Annotation of src/sys/netinet/ip_input.c, Revision 1.114.4.8
1.114.4.8! he 1: /* $NetBSD: ip_input.c,v 1.114.4.7 2002/02/26 20:57:03 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"
1.114.4.7 he 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
1.89 itojun 147:
148: #ifdef IPSEC
149: #include <netinet6/ipsec.h>
150: #include <netkey/key.h>
151: #include <netkey/key_debug.h>
152: #endif
1.44 thorpej 153:
1.1 cgd 154: #ifndef IPFORWARDING
155: #ifdef GATEWAY
156: #define IPFORWARDING 1 /* forward IP packets not for us */
157: #else /* GATEWAY */
158: #define IPFORWARDING 0 /* don't forward IP packets not for us */
159: #endif /* GATEWAY */
160: #endif /* IPFORWARDING */
161: #ifndef IPSENDREDIRECTS
162: #define IPSENDREDIRECTS 1
163: #endif
1.26 thorpej 164: #ifndef IPFORWSRCRT
1.47 cjs 165: #define IPFORWSRCRT 1 /* forward source-routed packets */
166: #endif
167: #ifndef IPALLOWSRCRT
1.48 mrg 168: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 169: #endif
1.53 kml 170: #ifndef IPMTUDISC
171: #define IPMTUDISC 0
172: #endif
1.60 kml 173: #ifndef IPMTUDISCTIMEOUT
1.61 kml 174: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 175: #endif
1.53 kml 176:
1.27 thorpej 177: /*
178: * Note: DIRECTED_BROADCAST is handled this way so that previous
179: * configuration using this option will Just Work.
180: */
181: #ifndef IPDIRECTEDBCAST
182: #ifdef DIRECTED_BROADCAST
183: #define IPDIRECTEDBCAST 1
184: #else
185: #define IPDIRECTEDBCAST 0
186: #endif /* DIRECTED_BROADCAST */
187: #endif /* IPDIRECTEDBCAST */
1.1 cgd 188: int ipforwarding = IPFORWARDING;
189: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 190: int ip_defttl = IPDEFTTL;
1.26 thorpej 191: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 192: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 193: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 194: int ip_mtudisc = IPMTUDISC;
1.60 kml 195: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 196: #ifdef DIAGNOSTIC
197: int ipprintfs = 0;
198: #endif
199:
1.60 kml 200: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
201:
1.1 cgd 202: extern struct domain inetdomain;
203: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 204: struct in_ifaddrhead in_ifaddr;
1.57 tls 205: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 206: struct ifqueue ipintrq;
1.63 matt 207: struct ipstat ipstat;
208: u_int16_t ip_id;
1.75 thorpej 209:
1.63 matt 210: struct ipqhead ipq;
1.75 thorpej 211: int ipq_locked;
1.114.4.6 he 212: int ip_nfragpackets = 0;
213: int ip_maxfragpackets = 200;
1.75 thorpej 214:
215: static __inline int ipq_lock_try __P((void));
216: static __inline void ipq_unlock __P((void));
217:
218: static __inline int
219: ipq_lock_try()
220: {
221: int s;
222:
223: s = splimp();
224: if (ipq_locked) {
225: splx(s);
226: return (0);
227: }
228: ipq_locked = 1;
229: splx(s);
230: return (1);
231: }
232:
233: static __inline void
234: ipq_unlock()
235: {
236: int s;
237:
238: s = splimp();
239: ipq_locked = 0;
240: splx(s);
241: }
242:
243: #ifdef DIAGNOSTIC
244: #define IPQ_LOCK() \
245: do { \
246: if (ipq_lock_try() == 0) { \
247: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
248: panic("ipq_lock"); \
249: } \
250: } while (0)
251: #define IPQ_LOCK_CHECK() \
252: do { \
253: if (ipq_locked == 0) { \
254: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
255: panic("ipq lock check"); \
256: } \
257: } while (0)
258: #else
259: #define IPQ_LOCK() (void) ipq_lock_try()
260: #define IPQ_LOCK_CHECK() /* nothing */
261: #endif
262:
263: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 264:
1.72 thorpej 265: struct pool ipqent_pool;
266:
1.1 cgd 267: /*
268: * We need to save the IP options in case a protocol wants to respond
269: * to an incoming packet over the same route if the packet got here
270: * using IP source routing. This allows connection establishment and
271: * maintenance when the remote end is on a network that is not known
272: * to us.
273: */
274: int ip_nhops = 0;
275: static struct ip_srcrt {
276: struct in_addr dst; /* final destination */
277: char nop; /* one NOP to align */
278: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
279: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
280: } ip_srcrt;
281:
1.13 mycroft 282: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 283:
1.1 cgd 284: /*
285: * IP initialization: fill in IP protocol switch table.
286: * All protocols not implemented in kernel go to raw IP protocol handler.
287: */
1.8 mycroft 288: void
1.1 cgd 289: ip_init()
290: {
1.109 augustss 291: struct protosw *pr;
292: int i;
1.1 cgd 293:
1.72 thorpej 294: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
295: 0, NULL, NULL, M_IPQ);
296:
1.1 cgd 297: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
298: if (pr == 0)
299: panic("ip_init");
300: for (i = 0; i < IPPROTO_MAX; i++)
301: ip_protox[i] = pr - inetsw;
302: for (pr = inetdomain.dom_protosw;
303: pr < inetdomain.dom_protoswNPROTOSW; pr++)
304: if (pr->pr_domain->dom_family == PF_INET &&
305: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
306: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 307: LIST_INIT(&ipq);
1.1 cgd 308: ip_id = time.tv_sec & 0xffff;
309: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 310: TAILQ_INIT(&in_ifaddr);
1.57 tls 311: in_ifaddrhashtbl =
312: hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60 kml 313: if (ip_mtudisc != 0)
314: ip_mtudisc_timeout_q =
315: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 316: #ifdef GATEWAY
317: ipflow_init();
318: #endif
1.1 cgd 319: }
320:
321: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
322: struct route ipforward_rt;
323:
324: /*
1.89 itojun 325: * IP software interrupt routine
326: */
327: void
328: ipintr()
329: {
330: int s;
331: struct mbuf *m;
332:
333: while (1) {
334: s = splimp();
335: IF_DEQUEUE(&ipintrq, m);
336: splx(s);
337: if (m == 0)
338: return;
339: ip_input(m);
340: }
341: }
342:
343: /*
1.1 cgd 344: * Ip input routine. Checksum and byte swap header. If fragmented
345: * try to reassemble. Process options. Pass to next level.
346: */
1.8 mycroft 347: void
1.89 itojun 348: ip_input(struct mbuf *m)
1.1 cgd 349: {
1.109 augustss 350: struct ip *ip = NULL;
351: struct ipq *fp;
352: struct in_ifaddr *ia;
353: struct ifaddr *ifa;
1.25 cgd 354: struct ipqent *ipqe;
1.89 itojun 355: int hlen = 0, mff, len;
1.100 itojun 356: int downmatch;
1.36 mrg 357: #ifdef PFIL_HOOKS
1.33 mrg 358: struct packet_filter_hook *pfh;
359: struct mbuf *m0;
1.43 mrg 360: int rv;
1.36 mrg 361: #endif /* PFIL_HOOKS */
1.1 cgd 362:
363: #ifdef DIAGNOSTIC
364: if ((m->m_flags & M_PKTHDR) == 0)
365: panic("ipintr no HDR");
366: #endif
1.89 itojun 367: #ifdef IPSEC
368: /*
369: * should the inner packet be considered authentic?
370: * see comment in ah4_input().
371: */
372: if (m) {
373: m->m_flags &= ~M_AUTHIPHDR;
374: m->m_flags &= ~M_AUTHIPDGM;
375: }
376: #endif
1.1 cgd 377: /*
378: * If no IP addresses have been set yet but the interfaces
379: * are receiving, can't do anything with incoming packets yet.
380: */
1.22 mycroft 381: if (in_ifaddr.tqh_first == 0)
1.1 cgd 382: goto bad;
383: ipstat.ips_total++;
384: if (m->m_len < sizeof (struct ip) &&
385: (m = m_pullup(m, sizeof (struct ip))) == 0) {
386: ipstat.ips_toosmall++;
1.89 itojun 387: return;
1.1 cgd 388: }
389: ip = mtod(m, struct ip *);
1.13 mycroft 390: if (ip->ip_v != IPVERSION) {
391: ipstat.ips_badvers++;
392: goto bad;
393: }
1.1 cgd 394: hlen = ip->ip_hl << 2;
395: if (hlen < sizeof(struct ip)) { /* minimum header length */
396: ipstat.ips_badhlen++;
397: goto bad;
398: }
399: if (hlen > m->m_len) {
400: if ((m = m_pullup(m, hlen)) == 0) {
401: ipstat.ips_badhlen++;
1.89 itojun 402: return;
1.1 cgd 403: }
404: ip = mtod(m, struct ip *);
405: }
1.98 thorpej 406:
1.85 hwr 407: /*
1.99 thorpej 408: * RFC1122: packets with a multicast source address are
1.98 thorpej 409: * not allowed.
1.85 hwr 410: */
411: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 412: /* XXX stat */
1.85 hwr 413: goto bad;
414: }
415:
1.78 mycroft 416: if (in_cksum(m, hlen) != 0) {
1.1 cgd 417: ipstat.ips_badsum++;
418: goto bad;
419: }
420:
421: /*
422: * Convert fields to host representation.
423: */
424: NTOHS(ip->ip_len);
425: NTOHS(ip->ip_off);
1.35 mycroft 426: len = ip->ip_len;
1.81 proff 427:
428: /*
429: * Check for additional length bogosity
430: */
1.84 proff 431: if (len < hlen) {
1.81 proff 432: ipstat.ips_badlen++;
433: goto bad;
434: }
1.1 cgd 435:
436: /*
437: * Check that the amount of data in the buffers
438: * is as at least much as the IP header would have us expect.
439: * Trim mbufs if longer than we expect.
440: * Drop packet if shorter than we expect.
441: */
1.35 mycroft 442: if (m->m_pkthdr.len < len) {
1.1 cgd 443: ipstat.ips_tooshort++;
444: goto bad;
445: }
1.35 mycroft 446: if (m->m_pkthdr.len > len) {
1.1 cgd 447: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 448: m->m_len = len;
449: m->m_pkthdr.len = len;
1.1 cgd 450: } else
1.35 mycroft 451: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 452: }
453:
1.94 itojun 454: #ifdef IPSEC
455: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
456: m->m_flags &= ~M_CANFASTFWD;
457: #else
1.64 thorpej 458: /*
459: * Assume that we can create a fast-forward IP flow entry
460: * based on this packet.
461: */
462: m->m_flags |= M_CANFASTFWD;
1.94 itojun 463: #endif
1.64 thorpej 464:
1.36 mrg 465: #ifdef PFIL_HOOKS
1.114.4.5 he 466: #ifdef IPSEC
467: /*
468: * let ipfilter look at packet on the wire,
469: * not the decapsulated packet.
470: */
471: if (ipsec_gethist(m, NULL))
472: goto nofilt;
473: #endif
1.33 mrg 474: /*
1.64 thorpej 475: * Run through list of hooks for input packets. If there are any
476: * filters which require that additional packets in the flow are
477: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
478: * Note that filters must _never_ set this flag, as another filter
479: * in the list may have previously cleared it.
1.33 mrg 480: */
481: m0 = m;
1.102 darrenr 482: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 483: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 484: if (pfh->pfil_func) {
1.101 darrenr 485: rv = pfh->pfil_func(ip, hlen,
486: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 487: if (rv)
1.89 itojun 488: return;
1.68 sommerfe 489: m = m0;
490: if (m == NULL)
1.89 itojun 491: return;
1.68 sommerfe 492: ip = mtod(m, struct ip *);
1.33 mrg 493: }
1.114.4.5 he 494: #ifdef IPSEC
495: nofilt:;
496: #endif
1.36 mrg 497: #endif /* PFIL_HOOKS */
1.33 mrg 498:
1.1 cgd 499: /*
500: * Process options and, if not destined for us,
501: * ship it on. ip_dooptions returns 1 when an
502: * error was detected (causing an icmp message
503: * to be sent and the original packet to be freed).
504: */
505: ip_nhops = 0; /* for source routed packets */
506: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 507: return;
1.1 cgd 508:
509: /*
510: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 511: *
512: * Traditional 4.4BSD did not consult IFF_UP at all.
513: * The behavior here is to treat addresses on !IFF_UP interface
514: * as not mine.
1.1 cgd 515: */
1.100 itojun 516: downmatch = 0;
1.97 itojun 517: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
518: ia != NULL;
519: ia = ia->ia_hash.le_next) {
520: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
521: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
522: break;
1.100 itojun 523: else
524: downmatch++;
1.97 itojun 525: }
526: }
1.86 thorpej 527: if (ia != NULL)
528: goto ours;
1.57 tls 529: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
530: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
531: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
532: if (ifa->ifa_addr->sa_family != AF_INET) continue;
533: ia = ifatoia(ifa);
1.35 mycroft 534: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
535: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 536: /*
537: * Look for all-0's host part (old broadcast addr),
538: * either for subnet or net.
539: */
540: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 541: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 542: goto ours;
1.57 tls 543: /*
544: * An interface with IP address zero accepts
545: * all packets that arrive on that interface.
546: */
547: if (in_nullhost(ia->ia_addr.sin_addr))
548: goto ours;
1.1 cgd 549: }
550: }
1.18 mycroft 551: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 552: struct in_multi *inm;
553: #ifdef MROUTING
554: extern struct socket *ip_mrouter;
1.10 brezak 555:
556: if (m->m_flags & M_EXT) {
557: if ((m = m_pullup(m, hlen)) == 0) {
558: ipstat.ips_toosmall++;
1.89 itojun 559: return;
1.10 brezak 560: }
561: ip = mtod(m, struct ip *);
562: }
1.4 hpeyerl 563:
564: if (ip_mrouter) {
565: /*
566: * If we are acting as a multicast router, all
567: * incoming multicast packets are passed to the
568: * kernel-level multicast forwarding function.
569: * The packet is returned (relatively) intact; if
570: * ip_mforward() returns a non-zero value, the packet
571: * must be discarded, else it may be accepted below.
572: *
573: * (The IP ident field is put in the same byte order
574: * as expected when ip_mforward() is called from
575: * ip_output().)
576: */
1.13 mycroft 577: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
578: ipstat.ips_cantforward++;
1.4 hpeyerl 579: m_freem(m);
1.89 itojun 580: return;
1.4 hpeyerl 581: }
582:
583: /*
584: * The process-level routing demon needs to receive
585: * all multicast IGMP packets, whether or not this
586: * host belongs to their destination groups.
587: */
588: if (ip->ip_p == IPPROTO_IGMP)
589: goto ours;
1.13 mycroft 590: ipstat.ips_forward++;
1.4 hpeyerl 591: }
592: #endif
593: /*
594: * See if we belong to the destination multicast group on the
595: * arrival interface.
596: */
597: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
598: if (inm == NULL) {
1.13 mycroft 599: ipstat.ips_cantforward++;
1.4 hpeyerl 600: m_freem(m);
1.89 itojun 601: return;
1.4 hpeyerl 602: }
603: goto ours;
604: }
1.19 mycroft 605: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 606: in_nullhost(ip->ip_dst))
1.1 cgd 607: goto ours;
608:
609: /*
610: * Not for us; forward if possible and desirable.
611: */
612: if (ipforwarding == 0) {
613: ipstat.ips_cantforward++;
614: m_freem(m);
1.100 itojun 615: } else {
616: /*
617: * If ip_dst matched any of my address on !IFF_UP interface,
618: * and there's no IFF_UP interface that matches ip_dst,
619: * send icmp unreach. Forwarding it will result in in-kernel
620: * forwarding loop till TTL goes to 0.
621: */
622: if (downmatch) {
623: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
624: ipstat.ips_cantforward++;
625: return;
626: }
1.114.4.8! he 627: #ifdef IPSEC
! 628: if (ipsec4_in_reject(m, NULL)) {
! 629: ipsecstat.in_polvio++;
! 630: goto bad;
! 631: }
! 632: #endif
! 633:
1.1 cgd 634: ip_forward(m, 0);
1.100 itojun 635: }
1.89 itojun 636: return;
1.1 cgd 637:
638: ours:
639: /*
640: * If offset or IP_MF are set, must reassemble.
641: * Otherwise, nothing need be done.
642: * (We could look in the reassembly queue to see
643: * if the packet was previously fragmented,
644: * but it's not worth the time; just let them time out.)
645: */
1.37 perry 646: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 647: /*
648: * Look for queue of fragments
649: * of this datagram.
650: */
1.75 thorpej 651: IPQ_LOCK();
1.25 cgd 652: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 653: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 654: in_hosteq(ip->ip_src, fp->ipq_src) &&
655: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 656: ip->ip_p == fp->ipq_p)
657: goto found;
658: fp = 0;
659: found:
660:
661: /*
662: * Adjust ip_len to not reflect header,
1.25 cgd 663: * set ipqe_mff if more fragments are expected,
1.1 cgd 664: * convert offset of this to bytes.
665: */
666: ip->ip_len -= hlen;
1.25 cgd 667: mff = (ip->ip_off & IP_MF) != 0;
668: if (mff) {
1.16 cgd 669: /*
670: * Make sure that fragments have a data length
671: * that's a non-zero multiple of 8 bytes.
672: */
1.17 cgd 673: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 674: ipstat.ips_badfrags++;
1.75 thorpej 675: IPQ_UNLOCK();
1.16 cgd 676: goto bad;
677: }
678: }
1.1 cgd 679: ip->ip_off <<= 3;
680:
681: /*
682: * If datagram marked as having more fragments
683: * or if this is not the first fragment,
684: * attempt reassembly; if it succeeds, proceed.
685: */
1.25 cgd 686: if (mff || ip->ip_off) {
1.1 cgd 687: ipstat.ips_fragments++;
1.72 thorpej 688: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 689: if (ipqe == NULL) {
690: ipstat.ips_rcvmemdrop++;
1.75 thorpej 691: IPQ_UNLOCK();
1.25 cgd 692: goto bad;
693: }
694: ipqe->ipqe_mff = mff;
1.50 thorpej 695: ipqe->ipqe_m = m;
1.25 cgd 696: ipqe->ipqe_ip = ip;
1.50 thorpej 697: m = ip_reass(ipqe, fp);
1.75 thorpej 698: if (m == 0) {
699: IPQ_UNLOCK();
1.89 itojun 700: return;
1.75 thorpej 701: }
1.13 mycroft 702: ipstat.ips_reassembled++;
1.50 thorpej 703: ip = mtod(m, struct ip *);
1.74 thorpej 704: hlen = ip->ip_hl << 2;
1.79 mycroft 705: ip->ip_len += hlen;
1.1 cgd 706: } else
707: if (fp)
708: ip_freef(fp);
1.75 thorpej 709: IPQ_UNLOCK();
1.79 mycroft 710: }
1.114.4.4 he 711:
712: #ifdef IPSEC
713: /*
714: * enforce IPsec policy checking if we are seeing last header.
715: * note that we do not visit this with protocols with pcb layer
716: * code - like udp/tcp/raw ip.
717: */
718: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
719: ipsec4_in_reject(m, NULL)) {
720: ipsecstat.in_polvio++;
721: goto bad;
722: }
723: #endif
1.1 cgd 724:
725: /*
726: * Switch out to protocol's input routine.
727: */
1.82 aidan 728: #if IFA_STATS
729: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
730: #endif
1.1 cgd 731: ipstat.ips_delivered++;
1.89 itojun 732: {
733: int off = hlen, nh = ip->ip_p;
734:
735: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
736: return;
737: }
1.1 cgd 738: bad:
739: m_freem(m);
740: }
741:
742: /*
743: * Take incoming datagram fragment and try to
744: * reassemble it into whole datagram. If a chain for
745: * reassembly of this datagram already exists, then it
746: * is given as fp; otherwise have to make a chain.
747: */
1.50 thorpej 748: struct mbuf *
1.25 cgd 749: ip_reass(ipqe, fp)
1.109 augustss 750: struct ipqent *ipqe;
751: struct ipq *fp;
1.1 cgd 752: {
1.109 augustss 753: struct mbuf *m = ipqe->ipqe_m;
754: struct ipqent *nq, *p, *q;
1.25 cgd 755: struct ip *ip;
1.1 cgd 756: struct mbuf *t;
1.25 cgd 757: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 758: int i, next;
759:
1.75 thorpej 760: IPQ_LOCK_CHECK();
761:
1.1 cgd 762: /*
763: * Presence of header sizes in mbufs
764: * would confuse code below.
765: */
766: m->m_data += hlen;
767: m->m_len -= hlen;
768:
769: /*
770: * If first fragment to arrive, create a reassembly queue.
771: */
772: if (fp == 0) {
1.114.4.6 he 773: /*
774: * Enforce upper bound on number of fragmented packets
775: * for which we attempt reassembly;
776: * If maxfrag is 0, never accept fragments.
777: * If maxfrag is -1, accept all fragments without limitation.
778: */
779: if (ip_maxfragpackets < 0)
780: ;
781: else if (ip_nfragpackets >= ip_maxfragpackets)
782: goto dropfrag;
783: ip_nfragpackets++;
1.50 thorpej 784: MALLOC(fp, struct ipq *, sizeof (struct ipq),
785: M_FTABLE, M_NOWAIT);
786: if (fp == NULL)
1.1 cgd 787: goto dropfrag;
1.25 cgd 788: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 789: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 790: fp->ipq_p = ipqe->ipqe_ip->ip_p;
791: fp->ipq_id = ipqe->ipqe_ip->ip_id;
792: LIST_INIT(&fp->ipq_fragq);
793: fp->ipq_src = ipqe->ipqe_ip->ip_src;
794: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
795: p = NULL;
1.1 cgd 796: goto insert;
797: }
798:
799: /*
800: * Find a segment which begins after this one does.
801: */
1.25 cgd 802: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
803: p = q, q = q->ipqe_q.le_next)
804: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 805: break;
806:
807: /*
808: * If there is a preceding segment, it may provide some of
809: * our data already. If so, drop the data from the incoming
810: * segment. If it provides all of our data, drop us.
811: */
1.25 cgd 812: if (p != NULL) {
813: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
814: ipqe->ipqe_ip->ip_off;
1.1 cgd 815: if (i > 0) {
1.25 cgd 816: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 817: goto dropfrag;
1.50 thorpej 818: m_adj(ipqe->ipqe_m, i);
1.25 cgd 819: ipqe->ipqe_ip->ip_off += i;
820: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 821: }
822: }
823:
824: /*
825: * While we overlap succeeding segments trim them or,
826: * if they are completely covered, dequeue them.
827: */
1.25 cgd 828: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
829: q->ipqe_ip->ip_off; q = nq) {
830: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
831: q->ipqe_ip->ip_off;
832: if (i < q->ipqe_ip->ip_len) {
833: q->ipqe_ip->ip_len -= i;
834: q->ipqe_ip->ip_off += i;
1.50 thorpej 835: m_adj(q->ipqe_m, i);
1.1 cgd 836: break;
837: }
1.25 cgd 838: nq = q->ipqe_q.le_next;
1.50 thorpej 839: m_freem(q->ipqe_m);
1.25 cgd 840: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 841: pool_put(&ipqent_pool, q);
1.1 cgd 842: }
843:
844: insert:
845: /*
846: * Stick new segment in its place;
847: * check for complete reassembly.
848: */
1.25 cgd 849: if (p == NULL) {
850: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
851: } else {
852: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
853: }
1.1 cgd 854: next = 0;
1.25 cgd 855: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
856: p = q, q = q->ipqe_q.le_next) {
857: if (q->ipqe_ip->ip_off != next)
1.1 cgd 858: return (0);
1.25 cgd 859: next += q->ipqe_ip->ip_len;
1.1 cgd 860: }
1.25 cgd 861: if (p->ipqe_mff)
1.1 cgd 862: return (0);
863:
864: /*
1.41 thorpej 865: * Reassembly is complete. Check for a bogus message size and
866: * concatenate fragments.
1.1 cgd 867: */
1.25 cgd 868: q = fp->ipq_fragq.lh_first;
869: ip = q->ipqe_ip;
1.41 thorpej 870: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
871: ipstat.ips_toolong++;
872: ip_freef(fp);
873: return (0);
874: }
1.50 thorpej 875: m = q->ipqe_m;
1.1 cgd 876: t = m->m_next;
877: m->m_next = 0;
878: m_cat(m, t);
1.25 cgd 879: nq = q->ipqe_q.le_next;
1.72 thorpej 880: pool_put(&ipqent_pool, q);
1.25 cgd 881: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 882: t = q->ipqe_m;
1.25 cgd 883: nq = q->ipqe_q.le_next;
1.72 thorpej 884: pool_put(&ipqent_pool, q);
1.1 cgd 885: m_cat(m, t);
886: }
887:
888: /*
889: * Create header for new ip packet by
890: * modifying header of first packet;
891: * dequeue and discard fragment reassembly header.
892: * Make header visible.
893: */
894: ip->ip_len = next;
1.25 cgd 895: ip->ip_src = fp->ipq_src;
896: ip->ip_dst = fp->ipq_dst;
897: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 898: FREE(fp, M_FTABLE);
1.114.4.6 he 899: ip_nfragpackets--;
1.1 cgd 900: m->m_len += (ip->ip_hl << 2);
901: m->m_data -= (ip->ip_hl << 2);
902: /* some debugging cruft by sklower, below, will go away soon */
903: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 904: int plen = 0;
1.50 thorpej 905: for (t = m; t; t = t->m_next)
906: plen += t->m_len;
907: m->m_pkthdr.len = plen;
1.1 cgd 908: }
1.50 thorpej 909: return (m);
1.1 cgd 910:
911: dropfrag:
912: ipstat.ips_fragdropped++;
913: m_freem(m);
1.72 thorpej 914: pool_put(&ipqent_pool, ipqe);
1.1 cgd 915: return (0);
916: }
917:
918: /*
919: * Free a fragment reassembly header and all
920: * associated datagrams.
921: */
1.8 mycroft 922: void
1.1 cgd 923: ip_freef(fp)
924: struct ipq *fp;
925: {
1.109 augustss 926: struct ipqent *q, *p;
1.1 cgd 927:
1.75 thorpej 928: IPQ_LOCK_CHECK();
929:
1.25 cgd 930: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
931: p = q->ipqe_q.le_next;
1.50 thorpej 932: m_freem(q->ipqe_m);
1.25 cgd 933: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 934: pool_put(&ipqent_pool, q);
1.1 cgd 935: }
1.25 cgd 936: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 937: FREE(fp, M_FTABLE);
1.114.4.6 he 938: ip_nfragpackets--;
1.1 cgd 939: }
940:
941: /*
942: * IP timer processing;
943: * if a timer expires on a reassembly
944: * queue, discard it.
945: */
1.8 mycroft 946: void
1.1 cgd 947: ip_slowtimo()
948: {
1.109 augustss 949: struct ipq *fp, *nfp;
1.24 mycroft 950: int s = splsoftnet();
1.1 cgd 951:
1.75 thorpej 952: IPQ_LOCK();
1.25 cgd 953: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
954: nfp = fp->ipq_q.le_next;
955: if (--fp->ipq_ttl == 0) {
1.1 cgd 956: ipstat.ips_fragtimeout++;
1.25 cgd 957: ip_freef(fp);
1.1 cgd 958: }
959: }
1.114.4.6 he 960: /*
961: * If we are over the maximum number of fragments
962: * (due to the limit being lowered), drain off
963: * enough to get down to the new limit.
964: */
965: if (ip_maxfragpackets < 0)
966: ;
967: else {
968: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
969: ip_freef(ipq.lh_first);
970: }
1.75 thorpej 971: IPQ_UNLOCK();
1.63 matt 972: #ifdef GATEWAY
973: ipflow_slowtimo();
974: #endif
1.1 cgd 975: splx(s);
976: }
977:
978: /*
979: * Drain off all datagram fragments.
980: */
1.8 mycroft 981: void
1.1 cgd 982: ip_drain()
983: {
984:
1.75 thorpej 985: /*
986: * We may be called from a device's interrupt context. If
987: * the ipq is already busy, just bail out now.
988: */
989: if (ipq_lock_try() == 0)
990: return;
991:
1.25 cgd 992: while (ipq.lh_first != NULL) {
1.1 cgd 993: ipstat.ips_fragdropped++;
1.25 cgd 994: ip_freef(ipq.lh_first);
1.1 cgd 995: }
1.75 thorpej 996:
997: IPQ_UNLOCK();
1.1 cgd 998: }
999:
1000: /*
1001: * Do option processing on a datagram,
1002: * possibly discarding it if bad options are encountered,
1003: * or forwarding it if source-routed.
1004: * Returns 1 if packet has been forwarded/freed,
1005: * 0 if the packet should be processed further.
1006: */
1.8 mycroft 1007: int
1.1 cgd 1008: ip_dooptions(m)
1009: struct mbuf *m;
1010: {
1.109 augustss 1011: struct ip *ip = mtod(m, struct ip *);
1012: u_char *cp, *cp0;
1013: struct ip_timestamp *ipt;
1014: struct in_ifaddr *ia;
1.1 cgd 1015: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1016: struct in_addr dst;
1.1 cgd 1017: n_time ntime;
1018:
1.13 mycroft 1019: dst = ip->ip_dst;
1.1 cgd 1020: cp = (u_char *)(ip + 1);
1021: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1022: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1023: opt = cp[IPOPT_OPTVAL];
1024: if (opt == IPOPT_EOL)
1025: break;
1026: if (opt == IPOPT_NOP)
1027: optlen = 1;
1028: else {
1.113 itojun 1029: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1030: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1031: goto bad;
1032: }
1.1 cgd 1033: optlen = cp[IPOPT_OLEN];
1.114 itojun 1034: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1035: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1036: goto bad;
1037: }
1038: }
1039: switch (opt) {
1040:
1041: default:
1042: break;
1043:
1044: /*
1045: * Source routing with record.
1046: * Find interface with current destination address.
1047: * If none on this machine then drop if strictly routed,
1048: * or do nothing if loosely routed.
1049: * Record interface address and bring up next address
1050: * component. If strictly routed make sure next
1051: * address is on directly accessible net.
1052: */
1053: case IPOPT_LSRR:
1054: case IPOPT_SSRR:
1.47 cjs 1055: if (ip_allowsrcrt == 0) {
1056: type = ICMP_UNREACH;
1057: code = ICMP_UNREACH_NET_PROHIB;
1058: goto bad;
1059: }
1.114 itojun 1060: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1061: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1062: goto bad;
1063: }
1.1 cgd 1064: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1065: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1066: goto bad;
1067: }
1068: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1069: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1070: if (ia == 0) {
1071: if (opt == IPOPT_SSRR) {
1072: type = ICMP_UNREACH;
1073: code = ICMP_UNREACH_SRCFAIL;
1074: goto bad;
1075: }
1076: /*
1077: * Loose routing, and not at next destination
1078: * yet; nothing to do except forward.
1079: */
1080: break;
1081: }
1082: off--; /* 0 origin */
1.112 sommerfe 1083: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1084: /*
1085: * End of source route. Should be for us.
1086: */
1087: save_rte(cp, ip->ip_src);
1088: break;
1089: }
1090: /*
1091: * locate outgoing interface
1092: */
1093: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1094: sizeof(ipaddr.sin_addr));
1.96 thorpej 1095: if (opt == IPOPT_SSRR)
1096: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1097: else
1.1 cgd 1098: ia = ip_rtaddr(ipaddr.sin_addr);
1099: if (ia == 0) {
1100: type = ICMP_UNREACH;
1101: code = ICMP_UNREACH_SRCFAIL;
1102: goto bad;
1103: }
1104: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1105: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1106: (caddr_t)(cp + off), sizeof(struct in_addr));
1107: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1108: /*
1109: * Let ip_intr's mcast routing check handle mcast pkts
1110: */
1.18 mycroft 1111: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1112: break;
1113:
1114: case IPOPT_RR:
1.114 itojun 1115: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1116: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1117: goto bad;
1118: }
1.1 cgd 1119: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1120: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1121: goto bad;
1122: }
1123: /*
1124: * If no space remains, ignore.
1125: */
1126: off--; /* 0 origin */
1.112 sommerfe 1127: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1128: break;
1129: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1130: sizeof(ipaddr.sin_addr));
1131: /*
1132: * locate outgoing interface; if we're the destination,
1133: * use the incoming interface (should be same).
1134: */
1.96 thorpej 1135: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1136: == NULL &&
1137: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1138: type = ICMP_UNREACH;
1139: code = ICMP_UNREACH_HOST;
1140: goto bad;
1141: }
1.20 mycroft 1142: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1143: (caddr_t)(cp + off), sizeof(struct in_addr));
1144: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1145: break;
1146:
1147: case IPOPT_TS:
1148: code = cp - (u_char *)ip;
1149: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1150: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1151: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1152: goto bad;
1.114 itojun 1153: }
1154: if (ipt->ipt_ptr < 5) {
1155: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1156: goto bad;
1157: }
1.15 cgd 1158: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1159: if (++ipt->ipt_oflw == 0) {
1160: code = (u_char *)&ipt->ipt_ptr -
1161: (u_char *)ip;
1.1 cgd 1162: goto bad;
1.114 itojun 1163: }
1.1 cgd 1164: break;
1165: }
1.104 thorpej 1166: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1167: switch (ipt->ipt_flg) {
1168:
1169: case IPOPT_TS_TSONLY:
1170: break;
1171:
1172: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1173: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1174: sizeof(struct in_addr) > ipt->ipt_len) {
1175: code = (u_char *)&ipt->ipt_ptr -
1176: (u_char *)ip;
1.1 cgd 1177: goto bad;
1.114 itojun 1178: }
1.13 mycroft 1179: ipaddr.sin_addr = dst;
1.96 thorpej 1180: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1181: m->m_pkthdr.rcvif));
1.13 mycroft 1182: if (ia == 0)
1183: continue;
1.104 thorpej 1184: bcopy(&ia->ia_addr.sin_addr,
1185: cp0, sizeof(struct in_addr));
1.1 cgd 1186: ipt->ipt_ptr += sizeof(struct in_addr);
1187: break;
1188:
1189: case IPOPT_TS_PRESPEC:
1.66 thorpej 1190: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1191: sizeof(struct in_addr) > ipt->ipt_len) {
1192: code = (u_char *)&ipt->ipt_ptr -
1193: (u_char *)ip;
1.1 cgd 1194: goto bad;
1.114 itojun 1195: }
1.104 thorpej 1196: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1197: sizeof(struct in_addr));
1.96 thorpej 1198: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1199: == NULL)
1.1 cgd 1200: continue;
1201: ipt->ipt_ptr += sizeof(struct in_addr);
1202: break;
1203:
1204: default:
1.114 itojun 1205: /* XXX can't take &ipt->ipt_flg */
1206: code = (u_char *)&ipt->ipt_ptr -
1207: (u_char *)ip + 1;
1.1 cgd 1208: goto bad;
1209: }
1210: ntime = iptime();
1.107 thorpej 1211: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1212: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1213: sizeof(n_time));
1214: ipt->ipt_ptr += sizeof(n_time);
1215: }
1216: }
1217: if (forward) {
1.26 thorpej 1218: if (ip_forwsrcrt == 0) {
1219: type = ICMP_UNREACH;
1220: code = ICMP_UNREACH_SRCFAIL;
1221: goto bad;
1222: }
1.1 cgd 1223: ip_forward(m, 1);
1224: return (1);
1.13 mycroft 1225: }
1226: return (0);
1.1 cgd 1227: bad:
1.13 mycroft 1228: icmp_error(m, type, code, 0, 0);
1229: ipstat.ips_badoptions++;
1.1 cgd 1230: return (1);
1231: }
1232:
1233: /*
1234: * Given address of next destination (final or next hop),
1235: * return internet address info of interface to be used to get there.
1236: */
1237: struct in_ifaddr *
1238: ip_rtaddr(dst)
1239: struct in_addr dst;
1240: {
1.109 augustss 1241: struct sockaddr_in *sin;
1.1 cgd 1242:
1.19 mycroft 1243: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1244:
1.35 mycroft 1245: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1246: if (ipforward_rt.ro_rt) {
1247: RTFREE(ipforward_rt.ro_rt);
1248: ipforward_rt.ro_rt = 0;
1249: }
1250: sin->sin_family = AF_INET;
1251: sin->sin_len = sizeof(*sin);
1252: sin->sin_addr = dst;
1253:
1254: rtalloc(&ipforward_rt);
1255: }
1256: if (ipforward_rt.ro_rt == 0)
1257: return ((struct in_ifaddr *)0);
1.19 mycroft 1258: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1259: }
1260:
1261: /*
1262: * Save incoming source route for use in replies,
1263: * to be picked up later by ip_srcroute if the receiver is interested.
1264: */
1.13 mycroft 1265: void
1.1 cgd 1266: save_rte(option, dst)
1267: u_char *option;
1268: struct in_addr dst;
1269: {
1270: unsigned olen;
1271:
1272: olen = option[IPOPT_OLEN];
1273: #ifdef DIAGNOSTIC
1274: if (ipprintfs)
1.39 christos 1275: printf("save_rte: olen %d\n", olen);
1.89 itojun 1276: #endif /* 0 */
1.1 cgd 1277: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1278: return;
1279: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1280: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1281: ip_srcrt.dst = dst;
1282: }
1283:
1284: /*
1285: * Retrieve incoming source route for use in replies,
1286: * in the same form used by setsockopt.
1287: * The first hop is placed before the options, will be removed later.
1288: */
1289: struct mbuf *
1290: ip_srcroute()
1291: {
1.109 augustss 1292: struct in_addr *p, *q;
1293: struct mbuf *m;
1.1 cgd 1294:
1295: if (ip_nhops == 0)
1296: return ((struct mbuf *)0);
1297: m = m_get(M_DONTWAIT, MT_SOOPTS);
1298: if (m == 0)
1299: return ((struct mbuf *)0);
1300:
1.13 mycroft 1301: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1302:
1303: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1304: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1305: OPTSIZ;
1306: #ifdef DIAGNOSTIC
1307: if (ipprintfs)
1.39 christos 1308: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1309: #endif
1310:
1311: /*
1312: * First save first hop for return route
1313: */
1314: p = &ip_srcrt.route[ip_nhops - 1];
1315: *(mtod(m, struct in_addr *)) = *p--;
1316: #ifdef DIAGNOSTIC
1317: if (ipprintfs)
1.39 christos 1318: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1319: #endif
1320:
1321: /*
1322: * Copy option fields and padding (nop) to mbuf.
1323: */
1324: ip_srcrt.nop = IPOPT_NOP;
1325: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1326: bcopy((caddr_t)&ip_srcrt.nop,
1327: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1328: q = (struct in_addr *)(mtod(m, caddr_t) +
1329: sizeof(struct in_addr) + OPTSIZ);
1330: #undef OPTSIZ
1331: /*
1332: * Record return path as an IP source route,
1333: * reversing the path (pointers are now aligned).
1334: */
1335: while (p >= ip_srcrt.route) {
1336: #ifdef DIAGNOSTIC
1337: if (ipprintfs)
1.39 christos 1338: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1339: #endif
1340: *q++ = *p--;
1341: }
1342: /*
1343: * Last hop goes to final destination.
1344: */
1345: *q = ip_srcrt.dst;
1346: #ifdef DIAGNOSTIC
1347: if (ipprintfs)
1.39 christos 1348: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1349: #endif
1350: return (m);
1351: }
1352:
1353: /*
1354: * Strip out IP options, at higher
1355: * level protocol in the kernel.
1356: * Second argument is buffer to which options
1357: * will be moved, and return value is their length.
1358: * XXX should be deleted; last arg currently ignored.
1359: */
1.8 mycroft 1360: void
1.1 cgd 1361: ip_stripoptions(m, mopt)
1.109 augustss 1362: struct mbuf *m;
1.1 cgd 1363: struct mbuf *mopt;
1364: {
1.109 augustss 1365: int i;
1.1 cgd 1366: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1367: caddr_t opts;
1.1 cgd 1368: int olen;
1369:
1.79 mycroft 1370: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1371: opts = (caddr_t)(ip + 1);
1372: i = m->m_len - (sizeof (struct ip) + olen);
1373: bcopy(opts + olen, opts, (unsigned)i);
1374: m->m_len -= olen;
1375: if (m->m_flags & M_PKTHDR)
1376: m->m_pkthdr.len -= olen;
1.79 mycroft 1377: ip->ip_len -= olen;
1378: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1379: }
1380:
1.23 mycroft 1381: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1382: 0, 0, 0, 0,
1383: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1384: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1385: EMSGSIZE, EHOSTUNREACH, 0, 0,
1386: 0, 0, 0, 0,
1387: ENOPROTOOPT
1388: };
1389:
1390: /*
1391: * Forward a packet. If some error occurs return the sender
1392: * an icmp packet. Note we can't always generate a meaningful
1393: * icmp message because icmp doesn't have a large enough repertoire
1394: * of codes and types.
1395: *
1396: * If not forwarding, just drop the packet. This could be confusing
1397: * if ipforwarding was zero but some routing protocol was advancing
1398: * us as a gateway to somewhere. However, we must let the routing
1399: * protocol deal with that.
1400: *
1401: * The srcrt parameter indicates whether the packet is being forwarded
1402: * via a source route.
1403: */
1.13 mycroft 1404: void
1.1 cgd 1405: ip_forward(m, srcrt)
1406: struct mbuf *m;
1407: int srcrt;
1408: {
1.109 augustss 1409: struct ip *ip = mtod(m, struct ip *);
1410: struct sockaddr_in *sin;
1411: struct rtentry *rt;
1.28 christos 1412: int error, type = 0, code = 0;
1.1 cgd 1413: struct mbuf *mcopy;
1.13 mycroft 1414: n_long dest;
1415: struct ifnet *destifp;
1.89 itojun 1416: #ifdef IPSEC
1417: struct ifnet dummyifp;
1418: #endif
1.1 cgd 1419:
1.13 mycroft 1420: dest = 0;
1.1 cgd 1421: #ifdef DIAGNOSTIC
1422: if (ipprintfs)
1.70 thorpej 1423: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1424: ntohl(ip->ip_src.s_addr),
1425: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1426: #endif
1.93 sommerfe 1427: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1428: ipstat.ips_cantforward++;
1429: m_freem(m);
1430: return;
1431: }
1432: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1433: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1434: return;
1435: }
1436: ip->ip_ttl -= IPTTLDEC;
1437:
1.19 mycroft 1438: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1439: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1440: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1441: if (ipforward_rt.ro_rt) {
1442: RTFREE(ipforward_rt.ro_rt);
1443: ipforward_rt.ro_rt = 0;
1444: }
1445: sin->sin_family = AF_INET;
1.35 mycroft 1446: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1447: sin->sin_addr = ip->ip_dst;
1448:
1449: rtalloc(&ipforward_rt);
1450: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1451: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1452: return;
1453: }
1454: rt = ipforward_rt.ro_rt;
1455: }
1456:
1457: /*
1.34 mycroft 1458: * Save at most 68 bytes of the packet in case
1.1 cgd 1459: * we need to generate an ICMP message to the src.
1.114.4.3 tv 1460: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1461: */
1.114.4.3 tv 1462: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1463: if (mcopy)
1464: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1465:
1466: /*
1467: * If forwarding packet using same interface that it came in on,
1468: * perhaps should send a redirect to sender to shortcut a hop.
1469: * Only send redirect if source is sending directly to us,
1470: * and if packet was not source routed (or has any options).
1471: * Also, don't send redirect if forwarding using a default route
1472: * or a route modified by a redirect.
1473: */
1474: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1475: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1476: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1477: ipsendredirects && !srcrt) {
1.19 mycroft 1478: if (rt->rt_ifa &&
1479: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1480: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1481: if (rt->rt_flags & RTF_GATEWAY)
1482: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1483: else
1484: dest = ip->ip_dst.s_addr;
1485: /*
1486: * Router requirements says to only send host
1487: * redirects.
1488: */
1489: type = ICMP_REDIRECT;
1490: code = ICMP_REDIRECT_HOST;
1.1 cgd 1491: #ifdef DIAGNOSTIC
1.77 thorpej 1492: if (ipprintfs)
1493: printf("redirect (%d) to %x\n", code,
1494: (u_int32_t)dest);
1.1 cgd 1495: #endif
1496: }
1497: }
1498:
1.89 itojun 1499: #ifdef IPSEC
1.103 itojun 1500: /* Don't lookup socket in forwading case */
1.114.4.5 he 1501: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1502: #endif
1.27 thorpej 1503: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1504: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1505: if (error)
1506: ipstat.ips_cantforward++;
1507: else {
1508: ipstat.ips_forward++;
1509: if (type)
1510: ipstat.ips_redirectsent++;
1511: else {
1.63 matt 1512: if (mcopy) {
1513: #ifdef GATEWAY
1.64 thorpej 1514: if (mcopy->m_flags & M_CANFASTFWD)
1515: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1516: #endif
1.1 cgd 1517: m_freem(mcopy);
1.63 matt 1518: }
1.1 cgd 1519: return;
1520: }
1521: }
1522: if (mcopy == NULL)
1523: return;
1.13 mycroft 1524: destifp = NULL;
1525:
1.1 cgd 1526: switch (error) {
1527:
1528: case 0: /* forwarded, but need redirect */
1529: /* type, code set above */
1530: break;
1531:
1532: case ENETUNREACH: /* shouldn't happen, checked above */
1533: case EHOSTUNREACH:
1534: case ENETDOWN:
1535: case EHOSTDOWN:
1536: default:
1537: type = ICMP_UNREACH;
1538: code = ICMP_UNREACH_HOST;
1539: break;
1540:
1541: case EMSGSIZE:
1542: type = ICMP_UNREACH;
1543: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1544: #ifndef IPSEC
1.13 mycroft 1545: if (ipforward_rt.ro_rt)
1546: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1547: #else
1548: /*
1549: * If the packet is routed over IPsec tunnel, tell the
1550: * originator the tunnel MTU.
1551: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1552: * XXX quickhack!!!
1553: */
1554: if (ipforward_rt.ro_rt) {
1555: struct secpolicy *sp;
1556: int ipsecerror;
1.95 itojun 1557: size_t ipsechdr;
1.89 itojun 1558: struct route *ro;
1559:
1560: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1561: IPSEC_DIR_OUTBOUND,
1562: IP_FORWARDING,
1563: &ipsecerror);
1.89 itojun 1564:
1565: if (sp == NULL)
1566: destifp = ipforward_rt.ro_rt->rt_ifp;
1567: else {
1568: /* count IPsec header size */
1.95 itojun 1569: ipsechdr = ipsec4_hdrsiz(mcopy,
1570: IPSEC_DIR_OUTBOUND,
1571: NULL);
1.89 itojun 1572:
1573: /*
1574: * find the correct route for outer IPv4
1575: * header, compute tunnel MTU.
1576: *
1577: * XXX BUG ALERT
1578: * The "dummyifp" code relies upon the fact
1579: * that icmp_error() touches only ifp->if_mtu.
1580: */
1581: /*XXX*/
1582: destifp = NULL;
1583: if (sp->req != NULL
1.95 itojun 1584: && sp->req->sav != NULL
1585: && sp->req->sav->sah != NULL) {
1586: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1587: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1588: dummyifp.if_mtu =
1589: ro->ro_rt->rt_ifp->if_mtu;
1590: dummyifp.if_mtu -= ipsechdr;
1591: destifp = &dummyifp;
1592: }
1593: }
1594:
1595: key_freesp(sp);
1596: }
1597: }
1598: #endif /*IPSEC*/
1.1 cgd 1599: ipstat.ips_cantfrag++;
1600: break;
1601:
1602: case ENOBUFS:
1603: type = ICMP_SOURCEQUENCH;
1604: code = 0;
1605: break;
1606: }
1.13 mycroft 1607: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1608: }
1609:
1610: void
1611: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1612: struct inpcb *inp;
1613: struct mbuf **mp;
1614: struct ip *ip;
1615: struct mbuf *m;
1.44 thorpej 1616: {
1617:
1618: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1619: struct timeval tv;
1620:
1621: microtime(&tv);
1622: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1623: SCM_TIMESTAMP, SOL_SOCKET);
1624: if (*mp)
1625: mp = &(*mp)->m_next;
1626: }
1627: if (inp->inp_flags & INP_RECVDSTADDR) {
1628: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1629: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1630: if (*mp)
1631: mp = &(*mp)->m_next;
1632: }
1633: #ifdef notyet
1634: /*
1635: * XXX
1636: * Moving these out of udp_input() made them even more broken
1637: * than they already were.
1638: * - fenner@parc.xerox.com
1639: */
1640: /* options were tossed already */
1641: if (inp->inp_flags & INP_RECVOPTS) {
1642: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1643: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1644: if (*mp)
1645: mp = &(*mp)->m_next;
1646: }
1647: /* ip_srcroute doesn't do what we want here, need to fix */
1648: if (inp->inp_flags & INP_RECVRETOPTS) {
1649: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1650: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1651: if (*mp)
1652: mp = &(*mp)->m_next;
1653: }
1654: #endif
1655: if (inp->inp_flags & INP_RECVIF) {
1656: struct sockaddr_dl sdl;
1657:
1658: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1659: sdl.sdl_family = AF_LINK;
1660: sdl.sdl_index = m->m_pkthdr.rcvif ?
1661: m->m_pkthdr.rcvif->if_index : 0;
1662: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1663: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1664: IP_RECVIF, IPPROTO_IP);
1665: if (*mp)
1666: mp = &(*mp)->m_next;
1667: }
1.13 mycroft 1668: }
1669:
1670: int
1671: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1672: int *name;
1673: u_int namelen;
1674: void *oldp;
1675: size_t *oldlenp;
1676: void *newp;
1677: size_t newlen;
1678: {
1.88 sommerfe 1679: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1680:
1.54 lukem 1681: int error, old;
1682:
1.13 mycroft 1683: /* All sysctl names at this level are terminal. */
1684: if (namelen != 1)
1685: return (ENOTDIR);
1686:
1687: switch (name[0]) {
1688: case IPCTL_FORWARDING:
1689: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1690: case IPCTL_SENDREDIRECTS:
1691: return (sysctl_int(oldp, oldlenp, newp, newlen,
1692: &ipsendredirects));
1693: case IPCTL_DEFTTL:
1694: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1695: #ifdef notyet
1696: case IPCTL_DEFMTU:
1697: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1698: #endif
1.26 thorpej 1699: case IPCTL_FORWSRCRT:
1.47 cjs 1700: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1701: if (securelevel > 0)
1.46 cjs 1702: return (sysctl_rdint(oldp, oldlenp, newp,
1703: ip_forwsrcrt));
1704: else
1705: return (sysctl_int(oldp, oldlenp, newp, newlen,
1706: &ip_forwsrcrt));
1.27 thorpej 1707: case IPCTL_DIRECTEDBCAST:
1708: return (sysctl_int(oldp, oldlenp, newp, newlen,
1709: &ip_directedbcast));
1.47 cjs 1710: case IPCTL_ALLOWSRCRT:
1711: return (sysctl_int(oldp, oldlenp, newp, newlen,
1712: &ip_allowsrcrt));
1.52 thorpej 1713: case IPCTL_SUBNETSARELOCAL:
1714: return (sysctl_int(oldp, oldlenp, newp, newlen,
1715: &subnetsarelocal));
1.53 kml 1716: case IPCTL_MTUDISC:
1.60 kml 1717: error = sysctl_int(oldp, oldlenp, newp, newlen,
1718: &ip_mtudisc);
1719: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1720: ip_mtudisc_timeout_q =
1721: rt_timer_queue_create(ip_mtudisc_timeout);
1722: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1723: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1724: ip_mtudisc_timeout_q = NULL;
1725: }
1726: return error;
1.54 lukem 1727: case IPCTL_ANONPORTMIN:
1728: old = anonportmin;
1729: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.114.4.2 itojun 1730: if (anonportmin >= anonportmax || anonportmin < 0
1731: || anonportmin > 65535
1.54 lukem 1732: #ifndef IPNOPRIVPORTS
1733: || anonportmin < IPPORT_RESERVED
1734: #endif
1735: ) {
1736: anonportmin = old;
1737: return (EINVAL);
1738: }
1739: return (error);
1740: case IPCTL_ANONPORTMAX:
1741: old = anonportmax;
1742: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.114.4.2 itojun 1743: if (anonportmin >= anonportmax || anonportmax < 0
1744: || anonportmax > 65535
1.54 lukem 1745: #ifndef IPNOPRIVPORTS
1746: || anonportmax < IPPORT_RESERVED
1747: #endif
1748: ) {
1749: anonportmax = old;
1750: return (EINVAL);
1751: }
1.60 kml 1752: return (error);
1753: case IPCTL_MTUDISCTIMEOUT:
1754: error = sysctl_int(oldp, oldlenp, newp, newlen,
1755: &ip_mtudisc_timeout);
1756: if (ip_mtudisc_timeout_q != NULL)
1757: rt_timer_queue_change(ip_mtudisc_timeout_q,
1758: ip_mtudisc_timeout);
1.54 lukem 1759: return (error);
1.65 matt 1760: #ifdef GATEWAY
1761: case IPCTL_MAXFLOWS:
1.67 thorpej 1762: {
1763: int s;
1764:
1.65 matt 1765: error = sysctl_int(oldp, oldlenp, newp, newlen,
1766: &ip_maxflows);
1.67 thorpej 1767: s = splsoftnet();
1.65 matt 1768: ipflow_reap(0);
1.67 thorpej 1769: splx(s);
1.65 matt 1770: return (error);
1.67 thorpej 1771: }
1.89 itojun 1772: #endif
1.90 itojun 1773: case IPCTL_HOSTZEROBROADCAST:
1774: return (sysctl_int(oldp, oldlenp, newp, newlen,
1775: &hostzeroisbroadcast));
1.89 itojun 1776: #if NGIF > 0
1777: case IPCTL_GIF_TTL:
1778: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1779: &ip_gif_ttl));
1.114.4.7 he 1780: #endif
1781:
1782: #if NGRE > 0
1783: case IPCTL_GRE_TTL:
1784: return(sysctl_int(oldp, oldlenp, newp, newlen,
1785: &ip_gre_ttl));
1.114.4.1 tron 1786: #endif
1787:
1788: #ifndef IPNOPRIVPORTS
1789: case IPCTL_LOWPORTMIN:
1790: old = lowportmin;
1791: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1792: if (lowportmin >= lowportmax
1793: || lowportmin > IPPORT_RESERVEDMAX
1794: || lowportmin < IPPORT_RESERVEDMIN
1795: ) {
1796: lowportmin = old;
1797: return (EINVAL);
1798: }
1799: return (error);
1800: case IPCTL_LOWPORTMAX:
1801: old = lowportmax;
1802: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1803: if (lowportmin >= lowportmax
1804: || lowportmax > IPPORT_RESERVEDMAX
1805: || lowportmax < IPPORT_RESERVEDMIN
1806: ) {
1807: lowportmax = old;
1808: return (EINVAL);
1809: }
1810: return (error);
1.65 matt 1811: #endif
1.114.4.6 he 1812:
1813: case IPCTL_MAXFRAGPACKETS:
1814: return (sysctl_int(oldp, oldlenp, newp, newlen,
1815: &ip_maxfragpackets));
1.88 sommerfe 1816:
1.13 mycroft 1817: default:
1818: return (EOPNOTSUPP);
1819: }
1820: /* NOTREACHED */
1.1 cgd 1821: }
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