Annotation of src/sys/netinet/ip_input.c, Revision 1.130
1.130 ! itojun 1: /* $NetBSD: ip_input.c,v 1.129 2001/03/02 02:05:36 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)) {
1.130 ! itojun 417: ipstat.ips_badaddr++;
1.85 hwr 418: goto bad;
1.129 itojun 419: }
420:
421: /* 127/8 must not appear on wire - RFC1122 */
422: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
423: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 ! itojun 424: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
! 425: ipstat.ips_badaddr++;
1.129 itojun 426: goto bad;
1.130 ! itojun 427: }
1.85 hwr 428: }
429:
1.78 mycroft 430: if (in_cksum(m, hlen) != 0) {
1.1 cgd 431: ipstat.ips_badsum++;
432: goto bad;
433: }
434:
1.121 thorpej 435: /* Retrieve the packet length. */
436: len = ntohs(ip->ip_len);
1.81 proff 437:
438: /*
439: * Check for additional length bogosity
440: */
1.84 proff 441: if (len < hlen) {
1.81 proff 442: ipstat.ips_badlen++;
443: goto bad;
444: }
1.1 cgd 445:
446: /*
447: * Check that the amount of data in the buffers
448: * is as at least much as the IP header would have us expect.
449: * Trim mbufs if longer than we expect.
450: * Drop packet if shorter than we expect.
451: */
1.35 mycroft 452: if (m->m_pkthdr.len < len) {
1.1 cgd 453: ipstat.ips_tooshort++;
454: goto bad;
455: }
1.35 mycroft 456: if (m->m_pkthdr.len > len) {
1.1 cgd 457: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 458: m->m_len = len;
459: m->m_pkthdr.len = len;
1.1 cgd 460: } else
1.35 mycroft 461: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 462: }
463:
1.94 itojun 464: #ifdef IPSEC
465: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
466: m->m_flags &= ~M_CANFASTFWD;
467: #else
1.64 thorpej 468: /*
469: * Assume that we can create a fast-forward IP flow entry
470: * based on this packet.
471: */
472: m->m_flags |= M_CANFASTFWD;
1.94 itojun 473: #endif
1.64 thorpej 474:
1.36 mrg 475: #ifdef PFIL_HOOKS
1.33 mrg 476: /*
1.64 thorpej 477: * Run through list of hooks for input packets. If there are any
478: * filters which require that additional packets in the flow are
479: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
480: * Note that filters must _never_ set this flag, as another filter
481: * in the list may have previously cleared it.
1.33 mrg 482: */
1.127 itojun 483: /*
484: * let ipfilter look at packet on the wire,
485: * not the decapsulated packet.
486: */
487: #ifdef IPSEC
488: if (!ipsec_gethist(m, NULL))
489: #else
490: if (1)
491: #endif
492: {
493: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
494: PFIL_IN) != 0)
1.121 thorpej 495: return;
1.127 itojun 496: if (m == NULL)
497: return;
498: ip = mtod(m, struct ip *);
499: }
1.36 mrg 500: #endif /* PFIL_HOOKS */
1.123 thorpej 501:
502: #ifdef ALTQ
503: /* XXX Temporary until ALTQ is changed to use a pfil hook */
504: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
505: /* packet dropped by traffic conditioner */
506: return;
507: }
508: #endif
1.121 thorpej 509:
510: /*
511: * Convert fields to host representation.
512: */
513: NTOHS(ip->ip_len);
514: NTOHS(ip->ip_off);
1.33 mrg 515:
1.1 cgd 516: /*
517: * Process options and, if not destined for us,
518: * ship it on. ip_dooptions returns 1 when an
519: * error was detected (causing an icmp message
520: * to be sent and the original packet to be freed).
521: */
522: ip_nhops = 0; /* for source routed packets */
523: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 524: return;
1.1 cgd 525:
526: /*
527: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 528: *
529: * Traditional 4.4BSD did not consult IFF_UP at all.
530: * The behavior here is to treat addresses on !IFF_UP interface
531: * as not mine.
1.1 cgd 532: */
1.100 itojun 533: downmatch = 0;
1.97 itojun 534: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
535: ia != NULL;
536: ia = ia->ia_hash.le_next) {
537: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
538: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
539: break;
1.100 itojun 540: else
541: downmatch++;
1.97 itojun 542: }
543: }
1.86 thorpej 544: if (ia != NULL)
545: goto ours;
1.57 tls 546: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
547: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
548: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
549: if (ifa->ifa_addr->sa_family != AF_INET) continue;
550: ia = ifatoia(ifa);
1.35 mycroft 551: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
552: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 553: /*
554: * Look for all-0's host part (old broadcast addr),
555: * either for subnet or net.
556: */
557: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 558: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 559: goto ours;
1.57 tls 560: /*
561: * An interface with IP address zero accepts
562: * all packets that arrive on that interface.
563: */
564: if (in_nullhost(ia->ia_addr.sin_addr))
565: goto ours;
1.1 cgd 566: }
567: }
1.18 mycroft 568: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 569: struct in_multi *inm;
570: #ifdef MROUTING
571: extern struct socket *ip_mrouter;
1.10 brezak 572:
573: if (m->m_flags & M_EXT) {
574: if ((m = m_pullup(m, hlen)) == 0) {
575: ipstat.ips_toosmall++;
1.89 itojun 576: return;
1.10 brezak 577: }
578: ip = mtod(m, struct ip *);
579: }
1.4 hpeyerl 580:
581: if (ip_mrouter) {
582: /*
583: * If we are acting as a multicast router, all
584: * incoming multicast packets are passed to the
585: * kernel-level multicast forwarding function.
586: * The packet is returned (relatively) intact; if
587: * ip_mforward() returns a non-zero value, the packet
588: * must be discarded, else it may be accepted below.
589: *
590: * (The IP ident field is put in the same byte order
591: * as expected when ip_mforward() is called from
592: * ip_output().)
593: */
1.13 mycroft 594: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
595: ipstat.ips_cantforward++;
1.4 hpeyerl 596: m_freem(m);
1.89 itojun 597: return;
1.4 hpeyerl 598: }
599:
600: /*
601: * The process-level routing demon needs to receive
602: * all multicast IGMP packets, whether or not this
603: * host belongs to their destination groups.
604: */
605: if (ip->ip_p == IPPROTO_IGMP)
606: goto ours;
1.13 mycroft 607: ipstat.ips_forward++;
1.4 hpeyerl 608: }
609: #endif
610: /*
611: * See if we belong to the destination multicast group on the
612: * arrival interface.
613: */
614: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
615: if (inm == NULL) {
1.13 mycroft 616: ipstat.ips_cantforward++;
1.4 hpeyerl 617: m_freem(m);
1.89 itojun 618: return;
1.4 hpeyerl 619: }
620: goto ours;
621: }
1.19 mycroft 622: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 623: in_nullhost(ip->ip_dst))
1.1 cgd 624: goto ours;
625:
626: /*
627: * Not for us; forward if possible and desirable.
628: */
629: if (ipforwarding == 0) {
630: ipstat.ips_cantforward++;
631: m_freem(m);
1.100 itojun 632: } else {
633: /*
634: * If ip_dst matched any of my address on !IFF_UP interface,
635: * and there's no IFF_UP interface that matches ip_dst,
636: * send icmp unreach. Forwarding it will result in in-kernel
637: * forwarding loop till TTL goes to 0.
638: */
639: if (downmatch) {
640: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
641: ipstat.ips_cantforward++;
642: return;
643: }
1.1 cgd 644: ip_forward(m, 0);
1.100 itojun 645: }
1.89 itojun 646: return;
1.1 cgd 647:
648: ours:
649: /*
650: * If offset or IP_MF are set, must reassemble.
651: * Otherwise, nothing need be done.
652: * (We could look in the reassembly queue to see
653: * if the packet was previously fragmented,
654: * but it's not worth the time; just let them time out.)
655: */
1.37 perry 656: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 657: /*
658: * Look for queue of fragments
659: * of this datagram.
660: */
1.75 thorpej 661: IPQ_LOCK();
1.25 cgd 662: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 663: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 664: in_hosteq(ip->ip_src, fp->ipq_src) &&
665: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 666: ip->ip_p == fp->ipq_p)
667: goto found;
668: fp = 0;
669: found:
670:
671: /*
672: * Adjust ip_len to not reflect header,
1.25 cgd 673: * set ipqe_mff if more fragments are expected,
1.1 cgd 674: * convert offset of this to bytes.
675: */
676: ip->ip_len -= hlen;
1.25 cgd 677: mff = (ip->ip_off & IP_MF) != 0;
678: if (mff) {
1.16 cgd 679: /*
680: * Make sure that fragments have a data length
681: * that's a non-zero multiple of 8 bytes.
682: */
1.17 cgd 683: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 684: ipstat.ips_badfrags++;
1.75 thorpej 685: IPQ_UNLOCK();
1.16 cgd 686: goto bad;
687: }
688: }
1.1 cgd 689: ip->ip_off <<= 3;
690:
691: /*
692: * If datagram marked as having more fragments
693: * or if this is not the first fragment,
694: * attempt reassembly; if it succeeds, proceed.
695: */
1.25 cgd 696: if (mff || ip->ip_off) {
1.1 cgd 697: ipstat.ips_fragments++;
1.72 thorpej 698: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 699: if (ipqe == NULL) {
700: ipstat.ips_rcvmemdrop++;
1.75 thorpej 701: IPQ_UNLOCK();
1.25 cgd 702: goto bad;
703: }
704: ipqe->ipqe_mff = mff;
1.50 thorpej 705: ipqe->ipqe_m = m;
1.25 cgd 706: ipqe->ipqe_ip = ip;
1.50 thorpej 707: m = ip_reass(ipqe, fp);
1.75 thorpej 708: if (m == 0) {
709: IPQ_UNLOCK();
1.89 itojun 710: return;
1.75 thorpej 711: }
1.13 mycroft 712: ipstat.ips_reassembled++;
1.50 thorpej 713: ip = mtod(m, struct ip *);
1.74 thorpej 714: hlen = ip->ip_hl << 2;
1.79 mycroft 715: ip->ip_len += hlen;
1.1 cgd 716: } else
717: if (fp)
718: ip_freef(fp);
1.75 thorpej 719: IPQ_UNLOCK();
1.79 mycroft 720: }
1.128 itojun 721:
722: #ifdef IPSEC
723: /*
724: * enforce IPsec policy checking if we are seeing last header.
725: * note that we do not visit this with protocols with pcb layer
726: * code - like udp/tcp/raw ip.
727: */
728: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
729: ipsec4_in_reject(m, NULL)) {
730: ipsecstat.in_polvio++;
731: goto bad;
732: }
733: #endif
1.1 cgd 734:
735: /*
736: * Switch out to protocol's input routine.
737: */
1.82 aidan 738: #if IFA_STATS
1.122 itojun 739: if (ia && ip)
740: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 741: #endif
1.1 cgd 742: ipstat.ips_delivered++;
1.89 itojun 743: {
744: int off = hlen, nh = ip->ip_p;
745:
746: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
747: return;
748: }
1.1 cgd 749: bad:
750: m_freem(m);
751: }
752:
753: /*
754: * Take incoming datagram fragment and try to
755: * reassemble it into whole datagram. If a chain for
756: * reassembly of this datagram already exists, then it
757: * is given as fp; otherwise have to make a chain.
758: */
1.50 thorpej 759: struct mbuf *
1.25 cgd 760: ip_reass(ipqe, fp)
1.109 augustss 761: struct ipqent *ipqe;
762: struct ipq *fp;
1.1 cgd 763: {
1.109 augustss 764: struct mbuf *m = ipqe->ipqe_m;
765: struct ipqent *nq, *p, *q;
1.25 cgd 766: struct ip *ip;
1.1 cgd 767: struct mbuf *t;
1.25 cgd 768: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 769: int i, next;
770:
1.75 thorpej 771: IPQ_LOCK_CHECK();
772:
1.1 cgd 773: /*
774: * Presence of header sizes in mbufs
775: * would confuse code below.
776: */
777: m->m_data += hlen;
778: m->m_len -= hlen;
779:
780: /*
781: * If first fragment to arrive, create a reassembly queue.
782: */
783: if (fp == 0) {
1.50 thorpej 784: MALLOC(fp, struct ipq *, sizeof (struct ipq),
785: M_FTABLE, M_NOWAIT);
786: if (fp == NULL)
1.1 cgd 787: goto dropfrag;
1.25 cgd 788: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 789: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 790: fp->ipq_p = ipqe->ipqe_ip->ip_p;
791: fp->ipq_id = ipqe->ipqe_ip->ip_id;
792: LIST_INIT(&fp->ipq_fragq);
793: fp->ipq_src = ipqe->ipqe_ip->ip_src;
794: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
795: p = NULL;
1.1 cgd 796: goto insert;
797: }
798:
799: /*
800: * Find a segment which begins after this one does.
801: */
1.25 cgd 802: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
803: p = q, q = q->ipqe_q.le_next)
804: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 805: break;
806:
807: /*
808: * If there is a preceding segment, it may provide some of
809: * our data already. If so, drop the data from the incoming
810: * segment. If it provides all of our data, drop us.
811: */
1.25 cgd 812: if (p != NULL) {
813: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
814: ipqe->ipqe_ip->ip_off;
1.1 cgd 815: if (i > 0) {
1.25 cgd 816: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 817: goto dropfrag;
1.50 thorpej 818: m_adj(ipqe->ipqe_m, i);
1.25 cgd 819: ipqe->ipqe_ip->ip_off += i;
820: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 821: }
822: }
823:
824: /*
825: * While we overlap succeeding segments trim them or,
826: * if they are completely covered, dequeue them.
827: */
1.25 cgd 828: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
829: q->ipqe_ip->ip_off; q = nq) {
830: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
831: q->ipqe_ip->ip_off;
832: if (i < q->ipqe_ip->ip_len) {
833: q->ipqe_ip->ip_len -= i;
834: q->ipqe_ip->ip_off += i;
1.50 thorpej 835: m_adj(q->ipqe_m, i);
1.1 cgd 836: break;
837: }
1.25 cgd 838: nq = q->ipqe_q.le_next;
1.50 thorpej 839: m_freem(q->ipqe_m);
1.25 cgd 840: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 841: pool_put(&ipqent_pool, q);
1.1 cgd 842: }
843:
844: insert:
845: /*
846: * Stick new segment in its place;
847: * check for complete reassembly.
848: */
1.25 cgd 849: if (p == NULL) {
850: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
851: } else {
852: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
853: }
1.1 cgd 854: next = 0;
1.25 cgd 855: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
856: p = q, q = q->ipqe_q.le_next) {
857: if (q->ipqe_ip->ip_off != next)
1.1 cgd 858: return (0);
1.25 cgd 859: next += q->ipqe_ip->ip_len;
1.1 cgd 860: }
1.25 cgd 861: if (p->ipqe_mff)
1.1 cgd 862: return (0);
863:
864: /*
1.41 thorpej 865: * Reassembly is complete. Check for a bogus message size and
866: * concatenate fragments.
1.1 cgd 867: */
1.25 cgd 868: q = fp->ipq_fragq.lh_first;
869: ip = q->ipqe_ip;
1.41 thorpej 870: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
871: ipstat.ips_toolong++;
872: ip_freef(fp);
873: return (0);
874: }
1.50 thorpej 875: m = q->ipqe_m;
1.1 cgd 876: t = m->m_next;
877: m->m_next = 0;
878: m_cat(m, t);
1.25 cgd 879: nq = q->ipqe_q.le_next;
1.72 thorpej 880: pool_put(&ipqent_pool, q);
1.25 cgd 881: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 882: t = q->ipqe_m;
1.25 cgd 883: nq = q->ipqe_q.le_next;
1.72 thorpej 884: pool_put(&ipqent_pool, q);
1.1 cgd 885: m_cat(m, t);
886: }
887:
888: /*
889: * Create header for new ip packet by
890: * modifying header of first packet;
891: * dequeue and discard fragment reassembly header.
892: * Make header visible.
893: */
894: ip->ip_len = next;
1.25 cgd 895: ip->ip_src = fp->ipq_src;
896: ip->ip_dst = fp->ipq_dst;
897: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 898: FREE(fp, M_FTABLE);
1.1 cgd 899: m->m_len += (ip->ip_hl << 2);
900: m->m_data -= (ip->ip_hl << 2);
901: /* some debugging cruft by sklower, below, will go away soon */
902: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 903: int plen = 0;
1.50 thorpej 904: for (t = m; t; t = t->m_next)
905: plen += t->m_len;
906: m->m_pkthdr.len = plen;
1.1 cgd 907: }
1.50 thorpej 908: return (m);
1.1 cgd 909:
910: dropfrag:
911: ipstat.ips_fragdropped++;
912: m_freem(m);
1.72 thorpej 913: pool_put(&ipqent_pool, ipqe);
1.1 cgd 914: return (0);
915: }
916:
917: /*
918: * Free a fragment reassembly header and all
919: * associated datagrams.
920: */
1.8 mycroft 921: void
1.1 cgd 922: ip_freef(fp)
923: struct ipq *fp;
924: {
1.109 augustss 925: struct ipqent *q, *p;
1.1 cgd 926:
1.75 thorpej 927: IPQ_LOCK_CHECK();
928:
1.25 cgd 929: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
930: p = q->ipqe_q.le_next;
1.50 thorpej 931: m_freem(q->ipqe_m);
1.25 cgd 932: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 933: pool_put(&ipqent_pool, q);
1.1 cgd 934: }
1.25 cgd 935: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 936: FREE(fp, M_FTABLE);
1.1 cgd 937: }
938:
939: /*
940: * IP timer processing;
941: * if a timer expires on a reassembly
942: * queue, discard it.
943: */
1.8 mycroft 944: void
1.1 cgd 945: ip_slowtimo()
946: {
1.109 augustss 947: struct ipq *fp, *nfp;
1.24 mycroft 948: int s = splsoftnet();
1.1 cgd 949:
1.75 thorpej 950: IPQ_LOCK();
1.25 cgd 951: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
952: nfp = fp->ipq_q.le_next;
953: if (--fp->ipq_ttl == 0) {
1.1 cgd 954: ipstat.ips_fragtimeout++;
1.25 cgd 955: ip_freef(fp);
1.1 cgd 956: }
957: }
1.75 thorpej 958: IPQ_UNLOCK();
1.63 matt 959: #ifdef GATEWAY
960: ipflow_slowtimo();
961: #endif
1.1 cgd 962: splx(s);
963: }
964:
965: /*
966: * Drain off all datagram fragments.
967: */
1.8 mycroft 968: void
1.1 cgd 969: ip_drain()
970: {
971:
1.75 thorpej 972: /*
973: * We may be called from a device's interrupt context. If
974: * the ipq is already busy, just bail out now.
975: */
976: if (ipq_lock_try() == 0)
977: return;
978:
1.25 cgd 979: while (ipq.lh_first != NULL) {
1.1 cgd 980: ipstat.ips_fragdropped++;
1.25 cgd 981: ip_freef(ipq.lh_first);
1.1 cgd 982: }
1.75 thorpej 983:
984: IPQ_UNLOCK();
1.1 cgd 985: }
986:
987: /*
988: * Do option processing on a datagram,
989: * possibly discarding it if bad options are encountered,
990: * or forwarding it if source-routed.
991: * Returns 1 if packet has been forwarded/freed,
992: * 0 if the packet should be processed further.
993: */
1.8 mycroft 994: int
1.1 cgd 995: ip_dooptions(m)
996: struct mbuf *m;
997: {
1.109 augustss 998: struct ip *ip = mtod(m, struct ip *);
999: u_char *cp, *cp0;
1000: struct ip_timestamp *ipt;
1001: struct in_ifaddr *ia;
1.1 cgd 1002: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1003: struct in_addr dst;
1.1 cgd 1004: n_time ntime;
1005:
1.13 mycroft 1006: dst = ip->ip_dst;
1.1 cgd 1007: cp = (u_char *)(ip + 1);
1008: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1009: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1010: opt = cp[IPOPT_OPTVAL];
1011: if (opt == IPOPT_EOL)
1012: break;
1013: if (opt == IPOPT_NOP)
1014: optlen = 1;
1015: else {
1.113 itojun 1016: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1017: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1018: goto bad;
1019: }
1.1 cgd 1020: optlen = cp[IPOPT_OLEN];
1.114 itojun 1021: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1022: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1023: goto bad;
1024: }
1025: }
1026: switch (opt) {
1027:
1028: default:
1029: break;
1030:
1031: /*
1032: * Source routing with record.
1033: * Find interface with current destination address.
1034: * If none on this machine then drop if strictly routed,
1035: * or do nothing if loosely routed.
1036: * Record interface address and bring up next address
1037: * component. If strictly routed make sure next
1038: * address is on directly accessible net.
1039: */
1040: case IPOPT_LSRR:
1041: case IPOPT_SSRR:
1.47 cjs 1042: if (ip_allowsrcrt == 0) {
1043: type = ICMP_UNREACH;
1044: code = ICMP_UNREACH_NET_PROHIB;
1045: goto bad;
1046: }
1.114 itojun 1047: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1048: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1049: goto bad;
1050: }
1.1 cgd 1051: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1052: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1053: goto bad;
1054: }
1055: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1056: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1057: if (ia == 0) {
1058: if (opt == IPOPT_SSRR) {
1059: type = ICMP_UNREACH;
1060: code = ICMP_UNREACH_SRCFAIL;
1061: goto bad;
1062: }
1063: /*
1064: * Loose routing, and not at next destination
1065: * yet; nothing to do except forward.
1066: */
1067: break;
1068: }
1069: off--; /* 0 origin */
1.112 sommerfe 1070: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1071: /*
1072: * End of source route. Should be for us.
1073: */
1074: save_rte(cp, ip->ip_src);
1075: break;
1076: }
1077: /*
1078: * locate outgoing interface
1079: */
1080: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1081: sizeof(ipaddr.sin_addr));
1.96 thorpej 1082: if (opt == IPOPT_SSRR)
1083: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1084: else
1.1 cgd 1085: ia = ip_rtaddr(ipaddr.sin_addr);
1086: if (ia == 0) {
1087: type = ICMP_UNREACH;
1088: code = ICMP_UNREACH_SRCFAIL;
1089: goto bad;
1090: }
1091: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1092: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1093: (caddr_t)(cp + off), sizeof(struct in_addr));
1094: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1095: /*
1096: * Let ip_intr's mcast routing check handle mcast pkts
1097: */
1.18 mycroft 1098: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1099: break;
1100:
1101: case IPOPT_RR:
1.114 itojun 1102: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1103: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1104: goto bad;
1105: }
1.1 cgd 1106: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1107: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1108: goto bad;
1109: }
1110: /*
1111: * If no space remains, ignore.
1112: */
1113: off--; /* 0 origin */
1.112 sommerfe 1114: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1115: break;
1116: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1117: sizeof(ipaddr.sin_addr));
1118: /*
1119: * locate outgoing interface; if we're the destination,
1120: * use the incoming interface (should be same).
1121: */
1.96 thorpej 1122: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1123: == NULL &&
1124: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1125: type = ICMP_UNREACH;
1126: code = ICMP_UNREACH_HOST;
1127: goto bad;
1128: }
1.20 mycroft 1129: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1130: (caddr_t)(cp + off), sizeof(struct in_addr));
1131: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1132: break;
1133:
1134: case IPOPT_TS:
1135: code = cp - (u_char *)ip;
1136: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1137: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1138: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1139: goto bad;
1.114 itojun 1140: }
1141: if (ipt->ipt_ptr < 5) {
1142: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1143: goto bad;
1144: }
1.15 cgd 1145: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1146: if (++ipt->ipt_oflw == 0) {
1147: code = (u_char *)&ipt->ipt_ptr -
1148: (u_char *)ip;
1.1 cgd 1149: goto bad;
1.114 itojun 1150: }
1.1 cgd 1151: break;
1152: }
1.104 thorpej 1153: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1154: switch (ipt->ipt_flg) {
1155:
1156: case IPOPT_TS_TSONLY:
1157: break;
1158:
1159: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1160: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1161: sizeof(struct in_addr) > ipt->ipt_len) {
1162: code = (u_char *)&ipt->ipt_ptr -
1163: (u_char *)ip;
1.1 cgd 1164: goto bad;
1.114 itojun 1165: }
1.13 mycroft 1166: ipaddr.sin_addr = dst;
1.96 thorpej 1167: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1168: m->m_pkthdr.rcvif));
1.13 mycroft 1169: if (ia == 0)
1170: continue;
1.104 thorpej 1171: bcopy(&ia->ia_addr.sin_addr,
1172: cp0, sizeof(struct in_addr));
1.1 cgd 1173: ipt->ipt_ptr += sizeof(struct in_addr);
1174: break;
1175:
1176: case IPOPT_TS_PRESPEC:
1.66 thorpej 1177: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1178: sizeof(struct in_addr) > ipt->ipt_len) {
1179: code = (u_char *)&ipt->ipt_ptr -
1180: (u_char *)ip;
1.1 cgd 1181: goto bad;
1.114 itojun 1182: }
1.104 thorpej 1183: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1184: sizeof(struct in_addr));
1.96 thorpej 1185: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1186: == NULL)
1.1 cgd 1187: continue;
1188: ipt->ipt_ptr += sizeof(struct in_addr);
1189: break;
1190:
1191: default:
1.114 itojun 1192: /* XXX can't take &ipt->ipt_flg */
1193: code = (u_char *)&ipt->ipt_ptr -
1194: (u_char *)ip + 1;
1.1 cgd 1195: goto bad;
1196: }
1197: ntime = iptime();
1.107 thorpej 1198: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1199: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1200: sizeof(n_time));
1201: ipt->ipt_ptr += sizeof(n_time);
1202: }
1203: }
1204: if (forward) {
1.26 thorpej 1205: if (ip_forwsrcrt == 0) {
1206: type = ICMP_UNREACH;
1207: code = ICMP_UNREACH_SRCFAIL;
1208: goto bad;
1209: }
1.1 cgd 1210: ip_forward(m, 1);
1211: return (1);
1.13 mycroft 1212: }
1213: return (0);
1.1 cgd 1214: bad:
1.13 mycroft 1215: icmp_error(m, type, code, 0, 0);
1216: ipstat.ips_badoptions++;
1.1 cgd 1217: return (1);
1218: }
1219:
1220: /*
1221: * Given address of next destination (final or next hop),
1222: * return internet address info of interface to be used to get there.
1223: */
1224: struct in_ifaddr *
1225: ip_rtaddr(dst)
1226: struct in_addr dst;
1227: {
1.109 augustss 1228: struct sockaddr_in *sin;
1.1 cgd 1229:
1.19 mycroft 1230: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1231:
1.35 mycroft 1232: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1233: if (ipforward_rt.ro_rt) {
1234: RTFREE(ipforward_rt.ro_rt);
1235: ipforward_rt.ro_rt = 0;
1236: }
1237: sin->sin_family = AF_INET;
1238: sin->sin_len = sizeof(*sin);
1239: sin->sin_addr = dst;
1240:
1241: rtalloc(&ipforward_rt);
1242: }
1243: if (ipforward_rt.ro_rt == 0)
1244: return ((struct in_ifaddr *)0);
1.19 mycroft 1245: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1246: }
1247:
1248: /*
1249: * Save incoming source route for use in replies,
1250: * to be picked up later by ip_srcroute if the receiver is interested.
1251: */
1.13 mycroft 1252: void
1.1 cgd 1253: save_rte(option, dst)
1254: u_char *option;
1255: struct in_addr dst;
1256: {
1257: unsigned olen;
1258:
1259: olen = option[IPOPT_OLEN];
1260: #ifdef DIAGNOSTIC
1261: if (ipprintfs)
1.39 christos 1262: printf("save_rte: olen %d\n", olen);
1.89 itojun 1263: #endif /* 0 */
1.1 cgd 1264: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1265: return;
1266: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1267: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1268: ip_srcrt.dst = dst;
1269: }
1270:
1271: /*
1272: * Retrieve incoming source route for use in replies,
1273: * in the same form used by setsockopt.
1274: * The first hop is placed before the options, will be removed later.
1275: */
1276: struct mbuf *
1277: ip_srcroute()
1278: {
1.109 augustss 1279: struct in_addr *p, *q;
1280: struct mbuf *m;
1.1 cgd 1281:
1282: if (ip_nhops == 0)
1283: return ((struct mbuf *)0);
1284: m = m_get(M_DONTWAIT, MT_SOOPTS);
1285: if (m == 0)
1286: return ((struct mbuf *)0);
1287:
1.13 mycroft 1288: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1289:
1290: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1291: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1292: OPTSIZ;
1293: #ifdef DIAGNOSTIC
1294: if (ipprintfs)
1.39 christos 1295: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1296: #endif
1297:
1298: /*
1299: * First save first hop for return route
1300: */
1301: p = &ip_srcrt.route[ip_nhops - 1];
1302: *(mtod(m, struct in_addr *)) = *p--;
1303: #ifdef DIAGNOSTIC
1304: if (ipprintfs)
1.39 christos 1305: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1306: #endif
1307:
1308: /*
1309: * Copy option fields and padding (nop) to mbuf.
1310: */
1311: ip_srcrt.nop = IPOPT_NOP;
1312: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1313: bcopy((caddr_t)&ip_srcrt.nop,
1314: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1315: q = (struct in_addr *)(mtod(m, caddr_t) +
1316: sizeof(struct in_addr) + OPTSIZ);
1317: #undef OPTSIZ
1318: /*
1319: * Record return path as an IP source route,
1320: * reversing the path (pointers are now aligned).
1321: */
1322: while (p >= ip_srcrt.route) {
1323: #ifdef DIAGNOSTIC
1324: if (ipprintfs)
1.39 christos 1325: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1326: #endif
1327: *q++ = *p--;
1328: }
1329: /*
1330: * Last hop goes to final destination.
1331: */
1332: *q = ip_srcrt.dst;
1333: #ifdef DIAGNOSTIC
1334: if (ipprintfs)
1.39 christos 1335: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1336: #endif
1337: return (m);
1338: }
1339:
1340: /*
1341: * Strip out IP options, at higher
1342: * level protocol in the kernel.
1343: * Second argument is buffer to which options
1344: * will be moved, and return value is their length.
1345: * XXX should be deleted; last arg currently ignored.
1346: */
1.8 mycroft 1347: void
1.1 cgd 1348: ip_stripoptions(m, mopt)
1.109 augustss 1349: struct mbuf *m;
1.1 cgd 1350: struct mbuf *mopt;
1351: {
1.109 augustss 1352: int i;
1.1 cgd 1353: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1354: caddr_t opts;
1.1 cgd 1355: int olen;
1356:
1.79 mycroft 1357: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1358: opts = (caddr_t)(ip + 1);
1359: i = m->m_len - (sizeof (struct ip) + olen);
1360: bcopy(opts + olen, opts, (unsigned)i);
1361: m->m_len -= olen;
1362: if (m->m_flags & M_PKTHDR)
1363: m->m_pkthdr.len -= olen;
1.79 mycroft 1364: ip->ip_len -= olen;
1365: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1366: }
1367:
1.23 mycroft 1368: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1369: 0, 0, 0, 0,
1370: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1371: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1372: EMSGSIZE, EHOSTUNREACH, 0, 0,
1373: 0, 0, 0, 0,
1374: ENOPROTOOPT
1375: };
1376:
1377: /*
1378: * Forward a packet. If some error occurs return the sender
1379: * an icmp packet. Note we can't always generate a meaningful
1380: * icmp message because icmp doesn't have a large enough repertoire
1381: * of codes and types.
1382: *
1383: * If not forwarding, just drop the packet. This could be confusing
1384: * if ipforwarding was zero but some routing protocol was advancing
1385: * us as a gateway to somewhere. However, we must let the routing
1386: * protocol deal with that.
1387: *
1388: * The srcrt parameter indicates whether the packet is being forwarded
1389: * via a source route.
1390: */
1.13 mycroft 1391: void
1.1 cgd 1392: ip_forward(m, srcrt)
1393: struct mbuf *m;
1394: int srcrt;
1395: {
1.109 augustss 1396: struct ip *ip = mtod(m, struct ip *);
1397: struct sockaddr_in *sin;
1398: struct rtentry *rt;
1.28 christos 1399: int error, type = 0, code = 0;
1.1 cgd 1400: struct mbuf *mcopy;
1.13 mycroft 1401: n_long dest;
1402: struct ifnet *destifp;
1.89 itojun 1403: #ifdef IPSEC
1404: struct ifnet dummyifp;
1405: #endif
1.1 cgd 1406:
1.13 mycroft 1407: dest = 0;
1.1 cgd 1408: #ifdef DIAGNOSTIC
1409: if (ipprintfs)
1.70 thorpej 1410: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1411: ntohl(ip->ip_src.s_addr),
1412: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1413: #endif
1.93 sommerfe 1414: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1415: ipstat.ips_cantforward++;
1416: m_freem(m);
1417: return;
1418: }
1419: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1420: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1421: return;
1422: }
1423: ip->ip_ttl -= IPTTLDEC;
1424:
1.19 mycroft 1425: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1426: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1427: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1428: if (ipforward_rt.ro_rt) {
1429: RTFREE(ipforward_rt.ro_rt);
1430: ipforward_rt.ro_rt = 0;
1431: }
1432: sin->sin_family = AF_INET;
1.35 mycroft 1433: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1434: sin->sin_addr = ip->ip_dst;
1435:
1436: rtalloc(&ipforward_rt);
1437: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1438: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1439: return;
1440: }
1441: rt = ipforward_rt.ro_rt;
1442: }
1443:
1444: /*
1.34 mycroft 1445: * Save at most 68 bytes of the packet in case
1.1 cgd 1446: * we need to generate an ICMP message to the src.
1.119 itojun 1447: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1448: */
1.119 itojun 1449: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1450: if (mcopy)
1451: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1452:
1453: /*
1454: * If forwarding packet using same interface that it came in on,
1455: * perhaps should send a redirect to sender to shortcut a hop.
1456: * Only send redirect if source is sending directly to us,
1457: * and if packet was not source routed (or has any options).
1458: * Also, don't send redirect if forwarding using a default route
1459: * or a route modified by a redirect.
1460: */
1461: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1462: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1463: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1464: ipsendredirects && !srcrt) {
1.19 mycroft 1465: if (rt->rt_ifa &&
1466: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1467: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1468: if (rt->rt_flags & RTF_GATEWAY)
1469: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1470: else
1471: dest = ip->ip_dst.s_addr;
1472: /*
1473: * Router requirements says to only send host
1474: * redirects.
1475: */
1476: type = ICMP_REDIRECT;
1477: code = ICMP_REDIRECT_HOST;
1.1 cgd 1478: #ifdef DIAGNOSTIC
1.77 thorpej 1479: if (ipprintfs)
1480: printf("redirect (%d) to %x\n", code,
1481: (u_int32_t)dest);
1.1 cgd 1482: #endif
1483: }
1484: }
1485:
1.89 itojun 1486: #ifdef IPSEC
1.103 itojun 1487: /* Don't lookup socket in forwading case */
1.127 itojun 1488: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1489: #endif
1.27 thorpej 1490: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1491: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1492: if (error)
1493: ipstat.ips_cantforward++;
1494: else {
1495: ipstat.ips_forward++;
1496: if (type)
1497: ipstat.ips_redirectsent++;
1498: else {
1.63 matt 1499: if (mcopy) {
1500: #ifdef GATEWAY
1.64 thorpej 1501: if (mcopy->m_flags & M_CANFASTFWD)
1502: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1503: #endif
1.1 cgd 1504: m_freem(mcopy);
1.63 matt 1505: }
1.1 cgd 1506: return;
1507: }
1508: }
1509: if (mcopy == NULL)
1510: return;
1.13 mycroft 1511: destifp = NULL;
1512:
1.1 cgd 1513: switch (error) {
1514:
1515: case 0: /* forwarded, but need redirect */
1516: /* type, code set above */
1517: break;
1518:
1519: case ENETUNREACH: /* shouldn't happen, checked above */
1520: case EHOSTUNREACH:
1521: case ENETDOWN:
1522: case EHOSTDOWN:
1523: default:
1524: type = ICMP_UNREACH;
1525: code = ICMP_UNREACH_HOST;
1526: break;
1527:
1528: case EMSGSIZE:
1529: type = ICMP_UNREACH;
1530: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1531: #ifndef IPSEC
1.13 mycroft 1532: if (ipforward_rt.ro_rt)
1533: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1534: #else
1535: /*
1536: * If the packet is routed over IPsec tunnel, tell the
1537: * originator the tunnel MTU.
1538: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1539: * XXX quickhack!!!
1540: */
1541: if (ipforward_rt.ro_rt) {
1542: struct secpolicy *sp;
1543: int ipsecerror;
1.95 itojun 1544: size_t ipsechdr;
1.89 itojun 1545: struct route *ro;
1546:
1547: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1548: IPSEC_DIR_OUTBOUND,
1549: IP_FORWARDING,
1550: &ipsecerror);
1.89 itojun 1551:
1552: if (sp == NULL)
1553: destifp = ipforward_rt.ro_rt->rt_ifp;
1554: else {
1555: /* count IPsec header size */
1.95 itojun 1556: ipsechdr = ipsec4_hdrsiz(mcopy,
1557: IPSEC_DIR_OUTBOUND,
1558: NULL);
1.89 itojun 1559:
1560: /*
1561: * find the correct route for outer IPv4
1562: * header, compute tunnel MTU.
1563: *
1564: * XXX BUG ALERT
1565: * The "dummyifp" code relies upon the fact
1566: * that icmp_error() touches only ifp->if_mtu.
1567: */
1568: /*XXX*/
1569: destifp = NULL;
1570: if (sp->req != NULL
1.95 itojun 1571: && sp->req->sav != NULL
1572: && sp->req->sav->sah != NULL) {
1573: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1574: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1575: dummyifp.if_mtu =
1576: ro->ro_rt->rt_ifp->if_mtu;
1577: dummyifp.if_mtu -= ipsechdr;
1578: destifp = &dummyifp;
1579: }
1580: }
1581:
1582: key_freesp(sp);
1583: }
1584: }
1585: #endif /*IPSEC*/
1.1 cgd 1586: ipstat.ips_cantfrag++;
1587: break;
1588:
1589: case ENOBUFS:
1590: type = ICMP_SOURCEQUENCH;
1591: code = 0;
1592: break;
1593: }
1.13 mycroft 1594: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1595: }
1596:
1597: void
1598: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1599: struct inpcb *inp;
1600: struct mbuf **mp;
1601: struct ip *ip;
1602: struct mbuf *m;
1.44 thorpej 1603: {
1604:
1605: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1606: struct timeval tv;
1607:
1608: microtime(&tv);
1609: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1610: SCM_TIMESTAMP, SOL_SOCKET);
1611: if (*mp)
1612: mp = &(*mp)->m_next;
1613: }
1614: if (inp->inp_flags & INP_RECVDSTADDR) {
1615: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1616: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1617: if (*mp)
1618: mp = &(*mp)->m_next;
1619: }
1620: #ifdef notyet
1621: /*
1622: * XXX
1623: * Moving these out of udp_input() made them even more broken
1624: * than they already were.
1625: * - fenner@parc.xerox.com
1626: */
1627: /* options were tossed already */
1628: if (inp->inp_flags & INP_RECVOPTS) {
1629: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1630: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1631: if (*mp)
1632: mp = &(*mp)->m_next;
1633: }
1634: /* ip_srcroute doesn't do what we want here, need to fix */
1635: if (inp->inp_flags & INP_RECVRETOPTS) {
1636: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1637: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1638: if (*mp)
1639: mp = &(*mp)->m_next;
1640: }
1641: #endif
1642: if (inp->inp_flags & INP_RECVIF) {
1643: struct sockaddr_dl sdl;
1644:
1645: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1646: sdl.sdl_family = AF_LINK;
1647: sdl.sdl_index = m->m_pkthdr.rcvif ?
1648: m->m_pkthdr.rcvif->if_index : 0;
1649: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1650: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1651: IP_RECVIF, IPPROTO_IP);
1652: if (*mp)
1653: mp = &(*mp)->m_next;
1654: }
1.13 mycroft 1655: }
1656:
1657: int
1658: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1659: int *name;
1660: u_int namelen;
1661: void *oldp;
1662: size_t *oldlenp;
1663: void *newp;
1664: size_t newlen;
1665: {
1.88 sommerfe 1666: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1667:
1.54 lukem 1668: int error, old;
1669:
1.13 mycroft 1670: /* All sysctl names at this level are terminal. */
1671: if (namelen != 1)
1672: return (ENOTDIR);
1673:
1674: switch (name[0]) {
1675: case IPCTL_FORWARDING:
1676: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1677: case IPCTL_SENDREDIRECTS:
1678: return (sysctl_int(oldp, oldlenp, newp, newlen,
1679: &ipsendredirects));
1680: case IPCTL_DEFTTL:
1681: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1682: #ifdef notyet
1683: case IPCTL_DEFMTU:
1684: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1685: #endif
1.26 thorpej 1686: case IPCTL_FORWSRCRT:
1.47 cjs 1687: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1688: if (securelevel > 0)
1.46 cjs 1689: return (sysctl_rdint(oldp, oldlenp, newp,
1690: ip_forwsrcrt));
1691: else
1692: return (sysctl_int(oldp, oldlenp, newp, newlen,
1693: &ip_forwsrcrt));
1.27 thorpej 1694: case IPCTL_DIRECTEDBCAST:
1695: return (sysctl_int(oldp, oldlenp, newp, newlen,
1696: &ip_directedbcast));
1.47 cjs 1697: case IPCTL_ALLOWSRCRT:
1698: return (sysctl_int(oldp, oldlenp, newp, newlen,
1699: &ip_allowsrcrt));
1.52 thorpej 1700: case IPCTL_SUBNETSARELOCAL:
1701: return (sysctl_int(oldp, oldlenp, newp, newlen,
1702: &subnetsarelocal));
1.53 kml 1703: case IPCTL_MTUDISC:
1.60 kml 1704: error = sysctl_int(oldp, oldlenp, newp, newlen,
1705: &ip_mtudisc);
1706: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1707: ip_mtudisc_timeout_q =
1708: rt_timer_queue_create(ip_mtudisc_timeout);
1709: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1710: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1711: ip_mtudisc_timeout_q = NULL;
1712: }
1713: return error;
1.54 lukem 1714: case IPCTL_ANONPORTMIN:
1715: old = anonportmin;
1716: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1717: if (anonportmin >= anonportmax || anonportmin < 0
1718: || anonportmin > 65535
1.54 lukem 1719: #ifndef IPNOPRIVPORTS
1720: || anonportmin < IPPORT_RESERVED
1721: #endif
1722: ) {
1723: anonportmin = old;
1724: return (EINVAL);
1725: }
1726: return (error);
1727: case IPCTL_ANONPORTMAX:
1728: old = anonportmax;
1729: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1730: if (anonportmin >= anonportmax || anonportmax < 0
1731: || anonportmax > 65535
1.54 lukem 1732: #ifndef IPNOPRIVPORTS
1733: || anonportmax < IPPORT_RESERVED
1734: #endif
1735: ) {
1736: anonportmax = old;
1737: return (EINVAL);
1738: }
1.60 kml 1739: return (error);
1740: case IPCTL_MTUDISCTIMEOUT:
1741: error = sysctl_int(oldp, oldlenp, newp, newlen,
1742: &ip_mtudisc_timeout);
1743: if (ip_mtudisc_timeout_q != NULL)
1744: rt_timer_queue_change(ip_mtudisc_timeout_q,
1745: ip_mtudisc_timeout);
1.54 lukem 1746: return (error);
1.65 matt 1747: #ifdef GATEWAY
1748: case IPCTL_MAXFLOWS:
1.67 thorpej 1749: {
1750: int s;
1751:
1.65 matt 1752: error = sysctl_int(oldp, oldlenp, newp, newlen,
1753: &ip_maxflows);
1.67 thorpej 1754: s = splsoftnet();
1.65 matt 1755: ipflow_reap(0);
1.67 thorpej 1756: splx(s);
1.65 matt 1757: return (error);
1.67 thorpej 1758: }
1.89 itojun 1759: #endif
1.90 itojun 1760: case IPCTL_HOSTZEROBROADCAST:
1761: return (sysctl_int(oldp, oldlenp, newp, newlen,
1762: &hostzeroisbroadcast));
1.89 itojun 1763: #if NGIF > 0
1764: case IPCTL_GIF_TTL:
1765: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1766: &ip_gif_ttl));
1.117 tron 1767: #endif
1768:
1769: #ifndef IPNOPRIVPORTS
1770: case IPCTL_LOWPORTMIN:
1771: old = lowportmin;
1772: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1773: if (lowportmin >= lowportmax
1774: || lowportmin > IPPORT_RESERVEDMAX
1775: || lowportmin < IPPORT_RESERVEDMIN
1776: ) {
1777: lowportmin = old;
1778: return (EINVAL);
1779: }
1780: return (error);
1781: case IPCTL_LOWPORTMAX:
1782: old = lowportmax;
1783: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1784: if (lowportmin >= lowportmax
1785: || lowportmax > IPPORT_RESERVEDMAX
1786: || lowportmax < IPPORT_RESERVEDMIN
1787: ) {
1788: lowportmax = old;
1789: return (EINVAL);
1790: }
1791: return (error);
1.65 matt 1792: #endif
1.88 sommerfe 1793:
1.13 mycroft 1794: default:
1795: return (EOPNOTSUPP);
1796: }
1797: /* NOTREACHED */
1.1 cgd 1798: }
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