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 38 #include "opt_ddb.h" 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 #include "opt_ipsec.h" 42 #include "opt_kern_tls.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/arb.h> 47 #include <sys/limits.h> 48 #include <sys/malloc.h> 49 #include <sys/refcount.h> 50 #include <sys/kernel.h> 51 #include <sys/ktls.h> 52 #include <sys/qmath.h> 53 #include <sys/sysctl.h> 54 #include <sys/mbuf.h> 55 #ifdef INET6 56 #include <sys/domain.h> 57 #endif /* INET6 */ 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/protosw.h> 61 #include <sys/proc.h> 62 #include <sys/jail.h> 63 #include <sys/stats.h> 64 65 #ifdef DDB 66 #include <ddb/ddb.h> 67 #endif 68 69 #include <net/if.h> 70 #include <net/if_var.h> 71 #include <net/route.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_kdtrace.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/in_rss.h> 78 #include <netinet/in_systm.h> 79 #include <netinet/in_var.h> 80 #include <netinet/ip.h> 81 #include <netinet/ip_var.h> 82 #ifdef INET6 83 #include <netinet/ip6.h> 84 #include <netinet6/in6_pcb.h> 85 #include <netinet6/in6_rss.h> 86 #include <netinet6/ip6_var.h> 87 #include <netinet6/scope6_var.h> 88 #endif 89 #include <netinet/tcp.h> 90 #include <netinet/tcp_fsm.h> 91 #include <netinet/tcp_seq.h> 92 #include <netinet/tcp_timer.h> 93 #include <netinet/tcp_var.h> 94 #include <netinet/tcp_log_buf.h> 95 #include <netinet/tcpip.h> 96 #include <netinet/cc/cc.h> 97 #include <netinet/tcp_fastopen.h> 98 #include <netinet/tcp_hpts.h> 99 #ifdef TCP_OFFLOAD 100 #include <netinet/tcp_offload.h> 101 #endif 102 #include <netipsec/ipsec_support.h> 103 104 #include <vm/vm.h> 105 #include <vm/vm_param.h> 106 #include <vm/pmap.h> 107 #include <vm/vm_extern.h> 108 #include <vm/vm_map.h> 109 #include <vm/vm_page.h> 110 111 /* 112 * TCP protocol interface to socket abstraction. 113 */ 114 #ifdef INET 115 static int tcp_connect(struct tcpcb *, struct sockaddr_in *, 116 struct thread *td); 117 #endif /* INET */ 118 #ifdef INET6 119 static int tcp6_connect(struct tcpcb *, struct sockaddr_in6 *, 120 struct thread *td); 121 #endif /* INET6 */ 122 static void tcp_disconnect(struct tcpcb *); 123 static void tcp_usrclosed(struct tcpcb *); 124 static void tcp_fill_info(const struct tcpcb *, struct tcp_info *); 125 126 static int tcp_pru_options_support(struct tcpcb *tp, int flags); 127 128 static void 129 tcp_bblog_pru(struct tcpcb *tp, uint32_t pru, int error) 130 { 131 struct tcp_log_buffer *lgb; 132 133 KASSERT(tp != NULL, ("tcp_bblog_pru: tp == NULL")); 134 INP_WLOCK_ASSERT(tptoinpcb(tp)); 135 if (tcp_bblogging_on(tp)) { 136 lgb = tcp_log_event(tp, NULL, NULL, NULL, TCP_LOG_PRU, error, 137 0, NULL, false, NULL, NULL, 0, NULL); 138 } else { 139 lgb = NULL; 140 } 141 if (lgb != NULL) { 142 if (error >= 0) { 143 lgb->tlb_errno = (uint32_t)error; 144 } 145 lgb->tlb_flex1 = pru; 146 } 147 } 148 149 /* 150 * TCP attaches to socket via pr_attach(), reserving space, 151 * and an internet control block. 152 */ 153 static int 154 tcp_usr_attach(struct socket *so, int proto, struct thread *td) 155 { 156 struct inpcb *inp; 157 struct tcpcb *tp = NULL; 158 int error; 159 160 inp = sotoinpcb(so); 161 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 162 163 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 164 if (error) 165 goto out; 166 167 so->so_rcv.sb_flags |= SB_AUTOSIZE; 168 so->so_snd.sb_flags |= (SB_AUTOLOWAT | SB_AUTOSIZE); 169 error = in_pcballoc(so, &V_tcbinfo); 170 if (error) 171 goto out; 172 inp = sotoinpcb(so); 173 tp = tcp_newtcpcb(inp, NULL); 174 if (tp == NULL) { 175 error = ENOBUFS; 176 in_pcbfree(inp); 177 goto out; 178 } 179 tp->t_state = TCPS_CLOSED; 180 tcp_bblog_pru(tp, PRU_ATTACH, error); 181 INP_WUNLOCK(inp); 182 TCPSTATES_INC(TCPS_CLOSED); 183 out: 184 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 185 return (error); 186 } 187 188 /* 189 * tcp_usr_detach is called when the socket layer loses its final reference 190 * to the socket, be it a file descriptor reference, a reference from TCP, 191 * etc. At this point, there is only one case in which we will keep around 192 * inpcb state: time wait. 193 */ 194 static void 195 tcp_usr_detach(struct socket *so) 196 { 197 struct inpcb *inp; 198 struct tcpcb *tp; 199 200 inp = sotoinpcb(so); 201 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 202 INP_WLOCK(inp); 203 KASSERT(so->so_pcb == inp && inp->inp_socket == so, 204 ("%s: socket %p inp %p mismatch", __func__, so, inp)); 205 206 tp = intotcpcb(inp); 207 208 KASSERT(tp->t_flags & TF_DISCONNECTED || 209 tp->t_state < TCPS_SYN_SENT, 210 ("%s: inp %p not disconnected or embryonic", __func__, inp)); 211 212 tcp_discardcb(tp); 213 in_pcbfree(inp); 214 } 215 216 #ifdef INET 217 /* 218 * Give the socket an address. 219 */ 220 static int 221 tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 222 { 223 struct inpcb *inp = sotoinpcb(so); 224 struct tcpcb *tp = intotcpcb(inp); 225 struct sockaddr_in *sinp; 226 int error = 0; 227 228 INP_WLOCK(inp); 229 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 230 INP_WUNLOCK(inp); 231 return (EINVAL); 232 } 233 234 sinp = (struct sockaddr_in *)nam; 235 if (nam->sa_family != AF_INET) { 236 /* 237 * Preserve compatibility with old programs. 238 */ 239 if (nam->sa_family != AF_UNSPEC || 240 nam->sa_len < offsetof(struct sockaddr_in, sin_zero) || 241 sinp->sin_addr.s_addr != INADDR_ANY) { 242 error = EAFNOSUPPORT; 243 goto out; 244 } 245 nam->sa_family = AF_INET; 246 } 247 if (nam->sa_len != sizeof(*sinp)) { 248 error = EINVAL; 249 goto out; 250 } 251 /* 252 * Must check for multicast addresses and disallow binding 253 * to them. 254 */ 255 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 256 error = EAFNOSUPPORT; 257 goto out; 258 } 259 error = in_pcbbind(inp, sinp, V_tcp_bind_all_fibs ? 0 : INPBIND_FIB, 260 td->td_ucred); 261 out: 262 tcp_bblog_pru(tp, PRU_BIND, error); 263 TCP_PROBE2(debug__user, tp, PRU_BIND); 264 INP_WUNLOCK(inp); 265 266 return (error); 267 } 268 #endif /* INET */ 269 270 #ifdef INET6 271 static int 272 tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 273 { 274 struct inpcb *inp = sotoinpcb(so); 275 struct tcpcb *tp = intotcpcb(inp); 276 struct sockaddr_in6 *sin6; 277 int error = 0; 278 u_char vflagsav; 279 280 INP_WLOCK(inp); 281 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 282 INP_WUNLOCK(inp); 283 return (EINVAL); 284 } 285 286 vflagsav = inp->inp_vflag; 287 288 sin6 = (struct sockaddr_in6 *)nam; 289 if (nam->sa_family != AF_INET6) { 290 error = EAFNOSUPPORT; 291 goto out; 292 } 293 if (nam->sa_len != sizeof(*sin6)) { 294 error = EINVAL; 295 goto out; 296 } 297 /* 298 * Must check for multicast addresses and disallow binding 299 * to them. 300 */ 301 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 302 error = EAFNOSUPPORT; 303 goto out; 304 } 305 306 inp->inp_vflag &= ~INP_IPV4; 307 inp->inp_vflag |= INP_IPV6; 308 #ifdef INET 309 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 310 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 311 inp->inp_vflag |= INP_IPV4; 312 else if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 313 struct sockaddr_in sin; 314 315 in6_sin6_2_sin(&sin, sin6); 316 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 317 error = EAFNOSUPPORT; 318 goto out; 319 } 320 inp->inp_vflag |= INP_IPV4; 321 inp->inp_vflag &= ~INP_IPV6; 322 error = in_pcbbind(inp, &sin, 0, td->td_ucred); 323 goto out; 324 } 325 } 326 #endif 327 error = in6_pcbbind(inp, sin6, V_tcp_bind_all_fibs ? 0 : INPBIND_FIB, 328 td->td_ucred); 329 out: 330 if (error != 0) 331 inp->inp_vflag = vflagsav; 332 tcp_bblog_pru(tp, PRU_BIND, error); 333 TCP_PROBE2(debug__user, tp, PRU_BIND); 334 INP_WUNLOCK(inp); 335 return (error); 336 } 337 #endif /* INET6 */ 338 339 #ifdef INET 340 /* 341 * Prepare to accept connections. 342 */ 343 static int 344 tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 345 { 346 struct inpcb *inp = sotoinpcb(so); 347 struct tcpcb *tp = intotcpcb(inp); 348 int error = 0; 349 bool already_listening; 350 351 INP_WLOCK(inp); 352 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 353 INP_WUNLOCK(inp); 354 return (EINVAL); 355 } 356 357 SOCK_LOCK(so); 358 already_listening = SOLISTENING(so); 359 error = solisten_proto_check(so); 360 if (error != 0) { 361 SOCK_UNLOCK(so); 362 goto out; 363 } 364 if (inp->inp_lport == 0) { 365 error = in_pcbbind(inp, NULL, 366 V_tcp_bind_all_fibs ? 0 : INPBIND_FIB, td->td_ucred); 367 } 368 if (error == 0) { 369 tcp_state_change(tp, TCPS_LISTEN); 370 solisten_proto(so, backlog); 371 #ifdef TCP_OFFLOAD 372 if ((so->so_options & SO_NO_OFFLOAD) == 0) 373 tcp_offload_listen_start(tp); 374 #endif 375 } else { 376 solisten_proto_abort(so); 377 } 378 SOCK_UNLOCK(so); 379 if (already_listening) 380 goto out; 381 382 if (error == 0) { 383 in_pcblisten(inp); 384 if (tp->t_flags & TF_FASTOPEN) 385 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 386 } 387 388 out: 389 tcp_bblog_pru(tp, PRU_LISTEN, error); 390 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 391 INP_WUNLOCK(inp); 392 return (error); 393 } 394 #endif /* INET */ 395 396 #ifdef INET6 397 static int 398 tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 399 { 400 struct inpcb *inp = sotoinpcb(so); 401 struct tcpcb *tp = intotcpcb(inp); 402 u_char vflagsav; 403 int error = 0; 404 bool already_listening; 405 406 INP_WLOCK(inp); 407 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 408 INP_WUNLOCK(inp); 409 return (EINVAL); 410 } 411 412 vflagsav = inp->inp_vflag; 413 414 SOCK_LOCK(so); 415 already_listening = SOLISTENING(so); 416 error = solisten_proto_check(so); 417 if (error != 0) { 418 SOCK_UNLOCK(so); 419 goto out; 420 } 421 if (inp->inp_lport == 0) { 422 inp->inp_vflag &= ~INP_IPV4; 423 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 424 inp->inp_vflag |= INP_IPV4; 425 error = in6_pcbbind(inp, NULL, 426 V_tcp_bind_all_fibs ? 0 : INPBIND_FIB, td->td_ucred); 427 } 428 if (error == 0) { 429 tcp_state_change(tp, TCPS_LISTEN); 430 solisten_proto(so, backlog); 431 #ifdef TCP_OFFLOAD 432 if ((so->so_options & SO_NO_OFFLOAD) == 0) 433 tcp_offload_listen_start(tp); 434 #endif 435 } else { 436 solisten_proto_abort(so); 437 } 438 SOCK_UNLOCK(so); 439 if (already_listening) 440 goto out; 441 442 if (error == 0) { 443 in_pcblisten(inp); 444 if (tp->t_flags & TF_FASTOPEN) 445 tp->t_tfo_pending = tcp_fastopen_alloc_counter(); 446 } else 447 inp->inp_vflag = vflagsav; 448 449 out: 450 tcp_bblog_pru(tp, PRU_LISTEN, error); 451 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 452 INP_WUNLOCK(inp); 453 return (error); 454 } 455 #endif /* INET6 */ 456 457 #ifdef INET 458 /* 459 * Initiate connection to peer. 460 * Create a template for use in transmissions on this connection. 461 * Enter SYN_SENT state, and mark socket as connecting. 462 * Start keep-alive timer, and seed output sequence space. 463 * Send initial segment on connection. 464 */ 465 static int 466 tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 467 { 468 struct epoch_tracker et; 469 struct inpcb *inp = sotoinpcb(so); 470 struct tcpcb *tp = intotcpcb(inp); 471 struct sockaddr_in *sinp; 472 int error = 0; 473 474 INP_WLOCK(inp); 475 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 476 INP_WUNLOCK(inp); 477 return (ECONNREFUSED); 478 } 479 480 sinp = (struct sockaddr_in *)nam; 481 if (nam->sa_family != AF_INET) { 482 error = EAFNOSUPPORT; 483 goto out; 484 } 485 if (nam->sa_len != sizeof (*sinp)) { 486 error = EINVAL; 487 goto out; 488 } 489 /* 490 * Must disallow TCP ``connections'' to multicast addresses. 491 */ 492 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 493 error = EAFNOSUPPORT; 494 goto out; 495 } 496 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 497 error = EACCES; 498 goto out; 499 } 500 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 501 goto out; 502 if (SOLISTENING(so)) { 503 error = EOPNOTSUPP; 504 goto out; 505 } 506 NET_EPOCH_ENTER(et); 507 if ((error = tcp_connect(tp, sinp, td)) != 0) 508 goto out_in_epoch; 509 #ifdef TCP_OFFLOAD 510 if (registered_toedevs > 0 && 511 (so->so_options & SO_NO_OFFLOAD) == 0 && 512 (error = tcp_offload_connect(so, nam)) == 0) 513 goto out_in_epoch; 514 #endif 515 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 516 error = tcp_output(tp); 517 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()" 518 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error)); 519 out_in_epoch: 520 NET_EPOCH_EXIT(et); 521 out: 522 tcp_bblog_pru(tp, PRU_CONNECT, error); 523 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 524 INP_WUNLOCK(inp); 525 return (error); 526 } 527 #endif /* INET */ 528 529 #ifdef INET6 530 static int 531 tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 532 { 533 struct epoch_tracker et; 534 struct inpcb *inp = sotoinpcb(so); 535 struct tcpcb *tp = intotcpcb(inp); 536 struct sockaddr_in6 *sin6; 537 int error = 0; 538 u_int8_t incflagsav; 539 u_char vflagsav; 540 541 INP_WLOCK(inp); 542 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 543 INP_WUNLOCK(inp); 544 return (ECONNREFUSED); 545 } 546 547 vflagsav = inp->inp_vflag; 548 incflagsav = inp->inp_inc.inc_flags; 549 550 sin6 = (struct sockaddr_in6 *)nam; 551 if (nam->sa_family != AF_INET6) { 552 error = EAFNOSUPPORT; 553 goto out; 554 } 555 if (nam->sa_len != sizeof (*sin6)) { 556 error = EINVAL; 557 goto out; 558 } 559 /* 560 * Must disallow TCP ``connections'' to multicast addresses. 561 */ 562 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 563 error = EAFNOSUPPORT; 564 goto out; 565 } 566 if (SOLISTENING(so)) { 567 error = EOPNOTSUPP; 568 goto out; 569 } 570 #ifdef INET 571 /* 572 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 573 * therefore probably require the hash lock, which isn't held here. 574 * Is this a significant problem? 575 */ 576 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 577 struct sockaddr_in sin; 578 579 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 580 error = EINVAL; 581 goto out; 582 } 583 if ((inp->inp_vflag & INP_IPV4) == 0) { 584 error = EAFNOSUPPORT; 585 goto out; 586 } 587 588 in6_sin6_2_sin(&sin, sin6); 589 if (IN_MULTICAST(ntohl(sin.sin_addr.s_addr))) { 590 error = EAFNOSUPPORT; 591 goto out; 592 } 593 if (ntohl(sin.sin_addr.s_addr) == INADDR_BROADCAST) { 594 error = EACCES; 595 goto out; 596 } 597 if ((error = prison_remote_ip4(td->td_ucred, 598 &sin.sin_addr)) != 0) 599 goto out; 600 inp->inp_vflag |= INP_IPV4; 601 inp->inp_vflag &= ~INP_IPV6; 602 NET_EPOCH_ENTER(et); 603 if ((error = tcp_connect(tp, &sin, td)) != 0) 604 goto out_in_epoch; 605 #ifdef TCP_OFFLOAD 606 if (registered_toedevs > 0 && 607 (so->so_options & SO_NO_OFFLOAD) == 0 && 608 (error = tcp_offload_connect(so, nam)) == 0) 609 goto out_in_epoch; 610 #endif 611 error = tcp_output(tp); 612 goto out_in_epoch; 613 } else { 614 if ((inp->inp_vflag & INP_IPV6) == 0) { 615 error = EAFNOSUPPORT; 616 goto out; 617 } 618 } 619 #endif 620 if ((error = prison_remote_ip6(td->td_ucred, &sin6->sin6_addr)) != 0) 621 goto out; 622 inp->inp_vflag &= ~INP_IPV4; 623 inp->inp_vflag |= INP_IPV6; 624 inp->inp_inc.inc_flags |= INC_ISIPV6; 625 NET_EPOCH_ENTER(et); 626 if ((error = tcp6_connect(tp, sin6, td)) != 0) 627 goto out_in_epoch; 628 #ifdef TCP_OFFLOAD 629 if (registered_toedevs > 0 && 630 (so->so_options & SO_NO_OFFLOAD) == 0 && 631 (error = tcp_offload_connect(so, nam)) == 0) 632 goto out_in_epoch; 633 #endif 634 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 635 error = tcp_output(tp); 636 out_in_epoch: 637 NET_EPOCH_EXIT(et); 638 out: 639 KASSERT(error >= 0, ("TCP stack %s requested tcp_drop(%p) at connect()" 640 ", error code %d", tp->t_fb->tfb_tcp_block_name, tp, -error)); 641 /* 642 * If the implicit bind in the connect call fails, restore 643 * the flags we modified. 644 */ 645 if (error != 0 && inp->inp_lport == 0) { 646 inp->inp_vflag = vflagsav; 647 inp->inp_inc.inc_flags = incflagsav; 648 } 649 650 tcp_bblog_pru(tp, PRU_CONNECT, error); 651 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 652 INP_WUNLOCK(inp); 653 return (error); 654 } 655 #endif /* INET6 */ 656 657 /* 658 * Initiate disconnect from peer. 659 * If connection never passed embryonic stage, just drop; 660 * else if don't need to let data drain, then can just drop anyways, 661 * else have to begin TCP shutdown process: mark socket disconnecting, 662 * drain unread data, state switch to reflect user close, and 663 * send segment (e.g. FIN) to peer. Socket will be really disconnected 664 * when peer sends FIN and acks ours. 665 * 666 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 667 */ 668 static int 669 tcp_usr_disconnect(struct socket *so) 670 { 671 struct inpcb *inp; 672 struct tcpcb *tp = NULL; 673 struct epoch_tracker et; 674 675 NET_EPOCH_ENTER(et); 676 inp = sotoinpcb(so); 677 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 678 INP_WLOCK(inp); 679 tp = intotcpcb(inp); 680 681 if (tp->t_state == TCPS_TIME_WAIT) 682 goto out; 683 tcp_disconnect(tp); 684 out: 685 tcp_bblog_pru(tp, PRU_DISCONNECT, 0); 686 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 687 INP_WUNLOCK(inp); 688 NET_EPOCH_EXIT(et); 689 return (0); 690 } 691 692 #ifdef INET 693 /* 694 * Accept a connection. Essentially all the work is done at higher levels; 695 * just return the address of the peer, storing through addr. 696 */ 697 static int 698 tcp_usr_accept(struct socket *so, struct sockaddr *sa) 699 { 700 struct inpcb *inp = sotoinpcb(so); 701 struct tcpcb *tp = intotcpcb(inp); 702 int error = 0; 703 704 INP_WLOCK(inp); 705 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 706 INP_WUNLOCK(inp); 707 return (ECONNABORTED); 708 } 709 710 if (so->so_state & SS_ISDISCONNECTED) 711 error = ECONNABORTED; 712 else 713 *(struct sockaddr_in *)sa = (struct sockaddr_in ){ 714 .sin_family = AF_INET, 715 .sin_len = sizeof(struct sockaddr_in), 716 .sin_port = inp->inp_fport, 717 .sin_addr = inp->inp_faddr, 718 }; 719 tcp_bblog_pru(tp, PRU_ACCEPT, error); 720 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 721 INP_WUNLOCK(inp); 722 723 return (error); 724 } 725 #endif /* INET */ 726 727 #ifdef INET6 728 static int 729 tcp6_usr_accept(struct socket *so, struct sockaddr *sa) 730 { 731 struct inpcb *inp = sotoinpcb(so); 732 struct tcpcb *tp = intotcpcb(inp); 733 int error = 0; 734 735 INP_WLOCK(inp); 736 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 737 INP_WUNLOCK(inp); 738 return (ECONNABORTED); 739 } 740 741 if (so->so_state & SS_ISDISCONNECTED) { 742 error = ECONNABORTED; 743 } else { 744 if (inp->inp_vflag & INP_IPV4) { 745 struct sockaddr_in sin = { 746 .sin_family = AF_INET, 747 .sin_len = sizeof(struct sockaddr_in), 748 .sin_port = inp->inp_fport, 749 .sin_addr = inp->inp_faddr, 750 }; 751 in6_sin_2_v4mapsin6(&sin, (struct sockaddr_in6 *)sa); 752 } else { 753 *(struct sockaddr_in6 *)sa = (struct sockaddr_in6 ){ 754 .sin6_family = AF_INET6, 755 .sin6_len = sizeof(struct sockaddr_in6), 756 .sin6_port = inp->inp_fport, 757 .sin6_addr = inp->in6p_faddr, 758 }; 759 /* XXX: should catch errors */ 760 (void)sa6_recoverscope((struct sockaddr_in6 *)sa); 761 } 762 } 763 764 tcp_bblog_pru(tp, PRU_ACCEPT, error); 765 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 766 INP_WUNLOCK(inp); 767 768 return (error); 769 } 770 #endif /* INET6 */ 771 772 /* 773 * Mark the connection as being incapable of further output. 774 */ 775 static int 776 tcp_usr_shutdown(struct socket *so, enum shutdown_how how) 777 { 778 struct epoch_tracker et; 779 struct inpcb *inp = sotoinpcb(so); 780 struct tcpcb *tp = intotcpcb(inp); 781 int error = 0; 782 783 SOCK_LOCK(so); 784 if (SOLISTENING(so)) { 785 if (how != SHUT_WR) { 786 so->so_error = ECONNABORTED; 787 solisten_wakeup(so); /* unlocks so */ 788 } else 789 SOCK_UNLOCK(so); 790 return (ENOTCONN); 791 } else if ((so->so_state & 792 (SS_ISCONNECTED | SS_ISCONNECTING | SS_ISDISCONNECTING)) == 0) { 793 SOCK_UNLOCK(so); 794 return (ENOTCONN); 795 } 796 SOCK_UNLOCK(so); 797 798 switch (how) { 799 case SHUT_RD: 800 sorflush(so); 801 break; 802 case SHUT_RDWR: 803 sorflush(so); 804 /* FALLTHROUGH */ 805 case SHUT_WR: 806 /* 807 * XXXGL: mimicing old soshutdown() here. But shouldn't we 808 * return ECONNRESEST for SHUT_RD as well? 809 */ 810 INP_WLOCK(inp); 811 if (tp->t_flags & TF_DISCONNECTED) { 812 INP_WUNLOCK(inp); 813 return (ECONNRESET); 814 } 815 816 socantsendmore(so); 817 NET_EPOCH_ENTER(et); 818 tcp_usrclosed(tp); 819 error = tcp_output_nodrop(tp); 820 tcp_bblog_pru(tp, PRU_SHUTDOWN, error); 821 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 822 error = tcp_unlock_or_drop(tp, error); 823 NET_EPOCH_EXIT(et); 824 } 825 wakeup(&so->so_timeo); 826 827 return (error); 828 } 829 830 /* 831 * After a receive, possibly send window update to peer. 832 */ 833 static int 834 tcp_usr_rcvd(struct socket *so, int flags) 835 { 836 struct epoch_tracker et; 837 struct inpcb *inp = sotoinpcb(so); 838 struct tcpcb *tp = intotcpcb(inp); 839 int outrv = 0, error = 0; 840 841 INP_WLOCK(inp); 842 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 843 /* XXXGL: how could this happen?! */ 844 INP_WUNLOCK(inp); 845 return (ECONNRESET); 846 } 847 848 NET_EPOCH_ENTER(et); 849 /* 850 * For passively-created TFO connections, don't attempt a window 851 * update while still in SYN_RECEIVED as this may trigger an early 852 * SYN|ACK. It is preferable to have the SYN|ACK be sent along with 853 * application response data, or failing that, when the DELACK timer 854 * expires. 855 */ 856 if ((tp->t_flags & TF_FASTOPEN) && (tp->t_state == TCPS_SYN_RECEIVED)) 857 goto out; 858 #ifdef TCP_OFFLOAD 859 if (tp->t_flags & TF_TOE) 860 tcp_offload_rcvd(tp); 861 else 862 #endif 863 outrv = tcp_output_nodrop(tp); 864 out: 865 tcp_bblog_pru(tp, PRU_RCVD, error); 866 TCP_PROBE2(debug__user, tp, PRU_RCVD); 867 (void) tcp_unlock_or_drop(tp, outrv); 868 NET_EPOCH_EXIT(et); 869 return (error); 870 } 871 872 /* 873 * Do a send by putting data in output queue and updating urgent 874 * marker if URG set. Possibly send more data. Unlike the other 875 * pr_*() routines, the mbuf chains are our responsibility. We 876 * must either enqueue them or free them. The other pr_*() routines 877 * generally are caller-frees. 878 */ 879 static int 880 tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 881 struct sockaddr *nam, struct mbuf *control, struct thread *td) 882 { 883 struct epoch_tracker et; 884 struct inpcb *inp = sotoinpcb(so); 885 struct tcpcb *tp = intotcpcb(inp); 886 #ifdef INET 887 #ifdef INET6 888 struct sockaddr_in sin; 889 #endif 890 struct sockaddr_in *sinp; 891 #endif 892 #ifdef INET6 893 struct sockaddr_in6 *sin6; 894 int isipv6; 895 #endif 896 int error = 0; 897 u_int8_t incflagsav; 898 u_char vflagsav; 899 bool restoreflags; 900 901 INP_WLOCK(inp); 902 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 903 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 904 m_freem(m); 905 INP_WUNLOCK(inp); 906 return (ECONNRESET); 907 } 908 909 vflagsav = inp->inp_vflag; 910 incflagsav = inp->inp_inc.inc_flags; 911 restoreflags = false; 912 913 NET_EPOCH_ENTER(et); 914 if (control != NULL) { 915 /* TCP doesn't do control messages (rights, creds, etc) */ 916 if (control->m_len > 0) { 917 m_freem(control); 918 error = EINVAL; 919 goto out; 920 } 921 m_freem(control); /* empty control, just free it */ 922 } 923 924 if ((flags & PRUS_OOB) != 0 && 925 (error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) 926 goto out; 927 928 if (nam != NULL && tp->t_state < TCPS_SYN_SENT) { 929 if (tp->t_state == TCPS_LISTEN) { 930 error = EINVAL; 931 goto out; 932 } 933 switch (nam->sa_family) { 934 #ifdef INET 935 case AF_INET: 936 sinp = (struct sockaddr_in *)nam; 937 if (sinp->sin_len != sizeof(struct sockaddr_in)) { 938 error = EINVAL; 939 goto out; 940 } 941 if ((inp->inp_vflag & INP_IPV6) != 0) { 942 error = EAFNOSUPPORT; 943 goto out; 944 } 945 if (IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 946 error = EAFNOSUPPORT; 947 goto out; 948 } 949 if (ntohl(sinp->sin_addr.s_addr) == INADDR_BROADCAST) { 950 error = EACCES; 951 goto out; 952 } 953 if ((error = prison_remote_ip4(td->td_ucred, 954 &sinp->sin_addr))) 955 goto out; 956 #ifdef INET6 957 isipv6 = 0; 958 #endif 959 break; 960 #endif /* INET */ 961 #ifdef INET6 962 case AF_INET6: 963 sin6 = (struct sockaddr_in6 *)nam; 964 if (sin6->sin6_len != sizeof(*sin6)) { 965 error = EINVAL; 966 goto out; 967 } 968 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) { 969 error = EAFNOSUPPORT; 970 goto out; 971 } 972 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 973 error = EAFNOSUPPORT; 974 goto out; 975 } 976 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 977 #ifdef INET 978 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 979 error = EINVAL; 980 goto out; 981 } 982 if ((inp->inp_vflag & INP_IPV4) == 0) { 983 error = EAFNOSUPPORT; 984 goto out; 985 } 986 restoreflags = true; 987 inp->inp_vflag &= ~INP_IPV6; 988 sinp = &sin; 989 in6_sin6_2_sin(sinp, sin6); 990 if (IN_MULTICAST( 991 ntohl(sinp->sin_addr.s_addr))) { 992 error = EAFNOSUPPORT; 993 goto out; 994 } 995 if ((error = prison_remote_ip4(td->td_ucred, 996 &sinp->sin_addr))) 997 goto out; 998 isipv6 = 0; 999 #else /* !INET */ 1000 error = EAFNOSUPPORT; 1001 goto out; 1002 #endif /* INET */ 1003 } else { 1004 if ((inp->inp_vflag & INP_IPV6) == 0) { 1005 error = EAFNOSUPPORT; 1006 goto out; 1007 } 1008 restoreflags = true; 1009 inp->inp_vflag &= ~INP_IPV4; 1010 inp->inp_inc.inc_flags |= INC_ISIPV6; 1011 if ((error = prison_remote_ip6(td->td_ucred, 1012 &sin6->sin6_addr))) 1013 goto out; 1014 isipv6 = 1; 1015 } 1016 break; 1017 #endif /* INET6 */ 1018 default: 1019 error = EAFNOSUPPORT; 1020 goto out; 1021 } 1022 } 1023 if (!(flags & PRUS_OOB)) { 1024 if (tp->t_acktime == 0) 1025 tp->t_acktime = ticks; 1026 sbappendstream(&so->so_snd, m, flags); 1027 m = NULL; 1028 if (nam && tp->t_state < TCPS_SYN_SENT) { 1029 KASSERT(tp->t_state == TCPS_CLOSED, 1030 ("%s: tp %p is listening", __func__, tp)); 1031 1032 /* 1033 * Do implied connect if not yet connected, 1034 * initialize window to default value, and 1035 * initialize maxseg using peer's cached MSS. 1036 */ 1037 #ifdef INET6 1038 if (isipv6) 1039 error = tcp6_connect(tp, sin6, td); 1040 #endif /* INET6 */ 1041 #if defined(INET6) && defined(INET) 1042 else 1043 #endif 1044 #ifdef INET 1045 error = tcp_connect(tp, sinp, td); 1046 #endif 1047 /* 1048 * The bind operation in tcp_connect succeeded. We 1049 * no longer want to restore the flags if later 1050 * operations fail. 1051 */ 1052 if (error == 0 || inp->inp_lport != 0) 1053 restoreflags = false; 1054 1055 if (error) { 1056 /* m is freed if PRUS_NOTREADY is unset. */ 1057 sbflush(&so->so_snd); 1058 goto out; 1059 } 1060 if (tp->t_flags & TF_FASTOPEN) 1061 tcp_fastopen_connect(tp); 1062 else { 1063 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1064 tcp_mss(tp, -1); 1065 } 1066 } 1067 if (flags & PRUS_EOF) { 1068 /* 1069 * Close the send side of the connection after 1070 * the data is sent. 1071 */ 1072 socantsendmore(so); 1073 tcp_usrclosed(tp); 1074 } 1075 if (TCPS_HAVEESTABLISHED(tp->t_state) && 1076 ((tp->t_flags2 & TF2_FBYTES_COMPLETE) == 0) && 1077 (tp->t_fbyte_out == 0) && 1078 (so->so_snd.sb_ccc > 0)) { 1079 tp->t_fbyte_out = ticks; 1080 if (tp->t_fbyte_out == 0) 1081 tp->t_fbyte_out = 1; 1082 if (tp->t_fbyte_out && tp->t_fbyte_in) 1083 tp->t_flags2 |= TF2_FBYTES_COMPLETE; 1084 } 1085 if (!(flags & PRUS_NOTREADY)) { 1086 if (flags & PRUS_MORETOCOME) 1087 tp->t_flags |= TF_MORETOCOME; 1088 error = tcp_output_nodrop(tp); 1089 if (flags & PRUS_MORETOCOME) 1090 tp->t_flags &= ~TF_MORETOCOME; 1091 } 1092 } else { 1093 /* 1094 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 1095 */ 1096 SOCK_SENDBUF_LOCK(so); 1097 if (sbspace(&so->so_snd) < -512) { 1098 SOCK_SENDBUF_UNLOCK(so); 1099 error = ENOBUFS; 1100 goto out; 1101 } 1102 /* 1103 * According to RFC961 (Assigned Protocols), 1104 * the urgent pointer points to the last octet 1105 * of urgent data. We continue, however, 1106 * to consider it to indicate the first octet 1107 * of data past the urgent section. 1108 * Otherwise, snd_up should be one lower. 1109 */ 1110 if (tp->t_acktime == 0) 1111 tp->t_acktime = ticks; 1112 sbappendstream_locked(&so->so_snd, m, flags); 1113 SOCK_SENDBUF_UNLOCK(so); 1114 m = NULL; 1115 if (nam && tp->t_state < TCPS_SYN_SENT) { 1116 /* 1117 * Do implied connect if not yet connected, 1118 * initialize window to default value, and 1119 * initialize maxseg using peer's cached MSS. 1120 */ 1121 1122 /* 1123 * Not going to contemplate SYN|URG 1124 */ 1125 if (tp->t_flags & TF_FASTOPEN) 1126 tp->t_flags &= ~TF_FASTOPEN; 1127 #ifdef INET6 1128 if (isipv6) 1129 error = tcp6_connect(tp, sin6, td); 1130 #endif /* INET6 */ 1131 #if defined(INET6) && defined(INET) 1132 else 1133 #endif 1134 #ifdef INET 1135 error = tcp_connect(tp, sinp, td); 1136 #endif 1137 /* 1138 * The bind operation in tcp_connect succeeded. We 1139 * no longer want to restore the flags if later 1140 * operations fail. 1141 */ 1142 if (error == 0 || inp->inp_lport != 0) 1143 restoreflags = false; 1144 1145 if (error != 0) { 1146 /* m is freed if PRUS_NOTREADY is unset. */ 1147 sbflush(&so->so_snd); 1148 goto out; 1149 } 1150 tp->snd_wnd = TTCP_CLIENT_SND_WND; 1151 tcp_mss(tp, -1); 1152 } 1153 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 1154 if ((flags & PRUS_NOTREADY) == 0) { 1155 tp->t_flags |= TF_FORCEDATA; 1156 error = tcp_output_nodrop(tp); 1157 tp->t_flags &= ~TF_FORCEDATA; 1158 } 1159 } 1160 TCP_LOG_EVENT(tp, NULL, 1161 &inp->inp_socket->so_rcv, 1162 &inp->inp_socket->so_snd, 1163 TCP_LOG_USERSEND, error, 1164 0, NULL, false); 1165 1166 out: 1167 /* 1168 * In case of PRUS_NOTREADY, the caller or tcp_usr_ready() is 1169 * responsible for freeing memory. 1170 */ 1171 if (m != NULL && (flags & PRUS_NOTREADY) == 0) 1172 m_freem(m); 1173 1174 /* 1175 * If the request was unsuccessful and we changed flags, 1176 * restore the original flags. 1177 */ 1178 if (error != 0 && restoreflags) { 1179 inp->inp_vflag = vflagsav; 1180 inp->inp_inc.inc_flags = incflagsav; 1181 } 1182 tcp_bblog_pru(tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1183 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND), error); 1184 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 1185 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 1186 error = tcp_unlock_or_drop(tp, error); 1187 NET_EPOCH_EXIT(et); 1188 return (error); 1189 } 1190 1191 static int 1192 tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 1193 { 1194 struct epoch_tracker et; 1195 struct inpcb *inp = sotoinpcb(so); 1196 struct tcpcb *tp = intotcpcb(inp); 1197 int error; 1198 1199 INP_WLOCK(inp); 1200 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 1201 INP_WUNLOCK(inp); 1202 mb_free_notready(m, count); 1203 return (ECONNRESET); 1204 } 1205 1206 SOCK_SENDBUF_LOCK(so); 1207 error = sbready(&so->so_snd, m, count); 1208 SOCK_SENDBUF_UNLOCK(so); 1209 if (error) { 1210 INP_WUNLOCK(inp); 1211 return (error); 1212 } 1213 NET_EPOCH_ENTER(et); 1214 error = tcp_output_unlock(tp); 1215 NET_EPOCH_EXIT(et); 1216 1217 return (error); 1218 } 1219 1220 /* 1221 * Abort the TCP. Drop the connection abruptly. 1222 */ 1223 static void 1224 tcp_usr_abort(struct socket *so) 1225 { 1226 struct epoch_tracker et; 1227 struct inpcb *inp = sotoinpcb(so); 1228 struct tcpcb *tp = intotcpcb(inp); 1229 1230 /* 1231 * If we still have full TCP state, and we're not dropped, drop. 1232 */ 1233 NET_EPOCH_ENTER(et); 1234 INP_WLOCK(inp); 1235 if (!(tp->t_flags & TF_DISCONNECTED)) { 1236 tp = tcp_drop(tp, ECONNABORTED); 1237 if (tp == NULL) 1238 goto dropped; 1239 tcp_bblog_pru(tp, PRU_ABORT, 0); 1240 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1241 } 1242 if (!(tp->t_flags & TF_DISCONNECTED)) { 1243 soref(so); 1244 inp->inp_flags |= INP_SOCKREF; 1245 } 1246 INP_WUNLOCK(inp); 1247 dropped: 1248 NET_EPOCH_EXIT(et); 1249 } 1250 1251 /* 1252 * TCP socket is closed. Start friendly disconnect. 1253 */ 1254 static void 1255 tcp_usr_close(struct socket *so) 1256 { 1257 struct epoch_tracker et; 1258 struct inpcb *inp = sotoinpcb(so); 1259 struct tcpcb *tp = intotcpcb(inp); 1260 1261 /* 1262 * If we are still connected and we're not dropped, initiate 1263 * a disconnect. 1264 */ 1265 NET_EPOCH_ENTER(et); 1266 INP_WLOCK(inp); 1267 if (!(tp->t_flags & TF_DISCONNECTED)) { 1268 if (tp->t_state != TCPS_TIME_WAIT) { 1269 tp->t_flags |= TF_CLOSED; 1270 tcp_disconnect(tp); 1271 tcp_bblog_pru(tp, PRU_CLOSE, 0); 1272 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1273 } 1274 } 1275 if (!(tp->t_flags & TF_DISCONNECTED)) { 1276 soref(so); 1277 inp->inp_flags |= INP_SOCKREF; 1278 } 1279 INP_WUNLOCK(inp); 1280 NET_EPOCH_EXIT(et); 1281 } 1282 1283 static int 1284 tcp_pru_options_support(struct tcpcb *tp, int flags) 1285 { 1286 /* 1287 * If the specific TCP stack has a pru_options 1288 * specified then it does not always support 1289 * all the PRU_XX options and we must ask it. 1290 * If the function is not specified then all 1291 * of the PRU_XX options are supported. 1292 */ 1293 int ret = 0; 1294 1295 if (tp->t_fb->tfb_pru_options) { 1296 ret = (*tp->t_fb->tfb_pru_options)(tp, flags); 1297 } 1298 return (ret); 1299 } 1300 1301 /* 1302 * Receive out-of-band data. 1303 */ 1304 static int 1305 tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1306 { 1307 struct inpcb *inp = sotoinpcb(so); 1308 struct tcpcb *tp = intotcpcb(inp); 1309 int error = 0; 1310 1311 INP_WLOCK(inp); 1312 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 1313 /* XXXGL: how could this happen?! */ 1314 INP_WUNLOCK(inp); 1315 return (ECONNRESET); 1316 } 1317 1318 error = tcp_pru_options_support(tp, PRUS_OOB); 1319 if (error) { 1320 goto out; 1321 } 1322 if ((so->so_oobmark == 0 && 1323 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1324 so->so_options & SO_OOBINLINE || 1325 tp->t_oobflags & TCPOOB_HADDATA) { 1326 error = EINVAL; 1327 goto out; 1328 } 1329 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1330 error = EWOULDBLOCK; 1331 goto out; 1332 } 1333 m->m_len = 1; 1334 *mtod(m, caddr_t) = tp->t_iobc; 1335 if ((flags & MSG_PEEK) == 0) 1336 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1337 1338 out: 1339 tcp_bblog_pru(tp, PRU_RCVOOB, error); 1340 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1341 INP_WUNLOCK(inp); 1342 return (error); 1343 } 1344 1345 #ifdef INET 1346 struct protosw tcp_protosw = { 1347 .pr_type = SOCK_STREAM, 1348 .pr_protocol = IPPROTO_TCP, 1349 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL | PR_WANTRCVD | 1350 PR_CAPATTACH, 1351 .pr_ctloutput = tcp_ctloutput, 1352 .pr_abort = tcp_usr_abort, 1353 .pr_accept = tcp_usr_accept, 1354 .pr_attach = tcp_usr_attach, 1355 .pr_bind = tcp_usr_bind, 1356 .pr_connect = tcp_usr_connect, 1357 .pr_control = in_control, 1358 .pr_detach = tcp_usr_detach, 1359 .pr_disconnect = tcp_usr_disconnect, 1360 .pr_listen = tcp_usr_listen, 1361 .pr_peeraddr = in_getpeeraddr, 1362 .pr_rcvd = tcp_usr_rcvd, 1363 .pr_rcvoob = tcp_usr_rcvoob, 1364 .pr_send = tcp_usr_send, 1365 .pr_sendfile_wait = sendfile_wait_generic, 1366 .pr_ready = tcp_usr_ready, 1367 .pr_shutdown = tcp_usr_shutdown, 1368 .pr_sockaddr = in_getsockaddr, 1369 .pr_sosetlabel = in_pcbsosetlabel, 1370 .pr_close = tcp_usr_close, 1371 }; 1372 #endif /* INET */ 1373 1374 #ifdef INET6 1375 struct protosw tcp6_protosw = { 1376 .pr_type = SOCK_STREAM, 1377 .pr_protocol = IPPROTO_TCP, 1378 .pr_flags = PR_CONNREQUIRED | PR_IMPLOPCL |PR_WANTRCVD | 1379 PR_CAPATTACH, 1380 .pr_ctloutput = tcp_ctloutput, 1381 .pr_abort = tcp_usr_abort, 1382 .pr_accept = tcp6_usr_accept, 1383 .pr_attach = tcp_usr_attach, 1384 .pr_bind = tcp6_usr_bind, 1385 .pr_connect = tcp6_usr_connect, 1386 .pr_control = in6_control, 1387 .pr_detach = tcp_usr_detach, 1388 .pr_disconnect = tcp_usr_disconnect, 1389 .pr_listen = tcp6_usr_listen, 1390 .pr_peeraddr = in6_mapped_peeraddr, 1391 .pr_rcvd = tcp_usr_rcvd, 1392 .pr_rcvoob = tcp_usr_rcvoob, 1393 .pr_send = tcp_usr_send, 1394 .pr_sendfile_wait = sendfile_wait_generic, 1395 .pr_ready = tcp_usr_ready, 1396 .pr_shutdown = tcp_usr_shutdown, 1397 .pr_sockaddr = in6_mapped_sockaddr, 1398 .pr_sosetlabel = in_pcbsosetlabel, 1399 .pr_close = tcp_usr_close, 1400 }; 1401 #endif /* INET6 */ 1402 1403 #ifdef INET 1404 /* 1405 * Common subroutine to open a TCP connection to remote host specified 1406 * by struct sockaddr_in. Call in_pcbconnect() to choose local host address 1407 * and assign a local port number and install the inpcb into the hash. 1408 * Initialize connection parameters and enter SYN-SENT state. 1409 */ 1410 static int 1411 tcp_connect(struct tcpcb *tp, struct sockaddr_in *sin, struct thread *td) 1412 { 1413 struct inpcb *inp = tptoinpcb(tp); 1414 struct socket *so = tptosocket(tp); 1415 int error; 1416 1417 NET_EPOCH_ASSERT(); 1418 INP_WLOCK_ASSERT(inp); 1419 1420 if (__predict_false((so->so_state & 1421 (SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING | 1422 SS_ISDISCONNECTED)) != 0)) 1423 return (EISCONN); 1424 if (__predict_false((so->so_options & SO_REUSEPORT_LB) != 0)) 1425 return (EOPNOTSUPP); 1426 1427 error = in_pcbconnect(inp, sin, td->td_ucred); 1428 if (error != 0) 1429 return (error); 1430 1431 /* set the hash on the connection */ 1432 rss_proto_software_hash_v4(inp->inp_faddr, inp->inp_laddr, 1433 inp->inp_fport, inp->inp_lport, IPPROTO_TCP, 1434 &inp->inp_flowid, &inp->inp_flowtype); 1435 /* 1436 * Compute window scaling to request: 1437 * Scale to fit into sweet spot. See tcp_syncache.c. 1438 * XXX: This should move to tcp_output(). 1439 */ 1440 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1441 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1442 tp->request_r_scale++; 1443 1444 soisconnecting(so); 1445 TCPSTAT_INC(tcps_connattempt); 1446 tcp_state_change(tp, TCPS_SYN_SENT); 1447 tp->iss = tcp_new_isn(&inp->inp_inc); 1448 if (tp->t_flags & TF_REQ_TSTMP) 1449 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1450 tcp_sendseqinit(tp); 1451 1452 return (0); 1453 } 1454 #endif /* INET */ 1455 1456 #ifdef INET6 1457 static int 1458 tcp6_connect(struct tcpcb *tp, struct sockaddr_in6 *sin6, struct thread *td) 1459 { 1460 struct inpcb *inp = tptoinpcb(tp); 1461 struct socket *so = tptosocket(tp); 1462 int error; 1463 1464 NET_EPOCH_ASSERT(); 1465 INP_WLOCK_ASSERT(inp); 1466 1467 if (__predict_false((so->so_state & 1468 (SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING | 1469 SS_ISDISCONNECTED)) != 0)) 1470 return (EISCONN); 1471 if (__predict_false((so->so_options & SO_REUSEPORT_LB) != 0)) 1472 return (EOPNOTSUPP); 1473 1474 error = in6_pcbconnect(inp, sin6, td->td_ucred, true); 1475 if (error != 0) 1476 return (error); 1477 1478 /* set the hash on the connection */ 1479 rss_proto_software_hash_v6(&inp->in6p_faddr, 1480 &inp->in6p_laddr, inp->inp_fport, inp->inp_lport, IPPROTO_TCP, 1481 &inp->inp_flowid, &inp->inp_flowtype); 1482 /* Compute window scaling to request. */ 1483 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1484 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1485 tp->request_r_scale++; 1486 1487 soisconnecting(so); 1488 TCPSTAT_INC(tcps_connattempt); 1489 tcp_state_change(tp, TCPS_SYN_SENT); 1490 tp->iss = tcp_new_isn(&inp->inp_inc); 1491 if (tp->t_flags & TF_REQ_TSTMP) 1492 tp->ts_offset = tcp_new_ts_offset(&inp->inp_inc); 1493 tcp_sendseqinit(tp); 1494 1495 return (0); 1496 } 1497 #endif /* INET6 */ 1498 1499 /* 1500 * Export TCP internal state information via a struct tcp_info, based on the 1501 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1502 * (TCP state machine, etc). We export all information using FreeBSD-native 1503 * constants -- for example, the numeric values for tcpi_state will differ 1504 * from Linux. 1505 */ 1506 void 1507 tcp_fill_info(const struct tcpcb *tp, struct tcp_info *ti) 1508 { 1509 1510 INP_LOCK_ASSERT(tptoinpcb(tp)); 1511 bzero(ti, sizeof(*ti)); 1512 1513 ti->tcpi_state = tp->t_state; 1514 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1515 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1516 if (tp->t_flags & TF_SACK_PERMIT) 1517 ti->tcpi_options |= TCPI_OPT_SACK; 1518 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1519 ti->tcpi_options |= TCPI_OPT_WSCALE; 1520 ti->tcpi_snd_wscale = tp->snd_scale; 1521 ti->tcpi_rcv_wscale = tp->rcv_scale; 1522 } 1523 switch (tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) { 1524 case TF2_ECN_PERMIT: 1525 ti->tcpi_options |= TCPI_OPT_ECN; 1526 break; 1527 case TF2_ACE_PERMIT: 1528 /* FALLTHROUGH */ 1529 case TF2_ECN_PERMIT | TF2_ACE_PERMIT: 1530 ti->tcpi_options |= TCPI_OPT_ACE; 1531 break; 1532 default: 1533 break; 1534 } 1535 if (tp->t_flags & TF_FASTOPEN) 1536 ti->tcpi_options |= TCPI_OPT_TFO; 1537 1538 ti->tcpi_rto = tp->t_rxtcur * tick; 1539 ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick; 1540 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1541 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1542 1543 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1544 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1545 1546 /* 1547 * FreeBSD-specific extension fields for tcp_info. 1548 */ 1549 ti->tcpi_rcv_space = tp->rcv_wnd; 1550 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1551 ti->tcpi_snd_wnd = tp->snd_wnd; 1552 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1553 ti->tcpi_snd_nxt = tp->snd_nxt; 1554 ti->tcpi_snd_mss = tp->t_maxseg; 1555 ti->tcpi_rcv_mss = tp->t_maxseg; 1556 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1557 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1558 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1559 ti->tcpi_snd_una = tp->snd_una; 1560 ti->tcpi_snd_max = tp->snd_max; 1561 ti->tcpi_rcv_numsacks = tp->rcv_numsacks; 1562 ti->tcpi_rcv_adv = tp->rcv_adv; 1563 ti->tcpi_dupacks = tp->t_dupacks; 1564 ti->tcpi_rttmin = tp->t_rttlow; 1565 #ifdef TCP_OFFLOAD 1566 if (tp->t_flags & TF_TOE) { 1567 ti->tcpi_options |= TCPI_OPT_TOE; 1568 tcp_offload_tcp_info(tp, ti); 1569 } 1570 #endif 1571 /* 1572 * AccECN related counters. 1573 */ 1574 if ((tp->t_flags2 & (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) == 1575 (TF2_ECN_PERMIT | TF2_ACE_PERMIT)) 1576 /* 1577 * Internal counter starts at 5 for AccECN 1578 * but 0 for RFC3168 ECN. 1579 */ 1580 ti->tcpi_delivered_ce = tp->t_scep - 5; 1581 else 1582 ti->tcpi_delivered_ce = tp->t_scep; 1583 ti->tcpi_received_ce = tp->t_rcep; 1584 } 1585 1586 /* 1587 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1588 * socket option arguments. When it re-acquires the lock after the copy, it 1589 * has to revalidate that the connection is still valid for the socket 1590 * option. 1591 * XXXGL: review if this is really needed 1592 */ 1593 #define INP_WLOCK_RECHECK_CLEANUP(inp, cleanup) do { \ 1594 INP_WLOCK(inp); \ 1595 tp = intotcpcb(inp); \ 1596 if (tp->t_flags & TF_DISCONNECTED) { \ 1597 INP_WUNLOCK(inp); \ 1598 cleanup; \ 1599 return (ECONNRESET); \ 1600 } \ 1601 } while(0) 1602 #define INP_WLOCK_RECHECK(inp) INP_WLOCK_RECHECK_CLEANUP((inp), /* noop */) 1603 1604 int 1605 tcp_ctloutput_set(struct inpcb *inp, struct sockopt *sopt) 1606 { 1607 struct socket *so = inp->inp_socket; 1608 struct tcpcb *tp = intotcpcb(inp); 1609 int error = 0; 1610 1611 MPASS(sopt->sopt_dir == SOPT_SET); 1612 INP_WLOCK_ASSERT(inp); 1613 KASSERT((tp->t_flags & TF_DISCONNECTED) == 0, 1614 ("tp_flags == %x", tp->t_flags)); 1615 KASSERT(so != NULL, ("inp_socket == NULL")); 1616 1617 if (sopt->sopt_level != IPPROTO_TCP) { 1618 INP_WUNLOCK(inp); 1619 #ifdef INET6 1620 if (inp->inp_vflag & INP_IPV6PROTO) 1621 error = ip6_ctloutput(so, sopt); 1622 #endif 1623 #if defined(INET6) && defined(INET) 1624 else 1625 #endif 1626 #ifdef INET 1627 error = ip_ctloutput(so, sopt); 1628 #endif 1629 /* 1630 * When an IP-level socket option affects TCP, pass control 1631 * down to stack tfb_tcp_ctloutput, otherwise return what 1632 * IP level returned. 1633 */ 1634 switch (sopt->sopt_level) { 1635 #ifdef INET6 1636 case IPPROTO_IPV6: 1637 if ((inp->inp_vflag & INP_IPV6PROTO) == 0) 1638 return (error); 1639 switch (sopt->sopt_name) { 1640 case IPV6_TCLASS: 1641 /* Notify tcp stacks that care (e.g. RACK). */ 1642 break; 1643 case IPV6_USE_MIN_MTU: 1644 /* Update t_maxseg accordingly. */ 1645 break; 1646 default: 1647 return (error); 1648 } 1649 break; 1650 #endif 1651 #ifdef INET 1652 case IPPROTO_IP: 1653 switch (sopt->sopt_name) { 1654 case IP_TOS: 1655 inp->inp_ip_tos &= ~IPTOS_ECN_MASK; 1656 break; 1657 case IP_TTL: 1658 /* Notify tcp stacks that care (e.g. RACK). */ 1659 break; 1660 default: 1661 return (error); 1662 } 1663 break; 1664 #endif 1665 default: 1666 return (error); 1667 } 1668 INP_WLOCK_RECHECK(inp); 1669 } else if (sopt->sopt_name == TCP_FUNCTION_BLK) { 1670 /* 1671 * Protect the TCP option TCP_FUNCTION_BLK so 1672 * that a sub-function can *never* overwrite this. 1673 */ 1674 struct tcp_function_set fsn; 1675 struct tcp_function_block *blk; 1676 void *ptr = NULL; 1677 1678 INP_WUNLOCK(inp); 1679 error = sooptcopyin(sopt, &fsn, sizeof fsn, sizeof fsn); 1680 if (error) 1681 return (error); 1682 1683 INP_WLOCK_RECHECK(inp); 1684 1685 blk = find_and_ref_tcp_functions(&fsn); 1686 if (blk == NULL) { 1687 INP_WUNLOCK(inp); 1688 return (ENOENT); 1689 } 1690 if (tp->t_fb == blk) { 1691 /* You already have this */ 1692 refcount_release(&blk->tfb_refcnt); 1693 INP_WUNLOCK(inp); 1694 return (0); 1695 } 1696 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1697 refcount_release(&blk->tfb_refcnt); 1698 INP_WUNLOCK(inp); 1699 return (ENOENT); 1700 } 1701 error = (*blk->tfb_tcp_handoff_ok)(tp); 1702 if (error) { 1703 refcount_release(&blk->tfb_refcnt); 1704 INP_WUNLOCK(inp); 1705 return (error); 1706 } 1707 /* 1708 * Ensure the new stack takes ownership with a 1709 * clean slate on peak rate threshold. 1710 */ 1711 if (tp->t_fb->tfb_tcp_timer_stop_all != NULL) 1712 tp->t_fb->tfb_tcp_timer_stop_all(tp); 1713 if (blk->tfb_tcp_fb_init) { 1714 error = (*blk->tfb_tcp_fb_init)(tp, &ptr); 1715 if (error) { 1716 /* 1717 * Release the ref count the lookup 1718 * acquired. 1719 */ 1720 refcount_release(&blk->tfb_refcnt); 1721 /* 1722 * Now there is a chance that the 1723 * init() function mucked with some 1724 * things before it failed, such as 1725 * hpts or inp_flags2 or timer granularity. 1726 * It should not of, but lets give the old 1727 * stack a chance to reset to a known good state. 1728 */ 1729 if (tp->t_fb->tfb_switch_failed) { 1730 (*tp->t_fb->tfb_switch_failed)(tp); 1731 } 1732 goto err_out; 1733 } 1734 } 1735 if (tp->t_fb->tfb_tcp_fb_fini) { 1736 struct epoch_tracker et; 1737 /* 1738 * Tell the stack to cleanup with 0 i.e. 1739 * the tcb is not going away. 1740 */ 1741 NET_EPOCH_ENTER(et); 1742 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 1743 NET_EPOCH_EXIT(et); 1744 } 1745 /* 1746 * Release the old refcnt, the 1747 * lookup acquired a ref on the 1748 * new one already. 1749 */ 1750 refcount_release(&tp->t_fb->tfb_refcnt); 1751 /* 1752 * Set in the new stack. 1753 */ 1754 tp->t_fb = blk; 1755 tp->t_fb_ptr = ptr; 1756 #ifdef TCP_OFFLOAD 1757 if (tp->t_flags & TF_TOE) { 1758 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1759 sopt->sopt_name); 1760 } 1761 #endif 1762 err_out: 1763 INP_WUNLOCK(inp); 1764 return (error); 1765 1766 } 1767 1768 /* Pass in the INP locked, callee must unlock it. */ 1769 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt)); 1770 } 1771 1772 static int 1773 tcp_ctloutput_get(struct inpcb *inp, struct sockopt *sopt) 1774 { 1775 struct socket *so = inp->inp_socket; 1776 struct tcpcb *tp = intotcpcb(inp); 1777 int error = 0; 1778 1779 MPASS(sopt->sopt_dir == SOPT_GET); 1780 INP_WLOCK_ASSERT(inp); 1781 KASSERT((tp->t_flags & TF_DISCONNECTED) == 0, 1782 ("tp_flags == %x", tp->t_flags)); 1783 KASSERT(so != NULL, ("inp_socket == NULL")); 1784 1785 if (sopt->sopt_level != IPPROTO_TCP) { 1786 INP_WUNLOCK(inp); 1787 #ifdef INET6 1788 if (inp->inp_vflag & INP_IPV6PROTO) 1789 error = ip6_ctloutput(so, sopt); 1790 #endif /* INET6 */ 1791 #if defined(INET6) && defined(INET) 1792 else 1793 #endif 1794 #ifdef INET 1795 error = ip_ctloutput(so, sopt); 1796 #endif 1797 return (error); 1798 } 1799 if (((sopt->sopt_name == TCP_FUNCTION_BLK) || 1800 (sopt->sopt_name == TCP_FUNCTION_ALIAS))) { 1801 struct tcp_function_set fsn; 1802 1803 if (sopt->sopt_name == TCP_FUNCTION_ALIAS) { 1804 memset(&fsn, 0, sizeof(fsn)); 1805 find_tcp_function_alias(tp->t_fb, &fsn); 1806 } else { 1807 strncpy(fsn.function_set_name, 1808 tp->t_fb->tfb_tcp_block_name, 1809 TCP_FUNCTION_NAME_LEN_MAX); 1810 fsn.function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 1811 } 1812 fsn.pcbcnt = tp->t_fb->tfb_refcnt; 1813 INP_WUNLOCK(inp); 1814 error = sooptcopyout(sopt, &fsn, sizeof fsn); 1815 return (error); 1816 } 1817 1818 /* Pass in the INP locked, callee must unlock it. */ 1819 return (tp->t_fb->tfb_tcp_ctloutput(tp, sopt)); 1820 } 1821 1822 int 1823 tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1824 { 1825 struct inpcb *inp = sotoinpcb(so); 1826 struct tcpcb *tp = intotcpcb(inp); 1827 1828 INP_WLOCK(inp); 1829 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 1830 INP_WUNLOCK(inp); 1831 return (ECONNRESET); 1832 } 1833 if (sopt->sopt_dir == SOPT_SET) 1834 return (tcp_ctloutput_set(inp, sopt)); 1835 else if (sopt->sopt_dir == SOPT_GET) 1836 return (tcp_ctloutput_get(inp, sopt)); 1837 else 1838 panic("%s: sopt_dir $%d", __func__, sopt->sopt_dir); 1839 } 1840 1841 /* 1842 * If this assert becomes untrue, we need to change the size of the buf 1843 * variable in tcp_default_ctloutput(). 1844 */ 1845 #ifdef CTASSERT 1846 CTASSERT(TCP_CA_NAME_MAX <= TCP_LOG_ID_LEN); 1847 CTASSERT(TCP_LOG_REASON_LEN <= TCP_LOG_ID_LEN); 1848 #endif 1849 1850 extern struct cc_algo newreno_cc_algo; 1851 1852 static int 1853 tcp_set_cc_mod(struct inpcb *inp, struct sockopt *sopt) 1854 { 1855 struct cc_algo *algo; 1856 void *ptr = NULL; 1857 struct tcpcb *tp = intotcpcb(inp); 1858 struct cc_var cc_mem; 1859 char buf[TCP_CA_NAME_MAX]; 1860 size_t mem_sz; 1861 int error; 1862 1863 INP_WUNLOCK(inp); 1864 error = sooptcopyin(sopt, buf, TCP_CA_NAME_MAX - 1, 1); 1865 if (error) 1866 return(error); 1867 buf[sopt->sopt_valsize] = '\0'; 1868 CC_LIST_RLOCK(); 1869 STAILQ_FOREACH(algo, &cc_list, entries) { 1870 if (strncmp(buf, algo->name, 1871 TCP_CA_NAME_MAX) == 0) { 1872 if (algo->flags & CC_MODULE_BEING_REMOVED) { 1873 /* We can't "see" modules being unloaded */ 1874 continue; 1875 } 1876 break; 1877 } 1878 } 1879 if (algo == NULL) { 1880 CC_LIST_RUNLOCK(); 1881 return(ESRCH); 1882 } 1883 /* 1884 * With a reference the algorithm cannot be removed 1885 * so we hold a reference through the change process. 1886 */ 1887 cc_refer(algo); 1888 CC_LIST_RUNLOCK(); 1889 if (algo->cb_init != NULL) { 1890 /* We can now pre-get the memory for the CC */ 1891 mem_sz = (*algo->cc_data_sz)(); 1892 if (mem_sz == 0) { 1893 goto no_mem_needed; 1894 } 1895 ptr = malloc(mem_sz, M_CC_MEM, M_WAITOK); 1896 } else { 1897 no_mem_needed: 1898 mem_sz = 0; 1899 ptr = NULL; 1900 } 1901 /* 1902 * Make sure its all clean and zero and also get 1903 * back the inplock. 1904 */ 1905 memset(&cc_mem, 0, sizeof(cc_mem)); 1906 INP_WLOCK(inp); 1907 if (__predict_false(tp->t_flags & TF_DISCONNECTED)) { 1908 INP_WUNLOCK(inp); 1909 if (ptr) 1910 free(ptr, M_CC_MEM); 1911 /* Release our temp reference */ 1912 CC_LIST_RLOCK(); 1913 cc_release(algo); 1914 CC_LIST_RUNLOCK(); 1915 return (ECONNRESET); 1916 } 1917 if (ptr != NULL) 1918 memset(ptr, 0, mem_sz); 1919 cc_mem.tp = tp; 1920 /* 1921 * We once again hold a write lock over the tcb so it's 1922 * safe to do these things without ordering concerns. 1923 * Note here we init into stack memory. 1924 */ 1925 if (algo->cb_init != NULL) 1926 error = algo->cb_init(&cc_mem, ptr); 1927 else 1928 error = 0; 1929 /* 1930 * The CC algorithms, when given their memory 1931 * should not fail we could in theory have a 1932 * KASSERT here. 1933 */ 1934 if (error == 0) { 1935 /* 1936 * Touchdown, lets go ahead and move the 1937 * connection to the new CC module by 1938 * copying in the cc_mem after we call 1939 * the old ones cleanup (if any). 1940 */ 1941 if (CC_ALGO(tp)->cb_destroy != NULL) 1942 CC_ALGO(tp)->cb_destroy(&tp->t_ccv); 1943 /* Detach the old CC from the tcpcb */ 1944 cc_detach(tp); 1945 /* Copy in our temp memory that was inited */ 1946 memcpy(&tp->t_ccv, &cc_mem, sizeof(struct cc_var)); 1947 /* Now attach the new, which takes a reference */ 1948 cc_attach(tp, algo); 1949 /* Ok now are we where we have gotten past any conn_init? */ 1950 if (TCPS_HAVEESTABLISHED(tp->t_state) && (CC_ALGO(tp)->conn_init != NULL)) { 1951 /* Yep run the connection init for the new CC */ 1952 CC_ALGO(tp)->conn_init(&tp->t_ccv); 1953 } 1954 } else if (ptr) 1955 free(ptr, M_CC_MEM); 1956 INP_WUNLOCK(inp); 1957 /* Now lets release our temp reference */ 1958 CC_LIST_RLOCK(); 1959 cc_release(algo); 1960 CC_LIST_RUNLOCK(); 1961 return (error); 1962 } 1963 1964 int 1965 tcp_default_ctloutput(struct tcpcb *tp, struct sockopt *sopt) 1966 { 1967 struct inpcb *inp = tptoinpcb(tp); 1968 int error, opt, optval; 1969 u_int ui; 1970 struct tcp_info ti; 1971 #ifdef KERN_TLS 1972 struct tls_enable tls; 1973 struct socket *so = inp->inp_socket; 1974 #endif 1975 char *pbuf, buf[TCP_LOG_ID_LEN]; 1976 #ifdef STATS 1977 struct statsblob *sbp; 1978 #endif 1979 size_t len; 1980 1981 INP_WLOCK_ASSERT(inp); 1982 KASSERT((tp->t_flags & TF_DISCONNECTED) == 0, 1983 ("tp_flags == %x", tp->t_flags)); 1984 KASSERT(inp->inp_socket != NULL, ("inp_socket == NULL")); 1985 1986 switch (sopt->sopt_level) { 1987 #ifdef INET6 1988 case IPPROTO_IPV6: 1989 MPASS(inp->inp_vflag & INP_IPV6PROTO); 1990 switch (sopt->sopt_name) { 1991 case IPV6_USE_MIN_MTU: 1992 tcp6_use_min_mtu(tp); 1993 /* FALLTHROUGH */ 1994 } 1995 INP_WUNLOCK(inp); 1996 return (0); 1997 #endif 1998 #ifdef INET 1999 case IPPROTO_IP: 2000 INP_WUNLOCK(inp); 2001 return (0); 2002 #endif 2003 } 2004 2005 /* 2006 * For TCP_CCALGOOPT forward the control to CC module, for both 2007 * SOPT_SET and SOPT_GET. 2008 */ 2009 switch (sopt->sopt_name) { 2010 case TCP_CCALGOOPT: 2011 INP_WUNLOCK(inp); 2012 if (sopt->sopt_valsize > CC_ALGOOPT_LIMIT) 2013 return (EINVAL); 2014 pbuf = malloc(sopt->sopt_valsize, M_TEMP, M_WAITOK | M_ZERO); 2015 error = sooptcopyin(sopt, pbuf, sopt->sopt_valsize, 2016 sopt->sopt_valsize); 2017 if (error) { 2018 free(pbuf, M_TEMP); 2019 return (error); 2020 } 2021 INP_WLOCK_RECHECK_CLEANUP(inp, free(pbuf, M_TEMP)); 2022 if (CC_ALGO(tp)->ctl_output != NULL) 2023 error = CC_ALGO(tp)->ctl_output(&tp->t_ccv, sopt, pbuf); 2024 else 2025 error = ENOENT; 2026 INP_WUNLOCK(inp); 2027 if (error == 0 && sopt->sopt_dir == SOPT_GET) 2028 error = sooptcopyout(sopt, pbuf, sopt->sopt_valsize); 2029 free(pbuf, M_TEMP); 2030 return (error); 2031 } 2032 2033 switch (sopt->sopt_dir) { 2034 case SOPT_SET: 2035 switch (sopt->sopt_name) { 2036 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2037 case TCP_MD5SIG: 2038 INP_WUNLOCK(inp); 2039 if (!TCPMD5_ENABLED()) 2040 return (ENOPROTOOPT); 2041 error = TCPMD5_PCBCTL(inp, sopt); 2042 if (error) 2043 return (error); 2044 INP_WLOCK_RECHECK(inp); 2045 goto unlock_and_done; 2046 #endif /* IPSEC */ 2047 2048 case TCP_NODELAY: 2049 case TCP_NOOPT: 2050 INP_WUNLOCK(inp); 2051 error = sooptcopyin(sopt, &optval, sizeof optval, 2052 sizeof optval); 2053 if (error) 2054 return (error); 2055 2056 INP_WLOCK_RECHECK(inp); 2057 switch (sopt->sopt_name) { 2058 case TCP_NODELAY: 2059 opt = TF_NODELAY; 2060 break; 2061 case TCP_NOOPT: 2062 opt = TF_NOOPT; 2063 break; 2064 default: 2065 opt = 0; /* dead code to fool gcc */ 2066 break; 2067 } 2068 2069 if (optval) 2070 tp->t_flags |= opt; 2071 else 2072 tp->t_flags &= ~opt; 2073 unlock_and_done: 2074 #ifdef TCP_OFFLOAD 2075 if (tp->t_flags & TF_TOE) { 2076 tcp_offload_ctloutput(tp, sopt->sopt_dir, 2077 sopt->sopt_name); 2078 } 2079 #endif 2080 INP_WUNLOCK(inp); 2081 break; 2082 2083 case TCP_NOPUSH: 2084 INP_WUNLOCK(inp); 2085 error = sooptcopyin(sopt, &optval, sizeof optval, 2086 sizeof optval); 2087 if (error) 2088 return (error); 2089 2090 INP_WLOCK_RECHECK(inp); 2091 if (optval) 2092 tp->t_flags |= TF_NOPUSH; 2093 else if (tp->t_flags & TF_NOPUSH) { 2094 tp->t_flags &= ~TF_NOPUSH; 2095 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 2096 struct epoch_tracker et; 2097 2098 NET_EPOCH_ENTER(et); 2099 error = tcp_output_nodrop(tp); 2100 NET_EPOCH_EXIT(et); 2101 } 2102 } 2103 goto unlock_and_done; 2104 2105 case TCP_REMOTE_UDP_ENCAPS_PORT: 2106 INP_WUNLOCK(inp); 2107 error = sooptcopyin(sopt, &optval, sizeof optval, 2108 sizeof optval); 2109 if (error) 2110 return (error); 2111 if ((optval < TCP_TUNNELING_PORT_MIN) || 2112 (optval > TCP_TUNNELING_PORT_MAX)) { 2113 /* Its got to be in range */ 2114 return (EINVAL); 2115 } 2116 if ((V_tcp_udp_tunneling_port == 0) && (optval != 0)) { 2117 /* You have to have enabled a UDP tunneling port first */ 2118 return (EINVAL); 2119 } 2120 INP_WLOCK_RECHECK(inp); 2121 if (tp->t_state != TCPS_CLOSED) { 2122 /* You can't change after you are connected */ 2123 error = EINVAL; 2124 } else { 2125 /* Ok we are all good set the port */ 2126 tp->t_port = htons(optval); 2127 } 2128 goto unlock_and_done; 2129 2130 case TCP_MAXSEG: 2131 INP_WUNLOCK(inp); 2132 error = sooptcopyin(sopt, &optval, sizeof optval, 2133 sizeof optval); 2134 if (error) 2135 return (error); 2136 2137 INP_WLOCK_RECHECK(inp); 2138 if (optval > 0 && optval <= tp->t_maxseg && 2139 optval + 40 >= V_tcp_minmss) { 2140 tp->t_maxseg = optval; 2141 if (tp->t_maxseg < V_tcp_mssdflt) { 2142 /* 2143 * The MSS is so small we should not process incoming 2144 * SACK's since we are subject to attack in such a 2145 * case. 2146 */ 2147 tp->t_flags2 |= TF2_PROC_SACK_PROHIBIT; 2148 } else { 2149 tp->t_flags2 &= ~TF2_PROC_SACK_PROHIBIT; 2150 } 2151 } else 2152 error = EINVAL; 2153 goto unlock_and_done; 2154 2155 case TCP_INFO: 2156 INP_WUNLOCK(inp); 2157 error = EINVAL; 2158 break; 2159 2160 case TCP_STATS: 2161 INP_WUNLOCK(inp); 2162 #ifdef STATS 2163 error = sooptcopyin(sopt, &optval, sizeof optval, 2164 sizeof optval); 2165 if (error) 2166 return (error); 2167 2168 if (optval > 0) 2169 sbp = stats_blob_alloc( 2170 V_tcp_perconn_stats_dflt_tpl, 0); 2171 else 2172 sbp = NULL; 2173 2174 INP_WLOCK_RECHECK(inp); 2175 if ((tp->t_stats != NULL && sbp == NULL) || 2176 (tp->t_stats == NULL && sbp != NULL)) { 2177 struct statsblob *t = tp->t_stats; 2178 tp->t_stats = sbp; 2179 sbp = t; 2180 } 2181 INP_WUNLOCK(inp); 2182 2183 stats_blob_destroy(sbp); 2184 #else 2185 return (EOPNOTSUPP); 2186 #endif /* !STATS */ 2187 break; 2188 2189 case TCP_CONGESTION: 2190 error = tcp_set_cc_mod(inp, sopt); 2191 break; 2192 2193 case TCP_REUSPORT_LB_NUMA: 2194 INP_WUNLOCK(inp); 2195 error = sooptcopyin(sopt, &optval, sizeof(optval), 2196 sizeof(optval)); 2197 INP_WLOCK_RECHECK(inp); 2198 if (!error) 2199 error = in_pcblbgroup_numa(inp, optval); 2200 INP_WUNLOCK(inp); 2201 break; 2202 2203 #ifdef KERN_TLS 2204 case TCP_TXTLS_ENABLE: 2205 INP_WUNLOCK(inp); 2206 error = ktls_copyin_tls_enable(sopt, &tls); 2207 if (error != 0) 2208 break; 2209 error = ktls_enable_tx(so, &tls); 2210 ktls_cleanup_tls_enable(&tls); 2211 break; 2212 case TCP_TXTLS_MODE: 2213 INP_WUNLOCK(inp); 2214 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2215 if (error != 0) 2216 return (error); 2217 2218 INP_WLOCK_RECHECK(inp); 2219 error = ktls_set_tx_mode(so, ui); 2220 INP_WUNLOCK(inp); 2221 break; 2222 case TCP_RXTLS_ENABLE: 2223 INP_WUNLOCK(inp); 2224 error = ktls_copyin_tls_enable(sopt, &tls); 2225 if (error != 0) 2226 break; 2227 error = ktls_enable_rx(so, &tls); 2228 ktls_cleanup_tls_enable(&tls); 2229 break; 2230 #endif 2231 case TCP_MAXUNACKTIME: 2232 case TCP_KEEPIDLE: 2233 case TCP_KEEPINTVL: 2234 case TCP_KEEPINIT: 2235 INP_WUNLOCK(inp); 2236 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2237 if (error) 2238 return (error); 2239 2240 if (ui > (UINT_MAX / hz)) { 2241 error = EINVAL; 2242 break; 2243 } 2244 ui *= hz; 2245 2246 INP_WLOCK_RECHECK(inp); 2247 switch (sopt->sopt_name) { 2248 case TCP_MAXUNACKTIME: 2249 tp->t_maxunacktime = ui; 2250 break; 2251 2252 case TCP_KEEPIDLE: 2253 tp->t_keepidle = ui; 2254 /* 2255 * XXX: better check current remaining 2256 * timeout and "merge" it with new value. 2257 */ 2258 if ((tp->t_state > TCPS_LISTEN) && 2259 (tp->t_state <= TCPS_CLOSING)) 2260 tcp_timer_activate(tp, TT_KEEP, 2261 TP_KEEPIDLE(tp)); 2262 break; 2263 case TCP_KEEPINTVL: 2264 tp->t_keepintvl = ui; 2265 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2266 (TP_MAXIDLE(tp) > 0)) 2267 tcp_timer_activate(tp, TT_2MSL, 2268 TP_MAXIDLE(tp)); 2269 break; 2270 case TCP_KEEPINIT: 2271 tp->t_keepinit = ui; 2272 if (tp->t_state == TCPS_SYN_RECEIVED || 2273 tp->t_state == TCPS_SYN_SENT) 2274 tcp_timer_activate(tp, TT_KEEP, 2275 TP_KEEPINIT(tp)); 2276 break; 2277 } 2278 goto unlock_and_done; 2279 2280 case TCP_KEEPCNT: 2281 INP_WUNLOCK(inp); 2282 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 2283 if (error) 2284 return (error); 2285 2286 INP_WLOCK_RECHECK(inp); 2287 tp->t_keepcnt = ui; 2288 if ((tp->t_state == TCPS_FIN_WAIT_2) && 2289 (TP_MAXIDLE(tp) > 0)) 2290 tcp_timer_activate(tp, TT_2MSL, 2291 TP_MAXIDLE(tp)); 2292 goto unlock_and_done; 2293 2294 case TCP_FASTOPEN: { 2295 struct tcp_fastopen tfo_optval; 2296 2297 INP_WUNLOCK(inp); 2298 if (!V_tcp_fastopen_client_enable && 2299 !V_tcp_fastopen_server_enable) 2300 return (EPERM); 2301 2302 error = sooptcopyin(sopt, &tfo_optval, 2303 sizeof(tfo_optval), sizeof(int)); 2304 if (error) 2305 return (error); 2306 2307 INP_WLOCK_RECHECK(inp); 2308 if ((tp->t_state != TCPS_CLOSED) && 2309 (tp->t_state != TCPS_LISTEN)) { 2310 error = EINVAL; 2311 goto unlock_and_done; 2312 } 2313 if (tfo_optval.enable) { 2314 if (tp->t_state == TCPS_LISTEN) { 2315 if (!V_tcp_fastopen_server_enable) { 2316 error = EPERM; 2317 goto unlock_and_done; 2318 } 2319 2320 if (tp->t_tfo_pending == NULL) 2321 tp->t_tfo_pending = 2322 tcp_fastopen_alloc_counter(); 2323 } else { 2324 /* 2325 * If a pre-shared key was provided, 2326 * stash it in the client cookie 2327 * field of the tcpcb for use during 2328 * connect. 2329 */ 2330 if (sopt->sopt_valsize == 2331 sizeof(tfo_optval)) { 2332 memcpy(tp->t_tfo_cookie.client, 2333 tfo_optval.psk, 2334 TCP_FASTOPEN_PSK_LEN); 2335 tp->t_tfo_client_cookie_len = 2336 TCP_FASTOPEN_PSK_LEN; 2337 } 2338 } 2339 tp->t_flags |= TF_FASTOPEN; 2340 } else 2341 tp->t_flags &= ~TF_FASTOPEN; 2342 goto unlock_and_done; 2343 } 2344 2345 #ifdef TCP_BLACKBOX 2346 case TCP_LOG: 2347 INP_WUNLOCK(inp); 2348 error = sooptcopyin(sopt, &optval, sizeof optval, 2349 sizeof optval); 2350 if (error) 2351 return (error); 2352 2353 INP_WLOCK_RECHECK(inp); 2354 error = tcp_log_state_change(tp, optval); 2355 goto unlock_and_done; 2356 2357 case TCP_LOGBUF: 2358 INP_WUNLOCK(inp); 2359 error = EINVAL; 2360 break; 2361 2362 case TCP_LOGID: 2363 INP_WUNLOCK(inp); 2364 error = sooptcopyin(sopt, buf, TCP_LOG_ID_LEN - 1, 0); 2365 if (error) 2366 break; 2367 buf[sopt->sopt_valsize] = '\0'; 2368 INP_WLOCK_RECHECK(inp); 2369 error = tcp_log_set_id(tp, buf); 2370 /* tcp_log_set_id() unlocks the INP. */ 2371 break; 2372 2373 case TCP_LOGDUMP: 2374 case TCP_LOGDUMPID: 2375 INP_WUNLOCK(inp); 2376 error = 2377 sooptcopyin(sopt, buf, TCP_LOG_REASON_LEN - 1, 0); 2378 if (error) 2379 break; 2380 buf[sopt->sopt_valsize] = '\0'; 2381 INP_WLOCK_RECHECK(inp); 2382 if (sopt->sopt_name == TCP_LOGDUMP) { 2383 error = tcp_log_dump_tp_logbuf(tp, buf, 2384 M_WAITOK, true); 2385 INP_WUNLOCK(inp); 2386 } else { 2387 tcp_log_dump_tp_bucket_logbufs(tp, buf); 2388 /* 2389 * tcp_log_dump_tp_bucket_logbufs() drops the 2390 * INP lock. 2391 */ 2392 } 2393 break; 2394 #endif 2395 2396 default: 2397 INP_WUNLOCK(inp); 2398 error = ENOPROTOOPT; 2399 break; 2400 } 2401 break; 2402 2403 case SOPT_GET: 2404 tp = intotcpcb(inp); 2405 switch (sopt->sopt_name) { 2406 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2407 case TCP_MD5SIG: 2408 INP_WUNLOCK(inp); 2409 if (!TCPMD5_ENABLED()) 2410 return (ENOPROTOOPT); 2411 error = TCPMD5_PCBCTL(inp, sopt); 2412 break; 2413 #endif 2414 2415 case TCP_NODELAY: 2416 optval = tp->t_flags & TF_NODELAY; 2417 INP_WUNLOCK(inp); 2418 error = sooptcopyout(sopt, &optval, sizeof optval); 2419 break; 2420 case TCP_MAXSEG: 2421 optval = tp->t_maxseg; 2422 INP_WUNLOCK(inp); 2423 error = sooptcopyout(sopt, &optval, sizeof optval); 2424 break; 2425 case TCP_REMOTE_UDP_ENCAPS_PORT: 2426 optval = ntohs(tp->t_port); 2427 INP_WUNLOCK(inp); 2428 error = sooptcopyout(sopt, &optval, sizeof optval); 2429 break; 2430 case TCP_NOOPT: 2431 optval = tp->t_flags & TF_NOOPT; 2432 INP_WUNLOCK(inp); 2433 error = sooptcopyout(sopt, &optval, sizeof optval); 2434 break; 2435 case TCP_NOPUSH: 2436 optval = tp->t_flags & TF_NOPUSH; 2437 INP_WUNLOCK(inp); 2438 error = sooptcopyout(sopt, &optval, sizeof optval); 2439 break; 2440 case TCP_INFO: 2441 tcp_fill_info(tp, &ti); 2442 INP_WUNLOCK(inp); 2443 error = sooptcopyout(sopt, &ti, sizeof ti); 2444 break; 2445 case TCP_STATS: 2446 { 2447 #ifdef STATS 2448 int nheld; 2449 TYPEOF_MEMBER(struct statsblob, flags) sbflags = 0; 2450 2451 error = 0; 2452 socklen_t outsbsz = sopt->sopt_valsize; 2453 if (tp->t_stats == NULL) 2454 error = ENOENT; 2455 else if (outsbsz >= tp->t_stats->cursz) 2456 outsbsz = tp->t_stats->cursz; 2457 else if (outsbsz >= sizeof(struct statsblob)) 2458 outsbsz = sizeof(struct statsblob); 2459 else 2460 error = EINVAL; 2461 INP_WUNLOCK(inp); 2462 if (error) 2463 break; 2464 2465 sbp = sopt->sopt_val; 2466 nheld = atop(round_page(((vm_offset_t)sbp) + 2467 (vm_size_t)outsbsz) - trunc_page((vm_offset_t)sbp)); 2468 vm_page_t ma[nheld]; 2469 if (vm_fault_quick_hold_pages( 2470 &curproc->p_vmspace->vm_map, (vm_offset_t)sbp, 2471 outsbsz, VM_PROT_READ | VM_PROT_WRITE, ma, 2472 nheld) < 0) { 2473 error = EFAULT; 2474 break; 2475 } 2476 2477 if ((error = copyin_nofault(&(sbp->flags), &sbflags, 2478 SIZEOF_MEMBER(struct statsblob, flags)))) 2479 goto unhold; 2480 2481 INP_WLOCK_RECHECK(inp); 2482 error = stats_blob_snapshot(&sbp, outsbsz, tp->t_stats, 2483 sbflags | SB_CLONE_USRDSTNOFAULT); 2484 INP_WUNLOCK(inp); 2485 sopt->sopt_valsize = outsbsz; 2486 unhold: 2487 vm_page_unhold_pages(ma, nheld); 2488 #else 2489 INP_WUNLOCK(inp); 2490 error = EOPNOTSUPP; 2491 #endif /* !STATS */ 2492 break; 2493 } 2494 case TCP_CONGESTION: 2495 len = strlcpy(buf, CC_ALGO(tp)->name, TCP_CA_NAME_MAX); 2496 INP_WUNLOCK(inp); 2497 error = sooptcopyout(sopt, buf, len + 1); 2498 break; 2499 case TCP_MAXUNACKTIME: 2500 case TCP_KEEPIDLE: 2501 case TCP_KEEPINTVL: 2502 case TCP_KEEPINIT: 2503 case TCP_KEEPCNT: 2504 switch (sopt->sopt_name) { 2505 case TCP_MAXUNACKTIME: 2506 ui = TP_MAXUNACKTIME(tp) / hz; 2507 break; 2508 case TCP_KEEPIDLE: 2509 ui = TP_KEEPIDLE(tp) / hz; 2510 break; 2511 case TCP_KEEPINTVL: 2512 ui = TP_KEEPINTVL(tp) / hz; 2513 break; 2514 case TCP_KEEPINIT: 2515 ui = TP_KEEPINIT(tp) / hz; 2516 break; 2517 case TCP_KEEPCNT: 2518 ui = TP_KEEPCNT(tp); 2519 break; 2520 } 2521 INP_WUNLOCK(inp); 2522 error = sooptcopyout(sopt, &ui, sizeof(ui)); 2523 break; 2524 case TCP_FASTOPEN: 2525 optval = tp->t_flags & TF_FASTOPEN; 2526 INP_WUNLOCK(inp); 2527 error = sooptcopyout(sopt, &optval, sizeof optval); 2528 break; 2529 #ifdef TCP_BLACKBOX 2530 case TCP_LOG: 2531 optval = tcp_get_bblog_state(tp); 2532 INP_WUNLOCK(inp); 2533 error = sooptcopyout(sopt, &optval, sizeof(optval)); 2534 break; 2535 case TCP_LOGBUF: 2536 /* tcp_log_getlogbuf() does INP_WUNLOCK(inp) */ 2537 error = tcp_log_getlogbuf(sopt, tp); 2538 break; 2539 case TCP_LOGID: 2540 len = tcp_log_get_id(tp, buf); 2541 INP_WUNLOCK(inp); 2542 error = sooptcopyout(sopt, buf, len + 1); 2543 break; 2544 case TCP_LOGDUMP: 2545 case TCP_LOGDUMPID: 2546 INP_WUNLOCK(inp); 2547 error = EINVAL; 2548 break; 2549 #endif 2550 #ifdef KERN_TLS 2551 case TCP_TXTLS_MODE: 2552 error = ktls_get_tx_mode(so, &optval); 2553 INP_WUNLOCK(inp); 2554 if (error == 0) 2555 error = sooptcopyout(sopt, &optval, 2556 sizeof(optval)); 2557 break; 2558 case TCP_RXTLS_MODE: 2559 error = ktls_get_rx_mode(so, &optval); 2560 INP_WUNLOCK(inp); 2561 if (error == 0) 2562 error = sooptcopyout(sopt, &optval, 2563 sizeof(optval)); 2564 break; 2565 #endif 2566 default: 2567 INP_WUNLOCK(inp); 2568 error = ENOPROTOOPT; 2569 break; 2570 } 2571 break; 2572 } 2573 return (error); 2574 } 2575 #undef INP_WLOCK_RECHECK 2576 #undef INP_WLOCK_RECHECK_CLEANUP 2577 2578 /* 2579 * Initiate (or continue) disconnect. 2580 * If embryonic state, just send reset (once). 2581 * If in ``let data drain'' option and linger null, just drop. 2582 * Otherwise (hard), mark socket disconnecting and drop 2583 * current input data; switch states based on user close, and 2584 * send segment to peer (with FIN). 2585 */ 2586 static void 2587 tcp_disconnect(struct tcpcb *tp) 2588 { 2589 struct socket *so = tptosocket(tp); 2590 2591 NET_EPOCH_ASSERT(); 2592 INP_WLOCK_ASSERT(tptoinpcb(tp)); 2593 2594 /* 2595 * Neither tcp_close() nor tcp_drop() should return NULL, as the 2596 * socket is still open. 2597 */ 2598 if (tp->t_state < TCPS_ESTABLISHED && 2599 !(tp->t_state > TCPS_LISTEN && (tp->t_flags & TF_FASTOPEN))) { 2600 tp = tcp_close(tp); 2601 KASSERT(tp != NULL, 2602 ("tcp_disconnect: tcp_close() returned NULL")); 2603 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 2604 tp = tcp_drop(tp, 0); 2605 KASSERT(tp != NULL, 2606 ("tcp_disconnect: tcp_drop() returned NULL")); 2607 } else { 2608 soisdisconnecting(so); 2609 sbflush(&so->so_rcv); 2610 tcp_usrclosed(tp); 2611 if (!(tp->t_flags & TF_DISCONNECTED)) 2612 /* Ignore stack's drop request, we already at it. */ 2613 (void)tcp_output_nodrop(tp); 2614 } 2615 } 2616 2617 /* 2618 * User issued close, and wish to trail through shutdown states: 2619 * if never received SYN, just forget it. If got a SYN from peer, 2620 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 2621 * If already got a FIN from peer, then almost done; go to LAST_ACK 2622 * state. In all other cases, have already sent FIN to peer (e.g. 2623 * after PRU_SHUTDOWN), and just have to play tedious game waiting 2624 * for peer to send FIN or not respond to keep-alives, etc. 2625 * We can let the user exit from the close as soon as the FIN is acked. 2626 */ 2627 static void 2628 tcp_usrclosed(struct tcpcb *tp) 2629 { 2630 2631 NET_EPOCH_ASSERT(); 2632 INP_WLOCK_ASSERT(tptoinpcb(tp)); 2633 2634 switch (tp->t_state) { 2635 case TCPS_LISTEN: 2636 case TCPS_CLOSED: 2637 tp = tcp_close(tp); 2638 /* 2639 * tcp_close() should never return NULL here as the socket is 2640 * still open. 2641 */ 2642 KASSERT(tp != NULL, 2643 ("tcp_usrclosed: tcp_close() returned NULL")); 2644 break; 2645 2646 case TCPS_SYN_SENT: 2647 case TCPS_SYN_RECEIVED: 2648 tp->t_flags |= TF_NEEDFIN; 2649 break; 2650 2651 case TCPS_ESTABLISHED: 2652 tcp_state_change(tp, TCPS_FIN_WAIT_1); 2653 break; 2654 2655 case TCPS_CLOSE_WAIT: 2656 tcp_state_change(tp, TCPS_LAST_ACK); 2657 break; 2658 } 2659 if (tp->t_acktime == 0) 2660 tp->t_acktime = ticks; 2661 if (tp->t_state >= TCPS_FIN_WAIT_2) { 2662 tcp_free_sackholes(tp); 2663 soisdisconnected(tptosocket(tp)); 2664 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 2665 if (tp->t_state == TCPS_FIN_WAIT_2) { 2666 int timeout; 2667 2668 timeout = (tcp_fast_finwait2_recycle) ? 2669 tcp_finwait2_timeout : TP_MAXIDLE(tp); 2670 tcp_timer_activate(tp, TT_2MSL, timeout); 2671 } 2672 } 2673 } 2674 2675 #ifdef DDB 2676 static void 2677 db_print_indent(int indent) 2678 { 2679 int i; 2680 2681 for (i = 0; i < indent; i++) 2682 db_printf(" "); 2683 } 2684 2685 static void 2686 db_print_tstate(int t_state) 2687 { 2688 2689 switch (t_state) { 2690 case TCPS_CLOSED: 2691 db_printf("TCPS_CLOSED"); 2692 return; 2693 2694 case TCPS_LISTEN: 2695 db_printf("TCPS_LISTEN"); 2696 return; 2697 2698 case TCPS_SYN_SENT: 2699 db_printf("TCPS_SYN_SENT"); 2700 return; 2701 2702 case TCPS_SYN_RECEIVED: 2703 db_printf("TCPS_SYN_RECEIVED"); 2704 return; 2705 2706 case TCPS_ESTABLISHED: 2707 db_printf("TCPS_ESTABLISHED"); 2708 return; 2709 2710 case TCPS_CLOSE_WAIT: 2711 db_printf("TCPS_CLOSE_WAIT"); 2712 return; 2713 2714 case TCPS_FIN_WAIT_1: 2715 db_printf("TCPS_FIN_WAIT_1"); 2716 return; 2717 2718 case TCPS_CLOSING: 2719 db_printf("TCPS_CLOSING"); 2720 return; 2721 2722 case TCPS_LAST_ACK: 2723 db_printf("TCPS_LAST_ACK"); 2724 return; 2725 2726 case TCPS_FIN_WAIT_2: 2727 db_printf("TCPS_FIN_WAIT_2"); 2728 return; 2729 2730 case TCPS_TIME_WAIT: 2731 db_printf("TCPS_TIME_WAIT"); 2732 return; 2733 2734 default: 2735 db_printf("unknown"); 2736 return; 2737 } 2738 } 2739 2740 static void 2741 db_print_bblog_state(int state) 2742 { 2743 switch (state) { 2744 case TCP_LOG_STATE_RATIO_OFF: 2745 db_printf("TCP_LOG_STATE_RATIO_OFF"); 2746 break; 2747 case TCP_LOG_STATE_CLEAR: 2748 db_printf("TCP_LOG_STATE_CLEAR"); 2749 break; 2750 case TCP_LOG_STATE_OFF: 2751 db_printf("TCP_LOG_STATE_OFF"); 2752 break; 2753 case TCP_LOG_STATE_TAIL: 2754 db_printf("TCP_LOG_STATE_TAIL"); 2755 break; 2756 case TCP_LOG_STATE_HEAD: 2757 db_printf("TCP_LOG_STATE_HEAD"); 2758 break; 2759 case TCP_LOG_STATE_HEAD_AUTO: 2760 db_printf("TCP_LOG_STATE_HEAD_AUTO"); 2761 break; 2762 case TCP_LOG_STATE_CONTINUAL: 2763 db_printf("TCP_LOG_STATE_CONTINUAL"); 2764 break; 2765 case TCP_LOG_STATE_TAIL_AUTO: 2766 db_printf("TCP_LOG_STATE_TAIL_AUTO"); 2767 break; 2768 case TCP_LOG_VIA_BBPOINTS: 2769 db_printf("TCP_LOG_STATE_BBPOINTS"); 2770 break; 2771 default: 2772 db_printf("UNKNOWN(%d)", state); 2773 break; 2774 } 2775 } 2776 2777 static void 2778 db_print_tcpcb(struct tcpcb *tp, const char *name, int indent, bool show_bblog, 2779 bool show_inpcb, bool only_locked) 2780 { 2781 2782 if (only_locked && tp->t_inpcb.inp_lock.rw_lock == RW_UNLOCKED) 2783 return; 2784 2785 db_print_indent(indent); 2786 db_printf("%s at %p\n", name, tp); 2787 2788 indent += 2; 2789 2790 if (show_inpcb) 2791 db_print_inpcb(tptoinpcb(tp), "t_inpcb", indent); 2792 2793 db_print_indent(indent); 2794 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2795 TAILQ_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2796 2797 db_print_indent(indent); 2798 db_printf("t_callout: %p t_timers: %p\n", 2799 &tp->t_callout, &tp->t_timers); 2800 2801 db_print_indent(indent); 2802 db_printf("t_state: %d (", tp->t_state); 2803 db_print_tstate(tp->t_state); 2804 db_printf(")\n"); 2805 2806 db_print_indent(indent); 2807 db_printf("t_flags: 0x%b\n", tp->t_flags, TF_BITS); 2808 2809 db_print_indent(indent); 2810 db_printf("t_flags2: 0x%b\n", tp->t_flags2, TF2_BITS); 2811 2812 db_print_indent(indent); 2813 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: 0x%08x\n", 2814 tp->snd_una, tp->snd_max, tp->snd_nxt); 2815 2816 db_print_indent(indent); 2817 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2818 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2819 2820 db_print_indent(indent); 2821 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2822 tp->iss, tp->irs, tp->rcv_nxt); 2823 2824 db_print_indent(indent); 2825 db_printf("rcv_adv: 0x%08x rcv_wnd: %u rcv_up: 0x%08x\n", 2826 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2827 2828 db_print_indent(indent); 2829 db_printf("snd_wnd: %u snd_cwnd: %u\n", 2830 tp->snd_wnd, tp->snd_cwnd); 2831 2832 db_print_indent(indent); 2833 db_printf("snd_ssthresh: %u snd_recover: " 2834 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2835 2836 db_print_indent(indent); 2837 db_printf("t_rcvtime: %u t_startime: %u\n", 2838 tp->t_rcvtime, tp->t_starttime); 2839 2840 db_print_indent(indent); 2841 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2842 tp->t_rtttime, tp->t_rtseq); 2843 2844 db_print_indent(indent); 2845 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2846 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2847 2848 db_print_indent(indent); 2849 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u\n", 2850 tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin); 2851 2852 db_print_indent(indent); 2853 db_printf("t_rttupdated: %u max_sndwnd: %u t_softerror: %d\n", 2854 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2855 2856 db_print_indent(indent); 2857 db_printf("t_oobflags: 0x%b t_iobc: 0x%02x\n", tp->t_oobflags, 2858 TCPOOB_BITS, tp->t_iobc); 2859 2860 db_print_indent(indent); 2861 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2862 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2863 2864 db_print_indent(indent); 2865 db_printf("ts_recent: %u ts_recent_age: %u\n", 2866 tp->ts_recent, tp->ts_recent_age); 2867 2868 db_print_indent(indent); 2869 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2870 "%u\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2871 2872 db_print_indent(indent); 2873 db_printf("snd_ssthresh_prev: %u snd_recover_prev: 0x%08x " 2874 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2875 tp->snd_recover_prev, tp->t_badrxtwin); 2876 2877 db_print_indent(indent); 2878 db_printf("snd_numholes: %d snd_holes first: %p\n", 2879 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2880 2881 db_print_indent(indent); 2882 db_printf("snd_fack: 0x%08x rcv_numsacks: %d\n", 2883 tp->snd_fack, tp->rcv_numsacks); 2884 2885 /* Skip sackblks, sackhint. */ 2886 2887 db_print_indent(indent); 2888 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2889 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2890 2891 db_print_indent(indent); 2892 db_printf("t_fb.tfb_tcp_block_name: %s\n", tp->t_fb->tfb_tcp_block_name); 2893 2894 db_print_indent(indent); 2895 db_printf("t_cc.name: %s\n", tp->t_cc->name); 2896 2897 db_print_indent(indent); 2898 db_printf("_t_logstate: %d (", tp->_t_logstate); 2899 db_print_bblog_state(tp->_t_logstate); 2900 db_printf(")\n"); 2901 2902 db_print_indent(indent); 2903 db_printf("t_lognum: %d t_loglimit: %d t_logsn: %u\n", 2904 tp->t_lognum, tp->t_loglimit, tp->t_logsn); 2905 2906 if (show_bblog) { 2907 #ifdef TCP_BLACKBOX 2908 db_print_bblog_entries(&tp->t_logs, indent); 2909 #else 2910 db_print_indent(indent); 2911 db_printf("BBLog not supported\n"); 2912 #endif 2913 } 2914 } 2915 2916 DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2917 { 2918 struct tcpcb *tp; 2919 bool show_bblog, show_inpcb; 2920 2921 if (!have_addr) { 2922 db_printf("usage: show tcpcb[/bi] <addr>\n"); 2923 return; 2924 } 2925 show_bblog = strchr(modif, 'b') != NULL; 2926 show_inpcb = strchr(modif, 'i') != NULL; 2927 tp = (struct tcpcb *)addr; 2928 db_print_tcpcb(tp, "tcpcb", 0, show_bblog, show_inpcb, false); 2929 } 2930 2931 DB_SHOW_ALL_COMMAND(tcpcbs, db_show_all_tcpcbs) 2932 { 2933 VNET_ITERATOR_DECL(vnet_iter); 2934 struct inpcb *inp; 2935 bool only_locked, show_bblog, show_inpcb; 2936 2937 only_locked = strchr(modif, 'l') != NULL; 2938 show_bblog = strchr(modif, 'b') != NULL; 2939 show_inpcb = strchr(modif, 'i') != NULL; 2940 VNET_FOREACH(vnet_iter) { 2941 CURVNET_SET(vnet_iter); 2942 for (u_int i = 0; i <= V_tcbinfo.ipi_porthashmask; i++) 2943 CK_LIST_FOREACH(inp, &V_tcbinfo.ipi_porthashbase[i], 2944 inp_portlist) { 2945 db_print_tcpcb(intotcpcb(inp), "tcpcb", 0, 2946 show_bblog, show_inpcb, only_locked); 2947 if (db_pager_quit) 2948 goto break_hash; 2949 } 2950 break_hash: 2951 CK_LIST_FOREACH(inp, &V_tcbinfo.ipi_list_unconn, 2952 inp_unconn_list) { 2953 db_print_tcpcb(intotcpcb(inp), "tcpcb", 0, 2954 show_bblog, show_inpcb, only_locked); 2955 if (db_pager_quit) 2956 break; 2957 } 2958 CURVNET_RESTORE(); 2959 } 2960 } 2961 #endif 2962