| 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. All advertising materials mentioning features or use of this software |
| 47 | * must display the following acknowledgement: |
| 48 | * This product includes software developed by the University of |
| 49 | * California, Berkeley and its contributors. |
| 50 | * 4. Neither the name of the University nor the names of its contributors |
| 51 | * may be used to endorse or promote products derived from this software |
| 52 | * without specific prior written permission. |
| 53 | * |
| 54 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 55 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 56 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 57 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 58 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 59 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 60 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 61 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 62 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 63 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 64 | * SUCH DAMAGE. |
| 65 | * |
| 66 | * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 |
| 67 | * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ |
| 68 | */ |
| 69 | |
| 70 | #include "opt_ipsec.h" |
| 71 | #include "opt_inet.h" |
| 72 | #include "opt_inet6.h" |
| 73 | #include "opt_tcpdebug.h" |
| 74 | |
| 75 | #include <sys/param.h> |
| 76 | #include <sys/systm.h> |
| 77 | #include <sys/kernel.h> |
| 78 | #include <sys/malloc.h> |
| 79 | #include <sys/sysctl.h> |
| 80 | #include <sys/globaldata.h> |
| 81 | #include <sys/thread.h> |
| 82 | |
| 83 | #include <sys/mbuf.h> |
| 84 | #ifdef INET6 |
| 85 | #include <sys/domain.h> |
| 86 | #endif /* INET6 */ |
| 87 | #include <sys/socket.h> |
| 88 | #include <sys/socketvar.h> |
| 89 | #include <sys/protosw.h> |
| 90 | |
| 91 | #include <sys/thread2.h> |
| 92 | #include <sys/msgport2.h> |
| 93 | #include <sys/socketvar2.h> |
| 94 | |
| 95 | #include <net/if.h> |
| 96 | #include <net/netisr.h> |
| 97 | #include <net/route.h> |
| 98 | |
| 99 | #include <net/netmsg2.h> |
| 100 | |
| 101 | #include <netinet/in.h> |
| 102 | #include <netinet/in_systm.h> |
| 103 | #ifdef INET6 |
| 104 | #include <netinet/ip6.h> |
| 105 | #endif |
| 106 | #include <netinet/in_pcb.h> |
| 107 | #ifdef INET6 |
| 108 | #include <netinet6/in6_pcb.h> |
| 109 | #endif |
| 110 | #include <netinet/in_var.h> |
| 111 | #include <netinet/ip_var.h> |
| 112 | #ifdef INET6 |
| 113 | #include <netinet6/ip6_var.h> |
| 114 | #include <netinet6/tcp6_var.h> |
| 115 | #endif |
| 116 | #include <netinet/tcp.h> |
| 117 | #include <netinet/tcp_fsm.h> |
| 118 | #include <netinet/tcp_seq.h> |
| 119 | #include <netinet/tcp_timer.h> |
| 120 | #include <netinet/tcp_timer2.h> |
| 121 | #include <netinet/tcp_var.h> |
| 122 | #include <netinet/tcpip.h> |
| 123 | #ifdef TCPDEBUG |
| 124 | #include <netinet/tcp_debug.h> |
| 125 | #endif |
| 126 | |
| 127 | #ifdef IPSEC |
| 128 | #include <netinet6/ipsec.h> |
| 129 | #endif /*IPSEC*/ |
| 130 | |
| 131 | /* |
| 132 | * TCP protocol interface to socket abstraction. |
| 133 | */ |
| 134 | extern char *tcpstates[]; /* XXX ??? */ |
| 135 | |
| 136 | static int tcp_attach (struct socket *, struct pru_attach_info *); |
| 137 | static void tcp_connect (netmsg_t msg); |
| 138 | #ifdef INET6 |
| 139 | static void tcp6_connect (netmsg_t msg); |
| 140 | static int tcp6_connect_oncpu(struct tcpcb *tp, int flags, |
| 141 | struct mbuf **mp, |
| 142 | struct sockaddr_in6 *sin6, |
| 143 | struct in6_addr *addr6); |
| 144 | #endif /* INET6 */ |
| 145 | static struct tcpcb * |
| 146 | tcp_disconnect (struct tcpcb *); |
| 147 | static struct tcpcb * |
| 148 | tcp_usrclosed (struct tcpcb *); |
| 149 | |
| 150 | #ifdef TCPDEBUG |
| 151 | #define TCPDEBUG0 int ostate = 0 |
| 152 | #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 |
| 153 | #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ |
| 154 | tcp_trace(TA_USER, ostate, tp, 0, 0, req) |
| 155 | #else |
| 156 | #define TCPDEBUG0 |
| 157 | #define TCPDEBUG1() |
| 158 | #define TCPDEBUG2(req) |
| 159 | #endif |
| 160 | |
| 161 | static int tcp_lport_extension = 1; |
| 162 | SYSCTL_INT(_net_inet_tcp, OID_AUTO, lportext, CTLFLAG_RW, |
| 163 | &tcp_lport_extension, 0, ""); |
| 164 | |
| 165 | /* |
| 166 | * For some ill optimized programs, which try to use TCP_NOPUSH |
| 167 | * to improve performance, will have small amount of data sits |
| 168 | * in the sending buffer. These small amount of data will _not_ |
| 169 | * be pushed into the network until more data are written into |
| 170 | * the socket or the socket write side is shutdown. |
| 171 | */ |
| 172 | static int tcp_disable_nopush = 1; |
| 173 | SYSCTL_INT(_net_inet_tcp, OID_AUTO, disable_nopush, CTLFLAG_RW, |
| 174 | &tcp_disable_nopush, 0, "TCP_NOPUSH socket option will have no effect"); |
| 175 | |
| 176 | /* |
| 177 | * TCP attaches to socket via pru_attach(), reserving space, |
| 178 | * and an internet control block. This is likely occuring on |
| 179 | * cpu0 and may have to move later when we bind/connect. |
| 180 | */ |
| 181 | static void |
| 182 | tcp_usr_attach(netmsg_t msg) |
| 183 | { |
| 184 | struct socket *so = msg->base.nm_so; |
| 185 | struct pru_attach_info *ai = msg->attach.nm_ai; |
| 186 | int error; |
| 187 | struct inpcb *inp; |
| 188 | struct tcpcb *tp = NULL; |
| 189 | TCPDEBUG0; |
| 190 | |
| 191 | soreference(so); |
| 192 | inp = so->so_pcb; |
| 193 | TCPDEBUG1(); |
| 194 | if (inp) { |
| 195 | error = EISCONN; |
| 196 | goto out; |
| 197 | } |
| 198 | |
| 199 | error = tcp_attach(so, ai); |
| 200 | if (error) |
| 201 | goto out; |
| 202 | |
| 203 | if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
| 204 | so->so_linger = TCP_LINGERTIME; |
| 205 | tp = sototcpcb(so); |
| 206 | out: |
| 207 | sofree(so); /* from ref above */ |
| 208 | TCPDEBUG2(PRU_ATTACH); |
| 209 | lwkt_replymsg(&msg->lmsg, error); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * pru_detach() detaches the TCP protocol from the socket. |
| 214 | * If the protocol state is non-embryonic, then can't |
| 215 | * do this directly: have to initiate a pru_disconnect(), |
| 216 | * which may finish later; embryonic TCB's can just |
| 217 | * be discarded here. |
| 218 | */ |
| 219 | static void |
| 220 | tcp_usr_detach(netmsg_t msg) |
| 221 | { |
| 222 | struct socket *so = msg->base.nm_so; |
| 223 | int error = 0; |
| 224 | struct inpcb *inp; |
| 225 | struct tcpcb *tp; |
| 226 | TCPDEBUG0; |
| 227 | |
| 228 | inp = so->so_pcb; |
| 229 | |
| 230 | /* |
| 231 | * If the inp is already detached it may have been due to an async |
| 232 | * close. Just return as if no error occured. |
| 233 | * |
| 234 | * It's possible for the tcpcb (tp) to disconnect from the inp due |
| 235 | * to tcp_drop()->tcp_close() being called. This may occur *after* |
| 236 | * the detach message has been queued so we may find a NULL tp here. |
| 237 | */ |
| 238 | if (inp) { |
| 239 | if ((tp = intotcpcb(inp)) != NULL) { |
| 240 | TCPDEBUG1(); |
| 241 | tp = tcp_disconnect(tp); |
| 242 | TCPDEBUG2(PRU_DETACH); |
| 243 | } |
| 244 | } |
| 245 | lwkt_replymsg(&msg->lmsg, error); |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * NOTE: ignore_error is non-zero for certain disconnection races |
| 250 | * which we want to silently allow, otherwise close() may return |
| 251 | * an unexpected error. |
| 252 | * |
| 253 | * NOTE: The variables (msg) and (tp) are assumed. |
| 254 | */ |
| 255 | #define COMMON_START(so, inp, ignore_error) \ |
| 256 | TCPDEBUG0; \ |
| 257 | \ |
| 258 | inp = so->so_pcb; \ |
| 259 | do { \ |
| 260 | if (inp == NULL) { \ |
| 261 | error = ignore_error ? 0 : EINVAL; \ |
| 262 | tp = NULL; \ |
| 263 | goto out; \ |
| 264 | } \ |
| 265 | tp = intotcpcb(inp); \ |
| 266 | TCPDEBUG1(); \ |
| 267 | } while(0) |
| 268 | |
| 269 | #define COMMON_END1(req, noreply) \ |
| 270 | out: do { \ |
| 271 | TCPDEBUG2(req); \ |
| 272 | if (!(noreply)) \ |
| 273 | lwkt_replymsg(&msg->lmsg, error); \ |
| 274 | return; \ |
| 275 | } while(0) |
| 276 | |
| 277 | #define COMMON_END(req) COMMON_END1((req), 0) |
| 278 | |
| 279 | /* |
| 280 | * Give the socket an address. |
| 281 | */ |
| 282 | static void |
| 283 | tcp_usr_bind(netmsg_t msg) |
| 284 | { |
| 285 | struct socket *so = msg->bind.base.nm_so; |
| 286 | struct sockaddr *nam = msg->bind.nm_nam; |
| 287 | struct thread *td = msg->bind.nm_td; |
| 288 | int error = 0; |
| 289 | struct inpcb *inp; |
| 290 | struct tcpcb *tp; |
| 291 | struct sockaddr_in *sinp; |
| 292 | |
| 293 | COMMON_START(so, inp, 0); |
| 294 | |
| 295 | /* |
| 296 | * Must check for multicast addresses and disallow binding |
| 297 | * to them. |
| 298 | */ |
| 299 | sinp = (struct sockaddr_in *)nam; |
| 300 | if (sinp->sin_family == AF_INET && |
| 301 | IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 302 | error = EAFNOSUPPORT; |
| 303 | goto out; |
| 304 | } |
| 305 | error = in_pcbbind(inp, nam, td); |
| 306 | if (error) |
| 307 | goto out; |
| 308 | COMMON_END(PRU_BIND); |
| 309 | |
| 310 | } |
| 311 | |
| 312 | #ifdef INET6 |
| 313 | |
| 314 | static void |
| 315 | tcp6_usr_bind(netmsg_t msg) |
| 316 | { |
| 317 | struct socket *so = msg->bind.base.nm_so; |
| 318 | struct sockaddr *nam = msg->bind.nm_nam; |
| 319 | struct thread *td = msg->bind.nm_td; |
| 320 | int error = 0; |
| 321 | struct inpcb *inp; |
| 322 | struct tcpcb *tp; |
| 323 | struct sockaddr_in6 *sin6p; |
| 324 | |
| 325 | COMMON_START(so, inp, 0); |
| 326 | |
| 327 | /* |
| 328 | * Must check for multicast addresses and disallow binding |
| 329 | * to them. |
| 330 | */ |
| 331 | sin6p = (struct sockaddr_in6 *)nam; |
| 332 | if (sin6p->sin6_family == AF_INET6 && |
| 333 | IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 334 | error = EAFNOSUPPORT; |
| 335 | goto out; |
| 336 | } |
| 337 | inp->inp_vflag &= ~INP_IPV4; |
| 338 | inp->inp_vflag |= INP_IPV6; |
| 339 | if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { |
| 340 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) |
| 341 | inp->inp_vflag |= INP_IPV4; |
| 342 | else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { |
| 343 | struct sockaddr_in sin; |
| 344 | |
| 345 | in6_sin6_2_sin(&sin, sin6p); |
| 346 | inp->inp_vflag |= INP_IPV4; |
| 347 | inp->inp_vflag &= ~INP_IPV6; |
| 348 | error = in_pcbbind(inp, (struct sockaddr *)&sin, td); |
| 349 | goto out; |
| 350 | } |
| 351 | } |
| 352 | error = in6_pcbbind(inp, nam, td); |
| 353 | if (error) |
| 354 | goto out; |
| 355 | COMMON_END(PRU_BIND); |
| 356 | } |
| 357 | #endif /* INET6 */ |
| 358 | |
| 359 | #ifdef SMP |
| 360 | |
| 361 | struct netmsg_inswildcard { |
| 362 | struct netmsg_base base; |
| 363 | struct inpcb *nm_inp; |
| 364 | }; |
| 365 | |
| 366 | static void |
| 367 | in_pcbinswildcardhash_handler(netmsg_t msg) |
| 368 | { |
| 369 | struct netmsg_inswildcard *nm = (struct netmsg_inswildcard *)msg; |
| 370 | int cpu = mycpuid, nextcpu; |
| 371 | |
| 372 | in_pcbinswildcardhash_oncpu(nm->nm_inp, &tcbinfo[cpu]); |
| 373 | |
| 374 | nextcpu = cpu + 1; |
| 375 | if (nextcpu < ncpus2) |
| 376 | lwkt_forwardmsg(cpu_portfn(nextcpu), &nm->base.lmsg); |
| 377 | else |
| 378 | lwkt_replymsg(&nm->base.lmsg, 0); |
| 379 | } |
| 380 | |
| 381 | #endif |
| 382 | |
| 383 | /* |
| 384 | * Prepare to accept connections. |
| 385 | */ |
| 386 | static void |
| 387 | tcp_usr_listen(netmsg_t msg) |
| 388 | { |
| 389 | struct socket *so = msg->listen.base.nm_so; |
| 390 | struct thread *td = msg->listen.nm_td; |
| 391 | int error = 0; |
| 392 | struct inpcb *inp; |
| 393 | struct tcpcb *tp; |
| 394 | #ifdef SMP |
| 395 | struct netmsg_inswildcard nm; |
| 396 | #endif |
| 397 | |
| 398 | COMMON_START(so, inp, 0); |
| 399 | |
| 400 | if (tp->t_flags & TF_LISTEN) |
| 401 | goto out; |
| 402 | |
| 403 | if (inp->inp_lport == 0) { |
| 404 | error = in_pcbbind(inp, NULL, td); |
| 405 | if (error) |
| 406 | goto out; |
| 407 | } |
| 408 | |
| 409 | tp->t_state = TCPS_LISTEN; |
| 410 | tp->t_flags |= TF_LISTEN; |
| 411 | tp->tt_msg = NULL; /* Catch any invalid timer usage */ |
| 412 | |
| 413 | #ifdef SMP |
| 414 | if (ncpus > 1) { |
| 415 | /* |
| 416 | * We have to set the flag because we can't have other cpus |
| 417 | * messing with our inp's flags. |
| 418 | */ |
| 419 | KASSERT(!(inp->inp_flags & INP_CONNECTED), |
| 420 | ("already on connhash")); |
| 421 | KASSERT(!(inp->inp_flags & INP_WILDCARD), |
| 422 | ("already on wildcardhash")); |
| 423 | KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), |
| 424 | ("already on MP wildcardhash")); |
| 425 | inp->inp_flags |= INP_WILDCARD_MP; |
| 426 | |
| 427 | KKASSERT(so->so_port == cpu_portfn(0)); |
| 428 | KKASSERT(&curthread->td_msgport == cpu_portfn(0)); |
| 429 | KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); |
| 430 | |
| 431 | netmsg_init(&nm.base, NULL, &curthread->td_msgport, |
| 432 | MSGF_PRIORITY, in_pcbinswildcardhash_handler); |
| 433 | nm.nm_inp = inp; |
| 434 | lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0); |
| 435 | } |
| 436 | #endif |
| 437 | in_pcbinswildcardhash(inp); |
| 438 | COMMON_END(PRU_LISTEN); |
| 439 | } |
| 440 | |
| 441 | #ifdef INET6 |
| 442 | |
| 443 | static void |
| 444 | tcp6_usr_listen(netmsg_t msg) |
| 445 | { |
| 446 | struct socket *so = msg->listen.base.nm_so; |
| 447 | struct thread *td = msg->listen.nm_td; |
| 448 | int error = 0; |
| 449 | struct inpcb *inp; |
| 450 | struct tcpcb *tp; |
| 451 | #ifdef SMP |
| 452 | struct netmsg_inswildcard nm; |
| 453 | #endif |
| 454 | |
| 455 | COMMON_START(so, inp, 0); |
| 456 | |
| 457 | if (tp->t_flags & TF_LISTEN) |
| 458 | goto out; |
| 459 | |
| 460 | if (inp->inp_lport == 0) { |
| 461 | if (!(inp->inp_flags & IN6P_IPV6_V6ONLY)) |
| 462 | inp->inp_vflag |= INP_IPV4; |
| 463 | else |
| 464 | inp->inp_vflag &= ~INP_IPV4; |
| 465 | error = in6_pcbbind(inp, NULL, td); |
| 466 | if (error) |
| 467 | goto out; |
| 468 | } |
| 469 | |
| 470 | tp->t_state = TCPS_LISTEN; |
| 471 | tp->t_flags |= TF_LISTEN; |
| 472 | tp->tt_msg = NULL; /* Catch any invalid timer usage */ |
| 473 | |
| 474 | #ifdef SMP |
| 475 | if (ncpus > 1) { |
| 476 | /* |
| 477 | * We have to set the flag because we can't have other cpus |
| 478 | * messing with our inp's flags. |
| 479 | */ |
| 480 | KASSERT(!(inp->inp_flags & INP_CONNECTED), |
| 481 | ("already on connhash")); |
| 482 | KASSERT(!(inp->inp_flags & INP_WILDCARD), |
| 483 | ("already on wildcardhash")); |
| 484 | KASSERT(!(inp->inp_flags & INP_WILDCARD_MP), |
| 485 | ("already on MP wildcardhash")); |
| 486 | inp->inp_flags |= INP_WILDCARD_MP; |
| 487 | |
| 488 | KKASSERT(so->so_port == cpu_portfn(0)); |
| 489 | KKASSERT(&curthread->td_msgport == cpu_portfn(0)); |
| 490 | KKASSERT(inp->inp_pcbinfo == &tcbinfo[0]); |
| 491 | |
| 492 | netmsg_init(&nm.base, NULL, &curthread->td_msgport, |
| 493 | MSGF_PRIORITY, in_pcbinswildcardhash_handler); |
| 494 | nm.nm_inp = inp; |
| 495 | lwkt_domsg(cpu_portfn(1), &nm.base.lmsg, 0); |
| 496 | } |
| 497 | #endif |
| 498 | in_pcbinswildcardhash(inp); |
| 499 | COMMON_END(PRU_LISTEN); |
| 500 | } |
| 501 | #endif /* INET6 */ |
| 502 | |
| 503 | /* |
| 504 | * Initiate connection to peer. |
| 505 | * Create a template for use in transmissions on this connection. |
| 506 | * Enter SYN_SENT state, and mark socket as connecting. |
| 507 | * Start keep-alive timer, and seed output sequence space. |
| 508 | * Send initial segment on connection. |
| 509 | */ |
| 510 | static void |
| 511 | tcp_usr_connect(netmsg_t msg) |
| 512 | { |
| 513 | struct socket *so = msg->connect.base.nm_so; |
| 514 | struct sockaddr *nam = msg->connect.nm_nam; |
| 515 | struct thread *td = msg->connect.nm_td; |
| 516 | int error = 0; |
| 517 | struct inpcb *inp; |
| 518 | struct tcpcb *tp; |
| 519 | struct sockaddr_in *sinp; |
| 520 | |
| 521 | COMMON_START(so, inp, 0); |
| 522 | |
| 523 | /* |
| 524 | * Must disallow TCP ``connections'' to multicast addresses. |
| 525 | */ |
| 526 | sinp = (struct sockaddr_in *)nam; |
| 527 | if (sinp->sin_family == AF_INET |
| 528 | && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 529 | error = EAFNOSUPPORT; |
| 530 | goto out; |
| 531 | } |
| 532 | |
| 533 | if (!prison_remote_ip(td, (struct sockaddr*)sinp)) { |
| 534 | error = EAFNOSUPPORT; /* IPv6 only jail */ |
| 535 | goto out; |
| 536 | } |
| 537 | |
| 538 | tcp_connect(msg); |
| 539 | /* msg is invalid now */ |
| 540 | return; |
| 541 | out: |
| 542 | if (msg->connect.nm_m) { |
| 543 | m_freem(msg->connect.nm_m); |
| 544 | msg->connect.nm_m = NULL; |
| 545 | } |
| 546 | lwkt_replymsg(&msg->lmsg, error); |
| 547 | } |
| 548 | |
| 549 | #ifdef INET6 |
| 550 | |
| 551 | static void |
| 552 | tcp6_usr_connect(netmsg_t msg) |
| 553 | { |
| 554 | struct socket *so = msg->connect.base.nm_so; |
| 555 | struct sockaddr *nam = msg->connect.nm_nam; |
| 556 | struct thread *td = msg->connect.nm_td; |
| 557 | int error = 0; |
| 558 | struct inpcb *inp; |
| 559 | struct tcpcb *tp; |
| 560 | struct sockaddr_in6 *sin6p; |
| 561 | |
| 562 | COMMON_START(so, inp, 0); |
| 563 | |
| 564 | /* |
| 565 | * Must disallow TCP ``connections'' to multicast addresses. |
| 566 | */ |
| 567 | sin6p = (struct sockaddr_in6 *)nam; |
| 568 | if (sin6p->sin6_family == AF_INET6 |
| 569 | && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 570 | error = EAFNOSUPPORT; |
| 571 | goto out; |
| 572 | } |
| 573 | |
| 574 | if (!prison_remote_ip(td, nam)) { |
| 575 | error = EAFNOSUPPORT; /* IPv4 only jail */ |
| 576 | goto out; |
| 577 | } |
| 578 | |
| 579 | if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { |
| 580 | struct sockaddr_in *sinp; |
| 581 | |
| 582 | if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { |
| 583 | error = EINVAL; |
| 584 | goto out; |
| 585 | } |
| 586 | sinp = kmalloc(sizeof(*sinp), M_LWKTMSG, M_INTWAIT); |
| 587 | in6_sin6_2_sin(sinp, sin6p); |
| 588 | inp->inp_vflag |= INP_IPV4; |
| 589 | inp->inp_vflag &= ~INP_IPV6; |
| 590 | msg->connect.nm_nam = (struct sockaddr *)sinp; |
| 591 | msg->connect.nm_reconnect |= NMSG_RECONNECT_NAMALLOC; |
| 592 | tcp_connect(msg); |
| 593 | /* msg is invalid now */ |
| 594 | return; |
| 595 | } |
| 596 | inp->inp_vflag &= ~INP_IPV4; |
| 597 | inp->inp_vflag |= INP_IPV6; |
| 598 | inp->inp_inc.inc_isipv6 = 1; |
| 599 | |
| 600 | msg->connect.nm_reconnect |= NMSG_RECONNECT_FALLBACK; |
| 601 | tcp6_connect(msg); |
| 602 | /* msg is invalid now */ |
| 603 | return; |
| 604 | out: |
| 605 | if (msg->connect.nm_m) { |
| 606 | m_freem(msg->connect.nm_m); |
| 607 | msg->connect.nm_m = NULL; |
| 608 | } |
| 609 | lwkt_replymsg(&msg->lmsg, error); |
| 610 | } |
| 611 | |
| 612 | #endif /* INET6 */ |
| 613 | |
| 614 | /* |
| 615 | * Initiate disconnect from peer. |
| 616 | * If connection never passed embryonic stage, just drop; |
| 617 | * else if don't need to let data drain, then can just drop anyways, |
| 618 | * else have to begin TCP shutdown process: mark socket disconnecting, |
| 619 | * drain unread data, state switch to reflect user close, and |
| 620 | * send segment (e.g. FIN) to peer. Socket will be really disconnected |
| 621 | * when peer sends FIN and acks ours. |
| 622 | * |
| 623 | * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. |
| 624 | */ |
| 625 | static void |
| 626 | tcp_usr_disconnect(netmsg_t msg) |
| 627 | { |
| 628 | struct socket *so = msg->disconnect.base.nm_so; |
| 629 | int error = 0; |
| 630 | struct inpcb *inp; |
| 631 | struct tcpcb *tp; |
| 632 | |
| 633 | COMMON_START(so, inp, 1); |
| 634 | tp = tcp_disconnect(tp); |
| 635 | COMMON_END(PRU_DISCONNECT); |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Accept a connection. Essentially all the work is |
| 640 | * done at higher levels; just return the address |
| 641 | * of the peer, storing through addr. |
| 642 | */ |
| 643 | static void |
| 644 | tcp_usr_accept(netmsg_t msg) |
| 645 | { |
| 646 | struct socket *so = msg->accept.base.nm_so; |
| 647 | struct sockaddr **nam = msg->accept.nm_nam; |
| 648 | int error = 0; |
| 649 | struct inpcb *inp; |
| 650 | struct tcpcb *tp = NULL; |
| 651 | TCPDEBUG0; |
| 652 | |
| 653 | inp = so->so_pcb; |
| 654 | if (so->so_state & SS_ISDISCONNECTED) { |
| 655 | error = ECONNABORTED; |
| 656 | goto out; |
| 657 | } |
| 658 | if (inp == 0) { |
| 659 | error = EINVAL; |
| 660 | goto out; |
| 661 | } |
| 662 | |
| 663 | tp = intotcpcb(inp); |
| 664 | TCPDEBUG1(); |
| 665 | in_setpeeraddr(so, nam); |
| 666 | COMMON_END(PRU_ACCEPT); |
| 667 | } |
| 668 | |
| 669 | #ifdef INET6 |
| 670 | static void |
| 671 | tcp6_usr_accept(netmsg_t msg) |
| 672 | { |
| 673 | struct socket *so = msg->accept.base.nm_so; |
| 674 | struct sockaddr **nam = msg->accept.nm_nam; |
| 675 | int error = 0; |
| 676 | struct inpcb *inp; |
| 677 | struct tcpcb *tp = NULL; |
| 678 | TCPDEBUG0; |
| 679 | |
| 680 | inp = so->so_pcb; |
| 681 | |
| 682 | if (so->so_state & SS_ISDISCONNECTED) { |
| 683 | error = ECONNABORTED; |
| 684 | goto out; |
| 685 | } |
| 686 | if (inp == 0) { |
| 687 | error = EINVAL; |
| 688 | goto out; |
| 689 | } |
| 690 | tp = intotcpcb(inp); |
| 691 | TCPDEBUG1(); |
| 692 | in6_mapped_peeraddr(so, nam); |
| 693 | COMMON_END(PRU_ACCEPT); |
| 694 | } |
| 695 | #endif /* INET6 */ |
| 696 | /* |
| 697 | * Mark the connection as being incapable of further output. |
| 698 | */ |
| 699 | static void |
| 700 | tcp_usr_shutdown(netmsg_t msg) |
| 701 | { |
| 702 | struct socket *so = msg->shutdown.base.nm_so; |
| 703 | int error = 0; |
| 704 | struct inpcb *inp; |
| 705 | struct tcpcb *tp; |
| 706 | |
| 707 | COMMON_START(so, inp, 0); |
| 708 | socantsendmore(so); |
| 709 | tp = tcp_usrclosed(tp); |
| 710 | if (tp) |
| 711 | error = tcp_output(tp); |
| 712 | COMMON_END(PRU_SHUTDOWN); |
| 713 | } |
| 714 | |
| 715 | /* |
| 716 | * After a receive, possibly send window update to peer. |
| 717 | */ |
| 718 | static void |
| 719 | tcp_usr_rcvd(netmsg_t msg) |
| 720 | { |
| 721 | struct socket *so = msg->rcvd.base.nm_so; |
| 722 | int error = 0; |
| 723 | struct inpcb *inp; |
| 724 | struct tcpcb *tp; |
| 725 | |
| 726 | COMMON_START(so, inp, 0); |
| 727 | tcp_output(tp); |
| 728 | COMMON_END(PRU_RCVD); |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Do a send by putting data in output queue and updating urgent |
| 733 | * marker if URG set. Possibly send more data. Unlike the other |
| 734 | * pru_*() routines, the mbuf chains are our responsibility. We |
| 735 | * must either enqueue them or free them. The other pru_* routines |
| 736 | * generally are caller-frees. |
| 737 | */ |
| 738 | static void |
| 739 | tcp_usr_send(netmsg_t msg) |
| 740 | { |
| 741 | struct socket *so = msg->send.base.nm_so; |
| 742 | int flags = msg->send.nm_flags; |
| 743 | struct mbuf *m = msg->send.nm_m; |
| 744 | int error = 0; |
| 745 | struct inpcb *inp; |
| 746 | struct tcpcb *tp; |
| 747 | TCPDEBUG0; |
| 748 | |
| 749 | KKASSERT(msg->send.nm_control == NULL); |
| 750 | KKASSERT(msg->send.nm_addr == NULL); |
| 751 | KKASSERT((flags & PRUS_FREEADDR) == 0); |
| 752 | |
| 753 | inp = so->so_pcb; |
| 754 | |
| 755 | if (inp == NULL) { |
| 756 | /* |
| 757 | * OOPS! we lost a race, the TCP session got reset after |
| 758 | * we checked SS_CANTSENDMORE, eg: while doing uiomove or a |
| 759 | * network interrupt in the non-critical section of sosend(). |
| 760 | */ |
| 761 | m_freem(m); |
| 762 | error = ECONNRESET; /* XXX EPIPE? */ |
| 763 | tp = NULL; |
| 764 | TCPDEBUG1(); |
| 765 | goto out; |
| 766 | } |
| 767 | tp = intotcpcb(inp); |
| 768 | TCPDEBUG1(); |
| 769 | |
| 770 | #ifdef foo |
| 771 | /* |
| 772 | * This is no longer necessary, since: |
| 773 | * - sosendtcp() has already checked it for us |
| 774 | * - It does not work with asynchronized send |
| 775 | */ |
| 776 | |
| 777 | /* |
| 778 | * Don't let too much OOB data build up |
| 779 | */ |
| 780 | if (flags & PRUS_OOB) { |
| 781 | if (ssb_space(&so->so_snd) < -512) { |
| 782 | m_freem(m); |
| 783 | error = ENOBUFS; |
| 784 | goto out; |
| 785 | } |
| 786 | } |
| 787 | #endif |
| 788 | |
| 789 | /* |
| 790 | * Pump the data into the socket. |
| 791 | */ |
| 792 | if (m) |
| 793 | ssb_appendstream(&so->so_snd, m); |
| 794 | if (flags & PRUS_OOB) { |
| 795 | /* |
| 796 | * According to RFC961 (Assigned Protocols), |
| 797 | * the urgent pointer points to the last octet |
| 798 | * of urgent data. We continue, however, |
| 799 | * to consider it to indicate the first octet |
| 800 | * of data past the urgent section. |
| 801 | * Otherwise, snd_up should be one lower. |
| 802 | */ |
| 803 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 804 | tp->t_flags |= TF_FORCE; |
| 805 | error = tcp_output(tp); |
| 806 | tp->t_flags &= ~TF_FORCE; |
| 807 | } else { |
| 808 | if (flags & PRUS_EOF) { |
| 809 | /* |
| 810 | * Close the send side of the connection after |
| 811 | * the data is sent. |
| 812 | */ |
| 813 | socantsendmore(so); |
| 814 | tp = tcp_usrclosed(tp); |
| 815 | } |
| 816 | if (tp != NULL) { |
| 817 | if (flags & PRUS_MORETOCOME) |
| 818 | tp->t_flags |= TF_MORETOCOME; |
| 819 | error = tcp_output(tp); |
| 820 | if (flags & PRUS_MORETOCOME) |
| 821 | tp->t_flags &= ~TF_MORETOCOME; |
| 822 | } |
| 823 | } |
| 824 | COMMON_END1((flags & PRUS_OOB) ? PRU_SENDOOB : |
| 825 | ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), |
| 826 | (flags & PRUS_NOREPLY)); |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() |
| 831 | * will sofree() it when we return. |
| 832 | */ |
| 833 | static void |
| 834 | tcp_usr_abort(netmsg_t msg) |
| 835 | { |
| 836 | struct socket *so = msg->abort.base.nm_so; |
| 837 | int error = 0; |
| 838 | struct inpcb *inp; |
| 839 | struct tcpcb *tp; |
| 840 | |
| 841 | COMMON_START(so, inp, 1); |
| 842 | tp = tcp_drop(tp, ECONNABORTED); |
| 843 | COMMON_END(PRU_ABORT); |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Receive out-of-band data. |
| 848 | */ |
| 849 | static void |
| 850 | tcp_usr_rcvoob(netmsg_t msg) |
| 851 | { |
| 852 | struct socket *so = msg->rcvoob.base.nm_so; |
| 853 | struct mbuf *m = msg->rcvoob.nm_m; |
| 854 | int flags = msg->rcvoob.nm_flags; |
| 855 | int error = 0; |
| 856 | struct inpcb *inp; |
| 857 | struct tcpcb *tp; |
| 858 | |
| 859 | COMMON_START(so, inp, 0); |
| 860 | if ((so->so_oobmark == 0 && |
| 861 | (so->so_state & SS_RCVATMARK) == 0) || |
| 862 | so->so_options & SO_OOBINLINE || |
| 863 | tp->t_oobflags & TCPOOB_HADDATA) { |
| 864 | error = EINVAL; |
| 865 | goto out; |
| 866 | } |
| 867 | if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { |
| 868 | error = EWOULDBLOCK; |
| 869 | goto out; |
| 870 | } |
| 871 | m->m_len = 1; |
| 872 | *mtod(m, caddr_t) = tp->t_iobc; |
| 873 | if ((flags & MSG_PEEK) == 0) |
| 874 | tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); |
| 875 | COMMON_END(PRU_RCVOOB); |
| 876 | } |
| 877 | |
| 878 | static void |
| 879 | tcp_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) |
| 880 | { |
| 881 | in_savefaddr(so, faddr); |
| 882 | } |
| 883 | |
| 884 | #ifdef INET6 |
| 885 | static void |
| 886 | tcp6_usr_savefaddr(struct socket *so, const struct sockaddr *faddr) |
| 887 | { |
| 888 | in6_mapped_savefaddr(so, faddr); |
| 889 | } |
| 890 | #endif |
| 891 | |
| 892 | /* xxx - should be const */ |
| 893 | struct pr_usrreqs tcp_usrreqs = { |
| 894 | .pru_abort = tcp_usr_abort, |
| 895 | .pru_accept = tcp_usr_accept, |
| 896 | .pru_attach = tcp_usr_attach, |
| 897 | .pru_bind = tcp_usr_bind, |
| 898 | .pru_connect = tcp_usr_connect, |
| 899 | .pru_connect2 = pr_generic_notsupp, |
| 900 | .pru_control = in_control_dispatch, |
| 901 | .pru_detach = tcp_usr_detach, |
| 902 | .pru_disconnect = tcp_usr_disconnect, |
| 903 | .pru_listen = tcp_usr_listen, |
| 904 | .pru_peeraddr = in_setpeeraddr_dispatch, |
| 905 | .pru_rcvd = tcp_usr_rcvd, |
| 906 | .pru_rcvoob = tcp_usr_rcvoob, |
| 907 | .pru_send = tcp_usr_send, |
| 908 | .pru_sense = pru_sense_null, |
| 909 | .pru_shutdown = tcp_usr_shutdown, |
| 910 | .pru_sockaddr = in_setsockaddr_dispatch, |
| 911 | .pru_sosend = sosendtcp, |
| 912 | .pru_soreceive = sorecvtcp, |
| 913 | .pru_savefaddr = tcp_usr_savefaddr |
| 914 | }; |
| 915 | |
| 916 | #ifdef INET6 |
| 917 | struct pr_usrreqs tcp6_usrreqs = { |
| 918 | .pru_abort = tcp_usr_abort, |
| 919 | .pru_accept = tcp6_usr_accept, |
| 920 | .pru_attach = tcp_usr_attach, |
| 921 | .pru_bind = tcp6_usr_bind, |
| 922 | .pru_connect = tcp6_usr_connect, |
| 923 | .pru_connect2 = pr_generic_notsupp, |
| 924 | .pru_control = in6_control_dispatch, |
| 925 | .pru_detach = tcp_usr_detach, |
| 926 | .pru_disconnect = tcp_usr_disconnect, |
| 927 | .pru_listen = tcp6_usr_listen, |
| 928 | .pru_peeraddr = in6_mapped_peeraddr_dispatch, |
| 929 | .pru_rcvd = tcp_usr_rcvd, |
| 930 | .pru_rcvoob = tcp_usr_rcvoob, |
| 931 | .pru_send = tcp_usr_send, |
| 932 | .pru_sense = pru_sense_null, |
| 933 | .pru_shutdown = tcp_usr_shutdown, |
| 934 | .pru_sockaddr = in6_mapped_sockaddr_dispatch, |
| 935 | .pru_sosend = sosendtcp, |
| 936 | .pru_soreceive = sorecvtcp, |
| 937 | .pru_savefaddr = tcp6_usr_savefaddr |
| 938 | }; |
| 939 | #endif /* INET6 */ |
| 940 | |
| 941 | static int |
| 942 | tcp_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf *m, |
| 943 | struct sockaddr_in *sin, struct sockaddr_in *if_sin) |
| 944 | { |
| 945 | struct inpcb *inp = tp->t_inpcb, *oinp; |
| 946 | struct socket *so = inp->inp_socket; |
| 947 | struct route *ro = &inp->inp_route; |
| 948 | |
| 949 | oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], |
| 950 | sin->sin_addr, sin->sin_port, |
| 951 | (inp->inp_laddr.s_addr != INADDR_ANY ? |
| 952 | inp->inp_laddr : if_sin->sin_addr), |
| 953 | inp->inp_lport, 0, NULL); |
| 954 | if (oinp != NULL) { |
| 955 | m_freem(m); |
| 956 | return (EADDRINUSE); |
| 957 | } |
| 958 | if (inp->inp_laddr.s_addr == INADDR_ANY) |
| 959 | inp->inp_laddr = if_sin->sin_addr; |
| 960 | inp->inp_faddr = sin->sin_addr; |
| 961 | inp->inp_fport = sin->sin_port; |
| 962 | inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; |
| 963 | in_pcbinsconnhash(inp); |
| 964 | |
| 965 | /* |
| 966 | * We are now on the inpcb's owner CPU, if the cached route was |
| 967 | * freed because the rtentry's owner CPU is not the current CPU |
| 968 | * (e.g. in tcp_connect()), then we try to reallocate it here with |
| 969 | * the hope that a rtentry may be cloned from a RTF_PRCLONING |
| 970 | * rtentry. |
| 971 | */ |
| 972 | if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/ |
| 973 | ro->ro_rt == NULL) { |
| 974 | bzero(&ro->ro_dst, sizeof(struct sockaddr_in)); |
| 975 | ro->ro_dst.sa_family = AF_INET; |
| 976 | ro->ro_dst.sa_len = sizeof(struct sockaddr_in); |
| 977 | ((struct sockaddr_in *)&ro->ro_dst)->sin_addr = |
| 978 | sin->sin_addr; |
| 979 | rtalloc(ro); |
| 980 | } |
| 981 | |
| 982 | /* |
| 983 | * Now that no more errors can occur, change the protocol processing |
| 984 | * port to the current thread (which is the correct thread). |
| 985 | * |
| 986 | * Create TCP timer message now; we are on the tcpcb's owner |
| 987 | * CPU/thread. |
| 988 | */ |
| 989 | tcp_create_timermsg(tp, &curthread->td_msgport); |
| 990 | |
| 991 | /* |
| 992 | * Compute window scaling to request. Use a larger scaling then |
| 993 | * needed for the initial receive buffer in case the receive buffer |
| 994 | * gets expanded. |
| 995 | */ |
| 996 | if (tp->request_r_scale < TCP_MIN_WINSHIFT) |
| 997 | tp->request_r_scale = TCP_MIN_WINSHIFT; |
| 998 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 999 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat |
| 1000 | ) { |
| 1001 | tp->request_r_scale++; |
| 1002 | } |
| 1003 | |
| 1004 | soisconnecting(so); |
| 1005 | tcpstat.tcps_connattempt++; |
| 1006 | tp->t_state = TCPS_SYN_SENT; |
| 1007 | tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); |
| 1008 | tp->iss = tcp_new_isn(tp); |
| 1009 | tcp_sendseqinit(tp); |
| 1010 | if (m) { |
| 1011 | ssb_appendstream(&so->so_snd, m); |
| 1012 | m = NULL; |
| 1013 | if (flags & PRUS_OOB) |
| 1014 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | * Close the send side of the connection after |
| 1019 | * the data is sent if flagged. |
| 1020 | */ |
| 1021 | if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { |
| 1022 | socantsendmore(so); |
| 1023 | tp = tcp_usrclosed(tp); |
| 1024 | } |
| 1025 | return (tcp_output(tp)); |
| 1026 | } |
| 1027 | |
| 1028 | /* |
| 1029 | * Common subroutine to open a TCP connection to remote host specified |
| 1030 | * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local |
| 1031 | * port number if needed. Call in_pcbladdr to do the routing and to choose |
| 1032 | * a local host address (interface). |
| 1033 | * Initialize connection parameters and enter SYN-SENT state. |
| 1034 | */ |
| 1035 | static void |
| 1036 | tcp_connect(netmsg_t msg) |
| 1037 | { |
| 1038 | struct socket *so = msg->connect.base.nm_so; |
| 1039 | struct sockaddr *nam = msg->connect.nm_nam; |
| 1040 | struct thread *td = msg->connect.nm_td; |
| 1041 | struct sockaddr_in *sin = (struct sockaddr_in *)nam; |
| 1042 | struct sockaddr_in *if_sin; |
| 1043 | struct inpcb *inp; |
| 1044 | struct tcpcb *tp; |
| 1045 | int error, calc_laddr = 1; |
| 1046 | #ifdef SMP |
| 1047 | lwkt_port_t port; |
| 1048 | #endif |
| 1049 | |
| 1050 | COMMON_START(so, inp, 0); |
| 1051 | |
| 1052 | /* |
| 1053 | * Reconnect our pcb if we have to |
| 1054 | */ |
| 1055 | if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { |
| 1056 | msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; |
| 1057 | in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Bind if we have to |
| 1062 | */ |
| 1063 | if (inp->inp_lport == 0) { |
| 1064 | if (tcp_lport_extension) { |
| 1065 | KKASSERT(inp->inp_laddr.s_addr == INADDR_ANY); |
| 1066 | |
| 1067 | error = in_pcbladdr(inp, nam, &if_sin, td); |
| 1068 | if (error) |
| 1069 | goto out; |
| 1070 | inp->inp_laddr.s_addr = if_sin->sin_addr.s_addr; |
| 1071 | |
| 1072 | error = in_pcbconn_bind(inp, nam, td); |
| 1073 | if (error) |
| 1074 | goto out; |
| 1075 | |
| 1076 | calc_laddr = 0; |
| 1077 | } else { |
| 1078 | error = in_pcbbind(inp, NULL, td); |
| 1079 | if (error) |
| 1080 | goto out; |
| 1081 | } |
| 1082 | } |
| 1083 | |
| 1084 | if (calc_laddr) { |
| 1085 | /* |
| 1086 | * Calculate the correct protocol processing thread. The |
| 1087 | * connect operation must run there. Set the forwarding |
| 1088 | * port before we forward the message or it will get bounced |
| 1089 | * right back to us. |
| 1090 | */ |
| 1091 | error = in_pcbladdr(inp, nam, &if_sin, td); |
| 1092 | if (error) |
| 1093 | goto out; |
| 1094 | } |
| 1095 | KKASSERT(inp->inp_socket == so); |
| 1096 | |
| 1097 | #ifdef SMP |
| 1098 | port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, |
| 1099 | (inp->inp_laddr.s_addr ? |
| 1100 | inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr), |
| 1101 | inp->inp_lport); |
| 1102 | |
| 1103 | if (port != &curthread->td_msgport) { |
| 1104 | struct route *ro = &inp->inp_route; |
| 1105 | |
| 1106 | /* |
| 1107 | * in_pcbladdr() may have allocated a route entry for us |
| 1108 | * on the current CPU, but we need a route entry on the |
| 1109 | * inpcb's owner CPU, so free it here. |
| 1110 | */ |
| 1111 | if (ro->ro_rt != NULL) |
| 1112 | RTFREE(ro->ro_rt); |
| 1113 | bzero(ro, sizeof(*ro)); |
| 1114 | |
| 1115 | /* |
| 1116 | * We are moving the protocol processing port the socket |
| 1117 | * is on, we have to unlink here and re-link on the |
| 1118 | * target cpu. |
| 1119 | */ |
| 1120 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1121 | sosetport(so, port); |
| 1122 | msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; |
| 1123 | msg->connect.base.nm_dispatch = tcp_connect; |
| 1124 | |
| 1125 | lwkt_forwardmsg(port, &msg->connect.base.lmsg); |
| 1126 | /* msg invalid now */ |
| 1127 | return; |
| 1128 | } |
| 1129 | #else |
| 1130 | KKASSERT(so->so_port == &curthread->td_msgport); |
| 1131 | #endif |
| 1132 | error = tcp_connect_oncpu(tp, msg->connect.nm_flags, |
| 1133 | msg->connect.nm_m, sin, if_sin); |
| 1134 | msg->connect.nm_m = NULL; |
| 1135 | out: |
| 1136 | if (msg->connect.nm_m) { |
| 1137 | m_freem(msg->connect.nm_m); |
| 1138 | msg->connect.nm_m = NULL; |
| 1139 | } |
| 1140 | if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { |
| 1141 | kfree(msg->connect.nm_nam, M_LWKTMSG); |
| 1142 | msg->connect.nm_nam = NULL; |
| 1143 | } |
| 1144 | lwkt_replymsg(&msg->connect.base.lmsg, error); |
| 1145 | /* msg invalid now */ |
| 1146 | } |
| 1147 | |
| 1148 | #ifdef INET6 |
| 1149 | |
| 1150 | static void |
| 1151 | tcp6_connect(netmsg_t msg) |
| 1152 | { |
| 1153 | struct tcpcb *tp; |
| 1154 | struct socket *so = msg->connect.base.nm_so; |
| 1155 | struct sockaddr *nam = msg->connect.nm_nam; |
| 1156 | struct thread *td = msg->connect.nm_td; |
| 1157 | struct inpcb *inp; |
| 1158 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; |
| 1159 | struct in6_addr *addr6; |
| 1160 | #ifdef SMP |
| 1161 | lwkt_port_t port; |
| 1162 | #endif |
| 1163 | int error; |
| 1164 | |
| 1165 | COMMON_START(so, inp, 0); |
| 1166 | |
| 1167 | /* |
| 1168 | * Reconnect our pcb if we have to |
| 1169 | */ |
| 1170 | if (msg->connect.nm_reconnect & NMSG_RECONNECT_RECONNECT) { |
| 1171 | msg->connect.nm_reconnect &= ~NMSG_RECONNECT_RECONNECT; |
| 1172 | in_pcblink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Bind if we have to |
| 1177 | */ |
| 1178 | if (inp->inp_lport == 0) { |
| 1179 | error = in6_pcbbind(inp, NULL, td); |
| 1180 | if (error) |
| 1181 | goto out; |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Cannot simply call in_pcbconnect, because there might be an |
| 1186 | * earlier incarnation of this same connection still in |
| 1187 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 1188 | */ |
| 1189 | error = in6_pcbladdr(inp, nam, &addr6, td); |
| 1190 | if (error) |
| 1191 | goto out; |
| 1192 | |
| 1193 | #ifdef SMP |
| 1194 | port = tcp6_addrport(); /* XXX hack for now, always cpu0 */ |
| 1195 | |
| 1196 | if (port != &curthread->td_msgport) { |
| 1197 | struct route *ro = &inp->inp_route; |
| 1198 | |
| 1199 | /* |
| 1200 | * in_pcbladdr() may have allocated a route entry for us |
| 1201 | * on the current CPU, but we need a route entry on the |
| 1202 | * inpcb's owner CPU, so free it here. |
| 1203 | */ |
| 1204 | if (ro->ro_rt != NULL) |
| 1205 | RTFREE(ro->ro_rt); |
| 1206 | bzero(ro, sizeof(*ro)); |
| 1207 | |
| 1208 | in_pcbunlink(so->so_pcb, &tcbinfo[mycpu->gd_cpuid]); |
| 1209 | sosetport(so, port); |
| 1210 | msg->connect.nm_reconnect |= NMSG_RECONNECT_RECONNECT; |
| 1211 | msg->connect.base.nm_dispatch = tcp6_connect; |
| 1212 | |
| 1213 | lwkt_forwardmsg(port, &msg->connect.base.lmsg); |
| 1214 | /* msg invalid now */ |
| 1215 | return; |
| 1216 | } |
| 1217 | #endif |
| 1218 | error = tcp6_connect_oncpu(tp, msg->connect.nm_flags, |
| 1219 | &msg->connect.nm_m, sin6, addr6); |
| 1220 | /* nm_m may still be intact */ |
| 1221 | out: |
| 1222 | if (error && (msg->connect.nm_reconnect & NMSG_RECONNECT_FALLBACK)) { |
| 1223 | tcp_connect(msg); |
| 1224 | /* msg invalid now */ |
| 1225 | } else { |
| 1226 | if (msg->connect.nm_m) { |
| 1227 | m_freem(msg->connect.nm_m); |
| 1228 | msg->connect.nm_m = NULL; |
| 1229 | } |
| 1230 | if (msg->connect.nm_reconnect & NMSG_RECONNECT_NAMALLOC) { |
| 1231 | kfree(msg->connect.nm_nam, M_LWKTMSG); |
| 1232 | msg->connect.nm_nam = NULL; |
| 1233 | } |
| 1234 | lwkt_replymsg(&msg->connect.base.lmsg, error); |
| 1235 | /* msg invalid now */ |
| 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | static int |
| 1240 | tcp6_connect_oncpu(struct tcpcb *tp, int flags, struct mbuf **mp, |
| 1241 | struct sockaddr_in6 *sin6, struct in6_addr *addr6) |
| 1242 | { |
| 1243 | struct mbuf *m = *mp; |
| 1244 | struct inpcb *inp = tp->t_inpcb; |
| 1245 | struct socket *so = inp->inp_socket; |
| 1246 | struct inpcb *oinp; |
| 1247 | |
| 1248 | /* |
| 1249 | * Cannot simply call in_pcbconnect, because there might be an |
| 1250 | * earlier incarnation of this same connection still in |
| 1251 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 1252 | */ |
| 1253 | oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, |
| 1254 | &sin6->sin6_addr, sin6->sin6_port, |
| 1255 | (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? |
| 1256 | addr6 : &inp->in6p_laddr), |
| 1257 | inp->inp_lport, 0, NULL); |
| 1258 | if (oinp) |
| 1259 | return (EADDRINUSE); |
| 1260 | |
| 1261 | if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) |
| 1262 | inp->in6p_laddr = *addr6; |
| 1263 | inp->in6p_faddr = sin6->sin6_addr; |
| 1264 | inp->inp_fport = sin6->sin6_port; |
| 1265 | if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != 0) |
| 1266 | inp->in6p_flowinfo = sin6->sin6_flowinfo; |
| 1267 | in_pcbinsconnhash(inp); |
| 1268 | |
| 1269 | /* |
| 1270 | * Now that no more errors can occur, change the protocol processing |
| 1271 | * port to the current thread (which is the correct thread). |
| 1272 | * |
| 1273 | * Create TCP timer message now; we are on the tcpcb's owner |
| 1274 | * CPU/thread. |
| 1275 | */ |
| 1276 | tcp_create_timermsg(tp, &curthread->td_msgport); |
| 1277 | |
| 1278 | /* Compute window scaling to request. */ |
| 1279 | if (tp->request_r_scale < TCP_MIN_WINSHIFT) |
| 1280 | tp->request_r_scale = TCP_MIN_WINSHIFT; |
| 1281 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 1282 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.ssb_hiwat) { |
| 1283 | tp->request_r_scale++; |
| 1284 | } |
| 1285 | |
| 1286 | soisconnecting(so); |
| 1287 | tcpstat.tcps_connattempt++; |
| 1288 | tp->t_state = TCPS_SYN_SENT; |
| 1289 | tcp_callout_reset(tp, tp->tt_keep, tp->t_keepinit, tcp_timer_keep); |
| 1290 | tp->iss = tcp_new_isn(tp); |
| 1291 | tcp_sendseqinit(tp); |
| 1292 | if (m) { |
| 1293 | ssb_appendstream(&so->so_snd, m); |
| 1294 | *mp = NULL; |
| 1295 | if (flags & PRUS_OOB) |
| 1296 | tp->snd_up = tp->snd_una + so->so_snd.ssb_cc; |
| 1297 | } |
| 1298 | |
| 1299 | /* |
| 1300 | * Close the send side of the connection after |
| 1301 | * the data is sent if flagged. |
| 1302 | */ |
| 1303 | if ((flags & (PRUS_OOB|PRUS_EOF)) == PRUS_EOF) { |
| 1304 | socantsendmore(so); |
| 1305 | tp = tcp_usrclosed(tp); |
| 1306 | } |
| 1307 | return (tcp_output(tp)); |
| 1308 | } |
| 1309 | |
| 1310 | #endif /* INET6 */ |
| 1311 | |
| 1312 | /* |
| 1313 | * The new sockopt interface makes it possible for us to block in the |
| 1314 | * copyin/out step (if we take a page fault). Taking a page fault while |
| 1315 | * in a critical section is probably a Bad Thing. (Since sockets and pcbs |
| 1316 | * both now use TSM, there probably isn't any need for this function to |
| 1317 | * run in a critical section any more. This needs more examination.) |
| 1318 | */ |
| 1319 | void |
| 1320 | tcp_ctloutput(netmsg_t msg) |
| 1321 | { |
| 1322 | struct socket *so = msg->base.nm_so; |
| 1323 | struct sockopt *sopt = msg->ctloutput.nm_sopt; |
| 1324 | int error, opt, optval, opthz; |
| 1325 | struct inpcb *inp; |
| 1326 | struct tcpcb *tp; |
| 1327 | |
| 1328 | error = 0; |
| 1329 | inp = so->so_pcb; |
| 1330 | if (inp == NULL) { |
| 1331 | error = ECONNRESET; |
| 1332 | goto done; |
| 1333 | } |
| 1334 | |
| 1335 | if (sopt->sopt_level != IPPROTO_TCP) { |
| 1336 | #ifdef INET6 |
| 1337 | if (INP_CHECK_SOCKAF(so, AF_INET6)) |
| 1338 | ip6_ctloutput_dispatch(msg); |
| 1339 | else |
| 1340 | #endif /* INET6 */ |
| 1341 | ip_ctloutput(msg); |
| 1342 | /* msg invalid now */ |
| 1343 | return; |
| 1344 | } |
| 1345 | tp = intotcpcb(inp); |
| 1346 | |
| 1347 | switch (sopt->sopt_dir) { |
| 1348 | case SOPT_SET: |
| 1349 | error = soopt_to_kbuf(sopt, &optval, sizeof optval, |
| 1350 | sizeof optval); |
| 1351 | if (error) |
| 1352 | break; |
| 1353 | switch (sopt->sopt_name) { |
| 1354 | case TCP_FASTKEEP: |
| 1355 | if (optval > 0) |
| 1356 | tp->t_keepidle = tp->t_keepintvl; |
| 1357 | else |
| 1358 | tp->t_keepidle = tcp_keepidle; |
| 1359 | tcp_timer_keep_activity(tp, 0); |
| 1360 | break; |
| 1361 | #ifdef TCP_SIGNATURE |
| 1362 | case TCP_SIGNATURE_ENABLE: |
| 1363 | if (tp->t_state == TCPS_CLOSED) { |
| 1364 | /* |
| 1365 | * This is the only safe state that this |
| 1366 | * option could be changed. Some segments |
| 1367 | * could already have been sent in other |
| 1368 | * states. |
| 1369 | */ |
| 1370 | if (optval > 0) |
| 1371 | tp->t_flags |= TF_SIGNATURE; |
| 1372 | else |
| 1373 | tp->t_flags &= ~TF_SIGNATURE; |
| 1374 | } else { |
| 1375 | error = EOPNOTSUPP; |
| 1376 | } |
| 1377 | break; |
| 1378 | #endif /* TCP_SIGNATURE */ |
| 1379 | case TCP_NODELAY: |
| 1380 | case TCP_NOOPT: |
| 1381 | switch (sopt->sopt_name) { |
| 1382 | case TCP_NODELAY: |
| 1383 | opt = TF_NODELAY; |
| 1384 | break; |
| 1385 | case TCP_NOOPT: |
| 1386 | opt = TF_NOOPT; |
| 1387 | break; |
| 1388 | default: |
| 1389 | opt = 0; /* dead code to fool gcc */ |
| 1390 | break; |
| 1391 | } |
| 1392 | |
| 1393 | if (optval) |
| 1394 | tp->t_flags |= opt; |
| 1395 | else |
| 1396 | tp->t_flags &= ~opt; |
| 1397 | break; |
| 1398 | |
| 1399 | case TCP_NOPUSH: |
| 1400 | if (tcp_disable_nopush) |
| 1401 | break; |
| 1402 | if (optval) |
| 1403 | tp->t_flags |= TF_NOPUSH; |
| 1404 | else { |
| 1405 | tp->t_flags &= ~TF_NOPUSH; |
| 1406 | error = tcp_output(tp); |
| 1407 | } |
| 1408 | break; |
| 1409 | |
| 1410 | case TCP_MAXSEG: |
| 1411 | /* |
| 1412 | * Must be between 0 and maxseg. If the requested |
| 1413 | * maxseg is too small to satisfy the desired minmss, |
| 1414 | * pump it up (silently so sysctl modifications of |
| 1415 | * minmss do not create unexpected program failures). |
| 1416 | * Handle degenerate cases. |
| 1417 | */ |
| 1418 | if (optval > 0 && optval <= tp->t_maxseg) { |
| 1419 | if (optval + 40 < tcp_minmss) { |
| 1420 | optval = tcp_minmss - 40; |
| 1421 | if (optval < 0) |
| 1422 | optval = 1; |
| 1423 | } |
| 1424 | tp->t_maxseg = optval; |
| 1425 | } else { |
| 1426 | error = EINVAL; |
| 1427 | } |
| 1428 | break; |
| 1429 | |
| 1430 | case TCP_KEEPINIT: |
| 1431 | opthz = ((int64_t)optval * hz) / 1000; |
| 1432 | if (opthz >= 1) |
| 1433 | tp->t_keepinit = opthz; |
| 1434 | else |
| 1435 | error = EINVAL; |
| 1436 | break; |
| 1437 | |
| 1438 | case TCP_KEEPIDLE: |
| 1439 | opthz = ((int64_t)optval * hz) / 1000; |
| 1440 | if (opthz >= 1) { |
| 1441 | tp->t_keepidle = opthz; |
| 1442 | tcp_timer_keep_activity(tp, 0); |
| 1443 | } else { |
| 1444 | error = EINVAL; |
| 1445 | } |
| 1446 | break; |
| 1447 | |
| 1448 | case TCP_KEEPINTVL: |
| 1449 | opthz = ((int64_t)optval * hz) / 1000; |
| 1450 | if (opthz >= 1) { |
| 1451 | tp->t_keepintvl = opthz; |
| 1452 | tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; |
| 1453 | } else { |
| 1454 | error = EINVAL; |
| 1455 | } |
| 1456 | break; |
| 1457 | |
| 1458 | case TCP_KEEPCNT: |
| 1459 | if (optval > 0) { |
| 1460 | tp->t_keepcnt = optval; |
| 1461 | tp->t_maxidle = tp->t_keepintvl * tp->t_keepcnt; |
| 1462 | } else { |
| 1463 | error = EINVAL; |
| 1464 | } |
| 1465 | break; |
| 1466 | |
| 1467 | default: |
| 1468 | error = ENOPROTOOPT; |
| 1469 | break; |
| 1470 | } |
| 1471 | break; |
| 1472 | |
| 1473 | case SOPT_GET: |
| 1474 | switch (sopt->sopt_name) { |
| 1475 | #ifdef TCP_SIGNATURE |
| 1476 | case TCP_SIGNATURE_ENABLE: |
| 1477 | optval = (tp->t_flags & TF_SIGNATURE) ? 1 : 0; |
| 1478 | break; |
| 1479 | #endif /* TCP_SIGNATURE */ |
| 1480 | case TCP_NODELAY: |
| 1481 | optval = tp->t_flags & TF_NODELAY; |
| 1482 | break; |
| 1483 | case TCP_MAXSEG: |
| 1484 | optval = tp->t_maxseg; |
| 1485 | break; |
| 1486 | case TCP_NOOPT: |
| 1487 | optval = tp->t_flags & TF_NOOPT; |
| 1488 | break; |
| 1489 | case TCP_NOPUSH: |
| 1490 | optval = tp->t_flags & TF_NOPUSH; |
| 1491 | break; |
| 1492 | case TCP_KEEPINIT: |
| 1493 | optval = ((int64_t)tp->t_keepinit * 1000) / hz; |
| 1494 | break; |
| 1495 | case TCP_KEEPIDLE: |
| 1496 | optval = ((int64_t)tp->t_keepidle * 1000) / hz; |
| 1497 | break; |
| 1498 | case TCP_KEEPINTVL: |
| 1499 | optval = ((int64_t)tp->t_keepintvl * 1000) / hz; |
| 1500 | break; |
| 1501 | case TCP_KEEPCNT: |
| 1502 | optval = tp->t_keepcnt; |
| 1503 | break; |
| 1504 | default: |
| 1505 | error = ENOPROTOOPT; |
| 1506 | break; |
| 1507 | } |
| 1508 | if (error == 0) |
| 1509 | soopt_from_kbuf(sopt, &optval, sizeof optval); |
| 1510 | break; |
| 1511 | } |
| 1512 | done: |
| 1513 | lwkt_replymsg(&msg->lmsg, error); |
| 1514 | } |
| 1515 | |
| 1516 | /* |
| 1517 | * tcp_sendspace and tcp_recvspace are the default send and receive window |
| 1518 | * sizes, respectively. These are obsolescent (this information should |
| 1519 | * be set by the route). |
| 1520 | * |
| 1521 | * Use a default that does not require tcp window scaling to be turned |
| 1522 | * on. Individual programs or the administrator can increase the default. |
| 1523 | */ |
| 1524 | u_long tcp_sendspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ |
| 1525 | SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, |
| 1526 | &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); |
| 1527 | u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ |
| 1528 | SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, |
| 1529 | &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); |
| 1530 | |
| 1531 | /* |
| 1532 | * Attach TCP protocol to socket, allocating internet protocol control |
| 1533 | * block, tcp control block, bufer space, and entering LISTEN state |
| 1534 | * if to accept connections. |
| 1535 | */ |
| 1536 | static int |
| 1537 | tcp_attach(struct socket *so, struct pru_attach_info *ai) |
| 1538 | { |
| 1539 | struct tcpcb *tp; |
| 1540 | struct inpcb *inp; |
| 1541 | int error; |
| 1542 | int cpu; |
| 1543 | #ifdef INET6 |
| 1544 | int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != 0; |
| 1545 | #endif |
| 1546 | |
| 1547 | if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { |
| 1548 | lwkt_gettoken(&so->so_rcv.ssb_token); |
| 1549 | error = soreserve(so, tcp_sendspace, tcp_recvspace, |
| 1550 | ai->sb_rlimit); |
| 1551 | lwkt_reltoken(&so->so_rcv.ssb_token); |
| 1552 | if (error) |
| 1553 | return (error); |
| 1554 | } |
| 1555 | atomic_set_int(&so->so_rcv.ssb_flags, SSB_AUTOSIZE); |
| 1556 | atomic_set_int(&so->so_snd.ssb_flags, SSB_AUTOSIZE); |
| 1557 | cpu = mycpu->gd_cpuid; |
| 1558 | |
| 1559 | /* |
| 1560 | * Set the default port for protocol processing. This will likely |
| 1561 | * change when we connect. |
| 1562 | */ |
| 1563 | error = in_pcballoc(so, &tcbinfo[cpu]); |
| 1564 | if (error) |
| 1565 | return (error); |
| 1566 | inp = so->so_pcb; |
| 1567 | #ifdef INET6 |
| 1568 | if (isipv6) { |
| 1569 | inp->inp_vflag |= INP_IPV6; |
| 1570 | inp->in6p_hops = -1; /* use kernel default */ |
| 1571 | } |
| 1572 | else |
| 1573 | #endif |
| 1574 | inp->inp_vflag |= INP_IPV4; |
| 1575 | tp = tcp_newtcpcb(inp); |
| 1576 | if (tp == NULL) { |
| 1577 | /* |
| 1578 | * Make sure the socket is destroyed by the pcbdetach. |
| 1579 | */ |
| 1580 | soreference(so); |
| 1581 | #ifdef INET6 |
| 1582 | if (isipv6) |
| 1583 | in6_pcbdetach(inp); |
| 1584 | else |
| 1585 | #endif |
| 1586 | in_pcbdetach(inp); |
| 1587 | sofree(so); /* from ref above */ |
| 1588 | return (ENOBUFS); |
| 1589 | } |
| 1590 | tp->t_state = TCPS_CLOSED; |
| 1591 | return (0); |
| 1592 | } |
| 1593 | |
| 1594 | /* |
| 1595 | * Initiate (or continue) disconnect. |
| 1596 | * If embryonic state, just send reset (once). |
| 1597 | * If in ``let data drain'' option and linger null, just drop. |
| 1598 | * Otherwise (hard), mark socket disconnecting and drop |
| 1599 | * current input data; switch states based on user close, and |
| 1600 | * send segment to peer (with FIN). |
| 1601 | */ |
| 1602 | static struct tcpcb * |
| 1603 | tcp_disconnect(struct tcpcb *tp) |
| 1604 | { |
| 1605 | struct socket *so = tp->t_inpcb->inp_socket; |
| 1606 | |
| 1607 | if (tp->t_state < TCPS_ESTABLISHED) { |
| 1608 | tp = tcp_close(tp); |
| 1609 | } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { |
| 1610 | tp = tcp_drop(tp, 0); |
| 1611 | } else { |
| 1612 | lwkt_gettoken(&so->so_rcv.ssb_token); |
| 1613 | soisdisconnecting(so); |
| 1614 | sbflush(&so->so_rcv.sb); |
| 1615 | tp = tcp_usrclosed(tp); |
| 1616 | if (tp) |
| 1617 | tcp_output(tp); |
| 1618 | lwkt_reltoken(&so->so_rcv.ssb_token); |
| 1619 | } |
| 1620 | return (tp); |
| 1621 | } |
| 1622 | |
| 1623 | /* |
| 1624 | * User issued close, and wish to trail through shutdown states: |
| 1625 | * if never received SYN, just forget it. If got a SYN from peer, |
| 1626 | * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. |
| 1627 | * If already got a FIN from peer, then almost done; go to LAST_ACK |
| 1628 | * state. In all other cases, have already sent FIN to peer (e.g. |
| 1629 | * after PRU_SHUTDOWN), and just have to play tedious game waiting |
| 1630 | * for peer to send FIN or not respond to keep-alives, etc. |
| 1631 | * We can let the user exit from the close as soon as the FIN is acked. |
| 1632 | */ |
| 1633 | static struct tcpcb * |
| 1634 | tcp_usrclosed(struct tcpcb *tp) |
| 1635 | { |
| 1636 | |
| 1637 | switch (tp->t_state) { |
| 1638 | |
| 1639 | case TCPS_CLOSED: |
| 1640 | case TCPS_LISTEN: |
| 1641 | tp->t_state = TCPS_CLOSED; |
| 1642 | tp = tcp_close(tp); |
| 1643 | break; |
| 1644 | |
| 1645 | case TCPS_SYN_SENT: |
| 1646 | case TCPS_SYN_RECEIVED: |
| 1647 | tp->t_flags |= TF_NEEDFIN; |
| 1648 | break; |
| 1649 | |
| 1650 | case TCPS_ESTABLISHED: |
| 1651 | tp->t_state = TCPS_FIN_WAIT_1; |
| 1652 | break; |
| 1653 | |
| 1654 | case TCPS_CLOSE_WAIT: |
| 1655 | tp->t_state = TCPS_LAST_ACK; |
| 1656 | break; |
| 1657 | } |
| 1658 | if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { |
| 1659 | soisdisconnected(tp->t_inpcb->inp_socket); |
| 1660 | /* To prevent the connection hanging in FIN_WAIT_2 forever. */ |
| 1661 | if (tp->t_state == TCPS_FIN_WAIT_2) { |
| 1662 | tcp_callout_reset(tp, tp->tt_2msl, tp->t_maxidle, |
| 1663 | tcp_timer_2msl); |
| 1664 | } |
| 1665 | } |
| 1666 | return (tp); |
| 1667 | } |