raw_ip.c revision 1.30
1 /* $NetBSD: raw_ip.c,v 1.30 1996/05/28 23:27:04 pk 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 #ifdef MROUTING 210 int error; 211 #endif 212 213 if (level != IPPROTO_IP) { 214 if (m != 0 && *m != 0) 215 (void)m_free(*m); 216 return (EINVAL); 217 } 218 219 switch (optname) { 220 221 case IP_HDRINCL: 222 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 223 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 224 return (EINVAL); 225 if (op == PRCO_SETOPT) { 226 if (*mtod(*m, int *)) 227 inp->inp_flags |= INP_HDRINCL; 228 else 229 inp->inp_flags &= ~INP_HDRINCL; 230 (void)m_free(*m); 231 } else { 232 (*m)->m_len = sizeof (int); 233 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 234 } 235 return (0); 236 } 237 break; 238 239 case MRT_INIT: 240 case MRT_DONE: 241 case MRT_ADD_VIF: 242 case MRT_DEL_VIF: 243 case MRT_ADD_MFC: 244 case MRT_DEL_MFC: 245 case MRT_VERSION: 246 case MRT_ASSERT: 247 #ifdef MROUTING 248 switch (op) { 249 case PRCO_SETOPT: 250 error = ip_mrouter_set(optname, so, m); 251 break; 252 case PRCO_GETOPT: 253 error = ip_mrouter_get(optname, so, m); 254 break; 255 default: 256 error = EINVAL; 257 break; 258 } 259 return (error); 260 #else 261 if (op == PRCO_SETOPT && *m) 262 m_free(*m); 263 return (EOPNOTSUPP); 264 #endif 265 } 266 return (ip_ctloutput(op, so, level, optname, m)); 267 } 268 269 int 270 rip_bind(inp, nam) 271 struct inpcb *inp; 272 struct mbuf *nam; 273 { 274 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 275 276 if (nam->m_len != sizeof(*addr)) 277 return (EINVAL); 278 if (ifnet.tqh_first == 0) 279 return (EADDRNOTAVAIL); 280 if (addr->sin_family != AF_INET && 281 addr->sin_family != AF_IMPLINK) 282 return (EAFNOSUPPORT); 283 if (addr->sin_addr.s_addr != INADDR_ANY && 284 ifa_ifwithaddr(sintosa(addr)) == 0) 285 return (EADDRNOTAVAIL); 286 inp->inp_laddr = addr->sin_addr; 287 return (0); 288 } 289 290 int 291 rip_connect(inp, nam) 292 struct inpcb *inp; 293 struct mbuf *nam; 294 { 295 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 296 297 if (nam->m_len != sizeof(*addr)) 298 return (EINVAL); 299 if (ifnet.tqh_first == 0) 300 return (EADDRNOTAVAIL); 301 if (addr->sin_family != AF_INET && 302 addr->sin_family != AF_IMPLINK) 303 return (EAFNOSUPPORT); 304 inp->inp_faddr = addr->sin_addr; 305 return (0); 306 } 307 308 void 309 rip_disconnect(inp) 310 struct inpcb *inp; 311 { 312 313 inp->inp_faddr.s_addr = INADDR_ANY; 314 } 315 316 u_long rip_sendspace = RIPSNDQ; 317 u_long rip_recvspace = RIPRCVQ; 318 319 /*ARGSUSED*/ 320 int 321 rip_usrreq(so, req, m, nam, control, p) 322 register struct socket *so; 323 int req; 324 struct mbuf *m, *nam, *control; 325 struct proc *p; 326 { 327 register struct inpcb *inp; 328 int s; 329 register int error = 0; 330 #ifdef MROUTING 331 extern struct socket *ip_mrouter; 332 #endif 333 334 if (req == PRU_CONTROL) 335 return (in_control(so, (long)m, (caddr_t)nam, 336 (struct ifnet *)control, p)); 337 338 s = splsoftnet(); 339 inp = sotoinpcb(so); 340 #ifdef DIAGNOSTIC 341 if (req != PRU_SEND && req != PRU_SENDOOB && control) 342 panic("rip_usrreq: unexpected control mbuf"); 343 #endif 344 if (inp == 0 && req != PRU_ATTACH) { 345 error = EINVAL; 346 goto release; 347 } 348 349 switch (req) { 350 351 case PRU_ATTACH: 352 if (inp != 0) { 353 error = EISCONN; 354 break; 355 } 356 if (p == 0 || (error = suser(p->p_ucred, &p->p_acflag))) { 357 error = EACCES; 358 break; 359 } 360 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { 361 error = soreserve(so, rip_sendspace, rip_recvspace); 362 if (error) 363 break; 364 } 365 error = in_pcballoc(so, &rawcbtable); 366 if (error) 367 break; 368 inp = sotoinpcb(so); 369 inp->inp_ip.ip_p = (long)nam; 370 break; 371 372 case PRU_DETACH: 373 #ifdef MROUTING 374 if (so == ip_mrouter) 375 ip_mrouter_done(); 376 #endif 377 in_pcbdetach(inp); 378 break; 379 380 case PRU_BIND: 381 error = rip_bind(inp, nam); 382 break; 383 384 case PRU_LISTEN: 385 error = EOPNOTSUPP; 386 break; 387 388 case PRU_CONNECT: 389 error = rip_connect(inp, nam); 390 if (error) 391 break; 392 soisconnected(so); 393 break; 394 395 case PRU_CONNECT2: 396 error = EOPNOTSUPP; 397 break; 398 399 case PRU_DISCONNECT: 400 soisdisconnected(so); 401 rip_disconnect(inp); 402 break; 403 404 /* 405 * Mark the connection as being incapable of further input. 406 */ 407 case PRU_SHUTDOWN: 408 socantsendmore(so); 409 break; 410 411 case PRU_RCVD: 412 error = EOPNOTSUPP; 413 break; 414 415 /* 416 * Ship a packet out. The appropriate raw output 417 * routine handles any massaging necessary. 418 */ 419 case PRU_SEND: 420 if (control && control->m_len) { 421 m_freem(control); 422 m_freem(m); 423 error = EINVAL; 424 break; 425 } 426 { 427 if (nam) { 428 if ((so->so_state & SS_ISCONNECTED) != 0) { 429 error = EISCONN; 430 goto die; 431 } 432 error = rip_connect(inp, nam); 433 if (error) { 434 die: 435 m_freem(m); 436 break; 437 } 438 } else { 439 if ((so->so_state & SS_ISCONNECTED) == 0) { 440 error = ENOTCONN; 441 goto die; 442 } 443 } 444 error = rip_output(m, inp); 445 if (nam) 446 rip_disconnect(inp); 447 } 448 break; 449 450 case PRU_SENSE: 451 /* 452 * stat: don't bother with a blocksize. 453 */ 454 splx(s); 455 return (0); 456 457 case PRU_RCVOOB: 458 error = EOPNOTSUPP; 459 break; 460 461 case PRU_SENDOOB: 462 m_freem(control); 463 m_freem(m); 464 error = EOPNOTSUPP; 465 break; 466 467 case PRU_SOCKADDR: 468 in_setsockaddr(inp, nam); 469 break; 470 471 case PRU_PEERADDR: 472 in_setpeeraddr(inp, nam); 473 break; 474 475 default: 476 panic("rip_usrreq"); 477 } 478 479 release: 480 splx(s); 481 return (error); 482 } 483
Indexes created Mon Sep 29 21:09:56 GMT 2025