rtsock.c revision 1.248
1 /* $NetBSD: rtsock.c,v 1.248 2019/03/01 11:06:57 pgoyette Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1988, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95 61 */ 62 63 #include <sys/cdefs.h> 64 __KERNEL_RCSID(0, "$NetBSD: rtsock.c,v 1.248 2019/03/01 11:06:57 pgoyette Exp $"); 65 66 #ifdef _KERNEL_OPT 67 #include "opt_inet.h" 68 #include "opt_compat_netbsd.h" 69 #endif 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/proc.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/sysctl.h> 79 #include <sys/kauth.h> 80 #include <sys/kmem.h> 81 #include <sys/intr.h> 82 #include <sys/condvar.h> 83 #include <sys/compat_stub.h> 84 85 #include <net/if.h> 86 #include <net/if_llatbl.h> 87 #include <net/if_types.h> 88 #include <net/route.h> 89 #include <net/raw_cb.h> 90 91 #include <netinet/in_var.h> 92 #include <netinet/if_inarp.h> 93 94 #include <netmpls/mpls.h> 95 96 #include <compat/net/if.h> 97 #include <compat/net/route.h> 98 99 #ifdef COMPAT_RTSOCK 100 #undef COMPAT_RTSOCK 101 #endif 102 103 static int if_addrflags(struct ifaddr *); 104 static void sysctl_net_route_setup(struct sysctllog **); 105 106 #include <net/rtsock_shared.c> 107 108 /* 109 * XXX avoid using void * once msghdr compat disappears. 110 */ 111 void 112 rt_setmetrics(void *in, struct rtentry *out) 113 { 114 const struct rt_xmsghdr *rtm = in; 115 116 _rt_setmetrics(rtm->rtm_inits, rtm, out); 117 } 118 119 int 120 rt_msg3(int type, struct rt_addrinfo *rtinfo, void *cpv, struct rt_walkarg *w, 121 int *lenp) 122 { 123 return rt_msg2(type, rtinfo, cpv, w, lenp); 124 } 125 126 static int 127 if_addrflags(struct ifaddr *ifa) 128 { 129 130 switch (ifa->ifa_addr->sa_family) { 131 #ifdef INET 132 case AF_INET: 133 return ((struct in_ifaddr *)ifa)->ia4_flags; 134 #endif 135 #ifdef INET6 136 case AF_INET6: 137 return ((struct in6_ifaddr *)ifa)->ia6_flags; 138 #endif 139 default: 140 return 0; 141 } 142 } 143 144 145 /* 146 * Send a routing message as mimicing that a cloned route is added. 147 */ 148 void 149 rt_clonedmsg(const struct sockaddr *dst, const struct ifnet *ifp, 150 const struct rtentry *rt) 151 { 152 struct rt_addrinfo info; 153 /* Mimic flags exactly */ 154 #define RTF_LLINFO 0x400 155 #define RTF_CLONED 0x2000 156 int flags = RTF_UP | RTF_HOST | RTF_DONE | RTF_LLINFO | RTF_CLONED; 157 union { 158 struct sockaddr sa; 159 struct sockaddr_storage ss; 160 struct sockaddr_dl sdl; 161 } u; 162 uint8_t namelen = strlen(ifp->if_xname); 163 uint8_t addrlen = ifp->if_addrlen; 164 165 if (rt == NULL) 166 return; /* XXX */ 167 168 memset(&info, 0, sizeof(info)); 169 info.rti_info[RTAX_DST] = dst; 170 sockaddr_dl_init(&u.sdl, sizeof(u.ss), ifp->if_index, ifp->if_type, 171 NULL, namelen, NULL, addrlen); 172 info.rti_info[RTAX_GATEWAY] = &u.sa; 173 174 rt_missmsg(RTM_ADD, &info, flags, 0); 175 #undef RTF_LLINFO 176 #undef RTF_CLONED 177 } 178 179 180 /* 181 * The remaining code implements the routing-table sysctl node. It is 182 * compiled only for the non-COMPAT case. 183 */ 184 185 /* 186 * This is used in dumping the kernel table via sysctl(). 187 */ 188 static int 189 sysctl_dumpentry(struct rtentry *rt, void *v) 190 { 191 struct rt_walkarg *w = v; 192 int error = 0, size; 193 struct rt_addrinfo info; 194 195 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg)) 196 return 0; 197 memset(&info, 0, sizeof(info)); 198 info.rti_info[RTAX_DST] = rt_getkey(rt); 199 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 200 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 201 info.rti_info[RTAX_TAG] = rt_gettag(rt); 202 if (rt->rt_ifp) { 203 const struct ifaddr *rtifa; 204 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_dl->ifa_addr; 205 /* rtifa used to be simply rt->rt_ifa. If rt->rt_ifa != NULL, 206 * then rt_get_ifa() != NULL. So this ought to still be safe. 207 * --dyoung 208 */ 209 rtifa = rt_get_ifa(rt); 210 info.rti_info[RTAX_IFA] = rtifa->ifa_addr; 211 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT) 212 info.rti_info[RTAX_BRD] = rtifa->ifa_dstaddr; 213 } 214 if ((error = rt_msg2(RTM_GET, &info, 0, w, &size))) 215 return error; 216 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 217 struct rt_xmsghdr *rtm = (struct rt_xmsghdr *)w->w_tmem; 218 219 rtm->rtm_flags = rt->rt_flags; 220 rtm->rtm_use = rt->rt_use; 221 rtm_setmetrics(rt, rtm); 222 KASSERT(rt->rt_ifp != NULL); 223 rtm->rtm_index = rt->rt_ifp->if_index; 224 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0; 225 rtm->rtm_addrs = info.rti_addrs; 226 if ((error = copyout(rtm, w->w_where, size)) != 0) 227 w->w_where = NULL; 228 else 229 w->w_where = (char *)w->w_where + size; 230 } 231 return error; 232 } 233 234 static int 235 sysctl_iflist_if(struct ifnet *ifp, struct rt_walkarg *w, 236 struct rt_addrinfo *info, size_t len) 237 { 238 struct if_xmsghdr *ifm; 239 int error; 240 241 ifm = (struct if_xmsghdr *)w->w_tmem; 242 ifm->ifm_index = ifp->if_index; 243 ifm->ifm_flags = ifp->if_flags; 244 ifm->ifm_data = ifp->if_data; 245 ifm->ifm_addrs = info->rti_addrs; 246 if ((error = copyout(ifm, w->w_where, len)) == 0) 247 w->w_where = (char *)w->w_where + len; 248 return error; 249 } 250 251 static int 252 sysctl_iflist_addr(struct rt_walkarg *w, struct ifaddr *ifa, 253 struct rt_addrinfo *info) 254 { 255 int len, error; 256 257 if ((error = rt_msg2(RTM_XNEWADDR, info, 0, w, &len))) 258 return error; 259 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 260 struct ifa_xmsghdr *ifam; 261 262 ifam = (struct ifa_xmsghdr *)w->w_tmem; 263 ifam->ifam_index = ifa->ifa_ifp->if_index; 264 ifam->ifam_flags = ifa->ifa_flags; 265 ifam->ifam_metric = ifa->ifa_metric; 266 ifam->ifam_addrs = info->rti_addrs; 267 ifam->ifam_pid = 0; 268 ifam->ifam_addrflags = if_addrflags(ifa); 269 if ((error = copyout(w->w_tmem, w->w_where, len)) == 0) 270 w->w_where = (char *)w->w_where + len; 271 } 272 return error; 273 } 274 275 static int 276 sysctl_iflist(int af, struct rt_walkarg *w, int type) 277 { 278 struct ifnet *ifp; 279 struct ifaddr *ifa; 280 struct rt_addrinfo info; 281 int cmd, len, error = 0; 282 int s; 283 struct psref psref; 284 int bound; 285 286 switch (type) { 287 case NET_RT_IFLIST: 288 cmd = RTM_IFINFO; 289 break; 290 case NET_RT_OOOIFLIST: 291 cmd = RTM_OOIFINFO; 292 break; 293 case NET_RT_OOIFLIST: 294 cmd = RTM_OIFINFO; 295 break; 296 case NET_RT_OIFLIST: 297 cmd = RTM_IFINFO; 298 break; 299 default: 300 #ifdef RTSOCK_DEBUG 301 printf("%s: unsupported IFLIST type %d\n", __func__, type); 302 #endif 303 return EINVAL; 304 } 305 306 memset(&info, 0, sizeof(info)); 307 308 bound = curlwp_bind(); 309 s = pserialize_read_enter(); 310 IFNET_READER_FOREACH(ifp) { 311 int _s; 312 if (w->w_arg && w->w_arg != ifp->if_index) 313 continue; 314 if (IFADDR_READER_EMPTY(ifp)) 315 continue; 316 317 if_acquire(ifp, &psref); 318 pserialize_read_exit(s); 319 320 info.rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr; 321 if ((error = rt_msg2(cmd, &info, NULL, w, &len)) != 0) 322 goto release_exit; 323 info.rti_info[RTAX_IFP] = NULL; 324 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 325 switch (type) { 326 case NET_RT_OIFLIST: /* old _70 */ 327 if (!rtsock_iflist_70_hook.hooked) { 328 error = EINVAL; 329 break; 330 } 331 /* FALLTHROUGH */ 332 case NET_RT_IFLIST: /* current */ 333 error = sysctl_iflist_if(ifp, w, &info, len); 334 break; 335 case NET_RT_OOIFLIST: /* old _50 */ 336 MODULE_HOOK_CALL(rtsock_iflist_50_hook, 337 (ifp, w, &info, len), enosys(), error); 338 break; 339 case NET_RT_OOOIFLIST: /* old _14 */ 340 MODULE_HOOK_CALL(rtsock_iflist_14_hook, 341 (ifp, w, &info, len), enosys(), error); 342 break; 343 default: 344 error = EINVAL; 345 } 346 if (error != 0) { 347 if (error == ENOSYS) 348 error = EINVAL; 349 goto release_exit; 350 } 351 } 352 _s = pserialize_read_enter(); 353 IFADDR_READER_FOREACH(ifa, ifp) { 354 struct psref _psref; 355 if (af && af != ifa->ifa_addr->sa_family) 356 continue; 357 ifa_acquire(ifa, &_psref); 358 pserialize_read_exit(_s); 359 360 info.rti_info[RTAX_IFA] = ifa->ifa_addr; 361 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 362 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr; 363 switch (type) { 364 case NET_RT_IFLIST: 365 error = sysctl_iflist_addr(w, ifa, &info); 366 break; 367 case NET_RT_OIFLIST: 368 case NET_RT_OOIFLIST: 369 case NET_RT_OOOIFLIST: 370 MODULE_HOOK_CALL(rtsock_iflist_70_hook, 371 (w, ifa, &info), enosys(), error); 372 break; 373 default: 374 error = EINVAL; 375 } 376 377 _s = pserialize_read_enter(); 378 ifa_release(ifa, &_psref); 379 if (error != 0) { 380 pserialize_read_exit(_s); 381 goto release_exit; 382 } 383 } 384 pserialize_read_exit(_s); 385 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] = 386 info.rti_info[RTAX_BRD] = NULL; 387 388 s = pserialize_read_enter(); 389 if_release(ifp, &psref); 390 } 391 pserialize_read_exit(s); 392 curlwp_bindx(bound); 393 394 return 0; 395 396 release_exit: 397 if_release(ifp, &psref); 398 curlwp_bindx(bound); 399 return error; 400 } 401 402 static int 403 sysctl_rtable(SYSCTLFN_ARGS) 404 { 405 void *where = oldp; 406 size_t *given = oldlenp; 407 int i, s, error = EINVAL; 408 u_char af; 409 struct rt_walkarg w; 410 411 if (namelen == 1 && name[0] == CTL_QUERY) 412 return sysctl_query(SYSCTLFN_CALL(rnode)); 413 414 if (newp) 415 return EPERM; 416 if (namelen != 3) 417 return EINVAL; 418 af = name[0]; 419 w.w_tmemneeded = 0; 420 w.w_tmemsize = 0; 421 w.w_tmem = NULL; 422 again: 423 /* we may return here if a later [re]alloc of the t_mem buffer fails */ 424 if (w.w_tmemneeded) { 425 w.w_tmem = kmem_zalloc(w.w_tmemneeded, KM_SLEEP); 426 w.w_tmemsize = w.w_tmemneeded; 427 w.w_tmemneeded = 0; 428 } 429 w.w_op = name[1]; 430 w.w_arg = name[2]; 431 w.w_given = *given; 432 w.w_needed = 0 - w.w_given; 433 w.w_where = where; 434 435 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 436 s = splsoftnet(); 437 switch (w.w_op) { 438 439 case NET_RT_DUMP: 440 case NET_RT_FLAGS: 441 #if defined(INET) || defined(INET6) 442 /* 443 * take care of llinfo entries, the caller must 444 * specify an AF 445 */ 446 if (w.w_op == NET_RT_FLAGS && 447 (w.w_arg == 0 || w.w_arg & RTF_LLDATA)) { 448 if (af != 0) 449 error = lltable_sysctl_dump(af, &w); 450 else 451 error = EINVAL; 452 break; 453 } 454 #endif 455 456 for (i = 1; i <= AF_MAX; i++) { 457 if (af == 0 || af == i) { 458 error = rt_walktree(i, sysctl_dumpentry, &w); 459 if (error != 0) 460 break; 461 #if defined(INET) || defined(INET6) 462 /* 463 * Return ARP/NDP entries too for 464 * backward compatibility. 465 */ 466 error = lltable_sysctl_dump(i, &w); 467 if (error != 0) 468 break; 469 #endif 470 } 471 } 472 break; 473 474 case NET_RT_OOOIFLIST: /* compat_14 */ 475 case NET_RT_OOIFLIST: /* compat_50 */ 476 case NET_RT_OIFLIST: /* compat_70 */ 477 case NET_RT_IFLIST: /* current */ 478 error = sysctl_iflist(af, &w, w.w_op); 479 break; 480 } 481 splx(s); 482 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 483 484 /* check to see if we couldn't allocate memory with NOWAIT */ 485 if (error == ENOBUFS && w.w_tmem == 0 && w.w_tmemneeded) 486 goto again; 487 488 if (w.w_tmem) 489 kmem_free(w.w_tmem, w.w_tmemsize); 490 w.w_needed += w.w_given; 491 if (where) { 492 *given = (char *)w.w_where - (char *)where; 493 if (*given < w.w_needed) 494 return ENOMEM; 495 } else { 496 *given = (11 * w.w_needed) / 10; 497 } 498 return error; 499 } 500 501 static void 502 sysctl_net_route_setup(struct sysctllog **clog) 503 { 504 const struct sysctlnode *rnode = NULL; 505 506 sysctl_createv(clog, 0, NULL, &rnode, 507 CTLFLAG_PERMANENT, 508 CTLTYPE_NODE, DOMAINNAME, 509 SYSCTL_DESCR("PF_ROUTE information"), 510 NULL, 0, NULL, 0, 511 CTL_NET, PF_XROUTE, CTL_EOL); 512 513 sysctl_createv(clog, 0, NULL, NULL, 514 CTLFLAG_PERMANENT, 515 CTLTYPE_NODE, "rtable", 516 SYSCTL_DESCR("Routing table information"), 517 sysctl_rtable, 0, NULL, 0, 518 CTL_NET, PF_XROUTE, 0 /* any protocol */, CTL_EOL); 519 520 sysctl_createv(clog, 0, &rnode, NULL, 521 CTLFLAG_PERMANENT, 522 CTLTYPE_STRUCT, "stats", 523 SYSCTL_DESCR("Routing statistics"), 524 NULL, 0, &rtstat, sizeof(rtstat), 525 CTL_CREATE, CTL_EOL); 526 } 527
Indexes created Mon Sep 22 13:09:51 GMT 2025