raw_ip.c revision 5085
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 1.8 1994/11/16 10:17:11 jkh 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#ifdef IPACCT 60#include <netinet/ip_fw.h> 61#endif 62 63struct inpcb rawinpcb; 64 65/* 66 * Nominal space allocated to a raw ip socket. 67 */ 68#define RIPSNDQ 8192 69#define RIPRCVQ 8192 70 71/* 72 * Raw interface to IP protocol. 73 */ 74 75/* 76 * Initialize raw connection block q. 77 */ 78void 79rip_init() 80{ 81 82 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 83} 84 85struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 86/* 87 * Setup generic address and protocol structures 88 * for raw_input routine, then pass them along with 89 * mbuf chain. 90 */ 91void 92rip_input(m) 93 struct mbuf *m; 94{ 95 register struct ip *ip = mtod(m, struct ip *); 96 register struct inpcb *inp; 97 struct socket *last = 0; 98 99 ripsrc.sin_addr = ip->ip_src; 100 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 101 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 102 continue; 103 if (inp->inp_laddr.s_addr && 104 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 105 continue; 106 if (inp->inp_faddr.s_addr && 107 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 108 continue; 109 if (last) { 110 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 111 if (n) { 112 if (sbappendaddr(&last->so_rcv, 113 (struct sockaddr *)&ripsrc, n, 114 (struct mbuf *)0) == 0) 115 /* should notify about lost packet */ 116 m_freem(n); 117 else 118 sorwakeup(last); 119 } 120 } 121 last = inp->inp_socket; 122 } 123 if (last) { 124 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 125 m, (struct mbuf *)0) == 0) 126 m_freem(m); 127 else 128 sorwakeup(last); 129 } else { 130 m_freem(m); 131 ipstat.ips_noproto++; 132 ipstat.ips_delivered--; 133 } 134} 135 136/* 137 * Generate IP header and pass packet to ip_output. 138 * Tack on options user may have setup with control call. 139 */ 140int 141rip_output(m, so, dst) 142 register struct mbuf *m; 143 struct socket *so; 144 u_long dst; 145{ 146 register struct ip *ip; 147 register struct inpcb *inp = sotoinpcb(so); 148 struct mbuf *opts; 149 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 150 151 /* 152 * If the user handed us a complete IP packet, use it. 153 * Otherwise, allocate an mbuf for a header and fill it in. 154 */ 155 if ((inp->inp_flags & INP_HDRINCL) == 0) { 156 M_PREPEND(m, sizeof(struct ip), M_WAIT); 157 ip = mtod(m, struct ip *); 158 ip->ip_tos = 0; 159 ip->ip_off = 0; 160 ip->ip_p = inp->inp_ip.ip_p; 161 ip->ip_len = m->m_pkthdr.len; 162 ip->ip_src = inp->inp_laddr; 163 ip->ip_dst.s_addr = dst; 164 ip->ip_ttl = MAXTTL; 165 opts = inp->inp_options; 166 } else { 167 ip = mtod(m, struct ip *); 168 if (ip->ip_id == 0) 169 ip->ip_id = htons(ip_id++); 170 opts = NULL; 171 /* XXX prevent ip_output from overwriting header fields */ 172 flags |= IP_RAWOUTPUT; 173 ipstat.ips_rawout++; 174 } 175 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 176} 177 178/* 179 * Raw IP socket option processing. 180 */ 181int 182rip_ctloutput(op, so, level, optname, m) 183 int op; 184 struct socket *so; 185 int level, optname; 186 struct mbuf **m; 187{ 188 register struct inpcb *inp = sotoinpcb(so); 189 register int error; 190 191 if (level != IPPROTO_IP) 192 return (EINVAL); 193 194 switch (optname) { 195 196 case IP_HDRINCL: 197 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 198 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 199 return (EINVAL); 200 if (op == PRCO_SETOPT) { 201 if (*mtod(*m, int *)) 202 inp->inp_flags |= INP_HDRINCL; 203 else 204 inp->inp_flags &= ~INP_HDRINCL; 205 (void)m_free(*m); 206 } else { 207 (*m)->m_len = sizeof (int); 208 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 209 } 210 return (0); 211 } 212 break; 213 214#ifdef IPFIREWALL 215 case IP_FW_ADD_BLK: 216 case IP_FW_ADD_FWD: 217 case IP_FW_DEL_BLK: 218 case IP_FW_DEL_FWD: 219 case IP_FW_FLUSH: 220 case IP_FW_POLICY: 221 222 if (op == PRCO_SETOPT) { 223 error=ip_fw_ctl(optname, *m); 224 if (*m) 225 (void)m_free(*m); 226 } 227 else 228 error=EINVAL; 229 return(error); 230#endif 231#ifdef IPACCT 232 case IP_ACCT_DEL: 233 case IP_ACCT_ADD: 234 case IP_ACCT_FLUSH: 235 case IP_ACCT_ZERO: 236 237 if (op = PRCO_SETOPT) { 238 error=ip_acct_ctl(optname, *m); 239 if (*m) 240 (void)m_free(*m); 241 } 242 else 243 error=EINVAL; 244 return(error); 245#endif 246 247 case IP_RSVP_ON: 248 error = ip_rsvp_init(so); 249 break; 250 251 case IP_RSVP_OFF: 252 error = ip_rsvp_done(); 253 break; 254 255 case DVMRP_INIT: 256 case DVMRP_DONE: 257 case DVMRP_ADD_VIF: 258 case DVMRP_DEL_VIF: 259 case DVMRP_ADD_MFC: 260 case DVMRP_DEL_MFC: 261 if (op == PRCO_SETOPT) { 262 error = ip_mrouter_cmd(optname, so, *m); 263 if (*m) 264 (void)m_free(*m); 265 } else 266 error = EINVAL; 267 return (error); 268 } 269 return (ip_ctloutput(op, so, level, optname, m)); 270} 271 272u_long rip_sendspace = RIPSNDQ; 273u_long rip_recvspace = RIPRCVQ; 274 275/*ARGSUSED*/ 276int 277rip_usrreq(so, req, m, nam, control) 278 register struct socket *so; 279 int req; 280 struct mbuf *m, *nam, *control; 281{ 282 register int error = 0; 283 register struct inpcb *inp = sotoinpcb(so); 284 switch (req) { 285 286 case PRU_ATTACH: 287 if (inp) 288 panic("rip_attach"); 289 if ((so->so_state & SS_PRIV) == 0) { 290 error = EACCES; 291 break; 292 } 293 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 294 (error = in_pcballoc(so, &rawinpcb))) 295 break; 296 inp = (struct inpcb *)so->so_pcb; 297 inp->inp_ip.ip_p = (int)nam; 298 break; 299 300 case PRU_DISCONNECT: 301 if ((so->so_state & SS_ISCONNECTED) == 0) { 302 error = ENOTCONN; 303 break; 304 } 305 /* FALLTHROUGH */ 306 case PRU_ABORT: 307 soisdisconnected(so); 308 /* FALLTHROUGH */ 309 case PRU_DETACH: 310 if (inp == 0) 311 panic("rip_detach"); 312 if (so == ip_mrouter) 313 ip_mrouter_done(); 314 in_pcbdetach(inp); 315 break; 316 317 case PRU_BIND: 318 { 319 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 320 321 if (nam->m_len != sizeof(*addr)) { 322 error = EINVAL; 323 break; 324 } 325 if ((ifnet == 0) || 326 ((addr->sin_family != AF_INET) && 327 (addr->sin_family != AF_IMPLINK)) || 328 (addr->sin_addr.s_addr && 329 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 330 error = EADDRNOTAVAIL; 331 break; 332 } 333 inp->inp_laddr = addr->sin_addr; 334 break; 335 } 336 case PRU_CONNECT: 337 { 338 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 339 340 if (nam->m_len != sizeof(*addr)) { 341 error = EINVAL; 342 break; 343 } 344 if (ifnet == 0) { 345 error = EADDRNOTAVAIL; 346 break; 347 } 348 if ((addr->sin_family != AF_INET) && 349 (addr->sin_family != AF_IMPLINK)) { 350 error = EAFNOSUPPORT; 351 break; 352 } 353 inp->inp_faddr = addr->sin_addr; 354 soisconnected(so); 355 break; 356 } 357 358 case PRU_CONNECT2: 359 error = EOPNOTSUPP; 360 break; 361 362 /* 363 * Mark the connection as being incapable of further input. 364 */ 365 case PRU_SHUTDOWN: 366 socantsendmore(so); 367 break; 368 369 /* 370 * Ship a packet out. The appropriate raw output 371 * routine handles any massaging necessary. 372 */ 373 case PRU_SEND: 374 { 375 register u_long dst; 376 377 if (so->so_state & SS_ISCONNECTED) { 378 if (nam) { 379 error = EISCONN; 380 break; 381 } 382 dst = inp->inp_faddr.s_addr; 383 } else { 384 if (nam == NULL) { 385 error = ENOTCONN; 386 break; 387 } 388 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 389 } 390 error = rip_output(m, so, dst); 391 m = NULL; 392 break; 393 } 394 395 case PRU_SENSE: 396 /* 397 * stat: don't bother with a blocksize. 398 */ 399 return (0); 400 401 /* 402 * Not supported. 403 */ 404 case PRU_RCVOOB: 405 case PRU_RCVD: 406 case PRU_LISTEN: 407 case PRU_ACCEPT: 408 case PRU_SENDOOB: 409 error = EOPNOTSUPP; 410 break; 411 412 case PRU_SOCKADDR: 413 in_setsockaddr(inp, nam); 414 break; 415 416 case PRU_PEERADDR: 417 in_setpeeraddr(inp, nam); 418 break; 419 420 default: 421 panic("rip_usrreq"); 422 } 423 if (m != NULL) 424 m_freem(m); 425 return (error); 426} 427