Annotation of src/sys/netinet/ip_input.c, Revision 1.115
1.115 ! mrg 1: /* $NetBSD: ip_input.c,v 1.114 2000/05/10 03:31:30 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: #include <netkey/key_debug.h>
151: #endif
1.44 thorpej 152:
1.1 cgd 153: #ifndef IPFORWARDING
154: #ifdef GATEWAY
155: #define IPFORWARDING 1 /* forward IP packets not for us */
156: #else /* GATEWAY */
157: #define IPFORWARDING 0 /* don't forward IP packets not for us */
158: #endif /* GATEWAY */
159: #endif /* IPFORWARDING */
160: #ifndef IPSENDREDIRECTS
161: #define IPSENDREDIRECTS 1
162: #endif
1.26 thorpej 163: #ifndef IPFORWSRCRT
1.47 cjs 164: #define IPFORWSRCRT 1 /* forward source-routed packets */
165: #endif
166: #ifndef IPALLOWSRCRT
1.48 mrg 167: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 168: #endif
1.53 kml 169: #ifndef IPMTUDISC
170: #define IPMTUDISC 0
171: #endif
1.60 kml 172: #ifndef IPMTUDISCTIMEOUT
1.61 kml 173: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 174: #endif
1.53 kml 175:
1.27 thorpej 176: /*
177: * Note: DIRECTED_BROADCAST is handled this way so that previous
178: * configuration using this option will Just Work.
179: */
180: #ifndef IPDIRECTEDBCAST
181: #ifdef DIRECTED_BROADCAST
182: #define IPDIRECTEDBCAST 1
183: #else
184: #define IPDIRECTEDBCAST 0
185: #endif /* DIRECTED_BROADCAST */
186: #endif /* IPDIRECTEDBCAST */
1.1 cgd 187: int ipforwarding = IPFORWARDING;
188: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 189: int ip_defttl = IPDEFTTL;
1.26 thorpej 190: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 191: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 192: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 193: int ip_mtudisc = IPMTUDISC;
1.60 kml 194: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 195: #ifdef DIAGNOSTIC
196: int ipprintfs = 0;
197: #endif
198:
1.60 kml 199: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
200:
1.1 cgd 201: extern struct domain inetdomain;
202: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 203: struct in_ifaddrhead in_ifaddr;
1.57 tls 204: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 205: struct ifqueue ipintrq;
1.63 matt 206: struct ipstat ipstat;
207: u_int16_t ip_id;
1.75 thorpej 208:
1.63 matt 209: struct ipqhead ipq;
1.75 thorpej 210: int ipq_locked;
211:
212: static __inline int ipq_lock_try __P((void));
213: static __inline void ipq_unlock __P((void));
214:
215: static __inline int
216: ipq_lock_try()
217: {
218: int s;
219:
220: s = splimp();
221: if (ipq_locked) {
222: splx(s);
223: return (0);
224: }
225: ipq_locked = 1;
226: splx(s);
227: return (1);
228: }
229:
230: static __inline void
231: ipq_unlock()
232: {
233: int s;
234:
235: s = splimp();
236: ipq_locked = 0;
237: splx(s);
238: }
239:
240: #ifdef DIAGNOSTIC
241: #define IPQ_LOCK() \
242: do { \
243: if (ipq_lock_try() == 0) { \
244: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
245: panic("ipq_lock"); \
246: } \
247: } while (0)
248: #define IPQ_LOCK_CHECK() \
249: do { \
250: if (ipq_locked == 0) { \
251: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
252: panic("ipq lock check"); \
253: } \
254: } while (0)
255: #else
256: #define IPQ_LOCK() (void) ipq_lock_try()
257: #define IPQ_LOCK_CHECK() /* nothing */
258: #endif
259:
260: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 261:
1.72 thorpej 262: struct pool ipqent_pool;
263:
1.1 cgd 264: /*
265: * We need to save the IP options in case a protocol wants to respond
266: * to an incoming packet over the same route if the packet got here
267: * using IP source routing. This allows connection establishment and
268: * maintenance when the remote end is on a network that is not known
269: * to us.
270: */
271: int ip_nhops = 0;
272: static struct ip_srcrt {
273: struct in_addr dst; /* final destination */
274: char nop; /* one NOP to align */
275: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
276: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
277: } ip_srcrt;
278:
1.13 mycroft 279: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 280:
1.1 cgd 281: /*
282: * IP initialization: fill in IP protocol switch table.
283: * All protocols not implemented in kernel go to raw IP protocol handler.
284: */
1.8 mycroft 285: void
1.1 cgd 286: ip_init()
287: {
1.109 augustss 288: struct protosw *pr;
289: int i;
1.1 cgd 290:
1.72 thorpej 291: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
292: 0, NULL, NULL, M_IPQ);
293:
1.1 cgd 294: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
295: if (pr == 0)
296: panic("ip_init");
297: for (i = 0; i < IPPROTO_MAX; i++)
298: ip_protox[i] = pr - inetsw;
299: for (pr = inetdomain.dom_protosw;
300: pr < inetdomain.dom_protoswNPROTOSW; pr++)
301: if (pr->pr_domain->dom_family == PF_INET &&
302: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
303: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 304: LIST_INIT(&ipq);
1.1 cgd 305: ip_id = time.tv_sec & 0xffff;
306: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 307: TAILQ_INIT(&in_ifaddr);
1.57 tls 308: in_ifaddrhashtbl =
309: hashinit(IN_IFADDR_HASH_SIZE, M_IFADDR, M_WAITOK, &in_ifaddrhash);
1.60 kml 310: if (ip_mtudisc != 0)
311: ip_mtudisc_timeout_q =
312: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 313: #ifdef GATEWAY
314: ipflow_init();
315: #endif
1.1 cgd 316: }
317:
318: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
319: struct route ipforward_rt;
320:
321: /*
1.89 itojun 322: * IP software interrupt routine
323: */
324: void
325: ipintr()
326: {
327: int s;
328: struct mbuf *m;
329:
330: while (1) {
331: s = splimp();
332: IF_DEQUEUE(&ipintrq, m);
333: splx(s);
334: if (m == 0)
335: return;
336: ip_input(m);
337: }
338: }
339:
340: /*
1.1 cgd 341: * Ip input routine. Checksum and byte swap header. If fragmented
342: * try to reassemble. Process options. Pass to next level.
343: */
1.8 mycroft 344: void
1.89 itojun 345: ip_input(struct mbuf *m)
1.1 cgd 346: {
1.109 augustss 347: struct ip *ip = NULL;
348: struct ipq *fp;
349: struct in_ifaddr *ia;
350: struct ifaddr *ifa;
1.25 cgd 351: struct ipqent *ipqe;
1.89 itojun 352: int hlen = 0, mff, len;
1.100 itojun 353: int downmatch;
1.36 mrg 354: #ifdef PFIL_HOOKS
1.33 mrg 355: struct packet_filter_hook *pfh;
356: struct mbuf *m0;
1.43 mrg 357: int rv;
1.36 mrg 358: #endif /* PFIL_HOOKS */
1.1 cgd 359:
360: #ifdef DIAGNOSTIC
361: if ((m->m_flags & M_PKTHDR) == 0)
362: panic("ipintr no HDR");
363: #endif
1.89 itojun 364: #ifdef IPSEC
365: /*
366: * should the inner packet be considered authentic?
367: * see comment in ah4_input().
368: */
369: if (m) {
370: m->m_flags &= ~M_AUTHIPHDR;
371: m->m_flags &= ~M_AUTHIPDGM;
372: }
373: #endif
1.1 cgd 374: /*
375: * If no IP addresses have been set yet but the interfaces
376: * are receiving, can't do anything with incoming packets yet.
377: */
1.22 mycroft 378: if (in_ifaddr.tqh_first == 0)
1.1 cgd 379: goto bad;
380: ipstat.ips_total++;
381: if (m->m_len < sizeof (struct ip) &&
382: (m = m_pullup(m, sizeof (struct ip))) == 0) {
383: ipstat.ips_toosmall++;
1.89 itojun 384: return;
1.1 cgd 385: }
386: ip = mtod(m, struct ip *);
1.13 mycroft 387: if (ip->ip_v != IPVERSION) {
388: ipstat.ips_badvers++;
389: goto bad;
390: }
1.1 cgd 391: hlen = ip->ip_hl << 2;
392: if (hlen < sizeof(struct ip)) { /* minimum header length */
393: ipstat.ips_badhlen++;
394: goto bad;
395: }
396: if (hlen > m->m_len) {
397: if ((m = m_pullup(m, hlen)) == 0) {
398: ipstat.ips_badhlen++;
1.89 itojun 399: return;
1.1 cgd 400: }
401: ip = mtod(m, struct ip *);
402: }
1.98 thorpej 403:
1.85 hwr 404: /*
1.99 thorpej 405: * RFC1122: packets with a multicast source address are
1.98 thorpej 406: * not allowed.
1.85 hwr 407: */
408: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 409: /* XXX stat */
1.85 hwr 410: goto bad;
411: }
412:
1.78 mycroft 413: if (in_cksum(m, hlen) != 0) {
1.1 cgd 414: ipstat.ips_badsum++;
415: goto bad;
416: }
417:
418: /*
419: * Convert fields to host representation.
420: */
421: NTOHS(ip->ip_len);
422: NTOHS(ip->ip_off);
1.35 mycroft 423: len = ip->ip_len;
1.81 proff 424:
425: /*
426: * Check for additional length bogosity
427: */
1.84 proff 428: if (len < hlen) {
1.81 proff 429: ipstat.ips_badlen++;
430: goto bad;
431: }
1.1 cgd 432:
433: /*
434: * Check that the amount of data in the buffers
435: * is as at least much as the IP header would have us expect.
436: * Trim mbufs if longer than we expect.
437: * Drop packet if shorter than we expect.
438: */
1.35 mycroft 439: if (m->m_pkthdr.len < len) {
1.1 cgd 440: ipstat.ips_tooshort++;
441: goto bad;
442: }
1.35 mycroft 443: if (m->m_pkthdr.len > len) {
1.1 cgd 444: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 445: m->m_len = len;
446: m->m_pkthdr.len = len;
1.1 cgd 447: } else
1.35 mycroft 448: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 449: }
450:
1.94 itojun 451: #ifdef IPSEC
452: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
453: m->m_flags &= ~M_CANFASTFWD;
454: #else
1.64 thorpej 455: /*
456: * Assume that we can create a fast-forward IP flow entry
457: * based on this packet.
458: */
459: m->m_flags |= M_CANFASTFWD;
1.94 itojun 460: #endif
1.64 thorpej 461:
1.36 mrg 462: #ifdef PFIL_HOOKS
1.33 mrg 463: /*
1.64 thorpej 464: * Run through list of hooks for input packets. If there are any
465: * filters which require that additional packets in the flow are
466: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
467: * Note that filters must _never_ set this flag, as another filter
468: * in the list may have previously cleared it.
1.33 mrg 469: */
470: m0 = m;
1.102 darrenr 471: pfh = pfil_hook_get(PFIL_IN, &inetsw[ip_protox[IPPROTO_IP]].pr_pfh);
1.101 darrenr 472: for (; pfh; pfh = pfh->pfil_link.tqe_next)
1.33 mrg 473: if (pfh->pfil_func) {
1.101 darrenr 474: rv = pfh->pfil_func(ip, hlen,
475: m->m_pkthdr.rcvif, 0, &m0);
1.43 mrg 476: if (rv)
1.89 itojun 477: return;
1.68 sommerfe 478: m = m0;
479: if (m == NULL)
1.89 itojun 480: return;
1.68 sommerfe 481: ip = mtod(m, struct ip *);
1.33 mrg 482: }
1.36 mrg 483: #endif /* PFIL_HOOKS */
1.33 mrg 484:
1.1 cgd 485: /*
486: * Process options and, if not destined for us,
487: * ship it on. ip_dooptions returns 1 when an
488: * error was detected (causing an icmp message
489: * to be sent and the original packet to be freed).
490: */
491: ip_nhops = 0; /* for source routed packets */
492: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 493: return;
1.1 cgd 494:
495: /*
496: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 497: *
498: * Traditional 4.4BSD did not consult IFF_UP at all.
499: * The behavior here is to treat addresses on !IFF_UP interface
500: * as not mine.
1.1 cgd 501: */
1.100 itojun 502: downmatch = 0;
1.97 itojun 503: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
504: ia != NULL;
505: ia = ia->ia_hash.le_next) {
506: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
507: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
508: break;
1.100 itojun 509: else
510: downmatch++;
1.97 itojun 511: }
512: }
1.86 thorpej 513: if (ia != NULL)
514: goto ours;
1.57 tls 515: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
516: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
517: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
518: if (ifa->ifa_addr->sa_family != AF_INET) continue;
519: ia = ifatoia(ifa);
1.35 mycroft 520: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
521: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 522: /*
523: * Look for all-0's host part (old broadcast addr),
524: * either for subnet or net.
525: */
526: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 527: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 528: goto ours;
1.57 tls 529: /*
530: * An interface with IP address zero accepts
531: * all packets that arrive on that interface.
532: */
533: if (in_nullhost(ia->ia_addr.sin_addr))
534: goto ours;
1.1 cgd 535: }
536: }
1.18 mycroft 537: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 538: struct in_multi *inm;
539: #ifdef MROUTING
540: extern struct socket *ip_mrouter;
1.10 brezak 541:
542: if (m->m_flags & M_EXT) {
543: if ((m = m_pullup(m, hlen)) == 0) {
544: ipstat.ips_toosmall++;
1.89 itojun 545: return;
1.10 brezak 546: }
547: ip = mtod(m, struct ip *);
548: }
1.4 hpeyerl 549:
550: if (ip_mrouter) {
551: /*
552: * If we are acting as a multicast router, all
553: * incoming multicast packets are passed to the
554: * kernel-level multicast forwarding function.
555: * The packet is returned (relatively) intact; if
556: * ip_mforward() returns a non-zero value, the packet
557: * must be discarded, else it may be accepted below.
558: *
559: * (The IP ident field is put in the same byte order
560: * as expected when ip_mforward() is called from
561: * ip_output().)
562: */
1.13 mycroft 563: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
564: ipstat.ips_cantforward++;
1.4 hpeyerl 565: m_freem(m);
1.89 itojun 566: return;
1.4 hpeyerl 567: }
568:
569: /*
570: * The process-level routing demon needs to receive
571: * all multicast IGMP packets, whether or not this
572: * host belongs to their destination groups.
573: */
574: if (ip->ip_p == IPPROTO_IGMP)
575: goto ours;
1.13 mycroft 576: ipstat.ips_forward++;
1.4 hpeyerl 577: }
578: #endif
579: /*
580: * See if we belong to the destination multicast group on the
581: * arrival interface.
582: */
583: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
584: if (inm == NULL) {
1.13 mycroft 585: ipstat.ips_cantforward++;
1.4 hpeyerl 586: m_freem(m);
1.89 itojun 587: return;
1.4 hpeyerl 588: }
589: goto ours;
590: }
1.19 mycroft 591: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 592: in_nullhost(ip->ip_dst))
1.1 cgd 593: goto ours;
594:
595: /*
596: * Not for us; forward if possible and desirable.
597: */
598: if (ipforwarding == 0) {
599: ipstat.ips_cantforward++;
600: m_freem(m);
1.100 itojun 601: } else {
602: /*
603: * If ip_dst matched any of my address on !IFF_UP interface,
604: * and there's no IFF_UP interface that matches ip_dst,
605: * send icmp unreach. Forwarding it will result in in-kernel
606: * forwarding loop till TTL goes to 0.
607: */
608: if (downmatch) {
609: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
610: ipstat.ips_cantforward++;
611: return;
612: }
1.1 cgd 613: ip_forward(m, 0);
1.100 itojun 614: }
1.89 itojun 615: return;
1.1 cgd 616:
617: ours:
618: /*
619: * If offset or IP_MF are set, must reassemble.
620: * Otherwise, nothing need be done.
621: * (We could look in the reassembly queue to see
622: * if the packet was previously fragmented,
623: * but it's not worth the time; just let them time out.)
624: */
1.37 perry 625: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 626: /*
627: * Look for queue of fragments
628: * of this datagram.
629: */
1.75 thorpej 630: IPQ_LOCK();
1.25 cgd 631: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 632: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 633: in_hosteq(ip->ip_src, fp->ipq_src) &&
634: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 635: ip->ip_p == fp->ipq_p)
636: goto found;
637: fp = 0;
638: found:
639:
640: /*
641: * Adjust ip_len to not reflect header,
1.25 cgd 642: * set ipqe_mff if more fragments are expected,
1.1 cgd 643: * convert offset of this to bytes.
644: */
645: ip->ip_len -= hlen;
1.25 cgd 646: mff = (ip->ip_off & IP_MF) != 0;
647: if (mff) {
1.16 cgd 648: /*
649: * Make sure that fragments have a data length
650: * that's a non-zero multiple of 8 bytes.
651: */
1.17 cgd 652: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 653: ipstat.ips_badfrags++;
1.75 thorpej 654: IPQ_UNLOCK();
1.16 cgd 655: goto bad;
656: }
657: }
1.1 cgd 658: ip->ip_off <<= 3;
659:
660: /*
661: * If datagram marked as having more fragments
662: * or if this is not the first fragment,
663: * attempt reassembly; if it succeeds, proceed.
664: */
1.25 cgd 665: if (mff || ip->ip_off) {
1.1 cgd 666: ipstat.ips_fragments++;
1.72 thorpej 667: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 668: if (ipqe == NULL) {
669: ipstat.ips_rcvmemdrop++;
1.75 thorpej 670: IPQ_UNLOCK();
1.25 cgd 671: goto bad;
672: }
673: ipqe->ipqe_mff = mff;
1.50 thorpej 674: ipqe->ipqe_m = m;
1.25 cgd 675: ipqe->ipqe_ip = ip;
1.50 thorpej 676: m = ip_reass(ipqe, fp);
1.75 thorpej 677: if (m == 0) {
678: IPQ_UNLOCK();
1.89 itojun 679: return;
1.75 thorpej 680: }
1.13 mycroft 681: ipstat.ips_reassembled++;
1.50 thorpej 682: ip = mtod(m, struct ip *);
1.74 thorpej 683: hlen = ip->ip_hl << 2;
1.79 mycroft 684: ip->ip_len += hlen;
1.1 cgd 685: } else
686: if (fp)
687: ip_freef(fp);
1.75 thorpej 688: IPQ_UNLOCK();
1.79 mycroft 689: }
1.1 cgd 690:
691: /*
692: * Switch out to protocol's input routine.
693: */
1.82 aidan 694: #if IFA_STATS
695: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
696: #endif
1.1 cgd 697: ipstat.ips_delivered++;
1.89 itojun 698: {
699: int off = hlen, nh = ip->ip_p;
700:
701: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
702: return;
703: }
1.1 cgd 704: bad:
705: m_freem(m);
706: }
707:
708: /*
709: * Take incoming datagram fragment and try to
710: * reassemble it into whole datagram. If a chain for
711: * reassembly of this datagram already exists, then it
712: * is given as fp; otherwise have to make a chain.
713: */
1.50 thorpej 714: struct mbuf *
1.25 cgd 715: ip_reass(ipqe, fp)
1.109 augustss 716: struct ipqent *ipqe;
717: struct ipq *fp;
1.1 cgd 718: {
1.109 augustss 719: struct mbuf *m = ipqe->ipqe_m;
720: struct ipqent *nq, *p, *q;
1.25 cgd 721: struct ip *ip;
1.1 cgd 722: struct mbuf *t;
1.25 cgd 723: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 724: int i, next;
725:
1.75 thorpej 726: IPQ_LOCK_CHECK();
727:
1.1 cgd 728: /*
729: * Presence of header sizes in mbufs
730: * would confuse code below.
731: */
732: m->m_data += hlen;
733: m->m_len -= hlen;
734:
735: /*
736: * If first fragment to arrive, create a reassembly queue.
737: */
738: if (fp == 0) {
1.50 thorpej 739: MALLOC(fp, struct ipq *, sizeof (struct ipq),
740: M_FTABLE, M_NOWAIT);
741: if (fp == NULL)
1.1 cgd 742: goto dropfrag;
1.25 cgd 743: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 744: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 745: fp->ipq_p = ipqe->ipqe_ip->ip_p;
746: fp->ipq_id = ipqe->ipqe_ip->ip_id;
747: LIST_INIT(&fp->ipq_fragq);
748: fp->ipq_src = ipqe->ipqe_ip->ip_src;
749: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
750: p = NULL;
1.1 cgd 751: goto insert;
752: }
753:
754: /*
755: * Find a segment which begins after this one does.
756: */
1.25 cgd 757: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
758: p = q, q = q->ipqe_q.le_next)
759: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 760: break;
761:
762: /*
763: * If there is a preceding segment, it may provide some of
764: * our data already. If so, drop the data from the incoming
765: * segment. If it provides all of our data, drop us.
766: */
1.25 cgd 767: if (p != NULL) {
768: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
769: ipqe->ipqe_ip->ip_off;
1.1 cgd 770: if (i > 0) {
1.25 cgd 771: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 772: goto dropfrag;
1.50 thorpej 773: m_adj(ipqe->ipqe_m, i);
1.25 cgd 774: ipqe->ipqe_ip->ip_off += i;
775: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 776: }
777: }
778:
779: /*
780: * While we overlap succeeding segments trim them or,
781: * if they are completely covered, dequeue them.
782: */
1.25 cgd 783: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
784: q->ipqe_ip->ip_off; q = nq) {
785: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
786: q->ipqe_ip->ip_off;
787: if (i < q->ipqe_ip->ip_len) {
788: q->ipqe_ip->ip_len -= i;
789: q->ipqe_ip->ip_off += i;
1.50 thorpej 790: m_adj(q->ipqe_m, i);
1.1 cgd 791: break;
792: }
1.25 cgd 793: nq = q->ipqe_q.le_next;
1.50 thorpej 794: m_freem(q->ipqe_m);
1.25 cgd 795: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 796: pool_put(&ipqent_pool, q);
1.1 cgd 797: }
798:
799: insert:
800: /*
801: * Stick new segment in its place;
802: * check for complete reassembly.
803: */
1.25 cgd 804: if (p == NULL) {
805: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
806: } else {
807: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
808: }
1.1 cgd 809: next = 0;
1.25 cgd 810: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
811: p = q, q = q->ipqe_q.le_next) {
812: if (q->ipqe_ip->ip_off != next)
1.1 cgd 813: return (0);
1.25 cgd 814: next += q->ipqe_ip->ip_len;
1.1 cgd 815: }
1.25 cgd 816: if (p->ipqe_mff)
1.1 cgd 817: return (0);
818:
819: /*
1.41 thorpej 820: * Reassembly is complete. Check for a bogus message size and
821: * concatenate fragments.
1.1 cgd 822: */
1.25 cgd 823: q = fp->ipq_fragq.lh_first;
824: ip = q->ipqe_ip;
1.41 thorpej 825: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
826: ipstat.ips_toolong++;
827: ip_freef(fp);
828: return (0);
829: }
1.50 thorpej 830: m = q->ipqe_m;
1.1 cgd 831: t = m->m_next;
832: m->m_next = 0;
833: m_cat(m, t);
1.25 cgd 834: nq = q->ipqe_q.le_next;
1.72 thorpej 835: pool_put(&ipqent_pool, q);
1.25 cgd 836: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 837: t = q->ipqe_m;
1.25 cgd 838: nq = q->ipqe_q.le_next;
1.72 thorpej 839: pool_put(&ipqent_pool, q);
1.1 cgd 840: m_cat(m, t);
841: }
842:
843: /*
844: * Create header for new ip packet by
845: * modifying header of first packet;
846: * dequeue and discard fragment reassembly header.
847: * Make header visible.
848: */
849: ip->ip_len = next;
1.25 cgd 850: ip->ip_src = fp->ipq_src;
851: ip->ip_dst = fp->ipq_dst;
852: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 853: FREE(fp, M_FTABLE);
1.1 cgd 854: m->m_len += (ip->ip_hl << 2);
855: m->m_data -= (ip->ip_hl << 2);
856: /* some debugging cruft by sklower, below, will go away soon */
857: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 858: int plen = 0;
1.50 thorpej 859: for (t = m; t; t = t->m_next)
860: plen += t->m_len;
861: m->m_pkthdr.len = plen;
1.1 cgd 862: }
1.50 thorpej 863: return (m);
1.1 cgd 864:
865: dropfrag:
866: ipstat.ips_fragdropped++;
867: m_freem(m);
1.72 thorpej 868: pool_put(&ipqent_pool, ipqe);
1.1 cgd 869: return (0);
870: }
871:
872: /*
873: * Free a fragment reassembly header and all
874: * associated datagrams.
875: */
1.8 mycroft 876: void
1.1 cgd 877: ip_freef(fp)
878: struct ipq *fp;
879: {
1.109 augustss 880: struct ipqent *q, *p;
1.1 cgd 881:
1.75 thorpej 882: IPQ_LOCK_CHECK();
883:
1.25 cgd 884: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
885: p = q->ipqe_q.le_next;
1.50 thorpej 886: m_freem(q->ipqe_m);
1.25 cgd 887: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 888: pool_put(&ipqent_pool, q);
1.1 cgd 889: }
1.25 cgd 890: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 891: FREE(fp, M_FTABLE);
1.1 cgd 892: }
893:
894: /*
895: * IP timer processing;
896: * if a timer expires on a reassembly
897: * queue, discard it.
898: */
1.8 mycroft 899: void
1.1 cgd 900: ip_slowtimo()
901: {
1.109 augustss 902: struct ipq *fp, *nfp;
1.24 mycroft 903: int s = splsoftnet();
1.1 cgd 904:
1.75 thorpej 905: IPQ_LOCK();
1.25 cgd 906: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
907: nfp = fp->ipq_q.le_next;
908: if (--fp->ipq_ttl == 0) {
1.1 cgd 909: ipstat.ips_fragtimeout++;
1.25 cgd 910: ip_freef(fp);
1.1 cgd 911: }
912: }
1.75 thorpej 913: IPQ_UNLOCK();
1.63 matt 914: #ifdef GATEWAY
915: ipflow_slowtimo();
916: #endif
1.1 cgd 917: splx(s);
918: }
919:
920: /*
921: * Drain off all datagram fragments.
922: */
1.8 mycroft 923: void
1.1 cgd 924: ip_drain()
925: {
926:
1.75 thorpej 927: /*
928: * We may be called from a device's interrupt context. If
929: * the ipq is already busy, just bail out now.
930: */
931: if (ipq_lock_try() == 0)
932: return;
933:
1.25 cgd 934: while (ipq.lh_first != NULL) {
1.1 cgd 935: ipstat.ips_fragdropped++;
1.25 cgd 936: ip_freef(ipq.lh_first);
1.1 cgd 937: }
1.75 thorpej 938:
939: IPQ_UNLOCK();
1.1 cgd 940: }
941:
942: /*
943: * Do option processing on a datagram,
944: * possibly discarding it if bad options are encountered,
945: * or forwarding it if source-routed.
946: * Returns 1 if packet has been forwarded/freed,
947: * 0 if the packet should be processed further.
948: */
1.8 mycroft 949: int
1.1 cgd 950: ip_dooptions(m)
951: struct mbuf *m;
952: {
1.109 augustss 953: struct ip *ip = mtod(m, struct ip *);
954: u_char *cp, *cp0;
955: struct ip_timestamp *ipt;
956: struct in_ifaddr *ia;
1.1 cgd 957: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 958: struct in_addr dst;
1.1 cgd 959: n_time ntime;
960:
1.13 mycroft 961: dst = ip->ip_dst;
1.1 cgd 962: cp = (u_char *)(ip + 1);
963: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
964: for (; cnt > 0; cnt -= optlen, cp += optlen) {
965: opt = cp[IPOPT_OPTVAL];
966: if (opt == IPOPT_EOL)
967: break;
968: if (opt == IPOPT_NOP)
969: optlen = 1;
970: else {
1.113 itojun 971: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
972: code = &cp[IPOPT_OLEN] - (u_char *)ip;
973: goto bad;
974: }
1.1 cgd 975: optlen = cp[IPOPT_OLEN];
1.114 itojun 976: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 977: code = &cp[IPOPT_OLEN] - (u_char *)ip;
978: goto bad;
979: }
980: }
981: switch (opt) {
982:
983: default:
984: break;
985:
986: /*
987: * Source routing with record.
988: * Find interface with current destination address.
989: * If none on this machine then drop if strictly routed,
990: * or do nothing if loosely routed.
991: * Record interface address and bring up next address
992: * component. If strictly routed make sure next
993: * address is on directly accessible net.
994: */
995: case IPOPT_LSRR:
996: case IPOPT_SSRR:
1.47 cjs 997: if (ip_allowsrcrt == 0) {
998: type = ICMP_UNREACH;
999: code = ICMP_UNREACH_NET_PROHIB;
1000: goto bad;
1001: }
1.114 itojun 1002: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1003: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1004: goto bad;
1005: }
1.1 cgd 1006: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1007: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1008: goto bad;
1009: }
1010: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1011: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1012: if (ia == 0) {
1013: if (opt == IPOPT_SSRR) {
1014: type = ICMP_UNREACH;
1015: code = ICMP_UNREACH_SRCFAIL;
1016: goto bad;
1017: }
1018: /*
1019: * Loose routing, and not at next destination
1020: * yet; nothing to do except forward.
1021: */
1022: break;
1023: }
1024: off--; /* 0 origin */
1.112 sommerfe 1025: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1026: /*
1027: * End of source route. Should be for us.
1028: */
1029: save_rte(cp, ip->ip_src);
1030: break;
1031: }
1032: /*
1033: * locate outgoing interface
1034: */
1035: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1036: sizeof(ipaddr.sin_addr));
1.96 thorpej 1037: if (opt == IPOPT_SSRR)
1038: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1039: else
1.1 cgd 1040: ia = ip_rtaddr(ipaddr.sin_addr);
1041: if (ia == 0) {
1042: type = ICMP_UNREACH;
1043: code = ICMP_UNREACH_SRCFAIL;
1044: goto bad;
1045: }
1046: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1047: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1048: (caddr_t)(cp + off), sizeof(struct in_addr));
1049: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1050: /*
1051: * Let ip_intr's mcast routing check handle mcast pkts
1052: */
1.18 mycroft 1053: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1054: break;
1055:
1056: case IPOPT_RR:
1.114 itojun 1057: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1058: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1059: goto bad;
1060: }
1.1 cgd 1061: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1062: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1063: goto bad;
1064: }
1065: /*
1066: * If no space remains, ignore.
1067: */
1068: off--; /* 0 origin */
1.112 sommerfe 1069: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1070: break;
1071: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1072: sizeof(ipaddr.sin_addr));
1073: /*
1074: * locate outgoing interface; if we're the destination,
1075: * use the incoming interface (should be same).
1076: */
1.96 thorpej 1077: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1078: == NULL &&
1079: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1080: type = ICMP_UNREACH;
1081: code = ICMP_UNREACH_HOST;
1082: goto bad;
1083: }
1.20 mycroft 1084: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1085: (caddr_t)(cp + off), sizeof(struct in_addr));
1086: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1087: break;
1088:
1089: case IPOPT_TS:
1090: code = cp - (u_char *)ip;
1091: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1092: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1093: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1094: goto bad;
1.114 itojun 1095: }
1096: if (ipt->ipt_ptr < 5) {
1097: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1098: goto bad;
1099: }
1.15 cgd 1100: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1101: if (++ipt->ipt_oflw == 0) {
1102: code = (u_char *)&ipt->ipt_ptr -
1103: (u_char *)ip;
1.1 cgd 1104: goto bad;
1.114 itojun 1105: }
1.1 cgd 1106: break;
1107: }
1.104 thorpej 1108: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1109: switch (ipt->ipt_flg) {
1110:
1111: case IPOPT_TS_TSONLY:
1112: break;
1113:
1114: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1115: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1116: sizeof(struct in_addr) > ipt->ipt_len) {
1117: code = (u_char *)&ipt->ipt_ptr -
1118: (u_char *)ip;
1.1 cgd 1119: goto bad;
1.114 itojun 1120: }
1.13 mycroft 1121: ipaddr.sin_addr = dst;
1.96 thorpej 1122: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1123: m->m_pkthdr.rcvif));
1.13 mycroft 1124: if (ia == 0)
1125: continue;
1.104 thorpej 1126: bcopy(&ia->ia_addr.sin_addr,
1127: cp0, sizeof(struct in_addr));
1.1 cgd 1128: ipt->ipt_ptr += sizeof(struct in_addr);
1129: break;
1130:
1131: case IPOPT_TS_PRESPEC:
1.66 thorpej 1132: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1133: sizeof(struct in_addr) > ipt->ipt_len) {
1134: code = (u_char *)&ipt->ipt_ptr -
1135: (u_char *)ip;
1.1 cgd 1136: goto bad;
1.114 itojun 1137: }
1.104 thorpej 1138: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1139: sizeof(struct in_addr));
1.96 thorpej 1140: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1141: == NULL)
1.1 cgd 1142: continue;
1143: ipt->ipt_ptr += sizeof(struct in_addr);
1144: break;
1145:
1146: default:
1.114 itojun 1147: /* XXX can't take &ipt->ipt_flg */
1148: code = (u_char *)&ipt->ipt_ptr -
1149: (u_char *)ip + 1;
1.1 cgd 1150: goto bad;
1151: }
1152: ntime = iptime();
1.107 thorpej 1153: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1154: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1155: sizeof(n_time));
1156: ipt->ipt_ptr += sizeof(n_time);
1157: }
1158: }
1159: if (forward) {
1.26 thorpej 1160: if (ip_forwsrcrt == 0) {
1161: type = ICMP_UNREACH;
1162: code = ICMP_UNREACH_SRCFAIL;
1163: goto bad;
1164: }
1.1 cgd 1165: ip_forward(m, 1);
1166: return (1);
1.13 mycroft 1167: }
1168: return (0);
1.1 cgd 1169: bad:
1.13 mycroft 1170: icmp_error(m, type, code, 0, 0);
1171: ipstat.ips_badoptions++;
1.1 cgd 1172: return (1);
1173: }
1174:
1175: /*
1176: * Given address of next destination (final or next hop),
1177: * return internet address info of interface to be used to get there.
1178: */
1179: struct in_ifaddr *
1180: ip_rtaddr(dst)
1181: struct in_addr dst;
1182: {
1.109 augustss 1183: struct sockaddr_in *sin;
1.1 cgd 1184:
1.19 mycroft 1185: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1186:
1.35 mycroft 1187: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1188: if (ipforward_rt.ro_rt) {
1189: RTFREE(ipforward_rt.ro_rt);
1190: ipforward_rt.ro_rt = 0;
1191: }
1192: sin->sin_family = AF_INET;
1193: sin->sin_len = sizeof(*sin);
1194: sin->sin_addr = dst;
1195:
1196: rtalloc(&ipforward_rt);
1197: }
1198: if (ipforward_rt.ro_rt == 0)
1199: return ((struct in_ifaddr *)0);
1.19 mycroft 1200: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1201: }
1202:
1203: /*
1204: * Save incoming source route for use in replies,
1205: * to be picked up later by ip_srcroute if the receiver is interested.
1206: */
1.13 mycroft 1207: void
1.1 cgd 1208: save_rte(option, dst)
1209: u_char *option;
1210: struct in_addr dst;
1211: {
1212: unsigned olen;
1213:
1214: olen = option[IPOPT_OLEN];
1215: #ifdef DIAGNOSTIC
1216: if (ipprintfs)
1.39 christos 1217: printf("save_rte: olen %d\n", olen);
1.89 itojun 1218: #endif /* 0 */
1.1 cgd 1219: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1220: return;
1221: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1222: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1223: ip_srcrt.dst = dst;
1224: }
1225:
1226: /*
1227: * Retrieve incoming source route for use in replies,
1228: * in the same form used by setsockopt.
1229: * The first hop is placed before the options, will be removed later.
1230: */
1231: struct mbuf *
1232: ip_srcroute()
1233: {
1.109 augustss 1234: struct in_addr *p, *q;
1235: struct mbuf *m;
1.1 cgd 1236:
1237: if (ip_nhops == 0)
1238: return ((struct mbuf *)0);
1239: m = m_get(M_DONTWAIT, MT_SOOPTS);
1240: if (m == 0)
1241: return ((struct mbuf *)0);
1242:
1.13 mycroft 1243: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1244:
1245: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1246: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1247: OPTSIZ;
1248: #ifdef DIAGNOSTIC
1249: if (ipprintfs)
1.39 christos 1250: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1251: #endif
1252:
1253: /*
1254: * First save first hop for return route
1255: */
1256: p = &ip_srcrt.route[ip_nhops - 1];
1257: *(mtod(m, struct in_addr *)) = *p--;
1258: #ifdef DIAGNOSTIC
1259: if (ipprintfs)
1.39 christos 1260: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1261: #endif
1262:
1263: /*
1264: * Copy option fields and padding (nop) to mbuf.
1265: */
1266: ip_srcrt.nop = IPOPT_NOP;
1267: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1268: bcopy((caddr_t)&ip_srcrt.nop,
1269: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1270: q = (struct in_addr *)(mtod(m, caddr_t) +
1271: sizeof(struct in_addr) + OPTSIZ);
1272: #undef OPTSIZ
1273: /*
1274: * Record return path as an IP source route,
1275: * reversing the path (pointers are now aligned).
1276: */
1277: while (p >= ip_srcrt.route) {
1278: #ifdef DIAGNOSTIC
1279: if (ipprintfs)
1.39 christos 1280: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1281: #endif
1282: *q++ = *p--;
1283: }
1284: /*
1285: * Last hop goes to final destination.
1286: */
1287: *q = ip_srcrt.dst;
1288: #ifdef DIAGNOSTIC
1289: if (ipprintfs)
1.39 christos 1290: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1291: #endif
1292: return (m);
1293: }
1294:
1295: /*
1296: * Strip out IP options, at higher
1297: * level protocol in the kernel.
1298: * Second argument is buffer to which options
1299: * will be moved, and return value is their length.
1300: * XXX should be deleted; last arg currently ignored.
1301: */
1.8 mycroft 1302: void
1.1 cgd 1303: ip_stripoptions(m, mopt)
1.109 augustss 1304: struct mbuf *m;
1.1 cgd 1305: struct mbuf *mopt;
1306: {
1.109 augustss 1307: int i;
1.1 cgd 1308: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1309: caddr_t opts;
1.1 cgd 1310: int olen;
1311:
1.79 mycroft 1312: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1313: opts = (caddr_t)(ip + 1);
1314: i = m->m_len - (sizeof (struct ip) + olen);
1315: bcopy(opts + olen, opts, (unsigned)i);
1316: m->m_len -= olen;
1317: if (m->m_flags & M_PKTHDR)
1318: m->m_pkthdr.len -= olen;
1.79 mycroft 1319: ip->ip_len -= olen;
1320: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1321: }
1322:
1.23 mycroft 1323: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1324: 0, 0, 0, 0,
1325: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1326: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1327: EMSGSIZE, EHOSTUNREACH, 0, 0,
1328: 0, 0, 0, 0,
1329: ENOPROTOOPT
1330: };
1331:
1332: /*
1333: * Forward a packet. If some error occurs return the sender
1334: * an icmp packet. Note we can't always generate a meaningful
1335: * icmp message because icmp doesn't have a large enough repertoire
1336: * of codes and types.
1337: *
1338: * If not forwarding, just drop the packet. This could be confusing
1339: * if ipforwarding was zero but some routing protocol was advancing
1340: * us as a gateway to somewhere. However, we must let the routing
1341: * protocol deal with that.
1342: *
1343: * The srcrt parameter indicates whether the packet is being forwarded
1344: * via a source route.
1345: */
1.13 mycroft 1346: void
1.1 cgd 1347: ip_forward(m, srcrt)
1348: struct mbuf *m;
1349: int srcrt;
1350: {
1.109 augustss 1351: struct ip *ip = mtod(m, struct ip *);
1352: struct sockaddr_in *sin;
1353: struct rtentry *rt;
1.28 christos 1354: int error, type = 0, code = 0;
1.1 cgd 1355: struct mbuf *mcopy;
1.13 mycroft 1356: n_long dest;
1357: struct ifnet *destifp;
1.89 itojun 1358: #ifdef IPSEC
1359: struct ifnet dummyifp;
1360: #endif
1.1 cgd 1361:
1.13 mycroft 1362: dest = 0;
1.1 cgd 1363: #ifdef DIAGNOSTIC
1364: if (ipprintfs)
1.70 thorpej 1365: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1366: ntohl(ip->ip_src.s_addr),
1367: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1368: #endif
1.93 sommerfe 1369: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1370: ipstat.ips_cantforward++;
1371: m_freem(m);
1372: return;
1373: }
1374: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1375: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1376: return;
1377: }
1378: ip->ip_ttl -= IPTTLDEC;
1379:
1.19 mycroft 1380: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1381: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1382: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1383: if (ipforward_rt.ro_rt) {
1384: RTFREE(ipforward_rt.ro_rt);
1385: ipforward_rt.ro_rt = 0;
1386: }
1387: sin->sin_family = AF_INET;
1.35 mycroft 1388: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1389: sin->sin_addr = ip->ip_dst;
1390:
1391: rtalloc(&ipforward_rt);
1392: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1393: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1394: return;
1395: }
1396: rt = ipforward_rt.ro_rt;
1397: }
1398:
1399: /*
1.34 mycroft 1400: * Save at most 68 bytes of the packet in case
1.1 cgd 1401: * we need to generate an ICMP message to the src.
1402: */
1.34 mycroft 1403: mcopy = m_copy(m, 0, imin((int)ip->ip_len, 68));
1.1 cgd 1404:
1405: /*
1406: * If forwarding packet using same interface that it came in on,
1407: * perhaps should send a redirect to sender to shortcut a hop.
1408: * Only send redirect if source is sending directly to us,
1409: * and if packet was not source routed (or has any options).
1410: * Also, don't send redirect if forwarding using a default route
1411: * or a route modified by a redirect.
1412: */
1413: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1414: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1415: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1416: ipsendredirects && !srcrt) {
1.19 mycroft 1417: if (rt->rt_ifa &&
1418: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1419: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1420: if (rt->rt_flags & RTF_GATEWAY)
1421: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1422: else
1423: dest = ip->ip_dst.s_addr;
1424: /*
1425: * Router requirements says to only send host
1426: * redirects.
1427: */
1428: type = ICMP_REDIRECT;
1429: code = ICMP_REDIRECT_HOST;
1.1 cgd 1430: #ifdef DIAGNOSTIC
1.77 thorpej 1431: if (ipprintfs)
1432: printf("redirect (%d) to %x\n", code,
1433: (u_int32_t)dest);
1.1 cgd 1434: #endif
1435: }
1436: }
1437:
1.89 itojun 1438: #ifdef IPSEC
1.103 itojun 1439: /* Don't lookup socket in forwading case */
1440: ipsec_setsocket(m, NULL);
1441: #endif
1.27 thorpej 1442: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1443: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1444: if (error)
1445: ipstat.ips_cantforward++;
1446: else {
1447: ipstat.ips_forward++;
1448: if (type)
1449: ipstat.ips_redirectsent++;
1450: else {
1.63 matt 1451: if (mcopy) {
1452: #ifdef GATEWAY
1.64 thorpej 1453: if (mcopy->m_flags & M_CANFASTFWD)
1454: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1455: #endif
1.1 cgd 1456: m_freem(mcopy);
1.63 matt 1457: }
1.1 cgd 1458: return;
1459: }
1460: }
1461: if (mcopy == NULL)
1462: return;
1.13 mycroft 1463: destifp = NULL;
1464:
1.1 cgd 1465: switch (error) {
1466:
1467: case 0: /* forwarded, but need redirect */
1468: /* type, code set above */
1469: break;
1470:
1471: case ENETUNREACH: /* shouldn't happen, checked above */
1472: case EHOSTUNREACH:
1473: case ENETDOWN:
1474: case EHOSTDOWN:
1475: default:
1476: type = ICMP_UNREACH;
1477: code = ICMP_UNREACH_HOST;
1478: break;
1479:
1480: case EMSGSIZE:
1481: type = ICMP_UNREACH;
1482: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1483: #ifndef IPSEC
1.13 mycroft 1484: if (ipforward_rt.ro_rt)
1485: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1486: #else
1487: /*
1488: * If the packet is routed over IPsec tunnel, tell the
1489: * originator the tunnel MTU.
1490: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1491: * XXX quickhack!!!
1492: */
1493: if (ipforward_rt.ro_rt) {
1494: struct secpolicy *sp;
1495: int ipsecerror;
1.95 itojun 1496: size_t ipsechdr;
1.89 itojun 1497: struct route *ro;
1498:
1499: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1500: IPSEC_DIR_OUTBOUND,
1501: IP_FORWARDING,
1502: &ipsecerror);
1.89 itojun 1503:
1504: if (sp == NULL)
1505: destifp = ipforward_rt.ro_rt->rt_ifp;
1506: else {
1507: /* count IPsec header size */
1.95 itojun 1508: ipsechdr = ipsec4_hdrsiz(mcopy,
1509: IPSEC_DIR_OUTBOUND,
1510: NULL);
1.89 itojun 1511:
1512: /*
1513: * find the correct route for outer IPv4
1514: * header, compute tunnel MTU.
1515: *
1516: * XXX BUG ALERT
1517: * The "dummyifp" code relies upon the fact
1518: * that icmp_error() touches only ifp->if_mtu.
1519: */
1520: /*XXX*/
1521: destifp = NULL;
1522: if (sp->req != NULL
1.95 itojun 1523: && sp->req->sav != NULL
1524: && sp->req->sav->sah != NULL) {
1525: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1526: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1527: dummyifp.if_mtu =
1528: ro->ro_rt->rt_ifp->if_mtu;
1529: dummyifp.if_mtu -= ipsechdr;
1530: destifp = &dummyifp;
1531: }
1532: }
1533:
1534: key_freesp(sp);
1535: }
1536: }
1537: #endif /*IPSEC*/
1.1 cgd 1538: ipstat.ips_cantfrag++;
1539: break;
1540:
1541: case ENOBUFS:
1542: type = ICMP_SOURCEQUENCH;
1543: code = 0;
1544: break;
1545: }
1.13 mycroft 1546: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1547: }
1548:
1549: void
1550: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1551: struct inpcb *inp;
1552: struct mbuf **mp;
1553: struct ip *ip;
1554: struct mbuf *m;
1.44 thorpej 1555: {
1556:
1557: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1558: struct timeval tv;
1559:
1560: microtime(&tv);
1561: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1562: SCM_TIMESTAMP, SOL_SOCKET);
1563: if (*mp)
1564: mp = &(*mp)->m_next;
1565: }
1566: if (inp->inp_flags & INP_RECVDSTADDR) {
1567: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1568: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1569: if (*mp)
1570: mp = &(*mp)->m_next;
1571: }
1572: #ifdef notyet
1573: /*
1574: * XXX
1575: * Moving these out of udp_input() made them even more broken
1576: * than they already were.
1577: * - fenner@parc.xerox.com
1578: */
1579: /* options were tossed already */
1580: if (inp->inp_flags & INP_RECVOPTS) {
1581: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1582: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1583: if (*mp)
1584: mp = &(*mp)->m_next;
1585: }
1586: /* ip_srcroute doesn't do what we want here, need to fix */
1587: if (inp->inp_flags & INP_RECVRETOPTS) {
1588: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1589: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1590: if (*mp)
1591: mp = &(*mp)->m_next;
1592: }
1593: #endif
1594: if (inp->inp_flags & INP_RECVIF) {
1595: struct sockaddr_dl sdl;
1596:
1597: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1598: sdl.sdl_family = AF_LINK;
1599: sdl.sdl_index = m->m_pkthdr.rcvif ?
1600: m->m_pkthdr.rcvif->if_index : 0;
1601: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1602: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1603: IP_RECVIF, IPPROTO_IP);
1604: if (*mp)
1605: mp = &(*mp)->m_next;
1606: }
1.13 mycroft 1607: }
1608:
1609: int
1610: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1611: int *name;
1612: u_int namelen;
1613: void *oldp;
1614: size_t *oldlenp;
1615: void *newp;
1616: size_t newlen;
1617: {
1.88 sommerfe 1618: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1619:
1.54 lukem 1620: int error, old;
1621:
1.13 mycroft 1622: /* All sysctl names at this level are terminal. */
1623: if (namelen != 1)
1624: return (ENOTDIR);
1625:
1626: switch (name[0]) {
1627: case IPCTL_FORWARDING:
1628: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1629: case IPCTL_SENDREDIRECTS:
1630: return (sysctl_int(oldp, oldlenp, newp, newlen,
1631: &ipsendredirects));
1632: case IPCTL_DEFTTL:
1633: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1634: #ifdef notyet
1635: case IPCTL_DEFMTU:
1636: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1637: #endif
1.26 thorpej 1638: case IPCTL_FORWSRCRT:
1.47 cjs 1639: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1640: if (securelevel > 0)
1.46 cjs 1641: return (sysctl_rdint(oldp, oldlenp, newp,
1642: ip_forwsrcrt));
1643: else
1644: return (sysctl_int(oldp, oldlenp, newp, newlen,
1645: &ip_forwsrcrt));
1.27 thorpej 1646: case IPCTL_DIRECTEDBCAST:
1647: return (sysctl_int(oldp, oldlenp, newp, newlen,
1648: &ip_directedbcast));
1.47 cjs 1649: case IPCTL_ALLOWSRCRT:
1650: return (sysctl_int(oldp, oldlenp, newp, newlen,
1651: &ip_allowsrcrt));
1.52 thorpej 1652: case IPCTL_SUBNETSARELOCAL:
1653: return (sysctl_int(oldp, oldlenp, newp, newlen,
1654: &subnetsarelocal));
1.53 kml 1655: case IPCTL_MTUDISC:
1.60 kml 1656: error = sysctl_int(oldp, oldlenp, newp, newlen,
1657: &ip_mtudisc);
1658: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1659: ip_mtudisc_timeout_q =
1660: rt_timer_queue_create(ip_mtudisc_timeout);
1661: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1662: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1663: ip_mtudisc_timeout_q = NULL;
1664: }
1665: return error;
1.54 lukem 1666: case IPCTL_ANONPORTMIN:
1667: old = anonportmin;
1668: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1669: if (anonportmin >= anonportmax || anonportmin > 65535
1670: #ifndef IPNOPRIVPORTS
1671: || anonportmin < IPPORT_RESERVED
1672: #endif
1673: ) {
1674: anonportmin = old;
1675: return (EINVAL);
1676: }
1677: return (error);
1678: case IPCTL_ANONPORTMAX:
1679: old = anonportmax;
1680: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1681: if (anonportmin >= anonportmax || anonportmax > 65535
1682: #ifndef IPNOPRIVPORTS
1683: || anonportmax < IPPORT_RESERVED
1684: #endif
1685: ) {
1686: anonportmax = old;
1687: return (EINVAL);
1688: }
1.60 kml 1689: return (error);
1690: case IPCTL_MTUDISCTIMEOUT:
1691: error = sysctl_int(oldp, oldlenp, newp, newlen,
1692: &ip_mtudisc_timeout);
1693: if (ip_mtudisc_timeout_q != NULL)
1694: rt_timer_queue_change(ip_mtudisc_timeout_q,
1695: ip_mtudisc_timeout);
1.54 lukem 1696: return (error);
1.65 matt 1697: #ifdef GATEWAY
1698: case IPCTL_MAXFLOWS:
1.67 thorpej 1699: {
1700: int s;
1701:
1.65 matt 1702: error = sysctl_int(oldp, oldlenp, newp, newlen,
1703: &ip_maxflows);
1.67 thorpej 1704: s = splsoftnet();
1.65 matt 1705: ipflow_reap(0);
1.67 thorpej 1706: splx(s);
1.65 matt 1707: return (error);
1.67 thorpej 1708: }
1.89 itojun 1709: #endif
1.90 itojun 1710: case IPCTL_HOSTZEROBROADCAST:
1711: return (sysctl_int(oldp, oldlenp, newp, newlen,
1712: &hostzeroisbroadcast));
1.89 itojun 1713: #if NGIF > 0
1714: case IPCTL_GIF_TTL:
1715: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1716: &ip_gif_ttl));
1.65 matt 1717: #endif
1.88 sommerfe 1718:
1.13 mycroft 1719: default:
1720: return (EOPNOTSUPP);
1721: }
1722: /* NOTREACHED */
1.1 cgd 1723: }
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