raw_ip.c revision 1.42.6.3
1 /* $NetBSD: raw_ip.c,v 1.42.6.3 1999/11/30 13:35:34 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/in_pcb.h> 89 #include <netinet/in_var.h> 90 91 #include <machine/stdarg.h> 92 93 #ifdef IPSEC 94 #include <netinet6/ipsec.h> 95 #endif /*IPSEC*/ 96 97 struct inpcbtable rawcbtable; 98 99 int rip_bind __P((struct inpcb *, struct mbuf *)); 100 int rip_connect __P((struct inpcb *, struct mbuf *)); 101 void rip_disconnect __P((struct inpcb *)); 102 103 /* 104 * Nominal space allocated to a raw ip socket. 105 */ 106 #define RIPSNDQ 8192 107 #define RIPRCVQ 8192 108 109 /* 110 * Raw interface to IP protocol. 111 */ 112 113 /* 114 * Initialize raw connection block q. 115 */ 116 void 117 rip_init() 118 { 119 120 in_pcbinit(&rawcbtable, 1, 1); 121 } 122 123 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 124 125 /* 126 * Setup generic address and protocol structures 127 * for raw_input routine, then pass them along with 128 * mbuf chain. 129 */ 130 void 131 #if __STDC__ 132 rip_input(struct mbuf *m, ...) 133 #else 134 rip_input(m, va_alist) 135 struct mbuf *m; 136 va_dcl 137 #endif 138 { 139 int off, proto; 140 register struct ip *ip = mtod(m, struct ip *); 141 register struct inpcb *inp; 142 struct inpcb *last = 0; 143 struct mbuf *opts = 0; 144 struct sockaddr_in ripsrc; 145 va_list ap; 146 147 va_start(ap, m); 148 off = va_arg(ap, int); 149 proto = va_arg(ap, int); 150 va_end(ap); 151 152 ripsrc.sin_family = AF_INET; 153 ripsrc.sin_len = sizeof(struct sockaddr_in); 154 ripsrc.sin_addr = ip->ip_src; 155 ripsrc.sin_port = 0; 156 bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero)); 157 158 /* 159 * XXX Compatibility: programs using raw IP expect ip_len 160 * XXX to have the header length subtracted. 161 */ 162 ip->ip_len -= ip->ip_hl << 2; 163 164 for (inp = rawcbtable.inpt_queue.cqh_first; 165 inp != (struct inpcb *)&rawcbtable.inpt_queue; 166 inp = inp->inp_queue.cqe_next) { 167 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 168 continue; 169 if (!in_nullhost(inp->inp_laddr) && 170 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 171 continue; 172 if (!in_nullhost(inp->inp_faddr) && 173 !in_hosteq(inp->inp_faddr, ip->ip_src)) 174 continue; 175 if (last) { 176 struct mbuf *n; 177 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 178 if (last->inp_flags & INP_CONTROLOPTS || 179 last->inp_socket->so_options & SO_TIMESTAMP) 180 ip_savecontrol(last, &opts, ip, n); 181 if (sbappendaddr(&last->inp_socket->so_rcv, 182 sintosa(&ripsrc), n, opts) == 0) { 183 /* should notify about lost packet */ 184 m_freem(n); 185 if (opts) 186 m_freem(opts); 187 } else 188 sorwakeup(last->inp_socket); 189 opts = NULL; 190 } 191 } 192 last = inp; 193 } 194 if (last) { 195 if (last->inp_flags & INP_CONTROLOPTS || 196 last->inp_socket->so_options & SO_TIMESTAMP) 197 ip_savecontrol(last, &opts, ip, m); 198 if (sbappendaddr(&last->inp_socket->so_rcv, 199 sintosa(&ripsrc), m, opts) == 0) { 200 m_freem(m); 201 if (opts) 202 m_freem(opts); 203 } else 204 sorwakeup(last->inp_socket); 205 } else { 206 m_freem(m); 207 ipstat.ips_noproto++; 208 ipstat.ips_delivered--; 209 } 210 return; 211 } 212 213 /* 214 * Generate IP header and pass packet to ip_output. 215 * Tack on options user may have setup with control call. 216 */ 217 int 218 #if __STDC__ 219 rip_output(struct mbuf *m, ...) 220 #else 221 rip_output(m, va_alist) 222 struct mbuf *m; 223 va_dcl 224 #endif 225 { 226 register struct inpcb *inp; 227 register struct ip *ip; 228 struct mbuf *opts; 229 int flags; 230 va_list ap; 231 232 va_start(ap, m); 233 inp = va_arg(ap, struct inpcb *); 234 va_end(ap); 235 236 flags = 237 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST 238 | IP_RETURNMTU; 239 240 /* 241 * If the user handed us a complete IP packet, use it. 242 * Otherwise, allocate an mbuf for a header and fill it in. 243 */ 244 if ((inp->inp_flags & INP_HDRINCL) == 0) { 245 if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) { 246 m_freem(m); 247 return (EMSGSIZE); 248 } 249 M_PREPEND(m, sizeof(struct ip), M_WAIT); 250 ip = mtod(m, struct ip *); 251 ip->ip_tos = 0; 252 ip->ip_off = 0; 253 ip->ip_p = inp->inp_ip.ip_p; 254 ip->ip_len = m->m_pkthdr.len; 255 ip->ip_src = inp->inp_laddr; 256 ip->ip_dst = inp->inp_faddr; 257 ip->ip_ttl = MAXTTL; 258 opts = inp->inp_options; 259 } else { 260 if (m->m_pkthdr.len > IP_MAXPACKET) { 261 m_freem(m); 262 return (EMSGSIZE); 263 } 264 ip = mtod(m, struct ip *); 265 if (m->m_pkthdr.len != ip->ip_len) { 266 m_freem(m); 267 return (EINVAL); 268 } 269 if (ip->ip_id == 0) 270 ip->ip_id = htons(ip_id++); 271 opts = NULL; 272 /* XXX prevent ip_output from overwriting header fields */ 273 flags |= IP_RAWOUTPUT; 274 ipstat.ips_rawout++; 275 } 276 #ifdef IPSEC 277 m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket; /*XXX*/ 278 #endif /*IPSEC*/ 279 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu)); 280 } 281 282 /* 283 * Raw IP socket option processing. 284 */ 285 int 286 rip_ctloutput(op, so, level, optname, m) 287 int op; 288 struct socket *so; 289 int level, optname; 290 struct mbuf **m; 291 { 292 register struct inpcb *inp = sotoinpcb(so); 293 int error = 0; 294 295 if (level != IPPROTO_IP) { 296 error = ENOPROTOOPT; 297 if (op == PRCO_SETOPT && *m != 0) 298 (void) m_free(*m); 299 } else switch (op) { 300 301 case PRCO_SETOPT: 302 switch (optname) { 303 case IP_HDRINCL: 304 if (*m == 0 || (*m)->m_len < sizeof (int)) 305 error = EINVAL; 306 else { 307 if (*mtod(*m, int *)) 308 inp->inp_flags |= INP_HDRINCL; 309 else 310 inp->inp_flags &= ~INP_HDRINCL; 311 } 312 if (*m != 0) 313 (void) m_free(*m); 314 break; 315 316 #ifdef MROUTING 317 case MRT_INIT: 318 case MRT_DONE: 319 case MRT_ADD_VIF: 320 case MRT_DEL_VIF: 321 case MRT_ADD_MFC: 322 case MRT_DEL_MFC: 323 case MRT_ASSERT: 324 error = ip_mrouter_set(so, optname, m); 325 break; 326 #endif 327 328 default: 329 error = ip_ctloutput(op, so, level, optname, m); 330 break; 331 } 332 break; 333 334 case PRCO_GETOPT: 335 switch (optname) { 336 case IP_HDRINCL: 337 *m = m_get(M_WAIT, M_SOOPTS); 338 (*m)->m_len = sizeof (int); 339 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 340 break; 341 342 #ifdef MROUTING 343 case MRT_VERSION: 344 case MRT_ASSERT: 345 error = ip_mrouter_get(so, optname, m); 346 break; 347 #endif 348 349 default: 350 error = ip_ctloutput(op, so, level, optname, m); 351 break; 352 } 353 break; 354 } 355 return (error); 356 } 357 358 int 359 rip_bind(inp, nam) 360 struct inpcb *inp; 361 struct mbuf *nam; 362 { 363 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 364 365 if (nam->m_len != sizeof(*addr)) 366 return (EINVAL); 367 if (ifnet.tqh_first == 0) 368 return (EADDRNOTAVAIL); 369 if (addr->sin_family != AF_INET && 370 addr->sin_family != AF_IMPLINK) 371 return (EAFNOSUPPORT); 372 if (!in_nullhost(addr->sin_addr) && 373 ifa_ifwithaddr(sintosa(addr)) == 0) 374 return (EADDRNOTAVAIL); 375 inp->inp_laddr = addr->sin_addr; 376 return (0); 377 } 378 379 int 380 rip_connect(inp, nam) 381 struct inpcb *inp; 382 struct mbuf *nam; 383 { 384 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 385 386 if (nam->m_len != sizeof(*addr)) 387 return (EINVAL); 388 if (ifnet.tqh_first == 0) 389 return (EADDRNOTAVAIL); 390 if (addr->sin_family != AF_INET && 391 addr->sin_family != AF_IMPLINK) 392 return (EAFNOSUPPORT); 393 inp->inp_faddr = addr->sin_addr; 394 return (0); 395 } 396 397 void 398 rip_disconnect(inp) 399 struct inpcb *inp; 400 { 401 402 inp->inp_faddr = zeroin_addr; 403 } 404 405 u_long rip_sendspace = RIPSNDQ; 406 u_long rip_recvspace = RIPRCVQ; 407 408 /*ARGSUSED*/ 409 int 410 rip_usrreq(so, req, m, nam, control, p) 411 register struct socket *so; 412 int req; 413 struct mbuf *m, *nam, *control; 414 struct proc *p; 415 { 416 register struct inpcb *inp; 417 int s; 418 register int error = 0; 419 #ifdef MROUTING 420 extern struct socket *ip_mrouter; 421 #endif 422 423 if (req == PRU_CONTROL) 424 return (in_control(so, (long)m, (caddr_t)nam, 425 (struct ifnet *)control, p)); 426 427 s = splsoftnet(); 428 inp = sotoinpcb(so); 429 #ifdef DIAGNOSTIC 430 if (req != PRU_SEND && req != PRU_SENDOOB && control) 431 panic("rip_usrreq: unexpected control mbuf"); 432 #endif 433 if (inp == 0 && req != PRU_ATTACH) { 434 error = EINVAL; 435 goto release; 436 } 437 438 switch (req) { 439 440 case PRU_ATTACH: 441 if (inp != 0) { 442 error = EISCONN; 443 break; 444 } 445 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 446 error = EACCES; 447 break; 448 } 449 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 450 error = soreserve(so, rip_sendspace, rip_recvspace); 451 if (error) 452 break; 453 } 454 error = in_pcballoc(so, &rawcbtable); 455 if (error) 456 break; 457 inp = sotoinpcb(so); 458 inp->inp_ip.ip_p = (long)nam; 459 #ifdef IPSEC 460 error = ipsec_init_policy(so, &inp->inp_sp); 461 if (error != 0) { 462 in_pcbdetach(inp); 463 break; 464 } 465 #endif /*IPSEC*/ 466 break; 467 468 case PRU_DETACH: 469 #ifdef MROUTING 470 if (so == ip_mrouter) 471 ip_mrouter_done(); 472 #endif 473 in_pcbdetach(inp); 474 break; 475 476 case PRU_BIND: 477 error = rip_bind(inp, nam); 478 break; 479 480 case PRU_LISTEN: 481 error = EOPNOTSUPP; 482 break; 483 484 case PRU_CONNECT: 485 error = rip_connect(inp, nam); 486 if (error) 487 break; 488 soisconnected(so); 489 break; 490 491 case PRU_CONNECT2: 492 error = EOPNOTSUPP; 493 break; 494 495 case PRU_DISCONNECT: 496 soisdisconnected(so); 497 rip_disconnect(inp); 498 break; 499 500 /* 501 * Mark the connection as being incapable of further input. 502 */ 503 case PRU_SHUTDOWN: 504 socantsendmore(so); 505 break; 506 507 case PRU_RCVD: 508 error = EOPNOTSUPP; 509 break; 510 511 /* 512 * Ship a packet out. The appropriate raw output 513 * routine handles any massaging necessary. 514 */ 515 case PRU_SEND: 516 if (control && control->m_len) { 517 m_freem(control); 518 m_freem(m); 519 error = EINVAL; 520 break; 521 } 522 { 523 if (nam) { 524 if ((so->so_state & SS_ISCONNECTED) != 0) { 525 error = EISCONN; 526 goto die; 527 } 528 error = rip_connect(inp, nam); 529 if (error) { 530 die: 531 m_freem(m); 532 break; 533 } 534 } else { 535 if ((so->so_state & SS_ISCONNECTED) == 0) { 536 error = ENOTCONN; 537 goto die; 538 } 539 } 540 error = rip_output(m, inp); 541 if (nam) 542 rip_disconnect(inp); 543 } 544 break; 545 546 case PRU_SENSE: 547 /* 548 * stat: don't bother with a blocksize. 549 */ 550 splx(s); 551 return (0); 552 553 case PRU_RCVOOB: 554 error = EOPNOTSUPP; 555 break; 556 557 case PRU_SENDOOB: 558 m_freem(control); 559 m_freem(m); 560 error = EOPNOTSUPP; 561 break; 562 563 case PRU_SOCKADDR: 564 in_setsockaddr(inp, nam); 565 break; 566 567 case PRU_PEERADDR: 568 in_setpeeraddr(inp, nam); 569 break; 570 571 default: 572 panic("rip_usrreq"); 573 } 574 575 release: 576 splx(s); 577 return (error); 578 } 579
Indexes created Mon Sep 29 21:09:56 GMT 2025