Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/raw_ip.c
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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 * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.37.2.7 1999/09/05 08:18:36 peter Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/queue.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/socket.h> 42 #include <sys/protosw.h> 43 #include <sys/socketvar.h> 44 #include <sys/errno.h> 45 #include <sys/systm.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #define _IP_VHL 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/in_pcb.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip_var.h> 57 #include <netinet/ip_mroute.h> 58 59 #include <netinet/ip_fw.h> 60 61 #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 62 #undef COMPAT_IPFW 63 #define COMPAT_IPFW 1 64 #else 65 #undef COMPAT_IPFW 66 #endif 67 68 static struct inpcbhead ripcb; 69 static struct inpcbinfo ripcbinfo; 70 71 /* 72 * Nominal space allocated to a raw ip socket. 73 */ 74 #define RIPSNDQ 8192 75 #define RIPRCVQ 8192 76 77 /* 78 * Raw interface to IP protocol. 79 */ 80 81 /* 82 * Initialize raw connection block q. 83 */ 84 void 85 rip_init() 86 { 87 LIST_INIT(&ripcb); 88 ripcbinfo.listhead = &ripcb; 89 /* 90 * XXX We don't use the hash list for raw IP, but it's easier 91 * to allocate a one entry hash list than it is to check all 92 * over the place for hashbase == NULL. 93 */ 94 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); 95 } 96 97 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 98 /* 99 * Setup generic address and protocol structures 100 * for raw_input routine, then pass them along with 101 * mbuf chain. 102 */ 103 void 104 rip_input(m, iphlen) 105 struct mbuf *m; 106 int iphlen; 107 { 108 register struct ip *ip = mtod(m, struct ip *); 109 register struct inpcb *inp; 110 struct inpcb *last = 0; 111 struct mbuf *opts = 0; 112 113 ripsrc.sin_addr = ip->ip_src; 114 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 115 if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p) 116 continue; 117 if (inp->inp_laddr.s_addr && 118 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 119 continue; 120 if (inp->inp_faddr.s_addr && 121 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 122 continue; 123 if (last) { 124 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 125 if (n) { 126 if (last->inp_flags & INP_CONTROLOPTS || 127 last->inp_socket->so_options & SO_TIMESTAMP) 128 ip_savecontrol(last, &opts, ip, n); 129 if (sbappendaddr(&last->inp_socket->so_rcv, 130 (struct sockaddr *)&ripsrc, n, 131 opts) == 0) { 132 /* should notify about lost packet */ 133 m_freem(n); 134 if (opts) 135 m_freem(opts); 136 } else 137 sorwakeup(last->inp_socket); 138 opts = 0; 139 } 140 } 141 last = inp; 142 } 143 if (last) { 144 if (last->inp_flags & INP_CONTROLOPTS || 145 last->inp_socket->so_options & SO_TIMESTAMP) 146 ip_savecontrol(last, &opts, ip, m); 147 if (sbappendaddr(&last->inp_socket->so_rcv, 148 (struct sockaddr *)&ripsrc, m, opts) == 0) { 149 m_freem(m); 150 if (opts) 151 m_freem(opts); 152 } else 153 sorwakeup(last->inp_socket); 154 } else { 155 m_freem(m); 156 ipstat.ips_noproto++; 157 ipstat.ips_delivered--; 158 } 159 } 160 161 /* 162 * Generate IP header and pass packet to ip_output. 163 * Tack on options user may have setup with control call. 164 */ 165 int 166 rip_output(m, so, dst) 167 register struct mbuf *m; 168 struct socket *so; 169 u_long dst; 170 { 171 register struct ip *ip; 172 register struct inpcb *inp = sotoinpcb(so); 173 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 174 175 /* 176 * If the user handed us a complete IP packet, use it. 177 * Otherwise, allocate an mbuf for a header and fill it in. 178 */ 179 if ((inp->inp_flags & INP_HDRINCL) == 0) { 180 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 181 m_freem(m); 182 return(EMSGSIZE); 183 } 184 M_PREPEND(m, sizeof(struct ip), M_WAIT); 185 ip = mtod(m, struct ip *); 186 ip->ip_tos = 0; 187 ip->ip_off = 0; 188 ip->ip_p = inp->inp_ip_p; 189 ip->ip_len = m->m_pkthdr.len; 190 ip->ip_src = inp->inp_laddr; 191 ip->ip_dst.s_addr = dst; 192 ip->ip_ttl = MAXTTL; 193 } else { 194 if (m->m_pkthdr.len > IP_MAXPACKET) { 195 m_freem(m); 196 return(EMSGSIZE); 197 } 198 ip = mtod(m, struct ip *); 199 /* don't allow both user specified and setsockopt options, 200 and don't allow packet length sizes that will crash */ 201 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 202 && inp->inp_options) 203 || (ip->ip_len > m->m_pkthdr.len) 204 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { 205 m_freem(m); 206 return EINVAL; 207 } 208 if (ip->ip_id == 0) 209 ip->ip_id = htons(ip_id++); 210 /* XXX prevent ip_output from overwriting header fields */ 211 flags |= IP_RAWOUTPUT; 212 ipstat.ips_rawout++; 213 } 214 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 215 inp->inp_moptions)); 216 } 217 218 /* 219 * Raw IP socket option processing. 220 */ 221 int 222 rip_ctloutput(op, so, level, optname, m) 223 int op; 224 struct socket *so; 225 int level, optname; 226 struct mbuf **m; 227 { 228 register struct inpcb *inp = sotoinpcb(so); 229 register int error; 230 231 if (level != IPPROTO_IP) { 232 if (op == PRCO_SETOPT && *m) 233 (void)m_free(*m); 234 return (EINVAL); 235 } 236 237 switch (optname) { 238 239 case IP_HDRINCL: 240 error = 0; 241 if (op == PRCO_SETOPT) { 242 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 243 error = EINVAL; 244 else if (*mtod(*m, int *)) 245 inp->inp_flags |= INP_HDRINCL; 246 else 247 inp->inp_flags &= ~INP_HDRINCL; 248 if (*m) 249 (void)m_free(*m); 250 } else { 251 *m = m_get(M_WAIT, MT_SOOPTS); 252 (*m)->m_len = sizeof (int); 253 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 254 } 255 return (error); 256 257 #ifdef COMPAT_IPFW 258 case IP_FW_GET: 259 if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { 260 if (*m) (void)m_free(*m); 261 return(EINVAL); 262 } 263 return (*ip_fw_ctl_ptr)(optname, m); 264 265 case IP_FW_ADD: 266 case IP_FW_DEL: 267 case IP_FW_FLUSH: 268 case IP_FW_ZERO: 269 if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { 270 if (*m) (void)m_free(*m); 271 return(EINVAL); 272 } 273 return (*ip_fw_ctl_ptr)(optname, m); 274 275 case IP_NAT: 276 if (ip_nat_ctl_ptr == NULL) { 277 if (*m) (void)m_free(*m); 278 return(EINVAL); 279 } 280 return (*ip_nat_ctl_ptr)(op, m); 281 282 #endif 283 #ifdef DUMMYNET 284 case IP_DUMMYNET_GET: 285 if (ip_dn_ctl_ptr == NULL || op == PRCO_SETOPT) { 286 if (*m) (void)m_free(*m); 287 return(EINVAL); 288 } 289 return (*ip_dn_ctl_ptr)(optname, m); 290 291 case IP_DUMMYNET_CONFIGURE: 292 case IP_DUMMYNET_DEL: 293 case IP_DUMMYNET_FLUSH: 294 if (ip_dn_ctl_ptr == NULL || op != PRCO_SETOPT) { 295 if (*m) (void)m_free(*m); 296 return(EINVAL); 297 } 298 return (*ip_dn_ctl_ptr)(optname, m); 299 #endif 300 case IP_RSVP_ON: 301 return ip_rsvp_init(so); 302 break; 303 304 case IP_RSVP_OFF: 305 return ip_rsvp_done(); 306 break; 307 308 case IP_RSVP_VIF_ON: 309 return ip_rsvp_vif_init(so, *m); 310 311 case IP_RSVP_VIF_OFF: 312 return ip_rsvp_vif_done(so, *m); 313 314 case MRT_INIT: 315 case MRT_DONE: 316 case MRT_ADD_VIF: 317 case MRT_DEL_VIF: 318 case MRT_ADD_MFC: 319 case MRT_DEL_MFC: 320 case MRT_VERSION: 321 case MRT_ASSERT: 322 if (op == PRCO_SETOPT) { 323 error = ip_mrouter_set(optname, so, *m); 324 if (*m) 325 (void)m_free(*m); 326 } else if (op == PRCO_GETOPT) { 327 error = ip_mrouter_get(optname, so, m); 328 } else 329 error = EINVAL; 330 return (error); 331 } 332 return (ip_ctloutput(op, so, level, optname, m)); 333 } 334 335 static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ 336 static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ 337 338 /*ARGSUSED*/ 339 int 340 rip_usrreq(so, req, m, nam, control) 341 register struct socket *so; 342 int req; 343 struct mbuf *m, *nam, *control; 344 { 345 register int error = 0; 346 register struct inpcb *inp = sotoinpcb(so); 347 int s; 348 349 if (req == PRU_CONTROL) 350 return (in_control(so, (u_long)m, (caddr_t)nam, 351 (struct ifnet *)control)); 352 353 switch (req) { 354 355 case PRU_ATTACH: 356 if (inp) 357 panic("rip_attach"); 358 if ((so->so_state & SS_PRIV) == 0) { 359 error = EACCES; 360 break; 361 } 362 s = splnet(); 363 error = in_pcballoc(so, &ripcbinfo); 364 splx(s); 365 if (error) 366 break; 367 error = soreserve(so, rip_sendspace, rip_recvspace); 368 if (error) 369 break; 370 inp = (struct inpcb *)so->so_pcb; 371 inp->inp_ip_p = (int)nam; 372 break; 373 374 case PRU_DISCONNECT: 375 if ((so->so_state & SS_ISCONNECTED) == 0) { 376 error = ENOTCONN; 377 break; 378 } 379 /* FALLTHROUGH */ 380 case PRU_ABORT: 381 soisdisconnected(so); 382 /* FALLTHROUGH */ 383 case PRU_DETACH: 384 if (inp == 0) 385 panic("rip_detach"); 386 if (so == ip_mrouter) 387 ip_mrouter_done(); 388 ip_rsvp_force_done(so); 389 if (so == ip_rsvpd) 390 ip_rsvp_done(); 391 in_pcbdetach(inp); 392 break; 393 394 case PRU_BIND: 395 { 396 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 397 398 if (nam->m_len != sizeof(*addr)) { 399 error = EINVAL; 400 break; 401 } 402 if ((ifnet == 0) || 403 ((addr->sin_family != AF_INET) && 404 (addr->sin_family != AF_IMPLINK)) || 405 (addr->sin_addr.s_addr && 406 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 407 error = EADDRNOTAVAIL; 408 break; 409 } 410 inp->inp_laddr = addr->sin_addr; 411 break; 412 } 413 case PRU_CONNECT: 414 { 415 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 416 417 if (nam->m_len != sizeof(*addr)) { 418 error = EINVAL; 419 break; 420 } 421 if (ifnet == 0) { 422 error = EADDRNOTAVAIL; 423 break; 424 } 425 if ((addr->sin_family != AF_INET) && 426 (addr->sin_family != AF_IMPLINK)) { 427 error = EAFNOSUPPORT; 428 break; 429 } 430 inp->inp_faddr = addr->sin_addr; 431 soisconnected(so); 432 break; 433 } 434 435 case PRU_CONNECT2: 436 error = EOPNOTSUPP; 437 break; 438 439 /* 440 * Mark the connection as being incapable of further input. 441 */ 442 case PRU_SHUTDOWN: 443 socantsendmore(so); 444 break; 445 446 /* 447 * Ship a packet out. The appropriate raw output 448 * routine handles any massaging necessary. 449 */ 450 case PRU_SEND: 451 { 452 register u_long dst; 453 454 if (so->so_state & SS_ISCONNECTED) { 455 if (nam) { 456 error = EISCONN; 457 break; 458 } 459 dst = inp->inp_faddr.s_addr; 460 } else { 461 if (nam == NULL) { 462 error = ENOTCONN; 463 break; 464 } 465 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 466 } 467 error = rip_output(m, so, dst); 468 m = NULL; 469 break; 470 } 471 472 case PRU_SENSE: 473 /* 474 * stat: don't bother with a blocksize. 475 */ 476 return (0); 477 478 /* 479 * Not supported. 480 */ 481 case PRU_RCVOOB: 482 case PRU_RCVD: 483 case PRU_LISTEN: 484 case PRU_ACCEPT: 485 case PRU_SENDOOB: 486 error = EOPNOTSUPP; 487 break; 488 489 case PRU_SOCKADDR: 490 in_setsockaddr(inp, nam); 491 break; 492 493 case PRU_PEERADDR: 494 in_setpeeraddr(inp, nam); 495 break; 496 497 default: 498 panic("rip_usrreq"); 499 } 500 if (m != NULL) 501 m_freem(m); 502 return (error); 503 }
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