raw_ip.c revision 14824
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 8.7 (Berkeley) 5/15/95 34 * $Id: raw_ip.c,v 1.29 1996/03/13 08:02:45 pst Exp $ 35 */ 36 37#include <sys/param.h> 38#include <sys/queue.h> 39#include <sys/malloc.h> 40#include <sys/mbuf.h> 41#include <sys/socket.h> 42#include <sys/protosw.h> 43#include <sys/socketvar.h> 44#include <sys/errno.h> 45#include <sys/systm.h> 46 47#include <net/if.h> 48#include <net/route.h> 49 50#include <netinet/in.h> 51#include <netinet/in_systm.h> 52#include <netinet/ip.h> 53#include <netinet/in_pcb.h> 54#include <netinet/in_var.h> 55#include <netinet/ip_var.h> 56#include <netinet/ip_mroute.h> 57 58#include <netinet/ip_fw.h> 59 60static struct inpcbhead ripcb; 61static struct inpcbinfo ripcbinfo; 62 63/* 64 * Nominal space allocated to a raw ip socket. 65 */ 66#define RIPSNDQ 8192 67#define RIPRCVQ 8192 68 69/* 70 * Raw interface to IP protocol. 71 */ 72 73/* 74 * Initialize raw connection block q. 75 */ 76void 77rip_init() 78{ 79 LIST_INIT(&ripcb); 80 ripcbinfo.listhead = &ripcb; 81 /* 82 * XXX We don't use the hash list for raw IP, but it's easier 83 * to allocate a one entry hash list than it is to check all 84 * over the place for hashbase == NULL. 85 */ 86 ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize); 87} 88 89static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 90/* 91 * Setup generic address and protocol structures 92 * for raw_input routine, then pass them along with 93 * mbuf chain. 94 */ 95void 96rip_input(m, iphlen) 97 struct mbuf *m; 98 int iphlen; 99{ 100 register struct ip *ip = mtod(m, struct ip *); 101 register struct inpcb *inp; 102 struct socket *last = 0; 103 104 ripsrc.sin_addr = ip->ip_src; 105 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 106 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 107 continue; 108 if (inp->inp_laddr.s_addr && 109 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 110 continue; 111 if (inp->inp_faddr.s_addr && 112 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 113 continue; 114 if (last) { 115 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 116 if (n) { 117 if (sbappendaddr(&last->so_rcv, 118 (struct sockaddr *)&ripsrc, n, 119 (struct mbuf *)0) == 0) 120 /* should notify about lost packet */ 121 m_freem(n); 122 else 123 sorwakeup(last); 124 } 125 } 126 last = inp->inp_socket; 127 } 128 if (last) { 129 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 130 m, (struct mbuf *)0) == 0) 131 m_freem(m); 132 else 133 sorwakeup(last); 134 } else { 135 m_freem(m); 136 ipstat.ips_noproto++; 137 ipstat.ips_delivered--; 138 } 139} 140 141/* 142 * Generate IP header and pass packet to ip_output. 143 * Tack on options user may have setup with control call. 144 */ 145int 146rip_output(m, so, dst) 147 register struct mbuf *m; 148 struct socket *so; 149 u_long dst; 150{ 151 register struct ip *ip; 152 register struct inpcb *inp = sotoinpcb(so); 153 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 154 155 /* 156 * If the user handed us a complete IP packet, use it. 157 * Otherwise, allocate an mbuf for a header and fill it in. 158 */ 159 if ((inp->inp_flags & INP_HDRINCL) == 0) { 160 M_PREPEND(m, sizeof(struct ip), M_WAIT); 161 ip = mtod(m, struct ip *); 162 ip->ip_tos = 0; 163 ip->ip_off = 0; 164 ip->ip_p = inp->inp_ip.ip_p; 165 ip->ip_len = m->m_pkthdr.len; 166 ip->ip_src = inp->inp_laddr; 167 ip->ip_dst.s_addr = dst; 168 ip->ip_ttl = MAXTTL; 169 } else { 170 ip = mtod(m, struct ip *); 171 /* don't allow both user specified and setsockopt options, 172 and don't allow packet length sizes that will crash */ 173 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) || 174 (ip->ip_len > m->m_pkthdr.len)) { 175 m_freem(m); 176 return EINVAL; 177 } 178 if (ip->ip_id == 0) 179 ip->ip_id = htons(ip_id++); 180 /* XXX prevent ip_output from overwriting header fields */ 181 flags |= IP_RAWOUTPUT; 182 ipstat.ips_rawout++; 183 } 184 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 185 inp->inp_moptions)); 186} 187 188/* 189 * Raw IP socket option processing. 190 */ 191int 192rip_ctloutput(op, so, level, optname, m) 193 int op; 194 struct socket *so; 195 int level, optname; 196 struct mbuf **m; 197{ 198 register struct inpcb *inp = sotoinpcb(so); 199 register int error; 200 201 if (level != IPPROTO_IP) { 202 if (op == PRCO_SETOPT && *m) 203 (void)m_free(*m); 204 return (EINVAL); 205 } 206 207 switch (optname) { 208 209 case IP_HDRINCL: 210 error = 0; 211 if (op == PRCO_SETOPT) { 212 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 213 error = EINVAL; 214 else if (*mtod(*m, int *)) 215 inp->inp_flags |= INP_HDRINCL; 216 else 217 inp->inp_flags &= ~INP_HDRINCL; 218 if (*m) 219 (void)m_free(*m); 220 } else { 221 *m = m_get(M_WAIT, MT_SOOPTS); 222 (*m)->m_len = sizeof (int); 223 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 224 } 225 return (error); 226 227 case IP_FW_GET: 228 if (ip_fw_ctl_ptr==NULL || op == PRCO_SETOPT) { 229 if (*m) (void)m_free(*m); 230 return(EINVAL); 231 } 232 return (*ip_fw_ctl_ptr)(optname, m); 233 case IP_FW_ADD: 234 case IP_FW_DEL: 235 case IP_FW_FLUSH: 236 case IP_FW_ZERO: 237 if (ip_fw_ctl_ptr==NULL || op != PRCO_SETOPT) { 238 if (*m) (void)m_free(*m); 239 return(EINVAL); 240 } 241 242 return (*ip_fw_ctl_ptr)(optname, m); 243 return(error); 244 245 case IP_RSVP_ON: 246 return ip_rsvp_init(so); 247 break; 248 249 case IP_RSVP_OFF: 250 return ip_rsvp_done(); 251 break; 252 253 case IP_RSVP_VIF_ON: 254 return ip_rsvp_vif_init(so, *m); 255 256 case IP_RSVP_VIF_OFF: 257 return ip_rsvp_vif_done(so, *m); 258 259 case MRT_INIT: 260 case MRT_DONE: 261 case MRT_ADD_VIF: 262 case MRT_DEL_VIF: 263 case MRT_ADD_MFC: 264 case MRT_DEL_MFC: 265 case MRT_VERSION: 266 case MRT_ASSERT: 267 if (op == PRCO_SETOPT) { 268 error = ip_mrouter_set(optname, so, *m); 269 if (*m) 270 (void)m_free(*m); 271 } else if (op == PRCO_GETOPT) { 272 error = ip_mrouter_get(optname, so, m); 273 } else 274 error = EINVAL; 275 return (error); 276 } 277 return (ip_ctloutput(op, so, level, optname, m)); 278} 279 280static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ 281static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ 282 283/*ARGSUSED*/ 284int 285rip_usrreq(so, req, m, nam, control) 286 register struct socket *so; 287 int req; 288 struct mbuf *m, *nam, *control; 289{ 290 register int error = 0; 291 register struct inpcb *inp = sotoinpcb(so); 292 293 if (req == PRU_CONTROL) 294 return (in_control(so, (u_long)m, (caddr_t)nam, 295 (struct ifnet *)control)); 296 297 switch (req) { 298 299 case PRU_ATTACH: 300 if (inp) 301 panic("rip_attach"); 302 if ((so->so_state & SS_PRIV) == 0) { 303 error = EACCES; 304 break; 305 } 306 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 307 (error = in_pcballoc(so, &ripcbinfo))) 308 break; 309 inp = (struct inpcb *)so->so_pcb; 310 inp->inp_ip.ip_p = (int)nam; 311 break; 312 313 case PRU_DISCONNECT: 314 if ((so->so_state & SS_ISCONNECTED) == 0) { 315 error = ENOTCONN; 316 break; 317 } 318 /* FALLTHROUGH */ 319 case PRU_ABORT: 320 soisdisconnected(so); 321 /* FALLTHROUGH */ 322 case PRU_DETACH: 323 if (inp == 0) 324 panic("rip_detach"); 325 if (so == ip_mrouter) 326 ip_mrouter_done(); 327 ip_rsvp_force_done(so); 328 if (so == ip_rsvpd) 329 ip_rsvp_done(); 330 in_pcbdetach(inp); 331 break; 332 333 case PRU_BIND: 334 { 335 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 336 337 if (nam->m_len != sizeof(*addr)) { 338 error = EINVAL; 339 break; 340 } 341 if ((ifnet == 0) || 342 ((addr->sin_family != AF_INET) && 343 (addr->sin_family != AF_IMPLINK)) || 344 (addr->sin_addr.s_addr && 345 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 346 error = EADDRNOTAVAIL; 347 break; 348 } 349 inp->inp_laddr = addr->sin_addr; 350 break; 351 } 352 case PRU_CONNECT: 353 { 354 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 355 356 if (nam->m_len != sizeof(*addr)) { 357 error = EINVAL; 358 break; 359 } 360 if (ifnet == 0) { 361 error = EADDRNOTAVAIL; 362 break; 363 } 364 if ((addr->sin_family != AF_INET) && 365 (addr->sin_family != AF_IMPLINK)) { 366 error = EAFNOSUPPORT; 367 break; 368 } 369 inp->inp_faddr = addr->sin_addr; 370 soisconnected(so); 371 break; 372 } 373 374 case PRU_CONNECT2: 375 error = EOPNOTSUPP; 376 break; 377 378 /* 379 * Mark the connection as being incapable of further input. 380 */ 381 case PRU_SHUTDOWN: 382 socantsendmore(so); 383 break; 384 385 /* 386 * Ship a packet out. The appropriate raw output 387 * routine handles any massaging necessary. 388 */ 389 case PRU_SEND: 390 { 391 register u_long dst; 392 393 if (so->so_state & SS_ISCONNECTED) { 394 if (nam) { 395 error = EISCONN; 396 break; 397 } 398 dst = inp->inp_faddr.s_addr; 399 } else { 400 if (nam == NULL) { 401 error = ENOTCONN; 402 break; 403 } 404 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 405 } 406 error = rip_output(m, so, dst); 407 m = NULL; 408 break; 409 } 410 411 case PRU_SENSE: 412 /* 413 * stat: don't bother with a blocksize. 414 */ 415 return (0); 416 417 /* 418 * Not supported. 419 */ 420 case PRU_RCVOOB: 421 case PRU_RCVD: 422 case PRU_LISTEN: 423 case PRU_ACCEPT: 424 case PRU_SENDOOB: 425 error = EOPNOTSUPP; 426 break; 427 428 case PRU_SOCKADDR: 429 in_setsockaddr(inp, nam); 430 break; 431 432 case PRU_PEERADDR: 433 in_setpeeraddr(inp, nam); 434 break; 435 436 default: 437 panic("rip_usrreq"); 438 } 439 if (m != NULL) 440 m_freem(m); 441 return (error); 442} 443