raw_ip.c revision 1.42.6.2
1 /* $NetBSD: raw_ip.c,v 1.42.6.2 1999/07/06 11:02:47 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_mrouting.h" 68 69 #include <sys/param.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/socket.h> 73 #include <sys/protosw.h> 74 #include <sys/socketvar.h> 75 #include <sys/errno.h> 76 #include <sys/systm.h> 77 #include <sys/proc.h> 78 79 #include <net/if.h> 80 #include <net/route.h> 81 82 #include <netinet/in.h> 83 #include <netinet/in_systm.h> 84 #include <netinet/ip.h> 85 #include <netinet/ip_var.h> 86 #include <netinet/ip_mroute.h> 87 #include <netinet/in_pcb.h> 88 #include <netinet/in_var.h> 89 90 #include <machine/stdarg.h> 91 92 #ifdef IPSEC 93 #include <netinet6/ipsec.h> 94 #endif /*IPSEC*/ 95 96 struct inpcbtable rawcbtable; 97 98 int rip_bind __P((struct inpcb *, struct mbuf *)); 99 int rip_connect __P((struct inpcb *, struct mbuf *)); 100 void rip_disconnect __P((struct inpcb *)); 101 102 /* 103 * Nominal space allocated to a raw ip socket. 104 */ 105 #define RIPSNDQ 8192 106 #define RIPRCVQ 8192 107 108 /* 109 * Raw interface to IP protocol. 110 */ 111 112 /* 113 * Initialize raw connection block q. 114 */ 115 void 116 rip_init() 117 { 118 119 in_pcbinit(&rawcbtable, 1, 1); 120 } 121 122 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 123 124 /* 125 * Setup generic address and protocol structures 126 * for raw_input routine, then pass them along with 127 * mbuf chain. 128 */ 129 void 130 #if __STDC__ 131 rip_input(struct mbuf *m, ...) 132 #else 133 rip_input(m, va_alist) 134 struct mbuf *m; 135 va_dcl 136 #endif 137 { 138 int off, proto; 139 register struct ip *ip = mtod(m, struct ip *); 140 register struct inpcb *inp; 141 struct inpcb *last = 0; 142 struct mbuf *opts = 0; 143 struct sockaddr_in ripsrc; 144 va_list ap; 145 146 va_start(ap, m); 147 off = va_arg(ap, int); 148 proto = va_arg(ap, int); 149 va_end(ap); 150 151 ripsrc.sin_family = AF_INET; 152 ripsrc.sin_len = sizeof(struct sockaddr_in); 153 ripsrc.sin_addr = ip->ip_src; 154 ripsrc.sin_port = 0; 155 bzero((caddr_t)ripsrc.sin_zero, sizeof(ripsrc.sin_zero)); 156 157 /* 158 * XXX Compatibility: programs using raw IP expect ip_len 159 * XXX to have the header length subtracted. 160 */ 161 ip->ip_len -= ip->ip_hl << 2; 162 163 for (inp = rawcbtable.inpt_queue.cqh_first; 164 inp != (struct inpcb *)&rawcbtable.inpt_queue; 165 inp = inp->inp_queue.cqe_next) { 166 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != proto) 167 continue; 168 if (!in_nullhost(inp->inp_laddr) && 169 !in_hosteq(inp->inp_laddr, ip->ip_dst)) 170 continue; 171 if (!in_nullhost(inp->inp_faddr) && 172 !in_hosteq(inp->inp_faddr, ip->ip_src)) 173 continue; 174 if (last) { 175 struct mbuf *n; 176 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 177 if (last->inp_flags & INP_CONTROLOPTS || 178 last->inp_socket->so_options & SO_TIMESTAMP) 179 ip_savecontrol(last, &opts, ip, n); 180 if (sbappendaddr(&last->inp_socket->so_rcv, 181 sintosa(&ripsrc), n, opts) == 0) { 182 /* should notify about lost packet */ 183 m_freem(n); 184 if (opts) 185 m_freem(opts); 186 } else 187 sorwakeup(last->inp_socket); 188 opts = NULL; 189 } 190 } 191 last = inp; 192 } 193 if (last) { 194 if (last->inp_flags & INP_CONTROLOPTS || 195 last->inp_socket->so_options & SO_TIMESTAMP) 196 ip_savecontrol(last, &opts, ip, m); 197 if (sbappendaddr(&last->inp_socket->so_rcv, 198 sintosa(&ripsrc), m, opts) == 0) { 199 m_freem(m); 200 if (opts) 201 m_freem(opts); 202 } else 203 sorwakeup(last->inp_socket); 204 } else { 205 m_freem(m); 206 ipstat.ips_noproto++; 207 ipstat.ips_delivered--; 208 } 209 return; 210 } 211 212 /* 213 * Generate IP header and pass packet to ip_output. 214 * Tack on options user may have setup with control call. 215 */ 216 int 217 #if __STDC__ 218 rip_output(struct mbuf *m, ...) 219 #else 220 rip_output(m, va_alist) 221 struct mbuf *m; 222 va_dcl 223 #endif 224 { 225 register struct inpcb *inp; 226 register struct ip *ip; 227 struct mbuf *opts; 228 int flags; 229 va_list ap; 230 231 va_start(ap, m); 232 inp = va_arg(ap, struct inpcb *); 233 va_end(ap); 234 235 flags = 236 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST 237 | IP_RETURNMTU; 238 239 /* 240 * If the user handed us a complete IP packet, use it. 241 * Otherwise, allocate an mbuf for a header and fill it in. 242 */ 243 if ((inp->inp_flags & INP_HDRINCL) == 0) { 244 if ((m->m_pkthdr.len + sizeof(struct ip)) > IP_MAXPACKET) { 245 m_freem(m); 246 return (EMSGSIZE); 247 } 248 M_PREPEND(m, sizeof(struct ip), M_WAIT); 249 ip = mtod(m, struct ip *); 250 ip->ip_tos = 0; 251 ip->ip_off = 0; 252 ip->ip_p = inp->inp_ip.ip_p; 253 ip->ip_len = m->m_pkthdr.len; 254 ip->ip_src = inp->inp_laddr; 255 ip->ip_dst = inp->inp_faddr; 256 ip->ip_ttl = MAXTTL; 257 opts = inp->inp_options; 258 } else { 259 if (m->m_pkthdr.len > IP_MAXPACKET) { 260 m_freem(m); 261 return (EMSGSIZE); 262 } 263 ip = mtod(m, struct ip *); 264 if (m->m_pkthdr.len != ip->ip_len) { 265 m_freem(m); 266 return (EINVAL); 267 } 268 if (ip->ip_id == 0) 269 ip->ip_id = htons(ip_id++); 270 opts = NULL; 271 /* XXX prevent ip_output from overwriting header fields */ 272 flags |= IP_RAWOUTPUT; 273 ipstat.ips_rawout++; 274 } 275 #ifdef IPSEC 276 m->m_pkthdr.rcvif = (struct ifnet *)inp->inp_socket; /*XXX*/ 277 #endif /*IPSEC*/ 278 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions, &inp->inp_errormtu)); 279 } 280 281 /* 282 * Raw IP socket option processing. 283 */ 284 int 285 rip_ctloutput(op, so, level, optname, m) 286 int op; 287 struct socket *so; 288 int level, optname; 289 struct mbuf **m; 290 { 291 register struct inpcb *inp = sotoinpcb(so); 292 int error = 0; 293 294 if (level != IPPROTO_IP) { 295 error = ENOPROTOOPT; 296 if (op == PRCO_SETOPT && *m != 0) 297 (void) m_free(*m); 298 } else switch (op) { 299 300 case PRCO_SETOPT: 301 switch (optname) { 302 case IP_HDRINCL: 303 if (*m == 0 || (*m)->m_len < sizeof (int)) 304 error = EINVAL; 305 else { 306 if (*mtod(*m, int *)) 307 inp->inp_flags |= INP_HDRINCL; 308 else 309 inp->inp_flags &= ~INP_HDRINCL; 310 } 311 if (*m != 0) 312 (void) m_free(*m); 313 break; 314 315 #ifdef MROUTING 316 case MRT_INIT: 317 case MRT_DONE: 318 case MRT_ADD_VIF: 319 case MRT_DEL_VIF: 320 case MRT_ADD_MFC: 321 case MRT_DEL_MFC: 322 case MRT_ASSERT: 323 error = ip_mrouter_set(so, optname, m); 324 break; 325 #endif 326 327 default: 328 error = ip_ctloutput(op, so, level, optname, m); 329 break; 330 } 331 break; 332 333 case PRCO_GETOPT: 334 switch (optname) { 335 case IP_HDRINCL: 336 *m = m_get(M_WAIT, M_SOOPTS); 337 (*m)->m_len = sizeof (int); 338 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 339 break; 340 341 #ifdef MROUTING 342 case MRT_VERSION: 343 case MRT_ASSERT: 344 error = ip_mrouter_get(so, optname, m); 345 break; 346 #endif 347 348 default: 349 error = ip_ctloutput(op, so, level, optname, m); 350 break; 351 } 352 break; 353 } 354 return (error); 355 } 356 357 int 358 rip_bind(inp, nam) 359 struct inpcb *inp; 360 struct mbuf *nam; 361 { 362 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 363 364 if (nam->m_len != sizeof(*addr)) 365 return (EINVAL); 366 if (ifnet.tqh_first == 0) 367 return (EADDRNOTAVAIL); 368 if (addr->sin_family != AF_INET && 369 addr->sin_family != AF_IMPLINK) 370 return (EAFNOSUPPORT); 371 if (!in_nullhost(addr->sin_addr) && 372 ifa_ifwithaddr(sintosa(addr)) == 0) 373 return (EADDRNOTAVAIL); 374 inp->inp_laddr = addr->sin_addr; 375 return (0); 376 } 377 378 int 379 rip_connect(inp, nam) 380 struct inpcb *inp; 381 struct mbuf *nam; 382 { 383 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 384 385 if (nam->m_len != sizeof(*addr)) 386 return (EINVAL); 387 if (ifnet.tqh_first == 0) 388 return (EADDRNOTAVAIL); 389 if (addr->sin_family != AF_INET && 390 addr->sin_family != AF_IMPLINK) 391 return (EAFNOSUPPORT); 392 inp->inp_faddr = addr->sin_addr; 393 return (0); 394 } 395 396 void 397 rip_disconnect(inp) 398 struct inpcb *inp; 399 { 400 401 inp->inp_faddr = zeroin_addr; 402 } 403 404 u_long rip_sendspace = RIPSNDQ; 405 u_long rip_recvspace = RIPRCVQ; 406 407 /*ARGSUSED*/ 408 int 409 rip_usrreq(so, req, m, nam, control, p) 410 register struct socket *so; 411 int req; 412 struct mbuf *m, *nam, *control; 413 struct proc *p; 414 { 415 register struct inpcb *inp; 416 int s; 417 register int error = 0; 418 #ifdef MROUTING 419 extern struct socket *ip_mrouter; 420 #endif 421 422 if (req == PRU_CONTROL) 423 return (in_control(so, (long)m, (caddr_t)nam, 424 (struct ifnet *)control, p)); 425 426 s = splsoftnet(); 427 inp = sotoinpcb(so); 428 #ifdef DIAGNOSTIC 429 if (req != PRU_SEND && req != PRU_SENDOOB && control) 430 panic("rip_usrreq: unexpected control mbuf"); 431 #endif 432 if (inp == 0 && req != PRU_ATTACH) { 433 error = EINVAL; 434 goto release; 435 } 436 437 switch (req) { 438 439 case PRU_ATTACH: 440 if (inp != 0) { 441 error = EISCONN; 442 break; 443 } 444 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 445 error = EACCES; 446 break; 447 } 448 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 449 error = soreserve(so, rip_sendspace, rip_recvspace); 450 if (error) 451 break; 452 } 453 error = in_pcballoc(so, &rawcbtable); 454 if (error) 455 break; 456 inp = sotoinpcb(so); 457 inp->inp_ip.ip_p = (long)nam; 458 #ifdef IPSEC 459 error = ipsec_init_policy(&inp->inp_sp); 460 #endif /*IPSEC*/ 461 break; 462 463 case PRU_DETACH: 464 #ifdef MROUTING 465 if (so == ip_mrouter) 466 ip_mrouter_done(); 467 #endif 468 in_pcbdetach(inp); 469 break; 470 471 case PRU_BIND: 472 error = rip_bind(inp, nam); 473 break; 474 475 case PRU_LISTEN: 476 error = EOPNOTSUPP; 477 break; 478 479 case PRU_CONNECT: 480 error = rip_connect(inp, nam); 481 if (error) 482 break; 483 soisconnected(so); 484 break; 485 486 case PRU_CONNECT2: 487 error = EOPNOTSUPP; 488 break; 489 490 case PRU_DISCONNECT: 491 soisdisconnected(so); 492 rip_disconnect(inp); 493 break; 494 495 /* 496 * Mark the connection as being incapable of further input. 497 */ 498 case PRU_SHUTDOWN: 499 socantsendmore(so); 500 break; 501 502 case PRU_RCVD: 503 error = EOPNOTSUPP; 504 break; 505 506 /* 507 * Ship a packet out. The appropriate raw output 508 * routine handles any massaging necessary. 509 */ 510 case PRU_SEND: 511 if (control && control->m_len) { 512 m_freem(control); 513 m_freem(m); 514 error = EINVAL; 515 break; 516 } 517 { 518 if (nam) { 519 if ((so->so_state & SS_ISCONNECTED) != 0) { 520 error = EISCONN; 521 goto die; 522 } 523 error = rip_connect(inp, nam); 524 if (error) { 525 die: 526 m_freem(m); 527 break; 528 } 529 } else { 530 if ((so->so_state & SS_ISCONNECTED) == 0) { 531 error = ENOTCONN; 532 goto die; 533 } 534 } 535 error = rip_output(m, inp); 536 if (nam) 537 rip_disconnect(inp); 538 } 539 break; 540 541 case PRU_SENSE: 542 /* 543 * stat: don't bother with a blocksize. 544 */ 545 splx(s); 546 return (0); 547 548 case PRU_RCVOOB: 549 error = EOPNOTSUPP; 550 break; 551 552 case PRU_SENDOOB: 553 m_freem(control); 554 m_freem(m); 555 error = EOPNOTSUPP; 556 break; 557 558 case PRU_SOCKADDR: 559 in_setsockaddr(inp, nam); 560 break; 561 562 case PRU_PEERADDR: 563 in_setpeeraddr(inp, nam); 564 break; 565 566 default: 567 panic("rip_usrreq"); 568 } 569 570 release: 571 splx(s); 572 return (error); 573 } 574
Indexes created Mon Sep 29 21:09:56 GMT 2025