Annotation of src/sys/netinet/ip_input.c, Revision 1.321
1.321 ! roy 1: /* $NetBSD: ip_input.c,v 1.320 2015/03/26 04:05:58 ozaki-r 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>
1.321 ! roy 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.320 2015/03/26 04:05:58 ozaki-r 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>
1.318 rmind 106: #include <sys/cpu.h>
1.5 mycroft 107: #include <sys/mbuf.h>
108: #include <sys/domain.h>
109: #include <sys/protosw.h>
110: #include <sys/socket.h>
1.44 thorpej 111: #include <sys/socketvar.h>
1.5 mycroft 112: #include <sys/errno.h>
113: #include <sys/time.h>
114: #include <sys/kernel.h>
1.72 thorpej 115: #include <sys/pool.h>
1.28 christos 116: #include <sys/sysctl.h>
1.230 elad 117: #include <sys/kauth.h>
1.1 cgd 118:
1.5 mycroft 119: #include <net/if.h>
1.44 thorpej 120: #include <net/if_dl.h>
1.5 mycroft 121: #include <net/route.h>
1.318 rmind 122: #include <net/pktqueue.h>
1.45 mrg 123: #include <net/pfil.h>
1.1 cgd 124:
1.5 mycroft 125: #include <netinet/in.h>
126: #include <netinet/in_systm.h>
127: #include <netinet/ip.h>
128: #include <netinet/in_pcb.h>
1.215 yamt 129: #include <netinet/in_proto.h>
1.5 mycroft 130: #include <netinet/in_var.h>
131: #include <netinet/ip_var.h>
1.266 thorpej 132: #include <netinet/ip_private.h>
1.5 mycroft 133: #include <netinet/ip_icmp.h>
1.89 itojun 134: /* just for gif_ttl */
135: #include <netinet/in_gif.h>
136: #include "gif.h"
1.144 martin 137: #include <net/if_gre.h>
138: #include "gre.h"
1.111 jdolecek 139:
140: #ifdef MROUTING
141: #include <netinet/ip_mroute.h>
142: #endif
1.302 christos 143: #include <netinet/portalgo.h>
1.89 itojun 144:
1.304 christos 145: #ifdef IPSEC
1.173 jonathan 146: #include <netipsec/ipsec.h>
1.305 rmind 147: #endif
1.44 thorpej 148:
1.1 cgd 149: #ifndef IPFORWARDING
150: #ifdef GATEWAY
151: #define IPFORWARDING 1 /* forward IP packets not for us */
152: #else /* GATEWAY */
153: #define IPFORWARDING 0 /* don't forward IP packets not for us */
154: #endif /* GATEWAY */
155: #endif /* IPFORWARDING */
156: #ifndef IPSENDREDIRECTS
157: #define IPSENDREDIRECTS 1
158: #endif
1.26 thorpej 159: #ifndef IPFORWSRCRT
1.47 cjs 160: #define IPFORWSRCRT 1 /* forward source-routed packets */
161: #endif
162: #ifndef IPALLOWSRCRT
1.48 mrg 163: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 164: #endif
1.53 kml 165: #ifndef IPMTUDISC
1.153 itojun 166: #define IPMTUDISC 1
1.53 kml 167: #endif
1.60 kml 168: #ifndef IPMTUDISCTIMEOUT
1.61 kml 169: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 170: #endif
1.53 kml 171:
1.278 christos 172: #ifdef COMPAT_50
173: #include <compat/sys/time.h>
174: #include <compat/sys/socket.h>
175: #endif
176:
1.27 thorpej 177: /*
178: * Note: DIRECTED_BROADCAST is handled this way so that previous
179: * configuration using this option will Just Work.
180: */
181: #ifndef IPDIRECTEDBCAST
182: #ifdef DIRECTED_BROADCAST
183: #define IPDIRECTEDBCAST 1
184: #else
185: #define IPDIRECTEDBCAST 0
186: #endif /* DIRECTED_BROADCAST */
187: #endif /* IPDIRECTEDBCAST */
1.1 cgd 188: int ipforwarding = IPFORWARDING;
189: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 190: int ip_defttl = IPDEFTTL;
1.26 thorpej 191: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 192: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 193: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 194: int ip_mtudisc = IPMTUDISC;
1.156 itojun 195: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 196: #ifdef DIAGNOSTIC
197: int ipprintfs = 0;
198: #endif
1.184 jonathan 199:
200: int ip_do_randomid = 0;
201:
1.165 christos 202: /*
203: * XXX - Setting ip_checkinterface mostly implements the receive side of
204: * the Strong ES model described in RFC 1122, but since the routing table
205: * and transmit implementation do not implement the Strong ES model,
206: * setting this to 1 results in an odd hybrid.
207: *
208: * XXX - ip_checkinterface currently must be disabled if you use ipnat
209: * to translate the destination address to another local interface.
210: *
211: * XXX - ip_checkinterface must be disabled if you add IP aliases
212: * to the loopback interface instead of the interface where the
213: * packets for those addresses are received.
214: */
1.318 rmind 215: static int ip_checkinterface __read_mostly = 0;
1.165 christos 216:
1.60 kml 217: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
218:
1.318 rmind 219: pktqueue_t * ip_pktq __read_mostly;
220: pfil_head_t * inet_pfil_hook __read_mostly;
221: ipid_state_t * ip_ids __read_mostly;
222: percpu_t * ipstat_percpu __read_mostly;
223:
224: static struct route ipforward_rt __cacheline_aligned;
1.286 tls 225:
1.183 jonathan 226: uint16_t ip_id;
1.75 thorpej 227:
1.135 thorpej 228: #ifdef INET_CSUM_COUNTERS
229: #include <sys/device.h>
230:
231: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
232: NULL, "inet", "hwcsum bad");
233: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
234: NULL, "inet", "hwcsum ok");
235: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
236: NULL, "inet", "swcsum");
237:
238: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
239:
1.201 matt 240: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
241: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
242: EVCNT_ATTACH_STATIC(ip_swcsum);
243:
1.135 thorpej 244: #else
245:
246: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
247:
248: #endif /* INET_CSUM_COUNTERS */
249:
1.1 cgd 250: /*
251: * We need to save the IP options in case a protocol wants to respond
252: * to an incoming packet over the same route if the packet got here
253: * using IP source routing. This allows connection establishment and
254: * maintenance when the remote end is on a network that is not known
255: * to us.
256: */
1.311 rmind 257:
258: static int ip_nhops = 0;
259:
1.1 cgd 260: static struct ip_srcrt {
261: struct in_addr dst; /* final destination */
262: char nop; /* one NOP to align */
263: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
264: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
265: } ip_srcrt;
266:
1.295 dyoung 267: static int ip_drainwanted;
268:
1.318 rmind 269: struct sockaddr_in ipaddr = {
270: .sin_len = sizeof(ipaddr),
271: .sin_family = AF_INET,
272: };
273:
1.210 perry 274: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 275:
1.164 matt 276: #ifdef MBUFTRACE
1.234 dogcow 277: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
278: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 279: #endif
280:
1.318 rmind 281: static void ipintr(void *);
1.312 rmind 282: static void ip_input(struct mbuf *);
1.313 rmind 283: static void ip_forward(struct mbuf *, int);
1.311 rmind 284: static bool ip_dooptions(struct mbuf *);
285: static struct in_ifaddr *ip_rtaddr(struct in_addr);
286: static void sysctl_net_inet_ip_setup(struct sysctllog **);
1.284 pooka 287:
1.318 rmind 288: /* XXX: Not yet enabled. */
289: #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
290: #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
291:
1.1 cgd 292: /*
293: * IP initialization: fill in IP protocol switch table.
294: * All protocols not implemented in kernel go to raw IP protocol handler.
295: */
1.8 mycroft 296: void
1.211 perry 297: ip_init(void)
1.1 cgd 298: {
1.199 matt 299: const struct protosw *pr;
1.1 cgd 300:
1.311 rmind 301: in_init();
1.284 pooka 302: sysctl_net_inet_ip_setup(NULL);
303:
1.311 rmind 304: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
305: KASSERT(pr != NULL);
1.275 pooka 306:
1.319 ozaki-r 307: ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318 rmind 308: KASSERT(ip_pktq != NULL);
309:
1.311 rmind 310: for (u_int i = 0; i < IPPROTO_MAX; i++) {
1.1 cgd 311: ip_protox[i] = pr - inetsw;
1.311 rmind 312: }
1.1 cgd 313: for (pr = inetdomain.dom_protosw;
314: pr < inetdomain.dom_protoswNPROTOSW; pr++)
315: if (pr->pr_domain->dom_family == PF_INET &&
316: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
317: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 318:
1.288 rmind 319: ip_reass_init();
1.190 jonathan 320:
1.291 rmind 321: ip_ids = ip_id_init();
1.227 kardel 322: ip_id = time_second & 0xfffff;
1.194 jonathan 323:
1.160 itojun 324: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 325: #ifdef GATEWAY
1.311 rmind 326: ipflow_init();
1.73 thorpej 327: #endif
1.121 thorpej 328:
329: /* Register our Packet Filter hook. */
1.308 rmind 330: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
331: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 332:
1.164 matt 333: #ifdef MBUFTRACE
334: MOWNER_ATTACH(&ip_tx_mowner);
335: MOWNER_ATTACH(&ip_rx_mowner);
336: #endif /* MBUFTRACE */
1.266 thorpej 337:
338: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 339: }
340:
341: /*
1.318 rmind 342: * IP software interrupt routine.
1.89 itojun 343: */
1.318 rmind 344: static void
345: ipintr(void *arg __unused)
1.89 itojun 346: {
347: struct mbuf *m;
1.286 tls 348:
1.318 rmind 349: KASSERT(cpu_softintr_p());
1.89 itojun 350:
1.268 ad 351: mutex_enter(softnet_lock);
1.318 rmind 352: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 353: ip_input(m);
354: }
1.268 ad 355: mutex_exit(softnet_lock);
1.89 itojun 356: }
357:
358: /*
1.318 rmind 359: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 360: * try to reassemble. Process options. Pass to next level.
361: */
1.312 rmind 362: static void
1.89 itojun 363: ip_input(struct mbuf *m)
1.1 cgd 364: {
1.109 augustss 365: struct ip *ip = NULL;
366: struct in_ifaddr *ia;
367: struct ifaddr *ifa;
1.288 rmind 368: int hlen = 0, len;
1.100 itojun 369: int downmatch;
1.165 christos 370: int checkif;
1.169 itojun 371: int srcrt = 0;
1.314 rmind 372: ifnet_t *ifp;
1.1 cgd 373:
1.318 rmind 374: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
375: "interrupt handler; synchronization assumptions violated");
376:
1.164 matt 377: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 378: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.314 rmind 379: ifp = m->m_pkthdr.rcvif;
1.164 matt 380:
1.1 cgd 381: /*
382: * If no IP addresses have been set yet but the interfaces
383: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 384: * Note: we pre-check without locks held.
1.1 cgd 385: */
1.318 rmind 386: if (!TAILQ_FIRST(&in_ifaddrhead)) {
1.1 cgd 387: goto bad;
1.318 rmind 388: }
1.266 thorpej 389: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 390:
1.154 thorpej 391: /*
392: * If the IP header is not aligned, slurp it up into a new
393: * mbuf with space for link headers, in the event we forward
394: * it. Otherwise, if it is aligned, make sure the entire
395: * base IP header is in the first mbuf of the chain.
396: */
1.244 christos 397: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 398: if ((m = m_copyup(m, sizeof(struct ip),
399: (max_linkhdr + 3) & ~3)) == NULL) {
400: /* XXXJRT new stat, please */
1.266 thorpej 401: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 402: return;
403: }
404: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
405: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 406: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 407: return;
408: }
1.1 cgd 409: }
410: ip = mtod(m, struct ip *);
1.13 mycroft 411: if (ip->ip_v != IPVERSION) {
1.266 thorpej 412: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 413: goto bad;
414: }
1.1 cgd 415: hlen = ip->ip_hl << 2;
416: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 417: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 418: goto bad;
419: }
420: if (hlen > m->m_len) {
1.298 liamjfoy 421: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 422: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 423: return;
1.1 cgd 424: }
425: ip = mtod(m, struct ip *);
426: }
1.98 thorpej 427:
1.85 hwr 428: /*
1.99 thorpej 429: * RFC1122: packets with a multicast source address are
1.98 thorpej 430: * not allowed.
1.85 hwr 431: */
432: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 433: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 434: goto bad;
1.129 itojun 435: }
436:
437: /* 127/8 must not appear on wire - RFC1122 */
438: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
439: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314 rmind 440: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 441: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 442: goto bad;
1.130 itojun 443: }
1.85 hwr 444: }
445:
1.135 thorpej 446: switch (m->m_pkthdr.csum_flags &
1.314 rmind 447: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 448: M_CSUM_IPv4_BAD)) {
449: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
450: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
451: goto badcsum;
452:
453: case M_CSUM_IPv4:
454: /* Checksum was okay. */
455: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
456: break;
457:
458: default:
1.206 thorpej 459: /*
460: * Must compute it ourselves. Maybe skip checksum on
461: * loopback interfaces.
462: */
1.314 rmind 463: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
464: ip_do_loopback_cksum)) {
1.206 thorpej 465: INET_CSUM_COUNTER_INCR(&ip_swcsum);
466: if (in_cksum(m, hlen) != 0)
467: goto badcsum;
468: }
1.135 thorpej 469: break;
1.1 cgd 470: }
471:
1.121 thorpej 472: /* Retrieve the packet length. */
473: len = ntohs(ip->ip_len);
1.81 proff 474:
475: /*
476: * Check for additional length bogosity
477: */
1.84 proff 478: if (len < hlen) {
1.266 thorpej 479: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 480: goto bad;
481: }
1.1 cgd 482:
483: /*
484: * Check that the amount of data in the buffers
485: * is as at least much as the IP header would have us expect.
486: * Trim mbufs if longer than we expect.
487: * Drop packet if shorter than we expect.
488: */
1.35 mycroft 489: if (m->m_pkthdr.len < len) {
1.266 thorpej 490: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 491: goto bad;
492: }
1.35 mycroft 493: if (m->m_pkthdr.len > len) {
1.1 cgd 494: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 495: m->m_len = len;
496: m->m_pkthdr.len = len;
1.1 cgd 497: } else
1.35 mycroft 498: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 499: }
500:
1.64 thorpej 501: /*
502: * Assume that we can create a fast-forward IP flow entry
503: * based on this packet.
504: */
505: m->m_flags |= M_CANFASTFWD;
506:
1.33 mrg 507: /*
1.64 thorpej 508: * Run through list of hooks for input packets. If there are any
509: * filters which require that additional packets in the flow are
510: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
511: * Note that filters must _never_ set this flag, as another filter
512: * in the list may have previously cleared it.
1.33 mrg 513: */
1.304 christos 514: #if defined(IPSEC)
1.317 christos 515: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 516: #else
517: if (1)
518: #endif
519: {
1.314 rmind 520: struct in_addr odst = ip->ip_dst;
1.318 rmind 521: bool freed;
1.169 itojun 522:
1.318 rmind 523: SOFTNET_LOCK();
524: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
525: SOFTNET_UNLOCK();
526: if (freed || m == NULL) {
1.127 itojun 527: return;
1.318 rmind 528: }
1.127 itojun 529: ip = mtod(m, struct ip *);
1.142 darrenr 530: hlen = ip->ip_hl << 2;
1.318 rmind 531:
1.205 darrenr 532: /*
533: * XXX The setting of "srcrt" here is to prevent ip_forward()
534: * from generating ICMP redirects for packets that have
535: * been redirected by a hook back out on to the same LAN that
536: * they came from and is not an indication that the packet
537: * is being inffluenced by source routing options. This
538: * allows things like
539: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
540: * where tlp0 is both on the 1.1.1.0/24 network and is the
541: * default route for hosts on 1.1.1.0/24. Of course this
542: * also requires a "map tlp0 ..." to complete the story.
543: * One might argue whether or not this kind of network config.
1.212 perry 544: * should be supported in this manner...
1.205 darrenr 545: */
1.169 itojun 546: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 547: }
1.123 thorpej 548:
549: #ifdef ALTQ
550: /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318 rmind 551: if (altq_input) {
552: SOFTNET_LOCK();
553: if ((*altq_input)(m, AF_INET) == 0) {
554: /* Packet dropped by traffic conditioner. */
555: SOFTNET_UNLOCK();
556: return;
557: }
558: SOFTNET_UNLOCK();
1.123 thorpej 559: }
560: #endif
1.121 thorpej 561:
562: /*
1.1 cgd 563: * Process options and, if not destined for us,
564: * ship it on. ip_dooptions returns 1 when an
565: * error was detected (causing an icmp message
566: * to be sent and the original packet to be freed).
567: */
568: ip_nhops = 0; /* for source routed packets */
569: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 570: return;
1.1 cgd 571:
572: /*
1.165 christos 573: * Enable a consistency check between the destination address
574: * and the arrival interface for a unicast packet (the RFC 1122
575: * strong ES model) if IP forwarding is disabled and the packet
576: * is not locally generated.
577: *
578: * XXX - Checking also should be disabled if the destination
579: * address is ipnat'ed to a different interface.
580: *
581: * XXX - Checking is incompatible with IP aliases added
582: * to the loopback interface instead of the interface where
583: * the packets are received.
584: *
585: * XXX - We need to add a per ifaddr flag for this so that
586: * we get finer grain control.
587: */
588: checkif = ip_checkinterface && (ipforwarding == 0) &&
1.315 christos 589: (ifp->if_flags & IFF_LOOPBACK) == 0;
1.165 christos 590:
591: /*
1.1 cgd 592: * Check our list of addresses, to see if the packet is for us.
1.100 itojun 593: *
594: * Traditional 4.4BSD did not consult IFF_UP at all.
595: * The behavior here is to treat addresses on !IFF_UP interface
1.321 ! roy 596: * or IN_IFF_NOTREADY addresses as not mine.
1.1 cgd 597: */
1.100 itojun 598: downmatch = 0;
1.140 matt 599: LIST_FOREACH(ia, &IN_IFADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
1.97 itojun 600: if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
1.321 ! roy 601: if (ia->ia4_flags & IN_IFF_NOTREADY)
! 602: continue;
1.314 rmind 603: if (checkif && ia->ia_ifp != ifp)
1.165 christos 604: continue;
1.97 itojun 605: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
606: break;
1.100 itojun 607: else
608: downmatch++;
1.97 itojun 609: }
610: }
1.86 thorpej 611: if (ia != NULL)
612: goto ours;
1.315 christos 613: if (ifp->if_flags & IFF_BROADCAST) {
1.314 rmind 614: IFADDR_FOREACH(ifa, ifp) {
1.140 matt 615: if (ifa->ifa_addr->sa_family != AF_INET)
616: continue;
1.57 tls 617: ia = ifatoia(ifa);
1.321 ! roy 618: if (ia->ia4_flags & IN_IFF_NOTREADY)
! 619: continue;
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: #ifdef MROUTING
639: extern struct socket *ip_mrouter;
1.10 brezak 640:
1.4 hpeyerl 641: if (ip_mrouter) {
642: /*
643: * If we are acting as a multicast router, all
644: * incoming multicast packets are passed to the
645: * kernel-level multicast forwarding function.
646: * The packet is returned (relatively) intact; if
647: * ip_mforward() returns a non-zero value, the packet
648: * must be discarded, else it may be accepted below.
649: *
650: * (The IP ident field is put in the same byte order
651: * as expected when ip_mforward() is called from
652: * ip_output().)
653: */
1.318 rmind 654: SOFTNET_LOCK();
1.314 rmind 655: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 656: SOFTNET_UNLOCK();
1.266 thorpej 657: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 658: m_freem(m);
1.89 itojun 659: return;
1.4 hpeyerl 660: }
1.318 rmind 661: SOFTNET_UNLOCK();
1.4 hpeyerl 662:
663: /*
664: * The process-level routing demon needs to receive
665: * all multicast IGMP packets, whether or not this
666: * host belongs to their destination groups.
667: */
1.318 rmind 668: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 669: goto ours;
1.318 rmind 670: }
1.266 thorpej 671: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 672: }
673: #endif
674: /*
675: * See if we belong to the destination multicast group on the
676: * arrival interface.
677: */
1.316 rmind 678: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 679: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 680: m_freem(m);
1.89 itojun 681: return;
1.4 hpeyerl 682: }
683: goto ours;
684: }
1.19 mycroft 685: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 686: in_nullhost(ip->ip_dst))
1.1 cgd 687: goto ours;
688:
689: /*
690: * Not for us; forward if possible and desirable.
691: */
692: if (ipforwarding == 0) {
1.266 thorpej 693: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 694: m_freem(m);
1.100 itojun 695: } else {
696: /*
697: * If ip_dst matched any of my address on !IFF_UP interface,
698: * and there's no IFF_UP interface that matches ip_dst,
699: * send icmp unreach. Forwarding it will result in in-kernel
700: * forwarding loop till TTL goes to 0.
701: */
702: if (downmatch) {
703: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 704: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 705: return;
706: }
1.304 christos 707: #ifdef IPSEC
1.305 rmind 708: /* Perform IPsec, if any. */
1.318 rmind 709: if (ipsec_used) {
710: SOFTNET_LOCK();
711: if (ipsec4_input(m, IP_FORWARDING |
712: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
713: SOFTNET_UNLOCK();
714: goto bad;
715: }
716: SOFTNET_UNLOCK();
1.173 jonathan 717: }
1.305 rmind 718: #endif
1.169 itojun 719: ip_forward(m, srcrt);
1.100 itojun 720: }
1.89 itojun 721: return;
1.1 cgd 722:
723: ours:
724: /*
725: * If offset or IP_MF are set, must reassemble.
726: */
1.155 itojun 727: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 728: /*
729: * Pass to IP reassembly mechanism.
730: */
1.290 rmind 731: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 732: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 733: goto bad;
1.16 cgd 734: }
1.290 rmind 735: if (m == NULL) {
1.289 rmind 736: /* More fragments should come; silently return. */
737: return;
738: }
1.290 rmind 739: /*
740: * Reassembly is done, we have the final packet.
741: * Updated cached data in local variable(s).
742: */
1.289 rmind 743: ip = mtod(m, struct ip *);
744: hlen = ip->ip_hl << 2;
1.79 mycroft 745: }
1.128 itojun 746:
1.304 christos 747: #ifdef IPSEC
1.173 jonathan 748: /*
1.305 rmind 749: * Enforce IPsec policy checking if we are seeing last header.
750: * Note that we do not visit this with protocols with PCB layer
751: * code - like UDP/TCP/raw IP.
1.173 jonathan 752: */
1.317 christos 753: if (ipsec_used &&
754: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318 rmind 755: SOFTNET_LOCK();
1.305 rmind 756: if (ipsec4_input(m, 0) != 0) {
1.318 rmind 757: SOFTNET_UNLOCK();
1.305 rmind 758: goto bad;
1.173 jonathan 759: }
1.318 rmind 760: SOFTNET_UNLOCK();
1.173 jonathan 761: }
1.305 rmind 762: #endif
1.1 cgd 763:
764: /*
765: * Switch out to protocol's input routine.
766: */
1.82 aidan 767: #if IFA_STATS
1.122 itojun 768: if (ia && ip)
1.155 itojun 769: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 770: #endif
1.266 thorpej 771: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 772:
1.318 rmind 773: const int off = hlen, nh = ip->ip_p;
774:
775: SOFTNET_LOCK();
1.89 itojun 776: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318 rmind 777: SOFTNET_UNLOCK();
1.89 itojun 778: return;
1.1 cgd 779: bad:
780: m_freem(m);
1.135 thorpej 781: return;
782:
783: badcsum:
1.266 thorpej 784: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 785: m_freem(m);
1.1 cgd 786: }
787:
788: /*
1.288 rmind 789: * IP timer processing.
1.1 cgd 790: */
1.8 mycroft 791: void
1.211 perry 792: ip_slowtimo(void)
1.1 cgd 793: {
1.268 ad 794:
795: mutex_enter(softnet_lock);
796: KERNEL_LOCK(1, NULL);
1.1 cgd 797:
1.288 rmind 798: ip_reass_slowtimo();
1.268 ad 799:
800: KERNEL_UNLOCK_ONE(NULL);
801: mutex_exit(softnet_lock);
1.1 cgd 802: }
803:
804: /*
1.288 rmind 805: * IP drain processing.
1.1 cgd 806: */
1.8 mycroft 807: void
1.211 perry 808: ip_drain(void)
1.1 cgd 809: {
810:
1.268 ad 811: KERNEL_LOCK(1, NULL);
1.288 rmind 812: ip_reass_drain();
1.268 ad 813: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 814: }
815:
816: /*
1.311 rmind 817: * ip_dooptions: perform option processing on a datagram, possibly discarding
818: * it if bad options are encountered, or forwarding it if source-routed.
819: *
820: * => Returns true if packet has been forwarded/freed.
821: * => Returns false if the packet should be processed further.
1.1 cgd 822: */
1.311 rmind 823: static bool
1.211 perry 824: ip_dooptions(struct mbuf *m)
1.1 cgd 825: {
1.109 augustss 826: struct ip *ip = mtod(m, struct ip *);
827: u_char *cp, *cp0;
828: struct ip_timestamp *ipt;
829: struct in_ifaddr *ia;
1.1 cgd 830: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 831: struct in_addr dst;
1.1 cgd 832: n_time ntime;
833:
1.13 mycroft 834: dst = ip->ip_dst;
1.1 cgd 835: cp = (u_char *)(ip + 1);
836: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
837: for (; cnt > 0; cnt -= optlen, cp += optlen) {
838: opt = cp[IPOPT_OPTVAL];
839: if (opt == IPOPT_EOL)
840: break;
841: if (opt == IPOPT_NOP)
842: optlen = 1;
843: else {
1.113 itojun 844: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
845: code = &cp[IPOPT_OLEN] - (u_char *)ip;
846: goto bad;
847: }
1.1 cgd 848: optlen = cp[IPOPT_OLEN];
1.114 itojun 849: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 850: code = &cp[IPOPT_OLEN] - (u_char *)ip;
851: goto bad;
852: }
853: }
854: switch (opt) {
855:
856: default:
857: break;
858:
859: /*
860: * Source routing with record.
861: * Find interface with current destination address.
862: * If none on this machine then drop if strictly routed,
863: * or do nothing if loosely routed.
864: * Record interface address and bring up next address
865: * component. If strictly routed make sure next
866: * address is on directly accessible net.
867: */
868: case IPOPT_LSRR:
869: case IPOPT_SSRR:
1.47 cjs 870: if (ip_allowsrcrt == 0) {
871: type = ICMP_UNREACH;
872: code = ICMP_UNREACH_NET_PROHIB;
873: goto bad;
874: }
1.114 itojun 875: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
876: code = &cp[IPOPT_OLEN] - (u_char *)ip;
877: goto bad;
878: }
1.1 cgd 879: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
880: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
881: goto bad;
882: }
883: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 884: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 885: if (ia == 0) {
886: if (opt == IPOPT_SSRR) {
887: type = ICMP_UNREACH;
888: code = ICMP_UNREACH_SRCFAIL;
889: goto bad;
890: }
891: /*
892: * Loose routing, and not at next destination
893: * yet; nothing to do except forward.
894: */
895: break;
896: }
897: off--; /* 0 origin */
1.112 sommerfe 898: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 899: /*
900: * End of source route. Should be for us.
901: */
902: save_rte(cp, ip->ip_src);
903: break;
904: }
905: /*
906: * locate outgoing interface
907: */
1.281 tsutsui 908: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 909: sizeof(ipaddr.sin_addr));
1.96 thorpej 910: if (opt == IPOPT_SSRR)
1.196 itojun 911: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 912: else
1.1 cgd 913: ia = ip_rtaddr(ipaddr.sin_addr);
914: if (ia == 0) {
915: type = ICMP_UNREACH;
916: code = ICMP_UNREACH_SRCFAIL;
917: goto bad;
918: }
919: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 920: bcopy((void *)&ia->ia_addr.sin_addr,
921: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 922: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 923: /*
924: * Let ip_intr's mcast routing check handle mcast pkts
925: */
1.18 mycroft 926: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 927: break;
928:
929: case IPOPT_RR:
1.114 itojun 930: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
931: code = &cp[IPOPT_OLEN] - (u_char *)ip;
932: goto bad;
933: }
1.1 cgd 934: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
935: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
936: goto bad;
937: }
938: /*
939: * If no space remains, ignore.
940: */
941: off--; /* 0 origin */
1.112 sommerfe 942: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 943: break;
1.281 tsutsui 944: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 945: sizeof(ipaddr.sin_addr));
946: /*
947: * locate outgoing interface; if we're the destination,
948: * use the incoming interface (should be same).
949: */
1.96 thorpej 950: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
951: == NULL &&
952: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 953: type = ICMP_UNREACH;
954: code = ICMP_UNREACH_HOST;
955: goto bad;
956: }
1.244 christos 957: bcopy((void *)&ia->ia_addr.sin_addr,
958: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 959: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
960: break;
961:
962: case IPOPT_TS:
963: code = cp - (u_char *)ip;
964: ipt = (struct ip_timestamp *)cp;
1.114 itojun 965: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
966: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 967: goto bad;
1.114 itojun 968: }
969: if (ipt->ipt_ptr < 5) {
970: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
971: goto bad;
972: }
1.15 cgd 973: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 974: if (++ipt->ipt_oflw == 0) {
975: code = (u_char *)&ipt->ipt_ptr -
976: (u_char *)ip;
1.1 cgd 977: goto bad;
1.114 itojun 978: }
1.1 cgd 979: break;
980: }
1.104 thorpej 981: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 982: switch (ipt->ipt_flg) {
983:
984: case IPOPT_TS_TSONLY:
985: break;
986:
987: case IPOPT_TS_TSANDADDR:
1.66 thorpej 988: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 989: sizeof(struct in_addr) > ipt->ipt_len) {
990: code = (u_char *)&ipt->ipt_ptr -
991: (u_char *)ip;
1.1 cgd 992: goto bad;
1.114 itojun 993: }
1.13 mycroft 994: ipaddr.sin_addr = dst;
1.96 thorpej 995: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
996: m->m_pkthdr.rcvif));
1.13 mycroft 997: if (ia == 0)
998: continue;
1.104 thorpej 999: bcopy(&ia->ia_addr.sin_addr,
1000: cp0, sizeof(struct in_addr));
1.1 cgd 1001: ipt->ipt_ptr += sizeof(struct in_addr);
1002: break;
1003:
1004: case IPOPT_TS_PRESPEC:
1.66 thorpej 1005: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1006: sizeof(struct in_addr) > ipt->ipt_len) {
1007: code = (u_char *)&ipt->ipt_ptr -
1008: (u_char *)ip;
1.1 cgd 1009: goto bad;
1.114 itojun 1010: }
1.281 tsutsui 1011: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1012: sizeof(struct in_addr));
1.96 thorpej 1013: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1014: == NULL)
1.1 cgd 1015: continue;
1016: ipt->ipt_ptr += sizeof(struct in_addr);
1017: break;
1018:
1019: default:
1.114 itojun 1020: /* XXX can't take &ipt->ipt_flg */
1021: code = (u_char *)&ipt->ipt_ptr -
1022: (u_char *)ip + 1;
1.1 cgd 1023: goto bad;
1024: }
1025: ntime = iptime();
1.107 thorpej 1026: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1027: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1028: sizeof(n_time));
1029: ipt->ipt_ptr += sizeof(n_time);
1030: }
1031: }
1032: if (forward) {
1.26 thorpej 1033: if (ip_forwsrcrt == 0) {
1034: type = ICMP_UNREACH;
1035: code = ICMP_UNREACH_SRCFAIL;
1036: goto bad;
1037: }
1.1 cgd 1038: ip_forward(m, 1);
1.311 rmind 1039: return true;
1.13 mycroft 1040: }
1.311 rmind 1041: return false;
1.1 cgd 1042: bad:
1.13 mycroft 1043: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1044: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1045: return true;
1.1 cgd 1046: }
1047:
1048: /*
1.311 rmind 1049: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1050: * return internet address info of interface to be used to get there.
1051: */
1.311 rmind 1052: static struct in_ifaddr *
1.211 perry 1053: ip_rtaddr(struct in_addr dst)
1.1 cgd 1054: {
1.249 dyoung 1055: struct rtentry *rt;
1056: union {
1057: struct sockaddr dst;
1058: struct sockaddr_in dst4;
1059: } u;
1060:
1061: sockaddr_in_init(&u.dst4, &dst, 0);
1062:
1.318 rmind 1063: SOFTNET_LOCK();
1064: rt = rtcache_lookup(&ipforward_rt, &u.dst);
1065: SOFTNET_UNLOCK();
1066: if (rt == NULL)
1.249 dyoung 1067: return NULL;
1068:
1069: return ifatoia(rt->rt_ifa);
1.1 cgd 1070: }
1071:
1072: /*
1.311 rmind 1073: * save_rte: save incoming source route for use in replies, to be picked
1074: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1075: */
1.311 rmind 1076: static void
1.211 perry 1077: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1078: {
1079: unsigned olen;
1080:
1081: olen = option[IPOPT_OLEN];
1082: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1083: return;
1.281 tsutsui 1084: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1085: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1086: ip_srcrt.dst = dst;
1087: }
1088:
1089: /*
1090: * Retrieve incoming source route for use in replies,
1091: * in the same form used by setsockopt.
1092: * The first hop is placed before the options, will be removed later.
1093: */
1094: struct mbuf *
1.211 perry 1095: ip_srcroute(void)
1.1 cgd 1096: {
1.109 augustss 1097: struct in_addr *p, *q;
1098: struct mbuf *m;
1.1 cgd 1099:
1100: if (ip_nhops == 0)
1.237 dyoung 1101: return NULL;
1.1 cgd 1102: m = m_get(M_DONTWAIT, MT_SOOPTS);
1103: if (m == 0)
1.237 dyoung 1104: return NULL;
1.1 cgd 1105:
1.164 matt 1106: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1107: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1108:
1109: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1110: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1111: OPTSIZ;
1112:
1113: /*
1114: * First save first hop for return route
1115: */
1116: p = &ip_srcrt.route[ip_nhops - 1];
1117: *(mtod(m, struct in_addr *)) = *p--;
1118:
1119: /*
1120: * Copy option fields and padding (nop) to mbuf.
1121: */
1122: ip_srcrt.nop = IPOPT_NOP;
1123: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1124: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1125: OPTSIZ);
1126: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1127: sizeof(struct in_addr) + OPTSIZ);
1128: #undef OPTSIZ
1129: /*
1130: * Record return path as an IP source route,
1131: * reversing the path (pointers are now aligned).
1132: */
1133: while (p >= ip_srcrt.route) {
1134: *q++ = *p--;
1135: }
1136: /*
1137: * Last hop goes to final destination.
1138: */
1139: *q = ip_srcrt.dst;
1140: return (m);
1141: }
1142:
1.139 matt 1143: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1144: [PRC_MSGSIZE] = EMSGSIZE,
1145: [PRC_HOSTDEAD] = EHOSTDOWN,
1146: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1147: [PRC_UNREACH_NET] = EHOSTUNREACH,
1148: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1149: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1150: [PRC_UNREACH_PORT] = ECONNREFUSED,
1151: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1152: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1153: };
1154:
1.295 dyoung 1155: void
1156: ip_fasttimo(void)
1157: {
1158: if (ip_drainwanted) {
1159: ip_drain();
1160: ip_drainwanted = 0;
1161: }
1162: }
1163:
1164: void
1165: ip_drainstub(void)
1166: {
1167: ip_drainwanted = 1;
1168: }
1169:
1.1 cgd 1170: /*
1171: * Forward a packet. If some error occurs return the sender
1172: * an icmp packet. Note we can't always generate a meaningful
1173: * icmp message because icmp doesn't have a large enough repertoire
1174: * of codes and types.
1175: *
1176: * If not forwarding, just drop the packet. This could be confusing
1177: * if ipforwarding was zero but some routing protocol was advancing
1178: * us as a gateway to somewhere. However, we must let the routing
1179: * protocol deal with that.
1180: *
1181: * The srcrt parameter indicates whether the packet is being forwarded
1182: * via a source route.
1183: */
1.313 rmind 1184: static void
1.211 perry 1185: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1186: {
1.109 augustss 1187: struct ip *ip = mtod(m, struct ip *);
1188: struct rtentry *rt;
1.220 christos 1189: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1190: struct mbuf *mcopy;
1.13 mycroft 1191: n_long dest;
1.249 dyoung 1192: union {
1193: struct sockaddr dst;
1194: struct sockaddr_in dst4;
1195: } u;
1.320 ozaki-r 1196: uint64_t *ips;
1.164 matt 1197:
1.318 rmind 1198: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1199: "interrupt handler; synchronization assumptions violated");
1200:
1.164 matt 1201: /*
1202: * We are now in the output path.
1203: */
1204: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1205:
1206: /*
1207: * Clear any in-bound checksum flags for this packet.
1208: */
1209: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1210:
1.13 mycroft 1211: dest = 0;
1.93 sommerfe 1212: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1213: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1214: m_freem(m);
1215: return;
1216: }
1.318 rmind 1217:
1218: SOFTNET_LOCK();
1219:
1.1 cgd 1220: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1221: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318 rmind 1222: SOFTNET_UNLOCK();
1.1 cgd 1223: return;
1224: }
1225:
1.249 dyoung 1226: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1227:
1.249 dyoung 1228: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1229: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318 rmind 1230: SOFTNET_UNLOCK();
1.249 dyoung 1231: return;
1.1 cgd 1232: }
1233:
1234: /*
1.34 mycroft 1235: * Save at most 68 bytes of the packet in case
1.1 cgd 1236: * we need to generate an ICMP message to the src.
1.119 itojun 1237: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1238: */
1.155 itojun 1239: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1240: if (mcopy)
1241: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1242:
1.221 christos 1243: ip->ip_ttl -= IPTTLDEC;
1244:
1.1 cgd 1245: /*
1246: * If forwarding packet using same interface that it came in on,
1247: * perhaps should send a redirect to sender to shortcut a hop.
1248: * Only send redirect if source is sending directly to us,
1249: * and if packet was not source routed (or has any options).
1250: * Also, don't send redirect if forwarding using a default route
1251: * or a route modified by a redirect.
1252: */
1253: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1254: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1255: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1256: ipsendredirects && !srcrt) {
1.19 mycroft 1257: if (rt->rt_ifa &&
1258: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1259: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1260: if (rt->rt_flags & RTF_GATEWAY)
1261: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1262: else
1263: dest = ip->ip_dst.s_addr;
1264: /*
1265: * Router requirements says to only send host
1266: * redirects.
1267: */
1268: type = ICMP_REDIRECT;
1269: code = ICMP_REDIRECT_HOST;
1.1 cgd 1270: }
1271: }
1272:
1.238 dyoung 1273: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1274: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1275: NULL, NULL);
1.173 jonathan 1276:
1.320 ozaki-r 1277: if (error) {
1.266 thorpej 1278: IP_STATINC(IP_STAT_CANTFORWARD);
1.320 ozaki-r 1279: goto error;
1280: }
1281:
1282: ips = IP_STAT_GETREF();
1283: ips[IP_STAT_FORWARD]++;
1284:
1285: if (type) {
1286: ips[IP_STAT_REDIRECTSENT]++;
1287: IP_STAT_PUTREF();
1288: goto redirect;
1289: }
1290:
1291: IP_STAT_PUTREF();
1292: if (mcopy) {
1.63 matt 1293: #ifdef GATEWAY
1.320 ozaki-r 1294: if (mcopy->m_flags & M_CANFASTFWD)
1295: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1296: #endif
1.320 ozaki-r 1297: m_freem(mcopy);
1.1 cgd 1298: }
1.320 ozaki-r 1299:
1300: SOFTNET_UNLOCK();
1301: return;
1302:
1303: redirect:
1304: error:
1.318 rmind 1305: if (mcopy == NULL) {
1306: SOFTNET_UNLOCK();
1.1 cgd 1307: return;
1.318 rmind 1308: }
1.13 mycroft 1309:
1.1 cgd 1310: switch (error) {
1311:
1312: case 0: /* forwarded, but need redirect */
1313: /* type, code set above */
1314: break;
1315:
1316: case ENETUNREACH: /* shouldn't happen, checked above */
1317: case EHOSTUNREACH:
1318: case ENETDOWN:
1319: case EHOSTDOWN:
1320: default:
1321: type = ICMP_UNREACH;
1322: code = ICMP_UNREACH_HOST;
1323: break;
1324:
1325: case EMSGSIZE:
1326: type = ICMP_UNREACH;
1327: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1328:
1.274 seanb 1329: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1330: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1331: #ifdef IPSEC
1.317 christos 1332: if (ipsec_used)
1333: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1334: #endif
1.266 thorpej 1335: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1336: break;
1337:
1338: case ENOBUFS:
1.143 itojun 1339: /*
1.311 rmind 1340: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
1341: * Requirements for IP Version 4 Routers. Source quench can
1342: * big problem under DoS attacks or if the underlying
1343: * interface is rate-limited.
1.143 itojun 1344: */
1345: if (mcopy)
1346: m_freem(mcopy);
1.318 rmind 1347: SOFTNET_UNLOCK();
1.143 itojun 1348: return;
1.1 cgd 1349: }
1.220 christos 1350: icmp_error(mcopy, type, code, dest, destmtu);
1.318 rmind 1351: SOFTNET_UNLOCK();
1.44 thorpej 1352: }
1353:
1354: void
1.211 perry 1355: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1356: struct mbuf *m)
1.44 thorpej 1357: {
1.311 rmind 1358: struct socket *so = inp->inp_socket;
1.314 rmind 1359: ifnet_t *ifp = m->m_pkthdr.rcvif;
1.311 rmind 1360: int inpflags = inp->inp_flags;
1.44 thorpej 1361:
1.311 rmind 1362: if (so->so_options & SO_TIMESTAMP
1.278 christos 1363: #ifdef SO_OTIMESTAMP
1.311 rmind 1364: || so->so_options & SO_OTIMESTAMP
1.278 christos 1365: #endif
1366: ) {
1.44 thorpej 1367: struct timeval tv;
1368:
1369: microtime(&tv);
1.278 christos 1370: #ifdef SO_OTIMESTAMP
1.311 rmind 1371: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1372: struct timeval50 tv50;
1373: timeval_to_timeval50(&tv, &tv50);
1374: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1375: SCM_OTIMESTAMP, SOL_SOCKET);
1376: } else
1377: #endif
1.244 christos 1378: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1379: SCM_TIMESTAMP, SOL_SOCKET);
1380: if (*mp)
1381: mp = &(*mp)->m_next;
1382: }
1.311 rmind 1383: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1384: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1385: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1386: if (*mp)
1387: mp = &(*mp)->m_next;
1388: }
1.311 rmind 1389: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1390: struct in_pktinfo ipi;
1.307 christos 1391: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1392: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1393: *mp = sbcreatecontrol((void *) &ipi,
1394: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1395: if (*mp)
1396: mp = &(*mp)->m_next;
1397: }
1.311 rmind 1398: if (inpflags & INP_PKTINFO) {
1.306 christos 1399: struct in_pktinfo ipi;
1.307 christos 1400: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1401: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1402: *mp = sbcreatecontrol((void *) &ipi,
1403: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1404: if (*mp)
1405: mp = &(*mp)->m_next;
1406: }
1.311 rmind 1407: if (inpflags & INP_RECVIF) {
1.44 thorpej 1408: struct sockaddr_dl sdl;
1409:
1.314 rmind 1410: sockaddr_dl_init(&sdl, sizeof(sdl), ifp ?
1411: ifp->if_index : 0, 0, NULL, 0, NULL, 0);
1.251 dyoung 1412: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1413: if (*mp)
1414: mp = &(*mp)->m_next;
1415: }
1.311 rmind 1416: if (inpflags & INP_RECVTTL) {
1.282 minskim 1417: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1418: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1419: if (*mp)
1420: mp = &(*mp)->m_next;
1421: }
1.13 mycroft 1422: }
1423:
1.189 atatat 1424: /*
1.228 elad 1425: * sysctl helper routine for net.inet.ip.forwsrcrt.
1426: */
1427: static int
1428: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1429: {
1430: int error, tmp;
1431: struct sysctlnode node;
1432:
1433: node = *rnode;
1434: tmp = ip_forwsrcrt;
1435: node.sysctl_data = &tmp;
1436: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1437: if (error || newp == NULL)
1438: return (error);
1439:
1.280 elad 1440: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1441: 0, NULL, NULL, NULL);
1442: if (error)
1443: return (error);
1.228 elad 1444:
1445: ip_forwsrcrt = tmp;
1446:
1447: return (0);
1448: }
1449:
1450: /*
1.189 atatat 1451: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1452: * range of the new value and tweaks timers if it changes.
1453: */
1454: static int
1455: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1456: {
1.189 atatat 1457: int error, tmp;
1458: struct sysctlnode node;
1459:
1460: node = *rnode;
1461: tmp = ip_mtudisc_timeout;
1462: node.sysctl_data = &tmp;
1463: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1464: if (error || newp == NULL)
1465: return (error);
1466: if (tmp < 0)
1467: return (EINVAL);
1.52 thorpej 1468:
1.273 matt 1469: mutex_enter(softnet_lock);
1470:
1.189 atatat 1471: ip_mtudisc_timeout = tmp;
1472: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1473:
1.273 matt 1474: mutex_exit(softnet_lock);
1475:
1.189 atatat 1476: return (0);
1477: }
1.54 lukem 1478:
1.266 thorpej 1479: static int
1480: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1481: {
1482:
1.271 thorpej 1483: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1484: }
1.131 itojun 1485:
1.284 pooka 1486: static void
1487: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1488: {
1.197 atatat 1489: sysctl_createv(clog, 0, NULL, NULL,
1490: CTLFLAG_PERMANENT,
1.203 atatat 1491: CTLTYPE_NODE, "inet",
1492: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1493: NULL, 0, NULL, 0,
1494: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1495: sysctl_createv(clog, 0, NULL, NULL,
1496: CTLFLAG_PERMANENT,
1.203 atatat 1497: CTLTYPE_NODE, "ip",
1498: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1499: NULL, 0, NULL, 0,
1500: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1501:
1.197 atatat 1502: sysctl_createv(clog, 0, NULL, NULL,
1503: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1504: CTLTYPE_INT, "forwarding",
1505: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1506: NULL, 0, &ipforwarding, 0,
1507: CTL_NET, PF_INET, IPPROTO_IP,
1508: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1509: sysctl_createv(clog, 0, NULL, NULL,
1510: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1511: CTLTYPE_INT, "redirect",
1512: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1513: NULL, 0, &ipsendredirects, 0,
1514: CTL_NET, PF_INET, IPPROTO_IP,
1515: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1516: sysctl_createv(clog, 0, NULL, NULL,
1517: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1518: CTLTYPE_INT, "ttl",
1519: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1520: NULL, 0, &ip_defttl, 0,
1521: CTL_NET, PF_INET, IPPROTO_IP,
1522: IPCTL_DEFTTL, CTL_EOL);
1523: #ifdef IPCTL_DEFMTU
1.197 atatat 1524: sysctl_createv(clog, 0, NULL, NULL,
1525: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1526: CTLTYPE_INT, "mtu",
1527: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1528: NULL, 0, &ip_mtu, 0,
1529: CTL_NET, PF_INET, IPPROTO_IP,
1530: IPCTL_DEFMTU, CTL_EOL);
1531: #endif /* IPCTL_DEFMTU */
1.197 atatat 1532: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1533: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1534: CTLTYPE_INT, "forwsrcrt",
1535: SYSCTL_DESCR("Enable forwarding of source-routed "
1536: "datagrams"),
1.228 elad 1537: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1538: CTL_NET, PF_INET, IPPROTO_IP,
1539: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1540: sysctl_createv(clog, 0, NULL, NULL,
1541: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1542: CTLTYPE_INT, "directed-broadcast",
1543: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1544: NULL, 0, &ip_directedbcast, 0,
1545: CTL_NET, PF_INET, IPPROTO_IP,
1546: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1547: sysctl_createv(clog, 0, NULL, NULL,
1548: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1549: CTLTYPE_INT, "allowsrcrt",
1550: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1551: NULL, 0, &ip_allowsrcrt, 0,
1552: CTL_NET, PF_INET, IPPROTO_IP,
1553: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1554:
1.197 atatat 1555: sysctl_createv(clog, 0, NULL, NULL,
1556: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1557: CTLTYPE_INT, "mtudisc",
1558: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1559: NULL, 0, &ip_mtudisc, 0,
1560: CTL_NET, PF_INET, IPPROTO_IP,
1561: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1562: sysctl_createv(clog, 0, NULL, NULL,
1563: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1564: CTLTYPE_INT, "anonportmin",
1565: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1566: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1567: CTL_NET, PF_INET, IPPROTO_IP,
1568: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1569: sysctl_createv(clog, 0, NULL, NULL,
1570: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1571: CTLTYPE_INT, "anonportmax",
1572: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1573: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1574: CTL_NET, PF_INET, IPPROTO_IP,
1575: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1576: sysctl_createv(clog, 0, NULL, NULL,
1577: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1578: CTLTYPE_INT, "mtudisctimeout",
1579: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1580: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1581: CTL_NET, PF_INET, IPPROTO_IP,
1582: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1583: #if NGIF > 0
1.197 atatat 1584: sysctl_createv(clog, 0, NULL, NULL,
1585: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1586: CTLTYPE_INT, "gifttl",
1587: SYSCTL_DESCR("Default TTL for a gif tunnel datagram"),
1.189 atatat 1588: NULL, 0, &ip_gif_ttl, 0,
1589: CTL_NET, PF_INET, IPPROTO_IP,
1590: IPCTL_GIF_TTL, CTL_EOL);
1591: #endif /* NGIF */
1592: #ifndef IPNOPRIVPORTS
1.197 atatat 1593: sysctl_createv(clog, 0, NULL, NULL,
1594: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1595: CTLTYPE_INT, "lowportmin",
1596: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1597: "to assign"),
1.189 atatat 1598: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1599: CTL_NET, PF_INET, IPPROTO_IP,
1600: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1601: sysctl_createv(clog, 0, NULL, NULL,
1602: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1603: CTLTYPE_INT, "lowportmax",
1604: SYSCTL_DESCR("Highest privileged ephemeral port number "
1605: "to assign"),
1.189 atatat 1606: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1607: CTL_NET, PF_INET, IPPROTO_IP,
1608: IPCTL_LOWPORTMAX, CTL_EOL);
1609: #endif /* IPNOPRIVPORTS */
1610: #if NGRE > 0
1.197 atatat 1611: sysctl_createv(clog, 0, NULL, NULL,
1612: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1613: CTLTYPE_INT, "grettl",
1614: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1615: NULL, 0, &ip_gre_ttl, 0,
1616: CTL_NET, PF_INET, IPPROTO_IP,
1617: IPCTL_GRE_TTL, CTL_EOL);
1618: #endif /* NGRE */
1.197 atatat 1619: sysctl_createv(clog, 0, NULL, NULL,
1620: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1621: CTLTYPE_INT, "checkinterface",
1622: SYSCTL_DESCR("Enable receive side of Strong ES model "
1623: "from RFC1122"),
1.189 atatat 1624: NULL, 0, &ip_checkinterface, 0,
1625: CTL_NET, PF_INET, IPPROTO_IP,
1626: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1627: sysctl_createv(clog, 0, NULL, NULL,
1628: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1629: CTLTYPE_INT, "random_id",
1630: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1631: NULL, 0, &ip_do_randomid, 0,
1632: CTL_NET, PF_INET, IPPROTO_IP,
1633: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1634: sysctl_createv(clog, 0, NULL, NULL,
1635: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1636: CTLTYPE_INT, "do_loopback_cksum",
1637: SYSCTL_DESCR("Perform IP checksum on loopback"),
1638: NULL, 0, &ip_do_loopback_cksum, 0,
1639: CTL_NET, PF_INET, IPPROTO_IP,
1640: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1641: sysctl_createv(clog, 0, NULL, NULL,
1642: CTLFLAG_PERMANENT,
1643: CTLTYPE_STRUCT, "stats",
1644: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1645: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1646: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1647: CTL_EOL);
1.321 ! roy 1648: sysctl_createv(clog, 0, NULL, NULL,
! 1649: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
! 1650: CTLTYPE_INT, "dad_count",
! 1651: SYSCTL_DESCR("Number of Duplicate Address Detection "
! 1652: "probes to send"),
! 1653: NULL, 0, &ip_dad_count, 0,
! 1654: CTL_NET, PF_INET, IPPROTO_IP,
! 1655: IPCTL_DAD_COUNT, CTL_EOL);
1.301 christos 1656:
1657: /* anonportalgo RFC6056 subtree */
1.302 christos 1658: const struct sysctlnode *portalgo_node;
1659: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1660: CTLFLAG_PERMANENT,
1661: CTLTYPE_NODE, "anonportalgo",
1662: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1663: NULL, 0, NULL, 0,
1664: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1665: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1666: CTLFLAG_PERMANENT,
1667: CTLTYPE_STRING, "available",
1668: SYSCTL_DESCR("available algorithms"),
1.302 christos 1669: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1670: CTL_CREATE, CTL_EOL);
1.302 christos 1671: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1672: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1673: CTLTYPE_STRING, "selected",
1674: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1675: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1676: CTL_CREATE, CTL_EOL);
1677: sysctl_createv(clog, 0, &portalgo_node, NULL,
1678: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1679: CTLTYPE_STRUCT, "reserve",
1680: SYSCTL_DESCR("bitmap of reserved ports"),
1681: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1682: CTL_CREATE, CTL_EOL);
1.1 cgd 1683: }
1.266 thorpej 1684:
1685: void
1686: ip_statinc(u_int stat)
1687: {
1688:
1689: KASSERT(stat < IP_NSTATS);
1690: IP_STATINC(stat);
1691: }
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