Annotation of src/sys/netinet/ip_input.c, Revision 1.128
1.128 ! itojun 1: /* $NetBSD: ip_input.c,v 1.127 2001/01/24 09:04:15 itojun Exp $ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. Neither the name of the project nor the names of its contributors
16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
1.76 thorpej 31:
32: /*-
33: * Copyright (c) 1998 The NetBSD Foundation, Inc.
34: * All rights reserved.
35: *
36: * This code is derived from software contributed to The NetBSD Foundation
37: * by Public Access Networks Corporation ("Panix"). It was developed under
38: * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the NetBSD
51: * Foundation, Inc. and its contributors.
52: * 4. Neither the name of The NetBSD Foundation nor the names of its
53: * contributors may be used to endorse or promote products derived
54: * from this software without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
57: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
58: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
59: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
60: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
61: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
62: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
63: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
64: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
65: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
66: * POSSIBILITY OF SUCH DAMAGE.
67: */
1.14 cgd 68:
1.1 cgd 69: /*
1.13 mycroft 70: * Copyright (c) 1982, 1986, 1988, 1993
71: * The Regents of the University of California. All rights reserved.
1.1 cgd 72: *
73: * Redistribution and use in source and binary forms, with or without
74: * modification, are permitted provided that the following conditions
75: * are met:
76: * 1. Redistributions of source code must retain the above copyright
77: * notice, this list of conditions and the following disclaimer.
78: * 2. Redistributions in binary form must reproduce the above copyright
79: * notice, this list of conditions and the following disclaimer in the
80: * documentation and/or other materials provided with the distribution.
81: * 3. All advertising materials mentioning features or use of this software
82: * must display the following acknowledgement:
83: * This product includes software developed by the University of
84: * California, Berkeley and its contributors.
85: * 4. Neither the name of the University nor the names of its contributors
86: * may be used to endorse or promote products derived from this software
87: * without specific prior written permission.
88: *
89: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
90: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
91: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
92: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
93: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
94: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
95: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
96: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
97: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
98: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99: * SUCH DAMAGE.
100: *
1.14 cgd 101: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 102: */
1.55 scottr 103:
1.62 matt 104: #include "opt_gateway.h"
1.69 mrg 105: #include "opt_pfil_hooks.h"
1.91 thorpej 106: #include "opt_ipsec.h"
1.55 scottr 107: #include "opt_mrouting.h"
1.1 cgd 108:
1.5 mycroft 109: #include <sys/param.h>
110: #include <sys/systm.h>
111: #include <sys/malloc.h>
112: #include <sys/mbuf.h>
113: #include <sys/domain.h>
114: #include <sys/protosw.h>
115: #include <sys/socket.h>
1.44 thorpej 116: #include <sys/socketvar.h>
1.5 mycroft 117: #include <sys/errno.h>
118: #include <sys/time.h>
119: #include <sys/kernel.h>
1.28 christos 120: #include <sys/proc.h>
1.72 thorpej 121: #include <sys/pool.h>
1.28 christos 122:
1.115 mrg 123: #include <uvm/uvm_extern.h>
124:
1.28 christos 125: #include <sys/sysctl.h>
1.1 cgd 126:
1.5 mycroft 127: #include <net/if.h>
1.44 thorpej 128: #include <net/if_dl.h>
1.5 mycroft 129: #include <net/route.h>
1.45 mrg 130: #include <net/pfil.h>
1.1 cgd 131:
1.5 mycroft 132: #include <netinet/in.h>
133: #include <netinet/in_systm.h>
134: #include <netinet/ip.h>
135: #include <netinet/in_pcb.h>
136: #include <netinet/in_var.h>
137: #include <netinet/ip_var.h>
138: #include <netinet/ip_icmp.h>
1.89 itojun 139: /* just for gif_ttl */
140: #include <netinet/in_gif.h>
141: #include "gif.h"
1.111 jdolecek 142:
143: #ifdef MROUTING
144: #include <netinet/ip_mroute.h>
145: #endif
1.89 itojun 146:
147: #ifdef IPSEC
148: #include <netinet6/ipsec.h>
149: #include <netkey/key.h>
150: #endif
1.44 thorpej 151:
1.1 cgd 152: #ifndef IPFORWARDING
153: #ifdef GATEWAY
154: #define IPFORWARDING 1 /* forward IP packets not for us */
155: #else /* GATEWAY */
156: #define IPFORWARDING 0 /* don't forward IP packets not for us */
157: #endif /* GATEWAY */
158: #endif /* IPFORWARDING */
159: #ifndef IPSENDREDIRECTS
160: #define IPSENDREDIRECTS 1
161: #endif
1.26 thorpej 162: #ifndef IPFORWSRCRT
1.47 cjs 163: #define IPFORWSRCRT 1 /* forward source-routed packets */
164: #endif
165: #ifndef IPALLOWSRCRT
1.48 mrg 166: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 167: #endif
1.53 kml 168: #ifndef IPMTUDISC
169: #define IPMTUDISC 0
170: #endif
1.60 kml 171: #ifndef IPMTUDISCTIMEOUT
1.61 kml 172: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 173: #endif
1.53 kml 174:
1.27 thorpej 175: /*
176: * Note: DIRECTED_BROADCAST is handled this way so that previous
177: * configuration using this option will Just Work.
178: */
179: #ifndef IPDIRECTEDBCAST
180: #ifdef DIRECTED_BROADCAST
181: #define IPDIRECTEDBCAST 1
182: #else
183: #define IPDIRECTEDBCAST 0
184: #endif /* DIRECTED_BROADCAST */
185: #endif /* IPDIRECTEDBCAST */
1.1 cgd 186: int ipforwarding = IPFORWARDING;
187: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 188: int ip_defttl = IPDEFTTL;
1.26 thorpej 189: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 190: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 191: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 192: int ip_mtudisc = IPMTUDISC;
1.60 kml 193: u_int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
197:
1.60 kml 198: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
199:
1.1 cgd 200: extern struct domain inetdomain;
201: int ipqmaxlen = IFQ_MAXLEN;
1.22 mycroft 202: struct in_ifaddrhead in_ifaddr;
1.57 tls 203: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.13 mycroft 204: struct ifqueue ipintrq;
1.63 matt 205: struct ipstat ipstat;
206: u_int16_t ip_id;
1.75 thorpej 207:
1.121 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. */
1.126 thorpej 322: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
323: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 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: */
1.127 itojun 474: /*
475: * let ipfilter look at packet on the wire,
476: * not the decapsulated packet.
477: */
478: #ifdef IPSEC
479: if (!ipsec_gethist(m, NULL))
480: #else
481: if (1)
482: #endif
483: {
484: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
485: PFIL_IN) != 0)
1.121 thorpej 486: return;
1.127 itojun 487: if (m == NULL)
488: return;
489: ip = mtod(m, struct ip *);
490: }
1.36 mrg 491: #endif /* PFIL_HOOKS */
1.123 thorpej 492:
493: #ifdef ALTQ
494: /* XXX Temporary until ALTQ is changed to use a pfil hook */
495: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
496: /* packet dropped by traffic conditioner */
497: return;
498: }
499: #endif
1.121 thorpej 500:
501: /*
502: * Convert fields to host representation.
503: */
504: NTOHS(ip->ip_len);
505: NTOHS(ip->ip_off);
1.33 mrg 506:
1.1 cgd 507: /*
508: * Process options and, if not destined for us,
509: * ship it on. ip_dooptions returns 1 when an
510: * error was detected (causing an icmp message
511: * to be sent and the original packet to be freed).
512: */
513: ip_nhops = 0; /* for source routed packets */
514: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 515: return;
1.1 cgd 516:
517: /*
518: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 519: *
520: * Traditional 4.4BSD did not consult IFF_UP at all.
521: * The behavior here is to treat addresses on !IFF_UP interface
522: * as not mine.
1.1 cgd 523: */
1.100 itojun 524: downmatch = 0;
1.97 itojun 525: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
526: ia != NULL;
527: ia = ia->ia_hash.le_next) {
528: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
529: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
530: break;
1.100 itojun 531: else
532: downmatch++;
1.97 itojun 533: }
534: }
1.86 thorpej 535: if (ia != NULL)
536: goto ours;
1.57 tls 537: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
538: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
539: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
540: if (ifa->ifa_addr->sa_family != AF_INET) continue;
541: ia = ifatoia(ifa);
1.35 mycroft 542: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
543: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 544: /*
545: * Look for all-0's host part (old broadcast addr),
546: * either for subnet or net.
547: */
548: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 549: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 550: goto ours;
1.57 tls 551: /*
552: * An interface with IP address zero accepts
553: * all packets that arrive on that interface.
554: */
555: if (in_nullhost(ia->ia_addr.sin_addr))
556: goto ours;
1.1 cgd 557: }
558: }
1.18 mycroft 559: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 560: struct in_multi *inm;
561: #ifdef MROUTING
562: extern struct socket *ip_mrouter;
1.10 brezak 563:
564: if (m->m_flags & M_EXT) {
565: if ((m = m_pullup(m, hlen)) == 0) {
566: ipstat.ips_toosmall++;
1.89 itojun 567: return;
1.10 brezak 568: }
569: ip = mtod(m, struct ip *);
570: }
1.4 hpeyerl 571:
572: if (ip_mrouter) {
573: /*
574: * If we are acting as a multicast router, all
575: * incoming multicast packets are passed to the
576: * kernel-level multicast forwarding function.
577: * The packet is returned (relatively) intact; if
578: * ip_mforward() returns a non-zero value, the packet
579: * must be discarded, else it may be accepted below.
580: *
581: * (The IP ident field is put in the same byte order
582: * as expected when ip_mforward() is called from
583: * ip_output().)
584: */
1.13 mycroft 585: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
586: ipstat.ips_cantforward++;
1.4 hpeyerl 587: m_freem(m);
1.89 itojun 588: return;
1.4 hpeyerl 589: }
590:
591: /*
592: * The process-level routing demon needs to receive
593: * all multicast IGMP packets, whether or not this
594: * host belongs to their destination groups.
595: */
596: if (ip->ip_p == IPPROTO_IGMP)
597: goto ours;
1.13 mycroft 598: ipstat.ips_forward++;
1.4 hpeyerl 599: }
600: #endif
601: /*
602: * See if we belong to the destination multicast group on the
603: * arrival interface.
604: */
605: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
606: if (inm == NULL) {
1.13 mycroft 607: ipstat.ips_cantforward++;
1.4 hpeyerl 608: m_freem(m);
1.89 itojun 609: return;
1.4 hpeyerl 610: }
611: goto ours;
612: }
1.19 mycroft 613: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 614: in_nullhost(ip->ip_dst))
1.1 cgd 615: goto ours;
616:
617: /*
618: * Not for us; forward if possible and desirable.
619: */
620: if (ipforwarding == 0) {
621: ipstat.ips_cantforward++;
622: m_freem(m);
1.100 itojun 623: } else {
624: /*
625: * If ip_dst matched any of my address on !IFF_UP interface,
626: * and there's no IFF_UP interface that matches ip_dst,
627: * send icmp unreach. Forwarding it will result in in-kernel
628: * forwarding loop till TTL goes to 0.
629: */
630: if (downmatch) {
631: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
632: ipstat.ips_cantforward++;
633: return;
634: }
1.1 cgd 635: ip_forward(m, 0);
1.100 itojun 636: }
1.89 itojun 637: return;
1.1 cgd 638:
639: ours:
640: /*
641: * If offset or IP_MF are set, must reassemble.
642: * Otherwise, nothing need be done.
643: * (We could look in the reassembly queue to see
644: * if the packet was previously fragmented,
645: * but it's not worth the time; just let them time out.)
646: */
1.37 perry 647: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 648: /*
649: * Look for queue of fragments
650: * of this datagram.
651: */
1.75 thorpej 652: IPQ_LOCK();
1.25 cgd 653: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 654: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 655: in_hosteq(ip->ip_src, fp->ipq_src) &&
656: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 657: ip->ip_p == fp->ipq_p)
658: goto found;
659: fp = 0;
660: found:
661:
662: /*
663: * Adjust ip_len to not reflect header,
1.25 cgd 664: * set ipqe_mff if more fragments are expected,
1.1 cgd 665: * convert offset of this to bytes.
666: */
667: ip->ip_len -= hlen;
1.25 cgd 668: mff = (ip->ip_off & IP_MF) != 0;
669: if (mff) {
1.16 cgd 670: /*
671: * Make sure that fragments have a data length
672: * that's a non-zero multiple of 8 bytes.
673: */
1.17 cgd 674: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 675: ipstat.ips_badfrags++;
1.75 thorpej 676: IPQ_UNLOCK();
1.16 cgd 677: goto bad;
678: }
679: }
1.1 cgd 680: ip->ip_off <<= 3;
681:
682: /*
683: * If datagram marked as having more fragments
684: * or if this is not the first fragment,
685: * attempt reassembly; if it succeeds, proceed.
686: */
1.25 cgd 687: if (mff || ip->ip_off) {
1.1 cgd 688: ipstat.ips_fragments++;
1.72 thorpej 689: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 690: if (ipqe == NULL) {
691: ipstat.ips_rcvmemdrop++;
1.75 thorpej 692: IPQ_UNLOCK();
1.25 cgd 693: goto bad;
694: }
695: ipqe->ipqe_mff = mff;
1.50 thorpej 696: ipqe->ipqe_m = m;
1.25 cgd 697: ipqe->ipqe_ip = ip;
1.50 thorpej 698: m = ip_reass(ipqe, fp);
1.75 thorpej 699: if (m == 0) {
700: IPQ_UNLOCK();
1.89 itojun 701: return;
1.75 thorpej 702: }
1.13 mycroft 703: ipstat.ips_reassembled++;
1.50 thorpej 704: ip = mtod(m, struct ip *);
1.74 thorpej 705: hlen = ip->ip_hl << 2;
1.79 mycroft 706: ip->ip_len += hlen;
1.1 cgd 707: } else
708: if (fp)
709: ip_freef(fp);
1.75 thorpej 710: IPQ_UNLOCK();
1.79 mycroft 711: }
1.128 ! itojun 712:
! 713: #ifdef IPSEC
! 714: /*
! 715: * enforce IPsec policy checking if we are seeing last header.
! 716: * note that we do not visit this with protocols with pcb layer
! 717: * code - like udp/tcp/raw ip.
! 718: */
! 719: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
! 720: ipsec4_in_reject(m, NULL)) {
! 721: ipsecstat.in_polvio++;
! 722: goto bad;
! 723: }
! 724: #endif
1.1 cgd 725:
726: /*
727: * Switch out to protocol's input routine.
728: */
1.82 aidan 729: #if IFA_STATS
1.122 itojun 730: if (ia && ip)
731: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 732: #endif
1.1 cgd 733: ipstat.ips_delivered++;
1.89 itojun 734: {
735: int off = hlen, nh = ip->ip_p;
736:
737: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
738: return;
739: }
1.1 cgd 740: bad:
741: m_freem(m);
742: }
743:
744: /*
745: * Take incoming datagram fragment and try to
746: * reassemble it into whole datagram. If a chain for
747: * reassembly of this datagram already exists, then it
748: * is given as fp; otherwise have to make a chain.
749: */
1.50 thorpej 750: struct mbuf *
1.25 cgd 751: ip_reass(ipqe, fp)
1.109 augustss 752: struct ipqent *ipqe;
753: struct ipq *fp;
1.1 cgd 754: {
1.109 augustss 755: struct mbuf *m = ipqe->ipqe_m;
756: struct ipqent *nq, *p, *q;
1.25 cgd 757: struct ip *ip;
1.1 cgd 758: struct mbuf *t;
1.25 cgd 759: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 760: int i, next;
761:
1.75 thorpej 762: IPQ_LOCK_CHECK();
763:
1.1 cgd 764: /*
765: * Presence of header sizes in mbufs
766: * would confuse code below.
767: */
768: m->m_data += hlen;
769: m->m_len -= hlen;
770:
771: /*
772: * If first fragment to arrive, create a reassembly queue.
773: */
774: if (fp == 0) {
1.50 thorpej 775: MALLOC(fp, struct ipq *, sizeof (struct ipq),
776: M_FTABLE, M_NOWAIT);
777: if (fp == NULL)
1.1 cgd 778: goto dropfrag;
1.25 cgd 779: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 780: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 781: fp->ipq_p = ipqe->ipqe_ip->ip_p;
782: fp->ipq_id = ipqe->ipqe_ip->ip_id;
783: LIST_INIT(&fp->ipq_fragq);
784: fp->ipq_src = ipqe->ipqe_ip->ip_src;
785: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
786: p = NULL;
1.1 cgd 787: goto insert;
788: }
789:
790: /*
791: * Find a segment which begins after this one does.
792: */
1.25 cgd 793: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
794: p = q, q = q->ipqe_q.le_next)
795: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 796: break;
797:
798: /*
799: * If there is a preceding segment, it may provide some of
800: * our data already. If so, drop the data from the incoming
801: * segment. If it provides all of our data, drop us.
802: */
1.25 cgd 803: if (p != NULL) {
804: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
805: ipqe->ipqe_ip->ip_off;
1.1 cgd 806: if (i > 0) {
1.25 cgd 807: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 808: goto dropfrag;
1.50 thorpej 809: m_adj(ipqe->ipqe_m, i);
1.25 cgd 810: ipqe->ipqe_ip->ip_off += i;
811: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 812: }
813: }
814:
815: /*
816: * While we overlap succeeding segments trim them or,
817: * if they are completely covered, dequeue them.
818: */
1.25 cgd 819: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
820: q->ipqe_ip->ip_off; q = nq) {
821: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
822: q->ipqe_ip->ip_off;
823: if (i < q->ipqe_ip->ip_len) {
824: q->ipqe_ip->ip_len -= i;
825: q->ipqe_ip->ip_off += i;
1.50 thorpej 826: m_adj(q->ipqe_m, i);
1.1 cgd 827: break;
828: }
1.25 cgd 829: nq = q->ipqe_q.le_next;
1.50 thorpej 830: m_freem(q->ipqe_m);
1.25 cgd 831: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 832: pool_put(&ipqent_pool, q);
1.1 cgd 833: }
834:
835: insert:
836: /*
837: * Stick new segment in its place;
838: * check for complete reassembly.
839: */
1.25 cgd 840: if (p == NULL) {
841: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
842: } else {
843: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
844: }
1.1 cgd 845: next = 0;
1.25 cgd 846: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
847: p = q, q = q->ipqe_q.le_next) {
848: if (q->ipqe_ip->ip_off != next)
1.1 cgd 849: return (0);
1.25 cgd 850: next += q->ipqe_ip->ip_len;
1.1 cgd 851: }
1.25 cgd 852: if (p->ipqe_mff)
1.1 cgd 853: return (0);
854:
855: /*
1.41 thorpej 856: * Reassembly is complete. Check for a bogus message size and
857: * concatenate fragments.
1.1 cgd 858: */
1.25 cgd 859: q = fp->ipq_fragq.lh_first;
860: ip = q->ipqe_ip;
1.41 thorpej 861: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
862: ipstat.ips_toolong++;
863: ip_freef(fp);
864: return (0);
865: }
1.50 thorpej 866: m = q->ipqe_m;
1.1 cgd 867: t = m->m_next;
868: m->m_next = 0;
869: m_cat(m, t);
1.25 cgd 870: nq = q->ipqe_q.le_next;
1.72 thorpej 871: pool_put(&ipqent_pool, q);
1.25 cgd 872: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 873: t = q->ipqe_m;
1.25 cgd 874: nq = q->ipqe_q.le_next;
1.72 thorpej 875: pool_put(&ipqent_pool, q);
1.1 cgd 876: m_cat(m, t);
877: }
878:
879: /*
880: * Create header for new ip packet by
881: * modifying header of first packet;
882: * dequeue and discard fragment reassembly header.
883: * Make header visible.
884: */
885: ip->ip_len = next;
1.25 cgd 886: ip->ip_src = fp->ipq_src;
887: ip->ip_dst = fp->ipq_dst;
888: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 889: FREE(fp, M_FTABLE);
1.1 cgd 890: m->m_len += (ip->ip_hl << 2);
891: m->m_data -= (ip->ip_hl << 2);
892: /* some debugging cruft by sklower, below, will go away soon */
893: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 894: int plen = 0;
1.50 thorpej 895: for (t = m; t; t = t->m_next)
896: plen += t->m_len;
897: m->m_pkthdr.len = plen;
1.1 cgd 898: }
1.50 thorpej 899: return (m);
1.1 cgd 900:
901: dropfrag:
902: ipstat.ips_fragdropped++;
903: m_freem(m);
1.72 thorpej 904: pool_put(&ipqent_pool, ipqe);
1.1 cgd 905: return (0);
906: }
907:
908: /*
909: * Free a fragment reassembly header and all
910: * associated datagrams.
911: */
1.8 mycroft 912: void
1.1 cgd 913: ip_freef(fp)
914: struct ipq *fp;
915: {
1.109 augustss 916: struct ipqent *q, *p;
1.1 cgd 917:
1.75 thorpej 918: IPQ_LOCK_CHECK();
919:
1.25 cgd 920: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
921: p = q->ipqe_q.le_next;
1.50 thorpej 922: m_freem(q->ipqe_m);
1.25 cgd 923: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 924: pool_put(&ipqent_pool, q);
1.1 cgd 925: }
1.25 cgd 926: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 927: FREE(fp, M_FTABLE);
1.1 cgd 928: }
929:
930: /*
931: * IP timer processing;
932: * if a timer expires on a reassembly
933: * queue, discard it.
934: */
1.8 mycroft 935: void
1.1 cgd 936: ip_slowtimo()
937: {
1.109 augustss 938: struct ipq *fp, *nfp;
1.24 mycroft 939: int s = splsoftnet();
1.1 cgd 940:
1.75 thorpej 941: IPQ_LOCK();
1.25 cgd 942: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
943: nfp = fp->ipq_q.le_next;
944: if (--fp->ipq_ttl == 0) {
1.1 cgd 945: ipstat.ips_fragtimeout++;
1.25 cgd 946: ip_freef(fp);
1.1 cgd 947: }
948: }
1.75 thorpej 949: IPQ_UNLOCK();
1.63 matt 950: #ifdef GATEWAY
951: ipflow_slowtimo();
952: #endif
1.1 cgd 953: splx(s);
954: }
955:
956: /*
957: * Drain off all datagram fragments.
958: */
1.8 mycroft 959: void
1.1 cgd 960: ip_drain()
961: {
962:
1.75 thorpej 963: /*
964: * We may be called from a device's interrupt context. If
965: * the ipq is already busy, just bail out now.
966: */
967: if (ipq_lock_try() == 0)
968: return;
969:
1.25 cgd 970: while (ipq.lh_first != NULL) {
1.1 cgd 971: ipstat.ips_fragdropped++;
1.25 cgd 972: ip_freef(ipq.lh_first);
1.1 cgd 973: }
1.75 thorpej 974:
975: IPQ_UNLOCK();
1.1 cgd 976: }
977:
978: /*
979: * Do option processing on a datagram,
980: * possibly discarding it if bad options are encountered,
981: * or forwarding it if source-routed.
982: * Returns 1 if packet has been forwarded/freed,
983: * 0 if the packet should be processed further.
984: */
1.8 mycroft 985: int
1.1 cgd 986: ip_dooptions(m)
987: struct mbuf *m;
988: {
1.109 augustss 989: struct ip *ip = mtod(m, struct ip *);
990: u_char *cp, *cp0;
991: struct ip_timestamp *ipt;
992: struct in_ifaddr *ia;
1.1 cgd 993: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 994: struct in_addr dst;
1.1 cgd 995: n_time ntime;
996:
1.13 mycroft 997: dst = ip->ip_dst;
1.1 cgd 998: cp = (u_char *)(ip + 1);
999: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1000: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1001: opt = cp[IPOPT_OPTVAL];
1002: if (opt == IPOPT_EOL)
1003: break;
1004: if (opt == IPOPT_NOP)
1005: optlen = 1;
1006: else {
1.113 itojun 1007: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1008: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1009: goto bad;
1010: }
1.1 cgd 1011: optlen = cp[IPOPT_OLEN];
1.114 itojun 1012: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1013: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1014: goto bad;
1015: }
1016: }
1017: switch (opt) {
1018:
1019: default:
1020: break;
1021:
1022: /*
1023: * Source routing with record.
1024: * Find interface with current destination address.
1025: * If none on this machine then drop if strictly routed,
1026: * or do nothing if loosely routed.
1027: * Record interface address and bring up next address
1028: * component. If strictly routed make sure next
1029: * address is on directly accessible net.
1030: */
1031: case IPOPT_LSRR:
1032: case IPOPT_SSRR:
1.47 cjs 1033: if (ip_allowsrcrt == 0) {
1034: type = ICMP_UNREACH;
1035: code = ICMP_UNREACH_NET_PROHIB;
1036: goto bad;
1037: }
1.114 itojun 1038: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1039: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1040: goto bad;
1041: }
1.1 cgd 1042: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1043: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1044: goto bad;
1045: }
1046: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1047: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1048: if (ia == 0) {
1049: if (opt == IPOPT_SSRR) {
1050: type = ICMP_UNREACH;
1051: code = ICMP_UNREACH_SRCFAIL;
1052: goto bad;
1053: }
1054: /*
1055: * Loose routing, and not at next destination
1056: * yet; nothing to do except forward.
1057: */
1058: break;
1059: }
1060: off--; /* 0 origin */
1.112 sommerfe 1061: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1062: /*
1063: * End of source route. Should be for us.
1064: */
1065: save_rte(cp, ip->ip_src);
1066: break;
1067: }
1068: /*
1069: * locate outgoing interface
1070: */
1071: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1072: sizeof(ipaddr.sin_addr));
1.96 thorpej 1073: if (opt == IPOPT_SSRR)
1074: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1075: else
1.1 cgd 1076: ia = ip_rtaddr(ipaddr.sin_addr);
1077: if (ia == 0) {
1078: type = ICMP_UNREACH;
1079: code = ICMP_UNREACH_SRCFAIL;
1080: goto bad;
1081: }
1082: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1083: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1084: (caddr_t)(cp + off), sizeof(struct in_addr));
1085: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1086: /*
1087: * Let ip_intr's mcast routing check handle mcast pkts
1088: */
1.18 mycroft 1089: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1090: break;
1091:
1092: case IPOPT_RR:
1.114 itojun 1093: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1094: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1095: goto bad;
1096: }
1.1 cgd 1097: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1098: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1099: goto bad;
1100: }
1101: /*
1102: * If no space remains, ignore.
1103: */
1104: off--; /* 0 origin */
1.112 sommerfe 1105: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1106: break;
1107: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1108: sizeof(ipaddr.sin_addr));
1109: /*
1110: * locate outgoing interface; if we're the destination,
1111: * use the incoming interface (should be same).
1112: */
1.96 thorpej 1113: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1114: == NULL &&
1115: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1116: type = ICMP_UNREACH;
1117: code = ICMP_UNREACH_HOST;
1118: goto bad;
1119: }
1.20 mycroft 1120: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1121: (caddr_t)(cp + off), sizeof(struct in_addr));
1122: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1123: break;
1124:
1125: case IPOPT_TS:
1126: code = cp - (u_char *)ip;
1127: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1128: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1129: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1130: goto bad;
1.114 itojun 1131: }
1132: if (ipt->ipt_ptr < 5) {
1133: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1134: goto bad;
1135: }
1.15 cgd 1136: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1137: if (++ipt->ipt_oflw == 0) {
1138: code = (u_char *)&ipt->ipt_ptr -
1139: (u_char *)ip;
1.1 cgd 1140: goto bad;
1.114 itojun 1141: }
1.1 cgd 1142: break;
1143: }
1.104 thorpej 1144: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1145: switch (ipt->ipt_flg) {
1146:
1147: case IPOPT_TS_TSONLY:
1148: break;
1149:
1150: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1151: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1152: sizeof(struct in_addr) > ipt->ipt_len) {
1153: code = (u_char *)&ipt->ipt_ptr -
1154: (u_char *)ip;
1.1 cgd 1155: goto bad;
1.114 itojun 1156: }
1.13 mycroft 1157: ipaddr.sin_addr = dst;
1.96 thorpej 1158: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1159: m->m_pkthdr.rcvif));
1.13 mycroft 1160: if (ia == 0)
1161: continue;
1.104 thorpej 1162: bcopy(&ia->ia_addr.sin_addr,
1163: cp0, sizeof(struct in_addr));
1.1 cgd 1164: ipt->ipt_ptr += sizeof(struct in_addr);
1165: break;
1166:
1167: case IPOPT_TS_PRESPEC:
1.66 thorpej 1168: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1169: sizeof(struct in_addr) > ipt->ipt_len) {
1170: code = (u_char *)&ipt->ipt_ptr -
1171: (u_char *)ip;
1.1 cgd 1172: goto bad;
1.114 itojun 1173: }
1.104 thorpej 1174: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1175: sizeof(struct in_addr));
1.96 thorpej 1176: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1177: == NULL)
1.1 cgd 1178: continue;
1179: ipt->ipt_ptr += sizeof(struct in_addr);
1180: break;
1181:
1182: default:
1.114 itojun 1183: /* XXX can't take &ipt->ipt_flg */
1184: code = (u_char *)&ipt->ipt_ptr -
1185: (u_char *)ip + 1;
1.1 cgd 1186: goto bad;
1187: }
1188: ntime = iptime();
1.107 thorpej 1189: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1190: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1191: sizeof(n_time));
1192: ipt->ipt_ptr += sizeof(n_time);
1193: }
1194: }
1195: if (forward) {
1.26 thorpej 1196: if (ip_forwsrcrt == 0) {
1197: type = ICMP_UNREACH;
1198: code = ICMP_UNREACH_SRCFAIL;
1199: goto bad;
1200: }
1.1 cgd 1201: ip_forward(m, 1);
1202: return (1);
1.13 mycroft 1203: }
1204: return (0);
1.1 cgd 1205: bad:
1.13 mycroft 1206: icmp_error(m, type, code, 0, 0);
1207: ipstat.ips_badoptions++;
1.1 cgd 1208: return (1);
1209: }
1210:
1211: /*
1212: * Given address of next destination (final or next hop),
1213: * return internet address info of interface to be used to get there.
1214: */
1215: struct in_ifaddr *
1216: ip_rtaddr(dst)
1217: struct in_addr dst;
1218: {
1.109 augustss 1219: struct sockaddr_in *sin;
1.1 cgd 1220:
1.19 mycroft 1221: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1222:
1.35 mycroft 1223: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1224: if (ipforward_rt.ro_rt) {
1225: RTFREE(ipforward_rt.ro_rt);
1226: ipforward_rt.ro_rt = 0;
1227: }
1228: sin->sin_family = AF_INET;
1229: sin->sin_len = sizeof(*sin);
1230: sin->sin_addr = dst;
1231:
1232: rtalloc(&ipforward_rt);
1233: }
1234: if (ipforward_rt.ro_rt == 0)
1235: return ((struct in_ifaddr *)0);
1.19 mycroft 1236: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1237: }
1238:
1239: /*
1240: * Save incoming source route for use in replies,
1241: * to be picked up later by ip_srcroute if the receiver is interested.
1242: */
1.13 mycroft 1243: void
1.1 cgd 1244: save_rte(option, dst)
1245: u_char *option;
1246: struct in_addr dst;
1247: {
1248: unsigned olen;
1249:
1250: olen = option[IPOPT_OLEN];
1251: #ifdef DIAGNOSTIC
1252: if (ipprintfs)
1.39 christos 1253: printf("save_rte: olen %d\n", olen);
1.89 itojun 1254: #endif /* 0 */
1.1 cgd 1255: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1256: return;
1257: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1258: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1259: ip_srcrt.dst = dst;
1260: }
1261:
1262: /*
1263: * Retrieve incoming source route for use in replies,
1264: * in the same form used by setsockopt.
1265: * The first hop is placed before the options, will be removed later.
1266: */
1267: struct mbuf *
1268: ip_srcroute()
1269: {
1.109 augustss 1270: struct in_addr *p, *q;
1271: struct mbuf *m;
1.1 cgd 1272:
1273: if (ip_nhops == 0)
1274: return ((struct mbuf *)0);
1275: m = m_get(M_DONTWAIT, MT_SOOPTS);
1276: if (m == 0)
1277: return ((struct mbuf *)0);
1278:
1.13 mycroft 1279: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1280:
1281: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1282: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1283: OPTSIZ;
1284: #ifdef DIAGNOSTIC
1285: if (ipprintfs)
1.39 christos 1286: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1287: #endif
1288:
1289: /*
1290: * First save first hop for return route
1291: */
1292: p = &ip_srcrt.route[ip_nhops - 1];
1293: *(mtod(m, struct in_addr *)) = *p--;
1294: #ifdef DIAGNOSTIC
1295: if (ipprintfs)
1.39 christos 1296: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1297: #endif
1298:
1299: /*
1300: * Copy option fields and padding (nop) to mbuf.
1301: */
1302: ip_srcrt.nop = IPOPT_NOP;
1303: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1304: bcopy((caddr_t)&ip_srcrt.nop,
1305: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1306: q = (struct in_addr *)(mtod(m, caddr_t) +
1307: sizeof(struct in_addr) + OPTSIZ);
1308: #undef OPTSIZ
1309: /*
1310: * Record return path as an IP source route,
1311: * reversing the path (pointers are now aligned).
1312: */
1313: while (p >= ip_srcrt.route) {
1314: #ifdef DIAGNOSTIC
1315: if (ipprintfs)
1.39 christos 1316: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1317: #endif
1318: *q++ = *p--;
1319: }
1320: /*
1321: * Last hop goes to final destination.
1322: */
1323: *q = ip_srcrt.dst;
1324: #ifdef DIAGNOSTIC
1325: if (ipprintfs)
1.39 christos 1326: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1327: #endif
1328: return (m);
1329: }
1330:
1331: /*
1332: * Strip out IP options, at higher
1333: * level protocol in the kernel.
1334: * Second argument is buffer to which options
1335: * will be moved, and return value is their length.
1336: * XXX should be deleted; last arg currently ignored.
1337: */
1.8 mycroft 1338: void
1.1 cgd 1339: ip_stripoptions(m, mopt)
1.109 augustss 1340: struct mbuf *m;
1.1 cgd 1341: struct mbuf *mopt;
1342: {
1.109 augustss 1343: int i;
1.1 cgd 1344: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1345: caddr_t opts;
1.1 cgd 1346: int olen;
1347:
1.79 mycroft 1348: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1349: opts = (caddr_t)(ip + 1);
1350: i = m->m_len - (sizeof (struct ip) + olen);
1351: bcopy(opts + olen, opts, (unsigned)i);
1352: m->m_len -= olen;
1353: if (m->m_flags & M_PKTHDR)
1354: m->m_pkthdr.len -= olen;
1.79 mycroft 1355: ip->ip_len -= olen;
1356: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1357: }
1358:
1.23 mycroft 1359: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1360: 0, 0, 0, 0,
1361: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1362: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1363: EMSGSIZE, EHOSTUNREACH, 0, 0,
1364: 0, 0, 0, 0,
1365: ENOPROTOOPT
1366: };
1367:
1368: /*
1369: * Forward a packet. If some error occurs return the sender
1370: * an icmp packet. Note we can't always generate a meaningful
1371: * icmp message because icmp doesn't have a large enough repertoire
1372: * of codes and types.
1373: *
1374: * If not forwarding, just drop the packet. This could be confusing
1375: * if ipforwarding was zero but some routing protocol was advancing
1376: * us as a gateway to somewhere. However, we must let the routing
1377: * protocol deal with that.
1378: *
1379: * The srcrt parameter indicates whether the packet is being forwarded
1380: * via a source route.
1381: */
1.13 mycroft 1382: void
1.1 cgd 1383: ip_forward(m, srcrt)
1384: struct mbuf *m;
1385: int srcrt;
1386: {
1.109 augustss 1387: struct ip *ip = mtod(m, struct ip *);
1388: struct sockaddr_in *sin;
1389: struct rtentry *rt;
1.28 christos 1390: int error, type = 0, code = 0;
1.1 cgd 1391: struct mbuf *mcopy;
1.13 mycroft 1392: n_long dest;
1393: struct ifnet *destifp;
1.89 itojun 1394: #ifdef IPSEC
1395: struct ifnet dummyifp;
1396: #endif
1.1 cgd 1397:
1.13 mycroft 1398: dest = 0;
1.1 cgd 1399: #ifdef DIAGNOSTIC
1400: if (ipprintfs)
1.70 thorpej 1401: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1402: ntohl(ip->ip_src.s_addr),
1403: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1404: #endif
1.93 sommerfe 1405: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1406: ipstat.ips_cantforward++;
1407: m_freem(m);
1408: return;
1409: }
1410: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1411: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1412: return;
1413: }
1414: ip->ip_ttl -= IPTTLDEC;
1415:
1.19 mycroft 1416: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1417: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1418: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1419: if (ipforward_rt.ro_rt) {
1420: RTFREE(ipforward_rt.ro_rt);
1421: ipforward_rt.ro_rt = 0;
1422: }
1423: sin->sin_family = AF_INET;
1.35 mycroft 1424: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1425: sin->sin_addr = ip->ip_dst;
1426:
1427: rtalloc(&ipforward_rt);
1428: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1429: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1430: return;
1431: }
1432: rt = ipforward_rt.ro_rt;
1433: }
1434:
1435: /*
1.34 mycroft 1436: * Save at most 68 bytes of the packet in case
1.1 cgd 1437: * we need to generate an ICMP message to the src.
1.119 itojun 1438: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1439: */
1.119 itojun 1440: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1441: if (mcopy)
1442: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1443:
1444: /*
1445: * If forwarding packet using same interface that it came in on,
1446: * perhaps should send a redirect to sender to shortcut a hop.
1447: * Only send redirect if source is sending directly to us,
1448: * and if packet was not source routed (or has any options).
1449: * Also, don't send redirect if forwarding using a default route
1450: * or a route modified by a redirect.
1451: */
1452: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1453: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1454: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1455: ipsendredirects && !srcrt) {
1.19 mycroft 1456: if (rt->rt_ifa &&
1457: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1458: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1459: if (rt->rt_flags & RTF_GATEWAY)
1460: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1461: else
1462: dest = ip->ip_dst.s_addr;
1463: /*
1464: * Router requirements says to only send host
1465: * redirects.
1466: */
1467: type = ICMP_REDIRECT;
1468: code = ICMP_REDIRECT_HOST;
1.1 cgd 1469: #ifdef DIAGNOSTIC
1.77 thorpej 1470: if (ipprintfs)
1471: printf("redirect (%d) to %x\n", code,
1472: (u_int32_t)dest);
1.1 cgd 1473: #endif
1474: }
1475: }
1476:
1.89 itojun 1477: #ifdef IPSEC
1.103 itojun 1478: /* Don't lookup socket in forwading case */
1.127 itojun 1479: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1480: #endif
1.27 thorpej 1481: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1482: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1483: if (error)
1484: ipstat.ips_cantforward++;
1485: else {
1486: ipstat.ips_forward++;
1487: if (type)
1488: ipstat.ips_redirectsent++;
1489: else {
1.63 matt 1490: if (mcopy) {
1491: #ifdef GATEWAY
1.64 thorpej 1492: if (mcopy->m_flags & M_CANFASTFWD)
1493: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1494: #endif
1.1 cgd 1495: m_freem(mcopy);
1.63 matt 1496: }
1.1 cgd 1497: return;
1498: }
1499: }
1500: if (mcopy == NULL)
1501: return;
1.13 mycroft 1502: destifp = NULL;
1503:
1.1 cgd 1504: switch (error) {
1505:
1506: case 0: /* forwarded, but need redirect */
1507: /* type, code set above */
1508: break;
1509:
1510: case ENETUNREACH: /* shouldn't happen, checked above */
1511: case EHOSTUNREACH:
1512: case ENETDOWN:
1513: case EHOSTDOWN:
1514: default:
1515: type = ICMP_UNREACH;
1516: code = ICMP_UNREACH_HOST;
1517: break;
1518:
1519: case EMSGSIZE:
1520: type = ICMP_UNREACH;
1521: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1522: #ifndef IPSEC
1.13 mycroft 1523: if (ipforward_rt.ro_rt)
1524: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1525: #else
1526: /*
1527: * If the packet is routed over IPsec tunnel, tell the
1528: * originator the tunnel MTU.
1529: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1530: * XXX quickhack!!!
1531: */
1532: if (ipforward_rt.ro_rt) {
1533: struct secpolicy *sp;
1534: int ipsecerror;
1.95 itojun 1535: size_t ipsechdr;
1.89 itojun 1536: struct route *ro;
1537:
1538: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1539: IPSEC_DIR_OUTBOUND,
1540: IP_FORWARDING,
1541: &ipsecerror);
1.89 itojun 1542:
1543: if (sp == NULL)
1544: destifp = ipforward_rt.ro_rt->rt_ifp;
1545: else {
1546: /* count IPsec header size */
1.95 itojun 1547: ipsechdr = ipsec4_hdrsiz(mcopy,
1548: IPSEC_DIR_OUTBOUND,
1549: NULL);
1.89 itojun 1550:
1551: /*
1552: * find the correct route for outer IPv4
1553: * header, compute tunnel MTU.
1554: *
1555: * XXX BUG ALERT
1556: * The "dummyifp" code relies upon the fact
1557: * that icmp_error() touches only ifp->if_mtu.
1558: */
1559: /*XXX*/
1560: destifp = NULL;
1561: if (sp->req != NULL
1.95 itojun 1562: && sp->req->sav != NULL
1563: && sp->req->sav->sah != NULL) {
1564: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1565: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1566: dummyifp.if_mtu =
1567: ro->ro_rt->rt_ifp->if_mtu;
1568: dummyifp.if_mtu -= ipsechdr;
1569: destifp = &dummyifp;
1570: }
1571: }
1572:
1573: key_freesp(sp);
1574: }
1575: }
1576: #endif /*IPSEC*/
1.1 cgd 1577: ipstat.ips_cantfrag++;
1578: break;
1579:
1580: case ENOBUFS:
1581: type = ICMP_SOURCEQUENCH;
1582: code = 0;
1583: break;
1584: }
1.13 mycroft 1585: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1586: }
1587:
1588: void
1589: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1590: struct inpcb *inp;
1591: struct mbuf **mp;
1592: struct ip *ip;
1593: struct mbuf *m;
1.44 thorpej 1594: {
1595:
1596: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1597: struct timeval tv;
1598:
1599: microtime(&tv);
1600: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1601: SCM_TIMESTAMP, SOL_SOCKET);
1602: if (*mp)
1603: mp = &(*mp)->m_next;
1604: }
1605: if (inp->inp_flags & INP_RECVDSTADDR) {
1606: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1607: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1608: if (*mp)
1609: mp = &(*mp)->m_next;
1610: }
1611: #ifdef notyet
1612: /*
1613: * XXX
1614: * Moving these out of udp_input() made them even more broken
1615: * than they already were.
1616: * - fenner@parc.xerox.com
1617: */
1618: /* options were tossed already */
1619: if (inp->inp_flags & INP_RECVOPTS) {
1620: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1621: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1622: if (*mp)
1623: mp = &(*mp)->m_next;
1624: }
1625: /* ip_srcroute doesn't do what we want here, need to fix */
1626: if (inp->inp_flags & INP_RECVRETOPTS) {
1627: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1628: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1629: if (*mp)
1630: mp = &(*mp)->m_next;
1631: }
1632: #endif
1633: if (inp->inp_flags & INP_RECVIF) {
1634: struct sockaddr_dl sdl;
1635:
1636: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1637: sdl.sdl_family = AF_LINK;
1638: sdl.sdl_index = m->m_pkthdr.rcvif ?
1639: m->m_pkthdr.rcvif->if_index : 0;
1640: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1641: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1642: IP_RECVIF, IPPROTO_IP);
1643: if (*mp)
1644: mp = &(*mp)->m_next;
1645: }
1.13 mycroft 1646: }
1647:
1648: int
1649: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1650: int *name;
1651: u_int namelen;
1652: void *oldp;
1653: size_t *oldlenp;
1654: void *newp;
1655: size_t newlen;
1656: {
1.88 sommerfe 1657: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1658:
1.54 lukem 1659: int error, old;
1660:
1.13 mycroft 1661: /* All sysctl names at this level are terminal. */
1662: if (namelen != 1)
1663: return (ENOTDIR);
1664:
1665: switch (name[0]) {
1666: case IPCTL_FORWARDING:
1667: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1668: case IPCTL_SENDREDIRECTS:
1669: return (sysctl_int(oldp, oldlenp, newp, newlen,
1670: &ipsendredirects));
1671: case IPCTL_DEFTTL:
1672: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1673: #ifdef notyet
1674: case IPCTL_DEFMTU:
1675: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1676: #endif
1.26 thorpej 1677: case IPCTL_FORWSRCRT:
1.47 cjs 1678: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1679: if (securelevel > 0)
1.46 cjs 1680: return (sysctl_rdint(oldp, oldlenp, newp,
1681: ip_forwsrcrt));
1682: else
1683: return (sysctl_int(oldp, oldlenp, newp, newlen,
1684: &ip_forwsrcrt));
1.27 thorpej 1685: case IPCTL_DIRECTEDBCAST:
1686: return (sysctl_int(oldp, oldlenp, newp, newlen,
1687: &ip_directedbcast));
1.47 cjs 1688: case IPCTL_ALLOWSRCRT:
1689: return (sysctl_int(oldp, oldlenp, newp, newlen,
1690: &ip_allowsrcrt));
1.52 thorpej 1691: case IPCTL_SUBNETSARELOCAL:
1692: return (sysctl_int(oldp, oldlenp, newp, newlen,
1693: &subnetsarelocal));
1.53 kml 1694: case IPCTL_MTUDISC:
1.60 kml 1695: error = sysctl_int(oldp, oldlenp, newp, newlen,
1696: &ip_mtudisc);
1697: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1698: ip_mtudisc_timeout_q =
1699: rt_timer_queue_create(ip_mtudisc_timeout);
1700: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1701: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1702: ip_mtudisc_timeout_q = NULL;
1703: }
1704: return error;
1.54 lukem 1705: case IPCTL_ANONPORTMIN:
1706: old = anonportmin;
1707: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1708: if (anonportmin >= anonportmax || anonportmin < 0
1709: || anonportmin > 65535
1.54 lukem 1710: #ifndef IPNOPRIVPORTS
1711: || anonportmin < IPPORT_RESERVED
1712: #endif
1713: ) {
1714: anonportmin = old;
1715: return (EINVAL);
1716: }
1717: return (error);
1718: case IPCTL_ANONPORTMAX:
1719: old = anonportmax;
1720: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1721: if (anonportmin >= anonportmax || anonportmax < 0
1722: || anonportmax > 65535
1.54 lukem 1723: #ifndef IPNOPRIVPORTS
1724: || anonportmax < IPPORT_RESERVED
1725: #endif
1726: ) {
1727: anonportmax = old;
1728: return (EINVAL);
1729: }
1.60 kml 1730: return (error);
1731: case IPCTL_MTUDISCTIMEOUT:
1732: error = sysctl_int(oldp, oldlenp, newp, newlen,
1733: &ip_mtudisc_timeout);
1734: if (ip_mtudisc_timeout_q != NULL)
1735: rt_timer_queue_change(ip_mtudisc_timeout_q,
1736: ip_mtudisc_timeout);
1.54 lukem 1737: return (error);
1.65 matt 1738: #ifdef GATEWAY
1739: case IPCTL_MAXFLOWS:
1.67 thorpej 1740: {
1741: int s;
1742:
1.65 matt 1743: error = sysctl_int(oldp, oldlenp, newp, newlen,
1744: &ip_maxflows);
1.67 thorpej 1745: s = splsoftnet();
1.65 matt 1746: ipflow_reap(0);
1.67 thorpej 1747: splx(s);
1.65 matt 1748: return (error);
1.67 thorpej 1749: }
1.89 itojun 1750: #endif
1.90 itojun 1751: case IPCTL_HOSTZEROBROADCAST:
1752: return (sysctl_int(oldp, oldlenp, newp, newlen,
1753: &hostzeroisbroadcast));
1.89 itojun 1754: #if NGIF > 0
1755: case IPCTL_GIF_TTL:
1756: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1757: &ip_gif_ttl));
1.117 tron 1758: #endif
1759:
1760: #ifndef IPNOPRIVPORTS
1761: case IPCTL_LOWPORTMIN:
1762: old = lowportmin;
1763: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1764: if (lowportmin >= lowportmax
1765: || lowportmin > IPPORT_RESERVEDMAX
1766: || lowportmin < IPPORT_RESERVEDMIN
1767: ) {
1768: lowportmin = old;
1769: return (EINVAL);
1770: }
1771: return (error);
1772: case IPCTL_LOWPORTMAX:
1773: old = lowportmax;
1774: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1775: if (lowportmin >= lowportmax
1776: || lowportmax > IPPORT_RESERVEDMAX
1777: || lowportmax < IPPORT_RESERVEDMIN
1778: ) {
1779: lowportmax = old;
1780: return (EINVAL);
1781: }
1782: return (error);
1.65 matt 1783: #endif
1.88 sommerfe 1784:
1.13 mycroft 1785: default:
1786: return (EOPNOTSUPP);
1787: }
1788: /* NOTREACHED */
1.1 cgd 1789: }
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