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 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/arb.h> 52 #include <sys/limits.h> 53 #include <sys/malloc.h> 54 #include <sys/refcount.h> 55 #include <sys/kernel.h> 56 #include <sys/ktls.h> 57 #include <sys/qmath.h> 58 #include <sys/sysctl.h> 59 #include <sys/mbuf.h> 60 #ifdef INET6 61 #include <sys/domain.h> 62 #endif /* INET6 */ 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/protosw.h> 66 #include <sys/proc.h> 67 #include <sys/jail.h> 68 #include <sys/stats.h> 69 70 #ifdef DDB 71 #include <ddb/ddb.h> 72 #endif 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/route.h> 77 #include <net/vnet.h> 78 79 #include <netinet/in.h> 80 #include <netinet/in_kdtrace.h> 81 #include <netinet/in_pcb.h> 82 #include <netinet/in_systm.h> 83 #include <netinet/in_var.h> 84 #include <netinet/ip.h> 85 #include <netinet/ip_var.h> 86 #ifdef INET6 87 #include <netinet/ip6.h> 88 #include <netinet6/in6_pcb.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet6/scope6_var.h> 91 #endif 92 #include <netinet/tcp.h> 93 #include <netinet/tcp_fsm.h> 94 #include <netinet/tcp_seq.h> 95 #include <netinet/tcp_timer.h> 96 #include <netinet/tcp_var.h> 97 #include <netinet/tcp_log_buf.h> 98 #include <netinet/tcpip.h> 99 #include <netinet/cc/cc.h> 100 #include <netinet/tcp_fastopen.h> 101 #include <netinet/tcp_hpts.h> 102 #ifdef TCPPCAP 103 #include <netinet/tcp_pcap.h> 104 #endif 105 #ifdef TCP_OFFLOAD 106 #include <netinet/tcp_offload.h> 107 #endif 108 #include <netipsec/ipsec_support.h> 109 110 #include <vm/vm.h> 111 #include <vm/vm_param.h> 112 #include <vm/pmap.h> 113 #include <vm/vm_extern.h> 114 #include <vm/vm_map.h> 115 #include <vm/vm_page.h> 116 117 /* 118 * TCP protocol interface to socket abstraction. 119 */ 120 #ifdef INET 121 static int tcp_connect(struct tcpcb *, struct sockaddr_in *, 122 struct thread *td); 123 #endif /* INET */ 124 #ifdef INET6 125 static int tcp6_connect(struct tcpcb *, struct sockaddr_in6 *, 126 struct thread *td); 127 #endif /* INET6 */ 128 static void tcp_disconnect(struct tcpcb *); 129 static void tcp_usrclosed(struct tcpcb *); 130 static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 131 132 static int tcp_pru_options_support(struct tcpcb *tp, int flags); 133 134 static void 135 tcp_bblog_pru(struct tcpcb *tp, uint32_t pru, int error) 136 { 137 struct tcp_log_buffer *lgb; 138 139 KASSERT(tp != NULL, ("tcp_bblog_pru: tp == NULL")); 140 INP_WLOCK_ASSERT(tptoinpcb(tp)); 141 if (tcp_bblogging_on(tp)) { 142 lgb = tcp_log_event(tp, NULL, NULL, NULL, TCP_LOG_PRU, error, 143 0, NULL, false, NULL, NULL, 0, NULL); 144 } else { 145 lgb = NULL; 146 } 147 if (lgb != NULL) { 148 if (error >= 0) { 149 lgb->tlb_errno = (uint32_t)error; 150 } 151 lgb->tlb_flex1 = pru; 152 } 153 } 154 155 /* 156 * TCP attaches to socket via pru_attach(), reserving space, 157 * and an internet control block. 158 */ 159 static int 160 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 161 { 162 struct inpcb *inp; 163 struct tcpcb *tp = NULL; 164 int error; 165 166 inp = sotoinpcb(so); 167 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 168 169 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 170 if (error) 171 goto out; 172 173 so->so_rcv.sb_flags |= SB_AUTOSIZE; 174 so->so_snd.sb_flags |= SB_AUTOSIZE; 175 error = in_pcballoc(so, &V_tcbinfo); 176 if (error) 177 goto out; 178 inp = sotoinpcb(so); 179 tp = tcp_newtcpcb(inp); 180 if (tp == NULL) { 181 error = ENOBUFS; 182 in_pcbdetach(inp); 183 in_pcbfree(inp); 184 goto out; 185 } 186 tp->t_state = TCPS_CLOSED; 187 tcp_bblog_pru(tp, PRU_ATTACH, error); 188 INP_WUNLOCK(inp); 189 TCPSTATES_INC(TCPS_CLOSED); 190 out: 191 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 192 return (error); 193 } 194 195 /* 196 * tcp_usr_detach is called when the socket layer loses its final reference 197 * to the socket, be it a file descriptor reference, a reference from TCP, 198 * etc. At this point, there is only one case in which we will keep around 199 * inpcb state: time wait. 200 */ 201 static void 202 tcp_usr_detach(struct socket *so) 203 { 204 struct inpcb *inp; 205 struct tcpcb *tp; 206 207 inp = sotoinpcb(so); 208 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 209 INP_WLOCK(inp); 210 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 211 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 212 213 tp = intotcpcb(inp); 214 215 KASSERT(inp->inp_flags & INP_DROPPED || 216 tp->t_state < TCPS_SYN_SENT, 217 ("%s: inp %p not dropped or embryonic", __func__, inp)); 218 219 tcp_discardcb(tp); 220 in_pcbdetach(inp); 221 in_pcbfree(inp); 222 } 223 224 #ifdef INET 225 /* 226 * Give the socket an address. 227 */ 228 static int 229 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 230 { 231 int error = 0; 232 struct inpcb *inp; 233 struct tcpcb *tp; 234 struct sockaddr_in *sinp; 235 236 inp = sotoinpcb(so); 237 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 238 INP_WLOCK(inp); 239 if (inp->inp_flags & INP_DROPPED) { 240 INP_WUNLOCK(inp); 241 return (EINVAL); 242 } 243 tp = intotcpcb(inp); 244 245 sinp = (struct sockaddr_in *)nam; 246 if (nam->sa_family != AF_INET) { 247 /* 248 * Preserve compatibility with old programs. 249 */ 250 if (nam->sa_family != AF_UNSPEC || 251 nam->sa_len < offsetof(struct sockaddr_in, sin_zero) || 252 sinp->sin_addr.s_addr != INADDR_ANY) { 253 error = EAFNOSUPPORT; 254 goto out; 255 } 256 nam->sa_family = AF_INET; 257 } 258 if (nam->sa_len != sizeof(*sinp)) { 259 error = EINVAL; 260 goto out; 261 } 262 /* 263 * Must check for multicast addresses and disallow binding 264 * to them. 265 */ 266 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 267 error = EAFNOSUPPORT; 268 goto out; 269 } 270 INP_HASH_WLOCK(&V_tcbinfo); 271 error = in_pcbbind(inp, sinp, td->td_ucred); 272 INP_HASH_WUNLOCK(&V_tcbinfo); 273 out: 274 tcp_bblog_pru(tp, PRU_BIND, error); 275 TCP_PROBE2(debug__user, tp, PRU_BIND); 276 INP_WUNLOCK(inp); 277 278 return (error); 279 } 280 #endif /* INET */ 281 282 #ifdef INET6 283 static int 284 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 285 { 286 int error = 0; 287 struct inpcb *inp; 288 struct tcpcb *tp; 289 struct sockaddr_in6 *sin6; 290 u_char vflagsav; 291 292 inp = sotoinpcb(so); 293 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 294 INP_WLOCK(inp); 295 if (inp->inp_flags & INP_DROPPED) { 296 INP_WUNLOCK(inp); 297 return (EINVAL); 298 } 299 tp = intotcpcb(inp); 300 301 vflagsav = inp->inp_vflag; 302 303 sin6 = (struct sockaddr_in6 *)nam; 304 if (nam->sa_family != AF_INET6) { 305 error = EAFNOSUPPORT; 306 goto out; 307 } 308 if (nam->sa_len != sizeof(*sin6)) { 309 error = EINVAL; 310 goto out; 311 } 312 /* 313 * Must check for multicast addresses and disallow binding 314 * to them. 315 */ 316 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 317 error = EAFNOSUPPORT; 318 goto out; 319 } 320 321 INP_HASH_WLOCK(&V_tcbinfo); 322 inp->inp_vflag &= ~INP_IPV4; 323 inp->inp_vflag |= INP_IPV6; 324 #ifdef INET 325 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 326 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 327 inp->inp_vflag |= INP_IPV4; 328 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 329 struct sockaddr_in sin; 330 331 in6_sin6_2_sin(&sin, sin6); 332 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 333 error = EAFNOSUPPORT; 334 INP_HASH_WUNLOCK(&V_tcbinfo); 335 goto out; 336 } 337 inp->inp_vflag |= INP_IPV4; 338 inp->inp_vflag &= ~INP_IPV6; 339 error = in_pcbbind(inp, &sin, td->td_ucred); 340 INP_HASH_WUNLOCK(&V_tcbinfo); 341 goto out; 342 } 343 } 344 #endif 345 error = in6_pcbbind(inp, sin6, td->td_ucred); 346 INP_HASH_WUNLOCK(&V_tcbinfo); 347 out: 348 if (error != 0) 349 inp->inp_vflag = vflagsav; 350 tcp_bblog_pru(tp, PRU_BIND, error); 351 TCP_PROBE2(debug__user, tp, PRU_BIND); 352 INP_WUNLOCK(inp); 353 return (error); 354 } 355 #endif /* INET6 */ 356 357 #ifdef INET 358 /* 359 * Prepare to accept connections. 360 */ 361 static int 362 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 363 { 364 int error = 0; 365 struct inpcb *inp; 366 struct tcpcb *tp; 367 368 inp = sotoinpcb(so); 369 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 370 INP_WLOCK(inp); 371 if (inp->inp_flags & INP_DROPPED) { 372 INP_WUNLOCK(inp); 373 return (EINVAL); 374 } 375 tp = intotcpcb(inp); 376 377 SOCK_LOCK(so); 378 error = solisten_proto_check(so); 379 if (error != 0) { 380 SOCK_UNLOCK(so); 381 goto out; 382 } 383 if (inp->inp_lport == 0) { 384 INP_HASH_WLOCK(&V_tcbinfo); 385 error = in_pcbbind(inp, NULL, td->td_ucred); 386 INP_HASH_WUNLOCK(&V_tcbinfo); 387 } 388 if (error == 0) { 389 tcp_state_change(tp, TCPS_LISTEN); 390 solisten_proto(so, backlog); 391 #ifdef TCP_OFFLOAD 392 if ((so->so_options & SO_NO_OFFLOAD) == 0) 393 tcp_offload_listen_start(tp); 394 #endif 395 } else { 396 solisten_proto_abort(so); 397 } 398 SOCK_UNLOCK(so); 399 400 if (IS_FASTOPEN(tp->t_flags)) 401 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 402 403 out: 404 tcp_bblog_pru(tp, PRU_LISTEN, error); 405 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 406 INP_WUNLOCK(inp); 407 return (error); 408 } 409 #endif /* INET */ 410 411 #ifdef INET6 412 static int 413 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 414 { 415 int error = 0; 416 struct inpcb *inp; 417 struct tcpcb *tp; 418 u_char vflagsav; 419 420 inp = sotoinpcb(so); 421 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 422 INP_WLOCK(inp); 423 if (inp->inp_flags & INP_DROPPED) { 424 INP_WUNLOCK(inp); 425 return (EINVAL); 426 } 427 tp = intotcpcb(inp); 428 429 vflagsav = inp->inp_vflag; 430 431 SOCK_LOCK(so); 432 error = solisten_proto_check(so); 433 if (error != 0) { 434 SOCK_UNLOCK(so); 435 goto out; 436 } 437 INP_HASH_WLOCK(&V_tcbinfo); 438 if (inp->inp_lport == 0) { 439 inp->inp_vflag &= ~INP_IPV4; 440 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 441 inp->inp_vflag |= INP_IPV4; 442 error = in6_pcbbind(inp, NULL, td->td_ucred); 443 } 444 INP_HASH_WUNLOCK(&V_tcbinfo); 445 if (error == 0) { 446 tcp_state_change(tp, TCPS_LISTEN); 447 solisten_proto(so, backlog); 448 #ifdef TCP_OFFLOAD 449 if ((so->so_options & SO_NO_OFFLOAD) == 0) 450 tcp_offload_listen_start(tp); 451 #endif 452 } else { 453 solisten_proto_abort(so); 454 } 455 SOCK_UNLOCK(so); 456 457 if (IS_FASTOPEN(tp->t_flags)) 458 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 459 460 if (error != 0) 461 inp->inp_vflag = vflagsav; 462 463 out: 464 tcp_bblog_pru(tp, PRU_LISTEN, error); 465 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 466 INP_WUNLOCK(inp); 467 return (error); 468 } 469 #endif /* INET6 */ 470 471 #ifdef INET 472 /* 473 * Initiate connection to peer. 474 * Create a template for use in transmissions on this connection. 475 * Enter SYN_SENT state, and mark socket as connecting. 476 * Start keep-alive timer, and seed output sequence space. 477 * Send initial segment on connection. 478 */ 479 static int 480 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 481 { 482 struct epoch_tracker et; 483 int error = 0; 484 struct inpcb *inp; 485 struct tcpcb *tp; 486 struct sockaddr_in *sinp; 487 488 inp = sotoinpcb(so); 489 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 490 INP_WLOCK(inp); 491 if (inp->inp_flags & INP_DROPPED) { 492 INP_WUNLOCK(inp); 493 return (ECONNREFUSED); 494 } 495 tp = intotcpcb(inp); 496 497 sinp = (struct sockaddr_in *)nam; 498 if (nam->sa_family != AF_INET) { 499 error = EAFNOSUPPORT; 500 goto out; 501 } 502 if (nam->sa_len != sizeof (*sinp)) { 503 error = EINVAL; 504 goto out; 505 } 506 /* 507 * Must disallow TCP ``connections'' to multicast addresses. 508 */ 509 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 510 error = EAFNOSUPPORT; 511 goto out; 512 } 513 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 514 error = EACCES; 515 goto out; 516 } 517 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 518 goto out; 519 if (SOLISTENING(so)) { 520 error = EOPNOTSUPP; 521 goto out; 522 } 523 NET_EPOCH_ENTER(et); 524 if ((error = tcp_connect(tp, sinp, td)) != 0) 525 goto out_in_epoch; 526 #ifdef TCP_OFFLOAD 527 if (registered_toedevs > 0 && 528 (so->so_options & SO_NO_OFFLOAD) == 0 && 529 (error = tcp_offload_connect(so, nam)) == 0) 530 goto out_in_epoch; 531 #endif 532 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 533 error = tcp_output(tp); 534 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()" 535 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error)); 536 out_in_epoch: 537 NET_EPOCH_EXIT(et); 538 out: 539 tcp_bblog_pru(tp, PRU_CONNECT, error); 540 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 541 INP_WUNLOCK(inp); 542 return (error); 543 } 544 #endif /* INET */ 545 546 #ifdef INET6 547 static int 548 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 549 { 550 struct epoch_tracker et; 551 int error = 0; 552 struct inpcb *inp; 553 struct tcpcb *tp; 554 struct sockaddr_in6 *sin6; 555 u_int8_t incflagsav; 556 u_char vflagsav; 557 558 inp = sotoinpcb(so); 559 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 560 INP_WLOCK(inp); 561 if (inp->inp_flags & INP_DROPPED) { 562 INP_WUNLOCK(inp); 563 return (ECONNREFUSED); 564 } 565 tp = intotcpcb(inp); 566 567 vflagsav = inp->inp_vflag; 568 incflagsav = inp->inp_inc.inc_flags; 569 570 sin6 = (struct sockaddr_in6 *)nam; 571 if (nam->sa_family != AF_INET6) { 572 error = EAFNOSUPPORT; 573 goto out; 574 } 575 if (nam->sa_len != sizeof (*sin6)) { 576 error = EINVAL; 577 goto out; 578 } 579 /* 580 * Must disallow TCP ``connections'' to multicast addresses. 581 */ 582 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 583 error = EAFNOSUPPORT; 584 goto out; 585 } 586 if (SOLISTENING(so)) { 587 error = EINVAL; 588 goto out; 589 } 590 #ifdef INET 591 /* 592 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 593 * therefore probably require the hash lock, which isn't held here. 594 * Is this a significant problem? 595 */ 596 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 597 struct sockaddr_in sin; 598 599 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 600 error = EINVAL; 601 goto out; 602 } 603 if ((inp->inp_vflag & INP_IPV4) == 0) { 604 error = EAFNOSUPPORT; 605 goto out; 606 } 607 608 in6_sin6_2_sin(&sin, sin6); 609 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 610 error = EAFNOSUPPORT; 611 goto out; 612 } 613 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) { 614 error = EACCES; 615 goto out; 616 } 617 if ((error = prison_remote_ip4(td->td_ucred, 618 &sin.sin_addr)) != 0) 619 goto out; 620 inp->inp_vflag |= INP_IPV4; 621 inp->inp_vflag &= ~INP_IPV6; 622 NET_EPOCH_ENTER(et); 623 if ((error = tcp_connect(tp, &sin, td)) != 0) 624 goto out_in_epoch; 625 #ifdef TCP_OFFLOAD 626 if (registered_toedevs > 0 && 627 (so->so_options & SO_NO_OFFLOAD) == 0 && 628 (error = tcp_offload_connect(so, nam)) == 0) 629 goto out_in_epoch; 630 #endif 631 error = tcp_output(tp); 632 goto out_in_epoch; 633 } else { 634 if ((inp->inp_vflag & INP_IPV6) == 0) { 635 error = EAFNOSUPPORT; 636 goto out; 637 } 638 } 639 #endif 640 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 641 goto out; 642 inp->inp_vflag &= ~INP_IPV4; 643 inp->inp_vflag |= INP_IPV6; 644 inp->inp_inc.inc_flags |= INC_ISIPV6; 645 NET_EPOCH_ENTER(et); 646 if ((error = tcp6_connect(tp, sin6, td)) != 0) 647 goto out_in_epoch; 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_in_epoch; 653 #endif 654 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 655 error = tcp_output(tp); 656 out_in_epoch: 657 NET_EPOCH_EXIT(et); 658 out: 659 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()" 660 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error)); 661 /* 662 * If the implicit bind in the connect call fails, restore 663 * the flags we modified. 664 */ 665 if (error != 0 && inp->inp_lport == 0) { 666 inp->inp_vflag = vflagsav; 667 inp->inp_inc.inc_flags = incflagsav; 668 } 669 670 tcp_bblog_pru(tp, PRU_CONNECT, error); 671 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 672 INP_WUNLOCK(inp); 673 return (error); 674 } 675 #endif /* INET6 */ 676 677 /* 678 * Initiate disconnect from peer. 679 * If connection never passed embryonic stage, just drop; 680 * else if don't need to let data drain, then can just drop anyways, 681 * else have to begin TCP shutdown process: mark socket disconnecting, 682 * drain unread data, state switch to reflect user close, and 683 * send segment (e.g. FIN) to peer. Socket will be really disconnected 684 * when peer sends FIN and acks ours. 685 * 686 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 687 */ 688 static int 689 tcp_usr_disconnect(struct socket *so) 690 { 691 struct inpcb *inp; 692 struct tcpcb *tp = NULL; 693 struct epoch_tracker et; 694 int error = 0; 695 696 NET_EPOCH_ENTER(et); 697 inp = sotoinpcb(so); 698 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 699 INP_WLOCK(inp); 700 if (inp->inp_flags & INP_DROPPED) { 701 INP_WUNLOCK(inp); 702 NET_EPOCH_EXIT(et); 703 return (ECONNRESET); 704 } 705 tp = intotcpcb(inp); 706 707 if (tp->t_state == TCPS_TIME_WAIT) 708 goto out; 709 tcp_disconnect(tp); 710 out: 711 tcp_bblog_pru(tp, PRU_DISCONNECT, error); 712 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 713 INP_WUNLOCK(inp); 714 NET_EPOCH_EXIT(et); 715 return (error); 716 } 717 718 #ifdef INET 719 /* 720 * Accept a connection. Essentially all the work is done at higher levels; 721 * just return the address of the peer, storing through addr. 722 */ 723 static int 724 tcp_usr_accept(struct socket *so, struct sockaddr **nam) 725 { 726 int error = 0; 727 struct inpcb *inp; 728 struct tcpcb *tp; 729 struct in_addr addr; 730 in_port_t port = 0; 731 732 inp = sotoinpcb(so); 733 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 734 INP_WLOCK(inp); 735 if (inp->inp_flags & INP_DROPPED) { 736 INP_WUNLOCK(inp); 737 return (ECONNABORTED); 738 } 739 tp = intotcpcb(inp); 740 741 if (so->so_state & SS_ISDISCONNECTED) { 742 error = ECONNABORTED; 743 goto out; 744 } 745 /* 746 * We inline in_getpeeraddr and COMMON_END here, so that we can 747 * copy the data of interest and defer the malloc until after we 748 * release the lock. 749 */ 750 port = inp->inp_fport; 751 addr = inp->inp_faddr; 752 753 out: 754 tcp_bblog_pru(tp, PRU_ACCEPT, error); 755 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 756 INP_WUNLOCK(inp); 757 if (error == 0) 758 *nam = in_sockaddr(port, &addr); 759 return error; 760 } 761 #endif /* INET */ 762 763 #ifdef INET6 764 static int 765 tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 766 { 767 struct inpcb *inp; 768 int error = 0; 769 struct tcpcb *tp; 770 struct in_addr addr; 771 struct in6_addr addr6; 772 struct epoch_tracker et; 773 in_port_t port = 0; 774 int v4 = 0; 775 776 inp = sotoinpcb(so); 777 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 778 NET_EPOCH_ENTER(et); /* XXXMT Why is this needed? */ 779 INP_WLOCK(inp); 780 if (inp->inp_flags & INP_DROPPED) { 781 INP_WUNLOCK(inp); 782 NET_EPOCH_EXIT(et); 783 return (ECONNABORTED); 784 } 785 tp = intotcpcb(inp); 786 787 if (so->so_state & SS_ISDISCONNECTED) { 788 error = ECONNABORTED; 789 goto out; 790 } 791 /* 792 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 793 * copy the data of interest and defer the malloc until after we 794 * release the lock. 795 */ 796 if (inp->inp_vflag & INP_IPV4) { 797 v4 = 1; 798 port = inp->inp_fport; 799 addr = inp->inp_faddr; 800 } else { 801 port = inp->inp_fport; 802 addr6 = inp->in6p_faddr; 803 } 804 805 out: 806 tcp_bblog_pru(tp, PRU_ACCEPT, error); 807 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 808 INP_WUNLOCK(inp); 809 NET_EPOCH_EXIT(et); 810 if (error == 0) { 811 if (v4) 812 *nam = in6_v4mapsin6_sockaddr(port, &addr); 813 else 814 *nam = in6_sockaddr(port, &addr6); 815 } 816 return error; 817 } 818 #endif /* INET6 */ 819 820 /* 821 * Mark the connection as being incapable of further output. 822 */ 823 static int 824 tcp_usr_shutdown(struct socket *so) 825 { 826 int error = 0; 827 struct inpcb *inp; 828 struct tcpcb *tp; 829 struct epoch_tracker et; 830 831 inp = sotoinpcb(so); 832 KASSERT(inp != NULL, ("inp == NULL")); 833 INP_WLOCK(inp); 834 if (inp->inp_flags & INP_DROPPED) { 835 INP_WUNLOCK(inp); 836 return (ECONNRESET); 837 } 838 tp = intotcpcb(inp); 839 840 NET_EPOCH_ENTER(et); 841 socantsendmore(so); 842 tcp_usrclosed(tp); 843 if (!(inp->inp_flags & INP_DROPPED)) 844 error = tcp_output_nodrop(tp); 845 tcp_bblog_pru(tp, PRU_SHUTDOWN, error); 846 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 847 error = tcp_unlock_or_drop(tp, error); 848 NET_EPOCH_EXIT(et); 849 850 return (error); 851 } 852 853 /* 854 * After a receive, possibly send window update to peer. 855 */ 856 static int 857 tcp_usr_rcvd(struct socket *so, int flags) 858 { 859 struct epoch_tracker et; 860 struct inpcb *inp; 861 struct tcpcb *tp; 862 int outrv = 0, error = 0; 863 864 inp = sotoinpcb(so); 865 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 866 INP_WLOCK(inp); 867 if (inp->inp_flags & INP_DROPPED) { 868 INP_WUNLOCK(inp); 869 return (ECONNRESET); 870 } 871 tp = intotcpcb(inp); 872 873 NET_EPOCH_ENTER(et); 874 /* 875 * For passively-created TFO connections, don't attempt a window 876 * update while still in SYN_RECEIVED as this may trigger an early 877 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 878 * application response data, or failing that, when the DELACK timer 879 * expires. 880 */ 881 if (IS_FASTOPEN(tp->t_flags) && 882 (tp->t_state == TCPS_SYN_RECEIVED)) 883 goto out; 884 #ifdef TCP_OFFLOAD 885 if (tp->t_flags & TF_TOE) 886 tcp_offload_rcvd(tp); 887 else 888 #endif 889 outrv = tcp_output_nodrop(tp); 890 out: 891 tcp_bblog_pru(tp, PRU_RCVD, error); 892 TCP_PROBE2(debug__user, tp, PRU_RCVD); 893 (void) tcp_unlock_or_drop(tp, outrv); 894 NET_EPOCH_EXIT(et); 895 return (error); 896 } 897 898 /* 899 * Do a send by putting data in output queue and updating urgent 900 * marker if URG set. Possibly send more data. Unlike the other 901 * pru_*() routines, the mbuf chains are our responsibility. We 902 * must either enqueue them or free them. The other pru_* routines 903 * generally are caller-frees. 904 */ 905 static int 906 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 907 struct sockaddr *nam, struct mbuf *control, struct thread *td) 908 { 909 struct epoch_tracker et; 910 int error = 0; 911 struct inpcb *inp; 912 struct tcpcb *tp; 913 #ifdef INET 914 #ifdef INET6 915 struct sockaddr_in sin; 916 #endif 917 struct sockaddr_in *sinp; 918 #endif 919 #ifdef INET6 920 struct sockaddr_in6 *sin6; 921 int isipv6; 922 #endif 923 u_int8_t incflagsav; 924 u_char vflagsav; 925 bool restoreflags; 926 927 inp = sotoinpcb(so); 928 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 929 INP_WLOCK(inp); 930 if (inp->inp_flags & INP_DROPPED) { 931 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 932 m_freem(m); 933 INP_WUNLOCK(inp); 934 return (ECONNRESET); 935 } 936 tp = intotcpcb(inp); 937 938 vflagsav = inp->inp_vflag; 939 incflagsav = inp->inp_inc.inc_flags; 940 restoreflags = false; 941 942 NET_EPOCH_ENTER(et); 943 if (control != NULL) { 944 /* TCP doesn't do control messages (rights, creds, etc) */ 945 if (control->m_len > 0) { 946 m_freem(control); 947 error = EINVAL; 948 goto out; 949 } 950 m_freem(control); /* empty control, just free it */ 951 } 952 953 if ((flags & PRUS_OOB) != 0 && 954 (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) 955 goto out; 956 957 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 958 if (tp->t_state == TCPS_LISTEN) { 959 error = EINVAL; 960 goto out; 961 } 962 switch (nam->sa_family) { 963 #ifdef INET 964 case AF_INET: 965 sinp = (struct sockaddr_in *)nam; 966 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 967 error = EINVAL; 968 goto out; 969 } 970 if ((inp->inp_vflag & INP_IPV6) != 0) { 971 error = EAFNOSUPPORT; 972 goto out; 973 } 974 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 975 error = EAFNOSUPPORT; 976 goto out; 977 } 978 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 979 error = EACCES; 980 goto out; 981 } 982 if ((error = prison_remote_ip4(td->td_ucred, 983 &sinp->sin_addr))) 984 goto out; 985 #ifdef INET6 986 isipv6 = 0; 987 #endif 988 break; 989 #endif /* INET */ 990 #ifdef INET6 991 case AF_INET6: 992 sin6 = (struct sockaddr_in6 *)nam; 993 if (sin6->sin6_len != sizeof(*sin6)) { 994 error = EINVAL; 995 goto out; 996 } 997 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 998 error = EAFNOSUPPORT; 999 goto out; 1000 } 1001 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 1002 error = EAFNOSUPPORT; 1003 goto out; 1004 } 1005 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 1006 #ifdef INET 1007 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 1008 error = EINVAL; 1009 goto out; 1010 } 1011 if ((inp->inp_vflag & INP_IPV4) == 0) { 1012 error = EAFNOSUPPORT; 1013 goto out; 1014 } 1015 restoreflags = true; 1016 inp->inp_vflag &= ~INP_IPV6; 1017 sinp = &sin; 1018 in6_sin6_2_sin(sinp, sin6); 1019 if (IN_MULTICAST( 1020 ntohl(sinp->sin_addr.s_addr))) { 1021 error = EAFNOSUPPORT; 1022 goto out; 1023 } 1024 if ((error = prison_remote_ip4(td->td_ucred, 1025 &sinp->sin_addr))) 1026 goto out; 1027 isipv6 = 0; 1028 #else /* !INET */ 1029 error = EAFNOSUPPORT; 1030 goto out; 1031 #endif /* INET */ 1032 } else { 1033 if ((inp->inp_vflag & INP_IPV6) == 0) { 1034 error = EAFNOSUPPORT; 1035 goto out; 1036 } 1037 restoreflags = true; 1038 inp->inp_vflag &= ~INP_IPV4; 1039 inp->inp_inc.inc_flags |= INC_ISIPV6; 1040 if ((error = prison_remote_ip6(td->td_ucred, 1041 &sin6->sin6_addr))) 1042 goto out; 1043 isipv6 = 1; 1044 } 1045 break; 1046 #endif /* INET6 */ 1047 default: 1048 error = EAFNOSUPPORT; 1049 goto out; 1050 } 1051 } 1052 if (!(flags & PRUS_OOB)) { 1053 if (tp->t_acktime == 0) 1054 tp->t_acktime = ticks; 1055 sbappendstream(&so->so_snd, m, flags); 1056 m = NULL; 1057 if (nam && tp->t_state < TCPS_SYN_SENT) { 1058 KASSERT(tp->t_state == TCPS_CLOSED, 1059 ("%s: tp %p is listening", __func__, tp)); 1060 1061 /* 1062 * Do implied connect if not yet connected, 1063 * initialize window to default value, and 1064 * initialize maxseg using peer's cached MSS. 1065 */ 1066 #ifdef INET6 1067 if (isipv6) 1068 error = tcp6_connect(tp, sin6, td); 1069 #endif /* INET6 */ 1070 #if defined(INET6) && defined(INET) 1071 else 1072 #endif 1073 #ifdef INET 1074 error = tcp_connect(tp, sinp, td); 1075 #endif 1076 /* 1077 * The bind operation in tcp_connect succeeded. We 1078 * no longer want to restore the flags if later 1079 * operations fail. 1080 */ 1081 if (error == 0 || inp->inp_lport != 0) 1082 restoreflags = false; 1083 1084 if (error) { 1085 /* m is freed if PRUS_NOTREADY is unset. */ 1086 sbflush(&so->so_snd); 1087 goto out; 1088 } 1089 if (IS_FASTOPEN(tp->t_flags)) 1090 tcp_fastopen_connect(tp); 1091 else { 1092 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1093 tcp_mss(tp, -1); 1094 } 1095 } 1096 if (flags & PRUS_EOF) { 1097 /* 1098 * Close the send side of the connection after 1099 * the data is sent. 1100 */ 1101 socantsendmore(so); 1102 tcp_usrclosed(tp); 1103 } 1104 if (TCPS_HAVEESTABLISHED(tp->t_state) && 1105 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 1106 (tp->t_fbyte_out == 0) && 1107 (so->so_snd.sb_ccc > 0)) { 1108 tp->t_fbyte_out = ticks; 1109 if (tp->t_fbyte_out == 0) 1110 tp->t_fbyte_out = 1; 1111 if (tp->t_fbyte_out && tp->t_fbyte_in) 1112 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 1113 } 1114 if (!(inp->inp_flags & INP_DROPPED) && 1115 !(flags & PRUS_NOTREADY)) { 1116 if (flags & PRUS_MORETOCOME) 1117 tp->t_flags |= TF_MORETOCOME; 1118 error = tcp_output_nodrop(tp); 1119 if (flags & PRUS_MORETOCOME) 1120 tp->t_flags &= ~TF_MORETOCOME; 1121 } 1122 } else { 1123 /* 1124 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1125 */ 1126 SOCKBUF_LOCK(&so->so_snd); 1127 if (sbspace(&so->so_snd) < -512) { 1128 SOCKBUF_UNLOCK(&so->so_snd); 1129 error = ENOBUFS; 1130 goto out; 1131 } 1132 /* 1133 * According to RFC961 (Assigned Protocols), 1134 * the urgent pointer points to the last octet 1135 * of urgent data. We continue, however, 1136 * to consider it to indicate the first octet 1137 * of data past the urgent section. 1138 * Otherwise, snd_up should be one lower. 1139 */ 1140 if (tp->t_acktime == 0) 1141 tp->t_acktime = ticks; 1142 sbappendstream_locked(&so->so_snd, m, flags); 1143 SOCKBUF_UNLOCK(&so->so_snd); 1144 m = NULL; 1145 if (nam && tp->t_state < TCPS_SYN_SENT) { 1146 /* 1147 * Do implied connect if not yet connected, 1148 * initialize window to default value, and 1149 * initialize maxseg using peer's cached MSS. 1150 */ 1151 1152 /* 1153 * Not going to contemplate SYN|URG 1154 */ 1155 if (IS_FASTOPEN(tp->t_flags)) 1156 tp->t_flags &= ~TF_FASTOPEN; 1157 #ifdef INET6 1158 if (isipv6) 1159 error = tcp6_connect(tp, sin6, td); 1160 #endif /* INET6 */ 1161 #if defined(INET6) && defined(INET) 1162 else 1163 #endif 1164 #ifdef INET 1165 error = tcp_connect(tp, sinp, td); 1166 #endif 1167 /* 1168 * The bind operation in tcp_connect succeeded. We 1169 * no longer want to restore the flags if later 1170 * operations fail. 1171 */ 1172 if (error == 0 || inp->inp_lport != 0) 1173 restoreflags = false; 1174 1175 if (error != 0) { 1176 /* m is freed if PRUS_NOTREADY is unset. */ 1177 sbflush(&so->so_snd); 1178 goto out; 1179 } 1180 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1181 tcp_mss(tp, -1); 1182 } 1183 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1184 if ((flags & PRUS_NOTREADY) == 0) { 1185 tp->t_flags |= TF_FORCEDATA; 1186 error = tcp_output_nodrop(tp); 1187 tp->t_flags &= ~TF_FORCEDATA; 1188 } 1189 } 1190 TCP_LOG_EVENT(tp, NULL, 1191 &inp->inp_socket->so_rcv, 1192 &inp->inp_socket->so_snd, 1193 TCP_LOG_USERSEND, error, 1194 0, NULL, false); 1195 1196 out: 1197 /* 1198 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is 1199 * responsible for freeing memory. 1200 */ 1201 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 1202 m_freem(m); 1203 1204 /* 1205 * If the request was unsuccessful and we changed flags, 1206 * restore the original flags. 1207 */ 1208 if (error != 0 && restoreflags) { 1209 inp->inp_vflag = vflagsav; 1210 inp->inp_inc.inc_flags = incflagsav; 1211 } 1212 tcp_bblog_pru(tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1213 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), error); 1214 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1215 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1216 error = tcp_unlock_or_drop(tp, error); 1217 NET_EPOCH_EXIT(et); 1218 return (error); 1219 } 1220 1221 static int 1222 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1223 { 1224 struct epoch_tracker et; 1225 struct inpcb *inp; 1226 struct tcpcb *tp; 1227 int error; 1228 1229 inp = sotoinpcb(so); 1230 INP_WLOCK(inp); 1231 if (inp->inp_flags & INP_DROPPED) { 1232 INP_WUNLOCK(inp); 1233 mb_free_notready(m, count); 1234 return (ECONNRESET); 1235 } 1236 tp = intotcpcb(inp); 1237 1238 SOCKBUF_LOCK(&so->so_snd); 1239 error = sbready(&so->so_snd, m, count); 1240 SOCKBUF_UNLOCK(&so->so_snd); 1241 if (error) { 1242 INP_WUNLOCK(inp); 1243 return (error); 1244 } 1245 NET_EPOCH_ENTER(et); 1246 error = tcp_output_unlock(tp); 1247 NET_EPOCH_EXIT(et); 1248 1249 return (error); 1250 } 1251 1252 /* 1253 * Abort the TCP. Drop the connection abruptly. 1254 */ 1255 static void 1256 tcp_usr_abort(struct socket *so) 1257 { 1258 struct inpcb *inp; 1259 struct tcpcb *tp; 1260 struct epoch_tracker et; 1261 1262 inp = sotoinpcb(so); 1263 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1264 1265 NET_EPOCH_ENTER(et); 1266 INP_WLOCK(inp); 1267 KASSERT(inp->inp_socket != NULL, 1268 ("tcp_usr_abort: inp_socket == NULL")); 1269 1270 /* 1271 * If we still have full TCP state, and we're not dropped, drop. 1272 */ 1273 if (!(inp->inp_flags & INP_DROPPED)) { 1274 tp = intotcpcb(inp); 1275 tp = tcp_drop(tp, ECONNABORTED); 1276 if (tp == NULL) 1277 goto dropped; 1278 tcp_bblog_pru(tp, PRU_ABORT, 0); 1279 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1280 } 1281 if (!(inp->inp_flags & INP_DROPPED)) { 1282 soref(so); 1283 inp->inp_flags |= INP_SOCKREF; 1284 } 1285 INP_WUNLOCK(inp); 1286 dropped: 1287 NET_EPOCH_EXIT(et); 1288 } 1289 1290 /* 1291 * TCP socket is closed. Start friendly disconnect. 1292 */ 1293 static void 1294 tcp_usr_close(struct socket *so) 1295 { 1296 struct inpcb *inp; 1297 struct tcpcb *tp; 1298 struct epoch_tracker et; 1299 1300 inp = sotoinpcb(so); 1301 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1302 1303 NET_EPOCH_ENTER(et); 1304 INP_WLOCK(inp); 1305 KASSERT(inp->inp_socket != NULL, 1306 ("tcp_usr_close: inp_socket == NULL")); 1307 1308 /* 1309 * If we are still connected and we're not dropped, initiate 1310 * a disconnect. 1311 */ 1312 if (!(inp->inp_flags & INP_DROPPED)) { 1313 tp = intotcpcb(inp); 1314 if (tp->t_state != TCPS_TIME_WAIT) { 1315 tp->t_flags |= TF_CLOSED; 1316 tcp_disconnect(tp); 1317 tcp_bblog_pru(tp, PRU_CLOSE, 0); 1318 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1319 } 1320 } 1321 if (!(inp->inp_flags & INP_DROPPED)) { 1322 soref(so); 1323 inp->inp_flags |= INP_SOCKREF; 1324 } 1325 INP_WUNLOCK(inp); 1326 NET_EPOCH_EXIT(et); 1327 } 1328 1329 static int 1330 tcp_pru_options_support(struct tcpcb *tp, int flags) 1331 { 1332 /* 1333 * If the specific TCP stack has a pru_options 1334 * specified then it does not always support 1335 * all the PRU_XX options and we must ask it. 1336 * If the function is not specified then all 1337 * of the PRU_XX options are supported. 1338 */ 1339 int ret = 0; 1340 1341 if (tp->t_fb->tfb_pru_options) { 1342 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1343 } 1344 return (ret); 1345 } 1346 1347 /* 1348 * Receive out-of-band data. 1349 */ 1350 static int 1351 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1352 { 1353 int error = 0; 1354 struct inpcb *inp; 1355 struct tcpcb *tp; 1356 1357 inp = sotoinpcb(so); 1358 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1359 INP_WLOCK(inp); 1360 if (inp->inp_flags & INP_DROPPED) { 1361 INP_WUNLOCK(inp); 1362 return (ECONNRESET); 1363 } 1364 tp = intotcpcb(inp); 1365 1366 error = tcp_pru_options_support(tp, PRUS_OOB); 1367 if (error) { 1368 goto out; 1369 } 1370 if ((so->so_oobmark == 0 && 1371 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1372 so->so_options & SO_OOBINLINE || 1373 tp->t_oobflags & TCPOOB_HADDATA) { 1374 error = EINVAL; 1375 goto out; 1376 } 1377 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1378 error = EWOULDBLOCK; 1379 goto out; 1380 } 1381 m->m_len = 1; 1382 *mtod(m, caddr_t) = tp->t_iobc; 1383 if ((flags & MSG_PEEK) == 0) 1384 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1385 1386 out: 1387 tcp_bblog_pru(tp, PRU_RCVOOB, error); 1388 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1389 INP_WUNLOCK(inp); 1390 return (error); 1391 } 1392 1393 #ifdef INET 1394 struct protosw tcp_protosw = { 1395 .pr_type = SOCK_STREAM, 1396 .pr_protocol = IPPROTO_TCP, 1397 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD | 1398 PR_CAPATTACH, 1399 .pr_ctloutput = tcp_ctloutput, 1400 .pr_abort = tcp_usr_abort, 1401 .pr_accept = tcp_usr_accept, 1402 .pr_attach = tcp_usr_attach, 1403 .pr_bind = tcp_usr_bind, 1404 .pr_connect = tcp_usr_connect, 1405 .pr_control = in_control, 1406 .pr_detach = tcp_usr_detach, 1407 .pr_disconnect = tcp_usr_disconnect, 1408 .pr_listen = tcp_usr_listen, 1409 .pr_peeraddr = in_getpeeraddr, 1410 .pr_rcvd = tcp_usr_rcvd, 1411 .pr_rcvoob = tcp_usr_rcvoob, 1412 .pr_send = tcp_usr_send, 1413 .pr_ready = tcp_usr_ready, 1414 .pr_shutdown = tcp_usr_shutdown, 1415 .pr_sockaddr = in_getsockaddr, 1416 .pr_sosetlabel = in_pcbsosetlabel, 1417 .pr_close = tcp_usr_close, 1418 }; 1419 #endif /* INET */ 1420 1421 #ifdef INET6 1422 struct protosw tcp6_protosw = { 1423 .pr_type = SOCK_STREAM, 1424 .pr_protocol = IPPROTO_TCP, 1425 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD | 1426 PR_CAPATTACH, 1427 .pr_ctloutput = tcp_ctloutput, 1428 .pr_abort = tcp_usr_abort, 1429 .pr_accept = tcp6_usr_accept, 1430 .pr_attach = tcp_usr_attach, 1431 .pr_bind = tcp6_usr_bind, 1432 .pr_connect = tcp6_usr_connect, 1433 .pr_control = in6_control, 1434 .pr_detach = tcp_usr_detach, 1435 .pr_disconnect = tcp_usr_disconnect, 1436 .pr_listen = tcp6_usr_listen, 1437 .pr_peeraddr = in6_mapped_peeraddr, 1438 .pr_rcvd = tcp_usr_rcvd, 1439 .pr_rcvoob = tcp_usr_rcvoob, 1440 .pr_send = tcp_usr_send, 1441 .pr_ready = tcp_usr_ready, 1442 .pr_shutdown = tcp_usr_shutdown, 1443 .pr_sockaddr = in6_mapped_sockaddr, 1444 .pr_sosetlabel = in_pcbsosetlabel, 1445 .pr_close = tcp_usr_close, 1446 }; 1447 #endif /* INET6 */ 1448 1449 #ifdef INET 1450 /* 1451 * Common subroutine to open a TCP connection to remote host specified 1452 * by struct sockaddr_in. Call in_pcbconnect() to choose local host address 1453 * and assign a local port number and install the inpcb into the hash. 1454 * Initialize connection parameters and enter SYN-SENT state. 1455 */ 1456 static int 1457 tcp_connect(struct tcpcb *tp, struct sockaddr_in *sin, struct thread *td) 1458 { 1459 struct inpcb *inp = tptoinpcb(tp); 1460 struct socket *so = tptosocket(tp); 1461 int error; 1462 1463 NET_EPOCH_ASSERT(); 1464 INP_WLOCK_ASSERT(inp); 1465 1466 if (__predict_false((so->so_state & 1467 (SS_ISCONNECTING | SS_ISCONNECTED)) != 0)) 1468 return (EISCONN); 1469 1470 INP_HASH_WLOCK(&V_tcbinfo); 1471 error = in_pcbconnect(inp, sin, td->td_ucred, true); 1472 INP_HASH_WUNLOCK(&V_tcbinfo); 1473 if (error != 0) 1474 return (error); 1475 1476 /* 1477 * Compute window scaling to request: 1478 * Scale to fit into sweet spot. See tcp_syncache.c. 1479 * XXX: This should move to tcp_output(). 1480 */ 1481 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1482 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1483 tp->request_r_scale++; 1484 1485 soisconnecting(so); 1486 TCPSTAT_INC(tcps_connattempt); 1487 tcp_state_change(tp, TCPS_SYN_SENT); 1488 tp->iss = tcp_new_isn(&inp->inp_inc); 1489 if (tp->t_flags & TF_REQ_TSTMP) 1490 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1491 tcp_sendseqinit(tp); 1492 1493 return (0); 1494 } 1495 #endif /* INET */ 1496 1497 #ifdef INET6 1498 static int 1499 tcp6_connect(struct tcpcb *tp, struct sockaddr_in6 *sin6, struct thread *td) 1500 { 1501 struct inpcb *inp = tptoinpcb(tp); 1502 struct socket *so = tptosocket(tp); 1503 int error; 1504 1505 NET_EPOCH_ASSERT(); 1506 INP_WLOCK_ASSERT(inp); 1507 1508 if (__predict_false((so->so_state & 1509 (SS_ISCONNECTING | SS_ISCONNECTED)) != 0)) 1510 return (EISCONN); 1511 1512 INP_HASH_WLOCK(&V_tcbinfo); 1513 error = in6_pcbconnect(inp, sin6, td->td_ucred, true); 1514 INP_HASH_WUNLOCK(&V_tcbinfo); 1515 if (error != 0) 1516 return (error); 1517 1518 /* Compute window scaling to request. */ 1519 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1520 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1521 tp->request_r_scale++; 1522 1523 soisconnecting(so); 1524 TCPSTAT_INC(tcps_connattempt); 1525 tcp_state_change(tp, TCPS_SYN_SENT); 1526 tp->iss = tcp_new_isn(&inp->inp_inc); 1527 if (tp->t_flags & TF_REQ_TSTMP) 1528 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1529 tcp_sendseqinit(tp); 1530 1531 return (0); 1532 } 1533 #endif /* INET6 */ 1534 1535 /* 1536 * Export TCP internal state information via a struct tcp_info, based on the 1537 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1538 * (TCP state machine, etc). We export all information using FreeBSD-native 1539 * constants -- for example, the numeric values for tcpi_state will differ 1540 * from Linux. 1541 */ 1542 static void 1543 tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1544 { 1545 1546 INP_WLOCK_ASSERT(tptoinpcb(tp)); 1547 bzero(ti, sizeof(*ti)); 1548 1549 ti->tcpi_state = tp->t_state; 1550 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1551 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1552 if (tp->t_flags & TF_SACK_PERMIT) 1553 ti->tcpi_options |= TCPI_OPT_SACK; 1554 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1555 ti->tcpi_options |= TCPI_OPT_WSCALE; 1556 ti->tcpi_snd_wscale = tp->snd_scale; 1557 ti->tcpi_rcv_wscale = tp->rcv_scale; 1558 } 1559 switch (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) { 1560 case TF2_ECN_PERMIT: 1561 ti->tcpi_options |= TCPI_OPT_ECN; 1562 break; 1563 case TF2_ACE_PERMIT: 1564 /* FALLTHROUGH */ 1565 case TF2_ECN_PERMIT | TF2_ACE_PERMIT: 1566 ti->tcpi_options |= TCPI_OPT_ACE; 1567 break; 1568 default: 1569 break; 1570 } 1571 if (IS_FASTOPEN(tp->t_flags)) 1572 ti->tcpi_options |= TCPI_OPT_TFO; 1573 1574 ti->tcpi_rto = tp->t_rxtcur * tick; 1575 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1576 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1577 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1578 1579 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1580 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1581 1582 /* 1583 * FreeBSD-specific extension fields for tcp_info. 1584 */ 1585 ti->tcpi_rcv_space = tp->rcv_wnd; 1586 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1587 ti->tcpi_snd_wnd = tp->snd_wnd; 1588 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1589 ti->tcpi_snd_nxt = tp->snd_nxt; 1590 ti->tcpi_snd_mss = tp->t_maxseg; 1591 ti->tcpi_rcv_mss = tp->t_maxseg; 1592 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1593 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1594 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1595 #ifdef TCP_OFFLOAD 1596 if (tp->t_flags & TF_TOE) { 1597 ti->tcpi_options |= TCPI_OPT_TOE; 1598 tcp_offload_tcp_info(tp, ti); 1599 } 1600 #endif 1601 /* 1602 * AccECN related counters. 1603 */ 1604 if ((tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) == 1605 (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) 1606 /* 1607 * Internal counter starts at 5 for AccECN 1608 * but 0 for RFC3168 ECN. 1609 */ 1610 ti->tcpi_delivered_ce = tp->t_scep - 5; 1611 else 1612 ti->tcpi_delivered_ce = tp->t_scep; 1613 ti->tcpi_received_ce = tp->t_rcep; 1614 } 1615 1616 /* 1617 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1618 * socket option arguments. When it re-acquires the lock after the copy, it 1619 * has to revalidate that the connection is still valid for the socket 1620 * option. 1621 */ 1622 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1623 INP_WLOCK(inp); \ 1624 if (inp->inp_flags & INP_DROPPED) { \ 1625 INP_WUNLOCK(inp); \ 1626 cleanup; \ 1627 return (ECONNRESET); \ 1628 } \ 1629 tp = intotcpcb(inp); \ 1630 } while(0) 1631 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1632 1633 int 1634 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt) 1635 { 1636 struct socket *so = inp->inp_socket; 1637 struct tcpcb *tp = intotcpcb(inp); 1638 int error = 0; 1639 1640 MPASS(sopt->sopt_dir == SOPT_SET); 1641 INP_WLOCK_ASSERT(inp); 1642 KASSERT((inp->inp_flags & INP_DROPPED) == 0, 1643 ("inp_flags == %x", inp->inp_flags)); 1644 KASSERT(so != NULL, ("inp_socket == NULL")); 1645 1646 if (sopt->sopt_level != IPPROTO_TCP) { 1647 INP_WUNLOCK(inp); 1648 #ifdef INET6 1649 if (inp->inp_vflag & INP_IPV6PROTO) 1650 error = ip6_ctloutput(so, sopt); 1651 #endif 1652 #if defined(INET6) && defined(INET) 1653 else 1654 #endif 1655 #ifdef INET 1656 error = ip_ctloutput(so, sopt); 1657 #endif 1658 /* 1659 * When an IP-level socket option affects TCP, pass control 1660 * down to stack tfb_tcp_ctloutput, otherwise return what 1661 * IP level returned. 1662 */ 1663 switch (sopt->sopt_level) { 1664 #ifdef INET6 1665 case IPPROTO_IPV6: 1666 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) 1667 return (error); 1668 switch (sopt->sopt_name) { 1669 case IPV6_TCLASS: 1670 /* Notify tcp stacks that care (e.g. RACK). */ 1671 break; 1672 case IPV6_USE_MIN_MTU: 1673 /* Update t_maxseg accordingly. */ 1674 break; 1675 default: 1676 return (error); 1677 } 1678 break; 1679 #endif 1680 #ifdef INET 1681 case IPPROTO_IP: 1682 switch (sopt->sopt_name) { 1683 case IP_TOS: 1684 inp->inp_ip_tos &= ~IPTOS_ECN_MASK; 1685 break; 1686 case IP_TTL: 1687 /* Notify tcp stacks that care (e.g. RACK). */ 1688 break; 1689 default: 1690 return (error); 1691 } 1692 break; 1693 #endif 1694 default: 1695 return (error); 1696 } 1697 INP_WLOCK(inp); 1698 if (inp->inp_flags & INP_DROPPED) { 1699 INP_WUNLOCK(inp); 1700 return (ECONNRESET); 1701 } 1702 } else if (sopt->sopt_name == TCP_FUNCTION_BLK) { 1703 /* 1704 * Protect the TCP option TCP_FUNCTION_BLK so 1705 * that a sub-function can *never* overwrite this. 1706 */ 1707 struct tcp_function_set fsn; 1708 struct tcp_function_block *blk; 1709 void *ptr = NULL; 1710 1711 INP_WUNLOCK(inp); 1712 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn); 1713 if (error) 1714 return (error); 1715 1716 INP_WLOCK(inp); 1717 tp = intotcpcb(inp); 1718 1719 blk = find_and_ref_tcp_functions(&fsn); 1720 if (blk == NULL) { 1721 INP_WUNLOCK(inp); 1722 return (ENOENT); 1723 } 1724 if (tp->t_fb == blk) { 1725 /* You already have this */ 1726 refcount_release(&blk->tfb_refcnt); 1727 INP_WUNLOCK(inp); 1728 return (0); 1729 } 1730 if (tp->t_state != TCPS_CLOSED) { 1731 /* 1732 * The user has advanced the state 1733 * past the initial point, we may not 1734 * be able to switch. 1735 */ 1736 if (blk->tfb_tcp_handoff_ok != NULL) { 1737 /* 1738 * Does the stack provide a 1739 * query mechanism, if so it may 1740 * still be possible? 1741 */ 1742 error = (*blk->tfb_tcp_handoff_ok)(tp); 1743 } else 1744 error = EINVAL; 1745 if (error) { 1746 refcount_release(&blk->tfb_refcnt); 1747 INP_WUNLOCK(inp); 1748 return(error); 1749 } 1750 } 1751 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1752 refcount_release(&blk->tfb_refcnt); 1753 INP_WUNLOCK(inp); 1754 return (ENOENT); 1755 } 1756 /* 1757 * Ensure the new stack takes ownership with a 1758 * clean slate on peak rate threshold. 1759 */ 1760 #ifdef TCPHPTS 1761 /* Assure that we are not on any hpts */ 1762 tcp_hpts_remove(tp); 1763 #endif 1764 if (blk->tfb_tcp_fb_init) { 1765 error = (*blk->tfb_tcp_fb_init)(tp, &ptr); 1766 if (error) { 1767 /* 1768 * Release the ref count the lookup 1769 * acquired. 1770 */ 1771 refcount_release(&blk->tfb_refcnt); 1772 /* 1773 * Now there is a chance that the 1774 * init() function mucked with some 1775 * things before it failed, such as 1776 * hpts or inp_flags2 or timer granularity. 1777 * It should not of, but lets give the old 1778 * stack a chance to reset to a known good state. 1779 */ 1780 if (tp->t_fb->tfb_switch_failed) { 1781 (*tp->t_fb->tfb_switch_failed)(tp); 1782 } 1783 goto err_out; 1784 } 1785 } 1786 if (tp->t_fb->tfb_tcp_fb_fini) { 1787 struct epoch_tracker et; 1788 /* 1789 * Tell the stack to cleanup with 0 i.e. 1790 * the tcb is not going away. 1791 */ 1792 NET_EPOCH_ENTER(et); 1793 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1794 NET_EPOCH_EXIT(et); 1795 } 1796 /* 1797 * Release the old refcnt, the 1798 * lookup acquired a ref on the 1799 * new one already. 1800 */ 1801 refcount_release(&tp->t_fb->tfb_refcnt); 1802 /* 1803 * Set in the new stack. 1804 */ 1805 tp->t_fb = blk; 1806 tp->t_fb_ptr = ptr; 1807 #ifdef TCP_OFFLOAD 1808 if (tp->t_flags & TF_TOE) { 1809 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1810 sopt->sopt_name); 1811 } 1812 #endif 1813 err_out: 1814 INP_WUNLOCK(inp); 1815 return (error); 1816 1817 } 1818 1819 /* Pass in the INP locked, callee must unlock it. */ 1820 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt)); 1821 } 1822 1823 static int 1824 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt) 1825 { 1826 struct socket *so = inp->inp_socket; 1827 struct tcpcb *tp = intotcpcb(inp); 1828 int error = 0; 1829 1830 MPASS(sopt->sopt_dir == SOPT_GET); 1831 INP_WLOCK_ASSERT(inp); 1832 KASSERT((inp->inp_flags & INP_DROPPED) == 0, 1833 ("inp_flags == %x", inp->inp_flags)); 1834 KASSERT(so != NULL, ("inp_socket == NULL")); 1835 1836 if (sopt->sopt_level != IPPROTO_TCP) { 1837 INP_WUNLOCK(inp); 1838 #ifdef INET6 1839 if (inp->inp_vflag & INP_IPV6PROTO) 1840 error = ip6_ctloutput(so, sopt); 1841 #endif /* INET6 */ 1842 #if defined(INET6) && defined(INET) 1843 else 1844 #endif 1845 #ifdef INET 1846 error = ip_ctloutput(so, sopt); 1847 #endif 1848 return (error); 1849 } 1850 if (((sopt->sopt_name == TCP_FUNCTION_BLK) || 1851 (sopt->sopt_name == TCP_FUNCTION_ALIAS))) { 1852 struct tcp_function_set fsn; 1853 1854 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) { 1855 memset(&fsn, 0, sizeof(fsn)); 1856 find_tcp_function_alias(tp->t_fb, &fsn); 1857 } else { 1858 strncpy(fsn.function_set_name, 1859 tp->t_fb->tfb_tcp_block_name, 1860 TCP_FUNCTION_NAME_LEN_MAX); 1861 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1862 } 1863 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1864 INP_WUNLOCK(inp); 1865 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1866 return (error); 1867 } 1868 1869 /* Pass in the INP locked, callee must unlock it. */ 1870 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt)); 1871 } 1872 1873 int 1874 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1875 { 1876 struct inpcb *inp; 1877 1878 inp = sotoinpcb(so); 1879 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1880 1881 INP_WLOCK(inp); 1882 if (inp->inp_flags & INP_DROPPED) { 1883 INP_WUNLOCK(inp); 1884 return (ECONNRESET); 1885 } 1886 if (sopt->sopt_dir == SOPT_SET) 1887 return (tcp_ctloutput_set(inp, sopt)); 1888 else if (sopt->sopt_dir == SOPT_GET) 1889 return (tcp_ctloutput_get(inp, sopt)); 1890 else 1891 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir); 1892 } 1893 1894 /* 1895 * If this assert becomes untrue, we need to change the size of the buf 1896 * variable in tcp_default_ctloutput(). 1897 */ 1898 #ifdef CTASSERT 1899 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1900 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1901 #endif 1902 1903 #ifdef KERN_TLS 1904 static int 1905 copyin_tls_enable(struct sockopt *sopt, struct tls_enable *tls) 1906 { 1907 struct tls_enable_v0 tls_v0; 1908 int error; 1909 1910 if (sopt->sopt_valsize == sizeof(tls_v0)) { 1911 error = sooptcopyin(sopt, &tls_v0, sizeof(tls_v0), 1912 sizeof(tls_v0)); 1913 if (error) 1914 return (error); 1915 memset(tls, 0, sizeof(*tls)); 1916 tls->cipher_key = tls_v0.cipher_key; 1917 tls->iv = tls_v0.iv; 1918 tls->auth_key = tls_v0.auth_key; 1919 tls->cipher_algorithm = tls_v0.cipher_algorithm; 1920 tls->cipher_key_len = tls_v0.cipher_key_len; 1921 tls->iv_len = tls_v0.iv_len; 1922 tls->auth_algorithm = tls_v0.auth_algorithm; 1923 tls->auth_key_len = tls_v0.auth_key_len; 1924 tls->flags = tls_v0.flags; 1925 tls->tls_vmajor = tls_v0.tls_vmajor; 1926 tls->tls_vminor = tls_v0.tls_vminor; 1927 return (0); 1928 } 1929 1930 return (sooptcopyin(sopt, tls, sizeof(*tls), sizeof(*tls))); 1931 } 1932 #endif 1933 1934 extern struct cc_algo newreno_cc_algo; 1935 1936 static int 1937 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt) 1938 { 1939 struct cc_algo *algo; 1940 void *ptr = NULL; 1941 struct tcpcb *tp; 1942 struct cc_var cc_mem; 1943 char buf[TCP_CA_NAME_MAX]; 1944 size_t mem_sz; 1945 int error; 1946 1947 INP_WUNLOCK(inp); 1948 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1949 if (error) 1950 return(error); 1951 buf[sopt->sopt_valsize] = '\0'; 1952 CC_LIST_RLOCK(); 1953 STAILQ_FOREACH(algo, &cc_list, entries) { 1954 if (strncmp(buf, algo->name, 1955 TCP_CA_NAME_MAX) == 0) { 1956 if (algo->flags & CC_MODULE_BEING_REMOVED) { 1957 /* We can't "see" modules being unloaded */ 1958 continue; 1959 } 1960 break; 1961 } 1962 } 1963 if (algo == NULL) { 1964 CC_LIST_RUNLOCK(); 1965 return(ESRCH); 1966 } 1967 /* 1968 * With a reference the algorithm cannot be removed 1969 * so we hold a reference through the change process. 1970 */ 1971 cc_refer(algo); 1972 CC_LIST_RUNLOCK(); 1973 if (algo->cb_init != NULL) { 1974 /* We can now pre-get the memory for the CC */ 1975 mem_sz = (*algo->cc_data_sz)(); 1976 if (mem_sz == 0) { 1977 goto no_mem_needed; 1978 } 1979 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK); 1980 } else { 1981 no_mem_needed: 1982 mem_sz = 0; 1983 ptr = NULL; 1984 } 1985 /* 1986 * Make sure its all clean and zero and also get 1987 * back the inplock. 1988 */ 1989 memset(&cc_mem, 0, sizeof(cc_mem)); 1990 INP_WLOCK(inp); 1991 if (inp->inp_flags & INP_DROPPED) { 1992 INP_WUNLOCK(inp); 1993 if (ptr) 1994 free(ptr, M_CC_MEM); 1995 /* Release our temp reference */ 1996 CC_LIST_RLOCK(); 1997 cc_release(algo); 1998 CC_LIST_RUNLOCK(); 1999 return (ECONNRESET); 2000 } 2001 tp = intotcpcb(inp); 2002 if (ptr != NULL) 2003 memset(ptr, 0, mem_sz); 2004 cc_mem.ccvc.tcp = tp; 2005 /* 2006 * We once again hold a write lock over the tcb so it's 2007 * safe to do these things without ordering concerns. 2008 * Note here we init into stack memory. 2009 */ 2010 if (algo->cb_init != NULL) 2011 error = algo->cb_init(&cc_mem, ptr); 2012 else 2013 error = 0; 2014 /* 2015 * The CC algorithms, when given their memory 2016 * should not fail we could in theory have a 2017 * KASSERT here. 2018 */ 2019 if (error == 0) { 2020 /* 2021 * Touchdown, lets go ahead and move the 2022 * connection to the new CC module by 2023 * copying in the cc_mem after we call 2024 * the old ones cleanup (if any). 2025 */ 2026 if (CC_ALGO(tp)->cb_destroy != NULL) 2027 CC_ALGO(tp)->cb_destroy(&tp->t_ccv); 2028 /* Detach the old CC from the tcpcb */ 2029 cc_detach(tp); 2030 /* Copy in our temp memory that was inited */ 2031 memcpy(&tp->t_ccv, &cc_mem, sizeof(struct cc_var)); 2032 /* Now attach the new, which takes a reference */ 2033 cc_attach(tp, algo); 2034 /* Ok now are we where we have gotten past any conn_init? */ 2035 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) { 2036 /* Yep run the connection init for the new CC */ 2037 CC_ALGO(tp)->conn_init(&tp->t_ccv); 2038 } 2039 } else if (ptr) 2040 free(ptr, M_CC_MEM); 2041 INP_WUNLOCK(inp); 2042 /* Now lets release our temp reference */ 2043 CC_LIST_RLOCK(); 2044 cc_release(algo); 2045 CC_LIST_RUNLOCK(); 2046 return (error); 2047 } 2048 2049 int 2050 tcp_default_ctloutput(struct tcpcb *tp, struct sockopt *sopt) 2051 { 2052 struct inpcb *inp = tptoinpcb(tp); 2053 int error, opt, optval; 2054 u_int ui; 2055 struct tcp_info ti; 2056 #ifdef KERN_TLS 2057 struct tls_enable tls; 2058 struct socket *so = inp->inp_socket; 2059 #endif 2060 char *pbuf, buf[TCP_LOG_ID_LEN]; 2061 #ifdef STATS 2062 struct statsblob *sbp; 2063 #endif 2064 size_t len; 2065 2066 INP_WLOCK_ASSERT(inp); 2067 KASSERT((inp->inp_flags & INP_DROPPED) == 0, 2068 ("inp_flags == %x", inp->inp_flags)); 2069 KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL")); 2070 2071 switch (sopt->sopt_level) { 2072 #ifdef INET6 2073 case IPPROTO_IPV6: 2074 MPASS(inp->inp_vflag & INP_IPV6PROTO); 2075 switch (sopt->sopt_name) { 2076 case IPV6_USE_MIN_MTU: 2077 tcp6_use_min_mtu(tp); 2078 /* FALLTHROUGH */ 2079 } 2080 INP_WUNLOCK(inp); 2081 return (0); 2082 #endif 2083 #ifdef INET 2084 case IPPROTO_IP: 2085 INP_WUNLOCK(inp); 2086 return (0); 2087 #endif 2088 } 2089 2090 /* 2091 * For TCP_CCALGOOPT forward the control to CC module, for both 2092 * SOPT_SET and SOPT_GET. 2093 */ 2094 switch (sopt->sopt_name) { 2095 case TCP_CCALGOOPT: 2096 INP_WUNLOCK(inp); 2097 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 2098 return (EINVAL); 2099 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 2100 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 2101 sopt->sopt_valsize); 2102 if (error) { 2103 free(pbuf, M_TEMP); 2104 return (error); 2105 } 2106 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 2107 if (CC_ALGO(tp)->ctl_output != NULL) 2108 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, sopt, pbuf); 2109 else 2110 error = ENOENT; 2111 INP_WUNLOCK(inp); 2112 if (error == 0 && sopt->sopt_dir == SOPT_GET) 2113 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 2114 free(pbuf, M_TEMP); 2115 return (error); 2116 } 2117 2118 switch (sopt->sopt_dir) { 2119 case SOPT_SET: 2120 switch (sopt->sopt_name) { 2121 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2122 case TCP_MD5SIG: 2123 INP_WUNLOCK(inp); 2124 if (!TCPMD5_ENABLED()) 2125 return (ENOPROTOOPT); 2126 error = TCPMD5_PCBCTL(inp, sopt); 2127 if (error) 2128 return (error); 2129 INP_WLOCK_RECHECK(inp); 2130 goto unlock_and_done; 2131 #endif /* IPSEC */ 2132 2133 case TCP_NODELAY: 2134 case TCP_NOOPT: 2135 case TCP_LRD: 2136 INP_WUNLOCK(inp); 2137 error = sooptcopyin(sopt, &optval, sizeof optval, 2138 sizeof optval); 2139 if (error) 2140 return (error); 2141 2142 INP_WLOCK_RECHECK(inp); 2143 switch (sopt->sopt_name) { 2144 case TCP_NODELAY: 2145 opt = TF_NODELAY; 2146 break; 2147 case TCP_NOOPT: 2148 opt = TF_NOOPT; 2149 break; 2150 case TCP_LRD: 2151 opt = TF_LRD; 2152 break; 2153 default: 2154 opt = 0; /* dead code to fool gcc */ 2155 break; 2156 } 2157 2158 if (optval) 2159 tp->t_flags |= opt; 2160 else 2161 tp->t_flags &= ~opt; 2162 unlock_and_done: 2163 #ifdef TCP_OFFLOAD 2164 if (tp->t_flags & TF_TOE) { 2165 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2166 sopt->sopt_name); 2167 } 2168 #endif 2169 INP_WUNLOCK(inp); 2170 break; 2171 2172 case TCP_NOPUSH: 2173 INP_WUNLOCK(inp); 2174 error = sooptcopyin(sopt, &optval, sizeof optval, 2175 sizeof optval); 2176 if (error) 2177 return (error); 2178 2179 INP_WLOCK_RECHECK(inp); 2180 if (optval) 2181 tp->t_flags |= TF_NOPUSH; 2182 else if (tp->t_flags & TF_NOPUSH) { 2183 tp->t_flags &= ~TF_NOPUSH; 2184 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2185 struct epoch_tracker et; 2186 2187 NET_EPOCH_ENTER(et); 2188 error = tcp_output_nodrop(tp); 2189 NET_EPOCH_EXIT(et); 2190 } 2191 } 2192 goto unlock_and_done; 2193 2194 case TCP_REMOTE_UDP_ENCAPS_PORT: 2195 INP_WUNLOCK(inp); 2196 error = sooptcopyin(sopt, &optval, sizeof optval, 2197 sizeof optval); 2198 if (error) 2199 return (error); 2200 if ((optval < TCP_TUNNELING_PORT_MIN) || 2201 (optval > TCP_TUNNELING_PORT_MAX)) { 2202 /* Its got to be in range */ 2203 return (EINVAL); 2204 } 2205 if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) { 2206 /* You have to have enabled a UDP tunneling port first */ 2207 return (EINVAL); 2208 } 2209 INP_WLOCK_RECHECK(inp); 2210 if (tp->t_state != TCPS_CLOSED) { 2211 /* You can't change after you are connected */ 2212 error = EINVAL; 2213 } else { 2214 /* Ok we are all good set the port */ 2215 tp->t_port = htons(optval); 2216 } 2217 goto unlock_and_done; 2218 2219 case TCP_MAXSEG: 2220 INP_WUNLOCK(inp); 2221 error = sooptcopyin(sopt, &optval, sizeof optval, 2222 sizeof optval); 2223 if (error) 2224 return (error); 2225 2226 INP_WLOCK_RECHECK(inp); 2227 if (optval > 0 && optval <= tp->t_maxseg && 2228 optval + 40 >= V_tcp_minmss) 2229 tp->t_maxseg = optval; 2230 else 2231 error = EINVAL; 2232 goto unlock_and_done; 2233 2234 case TCP_INFO: 2235 INP_WUNLOCK(inp); 2236 error = EINVAL; 2237 break; 2238 2239 case TCP_STATS: 2240 INP_WUNLOCK(inp); 2241 #ifdef STATS 2242 error = sooptcopyin(sopt, &optval, sizeof optval, 2243 sizeof optval); 2244 if (error) 2245 return (error); 2246 2247 if (optval > 0) 2248 sbp = stats_blob_alloc( 2249 V_tcp_perconn_stats_dflt_tpl, 0); 2250 else 2251 sbp = NULL; 2252 2253 INP_WLOCK_RECHECK(inp); 2254 if ((tp->t_stats != NULL && sbp == NULL) || 2255 (tp->t_stats == NULL && sbp != NULL)) { 2256 struct statsblob *t = tp->t_stats; 2257 tp->t_stats = sbp; 2258 sbp = t; 2259 } 2260 INP_WUNLOCK(inp); 2261 2262 stats_blob_destroy(sbp); 2263 #else 2264 return (EOPNOTSUPP); 2265 #endif /* !STATS */ 2266 break; 2267 2268 case TCP_CONGESTION: 2269 error = tcp_set_cc_mod(inp, sopt); 2270 break; 2271 2272 case TCP_REUSPORT_LB_NUMA: 2273 INP_WUNLOCK(inp); 2274 error = sooptcopyin(sopt, &optval, sizeof(optval), 2275 sizeof(optval)); 2276 INP_WLOCK_RECHECK(inp); 2277 if (!error) 2278 error = in_pcblbgroup_numa(inp, optval); 2279 INP_WUNLOCK(inp); 2280 break; 2281 2282 #ifdef KERN_TLS 2283 case TCP_TXTLS_ENABLE: 2284 INP_WUNLOCK(inp); 2285 error = copyin_tls_enable(sopt, &tls); 2286 if (error) 2287 break; 2288 error = ktls_enable_tx(so, &tls); 2289 break; 2290 case TCP_TXTLS_MODE: 2291 INP_WUNLOCK(inp); 2292 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2293 if (error) 2294 return (error); 2295 2296 INP_WLOCK_RECHECK(inp); 2297 error = ktls_set_tx_mode(so, ui); 2298 INP_WUNLOCK(inp); 2299 break; 2300 case TCP_RXTLS_ENABLE: 2301 INP_WUNLOCK(inp); 2302 error = sooptcopyin(sopt, &tls, sizeof(tls), 2303 sizeof(tls)); 2304 if (error) 2305 break; 2306 error = ktls_enable_rx(so, &tls); 2307 break; 2308 #endif 2309 case TCP_MAXUNACKTIME: 2310 case TCP_KEEPIDLE: 2311 case TCP_KEEPINTVL: 2312 case TCP_KEEPINIT: 2313 INP_WUNLOCK(inp); 2314 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2315 if (error) 2316 return (error); 2317 2318 if (ui > (UINT_MAX / hz)) { 2319 error = EINVAL; 2320 break; 2321 } 2322 ui *= hz; 2323 2324 INP_WLOCK_RECHECK(inp); 2325 switch (sopt->sopt_name) { 2326 case TCP_MAXUNACKTIME: 2327 tp->t_maxunacktime = ui; 2328 break; 2329 2330 case TCP_KEEPIDLE: 2331 tp->t_keepidle = ui; 2332 /* 2333 * XXX: better check current remaining 2334 * timeout and "merge" it with new value. 2335 */ 2336 if ((tp->t_state > TCPS_LISTEN) && 2337 (tp->t_state <= TCPS_CLOSING)) 2338 tcp_timer_activate(tp, TT_KEEP, 2339 TP_KEEPIDLE(tp)); 2340 break; 2341 case TCP_KEEPINTVL: 2342 tp->t_keepintvl = ui; 2343 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2344 (TP_MAXIDLE(tp) > 0)) 2345 tcp_timer_activate(tp, TT_2MSL, 2346 TP_MAXIDLE(tp)); 2347 break; 2348 case TCP_KEEPINIT: 2349 tp->t_keepinit = ui; 2350 if (tp->t_state == TCPS_SYN_RECEIVED || 2351 tp->t_state == TCPS_SYN_SENT) 2352 tcp_timer_activate(tp, TT_KEEP, 2353 TP_KEEPINIT(tp)); 2354 break; 2355 } 2356 goto unlock_and_done; 2357 2358 case TCP_KEEPCNT: 2359 INP_WUNLOCK(inp); 2360 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2361 if (error) 2362 return (error); 2363 2364 INP_WLOCK_RECHECK(inp); 2365 tp->t_keepcnt = ui; 2366 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2367 (TP_MAXIDLE(tp) > 0)) 2368 tcp_timer_activate(tp, TT_2MSL, 2369 TP_MAXIDLE(tp)); 2370 goto unlock_and_done; 2371 2372 #ifdef TCPPCAP 2373 case TCP_PCAP_OUT: 2374 case TCP_PCAP_IN: 2375 INP_WUNLOCK(inp); 2376 error = sooptcopyin(sopt, &optval, sizeof optval, 2377 sizeof optval); 2378 if (error) 2379 return (error); 2380 2381 INP_WLOCK_RECHECK(inp); 2382 if (optval >= 0) 2383 tcp_pcap_set_sock_max( 2384 (sopt->sopt_name == TCP_PCAP_OUT) ? 2385 &(tp->t_outpkts) : &(tp->t_inpkts), 2386 optval); 2387 else 2388 error = EINVAL; 2389 goto unlock_and_done; 2390 #endif 2391 2392 case TCP_FASTOPEN: { 2393 struct tcp_fastopen tfo_optval; 2394 2395 INP_WUNLOCK(inp); 2396 if (!V_tcp_fastopen_client_enable && 2397 !V_tcp_fastopen_server_enable) 2398 return (EPERM); 2399 2400 error = sooptcopyin(sopt, &tfo_optval, 2401 sizeof(tfo_optval), sizeof(int)); 2402 if (error) 2403 return (error); 2404 2405 INP_WLOCK_RECHECK(inp); 2406 if ((tp->t_state != TCPS_CLOSED) && 2407 (tp->t_state != TCPS_LISTEN)) { 2408 error = EINVAL; 2409 goto unlock_and_done; 2410 } 2411 if (tfo_optval.enable) { 2412 if (tp->t_state == TCPS_LISTEN) { 2413 if (!V_tcp_fastopen_server_enable) { 2414 error = EPERM; 2415 goto unlock_and_done; 2416 } 2417 2418 if (tp->t_tfo_pending == NULL) 2419 tp->t_tfo_pending = 2420 tcp_fastopen_alloc_counter(); 2421 } else { 2422 /* 2423 * If a pre-shared key was provided, 2424 * stash it in the client cookie 2425 * field of the tcpcb for use during 2426 * connect. 2427 */ 2428 if (sopt->sopt_valsize == 2429 sizeof(tfo_optval)) { 2430 memcpy(tp->t_tfo_cookie.client, 2431 tfo_optval.psk, 2432 TCP_FASTOPEN_PSK_LEN); 2433 tp->t_tfo_client_cookie_len = 2434 TCP_FASTOPEN_PSK_LEN; 2435 } 2436 } 2437 tp->t_flags |= TF_FASTOPEN; 2438 } else 2439 tp->t_flags &= ~TF_FASTOPEN; 2440 goto unlock_and_done; 2441 } 2442 2443 #ifdef TCP_BLACKBOX 2444 case TCP_LOG: 2445 INP_WUNLOCK(inp); 2446 error = sooptcopyin(sopt, &optval, sizeof optval, 2447 sizeof optval); 2448 if (error) 2449 return (error); 2450 2451 INP_WLOCK_RECHECK(inp); 2452 error = tcp_log_state_change(tp, optval); 2453 goto unlock_and_done; 2454 2455 case TCP_LOGBUF: 2456 INP_WUNLOCK(inp); 2457 error = EINVAL; 2458 break; 2459 2460 case TCP_LOGID: 2461 INP_WUNLOCK(inp); 2462 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2463 if (error) 2464 break; 2465 buf[sopt->sopt_valsize] = '\0'; 2466 INP_WLOCK_RECHECK(inp); 2467 error = tcp_log_set_id(tp, buf); 2468 /* tcp_log_set_id() unlocks the INP. */ 2469 break; 2470 2471 case TCP_LOGDUMP: 2472 case TCP_LOGDUMPID: 2473 INP_WUNLOCK(inp); 2474 error = 2475 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2476 if (error) 2477 break; 2478 buf[sopt->sopt_valsize] = '\0'; 2479 INP_WLOCK_RECHECK(inp); 2480 if (sopt->sopt_name == TCP_LOGDUMP) { 2481 error = tcp_log_dump_tp_logbuf(tp, buf, 2482 M_WAITOK, true); 2483 INP_WUNLOCK(inp); 2484 } else { 2485 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2486 /* 2487 * tcp_log_dump_tp_bucket_logbufs() drops the 2488 * INP lock. 2489 */ 2490 } 2491 break; 2492 #endif 2493 2494 default: 2495 INP_WUNLOCK(inp); 2496 error = ENOPROTOOPT; 2497 break; 2498 } 2499 break; 2500 2501 case SOPT_GET: 2502 tp = intotcpcb(inp); 2503 switch (sopt->sopt_name) { 2504 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2505 case TCP_MD5SIG: 2506 INP_WUNLOCK(inp); 2507 if (!TCPMD5_ENABLED()) 2508 return (ENOPROTOOPT); 2509 error = TCPMD5_PCBCTL(inp, sopt); 2510 break; 2511 #endif 2512 2513 case TCP_NODELAY: 2514 optval = tp->t_flags & TF_NODELAY; 2515 INP_WUNLOCK(inp); 2516 error = sooptcopyout(sopt, &optval, sizeof optval); 2517 break; 2518 case TCP_MAXSEG: 2519 optval = tp->t_maxseg; 2520 INP_WUNLOCK(inp); 2521 error = sooptcopyout(sopt, &optval, sizeof optval); 2522 break; 2523 case TCP_REMOTE_UDP_ENCAPS_PORT: 2524 optval = ntohs(tp->t_port); 2525 INP_WUNLOCK(inp); 2526 error = sooptcopyout(sopt, &optval, sizeof optval); 2527 break; 2528 case TCP_NOOPT: 2529 optval = tp->t_flags & TF_NOOPT; 2530 INP_WUNLOCK(inp); 2531 error = sooptcopyout(sopt, &optval, sizeof optval); 2532 break; 2533 case TCP_NOPUSH: 2534 optval = tp->t_flags & TF_NOPUSH; 2535 INP_WUNLOCK(inp); 2536 error = sooptcopyout(sopt, &optval, sizeof optval); 2537 break; 2538 case TCP_INFO: 2539 tcp_fill_info(tp, &ti); 2540 INP_WUNLOCK(inp); 2541 error = sooptcopyout(sopt, &ti, sizeof ti); 2542 break; 2543 case TCP_STATS: 2544 { 2545 #ifdef STATS 2546 int nheld; 2547 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2548 2549 error = 0; 2550 socklen_t outsbsz = sopt->sopt_valsize; 2551 if (tp->t_stats == NULL) 2552 error = ENOENT; 2553 else if (outsbsz >= tp->t_stats->cursz) 2554 outsbsz = tp->t_stats->cursz; 2555 else if (outsbsz >= sizeof(struct statsblob)) 2556 outsbsz = sizeof(struct statsblob); 2557 else 2558 error = EINVAL; 2559 INP_WUNLOCK(inp); 2560 if (error) 2561 break; 2562 2563 sbp = sopt->sopt_val; 2564 nheld = atop(round_page(((vm_offset_t)sbp) + 2565 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2566 vm_page_t ma[nheld]; 2567 if (vm_fault_quick_hold_pages( 2568 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2569 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2570 nheld) < 0) { 2571 error = EFAULT; 2572 break; 2573 } 2574 2575 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2576 SIZEOF_MEMBER(struct statsblob, flags)))) 2577 goto unhold; 2578 2579 INP_WLOCK_RECHECK(inp); 2580 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2581 sbflags | SB_CLONE_USRDSTNOFAULT); 2582 INP_WUNLOCK(inp); 2583 sopt->sopt_valsize = outsbsz; 2584 unhold: 2585 vm_page_unhold_pages(ma, nheld); 2586 #else 2587 INP_WUNLOCK(inp); 2588 error = EOPNOTSUPP; 2589 #endif /* !STATS */ 2590 break; 2591 } 2592 case TCP_CONGESTION: 2593 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2594 INP_WUNLOCK(inp); 2595 error = sooptcopyout(sopt, buf, len + 1); 2596 break; 2597 case TCP_MAXUNACKTIME: 2598 case TCP_KEEPIDLE: 2599 case TCP_KEEPINTVL: 2600 case TCP_KEEPINIT: 2601 case TCP_KEEPCNT: 2602 switch (sopt->sopt_name) { 2603 case TCP_MAXUNACKTIME: 2604 ui = TP_MAXUNACKTIME(tp) / hz; 2605 break; 2606 case TCP_KEEPIDLE: 2607 ui = TP_KEEPIDLE(tp) / hz; 2608 break; 2609 case TCP_KEEPINTVL: 2610 ui = TP_KEEPINTVL(tp) / hz; 2611 break; 2612 case TCP_KEEPINIT: 2613 ui = TP_KEEPINIT(tp) / hz; 2614 break; 2615 case TCP_KEEPCNT: 2616 ui = TP_KEEPCNT(tp); 2617 break; 2618 } 2619 INP_WUNLOCK(inp); 2620 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2621 break; 2622 #ifdef TCPPCAP 2623 case TCP_PCAP_OUT: 2624 case TCP_PCAP_IN: 2625 optval = tcp_pcap_get_sock_max( 2626 (sopt->sopt_name == TCP_PCAP_OUT) ? 2627 &(tp->t_outpkts) : &(tp->t_inpkts)); 2628 INP_WUNLOCK(inp); 2629 error = sooptcopyout(sopt, &optval, sizeof optval); 2630 break; 2631 #endif 2632 case TCP_FASTOPEN: 2633 optval = tp->t_flags & TF_FASTOPEN; 2634 INP_WUNLOCK(inp); 2635 error = sooptcopyout(sopt, &optval, sizeof optval); 2636 break; 2637 #ifdef TCP_BLACKBOX 2638 case TCP_LOG: 2639 optval = tcp_get_bblog_state(tp); 2640 INP_WUNLOCK(inp); 2641 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2642 break; 2643 case TCP_LOGBUF: 2644 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2645 error = tcp_log_getlogbuf(sopt, tp); 2646 break; 2647 case TCP_LOGID: 2648 len = tcp_log_get_id(tp, buf); 2649 INP_WUNLOCK(inp); 2650 error = sooptcopyout(sopt, buf, len + 1); 2651 break; 2652 case TCP_LOGDUMP: 2653 case TCP_LOGDUMPID: 2654 INP_WUNLOCK(inp); 2655 error = EINVAL; 2656 break; 2657 #endif 2658 #ifdef KERN_TLS 2659 case TCP_TXTLS_MODE: 2660 error = ktls_get_tx_mode(so, &optval); 2661 INP_WUNLOCK(inp); 2662 if (error == 0) 2663 error = sooptcopyout(sopt, &optval, 2664 sizeof(optval)); 2665 break; 2666 case TCP_RXTLS_MODE: 2667 error = ktls_get_rx_mode(so, &optval); 2668 INP_WUNLOCK(inp); 2669 if (error == 0) 2670 error = sooptcopyout(sopt, &optval, 2671 sizeof(optval)); 2672 break; 2673 #endif 2674 case TCP_LRD: 2675 optval = tp->t_flags & TF_LRD; 2676 INP_WUNLOCK(inp); 2677 error = sooptcopyout(sopt, &optval, sizeof optval); 2678 break; 2679 default: 2680 INP_WUNLOCK(inp); 2681 error = ENOPROTOOPT; 2682 break; 2683 } 2684 break; 2685 } 2686 return (error); 2687 } 2688 #undef INP_WLOCK_RECHECK 2689 #undef INP_WLOCK_RECHECK_CLEANUP 2690 2691 /* 2692 * Initiate (or continue) disconnect. 2693 * If embryonic state, just send reset (once). 2694 * If in ``let data drain'' option and linger null, just drop. 2695 * Otherwise (hard), mark socket disconnecting and drop 2696 * current input data; switch states based on user close, and 2697 * send segment to peer (with FIN). 2698 */ 2699 static void 2700 tcp_disconnect(struct tcpcb *tp) 2701 { 2702 struct inpcb *inp = tptoinpcb(tp); 2703 struct socket *so = tptosocket(tp); 2704 2705 NET_EPOCH_ASSERT(); 2706 INP_WLOCK_ASSERT(inp); 2707 2708 /* 2709 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2710 * socket is still open. 2711 */ 2712 if (tp->t_state < TCPS_ESTABLISHED && 2713 !(tp->t_state > TCPS_LISTEN && IS_FASTOPEN(tp->t_flags))) { 2714 tp = tcp_close(tp); 2715 KASSERT(tp != NULL, 2716 ("tcp_disconnect: tcp_close() returned NULL")); 2717 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2718 tp = tcp_drop(tp, 0); 2719 KASSERT(tp != NULL, 2720 ("tcp_disconnect: tcp_drop() returned NULL")); 2721 } else { 2722 soisdisconnecting(so); 2723 sbflush(&so->so_rcv); 2724 tcp_usrclosed(tp); 2725 if (!(inp->inp_flags & INP_DROPPED)) 2726 /* Ignore stack's drop request, we already at it. */ 2727 (void)tcp_output_nodrop(tp); 2728 } 2729 } 2730 2731 /* 2732 * User issued close, and wish to trail through shutdown states: 2733 * if never received SYN, just forget it. If got a SYN from peer, 2734 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2735 * If already got a FIN from peer, then almost done; go to LAST_ACK 2736 * state. In all other cases, have already sent FIN to peer (e.g. 2737 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2738 * for peer to send FIN or not respond to keep-alives, etc. 2739 * We can let the user exit from the close as soon as the FIN is acked. 2740 */ 2741 static void 2742 tcp_usrclosed(struct tcpcb *tp) 2743 { 2744 2745 NET_EPOCH_ASSERT(); 2746 INP_WLOCK_ASSERT(tptoinpcb(tp)); 2747 2748 switch (tp->t_state) { 2749 case TCPS_LISTEN: 2750 #ifdef TCP_OFFLOAD 2751 tcp_offload_listen_stop(tp); 2752 #endif 2753 tcp_state_change(tp, TCPS_CLOSED); 2754 /* FALLTHROUGH */ 2755 case TCPS_CLOSED: 2756 tp = tcp_close(tp); 2757 /* 2758 * tcp_close() should never return NULL here as the socket is 2759 * still open. 2760 */ 2761 KASSERT(tp != NULL, 2762 ("tcp_usrclosed: tcp_close() returned NULL")); 2763 break; 2764 2765 case TCPS_SYN_SENT: 2766 case TCPS_SYN_RECEIVED: 2767 tp->t_flags |= TF_NEEDFIN; 2768 break; 2769 2770 case TCPS_ESTABLISHED: 2771 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2772 break; 2773 2774 case TCPS_CLOSE_WAIT: 2775 tcp_state_change(tp, TCPS_LAST_ACK); 2776 break; 2777 } 2778 if (tp->t_acktime == 0) 2779 tp->t_acktime = ticks; 2780 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2781 soisdisconnected(tptosocket(tp)); 2782 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2783 if (tp->t_state == TCPS_FIN_WAIT_2) { 2784 int timeout; 2785 2786 timeout = (tcp_fast_finwait2_recycle) ? 2787 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2788 tcp_timer_activate(tp, TT_2MSL, timeout); 2789 } 2790 } 2791 } 2792 2793 #ifdef DDB 2794 static void 2795 db_print_indent(int indent) 2796 { 2797 int i; 2798 2799 for (i = 0; i < indent; i++) 2800 db_printf(" "); 2801 } 2802 2803 static void 2804 db_print_tstate(int t_state) 2805 { 2806 2807 switch (t_state) { 2808 case TCPS_CLOSED: 2809 db_printf("TCPS_CLOSED"); 2810 return; 2811 2812 case TCPS_LISTEN: 2813 db_printf("TCPS_LISTEN"); 2814 return; 2815 2816 case TCPS_SYN_SENT: 2817 db_printf("TCPS_SYN_SENT"); 2818 return; 2819 2820 case TCPS_SYN_RECEIVED: 2821 db_printf("TCPS_SYN_RECEIVED"); 2822 return; 2823 2824 case TCPS_ESTABLISHED: 2825 db_printf("TCPS_ESTABLISHED"); 2826 return; 2827 2828 case TCPS_CLOSE_WAIT: 2829 db_printf("TCPS_CLOSE_WAIT"); 2830 return; 2831 2832 case TCPS_FIN_WAIT_1: 2833 db_printf("TCPS_FIN_WAIT_1"); 2834 return; 2835 2836 case TCPS_CLOSING: 2837 db_printf("TCPS_CLOSING"); 2838 return; 2839 2840 case TCPS_LAST_ACK: 2841 db_printf("TCPS_LAST_ACK"); 2842 return; 2843 2844 case TCPS_FIN_WAIT_2: 2845 db_printf("TCPS_FIN_WAIT_2"); 2846 return; 2847 2848 case TCPS_TIME_WAIT: 2849 db_printf("TCPS_TIME_WAIT"); 2850 return; 2851 2852 default: 2853 db_printf("unknown"); 2854 return; 2855 } 2856 } 2857 2858 static void 2859 db_print_tflags(u_int t_flags) 2860 { 2861 int comma; 2862 2863 comma = 0; 2864 if (t_flags & TF_ACKNOW) { 2865 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 2866 comma = 1; 2867 } 2868 if (t_flags & TF_DELACK) { 2869 db_printf("%sTF_DELACK", comma ? ", " : ""); 2870 comma = 1; 2871 } 2872 if (t_flags & TF_NODELAY) { 2873 db_printf("%sTF_NODELAY", comma ? ", " : ""); 2874 comma = 1; 2875 } 2876 if (t_flags & TF_NOOPT) { 2877 db_printf("%sTF_NOOPT", comma ? ", " : ""); 2878 comma = 1; 2879 } 2880 if (t_flags & TF_SENTFIN) { 2881 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 2882 comma = 1; 2883 } 2884 if (t_flags & TF_REQ_SCALE) { 2885 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 2886 comma = 1; 2887 } 2888 if (t_flags & TF_RCVD_SCALE) { 2889 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 2890 comma = 1; 2891 } 2892 if (t_flags & TF_REQ_TSTMP) { 2893 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 2894 comma = 1; 2895 } 2896 if (t_flags & TF_RCVD_TSTMP) { 2897 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 2898 comma = 1; 2899 } 2900 if (t_flags & TF_SACK_PERMIT) { 2901 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 2902 comma = 1; 2903 } 2904 if (t_flags & TF_NEEDSYN) { 2905 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 2906 comma = 1; 2907 } 2908 if (t_flags & TF_NEEDFIN) { 2909 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 2910 comma = 1; 2911 } 2912 if (t_flags & TF_NOPUSH) { 2913 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 2914 comma = 1; 2915 } 2916 if (t_flags & TF_PREVVALID) { 2917 db_printf("%sTF_PREVVALID", comma ? ", " : ""); 2918 comma = 1; 2919 } 2920 if (t_flags & TF_MORETOCOME) { 2921 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 2922 comma = 1; 2923 } 2924 if (t_flags & TF_SONOTCONN) { 2925 db_printf("%sTF_SONOTCONN", comma ? ", " : ""); 2926 comma = 1; 2927 } 2928 if (t_flags & TF_LASTIDLE) { 2929 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 2930 comma = 1; 2931 } 2932 if (t_flags & TF_RXWIN0SENT) { 2933 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 2934 comma = 1; 2935 } 2936 if (t_flags & TF_FASTRECOVERY) { 2937 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 2938 comma = 1; 2939 } 2940 if (t_flags & TF_CONGRECOVERY) { 2941 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 2942 comma = 1; 2943 } 2944 if (t_flags & TF_WASFRECOVERY) { 2945 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 2946 comma = 1; 2947 } 2948 if (t_flags & TF_WASCRECOVERY) { 2949 db_printf("%sTF_WASCRECOVERY", comma ? ", " : ""); 2950 comma = 1; 2951 } 2952 if (t_flags & TF_SIGNATURE) { 2953 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 2954 comma = 1; 2955 } 2956 if (t_flags & TF_FORCEDATA) { 2957 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 2958 comma = 1; 2959 } 2960 if (t_flags & TF_TSO) { 2961 db_printf("%sTF_TSO", comma ? ", " : ""); 2962 comma = 1; 2963 } 2964 if (t_flags & TF_FASTOPEN) { 2965 db_printf("%sTF_FASTOPEN", comma ? ", " : ""); 2966 comma = 1; 2967 } 2968 } 2969 2970 static void 2971 db_print_tflags2(u_int t_flags2) 2972 { 2973 int comma; 2974 2975 comma = 0; 2976 if (t_flags2 & TF2_PLPMTU_BLACKHOLE) { 2977 db_printf("%sTF2_PLPMTU_BLACKHOLE", comma ? ", " : ""); 2978 comma = 1; 2979 } 2980 if (t_flags2 & TF2_PLPMTU_PMTUD) { 2981 db_printf("%sTF2_PLPMTU_PMTUD", comma ? ", " : ""); 2982 comma = 1; 2983 } 2984 if (t_flags2 & TF2_PLPMTU_MAXSEGSNT) { 2985 db_printf("%sTF2_PLPMTU_MAXSEGSNT", comma ? ", " : ""); 2986 comma = 1; 2987 } 2988 if (t_flags2 & TF2_LOG_AUTO) { 2989 db_printf("%sTF2_LOG_AUTO", comma ? ", " : ""); 2990 comma = 1; 2991 } 2992 if (t_flags2 & TF2_DROP_AF_DATA) { 2993 db_printf("%sTF2_DROP_AF_DATA", comma ? ", " : ""); 2994 comma = 1; 2995 } 2996 if (t_flags2 & TF2_ECN_PERMIT) { 2997 db_printf("%sTF2_ECN_PERMIT", comma ? ", " : ""); 2998 comma = 1; 2999 } 3000 if (t_flags2 & TF2_ECN_SND_CWR) { 3001 db_printf("%sTF2_ECN_SND_CWR", comma ? ", " : ""); 3002 comma = 1; 3003 } 3004 if (t_flags2 & TF2_ECN_SND_ECE) { 3005 db_printf("%sTF2_ECN_SND_ECE", comma ? ", " : ""); 3006 comma = 1; 3007 } 3008 if (t_flags2 & TF2_ACE_PERMIT) { 3009 db_printf("%sTF2_ACE_PERMIT", comma ? ", " : ""); 3010 comma = 1; 3011 } 3012 if (t_flags2 & TF2_FBYTES_COMPLETE) { 3013 db_printf("%sTF2_FBYTES_COMPLETE", comma ? ", " : ""); 3014 comma = 1; 3015 } 3016 } 3017 3018 static void 3019 db_print_toobflags(char t_oobflags) 3020 { 3021 int comma; 3022 3023 comma = 0; 3024 if (t_oobflags & TCPOOB_HAVEDATA) { 3025 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 3026 comma = 1; 3027 } 3028 if (t_oobflags & TCPOOB_HADDATA) { 3029 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 3030 comma = 1; 3031 } 3032 } 3033 3034 static void 3035 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 3036 { 3037 3038 db_print_indent(indent); 3039 db_printf("%s at %p\n", name, tp); 3040 3041 indent += 2; 3042 3043 db_print_indent(indent); 3044 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 3045 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 3046 3047 db_print_indent(indent); 3048 db_printf("t_callout: %p t_timers: %p\n", 3049 &tp->t_callout, &tp->t_timers); 3050 3051 db_print_indent(indent); 3052 db_printf("t_state: %d (", tp->t_state); 3053 db_print_tstate(tp->t_state); 3054 db_printf(")\n"); 3055 3056 db_print_indent(indent); 3057 db_printf("t_flags: 0x%x (", tp->t_flags); 3058 db_print_tflags(tp->t_flags); 3059 db_printf(")\n"); 3060 3061 db_print_indent(indent); 3062 db_printf("t_flags2: 0x%x (", tp->t_flags2); 3063 db_print_tflags2(tp->t_flags2); 3064 db_printf(")\n"); 3065 3066 db_print_indent(indent); 3067 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: 0x%08x\n", 3068 tp->snd_una, tp->snd_max, tp->snd_nxt); 3069 3070 db_print_indent(indent); 3071 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 3072 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 3073 3074 db_print_indent(indent); 3075 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 3076 tp->iss, tp->irs, tp->rcv_nxt); 3077 3078 db_print_indent(indent); 3079 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 3080 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 3081 3082 db_print_indent(indent); 3083 db_printf("snd_wnd: %u snd_cwnd: %u\n", 3084 tp->snd_wnd, tp->snd_cwnd); 3085 3086 db_print_indent(indent); 3087 db_printf("snd_ssthresh: %u snd_recover: " 3088 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 3089 3090 db_print_indent(indent); 3091 db_printf("t_rcvtime: %u t_startime: %u\n", 3092 tp->t_rcvtime, tp->t_starttime); 3093 3094 db_print_indent(indent); 3095 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 3096 tp->t_rtttime, tp->t_rtseq); 3097 3098 db_print_indent(indent); 3099 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 3100 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 3101 3102 db_print_indent(indent); 3103 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u\n", 3104 tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin); 3105 3106 db_print_indent(indent); 3107 db_printf("t_rttupdated: %u max_sndwnd: %u t_softerror: %d\n", 3108 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 3109 3110 db_print_indent(indent); 3111 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 3112 db_print_toobflags(tp->t_oobflags); 3113 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 3114 3115 db_print_indent(indent); 3116 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 3117 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 3118 3119 db_print_indent(indent); 3120 db_printf("ts_recent: %u ts_recent_age: %u\n", 3121 tp->ts_recent, tp->ts_recent_age); 3122 3123 db_print_indent(indent); 3124 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 3125 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 3126 3127 db_print_indent(indent); 3128 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 3129 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 3130 tp->snd_recover_prev, tp->t_badrxtwin); 3131 3132 db_print_indent(indent); 3133 db_printf("snd_numholes: %d snd_holes first: %p\n", 3134 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 3135 3136 db_print_indent(indent); 3137 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 3138 tp->snd_fack, tp->rcv_numsacks); 3139 3140 /* Skip sackblks, sackhint. */ 3141 3142 db_print_indent(indent); 3143 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 3144 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 3145 } 3146 3147 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 3148 { 3149 struct tcpcb *tp; 3150 3151 if (!have_addr) { 3152 db_printf("usage: show tcpcb <addr>\n"); 3153 return; 3154 } 3155 tp = (struct tcpcb *)addr; 3156 3157 db_print_tcpcb(tp, "tcpcb", 0); 3158 } 3159 #endif 3160