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 | * |
| 8 | * Version: $Id: tcp.c,v 1.216 2002/02/01 22:01:04 davem Exp $ |
| 9 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 10 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * Mark Evans, <evansmp@uhura.aston.ac.uk> |
| 13 | * Corey Minyard <wf-rch!minyard@relay.EU.net> |
| 14 | * Florian La Roche, <flla@stud.uni-sb.de> |
| 15 | * Charles Hedrick, <hedrick@klinzhai.rutgers.edu> |
| 16 | * Linus Torvalds, <torvalds@cs.helsinki.fi> |
| 17 | * Alan Cox, <gw4pts@gw4pts.ampr.org> |
| 18 | * Matthew Dillon, <dillon@apollo.west.oic.com> |
| 19 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> |
| 20 | * Jorge Cwik, <jorge@laser.satlink.net> |
| 21 | * |
| 22 | * Fixes: |
| 23 | * Alan Cox : Numerous verify_area() calls |
| 24 | * Alan Cox : Set the ACK bit on a reset |
| 25 | * Alan Cox : Stopped it crashing if it closed while |
| 26 | * sk->inuse=1 and was trying to connect |
| 27 | * (tcp_err()). |
| 28 | * Alan Cox : All icmp error handling was broken |
| 29 | * pointers passed where wrong and the |
| 30 | * socket was looked up backwards. Nobody |
| 31 | * tested any icmp error code obviously. |
| 32 | * Alan Cox : tcp_err() now handled properly. It |
| 33 | * wakes people on errors. poll |
| 34 | * behaves and the icmp error race |
| 35 | * has gone by moving it into sock.c |
| 36 | * Alan Cox : tcp_send_reset() fixed to work for |
| 37 | * everything not just packets for |
| 38 | * unknown sockets. |
| 39 | * Alan Cox : tcp option processing. |
| 40 | * Alan Cox : Reset tweaked (still not 100%) [Had |
| 41 | * syn rule wrong] |
| 42 | * Herp Rosmanith : More reset fixes |
| 43 | * Alan Cox : No longer acks invalid rst frames. |
| 44 | * Acking any kind of RST is right out. |
| 45 | * Alan Cox : Sets an ignore me flag on an rst |
| 46 | * receive otherwise odd bits of prattle |
| 47 | * escape still |
| 48 | * Alan Cox : Fixed another acking RST frame bug. |
| 49 | * Should stop LAN workplace lockups. |
| 50 | * Alan Cox : Some tidyups using the new skb list |
| 51 | * facilities |
| 52 | * Alan Cox : sk->keepopen now seems to work |
| 53 | * Alan Cox : Pulls options out correctly on accepts |
| 54 | * Alan Cox : Fixed assorted sk->rqueue->next errors |
| 55 | * Alan Cox : PSH doesn't end a TCP read. Switched a |
| 56 | * bit to skb ops. |
| 57 | * Alan Cox : Tidied tcp_data to avoid a potential |
| 58 | * nasty. |
| 59 | * Alan Cox : Added some better commenting, as the |
| 60 | * tcp is hard to follow |
| 61 | * Alan Cox : Removed incorrect check for 20 * psh |
| 62 | * Michael O'Reilly : ack < copied bug fix. |
| 63 | * Johannes Stille : Misc tcp fixes (not all in yet). |
| 64 | * Alan Cox : FIN with no memory -> CRASH |
| 65 | * Alan Cox : Added socket option proto entries. |
| 66 | * Also added awareness of them to accept. |
| 67 | * Alan Cox : Added TCP options (SOL_TCP) |
| 68 | * Alan Cox : Switched wakeup calls to callbacks, |
| 69 | * so the kernel can layer network |
| 70 | * sockets. |
| 71 | * Alan Cox : Use ip_tos/ip_ttl settings. |
| 72 | * Alan Cox : Handle FIN (more) properly (we hope). |
| 73 | * Alan Cox : RST frames sent on unsynchronised |
| 74 | * state ack error. |
| 75 | * Alan Cox : Put in missing check for SYN bit. |
| 76 | * Alan Cox : Added tcp_select_window() aka NET2E |
| 77 | * window non shrink trick. |
| 78 | * Alan Cox : Added a couple of small NET2E timer |
| 79 | * fixes |
| 80 | * Charles Hedrick : TCP fixes |
| 81 | * Toomas Tamm : TCP window fixes |
| 82 | * Alan Cox : Small URG fix to rlogin ^C ack fight |
| 83 | * Charles Hedrick : Rewrote most of it to actually work |
| 84 | * Linus : Rewrote tcp_read() and URG handling |
| 85 | * completely |
| 86 | * Gerhard Koerting: Fixed some missing timer handling |
| 87 | * Matthew Dillon : Reworked TCP machine states as per RFC |
| 88 | * Gerhard Koerting: PC/TCP workarounds |
| 89 | * Adam Caldwell : Assorted timer/timing errors |
| 90 | * Matthew Dillon : Fixed another RST bug |
| 91 | * Alan Cox : Move to kernel side addressing changes. |
| 92 | * Alan Cox : Beginning work on TCP fastpathing |
| 93 | * (not yet usable) |
| 94 | * Arnt Gulbrandsen: Turbocharged tcp_check() routine. |
| 95 | * Alan Cox : TCP fast path debugging |
| 96 | * Alan Cox : Window clamping |
| 97 | * Michael Riepe : Bug in tcp_check() |
| 98 | * Matt Dillon : More TCP improvements and RST bug fixes |
| 99 | * Matt Dillon : Yet more small nasties remove from the |
| 100 | * TCP code (Be very nice to this man if |
| 101 | * tcp finally works 100%) 8) |
| 102 | * Alan Cox : BSD accept semantics. |
| 103 | * Alan Cox : Reset on closedown bug. |
| 104 | * Peter De Schrijver : ENOTCONN check missing in tcp_sendto(). |
| 105 | * Michael Pall : Handle poll() after URG properly in |
| 106 | * all cases. |
| 107 | * Michael Pall : Undo the last fix in tcp_read_urg() |
| 108 | * (multi URG PUSH broke rlogin). |
| 109 | * Michael Pall : Fix the multi URG PUSH problem in |
| 110 | * tcp_readable(), poll() after URG |
| 111 | * works now. |
| 112 | * Michael Pall : recv(...,MSG_OOB) never blocks in the |
| 113 | * BSD api. |
| 114 | * Alan Cox : Changed the semantics of sk->socket to |
| 115 | * fix a race and a signal problem with |
| 116 | * accept() and async I/O. |
| 117 | * Alan Cox : Relaxed the rules on tcp_sendto(). |
| 118 | * Yury Shevchuk : Really fixed accept() blocking problem. |
| 119 | * Craig I. Hagan : Allow for BSD compatible TIME_WAIT for |
| 120 | * clients/servers which listen in on |
| 121 | * fixed ports. |
| 122 | * Alan Cox : Cleaned the above up and shrank it to |
| 123 | * a sensible code size. |
| 124 | * Alan Cox : Self connect lockup fix. |
| 125 | * Alan Cox : No connect to multicast. |
| 126 | * Ross Biro : Close unaccepted children on master |
| 127 | * socket close. |
| 128 | * Alan Cox : Reset tracing code. |
| 129 | * Alan Cox : Spurious resets on shutdown. |
| 130 | * Alan Cox : Giant 15 minute/60 second timer error |
| 131 | * Alan Cox : Small whoops in polling before an |
| 132 | * accept. |
| 133 | * Alan Cox : Kept the state trace facility since |
| 134 | * it's handy for debugging. |
| 135 | * Alan Cox : More reset handler fixes. |
| 136 | * Alan Cox : Started rewriting the code based on |
| 137 | * the RFC's for other useful protocol |
| 138 | * references see: Comer, KA9Q NOS, and |
| 139 | * for a reference on the difference |
| 140 | * between specifications and how BSD |
| 141 | * works see the 4.4lite source. |
| 142 | * A.N.Kuznetsov : Don't time wait on completion of tidy |
| 143 | * close. |
| 144 | * Linus Torvalds : Fin/Shutdown & copied_seq changes. |
| 145 | * Linus Torvalds : Fixed BSD port reuse to work first syn |
| 146 | * Alan Cox : Reimplemented timers as per the RFC |
| 147 | * and using multiple timers for sanity. |
| 148 | * Alan Cox : Small bug fixes, and a lot of new |
| 149 | * comments. |
| 150 | * Alan Cox : Fixed dual reader crash by locking |
| 151 | * the buffers (much like datagram.c) |
| 152 | * Alan Cox : Fixed stuck sockets in probe. A probe |
| 153 | * now gets fed up of retrying without |
| 154 | * (even a no space) answer. |
| 155 | * Alan Cox : Extracted closing code better |
| 156 | * Alan Cox : Fixed the closing state machine to |
| 157 | * resemble the RFC. |
| 158 | * Alan Cox : More 'per spec' fixes. |
| 159 | * Jorge Cwik : Even faster checksumming. |
| 160 | * Alan Cox : tcp_data() doesn't ack illegal PSH |
| 161 | * only frames. At least one pc tcp stack |
| 162 | * generates them. |
| 163 | * Alan Cox : Cache last socket. |
| 164 | * Alan Cox : Per route irtt. |
| 165 | * Matt Day : poll()->select() match BSD precisely on error |
| 166 | * Alan Cox : New buffers |
| 167 | * Marc Tamsky : Various sk->prot->retransmits and |
| 168 | * sk->retransmits misupdating fixed. |
| 169 | * Fixed tcp_write_timeout: stuck close, |
| 170 | * and TCP syn retries gets used now. |
| 171 | * Mark Yarvis : In tcp_read_wakeup(), don't send an |
| 172 | * ack if state is TCP_CLOSED. |
| 173 | * Alan Cox : Look up device on a retransmit - routes may |
| 174 | * change. Doesn't yet cope with MSS shrink right |
| 175 | * but it's a start! |
| 176 | * Marc Tamsky : Closing in closing fixes. |
| 177 | * Mike Shaver : RFC1122 verifications. |
| 178 | * Alan Cox : rcv_saddr errors. |
| 179 | * Alan Cox : Block double connect(). |
| 180 | * Alan Cox : Small hooks for enSKIP. |
| 181 | * Alexey Kuznetsov: Path MTU discovery. |
| 182 | * Alan Cox : Support soft errors. |
| 183 | * Alan Cox : Fix MTU discovery pathological case |
| 184 | * when the remote claims no mtu! |
| 185 | * Marc Tamsky : TCP_CLOSE fix. |
| 186 | * Colin (G3TNE) : Send a reset on syn ack replies in |
| 187 | * window but wrong (fixes NT lpd problems) |
| 188 | * Pedro Roque : Better TCP window handling, delayed ack. |
| 189 | * Joerg Reuter : No modification of locked buffers in |
| 190 | * tcp_do_retransmit() |
| 191 | * Eric Schenk : Changed receiver side silly window |
| 192 | * avoidance algorithm to BSD style |
| 193 | * algorithm. This doubles throughput |
| 194 | * against machines running Solaris, |
| 195 | * and seems to result in general |
| 196 | * improvement. |
| 197 | * Stefan Magdalinski : adjusted tcp_readable() to fix FIONREAD |
| 198 | * Willy Konynenberg : Transparent proxying support. |
| 199 | * Mike McLagan : Routing by source |
| 200 | * Keith Owens : Do proper merging with partial SKB's in |
| 201 | * tcp_do_sendmsg to avoid burstiness. |
| 202 | * Eric Schenk : Fix fast close down bug with |
| 203 | * shutdown() followed by close(). |
| 204 | * Andi Kleen : Make poll agree with SIGIO |
| 205 | * Salvatore Sanfilippo : Support SO_LINGER with linger == 1 and |
| 206 | * lingertime == 0 (RFC 793 ABORT Call) |
| 207 | * Hirokazu Takahashi : Use copy_from_user() instead of |
| 208 | * csum_and_copy_from_user() if possible. |
| 209 | * |
| 210 | * This program is free software; you can redistribute it and/or |
| 211 | * modify it under the terms of the GNU General Public License |
| 212 | * as published by the Free Software Foundation; either version |
| 213 | * 2 of the License, or(at your option) any later version. |
| 214 | * |
| 215 | * Description of States: |
| 216 | * |
| 217 | * TCP_SYN_SENT sent a connection request, waiting for ack |
| 218 | * |
| 219 | * TCP_SYN_RECV received a connection request, sent ack, |
| 220 | * waiting for final ack in three-way handshake. |
| 221 | * |
| 222 | * TCP_ESTABLISHED connection established |
| 223 | * |
| 224 | * TCP_FIN_WAIT1 our side has shutdown, waiting to complete |
| 225 | * transmission of remaining buffered data |
| 226 | * |
| 227 | * TCP_FIN_WAIT2 all buffered data sent, waiting for remote |
| 228 | * to shutdown |
| 229 | * |
| 230 | * TCP_CLOSING both sides have shutdown but we still have |
| 231 | * data we have to finish sending |
| 232 | * |
| 233 | * TCP_TIME_WAIT timeout to catch resent junk before entering |
| 234 | * closed, can only be entered from FIN_WAIT2 |
| 235 | * or CLOSING. Required because the other end |
| 236 | * may not have gotten our last ACK causing it |
| 237 | * to retransmit the data packet (which we ignore) |
| 238 | * |
| 239 | * TCP_CLOSE_WAIT remote side has shutdown and is waiting for |
| 240 | * us to finish writing our data and to shutdown |
| 241 | * (we have to close() to move on to LAST_ACK) |
| 242 | * |
| 243 | * TCP_LAST_ACK out side has shutdown after remote has |
| 244 | * shutdown. There may still be data in our |
| 245 | * buffer that we have to finish sending |
| 246 | * |
| 247 | * TCP_CLOSE socket is finished |
| 248 | */ |
| 249 | |
| 250 | #include <linux/config.h> |
| 251 | #include <linux/module.h> |
| 252 | #include <linux/types.h> |
| 253 | #include <linux/fcntl.h> |
| 254 | #include <linux/poll.h> |
| 255 | #include <linux/init.h> |
| 256 | #include <linux/smp_lock.h> |
| 257 | #include <linux/fs.h> |
| 258 | #include <linux/random.h> |
| 259 | #include <linux/bootmem.h> |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 260 | #include <linux/cache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
| 262 | #include <net/icmp.h> |
| 263 | #include <net/tcp.h> |
| 264 | #include <net/xfrm.h> |
| 265 | #include <net/ip.h> |
| 266 | |
| 267 | |
| 268 | #include <asm/uaccess.h> |
| 269 | #include <asm/ioctls.h> |
| 270 | |
| 271 | int sysctl_tcp_fin_timeout = TCP_FIN_TIMEOUT; |
| 272 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 273 | DEFINE_SNMP_STAT(struct tcp_mib, tcp_statistics) __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | atomic_t tcp_orphan_count = ATOMIC_INIT(0); |
| 276 | |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 277 | EXPORT_SYMBOL_GPL(tcp_orphan_count); |
| 278 | |
David S. Miller | b8059ea | 2006-03-25 01:36:56 -0800 | [diff] [blame] | 279 | int sysctl_tcp_mem[3] __read_mostly; |
| 280 | int sysctl_tcp_wmem[3] __read_mostly; |
| 281 | int sysctl_tcp_rmem[3] __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | EXPORT_SYMBOL(sysctl_tcp_mem); |
| 284 | EXPORT_SYMBOL(sysctl_tcp_rmem); |
| 285 | EXPORT_SYMBOL(sysctl_tcp_wmem); |
| 286 | |
| 287 | atomic_t tcp_memory_allocated; /* Current allocated memory. */ |
| 288 | atomic_t tcp_sockets_allocated; /* Current number of TCP sockets. */ |
| 289 | |
| 290 | EXPORT_SYMBOL(tcp_memory_allocated); |
| 291 | EXPORT_SYMBOL(tcp_sockets_allocated); |
| 292 | |
| 293 | /* |
| 294 | * Pressure flag: try to collapse. |
| 295 | * Technical note: it is used by multiple contexts non atomically. |
| 296 | * All the sk_stream_mem_schedule() is of this nature: accounting |
| 297 | * is strict, actions are advisory and have some latency. |
| 298 | */ |
| 299 | int tcp_memory_pressure; |
| 300 | |
| 301 | EXPORT_SYMBOL(tcp_memory_pressure); |
| 302 | |
| 303 | void tcp_enter_memory_pressure(void) |
| 304 | { |
| 305 | if (!tcp_memory_pressure) { |
| 306 | NET_INC_STATS(LINUX_MIB_TCPMEMORYPRESSURES); |
| 307 | tcp_memory_pressure = 1; |
| 308 | } |
| 309 | } |
| 310 | |
| 311 | EXPORT_SYMBOL(tcp_enter_memory_pressure); |
| 312 | |
| 313 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | * Wait for a TCP event. |
| 315 | * |
| 316 | * Note that we don't need to lock the socket, as the upper poll layers |
| 317 | * take care of normal races (between the test and the event) and we don't |
| 318 | * go look at any of the socket buffers directly. |
| 319 | */ |
| 320 | unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 321 | { |
| 322 | unsigned int mask; |
| 323 | struct sock *sk = sock->sk; |
| 324 | struct tcp_sock *tp = tcp_sk(sk); |
| 325 | |
| 326 | poll_wait(file, sk->sk_sleep, wait); |
| 327 | if (sk->sk_state == TCP_LISTEN) |
Arnaldo Carvalho de Melo | dc40c7b | 2005-08-23 21:52:58 -0700 | [diff] [blame] | 328 | return inet_csk_listen_poll(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
| 330 | /* Socket is not locked. We are protected from async events |
| 331 | by poll logic and correct handling of state changes |
| 332 | made by another threads is impossible in any case. |
| 333 | */ |
| 334 | |
| 335 | mask = 0; |
| 336 | if (sk->sk_err) |
| 337 | mask = POLLERR; |
| 338 | |
| 339 | /* |
| 340 | * POLLHUP is certainly not done right. But poll() doesn't |
| 341 | * have a notion of HUP in just one direction, and for a |
| 342 | * socket the read side is more interesting. |
| 343 | * |
| 344 | * Some poll() documentation says that POLLHUP is incompatible |
| 345 | * with the POLLOUT/POLLWR flags, so somebody should check this |
| 346 | * all. But careful, it tends to be safer to return too many |
| 347 | * bits than too few, and you can easily break real applications |
| 348 | * if you don't tell them that something has hung up! |
| 349 | * |
| 350 | * Check-me. |
| 351 | * |
| 352 | * Check number 1. POLLHUP is _UNMASKABLE_ event (see UNIX98 and |
| 353 | * our fs/select.c). It means that after we received EOF, |
| 354 | * poll always returns immediately, making impossible poll() on write() |
| 355 | * in state CLOSE_WAIT. One solution is evident --- to set POLLHUP |
| 356 | * if and only if shutdown has been made in both directions. |
| 357 | * Actually, it is interesting to look how Solaris and DUX |
| 358 | * solve this dilemma. I would prefer, if PULLHUP were maskable, |
| 359 | * then we could set it on SND_SHUTDOWN. BTW examples given |
| 360 | * in Stevens' books assume exactly this behaviour, it explains |
| 361 | * why PULLHUP is incompatible with POLLOUT. --ANK |
| 362 | * |
| 363 | * NOTE. Check for TCP_CLOSE is added. The goal is to prevent |
| 364 | * blocking on fresh not-connected or disconnected socket. --ANK |
| 365 | */ |
| 366 | if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == TCP_CLOSE) |
| 367 | mask |= POLLHUP; |
| 368 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 369 | mask |= POLLIN | POLLRDNORM | POLLRDHUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | /* Connected? */ |
| 372 | if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
| 373 | /* Potential race condition. If read of tp below will |
| 374 | * escape above sk->sk_state, we can be illegally awaken |
| 375 | * in SYN_* states. */ |
| 376 | if ((tp->rcv_nxt != tp->copied_seq) && |
| 377 | (tp->urg_seq != tp->copied_seq || |
| 378 | tp->rcv_nxt != tp->copied_seq + 1 || |
| 379 | sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data)) |
| 380 | mask |= POLLIN | POLLRDNORM; |
| 381 | |
| 382 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| 383 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 384 | mask |= POLLOUT | POLLWRNORM; |
| 385 | } else { /* send SIGIO later */ |
| 386 | set_bit(SOCK_ASYNC_NOSPACE, |
| 387 | &sk->sk_socket->flags); |
| 388 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 389 | |
| 390 | /* Race breaker. If space is freed after |
| 391 | * wspace test but before the flags are set, |
| 392 | * IO signal will be lost. |
| 393 | */ |
| 394 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) |
| 395 | mask |= POLLOUT | POLLWRNORM; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | if (tp->urg_data & TCP_URG_VALID) |
| 400 | mask |= POLLPRI; |
| 401 | } |
| 402 | return mask; |
| 403 | } |
| 404 | |
| 405 | int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 406 | { |
| 407 | struct tcp_sock *tp = tcp_sk(sk); |
| 408 | int answ; |
| 409 | |
| 410 | switch (cmd) { |
| 411 | case SIOCINQ: |
| 412 | if (sk->sk_state == TCP_LISTEN) |
| 413 | return -EINVAL; |
| 414 | |
| 415 | lock_sock(sk); |
| 416 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 417 | answ = 0; |
| 418 | else if (sock_flag(sk, SOCK_URGINLINE) || |
| 419 | !tp->urg_data || |
| 420 | before(tp->urg_seq, tp->copied_seq) || |
| 421 | !before(tp->urg_seq, tp->rcv_nxt)) { |
| 422 | answ = tp->rcv_nxt - tp->copied_seq; |
| 423 | |
| 424 | /* Subtract 1, if FIN is in queue. */ |
| 425 | if (answ && !skb_queue_empty(&sk->sk_receive_queue)) |
| 426 | answ -= |
| 427 | ((struct sk_buff *)sk->sk_receive_queue.prev)->h.th->fin; |
| 428 | } else |
| 429 | answ = tp->urg_seq - tp->copied_seq; |
| 430 | release_sock(sk); |
| 431 | break; |
| 432 | case SIOCATMARK: |
| 433 | answ = tp->urg_data && tp->urg_seq == tp->copied_seq; |
| 434 | break; |
| 435 | case SIOCOUTQ: |
| 436 | if (sk->sk_state == TCP_LISTEN) |
| 437 | return -EINVAL; |
| 438 | |
| 439 | if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) |
| 440 | answ = 0; |
| 441 | else |
| 442 | answ = tp->write_seq - tp->snd_una; |
| 443 | break; |
| 444 | default: |
| 445 | return -ENOIOCTLCMD; |
| 446 | }; |
| 447 | |
| 448 | return put_user(answ, (int __user *)arg); |
| 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | static inline void tcp_mark_push(struct tcp_sock *tp, struct sk_buff *skb) |
| 452 | { |
| 453 | TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_PSH; |
| 454 | tp->pushed_seq = tp->write_seq; |
| 455 | } |
| 456 | |
| 457 | static inline int forced_push(struct tcp_sock *tp) |
| 458 | { |
| 459 | return after(tp->write_seq, tp->pushed_seq + (tp->max_window >> 1)); |
| 460 | } |
| 461 | |
| 462 | static inline void skb_entail(struct sock *sk, struct tcp_sock *tp, |
| 463 | struct sk_buff *skb) |
| 464 | { |
| 465 | skb->csum = 0; |
| 466 | TCP_SKB_CB(skb)->seq = tp->write_seq; |
| 467 | TCP_SKB_CB(skb)->end_seq = tp->write_seq; |
| 468 | TCP_SKB_CB(skb)->flags = TCPCB_FLAG_ACK; |
| 469 | TCP_SKB_CB(skb)->sacked = 0; |
| 470 | skb_header_release(skb); |
| 471 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 472 | sk_charge_skb(sk, skb); |
| 473 | if (!sk->sk_send_head) |
| 474 | sk->sk_send_head = skb; |
David S. Miller | 89ebd19 | 2005-08-23 10:13:06 -0700 | [diff] [blame] | 475 | if (tp->nonagle & TCP_NAGLE_PUSH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | tp->nonagle &= ~TCP_NAGLE_PUSH; |
| 477 | } |
| 478 | |
| 479 | static inline void tcp_mark_urg(struct tcp_sock *tp, int flags, |
| 480 | struct sk_buff *skb) |
| 481 | { |
| 482 | if (flags & MSG_OOB) { |
| 483 | tp->urg_mode = 1; |
| 484 | tp->snd_up = tp->write_seq; |
| 485 | TCP_SKB_CB(skb)->sacked |= TCPCB_URG; |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | static inline void tcp_push(struct sock *sk, struct tcp_sock *tp, int flags, |
| 490 | int mss_now, int nonagle) |
| 491 | { |
| 492 | if (sk->sk_send_head) { |
| 493 | struct sk_buff *skb = sk->sk_write_queue.prev; |
| 494 | if (!(flags & MSG_MORE) || forced_push(tp)) |
| 495 | tcp_mark_push(tp, skb); |
| 496 | tcp_mark_urg(tp, flags, skb); |
| 497 | __tcp_push_pending_frames(sk, tp, mss_now, |
| 498 | (flags & MSG_MORE) ? TCP_NAGLE_CORK : nonagle); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | static ssize_t do_tcp_sendpages(struct sock *sk, struct page **pages, int poffset, |
| 503 | size_t psize, int flags) |
| 504 | { |
| 505 | struct tcp_sock *tp = tcp_sk(sk); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 506 | int mss_now, size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | int err; |
| 508 | ssize_t copied; |
| 509 | long timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 510 | |
| 511 | /* Wait for a connection to finish. */ |
| 512 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) |
| 513 | if ((err = sk_stream_wait_connect(sk, &timeo)) != 0) |
| 514 | goto out_err; |
| 515 | |
| 516 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 517 | |
| 518 | mss_now = tcp_current_mss(sk, !(flags&MSG_OOB)); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 519 | size_goal = tp->xmit_size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | copied = 0; |
| 521 | |
| 522 | err = -EPIPE; |
| 523 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
| 524 | goto do_error; |
| 525 | |
| 526 | while (psize > 0) { |
| 527 | struct sk_buff *skb = sk->sk_write_queue.prev; |
| 528 | struct page *page = pages[poffset / PAGE_SIZE]; |
| 529 | int copy, i, can_coalesce; |
| 530 | int offset = poffset % PAGE_SIZE; |
| 531 | int size = min_t(size_t, psize, PAGE_SIZE - offset); |
| 532 | |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 533 | if (!sk->sk_send_head || (copy = size_goal - skb->len) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | new_segment: |
| 535 | if (!sk_stream_memory_free(sk)) |
| 536 | goto wait_for_sndbuf; |
| 537 | |
| 538 | skb = sk_stream_alloc_pskb(sk, 0, 0, |
| 539 | sk->sk_allocation); |
| 540 | if (!skb) |
| 541 | goto wait_for_memory; |
| 542 | |
| 543 | skb_entail(sk, tp, skb); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 544 | copy = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | |
| 547 | if (copy > size) |
| 548 | copy = size; |
| 549 | |
| 550 | i = skb_shinfo(skb)->nr_frags; |
| 551 | can_coalesce = skb_can_coalesce(skb, i, page, offset); |
| 552 | if (!can_coalesce && i >= MAX_SKB_FRAGS) { |
| 553 | tcp_mark_push(tp, skb); |
| 554 | goto new_segment; |
| 555 | } |
Herbert Xu | d80d99d | 2005-09-01 17:48:23 -0700 | [diff] [blame] | 556 | if (!sk_stream_wmem_schedule(sk, copy)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | goto wait_for_memory; |
| 558 | |
| 559 | if (can_coalesce) { |
| 560 | skb_shinfo(skb)->frags[i - 1].size += copy; |
| 561 | } else { |
| 562 | get_page(page); |
| 563 | skb_fill_page_desc(skb, i, page, offset, copy); |
| 564 | } |
| 565 | |
| 566 | skb->len += copy; |
| 567 | skb->data_len += copy; |
| 568 | skb->truesize += copy; |
| 569 | sk->sk_wmem_queued += copy; |
| 570 | sk->sk_forward_alloc -= copy; |
| 571 | skb->ip_summed = CHECKSUM_HW; |
| 572 | tp->write_seq += copy; |
| 573 | TCP_SKB_CB(skb)->end_seq += copy; |
| 574 | skb_shinfo(skb)->tso_segs = 0; |
| 575 | |
| 576 | if (!copied) |
| 577 | TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH; |
| 578 | |
| 579 | copied += copy; |
| 580 | poffset += copy; |
| 581 | if (!(psize -= copy)) |
| 582 | goto out; |
| 583 | |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 584 | if (skb->len < mss_now || (flags & MSG_OOB)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | continue; |
| 586 | |
| 587 | if (forced_push(tp)) { |
| 588 | tcp_mark_push(tp, skb); |
| 589 | __tcp_push_pending_frames(sk, tp, mss_now, TCP_NAGLE_PUSH); |
| 590 | } else if (skb == sk->sk_send_head) |
| 591 | tcp_push_one(sk, mss_now); |
| 592 | continue; |
| 593 | |
| 594 | wait_for_sndbuf: |
| 595 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 596 | wait_for_memory: |
| 597 | if (copied) |
| 598 | tcp_push(sk, tp, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH); |
| 599 | |
| 600 | if ((err = sk_stream_wait_memory(sk, &timeo)) != 0) |
| 601 | goto do_error; |
| 602 | |
| 603 | mss_now = tcp_current_mss(sk, !(flags&MSG_OOB)); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 604 | size_goal = tp->xmit_size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | out: |
| 608 | if (copied) |
| 609 | tcp_push(sk, tp, flags, mss_now, tp->nonagle); |
| 610 | return copied; |
| 611 | |
| 612 | do_error: |
| 613 | if (copied) |
| 614 | goto out; |
| 615 | out_err: |
| 616 | return sk_stream_error(sk, flags, err); |
| 617 | } |
| 618 | |
| 619 | ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, |
| 620 | size_t size, int flags) |
| 621 | { |
| 622 | ssize_t res; |
| 623 | struct sock *sk = sock->sk; |
| 624 | |
| 625 | #define TCP_ZC_CSUM_FLAGS (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM) |
| 626 | |
| 627 | if (!(sk->sk_route_caps & NETIF_F_SG) || |
| 628 | !(sk->sk_route_caps & TCP_ZC_CSUM_FLAGS)) |
| 629 | return sock_no_sendpage(sock, page, offset, size, flags); |
| 630 | |
| 631 | #undef TCP_ZC_CSUM_FLAGS |
| 632 | |
| 633 | lock_sock(sk); |
| 634 | TCP_CHECK_TIMER(sk); |
| 635 | res = do_tcp_sendpages(sk, &page, offset, size, flags); |
| 636 | TCP_CHECK_TIMER(sk); |
| 637 | release_sock(sk); |
| 638 | return res; |
| 639 | } |
| 640 | |
| 641 | #define TCP_PAGE(sk) (sk->sk_sndmsg_page) |
| 642 | #define TCP_OFF(sk) (sk->sk_sndmsg_off) |
| 643 | |
| 644 | static inline int select_size(struct sock *sk, struct tcp_sock *tp) |
| 645 | { |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 646 | int tmp = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
David S. Miller | b4e26f5 | 2005-07-05 15:20:27 -0700 | [diff] [blame] | 648 | if (sk->sk_route_caps & NETIF_F_SG) { |
| 649 | if (sk->sk_route_caps & NETIF_F_TSO) |
| 650 | tmp = 0; |
| 651 | else { |
| 652 | int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER); |
| 653 | |
| 654 | if (tmp >= pgbreak && |
| 655 | tmp <= pgbreak + (MAX_SKB_FRAGS - 1) * PAGE_SIZE) |
| 656 | tmp = pgbreak; |
| 657 | } |
| 658 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | return tmp; |
| 661 | } |
| 662 | |
| 663 | int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 664 | size_t size) |
| 665 | { |
| 666 | struct iovec *iov; |
| 667 | struct tcp_sock *tp = tcp_sk(sk); |
| 668 | struct sk_buff *skb; |
| 669 | int iovlen, flags; |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 670 | int mss_now, size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | int err, copied; |
| 672 | long timeo; |
| 673 | |
| 674 | lock_sock(sk); |
| 675 | TCP_CHECK_TIMER(sk); |
| 676 | |
| 677 | flags = msg->msg_flags; |
| 678 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 679 | |
| 680 | /* Wait for a connection to finish. */ |
| 681 | if ((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)) |
| 682 | if ((err = sk_stream_wait_connect(sk, &timeo)) != 0) |
| 683 | goto out_err; |
| 684 | |
| 685 | /* This should be in poll */ |
| 686 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 687 | |
| 688 | mss_now = tcp_current_mss(sk, !(flags&MSG_OOB)); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 689 | size_goal = tp->xmit_size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | /* Ok commence sending. */ |
| 692 | iovlen = msg->msg_iovlen; |
| 693 | iov = msg->msg_iov; |
| 694 | copied = 0; |
| 695 | |
| 696 | err = -EPIPE; |
| 697 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
| 698 | goto do_error; |
| 699 | |
| 700 | while (--iovlen >= 0) { |
| 701 | int seglen = iov->iov_len; |
| 702 | unsigned char __user *from = iov->iov_base; |
| 703 | |
| 704 | iov++; |
| 705 | |
| 706 | while (seglen > 0) { |
| 707 | int copy; |
| 708 | |
| 709 | skb = sk->sk_write_queue.prev; |
| 710 | |
| 711 | if (!sk->sk_send_head || |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 712 | (copy = size_goal - skb->len) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | new_segment: |
| 715 | /* Allocate new segment. If the interface is SG, |
| 716 | * allocate skb fitting to single page. |
| 717 | */ |
| 718 | if (!sk_stream_memory_free(sk)) |
| 719 | goto wait_for_sndbuf; |
| 720 | |
| 721 | skb = sk_stream_alloc_pskb(sk, select_size(sk, tp), |
| 722 | 0, sk->sk_allocation); |
| 723 | if (!skb) |
| 724 | goto wait_for_memory; |
| 725 | |
| 726 | /* |
| 727 | * Check whether we can use HW checksum. |
| 728 | */ |
| 729 | if (sk->sk_route_caps & |
| 730 | (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | |
| 731 | NETIF_F_HW_CSUM)) |
| 732 | skb->ip_summed = CHECKSUM_HW; |
| 733 | |
| 734 | skb_entail(sk, tp, skb); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 735 | copy = size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | /* Try to append data to the end of skb. */ |
| 739 | if (copy > seglen) |
| 740 | copy = seglen; |
| 741 | |
| 742 | /* Where to copy to? */ |
| 743 | if (skb_tailroom(skb) > 0) { |
| 744 | /* We have some space in skb head. Superb! */ |
| 745 | if (copy > skb_tailroom(skb)) |
| 746 | copy = skb_tailroom(skb); |
| 747 | if ((err = skb_add_data(skb, from, copy)) != 0) |
| 748 | goto do_fault; |
| 749 | } else { |
| 750 | int merge = 0; |
| 751 | int i = skb_shinfo(skb)->nr_frags; |
| 752 | struct page *page = TCP_PAGE(sk); |
| 753 | int off = TCP_OFF(sk); |
| 754 | |
| 755 | if (skb_can_coalesce(skb, i, page, off) && |
| 756 | off != PAGE_SIZE) { |
| 757 | /* We can extend the last page |
| 758 | * fragment. */ |
| 759 | merge = 1; |
| 760 | } else if (i == MAX_SKB_FRAGS || |
| 761 | (!i && |
| 762 | !(sk->sk_route_caps & NETIF_F_SG))) { |
| 763 | /* Need to add new fragment and cannot |
| 764 | * do this because interface is non-SG, |
| 765 | * or because all the page slots are |
| 766 | * busy. */ |
| 767 | tcp_mark_push(tp, skb); |
| 768 | goto new_segment; |
| 769 | } else if (page) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | if (off == PAGE_SIZE) { |
| 771 | put_page(page); |
| 772 | TCP_PAGE(sk) = page = NULL; |
Herbert Xu | fb5f5e6 | 2005-09-05 18:55:48 -0700 | [diff] [blame] | 773 | off = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 775 | } else |
Herbert Xu | fb5f5e6 | 2005-09-05 18:55:48 -0700 | [diff] [blame] | 776 | off = 0; |
Herbert Xu | ef01578 | 2005-09-01 17:48:59 -0700 | [diff] [blame] | 777 | |
| 778 | if (copy > PAGE_SIZE - off) |
| 779 | copy = PAGE_SIZE - off; |
| 780 | |
| 781 | if (!sk_stream_wmem_schedule(sk, copy)) |
| 782 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
| 784 | if (!page) { |
| 785 | /* Allocate new cache page. */ |
| 786 | if (!(page = sk_stream_alloc_page(sk))) |
| 787 | goto wait_for_memory; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | } |
| 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | /* Time to copy data. We are close to |
| 791 | * the end! */ |
| 792 | err = skb_copy_to_page(sk, from, skb, page, |
| 793 | off, copy); |
| 794 | if (err) { |
| 795 | /* If this page was new, give it to the |
| 796 | * socket so it does not get leaked. |
| 797 | */ |
| 798 | if (!TCP_PAGE(sk)) { |
| 799 | TCP_PAGE(sk) = page; |
| 800 | TCP_OFF(sk) = 0; |
| 801 | } |
| 802 | goto do_error; |
| 803 | } |
| 804 | |
| 805 | /* Update the skb. */ |
| 806 | if (merge) { |
| 807 | skb_shinfo(skb)->frags[i - 1].size += |
| 808 | copy; |
| 809 | } else { |
| 810 | skb_fill_page_desc(skb, i, page, off, copy); |
| 811 | if (TCP_PAGE(sk)) { |
| 812 | get_page(page); |
| 813 | } else if (off + copy < PAGE_SIZE) { |
| 814 | get_page(page); |
| 815 | TCP_PAGE(sk) = page; |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | TCP_OFF(sk) = off + copy; |
| 820 | } |
| 821 | |
| 822 | if (!copied) |
| 823 | TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH; |
| 824 | |
| 825 | tp->write_seq += copy; |
| 826 | TCP_SKB_CB(skb)->end_seq += copy; |
| 827 | skb_shinfo(skb)->tso_segs = 0; |
| 828 | |
| 829 | from += copy; |
| 830 | copied += copy; |
| 831 | if ((seglen -= copy) == 0 && iovlen == 0) |
| 832 | goto out; |
| 833 | |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 834 | if (skb->len < mss_now || (flags & MSG_OOB)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | continue; |
| 836 | |
| 837 | if (forced_push(tp)) { |
| 838 | tcp_mark_push(tp, skb); |
| 839 | __tcp_push_pending_frames(sk, tp, mss_now, TCP_NAGLE_PUSH); |
| 840 | } else if (skb == sk->sk_send_head) |
| 841 | tcp_push_one(sk, mss_now); |
| 842 | continue; |
| 843 | |
| 844 | wait_for_sndbuf: |
| 845 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 846 | wait_for_memory: |
| 847 | if (copied) |
| 848 | tcp_push(sk, tp, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH); |
| 849 | |
| 850 | if ((err = sk_stream_wait_memory(sk, &timeo)) != 0) |
| 851 | goto do_error; |
| 852 | |
| 853 | mss_now = tcp_current_mss(sk, !(flags&MSG_OOB)); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 854 | size_goal = tp->xmit_size_goal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | } |
| 857 | |
| 858 | out: |
| 859 | if (copied) |
| 860 | tcp_push(sk, tp, flags, mss_now, tp->nonagle); |
| 861 | TCP_CHECK_TIMER(sk); |
| 862 | release_sock(sk); |
| 863 | return copied; |
| 864 | |
| 865 | do_fault: |
| 866 | if (!skb->len) { |
| 867 | if (sk->sk_send_head == skb) |
| 868 | sk->sk_send_head = NULL; |
David S. Miller | 8728b83 | 2005-08-09 19:25:21 -0700 | [diff] [blame] | 869 | __skb_unlink(skb, &sk->sk_write_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | sk_stream_free_skb(sk, skb); |
| 871 | } |
| 872 | |
| 873 | do_error: |
| 874 | if (copied) |
| 875 | goto out; |
| 876 | out_err: |
| 877 | err = sk_stream_error(sk, flags, err); |
| 878 | TCP_CHECK_TIMER(sk); |
| 879 | release_sock(sk); |
| 880 | return err; |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * Handle reading urgent data. BSD has very simple semantics for |
| 885 | * this, no blocking and very strange errors 8) |
| 886 | */ |
| 887 | |
| 888 | static int tcp_recv_urg(struct sock *sk, long timeo, |
| 889 | struct msghdr *msg, int len, int flags, |
| 890 | int *addr_len) |
| 891 | { |
| 892 | struct tcp_sock *tp = tcp_sk(sk); |
| 893 | |
| 894 | /* No URG data to read. */ |
| 895 | if (sock_flag(sk, SOCK_URGINLINE) || !tp->urg_data || |
| 896 | tp->urg_data == TCP_URG_READ) |
| 897 | return -EINVAL; /* Yes this is right ! */ |
| 898 | |
| 899 | if (sk->sk_state == TCP_CLOSE && !sock_flag(sk, SOCK_DONE)) |
| 900 | return -ENOTCONN; |
| 901 | |
| 902 | if (tp->urg_data & TCP_URG_VALID) { |
| 903 | int err = 0; |
| 904 | char c = tp->urg_data; |
| 905 | |
| 906 | if (!(flags & MSG_PEEK)) |
| 907 | tp->urg_data = TCP_URG_READ; |
| 908 | |
| 909 | /* Read urgent data. */ |
| 910 | msg->msg_flags |= MSG_OOB; |
| 911 | |
| 912 | if (len > 0) { |
| 913 | if (!(flags & MSG_TRUNC)) |
| 914 | err = memcpy_toiovec(msg->msg_iov, &c, 1); |
| 915 | len = 1; |
| 916 | } else |
| 917 | msg->msg_flags |= MSG_TRUNC; |
| 918 | |
| 919 | return err ? -EFAULT : len; |
| 920 | } |
| 921 | |
| 922 | if (sk->sk_state == TCP_CLOSE || (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 923 | return 0; |
| 924 | |
| 925 | /* Fixed the recv(..., MSG_OOB) behaviour. BSD docs and |
| 926 | * the available implementations agree in this case: |
| 927 | * this call should never block, independent of the |
| 928 | * blocking state of the socket. |
| 929 | * Mike <pall@rz.uni-karlsruhe.de> |
| 930 | */ |
| 931 | return -EAGAIN; |
| 932 | } |
| 933 | |
| 934 | /* Clean up the receive buffer for full frames taken by the user, |
| 935 | * then send an ACK if necessary. COPIED is the number of bytes |
| 936 | * tcp_recvmsg has given to the user so far, it speeds up the |
| 937 | * calculation of whether or not we must ACK for the sake of |
| 938 | * a window update. |
| 939 | */ |
| 940 | static void cleanup_rbuf(struct sock *sk, int copied) |
| 941 | { |
| 942 | struct tcp_sock *tp = tcp_sk(sk); |
| 943 | int time_to_ack = 0; |
| 944 | |
| 945 | #if TCP_DEBUG |
| 946 | struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); |
| 947 | |
| 948 | BUG_TRAP(!skb || before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq)); |
| 949 | #endif |
| 950 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 951 | if (inet_csk_ack_scheduled(sk)) { |
| 952 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | /* Delayed ACKs frequently hit locked sockets during bulk |
| 954 | * receive. */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 955 | if (icsk->icsk_ack.blocked || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | /* 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] | 957 | tp->rcv_nxt - tp->rcv_wup > icsk->icsk_ack.rcv_mss || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | /* |
| 959 | * If this read emptied read buffer, we send ACK, if |
| 960 | * connection is not bidirectional, user drained |
| 961 | * receive buffer and there was a small segment |
| 962 | * in queue. |
| 963 | */ |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 964 | (copied > 0 && (icsk->icsk_ack.pending & ICSK_ACK_PUSHED) && |
| 965 | !icsk->icsk_ack.pingpong && !atomic_read(&sk->sk_rmem_alloc))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | time_to_ack = 1; |
| 967 | } |
| 968 | |
| 969 | /* We send an ACK if we can now advertise a non-zero window |
| 970 | * which has been raised "significantly". |
| 971 | * |
| 972 | * Even if window raised up to infinity, do not send window open ACK |
| 973 | * in states, where we will not receive more. It is useless. |
| 974 | */ |
| 975 | if (copied > 0 && !time_to_ack && !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
| 976 | __u32 rcv_window_now = tcp_receive_window(tp); |
| 977 | |
| 978 | /* Optimize, __tcp_select_window() is not cheap. */ |
| 979 | if (2*rcv_window_now <= tp->window_clamp) { |
| 980 | __u32 new_window = __tcp_select_window(sk); |
| 981 | |
| 982 | /* Send ACK now, if this read freed lots of space |
| 983 | * in our buffer. Certainly, new_window is new window. |
| 984 | * We can advertise it now, if it is not less than current one. |
| 985 | * "Lots" means "at least twice" here. |
| 986 | */ |
| 987 | if (new_window && new_window >= 2 * rcv_window_now) |
| 988 | time_to_ack = 1; |
| 989 | } |
| 990 | } |
| 991 | if (time_to_ack) |
| 992 | tcp_send_ack(sk); |
| 993 | } |
| 994 | |
| 995 | static void tcp_prequeue_process(struct sock *sk) |
| 996 | { |
| 997 | struct sk_buff *skb; |
| 998 | struct tcp_sock *tp = tcp_sk(sk); |
| 999 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1000 | NET_INC_STATS_USER(LINUX_MIB_TCPPREQUEUED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | |
| 1002 | /* RX process wants to run with disabled BHs, though it is not |
| 1003 | * necessary */ |
| 1004 | local_bh_disable(); |
| 1005 | while ((skb = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) |
| 1006 | sk->sk_backlog_rcv(sk, skb); |
| 1007 | local_bh_enable(); |
| 1008 | |
| 1009 | /* Clear memory counter. */ |
| 1010 | tp->ucopy.memory = 0; |
| 1011 | } |
| 1012 | |
| 1013 | static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off) |
| 1014 | { |
| 1015 | struct sk_buff *skb; |
| 1016 | u32 offset; |
| 1017 | |
| 1018 | skb_queue_walk(&sk->sk_receive_queue, skb) { |
| 1019 | offset = seq - TCP_SKB_CB(skb)->seq; |
| 1020 | if (skb->h.th->syn) |
| 1021 | offset--; |
| 1022 | if (offset < skb->len || skb->h.th->fin) { |
| 1023 | *off = offset; |
| 1024 | return skb; |
| 1025 | } |
| 1026 | } |
| 1027 | return NULL; |
| 1028 | } |
| 1029 | |
| 1030 | /* |
| 1031 | * This routine provides an alternative to tcp_recvmsg() for routines |
| 1032 | * that would like to handle copying from skbuffs directly in 'sendfile' |
| 1033 | * fashion. |
| 1034 | * Note: |
| 1035 | * - It is assumed that the socket was locked by the caller. |
| 1036 | * - The routine does not block. |
| 1037 | * - At present, there is no support for reading OOB data |
| 1038 | * or for 'peeking' the socket using this routine |
| 1039 | * (although both would be easy to implement). |
| 1040 | */ |
| 1041 | int tcp_read_sock(struct sock *sk, read_descriptor_t *desc, |
| 1042 | sk_read_actor_t recv_actor) |
| 1043 | { |
| 1044 | struct sk_buff *skb; |
| 1045 | struct tcp_sock *tp = tcp_sk(sk); |
| 1046 | u32 seq = tp->copied_seq; |
| 1047 | u32 offset; |
| 1048 | int copied = 0; |
| 1049 | |
| 1050 | if (sk->sk_state == TCP_LISTEN) |
| 1051 | return -ENOTCONN; |
| 1052 | while ((skb = tcp_recv_skb(sk, seq, &offset)) != NULL) { |
| 1053 | if (offset < skb->len) { |
| 1054 | size_t used, len; |
| 1055 | |
| 1056 | len = skb->len - offset; |
| 1057 | /* Stop reading if we hit a patch of urgent data */ |
| 1058 | if (tp->urg_data) { |
| 1059 | u32 urg_offset = tp->urg_seq - seq; |
| 1060 | if (urg_offset < len) |
| 1061 | len = urg_offset; |
| 1062 | if (!len) |
| 1063 | break; |
| 1064 | } |
| 1065 | used = recv_actor(desc, skb, offset, len); |
| 1066 | if (used <= len) { |
| 1067 | seq += used; |
| 1068 | copied += used; |
| 1069 | offset += used; |
| 1070 | } |
| 1071 | if (offset != skb->len) |
| 1072 | break; |
| 1073 | } |
| 1074 | if (skb->h.th->fin) { |
| 1075 | sk_eat_skb(sk, skb); |
| 1076 | ++seq; |
| 1077 | break; |
| 1078 | } |
| 1079 | sk_eat_skb(sk, skb); |
| 1080 | if (!desc->count) |
| 1081 | break; |
| 1082 | } |
| 1083 | tp->copied_seq = seq; |
| 1084 | |
| 1085 | tcp_rcv_space_adjust(sk); |
| 1086 | |
| 1087 | /* Clean up data we have read: This will do ACK frames. */ |
| 1088 | if (copied) |
| 1089 | cleanup_rbuf(sk, copied); |
| 1090 | return copied; |
| 1091 | } |
| 1092 | |
| 1093 | /* |
| 1094 | * This routine copies from a sock struct into the user buffer. |
| 1095 | * |
| 1096 | * Technical note: in 2.3 we work on _locked_ socket, so that |
| 1097 | * tricks with *seq access order and skb->users are not required. |
| 1098 | * Probably, code can be easily improved even more. |
| 1099 | */ |
| 1100 | |
| 1101 | int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 1102 | size_t len, int nonblock, int flags, int *addr_len) |
| 1103 | { |
| 1104 | struct tcp_sock *tp = tcp_sk(sk); |
| 1105 | int copied = 0; |
| 1106 | u32 peek_seq; |
| 1107 | u32 *seq; |
| 1108 | unsigned long used; |
| 1109 | int err; |
| 1110 | int target; /* Read at least this many bytes */ |
| 1111 | long timeo; |
| 1112 | struct task_struct *user_recv = NULL; |
| 1113 | |
| 1114 | lock_sock(sk); |
| 1115 | |
| 1116 | TCP_CHECK_TIMER(sk); |
| 1117 | |
| 1118 | err = -ENOTCONN; |
| 1119 | if (sk->sk_state == TCP_LISTEN) |
| 1120 | goto out; |
| 1121 | |
| 1122 | timeo = sock_rcvtimeo(sk, nonblock); |
| 1123 | |
| 1124 | /* Urgent data needs to be handled specially. */ |
| 1125 | if (flags & MSG_OOB) |
| 1126 | goto recv_urg; |
| 1127 | |
| 1128 | seq = &tp->copied_seq; |
| 1129 | if (flags & MSG_PEEK) { |
| 1130 | peek_seq = tp->copied_seq; |
| 1131 | seq = &peek_seq; |
| 1132 | } |
| 1133 | |
| 1134 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
| 1135 | |
| 1136 | do { |
| 1137 | struct sk_buff *skb; |
| 1138 | u32 offset; |
| 1139 | |
| 1140 | /* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */ |
| 1141 | if (tp->urg_data && tp->urg_seq == *seq) { |
| 1142 | if (copied) |
| 1143 | break; |
| 1144 | if (signal_pending(current)) { |
| 1145 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
| 1146 | break; |
| 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | /* Next get a buffer. */ |
| 1151 | |
| 1152 | skb = skb_peek(&sk->sk_receive_queue); |
| 1153 | do { |
| 1154 | if (!skb) |
| 1155 | break; |
| 1156 | |
| 1157 | /* Now that we have two receive queues this |
| 1158 | * shouldn't happen. |
| 1159 | */ |
| 1160 | if (before(*seq, TCP_SKB_CB(skb)->seq)) { |
| 1161 | printk(KERN_INFO "recvmsg bug: copied %X " |
| 1162 | "seq %X\n", *seq, TCP_SKB_CB(skb)->seq); |
| 1163 | break; |
| 1164 | } |
| 1165 | offset = *seq - TCP_SKB_CB(skb)->seq; |
| 1166 | if (skb->h.th->syn) |
| 1167 | offset--; |
| 1168 | if (offset < skb->len) |
| 1169 | goto found_ok_skb; |
| 1170 | if (skb->h.th->fin) |
| 1171 | goto found_fin_ok; |
| 1172 | BUG_TRAP(flags & MSG_PEEK); |
| 1173 | skb = skb->next; |
| 1174 | } while (skb != (struct sk_buff *)&sk->sk_receive_queue); |
| 1175 | |
| 1176 | /* Well, if we have backlog, try to process it now yet. */ |
| 1177 | |
| 1178 | if (copied >= target && !sk->sk_backlog.tail) |
| 1179 | break; |
| 1180 | |
| 1181 | if (copied) { |
| 1182 | if (sk->sk_err || |
| 1183 | sk->sk_state == TCP_CLOSE || |
| 1184 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 1185 | !timeo || |
| 1186 | signal_pending(current) || |
| 1187 | (flags & MSG_PEEK)) |
| 1188 | break; |
| 1189 | } else { |
| 1190 | if (sock_flag(sk, SOCK_DONE)) |
| 1191 | break; |
| 1192 | |
| 1193 | if (sk->sk_err) { |
| 1194 | copied = sock_error(sk); |
| 1195 | break; |
| 1196 | } |
| 1197 | |
| 1198 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 1199 | break; |
| 1200 | |
| 1201 | if (sk->sk_state == TCP_CLOSE) { |
| 1202 | if (!sock_flag(sk, SOCK_DONE)) { |
| 1203 | /* This occurs when user tries to read |
| 1204 | * from never connected socket. |
| 1205 | */ |
| 1206 | copied = -ENOTCONN; |
| 1207 | break; |
| 1208 | } |
| 1209 | break; |
| 1210 | } |
| 1211 | |
| 1212 | if (!timeo) { |
| 1213 | copied = -EAGAIN; |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | if (signal_pending(current)) { |
| 1218 | copied = sock_intr_errno(timeo); |
| 1219 | break; |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | cleanup_rbuf(sk, copied); |
| 1224 | |
David S. Miller | 7df5512 | 2005-06-18 23:01:10 -0700 | [diff] [blame] | 1225 | if (!sysctl_tcp_low_latency && tp->ucopy.task == user_recv) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | /* Install new reader */ |
| 1227 | if (!user_recv && !(flags & (MSG_TRUNC | MSG_PEEK))) { |
| 1228 | user_recv = current; |
| 1229 | tp->ucopy.task = user_recv; |
| 1230 | tp->ucopy.iov = msg->msg_iov; |
| 1231 | } |
| 1232 | |
| 1233 | tp->ucopy.len = len; |
| 1234 | |
| 1235 | BUG_TRAP(tp->copied_seq == tp->rcv_nxt || |
| 1236 | (flags & (MSG_PEEK | MSG_TRUNC))); |
| 1237 | |
| 1238 | /* Ugly... If prequeue is not empty, we have to |
| 1239 | * process it before releasing socket, otherwise |
| 1240 | * order will be broken at second iteration. |
| 1241 | * More elegant solution is required!!! |
| 1242 | * |
| 1243 | * Look: we have the following (pseudo)queues: |
| 1244 | * |
| 1245 | * 1. packets in flight |
| 1246 | * 2. backlog |
| 1247 | * 3. prequeue |
| 1248 | * 4. receive_queue |
| 1249 | * |
| 1250 | * Each queue can be processed only if the next ones |
| 1251 | * are empty. At this point we have empty receive_queue. |
| 1252 | * But prequeue _can_ be not empty after 2nd iteration, |
| 1253 | * when we jumped to start of loop because backlog |
| 1254 | * processing added something to receive_queue. |
| 1255 | * We cannot release_sock(), because backlog contains |
| 1256 | * packets arrived _after_ prequeued ones. |
| 1257 | * |
| 1258 | * Shortly, algorithm is clear --- to process all |
| 1259 | * the queues in order. We could make it more directly, |
| 1260 | * requeueing packets from backlog to prequeue, if |
| 1261 | * is not empty. It is more elegant, but eats cycles, |
| 1262 | * unfortunately. |
| 1263 | */ |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1264 | if (!skb_queue_empty(&tp->ucopy.prequeue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | goto do_prequeue; |
| 1266 | |
| 1267 | /* __ Set realtime policy in scheduler __ */ |
| 1268 | } |
| 1269 | |
| 1270 | if (copied >= target) { |
| 1271 | /* Do not sleep, just process backlog. */ |
| 1272 | release_sock(sk); |
| 1273 | lock_sock(sk); |
| 1274 | } else |
| 1275 | sk_wait_data(sk, &timeo); |
| 1276 | |
| 1277 | if (user_recv) { |
| 1278 | int chunk; |
| 1279 | |
| 1280 | /* __ Restore normal policy in scheduler __ */ |
| 1281 | |
| 1282 | if ((chunk = len - tp->ucopy.len) != 0) { |
| 1283 | NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMBACKLOG, chunk); |
| 1284 | len -= chunk; |
| 1285 | copied += chunk; |
| 1286 | } |
| 1287 | |
| 1288 | if (tp->rcv_nxt == tp->copied_seq && |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1289 | !skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | do_prequeue: |
| 1291 | tcp_prequeue_process(sk); |
| 1292 | |
| 1293 | if ((chunk = len - tp->ucopy.len) != 0) { |
| 1294 | NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
| 1295 | len -= chunk; |
| 1296 | copied += chunk; |
| 1297 | } |
| 1298 | } |
| 1299 | } |
| 1300 | if ((flags & MSG_PEEK) && peek_seq != tp->copied_seq) { |
| 1301 | if (net_ratelimit()) |
| 1302 | printk(KERN_DEBUG "TCP(%s:%d): Application bug, race in MSG_PEEK.\n", |
| 1303 | current->comm, current->pid); |
| 1304 | peek_seq = tp->copied_seq; |
| 1305 | } |
| 1306 | continue; |
| 1307 | |
| 1308 | found_ok_skb: |
| 1309 | /* Ok so how much can we use? */ |
| 1310 | used = skb->len - offset; |
| 1311 | if (len < used) |
| 1312 | used = len; |
| 1313 | |
| 1314 | /* Do we have urgent data here? */ |
| 1315 | if (tp->urg_data) { |
| 1316 | u32 urg_offset = tp->urg_seq - *seq; |
| 1317 | if (urg_offset < used) { |
| 1318 | if (!urg_offset) { |
| 1319 | if (!sock_flag(sk, SOCK_URGINLINE)) { |
| 1320 | ++*seq; |
| 1321 | offset++; |
| 1322 | used--; |
| 1323 | if (!used) |
| 1324 | goto skip_copy; |
| 1325 | } |
| 1326 | } else |
| 1327 | used = urg_offset; |
| 1328 | } |
| 1329 | } |
| 1330 | |
| 1331 | if (!(flags & MSG_TRUNC)) { |
| 1332 | err = skb_copy_datagram_iovec(skb, offset, |
| 1333 | msg->msg_iov, used); |
| 1334 | if (err) { |
| 1335 | /* Exception. Bailout! */ |
| 1336 | if (!copied) |
| 1337 | copied = -EFAULT; |
| 1338 | break; |
| 1339 | } |
| 1340 | } |
| 1341 | |
| 1342 | *seq += used; |
| 1343 | copied += used; |
| 1344 | len -= used; |
| 1345 | |
| 1346 | tcp_rcv_space_adjust(sk); |
| 1347 | |
| 1348 | skip_copy: |
| 1349 | if (tp->urg_data && after(tp->copied_seq, tp->urg_seq)) { |
| 1350 | tp->urg_data = 0; |
| 1351 | tcp_fast_path_check(sk, tp); |
| 1352 | } |
| 1353 | if (used + offset < skb->len) |
| 1354 | continue; |
| 1355 | |
| 1356 | if (skb->h.th->fin) |
| 1357 | goto found_fin_ok; |
| 1358 | if (!(flags & MSG_PEEK)) |
| 1359 | sk_eat_skb(sk, skb); |
| 1360 | continue; |
| 1361 | |
| 1362 | found_fin_ok: |
| 1363 | /* Process the FIN. */ |
| 1364 | ++*seq; |
| 1365 | if (!(flags & MSG_PEEK)) |
| 1366 | sk_eat_skb(sk, skb); |
| 1367 | break; |
| 1368 | } while (len > 0); |
| 1369 | |
| 1370 | if (user_recv) { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1371 | if (!skb_queue_empty(&tp->ucopy.prequeue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | int chunk; |
| 1373 | |
| 1374 | tp->ucopy.len = copied > 0 ? len : 0; |
| 1375 | |
| 1376 | tcp_prequeue_process(sk); |
| 1377 | |
| 1378 | if (copied > 0 && (chunk = len - tp->ucopy.len) != 0) { |
| 1379 | NET_ADD_STATS_USER(LINUX_MIB_TCPDIRECTCOPYFROMPREQUEUE, chunk); |
| 1380 | len -= chunk; |
| 1381 | copied += chunk; |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | tp->ucopy.task = NULL; |
| 1386 | tp->ucopy.len = 0; |
| 1387 | } |
| 1388 | |
| 1389 | /* According to UNIX98, msg_name/msg_namelen are ignored |
| 1390 | * on connected socket. I was just happy when found this 8) --ANK |
| 1391 | */ |
| 1392 | |
| 1393 | /* Clean up data we have read: This will do ACK frames. */ |
| 1394 | cleanup_rbuf(sk, copied); |
| 1395 | |
| 1396 | TCP_CHECK_TIMER(sk); |
| 1397 | release_sock(sk); |
| 1398 | return copied; |
| 1399 | |
| 1400 | out: |
| 1401 | TCP_CHECK_TIMER(sk); |
| 1402 | release_sock(sk); |
| 1403 | return err; |
| 1404 | |
| 1405 | recv_urg: |
| 1406 | err = tcp_recv_urg(sk, timeo, msg, len, flags, addr_len); |
| 1407 | goto out; |
| 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * State processing on a close. This implements the state shift for |
| 1412 | * sending our FIN frame. Note that we only send a FIN for some |
| 1413 | * states. A shutdown() may have already sent the FIN, or we may be |
| 1414 | * closed. |
| 1415 | */ |
| 1416 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 1417 | static const unsigned char new_state[16] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | /* current state: new state: action: */ |
| 1419 | /* (Invalid) */ TCP_CLOSE, |
| 1420 | /* TCP_ESTABLISHED */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1421 | /* TCP_SYN_SENT */ TCP_CLOSE, |
| 1422 | /* TCP_SYN_RECV */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, |
| 1423 | /* TCP_FIN_WAIT1 */ TCP_FIN_WAIT1, |
| 1424 | /* TCP_FIN_WAIT2 */ TCP_FIN_WAIT2, |
| 1425 | /* TCP_TIME_WAIT */ TCP_CLOSE, |
| 1426 | /* TCP_CLOSE */ TCP_CLOSE, |
| 1427 | /* TCP_CLOSE_WAIT */ TCP_LAST_ACK | TCP_ACTION_FIN, |
| 1428 | /* TCP_LAST_ACK */ TCP_LAST_ACK, |
| 1429 | /* TCP_LISTEN */ TCP_CLOSE, |
| 1430 | /* TCP_CLOSING */ TCP_CLOSING, |
| 1431 | }; |
| 1432 | |
| 1433 | static int tcp_close_state(struct sock *sk) |
| 1434 | { |
| 1435 | int next = (int)new_state[sk->sk_state]; |
| 1436 | int ns = next & TCP_STATE_MASK; |
| 1437 | |
| 1438 | tcp_set_state(sk, ns); |
| 1439 | |
| 1440 | return next & TCP_ACTION_FIN; |
| 1441 | } |
| 1442 | |
| 1443 | /* |
| 1444 | * Shutdown the sending side of a connection. Much like close except |
| 1445 | * that we don't receive shut down or set_sock_flag(sk, SOCK_DEAD). |
| 1446 | */ |
| 1447 | |
| 1448 | void tcp_shutdown(struct sock *sk, int how) |
| 1449 | { |
| 1450 | /* We need to grab some memory, and put together a FIN, |
| 1451 | * and then put it into the queue to be sent. |
| 1452 | * Tim MacKenzie(tym@dibbler.cs.monash.edu.au) 4 Dec '92. |
| 1453 | */ |
| 1454 | if (!(how & SEND_SHUTDOWN)) |
| 1455 | return; |
| 1456 | |
| 1457 | /* If we've already sent a FIN, or it's a closed state, skip this. */ |
| 1458 | if ((1 << sk->sk_state) & |
| 1459 | (TCPF_ESTABLISHED | TCPF_SYN_SENT | |
| 1460 | TCPF_SYN_RECV | TCPF_CLOSE_WAIT)) { |
| 1461 | /* Clear out any half completed packets. FIN if needed. */ |
| 1462 | if (tcp_close_state(sk)) |
| 1463 | tcp_send_fin(sk); |
| 1464 | } |
| 1465 | } |
| 1466 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | void tcp_close(struct sock *sk, long timeout) |
| 1468 | { |
| 1469 | struct sk_buff *skb; |
| 1470 | int data_was_unread = 0; |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1471 | int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | |
| 1473 | lock_sock(sk); |
| 1474 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 1475 | |
| 1476 | if (sk->sk_state == TCP_LISTEN) { |
| 1477 | tcp_set_state(sk, TCP_CLOSE); |
| 1478 | |
| 1479 | /* Special case. */ |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1480 | inet_csk_listen_stop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | |
| 1482 | goto adjudge_to_death; |
| 1483 | } |
| 1484 | |
| 1485 | /* We need to flush the recv. buffs. We do this only on the |
| 1486 | * descriptor close, not protocol-sourced closes, because the |
| 1487 | * reader process may not have drained the data yet! |
| 1488 | */ |
| 1489 | while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 1490 | u32 len = TCP_SKB_CB(skb)->end_seq - TCP_SKB_CB(skb)->seq - |
| 1491 | skb->h.th->fin; |
| 1492 | data_was_unread += len; |
| 1493 | __kfree_skb(skb); |
| 1494 | } |
| 1495 | |
| 1496 | sk_stream_mem_reclaim(sk); |
| 1497 | |
| 1498 | /* As outlined in draft-ietf-tcpimpl-prob-03.txt, section |
| 1499 | * 3.10, we send a RST here because data was lost. To |
| 1500 | * witness the awful effects of the old behavior of always |
| 1501 | * doing a FIN, run an older 2.1.x kernel or 2.0.x, start |
| 1502 | * a bulk GET in an FTP client, suspend the process, wait |
| 1503 | * for the client to advertise a zero window, then kill -9 |
| 1504 | * the FTP client, wheee... Note: timeout is always zero |
| 1505 | * in such a case. |
| 1506 | */ |
| 1507 | if (data_was_unread) { |
| 1508 | /* Unread data was tossed, zap the connection. */ |
| 1509 | NET_INC_STATS_USER(LINUX_MIB_TCPABORTONCLOSE); |
| 1510 | tcp_set_state(sk, TCP_CLOSE); |
| 1511 | tcp_send_active_reset(sk, GFP_KERNEL); |
| 1512 | } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { |
| 1513 | /* Check zero linger _after_ checking for unread data. */ |
| 1514 | sk->sk_prot->disconnect(sk, 0); |
| 1515 | NET_INC_STATS_USER(LINUX_MIB_TCPABORTONDATA); |
| 1516 | } else if (tcp_close_state(sk)) { |
| 1517 | /* We FIN if the application ate all the data before |
| 1518 | * zapping the connection. |
| 1519 | */ |
| 1520 | |
| 1521 | /* RED-PEN. Formally speaking, we have broken TCP state |
| 1522 | * machine. State transitions: |
| 1523 | * |
| 1524 | * TCP_ESTABLISHED -> TCP_FIN_WAIT1 |
| 1525 | * TCP_SYN_RECV -> TCP_FIN_WAIT1 (forget it, it's impossible) |
| 1526 | * TCP_CLOSE_WAIT -> TCP_LAST_ACK |
| 1527 | * |
| 1528 | * are legal only when FIN has been sent (i.e. in window), |
| 1529 | * rather than queued out of window. Purists blame. |
| 1530 | * |
| 1531 | * F.e. "RFC state" is ESTABLISHED, |
| 1532 | * if Linux state is FIN-WAIT-1, but FIN is still not sent. |
| 1533 | * |
| 1534 | * The visible declinations are that sometimes |
| 1535 | * we enter time-wait state, when it is not required really |
| 1536 | * (harmless), do not send active resets, when they are |
| 1537 | * required by specs (TCP_ESTABLISHED, TCP_CLOSE_WAIT, when |
| 1538 | * they look as CLOSING or LAST_ACK for Linux) |
| 1539 | * Probably, I missed some more holelets. |
| 1540 | * --ANK |
| 1541 | */ |
| 1542 | tcp_send_fin(sk); |
| 1543 | } |
| 1544 | |
| 1545 | sk_stream_wait_close(sk, timeout); |
| 1546 | |
| 1547 | adjudge_to_death: |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1548 | state = sk->sk_state; |
| 1549 | sock_hold(sk); |
| 1550 | sock_orphan(sk); |
| 1551 | atomic_inc(sk->sk_prot->orphan_count); |
| 1552 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | /* It is the last release_sock in its life. It will remove backlog. */ |
| 1554 | release_sock(sk); |
| 1555 | |
| 1556 | |
| 1557 | /* Now socket is owned by kernel and we acquire BH lock |
| 1558 | to finish close. No need to check for user refs. |
| 1559 | */ |
| 1560 | local_bh_disable(); |
| 1561 | bh_lock_sock(sk); |
| 1562 | BUG_TRAP(!sock_owned_by_user(sk)); |
| 1563 | |
Herbert Xu | 75c2d907 | 2006-05-03 23:31:35 -0700 | [diff] [blame] | 1564 | /* Have we already been destroyed by a softirq or backlog? */ |
| 1565 | if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) |
| 1566 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1567 | |
| 1568 | /* This is a (useful) BSD violating of the RFC. There is a |
| 1569 | * problem with TCP as specified in that the other end could |
| 1570 | * keep a socket open forever with no application left this end. |
| 1571 | * We use a 3 minute timeout (about the same as BSD) then kill |
| 1572 | * our end. If they send after that then tough - BUT: long enough |
| 1573 | * that we won't make the old 4*rto = almost no time - whoops |
| 1574 | * reset mistake. |
| 1575 | * |
| 1576 | * Nope, it was not mistake. It is really desired behaviour |
| 1577 | * f.e. on http servers, when such sockets are useless, but |
| 1578 | * consume significant resources. Let's do it with special |
| 1579 | * linger2 option. --ANK |
| 1580 | */ |
| 1581 | |
| 1582 | if (sk->sk_state == TCP_FIN_WAIT2) { |
| 1583 | struct tcp_sock *tp = tcp_sk(sk); |
| 1584 | if (tp->linger2 < 0) { |
| 1585 | tcp_set_state(sk, TCP_CLOSE); |
| 1586 | tcp_send_active_reset(sk, GFP_ATOMIC); |
| 1587 | NET_INC_STATS_BH(LINUX_MIB_TCPABORTONLINGER); |
| 1588 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1589 | const int tmo = tcp_fin_time(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1590 | |
| 1591 | if (tmo > TCP_TIMEWAIT_LEN) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1592 | inet_csk_reset_keepalive_timer(sk, tcp_fin_time(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | tcp_time_wait(sk, TCP_FIN_WAIT2, tmo); |
| 1595 | goto out; |
| 1596 | } |
| 1597 | } |
| 1598 | } |
| 1599 | if (sk->sk_state != TCP_CLOSE) { |
| 1600 | sk_stream_mem_reclaim(sk); |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1601 | if (atomic_read(sk->sk_prot->orphan_count) > sysctl_tcp_max_orphans || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | (sk->sk_wmem_queued > SOCK_MIN_SNDBUF && |
| 1603 | atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2])) { |
| 1604 | if (net_ratelimit()) |
| 1605 | printk(KERN_INFO "TCP: too many of orphaned " |
| 1606 | "sockets\n"); |
| 1607 | tcp_set_state(sk, TCP_CLOSE); |
| 1608 | tcp_send_active_reset(sk, GFP_ATOMIC); |
| 1609 | NET_INC_STATS_BH(LINUX_MIB_TCPABORTONMEMORY); |
| 1610 | } |
| 1611 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | |
| 1613 | if (sk->sk_state == TCP_CLOSE) |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1614 | inet_csk_destroy_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | /* Otherwise, socket is reprieved until protocol close. */ |
| 1616 | |
| 1617 | out: |
| 1618 | bh_unlock_sock(sk); |
| 1619 | local_bh_enable(); |
| 1620 | sock_put(sk); |
| 1621 | } |
| 1622 | |
| 1623 | /* These states need RST on ABORT according to RFC793 */ |
| 1624 | |
| 1625 | static inline int tcp_need_reset(int state) |
| 1626 | { |
| 1627 | return (1 << state) & |
| 1628 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_FIN_WAIT1 | |
| 1629 | TCPF_FIN_WAIT2 | TCPF_SYN_RECV); |
| 1630 | } |
| 1631 | |
| 1632 | int tcp_disconnect(struct sock *sk, int flags) |
| 1633 | { |
| 1634 | struct inet_sock *inet = inet_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1635 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | struct tcp_sock *tp = tcp_sk(sk); |
| 1637 | int err = 0; |
| 1638 | int old_state = sk->sk_state; |
| 1639 | |
| 1640 | if (old_state != TCP_CLOSE) |
| 1641 | tcp_set_state(sk, TCP_CLOSE); |
| 1642 | |
| 1643 | /* ABORT function of RFC793 */ |
| 1644 | if (old_state == TCP_LISTEN) { |
Arnaldo Carvalho de Melo | 0a5578c | 2005-08-09 20:11:41 -0700 | [diff] [blame] | 1645 | inet_csk_listen_stop(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } else if (tcp_need_reset(old_state) || |
| 1647 | (tp->snd_nxt != tp->write_seq && |
| 1648 | (1 << old_state) & (TCPF_CLOSING | TCPF_LAST_ACK))) { |
Stephen Hemminger | caa20d9a | 2005-11-10 17:13:47 -0800 | [diff] [blame] | 1649 | /* The last check adjusts for discrepancy of Linux wrt. RFC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | * states |
| 1651 | */ |
| 1652 | tcp_send_active_reset(sk, gfp_any()); |
| 1653 | sk->sk_err = ECONNRESET; |
| 1654 | } else if (old_state == TCP_SYN_SENT) |
| 1655 | sk->sk_err = ECONNRESET; |
| 1656 | |
| 1657 | tcp_clear_xmit_timers(sk); |
| 1658 | __skb_queue_purge(&sk->sk_receive_queue); |
| 1659 | sk_stream_writequeue_purge(sk); |
| 1660 | __skb_queue_purge(&tp->out_of_order_queue); |
| 1661 | |
| 1662 | inet->dport = 0; |
| 1663 | |
| 1664 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 1665 | inet_reset_saddr(sk); |
| 1666 | |
| 1667 | sk->sk_shutdown = 0; |
| 1668 | sock_reset_flag(sk, SOCK_DONE); |
| 1669 | tp->srtt = 0; |
| 1670 | if ((tp->write_seq += tp->max_window + 2) == 0) |
| 1671 | tp->write_seq = 1; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1672 | icsk->icsk_backoff = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | tp->snd_cwnd = 2; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1674 | icsk->icsk_probes_out = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | tp->packets_out = 0; |
| 1676 | tp->snd_ssthresh = 0x7fffffff; |
| 1677 | tp->snd_cwnd_cnt = 0; |
Stephen Hemminger | 9772efb | 2005-11-10 17:09:53 -0800 | [diff] [blame] | 1678 | tp->bytes_acked = 0; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1679 | tcp_set_ca_state(sk, TCP_CA_Open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | tcp_clear_retrans(tp); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1681 | inet_csk_delack_init(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | sk->sk_send_head = NULL; |
| 1683 | tp->rx_opt.saw_tstamp = 0; |
| 1684 | tcp_sack_reset(&tp->rx_opt); |
| 1685 | __sk_dst_reset(sk); |
| 1686 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1687 | BUG_TRAP(!inet->num || icsk->icsk_bind_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | |
| 1689 | sk->sk_error_report(sk); |
| 1690 | return err; |
| 1691 | } |
| 1692 | |
| 1693 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | * Socket option code for TCP. |
| 1695 | */ |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1696 | static int do_tcp_setsockopt(struct sock *sk, int level, |
| 1697 | int optname, char __user *optval, int optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | { |
| 1699 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1700 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | int val; |
| 1702 | int err = 0; |
| 1703 | |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 1704 | /* This is a string value all the others are int's */ |
| 1705 | if (optname == TCP_CONGESTION) { |
| 1706 | char name[TCP_CA_NAME_MAX]; |
| 1707 | |
| 1708 | if (optlen < 1) |
| 1709 | return -EINVAL; |
| 1710 | |
| 1711 | val = strncpy_from_user(name, optval, |
| 1712 | min(TCP_CA_NAME_MAX-1, optlen)); |
| 1713 | if (val < 0) |
| 1714 | return -EFAULT; |
| 1715 | name[val] = 0; |
| 1716 | |
| 1717 | lock_sock(sk); |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1718 | err = tcp_set_congestion_control(sk, name); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 1719 | release_sock(sk); |
| 1720 | return err; |
| 1721 | } |
| 1722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | if (optlen < sizeof(int)) |
| 1724 | return -EINVAL; |
| 1725 | |
| 1726 | if (get_user(val, (int __user *)optval)) |
| 1727 | return -EFAULT; |
| 1728 | |
| 1729 | lock_sock(sk); |
| 1730 | |
| 1731 | switch (optname) { |
| 1732 | case TCP_MAXSEG: |
| 1733 | /* Values greater than interface MTU won't take effect. However |
| 1734 | * at the point when this call is done we typically don't yet |
| 1735 | * know which interface is going to be used */ |
| 1736 | if (val < 8 || val > MAX_TCP_WINDOW) { |
| 1737 | err = -EINVAL; |
| 1738 | break; |
| 1739 | } |
| 1740 | tp->rx_opt.user_mss = val; |
| 1741 | break; |
| 1742 | |
| 1743 | case TCP_NODELAY: |
| 1744 | if (val) { |
| 1745 | /* TCP_NODELAY is weaker than TCP_CORK, so that |
| 1746 | * this option on corked socket is remembered, but |
| 1747 | * it is not activated until cork is cleared. |
| 1748 | * |
| 1749 | * However, when TCP_NODELAY is set we make |
| 1750 | * an explicit push, which overrides even TCP_CORK |
| 1751 | * for currently queued segments. |
| 1752 | */ |
| 1753 | tp->nonagle |= TCP_NAGLE_OFF|TCP_NAGLE_PUSH; |
| 1754 | tcp_push_pending_frames(sk, tp); |
| 1755 | } else { |
| 1756 | tp->nonagle &= ~TCP_NAGLE_OFF; |
| 1757 | } |
| 1758 | break; |
| 1759 | |
| 1760 | case TCP_CORK: |
| 1761 | /* When set indicates to always queue non-full frames. |
| 1762 | * Later the user clears this option and we transmit |
| 1763 | * any pending partial frames in the queue. This is |
| 1764 | * meant to be used alongside sendfile() to get properly |
| 1765 | * filled frames when the user (for example) must write |
| 1766 | * out headers with a write() call first and then use |
| 1767 | * sendfile to send out the data parts. |
| 1768 | * |
| 1769 | * TCP_CORK can be set together with TCP_NODELAY and it is |
| 1770 | * stronger than TCP_NODELAY. |
| 1771 | */ |
| 1772 | if (val) { |
| 1773 | tp->nonagle |= TCP_NAGLE_CORK; |
| 1774 | } else { |
| 1775 | tp->nonagle &= ~TCP_NAGLE_CORK; |
| 1776 | if (tp->nonagle&TCP_NAGLE_OFF) |
| 1777 | tp->nonagle |= TCP_NAGLE_PUSH; |
| 1778 | tcp_push_pending_frames(sk, tp); |
| 1779 | } |
| 1780 | break; |
| 1781 | |
| 1782 | case TCP_KEEPIDLE: |
| 1783 | if (val < 1 || val > MAX_TCP_KEEPIDLE) |
| 1784 | err = -EINVAL; |
| 1785 | else { |
| 1786 | tp->keepalive_time = val * HZ; |
| 1787 | if (sock_flag(sk, SOCK_KEEPOPEN) && |
| 1788 | !((1 << sk->sk_state) & |
| 1789 | (TCPF_CLOSE | TCPF_LISTEN))) { |
| 1790 | __u32 elapsed = tcp_time_stamp - tp->rcv_tstamp; |
| 1791 | if (tp->keepalive_time > elapsed) |
| 1792 | elapsed = tp->keepalive_time - elapsed; |
| 1793 | else |
| 1794 | elapsed = 0; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1795 | inet_csk_reset_keepalive_timer(sk, elapsed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | } |
| 1797 | } |
| 1798 | break; |
| 1799 | case TCP_KEEPINTVL: |
| 1800 | if (val < 1 || val > MAX_TCP_KEEPINTVL) |
| 1801 | err = -EINVAL; |
| 1802 | else |
| 1803 | tp->keepalive_intvl = val * HZ; |
| 1804 | break; |
| 1805 | case TCP_KEEPCNT: |
| 1806 | if (val < 1 || val > MAX_TCP_KEEPCNT) |
| 1807 | err = -EINVAL; |
| 1808 | else |
| 1809 | tp->keepalive_probes = val; |
| 1810 | break; |
| 1811 | case TCP_SYNCNT: |
| 1812 | if (val < 1 || val > MAX_TCP_SYNCNT) |
| 1813 | err = -EINVAL; |
| 1814 | else |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1815 | icsk->icsk_syn_retries = val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | break; |
| 1817 | |
| 1818 | case TCP_LINGER2: |
| 1819 | if (val < 0) |
| 1820 | tp->linger2 = -1; |
| 1821 | else if (val > sysctl_tcp_fin_timeout / HZ) |
| 1822 | tp->linger2 = 0; |
| 1823 | else |
| 1824 | tp->linger2 = val * HZ; |
| 1825 | break; |
| 1826 | |
| 1827 | case TCP_DEFER_ACCEPT: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 1828 | icsk->icsk_accept_queue.rskq_defer_accept = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | if (val > 0) { |
| 1830 | /* Translate value in seconds to number of |
| 1831 | * retransmits */ |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 1832 | while (icsk->icsk_accept_queue.rskq_defer_accept < 32 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | val > ((TCP_TIMEOUT_INIT / HZ) << |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 1834 | icsk->icsk_accept_queue.rskq_defer_accept)) |
| 1835 | icsk->icsk_accept_queue.rskq_defer_accept++; |
| 1836 | icsk->icsk_accept_queue.rskq_defer_accept++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | } |
| 1838 | break; |
| 1839 | |
| 1840 | case TCP_WINDOW_CLAMP: |
| 1841 | if (!val) { |
| 1842 | if (sk->sk_state != TCP_CLOSE) { |
| 1843 | err = -EINVAL; |
| 1844 | break; |
| 1845 | } |
| 1846 | tp->window_clamp = 0; |
| 1847 | } else |
| 1848 | tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ? |
| 1849 | SOCK_MIN_RCVBUF / 2 : val; |
| 1850 | break; |
| 1851 | |
| 1852 | case TCP_QUICKACK: |
| 1853 | if (!val) { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1854 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | } else { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1856 | icsk->icsk_ack.pingpong = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | if ((1 << sk->sk_state) & |
| 1858 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT) && |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1859 | inet_csk_ack_scheduled(sk)) { |
| 1860 | icsk->icsk_ack.pending |= ICSK_ACK_PUSHED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | cleanup_rbuf(sk, 1); |
| 1862 | if (!(val & 1)) |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1863 | icsk->icsk_ack.pingpong = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | } |
| 1865 | } |
| 1866 | break; |
| 1867 | |
| 1868 | default: |
| 1869 | err = -ENOPROTOOPT; |
| 1870 | break; |
| 1871 | }; |
| 1872 | release_sock(sk); |
| 1873 | return err; |
| 1874 | } |
| 1875 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1876 | int tcp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 1877 | int optlen) |
| 1878 | { |
| 1879 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 1880 | |
| 1881 | if (level != SOL_TCP) |
| 1882 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, |
| 1883 | optval, optlen); |
| 1884 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 1885 | } |
| 1886 | |
| 1887 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1888 | int compat_tcp_setsockopt(struct sock *sk, int level, int optname, |
| 1889 | char __user *optval, int optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1890 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 1891 | if (level != SOL_TCP) |
| 1892 | return inet_csk_compat_setsockopt(sk, level, optname, |
| 1893 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1894 | return do_tcp_setsockopt(sk, level, optname, optval, optlen); |
| 1895 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 1896 | |
| 1897 | EXPORT_SYMBOL(compat_tcp_setsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1898 | #endif |
| 1899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | /* Return information about state of tcp endpoint in API format. */ |
| 1901 | void tcp_get_info(struct sock *sk, struct tcp_info *info) |
| 1902 | { |
| 1903 | struct tcp_sock *tp = tcp_sk(sk); |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1904 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | u32 now = tcp_time_stamp; |
| 1906 | |
| 1907 | memset(info, 0, sizeof(*info)); |
| 1908 | |
| 1909 | info->tcpi_state = sk->sk_state; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1910 | info->tcpi_ca_state = icsk->icsk_ca_state; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1911 | info->tcpi_retransmits = icsk->icsk_retransmits; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 1912 | info->tcpi_probes = icsk->icsk_probes_out; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1913 | info->tcpi_backoff = icsk->icsk_backoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | |
| 1915 | if (tp->rx_opt.tstamp_ok) |
| 1916 | info->tcpi_options |= TCPI_OPT_TIMESTAMPS; |
| 1917 | if (tp->rx_opt.sack_ok) |
| 1918 | info->tcpi_options |= TCPI_OPT_SACK; |
| 1919 | if (tp->rx_opt.wscale_ok) { |
| 1920 | info->tcpi_options |= TCPI_OPT_WSCALE; |
| 1921 | info->tcpi_snd_wscale = tp->rx_opt.snd_wscale; |
| 1922 | info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale; |
| 1923 | } |
| 1924 | |
| 1925 | if (tp->ecn_flags&TCP_ECN_OK) |
| 1926 | info->tcpi_options |= TCPI_OPT_ECN; |
| 1927 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1928 | info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto); |
| 1929 | info->tcpi_ato = jiffies_to_usecs(icsk->icsk_ack.ato); |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1930 | info->tcpi_snd_mss = tp->mss_cache; |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 1931 | info->tcpi_rcv_mss = icsk->icsk_ack.rcv_mss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
| 1933 | info->tcpi_unacked = tp->packets_out; |
| 1934 | info->tcpi_sacked = tp->sacked_out; |
| 1935 | info->tcpi_lost = tp->lost_out; |
| 1936 | info->tcpi_retrans = tp->retrans_out; |
| 1937 | info->tcpi_fackets = tp->fackets_out; |
| 1938 | |
| 1939 | 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] | 1940 | 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] | 1941 | info->tcpi_last_ack_recv = jiffies_to_msecs(now - tp->rcv_tstamp); |
| 1942 | |
Arnaldo Carvalho de Melo | d83d846 | 2005-12-13 23:26:10 -0800 | [diff] [blame] | 1943 | info->tcpi_pmtu = icsk->icsk_pmtu_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | info->tcpi_rcv_ssthresh = tp->rcv_ssthresh; |
| 1945 | info->tcpi_rtt = jiffies_to_usecs(tp->srtt)>>3; |
| 1946 | info->tcpi_rttvar = jiffies_to_usecs(tp->mdev)>>2; |
| 1947 | info->tcpi_snd_ssthresh = tp->snd_ssthresh; |
| 1948 | info->tcpi_snd_cwnd = tp->snd_cwnd; |
| 1949 | info->tcpi_advmss = tp->advmss; |
| 1950 | info->tcpi_reordering = tp->reordering; |
| 1951 | |
| 1952 | info->tcpi_rcv_rtt = jiffies_to_usecs(tp->rcv_rtt_est.rtt)>>3; |
| 1953 | info->tcpi_rcv_space = tp->rcvq_space.space; |
| 1954 | |
| 1955 | info->tcpi_total_retrans = tp->total_retrans; |
| 1956 | } |
| 1957 | |
| 1958 | EXPORT_SYMBOL_GPL(tcp_get_info); |
| 1959 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 1960 | static int do_tcp_getsockopt(struct sock *sk, int level, |
| 1961 | int optname, char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | { |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 1963 | struct inet_connection_sock *icsk = inet_csk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | struct tcp_sock *tp = tcp_sk(sk); |
| 1965 | int val, len; |
| 1966 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | if (get_user(len, optlen)) |
| 1968 | return -EFAULT; |
| 1969 | |
| 1970 | len = min_t(unsigned int, len, sizeof(int)); |
| 1971 | |
| 1972 | if (len < 0) |
| 1973 | return -EINVAL; |
| 1974 | |
| 1975 | switch (optname) { |
| 1976 | case TCP_MAXSEG: |
David S. Miller | c1b4a7e | 2005-07-05 15:24:38 -0700 | [diff] [blame] | 1977 | val = tp->mss_cache; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | if (!val && ((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
| 1979 | val = tp->rx_opt.user_mss; |
| 1980 | break; |
| 1981 | case TCP_NODELAY: |
| 1982 | val = !!(tp->nonagle&TCP_NAGLE_OFF); |
| 1983 | break; |
| 1984 | case TCP_CORK: |
| 1985 | val = !!(tp->nonagle&TCP_NAGLE_CORK); |
| 1986 | break; |
| 1987 | case TCP_KEEPIDLE: |
| 1988 | val = (tp->keepalive_time ? : sysctl_tcp_keepalive_time) / HZ; |
| 1989 | break; |
| 1990 | case TCP_KEEPINTVL: |
| 1991 | val = (tp->keepalive_intvl ? : sysctl_tcp_keepalive_intvl) / HZ; |
| 1992 | break; |
| 1993 | case TCP_KEEPCNT: |
| 1994 | val = tp->keepalive_probes ? : sysctl_tcp_keepalive_probes; |
| 1995 | break; |
| 1996 | case TCP_SYNCNT: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 1997 | val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | break; |
| 1999 | case TCP_LINGER2: |
| 2000 | val = tp->linger2; |
| 2001 | if (val >= 0) |
| 2002 | val = (val ? : sysctl_tcp_fin_timeout) / HZ; |
| 2003 | break; |
| 2004 | case TCP_DEFER_ACCEPT: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2005 | val = !icsk->icsk_accept_queue.rskq_defer_accept ? 0 : |
| 2006 | ((TCP_TIMEOUT_INIT / HZ) << (icsk->icsk_accept_queue.rskq_defer_accept - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2007 | break; |
| 2008 | case TCP_WINDOW_CLAMP: |
| 2009 | val = tp->window_clamp; |
| 2010 | break; |
| 2011 | case TCP_INFO: { |
| 2012 | struct tcp_info info; |
| 2013 | |
| 2014 | if (get_user(len, optlen)) |
| 2015 | return -EFAULT; |
| 2016 | |
| 2017 | tcp_get_info(sk, &info); |
| 2018 | |
| 2019 | len = min_t(unsigned int, len, sizeof(info)); |
| 2020 | if (put_user(len, optlen)) |
| 2021 | return -EFAULT; |
| 2022 | if (copy_to_user(optval, &info, len)) |
| 2023 | return -EFAULT; |
| 2024 | return 0; |
| 2025 | } |
| 2026 | case TCP_QUICKACK: |
Arnaldo Carvalho de Melo | 295f732 | 2005-08-09 20:11:56 -0700 | [diff] [blame] | 2027 | val = !icsk->icsk_ack.pingpong; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | break; |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2029 | |
| 2030 | case TCP_CONGESTION: |
| 2031 | if (get_user(len, optlen)) |
| 2032 | return -EFAULT; |
| 2033 | len = min_t(unsigned int, len, TCP_CA_NAME_MAX); |
| 2034 | if (put_user(len, optlen)) |
| 2035 | return -EFAULT; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 2036 | if (copy_to_user(optval, icsk->icsk_ca_ops->name, len)) |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2037 | return -EFAULT; |
| 2038 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | default: |
| 2040 | return -ENOPROTOOPT; |
| 2041 | }; |
| 2042 | |
| 2043 | if (put_user(len, optlen)) |
| 2044 | return -EFAULT; |
| 2045 | if (copy_to_user(optval, &val, len)) |
| 2046 | return -EFAULT; |
| 2047 | return 0; |
| 2048 | } |
| 2049 | |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2050 | int tcp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, |
| 2051 | int __user *optlen) |
| 2052 | { |
| 2053 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 2054 | |
| 2055 | if (level != SOL_TCP) |
| 2056 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, |
| 2057 | optval, optlen); |
| 2058 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2059 | } |
| 2060 | |
| 2061 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2062 | int compat_tcp_getsockopt(struct sock *sk, int level, int optname, |
| 2063 | char __user *optval, int __user *optlen) |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2064 | { |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 2065 | if (level != SOL_TCP) |
| 2066 | return inet_csk_compat_getsockopt(sk, level, optname, |
| 2067 | optval, optlen); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2068 | return do_tcp_getsockopt(sk, level, optname, optval, optlen); |
| 2069 | } |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 2070 | |
| 2071 | EXPORT_SYMBOL(compat_tcp_getsockopt); |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 2072 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | |
| 2074 | extern void __skb_cb_too_small_for_tcp(int, int); |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 2075 | extern struct tcp_congestion_ops tcp_reno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | |
| 2077 | static __initdata unsigned long thash_entries; |
| 2078 | static int __init set_thash_entries(char *str) |
| 2079 | { |
| 2080 | if (!str) |
| 2081 | return 0; |
| 2082 | thash_entries = simple_strtoul(str, &str, 0); |
| 2083 | return 1; |
| 2084 | } |
| 2085 | __setup("thash_entries=", set_thash_entries); |
| 2086 | |
| 2087 | void __init tcp_init(void) |
| 2088 | { |
| 2089 | struct sk_buff *skb = NULL; |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2090 | unsigned long limit; |
| 2091 | int order, i, max_share; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | |
| 2093 | if (sizeof(struct tcp_skb_cb) > sizeof(skb->cb)) |
| 2094 | __skb_cb_too_small_for_tcp(sizeof(struct tcp_skb_cb), |
| 2095 | sizeof(skb->cb)); |
| 2096 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2097 | tcp_hashinfo.bind_bucket_cachep = |
| 2098 | kmem_cache_create("tcp_bind_bucket", |
| 2099 | sizeof(struct inet_bind_bucket), 0, |
| 2100 | SLAB_HWCACHE_ALIGN, NULL, NULL); |
| 2101 | if (!tcp_hashinfo.bind_bucket_cachep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | panic("tcp_init: Cannot alloc tcp_bind_bucket cache."); |
| 2103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | /* Size and allocate the main established and bind bucket |
| 2105 | * hash tables. |
| 2106 | * |
| 2107 | * The methodology is similar to that of the buffer cache. |
| 2108 | */ |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2109 | tcp_hashinfo.ehash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | alloc_large_system_hash("TCP established", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2111 | sizeof(struct inet_ehash_bucket), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | thash_entries, |
| 2113 | (num_physpages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 2114 | 13 : 15, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | HASH_HIGHMEM, |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2116 | &tcp_hashinfo.ehash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2117 | NULL, |
| 2118 | 0); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2119 | tcp_hashinfo.ehash_size = (1 << tcp_hashinfo.ehash_size) >> 1; |
| 2120 | for (i = 0; i < (tcp_hashinfo.ehash_size << 1); i++) { |
| 2121 | rwlock_init(&tcp_hashinfo.ehash[i].lock); |
| 2122 | INIT_HLIST_HEAD(&tcp_hashinfo.ehash[i].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2123 | } |
| 2124 | |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2125 | tcp_hashinfo.bhash = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2126 | alloc_large_system_hash("TCP bind", |
Arnaldo Carvalho de Melo | 0f7ff92 | 2005-08-09 19:59:44 -0700 | [diff] [blame] | 2127 | sizeof(struct inet_bind_hashbucket), |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2128 | tcp_hashinfo.ehash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | (num_physpages >= 128 * 1024) ? |
Mike Stroyan | 18955cf | 2005-11-29 16:12:55 -0800 | [diff] [blame] | 2130 | 13 : 15, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | HASH_HIGHMEM, |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2132 | &tcp_hashinfo.bhash_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | NULL, |
| 2134 | 64 * 1024); |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2135 | tcp_hashinfo.bhash_size = 1 << tcp_hashinfo.bhash_size; |
| 2136 | for (i = 0; i < tcp_hashinfo.bhash_size; i++) { |
| 2137 | spin_lock_init(&tcp_hashinfo.bhash[i].lock); |
| 2138 | INIT_HLIST_HEAD(&tcp_hashinfo.bhash[i].chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | } |
| 2140 | |
| 2141 | /* Try to be a bit smarter and adjust defaults depending |
| 2142 | * on available memory. |
| 2143 | */ |
| 2144 | for (order = 0; ((1 << order) << PAGE_SHIFT) < |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2145 | (tcp_hashinfo.bhash_size * sizeof(struct inet_bind_hashbucket)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2146 | order++) |
| 2147 | ; |
Andi Kleen | e762648 | 2005-06-13 14:24:52 -0700 | [diff] [blame] | 2148 | if (order >= 4) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2149 | sysctl_local_port_range[0] = 32768; |
| 2150 | sysctl_local_port_range[1] = 61000; |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 2151 | tcp_death_row.sysctl_max_tw_buckets = 180000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | sysctl_tcp_max_orphans = 4096 << (order - 4); |
| 2153 | sysctl_max_syn_backlog = 1024; |
| 2154 | } else if (order < 3) { |
| 2155 | sysctl_local_port_range[0] = 1024 * (3 - order); |
Arnaldo Carvalho de Melo | 295ff7e | 2005-08-09 20:44:40 -0700 | [diff] [blame] | 2156 | tcp_death_row.sysctl_max_tw_buckets >>= (3 - order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | sysctl_tcp_max_orphans >>= (3 - order); |
| 2158 | sysctl_max_syn_backlog = 128; |
| 2159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
| 2161 | sysctl_tcp_mem[0] = 768 << order; |
| 2162 | sysctl_tcp_mem[1] = 1024 << order; |
| 2163 | sysctl_tcp_mem[2] = 1536 << order; |
| 2164 | |
John Heffner | 7b4f4b5 | 2006-03-25 01:34:07 -0800 | [diff] [blame] | 2165 | limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7); |
| 2166 | max_share = min(4UL*1024*1024, limit); |
| 2167 | |
| 2168 | sysctl_tcp_wmem[0] = SK_STREAM_MEM_QUANTUM; |
| 2169 | sysctl_tcp_wmem[1] = 16*1024; |
| 2170 | sysctl_tcp_wmem[2] = max(64*1024, max_share); |
| 2171 | |
| 2172 | sysctl_tcp_rmem[0] = SK_STREAM_MEM_QUANTUM; |
| 2173 | sysctl_tcp_rmem[1] = 87380; |
| 2174 | sysctl_tcp_rmem[2] = max(87380, max_share); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | |
| 2176 | printk(KERN_INFO "TCP: Hash tables configured " |
| 2177 | "(established %d bind %d)\n", |
Arnaldo Carvalho de Melo | 6e04e02 | 2005-08-09 20:07:35 -0700 | [diff] [blame] | 2178 | tcp_hashinfo.ehash_size << 1, tcp_hashinfo.bhash_size); |
Stephen Hemminger | 317a76f | 2005-06-23 12:19:55 -0700 | [diff] [blame] | 2179 | |
| 2180 | tcp_register_congestion_control(&tcp_reno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | EXPORT_SYMBOL(tcp_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | EXPORT_SYMBOL(tcp_disconnect); |
| 2185 | EXPORT_SYMBOL(tcp_getsockopt); |
| 2186 | EXPORT_SYMBOL(tcp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | EXPORT_SYMBOL(tcp_poll); |
| 2188 | EXPORT_SYMBOL(tcp_read_sock); |
| 2189 | EXPORT_SYMBOL(tcp_recvmsg); |
| 2190 | EXPORT_SYMBOL(tcp_sendmsg); |
| 2191 | EXPORT_SYMBOL(tcp_sendpage); |
| 2192 | EXPORT_SYMBOL(tcp_setsockopt); |
| 2193 | EXPORT_SYMBOL(tcp_shutdown); |
| 2194 | EXPORT_SYMBOL(tcp_statistics); |