ip: Put fast dispatch/slow dispatch and hashing done by IP under RSS_DEBUG
[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 *
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/*
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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 $
68 */
69
70#define _IP_VHL
71
72#include "opt_bootp.h"
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73#include "opt_ipdn.h"
74#include "opt_ipdivert.h"
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75#include "opt_ipstealth.h"
76#include "opt_ipsec.h"
fce0e0b4 77#include "opt_rss.h"
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78
79#include <sys/param.h>
80#include <sys/systm.h>
81#include <sys/mbuf.h>
82#include <sys/malloc.h>
2b89bacf 83#include <sys/mpipe.h>
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84#include <sys/domain.h>
85#include <sys/protosw.h>
86#include <sys/socket.h>
87#include <sys/time.h>
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88#include <sys/globaldata.h>
89#include <sys/thread.h>
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90#include <sys/kernel.h>
91#include <sys/syslog.h>
92#include <sys/sysctl.h>
3f9db7f8 93#include <sys/in_cksum.h>
8b3db995 94#include <sys/lock.h>
984263bc 95
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96#include <sys/mplock2.h>
97
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98#include <machine/stdarg.h>
99
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100#include <net/if.h>
101#include <net/if_types.h>
102#include <net/if_var.h>
103#include <net/if_dl.h>
e7e55f42 104#include <net/pfil.h>
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105#include <net/route.h>
106#include <net/netisr.h>
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107
108#include <netinet/in.h>
109#include <netinet/in_systm.h>
110#include <netinet/in_var.h>
111#include <netinet/ip.h>
112#include <netinet/in_pcb.h>
113#include <netinet/ip_var.h>
114#include <netinet/ip_icmp.h>
b0cb7c2c 115#include <netinet/ip_divert.h>
4639df5f 116#include <netinet/ip_flow.h>
984263bc 117
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118#include <sys/thread2.h>
119#include <sys/msgport2.h>
120#include <net/netmsg2.h>
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121
122#include <sys/socketvar.h>
123
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124#include <net/ipfw/ip_fw.h>
125#include <net/dummynet/ip_dummynet.h>
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126
127#ifdef IPSEC
128#include <netinet6/ipsec.h>
d2438d69 129#include <netproto/key/key.h>
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130#endif
131
132#ifdef FAST_IPSEC
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133#include <netproto/ipsec/ipsec.h>
134#include <netproto/ipsec/key.h>
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135#endif
136
137int rsvp_on = 0;
138static int ip_rsvp_on;
139struct socket *ip_rsvpd;
140
dffa46cd 141int ipforwarding = 0;
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142SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW,
143 &ipforwarding, 0, "Enable IP forwarding between interfaces");
144
dffa46cd 145static int ipsendredirects = 1; /* XXX */
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146SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
147 &ipsendredirects, 0, "Enable sending IP redirects");
148
dffa46cd 149int ip_defttl = IPDEFTTL;
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150SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
151 &ip_defttl, 0, "Maximum TTL on IP packets");
152
dffa46cd 153static int ip_dosourceroute = 0;
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154SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW,
155 &ip_dosourceroute, 0, "Enable forwarding source routed IP packets");
156
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157static int ip_acceptsourceroute = 0;
158SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
159 CTLFLAG_RW, &ip_acceptsourceroute, 0,
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160 "Enable accepting source routed IP packets");
161
dffa46cd 162static int ip_keepfaith = 0;
984263bc 163SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
dffa46cd 164 &ip_keepfaith, 0,
0ca0cd25 165 "Enable packet capture for FAITH IPv4->IPv6 translator daemon");
984263bc 166
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167static int nipq = 0; /* total # of reass queues */
168static int maxnipq;
984263bc 169SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW,
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170 &maxnipq, 0,
171 "Maximum number of IPv4 fragment reassembly queue entries");
984263bc 172
dffa46cd 173static int maxfragsperpacket;
984263bc 174SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
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175 &maxfragsperpacket, 0,
176 "Maximum number of IPv4 fragments allowed per packet");
984263bc 177
dffa46cd 178static int ip_sendsourcequench = 0;
984263bc 179SYSCTL_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
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180 &ip_sendsourcequench, 0,
181 "Enable the transmission of source quench packets");
984263bc 182
b6afe32a 183int ip_do_randomid = 1;
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184SYSCTL_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
185 &ip_do_randomid, 0,
186 "Assign random ip_id values");
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187/*
188 * XXX - Setting ip_checkinterface mostly implements the receive side of
189 * the Strong ES model described in RFC 1122, but since the routing table
190 * and transmit implementation do not implement the Strong ES model,
191 * setting this to 1 results in an odd hybrid.
192 *
193 * XXX - ip_checkinterface currently must be disabled if you use ipnat
194 * to translate the destination address to another local interface.
195 *
196 * XXX - ip_checkinterface must be disabled if you add IP aliases
197 * to the loopback interface instead of the interface where the
198 * packets for those addresses are received.
199 */
dffa46cd 200static int ip_checkinterface = 0;
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201SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
202 &ip_checkinterface, 0, "Verify packet arrives on correct interface");
203
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204static u_long ip_hash_count = 0;
205SYSCTL_ULONG(_net_inet_ip, OID_AUTO, hash_count, CTLFLAG_RD,
206 &ip_hash_count, 0, "Number of packets hashed by IP");
207
208#ifdef RSS_DEBUG
209static u_long ip_rehash_count = 0;
210SYSCTL_ULONG(_net_inet_ip, OID_AUTO, rehash_count, CTLFLAG_RD,
211 &ip_rehash_count, 0, "Number of packets rehashed by IP");
212
213static u_long ip_dispatch_fast = 0;
214SYSCTL_ULONG(_net_inet_ip, OID_AUTO, dispatch_fast_count, CTLFLAG_RD,
215 &ip_dispatch_fast, 0, "Number of packets handled on current CPU");
216
217static u_long ip_dispatch_slow = 0;
218SYSCTL_ULONG(_net_inet_ip, OID_AUTO, dispatch_slow_count, CTLFLAG_RD,
219 &ip_dispatch_slow, 0, "Number of packets messaged to another CPU");
220#endif
c3c96e44 221
a3c18566 222static struct lwkt_token ipq_token = LWKT_TOKEN_INITIALIZER(ipq_token);
2d23a8be 223
984263bc 224#ifdef DIAGNOSTIC
dffa46cd 225static int ipprintfs = 0;
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226#endif
227
984263bc 228extern struct domain inetdomain;
4468b0b4 229extern struct protosw inetsw[];
984263bc 230u_char ip_protox[IPPROTO_MAX];
1b562c24 231struct in_ifaddrhead in_ifaddrheads[MAXCPU]; /* first inet address */
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232struct in_ifaddrhashhead *in_ifaddrhashtbls[MAXCPU];
233 /* inet addr hash table */
984263bc 234u_long in_ifaddrhmask; /* mask for hash table */
dffa46cd 235
ae1d3076 236struct ip_stats ipstats_percpu[MAXCPU];
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237#ifdef SMP
238static int
239sysctl_ipstats(SYSCTL_HANDLER_ARGS)
240{
241 int cpu, error = 0;
242
243 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 244 if ((error = SYSCTL_OUT(req, &ipstats_percpu[cpu],
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245 sizeof(struct ip_stats))))
246 break;
ae1d3076 247 if ((error = SYSCTL_IN(req, &ipstats_percpu[cpu],
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248 sizeof(struct ip_stats))))
249 break;
250 }
251
252 return (error);
253}
254SYSCTL_PROC(_net_inet_ip, IPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
255 0, 0, sysctl_ipstats, "S,ip_stats", "IP statistics");
256#else
984263bc 257SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
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258 &ipstat, ip_stats, "IP statistics");
259#endif
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260
261/* Packet reassembly stuff */
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262#define IPREASS_NHASH_LOG2 6
263#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
264#define IPREASS_HMASK (IPREASS_NHASH - 1)
265#define IPREASS_HASH(x,y) \
266 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
984263bc 267
83c38804 268static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH];
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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
0030d31a
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282struct mbuf *(*ip_divert_p)(struct mbuf *, int, int);
283
e7e55f42 284struct pfil_head inet_pfil_hook;
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285
286/*
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287 * struct ip_srcrt_opt is used to store packet state while it travels
288 * through the stack.
289 *
290 * XXX Note that the code even makes assumptions on the size and
984263bc 291 * alignment of fields inside struct ip_srcrt so e.g. adding some
7e31206a 292 * fields will break the code. This needs to be fixed.
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293 *
294 * We need to save the IP options in case a protocol wants to respond
295 * to an incoming packet over the same route if the packet got here
296 * using IP source routing. This allows connection establishment and
297 * maintenance when the remote end is on a network that is not known
298 * to us.
299 */
7e31206a 300struct ip_srcrt {
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301 struct in_addr dst; /* final destination */
302 char nop; /* one NOP to align */
303 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
304 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
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305};
306
307struct ip_srcrt_opt {
308 int ip_nhops;
309 struct ip_srcrt ip_srcrt;
310};
984263bc 311
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312static MALLOC_DEFINE(M_IPQ, "ipq", "IP Fragment Management");
313static struct malloc_pipe ipq_mpipe;
314
7e31206a 315static void save_rte(struct mbuf *, u_char *, struct in_addr);
bb3b17df 316static int ip_dooptions(struct mbuf *m, int, struct sockaddr_in *);
83c38804 317static void ip_freef(struct ipqhead *, struct ipq *);
002c1265 318static void ip_input_handler(netmsg_t);
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319
320/*
321 * IP initialization: fill in IP protocol switch table.
322 * All protocols not implemented in kernel go to raw IP protocol handler.
323 */
324void
8a3125c6 325ip_init(void)
984263bc 326{
4468b0b4 327 struct protosw *pr;
2256ba69 328 int i;
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329#ifdef SMP
330 int cpu;
331#endif
984263bc 332
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333 /*
334 * Make sure we can handle a reasonable number of fragments but
335 * cap it at 4000 (XXX).
336 */
337 mpipe_init(&ipq_mpipe, M_IPQ, sizeof(struct ipq),
fdec03d6 338 IFQ_MAXLEN, 4000, 0, NULL, NULL, NULL);
f8983475 339 for (i = 0; i < ncpus; ++i) {
1b562c24 340 TAILQ_INIT(&in_ifaddrheads[i]);
f8983475
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341 in_ifaddrhashtbls[i] =
342 hashinit(INADDR_NHASH, M_IFADDR, &in_ifaddrhmask);
343 }
4468b0b4 344 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
dffa46cd 345 if (pr == NULL)
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346 panic("ip_init");
347 for (i = 0; i < IPPROTO_MAX; i++)
348 ip_protox[i] = pr - inetsw;
4468b0b4 349 for (pr = inetdomain.dom_protosw;
92db3805
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350 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
351 if (pr->pr_domain->dom_family == PF_INET && pr->pr_protocol) {
352 if (pr->pr_protocol != IPPROTO_RAW)
353 ip_protox[pr->pr_protocol] = pr - inetsw;
92db3805
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354 }
355 }
984263bc 356
e7e55f42
JR
357 inet_pfil_hook.ph_type = PFIL_TYPE_AF;
358 inet_pfil_hook.ph_af = AF_INET;
5e3f3b7a 359 if ((i = pfil_head_register(&inet_pfil_hook)) != 0) {
a6ec04bc 360 kprintf("%s: WARNING: unable to register pfil hook, "
e7e55f42 361 "error %d\n", __func__, i);
5e3f3b7a 362 }
e7e55f42 363
984263bc 364 for (i = 0; i < IPREASS_NHASH; i++)
83c38804 365 TAILQ_INIT(&ipq[i]);
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366
367 maxnipq = nmbclusters / 32;
368 maxfragsperpacket = 16;
369
984263bc 370 ip_id = time_second & 0xffff;
984263bc 371
fc9c7b4f 372 /*
ae1d3076 373 * Initialize IP statistics counters for each CPU.
fc9c7b4f 374 *
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375 */
376#ifdef SMP
377 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 378 bzero(&ipstats_percpu[cpu], sizeof(struct ip_stats));
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379 }
380#else
381 bzero(&ipstat, sizeof(struct ip_stats));
382#endif
383
c3c96e44 384 netisr_register(NETISR_IP, ip_input_handler, ip_cpufn_in);
e6f77b88 385 netisr_register_hashcheck(NETISR_IP, ip_hashcheck);
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386}
387
0c7ac0cd
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388/* Do transport protocol processing. */
389static void
5de23090 390transport_processing_oncpu(struct mbuf *m, int hlen, struct ip *ip)
0c7ac0cd 391{
92db3805
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392 const struct protosw *pr = &inetsw[ip_protox[ip->ip_p]];
393
0c7ac0cd
JH
394 /*
395 * Switch out to protocol's input routine.
396 */
92db3805 397 PR_GET_MPLOCK(pr);
002c1265 398 pr->pr_input(&m, &hlen, ip->ip_p);
92db3805 399 PR_REL_MPLOCK(pr);
0c7ac0cd
JH
400}
401
4599cf19 402static void
002c1265 403transport_processing_handler(netmsg_t msg)
0c7ac0cd 404{
002c1265 405 struct netmsg_packet *pmsg = &msg->packet;
0c7ac0cd 406 struct ip *ip;
3d6057fe
SZ
407 int hlen;
408
409 ip = mtod(pmsg->nm_packet, struct ip *);
002c1265 410 hlen = pmsg->base.lmsg.u.ms_result;
0c7ac0cd 411
3d6057fe 412 transport_processing_oncpu(pmsg->nm_packet, hlen, ip);
002c1265 413 /* msg was embedded in the mbuf, do not reply! */
0c7ac0cd
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414}
415
4599cf19 416static void
002c1265 417ip_input_handler(netmsg_t msg)
4f277347 418{
002c1265
MD
419 ip_input(msg->packet.nm_packet);
420 /* msg was embedded in the mbuf, do not reply! */
4f277347
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421}
422
984263bc 423/*
590b8cd4 424 * IP input routine. Checksum and byte swap header. If fragmented
984263bc
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425 * try to reassemble. Process options. Pass to next level.
426 */
427void
4f277347 428ip_input(struct mbuf *m)
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429{
430 struct ip *ip;
984263bc 431 struct in_ifaddr *ia = NULL;
f8983475 432 struct in_ifaddr_container *iac;
8c6081b9 433 int hlen, checkif;
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MD
434 u_short sum;
435 struct in_addr pkt_dst;
dffa46cd 436 boolean_t using_srcrt = FALSE; /* forward (by PFIL_HOOKS) */
e7e55f42 437 struct in_addr odst; /* original dst address(NAT) */
984263bc 438 struct m_tag *mtag;
5de23090 439 struct sockaddr_in *next_hop = NULL;
6a704092 440 lwkt_port_t port;
e5ecc832 441#ifdef FAST_IPSEC
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MD
442 struct tdb_ident *tdbi;
443 struct secpolicy *sp;
1cae611f 444 int error;
dffa46cd 445#endif
984263bc 446
814907cb 447 M_ASSERTPKTHDR(m);
984263bc 448
6a704092 449 /*
c3c96e44
MD
450 * This routine is called from numerous places which may not have
451 * characterized the packet.
6a704092 452 */
c3c96e44 453 if ((m->m_flags & M_HASH) == 0) {
fce0e0b4 454 atomic_add_long(&ip_hash_count, 1);
c3c96e44
MD
455 ip_cpufn(&m, 0, IP_MPORT_IN);
456 if (m == NULL)
457 return;
458 KKASSERT(m->m_flags & M_HASH);
459 }
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460 ip = mtod(m, struct ip *);
461
462 /*
463 * Pull out certain tags
464 */
5de23090
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465 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
466 /* Next hop */
467 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
468 KKASSERT(mtag != NULL);
469 next_hop = m_tag_data(mtag);
470 }
471
eb241549 472 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
eb241549 473 /* dummynet already filtered us */
984263bc
MD
474 ip = mtod(m, struct ip *);
475 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
dffa46cd 476 goto iphack;
984263bc
MD
477 }
478
479 ipstat.ips_total++;
480
c3c96e44 481 /* length checks already done in ip_cpufn() */
47d96de7 482 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf"));
984263bc
MD
483
484 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
485 ipstat.ips_badvers++;
486 goto bad;
487 }
488
489 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
c3c96e44 490 /* length checks already done in ip_cpufn() */
9babcab8 491 KASSERT(hlen >= sizeof(struct ip), ("IP header len too small"));
9b161cc2 492 KASSERT(m->m_len >= hlen, ("complete IP header not in one mbuf"));
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493
494 /* 127/8 must not appear on wire - RFC1122 */
495 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
496 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
dffa46cd 497 if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) {
984263bc
MD
498 ipstat.ips_badaddr++;
499 goto bad;
500 }
501 }
502
503 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
504 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
505 } else {
459837b1 506 if (hlen == sizeof(struct ip))
984263bc 507 sum = in_cksum_hdr(ip);
459837b1 508 else
984263bc 509 sum = in_cksum(m, hlen);
984263bc 510 }
5fe66e68 511 if (sum != 0) {
984263bc
MD
512 ipstat.ips_badsum++;
513 goto bad;
514 }
515
4d723e5a
JS
516#ifdef ALTQ
517 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
518 /* packet is dropped by traffic conditioner */
519 return;
520 }
521#endif
984263bc
MD
522 /*
523 * Convert fields to host representation.
524 */
525 ip->ip_len = ntohs(ip->ip_len);
984263bc
MD
526 ip->ip_off = ntohs(ip->ip_off);
527
c3c96e44 528 /* length checks already done in ip_cpufn() */
9b161cc2
SZ
529 KASSERT(ip->ip_len >= hlen, ("total length less then header length"));
530 KASSERT(m->m_pkthdr.len >= ip->ip_len, ("mbuf too short"));
531
984263bc 532 /*
9b161cc2 533 * Trim mbufs if longer than the IP header would have us expect.
984263bc 534 */
984263bc
MD
535 if (m->m_pkthdr.len > ip->ip_len) {
536 if (m->m_len == m->m_pkthdr.len) {
537 m->m_len = ip->ip_len;
538 m->m_pkthdr.len = ip->ip_len;
459837b1 539 } else {
984263bc 540 m_adj(m, ip->ip_len - m->m_pkthdr.len);
459837b1 541 }
984263bc
MD
542 }
543#if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
544 /*
545 * Bypass packet filtering for packets from a tunnel (gif).
546 */
547 if (ipsec_gethist(m, NULL))
548 goto pass;
549#endif
550
551 /*
552 * IpHack's section.
553 * Right now when no processing on packet has done
554 * and it is still fresh out of network we do our black
555 * deals with it.
556 * - Firewall: deny/allow/divert
557 * - Xlate: translate packet's addr/port (NAT).
558 * - Pipe: pass pkt through dummynet.
559 * - Wrap: fake packet's addr/port <unimpl.>
560 * - Encapsulate: put it in another IP and send out. <unimp.>
dffa46cd 561 */
984263bc
MD
562
563iphack:
a5d1fda3
SZ
564 /*
565 * If we've been forwarded from the output side, then
566 * skip the firewall a second time
567 */
568 if (next_hop != NULL)
569 goto ours;
dffa46cd 570
a93c9c2f
SZ
571 /* No pfil hooks */
572 if (!pfil_has_hooks(&inet_pfil_hook)) {
573 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
574 /*
575 * Strip dummynet tags from stranded packets
576 */
577 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
578 KKASSERT(mtag != NULL);
579 m_tag_delete(m, mtag);
580 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
581 }
582 goto pass;
583 }
584
984263bc 585 /*
e7e55f42
JR
586 * Run through list of hooks for input packets.
587 *
c3c96e44
MD
588 * NOTE! If the packet is rewritten pf/ipfw/whoever must
589 * clear M_HASH.
984263bc 590 */
a93c9c2f
SZ
591 odst = ip->ip_dst;
592 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN))
593 return;
594 if (m == NULL) /* consumed by filter */
595 return;
596 ip = mtod(m, struct ip *);
597 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
598 using_srcrt = (odst.s_addr != ip->ip_dst.s_addr);
dffa46cd 599
a5d1fda3
SZ
600 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
601 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
602 KKASSERT(mtag != NULL);
603 next_hop = m_tag_data(mtag);
604 }
e4d4f9c3
SZ
605 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
606 ip_dn_queue(m);
607 return;
608 }
012d335d 609 if (m->m_pkthdr.fw_flags & FW_MBUF_REDISPATCH) {
012d335d
SZ
610 m->m_pkthdr.fw_flags &= ~FW_MBUF_REDISPATCH;
611 }
8c6081b9 612pass:
984263bc
MD
613 /*
614 * Process options and, if not destined for us,
615 * ship it on. ip_dooptions returns 1 when an
616 * error was detected (causing an icmp message
617 * to be sent and the original packet to be freed).
618 */
5de23090 619 if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, next_hop))
984263bc
MD
620 return;
621
dffa46cd
JH
622 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
623 * matter if it is destined to another node, or whether it is
624 * a multicast one, RSVP wants it! and prevents it from being forwarded
625 * anywhere else. Also checks if the rsvp daemon is running before
984263bc 626 * grabbing the packet.
dffa46cd
JH
627 */
628 if (rsvp_on && ip->ip_p == IPPROTO_RSVP)
984263bc
MD
629 goto ours;
630
631 /*
632 * Check our list of addresses, to see if the packet is for us.
633 * If we don't have any addresses, assume any unicast packet
634 * we receive might be for us (and let the upper layers deal
635 * with it).
636 */
1b562c24
SZ
637 if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid]) &&
638 !(m->m_flags & (M_MCAST | M_BCAST)))
984263bc
MD
639 goto ours;
640
641 /*
642 * Cache the destination address of the packet; this may be
643 * changed by use of 'ipfw fwd'.
644 */
5de23090 645 pkt_dst = next_hop ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
646
647 /*
648 * Enable a consistency check between the destination address
649 * and the arrival interface for a unicast packet (the RFC 1122
650 * strong ES model) if IP forwarding is disabled and the packet
651 * is not locally generated and the packet is not subject to
652 * 'ipfw fwd'.
653 *
654 * XXX - Checking also should be disabled if the destination
655 * address is ipnat'ed to a different interface.
656 *
657 * XXX - Checking is incompatible with IP aliases added
658 * to the loopback interface instead of the interface where
659 * the packets are received.
660 */
dffa46cd
JH
661 checkif = ip_checkinterface &&
662 !ipforwarding &&
663 m->m_pkthdr.rcvif != NULL &&
664 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
5de23090 665 next_hop == NULL;
984263bc
MD
666
667 /*
668 * Check for exact addresses in the hash bucket.
669 */
f8983475
SZ
670 LIST_FOREACH(iac, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
671 ia = iac->ia;
672
984263bc
MD
673 /*
674 * If the address matches, verify that the packet
675 * arrived via the correct interface if checking is
676 * enabled.
677 */
dffa46cd 678 if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
984263bc
MD
679 (!checkif || ia->ia_ifp == m->m_pkthdr.rcvif))
680 goto ours;
681 }
f8983475
SZ
682 ia = NULL;
683
984263bc
MD
684 /*
685 * Check for broadcast addresses.
686 *
687 * Only accept broadcast packets that arrive via the matching
688 * interface. Reception of forwarded directed broadcasts would
689 * be handled via ip_forward() and ether_output() with the loopback
690 * into the stack for SIMPLEX interfaces handled by ether_output().
691 */
692 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
b2632176
SZ
693 struct ifaddr_container *ifac;
694
695 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid],
696 ifa_link) {
697 struct ifaddr *ifa = ifac->ifa;
698
83a415f4
MD
699 if (ifa->ifa_addr == NULL) /* shutdown/startup race */
700 continue;
984263bc
MD
701 if (ifa->ifa_addr->sa_family != AF_INET)
702 continue;
703 ia = ifatoia(ifa);
704 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
dffa46cd 705 pkt_dst.s_addr)
984263bc
MD
706 goto ours;
707 if (ia->ia_netbroadcast.s_addr == pkt_dst.s_addr)
708 goto ours;
709#ifdef BOOTP_COMPAT
710 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
711 goto ours;
712#endif
713 }
714 }
715 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
716 struct in_multi *inm;
5fe66e68 717
87b66be9
SZ
718 /* XXX Multicast is not MPSAFE yet */
719 get_mplock();
720
5fe66e68 721 if (ip_mrouter != NULL) {
984263bc
MD
722 /*
723 * If we are acting as a multicast router, all
724 * incoming multicast packets are passed to the
725 * kernel-level multicast forwarding function.
726 * The packet is returned (relatively) intact; if
727 * ip_mforward() returns a non-zero value, the packet
728 * must be discarded, else it may be accepted below.
729 */
5fe66e68 730 if (ip_mforward != NULL &&
dffa46cd 731 ip_mforward(ip, m->m_pkthdr.rcvif, m, NULL) != 0) {
87b66be9 732 rel_mplock();
984263bc
MD
733 ipstat.ips_cantforward++;
734 m_freem(m);
735 return;
736 }
737
738 /*
739 * The process-level routing daemon needs to receive
740 * all multicast IGMP packets, whether or not this
741 * host belongs to their destination groups.
742 */
87b66be9
SZ
743 if (ip->ip_p == IPPROTO_IGMP) {
744 rel_mplock();
984263bc 745 goto ours;
87b66be9 746 }
984263bc
MD
747 ipstat.ips_forward++;
748 }
749 /*
750 * See if we belong to the destination multicast group on the
751 * arrival interface.
752 */
753 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
754 if (inm == NULL) {
87b66be9 755 rel_mplock();
984263bc
MD
756 ipstat.ips_notmember++;
757 m_freem(m);
758 return;
759 }
87b66be9
SZ
760
761 rel_mplock();
984263bc
MD
762 goto ours;
763 }
dffa46cd 764 if (ip->ip_dst.s_addr == INADDR_BROADCAST)
984263bc
MD
765 goto ours;
766 if (ip->ip_dst.s_addr == INADDR_ANY)
767 goto ours;
768
769 /*
770 * FAITH(Firewall Aided Internet Translator)
771 */
772 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
773 if (ip_keepfaith) {
dffa46cd 774 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
984263bc
MD
775 goto ours;
776 }
777 m_freem(m);
778 return;
779 }
780
781 /*
782 * Not for us; forward if possible and desirable.
783 */
dffa46cd 784 if (!ipforwarding) {
984263bc
MD
785 ipstat.ips_cantforward++;
786 m_freem(m);
787 } else {
788#ifdef IPSEC
789 /*
790 * Enforce inbound IPsec SPD.
791 */
792 if (ipsec4_in_reject(m, NULL)) {
793 ipsecstat.in_polvio++;
794 goto bad;
795 }
dffa46cd 796#endif
984263bc
MD
797#ifdef FAST_IPSEC
798 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 799 crit_enter();
984263bc 800 if (mtag != NULL) {
d031aa80 801 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
802 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
803 } else {
804 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 805 IP_FORWARDING, &error);
984263bc
MD
806 }
807 if (sp == NULL) { /* NB: can happen if error */
1cae611f 808 crit_exit();
984263bc
MD
809 /*XXX error stat???*/
810 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
811 goto bad;
812 }
813
814 /*
815 * Check security policy against packet attributes.
816 */
817 error = ipsec_in_reject(sp, m);
818 KEY_FREESP(&sp);
1cae611f 819 crit_exit();
984263bc
MD
820 if (error) {
821 ipstat.ips_cantforward++;
822 goto bad;
823 }
dffa46cd 824#endif
5de23090 825 ip_forward(m, using_srcrt, next_hop);
984263bc
MD
826 }
827 return;
828
829ours:
dffa46cd 830
984263bc
MD
831 /*
832 * IPSTEALTH: Process non-routing options only
833 * if the packet is destined for us.
834 */
dffa46cd
JH
835 if (ipstealth &&
836 hlen > sizeof(struct ip) &&
5de23090 837 ip_dooptions(m, 1, next_hop))
984263bc 838 return;
984263bc
MD
839
840 /* Count the packet in the ip address stats */
841 if (ia != NULL) {
842 ia->ia_ifa.if_ipackets++;
843 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
844 }
845
846 /*
847 * If offset or IP_MF are set, must reassemble.
848 * Otherwise, nothing need be done.
849 * (We could look in the reassembly queue to see
850 * if the packet was previously fragmented,
851 * but it's not worth the time; just let them time out.)
852 */
853 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
984263bc 854 /*
c3c96e44
MD
855 * Attempt reassembly; if it succeeds, proceed. ip_reass()
856 * will return a different mbuf.
857 *
858 * NOTE: ip_reass() returns m with M_HASH cleared to force
859 * us to recharacterize the packet.
984263bc 860 */
b0cb7c2c 861 m = ip_reass(m);
dffa46cd 862 if (m == NULL)
984263bc 863 return;
984263bc 864 ip = mtod(m, struct ip *);
b0cb7c2c 865
984263bc
MD
866 /* Get the header length of the reassembled packet */
867 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
bf82f9b7 868 } else {
984263bc 869 ip->ip_len -= hlen;
bf82f9b7 870 }
984263bc 871
984263bc
MD
872#ifdef IPSEC
873 /*
874 * enforce IPsec policy checking if we are seeing last header.
875 * note that we do not visit this with protocols with pcb layer
876 * code - like udp/tcp/raw ip.
877 */
dffa46cd 878 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) &&
984263bc
MD
879 ipsec4_in_reject(m, NULL)) {
880 ipsecstat.in_polvio++;
881 goto bad;
882 }
883#endif
884#if FAST_IPSEC
885 /*
886 * enforce IPsec policy checking if we are seeing last header.
887 * note that we do not visit this with protocols with pcb layer
888 * code - like udp/tcp/raw ip.
889 */
dffa46cd 890 if (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) {
984263bc
MD
891 /*
892 * Check if the packet has already had IPsec processing
893 * done. If so, then just pass it along. This tag gets
894 * set during AH, ESP, etc. input handling, before the
895 * packet is returned to the ip input queue for delivery.
dffa46cd 896 */
984263bc 897 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 898 crit_enter();
984263bc 899 if (mtag != NULL) {
d031aa80 900 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
901 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
902 } else {
903 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 904 IP_FORWARDING, &error);
984263bc
MD
905 }
906 if (sp != NULL) {
907 /*
908 * Check security policy against packet attributes.
909 */
910 error = ipsec_in_reject(sp, m);
911 KEY_FREESP(&sp);
912 } else {
913 /* XXX error stat??? */
914 error = EINVAL;
915DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
916 goto bad;
917 }
1cae611f 918 crit_exit();
984263bc
MD
919 if (error)
920 goto bad;
921 }
922#endif /* FAST_IPSEC */
923
a40c0023 924 /*
6a704092
MD
925 * We must forward the packet to the correct protocol thread if
926 * we are not already in it.
c3c96e44
MD
927 *
928 * NOTE: ip_len is now in host form. ip_len is not adjusted
929 * further for protocol processing, instead we pass hlen
930 * to the protosw and let it deal with it.
a40c0023 931 */
984263bc 932 ipstat.ips_delivered++;
984263bc 933
c3c96e44 934 if ((m->m_flags & M_HASH) == 0) {
fce0e0b4
SZ
935#ifdef RSS_DEBUG
936 atomic_add_long(&ip_rehash_count, 1);
937#endif
76c4458a 938 ip->ip_len = htons(ip->ip_len + hlen);
c3c96e44
MD
939 ip->ip_off = htons(ip->ip_off);
940
941 ip_cpufn(&m, 0, IP_MPORT_IN);
942 if (m == NULL)
943 return;
944
945 ip = mtod(m, struct ip *);
76c4458a 946 ip->ip_len = ntohs(ip->ip_len) - hlen;
c3c96e44
MD
947 ip->ip_off = ntohs(ip->ip_off);
948 KKASSERT(m->m_flags & M_HASH);
949 }
950 port = cpu_portfn(m->m_pkthdr.hash);
951
6a704092
MD
952 if (port != &curthread->td_msgport) {
953 struct netmsg_packet *pmsg;
35658e20 954
fce0e0b4
SZ
955#ifdef RSS_DEBUG
956 atomic_add_long(&ip_dispatch_slow, 1);
957#endif
c3c96e44 958
3d6057fe 959 pmsg = &m->m_hdr.mh_netmsg;
002c1265 960 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
c3c96e44 961 0, transport_processing_handler);
3d6057fe 962 pmsg->nm_packet = m;
002c1265
MD
963 pmsg->base.lmsg.u.ms_result = hlen;
964 lwkt_sendmsg(port, &pmsg->base.lmsg);
0c7ac0cd 965 } else {
fce0e0b4
SZ
966#ifdef RSS_DEBUG
967 atomic_add_long(&ip_dispatch_fast, 1);
968#endif
5de23090 969 transport_processing_oncpu(m, hlen, ip);
bf82f9b7 970 }
984263bc 971 return;
a80cf23b 972
984263bc
MD
973bad:
974 m_freem(m);
975}
976
977/*
984263bc
MD
978 * Take incoming datagram fragment and try to reassemble it into
979 * whole datagram. If a chain for reassembly of this datagram already
980 * exists, then it is given as fp; otherwise have to make a chain.
984263bc 981 */
0030d31a 982struct mbuf *
b0cb7c2c 983ip_reass(struct mbuf *m)
984263bc
MD
984{
985 struct ip *ip = mtod(m, struct ip *);
dffa46cd 986 struct mbuf *p = NULL, *q, *nq;
2b89bacf 987 struct mbuf *n;
9691feb6 988 struct ipq *fp = NULL;
83c38804 989 struct ipqhead *head;
984263bc
MD
990 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
991 int i, next;
9691feb6 992 u_short sum;
984263bc 993
9691feb6
SZ
994 /* If maxnipq is 0, never accept fragments. */
995 if (maxnipq == 0) {
996 ipstat.ips_fragments++;
997 ipstat.ips_fragdropped++;
998 m_freem(m);
999 return NULL;
1000 }
1001
1002 sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
1003 /*
1004 * Look for queue of fragments of this datagram.
1005 */
2d23a8be 1006 lwkt_gettoken(&ipq_token);
83c38804
PA
1007 head = &ipq[sum];
1008 TAILQ_FOREACH(fp, head, ipq_list) {
9691feb6
SZ
1009 if (ip->ip_id == fp->ipq_id &&
1010 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
1011 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
1012 ip->ip_p == fp->ipq_p)
1013 goto found;
2d23a8be 1014 }
9691feb6
SZ
1015
1016 fp = NULL;
1017
1018 /*
1019 * Enforce upper bound on number of fragmented packets
1020 * for which we attempt reassembly;
1021 * If maxnipq is -1, accept all fragments without limitation.
1022 */
1023 if (nipq > maxnipq && maxnipq > 0) {
1024 /*
1025 * drop something from the tail of the current queue
1026 * before proceeding further
1027 */
83c38804
PA
1028 struct ipq *q = TAILQ_LAST(head, ipqhead);
1029 if (q == NULL) {
1030 /*
1031 * The current queue is empty,
1032 * so drop from one of the others.
1033 */
9691feb6 1034 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1035 struct ipq *r = TAILQ_LAST(&ipq[i], ipqhead);
1036 if (r) {
1037 ipstat.ips_fragtimeout += r->ipq_nfrags;
1038 ip_freef(&ipq[i], r);
9691feb6
SZ
1039 break;
1040 }
1041 }
1042 } else {
83c38804
PA
1043 ipstat.ips_fragtimeout += q->ipq_nfrags;
1044 ip_freef(head, q);
9691feb6
SZ
1045 }
1046 }
1047found:
1048 /*
1049 * Adjust ip_len to not reflect header,
1050 * convert offset of this to bytes.
1051 */
1052 ip->ip_len -= hlen;
1053 if (ip->ip_off & IP_MF) {
1054 /*
1055 * Make sure that fragments have a data length
1056 * that's a non-zero multiple of 8 bytes.
1057 */
1058 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1059 ipstat.ips_toosmall++; /* XXX */
1060 m_freem(m);
2d23a8be 1061 goto done;
9691feb6
SZ
1062 }
1063 m->m_flags |= M_FRAG;
2d23a8be 1064 } else {
9691feb6 1065 m->m_flags &= ~M_FRAG;
2d23a8be 1066 }
9691feb6
SZ
1067 ip->ip_off <<= 3;
1068
1069 ipstat.ips_fragments++;
1070 m->m_pkthdr.header = ip;
1071
984263bc 1072 /*
fbb35ef0
SZ
1073 * If the hardware has not done csum over this fragment
1074 * then csum_data is not valid at all.
1075 */
1076 if ((m->m_pkthdr.csum_flags & (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID))
1077 == (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID)) {
1078 m->m_pkthdr.csum_data = 0;
1079 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
1080 }
1081
1082 /*
984263bc
MD
1083 * Presence of header sizes in mbufs
1084 * would confuse code below.
1085 */
1086 m->m_data += hlen;
1087 m->m_len -= hlen;
1088
1089 /*
1090 * If first fragment to arrive, create a reassembly queue.
1091 */
dffa46cd 1092 if (fp == NULL) {
2b89bacf 1093 if ((fp = mpipe_alloc_nowait(&ipq_mpipe)) == NULL)
984263bc 1094 goto dropfrag;
83c38804 1095 TAILQ_INSERT_HEAD(head, fp, ipq_list);
984263bc
MD
1096 nipq++;
1097 fp->ipq_nfrags = 1;
1098 fp->ipq_ttl = IPFRAGTTL;
1099 fp->ipq_p = ip->ip_p;
1100 fp->ipq_id = ip->ip_id;
1101 fp->ipq_src = ip->ip_src;
1102 fp->ipq_dst = ip->ip_dst;
1103 fp->ipq_frags = m;
1104 m->m_nextpkt = NULL;
984263bc
MD
1105 goto inserted;
1106 } else {
1107 fp->ipq_nfrags++;
1108 }
1109
dffa46cd 1110#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
984263bc
MD
1111
1112 /*
1113 * Find a segment which begins after this one does.
1114 */
2d23a8be 1115 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
984263bc
MD
1116 if (GETIP(q)->ip_off > ip->ip_off)
1117 break;
2d23a8be 1118 }
984263bc
MD
1119
1120 /*
1121 * If there is a preceding segment, it may provide some of
1122 * our data already. If so, drop the data from the incoming
1123 * segment. If it provides all of our data, drop us, otherwise
1124 * stick new segment in the proper place.
1125 *
1126 * If some of the data is dropped from the the preceding
1127 * segment, then it's checksum is invalidated.
1128 */
1129 if (p) {
1130 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1131 if (i > 0) {
1132 if (i >= ip->ip_len)
1133 goto dropfrag;
1134 m_adj(m, i);
1135 m->m_pkthdr.csum_flags = 0;
1136 ip->ip_off += i;
1137 ip->ip_len -= i;
1138 }
1139 m->m_nextpkt = p->m_nextpkt;
1140 p->m_nextpkt = m;
1141 } else {
1142 m->m_nextpkt = fp->ipq_frags;
1143 fp->ipq_frags = m;
1144 }
1145
1146 /*
1147 * While we overlap succeeding segments trim them or,
1148 * if they are completely covered, dequeue them.
1149 */
1150 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1151 q = nq) {
dffa46cd 1152 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
984263bc
MD
1153 if (i < GETIP(q)->ip_len) {
1154 GETIP(q)->ip_len -= i;
1155 GETIP(q)->ip_off += i;
1156 m_adj(q, i);
1157 q->m_pkthdr.csum_flags = 0;
1158 break;
1159 }
1160 nq = q->m_nextpkt;
1161 m->m_nextpkt = nq;
1162 ipstat.ips_fragdropped++;
1163 fp->ipq_nfrags--;
c4933956 1164 q->m_nextpkt = NULL;
984263bc
MD
1165 m_freem(q);
1166 }
1167
1168inserted:
984263bc
MD
1169 /*
1170 * Check for complete reassembly and perform frag per packet
1171 * limiting.
1172 *
1173 * Frag limiting is performed here so that the nth frag has
1174 * a chance to complete the packet before we drop the packet.
1175 * As a result, n+1 frags are actually allowed per packet, but
1176 * only n will ever be stored. (n = maxfragsperpacket.)
1177 *
1178 */
1179 next = 0;
1180 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1181 if (GETIP(q)->ip_off != next) {
1182 if (fp->ipq_nfrags > maxfragsperpacket) {
1183 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1184 ip_freef(head, fp);
984263bc 1185 }
2d23a8be 1186 goto done;
984263bc
MD
1187 }
1188 next += GETIP(q)->ip_len;
1189 }
1190 /* Make sure the last packet didn't have the IP_MF flag */
1191 if (p->m_flags & M_FRAG) {
1192 if (fp->ipq_nfrags > maxfragsperpacket) {
1193 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1194 ip_freef(head, fp);
984263bc 1195 }
2d23a8be 1196 goto done;
984263bc
MD
1197 }
1198
1199 /*
1200 * Reassembly is complete. Make sure the packet is a sane size.
1201 */
1202 q = fp->ipq_frags;
1203 ip = GETIP(q);
1204 if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
1205 ipstat.ips_toolong++;
1206 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1207 ip_freef(head, fp);
2d23a8be 1208 goto done;
984263bc
MD
1209 }
1210
1211 /*
1212 * Concatenate fragments.
1213 */
1214 m = q;
2b89bacf 1215 n = m->m_next;
dffa46cd 1216 m->m_next = NULL;
2b89bacf 1217 m_cat(m, n);
984263bc 1218 nq = q->m_nextpkt;
dffa46cd 1219 q->m_nextpkt = NULL;
984263bc
MD
1220 for (q = nq; q != NULL; q = nq) {
1221 nq = q->m_nextpkt;
1222 q->m_nextpkt = NULL;
1223 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1224 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1225 m_cat(m, q);
1226 }
1227
1e7aea7f
MD
1228 /*
1229 * Clean up the 1's complement checksum. Carry over 16 bits must
1230 * be added back. This assumes no more then 65535 packet fragments
37ed010a 1231 * were reassembled. A second carry can also occur (but not a third).
1e7aea7f
MD
1232 */
1233 m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) +
1234 (m->m_pkthdr.csum_data >> 16);
37ed010a
MD
1235 if (m->m_pkthdr.csum_data > 0xFFFF)
1236 m->m_pkthdr.csum_data -= 0xFFFF;
1e7aea7f 1237
984263bc
MD
1238 /*
1239 * Create header for new ip packet by
1240 * modifying header of first packet;
1241 * dequeue and discard fragment reassembly header.
1242 * Make header visible.
1243 */
1244 ip->ip_len = next;
1245 ip->ip_src = fp->ipq_src;
1246 ip->ip_dst = fp->ipq_dst;
83c38804 1247 TAILQ_REMOVE(head, fp, ipq_list);
984263bc 1248 nipq--;
2b89bacf 1249 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1250 m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
1251 m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
1252 /* some debugging cruft by sklower, below, will go away soon */
1253 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
2256ba69 1254 int plen = 0;
dffa46cd 1255
2b89bacf
MD
1256 for (n = m; n; n = n->m_next)
1257 plen += n->m_len;
984263bc
MD
1258 m->m_pkthdr.len = plen;
1259 }
d2f6f5b2 1260
c3c96e44
MD
1261 /*
1262 * Reassembly complete, return the next protocol.
1263 *
1264 * Be sure to clear M_HASH to force the packet
1265 * to be re-characterized.
1266 *
1267 * Clear M_FRAG, we are no longer a fragment.
1268 */
1269 m->m_flags &= ~(M_HASH | M_FRAG);
1270
d2f6f5b2 1271 ipstat.ips_reassembled++;
2d23a8be 1272 lwkt_reltoken(&ipq_token);
984263bc
MD
1273 return (m);
1274
1275dropfrag:
984263bc 1276 ipstat.ips_fragdropped++;
dffa46cd 1277 if (fp != NULL)
984263bc
MD
1278 fp->ipq_nfrags--;
1279 m_freem(m);
2d23a8be
MD
1280done:
1281 lwkt_reltoken(&ipq_token);
dffa46cd 1282 return (NULL);
984263bc
MD
1283
1284#undef GETIP
1285}
1286
1287/*
1288 * Free a fragment reassembly header and all
1289 * associated datagrams.
2d23a8be
MD
1290 *
1291 * Called with ipq_token held.
984263bc
MD
1292 */
1293static void
83c38804 1294ip_freef(struct ipqhead *fhp, struct ipq *fp)
984263bc 1295{
2256ba69 1296 struct mbuf *q;
984263bc 1297
2d23a8be
MD
1298 /*
1299 * Remove first to protect against blocking
1300 */
83c38804 1301 TAILQ_REMOVE(fhp, fp, ipq_list);
2d23a8be
MD
1302
1303 /*
1304 * Clean out at our leisure
1305 */
984263bc
MD
1306 while (fp->ipq_frags) {
1307 q = fp->ipq_frags;
1308 fp->ipq_frags = q->m_nextpkt;
c4933956 1309 q->m_nextpkt = NULL;
984263bc
MD
1310 m_freem(q);
1311 }
2b89bacf 1312 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1313 nipq--;
1314}
1315
1316/*
1317 * IP timer processing;
1318 * if a timer expires on a reassembly
1319 * queue, discard it.
1320 */
1321void
8a3125c6 1322ip_slowtimo(void)
984263bc 1323{
83c38804
PA
1324 struct ipq *fp, *fp_temp;
1325 struct ipqhead *head;
984263bc
MD
1326 int i;
1327
2d23a8be 1328 lwkt_gettoken(&ipq_token);
984263bc 1329 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1330 head = &ipq[i];
1331 TAILQ_FOREACH_MUTABLE(fp, head, ipq_list, fp_temp) {
1332 if (--fp->ipq_ttl == 0) {
1333 ipstat.ips_fragtimeout += fp->ipq_nfrags;
1334 ip_freef(head, fp);
984263bc
MD
1335 }
1336 }
1337 }
1338 /*
1339 * If we are over the maximum number of fragments
1340 * (due to the limit being lowered), drain off
1341 * enough to get down to the new limit.
1342 */
1343 if (maxnipq >= 0 && nipq > maxnipq) {
1344 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1345 head = &ipq[i];
1346 while (nipq > maxnipq && !TAILQ_EMPTY(head)) {
984263bc 1347 ipstat.ips_fragdropped +=
83c38804
PA
1348 TAILQ_FIRST(head)->ipq_nfrags;
1349 ip_freef(head, TAILQ_FIRST(head));
984263bc
MD
1350 }
1351 }
1352 }
2d23a8be 1353 lwkt_reltoken(&ipq_token);
984263bc 1354 ipflow_slowtimo();
984263bc
MD
1355}
1356
1357/*
1358 * Drain off all datagram fragments.
1359 */
1360void
8a3125c6 1361ip_drain(void)
984263bc 1362{
83c38804 1363 struct ipqhead *head;
dffa46cd 1364 int i;
984263bc 1365
2d23a8be 1366 lwkt_gettoken(&ipq_token);
984263bc 1367 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1368 head = &ipq[i];
1369 while (!TAILQ_EMPTY(head)) {
1370 ipstat.ips_fragdropped += TAILQ_FIRST(head)->ipq_nfrags;
1371 ip_freef(head, TAILQ_FIRST(head));
984263bc
MD
1372 }
1373 }
2d23a8be 1374 lwkt_reltoken(&ipq_token);
984263bc
MD
1375 in_rtqdrain();
1376}
1377
1378/*
1379 * Do option processing on a datagram,
1380 * possibly discarding it if bad options are encountered,
1381 * or forwarding it if source-routed.
1382 * The pass argument is used when operating in the IPSTEALTH
1383 * mode to tell what options to process:
1384 * [LS]SRR (pass 0) or the others (pass 1).
1385 * The reason for as many as two passes is that when doing IPSTEALTH,
1386 * non-routing options should be processed only if the packet is for us.
1387 * Returns 1 if packet has been forwarded/freed,
1388 * 0 if the packet should be processed further.
1389 */
1390static int
1391ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop)
1392{
407e896e 1393 struct sockaddr_in ipaddr = { sizeof ipaddr, AF_INET };
984263bc
MD
1394 struct ip *ip = mtod(m, struct ip *);
1395 u_char *cp;
1396 struct in_ifaddr *ia;
dffa46cd
JH
1397 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB;
1398 boolean_t forward = FALSE;
984263bc
MD
1399 struct in_addr *sin, dst;
1400 n_time ntime;
1401
1402 dst = ip->ip_dst;
1403 cp = (u_char *)(ip + 1);
dffa46cd 1404 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1405 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1406 opt = cp[IPOPT_OPTVAL];
1407 if (opt == IPOPT_EOL)
1408 break;
1409 if (opt == IPOPT_NOP)
1410 optlen = 1;
1411 else {
1412 if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1413 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1414 goto bad;
1415 }
1416 optlen = cp[IPOPT_OLEN];
1417 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1418 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1419 goto bad;
1420 }
1421 }
1422 switch (opt) {
1423
1424 default:
1425 break;
1426
1427 /*
1428 * Source routing with record.
1429 * Find interface with current destination address.
1430 * If none on this machine then drop if strictly routed,
1431 * or do nothing if loosely routed.
1432 * Record interface address and bring up next address
1433 * component. If strictly routed make sure next
1434 * address is on directly accessible net.
1435 */
1436 case IPOPT_LSRR:
1437 case IPOPT_SSRR:
984263bc
MD
1438 if (ipstealth && pass > 0)
1439 break;
984263bc
MD
1440 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1441 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1442 goto bad;
1443 }
1444 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1445 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1446 goto bad;
1447 }
1448 ipaddr.sin_addr = ip->ip_dst;
1449 ia = (struct in_ifaddr *)
1450 ifa_ifwithaddr((struct sockaddr *)&ipaddr);
dffa46cd 1451 if (ia == NULL) {
984263bc
MD
1452 if (opt == IPOPT_SSRR) {
1453 type = ICMP_UNREACH;
1454 code = ICMP_UNREACH_SRCFAIL;
1455 goto bad;
1456 }
1457 if (!ip_dosourceroute)
1458 goto nosourcerouting;
1459 /*
1460 * Loose routing, and not at next destination
1461 * yet; nothing to do except forward.
1462 */
1463 break;
1464 }
1465 off--; /* 0 origin */
1466 if (off > optlen - (int)sizeof(struct in_addr)) {
1467 /*
1468 * End of source route. Should be for us.
1469 */
1470 if (!ip_acceptsourceroute)
1471 goto nosourcerouting;
7e31206a 1472 save_rte(m, cp, ip->ip_src);
984263bc
MD
1473 break;
1474 }
984263bc
MD
1475 if (ipstealth)
1476 goto dropit;
984263bc
MD
1477 if (!ip_dosourceroute) {
1478 if (ipforwarding) {
1141eb20
JH
1479 char buf[sizeof "aaa.bbb.ccc.ddd"];
1480
984263bc
MD
1481 /*
1482 * Acting as a router, so generate ICMP
1483 */
1484nosourcerouting:
1485 strcpy(buf, inet_ntoa(ip->ip_dst));
dffa46cd 1486 log(LOG_WARNING,
984263bc
MD
1487 "attempted source route from %s to %s\n",
1488 inet_ntoa(ip->ip_src), buf);
1489 type = ICMP_UNREACH;
1490 code = ICMP_UNREACH_SRCFAIL;
1491 goto bad;
1492 } else {
1493 /*
dffa46cd
JH
1494 * Not acting as a router,
1495 * so silently drop.
984263bc 1496 */
984263bc 1497dropit:
984263bc
MD
1498 ipstat.ips_cantforward++;
1499 m_freem(m);
1500 return (1);
1501 }
1502 }
1503
1504 /*
1505 * locate outgoing interface
1506 */
f23061d4
JH
1507 memcpy(&ipaddr.sin_addr, cp + off,
1508 sizeof ipaddr.sin_addr);
984263bc
MD
1509
1510 if (opt == IPOPT_SSRR) {
1511#define INA struct in_ifaddr *
1512#define SA struct sockaddr *
dffa46cd
JH
1513 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr))
1514 == NULL)
1515 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
d27ef928
SZ
1516 } else {
1517 ia = ip_rtaddr(ipaddr.sin_addr, NULL);
1518 }
dffa46cd 1519 if (ia == NULL) {
984263bc
MD
1520 type = ICMP_UNREACH;
1521 code = ICMP_UNREACH_SRCFAIL;
1522 goto bad;
1523 }
1524 ip->ip_dst = ipaddr.sin_addr;
f23061d4 1525 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1526 sizeof(struct in_addr));
1527 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1528 /*
1529 * Let ip_intr's mcast routing check handle mcast pkts
1530 */
1531 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
1532 break;
1533
1534 case IPOPT_RR:
984263bc
MD
1535 if (ipstealth && pass == 0)
1536 break;
984263bc
MD
1537 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1538 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1539 goto bad;
1540 }
1541 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1542 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1543 goto bad;
1544 }
1545 /*
1546 * If no space remains, ignore.
1547 */
1548 off--; /* 0 origin */
1549 if (off > optlen - (int)sizeof(struct in_addr))
1550 break;
f23061d4
JH
1551 memcpy(&ipaddr.sin_addr, &ip->ip_dst,
1552 sizeof ipaddr.sin_addr);
984263bc
MD
1553 /*
1554 * locate outgoing interface; if we're the destination,
1555 * use the incoming interface (should be same).
1556 */
dffa46cd 1557 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
d27ef928 1558 (ia = ip_rtaddr(ipaddr.sin_addr, NULL)) == NULL) {
984263bc
MD
1559 type = ICMP_UNREACH;
1560 code = ICMP_UNREACH_HOST;
1561 goto bad;
1562 }
f23061d4 1563 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1564 sizeof(struct in_addr));
1565 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1566 break;
1567
1568 case IPOPT_TS:
984263bc
MD
1569 if (ipstealth && pass == 0)
1570 break;
984263bc
MD
1571 code = cp - (u_char *)ip;
1572 if (optlen < 4 || optlen > 40) {
1573 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1574 goto bad;
1575 }
1576 if ((off = cp[IPOPT_OFFSET]) < 5) {
1577 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1578 goto bad;
1579 }
1580 if (off > optlen - (int)sizeof(int32_t)) {
1581 cp[IPOPT_OFFSET + 1] += (1 << 4);
1582 if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
1583 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1584 goto bad;
1585 }
1586 break;
1587 }
1588 off--; /* 0 origin */
1589 sin = (struct in_addr *)(cp + off);
1590 switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
1591
1592 case IPOPT_TS_TSONLY:
1593 break;
1594
1595 case IPOPT_TS_TSANDADDR:
1596 if (off + sizeof(n_time) +
1597 sizeof(struct in_addr) > optlen) {
1598 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1599 goto bad;
1600 }
1601 ipaddr.sin_addr = dst;
1602 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
1603 m->m_pkthdr.rcvif);
dffa46cd 1604 if (ia == NULL)
984263bc 1605 continue;
f23061d4 1606 memcpy(sin, &IA_SIN(ia)->sin_addr,
984263bc
MD
1607 sizeof(struct in_addr));
1608 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1609 off += sizeof(struct in_addr);
1610 break;
1611
1612 case IPOPT_TS_PRESPEC:
1613 if (off + sizeof(n_time) +
1614 sizeof(struct in_addr) > optlen) {
1615 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1616 goto bad;
1617 }
f23061d4 1618 memcpy(&ipaddr.sin_addr, sin,
984263bc 1619 sizeof(struct in_addr));
dffa46cd 1620 if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
984263bc
MD
1621 continue;
1622 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1623 off += sizeof(struct in_addr);
1624 break;
1625
1626 default:
1627 code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
1628 goto bad;
1629 }
1630 ntime = iptime();
f23061d4 1631 memcpy(cp + off, &ntime, sizeof(n_time));
984263bc
MD
1632 cp[IPOPT_OFFSET] += sizeof(n_time);
1633 }
1634 }
1635 if (forward && ipforwarding) {
41332872 1636 ip_forward(m, TRUE, next_hop);
984263bc
MD
1637 return (1);
1638 }
1639 return (0);
1640bad:
981773b8 1641 icmp_error(m, type, code, 0, 0);
984263bc
MD
1642 ipstat.ips_badoptions++;
1643 return (1);
1644}
1645
1646/*
1647 * Given address of next destination (final or next hop),
1648 * return internet address info of interface to be used to get there.
1649 */
1650struct in_ifaddr *
d27ef928 1651ip_rtaddr(struct in_addr dst, struct route *ro0)
984263bc 1652{
d27ef928 1653 struct route sro, *ro;
2256ba69 1654 struct sockaddr_in *sin;
d27ef928
SZ
1655 struct in_ifaddr *ia;
1656
1657 if (ro0 != NULL) {
1658 ro = ro0;
1659 } else {
1660 bzero(&sro, sizeof(sro));
1661 ro = &sro;
1662 }
984263bc 1663
41332872 1664 sin = (struct sockaddr_in *)&ro->ro_dst;
984263bc 1665
41332872
JH
1666 if (ro->ro_rt == NULL || dst.s_addr != sin->sin_addr.s_addr) {
1667 if (ro->ro_rt != NULL) {
1668 RTFREE(ro->ro_rt);
1669 ro->ro_rt = NULL;
984263bc
MD
1670 }
1671 sin->sin_family = AF_INET;
5fe66e68 1672 sin->sin_len = sizeof *sin;
984263bc 1673 sin->sin_addr = dst;
41332872 1674 rtalloc_ign(ro, RTF_PRCLONING);
984263bc 1675 }
dffa46cd 1676
41332872 1677 if (ro->ro_rt == NULL)
dffa46cd
JH
1678 return (NULL);
1679
d27ef928
SZ
1680 ia = ifatoia(ro->ro_rt->rt_ifa);
1681
1682 if (ro == &sro)
1683 RTFREE(ro->ro_rt);
1684 return ia;
984263bc
MD
1685}
1686
1687/*
1688 * Save incoming source route for use in replies,
1689 * to be picked up later by ip_srcroute if the receiver is interested.
1690 */
102cfd56 1691static void
7e31206a 1692save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
984263bc 1693{
7e31206a
SZ
1694 struct m_tag *mtag;
1695 struct ip_srcrt_opt *opt;
984263bc
MD
1696 unsigned olen;
1697
7e31206a
SZ
1698 mtag = m_tag_get(PACKET_TAG_IPSRCRT, sizeof(*opt), MB_DONTWAIT);
1699 if (mtag == NULL)
1700 return;
1701 opt = m_tag_data(mtag);
1702
984263bc
MD
1703 olen = option[IPOPT_OLEN];
1704#ifdef DIAGNOSTIC
1705 if (ipprintfs)
a6ec04bc 1706 kprintf("save_rte: olen %d\n", olen);
984263bc 1707#endif
7e31206a
SZ
1708 if (olen > sizeof(opt->ip_srcrt) - (1 + sizeof(dst))) {
1709 m_tag_free(mtag);
984263bc 1710 return;
7e31206a
SZ
1711 }
1712 bcopy(option, opt->ip_srcrt.srcopt, olen);
1713 opt->ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1714 opt->ip_srcrt.dst = dst;
1715 m_tag_prepend(m, mtag);
984263bc
MD
1716}
1717
1718/*
1719 * Retrieve incoming source route for use in replies,
1720 * in the same form used by setsockopt.
1721 * The first hop is placed before the options, will be removed later.
1722 */
1723struct mbuf *
7e31206a 1724ip_srcroute(struct mbuf *m0)
984263bc 1725{
2256ba69
RG
1726 struct in_addr *p, *q;
1727 struct mbuf *m;
7e31206a
SZ
1728 struct m_tag *mtag;
1729 struct ip_srcrt_opt *opt;
1730
1731 if (m0 == NULL)
1732 return NULL;
984263bc 1733
7e31206a
SZ
1734 mtag = m_tag_find(m0, PACKET_TAG_IPSRCRT, NULL);
1735 if (mtag == NULL)
1736 return NULL;
1737 opt = m_tag_data(mtag);
1738
1739 if (opt->ip_nhops == 0)
dffa46cd 1740 return (NULL);
74f1caca 1741 m = m_get(MB_DONTWAIT, MT_HEADER);
dffa46cd
JH
1742 if (m == NULL)
1743 return (NULL);
984263bc 1744
7e31206a 1745#define OPTSIZ (sizeof(opt->ip_srcrt.nop) + sizeof(opt->ip_srcrt.srcopt))
984263bc
MD
1746
1747 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
7e31206a
SZ
1748 m->m_len = opt->ip_nhops * sizeof(struct in_addr) +
1749 sizeof(struct in_addr) + OPTSIZ;
984263bc 1750#ifdef DIAGNOSTIC
7e31206a
SZ
1751 if (ipprintfs) {
1752 kprintf("ip_srcroute: nhops %d mlen %d",
1753 opt->ip_nhops, m->m_len);
1754 }
984263bc
MD
1755#endif
1756
1757 /*
1758 * First save first hop for return route
1759 */
7e31206a 1760 p = &opt->ip_srcrt.route[opt->ip_nhops - 1];
984263bc
MD
1761 *(mtod(m, struct in_addr *)) = *p--;
1762#ifdef DIAGNOSTIC
1763 if (ipprintfs)
a6ec04bc 1764 kprintf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
984263bc
MD
1765#endif
1766
1767 /*
1768 * Copy option fields and padding (nop) to mbuf.
1769 */
7e31206a
SZ
1770 opt->ip_srcrt.nop = IPOPT_NOP;
1771 opt->ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1772 memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &opt->ip_srcrt.nop,
dffa46cd 1773 OPTSIZ);
984263bc
MD
1774 q = (struct in_addr *)(mtod(m, caddr_t) +
1775 sizeof(struct in_addr) + OPTSIZ);
1776#undef OPTSIZ
1777 /*
1778 * Record return path as an IP source route,
1779 * reversing the path (pointers are now aligned).
1780 */
7e31206a 1781 while (p >= opt->ip_srcrt.route) {
984263bc
MD
1782#ifdef DIAGNOSTIC
1783 if (ipprintfs)
a6ec04bc 1784 kprintf(" %x", ntohl(q->s_addr));
984263bc
MD
1785#endif
1786 *q++ = *p--;
1787 }
1788 /*
1789 * Last hop goes to final destination.
1790 */
7e31206a
SZ
1791 *q = opt->ip_srcrt.dst;
1792 m_tag_delete(m0, mtag);
984263bc
MD
1793#ifdef DIAGNOSTIC
1794 if (ipprintfs)
a6ec04bc 1795 kprintf(" %x\n", ntohl(q->s_addr));
984263bc
MD
1796#endif
1797 return (m);
1798}
1799
1800/*
bddf0751 1801 * Strip out IP options.
984263bc
MD
1802 */
1803void
bddf0751 1804ip_stripoptions(struct mbuf *m)
984263bc 1805{
bddf0751 1806 int datalen;
984263bc 1807 struct ip *ip = mtod(m, struct ip *);
2256ba69 1808 caddr_t opts;
bddf0751 1809 int optlen;
984263bc 1810
bddf0751 1811 optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc 1812 opts = (caddr_t)(ip + 1);
bddf0751
JH
1813 datalen = m->m_len - (sizeof(struct ip) + optlen);
1814 bcopy(opts + optlen, opts, datalen);
1815 m->m_len -= optlen;
984263bc 1816 if (m->m_flags & M_PKTHDR)
bddf0751 1817 m->m_pkthdr.len -= optlen;
984263bc
MD
1818 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
1819}
1820
1821u_char inetctlerrmap[PRC_NCMDS] = {
1822 0, 0, 0, 0,
1823 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1824 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1825 EMSGSIZE, EHOSTUNREACH, 0, 0,
1826 0, 0, 0, 0,
1827 ENOPROTOOPT, ECONNREFUSED
1828};
1829
1830/*
1831 * Forward a packet. If some error occurs return the sender
1832 * an icmp packet. Note we can't always generate a meaningful
1833 * icmp message because icmp doesn't have a large enough repertoire
1834 * of codes and types.
1835 *
1836 * If not forwarding, just drop the packet. This could be confusing
1837 * if ipforwarding was zero but some routing protocol was advancing
1838 * us as a gateway to somewhere. However, we must let the routing
1839 * protocol deal with that.
1840 *
dffa46cd 1841 * The using_srcrt parameter indicates whether the packet is being forwarded
984263bc
MD
1842 * via a source route.
1843 */
33cc7bb1 1844void
41332872 1845ip_forward(struct mbuf *m, boolean_t using_srcrt, struct sockaddr_in *next_hop)
984263bc
MD
1846{
1847 struct ip *ip = mtod(m, struct ip *);
984263bc 1848 struct rtentry *rt;
6164b468 1849 struct route fwd_ro;
981773b8 1850 int error, type = 0, code = 0, destmtu = 0;
984263bc
MD
1851 struct mbuf *mcopy;
1852 n_long dest;
1853 struct in_addr pkt_dst;
984263bc 1854
be23faf1 1855 dest = INADDR_ANY;
984263bc
MD
1856 /*
1857 * Cache the destination address of the packet; this may be
1858 * changed by use of 'ipfw fwd'.
1859 */
5fe66e68 1860 pkt_dst = (next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
1861
1862#ifdef DIAGNOSTIC
1863 if (ipprintfs)
a6ec04bc 1864 kprintf("forward: src %x dst %x ttl %x\n",
dffa46cd 1865 ip->ip_src.s_addr, pkt_dst.s_addr, ip->ip_ttl);
984263bc
MD
1866#endif
1867
dffa46cd 1868 if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) {
984263bc
MD
1869 ipstat.ips_cantforward++;
1870 m_freem(m);
1871 return;
1872 }
dffa46cd 1873 if (!ipstealth && ip->ip_ttl <= IPTTLDEC) {
981773b8 1874 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
dffa46cd 1875 return;
984263bc 1876 }
984263bc 1877
6164b468
MD
1878 bzero(&fwd_ro, sizeof(fwd_ro));
1879 ip_rtaddr(pkt_dst, &fwd_ro);
1880 if (fwd_ro.ro_rt == NULL) {
984322d1
SZ
1881 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1882 return;
984263bc 1883 }
6164b468 1884 rt = fwd_ro.ro_rt;
984263bc
MD
1885
1886 /*
1887 * Save the IP header and at most 8 bytes of the payload,
1888 * in case we need to generate an ICMP message to the src.
1889 *
1890 * XXX this can be optimized a lot by saving the data in a local
1891 * buffer on the stack (72 bytes at most), and only allocating the
1892 * mbuf if really necessary. The vast majority of the packets
1893 * are forwarded without having to send an ICMP back (either
1894 * because unnecessary, or because rate limited), so we are
1895 * really we are wasting a lot of work here.
1896 *
1897 * We don't use m_copy() because it might return a reference
1898 * to a shared cluster. Both this function and ip_output()
1899 * assume exclusive access to the IP header in `m', so any
1900 * data in a cluster may change before we reach icmp_error().
1901 */
85c8d4e6 1902 MGETHDR(mcopy, MB_DONTWAIT, m->m_type);
74f1caca 1903 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, MB_DONTWAIT)) {
984263bc
MD
1904 /*
1905 * It's probably ok if the pkthdr dup fails (because
1906 * the deep copy of the tag chain failed), but for now
1907 * be conservative and just discard the copy since
1908 * code below may some day want the tags.
1909 */
1910 m_free(mcopy);
1911 mcopy = NULL;
1912 }
1913 if (mcopy != NULL) {
1914 mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
1915 (int)ip->ip_len);
52560a13 1916 mcopy->m_pkthdr.len = mcopy->m_len;
984263bc
MD
1917 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1918 }
1919
dffa46cd 1920 if (!ipstealth)
984263bc 1921 ip->ip_ttl -= IPTTLDEC;
984263bc
MD
1922
1923 /*
1924 * If forwarding packet using same interface that it came in on,
1925 * perhaps should send a redirect to sender to shortcut a hop.
1926 * Only send redirect if source is sending directly to us,
1927 * and if packet was not source routed (or has any options).
1928 * Also, don't send redirect if forwarding using a default route
1929 * or a route modified by a redirect.
1930 */
1931 if (rt->rt_ifp == m->m_pkthdr.rcvif &&
dffa46cd
JH
1932 !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) &&
1933 satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY &&
983015c8 1934 ipsendredirects && !using_srcrt && next_hop == NULL) {
984263bc 1935 u_long src = ntohl(ip->ip_src.s_addr);
41332872 1936 struct in_ifaddr *rt_ifa = (struct in_ifaddr *)rt->rt_ifa;
984263bc 1937
41332872
JH
1938 if (rt_ifa != NULL &&
1939 (src & rt_ifa->ia_subnetmask) == rt_ifa->ia_subnet) {
dffa46cd
JH
1940 if (rt->rt_flags & RTF_GATEWAY)
1941 dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1942 else
1943 dest = pkt_dst.s_addr;
1944 /*
1945 * Router requirements says to only send
1946 * host redirects.
1947 */
1948 type = ICMP_REDIRECT;
1949 code = ICMP_REDIRECT_HOST;
984263bc 1950#ifdef DIAGNOSTIC
dffa46cd 1951 if (ipprintfs)
a6ec04bc 1952 kprintf("redirect (%d) to %x\n", code, dest);
984263bc
MD
1953#endif
1954 }
1955 }
1956
6164b468 1957 error = ip_output(m, NULL, &fwd_ro, IP_FORWARDING, NULL, NULL);
41332872 1958 if (error == 0) {
984263bc 1959 ipstat.ips_forward++;
41332872 1960 if (type == 0) {
984263bc 1961 if (mcopy) {
6164b468 1962 ipflow_create(&fwd_ro, mcopy);
297c8124 1963 m_freem(mcopy);
984263bc 1964 }
984322d1 1965 goto done;
41332872
JH
1966 } else {
1967 ipstat.ips_redirectsent++;
984263bc 1968 }
41332872
JH
1969 } else {
1970 ipstat.ips_cantforward++;
984263bc 1971 }
41332872 1972
984263bc 1973 if (mcopy == NULL)
984322d1 1974 goto done;
41332872
JH
1975
1976 /*
1977 * Send ICMP message.
1978 */
984263bc
MD
1979
1980 switch (error) {
1981
1982 case 0: /* forwarded, but need redirect */
1983 /* type, code set above */
1984 break;
1985
1986 case ENETUNREACH: /* shouldn't happen, checked above */
1987 case EHOSTUNREACH:
1988 case ENETDOWN:
1989 case EHOSTDOWN:
1990 default:
1991 type = ICMP_UNREACH;
1992 code = ICMP_UNREACH_HOST;
1993 break;
1994
1995 case EMSGSIZE:
1996 type = ICMP_UNREACH;
1997 code = ICMP_UNREACH_NEEDFRAG;
1998#ifdef IPSEC
1999 /*
2000 * If the packet is routed over IPsec tunnel, tell the
2001 * originator the tunnel MTU.
2002 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2003 * XXX quickhack!!!
2004 */
6164b468 2005 if (fwd_ro.ro_rt != NULL) {
984263bc
MD
2006 struct secpolicy *sp = NULL;
2007 int ipsecerror;
2008 int ipsechdr;
2009 struct route *ro;
2010
2011 sp = ipsec4_getpolicybyaddr(mcopy,
2012 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2013 IP_FORWARDING,
2014 &ipsecerror);
984263bc
MD
2015
2016 if (sp == NULL)
6164b468 2017 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2018 else {
2019 /* count IPsec header size */
2020 ipsechdr = ipsec4_hdrsiz(mcopy,
2021 IPSEC_DIR_OUTBOUND,
2022 NULL);
2023
2024 /*
2025 * find the correct route for outer IPv4
2026 * header, compute tunnel MTU.
2027 *
984263bc 2028 */
012d77ea
JH
2029 if (sp->req != NULL && sp->req->sav != NULL &&
2030 sp->req->sav->sah != NULL) {
984263bc 2031 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2032 if (ro->ro_rt != NULL &&
2033 ro->ro_rt->rt_ifp != NULL) {
981773b8 2034 destmtu =
984263bc 2035 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2036 destmtu -= ipsechdr;
984263bc
MD
2037 }
2038 }
2039
2040 key_freesp(sp);
2041 }
2042 }
2043#elif FAST_IPSEC
2044 /*
2045 * If the packet is routed over IPsec tunnel, tell the
2046 * originator the tunnel MTU.
2047 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2048 * XXX quickhack!!!
2049 */
6164b468 2050 if (fwd_ro.ro_rt != NULL) {
984263bc
MD
2051 struct secpolicy *sp = NULL;
2052 int ipsecerror;
2053 int ipsechdr;
2054 struct route *ro;
2055
2056 sp = ipsec_getpolicybyaddr(mcopy,
2057 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2058 IP_FORWARDING,
2059 &ipsecerror);
984263bc
MD
2060
2061 if (sp == NULL)
6164b468 2062 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2063 else {
2064 /* count IPsec header size */
2065 ipsechdr = ipsec4_hdrsiz(mcopy,
2066 IPSEC_DIR_OUTBOUND,
2067 NULL);
2068
2069 /*
2070 * find the correct route for outer IPv4
2071 * header, compute tunnel MTU.
984263bc 2072 */
981773b8 2073
012d77ea
JH
2074 if (sp->req != NULL &&
2075 sp->req->sav != NULL &&
2076 sp->req->sav->sah != NULL) {
984263bc 2077 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2078 if (ro->ro_rt != NULL &&
2079 ro->ro_rt->rt_ifp != NULL) {
981773b8 2080 destmtu =
984263bc 2081 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2082 destmtu -= ipsechdr;
984263bc
MD
2083 }
2084 }
2085
2086 KEY_FREESP(&sp);
2087 }
2088 }
2089#else /* !IPSEC && !FAST_IPSEC */
6164b468
MD
2090 if (fwd_ro.ro_rt != NULL)
2091 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2092#endif /*IPSEC*/
2093 ipstat.ips_cantfrag++;
2094 break;
2095
2096 case ENOBUFS:
2097 /*
2098 * A router should not generate ICMP_SOURCEQUENCH as
2099 * required in RFC1812 Requirements for IP Version 4 Routers.
2100 * Source quench could be a big problem under DoS attacks,
2101 * or if the underlying interface is rate-limited.
2102 * Those who need source quench packets may re-enable them
2103 * via the net.inet.ip.sendsourcequench sysctl.
2104 */
dffa46cd 2105 if (!ip_sendsourcequench) {
984263bc 2106 m_freem(mcopy);
984322d1 2107 goto done;
984263bc
MD
2108 } else {
2109 type = ICMP_SOURCEQUENCH;
2110 code = 0;
2111 }
2112 break;
2113
2114 case EACCES: /* ipfw denied packet */
2115 m_freem(mcopy);
984322d1 2116 goto done;
984263bc 2117 }
981773b8 2118 icmp_error(mcopy, type, code, dest, destmtu);
984322d1 2119done:
6164b468
MD
2120 if (fwd_ro.ro_rt != NULL)
2121 RTFREE(fwd_ro.ro_rt);
984263bc
MD
2122}
2123
2124void
dffa46cd
JH
2125ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2126 struct mbuf *m)
984263bc
MD
2127{
2128 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2129 struct timeval tv;
2130
2131 microtime(&tv);
2132 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
dffa46cd 2133 SCM_TIMESTAMP, SOL_SOCKET);
984263bc
MD
2134 if (*mp)
2135 mp = &(*mp)->m_next;
2136 }
2137 if (inp->inp_flags & INP_RECVDSTADDR) {
2138 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2139 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2140 if (*mp)
2141 mp = &(*mp)->m_next;
2142 }
95926362
MD
2143 if (inp->inp_flags & INP_RECVTTL) {
2144 *mp = sbcreatecontrol((caddr_t) &ip->ip_ttl,
2145 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
2146 if (*mp)
2147 mp = &(*mp)->m_next;
2148 }
984263bc
MD
2149#ifdef notyet
2150 /* XXX
2151 * Moving these out of udp_input() made them even more broken
2152 * than they already were.
2153 */
2154 /* options were tossed already */
2155 if (inp->inp_flags & INP_RECVOPTS) {
2156 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2157 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2158 if (*mp)
2159 mp = &(*mp)->m_next;
2160 }
2161 /* ip_srcroute doesn't do what we want here, need to fix */
2162 if (inp->inp_flags & INP_RECVRETOPTS) {
7e31206a 2163 *mp = sbcreatecontrol((caddr_t) ip_srcroute(m),
984263bc
MD
2164 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2165 if (*mp)
2166 mp = &(*mp)->m_next;
2167 }
2168#endif
2169 if (inp->inp_flags & INP_RECVIF) {
2170 struct ifnet *ifp;
2171 struct sdlbuf {
2172 struct sockaddr_dl sdl;
2173 u_char pad[32];
2174 } sdlbuf;
2175 struct sockaddr_dl *sdp;
2176 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
2177
dffa46cd
JH
2178 if (((ifp = m->m_pkthdr.rcvif)) &&
2179 ((ifp->if_index != 0) && (ifp->if_index <= if_index))) {
f2682cb9 2180 sdp = IF_LLSOCKADDR(ifp);
984263bc
MD
2181 /*
2182 * Change our mind and don't try copy.
2183 */
dffa46cd
JH
2184 if ((sdp->sdl_family != AF_LINK) ||
2185 (sdp->sdl_len > sizeof(sdlbuf))) {
984263bc
MD
2186 goto makedummy;
2187 }
2188 bcopy(sdp, sdl2, sdp->sdl_len);
2189 } else {
dffa46cd
JH
2190makedummy:
2191 sdl2->sdl_len =
2192 offsetof(struct sockaddr_dl, sdl_data[0]);
984263bc
MD
2193 sdl2->sdl_family = AF_LINK;
2194 sdl2->sdl_index = 0;
2195 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
2196 }
2197 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
2198 IP_RECVIF, IPPROTO_IP);
2199 if (*mp)
2200 mp = &(*mp)->m_next;
2201 }
2202}
2203
2204/*
2205 * XXX these routines are called from the upper part of the kernel.
2206 *
2207 * They could also be moved to ip_mroute.c, since all the RSVP
2208 * handling is done there already.
2209 */
2210int
2211ip_rsvp_init(struct socket *so)
2212{
2213 if (so->so_type != SOCK_RAW ||
2214 so->so_proto->pr_protocol != IPPROTO_RSVP)
2215 return EOPNOTSUPP;
2216
2217 if (ip_rsvpd != NULL)
2218 return EADDRINUSE;
2219
2220 ip_rsvpd = so;
2221 /*
2222 * This may seem silly, but we need to be sure we don't over-increment
2223 * the RSVP counter, in case something slips up.
2224 */
2225 if (!ip_rsvp_on) {
2226 ip_rsvp_on = 1;
2227 rsvp_on++;
2228 }
2229
2230 return 0;
2231}
2232
2233int
2234ip_rsvp_done(void)
2235{
2236 ip_rsvpd = NULL;
2237 /*
2238 * This may seem silly, but we need to be sure we don't over-decrement
2239 * the RSVP counter, in case something slips up.
2240 */
2241 if (ip_rsvp_on) {
2242 ip_rsvp_on = 0;
2243 rsvp_on--;
2244 }
2245 return 0;
2246}
2247
002c1265
MD
2248int
2249rsvp_input(struct mbuf **mp, int *offp, int proto)
984263bc 2250{
002c1265
MD
2251 struct mbuf *m = *mp;
2252 int off;
a00138cb 2253
002c1265
MD
2254 off = *offp;
2255 *mp = NULL;
a00138cb 2256
984263bc 2257 if (rsvp_input_p) { /* call the real one if loaded */
002c1265
MD
2258 *mp = m;
2259 rsvp_input_p(mp, offp, proto);
2260 return(IPPROTO_DONE);
984263bc
MD
2261 }
2262
2263 /* Can still get packets with rsvp_on = 0 if there is a local member
2264 * of the group to which the RSVP packet is addressed. But in this
2265 * case we want to throw the packet away.
2266 */
2267
2268 if (!rsvp_on) {
2269 m_freem(m);
002c1265 2270 return(IPPROTO_DONE);
984263bc
MD
2271 }
2272
dffa46cd 2273 if (ip_rsvpd != NULL) {
002c1265
MD
2274 *mp = m;
2275 rip_input(mp, offp, proto);
2276 return(IPPROTO_DONE);
984263bc
MD
2277 }
2278 /* Drop the packet */
2279 m_freem(m);
002c1265 2280 return(IPPROTO_DONE);
984263bc 2281}