2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved.
3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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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,
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26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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35 * Copyright (c) 1982, 1986, 1988, 1993
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39 * modification, are permitted provided that the following conditions
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59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
63 * $FreeBSD: src/sys/netinet/ip_input.c,v 1.130.2.52 2003/03/07 07:01:28 silby Exp $
68 #include "opt_bootp.h"
70 #include "opt_ipdivert.h"
71 #include "opt_ipstealth.h"
72 #include "opt_ipsec.h"
75 #include <sys/param.h>
76 #include <sys/systm.h>
78 #include <sys/malloc.h>
79 #include <sys/mpipe.h>
80 #include <sys/domain.h>
81 #include <sys/protosw.h>
82 #include <sys/socket.h>
84 #include <sys/globaldata.h>
85 #include <sys/thread.h>
86 #include <sys/kernel.h>
87 #include <sys/syslog.h>
88 #include <sys/sysctl.h>
89 #include <sys/in_cksum.h>
92 #include <sys/mplock2.h>
94 #include <machine/stdarg.h>
97 #include <net/if_types.h>
98 #include <net/if_var.h>
99 #include <net/if_dl.h>
100 #include <net/pfil.h>
101 #include <net/route.h>
102 #include <net/netisr2.h>
104 #include <netinet/in.h>
105 #include <netinet/in_systm.h>
106 #include <netinet/in_var.h>
107 #include <netinet/ip.h>
108 #include <netinet/in_pcb.h>
109 #include <netinet/ip_var.h>
110 #include <netinet/ip_icmp.h>
111 #include <netinet/ip_divert.h>
112 #include <netinet/ip_flow.h>
114 #include <sys/thread2.h>
115 #include <sys/msgport2.h>
116 #include <net/netmsg2.h>
118 #include <sys/socketvar.h>
120 #include <net/ipfw/ip_fw.h>
121 #include <net/dummynet/ip_dummynet.h>
124 #include <netinet6/ipsec.h>
125 #include <netproto/key/key.h>
129 #include <netproto/ipsec/ipsec.h>
130 #include <netproto/ipsec/key.h>
134 static int ip_rsvp_on
;
135 struct socket
*ip_rsvpd
;
137 int ipforwarding
= 0;
138 SYSCTL_INT(_net_inet_ip
, IPCTL_FORWARDING
, forwarding
, CTLFLAG_RW
,
139 &ipforwarding
, 0, "Enable IP forwarding between interfaces");
141 static int ipsendredirects
= 1; /* XXX */
142 SYSCTL_INT(_net_inet_ip
, IPCTL_SENDREDIRECTS
, redirect
, CTLFLAG_RW
,
143 &ipsendredirects
, 0, "Enable sending IP redirects");
145 int ip_defttl
= IPDEFTTL
;
146 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFTTL
, ttl
, CTLFLAG_RW
,
147 &ip_defttl
, 0, "Maximum TTL on IP packets");
149 static int ip_dosourceroute
= 0;
150 SYSCTL_INT(_net_inet_ip
, IPCTL_SOURCEROUTE
, sourceroute
, CTLFLAG_RW
,
151 &ip_dosourceroute
, 0, "Enable forwarding source routed IP packets");
153 static int ip_acceptsourceroute
= 0;
154 SYSCTL_INT(_net_inet_ip
, IPCTL_ACCEPTSOURCEROUTE
, accept_sourceroute
,
155 CTLFLAG_RW
, &ip_acceptsourceroute
, 0,
156 "Enable accepting source routed IP packets");
159 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragpackets
, CTLFLAG_RW
,
161 "Maximum number of IPv4 fragment reassembly queue entries");
163 static int maxfragsperpacket
;
164 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragsperpacket
, CTLFLAG_RW
,
165 &maxfragsperpacket
, 0,
166 "Maximum number of IPv4 fragments allowed per packet");
168 static int ip_sendsourcequench
= 0;
169 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, sendsourcequench
, CTLFLAG_RW
,
170 &ip_sendsourcequench
, 0,
171 "Enable the transmission of source quench packets");
173 int ip_do_randomid
= 1;
174 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, random_id
, CTLFLAG_RW
,
176 "Assign random ip_id values");
178 * XXX - Setting ip_checkinterface mostly implements the receive side of
179 * the Strong ES model described in RFC 1122, but since the routing table
180 * and transmit implementation do not implement the Strong ES model,
181 * setting this to 1 results in an odd hybrid.
183 * XXX - ip_checkinterface currently must be disabled if you use ipnat
184 * to translate the destination address to another local interface.
186 * XXX - ip_checkinterface must be disabled if you add IP aliases
187 * to the loopback interface instead of the interface where the
188 * packets for those addresses are received.
190 static int ip_checkinterface
= 0;
191 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, check_interface
, CTLFLAG_RW
,
192 &ip_checkinterface
, 0, "Verify packet arrives on correct interface");
194 static u_long ip_hash_count
= 0;
195 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, hash_count
, CTLFLAG_RD
,
196 &ip_hash_count
, 0, "Number of packets hashed by IP");
199 static u_long ip_rehash_count
= 0;
200 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, rehash_count
, CTLFLAG_RD
,
201 &ip_rehash_count
, 0, "Number of packets rehashed by IP");
203 static u_long ip_dispatch_fast
= 0;
204 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_fast_count
, CTLFLAG_RD
,
205 &ip_dispatch_fast
, 0, "Number of packets handled on current CPU");
207 static u_long ip_dispatch_slow
= 0;
208 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_slow_count
, CTLFLAG_RD
,
209 &ip_dispatch_slow
, 0, "Number of packets messaged to another CPU");
213 static int ipprintfs
= 0;
216 extern struct domain inetdomain
;
217 extern struct protosw inetsw
[];
218 u_char ip_protox
[IPPROTO_MAX
];
219 struct in_ifaddrhead in_ifaddrheads
[MAXCPU
]; /* first inet address */
220 struct in_ifaddrhashhead
*in_ifaddrhashtbls
[MAXCPU
];
221 /* inet addr hash table */
222 u_long in_ifaddrhmask
; /* mask for hash table */
224 static struct mbuf
*ipforward_mtemp
[MAXCPU
];
226 struct ip_stats ipstats_percpu
[MAXCPU
] __cachealign
;
229 sysctl_ipstats(SYSCTL_HANDLER_ARGS
)
233 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
234 if ((error
= SYSCTL_OUT(req
, &ipstats_percpu
[cpu
],
235 sizeof(struct ip_stats
))))
237 if ((error
= SYSCTL_IN(req
, &ipstats_percpu
[cpu
],
238 sizeof(struct ip_stats
))))
244 SYSCTL_PROC(_net_inet_ip
, IPCTL_STATS
, stats
, (CTLTYPE_OPAQUE
| CTLFLAG_RW
),
245 0, 0, sysctl_ipstats
, "S,ip_stats", "IP statistics");
247 /* Packet reassembly stuff */
248 #define IPREASS_NHASH_LOG2 6
249 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
250 #define IPREASS_HMASK (IPREASS_NHASH - 1)
251 #define IPREASS_HASH(x,y) \
252 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
254 TAILQ_HEAD(ipqhead
, ipq
);
255 struct ipfrag_queue
{
257 volatile int draining
;
258 struct netmsg_base timeo_netmsg
;
259 struct callout timeo_ch
;
260 struct netmsg_base drain_netmsg
;
261 struct ipqhead ipq
[IPREASS_NHASH
];
264 static struct ipfrag_queue ipfrag_queue_pcpu
[MAXCPU
];
267 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFMTU
, mtu
, CTLFLAG_RW
,
268 &ip_mtu
, 0, "Default MTU");
272 static int ipstealth
= 0;
273 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, stealth
, CTLFLAG_RW
, &ipstealth
, 0, "");
275 static const int ipstealth
= 0;
278 struct mbuf
*(*ip_divert_p
)(struct mbuf
*, int, int);
280 struct pfil_head inet_pfil_hook
;
283 * struct ip_srcrt_opt is used to store packet state while it travels
286 * XXX Note that the code even makes assumptions on the size and
287 * alignment of fields inside struct ip_srcrt so e.g. adding some
288 * fields will break the code. This needs to be fixed.
290 * We need to save the IP options in case a protocol wants to respond
291 * to an incoming packet over the same route if the packet got here
292 * using IP source routing. This allows connection establishment and
293 * maintenance when the remote end is on a network that is not known
297 struct in_addr dst
; /* final destination */
298 char nop
; /* one NOP to align */
299 char srcopt
[IPOPT_OFFSET
+ 1]; /* OPTVAL, OLEN and OFFSET */
300 struct in_addr route
[MAX_IPOPTLEN
/sizeof(struct in_addr
)];
303 struct ip_srcrt_opt
{
305 struct ip_srcrt ip_srcrt
;
308 #define IPFRAG_MPIPE_MAX 4096
309 #define MAXIPFRAG_MIN ((IPFRAG_MPIPE_MAX * 2) / 256)
311 #define IPFRAG_TIMEO (hz / PR_SLOWHZ)
313 static MALLOC_DEFINE(M_IPQ
, "ipq", "IP Fragment Management");
314 static struct malloc_pipe ipq_mpipe
;
316 static void save_rte(struct mbuf
*, u_char
*, struct in_addr
);
317 static int ip_dooptions(struct mbuf
*m
, int, struct sockaddr_in
*);
318 static void ip_freef(struct ipfrag_queue
*, struct ipqhead
*,
320 static void ip_input_handler(netmsg_t
);
322 static void ipfrag_timeo_dispatch(netmsg_t
);
323 static void ipfrag_timeo(void *);
324 static void ipfrag_drain_dispatch(netmsg_t
);
327 * IP initialization: fill in IP protocol switch table.
328 * All protocols not implemented in kernel go to raw IP protocol handler.
333 struct ipfrag_queue
*fragq
;
338 * Make sure we can handle a reasonable number of fragments but
339 * cap it at IPFRAG_MPIPE_MAX.
341 mpipe_init(&ipq_mpipe
, M_IPQ
, sizeof(struct ipq
),
342 IFQ_MAXLEN
, IPFRAG_MPIPE_MAX
, 0, NULL
, NULL
, NULL
);
345 * Make in_ifaddrhead and in_ifaddrhashtbl available on all CPUs,
346 * since they could be accessed by any threads.
348 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
349 TAILQ_INIT(&in_ifaddrheads
[cpu
]);
350 in_ifaddrhashtbls
[cpu
] =
351 hashinit(INADDR_NHASH
, M_IFADDR
, &in_ifaddrhmask
);
354 pr
= pffindproto(PF_INET
, IPPROTO_RAW
, SOCK_RAW
);
357 for (i
= 0; i
< IPPROTO_MAX
; i
++)
358 ip_protox
[i
] = pr
- inetsw
;
359 for (pr
= inetdomain
.dom_protosw
;
360 pr
< inetdomain
.dom_protoswNPROTOSW
; pr
++) {
361 if (pr
->pr_domain
->dom_family
== PF_INET
&& pr
->pr_protocol
) {
362 if (pr
->pr_protocol
!= IPPROTO_RAW
)
363 ip_protox
[pr
->pr_protocol
] = pr
- inetsw
;
367 inet_pfil_hook
.ph_type
= PFIL_TYPE_AF
;
368 inet_pfil_hook
.ph_af
= AF_INET
;
369 if ((i
= pfil_head_register(&inet_pfil_hook
)) != 0) {
370 kprintf("%s: WARNING: unable to register pfil hook, "
371 "error %d\n", __func__
, i
);
374 maxnipq
= (nmbclusters
/ 32) / netisr_ncpus
;
375 if (maxnipq
< MAXIPFRAG_MIN
)
376 maxnipq
= MAXIPFRAG_MIN
;
377 maxfragsperpacket
= 16;
379 ip_id
= time_second
& 0xffff; /* time_second survives reboots */
381 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
383 * Initialize IP statistics counters for each CPU.
385 bzero(&ipstats_percpu
[cpu
], sizeof(struct ip_stats
));
388 * Preallocate mbuf template for forwarding
390 MGETHDR(ipforward_mtemp
[cpu
], M_WAITOK
, MT_DATA
);
393 * Initialize per-cpu ip fragments queues
395 fragq
= &ipfrag_queue_pcpu
[cpu
];
396 for (i
= 0; i
< IPREASS_NHASH
; i
++)
397 TAILQ_INIT(&fragq
->ipq
[i
]);
399 callout_init_mp(&fragq
->timeo_ch
);
400 netmsg_init(&fragq
->timeo_netmsg
, NULL
, &netisr_adone_rport
,
401 MSGF_PRIORITY
, ipfrag_timeo_dispatch
);
402 netmsg_init(&fragq
->drain_netmsg
, NULL
, &netisr_adone_rport
,
403 MSGF_PRIORITY
, ipfrag_drain_dispatch
);
406 netisr_register(NETISR_IP
, ip_input_handler
, ip_hashfn
);
407 netisr_register_hashcheck(NETISR_IP
, ip_hashcheck
);
409 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
410 fragq
= &ipfrag_queue_pcpu
[cpu
];
411 callout_reset_bycpu(&fragq
->timeo_ch
, IPFRAG_TIMEO
,
412 ipfrag_timeo
, NULL
, cpu
);
415 ip_porthash_trycount
= 2 * netisr_ncpus
;
418 /* Do transport protocol processing. */
420 transport_processing_oncpu(struct mbuf
*m
, int hlen
, struct ip
*ip
)
422 const struct protosw
*pr
= &inetsw
[ip_protox
[ip
->ip_p
]];
425 * Switch out to protocol's input routine.
428 pr
->pr_input(&m
, &hlen
, ip
->ip_p
);
433 transport_processing_handler(netmsg_t msg
)
435 struct netmsg_packet
*pmsg
= &msg
->packet
;
439 ip
= mtod(pmsg
->nm_packet
, struct ip
*);
440 hlen
= pmsg
->base
.lmsg
.u
.ms_result
;
442 transport_processing_oncpu(pmsg
->nm_packet
, hlen
, ip
);
443 /* msg was embedded in the mbuf, do not reply! */
447 ip_input_handler(netmsg_t msg
)
449 ip_input(msg
->packet
.nm_packet
);
450 /* msg was embedded in the mbuf, do not reply! */
454 * IP input routine. Checksum and byte swap header. If fragmented
455 * try to reassemble. Process options. Pass to next level.
458 ip_input(struct mbuf
*m
)
461 struct in_ifaddr
*ia
= NULL
;
462 struct in_ifaddr_container
*iac
;
465 struct in_addr pkt_dst
;
466 boolean_t using_srcrt
= FALSE
; /* forward (by PFIL_HOOKS) */
467 struct in_addr odst
; /* original dst address(NAT) */
469 struct sockaddr_in
*next_hop
= NULL
;
472 struct tdb_ident
*tdbi
;
473 struct secpolicy
*sp
;
477 ASSERT_NETISR_NCPUS(mycpuid
);
480 /* length checks already done in ip_hashfn() */
481 KASSERT(m
->m_len
>= sizeof(struct ip
), ("IP header not in one mbuf"));
484 * This routine is called from numerous places which may not have
485 * characterized the packet.
487 ip
= mtod(m
, struct ip
*);
488 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
)) ||
489 (ntohs(ip
->ip_off
) & (IP_MF
| IP_OFFMASK
))) {
491 * Force hash recalculation for fragments and multicast
492 * packets; hardware may not do it correctly.
493 * XXX add flag to indicate the hash is from hardware
495 m
->m_flags
&= ~M_HASH
;
497 if ((m
->m_flags
& M_HASH
) == 0) {
501 KKASSERT(m
->m_flags
& M_HASH
);
503 if (&curthread
->td_msgport
!=
504 netisr_hashport(m
->m_pkthdr
.hash
)) {
505 netisr_queue(NETISR_IP
, m
);
506 /* Requeued to other netisr msgport; done */
510 /* mbuf could have been changed */
511 ip
= mtod(m
, struct ip
*);
515 * Pull out certain tags
517 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
519 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
520 KKASSERT(mtag
!= NULL
);
521 next_hop
= m_tag_data(mtag
);
524 if (m
->m_pkthdr
.fw_flags
&
525 (DUMMYNET_MBUF_TAGGED
| IPFW_MBUF_CONTINUE
)) {
527 * - Dummynet already filtered this packet.
528 * - This packet was processed by ipfw on another
529 * cpu, and the rest of the ipfw processing should
530 * be carried out on this cpu.
532 ip
= mtod(m
, struct ip
*);
533 ip
->ip_len
= ntohs(ip
->ip_len
);
534 ip
->ip_off
= ntohs(ip
->ip_off
);
535 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
541 if (IP_VHL_V(ip
->ip_vhl
) != IPVERSION
) {
542 ipstat
.ips_badvers
++;
546 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
547 /* length checks already done in ip_hashfn() */
548 KASSERT(hlen
>= sizeof(struct ip
), ("IP header len too small"));
549 KASSERT(m
->m_len
>= hlen
, ("complete IP header not in one mbuf"));
551 /* 127/8 must not appear on wire - RFC1122 */
552 if ((ntohl(ip
->ip_dst
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
||
553 (ntohl(ip
->ip_src
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
) {
554 if (!(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
)) {
555 ipstat
.ips_badaddr
++;
560 if (m
->m_pkthdr
.csum_flags
& CSUM_IP_CHECKED
) {
561 sum
= !(m
->m_pkthdr
.csum_flags
& CSUM_IP_VALID
);
563 if (hlen
== sizeof(struct ip
))
564 sum
= in_cksum_hdr(ip
);
566 sum
= in_cksum(m
, hlen
);
574 if (altq_input
!= NULL
&& (*altq_input
)(m
, AF_INET
) == 0) {
575 /* packet is dropped by traffic conditioner */
580 * Convert fields to host representation.
582 ip
->ip_len
= ntohs(ip
->ip_len
);
583 ip
->ip_off
= ntohs(ip
->ip_off
);
585 /* length checks already done in ip_hashfn() */
586 KASSERT(ip
->ip_len
>= hlen
, ("total length less then header length"));
587 KASSERT(m
->m_pkthdr
.len
>= ip
->ip_len
, ("mbuf too short"));
590 * Trim mbufs if longer than the IP header would have us expect.
592 if (m
->m_pkthdr
.len
> ip
->ip_len
) {
593 if (m
->m_len
== m
->m_pkthdr
.len
) {
594 m
->m_len
= ip
->ip_len
;
595 m
->m_pkthdr
.len
= ip
->ip_len
;
597 m_adj(m
, ip
->ip_len
- m
->m_pkthdr
.len
);
600 #if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
602 * Bypass packet filtering for packets from a tunnel (gif).
604 if (ipsec_gethist(m
, NULL
))
610 * Right now when no processing on packet has done
611 * and it is still fresh out of network we do our black
613 * - Firewall: deny/allow/divert
614 * - Xlate: translate packet's addr/port (NAT).
615 * - Pipe: pass pkt through dummynet.
616 * - Wrap: fake packet's addr/port <unimpl.>
617 * - Encapsulate: put it in another IP and send out. <unimp.>
622 * If we've been forwarded from the output side, then
623 * skip the firewall a second time
625 if (next_hop
!= NULL
)
629 if (!pfil_has_hooks(&inet_pfil_hook
)) {
630 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
632 * Strip dummynet tags from stranded packets
634 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
635 KKASSERT(mtag
!= NULL
);
636 m_tag_delete(m
, mtag
);
637 m
->m_pkthdr
.fw_flags
&= ~DUMMYNET_MBUF_TAGGED
;
643 * Run through list of hooks for input packets.
645 * NOTE! If the packet is rewritten pf/ipfw/whoever must
649 if (pfil_run_hooks(&inet_pfil_hook
, &m
, m
->m_pkthdr
.rcvif
, PFIL_IN
))
651 if (m
== NULL
) /* consumed by filter */
653 ip
= mtod(m
, struct ip
*);
654 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
655 using_srcrt
= (odst
.s_addr
!= ip
->ip_dst
.s_addr
);
657 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
658 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
659 KKASSERT(mtag
!= NULL
);
660 next_hop
= m_tag_data(mtag
);
662 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
666 if (m
->m_pkthdr
.fw_flags
& FW_MBUF_REDISPATCH
)
667 m
->m_pkthdr
.fw_flags
&= ~FW_MBUF_REDISPATCH
;
668 if (m
->m_pkthdr
.fw_flags
& IPFW_MBUF_CONTINUE
) {
669 /* ipfw was disabled/unloaded. */
674 * Process options and, if not destined for us,
675 * ship it on. ip_dooptions returns 1 when an
676 * error was detected (causing an icmp message
677 * to be sent and the original packet to be freed).
679 if (hlen
> sizeof(struct ip
) && ip_dooptions(m
, 0, next_hop
))
682 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
683 * matter if it is destined to another node, or whether it is
684 * a multicast one, RSVP wants it! and prevents it from being forwarded
685 * anywhere else. Also checks if the rsvp daemon is running before
686 * grabbing the packet.
688 if (rsvp_on
&& ip
->ip_p
== IPPROTO_RSVP
)
692 * Check our list of addresses, to see if the packet is for us.
693 * If we don't have any addresses, assume any unicast packet
694 * we receive might be for us (and let the upper layers deal
697 if (TAILQ_EMPTY(&in_ifaddrheads
[mycpuid
]) &&
698 !(m
->m_flags
& (M_MCAST
| M_BCAST
)))
702 * Cache the destination address of the packet; this may be
703 * changed by use of 'ipfw fwd'.
705 pkt_dst
= next_hop
? next_hop
->sin_addr
: ip
->ip_dst
;
708 * Enable a consistency check between the destination address
709 * and the arrival interface for a unicast packet (the RFC 1122
710 * strong ES model) if IP forwarding is disabled and the packet
711 * is not locally generated and the packet is not subject to
714 * XXX - Checking also should be disabled if the destination
715 * address is ipnat'ed to a different interface.
717 * XXX - Checking is incompatible with IP aliases added
718 * to the loopback interface instead of the interface where
719 * the packets are received.
721 checkif
= ip_checkinterface
&&
723 m
->m_pkthdr
.rcvif
!= NULL
&&
724 !(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
) &&
728 * Check for exact addresses in the hash bucket.
730 LIST_FOREACH(iac
, INADDR_HASH(pkt_dst
.s_addr
), ia_hash
) {
734 * If the address matches, verify that the packet
735 * arrived via the correct interface if checking is
738 if (IA_SIN(ia
)->sin_addr
.s_addr
== pkt_dst
.s_addr
&&
739 (!checkif
|| ia
->ia_ifp
== m
->m_pkthdr
.rcvif
))
745 * Check for broadcast addresses.
747 * Only accept broadcast packets that arrive via the matching
748 * interface. Reception of forwarded directed broadcasts would
749 * be handled via ip_forward() and ether_output() with the loopback
750 * into the stack for SIMPLEX interfaces handled by ether_output().
752 if (m
->m_pkthdr
.rcvif
!= NULL
&&
753 m
->m_pkthdr
.rcvif
->if_flags
& IFF_BROADCAST
) {
754 struct ifaddr_container
*ifac
;
756 TAILQ_FOREACH(ifac
, &m
->m_pkthdr
.rcvif
->if_addrheads
[mycpuid
],
758 struct ifaddr
*ifa
= ifac
->ifa
;
760 if (ifa
->ifa_addr
== NULL
) /* shutdown/startup race */
762 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
765 if (satosin(&ia
->ia_broadaddr
)->sin_addr
.s_addr
==
768 if (ia
->ia_netbroadcast
.s_addr
== pkt_dst
.s_addr
)
771 if (IA_SIN(ia
)->sin_addr
.s_addr
== INADDR_ANY
)
776 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
))) {
777 struct in_multi
*inm
;
779 if (ip_mrouter
!= NULL
) {
780 /* XXX Multicast routing is not MPSAFE yet */
784 * If we are acting as a multicast router, all
785 * incoming multicast packets are passed to the
786 * kernel-level multicast forwarding function.
787 * The packet is returned (relatively) intact; if
788 * ip_mforward() returns a non-zero value, the packet
789 * must be discarded, else it may be accepted below.
791 if (ip_mforward
!= NULL
&&
792 ip_mforward(ip
, m
->m_pkthdr
.rcvif
, m
, NULL
) != 0) {
794 ipstat
.ips_cantforward
++;
802 * The process-level routing daemon needs to receive
803 * all multicast IGMP packets, whether or not this
804 * host belongs to their destination groups.
806 if (ip
->ip_p
== IPPROTO_IGMP
)
808 ipstat
.ips_forward
++;
811 * See if we belong to the destination multicast group on the
814 inm
= IN_LOOKUP_MULTI(&ip
->ip_dst
, m
->m_pkthdr
.rcvif
);
816 ipstat
.ips_notmember
++;
822 if (ip
->ip_dst
.s_addr
== INADDR_BROADCAST
)
824 if (ip
->ip_dst
.s_addr
== INADDR_ANY
)
828 * Not for us; forward if possible and desirable.
831 ipstat
.ips_cantforward
++;
836 * Enforce inbound IPsec SPD.
838 if (ipsec4_in_reject(m
, NULL
)) {
839 ipsecstat
.in_polvio
++;
844 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
847 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
848 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
850 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
851 IP_FORWARDING
, &error
);
853 if (sp
== NULL
) { /* NB: can happen if error */
855 /*XXX error stat???*/
856 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
861 * Check security policy against packet attributes.
863 error
= ipsec_in_reject(sp
, m
);
867 ipstat
.ips_cantforward
++;
871 ip_forward(m
, using_srcrt
, next_hop
);
878 * IPSTEALTH: Process non-routing options only
879 * if the packet is destined for us.
882 hlen
> sizeof(struct ip
) &&
883 ip_dooptions(m
, 1, next_hop
))
886 /* Count the packet in the ip address stats */
888 IFA_STAT_INC(&ia
->ia_ifa
, ipackets
, 1);
889 IFA_STAT_INC(&ia
->ia_ifa
, ibytes
, m
->m_pkthdr
.len
);
893 * If offset or IP_MF are set, must reassemble.
894 * Otherwise, nothing need be done.
895 * (We could look in the reassembly queue to see
896 * if the packet was previously fragmented,
897 * but it's not worth the time; just let them time out.)
899 if (ip
->ip_off
& (IP_MF
| IP_OFFMASK
)) {
901 * Attempt reassembly; if it succeeds, proceed. ip_reass()
902 * will return a different mbuf.
904 * NOTE: ip_reass() returns m with M_HASH cleared to force
905 * us to recharacterize the packet.
910 ip
= mtod(m
, struct ip
*);
912 /* Get the header length of the reassembled packet */
913 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
920 * enforce IPsec policy checking if we are seeing last header.
921 * note that we do not visit this with protocols with pcb layer
922 * code - like udp/tcp/raw ip.
924 if ((inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) &&
925 ipsec4_in_reject(m
, NULL
)) {
926 ipsecstat
.in_polvio
++;
932 * enforce IPsec policy checking if we are seeing last header.
933 * note that we do not visit this with protocols with pcb layer
934 * code - like udp/tcp/raw ip.
936 if (inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) {
938 * Check if the packet has already had IPsec processing
939 * done. If so, then just pass it along. This tag gets
940 * set during AH, ESP, etc. input handling, before the
941 * packet is returned to the ip input queue for delivery.
943 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
946 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
947 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
949 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
950 IP_FORWARDING
, &error
);
954 * Check security policy against packet attributes.
956 error
= ipsec_in_reject(sp
, m
);
959 /* XXX error stat??? */
961 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
969 #endif /* FAST_IPSEC */
972 * We must forward the packet to the correct protocol thread if
973 * we are not already in it.
975 * NOTE: ip_len is now in host form. ip_len is not adjusted
976 * further for protocol processing, instead we pass hlen
977 * to the protosw and let it deal with it.
979 ipstat
.ips_delivered
++;
981 if ((m
->m_flags
& M_HASH
) == 0) {
983 atomic_add_long(&ip_rehash_count
, 1);
985 ip
->ip_len
= htons(ip
->ip_len
+ hlen
);
986 ip
->ip_off
= htons(ip
->ip_off
);
992 ip
= mtod(m
, struct ip
*);
993 ip
->ip_len
= ntohs(ip
->ip_len
) - hlen
;
994 ip
->ip_off
= ntohs(ip
->ip_off
);
995 KKASSERT(m
->m_flags
& M_HASH
);
997 port
= netisr_hashport(m
->m_pkthdr
.hash
);
999 if (port
!= &curthread
->td_msgport
) {
1000 struct netmsg_packet
*pmsg
;
1003 atomic_add_long(&ip_dispatch_slow
, 1);
1006 pmsg
= &m
->m_hdr
.mh_netmsg
;
1007 netmsg_init(&pmsg
->base
, NULL
, &netisr_apanic_rport
,
1008 0, transport_processing_handler
);
1009 pmsg
->nm_packet
= m
;
1010 pmsg
->base
.lmsg
.u
.ms_result
= hlen
;
1011 lwkt_sendmsg(port
, &pmsg
->base
.lmsg
);
1014 atomic_add_long(&ip_dispatch_fast
, 1);
1016 transport_processing_oncpu(m
, hlen
, ip
);
1025 * Take incoming datagram fragment and try to reassemble it into
1026 * whole datagram. If a chain for reassembly of this datagram already
1027 * exists, then it is given as fp; otherwise have to make a chain.
1030 ip_reass(struct mbuf
*m
)
1032 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1033 struct ip
*ip
= mtod(m
, struct ip
*);
1034 struct mbuf
*p
= NULL
, *q
, *nq
;
1036 struct ipq
*fp
= NULL
;
1037 struct ipqhead
*head
;
1038 int hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
1042 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
1043 if (maxnipq
== 0 || maxfragsperpacket
== 0) {
1044 ipstat
.ips_fragments
++;
1045 ipstat
.ips_fragdropped
++;
1050 sum
= IPREASS_HASH(ip
->ip_src
.s_addr
, ip
->ip_id
);
1052 * Look for queue of fragments of this datagram.
1054 head
= &fragq
->ipq
[sum
];
1055 TAILQ_FOREACH(fp
, head
, ipq_list
) {
1056 if (ip
->ip_id
== fp
->ipq_id
&&
1057 ip
->ip_src
.s_addr
== fp
->ipq_src
.s_addr
&&
1058 ip
->ip_dst
.s_addr
== fp
->ipq_dst
.s_addr
&&
1059 ip
->ip_p
== fp
->ipq_p
)
1066 * Enforce upper bound on number of fragmented packets
1067 * for which we attempt reassembly;
1068 * If maxnipq is -1, accept all fragments without limitation.
1070 if (fragq
->nipq
> maxnipq
&& maxnipq
> 0) {
1072 * drop something from the tail of the current queue
1073 * before proceeding further
1075 struct ipq
*q
= TAILQ_LAST(head
, ipqhead
);
1078 * The current queue is empty,
1079 * so drop from one of the others.
1081 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1082 struct ipq
*r
= TAILQ_LAST(&fragq
->ipq
[i
],
1085 ipstat
.ips_fragtimeout
+= r
->ipq_nfrags
;
1086 ip_freef(fragq
, &fragq
->ipq
[i
], r
);
1091 ipstat
.ips_fragtimeout
+= q
->ipq_nfrags
;
1092 ip_freef(fragq
, head
, q
);
1097 * Adjust ip_len to not reflect header,
1098 * convert offset of this to bytes.
1101 if (ip
->ip_off
& IP_MF
) {
1103 * Make sure that fragments have a data length
1104 * that's a non-zero multiple of 8 bytes.
1106 if (ip
->ip_len
== 0 || (ip
->ip_len
& 0x7) != 0) {
1107 ipstat
.ips_toosmall
++; /* XXX */
1111 m
->m_flags
|= M_FRAG
;
1113 m
->m_flags
&= ~M_FRAG
;
1117 ipstat
.ips_fragments
++;
1118 m
->m_pkthdr
.header
= ip
;
1121 * If the hardware has not done csum over this fragment
1122 * then csum_data is not valid at all.
1124 if ((m
->m_pkthdr
.csum_flags
& (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
))
1125 == (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
)) {
1126 m
->m_pkthdr
.csum_data
= 0;
1127 m
->m_pkthdr
.csum_flags
&= ~(CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
1131 * Presence of header sizes in mbufs
1132 * would confuse code below.
1138 * If first fragment to arrive, create a reassembly queue.
1141 if ((fp
= mpipe_alloc_nowait(&ipq_mpipe
)) == NULL
)
1143 TAILQ_INSERT_HEAD(head
, fp
, ipq_list
);
1146 fp
->ipq_ttl
= IPFRAGTTL
;
1147 fp
->ipq_p
= ip
->ip_p
;
1148 fp
->ipq_id
= ip
->ip_id
;
1149 fp
->ipq_src
= ip
->ip_src
;
1150 fp
->ipq_dst
= ip
->ip_dst
;
1152 m
->m_nextpkt
= NULL
;
1157 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
1160 * Find a segment which begins after this one does.
1162 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1163 if (GETIP(q
)->ip_off
> ip
->ip_off
)
1168 * If there is a preceding segment, it may provide some of
1169 * our data already. If so, drop the data from the incoming
1170 * segment. If it provides all of our data, drop us, otherwise
1171 * stick new segment in the proper place.
1173 * If some of the data is dropped from the the preceding
1174 * segment, then it's checksum is invalidated.
1177 i
= GETIP(p
)->ip_off
+ GETIP(p
)->ip_len
- ip
->ip_off
;
1179 if (i
>= ip
->ip_len
)
1182 m
->m_pkthdr
.csum_flags
= 0;
1186 m
->m_nextpkt
= p
->m_nextpkt
;
1189 m
->m_nextpkt
= fp
->ipq_frags
;
1194 * While we overlap succeeding segments trim them or,
1195 * if they are completely covered, dequeue them.
1197 for (; q
!= NULL
&& ip
->ip_off
+ ip
->ip_len
> GETIP(q
)->ip_off
;
1199 i
= (ip
->ip_off
+ ip
->ip_len
) - GETIP(q
)->ip_off
;
1200 if (i
< GETIP(q
)->ip_len
) {
1201 GETIP(q
)->ip_len
-= i
;
1202 GETIP(q
)->ip_off
+= i
;
1204 q
->m_pkthdr
.csum_flags
= 0;
1209 ipstat
.ips_fragdropped
++;
1211 q
->m_nextpkt
= NULL
;
1217 * Check for complete reassembly and perform frag per packet
1220 * Frag limiting is performed here so that the nth frag has
1221 * a chance to complete the packet before we drop the packet.
1222 * As a result, n+1 frags are actually allowed per packet, but
1223 * only n will ever be stored. (n = maxfragsperpacket.)
1227 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1228 if (GETIP(q
)->ip_off
!= next
) {
1229 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1230 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1231 ip_freef(fragq
, head
, fp
);
1235 next
+= GETIP(q
)->ip_len
;
1237 /* Make sure the last packet didn't have the IP_MF flag */
1238 if (p
->m_flags
& M_FRAG
) {
1239 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1240 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1241 ip_freef(fragq
, head
, fp
);
1247 * Reassembly is complete. Make sure the packet is a sane size.
1251 if (next
+ (IP_VHL_HL(ip
->ip_vhl
) << 2) > IP_MAXPACKET
) {
1252 ipstat
.ips_toolong
++;
1253 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1254 ip_freef(fragq
, head
, fp
);
1259 * Concatenate fragments.
1266 q
->m_nextpkt
= NULL
;
1267 for (q
= nq
; q
!= NULL
; q
= nq
) {
1269 q
->m_nextpkt
= NULL
;
1270 m
->m_pkthdr
.csum_flags
&= q
->m_pkthdr
.csum_flags
;
1271 m
->m_pkthdr
.csum_data
+= q
->m_pkthdr
.csum_data
;
1276 * Clean up the 1's complement checksum. Carry over 16 bits must
1277 * be added back. This assumes no more then 65535 packet fragments
1278 * were reassembled. A second carry can also occur (but not a third).
1280 m
->m_pkthdr
.csum_data
= (m
->m_pkthdr
.csum_data
& 0xffff) +
1281 (m
->m_pkthdr
.csum_data
>> 16);
1282 if (m
->m_pkthdr
.csum_data
> 0xFFFF)
1283 m
->m_pkthdr
.csum_data
-= 0xFFFF;
1286 * Create header for new ip packet by
1287 * modifying header of first packet;
1288 * dequeue and discard fragment reassembly header.
1289 * Make header visible.
1292 ip
->ip_src
= fp
->ipq_src
;
1293 ip
->ip_dst
= fp
->ipq_dst
;
1294 TAILQ_REMOVE(head
, fp
, ipq_list
);
1296 mpipe_free(&ipq_mpipe
, fp
);
1297 m
->m_len
+= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1298 m
->m_data
-= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1299 /* some debugging cruft by sklower, below, will go away soon */
1300 if (m
->m_flags
& M_PKTHDR
) { /* XXX this should be done elsewhere */
1303 for (n
= m
; n
; n
= n
->m_next
)
1305 m
->m_pkthdr
.len
= plen
;
1309 * Reassembly complete, return the next protocol.
1311 * Be sure to clear M_HASH to force the packet
1312 * to be re-characterized.
1314 * Clear M_FRAG, we are no longer a fragment.
1316 m
->m_flags
&= ~(M_HASH
| M_FRAG
);
1318 ipstat
.ips_reassembled
++;
1322 ipstat
.ips_fragdropped
++;
1333 * Free a fragment reassembly header and all
1334 * associated datagrams.
1337 ip_freef(struct ipfrag_queue
*fragq
, struct ipqhead
*fhp
, struct ipq
*fp
)
1342 * Remove first to protect against blocking
1344 TAILQ_REMOVE(fhp
, fp
, ipq_list
);
1347 * Clean out at our leisure
1349 while (fp
->ipq_frags
) {
1351 fp
->ipq_frags
= q
->m_nextpkt
;
1352 q
->m_nextpkt
= NULL
;
1355 mpipe_free(&ipq_mpipe
, fp
);
1360 * If a timer expires on a reassembly queue, discard it.
1363 ipfrag_timeo_dispatch(netmsg_t nmsg
)
1365 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1366 struct ipq
*fp
, *fp_temp
;
1367 struct ipqhead
*head
;
1371 netisr_replymsg(&nmsg
->base
, 0); /* reply ASAP */
1374 if (fragq
->nipq
== 0)
1377 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1378 head
= &fragq
->ipq
[i
];
1379 TAILQ_FOREACH_MUTABLE(fp
, head
, ipq_list
, fp_temp
) {
1380 if (--fp
->ipq_ttl
== 0) {
1381 ipstat
.ips_fragtimeout
+= fp
->ipq_nfrags
;
1382 ip_freef(fragq
, head
, fp
);
1387 * If we are over the maximum number of fragments
1388 * (due to the limit being lowered), drain off
1389 * enough to get down to the new limit.
1391 if (maxnipq
>= 0 && fragq
->nipq
> maxnipq
) {
1392 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1393 head
= &fragq
->ipq
[i
];
1394 while (fragq
->nipq
> maxnipq
&& !TAILQ_EMPTY(head
)) {
1395 ipstat
.ips_fragdropped
+=
1396 TAILQ_FIRST(head
)->ipq_nfrags
;
1397 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1402 callout_reset(&fragq
->timeo_ch
, IPFRAG_TIMEO
, ipfrag_timeo
, NULL
);
1406 ipfrag_timeo(void *dummy __unused
)
1408 struct netmsg_base
*msg
= &ipfrag_queue_pcpu
[mycpuid
].timeo_netmsg
;
1411 if (msg
->lmsg
.ms_flags
& MSGF_DONE
)
1412 netisr_sendmsg_oncpu(msg
);
1417 * Drain off all datagram fragments.
1420 ipfrag_drain_oncpu(struct ipfrag_queue
*fragq
)
1422 struct ipqhead
*head
;
1425 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1426 head
= &fragq
->ipq
[i
];
1427 while (!TAILQ_EMPTY(head
)) {
1428 ipstat
.ips_fragdropped
+= TAILQ_FIRST(head
)->ipq_nfrags
;
1429 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1435 ipfrag_drain_dispatch(netmsg_t nmsg
)
1437 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1440 lwkt_replymsg(&nmsg
->lmsg
, 0); /* reply ASAP */
1443 ipfrag_drain_oncpu(fragq
);
1444 fragq
->draining
= 0;
1448 ipfrag_drain_ipi(void *arg __unused
)
1451 struct lwkt_msg
*msg
= &ipfrag_queue_pcpu
[cpu
].drain_netmsg
.lmsg
;
1454 if (msg
->ms_flags
& MSGF_DONE
)
1455 lwkt_sendmsg_oncpu(netisr_cpuport(cpu
), msg
);
1465 CPUMASK_ASSBMASK(mask
, netisr_ncpus
);
1466 CPUMASK_ANDMASK(mask
, smp_active_mask
);
1468 if (IN_NETISR_NCPUS(mycpuid
)) {
1469 ipfrag_drain_oncpu(&ipfrag_queue_pcpu
[mycpuid
]);
1470 CPUMASK_NANDBIT(mask
, mycpuid
);
1473 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
1474 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[cpu
];
1476 if (!CPUMASK_TESTBIT(mask
, cpu
))
1479 if (fragq
->nipq
== 0 || fragq
->draining
) {
1480 /* No fragments or is draining; skip this cpu. */
1481 CPUMASK_NANDBIT(mask
, cpu
);
1484 fragq
->draining
= 1;
1487 if (CPUMASK_TESTNZERO(mask
))
1488 lwkt_send_ipiq_mask(mask
, ipfrag_drain_ipi
, NULL
);
1499 * Do option processing on a datagram,
1500 * possibly discarding it if bad options are encountered,
1501 * or forwarding it if source-routed.
1502 * The pass argument is used when operating in the IPSTEALTH
1503 * mode to tell what options to process:
1504 * [LS]SRR (pass 0) or the others (pass 1).
1505 * The reason for as many as two passes is that when doing IPSTEALTH,
1506 * non-routing options should be processed only if the packet is for us.
1507 * Returns 1 if packet has been forwarded/freed,
1508 * 0 if the packet should be processed further.
1511 ip_dooptions(struct mbuf
*m
, int pass
, struct sockaddr_in
*next_hop
)
1513 struct sockaddr_in ipaddr
= { sizeof ipaddr
, AF_INET
};
1514 struct ip
*ip
= mtod(m
, struct ip
*);
1516 struct in_ifaddr
*ia
;
1517 int opt
, optlen
, cnt
, off
, code
, type
= ICMP_PARAMPROB
;
1518 boolean_t forward
= FALSE
;
1519 struct in_addr
*sin
, dst
;
1523 cp
= (u_char
*)(ip
+ 1);
1524 cnt
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1525 for (; cnt
> 0; cnt
-= optlen
, cp
+= optlen
) {
1526 opt
= cp
[IPOPT_OPTVAL
];
1527 if (opt
== IPOPT_EOL
)
1529 if (opt
== IPOPT_NOP
)
1532 if (cnt
< IPOPT_OLEN
+ sizeof(*cp
)) {
1533 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1536 optlen
= cp
[IPOPT_OLEN
];
1537 if (optlen
< IPOPT_OLEN
+ sizeof(*cp
) || optlen
> cnt
) {
1538 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1548 * Source routing with record.
1549 * Find interface with current destination address.
1550 * If none on this machine then drop if strictly routed,
1551 * or do nothing if loosely routed.
1552 * Record interface address and bring up next address
1553 * component. If strictly routed make sure next
1554 * address is on directly accessible net.
1558 if (ipstealth
&& pass
> 0)
1560 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1561 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1564 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1565 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1568 ipaddr
.sin_addr
= ip
->ip_dst
;
1569 ia
= (struct in_ifaddr
*)
1570 ifa_ifwithaddr((struct sockaddr
*)&ipaddr
);
1572 if (opt
== IPOPT_SSRR
) {
1573 type
= ICMP_UNREACH
;
1574 code
= ICMP_UNREACH_SRCFAIL
;
1577 if (!ip_dosourceroute
)
1578 goto nosourcerouting
;
1580 * Loose routing, and not at next destination
1581 * yet; nothing to do except forward.
1585 off
--; /* 0 origin */
1586 if (off
> optlen
- (int)sizeof(struct in_addr
)) {
1588 * End of source route. Should be for us.
1590 if (!ip_acceptsourceroute
)
1591 goto nosourcerouting
;
1592 save_rte(m
, cp
, ip
->ip_src
);
1597 if (!ip_dosourceroute
) {
1599 char sbuf
[INET_ADDRSTRLEN
];
1600 char dbuf
[INET_ADDRSTRLEN
];
1603 * Acting as a router, so generate ICMP
1607 "attempted source route from %s to %s\n",
1608 kinet_ntoa(ip
->ip_src
, sbuf
),
1609 kinet_ntoa(ip
->ip_dst
, dbuf
));
1610 type
= ICMP_UNREACH
;
1611 code
= ICMP_UNREACH_SRCFAIL
;
1615 * Not acting as a router,
1619 ipstat
.ips_cantforward
++;
1626 * locate outgoing interface
1628 memcpy(&ipaddr
.sin_addr
, cp
+ off
,
1629 sizeof ipaddr
.sin_addr
);
1631 if (opt
== IPOPT_SSRR
) {
1632 #define INA struct in_ifaddr *
1633 #define SA struct sockaddr *
1634 if ((ia
= (INA
)ifa_ifwithdstaddr((SA
)&ipaddr
))
1636 ia
= (INA
)ifa_ifwithnet((SA
)&ipaddr
);
1638 ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
);
1641 type
= ICMP_UNREACH
;
1642 code
= ICMP_UNREACH_SRCFAIL
;
1645 ip
->ip_dst
= ipaddr
.sin_addr
;
1646 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1647 sizeof(struct in_addr
));
1648 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1650 * Let ip_intr's mcast routing check handle mcast pkts
1652 forward
= !IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
));
1656 if (ipstealth
&& pass
== 0)
1658 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1659 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1662 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1663 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1667 * If no space remains, ignore.
1669 off
--; /* 0 origin */
1670 if (off
> optlen
- (int)sizeof(struct in_addr
))
1672 memcpy(&ipaddr
.sin_addr
, &ip
->ip_dst
,
1673 sizeof ipaddr
.sin_addr
);
1675 * locate outgoing interface; if we're the destination,
1676 * use the incoming interface (should be same).
1678 if ((ia
= (INA
)ifa_ifwithaddr((SA
)&ipaddr
)) == NULL
&&
1679 (ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
)) == NULL
) {
1680 type
= ICMP_UNREACH
;
1681 code
= ICMP_UNREACH_HOST
;
1684 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1685 sizeof(struct in_addr
));
1686 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1690 if (ipstealth
&& pass
== 0)
1692 code
= cp
- (u_char
*)ip
;
1693 if (optlen
< 4 || optlen
> 40) {
1694 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1697 if ((off
= cp
[IPOPT_OFFSET
]) < 5) {
1698 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1701 if (off
> optlen
- (int)sizeof(int32_t)) {
1702 cp
[IPOPT_OFFSET
+ 1] += (1 << 4);
1703 if ((cp
[IPOPT_OFFSET
+ 1] & 0xf0) == 0) {
1704 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1709 off
--; /* 0 origin */
1710 sin
= (struct in_addr
*)(cp
+ off
);
1711 switch (cp
[IPOPT_OFFSET
+ 1] & 0x0f) {
1713 case IPOPT_TS_TSONLY
:
1716 case IPOPT_TS_TSANDADDR
:
1717 if (off
+ sizeof(n_time
) +
1718 sizeof(struct in_addr
) > optlen
) {
1719 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1722 ipaddr
.sin_addr
= dst
;
1723 ia
= (INA
)ifaof_ifpforaddr((SA
)&ipaddr
,
1727 memcpy(sin
, &IA_SIN(ia
)->sin_addr
,
1728 sizeof(struct in_addr
));
1729 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1730 off
+= sizeof(struct in_addr
);
1733 case IPOPT_TS_PRESPEC
:
1734 if (off
+ sizeof(n_time
) +
1735 sizeof(struct in_addr
) > optlen
) {
1736 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1739 memcpy(&ipaddr
.sin_addr
, sin
,
1740 sizeof(struct in_addr
));
1741 if (ifa_ifwithaddr((SA
)&ipaddr
) == NULL
)
1743 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1744 off
+= sizeof(struct in_addr
);
1748 code
= &cp
[IPOPT_OFFSET
+ 1] - (u_char
*)ip
;
1752 memcpy(cp
+ off
, &ntime
, sizeof(n_time
));
1753 cp
[IPOPT_OFFSET
] += sizeof(n_time
);
1756 if (forward
&& ipforwarding
) {
1757 ip_forward(m
, TRUE
, next_hop
);
1762 icmp_error(m
, type
, code
, 0, 0);
1763 ipstat
.ips_badoptions
++;
1768 * Given address of next destination (final or next hop),
1769 * return internet address info of interface to be used to get there.
1772 ip_rtaddr(struct in_addr dst
, struct route
*ro0
)
1774 struct route sro
, *ro
;
1775 struct sockaddr_in
*sin
;
1776 struct in_ifaddr
*ia
;
1781 bzero(&sro
, sizeof(sro
));
1785 sin
= (struct sockaddr_in
*)&ro
->ro_dst
;
1787 if (ro
->ro_rt
== NULL
|| dst
.s_addr
!= sin
->sin_addr
.s_addr
) {
1788 if (ro
->ro_rt
!= NULL
) {
1792 sin
->sin_family
= AF_INET
;
1793 sin
->sin_len
= sizeof *sin
;
1794 sin
->sin_addr
= dst
;
1795 rtalloc_ign(ro
, RTF_PRCLONING
);
1798 if (ro
->ro_rt
== NULL
)
1801 ia
= ifatoia(ro
->ro_rt
->rt_ifa
);
1809 * Save incoming source route for use in replies,
1810 * to be picked up later by ip_srcroute if the receiver is interested.
1813 save_rte(struct mbuf
*m
, u_char
*option
, struct in_addr dst
)
1816 struct ip_srcrt_opt
*opt
;
1819 mtag
= m_tag_get(PACKET_TAG_IPSRCRT
, sizeof(*opt
), M_NOWAIT
);
1822 opt
= m_tag_data(mtag
);
1824 olen
= option
[IPOPT_OLEN
];
1827 kprintf("save_rte: olen %d\n", olen
);
1829 if (olen
> sizeof(opt
->ip_srcrt
) - (1 + sizeof(dst
))) {
1833 bcopy(option
, opt
->ip_srcrt
.srcopt
, olen
);
1834 opt
->ip_nhops
= (olen
- IPOPT_OFFSET
- 1) / sizeof(struct in_addr
);
1835 opt
->ip_srcrt
.dst
= dst
;
1836 m_tag_prepend(m
, mtag
);
1840 * Retrieve incoming source route for use in replies,
1841 * in the same form used by setsockopt.
1842 * The first hop is placed before the options, will be removed later.
1845 ip_srcroute(struct mbuf
*m0
)
1847 struct in_addr
*p
, *q
;
1850 struct ip_srcrt_opt
*opt
;
1855 mtag
= m_tag_find(m0
, PACKET_TAG_IPSRCRT
, NULL
);
1858 opt
= m_tag_data(mtag
);
1860 if (opt
->ip_nhops
== 0)
1862 m
= m_get(M_NOWAIT
, MT_HEADER
);
1866 #define OPTSIZ (sizeof(opt->ip_srcrt.nop) + sizeof(opt->ip_srcrt.srcopt))
1868 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1869 m
->m_len
= opt
->ip_nhops
* sizeof(struct in_addr
) +
1870 sizeof(struct in_addr
) + OPTSIZ
;
1873 kprintf("ip_srcroute: nhops %d mlen %d",
1874 opt
->ip_nhops
, m
->m_len
);
1879 * First save first hop for return route
1881 p
= &opt
->ip_srcrt
.route
[opt
->ip_nhops
- 1];
1882 *(mtod(m
, struct in_addr
*)) = *p
--;
1885 kprintf(" hops %x", ntohl(mtod(m
, struct in_addr
*)->s_addr
));
1889 * Copy option fields and padding (nop) to mbuf.
1891 opt
->ip_srcrt
.nop
= IPOPT_NOP
;
1892 opt
->ip_srcrt
.srcopt
[IPOPT_OFFSET
] = IPOPT_MINOFF
;
1893 memcpy(mtod(m
, caddr_t
) + sizeof(struct in_addr
), &opt
->ip_srcrt
.nop
,
1895 q
= (struct in_addr
*)(mtod(m
, caddr_t
) +
1896 sizeof(struct in_addr
) + OPTSIZ
);
1899 * Record return path as an IP source route,
1900 * reversing the path (pointers are now aligned).
1902 while (p
>= opt
->ip_srcrt
.route
) {
1905 kprintf(" %x", ntohl(q
->s_addr
));
1910 * Last hop goes to final destination.
1912 *q
= opt
->ip_srcrt
.dst
;
1913 m_tag_delete(m0
, mtag
);
1916 kprintf(" %x\n", ntohl(q
->s_addr
));
1922 * Strip out IP options.
1925 ip_stripoptions(struct mbuf
*m
)
1928 struct ip
*ip
= mtod(m
, struct ip
*);
1932 optlen
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1933 opts
= (caddr_t
)(ip
+ 1);
1934 datalen
= m
->m_len
- (sizeof(struct ip
) + optlen
);
1935 bcopy(opts
+ optlen
, opts
, datalen
);
1937 if (m
->m_flags
& M_PKTHDR
)
1938 m
->m_pkthdr
.len
-= optlen
;
1939 ip
->ip_vhl
= IP_MAKE_VHL(IPVERSION
, sizeof(struct ip
) >> 2);
1942 u_char inetctlerrmap
[PRC_NCMDS
] = {
1944 0, EMSGSIZE
, EHOSTDOWN
, EHOSTUNREACH
,
1945 EHOSTUNREACH
, EHOSTUNREACH
, ECONNREFUSED
, ECONNREFUSED
,
1946 EMSGSIZE
, EHOSTUNREACH
, 0, 0,
1948 ENOPROTOOPT
, ECONNREFUSED
1952 * Forward a packet. If some error occurs return the sender
1953 * an icmp packet. Note we can't always generate a meaningful
1954 * icmp message because icmp doesn't have a large enough repertoire
1955 * of codes and types.
1957 * If not forwarding, just drop the packet. This could be confusing
1958 * if ipforwarding was zero but some routing protocol was advancing
1959 * us as a gateway to somewhere. However, we must let the routing
1960 * protocol deal with that.
1962 * The using_srcrt parameter indicates whether the packet is being forwarded
1963 * via a source route.
1966 ip_forward(struct mbuf
*m
, boolean_t using_srcrt
, struct sockaddr_in
*next_hop
)
1968 struct ip
*ip
= mtod(m
, struct ip
*);
1970 struct route fwd_ro
;
1971 int error
, type
= 0, code
= 0, destmtu
= 0;
1972 struct mbuf
*mcopy
, *mtemp
= NULL
;
1974 struct in_addr pkt_dst
;
1978 * Cache the destination address of the packet; this may be
1979 * changed by use of 'ipfw fwd'.
1981 pkt_dst
= (next_hop
!= NULL
) ? next_hop
->sin_addr
: ip
->ip_dst
;
1985 kprintf("forward: src %x dst %x ttl %x\n",
1986 ip
->ip_src
.s_addr
, pkt_dst
.s_addr
, ip
->ip_ttl
);
1989 if (m
->m_flags
& (M_BCAST
| M_MCAST
) || !in_canforward(pkt_dst
)) {
1990 ipstat
.ips_cantforward
++;
1994 if (!ipstealth
&& ip
->ip_ttl
<= IPTTLDEC
) {
1995 icmp_error(m
, ICMP_TIMXCEED
, ICMP_TIMXCEED_INTRANS
, dest
, 0);
1999 bzero(&fwd_ro
, sizeof(fwd_ro
));
2000 ip_rtaddr(pkt_dst
, &fwd_ro
);
2001 if (fwd_ro
.ro_rt
== NULL
) {
2002 icmp_error(m
, ICMP_UNREACH
, ICMP_UNREACH_HOST
, dest
, 0);
2007 if (curthread
->td_type
== TD_TYPE_NETISR
) {
2009 * Save the IP header and at most 8 bytes of the payload,
2010 * in case we need to generate an ICMP message to the src.
2012 mtemp
= ipforward_mtemp
[mycpuid
];
2013 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2014 mtemp
->m_data
== mtemp
->m_pktdat
&&
2015 m_tag_first(mtemp
) == NULL
,
2016 ("ip_forward invalid mtemp1"));
2018 if (!m_dup_pkthdr(mtemp
, m
, M_NOWAIT
)) {
2020 * It's probably ok if the pkthdr dup fails (because
2021 * the deep copy of the tag chain failed), but for now
2022 * be conservative and just discard the copy since
2023 * code below may some day want the tags.
2027 mtemp
->m_type
= m
->m_type
;
2028 mtemp
->m_len
= imin((IP_VHL_HL(ip
->ip_vhl
) << 2) + 8,
2030 mtemp
->m_pkthdr
.len
= mtemp
->m_len
;
2031 m_copydata(m
, 0, mtemp
->m_len
, mtod(mtemp
, caddr_t
));
2036 ip
->ip_ttl
-= IPTTLDEC
;
2039 * If forwarding packet using same interface that it came in on,
2040 * perhaps should send a redirect to sender to shortcut a hop.
2041 * Only send redirect if source is sending directly to us,
2042 * and if packet was not source routed (or has any options).
2043 * Also, don't send redirect if forwarding using a default route
2044 * or a route modified by a redirect.
2046 if (rt
->rt_ifp
== m
->m_pkthdr
.rcvif
&&
2047 !(rt
->rt_flags
& (RTF_DYNAMIC
| RTF_MODIFIED
)) &&
2048 satosin(rt_key(rt
))->sin_addr
.s_addr
!= INADDR_ANY
&&
2049 ipsendredirects
&& !using_srcrt
&& next_hop
== NULL
) {
2050 u_long src
= ntohl(ip
->ip_src
.s_addr
);
2051 struct in_ifaddr
*rt_ifa
= (struct in_ifaddr
*)rt
->rt_ifa
;
2053 if (rt_ifa
!= NULL
&&
2054 (src
& rt_ifa
->ia_subnetmask
) == rt_ifa
->ia_subnet
) {
2055 if (rt
->rt_flags
& RTF_GATEWAY
)
2056 dest
= satosin(rt
->rt_gateway
)->sin_addr
.s_addr
;
2058 dest
= pkt_dst
.s_addr
;
2060 * Router requirements says to only send
2063 type
= ICMP_REDIRECT
;
2064 code
= ICMP_REDIRECT_HOST
;
2067 kprintf("redirect (%d) to %x\n", code
, dest
);
2072 error
= ip_output(m
, NULL
, &fwd_ro
, IP_FORWARDING
, NULL
, NULL
);
2074 ipstat
.ips_forward
++;
2077 ipflow_create(&fwd_ro
, mtemp
);
2080 ipstat
.ips_redirectsent
++;
2082 ipstat
.ips_cantforward
++;
2089 * Errors that do not require generating ICMP message
2094 * A router should not generate ICMP_SOURCEQUENCH as
2095 * required in RFC1812 Requirements for IP Version 4 Routers.
2096 * Source quench could be a big problem under DoS attacks,
2097 * or if the underlying interface is rate-limited.
2098 * Those who need source quench packets may re-enable them
2099 * via the net.inet.ip.sendsourcequench sysctl.
2101 if (!ip_sendsourcequench
)
2105 case EACCES
: /* ipfw denied packet */
2109 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2110 mtemp
->m_data
== mtemp
->m_pktdat
,
2111 ("ip_forward invalid mtemp2"));
2112 mcopy
= m_copym(mtemp
, 0, mtemp
->m_len
, M_NOWAIT
);
2117 * Send ICMP message.
2120 case 0: /* forwarded, but need redirect */
2121 /* type, code set above */
2124 case ENETUNREACH
: /* shouldn't happen, checked above */
2129 type
= ICMP_UNREACH
;
2130 code
= ICMP_UNREACH_HOST
;
2134 type
= ICMP_UNREACH
;
2135 code
= ICMP_UNREACH_NEEDFRAG
;
2138 * If the packet is routed over IPsec tunnel, tell the
2139 * originator the tunnel MTU.
2140 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2143 if (fwd_ro
.ro_rt
!= NULL
) {
2144 struct secpolicy
*sp
= NULL
;
2149 sp
= ipsec4_getpolicybyaddr(mcopy
,
2155 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2157 /* count IPsec header size */
2158 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2163 * find the correct route for outer IPv4
2164 * header, compute tunnel MTU.
2167 if (sp
->req
!= NULL
&& sp
->req
->sav
!= NULL
&&
2168 sp
->req
->sav
->sah
!= NULL
) {
2169 ro
= &sp
->req
->sav
->sah
->sa_route
;
2170 if (ro
->ro_rt
!= NULL
&&
2171 ro
->ro_rt
->rt_ifp
!= NULL
) {
2173 ro
->ro_rt
->rt_ifp
->if_mtu
;
2174 destmtu
-= ipsechdr
;
2181 #elif defined(FAST_IPSEC)
2183 * If the packet is routed over IPsec tunnel, tell the
2184 * originator the tunnel MTU.
2185 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2188 if (fwd_ro
.ro_rt
!= NULL
) {
2189 struct secpolicy
*sp
= NULL
;
2194 sp
= ipsec_getpolicybyaddr(mcopy
,
2200 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2202 /* count IPsec header size */
2203 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2208 * find the correct route for outer IPv4
2209 * header, compute tunnel MTU.
2212 if (sp
->req
!= NULL
&&
2213 sp
->req
->sav
!= NULL
&&
2214 sp
->req
->sav
->sah
!= NULL
) {
2215 ro
= &sp
->req
->sav
->sah
->sa_route
;
2216 if (ro
->ro_rt
!= NULL
&&
2217 ro
->ro_rt
->rt_ifp
!= NULL
) {
2219 ro
->ro_rt
->rt_ifp
->if_mtu
;
2220 destmtu
-= ipsechdr
;
2227 #else /* !IPSEC && !FAST_IPSEC */
2228 if (fwd_ro
.ro_rt
!= NULL
)
2229 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2231 ipstat
.ips_cantfrag
++;
2235 type
= ICMP_SOURCEQUENCH
;
2239 case EACCES
: /* ipfw denied packet */
2240 panic("ip_forward EACCES should not reach");
2242 icmp_error(mcopy
, type
, code
, dest
, destmtu
);
2245 m_tag_delete_chain(mtemp
);
2246 if (fwd_ro
.ro_rt
!= NULL
)
2247 RTFREE(fwd_ro
.ro_rt
);
2251 ip_savecontrol(struct inpcb
*inp
, struct mbuf
**mp
, struct ip
*ip
,
2254 if (inp
->inp_socket
->so_options
& SO_TIMESTAMP
) {
2258 *mp
= sbcreatecontrol((caddr_t
) &tv
, sizeof(tv
),
2259 SCM_TIMESTAMP
, SOL_SOCKET
);
2261 mp
= &(*mp
)->m_next
;
2263 if (inp
->inp_flags
& INP_RECVDSTADDR
) {
2264 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_dst
,
2265 sizeof(struct in_addr
), IP_RECVDSTADDR
, IPPROTO_IP
);
2267 mp
= &(*mp
)->m_next
;
2269 if (inp
->inp_flags
& INP_RECVTTL
) {
2270 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_ttl
,
2271 sizeof(u_char
), IP_RECVTTL
, IPPROTO_IP
);
2273 mp
= &(*mp
)->m_next
;
2277 * Moving these out of udp_input() made them even more broken
2278 * than they already were.
2280 /* options were tossed already */
2281 if (inp
->inp_flags
& INP_RECVOPTS
) {
2282 *mp
= sbcreatecontrol((caddr_t
) opts_deleted_above
,
2283 sizeof(struct in_addr
), IP_RECVOPTS
, IPPROTO_IP
);
2285 mp
= &(*mp
)->m_next
;
2287 /* ip_srcroute doesn't do what we want here, need to fix */
2288 if (inp
->inp_flags
& INP_RECVRETOPTS
) {
2289 *mp
= sbcreatecontrol((caddr_t
) ip_srcroute(m
),
2290 sizeof(struct in_addr
), IP_RECVRETOPTS
, IPPROTO_IP
);
2292 mp
= &(*mp
)->m_next
;
2295 if (inp
->inp_flags
& INP_RECVIF
) {
2298 struct sockaddr_dl sdl
;
2301 struct sockaddr_dl
*sdp
;
2302 struct sockaddr_dl
*sdl2
= &sdlbuf
.sdl
;
2304 if (((ifp
= m
->m_pkthdr
.rcvif
)) &&
2305 ((ifp
->if_index
!= 0) && (ifp
->if_index
<= if_index
))) {
2306 sdp
= IF_LLSOCKADDR(ifp
);
2308 * Change our mind and don't try copy.
2310 if ((sdp
->sdl_family
!= AF_LINK
) ||
2311 (sdp
->sdl_len
> sizeof(sdlbuf
))) {
2314 bcopy(sdp
, sdl2
, sdp
->sdl_len
);
2318 offsetof(struct sockaddr_dl
, sdl_data
[0]);
2319 sdl2
->sdl_family
= AF_LINK
;
2320 sdl2
->sdl_index
= 0;
2321 sdl2
->sdl_nlen
= sdl2
->sdl_alen
= sdl2
->sdl_slen
= 0;
2323 *mp
= sbcreatecontrol((caddr_t
) sdl2
, sdl2
->sdl_len
,
2324 IP_RECVIF
, IPPROTO_IP
);
2326 mp
= &(*mp
)->m_next
;
2331 * XXX these routines are called from the upper part of the kernel.
2333 * They could also be moved to ip_mroute.c, since all the RSVP
2334 * handling is done there already.
2337 ip_rsvp_init(struct socket
*so
)
2339 if (so
->so_type
!= SOCK_RAW
||
2340 so
->so_proto
->pr_protocol
!= IPPROTO_RSVP
)
2343 if (ip_rsvpd
!= NULL
)
2348 * This may seem silly, but we need to be sure we don't over-increment
2349 * the RSVP counter, in case something slips up.
2364 * This may seem silly, but we need to be sure we don't over-decrement
2365 * the RSVP counter, in case something slips up.
2375 rsvp_input(struct mbuf
**mp
, int *offp
, int proto
)
2377 struct mbuf
*m
= *mp
;
2381 if (rsvp_input_p
) { /* call the real one if loaded */
2383 rsvp_input_p(mp
, offp
, proto
);
2384 return(IPPROTO_DONE
);
2387 /* Can still get packets with rsvp_on = 0 if there is a local member
2388 * of the group to which the RSVP packet is addressed. But in this
2389 * case we want to throw the packet away.
2394 return(IPPROTO_DONE
);
2397 if (ip_rsvpd
!= NULL
) {
2399 rip_input(mp
, offp
, proto
);
2400 return(IPPROTO_DONE
);
2402 /* Drop the packet */
2404 return(IPPROTO_DONE
);