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 | |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 248 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | #include <linux/module.h> |
| 250 | #include <linux/types.h> |
| 251 | #include <linux/fcntl.h> |
| 252 | #include <linux/poll.h> |
| 253 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | #include <linux/fs.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 255 | #include <linux/skbuff.h> |
Andrew Morton | 81b23b4 | 2008-07-03 03:22:02 -0700 | [diff] [blame] | 256 | #include <linux/scatterlist.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 257 | #include <linux/splice.h> |
| 258 | #include <linux/net.h> |
| 259 | #include <linux/socket.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | #include <linux/random.h> |
| 261 | #include <linux/bootmem.h> |
Miquel van Smoorenburg | 57413eb | 2008-06-27 17:23:57 -0700 | [diff] [blame] | 262 | #include <linux/highmem.h> |
| 263 | #include <linux/swap.h> |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 264 | #include <linux/cache.h> |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 265 | #include <linux/err.h> |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 266 | #include <linux/crypto.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | #include <net/icmp.h> |
| 269 | #include <net/tcp.h> |
| 270 | #include <net/xfrm.h> |
| 271 | #include <net/ip.h> |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 272 | #include <net/netdma.h> |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 273 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
| 275 | #include <asm/uaccess.h> |
| 276 | #include <asm/ioctls.h> |
| 277 | |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 278 | int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 280 | struct percpu_counter tcp_orphan_count; |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 281 | EXPORT_SYMBOL_GPL(tcp_orphan_count); |
| 282 | |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 283 | int sysctl_tcp_mem[3] __read_mostly; |
| 284 | int sysctl_tcp_wmem[3] __read_mostly; |
| 285 | int sysctl_tcp_rmem[3] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
| 287 | EXPORT_SYMBOL(sysctl_tcp_mem); |
| 288 | EXPORT_SYMBOL(sysctl_tcp_rmem); |
| 289 | EXPORT_SYMBOL(sysctl_tcp_wmem); |
| 290 | |
| 291 | atomic_t tcp_memory_allocated; /* Current allocated memory. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | EXPORT_SYMBOL(tcp_memory_allocated); |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 293 | |
| 294 | /* |
| 295 | * Current number of TCP sockets. |
| 296 | */ |
| 297 | struct percpu_counter tcp_sockets_allocated; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | EXPORT_SYMBOL(tcp_sockets_allocated); |
| 299 | |
| 300 | /* |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 301 | * TCP splice context |
| 302 | */ |
| 303 | struct tcp_splice_state { |
| 304 | struct pipe_inode_info *pipe; |
| 305 | size_t len; |
| 306 | unsigned int flags; |
| 307 | }; |
| 308 | |
| 309 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | * Pressure flag: try to collapse. |
| 311 | * Technical note: it is used by multiple contexts non atomically. |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 312 | * All the __sk_mem_schedule() is of this nature: accounting |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | * is strict, actions are advisory and have some latency. |
| 314 | */ |
Eric Dumazet | 4103f8c | 2007-03-27 13:58:31 -0700 | [diff] [blame] | 315 | int tcp_memory_pressure __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | EXPORT_SYMBOL(tcp_memory_pressure); |
| 318 | |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 319 | void tcp_enter_memory_pressure(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
| 321 | if (!tcp_memory_pressure) { |
Pavel Emelyanov | 4e67344 | 2008-07-16 20:30:14 -0700 | [diff] [blame] | 322 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMEMORYPRESSURES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | tcp_memory_pressure = 1; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | EXPORT_SYMBOL(tcp_enter_memory_pressure); |
| 328 | |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 329 | /* Convert seconds to retransmits based on initial and max timeout */ |
| 330 | static u8 secs_to_retrans(int seconds, int timeout, int rto_max) |
| 331 | { |
| 332 | u8 res = 0; |
| 333 | |
| 334 | if (seconds > 0) { |
| 335 | int period = timeout; |
| 336 | |
| 337 | res = 1; |
| 338 | while (seconds > period && res < 255) { |
| 339 | res++; |
| 340 | timeout <<= 1; |
| 341 | if (timeout > rto_max) |
| 342 | timeout = rto_max; |
| 343 | period += timeout; |
| 344 | } |
| 345 | } |
| 346 | return res; |
| 347 | } |
| 348 | |
| 349 | /* Convert retransmits to seconds based on initial and max timeout */ |
| 350 | static int retrans_to_secs(u8 retrans, int timeout, int rto_max) |
| 351 | { |
| 352 | int period = 0; |
| 353 | |
| 354 | if (retrans > 0) { |
| 355 | period = timeout; |
| 356 | while (--retrans) { |
| 357 | timeout <<= 1; |
| 358 | if (timeout > rto_max) |
| 359 | timeout = rto_max; |
| 360 | period += timeout; |
| 361 | } |
| 362 | } |
| 363 | return period; |
| 364 | } |
| 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | * Wait for a TCP event. |
| 368 | * |
| 369 | * Note that we don't need to lock the socket, as the upper poll layers |
| 370 | * take care of normal races (between the test and the event) and we don't |
| 371 | * go look at any of the socket buffers directly. |
| 372 | */ |
| 373 | unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 374 | { |
| 375 | unsigned int mask; |
| 376 | struct sock *sk = sock->sk; |
| 377 | struct tcp_sock *tp = tcp_sk(sk); |
| 378 | |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 379 | sock_poll_wait(file, sk->sk_sleep, wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (sk->sk_state == TCP_LISTEN) |
Arnaldo Carvalho de Melo | dc40c7b | 2005-08-23 21:52:58 -0700 | [diff] [blame] | 381 | return inet_csk_listen_poll(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | /* Socket is not locked. We are protected from async events |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 384 | * by poll logic and correct handling of state changes |
| 385 | * made by other threads is impossible in any case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | */ |
| 387 | |
| 388 | mask = 0; |
| 389 | if (sk->sk_err) |
| 390 | mask = POLLERR; |
| 391 | |
| 392 | /* |
| 393 | * POLLHUP is certainly not done right. But poll() doesn't |
| 394 | * have a notion of HUP in just one direction, and for a |
| 395 | * socket the read side is more interesting. |
| 396 | * |
| 397 | * Some poll() documentation says that POLLHUP is incompatible |
| 398 | * with the POLLOUT/POLLWR flags, so somebody should check this |
| 399 | * all. But careful, it tends to be safer to return too many |
| 400 | * bits than too few, and you can easily break real applications |
| 401 | * if you don't tell them that something has hung up! |
| 402 | * |
| 403 | * Check-me. |
| 404 | * |
| 405 | * Check number 1. POLLHUP is _UNMASKABLE_ event (see UNIX98 and |
| 406 | * our fs/select.c). It means that after we received EOF, |
| 407 | * poll always returns immediately, making impossible poll() on write() |
| 408 | * in state CLOSE_WAIT. One solution is evident --- to set POLLHUP |
| 409 | * if and only if shutdown has been made in both directions. |
| 410 | * Actually, it is interesting to look how Solaris and DUX |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 411 | * solve this dilemma. I would prefer, if POLLHUP were maskable, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | * then we could set it on SND_SHUTDOWN. BTW examples given |
| 413 | * in Stevens' books assume exactly this behaviour, it explains |
Will Newton | 70efce2 | 2008-07-16 20:13:43 -0700 | [diff] [blame] | 414 | * why POLLHUP is incompatible with POLLOUT. --ANK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | * |
| 416 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent |
| 417 | * blocking on fresh not-connected or disconnected socket. --ANK |
| 418 | */ |
| 419 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE) |
| 420 | mask |= POLLHUP; |
| 421 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 422 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
| 424 | /* Connected? */ |
| 425 | if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
David S. Miller | c700448 | 2008-10-06 10:43:54 -0700 | [diff] [blame] | 426 | int target = sock_rcvlowat(sk, 0, INT_MAX); |
| 427 | |
| 428 | if (tp->urg_seq == tp->copied_seq && |
| 429 | !sock_flag(sk, SOCK_URGINLINE) && |
| 430 | tp->urg_data) |
| 431 | target--; |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /* Potential race condition. If read of tp below will |
| 434 | * escape above sk->sk_state, we can be illegally awaken |
| 435 | * in SYN_* states. */ |
David S. Miller | c700448 | 2008-10-06 10:43:54 -0700 | [diff] [blame] | 436 | if (tp->rcv_nxt - tp->copied_seq >= target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | mask |= POLLIN | POLLRDNORM; |
| 438 | |
| 439 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 440 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 441 | mask |= POLLOUT | POLLWRNORM; |
| 442 | } else { /* send SIGIO later */ |
| 443 | set_bit(SOCK_ASYNC_NOSPACE, |
| 444 | &sk->sk_socket->flags); |
| 445 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 446 | |
| 447 | /* Race breaker. If space is freed after |
| 448 | * wspace test but before the flags are set, |
| 449 | * IO signal will be lost. |
| 450 | */ |
| 451 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
| 452 | mask |= POLLOUT | POLLWRNORM; |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | if (tp->urg_data & TCP_URG_VALID) |
| 457 | mask |= POLLPRI; |
| 458 | } |
| 459 | return mask; |
| 460 | } |
| 461 | |
| 462 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 463 | { |
| 464 | struct tcp_sock *tp = tcp_sk(sk); |
| 465 | int answ; |
| 466 | |
| 467 | switch (cmd) { |
| 468 | case SIOCINQ: |
| 469 | if (sk->sk_state == TCP_LISTEN) |
| 470 | return -EINVAL; |
| 471 | |
| 472 | lock_sock(sk); |
| 473 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 474 | answ = 0; |
| 475 | else if (sock_flag(sk, SOCK_URGINLINE) || |
| 476 | !tp->urg_data || |
| 477 | before(tp->urg_seq, tp->copied_seq) || |
| 478 | !before(tp->urg_seq, tp->rcv_nxt)) { |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 479 | struct sk_buff *skb; |
| 480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | answ = tp->rcv_nxt - tp->copied_seq; |
| 482 | |
| 483 | /* Subtract 1, if FIN is in queue. */ |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 484 | skb = skb_peek_tail(&sk->sk_receive_queue); |
| 485 | if (answ && skb) |
| 486 | answ -= tcp_hdr(skb)->fin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } else |
| 488 | answ = tp->urg_seq - tp->copied_seq; |
| 489 | release_sock(sk); |
| 490 | break; |
| 491 | case SIOCATMARK: |
| 492 | answ = tp->urg_data && tp->urg_seq == tp->copied_seq; |
| 493 | break; |
| 494 | case SIOCOUTQ: |
| 495 | if (sk->sk_state == TCP_LISTEN) |
| 496 | return -EINVAL; |
| 497 | |
| 498 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 499 | answ = 0; |
| 500 | else |
| 501 | answ = tp->write_seq - tp->snd_una; |
| 502 | break; |
| 503 | default: |
| 504 | return -ENOIOCTLCMD; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
| 507 | return put_user(answ, (int __user *)arg); |
| 508 | } |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
| 511 | { |
| 512 | TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH; |
| 513 | tp->pushed_seq = tp->write_seq; |
| 514 | } |
| 515 | |
| 516 | static inline int forced_push(struct tcp_sock *tp) |
| 517 | { |
| 518 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); |
| 519 | } |
| 520 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 521 | static inline void skb_entail(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 523 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 352d480 | 2006-11-17 19:59:12 -0200 | [diff] [blame] | 524 | struct tcp_skb_cb *tcb = TCP_SKB_CB(skb); |
| 525 | |
| 526 | skb->csum = 0; |
| 527 | tcb->seq = tcb->end_seq = tp->write_seq; |
| 528 | tcb->flags = TCPCB_FLAG_ACK; |
| 529 | tcb->sacked = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | skb_header_release(skb); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 531 | tcp_add_write_queue_tail(sk, skb); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 532 | sk->sk_wmem_queued += skb->truesize; |
| 533 | sk_mem_charge(sk, skb->truesize); |
David S. Miller | 89ebd19 | 2005-08-23 10:13:06 -0700 | [diff] [blame] | 534 | if (tp->nonagle & TCP_NAGLE_PUSH) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 535 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags, |
| 539 | struct sk_buff *skb) |
| 540 | { |
Ilpo Järvinen | 33f5f57 | 2008-10-07 14:43:06 -0700 | [diff] [blame] | 541 | if (flags & MSG_OOB) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | tp->snd_up = tp->write_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } |
| 544 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 545 | static inline void tcp_push(struct sock *sk, int flags, int mss_now, |
| 546 | int nonagle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | { |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 548 | struct tcp_sock *tp = tcp_sk(sk); |
| 549 | |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 550 | if (tcp_send_head(sk)) { |
| 551 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | if (!(flags & MSG_MORE) || forced_push(tp)) |
| 553 | tcp_mark_push(tp, skb); |
| 554 | tcp_mark_urg(tp, flags, skb); |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 555 | __tcp_push_pending_frames(sk, mss_now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | (flags & MSG_MORE) ? TCP_NAGLE_CORK : nonagle); |
| 557 | } |
| 558 | } |
| 559 | |
Adrian Bunk | 6ff7751 | 2007-11-06 23:32:26 -0800 | [diff] [blame] | 560 | static int tcp_splice_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, |
| 561 | unsigned int offset, size_t len) |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 562 | { |
| 563 | struct tcp_splice_state *tss = rd_desc->arg.data; |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 564 | int ret; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 565 | |
Dimitris Michailidis | 9fa5fdf | 2009-01-26 22:15:31 -0800 | [diff] [blame] | 566 | ret = skb_splice_bits(skb, offset, tss->pipe, min(rd_desc->count, len), |
| 567 | tss->flags); |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 568 | if (ret > 0) |
| 569 | rd_desc->count -= ret; |
| 570 | return ret; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 571 | } |
| 572 | |
| 573 | static int __tcp_splice_read(struct sock *sk, struct tcp_splice_state *tss) |
| 574 | { |
| 575 | /* Store TCP splice context information in read_descriptor_t. */ |
| 576 | read_descriptor_t rd_desc = { |
| 577 | .arg.data = tss, |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 578 | .count = tss->len, |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 579 | }; |
| 580 | |
| 581 | return tcp_read_sock(sk, &rd_desc, tcp_splice_data_recv); |
| 582 | } |
| 583 | |
| 584 | /** |
| 585 | * tcp_splice_read - splice data from TCP socket to a pipe |
| 586 | * @sock: socket to splice from |
| 587 | * @ppos: position (not valid) |
| 588 | * @pipe: pipe to splice to |
| 589 | * @len: number of bytes to splice |
| 590 | * @flags: splice modifier flags |
| 591 | * |
| 592 | * Description: |
| 593 | * Will read pages from given socket and fill them into a pipe. |
| 594 | * |
| 595 | **/ |
| 596 | ssize_t tcp_splice_read(struct socket *sock, loff_t *ppos, |
| 597 | struct pipe_inode_info *pipe, size_t len, |
| 598 | unsigned int flags) |
| 599 | { |
| 600 | struct sock *sk = sock->sk; |
| 601 | struct tcp_splice_state tss = { |
| 602 | .pipe = pipe, |
| 603 | .len = len, |
| 604 | .flags = flags, |
| 605 | }; |
| 606 | long timeo; |
| 607 | ssize_t spliced; |
| 608 | int ret; |
| 609 | |
| 610 | /* |
| 611 | * We can't seek on a socket input |
| 612 | */ |
| 613 | if (unlikely(*ppos)) |
| 614 | return -ESPIPE; |
| 615 | |
| 616 | ret = spliced = 0; |
| 617 | |
| 618 | lock_sock(sk); |
| 619 | |
Eric Dumazet | 42324c6 | 2009-10-01 15:26:00 -0700 | [diff] [blame] | 620 | timeo = sock_rcvtimeo(sk, sock->file->f_flags & O_NONBLOCK); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 621 | while (tss.len) { |
| 622 | ret = __tcp_splice_read(sk, &tss); |
| 623 | if (ret < 0) |
| 624 | break; |
| 625 | else if (!ret) { |
| 626 | if (spliced) |
| 627 | break; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 628 | if (sock_flag(sk, SOCK_DONE)) |
| 629 | break; |
| 630 | if (sk->sk_err) { |
| 631 | ret = sock_error(sk); |
| 632 | break; |
| 633 | } |
| 634 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 635 | break; |
| 636 | if (sk->sk_state == TCP_CLOSE) { |
| 637 | /* |
| 638 | * This occurs when user tries to read |
| 639 | * from never connected socket. |
| 640 | */ |
| 641 | if (!sock_flag(sk, SOCK_DONE)) |
| 642 | ret = -ENOTCONN; |
| 643 | break; |
| 644 | } |
| 645 | if (!timeo) { |
| 646 | ret = -EAGAIN; |
| 647 | break; |
| 648 | } |
| 649 | sk_wait_data(sk, &timeo); |
| 650 | if (signal_pending(current)) { |
| 651 | ret = sock_intr_errno(timeo); |
| 652 | break; |
| 653 | } |
| 654 | continue; |
| 655 | } |
| 656 | tss.len -= ret; |
| 657 | spliced += ret; |
| 658 | |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 659 | if (!timeo) |
| 660 | break; |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 661 | release_sock(sk); |
| 662 | lock_sock(sk); |
| 663 | |
| 664 | if (sk->sk_err || sk->sk_state == TCP_CLOSE || |
Willy Tarreau | 33966dd | 2009-01-13 16:04:36 -0800 | [diff] [blame] | 665 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 666 | signal_pending(current)) |
| 667 | break; |
| 668 | } |
| 669 | |
| 670 | release_sock(sk); |
| 671 | |
| 672 | if (spliced) |
| 673 | return spliced; |
| 674 | |
| 675 | return ret; |
| 676 | } |
| 677 | |
Pavel Emelyanov | df97c70 | 2007-11-29 21:22:33 +1100 | [diff] [blame] | 678 | struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp) |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 679 | { |
| 680 | struct sk_buff *skb; |
| 681 | |
| 682 | /* The TCP header must be at least 32-bit aligned. */ |
| 683 | size = ALIGN(size, 4); |
| 684 | |
| 685 | skb = alloc_skb_fclone(size + sk->sk_prot->max_header, gfp); |
| 686 | if (skb) { |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 687 | if (sk_wmem_schedule(sk, skb->truesize)) { |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 688 | /* |
| 689 | * Make sure that we have exactly size bytes |
| 690 | * available to the caller, no more, no less. |
| 691 | */ |
| 692 | skb_reserve(skb, skb_tailroom(skb) - size); |
| 693 | return skb; |
| 694 | } |
| 695 | __kfree_skb(skb); |
| 696 | } else { |
Pavel Emelyanov | 5c52ba1 | 2008-07-16 20:28:10 -0700 | [diff] [blame] | 697 | sk->sk_prot->enter_memory_pressure(sk); |
Pavel Emelyanov | f561d0f | 2007-11-29 20:28:50 +1100 | [diff] [blame] | 698 | sk_stream_moderate_sndbuf(sk); |
| 699 | } |
| 700 | return NULL; |
| 701 | } |
| 702 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 703 | static unsigned int tcp_xmit_size_goal(struct sock *sk, u32 mss_now, |
| 704 | int large_allowed) |
| 705 | { |
| 706 | struct tcp_sock *tp = tcp_sk(sk); |
Ilpo Järvinen | 2a3a041 | 2009-03-14 22:45:16 +0000 | [diff] [blame] | 707 | u32 xmit_size_goal, old_size_goal; |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 708 | |
| 709 | xmit_size_goal = mss_now; |
| 710 | |
| 711 | if (large_allowed && sk_can_gso(sk)) { |
| 712 | xmit_size_goal = ((sk->sk_gso_max_size - 1) - |
| 713 | inet_csk(sk)->icsk_af_ops->net_header_len - |
| 714 | inet_csk(sk)->icsk_ext_hdr_len - |
| 715 | tp->tcp_header_len); |
| 716 | |
| 717 | xmit_size_goal = tcp_bound_to_half_wnd(tp, xmit_size_goal); |
Ilpo Järvinen | 2a3a041 | 2009-03-14 22:45:16 +0000 | [diff] [blame] | 718 | |
| 719 | /* We try hard to avoid divides here */ |
| 720 | old_size_goal = tp->xmit_size_goal_segs * mss_now; |
| 721 | |
| 722 | if (likely(old_size_goal <= xmit_size_goal && |
| 723 | old_size_goal + mss_now > xmit_size_goal)) { |
| 724 | xmit_size_goal = old_size_goal; |
| 725 | } else { |
| 726 | tp->xmit_size_goal_segs = xmit_size_goal / mss_now; |
| 727 | xmit_size_goal = tp->xmit_size_goal_segs * mss_now; |
| 728 | } |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 729 | } |
| 730 | |
Ilpo Järvinen | afece1c | 2009-03-14 14:23:07 +0000 | [diff] [blame] | 731 | return max(xmit_size_goal, mss_now); |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | static int tcp_send_mss(struct sock *sk, int *size_goal, int flags) |
| 735 | { |
| 736 | int mss_now; |
| 737 | |
| 738 | mss_now = tcp_current_mss(sk); |
| 739 | *size_goal = tcp_xmit_size_goal(sk, mss_now, !(flags & MSG_OOB)); |
| 740 | |
| 741 | return mss_now; |
| 742 | } |
| 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset, |
| 745 | size_t psize, int flags) |
| 746 | { |
| 747 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 748 | int mss_now, size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | int err; |
| 750 | ssize_t copied; |
| 751 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 752 | |
| 753 | /* Wait for a connection to finish. */ |
| 754 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) |
| 755 | if ((err = sk_stream_wait_connect(sk, &timeo)) != 0) |
| 756 | goto out_err; |
| 757 | |
| 758 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 759 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 760 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | copied = 0; |
| 762 | |
| 763 | err = -EPIPE; |
| 764 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
Ilpo Järvinen | 0d6a775 | 2009-02-28 04:44:41 +0000 | [diff] [blame] | 765 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
| 767 | while (psize > 0) { |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 768 | struct sk_buff *skb = tcp_write_queue_tail(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | struct page *page = pages[poffset / PAGE_SIZE]; |
| 770 | int copy, i, can_coalesce; |
| 771 | int offset = poffset % PAGE_SIZE; |
| 772 | int size = min_t(size_t, psize, PAGE_SIZE - offset); |
| 773 | |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 774 | if (!tcp_send_head(sk) || (copy = size_goal - skb->len) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | new_segment: |
| 776 | if (!sk_stream_memory_free(sk)) |
| 777 | goto wait_for_sndbuf; |
| 778 | |
Pavel Emelyanov | df97c70 | 2007-11-29 21:22:33 +1100 | [diff] [blame] | 779 | skb = sk_stream_alloc_skb(sk, 0, sk->sk_allocation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | if (!skb) |
| 781 | goto wait_for_memory; |
| 782 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 783 | skb_entail(sk, skb); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 784 | copy = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | |
| 787 | if (copy > size) |
| 788 | copy = size; |
| 789 | |
| 790 | i = skb_shinfo(skb)->nr_frags; |
| 791 | can_coalesce = skb_can_coalesce(skb, i, page, offset); |
| 792 | if (!can_coalesce && i >= MAX_SKB_FRAGS) { |
| 793 | tcp_mark_push(tp, skb); |
| 794 | goto new_segment; |
| 795 | } |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 796 | if (!sk_wmem_schedule(sk, copy)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | goto wait_for_memory; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | if (can_coalesce) { |
| 800 | skb_shinfo(skb)->frags[i - 1].size += copy; |
| 801 | } else { |
| 802 | get_page(page); |
| 803 | skb_fill_page_desc(skb, i, page, offset, copy); |
| 804 | } |
| 805 | |
| 806 | skb->len += copy; |
| 807 | skb->data_len += copy; |
| 808 | skb->truesize += copy; |
| 809 | sk->sk_wmem_queued += copy; |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 810 | sk_mem_charge(sk, copy); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 811 | skb->ip_summed = CHECKSUM_PARTIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | tp->write_seq += copy; |
| 813 | TCP_SKB_CB(skb)->end_seq += copy; |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 814 | skb_shinfo(skb)->gso_segs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | if (!copied) |
| 817 | TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH; |
| 818 | |
| 819 | copied += copy; |
| 820 | poffset += copy; |
| 821 | if (!(psize -= copy)) |
| 822 | goto out; |
| 823 | |
Herbert Xu | 69d1506 | 2008-03-22 15:47:05 -0700 | [diff] [blame] | 824 | if (skb->len < size_goal || (flags & MSG_OOB)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | continue; |
| 826 | |
| 827 | if (forced_push(tp)) { |
| 828 | tcp_mark_push(tp, skb); |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 829 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 830 | } else if (skb == tcp_send_head(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | tcp_push_one(sk, mss_now); |
| 832 | continue; |
| 833 | |
| 834 | wait_for_sndbuf: |
| 835 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 836 | wait_for_memory: |
| 837 | if (copied) |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 838 | tcp_push(sk, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | |
| 840 | if ((err = sk_stream_wait_memory(sk, &timeo)) != 0) |
| 841 | goto do_error; |
| 842 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 843 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | out: |
| 847 | if (copied) |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 848 | tcp_push(sk, flags, mss_now, tp->nonagle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | return copied; |
| 850 | |
| 851 | do_error: |
| 852 | if (copied) |
| 853 | goto out; |
| 854 | out_err: |
| 855 | return sk_stream_error(sk, flags, err); |
| 856 | } |
| 857 | |
| 858 | ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, |
| 859 | size_t size, int flags) |
| 860 | { |
| 861 | ssize_t res; |
| 862 | struct sock *sk = sock->sk; |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | if (!(sk->sk_route_caps & NETIF_F_SG) || |
Herbert Xu | 8648b30 | 2006-06-17 22:06:05 -0700 | [diff] [blame] | 865 | !(sk->sk_route_caps & NETIF_F_ALL_CSUM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 867 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | lock_sock(sk); |
| 869 | TCP_CHECK_TIMER(sk); |
| 870 | res = do_tcp_sendpages(sk, &page, offset, size, flags); |
| 871 | TCP_CHECK_TIMER(sk); |
| 872 | release_sock(sk); |
| 873 | return res; |
| 874 | } |
| 875 | |
| 876 | #define TCP_PAGE(sk) (sk->sk_sndmsg_page) |
| 877 | #define TCP_OFF(sk) (sk->sk_sndmsg_off) |
| 878 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 879 | static inline int select_size(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | { |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 881 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 882 | int tmp = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
David S. Miller | b4e26f5 | 2005-07-05 15:20:27 -0700 | [diff] [blame] | 884 | if (sk->sk_route_caps & NETIF_F_SG) { |
Herbert Xu | bcd7611 | 2006-06-30 13:36:35 -0700 | [diff] [blame] | 885 | if (sk_can_gso(sk)) |
David S. Miller | b4e26f5 | 2005-07-05 15:20:27 -0700 | [diff] [blame] | 886 | tmp = 0; |
| 887 | else { |
| 888 | int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER); |
| 889 | |
| 890 | if (tmp >= pgbreak && |
| 891 | tmp <= pgbreak + (MAX_SKB_FRAGS - 1) * PAGE_SIZE) |
| 892 | tmp = pgbreak; |
| 893 | } |
| 894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return tmp; |
| 897 | } |
| 898 | |
David S. Miller | 3516ffb | 2007-08-02 19:23:56 -0700 | [diff] [blame] | 899 | int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | size_t size) |
| 901 | { |
David S. Miller | 3516ffb | 2007-08-02 19:23:56 -0700 | [diff] [blame] | 902 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | struct iovec *iov; |
| 904 | struct tcp_sock *tp = tcp_sk(sk); |
| 905 | struct sk_buff *skb; |
| 906 | int iovlen, flags; |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 907 | int mss_now, size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | int err, copied; |
| 909 | long timeo; |
| 910 | |
| 911 | lock_sock(sk); |
| 912 | TCP_CHECK_TIMER(sk); |
| 913 | |
| 914 | flags = msg->msg_flags; |
| 915 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 916 | |
| 917 | /* Wait for a connection to finish. */ |
| 918 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) |
| 919 | if ((err = sk_stream_wait_connect(sk, &timeo)) != 0) |
| 920 | goto out_err; |
| 921 | |
| 922 | /* This should be in poll */ |
| 923 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 924 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 925 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
| 927 | /* Ok commence sending. */ |
| 928 | iovlen = msg->msg_iovlen; |
| 929 | iov = msg->msg_iov; |
| 930 | copied = 0; |
| 931 | |
| 932 | err = -EPIPE; |
| 933 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
Ilpo Järvinen | 0d6a775 | 2009-02-28 04:44:41 +0000 | [diff] [blame] | 934 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | |
| 936 | while (--iovlen >= 0) { |
| 937 | int seglen = iov->iov_len; |
| 938 | unsigned char __user *from = iov->iov_base; |
| 939 | |
| 940 | iov++; |
| 941 | |
| 942 | while (seglen > 0) { |
Herbert Xu | 6828b92 | 2009-06-28 18:06:41 +0000 | [diff] [blame] | 943 | int copy = 0; |
| 944 | int max = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 946 | skb = tcp_write_queue_tail(sk); |
Herbert Xu | 6828b92 | 2009-06-28 18:06:41 +0000 | [diff] [blame] | 947 | if (tcp_send_head(sk)) { |
| 948 | if (skb->ip_summed == CHECKSUM_NONE) |
| 949 | max = mss_now; |
| 950 | copy = max - skb->len; |
| 951 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
Herbert Xu | 6828b92 | 2009-06-28 18:06:41 +0000 | [diff] [blame] | 953 | if (copy <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | new_segment: |
| 955 | /* Allocate new segment. If the interface is SG, |
| 956 | * allocate skb fitting to single page. |
| 957 | */ |
| 958 | if (!sk_stream_memory_free(sk)) |
| 959 | goto wait_for_sndbuf; |
| 960 | |
Pavel Emelyanov | df97c70 | 2007-11-29 21:22:33 +1100 | [diff] [blame] | 961 | skb = sk_stream_alloc_skb(sk, select_size(sk), |
| 962 | sk->sk_allocation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | if (!skb) |
| 964 | goto wait_for_memory; |
| 965 | |
| 966 | /* |
| 967 | * Check whether we can use HW checksum. |
| 968 | */ |
Herbert Xu | 8648b30 | 2006-06-17 22:06:05 -0700 | [diff] [blame] | 969 | if (sk->sk_route_caps & NETIF_F_ALL_CSUM) |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 970 | skb->ip_summed = CHECKSUM_PARTIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 972 | skb_entail(sk, skb); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 973 | copy = size_goal; |
Herbert Xu | 6828b92 | 2009-06-28 18:06:41 +0000 | [diff] [blame] | 974 | max = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | /* Try to append data to the end of skb. */ |
| 978 | if (copy > seglen) |
| 979 | copy = seglen; |
| 980 | |
| 981 | /* Where to copy to? */ |
| 982 | if (skb_tailroom(skb) > 0) { |
| 983 | /* We have some space in skb head. Superb! */ |
| 984 | if (copy > skb_tailroom(skb)) |
| 985 | copy = skb_tailroom(skb); |
| 986 | if ((err = skb_add_data(skb, from, copy)) != 0) |
| 987 | goto do_fault; |
| 988 | } else { |
| 989 | int merge = 0; |
| 990 | int i = skb_shinfo(skb)->nr_frags; |
| 991 | struct page *page = TCP_PAGE(sk); |
| 992 | int off = TCP_OFF(sk); |
| 993 | |
| 994 | if (skb_can_coalesce(skb, i, page, off) && |
| 995 | off != PAGE_SIZE) { |
| 996 | /* We can extend the last page |
| 997 | * fragment. */ |
| 998 | merge = 1; |
| 999 | } else if (i == MAX_SKB_FRAGS || |
| 1000 | (!i && |
| 1001 | !(sk->sk_route_caps & NETIF_F_SG))) { |
| 1002 | /* Need to add new fragment and cannot |
| 1003 | * do this because interface is non-SG, |
| 1004 | * or because all the page slots are |
| 1005 | * busy. */ |
| 1006 | tcp_mark_push(tp, skb); |
| 1007 | goto new_segment; |
| 1008 | } else if (page) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | if (off == PAGE_SIZE) { |
| 1010 | put_page(page); |
| 1011 | TCP_PAGE(sk) = page = NULL; |
Herbert Xu | fb5f5e6 | 2005-09-05 18:55:48 -0700 | [diff] [blame] | 1012 | off = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | } |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 1014 | } else |
Herbert Xu | fb5f5e6 | 2005-09-05 18:55:48 -0700 | [diff] [blame] | 1015 | off = 0; |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 1016 | |
| 1017 | if (copy > PAGE_SIZE - off) |
| 1018 | copy = PAGE_SIZE - off; |
| 1019 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1020 | if (!sk_wmem_schedule(sk, copy)) |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 1021 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
| 1023 | if (!page) { |
| 1024 | /* Allocate new cache page. */ |
| 1025 | if (!(page = sk_stream_alloc_page(sk))) |
| 1026 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | } |
| 1028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | /* Time to copy data. We are close to |
| 1030 | * the end! */ |
| 1031 | err = skb_copy_to_page(sk, from, skb, page, |
| 1032 | off, copy); |
| 1033 | if (err) { |
| 1034 | /* If this page was new, give it to the |
| 1035 | * socket so it does not get leaked. |
| 1036 | */ |
| 1037 | if (!TCP_PAGE(sk)) { |
| 1038 | TCP_PAGE(sk) = page; |
| 1039 | TCP_OFF(sk) = 0; |
| 1040 | } |
| 1041 | goto do_error; |
| 1042 | } |
| 1043 | |
| 1044 | /* Update the skb. */ |
| 1045 | if (merge) { |
| 1046 | skb_shinfo(skb)->frags[i - 1].size += |
| 1047 | copy; |
| 1048 | } else { |
| 1049 | skb_fill_page_desc(skb, i, page, off, copy); |
| 1050 | if (TCP_PAGE(sk)) { |
| 1051 | get_page(page); |
| 1052 | } else if (off + copy < PAGE_SIZE) { |
| 1053 | get_page(page); |
| 1054 | TCP_PAGE(sk) = page; |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | TCP_OFF(sk) = off + copy; |
| 1059 | } |
| 1060 | |
| 1061 | if (!copied) |
| 1062 | TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH; |
| 1063 | |
| 1064 | tp->write_seq += copy; |
| 1065 | TCP_SKB_CB(skb)->end_seq += copy; |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 1066 | skb_shinfo(skb)->gso_segs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
| 1068 | from += copy; |
| 1069 | copied += copy; |
| 1070 | if ((seglen -= copy) == 0 && iovlen == 0) |
| 1071 | goto out; |
| 1072 | |
Herbert Xu | 6828b92 | 2009-06-28 18:06:41 +0000 | [diff] [blame] | 1073 | if (skb->len < max || (flags & MSG_OOB)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | continue; |
| 1075 | |
| 1076 | if (forced_push(tp)) { |
| 1077 | tcp_mark_push(tp, skb); |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 1078 | __tcp_push_pending_frames(sk, mss_now, TCP_NAGLE_PUSH); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1079 | } else if (skb == tcp_send_head(sk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | tcp_push_one(sk, mss_now); |
| 1081 | continue; |
| 1082 | |
| 1083 | wait_for_sndbuf: |
| 1084 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1085 | wait_for_memory: |
| 1086 | if (copied) |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 1087 | tcp_push(sk, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
| 1089 | if ((err = sk_stream_wait_memory(sk, &timeo)) != 0) |
| 1090 | goto do_error; |
| 1091 | |
Ilpo Järvinen | 0c54b85 | 2009-03-14 14:23:05 +0000 | [diff] [blame] | 1092 | mss_now = tcp_send_mss(sk, &size_goal, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | out: |
| 1097 | if (copied) |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 1098 | tcp_push(sk, flags, mss_now, tp->nonagle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | TCP_CHECK_TIMER(sk); |
| 1100 | release_sock(sk); |
| 1101 | return copied; |
| 1102 | |
| 1103 | do_fault: |
| 1104 | if (!skb->len) { |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 1105 | tcp_unlink_write_queue(skb, sk); |
| 1106 | /* It is the one place in all of TCP, except connection |
| 1107 | * reset, where we can be unlinking the send_head. |
| 1108 | */ |
| 1109 | tcp_check_send_head(sk, skb); |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1110 | sk_wmem_free_skb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | |
| 1113 | do_error: |
| 1114 | if (copied) |
| 1115 | goto out; |
| 1116 | out_err: |
| 1117 | err = sk_stream_error(sk, flags, err); |
| 1118 | TCP_CHECK_TIMER(sk); |
| 1119 | release_sock(sk); |
| 1120 | return err; |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * Handle reading urgent data. BSD has very simple semantics for |
| 1125 | * this, no blocking and very strange errors 8) |
| 1126 | */ |
| 1127 | |
Rami Rosen | 377f0a0 | 2009-03-31 14:43:17 -0700 | [diff] [blame] | 1128 | 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] | 1129 | { |
| 1130 | struct tcp_sock *tp = tcp_sk(sk); |
| 1131 | |
| 1132 | /* No URG data to read. */ |
| 1133 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || |
| 1134 | tp->urg_data == TCP_URG_READ) |
| 1135 | return -EINVAL; /* Yes this is right ! */ |
| 1136 | |
| 1137 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) |
| 1138 | return -ENOTCONN; |
| 1139 | |
| 1140 | if (tp->urg_data & TCP_URG_VALID) { |
| 1141 | int err = 0; |
| 1142 | char c = tp->urg_data; |
| 1143 | |
| 1144 | if (!(flags & MSG_PEEK)) |
| 1145 | tp->urg_data = TCP_URG_READ; |
| 1146 | |
| 1147 | /* Read urgent data. */ |
| 1148 | msg->msg_flags |= MSG_OOB; |
| 1149 | |
| 1150 | if (len > 0) { |
| 1151 | if (!(flags & MSG_TRUNC)) |
| 1152 | err = memcpy_toiovec(msg->msg_iov, &c, 1); |
| 1153 | len = 1; |
| 1154 | } else |
| 1155 | msg->msg_flags |= MSG_TRUNC; |
| 1156 | |
| 1157 | return err ? -EFAULT : len; |
| 1158 | } |
| 1159 | |
| 1160 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 1161 | return 0; |
| 1162 | |
| 1163 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and |
| 1164 | * the available implementations agree in this case: |
| 1165 | * this call should never block, independent of the |
| 1166 | * blocking state of the socket. |
| 1167 | * Mike <pall@rz.uni-karlsruhe.de> |
| 1168 | */ |
| 1169 | return -EAGAIN; |
| 1170 | } |
| 1171 | |
| 1172 | /* Clean up the receive buffer for full frames taken by the user, |
| 1173 | * then send an ACK if necessary. COPIED is the number of bytes |
| 1174 | * tcp_recvmsg has given to the user so far, it speeds up the |
| 1175 | * calculation of whether or not we must ACK for the sake of |
| 1176 | * a window update. |
| 1177 | */ |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1178 | void tcp_cleanup_rbuf(struct sock *sk, int copied) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | { |
| 1180 | struct tcp_sock *tp = tcp_sk(sk); |
| 1181 | int time_to_ack = 0; |
| 1182 | |
| 1183 | #if TCP_DEBUG |
| 1184 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
| 1185 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1186 | WARN_ON(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | #endif |
| 1188 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1189 | if (inet_csk_ack_scheduled(sk)) { |
| 1190 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | /* Delayed ACKs frequently hit locked sockets during bulk |
| 1192 | * receive. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1193 | if (icsk->icsk_ack.blocked || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | /* 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] | 1195 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | /* |
| 1197 | * If this read emptied read buffer, we send ACK, if |
| 1198 | * connection is not bidirectional, user drained |
| 1199 | * receive buffer and there was a small segment |
| 1200 | * in queue. |
| 1201 | */ |
Alexey Kuznetsov | 1ef9696 | 2006-09-19 12:52:50 -0700 | [diff] [blame] | 1202 | (copied > 0 && |
| 1203 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED2) || |
| 1204 | ((icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && |
| 1205 | !icsk->icsk_ack.pingpong)) && |
| 1206 | !atomic_read(&sk->sk_rmem_alloc))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | time_to_ack = 1; |
| 1208 | } |
| 1209 | |
| 1210 | /* We send an ACK if we can now advertise a non-zero window |
| 1211 | * which has been raised "significantly". |
| 1212 | * |
| 1213 | * Even if window raised up to infinity, do not send window open ACK |
| 1214 | * in states, where we will not receive more. It is useless. |
| 1215 | */ |
| 1216 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
| 1217 | __u32 rcv_window_now = tcp_receive_window(tp); |
| 1218 | |
| 1219 | /* Optimize, __tcp_select_window() is not cheap. */ |
| 1220 | if (2*rcv_window_now <= tp->window_clamp) { |
| 1221 | __u32 new_window = __tcp_select_window(sk); |
| 1222 | |
| 1223 | /* Send ACK now, if this read freed lots of space |
| 1224 | * in our buffer. Certainly, new_window is new window. |
| 1225 | * We can advertise it now, if it is not less than current one. |
| 1226 | * "Lots" means "at least twice" here. |
| 1227 | */ |
| 1228 | if (new_window && new_window >= 2 * rcv_window_now) |
| 1229 | time_to_ack = 1; |
| 1230 | } |
| 1231 | } |
| 1232 | if (time_to_ack) |
| 1233 | tcp_send_ack(sk); |
| 1234 | } |
| 1235 | |
| 1236 | static void tcp_prequeue_process(struct sock *sk) |
| 1237 | { |
| 1238 | struct sk_buff *skb; |
| 1239 | struct tcp_sock *tp = tcp_sk(sk); |
| 1240 | |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 1241 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPPREQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | |
| 1243 | /* RX process wants to run with disabled BHs, though it is not |
| 1244 | * necessary */ |
| 1245 | local_bh_disable(); |
| 1246 | while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) |
Peter Zijlstra | c57943a | 2008-10-07 14:18:42 -0700 | [diff] [blame] | 1247 | sk_backlog_rcv(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | local_bh_enable(); |
| 1249 | |
| 1250 | /* Clear memory counter. */ |
| 1251 | tp->ucopy.memory = 0; |
| 1252 | } |
| 1253 | |
| 1254 | static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
| 1255 | { |
| 1256 | struct sk_buff *skb; |
| 1257 | u32 offset; |
| 1258 | |
| 1259 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
| 1260 | offset = seq - TCP_SKB_CB(skb)->seq; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1261 | if (tcp_hdr(skb)->syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | offset--; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1263 | if (offset < skb->len || tcp_hdr(skb)->fin) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | *off = offset; |
| 1265 | return skb; |
| 1266 | } |
| 1267 | } |
| 1268 | return NULL; |
| 1269 | } |
| 1270 | |
| 1271 | /* |
| 1272 | * This routine provides an alternative to tcp_recvmsg() for routines |
| 1273 | * that would like to handle copying from skbuffs directly in 'sendfile' |
| 1274 | * fashion. |
| 1275 | * Note: |
| 1276 | * - It is assumed that the socket was locked by the caller. |
| 1277 | * - The routine does not block. |
| 1278 | * - At present, there is no support for reading OOB data |
| 1279 | * or for 'peeking' the socket using this routine |
| 1280 | * (although both would be easy to implement). |
| 1281 | */ |
| 1282 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, |
| 1283 | sk_read_actor_t recv_actor) |
| 1284 | { |
| 1285 | struct sk_buff *skb; |
| 1286 | struct tcp_sock *tp = tcp_sk(sk); |
| 1287 | u32 seq = tp->copied_seq; |
| 1288 | u32 offset; |
| 1289 | int copied = 0; |
| 1290 | |
| 1291 | if (sk->sk_state == TCP_LISTEN) |
| 1292 | return -ENOTCONN; |
| 1293 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { |
| 1294 | if (offset < skb->len) { |
Octavian Purdila | 374e7b5 | 2008-07-03 03:31:21 -0700 | [diff] [blame] | 1295 | int used; |
| 1296 | size_t len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
| 1298 | len = skb->len - offset; |
| 1299 | /* Stop reading if we hit a patch of urgent data */ |
| 1300 | if (tp->urg_data) { |
| 1301 | u32 urg_offset = tp->urg_seq - seq; |
| 1302 | if (urg_offset < len) |
| 1303 | len = urg_offset; |
| 1304 | if (!len) |
| 1305 | break; |
| 1306 | } |
| 1307 | used = recv_actor(desc, skb, offset, len); |
Jens Axboe | ddb61a5 | 2007-06-23 23:07:50 -0700 | [diff] [blame] | 1308 | if (used < 0) { |
| 1309 | if (!copied) |
| 1310 | copied = used; |
| 1311 | break; |
| 1312 | } else if (used <= len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | seq += used; |
| 1314 | copied += used; |
| 1315 | offset += used; |
| 1316 | } |
Octavian Purdila | 293ad60 | 2008-06-04 15:45:58 -0700 | [diff] [blame] | 1317 | /* |
| 1318 | * If recv_actor drops the lock (e.g. TCP splice |
| 1319 | * receive) the skb pointer might be invalid when |
| 1320 | * getting here: tcp_collapse might have deleted it |
| 1321 | * while aggregating skbs from the socket queue. |
| 1322 | */ |
| 1323 | skb = tcp_recv_skb(sk, seq-1, &offset); |
| 1324 | if (!skb || (offset+1 != skb->len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | break; |
| 1326 | } |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1327 | if (tcp_hdr(skb)->fin) { |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1328 | sk_eat_skb(sk, skb, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | ++seq; |
| 1330 | break; |
| 1331 | } |
Chris Leech | 624d116 | 2006-05-23 18:01:28 -0700 | [diff] [blame] | 1332 | sk_eat_skb(sk, skb, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | if (!desc->count) |
| 1334 | break; |
| 1335 | } |
| 1336 | tp->copied_seq = seq; |
| 1337 | |
| 1338 | tcp_rcv_space_adjust(sk); |
| 1339 | |
| 1340 | /* Clean up data we have read: This will do ACK frames. */ |
Jens Axboe | ddb61a5 | 2007-06-23 23:07:50 -0700 | [diff] [blame] | 1341 | if (copied > 0) |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1342 | tcp_cleanup_rbuf(sk, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | return copied; |
| 1344 | } |
| 1345 | |
| 1346 | /* |
| 1347 | * This routine copies from a sock struct into the user buffer. |
| 1348 | * |
| 1349 | * Technical note: in 2.3 we work on _locked_ socket, so that |
| 1350 | * tricks with *seq access order and skb->users are not required. |
| 1351 | * Probably, code can be easily improved even more. |
| 1352 | */ |
| 1353 | |
| 1354 | int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 1355 | size_t len, int nonblock, int flags, int *addr_len) |
| 1356 | { |
| 1357 | struct tcp_sock *tp = tcp_sk(sk); |
| 1358 | int copied = 0; |
| 1359 | u32 peek_seq; |
| 1360 | u32 *seq; |
| 1361 | unsigned long used; |
| 1362 | int err; |
| 1363 | int target; /* Read at least this many bytes */ |
| 1364 | long timeo; |
| 1365 | struct task_struct *user_recv = NULL; |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1366 | int copied_early = 0; |
Chris Leech | 2b1244a | 2007-03-08 09:57:36 -0800 | [diff] [blame] | 1367 | struct sk_buff *skb; |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1368 | u32 urg_hole = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
| 1370 | lock_sock(sk); |
| 1371 | |
| 1372 | TCP_CHECK_TIMER(sk); |
| 1373 | |
| 1374 | err = -ENOTCONN; |
| 1375 | if (sk->sk_state == TCP_LISTEN) |
| 1376 | goto out; |
| 1377 | |
| 1378 | timeo = sock_rcvtimeo(sk, nonblock); |
| 1379 | |
| 1380 | /* Urgent data needs to be handled specially. */ |
| 1381 | if (flags & MSG_OOB) |
| 1382 | goto recv_urg; |
| 1383 | |
| 1384 | seq = &tp->copied_seq; |
| 1385 | if (flags & MSG_PEEK) { |
| 1386 | peek_seq = tp->copied_seq; |
| 1387 | seq = &peek_seq; |
| 1388 | } |
| 1389 | |
| 1390 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 1391 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1392 | #ifdef CONFIG_NET_DMA |
| 1393 | tp->ucopy.dma_chan = NULL; |
| 1394 | preempt_disable(); |
Chris Leech | 2b1244a | 2007-03-08 09:57:36 -0800 | [diff] [blame] | 1395 | skb = skb_peek_tail(&sk->sk_receive_queue); |
Andrew Morton | e00c5d8 | 2007-03-08 09:57:36 -0800 | [diff] [blame] | 1396 | { |
| 1397 | int available = 0; |
| 1398 | |
| 1399 | if (skb) |
| 1400 | available = TCP_SKB_CB(skb)->seq + skb->len - (*seq); |
| 1401 | if ((available < target) && |
| 1402 | (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) && |
| 1403 | !sysctl_tcp_low_latency && |
Dan Williams | f67b459 | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 1404 | dma_find_channel(DMA_MEMCPY)) { |
Andrew Morton | e00c5d8 | 2007-03-08 09:57:36 -0800 | [diff] [blame] | 1405 | preempt_enable_no_resched(); |
| 1406 | tp->ucopy.pinned_list = |
| 1407 | dma_pin_iovec_pages(msg->msg_iov, len); |
| 1408 | } else { |
| 1409 | preempt_enable_no_resched(); |
| 1410 | } |
| 1411 | } |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1412 | #endif |
| 1413 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | u32 offset; |
| 1416 | |
| 1417 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ |
| 1418 | if (tp->urg_data && tp->urg_seq == *seq) { |
| 1419 | if (copied) |
| 1420 | break; |
| 1421 | if (signal_pending(current)) { |
| 1422 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
| 1423 | break; |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | /* Next get a buffer. */ |
| 1428 | |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 1429 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | /* Now that we have two receive queues this |
| 1431 | * shouldn't happen. |
| 1432 | */ |
| 1433 | if (before(*seq, TCP_SKB_CB(skb)->seq)) { |
| 1434 | printk(KERN_INFO "recvmsg bug: copied %X " |
| 1435 | "seq %X\n", *seq, TCP_SKB_CB(skb)->seq); |
| 1436 | break; |
| 1437 | } |
| 1438 | offset = *seq - TCP_SKB_CB(skb)->seq; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1439 | if (tcp_hdr(skb)->syn) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | offset--; |
| 1441 | if (offset < skb->len) |
| 1442 | goto found_ok_skb; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1443 | if (tcp_hdr(skb)->fin) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | goto found_fin_ok; |
Arjan van de Ven | c62f4c4 | 2009-10-22 21:37:56 -0700 | [diff] [blame] | 1445 | WARN(!(flags & MSG_PEEK), KERN_INFO "recvmsg bug 2: " |
| 1446 | "copied %X seq %X\n", *seq, |
| 1447 | TCP_SKB_CB(skb)->seq); |
David S. Miller | 9152194 | 2009-05-28 21:35:47 -0700 | [diff] [blame] | 1448 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | /* Well, if we have backlog, try to process it now yet. */ |
| 1451 | |
| 1452 | if (copied >= target && !sk->sk_backlog.tail) |
| 1453 | break; |
| 1454 | |
| 1455 | if (copied) { |
| 1456 | if (sk->sk_err || |
| 1457 | sk->sk_state == TCP_CLOSE || |
| 1458 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 1459 | !timeo || |
David S. Miller | 518a09e | 2008-11-05 03:36:01 -0800 | [diff] [blame] | 1460 | signal_pending(current)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | break; |
| 1462 | } else { |
| 1463 | if (sock_flag(sk, SOCK_DONE)) |
| 1464 | break; |
| 1465 | |
| 1466 | if (sk->sk_err) { |
| 1467 | copied = sock_error(sk); |
| 1468 | break; |
| 1469 | } |
| 1470 | |
| 1471 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 1472 | break; |
| 1473 | |
| 1474 | if (sk->sk_state == TCP_CLOSE) { |
| 1475 | if (!sock_flag(sk, SOCK_DONE)) { |
| 1476 | /* This occurs when user tries to read |
| 1477 | * from never connected socket. |
| 1478 | */ |
| 1479 | copied = -ENOTCONN; |
| 1480 | break; |
| 1481 | } |
| 1482 | break; |
| 1483 | } |
| 1484 | |
| 1485 | if (!timeo) { |
| 1486 | copied = -EAGAIN; |
| 1487 | break; |
| 1488 | } |
| 1489 | |
| 1490 | if (signal_pending(current)) { |
| 1491 | copied = sock_intr_errno(timeo); |
| 1492 | break; |
| 1493 | } |
| 1494 | } |
| 1495 | |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1496 | tcp_cleanup_rbuf(sk, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | |
David S. Miller | 7df5512 | 2005-06-18 23:01:10 -0700 | [diff] [blame] | 1498 | if (!sysctl_tcp_low_latency && tp->ucopy.task == user_recv) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | /* Install new reader */ |
| 1500 | if (!user_recv && !(flags & (MSG_TRUNC | MSG_PEEK))) { |
| 1501 | user_recv = current; |
| 1502 | tp->ucopy.task = user_recv; |
| 1503 | tp->ucopy.iov = msg->msg_iov; |
| 1504 | } |
| 1505 | |
| 1506 | tp->ucopy.len = len; |
| 1507 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1508 | WARN_ON(tp->copied_seq != tp->rcv_nxt && |
| 1509 | !(flags & (MSG_PEEK | MSG_TRUNC))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | |
| 1511 | /* Ugly... If prequeue is not empty, we have to |
| 1512 | * process it before releasing socket, otherwise |
| 1513 | * order will be broken at second iteration. |
| 1514 | * More elegant solution is required!!! |
| 1515 | * |
| 1516 | * Look: we have the following (pseudo)queues: |
| 1517 | * |
| 1518 | * 1. packets in flight |
| 1519 | * 2. backlog |
| 1520 | * 3. prequeue |
| 1521 | * 4. receive_queue |
| 1522 | * |
| 1523 | * Each queue can be processed only if the next ones |
| 1524 | * are empty. At this point we have empty receive_queue. |
| 1525 | * But prequeue _can_ be not empty after 2nd iteration, |
| 1526 | * when we jumped to start of loop because backlog |
| 1527 | * processing added something to receive_queue. |
| 1528 | * We cannot release_sock(), because backlog contains |
| 1529 | * packets arrived _after_ prequeued ones. |
| 1530 | * |
| 1531 | * Shortly, algorithm is clear --- to process all |
| 1532 | * the queues in order. We could make it more directly, |
| 1533 | * requeueing packets from backlog to prequeue, if |
| 1534 | * is not empty. It is more elegant, but eats cycles, |
| 1535 | * unfortunately. |
| 1536 | */ |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1537 | if (!skb_queue_empty(&tp->ucopy.prequeue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | goto do_prequeue; |
| 1539 | |
| 1540 | /* __ Set realtime policy in scheduler __ */ |
| 1541 | } |
| 1542 | |
| 1543 | if (copied >= target) { |
| 1544 | /* Do not sleep, just process backlog. */ |
| 1545 | release_sock(sk); |
| 1546 | lock_sock(sk); |
| 1547 | } else |
| 1548 | sk_wait_data(sk, &timeo); |
| 1549 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1550 | #ifdef CONFIG_NET_DMA |
| 1551 | tp->ucopy.wakeup = 0; |
| 1552 | #endif |
| 1553 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | if (user_recv) { |
| 1555 | int chunk; |
| 1556 | |
| 1557 | /* __ Restore normal policy in scheduler __ */ |
| 1558 | |
| 1559 | if ((chunk = len - tp->ucopy.len) != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1560 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | len -= chunk; |
| 1562 | copied += chunk; |
| 1563 | } |
| 1564 | |
| 1565 | if (tp->rcv_nxt == tp->copied_seq && |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1566 | !skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | do_prequeue: |
| 1568 | tcp_prequeue_process(sk); |
| 1569 | |
| 1570 | if ((chunk = len - tp->ucopy.len) != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1571 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | len -= chunk; |
| 1573 | copied += chunk; |
| 1574 | } |
| 1575 | } |
| 1576 | } |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1577 | if ((flags & MSG_PEEK) && |
| 1578 | (peek_seq - copied - urg_hole != tp->copied_seq)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | if (net_ratelimit()) |
| 1580 | printk(KERN_DEBUG "TCP(%s:%d): Application bug, race in MSG_PEEK.\n", |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 1581 | current->comm, task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | peek_seq = tp->copied_seq; |
| 1583 | } |
| 1584 | continue; |
| 1585 | |
| 1586 | found_ok_skb: |
| 1587 | /* Ok so how much can we use? */ |
| 1588 | used = skb->len - offset; |
| 1589 | if (len < used) |
| 1590 | used = len; |
| 1591 | |
| 1592 | /* Do we have urgent data here? */ |
| 1593 | if (tp->urg_data) { |
| 1594 | u32 urg_offset = tp->urg_seq - *seq; |
| 1595 | if (urg_offset < used) { |
| 1596 | if (!urg_offset) { |
| 1597 | if (!sock_flag(sk, SOCK_URGINLINE)) { |
| 1598 | ++*seq; |
Ilpo Järvinen | 7752731 | 2009-05-10 20:32:34 +0000 | [diff] [blame] | 1599 | urg_hole++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | offset++; |
| 1601 | used--; |
| 1602 | if (!used) |
| 1603 | goto skip_copy; |
| 1604 | } |
| 1605 | } else |
| 1606 | used = urg_offset; |
| 1607 | } |
| 1608 | } |
| 1609 | |
| 1610 | if (!(flags & MSG_TRUNC)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1611 | #ifdef CONFIG_NET_DMA |
| 1612 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
Dan Williams | f67b459 | 2009-01-06 11:38:15 -0700 | [diff] [blame] | 1613 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1614 | |
| 1615 | if (tp->ucopy.dma_chan) { |
| 1616 | tp->ucopy.dma_cookie = dma_skb_copy_datagram_iovec( |
| 1617 | tp->ucopy.dma_chan, skb, offset, |
| 1618 | msg->msg_iov, used, |
| 1619 | tp->ucopy.pinned_list); |
| 1620 | |
| 1621 | if (tp->ucopy.dma_cookie < 0) { |
| 1622 | |
| 1623 | printk(KERN_ALERT "dma_cookie < 0\n"); |
| 1624 | |
| 1625 | /* Exception. Bailout! */ |
| 1626 | if (!copied) |
| 1627 | copied = -EFAULT; |
| 1628 | break; |
| 1629 | } |
| 1630 | if ((offset + used) == skb->len) |
| 1631 | copied_early = 1; |
| 1632 | |
| 1633 | } else |
| 1634 | #endif |
| 1635 | { |
| 1636 | err = skb_copy_datagram_iovec(skb, offset, |
| 1637 | msg->msg_iov, used); |
| 1638 | if (err) { |
| 1639 | /* Exception. Bailout! */ |
| 1640 | if (!copied) |
| 1641 | copied = -EFAULT; |
| 1642 | break; |
| 1643 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | } |
| 1645 | } |
| 1646 | |
| 1647 | *seq += used; |
| 1648 | copied += used; |
| 1649 | len -= used; |
| 1650 | |
| 1651 | tcp_rcv_space_adjust(sk); |
| 1652 | |
| 1653 | skip_copy: |
| 1654 | if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) { |
| 1655 | tp->urg_data = 0; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 1656 | tcp_fast_path_check(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | } |
| 1658 | if (used + offset < skb->len) |
| 1659 | continue; |
| 1660 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1661 | if (tcp_hdr(skb)->fin) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | goto found_fin_ok; |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1663 | if (!(flags & MSG_PEEK)) { |
| 1664 | sk_eat_skb(sk, skb, copied_early); |
| 1665 | copied_early = 0; |
| 1666 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | continue; |
| 1668 | |
| 1669 | found_fin_ok: |
| 1670 | /* Process the FIN. */ |
| 1671 | ++*seq; |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1672 | if (!(flags & MSG_PEEK)) { |
| 1673 | sk_eat_skb(sk, skb, copied_early); |
| 1674 | copied_early = 0; |
| 1675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | break; |
| 1677 | } while (len > 0); |
| 1678 | |
| 1679 | if (user_recv) { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1680 | if (!skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | int chunk; |
| 1682 | |
| 1683 | tp->ucopy.len = copied > 0 ? len : 0; |
| 1684 | |
| 1685 | tcp_prequeue_process(sk); |
| 1686 | |
| 1687 | if (copied > 0 && (chunk = len - tp->ucopy.len) != 0) { |
Pavel Emelyanov | ed88098 | 2008-07-16 20:32:45 -0700 | [diff] [blame] | 1688 | NET_ADD_STATS_USER(sock_net(sk), LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | len -= chunk; |
| 1690 | copied += chunk; |
| 1691 | } |
| 1692 | } |
| 1693 | |
| 1694 | tp->ucopy.task = NULL; |
| 1695 | tp->ucopy.len = 0; |
| 1696 | } |
| 1697 | |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1698 | #ifdef CONFIG_NET_DMA |
| 1699 | if (tp->ucopy.dma_chan) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1700 | dma_cookie_t done, used; |
| 1701 | |
| 1702 | dma_async_memcpy_issue_pending(tp->ucopy.dma_chan); |
| 1703 | |
| 1704 | while (dma_async_memcpy_complete(tp->ucopy.dma_chan, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1705 | tp->ucopy.dma_cookie, &done, |
| 1706 | &used) == DMA_IN_PROGRESS) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1707 | /* do partial cleanup of sk_async_wait_queue */ |
| 1708 | while ((skb = skb_peek(&sk->sk_async_wait_queue)) && |
| 1709 | (dma_async_is_complete(skb->dma_cookie, done, |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1710 | used) == DMA_SUCCESS)) { |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1711 | __skb_dequeue(&sk->sk_async_wait_queue); |
| 1712 | kfree_skb(skb); |
| 1713 | } |
| 1714 | } |
| 1715 | |
| 1716 | /* Safe to free early-copied skbs now */ |
| 1717 | __skb_queue_purge(&sk->sk_async_wait_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 1718 | tp->ucopy.dma_chan = NULL; |
| 1719 | } |
| 1720 | if (tp->ucopy.pinned_list) { |
| 1721 | dma_unpin_iovec_pages(tp->ucopy.pinned_list); |
| 1722 | tp->ucopy.pinned_list = NULL; |
| 1723 | } |
| 1724 | #endif |
| 1725 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | /* According to UNIX98, msg_name/msg_namelen are ignored |
| 1727 | * on connected socket. I was just happy when found this 8) --ANK |
| 1728 | */ |
| 1729 | |
| 1730 | /* Clean up data we have read: This will do ACK frames. */ |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 1731 | tcp_cleanup_rbuf(sk, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
| 1733 | TCP_CHECK_TIMER(sk); |
| 1734 | release_sock(sk); |
| 1735 | return copied; |
| 1736 | |
| 1737 | out: |
| 1738 | TCP_CHECK_TIMER(sk); |
| 1739 | release_sock(sk); |
| 1740 | return err; |
| 1741 | |
| 1742 | recv_urg: |
Rami Rosen | 377f0a0 | 2009-03-31 14:43:17 -0700 | [diff] [blame] | 1743 | err = tcp_recv_urg(sk, msg, len, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | goto out; |
| 1745 | } |
| 1746 | |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1747 | void tcp_set_state(struct sock *sk, int state) |
| 1748 | { |
| 1749 | int oldstate = sk->sk_state; |
| 1750 | |
| 1751 | switch (state) { |
| 1752 | case TCP_ESTABLISHED: |
| 1753 | if (oldstate != TCP_ESTABLISHED) |
Pavel Emelyanov | 81cc8a7 | 2008-07-16 20:22:04 -0700 | [diff] [blame] | 1754 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1755 | break; |
| 1756 | |
| 1757 | case TCP_CLOSE: |
| 1758 | if (oldstate == TCP_CLOSE_WAIT || oldstate == TCP_ESTABLISHED) |
Pavel Emelyanov | 81cc8a7 | 2008-07-16 20:22:04 -0700 | [diff] [blame] | 1759 | TCP_INC_STATS(sock_net(sk), TCP_MIB_ESTABRESETS); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1760 | |
| 1761 | sk->sk_prot->unhash(sk); |
| 1762 | if (inet_csk(sk)->icsk_bind_hash && |
| 1763 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 1764 | inet_put_port(sk); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1765 | /* fall through */ |
| 1766 | default: |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 1767 | if (oldstate == TCP_ESTABLISHED) |
Pavel Emelyanov | 74688e4 | 2008-07-16 20:22:46 -0700 | [diff] [blame] | 1768 | TCP_DEC_STATS(sock_net(sk), TCP_MIB_CURRESTAB); |
Ilpo Järvinen | 490d504 | 2008-01-12 03:17:20 -0800 | [diff] [blame] | 1769 | } |
| 1770 | |
| 1771 | /* Change state AFTER socket is unhashed to avoid closed |
| 1772 | * socket sitting in hash tables. |
| 1773 | */ |
| 1774 | sk->sk_state = state; |
| 1775 | |
| 1776 | #ifdef STATE_TRACE |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 1777 | 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] | 1778 | #endif |
| 1779 | } |
| 1780 | EXPORT_SYMBOL_GPL(tcp_set_state); |
| 1781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | /* |
| 1783 | * State processing on a close. This implements the state shift for |
| 1784 | * sending our FIN frame. Note that we only send a FIN for some |
| 1785 | * states. A shutdown() may have already sent the FIN, or we may be |
| 1786 | * closed. |
| 1787 | */ |
| 1788 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1789 | static const unsigned char new_state[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | /* current state: new state: action: */ |
| 1791 | /* (Invalid) */ TCP_CLOSE, |
| 1792 | /* TCP_ESTABLISHED */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1793 | /* TCP_SYN_SENT */ TCP_CLOSE, |
| 1794 | /* TCP_SYN_RECV */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1795 | /* TCP_FIN_WAIT1 */ TCP_FIN_WAIT1, |
| 1796 | /* TCP_FIN_WAIT2 */ TCP_FIN_WAIT2, |
| 1797 | /* TCP_TIME_WAIT */ TCP_CLOSE, |
| 1798 | /* TCP_CLOSE */ TCP_CLOSE, |
| 1799 | /* TCP_CLOSE_WAIT */ TCP_LAST_ACK | TCP_ACTION_FIN, |
| 1800 | /* TCP_LAST_ACK */ TCP_LAST_ACK, |
| 1801 | /* TCP_LISTEN */ TCP_CLOSE, |
| 1802 | /* TCP_CLOSING */ TCP_CLOSING, |
| 1803 | }; |
| 1804 | |
| 1805 | static int tcp_close_state(struct sock *sk) |
| 1806 | { |
| 1807 | int next = (int)new_state[sk->sk_state]; |
| 1808 | int ns = next & TCP_STATE_MASK; |
| 1809 | |
| 1810 | tcp_set_state(sk, ns); |
| 1811 | |
| 1812 | return next & TCP_ACTION_FIN; |
| 1813 | } |
| 1814 | |
| 1815 | /* |
| 1816 | * Shutdown the sending side of a connection. Much like close except |
Satoru SATOH | 1f29b05 | 2008-04-21 02:27:58 -0700 | [diff] [blame] | 1817 | * 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] | 1818 | */ |
| 1819 | |
| 1820 | void tcp_shutdown(struct sock *sk, int how) |
| 1821 | { |
| 1822 | /* We need to grab some memory, and put together a FIN, |
| 1823 | * and then put it into the queue to be sent. |
| 1824 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. |
| 1825 | */ |
| 1826 | if (!(how & SEND_SHUTDOWN)) |
| 1827 | return; |
| 1828 | |
| 1829 | /* If we've already sent a FIN, or it's a closed state, skip this. */ |
| 1830 | if ((1 << sk->sk_state) & |
| 1831 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | |
| 1832 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { |
| 1833 | /* Clear out any half completed packets. FIN if needed. */ |
| 1834 | if (tcp_close_state(sk)) |
| 1835 | tcp_send_fin(sk); |
| 1836 | } |
| 1837 | } |
| 1838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | void tcp_close(struct sock *sk, long timeout) |
| 1840 | { |
| 1841 | struct sk_buff *skb; |
| 1842 | int data_was_unread = 0; |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1843 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | |
| 1845 | lock_sock(sk); |
| 1846 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 1847 | |
| 1848 | if (sk->sk_state == TCP_LISTEN) { |
| 1849 | tcp_set_state(sk, TCP_CLOSE); |
| 1850 | |
| 1851 | /* Special case. */ |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1852 | inet_csk_listen_stop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | |
| 1854 | goto adjudge_to_death; |
| 1855 | } |
| 1856 | |
| 1857 | /* We need to flush the recv. buffs. We do this only on the |
| 1858 | * descriptor close, not protocol-sourced closes, because the |
| 1859 | * reader process may not have drained the data yet! |
| 1860 | */ |
| 1861 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 1862 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq - |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 1863 | tcp_hdr(skb)->fin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | data_was_unread += len; |
| 1865 | __kfree_skb(skb); |
| 1866 | } |
| 1867 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1868 | sk_mem_reclaim(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
Gerrit Renker | 65bb723 | 2007-04-28 21:21:46 -0700 | [diff] [blame] | 1870 | /* As outlined in RFC 2525, section 2.17, we send a RST here because |
| 1871 | * data was lost. To witness the awful effects of the old behavior of |
| 1872 | * always doing a FIN, run an older 2.1.x kernel or 2.0.x, start a bulk |
| 1873 | * GET in an FTP client, suspend the process, wait for the client to |
| 1874 | * advertise a zero window, then kill -9 the FTP client, wheee... |
| 1875 | * Note: timeout is always zero in such a case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | */ |
| 1877 | if (data_was_unread) { |
| 1878 | /* Unread data was tossed, zap the connection. */ |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 1879 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONCLOSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | tcp_set_state(sk, TCP_CLOSE); |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 1881 | tcp_send_active_reset(sk, sk->sk_allocation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
| 1883 | /* Check zero linger _after_ checking for unread data. */ |
| 1884 | sk->sk_prot->disconnect(sk, 0); |
Pavel Emelyanov | 6f67c81 | 2008-07-16 20:31:39 -0700 | [diff] [blame] | 1885 | NET_INC_STATS_USER(sock_net(sk), LINUX_MIB_TCPABORTONDATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | } else if (tcp_close_state(sk)) { |
| 1887 | /* We FIN if the application ate all the data before |
| 1888 | * zapping the connection. |
| 1889 | */ |
| 1890 | |
| 1891 | /* RED-PEN. Formally speaking, we have broken TCP state |
| 1892 | * machine. State transitions: |
| 1893 | * |
| 1894 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 |
| 1895 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) |
| 1896 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK |
| 1897 | * |
| 1898 | * are legal only when FIN has been sent (i.e. in window), |
| 1899 | * rather than queued out of window. Purists blame. |
| 1900 | * |
| 1901 | * F.e. "RFC state" is ESTABLISHED, |
| 1902 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. |
| 1903 | * |
| 1904 | * The visible declinations are that sometimes |
| 1905 | * we enter time-wait state, when it is not required really |
| 1906 | * (harmless), do not send active resets, when they are |
| 1907 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when |
| 1908 | * they look as CLOSING or LAST_ACK for Linux) |
| 1909 | * Probably, I missed some more holelets. |
| 1910 | * --ANK |
| 1911 | */ |
| 1912 | tcp_send_fin(sk); |
| 1913 | } |
| 1914 | |
| 1915 | sk_stream_wait_close(sk, timeout); |
| 1916 | |
| 1917 | adjudge_to_death: |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1918 | state = sk->sk_state; |
| 1919 | sock_hold(sk); |
| 1920 | sock_orphan(sk); |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | /* It is the last release_sock in its life. It will remove backlog. */ |
| 1923 | release_sock(sk); |
| 1924 | |
| 1925 | |
| 1926 | /* Now socket is owned by kernel and we acquire BH lock |
| 1927 | to finish close. No need to check for user refs. |
| 1928 | */ |
| 1929 | local_bh_disable(); |
| 1930 | bh_lock_sock(sk); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 1931 | WARN_ON(sock_owned_by_user(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 1933 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 1934 | |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1935 | /* Have we already been destroyed by a softirq or backlog? */ |
| 1936 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) |
| 1937 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | |
| 1939 | /* This is a (useful) BSD violating of the RFC. There is a |
| 1940 | * problem with TCP as specified in that the other end could |
| 1941 | * keep a socket open forever with no application left this end. |
| 1942 | * We use a 3 minute timeout (about the same as BSD) then kill |
| 1943 | * our end. If they send after that then tough - BUT: long enough |
| 1944 | * that we won't make the old 4*rto = almost no time - whoops |
| 1945 | * reset mistake. |
| 1946 | * |
| 1947 | * Nope, it was not mistake. It is really desired behaviour |
| 1948 | * f.e. on http servers, when such sockets are useless, but |
| 1949 | * consume significant resources. Let's do it with special |
| 1950 | * linger2 option. --ANK |
| 1951 | */ |
| 1952 | |
| 1953 | if (sk->sk_state == TCP_FIN_WAIT2) { |
| 1954 | struct tcp_sock *tp = tcp_sk(sk); |
| 1955 | if (tp->linger2 < 0) { |
| 1956 | tcp_set_state(sk, TCP_CLOSE); |
| 1957 | tcp_send_active_reset(sk, GFP_ATOMIC); |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1958 | NET_INC_STATS_BH(sock_net(sk), |
| 1959 | LINUX_MIB_TCPABORTONLINGER); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1961 | const int tmo = tcp_fin_time(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | |
| 1963 | if (tmo > TCP_TIMEWAIT_LEN) { |
David S. Miller | 52499af | 2006-07-31 22:32:09 -0700 | [diff] [blame] | 1964 | inet_csk_reset_keepalive_timer(sk, |
| 1965 | tmo - TCP_TIMEWAIT_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
| 1968 | goto out; |
| 1969 | } |
| 1970 | } |
| 1971 | } |
| 1972 | if (sk->sk_state != TCP_CLOSE) { |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1973 | int orphan_count = percpu_counter_read_positive( |
| 1974 | sk->sk_prot->orphan_count); |
| 1975 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 1976 | sk_mem_reclaim(sk); |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 1977 | if (tcp_too_many_orphans(sk, orphan_count)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | if (net_ratelimit()) |
| 1979 | printk(KERN_INFO "TCP: too many of orphaned " |
| 1980 | "sockets\n"); |
| 1981 | tcp_set_state(sk, TCP_CLOSE); |
| 1982 | tcp_send_active_reset(sk, GFP_ATOMIC); |
Pavel Emelyanov | de0744a | 2008-07-16 20:31:16 -0700 | [diff] [blame] | 1983 | NET_INC_STATS_BH(sock_net(sk), |
| 1984 | LINUX_MIB_TCPABORTONMEMORY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | } |
| 1986 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | |
| 1988 | if (sk->sk_state == TCP_CLOSE) |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1989 | inet_csk_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | /* Otherwise, socket is reprieved until protocol close. */ |
| 1991 | |
| 1992 | out: |
| 1993 | bh_unlock_sock(sk); |
| 1994 | local_bh_enable(); |
| 1995 | sock_put(sk); |
| 1996 | } |
| 1997 | |
| 1998 | /* These states need RST on ABORT according to RFC793 */ |
| 1999 | |
| 2000 | static inline int tcp_need_reset(int state) |
| 2001 | { |
| 2002 | return (1 << state) & |
| 2003 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | |
| 2004 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); |
| 2005 | } |
| 2006 | |
| 2007 | int tcp_disconnect(struct sock *sk, int flags) |
| 2008 | { |
| 2009 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2010 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | struct tcp_sock *tp = tcp_sk(sk); |
| 2012 | int err = 0; |
| 2013 | int old_state = sk->sk_state; |
| 2014 | |
| 2015 | if (old_state != TCP_CLOSE) |
| 2016 | tcp_set_state(sk, TCP_CLOSE); |
| 2017 | |
| 2018 | /* ABORT function of RFC793 */ |
| 2019 | if (old_state == TCP_LISTEN) { |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 2020 | inet_csk_listen_stop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | } else if (tcp_need_reset(old_state) || |
| 2022 | (tp->snd_nxt != tp->write_seq && |
| 2023 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 2024 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | * states |
| 2026 | */ |
| 2027 | tcp_send_active_reset(sk, gfp_any()); |
| 2028 | sk->sk_err = ECONNRESET; |
| 2029 | } else if (old_state == TCP_SYN_SENT) |
| 2030 | sk->sk_err = ECONNRESET; |
| 2031 | |
| 2032 | tcp_clear_xmit_timers(sk); |
| 2033 | __skb_queue_purge(&sk->sk_receive_queue); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2034 | tcp_write_queue_purge(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | __skb_queue_purge(&tp->out_of_order_queue); |
Chris Leech | 1a2449a | 2006-05-23 18:05:53 -0700 | [diff] [blame] | 2036 | #ifdef CONFIG_NET_DMA |
| 2037 | __skb_queue_purge(&sk->sk_async_wait_queue); |
| 2038 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | |
| 2040 | inet->dport = 0; |
| 2041 | |
| 2042 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 2043 | inet_reset_saddr(sk); |
| 2044 | |
| 2045 | sk->sk_shutdown = 0; |
| 2046 | sock_reset_flag(sk, SOCK_DONE); |
| 2047 | tp->srtt = 0; |
| 2048 | if ((tp->write_seq += tp->max_window + 2) == 0) |
| 2049 | tp->write_seq = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2050 | icsk->icsk_backoff = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | tp->snd_cwnd = 2; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2052 | icsk->icsk_probes_out = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2053 | tp->packets_out = 0; |
Ilpo Järvinen | 0b6a05c | 2009-09-15 01:30:10 -0700 | [diff] [blame] | 2054 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | tp->snd_cwnd_cnt = 0; |
Stephen Hemminger | 9772efb | 2005-11-10 17:09:53 -0800 | [diff] [blame] | 2056 | tp->bytes_acked = 0; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2057 | tcp_set_ca_state(sk, TCP_CA_Open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | tcp_clear_retrans(tp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2059 | inet_csk_delack_init(sk); |
David S. Miller | fe067e8 | 2007-03-07 12:12:44 -0800 | [diff] [blame] | 2060 | tcp_init_send_head(sk); |
Srinivas Aji | b40b4f7 | 2007-05-03 17:32:28 -0700 | [diff] [blame] | 2061 | memset(&tp->rx_opt, 0, sizeof(tp->rx_opt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | __sk_dst_reset(sk); |
| 2063 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 2064 | WARN_ON(inet->num && !icsk->icsk_bind_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | |
| 2066 | sk->sk_error_report(sk); |
| 2067 | return err; |
| 2068 | } |
| 2069 | |
| 2070 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | * Socket option code for TCP. |
| 2072 | */ |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2073 | static int do_tcp_setsockopt(struct sock *sk, int level, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2074 | int optname, char __user *optval, unsigned int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | { |
| 2076 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2077 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | int val; |
| 2079 | int err = 0; |
| 2080 | |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2081 | /* This is a string value all the others are int's */ |
| 2082 | if (optname == TCP_CONGESTION) { |
| 2083 | char name[TCP_CA_NAME_MAX]; |
| 2084 | |
| 2085 | if (optlen < 1) |
| 2086 | return -EINVAL; |
| 2087 | |
| 2088 | val = strncpy_from_user(name, optval, |
Andrew Morton | 4fdb78d | 2009-10-01 15:02:20 -0700 | [diff] [blame] | 2089 | min_t(long, TCP_CA_NAME_MAX-1, optlen)); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2090 | if (val < 0) |
| 2091 | return -EFAULT; |
| 2092 | name[val] = 0; |
| 2093 | |
| 2094 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2095 | err = tcp_set_congestion_control(sk, name); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2096 | release_sock(sk); |
| 2097 | return err; |
| 2098 | } |
| 2099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2100 | if (optlen < sizeof(int)) |
| 2101 | return -EINVAL; |
| 2102 | |
| 2103 | if (get_user(val, (int __user *)optval)) |
| 2104 | return -EFAULT; |
| 2105 | |
| 2106 | lock_sock(sk); |
| 2107 | |
| 2108 | switch (optname) { |
| 2109 | case TCP_MAXSEG: |
| 2110 | /* Values greater than interface MTU won't take effect. However |
| 2111 | * at the point when this call is done we typically don't yet |
| 2112 | * know which interface is going to be used */ |
| 2113 | if (val < 8 || val > MAX_TCP_WINDOW) { |
| 2114 | err = -EINVAL; |
| 2115 | break; |
| 2116 | } |
| 2117 | tp->rx_opt.user_mss = val; |
| 2118 | break; |
| 2119 | |
| 2120 | case TCP_NODELAY: |
| 2121 | if (val) { |
| 2122 | /* TCP_NODELAY is weaker than TCP_CORK, so that |
| 2123 | * this option on corked socket is remembered, but |
| 2124 | * it is not activated until cork is cleared. |
| 2125 | * |
| 2126 | * However, when TCP_NODELAY is set we make |
| 2127 | * an explicit push, which overrides even TCP_CORK |
| 2128 | * for currently queued segments. |
| 2129 | */ |
| 2130 | tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 2131 | tcp_push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | } else { |
| 2133 | tp->nonagle &= ~TCP_NAGLE_OFF; |
| 2134 | } |
| 2135 | break; |
| 2136 | |
| 2137 | case TCP_CORK: |
| 2138 | /* When set indicates to always queue non-full frames. |
| 2139 | * Later the user clears this option and we transmit |
| 2140 | * any pending partial frames in the queue. This is |
| 2141 | * meant to be used alongside sendfile() to get properly |
| 2142 | * filled frames when the user (for example) must write |
| 2143 | * out headers with a write() call first and then use |
| 2144 | * sendfile to send out the data parts. |
| 2145 | * |
| 2146 | * TCP_CORK can be set together with TCP_NODELAY and it is |
| 2147 | * stronger than TCP_NODELAY. |
| 2148 | */ |
| 2149 | if (val) { |
| 2150 | tp->nonagle |= TCP_NAGLE_CORK; |
| 2151 | } else { |
| 2152 | tp->nonagle &= ~TCP_NAGLE_CORK; |
| 2153 | if (tp->nonagle&TCP_NAGLE_OFF) |
| 2154 | tp->nonagle |= TCP_NAGLE_PUSH; |
Ilpo Järvinen | 9e412ba | 2007-04-20 22:18:02 -0700 | [diff] [blame] | 2155 | tcp_push_pending_frames(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | } |
| 2157 | break; |
| 2158 | |
| 2159 | case TCP_KEEPIDLE: |
| 2160 | if (val < 1 || val > MAX_TCP_KEEPIDLE) |
| 2161 | err = -EINVAL; |
| 2162 | else { |
| 2163 | tp->keepalive_time = val * HZ; |
| 2164 | if (sock_flag(sk, SOCK_KEEPOPEN) && |
| 2165 | !((1 << sk->sk_state) & |
| 2166 | (TCPF_CLOSE | TCPF_LISTEN))) { |
| 2167 | __u32 elapsed = tcp_time_stamp - tp->rcv_tstamp; |
| 2168 | if (tp->keepalive_time > elapsed) |
| 2169 | elapsed = tp->keepalive_time - elapsed; |
| 2170 | else |
| 2171 | elapsed = 0; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2172 | inet_csk_reset_keepalive_timer(sk, elapsed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | } |
| 2174 | } |
| 2175 | break; |
| 2176 | case TCP_KEEPINTVL: |
| 2177 | if (val < 1 || val > MAX_TCP_KEEPINTVL) |
| 2178 | err = -EINVAL; |
| 2179 | else |
| 2180 | tp->keepalive_intvl = val * HZ; |
| 2181 | break; |
| 2182 | case TCP_KEEPCNT: |
| 2183 | if (val < 1 || val > MAX_TCP_KEEPCNT) |
| 2184 | err = -EINVAL; |
| 2185 | else |
| 2186 | tp->keepalive_probes = val; |
| 2187 | break; |
| 2188 | case TCP_SYNCNT: |
| 2189 | if (val < 1 || val > MAX_TCP_SYNCNT) |
| 2190 | err = -EINVAL; |
| 2191 | else |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2192 | icsk->icsk_syn_retries = val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | break; |
| 2194 | |
| 2195 | case TCP_LINGER2: |
| 2196 | if (val < 0) |
| 2197 | tp->linger2 = -1; |
| 2198 | else if (val > sysctl_tcp_fin_timeout / HZ) |
| 2199 | tp->linger2 = 0; |
| 2200 | else |
| 2201 | tp->linger2 = val * HZ; |
| 2202 | break; |
| 2203 | |
| 2204 | case TCP_DEFER_ACCEPT: |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 2205 | /* Translate value in seconds to number of retransmits */ |
| 2206 | icsk->icsk_accept_queue.rskq_defer_accept = |
| 2207 | secs_to_retrans(val, TCP_TIMEOUT_INIT / HZ, |
| 2208 | TCP_RTO_MAX / HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | break; |
| 2210 | |
| 2211 | case TCP_WINDOW_CLAMP: |
| 2212 | if (!val) { |
| 2213 | if (sk->sk_state != TCP_CLOSE) { |
| 2214 | err = -EINVAL; |
| 2215 | break; |
| 2216 | } |
| 2217 | tp->window_clamp = 0; |
| 2218 | } else |
| 2219 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? |
| 2220 | SOCK_MIN_RCVBUF / 2 : val; |
| 2221 | break; |
| 2222 | |
| 2223 | case TCP_QUICKACK: |
| 2224 | if (!val) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2225 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2227 | icsk->icsk_ack.pingpong = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | if ((1 << sk->sk_state) & |
| 2229 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2230 | inet_csk_ack_scheduled(sk)) { |
| 2231 | icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; |
Chris Leech | 0e4b499 | 2006-05-23 18:00:16 -0700 | [diff] [blame] | 2232 | tcp_cleanup_rbuf(sk, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | if (!(val & 1)) |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2234 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | } |
| 2236 | } |
| 2237 | break; |
| 2238 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2239 | #ifdef CONFIG_TCP_MD5SIG |
| 2240 | case TCP_MD5SIG: |
| 2241 | /* Read the IP->Key mappings from userspace */ |
| 2242 | err = tp->af_specific->md5_parse(sk, optval, optlen); |
| 2243 | break; |
| 2244 | #endif |
| 2245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | default: |
| 2247 | err = -ENOPROTOOPT; |
| 2248 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2249 | } |
| 2250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | release_sock(sk); |
| 2252 | return err; |
| 2253 | } |
| 2254 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2255 | 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] | 2256 | unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2257 | { |
| 2258 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 2259 | |
| 2260 | if (level != SOL_TCP) |
| 2261 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, |
| 2262 | optval, optlen); |
| 2263 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 2264 | } |
| 2265 | |
| 2266 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2267 | int compat_tcp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2268 | char __user *optval, unsigned int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2269 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 2270 | if (level != SOL_TCP) |
| 2271 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 2272 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2273 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 2274 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2275 | |
| 2276 | EXPORT_SYMBOL(compat_tcp_setsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2277 | #endif |
| 2278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | /* Return information about state of tcp endpoint in API format. */ |
| 2280 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
| 2281 | { |
| 2282 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2283 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | u32 now = tcp_time_stamp; |
| 2285 | |
| 2286 | memset(info, 0, sizeof(*info)); |
| 2287 | |
| 2288 | info->tcpi_state = sk->sk_state; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2289 | info->tcpi_ca_state = icsk->icsk_ca_state; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2290 | info->tcpi_retransmits = icsk->icsk_retransmits; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2291 | info->tcpi_probes = icsk->icsk_probes_out; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2292 | info->tcpi_backoff = icsk->icsk_backoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | |
| 2294 | if (tp->rx_opt.tstamp_ok) |
| 2295 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
Ilpo Järvinen | e60402d | 2007-08-09 15:14:46 +0300 | [diff] [blame] | 2296 | if (tcp_is_sack(tp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | info->tcpi_options |= TCPI_OPT_SACK; |
| 2298 | if (tp->rx_opt.wscale_ok) { |
| 2299 | info->tcpi_options |= TCPI_OPT_WSCALE; |
| 2300 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; |
| 2301 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 2302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | |
| 2304 | if (tp->ecn_flags&TCP_ECN_OK) |
| 2305 | info->tcpi_options |= TCPI_OPT_ECN; |
| 2306 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2307 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
| 2308 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 2309 | info->tcpi_snd_mss = tp->mss_cache; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 2310 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | |
Rick Jones | 5ee3afb | 2007-09-18 13:26:31 -0700 | [diff] [blame] | 2312 | if (sk->sk_state == TCP_LISTEN) { |
| 2313 | info->tcpi_unacked = sk->sk_ack_backlog; |
| 2314 | info->tcpi_sacked = sk->sk_max_ack_backlog; |
| 2315 | } else { |
| 2316 | info->tcpi_unacked = tp->packets_out; |
| 2317 | info->tcpi_sacked = tp->sacked_out; |
| 2318 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | info->tcpi_lost = tp->lost_out; |
| 2320 | info->tcpi_retrans = tp->retrans_out; |
| 2321 | info->tcpi_fackets = tp->fackets_out; |
| 2322 | |
| 2323 | 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] | 2324 | 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] | 2325 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
| 2326 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 2327 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
| 2329 | info->tcpi_rtt = jiffies_to_usecs(tp->srtt)>>3; |
| 2330 | info->tcpi_rttvar = jiffies_to_usecs(tp->mdev)>>2; |
| 2331 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
| 2332 | info->tcpi_snd_cwnd = tp->snd_cwnd; |
| 2333 | info->tcpi_advmss = tp->advmss; |
| 2334 | info->tcpi_reordering = tp->reordering; |
| 2335 | |
| 2336 | info->tcpi_rcv_rtt = jiffies_to_usecs(tp->rcv_rtt_est.rtt)>>3; |
| 2337 | info->tcpi_rcv_space = tp->rcvq_space.space; |
| 2338 | |
| 2339 | info->tcpi_total_retrans = tp->total_retrans; |
| 2340 | } |
| 2341 | |
| 2342 | EXPORT_SYMBOL_GPL(tcp_get_info); |
| 2343 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2344 | static int do_tcp_getsockopt(struct sock *sk, int level, |
| 2345 | int optname, char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | { |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2347 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2348 | struct tcp_sock *tp = tcp_sk(sk); |
| 2349 | int val, len; |
| 2350 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | if (get_user(len, optlen)) |
| 2352 | return -EFAULT; |
| 2353 | |
| 2354 | len = min_t(unsigned int, len, sizeof(int)); |
| 2355 | |
| 2356 | if (len < 0) |
| 2357 | return -EINVAL; |
| 2358 | |
| 2359 | switch (optname) { |
| 2360 | case TCP_MAXSEG: |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 2361 | val = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2362 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
| 2363 | val = tp->rx_opt.user_mss; |
| 2364 | break; |
| 2365 | case TCP_NODELAY: |
| 2366 | val = !!(tp->nonagle&TCP_NAGLE_OFF); |
| 2367 | break; |
| 2368 | case TCP_CORK: |
| 2369 | val = !!(tp->nonagle&TCP_NAGLE_CORK); |
| 2370 | break; |
| 2371 | case TCP_KEEPIDLE: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2372 | val = keepalive_time_when(tp) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | break; |
| 2374 | case TCP_KEEPINTVL: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2375 | val = keepalive_intvl_when(tp) / HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2376 | break; |
| 2377 | case TCP_KEEPCNT: |
Eric Dumazet | df19a62 | 2009-08-28 23:48:54 -0700 | [diff] [blame] | 2378 | val = keepalive_probes(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | break; |
| 2380 | case TCP_SYNCNT: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2381 | val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | break; |
| 2383 | case TCP_LINGER2: |
| 2384 | val = tp->linger2; |
| 2385 | if (val >= 0) |
| 2386 | val = (val ? : sysctl_tcp_fin_timeout) / HZ; |
| 2387 | break; |
| 2388 | case TCP_DEFER_ACCEPT: |
Julian Anastasov | b103cf3 | 2009-10-19 10:10:40 +0000 | [diff] [blame] | 2389 | val = retrans_to_secs(icsk->icsk_accept_queue.rskq_defer_accept, |
| 2390 | TCP_TIMEOUT_INIT / HZ, TCP_RTO_MAX / HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | break; |
| 2392 | case TCP_WINDOW_CLAMP: |
| 2393 | val = tp->window_clamp; |
| 2394 | break; |
| 2395 | case TCP_INFO: { |
| 2396 | struct tcp_info info; |
| 2397 | |
| 2398 | if (get_user(len, optlen)) |
| 2399 | return -EFAULT; |
| 2400 | |
| 2401 | tcp_get_info(sk, &info); |
| 2402 | |
| 2403 | len = min_t(unsigned int, len, sizeof(info)); |
| 2404 | if (put_user(len, optlen)) |
| 2405 | return -EFAULT; |
| 2406 | if (copy_to_user(optval, &info, len)) |
| 2407 | return -EFAULT; |
| 2408 | return 0; |
| 2409 | } |
| 2410 | case TCP_QUICKACK: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2411 | val = !icsk->icsk_ack.pingpong; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | break; |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2413 | |
| 2414 | case TCP_CONGESTION: |
| 2415 | if (get_user(len, optlen)) |
| 2416 | return -EFAULT; |
| 2417 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); |
| 2418 | if (put_user(len, optlen)) |
| 2419 | return -EFAULT; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2420 | if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2421 | return -EFAULT; |
| 2422 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2423 | default: |
| 2424 | return -ENOPROTOOPT; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 2425 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | |
| 2427 | if (put_user(len, optlen)) |
| 2428 | return -EFAULT; |
| 2429 | if (copy_to_user(optval, &val, len)) |
| 2430 | return -EFAULT; |
| 2431 | return 0; |
| 2432 | } |
| 2433 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2434 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 2435 | int __user *optlen) |
| 2436 | { |
| 2437 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 2438 | |
| 2439 | if (level != SOL_TCP) |
| 2440 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, |
| 2441 | optval, optlen); |
| 2442 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2443 | } |
| 2444 | |
| 2445 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2446 | int compat_tcp_getsockopt(struct sock *sk, int level, int optname, |
| 2447 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2448 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 2449 | if (level != SOL_TCP) |
| 2450 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 2451 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2452 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2453 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2454 | |
| 2455 | EXPORT_SYMBOL(compat_tcp_getsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2456 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2458 | struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features) |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2459 | { |
| 2460 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
| 2461 | struct tcphdr *th; |
| 2462 | unsigned thlen; |
| 2463 | unsigned int seq; |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 2464 | __be32 delta; |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2465 | unsigned int oldlen; |
Herbert Xu | 4e704ee | 2009-01-14 20:41:12 -0800 | [diff] [blame] | 2466 | unsigned int mss; |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2467 | |
| 2468 | if (!pskb_may_pull(skb, sizeof(*th))) |
| 2469 | goto out; |
| 2470 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 2471 | th = tcp_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2472 | thlen = th->doff * 4; |
| 2473 | if (thlen < sizeof(*th)) |
| 2474 | goto out; |
| 2475 | |
| 2476 | if (!pskb_may_pull(skb, thlen)) |
| 2477 | goto out; |
| 2478 | |
Herbert Xu | 0718bcc | 2006-06-25 23:55:46 -0700 | [diff] [blame] | 2479 | oldlen = (u16)~skb->len; |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2480 | __skb_pull(skb, thlen); |
| 2481 | |
Herbert Xu | 4e704ee | 2009-01-14 20:41:12 -0800 | [diff] [blame] | 2482 | mss = skb_shinfo(skb)->gso_size; |
| 2483 | if (unlikely(skb->len <= mss)) |
| 2484 | goto out; |
| 2485 | |
Herbert Xu | 3820c3f | 2006-06-29 20:11:25 -0700 | [diff] [blame] | 2486 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { |
| 2487 | /* Packet is from an untrusted source, reset gso_segs. */ |
Herbert Xu | bbcf467 | 2006-07-03 19:38:35 -0700 | [diff] [blame] | 2488 | int type = skb_shinfo(skb)->gso_type; |
Herbert Xu | 3820c3f | 2006-06-29 20:11:25 -0700 | [diff] [blame] | 2489 | |
Herbert Xu | bbcf467 | 2006-07-03 19:38:35 -0700 | [diff] [blame] | 2490 | if (unlikely(type & |
| 2491 | ~(SKB_GSO_TCPV4 | |
| 2492 | SKB_GSO_DODGY | |
| 2493 | SKB_GSO_TCP_ECN | |
| 2494 | SKB_GSO_TCPV6 | |
| 2495 | 0) || |
| 2496 | !(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))) |
| 2497 | goto out; |
| 2498 | |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 2499 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); |
Herbert Xu | 3820c3f | 2006-06-29 20:11:25 -0700 | [diff] [blame] | 2500 | |
| 2501 | segs = NULL; |
| 2502 | goto out; |
| 2503 | } |
| 2504 | |
Herbert Xu | 576a30e | 2006-06-27 13:22:38 -0700 | [diff] [blame] | 2505 | segs = skb_segment(skb, features); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2506 | if (IS_ERR(segs)) |
| 2507 | goto out; |
| 2508 | |
Herbert Xu | 4e704ee | 2009-01-14 20:41:12 -0800 | [diff] [blame] | 2509 | delta = htonl(oldlen + (thlen + mss)); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2510 | |
| 2511 | skb = segs; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 2512 | th = tcp_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2513 | seq = ntohl(th->seq); |
| 2514 | |
| 2515 | do { |
| 2516 | th->fin = th->psh = 0; |
| 2517 | |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 2518 | th->check = ~csum_fold((__force __wsum)((__force u32)th->check + |
| 2519 | (__force u32)delta)); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 2520 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 2521 | th->check = |
| 2522 | csum_fold(csum_partial(skb_transport_header(skb), |
| 2523 | thlen, skb->csum)); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2524 | |
Herbert Xu | 4e704ee | 2009-01-14 20:41:12 -0800 | [diff] [blame] | 2525 | seq += mss; |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2526 | skb = skb->next; |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 2527 | th = tcp_hdr(skb); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2528 | |
| 2529 | th->seq = htonl(seq); |
| 2530 | th->cwr = 0; |
| 2531 | } while (skb->next); |
| 2532 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 2533 | delta = htonl(oldlen + (skb->tail - skb->transport_header) + |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 2534 | skb->data_len); |
Al Viro | d3bc23e | 2006-11-14 21:24:49 -0800 | [diff] [blame] | 2535 | th->check = ~csum_fold((__force __wsum)((__force u32)th->check + |
| 2536 | (__force u32)delta)); |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 2537 | if (skb->ip_summed != CHECKSUM_PARTIAL) |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 2538 | th->check = csum_fold(csum_partial(skb_transport_header(skb), |
| 2539 | thlen, skb->csum)); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2540 | |
| 2541 | out: |
| 2542 | return segs; |
| 2543 | } |
Herbert Xu | adcfc7d | 2006-06-30 13:36:15 -0700 | [diff] [blame] | 2544 | EXPORT_SYMBOL(tcp_tso_segment); |
Herbert Xu | f4c50d9 | 2006-06-22 03:02:40 -0700 | [diff] [blame] | 2545 | |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2546 | struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb) |
| 2547 | { |
| 2548 | struct sk_buff **pp = NULL; |
| 2549 | struct sk_buff *p; |
| 2550 | struct tcphdr *th; |
| 2551 | struct tcphdr *th2; |
Herbert Xu | a0a69a0 | 2009-04-17 02:34:38 -0700 | [diff] [blame] | 2552 | unsigned int len; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2553 | unsigned int thlen; |
| 2554 | unsigned int flags; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2555 | unsigned int mss = 1; |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 2556 | unsigned int hlen; |
| 2557 | unsigned int off; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2558 | int flush = 1; |
Herbert Xu | aa6320d | 2009-02-08 18:00:40 +0000 | [diff] [blame] | 2559 | int i; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2560 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 2561 | off = skb_gro_offset(skb); |
| 2562 | hlen = off + sizeof(*th); |
| 2563 | th = skb_gro_header_fast(skb, off); |
| 2564 | if (skb_gro_header_hard(skb, hlen)) { |
| 2565 | th = skb_gro_header_slow(skb, hlen, off); |
| 2566 | if (unlikely(!th)) |
| 2567 | goto out; |
| 2568 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2569 | |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2570 | thlen = th->doff * 4; |
| 2571 | if (thlen < sizeof(*th)) |
| 2572 | goto out; |
| 2573 | |
Herbert Xu | a5b1cf2 | 2009-05-26 18:50:28 +0000 | [diff] [blame] | 2574 | hlen = off + thlen; |
| 2575 | if (skb_gro_header_hard(skb, hlen)) { |
| 2576 | th = skb_gro_header_slow(skb, hlen, off); |
| 2577 | if (unlikely(!th)) |
| 2578 | goto out; |
| 2579 | } |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2580 | |
Herbert Xu | 8691173 | 2009-01-29 14:19:50 +0000 | [diff] [blame] | 2581 | skb_gro_pull(skb, thlen); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2582 | |
Herbert Xu | a0a69a0 | 2009-04-17 02:34:38 -0700 | [diff] [blame] | 2583 | len = skb_gro_len(skb); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2584 | flags = tcp_flag_word(th); |
| 2585 | |
| 2586 | for (; (p = *head); head = &p->next) { |
| 2587 | if (!NAPI_GRO_CB(p)->same_flow) |
| 2588 | continue; |
| 2589 | |
| 2590 | th2 = tcp_hdr(p); |
| 2591 | |
Herbert Xu | 745898e | 2009-05-26 18:50:24 +0000 | [diff] [blame] | 2592 | if (*(u32 *)&th->source ^ *(u32 *)&th2->source) { |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2593 | NAPI_GRO_CB(p)->same_flow = 0; |
| 2594 | continue; |
| 2595 | } |
| 2596 | |
| 2597 | goto found; |
| 2598 | } |
| 2599 | |
| 2600 | goto out_check_final; |
| 2601 | |
| 2602 | found: |
| 2603 | flush = NAPI_GRO_CB(p)->flush; |
| 2604 | flush |= flags & TCP_FLAG_CWR; |
| 2605 | flush |= (flags ^ tcp_flag_word(th2)) & |
| 2606 | ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH); |
Herbert Xu | 4a9a296 | 2009-05-26 18:50:25 +0000 | [diff] [blame] | 2607 | flush |= th->ack_seq ^ th2->ack_seq; |
Herbert Xu | a2a804c | 2009-05-26 18:50:34 +0000 | [diff] [blame] | 2608 | for (i = sizeof(*th); i < thlen; i += 4) |
Herbert Xu | aa6320d | 2009-02-08 18:00:40 +0000 | [diff] [blame] | 2609 | flush |= *(u32 *)((u8 *)th + i) ^ |
| 2610 | *(u32 *)((u8 *)th2 + i); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2611 | |
Herbert Xu | b530256 | 2009-01-04 16:13:19 -0800 | [diff] [blame] | 2612 | mss = skb_shinfo(p)->gso_size; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2613 | |
Herbert Xu | 30a3ae3 | 2009-05-26 18:50:26 +0000 | [diff] [blame] | 2614 | flush |= (len - 1) >= mss; |
Herbert Xu | aa6320d | 2009-02-08 18:00:40 +0000 | [diff] [blame] | 2615 | flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2616 | |
| 2617 | if (flush || skb_gro_receive(head, skb)) { |
| 2618 | mss = 1; |
| 2619 | goto out_check_final; |
| 2620 | } |
| 2621 | |
| 2622 | p = *head; |
| 2623 | th2 = tcp_hdr(p); |
| 2624 | tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH); |
| 2625 | |
| 2626 | out_check_final: |
Herbert Xu | a0a69a0 | 2009-04-17 02:34:38 -0700 | [diff] [blame] | 2627 | flush = len < mss; |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2628 | flush |= flags & (TCP_FLAG_URG | TCP_FLAG_PSH | TCP_FLAG_RST | |
| 2629 | TCP_FLAG_SYN | TCP_FLAG_FIN); |
| 2630 | |
| 2631 | if (p && (!NAPI_GRO_CB(skb)->same_flow || flush)) |
| 2632 | pp = head; |
| 2633 | |
| 2634 | out: |
| 2635 | NAPI_GRO_CB(skb)->flush |= flush; |
| 2636 | |
| 2637 | return pp; |
| 2638 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 2639 | EXPORT_SYMBOL(tcp_gro_receive); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2640 | |
| 2641 | int tcp_gro_complete(struct sk_buff *skb) |
| 2642 | { |
| 2643 | struct tcphdr *th = tcp_hdr(skb); |
| 2644 | |
| 2645 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 2646 | skb->csum_offset = offsetof(struct tcphdr, check); |
| 2647 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 2648 | |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2649 | skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count; |
| 2650 | |
| 2651 | if (th->cwr) |
| 2652 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
| 2653 | |
| 2654 | return 0; |
| 2655 | } |
Herbert Xu | 684f217 | 2009-01-08 10:41:23 -0800 | [diff] [blame] | 2656 | EXPORT_SYMBOL(tcp_gro_complete); |
Herbert Xu | bf296b1 | 2008-12-15 23:43:36 -0800 | [diff] [blame] | 2657 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2658 | #ifdef CONFIG_TCP_MD5SIG |
| 2659 | static unsigned long tcp_md5sig_users; |
| 2660 | static struct tcp_md5sig_pool **tcp_md5sig_pool; |
| 2661 | static DEFINE_SPINLOCK(tcp_md5sig_pool_lock); |
| 2662 | |
| 2663 | static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool **pool) |
| 2664 | { |
| 2665 | int cpu; |
| 2666 | for_each_possible_cpu(cpu) { |
| 2667 | struct tcp_md5sig_pool *p = *per_cpu_ptr(pool, cpu); |
| 2668 | if (p) { |
| 2669 | if (p->md5_desc.tfm) |
| 2670 | crypto_free_hash(p->md5_desc.tfm); |
| 2671 | kfree(p); |
| 2672 | p = NULL; |
| 2673 | } |
| 2674 | } |
| 2675 | free_percpu(pool); |
| 2676 | } |
| 2677 | |
| 2678 | void tcp_free_md5sig_pool(void) |
| 2679 | { |
| 2680 | struct tcp_md5sig_pool **pool = NULL; |
| 2681 | |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2682 | spin_lock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2683 | if (--tcp_md5sig_users == 0) { |
| 2684 | pool = tcp_md5sig_pool; |
| 2685 | tcp_md5sig_pool = NULL; |
| 2686 | } |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2687 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2688 | if (pool) |
| 2689 | __tcp_free_md5sig_pool(pool); |
| 2690 | } |
| 2691 | |
| 2692 | EXPORT_SYMBOL(tcp_free_md5sig_pool); |
| 2693 | |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 2694 | static struct tcp_md5sig_pool **__tcp_alloc_md5sig_pool(struct sock *sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2695 | { |
| 2696 | int cpu; |
| 2697 | struct tcp_md5sig_pool **pool; |
| 2698 | |
| 2699 | pool = alloc_percpu(struct tcp_md5sig_pool *); |
| 2700 | if (!pool) |
| 2701 | return NULL; |
| 2702 | |
| 2703 | for_each_possible_cpu(cpu) { |
| 2704 | struct tcp_md5sig_pool *p; |
| 2705 | struct crypto_hash *hash; |
| 2706 | |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 2707 | p = kzalloc(sizeof(*p), sk->sk_allocation); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2708 | if (!p) |
| 2709 | goto out_free; |
| 2710 | *per_cpu_ptr(pool, cpu) = p; |
| 2711 | |
| 2712 | hash = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC); |
| 2713 | if (!hash || IS_ERR(hash)) |
| 2714 | goto out_free; |
| 2715 | |
| 2716 | p->md5_desc.tfm = hash; |
| 2717 | } |
| 2718 | return pool; |
| 2719 | out_free: |
| 2720 | __tcp_free_md5sig_pool(pool); |
| 2721 | return NULL; |
| 2722 | } |
| 2723 | |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 2724 | struct tcp_md5sig_pool **tcp_alloc_md5sig_pool(struct sock *sk) |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2725 | { |
| 2726 | struct tcp_md5sig_pool **pool; |
| 2727 | int alloc = 0; |
| 2728 | |
| 2729 | retry: |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2730 | spin_lock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2731 | pool = tcp_md5sig_pool; |
| 2732 | if (tcp_md5sig_users++ == 0) { |
| 2733 | alloc = 1; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2734 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2735 | } else if (!pool) { |
| 2736 | tcp_md5sig_users--; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2737 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2738 | cpu_relax(); |
| 2739 | goto retry; |
| 2740 | } else |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2741 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2742 | |
| 2743 | if (alloc) { |
| 2744 | /* we cannot hold spinlock here because this may sleep. */ |
Wu Fengguang | aa13307 | 2009-09-02 23:45:45 -0700 | [diff] [blame] | 2745 | struct tcp_md5sig_pool **p = __tcp_alloc_md5sig_pool(sk); |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2746 | spin_lock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2747 | if (!p) { |
| 2748 | tcp_md5sig_users--; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2749 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2750 | return NULL; |
| 2751 | } |
| 2752 | pool = tcp_md5sig_pool; |
| 2753 | if (pool) { |
| 2754 | /* oops, it has already been assigned. */ |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2755 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2756 | __tcp_free_md5sig_pool(p); |
| 2757 | } else { |
| 2758 | tcp_md5sig_pool = pool = p; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2759 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2760 | } |
| 2761 | } |
| 2762 | return pool; |
| 2763 | } |
| 2764 | |
| 2765 | EXPORT_SYMBOL(tcp_alloc_md5sig_pool); |
| 2766 | |
| 2767 | struct tcp_md5sig_pool *__tcp_get_md5sig_pool(int cpu) |
| 2768 | { |
| 2769 | struct tcp_md5sig_pool **p; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2770 | spin_lock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2771 | p = tcp_md5sig_pool; |
| 2772 | if (p) |
| 2773 | tcp_md5sig_users++; |
David S. Miller | 2c4f621 | 2007-02-20 23:51:47 -0800 | [diff] [blame] | 2774 | spin_unlock_bh(&tcp_md5sig_pool_lock); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2775 | return (p ? *per_cpu_ptr(p, cpu) : NULL); |
| 2776 | } |
| 2777 | |
| 2778 | EXPORT_SYMBOL(__tcp_get_md5sig_pool); |
| 2779 | |
David S. Miller | 6931ba7 | 2006-12-13 16:25:44 -0800 | [diff] [blame] | 2780 | void __tcp_put_md5sig_pool(void) |
| 2781 | { |
| 2782 | tcp_free_md5sig_pool(); |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2783 | } |
| 2784 | |
| 2785 | EXPORT_SYMBOL(__tcp_put_md5sig_pool); |
Adam Langley | 49a72df | 2008-07-19 00:01:42 -0700 | [diff] [blame] | 2786 | |
| 2787 | int tcp_md5_hash_header(struct tcp_md5sig_pool *hp, |
| 2788 | struct tcphdr *th) |
| 2789 | { |
| 2790 | struct scatterlist sg; |
| 2791 | int err; |
| 2792 | |
| 2793 | __sum16 old_checksum = th->check; |
| 2794 | th->check = 0; |
| 2795 | /* options aren't included in the hash */ |
| 2796 | sg_init_one(&sg, th, sizeof(struct tcphdr)); |
| 2797 | err = crypto_hash_update(&hp->md5_desc, &sg, sizeof(struct tcphdr)); |
| 2798 | th->check = old_checksum; |
| 2799 | return err; |
| 2800 | } |
| 2801 | |
| 2802 | EXPORT_SYMBOL(tcp_md5_hash_header); |
| 2803 | |
| 2804 | int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp, |
| 2805 | struct sk_buff *skb, unsigned header_len) |
| 2806 | { |
| 2807 | struct scatterlist sg; |
| 2808 | const struct tcphdr *tp = tcp_hdr(skb); |
| 2809 | struct hash_desc *desc = &hp->md5_desc; |
| 2810 | unsigned i; |
| 2811 | const unsigned head_data_len = skb_headlen(skb) > header_len ? |
| 2812 | skb_headlen(skb) - header_len : 0; |
| 2813 | const struct skb_shared_info *shi = skb_shinfo(skb); |
| 2814 | |
| 2815 | sg_init_table(&sg, 1); |
| 2816 | |
| 2817 | sg_set_buf(&sg, ((u8 *) tp) + header_len, head_data_len); |
| 2818 | if (crypto_hash_update(desc, &sg, head_data_len)) |
| 2819 | return 1; |
| 2820 | |
| 2821 | for (i = 0; i < shi->nr_frags; ++i) { |
| 2822 | const struct skb_frag_struct *f = &shi->frags[i]; |
| 2823 | sg_set_page(&sg, f->page, f->size, f->page_offset); |
| 2824 | if (crypto_hash_update(desc, &sg, f->size)) |
| 2825 | return 1; |
| 2826 | } |
| 2827 | |
| 2828 | return 0; |
| 2829 | } |
| 2830 | |
| 2831 | EXPORT_SYMBOL(tcp_md5_hash_skb_data); |
| 2832 | |
| 2833 | int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, struct tcp_md5sig_key *key) |
| 2834 | { |
| 2835 | struct scatterlist sg; |
| 2836 | |
| 2837 | sg_init_one(&sg, key->key, key->keylen); |
| 2838 | return crypto_hash_update(&hp->md5_desc, &sg, key->keylen); |
| 2839 | } |
| 2840 | |
| 2841 | EXPORT_SYMBOL(tcp_md5_hash_key); |
| 2842 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 2843 | #endif |
| 2844 | |
Andi Kleen | 4ac02ba | 2007-04-20 17:11:46 -0700 | [diff] [blame] | 2845 | void tcp_done(struct sock *sk) |
| 2846 | { |
Jianjun Kong | 5a5f3a8 | 2008-11-03 00:24:34 -0800 | [diff] [blame] | 2847 | 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] | 2848 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_ATTEMPTFAILS); |
Andi Kleen | 4ac02ba | 2007-04-20 17:11:46 -0700 | [diff] [blame] | 2849 | |
| 2850 | tcp_set_state(sk, TCP_CLOSE); |
| 2851 | tcp_clear_xmit_timers(sk); |
| 2852 | |
| 2853 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 2854 | |
| 2855 | if (!sock_flag(sk, SOCK_DEAD)) |
| 2856 | sk->sk_state_change(sk); |
| 2857 | else |
| 2858 | inet_csk_destroy_sock(sk); |
| 2859 | } |
| 2860 | EXPORT_SYMBOL_GPL(tcp_done); |
| 2861 | |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2862 | extern struct tcp_congestion_ops tcp_reno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2863 | |
| 2864 | static __initdata unsigned long thash_entries; |
| 2865 | static int __init set_thash_entries(char *str) |
| 2866 | { |
| 2867 | if (!str) |
| 2868 | return 0; |
| 2869 | thash_entries = simple_strtoul(str, &str, 0); |
| 2870 | return 1; |
| 2871 | } |
| 2872 | __setup("thash_entries=", set_thash_entries); |
| 2873 | |
| 2874 | void __init tcp_init(void) |
| 2875 | { |
| 2876 | struct sk_buff *skb = NULL; |
Miquel van Smoorenburg | 57413eb | 2008-06-27 17:23:57 -0700 | [diff] [blame] | 2877 | unsigned long nr_pages, limit; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2878 | int order, i, max_share; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2879 | |
Pavel Emelyanov | 1f9e636 | 2007-12-11 02:12:04 -0800 | [diff] [blame] | 2880 | BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | |
Eric Dumazet | 1748376 | 2008-11-25 21:16:35 -0800 | [diff] [blame] | 2882 | percpu_counter_init(&tcp_sockets_allocated, 0); |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 2883 | percpu_counter_init(&tcp_orphan_count, 0); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2884 | tcp_hashinfo.bind_bucket_cachep = |
| 2885 | kmem_cache_create("tcp_bind_bucket", |
| 2886 | sizeof(struct inet_bind_bucket), 0, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 2887 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2888 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | /* Size and allocate the main established and bind bucket |
| 2890 | * hash tables. |
| 2891 | * |
| 2892 | * The methodology is similar to that of the buffer cache. |
| 2893 | */ |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2894 | tcp_hashinfo.ehash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | alloc_large_system_hash("TCP established", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2896 | sizeof(struct inet_ehash_bucket), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2897 | thash_entries, |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2898 | (totalram_pages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 2899 | 13 : 15, |
John Heffner | 9e950ef | 2006-11-06 23:10:51 -0800 | [diff] [blame] | 2900 | 0, |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2901 | &tcp_hashinfo.ehash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | NULL, |
Jean Delvare | 0ccfe61 | 2007-10-30 00:59:25 -0700 | [diff] [blame] | 2903 | thash_entries ? 0 : 512 * 1024); |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2904 | tcp_hashinfo.ehash_size = 1 << tcp_hashinfo.ehash_size; |
| 2905 | for (i = 0; i < tcp_hashinfo.ehash_size; i++) { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 2906 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].chain, i); |
| 2907 | INIT_HLIST_NULLS_HEAD(&tcp_hashinfo.ehash[i].twchain, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | } |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 2909 | if (inet_ehash_locks_alloc(&tcp_hashinfo)) |
| 2910 | panic("TCP: failed to alloc ehash_locks"); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2911 | tcp_hashinfo.bhash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2912 | alloc_large_system_hash("TCP bind", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2913 | sizeof(struct inet_bind_hashbucket), |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2914 | tcp_hashinfo.ehash_size, |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2915 | (totalram_pages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 2916 | 13 : 15, |
John Heffner | 9e950ef | 2006-11-06 23:10:51 -0800 | [diff] [blame] | 2917 | 0, |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2918 | &tcp_hashinfo.bhash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2919 | NULL, |
| 2920 | 64 * 1024); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2921 | tcp_hashinfo.bhash_size = 1 << tcp_hashinfo.bhash_size; |
| 2922 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
| 2923 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); |
| 2924 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | } |
| 2926 | |
| 2927 | /* Try to be a bit smarter and adjust defaults depending |
| 2928 | * on available memory. |
| 2929 | */ |
| 2930 | for (order = 0; ((1 << order) << PAGE_SHIFT) < |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2931 | (tcp_hashinfo.bhash_size * sizeof(struct inet_bind_hashbucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2932 | order++) |
| 2933 | ; |
Andi Kleen | e762648 | 2005-06-13 14:24:52 -0700 | [diff] [blame] | 2934 | if (order >= 4) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 2935 | tcp_death_row.sysctl_max_tw_buckets = 180000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2936 | sysctl_tcp_max_orphans = 4096 << (order - 4); |
| 2937 | sysctl_max_syn_backlog = 1024; |
| 2938 | } else if (order < 3) { |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 2939 | tcp_death_row.sysctl_max_tw_buckets >>= (3 - order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2940 | sysctl_tcp_max_orphans >>= (3 - order); |
| 2941 | sysctl_max_syn_backlog = 128; |
| 2942 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2943 | |
John Heffner | 53cdcc0 | 2007-03-16 15:04:03 -0700 | [diff] [blame] | 2944 | /* Set the pressure threshold to be a fraction of global memory that |
| 2945 | * is up to 1/2 at 256 MB, decreasing toward zero with the amount of |
| 2946 | * memory, with a floor of 128 pages. |
| 2947 | */ |
Miquel van Smoorenburg | 57413eb | 2008-06-27 17:23:57 -0700 | [diff] [blame] | 2948 | nr_pages = totalram_pages - totalhigh_pages; |
| 2949 | limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); |
| 2950 | limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); |
John Heffner | 53cdcc0 | 2007-03-16 15:04:03 -0700 | [diff] [blame] | 2951 | limit = max(limit, 128UL); |
| 2952 | sysctl_tcp_mem[0] = limit / 4 * 3; |
| 2953 | sysctl_tcp_mem[1] = limit; |
John Heffner | 52bf376 | 2006-11-14 20:25:17 -0800 | [diff] [blame] | 2954 | sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2955 | |
John Heffner | 53cdcc0 | 2007-03-16 15:04:03 -0700 | [diff] [blame] | 2956 | /* Set per-socket limits to no more than 1/128 the pressure threshold */ |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2957 | limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7); |
| 2958 | max_share = min(4UL*1024*1024, limit); |
| 2959 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2960 | sysctl_tcp_wmem[0] = SK_MEM_QUANTUM; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2961 | sysctl_tcp_wmem[1] = 16*1024; |
| 2962 | sysctl_tcp_wmem[2] = max(64*1024, max_share); |
| 2963 | |
Hideo Aoki | 3ab224b | 2007-12-31 00:11:19 -0800 | [diff] [blame] | 2964 | sysctl_tcp_rmem[0] = SK_MEM_QUANTUM; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2965 | sysctl_tcp_rmem[1] = 87380; |
| 2966 | sysctl_tcp_rmem[2] = max(87380, max_share); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2967 | |
| 2968 | printk(KERN_INFO "TCP: Hash tables configured " |
| 2969 | "(established %d bind %d)\n", |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 2970 | tcp_hashinfo.ehash_size, tcp_hashinfo.bhash_size); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 2971 | |
| 2972 | tcp_register_congestion_control(&tcp_reno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2973 | } |
| 2974 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2975 | EXPORT_SYMBOL(tcp_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2976 | EXPORT_SYMBOL(tcp_disconnect); |
| 2977 | EXPORT_SYMBOL(tcp_getsockopt); |
| 2978 | EXPORT_SYMBOL(tcp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | EXPORT_SYMBOL(tcp_poll); |
| 2980 | EXPORT_SYMBOL(tcp_read_sock); |
| 2981 | EXPORT_SYMBOL(tcp_recvmsg); |
| 2982 | EXPORT_SYMBOL(tcp_sendmsg); |
Jens Axboe | 9c55e01 | 2007-11-06 23:30:13 -0800 | [diff] [blame] | 2983 | EXPORT_SYMBOL(tcp_splice_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | EXPORT_SYMBOL(tcp_sendpage); |
| 2985 | EXPORT_SYMBOL(tcp_setsockopt); |
| 2986 | EXPORT_SYMBOL(tcp_shutdown); |