| 1 | /* |
| 2 | * Copyright (c) 2003-2004 Jeffrey M. Hsu. All rights reserved. |
| 3 | * Copyright (c) 1982, 1986, 1988, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. All advertising materials mentioning features or use of this software |
| 15 | * must display the following acknowledgement: |
| 16 | * This product includes software developed by the University of |
| 17 | * California, Berkeley and its contributors. |
| 18 | * 4. Neither the name of the University nor the names of its contributors |
| 19 | * may be used to endorse or promote products derived from this software |
| 20 | * without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * From: @(#)tcp_usrreq.c 8.2 (Berkeley) 1/3/94 |
| 35 | * $FreeBSD: src/sys/netinet/tcp_usrreq.c,v 1.51.2.17 2002/10/11 11:46:44 ume Exp $ |
| 36 | * $DragonFly: src/sys/netinet/tcp_usrreq.c,v 1.24 2004/07/02 04:41:01 hsu Exp $ |
| 37 | */ |
| 38 | |
| 39 | #include "opt_ipsec.h" |
| 40 | #include "opt_inet6.h" |
| 41 | #include "opt_tcpdebug.h" |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/kernel.h> |
| 46 | #include <sys/malloc.h> |
| 47 | #include <sys/sysctl.h> |
| 48 | #include <sys/globaldata.h> |
| 49 | #include <sys/thread.h> |
| 50 | |
| 51 | #include <sys/mbuf.h> |
| 52 | #ifdef INET6 |
| 53 | #include <sys/domain.h> |
| 54 | #endif /* INET6 */ |
| 55 | #include <sys/socket.h> |
| 56 | #include <sys/socketvar.h> |
| 57 | #include <sys/protosw.h> |
| 58 | |
| 59 | #include <sys/msgport2.h> |
| 60 | |
| 61 | #include <net/if.h> |
| 62 | #include <net/netisr.h> |
| 63 | #include <net/route.h> |
| 64 | |
| 65 | #include <netinet/in.h> |
| 66 | #include <netinet/in_systm.h> |
| 67 | #ifdef INET6 |
| 68 | #include <netinet/ip6.h> |
| 69 | #endif |
| 70 | #include <netinet/in_pcb.h> |
| 71 | #ifdef INET6 |
| 72 | #include <netinet6/in6_pcb.h> |
| 73 | #endif |
| 74 | #include <netinet/in_var.h> |
| 75 | #include <netinet/ip_var.h> |
| 76 | #ifdef INET6 |
| 77 | #include <netinet6/ip6_var.h> |
| 78 | #endif |
| 79 | #include <netinet/tcp.h> |
| 80 | #include <netinet/tcp_fsm.h> |
| 81 | #include <netinet/tcp_seq.h> |
| 82 | #include <netinet/tcp_timer.h> |
| 83 | #include <netinet/tcp_var.h> |
| 84 | #include <netinet/tcpip.h> |
| 85 | #ifdef TCPDEBUG |
| 86 | #include <netinet/tcp_debug.h> |
| 87 | #endif |
| 88 | |
| 89 | #ifdef IPSEC |
| 90 | #include <netinet6/ipsec.h> |
| 91 | #endif /*IPSEC*/ |
| 92 | |
| 93 | /* |
| 94 | * TCP protocol interface to socket abstraction. |
| 95 | */ |
| 96 | extern char *tcpstates[]; /* XXX ??? */ |
| 97 | |
| 98 | static int tcp_attach (struct socket *, struct pru_attach_info *); |
| 99 | static int tcp_connect (struct tcpcb *, struct sockaddr *, |
| 100 | struct thread *); |
| 101 | #ifdef INET6 |
| 102 | static int tcp6_connect (struct tcpcb *, struct sockaddr *, |
| 103 | struct thread *); |
| 104 | #endif /* INET6 */ |
| 105 | static struct tcpcb * |
| 106 | tcp_disconnect (struct tcpcb *); |
| 107 | static struct tcpcb * |
| 108 | tcp_usrclosed (struct tcpcb *); |
| 109 | |
| 110 | #ifdef TCPDEBUG |
| 111 | #define TCPDEBUG0 int ostate = 0 |
| 112 | #define TCPDEBUG1() ostate = tp ? tp->t_state : 0 |
| 113 | #define TCPDEBUG2(req) if (tp && (so->so_options & SO_DEBUG)) \ |
| 114 | tcp_trace(TA_USER, ostate, tp, 0, 0, req) |
| 115 | #else |
| 116 | #define TCPDEBUG0 |
| 117 | #define TCPDEBUG1() |
| 118 | #define TCPDEBUG2(req) |
| 119 | #endif |
| 120 | |
| 121 | /* |
| 122 | * TCP attaches to socket via pru_attach(), reserving space, |
| 123 | * and an internet control block. |
| 124 | */ |
| 125 | static int |
| 126 | tcp_usr_attach(struct socket *so, int proto, struct pru_attach_info *ai) |
| 127 | { |
| 128 | int s = splnet(); |
| 129 | int error; |
| 130 | struct inpcb *inp = sotoinpcb(so); |
| 131 | struct tcpcb *tp = 0; |
| 132 | TCPDEBUG0; |
| 133 | |
| 134 | TCPDEBUG1(); |
| 135 | if (inp) { |
| 136 | error = EISCONN; |
| 137 | goto out; |
| 138 | } |
| 139 | |
| 140 | error = tcp_attach(so, ai); |
| 141 | if (error) |
| 142 | goto out; |
| 143 | |
| 144 | if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
| 145 | so->so_linger = TCP_LINGERTIME; |
| 146 | tp = sototcpcb(so); |
| 147 | out: |
| 148 | TCPDEBUG2(PRU_ATTACH); |
| 149 | splx(s); |
| 150 | return error; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * pru_detach() detaches the TCP protocol from the socket. |
| 155 | * If the protocol state is non-embryonic, then can't |
| 156 | * do this directly: have to initiate a pru_disconnect(), |
| 157 | * which may finish later; embryonic TCB's can just |
| 158 | * be discarded here. |
| 159 | */ |
| 160 | static int |
| 161 | tcp_usr_detach(struct socket *so) |
| 162 | { |
| 163 | int s = splnet(); |
| 164 | int error = 0; |
| 165 | struct inpcb *inp = sotoinpcb(so); |
| 166 | struct tcpcb *tp; |
| 167 | TCPDEBUG0; |
| 168 | |
| 169 | if (inp == 0) { |
| 170 | splx(s); |
| 171 | return EINVAL; /* XXX */ |
| 172 | } |
| 173 | tp = intotcpcb(inp); |
| 174 | TCPDEBUG1(); |
| 175 | tp = tcp_disconnect(tp); |
| 176 | |
| 177 | TCPDEBUG2(PRU_DETACH); |
| 178 | splx(s); |
| 179 | return error; |
| 180 | } |
| 181 | |
| 182 | #define COMMON_START() TCPDEBUG0; \ |
| 183 | do { \ |
| 184 | if (inp == 0) { \ |
| 185 | splx(s); \ |
| 186 | return EINVAL; \ |
| 187 | } \ |
| 188 | tp = intotcpcb(inp); \ |
| 189 | TCPDEBUG1(); \ |
| 190 | } while(0) |
| 191 | |
| 192 | #define COMMON_END(req) out: TCPDEBUG2(req); splx(s); return error; goto out |
| 193 | |
| 194 | |
| 195 | /* |
| 196 | * Give the socket an address. |
| 197 | */ |
| 198 | static int |
| 199 | tcp_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) |
| 200 | { |
| 201 | int s = splnet(); |
| 202 | int error = 0; |
| 203 | struct inpcb *inp = sotoinpcb(so); |
| 204 | struct tcpcb *tp; |
| 205 | struct sockaddr_in *sinp; |
| 206 | |
| 207 | COMMON_START(); |
| 208 | |
| 209 | /* |
| 210 | * Must check for multicast addresses and disallow binding |
| 211 | * to them. |
| 212 | */ |
| 213 | sinp = (struct sockaddr_in *)nam; |
| 214 | if (sinp->sin_family == AF_INET && |
| 215 | IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 216 | error = EAFNOSUPPORT; |
| 217 | goto out; |
| 218 | } |
| 219 | error = in_pcbbind(inp, nam, td); |
| 220 | if (error) |
| 221 | goto out; |
| 222 | COMMON_END(PRU_BIND); |
| 223 | |
| 224 | } |
| 225 | |
| 226 | #ifdef INET6 |
| 227 | static int |
| 228 | tcp6_usr_bind(struct socket *so, struct sockaddr *nam, struct thread *td) |
| 229 | { |
| 230 | int s = splnet(); |
| 231 | int error = 0; |
| 232 | struct inpcb *inp = sotoinpcb(so); |
| 233 | struct tcpcb *tp; |
| 234 | struct sockaddr_in6 *sin6p; |
| 235 | |
| 236 | COMMON_START(); |
| 237 | |
| 238 | /* |
| 239 | * Must check for multicast addresses and disallow binding |
| 240 | * to them. |
| 241 | */ |
| 242 | sin6p = (struct sockaddr_in6 *)nam; |
| 243 | if (sin6p->sin6_family == AF_INET6 && |
| 244 | IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 245 | error = EAFNOSUPPORT; |
| 246 | goto out; |
| 247 | } |
| 248 | inp->inp_vflag &= ~INP_IPV4; |
| 249 | inp->inp_vflag |= INP_IPV6; |
| 250 | if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) { |
| 251 | if (IN6_IS_ADDR_UNSPECIFIED(&sin6p->sin6_addr)) |
| 252 | inp->inp_vflag |= INP_IPV4; |
| 253 | else if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { |
| 254 | struct sockaddr_in sin; |
| 255 | |
| 256 | in6_sin6_2_sin(&sin, sin6p); |
| 257 | inp->inp_vflag |= INP_IPV4; |
| 258 | inp->inp_vflag &= ~INP_IPV6; |
| 259 | error = in_pcbbind(inp, (struct sockaddr *)&sin, td); |
| 260 | goto out; |
| 261 | } |
| 262 | } |
| 263 | error = in6_pcbbind(inp, nam, td); |
| 264 | if (error) |
| 265 | goto out; |
| 266 | COMMON_END(PRU_BIND); |
| 267 | } |
| 268 | #endif /* INET6 */ |
| 269 | |
| 270 | #ifdef SMP |
| 271 | struct netmsg_inswildcard { |
| 272 | struct lwkt_msg nm_lmsg; |
| 273 | struct inpcb *nm_inp; |
| 274 | struct inpcbinfo *nm_pcbinfo; |
| 275 | }; |
| 276 | |
| 277 | static int |
| 278 | in_pcbinswildcardhash_handler(struct lwkt_msg *msg0) |
| 279 | { |
| 280 | struct netmsg_inswildcard *msg = (struct netmsg_inswildcard *)msg0; |
| 281 | |
| 282 | in_pcbinswildcardhash_oncpu(msg->nm_inp, msg->nm_pcbinfo); |
| 283 | lwkt_replymsg(&msg->nm_lmsg, 0); |
| 284 | return (EASYNC); |
| 285 | } |
| 286 | #endif |
| 287 | |
| 288 | /* |
| 289 | * Prepare to accept connections. |
| 290 | */ |
| 291 | static int |
| 292 | tcp_usr_listen(struct socket *so, struct thread *td) |
| 293 | { |
| 294 | int s = splnet(); |
| 295 | int error = 0; |
| 296 | struct inpcb *inp = sotoinpcb(so); |
| 297 | struct tcpcb *tp; |
| 298 | #ifdef SMP |
| 299 | int cpu; |
| 300 | #endif |
| 301 | |
| 302 | COMMON_START(); |
| 303 | if (inp->inp_lport == 0) { |
| 304 | error = in_pcbbind(inp, NULL, td); |
| 305 | if (error != 0) |
| 306 | goto out; |
| 307 | } |
| 308 | |
| 309 | tp->t_state = TCPS_LISTEN; |
| 310 | #ifdef SMP |
| 311 | for (cpu = 0; cpu < ncpus2; cpu++) { |
| 312 | struct netmsg_inswildcard *msg; |
| 313 | |
| 314 | if (cpu == mycpu->gd_cpuid) { |
| 315 | in_pcbinswildcardhash_oncpu(inp, &tcbinfo[cpu]); |
| 316 | continue; |
| 317 | } |
| 318 | |
| 319 | msg = malloc(sizeof(struct netmsg_inswildcard), M_LWKTMSG, |
| 320 | M_INTWAIT); |
| 321 | lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0, |
| 322 | lwkt_cmd_func(in_pcbinswildcardhash_handler), |
| 323 | lwkt_cmd_op_none); |
| 324 | msg->nm_inp = inp; |
| 325 | msg->nm_pcbinfo = &tcbinfo[cpu]; |
| 326 | lwkt_sendmsg(tcp_cport(cpu), &msg->nm_lmsg); |
| 327 | } |
| 328 | inp->inp_flags |= INP_WILDCARD_MP; |
| 329 | #else |
| 330 | in_pcbinswildcardhash(inp); |
| 331 | #endif |
| 332 | COMMON_END(PRU_LISTEN); |
| 333 | } |
| 334 | |
| 335 | #ifdef INET6 |
| 336 | static int |
| 337 | tcp6_usr_listen(struct socket *so, struct thread *td) |
| 338 | { |
| 339 | int s = splnet(); |
| 340 | int error = 0; |
| 341 | struct inpcb *inp = sotoinpcb(so); |
| 342 | struct tcpcb *tp; |
| 343 | |
| 344 | COMMON_START(); |
| 345 | if (inp->inp_lport == 0) { |
| 346 | inp->inp_vflag &= ~INP_IPV4; |
| 347 | if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) |
| 348 | inp->inp_vflag |= INP_IPV4; |
| 349 | error = in6_pcbbind(inp, (struct sockaddr *)0, td); |
| 350 | } |
| 351 | if (error == 0) |
| 352 | tp->t_state = TCPS_LISTEN; |
| 353 | in_pcbinswildcardhash(inp); |
| 354 | COMMON_END(PRU_LISTEN); |
| 355 | } |
| 356 | #endif /* INET6 */ |
| 357 | |
| 358 | /* |
| 359 | * Initiate connection to peer. |
| 360 | * Create a template for use in transmissions on this connection. |
| 361 | * Enter SYN_SENT state, and mark socket as connecting. |
| 362 | * Start keep-alive timer, and seed output sequence space. |
| 363 | * Send initial segment on connection. |
| 364 | */ |
| 365 | static int |
| 366 | tcp_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) |
| 367 | { |
| 368 | int s = splnet(); |
| 369 | int error = 0; |
| 370 | struct inpcb *inp = sotoinpcb(so); |
| 371 | struct tcpcb *tp; |
| 372 | struct sockaddr_in *sinp; |
| 373 | |
| 374 | COMMON_START(); |
| 375 | |
| 376 | /* |
| 377 | * Must disallow TCP ``connections'' to multicast addresses. |
| 378 | */ |
| 379 | sinp = (struct sockaddr_in *)nam; |
| 380 | if (sinp->sin_family == AF_INET |
| 381 | && IN_MULTICAST(ntohl(sinp->sin_addr.s_addr))) { |
| 382 | error = EAFNOSUPPORT; |
| 383 | goto out; |
| 384 | } |
| 385 | |
| 386 | prison_remote_ip(td, 0, &sinp->sin_addr.s_addr); |
| 387 | |
| 388 | if ((error = tcp_connect(tp, nam, td)) != 0) |
| 389 | goto out; |
| 390 | error = tcp_output(tp); |
| 391 | COMMON_END(PRU_CONNECT); |
| 392 | } |
| 393 | |
| 394 | #ifdef INET6 |
| 395 | static int |
| 396 | tcp6_usr_connect(struct socket *so, struct sockaddr *nam, struct thread *td) |
| 397 | { |
| 398 | int s = splnet(); |
| 399 | int error = 0; |
| 400 | struct inpcb *inp = sotoinpcb(so); |
| 401 | struct tcpcb *tp; |
| 402 | struct sockaddr_in6 *sin6p; |
| 403 | |
| 404 | COMMON_START(); |
| 405 | |
| 406 | /* |
| 407 | * Must disallow TCP ``connections'' to multicast addresses. |
| 408 | */ |
| 409 | sin6p = (struct sockaddr_in6 *)nam; |
| 410 | if (sin6p->sin6_family == AF_INET6 |
| 411 | && IN6_IS_ADDR_MULTICAST(&sin6p->sin6_addr)) { |
| 412 | error = EAFNOSUPPORT; |
| 413 | goto out; |
| 414 | } |
| 415 | |
| 416 | if (IN6_IS_ADDR_V4MAPPED(&sin6p->sin6_addr)) { |
| 417 | struct sockaddr_in sin; |
| 418 | |
| 419 | if ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0) { |
| 420 | error = EINVAL; |
| 421 | goto out; |
| 422 | } |
| 423 | |
| 424 | in6_sin6_2_sin(&sin, sin6p); |
| 425 | inp->inp_vflag |= INP_IPV4; |
| 426 | inp->inp_vflag &= ~INP_IPV6; |
| 427 | if ((error = tcp_connect(tp, (struct sockaddr *)&sin, td)) != 0) |
| 428 | goto out; |
| 429 | error = tcp_output(tp); |
| 430 | goto out; |
| 431 | } |
| 432 | inp->inp_vflag &= ~INP_IPV4; |
| 433 | inp->inp_vflag |= INP_IPV6; |
| 434 | inp->inp_inc.inc_isipv6 = 1; |
| 435 | if ((error = tcp6_connect(tp, nam, td)) != 0) |
| 436 | goto out; |
| 437 | error = tcp_output(tp); |
| 438 | COMMON_END(PRU_CONNECT); |
| 439 | } |
| 440 | #endif /* INET6 */ |
| 441 | |
| 442 | /* |
| 443 | * Initiate disconnect from peer. |
| 444 | * If connection never passed embryonic stage, just drop; |
| 445 | * else if don't need to let data drain, then can just drop anyways, |
| 446 | * else have to begin TCP shutdown process: mark socket disconnecting, |
| 447 | * drain unread data, state switch to reflect user close, and |
| 448 | * send segment (e.g. FIN) to peer. Socket will be really disconnected |
| 449 | * when peer sends FIN and acks ours. |
| 450 | * |
| 451 | * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB. |
| 452 | */ |
| 453 | static int |
| 454 | tcp_usr_disconnect(struct socket *so) |
| 455 | { |
| 456 | int s = splnet(); |
| 457 | int error = 0; |
| 458 | struct inpcb *inp = sotoinpcb(so); |
| 459 | struct tcpcb *tp; |
| 460 | |
| 461 | COMMON_START(); |
| 462 | tp = tcp_disconnect(tp); |
| 463 | COMMON_END(PRU_DISCONNECT); |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Accept a connection. Essentially all the work is |
| 468 | * done at higher levels; just return the address |
| 469 | * of the peer, storing through addr. |
| 470 | */ |
| 471 | static int |
| 472 | tcp_usr_accept(struct socket *so, struct sockaddr **nam) |
| 473 | { |
| 474 | int s = splnet(); |
| 475 | int error = 0; |
| 476 | struct inpcb *inp = sotoinpcb(so); |
| 477 | struct tcpcb *tp = NULL; |
| 478 | TCPDEBUG0; |
| 479 | |
| 480 | if (so->so_state & SS_ISDISCONNECTED) { |
| 481 | error = ECONNABORTED; |
| 482 | goto out; |
| 483 | } |
| 484 | if (inp == 0) { |
| 485 | splx(s); |
| 486 | return (EINVAL); |
| 487 | } |
| 488 | tp = intotcpcb(inp); |
| 489 | TCPDEBUG1(); |
| 490 | in_setpeeraddr(so, nam); |
| 491 | COMMON_END(PRU_ACCEPT); |
| 492 | } |
| 493 | |
| 494 | #ifdef INET6 |
| 495 | static int |
| 496 | tcp6_usr_accept(struct socket *so, struct sockaddr **nam) |
| 497 | { |
| 498 | int s = splnet(); |
| 499 | int error = 0; |
| 500 | struct inpcb *inp = sotoinpcb(so); |
| 501 | struct tcpcb *tp = NULL; |
| 502 | TCPDEBUG0; |
| 503 | |
| 504 | if (so->so_state & SS_ISDISCONNECTED) { |
| 505 | error = ECONNABORTED; |
| 506 | goto out; |
| 507 | } |
| 508 | if (inp == 0) { |
| 509 | splx(s); |
| 510 | return (EINVAL); |
| 511 | } |
| 512 | tp = intotcpcb(inp); |
| 513 | TCPDEBUG1(); |
| 514 | in6_mapped_peeraddr(so, nam); |
| 515 | COMMON_END(PRU_ACCEPT); |
| 516 | } |
| 517 | #endif /* INET6 */ |
| 518 | /* |
| 519 | * Mark the connection as being incapable of further output. |
| 520 | */ |
| 521 | static int |
| 522 | tcp_usr_shutdown(struct socket *so) |
| 523 | { |
| 524 | int s = splnet(); |
| 525 | int error = 0; |
| 526 | struct inpcb *inp = sotoinpcb(so); |
| 527 | struct tcpcb *tp; |
| 528 | |
| 529 | COMMON_START(); |
| 530 | socantsendmore(so); |
| 531 | tp = tcp_usrclosed(tp); |
| 532 | if (tp) |
| 533 | error = tcp_output(tp); |
| 534 | COMMON_END(PRU_SHUTDOWN); |
| 535 | } |
| 536 | |
| 537 | /* |
| 538 | * After a receive, possibly send window update to peer. |
| 539 | */ |
| 540 | static int |
| 541 | tcp_usr_rcvd(struct socket *so, int flags) |
| 542 | { |
| 543 | int s = splnet(); |
| 544 | int error = 0; |
| 545 | struct inpcb *inp = sotoinpcb(so); |
| 546 | struct tcpcb *tp; |
| 547 | |
| 548 | COMMON_START(); |
| 549 | tcp_output(tp); |
| 550 | COMMON_END(PRU_RCVD); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Do a send by putting data in output queue and updating urgent |
| 555 | * marker if URG set. Possibly send more data. Unlike the other |
| 556 | * pru_*() routines, the mbuf chains are our responsibility. We |
| 557 | * must either enqueue them or free them. The other pru_* routines |
| 558 | * generally are caller-frees. |
| 559 | */ |
| 560 | static int |
| 561 | tcp_usr_send(struct socket *so, int flags, struct mbuf *m, |
| 562 | struct sockaddr *nam, struct mbuf *control, struct thread *td) |
| 563 | { |
| 564 | int s = splnet(); |
| 565 | int error = 0; |
| 566 | struct inpcb *inp = sotoinpcb(so); |
| 567 | struct tcpcb *tp; |
| 568 | #ifdef INET6 |
| 569 | int isipv6; |
| 570 | #endif |
| 571 | TCPDEBUG0; |
| 572 | |
| 573 | if (inp == NULL) { |
| 574 | /* |
| 575 | * OOPS! we lost a race, the TCP session got reset after |
| 576 | * we checked SS_CANTSENDMORE, eg: while doing uiomove or a |
| 577 | * network interrupt in the non-splnet() section of sosend(). |
| 578 | */ |
| 579 | if (m) |
| 580 | m_freem(m); |
| 581 | if (control) |
| 582 | m_freem(control); |
| 583 | error = ECONNRESET; /* XXX EPIPE? */ |
| 584 | tp = NULL; |
| 585 | TCPDEBUG1(); |
| 586 | goto out; |
| 587 | } |
| 588 | #ifdef INET6 |
| 589 | isipv6 = nam && nam->sa_family == AF_INET6; |
| 590 | #endif /* INET6 */ |
| 591 | tp = intotcpcb(inp); |
| 592 | TCPDEBUG1(); |
| 593 | if (control) { |
| 594 | /* TCP doesn't do control messages (rights, creds, etc) */ |
| 595 | if (control->m_len) { |
| 596 | m_freem(control); |
| 597 | if (m) |
| 598 | m_freem(m); |
| 599 | error = EINVAL; |
| 600 | goto out; |
| 601 | } |
| 602 | m_freem(control); /* empty control, just free it */ |
| 603 | } |
| 604 | if(!(flags & PRUS_OOB)) { |
| 605 | sbappend(&so->so_snd, m); |
| 606 | if (nam && tp->t_state < TCPS_SYN_SENT) { |
| 607 | /* |
| 608 | * Do implied connect if not yet connected, |
| 609 | * initialize window to default value, and |
| 610 | * initialize maxseg/maxopd using peer's cached |
| 611 | * MSS. |
| 612 | */ |
| 613 | #ifdef INET6 |
| 614 | if (isipv6) |
| 615 | error = tcp6_connect(tp, nam, td); |
| 616 | else |
| 617 | #endif /* INET6 */ |
| 618 | error = tcp_connect(tp, nam, td); |
| 619 | if (error) |
| 620 | goto out; |
| 621 | tp->snd_wnd = TTCP_CLIENT_SND_WND; |
| 622 | tcp_mss(tp, -1); |
| 623 | } |
| 624 | |
| 625 | if (flags & PRUS_EOF) { |
| 626 | /* |
| 627 | * Close the send side of the connection after |
| 628 | * the data is sent. |
| 629 | */ |
| 630 | socantsendmore(so); |
| 631 | tp = tcp_usrclosed(tp); |
| 632 | } |
| 633 | if (tp != NULL) { |
| 634 | if (flags & PRUS_MORETOCOME) |
| 635 | tp->t_flags |= TF_MORETOCOME; |
| 636 | error = tcp_output(tp); |
| 637 | if (flags & PRUS_MORETOCOME) |
| 638 | tp->t_flags &= ~TF_MORETOCOME; |
| 639 | } |
| 640 | } else { |
| 641 | if (sbspace(&so->so_snd) < -512) { |
| 642 | m_freem(m); |
| 643 | error = ENOBUFS; |
| 644 | goto out; |
| 645 | } |
| 646 | /* |
| 647 | * According to RFC961 (Assigned Protocols), |
| 648 | * the urgent pointer points to the last octet |
| 649 | * of urgent data. We continue, however, |
| 650 | * to consider it to indicate the first octet |
| 651 | * of data past the urgent section. |
| 652 | * Otherwise, snd_up should be one lower. |
| 653 | */ |
| 654 | sbappend(&so->so_snd, m); |
| 655 | if (nam && tp->t_state < TCPS_SYN_SENT) { |
| 656 | /* |
| 657 | * Do implied connect if not yet connected, |
| 658 | * initialize window to default value, and |
| 659 | * initialize maxseg/maxopd using peer's cached |
| 660 | * MSS. |
| 661 | */ |
| 662 | #ifdef INET6 |
| 663 | if (isipv6) |
| 664 | error = tcp6_connect(tp, nam, td); |
| 665 | else |
| 666 | #endif /* INET6 */ |
| 667 | error = tcp_connect(tp, nam, td); |
| 668 | if (error) |
| 669 | goto out; |
| 670 | tp->snd_wnd = TTCP_CLIENT_SND_WND; |
| 671 | tcp_mss(tp, -1); |
| 672 | } |
| 673 | tp->snd_up = tp->snd_una + so->so_snd.sb_cc; |
| 674 | tp->t_flags |= TF_FORCE; |
| 675 | error = tcp_output(tp); |
| 676 | tp->t_flags &= ~TF_FORCE; |
| 677 | } |
| 678 | COMMON_END((flags & PRUS_OOB) ? PRU_SENDOOB : |
| 679 | ((flags & PRUS_EOF) ? PRU_SEND_EOF : PRU_SEND)); |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Abort the TCP. |
| 684 | */ |
| 685 | static int |
| 686 | tcp_usr_abort(struct socket *so) |
| 687 | { |
| 688 | int s = splnet(); |
| 689 | int error = 0; |
| 690 | struct inpcb *inp = sotoinpcb(so); |
| 691 | struct tcpcb *tp; |
| 692 | |
| 693 | COMMON_START(); |
| 694 | tp = tcp_drop(tp, ECONNABORTED); |
| 695 | COMMON_END(PRU_ABORT); |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Receive out-of-band data. |
| 700 | */ |
| 701 | static int |
| 702 | tcp_usr_rcvoob(struct socket *so, struct mbuf *m, int flags) |
| 703 | { |
| 704 | int s = splnet(); |
| 705 | int error = 0; |
| 706 | struct inpcb *inp = sotoinpcb(so); |
| 707 | struct tcpcb *tp; |
| 708 | |
| 709 | COMMON_START(); |
| 710 | if ((so->so_oobmark == 0 && |
| 711 | (so->so_state & SS_RCVATMARK) == 0) || |
| 712 | so->so_options & SO_OOBINLINE || |
| 713 | tp->t_oobflags & TCPOOB_HADDATA) { |
| 714 | error = EINVAL; |
| 715 | goto out; |
| 716 | } |
| 717 | if ((tp->t_oobflags & TCPOOB_HAVEDATA) == 0) { |
| 718 | error = EWOULDBLOCK; |
| 719 | goto out; |
| 720 | } |
| 721 | m->m_len = 1; |
| 722 | *mtod(m, caddr_t) = tp->t_iobc; |
| 723 | if ((flags & MSG_PEEK) == 0) |
| 724 | tp->t_oobflags ^= (TCPOOB_HAVEDATA | TCPOOB_HADDATA); |
| 725 | COMMON_END(PRU_RCVOOB); |
| 726 | } |
| 727 | |
| 728 | /* xxx - should be const */ |
| 729 | struct pr_usrreqs tcp_usrreqs = { |
| 730 | tcp_usr_abort, tcp_usr_accept, tcp_usr_attach, tcp_usr_bind, |
| 731 | tcp_usr_connect, pru_connect2_notsupp, in_control, tcp_usr_detach, |
| 732 | tcp_usr_disconnect, tcp_usr_listen, in_setpeeraddr, tcp_usr_rcvd, |
| 733 | tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, |
| 734 | in_setsockaddr, sosend, soreceive, sopoll |
| 735 | }; |
| 736 | |
| 737 | #ifdef INET6 |
| 738 | struct pr_usrreqs tcp6_usrreqs = { |
| 739 | tcp_usr_abort, tcp6_usr_accept, tcp_usr_attach, tcp6_usr_bind, |
| 740 | tcp6_usr_connect, pru_connect2_notsupp, in6_control, tcp_usr_detach, |
| 741 | tcp_usr_disconnect, tcp6_usr_listen, in6_mapped_peeraddr, tcp_usr_rcvd, |
| 742 | tcp_usr_rcvoob, tcp_usr_send, pru_sense_null, tcp_usr_shutdown, |
| 743 | in6_mapped_sockaddr, sosend, soreceive, sopoll |
| 744 | }; |
| 745 | #endif /* INET6 */ |
| 746 | |
| 747 | static int |
| 748 | tcp_connect_oncpu(struct tcpcb *tp, struct sockaddr_in *sin, |
| 749 | struct sockaddr_in *if_sin) |
| 750 | { |
| 751 | struct inpcb *inp = tp->t_inpcb, *oinp; |
| 752 | struct socket *so = inp->inp_socket; |
| 753 | struct tcpcb *otp; |
| 754 | struct rmxp_tao *taop; |
| 755 | struct rmxp_tao tao_noncached; |
| 756 | |
| 757 | oinp = in_pcblookup_hash(&tcbinfo[mycpu->gd_cpuid], |
| 758 | sin->sin_addr, sin->sin_port, |
| 759 | inp->inp_laddr.s_addr != INADDR_ANY ? |
| 760 | inp->inp_laddr : if_sin->sin_addr, |
| 761 | inp->inp_lport, 0, NULL); |
| 762 | if (oinp != NULL) { |
| 763 | if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && |
| 764 | otp->t_state == TCPS_TIME_WAIT && |
| 765 | (ticks - otp->t_starttime) < tcp_msl && |
| 766 | (otp->t_flags & TF_RCVD_CC)) |
| 767 | (void) tcp_close(otp); |
| 768 | else |
| 769 | return (EADDRINUSE); |
| 770 | } |
| 771 | if (inp->inp_laddr.s_addr == INADDR_ANY) |
| 772 | inp->inp_laddr = if_sin->sin_addr; |
| 773 | inp->inp_faddr = sin->sin_addr; |
| 774 | inp->inp_fport = sin->sin_port; |
| 775 | inp->inp_cpcbinfo = &tcbinfo[mycpu->gd_cpuid]; |
| 776 | in_pcbinsconnhash(inp); |
| 777 | |
| 778 | /* Compute window scaling to request. */ |
| 779 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 780 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) |
| 781 | tp->request_r_scale++; |
| 782 | |
| 783 | soisconnecting(so); |
| 784 | tcpstat.tcps_connattempt++; |
| 785 | tp->t_state = TCPS_SYN_SENT; |
| 786 | callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); |
| 787 | tp->iss = tcp_new_isn(tp); |
| 788 | tp->t_bw_rtseq = tp->iss; |
| 789 | tcp_sendseqinit(tp); |
| 790 | |
| 791 | /* |
| 792 | * Generate a CC value for this connection and |
| 793 | * check whether CC or CCnew should be used. |
| 794 | */ |
| 795 | if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { |
| 796 | taop = &tao_noncached; |
| 797 | bzero(taop, sizeof(*taop)); |
| 798 | } |
| 799 | |
| 800 | tp->cc_send = CC_INC(tcp_ccgen); |
| 801 | if (taop->tao_ccsent != 0 && |
| 802 | CC_GEQ(tp->cc_send, taop->tao_ccsent)) { |
| 803 | taop->tao_ccsent = tp->cc_send; |
| 804 | } else { |
| 805 | taop->tao_ccsent = 0; |
| 806 | tp->t_flags |= TF_SENDCCNEW; |
| 807 | } |
| 808 | |
| 809 | return (0); |
| 810 | } |
| 811 | |
| 812 | #ifdef SMP |
| 813 | |
| 814 | struct netmsg_tcp_connect { |
| 815 | struct lwkt_msg nm_lmsg; |
| 816 | struct tcpcb *nm_tp; |
| 817 | struct sockaddr_in *nm_sin; |
| 818 | struct sockaddr_in *nm_ifsin; |
| 819 | }; |
| 820 | |
| 821 | static int |
| 822 | tcp_connect_handler(lwkt_msg_t lmsg) |
| 823 | { |
| 824 | struct netmsg_tcp_connect *msg = (void *)lmsg; |
| 825 | int error; |
| 826 | |
| 827 | error = tcp_connect_oncpu(msg->nm_tp, msg->nm_sin, msg->nm_ifsin); |
| 828 | lwkt_replymsg(lmsg, error); |
| 829 | return(EASYNC); |
| 830 | } |
| 831 | |
| 832 | #endif |
| 833 | |
| 834 | /* |
| 835 | * Common subroutine to open a TCP connection to remote host specified |
| 836 | * by struct sockaddr_in in mbuf *nam. Call in_pcbbind to assign a local |
| 837 | * port number if needed. Call in_pcbladdr to do the routing and to choose |
| 838 | * a local host address (interface). If there is an existing incarnation |
| 839 | * of the same connection in TIME-WAIT state and if the remote host was |
| 840 | * sending CC options and if the connection duration was < MSL, then |
| 841 | * truncate the previous TIME-WAIT state and proceed. |
| 842 | * Initialize connection parameters and enter SYN-SENT state. |
| 843 | */ |
| 844 | static int |
| 845 | tcp_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) |
| 846 | { |
| 847 | struct inpcb *inp = tp->t_inpcb; |
| 848 | struct sockaddr_in *sin = (struct sockaddr_in *)nam; |
| 849 | struct sockaddr_in *if_sin; |
| 850 | int error; |
| 851 | #ifdef SMP |
| 852 | lwkt_port_t port; |
| 853 | #endif |
| 854 | |
| 855 | if (inp->inp_lport == 0) { |
| 856 | error = in_pcbbind(inp, (struct sockaddr *)NULL, td); |
| 857 | if (error) |
| 858 | return (error); |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Cannot simply call in_pcbconnect, because there might be an |
| 863 | * earlier incarnation of this same connection still in |
| 864 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 865 | */ |
| 866 | error = in_pcbladdr(inp, nam, &if_sin); |
| 867 | if (error) |
| 868 | return (error); |
| 869 | |
| 870 | #ifdef SMP |
| 871 | port = tcp_addrport(sin->sin_addr.s_addr, sin->sin_port, |
| 872 | inp->inp_laddr.s_addr ? |
| 873 | inp->inp_laddr.s_addr : if_sin->sin_addr.s_addr, |
| 874 | inp->inp_lport); |
| 875 | |
| 876 | if (port->mp_td != curthread) { |
| 877 | struct netmsg_tcp_connect msg; |
| 878 | |
| 879 | lwkt_initmsg(&msg.nm_lmsg, &curthread->td_msgport, 0, |
| 880 | lwkt_cmd_func(tcp_connect_handler), lwkt_cmd_op_none); |
| 881 | msg.nm_tp = tp; |
| 882 | msg.nm_sin = sin; |
| 883 | msg.nm_ifsin = if_sin; |
| 884 | error = lwkt_domsg(port, &msg.nm_lmsg); |
| 885 | } else |
| 886 | #endif |
| 887 | error = tcp_connect_oncpu(tp, sin, if_sin); |
| 888 | |
| 889 | return (error); |
| 890 | } |
| 891 | |
| 892 | #ifdef INET6 |
| 893 | static int |
| 894 | tcp6_connect(struct tcpcb *tp, struct sockaddr *nam, struct thread *td) |
| 895 | { |
| 896 | struct inpcb *inp = tp->t_inpcb, *oinp; |
| 897 | struct socket *so = inp->inp_socket; |
| 898 | struct tcpcb *otp; |
| 899 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; |
| 900 | struct in6_addr *addr6; |
| 901 | struct rmxp_tao *taop; |
| 902 | struct rmxp_tao tao_noncached; |
| 903 | int error; |
| 904 | |
| 905 | if (inp->inp_lport == 0) { |
| 906 | error = in6_pcbbind(inp, (struct sockaddr *)0, td); |
| 907 | if (error) |
| 908 | return error; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * Cannot simply call in_pcbconnect, because there might be an |
| 913 | * earlier incarnation of this same connection still in |
| 914 | * TIME_WAIT state, creating an ADDRINUSE error. |
| 915 | */ |
| 916 | error = in6_pcbladdr(inp, nam, &addr6); |
| 917 | if (error) |
| 918 | return error; |
| 919 | oinp = in6_pcblookup_hash(inp->inp_cpcbinfo, |
| 920 | &sin6->sin6_addr, sin6->sin6_port, |
| 921 | IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? |
| 922 | addr6 : &inp->in6p_laddr, |
| 923 | inp->inp_lport, 0, NULL); |
| 924 | if (oinp) { |
| 925 | if (oinp != inp && (otp = intotcpcb(oinp)) != NULL && |
| 926 | otp->t_state == TCPS_TIME_WAIT && |
| 927 | (ticks - otp->t_starttime) < tcp_msl && |
| 928 | (otp->t_flags & TF_RCVD_CC)) |
| 929 | otp = tcp_close(otp); |
| 930 | else |
| 931 | return (EADDRINUSE); |
| 932 | } |
| 933 | if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) |
| 934 | inp->in6p_laddr = *addr6; |
| 935 | inp->in6p_faddr = sin6->sin6_addr; |
| 936 | inp->inp_fport = sin6->sin6_port; |
| 937 | if ((sin6->sin6_flowinfo & IPV6_FLOWINFO_MASK) != NULL) |
| 938 | inp->in6p_flowinfo = sin6->sin6_flowinfo; |
| 939 | in_pcbinsconnhash(inp); |
| 940 | |
| 941 | /* Compute window scaling to request. */ |
| 942 | while (tp->request_r_scale < TCP_MAX_WINSHIFT && |
| 943 | (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) |
| 944 | tp->request_r_scale++; |
| 945 | |
| 946 | soisconnecting(so); |
| 947 | tcpstat.tcps_connattempt++; |
| 948 | tp->t_state = TCPS_SYN_SENT; |
| 949 | callout_reset(tp->tt_keep, tcp_keepinit, tcp_timer_keep, tp); |
| 950 | tp->iss = tcp_new_isn(tp); |
| 951 | tp->t_bw_rtseq = tp->iss; |
| 952 | tcp_sendseqinit(tp); |
| 953 | |
| 954 | /* |
| 955 | * Generate a CC value for this connection and |
| 956 | * check whether CC or CCnew should be used. |
| 957 | */ |
| 958 | if ((taop = tcp_gettaocache(&tp->t_inpcb->inp_inc)) == NULL) { |
| 959 | taop = &tao_noncached; |
| 960 | bzero(taop, sizeof(*taop)); |
| 961 | } |
| 962 | |
| 963 | tp->cc_send = CC_INC(tcp_ccgen); |
| 964 | if (taop->tao_ccsent != 0 && |
| 965 | CC_GEQ(tp->cc_send, taop->tao_ccsent)) { |
| 966 | taop->tao_ccsent = tp->cc_send; |
| 967 | } else { |
| 968 | taop->tao_ccsent = 0; |
| 969 | tp->t_flags |= TF_SENDCCNEW; |
| 970 | } |
| 971 | |
| 972 | return (0); |
| 973 | } |
| 974 | #endif /* INET6 */ |
| 975 | |
| 976 | /* |
| 977 | * The new sockopt interface makes it possible for us to block in the |
| 978 | * copyin/out step (if we take a page fault). Taking a page fault at |
| 979 | * splnet() is probably a Bad Thing. (Since sockets and pcbs both now |
| 980 | * use TSM, there probably isn't any need for this function to run at |
| 981 | * splnet() any more. This needs more examination.) |
| 982 | */ |
| 983 | int |
| 984 | tcp_ctloutput(so, sopt) |
| 985 | struct socket *so; |
| 986 | struct sockopt *sopt; |
| 987 | { |
| 988 | int error, opt, optval, s; |
| 989 | struct inpcb *inp; |
| 990 | struct tcpcb *tp; |
| 991 | |
| 992 | error = 0; |
| 993 | s = splnet(); /* XXX */ |
| 994 | inp = sotoinpcb(so); |
| 995 | if (inp == NULL) { |
| 996 | splx(s); |
| 997 | return (ECONNRESET); |
| 998 | } |
| 999 | if (sopt->sopt_level != IPPROTO_TCP) { |
| 1000 | #ifdef INET6 |
| 1001 | if (INP_CHECK_SOCKAF(so, AF_INET6)) |
| 1002 | error = ip6_ctloutput(so, sopt); |
| 1003 | else |
| 1004 | #endif /* INET6 */ |
| 1005 | error = ip_ctloutput(so, sopt); |
| 1006 | splx(s); |
| 1007 | return (error); |
| 1008 | } |
| 1009 | tp = intotcpcb(inp); |
| 1010 | |
| 1011 | switch (sopt->sopt_dir) { |
| 1012 | case SOPT_SET: |
| 1013 | switch (sopt->sopt_name) { |
| 1014 | case TCP_NODELAY: |
| 1015 | case TCP_NOOPT: |
| 1016 | error = sooptcopyin(sopt, &optval, sizeof optval, |
| 1017 | sizeof optval); |
| 1018 | if (error) |
| 1019 | break; |
| 1020 | |
| 1021 | switch (sopt->sopt_name) { |
| 1022 | case TCP_NODELAY: |
| 1023 | opt = TF_NODELAY; |
| 1024 | break; |
| 1025 | case TCP_NOOPT: |
| 1026 | opt = TF_NOOPT; |
| 1027 | break; |
| 1028 | default: |
| 1029 | opt = 0; /* dead code to fool gcc */ |
| 1030 | break; |
| 1031 | } |
| 1032 | |
| 1033 | if (optval) |
| 1034 | tp->t_flags |= opt; |
| 1035 | else |
| 1036 | tp->t_flags &= ~opt; |
| 1037 | break; |
| 1038 | |
| 1039 | case TCP_NOPUSH: |
| 1040 | error = sooptcopyin(sopt, &optval, sizeof optval, |
| 1041 | sizeof optval); |
| 1042 | if (error) |
| 1043 | break; |
| 1044 | |
| 1045 | if (optval) |
| 1046 | tp->t_flags |= TF_NOPUSH; |
| 1047 | else { |
| 1048 | tp->t_flags &= ~TF_NOPUSH; |
| 1049 | error = tcp_output(tp); |
| 1050 | } |
| 1051 | break; |
| 1052 | |
| 1053 | case TCP_MAXSEG: |
| 1054 | error = sooptcopyin(sopt, &optval, sizeof optval, |
| 1055 | sizeof optval); |
| 1056 | if (error) |
| 1057 | break; |
| 1058 | |
| 1059 | if (optval > 0 && optval <= tp->t_maxseg) |
| 1060 | tp->t_maxseg = optval; |
| 1061 | else |
| 1062 | error = EINVAL; |
| 1063 | break; |
| 1064 | |
| 1065 | default: |
| 1066 | error = ENOPROTOOPT; |
| 1067 | break; |
| 1068 | } |
| 1069 | break; |
| 1070 | |
| 1071 | case SOPT_GET: |
| 1072 | switch (sopt->sopt_name) { |
| 1073 | case TCP_NODELAY: |
| 1074 | optval = tp->t_flags & TF_NODELAY; |
| 1075 | break; |
| 1076 | case TCP_MAXSEG: |
| 1077 | optval = tp->t_maxseg; |
| 1078 | break; |
| 1079 | case TCP_NOOPT: |
| 1080 | optval = tp->t_flags & TF_NOOPT; |
| 1081 | break; |
| 1082 | case TCP_NOPUSH: |
| 1083 | optval = tp->t_flags & TF_NOPUSH; |
| 1084 | break; |
| 1085 | default: |
| 1086 | error = ENOPROTOOPT; |
| 1087 | break; |
| 1088 | } |
| 1089 | if (error == 0) |
| 1090 | error = sooptcopyout(sopt, &optval, sizeof optval); |
| 1091 | break; |
| 1092 | } |
| 1093 | splx(s); |
| 1094 | return (error); |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * tcp_sendspace and tcp_recvspace are the default send and receive window |
| 1099 | * sizes, respectively. These are obsolescent (this information should |
| 1100 | * be set by the route). |
| 1101 | */ |
| 1102 | u_long tcp_sendspace = 1024*32; |
| 1103 | SYSCTL_INT(_net_inet_tcp, TCPCTL_SENDSPACE, sendspace, CTLFLAG_RW, |
| 1104 | &tcp_sendspace , 0, "Maximum outgoing TCP datagram size"); |
| 1105 | u_long tcp_recvspace = 57344; /* largest multiple of PAGE_SIZE < 64k */ |
| 1106 | SYSCTL_INT(_net_inet_tcp, TCPCTL_RECVSPACE, recvspace, CTLFLAG_RW, |
| 1107 | &tcp_recvspace , 0, "Maximum incoming TCP datagram size"); |
| 1108 | |
| 1109 | /* |
| 1110 | * Attach TCP protocol to socket, allocating |
| 1111 | * internet protocol control block, tcp control block, |
| 1112 | * bufer space, and entering LISTEN state if to accept connections. |
| 1113 | */ |
| 1114 | static int |
| 1115 | tcp_attach(struct socket *so, struct pru_attach_info *ai) |
| 1116 | { |
| 1117 | struct tcpcb *tp; |
| 1118 | struct inpcb *inp; |
| 1119 | int error; |
| 1120 | int cpu; |
| 1121 | #ifdef INET6 |
| 1122 | int isipv6 = INP_CHECK_SOCKAF(so, AF_INET6) != NULL; |
| 1123 | #endif |
| 1124 | |
| 1125 | if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { |
| 1126 | error = soreserve(so, tcp_sendspace, tcp_recvspace, |
| 1127 | ai->sb_rlimit); |
| 1128 | if (error) |
| 1129 | return (error); |
| 1130 | } |
| 1131 | cpu = mycpu->gd_cpuid; |
| 1132 | error = in_pcballoc(so, &tcbinfo[cpu]); |
| 1133 | if (error) |
| 1134 | return (error); |
| 1135 | inp = sotoinpcb(so); |
| 1136 | #ifdef INET6 |
| 1137 | if (isipv6) { |
| 1138 | inp->inp_vflag |= INP_IPV6; |
| 1139 | inp->in6p_hops = -1; /* use kernel default */ |
| 1140 | } |
| 1141 | else |
| 1142 | #endif |
| 1143 | inp->inp_vflag |= INP_IPV4; |
| 1144 | tp = tcp_newtcpcb(inp); |
| 1145 | if (tp == 0) { |
| 1146 | int nofd = so->so_state & SS_NOFDREF; /* XXX */ |
| 1147 | |
| 1148 | so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */ |
| 1149 | #ifdef INET6 |
| 1150 | if (isipv6) |
| 1151 | in6_pcbdetach(inp); |
| 1152 | else |
| 1153 | #endif |
| 1154 | in_pcbdetach(inp); |
| 1155 | so->so_state |= nofd; |
| 1156 | return (ENOBUFS); |
| 1157 | } |
| 1158 | tp->t_state = TCPS_CLOSED; |
| 1159 | return (0); |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * Initiate (or continue) disconnect. |
| 1164 | * If embryonic state, just send reset (once). |
| 1165 | * If in ``let data drain'' option and linger null, just drop. |
| 1166 | * Otherwise (hard), mark socket disconnecting and drop |
| 1167 | * current input data; switch states based on user close, and |
| 1168 | * send segment to peer (with FIN). |
| 1169 | */ |
| 1170 | static struct tcpcb * |
| 1171 | tcp_disconnect(tp) |
| 1172 | struct tcpcb *tp; |
| 1173 | { |
| 1174 | struct socket *so = tp->t_inpcb->inp_socket; |
| 1175 | |
| 1176 | if (tp->t_state < TCPS_ESTABLISHED) |
| 1177 | tp = tcp_close(tp); |
| 1178 | else if ((so->so_options & SO_LINGER) && so->so_linger == 0) |
| 1179 | tp = tcp_drop(tp, 0); |
| 1180 | else { |
| 1181 | soisdisconnecting(so); |
| 1182 | sbflush(&so->so_rcv); |
| 1183 | tp = tcp_usrclosed(tp); |
| 1184 | if (tp) |
| 1185 | (void) tcp_output(tp); |
| 1186 | } |
| 1187 | return (tp); |
| 1188 | } |
| 1189 | |
| 1190 | /* |
| 1191 | * User issued close, and wish to trail through shutdown states: |
| 1192 | * if never received SYN, just forget it. If got a SYN from peer, |
| 1193 | * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. |
| 1194 | * If already got a FIN from peer, then almost done; go to LAST_ACK |
| 1195 | * state. In all other cases, have already sent FIN to peer (e.g. |
| 1196 | * after PRU_SHUTDOWN), and just have to play tedious game waiting |
| 1197 | * for peer to send FIN or not respond to keep-alives, etc. |
| 1198 | * We can let the user exit from the close as soon as the FIN is acked. |
| 1199 | */ |
| 1200 | static struct tcpcb * |
| 1201 | tcp_usrclosed(tp) |
| 1202 | struct tcpcb *tp; |
| 1203 | { |
| 1204 | |
| 1205 | switch (tp->t_state) { |
| 1206 | |
| 1207 | case TCPS_CLOSED: |
| 1208 | case TCPS_LISTEN: |
| 1209 | tp->t_state = TCPS_CLOSED; |
| 1210 | tp = tcp_close(tp); |
| 1211 | break; |
| 1212 | |
| 1213 | case TCPS_SYN_SENT: |
| 1214 | case TCPS_SYN_RECEIVED: |
| 1215 | tp->t_flags |= TF_NEEDFIN; |
| 1216 | break; |
| 1217 | |
| 1218 | case TCPS_ESTABLISHED: |
| 1219 | tp->t_state = TCPS_FIN_WAIT_1; |
| 1220 | break; |
| 1221 | |
| 1222 | case TCPS_CLOSE_WAIT: |
| 1223 | tp->t_state = TCPS_LAST_ACK; |
| 1224 | break; |
| 1225 | } |
| 1226 | if (tp && tp->t_state >= TCPS_FIN_WAIT_2) { |
| 1227 | soisdisconnected(tp->t_inpcb->inp_socket); |
| 1228 | /* To prevent the connection hanging in FIN_WAIT_2 forever. */ |
| 1229 | if (tp->t_state == TCPS_FIN_WAIT_2) |
| 1230 | callout_reset(tp->tt_2msl, tcp_maxidle, |
| 1231 | tcp_timer_2msl, tp); |
| 1232 | } |
| 1233 | return (tp); |
| 1234 | } |