| 1 | /* $NetBSD: ip_input.c,v 1.344 2016/10/18 07:30:31 ozaki-r 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) 1998 The NetBSD Foundation, Inc. |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * This code is derived from software contributed to The NetBSD Foundation |
| 37 | * by Public Access Networks Corporation ("Panix"). It was developed under |
| 38 | * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. |
| 39 | * |
| 40 | * Redistribution and use in source and binary forms, with or without |
| 41 | * modification, are permitted provided that the following conditions |
| 42 | * are met: |
| 43 | * 1. Redistributions of source code must retain the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer. |
| 45 | * 2. Redistributions in binary form must reproduce the above copyright |
| 46 | * notice, this list of conditions and the following disclaimer in the |
| 47 | * documentation and/or other materials provided with the distribution. |
| 48 | * |
| 49 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 50 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 51 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 52 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 53 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 54 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 55 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 56 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 57 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 58 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 59 | * POSSIBILITY OF SUCH DAMAGE. |
| 60 | */ |
| 61 | |
| 62 | /* |
| 63 | * Copyright (c) 1982, 1986, 1988, 1993 |
| 64 | * The Regents of the University of California. All rights reserved. |
| 65 | * |
| 66 | * Redistribution and use in source and binary forms, with or without |
| 67 | * modification, are permitted provided that the following conditions |
| 68 | * are met: |
| 69 | * 1. Redistributions of source code must retain the above copyright |
| 70 | * notice, this list of conditions and the following disclaimer. |
| 71 | * 2. Redistributions in binary form must reproduce the above copyright |
| 72 | * notice, this list of conditions and the following disclaimer in the |
| 73 | * documentation and/or other materials provided with the distribution. |
| 74 | * 3. Neither the name of the University nor the names of its contributors |
| 75 | * may be used to endorse or promote products derived from this software |
| 76 | * without specific prior written permission. |
| 77 | * |
| 78 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 79 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 80 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 81 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 82 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 83 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 84 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 85 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 86 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 87 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 88 | * SUCH DAMAGE. |
| 89 | * |
| 90 | * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
| 91 | */ |
| 92 | |
| 93 | #include <sys/cdefs.h> |
| 94 | __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.344 2016/10/18 07:30:31 ozaki-r Exp $" ); |
| 95 | |
| 96 | #ifdef _KERNEL_OPT |
| 97 | #include "opt_inet.h" |
| 98 | #include "opt_compat_netbsd.h" |
| 99 | #include "opt_gateway.h" |
| 100 | #include "opt_ipsec.h" |
| 101 | #include "opt_mrouting.h" |
| 102 | #include "opt_mbuftrace.h" |
| 103 | #include "opt_inet_csum.h" |
| 104 | #include "opt_net_mpsafe.h" |
| 105 | #endif |
| 106 | |
| 107 | #include "arp.h" |
| 108 | |
| 109 | #include <sys/param.h> |
| 110 | #include <sys/systm.h> |
| 111 | #include <sys/cpu.h> |
| 112 | #include <sys/mbuf.h> |
| 113 | #include <sys/domain.h> |
| 114 | #include <sys/protosw.h> |
| 115 | #include <sys/socket.h> |
| 116 | #include <sys/socketvar.h> |
| 117 | #include <sys/errno.h> |
| 118 | #include <sys/time.h> |
| 119 | #include <sys/kernel.h> |
| 120 | #include <sys/pool.h> |
| 121 | #include <sys/sysctl.h> |
| 122 | #include <sys/kauth.h> |
| 123 | |
| 124 | #include <net/if.h> |
| 125 | #include <net/if_dl.h> |
| 126 | #include <net/route.h> |
| 127 | #include <net/pktqueue.h> |
| 128 | #include <net/pfil.h> |
| 129 | |
| 130 | #include <netinet/in.h> |
| 131 | #include <netinet/in_systm.h> |
| 132 | #include <netinet/ip.h> |
| 133 | #include <netinet/in_pcb.h> |
| 134 | #include <netinet/in_proto.h> |
| 135 | #include <netinet/in_var.h> |
| 136 | #include <netinet/ip_var.h> |
| 137 | #include <netinet/ip_private.h> |
| 138 | #include <netinet/ip_icmp.h> |
| 139 | /* just for gif_ttl */ |
| 140 | #include <netinet/in_gif.h> |
| 141 | #include "gif.h" |
| 142 | #include <net/if_gre.h> |
| 143 | #include "gre.h" |
| 144 | |
| 145 | #ifdef MROUTING |
| 146 | #include <netinet/ip_mroute.h> |
| 147 | #endif |
| 148 | #include <netinet/portalgo.h> |
| 149 | |
| 150 | #ifdef IPSEC |
| 151 | #include <netipsec/ipsec.h> |
| 152 | #endif |
| 153 | |
| 154 | #ifndef IPFORWARDING |
| 155 | #ifdef GATEWAY |
| 156 | #define IPFORWARDING 1 /* forward IP packets not for us */ |
| 157 | #else /* GATEWAY */ |
| 158 | #define IPFORWARDING 0 /* don't forward IP packets not for us */ |
| 159 | #endif /* GATEWAY */ |
| 160 | #endif /* IPFORWARDING */ |
| 161 | #ifndef IPSENDREDIRECTS |
| 162 | #define IPSENDREDIRECTS 1 |
| 163 | #endif |
| 164 | #ifndef IPFORWSRCRT |
| 165 | #define IPFORWSRCRT 1 /* forward source-routed packets */ |
| 166 | #endif |
| 167 | #ifndef IPALLOWSRCRT |
| 168 | #define IPALLOWSRCRT 1 /* allow source-routed packets */ |
| 169 | #endif |
| 170 | #ifndef IPMTUDISC |
| 171 | #define IPMTUDISC 1 |
| 172 | #endif |
| 173 | #ifndef IPMTUDISCTIMEOUT |
| 174 | #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ |
| 175 | #endif |
| 176 | |
| 177 | #ifdef COMPAT_50 |
| 178 | #include <compat/sys/time.h> |
| 179 | #include <compat/sys/socket.h> |
| 180 | #endif |
| 181 | |
| 182 | /* |
| 183 | * Note: DIRECTED_BROADCAST is handled this way so that previous |
| 184 | * configuration using this option will Just Work. |
| 185 | */ |
| 186 | #ifndef IPDIRECTEDBCAST |
| 187 | #ifdef DIRECTED_BROADCAST |
| 188 | #define IPDIRECTEDBCAST 1 |
| 189 | #else |
| 190 | #define IPDIRECTEDBCAST 0 |
| 191 | #endif /* DIRECTED_BROADCAST */ |
| 192 | #endif /* IPDIRECTEDBCAST */ |
| 193 | int ipforwarding = IPFORWARDING; |
| 194 | int ipsendredirects = IPSENDREDIRECTS; |
| 195 | int ip_defttl = IPDEFTTL; |
| 196 | int ip_forwsrcrt = IPFORWSRCRT; |
| 197 | int ip_directedbcast = IPDIRECTEDBCAST; |
| 198 | int ip_allowsrcrt = IPALLOWSRCRT; |
| 199 | int ip_mtudisc = IPMTUDISC; |
| 200 | int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; |
| 201 | #ifdef DIAGNOSTIC |
| 202 | int ipprintfs = 0; |
| 203 | #endif |
| 204 | |
| 205 | int ip_do_randomid = 0; |
| 206 | |
| 207 | /* |
| 208 | * XXX - Setting ip_checkinterface mostly implements the receive side of |
| 209 | * the Strong ES model described in RFC 1122, but since the routing table |
| 210 | * and transmit implementation do not implement the Strong ES model, |
| 211 | * setting this to 1 results in an odd hybrid. |
| 212 | * |
| 213 | * XXX - ip_checkinterface currently must be disabled if you use ipnat |
| 214 | * to translate the destination address to another local interface. |
| 215 | * |
| 216 | * XXX - ip_checkinterface must be disabled if you add IP aliases |
| 217 | * to the loopback interface instead of the interface where the |
| 218 | * packets for those addresses are received. |
| 219 | */ |
| 220 | static int ip_checkinterface __read_mostly = 0; |
| 221 | |
| 222 | struct rttimer_queue *ip_mtudisc_timeout_q = NULL; |
| 223 | |
| 224 | pktqueue_t * ip_pktq __read_mostly; |
| 225 | pfil_head_t * inet_pfil_hook __read_mostly; |
| 226 | ipid_state_t * ip_ids __read_mostly; |
| 227 | percpu_t * ipstat_percpu __read_mostly; |
| 228 | |
| 229 | static percpu_t *ipforward_rt_percpu __cacheline_aligned; |
| 230 | |
| 231 | uint16_t ip_id; |
| 232 | |
| 233 | #ifdef INET_CSUM_COUNTERS |
| 234 | #include <sys/device.h> |
| 235 | |
| 236 | struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 237 | NULL, "inet" , "hwcsum bad" ); |
| 238 | struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 239 | NULL, "inet" , "hwcsum ok" ); |
| 240 | struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 241 | NULL, "inet" , "swcsum" ); |
| 242 | |
| 243 | #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ |
| 244 | |
| 245 | EVCNT_ATTACH_STATIC(ip_hwcsum_bad); |
| 246 | EVCNT_ATTACH_STATIC(ip_hwcsum_ok); |
| 247 | EVCNT_ATTACH_STATIC(ip_swcsum); |
| 248 | |
| 249 | #else |
| 250 | |
| 251 | #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ |
| 252 | |
| 253 | #endif /* INET_CSUM_COUNTERS */ |
| 254 | |
| 255 | /* |
| 256 | * We need to save the IP options in case a protocol wants to respond |
| 257 | * to an incoming packet over the same route if the packet got here |
| 258 | * using IP source routing. This allows connection establishment and |
| 259 | * maintenance when the remote end is on a network that is not known |
| 260 | * to us. |
| 261 | */ |
| 262 | |
| 263 | static int ip_nhops = 0; |
| 264 | |
| 265 | static struct ip_srcrt { |
| 266 | struct in_addr dst; /* final destination */ |
| 267 | char nop; /* one NOP to align */ |
| 268 | char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ |
| 269 | struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; |
| 270 | } ip_srcrt; |
| 271 | |
| 272 | static int ip_drainwanted; |
| 273 | |
| 274 | struct sockaddr_in ipaddr = { |
| 275 | .sin_len = sizeof(ipaddr), |
| 276 | .sin_family = AF_INET, |
| 277 | }; |
| 278 | |
| 279 | static void save_rte(u_char *, struct in_addr); |
| 280 | |
| 281 | #ifdef MBUFTRACE |
| 282 | struct mowner ip_rx_mowner = MOWNER_INIT("internet" , "rx" ); |
| 283 | struct mowner ip_tx_mowner = MOWNER_INIT("internet" , "tx" ); |
| 284 | #endif |
| 285 | |
| 286 | static void ipintr(void *); |
| 287 | static void ip_input(struct mbuf *); |
| 288 | static void ip_forward(struct mbuf *, int, struct ifnet *); |
| 289 | static bool ip_dooptions(struct mbuf *); |
| 290 | static struct in_ifaddr *ip_rtaddr(struct in_addr); |
| 291 | static void sysctl_net_inet_ip_setup(struct sysctllog **); |
| 292 | |
| 293 | static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, |
| 294 | int *); |
| 295 | static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, |
| 296 | struct ip *); |
| 297 | |
| 298 | #ifdef NET_MPSAFE |
| 299 | #define SOFTNET_LOCK() mutex_enter(softnet_lock) |
| 300 | #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) |
| 301 | #else |
| 302 | #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) |
| 303 | #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) |
| 304 | #endif |
| 305 | |
| 306 | /* |
| 307 | * IP initialization: fill in IP protocol switch table. |
| 308 | * All protocols not implemented in kernel go to raw IP protocol handler. |
| 309 | */ |
| 310 | void |
| 311 | ip_init(void) |
| 312 | { |
| 313 | const struct protosw *pr; |
| 314 | |
| 315 | in_init(); |
| 316 | sysctl_net_inet_ip_setup(NULL); |
| 317 | |
| 318 | pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); |
| 319 | KASSERT(pr != NULL); |
| 320 | |
| 321 | ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); |
| 322 | KASSERT(ip_pktq != NULL); |
| 323 | |
| 324 | for (u_int i = 0; i < IPPROTO_MAX; i++) { |
| 325 | ip_protox[i] = pr - inetsw; |
| 326 | } |
| 327 | for (pr = inetdomain.dom_protosw; |
| 328 | pr < inetdomain.dom_protoswNPROTOSW; pr++) |
| 329 | if (pr->pr_domain->dom_family == PF_INET && |
| 330 | pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) |
| 331 | ip_protox[pr->pr_protocol] = pr - inetsw; |
| 332 | |
| 333 | ip_reass_init(); |
| 334 | |
| 335 | ip_ids = ip_id_init(); |
| 336 | ip_id = time_uptime & 0xfffff; |
| 337 | |
| 338 | ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); |
| 339 | #ifdef GATEWAY |
| 340 | ipflow_init(); |
| 341 | #endif |
| 342 | |
| 343 | /* Register our Packet Filter hook. */ |
| 344 | inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); |
| 345 | KASSERT(inet_pfil_hook != NULL); |
| 346 | |
| 347 | #ifdef MBUFTRACE |
| 348 | MOWNER_ATTACH(&ip_tx_mowner); |
| 349 | MOWNER_ATTACH(&ip_rx_mowner); |
| 350 | #endif /* MBUFTRACE */ |
| 351 | |
| 352 | ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); |
| 353 | |
| 354 | ipforward_rt_percpu = percpu_alloc(sizeof(struct route)); |
| 355 | if (ipforward_rt_percpu == NULL) |
| 356 | panic("failed to allocate ipforward_rt_percpu" ); |
| 357 | } |
| 358 | |
| 359 | static struct in_ifaddr * |
| 360 | ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) |
| 361 | { |
| 362 | struct in_ifaddr *ia = NULL; |
| 363 | int checkif; |
| 364 | |
| 365 | /* |
| 366 | * Enable a consistency check between the destination address |
| 367 | * and the arrival interface for a unicast packet (the RFC 1122 |
| 368 | * strong ES model) if IP forwarding is disabled and the packet |
| 369 | * is not locally generated. |
| 370 | * |
| 371 | * XXX - Checking also should be disabled if the destination |
| 372 | * address is ipnat'ed to a different interface. |
| 373 | * |
| 374 | * XXX - Checking is incompatible with IP aliases added |
| 375 | * to the loopback interface instead of the interface where |
| 376 | * the packets are received. |
| 377 | * |
| 378 | * XXX - We need to add a per ifaddr flag for this so that |
| 379 | * we get finer grain control. |
| 380 | */ |
| 381 | checkif = ip_checkinterface && (ipforwarding == 0) && |
| 382 | (ifp->if_flags & IFF_LOOPBACK) == 0; |
| 383 | |
| 384 | IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { |
| 385 | if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { |
| 386 | if (ia->ia4_flags & IN_IFF_NOTREADY) |
| 387 | continue; |
| 388 | if (checkif && ia->ia_ifp != ifp) |
| 389 | continue; |
| 390 | if ((ia->ia_ifp->if_flags & IFF_UP) != 0 && |
| 391 | (ia->ia4_flags & IN_IFF_DETACHED) == 0) |
| 392 | break; |
| 393 | else |
| 394 | (*downmatch)++; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | return ia; |
| 399 | } |
| 400 | |
| 401 | static struct in_ifaddr * |
| 402 | ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) |
| 403 | { |
| 404 | struct in_ifaddr *ia = NULL; |
| 405 | struct ifaddr *ifa; |
| 406 | |
| 407 | IFADDR_READER_FOREACH(ifa, ifp) { |
| 408 | if (ifa->ifa_addr->sa_family != AF_INET) |
| 409 | continue; |
| 410 | ia = ifatoia(ifa); |
| 411 | if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) |
| 412 | continue; |
| 413 | if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
| 414 | in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
| 415 | /* |
| 416 | * Look for all-0's host part (old broadcast addr), |
| 417 | * either for subnet or net. |
| 418 | */ |
| 419 | ip->ip_dst.s_addr == ia->ia_subnet || |
| 420 | ip->ip_dst.s_addr == ia->ia_net) |
| 421 | goto matched; |
| 422 | /* |
| 423 | * An interface with IP address zero accepts |
| 424 | * all packets that arrive on that interface. |
| 425 | */ |
| 426 | if (in_nullhost(ia->ia_addr.sin_addr)) |
| 427 | goto matched; |
| 428 | } |
| 429 | ia = NULL; |
| 430 | |
| 431 | matched: |
| 432 | return ia; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * IP software interrupt routine. |
| 437 | */ |
| 438 | static void |
| 439 | ipintr(void *arg __unused) |
| 440 | { |
| 441 | struct mbuf *m; |
| 442 | |
| 443 | KASSERT(cpu_softintr_p()); |
| 444 | |
| 445 | #ifndef NET_MPSAFE |
| 446 | mutex_enter(softnet_lock); |
| 447 | #endif |
| 448 | while ((m = pktq_dequeue(ip_pktq)) != NULL) { |
| 449 | ip_input(m); |
| 450 | } |
| 451 | #ifndef NET_MPSAFE |
| 452 | mutex_exit(softnet_lock); |
| 453 | #endif |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * IP input routine. Checksum and byte swap header. If fragmented |
| 458 | * try to reassemble. Process options. Pass to next level. |
| 459 | */ |
| 460 | static void |
| 461 | ip_input(struct mbuf *m) |
| 462 | { |
| 463 | struct ip *ip = NULL; |
| 464 | struct in_ifaddr *ia = NULL; |
| 465 | int hlen = 0, len; |
| 466 | int downmatch; |
| 467 | int srcrt = 0; |
| 468 | ifnet_t *ifp; |
| 469 | struct psref psref; |
| 470 | int s; |
| 471 | |
| 472 | KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " |
| 473 | "interrupt handler; synchronization assumptions violated" ); |
| 474 | |
| 475 | MCLAIM(m, &ip_rx_mowner); |
| 476 | KASSERT((m->m_flags & M_PKTHDR) != 0); |
| 477 | |
| 478 | ifp = m_get_rcvif_psref(m, &psref); |
| 479 | if (__predict_false(ifp == NULL)) |
| 480 | goto out; |
| 481 | |
| 482 | /* |
| 483 | * If no IP addresses have been set yet but the interfaces |
| 484 | * are receiving, can't do anything with incoming packets yet. |
| 485 | * Note: we pre-check without locks held. |
| 486 | */ |
| 487 | if (IN_ADDRLIST_READER_EMPTY()) |
| 488 | goto out; |
| 489 | IP_STATINC(IP_STAT_TOTAL); |
| 490 | |
| 491 | /* |
| 492 | * If the IP header is not aligned, slurp it up into a new |
| 493 | * mbuf with space for link headers, in the event we forward |
| 494 | * it. Otherwise, if it is aligned, make sure the entire |
| 495 | * base IP header is in the first mbuf of the chain. |
| 496 | */ |
| 497 | if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { |
| 498 | if ((m = m_copyup(m, sizeof(struct ip), |
| 499 | (max_linkhdr + 3) & ~3)) == NULL) { |
| 500 | /* XXXJRT new stat, please */ |
| 501 | IP_STATINC(IP_STAT_TOOSMALL); |
| 502 | goto out; |
| 503 | } |
| 504 | } else if (__predict_false(m->m_len < sizeof (struct ip))) { |
| 505 | if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { |
| 506 | IP_STATINC(IP_STAT_TOOSMALL); |
| 507 | goto out; |
| 508 | } |
| 509 | } |
| 510 | ip = mtod(m, struct ip *); |
| 511 | if (ip->ip_v != IPVERSION) { |
| 512 | IP_STATINC(IP_STAT_BADVERS); |
| 513 | goto out; |
| 514 | } |
| 515 | hlen = ip->ip_hl << 2; |
| 516 | if (hlen < sizeof(struct ip)) { /* minimum header length */ |
| 517 | IP_STATINC(IP_STAT_BADHLEN); |
| 518 | goto out; |
| 519 | } |
| 520 | if (hlen > m->m_len) { |
| 521 | if ((m = m_pullup(m, hlen)) == NULL) { |
| 522 | IP_STATINC(IP_STAT_BADHLEN); |
| 523 | goto out; |
| 524 | } |
| 525 | ip = mtod(m, struct ip *); |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * RFC1122: packets with a multicast source address are |
| 530 | * not allowed. |
| 531 | */ |
| 532 | if (IN_MULTICAST(ip->ip_src.s_addr)) { |
| 533 | IP_STATINC(IP_STAT_BADADDR); |
| 534 | goto out; |
| 535 | } |
| 536 | |
| 537 | /* 127/8 must not appear on wire - RFC1122 */ |
| 538 | if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || |
| 539 | (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { |
| 540 | if ((ifp->if_flags & IFF_LOOPBACK) == 0) { |
| 541 | IP_STATINC(IP_STAT_BADADDR); |
| 542 | goto out; |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | switch (m->m_pkthdr.csum_flags & |
| 547 | ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | |
| 548 | M_CSUM_IPv4_BAD)) { |
| 549 | case M_CSUM_IPv4|M_CSUM_IPv4_BAD: |
| 550 | INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); |
| 551 | IP_STATINC(IP_STAT_BADSUM); |
| 552 | goto out; |
| 553 | |
| 554 | case M_CSUM_IPv4: |
| 555 | /* Checksum was okay. */ |
| 556 | INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); |
| 557 | break; |
| 558 | |
| 559 | default: |
| 560 | /* |
| 561 | * Must compute it ourselves. Maybe skip checksum on |
| 562 | * loopback interfaces. |
| 563 | */ |
| 564 | if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || |
| 565 | ip_do_loopback_cksum)) { |
| 566 | INET_CSUM_COUNTER_INCR(&ip_swcsum); |
| 567 | if (in_cksum(m, hlen) != 0) { |
| 568 | IP_STATINC(IP_STAT_BADSUM); |
| 569 | goto out; |
| 570 | } |
| 571 | } |
| 572 | break; |
| 573 | } |
| 574 | |
| 575 | /* Retrieve the packet length. */ |
| 576 | len = ntohs(ip->ip_len); |
| 577 | |
| 578 | /* |
| 579 | * Check for additional length bogosity |
| 580 | */ |
| 581 | if (len < hlen) { |
| 582 | IP_STATINC(IP_STAT_BADLEN); |
| 583 | goto out; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Check that the amount of data in the buffers |
| 588 | * is as at least much as the IP header would have us expect. |
| 589 | * Trim mbufs if longer than we expect. |
| 590 | * Drop packet if shorter than we expect. |
| 591 | */ |
| 592 | if (m->m_pkthdr.len < len) { |
| 593 | IP_STATINC(IP_STAT_TOOSHORT); |
| 594 | goto out; |
| 595 | } |
| 596 | if (m->m_pkthdr.len > len) { |
| 597 | if (m->m_len == m->m_pkthdr.len) { |
| 598 | m->m_len = len; |
| 599 | m->m_pkthdr.len = len; |
| 600 | } else |
| 601 | m_adj(m, len - m->m_pkthdr.len); |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Assume that we can create a fast-forward IP flow entry |
| 606 | * based on this packet. |
| 607 | */ |
| 608 | m->m_flags |= M_CANFASTFWD; |
| 609 | |
| 610 | /* |
| 611 | * Run through list of hooks for input packets. If there are any |
| 612 | * filters which require that additional packets in the flow are |
| 613 | * not fast-forwarded, they must clear the M_CANFASTFWD flag. |
| 614 | * Note that filters must _never_ set this flag, as another filter |
| 615 | * in the list may have previously cleared it. |
| 616 | */ |
| 617 | #if defined(IPSEC) |
| 618 | if (!ipsec_used || !ipsec_indone(m)) |
| 619 | #else |
| 620 | if (1) |
| 621 | #endif |
| 622 | { |
| 623 | struct in_addr odst = ip->ip_dst; |
| 624 | bool freed; |
| 625 | |
| 626 | freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; |
| 627 | if (freed || m == NULL) { |
| 628 | m = NULL; |
| 629 | goto out; |
| 630 | } |
| 631 | ip = mtod(m, struct ip *); |
| 632 | hlen = ip->ip_hl << 2; |
| 633 | |
| 634 | /* |
| 635 | * XXX The setting of "srcrt" here is to prevent ip_forward() |
| 636 | * from generating ICMP redirects for packets that have |
| 637 | * been redirected by a hook back out on to the same LAN that |
| 638 | * they came from and is not an indication that the packet |
| 639 | * is being inffluenced by source routing options. This |
| 640 | * allows things like |
| 641 | * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" |
| 642 | * where tlp0 is both on the 1.1.1.0/24 network and is the |
| 643 | * default route for hosts on 1.1.1.0/24. Of course this |
| 644 | * also requires a "map tlp0 ..." to complete the story. |
| 645 | * One might argue whether or not this kind of network config. |
| 646 | * should be supported in this manner... |
| 647 | */ |
| 648 | srcrt = (odst.s_addr != ip->ip_dst.s_addr); |
| 649 | } |
| 650 | |
| 651 | #ifdef ALTQ |
| 652 | /* XXX Temporary until ALTQ is changed to use a pfil hook */ |
| 653 | if (altq_input) { |
| 654 | SOFTNET_LOCK(); |
| 655 | if ((*altq_input)(m, AF_INET) == 0) { |
| 656 | /* Packet dropped by traffic conditioner. */ |
| 657 | SOFTNET_UNLOCK(); |
| 658 | m = NULL; |
| 659 | goto out; |
| 660 | } |
| 661 | SOFTNET_UNLOCK(); |
| 662 | } |
| 663 | #endif |
| 664 | |
| 665 | /* |
| 666 | * Process options and, if not destined for us, |
| 667 | * ship it on. ip_dooptions returns 1 when an |
| 668 | * error was detected (causing an icmp message |
| 669 | * to be sent and the original packet to be freed). |
| 670 | */ |
| 671 | ip_nhops = 0; /* for source routed packets */ |
| 672 | if (hlen > sizeof (struct ip) && ip_dooptions(m)) { |
| 673 | m = NULL; |
| 674 | goto out; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Check our list of addresses, to see if the packet is for us. |
| 679 | * |
| 680 | * Traditional 4.4BSD did not consult IFF_UP at all. |
| 681 | * The behavior here is to treat addresses on !IFF_UP interface |
| 682 | * or IN_IFF_NOTREADY addresses as not mine. |
| 683 | */ |
| 684 | downmatch = 0; |
| 685 | s = pserialize_read_enter(); |
| 686 | ia = ip_match_our_address(ifp, ip, &downmatch); |
| 687 | if (ia != NULL) { |
| 688 | pserialize_read_exit(s); |
| 689 | goto ours; |
| 690 | } |
| 691 | |
| 692 | if (ifp->if_flags & IFF_BROADCAST) { |
| 693 | ia = ip_match_our_address_broadcast(ifp, ip); |
| 694 | if (ia != NULL) { |
| 695 | pserialize_read_exit(s); |
| 696 | goto ours; |
| 697 | } |
| 698 | } |
| 699 | pserialize_read_exit(s); |
| 700 | |
| 701 | if (IN_MULTICAST(ip->ip_dst.s_addr)) { |
| 702 | #ifdef MROUTING |
| 703 | extern struct socket *ip_mrouter; |
| 704 | |
| 705 | if (ip_mrouter) { |
| 706 | /* |
| 707 | * If we are acting as a multicast router, all |
| 708 | * incoming multicast packets are passed to the |
| 709 | * kernel-level multicast forwarding function. |
| 710 | * The packet is returned (relatively) intact; if |
| 711 | * ip_mforward() returns a non-zero value, the packet |
| 712 | * must be discarded, else it may be accepted below. |
| 713 | * |
| 714 | * (The IP ident field is put in the same byte order |
| 715 | * as expected when ip_mforward() is called from |
| 716 | * ip_output().) |
| 717 | */ |
| 718 | SOFTNET_LOCK(); |
| 719 | if (ip_mforward(m, ifp) != 0) { |
| 720 | SOFTNET_UNLOCK(); |
| 721 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 722 | goto out; |
| 723 | } |
| 724 | SOFTNET_UNLOCK(); |
| 725 | |
| 726 | /* |
| 727 | * The process-level routing demon needs to receive |
| 728 | * all multicast IGMP packets, whether or not this |
| 729 | * host belongs to their destination groups. |
| 730 | */ |
| 731 | if (ip->ip_p == IPPROTO_IGMP) { |
| 732 | goto ours; |
| 733 | } |
| 734 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 735 | } |
| 736 | #endif |
| 737 | /* |
| 738 | * See if we belong to the destination multicast group on the |
| 739 | * arrival interface. |
| 740 | */ |
| 741 | if (!in_multi_group(ip->ip_dst, ifp, 0)) { |
| 742 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 743 | goto out; |
| 744 | } |
| 745 | goto ours; |
| 746 | } |
| 747 | if (ip->ip_dst.s_addr == INADDR_BROADCAST || |
| 748 | in_nullhost(ip->ip_dst)) |
| 749 | goto ours; |
| 750 | |
| 751 | /* |
| 752 | * Not for us; forward if possible and desirable. |
| 753 | */ |
| 754 | if (ipforwarding == 0) { |
| 755 | m_put_rcvif_psref(ifp, &psref); |
| 756 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 757 | m_freem(m); |
| 758 | } else { |
| 759 | /* |
| 760 | * If ip_dst matched any of my address on !IFF_UP interface, |
| 761 | * and there's no IFF_UP interface that matches ip_dst, |
| 762 | * send icmp unreach. Forwarding it will result in in-kernel |
| 763 | * forwarding loop till TTL goes to 0. |
| 764 | */ |
| 765 | if (downmatch) { |
| 766 | m_put_rcvif_psref(ifp, &psref); |
| 767 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); |
| 768 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 769 | return; |
| 770 | } |
| 771 | #ifdef IPSEC |
| 772 | /* Perform IPsec, if any. */ |
| 773 | if (ipsec_used) { |
| 774 | SOFTNET_LOCK(); |
| 775 | if (ipsec4_input(m, IP_FORWARDING | |
| 776 | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) { |
| 777 | SOFTNET_UNLOCK(); |
| 778 | goto out; |
| 779 | } |
| 780 | SOFTNET_UNLOCK(); |
| 781 | } |
| 782 | #endif |
| 783 | ip_forward(m, srcrt, ifp); |
| 784 | m_put_rcvif_psref(ifp, &psref); |
| 785 | } |
| 786 | return; |
| 787 | |
| 788 | ours: |
| 789 | m_put_rcvif_psref(ifp, &psref); |
| 790 | ifp = NULL; |
| 791 | |
| 792 | /* |
| 793 | * If offset or IP_MF are set, must reassemble. |
| 794 | */ |
| 795 | if (ip->ip_off & ~htons(IP_DF|IP_RF)) { |
| 796 | /* |
| 797 | * Pass to IP reassembly mechanism. |
| 798 | */ |
| 799 | if (ip_reass_packet(&m, ip) != 0) { |
| 800 | /* Failed; invalid fragment(s) or packet. */ |
| 801 | goto out; |
| 802 | } |
| 803 | if (m == NULL) { |
| 804 | /* More fragments should come; silently return. */ |
| 805 | goto out; |
| 806 | } |
| 807 | /* |
| 808 | * Reassembly is done, we have the final packet. |
| 809 | * Updated cached data in local variable(s). |
| 810 | */ |
| 811 | ip = mtod(m, struct ip *); |
| 812 | hlen = ip->ip_hl << 2; |
| 813 | } |
| 814 | |
| 815 | #ifdef IPSEC |
| 816 | /* |
| 817 | * Enforce IPsec policy checking if we are seeing last header. |
| 818 | * Note that we do not visit this with protocols with PCB layer |
| 819 | * code - like UDP/TCP/raw IP. |
| 820 | */ |
| 821 | if (ipsec_used && |
| 822 | (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { |
| 823 | SOFTNET_LOCK(); |
| 824 | if (ipsec4_input(m, 0) != 0) { |
| 825 | SOFTNET_UNLOCK(); |
| 826 | goto out; |
| 827 | } |
| 828 | SOFTNET_UNLOCK(); |
| 829 | } |
| 830 | #endif |
| 831 | |
| 832 | /* |
| 833 | * Switch out to protocol's input routine. |
| 834 | */ |
| 835 | #if IFA_STATS |
| 836 | if (ia && ip) { |
| 837 | struct in_ifaddr *_ia; |
| 838 | /* |
| 839 | * Keep a reference from ip_match_our_address with psref |
| 840 | * is expensive, so explore ia here again. |
| 841 | */ |
| 842 | s = pserialize_read_enter(); |
| 843 | _ia = in_get_ia(ip->ip_dst); |
| 844 | _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); |
| 845 | pserialize_read_exit(s); |
| 846 | } |
| 847 | #endif |
| 848 | IP_STATINC(IP_STAT_DELIVERED); |
| 849 | |
| 850 | const int off = hlen, nh = ip->ip_p; |
| 851 | |
| 852 | SOFTNET_LOCK(); |
| 853 | (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); |
| 854 | SOFTNET_UNLOCK(); |
| 855 | return; |
| 856 | |
| 857 | out: |
| 858 | m_put_rcvif_psref(ifp, &psref); |
| 859 | if (m != NULL) |
| 860 | m_freem(m); |
| 861 | } |
| 862 | |
| 863 | /* |
| 864 | * IP timer processing. |
| 865 | */ |
| 866 | void |
| 867 | ip_slowtimo(void) |
| 868 | { |
| 869 | |
| 870 | mutex_enter(softnet_lock); |
| 871 | KERNEL_LOCK(1, NULL); |
| 872 | |
| 873 | ip_reass_slowtimo(); |
| 874 | |
| 875 | KERNEL_UNLOCK_ONE(NULL); |
| 876 | mutex_exit(softnet_lock); |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * IP drain processing. |
| 881 | */ |
| 882 | void |
| 883 | ip_drain(void) |
| 884 | { |
| 885 | |
| 886 | KERNEL_LOCK(1, NULL); |
| 887 | ip_reass_drain(); |
| 888 | KERNEL_UNLOCK_ONE(NULL); |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * ip_dooptions: perform option processing on a datagram, possibly discarding |
| 893 | * it if bad options are encountered, or forwarding it if source-routed. |
| 894 | * |
| 895 | * => Returns true if packet has been forwarded/freed. |
| 896 | * => Returns false if the packet should be processed further. |
| 897 | */ |
| 898 | static bool |
| 899 | ip_dooptions(struct mbuf *m) |
| 900 | { |
| 901 | struct ip *ip = mtod(m, struct ip *); |
| 902 | u_char *cp, *cp0; |
| 903 | struct ip_timestamp *ipt; |
| 904 | struct in_ifaddr *ia; |
| 905 | int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; |
| 906 | struct in_addr dst; |
| 907 | n_time ntime; |
| 908 | struct ifaddr *ifa; |
| 909 | int s; |
| 910 | |
| 911 | dst = ip->ip_dst; |
| 912 | cp = (u_char *)(ip + 1); |
| 913 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
| 914 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
| 915 | opt = cp[IPOPT_OPTVAL]; |
| 916 | if (opt == IPOPT_EOL) |
| 917 | break; |
| 918 | if (opt == IPOPT_NOP) |
| 919 | optlen = 1; |
| 920 | else { |
| 921 | if (cnt < IPOPT_OLEN + sizeof(*cp)) { |
| 922 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
| 923 | goto bad; |
| 924 | } |
| 925 | optlen = cp[IPOPT_OLEN]; |
| 926 | if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { |
| 927 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
| 928 | goto bad; |
| 929 | } |
| 930 | } |
| 931 | switch (opt) { |
| 932 | |
| 933 | default: |
| 934 | break; |
| 935 | |
| 936 | /* |
| 937 | * Source routing with record. |
| 938 | * Find interface with current destination address. |
| 939 | * If none on this machine then drop if strictly routed, |
| 940 | * or do nothing if loosely routed. |
| 941 | * Record interface address and bring up next address |
| 942 | * component. If strictly routed make sure next |
| 943 | * address is on directly accessible net. |
| 944 | */ |
| 945 | case IPOPT_LSRR: |
| 946 | case IPOPT_SSRR: |
| 947 | if (ip_allowsrcrt == 0) { |
| 948 | type = ICMP_UNREACH; |
| 949 | code = ICMP_UNREACH_NET_PROHIB; |
| 950 | goto bad; |
| 951 | } |
| 952 | if (optlen < IPOPT_OFFSET + sizeof(*cp)) { |
| 953 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
| 954 | goto bad; |
| 955 | } |
| 956 | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { |
| 957 | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
| 958 | goto bad; |
| 959 | } |
| 960 | ipaddr.sin_addr = ip->ip_dst; |
| 961 | |
| 962 | s = pserialize_read_enter(); |
| 963 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
| 964 | if (ifa == NULL) { |
| 965 | pserialize_read_exit(s); |
| 966 | if (opt == IPOPT_SSRR) { |
| 967 | type = ICMP_UNREACH; |
| 968 | code = ICMP_UNREACH_SRCFAIL; |
| 969 | goto bad; |
| 970 | } |
| 971 | /* |
| 972 | * Loose routing, and not at next destination |
| 973 | * yet; nothing to do except forward. |
| 974 | */ |
| 975 | break; |
| 976 | } |
| 977 | pserialize_read_exit(s); |
| 978 | |
| 979 | off--; /* 0 origin */ |
| 980 | if ((off + sizeof(struct in_addr)) > optlen) { |
| 981 | /* |
| 982 | * End of source route. Should be for us. |
| 983 | */ |
| 984 | save_rte(cp, ip->ip_src); |
| 985 | break; |
| 986 | } |
| 987 | /* |
| 988 | * locate outgoing interface |
| 989 | */ |
| 990 | memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), |
| 991 | sizeof(ipaddr.sin_addr)); |
| 992 | s = pserialize_read_enter(); |
| 993 | if (opt == IPOPT_SSRR) { |
| 994 | ifa = ifa_ifwithladdr(sintosa(&ipaddr)); |
| 995 | if (ifa != NULL) |
| 996 | ia = ifatoia(ifa); |
| 997 | else |
| 998 | ia = NULL; |
| 999 | } else { |
| 1000 | ia = ip_rtaddr(ipaddr.sin_addr); |
| 1001 | } |
| 1002 | if (ia == NULL) { |
| 1003 | type = ICMP_UNREACH; |
| 1004 | code = ICMP_UNREACH_SRCFAIL; |
| 1005 | pserialize_read_exit(s); |
| 1006 | goto bad; |
| 1007 | } |
| 1008 | ip->ip_dst = ipaddr.sin_addr; |
| 1009 | bcopy((void *)&ia->ia_addr.sin_addr, |
| 1010 | (void *)(cp + off), sizeof(struct in_addr)); |
| 1011 | pserialize_read_exit(s); |
| 1012 | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
| 1013 | /* |
| 1014 | * Let ip_intr's mcast routing check handle mcast pkts |
| 1015 | */ |
| 1016 | forward = !IN_MULTICAST(ip->ip_dst.s_addr); |
| 1017 | break; |
| 1018 | |
| 1019 | case IPOPT_RR: |
| 1020 | if (optlen < IPOPT_OFFSET + sizeof(*cp)) { |
| 1021 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
| 1022 | goto bad; |
| 1023 | } |
| 1024 | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { |
| 1025 | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
| 1026 | goto bad; |
| 1027 | } |
| 1028 | /* |
| 1029 | * If no space remains, ignore. |
| 1030 | */ |
| 1031 | off--; /* 0 origin */ |
| 1032 | if ((off + sizeof(struct in_addr)) > optlen) |
| 1033 | break; |
| 1034 | memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), |
| 1035 | sizeof(ipaddr.sin_addr)); |
| 1036 | /* |
| 1037 | * locate outgoing interface; if we're the destination, |
| 1038 | * use the incoming interface (should be same). |
| 1039 | */ |
| 1040 | s = pserialize_read_enter(); |
| 1041 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
| 1042 | if (ifa == NULL) { |
| 1043 | ia = ip_rtaddr(ipaddr.sin_addr); |
| 1044 | if (ia == NULL) { |
| 1045 | pserialize_read_exit(s); |
| 1046 | type = ICMP_UNREACH; |
| 1047 | code = ICMP_UNREACH_HOST; |
| 1048 | goto bad; |
| 1049 | } |
| 1050 | } else { |
| 1051 | ia = ifatoia(ifa); |
| 1052 | } |
| 1053 | bcopy((void *)&ia->ia_addr.sin_addr, |
| 1054 | (void *)(cp + off), sizeof(struct in_addr)); |
| 1055 | pserialize_read_exit(s); |
| 1056 | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
| 1057 | break; |
| 1058 | |
| 1059 | case IPOPT_TS: |
| 1060 | code = cp - (u_char *)ip; |
| 1061 | ipt = (struct ip_timestamp *)cp; |
| 1062 | if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { |
| 1063 | code = (u_char *)&ipt->ipt_len - (u_char *)ip; |
| 1064 | goto bad; |
| 1065 | } |
| 1066 | if (ipt->ipt_ptr < 5) { |
| 1067 | code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; |
| 1068 | goto bad; |
| 1069 | } |
| 1070 | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
| 1071 | if (++ipt->ipt_oflw == 0) { |
| 1072 | code = (u_char *)&ipt->ipt_ptr - |
| 1073 | (u_char *)ip; |
| 1074 | goto bad; |
| 1075 | } |
| 1076 | break; |
| 1077 | } |
| 1078 | cp0 = (cp + ipt->ipt_ptr - 1); |
| 1079 | switch (ipt->ipt_flg) { |
| 1080 | |
| 1081 | case IPOPT_TS_TSONLY: |
| 1082 | break; |
| 1083 | |
| 1084 | case IPOPT_TS_TSANDADDR: { |
| 1085 | struct ifnet *rcvif; |
| 1086 | int _s, _ss; |
| 1087 | |
| 1088 | if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
| 1089 | sizeof(struct in_addr) > ipt->ipt_len) { |
| 1090 | code = (u_char *)&ipt->ipt_ptr - |
| 1091 | (u_char *)ip; |
| 1092 | goto bad; |
| 1093 | } |
| 1094 | ipaddr.sin_addr = dst; |
| 1095 | _ss = pserialize_read_enter(); |
| 1096 | rcvif = m_get_rcvif(m, &_s); |
| 1097 | ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif); |
| 1098 | m_put_rcvif(rcvif, &_s); |
| 1099 | if (ifa == NULL) { |
| 1100 | pserialize_read_exit(_ss); |
| 1101 | break; |
| 1102 | } |
| 1103 | ia = ifatoia(ifa); |
| 1104 | bcopy(&ia->ia_addr.sin_addr, |
| 1105 | cp0, sizeof(struct in_addr)); |
| 1106 | pserialize_read_exit(_ss); |
| 1107 | ipt->ipt_ptr += sizeof(struct in_addr); |
| 1108 | break; |
| 1109 | } |
| 1110 | |
| 1111 | case IPOPT_TS_PRESPEC: |
| 1112 | if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
| 1113 | sizeof(struct in_addr) > ipt->ipt_len) { |
| 1114 | code = (u_char *)&ipt->ipt_ptr - |
| 1115 | (u_char *)ip; |
| 1116 | goto bad; |
| 1117 | } |
| 1118 | memcpy(&ipaddr.sin_addr, cp0, |
| 1119 | sizeof(struct in_addr)); |
| 1120 | s = pserialize_read_enter(); |
| 1121 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
| 1122 | if (ifa == NULL) { |
| 1123 | pserialize_read_exit(s); |
| 1124 | continue; |
| 1125 | } |
| 1126 | pserialize_read_exit(s); |
| 1127 | ipt->ipt_ptr += sizeof(struct in_addr); |
| 1128 | break; |
| 1129 | |
| 1130 | default: |
| 1131 | /* XXX can't take &ipt->ipt_flg */ |
| 1132 | code = (u_char *)&ipt->ipt_ptr - |
| 1133 | (u_char *)ip + 1; |
| 1134 | goto bad; |
| 1135 | } |
| 1136 | ntime = iptime(); |
| 1137 | cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ |
| 1138 | memmove((char *)cp + ipt->ipt_ptr - 1, cp0, |
| 1139 | sizeof(n_time)); |
| 1140 | ipt->ipt_ptr += sizeof(n_time); |
| 1141 | } |
| 1142 | } |
| 1143 | if (forward) { |
| 1144 | struct ifnet *rcvif; |
| 1145 | struct psref _psref; |
| 1146 | |
| 1147 | if (ip_forwsrcrt == 0) { |
| 1148 | type = ICMP_UNREACH; |
| 1149 | code = ICMP_UNREACH_SRCFAIL; |
| 1150 | goto bad; |
| 1151 | } |
| 1152 | |
| 1153 | rcvif = m_get_rcvif_psref(m, &_psref); |
| 1154 | if (__predict_false(rcvif == NULL)) { |
| 1155 | type = ICMP_UNREACH; |
| 1156 | code = ICMP_UNREACH_HOST; |
| 1157 | goto bad; |
| 1158 | } |
| 1159 | ip_forward(m, 1, rcvif); |
| 1160 | m_put_rcvif_psref(rcvif, &_psref); |
| 1161 | return true; |
| 1162 | } |
| 1163 | return false; |
| 1164 | bad: |
| 1165 | icmp_error(m, type, code, 0, 0); |
| 1166 | IP_STATINC(IP_STAT_BADOPTIONS); |
| 1167 | return true; |
| 1168 | } |
| 1169 | |
| 1170 | /* |
| 1171 | * ip_rtaddr: given address of next destination (final or next hop), |
| 1172 | * return internet address info of interface to be used to get there. |
| 1173 | */ |
| 1174 | static struct in_ifaddr * |
| 1175 | ip_rtaddr(struct in_addr dst) |
| 1176 | { |
| 1177 | struct rtentry *rt; |
| 1178 | union { |
| 1179 | struct sockaddr dst; |
| 1180 | struct sockaddr_in dst4; |
| 1181 | } u; |
| 1182 | struct route *ro; |
| 1183 | |
| 1184 | sockaddr_in_init(&u.dst4, &dst, 0); |
| 1185 | |
| 1186 | SOFTNET_LOCK(); |
| 1187 | ro = percpu_getref(ipforward_rt_percpu); |
| 1188 | rt = rtcache_lookup(ro, &u.dst); |
| 1189 | percpu_putref(ipforward_rt_percpu); |
| 1190 | SOFTNET_UNLOCK(); |
| 1191 | if (rt == NULL) |
| 1192 | return NULL; |
| 1193 | |
| 1194 | return ifatoia(rt->rt_ifa); |
| 1195 | } |
| 1196 | |
| 1197 | /* |
| 1198 | * save_rte: save incoming source route for use in replies, to be picked |
| 1199 | * up later by ip_srcroute if the receiver is interested. |
| 1200 | */ |
| 1201 | static void |
| 1202 | save_rte(u_char *option, struct in_addr dst) |
| 1203 | { |
| 1204 | unsigned olen; |
| 1205 | |
| 1206 | olen = option[IPOPT_OLEN]; |
| 1207 | if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) |
| 1208 | return; |
| 1209 | memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); |
| 1210 | ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); |
| 1211 | ip_srcrt.dst = dst; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Retrieve incoming source route for use in replies, |
| 1216 | * in the same form used by setsockopt. |
| 1217 | * The first hop is placed before the options, will be removed later. |
| 1218 | */ |
| 1219 | struct mbuf * |
| 1220 | ip_srcroute(void) |
| 1221 | { |
| 1222 | struct in_addr *p, *q; |
| 1223 | struct mbuf *m; |
| 1224 | |
| 1225 | if (ip_nhops == 0) |
| 1226 | return NULL; |
| 1227 | m = m_get(M_DONTWAIT, MT_SOOPTS); |
| 1228 | if (m == 0) |
| 1229 | return NULL; |
| 1230 | |
| 1231 | MCLAIM(m, &inetdomain.dom_mowner); |
| 1232 | #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) |
| 1233 | |
| 1234 | /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ |
| 1235 | m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + |
| 1236 | OPTSIZ; |
| 1237 | |
| 1238 | /* |
| 1239 | * First save first hop for return route |
| 1240 | */ |
| 1241 | p = &ip_srcrt.route[ip_nhops - 1]; |
| 1242 | *(mtod(m, struct in_addr *)) = *p--; |
| 1243 | |
| 1244 | /* |
| 1245 | * Copy option fields and padding (nop) to mbuf. |
| 1246 | */ |
| 1247 | ip_srcrt.nop = IPOPT_NOP; |
| 1248 | ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; |
| 1249 | memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, |
| 1250 | OPTSIZ); |
| 1251 | q = (struct in_addr *)(mtod(m, char *) + |
| 1252 | sizeof(struct in_addr) + OPTSIZ); |
| 1253 | #undef OPTSIZ |
| 1254 | /* |
| 1255 | * Record return path as an IP source route, |
| 1256 | * reversing the path (pointers are now aligned). |
| 1257 | */ |
| 1258 | while (p >= ip_srcrt.route) { |
| 1259 | *q++ = *p--; |
| 1260 | } |
| 1261 | /* |
| 1262 | * Last hop goes to final destination. |
| 1263 | */ |
| 1264 | *q = ip_srcrt.dst; |
| 1265 | return (m); |
| 1266 | } |
| 1267 | |
| 1268 | const int inetctlerrmap[PRC_NCMDS] = { |
| 1269 | [PRC_MSGSIZE] = EMSGSIZE, |
| 1270 | [PRC_HOSTDEAD] = EHOSTDOWN, |
| 1271 | [PRC_HOSTUNREACH] = EHOSTUNREACH, |
| 1272 | [PRC_UNREACH_NET] = EHOSTUNREACH, |
| 1273 | [PRC_UNREACH_HOST] = EHOSTUNREACH, |
| 1274 | [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, |
| 1275 | [PRC_UNREACH_PORT] = ECONNREFUSED, |
| 1276 | [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, |
| 1277 | [PRC_PARAMPROB] = ENOPROTOOPT, |
| 1278 | }; |
| 1279 | |
| 1280 | void |
| 1281 | ip_fasttimo(void) |
| 1282 | { |
| 1283 | if (ip_drainwanted) { |
| 1284 | ip_drain(); |
| 1285 | ip_drainwanted = 0; |
| 1286 | } |
| 1287 | } |
| 1288 | |
| 1289 | void |
| 1290 | ip_drainstub(void) |
| 1291 | { |
| 1292 | ip_drainwanted = 1; |
| 1293 | } |
| 1294 | |
| 1295 | /* |
| 1296 | * Forward a packet. If some error occurs return the sender |
| 1297 | * an icmp packet. Note we can't always generate a meaningful |
| 1298 | * icmp message because icmp doesn't have a large enough repertoire |
| 1299 | * of codes and types. |
| 1300 | * |
| 1301 | * If not forwarding, just drop the packet. This could be confusing |
| 1302 | * if ipforwarding was zero but some routing protocol was advancing |
| 1303 | * us as a gateway to somewhere. However, we must let the routing |
| 1304 | * protocol deal with that. |
| 1305 | * |
| 1306 | * The srcrt parameter indicates whether the packet is being forwarded |
| 1307 | * via a source route. |
| 1308 | */ |
| 1309 | static void |
| 1310 | ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) |
| 1311 | { |
| 1312 | struct ip *ip = mtod(m, struct ip *); |
| 1313 | struct rtentry *rt; |
| 1314 | int error, type = 0, code = 0, destmtu = 0; |
| 1315 | struct mbuf *mcopy; |
| 1316 | n_long dest; |
| 1317 | union { |
| 1318 | struct sockaddr dst; |
| 1319 | struct sockaddr_in dst4; |
| 1320 | } u; |
| 1321 | uint64_t *ips; |
| 1322 | struct route *ro; |
| 1323 | |
| 1324 | KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " |
| 1325 | "interrupt handler; synchronization assumptions violated" ); |
| 1326 | |
| 1327 | /* |
| 1328 | * We are now in the output path. |
| 1329 | */ |
| 1330 | MCLAIM(m, &ip_tx_mowner); |
| 1331 | |
| 1332 | /* |
| 1333 | * Clear any in-bound checksum flags for this packet. |
| 1334 | */ |
| 1335 | m->m_pkthdr.csum_flags = 0; |
| 1336 | |
| 1337 | dest = 0; |
| 1338 | if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { |
| 1339 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 1340 | m_freem(m); |
| 1341 | return; |
| 1342 | } |
| 1343 | |
| 1344 | if (ip->ip_ttl <= IPTTLDEC) { |
| 1345 | icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); |
| 1346 | return; |
| 1347 | } |
| 1348 | |
| 1349 | sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); |
| 1350 | |
| 1351 | ro = percpu_getref(ipforward_rt_percpu); |
| 1352 | if ((rt = rtcache_lookup(ro, &u.dst)) == NULL) { |
| 1353 | percpu_putref(ipforward_rt_percpu); |
| 1354 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); |
| 1355 | return; |
| 1356 | } |
| 1357 | |
| 1358 | /* |
| 1359 | * Save at most 68 bytes of the packet in case |
| 1360 | * we need to generate an ICMP message to the src. |
| 1361 | * Pullup to avoid sharing mbuf cluster between m and mcopy. |
| 1362 | */ |
| 1363 | mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); |
| 1364 | if (mcopy) |
| 1365 | mcopy = m_pullup(mcopy, ip->ip_hl << 2); |
| 1366 | |
| 1367 | ip->ip_ttl -= IPTTLDEC; |
| 1368 | |
| 1369 | /* |
| 1370 | * If forwarding packet using same interface that it came in on, |
| 1371 | * perhaps should send a redirect to sender to shortcut a hop. |
| 1372 | * Only send redirect if source is sending directly to us, |
| 1373 | * and if packet was not source routed (or has any options). |
| 1374 | * Also, don't send redirect if forwarding using a default route |
| 1375 | * or a route modified by a redirect. |
| 1376 | */ |
| 1377 | if (rt->rt_ifp == rcvif && |
| 1378 | (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
| 1379 | !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && |
| 1380 | ipsendredirects && !srcrt) { |
| 1381 | if (rt->rt_ifa && |
| 1382 | (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
| 1383 | ifatoia(rt->rt_ifa)->ia_subnet) { |
| 1384 | if (rt->rt_flags & RTF_GATEWAY) |
| 1385 | dest = satosin(rt->rt_gateway)->sin_addr.s_addr; |
| 1386 | else |
| 1387 | dest = ip->ip_dst.s_addr; |
| 1388 | /* |
| 1389 | * Router requirements says to only send host |
| 1390 | * redirects. |
| 1391 | */ |
| 1392 | type = ICMP_REDIRECT; |
| 1393 | code = ICMP_REDIRECT_HOST; |
| 1394 | } |
| 1395 | } |
| 1396 | |
| 1397 | error = ip_output(m, NULL, ro, |
| 1398 | (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), |
| 1399 | NULL, NULL); |
| 1400 | |
| 1401 | if (error) { |
| 1402 | IP_STATINC(IP_STAT_CANTFORWARD); |
| 1403 | goto error; |
| 1404 | } |
| 1405 | |
| 1406 | ips = IP_STAT_GETREF(); |
| 1407 | ips[IP_STAT_FORWARD]++; |
| 1408 | |
| 1409 | if (type) { |
| 1410 | ips[IP_STAT_REDIRECTSENT]++; |
| 1411 | IP_STAT_PUTREF(); |
| 1412 | goto redirect; |
| 1413 | } |
| 1414 | |
| 1415 | IP_STAT_PUTREF(); |
| 1416 | if (mcopy) { |
| 1417 | #ifdef GATEWAY |
| 1418 | if (mcopy->m_flags & M_CANFASTFWD) |
| 1419 | ipflow_create(ro, mcopy); |
| 1420 | #endif |
| 1421 | m_freem(mcopy); |
| 1422 | } |
| 1423 | |
| 1424 | percpu_putref(ipforward_rt_percpu); |
| 1425 | return; |
| 1426 | |
| 1427 | redirect: |
| 1428 | error: |
| 1429 | if (mcopy == NULL) { |
| 1430 | percpu_putref(ipforward_rt_percpu); |
| 1431 | return; |
| 1432 | } |
| 1433 | |
| 1434 | switch (error) { |
| 1435 | |
| 1436 | case 0: /* forwarded, but need redirect */ |
| 1437 | /* type, code set above */ |
| 1438 | break; |
| 1439 | |
| 1440 | case ENETUNREACH: /* shouldn't happen, checked above */ |
| 1441 | case EHOSTUNREACH: |
| 1442 | case ENETDOWN: |
| 1443 | case EHOSTDOWN: |
| 1444 | default: |
| 1445 | type = ICMP_UNREACH; |
| 1446 | code = ICMP_UNREACH_HOST; |
| 1447 | break; |
| 1448 | |
| 1449 | case EMSGSIZE: |
| 1450 | type = ICMP_UNREACH; |
| 1451 | code = ICMP_UNREACH_NEEDFRAG; |
| 1452 | |
| 1453 | if ((rt = rtcache_validate(ro)) != NULL) |
| 1454 | destmtu = rt->rt_ifp->if_mtu; |
| 1455 | #ifdef IPSEC |
| 1456 | if (ipsec_used) |
| 1457 | (void)ipsec4_forward(mcopy, &destmtu); |
| 1458 | #endif |
| 1459 | IP_STATINC(IP_STAT_CANTFRAG); |
| 1460 | break; |
| 1461 | |
| 1462 | case ENOBUFS: |
| 1463 | /* |
| 1464 | * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, |
| 1465 | * Requirements for IP Version 4 Routers. Source quench can |
| 1466 | * big problem under DoS attacks or if the underlying |
| 1467 | * interface is rate-limited. |
| 1468 | */ |
| 1469 | if (mcopy) |
| 1470 | m_freem(mcopy); |
| 1471 | percpu_putref(ipforward_rt_percpu); |
| 1472 | return; |
| 1473 | } |
| 1474 | icmp_error(mcopy, type, code, dest, destmtu); |
| 1475 | percpu_putref(ipforward_rt_percpu); |
| 1476 | } |
| 1477 | |
| 1478 | void |
| 1479 | ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, |
| 1480 | struct mbuf *m) |
| 1481 | { |
| 1482 | struct socket *so = inp->inp_socket; |
| 1483 | ifnet_t *ifp; |
| 1484 | int inpflags = inp->inp_flags; |
| 1485 | struct psref psref; |
| 1486 | |
| 1487 | ifp = m_get_rcvif_psref(m, &psref); |
| 1488 | if (__predict_false(ifp == NULL)) |
| 1489 | return; /* XXX should report error? */ |
| 1490 | |
| 1491 | if (so->so_options & SO_TIMESTAMP |
| 1492 | #ifdef SO_OTIMESTAMP |
| 1493 | || so->so_options & SO_OTIMESTAMP |
| 1494 | #endif |
| 1495 | ) { |
| 1496 | struct timeval tv; |
| 1497 | |
| 1498 | microtime(&tv); |
| 1499 | #ifdef SO_OTIMESTAMP |
| 1500 | if (so->so_options & SO_OTIMESTAMP) { |
| 1501 | struct timeval50 tv50; |
| 1502 | timeval_to_timeval50(&tv, &tv50); |
| 1503 | *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), |
| 1504 | SCM_OTIMESTAMP, SOL_SOCKET); |
| 1505 | } else |
| 1506 | #endif |
| 1507 | *mp = sbcreatecontrol((void *) &tv, sizeof(tv), |
| 1508 | SCM_TIMESTAMP, SOL_SOCKET); |
| 1509 | if (*mp) |
| 1510 | mp = &(*mp)->m_next; |
| 1511 | } |
| 1512 | if (inpflags & INP_RECVDSTADDR) { |
| 1513 | *mp = sbcreatecontrol((void *) &ip->ip_dst, |
| 1514 | sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); |
| 1515 | if (*mp) |
| 1516 | mp = &(*mp)->m_next; |
| 1517 | } |
| 1518 | if (inpflags & INP_RECVPKTINFO) { |
| 1519 | struct in_pktinfo ipi; |
| 1520 | ipi.ipi_addr = ip->ip_src; |
| 1521 | ipi.ipi_ifindex = ifp->if_index; |
| 1522 | *mp = sbcreatecontrol((void *) &ipi, |
| 1523 | sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP); |
| 1524 | if (*mp) |
| 1525 | mp = &(*mp)->m_next; |
| 1526 | } |
| 1527 | if (inpflags & INP_PKTINFO) { |
| 1528 | struct in_pktinfo ipi; |
| 1529 | ipi.ipi_addr = ip->ip_dst; |
| 1530 | ipi.ipi_ifindex = ifp->if_index; |
| 1531 | *mp = sbcreatecontrol((void *) &ipi, |
| 1532 | sizeof(ipi), IP_PKTINFO, IPPROTO_IP); |
| 1533 | if (*mp) |
| 1534 | mp = &(*mp)->m_next; |
| 1535 | } |
| 1536 | if (inpflags & INP_RECVIF) { |
| 1537 | struct sockaddr_dl sdl; |
| 1538 | |
| 1539 | sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, |
| 1540 | NULL, 0); |
| 1541 | *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); |
| 1542 | if (*mp) |
| 1543 | mp = &(*mp)->m_next; |
| 1544 | } |
| 1545 | if (inpflags & INP_RECVTTL) { |
| 1546 | *mp = sbcreatecontrol((void *) &ip->ip_ttl, |
| 1547 | sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); |
| 1548 | if (*mp) |
| 1549 | mp = &(*mp)->m_next; |
| 1550 | } |
| 1551 | m_put_rcvif_psref(ifp, &psref); |
| 1552 | } |
| 1553 | |
| 1554 | /* |
| 1555 | * sysctl helper routine for net.inet.ip.forwsrcrt. |
| 1556 | */ |
| 1557 | static int |
| 1558 | sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) |
| 1559 | { |
| 1560 | int error, tmp; |
| 1561 | struct sysctlnode node; |
| 1562 | |
| 1563 | node = *rnode; |
| 1564 | tmp = ip_forwsrcrt; |
| 1565 | node.sysctl_data = &tmp; |
| 1566 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 1567 | if (error || newp == NULL) |
| 1568 | return (error); |
| 1569 | |
| 1570 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, |
| 1571 | 0, NULL, NULL, NULL); |
| 1572 | if (error) |
| 1573 | return (error); |
| 1574 | |
| 1575 | ip_forwsrcrt = tmp; |
| 1576 | |
| 1577 | return (0); |
| 1578 | } |
| 1579 | |
| 1580 | /* |
| 1581 | * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the |
| 1582 | * range of the new value and tweaks timers if it changes. |
| 1583 | */ |
| 1584 | static int |
| 1585 | sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) |
| 1586 | { |
| 1587 | int error, tmp; |
| 1588 | struct sysctlnode node; |
| 1589 | |
| 1590 | node = *rnode; |
| 1591 | tmp = ip_mtudisc_timeout; |
| 1592 | node.sysctl_data = &tmp; |
| 1593 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
| 1594 | if (error || newp == NULL) |
| 1595 | return (error); |
| 1596 | if (tmp < 0) |
| 1597 | return (EINVAL); |
| 1598 | |
| 1599 | mutex_enter(softnet_lock); |
| 1600 | |
| 1601 | ip_mtudisc_timeout = tmp; |
| 1602 | rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); |
| 1603 | |
| 1604 | mutex_exit(softnet_lock); |
| 1605 | |
| 1606 | return (0); |
| 1607 | } |
| 1608 | |
| 1609 | static int |
| 1610 | sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) |
| 1611 | { |
| 1612 | |
| 1613 | return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); |
| 1614 | } |
| 1615 | |
| 1616 | static void |
| 1617 | sysctl_net_inet_ip_setup(struct sysctllog **clog) |
| 1618 | { |
| 1619 | sysctl_createv(clog, 0, NULL, NULL, |
| 1620 | CTLFLAG_PERMANENT, |
| 1621 | CTLTYPE_NODE, "inet" , |
| 1622 | SYSCTL_DESCR("PF_INET related settings" ), |
| 1623 | NULL, 0, NULL, 0, |
| 1624 | CTL_NET, PF_INET, CTL_EOL); |
| 1625 | sysctl_createv(clog, 0, NULL, NULL, |
| 1626 | CTLFLAG_PERMANENT, |
| 1627 | CTLTYPE_NODE, "ip" , |
| 1628 | SYSCTL_DESCR("IPv4 related settings" ), |
| 1629 | NULL, 0, NULL, 0, |
| 1630 | CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); |
| 1631 | |
| 1632 | sysctl_createv(clog, 0, NULL, NULL, |
| 1633 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1634 | CTLTYPE_INT, "forwarding" , |
| 1635 | SYSCTL_DESCR("Enable forwarding of INET datagrams" ), |
| 1636 | NULL, 0, &ipforwarding, 0, |
| 1637 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1638 | IPCTL_FORWARDING, CTL_EOL); |
| 1639 | sysctl_createv(clog, 0, NULL, NULL, |
| 1640 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1641 | CTLTYPE_INT, "redirect" , |
| 1642 | SYSCTL_DESCR("Enable sending of ICMP redirect messages" ), |
| 1643 | NULL, 0, &ipsendredirects, 0, |
| 1644 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1645 | IPCTL_SENDREDIRECTS, CTL_EOL); |
| 1646 | sysctl_createv(clog, 0, NULL, NULL, |
| 1647 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1648 | CTLTYPE_INT, "ttl" , |
| 1649 | SYSCTL_DESCR("Default TTL for an INET datagram" ), |
| 1650 | NULL, 0, &ip_defttl, 0, |
| 1651 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1652 | IPCTL_DEFTTL, CTL_EOL); |
| 1653 | #ifdef IPCTL_DEFMTU |
| 1654 | sysctl_createv(clog, 0, NULL, NULL, |
| 1655 | CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, |
| 1656 | CTLTYPE_INT, "mtu" , |
| 1657 | SYSCTL_DESCR("Default MTA for an INET route" ), |
| 1658 | NULL, 0, &ip_mtu, 0, |
| 1659 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1660 | IPCTL_DEFMTU, CTL_EOL); |
| 1661 | #endif /* IPCTL_DEFMTU */ |
| 1662 | sysctl_createv(clog, 0, NULL, NULL, |
| 1663 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1664 | CTLTYPE_INT, "forwsrcrt" , |
| 1665 | SYSCTL_DESCR("Enable forwarding of source-routed " |
| 1666 | "datagrams" ), |
| 1667 | sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, |
| 1668 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1669 | IPCTL_FORWSRCRT, CTL_EOL); |
| 1670 | sysctl_createv(clog, 0, NULL, NULL, |
| 1671 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1672 | CTLTYPE_INT, "directed-broadcast" , |
| 1673 | SYSCTL_DESCR("Enable forwarding of broadcast datagrams" ), |
| 1674 | NULL, 0, &ip_directedbcast, 0, |
| 1675 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1676 | IPCTL_DIRECTEDBCAST, CTL_EOL); |
| 1677 | sysctl_createv(clog, 0, NULL, NULL, |
| 1678 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1679 | CTLTYPE_INT, "allowsrcrt" , |
| 1680 | SYSCTL_DESCR("Accept source-routed datagrams" ), |
| 1681 | NULL, 0, &ip_allowsrcrt, 0, |
| 1682 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1683 | IPCTL_ALLOWSRCRT, CTL_EOL); |
| 1684 | |
| 1685 | sysctl_createv(clog, 0, NULL, NULL, |
| 1686 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1687 | CTLTYPE_INT, "mtudisc" , |
| 1688 | SYSCTL_DESCR("Use RFC1191 Path MTU Discovery" ), |
| 1689 | NULL, 0, &ip_mtudisc, 0, |
| 1690 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1691 | IPCTL_MTUDISC, CTL_EOL); |
| 1692 | sysctl_createv(clog, 0, NULL, NULL, |
| 1693 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1694 | CTLTYPE_INT, "anonportmin" , |
| 1695 | SYSCTL_DESCR("Lowest ephemeral port number to assign" ), |
| 1696 | sysctl_net_inet_ip_ports, 0, &anonportmin, 0, |
| 1697 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1698 | IPCTL_ANONPORTMIN, CTL_EOL); |
| 1699 | sysctl_createv(clog, 0, NULL, NULL, |
| 1700 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1701 | CTLTYPE_INT, "anonportmax" , |
| 1702 | SYSCTL_DESCR("Highest ephemeral port number to assign" ), |
| 1703 | sysctl_net_inet_ip_ports, 0, &anonportmax, 0, |
| 1704 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1705 | IPCTL_ANONPORTMAX, CTL_EOL); |
| 1706 | sysctl_createv(clog, 0, NULL, NULL, |
| 1707 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1708 | CTLTYPE_INT, "mtudisctimeout" , |
| 1709 | SYSCTL_DESCR("Lifetime of a Path MTU Discovered route" ), |
| 1710 | sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, |
| 1711 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1712 | IPCTL_MTUDISCTIMEOUT, CTL_EOL); |
| 1713 | #ifndef IPNOPRIVPORTS |
| 1714 | sysctl_createv(clog, 0, NULL, NULL, |
| 1715 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1716 | CTLTYPE_INT, "lowportmin" , |
| 1717 | SYSCTL_DESCR("Lowest privileged ephemeral port number " |
| 1718 | "to assign" ), |
| 1719 | sysctl_net_inet_ip_ports, 0, &lowportmin, 0, |
| 1720 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1721 | IPCTL_LOWPORTMIN, CTL_EOL); |
| 1722 | sysctl_createv(clog, 0, NULL, NULL, |
| 1723 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1724 | CTLTYPE_INT, "lowportmax" , |
| 1725 | SYSCTL_DESCR("Highest privileged ephemeral port number " |
| 1726 | "to assign" ), |
| 1727 | sysctl_net_inet_ip_ports, 0, &lowportmax, 0, |
| 1728 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1729 | IPCTL_LOWPORTMAX, CTL_EOL); |
| 1730 | #endif /* IPNOPRIVPORTS */ |
| 1731 | #if NGRE > 0 |
| 1732 | sysctl_createv(clog, 0, NULL, NULL, |
| 1733 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1734 | CTLTYPE_INT, "grettl" , |
| 1735 | SYSCTL_DESCR("Default TTL for a gre tunnel datagram" ), |
| 1736 | NULL, 0, &ip_gre_ttl, 0, |
| 1737 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1738 | IPCTL_GRE_TTL, CTL_EOL); |
| 1739 | #endif /* NGRE */ |
| 1740 | sysctl_createv(clog, 0, NULL, NULL, |
| 1741 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1742 | CTLTYPE_INT, "checkinterface" , |
| 1743 | SYSCTL_DESCR("Enable receive side of Strong ES model " |
| 1744 | "from RFC1122" ), |
| 1745 | NULL, 0, &ip_checkinterface, 0, |
| 1746 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1747 | IPCTL_CHECKINTERFACE, CTL_EOL); |
| 1748 | sysctl_createv(clog, 0, NULL, NULL, |
| 1749 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1750 | CTLTYPE_INT, "random_id" , |
| 1751 | SYSCTL_DESCR("Assign random ip_id values" ), |
| 1752 | NULL, 0, &ip_do_randomid, 0, |
| 1753 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1754 | IPCTL_RANDOMID, CTL_EOL); |
| 1755 | sysctl_createv(clog, 0, NULL, NULL, |
| 1756 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1757 | CTLTYPE_INT, "do_loopback_cksum" , |
| 1758 | SYSCTL_DESCR("Perform IP checksum on loopback" ), |
| 1759 | NULL, 0, &ip_do_loopback_cksum, 0, |
| 1760 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1761 | IPCTL_LOOPBACKCKSUM, CTL_EOL); |
| 1762 | sysctl_createv(clog, 0, NULL, NULL, |
| 1763 | CTLFLAG_PERMANENT, |
| 1764 | CTLTYPE_STRUCT, "stats" , |
| 1765 | SYSCTL_DESCR("IP statistics" ), |
| 1766 | sysctl_net_inet_ip_stats, 0, NULL, 0, |
| 1767 | CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, |
| 1768 | CTL_EOL); |
| 1769 | #if NARP |
| 1770 | sysctl_createv(clog, 0, NULL, NULL, |
| 1771 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1772 | CTLTYPE_INT, "dad_count" , |
| 1773 | SYSCTL_DESCR("Number of Duplicate Address Detection " |
| 1774 | "probes to send" ), |
| 1775 | NULL, 0, &ip_dad_count, 0, |
| 1776 | CTL_NET, PF_INET, IPPROTO_IP, |
| 1777 | IPCTL_DAD_COUNT, CTL_EOL); |
| 1778 | #endif |
| 1779 | |
| 1780 | /* anonportalgo RFC6056 subtree */ |
| 1781 | const struct sysctlnode *portalgo_node; |
| 1782 | sysctl_createv(clog, 0, NULL, &portalgo_node, |
| 1783 | CTLFLAG_PERMANENT, |
| 1784 | CTLTYPE_NODE, "anonportalgo" , |
| 1785 | SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)" ), |
| 1786 | NULL, 0, NULL, 0, |
| 1787 | CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); |
| 1788 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
| 1789 | CTLFLAG_PERMANENT, |
| 1790 | CTLTYPE_STRING, "available" , |
| 1791 | SYSCTL_DESCR("available algorithms" ), |
| 1792 | sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, |
| 1793 | CTL_CREATE, CTL_EOL); |
| 1794 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
| 1795 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1796 | CTLTYPE_STRING, "selected" , |
| 1797 | SYSCTL_DESCR("selected algorithm" ), |
| 1798 | sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, |
| 1799 | CTL_CREATE, CTL_EOL); |
| 1800 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
| 1801 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 1802 | CTLTYPE_STRUCT, "reserve" , |
| 1803 | SYSCTL_DESCR("bitmap of reserved ports" ), |
| 1804 | sysctl_portalgo_reserve4, 0, NULL, 0, |
| 1805 | CTL_CREATE, CTL_EOL); |
| 1806 | } |
| 1807 | |
| 1808 | void |
| 1809 | ip_statinc(u_int stat) |
| 1810 | { |
| 1811 | |
| 1812 | KASSERT(stat < IP_NSTATS); |
| 1813 | IP_STATINC(stat); |
| 1814 | } |
| 1815 | |