Annotation of src/sys/netinet/ip_input.c, Revision 1.132
1.132 ! thorpej 1: /* $NetBSD: ip_input.c,v 1.131 2001/03/27 02:24:38 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;
1.131 itojun 214: int ip_nfragpackets = 0;
215: int ip_maxfragpackets = -1;
1.75 thorpej 216:
217: static __inline int ipq_lock_try __P((void));
218: static __inline void ipq_unlock __P((void));
219:
220: static __inline int
221: ipq_lock_try()
222: {
223: int s;
224:
1.132 ! thorpej 225: /*
! 226: * Use splvm() -- we're bloking things that would cause
! 227: * mbuf allocation.
! 228: */
! 229: s = splvm();
1.75 thorpej 230: if (ipq_locked) {
231: splx(s);
232: return (0);
233: }
234: ipq_locked = 1;
235: splx(s);
236: return (1);
237: }
238:
239: static __inline void
240: ipq_unlock()
241: {
242: int s;
243:
1.132 ! thorpej 244: s = splvm();
1.75 thorpej 245: ipq_locked = 0;
246: splx(s);
247: }
248:
249: #ifdef DIAGNOSTIC
250: #define IPQ_LOCK() \
251: do { \
252: if (ipq_lock_try() == 0) { \
253: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
254: panic("ipq_lock"); \
255: } \
256: } while (0)
257: #define IPQ_LOCK_CHECK() \
258: do { \
259: if (ipq_locked == 0) { \
260: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
261: panic("ipq lock check"); \
262: } \
263: } while (0)
264: #else
265: #define IPQ_LOCK() (void) ipq_lock_try()
266: #define IPQ_LOCK_CHECK() /* nothing */
267: #endif
268:
269: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 270:
1.72 thorpej 271: struct pool ipqent_pool;
272:
1.1 cgd 273: /*
274: * We need to save the IP options in case a protocol wants to respond
275: * to an incoming packet over the same route if the packet got here
276: * using IP source routing. This allows connection establishment and
277: * maintenance when the remote end is on a network that is not known
278: * to us.
279: */
280: int ip_nhops = 0;
281: static struct ip_srcrt {
282: struct in_addr dst; /* final destination */
283: char nop; /* one NOP to align */
284: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
285: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
286: } ip_srcrt;
287:
1.13 mycroft 288: static void save_rte __P((u_char *, struct in_addr));
1.35 mycroft 289:
1.1 cgd 290: /*
291: * IP initialization: fill in IP protocol switch table.
292: * All protocols not implemented in kernel go to raw IP protocol handler.
293: */
1.8 mycroft 294: void
1.1 cgd 295: ip_init()
296: {
1.109 augustss 297: struct protosw *pr;
298: int i;
1.1 cgd 299:
1.72 thorpej 300: pool_init(&ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl",
301: 0, NULL, NULL, M_IPQ);
302:
1.1 cgd 303: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
304: if (pr == 0)
305: panic("ip_init");
306: for (i = 0; i < IPPROTO_MAX; i++)
307: ip_protox[i] = pr - inetsw;
308: for (pr = inetdomain.dom_protosw;
309: pr < inetdomain.dom_protoswNPROTOSW; pr++)
310: if (pr->pr_domain->dom_family == PF_INET &&
311: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
312: ip_protox[pr->pr_protocol] = pr - inetsw;
1.25 cgd 313: LIST_INIT(&ipq);
1.1 cgd 314: ip_id = time.tv_sec & 0xffff;
315: ipintrq.ifq_maxlen = ipqmaxlen;
1.22 mycroft 316: TAILQ_INIT(&in_ifaddr);
1.120 ad 317: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
318: M_WAITOK, &in_ifaddrhash);
1.60 kml 319: if (ip_mtudisc != 0)
320: ip_mtudisc_timeout_q =
321: rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 322: #ifdef GATEWAY
323: ipflow_init();
324: #endif
1.121 thorpej 325:
326: #ifdef PFIL_HOOKS
327: /* Register our Packet Filter hook. */
1.126 thorpej 328: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
329: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 330: i = pfil_head_register(&inet_pfil_hook);
331: if (i != 0)
332: printf("ip_init: WARNING: unable to register pfil hook, "
333: "error %d\n", i);
334: #endif /* PFIL_HOOKS */
1.1 cgd 335: }
336:
337: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
338: struct route ipforward_rt;
339:
340: /*
1.89 itojun 341: * IP software interrupt routine
342: */
343: void
344: ipintr()
345: {
346: int s;
347: struct mbuf *m;
348:
349: while (1) {
1.132 ! thorpej 350: s = splnet();
1.89 itojun 351: IF_DEQUEUE(&ipintrq, m);
352: splx(s);
353: if (m == 0)
354: return;
355: ip_input(m);
356: }
357: }
358:
359: /*
1.1 cgd 360: * Ip input routine. Checksum and byte swap header. If fragmented
361: * try to reassemble. Process options. Pass to next level.
362: */
1.8 mycroft 363: void
1.89 itojun 364: ip_input(struct mbuf *m)
1.1 cgd 365: {
1.109 augustss 366: struct ip *ip = NULL;
367: struct ipq *fp;
368: struct in_ifaddr *ia;
369: struct ifaddr *ifa;
1.25 cgd 370: struct ipqent *ipqe;
1.89 itojun 371: int hlen = 0, mff, len;
1.100 itojun 372: int downmatch;
1.1 cgd 373:
374: #ifdef DIAGNOSTIC
375: if ((m->m_flags & M_PKTHDR) == 0)
376: panic("ipintr no HDR");
377: #endif
1.89 itojun 378: #ifdef IPSEC
379: /*
380: * should the inner packet be considered authentic?
381: * see comment in ah4_input().
382: */
383: if (m) {
384: m->m_flags &= ~M_AUTHIPHDR;
385: m->m_flags &= ~M_AUTHIPDGM;
386: }
387: #endif
1.1 cgd 388: /*
389: * If no IP addresses have been set yet but the interfaces
390: * are receiving, can't do anything with incoming packets yet.
391: */
1.22 mycroft 392: if (in_ifaddr.tqh_first == 0)
1.1 cgd 393: goto bad;
394: ipstat.ips_total++;
395: if (m->m_len < sizeof (struct ip) &&
396: (m = m_pullup(m, sizeof (struct ip))) == 0) {
397: ipstat.ips_toosmall++;
1.89 itojun 398: return;
1.1 cgd 399: }
400: ip = mtod(m, struct ip *);
1.13 mycroft 401: if (ip->ip_v != IPVERSION) {
402: ipstat.ips_badvers++;
403: goto bad;
404: }
1.1 cgd 405: hlen = ip->ip_hl << 2;
406: if (hlen < sizeof(struct ip)) { /* minimum header length */
407: ipstat.ips_badhlen++;
408: goto bad;
409: }
410: if (hlen > m->m_len) {
411: if ((m = m_pullup(m, hlen)) == 0) {
412: ipstat.ips_badhlen++;
1.89 itojun 413: return;
1.1 cgd 414: }
415: ip = mtod(m, struct ip *);
416: }
1.98 thorpej 417:
1.85 hwr 418: /*
1.99 thorpej 419: * RFC1122: packets with a multicast source address are
1.98 thorpej 420: * not allowed.
1.85 hwr 421: */
422: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 423: ipstat.ips_badaddr++;
1.85 hwr 424: goto bad;
1.129 itojun 425: }
426:
427: /* 127/8 must not appear on wire - RFC1122 */
428: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
429: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 430: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
431: ipstat.ips_badaddr++;
1.129 itojun 432: goto bad;
1.130 itojun 433: }
1.85 hwr 434: }
435:
1.78 mycroft 436: if (in_cksum(m, hlen) != 0) {
1.1 cgd 437: ipstat.ips_badsum++;
438: goto bad;
439: }
440:
1.121 thorpej 441: /* Retrieve the packet length. */
442: len = ntohs(ip->ip_len);
1.81 proff 443:
444: /*
445: * Check for additional length bogosity
446: */
1.84 proff 447: if (len < hlen) {
1.81 proff 448: ipstat.ips_badlen++;
449: goto bad;
450: }
1.1 cgd 451:
452: /*
453: * Check that the amount of data in the buffers
454: * is as at least much as the IP header would have us expect.
455: * Trim mbufs if longer than we expect.
456: * Drop packet if shorter than we expect.
457: */
1.35 mycroft 458: if (m->m_pkthdr.len < len) {
1.1 cgd 459: ipstat.ips_tooshort++;
460: goto bad;
461: }
1.35 mycroft 462: if (m->m_pkthdr.len > len) {
1.1 cgd 463: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 464: m->m_len = len;
465: m->m_pkthdr.len = len;
1.1 cgd 466: } else
1.35 mycroft 467: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 468: }
469:
1.94 itojun 470: #ifdef IPSEC
471: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
472: m->m_flags &= ~M_CANFASTFWD;
473: #else
1.64 thorpej 474: /*
475: * Assume that we can create a fast-forward IP flow entry
476: * based on this packet.
477: */
478: m->m_flags |= M_CANFASTFWD;
1.94 itojun 479: #endif
1.64 thorpej 480:
1.36 mrg 481: #ifdef PFIL_HOOKS
1.33 mrg 482: /*
1.64 thorpej 483: * Run through list of hooks for input packets. If there are any
484: * filters which require that additional packets in the flow are
485: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
486: * Note that filters must _never_ set this flag, as another filter
487: * in the list may have previously cleared it.
1.33 mrg 488: */
1.127 itojun 489: /*
490: * let ipfilter look at packet on the wire,
491: * not the decapsulated packet.
492: */
493: #ifdef IPSEC
494: if (!ipsec_gethist(m, NULL))
495: #else
496: if (1)
497: #endif
498: {
499: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
500: PFIL_IN) != 0)
1.121 thorpej 501: return;
1.127 itojun 502: if (m == NULL)
503: return;
504: ip = mtod(m, struct ip *);
505: }
1.36 mrg 506: #endif /* PFIL_HOOKS */
1.123 thorpej 507:
508: #ifdef ALTQ
509: /* XXX Temporary until ALTQ is changed to use a pfil hook */
510: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
511: /* packet dropped by traffic conditioner */
512: return;
513: }
514: #endif
1.121 thorpej 515:
516: /*
517: * Convert fields to host representation.
518: */
519: NTOHS(ip->ip_len);
520: NTOHS(ip->ip_off);
1.33 mrg 521:
1.1 cgd 522: /*
523: * Process options and, if not destined for us,
524: * ship it on. ip_dooptions returns 1 when an
525: * error was detected (causing an icmp message
526: * to be sent and the original packet to be freed).
527: */
528: ip_nhops = 0; /* for source routed packets */
529: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 530: return;
1.1 cgd 531:
532: /*
533: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 534: *
535: * Traditional 4.4BSD did not consult IFF_UP at all.
536: * The behavior here is to treat addresses on !IFF_UP interface
537: * as not mine.
1.1 cgd 538: */
1.100 itojun 539: downmatch = 0;
1.97 itojun 540: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
541: ia != NULL;
542: ia = ia->ia_hash.le_next) {
543: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
544: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
545: break;
1.100 itojun 546: else
547: downmatch++;
1.97 itojun 548: }
549: }
1.86 thorpej 550: if (ia != NULL)
551: goto ours;
1.57 tls 552: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
553: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
554: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
555: if (ifa->ifa_addr->sa_family != AF_INET) continue;
556: ia = ifatoia(ifa);
1.35 mycroft 557: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
558: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 559: /*
560: * Look for all-0's host part (old broadcast addr),
561: * either for subnet or net.
562: */
563: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 564: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 565: goto ours;
1.57 tls 566: /*
567: * An interface with IP address zero accepts
568: * all packets that arrive on that interface.
569: */
570: if (in_nullhost(ia->ia_addr.sin_addr))
571: goto ours;
1.1 cgd 572: }
573: }
1.18 mycroft 574: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 575: struct in_multi *inm;
576: #ifdef MROUTING
577: extern struct socket *ip_mrouter;
1.10 brezak 578:
579: if (m->m_flags & M_EXT) {
580: if ((m = m_pullup(m, hlen)) == 0) {
581: ipstat.ips_toosmall++;
1.89 itojun 582: return;
1.10 brezak 583: }
584: ip = mtod(m, struct ip *);
585: }
1.4 hpeyerl 586:
587: if (ip_mrouter) {
588: /*
589: * If we are acting as a multicast router, all
590: * incoming multicast packets are passed to the
591: * kernel-level multicast forwarding function.
592: * The packet is returned (relatively) intact; if
593: * ip_mforward() returns a non-zero value, the packet
594: * must be discarded, else it may be accepted below.
595: *
596: * (The IP ident field is put in the same byte order
597: * as expected when ip_mforward() is called from
598: * ip_output().)
599: */
1.13 mycroft 600: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
601: ipstat.ips_cantforward++;
1.4 hpeyerl 602: m_freem(m);
1.89 itojun 603: return;
1.4 hpeyerl 604: }
605:
606: /*
607: * The process-level routing demon needs to receive
608: * all multicast IGMP packets, whether or not this
609: * host belongs to their destination groups.
610: */
611: if (ip->ip_p == IPPROTO_IGMP)
612: goto ours;
1.13 mycroft 613: ipstat.ips_forward++;
1.4 hpeyerl 614: }
615: #endif
616: /*
617: * See if we belong to the destination multicast group on the
618: * arrival interface.
619: */
620: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
621: if (inm == NULL) {
1.13 mycroft 622: ipstat.ips_cantforward++;
1.4 hpeyerl 623: m_freem(m);
1.89 itojun 624: return;
1.4 hpeyerl 625: }
626: goto ours;
627: }
1.19 mycroft 628: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 629: in_nullhost(ip->ip_dst))
1.1 cgd 630: goto ours;
631:
632: /*
633: * Not for us; forward if possible and desirable.
634: */
635: if (ipforwarding == 0) {
636: ipstat.ips_cantforward++;
637: m_freem(m);
1.100 itojun 638: } else {
639: /*
640: * If ip_dst matched any of my address on !IFF_UP interface,
641: * and there's no IFF_UP interface that matches ip_dst,
642: * send icmp unreach. Forwarding it will result in in-kernel
643: * forwarding loop till TTL goes to 0.
644: */
645: if (downmatch) {
646: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
647: ipstat.ips_cantforward++;
648: return;
649: }
1.1 cgd 650: ip_forward(m, 0);
1.100 itojun 651: }
1.89 itojun 652: return;
1.1 cgd 653:
654: ours:
655: /*
656: * If offset or IP_MF are set, must reassemble.
657: * Otherwise, nothing need be done.
658: * (We could look in the reassembly queue to see
659: * if the packet was previously fragmented,
660: * but it's not worth the time; just let them time out.)
661: */
1.37 perry 662: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 663: /*
664: * Look for queue of fragments
665: * of this datagram.
666: */
1.75 thorpej 667: IPQ_LOCK();
1.25 cgd 668: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 669: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 670: in_hosteq(ip->ip_src, fp->ipq_src) &&
671: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 672: ip->ip_p == fp->ipq_p)
673: goto found;
674: fp = 0;
675: found:
676:
677: /*
678: * Adjust ip_len to not reflect header,
1.25 cgd 679: * set ipqe_mff if more fragments are expected,
1.1 cgd 680: * convert offset of this to bytes.
681: */
682: ip->ip_len -= hlen;
1.25 cgd 683: mff = (ip->ip_off & IP_MF) != 0;
684: if (mff) {
1.16 cgd 685: /*
686: * Make sure that fragments have a data length
687: * that's a non-zero multiple of 8 bytes.
688: */
1.17 cgd 689: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 690: ipstat.ips_badfrags++;
1.75 thorpej 691: IPQ_UNLOCK();
1.16 cgd 692: goto bad;
693: }
694: }
1.1 cgd 695: ip->ip_off <<= 3;
696:
697: /*
698: * If datagram marked as having more fragments
699: * or if this is not the first fragment,
700: * attempt reassembly; if it succeeds, proceed.
701: */
1.25 cgd 702: if (mff || ip->ip_off) {
1.1 cgd 703: ipstat.ips_fragments++;
1.72 thorpej 704: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 705: if (ipqe == NULL) {
706: ipstat.ips_rcvmemdrop++;
1.75 thorpej 707: IPQ_UNLOCK();
1.25 cgd 708: goto bad;
709: }
710: ipqe->ipqe_mff = mff;
1.50 thorpej 711: ipqe->ipqe_m = m;
1.25 cgd 712: ipqe->ipqe_ip = ip;
1.50 thorpej 713: m = ip_reass(ipqe, fp);
1.75 thorpej 714: if (m == 0) {
715: IPQ_UNLOCK();
1.89 itojun 716: return;
1.75 thorpej 717: }
1.13 mycroft 718: ipstat.ips_reassembled++;
1.50 thorpej 719: ip = mtod(m, struct ip *);
1.74 thorpej 720: hlen = ip->ip_hl << 2;
1.79 mycroft 721: ip->ip_len += hlen;
1.1 cgd 722: } else
723: if (fp)
724: ip_freef(fp);
1.75 thorpej 725: IPQ_UNLOCK();
1.79 mycroft 726: }
1.128 itojun 727:
728: #ifdef IPSEC
729: /*
730: * enforce IPsec policy checking if we are seeing last header.
731: * note that we do not visit this with protocols with pcb layer
732: * code - like udp/tcp/raw ip.
733: */
734: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
735: ipsec4_in_reject(m, NULL)) {
736: ipsecstat.in_polvio++;
737: goto bad;
738: }
739: #endif
1.1 cgd 740:
741: /*
742: * Switch out to protocol's input routine.
743: */
1.82 aidan 744: #if IFA_STATS
1.122 itojun 745: if (ia && ip)
746: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 747: #endif
1.1 cgd 748: ipstat.ips_delivered++;
1.89 itojun 749: {
750: int off = hlen, nh = ip->ip_p;
751:
752: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
753: return;
754: }
1.1 cgd 755: bad:
756: m_freem(m);
757: }
758:
759: /*
760: * Take incoming datagram fragment and try to
761: * reassemble it into whole datagram. If a chain for
762: * reassembly of this datagram already exists, then it
763: * is given as fp; otherwise have to make a chain.
764: */
1.50 thorpej 765: struct mbuf *
1.25 cgd 766: ip_reass(ipqe, fp)
1.109 augustss 767: struct ipqent *ipqe;
768: struct ipq *fp;
1.1 cgd 769: {
1.109 augustss 770: struct mbuf *m = ipqe->ipqe_m;
771: struct ipqent *nq, *p, *q;
1.25 cgd 772: struct ip *ip;
1.1 cgd 773: struct mbuf *t;
1.25 cgd 774: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 775: int i, next;
776:
1.75 thorpej 777: IPQ_LOCK_CHECK();
778:
1.1 cgd 779: /*
780: * Presence of header sizes in mbufs
781: * would confuse code below.
782: */
783: m->m_data += hlen;
784: m->m_len -= hlen;
785:
786: /*
787: * If first fragment to arrive, create a reassembly queue.
788: */
789: if (fp == 0) {
1.131 itojun 790: /*
791: * Enforce upper bound on number of fragmented packets
792: * for which we attempt reassembly;
793: * If maxfrag is 0, never accept fragments.
794: * If maxfrag is -1, accept all fragments without limitation.
795: */
796: if (ip_maxfragpackets < 0)
797: ;
798: else if (ip_nfragpackets >= ip_maxfragpackets)
799: goto dropfrag;
800: ip_nfragpackets++;
1.50 thorpej 801: MALLOC(fp, struct ipq *, sizeof (struct ipq),
802: M_FTABLE, M_NOWAIT);
803: if (fp == NULL)
1.1 cgd 804: goto dropfrag;
1.25 cgd 805: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 806: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 807: fp->ipq_p = ipqe->ipqe_ip->ip_p;
808: fp->ipq_id = ipqe->ipqe_ip->ip_id;
809: LIST_INIT(&fp->ipq_fragq);
810: fp->ipq_src = ipqe->ipqe_ip->ip_src;
811: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
812: p = NULL;
1.1 cgd 813: goto insert;
814: }
815:
816: /*
817: * Find a segment which begins after this one does.
818: */
1.25 cgd 819: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
820: p = q, q = q->ipqe_q.le_next)
821: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 822: break;
823:
824: /*
825: * If there is a preceding segment, it may provide some of
826: * our data already. If so, drop the data from the incoming
827: * segment. If it provides all of our data, drop us.
828: */
1.25 cgd 829: if (p != NULL) {
830: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
831: ipqe->ipqe_ip->ip_off;
1.1 cgd 832: if (i > 0) {
1.25 cgd 833: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 834: goto dropfrag;
1.50 thorpej 835: m_adj(ipqe->ipqe_m, i);
1.25 cgd 836: ipqe->ipqe_ip->ip_off += i;
837: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 838: }
839: }
840:
841: /*
842: * While we overlap succeeding segments trim them or,
843: * if they are completely covered, dequeue them.
844: */
1.25 cgd 845: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
846: q->ipqe_ip->ip_off; q = nq) {
847: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
848: q->ipqe_ip->ip_off;
849: if (i < q->ipqe_ip->ip_len) {
850: q->ipqe_ip->ip_len -= i;
851: q->ipqe_ip->ip_off += i;
1.50 thorpej 852: m_adj(q->ipqe_m, i);
1.1 cgd 853: break;
854: }
1.25 cgd 855: nq = q->ipqe_q.le_next;
1.50 thorpej 856: m_freem(q->ipqe_m);
1.25 cgd 857: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 858: pool_put(&ipqent_pool, q);
1.1 cgd 859: }
860:
861: insert:
862: /*
863: * Stick new segment in its place;
864: * check for complete reassembly.
865: */
1.25 cgd 866: if (p == NULL) {
867: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
868: } else {
869: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
870: }
1.1 cgd 871: next = 0;
1.25 cgd 872: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
873: p = q, q = q->ipqe_q.le_next) {
874: if (q->ipqe_ip->ip_off != next)
1.1 cgd 875: return (0);
1.25 cgd 876: next += q->ipqe_ip->ip_len;
1.1 cgd 877: }
1.25 cgd 878: if (p->ipqe_mff)
1.1 cgd 879: return (0);
880:
881: /*
1.41 thorpej 882: * Reassembly is complete. Check for a bogus message size and
883: * concatenate fragments.
1.1 cgd 884: */
1.25 cgd 885: q = fp->ipq_fragq.lh_first;
886: ip = q->ipqe_ip;
1.41 thorpej 887: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
888: ipstat.ips_toolong++;
889: ip_freef(fp);
890: return (0);
891: }
1.50 thorpej 892: m = q->ipqe_m;
1.1 cgd 893: t = m->m_next;
894: m->m_next = 0;
895: m_cat(m, t);
1.25 cgd 896: nq = q->ipqe_q.le_next;
1.72 thorpej 897: pool_put(&ipqent_pool, q);
1.25 cgd 898: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 899: t = q->ipqe_m;
1.25 cgd 900: nq = q->ipqe_q.le_next;
1.72 thorpej 901: pool_put(&ipqent_pool, q);
1.1 cgd 902: m_cat(m, t);
903: }
904:
905: /*
906: * Create header for new ip packet by
907: * modifying header of first packet;
908: * dequeue and discard fragment reassembly header.
909: * Make header visible.
910: */
911: ip->ip_len = next;
1.25 cgd 912: ip->ip_src = fp->ipq_src;
913: ip->ip_dst = fp->ipq_dst;
914: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 915: FREE(fp, M_FTABLE);
1.131 itojun 916: ip_nfragpackets--;
1.1 cgd 917: m->m_len += (ip->ip_hl << 2);
918: m->m_data -= (ip->ip_hl << 2);
919: /* some debugging cruft by sklower, below, will go away soon */
920: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 921: int plen = 0;
1.50 thorpej 922: for (t = m; t; t = t->m_next)
923: plen += t->m_len;
924: m->m_pkthdr.len = plen;
1.1 cgd 925: }
1.50 thorpej 926: return (m);
1.1 cgd 927:
928: dropfrag:
929: ipstat.ips_fragdropped++;
930: m_freem(m);
1.72 thorpej 931: pool_put(&ipqent_pool, ipqe);
1.1 cgd 932: return (0);
933: }
934:
935: /*
936: * Free a fragment reassembly header and all
937: * associated datagrams.
938: */
1.8 mycroft 939: void
1.1 cgd 940: ip_freef(fp)
941: struct ipq *fp;
942: {
1.109 augustss 943: struct ipqent *q, *p;
1.1 cgd 944:
1.75 thorpej 945: IPQ_LOCK_CHECK();
946:
1.25 cgd 947: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
948: p = q->ipqe_q.le_next;
1.50 thorpej 949: m_freem(q->ipqe_m);
1.25 cgd 950: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 951: pool_put(&ipqent_pool, q);
1.1 cgd 952: }
1.25 cgd 953: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 954: FREE(fp, M_FTABLE);
1.131 itojun 955: ip_nfragpackets--;
1.1 cgd 956: }
957:
958: /*
959: * IP timer processing;
960: * if a timer expires on a reassembly
961: * queue, discard it.
962: */
1.8 mycroft 963: void
1.1 cgd 964: ip_slowtimo()
965: {
1.109 augustss 966: struct ipq *fp, *nfp;
1.24 mycroft 967: int s = splsoftnet();
1.1 cgd 968:
1.75 thorpej 969: IPQ_LOCK();
1.25 cgd 970: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
971: nfp = fp->ipq_q.le_next;
972: if (--fp->ipq_ttl == 0) {
1.1 cgd 973: ipstat.ips_fragtimeout++;
1.25 cgd 974: ip_freef(fp);
1.1 cgd 975: }
976: }
1.131 itojun 977: /*
978: * If we are over the maximum number of fragments
979: * (due to the limit being lowered), drain off
980: * enough to get down to the new limit.
981: */
982: if (ip_maxfragpackets < 0)
983: ;
984: else {
985: while (ip_nfragpackets > ip_maxfragpackets && ipq.lh_first)
986: ip_freef(ipq.lh_first);
987: }
1.75 thorpej 988: IPQ_UNLOCK();
1.63 matt 989: #ifdef GATEWAY
990: ipflow_slowtimo();
991: #endif
1.1 cgd 992: splx(s);
993: }
994:
995: /*
996: * Drain off all datagram fragments.
997: */
1.8 mycroft 998: void
1.1 cgd 999: ip_drain()
1000: {
1001:
1.75 thorpej 1002: /*
1003: * We may be called from a device's interrupt context. If
1004: * the ipq is already busy, just bail out now.
1005: */
1006: if (ipq_lock_try() == 0)
1007: return;
1008:
1.25 cgd 1009: while (ipq.lh_first != NULL) {
1.1 cgd 1010: ipstat.ips_fragdropped++;
1.25 cgd 1011: ip_freef(ipq.lh_first);
1.1 cgd 1012: }
1.75 thorpej 1013:
1014: IPQ_UNLOCK();
1.1 cgd 1015: }
1016:
1017: /*
1018: * Do option processing on a datagram,
1019: * possibly discarding it if bad options are encountered,
1020: * or forwarding it if source-routed.
1021: * Returns 1 if packet has been forwarded/freed,
1022: * 0 if the packet should be processed further.
1023: */
1.8 mycroft 1024: int
1.1 cgd 1025: ip_dooptions(m)
1026: struct mbuf *m;
1027: {
1.109 augustss 1028: struct ip *ip = mtod(m, struct ip *);
1029: u_char *cp, *cp0;
1030: struct ip_timestamp *ipt;
1031: struct in_ifaddr *ia;
1.1 cgd 1032: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1033: struct in_addr dst;
1.1 cgd 1034: n_time ntime;
1035:
1.13 mycroft 1036: dst = ip->ip_dst;
1.1 cgd 1037: cp = (u_char *)(ip + 1);
1038: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1039: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1040: opt = cp[IPOPT_OPTVAL];
1041: if (opt == IPOPT_EOL)
1042: break;
1043: if (opt == IPOPT_NOP)
1044: optlen = 1;
1045: else {
1.113 itojun 1046: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1047: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1048: goto bad;
1049: }
1.1 cgd 1050: optlen = cp[IPOPT_OLEN];
1.114 itojun 1051: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1052: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1053: goto bad;
1054: }
1055: }
1056: switch (opt) {
1057:
1058: default:
1059: break;
1060:
1061: /*
1062: * Source routing with record.
1063: * Find interface with current destination address.
1064: * If none on this machine then drop if strictly routed,
1065: * or do nothing if loosely routed.
1066: * Record interface address and bring up next address
1067: * component. If strictly routed make sure next
1068: * address is on directly accessible net.
1069: */
1070: case IPOPT_LSRR:
1071: case IPOPT_SSRR:
1.47 cjs 1072: if (ip_allowsrcrt == 0) {
1073: type = ICMP_UNREACH;
1074: code = ICMP_UNREACH_NET_PROHIB;
1075: goto bad;
1076: }
1.114 itojun 1077: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1078: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1079: goto bad;
1080: }
1.1 cgd 1081: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1082: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1083: goto bad;
1084: }
1085: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1086: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1087: if (ia == 0) {
1088: if (opt == IPOPT_SSRR) {
1089: type = ICMP_UNREACH;
1090: code = ICMP_UNREACH_SRCFAIL;
1091: goto bad;
1092: }
1093: /*
1094: * Loose routing, and not at next destination
1095: * yet; nothing to do except forward.
1096: */
1097: break;
1098: }
1099: off--; /* 0 origin */
1.112 sommerfe 1100: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1101: /*
1102: * End of source route. Should be for us.
1103: */
1104: save_rte(cp, ip->ip_src);
1105: break;
1106: }
1107: /*
1108: * locate outgoing interface
1109: */
1110: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1111: sizeof(ipaddr.sin_addr));
1.96 thorpej 1112: if (opt == IPOPT_SSRR)
1113: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1114: else
1.1 cgd 1115: ia = ip_rtaddr(ipaddr.sin_addr);
1116: if (ia == 0) {
1117: type = ICMP_UNREACH;
1118: code = ICMP_UNREACH_SRCFAIL;
1119: goto bad;
1120: }
1121: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1122: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1123: (caddr_t)(cp + off), sizeof(struct in_addr));
1124: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1125: /*
1126: * Let ip_intr's mcast routing check handle mcast pkts
1127: */
1.18 mycroft 1128: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1129: break;
1130:
1131: case IPOPT_RR:
1.114 itojun 1132: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1133: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1134: goto bad;
1135: }
1.1 cgd 1136: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1137: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1138: goto bad;
1139: }
1140: /*
1141: * If no space remains, ignore.
1142: */
1143: off--; /* 0 origin */
1.112 sommerfe 1144: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1145: break;
1146: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1147: sizeof(ipaddr.sin_addr));
1148: /*
1149: * locate outgoing interface; if we're the destination,
1150: * use the incoming interface (should be same).
1151: */
1.96 thorpej 1152: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1153: == NULL &&
1154: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1155: type = ICMP_UNREACH;
1156: code = ICMP_UNREACH_HOST;
1157: goto bad;
1158: }
1.20 mycroft 1159: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1160: (caddr_t)(cp + off), sizeof(struct in_addr));
1161: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1162: break;
1163:
1164: case IPOPT_TS:
1165: code = cp - (u_char *)ip;
1166: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1167: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1168: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1169: goto bad;
1.114 itojun 1170: }
1171: if (ipt->ipt_ptr < 5) {
1172: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1173: goto bad;
1174: }
1.15 cgd 1175: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1176: if (++ipt->ipt_oflw == 0) {
1177: code = (u_char *)&ipt->ipt_ptr -
1178: (u_char *)ip;
1.1 cgd 1179: goto bad;
1.114 itojun 1180: }
1.1 cgd 1181: break;
1182: }
1.104 thorpej 1183: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1184: switch (ipt->ipt_flg) {
1185:
1186: case IPOPT_TS_TSONLY:
1187: break;
1188:
1189: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1190: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1191: sizeof(struct in_addr) > ipt->ipt_len) {
1192: code = (u_char *)&ipt->ipt_ptr -
1193: (u_char *)ip;
1.1 cgd 1194: goto bad;
1.114 itojun 1195: }
1.13 mycroft 1196: ipaddr.sin_addr = dst;
1.96 thorpej 1197: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1198: m->m_pkthdr.rcvif));
1.13 mycroft 1199: if (ia == 0)
1200: continue;
1.104 thorpej 1201: bcopy(&ia->ia_addr.sin_addr,
1202: cp0, sizeof(struct in_addr));
1.1 cgd 1203: ipt->ipt_ptr += sizeof(struct in_addr);
1204: break;
1205:
1206: case IPOPT_TS_PRESPEC:
1.66 thorpej 1207: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1208: sizeof(struct in_addr) > ipt->ipt_len) {
1209: code = (u_char *)&ipt->ipt_ptr -
1210: (u_char *)ip;
1.1 cgd 1211: goto bad;
1.114 itojun 1212: }
1.104 thorpej 1213: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1214: sizeof(struct in_addr));
1.96 thorpej 1215: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1216: == NULL)
1.1 cgd 1217: continue;
1218: ipt->ipt_ptr += sizeof(struct in_addr);
1219: break;
1220:
1221: default:
1.114 itojun 1222: /* XXX can't take &ipt->ipt_flg */
1223: code = (u_char *)&ipt->ipt_ptr -
1224: (u_char *)ip + 1;
1.1 cgd 1225: goto bad;
1226: }
1227: ntime = iptime();
1.107 thorpej 1228: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1229: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1230: sizeof(n_time));
1231: ipt->ipt_ptr += sizeof(n_time);
1232: }
1233: }
1234: if (forward) {
1.26 thorpej 1235: if (ip_forwsrcrt == 0) {
1236: type = ICMP_UNREACH;
1237: code = ICMP_UNREACH_SRCFAIL;
1238: goto bad;
1239: }
1.1 cgd 1240: ip_forward(m, 1);
1241: return (1);
1.13 mycroft 1242: }
1243: return (0);
1.1 cgd 1244: bad:
1.13 mycroft 1245: icmp_error(m, type, code, 0, 0);
1246: ipstat.ips_badoptions++;
1.1 cgd 1247: return (1);
1248: }
1249:
1250: /*
1251: * Given address of next destination (final or next hop),
1252: * return internet address info of interface to be used to get there.
1253: */
1254: struct in_ifaddr *
1255: ip_rtaddr(dst)
1256: struct in_addr dst;
1257: {
1.109 augustss 1258: struct sockaddr_in *sin;
1.1 cgd 1259:
1.19 mycroft 1260: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1261:
1.35 mycroft 1262: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1263: if (ipforward_rt.ro_rt) {
1264: RTFREE(ipforward_rt.ro_rt);
1265: ipforward_rt.ro_rt = 0;
1266: }
1267: sin->sin_family = AF_INET;
1268: sin->sin_len = sizeof(*sin);
1269: sin->sin_addr = dst;
1270:
1271: rtalloc(&ipforward_rt);
1272: }
1273: if (ipforward_rt.ro_rt == 0)
1274: return ((struct in_ifaddr *)0);
1.19 mycroft 1275: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1276: }
1277:
1278: /*
1279: * Save incoming source route for use in replies,
1280: * to be picked up later by ip_srcroute if the receiver is interested.
1281: */
1.13 mycroft 1282: void
1.1 cgd 1283: save_rte(option, dst)
1284: u_char *option;
1285: struct in_addr dst;
1286: {
1287: unsigned olen;
1288:
1289: olen = option[IPOPT_OLEN];
1290: #ifdef DIAGNOSTIC
1291: if (ipprintfs)
1.39 christos 1292: printf("save_rte: olen %d\n", olen);
1.89 itojun 1293: #endif /* 0 */
1.1 cgd 1294: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1295: return;
1296: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1297: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1298: ip_srcrt.dst = dst;
1299: }
1300:
1301: /*
1302: * Retrieve incoming source route for use in replies,
1303: * in the same form used by setsockopt.
1304: * The first hop is placed before the options, will be removed later.
1305: */
1306: struct mbuf *
1307: ip_srcroute()
1308: {
1.109 augustss 1309: struct in_addr *p, *q;
1310: struct mbuf *m;
1.1 cgd 1311:
1312: if (ip_nhops == 0)
1313: return ((struct mbuf *)0);
1314: m = m_get(M_DONTWAIT, MT_SOOPTS);
1315: if (m == 0)
1316: return ((struct mbuf *)0);
1317:
1.13 mycroft 1318: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1319:
1320: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1321: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1322: OPTSIZ;
1323: #ifdef DIAGNOSTIC
1324: if (ipprintfs)
1.39 christos 1325: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1326: #endif
1327:
1328: /*
1329: * First save first hop for return route
1330: */
1331: p = &ip_srcrt.route[ip_nhops - 1];
1332: *(mtod(m, struct in_addr *)) = *p--;
1333: #ifdef DIAGNOSTIC
1334: if (ipprintfs)
1.39 christos 1335: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1336: #endif
1337:
1338: /*
1339: * Copy option fields and padding (nop) to mbuf.
1340: */
1341: ip_srcrt.nop = IPOPT_NOP;
1342: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1343: bcopy((caddr_t)&ip_srcrt.nop,
1344: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1345: q = (struct in_addr *)(mtod(m, caddr_t) +
1346: sizeof(struct in_addr) + OPTSIZ);
1347: #undef OPTSIZ
1348: /*
1349: * Record return path as an IP source route,
1350: * reversing the path (pointers are now aligned).
1351: */
1352: while (p >= ip_srcrt.route) {
1353: #ifdef DIAGNOSTIC
1354: if (ipprintfs)
1.39 christos 1355: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1356: #endif
1357: *q++ = *p--;
1358: }
1359: /*
1360: * Last hop goes to final destination.
1361: */
1362: *q = ip_srcrt.dst;
1363: #ifdef DIAGNOSTIC
1364: if (ipprintfs)
1.39 christos 1365: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1366: #endif
1367: return (m);
1368: }
1369:
1370: /*
1371: * Strip out IP options, at higher
1372: * level protocol in the kernel.
1373: * Second argument is buffer to which options
1374: * will be moved, and return value is their length.
1375: * XXX should be deleted; last arg currently ignored.
1376: */
1.8 mycroft 1377: void
1.1 cgd 1378: ip_stripoptions(m, mopt)
1.109 augustss 1379: struct mbuf *m;
1.1 cgd 1380: struct mbuf *mopt;
1381: {
1.109 augustss 1382: int i;
1.1 cgd 1383: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1384: caddr_t opts;
1.1 cgd 1385: int olen;
1386:
1.79 mycroft 1387: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1388: opts = (caddr_t)(ip + 1);
1389: i = m->m_len - (sizeof (struct ip) + olen);
1390: bcopy(opts + olen, opts, (unsigned)i);
1391: m->m_len -= olen;
1392: if (m->m_flags & M_PKTHDR)
1393: m->m_pkthdr.len -= olen;
1.79 mycroft 1394: ip->ip_len -= olen;
1395: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1396: }
1397:
1.23 mycroft 1398: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1399: 0, 0, 0, 0,
1400: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1401: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1402: EMSGSIZE, EHOSTUNREACH, 0, 0,
1403: 0, 0, 0, 0,
1404: ENOPROTOOPT
1405: };
1406:
1407: /*
1408: * Forward a packet. If some error occurs return the sender
1409: * an icmp packet. Note we can't always generate a meaningful
1410: * icmp message because icmp doesn't have a large enough repertoire
1411: * of codes and types.
1412: *
1413: * If not forwarding, just drop the packet. This could be confusing
1414: * if ipforwarding was zero but some routing protocol was advancing
1415: * us as a gateway to somewhere. However, we must let the routing
1416: * protocol deal with that.
1417: *
1418: * The srcrt parameter indicates whether the packet is being forwarded
1419: * via a source route.
1420: */
1.13 mycroft 1421: void
1.1 cgd 1422: ip_forward(m, srcrt)
1423: struct mbuf *m;
1424: int srcrt;
1425: {
1.109 augustss 1426: struct ip *ip = mtod(m, struct ip *);
1427: struct sockaddr_in *sin;
1428: struct rtentry *rt;
1.28 christos 1429: int error, type = 0, code = 0;
1.1 cgd 1430: struct mbuf *mcopy;
1.13 mycroft 1431: n_long dest;
1432: struct ifnet *destifp;
1.89 itojun 1433: #ifdef IPSEC
1434: struct ifnet dummyifp;
1435: #endif
1.1 cgd 1436:
1.13 mycroft 1437: dest = 0;
1.1 cgd 1438: #ifdef DIAGNOSTIC
1439: if (ipprintfs)
1.70 thorpej 1440: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1441: ntohl(ip->ip_src.s_addr),
1442: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1443: #endif
1.93 sommerfe 1444: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1445: ipstat.ips_cantforward++;
1446: m_freem(m);
1447: return;
1448: }
1449: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1450: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1451: return;
1452: }
1453: ip->ip_ttl -= IPTTLDEC;
1454:
1.19 mycroft 1455: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1456: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1457: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1458: if (ipforward_rt.ro_rt) {
1459: RTFREE(ipforward_rt.ro_rt);
1460: ipforward_rt.ro_rt = 0;
1461: }
1462: sin->sin_family = AF_INET;
1.35 mycroft 1463: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1464: sin->sin_addr = ip->ip_dst;
1465:
1466: rtalloc(&ipforward_rt);
1467: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1468: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1469: return;
1470: }
1471: rt = ipforward_rt.ro_rt;
1472: }
1473:
1474: /*
1.34 mycroft 1475: * Save at most 68 bytes of the packet in case
1.1 cgd 1476: * we need to generate an ICMP message to the src.
1.119 itojun 1477: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1478: */
1.119 itojun 1479: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1480: if (mcopy)
1481: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1482:
1483: /*
1484: * If forwarding packet using same interface that it came in on,
1485: * perhaps should send a redirect to sender to shortcut a hop.
1486: * Only send redirect if source is sending directly to us,
1487: * and if packet was not source routed (or has any options).
1488: * Also, don't send redirect if forwarding using a default route
1489: * or a route modified by a redirect.
1490: */
1491: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1492: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1493: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1494: ipsendredirects && !srcrt) {
1.19 mycroft 1495: if (rt->rt_ifa &&
1496: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1497: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1498: if (rt->rt_flags & RTF_GATEWAY)
1499: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1500: else
1501: dest = ip->ip_dst.s_addr;
1502: /*
1503: * Router requirements says to only send host
1504: * redirects.
1505: */
1506: type = ICMP_REDIRECT;
1507: code = ICMP_REDIRECT_HOST;
1.1 cgd 1508: #ifdef DIAGNOSTIC
1.77 thorpej 1509: if (ipprintfs)
1510: printf("redirect (%d) to %x\n", code,
1511: (u_int32_t)dest);
1.1 cgd 1512: #endif
1513: }
1514: }
1515:
1.89 itojun 1516: #ifdef IPSEC
1.103 itojun 1517: /* Don't lookup socket in forwading case */
1.127 itojun 1518: (void)ipsec_setsocket(m, NULL);
1.103 itojun 1519: #endif
1.27 thorpej 1520: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1521: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1522: if (error)
1523: ipstat.ips_cantforward++;
1524: else {
1525: ipstat.ips_forward++;
1526: if (type)
1527: ipstat.ips_redirectsent++;
1528: else {
1.63 matt 1529: if (mcopy) {
1530: #ifdef GATEWAY
1.64 thorpej 1531: if (mcopy->m_flags & M_CANFASTFWD)
1532: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1533: #endif
1.1 cgd 1534: m_freem(mcopy);
1.63 matt 1535: }
1.1 cgd 1536: return;
1537: }
1538: }
1539: if (mcopy == NULL)
1540: return;
1.13 mycroft 1541: destifp = NULL;
1542:
1.1 cgd 1543: switch (error) {
1544:
1545: case 0: /* forwarded, but need redirect */
1546: /* type, code set above */
1547: break;
1548:
1549: case ENETUNREACH: /* shouldn't happen, checked above */
1550: case EHOSTUNREACH:
1551: case ENETDOWN:
1552: case EHOSTDOWN:
1553: default:
1554: type = ICMP_UNREACH;
1555: code = ICMP_UNREACH_HOST;
1556: break;
1557:
1558: case EMSGSIZE:
1559: type = ICMP_UNREACH;
1560: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1561: #ifndef IPSEC
1.13 mycroft 1562: if (ipforward_rt.ro_rt)
1563: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1564: #else
1565: /*
1566: * If the packet is routed over IPsec tunnel, tell the
1567: * originator the tunnel MTU.
1568: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1569: * XXX quickhack!!!
1570: */
1571: if (ipforward_rt.ro_rt) {
1572: struct secpolicy *sp;
1573: int ipsecerror;
1.95 itojun 1574: size_t ipsechdr;
1.89 itojun 1575: struct route *ro;
1576:
1577: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1578: IPSEC_DIR_OUTBOUND,
1579: IP_FORWARDING,
1580: &ipsecerror);
1.89 itojun 1581:
1582: if (sp == NULL)
1583: destifp = ipforward_rt.ro_rt->rt_ifp;
1584: else {
1585: /* count IPsec header size */
1.95 itojun 1586: ipsechdr = ipsec4_hdrsiz(mcopy,
1587: IPSEC_DIR_OUTBOUND,
1588: NULL);
1.89 itojun 1589:
1590: /*
1591: * find the correct route for outer IPv4
1592: * header, compute tunnel MTU.
1593: *
1594: * XXX BUG ALERT
1595: * The "dummyifp" code relies upon the fact
1596: * that icmp_error() touches only ifp->if_mtu.
1597: */
1598: /*XXX*/
1599: destifp = NULL;
1600: if (sp->req != NULL
1.95 itojun 1601: && sp->req->sav != NULL
1602: && sp->req->sav->sah != NULL) {
1603: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1604: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1605: dummyifp.if_mtu =
1606: ro->ro_rt->rt_ifp->if_mtu;
1607: dummyifp.if_mtu -= ipsechdr;
1608: destifp = &dummyifp;
1609: }
1610: }
1611:
1612: key_freesp(sp);
1613: }
1614: }
1615: #endif /*IPSEC*/
1.1 cgd 1616: ipstat.ips_cantfrag++;
1617: break;
1618:
1619: case ENOBUFS:
1620: type = ICMP_SOURCEQUENCH;
1621: code = 0;
1622: break;
1623: }
1.13 mycroft 1624: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1625: }
1626:
1627: void
1628: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1629: struct inpcb *inp;
1630: struct mbuf **mp;
1631: struct ip *ip;
1632: struct mbuf *m;
1.44 thorpej 1633: {
1634:
1635: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1636: struct timeval tv;
1637:
1638: microtime(&tv);
1639: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1640: SCM_TIMESTAMP, SOL_SOCKET);
1641: if (*mp)
1642: mp = &(*mp)->m_next;
1643: }
1644: if (inp->inp_flags & INP_RECVDSTADDR) {
1645: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1646: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1647: if (*mp)
1648: mp = &(*mp)->m_next;
1649: }
1650: #ifdef notyet
1651: /*
1652: * XXX
1653: * Moving these out of udp_input() made them even more broken
1654: * than they already were.
1655: * - fenner@parc.xerox.com
1656: */
1657: /* options were tossed already */
1658: if (inp->inp_flags & INP_RECVOPTS) {
1659: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1660: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1661: if (*mp)
1662: mp = &(*mp)->m_next;
1663: }
1664: /* ip_srcroute doesn't do what we want here, need to fix */
1665: if (inp->inp_flags & INP_RECVRETOPTS) {
1666: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1667: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1668: if (*mp)
1669: mp = &(*mp)->m_next;
1670: }
1671: #endif
1672: if (inp->inp_flags & INP_RECVIF) {
1673: struct sockaddr_dl sdl;
1674:
1675: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1676: sdl.sdl_family = AF_LINK;
1677: sdl.sdl_index = m->m_pkthdr.rcvif ?
1678: m->m_pkthdr.rcvif->if_index : 0;
1679: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1680: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1681: IP_RECVIF, IPPROTO_IP);
1682: if (*mp)
1683: mp = &(*mp)->m_next;
1684: }
1.13 mycroft 1685: }
1686:
1687: int
1688: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1689: int *name;
1690: u_int namelen;
1691: void *oldp;
1692: size_t *oldlenp;
1693: void *newp;
1694: size_t newlen;
1695: {
1.88 sommerfe 1696: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1697:
1.54 lukem 1698: int error, old;
1699:
1.13 mycroft 1700: /* All sysctl names at this level are terminal. */
1701: if (namelen != 1)
1702: return (ENOTDIR);
1703:
1704: switch (name[0]) {
1705: case IPCTL_FORWARDING:
1706: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1707: case IPCTL_SENDREDIRECTS:
1708: return (sysctl_int(oldp, oldlenp, newp, newlen,
1709: &ipsendredirects));
1710: case IPCTL_DEFTTL:
1711: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1712: #ifdef notyet
1713: case IPCTL_DEFMTU:
1714: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1715: #endif
1.26 thorpej 1716: case IPCTL_FORWSRCRT:
1.47 cjs 1717: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1718: if (securelevel > 0)
1.46 cjs 1719: return (sysctl_rdint(oldp, oldlenp, newp,
1720: ip_forwsrcrt));
1721: else
1722: return (sysctl_int(oldp, oldlenp, newp, newlen,
1723: &ip_forwsrcrt));
1.27 thorpej 1724: case IPCTL_DIRECTEDBCAST:
1725: return (sysctl_int(oldp, oldlenp, newp, newlen,
1726: &ip_directedbcast));
1.47 cjs 1727: case IPCTL_ALLOWSRCRT:
1728: return (sysctl_int(oldp, oldlenp, newp, newlen,
1729: &ip_allowsrcrt));
1.52 thorpej 1730: case IPCTL_SUBNETSARELOCAL:
1731: return (sysctl_int(oldp, oldlenp, newp, newlen,
1732: &subnetsarelocal));
1.53 kml 1733: case IPCTL_MTUDISC:
1.60 kml 1734: error = sysctl_int(oldp, oldlenp, newp, newlen,
1735: &ip_mtudisc);
1736: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1737: ip_mtudisc_timeout_q =
1738: rt_timer_queue_create(ip_mtudisc_timeout);
1739: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1740: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1741: ip_mtudisc_timeout_q = NULL;
1742: }
1743: return error;
1.54 lukem 1744: case IPCTL_ANONPORTMIN:
1745: old = anonportmin;
1746: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1747: if (anonportmin >= anonportmax || anonportmin < 0
1748: || anonportmin > 65535
1.54 lukem 1749: #ifndef IPNOPRIVPORTS
1750: || anonportmin < IPPORT_RESERVED
1751: #endif
1752: ) {
1753: anonportmin = old;
1754: return (EINVAL);
1755: }
1756: return (error);
1757: case IPCTL_ANONPORTMAX:
1758: old = anonportmax;
1759: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1760: if (anonportmin >= anonportmax || anonportmax < 0
1761: || anonportmax > 65535
1.54 lukem 1762: #ifndef IPNOPRIVPORTS
1763: || anonportmax < IPPORT_RESERVED
1764: #endif
1765: ) {
1766: anonportmax = old;
1767: return (EINVAL);
1768: }
1.60 kml 1769: return (error);
1770: case IPCTL_MTUDISCTIMEOUT:
1771: error = sysctl_int(oldp, oldlenp, newp, newlen,
1772: &ip_mtudisc_timeout);
1773: if (ip_mtudisc_timeout_q != NULL)
1774: rt_timer_queue_change(ip_mtudisc_timeout_q,
1775: ip_mtudisc_timeout);
1.54 lukem 1776: return (error);
1.65 matt 1777: #ifdef GATEWAY
1778: case IPCTL_MAXFLOWS:
1.67 thorpej 1779: {
1780: int s;
1781:
1.65 matt 1782: error = sysctl_int(oldp, oldlenp, newp, newlen,
1783: &ip_maxflows);
1.67 thorpej 1784: s = splsoftnet();
1.65 matt 1785: ipflow_reap(0);
1.67 thorpej 1786: splx(s);
1.65 matt 1787: return (error);
1.67 thorpej 1788: }
1.89 itojun 1789: #endif
1.90 itojun 1790: case IPCTL_HOSTZEROBROADCAST:
1791: return (sysctl_int(oldp, oldlenp, newp, newlen,
1792: &hostzeroisbroadcast));
1.89 itojun 1793: #if NGIF > 0
1794: case IPCTL_GIF_TTL:
1795: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1796: &ip_gif_ttl));
1.117 tron 1797: #endif
1798:
1799: #ifndef IPNOPRIVPORTS
1800: case IPCTL_LOWPORTMIN:
1801: old = lowportmin;
1802: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1803: if (lowportmin >= lowportmax
1804: || lowportmin > IPPORT_RESERVEDMAX
1805: || lowportmin < IPPORT_RESERVEDMIN
1806: ) {
1807: lowportmin = old;
1808: return (EINVAL);
1809: }
1810: return (error);
1811: case IPCTL_LOWPORTMAX:
1812: old = lowportmax;
1813: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1814: if (lowportmin >= lowportmax
1815: || lowportmax > IPPORT_RESERVEDMAX
1816: || lowportmax < IPPORT_RESERVEDMIN
1817: ) {
1818: lowportmax = old;
1819: return (EINVAL);
1820: }
1821: return (error);
1.65 matt 1822: #endif
1.131 itojun 1823:
1824: case IPCTL_MAXFRAGPACKETS:
1825: return (sysctl_int(oldp, oldlenp, newp, newlen,
1826: &ip_maxfragpackets));
1.88 sommerfe 1827:
1.13 mycroft 1828: default:
1829: return (EOPNOTSUPP);
1830: }
1831: /* NOTREACHED */
1.1 cgd 1832: }
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