raw_ip.c revision 3311
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 1.4 1994/09/14 03:10:15 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 56struct inpcb rawinpcb; 57 58/* 59 * Nominal space allocated to a raw ip socket. 60 */ 61#define RIPSNDQ 8192 62#define RIPRCVQ 8192 63 64/* 65 * Raw interface to IP protocol. 66 */ 67 68/* 69 * Initialize raw connection block q. 70 */ 71void 72rip_init() 73{ 74 75 rawinpcb.inp_next = rawinpcb.inp_prev = &rawinpcb; 76} 77 78struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 79/* 80 * Setup generic address and protocol structures 81 * for raw_input routine, then pass them along with 82 * mbuf chain. 83 */ 84void 85rip_input(m) 86 struct mbuf *m; 87{ 88 register struct ip *ip = mtod(m, struct ip *); 89 register struct inpcb *inp; 90 struct socket *last = 0; 91 92 ripsrc.sin_addr = ip->ip_src; 93 for (inp = rawinpcb.inp_next; inp != &rawinpcb; inp = inp->inp_next) { 94 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 95 continue; 96 if (inp->inp_laddr.s_addr && 97 inp->inp_laddr.s_addr == ip->ip_dst.s_addr) 98 continue; 99 if (inp->inp_faddr.s_addr && 100 inp->inp_faddr.s_addr == ip->ip_src.s_addr) 101 continue; 102 if (last) { 103 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 104 if (n) { 105 if (sbappendaddr(&last->so_rcv, 106 (struct sockaddr *)&ripsrc, n, 107 (struct mbuf *)0) == 0) 108 /* should notify about lost packet */ 109 m_freem(n); 110 else 111 sorwakeup(last); 112 } 113 } 114 last = inp->inp_socket; 115 } 116 if (last) { 117 if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&ripsrc, 118 m, (struct mbuf *)0) == 0) 119 m_freem(m); 120 else 121 sorwakeup(last); 122 } else { 123 m_freem(m); 124 ipstat.ips_noproto++; 125 ipstat.ips_delivered--; 126 } 127} 128 129/* 130 * Generate IP header and pass packet to ip_output. 131 * Tack on options user may have setup with control call. 132 */ 133int 134rip_output(m, so, dst) 135 register struct mbuf *m; 136 struct socket *so; 137 u_long dst; 138{ 139 register struct ip *ip; 140 register struct inpcb *inp = sotoinpcb(so); 141 struct mbuf *opts; 142 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 143 144 /* 145 * If the user handed us a complete IP packet, use it. 146 * Otherwise, allocate an mbuf for a header and fill it in. 147 */ 148 if ((inp->inp_flags & INP_HDRINCL) == 0) { 149 M_PREPEND(m, sizeof(struct ip), M_WAIT); 150 ip = mtod(m, struct ip *); 151 ip->ip_tos = 0; 152 ip->ip_off = 0; 153 ip->ip_p = inp->inp_ip.ip_p; 154 ip->ip_len = m->m_pkthdr.len; 155 ip->ip_src = inp->inp_laddr; 156 ip->ip_dst.s_addr = dst; 157 ip->ip_ttl = MAXTTL; 158 opts = inp->inp_options; 159 } else { 160 ip = mtod(m, struct ip *); 161 if (ip->ip_id == 0) 162 ip->ip_id = htons(ip_id++); 163 opts = NULL; 164 /* XXX prevent ip_output from overwriting header fields */ 165 flags |= IP_RAWOUTPUT; 166 ipstat.ips_rawout++; 167 } 168 return (ip_output(m, opts, &inp->inp_route, flags, inp->inp_moptions)); 169} 170 171/* 172 * Raw IP socket option processing. 173 */ 174int 175rip_ctloutput(op, so, level, optname, m) 176 int op; 177 struct socket *so; 178 int level, optname; 179 struct mbuf **m; 180{ 181 register struct inpcb *inp = sotoinpcb(so); 182 register int error; 183 184 if (level != IPPROTO_IP) 185 return (EINVAL); 186 187 switch (optname) { 188 189 case IP_HDRINCL: 190 if (op == PRCO_SETOPT || op == PRCO_GETOPT) { 191 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 192 return (EINVAL); 193 if (op == PRCO_SETOPT) { 194 if (*mtod(*m, int *)) 195 inp->inp_flags |= INP_HDRINCL; 196 else 197 inp->inp_flags &= ~INP_HDRINCL; 198 (void)m_free(*m); 199 } else { 200 (*m)->m_len = sizeof (int); 201 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 202 } 203 return (0); 204 } 205 break; 206 207 case IP_RSVP_ON: 208 error = ip_rsvp_init(so); 209 break; 210 211 case IP_RSVP_OFF: 212 error = ip_rsvp_done(); 213 break; 214 215 case DVMRP_INIT: 216 case DVMRP_DONE: 217 case DVMRP_ADD_VIF: 218 case DVMRP_DEL_VIF: 219 case DVMRP_ADD_MFC: 220 case DVMRP_DEL_MFC: 221 if (op == PRCO_SETOPT) { 222 error = ip_mrouter_cmd(optname, so, *m); 223 if (*m) 224 (void)m_free(*m); 225 } else 226 error = EINVAL; 227 return (error); 228 } 229 return (ip_ctloutput(op, so, level, optname, m)); 230} 231 232u_long rip_sendspace = RIPSNDQ; 233u_long rip_recvspace = RIPRCVQ; 234 235/*ARGSUSED*/ 236int 237rip_usrreq(so, req, m, nam, control) 238 register struct socket *so; 239 int req; 240 struct mbuf *m, *nam, *control; 241{ 242 register int error = 0; 243 register struct inpcb *inp = sotoinpcb(so); 244 switch (req) { 245 246 case PRU_ATTACH: 247 if (inp) 248 panic("rip_attach"); 249 if ((so->so_state & SS_PRIV) == 0) { 250 error = EACCES; 251 break; 252 } 253 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 254 (error = in_pcballoc(so, &rawinpcb))) 255 break; 256 inp = (struct inpcb *)so->so_pcb; 257 inp->inp_ip.ip_p = (int)nam; 258 break; 259 260 case PRU_DISCONNECT: 261 if ((so->so_state & SS_ISCONNECTED) == 0) { 262 error = ENOTCONN; 263 break; 264 } 265 /* FALLTHROUGH */ 266 case PRU_ABORT: 267 soisdisconnected(so); 268 /* FALLTHROUGH */ 269 case PRU_DETACH: 270 if (inp == 0) 271 panic("rip_detach"); 272 if (so == ip_mrouter) 273 ip_mrouter_done(); 274 in_pcbdetach(inp); 275 break; 276 277 case PRU_BIND: 278 { 279 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 280 281 if (nam->m_len != sizeof(*addr)) { 282 error = EINVAL; 283 break; 284 } 285 if ((ifnet == 0) || 286 ((addr->sin_family != AF_INET) && 287 (addr->sin_family != AF_IMPLINK)) || 288 (addr->sin_addr.s_addr && 289 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 290 error = EADDRNOTAVAIL; 291 break; 292 } 293 inp->inp_laddr = addr->sin_addr; 294 break; 295 } 296 case PRU_CONNECT: 297 { 298 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 299 300 if (nam->m_len != sizeof(*addr)) { 301 error = EINVAL; 302 break; 303 } 304 if (ifnet == 0) { 305 error = EADDRNOTAVAIL; 306 break; 307 } 308 if ((addr->sin_family != AF_INET) && 309 (addr->sin_family != AF_IMPLINK)) { 310 error = EAFNOSUPPORT; 311 break; 312 } 313 inp->inp_faddr = addr->sin_addr; 314 soisconnected(so); 315 break; 316 } 317 318 case PRU_CONNECT2: 319 error = EOPNOTSUPP; 320 break; 321 322 /* 323 * Mark the connection as being incapable of further input. 324 */ 325 case PRU_SHUTDOWN: 326 socantsendmore(so); 327 break; 328 329 /* 330 * Ship a packet out. The appropriate raw output 331 * routine handles any massaging necessary. 332 */ 333 case PRU_SEND: 334 { 335 register u_long dst; 336 337 if (so->so_state & SS_ISCONNECTED) { 338 if (nam) { 339 error = EISCONN; 340 break; 341 } 342 dst = inp->inp_faddr.s_addr; 343 } else { 344 if (nam == NULL) { 345 error = ENOTCONN; 346 break; 347 } 348 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 349 } 350 error = rip_output(m, so, dst); 351 m = NULL; 352 break; 353 } 354 355 case PRU_SENSE: 356 /* 357 * stat: don't bother with a blocksize. 358 */ 359 return (0); 360 361 /* 362 * Not supported. 363 */ 364 case PRU_RCVOOB: 365 case PRU_RCVD: 366 case PRU_LISTEN: 367 case PRU_ACCEPT: 368 case PRU_SENDOOB: 369 error = EOPNOTSUPP; 370 break; 371 372 case PRU_SOCKADDR: 373 in_setsockaddr(inp, nam); 374 break; 375 376 case PRU_PEERADDR: 377 in_setpeeraddr(inp, nam); 378 break; 379 380 default: 381 panic("rip_usrreq"); 382 } 383 if (m != NULL) 384 m_freem(m); 385 return (error); 386} 387