tcp_timewait.c revision 55679
1/* 2 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 34 * $FreeBSD: head/sys/netinet/tcp_timewait.c 55679 2000-01-09 19:17:30Z shin $ 35 */ 36 37#include "opt_compat.h" 38#include "opt_inet6.h" 39#include "opt_tcpdebug.h" 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/callout.h> 44#include <sys/kernel.h> 45#include <sys/sysctl.h> 46#include <sys/malloc.h> 47#include <sys/mbuf.h> 48#ifdef INET6 49#include <sys/domain.h> 50#endif 51#include <sys/proc.h> 52#include <sys/socket.h> 53#include <sys/socketvar.h> 54#include <sys/protosw.h> 55 56#include <vm/vm_zone.h> 57 58#include <net/route.h> 59#include <net/if.h> 60 61#define _IP_VHL 62#include <netinet/in.h> 63#include <netinet/in_systm.h> 64#include <netinet/ip.h> 65#ifdef INET6 66#include <netinet/ip6.h> 67#endif 68#include <netinet/in_pcb.h> 69#ifdef INET6 70#include <netinet6/in6_pcb.h> 71#endif 72#include <netinet/in_var.h> 73#include <netinet/ip_var.h> 74#ifdef INET6 75#include <netinet6/ip6_var.h> 76#endif 77#include <netinet/tcp.h> 78#include <netinet/tcp_fsm.h> 79#include <netinet/tcp_seq.h> 80#include <netinet/tcp_timer.h> 81#include <netinet/tcp_var.h> 82#ifdef INET6 83#include <netinet6/tcp6_var.h> 84#endif 85#include <netinet/tcpip.h> 86#ifdef TCPDEBUG 87#include <netinet/tcp_debug.h> 88#endif 89#include <netinet6/ip6protosw.h> 90 91#ifdef IPSEC 92#include <netinet6/ipsec.h> 93#endif /*IPSEC*/ 94 95int tcp_mssdflt = TCP_MSS; 96SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, CTLFLAG_RW, 97 &tcp_mssdflt , 0, "Default TCP Maximum Segment Size"); 98 99#ifdef INET6 100int tcp_v6mssdflt = TCP6_MSS; 101SYSCTL_INT(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt, 102 CTLFLAG_RW, &tcp_v6mssdflt , 0, 103 "Default TCP Maximum Segment Size for IPv6"); 104#endif 105 106#if 0 107static int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; 108SYSCTL_INT(_net_inet_tcp, TCPCTL_RTTDFLT, rttdflt, CTLFLAG_RW, 109 &tcp_rttdflt , 0, "Default maximum TCP Round Trip Time"); 110#endif 111 112static int tcp_do_rfc1323 = 1; 113SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW, 114 &tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions"); 115 116static int tcp_do_rfc1644 = 0; 117SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW, 118 &tcp_do_rfc1644 , 0, "Enable rfc1644 (TTCP) extensions"); 119 120static int tcp_tcbhashsize = 0; 121SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD, 122 &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); 123 124static int do_tcpdrain = 1; 125SYSCTL_INT(_debug, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0, 126 "Enable non Net3 compliant tcp_drain"); 127 128SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD, 129 &tcbinfo.ipi_count, 0, "Number of active PCBs"); 130 131static void tcp_cleartaocache __P((void)); 132static void tcp_notify __P((struct inpcb *, int)); 133 134/* 135 * Target size of TCP PCB hash tables. Must be a power of two. 136 * 137 * Note that this can be overridden by the kernel environment 138 * variable net.inet.tcp.tcbhashsize 139 */ 140#ifndef TCBHASHSIZE 141#define TCBHASHSIZE 512 142#endif 143 144/* 145 * This is the actual shape of what we allocate using the zone 146 * allocator. Doing it this way allows us to protect both structures 147 * using the same generation count, and also eliminates the overhead 148 * of allocating tcpcbs separately. By hiding the structure here, 149 * we avoid changing most of the rest of the code (although it needs 150 * to be changed, eventually, for greater efficiency). 151 */ 152#define ALIGNMENT 32 153#define ALIGNM1 (ALIGNMENT - 1) 154struct inp_tp { 155 union { 156 struct inpcb inp; 157 char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1]; 158 } inp_tp_u; 159 struct tcpcb tcb; 160 struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl; 161 struct callout inp_tp_delack; 162}; 163#undef ALIGNMENT 164#undef ALIGNM1 165 166/* 167 * Tcp initialization 168 */ 169void 170tcp_init() 171{ 172 int hashsize; 173 174 tcp_iss = random(); /* wrong, but better than a constant */ 175 tcp_ccgen = 1; 176 tcp_cleartaocache(); 177 178 tcp_delacktime = TCPTV_DELACK; 179 tcp_keepinit = TCPTV_KEEP_INIT; 180 tcp_keepidle = TCPTV_KEEP_IDLE; 181 tcp_keepintvl = TCPTV_KEEPINTVL; 182 tcp_maxpersistidle = TCPTV_KEEP_IDLE; 183 tcp_msl = TCPTV_MSL; 184 185 LIST_INIT(&tcb); 186 tcbinfo.listhead = &tcb; 187 TUNABLE_INT_FETCH("net.inet.tcp.tcbhashsize", TCBHASHSIZE, hashsize); 188 if (!powerof2(hashsize)) { 189 printf("WARNING: TCB hash size not a power of 2\n"); 190 hashsize = 512; /* safe default */ 191 } 192 tcp_tcbhashsize = hashsize; 193 tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask); 194 tcbinfo.porthashbase = hashinit(hashsize, M_PCB, 195 &tcbinfo.porthashmask); 196 tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets, 197 ZONE_INTERRUPT, 0); 198#ifdef INET6 199#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr)) 200#else /* INET6 */ 201#define TCP_MINPROTOHDR (sizeof(struct tcpiphdr)) 202#endif /* INET6 */ 203 if (max_protohdr < TCP_MINPROTOHDR) 204 max_protohdr = TCP_MINPROTOHDR; 205 if (max_linkhdr + TCP_MINPROTOHDR > MHLEN) 206 panic("tcp_init"); 207#undef TCP_MINPROTOHDR 208} 209 210/* 211 * Create template to be used to send tcp packets on a connection. 212 * Call after host entry created, allocates an mbuf and fills 213 * in a skeletal tcp/ip header, minimizing the amount of work 214 * necessary when the connection is used. 215 */ 216struct tcptemp * 217tcp_template(tp) 218 struct tcpcb *tp; 219{ 220 register struct inpcb *inp = tp->t_inpcb; 221 register struct mbuf *m; 222 register struct tcptemp *n; 223 224 if ((n = tp->t_template) == 0) { 225 m = m_get(M_DONTWAIT, MT_HEADER); 226 if (m == NULL) 227 return (0); 228 m->m_len = sizeof (struct tcptemp); 229 n = mtod(m, struct tcptemp *); 230 } 231#ifdef INET6 232 if ((inp->inp_vflag & INP_IPV6) != 0) { 233 register struct ip6_hdr *ip6; 234 235 ip6 = (struct ip6_hdr *)n->tt_ipgen; 236 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 237 (inp->in6p_flowinfo & IPV6_FLOWINFO_MASK); 238 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 239 (IPV6_VERSION & IPV6_VERSION_MASK); 240 ip6->ip6_nxt = IPPROTO_TCP; 241 ip6->ip6_plen = sizeof(struct tcphdr); 242 ip6->ip6_src = inp->in6p_laddr; 243 ip6->ip6_dst = inp->in6p_faddr; 244 } else 245#endif 246 { 247 register struct ipovly *ipov; 248 249 ipov = (struct ipovly *)n->tt_ipgen; 250 bzero(ipov->ih_x1, sizeof(ipov->ih_x1)); 251 ipov->ih_pr = IPPROTO_TCP; 252 ipov->ih_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip)); 253 ipov->ih_src = inp->inp_laddr; 254 ipov->ih_dst = inp->inp_faddr; 255 } 256 n->tt_t.th_sport = inp->inp_lport; 257 n->tt_t.th_dport = inp->inp_fport; 258 n->tt_t.th_seq = 0; 259 n->tt_t.th_ack = 0; 260 n->tt_t.th_x2 = 0; 261 n->tt_t.th_off = 5; 262 n->tt_t.th_flags = 0; 263 n->tt_t.th_win = 0; 264 n->tt_t.th_sum = 0; 265 n->tt_t.th_urp = 0; 266 return (n); 267} 268 269/* 270 * Send a single message to the TCP at address specified by 271 * the given TCP/IP header. If m == 0, then we make a copy 272 * of the tcpiphdr at ti and send directly to the addressed host. 273 * This is used to force keep alive messages out using the TCP 274 * template for a connection tp->t_template. If flags are given 275 * then we send a message back to the TCP which originated the 276 * segment ti, and discard the mbuf containing it and any other 277 * attached mbufs. 278 * 279 * In any case the ack and sequence number of the transmitted 280 * segment are as specified by the parameters. 281 * 282 * NOTE: If m != NULL, then ti must point to *inside* the mbuf. 283 */ 284void 285tcp_respond(tp, ipgen, th, m, ack, seq, flags) 286 struct tcpcb *tp; 287 void *ipgen; 288 register struct tcphdr *th; 289 register struct mbuf *m; 290 tcp_seq ack, seq; 291 int flags; 292{ 293 register int tlen; 294 int win = 0; 295 struct route *ro = 0; 296 struct route sro; 297 struct ip *ip; 298 struct ipovly *ipov; 299 struct tcphdr *nth; 300#ifdef INET6 301 struct route_in6 *ro6 = 0; 302 struct route_in6 sro6; 303 struct ip6_hdr *ip6; 304 int isipv6; 305#endif /* INET6 */ 306 int ipflags = 0; 307 308#ifdef INET6 309 isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6; 310 ip6 = ipgen; 311#endif /* INET6 */ 312 ip = ipgen; 313 ipov = ipgen; 314 315 if (tp) { 316 if (!(flags & TH_RST)) 317 win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); 318#ifdef INET6 319 if (isipv6) 320 ro6 = &tp->t_inpcb->in6p_route; 321 else 322#endif /* INET6 */ 323 ro = &tp->t_inpcb->inp_route; 324 } else { 325#ifdef INET6 326 if (isipv6) { 327 ro6 = &sro6; 328 bzero(ro6, sizeof *ro6); 329 } else 330#endif /* INET6 */ 331 { 332 ro = &sro; 333 bzero(ro, sizeof *ro); 334 } 335 } 336 if (m == 0) { 337 m = m_gethdr(M_DONTWAIT, MT_HEADER); 338 if (m == NULL) 339 return; 340#ifdef TCP_COMPAT_42 341 tlen = 1; 342#else 343 tlen = 0; 344#endif 345 m->m_data += max_linkhdr; 346#ifdef INET6 347 if (isipv6) { 348 bcopy((caddr_t)ip6, mtod(m, caddr_t), 349 sizeof(struct ip6_hdr)); 350 ip6 = mtod(m, struct ip6_hdr *); 351 nth = (struct tcphdr *)(ip6 + 1); 352 } else 353#endif /* INET6 */ 354 { 355 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); 356 ip = mtod(m, struct ip *); 357 ipov = mtod(m, struct ipovly *); 358 nth = (struct tcphdr *)(ip + 1); 359 } 360 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr)); 361 flags = TH_ACK; 362 } else { 363 m_freem(m->m_next); 364 m->m_next = 0; 365 m->m_data = (caddr_t)ipgen; 366 /* m_len is set later */ 367 tlen = 0; 368#define xchg(a,b,type) { type t; t=a; a=b; b=t; } 369#ifdef INET6 370 if (isipv6) { 371 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); 372 nth = (struct tcphdr *)(ip6 + 1); 373 } else 374#endif /* INET6 */ 375 { 376 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, n_long); 377 nth = (struct tcphdr *)(ip + 1); 378 } 379 if (th != nth) { 380 /* 381 * this is usually a case when an extension header 382 * exists between the IPv6 header and the 383 * TCP header. 384 */ 385 nth->th_sport = th->th_sport; 386 nth->th_dport = th->th_dport; 387 } 388 xchg(nth->th_dport, nth->th_sport, n_short); 389#undef xchg 390 } 391#ifdef INET6 392 if (isipv6) { 393 ip6->ip6_plen = htons((u_short)(sizeof (struct tcphdr) + 394 tlen)); 395 tlen += sizeof (struct ip6_hdr) + sizeof (struct tcphdr); 396 } 397#endif 398 { 399 ipov->ih_len = htons((u_short)(sizeof (struct tcphdr) + tlen)); 400 tlen += sizeof (struct tcpiphdr); 401 } 402 m->m_len = tlen; 403 m->m_pkthdr.len = tlen; 404 m->m_pkthdr.rcvif = (struct ifnet *) 0; 405 nth->th_seq = htonl(seq); 406 nth->th_ack = htonl(ack); 407 nth->th_x2 = 0; 408 nth->th_off = sizeof (struct tcphdr) >> 2; 409 nth->th_flags = flags; 410 if (tp) 411 nth->th_win = htons((u_short) (win >> tp->rcv_scale)); 412 else 413 nth->th_win = htons((u_short)win); 414 nth->th_urp = 0; 415 nth->th_sum = 0; 416#ifdef INET6 417 if (isipv6) { 418 nth->th_sum = in6_cksum(m, IPPROTO_TCP, 419 sizeof(struct ip6_hdr), 420 tlen - sizeof(struct ip6_hdr)); 421 ip6->ip6_plen = htons((u_short)tlen); 422 ip6->ip6_hlim = in6_selecthlim(tp ? tp->t_inpcb : NULL, 423 ro6 && ro6->ro_rt ? 424 ro6->ro_rt->rt_ifp : 425 NULL); 426 } else 427#endif /* INET6 */ 428 { 429 bzero(ipov->ih_x1, sizeof(ipov->ih_x1)); 430 nth->th_sum = in_cksum(m, tlen); 431#ifdef INET6 432 /* Re-initialization for later version check */ 433 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, 0); 434#endif /* INET6 */ 435 ip->ip_len = tlen; 436 ip->ip_ttl = ip_defttl; 437 } 438#ifdef TCPDEBUG 439 if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)) 440 tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0); 441#endif 442#ifdef IPSEC 443 if (tp != NULL) { 444 m->m_pkthdr.rcvif = (struct ifnet *)tp->t_inpcb->inp_socket; 445 ipflags |= 446#ifdef INET6 447 isipv6 ? IPV6_SOCKINMRCVIF : 448#endif 449 IP_SOCKINMRCVIF; 450 } 451#endif 452#ifdef INET6 453 if (isipv6) { 454 (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL); 455 if (ro6 == &sro6 && ro6->ro_rt) 456 RTFREE(ro6->ro_rt); 457 } else 458#endif /* INET6 */ 459 { 460 (void) ip_output(m, NULL, ro, ipflags, NULL); 461 if (ro == &sro && ro->ro_rt) { 462 RTFREE(ro->ro_rt); 463 } 464 } 465} 466 467/* 468 * Create a new TCP control block, making an 469 * empty reassembly queue and hooking it to the argument 470 * protocol control block. The `inp' parameter must have 471 * come from the zone allocator set up in tcp_init(). 472 */ 473struct tcpcb * 474tcp_newtcpcb(inp) 475 struct inpcb *inp; 476{ 477 struct inp_tp *it; 478 register struct tcpcb *tp; 479#ifdef INET6 480 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 481#endif /* INET6 */ 482 483 it = (struct inp_tp *)inp; 484 tp = &it->tcb; 485 bzero((char *) tp, sizeof(struct tcpcb)); 486 LIST_INIT(&tp->t_segq); 487 tp->t_maxseg = tp->t_maxopd = 488#ifdef INET6 489 isipv6 ? tcp_v6mssdflt : 490#endif /* INET6 */ 491 tcp_mssdflt; 492 493 /* Set up our timeouts. */ 494 callout_init(tp->tt_rexmt = &it->inp_tp_rexmt); 495 callout_init(tp->tt_persist = &it->inp_tp_persist); 496 callout_init(tp->tt_keep = &it->inp_tp_keep); 497 callout_init(tp->tt_2msl = &it->inp_tp_2msl); 498 callout_init(tp->tt_delack = &it->inp_tp_delack); 499 500 if (tcp_do_rfc1323) 501 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP); 502 if (tcp_do_rfc1644) 503 tp->t_flags |= TF_REQ_CC; 504 tp->t_inpcb = inp; /* XXX */ 505 /* 506 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no 507 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives 508 * reasonable initial retransmit time. 509 */ 510 tp->t_srtt = TCPTV_SRTTBASE; 511 tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4; 512 tp->t_rttmin = TCPTV_MIN; 513 tp->t_rxtcur = TCPTV_RTOBASE; 514 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; 515 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; 516 tp->t_rcvtime = ticks; 517#ifdef INET6 518 if (isipv6 != 0) 519 inp->in6p_ip6_hlim = in6_selecthlim(inp, 520 inp->in6p_route.ro_rt ? 521 inp->in6p_route.ro_rt->rt_ifp : 522 NULL); 523 else 524#endif 525 inp->inp_ip_ttl = ip_defttl; 526 inp->inp_ppcb = (caddr_t)tp; 527 return (tp); /* XXX */ 528} 529 530/* 531 * Drop a TCP connection, reporting 532 * the specified error. If connection is synchronized, 533 * then send a RST to peer. 534 */ 535struct tcpcb * 536tcp_drop(tp, errno) 537 register struct tcpcb *tp; 538 int errno; 539{ 540 struct socket *so = tp->t_inpcb->inp_socket; 541 542 if (TCPS_HAVERCVDSYN(tp->t_state)) { 543 tp->t_state = TCPS_CLOSED; 544 (void) tcp_output(tp); 545 tcpstat.tcps_drops++; 546 } else 547 tcpstat.tcps_conndrops++; 548 if (errno == ETIMEDOUT && tp->t_softerror) 549 errno = tp->t_softerror; 550 so->so_error = errno; 551 return (tcp_close(tp)); 552} 553 554/* 555 * Close a TCP control block: 556 * discard all space held by the tcp 557 * discard internet protocol block 558 * wake up any sleepers 559 */ 560struct tcpcb * 561tcp_close(tp) 562 register struct tcpcb *tp; 563{ 564 register struct tseg_qent *q; 565 struct inpcb *inp = tp->t_inpcb; 566 struct socket *so = inp->inp_socket; 567#ifdef INET6 568 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 569#endif /* INET6 */ 570 register struct rtentry *rt; 571 int dosavessthresh; 572 573 /* 574 * Make sure that all of our timers are stopped before we 575 * delete the PCB. 576 */ 577 callout_stop(tp->tt_rexmt); 578 callout_stop(tp->tt_persist); 579 callout_stop(tp->tt_keep); 580 callout_stop(tp->tt_2msl); 581 callout_stop(tp->tt_delack); 582 583 /* 584 * If we got enough samples through the srtt filter, 585 * save the rtt and rttvar in the routing entry. 586 * 'Enough' is arbitrarily defined as the 16 samples. 587 * 16 samples is enough for the srtt filter to converge 588 * to within 5% of the correct value; fewer samples and 589 * we could save a very bogus rtt. 590 * 591 * Don't update the default route's characteristics and don't 592 * update anything that the user "locked". 593 */ 594 if (tp->t_rttupdated >= 16) { 595 register u_long i = 0; 596#ifdef INET6 597 if (isipv6) { 598 struct sockaddr_in6 *sin6; 599 600 if ((rt = inp->in6p_route.ro_rt) == NULL) 601 goto no_valid_rt; 602 sin6 = (struct sockaddr_in6 *)rt_key(rt); 603 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 604 goto no_valid_rt; 605 } 606 else 607#endif /* INET6 */ 608 if ((rt = inp->inp_route.ro_rt) == NULL || 609 ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr 610 == INADDR_ANY) 611 goto no_valid_rt; 612 613 if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { 614 i = tp->t_srtt * 615 (RTM_RTTUNIT / (hz * TCP_RTT_SCALE)); 616 if (rt->rt_rmx.rmx_rtt && i) 617 /* 618 * filter this update to half the old & half 619 * the new values, converting scale. 620 * See route.h and tcp_var.h for a 621 * description of the scaling constants. 622 */ 623 rt->rt_rmx.rmx_rtt = 624 (rt->rt_rmx.rmx_rtt + i) / 2; 625 else 626 rt->rt_rmx.rmx_rtt = i; 627 tcpstat.tcps_cachedrtt++; 628 } 629 if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { 630 i = tp->t_rttvar * 631 (RTM_RTTUNIT / (hz * TCP_RTTVAR_SCALE)); 632 if (rt->rt_rmx.rmx_rttvar && i) 633 rt->rt_rmx.rmx_rttvar = 634 (rt->rt_rmx.rmx_rttvar + i) / 2; 635 else 636 rt->rt_rmx.rmx_rttvar = i; 637 tcpstat.tcps_cachedrttvar++; 638 } 639 /* 640 * The old comment here said: 641 * update the pipelimit (ssthresh) if it has been updated 642 * already or if a pipesize was specified & the threshhold 643 * got below half the pipesize. I.e., wait for bad news 644 * before we start updating, then update on both good 645 * and bad news. 646 * 647 * But we want to save the ssthresh even if no pipesize is 648 * specified explicitly in the route, because such 649 * connections still have an implicit pipesize specified 650 * by the global tcp_sendspace. In the absence of a reliable 651 * way to calculate the pipesize, it will have to do. 652 */ 653 i = tp->snd_ssthresh; 654 if (rt->rt_rmx.rmx_sendpipe != 0) 655 dosavessthresh = (i < rt->rt_rmx.rmx_sendpipe / 2); 656 else 657 dosavessthresh = (i < so->so_snd.sb_hiwat / 2); 658 if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 && 659 i != 0 && rt->rt_rmx.rmx_ssthresh != 0) 660 || dosavessthresh) { 661 /* 662 * convert the limit from user data bytes to 663 * packets then to packet data bytes. 664 */ 665 i = (i + tp->t_maxseg / 2) / tp->t_maxseg; 666 if (i < 2) 667 i = 2; 668 i *= (u_long)(tp->t_maxseg + 669#ifdef INET6 670 (isipv6 ? sizeof (struct ip6_hdr) + 671 sizeof (struct tcphdr) : 672#endif 673 sizeof (struct tcpiphdr) 674#ifdef INET6 675 ) 676#endif 677 ); 678 if (rt->rt_rmx.rmx_ssthresh) 679 rt->rt_rmx.rmx_ssthresh = 680 (rt->rt_rmx.rmx_ssthresh + i) / 2; 681 else 682 rt->rt_rmx.rmx_ssthresh = i; 683 tcpstat.tcps_cachedssthresh++; 684 } 685 } 686 no_valid_rt: 687 /* free the reassembly queue, if any */ 688 while((q = LIST_FIRST(&tp->t_segq)) != NULL) { 689 LIST_REMOVE(q, tqe_q); 690 m_freem(q->tqe_m); 691 FREE(q, M_TSEGQ); 692 } 693 if (tp->t_template) 694 (void) m_free(dtom(tp->t_template)); 695 inp->inp_ppcb = NULL; 696 soisdisconnected(so); 697#ifdef INET6 698 if (INP_CHECK_SOCKAF(so, AF_INET6)) 699 in6_pcbdetach(inp); 700 else 701#endif /* INET6 */ 702 in_pcbdetach(inp); 703 tcpstat.tcps_closed++; 704 return ((struct tcpcb *)0); 705} 706 707void 708tcp_drain() 709{ 710 if (do_tcpdrain) 711 { 712 struct inpcb *inpb; 713 struct tcpcb *tcpb; 714 struct tseg_qent *te; 715 716 /* 717 * Walk the tcpbs, if existing, and flush the reassembly queue, 718 * if there is one... 719 * XXX: The "Net/3" implementation doesn't imply that the TCP 720 * reassembly queue should be flushed, but in a situation 721 * where we're really low on mbufs, this is potentially 722 * usefull. 723 */ 724 for (inpb = tcbinfo.listhead->lh_first; inpb; 725 inpb = inpb->inp_list.le_next) { 726 if ((tcpb = intotcpcb(inpb))) { 727 while ((te = LIST_FIRST(&tcpb->t_segq)) 728 != NULL) { 729 LIST_REMOVE(te, tqe_q); 730 m_freem(te->tqe_m); 731 FREE(te, M_TSEGQ); 732 } 733 } 734 } 735 736 } 737} 738 739/* 740 * Notify a tcp user of an asynchronous error; 741 * store error as soft error, but wake up user 742 * (for now, won't do anything until can select for soft error). 743 */ 744static void 745tcp_notify(inp, error) 746 struct inpcb *inp; 747 int error; 748{ 749 register struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb; 750 register struct socket *so = inp->inp_socket; 751 752 /* 753 * Ignore some errors if we are hooked up. 754 * If connection hasn't completed, has retransmitted several times, 755 * and receives a second error, give up now. This is better 756 * than waiting a long time to establish a connection that 757 * can never complete. 758 */ 759 if (tp->t_state == TCPS_ESTABLISHED && 760 (error == EHOSTUNREACH || error == ENETUNREACH || 761 error == EHOSTDOWN)) { 762 return; 763 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 && 764 tp->t_softerror) 765 so->so_error = error; 766 else 767 tp->t_softerror = error; 768 wakeup((caddr_t) &so->so_timeo); 769 sorwakeup(so); 770 sowwakeup(so); 771} 772 773static int 774tcp_pcblist SYSCTL_HANDLER_ARGS 775{ 776 int error, i, n, s; 777 struct inpcb *inp, **inp_list; 778 inp_gen_t gencnt; 779 struct xinpgen xig; 780 781 /* 782 * The process of preparing the TCB list is too time-consuming and 783 * resource-intensive to repeat twice on every request. 784 */ 785 if (req->oldptr == 0) { 786 n = tcbinfo.ipi_count; 787 req->oldidx = 2 * (sizeof xig) 788 + (n + n/8) * sizeof(struct xtcpcb); 789 return 0; 790 } 791 792 if (req->newptr != 0) 793 return EPERM; 794 795 /* 796 * OK, now we're committed to doing something. 797 */ 798 s = splnet(); 799 gencnt = tcbinfo.ipi_gencnt; 800 n = tcbinfo.ipi_count; 801 splx(s); 802 803 xig.xig_len = sizeof xig; 804 xig.xig_count = n; 805 xig.xig_gen = gencnt; 806 xig.xig_sogen = so_gencnt; 807 error = SYSCTL_OUT(req, &xig, sizeof xig); 808 if (error) 809 return error; 810 811 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 812 if (inp_list == 0) 813 return ENOMEM; 814 815 s = splnet(); 816 for (inp = tcbinfo.listhead->lh_first, i = 0; inp && i < n; 817 inp = inp->inp_list.le_next) { 818 if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp)) 819 inp_list[i++] = inp; 820 } 821 splx(s); 822 n = i; 823 824 error = 0; 825 for (i = 0; i < n; i++) { 826 inp = inp_list[i]; 827 if (inp->inp_gencnt <= gencnt) { 828 struct xtcpcb xt; 829 caddr_t inp_ppcb; 830 xt.xt_len = sizeof xt; 831 /* XXX should avoid extra copy */ 832 bcopy(inp, &xt.xt_inp, sizeof *inp); 833 inp_ppcb = inp->inp_ppcb; 834 if (inp_ppcb != NULL) 835 bcopy(inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp); 836 else 837 bzero((char *) &xt.xt_tp, sizeof xt.xt_tp); 838 if (inp->inp_socket) 839 sotoxsocket(inp->inp_socket, &xt.xt_socket); 840 error = SYSCTL_OUT(req, &xt, sizeof xt); 841 } 842 } 843 if (!error) { 844 /* 845 * Give the user an updated idea of our state. 846 * If the generation differs from what we told 847 * her before, she knows that something happened 848 * while we were processing this request, and it 849 * might be necessary to retry. 850 */ 851 s = splnet(); 852 xig.xig_gen = tcbinfo.ipi_gencnt; 853 xig.xig_sogen = so_gencnt; 854 xig.xig_count = tcbinfo.ipi_count; 855 splx(s); 856 error = SYSCTL_OUT(req, &xig, sizeof xig); 857 } 858 free(inp_list, M_TEMP); 859 return error; 860} 861 862SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 863 tcp_pcblist, "S,xtcpcb", "List of active TCP connections"); 864 865static int 866tcp_getcred SYSCTL_HANDLER_ARGS 867{ 868 struct sockaddr_in addrs[2]; 869 struct inpcb *inp; 870 int error, s; 871 872 error = suser(req->p); 873 if (error) 874 return (error); 875 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 876 if (error) 877 return (error); 878 s = splnet(); 879 inp = in_pcblookup_hash(&tcbinfo, addrs[1].sin_addr, addrs[1].sin_port, 880 addrs[0].sin_addr, addrs[0].sin_port, 0, NULL); 881 if (inp == NULL || inp->inp_socket == NULL) { 882 error = ENOENT; 883 goto out; 884 } 885 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); 886out: 887 splx(s); 888 return (error); 889} 890 891SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 892 0, 0, tcp_getcred, "S,ucred", "Get the ucred of a TCP connection"); 893 894#ifdef INET6 895static int 896tcp6_getcred SYSCTL_HANDLER_ARGS 897{ 898 struct sockaddr_in6 addrs[2]; 899 struct inpcb *inp; 900 int error, s, mapped = 0; 901 902 error = suser(req->p); 903 if (error) 904 return (error); 905 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 906 if (error) 907 return (error); 908 if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) { 909 if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr)) 910 mapped = 1; 911 else 912 return (EINVAL); 913 } 914 s = splnet(); 915 if (mapped == 1) 916 inp = in_pcblookup_hash(&tcbinfo, 917 *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12], 918 addrs[1].sin6_port, 919 *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12], 920 addrs[0].sin6_port, 921 0, NULL); 922 else 923 inp = in6_pcblookup_hash(&tcbinfo, &addrs[1].sin6_addr, 924 addrs[1].sin6_port, 925 &addrs[0].sin6_addr, addrs[0].sin6_port, 926 0, NULL); 927 if (inp == NULL || inp->inp_socket == NULL) { 928 error = ENOENT; 929 goto out; 930 } 931 error = SYSCTL_OUT(req, inp->inp_socket->so_cred, 932 sizeof(struct ucred)); 933out: 934 splx(s); 935 return (error); 936} 937 938SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 939 0, 0, 940 tcp6_getcred, "S,ucred", "Get the ucred of a TCP6 connection"); 941#endif 942 943 944void 945tcp_ctlinput(cmd, sa, vip) 946 int cmd; 947 struct sockaddr *sa; 948 void *vip; 949{ 950 register struct ip *ip = vip; 951 register struct tcphdr *th; 952 void (*notify) __P((struct inpcb *, int)) = tcp_notify; 953 954 if (cmd == PRC_QUENCH) 955 notify = tcp_quench; 956 else if (cmd == PRC_MSGSIZE) 957 notify = tcp_mtudisc; 958 else if (!PRC_IS_REDIRECT(cmd) && 959 ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)) 960 return; 961 if (ip) { 962 th = (struct tcphdr *)((caddr_t)ip 963 + (IP_VHL_HL(ip->ip_vhl) << 2)); 964 in_pcbnotify(&tcb, sa, th->th_dport, ip->ip_src, th->th_sport, 965 cmd, notify); 966 } else 967 in_pcbnotify(&tcb, sa, 0, zeroin_addr, 0, cmd, notify); 968} 969 970#ifdef INET6 971void 972tcp6_ctlinput(cmd, sa, d) 973 int cmd; 974 struct sockaddr *sa; 975 void *d; 976{ 977 register struct tcphdr *thp; 978 struct tcphdr th; 979 void (*notify) __P((struct inpcb *, int)) = tcp_notify; 980 struct sockaddr_in6 sa6; 981 struct ip6_hdr *ip6; 982 struct mbuf *m; 983 int off; 984 985 if (sa->sa_family != AF_INET6 || 986 sa->sa_len != sizeof(struct sockaddr_in6)) 987 return; 988 989 if (cmd == PRC_QUENCH) 990 notify = tcp_quench; 991 else if (cmd == PRC_MSGSIZE) 992 notify = tcp_mtudisc; 993 else if (!PRC_IS_REDIRECT(cmd) && 994 ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0)) 995 return; 996 997 /* if the parameter is from icmp6, decode it. */ 998 if (d != NULL) { 999 struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d; 1000 m = ip6cp->ip6c_m; 1001 ip6 = ip6cp->ip6c_ip6; 1002 off = ip6cp->ip6c_off; 1003 } else { 1004 m = NULL; 1005 ip6 = NULL; 1006 } 1007 1008 /* 1009 * Translate addresses into internal form. 1010 * Sa check if it is AF_INET6 is done at the top of this funciton. 1011 */ 1012 sa6 = *(struct sockaddr_in6 *)sa; 1013 if (IN6_IS_ADDR_LINKLOCAL(&sa6.sin6_addr) != 0 && m != NULL && 1014 m->m_pkthdr.rcvif != NULL) 1015 sa6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1016 1017 if (ip6) { 1018 /* 1019 * XXX: We assume that when IPV6 is non NULL, 1020 * M and OFF are valid. 1021 */ 1022 struct in6_addr s; 1023 1024 /* translate addresses into internal form */ 1025 memcpy(&s, &ip6->ip6_src, sizeof(s)); 1026 if (IN6_IS_ADDR_LINKLOCAL(&s) != 0 && m != NULL && 1027 m->m_pkthdr.rcvif != NULL) 1028 s.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1029 1030 if (m->m_len < off + sizeof(*thp)) { 1031 /* 1032 * this should be rare case 1033 * because now MINCLSIZE is "(MHLEN + 1)", 1034 * so we compromise on this copy... 1035 */ 1036 m_copydata(m, off, sizeof(th), (caddr_t)&th); 1037 thp = &th; 1038 } else 1039 thp = (struct tcphdr *)(mtod(m, caddr_t) + off); 1040 in6_pcbnotify(&tcb, (struct sockaddr *)&sa6, thp->th_dport, 1041 &s, thp->th_sport, cmd, notify); 1042 } else 1043 in6_pcbnotify(&tcb, (struct sockaddr *)&sa6, 0, &zeroin6_addr, 1044 0, cmd, notify); 1045} 1046#endif /* INET6 */ 1047 1048/* 1049 * When a source quench is received, close congestion window 1050 * to one segment. We will gradually open it again as we proceed. 1051 */ 1052void 1053tcp_quench(inp, errno) 1054 struct inpcb *inp; 1055 int errno; 1056{ 1057 struct tcpcb *tp = intotcpcb(inp); 1058 1059 if (tp) 1060 tp->snd_cwnd = tp->t_maxseg; 1061} 1062 1063/* 1064 * When `need fragmentation' ICMP is received, update our idea of the MSS 1065 * based on the new value in the route. Also nudge TCP to send something, 1066 * since we know the packet we just sent was dropped. 1067 * This duplicates some code in the tcp_mss() function in tcp_input.c. 1068 */ 1069void 1070tcp_mtudisc(inp, errno) 1071 struct inpcb *inp; 1072 int errno; 1073{ 1074 struct tcpcb *tp = intotcpcb(inp); 1075 struct rtentry *rt; 1076 struct rmxp_tao *taop; 1077 struct socket *so = inp->inp_socket; 1078 int offered; 1079 int mss; 1080#ifdef INET6 1081 int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0; 1082#endif /* INET6 */ 1083 1084 if (tp) { 1085#ifdef INET6 1086 if (isipv6) 1087 rt = tcp_rtlookup6(inp); 1088 else 1089#endif /* INET6 */ 1090 rt = tcp_rtlookup(inp); 1091 if (!rt || !rt->rt_rmx.rmx_mtu) { 1092 tp->t_maxopd = tp->t_maxseg = 1093#ifdef INET6 1094 isipv6 ? tcp_v6mssdflt : 1095#endif /* INET6 */ 1096 tcp_mssdflt; 1097 return; 1098 } 1099 taop = rmx_taop(rt->rt_rmx); 1100 offered = taop->tao_mssopt; 1101 mss = rt->rt_rmx.rmx_mtu - 1102#ifdef INET6 1103 (isipv6 ? 1104 sizeof(struct ip6_hdr) + sizeof(struct tcphdr) : 1105#endif /* INET6 */ 1106 sizeof(struct tcpiphdr) 1107#ifdef INET6 1108 ) 1109#endif /* INET6 */ 1110 ; 1111 1112 if (offered) 1113 mss = min(mss, offered); 1114 /* 1115 * XXX - The above conditional probably violates the TCP 1116 * spec. The problem is that, since we don't know the 1117 * other end's MSS, we are supposed to use a conservative 1118 * default. But, if we do that, then MTU discovery will 1119 * never actually take place, because the conservative 1120 * default is much less than the MTUs typically seen 1121 * on the Internet today. For the moment, we'll sweep 1122 * this under the carpet. 1123 * 1124 * The conservative default might not actually be a problem 1125 * if the only case this occurs is when sending an initial 1126 * SYN with options and data to a host we've never talked 1127 * to before. Then, they will reply with an MSS value which 1128 * will get recorded and the new parameters should get 1129 * recomputed. For Further Study. 1130 */ 1131 if (tp->t_maxopd <= mss) 1132 return; 1133 tp->t_maxopd = mss; 1134 1135 if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && 1136 (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP) 1137 mss -= TCPOLEN_TSTAMP_APPA; 1138 if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC && 1139 (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC) 1140 mss -= TCPOLEN_CC_APPA; 1141#if (MCLBYTES & (MCLBYTES - 1)) == 0 1142 if (mss > MCLBYTES) 1143 mss &= ~(MCLBYTES-1); 1144#else 1145 if (mss > MCLBYTES) 1146 mss = mss / MCLBYTES * MCLBYTES; 1147#endif 1148 if (so->so_snd.sb_hiwat < mss) 1149 mss = so->so_snd.sb_hiwat; 1150 1151 tp->t_maxseg = mss; 1152 1153 tcpstat.tcps_mturesent++; 1154 tp->t_rtttime = 0; 1155 tp->snd_nxt = tp->snd_una; 1156 tcp_output(tp); 1157 } 1158} 1159 1160/* 1161 * Look-up the routing entry to the peer of this inpcb. If no route 1162 * is found and it cannot be allocated the return NULL. This routine 1163 * is called by TCP routines that access the rmx structure and by tcp_mss 1164 * to get the interface MTU. 1165 */ 1166struct rtentry * 1167tcp_rtlookup(inp) 1168 struct inpcb *inp; 1169{ 1170 struct route *ro; 1171 struct rtentry *rt; 1172 1173 ro = &inp->inp_route; 1174 rt = ro->ro_rt; 1175 if (rt == NULL || !(rt->rt_flags & RTF_UP)) { 1176 /* No route yet, so try to acquire one */ 1177 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1178 ro->ro_dst.sa_family = AF_INET; 1179 ro->ro_dst.sa_len = sizeof(ro->ro_dst); 1180 ((struct sockaddr_in *) &ro->ro_dst)->sin_addr = 1181 inp->inp_faddr; 1182 rtalloc(ro); 1183 rt = ro->ro_rt; 1184 } 1185 } 1186 return rt; 1187} 1188 1189#ifdef INET6 1190struct rtentry * 1191tcp_rtlookup6(inp) 1192 struct inpcb *inp; 1193{ 1194 struct route_in6 *ro6; 1195 struct rtentry *rt; 1196 1197 ro6 = &inp->in6p_route; 1198 rt = ro6->ro_rt; 1199 if (rt == NULL || !(rt->rt_flags & RTF_UP)) { 1200 /* No route yet, so try to acquire one */ 1201 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { 1202 ro6->ro_dst.sin6_family = AF_INET6; 1203 ro6->ro_dst.sin6_len = sizeof(ro6->ro_dst); 1204 ro6->ro_dst.sin6_addr = inp->in6p_faddr; 1205 rtalloc((struct route *)ro6); 1206 rt = ro6->ro_rt; 1207 } 1208 } 1209 return rt; 1210} 1211#endif /* INET6 */ 1212 1213#ifdef IPSEC 1214/* compute ESP/AH header size for TCP, including outer IP header. */ 1215size_t 1216ipsec_hdrsiz_tcp(tp) 1217 struct tcpcb *tp; 1218{ 1219 struct inpcb *inp; 1220 struct mbuf *m; 1221 size_t hdrsiz; 1222 struct ip *ip; 1223#ifdef INET6 1224 struct ip6_hdr *ip6; 1225#endif /* INET6 */ 1226 struct tcphdr *th; 1227 1228 if (!tp || !tp->t_template || !(inp = tp->t_inpcb)) 1229 return 0; 1230 MGETHDR(m, M_DONTWAIT, MT_DATA); 1231 if (!m) 1232 return 0; 1233 1234#ifdef INET6 1235 if ((inp->inp_vflag & INP_IPV6) != 0) { 1236 ip6 = mtod(m, struct ip6_hdr *); 1237 th = (struct tcphdr *)(ip6 + 1); 1238 m->m_pkthdr.len = m->m_len = 1239 sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 1240 bcopy((caddr_t)&tp->t_template->tt_ipgen, (caddr_t)ip6, 1241 sizeof(struct ip6_hdr)); 1242 bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, 1243 sizeof(struct tcphdr)); 1244 hdrsiz = ipsec6_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); 1245 } else 1246#endif /* INET6 */ 1247 { 1248 ip = mtod(m, struct ip *); 1249 th = (struct tcphdr *)(ip + 1); 1250 m->m_pkthdr.len = m->m_len = sizeof(struct tcpiphdr); 1251 bcopy((caddr_t)&tp->t_template->tt_ipgen, (caddr_t)ip, 1252 sizeof(struct ip)); 1253 bcopy((caddr_t)&tp->t_template->tt_t, (caddr_t)th, 1254 sizeof(struct tcphdr)); 1255 hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp); 1256 } 1257 1258 m_free(m); 1259 return hdrsiz; 1260} 1261#endif /*IPSEC*/ 1262 1263/* 1264 * Return a pointer to the cached information about the remote host. 1265 * The cached information is stored in the protocol specific part of 1266 * the route metrics. 1267 */ 1268struct rmxp_tao * 1269tcp_gettaocache(inp) 1270 struct inpcb *inp; 1271{ 1272 struct rtentry *rt; 1273 1274#ifdef INET6 1275 if ((inp->inp_vflag & INP_IPV6) != 0) 1276 rt = tcp_rtlookup6(inp); 1277 else 1278#endif /* INET6 */ 1279 rt = tcp_rtlookup(inp); 1280 1281 /* Make sure this is a host route and is up. */ 1282 if (rt == NULL || 1283 (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) 1284 return NULL; 1285 1286 return rmx_taop(rt->rt_rmx); 1287} 1288 1289/* 1290 * Clear all the TAO cache entries, called from tcp_init. 1291 * 1292 * XXX 1293 * This routine is just an empty one, because we assume that the routing 1294 * routing tables are initialized at the same time when TCP, so there is 1295 * nothing in the cache left over. 1296 */ 1297static void 1298tcp_cleartaocache() 1299{ 1300} 1301