| 1973 | |
| 1974 | tcp_set_state(sk, ns); |
| 1975 | |
| 1976 | return next & TCP_ACTION_FIN; |
| 1977 | } |
| 1978 | |
| 1979 | /* |
| 1980 | * Shutdown the sending side of a connection. Much like close except |
Satoru SATOH | 1f29b05 | 2008-04-21 02:27:58 -0700 | [diff] [blame] | 1981 | * that we don't receive shut down or sock_set_flag(sk, SOCK_DEAD). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | */ |
| 1983 | |
| 1984 | void tcp_shutdown(struct sock *sk, int how) |
| 1985 | { |
| 1986 | /* We need to grab some memory, and put together a FIN, |
| 1987 | * and then put it into the queue to be sent. |
| 1988 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. |
| 1989 | */ |
| 1990 | if (!(how & SEND_SHUTDOWN)) |
| 1991 | return; |
| 1992 | |
| 1993 | /* If we've already sent a FIN, or it's a closed state, skip this. */ |
| 1994 | if ((1 << sk->sk_state) & |
| 1995 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | |
| 1996 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { |
| 1997 | /* Clear out any half completed packets. FIN if needed. */ |
| 1998 | if (tcp_close_state(sk)) |
| 1999 | tcp_send_fin(sk); |
| 2000 | } |
| 2001 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2002 | EXPORT_SYMBOL(tcp_shutdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | |
Arun Sharma | efcdbf2 | 2012-01-30 14:16:06 -0800 | [diff] [blame] | 2004 | bool tcp_check_oom(struct sock *sk, int shift) |
| 2005 | { |
| 2006 | bool too_many_orphans, out_of_socket_memory; |
| 2007 | |
| 2008 | too_many_orphans = tcp_too_many_orphans(sk, shift); |
| 2009 | out_of_socket_memory = tcp_out_of_memory(sk); |
| 2010 | |
Joe Perches | e87cc47 | 2012-05-13 21:56:26 +0000 | [diff] [blame] | 2011 | if (too_many_orphans) |
| 2012 | net_info_ratelimited("too many orphaned sockets\n"); |
| 2013 | if (out_of_socket_memory) |
| 2014 | net_info_ratelimited("out of memory -- consider tuning tcp_mem\n"); |
Arun Sharma | efcdbf2 | 2012-01-30 14:16:06 -0800 | [diff] [blame] | 2015 | return too_many_orphans || out_of_socket_memory; |
| 2016 | } |
| 2017 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | void tcp_close(struct sock *sk, long timeout) |
| 2019 | { |
| 2020 | struct sk_buff *skb; |
| 2021 | int data_was_unread = 0; |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 2022 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | |
| 2024 | lock_sock(sk); |
| 2025 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 2026 | |
| 2027 | if (sk->sk_state == TCP_LISTEN) { |
| 2028 | tcp_set_state(sk, TCP_CLOSE); |
| 2029 | |
| 2030 | /* Special case. */ |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2031 | inet_csk_listen_stop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | |
| 2033 | goto adjudge_to_death; |
| 2034 | } |
| 2035 | |
| 2036 | /* We need to flush the recv. buffs. We do this only on the |
| 2037 | * descriptor close, not protocol-sourced closes, because the |
| 2038 | * reader process may not have drained the data yet! |
| 2039 | */ |
| 2040 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Eric Dumazet | e11ecdd | 2014-09-15 04:19:51 -0700 | [diff] [blame] | 2041 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq; |
| 2042 | |
| 2043 | if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) |
| 2044 | len--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | data_was_unread += len; |
| 2046 | __kfree_skb(skb); |
| 2047 | } |
| 2048 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2049 | sk_mem_reclaim(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
Konstantin Khorenko | 565b7b2 | 2010-06-24 21:54:58 -0700 | [diff] [blame] | 2051 | /* If socket has been already reset (e.g. in tcp_reset()) - kill it. */ |
| 2052 | if (sk->sk_state == TCP_CLOSE) |
| 2053 | goto adjudge_to_death; |
| 2054 | |
Gerrit Renker | 65bb723 | 2007-04-28 21:21:46 -0700 | [diff] [blame] | 2055 | /* As outlined in RFC 2525, section 2.17, we send a RST here because |
| 2056 | * data was lost. To witness the awful effects of the old behavior of |
| 2057 | * always doing a FIN, run an older 2.1.x kernel or 2.0.x, start a bulk |
| 2058 | * GET in an FTP client, suspend the process, wait for the client to |
| 2059 | * advertise a zero window, then kill -9 the FTP client, wheee... |
| 2060 | * Note: timeout is always zero in such a case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | */ |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2062 | if (unlikely(tcp_sk(sk)->repair)) { |
| 2063 | sk->sk_prot->disconnect(sk, 0); |
| 2064 | } else if (data_was_unread) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | /* Unread data was tossed, zap the connection. */ |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 2066 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | tcp_set_state(sk, TCP_CLOSE); |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 2068 | tcp_send_active_reset(sk, sk->sk_allocation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
| 2070 | /* Check zero linger _after_ checking for unread data. */ |
| 2071 | sk->sk_prot->disconnect(sk, 0); |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 2072 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONDATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | } else if (tcp_close_state(sk)) { |
| 2074 | /* We FIN if the application ate all the data before |
| 2075 | * zapping the connection. |
| 2076 | */ |
| 2077 | |
| 2078 | /* RED-PEN. Formally speaking, we have broken TCP state |
| 2079 | * machine. State transitions: |
| 2080 | * |
| 2081 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 |
| 2082 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) |
| 2083 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK |
| 2084 | * |
| 2085 | * are legal only when FIN has been sent (i.e. in window), |
| 2086 | * rather than queued out of window. Purists blame. |
| 2087 | * |
| 2088 | * F.e. "RFC state" is ESTABLISHED, |
| 2089 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. |
| 2090 | * |
| 2091 | * The visible declinations are that sometimes |
| 2092 | * we enter time-wait state, when it is not required really |
| 2093 | * (harmless), do not send active resets, when they are |
| 2094 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when |
| 2095 | * they look as CLOSING or LAST_ACK for Linux) |
| 2096 | * Probably, I missed some more holelets. |
| 2097 | * --ANK |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2098 | * XXX (TFO) - To start off we don't support SYN+ACK+FIN |
| 2099 | * in a single packet! (May consider it later but will |
| 2100 | * probably need API support or TCP_CORK SYN-ACK until |
| 2101 | * data is written and socket is closed.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | */ |
| 2103 | tcp_send_fin(sk); |
| 2104 | } |
| 2105 | |
| 2106 | sk_stream_wait_close(sk, timeout); |
| 2107 | |
| 2108 | adjudge_to_death: |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 2109 | state = sk->sk_state; |
| 2110 | sock_hold(sk); |
| 2111 | sock_orphan(sk); |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 2112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | /* It is the last release_sock in its life. It will remove backlog. */ |
| 2114 | release_sock(sk); |
| 2115 | |
| 2116 | |
| 2117 | /* Now socket is owned by kernel and we acquire BH lock |
| 2118 | to finish close. No need to check for user refs. |
| 2119 | */ |
| 2120 | local_bh_disable(); |
| 2121 | bh_lock_sock(sk); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 2122 | WARN_ON(sock_owned_by_user(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 2124 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 2125 | |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 2126 | /* Have we already been destroyed by a softirq or backlog? */ |
| 2127 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) |
| 2128 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | |
| 2130 | /* This is a (useful) BSD violating of the RFC. There is a |
| 2131 | * problem with TCP as specified in that the other end could |
| 2132 | * keep a socket open forever with no application left this end. |
Jesper Juhl | b10bd54 | 2014-02-09 23:30:32 +0100 | [diff] [blame] | 2133 | * We use a 1 minute timeout (about the same as BSD) then kill |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | * our end. If they send after that then tough - BUT: long enough |
| 2135 | * that we won't make the old 4*rto = almost no time - whoops |
| 2136 | * reset mistake. |
| 2137 | * |
| 2138 | * Nope, it was not mistake. It is really desired behaviour |
| 2139 | * f.e. on http servers, when such sockets are useless, but |
| 2140 | * consume significant resources. Let's do it with special |
| 2141 | * linger2 option. --ANK |
| 2142 | */ |
| 2143 | |
| 2144 | if (sk->sk_state == TCP_FIN_WAIT2) { |
| 2145 | struct tcp_sock *tp = tcp_sk(sk); |
| 2146 | if (tp->linger2 < 0) { |
| 2147 | tcp_set_state(sk, TCP_CLOSE); |
| 2148 | tcp_send_active_reset(sk, GFP_ATOMIC); |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 2149 | NET_INC_STATS_BH(sock_net(sk), |
| 2150 | LINUX_MIB_TCPABORTONLINGER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2152 | const int tmo = tcp_fin_time(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | |
| 2154 | if (tmo > TCP_TIMEWAIT_LEN) { |
David S. Miller | 52499af | 2006-07-31 22:32:09 -0700 | [diff] [blame] | 2155 | inet_csk_reset_keepalive_timer(sk, |
| 2156 | tmo - TCP_TIMEWAIT_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
| 2159 | goto out; |
| 2160 | } |
| 2161 | } |
| 2162 | } |
| 2163 | if (sk->sk_state != TCP_CLOSE) { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2164 | sk_mem_reclaim(sk); |
Arun Sharma | efcdbf2 | 2012-01-30 14:16:06 -0800 | [diff] [blame] | 2165 | if (tcp_check_oom(sk, 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | tcp_set_state(sk, TCP_CLOSE); |
| 2167 | tcp_send_active_reset(sk, GFP_ATOMIC); |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 2168 | NET_INC_STATS_BH(sock_net(sk), |
| 2169 | LINUX_MIB_TCPABORTONMEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | } |
| 2171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2173 | if (sk->sk_state == TCP_CLOSE) { |
| 2174 | struct request_sock *req = tcp_sk(sk)->fastopen_rsk; |
| 2175 | /* We could get here with a non-NULL req if the socket is |
| 2176 | * aborted (e.g., closed with unread data) before 3WHS |
| 2177 | * finishes. |
| 2178 | */ |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 2179 | if (req) |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2180 | reqsk_fastopen_remove(sk, req, false); |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2181 | inet_csk_destroy_sock(sk); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | /* Otherwise, socket is reprieved until protocol close. */ |
| 2184 | |
| 2185 | out: |
| 2186 | bh_unlock_sock(sk); |
| 2187 | local_bh_enable(); |
| 2188 | sock_put(sk); |
| 2189 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2190 | EXPORT_SYMBOL(tcp_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | |
| 2192 | /* These states need RST on ABORT according to RFC793 */ |
| 2193 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 2194 | static inline bool tcp_need_reset(int state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | { |
| 2196 | return (1 << state) & |
| 2197 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | |
| 2198 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); |
| 2199 | } |
| 2200 | |
| 2201 | int tcp_disconnect(struct sock *sk, int flags) |
| 2202 | { |
| 2203 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2204 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | struct tcp_sock *tp = tcp_sk(sk); |
| 2206 | int err = 0; |
| 2207 | int old_state = sk->sk_state; |
| 2208 | |
| 2209 | if (old_state != TCP_CLOSE) |
| 2210 | tcp_set_state(sk, TCP_CLOSE); |
| 2211 | |
| 2212 | /* ABORT function of RFC793 */ |
| 2213 | if (old_state == TCP_LISTEN) { |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2214 | inet_csk_listen_stop(sk); |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2215 | } else if (unlikely(tp->repair)) { |
| 2216 | sk->sk_err = ECONNABORTED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | } else if (tcp_need_reset(old_state) || |
| 2218 | (tp->snd_nxt != tp->write_seq && |
| 2219 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 2220 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | * states |
| 2222 | */ |
| 2223 | tcp_send_active_reset(sk, gfp_any()); |
| 2224 | sk->sk_err = ECONNRESET; |
| 2225 | } else if (old_state == TCP_SYN_SENT) |
| 2226 | sk->sk_err = ECONNRESET; |
| 2227 | |
| 2228 | tcp_clear_xmit_timers(sk); |
| 2229 | __skb_queue_purge(&sk->sk_receive_queue); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2230 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | __skb_queue_purge(&tp->out_of_order_queue); |
| 2232 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2233 | inet->inet_dport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2234 | |
| 2235 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 2236 | inet_reset_saddr(sk); |
| 2237 | |
| 2238 | sk->sk_shutdown = 0; |
| 2239 | sock_reset_flag(sk, SOCK_DONE); |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 2240 | tp->srtt_us = 0; |
Yuvaraja Mariappan | 686a562 | 2015-10-06 10:53:29 -0700 | [diff] [blame] | 2241 | tp->write_seq += tp->max_window + 2; |
| 2242 | if (tp->write_seq == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | tp->write_seq = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2244 | icsk->icsk_backoff = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | tp->snd_cwnd = 2; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2246 | icsk->icsk_probes_out = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | tp->packets_out = 0; |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 2248 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | tp->snd_cwnd_cnt = 0; |
Eric Dumazet | 1fdf475 | 2009-11-30 12:53:30 -0800 | [diff] [blame] | 2250 | tp->window_clamp = 0; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2251 | tcp_set_ca_state(sk, TCP_CA_Open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | tcp_clear_retrans(tp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2253 | inet_csk_delack_init(sk); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2254 | tcp_init_send_head(sk); |
Srinivas Aji | b40b4f7 | 2007-05-03 17:32:28 -0700 | [diff] [blame] | 2255 | memset(&tp->rx_opt, 0, sizeof(tp->rx_opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | __sk_dst_reset(sk); |
| 2257 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2258 | WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | |
| 2260 | sk->sk_error_report(sk); |
| 2261 | return err; |
| 2262 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2263 | EXPORT_SYMBOL(tcp_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | |
Eric Dumazet | a2a385d | 2012-05-16 23:15:34 +0000 | [diff] [blame] | 2265 | static inline bool tcp_can_repair_sock(const struct sock *sk) |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2266 | { |
Eric W. Biederman | 52e804c | 2012-11-16 03:03:05 +0000 | [diff] [blame] | 2267 | return ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) && |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2268 | ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_ESTABLISHED)); |
| 2269 | } |
| 2270 | |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2271 | static int tcp_repair_options_est(struct tcp_sock *tp, |
| 2272 | struct tcp_repair_opt __user *optbuf, unsigned int len) |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2273 | { |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2274 | struct tcp_repair_opt opt; |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2275 | |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2276 | while (len >= sizeof(opt)) { |
| 2277 | if (copy_from_user(&opt, optbuf, sizeof(opt))) |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2278 | return -EFAULT; |
| 2279 | |
| 2280 | optbuf++; |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2281 | len -= sizeof(opt); |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2282 | |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2283 | switch (opt.opt_code) { |
| 2284 | case TCPOPT_MSS: |
| 2285 | tp->rx_opt.mss_clamp = opt.opt_val; |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2286 | break; |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2287 | case TCPOPT_WINDOW: |
Andrey Vagin | bc26ccd | 2012-09-19 09:40:00 +0000 | [diff] [blame] | 2288 | { |
| 2289 | u16 snd_wscale = opt.opt_val & 0xFFFF; |
| 2290 | u16 rcv_wscale = opt.opt_val >> 16; |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2291 | |
Andrey Vagin | bc26ccd | 2012-09-19 09:40:00 +0000 | [diff] [blame] | 2292 | if (snd_wscale > 14 || rcv_wscale > 14) |
| 2293 | return -EFBIG; |
| 2294 | |
| 2295 | tp->rx_opt.snd_wscale = snd_wscale; |
| 2296 | tp->rx_opt.rcv_wscale = rcv_wscale; |
| 2297 | tp->rx_opt.wscale_ok = 1; |
| 2298 | } |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2299 | break; |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2300 | case TCPOPT_SACK_PERM: |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2301 | if (opt.opt_val != 0) |
| 2302 | return -EINVAL; |
| 2303 | |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2304 | tp->rx_opt.sack_ok |= TCP_SACK_SEEN; |
| 2305 | if (sysctl_tcp_fack) |
| 2306 | tcp_enable_fack(tp); |
| 2307 | break; |
| 2308 | case TCPOPT_TIMESTAMP: |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2309 | if (opt.opt_val != 0) |
| 2310 | return -EINVAL; |
| 2311 | |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2312 | tp->rx_opt.tstamp_ok = 1; |
| 2313 | break; |
| 2314 | } |
| 2315 | } |
| 2316 | |
| 2317 | return 0; |
| 2318 | } |
| 2319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | * Socket option code for TCP. |
| 2322 | */ |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2323 | static int do_tcp_setsockopt(struct sock *sk, int level, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2324 | int optname, char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2325 | { |
| 2326 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2327 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | int val; |
| 2329 | int err = 0; |
| 2330 | |
William Allen Simpson | e56fb50 | 2009-12-02 18:19:30 +0000 | [diff] [blame] | 2331 | /* These are data/string values, all the others are ints */ |
| 2332 | switch (optname) { |
| 2333 | case TCP_CONGESTION: { |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2334 | char name[TCP_CA_NAME_MAX]; |
| 2335 | |
| 2336 | if (optlen < 1) |
| 2337 | return -EINVAL; |
| 2338 | |
| 2339 | val = strncpy_from_user(name, optval, |
Andrew Morton | 4fdb78d | 2009-10-01 15:02:20 -0700 | [diff] [blame] | 2340 | min_t(long, TCP_CA_NAME_MAX-1, optlen)); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2341 | if (val < 0) |
| 2342 | return -EFAULT; |
| 2343 | name[val] = 0; |
| 2344 | |
| 2345 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2346 | err = tcp_set_congestion_control(sk, name); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2347 | release_sock(sk); |
| 2348 | return err; |
| 2349 | } |
William Allen Simpson | e56fb50 | 2009-12-02 18:19:30 +0000 | [diff] [blame] | 2350 | default: |
| 2351 | /* fallthru */ |
| 2352 | break; |
Joe Perches | ccbd6a5 | 2010-05-14 10:58:26 +0000 | [diff] [blame] | 2353 | } |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | if (optlen < sizeof(int)) |
| 2356 | return -EINVAL; |
| 2357 | |
| 2358 | if (get_user(val, (int __user *)optval)) |
| 2359 | return -EFAULT; |
| 2360 | |
| 2361 | lock_sock(sk); |
| 2362 | |
| 2363 | switch (optname) { |
| 2364 | case TCP_MAXSEG: |
| 2365 | /* Values greater than interface MTU won't take effect. However |
| 2366 | * at the point when this call is done we typically don't yet |
| 2367 | * know which interface is going to be used */ |
David S. Miller | c39508d | 2010-11-24 11:47:22 -0800 | [diff] [blame] | 2368 | if (val < TCP_MIN_MSS || val > MAX_TCP_WINDOW) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | err = -EINVAL; |
| 2370 | break; |
| 2371 | } |
| 2372 | tp->rx_opt.user_mss = val; |
| 2373 | break; |
| 2374 | |
| 2375 | case TCP_NODELAY: |
| 2376 | if (val) { |
| 2377 | /* TCP_NODELAY is weaker than TCP_CORK, so that |
| 2378 | * this option on corked socket is remembered, but |
| 2379 | * it is not activated until cork is cleared. |
| 2380 | * |
| 2381 | * However, when TCP_NODELAY is set we make |
| 2382 | * an explicit push, which overrides even TCP_CORK |
| 2383 | * for currently queued segments. |
| 2384 | */ |
| 2385 | tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 2386 | tcp_push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | } else { |
| 2388 | tp->nonagle &= ~TCP_NAGLE_OFF; |
| 2389 | } |
| 2390 | break; |
| 2391 | |
Andreas Petlund | 36e31b0a | 2010-02-18 02:47:01 +0000 | [diff] [blame] | 2392 | case TCP_THIN_LINEAR_TIMEOUTS: |
| 2393 | if (val < 0 || val > 1) |
| 2394 | err = -EINVAL; |
| 2395 | else |
| 2396 | tp->thin_lto = val; |
| 2397 | break; |
| 2398 | |
Andreas Petlund | 7e38017 | 2010-02-18 04:48:19 +0000 | [diff] [blame] | 2399 | case TCP_THIN_DUPACK: |
| 2400 | if (val < 0 || val > 1) |
| 2401 | err = -EINVAL; |
Dave Jones | e2e5c4c | 2013-09-05 13:43:34 -0400 | [diff] [blame] | 2402 | else { |
Andreas Petlund | 7e38017 | 2010-02-18 04:48:19 +0000 | [diff] [blame] | 2403 | tp->thin_dupack = val; |
Yuchung Cheng | eed530b | 2012-05-02 13:30:03 +0000 | [diff] [blame] | 2404 | if (tp->thin_dupack) |
| 2405 | tcp_disable_early_retrans(tp); |
Dave Jones | e2e5c4c | 2013-09-05 13:43:34 -0400 | [diff] [blame] | 2406 | } |
Andreas Petlund | 7e38017 | 2010-02-18 04:48:19 +0000 | [diff] [blame] | 2407 | break; |
| 2408 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2409 | case TCP_REPAIR: |
| 2410 | if (!tcp_can_repair_sock(sk)) |
| 2411 | err = -EPERM; |
| 2412 | else if (val == 1) { |
| 2413 | tp->repair = 1; |
| 2414 | sk->sk_reuse = SK_FORCE_REUSE; |
| 2415 | tp->repair_queue = TCP_NO_QUEUE; |
| 2416 | } else if (val == 0) { |
| 2417 | tp->repair = 0; |
| 2418 | sk->sk_reuse = SK_NO_REUSE; |
| 2419 | tcp_send_window_probe(sk); |
| 2420 | } else |
| 2421 | err = -EINVAL; |
| 2422 | |
| 2423 | break; |
| 2424 | |
| 2425 | case TCP_REPAIR_QUEUE: |
| 2426 | if (!tp->repair) |
| 2427 | err = -EPERM; |
| 2428 | else if (val < TCP_QUEUES_NR) |
| 2429 | tp->repair_queue = val; |
| 2430 | else |
| 2431 | err = -EINVAL; |
| 2432 | break; |
| 2433 | |
| 2434 | case TCP_QUEUE_SEQ: |
| 2435 | if (sk->sk_state != TCP_CLOSE) |
| 2436 | err = -EPERM; |
| 2437 | else if (tp->repair_queue == TCP_SEND_QUEUE) |
| 2438 | tp->write_seq = val; |
| 2439 | else if (tp->repair_queue == TCP_RECV_QUEUE) |
| 2440 | tp->rcv_nxt = val; |
| 2441 | else |
| 2442 | err = -EINVAL; |
| 2443 | break; |
| 2444 | |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2445 | case TCP_REPAIR_OPTIONS: |
| 2446 | if (!tp->repair) |
| 2447 | err = -EINVAL; |
| 2448 | else if (sk->sk_state == TCP_ESTABLISHED) |
Pavel Emelyanov | de248a7 | 2012-04-25 23:43:04 +0000 | [diff] [blame] | 2449 | err = tcp_repair_options_est(tp, |
| 2450 | (struct tcp_repair_opt __user *)optval, |
| 2451 | optlen); |
Pavel Emelyanov | b139ba4 | 2012-04-19 03:41:57 +0000 | [diff] [blame] | 2452 | else |
| 2453 | err = -EPERM; |
| 2454 | break; |
| 2455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | case TCP_CORK: |
| 2457 | /* When set indicates to always queue non-full frames. |
| 2458 | * Later the user clears this option and we transmit |
| 2459 | * any pending partial frames in the queue. This is |
| 2460 | * meant to be used alongside sendfile() to get properly |
| 2461 | * filled frames when the user (for example) must write |
| 2462 | * out headers with a write() call first and then use |
| 2463 | * sendfile to send out the data parts. |
| 2464 | * |
| 2465 | * TCP_CORK can be set together with TCP_NODELAY and it is |
| 2466 | * stronger than TCP_NODELAY. |
| 2467 | */ |
| 2468 | if (val) { |
| 2469 | tp->nonagle |= TCP_NAGLE_CORK; |
| 2470 | } else { |
| 2471 | tp->nonagle &= ~TCP_NAGLE_CORK; |
| 2472 | if (tp->nonagle&TCP_NAGLE_OFF) |
| 2473 | tp->nonagle |= TCP_NAGLE_PUSH; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 2474 | tcp_push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | } |
| 2476 | break; |
| 2477 | |
| 2478 | case TCP_KEEPIDLE: |
| 2479 | if (val < 1 || val > MAX_TCP_KEEPIDLE) |
| 2480 | err = -EINVAL; |
| 2481 | else { |
| 2482 | tp->keepalive_time = val * HZ; |
| 2483 | if (sock_flag(sk, SOCK_KEEPOPEN) && |
| 2484 | !((1 << sk->sk_state) & |
| 2485 | (TCPF_CLOSE | TCPF_LISTEN))) { |
Flavio Leitner | 6c37e5d | 2010-04-26 18:33:27 +0000 | [diff] [blame] | 2486 | u32 elapsed = keepalive_time_elapsed(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | if (tp->keepalive_time > elapsed) |
| 2488 | elapsed = tp->keepalive_time - elapsed; |
| 2489 | else |
| 2490 | elapsed = 0; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2491 | inet_csk_reset_keepalive_timer(sk, elapsed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2492 | } |
| 2493 | } |
| 2494 | break; |
| 2495 | case TCP_KEEPINTVL: |
| 2496 | if (val < 1 || val > MAX_TCP_KEEPINTVL) |
| 2497 | err = -EINVAL; |
| 2498 | else |
| 2499 | tp->keepalive_intvl = val * HZ; |
| 2500 | break; |
| 2501 | case TCP_KEEPCNT: |
| 2502 | if (val < 1 || val > MAX_TCP_KEEPCNT) |
| 2503 | err = -EINVAL; |
| 2504 | else |
| 2505 | tp->keepalive_probes = val; |
| 2506 | break; |
| 2507 | case TCP_SYNCNT: |
| 2508 | if (val < 1 || val > MAX_TCP_SYNCNT) |
| 2509 | err = -EINVAL; |
| 2510 | else |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2511 | icsk->icsk_syn_retries = val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2512 | break; |
| 2513 | |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 2514 | case TCP_SAVE_SYN: |
| 2515 | if (val < 0 || val > 1) |
| 2516 | err = -EINVAL; |
| 2517 | else |
| 2518 | tp->save_syn = val; |
| 2519 | break; |
| 2520 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | case TCP_LINGER2: |
| 2522 | if (val < 0) |
| 2523 | tp->linger2 = -1; |
| 2524 | else if (val > sysctl_tcp_fin_timeout / HZ) |
| 2525 | tp->linger2 = 0; |
| 2526 | else |
| 2527 | tp->linger2 = val * HZ; |
| 2528 | break; |
| 2529 | |
| 2530 | case TCP_DEFER_ACCEPT: |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 2531 | /* Translate value in seconds to number of retransmits */ |
| 2532 | icsk->icsk_accept_queue.rskq_defer_accept = |
| 2533 | secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ, |
| 2534 | TCP_RTO_MAX / HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2535 | break; |
| 2536 | |
| 2537 | case TCP_WINDOW_CLAMP: |
| 2538 | if (!val) { |
| 2539 | if (sk->sk_state != TCP_CLOSE) { |
| 2540 | err = -EINVAL; |
| 2541 | break; |
| 2542 | } |
| 2543 | tp->window_clamp = 0; |
| 2544 | } else |
| 2545 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? |
| 2546 | SOCK_MIN_RCVBUF / 2 : val; |
| 2547 | break; |
| 2548 | |
| 2549 | case TCP_QUICKACK: |
| 2550 | if (!val) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2551 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2553 | icsk->icsk_ack.pingpong = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2554 | if ((1 << sk->sk_state) & |
| 2555 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2556 | inet_csk_ack_scheduled(sk)) { |
| 2557 | icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 2558 | tcp_cleanup_rbuf(sk, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | if (!(val & 1)) |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2560 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2561 | } |
| 2562 | } |
| 2563 | break; |
| 2564 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2565 | #ifdef CONFIG_TCP_MD5SIG |
| 2566 | case TCP_MD5SIG: |
| 2567 | /* Read the IP->Key mappings from userspace */ |
| 2568 | err = tp->af_specific->md5_parse(sk, optval, optlen); |
| 2569 | break; |
| 2570 | #endif |
Jerry Chu | dca43c7 | 2010-08-27 19:13:28 +0000 | [diff] [blame] | 2571 | case TCP_USER_TIMEOUT: |
Yuchung Cheng | b248230 | 2014-09-29 13:20:38 -0700 | [diff] [blame] | 2572 | /* Cap the max time in ms TCP will retry or probe the window |
Jerry Chu | dca43c7 | 2010-08-27 19:13:28 +0000 | [diff] [blame] | 2573 | * before giving up and aborting (ETIMEDOUT) a connection. |
| 2574 | */ |
Hangbin Liu | 4249357 | 2012-07-26 22:52:21 +0000 | [diff] [blame] | 2575 | if (val < 0) |
| 2576 | err = -EINVAL; |
| 2577 | else |
| 2578 | icsk->icsk_user_timeout = msecs_to_jiffies(val); |
Jerry Chu | dca43c7 | 2010-08-27 19:13:28 +0000 | [diff] [blame] | 2579 | break; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2580 | |
| 2581 | case TCP_FASTOPEN: |
| 2582 | if (val >= 0 && ((1 << sk->sk_state) & (TCPF_CLOSE | |
Christoph Paasch | dfea2aa | 2015-06-18 09:15:34 -0700 | [diff] [blame] | 2583 | TCPF_LISTEN))) { |
| 2584 | tcp_fastopen_init_key_once(true); |
| 2585 | |
Eric Dumazet | 0536fcc | 2015-09-29 07:42:52 -0700 | [diff] [blame] | 2586 | fastopen_queue_tune(sk, val); |
Christoph Paasch | dfea2aa | 2015-06-18 09:15:34 -0700 | [diff] [blame] | 2587 | } else { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2588 | err = -EINVAL; |
Christoph Paasch | dfea2aa | 2015-06-18 09:15:34 -0700 | [diff] [blame] | 2589 | } |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 2590 | break; |
Andrey Vagin | 93be6ce | 2013-02-11 05:50:18 +0000 | [diff] [blame] | 2591 | case TCP_TIMESTAMP: |
| 2592 | if (!tp->repair) |
| 2593 | err = -EPERM; |
| 2594 | else |
| 2595 | tp->tsoffset = val - tcp_time_stamp; |
| 2596 | break; |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2597 | case TCP_NOTSENT_LOWAT: |
| 2598 | tp->notsent_lowat = val; |
| 2599 | sk->sk_write_space(sk); |
| 2600 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2601 | default: |
| 2602 | err = -ENOPROTOOPT; |
| 2603 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2604 | } |
| 2605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | release_sock(sk); |
| 2607 | return err; |
| 2608 | } |
| 2609 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2610 | int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2611 | unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2612 | { |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 2613 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2614 | |
| 2615 | if (level != SOL_TCP) |
| 2616 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, |
| 2617 | optval, optlen); |
| 2618 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 2619 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2620 | EXPORT_SYMBOL(tcp_setsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2621 | |
| 2622 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2623 | int compat_tcp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2624 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2625 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 2626 | if (level != SOL_TCP) |
| 2627 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 2628 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2629 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 2630 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2631 | EXPORT_SYMBOL(compat_tcp_setsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2632 | #endif |
| 2633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2634 | /* Return information about state of tcp endpoint in API format. */ |
Eric Dumazet | 0df48c2 | 2015-04-28 15:28:17 -0700 | [diff] [blame] | 2635 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2636 | { |
Craig Gallek | 35ac838 | 2015-06-15 11:26:20 -0400 | [diff] [blame] | 2637 | const struct tcp_sock *tp = tcp_sk(sk); /* iff sk_type == SOCK_STREAM */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2638 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | u32 now = tcp_time_stamp; |
Eric Dumazet | d654976 | 2015-05-21 21:51:19 -0700 | [diff] [blame] | 2640 | unsigned int start; |
Eric Dumazet | fad9dfe | 2015-04-16 16:12:28 -0700 | [diff] [blame] | 2641 | u32 rate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | |
| 2643 | memset(info, 0, sizeof(*info)); |
Craig Gallek | 35ac838 | 2015-06-15 11:26:20 -0400 | [diff] [blame] | 2644 | if (sk->sk_type != SOCK_STREAM) |
| 2645 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2646 | |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2647 | info->tcpi_state = sk_state_load(sk); |
| 2648 | |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2649 | info->tcpi_ca_state = icsk->icsk_ca_state; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2650 | info->tcpi_retransmits = icsk->icsk_retransmits; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2651 | info->tcpi_probes = icsk->icsk_probes_out; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2652 | info->tcpi_backoff = icsk->icsk_backoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2653 | |
| 2654 | if (tp->rx_opt.tstamp_ok) |
| 2655 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
Ilpo Järvinen | e60402d | 2007-08-09 15:14:46 +0300 | [diff] [blame] | 2656 | if (tcp_is_sack(tp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | info->tcpi_options |= TCPI_OPT_SACK; |
| 2658 | if (tp->rx_opt.wscale_ok) { |
| 2659 | info->tcpi_options |= TCPI_OPT_WSCALE; |
| 2660 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; |
| 2661 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2662 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | |
Eric Dumazet | b5c5693 | 2011-10-03 14:01:21 -0400 | [diff] [blame] | 2664 | if (tp->ecn_flags & TCP_ECN_OK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2665 | info->tcpi_options |= TCPI_OPT_ECN; |
Eric Dumazet | b5c5693 | 2011-10-03 14:01:21 -0400 | [diff] [blame] | 2666 | if (tp->ecn_flags & TCP_ECN_SEEN) |
| 2667 | info->tcpi_options |= TCPI_OPT_ECN_SEEN; |
Yuchung Cheng | 6f73601 | 2012-10-19 15:14:44 +0000 | [diff] [blame] | 2668 | if (tp->syn_data_acked) |
| 2669 | info->tcpi_options |= TCPI_OPT_SYN_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2671 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
| 2672 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 2673 | info->tcpi_snd_mss = tp->mss_cache; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2674 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | |
Eric Dumazet | 00fd38d | 2015-11-12 08:43:18 -0800 | [diff] [blame] | 2676 | if (info->tcpi_state == TCP_LISTEN) { |
Rick Jones | 5ee3afb | 2007-09-18 13:26:31 -0700 | [diff] [blame] | 2677 | info->tcpi_unacked = sk->sk_ack_backlog; |
| 2678 | info->tcpi_sacked = sk->sk_max_ack_backlog; |
| 2679 | } else { |
| 2680 | info->tcpi_unacked = tp->packets_out; |
| 2681 | info->tcpi_sacked = tp->sacked_out; |
| 2682 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2683 | info->tcpi_lost = tp->lost_out; |
| 2684 | info->tcpi_retrans = tp->retrans_out; |
| 2685 | info->tcpi_fackets = tp->fackets_out; |
| 2686 | |
| 2687 | info->tcpi_last_data_sent = jiffies_to_msecs(now - tp->lsndtime); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2688 | info->tcpi_last_data_recv = jiffies_to_msecs(now - icsk->icsk_ack.lrcvtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2689 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
| 2690 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 2691 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2692 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
Eric Dumazet | 740b0f1 | 2014-02-26 14:02:48 -0800 | [diff] [blame] | 2693 | info->tcpi_rtt = tp->srtt_us >> 3; |
| 2694 | info->tcpi_rttvar = tp->mdev_us >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
| 2696 | info->tcpi_snd_cwnd = tp->snd_cwnd; |
| 2697 | info->tcpi_advmss = tp->advmss; |
| 2698 | info->tcpi_reordering = tp->reordering; |
| 2699 | |
| 2700 | info->tcpi_rcv_rtt = jiffies_to_usecs(tp->rcv_rtt_est.rtt)>>3; |
| 2701 | info->tcpi_rcv_space = tp->rcvq_space.space; |
| 2702 | |
| 2703 | info->tcpi_total_retrans = tp->total_retrans; |
Eric Dumazet | 977cb0e | 2014-02-13 14:27:40 -0800 | [diff] [blame] | 2704 | |
Eric Dumazet | fad9dfe | 2015-04-16 16:12:28 -0700 | [diff] [blame] | 2705 | rate = READ_ONCE(sk->sk_pacing_rate); |
| 2706 | info->tcpi_pacing_rate = rate != ~0U ? rate : ~0ULL; |
| 2707 | |
| 2708 | rate = READ_ONCE(sk->sk_max_pacing_rate); |
| 2709 | info->tcpi_max_pacing_rate = rate != ~0U ? rate : ~0ULL; |
Eric Dumazet | 0df48c2 | 2015-04-28 15:28:17 -0700 | [diff] [blame] | 2710 | |
Eric Dumazet | d654976 | 2015-05-21 21:51:19 -0700 | [diff] [blame] | 2711 | do { |
| 2712 | start = u64_stats_fetch_begin_irq(&tp->syncp); |
| 2713 | info->tcpi_bytes_acked = tp->bytes_acked; |
| 2714 | info->tcpi_bytes_received = tp->bytes_received; |
| 2715 | } while (u64_stats_fetch_retry_irq(&tp->syncp, start)); |
Marcelo Ricardo Leitner | 2efd055 | 2015-05-20 16:35:41 -0700 | [diff] [blame] | 2716 | info->tcpi_segs_out = tp->segs_out; |
| 2717 | info->tcpi_segs_in = tp->segs_in; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | EXPORT_SYMBOL_GPL(tcp_get_info); |
| 2720 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2721 | static int do_tcp_getsockopt(struct sock *sk, int level, |
| 2722 | int optname, char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | { |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2724 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2725 | struct tcp_sock *tp = tcp_sk(sk); |
| 2726 | int val, len; |
| 2727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2728 | if (get_user(len, optlen)) |
| 2729 | return -EFAULT; |
| 2730 | |
| 2731 | len = min_t(unsigned int, len, sizeof(int)); |
| 2732 | |
| 2733 | if (len < 0) |
| 2734 | return -EINVAL; |
| 2735 | |
| 2736 | switch (optname) { |
| 2737 | case TCP_MAXSEG: |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 2738 | val = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2739 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
| 2740 | val = tp->rx_opt.user_mss; |
Pavel Emelyanov | 5e6a3ce | 2012-04-19 03:41:32 +0000 | [diff] [blame] | 2741 | if (tp->repair) |
| 2742 | val = tp->rx_opt.mss_clamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | break; |
| 2744 | case TCP_NODELAY: |
| 2745 | val = !!(tp->nonagle&TCP_NAGLE_OFF); |
| 2746 | break; |
| 2747 | case TCP_CORK: |
| 2748 | val = !!(tp->nonagle&TCP_NAGLE_CORK); |
| 2749 | break; |
| 2750 | case TCP_KEEPIDLE: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2751 | val = keepalive_time_when(tp) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | break; |
| 2753 | case TCP_KEEPINTVL: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2754 | val = keepalive_intvl_when(tp) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2755 | break; |
| 2756 | case TCP_KEEPCNT: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2757 | val = keepalive_probes(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | break; |
| 2759 | case TCP_SYNCNT: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2760 | val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2761 | break; |
| 2762 | case TCP_LINGER2: |
| 2763 | val = tp->linger2; |
| 2764 | if (val >= 0) |
| 2765 | val = (val ? : sysctl_tcp_fin_timeout) / HZ; |
| 2766 | break; |
| 2767 | case TCP_DEFER_ACCEPT: |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 2768 | val = retrans_to_secs(icsk->icsk_accept_queue.rskq_defer_accept, |
| 2769 | TCP_TIMEOUT_INIT / HZ, TCP_RTO_MAX / HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2770 | break; |
| 2771 | case TCP_WINDOW_CLAMP: |
| 2772 | val = tp->window_clamp; |
| 2773 | break; |
| 2774 | case TCP_INFO: { |
| 2775 | struct tcp_info info; |
| 2776 | |
| 2777 | if (get_user(len, optlen)) |
| 2778 | return -EFAULT; |
| 2779 | |
| 2780 | tcp_get_info(sk, &info); |
| 2781 | |
| 2782 | len = min_t(unsigned int, len, sizeof(info)); |
| 2783 | if (put_user(len, optlen)) |
| 2784 | return -EFAULT; |
| 2785 | if (copy_to_user(optval, &info, len)) |
| 2786 | return -EFAULT; |
| 2787 | return 0; |
| 2788 | } |
Eric Dumazet | 6e9250f | 2015-04-28 16:23:49 -0700 | [diff] [blame] | 2789 | case TCP_CC_INFO: { |
| 2790 | const struct tcp_congestion_ops *ca_ops; |
| 2791 | union tcp_cc_info info; |
| 2792 | size_t sz = 0; |
| 2793 | int attr; |
| 2794 | |
| 2795 | if (get_user(len, optlen)) |
| 2796 | return -EFAULT; |
| 2797 | |
| 2798 | ca_ops = icsk->icsk_ca_ops; |
| 2799 | if (ca_ops && ca_ops->get_info) |
| 2800 | sz = ca_ops->get_info(sk, ~0U, &attr, &info); |
| 2801 | |
| 2802 | len = min_t(unsigned int, len, sz); |
| 2803 | if (put_user(len, optlen)) |
| 2804 | return -EFAULT; |
| 2805 | if (copy_to_user(optval, &info, len)) |
| 2806 | return -EFAULT; |
| 2807 | return 0; |
| 2808 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | case TCP_QUICKACK: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2810 | val = !icsk->icsk_ack.pingpong; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2811 | break; |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2812 | |
| 2813 | case TCP_CONGESTION: |
| 2814 | if (get_user(len, optlen)) |
| 2815 | return -EFAULT; |
| 2816 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); |
| 2817 | if (put_user(len, optlen)) |
| 2818 | return -EFAULT; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2819 | if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2820 | return -EFAULT; |
| 2821 | return 0; |
William Allen Simpson | e56fb50 | 2009-12-02 18:19:30 +0000 | [diff] [blame] | 2822 | |
Josh Hunt | 3c0fef0 | 2010-07-30 13:49:35 +0000 | [diff] [blame] | 2823 | case TCP_THIN_LINEAR_TIMEOUTS: |
| 2824 | val = tp->thin_lto; |
| 2825 | break; |
| 2826 | case TCP_THIN_DUPACK: |
| 2827 | val = tp->thin_dupack; |
| 2828 | break; |
Jerry Chu | dca43c7 | 2010-08-27 19:13:28 +0000 | [diff] [blame] | 2829 | |
Pavel Emelyanov | ee99528 | 2012-04-19 03:40:39 +0000 | [diff] [blame] | 2830 | case TCP_REPAIR: |
| 2831 | val = tp->repair; |
| 2832 | break; |
| 2833 | |
| 2834 | case TCP_REPAIR_QUEUE: |
| 2835 | if (tp->repair) |
| 2836 | val = tp->repair_queue; |
| 2837 | else |
| 2838 | return -EINVAL; |
| 2839 | break; |
| 2840 | |
| 2841 | case TCP_QUEUE_SEQ: |
| 2842 | if (tp->repair_queue == TCP_SEND_QUEUE) |
| 2843 | val = tp->write_seq; |
| 2844 | else if (tp->repair_queue == TCP_RECV_QUEUE) |
| 2845 | val = tp->rcv_nxt; |
| 2846 | else |
| 2847 | return -EINVAL; |
| 2848 | break; |
| 2849 | |
Jerry Chu | dca43c7 | 2010-08-27 19:13:28 +0000 | [diff] [blame] | 2850 | case TCP_USER_TIMEOUT: |
| 2851 | val = jiffies_to_msecs(icsk->icsk_user_timeout); |
| 2852 | break; |
Kenjiro Nakayama | 1536e28 | 2014-04-17 01:25:01 +0900 | [diff] [blame] | 2853 | |
| 2854 | case TCP_FASTOPEN: |
Eric Dumazet | 0536fcc | 2015-09-29 07:42:52 -0700 | [diff] [blame] | 2855 | val = icsk->icsk_accept_queue.fastopenq.max_qlen; |
Kenjiro Nakayama | 1536e28 | 2014-04-17 01:25:01 +0900 | [diff] [blame] | 2856 | break; |
| 2857 | |
Andrey Vagin | 93be6ce | 2013-02-11 05:50:18 +0000 | [diff] [blame] | 2858 | case TCP_TIMESTAMP: |
| 2859 | val = tcp_time_stamp + tp->tsoffset; |
| 2860 | break; |
Eric Dumazet | c9bee3b7 | 2013-07-22 20:27:07 -0700 | [diff] [blame] | 2861 | case TCP_NOTSENT_LOWAT: |
| 2862 | val = tp->notsent_lowat; |
| 2863 | break; |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 2864 | case TCP_SAVE_SYN: |
| 2865 | val = tp->save_syn; |
| 2866 | break; |
| 2867 | case TCP_SAVED_SYN: { |
| 2868 | if (get_user(len, optlen)) |
| 2869 | return -EFAULT; |
| 2870 | |
| 2871 | lock_sock(sk); |
| 2872 | if (tp->saved_syn) { |
Eric B Munson | aea0929 | 2015-05-18 14:35:58 -0400 | [diff] [blame] | 2873 | if (len < tp->saved_syn[0]) { |
| 2874 | if (put_user(tp->saved_syn[0], optlen)) { |
| 2875 | release_sock(sk); |
| 2876 | return -EFAULT; |
| 2877 | } |
| 2878 | release_sock(sk); |
| 2879 | return -EINVAL; |
| 2880 | } |
| 2881 | len = tp->saved_syn[0]; |
Eric Dumazet | cd8ae85 | 2015-05-03 21:34:46 -0700 | [diff] [blame] | 2882 | if (put_user(len, optlen)) { |
| 2883 | release_sock(sk); |
| 2884 | return -EFAULT; |
| 2885 | } |
| 2886 | if (copy_to_user(optval, tp->saved_syn + 1, len)) { |
| 2887 | release_sock(sk); |
| 2888 | return -EFAULT; |
| 2889 | } |
| 2890 | tcp_saved_syn_free(tp); |
| 2891 | release_sock(sk); |
| 2892 | } else { |
| 2893 | release_sock(sk); |
| 2894 | len = 0; |
| 2895 | if (put_user(len, optlen)) |
| 2896 | return -EFAULT; |
| 2897 | } |
| 2898 | return 0; |
| 2899 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2900 | default: |
| 2901 | return -ENOPROTOOPT; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2902 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | |
| 2904 | if (put_user(len, optlen)) |
| 2905 | return -EFAULT; |
| 2906 | if (copy_to_user(optval, &val, len)) |
| 2907 | return -EFAULT; |
| 2908 | return 0; |
| 2909 | } |
| 2910 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2911 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 2912 | int __user *optlen) |
| 2913 | { |
| 2914 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 2915 | |
| 2916 | if (level != SOL_TCP) |
| 2917 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, |
| 2918 | optval, optlen); |
| 2919 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2920 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 2921 | EXPORT_SYMBOL(tcp_getsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2922 | |
| 2923 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2924 | int compat_tcp_getsockopt(struct sock *sk, int level, int optname, |
| 2925 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2926 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 2927 | if (level != SOL_TCP) |
| 2928 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 2929 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2930 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2931 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2932 | EXPORT_SYMBOL(compat_tcp_getsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2933 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2934 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2935 | #ifdef CONFIG_TCP_MD5SIG |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2936 | static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool); |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2937 | static DEFINE_MUTEX(tcp_md5sig_mutex); |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2938 | static bool tcp_md5sig_pool_populated = false; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2939 | |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2940 | static void __tcp_alloc_md5sig_pool(void) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2941 | { |
| 2942 | int cpu; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2943 | |
| 2944 | for_each_possible_cpu(cpu) { |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2945 | if (!per_cpu(tcp_md5sig_pool, cpu).md5_desc.tfm) { |
| 2946 | struct crypto_hash *hash; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2947 | |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2948 | hash = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); |
| 2949 | if (IS_ERR_OR_NULL(hash)) |
| 2950 | return; |
| 2951 | per_cpu(tcp_md5sig_pool, cpu).md5_desc.tfm = hash; |
| 2952 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2953 | } |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2954 | /* before setting tcp_md5sig_pool_populated, we must commit all writes |
| 2955 | * to memory. See smp_rmb() in tcp_get_md5sig_pool() |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2956 | */ |
| 2957 | smp_wmb(); |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2958 | tcp_md5sig_pool_populated = true; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2959 | } |
| 2960 | |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2961 | bool tcp_alloc_md5sig_pool(void) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2962 | { |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2963 | if (unlikely(!tcp_md5sig_pool_populated)) { |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2964 | mutex_lock(&tcp_md5sig_mutex); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2965 | |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2966 | if (!tcp_md5sig_pool_populated) |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2967 | __tcp_alloc_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2968 | |
Eric Dumazet | 71cea17 | 2013-05-20 06:52:26 +0000 | [diff] [blame] | 2969 | mutex_unlock(&tcp_md5sig_mutex); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2970 | } |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2971 | return tcp_md5sig_pool_populated; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2972 | } |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2973 | EXPORT_SYMBOL(tcp_alloc_md5sig_pool); |
| 2974 | |
Eric Dumazet | 35790c0 | 2010-05-16 00:34:04 -0700 | [diff] [blame] | 2975 | |
| 2976 | /** |
| 2977 | * tcp_get_md5sig_pool - get md5sig_pool for this user |
| 2978 | * |
| 2979 | * We use percpu structure, so if we succeed, we exit with preemption |
| 2980 | * and BH disabled, to make sure another thread or softirq handling |
| 2981 | * wont try to get same context. |
| 2982 | */ |
| 2983 | struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2984 | { |
Eric Dumazet | 35790c0 | 2010-05-16 00:34:04 -0700 | [diff] [blame] | 2985 | local_bh_disable(); |
Eric Dumazet | 35790c0 | 2010-05-16 00:34:04 -0700 | [diff] [blame] | 2986 | |
Eric Dumazet | 349ce99 | 2014-10-23 12:58:58 -0700 | [diff] [blame] | 2987 | if (tcp_md5sig_pool_populated) { |
| 2988 | /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */ |
| 2989 | smp_rmb(); |
| 2990 | return this_cpu_ptr(&tcp_md5sig_pool); |
| 2991 | } |
Eric Dumazet | 35790c0 | 2010-05-16 00:34:04 -0700 | [diff] [blame] | 2992 | local_bh_enable(); |
| 2993 | return NULL; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2994 | } |
Eric Dumazet | 35790c0 | 2010-05-16 00:34:04 -0700 | [diff] [blame] | 2995 | EXPORT_SYMBOL(tcp_get_md5sig_pool); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2996 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2997 | int tcp_md5_hash_header(struct tcp_md5sig_pool *hp, |
Eric Dumazet | ca35a0e | 2011-10-24 01:52:35 -0400 | [diff] [blame] | 2998 | const struct tcphdr *th) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2999 | { |
| 3000 | struct scatterlist sg; |
Eric Dumazet | ca35a0e | 2011-10-24 01:52:35 -0400 | [diff] [blame] | 3001 | struct tcphdr hdr; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3002 | int err; |
| 3003 | |
Eric Dumazet | ca35a0e | 2011-10-24 01:52:35 -0400 | [diff] [blame] | 3004 | /* We are not allowed to change tcphdr, make a local copy */ |
| 3005 | memcpy(&hdr, th, sizeof(hdr)); |
| 3006 | hdr.check = 0; |
| 3007 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3008 | /* options aren't included in the hash */ |
Eric Dumazet | ca35a0e | 2011-10-24 01:52:35 -0400 | [diff] [blame] | 3009 | sg_init_one(&sg, &hdr, sizeof(hdr)); |
| 3010 | err = crypto_hash_update(&hp->md5_desc, &sg, sizeof(hdr)); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3011 | return err; |
| 3012 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3013 | EXPORT_SYMBOL(tcp_md5_hash_header); |
| 3014 | |
| 3015 | int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 3016 | const struct sk_buff *skb, unsigned int header_len) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3017 | { |
| 3018 | struct scatterlist sg; |
| 3019 | const struct tcphdr *tp = tcp_hdr(skb); |
| 3020 | struct hash_desc *desc = &hp->md5_desc; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 3021 | unsigned int i; |
| 3022 | const unsigned int head_data_len = skb_headlen(skb) > header_len ? |
| 3023 | skb_headlen(skb) - header_len : 0; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3024 | const struct skb_shared_info *shi = skb_shinfo(skb); |
Eric Dumazet | d7fd1b57 | 2010-05-17 20:40:51 +0000 | [diff] [blame] | 3025 | struct sk_buff *frag_iter; |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3026 | |
| 3027 | sg_init_table(&sg, 1); |
| 3028 | |
| 3029 | sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); |
| 3030 | if (crypto_hash_update(desc, &sg, head_data_len)) |
| 3031 | return 1; |
| 3032 | |
| 3033 | for (i = 0; i < shi->nr_frags; ++i) { |
| 3034 | const struct skb_frag_struct *f = &shi->frags[i]; |
Eric Dumazet | 54d27fc | 2013-05-13 21:25:52 +0000 | [diff] [blame] | 3035 | unsigned int offset = f->page_offset; |
| 3036 | struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT); |
| 3037 | |
| 3038 | sg_set_page(&sg, page, skb_frag_size(f), |
| 3039 | offset_in_page(offset)); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 3040 | if (crypto_hash_update(desc, &sg, skb_frag_size(f))) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3041 | return 1; |
| 3042 | } |
| 3043 | |
Eric Dumazet | d7fd1b57 | 2010-05-17 20:40:51 +0000 | [diff] [blame] | 3044 | skb_walk_frags(skb, frag_iter) |
| 3045 | if (tcp_md5_hash_skb_data(hp, frag_iter, 0)) |
| 3046 | return 1; |
| 3047 | |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3048 | return 0; |
| 3049 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3050 | EXPORT_SYMBOL(tcp_md5_hash_skb_data); |
| 3051 | |
Eric Dumazet | cf533ea | 2011-10-21 05:22:42 -0400 | [diff] [blame] | 3052 | int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, const struct tcp_md5sig_key *key) |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3053 | { |
| 3054 | struct scatterlist sg; |
| 3055 | |
| 3056 | sg_init_one(&sg, key->key, key->keylen); |
| 3057 | return crypto_hash_update(&hp->md5_desc, &sg, key->keylen); |
| 3058 | } |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 3059 | EXPORT_SYMBOL(tcp_md5_hash_key); |
| 3060 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 3061 | #endif |
| 3062 | |
Andi Kleen | 4ac02ba | 2007-04-20 17:11:46 -0700 | [diff] [blame] | 3063 | void tcp_done(struct sock *sk) |
| 3064 | { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 3065 | struct request_sock *req = tcp_sk(sk)->fastopen_rsk; |
| 3066 | |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 3067 | if (sk->sk_state == TCP_SYN_SENT || sk->sk_state == TCP_SYN_RECV) |
Pavel Emelyanov | 63231bd | 2008-07-16 20:22:25 -0700 | [diff] [blame] | 3068 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_ATTEMPTFAILS); |
Andi Kleen | 4ac02ba | 2007-04-20 17:11:46 -0700 | [diff] [blame] | 3069 | |
| 3070 | tcp_set_state(sk, TCP_CLOSE); |
| 3071 | tcp_clear_xmit_timers(sk); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 3072 | if (req) |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 3073 | reqsk_fastopen_remove(sk, req, false); |
Andi Kleen | 4ac02ba | 2007-04-20 17:11:46 -0700 | [diff] [blame] | 3074 | |
| 3075 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 3076 | |
| 3077 | if (!sock_flag(sk, SOCK_DEAD)) |
| 3078 | sk->sk_state_change(sk); |
| 3079 | else |
| 3080 | inet_csk_destroy_sock(sk); |
| 3081 | } |
| 3082 | EXPORT_SYMBOL_GPL(tcp_done); |
| 3083 | |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 3084 | extern struct tcp_congestion_ops tcp_reno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3085 | |
| 3086 | static __initdata unsigned long thash_entries; |
| 3087 | static int __init set_thash_entries(char *str) |
| 3088 | { |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 3089 | ssize_t ret; |
| 3090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3091 | if (!str) |
| 3092 | return 0; |
Eldad Zack | 413c27d | 2012-05-19 14:13:18 +0000 | [diff] [blame] | 3093 | |
| 3094 | ret = kstrtoul(str, 0, &thash_entries); |
| 3095 | if (ret) |
| 3096 | return 0; |
| 3097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3098 | return 1; |
| 3099 | } |
| 3100 | __setup("thash_entries=", set_thash_entries); |
| 3101 | |
Fabian Frederick | 47d7a88c | 2014-10-01 18:27:50 +0200 | [diff] [blame] | 3102 | static void __init tcp_init_mem(void) |
Glauber Costa | 4acb419 | 2012-01-30 01:20:17 +0000 | [diff] [blame] | 3103 | { |
Eric Dumazet | b66e91c | 2015-05-15 12:39:30 -0700 | [diff] [blame] | 3104 | unsigned long limit = nr_free_buffer_pages() / 16; |
| 3105 | |
Glauber Costa | 4acb419 | 2012-01-30 01:20:17 +0000 | [diff] [blame] | 3106 | limit = max(limit, 128UL); |
Eric Dumazet | b66e91c | 2015-05-15 12:39:30 -0700 | [diff] [blame] | 3107 | sysctl_tcp_mem[0] = limit / 4 * 3; /* 4.68 % */ |
| 3108 | sysctl_tcp_mem[1] = limit; /* 6.25 % */ |
| 3109 | sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; /* 9.37 % */ |
Glauber Costa | 4acb419 | 2012-01-30 01:20:17 +0000 | [diff] [blame] | 3110 | } |
| 3111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | void __init tcp_init(void) |
| 3113 | { |
Eric Dumazet | f03d78d | 2011-07-07 00:27:05 -0700 | [diff] [blame] | 3114 | unsigned long limit; |
Eric Dumazet | b49960a | 2012-05-02 02:28:41 +0000 | [diff] [blame] | 3115 | int max_rshare, max_wshare, cnt; |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 3116 | unsigned int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3117 | |
Eyal Birger | b4772ef | 2015-03-01 14:58:29 +0200 | [diff] [blame] | 3118 | sock_skb_cb_check_size(sizeof(struct tcp_skb_cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | |
Tejun Heo | 908c7f1 | 2014-09-08 09:51:29 +0900 | [diff] [blame] | 3120 | percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL); |
| 3121 | percpu_counter_init(&tcp_orphan_count, 0, GFP_KERNEL); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 3122 | tcp_hashinfo.bind_bucket_cachep = |
| 3123 | kmem_cache_create("tcp_bind_bucket", |
| 3124 | sizeof(struct inet_bind_bucket), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 3125 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | /* Size and allocate the main established and bind bucket |
| 3128 | * hash tables. |
| 3129 | * |
| 3130 | * The methodology is similar to that of the buffer cache. |
| 3131 | */ |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 3132 | tcp_hashinfo.ehash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3133 | alloc_large_system_hash("TCP established", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 3134 | sizeof(struct inet_ehash_bucket), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3135 | thash_entries, |
Eric Dumazet | fd90b29 | 2012-11-30 10:08:52 +0000 | [diff] [blame] | 3136 | 17, /* one slot per 128 KB of memory */ |
John Heffner | 9e950ef | 2006-11-06 23:10:51 -0800 | [diff] [blame] | 3137 | 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3138 | NULL, |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 3139 | &tcp_hashinfo.ehash_mask, |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 3140 | 0, |
Jean Delvare | 0ccfe61 | 2007-10-30 00:59:25 -0700 | [diff] [blame] | 3141 | thash_entries ? 0 : 512 * 1024); |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 3142 | for (i = 0; i <= tcp_hashinfo.ehash_mask; i++) |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 3143 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i); |
Eric Dumazet | 05dbc7b | 2013-10-03 00:22:02 -0700 | [diff] [blame] | 3144 | |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 3145 | if (inet_ehash_locks_alloc(&tcp_hashinfo)) |
| 3146 | panic("TCP: failed to alloc ehash_locks"); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 3147 | tcp_hashinfo.bhash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | alloc_large_system_hash("TCP bind", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 3149 | sizeof(struct inet_bind_hashbucket), |
Eric Dumazet | f373b53 | 2009-10-09 00:16:19 +0000 | [diff] [blame] | 3150 | tcp_hashinfo.ehash_mask + 1, |
Eric Dumazet | fd90b29 | 2012-11-30 10:08:52 +0000 | [diff] [blame] | 3151 | 17, /* one slot per 128 KB of memory */ |
John Heffner | 9e950ef | 2006-11-06 23:10:51 -0800 | [diff] [blame] | 3152 | 0, |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 3153 | &tcp_hashinfo.bhash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3154 | NULL, |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 3155 | 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3156 | 64 * 1024); |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 3157 | tcp_hashinfo.bhash_size = 1U << tcp_hashinfo.bhash_size; |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 3158 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
| 3159 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); |
| 3160 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3161 | } |
| 3162 | |
Eric Dumazet | c5ed63d | 2010-08-25 23:02:17 -0700 | [diff] [blame] | 3163 | |
| 3164 | cnt = tcp_hashinfo.ehash_mask + 1; |
| 3165 | |
| 3166 | tcp_death_row.sysctl_max_tw_buckets = cnt / 2; |
| 3167 | sysctl_tcp_max_orphans = cnt / 2; |
| 3168 | sysctl_max_syn_backlog = max(128, cnt / 256); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3169 | |
Eric W. Biederman | a4fe34b | 2013-10-19 16:25:36 -0700 | [diff] [blame] | 3170 | tcp_init_mem(); |
Jason Wang | c43b874 | 2012-02-02 00:07:00 +0000 | [diff] [blame] | 3171 | /* Set per-socket limits to no more than 1/128 the pressure threshold */ |
Eric Dumazet | 5fb84b1 | 2012-04-10 00:56:42 +0000 | [diff] [blame] | 3172 | limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); |
Eric Dumazet | b49960a | 2012-05-02 02:28:41 +0000 | [diff] [blame] | 3173 | max_wshare = min(4UL*1024*1024, limit); |
| 3174 | max_rshare = min(6UL*1024*1024, limit); |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 3175 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 3176 | sysctl_tcp_wmem[0] = SK_MEM_QUANTUM; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 3177 | sysctl_tcp_wmem[1] = 16*1024; |
Eric Dumazet | b49960a | 2012-05-02 02:28:41 +0000 | [diff] [blame] | 3178 | sysctl_tcp_wmem[2] = max(64*1024, max_wshare); |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 3179 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 3180 | sysctl_tcp_rmem[0] = SK_MEM_QUANTUM; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 3181 | sysctl_tcp_rmem[1] = 87380; |
Eric Dumazet | b49960a | 2012-05-02 02:28:41 +0000 | [diff] [blame] | 3182 | sysctl_tcp_rmem[2] = max(87380, max_rshare); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3183 | |
Joe Perches | afd46503 | 2012-03-12 07:03:32 +0000 | [diff] [blame] | 3184 | pr_info("Hash tables configured (established %u bind %u)\n", |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 3185 | tcp_hashinfo.ehash_mask + 1, tcp_hashinfo.bhash_size); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 3186 | |
David S. Miller | 51c5d0c | 2012-07-10 00:49:14 -0700 | [diff] [blame] | 3187 | tcp_metrics_init(); |
Florian Westphal | 55d8694 | 2014-09-26 22:37:32 +0200 | [diff] [blame] | 3188 | BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0); |
Eric Dumazet | 46d3cea | 2012-07-11 05:50:31 +0000 | [diff] [blame] | 3189 | tcp_tasklet_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3190 | } |