raw_ip.c revision 1.31
1 /* $NetBSD: raw_ip.c,v 1.31 1996/06/23 12:12:49 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 int rip_bind __P((struct inpcb *, struct mbuf *)); 64 int rip_connect __P((struct inpcb *, struct mbuf *)); 65 void rip_disconnect __P((struct inpcb *)); 66 67 /* 68 * Nominal space allocated to a raw ip socket. 69 */ 70 #define RIPSNDQ 8192 71 #define RIPRCVQ 8192 72 73 /* 74 * Raw interface to IP protocol. 75 */ 76 77 /* 78 * Initialize raw connection block q. 79 */ 80 void 81 rip_init() 82 { 83 84 in_pcbinit(&rawcbtable, 1); 85 } 86 87 struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 88 /* 89 * Setup generic address and protocol structures 90 * for raw_input routine, then pass them along with 91 * mbuf chain. 92 */ 93 void 94 #if __STDC__ 95 rip_input(struct mbuf *m, ...) 96 #else 97 rip_input(m, va_alist) 98 struct mbuf *m; 99 va_dcl 100 #endif 101 { 102 register struct ip *ip = mtod(m, struct ip *); 103 register struct inpcb *inp; 104 struct socket *last = 0; 105 106 ripsrc.sin_addr = ip->ip_src; 107 for (inp = rawcbtable.inpt_queue.cqh_first; 108 inp != (struct inpcb *)&rawcbtable.inpt_queue; 109 inp = inp->inp_queue.cqe_next) { 110 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 111 continue; 112 if (inp->inp_laddr.s_addr != INADDR_ANY && 113 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 114 continue; 115 if (inp->inp_faddr.s_addr != INADDR_ANY && 116 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 117 continue; 118 if (last) { 119 struct mbuf *n; 120 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 121 if (sbappendaddr(&last->so_rcv, 122 sintosa(&ripsrc), n, 123 (struct mbuf *)0) == 0) 124 /* should notify about lost packet */ 125 m_freem(n); 126 else 127 sorwakeup(last); 128 } 129 } 130 last = inp->inp_socket; 131 } 132 if (last) { 133 if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m, 134 (struct mbuf *)0) == 0) 135 m_freem(m); 136 else 137 sorwakeup(last); 138 } else { 139 m_freem(m); 140 ipstat.ips_noproto++; 141 ipstat.ips_delivered--; 142 } 143 } 144 145 /* 146 * Generate IP header and pass packet to ip_output. 147 * Tack on options user may have setup with control call. 148 */ 149 int 150 #if __STDC__ 151 rip_output(struct mbuf *m, ...) 152 #else 153 rip_output(m, va_alist) 154 struct mbuf *m; 155 va_dcl 156 #endif 157 { 158 register struct inpcb *inp; 159 register struct ip *ip; 160 struct mbuf *opts; 161 int flags; 162 va_list ap; 163 164 va_start(ap, m); 165 inp = va_arg(ap, struct inpcb *); 166 va_end(ap); 167 168 flags = 169 (inp->inp_socket->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 170 171 /* 172 * If the user handed us a complete IP packet, use it. 173 * Otherwise, allocate an mbuf for a header and fill it in. 174 */ 175 if ((inp->inp_flags & INP_HDRINCL) == 0) { 176 M_PREPEND(m, sizeof(struct ip), M_WAIT); 177 ip = mtod(m, struct ip *); 178 ip->ip_tos = 0; 179 ip->ip_off = 0; 180 ip->ip_p = inp->inp_ip.ip_p; 181 ip->ip_len = m->m_pkthdr.len; 182 ip->ip_src = inp->inp_laddr; 183 ip->ip_dst = inp->inp_faddr; 184 ip->ip_ttl = MAXTTL; 185 opts = inp->inp_options; 186 } else { 187 ip = mtod(m, struct ip *); 188 if (ip->ip_id == 0) 189 ip->ip_id = htons(ip_id++); 190 opts = NULL; 191 /* XXX prevent ip_output from overwriting header fields */ 192 flags |= IP_RAWOUTPUT; 193 ipstat.ips_rawout++; 194 } 195 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 196 } 197 198 /* 199 * Raw IP socket option processing. 200 */ 201 int 202 rip_ctloutput(op, so, level, optname, m) 203 int op; 204 struct socket *so; 205 int level, optname; 206 struct mbuf **m; 207 { 208 register struct inpcb *inp = sotoinpcb(so); 209 int error = 0; 210 211 if (level != IPPROTO_IP) { 212 error = ENOPROTOOPT; 213 if (op == PRCO_SETOPT && *m != 0) 214 (void) m_free(*m); 215 } else switch (op) { 216 217 case PRCO_SETOPT: 218 switch (optname) { 219 case IP_HDRINCL: 220 if (*m == 0 || (*m)->m_len < sizeof (int)) 221 error = EINVAL; 222 else { 223 if (*mtod(*m, int *)) 224 inp->inp_flags |= INP_HDRINCL; 225 else 226 inp->inp_flags &= ~INP_HDRINCL; 227 } 228 if (*m != 0) 229 (void) m_free(*m); 230 break; 231 232 #ifdef MROUTING 233 case MRT_INIT: 234 case MRT_DONE: 235 case MRT_ADD_VIF: 236 case MRT_DEL_VIF: 237 case MRT_ADD_MFC: 238 case MRT_DEL_MFC: 239 case MRT_ASSERT: 240 error = ip_mrouter_set(so, optname, m); 241 break; 242 #endif 243 244 default: 245 error = ip_ctloutput(op, so, level, optname, m); 246 break; 247 } 248 break; 249 250 case PRCO_GETOPT: 251 switch (optname) { 252 case IP_HDRINCL: 253 *m = m_get(M_WAIT, M_SOOPTS); 254 (*m)->m_len = sizeof (int); 255 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL ? 1 : 0; 256 break; 257 258 #ifdef MROUTING 259 case MRT_VERSION: 260 case MRT_ASSERT: 261 error = ip_mrouter_get(so, optname, m); 262 break; 263 #endif 264 265 default: 266 error = ip_ctloutput(op, so, level, optname, m); 267 break; 268 } 269 break; 270 } 271 return (error); 272 } 273 274 int 275 rip_bind(inp, nam) 276 struct inpcb *inp; 277 struct mbuf *nam; 278 { 279 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 280 281 if (nam->m_len != sizeof(*addr)) 282 return (EINVAL); 283 if (ifnet.tqh_first == 0) 284 return (EADDRNOTAVAIL); 285 if (addr->sin_family != AF_INET && 286 addr->sin_family != AF_IMPLINK) 287 return (EAFNOSUPPORT); 288 if (addr->sin_addr.s_addr != INADDR_ANY && 289 ifa_ifwithaddr(sintosa(addr)) == 0) 290 return (EADDRNOTAVAIL); 291 inp->inp_laddr = addr->sin_addr; 292 return (0); 293 } 294 295 int 296 rip_connect(inp, nam) 297 struct inpcb *inp; 298 struct mbuf *nam; 299 { 300 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 301 302 if (nam->m_len != sizeof(*addr)) 303 return (EINVAL); 304 if (ifnet.tqh_first == 0) 305 return (EADDRNOTAVAIL); 306 if (addr->sin_family != AF_INET && 307 addr->sin_family != AF_IMPLINK) 308 return (EAFNOSUPPORT); 309 inp->inp_faddr = addr->sin_addr; 310 return (0); 311 } 312 313 void 314 rip_disconnect(inp) 315 struct inpcb *inp; 316 { 317 318 inp->inp_faddr.s_addr = INADDR_ANY; 319 } 320 321 u_long rip_sendspace = RIPSNDQ; 322 u_long rip_recvspace = RIPRCVQ; 323 324 /*ARGSUSED*/ 325 int 326 rip_usrreq(so, req, m, nam, control, p) 327 register struct socket *so; 328 int req; 329 struct mbuf *m, *nam, *control; 330 struct proc *p; 331 { 332 register struct inpcb *inp; 333 int s; 334 register int error = 0; 335 #ifdef MROUTING 336 extern struct socket *ip_mrouter; 337 #endif 338 339 if (req == PRU_CONTROL) 340 return (in_control(so, (long)m, (caddr_t)nam, 341 (struct ifnet *)control, p)); 342 343 s = splsoftnet(); 344 inp = sotoinpcb(so); 345 #ifdef DIAGNOSTIC 346 if (req != PRU_SEND && req != PRU_SENDOOB && control) 347 panic("rip_usrreq: unexpected control mbuf"); 348 #endif 349 if (inp == 0 && req != PRU_ATTACH) { 350 error = EINVAL; 351 goto release; 352 } 353 354 switch (req) { 355 356 case PRU_ATTACH: 357 if (inp != 0) { 358 error = EISCONN; 359 break; 360 } 361 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 362 error = EACCES; 363 break; 364 } 365 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 366 error = soreserve(so, rip_sendspace, rip_recvspace); 367 if (error) 368 break; 369 } 370 error = in_pcballoc(so, &rawcbtable); 371 if (error) 372 break; 373 inp = sotoinpcb(so); 374 inp->inp_ip.ip_p = (long)nam; 375 break; 376 377 case PRU_DETACH: 378 #ifdef MROUTING 379 if (so == ip_mrouter) 380 ip_mrouter_done(); 381 #endif 382 in_pcbdetach(inp); 383 break; 384 385 case PRU_BIND: 386 error = rip_bind(inp, nam); 387 break; 388 389 case PRU_LISTEN: 390 error = EOPNOTSUPP; 391 break; 392 393 case PRU_CONNECT: 394 error = rip_connect(inp, nam); 395 if (error) 396 break; 397 soisconnected(so); 398 break; 399 400 case PRU_CONNECT2: 401 error = EOPNOTSUPP; 402 break; 403 404 case PRU_DISCONNECT: 405 soisdisconnected(so); 406 rip_disconnect(inp); 407 break; 408 409 /* 410 * Mark the connection as being incapable of further input. 411 */ 412 case PRU_SHUTDOWN: 413 socantsendmore(so); 414 break; 415 416 case PRU_RCVD: 417 error = EOPNOTSUPP; 418 break; 419 420 /* 421 * Ship a packet out. The appropriate raw output 422 * routine handles any massaging necessary. 423 */ 424 case PRU_SEND: 425 if (control && control->m_len) { 426 m_freem(control); 427 m_freem(m); 428 error = EINVAL; 429 break; 430 } 431 { 432 if (nam) { 433 if ((so->so_state & SS_ISCONNECTED) != 0) { 434 error = EISCONN; 435 goto die; 436 } 437 error = rip_connect(inp, nam); 438 if (error) { 439 die: 440 m_freem(m); 441 break; 442 } 443 } else { 444 if ((so->so_state & SS_ISCONNECTED) == 0) { 445 error = ENOTCONN; 446 goto die; 447 } 448 } 449 error = rip_output(m, inp); 450 if (nam) 451 rip_disconnect(inp); 452 } 453 break; 454 455 case PRU_SENSE: 456 /* 457 * stat: don't bother with a blocksize. 458 */ 459 splx(s); 460 return (0); 461 462 case PRU_RCVOOB: 463 error = EOPNOTSUPP; 464 break; 465 466 case PRU_SENDOOB: 467 m_freem(control); 468 m_freem(m); 469 error = EOPNOTSUPP; 470 break; 471 472 case PRU_SOCKADDR: 473 in_setsockaddr(inp, nam); 474 break; 475 476 case PRU_PEERADDR: 477 in_setpeeraddr(inp, nam); 478 break; 479 480 default: 481 panic("rip_usrreq"); 482 } 483 484 release: 485 splx(s); 486 return (error); 487 } 488
Indexes created Mon Sep 29 21:09:56 GMT 2025