Annotation of src/sys/netinet/ip_input.c, Revision 1.121
1.121 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.120 2000/11/08 14:28:15 ad 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:
1.121 ! thorpej 208: #ifdef PFIL_HOOKS
! 209: struct pfil_head inet_pfil_hook;
! 210: #endif
! 211:
1.63 matt 212: struct ipqhead ipq;
1.75 thorpej 213: int ipq_locked;
214:
215: static __inline int ipq_lock_try __P((void));
216: static __inline void ipq_unlock __P((void));
217:
218: static __inline int
219: ipq_lock_try()
220: {
221: int s;
222:
223: s = splimp();
224: if (ipq_locked) {
225: splx(s);
226: return (0);
227: }
228: ipq_locked = 1;
229: splx(s);
230: return (1);
231: }
232:
233: static __inline void
234: ipq_unlock()
235: {
236: int s;
237:
238: s = splimp();
239: ipq_locked = 0;
240: splx(s);
241: }
242:
243: #ifdef DIAGNOSTIC
244: #define IPQ_LOCK() \
245: do { \
246: if (ipq_lock_try() == 0) { \
247: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
248: panic("ipq_lock"); \
249: } \
250: } while (0)
251: #define IPQ_LOCK_CHECK() \
252: do { \
253: if (ipq_locked == 0) { \
254: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
255: panic("ipq lock check"); \
256: } \
257: } while (0)
258: #else
259: #define IPQ_LOCK() (void) ipq_lock_try()
260: #define IPQ_LOCK_CHECK() /* nothing */
261: #endif
262:
263: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 264:
1.72 thorpej 265: struct pool ipqent_pool;
266:
1.1 cgd 267: /*
268: * We need to save the IP options in case a protocol wants to respond
269: * to an incoming packet over the same route if the packet got here
270: * using IP source routing. This allows connection establishment and
271: * maintenance when the remote end is on a network that is not known
272: * to us.
273: */
274: int ip_nhops = 0;
275: static struct ip_srcrt {
276: struct in_addr dst; /* final destination */
277: char nop; /* one NOP to align */
278: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
279: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
280: } ip_srcrt;
281:
1.13 mycroft 282: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 283:
1.1 cgd 284: /*
285: * IP initialization: fill in IP protocol switch table.
286: * All protocols not implemented in kernel go to raw IP protocol handler.
287: */
1.8 mycroft 288: void
1.1 cgd 289: ip_init()
290: {
1.109 augustss 291: struct protosw *pr;
292: int i;
1.1 cgd 293:
1.72 thorpej 294: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
295: 0, NULL, NULL, M_IPQ);
296:
1.1 cgd 297: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
298: if (pr == 0)
299: panic("ip_init");
300: for (i = 0; i < IPPROTO_MAX; i++)
301: ip_protox[i] = pr - inetsw;
302: for (pr = inetdomain.dom_protosw;
303: pr < inetdomain.dom_protoswNPROTOSW; pr++)
304: if (pr->pr_domain->dom_family == PF_INET &&
305: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
306: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 307: LIST_INIT(&ipq);
1.1 cgd 308: ip_id = time.tv_sec & 0xffff;
309: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 310: TAILQ_INIT(&in_ifaddr);
1.120 ad 311: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
312: M_WAITOK, &in_ifaddrhash);
1.60 kml 313: if (ip_mtudisc != 0)
314: ip_mtudisc_timeout_q =
315: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 316: #ifdef GATEWAY
317: ipflow_init();
318: #endif
1.121 ! thorpej 319:
! 320: #ifdef PFIL_HOOKS
! 321: /* Register our Packet Filter hook. */
! 322: inet_pfil_hook.ph_key = (void *)(u_long) AF_INET;
! 323: inet_pfil_hook.ph_dlt = DLT_RAW;
! 324: i = pfil_head_register(&inet_pfil_hook);
! 325: if (i != 0)
! 326: printf("ip_init: WARNING: unable to register pfil hook, "
! 327: "error %d\n", i);
! 328: #endif /* PFIL_HOOKS */
1.1 cgd 329: }
330:
331: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
332: struct route ipforward_rt;
333:
334: /*
1.89 itojun 335: * IP software interrupt routine
336: */
337: void
338: ipintr()
339: {
340: int s;
341: struct mbuf *m;
342:
343: while (1) {
344: s = splimp();
345: IF_DEQUEUE(&ipintrq, m);
346: splx(s);
347: if (m == 0)
348: return;
349: ip_input(m);
350: }
351: }
352:
353: /*
1.1 cgd 354: * Ip input routine. Checksum and byte swap header. If fragmented
355: * try to reassemble. Process options. Pass to next level.
356: */
1.8 mycroft 357: void
1.89 itojun 358: ip_input(struct mbuf *m)
1.1 cgd 359: {
1.109 augustss 360: struct ip *ip = NULL;
361: struct ipq *fp;
362: struct in_ifaddr *ia;
363: struct ifaddr *ifa;
1.25 cgd 364: struct ipqent *ipqe;
1.89 itojun 365: int hlen = 0, mff, len;
1.100 itojun 366: int downmatch;
1.1 cgd 367:
368: #ifdef DIAGNOSTIC
369: if ((m->m_flags & M_PKTHDR) == 0)
370: panic("ipintr no HDR");
371: #endif
1.89 itojun 372: #ifdef IPSEC
373: /*
374: * should the inner packet be considered authentic?
375: * see comment in ah4_input().
376: */
377: if (m) {
378: m->m_flags &= ~M_AUTHIPHDR;
379: m->m_flags &= ~M_AUTHIPDGM;
380: }
381: #endif
1.1 cgd 382: /*
383: * If no IP addresses have been set yet but the interfaces
384: * are receiving, can't do anything with incoming packets yet.
385: */
1.22 mycroft 386: if (in_ifaddr.tqh_first == 0)
1.1 cgd 387: goto bad;
388: ipstat.ips_total++;
389: if (m->m_len < sizeof (struct ip) &&
390: (m = m_pullup(m, sizeof (struct ip))) == 0) {
391: ipstat.ips_toosmall++;
1.89 itojun 392: return;
1.1 cgd 393: }
394: ip = mtod(m, struct ip *);
1.13 mycroft 395: if (ip->ip_v != IPVERSION) {
396: ipstat.ips_badvers++;
397: goto bad;
398: }
1.1 cgd 399: hlen = ip->ip_hl << 2;
400: if (hlen < sizeof(struct ip)) { /* minimum header length */
401: ipstat.ips_badhlen++;
402: goto bad;
403: }
404: if (hlen > m->m_len) {
405: if ((m = m_pullup(m, hlen)) == 0) {
406: ipstat.ips_badhlen++;
1.89 itojun 407: return;
1.1 cgd 408: }
409: ip = mtod(m, struct ip *);
410: }
1.98 thorpej 411:
1.85 hwr 412: /*
1.99 thorpej 413: * RFC1122: packets with a multicast source address are
1.98 thorpej 414: * not allowed.
1.85 hwr 415: */
416: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 417: /* XXX stat */
1.85 hwr 418: goto bad;
419: }
420:
1.78 mycroft 421: if (in_cksum(m, hlen) != 0) {
1.1 cgd 422: ipstat.ips_badsum++;
423: goto bad;
424: }
425:
1.121 ! thorpej 426: /* Retrieve the packet length. */
! 427: len = ntohs(ip->ip_len);
1.81 proff 428:
429: /*
430: * Check for additional length bogosity
431: */
1.84 proff 432: if (len < hlen) {
1.81 proff 433: ipstat.ips_badlen++;
434: goto bad;
435: }
1.1 cgd 436:
437: /*
438: * Check that the amount of data in the buffers
439: * is as at least much as the IP header would have us expect.
440: * Trim mbufs if longer than we expect.
441: * Drop packet if shorter than we expect.
442: */
1.35 mycroft 443: if (m->m_pkthdr.len < len) {
1.1 cgd 444: ipstat.ips_tooshort++;
445: goto bad;
446: }
1.35 mycroft 447: if (m->m_pkthdr.len > len) {
1.1 cgd 448: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 449: m->m_len = len;
450: m->m_pkthdr.len = len;
1.1 cgd 451: } else
1.35 mycroft 452: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 453: }
454:
1.94 itojun 455: #ifdef IPSEC
456: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
457: m->m_flags &= ~M_CANFASTFWD;
458: #else
1.64 thorpej 459: /*
460: * Assume that we can create a fast-forward IP flow entry
461: * based on this packet.
462: */
463: m->m_flags |= M_CANFASTFWD;
1.94 itojun 464: #endif
1.64 thorpej 465:
1.36 mrg 466: #ifdef PFIL_HOOKS
1.33 mrg 467: /*
1.64 thorpej 468: * Run through list of hooks for input packets. If there are any
469: * filters which require that additional packets in the flow are
470: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
471: * Note that filters must _never_ set this flag, as another filter
472: * in the list may have previously cleared it.
1.33 mrg 473: */
1.121 ! thorpej 474: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
! 475: PFIL_IN) != 0)
! 476: return;
! 477: if (m == NULL)
! 478: return;
! 479: ip = mtod(m, struct ip *);
1.36 mrg 480: #endif /* PFIL_HOOKS */
1.121 ! thorpej 481:
! 482: /*
! 483: * Convert fields to host representation.
! 484: */
! 485: NTOHS(ip->ip_len);
! 486: NTOHS(ip->ip_off);
1.33 mrg 487:
1.1 cgd 488: /*
489: * Process options and, if not destined for us,
490: * ship it on. ip_dooptions returns 1 when an
491: * error was detected (causing an icmp message
492: * to be sent and the original packet to be freed).
493: */
494: ip_nhops = 0; /* for source routed packets */
495: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 496: return;
1.1 cgd 497:
498: /*
499: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 500: *
501: * Traditional 4.4BSD did not consult IFF_UP at all.
502: * The behavior here is to treat addresses on !IFF_UP interface
503: * as not mine.
1.1 cgd 504: */
1.100 itojun 505: downmatch = 0;
1.97 itojun 506: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
507: ia != NULL;
508: ia = ia->ia_hash.le_next) {
509: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
510: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
511: break;
1.100 itojun 512: else
513: downmatch++;
1.97 itojun 514: }
515: }
1.86 thorpej 516: if (ia != NULL)
517: goto ours;
1.57 tls 518: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
519: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
520: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
521: if (ifa->ifa_addr->sa_family != AF_INET) continue;
522: ia = ifatoia(ifa);
1.35 mycroft 523: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
524: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 525: /*
526: * Look for all-0's host part (old broadcast addr),
527: * either for subnet or net.
528: */
529: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 530: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 531: goto ours;
1.57 tls 532: /*
533: * An interface with IP address zero accepts
534: * all packets that arrive on that interface.
535: */
536: if (in_nullhost(ia->ia_addr.sin_addr))
537: goto ours;
1.1 cgd 538: }
539: }
1.18 mycroft 540: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 541: struct in_multi *inm;
542: #ifdef MROUTING
543: extern struct socket *ip_mrouter;
1.10 brezak 544:
545: if (m->m_flags & M_EXT) {
546: if ((m = m_pullup(m, hlen)) == 0) {
547: ipstat.ips_toosmall++;
1.89 itojun 548: return;
1.10 brezak 549: }
550: ip = mtod(m, struct ip *);
551: }
1.4 hpeyerl 552:
553: if (ip_mrouter) {
554: /*
555: * If we are acting as a multicast router, all
556: * incoming multicast packets are passed to the
557: * kernel-level multicast forwarding function.
558: * The packet is returned (relatively) intact; if
559: * ip_mforward() returns a non-zero value, the packet
560: * must be discarded, else it may be accepted below.
561: *
562: * (The IP ident field is put in the same byte order
563: * as expected when ip_mforward() is called from
564: * ip_output().)
565: */
1.13 mycroft 566: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
567: ipstat.ips_cantforward++;
1.4 hpeyerl 568: m_freem(m);
1.89 itojun 569: return;
1.4 hpeyerl 570: }
571:
572: /*
573: * The process-level routing demon needs to receive
574: * all multicast IGMP packets, whether or not this
575: * host belongs to their destination groups.
576: */
577: if (ip->ip_p == IPPROTO_IGMP)
578: goto ours;
1.13 mycroft 579: ipstat.ips_forward++;
1.4 hpeyerl 580: }
581: #endif
582: /*
583: * See if we belong to the destination multicast group on the
584: * arrival interface.
585: */
586: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
587: if (inm == NULL) {
1.13 mycroft 588: ipstat.ips_cantforward++;
1.4 hpeyerl 589: m_freem(m);
1.89 itojun 590: return;
1.4 hpeyerl 591: }
592: goto ours;
593: }
1.19 mycroft 594: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 595: in_nullhost(ip->ip_dst))
1.1 cgd 596: goto ours;
597:
598: /*
599: * Not for us; forward if possible and desirable.
600: */
601: if (ipforwarding == 0) {
602: ipstat.ips_cantforward++;
603: m_freem(m);
1.100 itojun 604: } else {
605: /*
606: * If ip_dst matched any of my address on !IFF_UP interface,
607: * and there's no IFF_UP interface that matches ip_dst,
608: * send icmp unreach. Forwarding it will result in in-kernel
609: * forwarding loop till TTL goes to 0.
610: */
611: if (downmatch) {
612: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
613: ipstat.ips_cantforward++;
614: return;
615: }
1.1 cgd 616: ip_forward(m, 0);
1.100 itojun 617: }
1.89 itojun 618: return;
1.1 cgd 619:
620: ours:
621: /*
622: * If offset or IP_MF are set, must reassemble.
623: * Otherwise, nothing need be done.
624: * (We could look in the reassembly queue to see
625: * if the packet was previously fragmented,
626: * but it's not worth the time; just let them time out.)
627: */
1.37 perry 628: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 629: /*
630: * Look for queue of fragments
631: * of this datagram.
632: */
1.75 thorpej 633: IPQ_LOCK();
1.25 cgd 634: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 635: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 636: in_hosteq(ip->ip_src, fp->ipq_src) &&
637: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 638: ip->ip_p == fp->ipq_p)
639: goto found;
640: fp = 0;
641: found:
642:
643: /*
644: * Adjust ip_len to not reflect header,
1.25 cgd 645: * set ipqe_mff if more fragments are expected,
1.1 cgd 646: * convert offset of this to bytes.
647: */
648: ip->ip_len -= hlen;
1.25 cgd 649: mff = (ip->ip_off & IP_MF) != 0;
650: if (mff) {
1.16 cgd 651: /*
652: * Make sure that fragments have a data length
653: * that's a non-zero multiple of 8 bytes.
654: */
1.17 cgd 655: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 656: ipstat.ips_badfrags++;
1.75 thorpej 657: IPQ_UNLOCK();
1.16 cgd 658: goto bad;
659: }
660: }
1.1 cgd 661: ip->ip_off <<= 3;
662:
663: /*
664: * If datagram marked as having more fragments
665: * or if this is not the first fragment,
666: * attempt reassembly; if it succeeds, proceed.
667: */
1.25 cgd 668: if (mff || ip->ip_off) {
1.1 cgd 669: ipstat.ips_fragments++;
1.72 thorpej 670: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 671: if (ipqe == NULL) {
672: ipstat.ips_rcvmemdrop++;
1.75 thorpej 673: IPQ_UNLOCK();
1.25 cgd 674: goto bad;
675: }
676: ipqe->ipqe_mff = mff;
1.50 thorpej 677: ipqe->ipqe_m = m;
1.25 cgd 678: ipqe->ipqe_ip = ip;
1.50 thorpej 679: m = ip_reass(ipqe, fp);
1.75 thorpej 680: if (m == 0) {
681: IPQ_UNLOCK();
1.89 itojun 682: return;
1.75 thorpej 683: }
1.13 mycroft 684: ipstat.ips_reassembled++;
1.50 thorpej 685: ip = mtod(m, struct ip *);
1.74 thorpej 686: hlen = ip->ip_hl << 2;
1.79 mycroft 687: ip->ip_len += hlen;
1.1 cgd 688: } else
689: if (fp)
690: ip_freef(fp);
1.75 thorpej 691: IPQ_UNLOCK();
1.79 mycroft 692: }
1.1 cgd 693:
694: /*
695: * Switch out to protocol's input routine.
696: */
1.82 aidan 697: #if IFA_STATS
698: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
699: #endif
1.1 cgd 700: ipstat.ips_delivered++;
1.89 itojun 701: {
702: int off = hlen, nh = ip->ip_p;
703:
704: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
705: return;
706: }
1.1 cgd 707: bad:
708: m_freem(m);
709: }
710:
711: /*
712: * Take incoming datagram fragment and try to
713: * reassemble it into whole datagram. If a chain for
714: * reassembly of this datagram already exists, then it
715: * is given as fp; otherwise have to make a chain.
716: */
1.50 thorpej 717: struct mbuf *
1.25 cgd 718: ip_reass(ipqe, fp)
1.109 augustss 719: struct ipqent *ipqe;
720: struct ipq *fp;
1.1 cgd 721: {
1.109 augustss 722: struct mbuf *m = ipqe->ipqe_m;
723: struct ipqent *nq, *p, *q;
1.25 cgd 724: struct ip *ip;
1.1 cgd 725: struct mbuf *t;
1.25 cgd 726: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 727: int i, next;
728:
1.75 thorpej 729: IPQ_LOCK_CHECK();
730:
1.1 cgd 731: /*
732: * Presence of header sizes in mbufs
733: * would confuse code below.
734: */
735: m->m_data += hlen;
736: m->m_len -= hlen;
737:
738: /*
739: * If first fragment to arrive, create a reassembly queue.
740: */
741: if (fp == 0) {
1.50 thorpej 742: MALLOC(fp, struct ipq *, sizeof (struct ipq),
743: M_FTABLE, M_NOWAIT);
744: if (fp == NULL)
1.1 cgd 745: goto dropfrag;
1.25 cgd 746: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 747: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 748: fp->ipq_p = ipqe->ipqe_ip->ip_p;
749: fp->ipq_id = ipqe->ipqe_ip->ip_id;
750: LIST_INIT(&fp->ipq_fragq);
751: fp->ipq_src = ipqe->ipqe_ip->ip_src;
752: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
753: p = NULL;
1.1 cgd 754: goto insert;
755: }
756:
757: /*
758: * Find a segment which begins after this one does.
759: */
1.25 cgd 760: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
761: p = q, q = q->ipqe_q.le_next)
762: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 763: break;
764:
765: /*
766: * If there is a preceding segment, it may provide some of
767: * our data already. If so, drop the data from the incoming
768: * segment. If it provides all of our data, drop us.
769: */
1.25 cgd 770: if (p != NULL) {
771: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
772: ipqe->ipqe_ip->ip_off;
1.1 cgd 773: if (i > 0) {
1.25 cgd 774: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 775: goto dropfrag;
1.50 thorpej 776: m_adj(ipqe->ipqe_m, i);
1.25 cgd 777: ipqe->ipqe_ip->ip_off += i;
778: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 779: }
780: }
781:
782: /*
783: * While we overlap succeeding segments trim them or,
784: * if they are completely covered, dequeue them.
785: */
1.25 cgd 786: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
787: q->ipqe_ip->ip_off; q = nq) {
788: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
789: q->ipqe_ip->ip_off;
790: if (i < q->ipqe_ip->ip_len) {
791: q->ipqe_ip->ip_len -= i;
792: q->ipqe_ip->ip_off += i;
1.50 thorpej 793: m_adj(q->ipqe_m, i);
1.1 cgd 794: break;
795: }
1.25 cgd 796: nq = q->ipqe_q.le_next;
1.50 thorpej 797: m_freem(q->ipqe_m);
1.25 cgd 798: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 799: pool_put(&ipqent_pool, q);
1.1 cgd 800: }
801:
802: insert:
803: /*
804: * Stick new segment in its place;
805: * check for complete reassembly.
806: */
1.25 cgd 807: if (p == NULL) {
808: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
809: } else {
810: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
811: }
1.1 cgd 812: next = 0;
1.25 cgd 813: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
814: p = q, q = q->ipqe_q.le_next) {
815: if (q->ipqe_ip->ip_off != next)
1.1 cgd 816: return (0);
1.25 cgd 817: next += q->ipqe_ip->ip_len;
1.1 cgd 818: }
1.25 cgd 819: if (p->ipqe_mff)
1.1 cgd 820: return (0);
821:
822: /*
1.41 thorpej 823: * Reassembly is complete. Check for a bogus message size and
824: * concatenate fragments.
1.1 cgd 825: */
1.25 cgd 826: q = fp->ipq_fragq.lh_first;
827: ip = q->ipqe_ip;
1.41 thorpej 828: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
829: ipstat.ips_toolong++;
830: ip_freef(fp);
831: return (0);
832: }
1.50 thorpej 833: m = q->ipqe_m;
1.1 cgd 834: t = m->m_next;
835: m->m_next = 0;
836: m_cat(m, t);
1.25 cgd 837: nq = q->ipqe_q.le_next;
1.72 thorpej 838: pool_put(&ipqent_pool, q);
1.25 cgd 839: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 840: t = q->ipqe_m;
1.25 cgd 841: nq = q->ipqe_q.le_next;
1.72 thorpej 842: pool_put(&ipqent_pool, q);
1.1 cgd 843: m_cat(m, t);
844: }
845:
846: /*
847: * Create header for new ip packet by
848: * modifying header of first packet;
849: * dequeue and discard fragment reassembly header.
850: * Make header visible.
851: */
852: ip->ip_len = next;
1.25 cgd 853: ip->ip_src = fp->ipq_src;
854: ip->ip_dst = fp->ipq_dst;
855: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 856: FREE(fp, M_FTABLE);
1.1 cgd 857: m->m_len += (ip->ip_hl << 2);
858: m->m_data -= (ip->ip_hl << 2);
859: /* some debugging cruft by sklower, below, will go away soon */
860: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 861: int plen = 0;
1.50 thorpej 862: for (t = m; t; t = t->m_next)
863: plen += t->m_len;
864: m->m_pkthdr.len = plen;
1.1 cgd 865: }
1.50 thorpej 866: return (m);
1.1 cgd 867:
868: dropfrag:
869: ipstat.ips_fragdropped++;
870: m_freem(m);
1.72 thorpej 871: pool_put(&ipqent_pool, ipqe);
1.1 cgd 872: return (0);
873: }
874:
875: /*
876: * Free a fragment reassembly header and all
877: * associated datagrams.
878: */
1.8 mycroft 879: void
1.1 cgd 880: ip_freef(fp)
881: struct ipq *fp;
882: {
1.109 augustss 883: struct ipqent *q, *p;
1.1 cgd 884:
1.75 thorpej 885: IPQ_LOCK_CHECK();
886:
1.25 cgd 887: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
888: p = q->ipqe_q.le_next;
1.50 thorpej 889: m_freem(q->ipqe_m);
1.25 cgd 890: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 891: pool_put(&ipqent_pool, q);
1.1 cgd 892: }
1.25 cgd 893: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 894: FREE(fp, M_FTABLE);
1.1 cgd 895: }
896:
897: /*
898: * IP timer processing;
899: * if a timer expires on a reassembly
900: * queue, discard it.
901: */
1.8 mycroft 902: void
1.1 cgd 903: ip_slowtimo()
904: {
1.109 augustss 905: struct ipq *fp, *nfp;
1.24 mycroft 906: int s = splsoftnet();
1.1 cgd 907:
1.75 thorpej 908: IPQ_LOCK();
1.25 cgd 909: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
910: nfp = fp->ipq_q.le_next;
911: if (--fp->ipq_ttl == 0) {
1.1 cgd 912: ipstat.ips_fragtimeout++;
1.25 cgd 913: ip_freef(fp);
1.1 cgd 914: }
915: }
1.75 thorpej 916: IPQ_UNLOCK();
1.63 matt 917: #ifdef GATEWAY
918: ipflow_slowtimo();
919: #endif
1.1 cgd 920: splx(s);
921: }
922:
923: /*
924: * Drain off all datagram fragments.
925: */
1.8 mycroft 926: void
1.1 cgd 927: ip_drain()
928: {
929:
1.75 thorpej 930: /*
931: * We may be called from a device's interrupt context. If
932: * the ipq is already busy, just bail out now.
933: */
934: if (ipq_lock_try() == 0)
935: return;
936:
1.25 cgd 937: while (ipq.lh_first != NULL) {
1.1 cgd 938: ipstat.ips_fragdropped++;
1.25 cgd 939: ip_freef(ipq.lh_first);
1.1 cgd 940: }
1.75 thorpej 941:
942: IPQ_UNLOCK();
1.1 cgd 943: }
944:
945: /*
946: * Do option processing on a datagram,
947: * possibly discarding it if bad options are encountered,
948: * or forwarding it if source-routed.
949: * Returns 1 if packet has been forwarded/freed,
950: * 0 if the packet should be processed further.
951: */
1.8 mycroft 952: int
1.1 cgd 953: ip_dooptions(m)
954: struct mbuf *m;
955: {
1.109 augustss 956: struct ip *ip = mtod(m, struct ip *);
957: u_char *cp, *cp0;
958: struct ip_timestamp *ipt;
959: struct in_ifaddr *ia;
1.1 cgd 960: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 961: struct in_addr dst;
1.1 cgd 962: n_time ntime;
963:
1.13 mycroft 964: dst = ip->ip_dst;
1.1 cgd 965: cp = (u_char *)(ip + 1);
966: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
967: for (; cnt > 0; cnt -= optlen, cp += optlen) {
968: opt = cp[IPOPT_OPTVAL];
969: if (opt == IPOPT_EOL)
970: break;
971: if (opt == IPOPT_NOP)
972: optlen = 1;
973: else {
1.113 itojun 974: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
975: code = &cp[IPOPT_OLEN] - (u_char *)ip;
976: goto bad;
977: }
1.1 cgd 978: optlen = cp[IPOPT_OLEN];
1.114 itojun 979: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 980: code = &cp[IPOPT_OLEN] - (u_char *)ip;
981: goto bad;
982: }
983: }
984: switch (opt) {
985:
986: default:
987: break;
988:
989: /*
990: * Source routing with record.
991: * Find interface with current destination address.
992: * If none on this machine then drop if strictly routed,
993: * or do nothing if loosely routed.
994: * Record interface address and bring up next address
995: * component. If strictly routed make sure next
996: * address is on directly accessible net.
997: */
998: case IPOPT_LSRR:
999: case IPOPT_SSRR:
1.47 cjs 1000: if (ip_allowsrcrt == 0) {
1001: type = ICMP_UNREACH;
1002: code = ICMP_UNREACH_NET_PROHIB;
1003: goto bad;
1004: }
1.114 itojun 1005: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1006: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1007: goto bad;
1008: }
1.1 cgd 1009: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1010: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1011: goto bad;
1012: }
1013: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1014: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1015: if (ia == 0) {
1016: if (opt == IPOPT_SSRR) {
1017: type = ICMP_UNREACH;
1018: code = ICMP_UNREACH_SRCFAIL;
1019: goto bad;
1020: }
1021: /*
1022: * Loose routing, and not at next destination
1023: * yet; nothing to do except forward.
1024: */
1025: break;
1026: }
1027: off--; /* 0 origin */
1.112 sommerfe 1028: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1029: /*
1030: * End of source route. Should be for us.
1031: */
1032: save_rte(cp, ip->ip_src);
1033: break;
1034: }
1035: /*
1036: * locate outgoing interface
1037: */
1038: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1039: sizeof(ipaddr.sin_addr));
1.96 thorpej 1040: if (opt == IPOPT_SSRR)
1041: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1042: else
1.1 cgd 1043: ia = ip_rtaddr(ipaddr.sin_addr);
1044: if (ia == 0) {
1045: type = ICMP_UNREACH;
1046: code = ICMP_UNREACH_SRCFAIL;
1047: goto bad;
1048: }
1049: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1050: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1051: (caddr_t)(cp + off), sizeof(struct in_addr));
1052: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1053: /*
1054: * Let ip_intr's mcast routing check handle mcast pkts
1055: */
1.18 mycroft 1056: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1057: break;
1058:
1059: case IPOPT_RR:
1.114 itojun 1060: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1061: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1062: goto bad;
1063: }
1.1 cgd 1064: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1065: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1066: goto bad;
1067: }
1068: /*
1069: * If no space remains, ignore.
1070: */
1071: off--; /* 0 origin */
1.112 sommerfe 1072: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1073: break;
1074: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1075: sizeof(ipaddr.sin_addr));
1076: /*
1077: * locate outgoing interface; if we're the destination,
1078: * use the incoming interface (should be same).
1079: */
1.96 thorpej 1080: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1081: == NULL &&
1082: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1083: type = ICMP_UNREACH;
1084: code = ICMP_UNREACH_HOST;
1085: goto bad;
1086: }
1.20 mycroft 1087: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1088: (caddr_t)(cp + off), sizeof(struct in_addr));
1089: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1090: break;
1091:
1092: case IPOPT_TS:
1093: code = cp - (u_char *)ip;
1094: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1095: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1096: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1097: goto bad;
1.114 itojun 1098: }
1099: if (ipt->ipt_ptr < 5) {
1100: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1101: goto bad;
1102: }
1.15 cgd 1103: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1104: if (++ipt->ipt_oflw == 0) {
1105: code = (u_char *)&ipt->ipt_ptr -
1106: (u_char *)ip;
1.1 cgd 1107: goto bad;
1.114 itojun 1108: }
1.1 cgd 1109: break;
1110: }
1.104 thorpej 1111: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1112: switch (ipt->ipt_flg) {
1113:
1114: case IPOPT_TS_TSONLY:
1115: break;
1116:
1117: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1118: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1119: sizeof(struct in_addr) > ipt->ipt_len) {
1120: code = (u_char *)&ipt->ipt_ptr -
1121: (u_char *)ip;
1.1 cgd 1122: goto bad;
1.114 itojun 1123: }
1.13 mycroft 1124: ipaddr.sin_addr = dst;
1.96 thorpej 1125: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1126: m->m_pkthdr.rcvif));
1.13 mycroft 1127: if (ia == 0)
1128: continue;
1.104 thorpej 1129: bcopy(&ia->ia_addr.sin_addr,
1130: cp0, sizeof(struct in_addr));
1.1 cgd 1131: ipt->ipt_ptr += sizeof(struct in_addr);
1132: break;
1133:
1134: case IPOPT_TS_PRESPEC:
1.66 thorpej 1135: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1136: sizeof(struct in_addr) > ipt->ipt_len) {
1137: code = (u_char *)&ipt->ipt_ptr -
1138: (u_char *)ip;
1.1 cgd 1139: goto bad;
1.114 itojun 1140: }
1.104 thorpej 1141: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1142: sizeof(struct in_addr));
1.96 thorpej 1143: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1144: == NULL)
1.1 cgd 1145: continue;
1146: ipt->ipt_ptr += sizeof(struct in_addr);
1147: break;
1148:
1149: default:
1.114 itojun 1150: /* XXX can't take &ipt->ipt_flg */
1151: code = (u_char *)&ipt->ipt_ptr -
1152: (u_char *)ip + 1;
1.1 cgd 1153: goto bad;
1154: }
1155: ntime = iptime();
1.107 thorpej 1156: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1157: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1158: sizeof(n_time));
1159: ipt->ipt_ptr += sizeof(n_time);
1160: }
1161: }
1162: if (forward) {
1.26 thorpej 1163: if (ip_forwsrcrt == 0) {
1164: type = ICMP_UNREACH;
1165: code = ICMP_UNREACH_SRCFAIL;
1166: goto bad;
1167: }
1.1 cgd 1168: ip_forward(m, 1);
1169: return (1);
1.13 mycroft 1170: }
1171: return (0);
1.1 cgd 1172: bad:
1.13 mycroft 1173: icmp_error(m, type, code, 0, 0);
1174: ipstat.ips_badoptions++;
1.1 cgd 1175: return (1);
1176: }
1177:
1178: /*
1179: * Given address of next destination (final or next hop),
1180: * return internet address info of interface to be used to get there.
1181: */
1182: struct in_ifaddr *
1183: ip_rtaddr(dst)
1184: struct in_addr dst;
1185: {
1.109 augustss 1186: struct sockaddr_in *sin;
1.1 cgd 1187:
1.19 mycroft 1188: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1189:
1.35 mycroft 1190: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1191: if (ipforward_rt.ro_rt) {
1192: RTFREE(ipforward_rt.ro_rt);
1193: ipforward_rt.ro_rt = 0;
1194: }
1195: sin->sin_family = AF_INET;
1196: sin->sin_len = sizeof(*sin);
1197: sin->sin_addr = dst;
1198:
1199: rtalloc(&ipforward_rt);
1200: }
1201: if (ipforward_rt.ro_rt == 0)
1202: return ((struct in_ifaddr *)0);
1.19 mycroft 1203: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1204: }
1205:
1206: /*
1207: * Save incoming source route for use in replies,
1208: * to be picked up later by ip_srcroute if the receiver is interested.
1209: */
1.13 mycroft 1210: void
1.1 cgd 1211: save_rte(option, dst)
1212: u_char *option;
1213: struct in_addr dst;
1214: {
1215: unsigned olen;
1216:
1217: olen = option[IPOPT_OLEN];
1218: #ifdef DIAGNOSTIC
1219: if (ipprintfs)
1.39 christos 1220: printf("save_rte: olen %d\n", olen);
1.89 itojun 1221: #endif /* 0 */
1.1 cgd 1222: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1223: return;
1224: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1225: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1226: ip_srcrt.dst = dst;
1227: }
1228:
1229: /*
1230: * Retrieve incoming source route for use in replies,
1231: * in the same form used by setsockopt.
1232: * The first hop is placed before the options, will be removed later.
1233: */
1234: struct mbuf *
1235: ip_srcroute()
1236: {
1.109 augustss 1237: struct in_addr *p, *q;
1238: struct mbuf *m;
1.1 cgd 1239:
1240: if (ip_nhops == 0)
1241: return ((struct mbuf *)0);
1242: m = m_get(M_DONTWAIT, MT_SOOPTS);
1243: if (m == 0)
1244: return ((struct mbuf *)0);
1245:
1.13 mycroft 1246: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1247:
1248: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1249: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1250: OPTSIZ;
1251: #ifdef DIAGNOSTIC
1252: if (ipprintfs)
1.39 christos 1253: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1254: #endif
1255:
1256: /*
1257: * First save first hop for return route
1258: */
1259: p = &ip_srcrt.route[ip_nhops - 1];
1260: *(mtod(m, struct in_addr *)) = *p--;
1261: #ifdef DIAGNOSTIC
1262: if (ipprintfs)
1.39 christos 1263: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1264: #endif
1265:
1266: /*
1267: * Copy option fields and padding (nop) to mbuf.
1268: */
1269: ip_srcrt.nop = IPOPT_NOP;
1270: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1271: bcopy((caddr_t)&ip_srcrt.nop,
1272: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1273: q = (struct in_addr *)(mtod(m, caddr_t) +
1274: sizeof(struct in_addr) + OPTSIZ);
1275: #undef OPTSIZ
1276: /*
1277: * Record return path as an IP source route,
1278: * reversing the path (pointers are now aligned).
1279: */
1280: while (p >= ip_srcrt.route) {
1281: #ifdef DIAGNOSTIC
1282: if (ipprintfs)
1.39 christos 1283: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1284: #endif
1285: *q++ = *p--;
1286: }
1287: /*
1288: * Last hop goes to final destination.
1289: */
1290: *q = ip_srcrt.dst;
1291: #ifdef DIAGNOSTIC
1292: if (ipprintfs)
1.39 christos 1293: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1294: #endif
1295: return (m);
1296: }
1297:
1298: /*
1299: * Strip out IP options, at higher
1300: * level protocol in the kernel.
1301: * Second argument is buffer to which options
1302: * will be moved, and return value is their length.
1303: * XXX should be deleted; last arg currently ignored.
1304: */
1.8 mycroft 1305: void
1.1 cgd 1306: ip_stripoptions(m, mopt)
1.109 augustss 1307: struct mbuf *m;
1.1 cgd 1308: struct mbuf *mopt;
1309: {
1.109 augustss 1310: int i;
1.1 cgd 1311: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1312: caddr_t opts;
1.1 cgd 1313: int olen;
1314:
1.79 mycroft 1315: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1316: opts = (caddr_t)(ip + 1);
1317: i = m->m_len - (sizeof (struct ip) + olen);
1318: bcopy(opts + olen, opts, (unsigned)i);
1319: m->m_len -= olen;
1320: if (m->m_flags & M_PKTHDR)
1321: m->m_pkthdr.len -= olen;
1.79 mycroft 1322: ip->ip_len -= olen;
1323: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1324: }
1325:
1.23 mycroft 1326: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1327: 0, 0, 0, 0,
1328: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1329: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1330: EMSGSIZE, EHOSTUNREACH, 0, 0,
1331: 0, 0, 0, 0,
1332: ENOPROTOOPT
1333: };
1334:
1335: /*
1336: * Forward a packet. If some error occurs return the sender
1337: * an icmp packet. Note we can't always generate a meaningful
1338: * icmp message because icmp doesn't have a large enough repertoire
1339: * of codes and types.
1340: *
1341: * If not forwarding, just drop the packet. This could be confusing
1342: * if ipforwarding was zero but some routing protocol was advancing
1343: * us as a gateway to somewhere. However, we must let the routing
1344: * protocol deal with that.
1345: *
1346: * The srcrt parameter indicates whether the packet is being forwarded
1347: * via a source route.
1348: */
1.13 mycroft 1349: void
1.1 cgd 1350: ip_forward(m, srcrt)
1351: struct mbuf *m;
1352: int srcrt;
1353: {
1.109 augustss 1354: struct ip *ip = mtod(m, struct ip *);
1355: struct sockaddr_in *sin;
1356: struct rtentry *rt;
1.28 christos 1357: int error, type = 0, code = 0;
1.1 cgd 1358: struct mbuf *mcopy;
1.13 mycroft 1359: n_long dest;
1360: struct ifnet *destifp;
1.89 itojun 1361: #ifdef IPSEC
1362: struct ifnet dummyifp;
1363: #endif
1.1 cgd 1364:
1.13 mycroft 1365: dest = 0;
1.1 cgd 1366: #ifdef DIAGNOSTIC
1367: if (ipprintfs)
1.70 thorpej 1368: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1369: ntohl(ip->ip_src.s_addr),
1370: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1371: #endif
1.93 sommerfe 1372: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1373: ipstat.ips_cantforward++;
1374: m_freem(m);
1375: return;
1376: }
1377: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1378: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1379: return;
1380: }
1381: ip->ip_ttl -= IPTTLDEC;
1382:
1.19 mycroft 1383: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1384: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1385: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1386: if (ipforward_rt.ro_rt) {
1387: RTFREE(ipforward_rt.ro_rt);
1388: ipforward_rt.ro_rt = 0;
1389: }
1390: sin->sin_family = AF_INET;
1.35 mycroft 1391: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1392: sin->sin_addr = ip->ip_dst;
1393:
1394: rtalloc(&ipforward_rt);
1395: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1396: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1397: return;
1398: }
1399: rt = ipforward_rt.ro_rt;
1400: }
1401:
1402: /*
1.34 mycroft 1403: * Save at most 68 bytes of the packet in case
1.1 cgd 1404: * we need to generate an ICMP message to the src.
1.119 itojun 1405: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1406: */
1.119 itojun 1407: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1408: if (mcopy)
1409: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1410:
1411: /*
1412: * If forwarding packet using same interface that it came in on,
1413: * perhaps should send a redirect to sender to shortcut a hop.
1414: * Only send redirect if source is sending directly to us,
1415: * and if packet was not source routed (or has any options).
1416: * Also, don't send redirect if forwarding using a default route
1417: * or a route modified by a redirect.
1418: */
1419: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1420: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1421: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1422: ipsendredirects && !srcrt) {
1.19 mycroft 1423: if (rt->rt_ifa &&
1424: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1425: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1426: if (rt->rt_flags & RTF_GATEWAY)
1427: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1428: else
1429: dest = ip->ip_dst.s_addr;
1430: /*
1431: * Router requirements says to only send host
1432: * redirects.
1433: */
1434: type = ICMP_REDIRECT;
1435: code = ICMP_REDIRECT_HOST;
1.1 cgd 1436: #ifdef DIAGNOSTIC
1.77 thorpej 1437: if (ipprintfs)
1438: printf("redirect (%d) to %x\n", code,
1439: (u_int32_t)dest);
1.1 cgd 1440: #endif
1441: }
1442: }
1443:
1.89 itojun 1444: #ifdef IPSEC
1.103 itojun 1445: /* Don't lookup socket in forwading case */
1446: ipsec_setsocket(m, NULL);
1447: #endif
1.27 thorpej 1448: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1449: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1450: if (error)
1451: ipstat.ips_cantforward++;
1452: else {
1453: ipstat.ips_forward++;
1454: if (type)
1455: ipstat.ips_redirectsent++;
1456: else {
1.63 matt 1457: if (mcopy) {
1458: #ifdef GATEWAY
1.64 thorpej 1459: if (mcopy->m_flags & M_CANFASTFWD)
1460: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1461: #endif
1.1 cgd 1462: m_freem(mcopy);
1.63 matt 1463: }
1.1 cgd 1464: return;
1465: }
1466: }
1467: if (mcopy == NULL)
1468: return;
1.13 mycroft 1469: destifp = NULL;
1470:
1.1 cgd 1471: switch (error) {
1472:
1473: case 0: /* forwarded, but need redirect */
1474: /* type, code set above */
1475: break;
1476:
1477: case ENETUNREACH: /* shouldn't happen, checked above */
1478: case EHOSTUNREACH:
1479: case ENETDOWN:
1480: case EHOSTDOWN:
1481: default:
1482: type = ICMP_UNREACH;
1483: code = ICMP_UNREACH_HOST;
1484: break;
1485:
1486: case EMSGSIZE:
1487: type = ICMP_UNREACH;
1488: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1489: #ifndef IPSEC
1.13 mycroft 1490: if (ipforward_rt.ro_rt)
1491: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1492: #else
1493: /*
1494: * If the packet is routed over IPsec tunnel, tell the
1495: * originator the tunnel MTU.
1496: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1497: * XXX quickhack!!!
1498: */
1499: if (ipforward_rt.ro_rt) {
1500: struct secpolicy *sp;
1501: int ipsecerror;
1.95 itojun 1502: size_t ipsechdr;
1.89 itojun 1503: struct route *ro;
1504:
1505: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1506: IPSEC_DIR_OUTBOUND,
1507: IP_FORWARDING,
1508: &ipsecerror);
1.89 itojun 1509:
1510: if (sp == NULL)
1511: destifp = ipforward_rt.ro_rt->rt_ifp;
1512: else {
1513: /* count IPsec header size */
1.95 itojun 1514: ipsechdr = ipsec4_hdrsiz(mcopy,
1515: IPSEC_DIR_OUTBOUND,
1516: NULL);
1.89 itojun 1517:
1518: /*
1519: * find the correct route for outer IPv4
1520: * header, compute tunnel MTU.
1521: *
1522: * XXX BUG ALERT
1523: * The "dummyifp" code relies upon the fact
1524: * that icmp_error() touches only ifp->if_mtu.
1525: */
1526: /*XXX*/
1527: destifp = NULL;
1528: if (sp->req != NULL
1.95 itojun 1529: && sp->req->sav != NULL
1530: && sp->req->sav->sah != NULL) {
1531: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1532: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1533: dummyifp.if_mtu =
1534: ro->ro_rt->rt_ifp->if_mtu;
1535: dummyifp.if_mtu -= ipsechdr;
1536: destifp = &dummyifp;
1537: }
1538: }
1539:
1540: key_freesp(sp);
1541: }
1542: }
1543: #endif /*IPSEC*/
1.1 cgd 1544: ipstat.ips_cantfrag++;
1545: break;
1546:
1547: case ENOBUFS:
1548: type = ICMP_SOURCEQUENCH;
1549: code = 0;
1550: break;
1551: }
1.13 mycroft 1552: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1553: }
1554:
1555: void
1556: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1557: struct inpcb *inp;
1558: struct mbuf **mp;
1559: struct ip *ip;
1560: struct mbuf *m;
1.44 thorpej 1561: {
1562:
1563: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1564: struct timeval tv;
1565:
1566: microtime(&tv);
1567: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1568: SCM_TIMESTAMP, SOL_SOCKET);
1569: if (*mp)
1570: mp = &(*mp)->m_next;
1571: }
1572: if (inp->inp_flags & INP_RECVDSTADDR) {
1573: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1574: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1575: if (*mp)
1576: mp = &(*mp)->m_next;
1577: }
1578: #ifdef notyet
1579: /*
1580: * XXX
1581: * Moving these out of udp_input() made them even more broken
1582: * than they already were.
1583: * - fenner@parc.xerox.com
1584: */
1585: /* options were tossed already */
1586: if (inp->inp_flags & INP_RECVOPTS) {
1587: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1588: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1589: if (*mp)
1590: mp = &(*mp)->m_next;
1591: }
1592: /* ip_srcroute doesn't do what we want here, need to fix */
1593: if (inp->inp_flags & INP_RECVRETOPTS) {
1594: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1595: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1596: if (*mp)
1597: mp = &(*mp)->m_next;
1598: }
1599: #endif
1600: if (inp->inp_flags & INP_RECVIF) {
1601: struct sockaddr_dl sdl;
1602:
1603: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1604: sdl.sdl_family = AF_LINK;
1605: sdl.sdl_index = m->m_pkthdr.rcvif ?
1606: m->m_pkthdr.rcvif->if_index : 0;
1607: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1608: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1609: IP_RECVIF, IPPROTO_IP);
1610: if (*mp)
1611: mp = &(*mp)->m_next;
1612: }
1.13 mycroft 1613: }
1614:
1615: int
1616: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1617: int *name;
1618: u_int namelen;
1619: void *oldp;
1620: size_t *oldlenp;
1621: void *newp;
1622: size_t newlen;
1623: {
1.88 sommerfe 1624: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1625:
1.54 lukem 1626: int error, old;
1627:
1.13 mycroft 1628: /* All sysctl names at this level are terminal. */
1629: if (namelen != 1)
1630: return (ENOTDIR);
1631:
1632: switch (name[0]) {
1633: case IPCTL_FORWARDING:
1634: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1635: case IPCTL_SENDREDIRECTS:
1636: return (sysctl_int(oldp, oldlenp, newp, newlen,
1637: &ipsendredirects));
1638: case IPCTL_DEFTTL:
1639: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1640: #ifdef notyet
1641: case IPCTL_DEFMTU:
1642: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1643: #endif
1.26 thorpej 1644: case IPCTL_FORWSRCRT:
1.47 cjs 1645: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1646: if (securelevel > 0)
1.46 cjs 1647: return (sysctl_rdint(oldp, oldlenp, newp,
1648: ip_forwsrcrt));
1649: else
1650: return (sysctl_int(oldp, oldlenp, newp, newlen,
1651: &ip_forwsrcrt));
1.27 thorpej 1652: case IPCTL_DIRECTEDBCAST:
1653: return (sysctl_int(oldp, oldlenp, newp, newlen,
1654: &ip_directedbcast));
1.47 cjs 1655: case IPCTL_ALLOWSRCRT:
1656: return (sysctl_int(oldp, oldlenp, newp, newlen,
1657: &ip_allowsrcrt));
1.52 thorpej 1658: case IPCTL_SUBNETSARELOCAL:
1659: return (sysctl_int(oldp, oldlenp, newp, newlen,
1660: &subnetsarelocal));
1.53 kml 1661: case IPCTL_MTUDISC:
1.60 kml 1662: error = sysctl_int(oldp, oldlenp, newp, newlen,
1663: &ip_mtudisc);
1664: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1665: ip_mtudisc_timeout_q =
1666: rt_timer_queue_create(ip_mtudisc_timeout);
1667: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1668: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1669: ip_mtudisc_timeout_q = NULL;
1670: }
1671: return error;
1.54 lukem 1672: case IPCTL_ANONPORTMIN:
1673: old = anonportmin;
1674: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1675: if (anonportmin >= anonportmax || anonportmin < 0
1676: || anonportmin > 65535
1.54 lukem 1677: #ifndef IPNOPRIVPORTS
1678: || anonportmin < IPPORT_RESERVED
1679: #endif
1680: ) {
1681: anonportmin = old;
1682: return (EINVAL);
1683: }
1684: return (error);
1685: case IPCTL_ANONPORTMAX:
1686: old = anonportmax;
1687: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1688: if (anonportmin >= anonportmax || anonportmax < 0
1689: || anonportmax > 65535
1.54 lukem 1690: #ifndef IPNOPRIVPORTS
1691: || anonportmax < IPPORT_RESERVED
1692: #endif
1693: ) {
1694: anonportmax = old;
1695: return (EINVAL);
1696: }
1.60 kml 1697: return (error);
1698: case IPCTL_MTUDISCTIMEOUT:
1699: error = sysctl_int(oldp, oldlenp, newp, newlen,
1700: &ip_mtudisc_timeout);
1701: if (ip_mtudisc_timeout_q != NULL)
1702: rt_timer_queue_change(ip_mtudisc_timeout_q,
1703: ip_mtudisc_timeout);
1.54 lukem 1704: return (error);
1.65 matt 1705: #ifdef GATEWAY
1706: case IPCTL_MAXFLOWS:
1.67 thorpej 1707: {
1708: int s;
1709:
1.65 matt 1710: error = sysctl_int(oldp, oldlenp, newp, newlen,
1711: &ip_maxflows);
1.67 thorpej 1712: s = splsoftnet();
1.65 matt 1713: ipflow_reap(0);
1.67 thorpej 1714: splx(s);
1.65 matt 1715: return (error);
1.67 thorpej 1716: }
1.89 itojun 1717: #endif
1.90 itojun 1718: case IPCTL_HOSTZEROBROADCAST:
1719: return (sysctl_int(oldp, oldlenp, newp, newlen,
1720: &hostzeroisbroadcast));
1.89 itojun 1721: #if NGIF > 0
1722: case IPCTL_GIF_TTL:
1723: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1724: &ip_gif_ttl));
1.117 tron 1725: #endif
1726:
1727: #ifndef IPNOPRIVPORTS
1728: case IPCTL_LOWPORTMIN:
1729: old = lowportmin;
1730: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1731: if (lowportmin >= lowportmax
1732: || lowportmin > IPPORT_RESERVEDMAX
1733: || lowportmin < IPPORT_RESERVEDMIN
1734: ) {
1735: lowportmin = old;
1736: return (EINVAL);
1737: }
1738: return (error);
1739: case IPCTL_LOWPORTMAX:
1740: old = lowportmax;
1741: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1742: if (lowportmin >= lowportmax
1743: || lowportmax > IPPORT_RESERVEDMAX
1744: || lowportmax < IPPORT_RESERVEDMIN
1745: ) {
1746: lowportmax = old;
1747: return (EINVAL);
1748: }
1749: return (error);
1.65 matt 1750: #endif
1.88 sommerfe 1751:
1.13 mycroft 1752: default:
1753: return (EOPNOTSUPP);
1754: }
1755: /* NOTREACHED */
1.1 cgd 1756: }
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