| 1 | /* |
| 2 | * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. |
| 3 | * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. |
| 4 | * |
| 5 | * This code is derived from software contributed to The DragonFly Project |
| 6 | * by Jeffrey M. Hsu. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived |
| 18 | * from this software without specific, prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 23 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 24 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 25 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 26 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 27 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 28 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 29 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 30 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Copyright (c) 1982, 1986, 1988, 1993 |
| 36 | * The Regents of the University of California. All rights reserved. |
| 37 | * |
| 38 | * Redistribution and use in source and binary forms, with or without |
| 39 | * modification, are permitted provided that the following conditions |
| 40 | * are met: |
| 41 | * 1. Redistributions of source code must retain the above copyright |
| 42 | * notice, this list of conditions and the following disclaimer. |
| 43 | * 2. Redistributions in binary form must reproduce the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer in the |
| 45 | * documentation and/or other materials provided with the distribution. |
| 46 | * 3. Neither the name of the University nor the names of its contributors |
| 47 | * may be used to endorse or promote products derived from this software |
| 48 | * without specific prior written permission. |
| 49 | * |
| 50 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 51 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 52 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 53 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 54 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 55 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 56 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 57 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 58 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 59 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 60 | * SUCH DAMAGE. |
| 61 | * |
| 62 | * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 |
| 63 | * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ |
| 64 | */ |
| 65 | |
| 66 | #include "opt_inet.h" |
| 67 | #include "opt_inet6.h" |
| 68 | #include "opt_tcpdebug.h" |
| 69 | |
| 70 | #include <sys/param.h> |
| 71 | #include <sys/systm.h> |
| 72 | #include <sys/kernel.h> |
| 73 | #include <sys/malloc.h> |
| 74 | #include <sys/sysctl.h> |
| 75 | #include <sys/globaldata.h> |
| 76 | #include <sys/thread.h> |
| 77 | |
| 78 | #include <sys/mbuf.h> |
| 79 | #ifdef INET6 |
| 80 | #include <sys/domain.h> |
| 81 | #endif /* INET6 */ |
| 82 | #include <sys/socket.h> |
| 83 | #include <sys/socketvar.h> |
| 84 | #include <sys/socketops.h> |
| 85 | #include <sys/protosw.h> |
| 86 | #include <sys/jail.h> |
| 87 | |
| 88 | #include <sys/msgport2.h> |
| 89 | #include <sys/socketvar2.h> |
| 90 | |
| 91 | #include <net/if.h> |
| 92 | #include <net/netisr.h> |
| 93 | #include <net/route.h> |
| 94 | |
| 95 | #include <net/netmsg2.h> |
| 96 | #include <net/netisr2.h> |
| 97 | |
| 98 | #include <netinet/in.h> |
| 99 | #include <netinet/in_systm.h> |
| 100 | #ifdef INET6 |
| 101 | #include <netinet/ip6.h> |
| 102 | #endif |
| 103 | #include <netinet/in_pcb.h> |
| 104 | #ifdef INET6 |
| 105 | #include <netinet6/in6_pcb.h> |
| 106 | #endif |
| 107 | #include <netinet/in_var.h> |
| 108 | #include <netinet/ip_var.h> |
| 109 | #ifdef INET6 |
| 110 | #include <netinet6/ip6_var.h> |
| 111 | #include <netinet6/tcp6_var.h> |
| 112 | #endif |
| 113 | #include <netinet/tcp.h> |
| 114 | #include <netinet/tcp_fsm.h> |
| 115 | #include <netinet/tcp_seq.h> |
| 116 | #include <netinet/tcp_timer.h> |
| 117 | #include <netinet/tcp_timer2.h> |
| 118 | #include <netinet/tcp_var.h> |
| 119 | #include <netinet/tcpip.h> |
| 120 | #ifdef TCPDEBUG |
| 121 | #include <netinet/tcp_debug.h> |
| 122 | #endif |
| 123 | #include <machine/limits.h> |
| 124 | |
| 125 | /* |
| 126 | * Limits for TCP_KEEP* options (we will adopt the same limits that linux |
| 127 | * uses). |
| 128 | */ |
| 129 | #define MAXKEEPALIVE 32767 |
| 130 | #define MAXKEEPCNT 127 |
| 131 | |
| 132 | /* |
| 133 | * TCP protocol interface to socket abstraction. |
| 134 | */ |
| 135 | extern char *tcpstates[]; /* XXX ??? */ |
| 136 | |
| 137 | static int tcp_attach (struct socket *, struct pru_attach_info *); |
| 138 | static void tcp_connect (netmsg_t msg); |
| 139 | #ifdef INET6 |
| 140 | static void tcp6_connect (netmsg_t msg); |
| 141 | static int tcp6_connect_oncpu(struct tcpcb *tp, int flags, |
| 142 | struct mbuf **mp, |
| 143 | struct sockaddr_in6 *sin6, |
| 144 | struct in6_addr *addr6); |
| 145 | #endif /* INET6 */ |
| 146 | static struct tcpcb * |
| 147 | tcp_disconnect (struct tcpcb *); |
| 148 | static struct tcpcb * |
| 149 | tcp_usrclosed (struct tcpcb *); |
| 150 | |
| 151 | #ifdef TCPDEBUG |
| 152 | #define TCPDEBUG0 int ostate = 0 |
| 153 | #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 |
| 154 | #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ |
| 155 | tcp_trace(TA_USER, ostate, tp, 0, 0, req) |
| 156 | #else |
| 157 | #define TCPDEBUG0 |
| 158 | #define TCPDEBUG1() |
| 159 | #define TCPDEBUG2(req) |
| 160 | #endif |
| 161 | |
| 162 | /* |
| 163 | * For some ill optimized programs, which try to use TCP_NOPUSH |
| 164 | * to improve performance, will have small amount of data sits |
| 165 | * in the sending buffer. These small amount of data will _not_ |
| 166 | * be pushed into the network until more data are written into |
| 167 | * the socket or the socket write side is shutdown. |
| 168 | */ |
| 169 | static int tcp_disable_nopush = 1; |
| 170 | SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW, |
| 171 | &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect"); |
| 172 | |
| 173 | /* |
| 174 | * Allocate socket buffer space. |
| 175 | */ |
| 176 | static int |
| 177 | tcp_usr_preattach(struct socket *so, int proto __unused, |
| 178 | struct pru_attach_info *ai) |
| 179 | { |
| 180 | int error; |
| 181 | |
| 182 | if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { |
| 183 | error = soreserve(so, tcp_sendspace, tcp_recvspace, |
| 184 | ai->sb_rlimit); |
| 185 | if (error) |
| 186 | return (error); |
| 187 | } |
| 188 | atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); |
| 189 | atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE | SSB_PREALLOC); |
| 190 | |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * TCP attaches to socket via pru_attach(), reserving space, |
| 196 | * and an internet control block. This socket may move to |
| 197 | * other CPU later when we bind/connect. |
| 198 | */ |
| 199 | static void |
| 200 | tcp_usr_attach(netmsg_t msg) |
| 201 | { |
| 202 | struct socket *so = msg->base.nm_so; |
| 203 | struct pru_attach_info *ai = msg->attach.nm_ai; |
| 204 | int error; |
| 205 | struct inpcb *inp; |
| 206 | struct tcpcb *tp = NULL; |
| 207 | TCPDEBUG0; |
| 208 | |
| 209 | inp = so->so_pcb; |
| 210 | KASSERT(inp == NULL, ("tcp socket attached")); |
| 211 | TCPDEBUG1(); |
| 212 | |
| 213 | error = tcp_attach(so, ai); |
| 214 | if (error) |
| 215 | goto out; |
| 216 | |
| 217 | if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
| 218 | so->so_linger = TCP_LINGERTIME; |
| 219 | tp = sototcpcb(so); |
| 220 | out: |
| 221 | TCPDEBUG2(PRU_ATTACH); |
| 222 | lwkt_replymsg(&msg->lmsg, error); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * pru_detach() detaches the TCP protocol from the socket. |
| 227 | * If the protocol state is non-embryonic, then can't |
| 228 | * do this directly: have to initiate a pru_disconnect(), |
| 229 | * which may finish later; embryonic TCB's can just |
| 230 | * be discarded here. |
| 231 | */ |
| 232 | static void |
| 233 | tcp_usr_detach(netmsg_t msg) |
| 234 | { |
| 235 | struct socket *so = msg->base.nm_so; |
| 236 | int error = 0; |
| 237 | struct inpcb *inp; |
| 238 | struct tcpcb *tp; |
| 239 | TCPDEBUG0; |
| 240 | |
| 241 | inp = so->so_pcb; |
| 242 | |
| 243 | /* |
| 244 | * If the inp is already detached or never attached, it may have |
| 245 | * been due to an async close or async attach failure. Just return |
| 246 | * as if no error occured. |
| 247 | */ |
| 248 | if (inp) { |
| 249 | tp = intotcpcb(inp); |
| 250 | KASSERT(tp != NULL, ("tcp_usr_detach: tp is NULL")); |
| 251 | TCPDEBUG1(); |
| 252 | tp = tcp_disconnect(tp); |
| 253 | TCPDEBUG2(PRU_DETACH); |
| 254 | } |
| 255 | lwkt_replymsg(&msg->lmsg, error); |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * NOTE: ignore_error is non-zero for certain disconnection races |
| 260 | * which we want to silently allow, otherwise close() may return |
| 261 | * an unexpected error. |
| 262 | * |
| 263 | * NOTE: The variables (msg) and (tp) are assumed. |
| 264 | */ |
| 265 | #define COMMON_START(so, inp, ignore_error) \ |
| 266 | TCPDEBUG0; \ |
| 267 | \ |
| 268 | inp = so->so_pcb; \ |
| 269 | do { \ |
| 270 | if (inp == NULL) { \ |
| 271 | error = ignore_error ? 0 : EINVAL; \ |
| 272 | tp = NULL; \ |
| 273 | goto out; \ |
| 274 | } \ |
| 275 | tp = intotcpcb(inp); \ |
| 276 | TCPDEBUG1(); \ |
| 277 | } while(0) |
| 278 | |
| 279 | #define COMMON_END1(req, noreply) \ |
| 280 | out: do { \ |
| 281 | TCPDEBUG2(req); \ |
| 282 | if (!(noreply)) \ |
| 283 | lwkt_replymsg(&msg->lmsg, error); \ |
| 284 | return; \ |
| 285 | } while(0) |
| 286 | |
| 287 | #define COMMON_END(req) COMMON_END1((req), 0) |
| 288 | |
| 289 | static void |
| 290 | tcp_sosetport(struct lwkt_msg *msg, lwkt_port_t port) |
| 291 | { |
| 292 | sosetport(((struct netmsg_base *)msg)->nm_so, port); |
| 293 | } |
| 294 | |
| 295 | /* |
| 296 | * Give the socket an address. |
| 297 | */ |
| 298 | static void |
| 299 | tcp_usr_bind(netmsg_t msg) |
| 300 | { |
| 301 | struct socket *so = msg->bind.base.nm_so; |
| 302 | struct sockaddr *nam = msg->bind.nm_nam; |
| 303 | struct thread *td = msg->bind.nm_td; |
| 304 | int error = 0; |
| 305 | struct inpcb *inp; |
| 306 | struct tcpcb *tp; |
| 307 | struct sockaddr_in *sinp; |
| 308 | lwkt_port_t port0 = netisr_cpuport(0); |
| 309 | |
| 310 | COMMON_START(so, inp, 0); |
| 311 | |
| 312 | /* |
| 313 | * Must check for multicast addresses and disallow binding |
| 314 | * to them. |
| 315 | */ |
| 316 | sinp = (struct sockaddr_in *)nam; |
| 317 | if (sinp->sin_family == AF_INET && |
| 318 | IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 319 | error = EAFNOSUPPORT; |
| 320 | goto out; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Check "already bound" here (in_pcbbind() does the same check |
| 325 | * though), so we don't forward a connected socket to netisr0, |
| 326 | * which would panic in the following in_pcbunlink(). |
| 327 | */ |
| 328 | if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY) { |
| 329 | error = EINVAL; /* already bound */ |
| 330 | goto out; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Use netisr0 to serialize in_pcbbind(), so that pru_detach and |
| 335 | * pru_bind for different sockets on the same local port could be |
| 336 | * properly ordered. The original race is illustrated here for |
| 337 | * reference. |
| 338 | * |
| 339 | * s1 = socket(); |
| 340 | * bind(s1, *.PORT); |
| 341 | * close(s1); <----- asynchronous |
| 342 | * s2 = socket(); |
| 343 | * bind(s2, *.PORT); |
| 344 | * |
| 345 | * All will expect bind(s2, *.PORT) to succeed. However, it will |
| 346 | * fail, if following sequence happens due to random socket initial |
| 347 | * msgport and asynchronous close(2): |
| 348 | * |
| 349 | * netisrN netisrM |
| 350 | * : : |
| 351 | * : pru_bind(s2) [*.PORT is used by s1] |
| 352 | * pru_detach(s1) : |
| 353 | */ |
| 354 | if (&curthread->td_msgport != port0) { |
| 355 | lwkt_msg_t lmsg = &msg->bind.base.lmsg; |
| 356 | |
| 357 | KASSERT((msg->bind.nm_flags & PRUB_RELINK) == 0, |
| 358 | ("already asked to relink")); |
| 359 | |
| 360 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]); |
| 361 | msg->bind.nm_flags |= PRUB_RELINK; |
| 362 | |
| 363 | TCP_STATE_MIGRATE_START(tp); |
| 364 | |
| 365 | /* See the related comment in tcp_connect() */ |
| 366 | lwkt_setmsg_receipt(lmsg, tcp_sosetport); |
| 367 | lwkt_forwardmsg(port0, lmsg); |
| 368 | /* msg invalid now */ |
| 369 | return; |
| 370 | } |
| 371 | KASSERT(so->so_port == port0, ("so_port is not netisr0")); |
| 372 | |
| 373 | if (msg->bind.nm_flags & PRUB_RELINK) { |
| 374 | msg->bind.nm_flags &= ~PRUB_RELINK; |
| 375 | TCP_STATE_MIGRATE_END(tp); |
| 376 | in_pcblink(so->so_pcb, &tcbinfo[mycpuid]); |
| 377 | } |
| 378 | KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0")); |
| 379 | |
| 380 | error = in_pcbbind(inp, nam, td); |
| 381 | if (error) |
| 382 | goto out; |
| 383 | |
| 384 | COMMON_END(PRU_BIND); |
| 385 | } |
| 386 | |
| 387 | #ifdef INET6 |
| 388 | |
| 389 | static void |
| 390 | tcp6_usr_bind(netmsg_t msg) |
| 391 | { |
| 392 | struct socket *so = msg->bind.base.nm_so; |
| 393 | struct sockaddr *nam = msg->bind.nm_nam; |
| 394 | struct thread *td = msg->bind.nm_td; |
| 395 | int error = 0; |
| 396 | struct inpcb *inp; |
| 397 | struct tcpcb *tp; |
| 398 | struct sockaddr_in6 *sin6p; |
| 399 | |
| 400 | COMMON_START(so, inp, 0); |
| 401 | |
| 402 | /* |
| 403 | * Must check for multicast addresses and disallow binding |
| 404 | * to them. |
| 405 | */ |
| 406 | sin6p = (struct sockaddr_in6 *)nam; |
| 407 | if (sin6p->sin6_family == AF_INET6 && |
| 408 | IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 409 | error = EAFNOSUPPORT; |
| 410 | goto out; |
| 411 | } |
| 412 | error = in6_pcbbind(inp, nam, td); |
| 413 | if (error) |
| 414 | goto out; |
| 415 | COMMON_END(PRU_BIND); |
| 416 | } |
| 417 | #endif /* INET6 */ |
| 418 | |
| 419 | struct netmsg_inswildcard { |
| 420 | struct netmsg_base base; |
| 421 | struct inpcb *nm_inp; |
| 422 | }; |
| 423 | |
| 424 | static void |
| 425 | in_pcbinswildcardhash_handler(netmsg_t msg) |
| 426 | { |
| 427 | struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg; |
| 428 | int cpu = mycpuid, nextcpu; |
| 429 | |
| 430 | in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]); |
| 431 | |
| 432 | nextcpu = cpu + 1; |
| 433 | if (nextcpu < netisr_ncpus) |
| 434 | lwkt_forwardmsg(netisr_cpuport(nextcpu), &nm->base.lmsg); |
| 435 | else |
| 436 | lwkt_replymsg(&nm->base.lmsg, 0); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Prepare to accept connections. |
| 441 | */ |
| 442 | static void |
| 443 | tcp_usr_listen(netmsg_t msg) |
| 444 | { |
| 445 | struct socket *so = msg->listen.base.nm_so; |
| 446 | struct thread *td = msg->listen.nm_td; |
| 447 | int error = 0; |
| 448 | struct inpcb *inp; |
| 449 | struct tcpcb *tp; |
| 450 | struct netmsg_inswildcard nm; |
| 451 | lwkt_port_t port0 = netisr_cpuport(0); |
| 452 | |
| 453 | COMMON_START(so, inp, 0); |
| 454 | |
| 455 | if (&curthread->td_msgport != port0) { |
| 456 | lwkt_msg_t lmsg = &msg->listen.base.lmsg; |
| 457 | |
| 458 | KASSERT((msg->listen.nm_flags & PRUL_RELINK) == 0, |
| 459 | ("already asked to relink")); |
| 460 | |
| 461 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpuid]); |
| 462 | msg->listen.nm_flags |= PRUL_RELINK; |
| 463 | |
| 464 | TCP_STATE_MIGRATE_START(tp); |
| 465 | |
| 466 | /* See the related comment in tcp_connect() */ |
| 467 | lwkt_setmsg_receipt(lmsg, tcp_sosetport); |
| 468 | lwkt_forwardmsg(port0, lmsg); |
| 469 | /* msg invalid now */ |
| 470 | return; |
| 471 | } |
| 472 | KASSERT(so->so_port == port0, ("so_port is not netisr0")); |
| 473 | |
| 474 | if (msg->listen.nm_flags & PRUL_RELINK) { |
| 475 | msg->listen.nm_flags &= ~PRUL_RELINK; |
| 476 | TCP_STATE_MIGRATE_END(tp); |
| 477 | in_pcblink(so->so_pcb, &tcbinfo[mycpuid]); |
| 478 | } |
| 479 | KASSERT(inp->inp_pcbinfo == &tcbinfo[0], ("pcbinfo is not tcbinfo0")); |
| 480 | |
| 481 | if (tp->t_flags & TF_LISTEN) |
| 482 | goto out; |
| 483 | |
| 484 | if (inp->inp_lport == 0) { |
| 485 | error = in_pcbbind(inp, NULL, td); |
| 486 | if (error) |
| 487 | goto out; |
| 488 | } |
| 489 | |
| 490 | TCP_STATE_CHANGE(tp, TCPS_LISTEN); |
| 491 | tp->t_flags |= TF_LISTEN; |
| 492 | tp->tt_msg = NULL; /* Catch any invalid timer usage */ |
| 493 | |
| 494 | /* |
| 495 | * Create tcpcb per-cpu port cache |
| 496 | * |
| 497 | * NOTE: |
| 498 | * This _must_ be done before installing this inpcb into |
| 499 | * wildcard hash. |
| 500 | */ |
| 501 | tcp_pcbport_create(tp); |
| 502 | |
| 503 | if (netisr_ncpus > 1) { |
| 504 | /* |
| 505 | * Put this inpcb into wildcard hash on other cpus. |
| 506 | */ |
| 507 | ASSERT_INP_NOTINHASH(inp); |
| 508 | netmsg_init(&nm.base, NULL, &curthread->td_msgport, |
| 509 | MSGF_PRIORITY, in_pcbinswildcardhash_handler); |
| 510 | nm.nm_inp = inp; |
| 511 | lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); |
| 512 | } |
| 513 | in_pcbinswildcardhash(inp); |
| 514 | COMMON_END(PRU_LISTEN); |
| 515 | } |
| 516 | |
| 517 | #ifdef INET6 |
| 518 | |
| 519 | static void |
| 520 | tcp6_usr_listen(netmsg_t msg) |
| 521 | { |
| 522 | struct socket *so = msg->listen.base.nm_so; |
| 523 | struct thread *td = msg->listen.nm_td; |
| 524 | int error = 0; |
| 525 | struct inpcb *inp; |
| 526 | struct tcpcb *tp; |
| 527 | struct netmsg_inswildcard nm; |
| 528 | |
| 529 | COMMON_START(so, inp, 0); |
| 530 | |
| 531 | if (tp->t_flags & TF_LISTEN) |
| 532 | goto out; |
| 533 | |
| 534 | if (inp->inp_lport == 0) { |
| 535 | error = in6_pcbbind(inp, NULL, td); |
| 536 | if (error) |
| 537 | goto out; |
| 538 | } |
| 539 | |
| 540 | TCP_STATE_CHANGE(tp, TCPS_LISTEN); |
| 541 | tp->t_flags |= TF_LISTEN; |
| 542 | tp->tt_msg = NULL; /* Catch any invalid timer usage */ |
| 543 | |
| 544 | /* |
| 545 | * Create tcpcb per-cpu port cache |
| 546 | * |
| 547 | * NOTE: |
| 548 | * This _must_ be done before installing this inpcb into |
| 549 | * wildcard hash. |
| 550 | */ |
| 551 | tcp_pcbport_create(tp); |
| 552 | |
| 553 | if (netisr_ncpus > 1) { |
| 554 | /* |
| 555 | * Put this inpcb into wildcard hash on other cpus. |
| 556 | */ |
| 557 | KKASSERT(so->so_port == netisr_cpuport(0)); |
| 558 | ASSERT_NETISR0; |
| 559 | KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); |
| 560 | ASSERT_INP_NOTINHASH(inp); |
| 561 | |
| 562 | netmsg_init(&nm.base, NULL, &curthread->td_msgport, |
| 563 | MSGF_PRIORITY, in_pcbinswildcardhash_handler); |
| 564 | nm.nm_inp = inp; |
| 565 | lwkt_domsg(netisr_cpuport(1), &nm.base.lmsg, 0); |
| 566 | } |
| 567 | in_pcbinswildcardhash(inp); |
| 568 | COMMON_END(PRU_LISTEN); |
| 569 | } |
| 570 | #endif /* INET6 */ |
| 571 | |
| 572 | /* |
| 573 | * Initiate connection to peer. |
| 574 | * Create a template for use in transmissions on this connection. |
| 575 | * Enter SYN_SENT state, and mark socket as connecting. |
| 576 | * Start keep-alive timer, and seed output sequence space. |
| 577 | * Send initial segment on connection. |
| 578 | */ |
| 579 | static void |
| 580 | tcp_usr_connect(netmsg_t msg) |
| 581 | { |
| 582 | struct socket *so = msg->connect.base.nm_so; |
| 583 | struct sockaddr *nam = msg->connect.nm_nam; |
| 584 | struct thread *td = msg->connect.nm_td; |
| 585 | int error = 0; |
| 586 | struct inpcb *inp; |
| 587 | struct tcpcb *tp; |
| 588 | struct sockaddr_in *sinp; |
| 589 | |
| 590 | ASSERT_NETISR_NCPUS(mycpuid); |
| 591 | |
| 592 | COMMON_START(so, inp, 0); |
| 593 | |
| 594 | /* |
| 595 | * Must disallow TCP ``connections'' to multicast addresses. |
| 596 | */ |
| 597 | sinp = (struct sockaddr_in *)nam; |
| 598 | if (sinp->sin_family == AF_INET |
| 599 | && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 600 | error = EAFNOSUPPORT; |
| 601 | goto out; |
| 602 | } |
| 603 | tcp_connect(msg); |
| 604 | /* msg is invalid now */ |
| 605 | return; |
| 606 | out: |
| 607 | if (msg->connect.nm_m) { |
| 608 | m_freem(msg->connect.nm_m); |
| 609 | msg->connect.nm_m = NULL; |
| 610 | } |
| 611 | if (msg->connect.nm_flags & PRUC_HELDTD) |
| 612 | lwkt_rele(td); |
| 613 | if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { |
| 614 | so->so_error = error; |
| 615 | soisdisconnected(so); |
| 616 | } |
| 617 | lwkt_replymsg(&msg->lmsg, error); |
| 618 | } |
| 619 | |
| 620 | #ifdef INET6 |
| 621 | |
| 622 | static void |
| 623 | tcp6_usr_connect(netmsg_t msg) |
| 624 | { |
| 625 | struct socket *so = msg->connect.base.nm_so; |
| 626 | struct sockaddr *nam = msg->connect.nm_nam; |
| 627 | struct thread *td = msg->connect.nm_td; |
| 628 | int error = 0; |
| 629 | struct inpcb *inp; |
| 630 | struct tcpcb *tp; |
| 631 | struct sockaddr_in6 *sin6p; |
| 632 | |
| 633 | ASSERT_NETISR_NCPUS(mycpuid); |
| 634 | |
| 635 | COMMON_START(so, inp, 0); |
| 636 | |
| 637 | /* |
| 638 | * Must disallow TCP ``connections'' to multicast addresses. |
| 639 | */ |
| 640 | sin6p = (struct sockaddr_in6 *)nam; |
| 641 | if (sin6p->sin6_family == AF_INET6 |
| 642 | && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 643 | error = EAFNOSUPPORT; |
| 644 | goto out; |
| 645 | } |
| 646 | |
| 647 | if (!prison_remote_ip(td, nam)) { |
| 648 | error = EAFNOSUPPORT; /* Illegal jail IP */ |
| 649 | goto out; |
| 650 | } |
| 651 | |
| 652 | /* Reject v4-mapped address */ |
| 653 | if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { |
| 654 | error = EADDRNOTAVAIL; |
| 655 | goto out; |
| 656 | } |
| 657 | |
| 658 | inp->inp_inc.inc_isipv6 = 1; |
| 659 | tcp6_connect(msg); |
| 660 | /* msg is invalid now */ |
| 661 | return; |
| 662 | out: |
| 663 | if (msg->connect.nm_m) { |
| 664 | m_freem(msg->connect.nm_m); |
| 665 | msg->connect.nm_m = NULL; |
| 666 | } |
| 667 | lwkt_replymsg(&msg->lmsg, error); |
| 668 | } |
| 669 | |
| 670 | #endif /* INET6 */ |
| 671 | |
| 672 | /* |
| 673 | * Initiate disconnect from peer. |
| 674 | * If connection never passed embryonic stage, just drop; |
| 675 | * else if don't need to let data drain, then can just drop anyways, |
| 676 | * else have to begin TCP shutdown process: mark socket disconnecting, |
| 677 | * drain unread data, state switch to reflect user close, and |
| 678 | * send segment (e.g. FIN) to peer. Socket will be really disconnected |
| 679 | * when peer sends FIN and acks ours. |
| 680 | * |
| 681 | * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. |
| 682 | */ |
| 683 | static void |
| 684 | tcp_usr_disconnect(netmsg_t msg) |
| 685 | { |
| 686 | struct socket *so = msg->disconnect.base.nm_so; |
| 687 | int error = 0; |
| 688 | struct inpcb *inp; |
| 689 | struct tcpcb *tp; |
| 690 | |
| 691 | COMMON_START(so, inp, 1); |
| 692 | tp = tcp_disconnect(tp); |
| 693 | COMMON_END(PRU_DISCONNECT); |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Accept a connection. Essentially all the work is |
| 698 | * done at higher levels; just return the address |
| 699 | * of the peer, storing through addr. |
| 700 | */ |
| 701 | static void |
| 702 | tcp_usr_accept(netmsg_t msg) |
| 703 | { |
| 704 | struct socket *so = msg->accept.base.nm_so; |
| 705 | struct sockaddr **nam = msg->accept.nm_nam; |
| 706 | int error = 0; |
| 707 | struct inpcb *inp; |
| 708 | struct tcpcb *tp = NULL; |
| 709 | TCPDEBUG0; |
| 710 | |
| 711 | inp = so->so_pcb; |
| 712 | if (so->so_state & SS_ISDISCONNECTED) { |
| 713 | error = ECONNABORTED; |
| 714 | goto out; |
| 715 | } |
| 716 | if (inp == NULL) { |
| 717 | error = EINVAL; |
| 718 | goto out; |
| 719 | } |
| 720 | |
| 721 | tp = intotcpcb(inp); |
| 722 | TCPDEBUG1(); |
| 723 | in_setpeeraddr(so, nam); |
| 724 | COMMON_END(PRU_ACCEPT); |
| 725 | } |
| 726 | |
| 727 | #ifdef INET6 |
| 728 | static void |
| 729 | tcp6_usr_accept(netmsg_t msg) |
| 730 | { |
| 731 | struct socket *so = msg->accept.base.nm_so; |
| 732 | struct sockaddr **nam = msg->accept.nm_nam; |
| 733 | int error = 0; |
| 734 | struct inpcb *inp; |
| 735 | struct tcpcb *tp = NULL; |
| 736 | TCPDEBUG0; |
| 737 | |
| 738 | inp = so->so_pcb; |
| 739 | |
| 740 | if (so->so_state & SS_ISDISCONNECTED) { |
| 741 | error = ECONNABORTED; |
| 742 | goto out; |
| 743 | } |
| 744 | if (inp == NULL) { |
| 745 | error = EINVAL; |
| 746 | goto out; |
| 747 | } |
| 748 | tp = intotcpcb(inp); |
| 749 | TCPDEBUG1(); |
| 750 | in6_setpeeraddr(so, nam); |
| 751 | COMMON_END(PRU_ACCEPT); |
| 752 | } |
| 753 | #endif /* INET6 */ |
| 754 | |
| 755 | /* |
| 756 | * Mark the connection as being incapable of further output. |
| 757 | */ |
| 758 | static void |
| 759 | tcp_usr_shutdown(netmsg_t msg) |
| 760 | { |
| 761 | struct socket *so = msg->shutdown.base.nm_so; |
| 762 | int error = 0; |
| 763 | struct inpcb *inp; |
| 764 | struct tcpcb *tp; |
| 765 | |
| 766 | COMMON_START(so, inp, 0); |
| 767 | socantsendmore(so); |
| 768 | tp = tcp_usrclosed(tp); |
| 769 | if (tp) |
| 770 | error = tcp_output(tp); |
| 771 | COMMON_END(PRU_SHUTDOWN); |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * After a receive, possibly send window update to peer. |
| 776 | */ |
| 777 | static void |
| 778 | tcp_usr_rcvd(netmsg_t msg) |
| 779 | { |
| 780 | struct socket *so = msg->rcvd.base.nm_so; |
| 781 | int error = 0, noreply = 0; |
| 782 | struct inpcb *inp; |
| 783 | struct tcpcb *tp; |
| 784 | |
| 785 | COMMON_START(so, inp, 0); |
| 786 | |
| 787 | if (msg->rcvd.nm_pru_flags & PRUR_ASYNC) { |
| 788 | noreply = 1; |
| 789 | so_async_rcvd_reply(so); |
| 790 | } |
| 791 | tcp_output(tp); |
| 792 | |
| 793 | COMMON_END1(PRU_RCVD, noreply); |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * Do a send by putting data in output queue and updating urgent |
| 798 | * marker if URG set. Possibly send more data. Unlike the other |
| 799 | * pru_*() routines, the mbuf chains are our responsibility. We |
| 800 | * must either enqueue them or free them. The other pru_* routines |
| 801 | * generally are caller-frees. |
| 802 | */ |
| 803 | static void |
| 804 | tcp_usr_send(netmsg_t msg) |
| 805 | { |
| 806 | struct socket *so = msg->send.base.nm_so; |
| 807 | int flags = msg->send.nm_flags; |
| 808 | struct mbuf *m = msg->send.nm_m; |
| 809 | int error = 0; |
| 810 | struct inpcb *inp; |
| 811 | struct tcpcb *tp; |
| 812 | TCPDEBUG0; |
| 813 | |
| 814 | KKASSERT(msg->send.nm_control == NULL); |
| 815 | KKASSERT(msg->send.nm_addr == NULL); |
| 816 | KKASSERT((flags & PRUS_FREEADDR) == 0); |
| 817 | |
| 818 | inp = so->so_pcb; |
| 819 | |
| 820 | if (inp == NULL) { |
| 821 | /* |
| 822 | * OOPS! we lost a race, the TCP session got reset after |
| 823 | * we checked SS_CANTSENDMORE, eg: while doing uiomove or a |
| 824 | * network interrupt in the non-critical section of sosend(). |
| 825 | */ |
| 826 | m_freem(m); |
| 827 | error = ECONNRESET; /* XXX EPIPE? */ |
| 828 | tp = NULL; |
| 829 | TCPDEBUG1(); |
| 830 | goto out; |
| 831 | } |
| 832 | tp = intotcpcb(inp); |
| 833 | TCPDEBUG1(); |
| 834 | |
| 835 | #ifdef foo |
| 836 | /* |
| 837 | * This is no longer necessary, since: |
| 838 | * - sosendtcp() has already checked it for us |
| 839 | * - It does not work with asynchronized send |
| 840 | */ |
| 841 | |
| 842 | /* |
| 843 | * Don't let too much OOB data build up |
| 844 | */ |
| 845 | if (flags & PRUS_OOB) { |
| 846 | if (ssb_space(&so->so_snd) < -512) { |
| 847 | m_freem(m); |
| 848 | error = ENOBUFS; |
| 849 | goto out; |
| 850 | } |
| 851 | } |
| 852 | #endif |
| 853 | |
| 854 | /* |
| 855 | * Pump the data into the socket. |
| 856 | */ |
| 857 | if (m) { |
| 858 | ssb_appendstream(&so->so_snd, m); |
| 859 | sowwakeup(so); |
| 860 | } |
| 861 | if (flags & PRUS_OOB) { |
| 862 | /* |
| 863 | * According to RFC961 (Assigned Protocols), |
| 864 | * the urgent pointer points to the last octet |
| 865 | * of urgent data. We continue, however, |
| 866 | * to consider it to indicate the first octet |
| 867 | * of data past the urgent section. |
| 868 | * Otherwise, snd_up should be one lower. |
| 869 | */ |
| 870 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 871 | tp->t_flags |= TF_FORCE; |
| 872 | error = tcp_output(tp); |
| 873 | tp->t_flags &= ~TF_FORCE; |
| 874 | } else { |
| 875 | if (flags & PRUS_EOF) { |
| 876 | /* |
| 877 | * Close the send side of the connection after |
| 878 | * the data is sent. |
| 879 | */ |
| 880 | socantsendmore(so); |
| 881 | tp = tcp_usrclosed(tp); |
| 882 | } |
| 883 | if (tp != NULL && !tcp_output_pending(tp)) { |
| 884 | if (flags & PRUS_MORETOCOME) |
| 885 | tp->t_flags |= TF_MORETOCOME; |
| 886 | error = tcp_output_fair(tp); |
| 887 | if (flags & PRUS_MORETOCOME) |
| 888 | tp->t_flags &= ~TF_MORETOCOME; |
| 889 | } |
| 890 | } |
| 891 | COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : |
| 892 | ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), |
| 893 | (flags & PRUS_NOREPLY)); |
| 894 | } |
| 895 | |
| 896 | /* |
| 897 | * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() |
| 898 | * will sofree() it when we return. |
| 899 | */ |
| 900 | static void |
| 901 | tcp_usr_abort(netmsg_t msg) |
| 902 | { |
| 903 | struct socket *so = msg->abort.base.nm_so; |
| 904 | int error = 0; |
| 905 | struct inpcb *inp; |
| 906 | struct tcpcb *tp; |
| 907 | |
| 908 | COMMON_START(so, inp, 1); |
| 909 | tp = tcp_drop(tp, ECONNABORTED); |
| 910 | COMMON_END(PRU_ABORT); |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Receive out-of-band data. |
| 915 | */ |
| 916 | static void |
| 917 | tcp_usr_rcvoob(netmsg_t msg) |
| 918 | { |
| 919 | struct socket *so = msg->rcvoob.base.nm_so; |
| 920 | struct mbuf *m = msg->rcvoob.nm_m; |
| 921 | int flags = msg->rcvoob.nm_flags; |
| 922 | int error = 0; |
| 923 | struct inpcb *inp; |
| 924 | struct tcpcb *tp; |
| 925 | |
| 926 | COMMON_START(so, inp, 0); |
| 927 | if ((so->so_oobmark == 0 && |
| 928 | (so->so_state & SS_RCVATMARK) == 0) || |
| 929 | so->so_options & SO_OOBINLINE || |
| 930 | tp->t_oobflags & TCPOOB_HADDATA) { |
| 931 | error = EINVAL; |
| 932 | goto out; |
| 933 | } |
| 934 | if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { |
| 935 | error = EWOULDBLOCK; |
| 936 | goto out; |
| 937 | } |
| 938 | m->m_len = 1; |
| 939 | *mtod(m, caddr_t) = tp->t_iobc; |
| 940 | if ((flags & MSG_PEEK) == 0) |
| 941 | tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); |
| 942 | COMMON_END(PRU_RCVOOB); |
| 943 | } |
| 944 | |
| 945 | static void |
| 946 | tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) |
| 947 | { |
| 948 | in_savefaddr(so, faddr); |
| 949 | } |
| 950 | |
| 951 | #ifdef INET6 |
| 952 | static void |
| 953 | tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) |
| 954 | { |
| 955 | in6_savefaddr(so, faddr); |
| 956 | } |
| 957 | #endif |
| 958 | |
| 959 | static int |
| 960 | tcp_usr_preconnect(struct socket *so, const struct sockaddr *nam, |
| 961 | struct thread *td __unused) |
| 962 | { |
| 963 | const struct sockaddr_in *sinp; |
| 964 | |
| 965 | sinp = (const struct sockaddr_in *)nam; |
| 966 | if (sinp->sin_family == AF_INET && |
| 967 | IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) |
| 968 | return EAFNOSUPPORT; |
| 969 | |
| 970 | soisconnecting(so); |
| 971 | return 0; |
| 972 | } |
| 973 | |
| 974 | /* xxx - should be const */ |
| 975 | struct pr_usrreqs tcp_usrreqs = { |
| 976 | .pru_abort = tcp_usr_abort, |
| 977 | .pru_accept = tcp_usr_accept, |
| 978 | .pru_attach = tcp_usr_attach, |
| 979 | .pru_bind = tcp_usr_bind, |
| 980 | .pru_connect = tcp_usr_connect, |
| 981 | .pru_connect2 = pr_generic_notsupp, |
| 982 | .pru_control = in_control_dispatch, |
| 983 | .pru_detach = tcp_usr_detach, |
| 984 | .pru_disconnect = tcp_usr_disconnect, |
| 985 | .pru_listen = tcp_usr_listen, |
| 986 | .pru_peeraddr = in_setpeeraddr_dispatch, |
| 987 | .pru_rcvd = tcp_usr_rcvd, |
| 988 | .pru_rcvoob = tcp_usr_rcvoob, |
| 989 | .pru_send = tcp_usr_send, |
| 990 | .pru_sense = pru_sense_null, |
| 991 | .pru_shutdown = tcp_usr_shutdown, |
| 992 | .pru_sockaddr = in_setsockaddr_dispatch, |
| 993 | .pru_sosend = sosendtcp, |
| 994 | .pru_soreceive = sorecvtcp, |
| 995 | .pru_savefaddr = tcp_usr_savefaddr, |
| 996 | .pru_preconnect = tcp_usr_preconnect, |
| 997 | .pru_preattach = tcp_usr_preattach |
| 998 | }; |
| 999 | |
| 1000 | #ifdef INET6 |
| 1001 | struct pr_usrreqs tcp6_usrreqs = { |
| 1002 | .pru_abort = tcp_usr_abort, |
| 1003 | .pru_accept = tcp6_usr_accept, |
| 1004 | .pru_attach = tcp_usr_attach, |
| 1005 | .pru_bind = tcp6_usr_bind, |
| 1006 | .pru_connect = tcp6_usr_connect, |
| 1007 | .pru_connect2 = pr_generic_notsupp, |
| 1008 | .pru_control = in6_control_dispatch, |
| 1009 | .pru_detach = tcp_usr_detach, |
| 1010 | .pru_disconnect = tcp_usr_disconnect, |
| 1011 | .pru_listen = tcp6_usr_listen, |
| 1012 | .pru_peeraddr = in6_setpeeraddr_dispatch, |
| 1013 | .pru_rcvd = tcp_usr_rcvd, |
| 1014 | .pru_rcvoob = tcp_usr_rcvoob, |
| 1015 | .pru_send = tcp_usr_send, |
| 1016 | .pru_sense = pru_sense_null, |
| 1017 | .pru_shutdown = tcp_usr_shutdown, |
| 1018 | .pru_sockaddr = in6_setsockaddr_dispatch, |
| 1019 | .pru_sosend = sosendtcp, |
| 1020 | .pru_soreceive = sorecvtcp, |
| 1021 | .pru_savefaddr = tcp6_usr_savefaddr |
| 1022 | }; |
| 1023 | #endif /* INET6 */ |
| 1024 | |
| 1025 | static int |
| 1026 | tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, |
| 1027 | const struct sockaddr_in *sin, struct sockaddr_in *if_sin, |
| 1028 | uint16_t hash) |
| 1029 | { |
| 1030 | struct inpcb *inp = tp->t_inpcb, *oinp; |
| 1031 | struct socket *so = inp->inp_socket; |
| 1032 | struct route *ro = &inp->inp_route; |
| 1033 | |
| 1034 | KASSERT(inp->inp_pcbinfo == &tcbinfo[mycpu->gd_cpuid], |
| 1035 | ("pcbinfo mismatch")); |
| 1036 | |
| 1037 | oinp = in_pcblookup_hash(inp->inp_pcbinfo, |
| 1038 | sin->sin_addr, sin->sin_port, |
| 1039 | (inp->inp_laddr.s_addr != INADDR_ANY ? |
| 1040 | inp->inp_laddr : if_sin->sin_addr), |
| 1041 | inp->inp_lport, 0, NULL); |
| 1042 | if (oinp != NULL) { |
| 1043 | m_freem(m); |
| 1044 | return (EADDRINUSE); |
| 1045 | } |
| 1046 | if (inp->inp_laddr.s_addr == INADDR_ANY) |
| 1047 | inp->inp_laddr = if_sin->sin_addr; |
| 1048 | KASSERT(inp->inp_faddr.s_addr == sin->sin_addr.s_addr, |
| 1049 | ("faddr mismatch for reconnect")); |
| 1050 | KASSERT(inp->inp_fport == sin->sin_port, |
| 1051 | ("fport mismatch for reconnect")); |
| 1052 | in_pcbinsconnhash(inp); |
| 1053 | |
| 1054 | inp->inp_flags |= INP_HASH; |
| 1055 | inp->inp_hashval = hash; |
| 1056 | |
| 1057 | /* |
| 1058 | * We are now on the inpcb's owner CPU, if the cached route was |
| 1059 | * freed because the rtentry's owner CPU is not the current CPU |
| 1060 | * (e.g. in tcp_connect()), then we try to reallocate it here with |
| 1061 | * the hope that a rtentry may be cloned from a RTF_PRCLONING |
| 1062 | * rtentry. |
| 1063 | */ |
| 1064 | if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ |
| 1065 | ro->ro_rt == NULL) { |
| 1066 | bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); |
| 1067 | ro->ro_dst.sa_family = AF_INET; |
| 1068 | ro->ro_dst.sa_len = sizeof(struct sockaddr_in); |
| 1069 | ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = |
| 1070 | sin->sin_addr; |
| 1071 | rtalloc(ro); |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Now that no more errors can occur, change the protocol processing |
| 1076 | * port to the current thread (which is the correct thread). |
| 1077 | * |
| 1078 | * Create TCP timer message now; we are on the tcpcb's owner |
| 1079 | * CPU/thread. |
| 1080 | */ |
| 1081 | tcp_create_timermsg(tp, &curthread->td_msgport); |
| 1082 | |
| 1083 | /* |
| 1084 | * Compute window scaling to request. Use a larger scaling then |
| 1085 | * needed for the initial receive buffer in case the receive buffer |
| 1086 | * gets expanded. |
| 1087 | */ |
| 1088 | if (tp->request_r_scale < TCP_MIN_WINSHIFT) |
| 1089 | tp->request_r_scale = TCP_MIN_WINSHIFT; |
| 1090 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 1091 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat |
| 1092 | ) { |
| 1093 | tp->request_r_scale++; |
| 1094 | } |
| 1095 | |
| 1096 | soisconnecting(so); |
| 1097 | tcpstat.tcps_connattempt++; |
| 1098 | TCP_STATE_CHANGE(tp, TCPS_SYN_SENT); |
| 1099 | tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); |
| 1100 | tp->iss = tcp_new_isn(tp); |
| 1101 | tcp_sendseqinit(tp); |
| 1102 | if (m) { |
| 1103 | ssb_appendstream(&so->so_snd, m); |
| 1104 | m = NULL; |
| 1105 | if (flags & PRUS_OOB) |
| 1106 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * Close the send side of the connection after |
| 1111 | * the data is sent if flagged. |
| 1112 | */ |
| 1113 | if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { |
| 1114 | socantsendmore(so); |
| 1115 | tp = tcp_usrclosed(tp); |
| 1116 | } |
| 1117 | return (tcp_output(tp)); |
| 1118 | } |
| 1119 | |
| 1120 | /* |
| 1121 | * Common subroutine to open a TCP connection to remote host specified |
| 1122 | * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local |
| 1123 | * port number if needed. Call in_pcbladdr to do the routing and to choose |
| 1124 | * a local host address (interface). |
| 1125 | * Initialize connection parameters and enter SYN-SENT state. |
| 1126 | */ |
| 1127 | static void |
| 1128 | tcp_connect(netmsg_t msg) |
| 1129 | { |
| 1130 | struct socket *so = msg->connect.base.nm_so; |
| 1131 | struct sockaddr *nam = msg->connect.nm_nam; |
| 1132 | struct thread *td = msg->connect.nm_td; |
| 1133 | struct sockaddr_in *sin = (struct sockaddr_in *)nam; |
| 1134 | struct sockaddr_in *if_sin = NULL; |
| 1135 | struct inpcb *inp; |
| 1136 | struct tcpcb *tp; |
| 1137 | int error; |
| 1138 | uint16_t hash; |
| 1139 | lwkt_port_t port; |
| 1140 | |
| 1141 | COMMON_START(so, inp, 0); |
| 1142 | |
| 1143 | /* |
| 1144 | * Reconnect our pcb if we have to |
| 1145 | */ |
| 1146 | if (msg->connect.nm_flags & PRUC_RECONNECT) { |
| 1147 | msg->connect.nm_flags &= ~PRUC_RECONNECT; |
| 1148 | TCP_STATE_MIGRATE_END(tp); |
| 1149 | in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1150 | } else { |
| 1151 | if (inp->inp_faddr.s_addr != INADDR_ANY) { |
| 1152 | error = EISCONN; |
| 1153 | if (so->so_state & SS_ISCONNECTING) |
| 1154 | error = EALREADY; |
| 1155 | goto out; |
| 1156 | } |
| 1157 | KASSERT(inp->inp_fport == 0, ("invalid fport")); |
| 1158 | } |
| 1159 | |
| 1160 | /* |
| 1161 | * Select local port, if it is not yet selected. |
| 1162 | */ |
| 1163 | if (inp->inp_lport == 0) { |
| 1164 | KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); |
| 1165 | |
| 1166 | error = in_pcbladdr(inp, nam, &if_sin, td); |
| 1167 | if (error) |
| 1168 | goto out; |
| 1169 | inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; |
| 1170 | msg->connect.nm_flags |= PRUC_HASLADDR; |
| 1171 | |
| 1172 | /* |
| 1173 | * Install faddr/fport earlier, so that when this |
| 1174 | * inpcb is installed on to the lport hash, the |
| 1175 | * 4-tuple contains correct value. |
| 1176 | * |
| 1177 | * NOTE: The faddr/fport will have to be installed |
| 1178 | * after the in_pcbladdr(), which may change them. |
| 1179 | */ |
| 1180 | inp->inp_faddr = sin->sin_addr; |
| 1181 | inp->inp_fport = sin->sin_port; |
| 1182 | |
| 1183 | error = in_pcbbind_remote(inp, nam, td); |
| 1184 | if (error) |
| 1185 | goto out; |
| 1186 | } |
| 1187 | |
| 1188 | if ((msg->connect.nm_flags & PRUC_HASLADDR) == 0) { |
| 1189 | /* |
| 1190 | * Rarely used path: |
| 1191 | * This inpcb was bound before this connect. |
| 1192 | */ |
| 1193 | error = in_pcbladdr(inp, nam, &if_sin, td); |
| 1194 | if (error) |
| 1195 | goto out; |
| 1196 | |
| 1197 | /* |
| 1198 | * Save or refresh the faddr/fport, since they may |
| 1199 | * be changed by in_pcbladdr(). |
| 1200 | */ |
| 1201 | inp->inp_faddr = sin->sin_addr; |
| 1202 | inp->inp_fport = sin->sin_port; |
| 1203 | } |
| 1204 | #ifdef INVARIANTS |
| 1205 | else { |
| 1206 | KASSERT(inp->inp_faddr.s_addr == sin->sin_addr.s_addr, |
| 1207 | ("faddr mismatch for reconnect")); |
| 1208 | KASSERT(inp->inp_fport == sin->sin_port, |
| 1209 | ("fport mismatch for reconnect")); |
| 1210 | } |
| 1211 | #endif |
| 1212 | KKASSERT(inp->inp_socket == so); |
| 1213 | |
| 1214 | hash = tcp_addrhash(sin->sin_addr.s_addr, sin->sin_port, |
| 1215 | (inp->inp_laddr.s_addr != INADDR_ANY ? |
| 1216 | inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), |
| 1217 | inp->inp_lport); |
| 1218 | port = netisr_hashport(hash); |
| 1219 | |
| 1220 | if (port != &curthread->td_msgport) { |
| 1221 | lwkt_msg_t lmsg = &msg->connect.base.lmsg; |
| 1222 | |
| 1223 | /* |
| 1224 | * in_pcbladdr() may have allocated a route entry for us |
| 1225 | * on the current CPU, but we need a route entry on the |
| 1226 | * inpcb's owner CPU, so free it here. |
| 1227 | */ |
| 1228 | in_pcbresetroute(inp); |
| 1229 | |
| 1230 | /* |
| 1231 | * We are moving the protocol processing port the socket |
| 1232 | * is on, we have to unlink here and re-link on the |
| 1233 | * target cpu. |
| 1234 | */ |
| 1235 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1236 | msg->connect.nm_flags |= PRUC_RECONNECT; |
| 1237 | msg->connect.base.nm_dispatch = tcp_connect; |
| 1238 | |
| 1239 | TCP_STATE_MIGRATE_START(tp); |
| 1240 | |
| 1241 | /* |
| 1242 | * Use message put done receipt to change this socket's |
| 1243 | * so_port, i.e. _after_ this message was put onto the |
| 1244 | * target netisr's msgport but _before_ the message could |
| 1245 | * be pulled from the target netisr's msgport, so that: |
| 1246 | * - The upper half (socket code) will not see the new |
| 1247 | * msgport before this message reaches the new msgport |
| 1248 | * and messages for this socket will be ordered. |
| 1249 | * - This message will see the new msgport, when its |
| 1250 | * handler is called in the target netisr. |
| 1251 | * |
| 1252 | * NOTE: |
| 1253 | * We MUST use messege put done receipt to change this |
| 1254 | * socket's so_port: |
| 1255 | * If we changed the so_port in this netisr after the |
| 1256 | * lwkt_forwardmsg (so messages for this socket will be |
| 1257 | * ordered) and changed the so_port in the target netisr |
| 1258 | * at the very beginning of this message's handler, we |
| 1259 | * would suffer so_port overwritten race, given this |
| 1260 | * message might be forwarded again. |
| 1261 | * |
| 1262 | * NOTE: |
| 1263 | * This mechanism depends on that the netisr's msgport |
| 1264 | * is spin msgport (currently it is :). |
| 1265 | * |
| 1266 | * If the upper half saw the new msgport before this |
| 1267 | * message reached the target netisr's msgport, the |
| 1268 | * messages sent from the upper half could reach the new |
| 1269 | * msgport before this message, thus there would be |
| 1270 | * message reordering. The worst case could be soclose() |
| 1271 | * saw the new msgport and the detach message could reach |
| 1272 | * the new msgport before this message, i.e. the inpcb |
| 1273 | * could have been destroyed when this message was still |
| 1274 | * pending on or on its way to the new msgport. Other |
| 1275 | * weird cases could also happen, e.g. inpcb->inp_pcbinfo, |
| 1276 | * since we have unlinked this inpcb from the current |
| 1277 | * pcbinfo first. |
| 1278 | */ |
| 1279 | lwkt_setmsg_receipt(lmsg, tcp_sosetport); |
| 1280 | lwkt_forwardmsg(port, lmsg); |
| 1281 | /* msg invalid now */ |
| 1282 | return; |
| 1283 | } else if (msg->connect.nm_flags & PRUC_HELDTD) { |
| 1284 | /* |
| 1285 | * The original thread is no longer needed; release it. |
| 1286 | */ |
| 1287 | lwkt_rele(td); |
| 1288 | msg->connect.nm_flags &= ~PRUC_HELDTD; |
| 1289 | } |
| 1290 | error = tcp_connect_oncpu(tp, msg->connect.nm_sndflags, |
| 1291 | msg->connect.nm_m, sin, if_sin, hash); |
| 1292 | msg->connect.nm_m = NULL; |
| 1293 | out: |
| 1294 | if (msg->connect.nm_m) { |
| 1295 | m_freem(msg->connect.nm_m); |
| 1296 | msg->connect.nm_m = NULL; |
| 1297 | } |
| 1298 | if (msg->connect.nm_flags & PRUC_HELDTD) |
| 1299 | lwkt_rele(td); |
| 1300 | if (error && (msg->connect.nm_flags & PRUC_ASYNC)) { |
| 1301 | so->so_error = error; |
| 1302 | soisdisconnected(so); |
| 1303 | } |
| 1304 | lwkt_replymsg(&msg->connect.base.lmsg, error); |
| 1305 | /* msg invalid now */ |
| 1306 | } |
| 1307 | |
| 1308 | #ifdef INET6 |
| 1309 | |
| 1310 | static void |
| 1311 | tcp6_connect(netmsg_t msg) |
| 1312 | { |
| 1313 | struct tcpcb *tp; |
| 1314 | struct socket *so = msg->connect.base.nm_so; |
| 1315 | struct sockaddr *nam = msg->connect.nm_nam; |
| 1316 | struct thread *td = msg->connect.nm_td; |
| 1317 | struct inpcb *inp; |
| 1318 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; |
| 1319 | struct in6_addr *addr6; |
| 1320 | lwkt_port_t port; |
| 1321 | int error; |
| 1322 | |
| 1323 | COMMON_START(so, inp, 0); |
| 1324 | |
| 1325 | /* |
| 1326 | * Reconnect our pcb if we have to |
| 1327 | */ |
| 1328 | if (msg->connect.nm_flags & PRUC_RECONNECT) { |
| 1329 | msg->connect.nm_flags &= ~PRUC_RECONNECT; |
| 1330 | TCP_STATE_MIGRATE_END(tp); |
| 1331 | in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1332 | } |
| 1333 | |
| 1334 | /* |
| 1335 | * Bind if we have to |
| 1336 | */ |
| 1337 | if (inp->inp_lport == 0) { |
| 1338 | error = in6_pcbbind(inp, NULL, td); |
| 1339 | if (error) |
| 1340 | goto out; |
| 1341 | } |
| 1342 | |
| 1343 | /* |
| 1344 | * Cannot simply call in_pcbconnect, because there might be an |
| 1345 | * earlier incarnation of this same connection still in |
| 1346 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 1347 | */ |
| 1348 | error = in6_pcbladdr(inp, nam, &addr6, td); |
| 1349 | if (error) |
| 1350 | goto out; |
| 1351 | |
| 1352 | port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ |
| 1353 | |
| 1354 | if (port != &curthread->td_msgport) { |
| 1355 | lwkt_msg_t lmsg = &msg->connect.base.lmsg; |
| 1356 | |
| 1357 | /* |
| 1358 | * in_pcbladdr() may have allocated a route entry for us |
| 1359 | * on the current CPU, but we need a route entry on the |
| 1360 | * inpcb's owner CPU, so free it here. |
| 1361 | */ |
| 1362 | in_pcbresetroute(inp); |
| 1363 | |
| 1364 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1365 | msg->connect.nm_flags |= PRUC_RECONNECT; |
| 1366 | msg->connect.base.nm_dispatch = tcp6_connect; |
| 1367 | |
| 1368 | TCP_STATE_MIGRATE_START(tp); |
| 1369 | |
| 1370 | /* See the related comment in tcp_connect() */ |
| 1371 | lwkt_setmsg_receipt(lmsg, tcp_sosetport); |
| 1372 | lwkt_forwardmsg(port, lmsg); |
| 1373 | /* msg invalid now */ |
| 1374 | return; |
| 1375 | } |
| 1376 | error = tcp6_connect_oncpu(tp, msg->connect.nm_sndflags, |
| 1377 | &msg->connect.nm_m, sin6, addr6); |
| 1378 | /* nm_m may still be intact */ |
| 1379 | out: |
| 1380 | if (msg->connect.nm_m) { |
| 1381 | m_freem(msg->connect.nm_m); |
| 1382 | msg->connect.nm_m = NULL; |
| 1383 | } |
| 1384 | lwkt_replymsg(&msg->connect.base.lmsg, error); |
| 1385 | /* msg invalid now */ |
| 1386 | } |
| 1387 | |
| 1388 | static int |
| 1389 | tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, |
| 1390 | struct sockaddr_in6 *sin6, struct in6_addr *addr6) |
| 1391 | { |
| 1392 | struct mbuf *m = *mp; |
| 1393 | struct inpcb *inp = tp->t_inpcb; |
| 1394 | struct socket *so = inp->inp_socket; |
| 1395 | struct inpcb *oinp; |
| 1396 | |
| 1397 | /* |
| 1398 | * Cannot simply call in_pcbconnect, because there might be an |
| 1399 | * earlier incarnation of this same connection still in |
| 1400 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 1401 | */ |
| 1402 | oinp = in6_pcblookup_hash(inp->inp_pcbinfo, |
| 1403 | &sin6->sin6_addr, sin6->sin6_port, |
| 1404 | (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? |
| 1405 | addr6 : &inp->in6p_laddr), |
| 1406 | inp->inp_lport, 0, NULL); |
| 1407 | if (oinp) |
| 1408 | return (EADDRINUSE); |
| 1409 | |
| 1410 | if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) |
| 1411 | inp->in6p_laddr = *addr6; |
| 1412 | inp->in6p_faddr = sin6->sin6_addr; |
| 1413 | inp->inp_fport = sin6->sin6_port; |
| 1414 | if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) |
| 1415 | inp->in6p_flowinfo = sin6->sin6_flowinfo; |
| 1416 | in_pcbinsconnhash(inp); |
| 1417 | |
| 1418 | /* |
| 1419 | * Now that no more errors can occur, change the protocol processing |
| 1420 | * port to the current thread (which is the correct thread). |
| 1421 | * |
| 1422 | * Create TCP timer message now; we are on the tcpcb's owner |
| 1423 | * CPU/thread. |
| 1424 | */ |
| 1425 | tcp_create_timermsg(tp, &curthread->td_msgport); |
| 1426 | |
| 1427 | /* Compute window scaling to request. */ |
| 1428 | if (tp->request_r_scale < TCP_MIN_WINSHIFT) |
| 1429 | tp->request_r_scale = TCP_MIN_WINSHIFT; |
| 1430 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 1431 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { |
| 1432 | tp->request_r_scale++; |
| 1433 | } |
| 1434 | |
| 1435 | soisconnecting(so); |
| 1436 | tcpstat.tcps_connattempt++; |
| 1437 | TCP_STATE_CHANGE(tp, TCPS_SYN_SENT); |
| 1438 | tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); |
| 1439 | tp->iss = tcp_new_isn(tp); |
| 1440 | tcp_sendseqinit(tp); |
| 1441 | if (m) { |
| 1442 | ssb_appendstream(&so->so_snd, m); |
| 1443 | *mp = NULL; |
| 1444 | if (flags & PRUS_OOB) |
| 1445 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 1446 | } |
| 1447 | |
| 1448 | /* |
| 1449 | * Close the send side of the connection after |
| 1450 | * the data is sent if flagged. |
| 1451 | */ |
| 1452 | if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { |
| 1453 | socantsendmore(so); |
| 1454 | tp = tcp_usrclosed(tp); |
| 1455 | } |
| 1456 | return (tcp_output(tp)); |
| 1457 | } |
| 1458 | |
| 1459 | #endif /* INET6 */ |
| 1460 | |
| 1461 | /* |
| 1462 | * The new sockopt interface makes it possible for us to block in the |
| 1463 | * copyin/out step (if we take a page fault). Taking a page fault while |
| 1464 | * in a critical section is probably a Bad Thing. (Since sockets and pcbs |
| 1465 | * both now use TSM, there probably isn't any need for this function to |
| 1466 | * run in a critical section any more. This needs more examination.) |
| 1467 | */ |
| 1468 | void |
| 1469 | tcp_ctloutput(netmsg_t msg) |
| 1470 | { |
| 1471 | struct socket *so = msg->base.nm_so; |
| 1472 | struct sockopt *sopt = msg->ctloutput.nm_sopt; |
| 1473 | struct thread *td = NULL; |
| 1474 | int error, opt, optval, opthz; |
| 1475 | struct inpcb *inp; |
| 1476 | struct tcpcb *tp; |
| 1477 | |
| 1478 | if (msg->ctloutput.nm_flags & PRCO_HELDTD) |
| 1479 | td = sopt->sopt_td; |
| 1480 | |
| 1481 | error = 0; |
| 1482 | inp = so->so_pcb; |
| 1483 | if (inp == NULL) { |
| 1484 | error = ECONNRESET; |
| 1485 | goto done; |
| 1486 | } |
| 1487 | tp = intotcpcb(inp); |
| 1488 | |
| 1489 | /* Get socket's owner cpuid hint */ |
| 1490 | if (sopt->sopt_level == SOL_SOCKET && |
| 1491 | sopt->sopt_dir == SOPT_GET && |
| 1492 | sopt->sopt_name == SO_CPUHINT) { |
| 1493 | if (tp->t_flags & TF_LISTEN) { |
| 1494 | /* |
| 1495 | * Listen sockets owner cpuid is always 0, |
| 1496 | * which does not make sense if SO_REUSEPORT |
| 1497 | * is not set. |
| 1498 | * |
| 1499 | * NOTE: inp_lgrpindex is _not_ assigned in jail. |
| 1500 | */ |
| 1501 | if ((so->so_options & SO_REUSEPORT) && |
| 1502 | inp->inp_lgrpindex >= 0) |
| 1503 | optval = inp->inp_lgrpindex % netisr_ncpus; |
| 1504 | else |
| 1505 | optval = -1; /* no hint */ |
| 1506 | } else { |
| 1507 | optval = mycpuid; |
| 1508 | } |
| 1509 | soopt_from_kbuf(sopt, &optval, sizeof(optval)); |
| 1510 | goto done; |
| 1511 | } |
| 1512 | |
| 1513 | if (sopt->sopt_level != IPPROTO_TCP) { |
| 1514 | if (sopt->sopt_level == IPPROTO_IP) { |
| 1515 | switch (sopt->sopt_name) { |
| 1516 | case IP_MULTICAST_IF: |
| 1517 | case IP_MULTICAST_VIF: |
| 1518 | case IP_MULTICAST_TTL: |
| 1519 | case IP_MULTICAST_LOOP: |
| 1520 | case IP_ADD_MEMBERSHIP: |
| 1521 | case IP_DROP_MEMBERSHIP: |
| 1522 | /* |
| 1523 | * Multicast does not make sense on |
| 1524 | * TCP sockets. |
| 1525 | */ |
| 1526 | error = EOPNOTSUPP; |
| 1527 | goto done; |
| 1528 | } |
| 1529 | } |
| 1530 | #ifdef INET6 |
| 1531 | if (INP_CHECK_SOCKAF(so, AF_INET6)) |
| 1532 | ip6_ctloutput_dispatch(msg); |
| 1533 | else |
| 1534 | #endif /* INET6 */ |
| 1535 | ip_ctloutput(msg); |
| 1536 | /* msg invalid now */ |
| 1537 | if (td != NULL) |
| 1538 | lwkt_rele(td); |
| 1539 | return; |
| 1540 | } |
| 1541 | |
| 1542 | switch (sopt->sopt_dir) { |
| 1543 | case SOPT_SET: |
| 1544 | error = soopt_to_kbuf(sopt, &optval, sizeof optval, |
| 1545 | sizeof optval); |
| 1546 | if (error) |
| 1547 | break; |
| 1548 | switch (sopt->sopt_name) { |
| 1549 | case TCP_FASTKEEP: |
| 1550 | if (optval > 0) |
| 1551 | tp->t_keepidle = tp->t_keepintvl; |
| 1552 | else |
| 1553 | tp->t_keepidle = tcp_keepidle; |
| 1554 | tcp_timer_keep_activity(tp, 0); |
| 1555 | break; |
| 1556 | #ifdef TCP_SIGNATURE |
| 1557 | case TCP_SIGNATURE_ENABLE: |
| 1558 | if (tp->t_state == TCPS_CLOSED) { |
| 1559 | /* |
| 1560 | * This is the only safe state that this |
| 1561 | * option could be changed. Some segments |
| 1562 | * could already have been sent in other |
| 1563 | * states. |
| 1564 | */ |
| 1565 | if (optval > 0) |
| 1566 | tp->t_flags |= TF_SIGNATURE; |
| 1567 | else |
| 1568 | tp->t_flags &= ~TF_SIGNATURE; |
| 1569 | } else { |
| 1570 | error = EOPNOTSUPP; |
| 1571 | } |
| 1572 | break; |
| 1573 | #endif /* TCP_SIGNATURE */ |
| 1574 | case TCP_NODELAY: |
| 1575 | case TCP_NOOPT: |
| 1576 | switch (sopt->sopt_name) { |
| 1577 | case TCP_NODELAY: |
| 1578 | opt = TF_NODELAY; |
| 1579 | break; |
| 1580 | case TCP_NOOPT: |
| 1581 | opt = TF_NOOPT; |
| 1582 | break; |
| 1583 | default: |
| 1584 | opt = 0; /* dead code to fool gcc */ |
| 1585 | break; |
| 1586 | } |
| 1587 | |
| 1588 | if (optval) |
| 1589 | tp->t_flags |= opt; |
| 1590 | else |
| 1591 | tp->t_flags &= ~opt; |
| 1592 | break; |
| 1593 | |
| 1594 | case TCP_NOPUSH: |
| 1595 | if (tcp_disable_nopush) |
| 1596 | break; |
| 1597 | if (optval) |
| 1598 | tp->t_flags |= TF_NOPUSH; |
| 1599 | else { |
| 1600 | tp->t_flags &= ~TF_NOPUSH; |
| 1601 | error = tcp_output(tp); |
| 1602 | } |
| 1603 | break; |
| 1604 | |
| 1605 | case TCP_MAXSEG: |
| 1606 | /* |
| 1607 | * Must be between 0 and maxseg. If the requested |
| 1608 | * maxseg is too small to satisfy the desired minmss, |
| 1609 | * pump it up (silently so sysctl modifications of |
| 1610 | * minmss do not create unexpected program failures). |
| 1611 | * Handle degenerate cases. |
| 1612 | */ |
| 1613 | if (optval > 0 && optval <= tp->t_maxseg) { |
| 1614 | if (optval + 40 < tcp_minmss) { |
| 1615 | optval = tcp_minmss - 40; |
| 1616 | if (optval < 0) |
| 1617 | optval = 1; |
| 1618 | } |
| 1619 | tp->t_maxseg = optval; |
| 1620 | } else { |
| 1621 | error = EINVAL; |
| 1622 | } |
| 1623 | break; |
| 1624 | |
| 1625 | case TCP_KEEPINIT: |
| 1626 | case TCP_KEEPIDLE: |
| 1627 | case TCP_KEEPINTVL: |
| 1628 | if (optval < 1 || optval > MAXKEEPALIVE) { |
| 1629 | error = EINVAL; |
| 1630 | break; |
| 1631 | } |
| 1632 | opthz = optval * hz; |
| 1633 | |
| 1634 | switch (sopt->sopt_name) { |
| 1635 | case TCP_KEEPINIT: |
| 1636 | tp->t_keepinit = opthz; |
| 1637 | break; |
| 1638 | case TCP_KEEPIDLE: |
| 1639 | tp->t_keepidle = opthz; |
| 1640 | tcp_timer_keep_activity(tp, 0); |
| 1641 | break; |
| 1642 | case TCP_KEEPINTVL: |
| 1643 | tp->t_keepintvl = opthz; |
| 1644 | tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; |
| 1645 | break; |
| 1646 | } |
| 1647 | break; |
| 1648 | |
| 1649 | case TCP_KEEPCNT: |
| 1650 | if (optval < 1 || optval > MAXKEEPCNT) { |
| 1651 | error = EINVAL; |
| 1652 | break; |
| 1653 | } |
| 1654 | tp->t_keepcnt = optval; |
| 1655 | tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; |
| 1656 | break; |
| 1657 | |
| 1658 | default: |
| 1659 | error = ENOPROTOOPT; |
| 1660 | break; |
| 1661 | } |
| 1662 | break; |
| 1663 | |
| 1664 | case SOPT_GET: |
| 1665 | switch (sopt->sopt_name) { |
| 1666 | #ifdef TCP_SIGNATURE |
| 1667 | case TCP_SIGNATURE_ENABLE: |
| 1668 | optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; |
| 1669 | break; |
| 1670 | #endif /* TCP_SIGNATURE */ |
| 1671 | case TCP_NODELAY: |
| 1672 | optval = tp->t_flags & TF_NODELAY; |
| 1673 | break; |
| 1674 | case TCP_MAXSEG: |
| 1675 | optval = tp->t_maxseg; |
| 1676 | break; |
| 1677 | case TCP_NOOPT: |
| 1678 | optval = tp->t_flags & TF_NOOPT; |
| 1679 | break; |
| 1680 | case TCP_NOPUSH: |
| 1681 | optval = tp->t_flags & TF_NOPUSH; |
| 1682 | break; |
| 1683 | case TCP_KEEPINIT: |
| 1684 | optval = tp->t_keepinit / hz; |
| 1685 | break; |
| 1686 | case TCP_KEEPIDLE: |
| 1687 | optval = tp->t_keepidle / hz; |
| 1688 | break; |
| 1689 | case TCP_KEEPINTVL: |
| 1690 | optval = tp->t_keepintvl / hz; |
| 1691 | break; |
| 1692 | case TCP_KEEPCNT: |
| 1693 | optval = tp->t_keepcnt; |
| 1694 | break; |
| 1695 | default: |
| 1696 | error = ENOPROTOOPT; |
| 1697 | break; |
| 1698 | } |
| 1699 | if (error == 0) |
| 1700 | soopt_from_kbuf(sopt, &optval, sizeof optval); |
| 1701 | break; |
| 1702 | } |
| 1703 | done: |
| 1704 | if (td != NULL) |
| 1705 | lwkt_rele(td); |
| 1706 | lwkt_replymsg(&msg->lmsg, error); |
| 1707 | } |
| 1708 | |
| 1709 | struct netmsg_tcp_ctloutput { |
| 1710 | struct netmsg_pr_ctloutput ctloutput; |
| 1711 | struct sockopt sopt; |
| 1712 | int sopt_val; |
| 1713 | }; |
| 1714 | |
| 1715 | /* |
| 1716 | * Allocate netmsg_pr_ctloutput for asynchronous tcp_ctloutput. |
| 1717 | */ |
| 1718 | struct netmsg_pr_ctloutput * |
| 1719 | tcp_ctloutmsg(struct sockopt *sopt) |
| 1720 | { |
| 1721 | struct netmsg_tcp_ctloutput *msg; |
| 1722 | int flags = 0, error; |
| 1723 | |
| 1724 | KASSERT(sopt->sopt_dir == SOPT_SET, ("not from ctloutput")); |
| 1725 | |
| 1726 | /* Only small set of options allows asynchronous setting. */ |
| 1727 | if (sopt->sopt_level != IPPROTO_TCP) |
| 1728 | return NULL; |
| 1729 | switch (sopt->sopt_name) { |
| 1730 | case TCP_NODELAY: |
| 1731 | case TCP_NOOPT: |
| 1732 | case TCP_NOPUSH: |
| 1733 | case TCP_FASTKEEP: |
| 1734 | break; |
| 1735 | default: |
| 1736 | return NULL; |
| 1737 | } |
| 1738 | |
| 1739 | msg = kmalloc(sizeof(*msg), M_LWKTMSG, M_WAITOK | M_NULLOK); |
| 1740 | if (msg == NULL) { |
| 1741 | /* Fallback to synchronous tcp_ctloutput */ |
| 1742 | return NULL; |
| 1743 | } |
| 1744 | |
| 1745 | /* Save the sockopt */ |
| 1746 | msg->sopt = *sopt; |
| 1747 | |
| 1748 | /* Fixup the sopt.sopt_val ptr */ |
| 1749 | error = sooptcopyin(sopt, &msg->sopt_val, |
| 1750 | sizeof(msg->sopt_val), sizeof(msg->sopt_val)); |
| 1751 | if (error) { |
| 1752 | kfree(msg, M_LWKTMSG); |
| 1753 | return NULL; |
| 1754 | } |
| 1755 | msg->sopt.sopt_val = &msg->sopt_val; |
| 1756 | |
| 1757 | /* Hold the current thread */ |
| 1758 | if (msg->sopt.sopt_td != NULL) { |
| 1759 | flags |= PRCO_HELDTD; |
| 1760 | lwkt_hold(msg->sopt.sopt_td); |
| 1761 | } |
| 1762 | |
| 1763 | msg->ctloutput.nm_flags = flags; |
| 1764 | msg->ctloutput.nm_sopt = &msg->sopt; |
| 1765 | |
| 1766 | return &msg->ctloutput; |
| 1767 | } |
| 1768 | |
| 1769 | /* |
| 1770 | * tcp_sendspace and tcp_recvspace are the default send and receive window |
| 1771 | * sizes, respectively. These are obsolescent (this information should |
| 1772 | * be set by the route). |
| 1773 | * |
| 1774 | * Use a default that does not require tcp window scaling to be turned |
| 1775 | * on. Individual programs or the administrator can increase the default. |
| 1776 | */ |
| 1777 | u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ |
| 1778 | SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, |
| 1779 | &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); |
| 1780 | u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ |
| 1781 | SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, |
| 1782 | &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); |
| 1783 | |
| 1784 | /* |
| 1785 | * Attach TCP protocol to socket, allocating internet protocol control |
| 1786 | * block, tcp control block, buffer space, and entering CLOSED state. |
| 1787 | */ |
| 1788 | static int |
| 1789 | tcp_attach(struct socket *so, struct pru_attach_info *ai) |
| 1790 | { |
| 1791 | struct inpcb *inp; |
| 1792 | int error; |
| 1793 | int cpu; |
| 1794 | #ifdef INET6 |
| 1795 | boolean_t isipv6 = INP_CHECK_SOCKAF(so, AF_INET6); |
| 1796 | #endif |
| 1797 | |
| 1798 | if (ai != NULL) { |
| 1799 | error = tcp_usr_preattach(so, 0 /* don't care */, ai); |
| 1800 | if (error) |
| 1801 | return (error); |
| 1802 | } else { |
| 1803 | /* Post attach; do nothing */ |
| 1804 | } |
| 1805 | |
| 1806 | cpu = mycpu->gd_cpuid; |
| 1807 | |
| 1808 | /* |
| 1809 | * Set the default pcbinfo. This will likely change when we |
| 1810 | * bind/connect. |
| 1811 | */ |
| 1812 | error = in_pcballoc(so, &tcbinfo[cpu]); |
| 1813 | if (error) |
| 1814 | return (error); |
| 1815 | inp = so->so_pcb; |
| 1816 | #ifdef INET6 |
| 1817 | if (isipv6) |
| 1818 | inp->in6p_hops = -1; /* use kernel default */ |
| 1819 | #endif |
| 1820 | tcp_newtcpcb(inp); |
| 1821 | /* Keep a reference for asynchronized pru_rcvd */ |
| 1822 | soreference(so); |
| 1823 | return (0); |
| 1824 | } |
| 1825 | |
| 1826 | /* |
| 1827 | * Initiate (or continue) disconnect. |
| 1828 | * If embryonic state, just send reset (once). |
| 1829 | * If in ``let data drain'' option and linger null, just drop. |
| 1830 | * Otherwise (hard), mark socket disconnecting and drop |
| 1831 | * current input data; switch states based on user close, and |
| 1832 | * send segment to peer (with FIN). |
| 1833 | */ |
| 1834 | static struct tcpcb * |
| 1835 | tcp_disconnect(struct tcpcb *tp) |
| 1836 | { |
| 1837 | struct socket *so = tp->t_inpcb->inp_socket; |
| 1838 | |
| 1839 | if (tp->t_state < TCPS_ESTABLISHED) { |
| 1840 | tp = tcp_close(tp); |
| 1841 | } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { |
| 1842 | tp = tcp_drop(tp, 0); |
| 1843 | } else { |
| 1844 | lwkt_gettoken(&so->so_rcv.ssb_token); |
| 1845 | soisdisconnecting(so); |
| 1846 | sbflush(&so->so_rcv.sb); |
| 1847 | tp = tcp_usrclosed(tp); |
| 1848 | if (tp) |
| 1849 | tcp_output(tp); |
| 1850 | lwkt_reltoken(&so->so_rcv.ssb_token); |
| 1851 | } |
| 1852 | return (tp); |
| 1853 | } |
| 1854 | |
| 1855 | /* |
| 1856 | * User issued close, and wish to trail through shutdown states: |
| 1857 | * if never received SYN, just forget it. If got a SYN from peer, |
| 1858 | * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. |
| 1859 | * If already got a FIN from peer, then almost done; go to LAST_ACK |
| 1860 | * state. In all other cases, have already sent FIN to peer (e.g. |
| 1861 | * after PRU_SHUTDOWN), and just have to play tedious game waiting |
| 1862 | * for peer to send FIN or not respond to keep-alives, etc. |
| 1863 | * We can let the user exit from the close as soon as the FIN is acked. |
| 1864 | */ |
| 1865 | static struct tcpcb * |
| 1866 | tcp_usrclosed(struct tcpcb *tp) |
| 1867 | { |
| 1868 | |
| 1869 | switch (tp->t_state) { |
| 1870 | |
| 1871 | case TCPS_CLOSED: |
| 1872 | case TCPS_LISTEN: |
| 1873 | TCP_STATE_CHANGE(tp, TCPS_CLOSED); |
| 1874 | tp = tcp_close(tp); |
| 1875 | break; |
| 1876 | |
| 1877 | case TCPS_SYN_SENT: |
| 1878 | case TCPS_SYN_RECEIVED: |
| 1879 | tp->t_flags |= TF_NEEDFIN; |
| 1880 | break; |
| 1881 | |
| 1882 | case TCPS_ESTABLISHED: |
| 1883 | TCP_STATE_CHANGE(tp, TCPS_FIN_WAIT_1); |
| 1884 | break; |
| 1885 | |
| 1886 | case TCPS_CLOSE_WAIT: |
| 1887 | TCP_STATE_CHANGE(tp, TCPS_LAST_ACK); |
| 1888 | break; |
| 1889 | } |
| 1890 | if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { |
| 1891 | soisdisconnected(tp->t_inpcb->inp_socket); |
| 1892 | /* To prevent the connection hanging in FIN_WAIT_2 forever. */ |
| 1893 | if (tp->t_state == TCPS_FIN_WAIT_2) { |
| 1894 | tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, |
| 1895 | tcp_timer_2msl); |
| 1896 | } |
| 1897 | } |
| 1898 | return (tp); |
| 1899 | } |