1 | /* $NetBSD: ip_input.c,v 1.344 2016/10/18 07:30:31 ozaki-r Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * 3. Neither the name of the project nor the names of its contributors |
16 | * may be used to endorse or promote products derived from this software |
17 | * without specific prior written permission. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 | * SUCH DAMAGE. |
30 | */ |
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 | */ |
61 | |
62 | /* |
63 | * Copyright (c) 1982, 1986, 1988, 1993 |
64 | * The Regents of the University of California. All rights reserved. |
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. |
74 | * 3. Neither the name of the University nor the names of its contributors |
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 | * |
90 | * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
91 | */ |
92 | |
93 | #include <sys/cdefs.h> |
94 | __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.344 2016/10/18 07:30:31 ozaki-r Exp $" ); |
95 | |
96 | #ifdef _KERNEL_OPT |
97 | #include "opt_inet.h" |
98 | #include "opt_compat_netbsd.h" |
99 | #include "opt_gateway.h" |
100 | #include "opt_ipsec.h" |
101 | #include "opt_mrouting.h" |
102 | #include "opt_mbuftrace.h" |
103 | #include "opt_inet_csum.h" |
104 | #include "opt_net_mpsafe.h" |
105 | #endif |
106 | |
107 | #include "arp.h" |
108 | |
109 | #include <sys/param.h> |
110 | #include <sys/systm.h> |
111 | #include <sys/cpu.h> |
112 | #include <sys/mbuf.h> |
113 | #include <sys/domain.h> |
114 | #include <sys/protosw.h> |
115 | #include <sys/socket.h> |
116 | #include <sys/socketvar.h> |
117 | #include <sys/errno.h> |
118 | #include <sys/time.h> |
119 | #include <sys/kernel.h> |
120 | #include <sys/pool.h> |
121 | #include <sys/sysctl.h> |
122 | #include <sys/kauth.h> |
123 | |
124 | #include <net/if.h> |
125 | #include <net/if_dl.h> |
126 | #include <net/route.h> |
127 | #include <net/pktqueue.h> |
128 | #include <net/pfil.h> |
129 | |
130 | #include <netinet/in.h> |
131 | #include <netinet/in_systm.h> |
132 | #include <netinet/ip.h> |
133 | #include <netinet/in_pcb.h> |
134 | #include <netinet/in_proto.h> |
135 | #include <netinet/in_var.h> |
136 | #include <netinet/ip_var.h> |
137 | #include <netinet/ip_private.h> |
138 | #include <netinet/ip_icmp.h> |
139 | /* just for gif_ttl */ |
140 | #include <netinet/in_gif.h> |
141 | #include "gif.h" |
142 | #include <net/if_gre.h> |
143 | #include "gre.h" |
144 | |
145 | #ifdef MROUTING |
146 | #include <netinet/ip_mroute.h> |
147 | #endif |
148 | #include <netinet/portalgo.h> |
149 | |
150 | #ifdef IPSEC |
151 | #include <netipsec/ipsec.h> |
152 | #endif |
153 | |
154 | #ifndef IPFORWARDING |
155 | #ifdef GATEWAY |
156 | #define IPFORWARDING 1 /* forward IP packets not for us */ |
157 | #else /* GATEWAY */ |
158 | #define IPFORWARDING 0 /* don't forward IP packets not for us */ |
159 | #endif /* GATEWAY */ |
160 | #endif /* IPFORWARDING */ |
161 | #ifndef IPSENDREDIRECTS |
162 | #define IPSENDREDIRECTS 1 |
163 | #endif |
164 | #ifndef IPFORWSRCRT |
165 | #define IPFORWSRCRT 1 /* forward source-routed packets */ |
166 | #endif |
167 | #ifndef IPALLOWSRCRT |
168 | #define IPALLOWSRCRT 1 /* allow source-routed packets */ |
169 | #endif |
170 | #ifndef IPMTUDISC |
171 | #define IPMTUDISC 1 |
172 | #endif |
173 | #ifndef IPMTUDISCTIMEOUT |
174 | #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ |
175 | #endif |
176 | |
177 | #ifdef COMPAT_50 |
178 | #include <compat/sys/time.h> |
179 | #include <compat/sys/socket.h> |
180 | #endif |
181 | |
182 | /* |
183 | * Note: DIRECTED_BROADCAST is handled this way so that previous |
184 | * configuration using this option will Just Work. |
185 | */ |
186 | #ifndef IPDIRECTEDBCAST |
187 | #ifdef DIRECTED_BROADCAST |
188 | #define IPDIRECTEDBCAST 1 |
189 | #else |
190 | #define IPDIRECTEDBCAST 0 |
191 | #endif /* DIRECTED_BROADCAST */ |
192 | #endif /* IPDIRECTEDBCAST */ |
193 | int ipforwarding = IPFORWARDING; |
194 | int ipsendredirects = IPSENDREDIRECTS; |
195 | int ip_defttl = IPDEFTTL; |
196 | int ip_forwsrcrt = IPFORWSRCRT; |
197 | int ip_directedbcast = IPDIRECTEDBCAST; |
198 | int ip_allowsrcrt = IPALLOWSRCRT; |
199 | int ip_mtudisc = IPMTUDISC; |
200 | int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; |
201 | #ifdef DIAGNOSTIC |
202 | int ipprintfs = 0; |
203 | #endif |
204 | |
205 | int ip_do_randomid = 0; |
206 | |
207 | /* |
208 | * XXX - Setting ip_checkinterface mostly implements the receive side of |
209 | * the Strong ES model described in RFC 1122, but since the routing table |
210 | * and transmit implementation do not implement the Strong ES model, |
211 | * setting this to 1 results in an odd hybrid. |
212 | * |
213 | * XXX - ip_checkinterface currently must be disabled if you use ipnat |
214 | * to translate the destination address to another local interface. |
215 | * |
216 | * XXX - ip_checkinterface must be disabled if you add IP aliases |
217 | * to the loopback interface instead of the interface where the |
218 | * packets for those addresses are received. |
219 | */ |
220 | static int ip_checkinterface __read_mostly = 0; |
221 | |
222 | struct rttimer_queue *ip_mtudisc_timeout_q = NULL; |
223 | |
224 | pktqueue_t * ip_pktq __read_mostly; |
225 | pfil_head_t * inet_pfil_hook __read_mostly; |
226 | ipid_state_t * ip_ids __read_mostly; |
227 | percpu_t * ipstat_percpu __read_mostly; |
228 | |
229 | static percpu_t *ipforward_rt_percpu __cacheline_aligned; |
230 | |
231 | uint16_t ip_id; |
232 | |
233 | #ifdef INET_CSUM_COUNTERS |
234 | #include <sys/device.h> |
235 | |
236 | struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
237 | NULL, "inet" , "hwcsum bad" ); |
238 | struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
239 | NULL, "inet" , "hwcsum ok" ); |
240 | struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
241 | NULL, "inet" , "swcsum" ); |
242 | |
243 | #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ |
244 | |
245 | EVCNT_ATTACH_STATIC(ip_hwcsum_bad); |
246 | EVCNT_ATTACH_STATIC(ip_hwcsum_ok); |
247 | EVCNT_ATTACH_STATIC(ip_swcsum); |
248 | |
249 | #else |
250 | |
251 | #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ |
252 | |
253 | #endif /* INET_CSUM_COUNTERS */ |
254 | |
255 | /* |
256 | * We need to save the IP options in case a protocol wants to respond |
257 | * to an incoming packet over the same route if the packet got here |
258 | * using IP source routing. This allows connection establishment and |
259 | * maintenance when the remote end is on a network that is not known |
260 | * to us. |
261 | */ |
262 | |
263 | static int ip_nhops = 0; |
264 | |
265 | static struct ip_srcrt { |
266 | struct in_addr dst; /* final destination */ |
267 | char nop; /* one NOP to align */ |
268 | char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ |
269 | struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)]; |
270 | } ip_srcrt; |
271 | |
272 | static int ip_drainwanted; |
273 | |
274 | struct sockaddr_in ipaddr = { |
275 | .sin_len = sizeof(ipaddr), |
276 | .sin_family = AF_INET, |
277 | }; |
278 | |
279 | static void save_rte(u_char *, struct in_addr); |
280 | |
281 | #ifdef MBUFTRACE |
282 | struct mowner ip_rx_mowner = MOWNER_INIT("internet" , "rx" ); |
283 | struct mowner ip_tx_mowner = MOWNER_INIT("internet" , "tx" ); |
284 | #endif |
285 | |
286 | static void ipintr(void *); |
287 | static void ip_input(struct mbuf *); |
288 | static void ip_forward(struct mbuf *, int, struct ifnet *); |
289 | static bool ip_dooptions(struct mbuf *); |
290 | static struct in_ifaddr *ip_rtaddr(struct in_addr); |
291 | static void sysctl_net_inet_ip_setup(struct sysctllog **); |
292 | |
293 | static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, |
294 | int *); |
295 | static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, |
296 | struct ip *); |
297 | |
298 | #ifdef NET_MPSAFE |
299 | #define SOFTNET_LOCK() mutex_enter(softnet_lock) |
300 | #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) |
301 | #else |
302 | #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) |
303 | #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) |
304 | #endif |
305 | |
306 | /* |
307 | * IP initialization: fill in IP protocol switch table. |
308 | * All protocols not implemented in kernel go to raw IP protocol handler. |
309 | */ |
310 | void |
311 | ip_init(void) |
312 | { |
313 | const struct protosw *pr; |
314 | |
315 | in_init(); |
316 | sysctl_net_inet_ip_setup(NULL); |
317 | |
318 | pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); |
319 | KASSERT(pr != NULL); |
320 | |
321 | ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); |
322 | KASSERT(ip_pktq != NULL); |
323 | |
324 | for (u_int i = 0; i < IPPROTO_MAX; i++) { |
325 | ip_protox[i] = pr - inetsw; |
326 | } |
327 | for (pr = inetdomain.dom_protosw; |
328 | pr < inetdomain.dom_protoswNPROTOSW; pr++) |
329 | if (pr->pr_domain->dom_family == PF_INET && |
330 | pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) |
331 | ip_protox[pr->pr_protocol] = pr - inetsw; |
332 | |
333 | ip_reass_init(); |
334 | |
335 | ip_ids = ip_id_init(); |
336 | ip_id = time_uptime & 0xfffff; |
337 | |
338 | ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); |
339 | #ifdef GATEWAY |
340 | ipflow_init(); |
341 | #endif |
342 | |
343 | /* Register our Packet Filter hook. */ |
344 | inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); |
345 | KASSERT(inet_pfil_hook != NULL); |
346 | |
347 | #ifdef MBUFTRACE |
348 | MOWNER_ATTACH(&ip_tx_mowner); |
349 | MOWNER_ATTACH(&ip_rx_mowner); |
350 | #endif /* MBUFTRACE */ |
351 | |
352 | ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); |
353 | |
354 | ipforward_rt_percpu = percpu_alloc(sizeof(struct route)); |
355 | if (ipforward_rt_percpu == NULL) |
356 | panic("failed to allocate ipforward_rt_percpu" ); |
357 | } |
358 | |
359 | static struct in_ifaddr * |
360 | ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) |
361 | { |
362 | struct in_ifaddr *ia = NULL; |
363 | int checkif; |
364 | |
365 | /* |
366 | * Enable a consistency check between the destination address |
367 | * and the arrival interface for a unicast packet (the RFC 1122 |
368 | * strong ES model) if IP forwarding is disabled and the packet |
369 | * is not locally generated. |
370 | * |
371 | * XXX - Checking also should be disabled if the destination |
372 | * address is ipnat'ed to a different interface. |
373 | * |
374 | * XXX - Checking is incompatible with IP aliases added |
375 | * to the loopback interface instead of the interface where |
376 | * the packets are received. |
377 | * |
378 | * XXX - We need to add a per ifaddr flag for this so that |
379 | * we get finer grain control. |
380 | */ |
381 | checkif = ip_checkinterface && (ipforwarding == 0) && |
382 | (ifp->if_flags & IFF_LOOPBACK) == 0; |
383 | |
384 | IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { |
385 | if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { |
386 | if (ia->ia4_flags & IN_IFF_NOTREADY) |
387 | continue; |
388 | if (checkif && ia->ia_ifp != ifp) |
389 | continue; |
390 | if ((ia->ia_ifp->if_flags & IFF_UP) != 0 && |
391 | (ia->ia4_flags & IN_IFF_DETACHED) == 0) |
392 | break; |
393 | else |
394 | (*downmatch)++; |
395 | } |
396 | } |
397 | |
398 | return ia; |
399 | } |
400 | |
401 | static struct in_ifaddr * |
402 | ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) |
403 | { |
404 | struct in_ifaddr *ia = NULL; |
405 | struct ifaddr *ifa; |
406 | |
407 | IFADDR_READER_FOREACH(ifa, ifp) { |
408 | if (ifa->ifa_addr->sa_family != AF_INET) |
409 | continue; |
410 | ia = ifatoia(ifa); |
411 | if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) |
412 | continue; |
413 | if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || |
414 | in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || |
415 | /* |
416 | * Look for all-0's host part (old broadcast addr), |
417 | * either for subnet or net. |
418 | */ |
419 | ip->ip_dst.s_addr == ia->ia_subnet || |
420 | ip->ip_dst.s_addr == ia->ia_net) |
421 | goto matched; |
422 | /* |
423 | * An interface with IP address zero accepts |
424 | * all packets that arrive on that interface. |
425 | */ |
426 | if (in_nullhost(ia->ia_addr.sin_addr)) |
427 | goto matched; |
428 | } |
429 | ia = NULL; |
430 | |
431 | matched: |
432 | return ia; |
433 | } |
434 | |
435 | /* |
436 | * IP software interrupt routine. |
437 | */ |
438 | static void |
439 | ipintr(void *arg __unused) |
440 | { |
441 | struct mbuf *m; |
442 | |
443 | KASSERT(cpu_softintr_p()); |
444 | |
445 | #ifndef NET_MPSAFE |
446 | mutex_enter(softnet_lock); |
447 | #endif |
448 | while ((m = pktq_dequeue(ip_pktq)) != NULL) { |
449 | ip_input(m); |
450 | } |
451 | #ifndef NET_MPSAFE |
452 | mutex_exit(softnet_lock); |
453 | #endif |
454 | } |
455 | |
456 | /* |
457 | * IP input routine. Checksum and byte swap header. If fragmented |
458 | * try to reassemble. Process options. Pass to next level. |
459 | */ |
460 | static void |
461 | ip_input(struct mbuf *m) |
462 | { |
463 | struct ip *ip = NULL; |
464 | struct in_ifaddr *ia = NULL; |
465 | int hlen = 0, len; |
466 | int downmatch; |
467 | int srcrt = 0; |
468 | ifnet_t *ifp; |
469 | struct psref psref; |
470 | int s; |
471 | |
472 | KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " |
473 | "interrupt handler; synchronization assumptions violated" ); |
474 | |
475 | MCLAIM(m, &ip_rx_mowner); |
476 | KASSERT((m->m_flags & M_PKTHDR) != 0); |
477 | |
478 | ifp = m_get_rcvif_psref(m, &psref); |
479 | if (__predict_false(ifp == NULL)) |
480 | goto out; |
481 | |
482 | /* |
483 | * If no IP addresses have been set yet but the interfaces |
484 | * are receiving, can't do anything with incoming packets yet. |
485 | * Note: we pre-check without locks held. |
486 | */ |
487 | if (IN_ADDRLIST_READER_EMPTY()) |
488 | goto out; |
489 | IP_STATINC(IP_STAT_TOTAL); |
490 | |
491 | /* |
492 | * If the IP header is not aligned, slurp it up into a new |
493 | * mbuf with space for link headers, in the event we forward |
494 | * it. Otherwise, if it is aligned, make sure the entire |
495 | * base IP header is in the first mbuf of the chain. |
496 | */ |
497 | if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { |
498 | if ((m = m_copyup(m, sizeof(struct ip), |
499 | (max_linkhdr + 3) & ~3)) == NULL) { |
500 | /* XXXJRT new stat, please */ |
501 | IP_STATINC(IP_STAT_TOOSMALL); |
502 | goto out; |
503 | } |
504 | } else if (__predict_false(m->m_len < sizeof (struct ip))) { |
505 | if ((m = m_pullup(m, sizeof (struct ip))) == NULL) { |
506 | IP_STATINC(IP_STAT_TOOSMALL); |
507 | goto out; |
508 | } |
509 | } |
510 | ip = mtod(m, struct ip *); |
511 | if (ip->ip_v != IPVERSION) { |
512 | IP_STATINC(IP_STAT_BADVERS); |
513 | goto out; |
514 | } |
515 | hlen = ip->ip_hl << 2; |
516 | if (hlen < sizeof(struct ip)) { /* minimum header length */ |
517 | IP_STATINC(IP_STAT_BADHLEN); |
518 | goto out; |
519 | } |
520 | if (hlen > m->m_len) { |
521 | if ((m = m_pullup(m, hlen)) == NULL) { |
522 | IP_STATINC(IP_STAT_BADHLEN); |
523 | goto out; |
524 | } |
525 | ip = mtod(m, struct ip *); |
526 | } |
527 | |
528 | /* |
529 | * RFC1122: packets with a multicast source address are |
530 | * not allowed. |
531 | */ |
532 | if (IN_MULTICAST(ip->ip_src.s_addr)) { |
533 | IP_STATINC(IP_STAT_BADADDR); |
534 | goto out; |
535 | } |
536 | |
537 | /* 127/8 must not appear on wire - RFC1122 */ |
538 | if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || |
539 | (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { |
540 | if ((ifp->if_flags & IFF_LOOPBACK) == 0) { |
541 | IP_STATINC(IP_STAT_BADADDR); |
542 | goto out; |
543 | } |
544 | } |
545 | |
546 | switch (m->m_pkthdr.csum_flags & |
547 | ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | |
548 | M_CSUM_IPv4_BAD)) { |
549 | case M_CSUM_IPv4|M_CSUM_IPv4_BAD: |
550 | INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); |
551 | IP_STATINC(IP_STAT_BADSUM); |
552 | goto out; |
553 | |
554 | case M_CSUM_IPv4: |
555 | /* Checksum was okay. */ |
556 | INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); |
557 | break; |
558 | |
559 | default: |
560 | /* |
561 | * Must compute it ourselves. Maybe skip checksum on |
562 | * loopback interfaces. |
563 | */ |
564 | if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || |
565 | ip_do_loopback_cksum)) { |
566 | INET_CSUM_COUNTER_INCR(&ip_swcsum); |
567 | if (in_cksum(m, hlen) != 0) { |
568 | IP_STATINC(IP_STAT_BADSUM); |
569 | goto out; |
570 | } |
571 | } |
572 | break; |
573 | } |
574 | |
575 | /* Retrieve the packet length. */ |
576 | len = ntohs(ip->ip_len); |
577 | |
578 | /* |
579 | * Check for additional length bogosity |
580 | */ |
581 | if (len < hlen) { |
582 | IP_STATINC(IP_STAT_BADLEN); |
583 | goto out; |
584 | } |
585 | |
586 | /* |
587 | * Check that the amount of data in the buffers |
588 | * is as at least much as the IP header would have us expect. |
589 | * Trim mbufs if longer than we expect. |
590 | * Drop packet if shorter than we expect. |
591 | */ |
592 | if (m->m_pkthdr.len < len) { |
593 | IP_STATINC(IP_STAT_TOOSHORT); |
594 | goto out; |
595 | } |
596 | if (m->m_pkthdr.len > len) { |
597 | if (m->m_len == m->m_pkthdr.len) { |
598 | m->m_len = len; |
599 | m->m_pkthdr.len = len; |
600 | } else |
601 | m_adj(m, len - m->m_pkthdr.len); |
602 | } |
603 | |
604 | /* |
605 | * Assume that we can create a fast-forward IP flow entry |
606 | * based on this packet. |
607 | */ |
608 | m->m_flags |= M_CANFASTFWD; |
609 | |
610 | /* |
611 | * Run through list of hooks for input packets. If there are any |
612 | * filters which require that additional packets in the flow are |
613 | * not fast-forwarded, they must clear the M_CANFASTFWD flag. |
614 | * Note that filters must _never_ set this flag, as another filter |
615 | * in the list may have previously cleared it. |
616 | */ |
617 | #if defined(IPSEC) |
618 | if (!ipsec_used || !ipsec_indone(m)) |
619 | #else |
620 | if (1) |
621 | #endif |
622 | { |
623 | struct in_addr odst = ip->ip_dst; |
624 | bool freed; |
625 | |
626 | freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; |
627 | if (freed || m == NULL) { |
628 | m = NULL; |
629 | goto out; |
630 | } |
631 | ip = mtod(m, struct ip *); |
632 | hlen = ip->ip_hl << 2; |
633 | |
634 | /* |
635 | * XXX The setting of "srcrt" here is to prevent ip_forward() |
636 | * from generating ICMP redirects for packets that have |
637 | * been redirected by a hook back out on to the same LAN that |
638 | * they came from and is not an indication that the packet |
639 | * is being inffluenced by source routing options. This |
640 | * allows things like |
641 | * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" |
642 | * where tlp0 is both on the 1.1.1.0/24 network and is the |
643 | * default route for hosts on 1.1.1.0/24. Of course this |
644 | * also requires a "map tlp0 ..." to complete the story. |
645 | * One might argue whether or not this kind of network config. |
646 | * should be supported in this manner... |
647 | */ |
648 | srcrt = (odst.s_addr != ip->ip_dst.s_addr); |
649 | } |
650 | |
651 | #ifdef ALTQ |
652 | /* XXX Temporary until ALTQ is changed to use a pfil hook */ |
653 | if (altq_input) { |
654 | SOFTNET_LOCK(); |
655 | if ((*altq_input)(m, AF_INET) == 0) { |
656 | /* Packet dropped by traffic conditioner. */ |
657 | SOFTNET_UNLOCK(); |
658 | m = NULL; |
659 | goto out; |
660 | } |
661 | SOFTNET_UNLOCK(); |
662 | } |
663 | #endif |
664 | |
665 | /* |
666 | * Process options and, if not destined for us, |
667 | * ship it on. ip_dooptions returns 1 when an |
668 | * error was detected (causing an icmp message |
669 | * to be sent and the original packet to be freed). |
670 | */ |
671 | ip_nhops = 0; /* for source routed packets */ |
672 | if (hlen > sizeof (struct ip) && ip_dooptions(m)) { |
673 | m = NULL; |
674 | goto out; |
675 | } |
676 | |
677 | /* |
678 | * Check our list of addresses, to see if the packet is for us. |
679 | * |
680 | * Traditional 4.4BSD did not consult IFF_UP at all. |
681 | * The behavior here is to treat addresses on !IFF_UP interface |
682 | * or IN_IFF_NOTREADY addresses as not mine. |
683 | */ |
684 | downmatch = 0; |
685 | s = pserialize_read_enter(); |
686 | ia = ip_match_our_address(ifp, ip, &downmatch); |
687 | if (ia != NULL) { |
688 | pserialize_read_exit(s); |
689 | goto ours; |
690 | } |
691 | |
692 | if (ifp->if_flags & IFF_BROADCAST) { |
693 | ia = ip_match_our_address_broadcast(ifp, ip); |
694 | if (ia != NULL) { |
695 | pserialize_read_exit(s); |
696 | goto ours; |
697 | } |
698 | } |
699 | pserialize_read_exit(s); |
700 | |
701 | if (IN_MULTICAST(ip->ip_dst.s_addr)) { |
702 | #ifdef MROUTING |
703 | extern struct socket *ip_mrouter; |
704 | |
705 | if (ip_mrouter) { |
706 | /* |
707 | * If we are acting as a multicast router, all |
708 | * incoming multicast packets are passed to the |
709 | * kernel-level multicast forwarding function. |
710 | * The packet is returned (relatively) intact; if |
711 | * ip_mforward() returns a non-zero value, the packet |
712 | * must be discarded, else it may be accepted below. |
713 | * |
714 | * (The IP ident field is put in the same byte order |
715 | * as expected when ip_mforward() is called from |
716 | * ip_output().) |
717 | */ |
718 | SOFTNET_LOCK(); |
719 | if (ip_mforward(m, ifp) != 0) { |
720 | SOFTNET_UNLOCK(); |
721 | IP_STATINC(IP_STAT_CANTFORWARD); |
722 | goto out; |
723 | } |
724 | SOFTNET_UNLOCK(); |
725 | |
726 | /* |
727 | * The process-level routing demon needs to receive |
728 | * all multicast IGMP packets, whether or not this |
729 | * host belongs to their destination groups. |
730 | */ |
731 | if (ip->ip_p == IPPROTO_IGMP) { |
732 | goto ours; |
733 | } |
734 | IP_STATINC(IP_STAT_CANTFORWARD); |
735 | } |
736 | #endif |
737 | /* |
738 | * See if we belong to the destination multicast group on the |
739 | * arrival interface. |
740 | */ |
741 | if (!in_multi_group(ip->ip_dst, ifp, 0)) { |
742 | IP_STATINC(IP_STAT_CANTFORWARD); |
743 | goto out; |
744 | } |
745 | goto ours; |
746 | } |
747 | if (ip->ip_dst.s_addr == INADDR_BROADCAST || |
748 | in_nullhost(ip->ip_dst)) |
749 | goto ours; |
750 | |
751 | /* |
752 | * Not for us; forward if possible and desirable. |
753 | */ |
754 | if (ipforwarding == 0) { |
755 | m_put_rcvif_psref(ifp, &psref); |
756 | IP_STATINC(IP_STAT_CANTFORWARD); |
757 | m_freem(m); |
758 | } else { |
759 | /* |
760 | * If ip_dst matched any of my address on !IFF_UP interface, |
761 | * and there's no IFF_UP interface that matches ip_dst, |
762 | * send icmp unreach. Forwarding it will result in in-kernel |
763 | * forwarding loop till TTL goes to 0. |
764 | */ |
765 | if (downmatch) { |
766 | m_put_rcvif_psref(ifp, &psref); |
767 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); |
768 | IP_STATINC(IP_STAT_CANTFORWARD); |
769 | return; |
770 | } |
771 | #ifdef IPSEC |
772 | /* Perform IPsec, if any. */ |
773 | if (ipsec_used) { |
774 | SOFTNET_LOCK(); |
775 | if (ipsec4_input(m, IP_FORWARDING | |
776 | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) { |
777 | SOFTNET_UNLOCK(); |
778 | goto out; |
779 | } |
780 | SOFTNET_UNLOCK(); |
781 | } |
782 | #endif |
783 | ip_forward(m, srcrt, ifp); |
784 | m_put_rcvif_psref(ifp, &psref); |
785 | } |
786 | return; |
787 | |
788 | ours: |
789 | m_put_rcvif_psref(ifp, &psref); |
790 | ifp = NULL; |
791 | |
792 | /* |
793 | * If offset or IP_MF are set, must reassemble. |
794 | */ |
795 | if (ip->ip_off & ~htons(IP_DF|IP_RF)) { |
796 | /* |
797 | * Pass to IP reassembly mechanism. |
798 | */ |
799 | if (ip_reass_packet(&m, ip) != 0) { |
800 | /* Failed; invalid fragment(s) or packet. */ |
801 | goto out; |
802 | } |
803 | if (m == NULL) { |
804 | /* More fragments should come; silently return. */ |
805 | goto out; |
806 | } |
807 | /* |
808 | * Reassembly is done, we have the final packet. |
809 | * Updated cached data in local variable(s). |
810 | */ |
811 | ip = mtod(m, struct ip *); |
812 | hlen = ip->ip_hl << 2; |
813 | } |
814 | |
815 | #ifdef IPSEC |
816 | /* |
817 | * Enforce IPsec policy checking if we are seeing last header. |
818 | * Note that we do not visit this with protocols with PCB layer |
819 | * code - like UDP/TCP/raw IP. |
820 | */ |
821 | if (ipsec_used && |
822 | (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { |
823 | SOFTNET_LOCK(); |
824 | if (ipsec4_input(m, 0) != 0) { |
825 | SOFTNET_UNLOCK(); |
826 | goto out; |
827 | } |
828 | SOFTNET_UNLOCK(); |
829 | } |
830 | #endif |
831 | |
832 | /* |
833 | * Switch out to protocol's input routine. |
834 | */ |
835 | #if IFA_STATS |
836 | if (ia && ip) { |
837 | struct in_ifaddr *_ia; |
838 | /* |
839 | * Keep a reference from ip_match_our_address with psref |
840 | * is expensive, so explore ia here again. |
841 | */ |
842 | s = pserialize_read_enter(); |
843 | _ia = in_get_ia(ip->ip_dst); |
844 | _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); |
845 | pserialize_read_exit(s); |
846 | } |
847 | #endif |
848 | IP_STATINC(IP_STAT_DELIVERED); |
849 | |
850 | const int off = hlen, nh = ip->ip_p; |
851 | |
852 | SOFTNET_LOCK(); |
853 | (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); |
854 | SOFTNET_UNLOCK(); |
855 | return; |
856 | |
857 | out: |
858 | m_put_rcvif_psref(ifp, &psref); |
859 | if (m != NULL) |
860 | m_freem(m); |
861 | } |
862 | |
863 | /* |
864 | * IP timer processing. |
865 | */ |
866 | void |
867 | ip_slowtimo(void) |
868 | { |
869 | |
870 | mutex_enter(softnet_lock); |
871 | KERNEL_LOCK(1, NULL); |
872 | |
873 | ip_reass_slowtimo(); |
874 | |
875 | KERNEL_UNLOCK_ONE(NULL); |
876 | mutex_exit(softnet_lock); |
877 | } |
878 | |
879 | /* |
880 | * IP drain processing. |
881 | */ |
882 | void |
883 | ip_drain(void) |
884 | { |
885 | |
886 | KERNEL_LOCK(1, NULL); |
887 | ip_reass_drain(); |
888 | KERNEL_UNLOCK_ONE(NULL); |
889 | } |
890 | |
891 | /* |
892 | * ip_dooptions: perform option processing on a datagram, possibly discarding |
893 | * it if bad options are encountered, or forwarding it if source-routed. |
894 | * |
895 | * => Returns true if packet has been forwarded/freed. |
896 | * => Returns false if the packet should be processed further. |
897 | */ |
898 | static bool |
899 | ip_dooptions(struct mbuf *m) |
900 | { |
901 | struct ip *ip = mtod(m, struct ip *); |
902 | u_char *cp, *cp0; |
903 | struct ip_timestamp *ipt; |
904 | struct in_ifaddr *ia; |
905 | int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; |
906 | struct in_addr dst; |
907 | n_time ntime; |
908 | struct ifaddr *ifa; |
909 | int s; |
910 | |
911 | dst = ip->ip_dst; |
912 | cp = (u_char *)(ip + 1); |
913 | cnt = (ip->ip_hl << 2) - sizeof (struct ip); |
914 | for (; cnt > 0; cnt -= optlen, cp += optlen) { |
915 | opt = cp[IPOPT_OPTVAL]; |
916 | if (opt == IPOPT_EOL) |
917 | break; |
918 | if (opt == IPOPT_NOP) |
919 | optlen = 1; |
920 | else { |
921 | if (cnt < IPOPT_OLEN + sizeof(*cp)) { |
922 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
923 | goto bad; |
924 | } |
925 | optlen = cp[IPOPT_OLEN]; |
926 | if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { |
927 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
928 | goto bad; |
929 | } |
930 | } |
931 | switch (opt) { |
932 | |
933 | default: |
934 | break; |
935 | |
936 | /* |
937 | * Source routing with record. |
938 | * Find interface with current destination address. |
939 | * If none on this machine then drop if strictly routed, |
940 | * or do nothing if loosely routed. |
941 | * Record interface address and bring up next address |
942 | * component. If strictly routed make sure next |
943 | * address is on directly accessible net. |
944 | */ |
945 | case IPOPT_LSRR: |
946 | case IPOPT_SSRR: |
947 | if (ip_allowsrcrt == 0) { |
948 | type = ICMP_UNREACH; |
949 | code = ICMP_UNREACH_NET_PROHIB; |
950 | goto bad; |
951 | } |
952 | if (optlen < IPOPT_OFFSET + sizeof(*cp)) { |
953 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
954 | goto bad; |
955 | } |
956 | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { |
957 | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
958 | goto bad; |
959 | } |
960 | ipaddr.sin_addr = ip->ip_dst; |
961 | |
962 | s = pserialize_read_enter(); |
963 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
964 | if (ifa == NULL) { |
965 | pserialize_read_exit(s); |
966 | if (opt == IPOPT_SSRR) { |
967 | type = ICMP_UNREACH; |
968 | code = ICMP_UNREACH_SRCFAIL; |
969 | goto bad; |
970 | } |
971 | /* |
972 | * Loose routing, and not at next destination |
973 | * yet; nothing to do except forward. |
974 | */ |
975 | break; |
976 | } |
977 | pserialize_read_exit(s); |
978 | |
979 | off--; /* 0 origin */ |
980 | if ((off + sizeof(struct in_addr)) > optlen) { |
981 | /* |
982 | * End of source route. Should be for us. |
983 | */ |
984 | save_rte(cp, ip->ip_src); |
985 | break; |
986 | } |
987 | /* |
988 | * locate outgoing interface |
989 | */ |
990 | memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), |
991 | sizeof(ipaddr.sin_addr)); |
992 | s = pserialize_read_enter(); |
993 | if (opt == IPOPT_SSRR) { |
994 | ifa = ifa_ifwithladdr(sintosa(&ipaddr)); |
995 | if (ifa != NULL) |
996 | ia = ifatoia(ifa); |
997 | else |
998 | ia = NULL; |
999 | } else { |
1000 | ia = ip_rtaddr(ipaddr.sin_addr); |
1001 | } |
1002 | if (ia == NULL) { |
1003 | type = ICMP_UNREACH; |
1004 | code = ICMP_UNREACH_SRCFAIL; |
1005 | pserialize_read_exit(s); |
1006 | goto bad; |
1007 | } |
1008 | ip->ip_dst = ipaddr.sin_addr; |
1009 | bcopy((void *)&ia->ia_addr.sin_addr, |
1010 | (void *)(cp + off), sizeof(struct in_addr)); |
1011 | pserialize_read_exit(s); |
1012 | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
1013 | /* |
1014 | * Let ip_intr's mcast routing check handle mcast pkts |
1015 | */ |
1016 | forward = !IN_MULTICAST(ip->ip_dst.s_addr); |
1017 | break; |
1018 | |
1019 | case IPOPT_RR: |
1020 | if (optlen < IPOPT_OFFSET + sizeof(*cp)) { |
1021 | code = &cp[IPOPT_OLEN] - (u_char *)ip; |
1022 | goto bad; |
1023 | } |
1024 | if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { |
1025 | code = &cp[IPOPT_OFFSET] - (u_char *)ip; |
1026 | goto bad; |
1027 | } |
1028 | /* |
1029 | * If no space remains, ignore. |
1030 | */ |
1031 | off--; /* 0 origin */ |
1032 | if ((off + sizeof(struct in_addr)) > optlen) |
1033 | break; |
1034 | memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst), |
1035 | sizeof(ipaddr.sin_addr)); |
1036 | /* |
1037 | * locate outgoing interface; if we're the destination, |
1038 | * use the incoming interface (should be same). |
1039 | */ |
1040 | s = pserialize_read_enter(); |
1041 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
1042 | if (ifa == NULL) { |
1043 | ia = ip_rtaddr(ipaddr.sin_addr); |
1044 | if (ia == NULL) { |
1045 | pserialize_read_exit(s); |
1046 | type = ICMP_UNREACH; |
1047 | code = ICMP_UNREACH_HOST; |
1048 | goto bad; |
1049 | } |
1050 | } else { |
1051 | ia = ifatoia(ifa); |
1052 | } |
1053 | bcopy((void *)&ia->ia_addr.sin_addr, |
1054 | (void *)(cp + off), sizeof(struct in_addr)); |
1055 | pserialize_read_exit(s); |
1056 | cp[IPOPT_OFFSET] += sizeof(struct in_addr); |
1057 | break; |
1058 | |
1059 | case IPOPT_TS: |
1060 | code = cp - (u_char *)ip; |
1061 | ipt = (struct ip_timestamp *)cp; |
1062 | if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { |
1063 | code = (u_char *)&ipt->ipt_len - (u_char *)ip; |
1064 | goto bad; |
1065 | } |
1066 | if (ipt->ipt_ptr < 5) { |
1067 | code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; |
1068 | goto bad; |
1069 | } |
1070 | if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) { |
1071 | if (++ipt->ipt_oflw == 0) { |
1072 | code = (u_char *)&ipt->ipt_ptr - |
1073 | (u_char *)ip; |
1074 | goto bad; |
1075 | } |
1076 | break; |
1077 | } |
1078 | cp0 = (cp + ipt->ipt_ptr - 1); |
1079 | switch (ipt->ipt_flg) { |
1080 | |
1081 | case IPOPT_TS_TSONLY: |
1082 | break; |
1083 | |
1084 | case IPOPT_TS_TSANDADDR: { |
1085 | struct ifnet *rcvif; |
1086 | int _s, _ss; |
1087 | |
1088 | if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
1089 | sizeof(struct in_addr) > ipt->ipt_len) { |
1090 | code = (u_char *)&ipt->ipt_ptr - |
1091 | (u_char *)ip; |
1092 | goto bad; |
1093 | } |
1094 | ipaddr.sin_addr = dst; |
1095 | _ss = pserialize_read_enter(); |
1096 | rcvif = m_get_rcvif(m, &_s); |
1097 | ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif); |
1098 | m_put_rcvif(rcvif, &_s); |
1099 | if (ifa == NULL) { |
1100 | pserialize_read_exit(_ss); |
1101 | break; |
1102 | } |
1103 | ia = ifatoia(ifa); |
1104 | bcopy(&ia->ia_addr.sin_addr, |
1105 | cp0, sizeof(struct in_addr)); |
1106 | pserialize_read_exit(_ss); |
1107 | ipt->ipt_ptr += sizeof(struct in_addr); |
1108 | break; |
1109 | } |
1110 | |
1111 | case IPOPT_TS_PRESPEC: |
1112 | if (ipt->ipt_ptr - 1 + sizeof(n_time) + |
1113 | sizeof(struct in_addr) > ipt->ipt_len) { |
1114 | code = (u_char *)&ipt->ipt_ptr - |
1115 | (u_char *)ip; |
1116 | goto bad; |
1117 | } |
1118 | memcpy(&ipaddr.sin_addr, cp0, |
1119 | sizeof(struct in_addr)); |
1120 | s = pserialize_read_enter(); |
1121 | ifa = ifa_ifwithaddr(sintosa(&ipaddr)); |
1122 | if (ifa == NULL) { |
1123 | pserialize_read_exit(s); |
1124 | continue; |
1125 | } |
1126 | pserialize_read_exit(s); |
1127 | ipt->ipt_ptr += sizeof(struct in_addr); |
1128 | break; |
1129 | |
1130 | default: |
1131 | /* XXX can't take &ipt->ipt_flg */ |
1132 | code = (u_char *)&ipt->ipt_ptr - |
1133 | (u_char *)ip + 1; |
1134 | goto bad; |
1135 | } |
1136 | ntime = iptime(); |
1137 | cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ |
1138 | memmove((char *)cp + ipt->ipt_ptr - 1, cp0, |
1139 | sizeof(n_time)); |
1140 | ipt->ipt_ptr += sizeof(n_time); |
1141 | } |
1142 | } |
1143 | if (forward) { |
1144 | struct ifnet *rcvif; |
1145 | struct psref _psref; |
1146 | |
1147 | if (ip_forwsrcrt == 0) { |
1148 | type = ICMP_UNREACH; |
1149 | code = ICMP_UNREACH_SRCFAIL; |
1150 | goto bad; |
1151 | } |
1152 | |
1153 | rcvif = m_get_rcvif_psref(m, &_psref); |
1154 | if (__predict_false(rcvif == NULL)) { |
1155 | type = ICMP_UNREACH; |
1156 | code = ICMP_UNREACH_HOST; |
1157 | goto bad; |
1158 | } |
1159 | ip_forward(m, 1, rcvif); |
1160 | m_put_rcvif_psref(rcvif, &_psref); |
1161 | return true; |
1162 | } |
1163 | return false; |
1164 | bad: |
1165 | icmp_error(m, type, code, 0, 0); |
1166 | IP_STATINC(IP_STAT_BADOPTIONS); |
1167 | return true; |
1168 | } |
1169 | |
1170 | /* |
1171 | * ip_rtaddr: given address of next destination (final or next hop), |
1172 | * return internet address info of interface to be used to get there. |
1173 | */ |
1174 | static struct in_ifaddr * |
1175 | ip_rtaddr(struct in_addr dst) |
1176 | { |
1177 | struct rtentry *rt; |
1178 | union { |
1179 | struct sockaddr dst; |
1180 | struct sockaddr_in dst4; |
1181 | } u; |
1182 | struct route *ro; |
1183 | |
1184 | sockaddr_in_init(&u.dst4, &dst, 0); |
1185 | |
1186 | SOFTNET_LOCK(); |
1187 | ro = percpu_getref(ipforward_rt_percpu); |
1188 | rt = rtcache_lookup(ro, &u.dst); |
1189 | percpu_putref(ipforward_rt_percpu); |
1190 | SOFTNET_UNLOCK(); |
1191 | if (rt == NULL) |
1192 | return NULL; |
1193 | |
1194 | return ifatoia(rt->rt_ifa); |
1195 | } |
1196 | |
1197 | /* |
1198 | * save_rte: save incoming source route for use in replies, to be picked |
1199 | * up later by ip_srcroute if the receiver is interested. |
1200 | */ |
1201 | static void |
1202 | save_rte(u_char *option, struct in_addr dst) |
1203 | { |
1204 | unsigned olen; |
1205 | |
1206 | olen = option[IPOPT_OLEN]; |
1207 | if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) |
1208 | return; |
1209 | memcpy((void *)ip_srcrt.srcopt, (void *)option, olen); |
1210 | ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); |
1211 | ip_srcrt.dst = dst; |
1212 | } |
1213 | |
1214 | /* |
1215 | * Retrieve incoming source route for use in replies, |
1216 | * in the same form used by setsockopt. |
1217 | * The first hop is placed before the options, will be removed later. |
1218 | */ |
1219 | struct mbuf * |
1220 | ip_srcroute(void) |
1221 | { |
1222 | struct in_addr *p, *q; |
1223 | struct mbuf *m; |
1224 | |
1225 | if (ip_nhops == 0) |
1226 | return NULL; |
1227 | m = m_get(M_DONTWAIT, MT_SOOPTS); |
1228 | if (m == 0) |
1229 | return NULL; |
1230 | |
1231 | MCLAIM(m, &inetdomain.dom_mowner); |
1232 | #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) |
1233 | |
1234 | /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ |
1235 | m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + |
1236 | OPTSIZ; |
1237 | |
1238 | /* |
1239 | * First save first hop for return route |
1240 | */ |
1241 | p = &ip_srcrt.route[ip_nhops - 1]; |
1242 | *(mtod(m, struct in_addr *)) = *p--; |
1243 | |
1244 | /* |
1245 | * Copy option fields and padding (nop) to mbuf. |
1246 | */ |
1247 | ip_srcrt.nop = IPOPT_NOP; |
1248 | ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; |
1249 | memmove(mtod(m, char *) + sizeof(struct in_addr), &ip_srcrt.nop, |
1250 | OPTSIZ); |
1251 | q = (struct in_addr *)(mtod(m, char *) + |
1252 | sizeof(struct in_addr) + OPTSIZ); |
1253 | #undef OPTSIZ |
1254 | /* |
1255 | * Record return path as an IP source route, |
1256 | * reversing the path (pointers are now aligned). |
1257 | */ |
1258 | while (p >= ip_srcrt.route) { |
1259 | *q++ = *p--; |
1260 | } |
1261 | /* |
1262 | * Last hop goes to final destination. |
1263 | */ |
1264 | *q = ip_srcrt.dst; |
1265 | return (m); |
1266 | } |
1267 | |
1268 | const int inetctlerrmap[PRC_NCMDS] = { |
1269 | [PRC_MSGSIZE] = EMSGSIZE, |
1270 | [PRC_HOSTDEAD] = EHOSTDOWN, |
1271 | [PRC_HOSTUNREACH] = EHOSTUNREACH, |
1272 | [PRC_UNREACH_NET] = EHOSTUNREACH, |
1273 | [PRC_UNREACH_HOST] = EHOSTUNREACH, |
1274 | [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, |
1275 | [PRC_UNREACH_PORT] = ECONNREFUSED, |
1276 | [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, |
1277 | [PRC_PARAMPROB] = ENOPROTOOPT, |
1278 | }; |
1279 | |
1280 | void |
1281 | ip_fasttimo(void) |
1282 | { |
1283 | if (ip_drainwanted) { |
1284 | ip_drain(); |
1285 | ip_drainwanted = 0; |
1286 | } |
1287 | } |
1288 | |
1289 | void |
1290 | ip_drainstub(void) |
1291 | { |
1292 | ip_drainwanted = 1; |
1293 | } |
1294 | |
1295 | /* |
1296 | * Forward a packet. If some error occurs return the sender |
1297 | * an icmp packet. Note we can't always generate a meaningful |
1298 | * icmp message because icmp doesn't have a large enough repertoire |
1299 | * of codes and types. |
1300 | * |
1301 | * If not forwarding, just drop the packet. This could be confusing |
1302 | * if ipforwarding was zero but some routing protocol was advancing |
1303 | * us as a gateway to somewhere. However, we must let the routing |
1304 | * protocol deal with that. |
1305 | * |
1306 | * The srcrt parameter indicates whether the packet is being forwarded |
1307 | * via a source route. |
1308 | */ |
1309 | static void |
1310 | ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) |
1311 | { |
1312 | struct ip *ip = mtod(m, struct ip *); |
1313 | struct rtentry *rt; |
1314 | int error, type = 0, code = 0, destmtu = 0; |
1315 | struct mbuf *mcopy; |
1316 | n_long dest; |
1317 | union { |
1318 | struct sockaddr dst; |
1319 | struct sockaddr_in dst4; |
1320 | } u; |
1321 | uint64_t *ips; |
1322 | struct route *ro; |
1323 | |
1324 | KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " |
1325 | "interrupt handler; synchronization assumptions violated" ); |
1326 | |
1327 | /* |
1328 | * We are now in the output path. |
1329 | */ |
1330 | MCLAIM(m, &ip_tx_mowner); |
1331 | |
1332 | /* |
1333 | * Clear any in-bound checksum flags for this packet. |
1334 | */ |
1335 | m->m_pkthdr.csum_flags = 0; |
1336 | |
1337 | dest = 0; |
1338 | if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { |
1339 | IP_STATINC(IP_STAT_CANTFORWARD); |
1340 | m_freem(m); |
1341 | return; |
1342 | } |
1343 | |
1344 | if (ip->ip_ttl <= IPTTLDEC) { |
1345 | icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); |
1346 | return; |
1347 | } |
1348 | |
1349 | sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); |
1350 | |
1351 | ro = percpu_getref(ipforward_rt_percpu); |
1352 | if ((rt = rtcache_lookup(ro, &u.dst)) == NULL) { |
1353 | percpu_putref(ipforward_rt_percpu); |
1354 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); |
1355 | return; |
1356 | } |
1357 | |
1358 | /* |
1359 | * Save at most 68 bytes of the packet in case |
1360 | * we need to generate an ICMP message to the src. |
1361 | * Pullup to avoid sharing mbuf cluster between m and mcopy. |
1362 | */ |
1363 | mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); |
1364 | if (mcopy) |
1365 | mcopy = m_pullup(mcopy, ip->ip_hl << 2); |
1366 | |
1367 | ip->ip_ttl -= IPTTLDEC; |
1368 | |
1369 | /* |
1370 | * If forwarding packet using same interface that it came in on, |
1371 | * perhaps should send a redirect to sender to shortcut a hop. |
1372 | * Only send redirect if source is sending directly to us, |
1373 | * and if packet was not source routed (or has any options). |
1374 | * Also, don't send redirect if forwarding using a default route |
1375 | * or a route modified by a redirect. |
1376 | */ |
1377 | if (rt->rt_ifp == rcvif && |
1378 | (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && |
1379 | !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && |
1380 | ipsendredirects && !srcrt) { |
1381 | if (rt->rt_ifa && |
1382 | (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == |
1383 | ifatoia(rt->rt_ifa)->ia_subnet) { |
1384 | if (rt->rt_flags & RTF_GATEWAY) |
1385 | dest = satosin(rt->rt_gateway)->sin_addr.s_addr; |
1386 | else |
1387 | dest = ip->ip_dst.s_addr; |
1388 | /* |
1389 | * Router requirements says to only send host |
1390 | * redirects. |
1391 | */ |
1392 | type = ICMP_REDIRECT; |
1393 | code = ICMP_REDIRECT_HOST; |
1394 | } |
1395 | } |
1396 | |
1397 | error = ip_output(m, NULL, ro, |
1398 | (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), |
1399 | NULL, NULL); |
1400 | |
1401 | if (error) { |
1402 | IP_STATINC(IP_STAT_CANTFORWARD); |
1403 | goto error; |
1404 | } |
1405 | |
1406 | ips = IP_STAT_GETREF(); |
1407 | ips[IP_STAT_FORWARD]++; |
1408 | |
1409 | if (type) { |
1410 | ips[IP_STAT_REDIRECTSENT]++; |
1411 | IP_STAT_PUTREF(); |
1412 | goto redirect; |
1413 | } |
1414 | |
1415 | IP_STAT_PUTREF(); |
1416 | if (mcopy) { |
1417 | #ifdef GATEWAY |
1418 | if (mcopy->m_flags & M_CANFASTFWD) |
1419 | ipflow_create(ro, mcopy); |
1420 | #endif |
1421 | m_freem(mcopy); |
1422 | } |
1423 | |
1424 | percpu_putref(ipforward_rt_percpu); |
1425 | return; |
1426 | |
1427 | redirect: |
1428 | error: |
1429 | if (mcopy == NULL) { |
1430 | percpu_putref(ipforward_rt_percpu); |
1431 | return; |
1432 | } |
1433 | |
1434 | switch (error) { |
1435 | |
1436 | case 0: /* forwarded, but need redirect */ |
1437 | /* type, code set above */ |
1438 | break; |
1439 | |
1440 | case ENETUNREACH: /* shouldn't happen, checked above */ |
1441 | case EHOSTUNREACH: |
1442 | case ENETDOWN: |
1443 | case EHOSTDOWN: |
1444 | default: |
1445 | type = ICMP_UNREACH; |
1446 | code = ICMP_UNREACH_HOST; |
1447 | break; |
1448 | |
1449 | case EMSGSIZE: |
1450 | type = ICMP_UNREACH; |
1451 | code = ICMP_UNREACH_NEEDFRAG; |
1452 | |
1453 | if ((rt = rtcache_validate(ro)) != NULL) |
1454 | destmtu = rt->rt_ifp->if_mtu; |
1455 | #ifdef IPSEC |
1456 | if (ipsec_used) |
1457 | (void)ipsec4_forward(mcopy, &destmtu); |
1458 | #endif |
1459 | IP_STATINC(IP_STAT_CANTFRAG); |
1460 | break; |
1461 | |
1462 | case ENOBUFS: |
1463 | /* |
1464 | * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, |
1465 | * Requirements for IP Version 4 Routers. Source quench can |
1466 | * big problem under DoS attacks or if the underlying |
1467 | * interface is rate-limited. |
1468 | */ |
1469 | if (mcopy) |
1470 | m_freem(mcopy); |
1471 | percpu_putref(ipforward_rt_percpu); |
1472 | return; |
1473 | } |
1474 | icmp_error(mcopy, type, code, dest, destmtu); |
1475 | percpu_putref(ipforward_rt_percpu); |
1476 | } |
1477 | |
1478 | void |
1479 | ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, |
1480 | struct mbuf *m) |
1481 | { |
1482 | struct socket *so = inp->inp_socket; |
1483 | ifnet_t *ifp; |
1484 | int inpflags = inp->inp_flags; |
1485 | struct psref psref; |
1486 | |
1487 | ifp = m_get_rcvif_psref(m, &psref); |
1488 | if (__predict_false(ifp == NULL)) |
1489 | return; /* XXX should report error? */ |
1490 | |
1491 | if (so->so_options & SO_TIMESTAMP |
1492 | #ifdef SO_OTIMESTAMP |
1493 | || so->so_options & SO_OTIMESTAMP |
1494 | #endif |
1495 | ) { |
1496 | struct timeval tv; |
1497 | |
1498 | microtime(&tv); |
1499 | #ifdef SO_OTIMESTAMP |
1500 | if (so->so_options & SO_OTIMESTAMP) { |
1501 | struct timeval50 tv50; |
1502 | timeval_to_timeval50(&tv, &tv50); |
1503 | *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), |
1504 | SCM_OTIMESTAMP, SOL_SOCKET); |
1505 | } else |
1506 | #endif |
1507 | *mp = sbcreatecontrol((void *) &tv, sizeof(tv), |
1508 | SCM_TIMESTAMP, SOL_SOCKET); |
1509 | if (*mp) |
1510 | mp = &(*mp)->m_next; |
1511 | } |
1512 | if (inpflags & INP_RECVDSTADDR) { |
1513 | *mp = sbcreatecontrol((void *) &ip->ip_dst, |
1514 | sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); |
1515 | if (*mp) |
1516 | mp = &(*mp)->m_next; |
1517 | } |
1518 | if (inpflags & INP_RECVPKTINFO) { |
1519 | struct in_pktinfo ipi; |
1520 | ipi.ipi_addr = ip->ip_src; |
1521 | ipi.ipi_ifindex = ifp->if_index; |
1522 | *mp = sbcreatecontrol((void *) &ipi, |
1523 | sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP); |
1524 | if (*mp) |
1525 | mp = &(*mp)->m_next; |
1526 | } |
1527 | if (inpflags & INP_PKTINFO) { |
1528 | struct in_pktinfo ipi; |
1529 | ipi.ipi_addr = ip->ip_dst; |
1530 | ipi.ipi_ifindex = ifp->if_index; |
1531 | *mp = sbcreatecontrol((void *) &ipi, |
1532 | sizeof(ipi), IP_PKTINFO, IPPROTO_IP); |
1533 | if (*mp) |
1534 | mp = &(*mp)->m_next; |
1535 | } |
1536 | if (inpflags & INP_RECVIF) { |
1537 | struct sockaddr_dl sdl; |
1538 | |
1539 | sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, |
1540 | NULL, 0); |
1541 | *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); |
1542 | if (*mp) |
1543 | mp = &(*mp)->m_next; |
1544 | } |
1545 | if (inpflags & INP_RECVTTL) { |
1546 | *mp = sbcreatecontrol((void *) &ip->ip_ttl, |
1547 | sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); |
1548 | if (*mp) |
1549 | mp = &(*mp)->m_next; |
1550 | } |
1551 | m_put_rcvif_psref(ifp, &psref); |
1552 | } |
1553 | |
1554 | /* |
1555 | * sysctl helper routine for net.inet.ip.forwsrcrt. |
1556 | */ |
1557 | static int |
1558 | sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) |
1559 | { |
1560 | int error, tmp; |
1561 | struct sysctlnode node; |
1562 | |
1563 | node = *rnode; |
1564 | tmp = ip_forwsrcrt; |
1565 | node.sysctl_data = &tmp; |
1566 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
1567 | if (error || newp == NULL) |
1568 | return (error); |
1569 | |
1570 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, |
1571 | 0, NULL, NULL, NULL); |
1572 | if (error) |
1573 | return (error); |
1574 | |
1575 | ip_forwsrcrt = tmp; |
1576 | |
1577 | return (0); |
1578 | } |
1579 | |
1580 | /* |
1581 | * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the |
1582 | * range of the new value and tweaks timers if it changes. |
1583 | */ |
1584 | static int |
1585 | sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) |
1586 | { |
1587 | int error, tmp; |
1588 | struct sysctlnode node; |
1589 | |
1590 | node = *rnode; |
1591 | tmp = ip_mtudisc_timeout; |
1592 | node.sysctl_data = &tmp; |
1593 | error = sysctl_lookup(SYSCTLFN_CALL(&node)); |
1594 | if (error || newp == NULL) |
1595 | return (error); |
1596 | if (tmp < 0) |
1597 | return (EINVAL); |
1598 | |
1599 | mutex_enter(softnet_lock); |
1600 | |
1601 | ip_mtudisc_timeout = tmp; |
1602 | rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); |
1603 | |
1604 | mutex_exit(softnet_lock); |
1605 | |
1606 | return (0); |
1607 | } |
1608 | |
1609 | static int |
1610 | sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) |
1611 | { |
1612 | |
1613 | return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); |
1614 | } |
1615 | |
1616 | static void |
1617 | sysctl_net_inet_ip_setup(struct sysctllog **clog) |
1618 | { |
1619 | sysctl_createv(clog, 0, NULL, NULL, |
1620 | CTLFLAG_PERMANENT, |
1621 | CTLTYPE_NODE, "inet" , |
1622 | SYSCTL_DESCR("PF_INET related settings" ), |
1623 | NULL, 0, NULL, 0, |
1624 | CTL_NET, PF_INET, CTL_EOL); |
1625 | sysctl_createv(clog, 0, NULL, NULL, |
1626 | CTLFLAG_PERMANENT, |
1627 | CTLTYPE_NODE, "ip" , |
1628 | SYSCTL_DESCR("IPv4 related settings" ), |
1629 | NULL, 0, NULL, 0, |
1630 | CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); |
1631 | |
1632 | sysctl_createv(clog, 0, NULL, NULL, |
1633 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1634 | CTLTYPE_INT, "forwarding" , |
1635 | SYSCTL_DESCR("Enable forwarding of INET datagrams" ), |
1636 | NULL, 0, &ipforwarding, 0, |
1637 | CTL_NET, PF_INET, IPPROTO_IP, |
1638 | IPCTL_FORWARDING, CTL_EOL); |
1639 | sysctl_createv(clog, 0, NULL, NULL, |
1640 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1641 | CTLTYPE_INT, "redirect" , |
1642 | SYSCTL_DESCR("Enable sending of ICMP redirect messages" ), |
1643 | NULL, 0, &ipsendredirects, 0, |
1644 | CTL_NET, PF_INET, IPPROTO_IP, |
1645 | IPCTL_SENDREDIRECTS, CTL_EOL); |
1646 | sysctl_createv(clog, 0, NULL, NULL, |
1647 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1648 | CTLTYPE_INT, "ttl" , |
1649 | SYSCTL_DESCR("Default TTL for an INET datagram" ), |
1650 | NULL, 0, &ip_defttl, 0, |
1651 | CTL_NET, PF_INET, IPPROTO_IP, |
1652 | IPCTL_DEFTTL, CTL_EOL); |
1653 | #ifdef IPCTL_DEFMTU |
1654 | sysctl_createv(clog, 0, NULL, NULL, |
1655 | CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */, |
1656 | CTLTYPE_INT, "mtu" , |
1657 | SYSCTL_DESCR("Default MTA for an INET route" ), |
1658 | NULL, 0, &ip_mtu, 0, |
1659 | CTL_NET, PF_INET, IPPROTO_IP, |
1660 | IPCTL_DEFMTU, CTL_EOL); |
1661 | #endif /* IPCTL_DEFMTU */ |
1662 | sysctl_createv(clog, 0, NULL, NULL, |
1663 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1664 | CTLTYPE_INT, "forwsrcrt" , |
1665 | SYSCTL_DESCR("Enable forwarding of source-routed " |
1666 | "datagrams" ), |
1667 | sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, |
1668 | CTL_NET, PF_INET, IPPROTO_IP, |
1669 | IPCTL_FORWSRCRT, CTL_EOL); |
1670 | sysctl_createv(clog, 0, NULL, NULL, |
1671 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1672 | CTLTYPE_INT, "directed-broadcast" , |
1673 | SYSCTL_DESCR("Enable forwarding of broadcast datagrams" ), |
1674 | NULL, 0, &ip_directedbcast, 0, |
1675 | CTL_NET, PF_INET, IPPROTO_IP, |
1676 | IPCTL_DIRECTEDBCAST, CTL_EOL); |
1677 | sysctl_createv(clog, 0, NULL, NULL, |
1678 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1679 | CTLTYPE_INT, "allowsrcrt" , |
1680 | SYSCTL_DESCR("Accept source-routed datagrams" ), |
1681 | NULL, 0, &ip_allowsrcrt, 0, |
1682 | CTL_NET, PF_INET, IPPROTO_IP, |
1683 | IPCTL_ALLOWSRCRT, CTL_EOL); |
1684 | |
1685 | sysctl_createv(clog, 0, NULL, NULL, |
1686 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1687 | CTLTYPE_INT, "mtudisc" , |
1688 | SYSCTL_DESCR("Use RFC1191 Path MTU Discovery" ), |
1689 | NULL, 0, &ip_mtudisc, 0, |
1690 | CTL_NET, PF_INET, IPPROTO_IP, |
1691 | IPCTL_MTUDISC, CTL_EOL); |
1692 | sysctl_createv(clog, 0, NULL, NULL, |
1693 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1694 | CTLTYPE_INT, "anonportmin" , |
1695 | SYSCTL_DESCR("Lowest ephemeral port number to assign" ), |
1696 | sysctl_net_inet_ip_ports, 0, &anonportmin, 0, |
1697 | CTL_NET, PF_INET, IPPROTO_IP, |
1698 | IPCTL_ANONPORTMIN, CTL_EOL); |
1699 | sysctl_createv(clog, 0, NULL, NULL, |
1700 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1701 | CTLTYPE_INT, "anonportmax" , |
1702 | SYSCTL_DESCR("Highest ephemeral port number to assign" ), |
1703 | sysctl_net_inet_ip_ports, 0, &anonportmax, 0, |
1704 | CTL_NET, PF_INET, IPPROTO_IP, |
1705 | IPCTL_ANONPORTMAX, CTL_EOL); |
1706 | sysctl_createv(clog, 0, NULL, NULL, |
1707 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1708 | CTLTYPE_INT, "mtudisctimeout" , |
1709 | SYSCTL_DESCR("Lifetime of a Path MTU Discovered route" ), |
1710 | sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, |
1711 | CTL_NET, PF_INET, IPPROTO_IP, |
1712 | IPCTL_MTUDISCTIMEOUT, CTL_EOL); |
1713 | #ifndef IPNOPRIVPORTS |
1714 | sysctl_createv(clog, 0, NULL, NULL, |
1715 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1716 | CTLTYPE_INT, "lowportmin" , |
1717 | SYSCTL_DESCR("Lowest privileged ephemeral port number " |
1718 | "to assign" ), |
1719 | sysctl_net_inet_ip_ports, 0, &lowportmin, 0, |
1720 | CTL_NET, PF_INET, IPPROTO_IP, |
1721 | IPCTL_LOWPORTMIN, CTL_EOL); |
1722 | sysctl_createv(clog, 0, NULL, NULL, |
1723 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1724 | CTLTYPE_INT, "lowportmax" , |
1725 | SYSCTL_DESCR("Highest privileged ephemeral port number " |
1726 | "to assign" ), |
1727 | sysctl_net_inet_ip_ports, 0, &lowportmax, 0, |
1728 | CTL_NET, PF_INET, IPPROTO_IP, |
1729 | IPCTL_LOWPORTMAX, CTL_EOL); |
1730 | #endif /* IPNOPRIVPORTS */ |
1731 | #if NGRE > 0 |
1732 | sysctl_createv(clog, 0, NULL, NULL, |
1733 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1734 | CTLTYPE_INT, "grettl" , |
1735 | SYSCTL_DESCR("Default TTL for a gre tunnel datagram" ), |
1736 | NULL, 0, &ip_gre_ttl, 0, |
1737 | CTL_NET, PF_INET, IPPROTO_IP, |
1738 | IPCTL_GRE_TTL, CTL_EOL); |
1739 | #endif /* NGRE */ |
1740 | sysctl_createv(clog, 0, NULL, NULL, |
1741 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1742 | CTLTYPE_INT, "checkinterface" , |
1743 | SYSCTL_DESCR("Enable receive side of Strong ES model " |
1744 | "from RFC1122" ), |
1745 | NULL, 0, &ip_checkinterface, 0, |
1746 | CTL_NET, PF_INET, IPPROTO_IP, |
1747 | IPCTL_CHECKINTERFACE, CTL_EOL); |
1748 | sysctl_createv(clog, 0, NULL, NULL, |
1749 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1750 | CTLTYPE_INT, "random_id" , |
1751 | SYSCTL_DESCR("Assign random ip_id values" ), |
1752 | NULL, 0, &ip_do_randomid, 0, |
1753 | CTL_NET, PF_INET, IPPROTO_IP, |
1754 | IPCTL_RANDOMID, CTL_EOL); |
1755 | sysctl_createv(clog, 0, NULL, NULL, |
1756 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1757 | CTLTYPE_INT, "do_loopback_cksum" , |
1758 | SYSCTL_DESCR("Perform IP checksum on loopback" ), |
1759 | NULL, 0, &ip_do_loopback_cksum, 0, |
1760 | CTL_NET, PF_INET, IPPROTO_IP, |
1761 | IPCTL_LOOPBACKCKSUM, CTL_EOL); |
1762 | sysctl_createv(clog, 0, NULL, NULL, |
1763 | CTLFLAG_PERMANENT, |
1764 | CTLTYPE_STRUCT, "stats" , |
1765 | SYSCTL_DESCR("IP statistics" ), |
1766 | sysctl_net_inet_ip_stats, 0, NULL, 0, |
1767 | CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, |
1768 | CTL_EOL); |
1769 | #if NARP |
1770 | sysctl_createv(clog, 0, NULL, NULL, |
1771 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1772 | CTLTYPE_INT, "dad_count" , |
1773 | SYSCTL_DESCR("Number of Duplicate Address Detection " |
1774 | "probes to send" ), |
1775 | NULL, 0, &ip_dad_count, 0, |
1776 | CTL_NET, PF_INET, IPPROTO_IP, |
1777 | IPCTL_DAD_COUNT, CTL_EOL); |
1778 | #endif |
1779 | |
1780 | /* anonportalgo RFC6056 subtree */ |
1781 | const struct sysctlnode *portalgo_node; |
1782 | sysctl_createv(clog, 0, NULL, &portalgo_node, |
1783 | CTLFLAG_PERMANENT, |
1784 | CTLTYPE_NODE, "anonportalgo" , |
1785 | SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)" ), |
1786 | NULL, 0, NULL, 0, |
1787 | CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL); |
1788 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
1789 | CTLFLAG_PERMANENT, |
1790 | CTLTYPE_STRING, "available" , |
1791 | SYSCTL_DESCR("available algorithms" ), |
1792 | sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, |
1793 | CTL_CREATE, CTL_EOL); |
1794 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
1795 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1796 | CTLTYPE_STRING, "selected" , |
1797 | SYSCTL_DESCR("selected algorithm" ), |
1798 | sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN, |
1799 | CTL_CREATE, CTL_EOL); |
1800 | sysctl_createv(clog, 0, &portalgo_node, NULL, |
1801 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
1802 | CTLTYPE_STRUCT, "reserve" , |
1803 | SYSCTL_DESCR("bitmap of reserved ports" ), |
1804 | sysctl_portalgo_reserve4, 0, NULL, 0, |
1805 | CTL_CREATE, CTL_EOL); |
1806 | } |
1807 | |
1808 | void |
1809 | ip_statinc(u_int stat) |
1810 | { |
1811 | |
1812 | KASSERT(stat < IP_NSTATS); |
1813 | IP_STATINC(stat); |
1814 | } |
1815 | |