Move ip fragments reassemble related code from ip_input() to ip_reass()
[dragonfly.git] / sys / netinet / ip_input.c
CommitLineData
984263bc 1/*
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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 *
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5 * This code is derived from software contributed to The DragonFly Project
6 * by Jeffrey M. Hsu.
f23061d4 7 *
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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 *
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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
66d6c637 34/*
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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 $
9691feb6 68 * $DragonFly: src/sys/netinet/ip_input.c,v 1.89 2008/08/22 13:37:22 sephe Exp $
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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"
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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>
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86#include <sys/domain.h>
87#include <sys/protosw.h>
88#include <sys/socket.h>
89#include <sys/time.h>
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90#include <sys/globaldata.h>
91#include <sys/thread.h>
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92#include <sys/kernel.h>
93#include <sys/syslog.h>
94#include <sys/sysctl.h>
3f9db7f8 95#include <sys/in_cksum.h>
984263bc 96
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97#include <machine/stdarg.h>
98
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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>
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104#include <net/route.h>
105#include <net/netisr.h>
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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
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115#include <sys/thread2.h>
116#include <sys/msgport2.h>
117#include <net/netmsg2.h>
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118
119#include <sys/socketvar.h>
120
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121#include <net/ipfw/ip_fw.h>
122#include <net/dummynet/ip_dummynet.h>
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123
124#ifdef IPSEC
125#include <netinet6/ipsec.h>
d2438d69 126#include <netproto/key/key.h>
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127#endif
128
129#ifdef FAST_IPSEC
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130#include <netproto/ipsec/ipsec.h>
131#include <netproto/ipsec/key.h>
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132#endif
133
134int rsvp_on = 0;
135static int ip_rsvp_on;
136struct socket *ip_rsvpd;
137
dffa46cd 138int ipforwarding = 0;
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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 */
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143SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
144 &ipsendredirects, 0, "Enable sending IP redirects");
145
dffa46cd 146int ip_defttl = IPDEFTTL;
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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;
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151SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
152 &ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
153
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154static int ip_acceptsourceroute = 0;
155SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
156 CTLFLAG_RW, &ip_acceptsourceroute, 0,
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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
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164static int nipq = 0; /* total # of reass queues */
165static int maxnipq;
984263bc 166SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW,
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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,
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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,
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177 &ip_sendsourcequench, 0,
178 "Enable the transmission of source quench packets");
984263bc 179
b6afe32a 180int ip_do_randomid = 1;
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181SYSCTL_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
182 &ip_do_randomid, 0,
183 "Assign random ip_id values");
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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;
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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;
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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 */
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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];
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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],
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222 sizeof(struct ip_stats))))
223 break;
ae1d3076 224 if ((error = SYSCTL_IN(req, &ipstats_percpu[cpu],
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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,
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235 &ipstat, ip_stats, "IP statistics");
236#endif
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237
238/* Packet reassembly stuff */
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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)
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244
245static struct ipq ipq[IPREASS_NHASH];
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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
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253static int ipstealth = 0;
254SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW, &ipstealth, 0, "");
255#else
256static const int ipstealth = 0;
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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;
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265int fw_one_pass = 1;
266
e7e55f42 267struct pfil_head inet_pfil_hook;
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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 */
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282static int ip_nhops = 0;
283
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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
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291static MALLOC_DEFINE(M_IPQ, "ipq", "IP Fragment Management");
292static struct malloc_pipe ipq_mpipe;
293
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294static void save_rte(u_char *, struct in_addr);
295static int ip_dooptions(struct mbuf *m, int, struct sockaddr_in *);
296static void ip_freef(struct ipq *);
297static void ip_input_handler(struct netmsg *);
9691feb6 298static struct mbuf *ip_reass(struct mbuf *, u_int32_t *);
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299
300/*
301 * IP initialization: fill in IP protocol switch table.
302 * All protocols not implemented in kernel go to raw IP protocol handler.
303 */
304void
8a3125c6 305ip_init(void)
984263bc 306{
4468b0b4 307 struct protosw *pr;
2256ba69 308 int i;
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309#ifdef SMP
310 int cpu;
311#endif
984263bc 312
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313 /*
314 * Make sure we can handle a reasonable number of fragments but
315 * cap it at 4000 (XXX).
316 */
317 mpipe_init(&ipq_mpipe, M_IPQ, sizeof(struct ipq),
318 IFQ_MAXLEN, 4000, 0, NULL);
f8983475 319 for (i = 0; i < ncpus; ++i) {
1b562c24 320 TAILQ_INIT(&in_ifaddrheads[i]);
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321 in_ifaddrhashtbls[i] =
322 hashinit(INADDR_NHASH, M_IFADDR, &in_ifaddrhmask);
323 }
4468b0b4 324 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
dffa46cd 325 if (pr == NULL)
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326 panic("ip_init");
327 for (i = 0; i < IPPROTO_MAX; i++)
328 ip_protox[i] = pr - inetsw;
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329 for (pr = inetdomain.dom_protosw;
330 pr < inetdomain.dom_protoswNPROTOSW; pr++)
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331 if (pr->pr_domain->dom_family == PF_INET &&
332 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
333 ip_protox[pr->pr_protocol] = pr - inetsw;
334
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335 inet_pfil_hook.ph_type = PFIL_TYPE_AF;
336 inet_pfil_hook.ph_af = AF_INET;
5e3f3b7a 337 if ((i = pfil_head_register(&inet_pfil_hook)) != 0) {
a6ec04bc 338 kprintf("%s: WARNING: unable to register pfil hook, "
e7e55f42 339 "error %d\n", __func__, i);
5e3f3b7a 340 }
e7e55f42 341
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342 for (i = 0; i < IPREASS_NHASH; i++)
343 ipq[i].next = ipq[i].prev = &ipq[i];
344
345 maxnipq = nmbclusters / 32;
346 maxfragsperpacket = 16;
347
984263bc 348 ip_id = time_second & 0xffff;
984263bc 349
fc9c7b4f 350 /*
ae1d3076 351 * Initialize IP statistics counters for each CPU.
fc9c7b4f 352 *
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353 */
354#ifdef SMP
355 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 356 bzero(&ipstats_percpu[cpu], sizeof(struct ip_stats));
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357 }
358#else
359 bzero(&ipstat, sizeof(struct ip_stats));
360#endif
361
934c6849 362 netisr_register(NETISR_IP, ip_mport_in, ip_input_handler);
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363}
364
365/*
366 * XXX watch out this one. It is perhaps used as a cache for
367 * the most recently used route ? it is cleared in in_addroute()
368 * when a new route is successfully created.
369 */
ecdefdda 370struct route ipforward_rt[MAXCPU];
984263bc 371
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372/* Do transport protocol processing. */
373static void
5de23090 374transport_processing_oncpu(struct mbuf *m, int hlen, struct ip *ip)
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375{
376 /*
377 * Switch out to protocol's input routine.
378 */
5de23090 379 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen, ip->ip_p);
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380}
381
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382static void
383transport_processing_handler(netmsg_t netmsg)
0c7ac0cd 384{
3d6057fe 385 struct netmsg_packet *pmsg = (struct netmsg_packet *)netmsg;
0c7ac0cd 386 struct ip *ip;
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387 int hlen;
388
389 ip = mtod(pmsg->nm_packet, struct ip *);
390 hlen = pmsg->nm_netmsg.nm_lmsg.u.ms_result;
0c7ac0cd 391
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392 transport_processing_oncpu(pmsg->nm_packet, hlen, ip);
393 /* netmsg was embedded in the mbuf, do not reply! */
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394}
395
4599cf19 396static void
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397ip_input_handler(struct netmsg *msg0)
398{
399 struct mbuf *m = ((struct netmsg_packet *)msg0)->nm_packet;
400
401 ip_input(m);
6aad077d 402 /* msg0 was embedded in the mbuf, do not reply! */
4f277347
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403}
404
984263bc 405/*
590b8cd4 406 * IP input routine. Checksum and byte swap header. If fragmented
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407 * try to reassemble. Process options. Pass to next level.
408 */
409void
4f277347 410ip_input(struct mbuf *m)
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411{
412 struct ip *ip;
984263bc 413 struct in_ifaddr *ia = NULL;
f8983475 414 struct in_ifaddr_container *iac;
dffa46cd 415 int i, hlen, checkif;
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416 u_short sum;
417 struct in_addr pkt_dst;
418 u_int32_t divert_info = 0; /* packet divert/tee info */
419 struct ip_fw_args args;
dffa46cd 420 boolean_t using_srcrt = FALSE; /* forward (by PFIL_HOOKS) */
0c7ac0cd 421 boolean_t needredispatch = FALSE;
e7e55f42 422 struct in_addr odst; /* original dst address(NAT) */
984263bc 423 struct m_tag *mtag;
5de23090 424 struct sockaddr_in *next_hop = NULL;
e5ecc832 425#ifdef FAST_IPSEC
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426 struct tdb_ident *tdbi;
427 struct secpolicy *sp;
1cae611f 428 int error;
dffa46cd 429#endif
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430
431 args.eh = NULL;
432 args.oif = NULL;
433 args.rule = NULL;
984263bc 434
814907cb 435 M_ASSERTPKTHDR(m);
984263bc 436
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437 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
438 /* Next hop */
439 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
440 KKASSERT(mtag != NULL);
441 next_hop = m_tag_data(mtag);
442 }
443
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444 /* Extract info from dummynet tag */
445 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
446 if (mtag != NULL) {
84a3e25a 447 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4c7020ad 448 m_tag_delete(m, mtag);
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449 }
450
5fe66e68 451 if (args.rule != NULL) { /* dummynet already filtered us */
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452 ip = mtod(m, struct ip *);
453 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
dffa46cd 454 goto iphack;
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455 }
456
457 ipstat.ips_total++;
458
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JH
459 /* length checks already done in ip_demux() */
460 KASSERT(m->m_len >= sizeof(ip), ("IP header not in one mbuf"));
984263bc 461
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462 ip = mtod(m, struct ip *);
463
464 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
465 ipstat.ips_badvers++;
466 goto bad;
467 }
468
469 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
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470 /* length checks already done in ip_demux() */
471 KASSERT(hlen >= sizeof(struct ip), ("IP header len too small"));
472 KASSERT(m->m_len >= hlen, ("packet shorter than IP header length"));
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473
474 /* 127/8 must not appear on wire - RFC1122 */
475 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
476 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
dffa46cd 477 if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) {
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478 ipstat.ips_badaddr++;
479 goto bad;
480 }
481 }
482
483 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
484 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
485 } else {
486 if (hlen == sizeof(struct ip)) {
487 sum = in_cksum_hdr(ip);
488 } else {
489 sum = in_cksum(m, hlen);
490 }
491 }
5fe66e68 492 if (sum != 0) {
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493 ipstat.ips_badsum++;
494 goto bad;
495 }
496
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497#ifdef ALTQ
498 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
499 /* packet is dropped by traffic conditioner */
500 return;
501 }
502#endif
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503 /*
504 * Convert fields to host representation.
505 */
506 ip->ip_len = ntohs(ip->ip_len);
507 if (ip->ip_len < hlen) {
508 ipstat.ips_badlen++;
509 goto bad;
510 }
511 ip->ip_off = ntohs(ip->ip_off);
512
513 /*
514 * Check that the amount of data in the buffers
515 * is as at least much as the IP header would have us expect.
516 * Trim mbufs if longer than we expect.
517 * Drop packet if shorter than we expect.
518 */
519 if (m->m_pkthdr.len < ip->ip_len) {
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520 ipstat.ips_tooshort++;
521 goto bad;
522 }
523 if (m->m_pkthdr.len > ip->ip_len) {
524 if (m->m_len == m->m_pkthdr.len) {
525 m->m_len = ip->ip_len;
526 m->m_pkthdr.len = ip->ip_len;
527 } else
528 m_adj(m, ip->ip_len - m->m_pkthdr.len);
529 }
530#if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
531 /*
532 * Bypass packet filtering for packets from a tunnel (gif).
533 */
534 if (ipsec_gethist(m, NULL))
535 goto pass;
536#endif
537
538 /*
539 * IpHack's section.
540 * Right now when no processing on packet has done
541 * and it is still fresh out of network we do our black
542 * deals with it.
543 * - Firewall: deny/allow/divert
544 * - Xlate: translate packet's addr/port (NAT).
545 * - Pipe: pass pkt through dummynet.
546 * - Wrap: fake packet's addr/port <unimpl.>
547 * - Encapsulate: put it in another IP and send out. <unimp.>
dffa46cd 548 */
984263bc
MD
549
550iphack:
dffa46cd 551
984263bc 552 /*
e7e55f42
JR
553 * Run through list of hooks for input packets.
554 *
555 * NB: Beware of the destination address changing (e.g.
556 * by NAT rewriting). When this happens, tell
557 * ip_forward to do the right thing.
984263bc 558 */
afabe90c
MD
559 if (pfil_has_hooks(&inet_pfil_hook)) {
560 odst = ip->ip_dst;
f23061d4 561 if (pfil_run_hooks(&inet_pfil_hook, &m,
afabe90c
MD
562 m->m_pkthdr.rcvif, PFIL_IN)) {
563 return;
564 }
565 if (m == NULL) /* consumed by filter */
566 return;
567 ip = mtod(m, struct ip *);
568 using_srcrt = (odst.s_addr != ip->ip_dst.s_addr);
569 }
dffa46cd 570
984263bc
MD
571 if (fw_enable && IPFW_LOADED) {
572 /*
573 * If we've been forwarded from the output side, then
574 * skip the firewall a second time
575 */
5de23090 576 if (next_hop != NULL)
984263bc
MD
577 goto ours;
578
579 args.m = m;
580 i = ip_fw_chk_ptr(&args);
581 m = args.m;
582
5fe66e68
JH
583 if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */
584 if (m != NULL)
984263bc
MD
585 m_freem(m);
586 return;
587 }
5fe66e68 588 ip = mtod(m, struct ip *); /* just in case m changed */
5de23090
SZ
589
590 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
591 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
592 KKASSERT(mtag != NULL);
593 next_hop = m_tag_data(mtag);
594 }
595
596 if (i == 0 && next_hop == NULL) /* common case */
984263bc 597 goto pass;
84a3e25a 598 if (i & IP_FW_PORT_DYNT_FLAG) {
984263bc 599 /* Send packet to the appropriate pipe */
84a3e25a 600 ip_fw_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args);
984263bc
MD
601 return;
602 }
603#ifdef IPDIVERT
dffa46cd 604 if (i != 0 && !(i & IP_FW_PORT_DYNT_FLAG)) {
984263bc
MD
605 /* Divert or tee packet */
606 divert_info = i;
607 goto ours;
608 }
609#endif
5de23090 610 if (i == 0 && next_hop != NULL)
984263bc
MD
611 goto pass;
612 /*
613 * if we get here, the packet must be dropped
614 */
615 m_freem(m);
616 return;
617 }
618pass:
619
620 /*
621 * Process options and, if not destined for us,
622 * ship it on. ip_dooptions returns 1 when an
623 * error was detected (causing an icmp message
624 * to be sent and the original packet to be freed).
625 */
626 ip_nhops = 0; /* for source routed packets */
5de23090 627 if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, next_hop))
984263bc
MD
628 return;
629
dffa46cd
JH
630 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
631 * matter if it is destined to another node, or whether it is
632 * a multicast one, RSVP wants it! and prevents it from being forwarded
633 * anywhere else. Also checks if the rsvp daemon is running before
984263bc 634 * grabbing the packet.
dffa46cd
JH
635 */
636 if (rsvp_on && ip->ip_p == IPPROTO_RSVP)
984263bc
MD
637 goto ours;
638
639 /*
640 * Check our list of addresses, to see if the packet is for us.
641 * If we don't have any addresses, assume any unicast packet
642 * we receive might be for us (and let the upper layers deal
643 * with it).
644 */
1b562c24
SZ
645 if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid]) &&
646 !(m->m_flags & (M_MCAST | M_BCAST)))
984263bc
MD
647 goto ours;
648
649 /*
650 * Cache the destination address of the packet; this may be
651 * changed by use of 'ipfw fwd'.
652 */
5de23090 653 pkt_dst = next_hop ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
654
655 /*
656 * Enable a consistency check between the destination address
657 * and the arrival interface for a unicast packet (the RFC 1122
658 * strong ES model) if IP forwarding is disabled and the packet
659 * is not locally generated and the packet is not subject to
660 * 'ipfw fwd'.
661 *
662 * XXX - Checking also should be disabled if the destination
663 * address is ipnat'ed to a different interface.
664 *
665 * XXX - Checking is incompatible with IP aliases added
666 * to the loopback interface instead of the interface where
667 * the packets are received.
668 */
dffa46cd
JH
669 checkif = ip_checkinterface &&
670 !ipforwarding &&
671 m->m_pkthdr.rcvif != NULL &&
672 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
5de23090 673 next_hop == NULL;
984263bc
MD
674
675 /*
676 * Check for exact addresses in the hash bucket.
677 */
f8983475
SZ
678 LIST_FOREACH(iac, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
679 ia = iac->ia;
680
984263bc
MD
681 /*
682 * If the address matches, verify that the packet
683 * arrived via the correct interface if checking is
684 * enabled.
685 */
dffa46cd 686 if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
984263bc
MD
687 (!checkif || ia->ia_ifp == m->m_pkthdr.rcvif))
688 goto ours;
689 }
f8983475
SZ
690 ia = NULL;
691
984263bc
MD
692 /*
693 * Check for broadcast addresses.
694 *
695 * Only accept broadcast packets that arrive via the matching
696 * interface. Reception of forwarded directed broadcasts would
697 * be handled via ip_forward() and ether_output() with the loopback
698 * into the stack for SIMPLEX interfaces handled by ether_output().
699 */
700 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
b2632176
SZ
701 struct ifaddr_container *ifac;
702
703 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid],
704 ifa_link) {
705 struct ifaddr *ifa = ifac->ifa;
706
83a415f4
MD
707 if (ifa->ifa_addr == NULL) /* shutdown/startup race */
708 continue;
984263bc
MD
709 if (ifa->ifa_addr->sa_family != AF_INET)
710 continue;
711 ia = ifatoia(ifa);
712 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
dffa46cd 713 pkt_dst.s_addr)
984263bc
MD
714 goto ours;
715 if (ia->ia_netbroadcast.s_addr == pkt_dst.s_addr)
716 goto ours;
717#ifdef BOOTP_COMPAT
718 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
719 goto ours;
720#endif
721 }
722 }
723 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
724 struct in_multi *inm;
5fe66e68
JH
725
726 if (ip_mrouter != NULL) {
984263bc
MD
727 /*
728 * If we are acting as a multicast router, all
729 * incoming multicast packets are passed to the
730 * kernel-level multicast forwarding function.
731 * The packet is returned (relatively) intact; if
732 * ip_mforward() returns a non-zero value, the packet
733 * must be discarded, else it may be accepted below.
734 */
5fe66e68 735 if (ip_mforward != NULL &&
dffa46cd 736 ip_mforward(ip, m->m_pkthdr.rcvif, m, NULL) != 0) {
984263bc
MD
737 ipstat.ips_cantforward++;
738 m_freem(m);
739 return;
740 }
741
742 /*
743 * The process-level routing daemon needs to receive
744 * all multicast IGMP packets, whether or not this
745 * host belongs to their destination groups.
746 */
747 if (ip->ip_p == IPPROTO_IGMP)
748 goto ours;
749 ipstat.ips_forward++;
750 }
751 /*
752 * See if we belong to the destination multicast group on the
753 * arrival interface.
754 */
755 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
756 if (inm == NULL) {
757 ipstat.ips_notmember++;
758 m_freem(m);
759 return;
760 }
761 goto ours;
762 }
dffa46cd 763 if (ip->ip_dst.s_addr == INADDR_BROADCAST)
984263bc
MD
764 goto ours;
765 if (ip->ip_dst.s_addr == INADDR_ANY)
766 goto ours;
767
768 /*
769 * FAITH(Firewall Aided Internet Translator)
770 */
771 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
772 if (ip_keepfaith) {
dffa46cd 773 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
984263bc
MD
774 goto ours;
775 }
776 m_freem(m);
777 return;
778 }
779
780 /*
781 * Not for us; forward if possible and desirable.
782 */
dffa46cd 783 if (!ipforwarding) {
984263bc
MD
784 ipstat.ips_cantforward++;
785 m_freem(m);
786 } else {
787#ifdef IPSEC
788 /*
789 * Enforce inbound IPsec SPD.
790 */
791 if (ipsec4_in_reject(m, NULL)) {
792 ipsecstat.in_polvio++;
793 goto bad;
794 }
dffa46cd 795#endif
984263bc
MD
796#ifdef FAST_IPSEC
797 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 798 crit_enter();
984263bc 799 if (mtag != NULL) {
d031aa80 800 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
801 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
802 } else {
803 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 804 IP_FORWARDING, &error);
984263bc
MD
805 }
806 if (sp == NULL) { /* NB: can happen if error */
1cae611f 807 crit_exit();
984263bc
MD
808 /*XXX error stat???*/
809 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
810 goto bad;
811 }
812
813 /*
814 * Check security policy against packet attributes.
815 */
816 error = ipsec_in_reject(sp, m);
817 KEY_FREESP(&sp);
1cae611f 818 crit_exit();
984263bc
MD
819 if (error) {
820 ipstat.ips_cantforward++;
821 goto bad;
822 }
dffa46cd 823#endif
5de23090 824 ip_forward(m, using_srcrt, next_hop);
984263bc
MD
825 }
826 return;
827
828ours:
dffa46cd 829
984263bc
MD
830 /*
831 * IPSTEALTH: Process non-routing options only
832 * if the packet is destined for us.
833 */
dffa46cd
JH
834 if (ipstealth &&
835 hlen > sizeof(struct ip) &&
5de23090 836 ip_dooptions(m, 1, next_hop))
984263bc 837 return;
984263bc
MD
838
839 /* Count the packet in the ip address stats */
840 if (ia != NULL) {
841 ia->ia_ifa.if_ipackets++;
842 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
843 }
844
845 /*
846 * If offset or IP_MF are set, must reassemble.
847 * Otherwise, nothing need be done.
848 * (We could look in the reassembly queue to see
849 * if the packet was previously fragmented,
850 * but it's not worth the time; just let them time out.)
851 */
852 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
984263bc
MD
853 /*
854 * Attempt reassembly; if it succeeds, proceed.
855 * ip_reass() will return a different mbuf, and update
e5ecc832 856 * the divert info in divert_info.
984263bc 857 */
9691feb6 858 m = ip_reass(m, &divert_info);
dffa46cd 859 if (m == NULL)
984263bc 860 return;
d2f6f5b2 861
0c7ac0cd 862 needredispatch = TRUE;
984263bc
MD
863 ip = mtod(m, struct ip *);
864 /* Get the header length of the reassembled packet */
865 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
866#ifdef IPDIVERT
867 /* Restore original checksum before diverting packet */
868 if (divert_info != 0) {
869 ip->ip_len += hlen;
870 ip->ip_len = htons(ip->ip_len);
871 ip->ip_off = htons(ip->ip_off);
872 ip->ip_sum = 0;
873 if (hlen == sizeof(struct ip))
874 ip->ip_sum = in_cksum_hdr(ip);
875 else
876 ip->ip_sum = in_cksum(m, hlen);
877 ip->ip_off = ntohs(ip->ip_off);
878 ip->ip_len = ntohs(ip->ip_len);
879 ip->ip_len -= hlen;
880 }
881#endif
bf82f9b7 882 } else {
984263bc 883 ip->ip_len -= hlen;
bf82f9b7 884 }
984263bc
MD
885
886#ifdef IPDIVERT
887 /*
888 * Divert or tee packet to the divert protocol if required.
889 */
890 if (divert_info != 0) {
891 struct mbuf *clone = NULL;
892
893 /* Clone packet if we're doing a 'tee' */
894 if ((divert_info & IP_FW_PORT_TEE_FLAG) != 0)
74f1caca 895 clone = m_dup(m, MB_DONTWAIT);
984263bc
MD
896
897 /* Restore packet header fields to original values */
898 ip->ip_len += hlen;
899 ip->ip_len = htons(ip->ip_len);
900 ip->ip_off = htons(ip->ip_off);
901
902 /* Deliver packet to divert input routine */
e5ecc832 903 divert_packet(m, 1, divert_info & 0xffff);
984263bc
MD
904 ipstat.ips_delivered++;
905
906 /* If 'tee', continue with original packet */
907 if (clone == NULL)
908 return;
909 m = clone;
910 ip = mtod(m, struct ip *);
911 ip->ip_len += hlen;
912 /*
913 * Jump backwards to complete processing of the
914 * packet. But first clear divert_info to avoid
915 * entering this block again.
5de23090
SZ
916 * We do not need to clear args.divert_rule as
917 * it will not be used.
e5ecc832
JS
918 *
919 * XXX Better safe than sorry, remove the DIVERT tag.
984263bc 920 */
e5ecc832
JS
921 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
922 if (mtag != NULL)
923 m_tag_delete(m, mtag);
924
984263bc
MD
925 divert_info = 0;
926 goto pass;
927 }
928#endif
929
930#ifdef IPSEC
931 /*
932 * enforce IPsec policy checking if we are seeing last header.
933 * note that we do not visit this with protocols with pcb layer
934 * code - like udp/tcp/raw ip.
935 */
dffa46cd 936 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) &&
984263bc
MD
937 ipsec4_in_reject(m, NULL)) {
938 ipsecstat.in_polvio++;
939 goto bad;
940 }
941#endif
942#if FAST_IPSEC
943 /*
944 * enforce IPsec policy checking if we are seeing last header.
945 * note that we do not visit this with protocols with pcb layer
946 * code - like udp/tcp/raw ip.
947 */
dffa46cd 948 if (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) {
984263bc
MD
949 /*
950 * Check if the packet has already had IPsec processing
951 * done. If so, then just pass it along. This tag gets
952 * set during AH, ESP, etc. input handling, before the
953 * packet is returned to the ip input queue for delivery.
dffa46cd 954 */
984263bc 955 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 956 crit_enter();
984263bc 957 if (mtag != NULL) {
d031aa80 958 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
959 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
960 } else {
961 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 962 IP_FORWARDING, &error);
984263bc
MD
963 }
964 if (sp != NULL) {
965 /*
966 * Check security policy against packet attributes.
967 */
968 error = ipsec_in_reject(sp, m);
969 KEY_FREESP(&sp);
970 } else {
971 /* XXX error stat??? */
972 error = EINVAL;
973DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
974 goto bad;
975 }
1cae611f 976 crit_exit();
984263bc
MD
977 if (error)
978 goto bad;
979 }
980#endif /* FAST_IPSEC */
981
984263bc 982 ipstat.ips_delivered++;
0c7ac0cd 983 if (needredispatch) {
3d6057fe 984 struct netmsg_packet *pmsg;
0c7ac0cd 985 lwkt_port_t port;
984263bc 986
35658e20
JH
987 ip->ip_off = htons(ip->ip_off);
988 ip->ip_len = htons(ip->ip_len);
934c6849 989 port = ip_mport_in(&m);
35658e20
JH
990 if (port == NULL)
991 return;
992
3d6057fe
SZ
993 pmsg = &m->m_hdr.mh_netmsg;
994 netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport, 0,
4599cf19 995 transport_processing_handler);
3d6057fe
SZ
996 pmsg->nm_packet = m;
997 pmsg->nm_netmsg.nm_lmsg.u.ms_result = hlen;
984263bc 998
3f030272
JH
999 ip = mtod(m, struct ip *);
1000 ip->ip_len = ntohs(ip->ip_len);
1001 ip->ip_off = ntohs(ip->ip_off);
3d6057fe 1002 lwkt_sendmsg(port, &pmsg->nm_netmsg.nm_lmsg);
0c7ac0cd 1003 } else {
5de23090 1004 transport_processing_oncpu(m, hlen, ip);
bf82f9b7 1005 }
984263bc 1006 return;
a80cf23b 1007
984263bc
MD
1008bad:
1009 m_freem(m);
1010}
1011
984263bc
MD
1012/*
1013 * Take incoming datagram fragment and try to reassemble it into
1014 * whole datagram. If a chain for reassembly of this datagram already
1015 * exists, then it is given as fp; otherwise have to make a chain.
1016 *
1017 * When IPDIVERT enabled, keep additional state with each packet that
1018 * tells us if we need to divert or tee the packet we're building.
e5ecc832 1019 * In particular, *divinfo includes the port and TEE flag.
984263bc
MD
1020 */
1021
1022static struct mbuf *
9691feb6 1023ip_reass(struct mbuf *m, u_int32_t *divinfo)
984263bc
MD
1024{
1025 struct ip *ip = mtod(m, struct ip *);
dffa46cd 1026 struct mbuf *p = NULL, *q, *nq;
2b89bacf 1027 struct mbuf *n;
9691feb6 1028 struct ipq *fp = NULL;
984263bc
MD
1029 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
1030 int i, next;
9691feb6 1031 u_short sum;
e5ecc832
JS
1032#ifdef IPDIVERT
1033 struct m_tag *mtag;
1034#endif
984263bc 1035
9691feb6
SZ
1036 /* If maxnipq is 0, never accept fragments. */
1037 if (maxnipq == 0) {
1038 ipstat.ips_fragments++;
1039 ipstat.ips_fragdropped++;
1040 m_freem(m);
1041 return NULL;
1042 }
1043
1044 sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1045 /*
1046 * Look for queue of fragments of this datagram.
1047 */
1048 for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next)
1049 if (ip->ip_id == fp->ipq_id &&
1050 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
1051 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
1052 ip->ip_p == fp->ipq_p)
1053 goto found;
1054
1055 fp = NULL;
1056
1057 /*
1058 * Enforce upper bound on number of fragmented packets
1059 * for which we attempt reassembly;
1060 * If maxnipq is -1, accept all fragments without limitation.
1061 */
1062 if (nipq > maxnipq && maxnipq > 0) {
1063 /*
1064 * drop something from the tail of the current queue
1065 * before proceeding further
1066 */
1067 if (ipq[sum].prev == &ipq[sum]) { /* gak */
1068 for (i = 0; i < IPREASS_NHASH; i++) {
1069 if (ipq[i].prev != &ipq[i]) {
1070 ipstat.ips_fragtimeout +=
1071 ipq[i].prev->ipq_nfrags;
1072 ip_freef(ipq[i].prev);
1073 break;
1074 }
1075 }
1076 } else {
1077 ipstat.ips_fragtimeout +=
1078 ipq[sum].prev->ipq_nfrags;
1079 ip_freef(ipq[sum].prev);
1080 }
1081 }
1082found:
1083 /*
1084 * Adjust ip_len to not reflect header,
1085 * convert offset of this to bytes.
1086 */
1087 ip->ip_len -= hlen;
1088 if (ip->ip_off & IP_MF) {
1089 /*
1090 * Make sure that fragments have a data length
1091 * that's a non-zero multiple of 8 bytes.
1092 */
1093 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1094 ipstat.ips_toosmall++; /* XXX */
1095 m_freem(m);
1096 return NULL;
1097 }
1098 m->m_flags |= M_FRAG;
1099 } else
1100 m->m_flags &= ~M_FRAG;
1101 ip->ip_off <<= 3;
1102
1103 ipstat.ips_fragments++;
1104 m->m_pkthdr.header = ip;
1105
fbb35ef0
SZ
1106 /*
1107 * If the hardware has not done csum over this fragment
1108 * then csum_data is not valid at all.
1109 */
1110 if ((m->m_pkthdr.csum_flags & (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID))
1111 == (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID)) {
1112 m->m_pkthdr.csum_data = 0;
1113 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
1114 }
1115
984263bc
MD
1116 /*
1117 * Presence of header sizes in mbufs
1118 * would confuse code below.
1119 */
1120 m->m_data += hlen;
1121 m->m_len -= hlen;
1122
1123 /*
1124 * If first fragment to arrive, create a reassembly queue.
1125 */
dffa46cd 1126 if (fp == NULL) {
2b89bacf 1127 if ((fp = mpipe_alloc_nowait(&ipq_mpipe)) == NULL)
984263bc 1128 goto dropfrag;
9691feb6 1129 insque(fp, &ipq[sum]);
984263bc
MD
1130 nipq++;
1131 fp->ipq_nfrags = 1;
1132 fp->ipq_ttl = IPFRAGTTL;
1133 fp->ipq_p = ip->ip_p;
1134 fp->ipq_id = ip->ip_id;
1135 fp->ipq_src = ip->ip_src;
1136 fp->ipq_dst = ip->ip_dst;
1137 fp->ipq_frags = m;
1138 m->m_nextpkt = NULL;
1139#ifdef IPDIVERT
1140 fp->ipq_div_info = 0;
984263bc
MD
1141#endif
1142 goto inserted;
1143 } else {
1144 fp->ipq_nfrags++;
1145 }
1146
dffa46cd 1147#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
984263bc
MD
1148
1149 /*
1150 * Find a segment which begins after this one does.
1151 */
1152 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
1153 if (GETIP(q)->ip_off > ip->ip_off)
1154 break;
1155
1156 /*
1157 * If there is a preceding segment, it may provide some of
1158 * our data already. If so, drop the data from the incoming
1159 * segment. If it provides all of our data, drop us, otherwise
1160 * stick new segment in the proper place.
1161 *
1162 * If some of the data is dropped from the the preceding
1163 * segment, then it's checksum is invalidated.
1164 */
1165 if (p) {
1166 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1167 if (i > 0) {
1168 if (i >= ip->ip_len)
1169 goto dropfrag;
1170 m_adj(m, i);
1171 m->m_pkthdr.csum_flags = 0;
1172 ip->ip_off += i;
1173 ip->ip_len -= i;
1174 }
1175 m->m_nextpkt = p->m_nextpkt;
1176 p->m_nextpkt = m;
1177 } else {
1178 m->m_nextpkt = fp->ipq_frags;
1179 fp->ipq_frags = m;
1180 }
1181
1182 /*
1183 * While we overlap succeeding segments trim them or,
1184 * if they are completely covered, dequeue them.
1185 */
1186 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1187 q = nq) {
dffa46cd 1188 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
984263bc
MD
1189 if (i < GETIP(q)->ip_len) {
1190 GETIP(q)->ip_len -= i;
1191 GETIP(q)->ip_off += i;
1192 m_adj(q, i);
1193 q->m_pkthdr.csum_flags = 0;
1194 break;
1195 }
1196 nq = q->m_nextpkt;
1197 m->m_nextpkt = nq;
1198 ipstat.ips_fragdropped++;
1199 fp->ipq_nfrags--;
c4933956 1200 q->m_nextpkt = NULL;
984263bc
MD
1201 m_freem(q);
1202 }
1203
1204inserted:
1205
1206#ifdef IPDIVERT
1207 /*
1208 * Transfer firewall instructions to the fragment structure.
1209 * Only trust info in the fragment at offset 0.
1210 */
1211 if (ip->ip_off == 0) {
1212 fp->ipq_div_info = *divinfo;
e5ecc832
JS
1213 } else {
1214 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1215 if (mtag != NULL)
1216 m_tag_delete(m, mtag);
984263bc
MD
1217 }
1218 *divinfo = 0;
984263bc
MD
1219#endif
1220
1221 /*
1222 * Check for complete reassembly and perform frag per packet
1223 * limiting.
1224 *
1225 * Frag limiting is performed here so that the nth frag has
1226 * a chance to complete the packet before we drop the packet.
1227 * As a result, n+1 frags are actually allowed per packet, but
1228 * only n will ever be stored. (n = maxfragsperpacket.)
1229 *
1230 */
1231 next = 0;
1232 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1233 if (GETIP(q)->ip_off != next) {
1234 if (fp->ipq_nfrags > maxfragsperpacket) {
1235 ipstat.ips_fragdropped += fp->ipq_nfrags;
1236 ip_freef(fp);
1237 }
dffa46cd 1238 return (NULL);
984263bc
MD
1239 }
1240 next += GETIP(q)->ip_len;
1241 }
1242 /* Make sure the last packet didn't have the IP_MF flag */
1243 if (p->m_flags & M_FRAG) {
1244 if (fp->ipq_nfrags > maxfragsperpacket) {
1245 ipstat.ips_fragdropped += fp->ipq_nfrags;
1246 ip_freef(fp);
1247 }
dffa46cd 1248 return (NULL);
984263bc
MD
1249 }
1250
1251 /*
1252 * Reassembly is complete. Make sure the packet is a sane size.
1253 */
1254 q = fp->ipq_frags;
1255 ip = GETIP(q);
1256 if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
1257 ipstat.ips_toolong++;
1258 ipstat.ips_fragdropped += fp->ipq_nfrags;
1259 ip_freef(fp);
dffa46cd 1260 return (NULL);
984263bc
MD
1261 }
1262
1263 /*
1264 * Concatenate fragments.
1265 */
1266 m = q;
2b89bacf 1267 n = m->m_next;
dffa46cd 1268 m->m_next = NULL;
2b89bacf 1269 m_cat(m, n);
984263bc 1270 nq = q->m_nextpkt;
dffa46cd 1271 q->m_nextpkt = NULL;
984263bc
MD
1272 for (q = nq; q != NULL; q = nq) {
1273 nq = q->m_nextpkt;
1274 q->m_nextpkt = NULL;
1275 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1276 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1277 m_cat(m, q);
1278 }
1279
1e7aea7f
MD
1280 /*
1281 * Clean up the 1's complement checksum. Carry over 16 bits must
1282 * be added back. This assumes no more then 65535 packet fragments
37ed010a 1283 * were reassembled. A second carry can also occur (but not a third).
1e7aea7f
MD
1284 */
1285 m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) +
1286 (m->m_pkthdr.csum_data >> 16);
37ed010a
MD
1287 if (m->m_pkthdr.csum_data > 0xFFFF)
1288 m->m_pkthdr.csum_data -= 0xFFFF;
1e7aea7f
MD
1289
1290
984263bc
MD
1291#ifdef IPDIVERT
1292 /*
1293 * Extract firewall instructions from the fragment structure.
1294 */
1295 *divinfo = fp->ipq_div_info;
984263bc
MD
1296#endif
1297
1298 /*
1299 * Create header for new ip packet by
1300 * modifying header of first packet;
1301 * dequeue and discard fragment reassembly header.
1302 * Make header visible.
1303 */
1304 ip->ip_len = next;
1305 ip->ip_src = fp->ipq_src;
1306 ip->ip_dst = fp->ipq_dst;
1307 remque(fp);
1308 nipq--;
2b89bacf 1309 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1310 m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
1311 m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
1312 /* some debugging cruft by sklower, below, will go away soon */
1313 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
2256ba69 1314 int plen = 0;
dffa46cd 1315
2b89bacf
MD
1316 for (n = m; n; n = n->m_next)
1317 plen += n->m_len;
984263bc
MD
1318 m->m_pkthdr.len = plen;
1319 }
d2f6f5b2
SZ
1320
1321 ipstat.ips_reassembled++;
984263bc
MD
1322 return (m);
1323
1324dropfrag:
1325#ifdef IPDIVERT
1326 *divinfo = 0;
984263bc
MD
1327#endif
1328 ipstat.ips_fragdropped++;
dffa46cd 1329 if (fp != NULL)
984263bc
MD
1330 fp->ipq_nfrags--;
1331 m_freem(m);
dffa46cd 1332 return (NULL);
984263bc
MD
1333
1334#undef GETIP
1335}
1336
1337/*
1338 * Free a fragment reassembly header and all
1339 * associated datagrams.
1340 */
1341static void
dffa46cd 1342ip_freef(struct ipq *fp)
984263bc 1343{
2256ba69 1344 struct mbuf *q;
984263bc
MD
1345
1346 while (fp->ipq_frags) {
1347 q = fp->ipq_frags;
1348 fp->ipq_frags = q->m_nextpkt;
c4933956 1349 q->m_nextpkt = NULL;
984263bc
MD
1350 m_freem(q);
1351 }
1352 remque(fp);
2b89bacf 1353 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1354 nipq--;
1355}
1356
1357/*
1358 * IP timer processing;
1359 * if a timer expires on a reassembly
1360 * queue, discard it.
1361 */
1362void
8a3125c6 1363ip_slowtimo(void)
984263bc 1364{
2256ba69 1365 struct ipq *fp;
984263bc
MD
1366 int i;
1367
1cae611f 1368 crit_enter();
984263bc
MD
1369 for (i = 0; i < IPREASS_NHASH; i++) {
1370 fp = ipq[i].next;
dffa46cd 1371 if (fp == NULL)
984263bc
MD
1372 continue;
1373 while (fp != &ipq[i]) {
1374 --fp->ipq_ttl;
1375 fp = fp->next;
1376 if (fp->prev->ipq_ttl == 0) {
1377 ipstat.ips_fragtimeout += fp->prev->ipq_nfrags;
1378 ip_freef(fp->prev);
1379 }
1380 }
1381 }
1382 /*
1383 * If we are over the maximum number of fragments
1384 * (due to the limit being lowered), drain off
1385 * enough to get down to the new limit.
1386 */
1387 if (maxnipq >= 0 && nipq > maxnipq) {
1388 for (i = 0; i < IPREASS_NHASH; i++) {
1389 while (nipq > maxnipq &&
1390 (ipq[i].next != &ipq[i])) {
1391 ipstat.ips_fragdropped +=
1392 ipq[i].next->ipq_nfrags;
1393 ip_freef(ipq[i].next);
1394 }
1395 }
1396 }
1397 ipflow_slowtimo();
1cae611f 1398 crit_exit();
984263bc
MD
1399}
1400
1401/*
1402 * Drain off all datagram fragments.
1403 */
1404void
8a3125c6 1405ip_drain(void)
984263bc 1406{
dffa46cd 1407 int i;
984263bc
MD
1408
1409 for (i = 0; i < IPREASS_NHASH; i++) {
1410 while (ipq[i].next != &ipq[i]) {
1411 ipstat.ips_fragdropped += ipq[i].next->ipq_nfrags;
1412 ip_freef(ipq[i].next);
1413 }
1414 }
1415 in_rtqdrain();
1416}
1417
1418/*
1419 * Do option processing on a datagram,
1420 * possibly discarding it if bad options are encountered,
1421 * or forwarding it if source-routed.
1422 * The pass argument is used when operating in the IPSTEALTH
1423 * mode to tell what options to process:
1424 * [LS]SRR (pass 0) or the others (pass 1).
1425 * The reason for as many as two passes is that when doing IPSTEALTH,
1426 * non-routing options should be processed only if the packet is for us.
1427 * Returns 1 if packet has been forwarded/freed,
1428 * 0 if the packet should be processed further.
1429 */
1430static int
1431ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop)
1432{
407e896e 1433 struct sockaddr_in ipaddr = { sizeof ipaddr, AF_INET };
984263bc
MD
1434 struct ip *ip = mtod(m, struct ip *);
1435 u_char *cp;
1436 struct in_ifaddr *ia;
dffa46cd
JH
1437 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB;
1438 boolean_t forward = FALSE;
984263bc
MD
1439 struct in_addr *sin, dst;
1440 n_time ntime;
1441
1442 dst = ip->ip_dst;
1443 cp = (u_char *)(ip + 1);
dffa46cd 1444 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1445 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1446 opt = cp[IPOPT_OPTVAL];
1447 if (opt == IPOPT_EOL)
1448 break;
1449 if (opt == IPOPT_NOP)
1450 optlen = 1;
1451 else {
1452 if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1453 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1454 goto bad;
1455 }
1456 optlen = cp[IPOPT_OLEN];
1457 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1458 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1459 goto bad;
1460 }
1461 }
1462 switch (opt) {
1463
1464 default:
1465 break;
1466
1467 /*
1468 * Source routing with record.
1469 * Find interface with current destination address.
1470 * If none on this machine then drop if strictly routed,
1471 * or do nothing if loosely routed.
1472 * Record interface address and bring up next address
1473 * component. If strictly routed make sure next
1474 * address is on directly accessible net.
1475 */
1476 case IPOPT_LSRR:
1477 case IPOPT_SSRR:
984263bc
MD
1478 if (ipstealth && pass > 0)
1479 break;
984263bc
MD
1480 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1481 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1482 goto bad;
1483 }
1484 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1485 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1486 goto bad;
1487 }
1488 ipaddr.sin_addr = ip->ip_dst;
1489 ia = (struct in_ifaddr *)
1490 ifa_ifwithaddr((struct sockaddr *)&ipaddr);
dffa46cd 1491 if (ia == NULL) {
984263bc
MD
1492 if (opt == IPOPT_SSRR) {
1493 type = ICMP_UNREACH;
1494 code = ICMP_UNREACH_SRCFAIL;
1495 goto bad;
1496 }
1497 if (!ip_dosourceroute)
1498 goto nosourcerouting;
1499 /*
1500 * Loose routing, and not at next destination
1501 * yet; nothing to do except forward.
1502 */
1503 break;
1504 }
1505 off--; /* 0 origin */
1506 if (off > optlen - (int)sizeof(struct in_addr)) {
1507 /*
1508 * End of source route. Should be for us.
1509 */
1510 if (!ip_acceptsourceroute)
1511 goto nosourcerouting;
1512 save_rte(cp, ip->ip_src);
1513 break;
1514 }
984263bc
MD
1515 if (ipstealth)
1516 goto dropit;
984263bc
MD
1517 if (!ip_dosourceroute) {
1518 if (ipforwarding) {
1141eb20
JH
1519 char buf[sizeof "aaa.bbb.ccc.ddd"];
1520
984263bc
MD
1521 /*
1522 * Acting as a router, so generate ICMP
1523 */
1524nosourcerouting:
1525 strcpy(buf, inet_ntoa(ip->ip_dst));
dffa46cd 1526 log(LOG_WARNING,
984263bc
MD
1527 "attempted source route from %s to %s\n",
1528 inet_ntoa(ip->ip_src), buf);
1529 type = ICMP_UNREACH;
1530 code = ICMP_UNREACH_SRCFAIL;
1531 goto bad;
1532 } else {
1533 /*
dffa46cd
JH
1534 * Not acting as a router,
1535 * so silently drop.
984263bc 1536 */
984263bc 1537dropit:
984263bc
MD
1538 ipstat.ips_cantforward++;
1539 m_freem(m);
1540 return (1);
1541 }
1542 }
1543
1544 /*
1545 * locate outgoing interface
1546 */
f23061d4
JH
1547 memcpy(&ipaddr.sin_addr, cp + off,
1548 sizeof ipaddr.sin_addr);
984263bc
MD
1549
1550 if (opt == IPOPT_SSRR) {
1551#define INA struct in_ifaddr *
1552#define SA struct sockaddr *
dffa46cd
JH
1553 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr))
1554 == NULL)
1555 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
984263bc 1556 } else
ecdefdda
MD
1557 ia = ip_rtaddr(ipaddr.sin_addr,
1558 &ipforward_rt[mycpuid]);
dffa46cd 1559 if (ia == NULL) {
984263bc
MD
1560 type = ICMP_UNREACH;
1561 code = ICMP_UNREACH_SRCFAIL;
1562 goto bad;
1563 }
1564 ip->ip_dst = ipaddr.sin_addr;
f23061d4 1565 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1566 sizeof(struct in_addr));
1567 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1568 /*
1569 * Let ip_intr's mcast routing check handle mcast pkts
1570 */
1571 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
1572 break;
1573
1574 case IPOPT_RR:
984263bc
MD
1575 if (ipstealth && pass == 0)
1576 break;
984263bc
MD
1577 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1578 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1579 goto bad;
1580 }
1581 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1582 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1583 goto bad;
1584 }
1585 /*
1586 * If no space remains, ignore.
1587 */
1588 off--; /* 0 origin */
1589 if (off > optlen - (int)sizeof(struct in_addr))
1590 break;
f23061d4
JH
1591 memcpy(&ipaddr.sin_addr, &ip->ip_dst,
1592 sizeof ipaddr.sin_addr);
984263bc
MD
1593 /*
1594 * locate outgoing interface; if we're the destination,
1595 * use the incoming interface (should be same).
1596 */
dffa46cd 1597 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
ecdefdda
MD
1598 (ia = ip_rtaddr(ipaddr.sin_addr,
1599 &ipforward_rt[mycpuid]))
dffa46cd 1600 == NULL) {
984263bc
MD
1601 type = ICMP_UNREACH;
1602 code = ICMP_UNREACH_HOST;
1603 goto bad;
1604 }
f23061d4 1605 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1606 sizeof(struct in_addr));
1607 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1608 break;
1609
1610 case IPOPT_TS:
984263bc
MD
1611 if (ipstealth && pass == 0)
1612 break;
984263bc
MD
1613 code = cp - (u_char *)ip;
1614 if (optlen < 4 || optlen > 40) {
1615 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1616 goto bad;
1617 }
1618 if ((off = cp[IPOPT_OFFSET]) < 5) {
1619 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1620 goto bad;
1621 }
1622 if (off > optlen - (int)sizeof(int32_t)) {
1623 cp[IPOPT_OFFSET + 1] += (1 << 4);
1624 if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
1625 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1626 goto bad;
1627 }
1628 break;
1629 }
1630 off--; /* 0 origin */
1631 sin = (struct in_addr *)(cp + off);
1632 switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
1633
1634 case IPOPT_TS_TSONLY:
1635 break;
1636
1637 case IPOPT_TS_TSANDADDR:
1638 if (off + sizeof(n_time) +
1639 sizeof(struct in_addr) > optlen) {
1640 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1641 goto bad;
1642 }
1643 ipaddr.sin_addr = dst;
1644 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
1645 m->m_pkthdr.rcvif);
dffa46cd 1646 if (ia == NULL)
984263bc 1647 continue;
f23061d4 1648 memcpy(sin, &IA_SIN(ia)->sin_addr,
984263bc
MD
1649 sizeof(struct in_addr));
1650 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1651 off += sizeof(struct in_addr);
1652 break;
1653
1654 case IPOPT_TS_PRESPEC:
1655 if (off + sizeof(n_time) +
1656 sizeof(struct in_addr) > optlen) {
1657 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1658 goto bad;
1659 }
f23061d4 1660 memcpy(&ipaddr.sin_addr, sin,
984263bc 1661 sizeof(struct in_addr));
dffa46cd 1662 if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
984263bc
MD
1663 continue;
1664 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1665 off += sizeof(struct in_addr);
1666 break;
1667
1668 default:
1669 code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
1670 goto bad;
1671 }
1672 ntime = iptime();
f23061d4 1673 memcpy(cp + off, &ntime, sizeof(n_time));
984263bc
MD
1674 cp[IPOPT_OFFSET] += sizeof(n_time);
1675 }
1676 }
1677 if (forward && ipforwarding) {
41332872 1678 ip_forward(m, TRUE, next_hop);
984263bc
MD
1679 return (1);
1680 }
1681 return (0);
1682bad:
981773b8 1683 icmp_error(m, type, code, 0, 0);
984263bc
MD
1684 ipstat.ips_badoptions++;
1685 return (1);
1686}
1687
1688/*
1689 * Given address of next destination (final or next hop),
1690 * return internet address info of interface to be used to get there.
1691 */
1692struct in_ifaddr *
41332872 1693ip_rtaddr(struct in_addr dst, struct route *ro)
984263bc 1694{
2256ba69 1695 struct sockaddr_in *sin;
984263bc 1696
41332872 1697 sin = (struct sockaddr_in *)&ro->ro_dst;
984263bc 1698
41332872
JH
1699 if (ro->ro_rt == NULL || dst.s_addr != sin->sin_addr.s_addr) {
1700 if (ro->ro_rt != NULL) {
1701 RTFREE(ro->ro_rt);
1702 ro->ro_rt = NULL;
984263bc
MD
1703 }
1704 sin->sin_family = AF_INET;
5fe66e68 1705 sin->sin_len = sizeof *sin;
984263bc 1706 sin->sin_addr = dst;
41332872 1707 rtalloc_ign(ro, RTF_PRCLONING);
984263bc 1708 }
dffa46cd 1709
41332872 1710 if (ro->ro_rt == NULL)
dffa46cd
JH
1711 return (NULL);
1712
41332872 1713 return (ifatoia(ro->ro_rt->rt_ifa));
984263bc
MD
1714}
1715
1716/*
1717 * Save incoming source route for use in replies,
1718 * to be picked up later by ip_srcroute if the receiver is interested.
1719 */
1720void
dffa46cd 1721save_rte(u_char *option, struct in_addr dst)
984263bc
MD
1722{
1723 unsigned olen;
1724
1725 olen = option[IPOPT_OLEN];
1726#ifdef DIAGNOSTIC
1727 if (ipprintfs)
a6ec04bc 1728 kprintf("save_rte: olen %d\n", olen);
984263bc
MD
1729#endif
1730 if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst)))
1731 return;
1732 bcopy(option, ip_srcrt.srcopt, olen);
1733 ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1734 ip_srcrt.dst = dst;
1735}
1736
1737/*
1738 * Retrieve incoming source route for use in replies,
1739 * in the same form used by setsockopt.
1740 * The first hop is placed before the options, will be removed later.
1741 */
1742struct mbuf *
8a3125c6 1743ip_srcroute(void)
984263bc 1744{
2256ba69
RG
1745 struct in_addr *p, *q;
1746 struct mbuf *m;
984263bc
MD
1747
1748 if (ip_nhops == 0)
dffa46cd 1749 return (NULL);
74f1caca 1750 m = m_get(MB_DONTWAIT, MT_HEADER);
dffa46cd
JH
1751 if (m == NULL)
1752 return (NULL);
984263bc 1753
dffa46cd 1754#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
984263bc
MD
1755
1756 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1757 m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) +
1758 OPTSIZ;
1759#ifdef DIAGNOSTIC
1760 if (ipprintfs)
a6ec04bc 1761 kprintf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len);
984263bc
MD
1762#endif
1763
1764 /*
1765 * First save first hop for return route
1766 */
1767 p = &ip_srcrt.route[ip_nhops - 1];
1768 *(mtod(m, struct in_addr *)) = *p--;
1769#ifdef DIAGNOSTIC
1770 if (ipprintfs)
a6ec04bc 1771 kprintf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
984263bc
MD
1772#endif
1773
1774 /*
1775 * Copy option fields and padding (nop) to mbuf.
1776 */
1777 ip_srcrt.nop = IPOPT_NOP;
1778 ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
f23061d4 1779 memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &ip_srcrt.nop,
dffa46cd 1780 OPTSIZ);
984263bc
MD
1781 q = (struct in_addr *)(mtod(m, caddr_t) +
1782 sizeof(struct in_addr) + OPTSIZ);
1783#undef OPTSIZ
1784 /*
1785 * Record return path as an IP source route,
1786 * reversing the path (pointers are now aligned).
1787 */
1788 while (p >= ip_srcrt.route) {
1789#ifdef DIAGNOSTIC
1790 if (ipprintfs)
a6ec04bc 1791 kprintf(" %x", ntohl(q->s_addr));
984263bc
MD
1792#endif
1793 *q++ = *p--;
1794 }
1795 /*
1796 * Last hop goes to final destination.
1797 */
1798 *q = ip_srcrt.dst;
1799#ifdef DIAGNOSTIC
1800 if (ipprintfs)
a6ec04bc 1801 kprintf(" %x\n", ntohl(q->s_addr));
984263bc
MD
1802#endif
1803 return (m);
1804}
1805
1806/*
bddf0751 1807 * Strip out IP options.
984263bc
MD
1808 */
1809void
bddf0751 1810ip_stripoptions(struct mbuf *m)
984263bc 1811{
bddf0751 1812 int datalen;
984263bc 1813 struct ip *ip = mtod(m, struct ip *);
2256ba69 1814 caddr_t opts;
bddf0751 1815 int optlen;
984263bc 1816
bddf0751 1817 optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc 1818 opts = (caddr_t)(ip + 1);
bddf0751
JH
1819 datalen = m->m_len - (sizeof(struct ip) + optlen);
1820 bcopy(opts + optlen, opts, datalen);
1821 m->m_len -= optlen;
984263bc 1822 if (m->m_flags & M_PKTHDR)
bddf0751 1823 m->m_pkthdr.len -= optlen;
984263bc
MD
1824 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
1825}
1826
1827u_char inetctlerrmap[PRC_NCMDS] = {
1828 0, 0, 0, 0,
1829 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1830 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1831 EMSGSIZE, EHOSTUNREACH, 0, 0,
1832 0, 0, 0, 0,
1833 ENOPROTOOPT, ECONNREFUSED
1834};
1835
1836/*
1837 * Forward a packet. If some error occurs return the sender
1838 * an icmp packet. Note we can't always generate a meaningful
1839 * icmp message because icmp doesn't have a large enough repertoire
1840 * of codes and types.
1841 *
1842 * If not forwarding, just drop the packet. This could be confusing
1843 * if ipforwarding was zero but some routing protocol was advancing
1844 * us as a gateway to somewhere. However, we must let the routing
1845 * protocol deal with that.
1846 *
dffa46cd 1847 * The using_srcrt parameter indicates whether the packet is being forwarded
984263bc
MD
1848 * via a source route.
1849 */
33cc7bb1 1850void
41332872 1851ip_forward(struct mbuf *m, boolean_t using_srcrt, struct sockaddr_in *next_hop)
984263bc
MD
1852{
1853 struct ip *ip = mtod(m, struct ip *);
00392387 1854 struct sockaddr_in *ipforward_rtaddr;
984263bc 1855 struct rtentry *rt;
981773b8 1856 int error, type = 0, code = 0, destmtu = 0;
984263bc
MD
1857 struct mbuf *mcopy;
1858 n_long dest;
1859 struct in_addr pkt_dst;
ecdefdda 1860 struct route *cache_rt = &ipforward_rt[mycpuid];
984263bc 1861
be23faf1 1862 dest = INADDR_ANY;
984263bc
MD
1863 /*
1864 * Cache the destination address of the packet; this may be
1865 * changed by use of 'ipfw fwd'.
1866 */
5fe66e68 1867 pkt_dst = (next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
1868
1869#ifdef DIAGNOSTIC
1870 if (ipprintfs)
a6ec04bc 1871 kprintf("forward: src %x dst %x ttl %x\n",
dffa46cd 1872 ip->ip_src.s_addr, pkt_dst.s_addr, ip->ip_ttl);
984263bc
MD
1873#endif
1874
dffa46cd 1875 if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) {
984263bc
MD
1876 ipstat.ips_cantforward++;
1877 m_freem(m);
1878 return;
1879 }
dffa46cd 1880 if (!ipstealth && ip->ip_ttl <= IPTTLDEC) {
981773b8 1881 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
dffa46cd 1882 return;
984263bc 1883 }
984263bc 1884
ecdefdda
MD
1885 ipforward_rtaddr = (struct sockaddr_in *) &cache_rt->ro_dst;
1886 if (cache_rt->ro_rt == NULL ||
00392387 1887 ipforward_rtaddr->sin_addr.s_addr != pkt_dst.s_addr) {
ecdefdda
MD
1888 if (cache_rt->ro_rt != NULL) {
1889 RTFREE(cache_rt->ro_rt);
1890 cache_rt->ro_rt = NULL;
984263bc 1891 }
00392387
JH
1892 ipforward_rtaddr->sin_family = AF_INET;
1893 ipforward_rtaddr->sin_len = sizeof(struct sockaddr_in);
1894 ipforward_rtaddr->sin_addr = pkt_dst;
ecdefdda
MD
1895 rtalloc_ign(cache_rt, RTF_PRCLONING);
1896 if (cache_rt->ro_rt == NULL) {
981773b8 1897 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
984263bc
MD
1898 return;
1899 }
984263bc 1900 }
ecdefdda 1901 rt = cache_rt->ro_rt;
984263bc
MD
1902
1903 /*
1904 * Save the IP header and at most 8 bytes of the payload,
1905 * in case we need to generate an ICMP message to the src.
1906 *
1907 * XXX this can be optimized a lot by saving the data in a local
1908 * buffer on the stack (72 bytes at most), and only allocating the
1909 * mbuf if really necessary. The vast majority of the packets
1910 * are forwarded without having to send an ICMP back (either
1911 * because unnecessary, or because rate limited), so we are
1912 * really we are wasting a lot of work here.
1913 *
1914 * We don't use m_copy() because it might return a reference
1915 * to a shared cluster. Both this function and ip_output()
1916 * assume exclusive access to the IP header in `m', so any
1917 * data in a cluster may change before we reach icmp_error().
1918 */
85c8d4e6 1919 MGETHDR(mcopy, MB_DONTWAIT, m->m_type);
74f1caca 1920 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, MB_DONTWAIT)) {
984263bc
MD
1921 /*
1922 * It's probably ok if the pkthdr dup fails (because
1923 * the deep copy of the tag chain failed), but for now
1924 * be conservative and just discard the copy since
1925 * code below may some day want the tags.
1926 */
1927 m_free(mcopy);
1928 mcopy = NULL;
1929 }
1930 if (mcopy != NULL) {
1931 mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
1932 (int)ip->ip_len);
52560a13 1933 mcopy->m_pkthdr.len = mcopy->m_len;
984263bc
MD
1934 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1935 }
1936
dffa46cd 1937 if (!ipstealth)
984263bc 1938 ip->ip_ttl -= IPTTLDEC;
984263bc
MD
1939
1940 /*
1941 * If forwarding packet using same interface that it came in on,
1942 * perhaps should send a redirect to sender to shortcut a hop.
1943 * Only send redirect if source is sending directly to us,
1944 * and if packet was not source routed (or has any options).
1945 * Also, don't send redirect if forwarding using a default route
1946 * or a route modified by a redirect.
1947 */
1948 if (rt->rt_ifp == m->m_pkthdr.rcvif &&
dffa46cd
JH
1949 !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) &&
1950 satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY &&
983015c8 1951 ipsendredirects && !using_srcrt && next_hop == NULL) {
984263bc 1952 u_long src = ntohl(ip->ip_src.s_addr);
41332872 1953 struct in_ifaddr *rt_ifa = (struct in_ifaddr *)rt->rt_ifa;
984263bc 1954
41332872
JH
1955 if (rt_ifa != NULL &&
1956 (src & rt_ifa->ia_subnetmask) == rt_ifa->ia_subnet) {
dffa46cd
JH
1957 if (rt->rt_flags & RTF_GATEWAY)
1958 dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1959 else
1960 dest = pkt_dst.s_addr;
1961 /*
1962 * Router requirements says to only send
1963 * host redirects.
1964 */
1965 type = ICMP_REDIRECT;
1966 code = ICMP_REDIRECT_HOST;
984263bc 1967#ifdef DIAGNOSTIC
dffa46cd 1968 if (ipprintfs)
a6ec04bc 1969 kprintf("redirect (%d) to %x\n", code, dest);
984263bc
MD
1970#endif
1971 }
1972 }
1973
5de23090 1974 error = ip_output(m, NULL, cache_rt, IP_FORWARDING, NULL, NULL);
41332872 1975 if (error == 0) {
984263bc 1976 ipstat.ips_forward++;
41332872 1977 if (type == 0) {
984263bc 1978 if (mcopy) {
ecdefdda 1979 ipflow_create(cache_rt, mcopy);
297c8124 1980 m_freem(mcopy);
984263bc 1981 }
41332872
JH
1982 return; /* most common case */
1983 } else {
1984 ipstat.ips_redirectsent++;
984263bc 1985 }
41332872
JH
1986 } else {
1987 ipstat.ips_cantforward++;
984263bc 1988 }
41332872 1989
984263bc
MD
1990 if (mcopy == NULL)
1991 return;
41332872
JH
1992
1993 /*
1994 * Send ICMP message.
1995 */
984263bc
MD
1996
1997 switch (error) {
1998
1999 case 0: /* forwarded, but need redirect */
2000 /* type, code set above */
2001 break;
2002
2003 case ENETUNREACH: /* shouldn't happen, checked above */
2004 case EHOSTUNREACH:
2005 case ENETDOWN:
2006 case EHOSTDOWN:
2007 default:
2008 type = ICMP_UNREACH;
2009 code = ICMP_UNREACH_HOST;
2010 break;
2011
2012 case EMSGSIZE:
2013 type = ICMP_UNREACH;
2014 code = ICMP_UNREACH_NEEDFRAG;
2015#ifdef IPSEC
2016 /*
2017 * If the packet is routed over IPsec tunnel, tell the
2018 * originator the tunnel MTU.
2019 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2020 * XXX quickhack!!!
2021 */
ecdefdda 2022 if (cache_rt->ro_rt != NULL) {
984263bc
MD
2023 struct secpolicy *sp = NULL;
2024 int ipsecerror;
2025 int ipsechdr;
2026 struct route *ro;
2027
2028 sp = ipsec4_getpolicybyaddr(mcopy,
2029 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2030 IP_FORWARDING,
2031 &ipsecerror);
984263bc
MD
2032
2033 if (sp == NULL)
ecdefdda 2034 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2035 else {
2036 /* count IPsec header size */
2037 ipsechdr = ipsec4_hdrsiz(mcopy,
2038 IPSEC_DIR_OUTBOUND,
2039 NULL);
2040
2041 /*
2042 * find the correct route for outer IPv4
2043 * header, compute tunnel MTU.
2044 *
984263bc 2045 */
012d77ea
JH
2046 if (sp->req != NULL && sp->req->sav != NULL &&
2047 sp->req->sav->sah != NULL) {
984263bc 2048 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2049 if (ro->ro_rt != NULL &&
2050 ro->ro_rt->rt_ifp != NULL) {
981773b8 2051 destmtu =
984263bc 2052 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2053 destmtu -= ipsechdr;
984263bc
MD
2054 }
2055 }
2056
2057 key_freesp(sp);
2058 }
2059 }
2060#elif FAST_IPSEC
2061 /*
2062 * If the packet is routed over IPsec tunnel, tell the
2063 * originator the tunnel MTU.
2064 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2065 * XXX quickhack!!!
2066 */
ecdefdda 2067 if (cache_rt->ro_rt != NULL) {
984263bc
MD
2068 struct secpolicy *sp = NULL;
2069 int ipsecerror;
2070 int ipsechdr;
2071 struct route *ro;
2072
2073 sp = ipsec_getpolicybyaddr(mcopy,
2074 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2075 IP_FORWARDING,
2076 &ipsecerror);
984263bc
MD
2077
2078 if (sp == NULL)
ecdefdda 2079 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2080 else {
2081 /* count IPsec header size */
2082 ipsechdr = ipsec4_hdrsiz(mcopy,
2083 IPSEC_DIR_OUTBOUND,
2084 NULL);
2085
2086 /*
2087 * find the correct route for outer IPv4
2088 * header, compute tunnel MTU.
984263bc 2089 */
981773b8 2090
012d77ea
JH
2091 if (sp->req != NULL &&
2092 sp->req->sav != NULL &&
2093 sp->req->sav->sah != NULL) {
984263bc 2094 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2095 if (ro->ro_rt != NULL &&
2096 ro->ro_rt->rt_ifp != NULL) {
981773b8 2097 destmtu =
984263bc 2098 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2099 destmtu -= ipsechdr;
984263bc
MD
2100 }
2101 }
2102
2103 KEY_FREESP(&sp);
2104 }
2105 }
2106#else /* !IPSEC && !FAST_IPSEC */
ecdefdda
MD
2107 if (cache_rt->ro_rt != NULL)
2108 destmtu = cache_rt->ro_rt->rt_ifp->if_mtu;
984263bc
MD
2109#endif /*IPSEC*/
2110 ipstat.ips_cantfrag++;
2111 break;
2112
2113 case ENOBUFS:
2114 /*
2115 * A router should not generate ICMP_SOURCEQUENCH as
2116 * required in RFC1812 Requirements for IP Version 4 Routers.
2117 * Source quench could be a big problem under DoS attacks,
2118 * or if the underlying interface is rate-limited.
2119 * Those who need source quench packets may re-enable them
2120 * via the net.inet.ip.sendsourcequench sysctl.
2121 */
dffa46cd 2122 if (!ip_sendsourcequench) {
984263bc
MD
2123 m_freem(mcopy);
2124 return;
2125 } else {
2126 type = ICMP_SOURCEQUENCH;
2127 code = 0;
2128 }
2129 break;
2130
2131 case EACCES: /* ipfw denied packet */
2132 m_freem(mcopy);
2133 return;
2134 }
981773b8 2135 icmp_error(mcopy, type, code, dest, destmtu);
984263bc
MD
2136}
2137
2138void
dffa46cd
JH
2139ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2140 struct mbuf *m)
984263bc
MD
2141{
2142 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2143 struct timeval tv;
2144
2145 microtime(&tv);
2146 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
dffa46cd 2147 SCM_TIMESTAMP, SOL_SOCKET);
984263bc
MD
2148 if (*mp)
2149 mp = &(*mp)->m_next;
2150 }
2151 if (inp->inp_flags & INP_RECVDSTADDR) {
2152 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2153 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2154 if (*mp)
2155 mp = &(*mp)->m_next;
2156 }
95926362
MD
2157 if (inp->inp_flags & INP_RECVTTL) {
2158 *mp = sbcreatecontrol((caddr_t) &ip->ip_ttl,
2159 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
2160 if (*mp)
2161 mp = &(*mp)->m_next;
2162 }
984263bc
MD
2163#ifdef notyet
2164 /* XXX
2165 * Moving these out of udp_input() made them even more broken
2166 * than they already were.
2167 */
2168 /* options were tossed already */
2169 if (inp->inp_flags & INP_RECVOPTS) {
2170 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2171 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2172 if (*mp)
2173 mp = &(*mp)->m_next;
2174 }
2175 /* ip_srcroute doesn't do what we want here, need to fix */
2176 if (inp->inp_flags & INP_RECVRETOPTS) {
2177 *mp = sbcreatecontrol((caddr_t) ip_srcroute(),
2178 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2179 if (*mp)
2180 mp = &(*mp)->m_next;
2181 }
2182#endif
2183 if (inp->inp_flags & INP_RECVIF) {
2184 struct ifnet *ifp;
2185 struct sdlbuf {
2186 struct sockaddr_dl sdl;
2187 u_char pad[32];
2188 } sdlbuf;
2189 struct sockaddr_dl *sdp;
2190 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
2191
dffa46cd
JH
2192 if (((ifp = m->m_pkthdr.rcvif)) &&
2193 ((ifp->if_index != 0) && (ifp->if_index <= if_index))) {
f2682cb9 2194 sdp = IF_LLSOCKADDR(ifp);
984263bc
MD
2195 /*
2196 * Change our mind and don't try copy.
2197 */
dffa46cd
JH
2198 if ((sdp->sdl_family != AF_LINK) ||
2199 (sdp->sdl_len > sizeof(sdlbuf))) {
984263bc
MD
2200 goto makedummy;
2201 }
2202 bcopy(sdp, sdl2, sdp->sdl_len);
2203 } else {
dffa46cd
JH
2204makedummy:
2205 sdl2->sdl_len =
2206 offsetof(struct sockaddr_dl, sdl_data[0]);
984263bc
MD
2207 sdl2->sdl_family = AF_LINK;
2208 sdl2->sdl_index = 0;
2209 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
2210 }
2211 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
2212 IP_RECVIF, IPPROTO_IP);
2213 if (*mp)
2214 mp = &(*mp)->m_next;
2215 }
2216}
2217
2218/*
2219 * XXX these routines are called from the upper part of the kernel.
2220 *
2221 * They could also be moved to ip_mroute.c, since all the RSVP
2222 * handling is done there already.
2223 */
2224int
2225ip_rsvp_init(struct socket *so)
2226{
2227 if (so->so_type != SOCK_RAW ||
2228 so->so_proto->pr_protocol != IPPROTO_RSVP)
2229 return EOPNOTSUPP;
2230
2231 if (ip_rsvpd != NULL)
2232 return EADDRINUSE;
2233
2234 ip_rsvpd = so;
2235 /*
2236 * This may seem silly, but we need to be sure we don't over-increment
2237 * the RSVP counter, in case something slips up.
2238 */
2239 if (!ip_rsvp_on) {
2240 ip_rsvp_on = 1;
2241 rsvp_on++;
2242 }
2243
2244 return 0;
2245}
2246
2247int
2248ip_rsvp_done(void)
2249{
2250 ip_rsvpd = NULL;
2251 /*
2252 * This may seem silly, but we need to be sure we don't over-decrement
2253 * the RSVP counter, in case something slips up.
2254 */
2255 if (ip_rsvp_on) {
2256 ip_rsvp_on = 0;
2257 rsvp_on--;
2258 }
2259 return 0;
2260}
2261
2262void
a00138cb 2263rsvp_input(struct mbuf *m, ...) /* XXX must fixup manually */
984263bc 2264{
a00138cb
JS
2265 int off, proto;
2266 __va_list ap;
2267
2268 __va_start(ap, m);
2269 off = __va_arg(ap, int);
2270 proto = __va_arg(ap, int);
2271 __va_end(ap);
2272
984263bc
MD
2273 if (rsvp_input_p) { /* call the real one if loaded */
2274 rsvp_input_p(m, off, proto);
2275 return;
2276 }
2277
2278 /* Can still get packets with rsvp_on = 0 if there is a local member
2279 * of the group to which the RSVP packet is addressed. But in this
2280 * case we want to throw the packet away.
2281 */
2282
2283 if (!rsvp_on) {
2284 m_freem(m);
2285 return;
2286 }
2287
dffa46cd 2288 if (ip_rsvpd != NULL) {
984263bc
MD
2289 rip_input(m, off, proto);
2290 return;
2291 }
2292 /* Drop the packet */
2293 m_freem(m);
2294}