raw_ip.c revision 1541
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 8.2 (Berkeley) 1/4/94 34 */ 35 36#include <sys/param.h> 37#include <sys/malloc.h> 38#include <sys/mbuf.h> 39#include <sys/socket.h> 40#include <sys/protosw.h> 41#include <sys/socketvar.h> 42#include <sys/errno.h> 43#include <sys/systm.h> 44 45#include <net/if.h> 46#include <net/route.h> 47 48#include <netinet/in.h> 49#include <netinet/in_systm.h> 50#include <netinet/ip.h> 51#include <netinet/ip_var.h> 52#include <netinet/ip_mroute.h> 53#include <netinet/in_pcb.h> 54 55struct inpcb rawinpcb; 56 57/* 58 * Nominal space allocated to a raw ip socket. 59 */ 60#define RIPSNDQ 8192 61#define RIPRCVQ 8192 62 63/* 64 * Raw interface to IP protocol. 65 */ 66 67/* 68 * Initialize raw connection block q. 69 */ 70void 71rip_init() 72{ 73 74 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 75} 76 77struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 78/* 79 * Setup generic address and protocol structures 80 * for raw_input routine, then pass them along with 81 * mbuf chain. 82 */ 83void 84rip_input(m) 85 struct mbuf *m; 86{ 87 register struct ip *ip = mtod(m, struct ip *); 88 register struct inpcb *inp; 89 struct socket *last = 0; 90 91 ripsrc.sin_addr = ip->ip_src; 92 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 93 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 94 continue; 95 if (inp->inp_laddr.s_addr && 96 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 97 continue; 98 if (inp->inp_faddr.s_addr && 99 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 100 continue; 101 if (last) { 102 struct mbuf *n; 103 if (n = m_copy(m, 0, (int)M_COPYALL)) { 104 if (sbappendaddr(&last->so_rcv, &ripsrc, 105 n, (struct mbuf *)0) == 0) 106 /* should notify about lost packet */ 107 m_freem(n); 108 else 109 sorwakeup(last); 110 } 111 } 112 last = inp->inp_socket; 113 } 114 if (last) { 115 if (sbappendaddr(&last->so_rcv, &ripsrc, 116 m, (struct mbuf *)0) == 0) 117 m_freem(m); 118 else 119 sorwakeup(last); 120 } else { 121 m_freem(m); 122 ipstat.ips_noproto++; 123 ipstat.ips_delivered--; 124 } 125} 126 127/* 128 * Generate IP header and pass packet to ip_output. 129 * Tack on options user may have setup with control call. 130 */ 131int 132rip_output(m, so, dst) 133 register struct mbuf *m; 134 struct socket *so; 135 u_long dst; 136{ 137 register struct ip *ip; 138 register struct inpcb *inp = sotoinpcb(so); 139 struct mbuf *opts; 140 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 141 142 /* 143 * If the user handed us a complete IP packet, use it. 144 * Otherwise, allocate an mbuf for a header and fill it in. 145 */ 146 if ((inp->inp_flags & INP_HDRINCL) == 0) { 147 M_PREPEND(m, sizeof(struct ip), M_WAIT); 148 ip = mtod(m, struct ip *); 149 ip->ip_tos = 0; 150 ip->ip_off = 0; 151 ip->ip_p = inp->inp_ip.ip_p; 152 ip->ip_len = m->m_pkthdr.len; 153 ip->ip_src = inp->inp_laddr; 154 ip->ip_dst.s_addr = dst; 155 ip->ip_ttl = MAXTTL; 156 opts = inp->inp_options; 157 } else { 158 ip = mtod(m, struct ip *); 159 if (ip->ip_id == 0) 160 ip->ip_id = htons(ip_id++); 161 opts = NULL; 162 /* XXX prevent ip_output from overwriting header fields */ 163 flags |= IP_RAWOUTPUT; 164 ipstat.ips_rawout++; 165 } 166 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 167} 168 169/* 170 * Raw IP socket option processing. 171 */ 172int 173rip_ctloutput(op, so, level, optname, m) 174 int op; 175 struct socket *so; 176 int level, optname; 177 struct mbuf **m; 178{ 179 register struct inpcb *inp = sotoinpcb(so); 180 register int error; 181 182 if (level != IPPROTO_IP) 183 return (EINVAL); 184 185 switch (optname) { 186 187 case IP_HDRINCL: 188 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 189 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 190 return (EINVAL); 191 if (op == PRCO_SETOPT) { 192 if (*mtod(*m, int *)) 193 inp->inp_flags |= INP_HDRINCL; 194 else 195 inp->inp_flags &= ~INP_HDRINCL; 196 (void)m_free(*m); 197 } else { 198 (*m)->m_len = sizeof (int); 199 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 200 } 201 return (0); 202 } 203 break; 204 205 case DVMRP_INIT: 206 case DVMRP_DONE: 207 case DVMRP_ADD_VIF: 208 case DVMRP_DEL_VIF: 209 case DVMRP_ADD_LGRP: 210 case DVMRP_DEL_LGRP: 211 case DVMRP_ADD_MRT: 212 case DVMRP_DEL_MRT: 213#ifdef MROUTING 214 if (op == PRCO_SETOPT) { 215 error = ip_mrouter_cmd(optname, so, *m); 216 if (*m) 217 (void)m_free(*m); 218 } else 219 error = EINVAL; 220 return (error); 221#else 222 if (op == PRCO_SETOPT && *m) 223 (void)m_free(*m); 224 return (EOPNOTSUPP); 225#endif 226 } 227 return (ip_ctloutput(op, so, level, optname, m)); 228} 229 230u_long rip_sendspace = RIPSNDQ; 231u_long rip_recvspace = RIPRCVQ; 232 233/*ARGSUSED*/ 234int 235rip_usrreq(so, req, m, nam, control) 236 register struct socket *so; 237 int req; 238 struct mbuf *m, *nam, *control; 239{ 240 register int error = 0; 241 register struct inpcb *inp = sotoinpcb(so); 242#ifdef MROUTING 243 extern struct socket *ip_mrouter; 244#endif 245 switch (req) { 246 247 case PRU_ATTACH: 248 if (inp) 249 panic("rip_attach"); 250 if ((so->so_state & SS_PRIV) == 0) { 251 error = EACCES; 252 break; 253 } 254 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 255 (error = in_pcballoc(so, &rawinpcb))) 256 break; 257 inp = (struct inpcb *)so->so_pcb; 258 inp->inp_ip.ip_p = (int)nam; 259 break; 260 261 case PRU_DISCONNECT: 262 if ((so->so_state & SS_ISCONNECTED) == 0) { 263 error = ENOTCONN; 264 break; 265 } 266 /* FALLTHROUGH */ 267 case PRU_ABORT: 268 soisdisconnected(so); 269 /* FALLTHROUGH */ 270 case PRU_DETACH: 271 if (inp == 0) 272 panic("rip_detach"); 273#ifdef MROUTING 274 if (so == ip_mrouter) 275 ip_mrouter_done(); 276#endif 277 in_pcbdetach(inp); 278 break; 279 280 case PRU_BIND: 281 { 282 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 283 284 if (nam->m_len != sizeof(*addr)) { 285 error = EINVAL; 286 break; 287 } 288 if ((ifnet == 0) || 289 ((addr->sin_family != AF_INET) && 290 (addr->sin_family != AF_IMPLINK)) || 291 (addr->sin_addr.s_addr && 292 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 293 error = EADDRNOTAVAIL; 294 break; 295 } 296 inp->inp_laddr = addr->sin_addr; 297 break; 298 } 299 case PRU_CONNECT: 300 { 301 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 302 303 if (nam->m_len != sizeof(*addr)) { 304 error = EINVAL; 305 break; 306 } 307 if (ifnet == 0) { 308 error = EADDRNOTAVAIL; 309 break; 310 } 311 if ((addr->sin_family != AF_INET) && 312 (addr->sin_family != AF_IMPLINK)) { 313 error = EAFNOSUPPORT; 314 break; 315 } 316 inp->inp_faddr = addr->sin_addr; 317 soisconnected(so); 318 break; 319 } 320 321 case PRU_CONNECT2: 322 error = EOPNOTSUPP; 323 break; 324 325 /* 326 * Mark the connection as being incapable of further input. 327 */ 328 case PRU_SHUTDOWN: 329 socantsendmore(so); 330 break; 331 332 /* 333 * Ship a packet out. The appropriate raw output 334 * routine handles any massaging necessary. 335 */ 336 case PRU_SEND: 337 { 338 register u_long dst; 339 340 if (so->so_state & SS_ISCONNECTED) { 341 if (nam) { 342 error = EISCONN; 343 break; 344 } 345 dst = inp->inp_faddr.s_addr; 346 } else { 347 if (nam == NULL) { 348 error = ENOTCONN; 349 break; 350 } 351 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 352 } 353 error = rip_output(m, so, dst); 354 m = NULL; 355 break; 356 } 357 358 case PRU_SENSE: 359 /* 360 * stat: don't bother with a blocksize. 361 */ 362 return (0); 363 364 /* 365 * Not supported. 366 */ 367 case PRU_RCVOOB: 368 case PRU_RCVD: 369 case PRU_LISTEN: 370 case PRU_ACCEPT: 371 case PRU_SENDOOB: 372 error = EOPNOTSUPP; 373 break; 374 375 case PRU_SOCKADDR: 376 in_setsockaddr(inp, nam); 377 break; 378 379 case PRU_PEERADDR: 380 in_setpeeraddr(inp, nam); 381 break; 382 383 default: 384 panic("rip_usrreq"); 385 } 386 if (m != NULL) 387 m_freem(m); 388 return (error); 389} 390