raw_ip.c revision 2531
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 * $Id: raw_ip.c,v 1.2 1994/08/02 07:48:49 davidg 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 56struct 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 */ 71void 72rip_init() 73{ 74 75 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 76} 77 78struct 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 */ 84void 85rip_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, &ripsrc, 106 n, (struct mbuf *)0) == 0) 107 /* should notify about lost packet */ 108 m_freem(n); 109 else 110 sorwakeup(last); 111 } 112 } 113 last = inp->inp_socket; 114 } 115 if (last) { 116 if (sbappendaddr(&last->so_rcv, &ripsrc, 117 m, (struct mbuf *)0) == 0) 118 m_freem(m); 119 else 120 sorwakeup(last); 121 } else { 122 m_freem(m); 123 ipstat.ips_noproto++; 124 ipstat.ips_delivered--; 125 } 126} 127 128/* 129 * Generate IP header and pass packet to ip_output. 130 * Tack on options user may have setup with control call. 131 */ 132int 133rip_output(m, so, dst) 134 register struct mbuf *m; 135 struct socket *so; 136 u_long dst; 137{ 138 register struct ip *ip; 139 register struct inpcb *inp = sotoinpcb(so); 140 struct mbuf *opts; 141 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 142 143 /* 144 * If the user handed us a complete IP packet, use it. 145 * Otherwise, allocate an mbuf for a header and fill it in. 146 */ 147 if ((inp->inp_flags & INP_HDRINCL) == 0) { 148 M_PREPEND(m, sizeof(struct ip), M_WAIT); 149 ip = mtod(m, struct ip *); 150 ip->ip_tos = 0; 151 ip->ip_off = 0; 152 ip->ip_p = inp->inp_ip.ip_p; 153 ip->ip_len = m->m_pkthdr.len; 154 ip->ip_src = inp->inp_laddr; 155 ip->ip_dst.s_addr = dst; 156 ip->ip_ttl = MAXTTL; 157 opts = inp->inp_options; 158 } else { 159 ip = mtod(m, struct ip *); 160 if (ip->ip_id == 0) 161 ip->ip_id = htons(ip_id++); 162 opts = NULL; 163 /* XXX prevent ip_output from overwriting header fields */ 164 flags |= IP_RAWOUTPUT; 165 ipstat.ips_rawout++; 166 } 167 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 168} 169 170/* 171 * Raw IP socket option processing. 172 */ 173int 174rip_ctloutput(op, so, level, optname, m) 175 int op; 176 struct socket *so; 177 int level, optname; 178 struct mbuf **m; 179{ 180 register struct inpcb *inp = sotoinpcb(so); 181 register int error; 182 183 if (level != IPPROTO_IP) 184 return (EINVAL); 185 186 switch (optname) { 187 188 case IP_HDRINCL: 189 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 190 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 191 return (EINVAL); 192 if (op == PRCO_SETOPT) { 193 if (*mtod(*m, int *)) 194 inp->inp_flags |= INP_HDRINCL; 195 else 196 inp->inp_flags &= ~INP_HDRINCL; 197 (void)m_free(*m); 198 } else { 199 (*m)->m_len = sizeof (int); 200 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 201 } 202 return (0); 203 } 204 break; 205 206 case IP_RSVP_ON: 207 error = ip_rsvp_init(so); 208 break; 209 210 case IP_RSVP_OFF: 211 error = ip_rsvp_done(); 212 break; 213 214 case DVMRP_INIT: 215 case DVMRP_DONE: 216 case DVMRP_ADD_VIF: 217 case DVMRP_DEL_VIF: 218 case DVMRP_ADD_MFC: 219 case DVMRP_DEL_MFC: 220#ifdef MROUTING 221 if (op == PRCO_SETOPT) { 222 error = ip_mrouter_cmd(optname, so, *m); 223 if (*m) 224 (void)m_free(*m); 225 } else 226 error = EINVAL; 227 return (error); 228#else 229 if (op == PRCO_SETOPT && *m) 230 (void)m_free(*m); 231 return (EOPNOTSUPP); 232#endif 233 } 234 return (ip_ctloutput(op, so, level, optname, m)); 235} 236 237u_long rip_sendspace = RIPSNDQ; 238u_long rip_recvspace = RIPRCVQ; 239 240/*ARGSUSED*/ 241int 242rip_usrreq(so, req, m, nam, control) 243 register struct socket *so; 244 int req; 245 struct mbuf *m, *nam, *control; 246{ 247 register int error = 0; 248 register struct inpcb *inp = sotoinpcb(so); 249 switch (req) { 250 251 case PRU_ATTACH: 252 if (inp) 253 panic("rip_attach"); 254 if ((so->so_state & SS_PRIV) == 0) { 255 error = EACCES; 256 break; 257 } 258 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 259 (error = in_pcballoc(so, &rawinpcb))) 260 break; 261 inp = (struct inpcb *)so->so_pcb; 262 inp->inp_ip.ip_p = (int)nam; 263 break; 264 265 case PRU_DISCONNECT: 266 if ((so->so_state & SS_ISCONNECTED) == 0) { 267 error = ENOTCONN; 268 break; 269 } 270 /* FALLTHROUGH */ 271 case PRU_ABORT: 272 soisdisconnected(so); 273 /* FALLTHROUGH */ 274 case PRU_DETACH: 275 if (inp == 0) 276 panic("rip_detach"); 277#ifdef MROUTING 278 if (so == ip_mrouter) 279 ip_mrouter_done(); 280#endif 281 in_pcbdetach(inp); 282 break; 283 284 case PRU_BIND: 285 { 286 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 287 288 if (nam->m_len != sizeof(*addr)) { 289 error = EINVAL; 290 break; 291 } 292 if ((ifnet == 0) || 293 ((addr->sin_family != AF_INET) && 294 (addr->sin_family != AF_IMPLINK)) || 295 (addr->sin_addr.s_addr && 296 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 297 error = EADDRNOTAVAIL; 298 break; 299 } 300 inp->inp_laddr = addr->sin_addr; 301 break; 302 } 303 case PRU_CONNECT: 304 { 305 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 306 307 if (nam->m_len != sizeof(*addr)) { 308 error = EINVAL; 309 break; 310 } 311 if (ifnet == 0) { 312 error = EADDRNOTAVAIL; 313 break; 314 } 315 if ((addr->sin_family != AF_INET) && 316 (addr->sin_family != AF_IMPLINK)) { 317 error = EAFNOSUPPORT; 318 break; 319 } 320 inp->inp_faddr = addr->sin_addr; 321 soisconnected(so); 322 break; 323 } 324 325 case PRU_CONNECT2: 326 error = EOPNOTSUPP; 327 break; 328 329 /* 330 * Mark the connection as being incapable of further input. 331 */ 332 case PRU_SHUTDOWN: 333 socantsendmore(so); 334 break; 335 336 /* 337 * Ship a packet out. The appropriate raw output 338 * routine handles any massaging necessary. 339 */ 340 case PRU_SEND: 341 { 342 register u_long dst; 343 344 if (so->so_state & SS_ISCONNECTED) { 345 if (nam) { 346 error = EISCONN; 347 break; 348 } 349 dst = inp->inp_faddr.s_addr; 350 } else { 351 if (nam == NULL) { 352 error = ENOTCONN; 353 break; 354 } 355 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 356 } 357 error = rip_output(m, so, dst); 358 m = NULL; 359 break; 360 } 361 362 case PRU_SENSE: 363 /* 364 * stat: don't bother with a blocksize. 365 */ 366 return (0); 367 368 /* 369 * Not supported. 370 */ 371 case PRU_RCVOOB: 372 case PRU_RCVD: 373 case PRU_LISTEN: 374 case PRU_ACCEPT: 375 case PRU_SENDOOB: 376 error = EOPNOTSUPP; 377 break; 378 379 case PRU_SOCKADDR: 380 in_setsockaddr(inp, nam); 381 break; 382 383 case PRU_PEERADDR: 384 in_setpeeraddr(inp, nam); 385 break; 386 387 default: 388 panic("rip_usrreq"); 389 } 390 if (m != NULL) 391 m_freem(m); 392 return (error); 393} 394