Annotation of src/sys/netinet/ip_input.c, Revision 1.114.4.6
1.114.4.6! he 1: /* $NetBSD: ip_input.c,v 1.114.4.5 2001/04/06 00:24:47 he Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
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: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.55 scottr 103:
1.62 matt 104: #include "opt_gateway.h"
1.69 mrg 105: #include "opt_pfil_hooks.h"
1.91 thorpej 106: #include "opt_ipsec.h"
1.55 scottr 107: #include "opt_mrouting.h"
1.1 cgd 108:
1.5 mycroft 109: #include <sys/param.h>
110: #include <sys/systm.h>
111: #include <sys/malloc.h>
112: #include <sys/mbuf.h>
113: #include <sys/domain.h>
114: #include <sys/protosw.h>
115: #include <sys/socket.h>
1.44 thorpej 116: #include <sys/socketvar.h>
1.5 mycroft 117: #include <sys/errno.h>
118: #include <sys/time.h>
119: #include <sys/kernel.h>
1.28 christos 120: #include <sys/proc.h>
1.72 thorpej 121: #include <sys/pool.h>
1.28 christos 122:
123: #include <vm/vm.h>
124: #include <sys/sysctl.h>
1.1 cgd 125:
1.5 mycroft 126: #include <net/if.h>
1.44 thorpej 127: #include <net/if_dl.h>
1.5 mycroft 128: #include <net/route.h>
1.45 mrg 129: #include <net/pfil.h>
1.1 cgd 130:
1.5 mycroft 131: #include <netinet/in.h>
132: #include <netinet/in_systm.h>
133: #include <netinet/ip.h>
134: #include <netinet/in_pcb.h>
135: #include <netinet/in_var.h>
136: #include <netinet/ip_var.h>
137: #include <netinet/ip_icmp.h>
1.89 itojun 138: /* just for gif_ttl */
139: #include <netinet/in_gif.h>
140: #include "gif.h"
1.111 jdolecek 141:
142: #ifdef MROUTING
143: #include <netinet/ip_mroute.h>
144: #endif
1.89 itojun 145:
146: #ifdef IPSEC
147: #include <netinet6/ipsec.h>
148: #include <netkey/key.h>
149: #include <netkey/key_debug.h>
150: #endif
1.44 thorpej 151:
1.1 cgd 152: #ifndef IPFORWARDING
153: #ifdef GATEWAY
154: #define IPFORWARDING 1 /* forward IP packets not for us */
155: #else /* GATEWAY */
156: #define IPFORWARDING 0 /* don't forward IP packets not for us */
157: #endif /* GATEWAY */
158: #endif /* IPFORWARDING */
159: #ifndef IPSENDREDIRECTS
160: #define IPSENDREDIRECTS 1
161: #endif
1.26 thorpej 162: #ifndef IPFORWSRCRT
1.47 cjs 163: #define IPFORWSRCRT 1 /* forward source-routed packets */
164: #endif
165: #ifndef IPALLOWSRCRT
1.48 mrg 166: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 167: #endif
1.53 kml 168: #ifndef IPMTUDISC
169: #define IPMTUDISC 0
170: #endif
1.60 kml 171: #ifndef IPMTUDISCTIMEOUT
1.61 kml 172: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 173: #endif
1.53 kml 174:
1.27 thorpej 175: /*
176: * Note: DIRECTED_BROADCAST is handled this way so that previous
177: * configuration using this option will Just Work.
178: */
179: #ifndef IPDIRECTEDBCAST
180: #ifdef DIRECTED_BROADCAST
181: #define IPDIRECTEDBCAST 1
182: #else
183: #define IPDIRECTEDBCAST 0
184: #endif /* DIRECTED_BROADCAST */
185: #endif /* IPDIRECTEDBCAST */
1.1 cgd 186: int ipforwarding = IPFORWARDING;
187: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 188: int ip_defttl = IPDEFTTL;
1.26 thorpej 189: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 190: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 191: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 192: int ip_mtudisc = IPMTUDISC;
1.60 kml 193: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
197:
1.60 kml 198: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
199:
1.1 cgd 200: extern struct domain inetdomain;
201: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 202: struct in_ifaddrhead in_ifaddr;
1.57 tls 203: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 204: struct ifqueue ipintrq;
1.63 matt 205: struct ipstat ipstat;
206: u_int16_t ip_id;
1.75 thorpej 207:
1.63 matt 208: struct ipqhead ipq;
1.75 thorpej 209: int ipq_locked;
1.114.4.6! he 210: int ip_nfragpackets = 0;
! 211: int ip_maxfragpackets = 200;
1.75 thorpej 212:
213: static __inline int ipq_lock_try __P((void));
214: static __inline void ipq_unlock __P((void));
215:
216: static __inline int
217: ipq_lock_try()
218: {
219: int s;
220:
221: s = splimp();
222: if (ipq_locked) {
223: splx(s);
224: return (0);
225: }
226: ipq_locked = 1;
227: splx(s);
228: return (1);
229: }
230:
231: static __inline void
232: ipq_unlock()
233: {
234: int s;
235:
236: s = splimp();
237: ipq_locked = 0;
238: splx(s);
239: }
240:
241: #ifdef DIAGNOSTIC
242: #define IPQ_LOCK() \
243: do { \
244: if (ipq_lock_try() == 0) { \
245: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
246: panic("ipq_lock"); \
247: } \
248: } while (0)
249: #define IPQ_LOCK_CHECK() \
250: do { \
251: if (ipq_locked == 0) { \
252: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
253: panic("ipq lock check"); \
254: } \
255: } while (0)
256: #else
257: #define IPQ_LOCK() (void) ipq_lock_try()
258: #define IPQ_LOCK_CHECK() /* nothing */
259: #endif
260:
261: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 262:
1.72 thorpej 263: struct pool ipqent_pool;
264:
1.1 cgd 265: /*
266: * We need to save the IP options in case a protocol wants to respond
267: * to an incoming packet over the same route if the packet got here
268: * using IP source routing. This allows connection establishment and
269: * maintenance when the remote end is on a network that is not known
270: * to us.
271: */
272: int ip_nhops = 0;
273: static struct ip_srcrt {
274: struct in_addr dst; /* final destination */
275: char nop; /* one NOP to align */
276: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
277: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
278: } ip_srcrt;
279:
1.13 mycroft 280: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 281:
1.1 cgd 282: /*
283: * IP initialization: fill in IP protocol switch table.
284: * All protocols not implemented in kernel go to raw IP protocol handler.
285: */
1.8 mycroft 286: void
1.1 cgd 287: ip_init()
288: {
1.109 augustss 289: struct protosw *pr;
290: int i;
1.1 cgd 291:
1.72 thorpej 292: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
293: 0, NULL, NULL, M_IPQ);
294:
1.1 cgd 295: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
296: if (pr == 0)
297: panic("ip_init");
298: for (i = 0; i < IPPROTO_MAX; i++)
299: ip_protox[i] = pr - inetsw;
300: for (pr = inetdomain.dom_protosw;
301: pr < inetdomain.dom_protoswNPROTOSW; pr++)
302: if (pr->pr_domain->dom_family == PF_INET &&
303: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
304: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 305: LIST_INIT(&ipq);
1.1 cgd 306: ip_id = time.tv_sec & 0xffff;
307: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 308: TAILQ_INIT(&in_ifaddr);
1.57 tls 309: in_ifaddrhashtbl =
310: hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60 kml 311: if (ip_mtudisc != 0)
312: ip_mtudisc_timeout_q =
313: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 314: #ifdef GATEWAY
315: ipflow_init();
316: #endif
1.1 cgd 317: }
318:
319: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
320: struct route ipforward_rt;
321:
322: /*
1.89 itojun 323: * IP software interrupt routine
324: */
325: void
326: ipintr()
327: {
328: int s;
329: struct mbuf *m;
330:
331: while (1) {
332: s = splimp();
333: IF_DEQUEUE(&ipintrq, m);
334: splx(s);
335: if (m == 0)
336: return;
337: ip_input(m);
338: }
339: }
340:
341: /*
1.1 cgd 342: * Ip input routine. Checksum and byte swap header. If fragmented
343: * try to reassemble. Process options. Pass to next level.
344: */
1.8 mycroft 345: void
1.89 itojun 346: ip_input(struct mbuf *m)
1.1 cgd 347: {
1.109 augustss 348: struct ip *ip = NULL;
349: struct ipq *fp;
350: struct in_ifaddr *ia;
351: struct ifaddr *ifa;
1.25 cgd 352: struct ipqent *ipqe;
1.89 itojun 353: int hlen = 0, mff, len;
1.100 itojun 354: int downmatch;
1.36 mrg 355: #ifdef PFIL_HOOKS
1.33 mrg 356: struct packet_filter_hook *pfh;
357: struct mbuf *m0;
1.43 mrg 358: int rv;
1.36 mrg 359: #endif /* PFIL_HOOKS */
1.1 cgd 360:
361: #ifdef DIAGNOSTIC
362: if ((m->m_flags & M_PKTHDR) == 0)
363: panic("ipintr no HDR");
364: #endif
1.89 itojun 365: #ifdef IPSEC
366: /*
367: * should the inner packet be considered authentic?
368: * see comment in ah4_input().
369: */
370: if (m) {
371: m->m_flags &= ~M_AUTHIPHDR;
372: m->m_flags &= ~M_AUTHIPDGM;
373: }
374: #endif
1.1 cgd 375: /*
376: * If no IP addresses have been set yet but the interfaces
377: * are receiving, can't do anything with incoming packets yet.
378: */
1.22 mycroft 379: if (in_ifaddr.tqh_first == 0)
1.1 cgd 380: goto bad;
381: ipstat.ips_total++;
382: if (m->m_len < sizeof (struct ip) &&
383: (m = m_pullup(m, sizeof (struct ip))) == 0) {
384: ipstat.ips_toosmall++;
1.89 itojun 385: return;
1.1 cgd 386: }
387: ip = mtod(m, struct ip *);
1.13 mycroft 388: if (ip->ip_v != IPVERSION) {
389: ipstat.ips_badvers++;
390: goto bad;
391: }
1.1 cgd 392: hlen = ip->ip_hl << 2;
393: if (hlen < sizeof(struct ip)) { /* minimum header length */
394: ipstat.ips_badhlen++;
395: goto bad;
396: }
397: if (hlen > m->m_len) {
398: if ((m = m_pullup(m, hlen)) == 0) {
399: ipstat.ips_badhlen++;
1.89 itojun 400: return;
1.1 cgd 401: }
402: ip = mtod(m, struct ip *);
403: }
1.98 thorpej 404:
1.85 hwr 405: /*
1.99 thorpej 406: * RFC1122: packets with a multicast source address are
1.98 thorpej 407: * not allowed.
1.85 hwr 408: */
409: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 410: /* XXX stat */
1.85 hwr 411: goto bad;
412: }
413:
1.78 mycroft 414: if (in_cksum(m, hlen) != 0) {
1.1 cgd 415: ipstat.ips_badsum++;
416: goto bad;
417: }
418:
419: /*
420: * Convert fields to host representation.
421: */
422: NTOHS(ip->ip_len);
423: NTOHS(ip->ip_off);
1.35 mycroft 424: len = ip->ip_len;
1.81 proff 425:
426: /*
427: * Check for additional length bogosity
428: */
1.84 proff 429: if (len < hlen) {
1.81 proff 430: ipstat.ips_badlen++;
431: goto bad;
432: }
1.1 cgd 433:
434: /*
435: * Check that the amount of data in the buffers
436: * is as at least much as the IP header would have us expect.
437: * Trim mbufs if longer than we expect.
438: * Drop packet if shorter than we expect.
439: */
1.35 mycroft 440: if (m->m_pkthdr.len < len) {
1.1 cgd 441: ipstat.ips_tooshort++;
442: goto bad;
443: }
1.35 mycroft 444: if (m->m_pkthdr.len > len) {
1.1 cgd 445: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 446: m->m_len = len;
447: m->m_pkthdr.len = len;
1.1 cgd 448: } else
1.35 mycroft 449: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 450: }
451:
1.94 itojun 452: #ifdef IPSEC
453: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
454: m->m_flags &= ~M_CANFASTFWD;
455: #else
1.64 thorpej 456: /*
457: * Assume that we can create a fast-forward IP flow entry
458: * based on this packet.
459: */
460: m->m_flags |= M_CANFASTFWD;
1.94 itojun 461: #endif
1.64 thorpej 462:
1.36 mrg 463: #ifdef PFIL_HOOKS
1.114.4.5 he 464: #ifdef IPSEC
465: /*
466: * let ipfilter look at packet on the wire,
467: * not the decapsulated packet.
468: */
469: if (ipsec_gethist(m, NULL))
470: goto nofilt;
471: #endif
1.33 mrg 472: /*
1.64 thorpej 473: * Run through list of hooks for input packets. If there are any
474: * filters which require that additional packets in the flow are
475: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
476: * Note that filters must _never_ set this flag, as another filter
477: * in the list may have previously cleared it.
1.33 mrg 478: */
479: m0 = m;
1.102 darrenr 480: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 481: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 482: if (pfh->pfil_func) {
1.101 darrenr 483: rv = pfh->pfil_func(ip, hlen,
484: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 485: if (rv)
1.89 itojun 486: return;
1.68 sommerfe 487: m = m0;
488: if (m == NULL)
1.89 itojun 489: return;
1.68 sommerfe 490: ip = mtod(m, struct ip *);
1.33 mrg 491: }
1.114.4.5 he 492: #ifdef IPSEC
493: nofilt:;
494: #endif
1.36 mrg 495: #endif /* PFIL_HOOKS */
1.33 mrg 496:
1.1 cgd 497: /*
498: * Process options and, if not destined for us,
499: * ship it on. ip_dooptions returns 1 when an
500: * error was detected (causing an icmp message
501: * to be sent and the original packet to be freed).
502: */
503: ip_nhops = 0; /* for source routed packets */
504: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 505: return;
1.1 cgd 506:
507: /*
508: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 509: *
510: * Traditional 4.4BSD did not consult IFF_UP at all.
511: * The behavior here is to treat addresses on !IFF_UP interface
512: * as not mine.
1.1 cgd 513: */
1.100 itojun 514: downmatch = 0;
1.97 itojun 515: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
516: ia != NULL;
517: ia = ia->ia_hash.le_next) {
518: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
519: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
520: break;
1.100 itojun 521: else
522: downmatch++;
1.97 itojun 523: }
524: }
1.86 thorpej 525: if (ia != NULL)
526: goto ours;
1.57 tls 527: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
528: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
529: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
530: if (ifa->ifa_addr->sa_family != AF_INET) continue;
531: ia = ifatoia(ifa);
1.35 mycroft 532: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
533: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 534: /*
535: * Look for all-0's host part (old broadcast addr),
536: * either for subnet or net.
537: */
538: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 539: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 540: goto ours;
1.57 tls 541: /*
542: * An interface with IP address zero accepts
543: * all packets that arrive on that interface.
544: */
545: if (in_nullhost(ia->ia_addr.sin_addr))
546: goto ours;
1.1 cgd 547: }
548: }
1.18 mycroft 549: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 550: struct in_multi *inm;
551: #ifdef MROUTING
552: extern struct socket *ip_mrouter;
1.10 brezak 553:
554: if (m->m_flags & M_EXT) {
555: if ((m = m_pullup(m, hlen)) == 0) {
556: ipstat.ips_toosmall++;
1.89 itojun 557: return;
1.10 brezak 558: }
559: ip = mtod(m, struct ip *);
560: }
1.4 hpeyerl 561:
562: if (ip_mrouter) {
563: /*
564: * If we are acting as a multicast router, all
565: * incoming multicast packets are passed to the
566: * kernel-level multicast forwarding function.
567: * The packet is returned (relatively) intact; if
568: * ip_mforward() returns a non-zero value, the packet
569: * must be discarded, else it may be accepted below.
570: *
571: * (The IP ident field is put in the same byte order
572: * as expected when ip_mforward() is called from
573: * ip_output().)
574: */
1.13 mycroft 575: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
576: ipstat.ips_cantforward++;
1.4 hpeyerl 577: m_freem(m);
1.89 itojun 578: return;
1.4 hpeyerl 579: }
580:
581: /*
582: * The process-level routing demon needs to receive
583: * all multicast IGMP packets, whether or not this
584: * host belongs to their destination groups.
585: */
586: if (ip->ip_p == IPPROTO_IGMP)
587: goto ours;
1.13 mycroft 588: ipstat.ips_forward++;
1.4 hpeyerl 589: }
590: #endif
591: /*
592: * See if we belong to the destination multicast group on the
593: * arrival interface.
594: */
595: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
596: if (inm == NULL) {
1.13 mycroft 597: ipstat.ips_cantforward++;
1.4 hpeyerl 598: m_freem(m);
1.89 itojun 599: return;
1.4 hpeyerl 600: }
601: goto ours;
602: }
1.19 mycroft 603: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 604: in_nullhost(ip->ip_dst))
1.1 cgd 605: goto ours;
606:
607: /*
608: * Not for us; forward if possible and desirable.
609: */
610: if (ipforwarding == 0) {
611: ipstat.ips_cantforward++;
612: m_freem(m);
1.100 itojun 613: } else {
614: /*
615: * If ip_dst matched any of my address on !IFF_UP interface,
616: * and there's no IFF_UP interface that matches ip_dst,
617: * send icmp unreach. Forwarding it will result in in-kernel
618: * forwarding loop till TTL goes to 0.
619: */
620: if (downmatch) {
621: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
622: ipstat.ips_cantforward++;
623: return;
624: }
1.1 cgd 625: ip_forward(m, 0);
1.100 itojun 626: }
1.89 itojun 627: return;
1.1 cgd 628:
629: ours:
630: /*
631: * If offset or IP_MF are set, must reassemble.
632: * Otherwise, nothing need be done.
633: * (We could look in the reassembly queue to see
634: * if the packet was previously fragmented,
635: * but it's not worth the time; just let them time out.)
636: */
1.37 perry 637: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 638: /*
639: * Look for queue of fragments
640: * of this datagram.
641: */
1.75 thorpej 642: IPQ_LOCK();
1.25 cgd 643: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 644: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 645: in_hosteq(ip->ip_src, fp->ipq_src) &&
646: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 647: ip->ip_p == fp->ipq_p)
648: goto found;
649: fp = 0;
650: found:
651:
652: /*
653: * Adjust ip_len to not reflect header,
1.25 cgd 654: * set ipqe_mff if more fragments are expected,
1.1 cgd 655: * convert offset of this to bytes.
656: */
657: ip->ip_len -= hlen;
1.25 cgd 658: mff = (ip->ip_off & IP_MF) != 0;
659: if (mff) {
1.16 cgd 660: /*
661: * Make sure that fragments have a data length
662: * that's a non-zero multiple of 8 bytes.
663: */
1.17 cgd 664: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 665: ipstat.ips_badfrags++;
1.75 thorpej 666: IPQ_UNLOCK();
1.16 cgd 667: goto bad;
668: }
669: }
1.1 cgd 670: ip->ip_off <<= 3;
671:
672: /*
673: * If datagram marked as having more fragments
674: * or if this is not the first fragment,
675: * attempt reassembly; if it succeeds, proceed.
676: */
1.25 cgd 677: if (mff || ip->ip_off) {
1.1 cgd 678: ipstat.ips_fragments++;
1.72 thorpej 679: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 680: if (ipqe == NULL) {
681: ipstat.ips_rcvmemdrop++;
1.75 thorpej 682: IPQ_UNLOCK();
1.25 cgd 683: goto bad;
684: }
685: ipqe->ipqe_mff = mff;
1.50 thorpej 686: ipqe->ipqe_m = m;
1.25 cgd 687: ipqe->ipqe_ip = ip;
1.50 thorpej 688: m = ip_reass(ipqe, fp);
1.75 thorpej 689: if (m == 0) {
690: IPQ_UNLOCK();
1.89 itojun 691: return;
1.75 thorpej 692: }
1.13 mycroft 693: ipstat.ips_reassembled++;
1.50 thorpej 694: ip = mtod(m, struct ip *);
1.74 thorpej 695: hlen = ip->ip_hl << 2;
1.79 mycroft 696: ip->ip_len += hlen;
1.1 cgd 697: } else
698: if (fp)
699: ip_freef(fp);
1.75 thorpej 700: IPQ_UNLOCK();
1.79 mycroft 701: }
1.114.4.4 he 702:
703: #ifdef IPSEC
704: /*
705: * enforce IPsec policy checking if we are seeing last header.
706: * note that we do not visit this with protocols with pcb layer
707: * code - like udp/tcp/raw ip.
708: */
709: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
710: ipsec4_in_reject(m, NULL)) {
711: ipsecstat.in_polvio++;
712: goto bad;
713: }
714: #endif
1.1 cgd 715:
716: /*
717: * Switch out to protocol's input routine.
718: */
1.82 aidan 719: #if IFA_STATS
720: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
721: #endif
1.1 cgd 722: ipstat.ips_delivered++;
1.89 itojun 723: {
724: int off = hlen, nh = ip->ip_p;
725:
726: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
727: return;
728: }
1.1 cgd 729: bad:
730: m_freem(m);
731: }
732:
733: /*
734: * Take incoming datagram fragment and try to
735: * reassemble it into whole datagram. If a chain for
736: * reassembly of this datagram already exists, then it
737: * is given as fp; otherwise have to make a chain.
738: */
1.50 thorpej 739: struct mbuf *
1.25 cgd 740: ip_reass(ipqe, fp)
1.109 augustss 741: struct ipqent *ipqe;
742: struct ipq *fp;
1.1 cgd 743: {
1.109 augustss 744: struct mbuf *m = ipqe->ipqe_m;
745: struct ipqent *nq, *p, *q;
1.25 cgd 746: struct ip *ip;
1.1 cgd 747: struct mbuf *t;
1.25 cgd 748: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 749: int i, next;
750:
1.75 thorpej 751: IPQ_LOCK_CHECK();
752:
1.1 cgd 753: /*
754: * Presence of header sizes in mbufs
755: * would confuse code below.
756: */
757: m->m_data += hlen;
758: m->m_len -= hlen;
759:
760: /*
761: * If first fragment to arrive, create a reassembly queue.
762: */
763: if (fp == 0) {
1.114.4.6! he 764: /*
! 765: * Enforce upper bound on number of fragmented packets
! 766: * for which we attempt reassembly;
! 767: * If maxfrag is 0, never accept fragments.
! 768: * If maxfrag is -1, accept all fragments without limitation.
! 769: */
! 770: if (ip_maxfragpackets < 0)
! 771: ;
! 772: else if (ip_nfragpackets >= ip_maxfragpackets)
! 773: goto dropfrag;
! 774: ip_nfragpackets++;
1.50 thorpej 775: MALLOC(fp, struct ipq *, sizeof (struct ipq),
776: M_FTABLE, M_NOWAIT);
777: if (fp == NULL)
1.1 cgd 778: goto dropfrag;
1.25 cgd 779: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 780: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 781: fp->ipq_p = ipqe->ipqe_ip->ip_p;
782: fp->ipq_id = ipqe->ipqe_ip->ip_id;
783: LIST_INIT(&fp->ipq_fragq);
784: fp->ipq_src = ipqe->ipqe_ip->ip_src;
785: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
786: p = NULL;
1.1 cgd 787: goto insert;
788: }
789:
790: /*
791: * Find a segment which begins after this one does.
792: */
1.25 cgd 793: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
794: p = q, q = q->ipqe_q.le_next)
795: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 796: break;
797:
798: /*
799: * If there is a preceding segment, it may provide some of
800: * our data already. If so, drop the data from the incoming
801: * segment. If it provides all of our data, drop us.
802: */
1.25 cgd 803: if (p != NULL) {
804: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
805: ipqe->ipqe_ip->ip_off;
1.1 cgd 806: if (i > 0) {
1.25 cgd 807: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 808: goto dropfrag;
1.50 thorpej 809: m_adj(ipqe->ipqe_m, i);
1.25 cgd 810: ipqe->ipqe_ip->ip_off += i;
811: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 812: }
813: }
814:
815: /*
816: * While we overlap succeeding segments trim them or,
817: * if they are completely covered, dequeue them.
818: */
1.25 cgd 819: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
820: q->ipqe_ip->ip_off; q = nq) {
821: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
822: q->ipqe_ip->ip_off;
823: if (i < q->ipqe_ip->ip_len) {
824: q->ipqe_ip->ip_len -= i;
825: q->ipqe_ip->ip_off += i;
1.50 thorpej 826: m_adj(q->ipqe_m, i);
1.1 cgd 827: break;
828: }
1.25 cgd 829: nq = q->ipqe_q.le_next;
1.50 thorpej 830: m_freem(q->ipqe_m);
1.25 cgd 831: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 832: pool_put(&ipqent_pool, q);
1.1 cgd 833: }
834:
835: insert:
836: /*
837: * Stick new segment in its place;
838: * check for complete reassembly.
839: */
1.25 cgd 840: if (p == NULL) {
841: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
842: } else {
843: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
844: }
1.1 cgd 845: next = 0;
1.25 cgd 846: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
847: p = q, q = q->ipqe_q.le_next) {
848: if (q->ipqe_ip->ip_off != next)
1.1 cgd 849: return (0);
1.25 cgd 850: next += q->ipqe_ip->ip_len;
1.1 cgd 851: }
1.25 cgd 852: if (p->ipqe_mff)
1.1 cgd 853: return (0);
854:
855: /*
1.41 thorpej 856: * Reassembly is complete. Check for a bogus message size and
857: * concatenate fragments.
1.1 cgd 858: */
1.25 cgd 859: q = fp->ipq_fragq.lh_first;
860: ip = q->ipqe_ip;
1.41 thorpej 861: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
862: ipstat.ips_toolong++;
863: ip_freef(fp);
864: return (0);
865: }
1.50 thorpej 866: m = q->ipqe_m;
1.1 cgd 867: t = m->m_next;
868: m->m_next = 0;
869: m_cat(m, t);
1.25 cgd 870: nq = q->ipqe_q.le_next;
1.72 thorpej 871: pool_put(&ipqent_pool, q);
1.25 cgd 872: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 873: t = q->ipqe_m;
1.25 cgd 874: nq = q->ipqe_q.le_next;
1.72 thorpej 875: pool_put(&ipqent_pool, q);
1.1 cgd 876: m_cat(m, t);
877: }
878:
879: /*
880: * Create header for new ip packet by
881: * modifying header of first packet;
882: * dequeue and discard fragment reassembly header.
883: * Make header visible.
884: */
885: ip->ip_len = next;
1.25 cgd 886: ip->ip_src = fp->ipq_src;
887: ip->ip_dst = fp->ipq_dst;
888: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 889: FREE(fp, M_FTABLE);
1.114.4.6! he 890: ip_nfragpackets--;
1.1 cgd 891: m->m_len += (ip->ip_hl << 2);
892: m->m_data -= (ip->ip_hl << 2);
893: /* some debugging cruft by sklower, below, will go away soon */
894: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 895: int plen = 0;
1.50 thorpej 896: for (t = m; t; t = t->m_next)
897: plen += t->m_len;
898: m->m_pkthdr.len = plen;
1.1 cgd 899: }
1.50 thorpej 900: return (m);
1.1 cgd 901:
902: dropfrag:
903: ipstat.ips_fragdropped++;
904: m_freem(m);
1.72 thorpej 905: pool_put(&ipqent_pool, ipqe);
1.1 cgd 906: return (0);
907: }
908:
909: /*
910: * Free a fragment reassembly header and all
911: * associated datagrams.
912: */
1.8 mycroft 913: void
1.1 cgd 914: ip_freef(fp)
915: struct ipq *fp;
916: {
1.109 augustss 917: struct ipqent *q, *p;
1.1 cgd 918:
1.75 thorpej 919: IPQ_LOCK_CHECK();
920:
1.25 cgd 921: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
922: p = q->ipqe_q.le_next;
1.50 thorpej 923: m_freem(q->ipqe_m);
1.25 cgd 924: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 925: pool_put(&ipqent_pool, q);
1.1 cgd 926: }
1.25 cgd 927: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 928: FREE(fp, M_FTABLE);
1.114.4.6! he 929: ip_nfragpackets--;
1.1 cgd 930: }
931:
932: /*
933: * IP timer processing;
934: * if a timer expires on a reassembly
935: * queue, discard it.
936: */
1.8 mycroft 937: void
1.1 cgd 938: ip_slowtimo()
939: {
1.109 augustss 940: struct ipq *fp, *nfp;
1.24 mycroft 941: int s = splsoftnet();
1.1 cgd 942:
1.75 thorpej 943: IPQ_LOCK();
1.25 cgd 944: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
945: nfp = fp->ipq_q.le_next;
946: if (--fp->ipq_ttl == 0) {
1.1 cgd 947: ipstat.ips_fragtimeout++;
1.25 cgd 948: ip_freef(fp);
1.1 cgd 949: }
950: }
1.114.4.6! he 951: /*
! 952: * If we are over the maximum number of fragments
! 953: * (due to the limit being lowered), drain off
! 954: * enough to get down to the new limit.
! 955: */
! 956: if (ip_maxfragpackets < 0)
! 957: ;
! 958: else {
! 959: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
! 960: ip_freef(ipq.lh_first);
! 961: }
1.75 thorpej 962: IPQ_UNLOCK();
1.63 matt 963: #ifdef GATEWAY
964: ipflow_slowtimo();
965: #endif
1.1 cgd 966: splx(s);
967: }
968:
969: /*
970: * Drain off all datagram fragments.
971: */
1.8 mycroft 972: void
1.1 cgd 973: ip_drain()
974: {
975:
1.75 thorpej 976: /*
977: * We may be called from a device's interrupt context. If
978: * the ipq is already busy, just bail out now.
979: */
980: if (ipq_lock_try() == 0)
981: return;
982:
1.25 cgd 983: while (ipq.lh_first != NULL) {
1.1 cgd 984: ipstat.ips_fragdropped++;
1.25 cgd 985: ip_freef(ipq.lh_first);
1.1 cgd 986: }
1.75 thorpej 987:
988: IPQ_UNLOCK();
1.1 cgd 989: }
990:
991: /*
992: * Do option processing on a datagram,
993: * possibly discarding it if bad options are encountered,
994: * or forwarding it if source-routed.
995: * Returns 1 if packet has been forwarded/freed,
996: * 0 if the packet should be processed further.
997: */
1.8 mycroft 998: int
1.1 cgd 999: ip_dooptions(m)
1000: struct mbuf *m;
1001: {
1.109 augustss 1002: struct ip *ip = mtod(m, struct ip *);
1003: u_char *cp, *cp0;
1004: struct ip_timestamp *ipt;
1005: struct in_ifaddr *ia;
1.1 cgd 1006: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1007: struct in_addr dst;
1.1 cgd 1008: n_time ntime;
1009:
1.13 mycroft 1010: dst = ip->ip_dst;
1.1 cgd 1011: cp = (u_char *)(ip + 1);
1012: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1013: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1014: opt = cp[IPOPT_OPTVAL];
1015: if (opt == IPOPT_EOL)
1016: break;
1017: if (opt == IPOPT_NOP)
1018: optlen = 1;
1019: else {
1.113 itojun 1020: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1021: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1022: goto bad;
1023: }
1.1 cgd 1024: optlen = cp[IPOPT_OLEN];
1.114 itojun 1025: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1026: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1027: goto bad;
1028: }
1029: }
1030: switch (opt) {
1031:
1032: default:
1033: break;
1034:
1035: /*
1036: * Source routing with record.
1037: * Find interface with current destination address.
1038: * If none on this machine then drop if strictly routed,
1039: * or do nothing if loosely routed.
1040: * Record interface address and bring up next address
1041: * component. If strictly routed make sure next
1042: * address is on directly accessible net.
1043: */
1044: case IPOPT_LSRR:
1045: case IPOPT_SSRR:
1.47 cjs 1046: if (ip_allowsrcrt == 0) {
1047: type = ICMP_UNREACH;
1048: code = ICMP_UNREACH_NET_PROHIB;
1049: goto bad;
1050: }
1.114 itojun 1051: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1052: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1053: goto bad;
1054: }
1.1 cgd 1055: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1056: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1057: goto bad;
1058: }
1059: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1060: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1061: if (ia == 0) {
1062: if (opt == IPOPT_SSRR) {
1063: type = ICMP_UNREACH;
1064: code = ICMP_UNREACH_SRCFAIL;
1065: goto bad;
1066: }
1067: /*
1068: * Loose routing, and not at next destination
1069: * yet; nothing to do except forward.
1070: */
1071: break;
1072: }
1073: off--; /* 0 origin */
1.112 sommerfe 1074: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1075: /*
1076: * End of source route. Should be for us.
1077: */
1078: save_rte(cp, ip->ip_src);
1079: break;
1080: }
1081: /*
1082: * locate outgoing interface
1083: */
1084: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1085: sizeof(ipaddr.sin_addr));
1.96 thorpej 1086: if (opt == IPOPT_SSRR)
1087: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1088: else
1.1 cgd 1089: ia = ip_rtaddr(ipaddr.sin_addr);
1090: if (ia == 0) {
1091: type = ICMP_UNREACH;
1092: code = ICMP_UNREACH_SRCFAIL;
1093: goto bad;
1094: }
1095: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1096: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1097: (caddr_t)(cp + off), sizeof(struct in_addr));
1098: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1099: /*
1100: * Let ip_intr's mcast routing check handle mcast pkts
1101: */
1.18 mycroft 1102: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1103: break;
1104:
1105: case IPOPT_RR:
1.114 itojun 1106: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1107: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1108: goto bad;
1109: }
1.1 cgd 1110: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1111: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1112: goto bad;
1113: }
1114: /*
1115: * If no space remains, ignore.
1116: */
1117: off--; /* 0 origin */
1.112 sommerfe 1118: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1119: break;
1120: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1121: sizeof(ipaddr.sin_addr));
1122: /*
1123: * locate outgoing interface; if we're the destination,
1124: * use the incoming interface (should be same).
1125: */
1.96 thorpej 1126: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1127: == NULL &&
1128: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1129: type = ICMP_UNREACH;
1130: code = ICMP_UNREACH_HOST;
1131: goto bad;
1132: }
1.20 mycroft 1133: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1134: (caddr_t)(cp + off), sizeof(struct in_addr));
1135: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1136: break;
1137:
1138: case IPOPT_TS:
1139: code = cp - (u_char *)ip;
1140: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1141: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1142: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1143: goto bad;
1.114 itojun 1144: }
1145: if (ipt->ipt_ptr < 5) {
1146: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1147: goto bad;
1148: }
1.15 cgd 1149: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1150: if (++ipt->ipt_oflw == 0) {
1151: code = (u_char *)&ipt->ipt_ptr -
1152: (u_char *)ip;
1.1 cgd 1153: goto bad;
1.114 itojun 1154: }
1.1 cgd 1155: break;
1156: }
1.104 thorpej 1157: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1158: switch (ipt->ipt_flg) {
1159:
1160: case IPOPT_TS_TSONLY:
1161: break;
1162:
1163: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1164: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1165: sizeof(struct in_addr) > ipt->ipt_len) {
1166: code = (u_char *)&ipt->ipt_ptr -
1167: (u_char *)ip;
1.1 cgd 1168: goto bad;
1.114 itojun 1169: }
1.13 mycroft 1170: ipaddr.sin_addr = dst;
1.96 thorpej 1171: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1172: m->m_pkthdr.rcvif));
1.13 mycroft 1173: if (ia == 0)
1174: continue;
1.104 thorpej 1175: bcopy(&ia->ia_addr.sin_addr,
1176: cp0, sizeof(struct in_addr));
1.1 cgd 1177: ipt->ipt_ptr += sizeof(struct in_addr);
1178: break;
1179:
1180: case IPOPT_TS_PRESPEC:
1.66 thorpej 1181: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1182: sizeof(struct in_addr) > ipt->ipt_len) {
1183: code = (u_char *)&ipt->ipt_ptr -
1184: (u_char *)ip;
1.1 cgd 1185: goto bad;
1.114 itojun 1186: }
1.104 thorpej 1187: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1188: sizeof(struct in_addr));
1.96 thorpej 1189: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1190: == NULL)
1.1 cgd 1191: continue;
1192: ipt->ipt_ptr += sizeof(struct in_addr);
1193: break;
1194:
1195: default:
1.114 itojun 1196: /* XXX can't take &ipt->ipt_flg */
1197: code = (u_char *)&ipt->ipt_ptr -
1198: (u_char *)ip + 1;
1.1 cgd 1199: goto bad;
1200: }
1201: ntime = iptime();
1.107 thorpej 1202: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1203: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1204: sizeof(n_time));
1205: ipt->ipt_ptr += sizeof(n_time);
1206: }
1207: }
1208: if (forward) {
1.26 thorpej 1209: if (ip_forwsrcrt == 0) {
1210: type = ICMP_UNREACH;
1211: code = ICMP_UNREACH_SRCFAIL;
1212: goto bad;
1213: }
1.1 cgd 1214: ip_forward(m, 1);
1215: return (1);
1.13 mycroft 1216: }
1217: return (0);
1.1 cgd 1218: bad:
1.13 mycroft 1219: icmp_error(m, type, code, 0, 0);
1220: ipstat.ips_badoptions++;
1.1 cgd 1221: return (1);
1222: }
1223:
1224: /*
1225: * Given address of next destination (final or next hop),
1226: * return internet address info of interface to be used to get there.
1227: */
1228: struct in_ifaddr *
1229: ip_rtaddr(dst)
1230: struct in_addr dst;
1231: {
1.109 augustss 1232: struct sockaddr_in *sin;
1.1 cgd 1233:
1.19 mycroft 1234: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1235:
1.35 mycroft 1236: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1237: if (ipforward_rt.ro_rt) {
1238: RTFREE(ipforward_rt.ro_rt);
1239: ipforward_rt.ro_rt = 0;
1240: }
1241: sin->sin_family = AF_INET;
1242: sin->sin_len = sizeof(*sin);
1243: sin->sin_addr = dst;
1244:
1245: rtalloc(&ipforward_rt);
1246: }
1247: if (ipforward_rt.ro_rt == 0)
1248: return ((struct in_ifaddr *)0);
1.19 mycroft 1249: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1250: }
1251:
1252: /*
1253: * Save incoming source route for use in replies,
1254: * to be picked up later by ip_srcroute if the receiver is interested.
1255: */
1.13 mycroft 1256: void
1.1 cgd 1257: save_rte(option, dst)
1258: u_char *option;
1259: struct in_addr dst;
1260: {
1261: unsigned olen;
1262:
1263: olen = option[IPOPT_OLEN];
1264: #ifdef DIAGNOSTIC
1265: if (ipprintfs)
1.39 christos 1266: printf("save_rte: olen %d\n", olen);
1.89 itojun 1267: #endif /* 0 */
1.1 cgd 1268: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1269: return;
1270: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1271: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1272: ip_srcrt.dst = dst;
1273: }
1274:
1275: /*
1276: * Retrieve incoming source route for use in replies,
1277: * in the same form used by setsockopt.
1278: * The first hop is placed before the options, will be removed later.
1279: */
1280: struct mbuf *
1281: ip_srcroute()
1282: {
1.109 augustss 1283: struct in_addr *p, *q;
1284: struct mbuf *m;
1.1 cgd 1285:
1286: if (ip_nhops == 0)
1287: return ((struct mbuf *)0);
1288: m = m_get(M_DONTWAIT, MT_SOOPTS);
1289: if (m == 0)
1290: return ((struct mbuf *)0);
1291:
1.13 mycroft 1292: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1293:
1294: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1295: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1296: OPTSIZ;
1297: #ifdef DIAGNOSTIC
1298: if (ipprintfs)
1.39 christos 1299: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1300: #endif
1301:
1302: /*
1303: * First save first hop for return route
1304: */
1305: p = &ip_srcrt.route[ip_nhops - 1];
1306: *(mtod(m, struct in_addr *)) = *p--;
1307: #ifdef DIAGNOSTIC
1308: if (ipprintfs)
1.39 christos 1309: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1310: #endif
1311:
1312: /*
1313: * Copy option fields and padding (nop) to mbuf.
1314: */
1315: ip_srcrt.nop = IPOPT_NOP;
1316: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1317: bcopy((caddr_t)&ip_srcrt.nop,
1318: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1319: q = (struct in_addr *)(mtod(m, caddr_t) +
1320: sizeof(struct in_addr) + OPTSIZ);
1321: #undef OPTSIZ
1322: /*
1323: * Record return path as an IP source route,
1324: * reversing the path (pointers are now aligned).
1325: */
1326: while (p >= ip_srcrt.route) {
1327: #ifdef DIAGNOSTIC
1328: if (ipprintfs)
1.39 christos 1329: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1330: #endif
1331: *q++ = *p--;
1332: }
1333: /*
1334: * Last hop goes to final destination.
1335: */
1336: *q = ip_srcrt.dst;
1337: #ifdef DIAGNOSTIC
1338: if (ipprintfs)
1.39 christos 1339: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1340: #endif
1341: return (m);
1342: }
1343:
1344: /*
1345: * Strip out IP options, at higher
1346: * level protocol in the kernel.
1347: * Second argument is buffer to which options
1348: * will be moved, and return value is their length.
1349: * XXX should be deleted; last arg currently ignored.
1350: */
1.8 mycroft 1351: void
1.1 cgd 1352: ip_stripoptions(m, mopt)
1.109 augustss 1353: struct mbuf *m;
1.1 cgd 1354: struct mbuf *mopt;
1355: {
1.109 augustss 1356: int i;
1.1 cgd 1357: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1358: caddr_t opts;
1.1 cgd 1359: int olen;
1360:
1.79 mycroft 1361: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1362: opts = (caddr_t)(ip + 1);
1363: i = m->m_len - (sizeof (struct ip) + olen);
1364: bcopy(opts + olen, opts, (unsigned)i);
1365: m->m_len -= olen;
1366: if (m->m_flags & M_PKTHDR)
1367: m->m_pkthdr.len -= olen;
1.79 mycroft 1368: ip->ip_len -= olen;
1369: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1370: }
1371:
1.23 mycroft 1372: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1373: 0, 0, 0, 0,
1374: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1375: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1376: EMSGSIZE, EHOSTUNREACH, 0, 0,
1377: 0, 0, 0, 0,
1378: ENOPROTOOPT
1379: };
1380:
1381: /*
1382: * Forward a packet. If some error occurs return the sender
1383: * an icmp packet. Note we can't always generate a meaningful
1384: * icmp message because icmp doesn't have a large enough repertoire
1385: * of codes and types.
1386: *
1387: * If not forwarding, just drop the packet. This could be confusing
1388: * if ipforwarding was zero but some routing protocol was advancing
1389: * us as a gateway to somewhere. However, we must let the routing
1390: * protocol deal with that.
1391: *
1392: * The srcrt parameter indicates whether the packet is being forwarded
1393: * via a source route.
1394: */
1.13 mycroft 1395: void
1.1 cgd 1396: ip_forward(m, srcrt)
1397: struct mbuf *m;
1398: int srcrt;
1399: {
1.109 augustss 1400: struct ip *ip = mtod(m, struct ip *);
1401: struct sockaddr_in *sin;
1402: struct rtentry *rt;
1.28 christos 1403: int error, type = 0, code = 0;
1.1 cgd 1404: struct mbuf *mcopy;
1.13 mycroft 1405: n_long dest;
1406: struct ifnet *destifp;
1.89 itojun 1407: #ifdef IPSEC
1408: struct ifnet dummyifp;
1409: #endif
1.1 cgd 1410:
1.13 mycroft 1411: dest = 0;
1.1 cgd 1412: #ifdef DIAGNOSTIC
1413: if (ipprintfs)
1.70 thorpej 1414: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1415: ntohl(ip->ip_src.s_addr),
1416: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1417: #endif
1.93 sommerfe 1418: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1419: ipstat.ips_cantforward++;
1420: m_freem(m);
1421: return;
1422: }
1423: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1424: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1425: return;
1426: }
1427: ip->ip_ttl -= IPTTLDEC;
1428:
1.19 mycroft 1429: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1430: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1431: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1432: if (ipforward_rt.ro_rt) {
1433: RTFREE(ipforward_rt.ro_rt);
1434: ipforward_rt.ro_rt = 0;
1435: }
1436: sin->sin_family = AF_INET;
1.35 mycroft 1437: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1438: sin->sin_addr = ip->ip_dst;
1439:
1440: rtalloc(&ipforward_rt);
1441: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1442: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1443: return;
1444: }
1445: rt = ipforward_rt.ro_rt;
1446: }
1447:
1448: /*
1.34 mycroft 1449: * Save at most 68 bytes of the packet in case
1.1 cgd 1450: * we need to generate an ICMP message to the src.
1.114.4.3 tv 1451: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1452: */
1.114.4.3 tv 1453: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1454: if (mcopy)
1455: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1456:
1457: /*
1458: * If forwarding packet using same interface that it came in on,
1459: * perhaps should send a redirect to sender to shortcut a hop.
1460: * Only send redirect if source is sending directly to us,
1461: * and if packet was not source routed (or has any options).
1462: * Also, don't send redirect if forwarding using a default route
1463: * or a route modified by a redirect.
1464: */
1465: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1466: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1467: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1468: ipsendredirects && !srcrt) {
1.19 mycroft 1469: if (rt->rt_ifa &&
1470: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1471: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1472: if (rt->rt_flags & RTF_GATEWAY)
1473: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1474: else
1475: dest = ip->ip_dst.s_addr;
1476: /*
1477: * Router requirements says to only send host
1478: * redirects.
1479: */
1480: type = ICMP_REDIRECT;
1481: code = ICMP_REDIRECT_HOST;
1.1 cgd 1482: #ifdef DIAGNOSTIC
1.77 thorpej 1483: if (ipprintfs)
1484: printf("redirect (%d) to %x\n", code,
1485: (u_int32_t)dest);
1.1 cgd 1486: #endif
1487: }
1488: }
1489:
1.89 itojun 1490: #ifdef IPSEC
1.103 itojun 1491: /* Don't lookup socket in forwading case */
1.114.4.5 he 1492: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1493: #endif
1.27 thorpej 1494: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1495: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1496: if (error)
1497: ipstat.ips_cantforward++;
1498: else {
1499: ipstat.ips_forward++;
1500: if (type)
1501: ipstat.ips_redirectsent++;
1502: else {
1.63 matt 1503: if (mcopy) {
1504: #ifdef GATEWAY
1.64 thorpej 1505: if (mcopy->m_flags & M_CANFASTFWD)
1506: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1507: #endif
1.1 cgd 1508: m_freem(mcopy);
1.63 matt 1509: }
1.1 cgd 1510: return;
1511: }
1512: }
1513: if (mcopy == NULL)
1514: return;
1.13 mycroft 1515: destifp = NULL;
1516:
1.1 cgd 1517: switch (error) {
1518:
1519: case 0: /* forwarded, but need redirect */
1520: /* type, code set above */
1521: break;
1522:
1523: case ENETUNREACH: /* shouldn't happen, checked above */
1524: case EHOSTUNREACH:
1525: case ENETDOWN:
1526: case EHOSTDOWN:
1527: default:
1528: type = ICMP_UNREACH;
1529: code = ICMP_UNREACH_HOST;
1530: break;
1531:
1532: case EMSGSIZE:
1533: type = ICMP_UNREACH;
1534: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1535: #ifndef IPSEC
1.13 mycroft 1536: if (ipforward_rt.ro_rt)
1537: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1538: #else
1539: /*
1540: * If the packet is routed over IPsec tunnel, tell the
1541: * originator the tunnel MTU.
1542: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1543: * XXX quickhack!!!
1544: */
1545: if (ipforward_rt.ro_rt) {
1546: struct secpolicy *sp;
1547: int ipsecerror;
1.95 itojun 1548: size_t ipsechdr;
1.89 itojun 1549: struct route *ro;
1550:
1551: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1552: IPSEC_DIR_OUTBOUND,
1553: IP_FORWARDING,
1554: &ipsecerror);
1.89 itojun 1555:
1556: if (sp == NULL)
1557: destifp = ipforward_rt.ro_rt->rt_ifp;
1558: else {
1559: /* count IPsec header size */
1.95 itojun 1560: ipsechdr = ipsec4_hdrsiz(mcopy,
1561: IPSEC_DIR_OUTBOUND,
1562: NULL);
1.89 itojun 1563:
1564: /*
1565: * find the correct route for outer IPv4
1566: * header, compute tunnel MTU.
1567: *
1568: * XXX BUG ALERT
1569: * The "dummyifp" code relies upon the fact
1570: * that icmp_error() touches only ifp->if_mtu.
1571: */
1572: /*XXX*/
1573: destifp = NULL;
1574: if (sp->req != NULL
1.95 itojun 1575: && sp->req->sav != NULL
1576: && sp->req->sav->sah != NULL) {
1577: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1578: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1579: dummyifp.if_mtu =
1580: ro->ro_rt->rt_ifp->if_mtu;
1581: dummyifp.if_mtu -= ipsechdr;
1582: destifp = &dummyifp;
1583: }
1584: }
1585:
1586: key_freesp(sp);
1587: }
1588: }
1589: #endif /*IPSEC*/
1.1 cgd 1590: ipstat.ips_cantfrag++;
1591: break;
1592:
1593: case ENOBUFS:
1594: type = ICMP_SOURCEQUENCH;
1595: code = 0;
1596: break;
1597: }
1.13 mycroft 1598: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1599: }
1600:
1601: void
1602: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1603: struct inpcb *inp;
1604: struct mbuf **mp;
1605: struct ip *ip;
1606: struct mbuf *m;
1.44 thorpej 1607: {
1608:
1609: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1610: struct timeval tv;
1611:
1612: microtime(&tv);
1613: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1614: SCM_TIMESTAMP, SOL_SOCKET);
1615: if (*mp)
1616: mp = &(*mp)->m_next;
1617: }
1618: if (inp->inp_flags & INP_RECVDSTADDR) {
1619: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1620: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1621: if (*mp)
1622: mp = &(*mp)->m_next;
1623: }
1624: #ifdef notyet
1625: /*
1626: * XXX
1627: * Moving these out of udp_input() made them even more broken
1628: * than they already were.
1629: * - fenner@parc.xerox.com
1630: */
1631: /* options were tossed already */
1632: if (inp->inp_flags & INP_RECVOPTS) {
1633: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1634: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1635: if (*mp)
1636: mp = &(*mp)->m_next;
1637: }
1638: /* ip_srcroute doesn't do what we want here, need to fix */
1639: if (inp->inp_flags & INP_RECVRETOPTS) {
1640: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1641: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1642: if (*mp)
1643: mp = &(*mp)->m_next;
1644: }
1645: #endif
1646: if (inp->inp_flags & INP_RECVIF) {
1647: struct sockaddr_dl sdl;
1648:
1649: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1650: sdl.sdl_family = AF_LINK;
1651: sdl.sdl_index = m->m_pkthdr.rcvif ?
1652: m->m_pkthdr.rcvif->if_index : 0;
1653: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1654: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1655: IP_RECVIF, IPPROTO_IP);
1656: if (*mp)
1657: mp = &(*mp)->m_next;
1658: }
1.13 mycroft 1659: }
1660:
1661: int
1662: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1663: int *name;
1664: u_int namelen;
1665: void *oldp;
1666: size_t *oldlenp;
1667: void *newp;
1668: size_t newlen;
1669: {
1.88 sommerfe 1670: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1671:
1.54 lukem 1672: int error, old;
1673:
1.13 mycroft 1674: /* All sysctl names at this level are terminal. */
1675: if (namelen != 1)
1676: return (ENOTDIR);
1677:
1678: switch (name[0]) {
1679: case IPCTL_FORWARDING:
1680: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1681: case IPCTL_SENDREDIRECTS:
1682: return (sysctl_int(oldp, oldlenp, newp, newlen,
1683: &ipsendredirects));
1684: case IPCTL_DEFTTL:
1685: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1686: #ifdef notyet
1687: case IPCTL_DEFMTU:
1688: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1689: #endif
1.26 thorpej 1690: case IPCTL_FORWSRCRT:
1.47 cjs 1691: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1692: if (securelevel > 0)
1.46 cjs 1693: return (sysctl_rdint(oldp, oldlenp, newp,
1694: ip_forwsrcrt));
1695: else
1696: return (sysctl_int(oldp, oldlenp, newp, newlen,
1697: &ip_forwsrcrt));
1.27 thorpej 1698: case IPCTL_DIRECTEDBCAST:
1699: return (sysctl_int(oldp, oldlenp, newp, newlen,
1700: &ip_directedbcast));
1.47 cjs 1701: case IPCTL_ALLOWSRCRT:
1702: return (sysctl_int(oldp, oldlenp, newp, newlen,
1703: &ip_allowsrcrt));
1.52 thorpej 1704: case IPCTL_SUBNETSARELOCAL:
1705: return (sysctl_int(oldp, oldlenp, newp, newlen,
1706: &subnetsarelocal));
1.53 kml 1707: case IPCTL_MTUDISC:
1.60 kml 1708: error = sysctl_int(oldp, oldlenp, newp, newlen,
1709: &ip_mtudisc);
1710: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1711: ip_mtudisc_timeout_q =
1712: rt_timer_queue_create(ip_mtudisc_timeout);
1713: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1714: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1715: ip_mtudisc_timeout_q = NULL;
1716: }
1717: return error;
1.54 lukem 1718: case IPCTL_ANONPORTMIN:
1719: old = anonportmin;
1720: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.114.4.2 itojun 1721: if (anonportmin >= anonportmax || anonportmin < 0
1722: || anonportmin > 65535
1.54 lukem 1723: #ifndef IPNOPRIVPORTS
1724: || anonportmin < IPPORT_RESERVED
1725: #endif
1726: ) {
1727: anonportmin = old;
1728: return (EINVAL);
1729: }
1730: return (error);
1731: case IPCTL_ANONPORTMAX:
1732: old = anonportmax;
1733: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.114.4.2 itojun 1734: if (anonportmin >= anonportmax || anonportmax < 0
1735: || anonportmax > 65535
1.54 lukem 1736: #ifndef IPNOPRIVPORTS
1737: || anonportmax < IPPORT_RESERVED
1738: #endif
1739: ) {
1740: anonportmax = old;
1741: return (EINVAL);
1742: }
1.60 kml 1743: return (error);
1744: case IPCTL_MTUDISCTIMEOUT:
1745: error = sysctl_int(oldp, oldlenp, newp, newlen,
1746: &ip_mtudisc_timeout);
1747: if (ip_mtudisc_timeout_q != NULL)
1748: rt_timer_queue_change(ip_mtudisc_timeout_q,
1749: ip_mtudisc_timeout);
1.54 lukem 1750: return (error);
1.65 matt 1751: #ifdef GATEWAY
1752: case IPCTL_MAXFLOWS:
1.67 thorpej 1753: {
1754: int s;
1755:
1.65 matt 1756: error = sysctl_int(oldp, oldlenp, newp, newlen,
1757: &ip_maxflows);
1.67 thorpej 1758: s = splsoftnet();
1.65 matt 1759: ipflow_reap(0);
1.67 thorpej 1760: splx(s);
1.65 matt 1761: return (error);
1.67 thorpej 1762: }
1.89 itojun 1763: #endif
1.90 itojun 1764: case IPCTL_HOSTZEROBROADCAST:
1765: return (sysctl_int(oldp, oldlenp, newp, newlen,
1766: &hostzeroisbroadcast));
1.89 itojun 1767: #if NGIF > 0
1768: case IPCTL_GIF_TTL:
1769: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1770: &ip_gif_ttl));
1.114.4.1 tron 1771: #endif
1772:
1773: #ifndef IPNOPRIVPORTS
1774: case IPCTL_LOWPORTMIN:
1775: old = lowportmin;
1776: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1777: if (lowportmin >= lowportmax
1778: || lowportmin > IPPORT_RESERVEDMAX
1779: || lowportmin < IPPORT_RESERVEDMIN
1780: ) {
1781: lowportmin = old;
1782: return (EINVAL);
1783: }
1784: return (error);
1785: case IPCTL_LOWPORTMAX:
1786: old = lowportmax;
1787: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1788: if (lowportmin >= lowportmax
1789: || lowportmax > IPPORT_RESERVEDMAX
1790: || lowportmax < IPPORT_RESERVEDMIN
1791: ) {
1792: lowportmax = old;
1793: return (EINVAL);
1794: }
1795: return (error);
1.65 matt 1796: #endif
1.114.4.6! he 1797:
! 1798: case IPCTL_MAXFRAGPACKETS:
! 1799: return (sysctl_int(oldp, oldlenp, newp, newlen,
! 1800: &ip_maxfragpackets));
1.88 sommerfe 1801:
1.13 mycroft 1802: default:
1803: return (EOPNOTSUPP);
1804: }
1805: /* NOTREACHED */
1.1 cgd 1806: }
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