92#ifdef TCPDEBUG 93#include <netinet/tcp_debug.h> 94#endif 95#ifdef TCP_OFFLOAD 96#include <netinet/tcp_offload.h> 97#endif 98 99/* 100 * TCP protocol interface to socket abstraction. 101 */ 102static int tcp_attach(struct socket *); 103#ifdef INET 104static int tcp_connect(struct tcpcb *, struct sockaddr *, 105 struct thread *td); 106#endif /* INET */ 107#ifdef INET6 108static int tcp6_connect(struct tcpcb *, struct sockaddr *, 109 struct thread *td); 110#endif /* INET6 */ 111static void tcp_disconnect(struct tcpcb *); 112static void tcp_usrclosed(struct tcpcb *); 113static void tcp_fill_info(struct tcpcb *, struct tcp_info *); 114 115#ifdef TCPDEBUG 116#define TCPDEBUG0 int ostate = 0 117#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 118#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 119 tcp_trace(TA_USER, ostate, tp, 0, 0, req) 120#else 121#define TCPDEBUG0 122#define TCPDEBUG1() 123#define TCPDEBUG2(req) 124#endif 125 126/* 127 * TCP attaches to socket via pru_attach(), reserving space, 128 * and an internet control block. 129 */ 130static int 131tcp_usr_attach(struct socket *so, int proto, struct thread *td) 132{ 133 struct inpcb *inp; 134 struct tcpcb *tp = NULL; 135 int error; 136 TCPDEBUG0; 137 138 inp = sotoinpcb(so); 139 KASSERT(inp == NULL, ("tcp_usr_attach: inp != NULL")); 140 TCPDEBUG1(); 141 142 error = tcp_attach(so); 143 if (error) 144 goto out; 145 146 if ((so->so_options & SO_LINGER) && so->so_linger == 0) 147 so->so_linger = TCP_LINGERTIME; 148 149 inp = sotoinpcb(so); 150 tp = intotcpcb(inp); 151out: 152 TCPDEBUG2(PRU_ATTACH); 153 TCP_PROBE2(debug__user, tp, PRU_ATTACH); 154 return error; 155} 156 157/* 158 * tcp_detach is called when the socket layer loses its final reference 159 * to the socket, be it a file descriptor reference, a reference from TCP, 160 * etc. At this point, there is only one case in which we will keep around 161 * inpcb state: time wait. 162 * 163 * This function can probably be re-absorbed back into tcp_usr_detach() now 164 * that there is a single detach path. 165 */ 166static void 167tcp_detach(struct socket *so, struct inpcb *inp) 168{ 169 struct tcpcb *tp; 170 171 INP_INFO_LOCK_ASSERT(&V_tcbinfo); 172 INP_WLOCK_ASSERT(inp); 173 174 KASSERT(so->so_pcb == inp, ("tcp_detach: so_pcb != inp")); 175 KASSERT(inp->inp_socket == so, ("tcp_detach: inp_socket != so")); 176 177 tp = intotcpcb(inp); 178 179 if (inp->inp_flags & INP_TIMEWAIT) { 180 /* 181 * There are two cases to handle: one in which the time wait 182 * state is being discarded (INP_DROPPED), and one in which 183 * this connection will remain in timewait. In the former, 184 * it is time to discard all state (except tcptw, which has 185 * already been discarded by the timewait close code, which 186 * should be further up the call stack somewhere). In the 187 * latter case, we detach from the socket, but leave the pcb 188 * present until timewait ends. 189 * 190 * XXXRW: Would it be cleaner to free the tcptw here? 191 * 192 * Astute question indeed, from twtcp perspective there are 193 * three cases to consider: 194 * 195 * #1 tcp_detach is called at tcptw creation time by 196 * tcp_twstart, then do not discard the newly created tcptw 197 * and leave inpcb present until timewait ends 198 * #2 tcp_detach is called at timewait end (or reuse) by 199 * tcp_twclose, then the tcptw has already been discarded 200 * (or reused) and inpcb is freed here 201 * #3 tcp_detach is called() after timewait ends (or reuse) 202 * (e.g. by soclose), then tcptw has already been discarded 203 * (or reused) and inpcb is freed here 204 * 205 * In all three cases the tcptw should not be freed here. 206 */ 207 if (inp->inp_flags & INP_DROPPED) { 208 KASSERT(tp == NULL, ("tcp_detach: INP_TIMEWAIT && " 209 "INP_DROPPED && tp != NULL")); 210 in_pcbdetach(inp); 211 in_pcbfree(inp); 212 } else { 213 in_pcbdetach(inp); 214 INP_WUNLOCK(inp); 215 } 216 } else { 217 /* 218 * If the connection is not in timewait, we consider two 219 * two conditions: one in which no further processing is 220 * necessary (dropped || embryonic), and one in which TCP is 221 * not yet done, but no longer requires the socket, so the 222 * pcb will persist for the time being. 223 * 224 * XXXRW: Does the second case still occur? 225 */ 226 if (inp->inp_flags & INP_DROPPED || 227 tp->t_state < TCPS_SYN_SENT) { 228 tcp_discardcb(tp); 229 in_pcbdetach(inp); 230 in_pcbfree(inp); 231 } else { 232 in_pcbdetach(inp); 233 INP_WUNLOCK(inp); 234 } 235 } 236} 237 238/* 239 * pru_detach() detaches the TCP protocol from the socket. 240 * If the protocol state is non-embryonic, then can't 241 * do this directly: have to initiate a pru_disconnect(), 242 * which may finish later; embryonic TCB's can just 243 * be discarded here. 244 */ 245static void 246tcp_usr_detach(struct socket *so) 247{ 248 struct inpcb *inp; 249 int rlock = 0; 250 251 inp = sotoinpcb(so); 252 KASSERT(inp != NULL, ("tcp_usr_detach: inp == NULL")); 253 if (!INP_INFO_WLOCKED(&V_tcbinfo)) { 254 INP_INFO_RLOCK(&V_tcbinfo); 255 rlock = 1; 256 } 257 INP_WLOCK(inp); 258 KASSERT(inp->inp_socket != NULL, 259 ("tcp_usr_detach: inp_socket == NULL")); 260 tcp_detach(so, inp); 261 if (rlock) 262 INP_INFO_RUNLOCK(&V_tcbinfo); 263} 264 265#ifdef INET 266/* 267 * Give the socket an address. 268 */ 269static int 270tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 271{ 272 int error = 0; 273 struct inpcb *inp; 274 struct tcpcb *tp = NULL; 275 struct sockaddr_in *sinp; 276 277 sinp = (struct sockaddr_in *)nam; 278 if (nam->sa_len != sizeof (*sinp)) 279 return (EINVAL); 280 /* 281 * Must check for multicast addresses and disallow binding 282 * to them. 283 */ 284 if (sinp->sin_family == AF_INET && 285 IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 286 return (EAFNOSUPPORT); 287 288 TCPDEBUG0; 289 inp = sotoinpcb(so); 290 KASSERT(inp != NULL, ("tcp_usr_bind: inp == NULL")); 291 INP_WLOCK(inp); 292 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 293 error = EINVAL; 294 goto out; 295 } 296 tp = intotcpcb(inp); 297 TCPDEBUG1(); 298 INP_HASH_WLOCK(&V_tcbinfo); 299 error = in_pcbbind(inp, nam, td->td_ucred); 300 INP_HASH_WUNLOCK(&V_tcbinfo); 301out: 302 TCPDEBUG2(PRU_BIND); 303 TCP_PROBE2(debug__user, tp, PRU_BIND); 304 INP_WUNLOCK(inp); 305 306 return (error); 307} 308#endif /* INET */ 309 310#ifdef INET6 311static int 312tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) 313{ 314 int error = 0; 315 struct inpcb *inp; 316 struct tcpcb *tp = NULL; 317 struct sockaddr_in6 *sin6p; 318 319 sin6p = (struct sockaddr_in6 *)nam; 320 if (nam->sa_len != sizeof (*sin6p)) 321 return (EINVAL); 322 /* 323 * Must check for multicast addresses and disallow binding 324 * to them. 325 */ 326 if (sin6p->sin6_family == AF_INET6 && 327 IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 328 return (EAFNOSUPPORT); 329 330 TCPDEBUG0; 331 inp = sotoinpcb(so); 332 KASSERT(inp != NULL, ("tcp6_usr_bind: inp == NULL")); 333 INP_WLOCK(inp); 334 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 335 error = EINVAL; 336 goto out; 337 } 338 tp = intotcpcb(inp); 339 TCPDEBUG1(); 340 INP_HASH_WLOCK(&V_tcbinfo); 341 inp->inp_vflag &= ~INP_IPV4; 342 inp->inp_vflag |= INP_IPV6; 343#ifdef INET 344 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { 345 if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 346 inp->inp_vflag |= INP_IPV4; 347 else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 348 struct sockaddr_in sin; 349 350 in6_sin6_2_sin(&sin, sin6p); 351 inp->inp_vflag |= INP_IPV4; 352 inp->inp_vflag &= ~INP_IPV6; 353 error = in_pcbbind(inp, (struct sockaddr *)&sin, 354 td->td_ucred); 355 INP_HASH_WUNLOCK(&V_tcbinfo); 356 goto out; 357 } 358 } 359#endif 360 error = in6_pcbbind(inp, nam, td->td_ucred); 361 INP_HASH_WUNLOCK(&V_tcbinfo); 362out: 363 TCPDEBUG2(PRU_BIND); 364 TCP_PROBE2(debug__user, tp, PRU_BIND); 365 INP_WUNLOCK(inp); 366 return (error); 367} 368#endif /* INET6 */ 369 370#ifdef INET 371/* 372 * Prepare to accept connections. 373 */ 374static int 375tcp_usr_listen(struct socket *so, int backlog, struct thread *td) 376{ 377 int error = 0; 378 struct inpcb *inp; 379 struct tcpcb *tp = NULL; 380 381 TCPDEBUG0; 382 inp = sotoinpcb(so); 383 KASSERT(inp != NULL, ("tcp_usr_listen: inp == NULL")); 384 INP_WLOCK(inp); 385 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 386 error = EINVAL; 387 goto out; 388 } 389 tp = intotcpcb(inp); 390 TCPDEBUG1(); 391 SOCK_LOCK(so); 392 error = solisten_proto_check(so); 393 INP_HASH_WLOCK(&V_tcbinfo); 394 if (error == 0 && inp->inp_lport == 0) 395 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 396 INP_HASH_WUNLOCK(&V_tcbinfo); 397 if (error == 0) { 398 tcp_state_change(tp, TCPS_LISTEN); 399 solisten_proto(so, backlog); 400#ifdef TCP_OFFLOAD 401 if ((so->so_options & SO_NO_OFFLOAD) == 0) 402 tcp_offload_listen_start(tp); 403#endif 404 } 405 SOCK_UNLOCK(so); 406 407out: 408 TCPDEBUG2(PRU_LISTEN); 409 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 410 INP_WUNLOCK(inp); 411 return (error); 412} 413#endif /* INET */ 414 415#ifdef INET6 416static int 417tcp6_usr_listen(struct socket *so, int backlog, struct thread *td) 418{ 419 int error = 0; 420 struct inpcb *inp; 421 struct tcpcb *tp = NULL; 422 423 TCPDEBUG0; 424 inp = sotoinpcb(so); 425 KASSERT(inp != NULL, ("tcp6_usr_listen: inp == NULL")); 426 INP_WLOCK(inp); 427 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 428 error = EINVAL; 429 goto out; 430 } 431 tp = intotcpcb(inp); 432 TCPDEBUG1(); 433 SOCK_LOCK(so); 434 error = solisten_proto_check(so); 435 INP_HASH_WLOCK(&V_tcbinfo); 436 if (error == 0 && inp->inp_lport == 0) { 437 inp->inp_vflag &= ~INP_IPV4; 438 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) 439 inp->inp_vflag |= INP_IPV4; 440 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 441 } 442 INP_HASH_WUNLOCK(&V_tcbinfo); 443 if (error == 0) { 444 tcp_state_change(tp, TCPS_LISTEN); 445 solisten_proto(so, backlog); 446#ifdef TCP_OFFLOAD 447 if ((so->so_options & SO_NO_OFFLOAD) == 0) 448 tcp_offload_listen_start(tp); 449#endif 450 } 451 SOCK_UNLOCK(so); 452 453out: 454 TCPDEBUG2(PRU_LISTEN); 455 TCP_PROBE2(debug__user, tp, PRU_LISTEN); 456 INP_WUNLOCK(inp); 457 return (error); 458} 459#endif /* INET6 */ 460 461#ifdef INET 462/* 463 * Initiate connection to peer. 464 * Create a template for use in transmissions on this connection. 465 * Enter SYN_SENT state, and mark socket as connecting. 466 * Start keep-alive timer, and seed output sequence space. 467 * Send initial segment on connection. 468 */ 469static int 470tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 471{ 472 int error = 0; 473 struct inpcb *inp; 474 struct tcpcb *tp = NULL; 475 struct sockaddr_in *sinp; 476 477 sinp = (struct sockaddr_in *)nam; 478 if (nam->sa_len != sizeof (*sinp)) 479 return (EINVAL); 480 /* 481 * Must disallow TCP ``connections'' to multicast addresses. 482 */ 483 if (sinp->sin_family == AF_INET 484 && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) 485 return (EAFNOSUPPORT); 486 if ((error = prison_remote_ip4(td->td_ucred, &sinp->sin_addr)) != 0) 487 return (error); 488 489 TCPDEBUG0; 490 inp = sotoinpcb(so); 491 KASSERT(inp != NULL, ("tcp_usr_connect: inp == NULL")); 492 INP_WLOCK(inp); 493 if (inp->inp_flags & INP_TIMEWAIT) { 494 error = EADDRINUSE; 495 goto out; 496 } 497 if (inp->inp_flags & INP_DROPPED) { 498 error = ECONNREFUSED; 499 goto out; 500 } 501 tp = intotcpcb(inp); 502 TCPDEBUG1(); 503 if ((error = tcp_connect(tp, nam, td)) != 0) 504 goto out; 505#ifdef TCP_OFFLOAD 506 if (registered_toedevs > 0 && 507 (so->so_options & SO_NO_OFFLOAD) == 0 && 508 (error = tcp_offload_connect(so, nam)) == 0) 509 goto out; 510#endif 511 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 512 error = tcp_output(tp); 513out: 514 TCPDEBUG2(PRU_CONNECT); 515 INP_WUNLOCK(inp); 516 return (error); 517} 518#endif /* INET */ 519 520#ifdef INET6 521static int 522tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) 523{ 524 int error = 0; 525 struct inpcb *inp; 526 struct tcpcb *tp = NULL; 527 struct sockaddr_in6 *sin6p; 528 529 TCPDEBUG0; 530 531 sin6p = (struct sockaddr_in6 *)nam; 532 if (nam->sa_len != sizeof (*sin6p)) 533 return (EINVAL); 534 /* 535 * Must disallow TCP ``connections'' to multicast addresses. 536 */ 537 if (sin6p->sin6_family == AF_INET6 538 && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) 539 return (EAFNOSUPPORT); 540 541 inp = sotoinpcb(so); 542 KASSERT(inp != NULL, ("tcp6_usr_connect: inp == NULL")); 543 INP_WLOCK(inp); 544 if (inp->inp_flags & INP_TIMEWAIT) { 545 error = EADDRINUSE; 546 goto out; 547 } 548 if (inp->inp_flags & INP_DROPPED) { 549 error = ECONNREFUSED; 550 goto out; 551 } 552 tp = intotcpcb(inp); 553 TCPDEBUG1(); 554#ifdef INET 555 /* 556 * XXXRW: Some confusion: V4/V6 flags relate to binding, and 557 * therefore probably require the hash lock, which isn't held here. 558 * Is this a significant problem? 559 */ 560 if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 561 struct sockaddr_in sin; 562 563 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { 564 error = EINVAL; 565 goto out; 566 } 567 568 in6_sin6_2_sin(&sin, sin6p); 569 inp->inp_vflag |= INP_IPV4; 570 inp->inp_vflag &= ~INP_IPV6; 571 if ((error = prison_remote_ip4(td->td_ucred, 572 &sin.sin_addr)) != 0) 573 goto out; 574 if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) 575 goto out; 576#ifdef TCP_OFFLOAD 577 if (registered_toedevs > 0 && 578 (so->so_options & SO_NO_OFFLOAD) == 0 && 579 (error = tcp_offload_connect(so, nam)) == 0) 580 goto out; 581#endif 582 error = tcp_output(tp); 583 goto out; 584 } 585#endif 586 inp->inp_vflag &= ~INP_IPV4; 587 inp->inp_vflag |= INP_IPV6; 588 inp->inp_inc.inc_flags |= INC_ISIPV6; 589 if ((error = prison_remote_ip6(td->td_ucred, &sin6p->sin6_addr)) != 0) 590 goto out; 591 if ((error = tcp6_connect(tp, nam, td)) != 0) 592 goto out; 593#ifdef TCP_OFFLOAD 594 if (registered_toedevs > 0 && 595 (so->so_options & SO_NO_OFFLOAD) == 0 && 596 (error = tcp_offload_connect(so, nam)) == 0) 597 goto out; 598#endif 599 tcp_timer_activate(tp, TT_KEEP, TP_KEEPINIT(tp)); 600 error = tcp_output(tp); 601 602out: 603 TCPDEBUG2(PRU_CONNECT); 604 TCP_PROBE2(debug__user, tp, PRU_CONNECT); 605 INP_WUNLOCK(inp); 606 return (error); 607} 608#endif /* INET6 */ 609 610/* 611 * Initiate disconnect from peer. 612 * If connection never passed embryonic stage, just drop; 613 * else if don't need to let data drain, then can just drop anyways, 614 * else have to begin TCP shutdown process: mark socket disconnecting, 615 * drain unread data, state switch to reflect user close, and 616 * send segment (e.g. FIN) to peer. Socket will be really disconnected 617 * when peer sends FIN and acks ours. 618 * 619 * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 620 */ 621static int 622tcp_usr_disconnect(struct socket *so) 623{ 624 struct inpcb *inp; 625 struct tcpcb *tp = NULL; 626 int error = 0; 627 628 TCPDEBUG0; 629 INP_INFO_RLOCK(&V_tcbinfo); 630 inp = sotoinpcb(so); 631 KASSERT(inp != NULL, ("tcp_usr_disconnect: inp == NULL")); 632 INP_WLOCK(inp); 633 if (inp->inp_flags & INP_TIMEWAIT) 634 goto out; 635 if (inp->inp_flags & INP_DROPPED) { 636 error = ECONNRESET; 637 goto out; 638 } 639 tp = intotcpcb(inp); 640 TCPDEBUG1(); 641 tcp_disconnect(tp); 642out: 643 TCPDEBUG2(PRU_DISCONNECT); 644 TCP_PROBE2(debug__user, tp, PRU_DISCONNECT); 645 INP_WUNLOCK(inp); 646 INP_INFO_RUNLOCK(&V_tcbinfo); 647 return (error); 648} 649 650#ifdef INET 651/* 652 * Accept a connection. Essentially all the work is done at higher levels; 653 * just return the address of the peer, storing through addr. 654 */ 655static int 656tcp_usr_accept(struct socket *so, struct sockaddr **nam) 657{ 658 int error = 0; 659 struct inpcb *inp = NULL; 660 struct tcpcb *tp = NULL; 661 struct in_addr addr; 662 in_port_t port = 0; 663 TCPDEBUG0; 664 665 if (so->so_state & SS_ISDISCONNECTED) 666 return (ECONNABORTED); 667 668 inp = sotoinpcb(so); 669 KASSERT(inp != NULL, ("tcp_usr_accept: inp == NULL")); 670 INP_WLOCK(inp); 671 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 672 error = ECONNABORTED; 673 goto out; 674 } 675 tp = intotcpcb(inp); 676 TCPDEBUG1(); 677 678 /* 679 * We inline in_getpeeraddr and COMMON_END here, so that we can 680 * copy the data of interest and defer the malloc until after we 681 * release the lock. 682 */ 683 port = inp->inp_fport; 684 addr = inp->inp_faddr; 685 686out: 687 TCPDEBUG2(PRU_ACCEPT); 688 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 689 INP_WUNLOCK(inp); 690 if (error == 0) 691 *nam = in_sockaddr(port, &addr); 692 return error; 693} 694#endif /* INET */ 695 696#ifdef INET6 697static int 698tcp6_usr_accept(struct socket *so, struct sockaddr **nam) 699{ 700 struct inpcb *inp = NULL; 701 int error = 0; 702 struct tcpcb *tp = NULL; 703 struct in_addr addr; 704 struct in6_addr addr6; 705 in_port_t port = 0; 706 int v4 = 0; 707 TCPDEBUG0; 708 709 if (so->so_state & SS_ISDISCONNECTED) 710 return (ECONNABORTED); 711 712 inp = sotoinpcb(so); 713 KASSERT(inp != NULL, ("tcp6_usr_accept: inp == NULL")); 714 INP_INFO_RLOCK(&V_tcbinfo); 715 INP_WLOCK(inp); 716 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 717 error = ECONNABORTED; 718 goto out; 719 } 720 tp = intotcpcb(inp); 721 TCPDEBUG1(); 722 723 /* 724 * We inline in6_mapped_peeraddr and COMMON_END here, so that we can 725 * copy the data of interest and defer the malloc until after we 726 * release the lock. 727 */ 728 if (inp->inp_vflag & INP_IPV4) { 729 v4 = 1; 730 port = inp->inp_fport; 731 addr = inp->inp_faddr; 732 } else { 733 port = inp->inp_fport; 734 addr6 = inp->in6p_faddr; 735 } 736 737out: 738 TCPDEBUG2(PRU_ACCEPT); 739 TCP_PROBE2(debug__user, tp, PRU_ACCEPT); 740 INP_WUNLOCK(inp); 741 INP_INFO_RUNLOCK(&V_tcbinfo); 742 if (error == 0) { 743 if (v4) 744 *nam = in6_v4mapsin6_sockaddr(port, &addr); 745 else 746 *nam = in6_sockaddr(port, &addr6); 747 } 748 return error; 749} 750#endif /* INET6 */ 751 752/* 753 * Mark the connection as being incapable of further output. 754 */ 755static int 756tcp_usr_shutdown(struct socket *so) 757{ 758 int error = 0; 759 struct inpcb *inp; 760 struct tcpcb *tp = NULL; 761 762 TCPDEBUG0; 763 INP_INFO_RLOCK(&V_tcbinfo); 764 inp = sotoinpcb(so); 765 KASSERT(inp != NULL, ("inp == NULL")); 766 INP_WLOCK(inp); 767 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 768 error = ECONNRESET; 769 goto out; 770 } 771 tp = intotcpcb(inp); 772 TCPDEBUG1(); 773 socantsendmore(so); 774 tcp_usrclosed(tp); 775 if (!(inp->inp_flags & INP_DROPPED)) 776 error = tcp_output(tp); 777 778out: 779 TCPDEBUG2(PRU_SHUTDOWN); 780 TCP_PROBE2(debug__user, tp, PRU_SHUTDOWN); 781 INP_WUNLOCK(inp); 782 INP_INFO_RUNLOCK(&V_tcbinfo); 783 784 return (error); 785} 786 787/* 788 * After a receive, possibly send window update to peer. 789 */ 790static int 791tcp_usr_rcvd(struct socket *so, int flags) 792{ 793 struct inpcb *inp; 794 struct tcpcb *tp = NULL; 795 int error = 0; 796 797 TCPDEBUG0; 798 inp = sotoinpcb(so); 799 KASSERT(inp != NULL, ("tcp_usr_rcvd: inp == NULL")); 800 INP_WLOCK(inp); 801 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 802 error = ECONNRESET; 803 goto out; 804 } 805 tp = intotcpcb(inp); 806 TCPDEBUG1(); 807#ifdef TCP_OFFLOAD 808 if (tp->t_flags & TF_TOE) 809 tcp_offload_rcvd(tp); 810 else 811#endif 812 tcp_output(tp); 813 814out: 815 TCPDEBUG2(PRU_RCVD); 816 TCP_PROBE2(debug__user, tp, PRU_RCVD); 817 INP_WUNLOCK(inp); 818 return (error); 819} 820 821/* 822 * Do a send by putting data in output queue and updating urgent 823 * marker if URG set. Possibly send more data. Unlike the other 824 * pru_*() routines, the mbuf chains are our responsibility. We 825 * must either enqueue them or free them. The other pru_* routines 826 * generally are caller-frees. 827 */ 828static int 829tcp_usr_send(struct socket *so, int flags, struct mbuf *m, 830 struct sockaddr *nam, struct mbuf *control, struct thread *td) 831{ 832 int error = 0; 833 struct inpcb *inp; 834 struct tcpcb *tp = NULL; 835#ifdef INET6 836 int isipv6; 837#endif 838 TCPDEBUG0; 839 840 /* 841 * We require the pcbinfo lock if we will close the socket as part of 842 * this call. 843 */ 844 if (flags & PRUS_EOF) 845 INP_INFO_RLOCK(&V_tcbinfo); 846 inp = sotoinpcb(so); 847 KASSERT(inp != NULL, ("tcp_usr_send: inp == NULL")); 848 INP_WLOCK(inp); 849 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 850 if (control) 851 m_freem(control); 852 /* 853 * In case of PRUS_NOTREADY, tcp_usr_ready() is responsible 854 * for freeing memory. 855 */ 856 if (m && (flags & PRUS_NOTREADY) == 0) 857 m_freem(m); 858 error = ECONNRESET; 859 goto out; 860 } 861#ifdef INET6 862 isipv6 = nam && nam->sa_family == AF_INET6; 863#endif /* INET6 */ 864 tp = intotcpcb(inp); 865 TCPDEBUG1(); 866 if (control) { 867 /* TCP doesn't do control messages (rights, creds, etc) */ 868 if (control->m_len) { 869 m_freem(control); 870 if (m) 871 m_freem(m); 872 error = EINVAL; 873 goto out; 874 } 875 m_freem(control); /* empty control, just free it */ 876 } 877 if (!(flags & PRUS_OOB)) { 878 sbappendstream(&so->so_snd, m, flags); 879 if (nam && tp->t_state < TCPS_SYN_SENT) { 880 /* 881 * Do implied connect if not yet connected, 882 * initialize window to default value, and 883 * initialize maxseg/maxopd using peer's cached 884 * MSS. 885 */ 886#ifdef INET6 887 if (isipv6) 888 error = tcp6_connect(tp, nam, td); 889#endif /* INET6 */ 890#if defined(INET6) && defined(INET) 891 else 892#endif 893#ifdef INET 894 error = tcp_connect(tp, nam, td); 895#endif 896 if (error) 897 goto out; 898 tp->snd_wnd = TTCP_CLIENT_SND_WND; 899 tcp_mss(tp, -1); 900 } 901 if (flags & PRUS_EOF) { 902 /* 903 * Close the send side of the connection after 904 * the data is sent. 905 */ 906 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 907 socantsendmore(so); 908 tcp_usrclosed(tp); 909 } 910 if (!(inp->inp_flags & INP_DROPPED) && 911 !(flags & PRUS_NOTREADY)) { 912 if (flags & PRUS_MORETOCOME) 913 tp->t_flags |= TF_MORETOCOME; 914 error = tcp_output(tp); 915 if (flags & PRUS_MORETOCOME) 916 tp->t_flags &= ~TF_MORETOCOME; 917 } 918 } else { 919 /* 920 * XXXRW: PRUS_EOF not implemented with PRUS_OOB? 921 */ 922 SOCKBUF_LOCK(&so->so_snd); 923 if (sbspace(&so->so_snd) < -512) { 924 SOCKBUF_UNLOCK(&so->so_snd); 925 m_freem(m); 926 error = ENOBUFS; 927 goto out; 928 } 929 /* 930 * According to RFC961 (Assigned Protocols), 931 * the urgent pointer points to the last octet 932 * of urgent data. We continue, however, 933 * to consider it to indicate the first octet 934 * of data past the urgent section. 935 * Otherwise, snd_up should be one lower. 936 */ 937 sbappendstream_locked(&so->so_snd, m, flags); 938 SOCKBUF_UNLOCK(&so->so_snd); 939 if (nam && tp->t_state < TCPS_SYN_SENT) { 940 /* 941 * Do implied connect if not yet connected, 942 * initialize window to default value, and 943 * initialize maxseg/maxopd using peer's cached 944 * MSS. 945 */ 946#ifdef INET6 947 if (isipv6) 948 error = tcp6_connect(tp, nam, td); 949#endif /* INET6 */ 950#if defined(INET6) && defined(INET) 951 else 952#endif 953#ifdef INET 954 error = tcp_connect(tp, nam, td); 955#endif 956 if (error) 957 goto out; 958 tp->snd_wnd = TTCP_CLIENT_SND_WND; 959 tcp_mss(tp, -1); 960 } 961 tp->snd_up = tp->snd_una + sbavail(&so->so_snd); 962 if (!(flags & PRUS_NOTREADY)) { 963 tp->t_flags |= TF_FORCEDATA; 964 error = tcp_output(tp); 965 tp->t_flags &= ~TF_FORCEDATA; 966 } 967 } 968out: 969 TCPDEBUG2((flags & PRUS_OOB) ? PRU_SENDOOB : 970 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 971 TCP_PROBE2(debug__user, tp, (flags & PRUS_OOB) ? PRU_SENDOOB : 972 ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 973 INP_WUNLOCK(inp); 974 if (flags & PRUS_EOF) 975 INP_INFO_RUNLOCK(&V_tcbinfo); 976 return (error); 977} 978 979static int 980tcp_usr_ready(struct socket *so, struct mbuf *m, int count) 981{ 982 struct inpcb *inp; 983 struct tcpcb *tp; 984 int error; 985 986 inp = sotoinpcb(so); 987 INP_WLOCK(inp); 988 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 989 INP_WUNLOCK(inp); 990 for (int i = 0; i < count; i++) 991 m = m_free(m); 992 return (ECONNRESET); 993 } 994 tp = intotcpcb(inp); 995 996 SOCKBUF_LOCK(&so->so_snd); 997 error = sbready(&so->so_snd, m, count); 998 SOCKBUF_UNLOCK(&so->so_snd); 999 if (error == 0) 1000 error = tcp_output(tp); 1001 INP_WUNLOCK(inp); 1002 1003 return (error); 1004} 1005 1006/* 1007 * Abort the TCP. Drop the connection abruptly. 1008 */ 1009static void 1010tcp_usr_abort(struct socket *so) 1011{ 1012 struct inpcb *inp; 1013 struct tcpcb *tp = NULL; 1014 TCPDEBUG0; 1015 1016 inp = sotoinpcb(so); 1017 KASSERT(inp != NULL, ("tcp_usr_abort: inp == NULL")); 1018 1019 INP_INFO_RLOCK(&V_tcbinfo); 1020 INP_WLOCK(inp); 1021 KASSERT(inp->inp_socket != NULL, 1022 ("tcp_usr_abort: inp_socket == NULL")); 1023 1024 /* 1025 * If we still have full TCP state, and we're not dropped, drop. 1026 */ 1027 if (!(inp->inp_flags & INP_TIMEWAIT) && 1028 !(inp->inp_flags & INP_DROPPED)) { 1029 tp = intotcpcb(inp); 1030 TCPDEBUG1(); 1031 tcp_drop(tp, ECONNABORTED); 1032 TCPDEBUG2(PRU_ABORT); 1033 TCP_PROBE2(debug__user, tp, PRU_ABORT); 1034 } 1035 if (!(inp->inp_flags & INP_DROPPED)) { 1036 SOCK_LOCK(so); 1037 so->so_state |= SS_PROTOREF; 1038 SOCK_UNLOCK(so); 1039 inp->inp_flags |= INP_SOCKREF; 1040 } 1041 INP_WUNLOCK(inp); 1042 INP_INFO_RUNLOCK(&V_tcbinfo); 1043} 1044 1045/* 1046 * TCP socket is closed. Start friendly disconnect. 1047 */ 1048static void 1049tcp_usr_close(struct socket *so) 1050{ 1051 struct inpcb *inp; 1052 struct tcpcb *tp = NULL; 1053 TCPDEBUG0; 1054 1055 inp = sotoinpcb(so); 1056 KASSERT(inp != NULL, ("tcp_usr_close: inp == NULL")); 1057 1058 INP_INFO_RLOCK(&V_tcbinfo); 1059 INP_WLOCK(inp); 1060 KASSERT(inp->inp_socket != NULL, 1061 ("tcp_usr_close: inp_socket == NULL")); 1062 1063 /* 1064 * If we still have full TCP state, and we're not dropped, initiate 1065 * a disconnect. 1066 */ 1067 if (!(inp->inp_flags & INP_TIMEWAIT) && 1068 !(inp->inp_flags & INP_DROPPED)) { 1069 tp = intotcpcb(inp); 1070 TCPDEBUG1(); 1071 tcp_disconnect(tp); 1072 TCPDEBUG2(PRU_CLOSE); 1073 TCP_PROBE2(debug__user, tp, PRU_CLOSE); 1074 } 1075 if (!(inp->inp_flags & INP_DROPPED)) { 1076 SOCK_LOCK(so); 1077 so->so_state |= SS_PROTOREF; 1078 SOCK_UNLOCK(so); 1079 inp->inp_flags |= INP_SOCKREF; 1080 } 1081 INP_WUNLOCK(inp); 1082 INP_INFO_RUNLOCK(&V_tcbinfo); 1083} 1084 1085/* 1086 * Receive out-of-band data. 1087 */ 1088static int 1089tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 1090{ 1091 int error = 0; 1092 struct inpcb *inp; 1093 struct tcpcb *tp = NULL; 1094 1095 TCPDEBUG0; 1096 inp = sotoinpcb(so); 1097 KASSERT(inp != NULL, ("tcp_usr_rcvoob: inp == NULL")); 1098 INP_WLOCK(inp); 1099 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1100 error = ECONNRESET; 1101 goto out; 1102 } 1103 tp = intotcpcb(inp); 1104 TCPDEBUG1(); 1105 if ((so->so_oobmark == 0 && 1106 (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) || 1107 so->so_options & SO_OOBINLINE || 1108 tp->t_oobflags & TCPOOB_HADDATA) { 1109 error = EINVAL; 1110 goto out; 1111 } 1112 if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 1113 error = EWOULDBLOCK; 1114 goto out; 1115 } 1116 m->m_len = 1; 1117 *mtod(m, caddr_t) = tp->t_iobc; 1118 if ((flags & MSG_PEEK) == 0) 1119 tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 1120 1121out: 1122 TCPDEBUG2(PRU_RCVOOB); 1123 TCP_PROBE2(debug__user, tp, PRU_RCVOOB); 1124 INP_WUNLOCK(inp); 1125 return (error); 1126} 1127 1128#ifdef INET 1129struct pr_usrreqs tcp_usrreqs = { 1130 .pru_abort = tcp_usr_abort, 1131 .pru_accept = tcp_usr_accept, 1132 .pru_attach = tcp_usr_attach, 1133 .pru_bind = tcp_usr_bind, 1134 .pru_connect = tcp_usr_connect, 1135 .pru_control = in_control, 1136 .pru_detach = tcp_usr_detach, 1137 .pru_disconnect = tcp_usr_disconnect, 1138 .pru_listen = tcp_usr_listen, 1139 .pru_peeraddr = in_getpeeraddr, 1140 .pru_rcvd = tcp_usr_rcvd, 1141 .pru_rcvoob = tcp_usr_rcvoob, 1142 .pru_send = tcp_usr_send, 1143 .pru_ready = tcp_usr_ready, 1144 .pru_shutdown = tcp_usr_shutdown, 1145 .pru_sockaddr = in_getsockaddr, 1146 .pru_sosetlabel = in_pcbsosetlabel, 1147 .pru_close = tcp_usr_close, 1148}; 1149#endif /* INET */ 1150 1151#ifdef INET6 1152struct pr_usrreqs tcp6_usrreqs = { 1153 .pru_abort = tcp_usr_abort, 1154 .pru_accept = tcp6_usr_accept, 1155 .pru_attach = tcp_usr_attach, 1156 .pru_bind = tcp6_usr_bind, 1157 .pru_connect = tcp6_usr_connect, 1158 .pru_control = in6_control, 1159 .pru_detach = tcp_usr_detach, 1160 .pru_disconnect = tcp_usr_disconnect, 1161 .pru_listen = tcp6_usr_listen, 1162 .pru_peeraddr = in6_mapped_peeraddr, 1163 .pru_rcvd = tcp_usr_rcvd, 1164 .pru_rcvoob = tcp_usr_rcvoob, 1165 .pru_send = tcp_usr_send, 1166 .pru_ready = tcp_usr_ready, 1167 .pru_shutdown = tcp_usr_shutdown, 1168 .pru_sockaddr = in6_mapped_sockaddr, 1169 .pru_sosetlabel = in_pcbsosetlabel, 1170 .pru_close = tcp_usr_close, 1171}; 1172#endif /* INET6 */ 1173 1174#ifdef INET 1175/* 1176 * Common subroutine to open a TCP connection to remote host specified 1177 * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 1178 * port number if needed. Call in_pcbconnect_setup to do the routing and 1179 * to choose a local host address (interface). If there is an existing 1180 * incarnation of the same connection in TIME-WAIT state and if the remote 1181 * host was sending CC options and if the connection duration was < MSL, then 1182 * truncate the previous TIME-WAIT state and proceed. 1183 * Initialize connection parameters and enter SYN-SENT state. 1184 */ 1185static int 1186tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1187{ 1188 struct inpcb *inp = tp->t_inpcb, *oinp; 1189 struct socket *so = inp->inp_socket; 1190 struct in_addr laddr; 1191 u_short lport; 1192 int error; 1193 1194 INP_WLOCK_ASSERT(inp); 1195 INP_HASH_WLOCK(&V_tcbinfo); 1196 1197 if (inp->inp_lport == 0) { 1198 error = in_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1199 if (error) 1200 goto out; 1201 } 1202 1203 /* 1204 * Cannot simply call in_pcbconnect, because there might be an 1205 * earlier incarnation of this same connection still in 1206 * TIME_WAIT state, creating an ADDRINUSE error. 1207 */ 1208 laddr = inp->inp_laddr; 1209 lport = inp->inp_lport; 1210 error = in_pcbconnect_setup(inp, nam, &laddr.s_addr, &lport, 1211 &inp->inp_faddr.s_addr, &inp->inp_fport, &oinp, td->td_ucred); 1212 if (error && oinp == NULL) 1213 goto out; 1214 if (oinp) { 1215 error = EADDRINUSE; 1216 goto out; 1217 } 1218 inp->inp_laddr = laddr; 1219 in_pcbrehash(inp); 1220 INP_HASH_WUNLOCK(&V_tcbinfo); 1221 1222 /* 1223 * Compute window scaling to request: 1224 * Scale to fit into sweet spot. See tcp_syncache.c. 1225 * XXX: This should move to tcp_output(). 1226 */ 1227 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1228 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1229 tp->request_r_scale++; 1230 1231 soisconnecting(so); 1232 TCPSTAT_INC(tcps_connattempt); 1233 tcp_state_change(tp, TCPS_SYN_SENT); 1234 tp->iss = tcp_new_isn(tp); 1235 tcp_sendseqinit(tp); 1236 1237 return 0; 1238 1239out: 1240 INP_HASH_WUNLOCK(&V_tcbinfo); 1241 return (error); 1242} 1243#endif /* INET */ 1244 1245#ifdef INET6 1246static int 1247tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) 1248{ 1249 struct inpcb *inp = tp->t_inpcb; 1250 int error; 1251 1252 INP_WLOCK_ASSERT(inp); 1253 INP_HASH_WLOCK(&V_tcbinfo); 1254 1255 if (inp->inp_lport == 0) { 1256 error = in6_pcbbind(inp, (struct sockaddr *)0, td->td_ucred); 1257 if (error) 1258 goto out; 1259 } 1260 error = in6_pcbconnect(inp, nam, td->td_ucred); 1261 if (error != 0) 1262 goto out; 1263 INP_HASH_WUNLOCK(&V_tcbinfo); 1264 1265 /* Compute window scaling to request. */ 1266 while (tp->request_r_scale < TCP_MAX_WINSHIFT && 1267 (TCP_MAXWIN << tp->request_r_scale) < sb_max) 1268 tp->request_r_scale++; 1269 1270 soisconnecting(inp->inp_socket); 1271 TCPSTAT_INC(tcps_connattempt); 1272 tcp_state_change(tp, TCPS_SYN_SENT); 1273 tp->iss = tcp_new_isn(tp); 1274 tcp_sendseqinit(tp); 1275 1276 return 0; 1277 1278out: 1279 INP_HASH_WUNLOCK(&V_tcbinfo); 1280 return error; 1281} 1282#endif /* INET6 */ 1283 1284/* 1285 * Export TCP internal state information via a struct tcp_info, based on the 1286 * Linux 2.6 API. Not ABI compatible as our constants are mapped differently 1287 * (TCP state machine, etc). We export all information using FreeBSD-native 1288 * constants -- for example, the numeric values for tcpi_state will differ 1289 * from Linux. 1290 */ 1291static void 1292tcp_fill_info(struct tcpcb *tp, struct tcp_info *ti) 1293{ 1294 1295 INP_WLOCK_ASSERT(tp->t_inpcb); 1296 bzero(ti, sizeof(*ti)); 1297 1298 ti->tcpi_state = tp->t_state; 1299 if ((tp->t_flags & TF_REQ_TSTMP) && (tp->t_flags & TF_RCVD_TSTMP)) 1300 ti->tcpi_options |= TCPI_OPT_TIMESTAMPS; 1301 if (tp->t_flags & TF_SACK_PERMIT) 1302 ti->tcpi_options |= TCPI_OPT_SACK; 1303 if ((tp->t_flags & TF_REQ_SCALE) && (tp->t_flags & TF_RCVD_SCALE)) { 1304 ti->tcpi_options |= TCPI_OPT_WSCALE; 1305 ti->tcpi_snd_wscale = tp->snd_scale; 1306 ti->tcpi_rcv_wscale = tp->rcv_scale; 1307 } 1308 1309 ti->tcpi_rto = tp->t_rxtcur * tick; 1310 ti->tcpi_last_data_recv = (long)(ticks - (int)tp->t_rcvtime) * tick; 1311 ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT; 1312 ti->tcpi_rttvar = ((u_int64_t)tp->t_rttvar * tick) >> TCP_RTTVAR_SHIFT; 1313 1314 ti->tcpi_snd_ssthresh = tp->snd_ssthresh; 1315 ti->tcpi_snd_cwnd = tp->snd_cwnd; 1316 1317 /* 1318 * FreeBSD-specific extension fields for tcp_info. 1319 */ 1320 ti->tcpi_rcv_space = tp->rcv_wnd; 1321 ti->tcpi_rcv_nxt = tp->rcv_nxt; 1322 ti->tcpi_snd_wnd = tp->snd_wnd; 1323 ti->tcpi_snd_bwnd = 0; /* Unused, kept for compat. */ 1324 ti->tcpi_snd_nxt = tp->snd_nxt; 1325 ti->tcpi_snd_mss = tp->t_maxseg; 1326 ti->tcpi_rcv_mss = tp->t_maxseg; 1327 if (tp->t_flags & TF_TOE) 1328 ti->tcpi_options |= TCPI_OPT_TOE; 1329 ti->tcpi_snd_rexmitpack = tp->t_sndrexmitpack; 1330 ti->tcpi_rcv_ooopack = tp->t_rcvoopack; 1331 ti->tcpi_snd_zerowin = tp->t_sndzerowin; 1332} 1333 1334/* 1335 * tcp_ctloutput() must drop the inpcb lock before performing copyin on 1336 * socket option arguments. When it re-acquires the lock after the copy, it 1337 * has to revalidate that the connection is still valid for the socket 1338 * option. 1339 */ 1340#define INP_WLOCK_RECHECK(inp) do { \ 1341 INP_WLOCK(inp); \ 1342 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { \ 1343 INP_WUNLOCK(inp); \ 1344 return (ECONNRESET); \ 1345 } \ 1346 tp = intotcpcb(inp); \ 1347} while(0) 1348 1349int 1350tcp_ctloutput(struct socket *so, struct sockopt *sopt) 1351{ 1352 int error, opt, optval; 1353 u_int ui; 1354 struct inpcb *inp; 1355 struct tcpcb *tp; 1356 struct tcp_info ti; 1357 char buf[TCP_CA_NAME_MAX]; 1358 struct cc_algo *algo; 1359 1360 error = 0; 1361 inp = sotoinpcb(so); 1362 KASSERT(inp != NULL, ("tcp_ctloutput: inp == NULL")); 1363 INP_WLOCK(inp); 1364 if (sopt->sopt_level != IPPROTO_TCP) { 1365#ifdef INET6 1366 if (inp->inp_vflag & INP_IPV6PROTO) { 1367 INP_WUNLOCK(inp); 1368 error = ip6_ctloutput(so, sopt); 1369 } 1370#endif /* INET6 */ 1371#if defined(INET6) && defined(INET) 1372 else 1373#endif 1374#ifdef INET 1375 { 1376 INP_WUNLOCK(inp); 1377 error = ip_ctloutput(so, sopt); 1378 } 1379#endif 1380 return (error); 1381 } 1382 if (inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) { 1383 INP_WUNLOCK(inp); 1384 return (ECONNRESET); 1385 } 1386 1387 switch (sopt->sopt_dir) { 1388 case SOPT_SET: 1389 switch (sopt->sopt_name) { 1390#ifdef TCP_SIGNATURE 1391 case TCP_MD5SIG: 1392 INP_WUNLOCK(inp); 1393 error = sooptcopyin(sopt, &optval, sizeof optval, 1394 sizeof optval); 1395 if (error) 1396 return (error); 1397 1398 INP_WLOCK_RECHECK(inp); 1399 if (optval > 0) 1400 tp->t_flags |= TF_SIGNATURE; 1401 else 1402 tp->t_flags &= ~TF_SIGNATURE; 1403 goto unlock_and_done; 1404#endif /* TCP_SIGNATURE */ 1405 1406 case TCP_NODELAY: 1407 case TCP_NOOPT: 1408 INP_WUNLOCK(inp); 1409 error = sooptcopyin(sopt, &optval, sizeof optval, 1410 sizeof optval); 1411 if (error) 1412 return (error); 1413 1414 INP_WLOCK_RECHECK(inp); 1415 switch (sopt->sopt_name) { 1416 case TCP_NODELAY: 1417 opt = TF_NODELAY; 1418 break; 1419 case TCP_NOOPT: 1420 opt = TF_NOOPT; 1421 break; 1422 default: 1423 opt = 0; /* dead code to fool gcc */ 1424 break; 1425 } 1426 1427 if (optval) 1428 tp->t_flags |= opt; 1429 else 1430 tp->t_flags &= ~opt; 1431unlock_and_done: 1432#ifdef TCP_OFFLOAD 1433 if (tp->t_flags & TF_TOE) { 1434 tcp_offload_ctloutput(tp, sopt->sopt_dir, 1435 sopt->sopt_name); 1436 } 1437#endif 1438 INP_WUNLOCK(inp); 1439 break; 1440 1441 case TCP_NOPUSH: 1442 INP_WUNLOCK(inp); 1443 error = sooptcopyin(sopt, &optval, sizeof optval, 1444 sizeof optval); 1445 if (error) 1446 return (error); 1447 1448 INP_WLOCK_RECHECK(inp); 1449 if (optval) 1450 tp->t_flags |= TF_NOPUSH; 1451 else if (tp->t_flags & TF_NOPUSH) { 1452 tp->t_flags &= ~TF_NOPUSH; 1453 if (TCPS_HAVEESTABLISHED(tp->t_state)) 1454 error = tcp_output(tp); 1455 } 1456 goto unlock_and_done; 1457 1458 case TCP_MAXSEG: 1459 INP_WUNLOCK(inp); 1460 error = sooptcopyin(sopt, &optval, sizeof optval, 1461 sizeof optval); 1462 if (error) 1463 return (error); 1464 1465 INP_WLOCK_RECHECK(inp); 1466 if (optval > 0 && optval <= tp->t_maxseg && 1467 optval + 40 >= V_tcp_minmss) 1468 tp->t_maxseg = optval; 1469 else 1470 error = EINVAL; 1471 goto unlock_and_done; 1472 1473 case TCP_INFO: 1474 INP_WUNLOCK(inp); 1475 error = EINVAL; 1476 break; 1477 1478 case TCP_CONGESTION: 1479 INP_WUNLOCK(inp); 1480 bzero(buf, sizeof(buf)); 1481 error = sooptcopyin(sopt, &buf, sizeof(buf), 1); 1482 if (error) 1483 break; 1484 INP_WLOCK_RECHECK(inp); 1485 /* 1486 * Return EINVAL if we can't find the requested cc algo. 1487 */ 1488 error = EINVAL; 1489 CC_LIST_RLOCK(); 1490 STAILQ_FOREACH(algo, &cc_list, entries) { 1491 if (strncmp(buf, algo->name, TCP_CA_NAME_MAX) 1492 == 0) { 1493 /* We've found the requested algo. */ 1494 error = 0; 1495 /* 1496 * We hold a write lock over the tcb 1497 * so it's safe to do these things 1498 * without ordering concerns. 1499 */ 1500 if (CC_ALGO(tp)->cb_destroy != NULL) 1501 CC_ALGO(tp)->cb_destroy(tp->ccv); 1502 CC_ALGO(tp) = algo; 1503 /* 1504 * If something goes pear shaped 1505 * initialising the new algo, 1506 * fall back to newreno (which 1507 * does not require initialisation). 1508 */ 1509 if (algo->cb_init != NULL) 1510 if (algo->cb_init(tp->ccv) > 0) { 1511 CC_ALGO(tp) = &newreno_cc_algo; 1512 /* 1513 * The only reason init 1514 * should fail is 1515 * because of malloc. 1516 */ 1517 error = ENOMEM; 1518 } 1519 break; /* Break the STAILQ_FOREACH. */ 1520 } 1521 } 1522 CC_LIST_RUNLOCK(); 1523 goto unlock_and_done; 1524 1525 case TCP_KEEPIDLE: 1526 case TCP_KEEPINTVL: 1527 case TCP_KEEPINIT: 1528 INP_WUNLOCK(inp); 1529 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1530 if (error) 1531 return (error); 1532 1533 if (ui > (UINT_MAX / hz)) { 1534 error = EINVAL; 1535 break; 1536 } 1537 ui *= hz; 1538 1539 INP_WLOCK_RECHECK(inp); 1540 switch (sopt->sopt_name) { 1541 case TCP_KEEPIDLE: 1542 tp->t_keepidle = ui; 1543 /* 1544 * XXX: better check current remaining 1545 * timeout and "merge" it with new value. 1546 */ 1547 if ((tp->t_state > TCPS_LISTEN) && 1548 (tp->t_state <= TCPS_CLOSING)) 1549 tcp_timer_activate(tp, TT_KEEP, 1550 TP_KEEPIDLE(tp)); 1551 break; 1552 case TCP_KEEPINTVL: 1553 tp->t_keepintvl = ui; 1554 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1555 (TP_MAXIDLE(tp) > 0)) 1556 tcp_timer_activate(tp, TT_2MSL, 1557 TP_MAXIDLE(tp)); 1558 break; 1559 case TCP_KEEPINIT: 1560 tp->t_keepinit = ui; 1561 if (tp->t_state == TCPS_SYN_RECEIVED || 1562 tp->t_state == TCPS_SYN_SENT) 1563 tcp_timer_activate(tp, TT_KEEP, 1564 TP_KEEPINIT(tp)); 1565 break; 1566 } 1567 goto unlock_and_done; 1568 1569 case TCP_KEEPCNT: 1570 INP_WUNLOCK(inp); 1571 error = sooptcopyin(sopt, &ui, sizeof(ui), sizeof(ui)); 1572 if (error) 1573 return (error); 1574 1575 INP_WLOCK_RECHECK(inp); 1576 tp->t_keepcnt = ui; 1577 if ((tp->t_state == TCPS_FIN_WAIT_2) && 1578 (TP_MAXIDLE(tp) > 0)) 1579 tcp_timer_activate(tp, TT_2MSL, 1580 TP_MAXIDLE(tp)); 1581 goto unlock_and_done; 1582
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1681 default: 1682 INP_WUNLOCK(inp); 1683 error = ENOPROTOOPT; 1684 break; 1685 } 1686 break; 1687 } 1688 return (error); 1689} 1690#undef INP_WLOCK_RECHECK 1691 1692/* 1693 * Attach TCP protocol to socket, allocating 1694 * internet protocol control block, tcp control block, 1695 * bufer space, and entering LISTEN state if to accept connections. 1696 */ 1697static int 1698tcp_attach(struct socket *so) 1699{ 1700 struct tcpcb *tp; 1701 struct inpcb *inp; 1702 int error; 1703 1704 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1705 error = soreserve(so, V_tcp_sendspace, V_tcp_recvspace); 1706 if (error) 1707 return (error); 1708 } 1709 so->so_rcv.sb_flags |= SB_AUTOSIZE; 1710 so->so_snd.sb_flags |= SB_AUTOSIZE; 1711 INP_INFO_RLOCK(&V_tcbinfo); 1712 error = in_pcballoc(so, &V_tcbinfo); 1713 if (error) { 1714 INP_INFO_RUNLOCK(&V_tcbinfo); 1715 return (error); 1716 } 1717 inp = sotoinpcb(so); 1718#ifdef INET6 1719 if (inp->inp_vflag & INP_IPV6PROTO) { 1720 inp->inp_vflag |= INP_IPV6; 1721 inp->in6p_hops = -1; /* use kernel default */ 1722 } 1723 else 1724#endif 1725 inp->inp_vflag |= INP_IPV4; 1726 tp = tcp_newtcpcb(inp); 1727 if (tp == NULL) { 1728 in_pcbdetach(inp); 1729 in_pcbfree(inp); 1730 INP_INFO_RUNLOCK(&V_tcbinfo); 1731 return (ENOBUFS); 1732 } 1733 tp->t_state = TCPS_CLOSED; 1734 INP_WUNLOCK(inp); 1735 INP_INFO_RUNLOCK(&V_tcbinfo); 1736 return (0); 1737} 1738 1739/* 1740 * Initiate (or continue) disconnect. 1741 * If embryonic state, just send reset (once). 1742 * If in ``let data drain'' option and linger null, just drop. 1743 * Otherwise (hard), mark socket disconnecting and drop 1744 * current input data; switch states based on user close, and 1745 * send segment to peer (with FIN). 1746 */ 1747static void 1748tcp_disconnect(struct tcpcb *tp) 1749{ 1750 struct inpcb *inp = tp->t_inpcb; 1751 struct socket *so = inp->inp_socket; 1752 1753 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1754 INP_WLOCK_ASSERT(inp); 1755 1756 /* 1757 * Neither tcp_close() nor tcp_drop() should return NULL, as the 1758 * socket is still open. 1759 */ 1760 if (tp->t_state < TCPS_ESTABLISHED) { 1761 tp = tcp_close(tp); 1762 KASSERT(tp != NULL, 1763 ("tcp_disconnect: tcp_close() returned NULL")); 1764 } else if ((so->so_options & SO_LINGER) && so->so_linger == 0) { 1765 tp = tcp_drop(tp, 0); 1766 KASSERT(tp != NULL, 1767 ("tcp_disconnect: tcp_drop() returned NULL")); 1768 } else { 1769 soisdisconnecting(so); 1770 sbflush(&so->so_rcv); 1771 tcp_usrclosed(tp); 1772 if (!(inp->inp_flags & INP_DROPPED)) 1773 tcp_output(tp); 1774 } 1775} 1776 1777/* 1778 * User issued close, and wish to trail through shutdown states: 1779 * if never received SYN, just forget it. If got a SYN from peer, 1780 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1781 * If already got a FIN from peer, then almost done; go to LAST_ACK 1782 * state. In all other cases, have already sent FIN to peer (e.g. 1783 * after PRU_SHUTDOWN), and just have to play tedious game waiting 1784 * for peer to send FIN or not respond to keep-alives, etc. 1785 * We can let the user exit from the close as soon as the FIN is acked. 1786 */ 1787static void 1788tcp_usrclosed(struct tcpcb *tp) 1789{ 1790 1791 INP_INFO_RLOCK_ASSERT(&V_tcbinfo); 1792 INP_WLOCK_ASSERT(tp->t_inpcb); 1793 1794 switch (tp->t_state) { 1795 case TCPS_LISTEN: 1796#ifdef TCP_OFFLOAD 1797 tcp_offload_listen_stop(tp); 1798#endif 1799 tcp_state_change(tp, TCPS_CLOSED); 1800 /* FALLTHROUGH */ 1801 case TCPS_CLOSED: 1802 tp = tcp_close(tp); 1803 /* 1804 * tcp_close() should never return NULL here as the socket is 1805 * still open. 1806 */ 1807 KASSERT(tp != NULL, 1808 ("tcp_usrclosed: tcp_close() returned NULL")); 1809 break; 1810 1811 case TCPS_SYN_SENT: 1812 case TCPS_SYN_RECEIVED: 1813 tp->t_flags |= TF_NEEDFIN; 1814 break; 1815 1816 case TCPS_ESTABLISHED: 1817 tcp_state_change(tp, TCPS_FIN_WAIT_1); 1818 break; 1819 1820 case TCPS_CLOSE_WAIT: 1821 tcp_state_change(tp, TCPS_LAST_ACK); 1822 break; 1823 } 1824 if (tp->t_state >= TCPS_FIN_WAIT_2) { 1825 soisdisconnected(tp->t_inpcb->inp_socket); 1826 /* Prevent the connection hanging in FIN_WAIT_2 forever. */ 1827 if (tp->t_state == TCPS_FIN_WAIT_2) { 1828 int timeout; 1829 1830 timeout = (tcp_fast_finwait2_recycle) ? 1831 tcp_finwait2_timeout : TP_MAXIDLE(tp); 1832 tcp_timer_activate(tp, TT_2MSL, timeout); 1833 } 1834 } 1835} 1836 1837#ifdef DDB 1838static void 1839db_print_indent(int indent) 1840{ 1841 int i; 1842 1843 for (i = 0; i < indent; i++) 1844 db_printf(" "); 1845} 1846 1847static void 1848db_print_tstate(int t_state) 1849{ 1850 1851 switch (t_state) { 1852 case TCPS_CLOSED: 1853 db_printf("TCPS_CLOSED"); 1854 return; 1855 1856 case TCPS_LISTEN: 1857 db_printf("TCPS_LISTEN"); 1858 return; 1859 1860 case TCPS_SYN_SENT: 1861 db_printf("TCPS_SYN_SENT"); 1862 return; 1863 1864 case TCPS_SYN_RECEIVED: 1865 db_printf("TCPS_SYN_RECEIVED"); 1866 return; 1867 1868 case TCPS_ESTABLISHED: 1869 db_printf("TCPS_ESTABLISHED"); 1870 return; 1871 1872 case TCPS_CLOSE_WAIT: 1873 db_printf("TCPS_CLOSE_WAIT"); 1874 return; 1875 1876 case TCPS_FIN_WAIT_1: 1877 db_printf("TCPS_FIN_WAIT_1"); 1878 return; 1879 1880 case TCPS_CLOSING: 1881 db_printf("TCPS_CLOSING"); 1882 return; 1883 1884 case TCPS_LAST_ACK: 1885 db_printf("TCPS_LAST_ACK"); 1886 return; 1887 1888 case TCPS_FIN_WAIT_2: 1889 db_printf("TCPS_FIN_WAIT_2"); 1890 return; 1891 1892 case TCPS_TIME_WAIT: 1893 db_printf("TCPS_TIME_WAIT"); 1894 return; 1895 1896 default: 1897 db_printf("unknown"); 1898 return; 1899 } 1900} 1901 1902static void 1903db_print_tflags(u_int t_flags) 1904{ 1905 int comma; 1906 1907 comma = 0; 1908 if (t_flags & TF_ACKNOW) { 1909 db_printf("%sTF_ACKNOW", comma ? ", " : ""); 1910 comma = 1; 1911 } 1912 if (t_flags & TF_DELACK) { 1913 db_printf("%sTF_DELACK", comma ? ", " : ""); 1914 comma = 1; 1915 } 1916 if (t_flags & TF_NODELAY) { 1917 db_printf("%sTF_NODELAY", comma ? ", " : ""); 1918 comma = 1; 1919 } 1920 if (t_flags & TF_NOOPT) { 1921 db_printf("%sTF_NOOPT", comma ? ", " : ""); 1922 comma = 1; 1923 } 1924 if (t_flags & TF_SENTFIN) { 1925 db_printf("%sTF_SENTFIN", comma ? ", " : ""); 1926 comma = 1; 1927 } 1928 if (t_flags & TF_REQ_SCALE) { 1929 db_printf("%sTF_REQ_SCALE", comma ? ", " : ""); 1930 comma = 1; 1931 } 1932 if (t_flags & TF_RCVD_SCALE) { 1933 db_printf("%sTF_RECVD_SCALE", comma ? ", " : ""); 1934 comma = 1; 1935 } 1936 if (t_flags & TF_REQ_TSTMP) { 1937 db_printf("%sTF_REQ_TSTMP", comma ? ", " : ""); 1938 comma = 1; 1939 } 1940 if (t_flags & TF_RCVD_TSTMP) { 1941 db_printf("%sTF_RCVD_TSTMP", comma ? ", " : ""); 1942 comma = 1; 1943 } 1944 if (t_flags & TF_SACK_PERMIT) { 1945 db_printf("%sTF_SACK_PERMIT", comma ? ", " : ""); 1946 comma = 1; 1947 } 1948 if (t_flags & TF_NEEDSYN) { 1949 db_printf("%sTF_NEEDSYN", comma ? ", " : ""); 1950 comma = 1; 1951 } 1952 if (t_flags & TF_NEEDFIN) { 1953 db_printf("%sTF_NEEDFIN", comma ? ", " : ""); 1954 comma = 1; 1955 } 1956 if (t_flags & TF_NOPUSH) { 1957 db_printf("%sTF_NOPUSH", comma ? ", " : ""); 1958 comma = 1; 1959 } 1960 if (t_flags & TF_MORETOCOME) { 1961 db_printf("%sTF_MORETOCOME", comma ? ", " : ""); 1962 comma = 1; 1963 } 1964 if (t_flags & TF_LQ_OVERFLOW) { 1965 db_printf("%sTF_LQ_OVERFLOW", comma ? ", " : ""); 1966 comma = 1; 1967 } 1968 if (t_flags & TF_LASTIDLE) { 1969 db_printf("%sTF_LASTIDLE", comma ? ", " : ""); 1970 comma = 1; 1971 } 1972 if (t_flags & TF_RXWIN0SENT) { 1973 db_printf("%sTF_RXWIN0SENT", comma ? ", " : ""); 1974 comma = 1; 1975 } 1976 if (t_flags & TF_FASTRECOVERY) { 1977 db_printf("%sTF_FASTRECOVERY", comma ? ", " : ""); 1978 comma = 1; 1979 } 1980 if (t_flags & TF_CONGRECOVERY) { 1981 db_printf("%sTF_CONGRECOVERY", comma ? ", " : ""); 1982 comma = 1; 1983 } 1984 if (t_flags & TF_WASFRECOVERY) { 1985 db_printf("%sTF_WASFRECOVERY", comma ? ", " : ""); 1986 comma = 1; 1987 } 1988 if (t_flags & TF_SIGNATURE) { 1989 db_printf("%sTF_SIGNATURE", comma ? ", " : ""); 1990 comma = 1; 1991 } 1992 if (t_flags & TF_FORCEDATA) { 1993 db_printf("%sTF_FORCEDATA", comma ? ", " : ""); 1994 comma = 1; 1995 } 1996 if (t_flags & TF_TSO) { 1997 db_printf("%sTF_TSO", comma ? ", " : ""); 1998 comma = 1; 1999 } 2000 if (t_flags & TF_ECN_PERMIT) { 2001 db_printf("%sTF_ECN_PERMIT", comma ? ", " : ""); 2002 comma = 1; 2003 } 2004} 2005 2006static void 2007db_print_toobflags(char t_oobflags) 2008{ 2009 int comma; 2010 2011 comma = 0; 2012 if (t_oobflags & TCPOOB_HAVEDATA) { 2013 db_printf("%sTCPOOB_HAVEDATA", comma ? ", " : ""); 2014 comma = 1; 2015 } 2016 if (t_oobflags & TCPOOB_HADDATA) { 2017 db_printf("%sTCPOOB_HADDATA", comma ? ", " : ""); 2018 comma = 1; 2019 } 2020} 2021 2022static void 2023db_print_tcpcb(struct tcpcb *tp, const char *name, int indent) 2024{ 2025 2026 db_print_indent(indent); 2027 db_printf("%s at %p\n", name, tp); 2028 2029 indent += 2; 2030 2031 db_print_indent(indent); 2032 db_printf("t_segq first: %p t_segqlen: %d t_dupacks: %d\n", 2033 LIST_FIRST(&tp->t_segq), tp->t_segqlen, tp->t_dupacks); 2034 2035 db_print_indent(indent); 2036 db_printf("tt_rexmt: %p tt_persist: %p tt_keep: %p\n", 2037 &tp->t_timers->tt_rexmt, &tp->t_timers->tt_persist, &tp->t_timers->tt_keep); 2038 2039 db_print_indent(indent); 2040 db_printf("tt_2msl: %p tt_delack: %p t_inpcb: %p\n", &tp->t_timers->tt_2msl, 2041 &tp->t_timers->tt_delack, tp->t_inpcb); 2042 2043 db_print_indent(indent); 2044 db_printf("t_state: %d (", tp->t_state); 2045 db_print_tstate(tp->t_state); 2046 db_printf(")\n"); 2047 2048 db_print_indent(indent); 2049 db_printf("t_flags: 0x%x (", tp->t_flags); 2050 db_print_tflags(tp->t_flags); 2051 db_printf(")\n"); 2052 2053 db_print_indent(indent); 2054 db_printf("snd_una: 0x%08x snd_max: 0x%08x snd_nxt: x0%08x\n", 2055 tp->snd_una, tp->snd_max, tp->snd_nxt); 2056 2057 db_print_indent(indent); 2058 db_printf("snd_up: 0x%08x snd_wl1: 0x%08x snd_wl2: 0x%08x\n", 2059 tp->snd_up, tp->snd_wl1, tp->snd_wl2); 2060 2061 db_print_indent(indent); 2062 db_printf("iss: 0x%08x irs: 0x%08x rcv_nxt: 0x%08x\n", 2063 tp->iss, tp->irs, tp->rcv_nxt); 2064 2065 db_print_indent(indent); 2066 db_printf("rcv_adv: 0x%08x rcv_wnd: %lu rcv_up: 0x%08x\n", 2067 tp->rcv_adv, tp->rcv_wnd, tp->rcv_up); 2068 2069 db_print_indent(indent); 2070 db_printf("snd_wnd: %lu snd_cwnd: %lu\n", 2071 tp->snd_wnd, tp->snd_cwnd); 2072 2073 db_print_indent(indent); 2074 db_printf("snd_ssthresh: %lu snd_recover: " 2075 "0x%08x\n", tp->snd_ssthresh, tp->snd_recover); 2076 2077 db_print_indent(indent); 2078 db_printf("t_maxopd: %u t_rcvtime: %u t_startime: %u\n", 2079 tp->t_maxopd, tp->t_rcvtime, tp->t_starttime); 2080 2081 db_print_indent(indent); 2082 db_printf("t_rttime: %u t_rtsq: 0x%08x\n", 2083 tp->t_rtttime, tp->t_rtseq); 2084 2085 db_print_indent(indent); 2086 db_printf("t_rxtcur: %d t_maxseg: %u t_srtt: %d\n", 2087 tp->t_rxtcur, tp->t_maxseg, tp->t_srtt); 2088 2089 db_print_indent(indent); 2090 db_printf("t_rttvar: %d t_rxtshift: %d t_rttmin: %u " 2091 "t_rttbest: %u\n", tp->t_rttvar, tp->t_rxtshift, tp->t_rttmin, 2092 tp->t_rttbest); 2093 2094 db_print_indent(indent); 2095 db_printf("t_rttupdated: %lu max_sndwnd: %lu t_softerror: %d\n", 2096 tp->t_rttupdated, tp->max_sndwnd, tp->t_softerror); 2097 2098 db_print_indent(indent); 2099 db_printf("t_oobflags: 0x%x (", tp->t_oobflags); 2100 db_print_toobflags(tp->t_oobflags); 2101 db_printf(") t_iobc: 0x%02x\n", tp->t_iobc); 2102 2103 db_print_indent(indent); 2104 db_printf("snd_scale: %u rcv_scale: %u request_r_scale: %u\n", 2105 tp->snd_scale, tp->rcv_scale, tp->request_r_scale); 2106 2107 db_print_indent(indent); 2108 db_printf("ts_recent: %u ts_recent_age: %u\n", 2109 tp->ts_recent, tp->ts_recent_age); 2110 2111 db_print_indent(indent); 2112 db_printf("ts_offset: %u last_ack_sent: 0x%08x snd_cwnd_prev: " 2113 "%lu\n", tp->ts_offset, tp->last_ack_sent, tp->snd_cwnd_prev); 2114 2115 db_print_indent(indent); 2116 db_printf("snd_ssthresh_prev: %lu snd_recover_prev: 0x%08x " 2117 "t_badrxtwin: %u\n", tp->snd_ssthresh_prev, 2118 tp->snd_recover_prev, tp->t_badrxtwin); 2119 2120 db_print_indent(indent); 2121 db_printf("snd_numholes: %d snd_holes first: %p\n", 2122 tp->snd_numholes, TAILQ_FIRST(&tp->snd_holes)); 2123 2124 db_print_indent(indent); 2125 db_printf("snd_fack: 0x%08x rcv_numsacks: %d sack_newdata: " 2126 "0x%08x\n", tp->snd_fack, tp->rcv_numsacks, tp->sack_newdata); 2127 2128 /* Skip sackblks, sackhint. */ 2129 2130 db_print_indent(indent); 2131 db_printf("t_rttlow: %d rfbuf_ts: %u rfbuf_cnt: %d\n", 2132 tp->t_rttlow, tp->rfbuf_ts, tp->rfbuf_cnt); 2133} 2134 2135DB_SHOW_COMMAND(tcpcb, db_show_tcpcb) 2136{ 2137 struct tcpcb *tp; 2138 2139 if (!have_addr) { 2140 db_printf("usage: show tcpcb <addr>\n"); 2141 return; 2142 } 2143 tp = (struct tcpcb *)addr; 2144 2145 db_print_tcpcb(tp, "tcpcb", 0); 2146} 2147#endif
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