1 /* 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 34 * $Id: raw_ip.c,v 1.41 1997/02/13 19:46:45 wollman Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/errno.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/protosw.h> 44 #include <sys/queue.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 #include <sys/sysctl.h> 48 49 #include <net/if.h> 50 #include <net/route.h> 51 52 #define _IP_VHL 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/in_pcb.h> 57 #include <netinet/in_var.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/ip_mroute.h> 60 61 #include <netinet/ip_fw.h> 62 63 #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 64 #undef COMPAT_IPFW 65 #define COMPAT_IPFW 1 66 #else 67 #undef COMPAT_IPFW 68 #endif 69 70 static struct inpcbhead ripcb; 71 static struct inpcbinfo ripcbinfo; 72 73 /* 74 * Nominal space allocated to a raw ip socket. 75 */ 76 #define RIPSNDQ 8192 77 #define RIPRCVQ 8192 78 79 /* 80 * Raw interface to IP protocol. 81 */ 82 83 /* 84 * Initialize raw connection block q. 85 */ 86 void 87 rip_init() 88 { 89 LIST_INIT(&ripcb); 90 ripcbinfo.listhead = &ripcb; 91 /* 92 * XXX We don't use the hash list for raw IP, but it's easier 93 * to allocate a one entry hash list than it is to check all 94 * over the place for hashbase == NULL. 95 */ 96 ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize); 97 } 98 99 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 100 /* 101 * Setup generic address and protocol structures 102 * for raw_input routine, then pass them along with 103 * mbuf chain. 104 */ 105 void 106 rip_input(m, iphlen) 107 struct mbuf *m; 108 int iphlen; 109 { 110 register struct ip *ip = mtod(m, struct ip *); 111 register struct inpcb *inp; 112 struct inpcb *last = 0; 113 struct mbuf *opts = 0; 114 115 ripsrc.sin_addr = ip->ip_src; 116 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 117 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 118 continue; 119 if (inp->inp_laddr.s_addr && 120 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 121 continue; 122 if (inp->inp_faddr.s_addr && 123 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 124 continue; 125 if (last) { 126 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 127 if (n) { 128 if (last->inp_flags & INP_CONTROLOPTS || 129 last->inp_socket->so_options & SO_TIMESTAMP) 130 ip_savecontrol(last, &opts, ip, n); 131 if (sbappendaddr(&last->inp_socket->so_rcv, 132 (struct sockaddr *)&ripsrc, n, 133 opts) == 0) { 134 /* should notify about lost packet */ 135 m_freem(n); 136 if (opts) 137 m_freem(opts); 138 } else 139 sorwakeup(last->inp_socket); 140 opts = 0; 141 } 142 } 143 last = inp; 144 } 145 if (last) { 146 if (last->inp_flags & INP_CONTROLOPTS || 147 last->inp_socket->so_options & SO_TIMESTAMP) 148 ip_savecontrol(last, &opts, ip, m); 149 if (sbappendaddr(&last->inp_socket->so_rcv, 150 (struct sockaddr *)&ripsrc, m, opts) == 0) { 151 m_freem(m); 152 if (opts) 153 m_freem(opts); 154 } else 155 sorwakeup(last->inp_socket); 156 } else { 157 m_freem(m); 158 ipstat.ips_noproto++; 159 ipstat.ips_delivered--; 160 } 161 } 162 163 /* 164 * Generate IP header and pass packet to ip_output. 165 * Tack on options user may have setup with control call. 166 */ 167 int 168 rip_output(m, so, dst) 169 register struct mbuf *m; 170 struct socket *so; 171 u_long dst; 172 { 173 register struct ip *ip; 174 register struct inpcb *inp = sotoinpcb(so); 175 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 176 177 /* 178 * If the user handed us a complete IP packet, use it. 179 * Otherwise, allocate an mbuf for a header and fill it in. 180 */ 181 if ((inp->inp_flags & INP_HDRINCL) == 0) { 182 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 183 m_freem(m); 184 return(EMSGSIZE); 185 } 186 M_PREPEND(m, sizeof(struct ip), M_WAIT); 187 ip = mtod(m, struct ip *); 188 ip->ip_tos = 0; 189 ip->ip_off = 0; 190 ip->ip_p = inp->inp_ip.ip_p; 191 ip->ip_len = m->m_pkthdr.len; 192 ip->ip_src = inp->inp_laddr; 193 ip->ip_dst.s_addr = dst; 194 ip->ip_ttl = MAXTTL; 195 } else { 196 if (m->m_pkthdr.len > IP_MAXPACKET) { 197 m_freem(m); 198 return(EMSGSIZE); 199 } 200 ip = mtod(m, struct ip *); 201 /* don't allow both user specified and setsockopt options, 202 and don't allow packet length sizes that will crash */ 203 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 204 && inp->inp_options) 205 || (ip->ip_len > m->m_pkthdr.len)) { 206 m_freem(m); 207 return EINVAL; 208 } 209 if (ip->ip_id == 0) 210 ip->ip_id = htons(ip_id++); 211 /* XXX prevent ip_output from overwriting header fields */ 212 flags |= IP_RAWOUTPUT; 213 ipstat.ips_rawout++; 214 } 215 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 216 inp->inp_moptions)); 217 } 218 219 /* 220 * Raw IP socket option processing. 221 */ 222 int 223 rip_ctloutput(op, so, level, optname, m) 224 int op; 225 struct socket *so; 226 int level, optname; 227 struct mbuf **m; 228 { 229 register struct inpcb *inp = sotoinpcb(so); 230 register int error; 231 232 if (level != IPPROTO_IP) { 233 if (op == PRCO_SETOPT && *m) 234 (void)m_free(*m); 235 return (EINVAL); 236 } 237 238 switch (optname) { 239 240 case IP_HDRINCL: 241 error = 0; 242 if (op == PRCO_SETOPT) { 243 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 244 error = EINVAL; 245 else if (*mtod(*m, int *)) 246 inp->inp_flags |= INP_HDRINCL; 247 else 248 inp->inp_flags &= ~INP_HDRINCL; 249 if (*m) 250 (void)m_free(*m); 251 } else { 252 *m = m_get(M_WAIT, MT_SOOPTS); 253 (*m)->m_len = sizeof (int); 254 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 255 } 256 return (error); 257 258 #ifdef COMPAT_IPFW 259 case IP_FW_GET: 260 if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { 261 if (*m) (void)m_free(*m); 262 return(EINVAL); 263 } 264 return (*ip_fw_ctl_ptr)(optname, m); 265 266 case IP_FW_ADD: 267 case IP_FW_DEL: 268 case IP_FW_FLUSH: 269 case IP_FW_ZERO: 270 if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { 271 if (*m) (void)m_free(*m); 272 return(EINVAL); 273 } 274 return (*ip_fw_ctl_ptr)(optname, m); 275 276 case IP_NAT: 277 if (ip_nat_ctl_ptr == NULL) { 278 if (*m) (void)m_free(*m); 279 return(EINVAL); 280 } 281 return (*ip_nat_ctl_ptr)(op, m); 282 283 #endif 284 case IP_RSVP_ON: 285 return ip_rsvp_init(so); 286 break; 287 288 case IP_RSVP_OFF: 289 return ip_rsvp_done(); 290 break; 291 292 case IP_RSVP_VIF_ON: 293 return ip_rsvp_vif_init(so, *m); 294 295 case IP_RSVP_VIF_OFF: 296 return ip_rsvp_vif_done(so, *m); 297 298 case MRT_INIT: 299 case MRT_DONE: 300 case MRT_ADD_VIF: 301 case MRT_DEL_VIF: 302 case MRT_ADD_MFC: 303 case MRT_DEL_MFC: 304 case MRT_VERSION: 305 case MRT_ASSERT: 306 if (op == PRCO_SETOPT) { 307 error = ip_mrouter_set(optname, so, *m); 308 if (*m) 309 (void)m_free(*m); 310 } else if (op == PRCO_GETOPT) { 311 error = ip_mrouter_get(optname, so, m); 312 } else 313 error = EINVAL; 314 return (error); 315 } 316 return (ip_ctloutput(op, so, level, optname, m)); 317 } 318 319 /* 320 * This function exists solely to receive the PRC_IFDOWN messages which 321 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, 322 * and calls in_ifadown() to remove all routes corresponding to that address. 323 * It also receives the PRC_IFUP messages from if_up() and reinstalls the 324 * interface routes. 325 */ 326 void 327 rip_ctlinput(cmd, sa, vip) 328 int cmd; 329 struct sockaddr *sa; 330 void *vip; 331 { 332 struct in_ifaddr *ia; 333 struct ifnet *ifp; 334 int err; 335 int flags; 336 337 switch(cmd) { 338 case PRC_IFDOWN: 339 for (ia = in_ifaddrhead.tqh_first; ia; 340 ia = ia->ia_link.tqe_next) { 341 if (ia->ia_ifa.ifa_addr == sa 342 && (ia->ia_flags & IFA_ROUTE)) { 343 /* 344 * in_ifscrub kills the interface route. 345 */ 346 in_ifscrub(ia->ia_ifp, ia); 347 /* 348 * in_ifadown gets rid of all the rest of 349 * the routes. This is not quite the right 350 * thing to do, but at least if we are running 351 * a routing process they will come back. 352 */ 353 in_ifadown(&ia->ia_ifa); 354 break; 355 } 356 } 357 break; 358 359 case PRC_IFUP: 360 for (ia = in_ifaddrhead.tqh_first; ia; 361 ia = ia->ia_link.tqe_next) { 362 if (ia->ia_ifa.ifa_addr == sa) 363 break; 364 } 365 if (ia == 0 || (ia->ia_flags & IFA_ROUTE)) 366 return; 367 flags = RTF_UP; 368 ifp = ia->ia_ifa.ifa_ifp; 369 370 if ((ifp->if_flags & IFF_LOOPBACK) 371 || (ifp->if_flags & IFF_POINTOPOINT)) 372 flags |= RTF_HOST; 373 374 err = rtinit(&ia->ia_ifa, RTM_ADD, flags); 375 if (err == 0) 376 ia->ia_flags |= IFA_ROUTE; 377 break; 378 } 379 } 380 381 static u_long rip_sendspace = RIPSNDQ; 382 static u_long rip_recvspace = RIPRCVQ; 383 384 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, &rip_sendspace, 385 0, ""); 386 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, &rip_recvspace, 387 0, ""); 388 389 static int 390 rip_attach(struct socket *so, int proto) 391 { 392 struct inpcb *inp; 393 int error; 394 395 inp = sotoinpcb(so); 396 if (inp) 397 panic("rip_attach"); 398 if ((so->so_state & SS_PRIV) == 0) 399 return EACCES; 400 401 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 402 (error = in_pcballoc(so, &ripcbinfo))) 403 return error; 404 inp = (struct inpcb *)so->so_pcb; 405 inp->inp_ip.ip_p = proto; 406 return 0; 407 } 408 409 static int 410 rip_detach(struct socket *so) 411 { 412 struct inpcb *inp; 413 414 inp = sotoinpcb(so); 415 if (inp == 0) 416 panic("rip_detach"); 417 if (so == ip_mrouter) 418 ip_mrouter_done(); 419 ip_rsvp_force_done(so); 420 if (so == ip_rsvpd) 421 ip_rsvp_done(); 422 in_pcbdetach(inp); 423 return 0; 424 } 425 426 static int 427 rip_abort(struct socket *so) 428 { 429 soisdisconnected(so); 430 return rip_detach(so); 431 } 432 433 static int 434 rip_disconnect(struct socket *so) 435 { 436 if ((so->so_state & SS_ISCONNECTED) == 0) 437 return ENOTCONN; 438 return rip_abort(so); 439 } 440 441 static int 442 rip_bind(struct socket *so, struct mbuf *nam) 443 { 444 struct inpcb *inp = sotoinpcb(so); 445 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 446 447 if (nam->m_len != sizeof(*addr)) 448 return EINVAL; 449 450 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) && 451 (addr->sin_family != AF_IMPLINK)) || 452 (addr->sin_addr.s_addr && 453 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) 454 return EADDRNOTAVAIL; 455 inp->inp_laddr = addr->sin_addr; 456 return 0; 457 } 458 459 static int 460 rip_connect(struct socket *so, struct mbuf *nam) 461 { 462 struct inpcb *inp = sotoinpcb(so); 463 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 464 465 if (nam->m_len != sizeof(*addr)) 466 return EINVAL; 467 if (TAILQ_EMPTY(&ifnet)) 468 return EADDRNOTAVAIL; 469 if ((addr->sin_family != AF_INET) && 470 (addr->sin_family != AF_IMPLINK)) 471 return EAFNOSUPPORT; 472 inp->inp_faddr = addr->sin_addr; 473 soisconnected(so); 474 return 0; 475 } 476 477 static int 478 rip_shutdown(struct socket *so) 479 { 480 socantsendmore(so); 481 return 0; 482 } 483 484 static int 485 rip_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam, 486 struct mbuf *control) 487 { 488 struct inpcb *inp = sotoinpcb(so); 489 register u_long dst; 490 491 if (so->so_state & SS_ISCONNECTED) { 492 if (nam) { 493 m_freem(m); 494 return EISCONN; 495 } 496 dst = inp->inp_faddr.s_addr; 497 } else { 498 if (nam == NULL) { 499 m_freem(m); 500 return ENOTCONN; 501 } 502 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 503 } 504 return rip_output(m, so, dst); 505 } 506 507 struct pr_usrreqs rip_usrreqs = { 508 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect, 509 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect, 510 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp, 511 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown, 512 in_setsockaddr 513 }; 514