netisr: Add hashcheck method to check and adjust hw provided hash
[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"
73#include "opt_ipfw.h"
74#include "opt_ipdn.h"
75#include "opt_ipdivert.h"
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76#include "opt_ipstealth.h"
77#include "opt_ipsec.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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JH
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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JH
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 int ip_dispatch_fast = 0;
205static int ip_dispatch_slow = 0;
206static int ip_dispatch_recheck = 0;
207static int ip_dispatch_software = 0;
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208SYSCTL_INT(_net_inet_ip, OID_AUTO, dispatch_fast_count, CTLFLAG_RD,
209 &ip_dispatch_fast, 0,
210 "Number of IP dispatches handled on current CPU");
211SYSCTL_INT(_net_inet_ip, OID_AUTO, dispatch_slow_count, CTLFLAG_RD,
212 &ip_dispatch_slow, 0,
213 "Number of IP dispatches messaged to another CPU");
214SYSCTL_INT(_net_inet_ip, OID_AUTO, dispatch_software_count, CTLFLAG_RD,
215 &ip_dispatch_software, 0, "");
216SYSCTL_INT(_net_inet_ip, OID_AUTO, dispatch_recheck_count, CTLFLAG_RD,
217 &ip_dispatch_recheck, 0, "");
c3c96e44 218
a3c18566 219static struct lwkt_token ipq_token = LWKT_TOKEN_INITIALIZER(ipq_token);
2d23a8be 220
984263bc 221#ifdef DIAGNOSTIC
dffa46cd 222static int ipprintfs = 0;
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223#endif
224
984263bc 225extern struct domain inetdomain;
4468b0b4 226extern struct protosw inetsw[];
984263bc 227u_char ip_protox[IPPROTO_MAX];
1b562c24 228struct in_ifaddrhead in_ifaddrheads[MAXCPU]; /* first inet address */
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229struct in_ifaddrhashhead *in_ifaddrhashtbls[MAXCPU];
230 /* inet addr hash table */
984263bc 231u_long in_ifaddrhmask; /* mask for hash table */
dffa46cd 232
ae1d3076 233struct ip_stats ipstats_percpu[MAXCPU];
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234#ifdef SMP
235static int
236sysctl_ipstats(SYSCTL_HANDLER_ARGS)
237{
238 int cpu, error = 0;
239
240 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 241 if ((error = SYSCTL_OUT(req, &ipstats_percpu[cpu],
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242 sizeof(struct ip_stats))))
243 break;
ae1d3076 244 if ((error = SYSCTL_IN(req, &ipstats_percpu[cpu],
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245 sizeof(struct ip_stats))))
246 break;
247 }
248
249 return (error);
250}
251SYSCTL_PROC(_net_inet_ip, IPCTL_STATS, stats, (CTLTYPE_OPAQUE | CTLFLAG_RW),
252 0, 0, sysctl_ipstats, "S,ip_stats", "IP statistics");
253#else
984263bc 254SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
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255 &ipstat, ip_stats, "IP statistics");
256#endif
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257
258/* Packet reassembly stuff */
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259#define IPREASS_NHASH_LOG2 6
260#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
261#define IPREASS_HMASK (IPREASS_NHASH - 1)
262#define IPREASS_HASH(x,y) \
263 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
984263bc 264
83c38804 265static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH];
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266
267#ifdef IPCTL_DEFMTU
268SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
269 &ip_mtu, 0, "Default MTU");
270#endif
271
272#ifdef IPSTEALTH
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273static int ipstealth = 0;
274SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW, &ipstealth, 0, "");
275#else
276static const int ipstealth = 0;
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277#endif
278
0030d31a
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279struct mbuf *(*ip_divert_p)(struct mbuf *, int, int);
280
e7e55f42 281struct pfil_head inet_pfil_hook;
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282
283/*
7e31206a
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284 * struct ip_srcrt_opt is used to store packet state while it travels
285 * through the stack.
286 *
287 * XXX Note that the code even makes assumptions on the size and
984263bc 288 * alignment of fields inside struct ip_srcrt so e.g. adding some
7e31206a 289 * fields will break the code. This needs to be fixed.
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290 *
291 * We need to save the IP options in case a protocol wants to respond
292 * to an incoming packet over the same route if the packet got here
293 * using IP source routing. This allows connection establishment and
294 * maintenance when the remote end is on a network that is not known
295 * to us.
296 */
7e31206a 297struct ip_srcrt {
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298 struct in_addr dst; /* final destination */
299 char nop; /* one NOP to align */
300 char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */
301 struct in_addr route[MAX_IPOPTLEN/sizeof(struct in_addr)];
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302};
303
304struct ip_srcrt_opt {
305 int ip_nhops;
306 struct ip_srcrt ip_srcrt;
307};
984263bc 308
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309static MALLOC_DEFINE(M_IPQ, "ipq", "IP Fragment Management");
310static struct malloc_pipe ipq_mpipe;
311
7e31206a 312static void save_rte(struct mbuf *, u_char *, struct in_addr);
bb3b17df 313static int ip_dooptions(struct mbuf *m, int, struct sockaddr_in *);
83c38804 314static void ip_freef(struct ipqhead *, struct ipq *);
002c1265 315static void ip_input_handler(netmsg_t);
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316
317/*
318 * IP initialization: fill in IP protocol switch table.
319 * All protocols not implemented in kernel go to raw IP protocol handler.
320 */
321void
8a3125c6 322ip_init(void)
984263bc 323{
4468b0b4 324 struct protosw *pr;
2256ba69 325 int i;
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326#ifdef SMP
327 int cpu;
328#endif
984263bc 329
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330 /*
331 * Make sure we can handle a reasonable number of fragments but
332 * cap it at 4000 (XXX).
333 */
334 mpipe_init(&ipq_mpipe, M_IPQ, sizeof(struct ipq),
fdec03d6 335 IFQ_MAXLEN, 4000, 0, NULL, NULL, NULL);
f8983475 336 for (i = 0; i < ncpus; ++i) {
1b562c24 337 TAILQ_INIT(&in_ifaddrheads[i]);
f8983475
SZ
338 in_ifaddrhashtbls[i] =
339 hashinit(INADDR_NHASH, M_IFADDR, &in_ifaddrhmask);
340 }
4468b0b4 341 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
dffa46cd 342 if (pr == NULL)
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343 panic("ip_init");
344 for (i = 0; i < IPPROTO_MAX; i++)
345 ip_protox[i] = pr - inetsw;
4468b0b4 346 for (pr = inetdomain.dom_protosw;
92db3805
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347 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
348 if (pr->pr_domain->dom_family == PF_INET && pr->pr_protocol) {
349 if (pr->pr_protocol != IPPROTO_RAW)
350 ip_protox[pr->pr_protocol] = pr - inetsw;
92db3805
SZ
351 }
352 }
984263bc 353
e7e55f42
JR
354 inet_pfil_hook.ph_type = PFIL_TYPE_AF;
355 inet_pfil_hook.ph_af = AF_INET;
5e3f3b7a 356 if ((i = pfil_head_register(&inet_pfil_hook)) != 0) {
a6ec04bc 357 kprintf("%s: WARNING: unable to register pfil hook, "
e7e55f42 358 "error %d\n", __func__, i);
5e3f3b7a 359 }
e7e55f42 360
984263bc 361 for (i = 0; i < IPREASS_NHASH; i++)
83c38804 362 TAILQ_INIT(&ipq[i]);
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MD
363
364 maxnipq = nmbclusters / 32;
365 maxfragsperpacket = 16;
366
984263bc 367 ip_id = time_second & 0xffff;
984263bc 368
fc9c7b4f 369 /*
ae1d3076 370 * Initialize IP statistics counters for each CPU.
fc9c7b4f 371 *
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372 */
373#ifdef SMP
374 for (cpu = 0; cpu < ncpus; ++cpu) {
ae1d3076 375 bzero(&ipstats_percpu[cpu], sizeof(struct ip_stats));
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HP
376 }
377#else
378 bzero(&ipstat, sizeof(struct ip_stats));
379#endif
380
c3c96e44 381 netisr_register(NETISR_IP, ip_input_handler, ip_cpufn_in);
e6f77b88 382 netisr_register_hashcheck(NETISR_IP, ip_hashcheck);
984263bc
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383}
384
0c7ac0cd
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385/* Do transport protocol processing. */
386static void
5de23090 387transport_processing_oncpu(struct mbuf *m, int hlen, struct ip *ip)
0c7ac0cd 388{
92db3805
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389 const struct protosw *pr = &inetsw[ip_protox[ip->ip_p]];
390
0c7ac0cd
JH
391 /*
392 * Switch out to protocol's input routine.
393 */
92db3805 394 PR_GET_MPLOCK(pr);
002c1265 395 pr->pr_input(&m, &hlen, ip->ip_p);
92db3805 396 PR_REL_MPLOCK(pr);
0c7ac0cd
JH
397}
398
4599cf19 399static void
002c1265 400transport_processing_handler(netmsg_t msg)
0c7ac0cd 401{
002c1265 402 struct netmsg_packet *pmsg = &msg->packet;
0c7ac0cd 403 struct ip *ip;
3d6057fe
SZ
404 int hlen;
405
406 ip = mtod(pmsg->nm_packet, struct ip *);
002c1265 407 hlen = pmsg->base.lmsg.u.ms_result;
0c7ac0cd 408
3d6057fe 409 transport_processing_oncpu(pmsg->nm_packet, hlen, ip);
002c1265 410 /* msg was embedded in the mbuf, do not reply! */
0c7ac0cd
JH
411}
412
4599cf19 413static void
002c1265 414ip_input_handler(netmsg_t msg)
4f277347 415{
002c1265
MD
416 ip_input(msg->packet.nm_packet);
417 /* msg was embedded in the mbuf, do not reply! */
4f277347
JH
418}
419
984263bc 420/*
590b8cd4 421 * IP input routine. Checksum and byte swap header. If fragmented
984263bc
MD
422 * try to reassemble. Process options. Pass to next level.
423 */
424void
4f277347 425ip_input(struct mbuf *m)
984263bc
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426{
427 struct ip *ip;
984263bc 428 struct in_ifaddr *ia = NULL;
f8983475 429 struct in_ifaddr_container *iac;
8c6081b9 430 int hlen, checkif;
984263bc
MD
431 u_short sum;
432 struct in_addr pkt_dst;
dffa46cd 433 boolean_t using_srcrt = FALSE; /* forward (by PFIL_HOOKS) */
e7e55f42 434 struct in_addr odst; /* original dst address(NAT) */
984263bc 435 struct m_tag *mtag;
5de23090 436 struct sockaddr_in *next_hop = NULL;
6a704092 437 lwkt_port_t port;
e5ecc832 438#ifdef FAST_IPSEC
984263bc
MD
439 struct tdb_ident *tdbi;
440 struct secpolicy *sp;
1cae611f 441 int error;
dffa46cd 442#endif
984263bc 443
814907cb 444 M_ASSERTPKTHDR(m);
984263bc 445
6a704092 446 /*
c3c96e44
MD
447 * This routine is called from numerous places which may not have
448 * characterized the packet.
6a704092 449 */
c3c96e44
MD
450 if ((m->m_flags & M_HASH) == 0) {
451 ++ip_dispatch_software;
452 ip_cpufn(&m, 0, IP_MPORT_IN);
453 if (m == NULL)
454 return;
455 KKASSERT(m->m_flags & M_HASH);
456 }
6a704092
MD
457 ip = mtod(m, struct ip *);
458
459 /*
460 * Pull out certain tags
461 */
5de23090
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462 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
463 /* Next hop */
464 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
465 KKASSERT(mtag != NULL);
466 next_hop = m_tag_data(mtag);
467 }
468
eb241549 469 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
eb241549 470 /* dummynet already filtered us */
984263bc
MD
471 ip = mtod(m, struct ip *);
472 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
dffa46cd 473 goto iphack;
984263bc
MD
474 }
475
476 ipstat.ips_total++;
477
c3c96e44 478 /* length checks already done in ip_cpufn() */
47d96de7 479 KASSERT(m->m_len >= sizeof(struct ip), ("IP header not in one mbuf"));
984263bc
MD
480
481 if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
482 ipstat.ips_badvers++;
483 goto bad;
484 }
485
486 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
c3c96e44 487 /* length checks already done in ip_cpufn() */
9babcab8 488 KASSERT(hlen >= sizeof(struct ip), ("IP header len too small"));
9b161cc2 489 KASSERT(m->m_len >= hlen, ("complete IP header not in one mbuf"));
984263bc
MD
490
491 /* 127/8 must not appear on wire - RFC1122 */
492 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
493 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
dffa46cd 494 if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) {
984263bc
MD
495 ipstat.ips_badaddr++;
496 goto bad;
497 }
498 }
499
500 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
501 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
502 } else {
459837b1 503 if (hlen == sizeof(struct ip))
984263bc 504 sum = in_cksum_hdr(ip);
459837b1 505 else
984263bc 506 sum = in_cksum(m, hlen);
984263bc 507 }
5fe66e68 508 if (sum != 0) {
984263bc
MD
509 ipstat.ips_badsum++;
510 goto bad;
511 }
512
4d723e5a
JS
513#ifdef ALTQ
514 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0) {
515 /* packet is dropped by traffic conditioner */
516 return;
517 }
518#endif
984263bc
MD
519 /*
520 * Convert fields to host representation.
521 */
522 ip->ip_len = ntohs(ip->ip_len);
984263bc
MD
523 ip->ip_off = ntohs(ip->ip_off);
524
c3c96e44 525 /* length checks already done in ip_cpufn() */
9b161cc2
SZ
526 KASSERT(ip->ip_len >= hlen, ("total length less then header length"));
527 KASSERT(m->m_pkthdr.len >= ip->ip_len, ("mbuf too short"));
528
984263bc 529 /*
9b161cc2 530 * Trim mbufs if longer than the IP header would have us expect.
984263bc 531 */
984263bc
MD
532 if (m->m_pkthdr.len > ip->ip_len) {
533 if (m->m_len == m->m_pkthdr.len) {
534 m->m_len = ip->ip_len;
535 m->m_pkthdr.len = ip->ip_len;
459837b1 536 } else {
984263bc 537 m_adj(m, ip->ip_len - m->m_pkthdr.len);
459837b1 538 }
984263bc
MD
539 }
540#if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
541 /*
542 * Bypass packet filtering for packets from a tunnel (gif).
543 */
544 if (ipsec_gethist(m, NULL))
545 goto pass;
546#endif
547
548 /*
549 * IpHack's section.
550 * Right now when no processing on packet has done
551 * and it is still fresh out of network we do our black
552 * deals with it.
553 * - Firewall: deny/allow/divert
554 * - Xlate: translate packet's addr/port (NAT).
555 * - Pipe: pass pkt through dummynet.
556 * - Wrap: fake packet's addr/port <unimpl.>
557 * - Encapsulate: put it in another IP and send out. <unimp.>
dffa46cd 558 */
984263bc
MD
559
560iphack:
a5d1fda3
SZ
561 /*
562 * If we've been forwarded from the output side, then
563 * skip the firewall a second time
564 */
565 if (next_hop != NULL)
566 goto ours;
dffa46cd 567
a93c9c2f
SZ
568 /* No pfil hooks */
569 if (!pfil_has_hooks(&inet_pfil_hook)) {
570 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
571 /*
572 * Strip dummynet tags from stranded packets
573 */
574 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
575 KKASSERT(mtag != NULL);
576 m_tag_delete(m, mtag);
577 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
578 }
579 goto pass;
580 }
581
984263bc 582 /*
e7e55f42
JR
583 * Run through list of hooks for input packets.
584 *
c3c96e44
MD
585 * NOTE! If the packet is rewritten pf/ipfw/whoever must
586 * clear M_HASH.
984263bc 587 */
a93c9c2f
SZ
588 odst = ip->ip_dst;
589 if (pfil_run_hooks(&inet_pfil_hook, &m, m->m_pkthdr.rcvif, PFIL_IN))
590 return;
591 if (m == NULL) /* consumed by filter */
592 return;
593 ip = mtod(m, struct ip *);
594 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
595 using_srcrt = (odst.s_addr != ip->ip_dst.s_addr);
dffa46cd 596
a5d1fda3
SZ
597 if (m->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
598 mtag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL);
599 KKASSERT(mtag != NULL);
600 next_hop = m_tag_data(mtag);
601 }
e4d4f9c3
SZ
602 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
603 ip_dn_queue(m);
604 return;
605 }
012d335d 606 if (m->m_pkthdr.fw_flags & FW_MBUF_REDISPATCH) {
012d335d
SZ
607 m->m_pkthdr.fw_flags &= ~FW_MBUF_REDISPATCH;
608 }
8c6081b9 609pass:
984263bc
MD
610 /*
611 * Process options and, if not destined for us,
612 * ship it on. ip_dooptions returns 1 when an
613 * error was detected (causing an icmp message
614 * to be sent and the original packet to be freed).
615 */
5de23090 616 if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, next_hop))
984263bc
MD
617 return;
618
dffa46cd
JH
619 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
620 * matter if it is destined to another node, or whether it is
621 * a multicast one, RSVP wants it! and prevents it from being forwarded
622 * anywhere else. Also checks if the rsvp daemon is running before
984263bc 623 * grabbing the packet.
dffa46cd
JH
624 */
625 if (rsvp_on && ip->ip_p == IPPROTO_RSVP)
984263bc
MD
626 goto ours;
627
628 /*
629 * Check our list of addresses, to see if the packet is for us.
630 * If we don't have any addresses, assume any unicast packet
631 * we receive might be for us (and let the upper layers deal
632 * with it).
633 */
1b562c24
SZ
634 if (TAILQ_EMPTY(&in_ifaddrheads[mycpuid]) &&
635 !(m->m_flags & (M_MCAST | M_BCAST)))
984263bc
MD
636 goto ours;
637
638 /*
639 * Cache the destination address of the packet; this may be
640 * changed by use of 'ipfw fwd'.
641 */
5de23090 642 pkt_dst = next_hop ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
643
644 /*
645 * Enable a consistency check between the destination address
646 * and the arrival interface for a unicast packet (the RFC 1122
647 * strong ES model) if IP forwarding is disabled and the packet
648 * is not locally generated and the packet is not subject to
649 * 'ipfw fwd'.
650 *
651 * XXX - Checking also should be disabled if the destination
652 * address is ipnat'ed to a different interface.
653 *
654 * XXX - Checking is incompatible with IP aliases added
655 * to the loopback interface instead of the interface where
656 * the packets are received.
657 */
dffa46cd
JH
658 checkif = ip_checkinterface &&
659 !ipforwarding &&
660 m->m_pkthdr.rcvif != NULL &&
661 !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) &&
5de23090 662 next_hop == NULL;
984263bc
MD
663
664 /*
665 * Check for exact addresses in the hash bucket.
666 */
f8983475
SZ
667 LIST_FOREACH(iac, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
668 ia = iac->ia;
669
984263bc
MD
670 /*
671 * If the address matches, verify that the packet
672 * arrived via the correct interface if checking is
673 * enabled.
674 */
dffa46cd 675 if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
984263bc
MD
676 (!checkif || ia->ia_ifp == m->m_pkthdr.rcvif))
677 goto ours;
678 }
f8983475
SZ
679 ia = NULL;
680
984263bc
MD
681 /*
682 * Check for broadcast addresses.
683 *
684 * Only accept broadcast packets that arrive via the matching
685 * interface. Reception of forwarded directed broadcasts would
686 * be handled via ip_forward() and ether_output() with the loopback
687 * into the stack for SIMPLEX interfaces handled by ether_output().
688 */
689 if (m->m_pkthdr.rcvif->if_flags & IFF_BROADCAST) {
b2632176
SZ
690 struct ifaddr_container *ifac;
691
692 TAILQ_FOREACH(ifac, &m->m_pkthdr.rcvif->if_addrheads[mycpuid],
693 ifa_link) {
694 struct ifaddr *ifa = ifac->ifa;
695
83a415f4
MD
696 if (ifa->ifa_addr == NULL) /* shutdown/startup race */
697 continue;
984263bc
MD
698 if (ifa->ifa_addr->sa_family != AF_INET)
699 continue;
700 ia = ifatoia(ifa);
701 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
dffa46cd 702 pkt_dst.s_addr)
984263bc
MD
703 goto ours;
704 if (ia->ia_netbroadcast.s_addr == pkt_dst.s_addr)
705 goto ours;
706#ifdef BOOTP_COMPAT
707 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
708 goto ours;
709#endif
710 }
711 }
712 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
713 struct in_multi *inm;
5fe66e68 714
87b66be9
SZ
715 /* XXX Multicast is not MPSAFE yet */
716 get_mplock();
717
5fe66e68 718 if (ip_mrouter != NULL) {
984263bc
MD
719 /*
720 * If we are acting as a multicast router, all
721 * incoming multicast packets are passed to the
722 * kernel-level multicast forwarding function.
723 * The packet is returned (relatively) intact; if
724 * ip_mforward() returns a non-zero value, the packet
725 * must be discarded, else it may be accepted below.
726 */
5fe66e68 727 if (ip_mforward != NULL &&
dffa46cd 728 ip_mforward(ip, m->m_pkthdr.rcvif, m, NULL) != 0) {
87b66be9 729 rel_mplock();
984263bc
MD
730 ipstat.ips_cantforward++;
731 m_freem(m);
732 return;
733 }
734
735 /*
736 * The process-level routing daemon needs to receive
737 * all multicast IGMP packets, whether or not this
738 * host belongs to their destination groups.
739 */
87b66be9
SZ
740 if (ip->ip_p == IPPROTO_IGMP) {
741 rel_mplock();
984263bc 742 goto ours;
87b66be9 743 }
984263bc
MD
744 ipstat.ips_forward++;
745 }
746 /*
747 * See if we belong to the destination multicast group on the
748 * arrival interface.
749 */
750 IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
751 if (inm == NULL) {
87b66be9 752 rel_mplock();
984263bc
MD
753 ipstat.ips_notmember++;
754 m_freem(m);
755 return;
756 }
87b66be9
SZ
757
758 rel_mplock();
984263bc
MD
759 goto ours;
760 }
dffa46cd 761 if (ip->ip_dst.s_addr == INADDR_BROADCAST)
984263bc
MD
762 goto ours;
763 if (ip->ip_dst.s_addr == INADDR_ANY)
764 goto ours;
765
766 /*
767 * FAITH(Firewall Aided Internet Translator)
768 */
769 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) {
770 if (ip_keepfaith) {
dffa46cd 771 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
984263bc
MD
772 goto ours;
773 }
774 m_freem(m);
775 return;
776 }
777
778 /*
779 * Not for us; forward if possible and desirable.
780 */
dffa46cd 781 if (!ipforwarding) {
984263bc
MD
782 ipstat.ips_cantforward++;
783 m_freem(m);
784 } else {
785#ifdef IPSEC
786 /*
787 * Enforce inbound IPsec SPD.
788 */
789 if (ipsec4_in_reject(m, NULL)) {
790 ipsecstat.in_polvio++;
791 goto bad;
792 }
dffa46cd 793#endif
984263bc
MD
794#ifdef FAST_IPSEC
795 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 796 crit_enter();
984263bc 797 if (mtag != NULL) {
d031aa80 798 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
799 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
800 } else {
801 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 802 IP_FORWARDING, &error);
984263bc
MD
803 }
804 if (sp == NULL) { /* NB: can happen if error */
1cae611f 805 crit_exit();
984263bc
MD
806 /*XXX error stat???*/
807 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
808 goto bad;
809 }
810
811 /*
812 * Check security policy against packet attributes.
813 */
814 error = ipsec_in_reject(sp, m);
815 KEY_FREESP(&sp);
1cae611f 816 crit_exit();
984263bc
MD
817 if (error) {
818 ipstat.ips_cantforward++;
819 goto bad;
820 }
dffa46cd 821#endif
5de23090 822 ip_forward(m, using_srcrt, next_hop);
984263bc
MD
823 }
824 return;
825
826ours:
dffa46cd 827
984263bc
MD
828 /*
829 * IPSTEALTH: Process non-routing options only
830 * if the packet is destined for us.
831 */
dffa46cd
JH
832 if (ipstealth &&
833 hlen > sizeof(struct ip) &&
5de23090 834 ip_dooptions(m, 1, next_hop))
984263bc 835 return;
984263bc
MD
836
837 /* Count the packet in the ip address stats */
838 if (ia != NULL) {
839 ia->ia_ifa.if_ipackets++;
840 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
841 }
842
843 /*
844 * If offset or IP_MF are set, must reassemble.
845 * Otherwise, nothing need be done.
846 * (We could look in the reassembly queue to see
847 * if the packet was previously fragmented,
848 * but it's not worth the time; just let them time out.)
849 */
850 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
984263bc 851 /*
c3c96e44
MD
852 * Attempt reassembly; if it succeeds, proceed. ip_reass()
853 * will return a different mbuf.
854 *
855 * NOTE: ip_reass() returns m with M_HASH cleared to force
856 * us to recharacterize the packet.
984263bc 857 */
b0cb7c2c 858 m = ip_reass(m);
dffa46cd 859 if (m == NULL)
984263bc 860 return;
984263bc 861 ip = mtod(m, struct ip *);
b0cb7c2c 862
984263bc
MD
863 /* Get the header length of the reassembled packet */
864 hlen = IP_VHL_HL(ip->ip_vhl) << 2;
bf82f9b7 865 } else {
984263bc 866 ip->ip_len -= hlen;
bf82f9b7 867 }
984263bc 868
984263bc
MD
869#ifdef IPSEC
870 /*
871 * enforce IPsec policy checking if we are seeing last header.
872 * note that we do not visit this with protocols with pcb layer
873 * code - like udp/tcp/raw ip.
874 */
dffa46cd 875 if ((inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) &&
984263bc
MD
876 ipsec4_in_reject(m, NULL)) {
877 ipsecstat.in_polvio++;
878 goto bad;
879 }
880#endif
881#if FAST_IPSEC
882 /*
883 * enforce IPsec policy checking if we are seeing last header.
884 * note that we do not visit this with protocols with pcb layer
885 * code - like udp/tcp/raw ip.
886 */
dffa46cd 887 if (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) {
984263bc
MD
888 /*
889 * Check if the packet has already had IPsec processing
890 * done. If so, then just pass it along. This tag gets
891 * set during AH, ESP, etc. input handling, before the
892 * packet is returned to the ip input queue for delivery.
dffa46cd 893 */
984263bc 894 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
1cae611f 895 crit_enter();
984263bc 896 if (mtag != NULL) {
d031aa80 897 tdbi = (struct tdb_ident *)m_tag_data(mtag);
984263bc
MD
898 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
899 } else {
900 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
dffa46cd 901 IP_FORWARDING, &error);
984263bc
MD
902 }
903 if (sp != NULL) {
904 /*
905 * Check security policy against packet attributes.
906 */
907 error = ipsec_in_reject(sp, m);
908 KEY_FREESP(&sp);
909 } else {
910 /* XXX error stat??? */
911 error = EINVAL;
912DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
913 goto bad;
914 }
1cae611f 915 crit_exit();
984263bc
MD
916 if (error)
917 goto bad;
918 }
919#endif /* FAST_IPSEC */
920
a40c0023 921 /*
6a704092
MD
922 * We must forward the packet to the correct protocol thread if
923 * we are not already in it.
c3c96e44
MD
924 *
925 * NOTE: ip_len is now in host form. ip_len is not adjusted
926 * further for protocol processing, instead we pass hlen
927 * to the protosw and let it deal with it.
a40c0023 928 */
984263bc 929 ipstat.ips_delivered++;
984263bc 930
c3c96e44
MD
931 if ((m->m_flags & M_HASH) == 0) {
932 ++ip_dispatch_recheck;
76c4458a 933 ip->ip_len = htons(ip->ip_len + hlen);
c3c96e44
MD
934 ip->ip_off = htons(ip->ip_off);
935
936 ip_cpufn(&m, 0, IP_MPORT_IN);
937 if (m == NULL)
938 return;
939
940 ip = mtod(m, struct ip *);
76c4458a 941 ip->ip_len = ntohs(ip->ip_len) - hlen;
c3c96e44
MD
942 ip->ip_off = ntohs(ip->ip_off);
943 KKASSERT(m->m_flags & M_HASH);
944 }
945 port = cpu_portfn(m->m_pkthdr.hash);
946
6a704092
MD
947 if (port != &curthread->td_msgport) {
948 struct netmsg_packet *pmsg;
35658e20 949
c3c96e44
MD
950 ++ip_dispatch_slow;
951
3d6057fe 952 pmsg = &m->m_hdr.mh_netmsg;
002c1265 953 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
c3c96e44 954 0, transport_processing_handler);
3d6057fe 955 pmsg->nm_packet = m;
002c1265
MD
956 pmsg->base.lmsg.u.ms_result = hlen;
957 lwkt_sendmsg(port, &pmsg->base.lmsg);
0c7ac0cd 958 } else {
c3c96e44 959 ++ip_dispatch_fast;
5de23090 960 transport_processing_oncpu(m, hlen, ip);
bf82f9b7 961 }
984263bc 962 return;
a80cf23b 963
984263bc
MD
964bad:
965 m_freem(m);
966}
967
968/*
984263bc
MD
969 * Take incoming datagram fragment and try to reassemble it into
970 * whole datagram. If a chain for reassembly of this datagram already
971 * exists, then it is given as fp; otherwise have to make a chain.
984263bc 972 */
0030d31a 973struct mbuf *
b0cb7c2c 974ip_reass(struct mbuf *m)
984263bc
MD
975{
976 struct ip *ip = mtod(m, struct ip *);
dffa46cd 977 struct mbuf *p = NULL, *q, *nq;
2b89bacf 978 struct mbuf *n;
9691feb6 979 struct ipq *fp = NULL;
83c38804 980 struct ipqhead *head;
984263bc
MD
981 int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
982 int i, next;
9691feb6 983 u_short sum;
984263bc 984
9691feb6
SZ
985 /* If maxnipq is 0, never accept fragments. */
986 if (maxnipq == 0) {
987 ipstat.ips_fragments++;
988 ipstat.ips_fragdropped++;
989 m_freem(m);
990 return NULL;
991 }
992
993 sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
994 /*
995 * Look for queue of fragments of this datagram.
996 */
2d23a8be 997 lwkt_gettoken(&ipq_token);
83c38804
PA
998 head = &ipq[sum];
999 TAILQ_FOREACH(fp, head, ipq_list) {
9691feb6
SZ
1000 if (ip->ip_id == fp->ipq_id &&
1001 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
1002 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
1003 ip->ip_p == fp->ipq_p)
1004 goto found;
2d23a8be 1005 }
9691feb6
SZ
1006
1007 fp = NULL;
1008
1009 /*
1010 * Enforce upper bound on number of fragmented packets
1011 * for which we attempt reassembly;
1012 * If maxnipq is -1, accept all fragments without limitation.
1013 */
1014 if (nipq > maxnipq && maxnipq > 0) {
1015 /*
1016 * drop something from the tail of the current queue
1017 * before proceeding further
1018 */
83c38804
PA
1019 struct ipq *q = TAILQ_LAST(head, ipqhead);
1020 if (q == NULL) {
1021 /*
1022 * The current queue is empty,
1023 * so drop from one of the others.
1024 */
9691feb6 1025 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1026 struct ipq *r = TAILQ_LAST(&ipq[i], ipqhead);
1027 if (r) {
1028 ipstat.ips_fragtimeout += r->ipq_nfrags;
1029 ip_freef(&ipq[i], r);
9691feb6
SZ
1030 break;
1031 }
1032 }
1033 } else {
83c38804
PA
1034 ipstat.ips_fragtimeout += q->ipq_nfrags;
1035 ip_freef(head, q);
9691feb6
SZ
1036 }
1037 }
1038found:
1039 /*
1040 * Adjust ip_len to not reflect header,
1041 * convert offset of this to bytes.
1042 */
1043 ip->ip_len -= hlen;
1044 if (ip->ip_off & IP_MF) {
1045 /*
1046 * Make sure that fragments have a data length
1047 * that's a non-zero multiple of 8 bytes.
1048 */
1049 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
1050 ipstat.ips_toosmall++; /* XXX */
1051 m_freem(m);
2d23a8be 1052 goto done;
9691feb6
SZ
1053 }
1054 m->m_flags |= M_FRAG;
2d23a8be 1055 } else {
9691feb6 1056 m->m_flags &= ~M_FRAG;
2d23a8be 1057 }
9691feb6
SZ
1058 ip->ip_off <<= 3;
1059
1060 ipstat.ips_fragments++;
1061 m->m_pkthdr.header = ip;
1062
984263bc 1063 /*
fbb35ef0
SZ
1064 * If the hardware has not done csum over this fragment
1065 * then csum_data is not valid at all.
1066 */
1067 if ((m->m_pkthdr.csum_flags & (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID))
1068 == (CSUM_FRAG_NOT_CHECKED | CSUM_DATA_VALID)) {
1069 m->m_pkthdr.csum_data = 0;
1070 m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
1071 }
1072
1073 /*
984263bc
MD
1074 * Presence of header sizes in mbufs
1075 * would confuse code below.
1076 */
1077 m->m_data += hlen;
1078 m->m_len -= hlen;
1079
1080 /*
1081 * If first fragment to arrive, create a reassembly queue.
1082 */
dffa46cd 1083 if (fp == NULL) {
2b89bacf 1084 if ((fp = mpipe_alloc_nowait(&ipq_mpipe)) == NULL)
984263bc 1085 goto dropfrag;
83c38804 1086 TAILQ_INSERT_HEAD(head, fp, ipq_list);
984263bc
MD
1087 nipq++;
1088 fp->ipq_nfrags = 1;
1089 fp->ipq_ttl = IPFRAGTTL;
1090 fp->ipq_p = ip->ip_p;
1091 fp->ipq_id = ip->ip_id;
1092 fp->ipq_src = ip->ip_src;
1093 fp->ipq_dst = ip->ip_dst;
1094 fp->ipq_frags = m;
1095 m->m_nextpkt = NULL;
984263bc
MD
1096 goto inserted;
1097 } else {
1098 fp->ipq_nfrags++;
1099 }
1100
dffa46cd 1101#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
984263bc
MD
1102
1103 /*
1104 * Find a segment which begins after this one does.
1105 */
2d23a8be 1106 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
984263bc
MD
1107 if (GETIP(q)->ip_off > ip->ip_off)
1108 break;
2d23a8be 1109 }
984263bc
MD
1110
1111 /*
1112 * If there is a preceding segment, it may provide some of
1113 * our data already. If so, drop the data from the incoming
1114 * segment. If it provides all of our data, drop us, otherwise
1115 * stick new segment in the proper place.
1116 *
1117 * If some of the data is dropped from the the preceding
1118 * segment, then it's checksum is invalidated.
1119 */
1120 if (p) {
1121 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1122 if (i > 0) {
1123 if (i >= ip->ip_len)
1124 goto dropfrag;
1125 m_adj(m, i);
1126 m->m_pkthdr.csum_flags = 0;
1127 ip->ip_off += i;
1128 ip->ip_len -= i;
1129 }
1130 m->m_nextpkt = p->m_nextpkt;
1131 p->m_nextpkt = m;
1132 } else {
1133 m->m_nextpkt = fp->ipq_frags;
1134 fp->ipq_frags = m;
1135 }
1136
1137 /*
1138 * While we overlap succeeding segments trim them or,
1139 * if they are completely covered, dequeue them.
1140 */
1141 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1142 q = nq) {
dffa46cd 1143 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
984263bc
MD
1144 if (i < GETIP(q)->ip_len) {
1145 GETIP(q)->ip_len -= i;
1146 GETIP(q)->ip_off += i;
1147 m_adj(q, i);
1148 q->m_pkthdr.csum_flags = 0;
1149 break;
1150 }
1151 nq = q->m_nextpkt;
1152 m->m_nextpkt = nq;
1153 ipstat.ips_fragdropped++;
1154 fp->ipq_nfrags--;
c4933956 1155 q->m_nextpkt = NULL;
984263bc
MD
1156 m_freem(q);
1157 }
1158
1159inserted:
984263bc
MD
1160 /*
1161 * Check for complete reassembly and perform frag per packet
1162 * limiting.
1163 *
1164 * Frag limiting is performed here so that the nth frag has
1165 * a chance to complete the packet before we drop the packet.
1166 * As a result, n+1 frags are actually allowed per packet, but
1167 * only n will ever be stored. (n = maxfragsperpacket.)
1168 *
1169 */
1170 next = 0;
1171 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1172 if (GETIP(q)->ip_off != next) {
1173 if (fp->ipq_nfrags > maxfragsperpacket) {
1174 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1175 ip_freef(head, fp);
984263bc 1176 }
2d23a8be 1177 goto done;
984263bc
MD
1178 }
1179 next += GETIP(q)->ip_len;
1180 }
1181 /* Make sure the last packet didn't have the IP_MF flag */
1182 if (p->m_flags & M_FRAG) {
1183 if (fp->ipq_nfrags > maxfragsperpacket) {
1184 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1185 ip_freef(head, fp);
984263bc 1186 }
2d23a8be 1187 goto done;
984263bc
MD
1188 }
1189
1190 /*
1191 * Reassembly is complete. Make sure the packet is a sane size.
1192 */
1193 q = fp->ipq_frags;
1194 ip = GETIP(q);
1195 if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
1196 ipstat.ips_toolong++;
1197 ipstat.ips_fragdropped += fp->ipq_nfrags;
83c38804 1198 ip_freef(head, fp);
2d23a8be 1199 goto done;
984263bc
MD
1200 }
1201
1202 /*
1203 * Concatenate fragments.
1204 */
1205 m = q;
2b89bacf 1206 n = m->m_next;
dffa46cd 1207 m->m_next = NULL;
2b89bacf 1208 m_cat(m, n);
984263bc 1209 nq = q->m_nextpkt;
dffa46cd 1210 q->m_nextpkt = NULL;
984263bc
MD
1211 for (q = nq; q != NULL; q = nq) {
1212 nq = q->m_nextpkt;
1213 q->m_nextpkt = NULL;
1214 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1215 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1216 m_cat(m, q);
1217 }
1218
1e7aea7f
MD
1219 /*
1220 * Clean up the 1's complement checksum. Carry over 16 bits must
1221 * be added back. This assumes no more then 65535 packet fragments
37ed010a 1222 * were reassembled. A second carry can also occur (but not a third).
1e7aea7f
MD
1223 */
1224 m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) +
1225 (m->m_pkthdr.csum_data >> 16);
37ed010a
MD
1226 if (m->m_pkthdr.csum_data > 0xFFFF)
1227 m->m_pkthdr.csum_data -= 0xFFFF;
1e7aea7f 1228
984263bc
MD
1229 /*
1230 * Create header for new ip packet by
1231 * modifying header of first packet;
1232 * dequeue and discard fragment reassembly header.
1233 * Make header visible.
1234 */
1235 ip->ip_len = next;
1236 ip->ip_src = fp->ipq_src;
1237 ip->ip_dst = fp->ipq_dst;
83c38804 1238 TAILQ_REMOVE(head, fp, ipq_list);
984263bc 1239 nipq--;
2b89bacf 1240 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1241 m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
1242 m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
1243 /* some debugging cruft by sklower, below, will go away soon */
1244 if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */
2256ba69 1245 int plen = 0;
dffa46cd 1246
2b89bacf
MD
1247 for (n = m; n; n = n->m_next)
1248 plen += n->m_len;
984263bc
MD
1249 m->m_pkthdr.len = plen;
1250 }
d2f6f5b2 1251
c3c96e44
MD
1252 /*
1253 * Reassembly complete, return the next protocol.
1254 *
1255 * Be sure to clear M_HASH to force the packet
1256 * to be re-characterized.
1257 *
1258 * Clear M_FRAG, we are no longer a fragment.
1259 */
1260 m->m_flags &= ~(M_HASH | M_FRAG);
1261
d2f6f5b2 1262 ipstat.ips_reassembled++;
2d23a8be 1263 lwkt_reltoken(&ipq_token);
984263bc
MD
1264 return (m);
1265
1266dropfrag:
984263bc 1267 ipstat.ips_fragdropped++;
dffa46cd 1268 if (fp != NULL)
984263bc
MD
1269 fp->ipq_nfrags--;
1270 m_freem(m);
2d23a8be
MD
1271done:
1272 lwkt_reltoken(&ipq_token);
dffa46cd 1273 return (NULL);
984263bc
MD
1274
1275#undef GETIP
1276}
1277
1278/*
1279 * Free a fragment reassembly header and all
1280 * associated datagrams.
2d23a8be
MD
1281 *
1282 * Called with ipq_token held.
984263bc
MD
1283 */
1284static void
83c38804 1285ip_freef(struct ipqhead *fhp, struct ipq *fp)
984263bc 1286{
2256ba69 1287 struct mbuf *q;
984263bc 1288
2d23a8be
MD
1289 /*
1290 * Remove first to protect against blocking
1291 */
83c38804 1292 TAILQ_REMOVE(fhp, fp, ipq_list);
2d23a8be
MD
1293
1294 /*
1295 * Clean out at our leisure
1296 */
984263bc
MD
1297 while (fp->ipq_frags) {
1298 q = fp->ipq_frags;
1299 fp->ipq_frags = q->m_nextpkt;
c4933956 1300 q->m_nextpkt = NULL;
984263bc
MD
1301 m_freem(q);
1302 }
2b89bacf 1303 mpipe_free(&ipq_mpipe, fp);
984263bc
MD
1304 nipq--;
1305}
1306
1307/*
1308 * IP timer processing;
1309 * if a timer expires on a reassembly
1310 * queue, discard it.
1311 */
1312void
8a3125c6 1313ip_slowtimo(void)
984263bc 1314{
83c38804
PA
1315 struct ipq *fp, *fp_temp;
1316 struct ipqhead *head;
984263bc
MD
1317 int i;
1318
2d23a8be 1319 lwkt_gettoken(&ipq_token);
984263bc 1320 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1321 head = &ipq[i];
1322 TAILQ_FOREACH_MUTABLE(fp, head, ipq_list, fp_temp) {
1323 if (--fp->ipq_ttl == 0) {
1324 ipstat.ips_fragtimeout += fp->ipq_nfrags;
1325 ip_freef(head, fp);
984263bc
MD
1326 }
1327 }
1328 }
1329 /*
1330 * If we are over the maximum number of fragments
1331 * (due to the limit being lowered), drain off
1332 * enough to get down to the new limit.
1333 */
1334 if (maxnipq >= 0 && nipq > maxnipq) {
1335 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1336 head = &ipq[i];
1337 while (nipq > maxnipq && !TAILQ_EMPTY(head)) {
984263bc 1338 ipstat.ips_fragdropped +=
83c38804
PA
1339 TAILQ_FIRST(head)->ipq_nfrags;
1340 ip_freef(head, TAILQ_FIRST(head));
984263bc
MD
1341 }
1342 }
1343 }
2d23a8be 1344 lwkt_reltoken(&ipq_token);
984263bc 1345 ipflow_slowtimo();
984263bc
MD
1346}
1347
1348/*
1349 * Drain off all datagram fragments.
1350 */
1351void
8a3125c6 1352ip_drain(void)
984263bc 1353{
83c38804 1354 struct ipqhead *head;
dffa46cd 1355 int i;
984263bc 1356
2d23a8be 1357 lwkt_gettoken(&ipq_token);
984263bc 1358 for (i = 0; i < IPREASS_NHASH; i++) {
83c38804
PA
1359 head = &ipq[i];
1360 while (!TAILQ_EMPTY(head)) {
1361 ipstat.ips_fragdropped += TAILQ_FIRST(head)->ipq_nfrags;
1362 ip_freef(head, TAILQ_FIRST(head));
984263bc
MD
1363 }
1364 }
2d23a8be 1365 lwkt_reltoken(&ipq_token);
984263bc
MD
1366 in_rtqdrain();
1367}
1368
1369/*
1370 * Do option processing on a datagram,
1371 * possibly discarding it if bad options are encountered,
1372 * or forwarding it if source-routed.
1373 * The pass argument is used when operating in the IPSTEALTH
1374 * mode to tell what options to process:
1375 * [LS]SRR (pass 0) or the others (pass 1).
1376 * The reason for as many as two passes is that when doing IPSTEALTH,
1377 * non-routing options should be processed only if the packet is for us.
1378 * Returns 1 if packet has been forwarded/freed,
1379 * 0 if the packet should be processed further.
1380 */
1381static int
1382ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop)
1383{
407e896e 1384 struct sockaddr_in ipaddr = { sizeof ipaddr, AF_INET };
984263bc
MD
1385 struct ip *ip = mtod(m, struct ip *);
1386 u_char *cp;
1387 struct in_ifaddr *ia;
dffa46cd
JH
1388 int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB;
1389 boolean_t forward = FALSE;
984263bc
MD
1390 struct in_addr *sin, dst;
1391 n_time ntime;
1392
1393 dst = ip->ip_dst;
1394 cp = (u_char *)(ip + 1);
dffa46cd 1395 cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc
MD
1396 for (; cnt > 0; cnt -= optlen, cp += optlen) {
1397 opt = cp[IPOPT_OPTVAL];
1398 if (opt == IPOPT_EOL)
1399 break;
1400 if (opt == IPOPT_NOP)
1401 optlen = 1;
1402 else {
1403 if (cnt < IPOPT_OLEN + sizeof(*cp)) {
1404 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1405 goto bad;
1406 }
1407 optlen = cp[IPOPT_OLEN];
1408 if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1409 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1410 goto bad;
1411 }
1412 }
1413 switch (opt) {
1414
1415 default:
1416 break;
1417
1418 /*
1419 * Source routing with record.
1420 * Find interface with current destination address.
1421 * If none on this machine then drop if strictly routed,
1422 * or do nothing if loosely routed.
1423 * Record interface address and bring up next address
1424 * component. If strictly routed make sure next
1425 * address is on directly accessible net.
1426 */
1427 case IPOPT_LSRR:
1428 case IPOPT_SSRR:
984263bc
MD
1429 if (ipstealth && pass > 0)
1430 break;
984263bc
MD
1431 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1432 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1433 goto bad;
1434 }
1435 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1436 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1437 goto bad;
1438 }
1439 ipaddr.sin_addr = ip->ip_dst;
1440 ia = (struct in_ifaddr *)
1441 ifa_ifwithaddr((struct sockaddr *)&ipaddr);
dffa46cd 1442 if (ia == NULL) {
984263bc
MD
1443 if (opt == IPOPT_SSRR) {
1444 type = ICMP_UNREACH;
1445 code = ICMP_UNREACH_SRCFAIL;
1446 goto bad;
1447 }
1448 if (!ip_dosourceroute)
1449 goto nosourcerouting;
1450 /*
1451 * Loose routing, and not at next destination
1452 * yet; nothing to do except forward.
1453 */
1454 break;
1455 }
1456 off--; /* 0 origin */
1457 if (off > optlen - (int)sizeof(struct in_addr)) {
1458 /*
1459 * End of source route. Should be for us.
1460 */
1461 if (!ip_acceptsourceroute)
1462 goto nosourcerouting;
7e31206a 1463 save_rte(m, cp, ip->ip_src);
984263bc
MD
1464 break;
1465 }
984263bc
MD
1466 if (ipstealth)
1467 goto dropit;
984263bc
MD
1468 if (!ip_dosourceroute) {
1469 if (ipforwarding) {
1141eb20
JH
1470 char buf[sizeof "aaa.bbb.ccc.ddd"];
1471
984263bc
MD
1472 /*
1473 * Acting as a router, so generate ICMP
1474 */
1475nosourcerouting:
1476 strcpy(buf, inet_ntoa(ip->ip_dst));
dffa46cd 1477 log(LOG_WARNING,
984263bc
MD
1478 "attempted source route from %s to %s\n",
1479 inet_ntoa(ip->ip_src), buf);
1480 type = ICMP_UNREACH;
1481 code = ICMP_UNREACH_SRCFAIL;
1482 goto bad;
1483 } else {
1484 /*
dffa46cd
JH
1485 * Not acting as a router,
1486 * so silently drop.
984263bc 1487 */
984263bc 1488dropit:
984263bc
MD
1489 ipstat.ips_cantforward++;
1490 m_freem(m);
1491 return (1);
1492 }
1493 }
1494
1495 /*
1496 * locate outgoing interface
1497 */
f23061d4
JH
1498 memcpy(&ipaddr.sin_addr, cp + off,
1499 sizeof ipaddr.sin_addr);
984263bc
MD
1500
1501 if (opt == IPOPT_SSRR) {
1502#define INA struct in_ifaddr *
1503#define SA struct sockaddr *
dffa46cd
JH
1504 if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr))
1505 == NULL)
1506 ia = (INA)ifa_ifwithnet((SA)&ipaddr);
d27ef928
SZ
1507 } else {
1508 ia = ip_rtaddr(ipaddr.sin_addr, NULL);
1509 }
dffa46cd 1510 if (ia == NULL) {
984263bc
MD
1511 type = ICMP_UNREACH;
1512 code = ICMP_UNREACH_SRCFAIL;
1513 goto bad;
1514 }
1515 ip->ip_dst = ipaddr.sin_addr;
f23061d4 1516 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1517 sizeof(struct in_addr));
1518 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1519 /*
1520 * Let ip_intr's mcast routing check handle mcast pkts
1521 */
1522 forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr));
1523 break;
1524
1525 case IPOPT_RR:
984263bc
MD
1526 if (ipstealth && pass == 0)
1527 break;
984263bc
MD
1528 if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
1529 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1530 goto bad;
1531 }
1532 if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
1533 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1534 goto bad;
1535 }
1536 /*
1537 * If no space remains, ignore.
1538 */
1539 off--; /* 0 origin */
1540 if (off > optlen - (int)sizeof(struct in_addr))
1541 break;
f23061d4
JH
1542 memcpy(&ipaddr.sin_addr, &ip->ip_dst,
1543 sizeof ipaddr.sin_addr);
984263bc
MD
1544 /*
1545 * locate outgoing interface; if we're the destination,
1546 * use the incoming interface (should be same).
1547 */
dffa46cd 1548 if ((ia = (INA)ifa_ifwithaddr((SA)&ipaddr)) == NULL &&
d27ef928 1549 (ia = ip_rtaddr(ipaddr.sin_addr, NULL)) == NULL) {
984263bc
MD
1550 type = ICMP_UNREACH;
1551 code = ICMP_UNREACH_HOST;
1552 goto bad;
1553 }
f23061d4 1554 memcpy(cp + off, &IA_SIN(ia)->sin_addr,
984263bc
MD
1555 sizeof(struct in_addr));
1556 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1557 break;
1558
1559 case IPOPT_TS:
984263bc
MD
1560 if (ipstealth && pass == 0)
1561 break;
984263bc
MD
1562 code = cp - (u_char *)ip;
1563 if (optlen < 4 || optlen > 40) {
1564 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1565 goto bad;
1566 }
1567 if ((off = cp[IPOPT_OFFSET]) < 5) {
1568 code = &cp[IPOPT_OLEN] - (u_char *)ip;
1569 goto bad;
1570 }
1571 if (off > optlen - (int)sizeof(int32_t)) {
1572 cp[IPOPT_OFFSET + 1] += (1 << 4);
1573 if ((cp[IPOPT_OFFSET + 1] & 0xf0) == 0) {
1574 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1575 goto bad;
1576 }
1577 break;
1578 }
1579 off--; /* 0 origin */
1580 sin = (struct in_addr *)(cp + off);
1581 switch (cp[IPOPT_OFFSET + 1] & 0x0f) {
1582
1583 case IPOPT_TS_TSONLY:
1584 break;
1585
1586 case IPOPT_TS_TSANDADDR:
1587 if (off + sizeof(n_time) +
1588 sizeof(struct in_addr) > optlen) {
1589 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1590 goto bad;
1591 }
1592 ipaddr.sin_addr = dst;
1593 ia = (INA)ifaof_ifpforaddr((SA)&ipaddr,
1594 m->m_pkthdr.rcvif);
dffa46cd 1595 if (ia == NULL)
984263bc 1596 continue;
f23061d4 1597 memcpy(sin, &IA_SIN(ia)->sin_addr,
984263bc
MD
1598 sizeof(struct in_addr));
1599 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1600 off += sizeof(struct in_addr);
1601 break;
1602
1603 case IPOPT_TS_PRESPEC:
1604 if (off + sizeof(n_time) +
1605 sizeof(struct in_addr) > optlen) {
1606 code = &cp[IPOPT_OFFSET] - (u_char *)ip;
1607 goto bad;
1608 }
f23061d4 1609 memcpy(&ipaddr.sin_addr, sin,
984263bc 1610 sizeof(struct in_addr));
dffa46cd 1611 if (ifa_ifwithaddr((SA)&ipaddr) == NULL)
984263bc
MD
1612 continue;
1613 cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1614 off += sizeof(struct in_addr);
1615 break;
1616
1617 default:
1618 code = &cp[IPOPT_OFFSET + 1] - (u_char *)ip;
1619 goto bad;
1620 }
1621 ntime = iptime();
f23061d4 1622 memcpy(cp + off, &ntime, sizeof(n_time));
984263bc
MD
1623 cp[IPOPT_OFFSET] += sizeof(n_time);
1624 }
1625 }
1626 if (forward && ipforwarding) {
41332872 1627 ip_forward(m, TRUE, next_hop);
984263bc
MD
1628 return (1);
1629 }
1630 return (0);
1631bad:
981773b8 1632 icmp_error(m, type, code, 0, 0);
984263bc
MD
1633 ipstat.ips_badoptions++;
1634 return (1);
1635}
1636
1637/*
1638 * Given address of next destination (final or next hop),
1639 * return internet address info of interface to be used to get there.
1640 */
1641struct in_ifaddr *
d27ef928 1642ip_rtaddr(struct in_addr dst, struct route *ro0)
984263bc 1643{
d27ef928 1644 struct route sro, *ro;
2256ba69 1645 struct sockaddr_in *sin;
d27ef928
SZ
1646 struct in_ifaddr *ia;
1647
1648 if (ro0 != NULL) {
1649 ro = ro0;
1650 } else {
1651 bzero(&sro, sizeof(sro));
1652 ro = &sro;
1653 }
984263bc 1654
41332872 1655 sin = (struct sockaddr_in *)&ro->ro_dst;
984263bc 1656
41332872
JH
1657 if (ro->ro_rt == NULL || dst.s_addr != sin->sin_addr.s_addr) {
1658 if (ro->ro_rt != NULL) {
1659 RTFREE(ro->ro_rt);
1660 ro->ro_rt = NULL;
984263bc
MD
1661 }
1662 sin->sin_family = AF_INET;
5fe66e68 1663 sin->sin_len = sizeof *sin;
984263bc 1664 sin->sin_addr = dst;
41332872 1665 rtalloc_ign(ro, RTF_PRCLONING);
984263bc 1666 }
dffa46cd 1667
41332872 1668 if (ro->ro_rt == NULL)
dffa46cd
JH
1669 return (NULL);
1670
d27ef928
SZ
1671 ia = ifatoia(ro->ro_rt->rt_ifa);
1672
1673 if (ro == &sro)
1674 RTFREE(ro->ro_rt);
1675 return ia;
984263bc
MD
1676}
1677
1678/*
1679 * Save incoming source route for use in replies,
1680 * to be picked up later by ip_srcroute if the receiver is interested.
1681 */
102cfd56 1682static void
7e31206a 1683save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
984263bc 1684{
7e31206a
SZ
1685 struct m_tag *mtag;
1686 struct ip_srcrt_opt *opt;
984263bc
MD
1687 unsigned olen;
1688
7e31206a
SZ
1689 mtag = m_tag_get(PACKET_TAG_IPSRCRT, sizeof(*opt), MB_DONTWAIT);
1690 if (mtag == NULL)
1691 return;
1692 opt = m_tag_data(mtag);
1693
984263bc
MD
1694 olen = option[IPOPT_OLEN];
1695#ifdef DIAGNOSTIC
1696 if (ipprintfs)
a6ec04bc 1697 kprintf("save_rte: olen %d\n", olen);
984263bc 1698#endif
7e31206a
SZ
1699 if (olen > sizeof(opt->ip_srcrt) - (1 + sizeof(dst))) {
1700 m_tag_free(mtag);
984263bc 1701 return;
7e31206a
SZ
1702 }
1703 bcopy(option, opt->ip_srcrt.srcopt, olen);
1704 opt->ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
1705 opt->ip_srcrt.dst = dst;
1706 m_tag_prepend(m, mtag);
984263bc
MD
1707}
1708
1709/*
1710 * Retrieve incoming source route for use in replies,
1711 * in the same form used by setsockopt.
1712 * The first hop is placed before the options, will be removed later.
1713 */
1714struct mbuf *
7e31206a 1715ip_srcroute(struct mbuf *m0)
984263bc 1716{
2256ba69
RG
1717 struct in_addr *p, *q;
1718 struct mbuf *m;
7e31206a
SZ
1719 struct m_tag *mtag;
1720 struct ip_srcrt_opt *opt;
1721
1722 if (m0 == NULL)
1723 return NULL;
984263bc 1724
7e31206a
SZ
1725 mtag = m_tag_find(m0, PACKET_TAG_IPSRCRT, NULL);
1726 if (mtag == NULL)
1727 return NULL;
1728 opt = m_tag_data(mtag);
1729
1730 if (opt->ip_nhops == 0)
dffa46cd 1731 return (NULL);
74f1caca 1732 m = m_get(MB_DONTWAIT, MT_HEADER);
dffa46cd
JH
1733 if (m == NULL)
1734 return (NULL);
984263bc 1735
7e31206a 1736#define OPTSIZ (sizeof(opt->ip_srcrt.nop) + sizeof(opt->ip_srcrt.srcopt))
984263bc
MD
1737
1738 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
7e31206a
SZ
1739 m->m_len = opt->ip_nhops * sizeof(struct in_addr) +
1740 sizeof(struct in_addr) + OPTSIZ;
984263bc 1741#ifdef DIAGNOSTIC
7e31206a
SZ
1742 if (ipprintfs) {
1743 kprintf("ip_srcroute: nhops %d mlen %d",
1744 opt->ip_nhops, m->m_len);
1745 }
984263bc
MD
1746#endif
1747
1748 /*
1749 * First save first hop for return route
1750 */
7e31206a 1751 p = &opt->ip_srcrt.route[opt->ip_nhops - 1];
984263bc
MD
1752 *(mtod(m, struct in_addr *)) = *p--;
1753#ifdef DIAGNOSTIC
1754 if (ipprintfs)
a6ec04bc 1755 kprintf(" hops %x", ntohl(mtod(m, struct in_addr *)->s_addr));
984263bc
MD
1756#endif
1757
1758 /*
1759 * Copy option fields and padding (nop) to mbuf.
1760 */
7e31206a
SZ
1761 opt->ip_srcrt.nop = IPOPT_NOP;
1762 opt->ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF;
1763 memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &opt->ip_srcrt.nop,
dffa46cd 1764 OPTSIZ);
984263bc
MD
1765 q = (struct in_addr *)(mtod(m, caddr_t) +
1766 sizeof(struct in_addr) + OPTSIZ);
1767#undef OPTSIZ
1768 /*
1769 * Record return path as an IP source route,
1770 * reversing the path (pointers are now aligned).
1771 */
7e31206a 1772 while (p >= opt->ip_srcrt.route) {
984263bc
MD
1773#ifdef DIAGNOSTIC
1774 if (ipprintfs)
a6ec04bc 1775 kprintf(" %x", ntohl(q->s_addr));
984263bc
MD
1776#endif
1777 *q++ = *p--;
1778 }
1779 /*
1780 * Last hop goes to final destination.
1781 */
7e31206a
SZ
1782 *q = opt->ip_srcrt.dst;
1783 m_tag_delete(m0, mtag);
984263bc
MD
1784#ifdef DIAGNOSTIC
1785 if (ipprintfs)
a6ec04bc 1786 kprintf(" %x\n", ntohl(q->s_addr));
984263bc
MD
1787#endif
1788 return (m);
1789}
1790
1791/*
bddf0751 1792 * Strip out IP options.
984263bc
MD
1793 */
1794void
bddf0751 1795ip_stripoptions(struct mbuf *m)
984263bc 1796{
bddf0751 1797 int datalen;
984263bc 1798 struct ip *ip = mtod(m, struct ip *);
2256ba69 1799 caddr_t opts;
bddf0751 1800 int optlen;
984263bc 1801
bddf0751 1802 optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
984263bc 1803 opts = (caddr_t)(ip + 1);
bddf0751
JH
1804 datalen = m->m_len - (sizeof(struct ip) + optlen);
1805 bcopy(opts + optlen, opts, datalen);
1806 m->m_len -= optlen;
984263bc 1807 if (m->m_flags & M_PKTHDR)
bddf0751 1808 m->m_pkthdr.len -= optlen;
984263bc
MD
1809 ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
1810}
1811
1812u_char inetctlerrmap[PRC_NCMDS] = {
1813 0, 0, 0, 0,
1814 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1815 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1816 EMSGSIZE, EHOSTUNREACH, 0, 0,
1817 0, 0, 0, 0,
1818 ENOPROTOOPT, ECONNREFUSED
1819};
1820
1821/*
1822 * Forward a packet. If some error occurs return the sender
1823 * an icmp packet. Note we can't always generate a meaningful
1824 * icmp message because icmp doesn't have a large enough repertoire
1825 * of codes and types.
1826 *
1827 * If not forwarding, just drop the packet. This could be confusing
1828 * if ipforwarding was zero but some routing protocol was advancing
1829 * us as a gateway to somewhere. However, we must let the routing
1830 * protocol deal with that.
1831 *
dffa46cd 1832 * The using_srcrt parameter indicates whether the packet is being forwarded
984263bc
MD
1833 * via a source route.
1834 */
33cc7bb1 1835void
41332872 1836ip_forward(struct mbuf *m, boolean_t using_srcrt, struct sockaddr_in *next_hop)
984263bc
MD
1837{
1838 struct ip *ip = mtod(m, struct ip *);
984263bc 1839 struct rtentry *rt;
6164b468 1840 struct route fwd_ro;
981773b8 1841 int error, type = 0, code = 0, destmtu = 0;
984263bc
MD
1842 struct mbuf *mcopy;
1843 n_long dest;
1844 struct in_addr pkt_dst;
984263bc 1845
be23faf1 1846 dest = INADDR_ANY;
984263bc
MD
1847 /*
1848 * Cache the destination address of the packet; this may be
1849 * changed by use of 'ipfw fwd'.
1850 */
5fe66e68 1851 pkt_dst = (next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst;
984263bc
MD
1852
1853#ifdef DIAGNOSTIC
1854 if (ipprintfs)
a6ec04bc 1855 kprintf("forward: src %x dst %x ttl %x\n",
dffa46cd 1856 ip->ip_src.s_addr, pkt_dst.s_addr, ip->ip_ttl);
984263bc
MD
1857#endif
1858
dffa46cd 1859 if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) {
984263bc
MD
1860 ipstat.ips_cantforward++;
1861 m_freem(m);
1862 return;
1863 }
dffa46cd 1864 if (!ipstealth && ip->ip_ttl <= IPTTLDEC) {
981773b8 1865 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
dffa46cd 1866 return;
984263bc 1867 }
984263bc 1868
6164b468
MD
1869 bzero(&fwd_ro, sizeof(fwd_ro));
1870 ip_rtaddr(pkt_dst, &fwd_ro);
1871 if (fwd_ro.ro_rt == NULL) {
984322d1
SZ
1872 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0);
1873 return;
984263bc 1874 }
6164b468 1875 rt = fwd_ro.ro_rt;
984263bc
MD
1876
1877 /*
1878 * Save the IP header and at most 8 bytes of the payload,
1879 * in case we need to generate an ICMP message to the src.
1880 *
1881 * XXX this can be optimized a lot by saving the data in a local
1882 * buffer on the stack (72 bytes at most), and only allocating the
1883 * mbuf if really necessary. The vast majority of the packets
1884 * are forwarded without having to send an ICMP back (either
1885 * because unnecessary, or because rate limited), so we are
1886 * really we are wasting a lot of work here.
1887 *
1888 * We don't use m_copy() because it might return a reference
1889 * to a shared cluster. Both this function and ip_output()
1890 * assume exclusive access to the IP header in `m', so any
1891 * data in a cluster may change before we reach icmp_error().
1892 */
85c8d4e6 1893 MGETHDR(mcopy, MB_DONTWAIT, m->m_type);
74f1caca 1894 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, MB_DONTWAIT)) {
984263bc
MD
1895 /*
1896 * It's probably ok if the pkthdr dup fails (because
1897 * the deep copy of the tag chain failed), but for now
1898 * be conservative and just discard the copy since
1899 * code below may some day want the tags.
1900 */
1901 m_free(mcopy);
1902 mcopy = NULL;
1903 }
1904 if (mcopy != NULL) {
1905 mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
1906 (int)ip->ip_len);
52560a13 1907 mcopy->m_pkthdr.len = mcopy->m_len;
984263bc
MD
1908 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1909 }
1910
dffa46cd 1911 if (!ipstealth)
984263bc 1912 ip->ip_ttl -= IPTTLDEC;
984263bc
MD
1913
1914 /*
1915 * If forwarding packet using same interface that it came in on,
1916 * perhaps should send a redirect to sender to shortcut a hop.
1917 * Only send redirect if source is sending directly to us,
1918 * and if packet was not source routed (or has any options).
1919 * Also, don't send redirect if forwarding using a default route
1920 * or a route modified by a redirect.
1921 */
1922 if (rt->rt_ifp == m->m_pkthdr.rcvif &&
dffa46cd
JH
1923 !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) &&
1924 satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY &&
983015c8 1925 ipsendredirects && !using_srcrt && next_hop == NULL) {
984263bc 1926 u_long src = ntohl(ip->ip_src.s_addr);
41332872 1927 struct in_ifaddr *rt_ifa = (struct in_ifaddr *)rt->rt_ifa;
984263bc 1928
41332872
JH
1929 if (rt_ifa != NULL &&
1930 (src & rt_ifa->ia_subnetmask) == rt_ifa->ia_subnet) {
dffa46cd
JH
1931 if (rt->rt_flags & RTF_GATEWAY)
1932 dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
1933 else
1934 dest = pkt_dst.s_addr;
1935 /*
1936 * Router requirements says to only send
1937 * host redirects.
1938 */
1939 type = ICMP_REDIRECT;
1940 code = ICMP_REDIRECT_HOST;
984263bc 1941#ifdef DIAGNOSTIC
dffa46cd 1942 if (ipprintfs)
a6ec04bc 1943 kprintf("redirect (%d) to %x\n", code, dest);
984263bc
MD
1944#endif
1945 }
1946 }
1947
6164b468 1948 error = ip_output(m, NULL, &fwd_ro, IP_FORWARDING, NULL, NULL);
41332872 1949 if (error == 0) {
984263bc 1950 ipstat.ips_forward++;
41332872 1951 if (type == 0) {
984263bc 1952 if (mcopy) {
6164b468 1953 ipflow_create(&fwd_ro, mcopy);
297c8124 1954 m_freem(mcopy);
984263bc 1955 }
984322d1 1956 goto done;
41332872
JH
1957 } else {
1958 ipstat.ips_redirectsent++;
984263bc 1959 }
41332872
JH
1960 } else {
1961 ipstat.ips_cantforward++;
984263bc 1962 }
41332872 1963
984263bc 1964 if (mcopy == NULL)
984322d1 1965 goto done;
41332872
JH
1966
1967 /*
1968 * Send ICMP message.
1969 */
984263bc
MD
1970
1971 switch (error) {
1972
1973 case 0: /* forwarded, but need redirect */
1974 /* type, code set above */
1975 break;
1976
1977 case ENETUNREACH: /* shouldn't happen, checked above */
1978 case EHOSTUNREACH:
1979 case ENETDOWN:
1980 case EHOSTDOWN:
1981 default:
1982 type = ICMP_UNREACH;
1983 code = ICMP_UNREACH_HOST;
1984 break;
1985
1986 case EMSGSIZE:
1987 type = ICMP_UNREACH;
1988 code = ICMP_UNREACH_NEEDFRAG;
1989#ifdef IPSEC
1990 /*
1991 * If the packet is routed over IPsec tunnel, tell the
1992 * originator the tunnel MTU.
1993 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
1994 * XXX quickhack!!!
1995 */
6164b468 1996 if (fwd_ro.ro_rt != NULL) {
984263bc
MD
1997 struct secpolicy *sp = NULL;
1998 int ipsecerror;
1999 int ipsechdr;
2000 struct route *ro;
2001
2002 sp = ipsec4_getpolicybyaddr(mcopy,
2003 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2004 IP_FORWARDING,
2005 &ipsecerror);
984263bc
MD
2006
2007 if (sp == NULL)
6164b468 2008 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2009 else {
2010 /* count IPsec header size */
2011 ipsechdr = ipsec4_hdrsiz(mcopy,
2012 IPSEC_DIR_OUTBOUND,
2013 NULL);
2014
2015 /*
2016 * find the correct route for outer IPv4
2017 * header, compute tunnel MTU.
2018 *
984263bc 2019 */
012d77ea
JH
2020 if (sp->req != NULL && sp->req->sav != NULL &&
2021 sp->req->sav->sah != NULL) {
984263bc 2022 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2023 if (ro->ro_rt != NULL &&
2024 ro->ro_rt->rt_ifp != NULL) {
981773b8 2025 destmtu =
984263bc 2026 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2027 destmtu -= ipsechdr;
984263bc
MD
2028 }
2029 }
2030
2031 key_freesp(sp);
2032 }
2033 }
2034#elif FAST_IPSEC
2035 /*
2036 * If the packet is routed over IPsec tunnel, tell the
2037 * originator the tunnel MTU.
2038 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2039 * XXX quickhack!!!
2040 */
6164b468 2041 if (fwd_ro.ro_rt != NULL) {
984263bc
MD
2042 struct secpolicy *sp = NULL;
2043 int ipsecerror;
2044 int ipsechdr;
2045 struct route *ro;
2046
2047 sp = ipsec_getpolicybyaddr(mcopy,
2048 IPSEC_DIR_OUTBOUND,
dffa46cd
JH
2049 IP_FORWARDING,
2050 &ipsecerror);
984263bc
MD
2051
2052 if (sp == NULL)
6164b468 2053 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2054 else {
2055 /* count IPsec header size */
2056 ipsechdr = ipsec4_hdrsiz(mcopy,
2057 IPSEC_DIR_OUTBOUND,
2058 NULL);
2059
2060 /*
2061 * find the correct route for outer IPv4
2062 * header, compute tunnel MTU.
984263bc 2063 */
981773b8 2064
012d77ea
JH
2065 if (sp->req != NULL &&
2066 sp->req->sav != NULL &&
2067 sp->req->sav->sah != NULL) {
984263bc 2068 ro = &sp->req->sav->sah->sa_route;
012d77ea
JH
2069 if (ro->ro_rt != NULL &&
2070 ro->ro_rt->rt_ifp != NULL) {
981773b8 2071 destmtu =
984263bc 2072 ro->ro_rt->rt_ifp->if_mtu;
981773b8 2073 destmtu -= ipsechdr;
984263bc
MD
2074 }
2075 }
2076
2077 KEY_FREESP(&sp);
2078 }
2079 }
2080#else /* !IPSEC && !FAST_IPSEC */
6164b468
MD
2081 if (fwd_ro.ro_rt != NULL)
2082 destmtu = fwd_ro.ro_rt->rt_ifp->if_mtu;
984263bc
MD
2083#endif /*IPSEC*/
2084 ipstat.ips_cantfrag++;
2085 break;
2086
2087 case ENOBUFS:
2088 /*
2089 * A router should not generate ICMP_SOURCEQUENCH as
2090 * required in RFC1812 Requirements for IP Version 4 Routers.
2091 * Source quench could be a big problem under DoS attacks,
2092 * or if the underlying interface is rate-limited.
2093 * Those who need source quench packets may re-enable them
2094 * via the net.inet.ip.sendsourcequench sysctl.
2095 */
dffa46cd 2096 if (!ip_sendsourcequench) {
984263bc 2097 m_freem(mcopy);
984322d1 2098 goto done;
984263bc
MD
2099 } else {
2100 type = ICMP_SOURCEQUENCH;
2101 code = 0;
2102 }
2103 break;
2104
2105 case EACCES: /* ipfw denied packet */
2106 m_freem(mcopy);
984322d1 2107 goto done;
984263bc 2108 }
981773b8 2109 icmp_error(mcopy, type, code, dest, destmtu);
984322d1 2110done:
6164b468
MD
2111 if (fwd_ro.ro_rt != NULL)
2112 RTFREE(fwd_ro.ro_rt);
984263bc
MD
2113}
2114
2115void
dffa46cd
JH
2116ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
2117 struct mbuf *m)
984263bc
MD
2118{
2119 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
2120 struct timeval tv;
2121
2122 microtime(&tv);
2123 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
dffa46cd 2124 SCM_TIMESTAMP, SOL_SOCKET);
984263bc
MD
2125 if (*mp)
2126 mp = &(*mp)->m_next;
2127 }
2128 if (inp->inp_flags & INP_RECVDSTADDR) {
2129 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
2130 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
2131 if (*mp)
2132 mp = &(*mp)->m_next;
2133 }
95926362
MD
2134 if (inp->inp_flags & INP_RECVTTL) {
2135 *mp = sbcreatecontrol((caddr_t) &ip->ip_ttl,
2136 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
2137 if (*mp)
2138 mp = &(*mp)->m_next;
2139 }
984263bc
MD
2140#ifdef notyet
2141 /* XXX
2142 * Moving these out of udp_input() made them even more broken
2143 * than they already were.
2144 */
2145 /* options were tossed already */
2146 if (inp->inp_flags & INP_RECVOPTS) {
2147 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
2148 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
2149 if (*mp)
2150 mp = &(*mp)->m_next;
2151 }
2152 /* ip_srcroute doesn't do what we want here, need to fix */
2153 if (inp->inp_flags & INP_RECVRETOPTS) {
7e31206a 2154 *mp = sbcreatecontrol((caddr_t) ip_srcroute(m),
984263bc
MD
2155 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
2156 if (*mp)
2157 mp = &(*mp)->m_next;
2158 }
2159#endif
2160 if (inp->inp_flags & INP_RECVIF) {
2161 struct ifnet *ifp;
2162 struct sdlbuf {
2163 struct sockaddr_dl sdl;
2164 u_char pad[32];
2165 } sdlbuf;
2166 struct sockaddr_dl *sdp;
2167 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
2168
dffa46cd
JH
2169 if (((ifp = m->m_pkthdr.rcvif)) &&
2170 ((ifp->if_index != 0) && (ifp->if_index <= if_index))) {
f2682cb9 2171 sdp = IF_LLSOCKADDR(ifp);
984263bc
MD
2172 /*
2173 * Change our mind and don't try copy.
2174 */
dffa46cd
JH
2175 if ((sdp->sdl_family != AF_LINK) ||
2176 (sdp->sdl_len > sizeof(sdlbuf))) {
984263bc
MD
2177 goto makedummy;
2178 }
2179 bcopy(sdp, sdl2, sdp->sdl_len);
2180 } else {
dffa46cd
JH
2181makedummy:
2182 sdl2->sdl_len =
2183 offsetof(struct sockaddr_dl, sdl_data[0]);
984263bc
MD
2184 sdl2->sdl_family = AF_LINK;
2185 sdl2->sdl_index = 0;
2186 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
2187 }
2188 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
2189 IP_RECVIF, IPPROTO_IP);
2190 if (*mp)
2191 mp = &(*mp)->m_next;
2192 }
2193}
2194
2195/*
2196 * XXX these routines are called from the upper part of the kernel.
2197 *
2198 * They could also be moved to ip_mroute.c, since all the RSVP
2199 * handling is done there already.
2200 */
2201int
2202ip_rsvp_init(struct socket *so)
2203{
2204 if (so->so_type != SOCK_RAW ||
2205 so->so_proto->pr_protocol != IPPROTO_RSVP)
2206 return EOPNOTSUPP;
2207
2208 if (ip_rsvpd != NULL)
2209 return EADDRINUSE;
2210
2211 ip_rsvpd = so;
2212 /*
2213 * This may seem silly, but we need to be sure we don't over-increment
2214 * the RSVP counter, in case something slips up.
2215 */
2216 if (!ip_rsvp_on) {
2217 ip_rsvp_on = 1;
2218 rsvp_on++;
2219 }
2220
2221 return 0;
2222}
2223
2224int
2225ip_rsvp_done(void)
2226{
2227 ip_rsvpd = NULL;
2228 /*
2229 * This may seem silly, but we need to be sure we don't over-decrement
2230 * the RSVP counter, in case something slips up.
2231 */
2232 if (ip_rsvp_on) {
2233 ip_rsvp_on = 0;
2234 rsvp_on--;
2235 }
2236 return 0;
2237}
2238
002c1265
MD
2239int
2240rsvp_input(struct mbuf **mp, int *offp, int proto)
984263bc 2241{
002c1265
MD
2242 struct mbuf *m = *mp;
2243 int off;
a00138cb 2244
002c1265
MD
2245 off = *offp;
2246 *mp = NULL;
a00138cb 2247
984263bc 2248 if (rsvp_input_p) { /* call the real one if loaded */
002c1265
MD
2249 *mp = m;
2250 rsvp_input_p(mp, offp, proto);
2251 return(IPPROTO_DONE);
984263bc
MD
2252 }
2253
2254 /* Can still get packets with rsvp_on = 0 if there is a local member
2255 * of the group to which the RSVP packet is addressed. But in this
2256 * case we want to throw the packet away.
2257 */
2258
2259 if (!rsvp_on) {
2260 m_freem(m);
002c1265 2261 return(IPPROTO_DONE);
984263bc
MD
2262 }
2263
dffa46cd 2264 if (ip_rsvpd != NULL) {
002c1265
MD
2265 *mp = m;
2266 rip_input(mp, offp, proto);
2267 return(IPPROTO_DONE);
984263bc
MD
2268 }
2269 /* Drop the packet */
2270 m_freem(m);
002c1265 2271 return(IPPROTO_DONE);
984263bc 2272}