Annotation of src/sys/netinet/ip_input.c, Revision 1.262.6.1
1.262.6.1! mjf 1: /* $NetBSD$ */
1.89 itojun 2:
3: /*
4: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5: * All rights reserved.
1.152 itojun 6: *
1.89 itojun 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.
1.152 itojun 18: *
1.89 itojun 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.
1.172 agc 81: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 82: * may be used to endorse or promote products derived from this software
83: * without specific prior written permission.
84: *
85: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
86: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
87: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
88: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
89: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
90: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
91: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
92: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
93: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
94: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
95: * SUCH DAMAGE.
96: *
1.14 cgd 97: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 98: */
1.141 lukem 99:
100: #include <sys/cdefs.h>
1.262.6.1! mjf 101: __KERNEL_RCSID(0, "$NetBSD$");
1.55 scottr 102:
1.184 jonathan 103: #include "opt_inet.h"
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"
1.167 martin 108: #include "opt_mbuftrace.h"
1.135 thorpej 109: #include "opt_inet_csum.h"
1.1 cgd 110:
1.5 mycroft 111: #include <sys/param.h>
112: #include <sys/systm.h>
113: #include <sys/malloc.h>
114: #include <sys/mbuf.h>
115: #include <sys/domain.h>
116: #include <sys/protosw.h>
117: #include <sys/socket.h>
1.44 thorpej 118: #include <sys/socketvar.h>
1.5 mycroft 119: #include <sys/errno.h>
120: #include <sys/time.h>
121: #include <sys/kernel.h>
1.72 thorpej 122: #include <sys/pool.h>
1.28 christos 123: #include <sys/sysctl.h>
1.230 elad 124: #include <sys/kauth.h>
1.1 cgd 125:
1.5 mycroft 126: #include <net/if.h>
1.44 thorpej 127: #include <net/if_dl.h>
1.5 mycroft 128: #include <net/route.h>
1.45 mrg 129: #include <net/pfil.h>
1.1 cgd 130:
1.5 mycroft 131: #include <netinet/in.h>
132: #include <netinet/in_systm.h>
133: #include <netinet/ip.h>
134: #include <netinet/in_pcb.h>
1.215 yamt 135: #include <netinet/in_proto.h>
1.5 mycroft 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"
1.144 martin 142: #include <net/if_gre.h>
143: #include "gre.h"
1.111 jdolecek 144:
145: #ifdef MROUTING
146: #include <netinet/ip_mroute.h>
147: #endif
1.89 itojun 148:
149: #ifdef IPSEC
150: #include <netinet6/ipsec.h>
151: #include <netkey/key.h>
152: #endif
1.173 jonathan 153: #ifdef FAST_IPSEC
154: #include <netipsec/ipsec.h>
155: #include <netipsec/key.h>
156: #endif /* FAST_IPSEC*/
1.44 thorpej 157:
1.1 cgd 158: #ifndef IPFORWARDING
159: #ifdef GATEWAY
160: #define IPFORWARDING 1 /* forward IP packets not for us */
161: #else /* GATEWAY */
162: #define IPFORWARDING 0 /* don't forward IP packets not for us */
163: #endif /* GATEWAY */
164: #endif /* IPFORWARDING */
165: #ifndef IPSENDREDIRECTS
166: #define IPSENDREDIRECTS 1
167: #endif
1.26 thorpej 168: #ifndef IPFORWSRCRT
1.47 cjs 169: #define IPFORWSRCRT 1 /* forward source-routed packets */
170: #endif
171: #ifndef IPALLOWSRCRT
1.48 mrg 172: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 173: #endif
1.53 kml 174: #ifndef IPMTUDISC
1.153 itojun 175: #define IPMTUDISC 1
1.53 kml 176: #endif
1.60 kml 177: #ifndef IPMTUDISCTIMEOUT
1.61 kml 178: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 179: #endif
1.53 kml 180:
1.27 thorpej 181: /*
182: * Note: DIRECTED_BROADCAST is handled this way so that previous
183: * configuration using this option will Just Work.
184: */
185: #ifndef IPDIRECTEDBCAST
186: #ifdef DIRECTED_BROADCAST
187: #define IPDIRECTEDBCAST 1
188: #else
189: #define IPDIRECTEDBCAST 0
190: #endif /* DIRECTED_BROADCAST */
191: #endif /* IPDIRECTEDBCAST */
1.1 cgd 192: int ipforwarding = IPFORWARDING;
193: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 194: int ip_defttl = IPDEFTTL;
1.26 thorpej 195: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 196: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 197: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 198: int ip_mtudisc = IPMTUDISC;
1.156 itojun 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 200: #ifdef DIAGNOSTIC
201: int ipprintfs = 0;
202: #endif
1.184 jonathan 203:
204: int ip_do_randomid = 0;
205:
1.165 christos 206: /*
207: * XXX - Setting ip_checkinterface mostly implements the receive side of
208: * the Strong ES model described in RFC 1122, but since the routing table
209: * and transmit implementation do not implement the Strong ES model,
210: * setting this to 1 results in an odd hybrid.
211: *
212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
213: * to translate the destination address to another local interface.
214: *
215: * XXX - ip_checkinterface must be disabled if you add IP aliases
216: * to the loopback interface instead of the interface where the
217: * packets for those addresses are received.
218: */
219: int ip_checkinterface = 0;
220:
1.1 cgd 221:
1.60 kml 222: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
223:
1.1 cgd 224: int ipqmaxlen = IFQ_MAXLEN;
1.150 matt 225: u_long in_ifaddrhash; /* size of hash table - 1 */
226: int in_ifaddrentries; /* total number of addrs */
1.212 perry 227: struct in_ifaddrhead in_ifaddrhead;
1.57 tls 228: struct in_ifaddrhashhead *in_ifaddrhashtbl;
1.166 matt 229: u_long in_multihash; /* size of hash table - 1 */
230: int in_multientries; /* total number of addrs */
231: struct in_multihashhead *in_multihashtbl;
1.13 mycroft 232: struct ifqueue ipintrq;
1.63 matt 233: struct ipstat ipstat;
1.183 jonathan 234: uint16_t ip_id;
1.75 thorpej 235:
1.121 thorpej 236: #ifdef PFIL_HOOKS
237: struct pfil_head inet_pfil_hook;
238: #endif
239:
1.194 jonathan 240: /*
241: * Cached copy of nmbclusters. If nbclusters is different,
242: * recalculate IP parameters derived from nmbclusters.
243: */
244: static int ip_nmbclusters; /* copy of nmbclusters */
1.210 perry 245: static void ip_nmbclusters_changed(void); /* recalc limits */
1.194 jonathan 246:
1.195 thorpej 247: #define CHECK_NMBCLUSTER_PARAMS() \
248: do { \
249: if (__predict_false(ip_nmbclusters != nmbclusters)) \
250: ip_nmbclusters_changed(); \
251: } while (/*CONSTCOND*/0)
1.194 jonathan 252:
1.190 jonathan 253: /* IP datagram reassembly queues (hashed) */
254: #define IPREASS_NHASH_LOG2 6
255: #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
256: #define IPREASS_HMASK (IPREASS_NHASH - 1)
257: #define IPREASS_HASH(x,y) \
258: (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
259: struct ipqhead ipq[IPREASS_NHASH];
1.75 thorpej 260: int ipq_locked;
1.212 perry 261: static int ip_nfragpackets; /* packets in reass queue */
1.194 jonathan 262: static int ip_nfrags; /* total fragments in reass queues */
263:
264: int ip_maxfragpackets = 200; /* limit on packets. XXX sysctl */
265: int ip_maxfrags; /* limit on fragments. XXX sysctl */
266:
267:
268: /*
269: * Additive-Increase/Multiplicative-Decrease (AIMD) strategy for
270: * IP reassembly queue buffer managment.
1.212 perry 271: *
1.194 jonathan 272: * We keep a count of total IP fragments (NB: not fragmented packets!)
273: * awaiting reassembly (ip_nfrags) and a limit (ip_maxfrags) on fragments.
274: * If ip_nfrags exceeds ip_maxfrags the limit, we drop half the
275: * total fragments in reassembly queues.This AIMD policy avoids
276: * repeatedly deleting single packets under heavy fragmentation load
277: * (e.g., from lossy NFS peers).
278: */
1.212 perry 279: static u_int ip_reass_ttl_decr(u_int ticks);
1.210 perry 280: static void ip_reass_drophalf(void);
1.194 jonathan 281:
1.75 thorpej 282:
1.223 perry 283: static inline int ipq_lock_try(void);
284: static inline void ipq_unlock(void);
1.75 thorpej 285:
1.223 perry 286: static inline int
1.211 perry 287: ipq_lock_try(void)
1.75 thorpej 288: {
289: int s;
290:
1.132 thorpej 291: /*
1.149 wiz 292: * Use splvm() -- we're blocking things that would cause
1.132 thorpej 293: * mbuf allocation.
294: */
295: s = splvm();
1.75 thorpej 296: if (ipq_locked) {
297: splx(s);
298: return (0);
299: }
300: ipq_locked = 1;
301: splx(s);
302: return (1);
303: }
304:
1.223 perry 305: static inline void
1.211 perry 306: ipq_unlock(void)
1.75 thorpej 307: {
308: int s;
309:
1.132 thorpej 310: s = splvm();
1.75 thorpej 311: ipq_locked = 0;
312: splx(s);
313: }
314:
315: #ifdef DIAGNOSTIC
316: #define IPQ_LOCK() \
317: do { \
318: if (ipq_lock_try() == 0) { \
319: printf("%s:%d: ipq already locked\n", __FILE__, __LINE__); \
320: panic("ipq_lock"); \
321: } \
1.159 perry 322: } while (/*CONSTCOND*/ 0)
1.75 thorpej 323: #define IPQ_LOCK_CHECK() \
324: do { \
325: if (ipq_locked == 0) { \
326: printf("%s:%d: ipq lock not held\n", __FILE__, __LINE__); \
327: panic("ipq lock check"); \
328: } \
1.159 perry 329: } while (/*CONSTCOND*/ 0)
1.75 thorpej 330: #else
331: #define IPQ_LOCK() (void) ipq_lock_try()
332: #define IPQ_LOCK_CHECK() /* nothing */
333: #endif
334:
335: #define IPQ_UNLOCK() ipq_unlock()
1.1 cgd 336:
1.246 ad 337: POOL_INIT(inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl", NULL,
338: IPL_SOFTNET);
339: POOL_INIT(ipqent_pool, sizeof(struct ipqent), 0, 0, 0, "ipqepl", NULL,
340: IPL_VM);
1.72 thorpej 341:
1.135 thorpej 342: #ifdef INET_CSUM_COUNTERS
343: #include <sys/device.h>
344:
345: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
346: NULL, "inet", "hwcsum bad");
347: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
348: NULL, "inet", "hwcsum ok");
349: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
350: NULL, "inet", "swcsum");
351:
352: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
353:
1.201 matt 354: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
355: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
356: EVCNT_ATTACH_STATIC(ip_swcsum);
357:
1.135 thorpej 358: #else
359:
360: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
361:
362: #endif /* INET_CSUM_COUNTERS */
363:
1.1 cgd 364: /*
365: * We need to save the IP options in case a protocol wants to respond
366: * to an incoming packet over the same route if the packet got here
367: * using IP source routing. This allows connection establishment and
368: * maintenance when the remote end is on a network that is not known
369: * to us.
370: */
371: int ip_nhops = 0;
372: static struct ip_srcrt {
373: struct in_addr dst; /* final destination */
374: char nop; /* one NOP to align */
375: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
376: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
377: } ip_srcrt;
378:
1.210 perry 379: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 380:
1.164 matt 381: #ifdef MBUFTRACE
1.234 dogcow 382: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
383: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 384: #endif
385:
1.1 cgd 386: /*
1.194 jonathan 387: * Compute IP limits derived from the value of nmbclusters.
388: */
389: static void
390: ip_nmbclusters_changed(void)
391: {
392: ip_maxfrags = nmbclusters / 4;
393: ip_nmbclusters = nmbclusters;
394: }
395:
396: /*
1.1 cgd 397: * IP initialization: fill in IP protocol switch table.
398: * All protocols not implemented in kernel go to raw IP protocol handler.
399: */
1.8 mycroft 400: void
1.211 perry 401: ip_init(void)
1.1 cgd 402: {
1.199 matt 403: const struct protosw *pr;
1.109 augustss 404: int i;
1.1 cgd 405:
406: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
407: if (pr == 0)
408: panic("ip_init");
409: for (i = 0; i < IPPROTO_MAX; i++)
410: ip_protox[i] = pr - inetsw;
411: for (pr = inetdomain.dom_protosw;
412: pr < inetdomain.dom_protoswNPROTOSW; pr++)
413: if (pr->pr_domain->dom_family == PF_INET &&
414: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
415: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 416:
1.190 jonathan 417: for (i = 0; i < IPREASS_NHASH; i++)
418: LIST_INIT(&ipq[i]);
419:
1.262 matt 420: ip_initid();
1.227 kardel 421: ip_id = time_second & 0xfffff;
1.194 jonathan 422:
1.1 cgd 423: ipintrq.ifq_maxlen = ipqmaxlen;
1.194 jonathan 424: ip_nmbclusters_changed();
425:
1.181 jonathan 426: TAILQ_INIT(&in_ifaddrhead);
1.120 ad 427: in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IFADDR,
428: M_WAITOK, &in_ifaddrhash);
1.166 matt 429: in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, M_IPMADDR,
430: M_WAITOK, &in_multihash);
1.160 itojun 431: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 432: #ifdef GATEWAY
1.248 liamjfoy 433: ipflow_init(ip_hashsize);
1.73 thorpej 434: #endif
1.121 thorpej 435:
436: #ifdef PFIL_HOOKS
437: /* Register our Packet Filter hook. */
1.126 thorpej 438: inet_pfil_hook.ph_type = PFIL_TYPE_AF;
439: inet_pfil_hook.ph_af = AF_INET;
1.121 thorpej 440: i = pfil_head_register(&inet_pfil_hook);
441: if (i != 0)
442: printf("ip_init: WARNING: unable to register pfil hook, "
443: "error %d\n", i);
444: #endif /* PFIL_HOOKS */
1.135 thorpej 445:
1.164 matt 446: #ifdef MBUFTRACE
447: MOWNER_ATTACH(&ip_tx_mowner);
448: MOWNER_ATTACH(&ip_rx_mowner);
449: #endif /* MBUFTRACE */
1.1 cgd 450: }
451:
1.229 christos 452: struct sockaddr_in ipaddr = {
453: .sin_len = sizeof(ipaddr),
454: .sin_family = AF_INET,
455: };
1.1 cgd 456: struct route ipforward_rt;
457:
458: /*
1.89 itojun 459: * IP software interrupt routine
460: */
461: void
1.211 perry 462: ipintr(void)
1.89 itojun 463: {
464: int s;
465: struct mbuf *m;
466:
1.241 ad 467: while (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 468: s = splnet();
1.89 itojun 469: IF_DEQUEUE(&ipintrq, m);
470: splx(s);
471: if (m == 0)
472: return;
473: ip_input(m);
474: }
475: }
476:
477: /*
1.1 cgd 478: * Ip input routine. Checksum and byte swap header. If fragmented
479: * try to reassemble. Process options. Pass to next level.
480: */
1.8 mycroft 481: void
1.89 itojun 482: ip_input(struct mbuf *m)
1.1 cgd 483: {
1.109 augustss 484: struct ip *ip = NULL;
485: struct ipq *fp;
486: struct in_ifaddr *ia;
487: struct ifaddr *ifa;
1.25 cgd 488: struct ipqent *ipqe;
1.89 itojun 489: int hlen = 0, mff, len;
1.100 itojun 490: int downmatch;
1.165 christos 491: int checkif;
1.169 itojun 492: int srcrt = 0;
1.233 tls 493: int s;
1.190 jonathan 494: u_int hash;
1.173 jonathan 495: #ifdef FAST_IPSEC
496: struct m_tag *mtag;
497: struct tdb_ident *tdbi;
498: struct secpolicy *sp;
1.233 tls 499: int error;
1.173 jonathan 500: #endif /* FAST_IPSEC */
1.1 cgd 501:
1.164 matt 502: MCLAIM(m, &ip_rx_mowner);
1.1 cgd 503: #ifdef DIAGNOSTIC
504: if ((m->m_flags & M_PKTHDR) == 0)
505: panic("ipintr no HDR");
1.89 itojun 506: #endif
1.164 matt 507:
1.1 cgd 508: /*
509: * If no IP addresses have been set yet but the interfaces
510: * are receiving, can't do anything with incoming packets yet.
511: */
1.181 jonathan 512: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 513: goto bad;
514: ipstat.ips_total++;
1.154 thorpej 515: /*
516: * If the IP header is not aligned, slurp it up into a new
517: * mbuf with space for link headers, in the event we forward
518: * it. Otherwise, if it is aligned, make sure the entire
519: * base IP header is in the first mbuf of the chain.
520: */
1.244 christos 521: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 522: if ((m = m_copyup(m, sizeof(struct ip),
523: (max_linkhdr + 3) & ~3)) == NULL) {
524: /* XXXJRT new stat, please */
525: ipstat.ips_toosmall++;
526: return;
527: }
528: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
529: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
530: ipstat.ips_toosmall++;
531: return;
532: }
1.1 cgd 533: }
534: ip = mtod(m, struct ip *);
1.13 mycroft 535: if (ip->ip_v != IPVERSION) {
536: ipstat.ips_badvers++;
537: goto bad;
538: }
1.1 cgd 539: hlen = ip->ip_hl << 2;
540: if (hlen < sizeof(struct ip)) { /* minimum header length */
541: ipstat.ips_badhlen++;
542: goto bad;
543: }
544: if (hlen > m->m_len) {
545: if ((m = m_pullup(m, hlen)) == 0) {
546: ipstat.ips_badhlen++;
1.89 itojun 547: return;
1.1 cgd 548: }
549: ip = mtod(m, struct ip *);
550: }
1.98 thorpej 551:
1.85 hwr 552: /*
1.99 thorpej 553: * RFC1122: packets with a multicast source address are
1.98 thorpej 554: * not allowed.
1.85 hwr 555: */
556: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.130 itojun 557: ipstat.ips_badaddr++;
1.85 hwr 558: goto bad;
1.129 itojun 559: }
560:
561: /* 127/8 must not appear on wire - RFC1122 */
562: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
563: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 564: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
565: ipstat.ips_badaddr++;
1.129 itojun 566: goto bad;
1.130 itojun 567: }
1.85 hwr 568: }
569:
1.135 thorpej 570: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 571: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 572: M_CSUM_IPv4_BAD)) {
573: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
574: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
575: goto badcsum;
576:
577: case M_CSUM_IPv4:
578: /* Checksum was okay. */
579: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
580: break;
581:
582: default:
1.206 thorpej 583: /*
584: * Must compute it ourselves. Maybe skip checksum on
585: * loopback interfaces.
586: */
587: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
588: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
589: INET_CSUM_COUNTER_INCR(&ip_swcsum);
590: if (in_cksum(m, hlen) != 0)
591: goto badcsum;
592: }
1.135 thorpej 593: break;
1.1 cgd 594: }
595:
1.121 thorpej 596: /* Retrieve the packet length. */
597: len = ntohs(ip->ip_len);
1.81 proff 598:
599: /*
600: * Check for additional length bogosity
601: */
1.84 proff 602: if (len < hlen) {
1.81 proff 603: ipstat.ips_badlen++;
604: goto bad;
605: }
1.1 cgd 606:
607: /*
608: * Check that the amount of data in the buffers
609: * is as at least much as the IP header would have us expect.
610: * Trim mbufs if longer than we expect.
611: * Drop packet if shorter than we expect.
612: */
1.35 mycroft 613: if (m->m_pkthdr.len < len) {
1.1 cgd 614: ipstat.ips_tooshort++;
615: goto bad;
616: }
1.35 mycroft 617: if (m->m_pkthdr.len > len) {
1.1 cgd 618: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 619: m->m_len = len;
620: m->m_pkthdr.len = len;
1.1 cgd 621: } else
1.35 mycroft 622: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 623: }
624:
1.193 scw 625: #if defined(IPSEC)
1.149 wiz 626: /* ipflow (IP fast forwarding) is not compatible with IPsec. */
1.94 itojun 627: m->m_flags &= ~M_CANFASTFWD;
628: #else
1.64 thorpej 629: /*
630: * Assume that we can create a fast-forward IP flow entry
631: * based on this packet.
632: */
633: m->m_flags |= M_CANFASTFWD;
1.94 itojun 634: #endif
1.64 thorpej 635:
1.36 mrg 636: #ifdef PFIL_HOOKS
1.33 mrg 637: /*
1.64 thorpej 638: * Run through list of hooks for input packets. If there are any
639: * filters which require that additional packets in the flow are
640: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
641: * Note that filters must _never_ set this flag, as another filter
642: * in the list may have previously cleared it.
1.33 mrg 643: */
1.127 itojun 644: /*
645: * let ipfilter look at packet on the wire,
646: * not the decapsulated packet.
647: */
648: #ifdef IPSEC
1.136 itojun 649: if (!ipsec_getnhist(m))
1.186 scw 650: #elif defined(FAST_IPSEC)
651: if (!ipsec_indone(m))
1.127 itojun 652: #else
653: if (1)
654: #endif
655: {
1.169 itojun 656: struct in_addr odst;
657:
658: odst = ip->ip_dst;
1.127 itojun 659: if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 660: PFIL_IN) != 0)
661: return;
1.127 itojun 662: if (m == NULL)
663: return;
664: ip = mtod(m, struct ip *);
1.142 darrenr 665: hlen = ip->ip_hl << 2;
1.205 darrenr 666: /*
667: * XXX The setting of "srcrt" here is to prevent ip_forward()
668: * from generating ICMP redirects for packets that have
669: * been redirected by a hook back out on to the same LAN that
670: * they came from and is not an indication that the packet
671: * is being inffluenced by source routing options. This
672: * allows things like
673: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
674: * where tlp0 is both on the 1.1.1.0/24 network and is the
675: * default route for hosts on 1.1.1.0/24. Of course this
676: * also requires a "map tlp0 ..." to complete the story.
677: * One might argue whether or not this kind of network config.
1.212 perry 678: * should be supported in this manner...
1.205 darrenr 679: */
1.169 itojun 680: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 681: }
1.36 mrg 682: #endif /* PFIL_HOOKS */
1.123 thorpej 683:
684: #ifdef ALTQ
685: /* XXX Temporary until ALTQ is changed to use a pfil hook */
686: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
687: /* packet dropped by traffic conditioner */
688: return;
689: }
690: #endif
1.121 thorpej 691:
692: /*
1.1 cgd 693: * Process options and, if not destined for us,
694: * ship it on. ip_dooptions returns 1 when an
695: * error was detected (causing an icmp message
696: * to be sent and the original packet to be freed).
697: */
698: ip_nhops = 0; /* for source routed packets */
699: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 700: return;
1.1 cgd 701:
702: /*
1.165 christos 703: * Enable a consistency check between the destination address
704: * and the arrival interface for a unicast packet (the RFC 1122
705: * strong ES model) if IP forwarding is disabled and the packet
706: * is not locally generated.
707: *
708: * XXX - Checking also should be disabled if the destination
709: * address is ipnat'ed to a different interface.
710: *
711: * XXX - Checking is incompatible with IP aliases added
712: * to the loopback interface instead of the interface where
713: * the packets are received.
714: *
715: * XXX - We need to add a per ifaddr flag for this so that
716: * we get finer grain control.
717: */
718: checkif = ip_checkinterface && (ipforwarding == 0) &&
719: (m->m_pkthdr.rcvif != NULL) &&
720: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
721:
722: /*
1.1 cgd 723: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 724: *
725: * Traditional 4.4BSD did not consult IFF_UP at all.
726: * The behavior here is to treat addresses on !IFF_UP interface
727: * as not mine.
1.1 cgd 728: */
1.100 itojun 729: downmatch = 0;
1.140 matt 730: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 731: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 732: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
733: continue;
1.97 itojun 734: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
735: break;
1.100 itojun 736: else
737: downmatch++;
1.97 itojun 738: }
739: }
1.86 thorpej 740: if (ia != NULL)
741: goto ours;
1.225 christos 742: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 743: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 744: if (ifa->ifa_addr->sa_family != AF_INET)
745: continue;
1.57 tls 746: ia = ifatoia(ifa);
1.35 mycroft 747: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
748: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 749: /*
750: * Look for all-0's host part (old broadcast addr),
751: * either for subnet or net.
752: */
753: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 754: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 755: goto ours;
1.57 tls 756: /*
757: * An interface with IP address zero accepts
758: * all packets that arrive on that interface.
759: */
760: if (in_nullhost(ia->ia_addr.sin_addr))
761: goto ours;
1.1 cgd 762: }
763: }
1.18 mycroft 764: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 765: struct in_multi *inm;
766: #ifdef MROUTING
767: extern struct socket *ip_mrouter;
1.10 brezak 768:
1.4 hpeyerl 769: if (ip_mrouter) {
770: /*
771: * If we are acting as a multicast router, all
772: * incoming multicast packets are passed to the
773: * kernel-level multicast forwarding function.
774: * The packet is returned (relatively) intact; if
775: * ip_mforward() returns a non-zero value, the packet
776: * must be discarded, else it may be accepted below.
777: *
778: * (The IP ident field is put in the same byte order
779: * as expected when ip_mforward() is called from
780: * ip_output().)
781: */
1.13 mycroft 782: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
783: ipstat.ips_cantforward++;
1.4 hpeyerl 784: m_freem(m);
1.89 itojun 785: return;
1.4 hpeyerl 786: }
787:
788: /*
789: * The process-level routing demon needs to receive
790: * all multicast IGMP packets, whether or not this
791: * host belongs to their destination groups.
792: */
793: if (ip->ip_p == IPPROTO_IGMP)
794: goto ours;
1.13 mycroft 795: ipstat.ips_forward++;
1.4 hpeyerl 796: }
797: #endif
798: /*
799: * See if we belong to the destination multicast group on the
800: * arrival interface.
801: */
802: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
803: if (inm == NULL) {
1.13 mycroft 804: ipstat.ips_cantforward++;
1.4 hpeyerl 805: m_freem(m);
1.89 itojun 806: return;
1.4 hpeyerl 807: }
808: goto ours;
809: }
1.19 mycroft 810: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 811: in_nullhost(ip->ip_dst))
1.1 cgd 812: goto ours;
813:
814: /*
815: * Not for us; forward if possible and desirable.
816: */
817: if (ipforwarding == 0) {
818: ipstat.ips_cantforward++;
819: m_freem(m);
1.100 itojun 820: } else {
821: /*
822: * If ip_dst matched any of my address on !IFF_UP interface,
823: * and there's no IFF_UP interface that matches ip_dst,
824: * send icmp unreach. Forwarding it will result in in-kernel
825: * forwarding loop till TTL goes to 0.
826: */
827: if (downmatch) {
828: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
829: ipstat.ips_cantforward++;
830: return;
831: }
1.145 itojun 832: #ifdef IPSEC
833: if (ipsec4_in_reject(m, NULL)) {
834: ipsecstat.in_polvio++;
835: goto bad;
836: }
837: #endif
1.173 jonathan 838: #ifdef FAST_IPSEC
839: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
840: s = splsoftnet();
841: if (mtag != NULL) {
842: tdbi = (struct tdb_ident *)(mtag + 1);
843: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
844: } else {
845: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 846: IP_FORWARDING, &error);
1.173 jonathan 847: }
848: if (sp == NULL) { /* NB: can happen if error */
849: splx(s);
850: /*XXX error stat???*/
851: DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
852: goto bad;
853: }
854:
855: /*
856: * Check security policy against packet attributes.
857: */
858: error = ipsec_in_reject(sp, m);
859: KEY_FREESP(&sp);
860: splx(s);
861: if (error) {
862: ipstat.ips_cantforward++;
863: goto bad;
1.193 scw 864: }
865:
866: /*
867: * Peek at the outbound SP for this packet to determine if
868: * it's a Fast Forward candidate.
869: */
870: mtag = m_tag_find(m, PACKET_TAG_IPSEC_PENDING_TDB, NULL);
871: if (mtag != NULL)
872: m->m_flags &= ~M_CANFASTFWD;
873: else {
874: s = splsoftnet();
875: sp = ipsec4_checkpolicy(m, IPSEC_DIR_OUTBOUND,
876: (IP_FORWARDING |
877: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
878: &error, NULL);
879: if (sp != NULL) {
880: m->m_flags &= ~M_CANFASTFWD;
881: KEY_FREESP(&sp);
882: }
883: splx(s);
1.173 jonathan 884: }
885: #endif /* FAST_IPSEC */
1.145 itojun 886:
1.169 itojun 887: ip_forward(m, srcrt);
1.100 itojun 888: }
1.89 itojun 889: return;
1.1 cgd 890:
891: ours:
892: /*
893: * If offset or IP_MF are set, must reassemble.
894: * Otherwise, nothing need be done.
895: * (We could look in the reassembly queue to see
896: * if the packet was previously fragmented,
897: * but it's not worth the time; just let them time out.)
898: */
1.155 itojun 899: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.258 matt 900: uint16_t off;
901: /*
902: * Prevent TCP blind data attacks by not allowing non-initial
903: * fragments to start at less than 68 bytes (minimal fragment
1.259 matt 904: * size) and making sure the first fragment is at least 68
905: * bytes.
1.258 matt 906: */
1.260 matt 907: off = (ntohs(ip->ip_off) & IP_OFFMASK) << 3;
1.259 matt 908: if ((off > 0 ? off + hlen : len) < IP_MINFRAGSIZE - 1) {
1.258 matt 909: ipstat.ips_badfrags++;
910: goto bad;
911: }
1.1 cgd 912: /*
913: * Look for queue of fragments
914: * of this datagram.
915: */
1.75 thorpej 916: IPQ_LOCK();
1.190 jonathan 917: hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1.250 dyoung 918: LIST_FOREACH(fp, &ipq[hash], ipq_q) {
1.1 cgd 919: if (ip->ip_id == fp->ipq_id &&
1.35 mycroft 920: in_hosteq(ip->ip_src, fp->ipq_src) &&
921: in_hosteq(ip->ip_dst, fp->ipq_dst) &&
1.260 matt 922: ip->ip_p == fp->ipq_p) {
923: /*
924: * Make sure the TOS is matches previous
925: * fragments.
926: */
927: if (ip->ip_tos != fp->ipq_tos) {
928: ipstat.ips_badfrags++;
929: goto bad;
930: }
1.1 cgd 931: goto found;
1.260 matt 932: }
1.190 jonathan 933: }
1.1 cgd 934: fp = 0;
935: found:
936:
937: /*
938: * Adjust ip_len to not reflect header,
1.25 cgd 939: * set ipqe_mff if more fragments are expected,
1.1 cgd 940: * convert offset of this to bytes.
941: */
1.155 itojun 942: ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
943: mff = (ip->ip_off & htons(IP_MF)) != 0;
1.25 cgd 944: if (mff) {
1.16 cgd 945: /*
946: * Make sure that fragments have a data length
947: * that's a non-zero multiple of 8 bytes.
948: */
1.155 itojun 949: if (ntohs(ip->ip_len) == 0 ||
950: (ntohs(ip->ip_len) & 0x7) != 0) {
1.16 cgd 951: ipstat.ips_badfrags++;
1.75 thorpej 952: IPQ_UNLOCK();
1.16 cgd 953: goto bad;
954: }
955: }
1.155 itojun 956: ip->ip_off = htons((ntohs(ip->ip_off) & IP_OFFMASK) << 3);
1.1 cgd 957:
958: /*
959: * If datagram marked as having more fragments
960: * or if this is not the first fragment,
961: * attempt reassembly; if it succeeds, proceed.
962: */
1.155 itojun 963: if (mff || ip->ip_off != htons(0)) {
1.1 cgd 964: ipstat.ips_fragments++;
1.233 tls 965: s = splvm();
1.72 thorpej 966: ipqe = pool_get(&ipqent_pool, PR_NOWAIT);
1.233 tls 967: splx(s);
1.25 cgd 968: if (ipqe == NULL) {
969: ipstat.ips_rcvmemdrop++;
1.75 thorpej 970: IPQ_UNLOCK();
1.25 cgd 971: goto bad;
972: }
973: ipqe->ipqe_mff = mff;
1.50 thorpej 974: ipqe->ipqe_m = m;
1.25 cgd 975: ipqe->ipqe_ip = ip;
1.190 jonathan 976: m = ip_reass(ipqe, fp, &ipq[hash]);
1.75 thorpej 977: if (m == 0) {
978: IPQ_UNLOCK();
1.89 itojun 979: return;
1.75 thorpej 980: }
1.13 mycroft 981: ipstat.ips_reassembled++;
1.50 thorpej 982: ip = mtod(m, struct ip *);
1.74 thorpej 983: hlen = ip->ip_hl << 2;
1.155 itojun 984: ip->ip_len = htons(ntohs(ip->ip_len) + hlen);
1.1 cgd 985: } else
986: if (fp)
987: ip_freef(fp);
1.75 thorpej 988: IPQ_UNLOCK();
1.79 mycroft 989: }
1.128 itojun 990:
1.173 jonathan 991: #if defined(IPSEC)
1.128 itojun 992: /*
993: * enforce IPsec policy checking if we are seeing last header.
994: * note that we do not visit this with protocols with pcb layer
995: * code - like udp/tcp/raw ip.
996: */
997: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0 &&
998: ipsec4_in_reject(m, NULL)) {
999: ipsecstat.in_polvio++;
1000: goto bad;
1001: }
1002: #endif
1.226 liamjfoy 1003: #ifdef FAST_IPSEC
1.173 jonathan 1004: /*
1005: * enforce IPsec policy checking if we are seeing last header.
1006: * note that we do not visit this with protocols with pcb layer
1007: * code - like udp/tcp/raw ip.
1008: */
1009: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1010: /*
1011: * Check if the packet has already had IPsec processing
1012: * done. If so, then just pass it along. This tag gets
1013: * set during AH, ESP, etc. input handling, before the
1014: * packet is returned to the ip input queue for delivery.
1.212 perry 1015: */
1.173 jonathan 1016: mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1017: s = splsoftnet();
1018: if (mtag != NULL) {
1019: tdbi = (struct tdb_ident *)(mtag + 1);
1020: sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1021: } else {
1022: sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
1.212 perry 1023: IP_FORWARDING, &error);
1.173 jonathan 1024: }
1025: if (sp != NULL) {
1026: /*
1027: * Check security policy against packet attributes.
1028: */
1029: error = ipsec_in_reject(sp, m);
1030: KEY_FREESP(&sp);
1031: } else {
1032: /* XXX error stat??? */
1033: error = EINVAL;
1034: DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1035: }
1036: splx(s);
1037: if (error)
1038: goto bad;
1039: }
1040: #endif /* FAST_IPSEC */
1.1 cgd 1041:
1042: /*
1043: * Switch out to protocol's input routine.
1044: */
1.82 aidan 1045: #if IFA_STATS
1.122 itojun 1046: if (ia && ip)
1.155 itojun 1047: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 1048: #endif
1.1 cgd 1049: ipstat.ips_delivered++;
1.89 itojun 1050: {
1051: int off = hlen, nh = ip->ip_p;
1052:
1053: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1054: return;
1055: }
1.1 cgd 1056: bad:
1057: m_freem(m);
1.135 thorpej 1058: return;
1059:
1060: badcsum:
1061: ipstat.ips_badsum++;
1062: m_freem(m);
1.1 cgd 1063: }
1064:
1065: /*
1066: * Take incoming datagram fragment and try to
1067: * reassemble it into whole datagram. If a chain for
1068: * reassembly of this datagram already exists, then it
1069: * is given as fp; otherwise have to make a chain.
1070: */
1.50 thorpej 1071: struct mbuf *
1.211 perry 1072: ip_reass(struct ipqent *ipqe, struct ipq *fp, struct ipqhead *ipqhead)
1.1 cgd 1073: {
1.109 augustss 1074: struct mbuf *m = ipqe->ipqe_m;
1075: struct ipqent *nq, *p, *q;
1.25 cgd 1076: struct ip *ip;
1.1 cgd 1077: struct mbuf *t;
1.25 cgd 1078: int hlen = ipqe->ipqe_ip->ip_hl << 2;
1.233 tls 1079: int i, next, s;
1.1 cgd 1080:
1.75 thorpej 1081: IPQ_LOCK_CHECK();
1082:
1.1 cgd 1083: /*
1084: * Presence of header sizes in mbufs
1085: * would confuse code below.
1086: */
1087: m->m_data += hlen;
1088: m->m_len -= hlen;
1089:
1.194 jonathan 1090: #ifdef notyet
1091: /* make sure fragment limit is up-to-date */
1092: CHECK_NMBCLUSTER_PARAMS();
1093:
1094: /* If we have too many fragments, drop the older half. */
1095: if (ip_nfrags >= ip_maxfrags)
1096: ip_reass_drophalf(void);
1097: #endif
1098:
1.1 cgd 1099: /*
1.192 jonathan 1100: * We are about to add a fragment; increment frag count.
1101: */
1102: ip_nfrags++;
1.212 perry 1103:
1.192 jonathan 1104: /*
1.1 cgd 1105: * If first fragment to arrive, create a reassembly queue.
1106: */
1107: if (fp == 0) {
1.131 itojun 1108: /*
1109: * Enforce upper bound on number of fragmented packets
1110: * for which we attempt reassembly;
1111: * If maxfrag is 0, never accept fragments.
1112: * If maxfrag is -1, accept all fragments without limitation.
1113: */
1114: if (ip_maxfragpackets < 0)
1115: ;
1116: else if (ip_nfragpackets >= ip_maxfragpackets)
1117: goto dropfrag;
1118: ip_nfragpackets++;
1.50 thorpej 1119: MALLOC(fp, struct ipq *, sizeof (struct ipq),
1120: M_FTABLE, M_NOWAIT);
1121: if (fp == NULL)
1.1 cgd 1122: goto dropfrag;
1.190 jonathan 1123: LIST_INSERT_HEAD(ipqhead, fp, ipq_q);
1.192 jonathan 1124: fp->ipq_nfrags = 1;
1.1 cgd 1125: fp->ipq_ttl = IPFRAGTTL;
1.25 cgd 1126: fp->ipq_p = ipqe->ipqe_ip->ip_p;
1127: fp->ipq_id = ipqe->ipqe_ip->ip_id;
1.260 matt 1128: fp->ipq_tos = ipqe->ipqe_ip->ip_tos;
1.148 matt 1129: TAILQ_INIT(&fp->ipq_fragq);
1.25 cgd 1130: fp->ipq_src = ipqe->ipqe_ip->ip_src;
1131: fp->ipq_dst = ipqe->ipqe_ip->ip_dst;
1132: p = NULL;
1.1 cgd 1133: goto insert;
1.192 jonathan 1134: } else {
1135: fp->ipq_nfrags++;
1.1 cgd 1136: }
1137:
1138: /*
1139: * Find a segment which begins after this one does.
1140: */
1.148 matt 1141: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1142: p = q, q = TAILQ_NEXT(q, ipqe_q))
1.155 itojun 1143: if (ntohs(q->ipqe_ip->ip_off) > ntohs(ipqe->ipqe_ip->ip_off))
1.1 cgd 1144: break;
1145:
1146: /*
1147: * If there is a preceding segment, it may provide some of
1148: * our data already. If so, drop the data from the incoming
1149: * segment. If it provides all of our data, drop us.
1150: */
1.25 cgd 1151: if (p != NULL) {
1.155 itojun 1152: i = ntohs(p->ipqe_ip->ip_off) + ntohs(p->ipqe_ip->ip_len) -
1153: ntohs(ipqe->ipqe_ip->ip_off);
1.1 cgd 1154: if (i > 0) {
1.155 itojun 1155: if (i >= ntohs(ipqe->ipqe_ip->ip_len))
1.1 cgd 1156: goto dropfrag;
1.50 thorpej 1157: m_adj(ipqe->ipqe_m, i);
1.155 itojun 1158: ipqe->ipqe_ip->ip_off =
1159: htons(ntohs(ipqe->ipqe_ip->ip_off) + i);
1160: ipqe->ipqe_ip->ip_len =
1161: htons(ntohs(ipqe->ipqe_ip->ip_len) - i);
1.1 cgd 1162: }
1163: }
1164:
1165: /*
1166: * While we overlap succeeding segments trim them or,
1167: * if they are completely covered, dequeue them.
1168: */
1.155 itojun 1169: for (; q != NULL &&
1170: ntohs(ipqe->ipqe_ip->ip_off) + ntohs(ipqe->ipqe_ip->ip_len) >
1171: ntohs(q->ipqe_ip->ip_off); q = nq) {
1172: i = (ntohs(ipqe->ipqe_ip->ip_off) +
1173: ntohs(ipqe->ipqe_ip->ip_len)) - ntohs(q->ipqe_ip->ip_off);
1174: if (i < ntohs(q->ipqe_ip->ip_len)) {
1175: q->ipqe_ip->ip_len =
1176: htons(ntohs(q->ipqe_ip->ip_len) - i);
1177: q->ipqe_ip->ip_off =
1178: htons(ntohs(q->ipqe_ip->ip_off) + i);
1.50 thorpej 1179: m_adj(q->ipqe_m, i);
1.1 cgd 1180: break;
1181: }
1.148 matt 1182: nq = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1183: m_freem(q->ipqe_m);
1.148 matt 1184: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1185: s = splvm();
1.72 thorpej 1186: pool_put(&ipqent_pool, q);
1.233 tls 1187: splx(s);
1.192 jonathan 1188: fp->ipq_nfrags--;
1189: ip_nfrags--;
1.1 cgd 1190: }
1191:
1192: insert:
1193: /*
1194: * Stick new segment in its place;
1195: * check for complete reassembly.
1196: */
1.25 cgd 1197: if (p == NULL) {
1.148 matt 1198: TAILQ_INSERT_HEAD(&fp->ipq_fragq, ipqe, ipqe_q);
1.25 cgd 1199: } else {
1.148 matt 1200: TAILQ_INSERT_AFTER(&fp->ipq_fragq, p, ipqe, ipqe_q);
1.25 cgd 1201: }
1.1 cgd 1202: next = 0;
1.148 matt 1203: for (p = NULL, q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL;
1204: p = q, q = TAILQ_NEXT(q, ipqe_q)) {
1.155 itojun 1205: if (ntohs(q->ipqe_ip->ip_off) != next)
1.1 cgd 1206: return (0);
1.155 itojun 1207: next += ntohs(q->ipqe_ip->ip_len);
1.1 cgd 1208: }
1.25 cgd 1209: if (p->ipqe_mff)
1.1 cgd 1210: return (0);
1211:
1212: /*
1.41 thorpej 1213: * Reassembly is complete. Check for a bogus message size and
1214: * concatenate fragments.
1.1 cgd 1215: */
1.148 matt 1216: q = TAILQ_FIRST(&fp->ipq_fragq);
1.25 cgd 1217: ip = q->ipqe_ip;
1.41 thorpej 1218: if ((next + (ip->ip_hl << 2)) > IP_MAXPACKET) {
1219: ipstat.ips_toolong++;
1220: ip_freef(fp);
1221: return (0);
1222: }
1.50 thorpej 1223: m = q->ipqe_m;
1.1 cgd 1224: t = m->m_next;
1225: m->m_next = 0;
1226: m_cat(m, t);
1.148 matt 1227: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1228: s = splvm();
1.72 thorpej 1229: pool_put(&ipqent_pool, q);
1.233 tls 1230: splx(s);
1.25 cgd 1231: for (q = nq; q != NULL; q = nq) {
1.50 thorpej 1232: t = q->ipqe_m;
1.148 matt 1233: nq = TAILQ_NEXT(q, ipqe_q);
1.233 tls 1234: s = splvm();
1.72 thorpej 1235: pool_put(&ipqent_pool, q);
1.233 tls 1236: splx(s);
1.1 cgd 1237: m_cat(m, t);
1238: }
1.192 jonathan 1239: ip_nfrags -= fp->ipq_nfrags;
1.1 cgd 1240:
1241: /*
1242: * Create header for new ip packet by
1243: * modifying header of first packet;
1244: * dequeue and discard fragment reassembly header.
1245: * Make header visible.
1246: */
1.155 itojun 1247: ip->ip_len = htons(next);
1.25 cgd 1248: ip->ip_src = fp->ipq_src;
1249: ip->ip_dst = fp->ipq_dst;
1250: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1251: FREE(fp, M_FTABLE);
1.131 itojun 1252: ip_nfragpackets--;
1.1 cgd 1253: m->m_len += (ip->ip_hl << 2);
1254: m->m_data -= (ip->ip_hl << 2);
1255: /* some debugging cruft by sklower, below, will go away soon */
1256: if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
1.109 augustss 1257: int plen = 0;
1.50 thorpej 1258: for (t = m; t; t = t->m_next)
1259: plen += t->m_len;
1260: m->m_pkthdr.len = plen;
1.213 yamt 1261: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1262: }
1.50 thorpej 1263: return (m);
1.1 cgd 1264:
1265: dropfrag:
1.192 jonathan 1266: if (fp != 0)
1267: fp->ipq_nfrags--;
1268: ip_nfrags--;
1.1 cgd 1269: ipstat.ips_fragdropped++;
1270: m_freem(m);
1.233 tls 1271: s = splvm();
1.72 thorpej 1272: pool_put(&ipqent_pool, ipqe);
1.233 tls 1273: splx(s);
1.1 cgd 1274: return (0);
1275: }
1276:
1277: /*
1278: * Free a fragment reassembly header and all
1279: * associated datagrams.
1280: */
1.8 mycroft 1281: void
1.211 perry 1282: ip_freef(struct ipq *fp)
1.1 cgd 1283: {
1.109 augustss 1284: struct ipqent *q, *p;
1.192 jonathan 1285: u_int nfrags = 0;
1.233 tls 1286: int s;
1.1 cgd 1287:
1.75 thorpej 1288: IPQ_LOCK_CHECK();
1289:
1.148 matt 1290: for (q = TAILQ_FIRST(&fp->ipq_fragq); q != NULL; q = p) {
1291: p = TAILQ_NEXT(q, ipqe_q);
1.50 thorpej 1292: m_freem(q->ipqe_m);
1.192 jonathan 1293: nfrags++;
1.148 matt 1294: TAILQ_REMOVE(&fp->ipq_fragq, q, ipqe_q);
1.233 tls 1295: s = splvm();
1.72 thorpej 1296: pool_put(&ipqent_pool, q);
1.233 tls 1297: splx(s);
1.1 cgd 1298: }
1.192 jonathan 1299:
1300: if (nfrags != fp->ipq_nfrags)
1301: printf("ip_freef: nfrags %d != %d\n", fp->ipq_nfrags, nfrags);
1302: ip_nfrags -= nfrags;
1.25 cgd 1303: LIST_REMOVE(fp, ipq_q);
1.50 thorpej 1304: FREE(fp, M_FTABLE);
1.131 itojun 1305: ip_nfragpackets--;
1.1 cgd 1306: }
1307:
1308: /*
1.194 jonathan 1309: * IP reassembly TTL machinery for multiplicative drop.
1310: */
1311: static u_int fragttl_histo[(IPFRAGTTL+1)];
1312:
1313:
1314: /*
1315: * Decrement TTL of all reasembly queue entries by `ticks'.
1316: * Count number of distinct fragments (as opposed to partial, fragmented
1317: * datagrams) in the reassembly queue. While we traverse the entire
1318: * reassembly queue, compute and return the median TTL over all fragments.
1319: */
1320: static u_int
1321: ip_reass_ttl_decr(u_int ticks)
1322: {
1.198 matt 1323: u_int nfrags, median, dropfraction, keepfraction;
1.194 jonathan 1324: struct ipq *fp, *nfp;
1.198 matt 1325: int i;
1.212 perry 1326:
1.194 jonathan 1327: nfrags = 0;
1328: memset(fragttl_histo, 0, sizeof fragttl_histo);
1.212 perry 1329:
1.194 jonathan 1330: for (i = 0; i < IPREASS_NHASH; i++) {
1331: for (fp = LIST_FIRST(&ipq[i]); fp != NULL; fp = nfp) {
1332: fp->ipq_ttl = ((fp->ipq_ttl <= ticks) ?
1333: 0 : fp->ipq_ttl - ticks);
1334: nfp = LIST_NEXT(fp, ipq_q);
1335: if (fp->ipq_ttl == 0) {
1336: ipstat.ips_fragtimeout++;
1337: ip_freef(fp);
1338: } else {
1339: nfrags += fp->ipq_nfrags;
1340: fragttl_histo[fp->ipq_ttl] += fp->ipq_nfrags;
1341: }
1342: }
1343: }
1344:
1345: KASSERT(ip_nfrags == nfrags);
1346:
1347: /* Find median (or other drop fraction) in histogram. */
1348: dropfraction = (ip_nfrags / 2);
1349: keepfraction = ip_nfrags - dropfraction;
1350: for (i = IPFRAGTTL, median = 0; i >= 0; i--) {
1351: median += fragttl_histo[i];
1352: if (median >= keepfraction)
1353: break;
1354: }
1355:
1356: /* Return TTL of median (or other fraction). */
1357: return (u_int)i;
1358: }
1359:
1360: void
1361: ip_reass_drophalf(void)
1362: {
1363:
1364: u_int median_ticks;
1365: /*
1366: * Compute median TTL of all fragments, and count frags
1367: * with that TTL or lower (roughly half of all fragments).
1368: */
1369: median_ticks = ip_reass_ttl_decr(0);
1370:
1371: /* Drop half. */
1372: median_ticks = ip_reass_ttl_decr(median_ticks);
1373:
1374: }
1375:
1376: /*
1.1 cgd 1377: * IP timer processing;
1378: * if a timer expires on a reassembly
1379: * queue, discard it.
1380: */
1.8 mycroft 1381: void
1.211 perry 1382: ip_slowtimo(void)
1.1 cgd 1383: {
1.191 jonathan 1384: static u_int dropscanidx = 0;
1385: u_int i;
1.194 jonathan 1386: u_int median_ttl;
1.24 mycroft 1387: int s = splsoftnet();
1.1 cgd 1388:
1.75 thorpej 1389: IPQ_LOCK();
1.194 jonathan 1390:
1391: /* Age TTL of all fragments by 1 tick .*/
1392: median_ttl = ip_reass_ttl_decr(1);
1393:
1394: /* make sure fragment limit is up-to-date */
1395: CHECK_NMBCLUSTER_PARAMS();
1396:
1397: /* If we have too many fragments, drop the older half. */
1398: if (ip_nfrags > ip_maxfrags)
1399: ip_reass_ttl_decr(median_ttl);
1400:
1.131 itojun 1401: /*
1.194 jonathan 1402: * If we are over the maximum number of fragmented packets
1.131 itojun 1403: * (due to the limit being lowered), drain off
1.190 jonathan 1404: * enough to get down to the new limit. Start draining
1405: * from the reassembly hashqueue most recently drained.
1.131 itojun 1406: */
1407: if (ip_maxfragpackets < 0)
1408: ;
1409: else {
1.190 jonathan 1410: int wrapped = 0;
1411:
1412: i = dropscanidx;
1413: while (ip_nfragpackets > ip_maxfragpackets && wrapped == 0) {
1414: while (LIST_FIRST(&ipq[i]) != NULL)
1415: ip_freef(LIST_FIRST(&ipq[i]));
1416: if (++i >= IPREASS_NHASH) {
1417: i = 0;
1418: }
1419: /*
1420: * Dont scan forever even if fragment counters are
1421: * wrong: stop after scanning entire reassembly queue.
1422: */
1423: if (i == dropscanidx)
1424: wrapped = 1;
1425: }
1426: dropscanidx = i;
1.131 itojun 1427: }
1.75 thorpej 1428: IPQ_UNLOCK();
1.1 cgd 1429: splx(s);
1430: }
1431:
1432: /*
1433: * Drain off all datagram fragments.
1434: */
1.8 mycroft 1435: void
1.211 perry 1436: ip_drain(void)
1.1 cgd 1437: {
1438:
1.75 thorpej 1439: /*
1440: * We may be called from a device's interrupt context. If
1441: * the ipq is already busy, just bail out now.
1442: */
1443: if (ipq_lock_try() == 0)
1444: return;
1445:
1.194 jonathan 1446: /*
1447: * Drop half the total fragments now. If more mbufs are needed,
1448: * we will be called again soon.
1449: */
1450: ip_reass_drophalf();
1.75 thorpej 1451:
1452: IPQ_UNLOCK();
1.1 cgd 1453: }
1454:
1455: /*
1456: * Do option processing on a datagram,
1457: * possibly discarding it if bad options are encountered,
1458: * or forwarding it if source-routed.
1459: * Returns 1 if packet has been forwarded/freed,
1460: * 0 if the packet should be processed further.
1461: */
1.8 mycroft 1462: int
1.211 perry 1463: ip_dooptions(struct mbuf *m)
1.1 cgd 1464: {
1.109 augustss 1465: struct ip *ip = mtod(m, struct ip *);
1466: u_char *cp, *cp0;
1467: struct ip_timestamp *ipt;
1468: struct in_ifaddr *ia;
1.1 cgd 1469: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 1470: struct in_addr dst;
1.1 cgd 1471: n_time ntime;
1472:
1.13 mycroft 1473: dst = ip->ip_dst;
1.1 cgd 1474: cp = (u_char *)(ip + 1);
1475: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
1476: for (; cnt > 0; cnt -= optlen, cp += optlen) {
1477: opt = cp[IPOPT_OPTVAL];
1478: if (opt == IPOPT_EOL)
1479: break;
1480: if (opt == IPOPT_NOP)
1481: optlen = 1;
1482: else {
1.113 itojun 1483: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1484: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1485: goto bad;
1486: }
1.1 cgd 1487: optlen = cp[IPOPT_OLEN];
1.114 itojun 1488: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 1489: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1490: goto bad;
1491: }
1492: }
1493: switch (opt) {
1494:
1495: default:
1496: break;
1497:
1498: /*
1499: * Source routing with record.
1500: * Find interface with current destination address.
1501: * If none on this machine then drop if strictly routed,
1502: * or do nothing if loosely routed.
1503: * Record interface address and bring up next address
1504: * component. If strictly routed make sure next
1505: * address is on directly accessible net.
1506: */
1507: case IPOPT_LSRR:
1508: case IPOPT_SSRR:
1.47 cjs 1509: if (ip_allowsrcrt == 0) {
1510: type = ICMP_UNREACH;
1511: code = ICMP_UNREACH_NET_PROHIB;
1512: goto bad;
1513: }
1.114 itojun 1514: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1515: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1516: goto bad;
1517: }
1.1 cgd 1518: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1519: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1520: goto bad;
1521: }
1522: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 1523: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 1524: if (ia == 0) {
1525: if (opt == IPOPT_SSRR) {
1526: type = ICMP_UNREACH;
1527: code = ICMP_UNREACH_SRCFAIL;
1528: goto bad;
1529: }
1530: /*
1531: * Loose routing, and not at next destination
1532: * yet; nothing to do except forward.
1533: */
1534: break;
1535: }
1536: off--; /* 0 origin */
1.112 sommerfe 1537: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 1538: /*
1539: * End of source route. Should be for us.
1540: */
1541: save_rte(cp, ip->ip_src);
1542: break;
1543: }
1544: /*
1545: * locate outgoing interface
1546: */
1.244 christos 1547: bcopy((void *)(cp + off), (void *)&ipaddr.sin_addr,
1.1 cgd 1548: sizeof(ipaddr.sin_addr));
1.96 thorpej 1549: if (opt == IPOPT_SSRR)
1.196 itojun 1550: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 1551: else
1.1 cgd 1552: ia = ip_rtaddr(ipaddr.sin_addr);
1553: if (ia == 0) {
1554: type = ICMP_UNREACH;
1555: code = ICMP_UNREACH_SRCFAIL;
1556: goto bad;
1557: }
1558: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 1559: bcopy((void *)&ia->ia_addr.sin_addr,
1560: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1561: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 1562: /*
1563: * Let ip_intr's mcast routing check handle mcast pkts
1564: */
1.18 mycroft 1565: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 1566: break;
1567:
1568: case IPOPT_RR:
1.114 itojun 1569: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1570: code = &cp[IPOPT_OLEN] - (u_char *)ip;
1571: goto bad;
1572: }
1.1 cgd 1573: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1574: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1575: goto bad;
1576: }
1577: /*
1578: * If no space remains, ignore.
1579: */
1580: off--; /* 0 origin */
1.112 sommerfe 1581: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 1582: break;
1.244 christos 1583: bcopy((void *)(&ip->ip_dst), (void *)&ipaddr.sin_addr,
1.1 cgd 1584: sizeof(ipaddr.sin_addr));
1585: /*
1586: * locate outgoing interface; if we're the destination,
1587: * use the incoming interface (should be same).
1588: */
1.96 thorpej 1589: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
1590: == NULL &&
1591: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 1592: type = ICMP_UNREACH;
1593: code = ICMP_UNREACH_HOST;
1594: goto bad;
1595: }
1.244 christos 1596: bcopy((void *)&ia->ia_addr.sin_addr,
1597: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 1598: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1599: break;
1600:
1601: case IPOPT_TS:
1602: code = cp - (u_char *)ip;
1603: ipt = (struct ip_timestamp *)cp;
1.114 itojun 1604: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
1605: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 1606: goto bad;
1.114 itojun 1607: }
1608: if (ipt->ipt_ptr < 5) {
1609: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
1610: goto bad;
1611: }
1.15 cgd 1612: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 1613: if (++ipt->ipt_oflw == 0) {
1614: code = (u_char *)&ipt->ipt_ptr -
1615: (u_char *)ip;
1.1 cgd 1616: goto bad;
1.114 itojun 1617: }
1.1 cgd 1618: break;
1619: }
1.104 thorpej 1620: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 1621: switch (ipt->ipt_flg) {
1622:
1623: case IPOPT_TS_TSONLY:
1624: break;
1625:
1626: case IPOPT_TS_TSANDADDR:
1.66 thorpej 1627: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1628: sizeof(struct in_addr) > ipt->ipt_len) {
1629: code = (u_char *)&ipt->ipt_ptr -
1630: (u_char *)ip;
1.1 cgd 1631: goto bad;
1.114 itojun 1632: }
1.13 mycroft 1633: ipaddr.sin_addr = dst;
1.96 thorpej 1634: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1635: m->m_pkthdr.rcvif));
1.13 mycroft 1636: if (ia == 0)
1637: continue;
1.104 thorpej 1638: bcopy(&ia->ia_addr.sin_addr,
1639: cp0, sizeof(struct in_addr));
1.1 cgd 1640: ipt->ipt_ptr += sizeof(struct in_addr);
1641: break;
1642:
1643: case IPOPT_TS_PRESPEC:
1.66 thorpej 1644: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1645: sizeof(struct in_addr) > ipt->ipt_len) {
1646: code = (u_char *)&ipt->ipt_ptr -
1647: (u_char *)ip;
1.1 cgd 1648: goto bad;
1.114 itojun 1649: }
1.104 thorpej 1650: bcopy(cp0, &ipaddr.sin_addr,
1.1 cgd 1651: sizeof(struct in_addr));
1.96 thorpej 1652: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1653: == NULL)
1.1 cgd 1654: continue;
1655: ipt->ipt_ptr += sizeof(struct in_addr);
1656: break;
1657:
1658: default:
1.114 itojun 1659: /* XXX can't take &ipt->ipt_flg */
1660: code = (u_char *)&ipt->ipt_ptr -
1661: (u_char *)ip + 1;
1.1 cgd 1662: goto bad;
1663: }
1664: ntime = iptime();
1.107 thorpej 1665: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1666: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1667: sizeof(n_time));
1668: ipt->ipt_ptr += sizeof(n_time);
1669: }
1670: }
1671: if (forward) {
1.26 thorpej 1672: if (ip_forwsrcrt == 0) {
1673: type = ICMP_UNREACH;
1674: code = ICMP_UNREACH_SRCFAIL;
1675: goto bad;
1676: }
1.1 cgd 1677: ip_forward(m, 1);
1678: return (1);
1.13 mycroft 1679: }
1680: return (0);
1.1 cgd 1681: bad:
1.13 mycroft 1682: icmp_error(m, type, code, 0, 0);
1683: ipstat.ips_badoptions++;
1.1 cgd 1684: return (1);
1685: }
1686:
1687: /*
1688: * Given address of next destination (final or next hop),
1689: * return internet address info of interface to be used to get there.
1690: */
1691: struct in_ifaddr *
1.211 perry 1692: ip_rtaddr(struct in_addr dst)
1.1 cgd 1693: {
1.249 dyoung 1694: struct rtentry *rt;
1695: union {
1696: struct sockaddr dst;
1697: struct sockaddr_in dst4;
1698: } u;
1699:
1700: sockaddr_in_init(&u.dst4, &dst, 0);
1701:
1702: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1703: return NULL;
1704:
1705: return ifatoia(rt->rt_ifa);
1.1 cgd 1706: }
1707:
1708: /*
1709: * Save incoming source route for use in replies,
1710: * to be picked up later by ip_srcroute if the receiver is interested.
1711: */
1.13 mycroft 1712: void
1.211 perry 1713: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1714: {
1715: unsigned olen;
1716:
1717: olen = option[IPOPT_OLEN];
1718: #ifdef DIAGNOSTIC
1719: if (ipprintfs)
1.39 christos 1720: printf("save_rte: olen %d\n", olen);
1.89 itojun 1721: #endif /* 0 */
1.1 cgd 1722: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1723: return;
1.244 christos 1724: bcopy((void *)option, (void *)ip_srcrt.srcopt, olen);
1.1 cgd 1725: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1726: ip_srcrt.dst = dst;
1727: }
1728:
1729: /*
1730: * Retrieve incoming source route for use in replies,
1731: * in the same form used by setsockopt.
1732: * The first hop is placed before the options, will be removed later.
1733: */
1734: struct mbuf *
1.211 perry 1735: ip_srcroute(void)
1.1 cgd 1736: {
1.109 augustss 1737: struct in_addr *p, *q;
1738: struct mbuf *m;
1.1 cgd 1739:
1740: if (ip_nhops == 0)
1.237 dyoung 1741: return NULL;
1.1 cgd 1742: m = m_get(M_DONTWAIT, MT_SOOPTS);
1743: if (m == 0)
1.237 dyoung 1744: return NULL;
1.1 cgd 1745:
1.164 matt 1746: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1747: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1748:
1749: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1750: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1751: OPTSIZ;
1752: #ifdef DIAGNOSTIC
1753: if (ipprintfs)
1.39 christos 1754: printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1.1 cgd 1755: #endif
1756:
1757: /*
1758: * First save first hop for return route
1759: */
1760: p = &ip_srcrt.route[ip_nhops - 1];
1761: *(mtod(m, struct in_addr *)) = *p--;
1762: #ifdef DIAGNOSTIC
1763: if (ipprintfs)
1.39 christos 1764: printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
1.1 cgd 1765: #endif
1766:
1767: /*
1768: * Copy option fields and padding (nop) to mbuf.
1769: */
1770: ip_srcrt.nop = IPOPT_NOP;
1771: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1772: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1773: OPTSIZ);
1774: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1775: sizeof(struct in_addr) + OPTSIZ);
1776: #undef OPTSIZ
1777: /*
1778: * Record return path as an IP source route,
1779: * reversing the path (pointers are now aligned).
1780: */
1781: while (p >= ip_srcrt.route) {
1782: #ifdef DIAGNOSTIC
1783: if (ipprintfs)
1.39 christos 1784: printf(" %x", ntohl(q->s_addr));
1.1 cgd 1785: #endif
1786: *q++ = *p--;
1787: }
1788: /*
1789: * Last hop goes to final destination.
1790: */
1791: *q = ip_srcrt.dst;
1792: #ifdef DIAGNOSTIC
1793: if (ipprintfs)
1.39 christos 1794: printf(" %x\n", ntohl(q->s_addr));
1.1 cgd 1795: #endif
1796: return (m);
1797: }
1798:
1.139 matt 1799: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1800: [PRC_MSGSIZE] = EMSGSIZE,
1801: [PRC_HOSTDEAD] = EHOSTDOWN,
1802: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1803: [PRC_UNREACH_NET] = EHOSTUNREACH,
1804: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1805: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1806: [PRC_UNREACH_PORT] = ECONNREFUSED,
1807: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1808: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1809: };
1810:
1811: /*
1812: * Forward a packet. If some error occurs return the sender
1813: * an icmp packet. Note we can't always generate a meaningful
1814: * icmp message because icmp doesn't have a large enough repertoire
1815: * of codes and types.
1816: *
1817: * If not forwarding, just drop the packet. This could be confusing
1818: * if ipforwarding was zero but some routing protocol was advancing
1819: * us as a gateway to somewhere. However, we must let the routing
1820: * protocol deal with that.
1821: *
1822: * The srcrt parameter indicates whether the packet is being forwarded
1823: * via a source route.
1824: */
1.13 mycroft 1825: void
1.211 perry 1826: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1827: {
1.109 augustss 1828: struct ip *ip = mtod(m, struct ip *);
1829: struct rtentry *rt;
1.220 christos 1830: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1831: struct mbuf *mcopy;
1.13 mycroft 1832: n_long dest;
1.249 dyoung 1833: union {
1834: struct sockaddr dst;
1835: struct sockaddr_in dst4;
1836: } u;
1.164 matt 1837:
1838: /*
1839: * We are now in the output path.
1840: */
1841: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1842:
1843: /*
1844: * Clear any in-bound checksum flags for this packet.
1845: */
1846: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1847:
1.13 mycroft 1848: dest = 0;
1.1 cgd 1849: #ifdef DIAGNOSTIC
1.224 joerg 1850: if (ipprintfs) {
1851: printf("forward: src %s ", inet_ntoa(ip->ip_src));
1852: printf("dst %s ttl %x\n", inet_ntoa(ip->ip_dst), ip->ip_ttl);
1853: }
1.1 cgd 1854: #endif
1.93 sommerfe 1855: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.1 cgd 1856: ipstat.ips_cantforward++;
1857: m_freem(m);
1858: return;
1859: }
1860: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1861: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1862: return;
1863: }
1864:
1.249 dyoung 1865: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1866: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1867: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1868: return;
1.1 cgd 1869: }
1870:
1871: /*
1.34 mycroft 1872: * Save at most 68 bytes of the packet in case
1.1 cgd 1873: * we need to generate an ICMP message to the src.
1.119 itojun 1874: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1875: */
1.155 itojun 1876: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1877: if (mcopy)
1878: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1879:
1.221 christos 1880: ip->ip_ttl -= IPTTLDEC;
1881:
1.1 cgd 1882: /*
1883: * If forwarding packet using same interface that it came in on,
1884: * perhaps should send a redirect to sender to shortcut a hop.
1885: * Only send redirect if source is sending directly to us,
1886: * and if packet was not source routed (or has any options).
1887: * Also, don't send redirect if forwarding using a default route
1888: * or a route modified by a redirect.
1889: */
1890: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1891: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1892: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1893: ipsendredirects && !srcrt) {
1.19 mycroft 1894: if (rt->rt_ifa &&
1895: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1896: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1897: if (rt->rt_flags & RTF_GATEWAY)
1898: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1899: else
1900: dest = ip->ip_dst.s_addr;
1901: /*
1902: * Router requirements says to only send host
1903: * redirects.
1904: */
1905: type = ICMP_REDIRECT;
1906: code = ICMP_REDIRECT_HOST;
1.1 cgd 1907: #ifdef DIAGNOSTIC
1.77 thorpej 1908: if (ipprintfs)
1909: printf("redirect (%d) to %x\n", code,
1910: (u_int32_t)dest);
1.1 cgd 1911: #endif
1912: }
1913: }
1914:
1.238 dyoung 1915: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1916: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.174 itojun 1917: (struct ip_moptions *)NULL, (struct socket *)NULL);
1.173 jonathan 1918:
1.1 cgd 1919: if (error)
1920: ipstat.ips_cantforward++;
1921: else {
1922: ipstat.ips_forward++;
1923: if (type)
1924: ipstat.ips_redirectsent++;
1925: else {
1.63 matt 1926: if (mcopy) {
1927: #ifdef GATEWAY
1.64 thorpej 1928: if (mcopy->m_flags & M_CANFASTFWD)
1929: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1930: #endif
1.1 cgd 1931: m_freem(mcopy);
1.63 matt 1932: }
1.1 cgd 1933: return;
1934: }
1935: }
1936: if (mcopy == NULL)
1937: return;
1.13 mycroft 1938:
1.1 cgd 1939: switch (error) {
1940:
1941: case 0: /* forwarded, but need redirect */
1942: /* type, code set above */
1943: break;
1944:
1945: case ENETUNREACH: /* shouldn't happen, checked above */
1946: case EHOSTUNREACH:
1947: case ENETDOWN:
1948: case EHOSTDOWN:
1949: default:
1950: type = ICMP_UNREACH;
1951: code = ICMP_UNREACH_HOST;
1952: break;
1953:
1954: case EMSGSIZE:
1955: type = ICMP_UNREACH;
1956: code = ICMP_UNREACH_NEEDFRAG;
1.262.6.1! mjf 1957:
1.261 dyoung 1958: if ((rt = rtcache_validate(&ipforward_rt)) != NULL) {
1.262.6.1! mjf 1959:
! 1960: #if defined(IPSEC) || defined(FAST_IPSEC)
! 1961: /*
! 1962: * If the packet is routed over IPsec tunnel, tell the
! 1963: * originator the tunnel MTU.
! 1964: * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
! 1965: * XXX quickhack!!!
! 1966: */
! 1967:
1.89 itojun 1968: struct secpolicy *sp;
1969: int ipsecerror;
1.95 itojun 1970: size_t ipsechdr;
1.89 itojun 1971: struct route *ro;
1972:
1973: sp = ipsec4_getpolicybyaddr(mcopy,
1.170 itojun 1974: IPSEC_DIR_OUTBOUND, IP_FORWARDING,
1975: &ipsecerror);
1.262.6.1! mjf 1976: #endif
1.89 itojun 1977:
1.262.6.1! mjf 1978: destmtu = rt->rt_ifp->if_mtu;
! 1979: #if defined(IPSEC) || defined(FAST_IPSEC)
! 1980: if (sp != NULL) {
1.89 itojun 1981: /* count IPsec header size */
1.95 itojun 1982: ipsechdr = ipsec4_hdrsiz(mcopy,
1.170 itojun 1983: IPSEC_DIR_OUTBOUND, NULL);
1.89 itojun 1984:
1985: /*
1986: * find the correct route for outer IPv4
1987: * header, compute tunnel MTU.
1988: */
1.220 christos 1989:
1.89 itojun 1990: if (sp->req != NULL
1.95 itojun 1991: && sp->req->sav != NULL
1992: && sp->req->sav->sah != NULL) {
1993: ro = &sp->req->sav->sah->sa_route;
1.257 dyoung 1994: if (rt && rt->rt_ifp) {
1.220 christos 1995: destmtu =
1.257 dyoung 1996: rt->rt_rmx.rmx_mtu ?
1997: rt->rt_rmx.rmx_mtu :
1998: rt->rt_ifp->if_mtu;
1.220 christos 1999: destmtu -= ipsechdr;
1.89 itojun 2000: }
2001: }
2002:
1.173 jonathan 2003: #ifdef IPSEC
1.89 itojun 2004: key_freesp(sp);
1.173 jonathan 2005: #else
2006: KEY_FREESP(&sp);
2007: #endif
1.89 itojun 2008: }
1.262.6.1! mjf 2009: #endif /*defined(IPSEC) || defined(FAST_IPSEC)*/
1.89 itojun 2010: }
1.1 cgd 2011: ipstat.ips_cantfrag++;
2012: break;
2013:
2014: case ENOBUFS:
1.143 itojun 2015: #if 1
2016: /*
2017: * a router should not generate ICMP_SOURCEQUENCH as
2018: * required in RFC1812 Requirements for IP Version 4 Routers.
2019: * source quench could be a big problem under DoS attacks,
1.149 wiz 2020: * or if the underlying interface is rate-limited.
1.143 itojun 2021: */
2022: if (mcopy)
2023: m_freem(mcopy);
2024: return;
2025: #else
1.1 cgd 2026: type = ICMP_SOURCEQUENCH;
2027: code = 0;
2028: break;
1.143 itojun 2029: #endif
1.1 cgd 2030: }
1.220 christos 2031: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 2032: }
2033:
2034: void
1.211 perry 2035: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2036: struct mbuf *m)
1.44 thorpej 2037: {
2038:
2039: if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2040: struct timeval tv;
2041:
2042: microtime(&tv);
1.244 christos 2043: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 2044: SCM_TIMESTAMP, SOL_SOCKET);
2045: if (*mp)
2046: mp = &(*mp)->m_next;
2047: }
2048: if (inp->inp_flags & INP_RECVDSTADDR) {
1.244 christos 2049: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 2050: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2051: if (*mp)
2052: mp = &(*mp)->m_next;
2053: }
2054: #ifdef notyet
2055: /*
2056: * XXX
2057: * Moving these out of udp_input() made them even more broken
2058: * than they already were.
2059: * - fenner@parc.xerox.com
2060: */
2061: /* options were tossed already */
2062: if (inp->inp_flags & INP_RECVOPTS) {
1.244 christos 2063: *mp = sbcreatecontrol((void *) opts_deleted_above,
1.44 thorpej 2064: sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2065: if (*mp)
2066: mp = &(*mp)->m_next;
2067: }
2068: /* ip_srcroute doesn't do what we want here, need to fix */
2069: if (inp->inp_flags & INP_RECVRETOPTS) {
1.244 christos 2070: *mp = sbcreatecontrol((void *) ip_srcroute(),
1.44 thorpej 2071: sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2072: if (*mp)
2073: mp = &(*mp)->m_next;
2074: }
2075: #endif
2076: if (inp->inp_flags & INP_RECVIF) {
2077: struct sockaddr_dl sdl;
2078:
1.252 dyoung 2079: sockaddr_dl_init(&sdl, sizeof(sdl),
2080: (m->m_pkthdr.rcvif != NULL)
2081: ? m->m_pkthdr.rcvif->if_index
2082: : 0,
2083: 0, NULL, 0, NULL, 0);
1.251 dyoung 2084: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 2085: if (*mp)
2086: mp = &(*mp)->m_next;
2087: }
1.13 mycroft 2088: }
2089:
1.189 atatat 2090: /*
1.228 elad 2091: * sysctl helper routine for net.inet.ip.forwsrcrt.
2092: */
2093: static int
2094: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
2095: {
2096: int error, tmp;
2097: struct sysctlnode node;
2098:
2099: node = *rnode;
2100: tmp = ip_forwsrcrt;
2101: node.sysctl_data = &tmp;
2102: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2103: if (error || newp == NULL)
2104: return (error);
2105:
1.230 elad 2106: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1.232 elad 2107: 0, NULL, NULL, NULL))
1.228 elad 2108: return (EPERM);
2109:
2110: ip_forwsrcrt = tmp;
2111:
2112: return (0);
2113: }
2114:
2115: /*
1.189 atatat 2116: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
2117: * range of the new value and tweaks timers if it changes.
2118: */
2119: static int
2120: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 2121: {
1.189 atatat 2122: int error, tmp;
2123: struct sysctlnode node;
2124:
2125: node = *rnode;
2126: tmp = ip_mtudisc_timeout;
2127: node.sysctl_data = &tmp;
2128: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2129: if (error || newp == NULL)
2130: return (error);
2131: if (tmp < 0)
2132: return (EINVAL);
1.52 thorpej 2133:
1.189 atatat 2134: ip_mtudisc_timeout = tmp;
2135: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
2136:
2137: return (0);
2138: }
1.54 lukem 2139:
1.65 matt 2140: #ifdef GATEWAY
1.189 atatat 2141: /*
1.247 liamjfoy 2142: * sysctl helper routine for net.inet.ip.maxflows.
1.189 atatat 2143: */
2144: static int
2145: sysctl_net_inet_ip_maxflows(SYSCTLFN_ARGS)
2146: {
2147: int s;
1.67 thorpej 2148:
1.217 atatat 2149: s = sysctl_lookup(SYSCTLFN_CALL(rnode));
1.247 liamjfoy 2150: if (s || newp == NULL)
1.189 atatat 2151: return (s);
1.212 perry 2152:
1.189 atatat 2153: s = splsoftnet();
2154: ipflow_reap(0);
2155: splx(s);
1.144 martin 2156:
1.189 atatat 2157: return (0);
2158: }
1.248 liamjfoy 2159:
2160: static int
2161: sysctl_net_inet_ip_hashsize(SYSCTLFN_ARGS)
2162: {
2163: int error, tmp;
2164: struct sysctlnode node;
2165:
2166: node = *rnode;
2167: tmp = ip_hashsize;
2168: node.sysctl_data = &tmp;
2169: error = sysctl_lookup(SYSCTLFN_CALL(&node));
2170: if (error || newp == NULL)
2171: return (error);
2172:
2173: if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
2174: /*
2175: * Can only fail due to malloc()
2176: */
2177: if (ipflow_invalidate_all(tmp))
2178: return ENOMEM;
2179: } else {
2180: /*
2181: * EINVAL if not a power of 2
2182: */
2183: return EINVAL;
2184: }
2185:
2186: return (0);
2187: }
1.189 atatat 2188: #endif /* GATEWAY */
1.117 tron 2189:
1.131 itojun 2190:
1.189 atatat 2191: SYSCTL_SETUP(sysctl_net_inet_ip_setup, "sysctl net.inet.ip subtree setup")
2192: {
2193: extern int subnetsarelocal, hostzeroisbroadcast;
1.180 jonathan 2194:
1.197 atatat 2195: sysctl_createv(clog, 0, NULL, NULL,
2196: CTLFLAG_PERMANENT,
1.189 atatat 2197: CTLTYPE_NODE, "net", NULL,
2198: NULL, 0, NULL, 0,
2199: CTL_NET, CTL_EOL);
1.197 atatat 2200: sysctl_createv(clog, 0, NULL, NULL,
2201: CTLFLAG_PERMANENT,
1.203 atatat 2202: CTLTYPE_NODE, "inet",
2203: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 2204: NULL, 0, NULL, 0,
2205: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 2206: sysctl_createv(clog, 0, NULL, NULL,
2207: CTLFLAG_PERMANENT,
1.203 atatat 2208: CTLTYPE_NODE, "ip",
2209: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 2210: NULL, 0, NULL, 0,
2211: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 2212:
1.197 atatat 2213: sysctl_createv(clog, 0, NULL, NULL,
2214: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2215: CTLTYPE_INT, "forwarding",
2216: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 2217: NULL, 0, &ipforwarding, 0,
2218: CTL_NET, PF_INET, IPPROTO_IP,
2219: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 2220: sysctl_createv(clog, 0, NULL, NULL,
2221: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2222: CTLTYPE_INT, "redirect",
2223: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 2224: NULL, 0, &ipsendredirects, 0,
2225: CTL_NET, PF_INET, IPPROTO_IP,
2226: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 2227: sysctl_createv(clog, 0, NULL, NULL,
2228: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2229: CTLTYPE_INT, "ttl",
2230: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 2231: NULL, 0, &ip_defttl, 0,
2232: CTL_NET, PF_INET, IPPROTO_IP,
2233: IPCTL_DEFTTL, CTL_EOL);
2234: #ifdef IPCTL_DEFMTU
1.197 atatat 2235: sysctl_createv(clog, 0, NULL, NULL,
2236: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 2237: CTLTYPE_INT, "mtu",
2238: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 2239: NULL, 0, &ip_mtu, 0,
2240: CTL_NET, PF_INET, IPPROTO_IP,
2241: IPCTL_DEFMTU, CTL_EOL);
2242: #endif /* IPCTL_DEFMTU */
1.197 atatat 2243: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 2244: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2245: CTLTYPE_INT, "forwsrcrt",
2246: SYSCTL_DESCR("Enable forwarding of source-routed "
2247: "datagrams"),
1.228 elad 2248: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 2249: CTL_NET, PF_INET, IPPROTO_IP,
2250: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 2251: sysctl_createv(clog, 0, NULL, NULL,
2252: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2253: CTLTYPE_INT, "directed-broadcast",
2254: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 2255: NULL, 0, &ip_directedbcast, 0,
2256: CTL_NET, PF_INET, IPPROTO_IP,
2257: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 2258: sysctl_createv(clog, 0, NULL, NULL,
2259: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2260: CTLTYPE_INT, "allowsrcrt",
2261: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 2262: NULL, 0, &ip_allowsrcrt, 0,
2263: CTL_NET, PF_INET, IPPROTO_IP,
2264: IPCTL_ALLOWSRCRT, CTL_EOL);
1.197 atatat 2265: sysctl_createv(clog, 0, NULL, NULL,
2266: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2267: CTLTYPE_INT, "subnetsarelocal",
2268: SYSCTL_DESCR("Whether logical subnets are considered "
2269: "local"),
1.189 atatat 2270: NULL, 0, &subnetsarelocal, 0,
2271: CTL_NET, PF_INET, IPPROTO_IP,
2272: IPCTL_SUBNETSARELOCAL, CTL_EOL);
1.197 atatat 2273: sysctl_createv(clog, 0, NULL, NULL,
2274: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2275: CTLTYPE_INT, "mtudisc",
2276: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 2277: NULL, 0, &ip_mtudisc, 0,
2278: CTL_NET, PF_INET, IPPROTO_IP,
2279: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 2280: sysctl_createv(clog, 0, NULL, NULL,
2281: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2282: CTLTYPE_INT, "anonportmin",
2283: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 2284: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
2285: CTL_NET, PF_INET, IPPROTO_IP,
2286: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 2287: sysctl_createv(clog, 0, NULL, NULL,
2288: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2289: CTLTYPE_INT, "anonportmax",
2290: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 2291: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
2292: CTL_NET, PF_INET, IPPROTO_IP,
2293: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 2294: sysctl_createv(clog, 0, NULL, NULL,
2295: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2296: CTLTYPE_INT, "mtudisctimeout",
2297: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.189 atatat 2298: sysctl_net_inet_ip_pmtudto, 0, &ip_mtudisc_timeout, 0,
2299: CTL_NET, PF_INET, IPPROTO_IP,
2300: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
2301: #ifdef GATEWAY
1.197 atatat 2302: sysctl_createv(clog, 0, NULL, NULL,
2303: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2304: CTLTYPE_INT, "maxflows",
2305: SYSCTL_DESCR("Number of flows for fast forwarding"),
1.189 atatat 2306: sysctl_net_inet_ip_maxflows, 0, &ip_maxflows, 0,
2307: CTL_NET, PF_INET, IPPROTO_IP,
2308: IPCTL_MAXFLOWS, CTL_EOL);
1.248 liamjfoy 2309: sysctl_createv(clog, 0, NULL, NULL,
2310: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2311: CTLTYPE_INT, "hashsize",
2312: SYSCTL_DESCR("Size of hash table for fast forwarding (IPv4)"),
2313: sysctl_net_inet_ip_hashsize, 0, &ip_hashsize, 0,
2314: CTL_NET, PF_INET, IPPROTO_IP,
2315: CTL_CREATE, CTL_EOL);
1.189 atatat 2316: #endif /* GATEWAY */
1.197 atatat 2317: sysctl_createv(clog, 0, NULL, NULL,
2318: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2319: CTLTYPE_INT, "hostzerobroadcast",
2320: SYSCTL_DESCR("All zeroes address is broadcast address"),
1.189 atatat 2321: NULL, 0, &hostzeroisbroadcast, 0,
2322: CTL_NET, PF_INET, IPPROTO_IP,
2323: IPCTL_HOSTZEROBROADCAST, CTL_EOL);
2324: #if NGIF > 0
1.197 atatat 2325: sysctl_createv(clog, 0, NULL, NULL,
2326: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2327: CTLTYPE_INT, "gifttl",
2328: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 2329: NULL, 0, &ip_gif_ttl, 0,
2330: CTL_NET, PF_INET, IPPROTO_IP,
2331: IPCTL_GIF_TTL, CTL_EOL);
2332: #endif /* NGIF */
2333: #ifndef IPNOPRIVPORTS
1.197 atatat 2334: sysctl_createv(clog, 0, NULL, NULL,
2335: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2336: CTLTYPE_INT, "lowportmin",
2337: SYSCTL_DESCR("Lowest privileged ephemeral port number "
2338: "to assign"),
1.189 atatat 2339: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
2340: CTL_NET, PF_INET, IPPROTO_IP,
2341: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 2342: sysctl_createv(clog, 0, NULL, NULL,
2343: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2344: CTLTYPE_INT, "lowportmax",
2345: SYSCTL_DESCR("Highest privileged ephemeral port number "
2346: "to assign"),
1.189 atatat 2347: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
2348: CTL_NET, PF_INET, IPPROTO_IP,
2349: IPCTL_LOWPORTMAX, CTL_EOL);
2350: #endif /* IPNOPRIVPORTS */
1.197 atatat 2351: sysctl_createv(clog, 0, NULL, NULL,
2352: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2353: CTLTYPE_INT, "maxfragpackets",
2354: SYSCTL_DESCR("Maximum number of fragments to retain for "
2355: "possible reassembly"),
1.189 atatat 2356: NULL, 0, &ip_maxfragpackets, 0,
2357: CTL_NET, PF_INET, IPPROTO_IP,
2358: IPCTL_MAXFRAGPACKETS, CTL_EOL);
2359: #if NGRE > 0
1.197 atatat 2360: sysctl_createv(clog, 0, NULL, NULL,
2361: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2362: CTLTYPE_INT, "grettl",
2363: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 2364: NULL, 0, &ip_gre_ttl, 0,
2365: CTL_NET, PF_INET, IPPROTO_IP,
2366: IPCTL_GRE_TTL, CTL_EOL);
2367: #endif /* NGRE */
1.197 atatat 2368: sysctl_createv(clog, 0, NULL, NULL,
2369: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2370: CTLTYPE_INT, "checkinterface",
2371: SYSCTL_DESCR("Enable receive side of Strong ES model "
2372: "from RFC1122"),
1.189 atatat 2373: NULL, 0, &ip_checkinterface, 0,
2374: CTL_NET, PF_INET, IPPROTO_IP,
2375: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 2376: sysctl_createv(clog, 0, NULL, NULL,
2377: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 2378: CTLTYPE_INT, "random_id",
2379: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 2380: NULL, 0, &ip_do_randomid, 0,
2381: CTL_NET, PF_INET, IPPROTO_IP,
2382: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 2383: sysctl_createv(clog, 0, NULL, NULL,
2384: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
2385: CTLTYPE_INT, "do_loopback_cksum",
2386: SYSCTL_DESCR("Perform IP checksum on loopback"),
2387: NULL, 0, &ip_do_loopback_cksum, 0,
2388: CTL_NET, PF_INET, IPPROTO_IP,
2389: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 2390: sysctl_createv(clog, 0, NULL, NULL,
2391: CTLFLAG_PERMANENT,
2392: CTLTYPE_STRUCT, "stats",
2393: SYSCTL_DESCR("IP statistics"),
2394: NULL, 0, &ipstat, sizeof(ipstat),
2395: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
2396: CTL_EOL);
1.1 cgd 2397: }
CVSweb <webmaster@jp.NetBSD.org>