raw_ip.c revision 1.27
1 /* $NetBSD: raw_ip.c,v 1.27 1996/05/23 16:12:15 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 36 */ 37 38 #include <sys/param.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 #include <sys/proc.h> 47 48 #include <net/if.h> 49 #include <net/route.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/ip_mroute.h> 56 #include <netinet/in_pcb.h> 57 #include <netinet/in_var.h> 58 59 #include <machine/stdarg.h> 60 61 struct inpcbtable rawcbtable; 62 63 /* 64 * Nominal space allocated to a raw ip socket. 65 */ 66 #define RIPSNDQ 8192 67 #define RIPRCVQ 8192 68 69 /* 70 * Raw interface to IP protocol. 71 */ 72 73 /* 74 * Initialize raw connection block q. 75 */ 76 void 77 rip_init() 78 { 79 80 in_pcbinit(&rawcbtable, 1); 81 } 82 83 struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 84 /* 85 * Setup generic address and protocol structures 86 * for raw_input routine, then pass them along with 87 * mbuf chain. 88 */ 89 void 90 #if __STDC__ 91 rip_input(struct mbuf *m, ...) 92 #else 93 rip_input(m, va_alist) 94 struct mbuf *m; 95 va_dcl 96 #endif 97 { 98 register struct ip *ip = mtod(m, struct ip *); 99 register struct inpcb *inp; 100 struct socket *last = 0; 101 102 ripsrc.sin_addr = ip->ip_src; 103 for (inp = rawcbtable.inpt_queue.cqh_first; 104 inp != (struct inpcb *)&rawcbtable.inpt_queue; 105 inp = inp->inp_queue.cqe_next) { 106 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 107 continue; 108 if (inp->inp_laddr.s_addr != INADDR_ANY && 109 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 110 continue; 111 if (inp->inp_faddr.s_addr != INADDR_ANY && 112 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 113 continue; 114 if (last) { 115 struct mbuf *n; 116 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 117 if (sbappendaddr(&last->so_rcv, 118 sintosa(&ripsrc), n, 119 (struct mbuf *)0) == 0) 120 /* should notify about lost packet */ 121 m_freem(n); 122 else 123 sorwakeup(last); 124 } 125 } 126 last = inp->inp_socket; 127 } 128 if (last) { 129 if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m, 130 (struct mbuf *)0) == 0) 131 m_freem(m); 132 else 133 sorwakeup(last); 134 } else { 135 m_freem(m); 136 ipstat.ips_noproto++; 137 ipstat.ips_delivered--; 138 } 139 } 140 141 /* 142 * Generate IP header and pass packet to ip_output. 143 * Tack on options user may have setup with control call. 144 */ 145 int 146 #if __STDC__ 147 rip_output(struct mbuf *m, ...) 148 #else 149 rip_output(m, va_alist) 150 struct mbuf *m; 151 va_dcl 152 #endif 153 { 154 register struct inpcb *inp; 155 register struct ip *ip; 156 struct mbuf *opts; 157 int flags; 158 va_list ap; 159 160 va_start(ap, m); 161 inp = va_arg(ap, struct inpcb *); 162 va_end(ap); 163 164 flags = 165 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 166 167 /* 168 * If the user handed us a complete IP packet, use it. 169 * Otherwise, allocate an mbuf for a header and fill it in. 170 */ 171 if ((inp->inp_flags & INP_HDRINCL) == 0) { 172 M_PREPEND(m, sizeof(struct ip), M_WAIT); 173 ip = mtod(m, struct ip *); 174 ip->ip_tos = 0; 175 ip->ip_off = 0; 176 ip->ip_p = inp->inp_ip.ip_p; 177 ip->ip_len = m->m_pkthdr.len; 178 ip->ip_src = inp->inp_laddr; 179 ip->ip_dst = inp->inp_faddr; 180 ip->ip_ttl = MAXTTL; 181 opts = inp->inp_options; 182 } else { 183 ip = mtod(m, struct ip *); 184 if (ip->ip_id == 0) 185 ip->ip_id = htons(ip_id++); 186 opts = NULL; 187 /* XXX prevent ip_output from overwriting header fields */ 188 flags |= IP_RAWOUTPUT; 189 ipstat.ips_rawout++; 190 } 191 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 192 } 193 194 /* 195 * Raw IP socket option processing. 196 */ 197 int 198 rip_ctloutput(op, so, level, optname, m) 199 int op; 200 struct socket *so; 201 int level, optname; 202 struct mbuf **m; 203 { 204 register struct inpcb *inp = sotoinpcb(so); 205 #ifdef MROUTING 206 int error; 207 #endif 208 209 if (level != IPPROTO_IP) { 210 if (m != 0 && *m != 0) 211 (void)m_free(*m); 212 return (EINVAL); 213 } 214 215 switch (optname) { 216 217 case IP_HDRINCL: 218 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 219 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 220 return (EINVAL); 221 if (op == PRCO_SETOPT) { 222 if (*mtod(*m, int *)) 223 inp->inp_flags |= INP_HDRINCL; 224 else 225 inp->inp_flags &= ~INP_HDRINCL; 226 (void)m_free(*m); 227 } else { 228 (*m)->m_len = sizeof (int); 229 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 230 } 231 return (0); 232 } 233 break; 234 235 case MRT_INIT: 236 case MRT_DONE: 237 case MRT_ADD_VIF: 238 case MRT_DEL_VIF: 239 case MRT_ADD_MFC: 240 case MRT_DEL_MFC: 241 case MRT_VERSION: 242 case MRT_ASSERT: 243 #ifdef MROUTING 244 switch (op) { 245 case PRCO_SETOPT: 246 error = ip_mrouter_set(optname, so, m); 247 break; 248 case PRCO_GETOPT: 249 error = ip_mrouter_get(optname, so, m); 250 break; 251 default: 252 error = EINVAL; 253 break; 254 } 255 return (error); 256 #else 257 if (op == PRCO_SETOPT && *m) 258 m_free(*m); 259 return (EOPNOTSUPP); 260 #endif 261 } 262 return (ip_ctloutput(op, so, level, optname, m)); 263 } 264 265 int 266 rip_connect(inp, nam) 267 struct inpcb *inp; 268 struct mbuf *nam; 269 { 270 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 271 272 if (nam->m_len != sizeof(*addr)) 273 return (EINVAL); 274 if (ifnet.tqh_first == 0) 275 return (EADDRNOTAVAIL); 276 if (addr->sin_family != AF_INET && 277 addr->sin_family != AF_IMPLINK) 278 return (EAFNOSUPPORT); 279 inp->inp_faddr = addr->sin_addr; 280 return (0); 281 } 282 283 void 284 rip_disconnect(inp) 285 struct inpcb *inp; 286 { 287 288 inp->inp_faddr.s_addr = INADDR_ANY; 289 } 290 291 u_long rip_sendspace = RIPSNDQ; 292 u_long rip_recvspace = RIPRCVQ; 293 294 /*ARGSUSED*/ 295 int 296 rip_usrreq(so, req, m, nam, control, p) 297 register struct socket *so; 298 int req; 299 struct mbuf *m, *nam, *control; 300 struct proc *p; 301 { 302 register struct inpcb *inp; 303 int s; 304 register int error = 0; 305 #ifdef MROUTING 306 extern struct socket *ip_mrouter; 307 #endif 308 309 if (req == PRU_CONTROL) 310 return (in_control(so, (long)m, (caddr_t)nam, 311 (struct ifnet *)control, p)); 312 313 s = splsoftnet(); 314 inp = sotoinpcb(so); 315 if (control && control->m_len) { 316 m_freem(control); 317 error = EINVAL; 318 goto release; 319 } 320 if (inp == 0 && req != PRU_ATTACH) { 321 error = EINVAL; 322 goto release; 323 } 324 325 switch (req) { 326 327 case PRU_ATTACH: 328 if (inp != 0) { 329 error = EISCONN; 330 break; 331 } 332 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 333 error = EACCES; 334 break; 335 } 336 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 337 error = soreserve(so, rip_sendspace, rip_recvspace); 338 if (error) 339 break; 340 } 341 error = in_pcballoc(so, &rawcbtable); 342 if (error) 343 break; 344 inp = sotoinpcb(so); 345 inp->inp_ip.ip_p = (long)nam; 346 break; 347 348 case PRU_DETACH: 349 #ifdef MROUTING 350 if (so == ip_mrouter) 351 ip_mrouter_done(); 352 #endif 353 in_pcbdetach(inp); 354 break; 355 356 case PRU_BIND: 357 { 358 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 359 360 if (nam->m_len != sizeof(*addr)) { 361 error = EINVAL; 362 break; 363 } 364 if (ifnet.tqh_first == 0) { 365 error = EADDRNOTAVAIL; 366 break; 367 } 368 if (addr->sin_family != AF_INET && 369 addr->sin_family != AF_IMPLINK) { 370 error = EAFNOSUPPORT; 371 break; 372 } 373 if (addr->sin_addr.s_addr != INADDR_ANY && 374 ifa_ifwithaddr(sintosa(addr)) == 0) { 375 error = EADDRNOTAVAIL; 376 break; 377 } 378 inp->inp_laddr = addr->sin_addr; 379 break; 380 } 381 382 case PRU_LISTEN: 383 error = EOPNOTSUPP; 384 break; 385 386 case PRU_CONNECT: 387 error = rip_connect(inp, nam); 388 if (error) 389 break; 390 soisconnected(so); 391 break; 392 393 case PRU_CONNECT2: 394 error = EOPNOTSUPP; 395 break; 396 397 case PRU_DISCONNECT: 398 soisdisconnected(so); 399 rip_disconnect(inp); 400 break; 401 402 /* 403 * Mark the connection as being incapable of further input. 404 */ 405 case PRU_SHUTDOWN: 406 socantsendmore(so); 407 break; 408 409 case PRU_RCVD: 410 error = EOPNOTSUPP; 411 break; 412 413 /* 414 * Ship a packet out. The appropriate raw output 415 * routine handles any massaging necessary. 416 */ 417 case PRU_SEND: 418 { 419 struct in_addr faddr; 420 421 if (nam) { 422 if ((so->so_state & SS_ISCONNECTED) != 0) { 423 m_freem(m); 424 error = EISCONN; 425 break; 426 } 427 error = rip_connect(inp, nam); 428 if (error) { 429 m_freem(m); 430 break; 431 } 432 } else { 433 if ((so->so_state & SS_ISCONNECTED) == 0) { 434 m_freem(m); 435 error = ENOTCONN; 436 break; 437 } 438 } 439 error = rip_output(m, inp); 440 if (nam) 441 rip_disconnect(inp); 442 break; 443 } 444 445 case PRU_SENSE: 446 /* 447 * stat: don't bother with a blocksize. 448 */ 449 splx(s); 450 return (0); 451 452 case PRU_RCVOOB: 453 error = EOPNOTSUPP; 454 break; 455 456 case PRU_SENDOOB: 457 m_freem(m); 458 error = EOPNOTSUPP; 459 break; 460 461 case PRU_SOCKADDR: 462 in_setsockaddr(inp, nam); 463 break; 464 465 case PRU_PEERADDR: 466 in_setpeeraddr(inp, nam); 467 break; 468 469 default: 470 panic("rip_usrreq"); 471 } 472 473 release: 474 splx(s); 475 return (error); 476 } 477
Indexes created Mon Sep 29 21:09:56 GMT 2025