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sys/netinet/tcp_usrreq.c
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1 /*- 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. 4 * Copyright (c) 2006-2007 Robert N. M. Watson 5 * Copyright (c) 2010-2011 Juniper Networks, Inc. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Robert N. M. Watson under 9 * contract to Juniper Networks, Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/11.2/sys/netinet/tcp_usrreq.c 338980 2018-09-27 18:34:42Z gordon $"); 40 41 #include "opt_ddb.h" 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 #include "opt_ipsec.h" 45 #include "opt_tcpdebug.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/limits.h> 50 #include <sys/malloc.h> 51 #include <sys/refcount.h> 52 #include <sys/kernel.h> 53 #include <sys/sysctl.h> 54 #include <sys/mbuf.h> 55 #ifdef INET6 56 #include <sys/domain.h> 57 #endif /* INET6 */ 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/protosw.h> 61 #include <sys/proc.h> 62 #include <sys/jail.h> 63 #include <sys/syslog.h> 64 65 #ifdef DDB 66 #include <ddb/ddb.h> 67 #endif 68 69 #include <net/if.h> 70 #include <net/if_var.h> 71 #include <net/route.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_kdtrace.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/in_systm.h> 78 #include <netinet/in_var.h> 79 #include <netinet/ip_var.h> 80 #ifdef INET6 81 #include <netinet/ip6.h> 82 #include <netinet6/in6_pcb.h> 83 #include <netinet6/ip6_var.h> 84 #include <netinet6/scope6_var.h> 85 #endif 86 #ifdef TCP_RFC7413 87 #include <netinet/tcp_fastopen.h> 88 #endif 89 #include <netinet/tcp.h> 90 #include <netinet/tcp_fsm.h> 91 #include <netinet/tcp_seq.h> 92 #include <netinet/tcp_timer.h> 93 #include <netinet/tcp_var.h> 94 #include <netinet/tcpip.h> 95 #include <netinet/cc/cc.h> 96 #ifdef TCPPCAP 97 #include <netinet/tcp_pcap.h> 98 #endif 99 #ifdef TCPDEBUG 100 #include <netinet/tcp_debug.h> 101 #endif 102 #ifdef TCP_OFFLOAD 103 #include <netinet/tcp_offload.h> 104 #endif 105 #include <netipsec/ipsec_support.h> 106 107 /* 108 * TCP protocol interface to socket abstraction. 109 */ 110 static int tcp_attach(struct socket *); 111 #ifdef INET 112 static int tcp_connect(struct tcpcb *, struct sockaddr *, 113 struct thread *td); 114 #endif /* INET */ 115 #ifdef INET6 116 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 117 struct thread *td); 118 #endif /* INET6 */ 119 static void tcp_disconnect(struct tcpcb *); 120 static void tcp_usrclosed(struct tcpcb *); 121 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 122 123 #ifdef TCPDEBUG 124 #define TCPDEBUG0 int ostate = 0 125 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 126 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 127 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 128 #else 129 #define TCPDEBUG0 130 #define TCPDEBUG1() 131 #define TCPDEBUG2(req) 132 #endif 133 134 /* 135 * TCP attaches to socket via pru_attach(), reserving space, 136 * and an internet control block. 137 */ 138 static int 139 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 140 { 141 struct inpcb *inp; 142 struct tcpcb *tp = NULL; 143 int error; 144 TCPDEBUG0; 145 146 inp = sotoinpcb(so); 147 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 148 TCPDEBUG1(); 149 150 error = tcp_attach(so); 151 if (error) 152 goto out; 153 154 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 155 so->so_linger = TCP_LINGERTIME; 156 157 inp = sotoinpcb(so); 158 tp = intotcpcb(inp); 159 out: 160 TCPDEBUG2(PRU_ATTACH); 161 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 162 return error; 163 } 164 165 /* 166 * tcp_detach is called when the socket layer loses its final reference 167 * to the socket, be it a file descriptor reference, a reference from TCP, 168 * etc. At this point, there is only one case in which we will keep around 169 * inpcb state: time wait. 170 * 171 * This function can probably be re-absorbed back into tcp_usr_detach() now 172 * that there is a single detach path. 173 */ 174 static void 175 tcp_detach(struct socket *so, struct inpcb *inp) 176 { 177 struct tcpcb *tp; 178 179 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 180 INP_WLOCK_ASSERT(inp); 181 182 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 183 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 184 185 tp = intotcpcb(inp); 186 187 if (inp->inp_flags & INP_TIMEWAIT) { 188 /* 189 * There are two cases to handle: one in which the time wait 190 * state is being discarded (INP_DROPPED), and one in which 191 * this connection will remain in timewait. In the former, 192 * it is time to discard all state (except tcptw, which has 193 * already been discarded by the timewait close code, which 194 * should be further up the call stack somewhere). In the 195 * latter case, we detach from the socket, but leave the pcb 196 * present until timewait ends. 197 * 198 * XXXRW: Would it be cleaner to free the tcptw here? 199 * 200 * Astute question indeed, from twtcp perspective there are 201 * three cases to consider: 202 * 203 * #1 tcp_detach is called at tcptw creation time by 204 * tcp_twstart, then do not discard the newly created tcptw 205 * and leave inpcb present until timewait ends 206 * #2 tcp_detach is called at timewait end (or reuse) by 207 * tcp_twclose, then the tcptw has already been discarded 208 * (or reused) and inpcb is freed here 209 * #3 tcp_detach is called() after timewait ends (or reuse) 210 * (e.g. by soclose), then tcptw has already been discarded 211 * (or reused) and inpcb is freed here 212 * 213 * In all three cases the tcptw should not be freed here. 214 */ 215 if (inp->inp_flags & INP_DROPPED) { 216 in_pcbdetach(inp); 217 if (__predict_true(tp == NULL)) { 218 in_pcbfree(inp); 219 } else { 220 /* 221 * This case should not happen as in TIMEWAIT 222 * state the inp should not be destroyed before 223 * its tcptw. If INVARIANTS is defined, panic. 224 */ 225 #ifdef INVARIANTS 226 panic("%s: Panic before an inp double-free: " 227 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 228 , __func__); 229 #else 230 log(LOG_ERR, "%s: Avoid an inp double-free: " 231 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 232 , __func__); 233 #endif 234 INP_WUNLOCK(inp); 235 } 236 } else { 237 in_pcbdetach(inp); 238 INP_WUNLOCK(inp); 239 } 240 } else { 241 /* 242 * If the connection is not in timewait, we consider two 243 * two conditions: one in which no further processing is 244 * necessary (dropped || embryonic), and one in which TCP is 245 * not yet done, but no longer requires the socket, so the 246 * pcb will persist for the time being. 247 * 248 * XXXRW: Does the second case still occur? 249 */ 250 if (inp->inp_flags & INP_DROPPED || 251 tp->t_state < TCPS_SYN_SENT) { 252 tcp_discardcb(tp); 253 in_pcbdetach(inp); 254 in_pcbfree(inp); 255 } else { 256 in_pcbdetach(inp); 257 INP_WUNLOCK(inp); 258 } 259 } 260 } 261 262 /* 263 * pru_detach() detaches the TCP protocol from the socket. 264 * If the protocol state is non-embryonic, then can't 265 * do this directly: have to initiate a pru_disconnect(), 266 * which may finish later; embryonic TCB's can just 267 * be discarded here. 268 */ 269 static void 270 tcp_usr_detach(struct socket *so) 271 { 272 struct inpcb *inp; 273 int rlock = 0; 274 275 inp = sotoinpcb(so); 276 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 277 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 278 INP_INFO_RLOCK(&V_tcbinfo); 279 rlock = 1; 280 } 281 INP_WLOCK(inp); 282 KASSERT(inp->inp_socket != NULL, 283 ("tcp_usr_detach: inp_socket == NULL")); 284 tcp_detach(so, inp); 285 if (rlock) 286 INP_INFO_RUNLOCK(&V_tcbinfo); 287 } 288 289 #ifdef INET 290 /* 291 * Give the socket an address. 292 */ 293 static int 294 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 295 { 296 int error = 0; 297 struct inpcb *inp; 298 struct tcpcb *tp = NULL; 299 struct sockaddr_in *sinp; 300 301 sinp = (struct sockaddr_in *)nam; 302 if (nam->sa_len != sizeof (*sinp)) 303 return (EINVAL); 304 /* 305 * Must check for multicast addresses and disallow binding 306 * to them. 307 */ 308 if (sinp->sin_family == AF_INET && 309 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 310 return (EAFNOSUPPORT); 311 312 TCPDEBUG0; 313 inp = sotoinpcb(so); 314 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 315 INP_WLOCK(inp); 316 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 317 error = EINVAL; 318 goto out; 319 } 320 tp = intotcpcb(inp); 321 TCPDEBUG1(); 322 INP_HASH_WLOCK(&V_tcbinfo); 323 error = in_pcbbind(inp, nam, td->td_ucred); 324 INP_HASH_WUNLOCK(&V_tcbinfo); 325 out: 326 TCPDEBUG2(PRU_BIND); 327 TCP_PROBE2(debug__user, tp, PRU_BIND); 328 INP_WUNLOCK(inp); 329 330 return (error); 331 } 332 #endif /* INET */ 333 334 #ifdef INET6 335 static int 336 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 337 { 338 int error = 0; 339 struct inpcb *inp; 340 struct tcpcb *tp = NULL; 341 struct sockaddr_in6 *sin6p; 342 u_char vflagsav; 343 344 sin6p = (struct sockaddr_in6 *)nam; 345 if (nam->sa_len != sizeof (*sin6p)) 346 return (EINVAL); 347 /* 348 * Must check for multicast addresses and disallow binding 349 * to them. 350 */ 351 if (sin6p->sin6_family == AF_INET6 && 352 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 353 return (EAFNOSUPPORT); 354 355 TCPDEBUG0; 356 inp = sotoinpcb(so); 357 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 358 INP_WLOCK(inp); 359 vflagsav = inp->inp_vflag; 360 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 361 error = EINVAL; 362 goto out; 363 } 364 tp = intotcpcb(inp); 365 TCPDEBUG1(); 366 INP_HASH_WLOCK(&V_tcbinfo); 367 inp->inp_vflag &= ~INP_IPV4; 368 inp->inp_vflag |= INP_IPV6; 369 #ifdef INET 370 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 371 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 372 inp->inp_vflag |= INP_IPV4; 373 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 374 struct sockaddr_in sin; 375 376 in6_sin6_2_sin(&sin, sin6p); 377 inp->inp_vflag |= INP_IPV4; 378 inp->inp_vflag &= ~INP_IPV6; 379 error = in_pcbbind(inp, (struct sockaddr *)&sin, 380 td->td_ucred); 381 INP_HASH_WUNLOCK(&V_tcbinfo); 382 goto out; 383 } 384 } 385 #endif 386 error = in6_pcbbind(inp, nam, td->td_ucred); 387 INP_HASH_WUNLOCK(&V_tcbinfo); 388 out: 389 if (error != 0) 390 inp->inp_vflag = vflagsav; 391 TCPDEBUG2(PRU_BIND); 392 TCP_PROBE2(debug__user, tp, PRU_BIND); 393 INP_WUNLOCK(inp); 394 return (error); 395 } 396 #endif /* INET6 */ 397 398 #ifdef INET 399 /* 400 * Prepare to accept connections. 401 */ 402 static int 403 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 404 { 405 int error = 0; 406 struct inpcb *inp; 407 struct tcpcb *tp = NULL; 408 409 TCPDEBUG0; 410 inp = sotoinpcb(so); 411 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 412 INP_WLOCK(inp); 413 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 414 error = EINVAL; 415 goto out; 416 } 417 tp = intotcpcb(inp); 418 TCPDEBUG1(); 419 SOCK_LOCK(so); 420 error = solisten_proto_check(so); 421 INP_HASH_WLOCK(&V_tcbinfo); 422 if (error == 0 && inp->inp_lport == 0) 423 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 424 INP_HASH_WUNLOCK(&V_tcbinfo); 425 if (error == 0) { 426 tcp_state_change(tp, TCPS_LISTEN); 427 solisten_proto(so, backlog); 428 #ifdef TCP_OFFLOAD 429 if ((so->so_options & SO_NO_OFFLOAD) == 0) 430 tcp_offload_listen_start(tp); 431 #endif 432 } 433 SOCK_UNLOCK(so); 434 435 #ifdef TCP_RFC7413 436 if (tp->t_flags & TF_FASTOPEN) 437 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 438 #endif 439 out: 440 TCPDEBUG2(PRU_LISTEN); 441 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 442 INP_WUNLOCK(inp); 443 return (error); 444 } 445 #endif /* INET */ 446 447 #ifdef INET6 448 static int 449 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 450 { 451 int error = 0; 452 struct inpcb *inp; 453 struct tcpcb *tp = NULL; 454 u_char vflagsav; 455 456 TCPDEBUG0; 457 inp = sotoinpcb(so); 458 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 459 INP_WLOCK(inp); 460 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 461 error = EINVAL; 462 goto out; 463 } 464 vflagsav = inp->inp_vflag; 465 tp = intotcpcb(inp); 466 TCPDEBUG1(); 467 SOCK_LOCK(so); 468 error = solisten_proto_check(so); 469 INP_HASH_WLOCK(&V_tcbinfo); 470 if (error == 0 && inp->inp_lport == 0) { 471 inp->inp_vflag &= ~INP_IPV4; 472 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 473 inp->inp_vflag |= INP_IPV4; 474 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 475 } 476 INP_HASH_WUNLOCK(&V_tcbinfo); 477 if (error == 0) { 478 tcp_state_change(tp, TCPS_LISTEN); 479 solisten_proto(so, backlog); 480 #ifdef TCP_OFFLOAD 481 if ((so->so_options & SO_NO_OFFLOAD) == 0) 482 tcp_offload_listen_start(tp); 483 #endif 484 } 485 SOCK_UNLOCK(so); 486 487 #ifdef TCP_RFC7413 488 if (tp->t_flags & TF_FASTOPEN) 489 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 490 #endif 491 if (error != 0) 492 inp->inp_vflag = vflagsav; 493 494 out: 495 TCPDEBUG2(PRU_LISTEN); 496 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 497 INP_WUNLOCK(inp); 498 return (error); 499 } 500 #endif /* INET6 */ 501 502 #ifdef INET 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 int 511 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 512 { 513 int error = 0; 514 struct inpcb *inp; 515 struct tcpcb *tp = NULL; 516 struct sockaddr_in *sinp; 517 518 sinp = (struct sockaddr_in *)nam; 519 if (nam->sa_len != sizeof (*sinp)) 520 return (EINVAL); 521 /* 522 * Must disallow TCP ``connections'' to multicast addresses. 523 */ 524 if (sinp->sin_family == AF_INET 525 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 526 return (EAFNOSUPPORT); 527 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 528 return (error); 529 530 TCPDEBUG0; 531 inp = sotoinpcb(so); 532 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 533 INP_WLOCK(inp); 534 if (inp->inp_flags & INP_TIMEWAIT) { 535 error = EADDRINUSE; 536 goto out; 537 } 538 if (inp->inp_flags & INP_DROPPED) { 539 error = ECONNREFUSED; 540 goto out; 541 } 542 tp = intotcpcb(inp); 543 TCPDEBUG1(); 544 if ((error = tcp_connect(tp, nam, td)) != 0) 545 goto out; 546 #ifdef TCP_OFFLOAD 547 if (registered_toedevs > 0 && 548 (so->so_options & SO_NO_OFFLOAD) == 0 && 549 (error = tcp_offload_connect(so, nam)) == 0) 550 goto out; 551 #endif 552 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 553 error = tp->t_fb->tfb_tcp_output(tp); 554 out: 555 TCPDEBUG2(PRU_CONNECT); 556 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 557 INP_WUNLOCK(inp); 558 return (error); 559 } 560 #endif /* INET */ 561 562 #ifdef INET6 563 static int 564 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 565 { 566 int error = 0; 567 struct inpcb *inp; 568 struct tcpcb *tp = NULL; 569 struct sockaddr_in6 *sin6p; 570 u_int8_t incflagsav; 571 u_char vflagsav; 572 573 TCPDEBUG0; 574 575 sin6p = (struct sockaddr_in6 *)nam; 576 if (nam->sa_len != sizeof (*sin6p)) 577 return (EINVAL); 578 /* 579 * Must disallow TCP ``connections'' to multicast addresses. 580 */ 581 if (sin6p->sin6_family == AF_INET6 582 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 583 return (EAFNOSUPPORT); 584 585 inp = sotoinpcb(so); 586 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 587 INP_WLOCK(inp); 588 vflagsav = inp->inp_vflag; 589 incflagsav = inp->inp_inc.inc_flags; 590 if (inp->inp_flags & INP_TIMEWAIT) { 591 error = EADDRINUSE; 592 goto out; 593 } 594 if (inp->inp_flags & INP_DROPPED) { 595 error = ECONNREFUSED; 596 goto out; 597 } 598 tp = intotcpcb(inp); 599 TCPDEBUG1(); 600 #ifdef INET 601 /* 602 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 603 * therefore probably require the hash lock, which isn't held here. 604 * Is this a significant problem? 605 */ 606 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 607 struct sockaddr_in sin; 608 609 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 610 error = EINVAL; 611 goto out; 612 } 613 if ((inp->inp_vflag & INP_IPV4) == 0) { 614 error = EAFNOSUPPORT; 615 goto out; 616 } 617 618 in6_sin6_2_sin(&sin, sin6p); 619 if ((error = prison_remote_ip4(td->td_ucred, 620 &sin.sin_addr)) != 0) 621 goto out; 622 inp->inp_vflag |= INP_IPV4; 623 inp->inp_vflag &= ~INP_IPV6; 624 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 625 goto out; 626 #ifdef TCP_OFFLOAD 627 if (registered_toedevs > 0 && 628 (so->so_options & SO_NO_OFFLOAD) == 0 && 629 (error = tcp_offload_connect(so, nam)) == 0) 630 goto out; 631 #endif 632 error = tp->t_fb->tfb_tcp_output(tp); 633 goto out; 634 } else { 635 if ((inp->inp_vflag & INP_IPV6) == 0) { 636 error = EAFNOSUPPORT; 637 goto out; 638 } 639 } 640 #endif 641 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 642 goto out; 643 inp->inp_vflag &= ~INP_IPV4; 644 inp->inp_vflag |= INP_IPV6; 645 inp->inp_inc.inc_flags |= INC_ISIPV6; 646 if ((error = tcp6_connect(tp, nam, td)) != 0) 647 goto out; 648 #ifdef TCP_OFFLOAD 649 if (registered_toedevs > 0 && 650 (so->so_options & SO_NO_OFFLOAD) == 0 && 651 (error = tcp_offload_connect(so, nam)) == 0) 652 goto out; 653 #endif 654 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 655 error = tp->t_fb->tfb_tcp_output(tp); 656 657 out: 658 /* 659 * If the implicit bind in the connect call fails, restore 660 * the flags we modified. 661 */ 662 if (error != 0 && inp->inp_lport == 0) { 663 inp->inp_vflag = vflagsav; 664 inp->inp_inc.inc_flags = incflagsav; 665 } 666 667 TCPDEBUG2(PRU_CONNECT); 668 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 669 INP_WUNLOCK(inp); 670 return (error); 671 } 672 #endif /* INET6 */ 673 674 /* 675 * Initiate disconnect from peer. 676 * If connection never passed embryonic stage, just drop; 677 * else if don't need to let data drain, then can just drop anyways, 678 * else have to begin TCP shutdown process: mark socket disconnecting, 679 * drain unread data, state switch to reflect user close, and 680 * send segment (e.g. FIN) to peer. Socket will be really disconnected 681 * when peer sends FIN and acks ours. 682 * 683 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 684 */ 685 static int 686 tcp_usr_disconnect(struct socket *so) 687 { 688 struct inpcb *inp; 689 struct tcpcb *tp = NULL; 690 int error = 0; 691 692 TCPDEBUG0; 693 INP_INFO_RLOCK(&V_tcbinfo); 694 inp = sotoinpcb(so); 695 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 696 INP_WLOCK(inp); 697 if (inp->inp_flags & INP_TIMEWAIT) 698 goto out; 699 if (inp->inp_flags & INP_DROPPED) { 700 error = ECONNRESET; 701 goto out; 702 } 703 tp = intotcpcb(inp); 704 TCPDEBUG1(); 705 tcp_disconnect(tp); 706 out: 707 TCPDEBUG2(PRU_DISCONNECT); 708 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 709 INP_WUNLOCK(inp); 710 INP_INFO_RUNLOCK(&V_tcbinfo); 711 return (error); 712 } 713 714 #ifdef INET 715 /* 716 * Accept a connection. Essentially all the work is done at higher levels; 717 * just return the address of the peer, storing through addr. 718 */ 719 static int 720 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 721 { 722 int error = 0; 723 struct inpcb *inp = NULL; 724 struct tcpcb *tp = NULL; 725 struct in_addr addr; 726 in_port_t port = 0; 727 TCPDEBUG0; 728 729 if (so->so_state & SS_ISDISCONNECTED) 730 return (ECONNABORTED); 731 732 inp = sotoinpcb(so); 733 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 734 INP_WLOCK(inp); 735 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 736 error = ECONNABORTED; 737 goto out; 738 } 739 tp = intotcpcb(inp); 740 TCPDEBUG1(); 741 742 /* 743 * We inline in_getpeeraddr and COMMON_END here, so that we can 744 * copy the data of interest and defer the malloc until after we 745 * release the lock. 746 */ 747 port = inp->inp_fport; 748 addr = inp->inp_faddr; 749 750 out: 751 TCPDEBUG2(PRU_ACCEPT); 752 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 753 INP_WUNLOCK(inp); 754 if (error == 0) 755 *nam = in_sockaddr(port, &addr); 756 return error; 757 } 758 #endif /* INET */ 759 760 #ifdef INET6 761 static int 762 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 763 { 764 struct inpcb *inp = NULL; 765 int error = 0; 766 struct tcpcb *tp = NULL; 767 struct in_addr addr; 768 struct in6_addr addr6; 769 in_port_t port = 0; 770 int v4 = 0; 771 TCPDEBUG0; 772 773 if (so->so_state & SS_ISDISCONNECTED) 774 return (ECONNABORTED); 775 776 inp = sotoinpcb(so); 777 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 778 INP_INFO_RLOCK(&V_tcbinfo); 779 INP_WLOCK(inp); 780 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 781 error = ECONNABORTED; 782 goto out; 783 } 784 tp = intotcpcb(inp); 785 TCPDEBUG1(); 786 787 /* 788 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 789 * copy the data of interest and defer the malloc until after we 790 * release the lock. 791 */ 792 if (inp->inp_vflag & INP_IPV4) { 793 v4 = 1; 794 port = inp->inp_fport; 795 addr = inp->inp_faddr; 796 } else { 797 port = inp->inp_fport; 798 addr6 = inp->in6p_faddr; 799 } 800 801 out: 802 TCPDEBUG2(PRU_ACCEPT); 803 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 804 INP_WUNLOCK(inp); 805 INP_INFO_RUNLOCK(&V_tcbinfo); 806 if (error == 0) { 807 if (v4) 808 *nam = in6_v4mapsin6_sockaddr(port, &addr); 809 else 810 *nam = in6_sockaddr(port, &addr6); 811 } 812 return error; 813 } 814 #endif /* INET6 */ 815 816 /* 817 * Mark the connection as being incapable of further output. 818 */ 819 static int 820 tcp_usr_shutdown(struct socket *so) 821 { 822 int error = 0; 823 struct inpcb *inp; 824 struct tcpcb *tp = NULL; 825 826 TCPDEBUG0; 827 INP_INFO_RLOCK(&V_tcbinfo); 828 inp = sotoinpcb(so); 829 KASSERT(inp != NULL, ("inp == NULL")); 830 INP_WLOCK(inp); 831 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 832 error = ECONNRESET; 833 goto out; 834 } 835 tp = intotcpcb(inp); 836 TCPDEBUG1(); 837 socantsendmore(so); 838 tcp_usrclosed(tp); 839 if (!(inp->inp_flags & INP_DROPPED)) 840 error = tp->t_fb->tfb_tcp_output(tp); 841 842 out: 843 TCPDEBUG2(PRU_SHUTDOWN); 844 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 845 INP_WUNLOCK(inp); 846 INP_INFO_RUNLOCK(&V_tcbinfo); 847 848 return (error); 849 } 850 851 /* 852 * After a receive, possibly send window update to peer. 853 */ 854 static int 855 tcp_usr_rcvd(struct socket *so, int flags) 856 { 857 struct inpcb *inp; 858 struct tcpcb *tp = NULL; 859 int error = 0; 860 861 TCPDEBUG0; 862 inp = sotoinpcb(so); 863 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 864 INP_WLOCK(inp); 865 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 866 error = ECONNRESET; 867 goto out; 868 } 869 tp = intotcpcb(inp); 870 TCPDEBUG1(); 871 #ifdef TCP_RFC7413 872 /* 873 * For passively-created TFO connections, don't attempt a window 874 * update while still in SYN_RECEIVED as this may trigger an early 875 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 876 * application response data, or failing that, when the DELACK timer 877 * expires. 878 */ 879 if ((tp->t_flags & TF_FASTOPEN) && 880 (tp->t_state == TCPS_SYN_RECEIVED)) 881 goto out; 882 #endif 883 #ifdef TCP_OFFLOAD 884 if (tp->t_flags & TF_TOE) 885 tcp_offload_rcvd(tp); 886 else 887 #endif 888 tp->t_fb->tfb_tcp_output(tp); 889 890 out: 891 TCPDEBUG2(PRU_RCVD); 892 TCP_PROBE2(debug__user, tp, PRU_RCVD); 893 INP_WUNLOCK(inp); 894 return (error); 895 } 896 897 /* 898 * Do a send by putting data in output queue and updating urgent 899 * marker if URG set. Possibly send more data. Unlike the other 900 * pru_*() routines, the mbuf chains are our responsibility. We 901 * must either enqueue them or free them. The other pru_* routines 902 * generally are caller-frees. 903 */ 904 static int 905 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 906 struct sockaddr *nam, struct mbuf *control, struct thread *td) 907 { 908 int error = 0; 909 struct inpcb *inp; 910 struct tcpcb *tp = NULL; 911 #ifdef INET6 912 int isipv6; 913 #endif 914 TCPDEBUG0; 915 916 /* 917 * We require the pcbinfo lock if we will close the socket as part of 918 * this call. 919 */ 920 if (flags & PRUS_EOF) 921 INP_INFO_RLOCK(&V_tcbinfo); 922 inp = sotoinpcb(so); 923 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 924 INP_WLOCK(inp); 925 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 926 if (control) 927 m_freem(control); 928 /* 929 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 930 * for freeing memory. 931 */ 932 if (m && (flags & PRUS_NOTREADY) == 0) 933 m_freem(m); 934 error = ECONNRESET; 935 goto out; 936 } 937 #ifdef INET6 938 isipv6 = nam && nam->sa_family == AF_INET6; 939 #endif /* INET6 */ 940 tp = intotcpcb(inp); 941 TCPDEBUG1(); 942 if (control) { 943 /* TCP doesn't do control messages (rights, creds, etc) */ 944 if (control->m_len) { 945 m_freem(control); 946 if (m) 947 m_freem(m); 948 error = EINVAL; 949 goto out; 950 } 951 m_freem(control); /* empty control, just free it */ 952 } 953 if (!(flags & PRUS_OOB)) { 954 sbappendstream(&so->so_snd, m, flags); 955 if (nam && tp->t_state < TCPS_SYN_SENT) { 956 /* 957 * Do implied connect if not yet connected, 958 * initialize window to default value, and 959 * initialize maxseg using peer's cached MSS. 960 */ 961 #ifdef INET6 962 if (isipv6) 963 error = tcp6_connect(tp, nam, td); 964 #endif /* INET6 */ 965 #if defined(INET6) && defined(INET) 966 else 967 #endif 968 #ifdef INET 969 error = tcp_connect(tp, nam, td); 970 #endif 971 if (error) 972 goto out; 973 tp->snd_wnd = TTCP_CLIENT_SND_WND; 974 tcp_mss(tp, -1); 975 } 976 if (flags & PRUS_EOF) { 977 /* 978 * Close the send side of the connection after 979 * the data is sent. 980 */ 981 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 982 socantsendmore(so); 983 tcp_usrclosed(tp); 984 } 985 if (!(inp->inp_flags & INP_DROPPED) && 986 !(flags & PRUS_NOTREADY)) { 987 if (flags & PRUS_MORETOCOME) 988 tp->t_flags |= TF_MORETOCOME; 989 error = tp->t_fb->tfb_tcp_output(tp); 990 if (flags & PRUS_MORETOCOME) 991 tp->t_flags &= ~TF_MORETOCOME; 992 } 993 } else { 994 /* 995 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 996 */ 997 SOCKBUF_LOCK(&so->so_snd); 998 if (sbspace(&so->so_snd) < -512) { 999 SOCKBUF_UNLOCK(&so->so_snd); 1000 m_freem(m); 1001 error = ENOBUFS; 1002 goto out; 1003 } 1004 /* 1005 * According to RFC961 (Assigned Protocols), 1006 * the urgent pointer points to the last octet 1007 * of urgent data. We continue, however, 1008 * to consider it to indicate the first octet 1009 * of data past the urgent section. 1010 * Otherwise, snd_up should be one lower. 1011 */ 1012 sbappendstream_locked(&so->so_snd, m, flags); 1013 SOCKBUF_UNLOCK(&so->so_snd); 1014 if (nam && tp->t_state < TCPS_SYN_SENT) { 1015 /* 1016 * Do implied connect if not yet connected, 1017 * initialize window to default value, and 1018 * initialize maxseg using peer's cached MSS. 1019 */ 1020 #ifdef INET6 1021 if (isipv6) 1022 error = tcp6_connect(tp, nam, td); 1023 #endif /* INET6 */ 1024 #if defined(INET6) && defined(INET) 1025 else 1026 #endif 1027 #ifdef INET 1028 error = tcp_connect(tp, nam, td); 1029 #endif 1030 if (error) 1031 goto out; 1032 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1033 tcp_mss(tp, -1); 1034 } 1035 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1036 if (!(flags & PRUS_NOTREADY)) { 1037 tp->t_flags |= TF_FORCEDATA; 1038 error = tp->t_fb->tfb_tcp_output(tp); 1039 tp->t_flags &= ~TF_FORCEDATA; 1040 } 1041 } 1042 out: 1043 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1044 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1045 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1046 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1047 INP_WUNLOCK(inp); 1048 if (flags & PRUS_EOF) 1049 INP_INFO_RUNLOCK(&V_tcbinfo); 1050 return (error); 1051 } 1052 1053 static int 1054 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1055 { 1056 struct inpcb *inp; 1057 struct tcpcb *tp; 1058 int error; 1059 1060 inp = sotoinpcb(so); 1061 INP_WLOCK(inp); 1062 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1063 INP_WUNLOCK(inp); 1064 for (int i = 0; i < count; i++) 1065 m = m_free(m); 1066 return (ECONNRESET); 1067 } 1068 tp = intotcpcb(inp); 1069 1070 SOCKBUF_LOCK(&so->so_snd); 1071 error = sbready(&so->so_snd, m, count); 1072 SOCKBUF_UNLOCK(&so->so_snd); 1073 if (error == 0) 1074 error = tp->t_fb->tfb_tcp_output(tp); 1075 INP_WUNLOCK(inp); 1076 1077 return (error); 1078 } 1079 1080 /* 1081 * Abort the TCP. Drop the connection abruptly. 1082 */ 1083 static void 1084 tcp_usr_abort(struct socket *so) 1085 { 1086 struct inpcb *inp; 1087 struct tcpcb *tp = NULL; 1088 TCPDEBUG0; 1089 1090 inp = sotoinpcb(so); 1091 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1092 1093 INP_INFO_RLOCK(&V_tcbinfo); 1094 INP_WLOCK(inp); 1095 KASSERT(inp->inp_socket != NULL, 1096 ("tcp_usr_abort: inp_socket == NULL")); 1097 1098 /* 1099 * If we still have full TCP state, and we're not dropped, drop. 1100 */ 1101 if (!(inp->inp_flags & INP_TIMEWAIT) && 1102 !(inp->inp_flags & INP_DROPPED)) { 1103 tp = intotcpcb(inp); 1104 TCPDEBUG1(); 1105 tp = tcp_drop(tp, ECONNABORTED); 1106 if (tp == NULL) 1107 goto dropped; 1108 TCPDEBUG2(PRU_ABORT); 1109 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1110 } 1111 if (!(inp->inp_flags & INP_DROPPED)) { 1112 SOCK_LOCK(so); 1113 so->so_state |= SS_PROTOREF; 1114 SOCK_UNLOCK(so); 1115 inp->inp_flags |= INP_SOCKREF; 1116 } 1117 INP_WUNLOCK(inp); 1118 dropped: 1119 INP_INFO_RUNLOCK(&V_tcbinfo); 1120 } 1121 1122 /* 1123 * TCP socket is closed. Start friendly disconnect. 1124 */ 1125 static void 1126 tcp_usr_close(struct socket *so) 1127 { 1128 struct inpcb *inp; 1129 struct tcpcb *tp = NULL; 1130 TCPDEBUG0; 1131 1132 inp = sotoinpcb(so); 1133 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1134 1135 INP_INFO_RLOCK(&V_tcbinfo); 1136 INP_WLOCK(inp); 1137 KASSERT(inp->inp_socket != NULL, 1138 ("tcp_usr_close: inp_socket == NULL")); 1139 1140 /* 1141 * If we still have full TCP state, and we're not dropped, initiate 1142 * a disconnect. 1143 */ 1144 if (!(inp->inp_flags & INP_TIMEWAIT) && 1145 !(inp->inp_flags & INP_DROPPED)) { 1146 tp = intotcpcb(inp); 1147 TCPDEBUG1(); 1148 tcp_disconnect(tp); 1149 TCPDEBUG2(PRU_CLOSE); 1150 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1151 } 1152 if (!(inp->inp_flags & INP_DROPPED)) { 1153 SOCK_LOCK(so); 1154 so->so_state |= SS_PROTOREF; 1155 SOCK_UNLOCK(so); 1156 inp->inp_flags |= INP_SOCKREF; 1157 } 1158 INP_WUNLOCK(inp); 1159 INP_INFO_RUNLOCK(&V_tcbinfo); 1160 } 1161 1162 /* 1163 * Receive out-of-band data. 1164 */ 1165 static int 1166 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1167 { 1168 int error = 0; 1169 struct inpcb *inp; 1170 struct tcpcb *tp = NULL; 1171 1172 TCPDEBUG0; 1173 inp = sotoinpcb(so); 1174 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1175 INP_WLOCK(inp); 1176 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1177 error = ECONNRESET; 1178 goto out; 1179 } 1180 tp = intotcpcb(inp); 1181 TCPDEBUG1(); 1182 if ((so->so_oobmark == 0 && 1183 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1184 so->so_options & SO_OOBINLINE || 1185 tp->t_oobflags & TCPOOB_HADDATA) { 1186 error = EINVAL; 1187 goto out; 1188 } 1189 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1190 error = EWOULDBLOCK; 1191 goto out; 1192 } 1193 m->m_len = 1; 1194 *mtod(m, caddr_t) = tp->t_iobc; 1195 if ((flags & MSG_PEEK) == 0) 1196 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1197 1198 out: 1199 TCPDEBUG2(PRU_RCVOOB); 1200 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1201 INP_WUNLOCK(inp); 1202 return (error); 1203 } 1204 1205 #ifdef INET 1206 struct pr_usrreqs tcp_usrreqs = { 1207 .pru_abort = tcp_usr_abort, 1208 .pru_accept = tcp_usr_accept, 1209 .pru_attach = tcp_usr_attach, 1210 .pru_bind = tcp_usr_bind, 1211 .pru_connect = tcp_usr_connect, 1212 .pru_control = in_control, 1213 .pru_detach = tcp_usr_detach, 1214 .pru_disconnect = tcp_usr_disconnect, 1215 .pru_listen = tcp_usr_listen, 1216 .pru_peeraddr = in_getpeeraddr, 1217 .pru_rcvd = tcp_usr_rcvd, 1218 .pru_rcvoob = tcp_usr_rcvoob, 1219 .pru_send = tcp_usr_send, 1220 .pru_ready = tcp_usr_ready, 1221 .pru_shutdown = tcp_usr_shutdown, 1222 .pru_sockaddr = in_getsockaddr, 1223 .pru_sosetlabel = in_pcbsosetlabel, 1224 .pru_close = tcp_usr_close, 1225 }; 1226 #endif /* INET */ 1227 1228 #ifdef INET6 1229 struct pr_usrreqs tcp6_usrreqs = { 1230 .pru_abort = tcp_usr_abort, 1231 .pru_accept = tcp6_usr_accept, 1232 .pru_attach = tcp_usr_attach, 1233 .pru_bind = tcp6_usr_bind, 1234 .pru_connect = tcp6_usr_connect, 1235 .pru_control = in6_control, 1236 .pru_detach = tcp_usr_detach, 1237 .pru_disconnect = tcp_usr_disconnect, 1238 .pru_listen = tcp6_usr_listen, 1239 .pru_peeraddr = in6_mapped_peeraddr, 1240 .pru_rcvd = tcp_usr_rcvd, 1241 .pru_rcvoob = tcp_usr_rcvoob, 1242 .pru_send = tcp_usr_send, 1243 .pru_ready = tcp_usr_ready, 1244 .pru_shutdown = tcp_usr_shutdown, 1245 .pru_sockaddr = in6_mapped_sockaddr, 1246 .pru_sosetlabel = in_pcbsosetlabel, 1247 .pru_close = tcp_usr_close, 1248 }; 1249 #endif /* INET6 */ 1250 1251 #ifdef INET 1252 /* 1253 * Common subroutine to open a TCP connection to remote host specified 1254 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1255 * port number if needed. Call in_pcbconnect_setup to do the routing and 1256 * to choose a local host address (interface). If there is an existing 1257 * incarnation of the same connection in TIME-WAIT state and if the remote 1258 * host was sending CC options and if the connection duration was < MSL, then 1259 * truncate the previous TIME-WAIT state and proceed. 1260 * Initialize connection parameters and enter SYN-SENT state. 1261 */ 1262 static int 1263 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1264 { 1265 struct inpcb *inp = tp->t_inpcb, *oinp; 1266 struct socket *so = inp->inp_socket; 1267 struct in_addr laddr; 1268 u_short lport; 1269 int error; 1270 1271 INP_WLOCK_ASSERT(inp); 1272 INP_HASH_WLOCK(&V_tcbinfo); 1273 1274 if (inp->inp_lport == 0) { 1275 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1276 if (error) 1277 goto out; 1278 } 1279 1280 /* 1281 * Cannot simply call in_pcbconnect, because there might be an 1282 * earlier incarnation of this same connection still in 1283 * TIME_WAIT state, creating an ADDRINUSE error. 1284 */ 1285 laddr = inp->inp_laddr; 1286 lport = inp->inp_lport; 1287 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1288 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1289 if (error && oinp == NULL) 1290 goto out; 1291 if (oinp) { 1292 error = EADDRINUSE; 1293 goto out; 1294 } 1295 inp->inp_laddr = laddr; 1296 in_pcbrehash(inp); 1297 INP_HASH_WUNLOCK(&V_tcbinfo); 1298 1299 /* 1300 * Compute window scaling to request: 1301 * Scale to fit into sweet spot. See tcp_syncache.c. 1302 * XXX: This should move to tcp_output(). 1303 */ 1304 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1305 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1306 tp->request_r_scale++; 1307 1308 soisconnecting(so); 1309 TCPSTAT_INC(tcps_connattempt); 1310 tcp_state_change(tp, TCPS_SYN_SENT); 1311 tp->iss = tcp_new_isn(tp); 1312 tcp_sendseqinit(tp); 1313 1314 return 0; 1315 1316 out: 1317 INP_HASH_WUNLOCK(&V_tcbinfo); 1318 return (error); 1319 } 1320 #endif /* INET */ 1321 1322 #ifdef INET6 1323 static int 1324 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1325 { 1326 struct inpcb *inp = tp->t_inpcb; 1327 int error; 1328 1329 INP_WLOCK_ASSERT(inp); 1330 INP_HASH_WLOCK(&V_tcbinfo); 1331 1332 if (inp->inp_lport == 0) { 1333 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1334 if (error) 1335 goto out; 1336 } 1337 error = in6_pcbconnect(inp, nam, td->td_ucred); 1338 if (error != 0) 1339 goto out; 1340 INP_HASH_WUNLOCK(&V_tcbinfo); 1341 1342 /* Compute window scaling to request. */ 1343 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1344 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1345 tp->request_r_scale++; 1346 1347 soisconnecting(inp->inp_socket); 1348 TCPSTAT_INC(tcps_connattempt); 1349 tcp_state_change(tp, TCPS_SYN_SENT); 1350 tp->iss = tcp_new_isn(tp); 1351 tcp_sendseqinit(tp); 1352 1353 return 0; 1354 1355 out: 1356 INP_HASH_WUNLOCK(&V_tcbinfo); 1357 return error; 1358 } 1359 #endif /* INET6 */ 1360 1361 /* 1362 * Export TCP internal state information via a struct tcp_info, based on the 1363 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1364 * (TCP state machine, etc). We export all information using FreeBSD-native 1365 * constants -- for example, the numeric values for tcpi_state will differ 1366 * from Linux. 1367 */ 1368 static void 1369 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1370 { 1371 1372 INP_WLOCK_ASSERT(tp->t_inpcb); 1373 bzero(ti, sizeof(*ti)); 1374 1375 ti->tcpi_state = tp->t_state; 1376 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1377 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1378 if (tp->t_flags & TF_SACK_PERMIT) 1379 ti->tcpi_options |= TCPI_OPT_SACK; 1380 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1381 ti->tcpi_options |= TCPI_OPT_WSCALE; 1382 ti->tcpi_snd_wscale = tp->snd_scale; 1383 ti->tcpi_rcv_wscale = tp->rcv_scale; 1384 } 1385 if (tp->t_flags & TF_ECN_PERMIT) 1386 ti->tcpi_options |= TCPI_OPT_ECN; 1387 1388 ti->tcpi_rto = tp->t_rxtcur * tick; 1389 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1390 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1391 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1392 1393 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1394 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1395 1396 /* 1397 * FreeBSD-specific extension fields for tcp_info. 1398 */ 1399 ti->tcpi_rcv_space = tp->rcv_wnd; 1400 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1401 ti->tcpi_snd_wnd = tp->snd_wnd; 1402 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1403 ti->tcpi_snd_nxt = tp->snd_nxt; 1404 ti->tcpi_snd_mss = tp->t_maxseg; 1405 ti->tcpi_rcv_mss = tp->t_maxseg; 1406 if (tp->t_flags & TF_TOE) 1407 ti->tcpi_options |= TCPI_OPT_TOE; 1408 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1409 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1410 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1411 } 1412 1413 /* 1414 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1415 * socket option arguments. When it re-acquires the lock after the copy, it 1416 * has to revalidate that the connection is still valid for the socket 1417 * option. 1418 */ 1419 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1420 INP_WLOCK(inp); \ 1421 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1422 INP_WUNLOCK(inp); \ 1423 cleanup; \ 1424 return (ECONNRESET); \ 1425 } \ 1426 tp = intotcpcb(inp); \ 1427 } while(0) 1428 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1429 1430 int 1431 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1432 { 1433 int error; 1434 struct inpcb *inp; 1435 struct tcpcb *tp; 1436 struct tcp_function_block *blk; 1437 struct tcp_function_set fsn; 1438 1439 error = 0; 1440 inp = sotoinpcb(so); 1441 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1442 INP_WLOCK(inp); 1443 if (sopt->sopt_level != IPPROTO_TCP) { 1444 #ifdef INET6 1445 if (inp->inp_vflag & INP_IPV6PROTO) { 1446 INP_WUNLOCK(inp); 1447 error = ip6_ctloutput(so, sopt); 1448 } 1449 #endif /* INET6 */ 1450 #if defined(INET6) && defined(INET) 1451 else 1452 #endif 1453 #ifdef INET 1454 { 1455 INP_WUNLOCK(inp); 1456 error = ip_ctloutput(so, sopt); 1457 } 1458 #endif 1459 return (error); 1460 } 1461 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1462 INP_WUNLOCK(inp); 1463 return (ECONNRESET); 1464 } 1465 tp = intotcpcb(inp); 1466 /* 1467 * Protect the TCP option TCP_FUNCTION_BLK so 1468 * that a sub-function can *never* overwrite this. 1469 */ 1470 if ((sopt->sopt_dir == SOPT_SET) && 1471 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1472 INP_WUNLOCK(inp); 1473 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1474 sizeof fsn); 1475 if (error) 1476 return (error); 1477 INP_WLOCK_RECHECK(inp); 1478 if (tp->t_state != TCPS_CLOSED) { 1479 /* 1480 * The user has advanced the state 1481 * past the initial point, we can't 1482 * switch since we are down the road 1483 * and a new set of functions may 1484 * not be compatibile. 1485 */ 1486 INP_WUNLOCK(inp); 1487 return(EINVAL); 1488 } 1489 blk = find_and_ref_tcp_functions(&fsn); 1490 if (blk == NULL) { 1491 INP_WUNLOCK(inp); 1492 return (ENOENT); 1493 } 1494 if (tp->t_fb != blk) { 1495 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1496 refcount_release(&blk->tfb_refcnt); 1497 INP_WUNLOCK(inp); 1498 return (ENOENT); 1499 } 1500 /* 1501 * Release the old refcnt, the 1502 * lookup acquires a ref on the 1503 * new one. 1504 */ 1505 if (tp->t_fb->tfb_tcp_fb_fini) 1506 (*tp->t_fb->tfb_tcp_fb_fini)(tp); 1507 refcount_release(&tp->t_fb->tfb_refcnt); 1508 tp->t_fb = blk; 1509 if (tp->t_fb->tfb_tcp_fb_init) { 1510 (*tp->t_fb->tfb_tcp_fb_init)(tp); 1511 } 1512 } 1513 #ifdef TCP_OFFLOAD 1514 if (tp->t_flags & TF_TOE) { 1515 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1516 sopt->sopt_name); 1517 } 1518 #endif 1519 INP_WUNLOCK(inp); 1520 return (error); 1521 } else if ((sopt->sopt_dir == SOPT_GET) && 1522 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1523 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1524 TCP_FUNCTION_NAME_LEN_MAX); 1525 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1526 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1527 INP_WUNLOCK(inp); 1528 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1529 return (error); 1530 } 1531 /* Pass in the INP locked, called must unlock it */ 1532 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1533 } 1534 1535 int 1536 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1537 { 1538 int error, opt, optval; 1539 u_int ui; 1540 struct tcp_info ti; 1541 struct cc_algo *algo; 1542 char *pbuf, buf[TCP_CA_NAME_MAX]; 1543 size_t len; 1544 1545 /* 1546 * For TCP_CCALGOOPT forward the control to CC module, for both 1547 * SOPT_SET and SOPT_GET. 1548 */ 1549 switch (sopt->sopt_name) { 1550 case TCP_CCALGOOPT: 1551 INP_WUNLOCK(inp); 1552 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1553 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1554 sopt->sopt_valsize); 1555 if (error) { 1556 free(pbuf, M_TEMP); 1557 return (error); 1558 } 1559 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1560 if (CC_ALGO(tp)->ctl_output != NULL) 1561 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1562 else 1563 error = ENOENT; 1564 INP_WUNLOCK(inp); 1565 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1566 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1567 free(pbuf, M_TEMP); 1568 return (error); 1569 } 1570 1571 switch (sopt->sopt_dir) { 1572 case SOPT_SET: 1573 switch (sopt->sopt_name) { 1574 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1575 case TCP_MD5SIG: 1576 if (!TCPMD5_ENABLED()) { 1577 INP_WUNLOCK(inp); 1578 return (ENOPROTOOPT); 1579 } 1580 error = TCPMD5_PCBCTL(inp, sopt); 1581 if (error) 1582 return (error); 1583 goto unlock_and_done; 1584 #endif /* IPSEC */ 1585 1586 case TCP_NODELAY: 1587 case TCP_NOOPT: 1588 INP_WUNLOCK(inp); 1589 error = sooptcopyin(sopt, &optval, sizeof optval, 1590 sizeof optval); 1591 if (error) 1592 return (error); 1593 1594 INP_WLOCK_RECHECK(inp); 1595 switch (sopt->sopt_name) { 1596 case TCP_NODELAY: 1597 opt = TF_NODELAY; 1598 break; 1599 case TCP_NOOPT: 1600 opt = TF_NOOPT; 1601 break; 1602 default: 1603 opt = 0; /* dead code to fool gcc */ 1604 break; 1605 } 1606 1607 if (optval) 1608 tp->t_flags |= opt; 1609 else 1610 tp->t_flags &= ~opt; 1611 unlock_and_done: 1612 #ifdef TCP_OFFLOAD 1613 if (tp->t_flags & TF_TOE) { 1614 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1615 sopt->sopt_name); 1616 } 1617 #endif 1618 INP_WUNLOCK(inp); 1619 break; 1620 1621 case TCP_NOPUSH: 1622 INP_WUNLOCK(inp); 1623 error = sooptcopyin(sopt, &optval, sizeof optval, 1624 sizeof optval); 1625 if (error) 1626 return (error); 1627 1628 INP_WLOCK_RECHECK(inp); 1629 if (optval) 1630 tp->t_flags |= TF_NOPUSH; 1631 else if (tp->t_flags & TF_NOPUSH) { 1632 tp->t_flags &= ~TF_NOPUSH; 1633 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1634 error = tp->t_fb->tfb_tcp_output(tp); 1635 } 1636 goto unlock_and_done; 1637 1638 case TCP_MAXSEG: 1639 INP_WUNLOCK(inp); 1640 error = sooptcopyin(sopt, &optval, sizeof optval, 1641 sizeof optval); 1642 if (error) 1643 return (error); 1644 1645 INP_WLOCK_RECHECK(inp); 1646 if (optval > 0 && optval <= tp->t_maxseg && 1647 optval + 40 >= V_tcp_minmss) 1648 tp->t_maxseg = optval; 1649 else 1650 error = EINVAL; 1651 goto unlock_and_done; 1652 1653 case TCP_INFO: 1654 INP_WUNLOCK(inp); 1655 error = EINVAL; 1656 break; 1657 1658 case TCP_CONGESTION: 1659 INP_WUNLOCK(inp); 1660 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1661 if (error) 1662 break; 1663 buf[sopt->sopt_valsize] = '\0'; 1664 INP_WLOCK_RECHECK(inp); 1665 CC_LIST_RLOCK(); 1666 STAILQ_FOREACH(algo, &cc_list, entries) 1667 if (strncmp(buf, algo->name, 1668 TCP_CA_NAME_MAX) == 0) 1669 break; 1670 CC_LIST_RUNLOCK(); 1671 if (algo == NULL) { 1672 INP_WUNLOCK(inp); 1673 error = EINVAL; 1674 break; 1675 } 1676 /* 1677 * We hold a write lock over the tcb so it's safe to 1678 * do these things without ordering concerns. 1679 */ 1680 if (CC_ALGO(tp)->cb_destroy != NULL) 1681 CC_ALGO(tp)->cb_destroy(tp->ccv); 1682 CC_ALGO(tp) = algo; 1683 /* 1684 * If something goes pear shaped initialising the new 1685 * algo, fall back to newreno (which does not 1686 * require initialisation). 1687 */ 1688 if (algo->cb_init != NULL && 1689 algo->cb_init(tp->ccv) != 0) { 1690 CC_ALGO(tp) = &newreno_cc_algo; 1691 /* 1692 * The only reason init should fail is 1693 * because of malloc. 1694 */ 1695 error = ENOMEM; 1696 } 1697 INP_WUNLOCK(inp); 1698 break; 1699 1700 case TCP_KEEPIDLE: 1701 case TCP_KEEPINTVL: 1702 case TCP_KEEPINIT: 1703 INP_WUNLOCK(inp); 1704 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1705 if (error) 1706 return (error); 1707 1708 if (ui > (UINT_MAX / hz)) { 1709 error = EINVAL; 1710 break; 1711 } 1712 ui *= hz; 1713 1714 INP_WLOCK_RECHECK(inp); 1715 switch (sopt->sopt_name) { 1716 case TCP_KEEPIDLE: 1717 tp->t_keepidle = ui; 1718 /* 1719 * XXX: better check current remaining 1720 * timeout and "merge" it with new value. 1721 */ 1722 if ((tp->t_state > TCPS_LISTEN) && 1723 (tp->t_state <= TCPS_CLOSING)) 1724 tcp_timer_activate(tp, TT_KEEP, 1725 TP_KEEPIDLE(tp)); 1726 break; 1727 case TCP_KEEPINTVL: 1728 tp->t_keepintvl = ui; 1729 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1730 (TP_MAXIDLE(tp) > 0)) 1731 tcp_timer_activate(tp, TT_2MSL, 1732 TP_MAXIDLE(tp)); 1733 break; 1734 case TCP_KEEPINIT: 1735 tp->t_keepinit = ui; 1736 if (tp->t_state == TCPS_SYN_RECEIVED || 1737 tp->t_state == TCPS_SYN_SENT) 1738 tcp_timer_activate(tp, TT_KEEP, 1739 TP_KEEPINIT(tp)); 1740 break; 1741 } 1742 goto unlock_and_done; 1743 1744 case TCP_KEEPCNT: 1745 INP_WUNLOCK(inp); 1746 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1747 if (error) 1748 return (error); 1749 1750 INP_WLOCK_RECHECK(inp); 1751 tp->t_keepcnt = ui; 1752 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1753 (TP_MAXIDLE(tp) > 0)) 1754 tcp_timer_activate(tp, TT_2MSL, 1755 TP_MAXIDLE(tp)); 1756 goto unlock_and_done; 1757 1758 #ifdef TCPPCAP 1759 case TCP_PCAP_OUT: 1760 case TCP_PCAP_IN: 1761 INP_WUNLOCK(inp); 1762 error = sooptcopyin(sopt, &optval, sizeof optval, 1763 sizeof optval); 1764 if (error) 1765 return (error); 1766 1767 INP_WLOCK_RECHECK(inp); 1768 if (optval >= 0) 1769 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 1770 &(tp->t_outpkts) : &(tp->t_inpkts), 1771 optval); 1772 else 1773 error = EINVAL; 1774 goto unlock_and_done; 1775 #endif 1776 1777 #ifdef TCP_RFC7413 1778 case TCP_FASTOPEN: 1779 INP_WUNLOCK(inp); 1780 if (!V_tcp_fastopen_enabled) 1781 return (EPERM); 1782 1783 error = sooptcopyin(sopt, &optval, sizeof optval, 1784 sizeof optval); 1785 if (error) 1786 return (error); 1787 1788 INP_WLOCK_RECHECK(inp); 1789 if (optval) { 1790 tp->t_flags |= TF_FASTOPEN; 1791 if ((tp->t_state == TCPS_LISTEN) && 1792 (tp->t_tfo_pending == NULL)) 1793 tp->t_tfo_pending = 1794 tcp_fastopen_alloc_counter(); 1795 } else 1796 tp->t_flags &= ~TF_FASTOPEN; 1797 goto unlock_and_done; 1798 #endif 1799 1800 default: 1801 INP_WUNLOCK(inp); 1802 error = ENOPROTOOPT; 1803 break; 1804 } 1805 break; 1806 1807 case SOPT_GET: 1808 tp = intotcpcb(inp); 1809 switch (sopt->sopt_name) { 1810 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1811 case TCP_MD5SIG: 1812 if (!TCPMD5_ENABLED()) { 1813 INP_WUNLOCK(inp); 1814 return (ENOPROTOOPT); 1815 } 1816 error = TCPMD5_PCBCTL(inp, sopt); 1817 break; 1818 #endif 1819 1820 case TCP_NODELAY: 1821 optval = tp->t_flags & TF_NODELAY; 1822 INP_WUNLOCK(inp); 1823 error = sooptcopyout(sopt, &optval, sizeof optval); 1824 break; 1825 case TCP_MAXSEG: 1826 optval = tp->t_maxseg; 1827 INP_WUNLOCK(inp); 1828 error = sooptcopyout(sopt, &optval, sizeof optval); 1829 break; 1830 case TCP_NOOPT: 1831 optval = tp->t_flags & TF_NOOPT; 1832 INP_WUNLOCK(inp); 1833 error = sooptcopyout(sopt, &optval, sizeof optval); 1834 break; 1835 case TCP_NOPUSH: 1836 optval = tp->t_flags & TF_NOPUSH; 1837 INP_WUNLOCK(inp); 1838 error = sooptcopyout(sopt, &optval, sizeof optval); 1839 break; 1840 case TCP_INFO: 1841 tcp_fill_info(tp, &ti); 1842 INP_WUNLOCK(inp); 1843 error = sooptcopyout(sopt, &ti, sizeof ti); 1844 break; 1845 case TCP_CONGESTION: 1846 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 1847 INP_WUNLOCK(inp); 1848 error = sooptcopyout(sopt, buf, len + 1); 1849 break; 1850 case TCP_KEEPIDLE: 1851 case TCP_KEEPINTVL: 1852 case TCP_KEEPINIT: 1853 case TCP_KEEPCNT: 1854 switch (sopt->sopt_name) { 1855 case TCP_KEEPIDLE: 1856 ui = TP_KEEPIDLE(tp) / hz; 1857 break; 1858 case TCP_KEEPINTVL: 1859 ui = TP_KEEPINTVL(tp) / hz; 1860 break; 1861 case TCP_KEEPINIT: 1862 ui = TP_KEEPINIT(tp) / hz; 1863 break; 1864 case TCP_KEEPCNT: 1865 ui = TP_KEEPCNT(tp); 1866 break; 1867 } 1868 INP_WUNLOCK(inp); 1869 error = sooptcopyout(sopt, &ui, sizeof(ui)); 1870 break; 1871 #ifdef TCPPCAP 1872 case TCP_PCAP_OUT: 1873 case TCP_PCAP_IN: 1874 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 1875 &(tp->t_outpkts) : &(tp->t_inpkts)); 1876 INP_WUNLOCK(inp); 1877 error = sooptcopyout(sopt, &optval, sizeof optval); 1878 break; 1879 #endif 1880 1881 #ifdef TCP_RFC7413 1882 case TCP_FASTOPEN: 1883 optval = tp->t_flags & TF_FASTOPEN; 1884 INP_WUNLOCK(inp); 1885 error = sooptcopyout(sopt, &optval, sizeof optval); 1886 break; 1887 #endif 1888 default: 1889 INP_WUNLOCK(inp); 1890 error = ENOPROTOOPT; 1891 break; 1892 } 1893 break; 1894 } 1895 return (error); 1896 } 1897 #undef INP_WLOCK_RECHECK 1898 #undef INP_WLOCK_RECHECK_CLEANUP 1899 1900 /* 1901 * Attach TCP protocol to socket, allocating 1902 * internet protocol control block, tcp control block, 1903 * bufer space, and entering LISTEN state if to accept connections. 1904 */ 1905 static int 1906 tcp_attach(struct socket *so) 1907 { 1908 struct tcpcb *tp; 1909 struct inpcb *inp; 1910 int error; 1911 1912 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1913 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1914 if (error) 1915 return (error); 1916 } 1917 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1918 so->so_snd.sb_flags |= SB_AUTOSIZE; 1919 INP_INFO_RLOCK(&V_tcbinfo); 1920 error = in_pcballoc(so, &V_tcbinfo); 1921 if (error) { 1922 INP_INFO_RUNLOCK(&V_tcbinfo); 1923 return (error); 1924 } 1925 inp = sotoinpcb(so); 1926 #ifdef INET6 1927 if (inp->inp_vflag & INP_IPV6PROTO) { 1928 inp->inp_vflag |= INP_IPV6; 1929 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 1930 inp->inp_vflag |= INP_IPV4; 1931 inp->in6p_hops = -1; /* use kernel default */ 1932 } 1933 else 1934 #endif 1935 inp->inp_vflag |= INP_IPV4; 1936 tp = tcp_newtcpcb(inp); 1937 if (tp == NULL) { 1938 in_pcbdetach(inp); 1939 in_pcbfree(inp); 1940 INP_INFO_RUNLOCK(&V_tcbinfo); 1941 return (ENOBUFS); 1942 } 1943 tp->t_state = TCPS_CLOSED; 1944 INP_WUNLOCK(inp); 1945 INP_INFO_RUNLOCK(&V_tcbinfo); 1946 TCPSTATES_INC(TCPS_CLOSED); 1947 return (0); 1948 } 1949 1950 /* 1951 * Initiate (or continue) disconnect. 1952 * If embryonic state, just send reset (once). 1953 * If in ``let data drain'' option and linger null, just drop. 1954 * Otherwise (hard), mark socket disconnecting and drop 1955 * current input data; switch states based on user close, and 1956 * send segment to peer (with FIN). 1957 */ 1958 static void 1959 tcp_disconnect(struct tcpcb *tp) 1960 { 1961 struct inpcb *inp = tp->t_inpcb; 1962 struct socket *so = inp->inp_socket; 1963 1964 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1965 INP_WLOCK_ASSERT(inp); 1966 1967 /* 1968 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1969 * socket is still open. 1970 */ 1971 if (tp->t_state < TCPS_ESTABLISHED) { 1972 tp = tcp_close(tp); 1973 KASSERT(tp != NULL, 1974 ("tcp_disconnect: tcp_close() returned NULL")); 1975 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1976 tp = tcp_drop(tp, 0); 1977 KASSERT(tp != NULL, 1978 ("tcp_disconnect: tcp_drop() returned NULL")); 1979 } else { 1980 soisdisconnecting(so); 1981 sbflush(&so->so_rcv); 1982 tcp_usrclosed(tp); 1983 if (!(inp->inp_flags & INP_DROPPED)) 1984 tp->t_fb->tfb_tcp_output(tp); 1985 } 1986 } 1987 1988 /* 1989 * User issued close, and wish to trail through shutdown states: 1990 * if never received SYN, just forget it. If got a SYN from peer, 1991 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1992 * If already got a FIN from peer, then almost done; go to LAST_ACK 1993 * state. In all other cases, have already sent FIN to peer (e.g. 1994 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1995 * for peer to send FIN or not respond to keep-alives, etc. 1996 * We can let the user exit from the close as soon as the FIN is acked. 1997 */ 1998 static void 1999 tcp_usrclosed(struct tcpcb *tp) 2000 { 2001 2002 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 2003 INP_WLOCK_ASSERT(tp->t_inpcb); 2004 2005 switch (tp->t_state) { 2006 case TCPS_LISTEN: 2007 #ifdef TCP_OFFLOAD 2008 tcp_offload_listen_stop(tp); 2009 #endif 2010 tcp_state_change(tp, TCPS_CLOSED); 2011 /* FALLTHROUGH */ 2012 case TCPS_CLOSED: 2013 tp = tcp_close(tp); 2014 /* 2015 * tcp_close() should never return NULL here as the socket is 2016 * still open. 2017 */ 2018 KASSERT(tp != NULL, 2019 ("tcp_usrclosed: tcp_close() returned NULL")); 2020 break; 2021 2022 case TCPS_SYN_SENT: 2023 case TCPS_SYN_RECEIVED: 2024 tp->t_flags |= TF_NEEDFIN; 2025 break; 2026 2027 case TCPS_ESTABLISHED: 2028 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2029 break; 2030 2031 case TCPS_CLOSE_WAIT: 2032 tcp_state_change(tp, TCPS_LAST_ACK); 2033 break; 2034 } 2035 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2036 soisdisconnected(tp->t_inpcb->inp_socket); 2037 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2038 if (tp->t_state == TCPS_FIN_WAIT_2) { 2039 int timeout; 2040 2041 timeout = (tcp_fast_finwait2_recycle) ? 2042 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2043 tcp_timer_activate(tp, TT_2MSL, timeout); 2044 } 2045 } 2046 } 2047 2048 #ifdef DDB 2049 static void 2050 db_print_indent(int indent) 2051 { 2052 int i; 2053 2054 for (i = 0; i < indent; i++) 2055 db_printf(" "); 2056 } 2057 2058 static void 2059 db_print_tstate(int t_state) 2060 { 2061 2062 switch (t_state) { 2063 case TCPS_CLOSED: 2064 db_printf("TCPS_CLOSED"); 2065 return; 2066 2067 case TCPS_LISTEN: 2068 db_printf("TCPS_LISTEN"); 2069 return; 2070 2071 case TCPS_SYN_SENT: 2072 db_printf("TCPS_SYN_SENT"); 2073 return; 2074 2075 case TCPS_SYN_RECEIVED: 2076 db_printf("TCPS_SYN_RECEIVED"); 2077 return; 2078 2079 case TCPS_ESTABLISHED: 2080 db_printf("TCPS_ESTABLISHED"); 2081 return; 2082 2083 case TCPS_CLOSE_WAIT: 2084 db_printf("TCPS_CLOSE_WAIT"); 2085 return; 2086 2087 case TCPS_FIN_WAIT_1: 2088 db_printf("TCPS_FIN_WAIT_1"); 2089 return; 2090 2091 case TCPS_CLOSING: 2092 db_printf("TCPS_CLOSING"); 2093 return; 2094 2095 case TCPS_LAST_ACK: 2096 db_printf("TCPS_LAST_ACK"); 2097 return; 2098 2099 case TCPS_FIN_WAIT_2: 2100 db_printf("TCPS_FIN_WAIT_2"); 2101 return; 2102 2103 case TCPS_TIME_WAIT: 2104 db_printf("TCPS_TIME_WAIT"); 2105 return; 2106 2107 default: 2108 db_printf("unknown"); 2109 return; 2110 } 2111 } 2112 2113 static void 2114 db_print_tflags(u_int t_flags) 2115 { 2116 int comma; 2117 2118 comma = 0; 2119 if (t_flags & TF_ACKNOW) { 2120 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2121 comma = 1; 2122 } 2123 if (t_flags & TF_DELACK) { 2124 db_printf("%sTF_DELACK", comma ? ", " : ""); 2125 comma = 1; 2126 } 2127 if (t_flags & TF_NODELAY) { 2128 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2129 comma = 1; 2130 } 2131 if (t_flags & TF_NOOPT) { 2132 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2133 comma = 1; 2134 } 2135 if (t_flags & TF_SENTFIN) { 2136 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2137 comma = 1; 2138 } 2139 if (t_flags & TF_REQ_SCALE) { 2140 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2141 comma = 1; 2142 } 2143 if (t_flags & TF_RCVD_SCALE) { 2144 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2145 comma = 1; 2146 } 2147 if (t_flags & TF_REQ_TSTMP) { 2148 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2149 comma = 1; 2150 } 2151 if (t_flags & TF_RCVD_TSTMP) { 2152 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2153 comma = 1; 2154 } 2155 if (t_flags & TF_SACK_PERMIT) { 2156 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2157 comma = 1; 2158 } 2159 if (t_flags & TF_NEEDSYN) { 2160 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2161 comma = 1; 2162 } 2163 if (t_flags & TF_NEEDFIN) { 2164 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2165 comma = 1; 2166 } 2167 if (t_flags & TF_NOPUSH) { 2168 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2169 comma = 1; 2170 } 2171 if (t_flags & TF_MORETOCOME) { 2172 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2173 comma = 1; 2174 } 2175 if (t_flags & TF_LQ_OVERFLOW) { 2176 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2177 comma = 1; 2178 } 2179 if (t_flags & TF_LASTIDLE) { 2180 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2181 comma = 1; 2182 } 2183 if (t_flags & TF_RXWIN0SENT) { 2184 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2185 comma = 1; 2186 } 2187 if (t_flags & TF_FASTRECOVERY) { 2188 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2189 comma = 1; 2190 } 2191 if (t_flags & TF_CONGRECOVERY) { 2192 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2193 comma = 1; 2194 } 2195 if (t_flags & TF_WASFRECOVERY) { 2196 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2197 comma = 1; 2198 } 2199 if (t_flags & TF_SIGNATURE) { 2200 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2201 comma = 1; 2202 } 2203 if (t_flags & TF_FORCEDATA) { 2204 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2205 comma = 1; 2206 } 2207 if (t_flags & TF_TSO) { 2208 db_printf("%sTF_TSO", comma ? ", " : ""); 2209 comma = 1; 2210 } 2211 if (t_flags & TF_ECN_PERMIT) { 2212 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2213 comma = 1; 2214 } 2215 if (t_flags & TF_FASTOPEN) { 2216 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2217 comma = 1; 2218 } 2219 } 2220 2221 static void 2222 db_print_toobflags(char t_oobflags) 2223 { 2224 int comma; 2225 2226 comma = 0; 2227 if (t_oobflags & TCPOOB_HAVEDATA) { 2228 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2229 comma = 1; 2230 } 2231 if (t_oobflags & TCPOOB_HADDATA) { 2232 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2233 comma = 1; 2234 } 2235 } 2236 2237 static void 2238 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2239 { 2240 2241 db_print_indent(indent); 2242 db_printf("%s at %p\n", name, tp); 2243 2244 indent += 2; 2245 2246 db_print_indent(indent); 2247 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2248 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2249 2250 db_print_indent(indent); 2251 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2252 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2253 2254 db_print_indent(indent); 2255 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2256 &tp->t_timers->tt_delack, tp->t_inpcb); 2257 2258 db_print_indent(indent); 2259 db_printf("t_state: %d (", tp->t_state); 2260 db_print_tstate(tp->t_state); 2261 db_printf(")\n"); 2262 2263 db_print_indent(indent); 2264 db_printf("t_flags: 0x%x (", tp->t_flags); 2265 db_print_tflags(tp->t_flags); 2266 db_printf(")\n"); 2267 2268 db_print_indent(indent); 2269 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2270 tp->snd_una, tp->snd_max, tp->snd_nxt); 2271 2272 db_print_indent(indent); 2273 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2274 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2275 2276 db_print_indent(indent); 2277 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2278 tp->iss, tp->irs, tp->rcv_nxt); 2279 2280 db_print_indent(indent); 2281 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2282 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2283 2284 db_print_indent(indent); 2285 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2286 tp->snd_wnd, tp->snd_cwnd); 2287 2288 db_print_indent(indent); 2289 db_printf("snd_ssthresh: %lu snd_recover: " 2290 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2291 2292 db_print_indent(indent); 2293 db_printf("t_rcvtime: %u t_startime: %u\n", 2294 tp->t_rcvtime, tp->t_starttime); 2295 2296 db_print_indent(indent); 2297 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2298 tp->t_rtttime, tp->t_rtseq); 2299 2300 db_print_indent(indent); 2301 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2302 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2303 2304 db_print_indent(indent); 2305 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2306 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2307 tp->t_rttbest); 2308 2309 db_print_indent(indent); 2310 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2311 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2312 2313 db_print_indent(indent); 2314 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2315 db_print_toobflags(tp->t_oobflags); 2316 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2317 2318 db_print_indent(indent); 2319 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2320 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2321 2322 db_print_indent(indent); 2323 db_printf("ts_recent: %u ts_recent_age: %u\n", 2324 tp->ts_recent, tp->ts_recent_age); 2325 2326 db_print_indent(indent); 2327 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2328 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2329 2330 db_print_indent(indent); 2331 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2332 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2333 tp->snd_recover_prev, tp->t_badrxtwin); 2334 2335 db_print_indent(indent); 2336 db_printf("snd_numholes: %d snd_holes first: %p\n", 2337 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2338 2339 db_print_indent(indent); 2340 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2341 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2342 2343 /* Skip sackblks, sackhint. */ 2344 2345 db_print_indent(indent); 2346 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2347 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2348 } 2349 2350 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2351 { 2352 struct tcpcb *tp; 2353 2354 if (!have_addr) { 2355 db_printf("usage: show tcpcb <addr>\n"); 2356 return; 2357 } 2358 tp = (struct tcpcb *)addr; 2359 2360 db_print_tcpcb(tp, "tcpcb", 0); 2361 } 2362 #endif
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