Annotation of src/sys/netinet/ip_input.c, Revision 1.114.4.7
1.114.4.7! he 1: /* $NetBSD: ip_input.c,v 1.114.4.6 2001/04/24 22:21:20 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: }
1.1 cgd 627: ip_forward(m, 0);
1.100 itojun 628: }
1.89 itojun 629: return;
1.1 cgd 630:
631: ours:
632: /*
633: * If offset or IP_MF are set, must reassemble.
634: * Otherwise, nothing need be done.
635: * (We could look in the reassembly queue to see
636: * if the packet was previously fragmented,
637: * but it's not worth the time; just let them time out.)
638: */
1.37 perry 639: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 640: /*
641: * Look for queue of fragments
642: * of this datagram.
643: */
1.75 thorpej 644: IPQ_LOCK();
1.25 cgd 645: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 646: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 647: in_hosteq(ip->ip_src, fp->ipq_src) &&
648: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 649: ip->ip_p == fp->ipq_p)
650: goto found;
651: fp = 0;
652: found:
653:
654: /*
655: * Adjust ip_len to not reflect header,
1.25 cgd 656: * set ipqe_mff if more fragments are expected,
1.1 cgd 657: * convert offset of this to bytes.
658: */
659: ip->ip_len -= hlen;
1.25 cgd 660: mff = (ip->ip_off & IP_MF) != 0;
661: if (mff) {
1.16 cgd 662: /*
663: * Make sure that fragments have a data length
664: * that's a non-zero multiple of 8 bytes.
665: */
1.17 cgd 666: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 667: ipstat.ips_badfrags++;
1.75 thorpej 668: IPQ_UNLOCK();
1.16 cgd 669: goto bad;
670: }
671: }
1.1 cgd 672: ip->ip_off <<= 3;
673:
674: /*
675: * If datagram marked as having more fragments
676: * or if this is not the first fragment,
677: * attempt reassembly; if it succeeds, proceed.
678: */
1.25 cgd 679: if (mff || ip->ip_off) {
1.1 cgd 680: ipstat.ips_fragments++;
1.72 thorpej 681: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 682: if (ipqe == NULL) {
683: ipstat.ips_rcvmemdrop++;
1.75 thorpej 684: IPQ_UNLOCK();
1.25 cgd 685: goto bad;
686: }
687: ipqe->ipqe_mff = mff;
1.50 thorpej 688: ipqe->ipqe_m = m;
1.25 cgd 689: ipqe->ipqe_ip = ip;
1.50 thorpej 690: m = ip_reass(ipqe, fp);
1.75 thorpej 691: if (m == 0) {
692: IPQ_UNLOCK();
1.89 itojun 693: return;
1.75 thorpej 694: }
1.13 mycroft 695: ipstat.ips_reassembled++;
1.50 thorpej 696: ip = mtod(m, struct ip *);
1.74 thorpej 697: hlen = ip->ip_hl << 2;
1.79 mycroft 698: ip->ip_len += hlen;
1.1 cgd 699: } else
700: if (fp)
701: ip_freef(fp);
1.75 thorpej 702: IPQ_UNLOCK();
1.79 mycroft 703: }
1.114.4.4 he 704:
705: #ifdef IPSEC
706: /*
707: * enforce IPsec policy checking if we are seeing last header.
708: * note that we do not visit this with protocols with pcb layer
709: * code - like udp/tcp/raw ip.
710: */
711: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
712: ipsec4_in_reject(m, NULL)) {
713: ipsecstat.in_polvio++;
714: goto bad;
715: }
716: #endif
1.1 cgd 717:
718: /*
719: * Switch out to protocol's input routine.
720: */
1.82 aidan 721: #if IFA_STATS
722: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
723: #endif
1.1 cgd 724: ipstat.ips_delivered++;
1.89 itojun 725: {
726: int off = hlen, nh = ip->ip_p;
727:
728: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
729: return;
730: }
1.1 cgd 731: bad:
732: m_freem(m);
733: }
734:
735: /*
736: * Take incoming datagram fragment and try to
737: * reassemble it into whole datagram. If a chain for
738: * reassembly of this datagram already exists, then it
739: * is given as fp; otherwise have to make a chain.
740: */
1.50 thorpej 741: struct mbuf *
1.25 cgd 742: ip_reass(ipqe, fp)
1.109 augustss 743: struct ipqent *ipqe;
744: struct ipq *fp;
1.1 cgd 745: {
1.109 augustss 746: struct mbuf *m = ipqe->ipqe_m;
747: struct ipqent *nq, *p, *q;
1.25 cgd 748: struct ip *ip;
1.1 cgd 749: struct mbuf *t;
1.25 cgd 750: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 751: int i, next;
752:
1.75 thorpej 753: IPQ_LOCK_CHECK();
754:
1.1 cgd 755: /*
756: * Presence of header sizes in mbufs
757: * would confuse code below.
758: */
759: m->m_data += hlen;
760: m->m_len -= hlen;
761:
762: /*
763: * If first fragment to arrive, create a reassembly queue.
764: */
765: if (fp == 0) {
1.114.4.6 he 766: /*
767: * Enforce upper bound on number of fragmented packets
768: * for which we attempt reassembly;
769: * If maxfrag is 0, never accept fragments.
770: * If maxfrag is -1, accept all fragments without limitation.
771: */
772: if (ip_maxfragpackets < 0)
773: ;
774: else if (ip_nfragpackets >= ip_maxfragpackets)
775: goto dropfrag;
776: ip_nfragpackets++;
1.50 thorpej 777: MALLOC(fp, struct ipq *, sizeof (struct ipq),
778: M_FTABLE, M_NOWAIT);
779: if (fp == NULL)
1.1 cgd 780: goto dropfrag;
1.25 cgd 781: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 782: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 783: fp->ipq_p = ipqe->ipqe_ip->ip_p;
784: fp->ipq_id = ipqe->ipqe_ip->ip_id;
785: LIST_INIT(&fp->ipq_fragq);
786: fp->ipq_src = ipqe->ipqe_ip->ip_src;
787: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
788: p = NULL;
1.1 cgd 789: goto insert;
790: }
791:
792: /*
793: * Find a segment which begins after this one does.
794: */
1.25 cgd 795: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
796: p = q, q = q->ipqe_q.le_next)
797: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 798: break;
799:
800: /*
801: * If there is a preceding segment, it may provide some of
802: * our data already. If so, drop the data from the incoming
803: * segment. If it provides all of our data, drop us.
804: */
1.25 cgd 805: if (p != NULL) {
806: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
807: ipqe->ipqe_ip->ip_off;
1.1 cgd 808: if (i > 0) {
1.25 cgd 809: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 810: goto dropfrag;
1.50 thorpej 811: m_adj(ipqe->ipqe_m, i);
1.25 cgd 812: ipqe->ipqe_ip->ip_off += i;
813: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 814: }
815: }
816:
817: /*
818: * While we overlap succeeding segments trim them or,
819: * if they are completely covered, dequeue them.
820: */
1.25 cgd 821: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
822: q->ipqe_ip->ip_off; q = nq) {
823: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
824: q->ipqe_ip->ip_off;
825: if (i < q->ipqe_ip->ip_len) {
826: q->ipqe_ip->ip_len -= i;
827: q->ipqe_ip->ip_off += i;
1.50 thorpej 828: m_adj(q->ipqe_m, i);
1.1 cgd 829: break;
830: }
1.25 cgd 831: nq = q->ipqe_q.le_next;
1.50 thorpej 832: m_freem(q->ipqe_m);
1.25 cgd 833: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 834: pool_put(&ipqent_pool, q);
1.1 cgd 835: }
836:
837: insert:
838: /*
839: * Stick new segment in its place;
840: * check for complete reassembly.
841: */
1.25 cgd 842: if (p == NULL) {
843: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
844: } else {
845: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
846: }
1.1 cgd 847: next = 0;
1.25 cgd 848: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
849: p = q, q = q->ipqe_q.le_next) {
850: if (q->ipqe_ip->ip_off != next)
1.1 cgd 851: return (0);
1.25 cgd 852: next += q->ipqe_ip->ip_len;
1.1 cgd 853: }
1.25 cgd 854: if (p->ipqe_mff)
1.1 cgd 855: return (0);
856:
857: /*
1.41 thorpej 858: * Reassembly is complete. Check for a bogus message size and
859: * concatenate fragments.
1.1 cgd 860: */
1.25 cgd 861: q = fp->ipq_fragq.lh_first;
862: ip = q->ipqe_ip;
1.41 thorpej 863: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
864: ipstat.ips_toolong++;
865: ip_freef(fp);
866: return (0);
867: }
1.50 thorpej 868: m = q->ipqe_m;
1.1 cgd 869: t = m->m_next;
870: m->m_next = 0;
871: m_cat(m, t);
1.25 cgd 872: nq = q->ipqe_q.le_next;
1.72 thorpej 873: pool_put(&ipqent_pool, q);
1.25 cgd 874: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 875: t = q->ipqe_m;
1.25 cgd 876: nq = q->ipqe_q.le_next;
1.72 thorpej 877: pool_put(&ipqent_pool, q);
1.1 cgd 878: m_cat(m, t);
879: }
880:
881: /*
882: * Create header for new ip packet by
883: * modifying header of first packet;
884: * dequeue and discard fragment reassembly header.
885: * Make header visible.
886: */
887: ip->ip_len = next;
1.25 cgd 888: ip->ip_src = fp->ipq_src;
889: ip->ip_dst = fp->ipq_dst;
890: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 891: FREE(fp, M_FTABLE);
1.114.4.6 he 892: ip_nfragpackets--;
1.1 cgd 893: m->m_len += (ip->ip_hl << 2);
894: m->m_data -= (ip->ip_hl << 2);
895: /* some debugging cruft by sklower, below, will go away soon */
896: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 897: int plen = 0;
1.50 thorpej 898: for (t = m; t; t = t->m_next)
899: plen += t->m_len;
900: m->m_pkthdr.len = plen;
1.1 cgd 901: }
1.50 thorpej 902: return (m);
1.1 cgd 903:
904: dropfrag:
905: ipstat.ips_fragdropped++;
906: m_freem(m);
1.72 thorpej 907: pool_put(&ipqent_pool, ipqe);
1.1 cgd 908: return (0);
909: }
910:
911: /*
912: * Free a fragment reassembly header and all
913: * associated datagrams.
914: */
1.8 mycroft 915: void
1.1 cgd 916: ip_freef(fp)
917: struct ipq *fp;
918: {
1.109 augustss 919: struct ipqent *q, *p;
1.1 cgd 920:
1.75 thorpej 921: IPQ_LOCK_CHECK();
922:
1.25 cgd 923: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
924: p = q->ipqe_q.le_next;
1.50 thorpej 925: m_freem(q->ipqe_m);
1.25 cgd 926: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 927: pool_put(&ipqent_pool, q);
1.1 cgd 928: }
1.25 cgd 929: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 930: FREE(fp, M_FTABLE);
1.114.4.6 he 931: ip_nfragpackets--;
1.1 cgd 932: }
933:
934: /*
935: * IP timer processing;
936: * if a timer expires on a reassembly
937: * queue, discard it.
938: */
1.8 mycroft 939: void
1.1 cgd 940: ip_slowtimo()
941: {
1.109 augustss 942: struct ipq *fp, *nfp;
1.24 mycroft 943: int s = splsoftnet();
1.1 cgd 944:
1.75 thorpej 945: IPQ_LOCK();
1.25 cgd 946: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
947: nfp = fp->ipq_q.le_next;
948: if (--fp->ipq_ttl == 0) {
1.1 cgd 949: ipstat.ips_fragtimeout++;
1.25 cgd 950: ip_freef(fp);
1.1 cgd 951: }
952: }
1.114.4.6 he 953: /*
954: * If we are over the maximum number of fragments
955: * (due to the limit being lowered), drain off
956: * enough to get down to the new limit.
957: */
958: if (ip_maxfragpackets < 0)
959: ;
960: else {
961: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
962: ip_freef(ipq.lh_first);
963: }
1.75 thorpej 964: IPQ_UNLOCK();
1.63 matt 965: #ifdef GATEWAY
966: ipflow_slowtimo();
967: #endif
1.1 cgd 968: splx(s);
969: }
970:
971: /*
972: * Drain off all datagram fragments.
973: */
1.8 mycroft 974: void
1.1 cgd 975: ip_drain()
976: {
977:
1.75 thorpej 978: /*
979: * We may be called from a device's interrupt context. If
980: * the ipq is already busy, just bail out now.
981: */
982: if (ipq_lock_try() == 0)
983: return;
984:
1.25 cgd 985: while (ipq.lh_first != NULL) {
1.1 cgd 986: ipstat.ips_fragdropped++;
1.25 cgd 987: ip_freef(ipq.lh_first);
1.1 cgd 988: }
1.75 thorpej 989:
990: IPQ_UNLOCK();
1.1 cgd 991: }
992:
993: /*
994: * Do option processing on a datagram,
995: * possibly discarding it if bad options are encountered,
996: * or forwarding it if source-routed.
997: * Returns 1 if packet has been forwarded/freed,
998: * 0 if the packet should be processed further.
999: */
1.8 mycroft 1000: int
1.1 cgd 1001: ip_dooptions(m)
1002: struct mbuf *m;
1003: {
1.109 augustss 1004: struct ip *ip = mtod(m, struct ip *);
1005: u_char *cp, *cp0;
1006: struct ip_timestamp *ipt;
1007: struct in_ifaddr *ia;
1.1 cgd 1008: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1009: struct in_addr dst;
1.1 cgd 1010: n_time ntime;
1011:
1.13 mycroft 1012: dst = ip->ip_dst;
1.1 cgd 1013: cp = (u_char *)(ip + 1);
1014: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1015: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1016: opt = cp[IPOPT_OPTVAL];
1017: if (opt == IPOPT_EOL)
1018: break;
1019: if (opt == IPOPT_NOP)
1020: optlen = 1;
1021: else {
1.113 itojun 1022: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1023: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1024: goto bad;
1025: }
1.1 cgd 1026: optlen = cp[IPOPT_OLEN];
1.114 itojun 1027: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1028: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1029: goto bad;
1030: }
1031: }
1032: switch (opt) {
1033:
1034: default:
1035: break;
1036:
1037: /*
1038: * Source routing with record.
1039: * Find interface with current destination address.
1040: * If none on this machine then drop if strictly routed,
1041: * or do nothing if loosely routed.
1042: * Record interface address and bring up next address
1043: * component. If strictly routed make sure next
1044: * address is on directly accessible net.
1045: */
1046: case IPOPT_LSRR:
1047: case IPOPT_SSRR:
1.47 cjs 1048: if (ip_allowsrcrt == 0) {
1049: type = ICMP_UNREACH;
1050: code = ICMP_UNREACH_NET_PROHIB;
1051: goto bad;
1052: }
1.114 itojun 1053: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1054: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1055: goto bad;
1056: }
1.1 cgd 1057: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1058: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1059: goto bad;
1060: }
1061: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1062: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1063: if (ia == 0) {
1064: if (opt == IPOPT_SSRR) {
1065: type = ICMP_UNREACH;
1066: code = ICMP_UNREACH_SRCFAIL;
1067: goto bad;
1068: }
1069: /*
1070: * Loose routing, and not at next destination
1071: * yet; nothing to do except forward.
1072: */
1073: break;
1074: }
1075: off--; /* 0 origin */
1.112 sommerfe 1076: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1077: /*
1078: * End of source route. Should be for us.
1079: */
1080: save_rte(cp, ip->ip_src);
1081: break;
1082: }
1083: /*
1084: * locate outgoing interface
1085: */
1086: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1087: sizeof(ipaddr.sin_addr));
1.96 thorpej 1088: if (opt == IPOPT_SSRR)
1089: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1090: else
1.1 cgd 1091: ia = ip_rtaddr(ipaddr.sin_addr);
1092: if (ia == 0) {
1093: type = ICMP_UNREACH;
1094: code = ICMP_UNREACH_SRCFAIL;
1095: goto bad;
1096: }
1097: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1098: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1099: (caddr_t)(cp + off), sizeof(struct in_addr));
1100: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1101: /*
1102: * Let ip_intr's mcast routing check handle mcast pkts
1103: */
1.18 mycroft 1104: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1105: break;
1106:
1107: case IPOPT_RR:
1.114 itojun 1108: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1109: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1110: goto bad;
1111: }
1.1 cgd 1112: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1113: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1114: goto bad;
1115: }
1116: /*
1117: * If no space remains, ignore.
1118: */
1119: off--; /* 0 origin */
1.112 sommerfe 1120: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1121: break;
1122: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1123: sizeof(ipaddr.sin_addr));
1124: /*
1125: * locate outgoing interface; if we're the destination,
1126: * use the incoming interface (should be same).
1127: */
1.96 thorpej 1128: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1129: == NULL &&
1130: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1131: type = ICMP_UNREACH;
1132: code = ICMP_UNREACH_HOST;
1133: goto bad;
1134: }
1.20 mycroft 1135: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1136: (caddr_t)(cp + off), sizeof(struct in_addr));
1137: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1138: break;
1139:
1140: case IPOPT_TS:
1141: code = cp - (u_char *)ip;
1142: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1143: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1144: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1145: goto bad;
1.114 itojun 1146: }
1147: if (ipt->ipt_ptr < 5) {
1148: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1149: goto bad;
1150: }
1.15 cgd 1151: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1152: if (++ipt->ipt_oflw == 0) {
1153: code = (u_char *)&ipt->ipt_ptr -
1154: (u_char *)ip;
1.1 cgd 1155: goto bad;
1.114 itojun 1156: }
1.1 cgd 1157: break;
1158: }
1.104 thorpej 1159: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1160: switch (ipt->ipt_flg) {
1161:
1162: case IPOPT_TS_TSONLY:
1163: break;
1164:
1165: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1166: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1167: sizeof(struct in_addr) > ipt->ipt_len) {
1168: code = (u_char *)&ipt->ipt_ptr -
1169: (u_char *)ip;
1.1 cgd 1170: goto bad;
1.114 itojun 1171: }
1.13 mycroft 1172: ipaddr.sin_addr = dst;
1.96 thorpej 1173: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1174: m->m_pkthdr.rcvif));
1.13 mycroft 1175: if (ia == 0)
1176: continue;
1.104 thorpej 1177: bcopy(&ia->ia_addr.sin_addr,
1178: cp0, sizeof(struct in_addr));
1.1 cgd 1179: ipt->ipt_ptr += sizeof(struct in_addr);
1180: break;
1181:
1182: case IPOPT_TS_PRESPEC:
1.66 thorpej 1183: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1184: sizeof(struct in_addr) > ipt->ipt_len) {
1185: code = (u_char *)&ipt->ipt_ptr -
1186: (u_char *)ip;
1.1 cgd 1187: goto bad;
1.114 itojun 1188: }
1.104 thorpej 1189: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1190: sizeof(struct in_addr));
1.96 thorpej 1191: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1192: == NULL)
1.1 cgd 1193: continue;
1194: ipt->ipt_ptr += sizeof(struct in_addr);
1195: break;
1196:
1197: default:
1.114 itojun 1198: /* XXX can't take &ipt->ipt_flg */
1199: code = (u_char *)&ipt->ipt_ptr -
1200: (u_char *)ip + 1;
1.1 cgd 1201: goto bad;
1202: }
1203: ntime = iptime();
1.107 thorpej 1204: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1205: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1206: sizeof(n_time));
1207: ipt->ipt_ptr += sizeof(n_time);
1208: }
1209: }
1210: if (forward) {
1.26 thorpej 1211: if (ip_forwsrcrt == 0) {
1212: type = ICMP_UNREACH;
1213: code = ICMP_UNREACH_SRCFAIL;
1214: goto bad;
1215: }
1.1 cgd 1216: ip_forward(m, 1);
1217: return (1);
1.13 mycroft 1218: }
1219: return (0);
1.1 cgd 1220: bad:
1.13 mycroft 1221: icmp_error(m, type, code, 0, 0);
1222: ipstat.ips_badoptions++;
1.1 cgd 1223: return (1);
1224: }
1225:
1226: /*
1227: * Given address of next destination (final or next hop),
1228: * return internet address info of interface to be used to get there.
1229: */
1230: struct in_ifaddr *
1231: ip_rtaddr(dst)
1232: struct in_addr dst;
1233: {
1.109 augustss 1234: struct sockaddr_in *sin;
1.1 cgd 1235:
1.19 mycroft 1236: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1237:
1.35 mycroft 1238: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1239: if (ipforward_rt.ro_rt) {
1240: RTFREE(ipforward_rt.ro_rt);
1241: ipforward_rt.ro_rt = 0;
1242: }
1243: sin->sin_family = AF_INET;
1244: sin->sin_len = sizeof(*sin);
1245: sin->sin_addr = dst;
1246:
1247: rtalloc(&ipforward_rt);
1248: }
1249: if (ipforward_rt.ro_rt == 0)
1250: return ((struct in_ifaddr *)0);
1.19 mycroft 1251: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1252: }
1253:
1254: /*
1255: * Save incoming source route for use in replies,
1256: * to be picked up later by ip_srcroute if the receiver is interested.
1257: */
1.13 mycroft 1258: void
1.1 cgd 1259: save_rte(option, dst)
1260: u_char *option;
1261: struct in_addr dst;
1262: {
1263: unsigned olen;
1264:
1265: olen = option[IPOPT_OLEN];
1266: #ifdef DIAGNOSTIC
1267: if (ipprintfs)
1.39 christos 1268: printf("save_rte: olen %d\n", olen);
1.89 itojun 1269: #endif /* 0 */
1.1 cgd 1270: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1271: return;
1272: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1273: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1274: ip_srcrt.dst = dst;
1275: }
1276:
1277: /*
1278: * Retrieve incoming source route for use in replies,
1279: * in the same form used by setsockopt.
1280: * The first hop is placed before the options, will be removed later.
1281: */
1282: struct mbuf *
1283: ip_srcroute()
1284: {
1.109 augustss 1285: struct in_addr *p, *q;
1286: struct mbuf *m;
1.1 cgd 1287:
1288: if (ip_nhops == 0)
1289: return ((struct mbuf *)0);
1290: m = m_get(M_DONTWAIT, MT_SOOPTS);
1291: if (m == 0)
1292: return ((struct mbuf *)0);
1293:
1.13 mycroft 1294: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1295:
1296: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1297: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1298: OPTSIZ;
1299: #ifdef DIAGNOSTIC
1300: if (ipprintfs)
1.39 christos 1301: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1302: #endif
1303:
1304: /*
1305: * First save first hop for return route
1306: */
1307: p = &ip_srcrt.route[ip_nhops - 1];
1308: *(mtod(m, struct in_addr *)) = *p--;
1309: #ifdef DIAGNOSTIC
1310: if (ipprintfs)
1.39 christos 1311: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1312: #endif
1313:
1314: /*
1315: * Copy option fields and padding (nop) to mbuf.
1316: */
1317: ip_srcrt.nop = IPOPT_NOP;
1318: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1319: bcopy((caddr_t)&ip_srcrt.nop,
1320: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1321: q = (struct in_addr *)(mtod(m, caddr_t) +
1322: sizeof(struct in_addr) + OPTSIZ);
1323: #undef OPTSIZ
1324: /*
1325: * Record return path as an IP source route,
1326: * reversing the path (pointers are now aligned).
1327: */
1328: while (p >= ip_srcrt.route) {
1329: #ifdef DIAGNOSTIC
1330: if (ipprintfs)
1.39 christos 1331: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1332: #endif
1333: *q++ = *p--;
1334: }
1335: /*
1336: * Last hop goes to final destination.
1337: */
1338: *q = ip_srcrt.dst;
1339: #ifdef DIAGNOSTIC
1340: if (ipprintfs)
1.39 christos 1341: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1342: #endif
1343: return (m);
1344: }
1345:
1346: /*
1347: * Strip out IP options, at higher
1348: * level protocol in the kernel.
1349: * Second argument is buffer to which options
1350: * will be moved, and return value is their length.
1351: * XXX should be deleted; last arg currently ignored.
1352: */
1.8 mycroft 1353: void
1.1 cgd 1354: ip_stripoptions(m, mopt)
1.109 augustss 1355: struct mbuf *m;
1.1 cgd 1356: struct mbuf *mopt;
1357: {
1.109 augustss 1358: int i;
1.1 cgd 1359: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1360: caddr_t opts;
1.1 cgd 1361: int olen;
1362:
1.79 mycroft 1363: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1364: opts = (caddr_t)(ip + 1);
1365: i = m->m_len - (sizeof (struct ip) + olen);
1366: bcopy(opts + olen, opts, (unsigned)i);
1367: m->m_len -= olen;
1368: if (m->m_flags & M_PKTHDR)
1369: m->m_pkthdr.len -= olen;
1.79 mycroft 1370: ip->ip_len -= olen;
1371: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1372: }
1373:
1.23 mycroft 1374: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1375: 0, 0, 0, 0,
1376: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1377: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1378: EMSGSIZE, EHOSTUNREACH, 0, 0,
1379: 0, 0, 0, 0,
1380: ENOPROTOOPT
1381: };
1382:
1383: /*
1384: * Forward a packet. If some error occurs return the sender
1385: * an icmp packet. Note we can't always generate a meaningful
1386: * icmp message because icmp doesn't have a large enough repertoire
1387: * of codes and types.
1388: *
1389: * If not forwarding, just drop the packet. This could be confusing
1390: * if ipforwarding was zero but some routing protocol was advancing
1391: * us as a gateway to somewhere. However, we must let the routing
1392: * protocol deal with that.
1393: *
1394: * The srcrt parameter indicates whether the packet is being forwarded
1395: * via a source route.
1396: */
1.13 mycroft 1397: void
1.1 cgd 1398: ip_forward(m, srcrt)
1399: struct mbuf *m;
1400: int srcrt;
1401: {
1.109 augustss 1402: struct ip *ip = mtod(m, struct ip *);
1403: struct sockaddr_in *sin;
1404: struct rtentry *rt;
1.28 christos 1405: int error, type = 0, code = 0;
1.1 cgd 1406: struct mbuf *mcopy;
1.13 mycroft 1407: n_long dest;
1408: struct ifnet *destifp;
1.89 itojun 1409: #ifdef IPSEC
1410: struct ifnet dummyifp;
1411: #endif
1.1 cgd 1412:
1.13 mycroft 1413: dest = 0;
1.1 cgd 1414: #ifdef DIAGNOSTIC
1415: if (ipprintfs)
1.70 thorpej 1416: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1417: ntohl(ip->ip_src.s_addr),
1418: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1419: #endif
1.93 sommerfe 1420: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1421: ipstat.ips_cantforward++;
1422: m_freem(m);
1423: return;
1424: }
1425: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1426: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1427: return;
1428: }
1429: ip->ip_ttl -= IPTTLDEC;
1430:
1.19 mycroft 1431: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1432: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1433: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1434: if (ipforward_rt.ro_rt) {
1435: RTFREE(ipforward_rt.ro_rt);
1436: ipforward_rt.ro_rt = 0;
1437: }
1438: sin->sin_family = AF_INET;
1.35 mycroft 1439: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1440: sin->sin_addr = ip->ip_dst;
1441:
1442: rtalloc(&ipforward_rt);
1443: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1444: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1445: return;
1446: }
1447: rt = ipforward_rt.ro_rt;
1448: }
1449:
1450: /*
1.34 mycroft 1451: * Save at most 68 bytes of the packet in case
1.1 cgd 1452: * we need to generate an ICMP message to the src.
1.114.4.3 tv 1453: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1454: */
1.114.4.3 tv 1455: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1456: if (mcopy)
1457: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1458:
1459: /*
1460: * If forwarding packet using same interface that it came in on,
1461: * perhaps should send a redirect to sender to shortcut a hop.
1462: * Only send redirect if source is sending directly to us,
1463: * and if packet was not source routed (or has any options).
1464: * Also, don't send redirect if forwarding using a default route
1465: * or a route modified by a redirect.
1466: */
1467: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1468: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1469: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1470: ipsendredirects && !srcrt) {
1.19 mycroft 1471: if (rt->rt_ifa &&
1472: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1473: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1474: if (rt->rt_flags & RTF_GATEWAY)
1475: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1476: else
1477: dest = ip->ip_dst.s_addr;
1478: /*
1479: * Router requirements says to only send host
1480: * redirects.
1481: */
1482: type = ICMP_REDIRECT;
1483: code = ICMP_REDIRECT_HOST;
1.1 cgd 1484: #ifdef DIAGNOSTIC
1.77 thorpej 1485: if (ipprintfs)
1486: printf("redirect (%d) to %x\n", code,
1487: (u_int32_t)dest);
1.1 cgd 1488: #endif
1489: }
1490: }
1491:
1.89 itojun 1492: #ifdef IPSEC
1.103 itojun 1493: /* Don't lookup socket in forwading case */
1.114.4.5 he 1494: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1495: #endif
1.27 thorpej 1496: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1497: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1498: if (error)
1499: ipstat.ips_cantforward++;
1500: else {
1501: ipstat.ips_forward++;
1502: if (type)
1503: ipstat.ips_redirectsent++;
1504: else {
1.63 matt 1505: if (mcopy) {
1506: #ifdef GATEWAY
1.64 thorpej 1507: if (mcopy->m_flags & M_CANFASTFWD)
1508: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1509: #endif
1.1 cgd 1510: m_freem(mcopy);
1.63 matt 1511: }
1.1 cgd 1512: return;
1513: }
1514: }
1515: if (mcopy == NULL)
1516: return;
1.13 mycroft 1517: destifp = NULL;
1518:
1.1 cgd 1519: switch (error) {
1520:
1521: case 0: /* forwarded, but need redirect */
1522: /* type, code set above */
1523: break;
1524:
1525: case ENETUNREACH: /* shouldn't happen, checked above */
1526: case EHOSTUNREACH:
1527: case ENETDOWN:
1528: case EHOSTDOWN:
1529: default:
1530: type = ICMP_UNREACH;
1531: code = ICMP_UNREACH_HOST;
1532: break;
1533:
1534: case EMSGSIZE:
1535: type = ICMP_UNREACH;
1536: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1537: #ifndef IPSEC
1.13 mycroft 1538: if (ipforward_rt.ro_rt)
1539: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1540: #else
1541: /*
1542: * If the packet is routed over IPsec tunnel, tell the
1543: * originator the tunnel MTU.
1544: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1545: * XXX quickhack!!!
1546: */
1547: if (ipforward_rt.ro_rt) {
1548: struct secpolicy *sp;
1549: int ipsecerror;
1.95 itojun 1550: size_t ipsechdr;
1.89 itojun 1551: struct route *ro;
1552:
1553: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1554: IPSEC_DIR_OUTBOUND,
1555: IP_FORWARDING,
1556: &ipsecerror);
1.89 itojun 1557:
1558: if (sp == NULL)
1559: destifp = ipforward_rt.ro_rt->rt_ifp;
1560: else {
1561: /* count IPsec header size */
1.95 itojun 1562: ipsechdr = ipsec4_hdrsiz(mcopy,
1563: IPSEC_DIR_OUTBOUND,
1564: NULL);
1.89 itojun 1565:
1566: /*
1567: * find the correct route for outer IPv4
1568: * header, compute tunnel MTU.
1569: *
1570: * XXX BUG ALERT
1571: * The "dummyifp" code relies upon the fact
1572: * that icmp_error() touches only ifp->if_mtu.
1573: */
1574: /*XXX*/
1575: destifp = NULL;
1576: if (sp->req != NULL
1.95 itojun 1577: && sp->req->sav != NULL
1578: && sp->req->sav->sah != NULL) {
1579: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1580: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1581: dummyifp.if_mtu =
1582: ro->ro_rt->rt_ifp->if_mtu;
1583: dummyifp.if_mtu -= ipsechdr;
1584: destifp = &dummyifp;
1585: }
1586: }
1587:
1588: key_freesp(sp);
1589: }
1590: }
1591: #endif /*IPSEC*/
1.1 cgd 1592: ipstat.ips_cantfrag++;
1593: break;
1594:
1595: case ENOBUFS:
1596: type = ICMP_SOURCEQUENCH;
1597: code = 0;
1598: break;
1599: }
1.13 mycroft 1600: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1601: }
1602:
1603: void
1604: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1605: struct inpcb *inp;
1606: struct mbuf **mp;
1607: struct ip *ip;
1608: struct mbuf *m;
1.44 thorpej 1609: {
1610:
1611: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1612: struct timeval tv;
1613:
1614: microtime(&tv);
1615: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1616: SCM_TIMESTAMP, SOL_SOCKET);
1617: if (*mp)
1618: mp = &(*mp)->m_next;
1619: }
1620: if (inp->inp_flags & INP_RECVDSTADDR) {
1621: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1622: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1623: if (*mp)
1624: mp = &(*mp)->m_next;
1625: }
1626: #ifdef notyet
1627: /*
1628: * XXX
1629: * Moving these out of udp_input() made them even more broken
1630: * than they already were.
1631: * - fenner@parc.xerox.com
1632: */
1633: /* options were tossed already */
1634: if (inp->inp_flags & INP_RECVOPTS) {
1635: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1636: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1637: if (*mp)
1638: mp = &(*mp)->m_next;
1639: }
1640: /* ip_srcroute doesn't do what we want here, need to fix */
1641: if (inp->inp_flags & INP_RECVRETOPTS) {
1642: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1643: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1644: if (*mp)
1645: mp = &(*mp)->m_next;
1646: }
1647: #endif
1648: if (inp->inp_flags & INP_RECVIF) {
1649: struct sockaddr_dl sdl;
1650:
1651: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1652: sdl.sdl_family = AF_LINK;
1653: sdl.sdl_index = m->m_pkthdr.rcvif ?
1654: m->m_pkthdr.rcvif->if_index : 0;
1655: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1656: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1657: IP_RECVIF, IPPROTO_IP);
1658: if (*mp)
1659: mp = &(*mp)->m_next;
1660: }
1.13 mycroft 1661: }
1662:
1663: int
1664: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1665: int *name;
1666: u_int namelen;
1667: void *oldp;
1668: size_t *oldlenp;
1669: void *newp;
1670: size_t newlen;
1671: {
1.88 sommerfe 1672: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1673:
1.54 lukem 1674: int error, old;
1675:
1.13 mycroft 1676: /* All sysctl names at this level are terminal. */
1677: if (namelen != 1)
1678: return (ENOTDIR);
1679:
1680: switch (name[0]) {
1681: case IPCTL_FORWARDING:
1682: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1683: case IPCTL_SENDREDIRECTS:
1684: return (sysctl_int(oldp, oldlenp, newp, newlen,
1685: &ipsendredirects));
1686: case IPCTL_DEFTTL:
1687: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1688: #ifdef notyet
1689: case IPCTL_DEFMTU:
1690: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1691: #endif
1.26 thorpej 1692: case IPCTL_FORWSRCRT:
1.47 cjs 1693: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1694: if (securelevel > 0)
1.46 cjs 1695: return (sysctl_rdint(oldp, oldlenp, newp,
1696: ip_forwsrcrt));
1697: else
1698: return (sysctl_int(oldp, oldlenp, newp, newlen,
1699: &ip_forwsrcrt));
1.27 thorpej 1700: case IPCTL_DIRECTEDBCAST:
1701: return (sysctl_int(oldp, oldlenp, newp, newlen,
1702: &ip_directedbcast));
1.47 cjs 1703: case IPCTL_ALLOWSRCRT:
1704: return (sysctl_int(oldp, oldlenp, newp, newlen,
1705: &ip_allowsrcrt));
1.52 thorpej 1706: case IPCTL_SUBNETSARELOCAL:
1707: return (sysctl_int(oldp, oldlenp, newp, newlen,
1708: &subnetsarelocal));
1.53 kml 1709: case IPCTL_MTUDISC:
1.60 kml 1710: error = sysctl_int(oldp, oldlenp, newp, newlen,
1711: &ip_mtudisc);
1712: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1713: ip_mtudisc_timeout_q =
1714: rt_timer_queue_create(ip_mtudisc_timeout);
1715: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1716: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1717: ip_mtudisc_timeout_q = NULL;
1718: }
1719: return error;
1.54 lukem 1720: case IPCTL_ANONPORTMIN:
1721: old = anonportmin;
1722: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.114.4.2 itojun 1723: if (anonportmin >= anonportmax || anonportmin < 0
1724: || anonportmin > 65535
1.54 lukem 1725: #ifndef IPNOPRIVPORTS
1726: || anonportmin < IPPORT_RESERVED
1727: #endif
1728: ) {
1729: anonportmin = old;
1730: return (EINVAL);
1731: }
1732: return (error);
1733: case IPCTL_ANONPORTMAX:
1734: old = anonportmax;
1735: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.114.4.2 itojun 1736: if (anonportmin >= anonportmax || anonportmax < 0
1737: || anonportmax > 65535
1.54 lukem 1738: #ifndef IPNOPRIVPORTS
1739: || anonportmax < IPPORT_RESERVED
1740: #endif
1741: ) {
1742: anonportmax = old;
1743: return (EINVAL);
1744: }
1.60 kml 1745: return (error);
1746: case IPCTL_MTUDISCTIMEOUT:
1747: error = sysctl_int(oldp, oldlenp, newp, newlen,
1748: &ip_mtudisc_timeout);
1749: if (ip_mtudisc_timeout_q != NULL)
1750: rt_timer_queue_change(ip_mtudisc_timeout_q,
1751: ip_mtudisc_timeout);
1.54 lukem 1752: return (error);
1.65 matt 1753: #ifdef GATEWAY
1754: case IPCTL_MAXFLOWS:
1.67 thorpej 1755: {
1756: int s;
1757:
1.65 matt 1758: error = sysctl_int(oldp, oldlenp, newp, newlen,
1759: &ip_maxflows);
1.67 thorpej 1760: s = splsoftnet();
1.65 matt 1761: ipflow_reap(0);
1.67 thorpej 1762: splx(s);
1.65 matt 1763: return (error);
1.67 thorpej 1764: }
1.89 itojun 1765: #endif
1.90 itojun 1766: case IPCTL_HOSTZEROBROADCAST:
1767: return (sysctl_int(oldp, oldlenp, newp, newlen,
1768: &hostzeroisbroadcast));
1.89 itojun 1769: #if NGIF > 0
1770: case IPCTL_GIF_TTL:
1771: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1772: &ip_gif_ttl));
1.114.4.7! he 1773: #endif
! 1774:
! 1775: #if NGRE > 0
! 1776: case IPCTL_GRE_TTL:
! 1777: return(sysctl_int(oldp, oldlenp, newp, newlen,
! 1778: &ip_gre_ttl));
1.114.4.1 tron 1779: #endif
1780:
1781: #ifndef IPNOPRIVPORTS
1782: case IPCTL_LOWPORTMIN:
1783: old = lowportmin;
1784: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1785: if (lowportmin >= lowportmax
1786: || lowportmin > IPPORT_RESERVEDMAX
1787: || lowportmin < IPPORT_RESERVEDMIN
1788: ) {
1789: lowportmin = old;
1790: return (EINVAL);
1791: }
1792: return (error);
1793: case IPCTL_LOWPORTMAX:
1794: old = lowportmax;
1795: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1796: if (lowportmin >= lowportmax
1797: || lowportmax > IPPORT_RESERVEDMAX
1798: || lowportmax < IPPORT_RESERVEDMIN
1799: ) {
1800: lowportmax = old;
1801: return (EINVAL);
1802: }
1803: return (error);
1.65 matt 1804: #endif
1.114.4.6 he 1805:
1806: case IPCTL_MAXFRAGPACKETS:
1807: return (sysctl_int(oldp, oldlenp, newp, newlen,
1808: &ip_maxfragpackets));
1.88 sommerfe 1809:
1.13 mycroft 1810: default:
1811: return (EOPNOTSUPP);
1812: }
1813: /* NOTREACHED */
1.1 cgd 1814: }
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