Annotation of src/sys/netinet/ip_input.c, Revision 1.319.4.5
1.319.4.5! skrll 1: /* $NetBSD: ip_input.c,v 1.319.4.4 2015/12/27 12:10:07 skrll 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>
1.319.4.5! skrll 94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.319.4.4 2015/12/27 12:10:07 skrll Exp $");
1.55 scottr 95:
1.319.4.3 skrll 96: #ifdef _KERNEL_OPT
1.184 jonathan 97: #include "opt_inet.h"
1.278 christos 98: #include "opt_compat_netbsd.h"
1.62 matt 99: #include "opt_gateway.h"
1.91 thorpej 100: #include "opt_ipsec.h"
1.55 scottr 101: #include "opt_mrouting.h"
1.167 martin 102: #include "opt_mbuftrace.h"
1.135 thorpej 103: #include "opt_inet_csum.h"
1.319.4.3 skrll 104: #endif
1.1 cgd 105:
1.319.4.4 skrll 106: #include "arp.h"
107:
1.5 mycroft 108: #include <sys/param.h>
109: #include <sys/systm.h>
1.318 rmind 110: #include <sys/cpu.h>
1.5 mycroft 111: #include <sys/mbuf.h>
112: #include <sys/domain.h>
113: #include <sys/protosw.h>
114: #include <sys/socket.h>
1.44 thorpej 115: #include <sys/socketvar.h>
1.5 mycroft 116: #include <sys/errno.h>
117: #include <sys/time.h>
118: #include <sys/kernel.h>
1.72 thorpej 119: #include <sys/pool.h>
1.28 christos 120: #include <sys/sysctl.h>
1.230 elad 121: #include <sys/kauth.h>
1.1 cgd 122:
1.5 mycroft 123: #include <net/if.h>
1.44 thorpej 124: #include <net/if_dl.h>
1.5 mycroft 125: #include <net/route.h>
1.318 rmind 126: #include <net/pktqueue.h>
1.45 mrg 127: #include <net/pfil.h>
1.1 cgd 128:
1.5 mycroft 129: #include <netinet/in.h>
130: #include <netinet/in_systm.h>
131: #include <netinet/ip.h>
132: #include <netinet/in_pcb.h>
1.215 yamt 133: #include <netinet/in_proto.h>
1.5 mycroft 134: #include <netinet/in_var.h>
135: #include <netinet/ip_var.h>
1.266 thorpej 136: #include <netinet/ip_private.h>
1.5 mycroft 137: #include <netinet/ip_icmp.h>
1.89 itojun 138: /* just for gif_ttl */
139: #include <netinet/in_gif.h>
140: #include "gif.h"
1.144 martin 141: #include <net/if_gre.h>
142: #include "gre.h"
1.111 jdolecek 143:
144: #ifdef MROUTING
145: #include <netinet/ip_mroute.h>
146: #endif
1.302 christos 147: #include <netinet/portalgo.h>
1.89 itojun 148:
1.304 christos 149: #ifdef IPSEC
1.173 jonathan 150: #include <netipsec/ipsec.h>
1.305 rmind 151: #endif
1.44 thorpej 152:
1.1 cgd 153: #ifndef IPFORWARDING
154: #ifdef GATEWAY
155: #define IPFORWARDING 1 /* forward IP packets not for us */
156: #else /* GATEWAY */
157: #define IPFORWARDING 0 /* don't forward IP packets not for us */
158: #endif /* GATEWAY */
159: #endif /* IPFORWARDING */
160: #ifndef IPSENDREDIRECTS
161: #define IPSENDREDIRECTS 1
162: #endif
1.26 thorpej 163: #ifndef IPFORWSRCRT
1.47 cjs 164: #define IPFORWSRCRT 1 /* forward source-routed packets */
165: #endif
166: #ifndef IPALLOWSRCRT
1.48 mrg 167: #define IPALLOWSRCRT 1 /* allow source-routed packets */
1.26 thorpej 168: #endif
1.53 kml 169: #ifndef IPMTUDISC
1.153 itojun 170: #define IPMTUDISC 1
1.53 kml 171: #endif
1.60 kml 172: #ifndef IPMTUDISCTIMEOUT
1.61 kml 173: #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
1.60 kml 174: #endif
1.53 kml 175:
1.278 christos 176: #ifdef COMPAT_50
177: #include <compat/sys/time.h>
178: #include <compat/sys/socket.h>
179: #endif
180:
1.27 thorpej 181: /*
182: * Note: DIRECTED_BROADCAST is handled this way so that previous
183: * configuration using this option will Just Work.
184: */
185: #ifndef IPDIRECTEDBCAST
186: #ifdef DIRECTED_BROADCAST
187: #define IPDIRECTEDBCAST 1
188: #else
189: #define IPDIRECTEDBCAST 0
190: #endif /* DIRECTED_BROADCAST */
191: #endif /* IPDIRECTEDBCAST */
1.1 cgd 192: int ipforwarding = IPFORWARDING;
193: int ipsendredirects = IPSENDREDIRECTS;
1.13 mycroft 194: int ip_defttl = IPDEFTTL;
1.26 thorpej 195: int ip_forwsrcrt = IPFORWSRCRT;
1.27 thorpej 196: int ip_directedbcast = IPDIRECTEDBCAST;
1.47 cjs 197: int ip_allowsrcrt = IPALLOWSRCRT;
1.53 kml 198: int ip_mtudisc = IPMTUDISC;
1.156 itojun 199: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
1.1 cgd 200: #ifdef DIAGNOSTIC
201: int ipprintfs = 0;
202: #endif
1.184 jonathan 203:
204: int ip_do_randomid = 0;
205:
1.165 christos 206: /*
207: * XXX - Setting ip_checkinterface mostly implements the receive side of
208: * the Strong ES model described in RFC 1122, but since the routing table
209: * and transmit implementation do not implement the Strong ES model,
210: * setting this to 1 results in an odd hybrid.
211: *
212: * XXX - ip_checkinterface currently must be disabled if you use ipnat
213: * to translate the destination address to another local interface.
214: *
215: * XXX - ip_checkinterface must be disabled if you add IP aliases
216: * to the loopback interface instead of the interface where the
217: * packets for those addresses are received.
218: */
1.318 rmind 219: static int ip_checkinterface __read_mostly = 0;
1.165 christos 220:
1.60 kml 221: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
222:
1.318 rmind 223: pktqueue_t * ip_pktq __read_mostly;
224: pfil_head_t * inet_pfil_hook __read_mostly;
225: ipid_state_t * ip_ids __read_mostly;
226: percpu_t * ipstat_percpu __read_mostly;
227:
228: static struct route ipforward_rt __cacheline_aligned;
1.286 tls 229:
1.183 jonathan 230: uint16_t ip_id;
1.75 thorpej 231:
1.135 thorpej 232: #ifdef INET_CSUM_COUNTERS
233: #include <sys/device.h>
234:
235: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
236: NULL, "inet", "hwcsum bad");
237: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
238: NULL, "inet", "hwcsum ok");
239: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
240: NULL, "inet", "swcsum");
241:
242: #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
243:
1.201 matt 244: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
245: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
246: EVCNT_ATTACH_STATIC(ip_swcsum);
247:
1.135 thorpej 248: #else
249:
250: #define INET_CSUM_COUNTER_INCR(ev) /* nothing */
251:
252: #endif /* INET_CSUM_COUNTERS */
253:
1.1 cgd 254: /*
255: * We need to save the IP options in case a protocol wants to respond
256: * to an incoming packet over the same route if the packet got here
257: * using IP source routing. This allows connection establishment and
258: * maintenance when the remote end is on a network that is not known
259: * to us.
260: */
1.311 rmind 261:
262: static int ip_nhops = 0;
263:
1.1 cgd 264: static struct ip_srcrt {
265: struct in_addr dst; /* final destination */
266: char nop; /* one NOP to align */
267: char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
268: struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
269: } ip_srcrt;
270:
1.295 dyoung 271: static int ip_drainwanted;
272:
1.318 rmind 273: struct sockaddr_in ipaddr = {
274: .sin_len = sizeof(ipaddr),
275: .sin_family = AF_INET,
276: };
277:
1.210 perry 278: static void save_rte(u_char *, struct in_addr);
1.35 mycroft 279:
1.164 matt 280: #ifdef MBUFTRACE
1.234 dogcow 281: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
282: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164 matt 283: #endif
284:
1.318 rmind 285: static void ipintr(void *);
1.312 rmind 286: static void ip_input(struct mbuf *);
1.313 rmind 287: static void ip_forward(struct mbuf *, int);
1.311 rmind 288: static bool ip_dooptions(struct mbuf *);
289: static struct in_ifaddr *ip_rtaddr(struct in_addr);
290: static void sysctl_net_inet_ip_setup(struct sysctllog **);
1.284 pooka 291:
1.318 rmind 292: /* XXX: Not yet enabled. */
293: #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
294: #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
295:
1.1 cgd 296: /*
297: * IP initialization: fill in IP protocol switch table.
298: * All protocols not implemented in kernel go to raw IP protocol handler.
299: */
1.8 mycroft 300: void
1.211 perry 301: ip_init(void)
1.1 cgd 302: {
1.199 matt 303: const struct protosw *pr;
1.1 cgd 304:
1.311 rmind 305: in_init();
1.284 pooka 306: sysctl_net_inet_ip_setup(NULL);
307:
1.311 rmind 308: pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
309: KASSERT(pr != NULL);
1.275 pooka 310:
1.319 ozaki-r 311: ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318 rmind 312: KASSERT(ip_pktq != NULL);
313:
1.311 rmind 314: for (u_int i = 0; i < IPPROTO_MAX; i++) {
1.1 cgd 315: ip_protox[i] = pr - inetsw;
1.311 rmind 316: }
1.1 cgd 317: for (pr = inetdomain.dom_protosw;
318: pr < inetdomain.dom_protoswNPROTOSW; pr++)
319: if (pr->pr_domain->dom_family == PF_INET &&
320: pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
321: ip_protox[pr->pr_protocol] = pr - inetsw;
1.192 jonathan 322:
1.288 rmind 323: ip_reass_init();
1.190 jonathan 324:
1.291 rmind 325: ip_ids = ip_id_init();
1.319.4.3 skrll 326: ip_id = time_uptime & 0xfffff;
1.194 jonathan 327:
1.160 itojun 328: ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.73 thorpej 329: #ifdef GATEWAY
1.311 rmind 330: ipflow_init();
1.73 thorpej 331: #endif
1.121 thorpej 332:
333: /* Register our Packet Filter hook. */
1.308 rmind 334: inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
335: KASSERT(inet_pfil_hook != NULL);
1.135 thorpej 336:
1.164 matt 337: #ifdef MBUFTRACE
338: MOWNER_ATTACH(&ip_tx_mowner);
339: MOWNER_ATTACH(&ip_rx_mowner);
340: #endif /* MBUFTRACE */
1.266 thorpej 341:
342: ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.1 cgd 343: }
344:
345: /*
1.318 rmind 346: * IP software interrupt routine.
1.89 itojun 347: */
1.318 rmind 348: static void
349: ipintr(void *arg __unused)
1.89 itojun 350: {
351: struct mbuf *m;
1.286 tls 352:
1.318 rmind 353: KASSERT(cpu_softintr_p());
1.89 itojun 354:
1.268 ad 355: mutex_enter(softnet_lock);
1.318 rmind 356: while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89 itojun 357: ip_input(m);
358: }
1.268 ad 359: mutex_exit(softnet_lock);
1.89 itojun 360: }
361:
362: /*
1.318 rmind 363: * IP input routine. Checksum and byte swap header. If fragmented
1.1 cgd 364: * try to reassemble. Process options. Pass to next level.
365: */
1.312 rmind 366: static void
1.89 itojun 367: ip_input(struct mbuf *m)
1.1 cgd 368: {
1.109 augustss 369: struct ip *ip = NULL;
370: struct in_ifaddr *ia;
371: struct ifaddr *ifa;
1.288 rmind 372: int hlen = 0, len;
1.100 itojun 373: int downmatch;
1.165 christos 374: int checkif;
1.169 itojun 375: int srcrt = 0;
1.314 rmind 376: ifnet_t *ifp;
1.1 cgd 377:
1.318 rmind 378: KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
379: "interrupt handler; synchronization assumptions violated");
380:
1.164 matt 381: MCLAIM(m, &ip_rx_mowner);
1.289 rmind 382: KASSERT((m->m_flags & M_PKTHDR) != 0);
1.314 rmind 383: ifp = m->m_pkthdr.rcvif;
1.164 matt 384:
1.1 cgd 385: /*
386: * If no IP addresses have been set yet but the interfaces
387: * are receiving, can't do anything with incoming packets yet.
1.318 rmind 388: * Note: we pre-check without locks held.
1.1 cgd 389: */
1.318 rmind 390: if (!TAILQ_FIRST(&in_ifaddrhead)) {
1.1 cgd 391: goto bad;
1.318 rmind 392: }
1.266 thorpej 393: IP_STATINC(IP_STAT_TOTAL);
1.318 rmind 394:
1.154 thorpej 395: /*
396: * If the IP header is not aligned, slurp it up into a new
397: * mbuf with space for link headers, in the event we forward
398: * it. Otherwise, if it is aligned, make sure the entire
399: * base IP header is in the first mbuf of the chain.
400: */
1.244 christos 401: if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154 thorpej 402: if ((m = m_copyup(m, sizeof(struct ip),
403: (max_linkhdr + 3) & ~3)) == NULL) {
404: /* XXXJRT new stat, please */
1.266 thorpej 405: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 406: return;
407: }
408: } else if (__predict_false(m->m_len < sizeof (struct ip))) {
409: if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
1.266 thorpej 410: IP_STATINC(IP_STAT_TOOSMALL);
1.154 thorpej 411: return;
412: }
1.1 cgd 413: }
414: ip = mtod(m, struct ip *);
1.13 mycroft 415: if (ip->ip_v != IPVERSION) {
1.266 thorpej 416: IP_STATINC(IP_STAT_BADVERS);
1.13 mycroft 417: goto bad;
418: }
1.1 cgd 419: hlen = ip->ip_hl << 2;
420: if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266 thorpej 421: IP_STATINC(IP_STAT_BADHLEN);
1.1 cgd 422: goto bad;
423: }
424: if (hlen > m->m_len) {
1.298 liamjfoy 425: if ((m = m_pullup(m, hlen)) == NULL) {
1.266 thorpej 426: IP_STATINC(IP_STAT_BADHLEN);
1.89 itojun 427: return;
1.1 cgd 428: }
429: ip = mtod(m, struct ip *);
430: }
1.98 thorpej 431:
1.85 hwr 432: /*
1.99 thorpej 433: * RFC1122: packets with a multicast source address are
1.98 thorpej 434: * not allowed.
1.85 hwr 435: */
436: if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266 thorpej 437: IP_STATINC(IP_STAT_BADADDR);
1.85 hwr 438: goto bad;
1.129 itojun 439: }
440:
441: /* 127/8 must not appear on wire - RFC1122 */
442: if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
443: (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314 rmind 444: if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266 thorpej 445: IP_STATINC(IP_STAT_BADADDR);
1.129 itojun 446: goto bad;
1.130 itojun 447: }
1.85 hwr 448: }
449:
1.135 thorpej 450: switch (m->m_pkthdr.csum_flags &
1.314 rmind 451: ((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
1.135 thorpej 452: M_CSUM_IPv4_BAD)) {
453: case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
454: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
455: goto badcsum;
456:
457: case M_CSUM_IPv4:
458: /* Checksum was okay. */
459: INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
460: break;
461:
462: default:
1.206 thorpej 463: /*
464: * Must compute it ourselves. Maybe skip checksum on
465: * loopback interfaces.
466: */
1.314 rmind 467: if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
468: ip_do_loopback_cksum)) {
1.206 thorpej 469: INET_CSUM_COUNTER_INCR(&ip_swcsum);
470: if (in_cksum(m, hlen) != 0)
471: goto badcsum;
472: }
1.135 thorpej 473: break;
1.1 cgd 474: }
475:
1.121 thorpej 476: /* Retrieve the packet length. */
477: len = ntohs(ip->ip_len);
1.81 proff 478:
479: /*
480: * Check for additional length bogosity
481: */
1.84 proff 482: if (len < hlen) {
1.266 thorpej 483: IP_STATINC(IP_STAT_BADLEN);
1.81 proff 484: goto bad;
485: }
1.1 cgd 486:
487: /*
488: * Check that the amount of data in the buffers
489: * is as at least much as the IP header would have us expect.
490: * Trim mbufs if longer than we expect.
491: * Drop packet if shorter than we expect.
492: */
1.35 mycroft 493: if (m->m_pkthdr.len < len) {
1.266 thorpej 494: IP_STATINC(IP_STAT_TOOSHORT);
1.1 cgd 495: goto bad;
496: }
1.35 mycroft 497: if (m->m_pkthdr.len > len) {
1.1 cgd 498: if (m->m_len == m->m_pkthdr.len) {
1.35 mycroft 499: m->m_len = len;
500: m->m_pkthdr.len = len;
1.1 cgd 501: } else
1.35 mycroft 502: m_adj(m, len - m->m_pkthdr.len);
1.1 cgd 503: }
504:
1.64 thorpej 505: /*
506: * Assume that we can create a fast-forward IP flow entry
507: * based on this packet.
508: */
509: m->m_flags |= M_CANFASTFWD;
510:
1.33 mrg 511: /*
1.64 thorpej 512: * Run through list of hooks for input packets. If there are any
513: * filters which require that additional packets in the flow are
514: * not fast-forwarded, they must clear the M_CANFASTFWD flag.
515: * Note that filters must _never_ set this flag, as another filter
516: * in the list may have previously cleared it.
1.33 mrg 517: */
1.304 christos 518: #if defined(IPSEC)
1.317 christos 519: if (!ipsec_used || !ipsec_indone(m))
1.127 itojun 520: #else
521: if (1)
522: #endif
523: {
1.314 rmind 524: struct in_addr odst = ip->ip_dst;
1.318 rmind 525: bool freed;
1.169 itojun 526:
1.318 rmind 527: SOFTNET_LOCK();
528: freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
529: SOFTNET_UNLOCK();
530: if (freed || m == NULL) {
1.127 itojun 531: return;
1.318 rmind 532: }
1.127 itojun 533: ip = mtod(m, struct ip *);
1.142 darrenr 534: hlen = ip->ip_hl << 2;
1.318 rmind 535:
1.205 darrenr 536: /*
537: * XXX The setting of "srcrt" here is to prevent ip_forward()
538: * from generating ICMP redirects for packets that have
539: * been redirected by a hook back out on to the same LAN that
540: * they came from and is not an indication that the packet
541: * is being inffluenced by source routing options. This
542: * allows things like
543: * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
544: * where tlp0 is both on the 1.1.1.0/24 network and is the
545: * default route for hosts on 1.1.1.0/24. Of course this
546: * also requires a "map tlp0 ..." to complete the story.
547: * One might argue whether or not this kind of network config.
1.212 perry 548: * should be supported in this manner...
1.205 darrenr 549: */
1.169 itojun 550: srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127 itojun 551: }
1.123 thorpej 552:
553: #ifdef ALTQ
554: /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318 rmind 555: if (altq_input) {
556: SOFTNET_LOCK();
557: if ((*altq_input)(m, AF_INET) == 0) {
558: /* Packet dropped by traffic conditioner. */
559: SOFTNET_UNLOCK();
560: return;
561: }
562: SOFTNET_UNLOCK();
1.123 thorpej 563: }
564: #endif
1.121 thorpej 565:
566: /*
1.1 cgd 567: * Process options and, if not destined for us,
568: * ship it on. ip_dooptions returns 1 when an
569: * error was detected (causing an icmp message
570: * to be sent and the original packet to be freed).
571: */
572: ip_nhops = 0; /* for source routed packets */
573: if (hlen > sizeof (struct ip) && ip_dooptions(m))
1.89 itojun 574: return;
1.1 cgd 575:
576: /*
1.165 christos 577: * Enable a consistency check between the destination address
578: * and the arrival interface for a unicast packet (the RFC 1122
579: * strong ES model) if IP forwarding is disabled and the packet
580: * is not locally generated.
581: *
582: * XXX - Checking also should be disabled if the destination
583: * address is ipnat'ed to a different interface.
584: *
585: * XXX - Checking is incompatible with IP aliases added
586: * to the loopback interface instead of the interface where
587: * the packets are received.
588: *
589: * XXX - We need to add a per ifaddr flag for this so that
590: * we get finer grain control.
591: */
592: checkif = ip_checkinterface && (ipforwarding == 0) &&
1.315 christos 593: (ifp->if_flags & IFF_LOOPBACK) == 0;
1.165 christos 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
1.319.4.2 skrll 600: * or IN_IFF_NOTREADY addresses 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)) {
1.319.4.2 skrll 605: if (ia->ia4_flags & IN_IFF_NOTREADY)
606: continue;
1.314 rmind 607: if (checkif && ia->ia_ifp != ifp)
1.165 christos 608: continue;
1.97 itojun 609: if ((ia->ia_ifp->if_flags & IFF_UP) != 0)
610: break;
1.100 itojun 611: else
612: downmatch++;
1.97 itojun 613: }
614: }
1.86 thorpej 615: if (ia != NULL)
616: goto ours;
1.315 christos 617: if (ifp->if_flags & IFF_BROADCAST) {
1.314 rmind 618: IFADDR_FOREACH(ifa, ifp) {
1.140 matt 619: if (ifa->ifa_addr->sa_family != AF_INET)
620: continue;
1.57 tls 621: ia = ifatoia(ifa);
1.319.4.2 skrll 622: if (ia->ia4_flags & IN_IFF_NOTREADY)
623: continue;
1.35 mycroft 624: if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
625: in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
1.20 mycroft 626: /*
627: * Look for all-0's host part (old broadcast addr),
628: * either for subnet or net.
629: */
630: ip->ip_dst.s_addr == ia->ia_subnet ||
1.18 mycroft 631: ip->ip_dst.s_addr == ia->ia_net)
1.1 cgd 632: goto ours;
1.57 tls 633: /*
634: * An interface with IP address zero accepts
635: * all packets that arrive on that interface.
636: */
637: if (in_nullhost(ia->ia_addr.sin_addr))
638: goto ours;
1.1 cgd 639: }
640: }
1.18 mycroft 641: if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4 hpeyerl 642: #ifdef MROUTING
643: extern struct socket *ip_mrouter;
1.10 brezak 644:
1.4 hpeyerl 645: if (ip_mrouter) {
646: /*
647: * If we are acting as a multicast router, all
648: * incoming multicast packets are passed to the
649: * kernel-level multicast forwarding function.
650: * The packet is returned (relatively) intact; if
651: * ip_mforward() returns a non-zero value, the packet
652: * must be discarded, else it may be accepted below.
653: *
654: * (The IP ident field is put in the same byte order
655: * as expected when ip_mforward() is called from
656: * ip_output().)
657: */
1.318 rmind 658: SOFTNET_LOCK();
1.314 rmind 659: if (ip_mforward(m, ifp) != 0) {
1.318 rmind 660: SOFTNET_UNLOCK();
1.266 thorpej 661: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 662: m_freem(m);
1.89 itojun 663: return;
1.4 hpeyerl 664: }
1.318 rmind 665: SOFTNET_UNLOCK();
1.4 hpeyerl 666:
667: /*
668: * The process-level routing demon needs to receive
669: * all multicast IGMP packets, whether or not this
670: * host belongs to their destination groups.
671: */
1.318 rmind 672: if (ip->ip_p == IPPROTO_IGMP) {
1.4 hpeyerl 673: goto ours;
1.318 rmind 674: }
1.266 thorpej 675: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 676: }
677: #endif
678: /*
679: * See if we belong to the destination multicast group on the
680: * arrival interface.
681: */
1.316 rmind 682: if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266 thorpej 683: IP_STATINC(IP_STAT_CANTFORWARD);
1.4 hpeyerl 684: m_freem(m);
1.89 itojun 685: return;
1.4 hpeyerl 686: }
687: goto ours;
688: }
1.19 mycroft 689: if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35 mycroft 690: in_nullhost(ip->ip_dst))
1.1 cgd 691: goto ours;
692:
693: /*
694: * Not for us; forward if possible and desirable.
695: */
696: if (ipforwarding == 0) {
1.266 thorpej 697: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 698: m_freem(m);
1.100 itojun 699: } else {
700: /*
701: * If ip_dst matched any of my address on !IFF_UP interface,
702: * and there's no IFF_UP interface that matches ip_dst,
703: * send icmp unreach. Forwarding it will result in in-kernel
704: * forwarding loop till TTL goes to 0.
705: */
706: if (downmatch) {
707: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266 thorpej 708: IP_STATINC(IP_STAT_CANTFORWARD);
1.100 itojun 709: return;
710: }
1.304 christos 711: #ifdef IPSEC
1.305 rmind 712: /* Perform IPsec, if any. */
1.318 rmind 713: if (ipsec_used) {
714: SOFTNET_LOCK();
715: if (ipsec4_input(m, IP_FORWARDING |
716: (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
717: SOFTNET_UNLOCK();
718: goto bad;
719: }
720: SOFTNET_UNLOCK();
1.173 jonathan 721: }
1.305 rmind 722: #endif
1.169 itojun 723: ip_forward(m, srcrt);
1.100 itojun 724: }
1.89 itojun 725: return;
1.1 cgd 726:
727: ours:
728: /*
729: * If offset or IP_MF are set, must reassemble.
730: */
1.155 itojun 731: if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289 rmind 732: /*
733: * Pass to IP reassembly mechanism.
734: */
1.290 rmind 735: if (ip_reass_packet(&m, ip) != 0) {
1.289 rmind 736: /* Failed; invalid fragment(s) or packet. */
1.288 rmind 737: goto bad;
1.16 cgd 738: }
1.290 rmind 739: if (m == NULL) {
1.289 rmind 740: /* More fragments should come; silently return. */
741: return;
742: }
1.290 rmind 743: /*
744: * Reassembly is done, we have the final packet.
745: * Updated cached data in local variable(s).
746: */
1.289 rmind 747: ip = mtod(m, struct ip *);
748: hlen = ip->ip_hl << 2;
1.79 mycroft 749: }
1.128 itojun 750:
1.304 christos 751: #ifdef IPSEC
1.173 jonathan 752: /*
1.305 rmind 753: * Enforce IPsec policy checking if we are seeing last header.
754: * Note that we do not visit this with protocols with PCB layer
755: * code - like UDP/TCP/raw IP.
1.173 jonathan 756: */
1.317 christos 757: if (ipsec_used &&
758: (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.318 rmind 759: SOFTNET_LOCK();
1.305 rmind 760: if (ipsec4_input(m, 0) != 0) {
1.318 rmind 761: SOFTNET_UNLOCK();
1.305 rmind 762: goto bad;
1.173 jonathan 763: }
1.318 rmind 764: SOFTNET_UNLOCK();
1.173 jonathan 765: }
1.305 rmind 766: #endif
1.1 cgd 767:
768: /*
769: * Switch out to protocol's input routine.
770: */
1.82 aidan 771: #if IFA_STATS
1.122 itojun 772: if (ia && ip)
1.155 itojun 773: ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
1.82 aidan 774: #endif
1.266 thorpej 775: IP_STATINC(IP_STAT_DELIVERED);
1.89 itojun 776:
1.318 rmind 777: const int off = hlen, nh = ip->ip_p;
778:
779: SOFTNET_LOCK();
1.89 itojun 780: (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.318 rmind 781: SOFTNET_UNLOCK();
1.89 itojun 782: return;
1.1 cgd 783: bad:
784: m_freem(m);
1.135 thorpej 785: return;
786:
787: badcsum:
1.266 thorpej 788: IP_STATINC(IP_STAT_BADSUM);
1.135 thorpej 789: m_freem(m);
1.1 cgd 790: }
791:
792: /*
1.288 rmind 793: * IP timer processing.
1.1 cgd 794: */
1.8 mycroft 795: void
1.211 perry 796: ip_slowtimo(void)
1.1 cgd 797: {
1.268 ad 798:
799: mutex_enter(softnet_lock);
800: KERNEL_LOCK(1, NULL);
1.1 cgd 801:
1.288 rmind 802: ip_reass_slowtimo();
1.268 ad 803:
804: KERNEL_UNLOCK_ONE(NULL);
805: mutex_exit(softnet_lock);
1.1 cgd 806: }
807:
808: /*
1.288 rmind 809: * IP drain processing.
1.1 cgd 810: */
1.8 mycroft 811: void
1.211 perry 812: ip_drain(void)
1.1 cgd 813: {
814:
1.268 ad 815: KERNEL_LOCK(1, NULL);
1.288 rmind 816: ip_reass_drain();
1.268 ad 817: KERNEL_UNLOCK_ONE(NULL);
1.1 cgd 818: }
819:
820: /*
1.311 rmind 821: * ip_dooptions: perform option processing on a datagram, possibly discarding
822: * it if bad options are encountered, or forwarding it if source-routed.
823: *
824: * => Returns true if packet has been forwarded/freed.
825: * => Returns false if the packet should be processed further.
1.1 cgd 826: */
1.311 rmind 827: static bool
1.211 perry 828: ip_dooptions(struct mbuf *m)
1.1 cgd 829: {
1.109 augustss 830: struct ip *ip = mtod(m, struct ip *);
831: u_char *cp, *cp0;
832: struct ip_timestamp *ipt;
833: struct in_ifaddr *ia;
1.1 cgd 834: int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.104 thorpej 835: struct in_addr dst;
1.1 cgd 836: n_time ntime;
837:
1.13 mycroft 838: dst = ip->ip_dst;
1.1 cgd 839: cp = (u_char *)(ip + 1);
840: cnt = (ip->ip_hl << 2) - sizeof (struct ip);
841: for (; cnt > 0; cnt -= optlen, cp += optlen) {
842: opt = cp[IPOPT_OPTVAL];
843: if (opt == IPOPT_EOL)
844: break;
845: if (opt == IPOPT_NOP)
846: optlen = 1;
847: else {
1.113 itojun 848: if (cnt < IPOPT_OLEN + sizeof(*cp)) {
849: code = &cp[IPOPT_OLEN] - (u_char *)ip;
850: goto bad;
851: }
1.1 cgd 852: optlen = cp[IPOPT_OLEN];
1.114 itojun 853: if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1 cgd 854: code = &cp[IPOPT_OLEN] - (u_char *)ip;
855: goto bad;
856: }
857: }
858: switch (opt) {
859:
860: default:
861: break;
862:
863: /*
864: * Source routing with record.
865: * Find interface with current destination address.
866: * If none on this machine then drop if strictly routed,
867: * or do nothing if loosely routed.
868: * Record interface address and bring up next address
869: * component. If strictly routed make sure next
870: * address is on directly accessible net.
871: */
872: case IPOPT_LSRR:
873: case IPOPT_SSRR:
1.47 cjs 874: if (ip_allowsrcrt == 0) {
875: type = ICMP_UNREACH;
876: code = ICMP_UNREACH_NET_PROHIB;
877: goto bad;
878: }
1.114 itojun 879: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
880: code = &cp[IPOPT_OLEN] - (u_char *)ip;
881: goto bad;
882: }
1.1 cgd 883: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
884: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
885: goto bad;
886: }
887: ipaddr.sin_addr = ip->ip_dst;
1.19 mycroft 888: ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)));
1.1 cgd 889: if (ia == 0) {
890: if (opt == IPOPT_SSRR) {
891: type = ICMP_UNREACH;
892: code = ICMP_UNREACH_SRCFAIL;
893: goto bad;
894: }
895: /*
896: * Loose routing, and not at next destination
897: * yet; nothing to do except forward.
898: */
899: break;
900: }
901: off--; /* 0 origin */
1.112 sommerfe 902: if ((off + sizeof(struct in_addr)) > optlen) {
1.1 cgd 903: /*
904: * End of source route. Should be for us.
905: */
906: save_rte(cp, ip->ip_src);
907: break;
908: }
909: /*
910: * locate outgoing interface
911: */
1.281 tsutsui 912: memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1 cgd 913: sizeof(ipaddr.sin_addr));
1.96 thorpej 914: if (opt == IPOPT_SSRR)
1.196 itojun 915: ia = ifatoia(ifa_ifwithladdr(sintosa(&ipaddr)));
1.96 thorpej 916: else
1.1 cgd 917: ia = ip_rtaddr(ipaddr.sin_addr);
918: if (ia == 0) {
919: type = ICMP_UNREACH;
920: code = ICMP_UNREACH_SRCFAIL;
921: goto bad;
922: }
923: ip->ip_dst = ipaddr.sin_addr;
1.244 christos 924: bcopy((void *)&ia->ia_addr.sin_addr,
925: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 926: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13 mycroft 927: /*
928: * Let ip_intr's mcast routing check handle mcast pkts
929: */
1.18 mycroft 930: forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1 cgd 931: break;
932:
933: case IPOPT_RR:
1.114 itojun 934: if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
935: code = &cp[IPOPT_OLEN] - (u_char *)ip;
936: goto bad;
937: }
1.1 cgd 938: if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
939: code = &cp[IPOPT_OFFSET] - (u_char *)ip;
940: goto bad;
941: }
942: /*
943: * If no space remains, ignore.
944: */
945: off--; /* 0 origin */
1.112 sommerfe 946: if ((off + sizeof(struct in_addr)) > optlen)
1.1 cgd 947: break;
1.281 tsutsui 948: memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
1.1 cgd 949: sizeof(ipaddr.sin_addr));
950: /*
951: * locate outgoing interface; if we're the destination,
952: * use the incoming interface (should be same).
953: */
1.96 thorpej 954: if ((ia = ifatoia(ifa_ifwithaddr(sintosa(&ipaddr))))
955: == NULL &&
956: (ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) {
1.1 cgd 957: type = ICMP_UNREACH;
958: code = ICMP_UNREACH_HOST;
959: goto bad;
960: }
1.244 christos 961: bcopy((void *)&ia->ia_addr.sin_addr,
962: (void *)(cp + off), sizeof(struct in_addr));
1.1 cgd 963: cp[IPOPT_OFFSET] += sizeof(struct in_addr);
964: break;
965:
966: case IPOPT_TS:
967: code = cp - (u_char *)ip;
968: ipt = (struct ip_timestamp *)cp;
1.114 itojun 969: if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
970: code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1 cgd 971: goto bad;
1.114 itojun 972: }
973: if (ipt->ipt_ptr < 5) {
974: code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
975: goto bad;
976: }
1.15 cgd 977: if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
1.114 itojun 978: if (++ipt->ipt_oflw == 0) {
979: code = (u_char *)&ipt->ipt_ptr -
980: (u_char *)ip;
1.1 cgd 981: goto bad;
1.114 itojun 982: }
1.1 cgd 983: break;
984: }
1.104 thorpej 985: cp0 = (cp + ipt->ipt_ptr - 1);
1.1 cgd 986: switch (ipt->ipt_flg) {
987:
988: case IPOPT_TS_TSONLY:
989: break;
990:
991: case IPOPT_TS_TSANDADDR:
1.66 thorpej 992: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 993: sizeof(struct in_addr) > ipt->ipt_len) {
994: code = (u_char *)&ipt->ipt_ptr -
995: (u_char *)ip;
1.1 cgd 996: goto bad;
1.114 itojun 997: }
1.13 mycroft 998: ipaddr.sin_addr = dst;
1.96 thorpej 999: ia = ifatoia(ifaof_ifpforaddr(sintosa(&ipaddr),
1000: m->m_pkthdr.rcvif));
1.13 mycroft 1001: if (ia == 0)
1002: continue;
1.104 thorpej 1003: bcopy(&ia->ia_addr.sin_addr,
1004: cp0, sizeof(struct in_addr));
1.1 cgd 1005: ipt->ipt_ptr += sizeof(struct in_addr);
1006: break;
1007:
1008: case IPOPT_TS_PRESPEC:
1.66 thorpej 1009: if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114 itojun 1010: sizeof(struct in_addr) > ipt->ipt_len) {
1011: code = (u_char *)&ipt->ipt_ptr -
1012: (u_char *)ip;
1.1 cgd 1013: goto bad;
1.114 itojun 1014: }
1.281 tsutsui 1015: memcpy(&ipaddr.sin_addr, cp0,
1.1 cgd 1016: sizeof(struct in_addr));
1.96 thorpej 1017: if (ifatoia(ifa_ifwithaddr(sintosa(&ipaddr)))
1018: == NULL)
1.1 cgd 1019: continue;
1020: ipt->ipt_ptr += sizeof(struct in_addr);
1021: break;
1022:
1023: default:
1.114 itojun 1024: /* XXX can't take &ipt->ipt_flg */
1025: code = (u_char *)&ipt->ipt_ptr -
1026: (u_char *)ip + 1;
1.1 cgd 1027: goto bad;
1028: }
1029: ntime = iptime();
1.107 thorpej 1030: cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244 christos 1031: memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1 cgd 1032: sizeof(n_time));
1033: ipt->ipt_ptr += sizeof(n_time);
1034: }
1035: }
1036: if (forward) {
1.26 thorpej 1037: if (ip_forwsrcrt == 0) {
1038: type = ICMP_UNREACH;
1039: code = ICMP_UNREACH_SRCFAIL;
1040: goto bad;
1041: }
1.1 cgd 1042: ip_forward(m, 1);
1.311 rmind 1043: return true;
1.13 mycroft 1044: }
1.311 rmind 1045: return false;
1.1 cgd 1046: bad:
1.13 mycroft 1047: icmp_error(m, type, code, 0, 0);
1.266 thorpej 1048: IP_STATINC(IP_STAT_BADOPTIONS);
1.311 rmind 1049: return true;
1.1 cgd 1050: }
1051:
1052: /*
1.311 rmind 1053: * ip_rtaddr: given address of next destination (final or next hop),
1.1 cgd 1054: * return internet address info of interface to be used to get there.
1055: */
1.311 rmind 1056: static struct in_ifaddr *
1.211 perry 1057: ip_rtaddr(struct in_addr dst)
1.1 cgd 1058: {
1.249 dyoung 1059: struct rtentry *rt;
1060: union {
1061: struct sockaddr dst;
1062: struct sockaddr_in dst4;
1063: } u;
1064:
1065: sockaddr_in_init(&u.dst4, &dst, 0);
1066:
1.318 rmind 1067: SOFTNET_LOCK();
1068: rt = rtcache_lookup(&ipforward_rt, &u.dst);
1069: SOFTNET_UNLOCK();
1070: if (rt == NULL)
1.249 dyoung 1071: return NULL;
1072:
1073: return ifatoia(rt->rt_ifa);
1.1 cgd 1074: }
1075:
1076: /*
1.311 rmind 1077: * save_rte: save incoming source route for use in replies, to be picked
1078: * up later by ip_srcroute if the receiver is interested.
1.1 cgd 1079: */
1.311 rmind 1080: static void
1.211 perry 1081: save_rte(u_char *option, struct in_addr dst)
1.1 cgd 1082: {
1083: unsigned olen;
1084:
1085: olen = option[IPOPT_OLEN];
1086: if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1087: return;
1.281 tsutsui 1088: memcpy((void *)ip_srcrt.srcopt, (void *)option, olen);
1.1 cgd 1089: ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1090: ip_srcrt.dst = dst;
1091: }
1092:
1093: /*
1094: * Retrieve incoming source route for use in replies,
1095: * in the same form used by setsockopt.
1096: * The first hop is placed before the options, will be removed later.
1097: */
1098: struct mbuf *
1.211 perry 1099: ip_srcroute(void)
1.1 cgd 1100: {
1.109 augustss 1101: struct in_addr *p, *q;
1102: struct mbuf *m;
1.1 cgd 1103:
1104: if (ip_nhops == 0)
1.237 dyoung 1105: return NULL;
1.1 cgd 1106: m = m_get(M_DONTWAIT, MT_SOOPTS);
1107: if (m == 0)
1.237 dyoung 1108: return NULL;
1.1 cgd 1109:
1.164 matt 1110: MCLAIM(m, &inetdomain.dom_mowner);
1.13 mycroft 1111: #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1.1 cgd 1112:
1113: /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1114: m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1115: OPTSIZ;
1116:
1117: /*
1118: * First save first hop for return route
1119: */
1120: p = &ip_srcrt.route[ip_nhops - 1];
1121: *(mtod(m, struct in_addr *)) = *p--;
1122:
1123: /*
1124: * Copy option fields and padding (nop) to mbuf.
1125: */
1126: ip_srcrt.nop = IPOPT_NOP;
1127: ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1.244 christos 1128: memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop,
1129: OPTSIZ);
1130: q = (struct in_addr *)(mtod(m, char *) +
1.1 cgd 1131: sizeof(struct in_addr) + OPTSIZ);
1132: #undef OPTSIZ
1133: /*
1134: * Record return path as an IP source route,
1135: * reversing the path (pointers are now aligned).
1136: */
1137: while (p >= ip_srcrt.route) {
1138: *q++ = *p--;
1139: }
1140: /*
1141: * Last hop goes to final destination.
1142: */
1143: *q = ip_srcrt.dst;
1144: return (m);
1145: }
1146:
1.139 matt 1147: const int inetctlerrmap[PRC_NCMDS] = {
1.256 yamt 1148: [PRC_MSGSIZE] = EMSGSIZE,
1149: [PRC_HOSTDEAD] = EHOSTDOWN,
1150: [PRC_HOSTUNREACH] = EHOSTUNREACH,
1151: [PRC_UNREACH_NET] = EHOSTUNREACH,
1152: [PRC_UNREACH_HOST] = EHOSTUNREACH,
1153: [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
1154: [PRC_UNREACH_PORT] = ECONNREFUSED,
1155: [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
1156: [PRC_PARAMPROB] = ENOPROTOOPT,
1.1 cgd 1157: };
1158:
1.295 dyoung 1159: void
1160: ip_fasttimo(void)
1161: {
1162: if (ip_drainwanted) {
1163: ip_drain();
1164: ip_drainwanted = 0;
1165: }
1166: }
1167:
1168: void
1169: ip_drainstub(void)
1170: {
1171: ip_drainwanted = 1;
1172: }
1173:
1.1 cgd 1174: /*
1175: * Forward a packet. If some error occurs return the sender
1176: * an icmp packet. Note we can't always generate a meaningful
1177: * icmp message because icmp doesn't have a large enough repertoire
1178: * of codes and types.
1179: *
1180: * If not forwarding, just drop the packet. This could be confusing
1181: * if ipforwarding was zero but some routing protocol was advancing
1182: * us as a gateway to somewhere. However, we must let the routing
1183: * protocol deal with that.
1184: *
1185: * The srcrt parameter indicates whether the packet is being forwarded
1186: * via a source route.
1187: */
1.313 rmind 1188: static void
1.211 perry 1189: ip_forward(struct mbuf *m, int srcrt)
1.1 cgd 1190: {
1.109 augustss 1191: struct ip *ip = mtod(m, struct ip *);
1192: struct rtentry *rt;
1.220 christos 1193: int error, type = 0, code = 0, destmtu = 0;
1.1 cgd 1194: struct mbuf *mcopy;
1.13 mycroft 1195: n_long dest;
1.249 dyoung 1196: union {
1197: struct sockaddr dst;
1198: struct sockaddr_in dst4;
1199: } u;
1.319.4.1 skrll 1200: uint64_t *ips;
1.164 matt 1201:
1.318 rmind 1202: KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
1203: "interrupt handler; synchronization assumptions violated");
1204:
1.164 matt 1205: /*
1206: * We are now in the output path.
1207: */
1208: MCLAIM(m, &ip_tx_mowner);
1.135 thorpej 1209:
1210: /*
1211: * Clear any in-bound checksum flags for this packet.
1212: */
1213: m->m_pkthdr.csum_flags = 0;
1.1 cgd 1214:
1.13 mycroft 1215: dest = 0;
1.93 sommerfe 1216: if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266 thorpej 1217: IP_STATINC(IP_STAT_CANTFORWARD);
1.1 cgd 1218: m_freem(m);
1219: return;
1220: }
1.318 rmind 1221:
1222: SOFTNET_LOCK();
1223:
1.1 cgd 1224: if (ip->ip_ttl <= IPTTLDEC) {
1.13 mycroft 1225: icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.318 rmind 1226: SOFTNET_UNLOCK();
1.1 cgd 1227: return;
1228: }
1229:
1.249 dyoung 1230: sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318 rmind 1231:
1.249 dyoung 1232: if ((rt = rtcache_lookup(&ipforward_rt, &u.dst)) == NULL) {
1233: icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
1.318 rmind 1234: SOFTNET_UNLOCK();
1.249 dyoung 1235: return;
1.1 cgd 1236: }
1237:
1238: /*
1.34 mycroft 1239: * Save at most 68 bytes of the packet in case
1.1 cgd 1240: * we need to generate an ICMP message to the src.
1.119 itojun 1241: * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1 cgd 1242: */
1.155 itojun 1243: mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119 itojun 1244: if (mcopy)
1245: mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1 cgd 1246:
1.221 christos 1247: ip->ip_ttl -= IPTTLDEC;
1248:
1.1 cgd 1249: /*
1250: * If forwarding packet using same interface that it came in on,
1251: * perhaps should send a redirect to sender to shortcut a hop.
1252: * Only send redirect if source is sending directly to us,
1253: * and if packet was not source routed (or has any options).
1254: * Also, don't send redirect if forwarding using a default route
1255: * or a route modified by a redirect.
1256: */
1257: if (rt->rt_ifp == m->m_pkthdr.rcvif &&
1258: (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250 dyoung 1259: !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1 cgd 1260: ipsendredirects && !srcrt) {
1.19 mycroft 1261: if (rt->rt_ifa &&
1262: (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
1263: ifatoia(rt->rt_ifa)->ia_subnet) {
1.77 thorpej 1264: if (rt->rt_flags & RTF_GATEWAY)
1265: dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1266: else
1267: dest = ip->ip_dst.s_addr;
1268: /*
1269: * Router requirements says to only send host
1270: * redirects.
1271: */
1272: type = ICMP_REDIRECT;
1273: code = ICMP_REDIRECT_HOST;
1.1 cgd 1274: }
1275: }
1276:
1.238 dyoung 1277: error = ip_output(m, NULL, &ipforward_rt,
1.173 jonathan 1278: (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296 plunky 1279: NULL, NULL);
1.173 jonathan 1280:
1.319.4.1 skrll 1281: if (error) {
1.266 thorpej 1282: IP_STATINC(IP_STAT_CANTFORWARD);
1.319.4.1 skrll 1283: goto error;
1284: }
1285:
1286: ips = IP_STAT_GETREF();
1287: ips[IP_STAT_FORWARD]++;
1288:
1289: if (type) {
1290: ips[IP_STAT_REDIRECTSENT]++;
1291: IP_STAT_PUTREF();
1292: goto redirect;
1293: }
1294:
1295: IP_STAT_PUTREF();
1296: if (mcopy) {
1.63 matt 1297: #ifdef GATEWAY
1.319.4.1 skrll 1298: if (mcopy->m_flags & M_CANFASTFWD)
1299: ipflow_create(&ipforward_rt, mcopy);
1.63 matt 1300: #endif
1.319.4.1 skrll 1301: m_freem(mcopy);
1.1 cgd 1302: }
1.319.4.1 skrll 1303:
1304: SOFTNET_UNLOCK();
1305: return;
1306:
1307: redirect:
1308: error:
1.318 rmind 1309: if (mcopy == NULL) {
1310: SOFTNET_UNLOCK();
1.1 cgd 1311: return;
1.318 rmind 1312: }
1.13 mycroft 1313:
1.1 cgd 1314: switch (error) {
1315:
1316: case 0: /* forwarded, but need redirect */
1317: /* type, code set above */
1318: break;
1319:
1320: case ENETUNREACH: /* shouldn't happen, checked above */
1321: case EHOSTUNREACH:
1322: case ENETDOWN:
1323: case EHOSTDOWN:
1324: default:
1325: type = ICMP_UNREACH;
1326: code = ICMP_UNREACH_HOST;
1327: break;
1328:
1329: case EMSGSIZE:
1330: type = ICMP_UNREACH;
1331: code = ICMP_UNREACH_NEEDFRAG;
1.263 cube 1332:
1.274 seanb 1333: if ((rt = rtcache_validate(&ipforward_rt)) != NULL)
1334: destmtu = rt->rt_ifp->if_mtu;
1.305 rmind 1335: #ifdef IPSEC
1.317 christos 1336: if (ipsec_used)
1337: (void)ipsec4_forward(mcopy, &destmtu);
1.305 rmind 1338: #endif
1.266 thorpej 1339: IP_STATINC(IP_STAT_CANTFRAG);
1.1 cgd 1340: break;
1341:
1342: case ENOBUFS:
1.143 itojun 1343: /*
1.311 rmind 1344: * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
1345: * Requirements for IP Version 4 Routers. Source quench can
1346: * big problem under DoS attacks or if the underlying
1347: * interface is rate-limited.
1.143 itojun 1348: */
1349: if (mcopy)
1350: m_freem(mcopy);
1.318 rmind 1351: SOFTNET_UNLOCK();
1.143 itojun 1352: return;
1.1 cgd 1353: }
1.220 christos 1354: icmp_error(mcopy, type, code, dest, destmtu);
1.318 rmind 1355: SOFTNET_UNLOCK();
1.44 thorpej 1356: }
1357:
1358: void
1.211 perry 1359: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1360: struct mbuf *m)
1.44 thorpej 1361: {
1.311 rmind 1362: struct socket *so = inp->inp_socket;
1.314 rmind 1363: ifnet_t *ifp = m->m_pkthdr.rcvif;
1.311 rmind 1364: int inpflags = inp->inp_flags;
1.44 thorpej 1365:
1.311 rmind 1366: if (so->so_options & SO_TIMESTAMP
1.278 christos 1367: #ifdef SO_OTIMESTAMP
1.311 rmind 1368: || so->so_options & SO_OTIMESTAMP
1.278 christos 1369: #endif
1370: ) {
1.44 thorpej 1371: struct timeval tv;
1372:
1373: microtime(&tv);
1.278 christos 1374: #ifdef SO_OTIMESTAMP
1.311 rmind 1375: if (so->so_options & SO_OTIMESTAMP) {
1.278 christos 1376: struct timeval50 tv50;
1377: timeval_to_timeval50(&tv, &tv50);
1378: *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
1379: SCM_OTIMESTAMP, SOL_SOCKET);
1380: } else
1381: #endif
1.244 christos 1382: *mp = sbcreatecontrol((void *) &tv, sizeof(tv),
1.44 thorpej 1383: SCM_TIMESTAMP, SOL_SOCKET);
1384: if (*mp)
1385: mp = &(*mp)->m_next;
1386: }
1.311 rmind 1387: if (inpflags & INP_RECVDSTADDR) {
1.244 christos 1388: *mp = sbcreatecontrol((void *) &ip->ip_dst,
1.44 thorpej 1389: sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1390: if (*mp)
1391: mp = &(*mp)->m_next;
1392: }
1.311 rmind 1393: if (inpflags & INP_RECVPKTINFO) {
1.306 christos 1394: struct in_pktinfo ipi;
1.307 christos 1395: ipi.ipi_addr = ip->ip_src;
1.314 rmind 1396: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1397: *mp = sbcreatecontrol((void *) &ipi,
1398: sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
1399: if (*mp)
1400: mp = &(*mp)->m_next;
1401: }
1.311 rmind 1402: if (inpflags & INP_PKTINFO) {
1.306 christos 1403: struct in_pktinfo ipi;
1.307 christos 1404: ipi.ipi_addr = ip->ip_dst;
1.314 rmind 1405: ipi.ipi_ifindex = ifp->if_index;
1.306 christos 1406: *mp = sbcreatecontrol((void *) &ipi,
1407: sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
1408: if (*mp)
1409: mp = &(*mp)->m_next;
1410: }
1.311 rmind 1411: if (inpflags & INP_RECVIF) {
1.44 thorpej 1412: struct sockaddr_dl sdl;
1413:
1.314 rmind 1414: sockaddr_dl_init(&sdl, sizeof(sdl), ifp ?
1415: ifp->if_index : 0, 0, NULL, 0, NULL, 0);
1.251 dyoung 1416: *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44 thorpej 1417: if (*mp)
1418: mp = &(*mp)->m_next;
1419: }
1.311 rmind 1420: if (inpflags & INP_RECVTTL) {
1.282 minskim 1421: *mp = sbcreatecontrol((void *) &ip->ip_ttl,
1422: sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
1423: if (*mp)
1424: mp = &(*mp)->m_next;
1425: }
1.13 mycroft 1426: }
1427:
1.189 atatat 1428: /*
1.228 elad 1429: * sysctl helper routine for net.inet.ip.forwsrcrt.
1430: */
1431: static int
1432: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
1433: {
1434: int error, tmp;
1435: struct sysctlnode node;
1436:
1437: node = *rnode;
1438: tmp = ip_forwsrcrt;
1439: node.sysctl_data = &tmp;
1440: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1441: if (error || newp == NULL)
1442: return (error);
1443:
1.280 elad 1444: error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
1445: 0, NULL, NULL, NULL);
1446: if (error)
1447: return (error);
1.228 elad 1448:
1449: ip_forwsrcrt = tmp;
1450:
1451: return (0);
1452: }
1453:
1454: /*
1.189 atatat 1455: * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
1456: * range of the new value and tweaks timers if it changes.
1457: */
1458: static int
1459: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13 mycroft 1460: {
1.189 atatat 1461: int error, tmp;
1462: struct sysctlnode node;
1463:
1464: node = *rnode;
1465: tmp = ip_mtudisc_timeout;
1466: node.sysctl_data = &tmp;
1467: error = sysctl_lookup(SYSCTLFN_CALL(&node));
1468: if (error || newp == NULL)
1469: return (error);
1470: if (tmp < 0)
1471: return (EINVAL);
1.52 thorpej 1472:
1.273 matt 1473: mutex_enter(softnet_lock);
1474:
1.189 atatat 1475: ip_mtudisc_timeout = tmp;
1476: rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1477:
1.273 matt 1478: mutex_exit(softnet_lock);
1479:
1.189 atatat 1480: return (0);
1481: }
1.54 lukem 1482:
1.266 thorpej 1483: static int
1484: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
1485: {
1486:
1.271 thorpej 1487: return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266 thorpej 1488: }
1.131 itojun 1489:
1.284 pooka 1490: static void
1491: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189 atatat 1492: {
1.197 atatat 1493: sysctl_createv(clog, 0, NULL, NULL,
1494: CTLFLAG_PERMANENT,
1.203 atatat 1495: CTLTYPE_NODE, "inet",
1496: SYSCTL_DESCR("PF_INET related settings"),
1.189 atatat 1497: NULL, 0, NULL, 0,
1498: CTL_NET, PF_INET, CTL_EOL);
1.197 atatat 1499: sysctl_createv(clog, 0, NULL, NULL,
1500: CTLFLAG_PERMANENT,
1.203 atatat 1501: CTLTYPE_NODE, "ip",
1502: SYSCTL_DESCR("IPv4 related settings"),
1.189 atatat 1503: NULL, 0, NULL, 0,
1504: CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212 perry 1505:
1.197 atatat 1506: sysctl_createv(clog, 0, NULL, NULL,
1507: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1508: CTLTYPE_INT, "forwarding",
1509: SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189 atatat 1510: NULL, 0, &ipforwarding, 0,
1511: CTL_NET, PF_INET, IPPROTO_IP,
1512: IPCTL_FORWARDING, CTL_EOL);
1.197 atatat 1513: sysctl_createv(clog, 0, NULL, NULL,
1514: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1515: CTLTYPE_INT, "redirect",
1516: SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189 atatat 1517: NULL, 0, &ipsendredirects, 0,
1518: CTL_NET, PF_INET, IPPROTO_IP,
1519: IPCTL_SENDREDIRECTS, CTL_EOL);
1.197 atatat 1520: sysctl_createv(clog, 0, NULL, NULL,
1521: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1522: CTLTYPE_INT, "ttl",
1523: SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189 atatat 1524: NULL, 0, &ip_defttl, 0,
1525: CTL_NET, PF_INET, IPPROTO_IP,
1526: IPCTL_DEFTTL, CTL_EOL);
1527: #ifdef IPCTL_DEFMTU
1.197 atatat 1528: sysctl_createv(clog, 0, NULL, NULL,
1529: CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
1.203 atatat 1530: CTLTYPE_INT, "mtu",
1531: SYSCTL_DESCR("Default MTA for an INET route"),
1.189 atatat 1532: NULL, 0, &ip_mtu, 0,
1533: CTL_NET, PF_INET, IPPROTO_IP,
1534: IPCTL_DEFMTU, CTL_EOL);
1535: #endif /* IPCTL_DEFMTU */
1.197 atatat 1536: sysctl_createv(clog, 0, NULL, NULL,
1.228 elad 1537: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1538: CTLTYPE_INT, "forwsrcrt",
1539: SYSCTL_DESCR("Enable forwarding of source-routed "
1540: "datagrams"),
1.228 elad 1541: sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189 atatat 1542: CTL_NET, PF_INET, IPPROTO_IP,
1543: IPCTL_FORWSRCRT, CTL_EOL);
1.197 atatat 1544: sysctl_createv(clog, 0, NULL, NULL,
1545: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1546: CTLTYPE_INT, "directed-broadcast",
1547: SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189 atatat 1548: NULL, 0, &ip_directedbcast, 0,
1549: CTL_NET, PF_INET, IPPROTO_IP,
1550: IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197 atatat 1551: sysctl_createv(clog, 0, NULL, NULL,
1552: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1553: CTLTYPE_INT, "allowsrcrt",
1554: SYSCTL_DESCR("Accept source-routed datagrams"),
1.189 atatat 1555: NULL, 0, &ip_allowsrcrt, 0,
1556: CTL_NET, PF_INET, IPPROTO_IP,
1557: IPCTL_ALLOWSRCRT, CTL_EOL);
1.311 rmind 1558:
1.197 atatat 1559: sysctl_createv(clog, 0, NULL, NULL,
1560: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1561: CTLTYPE_INT, "mtudisc",
1562: SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189 atatat 1563: NULL, 0, &ip_mtudisc, 0,
1564: CTL_NET, PF_INET, IPPROTO_IP,
1565: IPCTL_MTUDISC, CTL_EOL);
1.197 atatat 1566: sysctl_createv(clog, 0, NULL, NULL,
1567: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1568: CTLTYPE_INT, "anonportmin",
1569: SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189 atatat 1570: sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
1571: CTL_NET, PF_INET, IPPROTO_IP,
1572: IPCTL_ANONPORTMIN, CTL_EOL);
1.197 atatat 1573: sysctl_createv(clog, 0, NULL, NULL,
1574: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1575: CTLTYPE_INT, "anonportmax",
1576: SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189 atatat 1577: sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
1578: CTL_NET, PF_INET, IPPROTO_IP,
1579: IPCTL_ANONPORTMAX, CTL_EOL);
1.197 atatat 1580: sysctl_createv(clog, 0, NULL, NULL,
1581: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1582: CTLTYPE_INT, "mtudisctimeout",
1583: SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300 dsl 1584: sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189 atatat 1585: CTL_NET, PF_INET, IPPROTO_IP,
1586: IPCTL_MTUDISCTIMEOUT, CTL_EOL);
1587: #ifndef IPNOPRIVPORTS
1.197 atatat 1588: sysctl_createv(clog, 0, NULL, NULL,
1589: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1590: CTLTYPE_INT, "lowportmin",
1591: SYSCTL_DESCR("Lowest privileged ephemeral port number "
1592: "to assign"),
1.189 atatat 1593: sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
1594: CTL_NET, PF_INET, IPPROTO_IP,
1595: IPCTL_LOWPORTMIN, CTL_EOL);
1.197 atatat 1596: sysctl_createv(clog, 0, NULL, NULL,
1597: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1598: CTLTYPE_INT, "lowportmax",
1599: SYSCTL_DESCR("Highest privileged ephemeral port number "
1600: "to assign"),
1.189 atatat 1601: sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
1602: CTL_NET, PF_INET, IPPROTO_IP,
1603: IPCTL_LOWPORTMAX, CTL_EOL);
1604: #endif /* IPNOPRIVPORTS */
1605: #if NGRE > 0
1.197 atatat 1606: sysctl_createv(clog, 0, NULL, NULL,
1607: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1608: CTLTYPE_INT, "grettl",
1609: SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189 atatat 1610: NULL, 0, &ip_gre_ttl, 0,
1611: CTL_NET, PF_INET, IPPROTO_IP,
1612: IPCTL_GRE_TTL, CTL_EOL);
1613: #endif /* NGRE */
1.197 atatat 1614: sysctl_createv(clog, 0, NULL, NULL,
1615: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1616: CTLTYPE_INT, "checkinterface",
1617: SYSCTL_DESCR("Enable receive side of Strong ES model "
1618: "from RFC1122"),
1.189 atatat 1619: NULL, 0, &ip_checkinterface, 0,
1620: CTL_NET, PF_INET, IPPROTO_IP,
1621: IPCTL_CHECKINTERFACE, CTL_EOL);
1.197 atatat 1622: sysctl_createv(clog, 0, NULL, NULL,
1623: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203 atatat 1624: CTLTYPE_INT, "random_id",
1625: SYSCTL_DESCR("Assign random ip_id values"),
1.189 atatat 1626: NULL, 0, &ip_do_randomid, 0,
1627: CTL_NET, PF_INET, IPPROTO_IP,
1628: IPCTL_RANDOMID, CTL_EOL);
1.206 thorpej 1629: sysctl_createv(clog, 0, NULL, NULL,
1630: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1631: CTLTYPE_INT, "do_loopback_cksum",
1632: SYSCTL_DESCR("Perform IP checksum on loopback"),
1633: NULL, 0, &ip_do_loopback_cksum, 0,
1634: CTL_NET, PF_INET, IPPROTO_IP,
1635: IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219 elad 1636: sysctl_createv(clog, 0, NULL, NULL,
1637: CTLFLAG_PERMANENT,
1638: CTLTYPE_STRUCT, "stats",
1639: SYSCTL_DESCR("IP statistics"),
1.266 thorpej 1640: sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219 elad 1641: CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
1642: CTL_EOL);
1.319.4.2 skrll 1643: #if NARP
1644: sysctl_createv(clog, 0, NULL, NULL,
1645: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1646: CTLTYPE_INT, "dad_count",
1647: SYSCTL_DESCR("Number of Duplicate Address Detection "
1648: "probes to send"),
1649: NULL, 0, &ip_dad_count, 0,
1650: CTL_NET, PF_INET, IPPROTO_IP,
1651: IPCTL_DAD_COUNT, CTL_EOL);
1652: #endif
1.301 christos 1653:
1654: /* anonportalgo RFC6056 subtree */
1.302 christos 1655: const struct sysctlnode *portalgo_node;
1656: sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301 christos 1657: CTLFLAG_PERMANENT,
1658: CTLTYPE_NODE, "anonportalgo",
1659: SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
1660: NULL, 0, NULL, 0,
1661: CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302 christos 1662: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1663: CTLFLAG_PERMANENT,
1664: CTLTYPE_STRING, "available",
1665: SYSCTL_DESCR("available algorithms"),
1.302 christos 1666: sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301 christos 1667: CTL_CREATE, CTL_EOL);
1.302 christos 1668: sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301 christos 1669: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1670: CTLTYPE_STRING, "selected",
1671: SYSCTL_DESCR("selected algorithm"),
1.303 christos 1672: sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
1673: CTL_CREATE, CTL_EOL);
1674: sysctl_createv(clog, 0, &portalgo_node, NULL,
1675: CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1676: CTLTYPE_STRUCT, "reserve",
1677: SYSCTL_DESCR("bitmap of reserved ports"),
1678: sysctl_portalgo_reserve4, 0, NULL, 0,
1.301 christos 1679: CTL_CREATE, CTL_EOL);
1.1 cgd 1680: }
1.266 thorpej 1681:
1682: void
1683: ip_statinc(u_int stat)
1684: {
1685:
1686: KASSERT(stat < IP_NSTATS);
1687: IP_STATINC(stat);
1688: }
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