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 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 34 * $Id: raw_ip.c,v 1.26 1996/02/23 15:47:58 phk 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 #include <sys/queue.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/in_pcb.h> 54 #include <netinet/in_var.h> 55 #include <netinet/ip_var.h> 56 #include <netinet/ip_mroute.h> 57 58 #include <netinet/ip_fw.h> 59 60 static struct inpcbhead ripcb; 61 static struct inpcbinfo ripcbinfo; 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 LIST_INIT(&ripcb); 80 ripcbinfo.listhead = &ripcb; 81 /* 82 * XXX We don't use the hash list for raw IP, but it's easier 83 * to allocate a one entry hash list than it is to check all 84 * over the place for hashbase == NULL. 85 */ 86 ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize); 87 } 88 89 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 90 /* 91 * Setup generic address and protocol structures 92 * for raw_input routine, then pass them along with 93 * mbuf chain. 94 */ 95 void 96 rip_input(m) 97 struct mbuf *m; 98 { 99 register struct ip *ip = mtod(m, struct ip *); 100 register struct inpcb *inp; 101 struct socket *last = 0; 102 103 ripsrc.sin_addr = ip->ip_src; 104 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 105 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 106 continue; 107 if (inp->inp_laddr.s_addr && 108 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 109 continue; 110 if (inp->inp_faddr.s_addr && 111 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 112 continue; 113 if (last) { 114 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 115 if (n) { 116 if (sbappendaddr(&last->so_rcv, 117 (struct sockaddr *)&ripsrc, n, 118 (struct mbuf *)0) == 0) 119 /* should notify about lost packet */ 120 m_freem(n); 121 else 122 sorwakeup(last); 123 } 124 } 125 last = inp->inp_socket; 126 } 127 if (last) { 128 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 129 m, (struct mbuf *)0) == 0) 130 m_freem(m); 131 else 132 sorwakeup(last); 133 } else { 134 m_freem(m); 135 ipstat.ips_noproto++; 136 ipstat.ips_delivered--; 137 } 138 } 139 140 /* 141 * Generate IP header and pass packet to ip_output. 142 * Tack on options user may have setup with control call. 143 */ 144 int 145 rip_output(m, so, dst) 146 register struct mbuf *m; 147 struct socket *so; 148 u_long dst; 149 { 150 register struct ip *ip; 151 register struct inpcb *inp = sotoinpcb(so); 152 struct mbuf *opts; 153 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 154 155 /* 156 * If the user handed us a complete IP packet, use it. 157 * Otherwise, allocate an mbuf for a header and fill it in. 158 */ 159 if ((inp->inp_flags & INP_HDRINCL) == 0) { 160 M_PREPEND(m, sizeof(struct ip), M_WAIT); 161 ip = mtod(m, struct ip *); 162 ip->ip_tos = 0; 163 ip->ip_off = 0; 164 ip->ip_p = inp->inp_ip.ip_p; 165 ip->ip_len = m->m_pkthdr.len; 166 ip->ip_src = inp->inp_laddr; 167 ip->ip_dst.s_addr = dst; 168 ip->ip_ttl = MAXTTL; 169 opts = inp->inp_options; 170 } else { 171 ip = mtod(m, struct ip *); 172 if (ip->ip_id == 0) 173 ip->ip_id = htons(ip_id++); 174 opts = NULL; 175 /* XXX prevent ip_output from overwriting header fields */ 176 flags |= IP_RAWOUTPUT; 177 ipstat.ips_rawout++; 178 } 179 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 180 } 181 182 /* 183 * Raw IP socket option processing. 184 */ 185 int 186 rip_ctloutput(op, so, level, optname, m) 187 int op; 188 struct socket *so; 189 int level, optname; 190 struct mbuf **m; 191 { 192 register struct inpcb *inp = sotoinpcb(so); 193 register int error; 194 195 if (level != IPPROTO_IP) { 196 if (op == PRCO_SETOPT && *m) 197 (void)m_free(*m); 198 return (EINVAL); 199 } 200 201 switch (optname) { 202 203 case IP_HDRINCL: 204 error = 0; 205 if (op == PRCO_SETOPT) { 206 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 207 error = EINVAL; 208 else if (*mtod(*m, int *)) 209 inp->inp_flags |= INP_HDRINCL; 210 else 211 inp->inp_flags &= ~INP_HDRINCL; 212 if (*m) 213 (void)m_free(*m); 214 } else { 215 *m = m_get(M_WAIT, MT_SOOPTS); 216 (*m)->m_len = sizeof (int); 217 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 218 } 219 return (error); 220 221 case IP_FW_GET: 222 if (ip_fw_ctl_ptr==NULL || op == PRCO_SETOPT) { 223 if (*m) (void)m_free(*m); 224 return(EINVAL); 225 } 226 return (*ip_fw_ctl_ptr)(optname, m); 227 case IP_FW_ADD: 228 case IP_FW_DEL: 229 case IP_FW_FLUSH: 230 case IP_FW_ZERO: 231 if (ip_fw_ctl_ptr==NULL || op != PRCO_SETOPT) { 232 if (*m) (void)m_free(*m); 233 return(EINVAL); 234 } 235 236 return (*ip_fw_ctl_ptr)(optname, m); 237 return(error); 238 239 case IP_RSVP_ON: 240 return ip_rsvp_init(so); 241 break; 242 243 case IP_RSVP_OFF: 244 return ip_rsvp_done(); 245 break; 246 247 case IP_RSVP_VIF_ON: 248 return ip_rsvp_vif_init(so, *m); 249 250 case IP_RSVP_VIF_OFF: 251 return ip_rsvp_vif_done(so, *m); 252 253 case MRT_INIT: 254 case MRT_DONE: 255 case MRT_ADD_VIF: 256 case MRT_DEL_VIF: 257 case MRT_ADD_MFC: 258 case MRT_DEL_MFC: 259 case MRT_VERSION: 260 case MRT_ASSERT: 261 if (op == PRCO_SETOPT) { 262 error = ip_mrouter_set(optname, so, *m); 263 if (*m) 264 (void)m_free(*m); 265 } else if (op == PRCO_GETOPT) { 266 error = ip_mrouter_get(optname, so, m); 267 } else 268 error = EINVAL; 269 return (error); 270 } 271 return (ip_ctloutput(op, so, level, optname, m)); 272 } 273 274 static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ 275 static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ 276 277 /*ARGSUSED*/ 278 int 279 rip_usrreq(so, req, m, nam, control) 280 register struct socket *so; 281 int req; 282 struct mbuf *m, *nam, *control; 283 { 284 register int error = 0; 285 register struct inpcb *inp = sotoinpcb(so); 286 287 if (req == PRU_CONTROL) 288 return (in_control(so, (u_long)m, (caddr_t)nam, 289 (struct ifnet *)control)); 290 291 switch (req) { 292 293 case PRU_ATTACH: 294 if (inp) 295 panic("rip_attach"); 296 if ((so->so_state & SS_PRIV) == 0) { 297 error = EACCES; 298 break; 299 } 300 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 301 (error = in_pcballoc(so, &ripcbinfo))) 302 break; 303 inp = (struct inpcb *)so->so_pcb; 304 inp->inp_ip.ip_p = (int)nam; 305 break; 306 307 case PRU_DISCONNECT: 308 if ((so->so_state & SS_ISCONNECTED) == 0) { 309 error = ENOTCONN; 310 break; 311 } 312 /* FALLTHROUGH */ 313 case PRU_ABORT: 314 soisdisconnected(so); 315 /* FALLTHROUGH */ 316 case PRU_DETACH: 317 if (inp == 0) 318 panic("rip_detach"); 319 if (so == ip_mrouter) 320 ip_mrouter_done(); 321 ip_rsvp_force_done(so); 322 if (so == ip_rsvpd) 323 ip_rsvp_done(); 324 in_pcbdetach(inp); 325 break; 326 327 case PRU_BIND: 328 { 329 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 330 331 if (nam->m_len != sizeof(*addr)) { 332 error = EINVAL; 333 break; 334 } 335 if ((ifnet == 0) || 336 ((addr->sin_family != AF_INET) && 337 (addr->sin_family != AF_IMPLINK)) || 338 (addr->sin_addr.s_addr && 339 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 340 error = EADDRNOTAVAIL; 341 break; 342 } 343 inp->inp_laddr = addr->sin_addr; 344 break; 345 } 346 case PRU_CONNECT: 347 { 348 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 349 350 if (nam->m_len != sizeof(*addr)) { 351 error = EINVAL; 352 break; 353 } 354 if (ifnet == 0) { 355 error = EADDRNOTAVAIL; 356 break; 357 } 358 if ((addr->sin_family != AF_INET) && 359 (addr->sin_family != AF_IMPLINK)) { 360 error = EAFNOSUPPORT; 361 break; 362 } 363 inp->inp_faddr = addr->sin_addr; 364 soisconnected(so); 365 break; 366 } 367 368 case PRU_CONNECT2: 369 error = EOPNOTSUPP; 370 break; 371 372 /* 373 * Mark the connection as being incapable of further input. 374 */ 375 case PRU_SHUTDOWN: 376 socantsendmore(so); 377 break; 378 379 /* 380 * Ship a packet out. The appropriate raw output 381 * routine handles any massaging necessary. 382 */ 383 case PRU_SEND: 384 { 385 register u_long dst; 386 387 if (so->so_state & SS_ISCONNECTED) { 388 if (nam) { 389 error = EISCONN; 390 break; 391 } 392 dst = inp->inp_faddr.s_addr; 393 } else { 394 if (nam == NULL) { 395 error = ENOTCONN; 396 break; 397 } 398 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 399 } 400 error = rip_output(m, so, dst); 401 m = NULL; 402 break; 403 } 404 405 case PRU_SENSE: 406 /* 407 * stat: don't bother with a blocksize. 408 */ 409 return (0); 410 411 /* 412 * Not supported. 413 */ 414 case PRU_RCVOOB: 415 case PRU_RCVD: 416 case PRU_LISTEN: 417 case PRU_ACCEPT: 418 case PRU_SENDOOB: 419 error = EOPNOTSUPP; 420 break; 421 422 case PRU_SOCKADDR: 423 in_setsockaddr(inp, nam); 424 break; 425 426 case PRU_PEERADDR: 427 in_setpeeraddr(inp, nam); 428 break; 429 430 default: 431 panic("rip_usrreq"); 432 } 433 if (m != NULL) 434 m_freem(m); 435 return (error); 436 } 437