raw_ip.c revision 1.13
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 * from: @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 34 * $Id: raw_ip.c,v 1.13 1994/05/13 06:06:30 mycroft Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/protosw.h> 42 #include <sys/socketvar.h> 43 #include <sys/errno.h> 44 #include <sys/systm.h> 45 46 #include <net/if.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_systm.h> 51 #include <netinet/ip.h> 52 #include <netinet/ip_var.h> 53 #include <netinet/ip_mroute.h> 54 #include <netinet/in_pcb.h> 55 56 struct inpcb rawinpcb; 57 58 /* 59 * Nominal space allocated to a raw ip socket. 60 */ 61 #define RIPSNDQ 8192 62 #define RIPRCVQ 8192 63 64 /* 65 * Raw interface to IP protocol. 66 */ 67 68 /* 69 * Initialize raw connection block q. 70 */ 71 void 72 rip_init() 73 { 74 75 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 76 } 77 78 struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 79 /* 80 * Setup generic address and protocol structures 81 * for raw_input routine, then pass them along with 82 * mbuf chain. 83 */ 84 void 85 rip_input(m) 86 struct mbuf *m; 87 { 88 register struct ip *ip = mtod(m, struct ip *); 89 register struct inpcb *inp; 90 struct socket *last = 0; 91 92 ripsrc.sin_addr = ip->ip_src; 93 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 94 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 95 continue; 96 if (inp->inp_laddr.s_addr && 97 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 98 continue; 99 if (inp->inp_faddr.s_addr && 100 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 101 continue; 102 if (last) { 103 struct mbuf *n; 104 if (n = m_copy(m, 0, (int)M_COPYALL)) { 105 if (sbappendaddr(&last->so_rcv, 106 (struct sockaddr *)&ripsrc, 107 n, (struct mbuf *)0) == 0) 108 /* should notify about lost packet */ 109 m_freem(n); 110 else 111 sorwakeup(last); 112 } 113 } 114 last = inp->inp_socket; 115 } 116 if (last) { 117 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 118 m, (struct mbuf *)0) == 0) 119 m_freem(m); 120 else 121 sorwakeup(last); 122 } else { 123 m_freem(m); 124 ipstat.ips_noproto++; 125 ipstat.ips_delivered--; 126 } 127 } 128 129 /* 130 * Generate IP header and pass packet to ip_output. 131 * Tack on options user may have setup with control call. 132 */ 133 int 134 rip_output(m, so, dst) 135 register struct mbuf *m; 136 struct socket *so; 137 u_long dst; 138 { 139 register struct ip *ip; 140 register struct inpcb *inp = sotoinpcb(so); 141 struct mbuf *opts; 142 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 143 144 /* 145 * If the user handed us a complete IP packet, use it. 146 * Otherwise, allocate an mbuf for a header and fill it in. 147 */ 148 if ((inp->inp_flags & INP_HDRINCL) == 0) { 149 M_PREPEND(m, sizeof(struct ip), M_WAIT); 150 ip = mtod(m, struct ip *); 151 ip->ip_tos = 0; 152 ip->ip_off = 0; 153 ip->ip_p = inp->inp_ip.ip_p; 154 ip->ip_len = m->m_pkthdr.len; 155 ip->ip_src = inp->inp_laddr; 156 ip->ip_dst.s_addr = dst; 157 ip->ip_ttl = MAXTTL; 158 opts = inp->inp_options; 159 } else { 160 ip = mtod(m, struct ip *); 161 if (ip->ip_id == 0) 162 ip->ip_id = htons(ip_id++); 163 opts = NULL; 164 /* XXX prevent ip_output from overwriting header fields */ 165 flags |= IP_RAWOUTPUT; 166 ipstat.ips_rawout++; 167 } 168 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 169 } 170 171 /* 172 * Raw IP socket option processing. 173 */ 174 int 175 rip_ctloutput(op, so, level, optname, m) 176 int op; 177 struct socket *so; 178 int level, optname; 179 struct mbuf **m; 180 { 181 register struct inpcb *inp = sotoinpcb(so); 182 register int error; 183 184 if (level != IPPROTO_IP) 185 return (EINVAL); 186 187 switch (optname) { 188 189 case IP_HDRINCL: 190 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 191 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 192 return (EINVAL); 193 if (op == PRCO_SETOPT) { 194 if (*mtod(*m, int *)) 195 inp->inp_flags |= INP_HDRINCL; 196 else 197 inp->inp_flags &= ~INP_HDRINCL; 198 (void)m_free(*m); 199 } else { 200 (*m)->m_len = sizeof (int); 201 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 202 } 203 return (0); 204 } 205 break; 206 207 case DVMRP_INIT: 208 case DVMRP_DONE: 209 case DVMRP_ADD_VIF: 210 case DVMRP_DEL_VIF: 211 case DVMRP_ADD_LGRP: 212 case DVMRP_DEL_LGRP: 213 case DVMRP_ADD_MRT: 214 case DVMRP_DEL_MRT: 215 #ifdef MROUTING 216 if (op == PRCO_SETOPT) { 217 error = ip_mrouter_cmd(optname, so, *m); 218 if (*m) 219 (void)m_free(*m); 220 } else 221 error = EINVAL; 222 return (error); 223 #else 224 if (op == PRCO_SETOPT && *m) 225 (void)m_free(*m); 226 return (EOPNOTSUPP); 227 #endif 228 } 229 return (ip_ctloutput(op, so, level, optname, m)); 230 } 231 232 u_long rip_sendspace = RIPSNDQ; 233 u_long rip_recvspace = RIPRCVQ; 234 235 /*ARGSUSED*/ 236 int 237 rip_usrreq(so, req, m, nam, control) 238 register struct socket *so; 239 int req; 240 struct mbuf *m, *nam, *control; 241 { 242 register int error = 0; 243 register struct inpcb *inp = sotoinpcb(so); 244 #ifdef MROUTING 245 extern struct socket *ip_mrouter; 246 #endif 247 switch (req) { 248 249 case PRU_ATTACH: 250 if (inp) 251 panic("rip_attach"); 252 if ((so->so_state & SS_PRIV) == 0) { 253 error = EACCES; 254 break; 255 } 256 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 257 (error = in_pcballoc(so, &rawinpcb))) 258 break; 259 inp = (struct inpcb *)so->so_pcb; 260 inp->inp_ip.ip_p = (int)nam; 261 break; 262 263 case PRU_DISCONNECT: 264 if ((so->so_state & SS_ISCONNECTED) == 0) { 265 error = ENOTCONN; 266 break; 267 } 268 /* FALLTHROUGH */ 269 case PRU_ABORT: 270 soisdisconnected(so); 271 /* FALLTHROUGH */ 272 case PRU_DETACH: 273 if (inp == 0) 274 panic("rip_detach"); 275 #ifdef MROUTING 276 if (so == ip_mrouter) 277 ip_mrouter_done(); 278 #endif 279 in_pcbdetach(inp); 280 break; 281 282 case PRU_BIND: 283 { 284 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 285 286 if (nam->m_len != sizeof(*addr)) { 287 error = EINVAL; 288 break; 289 } 290 if ((ifnet == 0) || 291 ((addr->sin_family != AF_INET) && 292 (addr->sin_family != AF_IMPLINK)) || 293 (addr->sin_addr.s_addr && 294 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 295 error = EADDRNOTAVAIL; 296 break; 297 } 298 inp->inp_laddr = addr->sin_addr; 299 break; 300 } 301 case PRU_CONNECT: 302 { 303 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 304 305 if (nam->m_len != sizeof(*addr)) { 306 error = EINVAL; 307 break; 308 } 309 if (ifnet == 0) { 310 error = EADDRNOTAVAIL; 311 break; 312 } 313 if ((addr->sin_family != AF_INET) && 314 (addr->sin_family != AF_IMPLINK)) { 315 error = EAFNOSUPPORT; 316 break; 317 } 318 inp->inp_faddr = addr->sin_addr; 319 soisconnected(so); 320 break; 321 } 322 323 case PRU_CONNECT2: 324 error = EOPNOTSUPP; 325 break; 326 327 /* 328 * Mark the connection as being incapable of further input. 329 */ 330 case PRU_SHUTDOWN: 331 socantsendmore(so); 332 break; 333 334 /* 335 * Ship a packet out. The appropriate raw output 336 * routine handles any massaging necessary. 337 */ 338 case PRU_SEND: 339 { 340 register u_long dst; 341 342 if (so->so_state & SS_ISCONNECTED) { 343 if (nam) { 344 error = EISCONN; 345 break; 346 } 347 dst = inp->inp_faddr.s_addr; 348 } else { 349 if (nam == NULL) { 350 error = ENOTCONN; 351 break; 352 } 353 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 354 } 355 error = rip_output(m, so, dst); 356 m = NULL; 357 break; 358 } 359 360 case PRU_SENSE: 361 /* 362 * stat: don't bother with a blocksize. 363 */ 364 return (0); 365 366 /* 367 * Not supported. 368 */ 369 case PRU_RCVOOB: 370 case PRU_RCVD: 371 case PRU_LISTEN: 372 case PRU_ACCEPT: 373 case PRU_SENDOOB: 374 error = EOPNOTSUPP; 375 break; 376 377 case PRU_SOCKADDR: 378 in_setsockaddr(inp, nam); 379 break; 380 381 case PRU_PEERADDR: 382 in_setpeeraddr(inp, nam); 383 break; 384 385 default: 386 panic("rip_usrreq"); 387 } 388 if (m != NULL) 389 m_freem(m); 390 return (error); 391 } 392
Indexes created Mon Sep 29 21:09:56 GMT 2025