raw_ip.c revision 3969
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 1.5 1994/10/02 17:48:42 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 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#ifdef IPFIREWALL 57#include <netinet/ip_fw.h> 58#endif 59 60struct inpcb rawinpcb; 61 62/* 63 * Nominal space allocated to a raw ip socket. 64 */ 65#define RIPSNDQ 8192 66#define RIPRCVQ 8192 67 68/* 69 * Raw interface to IP protocol. 70 */ 71 72/* 73 * Initialize raw connection block q. 74 */ 75void 76rip_init() 77{ 78 79 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 80} 81 82struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 83/* 84 * Setup generic address and protocol structures 85 * for raw_input routine, then pass them along with 86 * mbuf chain. 87 */ 88void 89rip_input(m) 90 struct mbuf *m; 91{ 92 register struct ip *ip = mtod(m, struct ip *); 93 register struct inpcb *inp; 94 struct socket *last = 0; 95 96 ripsrc.sin_addr = ip->ip_src; 97 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 98 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 99 continue; 100 if (inp->inp_laddr.s_addr && 101 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 102 continue; 103 if (inp->inp_faddr.s_addr && 104 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 105 continue; 106 if (last) { 107 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 108 if (n) { 109 if (sbappendaddr(&last->so_rcv, 110 (struct sockaddr *)&ripsrc, n, 111 (struct mbuf *)0) == 0) 112 /* should notify about lost packet */ 113 m_freem(n); 114 else 115 sorwakeup(last); 116 } 117 } 118 last = inp->inp_socket; 119 } 120 if (last) { 121 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 122 m, (struct mbuf *)0) == 0) 123 m_freem(m); 124 else 125 sorwakeup(last); 126 } else { 127 m_freem(m); 128 ipstat.ips_noproto++; 129 ipstat.ips_delivered--; 130 } 131} 132 133/* 134 * Generate IP header and pass packet to ip_output. 135 * Tack on options user may have setup with control call. 136 */ 137int 138rip_output(m, so, dst) 139 register struct mbuf *m; 140 struct socket *so; 141 u_long dst; 142{ 143 register struct ip *ip; 144 register struct inpcb *inp = sotoinpcb(so); 145 struct mbuf *opts; 146 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 147 148 /* 149 * If the user handed us a complete IP packet, use it. 150 * Otherwise, allocate an mbuf for a header and fill it in. 151 */ 152 if ((inp->inp_flags & INP_HDRINCL) == 0) { 153 M_PREPEND(m, sizeof(struct ip), M_WAIT); 154 ip = mtod(m, struct ip *); 155 ip->ip_tos = 0; 156 ip->ip_off = 0; 157 ip->ip_p = inp->inp_ip.ip_p; 158 ip->ip_len = m->m_pkthdr.len; 159 ip->ip_src = inp->inp_laddr; 160 ip->ip_dst.s_addr = dst; 161 ip->ip_ttl = MAXTTL; 162 opts = inp->inp_options; 163 } else { 164 ip = mtod(m, struct ip *); 165 if (ip->ip_id == 0) 166 ip->ip_id = htons(ip_id++); 167 opts = NULL; 168 /* XXX prevent ip_output from overwriting header fields */ 169 flags |= IP_RAWOUTPUT; 170 ipstat.ips_rawout++; 171 } 172 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 173} 174 175/* 176 * Raw IP socket option processing. 177 */ 178int 179rip_ctloutput(op, so, level, optname, m) 180 int op; 181 struct socket *so; 182 int level, optname; 183 struct mbuf **m; 184{ 185 register struct inpcb *inp = sotoinpcb(so); 186 register int error; 187 188 if (level != IPPROTO_IP) 189 return (EINVAL); 190 191 switch (optname) { 192 193 case IP_HDRINCL: 194 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 195 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 196 return (EINVAL); 197 if (op == PRCO_SETOPT) { 198 if (*mtod(*m, int *)) 199 inp->inp_flags |= INP_HDRINCL; 200 else 201 inp->inp_flags &= ~INP_HDRINCL; 202 (void)m_free(*m); 203 } else { 204 (*m)->m_len = sizeof (int); 205 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 206 } 207 return (0); 208 } 209 break; 210 211#ifdef IPFIREWALL 212 case IP_FW_ADD_BLK: 213 case IP_FW_ADD_FWD: 214 case IP_FW_CHK_BLK: 215 case IP_FW_CHK_FWD: 216 case IP_FW_DEL_BLK: 217 case IP_FW_DEL_FWD: 218 case IP_FW_FLUSH: 219 case IP_FW_POLICY: 220 221 if (op == PRCO_SETOPT) 222 error=ip_firewall_ctl(optname, *m); 223 else 224 error=EINVAL; 225 return(error); 226#endif 227 228 229 case IP_RSVP_ON: 230 error = ip_rsvp_init(so); 231 break; 232 233 case IP_RSVP_OFF: 234 error = ip_rsvp_done(); 235 break; 236 237 case DVMRP_INIT: 238 case DVMRP_DONE: 239 case DVMRP_ADD_VIF: 240 case DVMRP_DEL_VIF: 241 case DVMRP_ADD_MFC: 242 case DVMRP_DEL_MFC: 243 if (op == PRCO_SETOPT) { 244 error = ip_mrouter_cmd(optname, so, *m); 245 if (*m) 246 (void)m_free(*m); 247 } else 248 error = EINVAL; 249 return (error); 250 } 251 return (ip_ctloutput(op, so, level, optname, m)); 252} 253 254u_long rip_sendspace = RIPSNDQ; 255u_long rip_recvspace = RIPRCVQ; 256 257/*ARGSUSED*/ 258int 259rip_usrreq(so, req, m, nam, control) 260 register struct socket *so; 261 int req; 262 struct mbuf *m, *nam, *control; 263{ 264 register int error = 0; 265 register struct inpcb *inp = sotoinpcb(so); 266 switch (req) { 267 268 case PRU_ATTACH: 269 if (inp) 270 panic("rip_attach"); 271 if ((so->so_state & SS_PRIV) == 0) { 272 error = EACCES; 273 break; 274 } 275 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 276 (error = in_pcballoc(so, &rawinpcb))) 277 break; 278 inp = (struct inpcb *)so->so_pcb; 279 inp->inp_ip.ip_p = (int)nam; 280 break; 281 282 case PRU_DISCONNECT: 283 if ((so->so_state & SS_ISCONNECTED) == 0) { 284 error = ENOTCONN; 285 break; 286 } 287 /* FALLTHROUGH */ 288 case PRU_ABORT: 289 soisdisconnected(so); 290 /* FALLTHROUGH */ 291 case PRU_DETACH: 292 if (inp == 0) 293 panic("rip_detach"); 294 if (so == ip_mrouter) 295 ip_mrouter_done(); 296 in_pcbdetach(inp); 297 break; 298 299 case PRU_BIND: 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 ((addr->sin_family != AF_INET) && 309 (addr->sin_family != AF_IMPLINK)) || 310 (addr->sin_addr.s_addr && 311 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 312 error = EADDRNOTAVAIL; 313 break; 314 } 315 inp->inp_laddr = addr->sin_addr; 316 break; 317 } 318 case PRU_CONNECT: 319 { 320 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 321 322 if (nam->m_len != sizeof(*addr)) { 323 error = EINVAL; 324 break; 325 } 326 if (ifnet == 0) { 327 error = EADDRNOTAVAIL; 328 break; 329 } 330 if ((addr->sin_family != AF_INET) && 331 (addr->sin_family != AF_IMPLINK)) { 332 error = EAFNOSUPPORT; 333 break; 334 } 335 inp->inp_faddr = addr->sin_addr; 336 soisconnected(so); 337 break; 338 } 339 340 case PRU_CONNECT2: 341 error = EOPNOTSUPP; 342 break; 343 344 /* 345 * Mark the connection as being incapable of further input. 346 */ 347 case PRU_SHUTDOWN: 348 socantsendmore(so); 349 break; 350 351 /* 352 * Ship a packet out. The appropriate raw output 353 * routine handles any massaging necessary. 354 */ 355 case PRU_SEND: 356 { 357 register u_long dst; 358 359 if (so->so_state & SS_ISCONNECTED) { 360 if (nam) { 361 error = EISCONN; 362 break; 363 } 364 dst = inp->inp_faddr.s_addr; 365 } else { 366 if (nam == NULL) { 367 error = ENOTCONN; 368 break; 369 } 370 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 371 } 372 error = rip_output(m, so, dst); 373 m = NULL; 374 break; 375 } 376 377 case PRU_SENSE: 378 /* 379 * stat: don't bother with a blocksize. 380 */ 381 return (0); 382 383 /* 384 * Not supported. 385 */ 386 case PRU_RCVOOB: 387 case PRU_RCVD: 388 case PRU_LISTEN: 389 case PRU_ACCEPT: 390 case PRU_SENDOOB: 391 error = EOPNOTSUPP; 392 break; 393 394 case PRU_SOCKADDR: 395 in_setsockaddr(inp, nam); 396 break; 397 398 case PRU_PEERADDR: 399 in_setpeeraddr(inp, nam); 400 break; 401 402 default: 403 panic("rip_usrreq"); 404 } 405 if (m != NULL) 406 m_freem(m); 407 return (error); 408} 409