Annotation of src/sys/netinet/ip_input.c, Revision 1.341
1.341 ! roy 1: /* $NetBSD: ip_input.c,v 1.340 2016/08/31 09:14:47 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>
1.341 ! roy 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.340 2016/08/31 09:14:47 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"
1.324 pooka 104: #endif
1.1 cgd 105:
1.325 roy 106: #include "arp.h"
107:
1.5 mycroft 108: #include <sys/param.h>
109: #include <sys/systm.h>
1.318 rmind 110: #include <sys/cpu.h>
1.5 mycroft 111: #include <sys/mbuf.h>
112: #include <sys/domain.h>
113: #include <sys/protosw.h>
114: #include <sys/socket.h>
1.44 thorpej 115: #include <sys/socketvar.h>
1.5 mycroft 116: #include <sys/errno.h>
117: #include <sys/time.h>
118: #include <sys/kernel.h>
1.72 thorpej 119: #include <sys/pool.h>
1.28 christos 120: #include <sys/sysctl.h>
1.230 elad 121: #include <sys/kauth.h>
1.1 cgd 122:
1.5 mycroft 123: #include <net/if.h>
1.44 thorpej 124: #include <net/if_dl.h>
1.5 mycroft 125: #include <net/route.h>
1.318 rmind 126: #include <net/pktqueue.h>
1.45 mrg 127: #include <net/pfil.h>
1.1 cgd 128:
1.5 mycroft 129: #include <netinet/in.h>
130: #include <netinet/in_systm.h>
131: #include <netinet/ip.h>
132: #include <netinet/in_pcb.h>
1.215 yamt 133: #include <netinet/in_proto.h>
1.5 mycroft 134: #include <netinet/in_var.h>
135: #include <netinet/ip_var.h>
1.266 thorpej 136: #include <netinet/ip_private.h>
1.5 mycroft 137: #include <netinet/ip_icmp.h>
1.89 itojun 138: /* just for gif_ttl */
139: #include <netinet/in_gif.h>
140: #include "gif.h"
1.144 martin 141: #include <net/if_gre.h>
142: #include "gre.h"
1.111 jdolecek 143:
144: #ifdef MROUTING
145: #include <netinet/ip_mroute.h>
146: #endif
1.302 christos 147: #include <netinet/portalgo.h>
1.89 itojun 148:
1.304 christos 149: #ifdef IPSEC
1.173 jonathan 150: #include <netipsec/ipsec.h>
1.305 rmind 151: #endif
1.44 thorpej 152:
1.1 cgd 153: #ifndef IPFORWARDING
154: #ifdef GATEWAY
155: #define IPFORWARDING 1 /* forward IP packets not for us */
156: #else /* GATEWAY */
157: #define IPFORWARDING 0 /* don't forward IP packets not for us */
158: #endif /* GATEWAY */
159: #endif /* IPFORWARDING */
160: #ifndef IPSENDREDIRECTS
161: #define IPSENDREDIRECTS 1
162: #endif
1.26 thorpej 163: #ifndef IPFORWSRCRT
1.47 cjs 164: #define IPFORWSRCRT 1 /* forward source-routed packets */
165: #endif
166: #ifndef IPALLOWSRCRT
1.48 mrg 167: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 168: #endif
1.53 kml 169: #ifndef IPMTUDISC
1.153 itojun 170: #define IPMTUDISC 1
1.53 kml 171: #endif
1.60 kml 172: #ifndef IPMTUDISCTIMEOUT
1.61 kml 173: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 174: #endif
1.53 kml 175:
1.278 christos 176: #ifdef COMPAT_50
177: #include <compat/sys/time.h>
178: #include <compat/sys/socket.h>
179: #endif
180:
1.27 thorpej 181: /*
182: * Note: DIRECTED_BROADCAST is handled this way so that previous
183: * configuration using this option will Just Work.
184: */
185: #ifndef IPDIRECTEDBCAST
186: #ifdef DIRECTED_BROADCAST
187: #define IPDIRECTEDBCAST 1
188: #else
189: #define IPDIRECTEDBCAST 0
190: #endif /* DIRECTED_BROADCAST */
191: #endif /* IPDIRECTEDBCAST */
1.1 cgd 192: int ipforwarding = IPFORWARDING;
193: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 194: int ip_defttl = IPDEFTTL;
1.26 thorpej 195: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 196: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 197: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 198: int ip_mtudisc = IPMTUDISC;
1.156 itojun 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 200: #ifdef DIAGNOSTIC
201: int ipprintfs = 0;
202: #endif
1.184 jonathan 203:
204: int ip_do_randomid = 0;
205:
1.165 christos 206: /*
207: * XXX - Setting ip_checkinterface mostly implements the receive side of
208: * the Strong ES model described in RFC 1122, but since the routing table
209: * and transmit implementation do not implement the Strong ES model,
210: * setting this to 1 results in an odd hybrid.
211: *
212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
213: * to translate the destination address to another local interface.
214: *
215: * XXX - ip_checkinterface must be disabled if you add IP aliases
216: * to the loopback interface instead of the interface where the
217: * packets for those addresses are received.
218: */
1.318 rmind 219: static int ip_checkinterface __read_mostly = 0;
1.165 christos 220:
1.60 kml 221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
222:
1.318 rmind 223: pktqueue_t * ip_pktq __read_mostly;
224: pfil_head_t * inet_pfil_hook __read_mostly;
225: ipid_state_t * ip_ids __read_mostly;
226: percpu_t * ipstat_percpu __read_mostly;
227:
1.340 ozaki-r 228: static percpu_t *ipforward_rt_percpu __cacheline_aligned;
1.286 tls 229:
1.183 jonathan 230: uint16_t ip_id;
1.75 thorpej 231:
1.135 thorpej 232: #ifdef INET_CSUM_COUNTERS
233: #include <sys/device.h>
234:
235: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
236: NULL, "inet", "hwcsum bad");
237: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
238: NULL, "inet", "hwcsum ok");
239: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
240: NULL, "inet", "swcsum");
241:
242: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
243:
1.201 matt 244: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
245: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
246: EVCNT_ATTACH_STATIC(ip_swcsum);
247:
1.135 thorpej 248: #else
249:
250: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
251:
252: #endif /* INET_CSUM_COUNTERS */
253:
1.1 cgd 254: /*
255: * We need to save the IP options in case a protocol wants to respond
256: * to an incoming packet over the same route if the packet got here
257: * using IP source routing. This allows connection establishment and
258: * maintenance when the remote end is on a network that is not known
259: * to us.
260: */
1.311 rmind 261:
262: static int ip_nhops = 0;
263:
1.1 cgd 264: static struct ip_srcrt {
265: struct in_addr dst; /* final destination */
266: char nop; /* one NOP to align */
267: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
268: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
269: } ip_srcrt;
270:
1.295 dyoung 271: static int ip_drainwanted;
272:
1.318 rmind 273: struct sockaddr_in ipaddr = {
274: .sin_len = sizeof(ipaddr),
275: .sin_family = AF_INET,
276: };
277:
1.210 perry 278: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 279:
1.164 matt 280: #ifdef MBUFTRACE
1.234 dogcow 281: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
282: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 283: #endif
284:
1.318 rmind 285: static void ipintr(void *);
1.312 rmind 286: static void ip_input(struct mbuf *);
1.329 ozaki-r 287: static void ip_forward(struct mbuf *, int, struct ifnet *);
1.311 rmind 288: static bool ip_dooptions(struct mbuf *);
289: static struct in_ifaddr *ip_rtaddr(struct in_addr);
290: static void sysctl_net_inet_ip_setup(struct sysctllog **);
1.284 pooka 291:
1.333 ozaki-r 292: static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *,
293: int *);
294: static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *,
295: struct ip *);
296:
1.318 rmind 297: /* XXX: Not yet enabled. */
298: #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
299: #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
300:
1.1 cgd 301: /*
302: * IP initialization: fill in IP protocol switch table.
303: * All protocols not implemented in kernel go to raw IP protocol handler.
304: */
1.8 mycroft 305: void
1.211 perry 306: ip_init(void)
1.1 cgd 307: {
1.199 matt 308: const struct protosw *pr;
1.1 cgd 309:
1.311 rmind 310: in_init();
1.284 pooka 311: sysctl_net_inet_ip_setup(NULL);
312:
1.311 rmind 313: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
314: KASSERT(pr != NULL);
1.275 pooka 315:
1.319 ozaki-r 316: ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318 rmind 317: KASSERT(ip_pktq != NULL);
318:
1.328 riastrad 319: for (u_int i = 0; i < IPPROTO_MAX; i++) {
320: ip_protox[i] = pr - inetsw;
1.311 rmind 321: }
1.328 riastrad 322: for (pr = inetdomain.dom_protosw;
323: pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1 cgd 324: if (pr->pr_domain->dom_family == PF_INET &&
325: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328 riastrad 326: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 327:
1.288 rmind 328: ip_reass_init();
1.190 jonathan 329:
1.291 rmind 330: ip_ids = ip_id_init();
1.323 ozaki-r 331: ip_id = time_uptime & 0xfffff;
1.194 jonathan 332:
1.160 itojun 333: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 334: #ifdef GATEWAY
1.311 rmind 335: ipflow_init();
1.73 thorpej 336: #endif
1.121 thorpej 337:
338: /* Register our Packet Filter hook. */
1.308 rmind 339: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
340: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 341:
1.164 matt 342: #ifdef MBUFTRACE
343: MOWNER_ATTACH(&ip_tx_mowner);
344: MOWNER_ATTACH(&ip_rx_mowner);
345: #endif /* MBUFTRACE */
1.266 thorpej 346:
347: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340 ozaki-r 348:
349: ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
350: if (ipforward_rt_percpu == NULL)
351: panic("failed to allocate ipforward_rt_percpu");
1.1 cgd 352: }
353:
1.333 ozaki-r 354: static struct in_ifaddr *
355: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
356: {
357: struct in_ifaddr *ia = NULL;
358: int checkif;
359:
360: /*
361: * Enable a consistency check between the destination address
362: * and the arrival interface for a unicast packet (the RFC 1122
363: * strong ES model) if IP forwarding is disabled and the packet
364: * is not locally generated.
365: *
366: * XXX - Checking also should be disabled if the destination
367: * address is ipnat'ed to a different interface.
368: *
369: * XXX - Checking is incompatible with IP aliases added
370: * to the loopback interface instead of the interface where
371: * the packets are received.
372: *
373: * XXX - We need to add a per ifaddr flag for this so that
374: * we get finer grain control.
375: */
376: checkif = ip_checkinterface && (ipforwarding == 0) &&
377: (ifp->if_flags & IFF_LOOPBACK) == 0;
378:
1.334 ozaki-r 379: IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333 ozaki-r 380: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
381: if (ia->ia4_flags & IN_IFF_NOTREADY)
382: continue;
383: if (checkif && ia->ia_ifp != ifp)
384: continue;
1.341 ! roy 385: if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
! 386: (ia->ia4_flags & IN_IFF_DETACHED) == 0)
1.333 ozaki-r 387: break;
388: else
1.338 ozaki-r 389: (*downmatch)++;
1.333 ozaki-r 390: }
391: }
392:
393: return ia;
394: }
395:
396: static struct in_ifaddr *
397: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
398: {
399: struct in_ifaddr *ia = NULL;
400: struct ifaddr *ifa;
401:
1.336 ozaki-r 402: IFADDR_READER_FOREACH(ifa, ifp) {
1.333 ozaki-r 403: if (ifa->ifa_addr->sa_family != AF_INET)
404: continue;
405: ia = ifatoia(ifa);
1.341 ! roy 406: if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
1.333 ozaki-r 407: continue;
408: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
409: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
410: /*
411: * Look for all-0's host part (old broadcast addr),
412: * either for subnet or net.
413: */
414: ip->ip_dst.s_addr == ia->ia_subnet ||
415: ip->ip_dst.s_addr == ia->ia_net)
416: goto matched;
417: /*
418: * An interface with IP address zero accepts
419: * all packets that arrive on that interface.
420: */
421: if (in_nullhost(ia->ia_addr.sin_addr))
422: goto matched;
423: }
424: ia = NULL;
425:
426: matched:
427: return ia;
428: }
429:
1.1 cgd 430: /*
1.318 rmind 431: * IP software interrupt routine.
1.89 itojun 432: */
1.318 rmind 433: static void
434: ipintr(void *arg __unused)
1.89 itojun 435: {
436: struct mbuf *m;
1.286 tls 437:
1.318 rmind 438: KASSERT(cpu_softintr_p());
1.89 itojun 439:
1.268 ad 440: mutex_enter(softnet_lock);
1.318 rmind 441: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 442: ip_input(m);
443: }
1.268 ad 444: mutex_exit(softnet_lock);
1.89 itojun 445: }
446:
447: /*
1.318 rmind 448: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 449: * try to reassemble. Process options. Pass to next level.
450: */
1.312 rmind 451: static void
1.89 itojun 452: ip_input(struct mbuf *m)
1.1 cgd 453: {
1.109 augustss 454: struct ip *ip = NULL;
1.339 ozaki-r 455: struct in_ifaddr *ia = NULL;
1.288 rmind 456: int hlen = 0, len;
1.100 itojun 457: int downmatch;
1.169 itojun 458: int srcrt = 0;
1.314 rmind 459: ifnet_t *ifp;
1.329 ozaki-r 460: struct psref psref;
1.339 ozaki-r 461: int s;
1.1 cgd 462:
1.318 rmind 463: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
464: "interrupt handler; synchronization assumptions violated");
465:
1.164 matt 466: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 467: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329 ozaki-r 468:
469: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 470: if (__predict_false(ifp == NULL))
1.332 ozaki-r 471: goto out;
1.164 matt 472:
1.1 cgd 473: /*
474: * If no IP addresses have been set yet but the interfaces
475: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 476: * Note: we pre-check without locks held.
1.1 cgd 477: */
1.335 ozaki-r 478: if (IN_ADDRLIST_READER_EMPTY())
1.332 ozaki-r 479: goto out;
1.266 thorpej 480: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 481:
1.154 thorpej 482: /*
483: * If the IP header is not aligned, slurp it up into a new
484: * mbuf with space for link headers, in the event we forward
485: * it. Otherwise, if it is aligned, make sure the entire
486: * base IP header is in the first mbuf of the chain.
487: */
1.244 christos 488: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 489: if ((m = m_copyup(m, sizeof(struct ip),
490: (max_linkhdr + 3) & ~3)) == NULL) {
491: /* XXXJRT new stat, please */
1.266 thorpej 492: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 493: goto out;
1.154 thorpej 494: }
495: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
496: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 497: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 498: goto out;
1.154 thorpej 499: }
1.1 cgd 500: }
501: ip = mtod(m, struct ip *);
1.13 mycroft 502: if (ip->ip_v != IPVERSION) {
1.266 thorpej 503: IP_STATINC(IP_STAT_BADVERS);
1.332 ozaki-r 504: goto out;
1.13 mycroft 505: }
1.1 cgd 506: hlen = ip->ip_hl << 2;
507: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 508: IP_STATINC(IP_STAT_BADHLEN);
1.332 ozaki-r 509: goto out;
1.1 cgd 510: }
511: if (hlen > m->m_len) {
1.298 liamjfoy 512: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 513: IP_STATINC(IP_STAT_BADHLEN);
1.329 ozaki-r 514: goto out;
1.1 cgd 515: }
516: ip = mtod(m, struct ip *);
517: }
1.98 thorpej 518:
1.85 hwr 519: /*
1.99 thorpej 520: * RFC1122: packets with a multicast source address are
1.98 thorpej 521: * not allowed.
1.85 hwr 522: */
523: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 524: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 525: goto out;
1.129 itojun 526: }
527:
528: /* 127/8 must not appear on wire - RFC1122 */
529: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
530: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314 rmind 531: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 532: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 533: goto out;
1.130 itojun 534: }
1.85 hwr 535: }
536:
1.135 thorpej 537: switch (m->m_pkthdr.csum_flags &
1.314 rmind 538: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 539: M_CSUM_IPv4_BAD)) {
540: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
541: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332 ozaki-r 542: IP_STATINC(IP_STAT_BADSUM);
543: goto out;
1.135 thorpej 544:
545: case M_CSUM_IPv4:
546: /* Checksum was okay. */
547: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
548: break;
549:
550: default:
1.206 thorpej 551: /*
552: * Must compute it ourselves. Maybe skip checksum on
553: * loopback interfaces.
554: */
1.314 rmind 555: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
556: ip_do_loopback_cksum)) {
1.206 thorpej 557: INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332 ozaki-r 558: if (in_cksum(m, hlen) != 0) {
559: IP_STATINC(IP_STAT_BADSUM);
560: goto out;
561: }
1.206 thorpej 562: }
1.135 thorpej 563: break;
1.1 cgd 564: }
565:
1.121 thorpej 566: /* Retrieve the packet length. */
567: len = ntohs(ip->ip_len);
1.81 proff 568:
569: /*
570: * Check for additional length bogosity
571: */
1.84 proff 572: if (len < hlen) {
1.266 thorpej 573: IP_STATINC(IP_STAT_BADLEN);
1.332 ozaki-r 574: goto out;
1.81 proff 575: }
1.1 cgd 576:
577: /*
578: * Check that the amount of data in the buffers
579: * is as at least much as the IP header would have us expect.
580: * Trim mbufs if longer than we expect.
581: * Drop packet if shorter than we expect.
582: */
1.35 mycroft 583: if (m->m_pkthdr.len < len) {
1.266 thorpej 584: IP_STATINC(IP_STAT_TOOSHORT);
1.332 ozaki-r 585: goto out;
1.1 cgd 586: }
1.35 mycroft 587: if (m->m_pkthdr.len > len) {
1.1 cgd 588: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 589: m->m_len = len;
590: m->m_pkthdr.len = len;
1.1 cgd 591: } else
1.35 mycroft 592: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 593: }
594:
1.64 thorpej 595: /*
596: * Assume that we can create a fast-forward IP flow entry
597: * based on this packet.
598: */
599: m->m_flags |= M_CANFASTFWD;
600:
1.33 mrg 601: /*
1.64 thorpej 602: * Run through list of hooks for input packets. If there are any
603: * filters which require that additional packets in the flow are
604: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
605: * Note that filters must _never_ set this flag, as another filter
606: * in the list may have previously cleared it.
1.33 mrg 607: */
1.304 christos 608: #if defined(IPSEC)
1.317 christos 609: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 610: #else
611: if (1)
612: #endif
613: {
1.314 rmind 614: struct in_addr odst = ip->ip_dst;
1.318 rmind 615: bool freed;
1.169 itojun 616:
1.318 rmind 617: SOFTNET_LOCK();
618: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
619: SOFTNET_UNLOCK();
620: if (freed || 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();
1.329 ozaki-r 650: goto out;
1.318 rmind 651: }
652: SOFTNET_UNLOCK();
1.123 thorpej 653: }
654: #endif
1.121 thorpej 655:
656: /*
1.1 cgd 657: * Process options and, if not destined for us,
658: * ship it on. ip_dooptions returns 1 when an
659: * error was detected (causing an icmp message
660: * to be sent and the original packet to be freed).
661: */
662: ip_nhops = 0; /* for source routed packets */
663: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.329 ozaki-r 664: goto out;
1.1 cgd 665:
666: /*
667: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 668: *
669: * Traditional 4.4BSD did not consult IFF_UP at all.
670: * The behavior here is to treat addresses on !IFF_UP interface
1.321 roy 671: * or IN_IFF_NOTREADY addresses as not mine.
1.1 cgd 672: */
1.100 itojun 673: downmatch = 0;
1.339 ozaki-r 674: s = pserialize_read_enter();
1.333 ozaki-r 675: ia = ip_match_our_address(ifp, ip, &downmatch);
1.339 ozaki-r 676: if (ia != NULL) {
677: pserialize_read_exit(s);
1.86 thorpej 678: goto ours;
1.339 ozaki-r 679: }
1.333 ozaki-r 680:
1.315 christos 681: if (ifp->if_flags & IFF_BROADCAST) {
1.333 ozaki-r 682: ia = ip_match_our_address_broadcast(ifp, ip);
1.339 ozaki-r 683: if (ia != NULL) {
684: pserialize_read_exit(s);
1.333 ozaki-r 685: goto ours;
1.339 ozaki-r 686: }
1.1 cgd 687: }
1.339 ozaki-r 688: pserialize_read_exit(s);
1.333 ozaki-r 689:
1.18 mycroft 690: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 691: #ifdef MROUTING
692: extern struct socket *ip_mrouter;
1.10 brezak 693:
1.4 hpeyerl 694: if (ip_mrouter) {
695: /*
696: * If we are acting as a multicast router, all
697: * incoming multicast packets are passed to the
698: * kernel-level multicast forwarding function.
699: * The packet is returned (relatively) intact; if
700: * ip_mforward() returns a non-zero value, the packet
701: * must be discarded, else it may be accepted below.
702: *
703: * (The IP ident field is put in the same byte order
704: * as expected when ip_mforward() is called from
705: * ip_output().)
706: */
1.318 rmind 707: SOFTNET_LOCK();
1.314 rmind 708: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 709: SOFTNET_UNLOCK();
1.266 thorpej 710: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 711: goto out;
1.4 hpeyerl 712: }
1.318 rmind 713: SOFTNET_UNLOCK();
1.4 hpeyerl 714:
715: /*
716: * The process-level routing demon needs to receive
717: * all multicast IGMP packets, whether or not this
718: * host belongs to their destination groups.
719: */
1.318 rmind 720: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 721: goto ours;
1.318 rmind 722: }
1.266 thorpej 723: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 724: }
725: #endif
726: /*
727: * See if we belong to the destination multicast group on the
728: * arrival interface.
729: */
1.316 rmind 730: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 731: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 732: goto out;
1.4 hpeyerl 733: }
734: goto ours;
735: }
1.19 mycroft 736: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 737: in_nullhost(ip->ip_dst))
1.1 cgd 738: goto ours;
739:
740: /*
741: * Not for us; forward if possible and desirable.
742: */
743: if (ipforwarding == 0) {
1.329 ozaki-r 744: m_put_rcvif_psref(ifp, &psref);
1.266 thorpej 745: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 746: m_freem(m);
1.100 itojun 747: } else {
748: /*
749: * If ip_dst matched any of my address on !IFF_UP interface,
750: * and there's no IFF_UP interface that matches ip_dst,
751: * send icmp unreach. Forwarding it will result in in-kernel
752: * forwarding loop till TTL goes to 0.
753: */
754: if (downmatch) {
1.329 ozaki-r 755: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 756: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 757: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 758: return;
759: }
1.304 christos 760: #ifdef IPSEC
1.305 rmind 761: /* Perform IPsec, if any. */
1.318 rmind 762: if (ipsec_used) {
763: SOFTNET_LOCK();
764: if (ipsec4_input(m, IP_FORWARDING |
765: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
766: SOFTNET_UNLOCK();
1.332 ozaki-r 767: goto out;
1.318 rmind 768: }
769: SOFTNET_UNLOCK();
1.173 jonathan 770: }
1.305 rmind 771: #endif
1.329 ozaki-r 772: ip_forward(m, srcrt, ifp);
773: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 774: }
1.89 itojun 775: return;
1.1 cgd 776:
777: ours:
1.329 ozaki-r 778: m_put_rcvif_psref(ifp, &psref);
1.331 ozaki-r 779: ifp = NULL;
1.329 ozaki-r 780:
1.1 cgd 781: /*
782: * If offset or IP_MF are set, must reassemble.
783: */
1.155 itojun 784: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 785: /*
786: * Pass to IP reassembly mechanism.
787: */
1.290 rmind 788: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 789: /* Failed; invalid fragment(s) or packet. */
1.332 ozaki-r 790: goto out;
1.16 cgd 791: }
1.290 rmind 792: if (m == NULL) {
1.289 rmind 793: /* More fragments should come; silently return. */
1.332 ozaki-r 794: goto out;
1.289 rmind 795: }
1.290 rmind 796: /*
797: * Reassembly is done, we have the final packet.
798: * Updated cached data in local variable(s).
799: */
1.289 rmind 800: ip = mtod(m, struct ip *);
801: hlen = ip->ip_hl << 2;
1.79 mycroft 802: }
1.128 itojun 803:
1.304 christos 804: #ifdef IPSEC
1.173 jonathan 805: /*
1.305 rmind 806: * Enforce IPsec policy checking if we are seeing last header.
807: * Note that we do not visit this with protocols with PCB layer
808: * code - like UDP/TCP/raw IP.
1.173 jonathan 809: */
1.317 christos 810: if (ipsec_used &&
1.328 riastrad 811: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318 rmind 812: SOFTNET_LOCK();
1.305 rmind 813: if (ipsec4_input(m, 0) != 0) {
1.318 rmind 814: SOFTNET_UNLOCK();
1.332 ozaki-r 815: goto out;
1.173 jonathan 816: }
1.318 rmind 817: SOFTNET_UNLOCK();
1.173 jonathan 818: }
1.305 rmind 819: #endif
1.1 cgd 820:
821: /*
822: * Switch out to protocol's input routine.
823: */
1.82 aidan 824: #if IFA_STATS
1.339 ozaki-r 825: if (ia && ip) {
826: struct in_ifaddr *_ia;
827: /*
828: * Keep a reference from ip_match_our_address with psref
829: * is expensive, so explore ia here again.
830: */
831: s = pserialize_read_enter();
832: _ia = in_get_ia(ip->ip_dst.s_addr);
833: _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
834: pserialize_read_exit(s);
835: }
1.82 aidan 836: #endif
1.266 thorpej 837: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 838:
1.318 rmind 839: const int off = hlen, nh = ip->ip_p;
840:
841: SOFTNET_LOCK();
1.328 riastrad 842: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318 rmind 843: SOFTNET_UNLOCK();
1.89 itojun 844: return;
1.135 thorpej 845:
1.329 ozaki-r 846: out:
847: m_put_rcvif_psref(ifp, &psref);
1.332 ozaki-r 848: if (m != NULL)
849: m_freem(m);
1.1 cgd 850: }
851:
852: /*
1.288 rmind 853: * IP timer processing.
1.1 cgd 854: */
1.8 mycroft 855: void
1.211 perry 856: ip_slowtimo(void)
1.1 cgd 857: {
1.268 ad 858:
859: mutex_enter(softnet_lock);
860: KERNEL_LOCK(1, NULL);
1.1 cgd 861:
1.288 rmind 862: ip_reass_slowtimo();
1.268 ad 863:
864: KERNEL_UNLOCK_ONE(NULL);
865: mutex_exit(softnet_lock);
1.1 cgd 866: }
867:
868: /*
1.288 rmind 869: * IP drain processing.
1.1 cgd 870: */
1.8 mycroft 871: void
1.211 perry 872: ip_drain(void)
1.1 cgd 873: {
874:
1.268 ad 875: KERNEL_LOCK(1, NULL);
1.288 rmind 876: ip_reass_drain();
1.268 ad 877: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 878: }
879:
880: /*
1.311 rmind 881: * ip_dooptions: perform option processing on a datagram, possibly discarding
882: * it if bad options are encountered, or forwarding it if source-routed.
883: *
884: * => Returns true if packet has been forwarded/freed.
885: * => Returns false if the packet should be processed further.
1.1 cgd 886: */
1.311 rmind 887: static bool
1.211 perry 888: ip_dooptions(struct mbuf *m)
1.1 cgd 889: {
1.109 augustss 890: struct ip *ip = mtod(m, struct ip *);
891: u_char *cp, *cp0;
892: struct ip_timestamp *ipt;
893: struct in_ifaddr *ia;
1.1 cgd 894: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 895: struct in_addr dst;
1.1 cgd 896: n_time ntime;
1.339 ozaki-r 897: struct ifaddr *ifa;
898: int s;
1.1 cgd 899:
1.13 mycroft 900: dst = ip->ip_dst;
1.1 cgd 901: cp = (u_char *)(ip + 1);
902: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
903: for (; cnt > 0; cnt -= optlen, cp += optlen) {
904: opt = cp[IPOPT_OPTVAL];
905: if (opt == IPOPT_EOL)
906: break;
907: if (opt == IPOPT_NOP)
908: optlen = 1;
909: else {
1.113 itojun 910: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
911: code = &cp[IPOPT_OLEN] - (u_char *)ip;
912: goto bad;
913: }
1.1 cgd 914: optlen = cp[IPOPT_OLEN];
1.114 itojun 915: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 916: code = &cp[IPOPT_OLEN] - (u_char *)ip;
917: goto bad;
918: }
919: }
920: switch (opt) {
921:
922: default:
923: break;
924:
925: /*
926: * Source routing with record.
927: * Find interface with current destination address.
928: * If none on this machine then drop if strictly routed,
929: * or do nothing if loosely routed.
930: * Record interface address and bring up next address
931: * component. If strictly routed make sure next
932: * address is on directly accessible net.
933: */
934: case IPOPT_LSRR:
935: case IPOPT_SSRR:
1.47 cjs 936: if (ip_allowsrcrt == 0) {
937: type = ICMP_UNREACH;
938: code = ICMP_UNREACH_NET_PROHIB;
939: goto bad;
940: }
1.114 itojun 941: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
942: code = &cp[IPOPT_OLEN] - (u_char *)ip;
943: goto bad;
944: }
1.1 cgd 945: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
946: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
947: goto bad;
948: }
949: ipaddr.sin_addr = ip->ip_dst;
1.339 ozaki-r 950:
951: s = pserialize_read_enter();
952: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
953: if (ifa == NULL) {
954: pserialize_read_exit(s);
1.1 cgd 955: if (opt == IPOPT_SSRR) {
956: type = ICMP_UNREACH;
957: code = ICMP_UNREACH_SRCFAIL;
958: goto bad;
959: }
960: /*
961: * Loose routing, and not at next destination
962: * yet; nothing to do except forward.
963: */
964: break;
965: }
1.339 ozaki-r 966: pserialize_read_exit(s);
967:
1.1 cgd 968: off--; /* 0 origin */
1.112 sommerfe 969: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 970: /*
971: * End of source route. Should be for us.
972: */
973: save_rte(cp, ip->ip_src);
974: break;
975: }
976: /*
977: * locate outgoing interface
978: */
1.281 tsutsui 979: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 980: sizeof(ipaddr.sin_addr));
1.339 ozaki-r 981: s = pserialize_read_enter();
982: if (opt == IPOPT_SSRR) {
983: ifa = ifa_ifwithladdr(sintosa(&ipaddr));
984: if (ifa != NULL)
985: ia = ifatoia(ifa);
986: else
987: ia = NULL;
988: } else {
1.1 cgd 989: ia = ip_rtaddr(ipaddr.sin_addr);
1.339 ozaki-r 990: }
991: if (ia == NULL) {
1.1 cgd 992: type = ICMP_UNREACH;
993: code = ICMP_UNREACH_SRCFAIL;
1.339 ozaki-r 994: pserialize_read_exit(s);
1.1 cgd 995: goto bad;
996: }
997: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 998: bcopy((void *)&ia->ia_addr.sin_addr,
999: (void *)(cp + off), sizeof(struct in_addr));
1.339 ozaki-r 1000: pserialize_read_exit(s);
1.1 cgd 1001: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1002: /*
1003: * Let ip_intr's mcast routing check handle mcast pkts
1004: */
1.18 mycroft 1005: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1006: break;
1007:
1008: case IPOPT_RR:
1.114 itojun 1009: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1010: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1011: goto bad;
1012: }
1.1 cgd 1013: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1014: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1015: goto bad;
1016: }
1017: /*
1018: * If no space remains, ignore.
1019: */
1020: off--; /* 0 origin */
1.112 sommerfe 1021: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1022: break;
1.281 tsutsui 1023: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 1024: sizeof(ipaddr.sin_addr));
1025: /*
1026: * locate outgoing interface; if we're the destination,
1027: * use the incoming interface (should be same).
1028: */
1.339 ozaki-r 1029: s = pserialize_read_enter();
1030: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
1031: if (ifa == NULL) {
1032: ia = ip_rtaddr(ipaddr.sin_addr);
1033: if (ia == NULL) {
1034: pserialize_read_exit(s);
1035: type = ICMP_UNREACH;
1036: code = ICMP_UNREACH_HOST;
1037: goto bad;
1038: }
1039: } else {
1040: ia = ifatoia(ifa);
1.1 cgd 1041: }
1.244 christos 1042: bcopy((void *)&ia->ia_addr.sin_addr,
1043: (void *)(cp + off), sizeof(struct in_addr));
1.339 ozaki-r 1044: pserialize_read_exit(s);
1.1 cgd 1045: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1046: break;
1047:
1048: case IPOPT_TS:
1049: code = cp - (u_char *)ip;
1050: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1051: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1052: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1053: goto bad;
1.114 itojun 1054: }
1055: if (ipt->ipt_ptr < 5) {
1056: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1057: goto bad;
1058: }
1.15 cgd 1059: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1060: if (++ipt->ipt_oflw == 0) {
1061: code = (u_char *)&ipt->ipt_ptr -
1062: (u_char *)ip;
1.1 cgd 1063: goto bad;
1.114 itojun 1064: }
1.1 cgd 1065: break;
1066: }
1.104 thorpej 1067: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1068: switch (ipt->ipt_flg) {
1069:
1070: case IPOPT_TS_TSONLY:
1071: break;
1072:
1.329 ozaki-r 1073: case IPOPT_TS_TSANDADDR: {
1074: struct ifnet *rcvif;
1.339 ozaki-r 1075: int _s, _ss;
1.329 ozaki-r 1076:
1.66 thorpej 1077: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1078: sizeof(struct in_addr) > ipt->ipt_len) {
1079: code = (u_char *)&ipt->ipt_ptr -
1080: (u_char *)ip;
1.1 cgd 1081: goto bad;
1.114 itojun 1082: }
1.13 mycroft 1083: ipaddr.sin_addr = dst;
1.339 ozaki-r 1084: _ss = pserialize_read_enter();
1085: rcvif = m_get_rcvif(m, &_s);
1086: ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif);
1087: m_put_rcvif(rcvif, &_s);
1088: if (ifa == NULL) {
1089: pserialize_read_exit(_ss);
1090: break;
1091: }
1092: ia = ifatoia(ifa);
1.104 thorpej 1093: bcopy(&ia->ia_addr.sin_addr,
1094: cp0, sizeof(struct in_addr));
1.339 ozaki-r 1095: pserialize_read_exit(_ss);
1.1 cgd 1096: ipt->ipt_ptr += sizeof(struct in_addr);
1097: break;
1.329 ozaki-r 1098: }
1.1 cgd 1099:
1100: case IPOPT_TS_PRESPEC:
1.66 thorpej 1101: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1102: sizeof(struct in_addr) > ipt->ipt_len) {
1103: code = (u_char *)&ipt->ipt_ptr -
1104: (u_char *)ip;
1.1 cgd 1105: goto bad;
1.114 itojun 1106: }
1.281 tsutsui 1107: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1108: sizeof(struct in_addr));
1.339 ozaki-r 1109: s = pserialize_read_enter();
1110: ifa = ifa_ifwithaddr(sintosa(&ipaddr));
1111: if (ifa == NULL) {
1112: pserialize_read_exit(s);
1.1 cgd 1113: continue;
1.339 ozaki-r 1114: }
1115: pserialize_read_exit(s);
1.1 cgd 1116: ipt->ipt_ptr += sizeof(struct in_addr);
1117: break;
1118:
1119: default:
1.114 itojun 1120: /* XXX can't take &ipt->ipt_flg */
1121: code = (u_char *)&ipt->ipt_ptr -
1122: (u_char *)ip + 1;
1.1 cgd 1123: goto bad;
1124: }
1125: ntime = iptime();
1.107 thorpej 1126: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1127: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1128: sizeof(n_time));
1129: ipt->ipt_ptr += sizeof(n_time);
1130: }
1131: }
1132: if (forward) {
1.329 ozaki-r 1133: struct ifnet *rcvif;
1.339 ozaki-r 1134: struct psref _psref;
1.329 ozaki-r 1135:
1.26 thorpej 1136: if (ip_forwsrcrt == 0) {
1137: type = ICMP_UNREACH;
1138: code = ICMP_UNREACH_SRCFAIL;
1139: goto bad;
1140: }
1.329 ozaki-r 1141:
1.339 ozaki-r 1142: rcvif = m_get_rcvif_psref(m, &_psref);
1.330 ozaki-r 1143: if (__predict_false(rcvif == NULL)) {
1144: type = ICMP_UNREACH;
1145: code = ICMP_UNREACH_HOST;
1146: goto bad;
1147: }
1.329 ozaki-r 1148: ip_forward(m, 1, rcvif);
1.339 ozaki-r 1149: m_put_rcvif_psref(rcvif, &_psref);
1.311 rmind 1150: return true;
1.13 mycroft 1151: }
1.311 rmind 1152: return false;
1.1 cgd 1153: bad:
1.13 mycroft 1154: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1155: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1156: return true;
1.1 cgd 1157: }
1158:
1159: /*
1.311 rmind 1160: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1161: * return internet address info of interface to be used to get there.
1162: */
1.311 rmind 1163: static struct in_ifaddr *
1.211 perry 1164: ip_rtaddr(struct in_addr dst)
1.1 cgd 1165: {
1.249 dyoung 1166: struct rtentry *rt;
1167: union {
1168: struct sockaddr dst;
1169: struct sockaddr_in dst4;
1170: } u;
1.340 ozaki-r 1171: struct route *ro;
1.249 dyoung 1172:
1173: sockaddr_in_init(&u.dst4, &dst, 0);
1174:
1.318 rmind 1175: SOFTNET_LOCK();
1.340 ozaki-r 1176: ro = percpu_getref(ipforward_rt_percpu);
1177: rt = rtcache_lookup(ro, &u.dst);
1178: percpu_putref(ipforward_rt_percpu);
1.318 rmind 1179: SOFTNET_UNLOCK();
1180: if (rt == NULL)
1.249 dyoung 1181: return NULL;
1182:
1183: return ifatoia(rt->rt_ifa);
1.1 cgd 1184: }
1185:
1186: /*
1.311 rmind 1187: * save_rte: save incoming source route for use in replies, to be picked
1188: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1189: */
1.311 rmind 1190: static void
1.211 perry 1191: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1192: {
1193: unsigned olen;
1194:
1195: olen = option[IPOPT_OLEN];
1196: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1197: return;
1.281 tsutsui 1198: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1199: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1200: ip_srcrt.dst = dst;
1201: }
1202:
1203: /*
1204: * Retrieve incoming source route for use in replies,
1205: * in the same form used by setsockopt.
1206: * The first hop is placed before the options, will be removed later.
1207: */
1208: struct mbuf *
1.211 perry 1209: ip_srcroute(void)
1.1 cgd 1210: {
1.109 augustss 1211: struct in_addr *p, *q;
1212: struct mbuf *m;
1.1 cgd 1213:
1214: if (ip_nhops == 0)
1.237 dyoung 1215: return NULL;
1.1 cgd 1216: m = m_get(M_DONTWAIT, MT_SOOPTS);
1217: if (m == 0)
1.237 dyoung 1218: return NULL;
1.1 cgd 1219:
1.164 matt 1220: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1221: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1222:
1223: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1224: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1225: OPTSIZ;
1226:
1227: /*
1228: * First save first hop for return route
1229: */
1230: p = &ip_srcrt.route[ip_nhops - 1];
1231: *(mtod(m, struct in_addr *)) = *p--;
1232:
1233: /*
1234: * Copy option fields and padding (nop) to mbuf.
1235: */
1236: ip_srcrt.nop = IPOPT_NOP;
1237: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1238: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1239: OPTSIZ);
1240: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1241: sizeof(struct in_addr) + OPTSIZ);
1242: #undef OPTSIZ
1243: /*
1244: * Record return path as an IP source route,
1245: * reversing the path (pointers are now aligned).
1246: */
1247: while (p >= ip_srcrt.route) {
1248: *q++ = *p--;
1249: }
1250: /*
1251: * Last hop goes to final destination.
1252: */
1253: *q = ip_srcrt.dst;
1254: return (m);
1255: }
1256:
1.139 matt 1257: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1258: [PRC_MSGSIZE] = EMSGSIZE,
1259: [PRC_HOSTDEAD] = EHOSTDOWN,
1260: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1261: [PRC_UNREACH_NET] = EHOSTUNREACH,
1262: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1263: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1264: [PRC_UNREACH_PORT] = ECONNREFUSED,
1265: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1266: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1267: };
1268:
1.295 dyoung 1269: void
1270: ip_fasttimo(void)
1271: {
1272: if (ip_drainwanted) {
1273: ip_drain();
1274: ip_drainwanted = 0;
1275: }
1276: }
1277:
1278: void
1279: ip_drainstub(void)
1280: {
1281: ip_drainwanted = 1;
1282: }
1283:
1.1 cgd 1284: /*
1285: * Forward a packet. If some error occurs return the sender
1286: * an icmp packet. Note we can't always generate a meaningful
1287: * icmp message because icmp doesn't have a large enough repertoire
1288: * of codes and types.
1289: *
1290: * If not forwarding, just drop the packet. This could be confusing
1291: * if ipforwarding was zero but some routing protocol was advancing
1292: * us as a gateway to somewhere. However, we must let the routing
1293: * protocol deal with that.
1294: *
1295: * The srcrt parameter indicates whether the packet is being forwarded
1296: * via a source route.
1297: */
1.313 rmind 1298: static void
1.329 ozaki-r 1299: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1 cgd 1300: {
1.109 augustss 1301: struct ip *ip = mtod(m, struct ip *);
1302: struct rtentry *rt;
1.220 christos 1303: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1304: struct mbuf *mcopy;
1.13 mycroft 1305: n_long dest;
1.249 dyoung 1306: union {
1307: struct sockaddr dst;
1308: struct sockaddr_in dst4;
1309: } u;
1.320 ozaki-r 1310: uint64_t *ips;
1.340 ozaki-r 1311: struct route *ro;
1.164 matt 1312:
1.318 rmind 1313: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1314: "interrupt handler; synchronization assumptions violated");
1315:
1.164 matt 1316: /*
1317: * We are now in the output path.
1318: */
1319: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1320:
1321: /*
1322: * Clear any in-bound checksum flags for this packet.
1323: */
1324: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1325:
1.13 mycroft 1326: dest = 0;
1.93 sommerfe 1327: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1328: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1329: m_freem(m);
1330: return;
1331: }
1.318 rmind 1332:
1333: SOFTNET_LOCK();
1334:
1.1 cgd 1335: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1336: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318 rmind 1337: SOFTNET_UNLOCK();
1.1 cgd 1338: return;
1339: }
1340:
1.249 dyoung 1341: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1342:
1.340 ozaki-r 1343: ro = percpu_getref(ipforward_rt_percpu);
1344: if ((rt = rtcache_lookup(ro, &u.dst)) == NULL) {
1345: percpu_putref(ipforward_rt_percpu);
1.249 dyoung 1346: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318 rmind 1347: SOFTNET_UNLOCK();
1.249 dyoung 1348: return;
1.1 cgd 1349: }
1350:
1351: /*
1.34 mycroft 1352: * Save at most 68 bytes of the packet in case
1.1 cgd 1353: * we need to generate an ICMP message to the src.
1.119 itojun 1354: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1355: */
1.155 itojun 1356: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1357: if (mcopy)
1358: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1359:
1.221 christos 1360: ip->ip_ttl -= IPTTLDEC;
1361:
1.1 cgd 1362: /*
1363: * If forwarding packet using same interface that it came in on,
1364: * perhaps should send a redirect to sender to shortcut a hop.
1365: * Only send redirect if source is sending directly to us,
1366: * and if packet was not source routed (or has any options).
1367: * Also, don't send redirect if forwarding using a default route
1368: * or a route modified by a redirect.
1369: */
1.329 ozaki-r 1370: if (rt->rt_ifp == rcvif &&
1.1 cgd 1371: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1372: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1373: ipsendredirects && !srcrt) {
1.19 mycroft 1374: if (rt->rt_ifa &&
1375: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1376: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1377: if (rt->rt_flags & RTF_GATEWAY)
1378: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1379: else
1380: dest = ip->ip_dst.s_addr;
1381: /*
1382: * Router requirements says to only send host
1383: * redirects.
1384: */
1385: type = ICMP_REDIRECT;
1386: code = ICMP_REDIRECT_HOST;
1.1 cgd 1387: }
1388: }
1389:
1.340 ozaki-r 1390: error = ip_output(m, NULL, ro,
1.173 jonathan 1391: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1392: NULL, NULL);
1.173 jonathan 1393:
1.320 ozaki-r 1394: if (error) {
1.266 thorpej 1395: IP_STATINC(IP_STAT_CANTFORWARD);
1.320 ozaki-r 1396: goto error;
1397: }
1398:
1399: ips = IP_STAT_GETREF();
1400: ips[IP_STAT_FORWARD]++;
1401:
1402: if (type) {
1403: ips[IP_STAT_REDIRECTSENT]++;
1404: IP_STAT_PUTREF();
1405: goto redirect;
1406: }
1407:
1408: IP_STAT_PUTREF();
1409: if (mcopy) {
1.63 matt 1410: #ifdef GATEWAY
1.320 ozaki-r 1411: if (mcopy->m_flags & M_CANFASTFWD)
1.340 ozaki-r 1412: ipflow_create(ro, mcopy);
1.63 matt 1413: #endif
1.320 ozaki-r 1414: m_freem(mcopy);
1.1 cgd 1415: }
1.320 ozaki-r 1416:
1.340 ozaki-r 1417: percpu_putref(ipforward_rt_percpu);
1.320 ozaki-r 1418: SOFTNET_UNLOCK();
1419: return;
1420:
1421: redirect:
1422: error:
1.318 rmind 1423: if (mcopy == NULL) {
1.340 ozaki-r 1424: percpu_putref(ipforward_rt_percpu);
1.318 rmind 1425: SOFTNET_UNLOCK();
1.1 cgd 1426: return;
1.318 rmind 1427: }
1.13 mycroft 1428:
1.1 cgd 1429: switch (error) {
1430:
1431: case 0: /* forwarded, but need redirect */
1432: /* type, code set above */
1433: break;
1434:
1435: case ENETUNREACH: /* shouldn't happen, checked above */
1436: case EHOSTUNREACH:
1437: case ENETDOWN:
1438: case EHOSTDOWN:
1439: default:
1440: type = ICMP_UNREACH;
1441: code = ICMP_UNREACH_HOST;
1442: break;
1443:
1444: case EMSGSIZE:
1445: type = ICMP_UNREACH;
1446: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1447:
1.340 ozaki-r 1448: if ((rt = rtcache_validate(ro)) != NULL)
1.274 seanb 1449: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1450: #ifdef IPSEC
1.317 christos 1451: if (ipsec_used)
1452: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1453: #endif
1.266 thorpej 1454: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1455: break;
1456:
1457: case ENOBUFS:
1.143 itojun 1458: /*
1.311 rmind 1459: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
1460: * Requirements for IP Version 4 Routers. Source quench can
1461: * big problem under DoS attacks or if the underlying
1462: * interface is rate-limited.
1.143 itojun 1463: */
1464: if (mcopy)
1465: m_freem(mcopy);
1.340 ozaki-r 1466: percpu_putref(ipforward_rt_percpu);
1.318 rmind 1467: SOFTNET_UNLOCK();
1.143 itojun 1468: return;
1.1 cgd 1469: }
1.220 christos 1470: icmp_error(mcopy, type, code, dest, destmtu);
1.340 ozaki-r 1471: percpu_putref(ipforward_rt_percpu);
1.318 rmind 1472: SOFTNET_UNLOCK();
1.44 thorpej 1473: }
1474:
1475: void
1.211 perry 1476: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1477: struct mbuf *m)
1.44 thorpej 1478: {
1.311 rmind 1479: struct socket *so = inp->inp_socket;
1.329 ozaki-r 1480: ifnet_t *ifp;
1.311 rmind 1481: int inpflags = inp->inp_flags;
1.329 ozaki-r 1482: struct psref psref;
1.44 thorpej 1483:
1.329 ozaki-r 1484: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 1485: if (__predict_false(ifp == NULL))
1486: return; /* XXX should report error? */
1487:
1.311 rmind 1488: if (so->so_options & SO_TIMESTAMP
1.278 christos 1489: #ifdef SO_OTIMESTAMP
1.311 rmind 1490: || so->so_options & SO_OTIMESTAMP
1.278 christos 1491: #endif
1492: ) {
1.44 thorpej 1493: struct timeval tv;
1494:
1495: microtime(&tv);
1.278 christos 1496: #ifdef SO_OTIMESTAMP
1.311 rmind 1497: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1498: struct timeval50 tv50;
1499: timeval_to_timeval50(&tv, &tv50);
1500: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1501: SCM_OTIMESTAMP, SOL_SOCKET);
1502: } else
1503: #endif
1.244 christos 1504: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1505: SCM_TIMESTAMP, SOL_SOCKET);
1506: if (*mp)
1507: mp = &(*mp)->m_next;
1508: }
1.311 rmind 1509: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1510: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1511: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1512: if (*mp)
1513: mp = &(*mp)->m_next;
1514: }
1.311 rmind 1515: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1516: struct in_pktinfo ipi;
1.307 christos 1517: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1518: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1519: *mp = sbcreatecontrol((void *) &ipi,
1520: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1521: if (*mp)
1522: mp = &(*mp)->m_next;
1523: }
1.311 rmind 1524: if (inpflags & INP_PKTINFO) {
1.306 christos 1525: struct in_pktinfo ipi;
1.307 christos 1526: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1527: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1528: *mp = sbcreatecontrol((void *) &ipi,
1529: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1530: if (*mp)
1531: mp = &(*mp)->m_next;
1532: }
1.311 rmind 1533: if (inpflags & INP_RECVIF) {
1.44 thorpej 1534: struct sockaddr_dl sdl;
1535:
1.337 ozaki-r 1536: sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
1537: NULL, 0);
1.251 dyoung 1538: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1539: if (*mp)
1540: mp = &(*mp)->m_next;
1541: }
1.311 rmind 1542: if (inpflags & INP_RECVTTL) {
1.282 minskim 1543: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1544: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1545: if (*mp)
1546: mp = &(*mp)->m_next;
1547: }
1.329 ozaki-r 1548: m_put_rcvif_psref(ifp, &psref);
1.13 mycroft 1549: }
1550:
1.189 atatat 1551: /*
1.228 elad 1552: * sysctl helper routine for net.inet.ip.forwsrcrt.
1553: */
1554: static int
1555: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1556: {
1557: int error, tmp;
1558: struct sysctlnode node;
1559:
1560: node = *rnode;
1561: tmp = ip_forwsrcrt;
1562: node.sysctl_data = &tmp;
1563: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1564: if (error || newp == NULL)
1565: return (error);
1566:
1.280 elad 1567: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1568: 0, NULL, NULL, NULL);
1569: if (error)
1570: return (error);
1.228 elad 1571:
1572: ip_forwsrcrt = tmp;
1573:
1574: return (0);
1575: }
1576:
1577: /*
1.189 atatat 1578: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1579: * range of the new value and tweaks timers if it changes.
1580: */
1581: static int
1582: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1583: {
1.189 atatat 1584: int error, tmp;
1585: struct sysctlnode node;
1586:
1587: node = *rnode;
1588: tmp = ip_mtudisc_timeout;
1589: node.sysctl_data = &tmp;
1590: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1591: if (error || newp == NULL)
1592: return (error);
1593: if (tmp < 0)
1594: return (EINVAL);
1.52 thorpej 1595:
1.273 matt 1596: mutex_enter(softnet_lock);
1597:
1.189 atatat 1598: ip_mtudisc_timeout = tmp;
1599: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1600:
1.273 matt 1601: mutex_exit(softnet_lock);
1602:
1.189 atatat 1603: return (0);
1604: }
1.54 lukem 1605:
1.266 thorpej 1606: static int
1607: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1608: {
1609:
1.271 thorpej 1610: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1611: }
1.131 itojun 1612:
1.284 pooka 1613: static void
1614: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1615: {
1.197 atatat 1616: sysctl_createv(clog, 0, NULL, NULL,
1617: CTLFLAG_PERMANENT,
1.203 atatat 1618: CTLTYPE_NODE, "inet",
1619: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1620: NULL, 0, NULL, 0,
1621: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1622: sysctl_createv(clog, 0, NULL, NULL,
1623: CTLFLAG_PERMANENT,
1.203 atatat 1624: CTLTYPE_NODE, "ip",
1625: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1626: NULL, 0, NULL, 0,
1627: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1628:
1.197 atatat 1629: sysctl_createv(clog, 0, NULL, NULL,
1630: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1631: CTLTYPE_INT, "forwarding",
1632: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1633: NULL, 0, &ipforwarding, 0,
1634: CTL_NET, PF_INET, IPPROTO_IP,
1635: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1636: sysctl_createv(clog, 0, NULL, NULL,
1637: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1638: CTLTYPE_INT, "redirect",
1639: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1640: NULL, 0, &ipsendredirects, 0,
1641: CTL_NET, PF_INET, IPPROTO_IP,
1642: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1643: sysctl_createv(clog, 0, NULL, NULL,
1644: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1645: CTLTYPE_INT, "ttl",
1646: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1647: NULL, 0, &ip_defttl, 0,
1648: CTL_NET, PF_INET, IPPROTO_IP,
1649: IPCTL_DEFTTL, CTL_EOL);
1650: #ifdef IPCTL_DEFMTU
1.197 atatat 1651: sysctl_createv(clog, 0, NULL, NULL,
1652: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1653: CTLTYPE_INT, "mtu",
1654: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1655: NULL, 0, &ip_mtu, 0,
1656: CTL_NET, PF_INET, IPPROTO_IP,
1657: IPCTL_DEFMTU, CTL_EOL);
1658: #endif /* IPCTL_DEFMTU */
1.197 atatat 1659: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1660: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1661: CTLTYPE_INT, "forwsrcrt",
1662: SYSCTL_DESCR("Enable forwarding of source-routed "
1663: "datagrams"),
1.228 elad 1664: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1665: CTL_NET, PF_INET, IPPROTO_IP,
1666: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1667: sysctl_createv(clog, 0, NULL, NULL,
1668: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1669: CTLTYPE_INT, "directed-broadcast",
1670: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1671: NULL, 0, &ip_directedbcast, 0,
1672: CTL_NET, PF_INET, IPPROTO_IP,
1673: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1674: sysctl_createv(clog, 0, NULL, NULL,
1675: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1676: CTLTYPE_INT, "allowsrcrt",
1677: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1678: NULL, 0, &ip_allowsrcrt, 0,
1679: CTL_NET, PF_INET, IPPROTO_IP,
1680: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1681:
1.197 atatat 1682: sysctl_createv(clog, 0, NULL, NULL,
1683: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1684: CTLTYPE_INT, "mtudisc",
1685: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1686: NULL, 0, &ip_mtudisc, 0,
1687: CTL_NET, PF_INET, IPPROTO_IP,
1688: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1689: sysctl_createv(clog, 0, NULL, NULL,
1690: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1691: CTLTYPE_INT, "anonportmin",
1692: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1693: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1694: CTL_NET, PF_INET, IPPROTO_IP,
1695: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1696: sysctl_createv(clog, 0, NULL, NULL,
1697: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1698: CTLTYPE_INT, "anonportmax",
1699: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1700: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1701: CTL_NET, PF_INET, IPPROTO_IP,
1702: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1703: sysctl_createv(clog, 0, NULL, NULL,
1704: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1705: CTLTYPE_INT, "mtudisctimeout",
1706: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1707: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1708: CTL_NET, PF_INET, IPPROTO_IP,
1709: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1710: #ifndef IPNOPRIVPORTS
1.197 atatat 1711: sysctl_createv(clog, 0, NULL, NULL,
1712: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1713: CTLTYPE_INT, "lowportmin",
1714: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1715: "to assign"),
1.189 atatat 1716: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1717: CTL_NET, PF_INET, IPPROTO_IP,
1718: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1719: sysctl_createv(clog, 0, NULL, NULL,
1720: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1721: CTLTYPE_INT, "lowportmax",
1722: SYSCTL_DESCR("Highest privileged ephemeral port number "
1723: "to assign"),
1.189 atatat 1724: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1725: CTL_NET, PF_INET, IPPROTO_IP,
1726: IPCTL_LOWPORTMAX, CTL_EOL);
1727: #endif /* IPNOPRIVPORTS */
1728: #if NGRE > 0
1.197 atatat 1729: sysctl_createv(clog, 0, NULL, NULL,
1730: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1731: CTLTYPE_INT, "grettl",
1732: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1733: NULL, 0, &ip_gre_ttl, 0,
1734: CTL_NET, PF_INET, IPPROTO_IP,
1735: IPCTL_GRE_TTL, CTL_EOL);
1736: #endif /* NGRE */
1.197 atatat 1737: sysctl_createv(clog, 0, NULL, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1739: CTLTYPE_INT, "checkinterface",
1740: SYSCTL_DESCR("Enable receive side of Strong ES model "
1741: "from RFC1122"),
1.189 atatat 1742: NULL, 0, &ip_checkinterface, 0,
1743: CTL_NET, PF_INET, IPPROTO_IP,
1744: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1745: sysctl_createv(clog, 0, NULL, NULL,
1746: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1747: CTLTYPE_INT, "random_id",
1748: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1749: NULL, 0, &ip_do_randomid, 0,
1750: CTL_NET, PF_INET, IPPROTO_IP,
1751: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1752: sysctl_createv(clog, 0, NULL, NULL,
1753: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1754: CTLTYPE_INT, "do_loopback_cksum",
1755: SYSCTL_DESCR("Perform IP checksum on loopback"),
1756: NULL, 0, &ip_do_loopback_cksum, 0,
1757: CTL_NET, PF_INET, IPPROTO_IP,
1758: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1759: sysctl_createv(clog, 0, NULL, NULL,
1760: CTLFLAG_PERMANENT,
1761: CTLTYPE_STRUCT, "stats",
1762: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1763: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1764: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1765: CTL_EOL);
1.322 joerg 1766: #if NARP
1.321 roy 1767: sysctl_createv(clog, 0, NULL, NULL,
1768: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1769: CTLTYPE_INT, "dad_count",
1770: SYSCTL_DESCR("Number of Duplicate Address Detection "
1771: "probes to send"),
1772: NULL, 0, &ip_dad_count, 0,
1773: CTL_NET, PF_INET, IPPROTO_IP,
1774: IPCTL_DAD_COUNT, CTL_EOL);
1.322 joerg 1775: #endif
1.301 christos 1776:
1777: /* anonportalgo RFC6056 subtree */
1.302 christos 1778: const struct sysctlnode *portalgo_node;
1779: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1780: CTLFLAG_PERMANENT,
1781: CTLTYPE_NODE, "anonportalgo",
1782: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1783: NULL, 0, NULL, 0,
1784: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1785: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1786: CTLFLAG_PERMANENT,
1787: CTLTYPE_STRING, "available",
1788: SYSCTL_DESCR("available algorithms"),
1.302 christos 1789: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1790: CTL_CREATE, CTL_EOL);
1.302 christos 1791: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1792: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1793: CTLTYPE_STRING, "selected",
1794: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1795: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1796: CTL_CREATE, CTL_EOL);
1797: sysctl_createv(clog, 0, &portalgo_node, NULL,
1798: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1799: CTLTYPE_STRUCT, "reserve",
1800: SYSCTL_DESCR("bitmap of reserved ports"),
1801: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1802: CTL_CREATE, CTL_EOL);
1.1 cgd 1803: }
1.266 thorpej 1804:
1805: void
1806: ip_statinc(u_int stat)
1807: {
1808:
1809: KASSERT(stat < IP_NSTATS);
1810: IP_STATINC(stat);
1811: }
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