Remove unused variable.
[dragonfly.git] / sys / netinet / ip_input.c
CommitLineData
984263bc 1/*
66d6c637
JH
2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
f23061d4 4 *
66d6c637
JH
5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
66d6c637
JH
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of The DragonFly Project nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific, prior written permission.
f23061d4 19 *
66d6c637
JH
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
66d6c637 34/*
984263bc
MD
35 * Copyright (c) 1982, 1986, 1988, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
67 * $FreeBSD: src/sys/netinet/ip_input.c,v 1.130.2.52 2003/03/07 07:01:28 silby Exp $
2930a997 68 * $DragonFly: src/sys/netinet/ip_input.c,v 1.84 2008/07/28 13:45:43 sephe Exp $
984263bc
MD
69 */
70
71#define _IP_VHL
72
73#include "opt_bootp.h"
74#include "opt_ipfw.h"
75#include "opt_ipdn.h"
76#include "opt_ipdivert.h"
77#include "opt_ipfilter.h"
78#include "opt_ipstealth.h"
79#include "opt_ipsec.h"
984263bc
MD
80
81#include <sys/param.h>
82#include <sys/systm.h>
83#include <sys/mbuf.h>
84#include <sys/malloc.h>
2b89bacf 85#include <sys/mpipe.h>
984263bc
MD
86#include <sys/domain.h>
87#include <sys/protosw.h>
88#include <sys/socket.h>
89#include <sys/time.h>
fc9c7b4f
HP
90#include <sys/globaldata.h>
91#include <sys/thread.h>
984263bc
MD
92#include <sys/kernel.h>
93#include <sys/syslog.h>
94#include <sys/sysctl.h>
3f9db7f8 95#include <sys/in_cksum.h>
984263bc 96
a00138cb
JS
97#include <machine/stdarg.h>
98
984263bc
MD
99#include <net/if.h>
100#include <net/if_types.h>
101#include <net/if_var.h>
102#include <net/if_dl.h>
e7e55f42 103#include <net/pfil.h>
984263bc
MD
104#include <net/route.h>
105#include <net/netisr.h>
984263bc
MD
106
107#include <netinet/in.h>
108#include <netinet/in_systm.h>
109#include <netinet/in_var.h>
110#include <netinet/ip.h>
111#include <netinet/in_pcb.h>
112#include <netinet/ip_var.h>
113#include <netinet/ip_icmp.h>
984263bc 114
4599cf19
MD
115#include <sys/thread2.h>
116#include <sys/msgport2.h>
117#include <net/netmsg2.h>
984263bc
MD
118
119#include <sys/socketvar.h>
120
1f2de5d4
MD
121#include <net/ipfw/ip_fw.h>
122#include <net/dummynet/ip_dummynet.h>
984263bc
MD
123
124#ifdef IPSEC
125#include <netinet6/ipsec.h>
d2438d69 126#include <netproto/key/key.h>
984263bc
MD
127#endif
128
129#ifdef FAST_IPSEC
bf844ffa
JH
130#include <netproto/ipsec/ipsec.h>
131#include <netproto/ipsec/key.h>
984263bc
MD
132#endif
133
134int rsvp_on = 0;
135static int ip_rsvp_on;
136struct socket *ip_rsvpd;
137
dffa46cd 138int ipforwarding = 0;
984263bc
MD
139SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW,
140 &ipforwarding, 0, "Enable IP forwarding between interfaces");
141
dffa46cd 142static int ipsendredirects = 1; /* XXX */
984263bc
MD
143SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
144 &ipsendredirects, 0, "Enable sending IP redirects");
145
dffa46cd 146int ip_defttl = IPDEFTTL;
984263bc
MD
147SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
148 &ip_defttl, 0, "Maximum TTL on IP packets");
149
dffa46cd 150static int ip_dosourceroute = 0;
984263bc
MD
151SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
152 &ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
153
dffa46cd
JH
154static int ip_acceptsourceroute = 0;
155SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
156 CTLFLAG_RW, &ip_acceptsourceroute, 0,
984263bc
MD
157 "Enable accepting source routed IP packets");
158
dffa46cd 159static int ip_keepfaith = 0;
984263bc 160SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
dffa46cd 161 &ip_keepfaith, 0,
0ca0cd25 162 "Enable packet capture for FAITH IPv4->IPv6 translator daemon");
984263bc 163
dffa46cd
JH
164static int nipq = 0; /* total # of reass queues */
165static int maxnipq;
984263bc 166SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW,
dffa46cd
JH
167 &maxnipq, 0,
168 "Maximum number of IPv4 fragment reassembly queue entries");
984263bc 169
dffa46cd 170static int maxfragsperpacket;
984263bc 171SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
dffa46cd
JH
172 &maxfragsperpacket, 0,
173 "Maximum number of IPv4 fragments allowed per packet");
984263bc 174
dffa46cd 175static int ip_sendsourcequench = 0;
984263bc 176SYSCTL_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
dffa46cd
JH
177 &ip_sendsourcequench, 0,
178 "Enable the transmission of source quench packets");
984263bc 179
b6afe32a 180int ip_do_randomid = 1;
6277137d
MD
181SYSCTL_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
182 &ip_do_randomid, 0,
183 "Assign random ip_id values");
984263bc
MD
184/*
185 * XXX - Setting ip_checkinterface mostly implements the receive side of
186 * the Strong ES model described in RFC 1122, but since the routing table
187 * and transmit implementation do not implement the Strong ES model,
188 * setting this to 1 results in an odd hybrid.
189 *
190 * XXX - ip_checkinterface currently must be disabled if you use ipnat
191 * to translate the destination address to another local interface.
192 *
193 * XXX - ip_checkinterface must be disabled if you add IP aliases
194 * to the loopback interface instead of the interface where the
195 * packets for those addresses are received.
196 */
dffa46cd 197static int ip_checkinterface = 0;
984263bc
MD
198SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
199 &ip_checkinterface, 0, "Verify packet arrives on correct interface");
200
201#ifdef DIAGNOSTIC
dffa46cd 202static int ipprintfs = 0;
984263bc
MD
203#endif
204
984263bc 205extern struct domain inetdomain;
4468b0b4 206extern struct protosw inetsw[];
984263bc 207u_char ip_protox[IPPROTO_MAX];
1b562c24 208struct in_ifaddrhead in_ifaddrheads[MAXCPU]; /* first inet address */
f8983475
SZ
209struct in_ifaddrhashhead *in_ifaddrhashtbls[MAXCPU];
210 /* inet addr hash table */
984263bc 211u_long in_ifaddrhmask; /* mask for hash table */
dffa46cd 212
ae1d3076 213struct ip_stats ipstats_percpu[MAXCPU];
fc9c7b4f
HP
214#ifdef SMP
215static int
216sysctl_ipstats(SYSCTL_HANDLER_ARGS)
217{
218 int cpu, error = 0;
219
220 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 221 if ((error = SYSCTL_OUT(req, &ipstats_percpu[cpu],
fc9c7b4f
HP
222 sizeof(struct ip_stats))))
223 break;
ae1d3076 224 if ((error = SYSCTL_IN(req, &ipstats_percpu[cpu],
fc9c7b4f
HP
225 sizeof(struct ip_stats))))
226 break;
227 }
228
229 return (error);
230}
231SYSCTL_PROC(_net_inet_ip, IPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
232 0, 0, sysctl_ipstats, "S,ip_stats", "IP statistics");
233#else
984263bc 234SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
fc9c7b4f
HP
235 &ipstat, ip_stats, "IP statistics");
236#endif
984263bc
MD
237
238/* Packet reassembly stuff */
dffa46cd
JH
239#define IPREASS_NHASH_LOG2 6
240#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
241#define IPREASS_HMASK (IPREASS_NHASH - 1)
242#define IPREASS_HASH(x,y) \
243 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
984263bc
MD
244
245static struct ipq ipq[IPREASS_NHASH];
984263bc
MD
246
247#ifdef IPCTL_DEFMTU
248SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
249 &ip_mtu, 0, "Default MTU");
250#endif
251
252#ifdef IPSTEALTH
dffa46cd
JH
253static int ipstealth = 0;
254SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW, &ipstealth, 0, "");
255#else
256static const int ipstealth = 0;
984263bc
MD
257#endif
258
259
260/* Firewall hooks */
261ip_fw_chk_t *ip_fw_chk_ptr;
84a3e25a 262ip_fw_dn_io_t *ip_fw_dn_io_ptr;
2930a997 263int ip_fw_loaded;
dffa46cd 264int fw_enable = 1;
984263bc
MD
265int fw_one_pass = 1;
266
e7e55f42 267struct pfil_head inet_pfil_hook;
984263bc
MD
268
269/*
270 * XXX this is ugly -- the following two global variables are
271 * used to store packet state while it travels through the stack.
272 * Note that the code even makes assumptions on the size and
273 * alignment of fields inside struct ip_srcrt so e.g. adding some
274 * fields will break the code. This needs to be fixed.
275 *
276 * We need to save the IP options in case a protocol wants to respond
277 * to an incoming packet over the same route if the packet got here
278 * using IP source routing. This allows connection establishment and
279 * maintenance when the remote end is on a network that is not known
280 * to us.
281 */
dffa46cd
JH
282static int ip_nhops = 0;
283
984263bc
MD
284static struct ip_srcrt {
285 struct in_addr dst; /* final destination */
286 char nop; /* one NOP to align */
287 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
288 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
289} ip_srcrt;
290
2b89bacf
MD
291static MALLOC_DEFINE(M_IPQ, "ipq", "IP Fragment Management");
292static struct malloc_pipe ipq_mpipe;
293
4f277347
JH
294static void save_rte (u_char *, struct in_addr);
295static int ip_dooptions (struct mbuf *m, int,
296 struct sockaddr_in *next_hop);
4f277347 297static void ip_freef (struct ipq *);
4599cf19 298static void ip_input_handler (struct netmsg *);
4f277347 299static struct mbuf *ip_reass (struct mbuf *, struct ipq *,
e5ecc832 300 struct ipq *, u_int32_t *);
984263bc
MD
301
302/*
303 * IP initialization: fill in IP protocol switch table.
304 * All protocols not implemented in kernel go to raw IP protocol handler.
305 */
306void
8a3125c6 307ip_init(void)
984263bc 308{
4468b0b4 309 struct protosw *pr;
2256ba69 310 int i;
fc9c7b4f
HP
311#ifdef SMP
312 int cpu;
313#endif
984263bc 314
2b89bacf
MD
315 /*
316 * Make sure we can handle a reasonable number of fragments but
317 * cap it at 4000 (XXX).
318 */
319 mpipe_init(&ipq_mpipe, M_IPQ, sizeof(struct ipq),
320 IFQ_MAXLEN, 4000, 0, NULL);
f8983475 321 for (i = 0; i < ncpus; ++i) {
1b562c24 322 TAILQ_INIT(&in_ifaddrheads[i]);
f8983475
SZ
323 in_ifaddrhashtbls[i] =
324 hashinit(INADDR_NHASH, M_IFADDR, &in_ifaddrhmask);
325 }
4468b0b4 326 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
dffa46cd 327 if (pr == NULL)
984263bc
MD
328 panic("ip_init");
329 for (i = 0; i < IPPROTO_MAX; i++)
330 ip_protox[i] = pr - inetsw;
4468b0b4
JS
331 for (pr = inetdomain.dom_protosw;
332 pr < inetdomain.dom_protoswNPROTOSW; pr++)
984263bc
MD
333 if (pr->pr_domain->dom_family == PF_INET &&
334 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
335 ip_protox[pr->pr_protocol] = pr - inetsw;
336
e7e55f42
JR
337 inet_pfil_hook.ph_type = PFIL_TYPE_AF;
338 inet_pfil_hook.ph_af = AF_INET;
5e3f3b7a 339 if ((i = pfil_head_register(&inet_pfil_hook)) != 0) {
a6ec04bc 340 kprintf("%s: WARNING: unable to register pfil hook, "
e7e55f42 341 "error %d\n", __func__, i);
5e3f3b7a 342 }
e7e55f42 343
984263bc
MD
344 for (i = 0; i < IPREASS_NHASH; i++)
345 ipq[i].next = ipq[i].prev = &ipq[i];
346
347 maxnipq = nmbclusters / 32;
348 maxfragsperpacket = 16;
349
984263bc 350 ip_id = time_second & 0xffff;
984263bc 351
fc9c7b4f 352 /*
ae1d3076 353 * Initialize IP statistics counters for each CPU.
fc9c7b4f 354 *
fc9c7b4f
HP
355 */
356#ifdef SMP
357 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 358 bzero(&ipstats_percpu[cpu], sizeof(struct ip_stats));
fc9c7b4f
HP
359 }
360#else
361 bzero(&ipstat, sizeof(struct ip_stats));
362#endif
363
934c6849 364 netisr_register(NETISR_IP, ip_mport_in, ip_input_handler);
984263bc
MD
365}
366
367/*
368 * XXX watch out this one. It is perhaps used as a cache for
369 * the most recently used route ? it is cleared in in_addroute()
370 * when a new route is successfully created.
371 */
ecdefdda 372struct route ipforward_rt[MAXCPU];
984263bc 373
0c7ac0cd
JH
374/* Do transport protocol processing. */
375static void
376transport_processing_oncpu(struct mbuf *m, int hlen, struct ip *ip,
377 struct sockaddr_in *nexthop)
378{
379 /*
380 * Switch out to protocol's input routine.
381 */
382 if (nexthop && ip->ip_p == IPPROTO_TCP) {
383 /* TCP needs IPFORWARD info if available */
384 struct m_hdr tag;
385
386 tag.mh_type = MT_TAG;
387 tag.mh_flags = PACKET_TAG_IPFORWARD;
388 tag.mh_data = (caddr_t)nexthop;
389 tag.mh_next = m;
390
391 (*inetsw[ip_protox[ip->ip_p]].pr_input)
392 ((struct mbuf *)&tag, hlen, ip->ip_p);
dffa46cd 393 } else {
0c7ac0cd
JH
394 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen, ip->ip_p);
395 }
396}
397
398struct netmsg_transport_packet {
4599cf19 399 struct netmsg nm_netmsg;
0c7ac0cd
JH
400 struct mbuf *nm_mbuf;
401 int nm_hlen;
402 boolean_t nm_hasnexthop;
403 struct sockaddr_in nm_nexthop;
404};
405
4599cf19
MD
406static void
407transport_processing_handler(netmsg_t netmsg)
0c7ac0cd 408{
4599cf19 409 struct netmsg_transport_packet *msg = (void *)netmsg;
0c7ac0cd
JH
410 struct sockaddr_in *nexthop;
411 struct ip *ip;
412
413 ip = mtod(msg->nm_mbuf, struct ip *);
414 nexthop = msg->nm_hasnexthop ? &msg->nm_nexthop : NULL;
415 transport_processing_oncpu(msg->nm_mbuf, msg->nm_hlen, ip, nexthop);
4599cf19 416 lwkt_replymsg(&msg->nm_netmsg.nm_lmsg, 0);
0c7ac0cd
JH
417}
418
4599cf19 419static void
4f277347
JH
420ip_input_handler(struct netmsg *msg0)
421{
422 struct mbuf *m = ((struct netmsg_packet *)msg0)->nm_packet;
423
424 ip_input(m);
6aad077d 425 /* msg0 was embedded in the mbuf, do not reply! */
4f277347
JH
426}
427
984263bc 428/*
590b8cd4 429 * IP input routine. Checksum and byte swap header. If fragmented
984263bc
MD
430 * try to reassemble. Process options. Pass to next level.
431 */
432void
4f277347 433ip_input(struct mbuf *m)
984263bc
MD
434{
435 struct ip *ip;
436 struct ipq *fp;
437 struct in_ifaddr *ia = NULL;
f8983475 438 struct in_ifaddr_container *iac;
dffa46cd 439 int i, hlen, checkif;
984263bc
MD
440 u_short sum;
441 struct in_addr pkt_dst;
442 u_int32_t divert_info = 0; /* packet divert/tee info */
443 struct ip_fw_args args;
dffa46cd 444 boolean_t using_srcrt = FALSE; /* forward (by PFIL_HOOKS) */
0c7ac0cd 445 boolean_t needredispatch = FALSE;
e7e55f42 446 struct in_addr odst; /* original dst address(NAT) */
984263bc 447 struct m_tag *mtag;
e5ecc832 448#ifdef FAST_IPSEC
984263bc
MD
449 struct tdb_ident *tdbi;
450 struct secpolicy *sp;
1cae611f 451 int error;
dffa46cd 452#endif
984263bc
MD
453
454 args.eh = NULL;
455 args.oif = NULL;
456 args.rule = NULL;
984263bc
MD
457 args.next_hop = NULL;
458
dffa46cd 459 /* Grab info from MT_TAG mbufs prepended to the chain. */
5fe66e68 460 while (m != NULL && m->m_type == MT_TAG) {
984263bc 461 switch(m->_m_tag_id) {
984263bc
MD
462 case PACKET_TAG_IPFORWARD:
463 args.next_hop = (struct sockaddr_in *)m->m_hdr.mh_data;
464 break;
5fe66e68 465 default:
a6ec04bc 466 kprintf("ip_input: unrecognised MT_TAG tag %d\n",
5fe66e68
JH
467 m->_m_tag_id);
468 break;
984263bc 469 }
5fe66e68 470 m = m->m_next;
984263bc 471 }
814907cb 472 M_ASSERTPKTHDR(m);
984263bc 473
4c7020ad
SZ
474 /* Extract info from dummynet tag */
475 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
476 if (mtag != NULL) {
84a3e25a 477 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4c7020ad
SZ
478
479 m_tag_delete(m, mtag);
480 mtag = NULL;
481 }
482
5fe66e68 483 if (args.rule != NULL) { /* dummynet already filtered us */
984263bc
MD
484 ip = mtod(m, struct ip *);
485 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
dffa46cd 486 goto iphack;
984263bc
MD
487 }
488
489 ipstat.ips_total++;
490
55d829f8
JH
491 /* length checks already done in ip_demux() */
492 KASSERT(m->m_len >= sizeof(ip), ("IP header not in one mbuf"));
984263bc 493
984263bc
MD
494 ip = mtod(m, struct ip *);
495
496 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
497 ipstat.ips_badvers++;
498 goto bad;
499 }
500
501 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
9babcab8
JH
502 /* length checks already done in ip_demux() */
503 KASSERT(hlen >= sizeof(struct ip), ("IP header len too small"));
504 KASSERT(m->m_len >= hlen, ("packet shorter than IP header length"));
984263bc
MD
505
506 /* 127/8 must not appear on wire - RFC1122 */
507 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
508 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
dffa46cd 509 if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) {
984263bc
MD
510 ipstat.ips_badaddr++;
511 goto bad;
512 }
513 }
514
515 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
516 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
517 } else {
518 if (hlen == sizeof(struct ip)) {
519 sum = in_cksum_hdr(ip);
520 } else {
521 sum = in_cksum(m, hlen);
522 }
523 }
5fe66e68 524 if (sum != 0) {
984263bc
MD
525 ipstat.ips_badsum++;
526 goto bad;
527 }
528
4d723e5a
JS
529#ifdef ALTQ
530 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
531 /* packet is dropped by traffic conditioner */
532 return;
533 }
534#endif
984263bc
MD
535 /*
536 * Convert fields to host representation.
537 */
538 ip->ip_len = ntohs(ip->ip_len);
539 if (ip->ip_len < hlen) {
540 ipstat.ips_badlen++;
541 goto bad;
542 }
543 ip->ip_off = ntohs(ip->ip_off);
544
545 /*
546 * Check that the amount of data in the buffers
547 * is as at least much as the IP header would have us expect.
548 * Trim mbufs if longer than we expect.
549 * Drop packet if shorter than we expect.
550 */
551 if (m->m_pkthdr.len < ip->ip_len) {
984263bc
MD
552 ipstat.ips_tooshort++;
553 goto bad;
554 }
555 if (m->m_pkthdr.len > ip->ip_len) {
556 if (m->m_len == m->m_pkthdr.len) {
557 m->m_len = ip->ip_len;
558 m->m_pkthdr.len = ip->ip_len;
559 } else
560 m_adj(m, ip->ip_len - m->m_pkthdr.len);
561 }
562#if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
563 /*
564 * Bypass packet filtering for packets from a tunnel (gif).
565 */
566 if (ipsec_gethist(m, NULL))
567 goto pass;
568#endif
569
570 /*
571 * IpHack's section.
572 * Right now when no processing on packet has done
573 * and it is still fresh out of network we do our black
574 * deals with it.
575 * - Firewall: deny/allow/divert
576 * - Xlate: translate packet's addr/port (NAT).
577 * - Pipe: pass pkt through dummynet.
578 * - Wrap: fake packet's addr/port <unimpl.>
579 * - Encapsulate: put it in another IP and send out. <unimp.>
dffa46cd 580 */
984263bc
MD
581
582iphack:
dffa46cd 583
984263bc 584 /*
e7e55f42
JR
585 * Run through list of hooks for input packets.
586 *
587 * NB: Beware of the destination address changing (e.g.
588 * by NAT rewriting). When this happens, tell
589 * ip_forward to do the right thing.
984263bc 590 */
afabe90c
MD
591 if (pfil_has_hooks(&inet_pfil_hook)) {
592 odst = ip->ip_dst;
f23061d4 593 if (pfil_run_hooks(&inet_pfil_hook, &m,
afabe90c
MD
594 m->m_pkthdr.rcvif, PFIL_IN)) {
595 return;
596 }
597 if (m == NULL) /* consumed by filter */
598 return;
599 ip = mtod(m, struct ip *);
600 using_srcrt = (odst.s_addr != ip->ip_dst.s_addr);
601 }
dffa46cd 602
984263bc
MD
603 if (fw_enable && IPFW_LOADED) {
604 /*
605 * If we've been forwarded from the output side, then
606 * skip the firewall a second time
607 */
5fe66e68 608 if (args.next_hop != NULL)
984263bc
MD
609 goto ours;
610
611 args.m = m;
612 i = ip_fw_chk_ptr(&args);
613 m = args.m;
614
5fe66e68
JH
615 if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */
616 if (m != NULL)
984263bc
MD
617 m_freem(m);
618 return;
619 }
5fe66e68 620 ip = mtod(m, struct ip *); /* just in case m changed */
984263bc
MD
621 if (i == 0 && args.next_hop == NULL) /* common case */
622 goto pass;
84a3e25a 623 if (i & IP_FW_PORT_DYNT_FLAG) {
984263bc 624 /* Send packet to the appropriate pipe */
84a3e25a 625 ip_fw_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args);
984263bc
MD
626 return;
627 }
628#ifdef IPDIVERT
dffa46cd 629 if (i != 0 && !(i & IP_FW_PORT_DYNT_FLAG)) {
984263bc
MD
630 /* Divert or tee packet */
631 divert_info = i;
632 goto ours;
633 }
634#endif
635 if (i == 0 && args.next_hop != NULL)
636 goto pass;
637 /*
638 * if we get here, the packet must be dropped
639 */
640 m_freem(m);
641 return;
642 }
643pass:
644
645 /*
646 * Process options and, if not destined for us,
647 * ship it on. ip_dooptions returns 1 when an
648 * error was detected (causing an icmp message
649 * to be sent and the original packet to be freed).
650 */
651 ip_nhops = 0; /* for source routed packets */
dffa46cd 652 if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, args.next_hop))
984263bc
MD
653 return;
654
dffa46cd
JH
655 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
656 * matter if it is destined to another node, or whether it is
657 * a multicast one, RSVP wants it! and prevents it from being forwarded
658 * anywhere else. Also checks if the rsvp daemon is running before
984263bc 659 * grabbing the packet.
dffa46cd
JH
660 */
661 if (rsvp_on && ip->ip_p == IPPROTO_RSVP)
984263bc
MD
662 goto ours;
663
664 /*
665 * Check our list of addresses, to see if the packet is for us.
666 * If we don't have any addresses, assume any unicast packet
667 * we receive might be for us (and let the upper layers deal
668 * with it).
669 */
1b562c24
SZ
670 if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid]) &&
671 !(m->m_flags & (M_MCAST | M_BCAST)))
984263bc
MD
672 goto ours;
673
674 /*
675 * Cache the destination address of the packet; this may be
676 * changed by use of 'ipfw fwd'.
677 */
678 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
679
680 /*
681 * Enable a consistency check between the destination address
682 * and the arrival interface for a unicast packet (the RFC 1122
683 * strong ES model) if IP forwarding is disabled and the packet
684 * is not locally generated and the packet is not subject to
685 * 'ipfw fwd'.
686 *
687 * XXX - Checking also should be disabled if the destination
688 * address is ipnat'ed to a different interface.
689 *
690 * XXX - Checking is incompatible with IP aliases added
691 * to the loopback interface instead of the interface where
692 * the packets are received.
693 */
dffa46cd
JH
694 checkif = ip_checkinterface &&
695 !ipforwarding &&
696 m->m_pkthdr.rcvif != NULL &&
697 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
698 (args.next_hop == NULL);
984263bc
MD
699
700 /*
701 * Check for exact addresses in the hash bucket.
702 */
f8983475
SZ
703 LIST_FOREACH(iac, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
704 ia = iac->ia;
705
984263bc
MD
706 /*
707 * If the address matches, verify that the packet
708 * arrived via the correct interface if checking is
709 * enabled.
710 */
dffa46cd 711 if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
984263bc
MD
712 (!checkif || ia->ia_ifp == m->m_pkthdr.rcvif))
713 goto ours;
714 }
f8983475
SZ
715 ia = NULL;
716
984263bc
MD
717 /*
718 * Check for broadcast addresses.
719 *
720 * Only accept broadcast packets that arrive via the matching
721 * interface. Reception of forwarded directed broadcasts would
722 * be handled via ip_forward() and ether_output() with the loopback
723 * into the stack for SIMPLEX interfaces handled by ether_output().
724 */
725 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
b2632176
SZ
726 struct ifaddr_container *ifac;
727
728 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid],
729 ifa_link) {
730 struct ifaddr *ifa = ifac->ifa;
731
83a415f4
MD
732 if (ifa->ifa_addr == NULL) /* shutdown/startup race */
733 continue;
984263bc
MD
734 if (ifa->ifa_addr->sa_family != AF_INET)
735 continue;
736 ia = ifatoia(ifa);
737 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
dffa46cd 738 pkt_dst.s_addr)
984263bc
MD
739 goto ours;
740 if (ia->ia_netbroadcast.s_addr == pkt_dst.s_addr)
741 goto ours;
742#ifdef BOOTP_COMPAT
743 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
744 goto ours;
745#endif
746 }
747 }
748 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
749 struct in_multi *inm;
5fe66e68
JH
750
751 if (ip_mrouter != NULL) {
984263bc
MD
752 /*
753 * If we are acting as a multicast router, all
754 * incoming multicast packets are passed to the
755 * kernel-level multicast forwarding function.
756 * The packet is returned (relatively) intact; if
757 * ip_mforward() returns a non-zero value, the packet
758 * must be discarded, else it may be accepted below.
759 */
5fe66e68 760 if (ip_mforward != NULL &&
dffa46cd 761 ip_mforward(ip, m->m_pkthdr.rcvif, m, NULL) != 0) {
984263bc
MD
762 ipstat.ips_cantforward++;
763 m_freem(m);
764 return;
765 }
766
767 /*
768 * The process-level routing daemon needs to receive
769 * all multicast IGMP packets, whether or not this
770 * host belongs to their destination groups.
771 */
772 if (ip->ip_p == IPPROTO_IGMP)
773 goto ours;
774 ipstat.ips_forward++;
775 }
776 /*
777 * See if we belong to the destination multicast group on the
778 * arrival interface.
779 */
780 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
781 if (inm == NULL) {
782 ipstat.ips_notmember++;
783 m_freem(m);
784 return;
785 }
786 goto ours;
787 }
dffa46cd 788 if (ip->ip_dst.s_addr == INADDR_BROADCAST)
984263bc
MD
789 goto ours;
790 if (ip->ip_dst.s_addr == INADDR_ANY)
791 goto ours;
792
793 /*
794 * FAITH(Firewall Aided Internet Translator)
795 */
796 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
797 if (ip_keepfaith) {
dffa46cd 798 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
984263bc
MD
799 goto ours;
800 }
801 m_freem(m);
802 return;
803 }
804
805 /*
806 * Not for us; forward if possible and desirable.
807 */
dffa46cd 808 if (!ipforwarding) {
984263bc
MD
809 ipstat.ips_cantforward++;
810 m_freem(m);
811 } else {
812#ifdef IPSEC
813 /*
814 * Enforce inbound IPsec SPD.
815 */
816 if (ipsec4_in_reject(m, NULL)) {
817 ipsecstat.in_polvio++;
818 goto bad;
819 }
dffa46cd 820#endif
984263bc
MD
821#ifdef FAST_IPSEC
822 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 823 crit_enter();
984263bc 824 if (mtag != NULL) {
d031aa80 825 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
826 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
827 } else {
828 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 829 IP_FORWARDING, &error);
984263bc
MD
830 }
831 if (sp == NULL) { /* NB: can happen if error */
1cae611f 832 crit_exit();
984263bc
MD
833 /*XXX error stat???*/
834 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
835 goto bad;
836 }
837
838 /*
839 * Check security policy against packet attributes.
840 */
841 error = ipsec_in_reject(sp, m);
842 KEY_FREESP(&sp);
1cae611f 843 crit_exit();
984263bc
MD
844 if (error) {
845 ipstat.ips_cantforward++;
846 goto bad;
847 }
dffa46cd
JH
848#endif
849 ip_forward(m, using_srcrt, args.next_hop);
984263bc
MD
850 }
851 return;
852
853ours:
dffa46cd 854
984263bc
MD
855 /*
856 * IPSTEALTH: Process non-routing options only
857 * if the packet is destined for us.
858 */
dffa46cd
JH
859 if (ipstealth &&
860 hlen > sizeof(struct ip) &&
984263bc
MD
861 ip_dooptions(m, 1, args.next_hop))
862 return;
984263bc
MD
863
864 /* Count the packet in the ip address stats */
865 if (ia != NULL) {
866 ia->ia_ifa.if_ipackets++;
867 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
868 }
869
870 /*
871 * If offset or IP_MF are set, must reassemble.
872 * Otherwise, nothing need be done.
873 * (We could look in the reassembly queue to see
874 * if the packet was previously fragmented,
875 * but it's not worth the time; just let them time out.)
876 */
877 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
878
879 /* If maxnipq is 0, never accept fragments. */
880 if (maxnipq == 0) {
dffa46cd 881 ipstat.ips_fragments++;
984263bc
MD
882 ipstat.ips_fragdropped++;
883 goto bad;
884 }
885
886 sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
887 /*
888 * Look for queue of fragments
889 * of this datagram.
890 */
891 for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next)
892 if (ip->ip_id == fp->ipq_id &&
893 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
894 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
895 ip->ip_p == fp->ipq_p)
896 goto found;
897
dffa46cd 898 fp = NULL;
984263bc
MD
899
900 /*
901 * Enforce upper bound on number of fragmented packets
902 * for which we attempt reassembly;
903 * If maxnipq is -1, accept all fragments without limitation.
904 */
905 if ((nipq > maxnipq) && (maxnipq > 0)) {
dffa46cd
JH
906 /*
907 * drop something from the tail of the current queue
908 * before proceeding further
909 */
910 if (ipq[sum].prev == &ipq[sum]) { /* gak */
911 for (i = 0; i < IPREASS_NHASH; i++) {
912 if (ipq[i].prev != &ipq[i]) {
913 ipstat.ips_fragtimeout +=
914 ipq[i].prev->ipq_nfrags;
915 ip_freef(ipq[i].prev);
916 break;
917 }
918 }
919 } else {
984263bc 920 ipstat.ips_fragtimeout +=
dffa46cd
JH
921 ipq[sum].prev->ipq_nfrags;
922 ip_freef(ipq[sum].prev);
984263bc 923 }
984263bc
MD
924 }
925found:
926 /*
927 * Adjust ip_len to not reflect header,
928 * convert offset of this to bytes.
929 */
930 ip->ip_len -= hlen;
931 if (ip->ip_off & IP_MF) {
dffa46cd
JH
932 /*
933 * Make sure that fragments have a data length
984263bc 934 * that's a non-zero multiple of 8 bytes.
dffa46cd 935 */
984263bc
MD
936 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
937 ipstat.ips_toosmall++; /* XXX */
938 goto bad;
939 }
940 m->m_flags |= M_FRAG;
941 } else
942 m->m_flags &= ~M_FRAG;
943 ip->ip_off <<= 3;
944
945 /*
946 * Attempt reassembly; if it succeeds, proceed.
947 * ip_reass() will return a different mbuf, and update
e5ecc832 948 * the divert info in divert_info.
984263bc
MD
949 */
950 ipstat.ips_fragments++;
951 m->m_pkthdr.header = ip;
e5ecc832 952 m = ip_reass(m, fp, &ipq[sum], &divert_info);
dffa46cd 953 if (m == NULL)
984263bc
MD
954 return;
955 ipstat.ips_reassembled++;
0c7ac0cd 956 needredispatch = TRUE;
984263bc
MD
957 ip = mtod(m, struct ip *);
958 /* Get the header length of the reassembled packet */
959 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
960#ifdef IPDIVERT
961 /* Restore original checksum before diverting packet */
962 if (divert_info != 0) {
963 ip->ip_len += hlen;
964 ip->ip_len = htons(ip->ip_len);
965 ip->ip_off = htons(ip->ip_off);
966 ip->ip_sum = 0;
967 if (hlen == sizeof(struct ip))
968 ip->ip_sum = in_cksum_hdr(ip);
969 else
970 ip->ip_sum = in_cksum(m, hlen);
971 ip->ip_off = ntohs(ip->ip_off);
972 ip->ip_len = ntohs(ip->ip_len);
973 ip->ip_len -= hlen;
974 }
975#endif
bf82f9b7 976 } else {
984263bc 977 ip->ip_len -= hlen;
bf82f9b7 978 }
984263bc
MD
979
980#ifdef IPDIVERT
981 /*
982 * Divert or tee packet to the divert protocol if required.
983 */
984 if (divert_info != 0) {
985 struct mbuf *clone = NULL;
986
987 /* Clone packet if we're doing a 'tee' */
988 if ((divert_info & IP_FW_PORT_TEE_FLAG) != 0)
74f1caca 989 clone = m_dup(m, MB_DONTWAIT);
984263bc
MD
990
991 /* Restore packet header fields to original values */
992 ip->ip_len += hlen;
993 ip->ip_len = htons(ip->ip_len);
994 ip->ip_off = htons(ip->ip_off);
995
996 /* Deliver packet to divert input routine */
e5ecc832 997 divert_packet(m, 1, divert_info & 0xffff);
984263bc
MD
998 ipstat.ips_delivered++;
999
1000 /* If 'tee', continue with original packet */
1001 if (clone == NULL)
1002 return;
1003 m = clone;
1004 ip = mtod(m, struct ip *);
1005 ip->ip_len += hlen;
1006 /*
1007 * Jump backwards to complete processing of the
1008 * packet. But first clear divert_info to avoid
1009 * entering this block again.
1010 * We do not need to clear args.divert_rule
1011 * or args.next_hop as they will not be used.
e5ecc832
JS
1012 *
1013 * XXX Better safe than sorry, remove the DIVERT tag.
984263bc 1014 */
e5ecc832
JS
1015 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1016 if (mtag != NULL)
1017 m_tag_delete(m, mtag);
1018
984263bc
MD
1019 divert_info = 0;
1020 goto pass;
1021 }
1022#endif
1023
1024#ifdef IPSEC
1025 /*
1026 * enforce IPsec policy checking if we are seeing last header.
1027 * note that we do not visit this with protocols with pcb layer
1028 * code - like udp/tcp/raw ip.
1029 */
dffa46cd 1030 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) &&
984263bc
MD
1031 ipsec4_in_reject(m, NULL)) {
1032 ipsecstat.in_polvio++;
1033 goto bad;
1034 }
1035#endif
1036#if FAST_IPSEC
1037 /*
1038 * enforce IPsec policy checking if we are seeing last header.
1039 * note that we do not visit this with protocols with pcb layer
1040 * code - like udp/tcp/raw ip.
1041 */
dffa46cd 1042 if (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) {
984263bc
MD
1043 /*
1044 * Check if the packet has already had IPsec processing
1045 * done. If so, then just pass it along. This tag gets
1046 * set during AH, ESP, etc. input handling, before the
1047 * packet is returned to the ip input queue for delivery.
dffa46cd 1048 */
984263bc 1049 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 1050 crit_enter();
984263bc 1051 if (mtag != NULL) {
d031aa80 1052 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
1053 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1054 } else {
1055 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 1056 IP_FORWARDING, &error);
984263bc
MD
1057 }
1058 if (sp != NULL) {
1059 /*
1060 * Check security policy against packet attributes.
1061 */
1062 error = ipsec_in_reject(sp, m);
1063 KEY_FREESP(&sp);
1064 } else {
1065 /* XXX error stat??? */
1066 error = EINVAL;
1067DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1068 goto bad;
1069 }
1cae611f 1070 crit_exit();
984263bc
MD
1071 if (error)
1072 goto bad;
1073 }
1074#endif /* FAST_IPSEC */
1075
984263bc 1076 ipstat.ips_delivered++;
0c7ac0cd
JH
1077 if (needredispatch) {
1078 struct netmsg_transport_packet *msg;
1079 lwkt_port_t port;
984263bc 1080
35658e20
JH
1081 ip->ip_off = htons(ip->ip_off);
1082 ip->ip_len = htons(ip->ip_len);
934c6849 1083 port = ip_mport_in(&m);
35658e20
JH
1084 if (port == NULL)
1085 return;
1086
efda3bd0 1087 msg = kmalloc(sizeof(struct netmsg_transport_packet), M_LWKTMSG,
35658e20 1088 M_INTWAIT | M_NULLOK);
b76bed62 1089 if (msg == NULL)
0c7ac0cd 1090 goto bad;
b44419cb 1091
4599cf19
MD
1092 netmsg_init(&msg->nm_netmsg, &netisr_afree_rport, 0,
1093 transport_processing_handler);
0c7ac0cd
JH
1094 msg->nm_hlen = hlen;
1095 msg->nm_hasnexthop = (args.next_hop != NULL);
1096 if (msg->nm_hasnexthop)
1097 msg->nm_nexthop = *args.next_hop; /* structure copy */
984263bc 1098
3f030272
JH
1099 msg->nm_mbuf = m;
1100 ip = mtod(m, struct ip *);
1101 ip->ip_len = ntohs(ip->ip_len);
1102 ip->ip_off = ntohs(ip->ip_off);
4599cf19 1103 lwkt_sendmsg(port, &msg->nm_netmsg.nm_lmsg);
0c7ac0cd
JH
1104 } else {
1105 transport_processing_oncpu(m, hlen, ip, args.next_hop);
bf82f9b7 1106 }
984263bc 1107 return;
a80cf23b 1108
984263bc
MD
1109bad:
1110 m_freem(m);
1111}
1112
984263bc
MD
1113/*
1114 * Take incoming datagram fragment and try to reassemble it into
1115 * whole datagram. If a chain for reassembly of this datagram already
1116 * exists, then it is given as fp; otherwise have to make a chain.
1117 *
1118 * When IPDIVERT enabled, keep additional state with each packet that
1119 * tells us if we need to divert or tee the packet we're building.
e5ecc832 1120 * In particular, *divinfo includes the port and TEE flag.
984263bc
MD
1121 */
1122
1123static struct mbuf *
1124ip_reass(struct mbuf *m, struct ipq *fp, struct ipq *where,
e5ecc832 1125 u_int32_t *divinfo)
984263bc
MD
1126{
1127 struct ip *ip = mtod(m, struct ip *);
dffa46cd 1128 struct mbuf *p = NULL, *q, *nq;
2b89bacf 1129 struct mbuf *n;
984263bc
MD
1130 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1131 int i, next;
e5ecc832
JS
1132#ifdef IPDIVERT
1133 struct m_tag *mtag;
1134#endif
984263bc 1135
fbb35ef0
SZ
1136 /*
1137 * If the hardware has not done csum over this fragment
1138 * then csum_data is not valid at all.
1139 */
1140 if ((m->m_pkthdr.csum_flags & (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID))
1141 == (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID)) {
1142 m->m_pkthdr.csum_data = 0;
1143 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
1144 }
1145
984263bc
MD
1146 /*
1147 * Presence of header sizes in mbufs
1148 * would confuse code below.
1149 */
1150 m->m_data += hlen;
1151 m->m_len -= hlen;
1152
1153 /*
1154 * If first fragment to arrive, create a reassembly queue.
1155 */
dffa46cd 1156 if (fp == NULL) {
2b89bacf 1157 if ((fp = mpipe_alloc_nowait(&ipq_mpipe)) == NULL)
984263bc 1158 goto dropfrag;
984263bc
MD
1159 insque(fp, where);
1160 nipq++;
1161 fp->ipq_nfrags = 1;
1162 fp->ipq_ttl = IPFRAGTTL;
1163 fp->ipq_p = ip->ip_p;
1164 fp->ipq_id = ip->ip_id;
1165 fp->ipq_src = ip->ip_src;
1166 fp->ipq_dst = ip->ip_dst;
1167 fp->ipq_frags = m;
1168 m->m_nextpkt = NULL;
1169#ifdef IPDIVERT
1170 fp->ipq_div_info = 0;
984263bc
MD
1171#endif
1172 goto inserted;
1173 } else {
1174 fp->ipq_nfrags++;
1175 }
1176
dffa46cd 1177#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
984263bc
MD
1178
1179 /*
1180 * Find a segment which begins after this one does.
1181 */
1182 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
1183 if (GETIP(q)->ip_off > ip->ip_off)
1184 break;
1185
1186 /*
1187 * If there is a preceding segment, it may provide some of
1188 * our data already. If so, drop the data from the incoming
1189 * segment. If it provides all of our data, drop us, otherwise
1190 * stick new segment in the proper place.
1191 *
1192 * If some of the data is dropped from the the preceding
1193 * segment, then it's checksum is invalidated.
1194 */
1195 if (p) {
1196 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1197 if (i > 0) {
1198 if (i >= ip->ip_len)
1199 goto dropfrag;
1200 m_adj(m, i);
1201 m->m_pkthdr.csum_flags = 0;
1202 ip->ip_off += i;
1203 ip->ip_len -= i;
1204 }
1205 m->m_nextpkt = p->m_nextpkt;
1206 p->m_nextpkt = m;
1207 } else {
1208 m->m_nextpkt = fp->ipq_frags;
1209 fp->ipq_frags = m;
1210 }
1211
1212 /*
1213 * While we overlap succeeding segments trim them or,
1214 * if they are completely covered, dequeue them.
1215 */
1216 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1217 q = nq) {
dffa46cd 1218 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
984263bc
MD
1219 if (i < GETIP(q)->ip_len) {
1220 GETIP(q)->ip_len -= i;
1221 GETIP(q)->ip_off += i;
1222 m_adj(q, i);
1223 q->m_pkthdr.csum_flags = 0;
1224 break;
1225 }
1226 nq = q->m_nextpkt;
1227 m->m_nextpkt = nq;
1228 ipstat.ips_fragdropped++;
1229 fp->ipq_nfrags--;
c4933956 1230 q->m_nextpkt = NULL;
984263bc
MD
1231 m_freem(q);
1232 }
1233
1234inserted:
1235
1236#ifdef IPDIVERT
1237 /*
1238 * Transfer firewall instructions to the fragment structure.
1239 * Only trust info in the fragment at offset 0.
1240 */
1241 if (ip->ip_off == 0) {
1242 fp->ipq_div_info = *divinfo;
e5ecc832
JS
1243 } else {
1244 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1245 if (mtag != NULL)
1246 m_tag_delete(m, mtag);
984263bc
MD
1247 }
1248 *divinfo = 0;
984263bc
MD
1249#endif
1250
1251 /*
1252 * Check for complete reassembly and perform frag per packet
1253 * limiting.
1254 *
1255 * Frag limiting is performed here so that the nth frag has
1256 * a chance to complete the packet before we drop the packet.
1257 * As a result, n+1 frags are actually allowed per packet, but
1258 * only n will ever be stored. (n = maxfragsperpacket.)
1259 *
1260 */
1261 next = 0;
1262 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1263 if (GETIP(q)->ip_off != next) {
1264 if (fp->ipq_nfrags > maxfragsperpacket) {
1265 ipstat.ips_fragdropped += fp->ipq_nfrags;
1266 ip_freef(fp);
1267 }
dffa46cd 1268 return (NULL);
984263bc
MD
1269 }
1270 next += GETIP(q)->ip_len;
1271 }
1272 /* Make sure the last packet didn't have the IP_MF flag */
1273 if (p->m_flags & M_FRAG) {
1274 if (fp->ipq_nfrags > maxfragsperpacket) {
1275 ipstat.ips_fragdropped += fp->ipq_nfrags;
1276 ip_freef(fp);
1277 }
dffa46cd 1278 return (NULL);
984263bc
MD
1279 }
1280
1281 /*
1282 * Reassembly is complete. Make sure the packet is a sane size.
1283 */
1284 q = fp->ipq_frags;
1285 ip = GETIP(q);
1286 if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
1287 ipstat.ips_toolong++;
1288 ipstat.ips_fragdropped += fp->ipq_nfrags;
1289 ip_freef(fp);
dffa46cd 1290 return (NULL);
984263bc
MD
1291 }
1292
1293 /*
1294 * Concatenate fragments.
1295 */
1296 m = q;
2b89bacf 1297 n = m->m_next;
dffa46cd 1298 m->m_next = NULL;
2b89bacf 1299 m_cat(m, n);
984263bc 1300 nq = q->m_nextpkt;
dffa46cd 1301 q->m_nextpkt = NULL;
984263bc
MD
1302 for (q = nq; q != NULL; q = nq) {
1303 nq = q->m_nextpkt;
1304 q->m_nextpkt = NULL;
1305 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1306 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1307 m_cat(m, q);
1308 }
1309
1e7aea7f
MD
1310 /*
1311 * Clean up the 1's complement checksum. Carry over 16 bits must
1312 * be added back. This assumes no more then 65535 packet fragments
37ed010a 1313 * were reassembled. A second carry can also occur (but not a third).
1e7aea7f
MD
1314 */
1315 m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) +
1316 (m->m_pkthdr.csum_data >> 16);
37ed010a
MD
1317 if (m->m_pkthdr.csum_data > 0xFFFF)
1318 m->m_pkthdr.csum_data -= 0xFFFF;
1e7aea7f
MD
1319
1320
984263bc
MD
1321#ifdef IPDIVERT
1322 /*
1323 * Extract firewall instructions from the fragment structure.
1324 */
1325 *divinfo = fp->ipq_div_info;
984263bc
MD
1326#endif
1327
1328 /*
1329 * Create header for new ip packet by
1330 * modifying header of first packet;
1331 * dequeue and discard fragment reassembly header.
1332 * Make header visible.
1333 */
1334 ip->ip_len = next;
1335 ip->ip_src = fp->ipq_src;
1336 ip->ip_dst = fp->ipq_dst;
1337 remque(fp);
1338 nipq--;
2b89bacf 1339 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1340 m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
1341 m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
1342 /* some debugging cruft by sklower, below, will go away soon */
1343 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
2256ba69 1344 int plen = 0;
dffa46cd 1345
2b89bacf
MD
1346 for (n = m; n; n = n->m_next)
1347 plen += n->m_len;
984263bc
MD
1348 m->m_pkthdr.len = plen;
1349 }
1350 return (m);
1351
1352dropfrag:
1353#ifdef IPDIVERT
1354 *divinfo = 0;
984263bc
MD
1355#endif
1356 ipstat.ips_fragdropped++;
dffa46cd 1357 if (fp != NULL)
984263bc
MD
1358 fp->ipq_nfrags--;
1359 m_freem(m);
dffa46cd 1360 return (NULL);
984263bc
MD
1361
1362#undef GETIP
1363}
1364
1365/*
1366 * Free a fragment reassembly header and all
1367 * associated datagrams.
1368 */
1369static void
dffa46cd 1370ip_freef(struct ipq *fp)
984263bc 1371{
2256ba69 1372 struct mbuf *q;
984263bc
MD
1373
1374 while (fp->ipq_frags) {
1375 q = fp->ipq_frags;
1376 fp->ipq_frags = q->m_nextpkt;
c4933956 1377 q->m_nextpkt = NULL;
984263bc
MD
1378 m_freem(q);
1379 }
1380 remque(fp);
2b89bacf 1381 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1382 nipq--;
1383}
1384
1385/*
1386 * IP timer processing;
1387 * if a timer expires on a reassembly
1388 * queue, discard it.
1389 */
1390void
8a3125c6 1391ip_slowtimo(void)
984263bc 1392{
2256ba69 1393 struct ipq *fp;
984263bc
MD
1394 int i;
1395
1cae611f 1396 crit_enter();
984263bc
MD
1397 for (i = 0; i < IPREASS_NHASH; i++) {
1398 fp = ipq[i].next;
dffa46cd 1399 if (fp == NULL)
984263bc
MD
1400 continue;
1401 while (fp != &ipq[i]) {
1402 --fp->ipq_ttl;
1403 fp = fp->next;
1404 if (fp->prev->ipq_ttl == 0) {
1405 ipstat.ips_fragtimeout += fp->prev->ipq_nfrags;
1406 ip_freef(fp->prev);
1407 }
1408 }
1409 }
1410 /*
1411 * If we are over the maximum number of fragments
1412 * (due to the limit being lowered), drain off
1413 * enough to get down to the new limit.
1414 */
1415 if (maxnipq >= 0 && nipq > maxnipq) {
1416 for (i = 0; i < IPREASS_NHASH; i++) {
1417 while (nipq > maxnipq &&
1418 (ipq[i].next != &ipq[i])) {
1419 ipstat.ips_fragdropped +=
1420 ipq[i].next->ipq_nfrags;
1421 ip_freef(ipq[i].next);
1422 }
1423 }
1424 }
1425 ipflow_slowtimo();
1cae611f 1426 crit_exit();
984263bc
MD
1427}
1428
1429/*
1430 * Drain off all datagram fragments.
1431 */
1432void
8a3125c6 1433ip_drain(void)
984263bc 1434{
dffa46cd 1435 int i;
984263bc
MD
1436
1437 for (i = 0; i < IPREASS_NHASH; i++) {
1438 while (ipq[i].next != &ipq[i]) {
1439 ipstat.ips_fragdropped += ipq[i].next->ipq_nfrags;
1440 ip_freef(ipq[i].next);
1441 }
1442 }
1443 in_rtqdrain();
1444}
1445
1446/*
1447 * Do option processing on a datagram,
1448 * possibly discarding it if bad options are encountered,
1449 * or forwarding it if source-routed.
1450 * The pass argument is used when operating in the IPSTEALTH
1451 * mode to tell what options to process:
1452 * [LS]SRR (pass 0) or the others (pass 1).
1453 * The reason for as many as two passes is that when doing IPSTEALTH,
1454 * non-routing options should be processed only if the packet is for us.
1455 * Returns 1 if packet has been forwarded/freed,
1456 * 0 if the packet should be processed further.
1457 */
1458static int
1459ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop)
1460{
407e896e 1461 struct sockaddr_in ipaddr = { sizeof ipaddr, AF_INET };
984263bc
MD
1462 struct ip *ip = mtod(m, struct ip *);
1463 u_char *cp;
1464 struct in_ifaddr *ia;
dffa46cd
JH
1465 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB;
1466 boolean_t forward = FALSE;
984263bc
MD
1467 struct in_addr *sin, dst;
1468 n_time ntime;
1469
1470 dst = ip->ip_dst;
1471 cp = (u_char *)(ip + 1);
dffa46cd 1472 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1473 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1474 opt = cp[IPOPT_OPTVAL];
1475 if (opt == IPOPT_EOL)
1476 break;
1477 if (opt == IPOPT_NOP)
1478 optlen = 1;
1479 else {
1480 if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1481 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1482 goto bad;
1483 }
1484 optlen = cp[IPOPT_OLEN];
1485 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1486 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1487 goto bad;
1488 }
1489 }
1490 switch (opt) {
1491
1492 default:
1493 break;
1494
1495 /*
1496 * Source routing with record.
1497 * Find interface with current destination address.
1498 * If none on this machine then drop if strictly routed,
1499 * or do nothing if loosely routed.
1500 * Record interface address and bring up next address
1501 * component. If strictly routed make sure next
1502 * address is on directly accessible net.
1503 */
1504 case IPOPT_LSRR:
1505 case IPOPT_SSRR:
984263bc
MD
1506 if (ipstealth && pass > 0)
1507 break;
984263bc
MD
1508 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1509 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1510 goto bad;
1511 }
1512 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1513 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1514 goto bad;
1515 }
1516 ipaddr.sin_addr = ip->ip_dst;
1517 ia = (struct in_ifaddr *)
1518 ifa_ifwithaddr((struct sockaddr *)&ipaddr);
dffa46cd 1519 if (ia == NULL) {
984263bc
MD
1520 if (opt == IPOPT_SSRR) {
1521 type = ICMP_UNREACH;
1522 code = ICMP_UNREACH_SRCFAIL;
1523 goto bad;
1524 }
1525 if (!ip_dosourceroute)
1526 goto nosourcerouting;
1527 /*
1528 * Loose routing, and not at next destination
1529 * yet; nothing to do except forward.
1530 */
1531 break;
1532 }
1533 off--; /* 0 origin */
1534 if (off > optlen - (int)sizeof(struct in_addr)) {
1535 /*
1536 * End of source route. Should be for us.
1537 */
1538 if (!ip_acceptsourceroute)
1539 goto nosourcerouting;
1540 save_rte(cp, ip->ip_src);
1541 break;
1542 }
984263bc
MD
1543 if (ipstealth)
1544 goto dropit;
984263bc
MD
1545 if (!ip_dosourceroute) {
1546 if (ipforwarding) {
1141eb20
JH
1547 char buf[sizeof "aaa.bbb.ccc.ddd"];
1548
984263bc
MD
1549 /*
1550 * Acting as a router, so generate ICMP
1551 */
1552nosourcerouting:
1553 strcpy(buf, inet_ntoa(ip->ip_dst));
dffa46cd 1554 log(LOG_WARNING,
984263bc
MD
1555 "attempted source route from %s to %s\n",
1556 inet_ntoa(ip->ip_src), buf);
1557 type = ICMP_UNREACH;
1558 code = ICMP_UNREACH_SRCFAIL;
1559 goto bad;
1560 } else {
1561 /*
dffa46cd
JH
1562 * Not acting as a router,
1563 * so silently drop.
984263bc 1564 */
984263bc 1565dropit:
984263bc
MD
1566 ipstat.ips_cantforward++;
1567 m_freem(m);
1568 return (1);
1569 }
1570 }
1571
1572 /*
1573 * locate outgoing interface
1574 */
f23061d4
JH
1575 memcpy(&ipaddr.sin_addr, cp + off,
1576 sizeof ipaddr.sin_addr);
984263bc
MD
1577
1578 if (opt == IPOPT_SSRR) {
1579#define INA struct in_ifaddr *
1580#define SA struct sockaddr *
dffa46cd
JH
1581 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr))
1582 == NULL)
1583 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
984263bc 1584 } else
ecdefdda
MD
1585 ia = ip_rtaddr(ipaddr.sin_addr,
1586 &ipforward_rt[mycpuid]);
dffa46cd 1587 if (ia == NULL) {
984263bc
MD
1588 type = ICMP_UNREACH;
1589 code = ICMP_UNREACH_SRCFAIL;
1590 goto bad;
1591 }
1592 ip->ip_dst = ipaddr.sin_addr;
f23061d4 1593 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1594 sizeof(struct in_addr));
1595 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1596 /*
1597 * Let ip_intr's mcast routing check handle mcast pkts
1598 */
1599 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
1600 break;
1601
1602 case IPOPT_RR:
984263bc
MD
1603 if (ipstealth && pass == 0)
1604 break;
984263bc
MD
1605 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1606 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1607 goto bad;
1608 }
1609 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1610 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1611 goto bad;
1612 }
1613 /*
1614 * If no space remains, ignore.
1615 */
1616 off--; /* 0 origin */
1617 if (off > optlen - (int)sizeof(struct in_addr))
1618 break;
f23061d4
JH
1619 memcpy(&ipaddr.sin_addr, &ip->ip_dst,
1620 sizeof ipaddr.sin_addr);
984263bc
MD
1621 /*
1622 * locate outgoing interface; if we're the destination,
1623 * use the incoming interface (should be same).
1624 */
dffa46cd 1625 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
ecdefdda
MD
1626 (ia = ip_rtaddr(ipaddr.sin_addr,
1627 &ipforward_rt[mycpuid]))
dffa46cd 1628 == NULL) {
984263bc
MD
1629 type = ICMP_UNREACH;
1630 code = ICMP_UNREACH_HOST;
1631 goto bad;
1632 }
f23061d4 1633 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1634 sizeof(struct in_addr));
1635 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1636 break;
1637
1638 case IPOPT_TS:
984263bc
MD
1639 if (ipstealth && pass == 0)
1640 break;
984263bc
MD
1641 code = cp - (u_char *)ip;
1642 if (optlen < 4 || optlen > 40) {
1643 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1644 goto bad;
1645 }
1646 if ((off = cp[IPOPT_OFFSET]) < 5) {
1647 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1648 goto bad;
1649 }
1650 if (off > optlen - (int)sizeof(int32_t)) {
1651 cp[IPOPT_OFFSET + 1] += (1 << 4);
1652 if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
1653 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1654 goto bad;
1655 }
1656 break;
1657 }
1658 off--; /* 0 origin */
1659 sin = (struct in_addr *)(cp + off);
1660 switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
1661
1662 case IPOPT_TS_TSONLY:
1663 break;
1664
1665 case IPOPT_TS_TSANDADDR:
1666 if (off + sizeof(n_time) +
1667 sizeof(struct in_addr) > optlen) {
1668 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1669 goto bad;
1670 }
1671 ipaddr.sin_addr = dst;
1672 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
1673 m->m_pkthdr.rcvif);
dffa46cd 1674 if (ia == NULL)
984263bc 1675 continue;
f23061d4 1676 memcpy(sin, &IA_SIN(ia)->sin_addr,
984263bc
MD
1677 sizeof(struct in_addr));
1678 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1679 off += sizeof(struct in_addr);
1680 break;
1681
1682 case IPOPT_TS_PRESPEC:
1683 if (off + sizeof(n_time) +
1684 sizeof(struct in_addr) > optlen) {
1685 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1686 goto bad;
1687 }
f23061d4 1688 memcpy(&ipaddr.sin_addr, sin,
984263bc 1689 sizeof(struct in_addr));
dffa46cd 1690 if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
984263bc
MD
1691 continue;
1692 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1693 off += sizeof(struct in_addr);
1694 break;
1695
1696 default:
1697 code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
1698 goto bad;
1699 }
1700 ntime = iptime();
f23061d4 1701 memcpy(cp + off, &ntime, sizeof(n_time));
984263bc
MD
1702 cp[IPOPT_OFFSET] += sizeof(n_time);
1703 }
1704 }
1705 if (forward && ipforwarding) {
41332872 1706 ip_forward(m, TRUE, next_hop);
984263bc
MD
1707 return (1);
1708 }
1709 return (0);
1710bad:
981773b8 1711 icmp_error(m, type, code, 0, 0);
984263bc
MD
1712 ipstat.ips_badoptions++;
1713 return (1);
1714}
1715
1716/*
1717 * Given address of next destination (final or next hop),
1718 * return internet address info of interface to be used to get there.
1719 */
1720struct in_ifaddr *
41332872 1721ip_rtaddr(struct in_addr dst, struct route *ro)
984263bc 1722{
2256ba69 1723 struct sockaddr_in *sin;
984263bc 1724
41332872 1725 sin = (struct sockaddr_in *)&ro->ro_dst;
984263bc 1726
41332872
JH
1727 if (ro->ro_rt == NULL || dst.s_addr != sin->sin_addr.s_addr) {
1728 if (ro->ro_rt != NULL) {
1729 RTFREE(ro->ro_rt);
1730 ro->ro_rt = NULL;
984263bc
MD
1731 }
1732 sin->sin_family = AF_INET;
5fe66e68 1733 sin->sin_len = sizeof *sin;
984263bc 1734 sin->sin_addr = dst;
41332872 1735 rtalloc_ign(ro, RTF_PRCLONING);
984263bc 1736 }
dffa46cd 1737
41332872 1738 if (ro->ro_rt == NULL)
dffa46cd
JH
1739 return (NULL);
1740
41332872 1741 return (ifatoia(ro->ro_rt->rt_ifa));
984263bc
MD
1742}
1743
1744/*
1745 * Save incoming source route for use in replies,
1746 * to be picked up later by ip_srcroute if the receiver is interested.
1747 */
1748void
dffa46cd 1749save_rte(u_char *option, struct in_addr dst)
984263bc
MD
1750{
1751 unsigned olen;
1752
1753 olen = option[IPOPT_OLEN];
1754#ifdef DIAGNOSTIC
1755 if (ipprintfs)
a6ec04bc 1756 kprintf("save_rte: olen %d\n", olen);
984263bc
MD
1757#endif
1758 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1759 return;
1760 bcopy(option, ip_srcrt.srcopt, olen);
1761 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1762 ip_srcrt.dst = dst;
1763}
1764
1765/*
1766 * Retrieve incoming source route for use in replies,
1767 * in the same form used by setsockopt.
1768 * The first hop is placed before the options, will be removed later.
1769 */
1770struct mbuf *
8a3125c6 1771ip_srcroute(void)
984263bc 1772{
2256ba69
RG
1773 struct in_addr *p, *q;
1774 struct mbuf *m;
984263bc
MD
1775
1776 if (ip_nhops == 0)
dffa46cd 1777 return (NULL);
74f1caca 1778 m = m_get(MB_DONTWAIT, MT_HEADER);
dffa46cd
JH
1779 if (m == NULL)
1780 return (NULL);
984263bc 1781
dffa46cd 1782#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
984263bc
MD
1783
1784 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1785 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1786 OPTSIZ;
1787#ifdef DIAGNOSTIC
1788 if (ipprintfs)
a6ec04bc 1789 kprintf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
984263bc
MD
1790#endif
1791
1792 /*
1793 * First save first hop for return route
1794 */
1795 p = &ip_srcrt.route[ip_nhops - 1];
1796 *(mtod(m, struct in_addr *)) = *p--;
1797#ifdef DIAGNOSTIC
1798 if (ipprintfs)
a6ec04bc 1799 kprintf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
984263bc
MD
1800#endif
1801
1802 /*
1803 * Copy option fields and padding (nop) to mbuf.
1804 */
1805 ip_srcrt.nop = IPOPT_NOP;
1806 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
f23061d4 1807 memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &ip_srcrt.nop,
dffa46cd 1808 OPTSIZ);
984263bc
MD
1809 q = (struct in_addr *)(mtod(m, caddr_t) +
1810 sizeof(struct in_addr) + OPTSIZ);
1811#undef OPTSIZ
1812 /*
1813 * Record return path as an IP source route,
1814 * reversing the path (pointers are now aligned).
1815 */
1816 while (p >= ip_srcrt.route) {
1817#ifdef DIAGNOSTIC
1818 if (ipprintfs)
a6ec04bc 1819 kprintf(" %x", ntohl(q->s_addr));
984263bc
MD
1820#endif
1821 *q++ = *p--;
1822 }
1823 /*
1824 * Last hop goes to final destination.
1825 */
1826 *q = ip_srcrt.dst;
1827#ifdef DIAGNOSTIC
1828 if (ipprintfs)
a6ec04bc 1829 kprintf(" %x\n", ntohl(q->s_addr));
984263bc
MD
1830#endif
1831 return (m);
1832}
1833
1834/*
bddf0751 1835 * Strip out IP options.
984263bc
MD
1836 */
1837void
bddf0751 1838ip_stripoptions(struct mbuf *m)
984263bc 1839{
bddf0751 1840 int datalen;
984263bc 1841 struct ip *ip = mtod(m, struct ip *);
2256ba69 1842 caddr_t opts;
bddf0751 1843 int optlen;
984263bc 1844
bddf0751 1845 optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc 1846 opts = (caddr_t)(ip + 1);
bddf0751
JH
1847 datalen = m->m_len - (sizeof(struct ip) + optlen);
1848 bcopy(opts + optlen, opts, datalen);
1849 m->m_len -= optlen;
984263bc 1850 if (m->m_flags & M_PKTHDR)
bddf0751 1851 m->m_pkthdr.len -= optlen;
984263bc
MD
1852 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
1853}
1854
1855u_char inetctlerrmap[PRC_NCMDS] = {
1856 0, 0, 0, 0,
1857 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1858 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1859 EMSGSIZE, EHOSTUNREACH, 0, 0,
1860 0, 0, 0, 0,
1861 ENOPROTOOPT, ECONNREFUSED
1862};
1863
1864/*
1865 * Forward a packet. If some error occurs return the sender
1866 * an icmp packet. Note we can't always generate a meaningful
1867 * icmp message because icmp doesn't have a large enough repertoire
1868 * of codes and types.
1869 *
1870 * If not forwarding, just drop the packet. This could be confusing
1871 * if ipforwarding was zero but some routing protocol was advancing
1872 * us as a gateway to somewhere. However, we must let the routing
1873 * protocol deal with that.
1874 *
dffa46cd 1875 * The using_srcrt parameter indicates whether the packet is being forwarded
984263bc
MD
1876 * via a source route.
1877 */
33cc7bb1 1878void
41332872 1879ip_forward(struct mbuf *m, boolean_t using_srcrt, struct sockaddr_in *next_hop)
984263bc
MD
1880{
1881 struct ip *ip = mtod(m, struct ip *);
00392387 1882 struct sockaddr_in *ipforward_rtaddr;
984263bc 1883 struct rtentry *rt;
981773b8 1884 int error, type = 0, code = 0, destmtu = 0;
984263bc
MD
1885 struct mbuf *mcopy;
1886 n_long dest;
1887 struct in_addr pkt_dst;
dffa46cd 1888 struct m_hdr tag;
ecdefdda 1889 struct route *cache_rt = &ipforward_rt[mycpuid];
984263bc 1890
be23faf1 1891 dest = INADDR_ANY;
984263bc
MD
1892 /*
1893 * Cache the destination address of the packet; this may be
1894 * changed by use of 'ipfw fwd'.
1895 */
5fe66e68 1896 pkt_dst = (next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
1897
1898#ifdef DIAGNOSTIC
1899 if (ipprintfs)
a6ec04bc 1900 kprintf("forward: src %x dst %x ttl %x\n",
dffa46cd 1901 ip->ip_src.s_addr, pkt_dst.s_addr, ip->ip_ttl);
984263bc
MD
1902#endif
1903
dffa46cd 1904 if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) {
984263bc
MD
1905 ipstat.ips_cantforward++;
1906 m_freem(m);
1907 return;
1908 }
dffa46cd 1909 if (!ipstealth && ip->ip_ttl <= IPTTLDEC) {
981773b8 1910 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
dffa46cd 1911 return;
984263bc 1912 }
984263bc 1913
ecdefdda
MD
1914 ipforward_rtaddr = (struct sockaddr_in *) &cache_rt->ro_dst;
1915 if (cache_rt->ro_rt == NULL ||
00392387 1916 ipforward_rtaddr->sin_addr.s_addr != pkt_dst.s_addr) {
ecdefdda
MD
1917 if (cache_rt->ro_rt != NULL) {
1918 RTFREE(cache_rt->ro_rt);
1919 cache_rt->ro_rt = NULL;
984263bc 1920 }
00392387
JH
1921 ipforward_rtaddr->sin_family = AF_INET;
1922 ipforward_rtaddr->sin_len = sizeof(struct sockaddr_in);
1923 ipforward_rtaddr->sin_addr = pkt_dst;
ecdefdda
MD
1924 rtalloc_ign(cache_rt, RTF_PRCLONING);
1925 if (cache_rt->ro_rt == NULL) {
981773b8 1926 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
984263bc
MD
1927 return;
1928 }
984263bc 1929 }
ecdefdda 1930 rt = cache_rt->ro_rt;
984263bc
MD
1931
1932 /*
1933 * Save the IP header and at most 8 bytes of the payload,
1934 * in case we need to generate an ICMP message to the src.
1935 *
1936 * XXX this can be optimized a lot by saving the data in a local
1937 * buffer on the stack (72 bytes at most), and only allocating the
1938 * mbuf if really necessary. The vast majority of the packets
1939 * are forwarded without having to send an ICMP back (either
1940 * because unnecessary, or because rate limited), so we are
1941 * really we are wasting a lot of work here.
1942 *
1943 * We don't use m_copy() because it might return a reference
1944 * to a shared cluster. Both this function and ip_output()
1945 * assume exclusive access to the IP header in `m', so any
1946 * data in a cluster may change before we reach icmp_error().
1947 */
85c8d4e6 1948 MGETHDR(mcopy, MB_DONTWAIT, m->m_type);
74f1caca 1949 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, MB_DONTWAIT)) {
984263bc
MD
1950 /*
1951 * It's probably ok if the pkthdr dup fails (because
1952 * the deep copy of the tag chain failed), but for now
1953 * be conservative and just discard the copy since
1954 * code below may some day want the tags.
1955 */
1956 m_free(mcopy);
1957 mcopy = NULL;
1958 }
1959 if (mcopy != NULL) {
1960 mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
1961 (int)ip->ip_len);
52560a13 1962 mcopy->m_pkthdr.len = mcopy->m_len;
984263bc
MD
1963 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1964 }
1965
dffa46cd 1966 if (!ipstealth)
984263bc 1967 ip->ip_ttl -= IPTTLDEC;
984263bc
MD
1968
1969 /*
1970 * If forwarding packet using same interface that it came in on,
1971 * perhaps should send a redirect to sender to shortcut a hop.
1972 * Only send redirect if source is sending directly to us,
1973 * and if packet was not source routed (or has any options).
1974 * Also, don't send redirect if forwarding using a default route
1975 * or a route modified by a redirect.
1976 */
1977 if (rt->rt_ifp == m->m_pkthdr.rcvif &&
dffa46cd
JH
1978 !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) &&
1979 satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY &&
983015c8 1980 ipsendredirects && !using_srcrt && next_hop == NULL) {
984263bc 1981 u_long src = ntohl(ip->ip_src.s_addr);
41332872 1982 struct in_ifaddr *rt_ifa = (struct in_ifaddr *)rt->rt_ifa;
984263bc 1983
41332872
JH
1984 if (rt_ifa != NULL &&
1985 (src & rt_ifa->ia_subnetmask) == rt_ifa->ia_subnet) {
dffa46cd
JH
1986 if (rt->rt_flags & RTF_GATEWAY)
1987 dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1988 else
1989 dest = pkt_dst.s_addr;
1990 /*
1991 * Router requirements says to only send
1992 * host redirects.
1993 */
1994 type = ICMP_REDIRECT;
1995 code = ICMP_REDIRECT_HOST;
984263bc 1996#ifdef DIAGNOSTIC
dffa46cd 1997 if (ipprintfs)
a6ec04bc 1998 kprintf("redirect (%d) to %x\n", code, dest);
984263bc
MD
1999#endif
2000 }
2001 }
2002
5fe66e68 2003 if (next_hop != NULL) {
984263bc 2004 /* Pass IPFORWARD info if available */
984263bc
MD
2005 tag.mh_type = MT_TAG;
2006 tag.mh_flags = PACKET_TAG_IPFORWARD;
2007 tag.mh_data = (caddr_t)next_hop;
2008 tag.mh_next = m;
2009 m = (struct mbuf *)&tag;
2010 }
dffa46cd 2011
ecdefdda
MD
2012 error = ip_output(m, NULL, cache_rt, IP_FORWARDING, NULL,
2013 NULL);
41332872 2014 if (error == 0) {
984263bc 2015 ipstat.ips_forward++;
41332872 2016 if (type == 0) {
984263bc 2017 if (mcopy) {
ecdefdda 2018 ipflow_create(cache_rt, mcopy);
297c8124 2019 m_freem(mcopy);
984263bc 2020 }
41332872
JH
2021 return; /* most common case */
2022 } else {
2023 ipstat.ips_redirectsent++;
984263bc 2024 }
41332872
JH
2025 } else {
2026 ipstat.ips_cantforward++;
984263bc 2027 }
41332872 2028
984263bc
MD
2029 if (mcopy == NULL)
2030 return;
41332872
JH
2031
2032 /*
2033 * Send ICMP message.
2034 */
984263bc
MD
2035
2036 switch (error) {
2037
2038 case 0: /* forwarded, but need redirect */
2039 /* type, code set above */
2040 break;
2041
2042 case ENETUNREACH: /* shouldn't happen, checked above */
2043 case EHOSTUNREACH:
2044 case ENETDOWN:
2045 case EHOSTDOWN:
2046 default:
2047 type = ICMP_UNREACH;
2048 code = ICMP_UNREACH_HOST;
2049 break;
2050
2051 case EMSGSIZE:
2052 type = ICMP_UNREACH;
2053 code = ICMP_UNREACH_NEEDFRAG;
2054#ifdef IPSEC
2055 /*
2056 * If the packet is routed over IPsec tunnel, tell the
2057 * originator the tunnel MTU.
2058 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2059 * XXX quickhack!!!
2060 */
ecdefdda 2061 if (cache_rt->ro_rt != NULL) {
984263bc
MD
2062 struct secpolicy *sp = NULL;
2063 int ipsecerror;
2064 int ipsechdr;
2065 struct route *ro;
2066
2067 sp = ipsec4_getpolicybyaddr(mcopy,
2068 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2069 IP_FORWARDING,
2070 &ipsecerror);
984263bc
MD
2071
2072 if (sp == NULL)
ecdefdda 2073 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2074 else {
2075 /* count IPsec header size */
2076 ipsechdr = ipsec4_hdrsiz(mcopy,
2077 IPSEC_DIR_OUTBOUND,
2078 NULL);
2079
2080 /*
2081 * find the correct route for outer IPv4
2082 * header, compute tunnel MTU.
2083 *
984263bc 2084 */
012d77ea
JH
2085 if (sp->req != NULL && sp->req->sav != NULL &&
2086 sp->req->sav->sah != NULL) {
984263bc 2087 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2088 if (ro->ro_rt != NULL &&
2089 ro->ro_rt->rt_ifp != NULL) {
981773b8 2090 destmtu =
984263bc 2091 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2092 destmtu -= ipsechdr;
984263bc
MD
2093 }
2094 }
2095
2096 key_freesp(sp);
2097 }
2098 }
2099#elif FAST_IPSEC
2100 /*
2101 * If the packet is routed over IPsec tunnel, tell the
2102 * originator the tunnel MTU.
2103 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2104 * XXX quickhack!!!
2105 */
ecdefdda 2106 if (cache_rt->ro_rt != NULL) {
984263bc
MD
2107 struct secpolicy *sp = NULL;
2108 int ipsecerror;
2109 int ipsechdr;
2110 struct route *ro;
2111
2112 sp = ipsec_getpolicybyaddr(mcopy,
2113 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2114 IP_FORWARDING,
2115 &ipsecerror);
984263bc
MD
2116
2117 if (sp == NULL)
ecdefdda 2118 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2119 else {
2120 /* count IPsec header size */
2121 ipsechdr = ipsec4_hdrsiz(mcopy,
2122 IPSEC_DIR_OUTBOUND,
2123 NULL);
2124
2125 /*
2126 * find the correct route for outer IPv4
2127 * header, compute tunnel MTU.
984263bc 2128 */
981773b8 2129
012d77ea
JH
2130 if (sp->req != NULL &&
2131 sp->req->sav != NULL &&
2132 sp->req->sav->sah != NULL) {
984263bc 2133 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2134 if (ro->ro_rt != NULL &&
2135 ro->ro_rt->rt_ifp != NULL) {
981773b8 2136 destmtu =
984263bc 2137 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2138 destmtu -= ipsechdr;
984263bc
MD
2139 }
2140 }
2141
2142 KEY_FREESP(&sp);
2143 }
2144 }
2145#else /* !IPSEC && !FAST_IPSEC */
ecdefdda
MD
2146 if (cache_rt->ro_rt != NULL)
2147 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2148#endif /*IPSEC*/
2149 ipstat.ips_cantfrag++;
2150 break;
2151
2152 case ENOBUFS:
2153 /*
2154 * A router should not generate ICMP_SOURCEQUENCH as
2155 * required in RFC1812 Requirements for IP Version 4 Routers.
2156 * Source quench could be a big problem under DoS attacks,
2157 * or if the underlying interface is rate-limited.
2158 * Those who need source quench packets may re-enable them
2159 * via the net.inet.ip.sendsourcequench sysctl.
2160 */
dffa46cd 2161 if (!ip_sendsourcequench) {
984263bc
MD
2162 m_freem(mcopy);
2163 return;
2164 } else {
2165 type = ICMP_SOURCEQUENCH;
2166 code = 0;
2167 }
2168 break;
2169
2170 case EACCES: /* ipfw denied packet */
2171 m_freem(mcopy);
2172 return;
2173 }
981773b8 2174 icmp_error(mcopy, type, code, dest, destmtu);
984263bc
MD
2175}
2176
2177void
dffa46cd
JH
2178ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2179 struct mbuf *m)
984263bc
MD
2180{
2181 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2182 struct timeval tv;
2183
2184 microtime(&tv);
2185 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
dffa46cd 2186 SCM_TIMESTAMP, SOL_SOCKET);
984263bc
MD
2187 if (*mp)
2188 mp = &(*mp)->m_next;
2189 }
2190 if (inp->inp_flags & INP_RECVDSTADDR) {
2191 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2192 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2193 if (*mp)
2194 mp = &(*mp)->m_next;
2195 }
95926362
MD
2196 if (inp->inp_flags & INP_RECVTTL) {
2197 *mp = sbcreatecontrol((caddr_t) &ip->ip_ttl,
2198 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
2199 if (*mp)
2200 mp = &(*mp)->m_next;
2201 }
984263bc
MD
2202#ifdef notyet
2203 /* XXX
2204 * Moving these out of udp_input() made them even more broken
2205 * than they already were.
2206 */
2207 /* options were tossed already */
2208 if (inp->inp_flags & INP_RECVOPTS) {
2209 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2210 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2211 if (*mp)
2212 mp = &(*mp)->m_next;
2213 }
2214 /* ip_srcroute doesn't do what we want here, need to fix */
2215 if (inp->inp_flags & INP_RECVRETOPTS) {
2216 *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2217 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2218 if (*mp)
2219 mp = &(*mp)->m_next;
2220 }
2221#endif
2222 if (inp->inp_flags & INP_RECVIF) {
2223 struct ifnet *ifp;
2224 struct sdlbuf {
2225 struct sockaddr_dl sdl;
2226 u_char pad[32];
2227 } sdlbuf;
2228 struct sockaddr_dl *sdp;
2229 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
2230
dffa46cd
JH
2231 if (((ifp = m->m_pkthdr.rcvif)) &&
2232 ((ifp->if_index != 0) && (ifp->if_index <= if_index))) {
f2682cb9 2233 sdp = IF_LLSOCKADDR(ifp);
984263bc
MD
2234 /*
2235 * Change our mind and don't try copy.
2236 */
dffa46cd
JH
2237 if ((sdp->sdl_family != AF_LINK) ||
2238 (sdp->sdl_len > sizeof(sdlbuf))) {
984263bc
MD
2239 goto makedummy;
2240 }
2241 bcopy(sdp, sdl2, sdp->sdl_len);
2242 } else {
dffa46cd
JH
2243makedummy:
2244 sdl2->sdl_len =
2245 offsetof(struct sockaddr_dl, sdl_data[0]);
984263bc
MD
2246 sdl2->sdl_family = AF_LINK;
2247 sdl2->sdl_index = 0;
2248 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
2249 }
2250 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
2251 IP_RECVIF, IPPROTO_IP);
2252 if (*mp)
2253 mp = &(*mp)->m_next;
2254 }
2255}
2256
2257/*
2258 * XXX these routines are called from the upper part of the kernel.
2259 *
2260 * They could also be moved to ip_mroute.c, since all the RSVP
2261 * handling is done there already.
2262 */
2263int
2264ip_rsvp_init(struct socket *so)
2265{
2266 if (so->so_type != SOCK_RAW ||
2267 so->so_proto->pr_protocol != IPPROTO_RSVP)
2268 return EOPNOTSUPP;
2269
2270 if (ip_rsvpd != NULL)
2271 return EADDRINUSE;
2272
2273 ip_rsvpd = so;
2274 /*
2275 * This may seem silly, but we need to be sure we don't over-increment
2276 * the RSVP counter, in case something slips up.
2277 */
2278 if (!ip_rsvp_on) {
2279 ip_rsvp_on = 1;
2280 rsvp_on++;
2281 }
2282
2283 return 0;
2284}
2285
2286int
2287ip_rsvp_done(void)
2288{
2289 ip_rsvpd = NULL;
2290 /*
2291 * This may seem silly, but we need to be sure we don't over-decrement
2292 * the RSVP counter, in case something slips up.
2293 */
2294 if (ip_rsvp_on) {
2295 ip_rsvp_on = 0;
2296 rsvp_on--;
2297 }
2298 return 0;
2299}
2300
2301void
a00138cb 2302rsvp_input(struct mbuf *m, ...) /* XXX must fixup manually */
984263bc 2303{
a00138cb
JS
2304 int off, proto;
2305 __va_list ap;
2306
2307 __va_start(ap, m);
2308 off = __va_arg(ap, int);
2309 proto = __va_arg(ap, int);
2310 __va_end(ap);
2311
984263bc
MD
2312 if (rsvp_input_p) { /* call the real one if loaded */
2313 rsvp_input_p(m, off, proto);
2314 return;
2315 }
2316
2317 /* Can still get packets with rsvp_on = 0 if there is a local member
2318 * of the group to which the RSVP packet is addressed. But in this
2319 * case we want to throw the packet away.
2320 */
2321
2322 if (!rsvp_on) {
2323 m_freem(m);
2324 return;
2325 }
2326
dffa46cd 2327 if (ip_rsvpd != NULL) {
984263bc
MD
2328 rip_input(m, off, proto);
2329 return;
2330 }
2331 /* Drop the packet */
2332 m_freem(m);
2333}