Annotation of src/sys/netinet/ip_input.c, Revision 1.333
1.333 ! ozaki-r 1: /* $NetBSD: ip_input.c,v 1.332 2016/06/30 06:56:27 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>
1.333 ! ozaki-r 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.332 2016/06/30 06:56:27 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:
228: static struct route ipforward_rt __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);
1.1 cgd 348: }
349:
1.333 ! ozaki-r 350: static struct in_ifaddr *
! 351: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
! 352: {
! 353: struct in_ifaddr *ia = NULL;
! 354: int checkif;
! 355:
! 356: /*
! 357: * Enable a consistency check between the destination address
! 358: * and the arrival interface for a unicast packet (the RFC 1122
! 359: * strong ES model) if IP forwarding is disabled and the packet
! 360: * is not locally generated.
! 361: *
! 362: * XXX - Checking also should be disabled if the destination
! 363: * address is ipnat'ed to a different interface.
! 364: *
! 365: * XXX - Checking is incompatible with IP aliases added
! 366: * to the loopback interface instead of the interface where
! 367: * the packets are received.
! 368: *
! 369: * XXX - We need to add a per ifaddr flag for this so that
! 370: * we get finer grain control.
! 371: */
! 372: checkif = ip_checkinterface && (ipforwarding == 0) &&
! 373: (ifp->if_flags & IFF_LOOPBACK) == 0;
! 374:
! 375: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
! 376: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
! 377: if (ia->ia4_flags & IN_IFF_NOTREADY)
! 378: continue;
! 379: if (checkif && ia->ia_ifp != ifp)
! 380: continue;
! 381: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
! 382: break;
! 383: else
! 384: downmatch++;
! 385: }
! 386: }
! 387:
! 388: return ia;
! 389: }
! 390:
! 391: static struct in_ifaddr *
! 392: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
! 393: {
! 394: struct in_ifaddr *ia = NULL;
! 395: struct ifaddr *ifa;
! 396:
! 397: IFADDR_FOREACH(ifa, ifp) {
! 398: if (ifa->ifa_addr->sa_family != AF_INET)
! 399: continue;
! 400: ia = ifatoia(ifa);
! 401: if (ia->ia4_flags & IN_IFF_NOTREADY)
! 402: continue;
! 403: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
! 404: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
! 405: /*
! 406: * Look for all-0's host part (old broadcast addr),
! 407: * either for subnet or net.
! 408: */
! 409: ip->ip_dst.s_addr == ia->ia_subnet ||
! 410: ip->ip_dst.s_addr == ia->ia_net)
! 411: goto matched;
! 412: /*
! 413: * An interface with IP address zero accepts
! 414: * all packets that arrive on that interface.
! 415: */
! 416: if (in_nullhost(ia->ia_addr.sin_addr))
! 417: goto matched;
! 418: }
! 419: ia = NULL;
! 420:
! 421: matched:
! 422: return ia;
! 423: }
! 424:
1.1 cgd 425: /*
1.318 rmind 426: * IP software interrupt routine.
1.89 itojun 427: */
1.318 rmind 428: static void
429: ipintr(void *arg __unused)
1.89 itojun 430: {
431: struct mbuf *m;
1.286 tls 432:
1.318 rmind 433: KASSERT(cpu_softintr_p());
1.89 itojun 434:
1.268 ad 435: mutex_enter(softnet_lock);
1.318 rmind 436: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 437: ip_input(m);
438: }
1.268 ad 439: mutex_exit(softnet_lock);
1.89 itojun 440: }
441:
442: /*
1.318 rmind 443: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 444: * try to reassemble. Process options. Pass to next level.
445: */
1.312 rmind 446: static void
1.89 itojun 447: ip_input(struct mbuf *m)
1.1 cgd 448: {
1.109 augustss 449: struct ip *ip = NULL;
450: struct in_ifaddr *ia;
1.288 rmind 451: int hlen = 0, len;
1.100 itojun 452: int downmatch;
1.169 itojun 453: int srcrt = 0;
1.314 rmind 454: ifnet_t *ifp;
1.329 ozaki-r 455: struct psref psref;
1.1 cgd 456:
1.318 rmind 457: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
458: "interrupt handler; synchronization assumptions violated");
459:
1.164 matt 460: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 461: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329 ozaki-r 462:
463: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 464: if (__predict_false(ifp == NULL))
1.332 ozaki-r 465: goto out;
1.164 matt 466:
1.1 cgd 467: /*
468: * If no IP addresses have been set yet but the interfaces
469: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 470: * Note: we pre-check without locks held.
1.1 cgd 471: */
1.318 rmind 472: if (!TAILQ_FIRST(&in_ifaddrhead)) {
1.332 ozaki-r 473: goto out;
1.318 rmind 474: }
1.266 thorpej 475: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 476:
1.154 thorpej 477: /*
478: * If the IP header is not aligned, slurp it up into a new
479: * mbuf with space for link headers, in the event we forward
480: * it. Otherwise, if it is aligned, make sure the entire
481: * base IP header is in the first mbuf of the chain.
482: */
1.244 christos 483: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 484: if ((m = m_copyup(m, sizeof(struct ip),
485: (max_linkhdr + 3) & ~3)) == NULL) {
486: /* XXXJRT new stat, please */
1.266 thorpej 487: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 488: goto out;
1.154 thorpej 489: }
490: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
491: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 492: IP_STATINC(IP_STAT_TOOSMALL);
1.329 ozaki-r 493: goto out;
1.154 thorpej 494: }
1.1 cgd 495: }
496: ip = mtod(m, struct ip *);
1.13 mycroft 497: if (ip->ip_v != IPVERSION) {
1.266 thorpej 498: IP_STATINC(IP_STAT_BADVERS);
1.332 ozaki-r 499: goto out;
1.13 mycroft 500: }
1.1 cgd 501: hlen = ip->ip_hl << 2;
502: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 503: IP_STATINC(IP_STAT_BADHLEN);
1.332 ozaki-r 504: goto out;
1.1 cgd 505: }
506: if (hlen > m->m_len) {
1.298 liamjfoy 507: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 508: IP_STATINC(IP_STAT_BADHLEN);
1.329 ozaki-r 509: goto out;
1.1 cgd 510: }
511: ip = mtod(m, struct ip *);
512: }
1.98 thorpej 513:
1.85 hwr 514: /*
1.99 thorpej 515: * RFC1122: packets with a multicast source address are
1.98 thorpej 516: * not allowed.
1.85 hwr 517: */
518: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 519: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 520: goto out;
1.129 itojun 521: }
522:
523: /* 127/8 must not appear on wire - RFC1122 */
524: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
525: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314 rmind 526: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 527: IP_STATINC(IP_STAT_BADADDR);
1.332 ozaki-r 528: goto out;
1.130 itojun 529: }
1.85 hwr 530: }
531:
1.135 thorpej 532: switch (m->m_pkthdr.csum_flags &
1.314 rmind 533: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 534: M_CSUM_IPv4_BAD)) {
535: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
536: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332 ozaki-r 537: IP_STATINC(IP_STAT_BADSUM);
538: goto out;
1.135 thorpej 539:
540: case M_CSUM_IPv4:
541: /* Checksum was okay. */
542: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
543: break;
544:
545: default:
1.206 thorpej 546: /*
547: * Must compute it ourselves. Maybe skip checksum on
548: * loopback interfaces.
549: */
1.314 rmind 550: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
551: ip_do_loopback_cksum)) {
1.206 thorpej 552: INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332 ozaki-r 553: if (in_cksum(m, hlen) != 0) {
554: IP_STATINC(IP_STAT_BADSUM);
555: goto out;
556: }
1.206 thorpej 557: }
1.135 thorpej 558: break;
1.1 cgd 559: }
560:
1.121 thorpej 561: /* Retrieve the packet length. */
562: len = ntohs(ip->ip_len);
1.81 proff 563:
564: /*
565: * Check for additional length bogosity
566: */
1.84 proff 567: if (len < hlen) {
1.266 thorpej 568: IP_STATINC(IP_STAT_BADLEN);
1.332 ozaki-r 569: goto out;
1.81 proff 570: }
1.1 cgd 571:
572: /*
573: * Check that the amount of data in the buffers
574: * is as at least much as the IP header would have us expect.
575: * Trim mbufs if longer than we expect.
576: * Drop packet if shorter than we expect.
577: */
1.35 mycroft 578: if (m->m_pkthdr.len < len) {
1.266 thorpej 579: IP_STATINC(IP_STAT_TOOSHORT);
1.332 ozaki-r 580: goto out;
1.1 cgd 581: }
1.35 mycroft 582: if (m->m_pkthdr.len > len) {
1.1 cgd 583: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 584: m->m_len = len;
585: m->m_pkthdr.len = len;
1.1 cgd 586: } else
1.35 mycroft 587: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 588: }
589:
1.64 thorpej 590: /*
591: * Assume that we can create a fast-forward IP flow entry
592: * based on this packet.
593: */
594: m->m_flags |= M_CANFASTFWD;
595:
1.33 mrg 596: /*
1.64 thorpej 597: * Run through list of hooks for input packets. If there are any
598: * filters which require that additional packets in the flow are
599: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
600: * Note that filters must _never_ set this flag, as another filter
601: * in the list may have previously cleared it.
1.33 mrg 602: */
1.304 christos 603: #if defined(IPSEC)
1.317 christos 604: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 605: #else
606: if (1)
607: #endif
608: {
1.314 rmind 609: struct in_addr odst = ip->ip_dst;
1.318 rmind 610: bool freed;
1.169 itojun 611:
1.318 rmind 612: SOFTNET_LOCK();
613: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
614: SOFTNET_UNLOCK();
615: if (freed || m == NULL) {
1.329 ozaki-r 616: goto out;
1.318 rmind 617: }
1.127 itojun 618: ip = mtod(m, struct ip *);
1.142 darrenr 619: hlen = ip->ip_hl << 2;
1.318 rmind 620:
1.205 darrenr 621: /*
622: * XXX The setting of "srcrt" here is to prevent ip_forward()
623: * from generating ICMP redirects for packets that have
624: * been redirected by a hook back out on to the same LAN that
625: * they came from and is not an indication that the packet
626: * is being inffluenced by source routing options. This
627: * allows things like
628: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
629: * where tlp0 is both on the 1.1.1.0/24 network and is the
630: * default route for hosts on 1.1.1.0/24. Of course this
631: * also requires a "map tlp0 ..." to complete the story.
632: * One might argue whether or not this kind of network config.
1.212 perry 633: * should be supported in this manner...
1.205 darrenr 634: */
1.169 itojun 635: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 636: }
1.123 thorpej 637:
638: #ifdef ALTQ
639: /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318 rmind 640: if (altq_input) {
641: SOFTNET_LOCK();
642: if ((*altq_input)(m, AF_INET) == 0) {
643: /* Packet dropped by traffic conditioner. */
644: SOFTNET_UNLOCK();
1.329 ozaki-r 645: goto out;
1.318 rmind 646: }
647: SOFTNET_UNLOCK();
1.123 thorpej 648: }
649: #endif
1.121 thorpej 650:
651: /*
1.1 cgd 652: * Process options and, if not destined for us,
653: * ship it on. ip_dooptions returns 1 when an
654: * error was detected (causing an icmp message
655: * to be sent and the original packet to be freed).
656: */
657: ip_nhops = 0; /* for source routed packets */
658: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.329 ozaki-r 659: goto out;
1.1 cgd 660:
661: /*
662: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 663: *
664: * Traditional 4.4BSD did not consult IFF_UP at all.
665: * The behavior here is to treat addresses on !IFF_UP interface
1.321 roy 666: * or IN_IFF_NOTREADY addresses as not mine.
1.1 cgd 667: */
1.100 itojun 668: downmatch = 0;
1.333 ! ozaki-r 669: ia = ip_match_our_address(ifp, ip, &downmatch);
1.86 thorpej 670: if (ia != NULL)
671: goto ours;
1.333 ! ozaki-r 672:
1.315 christos 673: if (ifp->if_flags & IFF_BROADCAST) {
1.333 ! ozaki-r 674: ia = ip_match_our_address_broadcast(ifp, ip);
! 675: if (ia != NULL)
! 676: goto ours;
1.1 cgd 677: }
1.333 ! ozaki-r 678:
1.18 mycroft 679: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 680: #ifdef MROUTING
681: extern struct socket *ip_mrouter;
1.10 brezak 682:
1.4 hpeyerl 683: if (ip_mrouter) {
684: /*
685: * If we are acting as a multicast router, all
686: * incoming multicast packets are passed to the
687: * kernel-level multicast forwarding function.
688: * The packet is returned (relatively) intact; if
689: * ip_mforward() returns a non-zero value, the packet
690: * must be discarded, else it may be accepted below.
691: *
692: * (The IP ident field is put in the same byte order
693: * as expected when ip_mforward() is called from
694: * ip_output().)
695: */
1.318 rmind 696: SOFTNET_LOCK();
1.314 rmind 697: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 698: SOFTNET_UNLOCK();
1.266 thorpej 699: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 700: goto out;
1.4 hpeyerl 701: }
1.318 rmind 702: SOFTNET_UNLOCK();
1.4 hpeyerl 703:
704: /*
705: * The process-level routing demon needs to receive
706: * all multicast IGMP packets, whether or not this
707: * host belongs to their destination groups.
708: */
1.318 rmind 709: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 710: goto ours;
1.318 rmind 711: }
1.266 thorpej 712: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 713: }
714: #endif
715: /*
716: * See if we belong to the destination multicast group on the
717: * arrival interface.
718: */
1.316 rmind 719: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 720: IP_STATINC(IP_STAT_CANTFORWARD);
1.332 ozaki-r 721: goto out;
1.4 hpeyerl 722: }
723: goto ours;
724: }
1.19 mycroft 725: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 726: in_nullhost(ip->ip_dst))
1.1 cgd 727: goto ours;
728:
729: /*
730: * Not for us; forward if possible and desirable.
731: */
732: if (ipforwarding == 0) {
1.329 ozaki-r 733: m_put_rcvif_psref(ifp, &psref);
1.266 thorpej 734: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 735: m_freem(m);
1.100 itojun 736: } else {
737: /*
738: * If ip_dst matched any of my address on !IFF_UP interface,
739: * and there's no IFF_UP interface that matches ip_dst,
740: * send icmp unreach. Forwarding it will result in in-kernel
741: * forwarding loop till TTL goes to 0.
742: */
743: if (downmatch) {
1.329 ozaki-r 744: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 745: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 746: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 747: return;
748: }
1.304 christos 749: #ifdef IPSEC
1.305 rmind 750: /* Perform IPsec, if any. */
1.318 rmind 751: if (ipsec_used) {
752: SOFTNET_LOCK();
753: if (ipsec4_input(m, IP_FORWARDING |
754: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
755: SOFTNET_UNLOCK();
1.332 ozaki-r 756: goto out;
1.318 rmind 757: }
758: SOFTNET_UNLOCK();
1.173 jonathan 759: }
1.305 rmind 760: #endif
1.329 ozaki-r 761: ip_forward(m, srcrt, ifp);
762: m_put_rcvif_psref(ifp, &psref);
1.100 itojun 763: }
1.89 itojun 764: return;
1.1 cgd 765:
766: ours:
1.329 ozaki-r 767: m_put_rcvif_psref(ifp, &psref);
1.331 ozaki-r 768: ifp = NULL;
1.329 ozaki-r 769:
1.1 cgd 770: /*
771: * If offset or IP_MF are set, must reassemble.
772: */
1.155 itojun 773: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 774: /*
775: * Pass to IP reassembly mechanism.
776: */
1.290 rmind 777: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 778: /* Failed; invalid fragment(s) or packet. */
1.332 ozaki-r 779: goto out;
1.16 cgd 780: }
1.290 rmind 781: if (m == NULL) {
1.289 rmind 782: /* More fragments should come; silently return. */
1.332 ozaki-r 783: goto out;
1.289 rmind 784: }
1.290 rmind 785: /*
786: * Reassembly is done, we have the final packet.
787: * Updated cached data in local variable(s).
788: */
1.289 rmind 789: ip = mtod(m, struct ip *);
790: hlen = ip->ip_hl << 2;
1.79 mycroft 791: }
1.128 itojun 792:
1.304 christos 793: #ifdef IPSEC
1.173 jonathan 794: /*
1.305 rmind 795: * Enforce IPsec policy checking if we are seeing last header.
796: * Note that we do not visit this with protocols with PCB layer
797: * code - like UDP/TCP/raw IP.
1.173 jonathan 798: */
1.317 christos 799: if (ipsec_used &&
1.328 riastrad 800: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318 rmind 801: SOFTNET_LOCK();
1.305 rmind 802: if (ipsec4_input(m, 0) != 0) {
1.318 rmind 803: SOFTNET_UNLOCK();
1.332 ozaki-r 804: goto out;
1.173 jonathan 805: }
1.318 rmind 806: SOFTNET_UNLOCK();
1.173 jonathan 807: }
1.305 rmind 808: #endif
1.1 cgd 809:
810: /*
811: * Switch out to protocol's input routine.
812: */
1.82 aidan 813: #if IFA_STATS
1.122 itojun 814: if (ia && ip)
1.155 itojun 815: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 816: #endif
1.266 thorpej 817: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 818:
1.318 rmind 819: const int off = hlen, nh = ip->ip_p;
820:
821: SOFTNET_LOCK();
1.328 riastrad 822: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318 rmind 823: SOFTNET_UNLOCK();
1.89 itojun 824: return;
1.135 thorpej 825:
1.329 ozaki-r 826: out:
827: m_put_rcvif_psref(ifp, &psref);
1.332 ozaki-r 828: if (m != NULL)
829: m_freem(m);
1.1 cgd 830: }
831:
832: /*
1.288 rmind 833: * IP timer processing.
1.1 cgd 834: */
1.8 mycroft 835: void
1.211 perry 836: ip_slowtimo(void)
1.1 cgd 837: {
1.268 ad 838:
839: mutex_enter(softnet_lock);
840: KERNEL_LOCK(1, NULL);
1.1 cgd 841:
1.288 rmind 842: ip_reass_slowtimo();
1.268 ad 843:
844: KERNEL_UNLOCK_ONE(NULL);
845: mutex_exit(softnet_lock);
1.1 cgd 846: }
847:
848: /*
1.288 rmind 849: * IP drain processing.
1.1 cgd 850: */
1.8 mycroft 851: void
1.211 perry 852: ip_drain(void)
1.1 cgd 853: {
854:
1.268 ad 855: KERNEL_LOCK(1, NULL);
1.288 rmind 856: ip_reass_drain();
1.268 ad 857: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 858: }
859:
860: /*
1.311 rmind 861: * ip_dooptions: perform option processing on a datagram, possibly discarding
862: * it if bad options are encountered, or forwarding it if source-routed.
863: *
864: * => Returns true if packet has been forwarded/freed.
865: * => Returns false if the packet should be processed further.
1.1 cgd 866: */
1.311 rmind 867: static bool
1.211 perry 868: ip_dooptions(struct mbuf *m)
1.1 cgd 869: {
1.109 augustss 870: struct ip *ip = mtod(m, struct ip *);
871: u_char *cp, *cp0;
872: struct ip_timestamp *ipt;
873: struct in_ifaddr *ia;
1.1 cgd 874: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 875: struct in_addr dst;
1.1 cgd 876: n_time ntime;
877:
1.13 mycroft 878: dst = ip->ip_dst;
1.1 cgd 879: cp = (u_char *)(ip + 1);
880: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
881: for (; cnt > 0; cnt -= optlen, cp += optlen) {
882: opt = cp[IPOPT_OPTVAL];
883: if (opt == IPOPT_EOL)
884: break;
885: if (opt == IPOPT_NOP)
886: optlen = 1;
887: else {
1.113 itojun 888: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
889: code = &cp[IPOPT_OLEN] - (u_char *)ip;
890: goto bad;
891: }
1.1 cgd 892: optlen = cp[IPOPT_OLEN];
1.114 itojun 893: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 894: code = &cp[IPOPT_OLEN] - (u_char *)ip;
895: goto bad;
896: }
897: }
898: switch (opt) {
899:
900: default:
901: break;
902:
903: /*
904: * Source routing with record.
905: * Find interface with current destination address.
906: * If none on this machine then drop if strictly routed,
907: * or do nothing if loosely routed.
908: * Record interface address and bring up next address
909: * component. If strictly routed make sure next
910: * address is on directly accessible net.
911: */
912: case IPOPT_LSRR:
913: case IPOPT_SSRR:
1.47 cjs 914: if (ip_allowsrcrt == 0) {
915: type = ICMP_UNREACH;
916: code = ICMP_UNREACH_NET_PROHIB;
917: goto bad;
918: }
1.114 itojun 919: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
920: code = &cp[IPOPT_OLEN] - (u_char *)ip;
921: goto bad;
922: }
1.1 cgd 923: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
924: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
925: goto bad;
926: }
927: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 928: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 929: if (ia == 0) {
930: if (opt == IPOPT_SSRR) {
931: type = ICMP_UNREACH;
932: code = ICMP_UNREACH_SRCFAIL;
933: goto bad;
934: }
935: /*
936: * Loose routing, and not at next destination
937: * yet; nothing to do except forward.
938: */
939: break;
940: }
941: off--; /* 0 origin */
1.112 sommerfe 942: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 943: /*
944: * End of source route. Should be for us.
945: */
946: save_rte(cp, ip->ip_src);
947: break;
948: }
949: /*
950: * locate outgoing interface
951: */
1.281 tsutsui 952: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 953: sizeof(ipaddr.sin_addr));
1.96 thorpej 954: if (opt == IPOPT_SSRR)
1.196 itojun 955: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 956: else
1.1 cgd 957: ia = ip_rtaddr(ipaddr.sin_addr);
958: if (ia == 0) {
959: type = ICMP_UNREACH;
960: code = ICMP_UNREACH_SRCFAIL;
961: goto bad;
962: }
963: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 964: bcopy((void *)&ia->ia_addr.sin_addr,
965: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 966: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 967: /*
968: * Let ip_intr's mcast routing check handle mcast pkts
969: */
1.18 mycroft 970: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 971: break;
972:
973: case IPOPT_RR:
1.114 itojun 974: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
975: code = &cp[IPOPT_OLEN] - (u_char *)ip;
976: goto bad;
977: }
1.1 cgd 978: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
979: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
980: goto bad;
981: }
982: /*
983: * If no space remains, ignore.
984: */
985: off--; /* 0 origin */
1.112 sommerfe 986: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 987: break;
1.281 tsutsui 988: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 989: sizeof(ipaddr.sin_addr));
990: /*
991: * locate outgoing interface; if we're the destination,
992: * use the incoming interface (should be same).
993: */
1.96 thorpej 994: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
995: == NULL &&
996: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 997: type = ICMP_UNREACH;
998: code = ICMP_UNREACH_HOST;
999: goto bad;
1000: }
1.244 christos 1001: bcopy((void *)&ia->ia_addr.sin_addr,
1002: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1003: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1004: break;
1005:
1006: case IPOPT_TS:
1007: code = cp - (u_char *)ip;
1008: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1009: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1010: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1011: goto bad;
1.114 itojun 1012: }
1013: if (ipt->ipt_ptr < 5) {
1014: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1015: goto bad;
1016: }
1.15 cgd 1017: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1018: if (++ipt->ipt_oflw == 0) {
1019: code = (u_char *)&ipt->ipt_ptr -
1020: (u_char *)ip;
1.1 cgd 1021: goto bad;
1.114 itojun 1022: }
1.1 cgd 1023: break;
1024: }
1.104 thorpej 1025: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1026: switch (ipt->ipt_flg) {
1027:
1028: case IPOPT_TS_TSONLY:
1029: break;
1030:
1.329 ozaki-r 1031: case IPOPT_TS_TSANDADDR: {
1032: struct ifnet *rcvif;
1033: int s;
1034:
1.66 thorpej 1035: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1036: sizeof(struct in_addr) > ipt->ipt_len) {
1037: code = (u_char *)&ipt->ipt_ptr -
1038: (u_char *)ip;
1.1 cgd 1039: goto bad;
1.114 itojun 1040: }
1.13 mycroft 1041: ipaddr.sin_addr = dst;
1.329 ozaki-r 1042: rcvif = m_get_rcvif(m, &s);
1.96 thorpej 1043: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1.329 ozaki-r 1044: rcvif));
1045: m_put_rcvif(rcvif, &s);
1.13 mycroft 1046: if (ia == 0)
1047: continue;
1.104 thorpej 1048: bcopy(&ia->ia_addr.sin_addr,
1049: cp0, sizeof(struct in_addr));
1.1 cgd 1050: ipt->ipt_ptr += sizeof(struct in_addr);
1051: break;
1.329 ozaki-r 1052: }
1.1 cgd 1053:
1054: case IPOPT_TS_PRESPEC:
1.66 thorpej 1055: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1056: sizeof(struct in_addr) > ipt->ipt_len) {
1057: code = (u_char *)&ipt->ipt_ptr -
1058: (u_char *)ip;
1.1 cgd 1059: goto bad;
1.114 itojun 1060: }
1.281 tsutsui 1061: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1062: sizeof(struct in_addr));
1.96 thorpej 1063: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1064: == NULL)
1.1 cgd 1065: continue;
1066: ipt->ipt_ptr += sizeof(struct in_addr);
1067: break;
1068:
1069: default:
1.114 itojun 1070: /* XXX can't take &ipt->ipt_flg */
1071: code = (u_char *)&ipt->ipt_ptr -
1072: (u_char *)ip + 1;
1.1 cgd 1073: goto bad;
1074: }
1075: ntime = iptime();
1.107 thorpej 1076: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1077: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1078: sizeof(n_time));
1079: ipt->ipt_ptr += sizeof(n_time);
1080: }
1081: }
1082: if (forward) {
1.329 ozaki-r 1083: struct ifnet *rcvif;
1084: struct psref psref;
1085:
1.26 thorpej 1086: if (ip_forwsrcrt == 0) {
1087: type = ICMP_UNREACH;
1088: code = ICMP_UNREACH_SRCFAIL;
1089: goto bad;
1090: }
1.329 ozaki-r 1091:
1092: rcvif = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 1093: if (__predict_false(rcvif == NULL)) {
1094: type = ICMP_UNREACH;
1095: code = ICMP_UNREACH_HOST;
1096: goto bad;
1097: }
1.329 ozaki-r 1098: ip_forward(m, 1, rcvif);
1099: m_put_rcvif_psref(rcvif, &psref);
1.311 rmind 1100: return true;
1.13 mycroft 1101: }
1.311 rmind 1102: return false;
1.1 cgd 1103: bad:
1.13 mycroft 1104: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1105: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1106: return true;
1.1 cgd 1107: }
1108:
1109: /*
1.311 rmind 1110: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1111: * return internet address info of interface to be used to get there.
1112: */
1.311 rmind 1113: static struct in_ifaddr *
1.211 perry 1114: ip_rtaddr(struct in_addr dst)
1.1 cgd 1115: {
1.249 dyoung 1116: struct rtentry *rt;
1117: union {
1118: struct sockaddr dst;
1119: struct sockaddr_in dst4;
1120: } u;
1121:
1122: sockaddr_in_init(&u.dst4, &dst, 0);
1123:
1.318 rmind 1124: SOFTNET_LOCK();
1125: rt = rtcache_lookup(&ipforward_rt, &u.dst);
1126: SOFTNET_UNLOCK();
1127: if (rt == NULL)
1.249 dyoung 1128: return NULL;
1129:
1130: return ifatoia(rt->rt_ifa);
1.1 cgd 1131: }
1132:
1133: /*
1.311 rmind 1134: * save_rte: save incoming source route for use in replies, to be picked
1135: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1136: */
1.311 rmind 1137: static void
1.211 perry 1138: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1139: {
1140: unsigned olen;
1141:
1142: olen = option[IPOPT_OLEN];
1143: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1144: return;
1.281 tsutsui 1145: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1146: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1147: ip_srcrt.dst = dst;
1148: }
1149:
1150: /*
1151: * Retrieve incoming source route for use in replies,
1152: * in the same form used by setsockopt.
1153: * The first hop is placed before the options, will be removed later.
1154: */
1155: struct mbuf *
1.211 perry 1156: ip_srcroute(void)
1.1 cgd 1157: {
1.109 augustss 1158: struct in_addr *p, *q;
1159: struct mbuf *m;
1.1 cgd 1160:
1161: if (ip_nhops == 0)
1.237 dyoung 1162: return NULL;
1.1 cgd 1163: m = m_get(M_DONTWAIT, MT_SOOPTS);
1164: if (m == 0)
1.237 dyoung 1165: return NULL;
1.1 cgd 1166:
1.164 matt 1167: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1168: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1169:
1170: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1171: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1172: OPTSIZ;
1173:
1174: /*
1175: * First save first hop for return route
1176: */
1177: p = &ip_srcrt.route[ip_nhops - 1];
1178: *(mtod(m, struct in_addr *)) = *p--;
1179:
1180: /*
1181: * Copy option fields and padding (nop) to mbuf.
1182: */
1183: ip_srcrt.nop = IPOPT_NOP;
1184: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1185: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1186: OPTSIZ);
1187: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1188: sizeof(struct in_addr) + OPTSIZ);
1189: #undef OPTSIZ
1190: /*
1191: * Record return path as an IP source route,
1192: * reversing the path (pointers are now aligned).
1193: */
1194: while (p >= ip_srcrt.route) {
1195: *q++ = *p--;
1196: }
1197: /*
1198: * Last hop goes to final destination.
1199: */
1200: *q = ip_srcrt.dst;
1201: return (m);
1202: }
1203:
1.139 matt 1204: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1205: [PRC_MSGSIZE] = EMSGSIZE,
1206: [PRC_HOSTDEAD] = EHOSTDOWN,
1207: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1208: [PRC_UNREACH_NET] = EHOSTUNREACH,
1209: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1210: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1211: [PRC_UNREACH_PORT] = ECONNREFUSED,
1212: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1213: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1214: };
1215:
1.295 dyoung 1216: void
1217: ip_fasttimo(void)
1218: {
1219: if (ip_drainwanted) {
1220: ip_drain();
1221: ip_drainwanted = 0;
1222: }
1223: }
1224:
1225: void
1226: ip_drainstub(void)
1227: {
1228: ip_drainwanted = 1;
1229: }
1230:
1.1 cgd 1231: /*
1232: * Forward a packet. If some error occurs return the sender
1233: * an icmp packet. Note we can't always generate a meaningful
1234: * icmp message because icmp doesn't have a large enough repertoire
1235: * of codes and types.
1236: *
1237: * If not forwarding, just drop the packet. This could be confusing
1238: * if ipforwarding was zero but some routing protocol was advancing
1239: * us as a gateway to somewhere. However, we must let the routing
1240: * protocol deal with that.
1241: *
1242: * The srcrt parameter indicates whether the packet is being forwarded
1243: * via a source route.
1244: */
1.313 rmind 1245: static void
1.329 ozaki-r 1246: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1 cgd 1247: {
1.109 augustss 1248: struct ip *ip = mtod(m, struct ip *);
1249: struct rtentry *rt;
1.220 christos 1250: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1251: struct mbuf *mcopy;
1.13 mycroft 1252: n_long dest;
1.249 dyoung 1253: union {
1254: struct sockaddr dst;
1255: struct sockaddr_in dst4;
1256: } u;
1.320 ozaki-r 1257: uint64_t *ips;
1.164 matt 1258:
1.318 rmind 1259: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1260: "interrupt handler; synchronization assumptions violated");
1261:
1.164 matt 1262: /*
1263: * We are now in the output path.
1264: */
1265: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1266:
1267: /*
1268: * Clear any in-bound checksum flags for this packet.
1269: */
1270: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1271:
1.13 mycroft 1272: dest = 0;
1.93 sommerfe 1273: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1274: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1275: m_freem(m);
1276: return;
1277: }
1.318 rmind 1278:
1279: SOFTNET_LOCK();
1280:
1.1 cgd 1281: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1282: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318 rmind 1283: SOFTNET_UNLOCK();
1.1 cgd 1284: return;
1285: }
1286:
1.249 dyoung 1287: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1288:
1.249 dyoung 1289: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1290: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318 rmind 1291: SOFTNET_UNLOCK();
1.249 dyoung 1292: return;
1.1 cgd 1293: }
1294:
1295: /*
1.34 mycroft 1296: * Save at most 68 bytes of the packet in case
1.1 cgd 1297: * we need to generate an ICMP message to the src.
1.119 itojun 1298: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1299: */
1.155 itojun 1300: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1301: if (mcopy)
1302: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1303:
1.221 christos 1304: ip->ip_ttl -= IPTTLDEC;
1305:
1.1 cgd 1306: /*
1307: * If forwarding packet using same interface that it came in on,
1308: * perhaps should send a redirect to sender to shortcut a hop.
1309: * Only send redirect if source is sending directly to us,
1310: * and if packet was not source routed (or has any options).
1311: * Also, don't send redirect if forwarding using a default route
1312: * or a route modified by a redirect.
1313: */
1.329 ozaki-r 1314: if (rt->rt_ifp == rcvif &&
1.1 cgd 1315: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1316: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1317: ipsendredirects && !srcrt) {
1.19 mycroft 1318: if (rt->rt_ifa &&
1319: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1320: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1321: if (rt->rt_flags & RTF_GATEWAY)
1322: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1323: else
1324: dest = ip->ip_dst.s_addr;
1325: /*
1326: * Router requirements says to only send host
1327: * redirects.
1328: */
1329: type = ICMP_REDIRECT;
1330: code = ICMP_REDIRECT_HOST;
1.1 cgd 1331: }
1332: }
1333:
1.238 dyoung 1334: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1335: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1336: NULL, NULL);
1.173 jonathan 1337:
1.320 ozaki-r 1338: if (error) {
1.266 thorpej 1339: IP_STATINC(IP_STAT_CANTFORWARD);
1.320 ozaki-r 1340: goto error;
1341: }
1342:
1343: ips = IP_STAT_GETREF();
1344: ips[IP_STAT_FORWARD]++;
1345:
1346: if (type) {
1347: ips[IP_STAT_REDIRECTSENT]++;
1348: IP_STAT_PUTREF();
1349: goto redirect;
1350: }
1351:
1352: IP_STAT_PUTREF();
1353: if (mcopy) {
1.63 matt 1354: #ifdef GATEWAY
1.320 ozaki-r 1355: if (mcopy->m_flags & M_CANFASTFWD)
1356: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1357: #endif
1.320 ozaki-r 1358: m_freem(mcopy);
1.1 cgd 1359: }
1.320 ozaki-r 1360:
1361: SOFTNET_UNLOCK();
1362: return;
1363:
1364: redirect:
1365: error:
1.318 rmind 1366: if (mcopy == NULL) {
1367: SOFTNET_UNLOCK();
1.1 cgd 1368: return;
1.318 rmind 1369: }
1.13 mycroft 1370:
1.1 cgd 1371: switch (error) {
1372:
1373: case 0: /* forwarded, but need redirect */
1374: /* type, code set above */
1375: break;
1376:
1377: case ENETUNREACH: /* shouldn't happen, checked above */
1378: case EHOSTUNREACH:
1379: case ENETDOWN:
1380: case EHOSTDOWN:
1381: default:
1382: type = ICMP_UNREACH;
1383: code = ICMP_UNREACH_HOST;
1384: break;
1385:
1386: case EMSGSIZE:
1387: type = ICMP_UNREACH;
1388: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1389:
1.274 seanb 1390: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1391: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1392: #ifdef IPSEC
1.317 christos 1393: if (ipsec_used)
1394: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1395: #endif
1.266 thorpej 1396: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1397: break;
1398:
1399: case ENOBUFS:
1.143 itojun 1400: /*
1.311 rmind 1401: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
1402: * Requirements for IP Version 4 Routers. Source quench can
1403: * big problem under DoS attacks or if the underlying
1404: * interface is rate-limited.
1.143 itojun 1405: */
1406: if (mcopy)
1407: m_freem(mcopy);
1.318 rmind 1408: SOFTNET_UNLOCK();
1.143 itojun 1409: return;
1.1 cgd 1410: }
1.220 christos 1411: icmp_error(mcopy, type, code, dest, destmtu);
1.318 rmind 1412: SOFTNET_UNLOCK();
1.44 thorpej 1413: }
1414:
1415: void
1.211 perry 1416: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1417: struct mbuf *m)
1.44 thorpej 1418: {
1.311 rmind 1419: struct socket *so = inp->inp_socket;
1.329 ozaki-r 1420: ifnet_t *ifp;
1.311 rmind 1421: int inpflags = inp->inp_flags;
1.329 ozaki-r 1422: struct psref psref;
1.44 thorpej 1423:
1.329 ozaki-r 1424: ifp = m_get_rcvif_psref(m, &psref);
1.330 ozaki-r 1425: if (__predict_false(ifp == NULL))
1426: return; /* XXX should report error? */
1427:
1.311 rmind 1428: if (so->so_options & SO_TIMESTAMP
1.278 christos 1429: #ifdef SO_OTIMESTAMP
1.311 rmind 1430: || so->so_options & SO_OTIMESTAMP
1.278 christos 1431: #endif
1432: ) {
1.44 thorpej 1433: struct timeval tv;
1434:
1435: microtime(&tv);
1.278 christos 1436: #ifdef SO_OTIMESTAMP
1.311 rmind 1437: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1438: struct timeval50 tv50;
1439: timeval_to_timeval50(&tv, &tv50);
1440: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1441: SCM_OTIMESTAMP, SOL_SOCKET);
1442: } else
1443: #endif
1.244 christos 1444: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1445: SCM_TIMESTAMP, SOL_SOCKET);
1446: if (*mp)
1447: mp = &(*mp)->m_next;
1448: }
1.311 rmind 1449: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1450: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1451: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1452: if (*mp)
1453: mp = &(*mp)->m_next;
1454: }
1.311 rmind 1455: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1456: struct in_pktinfo ipi;
1.307 christos 1457: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1458: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1459: *mp = sbcreatecontrol((void *) &ipi,
1460: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1461: if (*mp)
1462: mp = &(*mp)->m_next;
1463: }
1.311 rmind 1464: if (inpflags & INP_PKTINFO) {
1.306 christos 1465: struct in_pktinfo ipi;
1.307 christos 1466: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1467: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1468: *mp = sbcreatecontrol((void *) &ipi,
1469: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1470: if (*mp)
1471: mp = &(*mp)->m_next;
1472: }
1.311 rmind 1473: if (inpflags & INP_RECVIF) {
1.44 thorpej 1474: struct sockaddr_dl sdl;
1475:
1.314 rmind 1476: sockaddr_dl_init(&sdl, sizeof(sdl), ifp ?
1477: ifp->if_index : 0, 0, NULL, 0, NULL, 0);
1.251 dyoung 1478: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1479: if (*mp)
1480: mp = &(*mp)->m_next;
1481: }
1.311 rmind 1482: if (inpflags & INP_RECVTTL) {
1.282 minskim 1483: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1484: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1485: if (*mp)
1486: mp = &(*mp)->m_next;
1487: }
1.329 ozaki-r 1488: m_put_rcvif_psref(ifp, &psref);
1.13 mycroft 1489: }
1490:
1.189 atatat 1491: /*
1.228 elad 1492: * sysctl helper routine for net.inet.ip.forwsrcrt.
1493: */
1494: static int
1495: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1496: {
1497: int error, tmp;
1498: struct sysctlnode node;
1499:
1500: node = *rnode;
1501: tmp = ip_forwsrcrt;
1502: node.sysctl_data = &tmp;
1503: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1504: if (error || newp == NULL)
1505: return (error);
1506:
1.280 elad 1507: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1508: 0, NULL, NULL, NULL);
1509: if (error)
1510: return (error);
1.228 elad 1511:
1512: ip_forwsrcrt = tmp;
1513:
1514: return (0);
1515: }
1516:
1517: /*
1.189 atatat 1518: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1519: * range of the new value and tweaks timers if it changes.
1520: */
1521: static int
1522: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1523: {
1.189 atatat 1524: int error, tmp;
1525: struct sysctlnode node;
1526:
1527: node = *rnode;
1528: tmp = ip_mtudisc_timeout;
1529: node.sysctl_data = &tmp;
1530: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1531: if (error || newp == NULL)
1532: return (error);
1533: if (tmp < 0)
1534: return (EINVAL);
1.52 thorpej 1535:
1.273 matt 1536: mutex_enter(softnet_lock);
1537:
1.189 atatat 1538: ip_mtudisc_timeout = tmp;
1539: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1540:
1.273 matt 1541: mutex_exit(softnet_lock);
1542:
1.189 atatat 1543: return (0);
1544: }
1.54 lukem 1545:
1.266 thorpej 1546: static int
1547: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1548: {
1549:
1.271 thorpej 1550: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1551: }
1.131 itojun 1552:
1.284 pooka 1553: static void
1554: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1555: {
1.197 atatat 1556: sysctl_createv(clog, 0, NULL, NULL,
1557: CTLFLAG_PERMANENT,
1.203 atatat 1558: CTLTYPE_NODE, "inet",
1559: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1560: NULL, 0, NULL, 0,
1561: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1562: sysctl_createv(clog, 0, NULL, NULL,
1563: CTLFLAG_PERMANENT,
1.203 atatat 1564: CTLTYPE_NODE, "ip",
1565: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1566: NULL, 0, NULL, 0,
1567: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1568:
1.197 atatat 1569: sysctl_createv(clog, 0, NULL, NULL,
1570: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1571: CTLTYPE_INT, "forwarding",
1572: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1573: NULL, 0, &ipforwarding, 0,
1574: CTL_NET, PF_INET, IPPROTO_IP,
1575: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1576: sysctl_createv(clog, 0, NULL, NULL,
1577: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1578: CTLTYPE_INT, "redirect",
1579: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1580: NULL, 0, &ipsendredirects, 0,
1581: CTL_NET, PF_INET, IPPROTO_IP,
1582: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1583: sysctl_createv(clog, 0, NULL, NULL,
1584: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1585: CTLTYPE_INT, "ttl",
1586: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1587: NULL, 0, &ip_defttl, 0,
1588: CTL_NET, PF_INET, IPPROTO_IP,
1589: IPCTL_DEFTTL, CTL_EOL);
1590: #ifdef IPCTL_DEFMTU
1.197 atatat 1591: sysctl_createv(clog, 0, NULL, NULL,
1592: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1593: CTLTYPE_INT, "mtu",
1594: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1595: NULL, 0, &ip_mtu, 0,
1596: CTL_NET, PF_INET, IPPROTO_IP,
1597: IPCTL_DEFMTU, CTL_EOL);
1598: #endif /* IPCTL_DEFMTU */
1.197 atatat 1599: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1600: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1601: CTLTYPE_INT, "forwsrcrt",
1602: SYSCTL_DESCR("Enable forwarding of source-routed "
1603: "datagrams"),
1.228 elad 1604: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1605: CTL_NET, PF_INET, IPPROTO_IP,
1606: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1607: sysctl_createv(clog, 0, NULL, NULL,
1608: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1609: CTLTYPE_INT, "directed-broadcast",
1610: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1611: NULL, 0, &ip_directedbcast, 0,
1612: CTL_NET, PF_INET, IPPROTO_IP,
1613: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1614: sysctl_createv(clog, 0, NULL, NULL,
1615: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1616: CTLTYPE_INT, "allowsrcrt",
1617: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1618: NULL, 0, &ip_allowsrcrt, 0,
1619: CTL_NET, PF_INET, IPPROTO_IP,
1620: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1621:
1.197 atatat 1622: sysctl_createv(clog, 0, NULL, NULL,
1623: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1624: CTLTYPE_INT, "mtudisc",
1625: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1626: NULL, 0, &ip_mtudisc, 0,
1627: CTL_NET, PF_INET, IPPROTO_IP,
1628: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1629: sysctl_createv(clog, 0, NULL, NULL,
1630: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1631: CTLTYPE_INT, "anonportmin",
1632: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1633: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1634: CTL_NET, PF_INET, IPPROTO_IP,
1635: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1636: sysctl_createv(clog, 0, NULL, NULL,
1637: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1638: CTLTYPE_INT, "anonportmax",
1639: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1640: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1641: CTL_NET, PF_INET, IPPROTO_IP,
1642: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1643: sysctl_createv(clog, 0, NULL, NULL,
1644: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1645: CTLTYPE_INT, "mtudisctimeout",
1646: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1647: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1648: CTL_NET, PF_INET, IPPROTO_IP,
1649: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1650: #ifndef IPNOPRIVPORTS
1.197 atatat 1651: sysctl_createv(clog, 0, NULL, NULL,
1652: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1653: CTLTYPE_INT, "lowportmin",
1654: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1655: "to assign"),
1.189 atatat 1656: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1657: CTL_NET, PF_INET, IPPROTO_IP,
1658: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1659: sysctl_createv(clog, 0, NULL, NULL,
1660: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1661: CTLTYPE_INT, "lowportmax",
1662: SYSCTL_DESCR("Highest privileged ephemeral port number "
1663: "to assign"),
1.189 atatat 1664: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1665: CTL_NET, PF_INET, IPPROTO_IP,
1666: IPCTL_LOWPORTMAX, CTL_EOL);
1667: #endif /* IPNOPRIVPORTS */
1668: #if NGRE > 0
1.197 atatat 1669: sysctl_createv(clog, 0, NULL, NULL,
1670: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1671: CTLTYPE_INT, "grettl",
1672: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1673: NULL, 0, &ip_gre_ttl, 0,
1674: CTL_NET, PF_INET, IPPROTO_IP,
1675: IPCTL_GRE_TTL, CTL_EOL);
1676: #endif /* NGRE */
1.197 atatat 1677: sysctl_createv(clog, 0, NULL, NULL,
1678: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1679: CTLTYPE_INT, "checkinterface",
1680: SYSCTL_DESCR("Enable receive side of Strong ES model "
1681: "from RFC1122"),
1.189 atatat 1682: NULL, 0, &ip_checkinterface, 0,
1683: CTL_NET, PF_INET, IPPROTO_IP,
1684: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1685: sysctl_createv(clog, 0, NULL, NULL,
1686: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1687: CTLTYPE_INT, "random_id",
1688: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1689: NULL, 0, &ip_do_randomid, 0,
1690: CTL_NET, PF_INET, IPPROTO_IP,
1691: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1692: sysctl_createv(clog, 0, NULL, NULL,
1693: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1694: CTLTYPE_INT, "do_loopback_cksum",
1695: SYSCTL_DESCR("Perform IP checksum on loopback"),
1696: NULL, 0, &ip_do_loopback_cksum, 0,
1697: CTL_NET, PF_INET, IPPROTO_IP,
1698: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1699: sysctl_createv(clog, 0, NULL, NULL,
1700: CTLFLAG_PERMANENT,
1701: CTLTYPE_STRUCT, "stats",
1702: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1703: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1704: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1705: CTL_EOL);
1.322 joerg 1706: #if NARP
1.321 roy 1707: sysctl_createv(clog, 0, NULL, NULL,
1708: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1709: CTLTYPE_INT, "dad_count",
1710: SYSCTL_DESCR("Number of Duplicate Address Detection "
1711: "probes to send"),
1712: NULL, 0, &ip_dad_count, 0,
1713: CTL_NET, PF_INET, IPPROTO_IP,
1714: IPCTL_DAD_COUNT, CTL_EOL);
1.322 joerg 1715: #endif
1.301 christos 1716:
1717: /* anonportalgo RFC6056 subtree */
1.302 christos 1718: const struct sysctlnode *portalgo_node;
1719: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1720: CTLFLAG_PERMANENT,
1721: CTLTYPE_NODE, "anonportalgo",
1722: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1723: NULL, 0, NULL, 0,
1724: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1725: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1726: CTLFLAG_PERMANENT,
1727: CTLTYPE_STRING, "available",
1728: SYSCTL_DESCR("available algorithms"),
1.302 christos 1729: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1730: CTL_CREATE, CTL_EOL);
1.302 christos 1731: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1732: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1733: CTLTYPE_STRING, "selected",
1734: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1735: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1736: CTL_CREATE, CTL_EOL);
1737: sysctl_createv(clog, 0, &portalgo_node, NULL,
1738: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1739: CTLTYPE_STRUCT, "reserve",
1740: SYSCTL_DESCR("bitmap of reserved ports"),
1741: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1742: CTL_CREATE, CTL_EOL);
1.1 cgd 1743: }
1.266 thorpej 1744:
1745: void
1746: ip_statinc(u_int stat)
1747: {
1748:
1749: KASSERT(stat < IP_NSTATS);
1750: IP_STATINC(stat);
1751: }
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