tcp_usrreq.c revision 75620
1185377Ssam/* 2187831Ssam * Copyright (c) 1982, 1986, 1988, 1993 3185377Ssam * The Regents of the University of California. All rights reserved. 4185377Ssam * 5185377Ssam * Redistribution and use in source and binary forms, with or without 6185377Ssam * modification, are permitted provided that the following conditions 7185377Ssam * are met: 8185377Ssam * 1. Redistributions of source code must retain the above copyright 9185377Ssam * notice, this list of conditions and the following disclaimer. 10185377Ssam * 2. Redistributions in binary form must reproduce the above copyright 11185377Ssam * notice, this list of conditions and the following disclaimer in the 12185377Ssam * documentation and/or other materials provided with the distribution. 13185377Ssam * 3. All advertising materials mentioning features or use of this software 14185377Ssam * must display the following acknowledgement: 15185377Ssam * This product includes software developed by the University of 16185377Ssam * California, Berkeley and its contributors. 17187831Ssam * 4. Neither the name of the University nor the names of its contributors 18185377Ssam * may be used to endorse or promote products derived from this software 19185377Ssam * without specific prior written permission. 20185377Ssam * 21185377Ssam * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22185377Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23185377Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24185377Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25185377Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26185377Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27185377Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28185377Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29185377Ssam * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30185377Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31185377Ssam * SUCH DAMAGE. 32185377Ssam * 33185377Ssam * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 34220442Sadrian * $FreeBSD: head/sys/netinet/tcp_usrreq.c 75619 2001-04-17 18:08:01Z kris $ 35220442Sadrian */ 36220442Sadrian 37220442Sadrian#include "opt_ipsec.h" 38240623Sadrian#include "opt_inet6.h" 39220442Sadrian#include "opt_tcpdebug.h" 40220442Sadrian 41220442Sadrian#include <sys/param.h> 42185377Ssam#include <sys/systm.h> 43185377Ssam#include <sys/kernel.h> 44185377Ssam#include <sys/sysctl.h> 45185377Ssam#include <sys/mbuf.h> 46185377Ssam#ifdef INET6 47185377Ssam#include <sys/domain.h> 48185377Ssam#endif /* INET6 */ 49185377Ssam#include <sys/socket.h> 50185377Ssam#include <sys/socketvar.h> 51185377Ssam#include <sys/protosw.h> 52185377Ssam#include <sys/proc.h> 53185377Ssam#include <sys/jail.h> 54185377Ssam 55185377Ssam#include <net/if.h> 56185377Ssam#include <net/route.h> 57185377Ssam 58185377Ssam#include <netinet/in.h> 59185377Ssam#include <netinet/in_systm.h> 60185377Ssam#ifdef INET6 61185377Ssam#include <netinet/ip6.h> 62185377Ssam#endif 63185377Ssam#include <netinet/in_pcb.h> 64185377Ssam#ifdef INET6 65185377Ssam#include <netinet6/in6_pcb.h> 66185377Ssam#endif 67185377Ssam#include <netinet/in_var.h> 68185377Ssam#include <netinet/ip_var.h> 69185377Ssam#ifdef INET6 70185377Ssam#include <netinet6/ip6_var.h> 71185377Ssam#endif 72185377Ssam#include <netinet/tcp.h> 73185377Ssam#include <netinet/tcp_fsm.h> 74187831Ssam#include <netinet/tcp_seq.h> 75187831Ssam#include <netinet/tcp_timer.h> 76237874Sadrian#include <netinet/tcp_var.h> 77185377Ssam#include <netinet/tcpip.h> 78185377Ssam#ifdef TCPDEBUG 79185377Ssam#include <netinet/tcp_debug.h> 80185377Ssam#endif 81185377Ssam 82185377Ssam#ifdef IPSEC 83185377Ssam#include <netinet6/ipsec.h> 84185377Ssam#endif /*IPSEC*/ 85185377Ssam 86185377Ssam/* 87185377Ssam * TCP protocol interface to socket abstraction. 88185377Ssam */ 89185377Ssamextern char *tcpstates[]; /* XXX ??? */ 90185377Ssam 91185377Ssamstatic int tcp_attach __P((struct socket *, struct proc *)); 92185377Ssamstatic int tcp_connect __P((struct tcpcb *, struct sockaddr *, 93185377Ssam struct proc *)); 94185377Ssam#ifdef INET6 95185377Ssamstatic int tcp6_connect __P((struct tcpcb *, struct sockaddr *, 96185377Ssam struct proc *)); 97185377Ssam#endif /* INET6 */ 98185377Ssamstatic struct tcpcb * 99185377Ssam tcp_disconnect __P((struct tcpcb *)); 100185377Ssamstatic struct tcpcb * 101185377Ssam tcp_usrclosed __P((struct tcpcb *)); 102185377Ssam 103185377Ssam#ifdef TCPDEBUG 104185377Ssam#define TCPDEBUG0 int ostate = 0 105185377Ssam#define TCPDEBUG1() ostate = tp ? tp->t_state : 0 106185377Ssam#define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ 107185380Ssam tcp_trace(TA_USER, ostate, tp, 0, 0, req) 108185380Ssam#else 109185377Ssam#define TCPDEBUG0 110185377Ssam#define TCPDEBUG1() 111185377Ssam#define TCPDEBUG2(req) 112185377Ssam#endif 113237953Sadrian 114221603Sadrian/* 115221603Sadrian * TCP attaches to socket via pru_attach(), reserving space, 116221603Sadrian * and an internet control block. 117221603Sadrian */ 118221603Sadrianstatic int 119221603Sadriantcp_usr_attach(struct socket *so, int proto, struct proc *p) 120221581Sadrian{ 121221603Sadrian int s = splnet(); 122237953Sadrian int error; 123237953Sadrian struct inpcb *inp = sotoinpcb(so); 124237953Sadrian struct tcpcb *tp = 0; 125221603Sadrian TCPDEBUG0; 126221603Sadrian 127222584Sadrian TCPDEBUG1(); 128222584Sadrian if (inp) { 129222584Sadrian error = EISCONN; 130221603Sadrian goto out; 131221603Sadrian } 132221603Sadrian 133221603Sadrian error = tcp_attach(so, p); 134221603Sadrian if (error) 135221603Sadrian goto out; 136237953Sadrian 137237953Sadrian if ((so->so_options & SO_LINGER) && so->so_linger == 0) 138237953Sadrian so->so_linger = TCP_LINGERTIME; 139221603Sadrian tp = sototcpcb(so); 140247366Sadrianout: 141247366Sadrian TCPDEBUG2(PRU_ATTACH); 142247366Sadrian splx(s); 143221603Sadrian return error; 144237953Sadrian} 145221603Sadrian 146237953Sadrian/* 147237953Sadrian * pru_detach() detaches the TCP protocol from the socket. 148237953Sadrian * If the protocol state is non-embryonic, then can't 149237955Sadrian * do this directly: have to initiate a pru_disconnect(), 150237953Sadrian * which may finish later; embryonic TCB's can just 151237953Sadrian * be discarded here. 152237953Sadrian */ 153237953Sadrianstatic int 154238280Sadriantcp_usr_detach(struct socket *so) 155238280Sadrian{ 156238280Sadrian int s = splnet(); 157238280Sadrian int error = 0; 158238280Sadrian struct inpcb *inp = sotoinpcb(so); 159238280Sadrian struct tcpcb *tp; 160238280Sadrian TCPDEBUG0; 161237953Sadrian 162244854Sadrian if (inp == 0) { 163237953Sadrian splx(s); 164237953Sadrian return EINVAL; /* XXX */ 165237953Sadrian } 166221603Sadrian tp = intotcpcb(inp); 167221603Sadrian TCPDEBUG1(); 168239631Sadrian tp = tcp_disconnect(tp); 169239631Sadrian 170221603Sadrian TCPDEBUG2(PRU_DETACH); 171239631Sadrian splx(s); 172251360Sadrian return error; 173239631Sadrian} 174239631Sadrian 175239631Sadrian#define COMMON_START() TCPDEBUG0; \ 176239631Sadrian do { \ 177239631Sadrian if (inp == 0) { \ 178239631Sadrian splx(s); \ 179239631Sadrian return EINVAL; \ 180239631Sadrian } \ 181222584Sadrian tp = intotcpcb(inp); \ 182239632Sadrian TCPDEBUG1(); \ 183239632Sadrian } while(0) 184239632Sadrian 185239632Sadrian#define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out 186239632Sadrian 187221603Sadrian 188221581Sadrian/* 189221581Sadrian * Give the socket an address. 190221603Sadrian */ 191221603Sadrianstatic int 192221603Sadriantcp_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 193221603Sadrian{ 194221603Sadrian int s = splnet(); 195221603Sadrian int error = 0; 196221603Sadrian struct inpcb *inp = sotoinpcb(so); 197225444Sadrian struct tcpcb *tp; 198226488Sadrian struct sockaddr_in *sinp; 199227410Sadrian 200243743Sadrian COMMON_START(); 201251400Sadrian 202185377Ssam /* 203185377Ssam * Must check for multicast addresses and disallow binding 204185377Ssam * to them. 205185377Ssam */ 206185377Ssam sinp = (struct sockaddr_in *)nam; 207185377Ssam if (sinp->sin_family == AF_INET && 208185377Ssam IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 209185377Ssam error = EAFNOSUPPORT; 210185377Ssam goto out; 211185377Ssam } 212185377Ssam error = in_pcbbind(inp, nam, p); 213185377Ssam if (error) 214185377Ssam goto out; 215185377Ssam COMMON_END(PRU_BIND); 216185377Ssam 217185377Ssam} 218185377Ssam 219185377Ssam#ifdef INET6 220185377Ssamstatic int 221185377Ssamtcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct proc *p) 222185377Ssam{ 223185377Ssam int s = splnet(); 224185377Ssam int error = 0; 225185377Ssam struct inpcb *inp = sotoinpcb(so); 226185377Ssam struct tcpcb *tp; 227185377Ssam struct sockaddr_in6 *sin6p; 228185377Ssam 229185377Ssam COMMON_START(); 230219790Sadrian 231237874Sadrian /* 232237874Sadrian * Must check for multicast addresses and disallow binding 233185377Ssam * to them. 234185377Ssam */ 235185377Ssam sin6p = (struct sockaddr_in6 *)nam; 236185377Ssam if (sin6p->sin6_family == AF_INET6 && 237242407Sadrian IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 238242407Sadrian error = EAFNOSUPPORT; 239242407Sadrian goto out; 240242407Sadrian } 241242407Sadrian inp->inp_vflag &= ~INP_IPV4; 242237874Sadrian inp->inp_vflag |= INP_IPV6; 243237874Sadrian if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0) { 244238280Sadrian 245237874Sadrian if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) 246237874Sadrian inp->inp_vflag |= INP_IPV4; 247237874Sadrian else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 248237874Sadrian struct sockaddr_in sin; 249238857Sadrian 250238857Sadrian in6_sin6_2_sin(&sin, sin6p); 251185377Ssam inp->inp_vflag |= INP_IPV4; 252185377Ssam inp->inp_vflag &= ~INP_IPV6; 253185377Ssam error = in_pcbbind(inp, (struct sockaddr *)&sin, p); 254185377Ssam goto out; 255185377Ssam } 256185377Ssam } 257185377Ssam error = in6_pcbbind(inp, nam, p); 258185377Ssam if (error) 259185377Ssam goto out; 260185377Ssam COMMON_END(PRU_BIND); 261185377Ssam} 262185377Ssam#endif /* INET6 */ 263185377Ssam 264185377Ssam/* 265185377Ssam * Prepare to accept connections. 266185377Ssam */ 267185377Ssamstatic int 268185377Ssamtcp_usr_listen(struct socket *so, struct proc *p) 269185377Ssam{ 270185377Ssam int s = splnet(); 271185377Ssam int error = 0; 272185377Ssam struct inpcb *inp = sotoinpcb(so); 273185377Ssam struct tcpcb *tp; 274185377Ssam 275185377Ssam COMMON_START(); 276185377Ssam if (inp->inp_lport == 0) 277185377Ssam error = in_pcbbind(inp, (struct sockaddr *)0, p); 278185377Ssam if (error == 0) 279185377Ssam tp->t_state = TCPS_LISTEN; 280185377Ssam COMMON_END(PRU_LISTEN); 281185377Ssam} 282185377Ssam 283185377Ssam#ifdef INET6 284185377Ssamstatic int 285185377Ssamtcp6_usr_listen(struct socket *so, struct proc *p) 286185377Ssam{ 287185377Ssam int s = splnet(); 288185377Ssam int error = 0; 289185377Ssam struct inpcb *inp = sotoinpcb(so); 290185377Ssam struct tcpcb *tp; 291185377Ssam 292185377Ssam COMMON_START(); 293185377Ssam if (inp->inp_lport == 0) { 294185377Ssam inp->inp_vflag &= ~INP_IPV4; 295185377Ssam if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0) 296185377Ssam inp->inp_vflag |= INP_IPV4; 297185377Ssam error = in6_pcbbind(inp, (struct sockaddr *)0, p); 298185377Ssam } 299185377Ssam if (error == 0) 300185377Ssam tp->t_state = TCPS_LISTEN; 301185377Ssam COMMON_END(PRU_LISTEN); 302185377Ssam} 303185377Ssam#endif /* INET6 */ 304185377Ssam 305185377Ssam/* 306185377Ssam * Initiate connection to peer. 307185377Ssam * Create a template for use in transmissions on this connection. 308185377Ssam * Enter SYN_SENT state, and mark socket as connecting. 309185377Ssam * Start keep-alive timer, and seed output sequence space. 310185377Ssam * Send initial segment on connection. 311185377Ssam */ 312185377Ssamstatic int 313185377Ssamtcp_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 314185377Ssam{ 315185377Ssam int s = splnet(); 316185377Ssam int error = 0; 317185377Ssam struct inpcb *inp = sotoinpcb(so); 318185377Ssam struct tcpcb *tp; 319185377Ssam struct sockaddr_in *sinp; 320185377Ssam 321185377Ssam COMMON_START(); 322185377Ssam 323185377Ssam /* 324185377Ssam * Must disallow TCP ``connections'' to multicast addresses. 325185377Ssam */ 326185377Ssam sinp = (struct sockaddr_in *)nam; 327185377Ssam if (sinp->sin_family == AF_INET 328185377Ssam && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { 329185377Ssam error = EAFNOSUPPORT; 330185377Ssam goto out; 331185377Ssam } 332185377Ssam 333185377Ssam if (p && jailed(p->p_ucred)) 334185377Ssam prison_remote_ip(p->p_ucred, 0, &sinp->sin_addr.s_addr); 335185377Ssam 336185377Ssam if ((error = tcp_connect(tp, nam, p)) != 0) 337185377Ssam goto out; 338185377Ssam error = tcp_output(tp); 339185377Ssam COMMON_END(PRU_CONNECT); 340185377Ssam} 341185377Ssam 342185377Ssam#ifdef INET6 343185377Ssamstatic int 344185377Ssamtcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct proc *p) 345185377Ssam{ 346185377Ssam int s = splnet(); 347185377Ssam int error = 0; 348185377Ssam struct inpcb *inp = sotoinpcb(so); 349185377Ssam struct tcpcb *tp; 350185377Ssam struct sockaddr_in6 *sin6p; 351185377Ssam 352185377Ssam COMMON_START(); 353185377Ssam 354185377Ssam /* 355185377Ssam * Must disallow TCP ``connections'' to multicast addresses. 356185377Ssam */ 357185377Ssam sin6p = (struct sockaddr_in6 *)nam; 358185377Ssam if (sin6p->sin6_family == AF_INET6 359185377Ssam && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { 360185377Ssam error = EAFNOSUPPORT; 361185377Ssam goto out; 362185377Ssam } 363185377Ssam 364185377Ssam if ((inp->inp_flags & IN6P_BINDV6ONLY) == 0 && 365185377Ssam IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { 366185377Ssam struct sockaddr_in sin; 367185377Ssam 368185377Ssam in6_sin6_2_sin(&sin, sin6p); 369185377Ssam inp->inp_vflag |= INP_IPV4; 370185377Ssam inp->inp_vflag &= ~INP_IPV6; 371185377Ssam if ((error = tcp_connect(tp, (struct sockaddr *)&sin, p)) != 0) 372185377Ssam goto out; 373185377Ssam error = tcp_output(tp); 374185377Ssam goto out; 375185377Ssam } 376185377Ssam inp->inp_vflag &= ~INP_IPV4; 377185377Ssam inp->inp_vflag |= INP_IPV6; 378185377Ssam if ((error = tcp6_connect(tp, nam, p)) != 0) 379185377Ssam goto out; 380185377Ssam error = tcp_output(tp); 381185377Ssam COMMON_END(PRU_CONNECT); 382185377Ssam} 383185377Ssam#endif /* INET6 */ 384185377Ssam 385185377Ssam/* 386185377Ssam * Initiate disconnect from peer. 387185377Ssam * If connection never passed embryonic stage, just drop; 388185377Ssam * else if don't need to let data drain, then can just drop anyways, 389185377Ssam * else have to begin TCP shutdown process: mark socket disconnecting, 390185377Ssam * drain unread data, state switch to reflect user close, and 391185377Ssam * send segment (e.g. FIN) to peer. Socket will be really disconnected 392185377Ssam * when peer sends FIN and acks ours. 393185377Ssam * 394185377Ssam * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. 395220022Sadrian */ 396220022Sadrianstatic int 397220022Sadriantcp_usr_disconnect(struct socket *so) 398220022Sadrian{ 399185377Ssam int s = splnet(); 400185377Ssam int error = 0; 401185377Ssam struct inpcb *inp = sotoinpcb(so); 402185377Ssam struct tcpcb *tp; 403185377Ssam 404185377Ssam COMMON_START(); 405185377Ssam tp = tcp_disconnect(tp); 406220025Sadrian COMMON_END(PRU_DISCONNECT); 407185377Ssam} 408220022Sadrian 409220025Sadrian/* 410220022Sadrian * Accept a connection. Essentially all the work is 411220022Sadrian * done at higher levels; just return the address 412220022Sadrian * of the peer, storing through addr. 413220022Sadrian */ 414220022Sadrianstatic int 415220022Sadriantcp_usr_accept(struct socket *so, struct sockaddr **nam) 416220022Sadrian{ 417220022Sadrian int s = splnet(); 418220022Sadrian int error = 0; 419220022Sadrian struct inpcb *inp = sotoinpcb(so); 420185377Ssam struct tcpcb *tp = NULL; 421185377Ssam TCPDEBUG0; 422185377Ssam 423185377Ssam if (so->so_state & SS_ISDISCONNECTED) { 424185377Ssam error = ECONNABORTED; 425185377Ssam goto out; 426185377Ssam } 427185377Ssam if (inp == 0) { 428185377Ssam splx(s); 429185377Ssam return (EINVAL); 430242407Sadrian } 431242407Sadrian tp = intotcpcb(inp); 432242407Sadrian TCPDEBUG1(); 433242407Sadrian in_setpeeraddr(so, nam); 434242407Sadrian COMMON_END(PRU_ACCEPT); 435242407Sadrian} 436242407Sadrian 437242407Sadrian#ifdef INET6 438242407Sadrianstatic int 439242407Sadriantcp6_usr_accept(struct socket *so, struct sockaddr **nam) 440242407Sadrian{ 441242407Sadrian int s = splnet(); 442242407Sadrian int error = 0; 443242407Sadrian struct inpcb *inp = sotoinpcb(so); 444242407Sadrian struct tcpcb *tp = NULL; 445242407Sadrian TCPDEBUG0; 446242407Sadrian 447185377Ssam if (so->so_state & SS_ISDISCONNECTED) { 448185377Ssam error = ECONNABORTED; 449185377Ssam goto out; 450185377Ssam } 451185377Ssam if (inp == 0) { 452185377Ssam splx(s); 453185377Ssam return (EINVAL); 454185377Ssam } 455185377Ssam tp = intotcpcb(inp); 456185377Ssam TCPDEBUG1(); 457238349Sadrian in6_mapped_peeraddr(so, nam); 458239605Sadrian COMMON_END(PRU_ACCEPT); 459238349Sadrian} 460238349Sadrian#endif /* INET6 */ 461185377Ssam/* 462185377Ssam * Mark the connection as being incapable of further output. 463185377Ssam */ 464185377Ssamstatic int 465185377Ssamtcp_usr_shutdown(struct socket *so) 466208711Srpaulo{ 467239605Sadrian int s = splnet(); 468239605Sadrian int error = 0; 469185377Ssam struct inpcb *inp = sotoinpcb(so); 470185377Ssam struct tcpcb *tp; 471185377Ssam 472185377Ssam COMMON_START(); 473185377Ssam socantsendmore(so); 474239605Sadrian tp = tcp_usrclosed(tp); 475185377Ssam if (tp) 476192401Ssam error = tcp_output(tp); 477185377Ssam COMMON_END(PRU_SHUTDOWN); 478185377Ssam} 479185377Ssam 480185377Ssam/* 481185377Ssam * After a receive, possibly send window update to peer. 482185377Ssam */ 483192400Ssamstatic int 484239605Sadriantcp_usr_rcvd(struct socket *so, int flags) 485242407Sadrian{ 486185377Ssam int s = splnet(); 487185377Ssam int error = 0; 488185377Ssam struct inpcb *inp = sotoinpcb(so); 489185377Ssam struct tcpcb *tp; 490185377Ssam 491185377Ssam COMMON_START(); 492185377Ssam tcp_output(tp); 493192400Ssam COMMON_END(PRU_RCVD); 494192400Ssam} 495185377Ssam 496185377Ssam/* 497185377Ssam * Do a send by putting data in output queue and updating urgent 498185377Ssam * marker if URG set. Possibly send more data. Unlike the other 499185377Ssam * pru_*() routines, the mbuf chains are our responsibility. We 500185377Ssam * must either enqueue them or free them. The other pru_* routines 501192396Ssam * generally are caller-frees. 502185377Ssam */ 503185377Ssamstatic int 504185377Ssamtcp_usr_send(struct socket *so, int flags, struct mbuf *m, 505185377Ssam struct sockaddr *nam, struct mbuf *control, struct proc *p) 506185377Ssam{ 507185377Ssam int s = splnet(); 508239605Sadrian int error = 0; 509192397Ssam struct inpcb *inp = sotoinpcb(so); 510185377Ssam struct tcpcb *tp; 511185377Ssam#ifdef INET6 512185377Ssam int isipv6; 513237622Sadrian#endif 514237622Sadrian TCPDEBUG0; 515237622Sadrian 516185377Ssam if (inp == NULL) { 517237622Sadrian /* 518237622Sadrian * OOPS! we lost a race, the TCP session got reset after 519237622Sadrian * we checked SS_CANTSENDMORE, eg: while doing uiomove or a 520237622Sadrian * network interrupt in the non-splnet() section of sosend(). 521237622Sadrian */ 522237622Sadrian if (m) 523237622Sadrian m_freem(m); 524237622Sadrian if (control) 525237622Sadrian m_freem(control); 526237622Sadrian error = ECONNRESET; /* XXX EPIPE? */ 527237622Sadrian tp = NULL; 528237622Sadrian TCPDEBUG1(); 529237622Sadrian goto out; 530237622Sadrian } 531237622Sadrian#ifdef INET6 532237622Sadrian isipv6 = nam && nam->sa_family == AF_INET6; 533237622Sadrian#endif /* INET6 */ 534237622Sadrian tp = intotcpcb(inp); 535237622Sadrian TCPDEBUG1(); 536237622Sadrian if (control) { 537242407Sadrian /* TCP doesn't do control messages (rights, creds, etc) */ 538242407Sadrian if (control->m_len) { 539242407Sadrian m_freem(control); 540242407Sadrian if (m) 541242407Sadrian m_freem(m); 542242407Sadrian error = EINVAL; 543242407Sadrian goto out; 544242407Sadrian } 545242407Sadrian m_freem(control); /* empty control, just free it */ 546242407Sadrian } 547242407Sadrian if(!(flags & PRUS_OOB)) { 548242407Sadrian sbappend(&so->so_snd, m); 549242407Sadrian if (nam && tp->t_state < TCPS_SYN_SENT) { 550242407Sadrian /* 551242407Sadrian * Do implied connect if not yet connected, 552242407Sadrian * initialize window to default value, and 553242407Sadrian * initialize maxseg/maxopd using peer's cached 554242407Sadrian * MSS. 555242407Sadrian */ 556242407Sadrian#ifdef INET6 557242407Sadrian if (isipv6) 558242407Sadrian error = tcp6_connect(tp, nam, p); 559242407Sadrian else 560242407Sadrian#endif /* INET6 */ 561242407Sadrian error = tcp_connect(tp, nam, p); 562242407Sadrian if (error) 563242407Sadrian goto out; 564237622Sadrian tp->snd_wnd = TTCP_CLIENT_SND_WND; 565237611Sadrian tcp_mss(tp, -1); 566237611Sadrian } 567237611Sadrian 568237611Sadrian if (flags & PRUS_EOF) { 569237611Sadrian /* 570237611Sadrian * Close the send side of the connection after 571249131Sadrian * the data is sent. 572249131Sadrian */ 573249131Sadrian socantsendmore(so); 574249131Sadrian tp = tcp_usrclosed(tp); 575249131Sadrian } 576249131Sadrian if (tp != NULL) { 577249131Sadrian if (flags & PRUS_MORETOCOME) 578249131Sadrian tp->t_flags |= TF_MORETOCOME; 579249131Sadrian error = tcp_output(tp); 580249131Sadrian if (flags & PRUS_MORETOCOME) 581249131Sadrian tp->t_flags &= ~TF_MORETOCOME; 582249131Sadrian } 583249131Sadrian } else { 584249131Sadrian if (sbspace(&so->so_snd) < -512) { 585249131Sadrian m_freem(m); 586249131Sadrian error = ENOBUFS; 587188974Ssam goto out; 588188974Ssam } 589188974Ssam /* 590188974Ssam * According to RFC961 (Assigned Protocols), 591188974Ssam * the urgent pointer points to the last octet 592188974Ssam * of urgent data. We continue, however, 593188974Ssam * to consider it to indicate the first octet 594188974Ssam * of data past the urgent section. 595242509Sadrian * Otherwise, snd_up should be one lower. 596242509Sadrian */ 597242509Sadrian sbappend(&so->so_snd, m); 598242509Sadrian if (nam && tp->t_state < TCPS_SYN_SENT) { 599242509Sadrian /* 600242509Sadrian * Do implied connect if not yet connected, 601242509Sadrian * initialize window to default value, and 602242509Sadrian * initialize maxseg/maxopd using peer's cached 603242509Sadrian * MSS. 604188974Ssam */ 605185377Ssam#ifdef INET6 606185377Ssam if (isipv6) 607185377Ssam error = tcp6_connect(tp, nam, p); 608185377Ssam else 609185377Ssam#endif /* INET6 */ 610187831Ssam error = tcp_connect(tp, nam, p); 611187831Ssam if (error) 612185377Ssam goto out; 613185377Ssam tp->snd_wnd = TTCP_CLIENT_SND_WND; 614185377Ssam tcp_mss(tp, -1); 615185377Ssam } 616185377Ssam tp->snd_up = tp->snd_una + so->so_snd.sb_cc; 617185377Ssam tp->t_force = 1; 618185377Ssam error = tcp_output(tp); 619185377Ssam tp->t_force = 0; 620185377Ssam } 621185377Ssam COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : 622185377Ssam ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); 623185377Ssam} 624185377Ssam 625185377Ssam/* 626242407Sadrian * Abort the TCP. 627242407Sadrian */ 628242407Sadrianstatic int 629242407Sadriantcp_usr_abort(struct socket *so) 630242407Sadrian{ 631242407Sadrian int s = splnet(); 632242407Sadrian int error = 0; 633242407Sadrian struct inpcb *inp = sotoinpcb(so); 634242407Sadrian struct tcpcb *tp; 635242407Sadrian 636242407Sadrian COMMON_START(); 637185377Ssam tp = tcp_drop(tp, ECONNABORTED); 638185377Ssam COMMON_END(PRU_ABORT); 639185377Ssam} 640185377Ssam 641185377Ssam/* 642185377Ssam * Receive out-of-band data. 643185377Ssam */ 644185377Ssamstatic int 645185377Ssamtcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) 646185377Ssam{ 647185377Ssam int s = splnet(); 648185377Ssam int error = 0; 649185380Ssam struct inpcb *inp = sotoinpcb(so); 650185380Ssam struct tcpcb *tp; 651185380Ssam 652185380Ssam COMMON_START(); 653185377Ssam if ((so->so_oobmark == 0 && 654185377Ssam (so->so_state & SS_RCVATMARK) == 0) || 655185377Ssam so->so_options & SO_OOBINLINE || 656185377Ssam tp->t_oobflags & TCPOOB_HADDATA) { 657185377Ssam error = EINVAL; 658185377Ssam goto out; 659185377Ssam } 660185377Ssam if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { 661185377Ssam error = EWOULDBLOCK; 662185377Ssam goto out; 663185377Ssam } 664239289Sadrian m->m_len = 1; 665185377Ssam *mtod(m, caddr_t) = tp->t_iobc; 666188770Ssam if ((flags & MSG_PEEK) == 0) 667188770Ssam tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); 668185377Ssam COMMON_END(PRU_RCVOOB); 669185377Ssam} 670185377Ssam 671185377Ssam/* xxx - should be const */ 672185377Ssamstruct pr_usrreqs tcp_usrreqs = { 673185377Ssam tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, 674185377Ssam tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach, 675185377Ssam tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd, 676185377Ssam tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 677185377Ssam in_setsockaddr, sosend, soreceive, sopoll 678239289Sadrian}; 679185377Ssam 680185377Ssam#ifdef INET6 681185377Ssamstruct pr_usrreqs tcp6_usrreqs = { 682185377Ssam tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind, 683239289Sadrian tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach, 684185377Ssam tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd, 685185377Ssam tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, 686185377Ssam in6_mapped_sockaddr, sosend, soreceive, sopoll 687185377Ssam}; 688185377Ssam#endif /* INET6 */ 689185377Ssam 690185377Ssam/* 691185377Ssam * Common subroutine to open a TCP connection to remote host specified 692185377Ssam * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local 693185377Ssam * port number if needed. Call in_pcbladdr to do the routing and to choose 694185377Ssam * a local host address (interface). If there is an existing incarnation 695185377Ssam * of the same connection in TIME-WAIT state and if the remote host was 696238840Sadrian * sending CC options and if the connection duration was < MSL, then 697238840Sadrian * truncate the previous TIME-WAIT state and proceed. 698185377Ssam * Initialize connection parameters and enter SYN-SENT state. 699185377Ssam */ 700185377Ssamstatic int 701185377Ssamtcp_connect(tp, nam, p) 702185377Ssam register struct tcpcb *tp; 703185377Ssam struct sockaddr *nam; 704238841Sadrian struct proc *p; 705242407Sadrian{ 706185377Ssam struct inpcb *inp = tp->t_inpcb, *oinp; 707185377Ssam struct socket *so = inp->inp_socket; 708185377Ssam struct tcpcb *otp; 709185377Ssam struct sockaddr_in *sin = (struct sockaddr_in *)nam; 710185377Ssam struct sockaddr_in *ifaddr; 711185377Ssam struct rmxp_tao *taop; 712185377Ssam struct rmxp_tao tao_noncached; 713185377Ssam int error; 714185377Ssam 715185377Ssam if (inp->inp_lport == 0) { 716185377Ssam error = in_pcbbind(inp, (struct sockaddr *)0, p); 717185377Ssam if (error) 718185377Ssam return error; 719185377Ssam } 720185377Ssam 721185377Ssam /* 722185377Ssam * Cannot simply call in_pcbconnect, because there might be an 723185377Ssam * earlier incarnation of this same connection still in 724185377Ssam * TIME_WAIT state, creating an ADDRINUSE error. 725185377Ssam */ 726185377Ssam error = in_pcbladdr(inp, nam, &ifaddr); 727185377Ssam if (error) 728185377Ssam return error; 729242407Sadrian oinp = in_pcblookup_hash(inp->inp_pcbinfo, 730242407Sadrian sin->sin_addr, sin->sin_port, 731242407Sadrian inp->inp_laddr.s_addr != INADDR_ANY ? inp->inp_laddr 732242407Sadrian : ifaddr->sin_addr, 733242407Sadrian inp->inp_lport, 0, NULL); 734185377Ssam if (oinp) { 735185377Ssam if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 736185377Ssam otp->t_state == TCPS_TIME_WAIT && 737185377Ssam (ticks - otp->t_starttime) < tcp_msl && 738185377Ssam (otp->t_flags & TF_RCVD_CC)) 739185377Ssam otp = tcp_close(otp); 740185377Ssam else 741185377Ssam return EADDRINUSE; 742185377Ssam } 743185377Ssam if (inp->inp_laddr.s_addr == INADDR_ANY) 744185377Ssam inp->inp_laddr = ifaddr->sin_addr; 745185377Ssam inp->inp_faddr = sin->sin_addr; 746185377Ssam inp->inp_fport = sin->sin_port; 747185377Ssam in_pcbrehash(inp); 748185377Ssam 749185377Ssam tp->t_template = tcp_template(tp); 750185377Ssam if (tp->t_template == 0) { 751185377Ssam in_pcbdisconnect(inp); 752185377Ssam return ENOBUFS; 753185377Ssam } 754185377Ssam 755237874Sadrian /* Compute window scaling to request. */ 756185377Ssam while (tp->request_r_scale < TCP_MAX_WINSHIFT && 757185377Ssam (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 758185377Ssam tp->request_r_scale++; 759185377Ssam 760185377Ssam soisconnecting(so); 761185377Ssam tcpstat.tcps_connattempt++; 762242407Sadrian tp->t_state = TCPS_SYN_SENT; 763242407Sadrian callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 764242407Sadrian#ifdef TCP_COMPAT_42 765242407Sadrian tp->iss = tcp_iss; 766242407Sadrian tcp_iss += TCP_ISSINCR/2; 767185377Ssam#else /* TCP_COMPAT_42 */ 768242407Sadrian tp->iss = tcp_rndiss_next(); 769242407Sadrian#endif /* !TCP_COMPAT_42 */ 770242407Sadrian tcp_sendseqinit(tp); 771242407Sadrian 772242407Sadrian /* 773242407Sadrian * Generate a CC value for this connection and 774242407Sadrian * check whether CC or CCnew should be used. 775185377Ssam */ 776185377Ssam if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) { 777185377Ssam taop = &tao_noncached; 778185377Ssam bzero(taop, sizeof(*taop)); 779185377Ssam } 780185377Ssam 781185377Ssam tp->cc_send = CC_INC(tcp_ccgen); 782185377Ssam if (taop->tao_ccsent != 0 && 783185377Ssam CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 784185377Ssam taop->tao_ccsent = tp->cc_send; 785185377Ssam } else { 786185377Ssam taop->tao_ccsent = 0; 787185377Ssam tp->t_flags |= TF_SENDCCNEW; 788185377Ssam } 789185377Ssam 790185377Ssam return 0; 791185377Ssam} 792185377Ssam 793185377Ssam#ifdef INET6 794185377Ssamstatic int 795185377Ssamtcp6_connect(tp, nam, p) 796185377Ssam register struct tcpcb *tp; 797185377Ssam struct sockaddr *nam; 798185377Ssam struct proc *p; 799185377Ssam{ 800185377Ssam struct inpcb *inp = tp->t_inpcb, *oinp; 801185377Ssam struct socket *so = inp->inp_socket; 802243589Sadrian struct tcpcb *otp; 803243589Sadrian struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 804243589Sadrian struct in6_addr *addr6; 805243589Sadrian struct rmxp_tao *taop; 806243589Sadrian struct rmxp_tao tao_noncached; 807185377Ssam int error; 808242407Sadrian 809185377Ssam if (inp->inp_lport == 0) { 810185377Ssam error = in6_pcbbind(inp, (struct sockaddr *)0, p); 811242407Sadrian if (error) 812185377Ssam return error; 813185377Ssam } 814185377Ssam 815185377Ssam /* 816185377Ssam * Cannot simply call in_pcbconnect, because there might be an 817185377Ssam * earlier incarnation of this same connection still in 818185377Ssam * TIME_WAIT state, creating an ADDRINUSE error. 819242407Sadrian */ 820185377Ssam error = in6_pcbladdr(inp, nam, &addr6); 821185377Ssam if (error) 822185377Ssam return error; 823185377Ssam oinp = in6_pcblookup_hash(inp->inp_pcbinfo, 824185377Ssam &sin6->sin6_addr, sin6->sin6_port, 825185377Ssam IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 826185377Ssam ? addr6 827185377Ssam : &inp->in6p_laddr, 828185377Ssam inp->inp_lport, 0, NULL); 829185377Ssam if (oinp) { 830185377Ssam if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && 831185377Ssam otp->t_state == TCPS_TIME_WAIT && 832185377Ssam (ticks - otp->t_starttime) < tcp_msl && 833185377Ssam (otp->t_flags & TF_RCVD_CC)) 834185377Ssam otp = tcp_close(otp); 835185377Ssam else 836185377Ssam return EADDRINUSE; 837185377Ssam } 838185377Ssam if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 839185377Ssam inp->in6p_laddr = *addr6; 840185377Ssam inp->in6p_faddr = sin6->sin6_addr; 841185377Ssam inp->inp_fport = sin6->sin6_port; 842185377Ssam if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL) 843185377Ssam inp->in6p_flowinfo = sin6->sin6_flowinfo; 844185377Ssam in_pcbrehash(inp); 845185377Ssam 846185377Ssam tp->t_template = tcp_template(tp); 847185377Ssam if (tp->t_template == 0) { 848185377Ssam in6_pcbdisconnect(inp); 849185377Ssam return ENOBUFS; 850242407Sadrian } 851185377Ssam 852185377Ssam /* Compute window scaling to request. */ 853185377Ssam while (tp->request_r_scale < TCP_MAX_WINSHIFT && 854187831Ssam (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) 855185377Ssam tp->request_r_scale++; 856185377Ssam 857219773Sadrian soisconnecting(so); 858219773Sadrian tcpstat.tcps_connattempt++; 859219773Sadrian tp->t_state = TCPS_SYN_SENT; 860219773Sadrian callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); 861219773Sadrian#ifdef TCP_COMPAT_42 862219773Sadrian tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2; 863219773Sadrian#else 864219773Sadrian tp->iss = tcp_rndiss_next(); 865219773Sadrian#endif /* TCP_COMPAT_42 */ 866219773Sadrian tcp_sendseqinit(tp); 867219773Sadrian 868234749Sadrian /* 869219773Sadrian * Generate a CC value for this connection and 870234749Sadrian * check whether CC or CCnew should be used. 871234749Sadrian */ 872234749Sadrian if ((taop = tcp_gettaocache(tp->t_inpcb)) == NULL) { 873219773Sadrian taop = &tao_noncached; 874219773Sadrian bzero(taop, sizeof(*taop)); 875219773Sadrian } 876219773Sadrian 877219773Sadrian tp->cc_send = CC_INC(tcp_ccgen); 878219773Sadrian if (taop->tao_ccsent != 0 && 879219773Sadrian CC_GEQ(tp->cc_send, taop->tao_ccsent)) { 880219773Sadrian taop->tao_ccsent = tp->cc_send; 881219773Sadrian } else { 882219773Sadrian taop->tao_ccsent = 0; 883219773Sadrian tp->t_flags |= TF_SENDCCNEW; 884219773Sadrian } 885219773Sadrian 886219773Sadrian return 0; 887219773Sadrian} 888222277Sadrian#endif /* INET6 */ 889222277Sadrian 890222277Sadrian/* 891222277Sadrian * The new sockopt interface makes it possible for us to block in the 892222277Sadrian * copyin/out step (if we take a page fault). Taking a page fault at 893222277Sadrian * splnet() is probably a Bad Thing. (Since sockets and pcbs both now 894222277Sadrian * use TSM, there probably isn't any need for this function to run at 895222277Sadrian * splnet() any more. This needs more examination.) 896222277Sadrian */ 897222277Sadrianint 898222277Sadriantcp_ctloutput(so, sopt) 899222277Sadrian struct socket *so; 900222277Sadrian struct sockopt *sopt; 901222277Sadrian{ 902222277Sadrian int error, opt, optval, s; 903222277Sadrian struct inpcb *inp; 904222277Sadrian struct tcpcb *tp; 905237874Sadrian 906222277Sadrian error = 0; 907222277Sadrian s = splnet(); /* XXX */ 908242407Sadrian inp = sotoinpcb(so); 909242407Sadrian if (inp == NULL) { 910222277Sadrian splx(s); 911222277Sadrian return (ECONNRESET); 912222277Sadrian } 913222277Sadrian if (sopt->sopt_level != IPPROTO_TCP) { 914222277Sadrian#ifdef INET6 915222277Sadrian if (INP_CHECK_SOCKAF(so, AF_INET6)) 916222277Sadrian error = ip6_ctloutput(so, sopt); 917222277Sadrian else 918222277Sadrian#endif /* INET6 */ 919222277Sadrian error = ip_ctloutput(so, sopt); 920222277Sadrian splx(s); 921222277Sadrian return (error); 922222277Sadrian } 923222277Sadrian tp = intotcpcb(inp); 924222277Sadrian 925222584Sadrian switch (sopt->sopt_dir) { 926222584Sadrian case SOPT_SET: 927222584Sadrian switch (sopt->sopt_name) { 928222584Sadrian case TCP_NODELAY: 929222584Sadrian case TCP_NOOPT: 930222584Sadrian error = sooptcopyin(sopt, &optval, sizeof optval, 931222584Sadrian sizeof optval); 932222584Sadrian if (error) 933222584Sadrian break; 934222584Sadrian 935222584Sadrian switch (sopt->sopt_name) { 936224244Sadrian case TCP_NODELAY: 937224244Sadrian opt = TF_NODELAY; 938222584Sadrian break; 939222584Sadrian case TCP_NOOPT: 940222584Sadrian opt = TF_NOOPT; 941222584Sadrian break; 942224244Sadrian default: 943222584Sadrian opt = 0; /* dead code to fool gcc */ 944222584Sadrian break; 945222584Sadrian } 946224244Sadrian 947224244Sadrian if (optval) 948231708Sadrian tp->t_flags |= opt; 949231708Sadrian else 950222584Sadrian tp->t_flags &= ~opt; 951222584Sadrian break; 952222584Sadrian 953222584Sadrian case TCP_NOPUSH: 954244854Sadrian error = sooptcopyin(sopt, &optval, sizeof optval, 955244854Sadrian sizeof optval); 956244854Sadrian if (error) 957244854Sadrian break; 958244854Sadrian 959244854Sadrian if (optval) 960244854Sadrian tp->t_flags |= TF_NOPUSH; 961244854Sadrian else { 962244854Sadrian tp->t_flags &= ~TF_NOPUSH; 963244854Sadrian error = tcp_output(tp); 964245281Sadrian } 965245281Sadrian break; 966244854Sadrian 967244854Sadrian case TCP_MAXSEG: 968244854Sadrian error = sooptcopyin(sopt, &optval, sizeof optval, 969244854Sadrian sizeof optval); 970224716Sadrian if (error) 971224716Sadrian break; 972224716Sadrian 973224716Sadrian if (optval > 0 && optval <= tp->t_maxseg) 974224716Sadrian tp->t_maxseg = optval; 975224716Sadrian else 976224716Sadrian error = EINVAL; 977224716Sadrian break; 978224716Sadrian 979222584Sadrian default: 980242407Sadrian error = ENOPROTOOPT; 981222277Sadrian break; 982239606Sadrian } 983239606Sadrian break; 984239606Sadrian 985239606Sadrian case SOPT_GET: 986239606Sadrian switch (sopt->sopt_name) { 987239606Sadrian case TCP_NODELAY: 988239606Sadrian optval = tp->t_flags & TF_NODELAY; 989239606Sadrian break; 990239890Sadrian case TCP_MAXSEG: 991239890Sadrian optval = tp->t_maxseg; 992239890Sadrian break; 993239890Sadrian case TCP_NOOPT: 994239890Sadrian optval = tp->t_flags & TF_NOOPT; 995239890Sadrian break; 996239890Sadrian case TCP_NOPUSH: 997239890Sadrian optval = tp->t_flags & TF_NOPUSH; 998239890Sadrian break; 999239890Sadrian default: 1000239890Sadrian error = ENOPROTOOPT; 1001239890Sadrian break; 1002239890Sadrian } 1003239890Sadrian if (error == 0) 1004239890Sadrian error = sooptcopyout(sopt, &optval, sizeof optval); 1005239890Sadrian break; 1006239890Sadrian } 1007239890Sadrian splx(s); 1008239890Sadrian return (error); 1009239890Sadrian} 1010239890Sadrian 1011239890Sadrian/* 1012239890Sadrian * tcp_sendspace and tcp_recvspace are the default send and receive window 1013239606Sadrian * sizes, respectively. These are obsolescent (this information should 1014222644Sadrian * be set by the route). 1015222644Sadrian */ 1016222644Sadrianu_long tcp_sendspace = 1024*16; 1017222644SadrianSYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, 1018222644Sadrian &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); 1019222644Sadrianu_long tcp_recvspace = 1024*16; 1020222644SadrianSYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, 1021222644Sadrian &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); 1022222644Sadrian 1023222815Sadrian/* 1024224539Sadrian * Attach TCP protocol to socket, allocating 1025224539Sadrian * internet protocol control block, tcp control block, 1026224539Sadrian * bufer space, and entering LISTEN state if to accept connections. 1027222815Sadrian */ 1028224633Sadrianstatic int 1029222815Sadriantcp_attach(so, p) 1030222815Sadrian struct socket *so; 1031222815Sadrian struct proc *p; 1032222815Sadrian{ 1033222815Sadrian register struct tcpcb *tp; 1034222815Sadrian struct inpcb *inp; 1035224633Sadrian int error; 1036222815Sadrian#ifdef INET6 1037237611Sadrian int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL; 1038242407Sadrian#endif 1039242407Sadrian 1040242407Sadrian if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 1041242407Sadrian error = soreserve(so, tcp_sendspace, tcp_recvspace); 1042242407Sadrian if (error) 1043242407Sadrian return (error); 1044242407Sadrian } 1045242407Sadrian error = in_pcballoc(so, &tcbinfo, p); 1046242407Sadrian if (error) 1047242407Sadrian return (error); 1048242407Sadrian inp = sotoinpcb(so); 1049242407Sadrian#ifdef IPSEC 1050242407Sadrian error = ipsec_init_policy(so, &inp->inp_sp); 1051242407Sadrian if (error) { 1052237611Sadrian#ifdef INET6 1053237611Sadrian if (isipv6) 1054237611Sadrian in6_pcbdetach(inp); 1055237611Sadrian else 1056237611Sadrian#endif 1057237611Sadrian in_pcbdetach(inp); 1058237611Sadrian return (error); 1059237611Sadrian } 1060237611Sadrian#endif /*IPSEC*/ 1061237611Sadrian#ifdef INET6 1062237611Sadrian if (isipv6) { 1063237611Sadrian inp->inp_vflag |= INP_IPV6; 1064237611Sadrian inp->in6p_hops = -1; /* use kernel default */ 1065237611Sadrian } 1066237611Sadrian else 1067237611Sadrian#endif 1068237611Sadrian inp->inp_vflag |= INP_IPV4; 1069237611Sadrian tp = tcp_newtcpcb(inp); 1070237611Sadrian if (tp == 0) { 1071237611Sadrian int nofd = so->so_state & SS_NOFDREF; /* XXX */ 1072237611Sadrian 1073237611Sadrian so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ 1074237611Sadrian#ifdef INET6 1075237611Sadrian if (isipv6) 1076237611Sadrian in6_pcbdetach(inp); 1077237611Sadrian else 1078237611Sadrian#endif 1079237611Sadrian in_pcbdetach(inp); 1080237611Sadrian so->so_state |= nofd; 1081237611Sadrian return (ENOBUFS); 1082237611Sadrian } 1083237611Sadrian tp->t_state = TCPS_CLOSED; 1084237611Sadrian return (0); 1085237611Sadrian} 1086237611Sadrian 1087237611Sadrian/* 1088237611Sadrian * Initiate (or continue) disconnect. 1089237611Sadrian * If embryonic state, just send reset (once). 1090237611Sadrian * If in ``let data drain'' option and linger null, just drop. 1091237611Sadrian * Otherwise (hard), mark socket disconnecting and drop 1092237611Sadrian * current input data; switch states based on user close, and 1093237611Sadrian * send segment to peer (with FIN). 1094249131Sadrian */ 1095249131Sadrianstatic struct tcpcb * 1096237611Sadriantcp_disconnect(tp) 1097237611Sadrian register struct tcpcb *tp; 1098237611Sadrian{ 1099237611Sadrian struct socket *so = tp->t_inpcb->inp_socket; 1100237611Sadrian 1101237611Sadrian if (tp->t_state < TCPS_ESTABLISHED) 1102237611Sadrian tp = tcp_close(tp); 1103237611Sadrian else if ((so->so_options & SO_LINGER) && so->so_linger == 0) 1104237611Sadrian tp = tcp_drop(tp, 0); 1105237611Sadrian else { 1106237611Sadrian soisdisconnecting(so); 1107237611Sadrian sbflush(&so->so_rcv); 1108237611Sadrian tp = tcp_usrclosed(tp); 1109237611Sadrian if (tp) 1110237611Sadrian (void) tcp_output(tp); 1111237611Sadrian } 1112237611Sadrian return (tp); 1113237611Sadrian} 1114237611Sadrian 1115237611Sadrian/* 1116237611Sadrian * User issued close, and wish to trail through shutdown states: 1117237611Sadrian * if never received SYN, just forget it. If got a SYN from peer, 1118237611Sadrian * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. 1119237611Sadrian * If already got a FIN from peer, then almost done; go to LAST_ACK 1120237611Sadrian * state. In all other cases, have already sent FIN to peer (e.g. 1121237611Sadrian * after PRU_SHUTDOWN), and just have to play tedious game waiting 1122237611Sadrian * for peer to send FIN or not respond to keep-alives, etc. 1123237611Sadrian * We can let the user exit from the close as soon as the FIN is acked. 1124237611Sadrian */ 1125237611Sadrianstatic struct tcpcb * 1126237611Sadriantcp_usrclosed(tp) 1127237611Sadrian register struct tcpcb *tp; 1128237611Sadrian{ 1129237611Sadrian 1130237611Sadrian switch (tp->t_state) { 1131237611Sadrian 1132237611Sadrian case TCPS_CLOSED: 1133237611Sadrian case TCPS_LISTEN: 1134237611Sadrian tp->t_state = TCPS_CLOSED; 1135237611Sadrian tp = tcp_close(tp); 1136237611Sadrian break; 1137237611Sadrian 1138237611Sadrian case TCPS_SYN_SENT: 1139237611Sadrian case TCPS_SYN_RECEIVED: 1140237611Sadrian tp->t_flags |= TF_NEEDFIN; 1141237611Sadrian break; 1142237611Sadrian 1143237611Sadrian case TCPS_ESTABLISHED: 1144237611Sadrian tp->t_state = TCPS_FIN_WAIT_1; 1145237611Sadrian break; 1146237611Sadrian 1147237611Sadrian case TCPS_CLOSE_WAIT: 1148237611Sadrian tp->t_state = TCPS_LAST_ACK; 1149237611Sadrian break; 1150237611Sadrian } 1151237611Sadrian if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { 1152237611Sadrian soisdisconnected(tp->t_inpcb->inp_socket); 1153237611Sadrian /* To prevent the connection hanging in FIN_WAIT_2 forever. */ 1154237611Sadrian if (tp->t_state == TCPS_FIN_WAIT_2) 1155237611Sadrian callout_reset(tp->tt_2msl, tcp_maxidle, 1156237611Sadrian tcp_timer_2msl, tp); 1157237611Sadrian } 1158237611Sadrian return (tp); 1159237611Sadrian} 1160237611Sadrian 1161237611Sadrian