Annotation of src/sys/netinet/ip_input.c, Revision 1.355.2.5
1.355.2.5! martin 1: /* $NetBSD: ip_input.c,v 1.355.2.4 2018/02/12 18:23:29 snj Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.152 itojun 6: *
1.89 itojun 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.
1.152 itojun 18: *
1.89 itojun 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: */
1.76 thorpej 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: */
1.14 cgd 61:
1.1 cgd 62: /*
1.13 mycroft 63: * Copyright (c) 1982, 1986, 1988, 1993
64: * The Regents of the University of California. All rights reserved.
1.1 cgd 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.
1.172 agc 74: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 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: *
1.14 cgd 90: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 91: */
1.141 lukem 92:
93: #include <sys/cdefs.h>
1.355.2.5! martin 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.355.2.4 2018/02/12 18:23:29 snj Exp $");
1.55 scottr 95:
1.324 pooka 96: #ifdef _KERNEL_OPT
1.184 jonathan 97: #include "opt_inet.h"
1.278 christos 98: #include "opt_compat_netbsd.h"
1.62 matt 99: #include "opt_gateway.h"
1.91 thorpej 100: #include "opt_ipsec.h"
1.55 scottr 101: #include "opt_mrouting.h"
1.167 martin 102: #include "opt_mbuftrace.h"
1.135 thorpej 103: #include "opt_inet_csum.h"
1.344 ozaki-r 104: #include "opt_net_mpsafe.h"
1.324 pooka 105: #endif
1.1 cgd 106:
1.325 roy 107: #include "arp.h"
108:
1.5 mycroft 109: #include <sys/param.h>
110: #include <sys/systm.h>
1.318 rmind 111: #include <sys/cpu.h>
1.5 mycroft 112: #include <sys/mbuf.h>
113: #include <sys/domain.h>
114: #include <sys/protosw.h>
115: #include <sys/socket.h>
1.44 thorpej 116: #include <sys/socketvar.h>
1.5 mycroft 117: #include <sys/errno.h>
118: #include <sys/time.h>
119: #include <sys/kernel.h>
1.72 thorpej 120: #include <sys/pool.h>
1.28 christos 121: #include <sys/sysctl.h>
1.230 elad 122: #include <sys/kauth.h>
1.1 cgd 123:
1.5 mycroft 124: #include <net/if.h>
1.44 thorpej 125: #include <net/if_dl.h>
1.5 mycroft 126: #include <net/route.h>
1.318 rmind 127: #include <net/pktqueue.h>
1.45 mrg 128: #include <net/pfil.h>
1.1 cgd 129:
1.5 mycroft 130: #include <netinet/in.h>
131: #include <netinet/in_systm.h>
132: #include <netinet/ip.h>
133: #include <netinet/in_pcb.h>
1.215 yamt 134: #include <netinet/in_proto.h>
1.5 mycroft 135: #include <netinet/in_var.h>
136: #include <netinet/ip_var.h>
1.266 thorpej 137: #include <netinet/ip_private.h>
1.5 mycroft 138: #include <netinet/ip_icmp.h>
1.89 itojun 139: /* just for gif_ttl */
140: #include <netinet/in_gif.h>
141: #include "gif.h"
1.144 martin 142: #include <net/if_gre.h>
143: #include "gre.h"
1.111 jdolecek 144:
145: #ifdef MROUTING
146: #include <netinet/ip_mroute.h>
147: #endif
1.302 christos 148: #include <netinet/portalgo.h>
1.89 itojun 149:
1.304 christos 150: #ifdef IPSEC
1.173 jonathan 151: #include <netipsec/ipsec.h>
1.305 rmind 152: #endif
1.44 thorpej 153:
1.1 cgd 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
1.26 thorpej 164: #ifndef IPFORWSRCRT
1.355.2.4 snj 165: #define IPFORWSRCRT 0 /* forward source-routed packets */
1.47 cjs 166: #endif
167: #ifndef IPALLOWSRCRT
1.355.2.4 snj 168: #define IPALLOWSRCRT 0 /* allow source-routed packets */
1.26 thorpej 169: #endif
1.53 kml 170: #ifndef IPMTUDISC
1.153 itojun 171: #define IPMTUDISC 1
1.53 kml 172: #endif
1.60 kml 173: #ifndef IPMTUDISCTIMEOUT
1.61 kml 174: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 175: #endif
1.53 kml 176:
1.278 christos 177: #ifdef COMPAT_50
178: #include <compat/sys/time.h>
179: #include <compat/sys/socket.h>
180: #endif
181:
1.27 thorpej 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 */
1.1 cgd 193: int ipforwarding = IPFORWARDING;
194: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 195: int ip_defttl = IPDEFTTL;
1.26 thorpej 196: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 197: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 198: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 199: int ip_mtudisc = IPMTUDISC;
1.156 itojun 200: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 201: #ifdef DIAGNOSTIC
202: int ipprintfs = 0;
203: #endif
1.184 jonathan 204:
205: int ip_do_randomid = 0;
206:
1.165 christos 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: */
1.318 rmind 220: static int ip_checkinterface __read_mostly = 0;
1.165 christos 221:
1.60 kml 222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
223:
1.318 rmind 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:
1.340 ozaki-r 229: static percpu_t *ipforward_rt_percpu __cacheline_aligned;
1.286 tls 230:
1.183 jonathan 231: uint16_t ip_id;
1.75 thorpej 232:
1.135 thorpej 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:
1.201 matt 245: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
246: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
247: EVCNT_ATTACH_STATIC(ip_swcsum);
248:
1.135 thorpej 249: #else
250:
251: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
252:
253: #endif /* INET_CSUM_COUNTERS */
254:
1.1 cgd 255: /*
1.354 ozaki-r 256: * Used to save the IP options in case a protocol wants to respond
1.1 cgd 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: */
1.354 ozaki-r 262: struct ip_srcrt {
263: int isr_nhops; /* number of hops */
264: struct in_addr isr_dst; /* final destination */
265: char isr_nop; /* one NOP to align */
266: char isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
267: struct in_addr isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
268: };
1.1 cgd 269:
1.295 dyoung 270: static int ip_drainwanted;
271:
1.354 ozaki-r 272: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35 mycroft 273:
1.164 matt 274: #ifdef MBUFTRACE
1.234 dogcow 275: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
276: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 277: #endif
278:
1.318 rmind 279: static void ipintr(void *);
1.312 rmind 280: static void ip_input(struct mbuf *);
1.329 ozaki-r 281: static void ip_forward(struct mbuf *, int, struct ifnet *);
1.311 rmind 282: static bool ip_dooptions(struct mbuf *);
1.346 ozaki-r 283: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311 rmind 284: static void sysctl_net_inet_ip_setup(struct sysctllog **);
1.284 pooka 285:
1.333 ozaki-r 286: static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *,
287: int *);
288: static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *,
289: struct ip *);
290:
1.344 ozaki-r 291: #ifdef NET_MPSAFE
292: #define SOFTNET_LOCK() mutex_enter(softnet_lock)
293: #define SOFTNET_UNLOCK() mutex_exit(softnet_lock)
294: #else
1.318 rmind 295: #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
296: #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
1.344 ozaki-r 297: #endif
1.318 rmind 298:
1.1 cgd 299: /*
300: * IP initialization: fill in IP protocol switch table.
301: * All protocols not implemented in kernel go to raw IP protocol handler.
302: */
1.8 mycroft 303: void
1.211 perry 304: ip_init(void)
1.1 cgd 305: {
1.199 matt 306: const struct protosw *pr;
1.1 cgd 307:
1.311 rmind 308: in_init();
1.284 pooka 309: sysctl_net_inet_ip_setup(NULL);
310:
1.311 rmind 311: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
312: KASSERT(pr != NULL);
1.275 pooka 313:
1.319 ozaki-r 314: ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318 rmind 315: KASSERT(ip_pktq != NULL);
316:
1.328 riastrad 317: for (u_int i = 0; i < IPPROTO_MAX; i++) {
318: ip_protox[i] = pr - inetsw;
1.311 rmind 319: }
1.328 riastrad 320: for (pr = inetdomain.dom_protosw;
321: pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1 cgd 322: if (pr->pr_domain->dom_family == PF_INET &&
323: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328 riastrad 324: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 325:
1.288 rmind 326: ip_reass_init();
1.190 jonathan 327:
1.291 rmind 328: ip_ids = ip_id_init();
1.323 ozaki-r 329: ip_id = time_uptime & 0xfffff;
1.194 jonathan 330:
1.73 thorpej 331: #ifdef GATEWAY
1.311 rmind 332: ipflow_init();
1.73 thorpej 333: #endif
1.121 thorpej 334:
335: /* Register our Packet Filter hook. */
1.308 rmind 336: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
337: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 338:
1.164 matt 339: #ifdef MBUFTRACE
340: MOWNER_ATTACH(&ip_tx_mowner);
341: MOWNER_ATTACH(&ip_rx_mowner);
342: #endif /* MBUFTRACE */
1.266 thorpej 343:
344: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340 ozaki-r 345: ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
1.352 ozaki-r 346: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1 cgd 347: }
348:
1.333 ozaki-r 349: static struct in_ifaddr *
350: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
351: {
352: struct in_ifaddr *ia = NULL;
353: int checkif;
354:
355: /*
356: * Enable a consistency check between the destination address
357: * and the arrival interface for a unicast packet (the RFC 1122
358: * strong ES model) if IP forwarding is disabled and the packet
359: * is not locally generated.
360: *
361: * XXX - Checking also should be disabled if the destination
362: * address is ipnat'ed to a different interface.
363: *
364: * XXX - Checking is incompatible with IP aliases added
365: * to the loopback interface instead of the interface where
366: * the packets are received.
367: *
368: * XXX - We need to add a per ifaddr flag for this so that
369: * we get finer grain control.
370: */
371: checkif = ip_checkinterface && (ipforwarding == 0) &&
372: (ifp->if_flags & IFF_LOOPBACK) == 0;
373:
1.334 ozaki-r 374: IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333 ozaki-r 375: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
376: if (ia->ia4_flags & IN_IFF_NOTREADY)
377: continue;
378: if (checkif && ia->ia_ifp != ifp)
379: continue;
1.355.2.2 snj 380: if ((ia->ia_ifp->if_flags & IFF_UP) == 0) {
1.338 ozaki-r 381: (*downmatch)++;
1.355.2.2 snj 382: continue;
383: }
384: if (ia->ia4_flags & IN_IFF_DETACHED &&
385: (ifp->if_flags & IFF_LOOPBACK) == 0)
386: continue;
387: break;
1.333 ozaki-r 388: }
389: }
390:
391: return ia;
392: }
393:
394: static struct in_ifaddr *
395: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
396: {
397: struct in_ifaddr *ia = NULL;
398: struct ifaddr *ifa;
399:
1.336 ozaki-r 400: IFADDR_READER_FOREACH(ifa, ifp) {
1.333 ozaki-r 401: if (ifa->ifa_addr->sa_family != AF_INET)
402: continue;
403: ia = ifatoia(ifa);
1.355.2.2 snj 404: if (ia->ia4_flags & IN_IFF_NOTREADY)
405: continue;
406: if (ia->ia4_flags & IN_IFF_DETACHED &&
407: (ifp->if_flags & IFF_LOOPBACK) == 0)
1.333 ozaki-r 408: continue;
409: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
410: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
411: /*
412: * Look for all-0's host part (old broadcast addr),
413: * either for subnet or net.
414: */
415: ip->ip_dst.s_addr == ia->ia_subnet ||
416: ip->ip_dst.s_addr == ia->ia_net)
417: goto matched;
418: /*
419: * An interface with IP address zero accepts
420: * all packets that arrive on that interface.
421: */
422: if (in_nullhost(ia->ia_addr.sin_addr))
423: goto matched;
424: }
425: ia = NULL;
426:
427: matched:
428: return ia;
429: }
430:
1.1 cgd 431: /*
1.318 rmind 432: * IP software interrupt routine.
1.89 itojun 433: */
1.318 rmind 434: static void
435: ipintr(void *arg __unused)
1.89 itojun 436: {
437: struct mbuf *m;
1.286 tls 438:
1.318 rmind 439: KASSERT(cpu_softintr_p());
1.89 itojun 440:
1.355.2.5! martin 441: SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.318 rmind 442: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 443: ip_input(m);
444: }
1.355.2.5! martin 445: SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.89 itojun 446: }
447:
448: /*
1.318 rmind 449: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 450: * try to reassemble. Process options. Pass to next level.
451: */
1.312 rmind 452: static void
1.89 itojun 453: ip_input(struct mbuf *m)
1.1 cgd 454: {
1.109 augustss 455: struct ip *ip = NULL;
1.339 ozaki-r 456: struct in_ifaddr *ia = NULL;
1.288 rmind 457: int hlen = 0, len;
1.100 itojun 458: int downmatch;
1.169 itojun 459: int srcrt = 0;
1.314 rmind 460: ifnet_t *ifp;
1.329 ozaki-r 461: struct psref psref;
1.339 ozaki-r 462: int s;
1.1 cgd 463:
1.318 rmind 464: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
465: "interrupt handler; synchronization assumptions violated");
466:
1.164 matt 467: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 468: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329 ozaki-r 469:
470: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 471: if (__predict_false(ifp == NULL))
1.332 ozaki-r 472: goto out;
1.164 matt 473:
1.1 cgd 474: /*
475: * If no IP addresses have been set yet but the interfaces
476: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 477: * Note: we pre-check without locks held.
1.1 cgd 478: */
1.335 ozaki-r 479: if (IN_ADDRLIST_READER_EMPTY())
1.332 ozaki-r 480: goto out;
1.266 thorpej 481: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 482:
1.154 thorpej 483: /*
484: * If the IP header is not aligned, slurp it up into a new
485: * mbuf with space for link headers, in the event we forward
486: * it. Otherwise, if it is aligned, make sure the entire
487: * base IP header is in the first mbuf of the chain.
488: */
1.244 christos 489: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 490: if ((m = m_copyup(m, sizeof(struct ip),
491: (max_linkhdr + 3) & ~3)) == NULL) {
492: /* XXXJRT new stat, please */
1.266 thorpej 493: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 494: goto out;
1.154 thorpej 495: }
496: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
497: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 498: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 499: goto out;
1.154 thorpej 500: }
1.1 cgd 501: }
502: ip = mtod(m, struct ip *);
1.13 mycroft 503: if (ip->ip_v != IPVERSION) {
1.266 thorpej 504: IP_STATINC(IP_STAT_BADVERS);
1.332 ozaki-r 505: goto out;
1.13 mycroft 506: }
1.1 cgd 507: hlen = ip->ip_hl << 2;
508: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 509: IP_STATINC(IP_STAT_BADHLEN);
1.332 ozaki-r 510: goto out;
1.1 cgd 511: }
512: if (hlen > m->m_len) {
1.298 liamjfoy 513: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 514: IP_STATINC(IP_STAT_BADHLEN);
1.329 ozaki-r 515: goto out;
1.1 cgd 516: }
517: ip = mtod(m, struct ip *);
518: }
1.98 thorpej 519:
1.85 hwr 520: /*
1.99 thorpej 521: * RFC1122: packets with a multicast source address are
1.98 thorpej 522: * not allowed.
1.85 hwr 523: */
524: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 525: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 526: goto out;
1.129 itojun 527: }
528:
529: /* 127/8 must not appear on wire - RFC1122 */
530: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
531: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314 rmind 532: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 533: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 534: goto out;
1.130 itojun 535: }
1.85 hwr 536: }
537:
1.135 thorpej 538: switch (m->m_pkthdr.csum_flags &
1.314 rmind 539: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 540: M_CSUM_IPv4_BAD)) {
541: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
542: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332 ozaki-r 543: IP_STATINC(IP_STAT_BADSUM);
544: goto out;
1.135 thorpej 545:
546: case M_CSUM_IPv4:
547: /* Checksum was okay. */
548: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
549: break;
550:
551: default:
1.206 thorpej 552: /*
553: * Must compute it ourselves. Maybe skip checksum on
554: * loopback interfaces.
555: */
1.314 rmind 556: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
557: ip_do_loopback_cksum)) {
1.206 thorpej 558: INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332 ozaki-r 559: if (in_cksum(m, hlen) != 0) {
560: IP_STATINC(IP_STAT_BADSUM);
561: goto out;
562: }
1.206 thorpej 563: }
1.135 thorpej 564: break;
1.1 cgd 565: }
566:
1.121 thorpej 567: /* Retrieve the packet length. */
568: len = ntohs(ip->ip_len);
1.81 proff 569:
570: /*
571: * Check for additional length bogosity
572: */
1.84 proff 573: if (len < hlen) {
1.266 thorpej 574: IP_STATINC(IP_STAT_BADLEN);
1.332 ozaki-r 575: goto out;
1.81 proff 576: }
1.1 cgd 577:
578: /*
579: * Check that the amount of data in the buffers
580: * is as at least much as the IP header would have us expect.
581: * Trim mbufs if longer than we expect.
582: * Drop packet if shorter than we expect.
583: */
1.35 mycroft 584: if (m->m_pkthdr.len < len) {
1.266 thorpej 585: IP_STATINC(IP_STAT_TOOSHORT);
1.332 ozaki-r 586: goto out;
1.1 cgd 587: }
1.35 mycroft 588: if (m->m_pkthdr.len > len) {
1.1 cgd 589: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 590: m->m_len = len;
591: m->m_pkthdr.len = len;
1.1 cgd 592: } else
1.35 mycroft 593: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 594: }
595:
1.64 thorpej 596: /*
597: * Assume that we can create a fast-forward IP flow entry
598: * based on this packet.
599: */
600: m->m_flags |= M_CANFASTFWD;
601:
1.33 mrg 602: /*
1.64 thorpej 603: * Run through list of hooks for input packets. If there are any
604: * filters which require that additional packets in the flow are
605: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
606: * Note that filters must _never_ set this flag, as another filter
607: * in the list may have previously cleared it.
1.33 mrg 608: */
1.304 christos 609: #if defined(IPSEC)
1.317 christos 610: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 611: #else
612: if (1)
613: #endif
614: {
1.314 rmind 615: struct in_addr odst = ip->ip_dst;
1.318 rmind 616: bool freed;
1.169 itojun 617:
1.318 rmind 618: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
619: if (freed || m == NULL) {
1.343 ozaki-r 620: m = NULL;
1.329 ozaki-r 621: goto out;
1.318 rmind 622: }
1.127 itojun 623: ip = mtod(m, struct ip *);
1.142 darrenr 624: hlen = ip->ip_hl << 2;
1.318 rmind 625:
1.205 darrenr 626: /*
627: * XXX The setting of "srcrt" here is to prevent ip_forward()
628: * from generating ICMP redirects for packets that have
629: * been redirected by a hook back out on to the same LAN that
630: * they came from and is not an indication that the packet
631: * is being inffluenced by source routing options. This
632: * allows things like
633: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
634: * where tlp0 is both on the 1.1.1.0/24 network and is the
635: * default route for hosts on 1.1.1.0/24. Of course this
636: * also requires a "map tlp0 ..." to complete the story.
637: * One might argue whether or not this kind of network config.
1.212 perry 638: * should be supported in this manner...
1.205 darrenr 639: */
1.169 itojun 640: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 641: }
1.123 thorpej 642:
643: #ifdef ALTQ
644: /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318 rmind 645: if (altq_input) {
646: SOFTNET_LOCK();
647: if ((*altq_input)(m, AF_INET) == 0) {
648: /* Packet dropped by traffic conditioner. */
649: SOFTNET_UNLOCK();
1.343 ozaki-r 650: m = NULL;
1.329 ozaki-r 651: goto out;
1.318 rmind 652: }
653: SOFTNET_UNLOCK();
1.123 thorpej 654: }
655: #endif
1.121 thorpej 656:
657: /*
1.1 cgd 658: * Process options and, if not destined for us,
659: * ship it on. ip_dooptions returns 1 when an
660: * error was detected (causing an icmp message
661: * to be sent and the original packet to be freed).
662: */
1.343 ozaki-r 663: if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
664: m = NULL;
1.329 ozaki-r 665: goto out;
1.343 ozaki-r 666: }
1.1 cgd 667:
668: /*
669: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 670: *
671: * Traditional 4.4BSD did not consult IFF_UP at all.
672: * The behavior here is to treat addresses on !IFF_UP interface
1.321 roy 673: * or IN_IFF_NOTREADY addresses as not mine.
1.1 cgd 674: */
1.100 itojun 675: downmatch = 0;
1.339 ozaki-r 676: s = pserialize_read_enter();
1.333 ozaki-r 677: ia = ip_match_our_address(ifp, ip, &downmatch);
1.339 ozaki-r 678: if (ia != NULL) {
679: pserialize_read_exit(s);
1.86 thorpej 680: goto ours;
1.339 ozaki-r 681: }
1.333 ozaki-r 682:
1.315 christos 683: if (ifp->if_flags & IFF_BROADCAST) {
1.333 ozaki-r 684: ia = ip_match_our_address_broadcast(ifp, ip);
1.339 ozaki-r 685: if (ia != NULL) {
686: pserialize_read_exit(s);
1.333 ozaki-r 687: goto ours;
1.339 ozaki-r 688: }
1.1 cgd 689: }
1.339 ozaki-r 690: pserialize_read_exit(s);
1.333 ozaki-r 691:
1.18 mycroft 692: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 693: #ifdef MROUTING
694: extern struct socket *ip_mrouter;
1.10 brezak 695:
1.4 hpeyerl 696: if (ip_mrouter) {
697: /*
698: * If we are acting as a multicast router, all
699: * incoming multicast packets are passed to the
700: * kernel-level multicast forwarding function.
701: * The packet is returned (relatively) intact; if
702: * ip_mforward() returns a non-zero value, the packet
703: * must be discarded, else it may be accepted below.
704: *
705: * (The IP ident field is put in the same byte order
706: * as expected when ip_mforward() is called from
707: * ip_output().)
708: */
1.318 rmind 709: SOFTNET_LOCK();
1.314 rmind 710: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 711: SOFTNET_UNLOCK();
1.266 thorpej 712: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 713: goto out;
1.4 hpeyerl 714: }
1.318 rmind 715: SOFTNET_UNLOCK();
1.4 hpeyerl 716:
717: /*
718: * The process-level routing demon needs to receive
719: * all multicast IGMP packets, whether or not this
720: * host belongs to their destination groups.
721: */
1.318 rmind 722: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 723: goto ours;
1.318 rmind 724: }
1.266 thorpej 725: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 726: }
727: #endif
728: /*
729: * See if we belong to the destination multicast group on the
730: * arrival interface.
731: */
1.316 rmind 732: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 733: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 734: goto out;
1.4 hpeyerl 735: }
736: goto ours;
737: }
1.19 mycroft 738: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 739: in_nullhost(ip->ip_dst))
1.1 cgd 740: goto ours;
741:
742: /*
743: * Not for us; forward if possible and desirable.
744: */
745: if (ipforwarding == 0) {
1.329 ozaki-r 746: m_put_rcvif_psref(ifp, &psref);
1.266 thorpej 747: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 748: m_freem(m);
1.100 itojun 749: } else {
750: /*
751: * If ip_dst matched any of my address on !IFF_UP interface,
752: * and there's no IFF_UP interface that matches ip_dst,
753: * send icmp unreach. Forwarding it will result in in-kernel
754: * forwarding loop till TTL goes to 0.
755: */
756: if (downmatch) {
1.329 ozaki-r 757: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 758: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 759: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 760: return;
761: }
1.304 christos 762: #ifdef IPSEC
1.355.2.1 snj 763: /* Check the security policy (SP) for the packet */
1.318 rmind 764: if (ipsec_used) {
765: if (ipsec4_input(m, IP_FORWARDING |
766: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
1.332 ozaki-r 767: goto out;
1.318 rmind 768: }
1.173 jonathan 769: }
1.305 rmind 770: #endif
1.329 ozaki-r 771: ip_forward(m, srcrt, ifp);
772: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 773: }
1.89 itojun 774: return;
1.1 cgd 775:
776: ours:
1.329 ozaki-r 777: m_put_rcvif_psref(ifp, &psref);
1.331 ozaki-r 778: ifp = NULL;
1.329 ozaki-r 779:
1.1 cgd 780: /*
781: * If offset or IP_MF are set, must reassemble.
782: */
1.155 itojun 783: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 784: /*
785: * Pass to IP reassembly mechanism.
786: */
1.290 rmind 787: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 788: /* Failed; invalid fragment(s) or packet. */
1.332 ozaki-r 789: goto out;
1.16 cgd 790: }
1.290 rmind 791: if (m == NULL) {
1.289 rmind 792: /* More fragments should come; silently return. */
1.332 ozaki-r 793: goto out;
1.289 rmind 794: }
1.290 rmind 795: /*
796: * Reassembly is done, we have the final packet.
797: * Updated cached data in local variable(s).
798: */
1.289 rmind 799: ip = mtod(m, struct ip *);
800: hlen = ip->ip_hl << 2;
1.79 mycroft 801: }
1.128 itojun 802:
1.304 christos 803: #ifdef IPSEC
1.173 jonathan 804: /*
1.305 rmind 805: * Enforce IPsec policy checking if we are seeing last header.
806: * Note that we do not visit this with protocols with PCB layer
807: * code - like UDP/TCP/raw IP.
1.173 jonathan 808: */
1.317 christos 809: if (ipsec_used &&
1.328 riastrad 810: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.305 rmind 811: if (ipsec4_input(m, 0) != 0) {
1.332 ozaki-r 812: goto out;
1.173 jonathan 813: }
814: }
1.305 rmind 815: #endif
1.1 cgd 816:
817: /*
818: * Switch out to protocol's input routine.
819: */
1.82 aidan 820: #if IFA_STATS
1.339 ozaki-r 821: if (ia && ip) {
822: struct in_ifaddr *_ia;
823: /*
824: * Keep a reference from ip_match_our_address with psref
825: * is expensive, so explore ia here again.
826: */
827: s = pserialize_read_enter();
1.342 ozaki-r 828: _ia = in_get_ia(ip->ip_dst);
1.339 ozaki-r 829: _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
830: pserialize_read_exit(s);
831: }
1.82 aidan 832: #endif
1.266 thorpej 833: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 834:
1.318 rmind 835: const int off = hlen, nh = ip->ip_p;
836:
1.328 riastrad 837: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.89 itojun 838: return;
1.135 thorpej 839:
1.329 ozaki-r 840: out:
841: m_put_rcvif_psref(ifp, &psref);
1.332 ozaki-r 842: if (m != NULL)
843: m_freem(m);
1.1 cgd 844: }
845:
846: /*
1.288 rmind 847: * IP timer processing.
1.1 cgd 848: */
1.8 mycroft 849: void
1.211 perry 850: ip_slowtimo(void)
1.1 cgd 851: {
1.268 ad 852:
1.355.2.3 snj 853: SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.1 cgd 854:
1.288 rmind 855: ip_reass_slowtimo();
1.268 ad 856:
1.355.2.3 snj 857: SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.1 cgd 858: }
859:
860: /*
1.288 rmind 861: * IP drain processing.
1.1 cgd 862: */
1.8 mycroft 863: void
1.211 perry 864: ip_drain(void)
1.1 cgd 865: {
866:
1.268 ad 867: KERNEL_LOCK(1, NULL);
1.288 rmind 868: ip_reass_drain();
1.268 ad 869: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 870: }
871:
872: /*
1.311 rmind 873: * ip_dooptions: perform option processing on a datagram, possibly discarding
874: * it if bad options are encountered, or forwarding it if source-routed.
875: *
876: * => Returns true if packet has been forwarded/freed.
877: * => Returns false if the packet should be processed further.
1.1 cgd 878: */
1.311 rmind 879: static bool
1.211 perry 880: ip_dooptions(struct mbuf *m)
1.1 cgd 881: {
1.109 augustss 882: struct ip *ip = mtod(m, struct ip *);
883: u_char *cp, *cp0;
884: struct ip_timestamp *ipt;
885: struct in_ifaddr *ia;
1.1 cgd 886: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 887: struct in_addr dst;
1.1 cgd 888: n_time ntime;
1.349 ozaki-r 889: struct ifaddr *ifa = NULL;
1.339 ozaki-r 890: int s;
1.1 cgd 891:
1.13 mycroft 892: dst = ip->ip_dst;
1.1 cgd 893: cp = (u_char *)(ip + 1);
894: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
895: for (; cnt > 0; cnt -= optlen, cp += optlen) {
896: opt = cp[IPOPT_OPTVAL];
897: if (opt == IPOPT_EOL)
898: break;
899: if (opt == IPOPT_NOP)
900: optlen = 1;
901: else {
1.113 itojun 902: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
903: code = &cp[IPOPT_OLEN] - (u_char *)ip;
904: goto bad;
905: }
1.1 cgd 906: optlen = cp[IPOPT_OLEN];
1.114 itojun 907: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 908: code = &cp[IPOPT_OLEN] - (u_char *)ip;
909: goto bad;
910: }
911: }
912: switch (opt) {
913:
914: default:
915: break;
916:
917: /*
918: * Source routing with record.
919: * Find interface with current destination address.
920: * If none on this machine then drop if strictly routed,
921: * or do nothing if loosely routed.
922: * Record interface address and bring up next address
923: * component. If strictly routed make sure next
924: * address is on directly accessible net.
925: */
926: case IPOPT_LSRR:
1.346 ozaki-r 927: case IPOPT_SSRR: {
928: struct psref psref;
1.353 ozaki-r 929: struct sockaddr_in ipaddr = {
930: .sin_len = sizeof(ipaddr),
931: .sin_family = AF_INET,
932: };
933:
1.47 cjs 934: if (ip_allowsrcrt == 0) {
935: type = ICMP_UNREACH;
936: code = ICMP_UNREACH_NET_PROHIB;
937: goto bad;
938: }
1.114 itojun 939: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
940: code = &cp[IPOPT_OLEN] - (u_char *)ip;
941: goto bad;
942: }
1.1 cgd 943: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
944: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
945: goto bad;
946: }
947: ipaddr.sin_addr = ip->ip_dst;
1.339 ozaki-r 948:
949: s = pserialize_read_enter();
950: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
951: if (ifa == NULL) {
952: pserialize_read_exit(s);
1.1 cgd 953: if (opt == IPOPT_SSRR) {
954: type = ICMP_UNREACH;
955: code = ICMP_UNREACH_SRCFAIL;
956: goto bad;
957: }
958: /*
959: * Loose routing, and not at next destination
960: * yet; nothing to do except forward.
961: */
962: break;
963: }
1.339 ozaki-r 964: pserialize_read_exit(s);
965:
1.1 cgd 966: off--; /* 0 origin */
1.112 sommerfe 967: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 968: /*
969: * End of source route. Should be for us.
970: */
1.354 ozaki-r 971: save_rte(m, cp, ip->ip_src);
1.1 cgd 972: break;
973: }
974: /*
975: * locate outgoing interface
976: */
1.281 tsutsui 977: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 978: sizeof(ipaddr.sin_addr));
1.339 ozaki-r 979: if (opt == IPOPT_SSRR) {
1.346 ozaki-r 980: ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
981: &psref);
1.339 ozaki-r 982: if (ifa != NULL)
983: ia = ifatoia(ifa);
984: else
985: ia = NULL;
986: } else {
1.346 ozaki-r 987: ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339 ozaki-r 988: }
989: if (ia == NULL) {
1.1 cgd 990: type = ICMP_UNREACH;
991: code = ICMP_UNREACH_SRCFAIL;
992: goto bad;
993: }
994: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 995: bcopy((void *)&ia->ia_addr.sin_addr,
996: (void *)(cp + off), sizeof(struct in_addr));
1.346 ozaki-r 997: ia4_release(ia, &psref);
1.1 cgd 998: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 999: /*
1000: * Let ip_intr's mcast routing check handle mcast pkts
1001: */
1.18 mycroft 1002: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1003: break;
1.346 ozaki-r 1004: }
1.1 cgd 1005:
1.346 ozaki-r 1006: case IPOPT_RR: {
1007: struct psref psref;
1.353 ozaki-r 1008: struct sockaddr_in ipaddr = {
1009: .sin_len = sizeof(ipaddr),
1010: .sin_family = AF_INET,
1011: };
1012:
1.114 itojun 1013: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1014: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1015: goto bad;
1016: }
1.1 cgd 1017: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1018: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1019: goto bad;
1020: }
1021: /*
1022: * If no space remains, ignore.
1023: */
1024: off--; /* 0 origin */
1.112 sommerfe 1025: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1026: break;
1.281 tsutsui 1027: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1028: sizeof(ipaddr.sin_addr));
1029: /*
1030: * locate outgoing interface; if we're the destination,
1031: * use the incoming interface (should be same).
1032: */
1.346 ozaki-r 1033: ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339 ozaki-r 1034: if (ifa == NULL) {
1.346 ozaki-r 1035: ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339 ozaki-r 1036: if (ia == NULL) {
1037: type = ICMP_UNREACH;
1038: code = ICMP_UNREACH_HOST;
1039: goto bad;
1040: }
1041: } else {
1042: ia = ifatoia(ifa);
1.1 cgd 1043: }
1.244 christos 1044: bcopy((void *)&ia->ia_addr.sin_addr,
1045: (void *)(cp + off), sizeof(struct in_addr));
1.346 ozaki-r 1046: ia4_release(ia, &psref);
1.1 cgd 1047: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1048: break;
1.346 ozaki-r 1049: }
1.1 cgd 1050:
1051: case IPOPT_TS:
1052: code = cp - (u_char *)ip;
1053: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1054: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1055: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1056: goto bad;
1.114 itojun 1057: }
1058: if (ipt->ipt_ptr < 5) {
1059: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1060: goto bad;
1061: }
1.15 cgd 1062: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1063: if (++ipt->ipt_oflw == 0) {
1064: code = (u_char *)&ipt->ipt_ptr -
1065: (u_char *)ip;
1.1 cgd 1066: goto bad;
1.114 itojun 1067: }
1.1 cgd 1068: break;
1069: }
1.104 thorpej 1070: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1071: switch (ipt->ipt_flg) {
1072:
1073: case IPOPT_TS_TSONLY:
1074: break;
1075:
1.329 ozaki-r 1076: case IPOPT_TS_TSANDADDR: {
1077: struct ifnet *rcvif;
1.339 ozaki-r 1078: int _s, _ss;
1.353 ozaki-r 1079: struct sockaddr_in ipaddr = {
1080: .sin_len = sizeof(ipaddr),
1081: .sin_family = AF_INET,
1082: };
1.329 ozaki-r 1083:
1.66 thorpej 1084: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1085: sizeof(struct in_addr) > ipt->ipt_len) {
1086: code = (u_char *)&ipt->ipt_ptr -
1087: (u_char *)ip;
1.1 cgd 1088: goto bad;
1.114 itojun 1089: }
1.13 mycroft 1090: ipaddr.sin_addr = dst;
1.339 ozaki-r 1091: _ss = pserialize_read_enter();
1092: rcvif = m_get_rcvif(m, &_s);
1.349 ozaki-r 1093: if (__predict_true(rcvif != NULL)) {
1094: ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
1095: rcvif);
1096: }
1.339 ozaki-r 1097: m_put_rcvif(rcvif, &_s);
1098: if (ifa == NULL) {
1099: pserialize_read_exit(_ss);
1100: break;
1101: }
1102: ia = ifatoia(ifa);
1.104 thorpej 1103: bcopy(&ia->ia_addr.sin_addr,
1104: cp0, sizeof(struct in_addr));
1.339 ozaki-r 1105: pserialize_read_exit(_ss);
1.1 cgd 1106: ipt->ipt_ptr += sizeof(struct in_addr);
1107: break;
1.329 ozaki-r 1108: }
1.1 cgd 1109:
1.353 ozaki-r 1110: case IPOPT_TS_PRESPEC: {
1111: struct sockaddr_in ipaddr = {
1112: .sin_len = sizeof(ipaddr),
1113: .sin_family = AF_INET,
1114: };
1115:
1.66 thorpej 1116: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1117: sizeof(struct in_addr) > ipt->ipt_len) {
1118: code = (u_char *)&ipt->ipt_ptr -
1119: (u_char *)ip;
1.1 cgd 1120: goto bad;
1.114 itojun 1121: }
1.281 tsutsui 1122: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1123: sizeof(struct in_addr));
1.339 ozaki-r 1124: s = pserialize_read_enter();
1125: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
1126: if (ifa == NULL) {
1127: pserialize_read_exit(s);
1.1 cgd 1128: continue;
1.339 ozaki-r 1129: }
1130: pserialize_read_exit(s);
1.1 cgd 1131: ipt->ipt_ptr += sizeof(struct in_addr);
1132: break;
1.353 ozaki-r 1133: }
1.1 cgd 1134:
1135: default:
1.114 itojun 1136: /* XXX can't take &ipt->ipt_flg */
1137: code = (u_char *)&ipt->ipt_ptr -
1138: (u_char *)ip + 1;
1.1 cgd 1139: goto bad;
1140: }
1141: ntime = iptime();
1.107 thorpej 1142: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1143: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1144: sizeof(n_time));
1145: ipt->ipt_ptr += sizeof(n_time);
1146: }
1147: }
1148: if (forward) {
1.329 ozaki-r 1149: struct ifnet *rcvif;
1.339 ozaki-r 1150: struct psref _psref;
1.329 ozaki-r 1151:
1.26 thorpej 1152: if (ip_forwsrcrt == 0) {
1153: type = ICMP_UNREACH;
1154: code = ICMP_UNREACH_SRCFAIL;
1155: goto bad;
1156: }
1.329 ozaki-r 1157:
1.339 ozaki-r 1158: rcvif = m_get_rcvif_psref(m, &_psref);
1.330 ozaki-r 1159: if (__predict_false(rcvif == NULL)) {
1160: type = ICMP_UNREACH;
1161: code = ICMP_UNREACH_HOST;
1162: goto bad;
1163: }
1.329 ozaki-r 1164: ip_forward(m, 1, rcvif);
1.339 ozaki-r 1165: m_put_rcvif_psref(rcvif, &_psref);
1.311 rmind 1166: return true;
1.13 mycroft 1167: }
1.311 rmind 1168: return false;
1.1 cgd 1169: bad:
1.13 mycroft 1170: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1171: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1172: return true;
1.1 cgd 1173: }
1174:
1175: /*
1.311 rmind 1176: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1177: * return internet address info of interface to be used to get there.
1178: */
1.311 rmind 1179: static struct in_ifaddr *
1.346 ozaki-r 1180: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1 cgd 1181: {
1.249 dyoung 1182: struct rtentry *rt;
1183: union {
1184: struct sockaddr dst;
1185: struct sockaddr_in dst4;
1186: } u;
1.340 ozaki-r 1187: struct route *ro;
1.249 dyoung 1188:
1189: sockaddr_in_init(&u.dst4, &dst, 0);
1190:
1.340 ozaki-r 1191: ro = percpu_getref(ipforward_rt_percpu);
1192: rt = rtcache_lookup(ro, &u.dst);
1.345 ozaki-r 1193: if (rt == NULL) {
1194: percpu_putref(ipforward_rt_percpu);
1195: return NULL;
1196: }
1197:
1.346 ozaki-r 1198: ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345 ozaki-r 1199: rtcache_unref(rt, ro);
1.340 ozaki-r 1200: percpu_putref(ipforward_rt_percpu);
1.249 dyoung 1201:
1202: return ifatoia(rt->rt_ifa);
1.1 cgd 1203: }
1204:
1205: /*
1.311 rmind 1206: * save_rte: save incoming source route for use in replies, to be picked
1207: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1208: */
1.311 rmind 1209: static void
1.354 ozaki-r 1210: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1 cgd 1211: {
1.354 ozaki-r 1212: struct ip_srcrt *isr;
1213: struct m_tag *mtag;
1.1 cgd 1214: unsigned olen;
1215:
1216: olen = option[IPOPT_OLEN];
1.354 ozaki-r 1217: if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
1218: return;
1219:
1220: mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
1221: if (mtag == NULL)
1.1 cgd 1222: return;
1.354 ozaki-r 1223: isr = (struct ip_srcrt *)(mtag + 1);
1224:
1225: memcpy(isr->isr_hdr, option, olen);
1226: isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1227: isr->isr_dst = dst;
1228: m_tag_prepend(m, mtag);
1.1 cgd 1229: }
1230:
1231: /*
1232: * Retrieve incoming source route for use in replies,
1233: * in the same form used by setsockopt.
1234: * The first hop is placed before the options, will be removed later.
1235: */
1236: struct mbuf *
1.354 ozaki-r 1237: ip_srcroute(struct mbuf *m0)
1.1 cgd 1238: {
1.109 augustss 1239: struct in_addr *p, *q;
1240: struct mbuf *m;
1.354 ozaki-r 1241: struct ip_srcrt *isr;
1242: struct m_tag *mtag;
1243:
1244: mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
1245: if (mtag == NULL)
1246: return NULL;
1247: isr = (struct ip_srcrt *)(mtag + 1);
1.1 cgd 1248:
1.354 ozaki-r 1249: if (isr->isr_nhops == 0)
1.237 dyoung 1250: return NULL;
1.354 ozaki-r 1251:
1.1 cgd 1252: m = m_get(M_DONTWAIT, MT_SOOPTS);
1.354 ozaki-r 1253: if (m == NULL)
1.237 dyoung 1254: return NULL;
1.1 cgd 1255:
1.164 matt 1256: MCLAIM(m, &inetdomain.dom_mowner);
1.354 ozaki-r 1257: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1 cgd 1258:
1.354 ozaki-r 1259: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
1260: m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1 cgd 1261:
1262: /*
1263: * First save first hop for return route
1264: */
1.354 ozaki-r 1265: p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1 cgd 1266: *(mtod(m, struct in_addr *)) = *p--;
1267:
1268: /*
1269: * Copy option fields and padding (nop) to mbuf.
1270: */
1.354 ozaki-r 1271: isr->isr_nop = IPOPT_NOP;
1272: isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
1273: memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244 christos 1274: OPTSIZ);
1275: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1276: sizeof(struct in_addr) + OPTSIZ);
1277: #undef OPTSIZ
1278: /*
1279: * Record return path as an IP source route,
1280: * reversing the path (pointers are now aligned).
1281: */
1.354 ozaki-r 1282: while (p >= isr->isr_routes) {
1.1 cgd 1283: *q++ = *p--;
1284: }
1285: /*
1286: * Last hop goes to final destination.
1287: */
1.354 ozaki-r 1288: *q = isr->isr_dst;
1289: m_tag_delete(m0, mtag);
1290: return m;
1.1 cgd 1291: }
1292:
1.139 matt 1293: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1294: [PRC_MSGSIZE] = EMSGSIZE,
1295: [PRC_HOSTDEAD] = EHOSTDOWN,
1296: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1297: [PRC_UNREACH_NET] = EHOSTUNREACH,
1298: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1299: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1300: [PRC_UNREACH_PORT] = ECONNREFUSED,
1301: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1302: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1303: };
1304:
1.295 dyoung 1305: void
1306: ip_fasttimo(void)
1307: {
1308: if (ip_drainwanted) {
1309: ip_drain();
1310: ip_drainwanted = 0;
1311: }
1312: }
1313:
1314: void
1315: ip_drainstub(void)
1316: {
1317: ip_drainwanted = 1;
1318: }
1319:
1.1 cgd 1320: /*
1321: * Forward a packet. If some error occurs return the sender
1322: * an icmp packet. Note we can't always generate a meaningful
1323: * icmp message because icmp doesn't have a large enough repertoire
1324: * of codes and types.
1325: *
1326: * If not forwarding, just drop the packet. This could be confusing
1327: * if ipforwarding was zero but some routing protocol was advancing
1328: * us as a gateway to somewhere. However, we must let the routing
1329: * protocol deal with that.
1330: *
1331: * The srcrt parameter indicates whether the packet is being forwarded
1332: * via a source route.
1333: */
1.313 rmind 1334: static void
1.329 ozaki-r 1335: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1 cgd 1336: {
1.109 augustss 1337: struct ip *ip = mtod(m, struct ip *);
1338: struct rtentry *rt;
1.220 christos 1339: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1340: struct mbuf *mcopy;
1.13 mycroft 1341: n_long dest;
1.249 dyoung 1342: union {
1343: struct sockaddr dst;
1344: struct sockaddr_in dst4;
1345: } u;
1.320 ozaki-r 1346: uint64_t *ips;
1.340 ozaki-r 1347: struct route *ro;
1.164 matt 1348:
1.318 rmind 1349: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1350: "interrupt handler; synchronization assumptions violated");
1351:
1.164 matt 1352: /*
1353: * We are now in the output path.
1354: */
1355: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1356:
1357: /*
1358: * Clear any in-bound checksum flags for this packet.
1359: */
1360: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1361:
1.13 mycroft 1362: dest = 0;
1.93 sommerfe 1363: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1364: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1365: m_freem(m);
1366: return;
1367: }
1.318 rmind 1368:
1.1 cgd 1369: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1370: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1371: return;
1372: }
1373:
1.249 dyoung 1374: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1375:
1.340 ozaki-r 1376: ro = percpu_getref(ipforward_rt_percpu);
1.345 ozaki-r 1377: rt = rtcache_lookup(ro, &u.dst);
1378: if (rt == NULL) {
1.340 ozaki-r 1379: percpu_putref(ipforward_rt_percpu);
1.249 dyoung 1380: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1381: return;
1.1 cgd 1382: }
1383:
1384: /*
1.34 mycroft 1385: * Save at most 68 bytes of the packet in case
1.1 cgd 1386: * we need to generate an ICMP message to the src.
1.119 itojun 1387: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1388: */
1.155 itojun 1389: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1390: if (mcopy)
1391: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1392:
1.221 christos 1393: ip->ip_ttl -= IPTTLDEC;
1394:
1.1 cgd 1395: /*
1396: * If forwarding packet using same interface that it came in on,
1397: * perhaps should send a redirect to sender to shortcut a hop.
1398: * Only send redirect if source is sending directly to us,
1399: * and if packet was not source routed (or has any options).
1400: * Also, don't send redirect if forwarding using a default route
1401: * or a route modified by a redirect.
1402: */
1.329 ozaki-r 1403: if (rt->rt_ifp == rcvif &&
1.1 cgd 1404: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1405: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1406: ipsendredirects && !srcrt) {
1.19 mycroft 1407: if (rt->rt_ifa &&
1408: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1409: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1410: if (rt->rt_flags & RTF_GATEWAY)
1411: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1412: else
1413: dest = ip->ip_dst.s_addr;
1414: /*
1415: * Router requirements says to only send host
1416: * redirects.
1417: */
1418: type = ICMP_REDIRECT;
1419: code = ICMP_REDIRECT_HOST;
1.1 cgd 1420: }
1421: }
1.345 ozaki-r 1422: rtcache_unref(rt, ro);
1.1 cgd 1423:
1.340 ozaki-r 1424: error = ip_output(m, NULL, ro,
1.173 jonathan 1425: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1426: NULL, NULL);
1.173 jonathan 1427:
1.320 ozaki-r 1428: if (error) {
1.266 thorpej 1429: IP_STATINC(IP_STAT_CANTFORWARD);
1.320 ozaki-r 1430: goto error;
1431: }
1432:
1433: ips = IP_STAT_GETREF();
1434: ips[IP_STAT_FORWARD]++;
1435:
1436: if (type) {
1437: ips[IP_STAT_REDIRECTSENT]++;
1438: IP_STAT_PUTREF();
1439: goto redirect;
1440: }
1441:
1442: IP_STAT_PUTREF();
1443: if (mcopy) {
1.63 matt 1444: #ifdef GATEWAY
1.320 ozaki-r 1445: if (mcopy->m_flags & M_CANFASTFWD)
1.340 ozaki-r 1446: ipflow_create(ro, mcopy);
1.63 matt 1447: #endif
1.320 ozaki-r 1448: m_freem(mcopy);
1.1 cgd 1449: }
1.320 ozaki-r 1450:
1.340 ozaki-r 1451: percpu_putref(ipforward_rt_percpu);
1.320 ozaki-r 1452: return;
1453:
1454: redirect:
1455: error:
1.318 rmind 1456: if (mcopy == NULL) {
1.340 ozaki-r 1457: percpu_putref(ipforward_rt_percpu);
1.1 cgd 1458: return;
1.318 rmind 1459: }
1.13 mycroft 1460:
1.1 cgd 1461: switch (error) {
1462:
1463: case 0: /* forwarded, but need redirect */
1464: /* type, code set above */
1465: break;
1466:
1467: case ENETUNREACH: /* shouldn't happen, checked above */
1468: case EHOSTUNREACH:
1469: case ENETDOWN:
1470: case EHOSTDOWN:
1471: default:
1472: type = ICMP_UNREACH;
1473: code = ICMP_UNREACH_HOST;
1474: break;
1475:
1476: case EMSGSIZE:
1477: type = ICMP_UNREACH;
1478: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1479:
1.345 ozaki-r 1480: if ((rt = rtcache_validate(ro)) != NULL) {
1.274 seanb 1481: destmtu = rt->rt_ifp->if_mtu;
1.345 ozaki-r 1482: rtcache_unref(rt, ro);
1483: }
1.305 rmind 1484: #ifdef IPSEC
1.317 christos 1485: if (ipsec_used)
1486: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1487: #endif
1.266 thorpej 1488: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1489: break;
1490:
1491: case ENOBUFS:
1.143 itojun 1492: /*
1.311 rmind 1493: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
1494: * Requirements for IP Version 4 Routers. Source quench can
1495: * big problem under DoS attacks or if the underlying
1496: * interface is rate-limited.
1.143 itojun 1497: */
1498: if (mcopy)
1499: m_freem(mcopy);
1.340 ozaki-r 1500: percpu_putref(ipforward_rt_percpu);
1.143 itojun 1501: return;
1.1 cgd 1502: }
1.220 christos 1503: icmp_error(mcopy, type, code, dest, destmtu);
1.340 ozaki-r 1504: percpu_putref(ipforward_rt_percpu);
1.44 thorpej 1505: }
1506:
1507: void
1.211 perry 1508: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1509: struct mbuf *m)
1.44 thorpej 1510: {
1.311 rmind 1511: struct socket *so = inp->inp_socket;
1.329 ozaki-r 1512: ifnet_t *ifp;
1.311 rmind 1513: int inpflags = inp->inp_flags;
1.329 ozaki-r 1514: struct psref psref;
1.44 thorpej 1515:
1.329 ozaki-r 1516: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 1517: if (__predict_false(ifp == NULL))
1518: return; /* XXX should report error? */
1519:
1.311 rmind 1520: if (so->so_options & SO_TIMESTAMP
1.278 christos 1521: #ifdef SO_OTIMESTAMP
1.311 rmind 1522: || so->so_options & SO_OTIMESTAMP
1.278 christos 1523: #endif
1524: ) {
1.44 thorpej 1525: struct timeval tv;
1526:
1527: microtime(&tv);
1.278 christos 1528: #ifdef SO_OTIMESTAMP
1.311 rmind 1529: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1530: struct timeval50 tv50;
1531: timeval_to_timeval50(&tv, &tv50);
1532: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1533: SCM_OTIMESTAMP, SOL_SOCKET);
1534: } else
1535: #endif
1.244 christos 1536: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1537: SCM_TIMESTAMP, SOL_SOCKET);
1538: if (*mp)
1539: mp = &(*mp)->m_next;
1540: }
1.311 rmind 1541: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1542: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1543: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1544: if (*mp)
1545: mp = &(*mp)->m_next;
1546: }
1.311 rmind 1547: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1548: struct in_pktinfo ipi;
1.307 christos 1549: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1550: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1551: *mp = sbcreatecontrol((void *) &ipi,
1552: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1553: if (*mp)
1554: mp = &(*mp)->m_next;
1555: }
1.311 rmind 1556: if (inpflags & INP_PKTINFO) {
1.306 christos 1557: struct in_pktinfo ipi;
1.307 christos 1558: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1559: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1560: *mp = sbcreatecontrol((void *) &ipi,
1561: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1562: if (*mp)
1563: mp = &(*mp)->m_next;
1564: }
1.311 rmind 1565: if (inpflags & INP_RECVIF) {
1.44 thorpej 1566: struct sockaddr_dl sdl;
1567:
1.337 ozaki-r 1568: sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
1569: NULL, 0);
1.251 dyoung 1570: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1571: if (*mp)
1572: mp = &(*mp)->m_next;
1573: }
1.311 rmind 1574: if (inpflags & INP_RECVTTL) {
1.282 minskim 1575: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1576: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1577: if (*mp)
1578: mp = &(*mp)->m_next;
1579: }
1.329 ozaki-r 1580: m_put_rcvif_psref(ifp, &psref);
1.13 mycroft 1581: }
1582:
1.189 atatat 1583: /*
1.228 elad 1584: * sysctl helper routine for net.inet.ip.forwsrcrt.
1585: */
1586: static int
1587: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1588: {
1589: int error, tmp;
1590: struct sysctlnode node;
1591:
1592: node = *rnode;
1593: tmp = ip_forwsrcrt;
1594: node.sysctl_data = &tmp;
1595: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1596: if (error || newp == NULL)
1597: return (error);
1598:
1.280 elad 1599: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1600: 0, NULL, NULL, NULL);
1601: if (error)
1602: return (error);
1.228 elad 1603:
1604: ip_forwsrcrt = tmp;
1605:
1606: return (0);
1607: }
1608:
1609: /*
1.189 atatat 1610: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1611: * range of the new value and tweaks timers if it changes.
1612: */
1613: static int
1614: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1615: {
1.189 atatat 1616: int error, tmp;
1617: struct sysctlnode node;
1618:
1.350 ozaki-r 1619: icmp_mtudisc_lock();
1620:
1.189 atatat 1621: node = *rnode;
1622: tmp = ip_mtudisc_timeout;
1623: node.sysctl_data = &tmp;
1624: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1625: if (error || newp == NULL)
1.350 ozaki-r 1626: goto out;
1627: if (tmp < 0) {
1628: error = EINVAL;
1629: goto out;
1630: }
1.273 matt 1631:
1.189 atatat 1632: ip_mtudisc_timeout = tmp;
1633: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350 ozaki-r 1634: error = 0;
1635: out:
1636: icmp_mtudisc_unlock();
1.351 ozaki-r 1637: return error;
1.189 atatat 1638: }
1.54 lukem 1639:
1.266 thorpej 1640: static int
1641: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1642: {
1643:
1.271 thorpej 1644: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1645: }
1.131 itojun 1646:
1.284 pooka 1647: static void
1648: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1649: {
1.197 atatat 1650: sysctl_createv(clog, 0, NULL, NULL,
1651: CTLFLAG_PERMANENT,
1.203 atatat 1652: CTLTYPE_NODE, "inet",
1653: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1654: NULL, 0, NULL, 0,
1655: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1656: sysctl_createv(clog, 0, NULL, NULL,
1657: CTLFLAG_PERMANENT,
1.203 atatat 1658: CTLTYPE_NODE, "ip",
1659: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1660: NULL, 0, NULL, 0,
1661: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1662:
1.197 atatat 1663: sysctl_createv(clog, 0, NULL, NULL,
1664: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1665: CTLTYPE_INT, "forwarding",
1666: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1667: NULL, 0, &ipforwarding, 0,
1668: CTL_NET, PF_INET, IPPROTO_IP,
1669: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1670: sysctl_createv(clog, 0, NULL, NULL,
1671: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1672: CTLTYPE_INT, "redirect",
1673: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1674: NULL, 0, &ipsendredirects, 0,
1675: CTL_NET, PF_INET, IPPROTO_IP,
1676: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1677: sysctl_createv(clog, 0, NULL, NULL,
1678: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1679: CTLTYPE_INT, "ttl",
1680: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1681: NULL, 0, &ip_defttl, 0,
1682: CTL_NET, PF_INET, IPPROTO_IP,
1683: IPCTL_DEFTTL, CTL_EOL);
1684: #ifdef IPCTL_DEFMTU
1.197 atatat 1685: sysctl_createv(clog, 0, NULL, NULL,
1686: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1687: CTLTYPE_INT, "mtu",
1688: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1689: NULL, 0, &ip_mtu, 0,
1690: CTL_NET, PF_INET, IPPROTO_IP,
1691: IPCTL_DEFMTU, CTL_EOL);
1692: #endif /* IPCTL_DEFMTU */
1.197 atatat 1693: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1694: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1695: CTLTYPE_INT, "forwsrcrt",
1696: SYSCTL_DESCR("Enable forwarding of source-routed "
1697: "datagrams"),
1.228 elad 1698: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1699: CTL_NET, PF_INET, IPPROTO_IP,
1700: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1701: sysctl_createv(clog, 0, NULL, NULL,
1702: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1703: CTLTYPE_INT, "directed-broadcast",
1704: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1705: NULL, 0, &ip_directedbcast, 0,
1706: CTL_NET, PF_INET, IPPROTO_IP,
1707: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1708: sysctl_createv(clog, 0, NULL, NULL,
1709: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1710: CTLTYPE_INT, "allowsrcrt",
1711: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1712: NULL, 0, &ip_allowsrcrt, 0,
1713: CTL_NET, PF_INET, IPPROTO_IP,
1714: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1715:
1.197 atatat 1716: sysctl_createv(clog, 0, NULL, NULL,
1717: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1718: CTLTYPE_INT, "mtudisc",
1719: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1720: NULL, 0, &ip_mtudisc, 0,
1721: CTL_NET, PF_INET, IPPROTO_IP,
1722: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1723: sysctl_createv(clog, 0, NULL, NULL,
1724: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1725: CTLTYPE_INT, "anonportmin",
1726: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1727: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1728: CTL_NET, PF_INET, IPPROTO_IP,
1729: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1730: sysctl_createv(clog, 0, NULL, NULL,
1731: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1732: CTLTYPE_INT, "anonportmax",
1733: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1734: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1735: CTL_NET, PF_INET, IPPROTO_IP,
1736: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1737: sysctl_createv(clog, 0, NULL, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1739: CTLTYPE_INT, "mtudisctimeout",
1740: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1741: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1742: CTL_NET, PF_INET, IPPROTO_IP,
1743: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1744: #ifndef IPNOPRIVPORTS
1.197 atatat 1745: sysctl_createv(clog, 0, NULL, NULL,
1746: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1747: CTLTYPE_INT, "lowportmin",
1748: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1749: "to assign"),
1.189 atatat 1750: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1751: CTL_NET, PF_INET, IPPROTO_IP,
1752: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1753: sysctl_createv(clog, 0, NULL, NULL,
1754: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1755: CTLTYPE_INT, "lowportmax",
1756: SYSCTL_DESCR("Highest privileged ephemeral port number "
1757: "to assign"),
1.189 atatat 1758: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1759: CTL_NET, PF_INET, IPPROTO_IP,
1760: IPCTL_LOWPORTMAX, CTL_EOL);
1761: #endif /* IPNOPRIVPORTS */
1762: #if NGRE > 0
1.197 atatat 1763: sysctl_createv(clog, 0, NULL, NULL,
1764: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1765: CTLTYPE_INT, "grettl",
1766: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1767: NULL, 0, &ip_gre_ttl, 0,
1768: CTL_NET, PF_INET, IPPROTO_IP,
1769: IPCTL_GRE_TTL, CTL_EOL);
1770: #endif /* NGRE */
1.197 atatat 1771: sysctl_createv(clog, 0, NULL, NULL,
1772: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1773: CTLTYPE_INT, "checkinterface",
1774: SYSCTL_DESCR("Enable receive side of Strong ES model "
1775: "from RFC1122"),
1.189 atatat 1776: NULL, 0, &ip_checkinterface, 0,
1777: CTL_NET, PF_INET, IPPROTO_IP,
1778: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1779: sysctl_createv(clog, 0, NULL, NULL,
1780: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1781: CTLTYPE_INT, "random_id",
1782: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1783: NULL, 0, &ip_do_randomid, 0,
1784: CTL_NET, PF_INET, IPPROTO_IP,
1785: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1786: sysctl_createv(clog, 0, NULL, NULL,
1787: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1788: CTLTYPE_INT, "do_loopback_cksum",
1789: SYSCTL_DESCR("Perform IP checksum on loopback"),
1790: NULL, 0, &ip_do_loopback_cksum, 0,
1791: CTL_NET, PF_INET, IPPROTO_IP,
1792: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1793: sysctl_createv(clog, 0, NULL, NULL,
1794: CTLFLAG_PERMANENT,
1795: CTLTYPE_STRUCT, "stats",
1796: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1797: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1798: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1799: CTL_EOL);
1.322 joerg 1800: #if NARP
1.321 roy 1801: sysctl_createv(clog, 0, NULL, NULL,
1802: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1803: CTLTYPE_INT, "dad_count",
1804: SYSCTL_DESCR("Number of Duplicate Address Detection "
1805: "probes to send"),
1806: NULL, 0, &ip_dad_count, 0,
1807: CTL_NET, PF_INET, IPPROTO_IP,
1808: IPCTL_DAD_COUNT, CTL_EOL);
1.322 joerg 1809: #endif
1.301 christos 1810:
1811: /* anonportalgo RFC6056 subtree */
1.302 christos 1812: const struct sysctlnode *portalgo_node;
1813: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1814: CTLFLAG_PERMANENT,
1815: CTLTYPE_NODE, "anonportalgo",
1816: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1817: NULL, 0, NULL, 0,
1818: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1819: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1820: CTLFLAG_PERMANENT,
1821: CTLTYPE_STRING, "available",
1822: SYSCTL_DESCR("available algorithms"),
1.302 christos 1823: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1824: CTL_CREATE, CTL_EOL);
1.302 christos 1825: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1826: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1827: CTLTYPE_STRING, "selected",
1828: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1829: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1830: CTL_CREATE, CTL_EOL);
1831: sysctl_createv(clog, 0, &portalgo_node, NULL,
1832: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1833: CTLTYPE_STRUCT, "reserve",
1834: SYSCTL_DESCR("bitmap of reserved ports"),
1835: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1836: CTL_CREATE, CTL_EOL);
1.1 cgd 1837: }
1.266 thorpej 1838:
1839: void
1840: ip_statinc(u_int stat)
1841: {
1842:
1843: KASSERT(stat < IP_NSTATS);
1844: IP_STATINC(stat);
1845: }
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