Use a larger initial window size when restarting after a long idle period.
[dragonfly.git] / sys / netinet / ip_input.c
CommitLineData
984263bc 1/*
66d6c637
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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
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5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
66d6c637
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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
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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
34/*
35 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
36 *
37 * License terms: all terms for the DragonFly license above plus the following:
38 *
39 * 4. All advertising materials mentioning features or use of this software
40 * must display the following acknowledgement:
41 *
42 * This product includes software developed by Jeffrey M. Hsu
43 * for the DragonFly Project.
44 *
45 * This requirement may be waived with permission from Jeffrey Hsu.
46 * This requirement will sunset and may be removed on July 8 2005,
47 * after which the standard DragonFly license (as shown above) will
48 * apply.
49 */
50
51/*
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52 * Copyright (c) 1982, 1986, 1988, 1993
53 * The Regents of the University of California. All rights reserved.
54 *
55 * Redistribution and use in source and binary forms, with or without
56 * modification, are permitted provided that the following conditions
57 * are met:
58 * 1. Redistributions of source code must retain the above copyright
59 * notice, this list of conditions and the following disclaimer.
60 * 2. Redistributions in binary form must reproduce the above copyright
61 * notice, this list of conditions and the following disclaimer in the
62 * documentation and/or other materials provided with the distribution.
63 * 3. All advertising materials mentioning features or use of this software
64 * must display the following acknowledgement:
65 * This product includes software developed by the University of
66 * California, Berkeley and its contributors.
67 * 4. Neither the name of the University nor the names of its contributors
68 * may be used to endorse or promote products derived from this software
69 * without specific prior written permission.
70 *
71 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
72 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
73 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
74 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
75 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
76 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
77 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
78 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
79 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
80 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
81 * SUCH DAMAGE.
82 *
83 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
84 * $FreeBSD: src/sys/netinet/ip_input.c,v 1.130.2.52 2003/03/07 07:01:28 silby Exp $
e5ecc832 85 * $DragonFly: src/sys/netinet/ip_input.c,v 1.49 2005/04/18 14:26:57 joerg Exp $
984263bc
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86 */
87
88#define _IP_VHL
89
90#include "opt_bootp.h"
91#include "opt_ipfw.h"
92#include "opt_ipdn.h"
93#include "opt_ipdivert.h"
94#include "opt_ipfilter.h"
95#include "opt_ipstealth.h"
96#include "opt_ipsec.h"
97#include "opt_random_ip_id.h"
98
99#include <sys/param.h>
100#include <sys/systm.h>
101#include <sys/mbuf.h>
102#include <sys/malloc.h>
2b89bacf 103#include <sys/mpipe.h>
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104#include <sys/domain.h>
105#include <sys/protosw.h>
106#include <sys/socket.h>
107#include <sys/time.h>
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108#include <sys/globaldata.h>
109#include <sys/thread.h>
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110#include <sys/kernel.h>
111#include <sys/syslog.h>
112#include <sys/sysctl.h>
3f9db7f8 113#include <sys/in_cksum.h>
984263bc 114
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115#include <sys/thread2.h>
116#include <sys/msgport2.h>
117
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118#include <machine/stdarg.h>
119
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120#include <net/if.h>
121#include <net/if_types.h>
122#include <net/if_var.h>
123#include <net/if_dl.h>
e7e55f42 124#include <net/pfil.h>
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125#include <net/route.h>
126#include <net/netisr.h>
127#include <net/intrq.h>
128
129#include <netinet/in.h>
130#include <netinet/in_systm.h>
131#include <netinet/in_var.h>
132#include <netinet/ip.h>
133#include <netinet/in_pcb.h>
134#include <netinet/ip_var.h>
135#include <netinet/ip_icmp.h>
984263bc 136
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137
138#include <sys/socketvar.h>
139
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140#include <net/ipfw/ip_fw.h>
141#include <net/dummynet/ip_dummynet.h>
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142
143#ifdef IPSEC
144#include <netinet6/ipsec.h>
d2438d69 145#include <netproto/key/key.h>
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146#endif
147
148#ifdef FAST_IPSEC
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149#include <netproto/ipsec/ipsec.h>
150#include <netproto/ipsec/key.h>
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151#endif
152
153int rsvp_on = 0;
154static int ip_rsvp_on;
155struct socket *ip_rsvpd;
156
dffa46cd 157int ipforwarding = 0;
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158SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW,
159 &ipforwarding, 0, "Enable IP forwarding between interfaces");
160
dffa46cd 161static int ipsendredirects = 1; /* XXX */
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162SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
163 &ipsendredirects, 0, "Enable sending IP redirects");
164
dffa46cd 165int ip_defttl = IPDEFTTL;
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166SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
167 &ip_defttl, 0, "Maximum TTL on IP packets");
168
dffa46cd 169static int ip_dosourceroute = 0;
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170SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
171 &ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
172
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173static int ip_acceptsourceroute = 0;
174SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
175 CTLFLAG_RW, &ip_acceptsourceroute, 0,
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176 "Enable accepting source routed IP packets");
177
dffa46cd 178static int ip_keepfaith = 0;
984263bc 179SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
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180 &ip_keepfaith, 0,
181 "Enable packet capture for FAITH IPv4->IPv6 translater daemon");
984263bc 182
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183static int nipq = 0; /* total # of reass queues */
184static int maxnipq;
984263bc 185SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW,
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186 &maxnipq, 0,
187 "Maximum number of IPv4 fragment reassembly queue entries");
984263bc 188
dffa46cd 189static int maxfragsperpacket;
984263bc 190SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
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191 &maxfragsperpacket, 0,
192 "Maximum number of IPv4 fragments allowed per packet");
984263bc 193
dffa46cd 194static int ip_sendsourcequench = 0;
984263bc 195SYSCTL_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
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196 &ip_sendsourcequench, 0,
197 "Enable the transmission of source quench packets");
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198
199/*
200 * XXX - Setting ip_checkinterface mostly implements the receive side of
201 * the Strong ES model described in RFC 1122, but since the routing table
202 * and transmit implementation do not implement the Strong ES model,
203 * setting this to 1 results in an odd hybrid.
204 *
205 * XXX - ip_checkinterface currently must be disabled if you use ipnat
206 * to translate the destination address to another local interface.
207 *
208 * XXX - ip_checkinterface must be disabled if you add IP aliases
209 * to the loopback interface instead of the interface where the
210 * packets for those addresses are received.
211 */
dffa46cd 212static int ip_checkinterface = 0;
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213SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
214 &ip_checkinterface, 0, "Verify packet arrives on correct interface");
215
216#ifdef DIAGNOSTIC
dffa46cd 217static int ipprintfs = 0;
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218#endif
219
8bde602d 220static struct ifqueue ipintrq;
dffa46cd 221static int ipqmaxlen = IFQ_MAXLEN;
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222
223extern struct domain inetdomain;
4468b0b4 224extern struct protosw inetsw[];
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225u_char ip_protox[IPPROTO_MAX];
226struct in_ifaddrhead in_ifaddrhead; /* first inet address */
227struct in_ifaddrhashhead *in_ifaddrhashtbl; /* inet addr hash table */
228u_long in_ifaddrhmask; /* mask for hash table */
dffa46cd 229
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230SYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RW,
231 &ipintrq.ifq_maxlen, 0, "Maximum size of the IP input queue");
232SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD,
233 &ipintrq.ifq_drops, 0, "Number of packets dropped from the IP input queue");
234
ae1d3076 235struct ip_stats ipstats_percpu[MAXCPU];
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236#ifdef SMP
237static int
238sysctl_ipstats(SYSCTL_HANDLER_ARGS)
239{
240 int cpu, error = 0;
241
242 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 243 if ((error = SYSCTL_OUT(req, &ipstats_percpu[cpu],
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244 sizeof(struct ip_stats))))
245 break;
ae1d3076 246 if ((error = SYSCTL_IN(req, &ipstats_percpu[cpu],
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247 sizeof(struct ip_stats))))
248 break;
249 }
250
251 return (error);
252}
253SYSCTL_PROC(_net_inet_ip, IPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
254 0, 0, sysctl_ipstats, "S,ip_stats", "IP statistics");
255#else
984263bc 256SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
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257 &ipstat, ip_stats, "IP statistics");
258#endif
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259
260/* Packet reassembly stuff */
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261#define IPREASS_NHASH_LOG2 6
262#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
263#define IPREASS_HMASK (IPREASS_NHASH - 1)
264#define IPREASS_HASH(x,y) \
265 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
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266
267static struct ipq ipq[IPREASS_NHASH];
268const int ipintrq_present = 1;
269
270#ifdef IPCTL_DEFMTU
271SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
272 &ip_mtu, 0, "Default MTU");
273#endif
274
275#ifdef IPSTEALTH
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276static int ipstealth = 0;
277SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW, &ipstealth, 0, "");
278#else
279static const int ipstealth = 0;
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280#endif
281
282
283/* Firewall hooks */
284ip_fw_chk_t *ip_fw_chk_ptr;
dffa46cd 285int fw_enable = 1;
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286int fw_one_pass = 1;
287
288/* Dummynet hooks */
289ip_dn_io_t *ip_dn_io_ptr;
290
e7e55f42 291struct pfil_head inet_pfil_hook;
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292
293/*
294 * XXX this is ugly -- the following two global variables are
295 * used to store packet state while it travels through the stack.
296 * Note that the code even makes assumptions on the size and
297 * alignment of fields inside struct ip_srcrt so e.g. adding some
298 * fields will break the code. This needs to be fixed.
299 *
300 * We need to save the IP options in case a protocol wants to respond
301 * to an incoming packet over the same route if the packet got here
302 * using IP source routing. This allows connection establishment and
303 * maintenance when the remote end is on a network that is not known
304 * to us.
305 */
dffa46cd
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306static int ip_nhops = 0;
307
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308static struct ip_srcrt {
309 struct in_addr dst; /* final destination */
310 char nop; /* one NOP to align */
311 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
312 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
313} ip_srcrt;
314
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315static MALLOC_DEFINE(M_IPQ, "ipq", "IP Fragment Management");
316static struct malloc_pipe ipq_mpipe;
317
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318static void save_rte (u_char *, struct in_addr);
319static int ip_dooptions (struct mbuf *m, int,
320 struct sockaddr_in *next_hop);
321static void ip_forward (struct mbuf *m, int srcrt,
322 struct sockaddr_in *next_hop);
323static void ip_freef (struct ipq *);
b76bed62 324static int ip_input_handler (struct netmsg *);
4f277347 325static struct mbuf *ip_reass (struct mbuf *, struct ipq *,
e5ecc832 326 struct ipq *, u_int32_t *);
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327
328/*
329 * IP initialization: fill in IP protocol switch table.
330 * All protocols not implemented in kernel go to raw IP protocol handler.
331 */
332void
8a3125c6 333ip_init(void)
984263bc 334{
4468b0b4 335 struct protosw *pr;
2256ba69 336 int i;
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337#ifdef SMP
338 int cpu;
339#endif
984263bc 340
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341 /*
342 * Make sure we can handle a reasonable number of fragments but
343 * cap it at 4000 (XXX).
344 */
345 mpipe_init(&ipq_mpipe, M_IPQ, sizeof(struct ipq),
346 IFQ_MAXLEN, 4000, 0, NULL);
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347 TAILQ_INIT(&in_ifaddrhead);
348 in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &in_ifaddrhmask);
4468b0b4 349 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
dffa46cd 350 if (pr == NULL)
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351 panic("ip_init");
352 for (i = 0; i < IPPROTO_MAX; i++)
353 ip_protox[i] = pr - inetsw;
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354 for (pr = inetdomain.dom_protosw;
355 pr < inetdomain.dom_protoswNPROTOSW; pr++)
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356 if (pr->pr_domain->dom_family == PF_INET &&
357 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
358 ip_protox[pr->pr_protocol] = pr - inetsw;
359
e7e55f42
JR
360 inet_pfil_hook.ph_type = PFIL_TYPE_AF;
361 inet_pfil_hook.ph_af = AF_INET;
5e3f3b7a 362 if ((i = pfil_head_register(&inet_pfil_hook)) != 0) {
e7e55f42
JR
363 printf("%s: WARNING: unable to register pfil hook, "
364 "error %d\n", __func__, i);
5e3f3b7a 365 }
e7e55f42 366
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367 for (i = 0; i < IPREASS_NHASH; i++)
368 ipq[i].next = ipq[i].prev = &ipq[i];
369
370 maxnipq = nmbclusters / 32;
371 maxfragsperpacket = 16;
372
373#ifndef RANDOM_IP_ID
374 ip_id = time_second & 0xffff;
375#endif
376 ipintrq.ifq_maxlen = ipqmaxlen;
377
fc9c7b4f 378 /*
ae1d3076 379 * Initialize IP statistics counters for each CPU.
fc9c7b4f 380 *
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381 */
382#ifdef SMP
383 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 384 bzero(&ipstats_percpu[cpu], sizeof(struct ip_stats));
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HP
385 }
386#else
387 bzero(&ipstat, sizeof(struct ip_stats));
388#endif
389
4f277347 390 netisr_register(NETISR_IP, ip_mport, ip_input_handler);
984263bc
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391}
392
393/*
394 * XXX watch out this one. It is perhaps used as a cache for
395 * the most recently used route ? it is cleared in in_addroute()
396 * when a new route is successfully created.
397 */
dffa46cd 398struct route ipforward_rt;
984263bc 399
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400/* Do transport protocol processing. */
401static void
402transport_processing_oncpu(struct mbuf *m, int hlen, struct ip *ip,
403 struct sockaddr_in *nexthop)
404{
405 /*
406 * Switch out to protocol's input routine.
407 */
408 if (nexthop && ip->ip_p == IPPROTO_TCP) {
409 /* TCP needs IPFORWARD info if available */
410 struct m_hdr tag;
411
412 tag.mh_type = MT_TAG;
413 tag.mh_flags = PACKET_TAG_IPFORWARD;
414 tag.mh_data = (caddr_t)nexthop;
415 tag.mh_next = m;
416
417 (*inetsw[ip_protox[ip->ip_p]].pr_input)
418 ((struct mbuf *)&tag, hlen, ip->ip_p);
dffa46cd 419 } else {
0c7ac0cd
JH
420 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen, ip->ip_p);
421 }
422}
423
424struct netmsg_transport_packet {
425 struct lwkt_msg nm_lmsg;
0c7ac0cd
JH
426 struct mbuf *nm_mbuf;
427 int nm_hlen;
428 boolean_t nm_hasnexthop;
429 struct sockaddr_in nm_nexthop;
430};
431
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MD
432static int
433transport_processing_handler(lwkt_msg_t lmsg)
0c7ac0cd 434{
b44419cb 435 struct netmsg_transport_packet *msg = (void *)lmsg;
0c7ac0cd
JH
436 struct sockaddr_in *nexthop;
437 struct ip *ip;
438
439 ip = mtod(msg->nm_mbuf, struct ip *);
440 nexthop = msg->nm_hasnexthop ? &msg->nm_nexthop : NULL;
441 transport_processing_oncpu(msg->nm_mbuf, msg->nm_hlen, ip, nexthop);
b44419cb
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442 lwkt_replymsg(lmsg, 0);
443 return(EASYNC);
0c7ac0cd
JH
444}
445
b76bed62 446static int
4f277347
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447ip_input_handler(struct netmsg *msg0)
448{
449 struct mbuf *m = ((struct netmsg_packet *)msg0)->nm_packet;
450
451 ip_input(m);
452 lwkt_replymsg(&msg0->nm_lmsg, 0);
b76bed62 453 return(EASYNC);
4f277347
JH
454}
455
984263bc 456/*
590b8cd4 457 * IP input routine. Checksum and byte swap header. If fragmented
984263bc
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458 * try to reassemble. Process options. Pass to next level.
459 */
460void
4f277347 461ip_input(struct mbuf *m)
984263bc
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462{
463 struct ip *ip;
464 struct ipq *fp;
465 struct in_ifaddr *ia = NULL;
466 struct ifaddr *ifa;
dffa46cd 467 int i, hlen, checkif;
984263bc
MD
468 u_short sum;
469 struct in_addr pkt_dst;
470 u_int32_t divert_info = 0; /* packet divert/tee info */
471 struct ip_fw_args args;
dffa46cd 472 boolean_t using_srcrt = FALSE; /* forward (by PFIL_HOOKS) */
0c7ac0cd 473 boolean_t needredispatch = FALSE;
e7e55f42 474 struct in_addr odst; /* original dst address(NAT) */
e5ecc832 475#if defined(FAST_IPSEC) || defined(IPDIVERT)
984263bc 476 struct m_tag *mtag;
e5ecc832
JS
477#endif
478#ifdef FAST_IPSEC
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479 struct tdb_ident *tdbi;
480 struct secpolicy *sp;
481 int s, error;
dffa46cd 482#endif
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483
484 args.eh = NULL;
485 args.oif = NULL;
486 args.rule = NULL;
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487 args.next_hop = NULL;
488
dffa46cd 489 /* Grab info from MT_TAG mbufs prepended to the chain. */
5fe66e68 490 while (m != NULL && m->m_type == MT_TAG) {
984263bc 491 switch(m->_m_tag_id) {
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MD
492 case PACKET_TAG_DUMMYNET:
493 args.rule = ((struct dn_pkt *)m)->rule;
494 break;
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MD
495 case PACKET_TAG_IPFORWARD:
496 args.next_hop = (struct sockaddr_in *)m->m_hdr.mh_data;
497 break;
5fe66e68
JH
498 default:
499 printf("ip_input: unrecognised MT_TAG tag %d\n",
500 m->_m_tag_id);
501 break;
984263bc 502 }
5fe66e68 503 m = m->m_next;
984263bc 504 }
5fe66e68 505 KASSERT(m != NULL && (m->m_flags & M_PKTHDR), ("ip_input: no HDR"));
984263bc 506
5fe66e68 507 if (args.rule != NULL) { /* dummynet already filtered us */
984263bc
MD
508 ip = mtod(m, struct ip *);
509 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
dffa46cd 510 goto iphack;
984263bc
MD
511 }
512
513 ipstat.ips_total++;
514
55d829f8
JH
515 /* length checks already done in ip_demux() */
516 KASSERT(m->m_len >= sizeof(ip), ("IP header not in one mbuf"));
984263bc 517
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MD
518 ip = mtod(m, struct ip *);
519
520 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
521 ipstat.ips_badvers++;
522 goto bad;
523 }
524
525 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
9babcab8
JH
526 /* length checks already done in ip_demux() */
527 KASSERT(hlen >= sizeof(struct ip), ("IP header len too small"));
528 KASSERT(m->m_len >= hlen, ("packet shorter than IP header length"));
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MD
529
530 /* 127/8 must not appear on wire - RFC1122 */
531 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
532 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
dffa46cd 533 if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) {
984263bc
MD
534 ipstat.ips_badaddr++;
535 goto bad;
536 }
537 }
538
539 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
540 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
541 } else {
542 if (hlen == sizeof(struct ip)) {
543 sum = in_cksum_hdr(ip);
544 } else {
545 sum = in_cksum(m, hlen);
546 }
547 }
5fe66e68 548 if (sum != 0) {
984263bc
MD
549 ipstat.ips_badsum++;
550 goto bad;
551 }
552
4d723e5a
JS
553#ifdef ALTQ
554 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
555 /* packet is dropped by traffic conditioner */
556 return;
557 }
558#endif
984263bc
MD
559 /*
560 * Convert fields to host representation.
561 */
562 ip->ip_len = ntohs(ip->ip_len);
563 if (ip->ip_len < hlen) {
564 ipstat.ips_badlen++;
565 goto bad;
566 }
567 ip->ip_off = ntohs(ip->ip_off);
568
569 /*
570 * Check that the amount of data in the buffers
571 * is as at least much as the IP header would have us expect.
572 * Trim mbufs if longer than we expect.
573 * Drop packet if shorter than we expect.
574 */
575 if (m->m_pkthdr.len < ip->ip_len) {
984263bc
MD
576 ipstat.ips_tooshort++;
577 goto bad;
578 }
579 if (m->m_pkthdr.len > ip->ip_len) {
580 if (m->m_len == m->m_pkthdr.len) {
581 m->m_len = ip->ip_len;
582 m->m_pkthdr.len = ip->ip_len;
583 } else
584 m_adj(m, ip->ip_len - m->m_pkthdr.len);
585 }
586#if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
587 /*
588 * Bypass packet filtering for packets from a tunnel (gif).
589 */
590 if (ipsec_gethist(m, NULL))
591 goto pass;
592#endif
593
594 /*
595 * IpHack's section.
596 * Right now when no processing on packet has done
597 * and it is still fresh out of network we do our black
598 * deals with it.
599 * - Firewall: deny/allow/divert
600 * - Xlate: translate packet's addr/port (NAT).
601 * - Pipe: pass pkt through dummynet.
602 * - Wrap: fake packet's addr/port <unimpl.>
603 * - Encapsulate: put it in another IP and send out. <unimp.>
dffa46cd 604 */
984263bc
MD
605
606iphack:
dffa46cd 607
984263bc 608 /*
e7e55f42
JR
609 * Run through list of hooks for input packets.
610 *
611 * NB: Beware of the destination address changing (e.g.
612 * by NAT rewriting). When this happens, tell
613 * ip_forward to do the right thing.
984263bc 614 */
afabe90c
MD
615 if (pfil_has_hooks(&inet_pfil_hook)) {
616 odst = ip->ip_dst;
f23061d4 617 if (pfil_run_hooks(&inet_pfil_hook, &m,
afabe90c
MD
618 m->m_pkthdr.rcvif, PFIL_IN)) {
619 return;
620 }
621 if (m == NULL) /* consumed by filter */
622 return;
623 ip = mtod(m, struct ip *);
624 using_srcrt = (odst.s_addr != ip->ip_dst.s_addr);
625 }
dffa46cd 626
984263bc
MD
627 if (fw_enable && IPFW_LOADED) {
628 /*
629 * If we've been forwarded from the output side, then
630 * skip the firewall a second time
631 */
5fe66e68 632 if (args.next_hop != NULL)
984263bc
MD
633 goto ours;
634
635 args.m = m;
636 i = ip_fw_chk_ptr(&args);
637 m = args.m;
638
5fe66e68
JH
639 if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */
640 if (m != NULL)
984263bc
MD
641 m_freem(m);
642 return;
643 }
5fe66e68 644 ip = mtod(m, struct ip *); /* just in case m changed */
984263bc
MD
645 if (i == 0 && args.next_hop == NULL) /* common case */
646 goto pass;
dffa46cd 647 if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG)) {
984263bc
MD
648 /* Send packet to the appropriate pipe */
649 ip_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args);
650 return;
651 }
652#ifdef IPDIVERT
dffa46cd 653 if (i != 0 && !(i & IP_FW_PORT_DYNT_FLAG)) {
984263bc
MD
654 /* Divert or tee packet */
655 divert_info = i;
656 goto ours;
657 }
658#endif
659 if (i == 0 && args.next_hop != NULL)
660 goto pass;
661 /*
662 * if we get here, the packet must be dropped
663 */
664 m_freem(m);
665 return;
666 }
667pass:
668
669 /*
670 * Process options and, if not destined for us,
671 * ship it on. ip_dooptions returns 1 when an
672 * error was detected (causing an icmp message
673 * to be sent and the original packet to be freed).
674 */
675 ip_nhops = 0; /* for source routed packets */
dffa46cd 676 if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, args.next_hop))
984263bc
MD
677 return;
678
dffa46cd
JH
679 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
680 * matter if it is destined to another node, or whether it is
681 * a multicast one, RSVP wants it! and prevents it from being forwarded
682 * anywhere else. Also checks if the rsvp daemon is running before
984263bc 683 * grabbing the packet.
dffa46cd
JH
684 */
685 if (rsvp_on && ip->ip_p == IPPROTO_RSVP)
984263bc
MD
686 goto ours;
687
688 /*
689 * Check our list of addresses, to see if the packet is for us.
690 * If we don't have any addresses, assume any unicast packet
691 * we receive might be for us (and let the upper layers deal
692 * with it).
693 */
dffa46cd 694 if (TAILQ_EMPTY(&in_ifaddrhead) && !(m->m_flags & (M_MCAST | M_BCAST)))
984263bc
MD
695 goto ours;
696
697 /*
698 * Cache the destination address of the packet; this may be
699 * changed by use of 'ipfw fwd'.
700 */
701 pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
702
703 /*
704 * Enable a consistency check between the destination address
705 * and the arrival interface for a unicast packet (the RFC 1122
706 * strong ES model) if IP forwarding is disabled and the packet
707 * is not locally generated and the packet is not subject to
708 * 'ipfw fwd'.
709 *
710 * XXX - Checking also should be disabled if the destination
711 * address is ipnat'ed to a different interface.
712 *
713 * XXX - Checking is incompatible with IP aliases added
714 * to the loopback interface instead of the interface where
715 * the packets are received.
716 */
dffa46cd
JH
717 checkif = ip_checkinterface &&
718 !ipforwarding &&
719 m->m_pkthdr.rcvif != NULL &&
720 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
721 (args.next_hop == NULL);
984263bc
MD
722
723 /*
724 * Check for exact addresses in the hash bucket.
725 */
726 LIST_FOREACH(ia, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
727 /*
728 * If the address matches, verify that the packet
729 * arrived via the correct interface if checking is
730 * enabled.
731 */
dffa46cd 732 if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
984263bc
MD
733 (!checkif || ia->ia_ifp == m->m_pkthdr.rcvif))
734 goto ours;
735 }
736 /*
737 * Check for broadcast addresses.
738 *
739 * Only accept broadcast packets that arrive via the matching
740 * interface. Reception of forwarded directed broadcasts would
741 * be handled via ip_forward() and ether_output() with the loopback
742 * into the stack for SIMPLEX interfaces handled by ether_output().
743 */
744 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
dffa46cd 745 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
83a415f4
MD
746 if (ifa->ifa_addr == NULL) /* shutdown/startup race */
747 continue;
984263bc
MD
748 if (ifa->ifa_addr->sa_family != AF_INET)
749 continue;
750 ia = ifatoia(ifa);
751 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
dffa46cd 752 pkt_dst.s_addr)
984263bc
MD
753 goto ours;
754 if (ia->ia_netbroadcast.s_addr == pkt_dst.s_addr)
755 goto ours;
756#ifdef BOOTP_COMPAT
757 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
758 goto ours;
759#endif
760 }
761 }
762 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
763 struct in_multi *inm;
5fe66e68
JH
764
765 if (ip_mrouter != NULL) {
984263bc
MD
766 /*
767 * If we are acting as a multicast router, all
768 * incoming multicast packets are passed to the
769 * kernel-level multicast forwarding function.
770 * The packet is returned (relatively) intact; if
771 * ip_mforward() returns a non-zero value, the packet
772 * must be discarded, else it may be accepted below.
773 */
5fe66e68 774 if (ip_mforward != NULL &&
dffa46cd 775 ip_mforward(ip, m->m_pkthdr.rcvif, m, NULL) != 0) {
984263bc
MD
776 ipstat.ips_cantforward++;
777 m_freem(m);
778 return;
779 }
780
781 /*
782 * The process-level routing daemon needs to receive
783 * all multicast IGMP packets, whether or not this
784 * host belongs to their destination groups.
785 */
786 if (ip->ip_p == IPPROTO_IGMP)
787 goto ours;
788 ipstat.ips_forward++;
789 }
790 /*
791 * See if we belong to the destination multicast group on the
792 * arrival interface.
793 */
794 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
795 if (inm == NULL) {
796 ipstat.ips_notmember++;
797 m_freem(m);
798 return;
799 }
800 goto ours;
801 }
dffa46cd 802 if (ip->ip_dst.s_addr == INADDR_BROADCAST)
984263bc
MD
803 goto ours;
804 if (ip->ip_dst.s_addr == INADDR_ANY)
805 goto ours;
806
807 /*
808 * FAITH(Firewall Aided Internet Translator)
809 */
810 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
811 if (ip_keepfaith) {
dffa46cd 812 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
984263bc
MD
813 goto ours;
814 }
815 m_freem(m);
816 return;
817 }
818
819 /*
820 * Not for us; forward if possible and desirable.
821 */
dffa46cd 822 if (!ipforwarding) {
984263bc
MD
823 ipstat.ips_cantforward++;
824 m_freem(m);
825 } else {
826#ifdef IPSEC
827 /*
828 * Enforce inbound IPsec SPD.
829 */
830 if (ipsec4_in_reject(m, NULL)) {
831 ipsecstat.in_polvio++;
832 goto bad;
833 }
dffa46cd 834#endif
984263bc
MD
835#ifdef FAST_IPSEC
836 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
837 s = splnet();
838 if (mtag != NULL) {
839 tdbi = (struct tdb_ident *)(mtag + 1);
840 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
841 } else {
842 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 843 IP_FORWARDING, &error);
984263bc
MD
844 }
845 if (sp == NULL) { /* NB: can happen if error */
846 splx(s);
847 /*XXX error stat???*/
848 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
849 goto bad;
850 }
851
852 /*
853 * Check security policy against packet attributes.
854 */
855 error = ipsec_in_reject(sp, m);
856 KEY_FREESP(&sp);
857 splx(s);
858 if (error) {
859 ipstat.ips_cantforward++;
860 goto bad;
861 }
dffa46cd
JH
862#endif
863 ip_forward(m, using_srcrt, args.next_hop);
984263bc
MD
864 }
865 return;
866
867ours:
dffa46cd 868
984263bc
MD
869 /*
870 * IPSTEALTH: Process non-routing options only
871 * if the packet is destined for us.
872 */
dffa46cd
JH
873 if (ipstealth &&
874 hlen > sizeof(struct ip) &&
984263bc
MD
875 ip_dooptions(m, 1, args.next_hop))
876 return;
984263bc
MD
877
878 /* Count the packet in the ip address stats */
879 if (ia != NULL) {
880 ia->ia_ifa.if_ipackets++;
881 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
882 }
883
884 /*
885 * If offset or IP_MF are set, must reassemble.
886 * Otherwise, nothing need be done.
887 * (We could look in the reassembly queue to see
888 * if the packet was previously fragmented,
889 * but it's not worth the time; just let them time out.)
890 */
891 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
892
893 /* If maxnipq is 0, never accept fragments. */
894 if (maxnipq == 0) {
dffa46cd 895 ipstat.ips_fragments++;
984263bc
MD
896 ipstat.ips_fragdropped++;
897 goto bad;
898 }
899
900 sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
901 /*
902 * Look for queue of fragments
903 * of this datagram.
904 */
905 for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next)
906 if (ip->ip_id == fp->ipq_id &&
907 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
908 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
909 ip->ip_p == fp->ipq_p)
910 goto found;
911
dffa46cd 912 fp = NULL;
984263bc
MD
913
914 /*
915 * Enforce upper bound on number of fragmented packets
916 * for which we attempt reassembly;
917 * If maxnipq is -1, accept all fragments without limitation.
918 */
919 if ((nipq > maxnipq) && (maxnipq > 0)) {
dffa46cd
JH
920 /*
921 * drop something from the tail of the current queue
922 * before proceeding further
923 */
924 if (ipq[sum].prev == &ipq[sum]) { /* gak */
925 for (i = 0; i < IPREASS_NHASH; i++) {
926 if (ipq[i].prev != &ipq[i]) {
927 ipstat.ips_fragtimeout +=
928 ipq[i].prev->ipq_nfrags;
929 ip_freef(ipq[i].prev);
930 break;
931 }
932 }
933 } else {
984263bc 934 ipstat.ips_fragtimeout +=
dffa46cd
JH
935 ipq[sum].prev->ipq_nfrags;
936 ip_freef(ipq[sum].prev);
984263bc 937 }
984263bc
MD
938 }
939found:
940 /*
941 * Adjust ip_len to not reflect header,
942 * convert offset of this to bytes.
943 */
944 ip->ip_len -= hlen;
945 if (ip->ip_off & IP_MF) {
dffa46cd
JH
946 /*
947 * Make sure that fragments have a data length
984263bc 948 * that's a non-zero multiple of 8 bytes.
dffa46cd 949 */
984263bc
MD
950 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
951 ipstat.ips_toosmall++; /* XXX */
952 goto bad;
953 }
954 m->m_flags |= M_FRAG;
955 } else
956 m->m_flags &= ~M_FRAG;
957 ip->ip_off <<= 3;
958
959 /*
960 * Attempt reassembly; if it succeeds, proceed.
961 * ip_reass() will return a different mbuf, and update
e5ecc832 962 * the divert info in divert_info.
984263bc
MD
963 */
964 ipstat.ips_fragments++;
965 m->m_pkthdr.header = ip;
e5ecc832 966 m = ip_reass(m, fp, &ipq[sum], &divert_info);
dffa46cd 967 if (m == NULL)
984263bc
MD
968 return;
969 ipstat.ips_reassembled++;
0c7ac0cd 970 needredispatch = TRUE;
984263bc
MD
971 ip = mtod(m, struct ip *);
972 /* Get the header length of the reassembled packet */
973 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
974#ifdef IPDIVERT
975 /* Restore original checksum before diverting packet */
976 if (divert_info != 0) {
977 ip->ip_len += hlen;
978 ip->ip_len = htons(ip->ip_len);
979 ip->ip_off = htons(ip->ip_off);
980 ip->ip_sum = 0;
981 if (hlen == sizeof(struct ip))
982 ip->ip_sum = in_cksum_hdr(ip);
983 else
984 ip->ip_sum = in_cksum(m, hlen);
985 ip->ip_off = ntohs(ip->ip_off);
986 ip->ip_len = ntohs(ip->ip_len);
987 ip->ip_len -= hlen;
988 }
989#endif
bf82f9b7 990 } else {
984263bc 991 ip->ip_len -= hlen;
bf82f9b7 992 }
984263bc
MD
993
994#ifdef IPDIVERT
995 /*
996 * Divert or tee packet to the divert protocol if required.
997 */
998 if (divert_info != 0) {
999 struct mbuf *clone = NULL;
1000
1001 /* Clone packet if we're doing a 'tee' */
1002 if ((divert_info & IP_FW_PORT_TEE_FLAG) != 0)
74f1caca 1003 clone = m_dup(m, MB_DONTWAIT);
984263bc
MD
1004
1005 /* Restore packet header fields to original values */
1006 ip->ip_len += hlen;
1007 ip->ip_len = htons(ip->ip_len);
1008 ip->ip_off = htons(ip->ip_off);
1009
1010 /* Deliver packet to divert input routine */
e5ecc832 1011 divert_packet(m, 1, divert_info & 0xffff);
984263bc
MD
1012 ipstat.ips_delivered++;
1013
1014 /* If 'tee', continue with original packet */
1015 if (clone == NULL)
1016 return;
1017 m = clone;
1018 ip = mtod(m, struct ip *);
1019 ip->ip_len += hlen;
1020 /*
1021 * Jump backwards to complete processing of the
1022 * packet. But first clear divert_info to avoid
1023 * entering this block again.
1024 * We do not need to clear args.divert_rule
1025 * or args.next_hop as they will not be used.
e5ecc832
JS
1026 *
1027 * XXX Better safe than sorry, remove the DIVERT tag.
984263bc 1028 */
e5ecc832
JS
1029 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1030 if (mtag != NULL)
1031 m_tag_delete(m, mtag);
1032
984263bc
MD
1033 divert_info = 0;
1034 goto pass;
1035 }
1036#endif
1037
1038#ifdef IPSEC
1039 /*
1040 * enforce IPsec policy checking if we are seeing last header.
1041 * note that we do not visit this with protocols with pcb layer
1042 * code - like udp/tcp/raw ip.
1043 */
dffa46cd 1044 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) &&
984263bc
MD
1045 ipsec4_in_reject(m, NULL)) {
1046 ipsecstat.in_polvio++;
1047 goto bad;
1048 }
1049#endif
1050#if FAST_IPSEC
1051 /*
1052 * enforce IPsec policy checking if we are seeing last header.
1053 * note that we do not visit this with protocols with pcb layer
1054 * code - like udp/tcp/raw ip.
1055 */
dffa46cd 1056 if (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) {
984263bc
MD
1057 /*
1058 * Check if the packet has already had IPsec processing
1059 * done. If so, then just pass it along. This tag gets
1060 * set during AH, ESP, etc. input handling, before the
1061 * packet is returned to the ip input queue for delivery.
dffa46cd 1062 */
984263bc
MD
1063 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1064 s = splnet();
1065 if (mtag != NULL) {
1066 tdbi = (struct tdb_ident *)(mtag + 1);
1067 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
1068 } else {
1069 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 1070 IP_FORWARDING, &error);
984263bc
MD
1071 }
1072 if (sp != NULL) {
1073 /*
1074 * Check security policy against packet attributes.
1075 */
1076 error = ipsec_in_reject(sp, m);
1077 KEY_FREESP(&sp);
1078 } else {
1079 /* XXX error stat??? */
1080 error = EINVAL;
1081DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1082 goto bad;
1083 }
1084 splx(s);
1085 if (error)
1086 goto bad;
1087 }
1088#endif /* FAST_IPSEC */
1089
984263bc 1090 ipstat.ips_delivered++;
0c7ac0cd
JH
1091 if (needredispatch) {
1092 struct netmsg_transport_packet *msg;
1093 lwkt_port_t port;
984263bc 1094
0c7ac0cd 1095 msg = malloc(sizeof(struct netmsg_transport_packet),
626bee9a 1096 M_LWKTMSG, M_INTWAIT | M_NULLOK);
b76bed62 1097 if (msg == NULL)
0c7ac0cd 1098 goto bad;
b44419cb
MD
1099
1100 lwkt_initmsg(&msg->nm_lmsg, &netisr_afree_rport, 0,
1101 lwkt_cmd_func(transport_processing_handler),
1102 lwkt_cmd_op_none);
0c7ac0cd
JH
1103 msg->nm_hlen = hlen;
1104 msg->nm_hasnexthop = (args.next_hop != NULL);
1105 if (msg->nm_hasnexthop)
1106 msg->nm_nexthop = *args.next_hop; /* structure copy */
984263bc 1107
0c7ac0cd
JH
1108 ip->ip_off = htons(ip->ip_off);
1109 ip->ip_len = htons(ip->ip_len);
b01ae44a
MD
1110 port = ip_mport(&m);
1111 if (port) {
1112 msg->nm_mbuf = m;
1113 ip = mtod(m, struct ip *);
1114 ip->ip_len = ntohs(ip->ip_len);
1115 ip->ip_off = ntohs(ip->ip_off);
1116 lwkt_sendmsg(port, &msg->nm_lmsg);
1117 }
0c7ac0cd
JH
1118 } else {
1119 transport_processing_oncpu(m, hlen, ip, args.next_hop);
bf82f9b7 1120 }
984263bc 1121 return;
a80cf23b 1122
984263bc
MD
1123bad:
1124 m_freem(m);
1125}
1126
984263bc
MD
1127/*
1128 * Take incoming datagram fragment and try to reassemble it into
1129 * whole datagram. If a chain for reassembly of this datagram already
1130 * exists, then it is given as fp; otherwise have to make a chain.
1131 *
1132 * When IPDIVERT enabled, keep additional state with each packet that
1133 * tells us if we need to divert or tee the packet we're building.
e5ecc832 1134 * In particular, *divinfo includes the port and TEE flag.
984263bc
MD
1135 */
1136
1137static struct mbuf *
1138ip_reass(struct mbuf *m, struct ipq *fp, struct ipq *where,
e5ecc832 1139 u_int32_t *divinfo)
984263bc
MD
1140{
1141 struct ip *ip = mtod(m, struct ip *);
dffa46cd 1142 struct mbuf *p = NULL, *q, *nq;
2b89bacf 1143 struct mbuf *n;
984263bc
MD
1144 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1145 int i, next;
e5ecc832
JS
1146#ifdef IPDIVERT
1147 struct m_tag *mtag;
1148#endif
984263bc
MD
1149
1150 /*
1151 * Presence of header sizes in mbufs
1152 * would confuse code below.
1153 */
1154 m->m_data += hlen;
1155 m->m_len -= hlen;
1156
1157 /*
1158 * If first fragment to arrive, create a reassembly queue.
1159 */
dffa46cd 1160 if (fp == NULL) {
2b89bacf 1161 if ((fp = mpipe_alloc_nowait(&ipq_mpipe)) == NULL)
984263bc 1162 goto dropfrag;
984263bc
MD
1163 insque(fp, where);
1164 nipq++;
1165 fp->ipq_nfrags = 1;
1166 fp->ipq_ttl = IPFRAGTTL;
1167 fp->ipq_p = ip->ip_p;
1168 fp->ipq_id = ip->ip_id;
1169 fp->ipq_src = ip->ip_src;
1170 fp->ipq_dst = ip->ip_dst;
1171 fp->ipq_frags = m;
1172 m->m_nextpkt = NULL;
1173#ifdef IPDIVERT
1174 fp->ipq_div_info = 0;
984263bc
MD
1175#endif
1176 goto inserted;
1177 } else {
1178 fp->ipq_nfrags++;
1179 }
1180
dffa46cd 1181#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
984263bc
MD
1182
1183 /*
1184 * Find a segment which begins after this one does.
1185 */
1186 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
1187 if (GETIP(q)->ip_off > ip->ip_off)
1188 break;
1189
1190 /*
1191 * If there is a preceding segment, it may provide some of
1192 * our data already. If so, drop the data from the incoming
1193 * segment. If it provides all of our data, drop us, otherwise
1194 * stick new segment in the proper place.
1195 *
1196 * If some of the data is dropped from the the preceding
1197 * segment, then it's checksum is invalidated.
1198 */
1199 if (p) {
1200 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1201 if (i > 0) {
1202 if (i >= ip->ip_len)
1203 goto dropfrag;
1204 m_adj(m, i);
1205 m->m_pkthdr.csum_flags = 0;
1206 ip->ip_off += i;
1207 ip->ip_len -= i;
1208 }
1209 m->m_nextpkt = p->m_nextpkt;
1210 p->m_nextpkt = m;
1211 } else {
1212 m->m_nextpkt = fp->ipq_frags;
1213 fp->ipq_frags = m;
1214 }
1215
1216 /*
1217 * While we overlap succeeding segments trim them or,
1218 * if they are completely covered, dequeue them.
1219 */
1220 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1221 q = nq) {
dffa46cd 1222 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
984263bc
MD
1223 if (i < GETIP(q)->ip_len) {
1224 GETIP(q)->ip_len -= i;
1225 GETIP(q)->ip_off += i;
1226 m_adj(q, i);
1227 q->m_pkthdr.csum_flags = 0;
1228 break;
1229 }
1230 nq = q->m_nextpkt;
1231 m->m_nextpkt = nq;
1232 ipstat.ips_fragdropped++;
1233 fp->ipq_nfrags--;
1234 m_freem(q);
1235 }
1236
1237inserted:
1238
1239#ifdef IPDIVERT
1240 /*
1241 * Transfer firewall instructions to the fragment structure.
1242 * Only trust info in the fragment at offset 0.
1243 */
1244 if (ip->ip_off == 0) {
1245 fp->ipq_div_info = *divinfo;
e5ecc832
JS
1246 } else {
1247 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1248 if (mtag != NULL)
1249 m_tag_delete(m, mtag);
984263bc
MD
1250 }
1251 *divinfo = 0;
984263bc
MD
1252#endif
1253
1254 /*
1255 * Check for complete reassembly and perform frag per packet
1256 * limiting.
1257 *
1258 * Frag limiting is performed here so that the nth frag has
1259 * a chance to complete the packet before we drop the packet.
1260 * As a result, n+1 frags are actually allowed per packet, but
1261 * only n will ever be stored. (n = maxfragsperpacket.)
1262 *
1263 */
1264 next = 0;
1265 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1266 if (GETIP(q)->ip_off != next) {
1267 if (fp->ipq_nfrags > maxfragsperpacket) {
1268 ipstat.ips_fragdropped += fp->ipq_nfrags;
1269 ip_freef(fp);
1270 }
dffa46cd 1271 return (NULL);
984263bc
MD
1272 }
1273 next += GETIP(q)->ip_len;
1274 }
1275 /* Make sure the last packet didn't have the IP_MF flag */
1276 if (p->m_flags & M_FRAG) {
1277 if (fp->ipq_nfrags > maxfragsperpacket) {
1278 ipstat.ips_fragdropped += fp->ipq_nfrags;
1279 ip_freef(fp);
1280 }
dffa46cd 1281 return (NULL);
984263bc
MD
1282 }
1283
1284 /*
1285 * Reassembly is complete. Make sure the packet is a sane size.
1286 */
1287 q = fp->ipq_frags;
1288 ip = GETIP(q);
1289 if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
1290 ipstat.ips_toolong++;
1291 ipstat.ips_fragdropped += fp->ipq_nfrags;
1292 ip_freef(fp);
dffa46cd 1293 return (NULL);
984263bc
MD
1294 }
1295
1296 /*
1297 * Concatenate fragments.
1298 */
1299 m = q;
2b89bacf 1300 n = m->m_next;
dffa46cd 1301 m->m_next = NULL;
2b89bacf 1302 m_cat(m, n);
984263bc 1303 nq = q->m_nextpkt;
dffa46cd 1304 q->m_nextpkt = NULL;
984263bc
MD
1305 for (q = nq; q != NULL; q = nq) {
1306 nq = q->m_nextpkt;
1307 q->m_nextpkt = NULL;
1308 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1309 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1310 m_cat(m, q);
1311 }
1312
1313#ifdef IPDIVERT
1314 /*
1315 * Extract firewall instructions from the fragment structure.
1316 */
1317 *divinfo = fp->ipq_div_info;
984263bc
MD
1318#endif
1319
1320 /*
1321 * Create header for new ip packet by
1322 * modifying header of first packet;
1323 * dequeue and discard fragment reassembly header.
1324 * Make header visible.
1325 */
1326 ip->ip_len = next;
1327 ip->ip_src = fp->ipq_src;
1328 ip->ip_dst = fp->ipq_dst;
1329 remque(fp);
1330 nipq--;
2b89bacf 1331 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1332 m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
1333 m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
1334 /* some debugging cruft by sklower, below, will go away soon */
1335 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
2256ba69 1336 int plen = 0;
dffa46cd 1337
2b89bacf
MD
1338 for (n = m; n; n = n->m_next)
1339 plen += n->m_len;
984263bc
MD
1340 m->m_pkthdr.len = plen;
1341 }
1342 return (m);
1343
1344dropfrag:
1345#ifdef IPDIVERT
1346 *divinfo = 0;
984263bc
MD
1347#endif
1348 ipstat.ips_fragdropped++;
dffa46cd 1349 if (fp != NULL)
984263bc
MD
1350 fp->ipq_nfrags--;
1351 m_freem(m);
dffa46cd 1352 return (NULL);
984263bc
MD
1353
1354#undef GETIP
1355}
1356
1357/*
1358 * Free a fragment reassembly header and all
1359 * associated datagrams.
1360 */
1361static void
dffa46cd 1362ip_freef(struct ipq *fp)
984263bc 1363{
2256ba69 1364 struct mbuf *q;
984263bc
MD
1365
1366 while (fp->ipq_frags) {
1367 q = fp->ipq_frags;
1368 fp->ipq_frags = q->m_nextpkt;
1369 m_freem(q);
1370 }
1371 remque(fp);
2b89bacf 1372 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1373 nipq--;
1374}
1375
1376/*
1377 * IP timer processing;
1378 * if a timer expires on a reassembly
1379 * queue, discard it.
1380 */
1381void
8a3125c6 1382ip_slowtimo(void)
984263bc 1383{
2256ba69 1384 struct ipq *fp;
984263bc
MD
1385 int s = splnet();
1386 int i;
1387
1388 for (i = 0; i < IPREASS_NHASH; i++) {
1389 fp = ipq[i].next;
dffa46cd 1390 if (fp == NULL)
984263bc
MD
1391 continue;
1392 while (fp != &ipq[i]) {
1393 --fp->ipq_ttl;
1394 fp = fp->next;
1395 if (fp->prev->ipq_ttl == 0) {
1396 ipstat.ips_fragtimeout += fp->prev->ipq_nfrags;
1397 ip_freef(fp->prev);
1398 }
1399 }
1400 }
1401 /*
1402 * If we are over the maximum number of fragments
1403 * (due to the limit being lowered), drain off
1404 * enough to get down to the new limit.
1405 */
1406 if (maxnipq >= 0 && nipq > maxnipq) {
1407 for (i = 0; i < IPREASS_NHASH; i++) {
1408 while (nipq > maxnipq &&
1409 (ipq[i].next != &ipq[i])) {
1410 ipstat.ips_fragdropped +=
1411 ipq[i].next->ipq_nfrags;
1412 ip_freef(ipq[i].next);
1413 }
1414 }
1415 }
1416 ipflow_slowtimo();
1417 splx(s);
1418}
1419
1420/*
1421 * Drain off all datagram fragments.
1422 */
1423void
8a3125c6 1424ip_drain(void)
984263bc 1425{
dffa46cd 1426 int i;
984263bc
MD
1427
1428 for (i = 0; i < IPREASS_NHASH; i++) {
1429 while (ipq[i].next != &ipq[i]) {
1430 ipstat.ips_fragdropped += ipq[i].next->ipq_nfrags;
1431 ip_freef(ipq[i].next);
1432 }
1433 }
1434 in_rtqdrain();
1435}
1436
1437/*
1438 * Do option processing on a datagram,
1439 * possibly discarding it if bad options are encountered,
1440 * or forwarding it if source-routed.
1441 * The pass argument is used when operating in the IPSTEALTH
1442 * mode to tell what options to process:
1443 * [LS]SRR (pass 0) or the others (pass 1).
1444 * The reason for as many as two passes is that when doing IPSTEALTH,
1445 * non-routing options should be processed only if the packet is for us.
1446 * Returns 1 if packet has been forwarded/freed,
1447 * 0 if the packet should be processed further.
1448 */
1449static int
1450ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop)
1451{
407e896e 1452 struct sockaddr_in ipaddr = { sizeof ipaddr, AF_INET };
984263bc
MD
1453 struct ip *ip = mtod(m, struct ip *);
1454 u_char *cp;
1455 struct in_ifaddr *ia;
dffa46cd
JH
1456 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB;
1457 boolean_t forward = FALSE;
984263bc
MD
1458 struct in_addr *sin, dst;
1459 n_time ntime;
1460
1461 dst = ip->ip_dst;
1462 cp = (u_char *)(ip + 1);
dffa46cd 1463 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1464 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1465 opt = cp[IPOPT_OPTVAL];
1466 if (opt == IPOPT_EOL)
1467 break;
1468 if (opt == IPOPT_NOP)
1469 optlen = 1;
1470 else {
1471 if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1472 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1473 goto bad;
1474 }
1475 optlen = cp[IPOPT_OLEN];
1476 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1477 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1478 goto bad;
1479 }
1480 }
1481 switch (opt) {
1482
1483 default:
1484 break;
1485
1486 /*
1487 * Source routing with record.
1488 * Find interface with current destination address.
1489 * If none on this machine then drop if strictly routed,
1490 * or do nothing if loosely routed.
1491 * Record interface address and bring up next address
1492 * component. If strictly routed make sure next
1493 * address is on directly accessible net.
1494 */
1495 case IPOPT_LSRR:
1496 case IPOPT_SSRR:
984263bc
MD
1497 if (ipstealth && pass > 0)
1498 break;
984263bc
MD
1499 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1500 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1501 goto bad;
1502 }
1503 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1504 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1505 goto bad;
1506 }
1507 ipaddr.sin_addr = ip->ip_dst;
1508 ia = (struct in_ifaddr *)
1509 ifa_ifwithaddr((struct sockaddr *)&ipaddr);
dffa46cd 1510 if (ia == NULL) {
984263bc
MD
1511 if (opt == IPOPT_SSRR) {
1512 type = ICMP_UNREACH;
1513 code = ICMP_UNREACH_SRCFAIL;
1514 goto bad;
1515 }
1516 if (!ip_dosourceroute)
1517 goto nosourcerouting;
1518 /*
1519 * Loose routing, and not at next destination
1520 * yet; nothing to do except forward.
1521 */
1522 break;
1523 }
1524 off--; /* 0 origin */
1525 if (off > optlen - (int)sizeof(struct in_addr)) {
1526 /*
1527 * End of source route. Should be for us.
1528 */
1529 if (!ip_acceptsourceroute)
1530 goto nosourcerouting;
1531 save_rte(cp, ip->ip_src);
1532 break;
1533 }
984263bc
MD
1534 if (ipstealth)
1535 goto dropit;
984263bc
MD
1536 if (!ip_dosourceroute) {
1537 if (ipforwarding) {
1141eb20
JH
1538 char buf[sizeof "aaa.bbb.ccc.ddd"];
1539
984263bc
MD
1540 /*
1541 * Acting as a router, so generate ICMP
1542 */
1543nosourcerouting:
1544 strcpy(buf, inet_ntoa(ip->ip_dst));
dffa46cd 1545 log(LOG_WARNING,
984263bc
MD
1546 "attempted source route from %s to %s\n",
1547 inet_ntoa(ip->ip_src), buf);
1548 type = ICMP_UNREACH;
1549 code = ICMP_UNREACH_SRCFAIL;
1550 goto bad;
1551 } else {
1552 /*
dffa46cd
JH
1553 * Not acting as a router,
1554 * so silently drop.
984263bc 1555 */
984263bc 1556dropit:
984263bc
MD
1557 ipstat.ips_cantforward++;
1558 m_freem(m);
1559 return (1);
1560 }
1561 }
1562
1563 /*
1564 * locate outgoing interface
1565 */
f23061d4
JH
1566 memcpy(&ipaddr.sin_addr, cp + off,
1567 sizeof ipaddr.sin_addr);
984263bc
MD
1568
1569 if (opt == IPOPT_SSRR) {
1570#define INA struct in_ifaddr *
1571#define SA struct sockaddr *
dffa46cd
JH
1572 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr))
1573 == NULL)
1574 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
984263bc
MD
1575 } else
1576 ia = ip_rtaddr(ipaddr.sin_addr, &ipforward_rt);
dffa46cd 1577 if (ia == NULL) {
984263bc
MD
1578 type = ICMP_UNREACH;
1579 code = ICMP_UNREACH_SRCFAIL;
1580 goto bad;
1581 }
1582 ip->ip_dst = ipaddr.sin_addr;
f23061d4 1583 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1584 sizeof(struct in_addr));
1585 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1586 /*
1587 * Let ip_intr's mcast routing check handle mcast pkts
1588 */
1589 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
1590 break;
1591
1592 case IPOPT_RR:
984263bc
MD
1593 if (ipstealth && pass == 0)
1594 break;
984263bc
MD
1595 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1596 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1597 goto bad;
1598 }
1599 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1600 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1601 goto bad;
1602 }
1603 /*
1604 * If no space remains, ignore.
1605 */
1606 off--; /* 0 origin */
1607 if (off > optlen - (int)sizeof(struct in_addr))
1608 break;
f23061d4
JH
1609 memcpy(&ipaddr.sin_addr, &ip->ip_dst,
1610 sizeof ipaddr.sin_addr);
984263bc
MD
1611 /*
1612 * locate outgoing interface; if we're the destination,
1613 * use the incoming interface (should be same).
1614 */
dffa46cd
JH
1615 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
1616 (ia = ip_rtaddr(ipaddr.sin_addr, &ipforward_rt))
1617 == NULL) {
984263bc
MD
1618 type = ICMP_UNREACH;
1619 code = ICMP_UNREACH_HOST;
1620 goto bad;
1621 }
f23061d4 1622 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1623 sizeof(struct in_addr));
1624 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1625 break;
1626
1627 case IPOPT_TS:
984263bc
MD
1628 if (ipstealth && pass == 0)
1629 break;
984263bc
MD
1630 code = cp - (u_char *)ip;
1631 if (optlen < 4 || optlen > 40) {
1632 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1633 goto bad;
1634 }
1635 if ((off = cp[IPOPT_OFFSET]) < 5) {
1636 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1637 goto bad;
1638 }
1639 if (off > optlen - (int)sizeof(int32_t)) {
1640 cp[IPOPT_OFFSET + 1] += (1 << 4);
1641 if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
1642 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1643 goto bad;
1644 }
1645 break;
1646 }
1647 off--; /* 0 origin */
1648 sin = (struct in_addr *)(cp + off);
1649 switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
1650
1651 case IPOPT_TS_TSONLY:
1652 break;
1653
1654 case IPOPT_TS_TSANDADDR:
1655 if (off + sizeof(n_time) +
1656 sizeof(struct in_addr) > optlen) {
1657 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1658 goto bad;
1659 }
1660 ipaddr.sin_addr = dst;
1661 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
1662 m->m_pkthdr.rcvif);
dffa46cd 1663 if (ia == NULL)
984263bc 1664 continue;
f23061d4 1665 memcpy(sin, &IA_SIN(ia)->sin_addr,
984263bc
MD
1666 sizeof(struct in_addr));
1667 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1668 off += sizeof(struct in_addr);
1669 break;
1670
1671 case IPOPT_TS_PRESPEC:
1672 if (off + sizeof(n_time) +
1673 sizeof(struct in_addr) > optlen) {
1674 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1675 goto bad;
1676 }
f23061d4 1677 memcpy(&ipaddr.sin_addr, sin,
984263bc 1678 sizeof(struct in_addr));
dffa46cd 1679 if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
984263bc
MD
1680 continue;
1681 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1682 off += sizeof(struct in_addr);
1683 break;
1684
1685 default:
1686 code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
1687 goto bad;
1688 }
1689 ntime = iptime();
f23061d4 1690 memcpy(cp + off, &ntime, sizeof(n_time));
984263bc
MD
1691 cp[IPOPT_OFFSET] += sizeof(n_time);
1692 }
1693 }
1694 if (forward && ipforwarding) {
1695 ip_forward(m, 1, next_hop);
1696 return (1);
1697 }
1698 return (0);
1699bad:
dffa46cd 1700 icmp_error(m, type, code, 0, NULL);
984263bc
MD
1701 ipstat.ips_badoptions++;
1702 return (1);
1703}
1704
1705/*
1706 * Given address of next destination (final or next hop),
1707 * return internet address info of interface to be used to get there.
1708 */
1709struct in_ifaddr *
dffa46cd 1710ip_rtaddr(struct in_addr dst, struct route *rt)
984263bc 1711{
2256ba69 1712 struct sockaddr_in *sin;
984263bc
MD
1713
1714 sin = (struct sockaddr_in *)&rt->ro_dst;
1715
dffa46cd 1716 if (rt->ro_rt == NULL || dst.s_addr != sin->sin_addr.s_addr) {
012d77ea 1717 if (rt->ro_rt != NULL) {
984263bc 1718 RTFREE(rt->ro_rt);
dffa46cd 1719 rt->ro_rt = NULL;
984263bc
MD
1720 }
1721 sin->sin_family = AF_INET;
5fe66e68 1722 sin->sin_len = sizeof *sin;
984263bc 1723 sin->sin_addr = dst;
984263bc
MD
1724 rtalloc_ign(rt, RTF_PRCLONING);
1725 }
dffa46cd
JH
1726
1727 if (rt->ro_rt == NULL)
1728 return (NULL);
1729
984263bc
MD
1730 return (ifatoia(rt->ro_rt->rt_ifa));
1731}
1732
1733/*
1734 * Save incoming source route for use in replies,
1735 * to be picked up later by ip_srcroute if the receiver is interested.
1736 */
1737void
dffa46cd 1738save_rte(u_char *option, struct in_addr dst)
984263bc
MD
1739{
1740 unsigned olen;
1741
1742 olen = option[IPOPT_OLEN];
1743#ifdef DIAGNOSTIC
1744 if (ipprintfs)
1745 printf("save_rte: olen %d\n", olen);
1746#endif
1747 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1748 return;
1749 bcopy(option, ip_srcrt.srcopt, olen);
1750 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1751 ip_srcrt.dst = dst;
1752}
1753
1754/*
1755 * Retrieve incoming source route for use in replies,
1756 * in the same form used by setsockopt.
1757 * The first hop is placed before the options, will be removed later.
1758 */
1759struct mbuf *
8a3125c6 1760ip_srcroute(void)
984263bc 1761{
2256ba69
RG
1762 struct in_addr *p, *q;
1763 struct mbuf *m;
984263bc
MD
1764
1765 if (ip_nhops == 0)
dffa46cd 1766 return (NULL);
74f1caca 1767 m = m_get(MB_DONTWAIT, MT_HEADER);
dffa46cd
JH
1768 if (m == NULL)
1769 return (NULL);
984263bc 1770
dffa46cd 1771#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
984263bc
MD
1772
1773 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1774 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1775 OPTSIZ;
1776#ifdef DIAGNOSTIC
1777 if (ipprintfs)
1778 printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
1779#endif
1780
1781 /*
1782 * First save first hop for return route
1783 */
1784 p = &ip_srcrt.route[ip_nhops - 1];
1785 *(mtod(m, struct in_addr *)) = *p--;
1786#ifdef DIAGNOSTIC
1787 if (ipprintfs)
3921bd79 1788 printf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
984263bc
MD
1789#endif
1790
1791 /*
1792 * Copy option fields and padding (nop) to mbuf.
1793 */
1794 ip_srcrt.nop = IPOPT_NOP;
1795 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
f23061d4 1796 memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &ip_srcrt.nop,
dffa46cd 1797 OPTSIZ);
984263bc
MD
1798 q = (struct in_addr *)(mtod(m, caddr_t) +
1799 sizeof(struct in_addr) + OPTSIZ);
1800#undef OPTSIZ
1801 /*
1802 * Record return path as an IP source route,
1803 * reversing the path (pointers are now aligned).
1804 */
1805 while (p >= ip_srcrt.route) {
1806#ifdef DIAGNOSTIC
1807 if (ipprintfs)
3921bd79 1808 printf(" %x", ntohl(q->s_addr));
984263bc
MD
1809#endif
1810 *q++ = *p--;
1811 }
1812 /*
1813 * Last hop goes to final destination.
1814 */
1815 *q = ip_srcrt.dst;
1816#ifdef DIAGNOSTIC
1817 if (ipprintfs)
3921bd79 1818 printf(" %x\n", ntohl(q->s_addr));
984263bc
MD
1819#endif
1820 return (m);
1821}
1822
1823/*
bddf0751 1824 * Strip out IP options.
984263bc
MD
1825 */
1826void
bddf0751 1827ip_stripoptions(struct mbuf *m)
984263bc 1828{
bddf0751 1829 int datalen;
984263bc 1830 struct ip *ip = mtod(m, struct ip *);
2256ba69 1831 caddr_t opts;
bddf0751 1832 int optlen;
984263bc 1833
bddf0751 1834 optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc 1835 opts = (caddr_t)(ip + 1);
bddf0751
JH
1836 datalen = m->m_len - (sizeof(struct ip) + optlen);
1837 bcopy(opts + optlen, opts, datalen);
1838 m->m_len -= optlen;
984263bc 1839 if (m->m_flags & M_PKTHDR)
bddf0751 1840 m->m_pkthdr.len -= optlen;
984263bc
MD
1841 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
1842}
1843
1844u_char inetctlerrmap[PRC_NCMDS] = {
1845 0, 0, 0, 0,
1846 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1847 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1848 EMSGSIZE, EHOSTUNREACH, 0, 0,
1849 0, 0, 0, 0,
1850 ENOPROTOOPT, ECONNREFUSED
1851};
1852
1853/*
1854 * Forward a packet. If some error occurs return the sender
1855 * an icmp packet. Note we can't always generate a meaningful
1856 * icmp message because icmp doesn't have a large enough repertoire
1857 * of codes and types.
1858 *
1859 * If not forwarding, just drop the packet. This could be confusing
1860 * if ipforwarding was zero but some routing protocol was advancing
1861 * us as a gateway to somewhere. However, we must let the routing
1862 * protocol deal with that.
1863 *
dffa46cd 1864 * The using_srcrt parameter indicates whether the packet is being forwarded
984263bc
MD
1865 * via a source route.
1866 */
1867static void
dffa46cd 1868ip_forward(struct mbuf *m, int using_srcrt, struct sockaddr_in *next_hop)
984263bc
MD
1869{
1870 struct ip *ip = mtod(m, struct ip *);
1871 struct sockaddr_in *sin;
1872 struct rtentry *rt;
1873 int error, type = 0, code = 0;
1874 struct mbuf *mcopy;
1875 n_long dest;
1876 struct in_addr pkt_dst;
1877 struct ifnet *destifp;
dffa46cd 1878 struct m_hdr tag;
984263bc
MD
1879#if defined(IPSEC) || defined(FAST_IPSEC)
1880 struct ifnet dummyifp;
1881#endif
1882
be23faf1 1883 dest = INADDR_ANY;
984263bc
MD
1884 /*
1885 * Cache the destination address of the packet; this may be
1886 * changed by use of 'ipfw fwd'.
1887 */
5fe66e68 1888 pkt_dst = (next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
1889
1890#ifdef DIAGNOSTIC
1891 if (ipprintfs)
77954deb 1892 printf("forward: src %x dst %x ttl %x\n",
dffa46cd 1893 ip->ip_src.s_addr, pkt_dst.s_addr, ip->ip_ttl);
984263bc
MD
1894#endif
1895
dffa46cd 1896 if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) {
984263bc
MD
1897 ipstat.ips_cantforward++;
1898 m_freem(m);
1899 return;
1900 }
dffa46cd
JH
1901 if (!ipstealth && ip->ip_ttl <= IPTTLDEC) {
1902 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, NULL);
1903 return;
984263bc 1904 }
984263bc
MD
1905
1906 sin = (struct sockaddr_in *)&ipforward_rt.ro_dst;
dffa46cd 1907 if ((rt = ipforward_rt.ro_rt) == NULL ||
984263bc 1908 pkt_dst.s_addr != sin->sin_addr.s_addr) {
012d77ea 1909 if (ipforward_rt.ro_rt != NULL) {
984263bc 1910 RTFREE(ipforward_rt.ro_rt);
dffa46cd 1911 ipforward_rt.ro_rt = NULL;
984263bc
MD
1912 }
1913 sin->sin_family = AF_INET;
1914 sin->sin_len = sizeof(*sin);
1915 sin->sin_addr = pkt_dst;
1916
1917 rtalloc_ign(&ipforward_rt, RTF_PRCLONING);
dffa46cd
JH
1918 if (ipforward_rt.ro_rt == NULL) {
1919 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest,
1920 NULL);
984263bc
MD
1921 return;
1922 }
1923 rt = ipforward_rt.ro_rt;
1924 }
1925
1926 /*
1927 * Save the IP header and at most 8 bytes of the payload,
1928 * in case we need to generate an ICMP message to the src.
1929 *
1930 * XXX this can be optimized a lot by saving the data in a local
1931 * buffer on the stack (72 bytes at most), and only allocating the
1932 * mbuf if really necessary. The vast majority of the packets
1933 * are forwarded without having to send an ICMP back (either
1934 * because unnecessary, or because rate limited), so we are
1935 * really we are wasting a lot of work here.
1936 *
1937 * We don't use m_copy() because it might return a reference
1938 * to a shared cluster. Both this function and ip_output()
1939 * assume exclusive access to the IP header in `m', so any
1940 * data in a cluster may change before we reach icmp_error().
1941 */
74f1caca
EN
1942 MGET(mcopy, MB_DONTWAIT, m->m_type);
1943 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, MB_DONTWAIT)) {
984263bc
MD
1944 /*
1945 * It's probably ok if the pkthdr dup fails (because
1946 * the deep copy of the tag chain failed), but for now
1947 * be conservative and just discard the copy since
1948 * code below may some day want the tags.
1949 */
1950 m_free(mcopy);
1951 mcopy = NULL;
1952 }
1953 if (mcopy != NULL) {
1954 mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
1955 (int)ip->ip_len);
52560a13 1956 mcopy->m_pkthdr.len = mcopy->m_len;
984263bc
MD
1957 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1958 }
1959
dffa46cd 1960 if (!ipstealth)
984263bc 1961 ip->ip_ttl -= IPTTLDEC;
984263bc
MD
1962
1963 /*
1964 * If forwarding packet using same interface that it came in on,
1965 * perhaps should send a redirect to sender to shortcut a hop.
1966 * Only send redirect if source is sending directly to us,
1967 * and if packet was not source routed (or has any options).
1968 * Also, don't send redirect if forwarding using a default route
1969 * or a route modified by a redirect.
1970 */
1971 if (rt->rt_ifp == m->m_pkthdr.rcvif &&
dffa46cd
JH
1972 !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) &&
1973 satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY &&
983015c8 1974 ipsendredirects && !using_srcrt && next_hop == NULL) {
984263bc
MD
1975 u_long src = ntohl(ip->ip_src.s_addr);
1976
dffa46cd
JH
1977#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa))
1978 if (RTA(rt) != NULL &&
984263bc 1979 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) {
dffa46cd
JH
1980 if (rt->rt_flags & RTF_GATEWAY)
1981 dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1982 else
1983 dest = pkt_dst.s_addr;
1984 /*
1985 * Router requirements says to only send
1986 * host redirects.
1987 */
1988 type = ICMP_REDIRECT;
1989 code = ICMP_REDIRECT_HOST;
984263bc 1990#ifdef DIAGNOSTIC
dffa46cd 1991 if (ipprintfs)
77954deb 1992 printf("redirect (%d) to %x\n", code, dest);
984263bc
MD
1993#endif
1994 }
1995 }
1996
5fe66e68 1997 if (next_hop != NULL) {
984263bc 1998 /* Pass IPFORWARD info if available */
984263bc
MD
1999 tag.mh_type = MT_TAG;
2000 tag.mh_flags = PACKET_TAG_IPFORWARD;
2001 tag.mh_data = (caddr_t)next_hop;
2002 tag.mh_next = m;
2003 m = (struct mbuf *)&tag;
2004 }
dffa46cd
JH
2005
2006 error = ip_output(m, NULL, &ipforward_rt, IP_FORWARDING, NULL, NULL);
2007
984263bc
MD
2008 if (error)
2009 ipstat.ips_cantforward++;
2010 else {
2011 ipstat.ips_forward++;
2012 if (type)
2013 ipstat.ips_redirectsent++;
2014 else {
2015 if (mcopy) {
2016 ipflow_create(&ipforward_rt, mcopy);
2017 m_freem(mcopy);
2018 }
2019 return;
2020 }
2021 }
2022 if (mcopy == NULL)
2023 return;
2024 destifp = NULL;
2025
2026 switch (error) {
2027
2028 case 0: /* forwarded, but need redirect */
2029 /* type, code set above */
2030 break;
2031
2032 case ENETUNREACH: /* shouldn't happen, checked above */
2033 case EHOSTUNREACH:
2034 case ENETDOWN:
2035 case EHOSTDOWN:
2036 default:
2037 type = ICMP_UNREACH;
2038 code = ICMP_UNREACH_HOST;
2039 break;
2040
2041 case EMSGSIZE:
2042 type = ICMP_UNREACH;
2043 code = ICMP_UNREACH_NEEDFRAG;
2044#ifdef IPSEC
2045 /*
2046 * If the packet is routed over IPsec tunnel, tell the
2047 * originator the tunnel MTU.
2048 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2049 * XXX quickhack!!!
2050 */
012d77ea 2051 if (ipforward_rt.ro_rt != NULL) {
984263bc
MD
2052 struct secpolicy *sp = NULL;
2053 int ipsecerror;
2054 int ipsechdr;
2055 struct route *ro;
2056
2057 sp = ipsec4_getpolicybyaddr(mcopy,
2058 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2059 IP_FORWARDING,
2060 &ipsecerror);
984263bc
MD
2061
2062 if (sp == NULL)
2063 destifp = ipforward_rt.ro_rt->rt_ifp;
2064 else {
2065 /* count IPsec header size */
2066 ipsechdr = ipsec4_hdrsiz(mcopy,
2067 IPSEC_DIR_OUTBOUND,
2068 NULL);
2069
2070 /*
2071 * find the correct route for outer IPv4
2072 * header, compute tunnel MTU.
2073 *
2074 * XXX BUG ALERT
2075 * The "dummyifp" code relies upon the fact
2076 * that icmp_error() touches only ifp->if_mtu.
2077 */
2078 /*XXX*/
2079 destifp = NULL;
012d77ea
JH
2080 if (sp->req != NULL && sp->req->sav != NULL &&
2081 sp->req->sav->sah != NULL) {
984263bc 2082 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2083 if (ro->ro_rt != NULL &&
2084 ro->ro_rt->rt_ifp != NULL) {
984263bc
MD
2085 dummyifp.if_mtu =
2086 ro->ro_rt->rt_ifp->if_mtu;
2087 dummyifp.if_mtu -= ipsechdr;
2088 destifp = &dummyifp;
2089 }
2090 }
2091
2092 key_freesp(sp);
2093 }
2094 }
2095#elif FAST_IPSEC
2096 /*
2097 * If the packet is routed over IPsec tunnel, tell the
2098 * originator the tunnel MTU.
2099 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2100 * XXX quickhack!!!
2101 */
012d77ea 2102 if (ipforward_rt.ro_rt != NULL) {
984263bc
MD
2103 struct secpolicy *sp = NULL;
2104 int ipsecerror;
2105 int ipsechdr;
2106 struct route *ro;
2107
2108 sp = ipsec_getpolicybyaddr(mcopy,
2109 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2110 IP_FORWARDING,
2111 &ipsecerror);
984263bc
MD
2112
2113 if (sp == NULL)
2114 destifp = ipforward_rt.ro_rt->rt_ifp;
2115 else {
2116 /* count IPsec header size */
2117 ipsechdr = ipsec4_hdrsiz(mcopy,
2118 IPSEC_DIR_OUTBOUND,
2119 NULL);
2120
2121 /*
2122 * find the correct route for outer IPv4
2123 * header, compute tunnel MTU.
2124 *
2125 * XXX BUG ALERT
2126 * The "dummyifp" code relies upon the fact
2127 * that icmp_error() touches only ifp->if_mtu.
2128 */
2129 /*XXX*/
2130 destifp = NULL;
012d77ea
JH
2131 if (sp->req != NULL &&
2132 sp->req->sav != NULL &&
2133 sp->req->sav->sah != NULL) {
984263bc 2134 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2135 if (ro->ro_rt != NULL &&
2136 ro->ro_rt->rt_ifp != NULL) {
984263bc
MD
2137 dummyifp.if_mtu =
2138 ro->ro_rt->rt_ifp->if_mtu;
2139 dummyifp.if_mtu -= ipsechdr;
2140 destifp = &dummyifp;
2141 }
2142 }
2143
2144 KEY_FREESP(&sp);
2145 }
2146 }
2147#else /* !IPSEC && !FAST_IPSEC */
012d77ea 2148 if (ipforward_rt.ro_rt != NULL)
984263bc
MD
2149 destifp = ipforward_rt.ro_rt->rt_ifp;
2150#endif /*IPSEC*/
2151 ipstat.ips_cantfrag++;
2152 break;
2153
2154 case ENOBUFS:
2155 /*
2156 * A router should not generate ICMP_SOURCEQUENCH as
2157 * required in RFC1812 Requirements for IP Version 4 Routers.
2158 * Source quench could be a big problem under DoS attacks,
2159 * or if the underlying interface is rate-limited.
2160 * Those who need source quench packets may re-enable them
2161 * via the net.inet.ip.sendsourcequench sysctl.
2162 */
dffa46cd 2163 if (!ip_sendsourcequench) {
984263bc
MD
2164 m_freem(mcopy);
2165 return;
2166 } else {
2167 type = ICMP_SOURCEQUENCH;
2168 code = 0;
2169 }
2170 break;
2171
2172 case EACCES: /* ipfw denied packet */
2173 m_freem(mcopy);
2174 return;
2175 }
2176 icmp_error(mcopy, type, code, dest, destifp);
2177}
2178
2179void
dffa46cd
JH
2180ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2181 struct mbuf *m)
984263bc
MD
2182{
2183 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2184 struct timeval tv;
2185
2186 microtime(&tv);
2187 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
dffa46cd 2188 SCM_TIMESTAMP, SOL_SOCKET);
984263bc
MD
2189 if (*mp)
2190 mp = &(*mp)->m_next;
2191 }
2192 if (inp->inp_flags & INP_RECVDSTADDR) {
2193 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2194 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2195 if (*mp)
2196 mp = &(*mp)->m_next;
2197 }
2198#ifdef notyet
2199 /* XXX
2200 * Moving these out of udp_input() made them even more broken
2201 * than they already were.
2202 */
2203 /* options were tossed already */
2204 if (inp->inp_flags & INP_RECVOPTS) {
2205 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2206 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2207 if (*mp)
2208 mp = &(*mp)->m_next;
2209 }
2210 /* ip_srcroute doesn't do what we want here, need to fix */
2211 if (inp->inp_flags & INP_RECVRETOPTS) {
2212 *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2213 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2214 if (*mp)
2215 mp = &(*mp)->m_next;
2216 }
2217#endif
2218 if (inp->inp_flags & INP_RECVIF) {
2219 struct ifnet *ifp;
2220 struct sdlbuf {
2221 struct sockaddr_dl sdl;
2222 u_char pad[32];
2223 } sdlbuf;
2224 struct sockaddr_dl *sdp;
2225 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
2226
dffa46cd
JH
2227 if (((ifp = m->m_pkthdr.rcvif)) &&
2228 ((ifp->if_index != 0) && (ifp->if_index <= if_index))) {
2229 sdp = (struct sockaddr_dl *)
2230 ifnet_addrs[ifp->if_index - 1]->ifa_addr;
984263bc
MD
2231 /*
2232 * Change our mind and don't try copy.
2233 */
dffa46cd
JH
2234 if ((sdp->sdl_family != AF_LINK) ||
2235 (sdp->sdl_len > sizeof(sdlbuf))) {
984263bc
MD
2236 goto makedummy;
2237 }
2238 bcopy(sdp, sdl2, sdp->sdl_len);
2239 } else {
dffa46cd
JH
2240makedummy:
2241 sdl2->sdl_len =
2242 offsetof(struct sockaddr_dl, sdl_data[0]);
984263bc
MD
2243 sdl2->sdl_family = AF_LINK;
2244 sdl2->sdl_index = 0;
2245 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
2246 }
2247 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
2248 IP_RECVIF, IPPROTO_IP);
2249 if (*mp)
2250 mp = &(*mp)->m_next;
2251 }
2252}
2253
2254/*
2255 * XXX these routines are called from the upper part of the kernel.
2256 *
2257 * They could also be moved to ip_mroute.c, since all the RSVP
2258 * handling is done there already.
2259 */
2260int
2261ip_rsvp_init(struct socket *so)
2262{
2263 if (so->so_type != SOCK_RAW ||
2264 so->so_proto->pr_protocol != IPPROTO_RSVP)
2265 return EOPNOTSUPP;
2266
2267 if (ip_rsvpd != NULL)
2268 return EADDRINUSE;
2269
2270 ip_rsvpd = so;
2271 /*
2272 * This may seem silly, but we need to be sure we don't over-increment
2273 * the RSVP counter, in case something slips up.
2274 */
2275 if (!ip_rsvp_on) {
2276 ip_rsvp_on = 1;
2277 rsvp_on++;
2278 }
2279
2280 return 0;
2281}
2282
2283int
2284ip_rsvp_done(void)
2285{
2286 ip_rsvpd = NULL;
2287 /*
2288 * This may seem silly, but we need to be sure we don't over-decrement
2289 * the RSVP counter, in case something slips up.
2290 */
2291 if (ip_rsvp_on) {
2292 ip_rsvp_on = 0;
2293 rsvp_on--;
2294 }
2295 return 0;
2296}
2297
2298void
a00138cb 2299rsvp_input(struct mbuf *m, ...) /* XXX must fixup manually */
984263bc 2300{
a00138cb
JS
2301 int off, proto;
2302 __va_list ap;
2303
2304 __va_start(ap, m);
2305 off = __va_arg(ap, int);
2306 proto = __va_arg(ap, int);
2307 __va_end(ap);
2308
984263bc
MD
2309 if (rsvp_input_p) { /* call the real one if loaded */
2310 rsvp_input_p(m, off, proto);
2311 return;
2312 }
2313
2314 /* Can still get packets with rsvp_on = 0 if there is a local member
2315 * of the group to which the RSVP packet is addressed. But in this
2316 * case we want to throw the packet away.
2317 */
2318
2319 if (!rsvp_on) {
2320 m_freem(m);
2321 return;
2322 }
2323
dffa46cd 2324 if (ip_rsvpd != NULL) {
984263bc
MD
2325 rip_input(m, off, proto);
2326 return;
2327 }
2328 /* Drop the packet */
2329 m_freem(m);
2330}