Annotation of src/sys/netinet/ip_input.c, Revision 1.344
1.344 ! ozaki-r 1: /* $NetBSD: ip_input.c,v 1.343 2016/10/18 01:15:20 ozaki-r 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>
1.344 ! ozaki-r 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.343 2016/10/18 01:15:20 ozaki-r 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
1.47 cjs 165: #define IPFORWSRCRT 1 /* forward source-routed packets */
166: #endif
167: #ifndef IPALLOWSRCRT
1.48 mrg 168: #define IPALLOWSRCRT 1 /* 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: /*
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: */
1.311 rmind 262:
263: static int ip_nhops = 0;
264:
1.1 cgd 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:
1.295 dyoung 272: static int ip_drainwanted;
273:
1.318 rmind 274: struct sockaddr_in ipaddr = {
275: .sin_len = sizeof(ipaddr),
276: .sin_family = AF_INET,
277: };
278:
1.210 perry 279: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 280:
1.164 matt 281: #ifdef MBUFTRACE
1.234 dogcow 282: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
283: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 284: #endif
285:
1.318 rmind 286: static void ipintr(void *);
1.312 rmind 287: static void ip_input(struct mbuf *);
1.329 ozaki-r 288: static void ip_forward(struct mbuf *, int, struct ifnet *);
1.311 rmind 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 **);
1.284 pooka 292:
1.333 ozaki-r 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:
1.344 ! ozaki-r 298: #ifdef NET_MPSAFE
! 299: #define SOFTNET_LOCK() mutex_enter(softnet_lock)
! 300: #define SOFTNET_UNLOCK() mutex_exit(softnet_lock)
! 301: #else
1.318 rmind 302: #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
303: #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
1.344 ! ozaki-r 304: #endif
1.318 rmind 305:
1.1 cgd 306: /*
307: * IP initialization: fill in IP protocol switch table.
308: * All protocols not implemented in kernel go to raw IP protocol handler.
309: */
1.8 mycroft 310: void
1.211 perry 311: ip_init(void)
1.1 cgd 312: {
1.199 matt 313: const struct protosw *pr;
1.1 cgd 314:
1.311 rmind 315: in_init();
1.284 pooka 316: sysctl_net_inet_ip_setup(NULL);
317:
1.311 rmind 318: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
319: KASSERT(pr != NULL);
1.275 pooka 320:
1.319 ozaki-r 321: ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318 rmind 322: KASSERT(ip_pktq != NULL);
323:
1.328 riastrad 324: for (u_int i = 0; i < IPPROTO_MAX; i++) {
325: ip_protox[i] = pr - inetsw;
1.311 rmind 326: }
1.328 riastrad 327: for (pr = inetdomain.dom_protosw;
328: pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1 cgd 329: if (pr->pr_domain->dom_family == PF_INET &&
330: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328 riastrad 331: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 332:
1.288 rmind 333: ip_reass_init();
1.190 jonathan 334:
1.291 rmind 335: ip_ids = ip_id_init();
1.323 ozaki-r 336: ip_id = time_uptime & 0xfffff;
1.194 jonathan 337:
1.160 itojun 338: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 339: #ifdef GATEWAY
1.311 rmind 340: ipflow_init();
1.73 thorpej 341: #endif
1.121 thorpej 342:
343: /* Register our Packet Filter hook. */
1.308 rmind 344: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
345: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 346:
1.164 matt 347: #ifdef MBUFTRACE
348: MOWNER_ATTACH(&ip_tx_mowner);
349: MOWNER_ATTACH(&ip_rx_mowner);
350: #endif /* MBUFTRACE */
1.266 thorpej 351:
352: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340 ozaki-r 353:
354: ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
355: if (ipforward_rt_percpu == NULL)
356: panic("failed to allocate ipforward_rt_percpu");
1.1 cgd 357: }
358:
1.333 ozaki-r 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:
1.334 ozaki-r 384: IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333 ozaki-r 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;
1.341 roy 390: if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
391: (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333 ozaki-r 392: break;
393: else
1.338 ozaki-r 394: (*downmatch)++;
1.333 ozaki-r 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:
1.336 ozaki-r 407: IFADDR_READER_FOREACH(ifa, ifp) {
1.333 ozaki-r 408: if (ifa->ifa_addr->sa_family != AF_INET)
409: continue;
410: ia = ifatoia(ifa);
1.341 roy 411: if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333 ozaki-r 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:
1.1 cgd 435: /*
1.318 rmind 436: * IP software interrupt routine.
1.89 itojun 437: */
1.318 rmind 438: static void
439: ipintr(void *arg __unused)
1.89 itojun 440: {
441: struct mbuf *m;
1.286 tls 442:
1.318 rmind 443: KASSERT(cpu_softintr_p());
1.89 itojun 444:
1.344 ! ozaki-r 445: #ifndef NET_MPSAFE
1.268 ad 446: mutex_enter(softnet_lock);
1.344 ! ozaki-r 447: #endif
1.318 rmind 448: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 449: ip_input(m);
450: }
1.344 ! ozaki-r 451: #ifndef NET_MPSAFE
1.268 ad 452: mutex_exit(softnet_lock);
1.344 ! ozaki-r 453: #endif
1.89 itojun 454: }
455:
456: /*
1.318 rmind 457: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 458: * try to reassemble. Process options. Pass to next level.
459: */
1.312 rmind 460: static void
1.89 itojun 461: ip_input(struct mbuf *m)
1.1 cgd 462: {
1.109 augustss 463: struct ip *ip = NULL;
1.339 ozaki-r 464: struct in_ifaddr *ia = NULL;
1.288 rmind 465: int hlen = 0, len;
1.100 itojun 466: int downmatch;
1.169 itojun 467: int srcrt = 0;
1.314 rmind 468: ifnet_t *ifp;
1.329 ozaki-r 469: struct psref psref;
1.339 ozaki-r 470: int s;
1.1 cgd 471:
1.318 rmind 472: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
473: "interrupt handler; synchronization assumptions violated");
474:
1.164 matt 475: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 476: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329 ozaki-r 477:
478: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 479: if (__predict_false(ifp == NULL))
1.332 ozaki-r 480: goto out;
1.164 matt 481:
1.1 cgd 482: /*
483: * If no IP addresses have been set yet but the interfaces
484: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 485: * Note: we pre-check without locks held.
1.1 cgd 486: */
1.335 ozaki-r 487: if (IN_ADDRLIST_READER_EMPTY())
1.332 ozaki-r 488: goto out;
1.266 thorpej 489: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 490:
1.154 thorpej 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: */
1.244 christos 497: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 498: if ((m = m_copyup(m, sizeof(struct ip),
499: (max_linkhdr + 3) & ~3)) == NULL) {
500: /* XXXJRT new stat, please */
1.266 thorpej 501: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 502: goto out;
1.154 thorpej 503: }
504: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
505: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 506: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 507: goto out;
1.154 thorpej 508: }
1.1 cgd 509: }
510: ip = mtod(m, struct ip *);
1.13 mycroft 511: if (ip->ip_v != IPVERSION) {
1.266 thorpej 512: IP_STATINC(IP_STAT_BADVERS);
1.332 ozaki-r 513: goto out;
1.13 mycroft 514: }
1.1 cgd 515: hlen = ip->ip_hl << 2;
516: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 517: IP_STATINC(IP_STAT_BADHLEN);
1.332 ozaki-r 518: goto out;
1.1 cgd 519: }
520: if (hlen > m->m_len) {
1.298 liamjfoy 521: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 522: IP_STATINC(IP_STAT_BADHLEN);
1.329 ozaki-r 523: goto out;
1.1 cgd 524: }
525: ip = mtod(m, struct ip *);
526: }
1.98 thorpej 527:
1.85 hwr 528: /*
1.99 thorpej 529: * RFC1122: packets with a multicast source address are
1.98 thorpej 530: * not allowed.
1.85 hwr 531: */
532: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 533: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 534: goto out;
1.129 itojun 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) {
1.314 rmind 540: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 541: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 542: goto out;
1.130 itojun 543: }
1.85 hwr 544: }
545:
1.135 thorpej 546: switch (m->m_pkthdr.csum_flags &
1.314 rmind 547: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 548: M_CSUM_IPv4_BAD)) {
549: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
550: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332 ozaki-r 551: IP_STATINC(IP_STAT_BADSUM);
552: goto out;
1.135 thorpej 553:
554: case M_CSUM_IPv4:
555: /* Checksum was okay. */
556: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
557: break;
558:
559: default:
1.206 thorpej 560: /*
561: * Must compute it ourselves. Maybe skip checksum on
562: * loopback interfaces.
563: */
1.314 rmind 564: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
565: ip_do_loopback_cksum)) {
1.206 thorpej 566: INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332 ozaki-r 567: if (in_cksum(m, hlen) != 0) {
568: IP_STATINC(IP_STAT_BADSUM);
569: goto out;
570: }
1.206 thorpej 571: }
1.135 thorpej 572: break;
1.1 cgd 573: }
574:
1.121 thorpej 575: /* Retrieve the packet length. */
576: len = ntohs(ip->ip_len);
1.81 proff 577:
578: /*
579: * Check for additional length bogosity
580: */
1.84 proff 581: if (len < hlen) {
1.266 thorpej 582: IP_STATINC(IP_STAT_BADLEN);
1.332 ozaki-r 583: goto out;
1.81 proff 584: }
1.1 cgd 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: */
1.35 mycroft 592: if (m->m_pkthdr.len < len) {
1.266 thorpej 593: IP_STATINC(IP_STAT_TOOSHORT);
1.332 ozaki-r 594: goto out;
1.1 cgd 595: }
1.35 mycroft 596: if (m->m_pkthdr.len > len) {
1.1 cgd 597: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 598: m->m_len = len;
599: m->m_pkthdr.len = len;
1.1 cgd 600: } else
1.35 mycroft 601: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 602: }
603:
1.64 thorpej 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:
1.33 mrg 610: /*
1.64 thorpej 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.
1.33 mrg 616: */
1.304 christos 617: #if defined(IPSEC)
1.317 christos 618: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 619: #else
620: if (1)
621: #endif
622: {
1.314 rmind 623: struct in_addr odst = ip->ip_dst;
1.318 rmind 624: bool freed;
1.169 itojun 625:
1.318 rmind 626: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
627: if (freed || m == NULL) {
1.343 ozaki-r 628: m = NULL;
1.329 ozaki-r 629: goto out;
1.318 rmind 630: }
1.127 itojun 631: ip = mtod(m, struct ip *);
1.142 darrenr 632: hlen = ip->ip_hl << 2;
1.318 rmind 633:
1.205 darrenr 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.
1.212 perry 646: * should be supported in this manner...
1.205 darrenr 647: */
1.169 itojun 648: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 649: }
1.123 thorpej 650:
651: #ifdef ALTQ
652: /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318 rmind 653: if (altq_input) {
654: SOFTNET_LOCK();
655: if ((*altq_input)(m, AF_INET) == 0) {
656: /* Packet dropped by traffic conditioner. */
657: SOFTNET_UNLOCK();
1.343 ozaki-r 658: m = NULL;
1.329 ozaki-r 659: goto out;
1.318 rmind 660: }
661: SOFTNET_UNLOCK();
1.123 thorpej 662: }
663: #endif
1.121 thorpej 664:
665: /*
1.1 cgd 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 */
1.343 ozaki-r 672: if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
673: m = NULL;
1.329 ozaki-r 674: goto out;
1.343 ozaki-r 675: }
1.1 cgd 676:
677: /*
678: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 679: *
680: * Traditional 4.4BSD did not consult IFF_UP at all.
681: * The behavior here is to treat addresses on !IFF_UP interface
1.321 roy 682: * or IN_IFF_NOTREADY addresses as not mine.
1.1 cgd 683: */
1.100 itojun 684: downmatch = 0;
1.339 ozaki-r 685: s = pserialize_read_enter();
1.333 ozaki-r 686: ia = ip_match_our_address(ifp, ip, &downmatch);
1.339 ozaki-r 687: if (ia != NULL) {
688: pserialize_read_exit(s);
1.86 thorpej 689: goto ours;
1.339 ozaki-r 690: }
1.333 ozaki-r 691:
1.315 christos 692: if (ifp->if_flags & IFF_BROADCAST) {
1.333 ozaki-r 693: ia = ip_match_our_address_broadcast(ifp, ip);
1.339 ozaki-r 694: if (ia != NULL) {
695: pserialize_read_exit(s);
1.333 ozaki-r 696: goto ours;
1.339 ozaki-r 697: }
1.1 cgd 698: }
1.339 ozaki-r 699: pserialize_read_exit(s);
1.333 ozaki-r 700:
1.18 mycroft 701: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 702: #ifdef MROUTING
703: extern struct socket *ip_mrouter;
1.10 brezak 704:
1.4 hpeyerl 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: */
1.318 rmind 718: SOFTNET_LOCK();
1.314 rmind 719: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 720: SOFTNET_UNLOCK();
1.266 thorpej 721: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 722: goto out;
1.4 hpeyerl 723: }
1.318 rmind 724: SOFTNET_UNLOCK();
1.4 hpeyerl 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: */
1.318 rmind 731: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 732: goto ours;
1.318 rmind 733: }
1.266 thorpej 734: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 735: }
736: #endif
737: /*
738: * See if we belong to the destination multicast group on the
739: * arrival interface.
740: */
1.316 rmind 741: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 742: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 743: goto out;
1.4 hpeyerl 744: }
745: goto ours;
746: }
1.19 mycroft 747: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 748: in_nullhost(ip->ip_dst))
1.1 cgd 749: goto ours;
750:
751: /*
752: * Not for us; forward if possible and desirable.
753: */
754: if (ipforwarding == 0) {
1.329 ozaki-r 755: m_put_rcvif_psref(ifp, &psref);
1.266 thorpej 756: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 757: m_freem(m);
1.100 itojun 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) {
1.329 ozaki-r 766: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 767: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 768: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 769: return;
770: }
1.304 christos 771: #ifdef IPSEC
1.305 rmind 772: /* Perform IPsec, if any. */
1.318 rmind 773: if (ipsec_used) {
774: SOFTNET_LOCK();
775: if (ipsec4_input(m, IP_FORWARDING |
776: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
777: SOFTNET_UNLOCK();
1.332 ozaki-r 778: goto out;
1.318 rmind 779: }
780: SOFTNET_UNLOCK();
1.173 jonathan 781: }
1.305 rmind 782: #endif
1.329 ozaki-r 783: ip_forward(m, srcrt, ifp);
784: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 785: }
1.89 itojun 786: return;
1.1 cgd 787:
788: ours:
1.329 ozaki-r 789: m_put_rcvif_psref(ifp, &psref);
1.331 ozaki-r 790: ifp = NULL;
1.329 ozaki-r 791:
1.1 cgd 792: /*
793: * If offset or IP_MF are set, must reassemble.
794: */
1.155 itojun 795: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 796: /*
797: * Pass to IP reassembly mechanism.
798: */
1.290 rmind 799: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 800: /* Failed; invalid fragment(s) or packet. */
1.332 ozaki-r 801: goto out;
1.16 cgd 802: }
1.290 rmind 803: if (m == NULL) {
1.289 rmind 804: /* More fragments should come; silently return. */
1.332 ozaki-r 805: goto out;
1.289 rmind 806: }
1.290 rmind 807: /*
808: * Reassembly is done, we have the final packet.
809: * Updated cached data in local variable(s).
810: */
1.289 rmind 811: ip = mtod(m, struct ip *);
812: hlen = ip->ip_hl << 2;
1.79 mycroft 813: }
1.128 itojun 814:
1.304 christos 815: #ifdef IPSEC
1.173 jonathan 816: /*
1.305 rmind 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.
1.173 jonathan 820: */
1.317 christos 821: if (ipsec_used &&
1.328 riastrad 822: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318 rmind 823: SOFTNET_LOCK();
1.305 rmind 824: if (ipsec4_input(m, 0) != 0) {
1.318 rmind 825: SOFTNET_UNLOCK();
1.332 ozaki-r 826: goto out;
1.173 jonathan 827: }
1.318 rmind 828: SOFTNET_UNLOCK();
1.173 jonathan 829: }
1.305 rmind 830: #endif
1.1 cgd 831:
832: /*
833: * Switch out to protocol's input routine.
834: */
1.82 aidan 835: #if IFA_STATS
1.339 ozaki-r 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();
1.342 ozaki-r 843: _ia = in_get_ia(ip->ip_dst);
1.339 ozaki-r 844: _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
845: pserialize_read_exit(s);
846: }
1.82 aidan 847: #endif
1.266 thorpej 848: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 849:
1.318 rmind 850: const int off = hlen, nh = ip->ip_p;
851:
852: SOFTNET_LOCK();
1.328 riastrad 853: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318 rmind 854: SOFTNET_UNLOCK();
1.89 itojun 855: return;
1.135 thorpej 856:
1.329 ozaki-r 857: out:
858: m_put_rcvif_psref(ifp, &psref);
1.332 ozaki-r 859: if (m != NULL)
860: m_freem(m);
1.1 cgd 861: }
862:
863: /*
1.288 rmind 864: * IP timer processing.
1.1 cgd 865: */
1.8 mycroft 866: void
1.211 perry 867: ip_slowtimo(void)
1.1 cgd 868: {
1.268 ad 869:
870: mutex_enter(softnet_lock);
871: KERNEL_LOCK(1, NULL);
1.1 cgd 872:
1.288 rmind 873: ip_reass_slowtimo();
1.268 ad 874:
875: KERNEL_UNLOCK_ONE(NULL);
876: mutex_exit(softnet_lock);
1.1 cgd 877: }
878:
879: /*
1.288 rmind 880: * IP drain processing.
1.1 cgd 881: */
1.8 mycroft 882: void
1.211 perry 883: ip_drain(void)
1.1 cgd 884: {
885:
1.268 ad 886: KERNEL_LOCK(1, NULL);
1.288 rmind 887: ip_reass_drain();
1.268 ad 888: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 889: }
890:
891: /*
1.311 rmind 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.
1.1 cgd 897: */
1.311 rmind 898: static bool
1.211 perry 899: ip_dooptions(struct mbuf *m)
1.1 cgd 900: {
1.109 augustss 901: struct ip *ip = mtod(m, struct ip *);
902: u_char *cp, *cp0;
903: struct ip_timestamp *ipt;
904: struct in_ifaddr *ia;
1.1 cgd 905: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 906: struct in_addr dst;
1.1 cgd 907: n_time ntime;
1.339 ozaki-r 908: struct ifaddr *ifa;
909: int s;
1.1 cgd 910:
1.13 mycroft 911: dst = ip->ip_dst;
1.1 cgd 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 {
1.113 itojun 921: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
922: code = &cp[IPOPT_OLEN] - (u_char *)ip;
923: goto bad;
924: }
1.1 cgd 925: optlen = cp[IPOPT_OLEN];
1.114 itojun 926: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 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:
1.47 cjs 947: if (ip_allowsrcrt == 0) {
948: type = ICMP_UNREACH;
949: code = ICMP_UNREACH_NET_PROHIB;
950: goto bad;
951: }
1.114 itojun 952: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
953: code = &cp[IPOPT_OLEN] - (u_char *)ip;
954: goto bad;
955: }
1.1 cgd 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;
1.339 ozaki-r 961:
962: s = pserialize_read_enter();
963: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
964: if (ifa == NULL) {
965: pserialize_read_exit(s);
1.1 cgd 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: }
1.339 ozaki-r 977: pserialize_read_exit(s);
978:
1.1 cgd 979: off--; /* 0 origin */
1.112 sommerfe 980: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 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: */
1.281 tsutsui 990: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 991: sizeof(ipaddr.sin_addr));
1.339 ozaki-r 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 {
1.1 cgd 1000: ia = ip_rtaddr(ipaddr.sin_addr);
1.339 ozaki-r 1001: }
1002: if (ia == NULL) {
1.1 cgd 1003: type = ICMP_UNREACH;
1004: code = ICMP_UNREACH_SRCFAIL;
1.339 ozaki-r 1005: pserialize_read_exit(s);
1.1 cgd 1006: goto bad;
1007: }
1008: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1009: bcopy((void *)&ia->ia_addr.sin_addr,
1010: (void *)(cp + off), sizeof(struct in_addr));
1.339 ozaki-r 1011: pserialize_read_exit(s);
1.1 cgd 1012: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1013: /*
1014: * Let ip_intr's mcast routing check handle mcast pkts
1015: */
1.18 mycroft 1016: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1017: break;
1018:
1019: case IPOPT_RR:
1.114 itojun 1020: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1021: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1022: goto bad;
1023: }
1.1 cgd 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 */
1.112 sommerfe 1032: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1033: break;
1.281 tsutsui 1034: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1035: sizeof(ipaddr.sin_addr));
1036: /*
1037: * locate outgoing interface; if we're the destination,
1038: * use the incoming interface (should be same).
1039: */
1.339 ozaki-r 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);
1.1 cgd 1052: }
1.244 christos 1053: bcopy((void *)&ia->ia_addr.sin_addr,
1054: (void *)(cp + off), sizeof(struct in_addr));
1.339 ozaki-r 1055: pserialize_read_exit(s);
1.1 cgd 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;
1.114 itojun 1062: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1063: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1064: goto bad;
1.114 itojun 1065: }
1066: if (ipt->ipt_ptr < 5) {
1067: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1068: goto bad;
1069: }
1.15 cgd 1070: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1071: if (++ipt->ipt_oflw == 0) {
1072: code = (u_char *)&ipt->ipt_ptr -
1073: (u_char *)ip;
1.1 cgd 1074: goto bad;
1.114 itojun 1075: }
1.1 cgd 1076: break;
1077: }
1.104 thorpej 1078: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1079: switch (ipt->ipt_flg) {
1080:
1081: case IPOPT_TS_TSONLY:
1082: break;
1083:
1.329 ozaki-r 1084: case IPOPT_TS_TSANDADDR: {
1085: struct ifnet *rcvif;
1.339 ozaki-r 1086: int _s, _ss;
1.329 ozaki-r 1087:
1.66 thorpej 1088: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1089: sizeof(struct in_addr) > ipt->ipt_len) {
1090: code = (u_char *)&ipt->ipt_ptr -
1091: (u_char *)ip;
1.1 cgd 1092: goto bad;
1.114 itojun 1093: }
1.13 mycroft 1094: ipaddr.sin_addr = dst;
1.339 ozaki-r 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);
1.104 thorpej 1104: bcopy(&ia->ia_addr.sin_addr,
1105: cp0, sizeof(struct in_addr));
1.339 ozaki-r 1106: pserialize_read_exit(_ss);
1.1 cgd 1107: ipt->ipt_ptr += sizeof(struct in_addr);
1108: break;
1.329 ozaki-r 1109: }
1.1 cgd 1110:
1111: case IPOPT_TS_PRESPEC:
1.66 thorpej 1112: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1113: sizeof(struct in_addr) > ipt->ipt_len) {
1114: code = (u_char *)&ipt->ipt_ptr -
1115: (u_char *)ip;
1.1 cgd 1116: goto bad;
1.114 itojun 1117: }
1.281 tsutsui 1118: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1119: sizeof(struct in_addr));
1.339 ozaki-r 1120: s = pserialize_read_enter();
1121: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
1122: if (ifa == NULL) {
1123: pserialize_read_exit(s);
1.1 cgd 1124: continue;
1.339 ozaki-r 1125: }
1126: pserialize_read_exit(s);
1.1 cgd 1127: ipt->ipt_ptr += sizeof(struct in_addr);
1128: break;
1129:
1130: default:
1.114 itojun 1131: /* XXX can't take &ipt->ipt_flg */
1132: code = (u_char *)&ipt->ipt_ptr -
1133: (u_char *)ip + 1;
1.1 cgd 1134: goto bad;
1135: }
1136: ntime = iptime();
1.107 thorpej 1137: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1138: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1139: sizeof(n_time));
1140: ipt->ipt_ptr += sizeof(n_time);
1141: }
1142: }
1143: if (forward) {
1.329 ozaki-r 1144: struct ifnet *rcvif;
1.339 ozaki-r 1145: struct psref _psref;
1.329 ozaki-r 1146:
1.26 thorpej 1147: if (ip_forwsrcrt == 0) {
1148: type = ICMP_UNREACH;
1149: code = ICMP_UNREACH_SRCFAIL;
1150: goto bad;
1151: }
1.329 ozaki-r 1152:
1.339 ozaki-r 1153: rcvif = m_get_rcvif_psref(m, &_psref);
1.330 ozaki-r 1154: if (__predict_false(rcvif == NULL)) {
1155: type = ICMP_UNREACH;
1156: code = ICMP_UNREACH_HOST;
1157: goto bad;
1158: }
1.329 ozaki-r 1159: ip_forward(m, 1, rcvif);
1.339 ozaki-r 1160: m_put_rcvif_psref(rcvif, &_psref);
1.311 rmind 1161: return true;
1.13 mycroft 1162: }
1.311 rmind 1163: return false;
1.1 cgd 1164: bad:
1.13 mycroft 1165: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1166: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1167: return true;
1.1 cgd 1168: }
1169:
1170: /*
1.311 rmind 1171: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1172: * return internet address info of interface to be used to get there.
1173: */
1.311 rmind 1174: static struct in_ifaddr *
1.211 perry 1175: ip_rtaddr(struct in_addr dst)
1.1 cgd 1176: {
1.249 dyoung 1177: struct rtentry *rt;
1178: union {
1179: struct sockaddr dst;
1180: struct sockaddr_in dst4;
1181: } u;
1.340 ozaki-r 1182: struct route *ro;
1.249 dyoung 1183:
1184: sockaddr_in_init(&u.dst4, &dst, 0);
1185:
1.318 rmind 1186: SOFTNET_LOCK();
1.340 ozaki-r 1187: ro = percpu_getref(ipforward_rt_percpu);
1188: rt = rtcache_lookup(ro, &u.dst);
1189: percpu_putref(ipforward_rt_percpu);
1.318 rmind 1190: SOFTNET_UNLOCK();
1191: if (rt == NULL)
1.249 dyoung 1192: return NULL;
1193:
1194: return ifatoia(rt->rt_ifa);
1.1 cgd 1195: }
1196:
1197: /*
1.311 rmind 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.
1.1 cgd 1200: */
1.311 rmind 1201: static void
1.211 perry 1202: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1203: {
1204: unsigned olen;
1205:
1206: olen = option[IPOPT_OLEN];
1207: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1208: return;
1.281 tsutsui 1209: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 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 *
1.211 perry 1220: ip_srcroute(void)
1.1 cgd 1221: {
1.109 augustss 1222: struct in_addr *p, *q;
1223: struct mbuf *m;
1.1 cgd 1224:
1225: if (ip_nhops == 0)
1.237 dyoung 1226: return NULL;
1.1 cgd 1227: m = m_get(M_DONTWAIT, MT_SOOPTS);
1228: if (m == 0)
1.237 dyoung 1229: return NULL;
1.1 cgd 1230:
1.164 matt 1231: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1232: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 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;
1.244 christos 1249: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1250: OPTSIZ);
1251: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 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:
1.139 matt 1268: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 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,
1.1 cgd 1278: };
1279:
1.295 dyoung 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:
1.1 cgd 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: */
1.313 rmind 1309: static void
1.329 ozaki-r 1310: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1 cgd 1311: {
1.109 augustss 1312: struct ip *ip = mtod(m, struct ip *);
1313: struct rtentry *rt;
1.220 christos 1314: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1315: struct mbuf *mcopy;
1.13 mycroft 1316: n_long dest;
1.249 dyoung 1317: union {
1318: struct sockaddr dst;
1319: struct sockaddr_in dst4;
1320: } u;
1.320 ozaki-r 1321: uint64_t *ips;
1.340 ozaki-r 1322: struct route *ro;
1.164 matt 1323:
1.318 rmind 1324: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1325: "interrupt handler; synchronization assumptions violated");
1326:
1.164 matt 1327: /*
1328: * We are now in the output path.
1329: */
1330: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1331:
1332: /*
1333: * Clear any in-bound checksum flags for this packet.
1334: */
1335: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1336:
1.13 mycroft 1337: dest = 0;
1.93 sommerfe 1338: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1339: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1340: m_freem(m);
1341: return;
1342: }
1.318 rmind 1343:
1.1 cgd 1344: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1345: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1346: return;
1347: }
1348:
1.249 dyoung 1349: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1350:
1.340 ozaki-r 1351: ro = percpu_getref(ipforward_rt_percpu);
1352: if ((rt = rtcache_lookup(ro, &u.dst)) == NULL) {
1353: percpu_putref(ipforward_rt_percpu);
1.249 dyoung 1354: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1355: return;
1.1 cgd 1356: }
1357:
1358: /*
1.34 mycroft 1359: * Save at most 68 bytes of the packet in case
1.1 cgd 1360: * we need to generate an ICMP message to the src.
1.119 itojun 1361: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1362: */
1.155 itojun 1363: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1364: if (mcopy)
1365: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1366:
1.221 christos 1367: ip->ip_ttl -= IPTTLDEC;
1368:
1.1 cgd 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: */
1.329 ozaki-r 1377: if (rt->rt_ifp == rcvif &&
1.1 cgd 1378: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1379: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1380: ipsendredirects && !srcrt) {
1.19 mycroft 1381: if (rt->rt_ifa &&
1382: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1383: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 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;
1.1 cgd 1394: }
1395: }
1396:
1.340 ozaki-r 1397: error = ip_output(m, NULL, ro,
1.173 jonathan 1398: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1399: NULL, NULL);
1.173 jonathan 1400:
1.320 ozaki-r 1401: if (error) {
1.266 thorpej 1402: IP_STATINC(IP_STAT_CANTFORWARD);
1.320 ozaki-r 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) {
1.63 matt 1417: #ifdef GATEWAY
1.320 ozaki-r 1418: if (mcopy->m_flags & M_CANFASTFWD)
1.340 ozaki-r 1419: ipflow_create(ro, mcopy);
1.63 matt 1420: #endif
1.320 ozaki-r 1421: m_freem(mcopy);
1.1 cgd 1422: }
1.320 ozaki-r 1423:
1.340 ozaki-r 1424: percpu_putref(ipforward_rt_percpu);
1.320 ozaki-r 1425: return;
1426:
1427: redirect:
1428: error:
1.318 rmind 1429: if (mcopy == NULL) {
1.340 ozaki-r 1430: percpu_putref(ipforward_rt_percpu);
1.1 cgd 1431: return;
1.318 rmind 1432: }
1.13 mycroft 1433:
1.1 cgd 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;
1.263 cube 1452:
1.340 ozaki-r 1453: if ((rt = rtcache_validate(ro)) != NULL)
1.274 seanb 1454: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1455: #ifdef IPSEC
1.317 christos 1456: if (ipsec_used)
1457: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1458: #endif
1.266 thorpej 1459: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1460: break;
1461:
1462: case ENOBUFS:
1.143 itojun 1463: /*
1.311 rmind 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.
1.143 itojun 1468: */
1469: if (mcopy)
1470: m_freem(mcopy);
1.340 ozaki-r 1471: percpu_putref(ipforward_rt_percpu);
1.143 itojun 1472: return;
1.1 cgd 1473: }
1.220 christos 1474: icmp_error(mcopy, type, code, dest, destmtu);
1.340 ozaki-r 1475: percpu_putref(ipforward_rt_percpu);
1.44 thorpej 1476: }
1477:
1478: void
1.211 perry 1479: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1480: struct mbuf *m)
1.44 thorpej 1481: {
1.311 rmind 1482: struct socket *so = inp->inp_socket;
1.329 ozaki-r 1483: ifnet_t *ifp;
1.311 rmind 1484: int inpflags = inp->inp_flags;
1.329 ozaki-r 1485: struct psref psref;
1.44 thorpej 1486:
1.329 ozaki-r 1487: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 1488: if (__predict_false(ifp == NULL))
1489: return; /* XXX should report error? */
1490:
1.311 rmind 1491: if (so->so_options & SO_TIMESTAMP
1.278 christos 1492: #ifdef SO_OTIMESTAMP
1.311 rmind 1493: || so->so_options & SO_OTIMESTAMP
1.278 christos 1494: #endif
1495: ) {
1.44 thorpej 1496: struct timeval tv;
1497:
1498: microtime(&tv);
1.278 christos 1499: #ifdef SO_OTIMESTAMP
1.311 rmind 1500: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 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
1.244 christos 1507: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1508: SCM_TIMESTAMP, SOL_SOCKET);
1509: if (*mp)
1510: mp = &(*mp)->m_next;
1511: }
1.311 rmind 1512: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1513: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1514: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1515: if (*mp)
1516: mp = &(*mp)->m_next;
1517: }
1.311 rmind 1518: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1519: struct in_pktinfo ipi;
1.307 christos 1520: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1521: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1522: *mp = sbcreatecontrol((void *) &ipi,
1523: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1524: if (*mp)
1525: mp = &(*mp)->m_next;
1526: }
1.311 rmind 1527: if (inpflags & INP_PKTINFO) {
1.306 christos 1528: struct in_pktinfo ipi;
1.307 christos 1529: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1530: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1531: *mp = sbcreatecontrol((void *) &ipi,
1532: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1533: if (*mp)
1534: mp = &(*mp)->m_next;
1535: }
1.311 rmind 1536: if (inpflags & INP_RECVIF) {
1.44 thorpej 1537: struct sockaddr_dl sdl;
1538:
1.337 ozaki-r 1539: sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
1540: NULL, 0);
1.251 dyoung 1541: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1542: if (*mp)
1543: mp = &(*mp)->m_next;
1544: }
1.311 rmind 1545: if (inpflags & INP_RECVTTL) {
1.282 minskim 1546: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1547: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1548: if (*mp)
1549: mp = &(*mp)->m_next;
1550: }
1.329 ozaki-r 1551: m_put_rcvif_psref(ifp, &psref);
1.13 mycroft 1552: }
1553:
1.189 atatat 1554: /*
1.228 elad 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:
1.280 elad 1570: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1571: 0, NULL, NULL, NULL);
1572: if (error)
1573: return (error);
1.228 elad 1574:
1575: ip_forwsrcrt = tmp;
1576:
1577: return (0);
1578: }
1579:
1580: /*
1.189 atatat 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)
1.13 mycroft 1586: {
1.189 atatat 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);
1.52 thorpej 1598:
1.273 matt 1599: mutex_enter(softnet_lock);
1600:
1.189 atatat 1601: ip_mtudisc_timeout = tmp;
1602: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1603:
1.273 matt 1604: mutex_exit(softnet_lock);
1605:
1.189 atatat 1606: return (0);
1607: }
1.54 lukem 1608:
1.266 thorpej 1609: static int
1610: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1611: {
1612:
1.271 thorpej 1613: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1614: }
1.131 itojun 1615:
1.284 pooka 1616: static void
1617: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1618: {
1.197 atatat 1619: sysctl_createv(clog, 0, NULL, NULL,
1620: CTLFLAG_PERMANENT,
1.203 atatat 1621: CTLTYPE_NODE, "inet",
1622: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1623: NULL, 0, NULL, 0,
1624: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1625: sysctl_createv(clog, 0, NULL, NULL,
1626: CTLFLAG_PERMANENT,
1.203 atatat 1627: CTLTYPE_NODE, "ip",
1628: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1629: NULL, 0, NULL, 0,
1630: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1631:
1.197 atatat 1632: sysctl_createv(clog, 0, NULL, NULL,
1633: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1634: CTLTYPE_INT, "forwarding",
1635: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1636: NULL, 0, &ipforwarding, 0,
1637: CTL_NET, PF_INET, IPPROTO_IP,
1638: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1639: sysctl_createv(clog, 0, NULL, NULL,
1640: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1641: CTLTYPE_INT, "redirect",
1642: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1643: NULL, 0, &ipsendredirects, 0,
1644: CTL_NET, PF_INET, IPPROTO_IP,
1645: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1646: sysctl_createv(clog, 0, NULL, NULL,
1647: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1648: CTLTYPE_INT, "ttl",
1649: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1650: NULL, 0, &ip_defttl, 0,
1651: CTL_NET, PF_INET, IPPROTO_IP,
1652: IPCTL_DEFTTL, CTL_EOL);
1653: #ifdef IPCTL_DEFMTU
1.197 atatat 1654: sysctl_createv(clog, 0, NULL, NULL,
1655: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1656: CTLTYPE_INT, "mtu",
1657: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1658: NULL, 0, &ip_mtu, 0,
1659: CTL_NET, PF_INET, IPPROTO_IP,
1660: IPCTL_DEFMTU, CTL_EOL);
1661: #endif /* IPCTL_DEFMTU */
1.197 atatat 1662: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1663: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1664: CTLTYPE_INT, "forwsrcrt",
1665: SYSCTL_DESCR("Enable forwarding of source-routed "
1666: "datagrams"),
1.228 elad 1667: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1668: CTL_NET, PF_INET, IPPROTO_IP,
1669: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1670: sysctl_createv(clog, 0, NULL, NULL,
1671: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1672: CTLTYPE_INT, "directed-broadcast",
1673: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1674: NULL, 0, &ip_directedbcast, 0,
1675: CTL_NET, PF_INET, IPPROTO_IP,
1676: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1677: sysctl_createv(clog, 0, NULL, NULL,
1678: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1679: CTLTYPE_INT, "allowsrcrt",
1680: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1681: NULL, 0, &ip_allowsrcrt, 0,
1682: CTL_NET, PF_INET, IPPROTO_IP,
1683: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1684:
1.197 atatat 1685: sysctl_createv(clog, 0, NULL, NULL,
1686: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1687: CTLTYPE_INT, "mtudisc",
1688: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1689: NULL, 0, &ip_mtudisc, 0,
1690: CTL_NET, PF_INET, IPPROTO_IP,
1691: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1692: sysctl_createv(clog, 0, NULL, NULL,
1693: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1694: CTLTYPE_INT, "anonportmin",
1695: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1696: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1697: CTL_NET, PF_INET, IPPROTO_IP,
1698: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1699: sysctl_createv(clog, 0, NULL, NULL,
1700: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1701: CTLTYPE_INT, "anonportmax",
1702: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1703: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1704: CTL_NET, PF_INET, IPPROTO_IP,
1705: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1706: sysctl_createv(clog, 0, NULL, NULL,
1707: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1708: CTLTYPE_INT, "mtudisctimeout",
1709: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1710: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1711: CTL_NET, PF_INET, IPPROTO_IP,
1712: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1713: #ifndef IPNOPRIVPORTS
1.197 atatat 1714: sysctl_createv(clog, 0, NULL, NULL,
1715: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1716: CTLTYPE_INT, "lowportmin",
1717: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1718: "to assign"),
1.189 atatat 1719: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1720: CTL_NET, PF_INET, IPPROTO_IP,
1721: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1722: sysctl_createv(clog, 0, NULL, NULL,
1723: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1724: CTLTYPE_INT, "lowportmax",
1725: SYSCTL_DESCR("Highest privileged ephemeral port number "
1726: "to assign"),
1.189 atatat 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
1.197 atatat 1732: sysctl_createv(clog, 0, NULL, NULL,
1733: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1734: CTLTYPE_INT, "grettl",
1735: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1736: NULL, 0, &ip_gre_ttl, 0,
1737: CTL_NET, PF_INET, IPPROTO_IP,
1738: IPCTL_GRE_TTL, CTL_EOL);
1739: #endif /* NGRE */
1.197 atatat 1740: sysctl_createv(clog, 0, NULL, NULL,
1741: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1742: CTLTYPE_INT, "checkinterface",
1743: SYSCTL_DESCR("Enable receive side of Strong ES model "
1744: "from RFC1122"),
1.189 atatat 1745: NULL, 0, &ip_checkinterface, 0,
1746: CTL_NET, PF_INET, IPPROTO_IP,
1747: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1748: sysctl_createv(clog, 0, NULL, NULL,
1749: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1750: CTLTYPE_INT, "random_id",
1751: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1752: NULL, 0, &ip_do_randomid, 0,
1753: CTL_NET, PF_INET, IPPROTO_IP,
1754: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 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);
1.219 elad 1762: sysctl_createv(clog, 0, NULL, NULL,
1763: CTLFLAG_PERMANENT,
1764: CTLTYPE_STRUCT, "stats",
1765: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1766: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1767: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1768: CTL_EOL);
1.322 joerg 1769: #if NARP
1.321 roy 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);
1.322 joerg 1778: #endif
1.301 christos 1779:
1780: /* anonportalgo RFC6056 subtree */
1.302 christos 1781: const struct sysctlnode *portalgo_node;
1782: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 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);
1.302 christos 1788: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1789: CTLFLAG_PERMANENT,
1790: CTLTYPE_STRING, "available",
1791: SYSCTL_DESCR("available algorithms"),
1.302 christos 1792: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1793: CTL_CREATE, CTL_EOL);
1.302 christos 1794: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1795: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1796: CTLTYPE_STRING, "selected",
1797: SYSCTL_DESCR("selected algorithm"),
1.303 christos 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,
1.301 christos 1805: CTL_CREATE, CTL_EOL);
1.1 cgd 1806: }
1.266 thorpej 1807:
1808: void
1809: ip_statinc(u_int stat)
1810: {
1811:
1812: KASSERT(stat < IP_NSTATS);
1813: IP_STATINC(stat);
1814: }
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