in_pcb.c revision 1.15
1 /* $NetBSD: in_pcb.c,v 1.15 1995/06/04 05:06:58 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 36 */ 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/protosw.h> 43 #include <sys/socket.h> 44 #include <sys/socketvar.h> 45 #include <sys/ioctl.h> 46 #include <sys/errno.h> 47 #include <sys/time.h> 48 #include <sys/proc.h> 49 50 #include <net/if.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/in_pcb.h> 57 #include <netinet/in_var.h> 58 #include <netinet/ip_var.h> 59 60 struct in_addr zeroin_addr; 61 62 int 63 in_pcballoc(so, head) 64 struct socket *so; 65 struct inpcb *head; 66 { 67 register struct inpcb *inp; 68 69 MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_WAITOK); 70 if (inp == NULL) 71 return (ENOBUFS); 72 bzero((caddr_t)inp, sizeof(*inp)); 73 inp->inp_head = head; 74 inp->inp_socket = so; 75 insque(inp, head); 76 so->so_pcb = (caddr_t)inp; 77 return (0); 78 } 79 80 int 81 in_pcbbind(inp, nam) 82 register struct inpcb *inp; 83 struct mbuf *nam; 84 { 85 register struct socket *so = inp->inp_socket; 86 register struct inpcb *head = inp->inp_head; 87 register struct sockaddr_in *sin; 88 struct proc *p = curproc; /* XXX */ 89 u_int16_t lport = 0; 90 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 91 int error; 92 93 if (in_ifaddr == 0) 94 return (EADDRNOTAVAIL); 95 if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) 96 return (EINVAL); 97 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 98 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 99 (so->so_options & SO_ACCEPTCONN) == 0)) 100 wild = INPLOOKUP_WILDCARD; 101 if (nam) { 102 sin = mtod(nam, struct sockaddr_in *); 103 if (nam->m_len != sizeof (*sin)) 104 return (EINVAL); 105 #ifdef notdef 106 /* 107 * We should check the family, but old programs 108 * incorrectly fail to initialize it. 109 */ 110 if (sin->sin_family != AF_INET) 111 return (EAFNOSUPPORT); 112 #endif 113 lport = sin->sin_port; 114 if (IN_MULTICAST(sin->sin_addr.s_addr)) { 115 /* 116 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 117 * allow complete duplication of binding if 118 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 119 * and a multicast address is bound on both 120 * new and duplicated sockets. 121 */ 122 if (so->so_options & SO_REUSEADDR) 123 reuseport = SO_REUSEADDR|SO_REUSEPORT; 124 } else if (sin->sin_addr.s_addr != INADDR_ANY) { 125 sin->sin_port = 0; /* yech... */ 126 if (ifa_ifwithaddr(sintosa(sin)) == 0) 127 return (EADDRNOTAVAIL); 128 } 129 if (lport) { 130 struct inpcb *t; 131 132 /* GROSS */ 133 if (ntohs(lport) < IPPORT_RESERVED && 134 (error = suser(p->p_ucred, &p->p_acflag))) 135 return (EACCES); 136 t = in_pcblookup(head, zeroin_addr, 0, 137 sin->sin_addr, lport, wild); 138 if (t && (reuseport & t->inp_socket->so_options) == 0) 139 return (EADDRINUSE); 140 } 141 inp->inp_laddr = sin->sin_addr; 142 } 143 if (lport == 0) 144 do { 145 if (head->inp_lport++ < IPPORT_RESERVED || 146 head->inp_lport > IPPORT_USERRESERVED) 147 head->inp_lport = IPPORT_RESERVED; 148 lport = htons(head->inp_lport); 149 } while (in_pcblookup(head, 150 zeroin_addr, 0, inp->inp_laddr, lport, wild)); 151 inp->inp_lport = lport; 152 return (0); 153 } 154 155 /* 156 * Connect from a socket to a specified address. 157 * Both address and port must be specified in argument sin. 158 * If don't have a local address for this socket yet, 159 * then pick one. 160 */ 161 int 162 in_pcbconnect(inp, nam) 163 register struct inpcb *inp; 164 struct mbuf *nam; 165 { 166 struct in_ifaddr *ia; 167 struct sockaddr_in *ifaddr; 168 register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 169 170 if (nam->m_len != sizeof (*sin)) 171 return (EINVAL); 172 if (sin->sin_family != AF_INET) 173 return (EAFNOSUPPORT); 174 if (sin->sin_port == 0) 175 return (EADDRNOTAVAIL); 176 if (in_ifaddr) { 177 /* 178 * If the destination address is INADDR_ANY, 179 * use the primary local address. 180 * If the supplied address is INADDR_BROADCAST, 181 * and the primary interface supports broadcast, 182 * choose the broadcast address for that interface. 183 */ 184 if (sin->sin_addr.s_addr == INADDR_ANY) 185 sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr; 186 else if (sin->sin_addr.s_addr == INADDR_BROADCAST && 187 (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST)) 188 sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr; 189 } 190 if (inp->inp_laddr.s_addr == INADDR_ANY) { 191 register struct route *ro; 192 193 ia = (struct in_ifaddr *)0; 194 /* 195 * If route is known or can be allocated now, 196 * our src addr is taken from the i/f, else punt. 197 */ 198 ro = &inp->inp_route; 199 if (ro->ro_rt && 200 (satosin(&ro->ro_dst)->sin_addr.s_addr != 201 sin->sin_addr.s_addr || 202 inp->inp_socket->so_options & SO_DONTROUTE)) { 203 RTFREE(ro->ro_rt); 204 ro->ro_rt = (struct rtentry *)0; 205 } 206 if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/ 207 (ro->ro_rt == (struct rtentry *)0 || 208 ro->ro_rt->rt_ifp == (struct ifnet *)0)) { 209 /* No route yet, so try to acquire one */ 210 ro->ro_dst.sa_family = AF_INET; 211 ro->ro_dst.sa_len = sizeof(struct sockaddr_in); 212 satosin(&ro->ro_dst)->sin_addr = sin->sin_addr; 213 rtalloc(ro); 214 } 215 /* 216 * If we found a route, use the address 217 * corresponding to the outgoing interface 218 * unless it is the loopback (in case a route 219 * to our address on another net goes to loopback). 220 */ 221 if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) 222 ia = ifatoia(ro->ro_rt->rt_ifa); 223 if (ia == 0) { 224 u_int16_t fport = sin->sin_port; 225 226 sin->sin_port = 0; 227 ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin))); 228 if (ia == 0) 229 ia = ifatoia(ifa_ifwithnet(sintosa(sin))); 230 sin->sin_port = fport; 231 if (ia == 0) 232 ia = in_ifaddr; 233 if (ia == 0) 234 return (EADDRNOTAVAIL); 235 } 236 /* 237 * If the destination address is multicast and an outgoing 238 * interface has been set as a multicast option, use the 239 * address of that interface as our source address. 240 */ 241 if (IN_MULTICAST(sin->sin_addr.s_addr) && 242 inp->inp_moptions != NULL) { 243 struct ip_moptions *imo; 244 struct ifnet *ifp; 245 246 imo = inp->inp_moptions; 247 if (imo->imo_multicast_ifp != NULL) { 248 ifp = imo->imo_multicast_ifp; 249 for (ia = in_ifaddr; ia; ia = ia->ia_next) 250 if (ia->ia_ifp == ifp) 251 break; 252 if (ia == 0) 253 return (EADDRNOTAVAIL); 254 } 255 } 256 ifaddr = satosin(&ia->ia_addr); 257 } 258 if (in_pcblookup(inp->inp_head, 259 sin->sin_addr, 260 sin->sin_port, 261 inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, 262 inp->inp_lport, 263 0)) 264 return (EADDRINUSE); 265 if (inp->inp_laddr.s_addr == INADDR_ANY) { 266 if (inp->inp_lport == 0) 267 (void)in_pcbbind(inp, (struct mbuf *)0); 268 inp->inp_laddr = ifaddr->sin_addr; 269 } 270 inp->inp_faddr = sin->sin_addr; 271 inp->inp_fport = sin->sin_port; 272 return (0); 273 } 274 275 int 276 in_pcbdisconnect(inp) 277 struct inpcb *inp; 278 { 279 280 inp->inp_faddr.s_addr = INADDR_ANY; 281 inp->inp_fport = 0; 282 if (inp->inp_socket->so_state & SS_NOFDREF) 283 in_pcbdetach(inp); 284 } 285 286 int 287 in_pcbdetach(inp) 288 struct inpcb *inp; 289 { 290 struct socket *so = inp->inp_socket; 291 292 so->so_pcb = 0; 293 sofree(so); 294 if (inp->inp_options) 295 (void)m_free(inp->inp_options); 296 if (inp->inp_route.ro_rt) 297 rtfree(inp->inp_route.ro_rt); 298 ip_freemoptions(inp->inp_moptions); 299 remque(inp); 300 FREE(inp, M_PCB); 301 } 302 303 int 304 in_setsockaddr(inp, nam) 305 register struct inpcb *inp; 306 struct mbuf *nam; 307 { 308 register struct sockaddr_in *sin; 309 310 nam->m_len = sizeof (*sin); 311 sin = mtod(nam, struct sockaddr_in *); 312 bzero((caddr_t)sin, sizeof (*sin)); 313 sin->sin_family = AF_INET; 314 sin->sin_len = sizeof(*sin); 315 sin->sin_port = inp->inp_lport; 316 sin->sin_addr = inp->inp_laddr; 317 } 318 319 int 320 in_setpeeraddr(inp, nam) 321 struct inpcb *inp; 322 struct mbuf *nam; 323 { 324 register struct sockaddr_in *sin; 325 326 nam->m_len = sizeof (*sin); 327 sin = mtod(nam, struct sockaddr_in *); 328 bzero((caddr_t)sin, sizeof (*sin)); 329 sin->sin_family = AF_INET; 330 sin->sin_len = sizeof(*sin); 331 sin->sin_port = inp->inp_fport; 332 sin->sin_addr = inp->inp_faddr; 333 } 334 335 /* 336 * Pass some notification to all connections of a protocol 337 * associated with address dst. The local address and/or port numbers 338 * may be specified to limit the search. The "usual action" will be 339 * taken, depending on the ctlinput cmd. The caller must filter any 340 * cmds that are uninteresting (e.g., no error in the map). 341 * Call the protocol specific routine (if any) to report 342 * any errors for each matching socket. 343 * 344 * Must be called at splnet. 345 */ 346 int 347 in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify) 348 struct inpcb *head; 349 struct sockaddr *dst; 350 u_int fport_arg, lport_arg; 351 struct in_addr laddr; 352 int cmd; 353 void (*notify) __P((struct inpcb *, int)); 354 { 355 extern u_char inetctlerrmap[]; 356 register struct inpcb *inp, *oinp; 357 struct in_addr faddr; 358 u_int16_t fport = fport_arg, lport = lport_arg; 359 int errno; 360 361 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET) 362 return; 363 faddr = satosin(dst)->sin_addr; 364 if (faddr.s_addr == INADDR_ANY) 365 return; 366 367 /* 368 * Redirects go to all references to the destination, 369 * and use in_rtchange to invalidate the route cache. 370 * Dead host indications: notify all references to the destination. 371 * Otherwise, if we have knowledge of the local port and address, 372 * deliver only to that socket. 373 */ 374 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 375 fport = 0; 376 lport = 0; 377 laddr.s_addr = 0; 378 if (cmd != PRC_HOSTDEAD) 379 notify = in_rtchange; 380 } 381 errno = inetctlerrmap[cmd]; 382 for (inp = head->inp_next; inp != head;) { 383 if (inp->inp_faddr.s_addr != faddr.s_addr || 384 inp->inp_socket == 0 || 385 (lport && inp->inp_lport != lport) || 386 (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) || 387 (fport && inp->inp_fport != fport)) { 388 inp = inp->inp_next; 389 continue; 390 } 391 oinp = inp; 392 inp = inp->inp_next; 393 if (notify) 394 (*notify)(oinp, errno); 395 } 396 } 397 398 /* 399 * Check for alternatives when higher level complains 400 * about service problems. For now, invalidate cached 401 * routing information. If the route was created dynamically 402 * (by a redirect), time to try a default gateway again. 403 */ 404 int 405 in_losing(inp) 406 struct inpcb *inp; 407 { 408 register struct rtentry *rt; 409 struct rt_addrinfo info; 410 411 if ((rt = inp->inp_route.ro_rt)) { 412 inp->inp_route.ro_rt = 0; 413 bzero((caddr_t)&info, sizeof(info)); 414 info.rti_info[RTAX_DST] = sintosa(&inp->inp_route.ro_dst); 415 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 416 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 417 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 418 if (rt->rt_flags & RTF_DYNAMIC) 419 (void) rtrequest(RTM_DELETE, rt_key(rt), 420 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 421 (struct rtentry **)0); 422 else 423 /* 424 * A new route can be allocated 425 * the next time output is attempted. 426 */ 427 rtfree(rt); 428 } 429 } 430 431 /* 432 * After a routing change, flush old routing 433 * and allocate a (hopefully) better one. 434 */ 435 void 436 in_rtchange(inp, errno) 437 register struct inpcb *inp; 438 int errno; 439 { 440 if (inp->inp_route.ro_rt) { 441 rtfree(inp->inp_route.ro_rt); 442 inp->inp_route.ro_rt = 0; 443 /* 444 * A new route can be allocated the next time 445 * output is attempted. 446 */ 447 } 448 } 449 450 struct inpcb * 451 in_pcblookup(head, faddr, fport_arg, laddr, lport_arg, flags) 452 struct inpcb *head; 453 struct in_addr faddr, laddr; 454 u_int fport_arg, lport_arg; 455 int flags; 456 { 457 register struct inpcb *inp, *match = 0; 458 int matchwild = 3, wildcard; 459 u_int16_t fport = fport_arg, lport = lport_arg; 460 461 for (inp = head->inp_next; inp != head; inp = inp->inp_next) { 462 if (inp->inp_lport != lport) 463 continue; 464 wildcard = 0; 465 if (inp->inp_laddr.s_addr != INADDR_ANY) { 466 if (laddr.s_addr == INADDR_ANY) 467 wildcard++; 468 else if (inp->inp_laddr.s_addr != laddr.s_addr) 469 continue; 470 } else { 471 if (laddr.s_addr != INADDR_ANY) 472 wildcard++; 473 } 474 if (inp->inp_faddr.s_addr != INADDR_ANY) { 475 if (faddr.s_addr == INADDR_ANY) 476 wildcard++; 477 else if (inp->inp_faddr.s_addr != faddr.s_addr || 478 inp->inp_fport != fport) 479 continue; 480 } else { 481 if (faddr.s_addr != INADDR_ANY) 482 wildcard++; 483 } 484 if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0) 485 continue; 486 if (wildcard < matchwild) { 487 match = inp; 488 matchwild = wildcard; 489 if (matchwild == 0) 490 break; 491 } 492 } 493 return (match); 494 } 495
Indexes created Tue Sep 23 14:10:03 GMT 2025