Annotation of src/sys/netinet/ip_input.c, Revision 1.311
1.311 ! rmind 1: /* $NetBSD: ip_input.c,v 1.310 2014/03/19 08:27:21 liamjfoy Exp $ */
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: *
49: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59: * POSSIBILITY OF SUCH DAMAGE.
60: */
1.14 cgd 61:
1.1 cgd 62: /*
1.13 mycroft 63: * Copyright (c) 1982, 1986, 1988, 1993
64: * The Regents of the University of California. All rights reserved.
1.1 cgd 65: *
66: * Redistribution and use in source and binary forms, with or without
67: * modification, are permitted provided that the following conditions
68: * are met:
69: * 1. Redistributions of source code must retain the above copyright
70: * notice, this list of conditions and the following disclaimer.
71: * 2. Redistributions in binary form must reproduce the above copyright
72: * notice, this list of conditions and the following disclaimer in the
73: * documentation and/or other materials provided with the distribution.
1.172 agc 74: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 75: * may be used to endorse or promote products derived from this software
76: * without specific prior written permission.
77: *
78: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
79: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
80: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
81: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
82: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
83: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
84: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
85: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
86: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
87: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
88: * SUCH DAMAGE.
89: *
1.14 cgd 90: * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
1.1 cgd 91: */
1.141 lukem 92:
93: #include <sys/cdefs.h>
1.311 ! rmind 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.310 2014/03/19 08:27:21 liamjfoy Exp $");
1.55 scottr 95:
1.184 jonathan 96: #include "opt_inet.h"
1.278 christos 97: #include "opt_compat_netbsd.h"
1.62 matt 98: #include "opt_gateway.h"
1.91 thorpej 99: #include "opt_ipsec.h"
1.55 scottr 100: #include "opt_mrouting.h"
1.167 martin 101: #include "opt_mbuftrace.h"
1.135 thorpej 102: #include "opt_inet_csum.h"
1.1 cgd 103:
1.5 mycroft 104: #include <sys/param.h>
105: #include <sys/systm.h>
106: #include <sys/mbuf.h>
107: #include <sys/domain.h>
108: #include <sys/protosw.h>
109: #include <sys/socket.h>
1.44 thorpej 110: #include <sys/socketvar.h>
1.5 mycroft 111: #include <sys/errno.h>
112: #include <sys/time.h>
113: #include <sys/kernel.h>
1.72 thorpej 114: #include <sys/pool.h>
1.28 christos 115: #include <sys/sysctl.h>
1.230 elad 116: #include <sys/kauth.h>
1.1 cgd 117:
1.5 mycroft 118: #include <net/if.h>
1.44 thorpej 119: #include <net/if_dl.h>
1.5 mycroft 120: #include <net/route.h>
1.45 mrg 121: #include <net/pfil.h>
1.1 cgd 122:
1.5 mycroft 123: #include <netinet/in.h>
124: #include <netinet/in_systm.h>
125: #include <netinet/ip.h>
126: #include <netinet/in_pcb.h>
1.215 yamt 127: #include <netinet/in_proto.h>
1.5 mycroft 128: #include <netinet/in_var.h>
129: #include <netinet/ip_var.h>
1.266 thorpej 130: #include <netinet/ip_private.h>
1.5 mycroft 131: #include <netinet/ip_icmp.h>
1.89 itojun 132: /* just for gif_ttl */
133: #include <netinet/in_gif.h>
134: #include "gif.h"
1.144 martin 135: #include <net/if_gre.h>
136: #include "gre.h"
1.111 jdolecek 137:
138: #ifdef MROUTING
139: #include <netinet/ip_mroute.h>
140: #endif
1.302 christos 141: #include <netinet/portalgo.h>
1.89 itojun 142:
1.304 christos 143: #ifdef IPSEC
1.173 jonathan 144: #include <netipsec/ipsec.h>
1.305 rmind 145: #endif
1.44 thorpej 146:
1.1 cgd 147: #ifndef IPFORWARDING
148: #ifdef GATEWAY
149: #define IPFORWARDING 1 /* forward IP packets not for us */
150: #else /* GATEWAY */
151: #define IPFORWARDING 0 /* don't forward IP packets not for us */
152: #endif /* GATEWAY */
153: #endif /* IPFORWARDING */
154: #ifndef IPSENDREDIRECTS
155: #define IPSENDREDIRECTS 1
156: #endif
1.26 thorpej 157: #ifndef IPFORWSRCRT
1.47 cjs 158: #define IPFORWSRCRT 1 /* forward source-routed packets */
159: #endif
160: #ifndef IPALLOWSRCRT
1.48 mrg 161: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 162: #endif
1.53 kml 163: #ifndef IPMTUDISC
1.153 itojun 164: #define IPMTUDISC 1
1.53 kml 165: #endif
1.60 kml 166: #ifndef IPMTUDISCTIMEOUT
1.61 kml 167: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 168: #endif
1.53 kml 169:
1.278 christos 170: #ifdef COMPAT_50
171: #include <compat/sys/time.h>
172: #include <compat/sys/socket.h>
173: #endif
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;
1.156 itojun 193: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 194: #ifdef DIAGNOSTIC
195: int ipprintfs = 0;
196: #endif
1.184 jonathan 197:
198: int ip_do_randomid = 0;
199:
1.165 christos 200: /*
201: * XXX - Setting ip_checkinterface mostly implements the receive side of
202: * the Strong ES model described in RFC 1122, but since the routing table
203: * and transmit implementation do not implement the Strong ES model,
204: * setting this to 1 results in an odd hybrid.
205: *
206: * XXX - ip_checkinterface currently must be disabled if you use ipnat
207: * to translate the destination address to another local interface.
208: *
209: * XXX - ip_checkinterface must be disabled if you add IP aliases
210: * to the loopback interface instead of the interface where the
211: * packets for those addresses are received.
212: */
213: int ip_checkinterface = 0;
214:
1.60 kml 215: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
216:
1.13 mycroft 217: struct ifqueue ipintrq;
1.286 tls 218:
1.291 rmind 219: ipid_state_t * ip_ids;
1.183 jonathan 220: uint16_t ip_id;
1.75 thorpej 221:
1.266 thorpej 222: percpu_t *ipstat_percpu;
223:
1.308 rmind 224: pfil_head_t *inet_pfil_hook;
1.121 thorpej 225:
1.135 thorpej 226: #ifdef INET_CSUM_COUNTERS
227: #include <sys/device.h>
228:
229: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
230: NULL, "inet", "hwcsum bad");
231: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
232: NULL, "inet", "hwcsum ok");
233: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
234: NULL, "inet", "swcsum");
235:
236: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
237:
1.201 matt 238: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
239: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
240: EVCNT_ATTACH_STATIC(ip_swcsum);
241:
1.135 thorpej 242: #else
243:
244: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
245:
246: #endif /* INET_CSUM_COUNTERS */
247:
1.1 cgd 248: /*
249: * We need to save the IP options in case a protocol wants to respond
250: * to an incoming packet over the same route if the packet got here
251: * using IP source routing. This allows connection establishment and
252: * maintenance when the remote end is on a network that is not known
253: * to us.
254: */
1.311 ! rmind 255:
! 256: static int ip_nhops = 0;
! 257:
1.1 cgd 258: static struct ip_srcrt {
259: struct in_addr dst; /* final destination */
260: char nop; /* one NOP to align */
261: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
262: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
263: } ip_srcrt;
264:
1.295 dyoung 265: static int ip_drainwanted;
266:
1.210 perry 267: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 268:
1.164 matt 269: #ifdef MBUFTRACE
1.234 dogcow 270: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
271: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 272: #endif
273:
1.311 ! rmind 274: static bool ip_dooptions(struct mbuf *);
! 275: static struct in_ifaddr *ip_rtaddr(struct in_addr);
! 276: static void sysctl_net_inet_ip_setup(struct sysctllog **);
1.284 pooka 277:
1.1 cgd 278: /*
279: * IP initialization: fill in IP protocol switch table.
280: * All protocols not implemented in kernel go to raw IP protocol handler.
281: */
1.8 mycroft 282: void
1.211 perry 283: ip_init(void)
1.1 cgd 284: {
1.199 matt 285: const struct protosw *pr;
1.1 cgd 286:
1.311 ! rmind 287: in_init();
1.284 pooka 288: sysctl_net_inet_ip_setup(NULL);
289:
1.311 ! rmind 290: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
! 291: KASSERT(pr != NULL);
1.275 pooka 292:
1.311 ! rmind 293: for (u_int i = 0; i < IPPROTO_MAX; i++) {
1.1 cgd 294: ip_protox[i] = pr - inetsw;
1.311 ! rmind 295: }
1.1 cgd 296: for (pr = inetdomain.dom_protosw;
297: pr < inetdomain.dom_protoswNPROTOSW; pr++)
298: if (pr->pr_domain->dom_family == PF_INET &&
299: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
300: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 301:
1.288 rmind 302: ip_reass_init();
1.190 jonathan 303:
1.291 rmind 304: ip_ids = ip_id_init();
1.227 kardel 305: ip_id = time_second & 0xfffff;
1.194 jonathan 306:
1.294 dyoung 307: ipintrq.ifq_maxlen = IFQ_MAXLEN;
1.194 jonathan 308:
1.160 itojun 309: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 310: #ifdef GATEWAY
1.311 ! rmind 311: ipflow_init();
1.73 thorpej 312: #endif
1.121 thorpej 313:
314: /* Register our Packet Filter hook. */
1.308 rmind 315: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
316: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 317:
1.164 matt 318: #ifdef MBUFTRACE
319: MOWNER_ATTACH(&ip_tx_mowner);
320: MOWNER_ATTACH(&ip_rx_mowner);
321: #endif /* MBUFTRACE */
1.266 thorpej 322:
323: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 324: }
325:
1.229 christos 326: struct sockaddr_in ipaddr = {
327: .sin_len = sizeof(ipaddr),
328: .sin_family = AF_INET,
329: };
1.311 ! rmind 330:
! 331: static struct route ipforward_rt;
1.1 cgd 332:
333: /*
1.89 itojun 334: * IP software interrupt routine
335: */
336: void
1.211 perry 337: ipintr(void)
1.89 itojun 338: {
339: int s;
340: struct mbuf *m;
1.286 tls 341: struct ifqueue lcl_intrq;
342:
343: memset(&lcl_intrq, 0, sizeof(lcl_intrq));
1.89 itojun 344:
1.268 ad 345: mutex_enter(softnet_lock);
346: KERNEL_LOCK(1, NULL);
1.286 tls 347: if (!IF_IS_EMPTY(&ipintrq)) {
1.132 thorpej 348: s = splnet();
1.286 tls 349:
350: /* Take existing queue onto stack */
351: lcl_intrq = ipintrq;
352:
353: /* Zero out global queue, preserving maxlen and drops */
354: ipintrq.ifq_head = NULL;
355: ipintrq.ifq_tail = NULL;
356: ipintrq.ifq_len = 0;
357: ipintrq.ifq_maxlen = lcl_intrq.ifq_maxlen;
358: ipintrq.ifq_drops = lcl_intrq.ifq_drops;
359:
1.89 itojun 360: splx(s);
1.286 tls 361: }
362: KERNEL_UNLOCK_ONE(NULL);
363: while (!IF_IS_EMPTY(&lcl_intrq)) {
364: IF_DEQUEUE(&lcl_intrq, m);
1.268 ad 365: if (m == NULL)
366: break;
1.89 itojun 367: ip_input(m);
368: }
1.268 ad 369: mutex_exit(softnet_lock);
1.89 itojun 370: }
371:
372: /*
1.1 cgd 373: * Ip input routine. Checksum and byte swap header. If fragmented
374: * try to reassemble. Process options. Pass to next level.
375: */
1.8 mycroft 376: void
1.89 itojun 377: ip_input(struct mbuf *m)
1.1 cgd 378: {
1.109 augustss 379: struct ip *ip = NULL;
380: struct in_ifaddr *ia;
381: struct ifaddr *ifa;
1.288 rmind 382: int hlen = 0, len;
1.100 itojun 383: int downmatch;
1.165 christos 384: int checkif;
1.169 itojun 385: int srcrt = 0;
1.1 cgd 386:
1.164 matt 387: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 388: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.164 matt 389:
1.1 cgd 390: /*
391: * If no IP addresses have been set yet but the interfaces
392: * are receiving, can't do anything with incoming packets yet.
393: */
1.181 jonathan 394: if (TAILQ_FIRST(&in_ifaddrhead) == 0)
1.1 cgd 395: goto bad;
1.266 thorpej 396: IP_STATINC(IP_STAT_TOTAL);
1.154 thorpej 397: /*
398: * If the IP header is not aligned, slurp it up into a new
399: * mbuf with space for link headers, in the event we forward
400: * it. Otherwise, if it is aligned, make sure the entire
401: * base IP header is in the first mbuf of the chain.
402: */
1.244 christos 403: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 404: if ((m = m_copyup(m, sizeof(struct ip),
405: (max_linkhdr + 3) & ~3)) == NULL) {
406: /* XXXJRT new stat, please */
1.266 thorpej 407: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 408: return;
409: }
410: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
411: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 412: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 413: return;
414: }
1.1 cgd 415: }
416: ip = mtod(m, struct ip *);
1.13 mycroft 417: if (ip->ip_v != IPVERSION) {
1.266 thorpej 418: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 419: goto bad;
420: }
1.1 cgd 421: hlen = ip->ip_hl << 2;
422: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 423: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 424: goto bad;
425: }
426: if (hlen > m->m_len) {
1.298 liamjfoy 427: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 428: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 429: return;
1.1 cgd 430: }
431: ip = mtod(m, struct ip *);
432: }
1.98 thorpej 433:
1.85 hwr 434: /*
1.99 thorpej 435: * RFC1122: packets with a multicast source address are
1.98 thorpej 436: * not allowed.
1.85 hwr 437: */
438: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 439: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 440: goto bad;
1.129 itojun 441: }
442:
443: /* 127/8 must not appear on wire - RFC1122 */
444: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
445: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.130 itojun 446: if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 447: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 448: goto bad;
1.130 itojun 449: }
1.85 hwr 450: }
451:
1.135 thorpej 452: switch (m->m_pkthdr.csum_flags &
1.137 thorpej 453: ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 454: M_CSUM_IPv4_BAD)) {
455: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
456: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
457: goto badcsum;
458:
459: case M_CSUM_IPv4:
460: /* Checksum was okay. */
461: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
462: break;
463:
464: default:
1.206 thorpej 465: /*
466: * Must compute it ourselves. Maybe skip checksum on
467: * loopback interfaces.
468: */
469: if (__predict_true(!(m->m_pkthdr.rcvif->if_flags &
470: IFF_LOOPBACK) || ip_do_loopback_cksum)) {
471: INET_CSUM_COUNTER_INCR(&ip_swcsum);
472: if (in_cksum(m, hlen) != 0)
473: goto badcsum;
474: }
1.135 thorpej 475: break;
1.1 cgd 476: }
477:
1.121 thorpej 478: /* Retrieve the packet length. */
479: len = ntohs(ip->ip_len);
1.81 proff 480:
481: /*
482: * Check for additional length bogosity
483: */
1.84 proff 484: if (len < hlen) {
1.266 thorpej 485: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 486: goto bad;
487: }
1.1 cgd 488:
489: /*
490: * Check that the amount of data in the buffers
491: * is as at least much as the IP header would have us expect.
492: * Trim mbufs if longer than we expect.
493: * Drop packet if shorter than we expect.
494: */
1.35 mycroft 495: if (m->m_pkthdr.len < len) {
1.266 thorpej 496: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 497: goto bad;
498: }
1.35 mycroft 499: if (m->m_pkthdr.len > len) {
1.1 cgd 500: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 501: m->m_len = len;
502: m->m_pkthdr.len = len;
1.1 cgd 503: } else
1.35 mycroft 504: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 505: }
506:
1.64 thorpej 507: /*
508: * Assume that we can create a fast-forward IP flow entry
509: * based on this packet.
510: */
511: m->m_flags |= M_CANFASTFWD;
512:
1.33 mrg 513: /*
1.64 thorpej 514: * Run through list of hooks for input packets. If there are any
515: * filters which require that additional packets in the flow are
516: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
517: * Note that filters must _never_ set this flag, as another filter
518: * in the list may have previously cleared it.
1.33 mrg 519: */
1.127 itojun 520: /*
521: * let ipfilter look at packet on the wire,
522: * not the decapsulated packet.
523: */
1.304 christos 524: #if defined(IPSEC)
1.186 scw 525: if (!ipsec_indone(m))
1.127 itojun 526: #else
527: if (1)
528: #endif
529: {
1.169 itojun 530: struct in_addr odst;
531:
532: odst = ip->ip_dst;
1.308 rmind 533: if (pfil_run_hooks(inet_pfil_hook, &m, m->m_pkthdr.rcvif,
1.168 itojun 534: PFIL_IN) != 0)
535: return;
1.127 itojun 536: if (m == NULL)
537: return;
538: ip = mtod(m, struct ip *);
1.142 darrenr 539: hlen = ip->ip_hl << 2;
1.205 darrenr 540: /*
541: * XXX The setting of "srcrt" here is to prevent ip_forward()
542: * from generating ICMP redirects for packets that have
543: * been redirected by a hook back out on to the same LAN that
544: * they came from and is not an indication that the packet
545: * is being inffluenced by source routing options. This
546: * allows things like
547: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
548: * where tlp0 is both on the 1.1.1.0/24 network and is the
549: * default route for hosts on 1.1.1.0/24. Of course this
550: * also requires a "map tlp0 ..." to complete the story.
551: * One might argue whether or not this kind of network config.
1.212 perry 552: * should be supported in this manner...
1.205 darrenr 553: */
1.169 itojun 554: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 555: }
1.123 thorpej 556:
557: #ifdef ALTQ
558: /* XXX Temporary until ALTQ is changed to use a pfil hook */
559: if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
560: /* packet dropped by traffic conditioner */
561: return;
562: }
563: #endif
1.121 thorpej 564:
565: /*
1.1 cgd 566: * Process options and, if not destined for us,
567: * ship it on. ip_dooptions returns 1 when an
568: * error was detected (causing an icmp message
569: * to be sent and the original packet to be freed).
570: */
571: ip_nhops = 0; /* for source routed packets */
572: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 573: return;
1.1 cgd 574:
575: /*
1.165 christos 576: * Enable a consistency check between the destination address
577: * and the arrival interface for a unicast packet (the RFC 1122
578: * strong ES model) if IP forwarding is disabled and the packet
579: * is not locally generated.
580: *
581: * XXX - Checking also should be disabled if the destination
582: * address is ipnat'ed to a different interface.
583: *
584: * XXX - Checking is incompatible with IP aliases added
585: * to the loopback interface instead of the interface where
586: * the packets are received.
587: *
588: * XXX - We need to add a per ifaddr flag for this so that
589: * we get finer grain control.
590: */
591: checkif = ip_checkinterface && (ipforwarding == 0) &&
592: (m->m_pkthdr.rcvif != NULL) &&
593: ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0);
594:
595: /*
1.1 cgd 596: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 597: *
598: * Traditional 4.4BSD did not consult IFF_UP at all.
599: * The behavior here is to treat addresses on !IFF_UP interface
600: * as not mine.
1.1 cgd 601: */
1.100 itojun 602: downmatch = 0;
1.140 matt 603: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 604: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.165 christos 605: if (checkif && ia->ia_ifp != m->m_pkthdr.rcvif)
606: continue;
1.97 itojun 607: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
608: break;
1.100 itojun 609: else
610: downmatch++;
1.97 itojun 611: }
612: }
1.86 thorpej 613: if (ia != NULL)
614: goto ours;
1.225 christos 615: if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
1.209 matt 616: IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
1.140 matt 617: if (ifa->ifa_addr->sa_family != AF_INET)
618: continue;
1.57 tls 619: ia = ifatoia(ifa);
1.35 mycroft 620: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
621: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 622: /*
623: * Look for all-0's host part (old broadcast addr),
624: * either for subnet or net.
625: */
626: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 627: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 628: goto ours;
1.57 tls 629: /*
630: * An interface with IP address zero accepts
631: * all packets that arrive on that interface.
632: */
633: if (in_nullhost(ia->ia_addr.sin_addr))
634: goto ours;
1.1 cgd 635: }
636: }
1.18 mycroft 637: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 638: struct in_multi *inm;
639: #ifdef MROUTING
640: extern struct socket *ip_mrouter;
1.10 brezak 641:
1.4 hpeyerl 642: if (ip_mrouter) {
643: /*
644: * If we are acting as a multicast router, all
645: * incoming multicast packets are passed to the
646: * kernel-level multicast forwarding function.
647: * The packet is returned (relatively) intact; if
648: * ip_mforward() returns a non-zero value, the packet
649: * must be discarded, else it may be accepted below.
650: *
651: * (The IP ident field is put in the same byte order
652: * as expected when ip_mforward() is called from
653: * ip_output().)
654: */
1.13 mycroft 655: if (ip_mforward(m, m->m_pkthdr.rcvif) != 0) {
1.266 thorpej 656: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 657: m_freem(m);
1.89 itojun 658: return;
1.4 hpeyerl 659: }
660:
661: /*
662: * The process-level routing demon needs to receive
663: * all multicast IGMP packets, whether or not this
664: * host belongs to their destination groups.
665: */
666: if (ip->ip_p == IPPROTO_IGMP)
667: goto ours;
1.266 thorpej 668: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 669: }
670: #endif
671: /*
672: * See if we belong to the destination multicast group on the
673: * arrival interface.
674: */
675: IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
676: if (inm == NULL) {
1.266 thorpej 677: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 678: m_freem(m);
1.89 itojun 679: return;
1.4 hpeyerl 680: }
681: goto ours;
682: }
1.19 mycroft 683: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 684: in_nullhost(ip->ip_dst))
1.1 cgd 685: goto ours;
686:
687: /*
688: * Not for us; forward if possible and desirable.
689: */
690: if (ipforwarding == 0) {
1.266 thorpej 691: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 692: m_freem(m);
1.100 itojun 693: } else {
694: /*
695: * If ip_dst matched any of my address on !IFF_UP interface,
696: * and there's no IFF_UP interface that matches ip_dst,
697: * send icmp unreach. Forwarding it will result in in-kernel
698: * forwarding loop till TTL goes to 0.
699: */
700: if (downmatch) {
701: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 702: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 703: return;
704: }
1.304 christos 705: #ifdef IPSEC
1.305 rmind 706: /* Perform IPsec, if any. */
707: if (ipsec4_input(m, IP_FORWARDING | (ip_directedbcast ?
708: IP_ALLOWBROADCAST : 0)) != 0) {
1.173 jonathan 709: goto bad;
710: }
1.305 rmind 711: #endif
1.169 itojun 712: ip_forward(m, srcrt);
1.100 itojun 713: }
1.89 itojun 714: return;
1.1 cgd 715:
716: ours:
717: /*
718: * If offset or IP_MF are set, must reassemble.
719: */
1.155 itojun 720: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 721: /*
722: * Pass to IP reassembly mechanism.
723: */
1.290 rmind 724: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 725: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 726: goto bad;
1.16 cgd 727: }
1.290 rmind 728: if (m == NULL) {
1.289 rmind 729: /* More fragments should come; silently return. */
730: return;
731: }
1.290 rmind 732: /*
733: * Reassembly is done, we have the final packet.
734: * Updated cached data in local variable(s).
735: */
1.289 rmind 736: ip = mtod(m, struct ip *);
737: hlen = ip->ip_hl << 2;
1.79 mycroft 738: }
1.128 itojun 739:
1.304 christos 740: #ifdef IPSEC
1.173 jonathan 741: /*
1.305 rmind 742: * Enforce IPsec policy checking if we are seeing last header.
743: * Note that we do not visit this with protocols with PCB layer
744: * code - like UDP/TCP/raw IP.
1.173 jonathan 745: */
746: if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.305 rmind 747: if (ipsec4_input(m, 0) != 0) {
748: goto bad;
1.173 jonathan 749: }
750: }
1.305 rmind 751: #endif
1.1 cgd 752:
753: /*
754: * Switch out to protocol's input routine.
755: */
1.82 aidan 756: #if IFA_STATS
1.122 itojun 757: if (ia && ip)
1.155 itojun 758: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 759: #endif
1.266 thorpej 760: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 761: {
762: int off = hlen, nh = ip->ip_p;
763:
764: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
765: return;
766: }
1.1 cgd 767: bad:
768: m_freem(m);
1.135 thorpej 769: return;
770:
771: badcsum:
1.266 thorpej 772: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 773: m_freem(m);
1.1 cgd 774: }
775:
776: /*
1.288 rmind 777: * IP timer processing.
1.1 cgd 778: */
1.8 mycroft 779: void
1.211 perry 780: ip_slowtimo(void)
1.1 cgd 781: {
1.268 ad 782:
783: mutex_enter(softnet_lock);
784: KERNEL_LOCK(1, NULL);
1.1 cgd 785:
1.288 rmind 786: ip_reass_slowtimo();
1.268 ad 787:
788: KERNEL_UNLOCK_ONE(NULL);
789: mutex_exit(softnet_lock);
1.1 cgd 790: }
791:
792: /*
1.288 rmind 793: * IP drain processing.
1.1 cgd 794: */
1.8 mycroft 795: void
1.211 perry 796: ip_drain(void)
1.1 cgd 797: {
798:
1.268 ad 799: KERNEL_LOCK(1, NULL);
1.288 rmind 800: ip_reass_drain();
1.268 ad 801: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 802: }
803:
804: /*
1.311 ! rmind 805: * ip_dooptions: perform option processing on a datagram, possibly discarding
! 806: * it if bad options are encountered, or forwarding it if source-routed.
! 807: *
! 808: * => Returns true if packet has been forwarded/freed.
! 809: * => Returns false if the packet should be processed further.
1.1 cgd 810: */
1.311 ! rmind 811: static bool
1.211 perry 812: ip_dooptions(struct mbuf *m)
1.1 cgd 813: {
1.109 augustss 814: struct ip *ip = mtod(m, struct ip *);
815: u_char *cp, *cp0;
816: struct ip_timestamp *ipt;
817: struct in_ifaddr *ia;
1.1 cgd 818: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 819: struct in_addr dst;
1.1 cgd 820: n_time ntime;
821:
1.13 mycroft 822: dst = ip->ip_dst;
1.1 cgd 823: cp = (u_char *)(ip + 1);
824: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
825: for (; cnt > 0; cnt -= optlen, cp += optlen) {
826: opt = cp[IPOPT_OPTVAL];
827: if (opt == IPOPT_EOL)
828: break;
829: if (opt == IPOPT_NOP)
830: optlen = 1;
831: else {
1.113 itojun 832: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
833: code = &cp[IPOPT_OLEN] - (u_char *)ip;
834: goto bad;
835: }
1.1 cgd 836: optlen = cp[IPOPT_OLEN];
1.114 itojun 837: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 838: code = &cp[IPOPT_OLEN] - (u_char *)ip;
839: goto bad;
840: }
841: }
842: switch (opt) {
843:
844: default:
845: break;
846:
847: /*
848: * Source routing with record.
849: * Find interface with current destination address.
850: * If none on this machine then drop if strictly routed,
851: * or do nothing if loosely routed.
852: * Record interface address and bring up next address
853: * component. If strictly routed make sure next
854: * address is on directly accessible net.
855: */
856: case IPOPT_LSRR:
857: case IPOPT_SSRR:
1.47 cjs 858: if (ip_allowsrcrt == 0) {
859: type = ICMP_UNREACH;
860: code = ICMP_UNREACH_NET_PROHIB;
861: goto bad;
862: }
1.114 itojun 863: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
864: code = &cp[IPOPT_OLEN] - (u_char *)ip;
865: goto bad;
866: }
1.1 cgd 867: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
868: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
869: goto bad;
870: }
871: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 872: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 873: if (ia == 0) {
874: if (opt == IPOPT_SSRR) {
875: type = ICMP_UNREACH;
876: code = ICMP_UNREACH_SRCFAIL;
877: goto bad;
878: }
879: /*
880: * Loose routing, and not at next destination
881: * yet; nothing to do except forward.
882: */
883: break;
884: }
885: off--; /* 0 origin */
1.112 sommerfe 886: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 887: /*
888: * End of source route. Should be for us.
889: */
890: save_rte(cp, ip->ip_src);
891: break;
892: }
893: /*
894: * locate outgoing interface
895: */
1.281 tsutsui 896: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 897: sizeof(ipaddr.sin_addr));
1.96 thorpej 898: if (opt == IPOPT_SSRR)
1.196 itojun 899: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 900: else
1.1 cgd 901: ia = ip_rtaddr(ipaddr.sin_addr);
902: if (ia == 0) {
903: type = ICMP_UNREACH;
904: code = ICMP_UNREACH_SRCFAIL;
905: goto bad;
906: }
907: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 908: bcopy((void *)&ia->ia_addr.sin_addr,
909: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 910: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 911: /*
912: * Let ip_intr's mcast routing check handle mcast pkts
913: */
1.18 mycroft 914: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 915: break;
916:
917: case IPOPT_RR:
1.114 itojun 918: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
919: code = &cp[IPOPT_OLEN] - (u_char *)ip;
920: goto bad;
921: }
1.1 cgd 922: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
923: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
924: goto bad;
925: }
926: /*
927: * If no space remains, ignore.
928: */
929: off--; /* 0 origin */
1.112 sommerfe 930: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 931: break;
1.281 tsutsui 932: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 933: sizeof(ipaddr.sin_addr));
934: /*
935: * locate outgoing interface; if we're the destination,
936: * use the incoming interface (should be same).
937: */
1.96 thorpej 938: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
939: == NULL &&
940: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 941: type = ICMP_UNREACH;
942: code = ICMP_UNREACH_HOST;
943: goto bad;
944: }
1.244 christos 945: bcopy((void *)&ia->ia_addr.sin_addr,
946: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 947: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
948: break;
949:
950: case IPOPT_TS:
951: code = cp - (u_char *)ip;
952: ipt = (struct ip_timestamp *)cp;
1.114 itojun 953: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
954: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 955: goto bad;
1.114 itojun 956: }
957: if (ipt->ipt_ptr < 5) {
958: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
959: goto bad;
960: }
1.15 cgd 961: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 962: if (++ipt->ipt_oflw == 0) {
963: code = (u_char *)&ipt->ipt_ptr -
964: (u_char *)ip;
1.1 cgd 965: goto bad;
1.114 itojun 966: }
1.1 cgd 967: break;
968: }
1.104 thorpej 969: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 970: switch (ipt->ipt_flg) {
971:
972: case IPOPT_TS_TSONLY:
973: break;
974:
975: case IPOPT_TS_TSANDADDR:
1.66 thorpej 976: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 977: sizeof(struct in_addr) > ipt->ipt_len) {
978: code = (u_char *)&ipt->ipt_ptr -
979: (u_char *)ip;
1.1 cgd 980: goto bad;
1.114 itojun 981: }
1.13 mycroft 982: ipaddr.sin_addr = dst;
1.96 thorpej 983: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
984: m->m_pkthdr.rcvif));
1.13 mycroft 985: if (ia == 0)
986: continue;
1.104 thorpej 987: bcopy(&ia->ia_addr.sin_addr,
988: cp0, sizeof(struct in_addr));
1.1 cgd 989: ipt->ipt_ptr += sizeof(struct in_addr);
990: break;
991:
992: case IPOPT_TS_PRESPEC:
1.66 thorpej 993: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 994: sizeof(struct in_addr) > ipt->ipt_len) {
995: code = (u_char *)&ipt->ipt_ptr -
996: (u_char *)ip;
1.1 cgd 997: goto bad;
1.114 itojun 998: }
1.281 tsutsui 999: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1000: sizeof(struct in_addr));
1.96 thorpej 1001: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1002: == NULL)
1.1 cgd 1003: continue;
1004: ipt->ipt_ptr += sizeof(struct in_addr);
1005: break;
1006:
1007: default:
1.114 itojun 1008: /* XXX can't take &ipt->ipt_flg */
1009: code = (u_char *)&ipt->ipt_ptr -
1010: (u_char *)ip + 1;
1.1 cgd 1011: goto bad;
1012: }
1013: ntime = iptime();
1.107 thorpej 1014: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1015: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1016: sizeof(n_time));
1017: ipt->ipt_ptr += sizeof(n_time);
1018: }
1019: }
1020: if (forward) {
1.26 thorpej 1021: if (ip_forwsrcrt == 0) {
1022: type = ICMP_UNREACH;
1023: code = ICMP_UNREACH_SRCFAIL;
1024: goto bad;
1025: }
1.1 cgd 1026: ip_forward(m, 1);
1.311 ! rmind 1027: return true;
1.13 mycroft 1028: }
1.311 ! rmind 1029: return false;
1.1 cgd 1030: bad:
1.13 mycroft 1031: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1032: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 ! rmind 1033: return true;
1.1 cgd 1034: }
1035:
1036: /*
1.311 ! rmind 1037: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1038: * return internet address info of interface to be used to get there.
1039: */
1.311 ! rmind 1040: static struct in_ifaddr *
1.211 perry 1041: ip_rtaddr(struct in_addr dst)
1.1 cgd 1042: {
1.249 dyoung 1043: struct rtentry *rt;
1044: union {
1045: struct sockaddr dst;
1046: struct sockaddr_in dst4;
1047: } u;
1048:
1049: sockaddr_in_init(&u.dst4, &dst, 0);
1050:
1051: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL)
1052: return NULL;
1053:
1054: return ifatoia(rt->rt_ifa);
1.1 cgd 1055: }
1056:
1057: /*
1.311 ! rmind 1058: * save_rte: save incoming source route for use in replies, to be picked
! 1059: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1060: */
1.311 ! rmind 1061: static void
1.211 perry 1062: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1063: {
1064: unsigned olen;
1065:
1066: olen = option[IPOPT_OLEN];
1067: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1068: return;
1.281 tsutsui 1069: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1070: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1071: ip_srcrt.dst = dst;
1072: }
1073:
1074: /*
1075: * Retrieve incoming source route for use in replies,
1076: * in the same form used by setsockopt.
1077: * The first hop is placed before the options, will be removed later.
1078: */
1079: struct mbuf *
1.211 perry 1080: ip_srcroute(void)
1.1 cgd 1081: {
1.109 augustss 1082: struct in_addr *p, *q;
1083: struct mbuf *m;
1.1 cgd 1084:
1085: if (ip_nhops == 0)
1.237 dyoung 1086: return NULL;
1.1 cgd 1087: m = m_get(M_DONTWAIT, MT_SOOPTS);
1088: if (m == 0)
1.237 dyoung 1089: return NULL;
1.1 cgd 1090:
1.164 matt 1091: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1092: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1093:
1094: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1095: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1096: OPTSIZ;
1097:
1098: /*
1099: * First save first hop for return route
1100: */
1101: p = &ip_srcrt.route[ip_nhops - 1];
1102: *(mtod(m, struct in_addr *)) = *p--;
1103:
1104: /*
1105: * Copy option fields and padding (nop) to mbuf.
1106: */
1107: ip_srcrt.nop = IPOPT_NOP;
1108: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1109: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1110: OPTSIZ);
1111: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1112: sizeof(struct in_addr) + OPTSIZ);
1113: #undef OPTSIZ
1114: /*
1115: * Record return path as an IP source route,
1116: * reversing the path (pointers are now aligned).
1117: */
1118: while (p >= ip_srcrt.route) {
1119: *q++ = *p--;
1120: }
1121: /*
1122: * Last hop goes to final destination.
1123: */
1124: *q = ip_srcrt.dst;
1125: return (m);
1126: }
1127:
1.139 matt 1128: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1129: [PRC_MSGSIZE] = EMSGSIZE,
1130: [PRC_HOSTDEAD] = EHOSTDOWN,
1131: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1132: [PRC_UNREACH_NET] = EHOSTUNREACH,
1133: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1134: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1135: [PRC_UNREACH_PORT] = ECONNREFUSED,
1136: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1137: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1138: };
1139:
1.295 dyoung 1140: void
1141: ip_fasttimo(void)
1142: {
1143: if (ip_drainwanted) {
1144: ip_drain();
1145: ip_drainwanted = 0;
1146: }
1147: }
1148:
1149: void
1150: ip_drainstub(void)
1151: {
1152: ip_drainwanted = 1;
1153: }
1154:
1.1 cgd 1155: /*
1156: * Forward a packet. If some error occurs return the sender
1157: * an icmp packet. Note we can't always generate a meaningful
1158: * icmp message because icmp doesn't have a large enough repertoire
1159: * of codes and types.
1160: *
1161: * If not forwarding, just drop the packet. This could be confusing
1162: * if ipforwarding was zero but some routing protocol was advancing
1163: * us as a gateway to somewhere. However, we must let the routing
1164: * protocol deal with that.
1165: *
1166: * The srcrt parameter indicates whether the packet is being forwarded
1167: * via a source route.
1168: */
1.13 mycroft 1169: void
1.211 perry 1170: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1171: {
1.109 augustss 1172: struct ip *ip = mtod(m, struct ip *);
1173: struct rtentry *rt;
1.220 christos 1174: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1175: struct mbuf *mcopy;
1.13 mycroft 1176: n_long dest;
1.249 dyoung 1177: union {
1178: struct sockaddr dst;
1179: struct sockaddr_in dst4;
1180: } u;
1.164 matt 1181:
1182: /*
1183: * We are now in the output path.
1184: */
1185: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1186:
1187: /*
1188: * Clear any in-bound checksum flags for this packet.
1189: */
1190: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1191:
1.13 mycroft 1192: dest = 0;
1.93 sommerfe 1193: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1194: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1195: m_freem(m);
1196: return;
1197: }
1198: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1199: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1 cgd 1200: return;
1201: }
1202:
1.249 dyoung 1203: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1204: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1205: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1206: return;
1.1 cgd 1207: }
1208:
1209: /*
1.34 mycroft 1210: * Save at most 68 bytes of the packet in case
1.1 cgd 1211: * we need to generate an ICMP message to the src.
1.119 itojun 1212: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1213: */
1.155 itojun 1214: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1215: if (mcopy)
1216: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1217:
1.221 christos 1218: ip->ip_ttl -= IPTTLDEC;
1219:
1.1 cgd 1220: /*
1221: * If forwarding packet using same interface that it came in on,
1222: * perhaps should send a redirect to sender to shortcut a hop.
1223: * Only send redirect if source is sending directly to us,
1224: * and if packet was not source routed (or has any options).
1225: * Also, don't send redirect if forwarding using a default route
1226: * or a route modified by a redirect.
1227: */
1228: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1229: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1230: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1231: ipsendredirects && !srcrt) {
1.19 mycroft 1232: if (rt->rt_ifa &&
1233: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1234: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1235: if (rt->rt_flags & RTF_GATEWAY)
1236: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1237: else
1238: dest = ip->ip_dst.s_addr;
1239: /*
1240: * Router requirements says to only send host
1241: * redirects.
1242: */
1243: type = ICMP_REDIRECT;
1244: code = ICMP_REDIRECT_HOST;
1.1 cgd 1245: }
1246: }
1247:
1.238 dyoung 1248: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1249: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1250: NULL, NULL);
1.173 jonathan 1251:
1.1 cgd 1252: if (error)
1.266 thorpej 1253: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1254: else {
1.266 thorpej 1255: uint64_t *ips = IP_STAT_GETREF();
1256: ips[IP_STAT_FORWARD]++;
1257: if (type) {
1258: ips[IP_STAT_REDIRECTSENT]++;
1259: IP_STAT_PUTREF();
1260: } else {
1261: IP_STAT_PUTREF();
1.63 matt 1262: if (mcopy) {
1263: #ifdef GATEWAY
1.64 thorpej 1264: if (mcopy->m_flags & M_CANFASTFWD)
1265: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1266: #endif
1.1 cgd 1267: m_freem(mcopy);
1.63 matt 1268: }
1.1 cgd 1269: return;
1270: }
1271: }
1272: if (mcopy == NULL)
1273: return;
1.13 mycroft 1274:
1.1 cgd 1275: switch (error) {
1276:
1277: case 0: /* forwarded, but need redirect */
1278: /* type, code set above */
1279: break;
1280:
1281: case ENETUNREACH: /* shouldn't happen, checked above */
1282: case EHOSTUNREACH:
1283: case ENETDOWN:
1284: case EHOSTDOWN:
1285: default:
1286: type = ICMP_UNREACH;
1287: code = ICMP_UNREACH_HOST;
1288: break;
1289:
1290: case EMSGSIZE:
1291: type = ICMP_UNREACH;
1292: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1293:
1.274 seanb 1294: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1295: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1296: #ifdef IPSEC
1297: (void)ipsec4_forward(mcopy, &destmtu);
1298: #endif
1.266 thorpej 1299: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1300: break;
1301:
1302: case ENOBUFS:
1.143 itojun 1303: /*
1.311 ! rmind 1304: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
! 1305: * Requirements for IP Version 4 Routers. Source quench can
! 1306: * big problem under DoS attacks or if the underlying
! 1307: * interface is rate-limited.
1.143 itojun 1308: */
1309: if (mcopy)
1310: m_freem(mcopy);
1311: return;
1.1 cgd 1312: }
1.220 christos 1313: icmp_error(mcopy, type, code, dest, destmtu);
1.44 thorpej 1314: }
1315:
1316: void
1.211 perry 1317: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1318: struct mbuf *m)
1.44 thorpej 1319: {
1.311 ! rmind 1320: struct socket *so = inp->inp_socket;
! 1321: int inpflags = inp->inp_flags;
1.44 thorpej 1322:
1.311 ! rmind 1323: if (so->so_options & SO_TIMESTAMP
1.278 christos 1324: #ifdef SO_OTIMESTAMP
1.311 ! rmind 1325: || so->so_options & SO_OTIMESTAMP
1.278 christos 1326: #endif
1327: ) {
1.44 thorpej 1328: struct timeval tv;
1329:
1330: microtime(&tv);
1.278 christos 1331: #ifdef SO_OTIMESTAMP
1.311 ! rmind 1332: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1333: struct timeval50 tv50;
1334: timeval_to_timeval50(&tv, &tv50);
1335: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1336: SCM_OTIMESTAMP, SOL_SOCKET);
1337: } else
1338: #endif
1.244 christos 1339: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1340: SCM_TIMESTAMP, SOL_SOCKET);
1341: if (*mp)
1342: mp = &(*mp)->m_next;
1343: }
1.311 ! rmind 1344: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1345: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1346: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1347: if (*mp)
1348: mp = &(*mp)->m_next;
1349: }
1.311 ! rmind 1350: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1351: struct in_pktinfo ipi;
1.307 christos 1352: ipi.ipi_addr = ip->ip_src;
1.306 christos 1353: ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index;
1354: *mp = sbcreatecontrol((void *) &ipi,
1355: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1356: if (*mp)
1357: mp = &(*mp)->m_next;
1358: }
1.311 ! rmind 1359: if (inpflags & INP_PKTINFO) {
1.306 christos 1360: struct in_pktinfo ipi;
1.307 christos 1361: ipi.ipi_addr = ip->ip_dst;
1.306 christos 1362: ipi.ipi_ifindex = m->m_pkthdr.rcvif->if_index;
1363: *mp = sbcreatecontrol((void *) &ipi,
1364: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1365: if (*mp)
1366: mp = &(*mp)->m_next;
1367: }
1.311 ! rmind 1368: if (inpflags & INP_RECVIF) {
1.44 thorpej 1369: struct sockaddr_dl sdl;
1370:
1.311 ! rmind 1371: sockaddr_dl_init(&sdl, sizeof(sdl), m->m_pkthdr.rcvif ?
! 1372: m->m_pkthdr.rcvif->if_index : 0, 0, NULL, 0, NULL, 0);
1.251 dyoung 1373: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1374: if (*mp)
1375: mp = &(*mp)->m_next;
1376: }
1.311 ! rmind 1377: if (inpflags & INP_RECVTTL) {
1.282 minskim 1378: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1379: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1380: if (*mp)
1381: mp = &(*mp)->m_next;
1382: }
1.13 mycroft 1383: }
1384:
1.189 atatat 1385: /*
1.228 elad 1386: * sysctl helper routine for net.inet.ip.forwsrcrt.
1387: */
1388: static int
1389: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1390: {
1391: int error, tmp;
1392: struct sysctlnode node;
1393:
1394: node = *rnode;
1395: tmp = ip_forwsrcrt;
1396: node.sysctl_data = &tmp;
1397: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1398: if (error || newp == NULL)
1399: return (error);
1400:
1.280 elad 1401: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1402: 0, NULL, NULL, NULL);
1403: if (error)
1404: return (error);
1.228 elad 1405:
1406: ip_forwsrcrt = tmp;
1407:
1408: return (0);
1409: }
1410:
1411: /*
1.189 atatat 1412: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1413: * range of the new value and tweaks timers if it changes.
1414: */
1415: static int
1416: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1417: {
1.189 atatat 1418: int error, tmp;
1419: struct sysctlnode node;
1420:
1421: node = *rnode;
1422: tmp = ip_mtudisc_timeout;
1423: node.sysctl_data = &tmp;
1424: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1425: if (error || newp == NULL)
1426: return (error);
1427: if (tmp < 0)
1428: return (EINVAL);
1.52 thorpej 1429:
1.273 matt 1430: mutex_enter(softnet_lock);
1431:
1.189 atatat 1432: ip_mtudisc_timeout = tmp;
1433: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1434:
1.273 matt 1435: mutex_exit(softnet_lock);
1436:
1.189 atatat 1437: return (0);
1438: }
1.54 lukem 1439:
1.266 thorpej 1440: static int
1441: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1442: {
1443:
1.271 thorpej 1444: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1445: }
1.131 itojun 1446:
1.284 pooka 1447: static void
1448: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1449: {
1.197 atatat 1450: sysctl_createv(clog, 0, NULL, NULL,
1451: CTLFLAG_PERMANENT,
1.203 atatat 1452: CTLTYPE_NODE, "inet",
1453: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1454: NULL, 0, NULL, 0,
1455: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1456: sysctl_createv(clog, 0, NULL, NULL,
1457: CTLFLAG_PERMANENT,
1.203 atatat 1458: CTLTYPE_NODE, "ip",
1459: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1460: NULL, 0, NULL, 0,
1461: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1462:
1.197 atatat 1463: sysctl_createv(clog, 0, NULL, NULL,
1464: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1465: CTLTYPE_INT, "forwarding",
1466: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1467: NULL, 0, &ipforwarding, 0,
1468: CTL_NET, PF_INET, IPPROTO_IP,
1469: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1470: sysctl_createv(clog, 0, NULL, NULL,
1471: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1472: CTLTYPE_INT, "redirect",
1473: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1474: NULL, 0, &ipsendredirects, 0,
1475: CTL_NET, PF_INET, IPPROTO_IP,
1476: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1477: sysctl_createv(clog, 0, NULL, NULL,
1478: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1479: CTLTYPE_INT, "ttl",
1480: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1481: NULL, 0, &ip_defttl, 0,
1482: CTL_NET, PF_INET, IPPROTO_IP,
1483: IPCTL_DEFTTL, CTL_EOL);
1484: #ifdef IPCTL_DEFMTU
1.197 atatat 1485: sysctl_createv(clog, 0, NULL, NULL,
1486: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1487: CTLTYPE_INT, "mtu",
1488: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1489: NULL, 0, &ip_mtu, 0,
1490: CTL_NET, PF_INET, IPPROTO_IP,
1491: IPCTL_DEFMTU, CTL_EOL);
1492: #endif /* IPCTL_DEFMTU */
1.197 atatat 1493: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1494: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1495: CTLTYPE_INT, "forwsrcrt",
1496: SYSCTL_DESCR("Enable forwarding of source-routed "
1497: "datagrams"),
1.228 elad 1498: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1499: CTL_NET, PF_INET, IPPROTO_IP,
1500: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1501: sysctl_createv(clog, 0, NULL, NULL,
1502: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1503: CTLTYPE_INT, "directed-broadcast",
1504: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1505: NULL, 0, &ip_directedbcast, 0,
1506: CTL_NET, PF_INET, IPPROTO_IP,
1507: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1508: sysctl_createv(clog, 0, NULL, NULL,
1509: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1510: CTLTYPE_INT, "allowsrcrt",
1511: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1512: NULL, 0, &ip_allowsrcrt, 0,
1513: CTL_NET, PF_INET, IPPROTO_IP,
1514: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 ! rmind 1515:
1.197 atatat 1516: sysctl_createv(clog, 0, NULL, NULL,
1517: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1518: CTLTYPE_INT, "mtudisc",
1519: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1520: NULL, 0, &ip_mtudisc, 0,
1521: CTL_NET, PF_INET, IPPROTO_IP,
1522: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1523: sysctl_createv(clog, 0, NULL, NULL,
1524: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1525: CTLTYPE_INT, "anonportmin",
1526: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1527: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1528: CTL_NET, PF_INET, IPPROTO_IP,
1529: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1530: sysctl_createv(clog, 0, NULL, NULL,
1531: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1532: CTLTYPE_INT, "anonportmax",
1533: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1534: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1535: CTL_NET, PF_INET, IPPROTO_IP,
1536: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1537: sysctl_createv(clog, 0, NULL, NULL,
1538: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1539: CTLTYPE_INT, "mtudisctimeout",
1540: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1541: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1542: CTL_NET, PF_INET, IPPROTO_IP,
1543: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1544: #if NGIF > 0
1.197 atatat 1545: sysctl_createv(clog, 0, NULL, NULL,
1546: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1547: CTLTYPE_INT, "gifttl",
1548: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 1549: NULL, 0, &ip_gif_ttl, 0,
1550: CTL_NET, PF_INET, IPPROTO_IP,
1551: IPCTL_GIF_TTL, CTL_EOL);
1552: #endif /* NGIF */
1553: #ifndef IPNOPRIVPORTS
1.197 atatat 1554: sysctl_createv(clog, 0, NULL, NULL,
1555: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1556: CTLTYPE_INT, "lowportmin",
1557: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1558: "to assign"),
1.189 atatat 1559: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1560: CTL_NET, PF_INET, IPPROTO_IP,
1561: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1562: sysctl_createv(clog, 0, NULL, NULL,
1563: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1564: CTLTYPE_INT, "lowportmax",
1565: SYSCTL_DESCR("Highest privileged ephemeral port number "
1566: "to assign"),
1.189 atatat 1567: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1568: CTL_NET, PF_INET, IPPROTO_IP,
1569: IPCTL_LOWPORTMAX, CTL_EOL);
1570: #endif /* IPNOPRIVPORTS */
1571: #if NGRE > 0
1.197 atatat 1572: sysctl_createv(clog, 0, NULL, NULL,
1573: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1574: CTLTYPE_INT, "grettl",
1575: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1576: NULL, 0, &ip_gre_ttl, 0,
1577: CTL_NET, PF_INET, IPPROTO_IP,
1578: IPCTL_GRE_TTL, CTL_EOL);
1579: #endif /* NGRE */
1.197 atatat 1580: sysctl_createv(clog, 0, NULL, NULL,
1581: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1582: CTLTYPE_INT, "checkinterface",
1583: SYSCTL_DESCR("Enable receive side of Strong ES model "
1584: "from RFC1122"),
1.189 atatat 1585: NULL, 0, &ip_checkinterface, 0,
1586: CTL_NET, PF_INET, IPPROTO_IP,
1587: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1588: sysctl_createv(clog, 0, NULL, NULL,
1589: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1590: CTLTYPE_INT, "random_id",
1591: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1592: NULL, 0, &ip_do_randomid, 0,
1593: CTL_NET, PF_INET, IPPROTO_IP,
1594: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1595: sysctl_createv(clog, 0, NULL, NULL,
1596: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1597: CTLTYPE_INT, "do_loopback_cksum",
1598: SYSCTL_DESCR("Perform IP checksum on loopback"),
1599: NULL, 0, &ip_do_loopback_cksum, 0,
1600: CTL_NET, PF_INET, IPPROTO_IP,
1601: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1602: sysctl_createv(clog, 0, NULL, NULL,
1603: CTLFLAG_PERMANENT,
1604: CTLTYPE_STRUCT, "stats",
1605: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1606: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1607: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1608: CTL_EOL);
1.301 christos 1609:
1610: /* anonportalgo RFC6056 subtree */
1.302 christos 1611: const struct sysctlnode *portalgo_node;
1612: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1613: CTLFLAG_PERMANENT,
1614: CTLTYPE_NODE, "anonportalgo",
1615: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1616: NULL, 0, NULL, 0,
1617: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1618: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1619: CTLFLAG_PERMANENT,
1620: CTLTYPE_STRING, "available",
1621: SYSCTL_DESCR("available algorithms"),
1.302 christos 1622: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1623: CTL_CREATE, CTL_EOL);
1.302 christos 1624: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1625: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1626: CTLTYPE_STRING, "selected",
1627: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1628: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1629: CTL_CREATE, CTL_EOL);
1630: sysctl_createv(clog, 0, &portalgo_node, NULL,
1631: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1632: CTLTYPE_STRUCT, "reserve",
1633: SYSCTL_DESCR("bitmap of reserved ports"),
1634: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1635: CTL_CREATE, CTL_EOL);
1.1 cgd 1636: }
1.266 thorpej 1637:
1638: void
1639: ip_statinc(u_int stat)
1640: {
1641:
1642: KASSERT(stat < IP_NSTATS);
1643: IP_STATINC(stat);
1644: }
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