1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 6 * Copyright (c) 2006-2007 Robert N. M. Watson 7 * Copyright (c) 2010-2011 Juniper Networks, Inc. 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Robert N. M. Watson under 11 * contract to Juniper Networks, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 38 */ 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 #include "opt_ddb.h" 44 #include "opt_inet.h" 45 #include "opt_inet6.h" 46 #include "opt_ipsec.h" 47 #include "opt_kern_tls.h" 48 #include "opt_tcpdebug.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/arb.h> 53 #include <sys/limits.h> 54 #include <sys/malloc.h> 55 #include <sys/refcount.h> 56 #include <sys/kernel.h> 57 #include <sys/ktls.h> 58 #include <sys/qmath.h> 59 #include <sys/sysctl.h> 60 #include <sys/mbuf.h> 61 #ifdef INET6 62 #include <sys/domain.h> 63 #endif /* INET6 */ 64 #include <sys/socket.h> 65 #include <sys/socketvar.h> 66 #include <sys/protosw.h> 67 #include <sys/proc.h> 68 #include <sys/jail.h> 69 #include <sys/syslog.h> 70 #include <sys/stats.h> 71 72 #ifdef DDB 73 #include <ddb/ddb.h> 74 #endif 75 76 #include <net/if.h> 77 #include <net/if_var.h> 78 #include <net/route.h> 79 #include <net/vnet.h> 80 81 #include <netinet/in.h> 82 #include <netinet/in_kdtrace.h> 83 #include <netinet/in_pcb.h> 84 #include <netinet/in_systm.h> 85 #include <netinet/in_var.h> 86 #include <netinet/ip_var.h> 87 #ifdef INET6 88 #include <netinet/ip6.h> 89 #include <netinet6/in6_pcb.h> 90 #include <netinet6/ip6_var.h> 91 #include <netinet6/scope6_var.h> 92 #endif 93 #include <netinet/tcp.h> 94 #include <netinet/tcp_fsm.h> 95 #include <netinet/tcp_seq.h> 96 #include <netinet/tcp_timer.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet/tcp_log_buf.h> 99 #include <netinet/tcpip.h> 100 #include <netinet/cc/cc.h> 101 #include <netinet/tcp_fastopen.h> 102 #include <netinet/tcp_hpts.h> 103 #ifdef TCPPCAP 104 #include <netinet/tcp_pcap.h> 105 #endif 106 #ifdef TCPDEBUG 107 #include <netinet/tcp_debug.h> 108 #endif 109 #ifdef TCP_OFFLOAD 110 #include <netinet/tcp_offload.h> 111 #endif 112 #include <netipsec/ipsec_support.h> 113 114 #include <vm/vm.h> 115 #include <vm/vm_param.h> 116 #include <vm/pmap.h> 117 #include <vm/vm_extern.h> 118 #include <vm/vm_map.h> 119 #include <vm/vm_page.h> 120 121 /* 122 * TCP protocol interface to socket abstraction. 123 */ 124 #ifdef INET 125 static int tcp_connect(struct tcpcb *, struct sockaddr *, 126 struct thread *td); 127 #endif /* INET */ 128 #ifdef INET6 129 static int tcp6_connect(struct tcpcb *, struct sockaddr *, 130 struct thread *td); 131 #endif /* INET6 */ 132 static void tcp_disconnect(struct tcpcb *); 133 static void tcp_usrclosed(struct tcpcb *); 134 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 135 136 static int tcp_pru_options_support(struct tcpcb *tp, int flags); 137 138 #ifdef TCPDEBUG 139 #define TCPDEBUG0 int ostate = 0 140 #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 141 #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 142 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 143 #else 144 #define TCPDEBUG0 145 #define TCPDEBUG1() 146 #define TCPDEBUG2(req) 147 #endif 148 149 /* 150 * tcp_require_unique port requires a globally-unique source port for each 151 * outgoing connection. The default is to require the 4-tuple to be unique. 152 */ 153 VNET_DEFINE(int, tcp_require_unique_port) = 0; 154 SYSCTL_INT(_net_inet_tcp, OID_AUTO, require_unique_port, 155 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_require_unique_port), 0, 156 "Require globally-unique ephemeral port for outgoing connections"); 157 #define V_tcp_require_unique_port VNET(tcp_require_unique_port) 158 159 /* 160 * TCP attaches to socket via pru_attach(), reserving space, 161 * and an internet control block. 162 */ 163 static int 164 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 165 { 166 struct inpcb *inp; 167 struct tcpcb *tp = NULL; 168 int error; 169 TCPDEBUG0; 170 171 inp = sotoinpcb(so); 172 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 173 TCPDEBUG1(); 174 175 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 176 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 177 if (error) 178 goto out; 179 } 180 181 so->so_rcv.sb_flags |= SB_AUTOSIZE; 182 so->so_snd.sb_flags |= SB_AUTOSIZE; 183 error = in_pcballoc(so, &V_tcbinfo); 184 if (error) 185 goto out; 186 inp = sotoinpcb(so); 187 #ifdef INET6 188 if (inp->inp_vflag & INP_IPV6PROTO) { 189 inp->inp_vflag |= INP_IPV6; 190 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 191 inp->inp_vflag |= INP_IPV4; 192 inp->in6p_hops = -1; /* use kernel default */ 193 } 194 else 195 #endif 196 inp->inp_vflag |= INP_IPV4; 197 tp = tcp_newtcpcb(inp); 198 if (tp == NULL) { 199 error = ENOBUFS; 200 in_pcbdetach(inp); 201 in_pcbfree(inp); 202 goto out; 203 } 204 tp->t_state = TCPS_CLOSED; 205 INP_WUNLOCK(inp); 206 TCPSTATES_INC(TCPS_CLOSED); 207 out: 208 TCPDEBUG2(PRU_ATTACH); 209 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 210 return (error); 211 } 212 213 /* 214 * tcp_usr_detach is called when the socket layer loses its final reference 215 * to the socket, be it a file descriptor reference, a reference from TCP, 216 * etc. At this point, there is only one case in which we will keep around 217 * inpcb state: time wait. 218 */ 219 static void 220 tcp_usr_detach(struct socket *so) 221 { 222 struct inpcb *inp; 223 struct tcpcb *tp; 224 225 inp = sotoinpcb(so); 226 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 227 INP_WLOCK(inp); 228 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 229 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 230 231 tp = intotcpcb(inp); 232 233 if (inp->inp_flags & INP_TIMEWAIT) { 234 /* 235 * There are two cases to handle: one in which the time wait 236 * state is being discarded (INP_DROPPED), and one in which 237 * this connection will remain in timewait. In the former, 238 * it is time to discard all state (except tcptw, which has 239 * already been discarded by the timewait close code, which 240 * should be further up the call stack somewhere). In the 241 * latter case, we detach from the socket, but leave the pcb 242 * present until timewait ends. 243 * 244 * XXXRW: Would it be cleaner to free the tcptw here? 245 * 246 * Astute question indeed, from twtcp perspective there are 247 * four cases to consider: 248 * 249 * #1 tcp_usr_detach is called at tcptw creation time by 250 * tcp_twstart, then do not discard the newly created tcptw 251 * and leave inpcb present until timewait ends 252 * #2 tcp_usr_detach is called at tcptw creation time by 253 * tcp_twstart, but connection is local and tw will be 254 * discarded immediately 255 * #3 tcp_usr_detach is called at timewait end (or reuse) by 256 * tcp_twclose, then the tcptw has already been discarded 257 * (or reused) and inpcb is freed here 258 * #4 tcp_usr_detach is called() after timewait ends (or reuse) 259 * (e.g. by soclose), then tcptw has already been discarded 260 * (or reused) and inpcb is freed here 261 * 262 * In all three cases the tcptw should not be freed here. 263 */ 264 if (inp->inp_flags & INP_DROPPED) { 265 in_pcbdetach(inp); 266 if (__predict_true(tp == NULL)) { 267 in_pcbfree(inp); 268 } else { 269 /* 270 * This case should not happen as in TIMEWAIT 271 * state the inp should not be destroyed before 272 * its tcptw. If INVARIANTS is defined, panic. 273 */ 274 #ifdef INVARIANTS 275 panic("%s: Panic before an inp double-free: " 276 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 277 , __func__); 278 #else 279 log(LOG_ERR, "%s: Avoid an inp double-free: " 280 "INP_TIMEWAIT && INP_DROPPED && tp != NULL" 281 , __func__); 282 #endif 283 INP_WUNLOCK(inp); 284 } 285 } else { 286 in_pcbdetach(inp); 287 INP_WUNLOCK(inp); 288 } 289 } else { 290 /* 291 * If the connection is not in timewait, we consider two 292 * two conditions: one in which no further processing is 293 * necessary (dropped || embryonic), and one in which TCP is 294 * not yet done, but no longer requires the socket, so the 295 * pcb will persist for the time being. 296 * 297 * XXXRW: Does the second case still occur? 298 */ 299 if (inp->inp_flags & INP_DROPPED || 300 tp->t_state < TCPS_SYN_SENT) { 301 tcp_discardcb(tp); 302 in_pcbdetach(inp); 303 in_pcbfree(inp); 304 } else { 305 in_pcbdetach(inp); 306 INP_WUNLOCK(inp); 307 } 308 } 309 } 310 311 #ifdef INET 312 /* 313 * Give the socket an address. 314 */ 315 static int 316 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 317 { 318 int error = 0; 319 struct inpcb *inp; 320 struct tcpcb *tp = NULL; 321 struct sockaddr_in *sinp; 322 323 sinp = (struct sockaddr_in *)nam; 324 if (nam->sa_len != sizeof (*sinp)) 325 return (EINVAL); 326 /* 327 * Must check for multicast addresses and disallow binding 328 * to them. 329 */ 330 if (sinp->sin_family == AF_INET && 331 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 332 return (EAFNOSUPPORT); 333 334 TCPDEBUG0; 335 inp = sotoinpcb(so); 336 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 337 INP_WLOCK(inp); 338 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 339 error = EINVAL; 340 goto out; 341 } 342 tp = intotcpcb(inp); 343 TCPDEBUG1(); 344 INP_HASH_WLOCK(&V_tcbinfo); 345 error = in_pcbbind(inp, nam, td->td_ucred); 346 INP_HASH_WUNLOCK(&V_tcbinfo); 347 out: 348 TCPDEBUG2(PRU_BIND); 349 TCP_PROBE2(debug__user, tp, PRU_BIND); 350 INP_WUNLOCK(inp); 351 352 return (error); 353 } 354 #endif /* INET */ 355 356 #ifdef INET6 357 static int 358 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 359 { 360 int error = 0; 361 struct inpcb *inp; 362 struct tcpcb *tp = NULL; 363 struct sockaddr_in6 *sin6; 364 u_char vflagsav; 365 366 sin6 = (struct sockaddr_in6 *)nam; 367 if (nam->sa_len != sizeof (*sin6)) 368 return (EINVAL); 369 /* 370 * Must check for multicast addresses and disallow binding 371 * to them. 372 */ 373 if (sin6->sin6_family == AF_INET6 && 374 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 375 return (EAFNOSUPPORT); 376 377 TCPDEBUG0; 378 inp = sotoinpcb(so); 379 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 380 INP_WLOCK(inp); 381 vflagsav = inp->inp_vflag; 382 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 383 error = EINVAL; 384 goto out; 385 } 386 tp = intotcpcb(inp); 387 TCPDEBUG1(); 388 INP_HASH_WLOCK(&V_tcbinfo); 389 inp->inp_vflag &= ~INP_IPV4; 390 inp->inp_vflag |= INP_IPV6; 391 #ifdef INET 392 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 393 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 394 inp->inp_vflag |= INP_IPV4; 395 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 396 struct sockaddr_in sin; 397 398 in6_sin6_2_sin(&sin, sin6); 399 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 400 error = EAFNOSUPPORT; 401 INP_HASH_WUNLOCK(&V_tcbinfo); 402 goto out; 403 } 404 inp->inp_vflag |= INP_IPV4; 405 inp->inp_vflag &= ~INP_IPV6; 406 error = in_pcbbind(inp, (struct sockaddr *)&sin, 407 td->td_ucred); 408 INP_HASH_WUNLOCK(&V_tcbinfo); 409 goto out; 410 } 411 } 412 #endif 413 error = in6_pcbbind(inp, nam, td->td_ucred); 414 INP_HASH_WUNLOCK(&V_tcbinfo); 415 out: 416 if (error != 0) 417 inp->inp_vflag = vflagsav; 418 TCPDEBUG2(PRU_BIND); 419 TCP_PROBE2(debug__user, tp, PRU_BIND); 420 INP_WUNLOCK(inp); 421 return (error); 422 } 423 #endif /* INET6 */ 424 425 #ifdef INET 426 /* 427 * Prepare to accept connections. 428 */ 429 static int 430 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 431 { 432 int error = 0; 433 struct inpcb *inp; 434 struct tcpcb *tp = NULL; 435 436 TCPDEBUG0; 437 inp = sotoinpcb(so); 438 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 439 INP_WLOCK(inp); 440 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 441 error = EINVAL; 442 goto out; 443 } 444 tp = intotcpcb(inp); 445 TCPDEBUG1(); 446 SOCK_LOCK(so); 447 error = solisten_proto_check(so); 448 INP_HASH_WLOCK(&V_tcbinfo); 449 if (error == 0 && inp->inp_lport == 0) 450 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 451 INP_HASH_WUNLOCK(&V_tcbinfo); 452 if (error == 0) { 453 tcp_state_change(tp, TCPS_LISTEN); 454 solisten_proto(so, backlog); 455 #ifdef TCP_OFFLOAD 456 if ((so->so_options & SO_NO_OFFLOAD) == 0) 457 tcp_offload_listen_start(tp); 458 #endif 459 } 460 SOCK_UNLOCK(so); 461 462 if (IS_FASTOPEN(tp->t_flags)) 463 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 464 465 out: 466 TCPDEBUG2(PRU_LISTEN); 467 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 468 INP_WUNLOCK(inp); 469 return (error); 470 } 471 #endif /* INET */ 472 473 #ifdef INET6 474 static int 475 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 476 { 477 int error = 0; 478 struct inpcb *inp; 479 struct tcpcb *tp = NULL; 480 u_char vflagsav; 481 482 TCPDEBUG0; 483 inp = sotoinpcb(so); 484 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 485 INP_WLOCK(inp); 486 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 487 error = EINVAL; 488 goto out; 489 } 490 vflagsav = inp->inp_vflag; 491 tp = intotcpcb(inp); 492 TCPDEBUG1(); 493 SOCK_LOCK(so); 494 error = solisten_proto_check(so); 495 INP_HASH_WLOCK(&V_tcbinfo); 496 if (error == 0 && inp->inp_lport == 0) { 497 inp->inp_vflag &= ~INP_IPV4; 498 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 499 inp->inp_vflag |= INP_IPV4; 500 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 501 } 502 INP_HASH_WUNLOCK(&V_tcbinfo); 503 if (error == 0) { 504 tcp_state_change(tp, TCPS_LISTEN); 505 solisten_proto(so, backlog); 506 #ifdef TCP_OFFLOAD 507 if ((so->so_options & SO_NO_OFFLOAD) == 0) 508 tcp_offload_listen_start(tp); 509 #endif 510 } 511 SOCK_UNLOCK(so); 512 513 if (IS_FASTOPEN(tp->t_flags)) 514 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 515 516 if (error != 0) 517 inp->inp_vflag = vflagsav; 518 519 out: 520 TCPDEBUG2(PRU_LISTEN); 521 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 522 INP_WUNLOCK(inp); 523 return (error); 524 } 525 #endif /* INET6 */ 526 527 #ifdef INET 528 /* 529 * Initiate connection to peer. 530 * Create a template for use in transmissions on this connection. 531 * Enter SYN_SENT state, and mark socket as connecting. 532 * Start keep-alive timer, and seed output sequence space. 533 * Send initial segment on connection. 534 */ 535 static int 536 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 537 { 538 struct epoch_tracker et; 539 int error = 0; 540 struct inpcb *inp; 541 struct tcpcb *tp = NULL; 542 struct sockaddr_in *sinp; 543 544 sinp = (struct sockaddr_in *)nam; 545 if (nam->sa_len != sizeof (*sinp)) 546 return (EINVAL); 547 /* 548 * Must disallow TCP ``connections'' to multicast addresses. 549 */ 550 if (sinp->sin_family == AF_INET 551 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 552 return (EAFNOSUPPORT); 553 if ((sinp->sin_family == AF_INET) && 554 (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST)) 555 return (EACCES); 556 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 557 return (error); 558 559 TCPDEBUG0; 560 inp = sotoinpcb(so); 561 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 562 INP_WLOCK(inp); 563 if (inp->inp_flags & INP_TIMEWAIT) { 564 error = EADDRINUSE; 565 goto out; 566 } 567 if (inp->inp_flags & INP_DROPPED) { 568 error = ECONNREFUSED; 569 goto out; 570 } 571 tp = intotcpcb(inp); 572 TCPDEBUG1(); 573 NET_EPOCH_ENTER(et); 574 if ((error = tcp_connect(tp, nam, td)) != 0) 575 goto out_in_epoch; 576 #ifdef TCP_OFFLOAD 577 if (registered_toedevs > 0 && 578 (so->so_options & SO_NO_OFFLOAD) == 0 && 579 (error = tcp_offload_connect(so, nam)) == 0) 580 goto out_in_epoch; 581 #endif 582 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 583 error = tp->t_fb->tfb_tcp_output(tp); 584 out_in_epoch: 585 NET_EPOCH_EXIT(et); 586 out: 587 TCPDEBUG2(PRU_CONNECT); 588 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 589 INP_WUNLOCK(inp); 590 return (error); 591 } 592 #endif /* INET */ 593 594 #ifdef INET6 595 static int 596 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 597 { 598 struct epoch_tracker et; 599 int error = 0; 600 struct inpcb *inp; 601 struct tcpcb *tp = NULL; 602 struct sockaddr_in6 *sin6; 603 u_int8_t incflagsav; 604 u_char vflagsav; 605 606 TCPDEBUG0; 607 608 sin6 = (struct sockaddr_in6 *)nam; 609 if (nam->sa_len != sizeof (*sin6)) 610 return (EINVAL); 611 /* 612 * Must disallow TCP ``connections'' to multicast addresses. 613 */ 614 if (sin6->sin6_family == AF_INET6 615 && IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) 616 return (EAFNOSUPPORT); 617 618 inp = sotoinpcb(so); 619 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 620 INP_WLOCK(inp); 621 vflagsav = inp->inp_vflag; 622 incflagsav = inp->inp_inc.inc_flags; 623 if (inp->inp_flags & INP_TIMEWAIT) { 624 error = EADDRINUSE; 625 goto out; 626 } 627 if (inp->inp_flags & INP_DROPPED) { 628 error = ECONNREFUSED; 629 goto out; 630 } 631 tp = intotcpcb(inp); 632 TCPDEBUG1(); 633 #ifdef INET 634 /* 635 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 636 * therefore probably require the hash lock, which isn't held here. 637 * Is this a significant problem? 638 */ 639 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 640 struct sockaddr_in sin; 641 642 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 643 error = EINVAL; 644 goto out; 645 } 646 if ((inp->inp_vflag & INP_IPV4) == 0) { 647 error = EAFNOSUPPORT; 648 goto out; 649 } 650 651 in6_sin6_2_sin(&sin, sin6); 652 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 653 error = EAFNOSUPPORT; 654 goto out; 655 } 656 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) { 657 error = EACCES; 658 goto out; 659 } 660 if ((error = prison_remote_ip4(td->td_ucred, 661 &sin.sin_addr)) != 0) 662 goto out; 663 inp->inp_vflag |= INP_IPV4; 664 inp->inp_vflag &= ~INP_IPV6; 665 NET_EPOCH_ENTER(et); 666 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 667 goto out_in_epoch; 668 #ifdef TCP_OFFLOAD 669 if (registered_toedevs > 0 && 670 (so->so_options & SO_NO_OFFLOAD) == 0 && 671 (error = tcp_offload_connect(so, nam)) == 0) 672 goto out_in_epoch; 673 #endif 674 error = tp->t_fb->tfb_tcp_output(tp); 675 goto out_in_epoch; 676 } else { 677 if ((inp->inp_vflag & INP_IPV6) == 0) { 678 error = EAFNOSUPPORT; 679 goto out; 680 } 681 } 682 #endif 683 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 684 goto out; 685 inp->inp_vflag &= ~INP_IPV4; 686 inp->inp_vflag |= INP_IPV6; 687 inp->inp_inc.inc_flags |= INC_ISIPV6; 688 if ((error = tcp6_connect(tp, nam, td)) != 0) 689 goto out; 690 #ifdef TCP_OFFLOAD 691 if (registered_toedevs > 0 && 692 (so->so_options & SO_NO_OFFLOAD) == 0 && 693 (error = tcp_offload_connect(so, nam)) == 0) 694 goto out; 695 #endif 696 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 697 NET_EPOCH_ENTER(et); 698 error = tp->t_fb->tfb_tcp_output(tp); 699 #ifdef INET 700 out_in_epoch: 701 #endif 702 NET_EPOCH_EXIT(et); 703 out: 704 /* 705 * If the implicit bind in the connect call fails, restore 706 * the flags we modified. 707 */ 708 if (error != 0 && inp->inp_lport == 0) { 709 inp->inp_vflag = vflagsav; 710 inp->inp_inc.inc_flags = incflagsav; 711 } 712 713 TCPDEBUG2(PRU_CONNECT); 714 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 715 INP_WUNLOCK(inp); 716 return (error); 717 } 718 #endif /* INET6 */ 719 720 /* 721 * Initiate disconnect from peer. 722 * If connection never passed embryonic stage, just drop; 723 * else if don't need to let data drain, then can just drop anyways, 724 * else have to begin TCP shutdown process: mark socket disconnecting, 725 * drain unread data, state switch to reflect user close, and 726 * send segment (e.g. FIN) to peer. Socket will be really disconnected 727 * when peer sends FIN and acks ours. 728 * 729 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 730 */ 731 static int 732 tcp_usr_disconnect(struct socket *so) 733 { 734 struct inpcb *inp; 735 struct tcpcb *tp = NULL; 736 struct epoch_tracker et; 737 int error = 0; 738 739 TCPDEBUG0; 740 NET_EPOCH_ENTER(et); 741 inp = sotoinpcb(so); 742 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 743 INP_WLOCK(inp); 744 if (inp->inp_flags & INP_TIMEWAIT) 745 goto out; 746 if (inp->inp_flags & INP_DROPPED) { 747 error = ECONNRESET; 748 goto out; 749 } 750 tp = intotcpcb(inp); 751 TCPDEBUG1(); 752 tcp_disconnect(tp); 753 out: 754 TCPDEBUG2(PRU_DISCONNECT); 755 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 756 INP_WUNLOCK(inp); 757 NET_EPOCH_EXIT(et); 758 return (error); 759 } 760 761 #ifdef INET 762 /* 763 * Accept a connection. Essentially all the work is done at higher levels; 764 * just return the address of the peer, storing through addr. 765 */ 766 static int 767 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 768 { 769 int error = 0; 770 struct inpcb *inp = NULL; 771 struct tcpcb *tp = NULL; 772 struct in_addr addr; 773 in_port_t port = 0; 774 TCPDEBUG0; 775 776 if (so->so_state & SS_ISDISCONNECTED) 777 return (ECONNABORTED); 778 779 inp = sotoinpcb(so); 780 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 781 INP_WLOCK(inp); 782 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 783 error = ECONNABORTED; 784 goto out; 785 } 786 tp = intotcpcb(inp); 787 TCPDEBUG1(); 788 789 /* 790 * We inline in_getpeeraddr and COMMON_END here, so that we can 791 * copy the data of interest and defer the malloc until after we 792 * release the lock. 793 */ 794 port = inp->inp_fport; 795 addr = inp->inp_faddr; 796 797 out: 798 TCPDEBUG2(PRU_ACCEPT); 799 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 800 INP_WUNLOCK(inp); 801 if (error == 0) 802 *nam = in_sockaddr(port, &addr); 803 return error; 804 } 805 #endif /* INET */ 806 807 #ifdef INET6 808 static int 809 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 810 { 811 struct inpcb *inp = NULL; 812 int error = 0; 813 struct tcpcb *tp = NULL; 814 struct in_addr addr; 815 struct in6_addr addr6; 816 struct epoch_tracker et; 817 in_port_t port = 0; 818 int v4 = 0; 819 TCPDEBUG0; 820 821 if (so->so_state & SS_ISDISCONNECTED) 822 return (ECONNABORTED); 823 824 inp = sotoinpcb(so); 825 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 826 NET_EPOCH_ENTER(et); 827 INP_WLOCK(inp); 828 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 829 error = ECONNABORTED; 830 goto out; 831 } 832 tp = intotcpcb(inp); 833 TCPDEBUG1(); 834 835 /* 836 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 837 * copy the data of interest and defer the malloc until after we 838 * release the lock. 839 */ 840 if (inp->inp_vflag & INP_IPV4) { 841 v4 = 1; 842 port = inp->inp_fport; 843 addr = inp->inp_faddr; 844 } else { 845 port = inp->inp_fport; 846 addr6 = inp->in6p_faddr; 847 } 848 849 out: 850 TCPDEBUG2(PRU_ACCEPT); 851 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 852 INP_WUNLOCK(inp); 853 NET_EPOCH_EXIT(et); 854 if (error == 0) { 855 if (v4) 856 *nam = in6_v4mapsin6_sockaddr(port, &addr); 857 else 858 *nam = in6_sockaddr(port, &addr6); 859 } 860 return error; 861 } 862 #endif /* INET6 */ 863 864 /* 865 * Mark the connection as being incapable of further output. 866 */ 867 static int 868 tcp_usr_shutdown(struct socket *so) 869 { 870 int error = 0; 871 struct inpcb *inp; 872 struct tcpcb *tp = NULL; 873 struct epoch_tracker et; 874 875 TCPDEBUG0; 876 NET_EPOCH_ENTER(et); 877 inp = sotoinpcb(so); 878 KASSERT(inp != NULL, ("inp == NULL")); 879 INP_WLOCK(inp); 880 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 881 error = ECONNRESET; 882 goto out; 883 } 884 tp = intotcpcb(inp); 885 TCPDEBUG1(); 886 socantsendmore(so); 887 tcp_usrclosed(tp); 888 if (!(inp->inp_flags & INP_DROPPED)) 889 error = tp->t_fb->tfb_tcp_output(tp); 890 891 out: 892 TCPDEBUG2(PRU_SHUTDOWN); 893 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 894 INP_WUNLOCK(inp); 895 NET_EPOCH_EXIT(et); 896 897 return (error); 898 } 899 900 /* 901 * After a receive, possibly send window update to peer. 902 */ 903 static int 904 tcp_usr_rcvd(struct socket *so, int flags) 905 { 906 struct epoch_tracker et; 907 struct inpcb *inp; 908 struct tcpcb *tp = NULL; 909 int error = 0; 910 911 TCPDEBUG0; 912 inp = sotoinpcb(so); 913 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 914 INP_WLOCK(inp); 915 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 916 error = ECONNRESET; 917 goto out; 918 } 919 tp = intotcpcb(inp); 920 TCPDEBUG1(); 921 /* 922 * For passively-created TFO connections, don't attempt a window 923 * update while still in SYN_RECEIVED as this may trigger an early 924 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 925 * application response data, or failing that, when the DELACK timer 926 * expires. 927 */ 928 if (IS_FASTOPEN(tp->t_flags) && 929 (tp->t_state == TCPS_SYN_RECEIVED)) 930 goto out; 931 NET_EPOCH_ENTER(et); 932 #ifdef TCP_OFFLOAD 933 if (tp->t_flags & TF_TOE) 934 tcp_offload_rcvd(tp); 935 else 936 #endif 937 tp->t_fb->tfb_tcp_output(tp); 938 NET_EPOCH_EXIT(et); 939 out: 940 TCPDEBUG2(PRU_RCVD); 941 TCP_PROBE2(debug__user, tp, PRU_RCVD); 942 INP_WUNLOCK(inp); 943 return (error); 944 } 945 946 /* 947 * Do a send by putting data in output queue and updating urgent 948 * marker if URG set. Possibly send more data. Unlike the other 949 * pru_*() routines, the mbuf chains are our responsibility. We 950 * must either enqueue them or free them. The other pru_* routines 951 * generally are caller-frees. 952 */ 953 static int 954 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 955 struct sockaddr *nam, struct mbuf *control, struct thread *td) 956 { 957 struct epoch_tracker et; 958 int error = 0; 959 struct inpcb *inp; 960 struct tcpcb *tp = NULL; 961 #ifdef INET 962 #ifdef INET6 963 struct sockaddr_in sin; 964 #endif 965 struct sockaddr_in *sinp; 966 #endif 967 #ifdef INET6 968 int isipv6; 969 #endif 970 u_int8_t incflagsav; 971 u_char vflagsav; 972 bool restoreflags; 973 TCPDEBUG0; 974 975 /* 976 * We require the pcbinfo "read lock" if we will close the socket 977 * as part of this call. 978 */ 979 NET_EPOCH_ENTER(et); 980 inp = sotoinpcb(so); 981 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 982 INP_WLOCK(inp); 983 vflagsav = inp->inp_vflag; 984 incflagsav = inp->inp_inc.inc_flags; 985 restoreflags = false; 986 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 987 if (control) 988 m_freem(control); 989 /* 990 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 991 * for freeing memory. 992 */ 993 if (m && (flags & PRUS_NOTREADY) == 0) 994 m_freem(m); 995 error = ECONNRESET; 996 goto out; 997 } 998 tp = intotcpcb(inp); 999 if (flags & PRUS_OOB) { 1000 if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) { 1001 if (control) 1002 m_freem(control); 1003 if (m && (flags & PRUS_NOTREADY) == 0) 1004 m_freem(m); 1005 goto out; 1006 } 1007 } 1008 TCPDEBUG1(); 1009 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 1010 switch (nam->sa_family) { 1011 #ifdef INET 1012 case AF_INET: 1013 sinp = (struct sockaddr_in *)nam; 1014 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 1015 if (m) 1016 m_freem(m); 1017 error = EINVAL; 1018 goto out; 1019 } 1020 if ((inp->inp_vflag & INP_IPV6) != 0) { 1021 if (m) 1022 m_freem(m); 1023 error = EAFNOSUPPORT; 1024 goto out; 1025 } 1026 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 1027 if (m) 1028 m_freem(m); 1029 error = EAFNOSUPPORT; 1030 goto out; 1031 } 1032 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 1033 if (m) 1034 m_freem(m); 1035 error = EACCES; 1036 goto out; 1037 } 1038 if ((error = prison_remote_ip4(td->td_ucred, 1039 &sinp->sin_addr))) { 1040 if (m) 1041 m_freem(m); 1042 goto out; 1043 } 1044 #ifdef INET6 1045 isipv6 = 0; 1046 #endif 1047 break; 1048 #endif /* INET */ 1049 #ifdef INET6 1050 case AF_INET6: 1051 { 1052 struct sockaddr_in6 *sin6; 1053 1054 sin6 = (struct sockaddr_in6 *)nam; 1055 if (sin6->sin6_len != sizeof(*sin6)) { 1056 if (m) 1057 m_freem(m); 1058 error = EINVAL; 1059 goto out; 1060 } 1061 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 1062 if (m != NULL) 1063 m_freem(m); 1064 error = EAFNOSUPPORT; 1065 goto out; 1066 } 1067 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1068 if (m) 1069 m_freem(m); 1070 error = EAFNOSUPPORT; 1071 goto out; 1072 } 1073 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1074 #ifdef INET 1075 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1076 error = EINVAL; 1077 if (m) 1078 m_freem(m); 1079 goto out; 1080 } 1081 if ((inp->inp_vflag & INP_IPV4) == 0) { 1082 error = EAFNOSUPPORT; 1083 if (m) 1084 m_freem(m); 1085 goto out; 1086 } 1087 restoreflags = true; 1088 inp->inp_vflag &= ~INP_IPV6; 1089 sinp = &sin; 1090 in6_sin6_2_sin(sinp, sin6); 1091 if (IN_MULTICAST( 1092 ntohl(sinp->sin_addr.s_addr))) { 1093 error = EAFNOSUPPORT; 1094 if (m) 1095 m_freem(m); 1096 goto out; 1097 } 1098 if ((error = prison_remote_ip4(td->td_ucred, 1099 &sinp->sin_addr))) { 1100 if (m) 1101 m_freem(m); 1102 goto out; 1103 } 1104 isipv6 = 0; 1105 #else /* !INET */ 1106 error = EAFNOSUPPORT; 1107 if (m) 1108 m_freem(m); 1109 goto out; 1110 #endif /* INET */ 1111 } else { 1112 if ((inp->inp_vflag & INP_IPV6) == 0) { 1113 if (m) 1114 m_freem(m); 1115 error = EAFNOSUPPORT; 1116 goto out; 1117 } 1118 restoreflags = true; 1119 inp->inp_vflag &= ~INP_IPV4; 1120 inp->inp_inc.inc_flags |= INC_ISIPV6; 1121 if ((error = prison_remote_ip6(td->td_ucred, 1122 &sin6->sin6_addr))) { 1123 if (m) 1124 m_freem(m); 1125 goto out; 1126 } 1127 isipv6 = 1; 1128 } 1129 break; 1130 } 1131 #endif /* INET6 */ 1132 default: 1133 if (m) 1134 m_freem(m); 1135 error = EAFNOSUPPORT; 1136 goto out; 1137 } 1138 } 1139 if (control) { 1140 /* TCP doesn't do control messages (rights, creds, etc) */ 1141 if (control->m_len) { 1142 m_freem(control); 1143 if (m) 1144 m_freem(m); 1145 error = EINVAL; 1146 goto out; 1147 } 1148 m_freem(control); /* empty control, just free it */ 1149 } 1150 if (!(flags & PRUS_OOB)) { 1151 sbappendstream(&so->so_snd, m, flags); 1152 if (nam && tp->t_state < TCPS_SYN_SENT) { 1153 /* 1154 * Do implied connect if not yet connected, 1155 * initialize window to default value, and 1156 * initialize maxseg using peer's cached MSS. 1157 */ 1158 #ifdef INET6 1159 if (isipv6) 1160 error = tcp6_connect(tp, nam, td); 1161 #endif /* INET6 */ 1162 #if defined(INET6) && defined(INET) 1163 else 1164 #endif 1165 #ifdef INET 1166 error = tcp_connect(tp, 1167 (struct sockaddr *)sinp, td); 1168 #endif 1169 /* 1170 * The bind operation in tcp_connect succeeded. We 1171 * no longer want to restore the flags if later 1172 * operations fail. 1173 */ 1174 if (error == 0 || inp->inp_lport != 0) 1175 restoreflags = false; 1176 1177 if (error) 1178 goto out; 1179 if (IS_FASTOPEN(tp->t_flags)) 1180 tcp_fastopen_connect(tp); 1181 else { 1182 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1183 tcp_mss(tp, -1); 1184 } 1185 } 1186 if (flags & PRUS_EOF) { 1187 /* 1188 * Close the send side of the connection after 1189 * the data is sent. 1190 */ 1191 socantsendmore(so); 1192 tcp_usrclosed(tp); 1193 } 1194 if (TCPS_HAVEESTABLISHED(tp->t_state) && 1195 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 1196 (tp->t_fbyte_out == 0) && 1197 (so->so_snd.sb_ccc > 0)) { 1198 tp->t_fbyte_out = ticks; 1199 if (tp->t_fbyte_out == 0) 1200 tp->t_fbyte_out = 1; 1201 if (tp->t_fbyte_out && tp->t_fbyte_in) 1202 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 1203 } 1204 if (!(inp->inp_flags & INP_DROPPED) && 1205 !(flags & PRUS_NOTREADY)) { 1206 if (flags & PRUS_MORETOCOME) 1207 tp->t_flags |= TF_MORETOCOME; 1208 error = tp->t_fb->tfb_tcp_output(tp); 1209 if (flags & PRUS_MORETOCOME) 1210 tp->t_flags &= ~TF_MORETOCOME; 1211 } 1212 } else { 1213 /* 1214 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1215 */ 1216 SOCKBUF_LOCK(&so->so_snd); 1217 if (sbspace(&so->so_snd) < -512) { 1218 SOCKBUF_UNLOCK(&so->so_snd); 1219 m_freem(m); 1220 error = ENOBUFS; 1221 goto out; 1222 } 1223 /* 1224 * According to RFC961 (Assigned Protocols), 1225 * the urgent pointer points to the last octet 1226 * of urgent data. We continue, however, 1227 * to consider it to indicate the first octet 1228 * of data past the urgent section. 1229 * Otherwise, snd_up should be one lower. 1230 */ 1231 sbappendstream_locked(&so->so_snd, m, flags); 1232 SOCKBUF_UNLOCK(&so->so_snd); 1233 if (nam && tp->t_state < TCPS_SYN_SENT) { 1234 /* 1235 * Do implied connect if not yet connected, 1236 * initialize window to default value, and 1237 * initialize maxseg using peer's cached MSS. 1238 */ 1239 1240 /* 1241 * Not going to contemplate SYN|URG 1242 */ 1243 if (IS_FASTOPEN(tp->t_flags)) 1244 tp->t_flags &= ~TF_FASTOPEN; 1245 #ifdef INET6 1246 if (isipv6) 1247 error = tcp6_connect(tp, nam, td); 1248 #endif /* INET6 */ 1249 #if defined(INET6) && defined(INET) 1250 else 1251 #endif 1252 #ifdef INET 1253 error = tcp_connect(tp, 1254 (struct sockaddr *)sinp, td); 1255 #endif 1256 /* 1257 * The bind operation in tcp_connect succeeded. We 1258 * no longer want to restore the flags if later 1259 * operations fail. 1260 */ 1261 if (error == 0 || inp->inp_lport != 0) 1262 restoreflags = false; 1263 1264 if (error) 1265 goto out; 1266 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1267 tcp_mss(tp, -1); 1268 } 1269 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1270 if (!(flags & PRUS_NOTREADY)) { 1271 tp->t_flags |= TF_FORCEDATA; 1272 error = tp->t_fb->tfb_tcp_output(tp); 1273 tp->t_flags &= ~TF_FORCEDATA; 1274 } 1275 } 1276 TCP_LOG_EVENT(tp, NULL, 1277 &inp->inp_socket->so_rcv, 1278 &inp->inp_socket->so_snd, 1279 TCP_LOG_USERSEND, error, 1280 0, NULL, false); 1281 out: 1282 /* 1283 * If the request was unsuccessful and we changed flags, 1284 * restore the original flags. 1285 */ 1286 if (error != 0 && restoreflags) { 1287 inp->inp_vflag = vflagsav; 1288 inp->inp_inc.inc_flags = incflagsav; 1289 } 1290 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 1291 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1292 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1293 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1294 INP_WUNLOCK(inp); 1295 NET_EPOCH_EXIT(et); 1296 return (error); 1297 } 1298 1299 static int 1300 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1301 { 1302 struct epoch_tracker et; 1303 struct inpcb *inp; 1304 struct tcpcb *tp; 1305 int error; 1306 1307 inp = sotoinpcb(so); 1308 INP_WLOCK(inp); 1309 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1310 INP_WUNLOCK(inp); 1311 mb_free_notready(m, count); 1312 return (ECONNRESET); 1313 } 1314 tp = intotcpcb(inp); 1315 1316 SOCKBUF_LOCK(&so->so_snd); 1317 error = sbready(&so->so_snd, m, count); 1318 SOCKBUF_UNLOCK(&so->so_snd); 1319 if (error == 0) { 1320 NET_EPOCH_ENTER(et); 1321 error = tp->t_fb->tfb_tcp_output(tp); 1322 NET_EPOCH_EXIT(et); 1323 } 1324 INP_WUNLOCK(inp); 1325 1326 return (error); 1327 } 1328 1329 /* 1330 * Abort the TCP. Drop the connection abruptly. 1331 */ 1332 static void 1333 tcp_usr_abort(struct socket *so) 1334 { 1335 struct inpcb *inp; 1336 struct tcpcb *tp = NULL; 1337 struct epoch_tracker et; 1338 TCPDEBUG0; 1339 1340 inp = sotoinpcb(so); 1341 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1342 1343 NET_EPOCH_ENTER(et); 1344 INP_WLOCK(inp); 1345 KASSERT(inp->inp_socket != NULL, 1346 ("tcp_usr_abort: inp_socket == NULL")); 1347 1348 /* 1349 * If we still have full TCP state, and we're not dropped, drop. 1350 */ 1351 if (!(inp->inp_flags & INP_TIMEWAIT) && 1352 !(inp->inp_flags & INP_DROPPED)) { 1353 tp = intotcpcb(inp); 1354 TCPDEBUG1(); 1355 tp = tcp_drop(tp, ECONNABORTED); 1356 if (tp == NULL) 1357 goto dropped; 1358 TCPDEBUG2(PRU_ABORT); 1359 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1360 } 1361 if (!(inp->inp_flags & INP_DROPPED)) { 1362 SOCK_LOCK(so); 1363 so->so_state |= SS_PROTOREF; 1364 SOCK_UNLOCK(so); 1365 inp->inp_flags |= INP_SOCKREF; 1366 } 1367 INP_WUNLOCK(inp); 1368 dropped: 1369 NET_EPOCH_EXIT(et); 1370 } 1371 1372 /* 1373 * TCP socket is closed. Start friendly disconnect. 1374 */ 1375 static void 1376 tcp_usr_close(struct socket *so) 1377 { 1378 struct inpcb *inp; 1379 struct tcpcb *tp = NULL; 1380 struct epoch_tracker et; 1381 TCPDEBUG0; 1382 1383 inp = sotoinpcb(so); 1384 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1385 1386 NET_EPOCH_ENTER(et); 1387 INP_WLOCK(inp); 1388 KASSERT(inp->inp_socket != NULL, 1389 ("tcp_usr_close: inp_socket == NULL")); 1390 1391 /* 1392 * If we still have full TCP state, and we're not dropped, initiate 1393 * a disconnect. 1394 */ 1395 if (!(inp->inp_flags & INP_TIMEWAIT) && 1396 !(inp->inp_flags & INP_DROPPED)) { 1397 tp = intotcpcb(inp); 1398 TCPDEBUG1(); 1399 tcp_disconnect(tp); 1400 TCPDEBUG2(PRU_CLOSE); 1401 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1402 } 1403 if (!(inp->inp_flags & INP_DROPPED)) { 1404 SOCK_LOCK(so); 1405 so->so_state |= SS_PROTOREF; 1406 SOCK_UNLOCK(so); 1407 inp->inp_flags |= INP_SOCKREF; 1408 } 1409 INP_WUNLOCK(inp); 1410 NET_EPOCH_EXIT(et); 1411 } 1412 1413 static int 1414 tcp_pru_options_support(struct tcpcb *tp, int flags) 1415 { 1416 /* 1417 * If the specific TCP stack has a pru_options 1418 * specified then it does not always support 1419 * all the PRU_XX options and we must ask it. 1420 * If the function is not specified then all 1421 * of the PRU_XX options are supported. 1422 */ 1423 int ret = 0; 1424 1425 if (tp->t_fb->tfb_pru_options) { 1426 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1427 } 1428 return (ret); 1429 } 1430 1431 /* 1432 * Receive out-of-band data. 1433 */ 1434 static int 1435 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1436 { 1437 int error = 0; 1438 struct inpcb *inp; 1439 struct tcpcb *tp = NULL; 1440 1441 TCPDEBUG0; 1442 inp = sotoinpcb(so); 1443 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1444 INP_WLOCK(inp); 1445 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1446 error = ECONNRESET; 1447 goto out; 1448 } 1449 tp = intotcpcb(inp); 1450 error = tcp_pru_options_support(tp, PRUS_OOB); 1451 if (error) { 1452 goto out; 1453 } 1454 TCPDEBUG1(); 1455 if ((so->so_oobmark == 0 && 1456 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1457 so->so_options & SO_OOBINLINE || 1458 tp->t_oobflags & TCPOOB_HADDATA) { 1459 error = EINVAL; 1460 goto out; 1461 } 1462 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1463 error = EWOULDBLOCK; 1464 goto out; 1465 } 1466 m->m_len = 1; 1467 *mtod(m, caddr_t) = tp->t_iobc; 1468 if ((flags & MSG_PEEK) == 0) 1469 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1470 1471 out: 1472 TCPDEBUG2(PRU_RCVOOB); 1473 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1474 INP_WUNLOCK(inp); 1475 return (error); 1476 } 1477 1478 #ifdef INET 1479 struct pr_usrreqs tcp_usrreqs = { 1480 .pru_abort = tcp_usr_abort, 1481 .pru_accept = tcp_usr_accept, 1482 .pru_attach = tcp_usr_attach, 1483 .pru_bind = tcp_usr_bind, 1484 .pru_connect = tcp_usr_connect, 1485 .pru_control = in_control, 1486 .pru_detach = tcp_usr_detach, 1487 .pru_disconnect = tcp_usr_disconnect, 1488 .pru_listen = tcp_usr_listen, 1489 .pru_peeraddr = in_getpeeraddr, 1490 .pru_rcvd = tcp_usr_rcvd, 1491 .pru_rcvoob = tcp_usr_rcvoob, 1492 .pru_send = tcp_usr_send, 1493 .pru_ready = tcp_usr_ready, 1494 .pru_shutdown = tcp_usr_shutdown, 1495 .pru_sockaddr = in_getsockaddr, 1496 .pru_sosetlabel = in_pcbsosetlabel, 1497 .pru_close = tcp_usr_close, 1498 }; 1499 #endif /* INET */ 1500 1501 #ifdef INET6 1502 struct pr_usrreqs tcp6_usrreqs = { 1503 .pru_abort = tcp_usr_abort, 1504 .pru_accept = tcp6_usr_accept, 1505 .pru_attach = tcp_usr_attach, 1506 .pru_bind = tcp6_usr_bind, 1507 .pru_connect = tcp6_usr_connect, 1508 .pru_control = in6_control, 1509 .pru_detach = tcp_usr_detach, 1510 .pru_disconnect = tcp_usr_disconnect, 1511 .pru_listen = tcp6_usr_listen, 1512 .pru_peeraddr = in6_mapped_peeraddr, 1513 .pru_rcvd = tcp_usr_rcvd, 1514 .pru_rcvoob = tcp_usr_rcvoob, 1515 .pru_send = tcp_usr_send, 1516 .pru_ready = tcp_usr_ready, 1517 .pru_shutdown = tcp_usr_shutdown, 1518 .pru_sockaddr = in6_mapped_sockaddr, 1519 .pru_sosetlabel = in_pcbsosetlabel, 1520 .pru_close = tcp_usr_close, 1521 }; 1522 #endif /* INET6 */ 1523 1524 #ifdef INET 1525 /* 1526 * Common subroutine to open a TCP connection to remote host specified 1527 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1528 * port number if needed. Call in_pcbconnect_setup to do the routing and 1529 * to choose a local host address (interface). If there is an existing 1530 * incarnation of the same connection in TIME-WAIT state and if the remote 1531 * host was sending CC options and if the connection duration was < MSL, then 1532 * truncate the previous TIME-WAIT state and proceed. 1533 * Initialize connection parameters and enter SYN-SENT state. 1534 */ 1535 static int 1536 tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1537 { 1538 struct inpcb *inp = tp->t_inpcb, *oinp; 1539 struct socket *so = inp->inp_socket; 1540 struct in_addr laddr; 1541 u_short lport; 1542 int error; 1543 1544 NET_EPOCH_ASSERT(); 1545 INP_WLOCK_ASSERT(inp); 1546 INP_HASH_WLOCK(&V_tcbinfo); 1547 1548 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1549 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1550 if (error) 1551 goto out; 1552 } 1553 1554 /* 1555 * Cannot simply call in_pcbconnect, because there might be an 1556 * earlier incarnation of this same connection still in 1557 * TIME_WAIT state, creating an ADDRINUSE error. 1558 */ 1559 laddr = inp->inp_laddr; 1560 lport = inp->inp_lport; 1561 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1562 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1563 if (error && oinp == NULL) 1564 goto out; 1565 if (oinp) { 1566 error = EADDRINUSE; 1567 goto out; 1568 } 1569 /* Handle initial bind if it hadn't been done in advance. */ 1570 if (inp->inp_lport == 0) { 1571 inp->inp_lport = lport; 1572 if (in_pcbinshash(inp) != 0) { 1573 inp->inp_lport = 0; 1574 error = EAGAIN; 1575 goto out; 1576 } 1577 } 1578 inp->inp_laddr = laddr; 1579 in_pcbrehash(inp); 1580 INP_HASH_WUNLOCK(&V_tcbinfo); 1581 1582 /* 1583 * Compute window scaling to request: 1584 * Scale to fit into sweet spot. See tcp_syncache.c. 1585 * XXX: This should move to tcp_output(). 1586 */ 1587 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1588 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1589 tp->request_r_scale++; 1590 1591 soisconnecting(so); 1592 TCPSTAT_INC(tcps_connattempt); 1593 tcp_state_change(tp, TCPS_SYN_SENT); 1594 tp->iss = tcp_new_isn(&inp->inp_inc); 1595 if (tp->t_flags & TF_REQ_TSTMP) 1596 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1597 tcp_sendseqinit(tp); 1598 1599 return 0; 1600 1601 out: 1602 INP_HASH_WUNLOCK(&V_tcbinfo); 1603 return (error); 1604 } 1605 #endif /* INET */ 1606 1607 #ifdef INET6 1608 static int 1609 tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1610 { 1611 struct inpcb *inp = tp->t_inpcb; 1612 int error; 1613 1614 INP_WLOCK_ASSERT(inp); 1615 INP_HASH_WLOCK(&V_tcbinfo); 1616 1617 if (V_tcp_require_unique_port && inp->inp_lport == 0) { 1618 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1619 if (error) 1620 goto out; 1621 } 1622 error = in6_pcbconnect(inp, nam, td->td_ucred); 1623 if (error != 0) 1624 goto out; 1625 INP_HASH_WUNLOCK(&V_tcbinfo); 1626 1627 /* Compute window scaling to request. */ 1628 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1629 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1630 tp->request_r_scale++; 1631 1632 soisconnecting(inp->inp_socket); 1633 TCPSTAT_INC(tcps_connattempt); 1634 tcp_state_change(tp, TCPS_SYN_SENT); 1635 tp->iss = tcp_new_isn(&inp->inp_inc); 1636 if (tp->t_flags & TF_REQ_TSTMP) 1637 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1638 tcp_sendseqinit(tp); 1639 1640 return 0; 1641 1642 out: 1643 INP_HASH_WUNLOCK(&V_tcbinfo); 1644 return error; 1645 } 1646 #endif /* INET6 */ 1647 1648 /* 1649 * Export TCP internal state information via a struct tcp_info, based on the 1650 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1651 * (TCP state machine, etc). We export all information using FreeBSD-native 1652 * constants -- for example, the numeric values for tcpi_state will differ 1653 * from Linux. 1654 */ 1655 static void 1656 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1657 { 1658 1659 INP_WLOCK_ASSERT(tp->t_inpcb); 1660 bzero(ti, sizeof(*ti)); 1661 1662 ti->tcpi_state = tp->t_state; 1663 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1664 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1665 if (tp->t_flags & TF_SACK_PERMIT) 1666 ti->tcpi_options |= TCPI_OPT_SACK; 1667 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1668 ti->tcpi_options |= TCPI_OPT_WSCALE; 1669 ti->tcpi_snd_wscale = tp->snd_scale; 1670 ti->tcpi_rcv_wscale = tp->rcv_scale; 1671 } 1672 if (tp->t_flags2 & TF2_ECN_PERMIT) 1673 ti->tcpi_options |= TCPI_OPT_ECN; 1674 1675 ti->tcpi_rto = tp->t_rxtcur * tick; 1676 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1677 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1678 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1679 1680 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1681 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1682 1683 /* 1684 * FreeBSD-specific extension fields for tcp_info. 1685 */ 1686 ti->tcpi_rcv_space = tp->rcv_wnd; 1687 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1688 ti->tcpi_snd_wnd = tp->snd_wnd; 1689 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1690 ti->tcpi_snd_nxt = tp->snd_nxt; 1691 ti->tcpi_snd_mss = tp->t_maxseg; 1692 ti->tcpi_rcv_mss = tp->t_maxseg; 1693 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1694 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1695 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1696 #ifdef TCP_OFFLOAD 1697 if (tp->t_flags & TF_TOE) { 1698 ti->tcpi_options |= TCPI_OPT_TOE; 1699 tcp_offload_tcp_info(tp, ti); 1700 } 1701 #endif 1702 } 1703 1704 /* 1705 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1706 * socket option arguments. When it re-acquires the lock after the copy, it 1707 * has to revalidate that the connection is still valid for the socket 1708 * option. 1709 */ 1710 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1711 INP_WLOCK(inp); \ 1712 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1713 INP_WUNLOCK(inp); \ 1714 cleanup; \ 1715 return (ECONNRESET); \ 1716 } \ 1717 tp = intotcpcb(inp); \ 1718 } while(0) 1719 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1720 1721 int 1722 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1723 { 1724 int error; 1725 struct inpcb *inp; 1726 struct tcpcb *tp; 1727 struct tcp_function_block *blk; 1728 struct tcp_function_set fsn; 1729 1730 error = 0; 1731 inp = sotoinpcb(so); 1732 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1733 if (sopt->sopt_level != IPPROTO_TCP) { 1734 #ifdef INET6 1735 if (inp->inp_vflag & INP_IPV6PROTO) { 1736 error = ip6_ctloutput(so, sopt); 1737 /* 1738 * In case of the IPV6_USE_MIN_MTU socket option, 1739 * the INC_IPV6MINMTU flag to announce a corresponding 1740 * MSS during the initial handshake. 1741 * If the TCP connection is not in the front states, 1742 * just reduce the MSS being used. 1743 * This avoids the sending of TCP segments which will 1744 * be fragmented at the IPv6 layer. 1745 */ 1746 if ((error == 0) && 1747 (sopt->sopt_dir == SOPT_SET) && 1748 (sopt->sopt_level == IPPROTO_IPV6) && 1749 (sopt->sopt_name == IPV6_USE_MIN_MTU)) { 1750 INP_WLOCK(inp); 1751 if ((inp->inp_flags & 1752 (INP_TIMEWAIT | INP_DROPPED))) { 1753 INP_WUNLOCK(inp); 1754 return (ECONNRESET); 1755 } 1756 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 1757 tp = intotcpcb(inp); 1758 if ((tp->t_state >= TCPS_SYN_SENT) && 1759 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 1760 struct ip6_pktopts *opt; 1761 1762 opt = inp->in6p_outputopts; 1763 if ((opt != NULL) && 1764 (opt->ip6po_minmtu == 1765 IP6PO_MINMTU_ALL)) { 1766 if (tp->t_maxseg > TCP6_MSS) { 1767 tp->t_maxseg = TCP6_MSS; 1768 } 1769 } 1770 } 1771 INP_WUNLOCK(inp); 1772 } 1773 } 1774 #endif /* INET6 */ 1775 #if defined(INET6) && defined(INET) 1776 else 1777 #endif 1778 #ifdef INET 1779 { 1780 error = ip_ctloutput(so, sopt); 1781 } 1782 #endif 1783 return (error); 1784 } 1785 INP_WLOCK(inp); 1786 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1787 INP_WUNLOCK(inp); 1788 return (ECONNRESET); 1789 } 1790 tp = intotcpcb(inp); 1791 /* 1792 * Protect the TCP option TCP_FUNCTION_BLK so 1793 * that a sub-function can *never* overwrite this. 1794 */ 1795 if ((sopt->sopt_dir == SOPT_SET) && 1796 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1797 INP_WUNLOCK(inp); 1798 error = sooptcopyin(sopt, &fsn, sizeof fsn, 1799 sizeof fsn); 1800 if (error) 1801 return (error); 1802 INP_WLOCK_RECHECK(inp); 1803 blk = find_and_ref_tcp_functions(&fsn); 1804 if (blk == NULL) { 1805 INP_WUNLOCK(inp); 1806 return (ENOENT); 1807 } 1808 if (tp->t_fb == blk) { 1809 /* You already have this */ 1810 refcount_release(&blk->tfb_refcnt); 1811 INP_WUNLOCK(inp); 1812 return (0); 1813 } 1814 if (tp->t_state != TCPS_CLOSED) { 1815 /* 1816 * The user has advanced the state 1817 * past the initial point, we may not 1818 * be able to switch. 1819 */ 1820 if (blk->tfb_tcp_handoff_ok != NULL) { 1821 /* 1822 * Does the stack provide a 1823 * query mechanism, if so it may 1824 * still be possible? 1825 */ 1826 error = (*blk->tfb_tcp_handoff_ok)(tp); 1827 } else 1828 error = EINVAL; 1829 if (error) { 1830 refcount_release(&blk->tfb_refcnt); 1831 INP_WUNLOCK(inp); 1832 return(error); 1833 } 1834 } 1835 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1836 refcount_release(&blk->tfb_refcnt); 1837 INP_WUNLOCK(inp); 1838 return (ENOENT); 1839 } 1840 /* 1841 * Release the old refcnt, the 1842 * lookup acquired a ref on the 1843 * new one already. 1844 */ 1845 if (tp->t_fb->tfb_tcp_fb_fini) { 1846 /* 1847 * Tell the stack to cleanup with 0 i.e. 1848 * the tcb is not going away. 1849 */ 1850 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1851 } 1852 #ifdef TCPHPTS 1853 /* Assure that we are not on any hpts */ 1854 tcp_hpts_remove(tp->t_inpcb, HPTS_REMOVE_ALL); 1855 #endif 1856 if (blk->tfb_tcp_fb_init) { 1857 error = (*blk->tfb_tcp_fb_init)(tp); 1858 if (error) { 1859 refcount_release(&blk->tfb_refcnt); 1860 if (tp->t_fb->tfb_tcp_fb_init) { 1861 if((*tp->t_fb->tfb_tcp_fb_init)(tp) != 0) { 1862 /* Fall back failed, drop the connection */ 1863 INP_WUNLOCK(inp); 1864 soabort(so); 1865 return(error); 1866 } 1867 } 1868 goto err_out; 1869 } 1870 } 1871 refcount_release(&tp->t_fb->tfb_refcnt); 1872 tp->t_fb = blk; 1873 #ifdef TCP_OFFLOAD 1874 if (tp->t_flags & TF_TOE) { 1875 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1876 sopt->sopt_name); 1877 } 1878 #endif 1879 err_out: 1880 INP_WUNLOCK(inp); 1881 return (error); 1882 } else if ((sopt->sopt_dir == SOPT_GET) && 1883 (sopt->sopt_name == TCP_FUNCTION_BLK)) { 1884 strncpy(fsn.function_set_name, tp->t_fb->tfb_tcp_block_name, 1885 TCP_FUNCTION_NAME_LEN_MAX); 1886 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1887 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1888 INP_WUNLOCK(inp); 1889 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1890 return (error); 1891 } 1892 /* Pass in the INP locked, called must unlock it */ 1893 return (tp->t_fb->tfb_tcp_ctloutput(so, sopt, inp, tp)); 1894 } 1895 1896 /* 1897 * If this assert becomes untrue, we need to change the size of the buf 1898 * variable in tcp_default_ctloutput(). 1899 */ 1900 #ifdef CTASSERT 1901 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1902 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1903 #endif 1904 1905 #ifdef KERN_TLS 1906 static int 1907 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1908 { 1909 struct tls_enable_v0 tls_v0; 1910 int error; 1911 1912 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1913 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1914 sizeof(tls_v0)); 1915 if (error) 1916 return (error); 1917 memset(tls, 0, sizeof(*tls)); 1918 tls->cipher_key = tls_v0.cipher_key; 1919 tls->iv = tls_v0.iv; 1920 tls->auth_key = tls_v0.auth_key; 1921 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1922 tls->cipher_key_len = tls_v0.cipher_key_len; 1923 tls->iv_len = tls_v0.iv_len; 1924 tls->auth_algorithm = tls_v0.auth_algorithm; 1925 tls->auth_key_len = tls_v0.auth_key_len; 1926 tls->flags = tls_v0.flags; 1927 tls->tls_vmajor = tls_v0.tls_vmajor; 1928 tls->tls_vminor = tls_v0.tls_vminor; 1929 return (0); 1930 } 1931 1932 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1933 } 1934 #endif 1935 1936 int 1937 tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp) 1938 { 1939 int error, opt, optval; 1940 u_int ui; 1941 struct tcp_info ti; 1942 #ifdef KERN_TLS 1943 struct tls_enable tls; 1944 #endif 1945 struct cc_algo *algo; 1946 char *pbuf, buf[TCP_LOG_ID_LEN]; 1947 #ifdef STATS 1948 struct statsblob *sbp; 1949 #endif 1950 size_t len; 1951 1952 /* 1953 * For TCP_CCALGOOPT forward the control to CC module, for both 1954 * SOPT_SET and SOPT_GET. 1955 */ 1956 switch (sopt->sopt_name) { 1957 case TCP_CCALGOOPT: 1958 INP_WUNLOCK(inp); 1959 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 1960 return (EINVAL); 1961 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 1962 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 1963 sopt->sopt_valsize); 1964 if (error) { 1965 free(pbuf, M_TEMP); 1966 return (error); 1967 } 1968 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 1969 if (CC_ALGO(tp)->ctl_output != NULL) 1970 error = CC_ALGO(tp)->ctl_output(tp->ccv, sopt, pbuf); 1971 else 1972 error = ENOENT; 1973 INP_WUNLOCK(inp); 1974 if (error == 0 && sopt->sopt_dir == SOPT_GET) 1975 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 1976 free(pbuf, M_TEMP); 1977 return (error); 1978 } 1979 1980 switch (sopt->sopt_dir) { 1981 case SOPT_SET: 1982 switch (sopt->sopt_name) { 1983 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 1984 case TCP_MD5SIG: 1985 if (!TCPMD5_ENABLED()) { 1986 INP_WUNLOCK(inp); 1987 return (ENOPROTOOPT); 1988 } 1989 error = TCPMD5_PCBCTL(inp, sopt); 1990 if (error) 1991 return (error); 1992 goto unlock_and_done; 1993 #endif /* IPSEC */ 1994 1995 case TCP_NODELAY: 1996 case TCP_NOOPT: 1997 INP_WUNLOCK(inp); 1998 error = sooptcopyin(sopt, &optval, sizeof optval, 1999 sizeof optval); 2000 if (error) 2001 return (error); 2002 2003 INP_WLOCK_RECHECK(inp); 2004 switch (sopt->sopt_name) { 2005 case TCP_NODELAY: 2006 opt = TF_NODELAY; 2007 break; 2008 case TCP_NOOPT: 2009 opt = TF_NOOPT; 2010 break; 2011 default: 2012 opt = 0; /* dead code to fool gcc */ 2013 break; 2014 } 2015 2016 if (optval) 2017 tp->t_flags |= opt; 2018 else 2019 tp->t_flags &= ~opt; 2020 unlock_and_done: 2021 #ifdef TCP_OFFLOAD 2022 if (tp->t_flags & TF_TOE) { 2023 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2024 sopt->sopt_name); 2025 } 2026 #endif 2027 INP_WUNLOCK(inp); 2028 break; 2029 2030 case TCP_NOPUSH: 2031 INP_WUNLOCK(inp); 2032 error = sooptcopyin(sopt, &optval, sizeof optval, 2033 sizeof optval); 2034 if (error) 2035 return (error); 2036 2037 INP_WLOCK_RECHECK(inp); 2038 if (optval) 2039 tp->t_flags |= TF_NOPUSH; 2040 else if (tp->t_flags & TF_NOPUSH) { 2041 tp->t_flags &= ~TF_NOPUSH; 2042 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2043 struct epoch_tracker et; 2044 2045 NET_EPOCH_ENTER(et); 2046 error = tp->t_fb->tfb_tcp_output(tp); 2047 NET_EPOCH_EXIT(et); 2048 } 2049 } 2050 goto unlock_and_done; 2051 2052 case TCP_MAXSEG: 2053 INP_WUNLOCK(inp); 2054 error = sooptcopyin(sopt, &optval, sizeof optval, 2055 sizeof optval); 2056 if (error) 2057 return (error); 2058 2059 INP_WLOCK_RECHECK(inp); 2060 if (optval > 0 && optval <= tp->t_maxseg && 2061 optval + 40 >= V_tcp_minmss) 2062 tp->t_maxseg = optval; 2063 else 2064 error = EINVAL; 2065 goto unlock_and_done; 2066 2067 case TCP_INFO: 2068 INP_WUNLOCK(inp); 2069 error = EINVAL; 2070 break; 2071 2072 case TCP_STATS: 2073 INP_WUNLOCK(inp); 2074 #ifdef STATS 2075 error = sooptcopyin(sopt, &optval, sizeof optval, 2076 sizeof optval); 2077 if (error) 2078 return (error); 2079 2080 if (optval > 0) 2081 sbp = stats_blob_alloc( 2082 V_tcp_perconn_stats_dflt_tpl, 0); 2083 else 2084 sbp = NULL; 2085 2086 INP_WLOCK_RECHECK(inp); 2087 if ((tp->t_stats != NULL && sbp == NULL) || 2088 (tp->t_stats == NULL && sbp != NULL)) { 2089 struct statsblob *t = tp->t_stats; 2090 tp->t_stats = sbp; 2091 sbp = t; 2092 } 2093 INP_WUNLOCK(inp); 2094 2095 stats_blob_destroy(sbp); 2096 #else 2097 return (EOPNOTSUPP); 2098 #endif /* !STATS */ 2099 break; 2100 2101 case TCP_CONGESTION: 2102 INP_WUNLOCK(inp); 2103 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 2104 if (error) 2105 break; 2106 buf[sopt->sopt_valsize] = '\0'; 2107 INP_WLOCK_RECHECK(inp); 2108 CC_LIST_RLOCK(); 2109 STAILQ_FOREACH(algo, &cc_list, entries) 2110 if (strncmp(buf, algo->name, 2111 TCP_CA_NAME_MAX) == 0) 2112 break; 2113 CC_LIST_RUNLOCK(); 2114 if (algo == NULL) { 2115 INP_WUNLOCK(inp); 2116 error = EINVAL; 2117 break; 2118 } 2119 /* 2120 * We hold a write lock over the tcb so it's safe to 2121 * do these things without ordering concerns. 2122 */ 2123 if (CC_ALGO(tp)->cb_destroy != NULL) 2124 CC_ALGO(tp)->cb_destroy(tp->ccv); 2125 CC_DATA(tp) = NULL; 2126 CC_ALGO(tp) = algo; 2127 /* 2128 * If something goes pear shaped initialising the new 2129 * algo, fall back to newreno (which does not 2130 * require initialisation). 2131 */ 2132 if (algo->cb_init != NULL && 2133 algo->cb_init(tp->ccv) != 0) { 2134 CC_ALGO(tp) = &newreno_cc_algo; 2135 /* 2136 * The only reason init should fail is 2137 * because of malloc. 2138 */ 2139 error = ENOMEM; 2140 } 2141 INP_WUNLOCK(inp); 2142 break; 2143 2144 case TCP_REUSPORT_LB_NUMA: 2145 INP_WUNLOCK(inp); 2146 error = sooptcopyin(sopt, &optval, sizeof(optval), 2147 sizeof(optval)); 2148 INP_WLOCK_RECHECK(inp); 2149 if (!error) 2150 error = in_pcblbgroup_numa(inp, optval); 2151 INP_WUNLOCK(inp); 2152 break; 2153 2154 #ifdef KERN_TLS 2155 case TCP_TXTLS_ENABLE: 2156 INP_WUNLOCK(inp); 2157 error = copyin_tls_enable(sopt, &tls); 2158 if (error) 2159 break; 2160 error = ktls_enable_tx(so, &tls); 2161 break; 2162 case TCP_TXTLS_MODE: 2163 INP_WUNLOCK(inp); 2164 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2165 if (error) 2166 return (error); 2167 2168 INP_WLOCK_RECHECK(inp); 2169 error = ktls_set_tx_mode(so, ui); 2170 INP_WUNLOCK(inp); 2171 break; 2172 case TCP_RXTLS_ENABLE: 2173 INP_WUNLOCK(inp); 2174 error = sooptcopyin(sopt, &tls, sizeof(tls), 2175 sizeof(tls)); 2176 if (error) 2177 break; 2178 error = ktls_enable_rx(so, &tls); 2179 break; 2180 #endif 2181 2182 case TCP_KEEPIDLE: 2183 case TCP_KEEPINTVL: 2184 case TCP_KEEPINIT: 2185 INP_WUNLOCK(inp); 2186 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2187 if (error) 2188 return (error); 2189 2190 if (ui > (UINT_MAX / hz)) { 2191 error = EINVAL; 2192 break; 2193 } 2194 ui *= hz; 2195 2196 INP_WLOCK_RECHECK(inp); 2197 switch (sopt->sopt_name) { 2198 case TCP_KEEPIDLE: 2199 tp->t_keepidle = ui; 2200 /* 2201 * XXX: better check current remaining 2202 * timeout and "merge" it with new value. 2203 */ 2204 if ((tp->t_state > TCPS_LISTEN) && 2205 (tp->t_state <= TCPS_CLOSING)) 2206 tcp_timer_activate(tp, TT_KEEP, 2207 TP_KEEPIDLE(tp)); 2208 break; 2209 case TCP_KEEPINTVL: 2210 tp->t_keepintvl = ui; 2211 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2212 (TP_MAXIDLE(tp) > 0)) 2213 tcp_timer_activate(tp, TT_2MSL, 2214 TP_MAXIDLE(tp)); 2215 break; 2216 case TCP_KEEPINIT: 2217 tp->t_keepinit = ui; 2218 if (tp->t_state == TCPS_SYN_RECEIVED || 2219 tp->t_state == TCPS_SYN_SENT) 2220 tcp_timer_activate(tp, TT_KEEP, 2221 TP_KEEPINIT(tp)); 2222 break; 2223 } 2224 goto unlock_and_done; 2225 2226 case TCP_KEEPCNT: 2227 INP_WUNLOCK(inp); 2228 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2229 if (error) 2230 return (error); 2231 2232 INP_WLOCK_RECHECK(inp); 2233 tp->t_keepcnt = ui; 2234 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2235 (TP_MAXIDLE(tp) > 0)) 2236 tcp_timer_activate(tp, TT_2MSL, 2237 TP_MAXIDLE(tp)); 2238 goto unlock_and_done; 2239 2240 #ifdef TCPPCAP 2241 case TCP_PCAP_OUT: 2242 case TCP_PCAP_IN: 2243 INP_WUNLOCK(inp); 2244 error = sooptcopyin(sopt, &optval, sizeof optval, 2245 sizeof optval); 2246 if (error) 2247 return (error); 2248 2249 INP_WLOCK_RECHECK(inp); 2250 if (optval >= 0) 2251 tcp_pcap_set_sock_max(TCP_PCAP_OUT ? 2252 &(tp->t_outpkts) : &(tp->t_inpkts), 2253 optval); 2254 else 2255 error = EINVAL; 2256 goto unlock_and_done; 2257 #endif 2258 2259 case TCP_FASTOPEN: { 2260 struct tcp_fastopen tfo_optval; 2261 2262 INP_WUNLOCK(inp); 2263 if (!V_tcp_fastopen_client_enable && 2264 !V_tcp_fastopen_server_enable) 2265 return (EPERM); 2266 2267 error = sooptcopyin(sopt, &tfo_optval, 2268 sizeof(tfo_optval), sizeof(int)); 2269 if (error) 2270 return (error); 2271 2272 INP_WLOCK_RECHECK(inp); 2273 if ((tp->t_state != TCPS_CLOSED) && 2274 (tp->t_state != TCPS_LISTEN)) { 2275 error = EINVAL; 2276 goto unlock_and_done; 2277 } 2278 if (tfo_optval.enable) { 2279 if (tp->t_state == TCPS_LISTEN) { 2280 if (!V_tcp_fastopen_server_enable) { 2281 error = EPERM; 2282 goto unlock_and_done; 2283 } 2284 2285 if (tp->t_tfo_pending == NULL) 2286 tp->t_tfo_pending = 2287 tcp_fastopen_alloc_counter(); 2288 } else { 2289 /* 2290 * If a pre-shared key was provided, 2291 * stash it in the client cookie 2292 * field of the tcpcb for use during 2293 * connect. 2294 */ 2295 if (sopt->sopt_valsize == 2296 sizeof(tfo_optval)) { 2297 memcpy(tp->t_tfo_cookie.client, 2298 tfo_optval.psk, 2299 TCP_FASTOPEN_PSK_LEN); 2300 tp->t_tfo_client_cookie_len = 2301 TCP_FASTOPEN_PSK_LEN; 2302 } 2303 } 2304 tp->t_flags |= TF_FASTOPEN; 2305 } else 2306 tp->t_flags &= ~TF_FASTOPEN; 2307 goto unlock_and_done; 2308 } 2309 2310 #ifdef TCP_BLACKBOX 2311 case TCP_LOG: 2312 INP_WUNLOCK(inp); 2313 error = sooptcopyin(sopt, &optval, sizeof optval, 2314 sizeof optval); 2315 if (error) 2316 return (error); 2317 2318 INP_WLOCK_RECHECK(inp); 2319 error = tcp_log_state_change(tp, optval); 2320 goto unlock_and_done; 2321 2322 case TCP_LOGBUF: 2323 INP_WUNLOCK(inp); 2324 error = EINVAL; 2325 break; 2326 2327 case TCP_LOGID: 2328 INP_WUNLOCK(inp); 2329 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2330 if (error) 2331 break; 2332 buf[sopt->sopt_valsize] = '\0'; 2333 INP_WLOCK_RECHECK(inp); 2334 error = tcp_log_set_id(tp, buf); 2335 /* tcp_log_set_id() unlocks the INP. */ 2336 break; 2337 2338 case TCP_LOGDUMP: 2339 case TCP_LOGDUMPID: 2340 INP_WUNLOCK(inp); 2341 error = 2342 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2343 if (error) 2344 break; 2345 buf[sopt->sopt_valsize] = '\0'; 2346 INP_WLOCK_RECHECK(inp); 2347 if (sopt->sopt_name == TCP_LOGDUMP) { 2348 error = tcp_log_dump_tp_logbuf(tp, buf, 2349 M_WAITOK, true); 2350 INP_WUNLOCK(inp); 2351 } else { 2352 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2353 /* 2354 * tcp_log_dump_tp_bucket_logbufs() drops the 2355 * INP lock. 2356 */ 2357 } 2358 break; 2359 #endif 2360 2361 default: 2362 INP_WUNLOCK(inp); 2363 error = ENOPROTOOPT; 2364 break; 2365 } 2366 break; 2367 2368 case SOPT_GET: 2369 tp = intotcpcb(inp); 2370 switch (sopt->sopt_name) { 2371 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2372 case TCP_MD5SIG: 2373 if (!TCPMD5_ENABLED()) { 2374 INP_WUNLOCK(inp); 2375 return (ENOPROTOOPT); 2376 } 2377 error = TCPMD5_PCBCTL(inp, sopt); 2378 break; 2379 #endif 2380 2381 case TCP_NODELAY: 2382 optval = tp->t_flags & TF_NODELAY; 2383 INP_WUNLOCK(inp); 2384 error = sooptcopyout(sopt, &optval, sizeof optval); 2385 break; 2386 case TCP_MAXSEG: 2387 optval = tp->t_maxseg; 2388 INP_WUNLOCK(inp); 2389 error = sooptcopyout(sopt, &optval, sizeof optval); 2390 break; 2391 case TCP_NOOPT: 2392 optval = tp->t_flags & TF_NOOPT; 2393 INP_WUNLOCK(inp); 2394 error = sooptcopyout(sopt, &optval, sizeof optval); 2395 break; 2396 case TCP_NOPUSH: 2397 optval = tp->t_flags & TF_NOPUSH; 2398 INP_WUNLOCK(inp); 2399 error = sooptcopyout(sopt, &optval, sizeof optval); 2400 break; 2401 case TCP_INFO: 2402 tcp_fill_info(tp, &ti); 2403 INP_WUNLOCK(inp); 2404 error = sooptcopyout(sopt, &ti, sizeof ti); 2405 break; 2406 case TCP_STATS: 2407 { 2408 #ifdef STATS 2409 int nheld; 2410 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2411 2412 error = 0; 2413 socklen_t outsbsz = sopt->sopt_valsize; 2414 if (tp->t_stats == NULL) 2415 error = ENOENT; 2416 else if (outsbsz >= tp->t_stats->cursz) 2417 outsbsz = tp->t_stats->cursz; 2418 else if (outsbsz >= sizeof(struct statsblob)) 2419 outsbsz = sizeof(struct statsblob); 2420 else 2421 error = EINVAL; 2422 INP_WUNLOCK(inp); 2423 if (error) 2424 break; 2425 2426 sbp = sopt->sopt_val; 2427 nheld = atop(round_page(((vm_offset_t)sbp) + 2428 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2429 vm_page_t ma[nheld]; 2430 if (vm_fault_quick_hold_pages( 2431 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2432 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2433 nheld) < 0) { 2434 error = EFAULT; 2435 break; 2436 } 2437 2438 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2439 SIZEOF_MEMBER(struct statsblob, flags)))) 2440 goto unhold; 2441 2442 INP_WLOCK_RECHECK(inp); 2443 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2444 sbflags | SB_CLONE_USRDSTNOFAULT); 2445 INP_WUNLOCK(inp); 2446 sopt->sopt_valsize = outsbsz; 2447 unhold: 2448 vm_page_unhold_pages(ma, nheld); 2449 #else 2450 INP_WUNLOCK(inp); 2451 error = EOPNOTSUPP; 2452 #endif /* !STATS */ 2453 break; 2454 } 2455 case TCP_CONGESTION: 2456 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2457 INP_WUNLOCK(inp); 2458 error = sooptcopyout(sopt, buf, len + 1); 2459 break; 2460 case TCP_KEEPIDLE: 2461 case TCP_KEEPINTVL: 2462 case TCP_KEEPINIT: 2463 case TCP_KEEPCNT: 2464 switch (sopt->sopt_name) { 2465 case TCP_KEEPIDLE: 2466 ui = TP_KEEPIDLE(tp) / hz; 2467 break; 2468 case TCP_KEEPINTVL: 2469 ui = TP_KEEPINTVL(tp) / hz; 2470 break; 2471 case TCP_KEEPINIT: 2472 ui = TP_KEEPINIT(tp) / hz; 2473 break; 2474 case TCP_KEEPCNT: 2475 ui = TP_KEEPCNT(tp); 2476 break; 2477 } 2478 INP_WUNLOCK(inp); 2479 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2480 break; 2481 #ifdef TCPPCAP 2482 case TCP_PCAP_OUT: 2483 case TCP_PCAP_IN: 2484 optval = tcp_pcap_get_sock_max(TCP_PCAP_OUT ? 2485 &(tp->t_outpkts) : &(tp->t_inpkts)); 2486 INP_WUNLOCK(inp); 2487 error = sooptcopyout(sopt, &optval, sizeof optval); 2488 break; 2489 #endif 2490 case TCP_FASTOPEN: 2491 optval = tp->t_flags & TF_FASTOPEN; 2492 INP_WUNLOCK(inp); 2493 error = sooptcopyout(sopt, &optval, sizeof optval); 2494 break; 2495 #ifdef TCP_BLACKBOX 2496 case TCP_LOG: 2497 optval = tp->t_logstate; 2498 INP_WUNLOCK(inp); 2499 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2500 break; 2501 case TCP_LOGBUF: 2502 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2503 error = tcp_log_getlogbuf(sopt, tp); 2504 break; 2505 case TCP_LOGID: 2506 len = tcp_log_get_id(tp, buf); 2507 INP_WUNLOCK(inp); 2508 error = sooptcopyout(sopt, buf, len + 1); 2509 break; 2510 case TCP_LOGDUMP: 2511 case TCP_LOGDUMPID: 2512 INP_WUNLOCK(inp); 2513 error = EINVAL; 2514 break; 2515 #endif 2516 #ifdef KERN_TLS 2517 case TCP_TXTLS_MODE: 2518 optval = ktls_get_tx_mode(so); 2519 INP_WUNLOCK(inp); 2520 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2521 break; 2522 case TCP_RXTLS_MODE: 2523 optval = ktls_get_rx_mode(so); 2524 INP_WUNLOCK(inp); 2525 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2526 break; 2527 #endif 2528 default: 2529 INP_WUNLOCK(inp); 2530 error = ENOPROTOOPT; 2531 break; 2532 } 2533 break; 2534 } 2535 return (error); 2536 } 2537 #undef INP_WLOCK_RECHECK 2538 #undef INP_WLOCK_RECHECK_CLEANUP 2539 2540 /* 2541 * Initiate (or continue) disconnect. 2542 * If embryonic state, just send reset (once). 2543 * If in ``let data drain'' option and linger null, just drop. 2544 * Otherwise (hard), mark socket disconnecting and drop 2545 * current input data; switch states based on user close, and 2546 * send segment to peer (with FIN). 2547 */ 2548 static void 2549 tcp_disconnect(struct tcpcb *tp) 2550 { 2551 struct inpcb *inp = tp->t_inpcb; 2552 struct socket *so = inp->inp_socket; 2553 2554 NET_EPOCH_ASSERT(); 2555 INP_WLOCK_ASSERT(inp); 2556 2557 /* 2558 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2559 * socket is still open. 2560 */ 2561 if (tp->t_state < TCPS_ESTABLISHED && 2562 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2563 tp = tcp_close(tp); 2564 KASSERT(tp != NULL, 2565 ("tcp_disconnect: tcp_close() returned NULL")); 2566 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2567 tp = tcp_drop(tp, 0); 2568 KASSERT(tp != NULL, 2569 ("tcp_disconnect: tcp_drop() returned NULL")); 2570 } else { 2571 soisdisconnecting(so); 2572 sbflush(&so->so_rcv); 2573 tcp_usrclosed(tp); 2574 if (!(inp->inp_flags & INP_DROPPED)) 2575 tp->t_fb->tfb_tcp_output(tp); 2576 } 2577 } 2578 2579 /* 2580 * User issued close, and wish to trail through shutdown states: 2581 * if never received SYN, just forget it. If got a SYN from peer, 2582 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2583 * If already got a FIN from peer, then almost done; go to LAST_ACK 2584 * state. In all other cases, have already sent FIN to peer (e.g. 2585 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2586 * for peer to send FIN or not respond to keep-alives, etc. 2587 * We can let the user exit from the close as soon as the FIN is acked. 2588 */ 2589 static void 2590 tcp_usrclosed(struct tcpcb *tp) 2591 { 2592 2593 NET_EPOCH_ASSERT(); 2594 INP_WLOCK_ASSERT(tp->t_inpcb); 2595 2596 switch (tp->t_state) { 2597 case TCPS_LISTEN: 2598 #ifdef TCP_OFFLOAD 2599 tcp_offload_listen_stop(tp); 2600 #endif 2601 tcp_state_change(tp, TCPS_CLOSED); 2602 /* FALLTHROUGH */ 2603 case TCPS_CLOSED: 2604 tp = tcp_close(tp); 2605 /* 2606 * tcp_close() should never return NULL here as the socket is 2607 * still open. 2608 */ 2609 KASSERT(tp != NULL, 2610 ("tcp_usrclosed: tcp_close() returned NULL")); 2611 break; 2612 2613 case TCPS_SYN_SENT: 2614 case TCPS_SYN_RECEIVED: 2615 tp->t_flags |= TF_NEEDFIN; 2616 break; 2617 2618 case TCPS_ESTABLISHED: 2619 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2620 break; 2621 2622 case TCPS_CLOSE_WAIT: 2623 tcp_state_change(tp, TCPS_LAST_ACK); 2624 break; 2625 } 2626 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2627 soisdisconnected(tp->t_inpcb->inp_socket); 2628 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2629 if (tp->t_state == TCPS_FIN_WAIT_2) { 2630 int timeout; 2631 2632 timeout = (tcp_fast_finwait2_recycle) ? 2633 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2634 tcp_timer_activate(tp, TT_2MSL, timeout); 2635 } 2636 } 2637 } 2638 2639 #ifdef DDB 2640 static void 2641 db_print_indent(int indent) 2642 { 2643 int i; 2644 2645 for (i = 0; i < indent; i++) 2646 db_printf(" "); 2647 } 2648 2649 static void 2650 db_print_tstate(int t_state) 2651 { 2652 2653 switch (t_state) { 2654 case TCPS_CLOSED: 2655 db_printf("TCPS_CLOSED"); 2656 return; 2657 2658 case TCPS_LISTEN: 2659 db_printf("TCPS_LISTEN"); 2660 return; 2661 2662 case TCPS_SYN_SENT: 2663 db_printf("TCPS_SYN_SENT"); 2664 return; 2665 2666 case TCPS_SYN_RECEIVED: 2667 db_printf("TCPS_SYN_RECEIVED"); 2668 return; 2669 2670 case TCPS_ESTABLISHED: 2671 db_printf("TCPS_ESTABLISHED"); 2672 return; 2673 2674 case TCPS_CLOSE_WAIT: 2675 db_printf("TCPS_CLOSE_WAIT"); 2676 return; 2677 2678 case TCPS_FIN_WAIT_1: 2679 db_printf("TCPS_FIN_WAIT_1"); 2680 return; 2681 2682 case TCPS_CLOSING: 2683 db_printf("TCPS_CLOSING"); 2684 return; 2685 2686 case TCPS_LAST_ACK: 2687 db_printf("TCPS_LAST_ACK"); 2688 return; 2689 2690 case TCPS_FIN_WAIT_2: 2691 db_printf("TCPS_FIN_WAIT_2"); 2692 return; 2693 2694 case TCPS_TIME_WAIT: 2695 db_printf("TCPS_TIME_WAIT"); 2696 return; 2697 2698 default: 2699 db_printf("unknown"); 2700 return; 2701 } 2702 } 2703 2704 static void 2705 db_print_tflags(u_int t_flags) 2706 { 2707 int comma; 2708 2709 comma = 0; 2710 if (t_flags & TF_ACKNOW) { 2711 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2712 comma = 1; 2713 } 2714 if (t_flags & TF_DELACK) { 2715 db_printf("%sTF_DELACK", comma ? ", " : ""); 2716 comma = 1; 2717 } 2718 if (t_flags & TF_NODELAY) { 2719 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2720 comma = 1; 2721 } 2722 if (t_flags & TF_NOOPT) { 2723 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2724 comma = 1; 2725 } 2726 if (t_flags & TF_SENTFIN) { 2727 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2728 comma = 1; 2729 } 2730 if (t_flags & TF_REQ_SCALE) { 2731 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2732 comma = 1; 2733 } 2734 if (t_flags & TF_RCVD_SCALE) { 2735 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2736 comma = 1; 2737 } 2738 if (t_flags & TF_REQ_TSTMP) { 2739 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2740 comma = 1; 2741 } 2742 if (t_flags & TF_RCVD_TSTMP) { 2743 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2744 comma = 1; 2745 } 2746 if (t_flags & TF_SACK_PERMIT) { 2747 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2748 comma = 1; 2749 } 2750 if (t_flags & TF_NEEDSYN) { 2751 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2752 comma = 1; 2753 } 2754 if (t_flags & TF_NEEDFIN) { 2755 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2756 comma = 1; 2757 } 2758 if (t_flags & TF_NOPUSH) { 2759 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2760 comma = 1; 2761 } 2762 if (t_flags & TF_MORETOCOME) { 2763 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2764 comma = 1; 2765 } 2766 if (t_flags & TF_LQ_OVERFLOW) { 2767 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 2768 comma = 1; 2769 } 2770 if (t_flags & TF_LASTIDLE) { 2771 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2772 comma = 1; 2773 } 2774 if (t_flags & TF_RXWIN0SENT) { 2775 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2776 comma = 1; 2777 } 2778 if (t_flags & TF_FASTRECOVERY) { 2779 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2780 comma = 1; 2781 } 2782 if (t_flags & TF_CONGRECOVERY) { 2783 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2784 comma = 1; 2785 } 2786 if (t_flags & TF_WASFRECOVERY) { 2787 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2788 comma = 1; 2789 } 2790 if (t_flags & TF_SIGNATURE) { 2791 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2792 comma = 1; 2793 } 2794 if (t_flags & TF_FORCEDATA) { 2795 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2796 comma = 1; 2797 } 2798 if (t_flags & TF_TSO) { 2799 db_printf("%sTF_TSO", comma ? ", " : ""); 2800 comma = 1; 2801 } 2802 if (t_flags & TF_FASTOPEN) { 2803 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2804 comma = 1; 2805 } 2806 } 2807 2808 static void 2809 db_print_tflags2(u_int t_flags2) 2810 { 2811 int comma; 2812 2813 comma = 0; 2814 if (t_flags2 & TF2_ECN_PERMIT) { 2815 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2816 comma = 1; 2817 } 2818 } 2819 2820 static void 2821 db_print_toobflags(char t_oobflags) 2822 { 2823 int comma; 2824 2825 comma = 0; 2826 if (t_oobflags & TCPOOB_HAVEDATA) { 2827 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2828 comma = 1; 2829 } 2830 if (t_oobflags & TCPOOB_HADDATA) { 2831 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2832 comma = 1; 2833 } 2834 } 2835 2836 static void 2837 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2838 { 2839 2840 db_print_indent(indent); 2841 db_printf("%s at %p\n", name, tp); 2842 2843 indent += 2; 2844 2845 db_print_indent(indent); 2846 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2847 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2848 2849 db_print_indent(indent); 2850 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2851 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2852 2853 db_print_indent(indent); 2854 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2855 &tp->t_timers->tt_delack, tp->t_inpcb); 2856 2857 db_print_indent(indent); 2858 db_printf("t_state: %d (", tp->t_state); 2859 db_print_tstate(tp->t_state); 2860 db_printf(")\n"); 2861 2862 db_print_indent(indent); 2863 db_printf("t_flags: 0x%x (", tp->t_flags); 2864 db_print_tflags(tp->t_flags); 2865 db_printf(")\n"); 2866 2867 db_print_indent(indent); 2868 db_printf("t_flags2: 0x%x (", tp->t_flags2); 2869 db_print_tflags2(tp->t_flags2); 2870 db_printf(")\n"); 2871 2872 db_print_indent(indent); 2873 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2874 tp->snd_una, tp->snd_max, tp->snd_nxt); 2875 2876 db_print_indent(indent); 2877 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2878 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2879 2880 db_print_indent(indent); 2881 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2882 tp->iss, tp->irs, tp->rcv_nxt); 2883 2884 db_print_indent(indent); 2885 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2886 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2887 2888 db_print_indent(indent); 2889 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2890 tp->snd_wnd, tp->snd_cwnd); 2891 2892 db_print_indent(indent); 2893 db_printf("snd_ssthresh: %u snd_recover: " 2894 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2895 2896 db_print_indent(indent); 2897 db_printf("t_rcvtime: %u t_startime: %u\n", 2898 tp->t_rcvtime, tp->t_starttime); 2899 2900 db_print_indent(indent); 2901 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2902 tp->t_rtttime, tp->t_rtseq); 2903 2904 db_print_indent(indent); 2905 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2906 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2907 2908 db_print_indent(indent); 2909 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2910 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2911 tp->t_rttbest); 2912 2913 db_print_indent(indent); 2914 db_printf("t_rttupdated: %lu max_sndwnd: %u t_softerror: %d\n", 2915 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2916 2917 db_print_indent(indent); 2918 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2919 db_print_toobflags(tp->t_oobflags); 2920 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2921 2922 db_print_indent(indent); 2923 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2924 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2925 2926 db_print_indent(indent); 2927 db_printf("ts_recent: %u ts_recent_age: %u\n", 2928 tp->ts_recent, tp->ts_recent_age); 2929 2930 db_print_indent(indent); 2931 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2932 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2933 2934 db_print_indent(indent); 2935 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2936 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2937 tp->snd_recover_prev, tp->t_badrxtwin); 2938 2939 db_print_indent(indent); 2940 db_printf("snd_numholes: %d snd_holes first: %p\n", 2941 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2942 2943 db_print_indent(indent); 2944 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2945 tp->snd_fack, tp->rcv_numsacks); 2946 2947 /* Skip sackblks, sackhint. */ 2948 2949 db_print_indent(indent); 2950 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2951 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2952 } 2953 2954 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2955 { 2956 struct tcpcb *tp; 2957 2958 if (!have_addr) { 2959 db_printf("usage: show tcpcb <addr>\n"); 2960 return; 2961 } 2962 tp = (struct tcpcb *)addr; 2963 2964 db_print_tcpcb(tp, "tcpcb", 0); 2965 } 2966 #endif 2967