Annotation of src/sys/netinet/ip_input.c, Revision 1.119
1.119 ! itojun 1: /* $NetBSD: ip_input.c,v 1.118 2000/08/26 10:41:29 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:
1.115 mrg 123: #include <uvm/uvm_extern.h>
124:
1.28 christos 125: #include <sys/sysctl.h>
1.1 cgd 126:
1.5 mycroft 127: #include <net/if.h>
1.44 thorpej 128: #include <net/if_dl.h>
1.5 mycroft 129: #include <net/route.h>
1.45 mrg 130: #include <net/pfil.h>
1.1 cgd 131:
1.5 mycroft 132: #include <netinet/in.h>
133: #include <netinet/in_systm.h>
134: #include <netinet/ip.h>
135: #include <netinet/in_pcb.h>
136: #include <netinet/in_var.h>
137: #include <netinet/ip_var.h>
138: #include <netinet/ip_icmp.h>
1.89 itojun 139: /* just for gif_ttl */
140: #include <netinet/in_gif.h>
141: #include "gif.h"
1.111 jdolecek 142:
143: #ifdef MROUTING
144: #include <netinet/ip_mroute.h>
145: #endif
1.89 itojun 146:
147: #ifdef IPSEC
148: #include <netinet6/ipsec.h>
149: #include <netkey/key.h>
150: #endif
1.44 thorpej 151:
1.1 cgd 152: #ifndef IPFORWARDING
153: #ifdef GATEWAY
154: #define IPFORWARDING 1 /* forward IP packets not for us */
155: #else /* GATEWAY */
156: #define IPFORWARDING 0 /* don't forward IP packets not for us */
157: #endif /* GATEWAY */
158: #endif /* IPFORWARDING */
159: #ifndef IPSENDREDIRECTS
160: #define IPSENDREDIRECTS 1
161: #endif
1.26 thorpej 162: #ifndef IPFORWSRCRT
1.47 cjs 163: #define IPFORWSRCRT 1 /* forward source-routed packets */
164: #endif
165: #ifndef IPALLOWSRCRT
1.48 mrg 166: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 167: #endif
1.53 kml 168: #ifndef IPMTUDISC
169: #define IPMTUDISC 0
170: #endif
1.60 kml 171: #ifndef IPMTUDISCTIMEOUT
1.61 kml 172: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 173: #endif
1.53 kml 174:
1.27 thorpej 175: /*
176: * Note: DIRECTED_BROADCAST is handled this way so that previous
177: * configuration using this option will Just Work.
178: */
179: #ifndef IPDIRECTEDBCAST
180: #ifdef DIRECTED_BROADCAST
181: #define IPDIRECTEDBCAST 1
182: #else
183: #define IPDIRECTEDBCAST 0
184: #endif /* DIRECTED_BROADCAST */
185: #endif /* IPDIRECTEDBCAST */
1.1 cgd 186: int ipforwarding = IPFORWARDING;
187: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 188: int ip_defttl = IPDEFTTL;
1.26 thorpej 189: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 190: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 191: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 192: int ip_mtudisc = IPMTUDISC;
1.60 kml 193: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
197:
1.60 kml 198: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
199:
1.1 cgd 200: extern struct domain inetdomain;
201: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 202: struct in_ifaddrhead in_ifaddr;
1.57 tls 203: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 204: struct ifqueue ipintrq;
1.63 matt 205: struct ipstat ipstat;
206: u_int16_t ip_id;
1.75 thorpej 207:
1.63 matt 208: struct ipqhead ipq;
1.75 thorpej 209: int ipq_locked;
210:
211: static __inline int ipq_lock_try __P((void));
212: static __inline void ipq_unlock __P((void));
213:
214: static __inline int
215: ipq_lock_try()
216: {
217: int s;
218:
219: s = splimp();
220: if (ipq_locked) {
221: splx(s);
222: return (0);
223: }
224: ipq_locked = 1;
225: splx(s);
226: return (1);
227: }
228:
229: static __inline void
230: ipq_unlock()
231: {
232: int s;
233:
234: s = splimp();
235: ipq_locked = 0;
236: splx(s);
237: }
238:
239: #ifdef DIAGNOSTIC
240: #define IPQ_LOCK() \
241: do { \
242: if (ipq_lock_try() == 0) { \
243: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
244: panic("ipq_lock"); \
245: } \
246: } while (0)
247: #define IPQ_LOCK_CHECK() \
248: do { \
249: if (ipq_locked == 0) { \
250: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
251: panic("ipq lock check"); \
252: } \
253: } while (0)
254: #else
255: #define IPQ_LOCK() (void) ipq_lock_try()
256: #define IPQ_LOCK_CHECK() /* nothing */
257: #endif
258:
259: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 260:
1.72 thorpej 261: struct pool ipqent_pool;
262:
1.1 cgd 263: /*
264: * We need to save the IP options in case a protocol wants to respond
265: * to an incoming packet over the same route if the packet got here
266: * using IP source routing. This allows connection establishment and
267: * maintenance when the remote end is on a network that is not known
268: * to us.
269: */
270: int ip_nhops = 0;
271: static struct ip_srcrt {
272: struct in_addr dst; /* final destination */
273: char nop; /* one NOP to align */
274: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
275: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
276: } ip_srcrt;
277:
1.13 mycroft 278: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 279:
1.1 cgd 280: /*
281: * IP initialization: fill in IP protocol switch table.
282: * All protocols not implemented in kernel go to raw IP protocol handler.
283: */
1.8 mycroft 284: void
1.1 cgd 285: ip_init()
286: {
1.109 augustss 287: struct protosw *pr;
288: int i;
1.1 cgd 289:
1.72 thorpej 290: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
291: 0, NULL, NULL, M_IPQ);
292:
1.1 cgd 293: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
294: if (pr == 0)
295: panic("ip_init");
296: for (i = 0; i < IPPROTO_MAX; i++)
297: ip_protox[i] = pr - inetsw;
298: for (pr = inetdomain.dom_protosw;
299: pr < inetdomain.dom_protoswNPROTOSW; pr++)
300: if (pr->pr_domain->dom_family == PF_INET &&
301: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
302: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 303: LIST_INIT(&ipq);
1.1 cgd 304: ip_id = time.tv_sec & 0xffff;
305: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 306: TAILQ_INIT(&in_ifaddr);
1.57 tls 307: in_ifaddrhashtbl =
308: hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60 kml 309: if (ip_mtudisc != 0)
310: ip_mtudisc_timeout_q =
311: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 312: #ifdef GATEWAY
313: ipflow_init();
314: #endif
1.1 cgd 315: }
316:
317: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
318: struct route ipforward_rt;
319:
320: /*
1.89 itojun 321: * IP software interrupt routine
322: */
323: void
324: ipintr()
325: {
326: int s;
327: struct mbuf *m;
328:
329: while (1) {
330: s = splimp();
331: IF_DEQUEUE(&ipintrq, m);
332: splx(s);
333: if (m == 0)
334: return;
335: ip_input(m);
336: }
337: }
338:
339: /*
1.1 cgd 340: * Ip input routine. Checksum and byte swap header. If fragmented
341: * try to reassemble. Process options. Pass to next level.
342: */
1.8 mycroft 343: void
1.89 itojun 344: ip_input(struct mbuf *m)
1.1 cgd 345: {
1.109 augustss 346: struct ip *ip = NULL;
347: struct ipq *fp;
348: struct in_ifaddr *ia;
349: struct ifaddr *ifa;
1.25 cgd 350: struct ipqent *ipqe;
1.89 itojun 351: int hlen = 0, mff, len;
1.100 itojun 352: int downmatch;
1.36 mrg 353: #ifdef PFIL_HOOKS
1.33 mrg 354: struct packet_filter_hook *pfh;
355: struct mbuf *m0;
1.43 mrg 356: int rv;
1.36 mrg 357: #endif /* PFIL_HOOKS */
1.1 cgd 358:
359: #ifdef DIAGNOSTIC
360: if ((m->m_flags & M_PKTHDR) == 0)
361: panic("ipintr no HDR");
362: #endif
1.89 itojun 363: #ifdef IPSEC
364: /*
365: * should the inner packet be considered authentic?
366: * see comment in ah4_input().
367: */
368: if (m) {
369: m->m_flags &= ~M_AUTHIPHDR;
370: m->m_flags &= ~M_AUTHIPDGM;
371: }
372: #endif
1.1 cgd 373: /*
374: * If no IP addresses have been set yet but the interfaces
375: * are receiving, can't do anything with incoming packets yet.
376: */
1.22 mycroft 377: if (in_ifaddr.tqh_first == 0)
1.1 cgd 378: goto bad;
379: ipstat.ips_total++;
380: if (m->m_len < sizeof (struct ip) &&
381: (m = m_pullup(m, sizeof (struct ip))) == 0) {
382: ipstat.ips_toosmall++;
1.89 itojun 383: return;
1.1 cgd 384: }
385: ip = mtod(m, struct ip *);
1.13 mycroft 386: if (ip->ip_v != IPVERSION) {
387: ipstat.ips_badvers++;
388: goto bad;
389: }
1.1 cgd 390: hlen = ip->ip_hl << 2;
391: if (hlen < sizeof(struct ip)) { /* minimum header length */
392: ipstat.ips_badhlen++;
393: goto bad;
394: }
395: if (hlen > m->m_len) {
396: if ((m = m_pullup(m, hlen)) == 0) {
397: ipstat.ips_badhlen++;
1.89 itojun 398: return;
1.1 cgd 399: }
400: ip = mtod(m, struct ip *);
401: }
1.98 thorpej 402:
1.85 hwr 403: /*
1.99 thorpej 404: * RFC1122: packets with a multicast source address are
1.98 thorpej 405: * not allowed.
1.85 hwr 406: */
407: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 408: /* XXX stat */
1.85 hwr 409: goto bad;
410: }
411:
1.78 mycroft 412: if (in_cksum(m, hlen) != 0) {
1.1 cgd 413: ipstat.ips_badsum++;
414: goto bad;
415: }
416:
417: /*
418: * Convert fields to host representation.
419: */
420: NTOHS(ip->ip_len);
421: NTOHS(ip->ip_off);
1.35 mycroft 422: len = ip->ip_len;
1.81 proff 423:
424: /*
425: * Check for additional length bogosity
426: */
1.84 proff 427: if (len < hlen) {
1.81 proff 428: ipstat.ips_badlen++;
429: goto bad;
430: }
1.1 cgd 431:
432: /*
433: * Check that the amount of data in the buffers
434: * is as at least much as the IP header would have us expect.
435: * Trim mbufs if longer than we expect.
436: * Drop packet if shorter than we expect.
437: */
1.35 mycroft 438: if (m->m_pkthdr.len < len) {
1.1 cgd 439: ipstat.ips_tooshort++;
440: goto bad;
441: }
1.35 mycroft 442: if (m->m_pkthdr.len > len) {
1.1 cgd 443: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 444: m->m_len = len;
445: m->m_pkthdr.len = len;
1.1 cgd 446: } else
1.35 mycroft 447: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 448: }
449:
1.94 itojun 450: #ifdef IPSEC
451: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
452: m->m_flags &= ~M_CANFASTFWD;
453: #else
1.64 thorpej 454: /*
455: * Assume that we can create a fast-forward IP flow entry
456: * based on this packet.
457: */
458: m->m_flags |= M_CANFASTFWD;
1.94 itojun 459: #endif
1.64 thorpej 460:
1.36 mrg 461: #ifdef PFIL_HOOKS
1.33 mrg 462: /*
1.64 thorpej 463: * Run through list of hooks for input packets. If there are any
464: * filters which require that additional packets in the flow are
465: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
466: * Note that filters must _never_ set this flag, as another filter
467: * in the list may have previously cleared it.
1.33 mrg 468: */
469: m0 = m;
1.102 darrenr 470: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 471: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 472: if (pfh->pfil_func) {
1.101 darrenr 473: rv = pfh->pfil_func(ip, hlen,
474: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 475: if (rv)
1.89 itojun 476: return;
1.68 sommerfe 477: m = m0;
478: if (m == NULL)
1.89 itojun 479: return;
1.68 sommerfe 480: ip = mtod(m, struct ip *);
1.33 mrg 481: }
1.36 mrg 482: #endif /* PFIL_HOOKS */
1.33 mrg 483:
1.1 cgd 484: /*
485: * Process options and, if not destined for us,
486: * ship it on. ip_dooptions returns 1 when an
487: * error was detected (causing an icmp message
488: * to be sent and the original packet to be freed).
489: */
490: ip_nhops = 0; /* for source routed packets */
491: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 492: return;
1.1 cgd 493:
494: /*
495: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 496: *
497: * Traditional 4.4BSD did not consult IFF_UP at all.
498: * The behavior here is to treat addresses on !IFF_UP interface
499: * as not mine.
1.1 cgd 500: */
1.100 itojun 501: downmatch = 0;
1.97 itojun 502: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
503: ia != NULL;
504: ia = ia->ia_hash.le_next) {
505: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
506: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
507: break;
1.100 itojun 508: else
509: downmatch++;
1.97 itojun 510: }
511: }
1.86 thorpej 512: if (ia != NULL)
513: goto ours;
1.57 tls 514: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
515: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
516: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
517: if (ifa->ifa_addr->sa_family != AF_INET) continue;
518: ia = ifatoia(ifa);
1.35 mycroft 519: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
520: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 521: /*
522: * Look for all-0's host part (old broadcast addr),
523: * either for subnet or net.
524: */
525: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 526: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 527: goto ours;
1.57 tls 528: /*
529: * An interface with IP address zero accepts
530: * all packets that arrive on that interface.
531: */
532: if (in_nullhost(ia->ia_addr.sin_addr))
533: goto ours;
1.1 cgd 534: }
535: }
1.18 mycroft 536: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 537: struct in_multi *inm;
538: #ifdef MROUTING
539: extern struct socket *ip_mrouter;
1.10 brezak 540:
541: if (m->m_flags & M_EXT) {
542: if ((m = m_pullup(m, hlen)) == 0) {
543: ipstat.ips_toosmall++;
1.89 itojun 544: return;
1.10 brezak 545: }
546: ip = mtod(m, struct ip *);
547: }
1.4 hpeyerl 548:
549: if (ip_mrouter) {
550: /*
551: * If we are acting as a multicast router, all
552: * incoming multicast packets are passed to the
553: * kernel-level multicast forwarding function.
554: * The packet is returned (relatively) intact; if
555: * ip_mforward() returns a non-zero value, the packet
556: * must be discarded, else it may be accepted below.
557: *
558: * (The IP ident field is put in the same byte order
559: * as expected when ip_mforward() is called from
560: * ip_output().)
561: */
1.13 mycroft 562: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
563: ipstat.ips_cantforward++;
1.4 hpeyerl 564: m_freem(m);
1.89 itojun 565: return;
1.4 hpeyerl 566: }
567:
568: /*
569: * The process-level routing demon needs to receive
570: * all multicast IGMP packets, whether or not this
571: * host belongs to their destination groups.
572: */
573: if (ip->ip_p == IPPROTO_IGMP)
574: goto ours;
1.13 mycroft 575: ipstat.ips_forward++;
1.4 hpeyerl 576: }
577: #endif
578: /*
579: * See if we belong to the destination multicast group on the
580: * arrival interface.
581: */
582: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
583: if (inm == NULL) {
1.13 mycroft 584: ipstat.ips_cantforward++;
1.4 hpeyerl 585: m_freem(m);
1.89 itojun 586: return;
1.4 hpeyerl 587: }
588: goto ours;
589: }
1.19 mycroft 590: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 591: in_nullhost(ip->ip_dst))
1.1 cgd 592: goto ours;
593:
594: /*
595: * Not for us; forward if possible and desirable.
596: */
597: if (ipforwarding == 0) {
598: ipstat.ips_cantforward++;
599: m_freem(m);
1.100 itojun 600: } else {
601: /*
602: * If ip_dst matched any of my address on !IFF_UP interface,
603: * and there's no IFF_UP interface that matches ip_dst,
604: * send icmp unreach. Forwarding it will result in in-kernel
605: * forwarding loop till TTL goes to 0.
606: */
607: if (downmatch) {
608: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
609: ipstat.ips_cantforward++;
610: return;
611: }
1.1 cgd 612: ip_forward(m, 0);
1.100 itojun 613: }
1.89 itojun 614: return;
1.1 cgd 615:
616: ours:
617: /*
618: * If offset or IP_MF are set, must reassemble.
619: * Otherwise, nothing need be done.
620: * (We could look in the reassembly queue to see
621: * if the packet was previously fragmented,
622: * but it's not worth the time; just let them time out.)
623: */
1.37 perry 624: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 625: /*
626: * Look for queue of fragments
627: * of this datagram.
628: */
1.75 thorpej 629: IPQ_LOCK();
1.25 cgd 630: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 631: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 632: in_hosteq(ip->ip_src, fp->ipq_src) &&
633: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 634: ip->ip_p == fp->ipq_p)
635: goto found;
636: fp = 0;
637: found:
638:
639: /*
640: * Adjust ip_len to not reflect header,
1.25 cgd 641: * set ipqe_mff if more fragments are expected,
1.1 cgd 642: * convert offset of this to bytes.
643: */
644: ip->ip_len -= hlen;
1.25 cgd 645: mff = (ip->ip_off & IP_MF) != 0;
646: if (mff) {
1.16 cgd 647: /*
648: * Make sure that fragments have a data length
649: * that's a non-zero multiple of 8 bytes.
650: */
1.17 cgd 651: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 652: ipstat.ips_badfrags++;
1.75 thorpej 653: IPQ_UNLOCK();
1.16 cgd 654: goto bad;
655: }
656: }
1.1 cgd 657: ip->ip_off <<= 3;
658:
659: /*
660: * If datagram marked as having more fragments
661: * or if this is not the first fragment,
662: * attempt reassembly; if it succeeds, proceed.
663: */
1.25 cgd 664: if (mff || ip->ip_off) {
1.1 cgd 665: ipstat.ips_fragments++;
1.72 thorpej 666: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 667: if (ipqe == NULL) {
668: ipstat.ips_rcvmemdrop++;
1.75 thorpej 669: IPQ_UNLOCK();
1.25 cgd 670: goto bad;
671: }
672: ipqe->ipqe_mff = mff;
1.50 thorpej 673: ipqe->ipqe_m = m;
1.25 cgd 674: ipqe->ipqe_ip = ip;
1.50 thorpej 675: m = ip_reass(ipqe, fp);
1.75 thorpej 676: if (m == 0) {
677: IPQ_UNLOCK();
1.89 itojun 678: return;
1.75 thorpej 679: }
1.13 mycroft 680: ipstat.ips_reassembled++;
1.50 thorpej 681: ip = mtod(m, struct ip *);
1.74 thorpej 682: hlen = ip->ip_hl << 2;
1.79 mycroft 683: ip->ip_len += hlen;
1.1 cgd 684: } else
685: if (fp)
686: ip_freef(fp);
1.75 thorpej 687: IPQ_UNLOCK();
1.79 mycroft 688: }
1.1 cgd 689:
690: /*
691: * Switch out to protocol's input routine.
692: */
1.82 aidan 693: #if IFA_STATS
694: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
695: #endif
1.1 cgd 696: ipstat.ips_delivered++;
1.89 itojun 697: {
698: int off = hlen, nh = ip->ip_p;
699:
700: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
701: return;
702: }
1.1 cgd 703: bad:
704: m_freem(m);
705: }
706:
707: /*
708: * Take incoming datagram fragment and try to
709: * reassemble it into whole datagram. If a chain for
710: * reassembly of this datagram already exists, then it
711: * is given as fp; otherwise have to make a chain.
712: */
1.50 thorpej 713: struct mbuf *
1.25 cgd 714: ip_reass(ipqe, fp)
1.109 augustss 715: struct ipqent *ipqe;
716: struct ipq *fp;
1.1 cgd 717: {
1.109 augustss 718: struct mbuf *m = ipqe->ipqe_m;
719: struct ipqent *nq, *p, *q;
1.25 cgd 720: struct ip *ip;
1.1 cgd 721: struct mbuf *t;
1.25 cgd 722: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 723: int i, next;
724:
1.75 thorpej 725: IPQ_LOCK_CHECK();
726:
1.1 cgd 727: /*
728: * Presence of header sizes in mbufs
729: * would confuse code below.
730: */
731: m->m_data += hlen;
732: m->m_len -= hlen;
733:
734: /*
735: * If first fragment to arrive, create a reassembly queue.
736: */
737: if (fp == 0) {
1.50 thorpej 738: MALLOC(fp, struct ipq *, sizeof (struct ipq),
739: M_FTABLE, M_NOWAIT);
740: if (fp == NULL)
1.1 cgd 741: goto dropfrag;
1.25 cgd 742: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 743: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 744: fp->ipq_p = ipqe->ipqe_ip->ip_p;
745: fp->ipq_id = ipqe->ipqe_ip->ip_id;
746: LIST_INIT(&fp->ipq_fragq);
747: fp->ipq_src = ipqe->ipqe_ip->ip_src;
748: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
749: p = NULL;
1.1 cgd 750: goto insert;
751: }
752:
753: /*
754: * Find a segment which begins after this one does.
755: */
1.25 cgd 756: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
757: p = q, q = q->ipqe_q.le_next)
758: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 759: break;
760:
761: /*
762: * If there is a preceding segment, it may provide some of
763: * our data already. If so, drop the data from the incoming
764: * segment. If it provides all of our data, drop us.
765: */
1.25 cgd 766: if (p != NULL) {
767: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
768: ipqe->ipqe_ip->ip_off;
1.1 cgd 769: if (i > 0) {
1.25 cgd 770: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 771: goto dropfrag;
1.50 thorpej 772: m_adj(ipqe->ipqe_m, i);
1.25 cgd 773: ipqe->ipqe_ip->ip_off += i;
774: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 775: }
776: }
777:
778: /*
779: * While we overlap succeeding segments trim them or,
780: * if they are completely covered, dequeue them.
781: */
1.25 cgd 782: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
783: q->ipqe_ip->ip_off; q = nq) {
784: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
785: q->ipqe_ip->ip_off;
786: if (i < q->ipqe_ip->ip_len) {
787: q->ipqe_ip->ip_len -= i;
788: q->ipqe_ip->ip_off += i;
1.50 thorpej 789: m_adj(q->ipqe_m, i);
1.1 cgd 790: break;
791: }
1.25 cgd 792: nq = q->ipqe_q.le_next;
1.50 thorpej 793: m_freem(q->ipqe_m);
1.25 cgd 794: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 795: pool_put(&ipqent_pool, q);
1.1 cgd 796: }
797:
798: insert:
799: /*
800: * Stick new segment in its place;
801: * check for complete reassembly.
802: */
1.25 cgd 803: if (p == NULL) {
804: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
805: } else {
806: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
807: }
1.1 cgd 808: next = 0;
1.25 cgd 809: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
810: p = q, q = q->ipqe_q.le_next) {
811: if (q->ipqe_ip->ip_off != next)
1.1 cgd 812: return (0);
1.25 cgd 813: next += q->ipqe_ip->ip_len;
1.1 cgd 814: }
1.25 cgd 815: if (p->ipqe_mff)
1.1 cgd 816: return (0);
817:
818: /*
1.41 thorpej 819: * Reassembly is complete. Check for a bogus message size and
820: * concatenate fragments.
1.1 cgd 821: */
1.25 cgd 822: q = fp->ipq_fragq.lh_first;
823: ip = q->ipqe_ip;
1.41 thorpej 824: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
825: ipstat.ips_toolong++;
826: ip_freef(fp);
827: return (0);
828: }
1.50 thorpej 829: m = q->ipqe_m;
1.1 cgd 830: t = m->m_next;
831: m->m_next = 0;
832: m_cat(m, t);
1.25 cgd 833: nq = q->ipqe_q.le_next;
1.72 thorpej 834: pool_put(&ipqent_pool, q);
1.25 cgd 835: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 836: t = q->ipqe_m;
1.25 cgd 837: nq = q->ipqe_q.le_next;
1.72 thorpej 838: pool_put(&ipqent_pool, q);
1.1 cgd 839: m_cat(m, t);
840: }
841:
842: /*
843: * Create header for new ip packet by
844: * modifying header of first packet;
845: * dequeue and discard fragment reassembly header.
846: * Make header visible.
847: */
848: ip->ip_len = next;
1.25 cgd 849: ip->ip_src = fp->ipq_src;
850: ip->ip_dst = fp->ipq_dst;
851: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 852: FREE(fp, M_FTABLE);
1.1 cgd 853: m->m_len += (ip->ip_hl << 2);
854: m->m_data -= (ip->ip_hl << 2);
855: /* some debugging cruft by sklower, below, will go away soon */
856: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 857: int plen = 0;
1.50 thorpej 858: for (t = m; t; t = t->m_next)
859: plen += t->m_len;
860: m->m_pkthdr.len = plen;
1.1 cgd 861: }
1.50 thorpej 862: return (m);
1.1 cgd 863:
864: dropfrag:
865: ipstat.ips_fragdropped++;
866: m_freem(m);
1.72 thorpej 867: pool_put(&ipqent_pool, ipqe);
1.1 cgd 868: return (0);
869: }
870:
871: /*
872: * Free a fragment reassembly header and all
873: * associated datagrams.
874: */
1.8 mycroft 875: void
1.1 cgd 876: ip_freef(fp)
877: struct ipq *fp;
878: {
1.109 augustss 879: struct ipqent *q, *p;
1.1 cgd 880:
1.75 thorpej 881: IPQ_LOCK_CHECK();
882:
1.25 cgd 883: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
884: p = q->ipqe_q.le_next;
1.50 thorpej 885: m_freem(q->ipqe_m);
1.25 cgd 886: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 887: pool_put(&ipqent_pool, q);
1.1 cgd 888: }
1.25 cgd 889: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 890: FREE(fp, M_FTABLE);
1.1 cgd 891: }
892:
893: /*
894: * IP timer processing;
895: * if a timer expires on a reassembly
896: * queue, discard it.
897: */
1.8 mycroft 898: void
1.1 cgd 899: ip_slowtimo()
900: {
1.109 augustss 901: struct ipq *fp, *nfp;
1.24 mycroft 902: int s = splsoftnet();
1.1 cgd 903:
1.75 thorpej 904: IPQ_LOCK();
1.25 cgd 905: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
906: nfp = fp->ipq_q.le_next;
907: if (--fp->ipq_ttl == 0) {
1.1 cgd 908: ipstat.ips_fragtimeout++;
1.25 cgd 909: ip_freef(fp);
1.1 cgd 910: }
911: }
1.75 thorpej 912: IPQ_UNLOCK();
1.63 matt 913: #ifdef GATEWAY
914: ipflow_slowtimo();
915: #endif
1.1 cgd 916: splx(s);
917: }
918:
919: /*
920: * Drain off all datagram fragments.
921: */
1.8 mycroft 922: void
1.1 cgd 923: ip_drain()
924: {
925:
1.75 thorpej 926: /*
927: * We may be called from a device's interrupt context. If
928: * the ipq is already busy, just bail out now.
929: */
930: if (ipq_lock_try() == 0)
931: return;
932:
1.25 cgd 933: while (ipq.lh_first != NULL) {
1.1 cgd 934: ipstat.ips_fragdropped++;
1.25 cgd 935: ip_freef(ipq.lh_first);
1.1 cgd 936: }
1.75 thorpej 937:
938: IPQ_UNLOCK();
1.1 cgd 939: }
940:
941: /*
942: * Do option processing on a datagram,
943: * possibly discarding it if bad options are encountered,
944: * or forwarding it if source-routed.
945: * Returns 1 if packet has been forwarded/freed,
946: * 0 if the packet should be processed further.
947: */
1.8 mycroft 948: int
1.1 cgd 949: ip_dooptions(m)
950: struct mbuf *m;
951: {
1.109 augustss 952: struct ip *ip = mtod(m, struct ip *);
953: u_char *cp, *cp0;
954: struct ip_timestamp *ipt;
955: struct in_ifaddr *ia;
1.1 cgd 956: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 957: struct in_addr dst;
1.1 cgd 958: n_time ntime;
959:
1.13 mycroft 960: dst = ip->ip_dst;
1.1 cgd 961: cp = (u_char *)(ip + 1);
962: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
963: for (; cnt > 0; cnt -= optlen, cp += optlen) {
964: opt = cp[IPOPT_OPTVAL];
965: if (opt == IPOPT_EOL)
966: break;
967: if (opt == IPOPT_NOP)
968: optlen = 1;
969: else {
1.113 itojun 970: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
971: code = &cp[IPOPT_OLEN] - (u_char *)ip;
972: goto bad;
973: }
1.1 cgd 974: optlen = cp[IPOPT_OLEN];
1.114 itojun 975: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 976: code = &cp[IPOPT_OLEN] - (u_char *)ip;
977: goto bad;
978: }
979: }
980: switch (opt) {
981:
982: default:
983: break;
984:
985: /*
986: * Source routing with record.
987: * Find interface with current destination address.
988: * If none on this machine then drop if strictly routed,
989: * or do nothing if loosely routed.
990: * Record interface address and bring up next address
991: * component. If strictly routed make sure next
992: * address is on directly accessible net.
993: */
994: case IPOPT_LSRR:
995: case IPOPT_SSRR:
1.47 cjs 996: if (ip_allowsrcrt == 0) {
997: type = ICMP_UNREACH;
998: code = ICMP_UNREACH_NET_PROHIB;
999: goto bad;
1000: }
1.114 itojun 1001: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1002: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1003: goto bad;
1004: }
1.1 cgd 1005: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1006: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1007: goto bad;
1008: }
1009: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1010: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1011: if (ia == 0) {
1012: if (opt == IPOPT_SSRR) {
1013: type = ICMP_UNREACH;
1014: code = ICMP_UNREACH_SRCFAIL;
1015: goto bad;
1016: }
1017: /*
1018: * Loose routing, and not at next destination
1019: * yet; nothing to do except forward.
1020: */
1021: break;
1022: }
1023: off--; /* 0 origin */
1.112 sommerfe 1024: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1025: /*
1026: * End of source route. Should be for us.
1027: */
1028: save_rte(cp, ip->ip_src);
1029: break;
1030: }
1031: /*
1032: * locate outgoing interface
1033: */
1034: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1035: sizeof(ipaddr.sin_addr));
1.96 thorpej 1036: if (opt == IPOPT_SSRR)
1037: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1038: else
1.1 cgd 1039: ia = ip_rtaddr(ipaddr.sin_addr);
1040: if (ia == 0) {
1041: type = ICMP_UNREACH;
1042: code = ICMP_UNREACH_SRCFAIL;
1043: goto bad;
1044: }
1045: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1046: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1047: (caddr_t)(cp + off), sizeof(struct in_addr));
1048: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1049: /*
1050: * Let ip_intr's mcast routing check handle mcast pkts
1051: */
1.18 mycroft 1052: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1053: break;
1054:
1055: case IPOPT_RR:
1.114 itojun 1056: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1057: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1058: goto bad;
1059: }
1.1 cgd 1060: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1061: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1062: goto bad;
1063: }
1064: /*
1065: * If no space remains, ignore.
1066: */
1067: off--; /* 0 origin */
1.112 sommerfe 1068: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1069: break;
1070: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1071: sizeof(ipaddr.sin_addr));
1072: /*
1073: * locate outgoing interface; if we're the destination,
1074: * use the incoming interface (should be same).
1075: */
1.96 thorpej 1076: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1077: == NULL &&
1078: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1079: type = ICMP_UNREACH;
1080: code = ICMP_UNREACH_HOST;
1081: goto bad;
1082: }
1.20 mycroft 1083: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1084: (caddr_t)(cp + off), sizeof(struct in_addr));
1085: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1086: break;
1087:
1088: case IPOPT_TS:
1089: code = cp - (u_char *)ip;
1090: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1091: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1092: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1093: goto bad;
1.114 itojun 1094: }
1095: if (ipt->ipt_ptr < 5) {
1096: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1097: goto bad;
1098: }
1.15 cgd 1099: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1100: if (++ipt->ipt_oflw == 0) {
1101: code = (u_char *)&ipt->ipt_ptr -
1102: (u_char *)ip;
1.1 cgd 1103: goto bad;
1.114 itojun 1104: }
1.1 cgd 1105: break;
1106: }
1.104 thorpej 1107: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1108: switch (ipt->ipt_flg) {
1109:
1110: case IPOPT_TS_TSONLY:
1111: break;
1112:
1113: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1114: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1115: sizeof(struct in_addr) > ipt->ipt_len) {
1116: code = (u_char *)&ipt->ipt_ptr -
1117: (u_char *)ip;
1.1 cgd 1118: goto bad;
1.114 itojun 1119: }
1.13 mycroft 1120: ipaddr.sin_addr = dst;
1.96 thorpej 1121: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1122: m->m_pkthdr.rcvif));
1.13 mycroft 1123: if (ia == 0)
1124: continue;
1.104 thorpej 1125: bcopy(&ia->ia_addr.sin_addr,
1126: cp0, sizeof(struct in_addr));
1.1 cgd 1127: ipt->ipt_ptr += sizeof(struct in_addr);
1128: break;
1129:
1130: case IPOPT_TS_PRESPEC:
1.66 thorpej 1131: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1132: sizeof(struct in_addr) > ipt->ipt_len) {
1133: code = (u_char *)&ipt->ipt_ptr -
1134: (u_char *)ip;
1.1 cgd 1135: goto bad;
1.114 itojun 1136: }
1.104 thorpej 1137: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1138: sizeof(struct in_addr));
1.96 thorpej 1139: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1140: == NULL)
1.1 cgd 1141: continue;
1142: ipt->ipt_ptr += sizeof(struct in_addr);
1143: break;
1144:
1145: default:
1.114 itojun 1146: /* XXX can't take &ipt->ipt_flg */
1147: code = (u_char *)&ipt->ipt_ptr -
1148: (u_char *)ip + 1;
1.1 cgd 1149: goto bad;
1150: }
1151: ntime = iptime();
1.107 thorpej 1152: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1153: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1154: sizeof(n_time));
1155: ipt->ipt_ptr += sizeof(n_time);
1156: }
1157: }
1158: if (forward) {
1.26 thorpej 1159: if (ip_forwsrcrt == 0) {
1160: type = ICMP_UNREACH;
1161: code = ICMP_UNREACH_SRCFAIL;
1162: goto bad;
1163: }
1.1 cgd 1164: ip_forward(m, 1);
1165: return (1);
1.13 mycroft 1166: }
1167: return (0);
1.1 cgd 1168: bad:
1.13 mycroft 1169: icmp_error(m, type, code, 0, 0);
1170: ipstat.ips_badoptions++;
1.1 cgd 1171: return (1);
1172: }
1173:
1174: /*
1175: * Given address of next destination (final or next hop),
1176: * return internet address info of interface to be used to get there.
1177: */
1178: struct in_ifaddr *
1179: ip_rtaddr(dst)
1180: struct in_addr dst;
1181: {
1.109 augustss 1182: struct sockaddr_in *sin;
1.1 cgd 1183:
1.19 mycroft 1184: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1185:
1.35 mycroft 1186: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1187: if (ipforward_rt.ro_rt) {
1188: RTFREE(ipforward_rt.ro_rt);
1189: ipforward_rt.ro_rt = 0;
1190: }
1191: sin->sin_family = AF_INET;
1192: sin->sin_len = sizeof(*sin);
1193: sin->sin_addr = dst;
1194:
1195: rtalloc(&ipforward_rt);
1196: }
1197: if (ipforward_rt.ro_rt == 0)
1198: return ((struct in_ifaddr *)0);
1.19 mycroft 1199: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1200: }
1201:
1202: /*
1203: * Save incoming source route for use in replies,
1204: * to be picked up later by ip_srcroute if the receiver is interested.
1205: */
1.13 mycroft 1206: void
1.1 cgd 1207: save_rte(option, dst)
1208: u_char *option;
1209: struct in_addr dst;
1210: {
1211: unsigned olen;
1212:
1213: olen = option[IPOPT_OLEN];
1214: #ifdef DIAGNOSTIC
1215: if (ipprintfs)
1.39 christos 1216: printf("save_rte: olen %d\n", olen);
1.89 itojun 1217: #endif /* 0 */
1.1 cgd 1218: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1219: return;
1220: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1221: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1222: ip_srcrt.dst = dst;
1223: }
1224:
1225: /*
1226: * Retrieve incoming source route for use in replies,
1227: * in the same form used by setsockopt.
1228: * The first hop is placed before the options, will be removed later.
1229: */
1230: struct mbuf *
1231: ip_srcroute()
1232: {
1.109 augustss 1233: struct in_addr *p, *q;
1234: struct mbuf *m;
1.1 cgd 1235:
1236: if (ip_nhops == 0)
1237: return ((struct mbuf *)0);
1238: m = m_get(M_DONTWAIT, MT_SOOPTS);
1239: if (m == 0)
1240: return ((struct mbuf *)0);
1241:
1.13 mycroft 1242: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1243:
1244: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1245: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1246: OPTSIZ;
1247: #ifdef DIAGNOSTIC
1248: if (ipprintfs)
1.39 christos 1249: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1250: #endif
1251:
1252: /*
1253: * First save first hop for return route
1254: */
1255: p = &ip_srcrt.route[ip_nhops - 1];
1256: *(mtod(m, struct in_addr *)) = *p--;
1257: #ifdef DIAGNOSTIC
1258: if (ipprintfs)
1.39 christos 1259: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1260: #endif
1261:
1262: /*
1263: * Copy option fields and padding (nop) to mbuf.
1264: */
1265: ip_srcrt.nop = IPOPT_NOP;
1266: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1267: bcopy((caddr_t)&ip_srcrt.nop,
1268: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1269: q = (struct in_addr *)(mtod(m, caddr_t) +
1270: sizeof(struct in_addr) + OPTSIZ);
1271: #undef OPTSIZ
1272: /*
1273: * Record return path as an IP source route,
1274: * reversing the path (pointers are now aligned).
1275: */
1276: while (p >= ip_srcrt.route) {
1277: #ifdef DIAGNOSTIC
1278: if (ipprintfs)
1.39 christos 1279: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1280: #endif
1281: *q++ = *p--;
1282: }
1283: /*
1284: * Last hop goes to final destination.
1285: */
1286: *q = ip_srcrt.dst;
1287: #ifdef DIAGNOSTIC
1288: if (ipprintfs)
1.39 christos 1289: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1290: #endif
1291: return (m);
1292: }
1293:
1294: /*
1295: * Strip out IP options, at higher
1296: * level protocol in the kernel.
1297: * Second argument is buffer to which options
1298: * will be moved, and return value is their length.
1299: * XXX should be deleted; last arg currently ignored.
1300: */
1.8 mycroft 1301: void
1.1 cgd 1302: ip_stripoptions(m, mopt)
1.109 augustss 1303: struct mbuf *m;
1.1 cgd 1304: struct mbuf *mopt;
1305: {
1.109 augustss 1306: int i;
1.1 cgd 1307: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1308: caddr_t opts;
1.1 cgd 1309: int olen;
1310:
1.79 mycroft 1311: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1312: opts = (caddr_t)(ip + 1);
1313: i = m->m_len - (sizeof (struct ip) + olen);
1314: bcopy(opts + olen, opts, (unsigned)i);
1315: m->m_len -= olen;
1316: if (m->m_flags & M_PKTHDR)
1317: m->m_pkthdr.len -= olen;
1.79 mycroft 1318: ip->ip_len -= olen;
1319: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1320: }
1321:
1.23 mycroft 1322: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1323: 0, 0, 0, 0,
1324: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1325: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1326: EMSGSIZE, EHOSTUNREACH, 0, 0,
1327: 0, 0, 0, 0,
1328: ENOPROTOOPT
1329: };
1330:
1331: /*
1332: * Forward a packet. If some error occurs return the sender
1333: * an icmp packet. Note we can't always generate a meaningful
1334: * icmp message because icmp doesn't have a large enough repertoire
1335: * of codes and types.
1336: *
1337: * If not forwarding, just drop the packet. This could be confusing
1338: * if ipforwarding was zero but some routing protocol was advancing
1339: * us as a gateway to somewhere. However, we must let the routing
1340: * protocol deal with that.
1341: *
1342: * The srcrt parameter indicates whether the packet is being forwarded
1343: * via a source route.
1344: */
1.13 mycroft 1345: void
1.1 cgd 1346: ip_forward(m, srcrt)
1347: struct mbuf *m;
1348: int srcrt;
1349: {
1.109 augustss 1350: struct ip *ip = mtod(m, struct ip *);
1351: struct sockaddr_in *sin;
1352: struct rtentry *rt;
1.28 christos 1353: int error, type = 0, code = 0;
1.1 cgd 1354: struct mbuf *mcopy;
1.13 mycroft 1355: n_long dest;
1356: struct ifnet *destifp;
1.89 itojun 1357: #ifdef IPSEC
1358: struct ifnet dummyifp;
1359: #endif
1.1 cgd 1360:
1.13 mycroft 1361: dest = 0;
1.1 cgd 1362: #ifdef DIAGNOSTIC
1363: if (ipprintfs)
1.70 thorpej 1364: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1365: ntohl(ip->ip_src.s_addr),
1366: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1367: #endif
1.93 sommerfe 1368: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1369: ipstat.ips_cantforward++;
1370: m_freem(m);
1371: return;
1372: }
1373: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1374: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1375: return;
1376: }
1377: ip->ip_ttl -= IPTTLDEC;
1378:
1.19 mycroft 1379: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1380: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1381: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1382: if (ipforward_rt.ro_rt) {
1383: RTFREE(ipforward_rt.ro_rt);
1384: ipforward_rt.ro_rt = 0;
1385: }
1386: sin->sin_family = AF_INET;
1.35 mycroft 1387: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1388: sin->sin_addr = ip->ip_dst;
1389:
1390: rtalloc(&ipforward_rt);
1391: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1392: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1393: return;
1394: }
1395: rt = ipforward_rt.ro_rt;
1396: }
1397:
1398: /*
1.34 mycroft 1399: * Save at most 68 bytes of the packet in case
1.1 cgd 1400: * we need to generate an ICMP message to the src.
1.119 ! itojun 1401: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1402: */
1.119 ! itojun 1403: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
! 1404: if (mcopy)
! 1405: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1406:
1407: /*
1408: * If forwarding packet using same interface that it came in on,
1409: * perhaps should send a redirect to sender to shortcut a hop.
1410: * Only send redirect if source is sending directly to us,
1411: * and if packet was not source routed (or has any options).
1412: * Also, don't send redirect if forwarding using a default route
1413: * or a route modified by a redirect.
1414: */
1415: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1416: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1417: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1418: ipsendredirects && !srcrt) {
1.19 mycroft 1419: if (rt->rt_ifa &&
1420: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1421: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1422: if (rt->rt_flags & RTF_GATEWAY)
1423: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1424: else
1425: dest = ip->ip_dst.s_addr;
1426: /*
1427: * Router requirements says to only send host
1428: * redirects.
1429: */
1430: type = ICMP_REDIRECT;
1431: code = ICMP_REDIRECT_HOST;
1.1 cgd 1432: #ifdef DIAGNOSTIC
1.77 thorpej 1433: if (ipprintfs)
1434: printf("redirect (%d) to %x\n", code,
1435: (u_int32_t)dest);
1.1 cgd 1436: #endif
1437: }
1438: }
1439:
1.89 itojun 1440: #ifdef IPSEC
1.103 itojun 1441: /* Don't lookup socket in forwading case */
1442: ipsec_setsocket(m, NULL);
1443: #endif
1.27 thorpej 1444: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1445: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1446: if (error)
1447: ipstat.ips_cantforward++;
1448: else {
1449: ipstat.ips_forward++;
1450: if (type)
1451: ipstat.ips_redirectsent++;
1452: else {
1.63 matt 1453: if (mcopy) {
1454: #ifdef GATEWAY
1.64 thorpej 1455: if (mcopy->m_flags & M_CANFASTFWD)
1456: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1457: #endif
1.1 cgd 1458: m_freem(mcopy);
1.63 matt 1459: }
1.1 cgd 1460: return;
1461: }
1462: }
1463: if (mcopy == NULL)
1464: return;
1.13 mycroft 1465: destifp = NULL;
1466:
1.1 cgd 1467: switch (error) {
1468:
1469: case 0: /* forwarded, but need redirect */
1470: /* type, code set above */
1471: break;
1472:
1473: case ENETUNREACH: /* shouldn't happen, checked above */
1474: case EHOSTUNREACH:
1475: case ENETDOWN:
1476: case EHOSTDOWN:
1477: default:
1478: type = ICMP_UNREACH;
1479: code = ICMP_UNREACH_HOST;
1480: break;
1481:
1482: case EMSGSIZE:
1483: type = ICMP_UNREACH;
1484: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1485: #ifndef IPSEC
1.13 mycroft 1486: if (ipforward_rt.ro_rt)
1487: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1488: #else
1489: /*
1490: * If the packet is routed over IPsec tunnel, tell the
1491: * originator the tunnel MTU.
1492: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1493: * XXX quickhack!!!
1494: */
1495: if (ipforward_rt.ro_rt) {
1496: struct secpolicy *sp;
1497: int ipsecerror;
1.95 itojun 1498: size_t ipsechdr;
1.89 itojun 1499: struct route *ro;
1500:
1501: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1502: IPSEC_DIR_OUTBOUND,
1503: IP_FORWARDING,
1504: &ipsecerror);
1.89 itojun 1505:
1506: if (sp == NULL)
1507: destifp = ipforward_rt.ro_rt->rt_ifp;
1508: else {
1509: /* count IPsec header size */
1.95 itojun 1510: ipsechdr = ipsec4_hdrsiz(mcopy,
1511: IPSEC_DIR_OUTBOUND,
1512: NULL);
1.89 itojun 1513:
1514: /*
1515: * find the correct route for outer IPv4
1516: * header, compute tunnel MTU.
1517: *
1518: * XXX BUG ALERT
1519: * The "dummyifp" code relies upon the fact
1520: * that icmp_error() touches only ifp->if_mtu.
1521: */
1522: /*XXX*/
1523: destifp = NULL;
1524: if (sp->req != NULL
1.95 itojun 1525: && sp->req->sav != NULL
1526: && sp->req->sav->sah != NULL) {
1527: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1528: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1529: dummyifp.if_mtu =
1530: ro->ro_rt->rt_ifp->if_mtu;
1531: dummyifp.if_mtu -= ipsechdr;
1532: destifp = &dummyifp;
1533: }
1534: }
1535:
1536: key_freesp(sp);
1537: }
1538: }
1539: #endif /*IPSEC*/
1.1 cgd 1540: ipstat.ips_cantfrag++;
1541: break;
1542:
1543: case ENOBUFS:
1544: type = ICMP_SOURCEQUENCH;
1545: code = 0;
1546: break;
1547: }
1.13 mycroft 1548: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1549: }
1550:
1551: void
1552: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1553: struct inpcb *inp;
1554: struct mbuf **mp;
1555: struct ip *ip;
1556: struct mbuf *m;
1.44 thorpej 1557: {
1558:
1559: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1560: struct timeval tv;
1561:
1562: microtime(&tv);
1563: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1564: SCM_TIMESTAMP, SOL_SOCKET);
1565: if (*mp)
1566: mp = &(*mp)->m_next;
1567: }
1568: if (inp->inp_flags & INP_RECVDSTADDR) {
1569: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1570: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1571: if (*mp)
1572: mp = &(*mp)->m_next;
1573: }
1574: #ifdef notyet
1575: /*
1576: * XXX
1577: * Moving these out of udp_input() made them even more broken
1578: * than they already were.
1579: * - fenner@parc.xerox.com
1580: */
1581: /* options were tossed already */
1582: if (inp->inp_flags & INP_RECVOPTS) {
1583: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1584: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1585: if (*mp)
1586: mp = &(*mp)->m_next;
1587: }
1588: /* ip_srcroute doesn't do what we want here, need to fix */
1589: if (inp->inp_flags & INP_RECVRETOPTS) {
1590: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1591: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1592: if (*mp)
1593: mp = &(*mp)->m_next;
1594: }
1595: #endif
1596: if (inp->inp_flags & INP_RECVIF) {
1597: struct sockaddr_dl sdl;
1598:
1599: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1600: sdl.sdl_family = AF_LINK;
1601: sdl.sdl_index = m->m_pkthdr.rcvif ?
1602: m->m_pkthdr.rcvif->if_index : 0;
1603: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1604: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1605: IP_RECVIF, IPPROTO_IP);
1606: if (*mp)
1607: mp = &(*mp)->m_next;
1608: }
1.13 mycroft 1609: }
1610:
1611: int
1612: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1613: int *name;
1614: u_int namelen;
1615: void *oldp;
1616: size_t *oldlenp;
1617: void *newp;
1618: size_t newlen;
1619: {
1.88 sommerfe 1620: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1621:
1.54 lukem 1622: int error, old;
1623:
1.13 mycroft 1624: /* All sysctl names at this level are terminal. */
1625: if (namelen != 1)
1626: return (ENOTDIR);
1627:
1628: switch (name[0]) {
1629: case IPCTL_FORWARDING:
1630: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1631: case IPCTL_SENDREDIRECTS:
1632: return (sysctl_int(oldp, oldlenp, newp, newlen,
1633: &ipsendredirects));
1634: case IPCTL_DEFTTL:
1635: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1636: #ifdef notyet
1637: case IPCTL_DEFMTU:
1638: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1639: #endif
1.26 thorpej 1640: case IPCTL_FORWSRCRT:
1.47 cjs 1641: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1642: if (securelevel > 0)
1.46 cjs 1643: return (sysctl_rdint(oldp, oldlenp, newp,
1644: ip_forwsrcrt));
1645: else
1646: return (sysctl_int(oldp, oldlenp, newp, newlen,
1647: &ip_forwsrcrt));
1.27 thorpej 1648: case IPCTL_DIRECTEDBCAST:
1649: return (sysctl_int(oldp, oldlenp, newp, newlen,
1650: &ip_directedbcast));
1.47 cjs 1651: case IPCTL_ALLOWSRCRT:
1652: return (sysctl_int(oldp, oldlenp, newp, newlen,
1653: &ip_allowsrcrt));
1.52 thorpej 1654: case IPCTL_SUBNETSARELOCAL:
1655: return (sysctl_int(oldp, oldlenp, newp, newlen,
1656: &subnetsarelocal));
1.53 kml 1657: case IPCTL_MTUDISC:
1.60 kml 1658: error = sysctl_int(oldp, oldlenp, newp, newlen,
1659: &ip_mtudisc);
1660: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1661: ip_mtudisc_timeout_q =
1662: rt_timer_queue_create(ip_mtudisc_timeout);
1663: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1664: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1665: ip_mtudisc_timeout_q = NULL;
1666: }
1667: return error;
1.54 lukem 1668: case IPCTL_ANONPORTMIN:
1669: old = anonportmin;
1670: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1671: if (anonportmin >= anonportmax || anonportmin < 0
1672: || anonportmin > 65535
1.54 lukem 1673: #ifndef IPNOPRIVPORTS
1674: || anonportmin < IPPORT_RESERVED
1675: #endif
1676: ) {
1677: anonportmin = old;
1678: return (EINVAL);
1679: }
1680: return (error);
1681: case IPCTL_ANONPORTMAX:
1682: old = anonportmax;
1683: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1684: if (anonportmin >= anonportmax || anonportmax < 0
1685: || anonportmax > 65535
1.54 lukem 1686: #ifndef IPNOPRIVPORTS
1687: || anonportmax < IPPORT_RESERVED
1688: #endif
1689: ) {
1690: anonportmax = old;
1691: return (EINVAL);
1692: }
1.60 kml 1693: return (error);
1694: case IPCTL_MTUDISCTIMEOUT:
1695: error = sysctl_int(oldp, oldlenp, newp, newlen,
1696: &ip_mtudisc_timeout);
1697: if (ip_mtudisc_timeout_q != NULL)
1698: rt_timer_queue_change(ip_mtudisc_timeout_q,
1699: ip_mtudisc_timeout);
1.54 lukem 1700: return (error);
1.65 matt 1701: #ifdef GATEWAY
1702: case IPCTL_MAXFLOWS:
1.67 thorpej 1703: {
1704: int s;
1705:
1.65 matt 1706: error = sysctl_int(oldp, oldlenp, newp, newlen,
1707: &ip_maxflows);
1.67 thorpej 1708: s = splsoftnet();
1.65 matt 1709: ipflow_reap(0);
1.67 thorpej 1710: splx(s);
1.65 matt 1711: return (error);
1.67 thorpej 1712: }
1.89 itojun 1713: #endif
1.90 itojun 1714: case IPCTL_HOSTZEROBROADCAST:
1715: return (sysctl_int(oldp, oldlenp, newp, newlen,
1716: &hostzeroisbroadcast));
1.89 itojun 1717: #if NGIF > 0
1718: case IPCTL_GIF_TTL:
1719: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1720: &ip_gif_ttl));
1.117 tron 1721: #endif
1722:
1723: #ifndef IPNOPRIVPORTS
1724: case IPCTL_LOWPORTMIN:
1725: old = lowportmin;
1726: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1727: if (lowportmin >= lowportmax
1728: || lowportmin > IPPORT_RESERVEDMAX
1729: || lowportmin < IPPORT_RESERVEDMIN
1730: ) {
1731: lowportmin = old;
1732: return (EINVAL);
1733: }
1734: return (error);
1735: case IPCTL_LOWPORTMAX:
1736: old = lowportmax;
1737: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1738: if (lowportmin >= lowportmax
1739: || lowportmax > IPPORT_RESERVEDMAX
1740: || lowportmax < IPPORT_RESERVEDMIN
1741: ) {
1742: lowportmax = old;
1743: return (EINVAL);
1744: }
1745: return (error);
1.65 matt 1746: #endif
1.88 sommerfe 1747:
1.13 mycroft 1748: default:
1749: return (EOPNOTSUPP);
1750: }
1751: /* NOTREACHED */
1.1 cgd 1752: }
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