raw_ip.c revision 5089
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 1.9 1994/12/12 17:20:55 ugen 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_CLR: 235 case IP_ACCT_FLUSH: 236 case IP_ACCT_ZERO: 237 238 if (op = PRCO_SETOPT) { 239 error=ip_acct_ctl(optname, *m); 240 if (*m) 241 (void)m_free(*m); 242 } 243 else 244 error=EINVAL; 245 return(error); 246#endif 247 248 case IP_RSVP_ON: 249 error = ip_rsvp_init(so); 250 break; 251 252 case IP_RSVP_OFF: 253 error = ip_rsvp_done(); 254 break; 255 256 case DVMRP_INIT: 257 case DVMRP_DONE: 258 case DVMRP_ADD_VIF: 259 case DVMRP_DEL_VIF: 260 case DVMRP_ADD_MFC: 261 case DVMRP_DEL_MFC: 262 if (op == PRCO_SETOPT) { 263 error = ip_mrouter_cmd(optname, so, *m); 264 if (*m) 265 (void)m_free(*m); 266 } else 267 error = EINVAL; 268 return (error); 269 } 270 return (ip_ctloutput(op, so, level, optname, m)); 271} 272 273u_long rip_sendspace = RIPSNDQ; 274u_long rip_recvspace = RIPRCVQ; 275 276/*ARGSUSED*/ 277int 278rip_usrreq(so, req, m, nam, control) 279 register struct socket *so; 280 int req; 281 struct mbuf *m, *nam, *control; 282{ 283 register int error = 0; 284 register struct inpcb *inp = sotoinpcb(so); 285 switch (req) { 286 287 case PRU_ATTACH: 288 if (inp) 289 panic("rip_attach"); 290 if ((so->so_state & SS_PRIV) == 0) { 291 error = EACCES; 292 break; 293 } 294 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 295 (error = in_pcballoc(so, &rawinpcb))) 296 break; 297 inp = (struct inpcb *)so->so_pcb; 298 inp->inp_ip.ip_p = (int)nam; 299 break; 300 301 case PRU_DISCONNECT: 302 if ((so->so_state & SS_ISCONNECTED) == 0) { 303 error = ENOTCONN; 304 break; 305 } 306 /* FALLTHROUGH */ 307 case PRU_ABORT: 308 soisdisconnected(so); 309 /* FALLTHROUGH */ 310 case PRU_DETACH: 311 if (inp == 0) 312 panic("rip_detach"); 313 if (so == ip_mrouter) 314 ip_mrouter_done(); 315 in_pcbdetach(inp); 316 break; 317 318 case PRU_BIND: 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 ((addr->sin_family != AF_INET) && 328 (addr->sin_family != AF_IMPLINK)) || 329 (addr->sin_addr.s_addr && 330 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 331 error = EADDRNOTAVAIL; 332 break; 333 } 334 inp->inp_laddr = addr->sin_addr; 335 break; 336 } 337 case PRU_CONNECT: 338 { 339 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 340 341 if (nam->m_len != sizeof(*addr)) { 342 error = EINVAL; 343 break; 344 } 345 if (ifnet == 0) { 346 error = EADDRNOTAVAIL; 347 break; 348 } 349 if ((addr->sin_family != AF_INET) && 350 (addr->sin_family != AF_IMPLINK)) { 351 error = EAFNOSUPPORT; 352 break; 353 } 354 inp->inp_faddr = addr->sin_addr; 355 soisconnected(so); 356 break; 357 } 358 359 case PRU_CONNECT2: 360 error = EOPNOTSUPP; 361 break; 362 363 /* 364 * Mark the connection as being incapable of further input. 365 */ 366 case PRU_SHUTDOWN: 367 socantsendmore(so); 368 break; 369 370 /* 371 * Ship a packet out. The appropriate raw output 372 * routine handles any massaging necessary. 373 */ 374 case PRU_SEND: 375 { 376 register u_long dst; 377 378 if (so->so_state & SS_ISCONNECTED) { 379 if (nam) { 380 error = EISCONN; 381 break; 382 } 383 dst = inp->inp_faddr.s_addr; 384 } else { 385 if (nam == NULL) { 386 error = ENOTCONN; 387 break; 388 } 389 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 390 } 391 error = rip_output(m, so, dst); 392 m = NULL; 393 break; 394 } 395 396 case PRU_SENSE: 397 /* 398 * stat: don't bother with a blocksize. 399 */ 400 return (0); 401 402 /* 403 * Not supported. 404 */ 405 case PRU_RCVOOB: 406 case PRU_RCVD: 407 case PRU_LISTEN: 408 case PRU_ACCEPT: 409 case PRU_SENDOOB: 410 error = EOPNOTSUPP; 411 break; 412 413 case PRU_SOCKADDR: 414 in_setsockaddr(inp, nam); 415 break; 416 417 case PRU_PEERADDR: 418 in_setpeeraddr(inp, nam); 419 break; 420 421 default: 422 panic("rip_usrreq"); 423 } 424 if (m != NULL) 425 m_freem(m); 426 return (error); 427} 428