raw_ip.c revision 1.20
1 /* $NetBSD: raw_ip.c,v 1.20 1995/06/12 00:47:49 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 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 #include <netinet/ip_mroute.h> 55 #include <netinet/in_pcb.h> 56 57 struct inpcbtable rawcbtable; 58 59 /* 60 * Nominal space allocated to a raw ip socket. 61 */ 62 #define RIPSNDQ 8192 63 #define RIPRCVQ 8192 64 65 /* 66 * Raw interface to IP protocol. 67 */ 68 69 /* 70 * Initialize raw connection block q. 71 */ 72 void 73 rip_init() 74 { 75 76 in_pcbinit(&rawcbtable); 77 } 78 79 struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 80 /* 81 * Setup generic address and protocol structures 82 * for raw_input routine, then pass them along with 83 * mbuf chain. 84 */ 85 void 86 rip_input(m) 87 struct mbuf *m; 88 { 89 register struct ip *ip = mtod(m, struct ip *); 90 register struct inpcb *inp; 91 struct socket *last = 0; 92 93 ripsrc.sin_addr = ip->ip_src; 94 for (inp = rawcbtable.inpt_list.lh_first; inp != 0; 95 inp = inp->inp_list.le_next) { 96 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 97 continue; 98 if (inp->inp_laddr.s_addr && 99 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 100 continue; 101 if (inp->inp_faddr.s_addr && 102 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 103 continue; 104 if (last) { 105 struct mbuf *n; 106 if (n = m_copy(m, 0, (int)M_COPYALL)) { 107 if (sbappendaddr(&last->so_rcv, 108 sintosa(&ripsrc), n, 109 (struct mbuf *)0) == 0) 110 /* should notify about lost packet */ 111 m_freem(n); 112 else 113 sorwakeup(last); 114 } 115 } 116 last = inp->inp_socket; 117 } 118 if (last) { 119 if (sbappendaddr(&last->so_rcv, sintosa(&ripsrc), m, 120 (struct mbuf *)0) == 0) 121 m_freem(m); 122 else 123 sorwakeup(last); 124 } else { 125 m_freem(m); 126 ipstat.ips_noproto++; 127 ipstat.ips_delivered--; 128 } 129 } 130 131 /* 132 * Generate IP header and pass packet to ip_output. 133 * Tack on options user may have setup with control call. 134 */ 135 int 136 rip_output(m, so, dst) 137 register struct mbuf *m; 138 struct socket *so; 139 u_long dst; 140 { 141 register struct ip *ip; 142 register struct inpcb *inp = sotoinpcb(so); 143 struct mbuf *opts; 144 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 145 146 /* 147 * If the user handed us a complete IP packet, use it. 148 * Otherwise, allocate an mbuf for a header and fill it in. 149 */ 150 if ((inp->inp_flags & INP_HDRINCL) == 0) { 151 M_PREPEND(m, sizeof(struct ip), M_WAIT); 152 ip = mtod(m, struct ip *); 153 ip->ip_tos = 0; 154 ip->ip_off = 0; 155 ip->ip_p = inp->inp_ip.ip_p; 156 ip->ip_len = m->m_pkthdr.len; 157 ip->ip_src = inp->inp_laddr; 158 ip->ip_dst.s_addr = dst; 159 ip->ip_ttl = MAXTTL; 160 opts = inp->inp_options; 161 } else { 162 ip = mtod(m, struct ip *); 163 if (ip->ip_id == 0) 164 ip->ip_id = htons(ip_id++); 165 opts = NULL; 166 /* XXX prevent ip_output from overwriting header fields */ 167 flags |= IP_RAWOUTPUT; 168 ipstat.ips_rawout++; 169 } 170 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 171 } 172 173 /* 174 * Raw IP socket option processing. 175 */ 176 int 177 rip_ctloutput(op, so, level, optname, m) 178 int op; 179 struct socket *so; 180 int level, optname; 181 struct mbuf **m; 182 { 183 register struct inpcb *inp = sotoinpcb(so); 184 register int error; 185 186 if (level != IPPROTO_IP) { 187 if (m != 0 && *m != 0) 188 (void)m_free(*m); 189 return (EINVAL); 190 } 191 192 switch (optname) { 193 194 case IP_HDRINCL: 195 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 196 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 197 return (EINVAL); 198 if (op == PRCO_SETOPT) { 199 if (*mtod(*m, int *)) 200 inp->inp_flags |= INP_HDRINCL; 201 else 202 inp->inp_flags &= ~INP_HDRINCL; 203 (void)m_free(*m); 204 } else { 205 (*m)->m_len = sizeof (int); 206 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 207 } 208 return (0); 209 } 210 break; 211 212 case MRT_INIT: 213 case MRT_DONE: 214 case MRT_ADD_VIF: 215 case MRT_DEL_VIF: 216 case MRT_ADD_MFC: 217 case MRT_DEL_MFC: 218 case MRT_VERSION: 219 case MRT_ASSERT: 220 #ifdef MROUTING 221 switch (op) { 222 case PRCO_SETOPT: 223 error = ip_mrouter_set(optname, so, m); 224 break; 225 case PRCO_GETOPT: 226 error = ip_mrouter_get(optname, so, m); 227 break; 228 default: 229 error = EINVAL; 230 break; 231 } 232 return (error); 233 #else 234 if (op == PRCO_SETOPT && *m) 235 m_free(*m); 236 return (EOPNOTSUPP); 237 #endif 238 } 239 return (ip_ctloutput(op, so, level, optname, m)); 240 } 241 242 u_long rip_sendspace = RIPSNDQ; 243 u_long rip_recvspace = RIPRCVQ; 244 245 /*ARGSUSED*/ 246 int 247 rip_usrreq(so, req, m, nam, control) 248 register struct socket *so; 249 int req; 250 struct mbuf *m, *nam, *control; 251 { 252 register int error = 0; 253 register struct inpcb *inp = sotoinpcb(so); 254 #ifdef MROUTING 255 extern struct socket *ip_mrouter; 256 #endif 257 switch (req) { 258 259 case PRU_ATTACH: 260 if (inp) 261 panic("rip_attach"); 262 if ((so->so_state & SS_PRIV) == 0) { 263 error = EACCES; 264 break; 265 } 266 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 267 (error = in_pcballoc(so, &rawcbtable))) 268 break; 269 inp = (struct inpcb *)so->so_pcb; 270 inp->inp_ip.ip_p = (long)nam; 271 break; 272 273 case PRU_DISCONNECT: 274 if ((so->so_state & SS_ISCONNECTED) == 0) { 275 error = ENOTCONN; 276 break; 277 } 278 /* FALLTHROUGH */ 279 case PRU_ABORT: 280 soisdisconnected(so); 281 /* FALLTHROUGH */ 282 case PRU_DETACH: 283 if (inp == 0) 284 panic("rip_detach"); 285 #ifdef MROUTING 286 if (so == ip_mrouter) 287 ip_mrouter_done(); 288 #endif 289 in_pcbdetach(inp); 290 break; 291 292 case PRU_BIND: 293 { 294 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 295 296 if (nam->m_len != sizeof(*addr)) { 297 error = EINVAL; 298 break; 299 } 300 if ((ifnet.tqh_first == 0) || 301 ((addr->sin_family != AF_INET) && 302 (addr->sin_family != AF_IMPLINK)) || 303 (addr->sin_addr.s_addr && 304 ifa_ifwithaddr(sintosa(addr)) == 0)) { 305 error = EADDRNOTAVAIL; 306 break; 307 } 308 inp->inp_laddr = addr->sin_addr; 309 break; 310 } 311 case PRU_CONNECT: 312 { 313 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 314 315 if (nam->m_len != sizeof(*addr)) { 316 error = EINVAL; 317 break; 318 } 319 if (ifnet.tqh_first == 0) { 320 error = EADDRNOTAVAIL; 321 break; 322 } 323 if ((addr->sin_family != AF_INET) && 324 (addr->sin_family != AF_IMPLINK)) { 325 error = EAFNOSUPPORT; 326 break; 327 } 328 inp->inp_faddr = addr->sin_addr; 329 soisconnected(so); 330 break; 331 } 332 333 case PRU_CONNECT2: 334 error = EOPNOTSUPP; 335 break; 336 337 /* 338 * Mark the connection as being incapable of further input. 339 */ 340 case PRU_SHUTDOWN: 341 socantsendmore(so); 342 break; 343 344 /* 345 * Ship a packet out. The appropriate raw output 346 * routine handles any massaging necessary. 347 */ 348 case PRU_SEND: 349 { 350 register u_int32_t dst; 351 352 if (so->so_state & SS_ISCONNECTED) { 353 if (nam) { 354 error = EISCONN; 355 break; 356 } 357 dst = inp->inp_faddr.s_addr; 358 } else { 359 if (nam == NULL) { 360 error = ENOTCONN; 361 break; 362 } 363 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 364 } 365 error = rip_output(m, so, dst); 366 m = NULL; 367 break; 368 } 369 370 case PRU_SENSE: 371 /* 372 * stat: don't bother with a blocksize. 373 */ 374 return (0); 375 376 /* 377 * Not supported. 378 */ 379 case PRU_RCVOOB: 380 case PRU_RCVD: 381 case PRU_LISTEN: 382 case PRU_ACCEPT: 383 case PRU_SENDOOB: 384 error = EOPNOTSUPP; 385 break; 386 387 case PRU_SOCKADDR: 388 in_setsockaddr(inp, nam); 389 break; 390 391 case PRU_PEERADDR: 392 in_setpeeraddr(inp, nam); 393 break; 394 395 default: 396 panic("rip_usrreq"); 397 } 398 if (m != NULL) 399 m_freem(m); 400 return (error); 401 } 402
Indexes created Mon Sep 29 21:09:56 GMT 2025