raw_ip.c revision 6224
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 1.13 1995/01/26 18:59:02 wollman 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#include <netinet/ip_fw.h> 57 58struct inpcb rawinpcb; 59 60/* 61 * Nominal space allocated to a raw ip socket. 62 */ 63#define RIPSNDQ 8192 64#define RIPRCVQ 8192 65 66/* 67 * Raw interface to IP protocol. 68 */ 69 70/* 71 * Initialize raw connection block q. 72 */ 73void 74rip_init() 75{ 76 77 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 78} 79 80struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 81/* 82 * Setup generic address and protocol structures 83 * for raw_input routine, then pass them along with 84 * mbuf chain. 85 */ 86void 87rip_input(m) 88 struct mbuf *m; 89{ 90 register struct ip *ip = mtod(m, struct ip *); 91 register struct inpcb *inp; 92 struct socket *last = 0; 93 94 ripsrc.sin_addr = ip->ip_src; 95 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 96 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 97 continue; 98 if (inp->inp_laddr.s_addr && 99 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 100 continue; 101 if (inp->inp_faddr.s_addr && 102 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 103 continue; 104 if (last) { 105 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 106 if (n) { 107 if (sbappendaddr(&last->so_rcv, 108 (struct sockaddr *)&ripsrc, n, 109 (struct mbuf *)0) == 0) 110 /* should notify about lost packet */ 111 m_freem(n); 112 else 113 sorwakeup(last); 114 } 115 } 116 last = inp->inp_socket; 117 } 118 if (last) { 119 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 120 m, (struct mbuf *)0) == 0) 121 m_freem(m); 122 else 123 sorwakeup(last); 124 } else { 125 m_freem(m); 126 ipstat.ips_noproto++; 127 ipstat.ips_delivered--; 128 } 129} 130 131/* 132 * Generate IP header and pass packet to ip_output. 133 * Tack on options user may have setup with control call. 134 */ 135int 136rip_output(m, so, dst) 137 register struct mbuf *m; 138 struct socket *so; 139 u_long dst; 140{ 141 register struct ip *ip; 142 register struct inpcb *inp = sotoinpcb(so); 143 struct mbuf *opts; 144 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 145 146 /* 147 * If the user handed us a complete IP packet, use it. 148 * Otherwise, allocate an mbuf for a header and fill it in. 149 */ 150 if ((inp->inp_flags & INP_HDRINCL) == 0) { 151 M_PREPEND(m, sizeof(struct ip), M_WAIT); 152 ip = mtod(m, struct ip *); 153 ip->ip_tos = 0; 154 ip->ip_off = 0; 155 ip->ip_p = inp->inp_ip.ip_p; 156 ip->ip_len = m->m_pkthdr.len; 157 ip->ip_src = inp->inp_laddr; 158 ip->ip_dst.s_addr = dst; 159 ip->ip_ttl = MAXTTL; 160 opts = inp->inp_options; 161 } else { 162 ip = mtod(m, struct ip *); 163 if (ip->ip_id == 0) 164 ip->ip_id = htons(ip_id++); 165 opts = NULL; 166 /* XXX prevent ip_output from overwriting header fields */ 167 flags |= IP_RAWOUTPUT; 168 ipstat.ips_rawout++; 169 } 170 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 171} 172 173/* 174 * Raw IP socket option processing. 175 */ 176int 177rip_ctloutput(op, so, level, optname, m) 178 int op; 179 struct socket *so; 180 int level, optname; 181 struct mbuf **m; 182{ 183 register struct inpcb *inp = sotoinpcb(so); 184 register int error; 185 186 if (level != IPPROTO_IP) { 187 if (op == PRCO_SETOPT && *m) 188 (void)m_free(*m); 189 return (EINVAL); 190 } 191 192 switch (optname) { 193 194 case IP_HDRINCL: 195 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 196 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 197 return (EINVAL); 198 if (op == PRCO_SETOPT) { 199 if (*mtod(*m, int *)) 200 inp->inp_flags |= INP_HDRINCL; 201 else 202 inp->inp_flags &= ~INP_HDRINCL; 203 (void)m_free(*m); 204 } else { 205 (*m)->m_len = sizeof (int); 206 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 207 } 208 return (0); 209 } 210 break; 211 212 case IP_FW_ADD: 213 case IP_FW_DEL: 214 case IP_FW_FLUSH: 215 case IP_FW_POLICY: 216 if (ip_fw_ctl_ptr==NULL) { 217 if (*m) 218 (void)m_free(*m); 219 return(EINVAL); 220 } 221 222 if (op == PRCO_SETOPT) { 223 error=(*ip_fw_ctl_ptr)(optname, *m); 224 if (*m) 225 (void)m_free(*m); 226 } 227 else 228 error=EINVAL; 229 return(error); 230 231 case IP_ACCT_DEL: 232 case IP_ACCT_ADD: 233 case IP_ACCT_CLR: 234 case IP_ACCT_FLUSH: 235 case IP_ACCT_ZERO: 236 if (ip_acct_ctl_ptr==NULL) { 237 if (*m) 238 (void)m_free(*m); 239 return(EINVAL); 240 } 241 242 if (op = PRCO_SETOPT) { 243 error=(*ip_acct_ctl_ptr)(optname, *m); 244 if (*m) 245 (void)m_free(*m); 246 } 247 else 248 error=EINVAL; 249 return(error); 250 251 case IP_RSVP_ON: 252 return ip_rsvp_init(so); 253 break; 254 255 case IP_RSVP_OFF: 256 return ip_rsvp_done(); 257 break; 258 259 case DVMRP_INIT: 260 case DVMRP_DONE: 261 case DVMRP_ADD_VIF: 262 case DVMRP_DEL_VIF: 263 case DVMRP_ADD_MFC: 264 case DVMRP_DEL_MFC: 265 if (op == PRCO_SETOPT) { 266 error = ip_mrouter_cmd(optname, so, *m); 267 if (*m) 268 (void)m_free(*m); 269 } else 270 error = EINVAL; 271 return (error); 272 } 273 return (ip_ctloutput(op, so, level, optname, m)); 274} 275 276u_long rip_sendspace = RIPSNDQ; 277u_long rip_recvspace = RIPRCVQ; 278 279/*ARGSUSED*/ 280int 281rip_usrreq(so, req, m, nam, control) 282 register struct socket *so; 283 int req; 284 struct mbuf *m, *nam, *control; 285{ 286 register int error = 0; 287 register struct inpcb *inp = sotoinpcb(so); 288 switch (req) { 289 290 case PRU_ATTACH: 291 if (inp) 292 panic("rip_attach"); 293 if ((so->so_state & SS_PRIV) == 0) { 294 error = EACCES; 295 break; 296 } 297 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 298 (error = in_pcballoc(so, &rawinpcb))) 299 break; 300 inp = (struct inpcb *)so->so_pcb; 301 inp->inp_ip.ip_p = (int)nam; 302 break; 303 304 case PRU_DISCONNECT: 305 if ((so->so_state & SS_ISCONNECTED) == 0) { 306 error = ENOTCONN; 307 break; 308 } 309 /* FALLTHROUGH */ 310 case PRU_ABORT: 311 soisdisconnected(so); 312 /* FALLTHROUGH */ 313 case PRU_DETACH: 314 if (inp == 0) 315 panic("rip_detach"); 316 if (so == ip_mrouter) 317 ip_mrouter_done(); 318 if (so == ip_rsvpd) 319 ip_rsvp_done(); 320 in_pcbdetach(inp); 321 break; 322 323 case PRU_BIND: 324 { 325 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 326 327 if (nam->m_len != sizeof(*addr)) { 328 error = EINVAL; 329 break; 330 } 331 if ((ifnet == 0) || 332 ((addr->sin_family != AF_INET) && 333 (addr->sin_family != AF_IMPLINK)) || 334 (addr->sin_addr.s_addr && 335 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 336 error = EADDRNOTAVAIL; 337 break; 338 } 339 inp->inp_laddr = addr->sin_addr; 340 break; 341 } 342 case PRU_CONNECT: 343 { 344 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 345 346 if (nam->m_len != sizeof(*addr)) { 347 error = EINVAL; 348 break; 349 } 350 if (ifnet == 0) { 351 error = EADDRNOTAVAIL; 352 break; 353 } 354 if ((addr->sin_family != AF_INET) && 355 (addr->sin_family != AF_IMPLINK)) { 356 error = EAFNOSUPPORT; 357 break; 358 } 359 inp->inp_faddr = addr->sin_addr; 360 soisconnected(so); 361 break; 362 } 363 364 case PRU_CONNECT2: 365 error = EOPNOTSUPP; 366 break; 367 368 /* 369 * Mark the connection as being incapable of further input. 370 */ 371 case PRU_SHUTDOWN: 372 socantsendmore(so); 373 break; 374 375 /* 376 * Ship a packet out. The appropriate raw output 377 * routine handles any massaging necessary. 378 */ 379 case PRU_SEND: 380 { 381 register u_long dst; 382 383 if (so->so_state & SS_ISCONNECTED) { 384 if (nam) { 385 error = EISCONN; 386 break; 387 } 388 dst = inp->inp_faddr.s_addr; 389 } else { 390 if (nam == NULL) { 391 error = ENOTCONN; 392 break; 393 } 394 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 395 } 396 error = rip_output(m, so, dst); 397 m = NULL; 398 break; 399 } 400 401 case PRU_SENSE: 402 /* 403 * stat: don't bother with a blocksize. 404 */ 405 return (0); 406 407 /* 408 * Not supported. 409 */ 410 case PRU_RCVOOB: 411 case PRU_RCVD: 412 case PRU_LISTEN: 413 case PRU_ACCEPT: 414 case PRU_SENDOOB: 415 error = EOPNOTSUPP; 416 break; 417 418 case PRU_SOCKADDR: 419 in_setsockaddr(inp, nam); 420 break; 421 422 case PRU_PEERADDR: 423 in_setpeeraddr(inp, nam); 424 break; 425 426 default: 427 panic("rip_usrreq"); 428 } 429 if (m != NULL) 430 m_freem(m); 431 return (error); 432} 433