Annotation of src/sys/netinet/ip_input.c, Revision 1.114.4.10
1.114.4.10! itojun 1: /* $NetBSD: ip_input.c,v 1.114.4.9 2002/11/10 19:58:05 itojun 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);
1.114.4.9 itojun 313: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 314: #ifdef GATEWAY
315: ipflow_init();
316: #endif
1.1 cgd 317: }
318:
319: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
320: struct route ipforward_rt;
321:
322: /*
1.89 itojun 323: * IP software interrupt routine
324: */
325: void
326: ipintr()
327: {
328: int s;
329: struct mbuf *m;
330:
331: while (1) {
332: s = splimp();
333: IF_DEQUEUE(&ipintrq, m);
334: splx(s);
335: if (m == 0)
336: return;
337: ip_input(m);
338: }
339: }
340:
341: /*
1.1 cgd 342: * Ip input routine. Checksum and byte swap header. If fragmented
343: * try to reassemble. Process options. Pass to next level.
344: */
1.8 mycroft 345: void
1.89 itojun 346: ip_input(struct mbuf *m)
1.1 cgd 347: {
1.109 augustss 348: struct ip *ip = NULL;
349: struct ipq *fp;
350: struct in_ifaddr *ia;
351: struct ifaddr *ifa;
1.25 cgd 352: struct ipqent *ipqe;
1.89 itojun 353: int hlen = 0, mff, len;
1.100 itojun 354: int downmatch;
1.36 mrg 355: #ifdef PFIL_HOOKS
1.33 mrg 356: struct packet_filter_hook *pfh;
357: struct mbuf *m0;
1.43 mrg 358: int rv;
1.36 mrg 359: #endif /* PFIL_HOOKS */
1.1 cgd 360:
361: #ifdef DIAGNOSTIC
362: if ((m->m_flags & M_PKTHDR) == 0)
363: panic("ipintr no HDR");
364: #endif
1.89 itojun 365: #ifdef IPSEC
366: /*
367: * should the inner packet be considered authentic?
368: * see comment in ah4_input().
369: */
370: if (m) {
371: m->m_flags &= ~M_AUTHIPHDR;
372: m->m_flags &= ~M_AUTHIPDGM;
373: }
374: #endif
1.1 cgd 375: /*
376: * If no IP addresses have been set yet but the interfaces
377: * are receiving, can't do anything with incoming packets yet.
378: */
1.22 mycroft 379: if (in_ifaddr.tqh_first == 0)
1.1 cgd 380: goto bad;
381: ipstat.ips_total++;
382: if (m->m_len < sizeof (struct ip) &&
383: (m = m_pullup(m, sizeof (struct ip))) == 0) {
384: ipstat.ips_toosmall++;
1.89 itojun 385: return;
1.1 cgd 386: }
387: ip = mtod(m, struct ip *);
1.13 mycroft 388: if (ip->ip_v != IPVERSION) {
389: ipstat.ips_badvers++;
390: goto bad;
391: }
1.1 cgd 392: hlen = ip->ip_hl << 2;
393: if (hlen < sizeof(struct ip)) { /* minimum header length */
394: ipstat.ips_badhlen++;
395: goto bad;
396: }
397: if (hlen > m->m_len) {
398: if ((m = m_pullup(m, hlen)) == 0) {
399: ipstat.ips_badhlen++;
1.89 itojun 400: return;
1.1 cgd 401: }
402: ip = mtod(m, struct ip *);
403: }
1.98 thorpej 404:
1.85 hwr 405: /*
1.99 thorpej 406: * RFC1122: packets with a multicast source address are
1.98 thorpej 407: * not allowed.
1.85 hwr 408: */
409: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 410: /* XXX stat */
1.85 hwr 411: goto bad;
412: }
413:
1.78 mycroft 414: if (in_cksum(m, hlen) != 0) {
1.1 cgd 415: ipstat.ips_badsum++;
416: goto bad;
417: }
418:
419: /*
420: * Convert fields to host representation.
421: */
422: NTOHS(ip->ip_len);
423: NTOHS(ip->ip_off);
1.35 mycroft 424: len = ip->ip_len;
1.81 proff 425:
426: /*
427: * Check for additional length bogosity
428: */
1.84 proff 429: if (len < hlen) {
1.81 proff 430: ipstat.ips_badlen++;
431: goto bad;
432: }
1.1 cgd 433:
434: /*
435: * Check that the amount of data in the buffers
436: * is as at least much as the IP header would have us expect.
437: * Trim mbufs if longer than we expect.
438: * Drop packet if shorter than we expect.
439: */
1.35 mycroft 440: if (m->m_pkthdr.len < len) {
1.1 cgd 441: ipstat.ips_tooshort++;
442: goto bad;
443: }
1.35 mycroft 444: if (m->m_pkthdr.len > len) {
1.1 cgd 445: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 446: m->m_len = len;
447: m->m_pkthdr.len = len;
1.1 cgd 448: } else
1.35 mycroft 449: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 450: }
451:
1.94 itojun 452: #ifdef IPSEC
453: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
454: m->m_flags &= ~M_CANFASTFWD;
455: #else
1.64 thorpej 456: /*
457: * Assume that we can create a fast-forward IP flow entry
458: * based on this packet.
459: */
460: m->m_flags |= M_CANFASTFWD;
1.94 itojun 461: #endif
1.64 thorpej 462:
1.36 mrg 463: #ifdef PFIL_HOOKS
1.114.4.5 he 464: #ifdef IPSEC
465: /*
466: * let ipfilter look at packet on the wire,
467: * not the decapsulated packet.
468: */
469: if (ipsec_gethist(m, NULL))
470: goto nofilt;
471: #endif
1.33 mrg 472: /*
1.64 thorpej 473: * Run through list of hooks for input packets. If there are any
474: * filters which require that additional packets in the flow are
475: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
476: * Note that filters must _never_ set this flag, as another filter
477: * in the list may have previously cleared it.
1.33 mrg 478: */
479: m0 = m;
1.102 darrenr 480: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 481: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 482: if (pfh->pfil_func) {
1.101 darrenr 483: rv = pfh->pfil_func(ip, hlen,
484: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 485: if (rv)
1.89 itojun 486: return;
1.68 sommerfe 487: m = m0;
488: if (m == NULL)
1.89 itojun 489: return;
1.68 sommerfe 490: ip = mtod(m, struct ip *);
1.33 mrg 491: }
1.114.4.5 he 492: #ifdef IPSEC
493: nofilt:;
494: #endif
1.36 mrg 495: #endif /* PFIL_HOOKS */
1.33 mrg 496:
1.1 cgd 497: /*
498: * Process options and, if not destined for us,
499: * ship it on. ip_dooptions returns 1 when an
500: * error was detected (causing an icmp message
501: * to be sent and the original packet to be freed).
502: */
503: ip_nhops = 0; /* for source routed packets */
504: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 505: return;
1.1 cgd 506:
507: /*
508: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 509: *
510: * Traditional 4.4BSD did not consult IFF_UP at all.
511: * The behavior here is to treat addresses on !IFF_UP interface
512: * as not mine.
1.1 cgd 513: */
1.100 itojun 514: downmatch = 0;
1.97 itojun 515: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
516: ia != NULL;
517: ia = ia->ia_hash.le_next) {
518: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
519: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
520: break;
1.100 itojun 521: else
522: downmatch++;
1.97 itojun 523: }
524: }
1.86 thorpej 525: if (ia != NULL)
526: goto ours;
1.57 tls 527: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
528: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
529: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
530: if (ifa->ifa_addr->sa_family != AF_INET) continue;
531: ia = ifatoia(ifa);
1.35 mycroft 532: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
533: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 534: /*
535: * Look for all-0's host part (old broadcast addr),
536: * either for subnet or net.
537: */
538: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 539: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 540: goto ours;
1.57 tls 541: /*
542: * An interface with IP address zero accepts
543: * all packets that arrive on that interface.
544: */
545: if (in_nullhost(ia->ia_addr.sin_addr))
546: goto ours;
1.1 cgd 547: }
548: }
1.18 mycroft 549: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 550: struct in_multi *inm;
551: #ifdef MROUTING
552: extern struct socket *ip_mrouter;
1.10 brezak 553:
554: if (m->m_flags & M_EXT) {
555: if ((m = m_pullup(m, hlen)) == 0) {
556: ipstat.ips_toosmall++;
1.89 itojun 557: return;
1.10 brezak 558: }
559: ip = mtod(m, struct ip *);
560: }
1.4 hpeyerl 561:
562: if (ip_mrouter) {
563: /*
564: * If we are acting as a multicast router, all
565: * incoming multicast packets are passed to the
566: * kernel-level multicast forwarding function.
567: * The packet is returned (relatively) intact; if
568: * ip_mforward() returns a non-zero value, the packet
569: * must be discarded, else it may be accepted below.
570: *
571: * (The IP ident field is put in the same byte order
572: * as expected when ip_mforward() is called from
573: * ip_output().)
574: */
1.13 mycroft 575: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
576: ipstat.ips_cantforward++;
1.4 hpeyerl 577: m_freem(m);
1.89 itojun 578: return;
1.4 hpeyerl 579: }
580:
581: /*
582: * The process-level routing demon needs to receive
583: * all multicast IGMP packets, whether or not this
584: * host belongs to their destination groups.
585: */
586: if (ip->ip_p == IPPROTO_IGMP)
587: goto ours;
1.13 mycroft 588: ipstat.ips_forward++;
1.4 hpeyerl 589: }
590: #endif
591: /*
592: * See if we belong to the destination multicast group on the
593: * arrival interface.
594: */
595: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
596: if (inm == NULL) {
1.13 mycroft 597: ipstat.ips_cantforward++;
1.4 hpeyerl 598: m_freem(m);
1.89 itojun 599: return;
1.4 hpeyerl 600: }
601: goto ours;
602: }
1.19 mycroft 603: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 604: in_nullhost(ip->ip_dst))
1.1 cgd 605: goto ours;
606:
607: /*
608: * Not for us; forward if possible and desirable.
609: */
610: if (ipforwarding == 0) {
611: ipstat.ips_cantforward++;
612: m_freem(m);
1.100 itojun 613: } else {
614: /*
615: * If ip_dst matched any of my address on !IFF_UP interface,
616: * and there's no IFF_UP interface that matches ip_dst,
617: * send icmp unreach. Forwarding it will result in in-kernel
618: * forwarding loop till TTL goes to 0.
619: */
620: if (downmatch) {
621: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
622: ipstat.ips_cantforward++;
623: return;
624: }
1.114.4.8 he 625: #ifdef IPSEC
626: if (ipsec4_in_reject(m, NULL)) {
627: ipsecstat.in_polvio++;
628: goto bad;
629: }
630: #endif
631:
1.1 cgd 632: ip_forward(m, 0);
1.100 itojun 633: }
1.89 itojun 634: return;
1.1 cgd 635:
636: ours:
637: /*
638: * If offset or IP_MF are set, must reassemble.
639: * Otherwise, nothing need be done.
640: * (We could look in the reassembly queue to see
641: * if the packet was previously fragmented,
642: * but it's not worth the time; just let them time out.)
643: */
1.37 perry 644: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 645: /*
646: * Look for queue of fragments
647: * of this datagram.
648: */
1.75 thorpej 649: IPQ_LOCK();
1.25 cgd 650: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 651: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 652: in_hosteq(ip->ip_src, fp->ipq_src) &&
653: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 654: ip->ip_p == fp->ipq_p)
655: goto found;
656: fp = 0;
657: found:
658:
659: /*
660: * Adjust ip_len to not reflect header,
1.25 cgd 661: * set ipqe_mff if more fragments are expected,
1.1 cgd 662: * convert offset of this to bytes.
663: */
664: ip->ip_len -= hlen;
1.25 cgd 665: mff = (ip->ip_off & IP_MF) != 0;
666: if (mff) {
1.16 cgd 667: /*
668: * Make sure that fragments have a data length
669: * that's a non-zero multiple of 8 bytes.
670: */
1.17 cgd 671: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 672: ipstat.ips_badfrags++;
1.75 thorpej 673: IPQ_UNLOCK();
1.16 cgd 674: goto bad;
675: }
676: }
1.1 cgd 677: ip->ip_off <<= 3;
678:
679: /*
680: * If datagram marked as having more fragments
681: * or if this is not the first fragment,
682: * attempt reassembly; if it succeeds, proceed.
683: */
1.25 cgd 684: if (mff || ip->ip_off) {
1.1 cgd 685: ipstat.ips_fragments++;
1.72 thorpej 686: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 687: if (ipqe == NULL) {
688: ipstat.ips_rcvmemdrop++;
1.75 thorpej 689: IPQ_UNLOCK();
1.25 cgd 690: goto bad;
691: }
692: ipqe->ipqe_mff = mff;
1.50 thorpej 693: ipqe->ipqe_m = m;
1.25 cgd 694: ipqe->ipqe_ip = ip;
1.50 thorpej 695: m = ip_reass(ipqe, fp);
1.75 thorpej 696: if (m == 0) {
697: IPQ_UNLOCK();
1.89 itojun 698: return;
1.75 thorpej 699: }
1.13 mycroft 700: ipstat.ips_reassembled++;
1.50 thorpej 701: ip = mtod(m, struct ip *);
1.74 thorpej 702: hlen = ip->ip_hl << 2;
1.79 mycroft 703: ip->ip_len += hlen;
1.1 cgd 704: } else
705: if (fp)
706: ip_freef(fp);
1.75 thorpej 707: IPQ_UNLOCK();
1.79 mycroft 708: }
1.114.4.4 he 709:
710: #ifdef IPSEC
711: /*
712: * enforce IPsec policy checking if we are seeing last header.
713: * note that we do not visit this with protocols with pcb layer
714: * code - like udp/tcp/raw ip.
715: */
716: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
717: ipsec4_in_reject(m, NULL)) {
718: ipsecstat.in_polvio++;
719: goto bad;
720: }
721: #endif
1.1 cgd 722:
723: /*
724: * Switch out to protocol's input routine.
725: */
1.82 aidan 726: #if IFA_STATS
727: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
728: #endif
1.1 cgd 729: ipstat.ips_delivered++;
1.89 itojun 730: {
731: int off = hlen, nh = ip->ip_p;
732:
733: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
734: return;
735: }
1.1 cgd 736: bad:
737: m_freem(m);
738: }
739:
740: /*
741: * Take incoming datagram fragment and try to
742: * reassemble it into whole datagram. If a chain for
743: * reassembly of this datagram already exists, then it
744: * is given as fp; otherwise have to make a chain.
745: */
1.50 thorpej 746: struct mbuf *
1.25 cgd 747: ip_reass(ipqe, fp)
1.109 augustss 748: struct ipqent *ipqe;
749: struct ipq *fp;
1.1 cgd 750: {
1.109 augustss 751: struct mbuf *m = ipqe->ipqe_m;
752: struct ipqent *nq, *p, *q;
1.25 cgd 753: struct ip *ip;
1.1 cgd 754: struct mbuf *t;
1.25 cgd 755: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 756: int i, next;
757:
1.75 thorpej 758: IPQ_LOCK_CHECK();
759:
1.1 cgd 760: /*
761: * Presence of header sizes in mbufs
762: * would confuse code below.
763: */
764: m->m_data += hlen;
765: m->m_len -= hlen;
766:
767: /*
768: * If first fragment to arrive, create a reassembly queue.
769: */
770: if (fp == 0) {
1.114.4.6 he 771: /*
772: * Enforce upper bound on number of fragmented packets
773: * for which we attempt reassembly;
774: * If maxfrag is 0, never accept fragments.
775: * If maxfrag is -1, accept all fragments without limitation.
776: */
777: if (ip_maxfragpackets < 0)
778: ;
779: else if (ip_nfragpackets >= ip_maxfragpackets)
780: goto dropfrag;
781: ip_nfragpackets++;
1.50 thorpej 782: MALLOC(fp, struct ipq *, sizeof (struct ipq),
783: M_FTABLE, M_NOWAIT);
784: if (fp == NULL)
1.1 cgd 785: goto dropfrag;
1.25 cgd 786: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 787: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 788: fp->ipq_p = ipqe->ipqe_ip->ip_p;
789: fp->ipq_id = ipqe->ipqe_ip->ip_id;
790: LIST_INIT(&fp->ipq_fragq);
791: fp->ipq_src = ipqe->ipqe_ip->ip_src;
792: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
793: p = NULL;
1.1 cgd 794: goto insert;
795: }
796:
797: /*
798: * Find a segment which begins after this one does.
799: */
1.25 cgd 800: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
801: p = q, q = q->ipqe_q.le_next)
802: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 803: break;
804:
805: /*
806: * If there is a preceding segment, it may provide some of
807: * our data already. If so, drop the data from the incoming
808: * segment. If it provides all of our data, drop us.
809: */
1.25 cgd 810: if (p != NULL) {
811: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
812: ipqe->ipqe_ip->ip_off;
1.1 cgd 813: if (i > 0) {
1.25 cgd 814: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 815: goto dropfrag;
1.50 thorpej 816: m_adj(ipqe->ipqe_m, i);
1.25 cgd 817: ipqe->ipqe_ip->ip_off += i;
818: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 819: }
820: }
821:
822: /*
823: * While we overlap succeeding segments trim them or,
824: * if they are completely covered, dequeue them.
825: */
1.25 cgd 826: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
827: q->ipqe_ip->ip_off; q = nq) {
828: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
829: q->ipqe_ip->ip_off;
830: if (i < q->ipqe_ip->ip_len) {
831: q->ipqe_ip->ip_len -= i;
832: q->ipqe_ip->ip_off += i;
1.50 thorpej 833: m_adj(q->ipqe_m, i);
1.1 cgd 834: break;
835: }
1.25 cgd 836: nq = q->ipqe_q.le_next;
1.50 thorpej 837: m_freem(q->ipqe_m);
1.25 cgd 838: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 839: pool_put(&ipqent_pool, q);
1.1 cgd 840: }
841:
842: insert:
843: /*
844: * Stick new segment in its place;
845: * check for complete reassembly.
846: */
1.25 cgd 847: if (p == NULL) {
848: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
849: } else {
850: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
851: }
1.1 cgd 852: next = 0;
1.25 cgd 853: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
854: p = q, q = q->ipqe_q.le_next) {
855: if (q->ipqe_ip->ip_off != next)
1.1 cgd 856: return (0);
1.25 cgd 857: next += q->ipqe_ip->ip_len;
1.1 cgd 858: }
1.25 cgd 859: if (p->ipqe_mff)
1.1 cgd 860: return (0);
861:
862: /*
1.41 thorpej 863: * Reassembly is complete. Check for a bogus message size and
864: * concatenate fragments.
1.1 cgd 865: */
1.25 cgd 866: q = fp->ipq_fragq.lh_first;
867: ip = q->ipqe_ip;
1.41 thorpej 868: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
869: ipstat.ips_toolong++;
870: ip_freef(fp);
871: return (0);
872: }
1.50 thorpej 873: m = q->ipqe_m;
1.1 cgd 874: t = m->m_next;
875: m->m_next = 0;
876: m_cat(m, t);
1.25 cgd 877: nq = q->ipqe_q.le_next;
1.72 thorpej 878: pool_put(&ipqent_pool, q);
1.25 cgd 879: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 880: t = q->ipqe_m;
1.25 cgd 881: nq = q->ipqe_q.le_next;
1.72 thorpej 882: pool_put(&ipqent_pool, q);
1.1 cgd 883: m_cat(m, t);
884: }
885:
886: /*
887: * Create header for new ip packet by
888: * modifying header of first packet;
889: * dequeue and discard fragment reassembly header.
890: * Make header visible.
891: */
892: ip->ip_len = next;
1.25 cgd 893: ip->ip_src = fp->ipq_src;
894: ip->ip_dst = fp->ipq_dst;
895: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 896: FREE(fp, M_FTABLE);
1.114.4.6 he 897: ip_nfragpackets--;
1.1 cgd 898: m->m_len += (ip->ip_hl << 2);
899: m->m_data -= (ip->ip_hl << 2);
900: /* some debugging cruft by sklower, below, will go away soon */
901: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 902: int plen = 0;
1.50 thorpej 903: for (t = m; t; t = t->m_next)
904: plen += t->m_len;
905: m->m_pkthdr.len = plen;
1.1 cgd 906: }
1.50 thorpej 907: return (m);
1.1 cgd 908:
909: dropfrag:
910: ipstat.ips_fragdropped++;
911: m_freem(m);
1.72 thorpej 912: pool_put(&ipqent_pool, ipqe);
1.1 cgd 913: return (0);
914: }
915:
916: /*
917: * Free a fragment reassembly header and all
918: * associated datagrams.
919: */
1.8 mycroft 920: void
1.1 cgd 921: ip_freef(fp)
922: struct ipq *fp;
923: {
1.109 augustss 924: struct ipqent *q, *p;
1.1 cgd 925:
1.75 thorpej 926: IPQ_LOCK_CHECK();
927:
1.25 cgd 928: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
929: p = q->ipqe_q.le_next;
1.50 thorpej 930: m_freem(q->ipqe_m);
1.25 cgd 931: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 932: pool_put(&ipqent_pool, q);
1.1 cgd 933: }
1.25 cgd 934: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 935: FREE(fp, M_FTABLE);
1.114.4.6 he 936: ip_nfragpackets--;
1.1 cgd 937: }
938:
939: /*
940: * IP timer processing;
941: * if a timer expires on a reassembly
942: * queue, discard it.
943: */
1.8 mycroft 944: void
1.1 cgd 945: ip_slowtimo()
946: {
1.109 augustss 947: struct ipq *fp, *nfp;
1.24 mycroft 948: int s = splsoftnet();
1.1 cgd 949:
1.75 thorpej 950: IPQ_LOCK();
1.25 cgd 951: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
952: nfp = fp->ipq_q.le_next;
953: if (--fp->ipq_ttl == 0) {
1.1 cgd 954: ipstat.ips_fragtimeout++;
1.25 cgd 955: ip_freef(fp);
1.1 cgd 956: }
957: }
1.114.4.6 he 958: /*
959: * If we are over the maximum number of fragments
960: * (due to the limit being lowered), drain off
961: * enough to get down to the new limit.
962: */
963: if (ip_maxfragpackets < 0)
964: ;
965: else {
966: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
967: ip_freef(ipq.lh_first);
968: }
1.75 thorpej 969: IPQ_UNLOCK();
1.63 matt 970: #ifdef GATEWAY
971: ipflow_slowtimo();
972: #endif
1.1 cgd 973: splx(s);
974: }
975:
976: /*
977: * Drain off all datagram fragments.
978: */
1.8 mycroft 979: void
1.1 cgd 980: ip_drain()
981: {
982:
1.75 thorpej 983: /*
984: * We may be called from a device's interrupt context. If
985: * the ipq is already busy, just bail out now.
986: */
987: if (ipq_lock_try() == 0)
988: return;
989:
1.25 cgd 990: while (ipq.lh_first != NULL) {
1.1 cgd 991: ipstat.ips_fragdropped++;
1.25 cgd 992: ip_freef(ipq.lh_first);
1.1 cgd 993: }
1.75 thorpej 994:
995: IPQ_UNLOCK();
1.1 cgd 996: }
997:
998: /*
999: * Do option processing on a datagram,
1000: * possibly discarding it if bad options are encountered,
1001: * or forwarding it if source-routed.
1002: * Returns 1 if packet has been forwarded/freed,
1003: * 0 if the packet should be processed further.
1004: */
1.8 mycroft 1005: int
1.1 cgd 1006: ip_dooptions(m)
1007: struct mbuf *m;
1008: {
1.109 augustss 1009: struct ip *ip = mtod(m, struct ip *);
1010: u_char *cp, *cp0;
1011: struct ip_timestamp *ipt;
1012: struct in_ifaddr *ia;
1.1 cgd 1013: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1014: struct in_addr dst;
1.1 cgd 1015: n_time ntime;
1016:
1.13 mycroft 1017: dst = ip->ip_dst;
1.1 cgd 1018: cp = (u_char *)(ip + 1);
1019: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1020: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1021: opt = cp[IPOPT_OPTVAL];
1022: if (opt == IPOPT_EOL)
1023: break;
1024: if (opt == IPOPT_NOP)
1025: optlen = 1;
1026: else {
1.113 itojun 1027: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1028: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1029: goto bad;
1030: }
1.1 cgd 1031: optlen = cp[IPOPT_OLEN];
1.114 itojun 1032: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1033: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1034: goto bad;
1035: }
1036: }
1037: switch (opt) {
1038:
1039: default:
1040: break;
1041:
1042: /*
1043: * Source routing with record.
1044: * Find interface with current destination address.
1045: * If none on this machine then drop if strictly routed,
1046: * or do nothing if loosely routed.
1047: * Record interface address and bring up next address
1048: * component. If strictly routed make sure next
1049: * address is on directly accessible net.
1050: */
1051: case IPOPT_LSRR:
1052: case IPOPT_SSRR:
1.47 cjs 1053: if (ip_allowsrcrt == 0) {
1054: type = ICMP_UNREACH;
1055: code = ICMP_UNREACH_NET_PROHIB;
1056: goto bad;
1057: }
1.114 itojun 1058: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1059: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1060: goto bad;
1061: }
1.1 cgd 1062: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1063: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1064: goto bad;
1065: }
1066: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1067: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1068: if (ia == 0) {
1069: if (opt == IPOPT_SSRR) {
1070: type = ICMP_UNREACH;
1071: code = ICMP_UNREACH_SRCFAIL;
1072: goto bad;
1073: }
1074: /*
1075: * Loose routing, and not at next destination
1076: * yet; nothing to do except forward.
1077: */
1078: break;
1079: }
1080: off--; /* 0 origin */
1.112 sommerfe 1081: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1082: /*
1083: * End of source route. Should be for us.
1084: */
1085: save_rte(cp, ip->ip_src);
1086: break;
1087: }
1088: /*
1089: * locate outgoing interface
1090: */
1091: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1092: sizeof(ipaddr.sin_addr));
1.96 thorpej 1093: if (opt == IPOPT_SSRR)
1094: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1095: else
1.1 cgd 1096: ia = ip_rtaddr(ipaddr.sin_addr);
1097: if (ia == 0) {
1098: type = ICMP_UNREACH;
1099: code = ICMP_UNREACH_SRCFAIL;
1100: goto bad;
1101: }
1102: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1103: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1104: (caddr_t)(cp + off), sizeof(struct in_addr));
1105: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1106: /*
1107: * Let ip_intr's mcast routing check handle mcast pkts
1108: */
1.18 mycroft 1109: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1110: break;
1111:
1112: case IPOPT_RR:
1.114 itojun 1113: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1114: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1115: goto bad;
1116: }
1.1 cgd 1117: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1118: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1119: goto bad;
1120: }
1121: /*
1122: * If no space remains, ignore.
1123: */
1124: off--; /* 0 origin */
1.112 sommerfe 1125: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1126: break;
1127: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1128: sizeof(ipaddr.sin_addr));
1129: /*
1130: * locate outgoing interface; if we're the destination,
1131: * use the incoming interface (should be same).
1132: */
1.96 thorpej 1133: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1134: == NULL &&
1135: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1136: type = ICMP_UNREACH;
1137: code = ICMP_UNREACH_HOST;
1138: goto bad;
1139: }
1.20 mycroft 1140: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1141: (caddr_t)(cp + off), sizeof(struct in_addr));
1142: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1143: break;
1144:
1145: case IPOPT_TS:
1146: code = cp - (u_char *)ip;
1147: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1148: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1149: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1150: goto bad;
1.114 itojun 1151: }
1152: if (ipt->ipt_ptr < 5) {
1153: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1154: goto bad;
1155: }
1.15 cgd 1156: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1157: if (++ipt->ipt_oflw == 0) {
1158: code = (u_char *)&ipt->ipt_ptr -
1159: (u_char *)ip;
1.1 cgd 1160: goto bad;
1.114 itojun 1161: }
1.1 cgd 1162: break;
1163: }
1.104 thorpej 1164: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1165: switch (ipt->ipt_flg) {
1166:
1167: case IPOPT_TS_TSONLY:
1168: break;
1169:
1170: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1171: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1172: sizeof(struct in_addr) > ipt->ipt_len) {
1173: code = (u_char *)&ipt->ipt_ptr -
1174: (u_char *)ip;
1.1 cgd 1175: goto bad;
1.114 itojun 1176: }
1.13 mycroft 1177: ipaddr.sin_addr = dst;
1.96 thorpej 1178: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1179: m->m_pkthdr.rcvif));
1.13 mycroft 1180: if (ia == 0)
1181: continue;
1.104 thorpej 1182: bcopy(&ia->ia_addr.sin_addr,
1183: cp0, sizeof(struct in_addr));
1.1 cgd 1184: ipt->ipt_ptr += sizeof(struct in_addr);
1185: break;
1186:
1187: case IPOPT_TS_PRESPEC:
1.66 thorpej 1188: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1189: sizeof(struct in_addr) > ipt->ipt_len) {
1190: code = (u_char *)&ipt->ipt_ptr -
1191: (u_char *)ip;
1.1 cgd 1192: goto bad;
1.114 itojun 1193: }
1.104 thorpej 1194: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1195: sizeof(struct in_addr));
1.96 thorpej 1196: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1197: == NULL)
1.1 cgd 1198: continue;
1199: ipt->ipt_ptr += sizeof(struct in_addr);
1200: break;
1201:
1202: default:
1.114 itojun 1203: /* XXX can't take &ipt->ipt_flg */
1204: code = (u_char *)&ipt->ipt_ptr -
1205: (u_char *)ip + 1;
1.1 cgd 1206: goto bad;
1207: }
1208: ntime = iptime();
1.107 thorpej 1209: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1210: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1211: sizeof(n_time));
1212: ipt->ipt_ptr += sizeof(n_time);
1213: }
1214: }
1215: if (forward) {
1.26 thorpej 1216: if (ip_forwsrcrt == 0) {
1217: type = ICMP_UNREACH;
1218: code = ICMP_UNREACH_SRCFAIL;
1219: goto bad;
1220: }
1.1 cgd 1221: ip_forward(m, 1);
1222: return (1);
1.13 mycroft 1223: }
1224: return (0);
1.1 cgd 1225: bad:
1.13 mycroft 1226: icmp_error(m, type, code, 0, 0);
1227: ipstat.ips_badoptions++;
1.1 cgd 1228: return (1);
1229: }
1230:
1231: /*
1232: * Given address of next destination (final or next hop),
1233: * return internet address info of interface to be used to get there.
1234: */
1235: struct in_ifaddr *
1236: ip_rtaddr(dst)
1237: struct in_addr dst;
1238: {
1.109 augustss 1239: struct sockaddr_in *sin;
1.1 cgd 1240:
1.19 mycroft 1241: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1242:
1.35 mycroft 1243: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1244: if (ipforward_rt.ro_rt) {
1245: RTFREE(ipforward_rt.ro_rt);
1246: ipforward_rt.ro_rt = 0;
1247: }
1248: sin->sin_family = AF_INET;
1249: sin->sin_len = sizeof(*sin);
1250: sin->sin_addr = dst;
1251:
1252: rtalloc(&ipforward_rt);
1253: }
1254: if (ipforward_rt.ro_rt == 0)
1255: return ((struct in_ifaddr *)0);
1.19 mycroft 1256: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1257: }
1258:
1259: /*
1260: * Save incoming source route for use in replies,
1261: * to be picked up later by ip_srcroute if the receiver is interested.
1262: */
1.13 mycroft 1263: void
1.1 cgd 1264: save_rte(option, dst)
1265: u_char *option;
1266: struct in_addr dst;
1267: {
1268: unsigned olen;
1269:
1270: olen = option[IPOPT_OLEN];
1271: #ifdef DIAGNOSTIC
1272: if (ipprintfs)
1.39 christos 1273: printf("save_rte: olen %d\n", olen);
1.89 itojun 1274: #endif /* 0 */
1.1 cgd 1275: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1276: return;
1277: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1278: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1279: ip_srcrt.dst = dst;
1280: }
1281:
1282: /*
1283: * Retrieve incoming source route for use in replies,
1284: * in the same form used by setsockopt.
1285: * The first hop is placed before the options, will be removed later.
1286: */
1287: struct mbuf *
1288: ip_srcroute()
1289: {
1.109 augustss 1290: struct in_addr *p, *q;
1291: struct mbuf *m;
1.1 cgd 1292:
1293: if (ip_nhops == 0)
1294: return ((struct mbuf *)0);
1295: m = m_get(M_DONTWAIT, MT_SOOPTS);
1296: if (m == 0)
1297: return ((struct mbuf *)0);
1298:
1.13 mycroft 1299: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1300:
1301: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1302: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1303: OPTSIZ;
1304: #ifdef DIAGNOSTIC
1305: if (ipprintfs)
1.39 christos 1306: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1307: #endif
1308:
1309: /*
1310: * First save first hop for return route
1311: */
1312: p = &ip_srcrt.route[ip_nhops - 1];
1313: *(mtod(m, struct in_addr *)) = *p--;
1314: #ifdef DIAGNOSTIC
1315: if (ipprintfs)
1.39 christos 1316: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1317: #endif
1318:
1319: /*
1320: * Copy option fields and padding (nop) to mbuf.
1321: */
1322: ip_srcrt.nop = IPOPT_NOP;
1323: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1324: bcopy((caddr_t)&ip_srcrt.nop,
1325: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1326: q = (struct in_addr *)(mtod(m, caddr_t) +
1327: sizeof(struct in_addr) + OPTSIZ);
1328: #undef OPTSIZ
1329: /*
1330: * Record return path as an IP source route,
1331: * reversing the path (pointers are now aligned).
1332: */
1333: while (p >= ip_srcrt.route) {
1334: #ifdef DIAGNOSTIC
1335: if (ipprintfs)
1.39 christos 1336: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1337: #endif
1338: *q++ = *p--;
1339: }
1340: /*
1341: * Last hop goes to final destination.
1342: */
1343: *q = ip_srcrt.dst;
1344: #ifdef DIAGNOSTIC
1345: if (ipprintfs)
1.39 christos 1346: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1347: #endif
1348: return (m);
1349: }
1350:
1351: /*
1352: * Strip out IP options, at higher
1353: * level protocol in the kernel.
1354: * Second argument is buffer to which options
1355: * will be moved, and return value is their length.
1356: * XXX should be deleted; last arg currently ignored.
1357: */
1.8 mycroft 1358: void
1.1 cgd 1359: ip_stripoptions(m, mopt)
1.109 augustss 1360: struct mbuf *m;
1.1 cgd 1361: struct mbuf *mopt;
1362: {
1.109 augustss 1363: int i;
1.1 cgd 1364: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1365: caddr_t opts;
1.1 cgd 1366: int olen;
1367:
1.79 mycroft 1368: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1369: opts = (caddr_t)(ip + 1);
1370: i = m->m_len - (sizeof (struct ip) + olen);
1371: bcopy(opts + olen, opts, (unsigned)i);
1372: m->m_len -= olen;
1373: if (m->m_flags & M_PKTHDR)
1374: m->m_pkthdr.len -= olen;
1.79 mycroft 1375: ip->ip_len -= olen;
1376: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1377: }
1378:
1.23 mycroft 1379: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1380: 0, 0, 0, 0,
1381: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1382: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1383: EMSGSIZE, EHOSTUNREACH, 0, 0,
1384: 0, 0, 0, 0,
1385: ENOPROTOOPT
1386: };
1387:
1388: /*
1389: * Forward a packet. If some error occurs return the sender
1390: * an icmp packet. Note we can't always generate a meaningful
1391: * icmp message because icmp doesn't have a large enough repertoire
1392: * of codes and types.
1393: *
1394: * If not forwarding, just drop the packet. This could be confusing
1395: * if ipforwarding was zero but some routing protocol was advancing
1396: * us as a gateway to somewhere. However, we must let the routing
1397: * protocol deal with that.
1398: *
1399: * The srcrt parameter indicates whether the packet is being forwarded
1400: * via a source route.
1401: */
1.13 mycroft 1402: void
1.1 cgd 1403: ip_forward(m, srcrt)
1404: struct mbuf *m;
1405: int srcrt;
1406: {
1.109 augustss 1407: struct ip *ip = mtod(m, struct ip *);
1408: struct sockaddr_in *sin;
1409: struct rtentry *rt;
1.28 christos 1410: int error, type = 0, code = 0;
1.1 cgd 1411: struct mbuf *mcopy;
1.13 mycroft 1412: n_long dest;
1413: struct ifnet *destifp;
1.89 itojun 1414: #ifdef IPSEC
1415: struct ifnet dummyifp;
1416: #endif
1.1 cgd 1417:
1.13 mycroft 1418: dest = 0;
1.1 cgd 1419: #ifdef DIAGNOSTIC
1420: if (ipprintfs)
1.70 thorpej 1421: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1422: ntohl(ip->ip_src.s_addr),
1423: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1424: #endif
1.93 sommerfe 1425: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1426: ipstat.ips_cantforward++;
1427: m_freem(m);
1428: return;
1429: }
1430: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1431: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1432: return;
1433: }
1434: ip->ip_ttl -= IPTTLDEC;
1435:
1.19 mycroft 1436: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1437: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1438: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1439: if (ipforward_rt.ro_rt) {
1440: RTFREE(ipforward_rt.ro_rt);
1441: ipforward_rt.ro_rt = 0;
1442: }
1443: sin->sin_family = AF_INET;
1.35 mycroft 1444: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1445: sin->sin_addr = ip->ip_dst;
1446:
1447: rtalloc(&ipforward_rt);
1448: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1449: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1450: return;
1451: }
1452: rt = ipforward_rt.ro_rt;
1453: }
1454:
1455: /*
1.34 mycroft 1456: * Save at most 68 bytes of the packet in case
1.1 cgd 1457: * we need to generate an ICMP message to the src.
1.114.4.3 tv 1458: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1459: */
1.114.4.3 tv 1460: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1461: if (mcopy)
1462: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1463:
1464: /*
1465: * If forwarding packet using same interface that it came in on,
1466: * perhaps should send a redirect to sender to shortcut a hop.
1467: * Only send redirect if source is sending directly to us,
1468: * and if packet was not source routed (or has any options).
1469: * Also, don't send redirect if forwarding using a default route
1470: * or a route modified by a redirect.
1471: */
1472: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1473: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1474: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1475: ipsendredirects && !srcrt) {
1.19 mycroft 1476: if (rt->rt_ifa &&
1477: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1478: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1479: if (rt->rt_flags & RTF_GATEWAY)
1480: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1481: else
1482: dest = ip->ip_dst.s_addr;
1483: /*
1484: * Router requirements says to only send host
1485: * redirects.
1486: */
1487: type = ICMP_REDIRECT;
1488: code = ICMP_REDIRECT_HOST;
1.1 cgd 1489: #ifdef DIAGNOSTIC
1.77 thorpej 1490: if (ipprintfs)
1491: printf("redirect (%d) to %x\n", code,
1492: (u_int32_t)dest);
1.1 cgd 1493: #endif
1494: }
1495: }
1496:
1.89 itojun 1497: #ifdef IPSEC
1.103 itojun 1498: /* Don't lookup socket in forwading case */
1.114.4.5 he 1499: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1500: #endif
1.27 thorpej 1501: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1502: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1503: if (error)
1504: ipstat.ips_cantforward++;
1505: else {
1506: ipstat.ips_forward++;
1507: if (type)
1508: ipstat.ips_redirectsent++;
1509: else {
1.63 matt 1510: if (mcopy) {
1511: #ifdef GATEWAY
1.64 thorpej 1512: if (mcopy->m_flags & M_CANFASTFWD)
1513: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1514: #endif
1.1 cgd 1515: m_freem(mcopy);
1.63 matt 1516: }
1.1 cgd 1517: return;
1518: }
1519: }
1520: if (mcopy == NULL)
1521: return;
1.13 mycroft 1522: destifp = NULL;
1523:
1.1 cgd 1524: switch (error) {
1525:
1526: case 0: /* forwarded, but need redirect */
1527: /* type, code set above */
1528: break;
1529:
1530: case ENETUNREACH: /* shouldn't happen, checked above */
1531: case EHOSTUNREACH:
1532: case ENETDOWN:
1533: case EHOSTDOWN:
1534: default:
1535: type = ICMP_UNREACH;
1536: code = ICMP_UNREACH_HOST;
1537: break;
1538:
1539: case EMSGSIZE:
1540: type = ICMP_UNREACH;
1541: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1542: #ifndef IPSEC
1.13 mycroft 1543: if (ipforward_rt.ro_rt)
1544: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1545: #else
1546: /*
1547: * If the packet is routed over IPsec tunnel, tell the
1548: * originator the tunnel MTU.
1549: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1550: * XXX quickhack!!!
1551: */
1552: if (ipforward_rt.ro_rt) {
1553: struct secpolicy *sp;
1554: int ipsecerror;
1.95 itojun 1555: size_t ipsechdr;
1.89 itojun 1556: struct route *ro;
1557:
1558: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1559: IPSEC_DIR_OUTBOUND,
1560: IP_FORWARDING,
1561: &ipsecerror);
1.89 itojun 1562:
1563: if (sp == NULL)
1564: destifp = ipforward_rt.ro_rt->rt_ifp;
1565: else {
1566: /* count IPsec header size */
1.95 itojun 1567: ipsechdr = ipsec4_hdrsiz(mcopy,
1568: IPSEC_DIR_OUTBOUND,
1569: NULL);
1.89 itojun 1570:
1571: /*
1572: * find the correct route for outer IPv4
1573: * header, compute tunnel MTU.
1574: *
1575: * XXX BUG ALERT
1576: * The "dummyifp" code relies upon the fact
1577: * that icmp_error() touches only ifp->if_mtu.
1578: */
1579: /*XXX*/
1580: destifp = NULL;
1581: if (sp->req != NULL
1.95 itojun 1582: && sp->req->sav != NULL
1583: && sp->req->sav->sah != NULL) {
1584: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1585: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1586: dummyifp.if_mtu =
1587: ro->ro_rt->rt_ifp->if_mtu;
1588: dummyifp.if_mtu -= ipsechdr;
1589: destifp = &dummyifp;
1590: }
1591: }
1592:
1593: key_freesp(sp);
1594: }
1595: }
1596: #endif /*IPSEC*/
1.1 cgd 1597: ipstat.ips_cantfrag++;
1598: break;
1599:
1600: case ENOBUFS:
1601: type = ICMP_SOURCEQUENCH;
1602: code = 0;
1603: break;
1604: }
1.13 mycroft 1605: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1606: }
1607:
1608: void
1609: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1610: struct inpcb *inp;
1611: struct mbuf **mp;
1612: struct ip *ip;
1613: struct mbuf *m;
1.44 thorpej 1614: {
1615:
1616: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1617: struct timeval tv;
1618:
1619: microtime(&tv);
1620: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1621: SCM_TIMESTAMP, SOL_SOCKET);
1622: if (*mp)
1623: mp = &(*mp)->m_next;
1624: }
1625: if (inp->inp_flags & INP_RECVDSTADDR) {
1626: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1627: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1628: if (*mp)
1629: mp = &(*mp)->m_next;
1630: }
1631: #ifdef notyet
1632: /*
1633: * XXX
1634: * Moving these out of udp_input() made them even more broken
1635: * than they already were.
1636: * - fenner@parc.xerox.com
1637: */
1638: /* options were tossed already */
1639: if (inp->inp_flags & INP_RECVOPTS) {
1640: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1641: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1642: if (*mp)
1643: mp = &(*mp)->m_next;
1644: }
1645: /* ip_srcroute doesn't do what we want here, need to fix */
1646: if (inp->inp_flags & INP_RECVRETOPTS) {
1647: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1648: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1649: if (*mp)
1650: mp = &(*mp)->m_next;
1651: }
1652: #endif
1653: if (inp->inp_flags & INP_RECVIF) {
1654: struct sockaddr_dl sdl;
1655:
1656: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1657: sdl.sdl_family = AF_LINK;
1658: sdl.sdl_index = m->m_pkthdr.rcvif ?
1659: m->m_pkthdr.rcvif->if_index : 0;
1660: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1661: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1662: IP_RECVIF, IPPROTO_IP);
1663: if (*mp)
1664: mp = &(*mp)->m_next;
1665: }
1.13 mycroft 1666: }
1667:
1668: int
1669: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1670: int *name;
1671: u_int namelen;
1672: void *oldp;
1673: size_t *oldlenp;
1674: void *newp;
1675: size_t newlen;
1676: {
1.88 sommerfe 1677: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1678:
1.54 lukem 1679: int error, old;
1680:
1.13 mycroft 1681: /* All sysctl names at this level are terminal. */
1682: if (namelen != 1)
1683: return (ENOTDIR);
1684:
1685: switch (name[0]) {
1686: case IPCTL_FORWARDING:
1687: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1688: case IPCTL_SENDREDIRECTS:
1689: return (sysctl_int(oldp, oldlenp, newp, newlen,
1690: &ipsendredirects));
1691: case IPCTL_DEFTTL:
1692: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1693: #ifdef notyet
1694: case IPCTL_DEFMTU:
1695: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1696: #endif
1.26 thorpej 1697: case IPCTL_FORWSRCRT:
1.47 cjs 1698: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1699: if (securelevel > 0)
1.46 cjs 1700: return (sysctl_rdint(oldp, oldlenp, newp,
1701: ip_forwsrcrt));
1702: else
1703: return (sysctl_int(oldp, oldlenp, newp, newlen,
1704: &ip_forwsrcrt));
1.27 thorpej 1705: case IPCTL_DIRECTEDBCAST:
1706: return (sysctl_int(oldp, oldlenp, newp, newlen,
1707: &ip_directedbcast));
1.47 cjs 1708: case IPCTL_ALLOWSRCRT:
1709: return (sysctl_int(oldp, oldlenp, newp, newlen,
1710: &ip_allowsrcrt));
1.52 thorpej 1711: case IPCTL_SUBNETSARELOCAL:
1712: return (sysctl_int(oldp, oldlenp, newp, newlen,
1713: &subnetsarelocal));
1.53 kml 1714: case IPCTL_MTUDISC:
1.60 kml 1715: error = sysctl_int(oldp, oldlenp, newp, newlen,
1716: &ip_mtudisc);
1.114.4.10! itojun 1717: if (error == 0 && ip_mtudisc == 0)
! 1718: rt_timer_queue_remove_all(ip_mtudisc_timeout_q, TRUE);
1.60 kml 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);
1.114.4.10! itojun 1749: if (error == 0)
! 1750: rt_timer_queue_change(ip_mtudisc_timeout_q,
1.60 kml 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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