raw_ip.c revision 1.54
1 /* $NetBSD: raw_ip.c,v 1.54 2001/01/24 09:04:15 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgement: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * 4. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 65 */ 66 67 #include "opt_ipsec.h" 68 #include "opt_mrouting.h" 69 70 #include <sys/param.h> 71 #include <sys/malloc.h> 72 #include <sys/mbuf.h> 73 #include <sys/socket.h> 74 #include <sys/protosw.h> 75 #include <sys/socketvar.h> 76 #include <sys/errno.h> 77 #include <sys/systm.h> 78 #include <sys/proc.h> 79 80 #include <net/if.h> 81 #include <net/route.h> 82 83 #include <netinet/in.h> 84 #include <netinet/in_systm.h> 85 #include <netinet/ip.h> 86 #include <netinet/ip_var.h> 87 #include <netinet/ip_mroute.h> 88 #include <netinet/ip_icmp.h> 89 #include <netinet/in_pcb.h> 90 #include <netinet/in_var.h> 91 92 #include <machine/stdarg.h> 93 94 #ifdef IPSEC 95 #include <netinet6/ipsec.h> 96 #endif /*IPSEC*/ 97 98 struct inpcbtable rawcbtable; 99 100 int rip_bind __P((struct inpcb *, struct mbuf *)); 101 int rip_connect __P((struct inpcb *, struct mbuf *)); 102 void rip_disconnect __P((struct inpcb *)); 103 104 /* 105 * Nominal space allocated to a raw ip socket. 106 */ 107 #define RIPSNDQ 8192 108 #define RIPRCVQ 8192 109 110 /* 111 * Raw interface to IP protocol. 112 */ 113 114 /* 115 * Initialize raw connection block q. 116 */ 117 void 118 rip_init() 119 { 120 121 in_pcbinit(&rawcbtable, 1, 1); 122 } 123 124 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 125 126 /* 127 * Setup generic address and protocol structures 128 * for raw_input routine, then pass them along with 129 * mbuf chain. 130 */ 131 void 132 #if __STDC__ 133 rip_input(struct mbuf *m, ...) 134 #else 135 rip_input(m, va_alist) 136 struct mbuf *m; 137 va_dcl 138 #endif 139 { 140 int off, proto; 141 struct ip *ip = mtod(m, struct ip *); 142 struct inpcb *inp; 143 struct inpcb *last = 0; 144 struct mbuf *opts = 0; 145 struct sockaddr_in ripsrc; 146 va_list ap; 147 148 va_start(ap, m); 149 off = va_arg(ap, int); 150 proto = va_arg(ap, int); 151 va_end(ap); 152 153 ripsrc.sin_family = AF_INET; 154 ripsrc.sin_len = sizeof(struct sockaddr_in); 155 ripsrc.sin_addr = ip->ip_src; 156 ripsrc.sin_port = 0; 157 bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero)); 158 159 /* 160 * XXX Compatibility: programs using raw IP expect ip_len 161 * XXX to have the header length subtracted. 162 */ 163 ip->ip_len -= ip->ip_hl << 2; 164 165 for (inp = rawcbtable.inpt_queue.cqh_first; 166 inp != (struct inpcb *)&rawcbtable.inpt_queue; 167 inp = inp->inp_queue.cqe_next) { 168 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 169 continue; 170 if (!in_nullhost(inp->inp_laddr) && 171 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 172 continue; 173 if (!in_nullhost(inp->inp_faddr) && 174 !in_hosteq(inp->inp_faddr, ip->ip_src)) 175 continue; 176 if (last) { 177 struct mbuf *n; 178 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 179 if (last->inp_flags & INP_CONTROLOPTS || 180 last->inp_socket->so_options & SO_TIMESTAMP) 181 ip_savecontrol(last, &opts, ip, n); 182 if (sbappendaddr(&last->inp_socket->so_rcv, 183 sintosa(&ripsrc), n, opts) == 0) { 184 /* should notify about lost packet */ 185 m_freem(n); 186 if (opts) 187 m_freem(opts); 188 } else 189 sorwakeup(last->inp_socket); 190 opts = NULL; 191 } 192 } 193 last = inp; 194 } 195 if (last) { 196 if (last->inp_flags & INP_CONTROLOPTS || 197 last->inp_socket->so_options & SO_TIMESTAMP) 198 ip_savecontrol(last, &opts, ip, m); 199 if (sbappendaddr(&last->inp_socket->so_rcv, 200 sintosa(&ripsrc), m, opts) == 0) { 201 m_freem(m); 202 if (opts) 203 m_freem(opts); 204 } else 205 sorwakeup(last->inp_socket); 206 } else { 207 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) { 208 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 209 0, 0); 210 ipstat.ips_noproto++; 211 ipstat.ips_delivered--; 212 } else 213 m_freem(m); 214 } 215 return; 216 } 217 218 /* 219 * Generate IP header and pass packet to ip_output. 220 * Tack on options user may have setup with control call. 221 */ 222 int 223 #if __STDC__ 224 rip_output(struct mbuf *m, ...) 225 #else 226 rip_output(m, va_alist) 227 struct mbuf *m; 228 va_dcl 229 #endif 230 { 231 struct inpcb *inp; 232 struct ip *ip; 233 struct mbuf *opts; 234 int flags; 235 va_list ap; 236 237 va_start(ap, m); 238 inp = va_arg(ap, struct inpcb *); 239 va_end(ap); 240 241 flags = 242 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST 243 | IP_RETURNMTU; 244 245 /* 246 * If the user handed us a complete IP packet, use it. 247 * Otherwise, allocate an mbuf for a header and fill it in. 248 */ 249 if ((inp->inp_flags & INP_HDRINCL) == 0) { 250 if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) { 251 m_freem(m); 252 return (EMSGSIZE); 253 } 254 M_PREPEND(m, sizeof(struct ip), M_WAIT); 255 ip = mtod(m, struct ip *); 256 ip->ip_tos = 0; 257 ip->ip_off = 0; 258 ip->ip_p = inp->inp_ip.ip_p; 259 ip->ip_len = m->m_pkthdr.len; 260 ip->ip_src = inp->inp_laddr; 261 ip->ip_dst = inp->inp_faddr; 262 ip->ip_ttl = MAXTTL; 263 opts = inp->inp_options; 264 } else { 265 if (m->m_pkthdr.len > IP_MAXPACKET) { 266 m_freem(m); 267 return (EMSGSIZE); 268 } 269 ip = mtod(m, struct ip *); 270 if (m->m_pkthdr.len != ip->ip_len) { 271 m_freem(m); 272 return (EINVAL); 273 } 274 if (ip->ip_id == 0) 275 ip->ip_id = htons(ip_id++); 276 opts = NULL; 277 /* XXX prevent ip_output from overwriting header fields */ 278 flags |= IP_RAWOUTPUT; 279 ipstat.ips_rawout++; 280 } 281 #ifdef IPSEC 282 if (ipsec_setsocket(m, inp->inp_socket) != 0) { 283 m_freem(m); 284 return ENOBUFS; 285 } 286 #endif /*IPSEC*/ 287 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu)); 288 } 289 290 /* 291 * Raw IP socket option processing. 292 */ 293 int 294 rip_ctloutput(op, so, level, optname, m) 295 int op; 296 struct socket *so; 297 int level, optname; 298 struct mbuf **m; 299 { 300 struct inpcb *inp = sotoinpcb(so); 301 int error = 0; 302 303 if (level != IPPROTO_IP) { 304 error = ENOPROTOOPT; 305 if (op == PRCO_SETOPT && *m != 0) 306 (void) m_free(*m); 307 } else switch (op) { 308 309 case PRCO_SETOPT: 310 switch (optname) { 311 case IP_HDRINCL: 312 if (*m == 0 || (*m)->m_len < sizeof (int)) 313 error = EINVAL; 314 else { 315 if (*mtod(*m, int *)) 316 inp->inp_flags |= INP_HDRINCL; 317 else 318 inp->inp_flags &= ~INP_HDRINCL; 319 } 320 if (*m != 0) 321 (void) m_free(*m); 322 break; 323 324 #ifdef MROUTING 325 case MRT_INIT: 326 case MRT_DONE: 327 case MRT_ADD_VIF: 328 case MRT_DEL_VIF: 329 case MRT_ADD_MFC: 330 case MRT_DEL_MFC: 331 case MRT_ASSERT: 332 error = ip_mrouter_set(so, optname, m); 333 break; 334 #endif 335 336 default: 337 error = ip_ctloutput(op, so, level, optname, m); 338 break; 339 } 340 break; 341 342 case PRCO_GETOPT: 343 switch (optname) { 344 case IP_HDRINCL: 345 *m = m_get(M_WAIT, M_SOOPTS); 346 (*m)->m_len = sizeof (int); 347 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 348 break; 349 350 #ifdef MROUTING 351 case MRT_VERSION: 352 case MRT_ASSERT: 353 error = ip_mrouter_get(so, optname, m); 354 break; 355 #endif 356 357 default: 358 error = ip_ctloutput(op, so, level, optname, m); 359 break; 360 } 361 break; 362 } 363 return (error); 364 } 365 366 int 367 rip_bind(inp, nam) 368 struct inpcb *inp; 369 struct mbuf *nam; 370 { 371 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 372 373 if (nam->m_len != sizeof(*addr)) 374 return (EINVAL); 375 if (ifnet.tqh_first == 0) 376 return (EADDRNOTAVAIL); 377 if (addr->sin_family != AF_INET && 378 addr->sin_family != AF_IMPLINK) 379 return (EAFNOSUPPORT); 380 if (!in_nullhost(addr->sin_addr) && 381 ifa_ifwithaddr(sintosa(addr)) == 0) 382 return (EADDRNOTAVAIL); 383 inp->inp_laddr = addr->sin_addr; 384 return (0); 385 } 386 387 int 388 rip_connect(inp, nam) 389 struct inpcb *inp; 390 struct mbuf *nam; 391 { 392 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 393 394 if (nam->m_len != sizeof(*addr)) 395 return (EINVAL); 396 if (ifnet.tqh_first == 0) 397 return (EADDRNOTAVAIL); 398 if (addr->sin_family != AF_INET && 399 addr->sin_family != AF_IMPLINK) 400 return (EAFNOSUPPORT); 401 inp->inp_faddr = addr->sin_addr; 402 return (0); 403 } 404 405 void 406 rip_disconnect(inp) 407 struct inpcb *inp; 408 { 409 410 inp->inp_faddr = zeroin_addr; 411 } 412 413 u_long rip_sendspace = RIPSNDQ; 414 u_long rip_recvspace = RIPRCVQ; 415 416 /*ARGSUSED*/ 417 int 418 rip_usrreq(so, req, m, nam, control, p) 419 struct socket *so; 420 int req; 421 struct mbuf *m, *nam, *control; 422 struct proc *p; 423 { 424 struct inpcb *inp; 425 int s; 426 int error = 0; 427 #ifdef MROUTING 428 extern struct socket *ip_mrouter; 429 #endif 430 431 if (req == PRU_CONTROL) 432 return (in_control(so, (long)m, (caddr_t)nam, 433 (struct ifnet *)control, p)); 434 435 if (req == PRU_PURGEIF) { 436 in_purgeif((struct ifnet *)control); 437 in_pcbpurgeif(&rawcbtable, (struct ifnet *)control); 438 return (0); 439 } 440 441 s = splsoftnet(); 442 inp = sotoinpcb(so); 443 #ifdef DIAGNOSTIC 444 if (req != PRU_SEND && req != PRU_SENDOOB && control) 445 panic("rip_usrreq: unexpected control mbuf"); 446 #endif 447 if (inp == 0 && req != PRU_ATTACH) { 448 error = EINVAL; 449 goto release; 450 } 451 452 switch (req) { 453 454 case PRU_ATTACH: 455 if (inp != 0) { 456 error = EISCONN; 457 break; 458 } 459 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 460 error = EACCES; 461 break; 462 } 463 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 464 error = soreserve(so, rip_sendspace, rip_recvspace); 465 if (error) 466 break; 467 } 468 error = in_pcballoc(so, &rawcbtable); 469 if (error) 470 break; 471 inp = sotoinpcb(so); 472 inp->inp_ip.ip_p = (long)nam; 473 #ifdef IPSEC 474 error = ipsec_init_policy(so, &inp->inp_sp); 475 if (error != 0) { 476 in_pcbdetach(inp); 477 break; 478 } 479 #endif /*IPSEC*/ 480 break; 481 482 case PRU_DETACH: 483 #ifdef MROUTING 484 if (so == ip_mrouter) 485 ip_mrouter_done(); 486 #endif 487 in_pcbdetach(inp); 488 break; 489 490 case PRU_BIND: 491 error = rip_bind(inp, nam); 492 break; 493 494 case PRU_LISTEN: 495 error = EOPNOTSUPP; 496 break; 497 498 case PRU_CONNECT: 499 error = rip_connect(inp, nam); 500 if (error) 501 break; 502 soisconnected(so); 503 break; 504 505 case PRU_CONNECT2: 506 error = EOPNOTSUPP; 507 break; 508 509 case PRU_DISCONNECT: 510 soisdisconnected(so); 511 rip_disconnect(inp); 512 break; 513 514 /* 515 * Mark the connection as being incapable of further input. 516 */ 517 case PRU_SHUTDOWN: 518 socantsendmore(so); 519 break; 520 521 case PRU_RCVD: 522 error = EOPNOTSUPP; 523 break; 524 525 /* 526 * Ship a packet out. The appropriate raw output 527 * routine handles any massaging necessary. 528 */ 529 case PRU_SEND: 530 if (control && control->m_len) { 531 m_freem(control); 532 m_freem(m); 533 error = EINVAL; 534 break; 535 } 536 { 537 if (nam) { 538 if ((so->so_state & SS_ISCONNECTED) != 0) { 539 error = EISCONN; 540 goto die; 541 } 542 error = rip_connect(inp, nam); 543 if (error) { 544 die: 545 m_freem(m); 546 break; 547 } 548 } else { 549 if ((so->so_state & SS_ISCONNECTED) == 0) { 550 error = ENOTCONN; 551 goto die; 552 } 553 } 554 error = rip_output(m, inp); 555 if (nam) 556 rip_disconnect(inp); 557 } 558 break; 559 560 case PRU_SENSE: 561 /* 562 * stat: don't bother with a blocksize. 563 */ 564 splx(s); 565 return (0); 566 567 case PRU_RCVOOB: 568 error = EOPNOTSUPP; 569 break; 570 571 case PRU_SENDOOB: 572 m_freem(control); 573 m_freem(m); 574 error = EOPNOTSUPP; 575 break; 576 577 case PRU_SOCKADDR: 578 in_setsockaddr(inp, nam); 579 break; 580 581 case PRU_PEERADDR: 582 in_setpeeraddr(inp, nam); 583 break; 584 585 default: 586 panic("rip_usrreq"); 587 } 588 589 release: 590 splx(s); 591 return (error); 592 } 593
Indexes created Mon Sep 29 21:09:56 GMT 2025