Annotation of src/sys/netinet/ip_input.c, Revision 1.125
1.124 thorpej 1: /* $NetBSD: ip_input.c,v 1.123 2000/12/14 17:36:44 thorpej 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. */
1.125 ! wiz 322: inet_pfil_hook.ph_key = (void *)(u_long) AF_INET;
! 323: inet_pfil_hook.ph_dlt = DLT_RAW;
1.121 thorpej 324: i = pfil_head_register(&inet_pfil_hook);
325: if (i != 0)
326: printf("ip_init: WARNING: unable to register pfil hook, "
327: "error %d\n", i);
328: #endif /* PFIL_HOOKS */
1.1 cgd 329: }
330:
331: struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
332: struct route ipforward_rt;
333:
334: /*
1.89 itojun 335: * IP software interrupt routine
336: */
337: void
338: ipintr()
339: {
340: int s;
341: struct mbuf *m;
342:
343: while (1) {
344: s = splimp();
345: IF_DEQUEUE(&ipintrq, m);
346: splx(s);
347: if (m == 0)
348: return;
349: ip_input(m);
350: }
351: }
352:
353: /*
1.1 cgd 354: * Ip input routine. Checksum and byte swap header. If fragmented
355: * try to reassemble. Process options. Pass to next level.
356: */
1.8 mycroft 357: void
1.89 itojun 358: ip_input(struct mbuf *m)
1.1 cgd 359: {
1.109 augustss 360: struct ip *ip = NULL;
361: struct ipq *fp;
362: struct in_ifaddr *ia;
363: struct ifaddr *ifa;
1.25 cgd 364: struct ipqent *ipqe;
1.89 itojun 365: int hlen = 0, mff, len;
1.100 itojun 366: int downmatch;
1.1 cgd 367:
368: #ifdef DIAGNOSTIC
369: if ((m->m_flags & M_PKTHDR) == 0)
370: panic("ipintr no HDR");
371: #endif
1.89 itojun 372: #ifdef IPSEC
373: /*
374: * should the inner packet be considered authentic?
375: * see comment in ah4_input().
376: */
377: if (m) {
378: m->m_flags &= ~M_AUTHIPHDR;
379: m->m_flags &= ~M_AUTHIPDGM;
380: }
381: #endif
1.1 cgd 382: /*
383: * If no IP addresses have been set yet but the interfaces
384: * are receiving, can't do anything with incoming packets yet.
385: */
1.22 mycroft 386: if (in_ifaddr.tqh_first == 0)
1.1 cgd 387: goto bad;
388: ipstat.ips_total++;
389: if (m->m_len < sizeof (struct ip) &&
390: (m = m_pullup(m, sizeof (struct ip))) == 0) {
391: ipstat.ips_toosmall++;
1.89 itojun 392: return;
1.1 cgd 393: }
394: ip = mtod(m, struct ip *);
1.13 mycroft 395: if (ip->ip_v != IPVERSION) {
396: ipstat.ips_badvers++;
397: goto bad;
398: }
1.1 cgd 399: hlen = ip->ip_hl << 2;
400: if (hlen < sizeof(struct ip)) { /* minimum header length */
401: ipstat.ips_badhlen++;
402: goto bad;
403: }
404: if (hlen > m->m_len) {
405: if ((m = m_pullup(m, hlen)) == 0) {
406: ipstat.ips_badhlen++;
1.89 itojun 407: return;
1.1 cgd 408: }
409: ip = mtod(m, struct ip *);
410: }
1.98 thorpej 411:
1.85 hwr 412: /*
1.99 thorpej 413: * RFC1122: packets with a multicast source address are
1.98 thorpej 414: * not allowed.
1.85 hwr 415: */
416: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.98 thorpej 417: /* XXX stat */
1.85 hwr 418: goto bad;
419: }
420:
1.78 mycroft 421: if (in_cksum(m, hlen) != 0) {
1.1 cgd 422: ipstat.ips_badsum++;
423: goto bad;
424: }
425:
1.121 thorpej 426: /* Retrieve the packet length. */
427: len = ntohs(ip->ip_len);
1.81 proff 428:
429: /*
430: * Check for additional length bogosity
431: */
1.84 proff 432: if (len < hlen) {
1.81 proff 433: ipstat.ips_badlen++;
434: goto bad;
435: }
1.1 cgd 436:
437: /*
438: * Check that the amount of data in the buffers
439: * is as at least much as the IP header would have us expect.
440: * Trim mbufs if longer than we expect.
441: * Drop packet if shorter than we expect.
442: */
1.35 mycroft 443: if (m->m_pkthdr.len < len) {
1.1 cgd 444: ipstat.ips_tooshort++;
445: goto bad;
446: }
1.35 mycroft 447: if (m->m_pkthdr.len > len) {
1.1 cgd 448: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 449: m->m_len = len;
450: m->m_pkthdr.len = len;
1.1 cgd 451: } else
1.35 mycroft 452: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 453: }
454:
1.94 itojun 455: #ifdef IPSEC
456: /* ipflow (IP fast fowarding) is not compatible with IPsec. */
457: m->m_flags &= ~M_CANFASTFWD;
458: #else
1.64 thorpej 459: /*
460: * Assume that we can create a fast-forward IP flow entry
461: * based on this packet.
462: */
463: m->m_flags |= M_CANFASTFWD;
1.94 itojun 464: #endif
1.64 thorpej 465:
1.36 mrg 466: #ifdef PFIL_HOOKS
1.33 mrg 467: /*
1.64 thorpej 468: * Run through list of hooks for input packets. If there are any
469: * filters which require that additional packets in the flow are
470: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
471: * Note that filters must _never_ set this flag, as another filter
472: * in the list may have previously cleared it.
1.33 mrg 473: */
1.121 thorpej 474: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
475: PFIL_IN) != 0)
476: return;
477: if (m == NULL)
478: return;
479: ip = mtod(m, struct ip *);
1.36 mrg 480: #endif /* PFIL_HOOKS */
1.123 thorpej 481:
482: #ifdef ALTQ
483: /* XXX Temporary until ALTQ is changed to use a pfil hook */
484: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
485: /* packet dropped by traffic conditioner */
486: return;
487: }
488: #endif
1.121 thorpej 489:
490: /*
491: * Convert fields to host representation.
492: */
493: NTOHS(ip->ip_len);
494: NTOHS(ip->ip_off);
1.33 mrg 495:
1.1 cgd 496: /*
497: * Process options and, if not destined for us,
498: * ship it on. ip_dooptions returns 1 when an
499: * error was detected (causing an icmp message
500: * to be sent and the original packet to be freed).
501: */
502: ip_nhops = 0; /* for source routed packets */
503: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 504: return;
1.1 cgd 505:
506: /*
507: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 508: *
509: * Traditional 4.4BSD did not consult IFF_UP at all.
510: * The behavior here is to treat addresses on !IFF_UP interface
511: * as not mine.
1.1 cgd 512: */
1.100 itojun 513: downmatch = 0;
1.97 itojun 514: for (ia = IN_IFADDR_HASH(ip->ip_dst.s_addr).lh_first;
515: ia != NULL;
516: ia = ia->ia_hash.le_next) {
517: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
518: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
519: break;
1.100 itojun 520: else
521: downmatch++;
1.97 itojun 522: }
523: }
1.86 thorpej 524: if (ia != NULL)
525: goto ours;
1.57 tls 526: if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
527: for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
528: ifa != NULL; ifa = ifa->ifa_list.tqe_next) {
529: if (ifa->ifa_addr->sa_family != AF_INET) continue;
530: ia = ifatoia(ifa);
1.35 mycroft 531: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
532: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 533: /*
534: * Look for all-0's host part (old broadcast addr),
535: * either for subnet or net.
536: */
537: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 538: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 539: goto ours;
1.57 tls 540: /*
541: * An interface with IP address zero accepts
542: * all packets that arrive on that interface.
543: */
544: if (in_nullhost(ia->ia_addr.sin_addr))
545: goto ours;
1.1 cgd 546: }
547: }
1.18 mycroft 548: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 549: struct in_multi *inm;
550: #ifdef MROUTING
551: extern struct socket *ip_mrouter;
1.10 brezak 552:
553: if (m->m_flags & M_EXT) {
554: if ((m = m_pullup(m, hlen)) == 0) {
555: ipstat.ips_toosmall++;
1.89 itojun 556: return;
1.10 brezak 557: }
558: ip = mtod(m, struct ip *);
559: }
1.4 hpeyerl 560:
561: if (ip_mrouter) {
562: /*
563: * If we are acting as a multicast router, all
564: * incoming multicast packets are passed to the
565: * kernel-level multicast forwarding function.
566: * The packet is returned (relatively) intact; if
567: * ip_mforward() returns a non-zero value, the packet
568: * must be discarded, else it may be accepted below.
569: *
570: * (The IP ident field is put in the same byte order
571: * as expected when ip_mforward() is called from
572: * ip_output().)
573: */
1.13 mycroft 574: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
575: ipstat.ips_cantforward++;
1.4 hpeyerl 576: m_freem(m);
1.89 itojun 577: return;
1.4 hpeyerl 578: }
579:
580: /*
581: * The process-level routing demon needs to receive
582: * all multicast IGMP packets, whether or not this
583: * host belongs to their destination groups.
584: */
585: if (ip->ip_p == IPPROTO_IGMP)
586: goto ours;
1.13 mycroft 587: ipstat.ips_forward++;
1.4 hpeyerl 588: }
589: #endif
590: /*
591: * See if we belong to the destination multicast group on the
592: * arrival interface.
593: */
594: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
595: if (inm == NULL) {
1.13 mycroft 596: ipstat.ips_cantforward++;
1.4 hpeyerl 597: m_freem(m);
1.89 itojun 598: return;
1.4 hpeyerl 599: }
600: goto ours;
601: }
1.19 mycroft 602: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 603: in_nullhost(ip->ip_dst))
1.1 cgd 604: goto ours;
605:
606: /*
607: * Not for us; forward if possible and desirable.
608: */
609: if (ipforwarding == 0) {
610: ipstat.ips_cantforward++;
611: m_freem(m);
1.100 itojun 612: } else {
613: /*
614: * If ip_dst matched any of my address on !IFF_UP interface,
615: * and there's no IFF_UP interface that matches ip_dst,
616: * send icmp unreach. Forwarding it will result in in-kernel
617: * forwarding loop till TTL goes to 0.
618: */
619: if (downmatch) {
620: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
621: ipstat.ips_cantforward++;
622: return;
623: }
1.1 cgd 624: ip_forward(m, 0);
1.100 itojun 625: }
1.89 itojun 626: return;
1.1 cgd 627:
628: ours:
629: /*
630: * If offset or IP_MF are set, must reassemble.
631: * Otherwise, nothing need be done.
632: * (We could look in the reassembly queue to see
633: * if the packet was previously fragmented,
634: * but it's not worth the time; just let them time out.)
635: */
1.37 perry 636: if (ip->ip_off & ~(IP_DF|IP_RF)) {
1.1 cgd 637: /*
638: * Look for queue of fragments
639: * of this datagram.
640: */
1.75 thorpej 641: IPQ_LOCK();
1.25 cgd 642: for (fp = ipq.lh_first; fp != NULL; fp = fp->ipq_q.le_next)
1.1 cgd 643: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 644: in_hosteq(ip->ip_src, fp->ipq_src) &&
645: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.1 cgd 646: ip->ip_p == fp->ipq_p)
647: goto found;
648: fp = 0;
649: found:
650:
651: /*
652: * Adjust ip_len to not reflect header,
1.25 cgd 653: * set ipqe_mff if more fragments are expected,
1.1 cgd 654: * convert offset of this to bytes.
655: */
656: ip->ip_len -= hlen;
1.25 cgd 657: mff = (ip->ip_off & IP_MF) != 0;
658: if (mff) {
1.16 cgd 659: /*
660: * Make sure that fragments have a data length
661: * that's a non-zero multiple of 8 bytes.
662: */
1.17 cgd 663: if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1.16 cgd 664: ipstat.ips_badfrags++;
1.75 thorpej 665: IPQ_UNLOCK();
1.16 cgd 666: goto bad;
667: }
668: }
1.1 cgd 669: ip->ip_off <<= 3;
670:
671: /*
672: * If datagram marked as having more fragments
673: * or if this is not the first fragment,
674: * attempt reassembly; if it succeeds, proceed.
675: */
1.25 cgd 676: if (mff || ip->ip_off) {
1.1 cgd 677: ipstat.ips_fragments++;
1.72 thorpej 678: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.25 cgd 679: if (ipqe == NULL) {
680: ipstat.ips_rcvmemdrop++;
1.75 thorpej 681: IPQ_UNLOCK();
1.25 cgd 682: goto bad;
683: }
684: ipqe->ipqe_mff = mff;
1.50 thorpej 685: ipqe->ipqe_m = m;
1.25 cgd 686: ipqe->ipqe_ip = ip;
1.50 thorpej 687: m = ip_reass(ipqe, fp);
1.75 thorpej 688: if (m == 0) {
689: IPQ_UNLOCK();
1.89 itojun 690: return;
1.75 thorpej 691: }
1.13 mycroft 692: ipstat.ips_reassembled++;
1.50 thorpej 693: ip = mtod(m, struct ip *);
1.74 thorpej 694: hlen = ip->ip_hl << 2;
1.79 mycroft 695: ip->ip_len += hlen;
1.1 cgd 696: } else
697: if (fp)
698: ip_freef(fp);
1.75 thorpej 699: IPQ_UNLOCK();
1.79 mycroft 700: }
1.1 cgd 701:
702: /*
703: * Switch out to protocol's input routine.
704: */
1.82 aidan 705: #if IFA_STATS
1.122 itojun 706: if (ia && ip)
707: ia->ia_ifa.ifa_data.ifad_inbytes += ip->ip_len;
1.82 aidan 708: #endif
1.1 cgd 709: ipstat.ips_delivered++;
1.89 itojun 710: {
711: int off = hlen, nh = ip->ip_p;
712:
713: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
714: return;
715: }
1.1 cgd 716: bad:
717: m_freem(m);
718: }
719:
720: /*
721: * Take incoming datagram fragment and try to
722: * reassemble it into whole datagram. If a chain for
723: * reassembly of this datagram already exists, then it
724: * is given as fp; otherwise have to make a chain.
725: */
1.50 thorpej 726: struct mbuf *
1.25 cgd 727: ip_reass(ipqe, fp)
1.109 augustss 728: struct ipqent *ipqe;
729: struct ipq *fp;
1.1 cgd 730: {
1.109 augustss 731: struct mbuf *m = ipqe->ipqe_m;
732: struct ipqent *nq, *p, *q;
1.25 cgd 733: struct ip *ip;
1.1 cgd 734: struct mbuf *t;
1.25 cgd 735: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.1 cgd 736: int i, next;
737:
1.75 thorpej 738: IPQ_LOCK_CHECK();
739:
1.1 cgd 740: /*
741: * Presence of header sizes in mbufs
742: * would confuse code below.
743: */
744: m->m_data += hlen;
745: m->m_len -= hlen;
746:
747: /*
748: * If first fragment to arrive, create a reassembly queue.
749: */
750: if (fp == 0) {
1.50 thorpej 751: MALLOC(fp, struct ipq *, sizeof (struct ipq),
752: M_FTABLE, M_NOWAIT);
753: if (fp == NULL)
1.1 cgd 754: goto dropfrag;
1.25 cgd 755: LIST_INSERT_HEAD(&ipq, fp, ipq_q);
1.1 cgd 756: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 757: fp->ipq_p = ipqe->ipqe_ip->ip_p;
758: fp->ipq_id = ipqe->ipqe_ip->ip_id;
759: LIST_INIT(&fp->ipq_fragq);
760: fp->ipq_src = ipqe->ipqe_ip->ip_src;
761: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
762: p = NULL;
1.1 cgd 763: goto insert;
764: }
765:
766: /*
767: * Find a segment which begins after this one does.
768: */
1.25 cgd 769: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
770: p = q, q = q->ipqe_q.le_next)
771: if (q->ipqe_ip->ip_off > ipqe->ipqe_ip->ip_off)
1.1 cgd 772: break;
773:
774: /*
775: * If there is a preceding segment, it may provide some of
776: * our data already. If so, drop the data from the incoming
777: * segment. If it provides all of our data, drop us.
778: */
1.25 cgd 779: if (p != NULL) {
780: i = p->ipqe_ip->ip_off + p->ipqe_ip->ip_len -
781: ipqe->ipqe_ip->ip_off;
1.1 cgd 782: if (i > 0) {
1.25 cgd 783: if (i >= ipqe->ipqe_ip->ip_len)
1.1 cgd 784: goto dropfrag;
1.50 thorpej 785: m_adj(ipqe->ipqe_m, i);
1.25 cgd 786: ipqe->ipqe_ip->ip_off += i;
787: ipqe->ipqe_ip->ip_len -= i;
1.1 cgd 788: }
789: }
790:
791: /*
792: * While we overlap succeeding segments trim them or,
793: * if they are completely covered, dequeue them.
794: */
1.25 cgd 795: for (; q != NULL && ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len >
796: q->ipqe_ip->ip_off; q = nq) {
797: i = (ipqe->ipqe_ip->ip_off + ipqe->ipqe_ip->ip_len) -
798: q->ipqe_ip->ip_off;
799: if (i < q->ipqe_ip->ip_len) {
800: q->ipqe_ip->ip_len -= i;
801: q->ipqe_ip->ip_off += i;
1.50 thorpej 802: m_adj(q->ipqe_m, i);
1.1 cgd 803: break;
804: }
1.25 cgd 805: nq = q->ipqe_q.le_next;
1.50 thorpej 806: m_freem(q->ipqe_m);
1.25 cgd 807: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 808: pool_put(&ipqent_pool, q);
1.1 cgd 809: }
810:
811: insert:
812: /*
813: * Stick new segment in its place;
814: * check for complete reassembly.
815: */
1.25 cgd 816: if (p == NULL) {
817: LIST_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
818: } else {
819: LIST_INSERT_AFTER(p, ipqe, ipqe_q);
820: }
1.1 cgd 821: next = 0;
1.25 cgd 822: for (p = NULL, q = fp->ipq_fragq.lh_first; q != NULL;
823: p = q, q = q->ipqe_q.le_next) {
824: if (q->ipqe_ip->ip_off != next)
1.1 cgd 825: return (0);
1.25 cgd 826: next += q->ipqe_ip->ip_len;
1.1 cgd 827: }
1.25 cgd 828: if (p->ipqe_mff)
1.1 cgd 829: return (0);
830:
831: /*
1.41 thorpej 832: * Reassembly is complete. Check for a bogus message size and
833: * concatenate fragments.
1.1 cgd 834: */
1.25 cgd 835: q = fp->ipq_fragq.lh_first;
836: ip = q->ipqe_ip;
1.41 thorpej 837: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
838: ipstat.ips_toolong++;
839: ip_freef(fp);
840: return (0);
841: }
1.50 thorpej 842: m = q->ipqe_m;
1.1 cgd 843: t = m->m_next;
844: m->m_next = 0;
845: m_cat(m, t);
1.25 cgd 846: nq = q->ipqe_q.le_next;
1.72 thorpej 847: pool_put(&ipqent_pool, q);
1.25 cgd 848: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 849: t = q->ipqe_m;
1.25 cgd 850: nq = q->ipqe_q.le_next;
1.72 thorpej 851: pool_put(&ipqent_pool, q);
1.1 cgd 852: m_cat(m, t);
853: }
854:
855: /*
856: * Create header for new ip packet by
857: * modifying header of first packet;
858: * dequeue and discard fragment reassembly header.
859: * Make header visible.
860: */
861: ip->ip_len = next;
1.25 cgd 862: ip->ip_src = fp->ipq_src;
863: ip->ip_dst = fp->ipq_dst;
864: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 865: FREE(fp, M_FTABLE);
1.1 cgd 866: m->m_len += (ip->ip_hl << 2);
867: m->m_data -= (ip->ip_hl << 2);
868: /* some debugging cruft by sklower, below, will go away soon */
869: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 870: int plen = 0;
1.50 thorpej 871: for (t = m; t; t = t->m_next)
872: plen += t->m_len;
873: m->m_pkthdr.len = plen;
1.1 cgd 874: }
1.50 thorpej 875: return (m);
1.1 cgd 876:
877: dropfrag:
878: ipstat.ips_fragdropped++;
879: m_freem(m);
1.72 thorpej 880: pool_put(&ipqent_pool, ipqe);
1.1 cgd 881: return (0);
882: }
883:
884: /*
885: * Free a fragment reassembly header and all
886: * associated datagrams.
887: */
1.8 mycroft 888: void
1.1 cgd 889: ip_freef(fp)
890: struct ipq *fp;
891: {
1.109 augustss 892: struct ipqent *q, *p;
1.1 cgd 893:
1.75 thorpej 894: IPQ_LOCK_CHECK();
895:
1.25 cgd 896: for (q = fp->ipq_fragq.lh_first; q != NULL; q = p) {
897: p = q->ipqe_q.le_next;
1.50 thorpej 898: m_freem(q->ipqe_m);
1.25 cgd 899: LIST_REMOVE(q, ipqe_q);
1.72 thorpej 900: pool_put(&ipqent_pool, q);
1.1 cgd 901: }
1.25 cgd 902: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 903: FREE(fp, M_FTABLE);
1.1 cgd 904: }
905:
906: /*
907: * IP timer processing;
908: * if a timer expires on a reassembly
909: * queue, discard it.
910: */
1.8 mycroft 911: void
1.1 cgd 912: ip_slowtimo()
913: {
1.109 augustss 914: struct ipq *fp, *nfp;
1.24 mycroft 915: int s = splsoftnet();
1.1 cgd 916:
1.75 thorpej 917: IPQ_LOCK();
1.25 cgd 918: for (fp = ipq.lh_first; fp != NULL; fp = nfp) {
919: nfp = fp->ipq_q.le_next;
920: if (--fp->ipq_ttl == 0) {
1.1 cgd 921: ipstat.ips_fragtimeout++;
1.25 cgd 922: ip_freef(fp);
1.1 cgd 923: }
924: }
1.75 thorpej 925: IPQ_UNLOCK();
1.63 matt 926: #ifdef GATEWAY
927: ipflow_slowtimo();
928: #endif
1.1 cgd 929: splx(s);
930: }
931:
932: /*
933: * Drain off all datagram fragments.
934: */
1.8 mycroft 935: void
1.1 cgd 936: ip_drain()
937: {
938:
1.75 thorpej 939: /*
940: * We may be called from a device's interrupt context. If
941: * the ipq is already busy, just bail out now.
942: */
943: if (ipq_lock_try() == 0)
944: return;
945:
1.25 cgd 946: while (ipq.lh_first != NULL) {
1.1 cgd 947: ipstat.ips_fragdropped++;
1.25 cgd 948: ip_freef(ipq.lh_first);
1.1 cgd 949: }
1.75 thorpej 950:
951: IPQ_UNLOCK();
1.1 cgd 952: }
953:
954: /*
955: * Do option processing on a datagram,
956: * possibly discarding it if bad options are encountered,
957: * or forwarding it if source-routed.
958: * Returns 1 if packet has been forwarded/freed,
959: * 0 if the packet should be processed further.
960: */
1.8 mycroft 961: int
1.1 cgd 962: ip_dooptions(m)
963: struct mbuf *m;
964: {
1.109 augustss 965: struct ip *ip = mtod(m, struct ip *);
966: u_char *cp, *cp0;
967: struct ip_timestamp *ipt;
968: struct in_ifaddr *ia;
1.1 cgd 969: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 970: struct in_addr dst;
1.1 cgd 971: n_time ntime;
972:
1.13 mycroft 973: dst = ip->ip_dst;
1.1 cgd 974: cp = (u_char *)(ip + 1);
975: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
976: for (; cnt > 0; cnt -= optlen, cp += optlen) {
977: opt = cp[IPOPT_OPTVAL];
978: if (opt == IPOPT_EOL)
979: break;
980: if (opt == IPOPT_NOP)
981: optlen = 1;
982: else {
1.113 itojun 983: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
984: code = &cp[IPOPT_OLEN] - (u_char *)ip;
985: goto bad;
986: }
1.1 cgd 987: optlen = cp[IPOPT_OLEN];
1.114 itojun 988: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 989: code = &cp[IPOPT_OLEN] - (u_char *)ip;
990: goto bad;
991: }
992: }
993: switch (opt) {
994:
995: default:
996: break;
997:
998: /*
999: * Source routing with record.
1000: * Find interface with current destination address.
1001: * If none on this machine then drop if strictly routed,
1002: * or do nothing if loosely routed.
1003: * Record interface address and bring up next address
1004: * component. If strictly routed make sure next
1005: * address is on directly accessible net.
1006: */
1007: case IPOPT_LSRR:
1008: case IPOPT_SSRR:
1.47 cjs 1009: if (ip_allowsrcrt == 0) {
1010: type = ICMP_UNREACH;
1011: code = ICMP_UNREACH_NET_PROHIB;
1012: goto bad;
1013: }
1.114 itojun 1014: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1015: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1016: goto bad;
1017: }
1.1 cgd 1018: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1019: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1020: goto bad;
1021: }
1022: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1023: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1024: if (ia == 0) {
1025: if (opt == IPOPT_SSRR) {
1026: type = ICMP_UNREACH;
1027: code = ICMP_UNREACH_SRCFAIL;
1028: goto bad;
1029: }
1030: /*
1031: * Loose routing, and not at next destination
1032: * yet; nothing to do except forward.
1033: */
1034: break;
1035: }
1036: off--; /* 0 origin */
1.112 sommerfe 1037: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1038: /*
1039: * End of source route. Should be for us.
1040: */
1041: save_rte(cp, ip->ip_src);
1042: break;
1043: }
1044: /*
1045: * locate outgoing interface
1046: */
1047: bcopy((caddr_t)(cp + off), (caddr_t)&ipaddr.sin_addr,
1048: sizeof(ipaddr.sin_addr));
1.96 thorpej 1049: if (opt == IPOPT_SSRR)
1050: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1051: else
1.1 cgd 1052: ia = ip_rtaddr(ipaddr.sin_addr);
1053: if (ia == 0) {
1054: type = ICMP_UNREACH;
1055: code = ICMP_UNREACH_SRCFAIL;
1056: goto bad;
1057: }
1058: ip->ip_dst = ipaddr.sin_addr;
1.20 mycroft 1059: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1060: (caddr_t)(cp + off), sizeof(struct in_addr));
1061: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1062: /*
1063: * Let ip_intr's mcast routing check handle mcast pkts
1064: */
1.18 mycroft 1065: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1066: break;
1067:
1068: case IPOPT_RR:
1.114 itojun 1069: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1070: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1071: goto bad;
1072: }
1.1 cgd 1073: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1074: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1075: goto bad;
1076: }
1077: /*
1078: * If no space remains, ignore.
1079: */
1080: off--; /* 0 origin */
1.112 sommerfe 1081: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1082: break;
1083: bcopy((caddr_t)(&ip->ip_dst), (caddr_t)&ipaddr.sin_addr,
1084: sizeof(ipaddr.sin_addr));
1085: /*
1086: * locate outgoing interface; if we're the destination,
1087: * use the incoming interface (should be same).
1088: */
1.96 thorpej 1089: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1090: == NULL &&
1091: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1092: type = ICMP_UNREACH;
1093: code = ICMP_UNREACH_HOST;
1094: goto bad;
1095: }
1.20 mycroft 1096: bcopy((caddr_t)&ia->ia_addr.sin_addr,
1.1 cgd 1097: (caddr_t)(cp + off), sizeof(struct in_addr));
1098: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1099: break;
1100:
1101: case IPOPT_TS:
1102: code = cp - (u_char *)ip;
1103: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1104: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1105: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1106: goto bad;
1.114 itojun 1107: }
1108: if (ipt->ipt_ptr < 5) {
1109: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1110: goto bad;
1111: }
1.15 cgd 1112: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1113: if (++ipt->ipt_oflw == 0) {
1114: code = (u_char *)&ipt->ipt_ptr -
1115: (u_char *)ip;
1.1 cgd 1116: goto bad;
1.114 itojun 1117: }
1.1 cgd 1118: break;
1119: }
1.104 thorpej 1120: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1121: switch (ipt->ipt_flg) {
1122:
1123: case IPOPT_TS_TSONLY:
1124: break;
1125:
1126: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1127: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1128: sizeof(struct in_addr) > ipt->ipt_len) {
1129: code = (u_char *)&ipt->ipt_ptr -
1130: (u_char *)ip;
1.1 cgd 1131: goto bad;
1.114 itojun 1132: }
1.13 mycroft 1133: ipaddr.sin_addr = dst;
1.96 thorpej 1134: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1135: m->m_pkthdr.rcvif));
1.13 mycroft 1136: if (ia == 0)
1137: continue;
1.104 thorpej 1138: bcopy(&ia->ia_addr.sin_addr,
1139: cp0, sizeof(struct in_addr));
1.1 cgd 1140: ipt->ipt_ptr += sizeof(struct in_addr);
1141: break;
1142:
1143: case IPOPT_TS_PRESPEC:
1.66 thorpej 1144: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1145: sizeof(struct in_addr) > ipt->ipt_len) {
1146: code = (u_char *)&ipt->ipt_ptr -
1147: (u_char *)ip;
1.1 cgd 1148: goto bad;
1.114 itojun 1149: }
1.104 thorpej 1150: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1151: sizeof(struct in_addr));
1.96 thorpej 1152: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1153: == NULL)
1.1 cgd 1154: continue;
1155: ipt->ipt_ptr += sizeof(struct in_addr);
1156: break;
1157:
1158: default:
1.114 itojun 1159: /* XXX can't take &ipt->ipt_flg */
1160: code = (u_char *)&ipt->ipt_ptr -
1161: (u_char *)ip + 1;
1.1 cgd 1162: goto bad;
1163: }
1164: ntime = iptime();
1.107 thorpej 1165: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1166: bcopy(cp0, (caddr_t)cp + ipt->ipt_ptr - 1,
1.1 cgd 1167: sizeof(n_time));
1168: ipt->ipt_ptr += sizeof(n_time);
1169: }
1170: }
1171: if (forward) {
1.26 thorpej 1172: if (ip_forwsrcrt == 0) {
1173: type = ICMP_UNREACH;
1174: code = ICMP_UNREACH_SRCFAIL;
1175: goto bad;
1176: }
1.1 cgd 1177: ip_forward(m, 1);
1178: return (1);
1.13 mycroft 1179: }
1180: return (0);
1.1 cgd 1181: bad:
1.13 mycroft 1182: icmp_error(m, type, code, 0, 0);
1183: ipstat.ips_badoptions++;
1.1 cgd 1184: return (1);
1185: }
1186:
1187: /*
1188: * Given address of next destination (final or next hop),
1189: * return internet address info of interface to be used to get there.
1190: */
1191: struct in_ifaddr *
1192: ip_rtaddr(dst)
1193: struct in_addr dst;
1194: {
1.109 augustss 1195: struct sockaddr_in *sin;
1.1 cgd 1196:
1.19 mycroft 1197: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1198:
1.35 mycroft 1199: if (ipforward_rt.ro_rt == 0 || !in_hosteq(dst, sin->sin_addr)) {
1.1 cgd 1200: if (ipforward_rt.ro_rt) {
1201: RTFREE(ipforward_rt.ro_rt);
1202: ipforward_rt.ro_rt = 0;
1203: }
1204: sin->sin_family = AF_INET;
1205: sin->sin_len = sizeof(*sin);
1206: sin->sin_addr = dst;
1207:
1208: rtalloc(&ipforward_rt);
1209: }
1210: if (ipforward_rt.ro_rt == 0)
1211: return ((struct in_ifaddr *)0);
1.19 mycroft 1212: return (ifatoia(ipforward_rt.ro_rt->rt_ifa));
1.1 cgd 1213: }
1214:
1215: /*
1216: * Save incoming source route for use in replies,
1217: * to be picked up later by ip_srcroute if the receiver is interested.
1218: */
1.13 mycroft 1219: void
1.1 cgd 1220: save_rte(option, dst)
1221: u_char *option;
1222: struct in_addr dst;
1223: {
1224: unsigned olen;
1225:
1226: olen = option[IPOPT_OLEN];
1227: #ifdef DIAGNOSTIC
1228: if (ipprintfs)
1.39 christos 1229: printf("save_rte: olen %d\n", olen);
1.89 itojun 1230: #endif /* 0 */
1.1 cgd 1231: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1232: return;
1233: bcopy((caddr_t)option, (caddr_t)ip_srcrt.srcopt, olen);
1234: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1235: ip_srcrt.dst = dst;
1236: }
1237:
1238: /*
1239: * Retrieve incoming source route for use in replies,
1240: * in the same form used by setsockopt.
1241: * The first hop is placed before the options, will be removed later.
1242: */
1243: struct mbuf *
1244: ip_srcroute()
1245: {
1.109 augustss 1246: struct in_addr *p, *q;
1247: struct mbuf *m;
1.1 cgd 1248:
1249: if (ip_nhops == 0)
1250: return ((struct mbuf *)0);
1251: m = m_get(M_DONTWAIT, MT_SOOPTS);
1252: if (m == 0)
1253: return ((struct mbuf *)0);
1254:
1.13 mycroft 1255: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1256:
1257: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1258: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1259: OPTSIZ;
1260: #ifdef DIAGNOSTIC
1261: if (ipprintfs)
1.39 christos 1262: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1263: #endif
1264:
1265: /*
1266: * First save first hop for return route
1267: */
1268: p = &ip_srcrt.route[ip_nhops - 1];
1269: *(mtod(m, struct in_addr *)) = *p--;
1270: #ifdef DIAGNOSTIC
1271: if (ipprintfs)
1.39 christos 1272: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1273: #endif
1274:
1275: /*
1276: * Copy option fields and padding (nop) to mbuf.
1277: */
1278: ip_srcrt.nop = IPOPT_NOP;
1279: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1280: bcopy((caddr_t)&ip_srcrt.nop,
1281: mtod(m, caddr_t) + sizeof(struct in_addr), OPTSIZ);
1282: q = (struct in_addr *)(mtod(m, caddr_t) +
1283: sizeof(struct in_addr) + OPTSIZ);
1284: #undef OPTSIZ
1285: /*
1286: * Record return path as an IP source route,
1287: * reversing the path (pointers are now aligned).
1288: */
1289: while (p >= ip_srcrt.route) {
1290: #ifdef DIAGNOSTIC
1291: if (ipprintfs)
1.39 christos 1292: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1293: #endif
1294: *q++ = *p--;
1295: }
1296: /*
1297: * Last hop goes to final destination.
1298: */
1299: *q = ip_srcrt.dst;
1300: #ifdef DIAGNOSTIC
1301: if (ipprintfs)
1.39 christos 1302: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1303: #endif
1304: return (m);
1305: }
1306:
1307: /*
1308: * Strip out IP options, at higher
1309: * level protocol in the kernel.
1310: * Second argument is buffer to which options
1311: * will be moved, and return value is their length.
1312: * XXX should be deleted; last arg currently ignored.
1313: */
1.8 mycroft 1314: void
1.1 cgd 1315: ip_stripoptions(m, mopt)
1.109 augustss 1316: struct mbuf *m;
1.1 cgd 1317: struct mbuf *mopt;
1318: {
1.109 augustss 1319: int i;
1.1 cgd 1320: struct ip *ip = mtod(m, struct ip *);
1.109 augustss 1321: caddr_t opts;
1.1 cgd 1322: int olen;
1323:
1.79 mycroft 1324: olen = (ip->ip_hl << 2) - sizeof (struct ip);
1.1 cgd 1325: opts = (caddr_t)(ip + 1);
1326: i = m->m_len - (sizeof (struct ip) + olen);
1327: bcopy(opts + olen, opts, (unsigned)i);
1328: m->m_len -= olen;
1329: if (m->m_flags & M_PKTHDR)
1330: m->m_pkthdr.len -= olen;
1.79 mycroft 1331: ip->ip_len -= olen;
1332: ip->ip_hl = sizeof (struct ip) >> 2;
1.1 cgd 1333: }
1334:
1.23 mycroft 1335: int inetctlerrmap[PRC_NCMDS] = {
1.1 cgd 1336: 0, 0, 0, 0,
1337: 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1338: EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1339: EMSGSIZE, EHOSTUNREACH, 0, 0,
1340: 0, 0, 0, 0,
1341: ENOPROTOOPT
1342: };
1343:
1344: /*
1345: * Forward a packet. If some error occurs return the sender
1346: * an icmp packet. Note we can't always generate a meaningful
1347: * icmp message because icmp doesn't have a large enough repertoire
1348: * of codes and types.
1349: *
1350: * If not forwarding, just drop the packet. This could be confusing
1351: * if ipforwarding was zero but some routing protocol was advancing
1352: * us as a gateway to somewhere. However, we must let the routing
1353: * protocol deal with that.
1354: *
1355: * The srcrt parameter indicates whether the packet is being forwarded
1356: * via a source route.
1357: */
1.13 mycroft 1358: void
1.1 cgd 1359: ip_forward(m, srcrt)
1360: struct mbuf *m;
1361: int srcrt;
1362: {
1.109 augustss 1363: struct ip *ip = mtod(m, struct ip *);
1364: struct sockaddr_in *sin;
1365: struct rtentry *rt;
1.28 christos 1366: int error, type = 0, code = 0;
1.1 cgd 1367: struct mbuf *mcopy;
1.13 mycroft 1368: n_long dest;
1369: struct ifnet *destifp;
1.89 itojun 1370: #ifdef IPSEC
1371: struct ifnet dummyifp;
1372: #endif
1.1 cgd 1373:
1.13 mycroft 1374: dest = 0;
1.1 cgd 1375: #ifdef DIAGNOSTIC
1376: if (ipprintfs)
1.70 thorpej 1377: printf("forward: src %2.2x dst %2.2x ttl %x\n",
1378: ntohl(ip->ip_src.s_addr),
1379: ntohl(ip->ip_dst.s_addr), ip->ip_ttl);
1.1 cgd 1380: #endif
1.93 sommerfe 1381: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1382: ipstat.ips_cantforward++;
1383: m_freem(m);
1384: return;
1385: }
1386: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1387: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1388: return;
1389: }
1390: ip->ip_ttl -= IPTTLDEC;
1391:
1.19 mycroft 1392: sin = satosin(&ipforward_rt.ro_dst);
1.1 cgd 1393: if ((rt = ipforward_rt.ro_rt) == 0 ||
1.35 mycroft 1394: !in_hosteq(ip->ip_dst, sin->sin_addr)) {
1.1 cgd 1395: if (ipforward_rt.ro_rt) {
1396: RTFREE(ipforward_rt.ro_rt);
1397: ipforward_rt.ro_rt = 0;
1398: }
1399: sin->sin_family = AF_INET;
1.35 mycroft 1400: sin->sin_len = sizeof(struct sockaddr_in);
1.1 cgd 1401: sin->sin_addr = ip->ip_dst;
1402:
1403: rtalloc(&ipforward_rt);
1404: if (ipforward_rt.ro_rt == 0) {
1.13 mycroft 1405: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1.1 cgd 1406: return;
1407: }
1408: rt = ipforward_rt.ro_rt;
1409: }
1410:
1411: /*
1.34 mycroft 1412: * Save at most 68 bytes of the packet in case
1.1 cgd 1413: * we need to generate an ICMP message to the src.
1.119 itojun 1414: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1415: */
1.119 itojun 1416: mcopy = m_copym(m, 0, imin((int)ip->ip_len, 68), M_DONTWAIT);
1417: if (mcopy)
1418: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1419:
1420: /*
1421: * If forwarding packet using same interface that it came in on,
1422: * perhaps should send a redirect to sender to shortcut a hop.
1423: * Only send redirect if source is sending directly to us,
1424: * and if packet was not source routed (or has any options).
1425: * Also, don't send redirect if forwarding using a default route
1426: * or a route modified by a redirect.
1427: */
1428: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1429: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.35 mycroft 1430: !in_nullhost(satosin(rt_key(rt))->sin_addr) &&
1.1 cgd 1431: ipsendredirects && !srcrt) {
1.19 mycroft 1432: if (rt->rt_ifa &&
1433: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1434: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1435: if (rt->rt_flags & RTF_GATEWAY)
1436: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1437: else
1438: dest = ip->ip_dst.s_addr;
1439: /*
1440: * Router requirements says to only send host
1441: * redirects.
1442: */
1443: type = ICMP_REDIRECT;
1444: code = ICMP_REDIRECT_HOST;
1.1 cgd 1445: #ifdef DIAGNOSTIC
1.77 thorpej 1446: if (ipprintfs)
1447: printf("redirect (%d) to %x\n", code,
1448: (u_int32_t)dest);
1.1 cgd 1449: #endif
1450: }
1451: }
1452:
1.89 itojun 1453: #ifdef IPSEC
1.103 itojun 1454: /* Don't lookup socket in forwading case */
1455: ipsec_setsocket(m, NULL);
1456: #endif
1.27 thorpej 1457: error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
1458: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), 0);
1.1 cgd 1459: if (error)
1460: ipstat.ips_cantforward++;
1461: else {
1462: ipstat.ips_forward++;
1463: if (type)
1464: ipstat.ips_redirectsent++;
1465: else {
1.63 matt 1466: if (mcopy) {
1467: #ifdef GATEWAY
1.64 thorpej 1468: if (mcopy->m_flags & M_CANFASTFWD)
1469: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1470: #endif
1.1 cgd 1471: m_freem(mcopy);
1.63 matt 1472: }
1.1 cgd 1473: return;
1474: }
1475: }
1476: if (mcopy == NULL)
1477: return;
1.13 mycroft 1478: destifp = NULL;
1479:
1.1 cgd 1480: switch (error) {
1481:
1482: case 0: /* forwarded, but need redirect */
1483: /* type, code set above */
1484: break;
1485:
1486: case ENETUNREACH: /* shouldn't happen, checked above */
1487: case EHOSTUNREACH:
1488: case ENETDOWN:
1489: case EHOSTDOWN:
1490: default:
1491: type = ICMP_UNREACH;
1492: code = ICMP_UNREACH_HOST;
1493: break;
1494:
1495: case EMSGSIZE:
1496: type = ICMP_UNREACH;
1497: code = ICMP_UNREACH_NEEDFRAG;
1.89 itojun 1498: #ifndef IPSEC
1.13 mycroft 1499: if (ipforward_rt.ro_rt)
1500: destifp = ipforward_rt.ro_rt->rt_ifp;
1.89 itojun 1501: #else
1502: /*
1503: * If the packet is routed over IPsec tunnel, tell the
1504: * originator the tunnel MTU.
1505: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1506: * XXX quickhack!!!
1507: */
1508: if (ipforward_rt.ro_rt) {
1509: struct secpolicy *sp;
1510: int ipsecerror;
1.95 itojun 1511: size_t ipsechdr;
1.89 itojun 1512: struct route *ro;
1513:
1514: sp = ipsec4_getpolicybyaddr(mcopy,
1.95 itojun 1515: IPSEC_DIR_OUTBOUND,
1516: IP_FORWARDING,
1517: &ipsecerror);
1.89 itojun 1518:
1519: if (sp == NULL)
1520: destifp = ipforward_rt.ro_rt->rt_ifp;
1521: else {
1522: /* count IPsec header size */
1.95 itojun 1523: ipsechdr = ipsec4_hdrsiz(mcopy,
1524: IPSEC_DIR_OUTBOUND,
1525: NULL);
1.89 itojun 1526:
1527: /*
1528: * find the correct route for outer IPv4
1529: * header, compute tunnel MTU.
1530: *
1531: * XXX BUG ALERT
1532: * The "dummyifp" code relies upon the fact
1533: * that icmp_error() touches only ifp->if_mtu.
1534: */
1535: /*XXX*/
1536: destifp = NULL;
1537: if (sp->req != NULL
1.95 itojun 1538: && sp->req->sav != NULL
1539: && sp->req->sav->sah != NULL) {
1540: ro = &sp->req->sav->sah->sa_route;
1.89 itojun 1541: if (ro->ro_rt && ro->ro_rt->rt_ifp) {
1542: dummyifp.if_mtu =
1543: ro->ro_rt->rt_ifp->if_mtu;
1544: dummyifp.if_mtu -= ipsechdr;
1545: destifp = &dummyifp;
1546: }
1547: }
1548:
1549: key_freesp(sp);
1550: }
1551: }
1552: #endif /*IPSEC*/
1.1 cgd 1553: ipstat.ips_cantfrag++;
1554: break;
1555:
1556: case ENOBUFS:
1557: type = ICMP_SOURCEQUENCH;
1558: code = 0;
1559: break;
1560: }
1.13 mycroft 1561: icmp_error(mcopy, type, code, dest, destifp);
1.44 thorpej 1562: }
1563:
1564: void
1565: ip_savecontrol(inp, mp, ip, m)
1.109 augustss 1566: struct inpcb *inp;
1567: struct mbuf **mp;
1568: struct ip *ip;
1569: struct mbuf *m;
1.44 thorpej 1570: {
1571:
1572: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1573: struct timeval tv;
1574:
1575: microtime(&tv);
1576: *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1577: SCM_TIMESTAMP, SOL_SOCKET);
1578: if (*mp)
1579: mp = &(*mp)->m_next;
1580: }
1581: if (inp->inp_flags & INP_RECVDSTADDR) {
1582: *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1583: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1584: if (*mp)
1585: mp = &(*mp)->m_next;
1586: }
1587: #ifdef notyet
1588: /*
1589: * XXX
1590: * Moving these out of udp_input() made them even more broken
1591: * than they already were.
1592: * - fenner@parc.xerox.com
1593: */
1594: /* options were tossed already */
1595: if (inp->inp_flags & INP_RECVOPTS) {
1596: *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1597: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1598: if (*mp)
1599: mp = &(*mp)->m_next;
1600: }
1601: /* ip_srcroute doesn't do what we want here, need to fix */
1602: if (inp->inp_flags & INP_RECVRETOPTS) {
1603: *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
1604: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1605: if (*mp)
1606: mp = &(*mp)->m_next;
1607: }
1608: #endif
1609: if (inp->inp_flags & INP_RECVIF) {
1610: struct sockaddr_dl sdl;
1611:
1612: sdl.sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]);
1613: sdl.sdl_family = AF_LINK;
1614: sdl.sdl_index = m->m_pkthdr.rcvif ?
1615: m->m_pkthdr.rcvif->if_index : 0;
1616: sdl.sdl_nlen = sdl.sdl_alen = sdl.sdl_slen = 0;
1617: *mp = sbcreatecontrol((caddr_t) &sdl, sdl.sdl_len,
1618: IP_RECVIF, IPPROTO_IP);
1619: if (*mp)
1620: mp = &(*mp)->m_next;
1621: }
1.13 mycroft 1622: }
1623:
1624: int
1625: ip_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
1626: int *name;
1627: u_int namelen;
1628: void *oldp;
1629: size_t *oldlenp;
1630: void *newp;
1631: size_t newlen;
1632: {
1.88 sommerfe 1633: extern int subnetsarelocal, hostzeroisbroadcast;
1.52 thorpej 1634:
1.54 lukem 1635: int error, old;
1636:
1.13 mycroft 1637: /* All sysctl names at this level are terminal. */
1638: if (namelen != 1)
1639: return (ENOTDIR);
1640:
1641: switch (name[0]) {
1642: case IPCTL_FORWARDING:
1643: return (sysctl_int(oldp, oldlenp, newp, newlen, &ipforwarding));
1644: case IPCTL_SENDREDIRECTS:
1645: return (sysctl_int(oldp, oldlenp, newp, newlen,
1646: &ipsendredirects));
1647: case IPCTL_DEFTTL:
1648: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_defttl));
1649: #ifdef notyet
1650: case IPCTL_DEFMTU:
1651: return (sysctl_int(oldp, oldlenp, newp, newlen, &ip_mtu));
1652: #endif
1.26 thorpej 1653: case IPCTL_FORWSRCRT:
1.47 cjs 1654: /* Don't allow this to change in a secure environment. */
1.26 thorpej 1655: if (securelevel > 0)
1.46 cjs 1656: return (sysctl_rdint(oldp, oldlenp, newp,
1657: ip_forwsrcrt));
1658: else
1659: return (sysctl_int(oldp, oldlenp, newp, newlen,
1660: &ip_forwsrcrt));
1.27 thorpej 1661: case IPCTL_DIRECTEDBCAST:
1662: return (sysctl_int(oldp, oldlenp, newp, newlen,
1663: &ip_directedbcast));
1.47 cjs 1664: case IPCTL_ALLOWSRCRT:
1665: return (sysctl_int(oldp, oldlenp, newp, newlen,
1666: &ip_allowsrcrt));
1.52 thorpej 1667: case IPCTL_SUBNETSARELOCAL:
1668: return (sysctl_int(oldp, oldlenp, newp, newlen,
1669: &subnetsarelocal));
1.53 kml 1670: case IPCTL_MTUDISC:
1.60 kml 1671: error = sysctl_int(oldp, oldlenp, newp, newlen,
1672: &ip_mtudisc);
1673: if (ip_mtudisc != 0 && ip_mtudisc_timeout_q == NULL) {
1674: ip_mtudisc_timeout_q =
1675: rt_timer_queue_create(ip_mtudisc_timeout);
1676: } else if (ip_mtudisc == 0 && ip_mtudisc_timeout_q != NULL) {
1677: rt_timer_queue_destroy(ip_mtudisc_timeout_q, TRUE);
1678: ip_mtudisc_timeout_q = NULL;
1679: }
1680: return error;
1.54 lukem 1681: case IPCTL_ANONPORTMIN:
1682: old = anonportmin;
1683: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmin);
1.118 itojun 1684: if (anonportmin >= anonportmax || anonportmin < 0
1685: || anonportmin > 65535
1.54 lukem 1686: #ifndef IPNOPRIVPORTS
1687: || anonportmin < IPPORT_RESERVED
1688: #endif
1689: ) {
1690: anonportmin = old;
1691: return (EINVAL);
1692: }
1693: return (error);
1694: case IPCTL_ANONPORTMAX:
1695: old = anonportmax;
1696: error = sysctl_int(oldp, oldlenp, newp, newlen, &anonportmax);
1.118 itojun 1697: if (anonportmin >= anonportmax || anonportmax < 0
1698: || anonportmax > 65535
1.54 lukem 1699: #ifndef IPNOPRIVPORTS
1700: || anonportmax < IPPORT_RESERVED
1701: #endif
1702: ) {
1703: anonportmax = old;
1704: return (EINVAL);
1705: }
1.60 kml 1706: return (error);
1707: case IPCTL_MTUDISCTIMEOUT:
1708: error = sysctl_int(oldp, oldlenp, newp, newlen,
1709: &ip_mtudisc_timeout);
1710: if (ip_mtudisc_timeout_q != NULL)
1711: rt_timer_queue_change(ip_mtudisc_timeout_q,
1712: ip_mtudisc_timeout);
1.54 lukem 1713: return (error);
1.65 matt 1714: #ifdef GATEWAY
1715: case IPCTL_MAXFLOWS:
1.67 thorpej 1716: {
1717: int s;
1718:
1.65 matt 1719: error = sysctl_int(oldp, oldlenp, newp, newlen,
1720: &ip_maxflows);
1.67 thorpej 1721: s = splsoftnet();
1.65 matt 1722: ipflow_reap(0);
1.67 thorpej 1723: splx(s);
1.65 matt 1724: return (error);
1.67 thorpej 1725: }
1.89 itojun 1726: #endif
1.90 itojun 1727: case IPCTL_HOSTZEROBROADCAST:
1728: return (sysctl_int(oldp, oldlenp, newp, newlen,
1729: &hostzeroisbroadcast));
1.89 itojun 1730: #if NGIF > 0
1731: case IPCTL_GIF_TTL:
1732: return(sysctl_int(oldp, oldlenp, newp, newlen,
1.90 itojun 1733: &ip_gif_ttl));
1.117 tron 1734: #endif
1735:
1736: #ifndef IPNOPRIVPORTS
1737: case IPCTL_LOWPORTMIN:
1738: old = lowportmin;
1739: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmin);
1740: if (lowportmin >= lowportmax
1741: || lowportmin > IPPORT_RESERVEDMAX
1742: || lowportmin < IPPORT_RESERVEDMIN
1743: ) {
1744: lowportmin = old;
1745: return (EINVAL);
1746: }
1747: return (error);
1748: case IPCTL_LOWPORTMAX:
1749: old = lowportmax;
1750: error = sysctl_int(oldp, oldlenp, newp, newlen, &lowportmax);
1751: if (lowportmin >= lowportmax
1752: || lowportmax > IPPORT_RESERVEDMAX
1753: || lowportmax < IPPORT_RESERVEDMIN
1754: ) {
1755: lowportmax = old;
1756: return (EINVAL);
1757: }
1758: return (error);
1.65 matt 1759: #endif
1.88 sommerfe 1760:
1.13 mycroft 1761: default:
1762: return (EOPNOTSUPP);
1763: }
1764: /* NOTREACHED */
1.1 cgd 1765: }
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