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
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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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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");
158 static int ip_keepfaith
= 0;
159 SYSCTL_INT(_net_inet_ip
, IPCTL_KEEPFAITH
, keepfaith
, CTLFLAG_RW
,
161 "Enable packet capture for FAITH IPv4->IPv6 translator daemon");
164 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragpackets
, CTLFLAG_RW
,
166 "Maximum number of IPv4 fragment reassembly queue entries");
168 static int maxfragsperpacket
;
169 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragsperpacket
, CTLFLAG_RW
,
170 &maxfragsperpacket
, 0,
171 "Maximum number of IPv4 fragments allowed per packet");
173 static int ip_sendsourcequench
= 0;
174 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, sendsourcequench
, CTLFLAG_RW
,
175 &ip_sendsourcequench
, 0,
176 "Enable the transmission of source quench packets");
178 int ip_do_randomid
= 1;
179 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, random_id
, CTLFLAG_RW
,
181 "Assign random ip_id values");
183 * XXX - Setting ip_checkinterface mostly implements the receive side of
184 * the Strong ES model described in RFC 1122, but since the routing table
185 * and transmit implementation do not implement the Strong ES model,
186 * setting this to 1 results in an odd hybrid.
188 * XXX - ip_checkinterface currently must be disabled if you use ipnat
189 * to translate the destination address to another local interface.
191 * XXX - ip_checkinterface must be disabled if you add IP aliases
192 * to the loopback interface instead of the interface where the
193 * packets for those addresses are received.
195 static int ip_checkinterface
= 0;
196 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, check_interface
, CTLFLAG_RW
,
197 &ip_checkinterface
, 0, "Verify packet arrives on correct interface");
199 static u_long ip_hash_count
= 0;
200 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, hash_count
, CTLFLAG_RD
,
201 &ip_hash_count
, 0, "Number of packets hashed by IP");
204 static u_long ip_rehash_count
= 0;
205 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, rehash_count
, CTLFLAG_RD
,
206 &ip_rehash_count
, 0, "Number of packets rehashed by IP");
208 static u_long ip_dispatch_fast
= 0;
209 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_fast_count
, CTLFLAG_RD
,
210 &ip_dispatch_fast
, 0, "Number of packets handled on current CPU");
212 static u_long ip_dispatch_slow
= 0;
213 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_slow_count
, CTLFLAG_RD
,
214 &ip_dispatch_slow
, 0, "Number of packets messaged to another CPU");
218 static int ipprintfs
= 0;
221 extern struct domain inetdomain
;
222 extern struct protosw inetsw
[];
223 u_char ip_protox
[IPPROTO_MAX
];
224 struct in_ifaddrhead in_ifaddrheads
[MAXCPU
]; /* first inet address */
225 struct in_ifaddrhashhead
*in_ifaddrhashtbls
[MAXCPU
];
226 /* inet addr hash table */
227 u_long in_ifaddrhmask
; /* mask for hash table */
229 static struct mbuf
*ipforward_mtemp
[MAXCPU
];
231 struct ip_stats ipstats_percpu
[MAXCPU
] __cachealign
;
234 sysctl_ipstats(SYSCTL_HANDLER_ARGS
)
238 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
239 if ((error
= SYSCTL_OUT(req
, &ipstats_percpu
[cpu
],
240 sizeof(struct ip_stats
))))
242 if ((error
= SYSCTL_IN(req
, &ipstats_percpu
[cpu
],
243 sizeof(struct ip_stats
))))
249 SYSCTL_PROC(_net_inet_ip
, IPCTL_STATS
, stats
, (CTLTYPE_OPAQUE
| CTLFLAG_RW
),
250 0, 0, sysctl_ipstats
, "S,ip_stats", "IP statistics");
252 /* Packet reassembly stuff */
253 #define IPREASS_NHASH_LOG2 6
254 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
255 #define IPREASS_HMASK (IPREASS_NHASH - 1)
256 #define IPREASS_HASH(x,y) \
257 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
259 TAILQ_HEAD(ipqhead
, ipq
);
260 struct ipfrag_queue
{
262 volatile int draining
;
263 struct netmsg_base timeo_netmsg
;
264 struct callout timeo_ch
;
265 struct netmsg_base drain_netmsg
;
266 struct ipqhead ipq
[IPREASS_NHASH
];
269 static struct ipfrag_queue ipfrag_queue_pcpu
[MAXCPU
];
272 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFMTU
, mtu
, CTLFLAG_RW
,
273 &ip_mtu
, 0, "Default MTU");
277 static int ipstealth
= 0;
278 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, stealth
, CTLFLAG_RW
, &ipstealth
, 0, "");
280 static const int ipstealth
= 0;
283 struct mbuf
*(*ip_divert_p
)(struct mbuf
*, int, int);
285 struct pfil_head inet_pfil_hook
;
288 * struct ip_srcrt_opt is used to store packet state while it travels
291 * XXX Note that the code even makes assumptions on the size and
292 * alignment of fields inside struct ip_srcrt so e.g. adding some
293 * fields will break the code. This needs to be fixed.
295 * We need to save the IP options in case a protocol wants to respond
296 * to an incoming packet over the same route if the packet got here
297 * using IP source routing. This allows connection establishment and
298 * maintenance when the remote end is on a network that is not known
302 struct in_addr dst
; /* final destination */
303 char nop
; /* one NOP to align */
304 char srcopt
[IPOPT_OFFSET
+ 1]; /* OPTVAL, OLEN and OFFSET */
305 struct in_addr route
[MAX_IPOPTLEN
/sizeof(struct in_addr
)];
308 struct ip_srcrt_opt
{
310 struct ip_srcrt ip_srcrt
;
313 #define IPFRAG_MPIPE_MAX 4096
314 #define MAXIPFRAG_MIN ((IPFRAG_MPIPE_MAX * 2) / 256)
316 #define IPFRAG_TIMEO (hz / PR_SLOWHZ)
318 static MALLOC_DEFINE(M_IPQ
, "ipq", "IP Fragment Management");
319 static struct malloc_pipe ipq_mpipe
;
321 static void save_rte(struct mbuf
*, u_char
*, struct in_addr
);
322 static int ip_dooptions(struct mbuf
*m
, int, struct sockaddr_in
*);
323 static void ip_freef(struct ipfrag_queue
*, struct ipqhead
*,
325 static void ip_input_handler(netmsg_t
);
327 static void ipfrag_timeo_dispatch(netmsg_t
);
328 static void ipfrag_timeo(void *);
329 static void ipfrag_drain_dispatch(netmsg_t
);
332 * IP initialization: fill in IP protocol switch table.
333 * All protocols not implemented in kernel go to raw IP protocol handler.
338 struct ipfrag_queue
*fragq
;
343 * Make sure we can handle a reasonable number of fragments but
344 * cap it at IPFRAG_MPIPE_MAX.
346 mpipe_init(&ipq_mpipe
, M_IPQ
, sizeof(struct ipq
),
347 IFQ_MAXLEN
, IPFRAG_MPIPE_MAX
, 0, NULL
, NULL
, NULL
);
350 * Make in_ifaddrhead and in_ifaddrhashtbl available on all CPUs,
351 * since they could be accessed by any threads.
353 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
354 TAILQ_INIT(&in_ifaddrheads
[cpu
]);
355 in_ifaddrhashtbls
[cpu
] =
356 hashinit(INADDR_NHASH
, M_IFADDR
, &in_ifaddrhmask
);
359 pr
= pffindproto(PF_INET
, IPPROTO_RAW
, SOCK_RAW
);
362 for (i
= 0; i
< IPPROTO_MAX
; i
++)
363 ip_protox
[i
] = pr
- inetsw
;
364 for (pr
= inetdomain
.dom_protosw
;
365 pr
< inetdomain
.dom_protoswNPROTOSW
; pr
++) {
366 if (pr
->pr_domain
->dom_family
== PF_INET
&& pr
->pr_protocol
) {
367 if (pr
->pr_protocol
!= IPPROTO_RAW
)
368 ip_protox
[pr
->pr_protocol
] = pr
- inetsw
;
372 inet_pfil_hook
.ph_type
= PFIL_TYPE_AF
;
373 inet_pfil_hook
.ph_af
= AF_INET
;
374 if ((i
= pfil_head_register(&inet_pfil_hook
)) != 0) {
375 kprintf("%s: WARNING: unable to register pfil hook, "
376 "error %d\n", __func__
, i
);
379 maxnipq
= (nmbclusters
/ 32) / netisr_ncpus
;
380 if (maxnipq
< MAXIPFRAG_MIN
)
381 maxnipq
= MAXIPFRAG_MIN
;
382 maxfragsperpacket
= 16;
384 ip_id
= time_second
& 0xffff; /* time_second survives reboots */
386 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
388 * Initialize IP statistics counters for each CPU.
390 bzero(&ipstats_percpu
[cpu
], sizeof(struct ip_stats
));
393 * Preallocate mbuf template for forwarding
395 MGETHDR(ipforward_mtemp
[cpu
], M_WAITOK
, MT_DATA
);
398 * Initialize per-cpu ip fragments queues
400 fragq
= &ipfrag_queue_pcpu
[cpu
];
401 for (i
= 0; i
< IPREASS_NHASH
; i
++)
402 TAILQ_INIT(&fragq
->ipq
[i
]);
404 callout_init_mp(&fragq
->timeo_ch
);
405 netmsg_init(&fragq
->timeo_netmsg
, NULL
, &netisr_adone_rport
,
406 MSGF_PRIORITY
, ipfrag_timeo_dispatch
);
407 netmsg_init(&fragq
->drain_netmsg
, NULL
, &netisr_adone_rport
,
408 MSGF_PRIORITY
, ipfrag_drain_dispatch
);
411 netisr_register(NETISR_IP
, ip_input_handler
, ip_hashfn
);
412 netisr_register_hashcheck(NETISR_IP
, ip_hashcheck
);
414 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
415 fragq
= &ipfrag_queue_pcpu
[cpu
];
416 callout_reset_bycpu(&fragq
->timeo_ch
, IPFRAG_TIMEO
,
417 ipfrag_timeo
, NULL
, cpu
);
421 /* Do transport protocol processing. */
423 transport_processing_oncpu(struct mbuf
*m
, int hlen
, struct ip
*ip
)
425 const struct protosw
*pr
= &inetsw
[ip_protox
[ip
->ip_p
]];
428 * Switch out to protocol's input routine.
431 pr
->pr_input(&m
, &hlen
, ip
->ip_p
);
436 transport_processing_handler(netmsg_t msg
)
438 struct netmsg_packet
*pmsg
= &msg
->packet
;
442 ip
= mtod(pmsg
->nm_packet
, struct ip
*);
443 hlen
= pmsg
->base
.lmsg
.u
.ms_result
;
445 transport_processing_oncpu(pmsg
->nm_packet
, hlen
, ip
);
446 /* msg was embedded in the mbuf, do not reply! */
450 ip_input_handler(netmsg_t msg
)
452 ip_input(msg
->packet
.nm_packet
);
453 /* msg was embedded in the mbuf, do not reply! */
457 * IP input routine. Checksum and byte swap header. If fragmented
458 * try to reassemble. Process options. Pass to next level.
461 ip_input(struct mbuf
*m
)
464 struct in_ifaddr
*ia
= NULL
;
465 struct in_ifaddr_container
*iac
;
468 struct in_addr pkt_dst
;
469 boolean_t using_srcrt
= FALSE
; /* forward (by PFIL_HOOKS) */
470 struct in_addr odst
; /* original dst address(NAT) */
472 struct sockaddr_in
*next_hop
= NULL
;
475 struct tdb_ident
*tdbi
;
476 struct secpolicy
*sp
;
480 ASSERT_NETISR_NCPUS(mycpuid
);
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
& DUMMYNET_MBUF_TAGGED
) {
525 /* dummynet already filtered us */
526 ip
= mtod(m
, struct ip
*);
527 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
533 /* length checks already done in ip_hashfn() */
534 KASSERT(m
->m_len
>= sizeof(struct ip
), ("IP header not in one mbuf"));
536 if (IP_VHL_V(ip
->ip_vhl
) != IPVERSION
) {
537 ipstat
.ips_badvers
++;
541 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
542 /* length checks already done in ip_hashfn() */
543 KASSERT(hlen
>= sizeof(struct ip
), ("IP header len too small"));
544 KASSERT(m
->m_len
>= hlen
, ("complete IP header not in one mbuf"));
546 /* 127/8 must not appear on wire - RFC1122 */
547 if ((ntohl(ip
->ip_dst
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
||
548 (ntohl(ip
->ip_src
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
) {
549 if (!(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
)) {
550 ipstat
.ips_badaddr
++;
555 if (m
->m_pkthdr
.csum_flags
& CSUM_IP_CHECKED
) {
556 sum
= !(m
->m_pkthdr
.csum_flags
& CSUM_IP_VALID
);
558 if (hlen
== sizeof(struct ip
))
559 sum
= in_cksum_hdr(ip
);
561 sum
= in_cksum(m
, hlen
);
569 if (altq_input
!= NULL
&& (*altq_input
)(m
, AF_INET
) == 0) {
570 /* packet is dropped by traffic conditioner */
575 * Convert fields to host representation.
577 ip
->ip_len
= ntohs(ip
->ip_len
);
578 ip
->ip_off
= ntohs(ip
->ip_off
);
580 /* length checks already done in ip_hashfn() */
581 KASSERT(ip
->ip_len
>= hlen
, ("total length less then header length"));
582 KASSERT(m
->m_pkthdr
.len
>= ip
->ip_len
, ("mbuf too short"));
585 * Trim mbufs if longer than the IP header would have us expect.
587 if (m
->m_pkthdr
.len
> ip
->ip_len
) {
588 if (m
->m_len
== m
->m_pkthdr
.len
) {
589 m
->m_len
= ip
->ip_len
;
590 m
->m_pkthdr
.len
= ip
->ip_len
;
592 m_adj(m
, ip
->ip_len
- m
->m_pkthdr
.len
);
595 #if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
597 * Bypass packet filtering for packets from a tunnel (gif).
599 if (ipsec_gethist(m
, NULL
))
605 * Right now when no processing on packet has done
606 * and it is still fresh out of network we do our black
608 * - Firewall: deny/allow/divert
609 * - Xlate: translate packet's addr/port (NAT).
610 * - Pipe: pass pkt through dummynet.
611 * - Wrap: fake packet's addr/port <unimpl.>
612 * - Encapsulate: put it in another IP and send out. <unimp.>
617 * If we've been forwarded from the output side, then
618 * skip the firewall a second time
620 if (next_hop
!= NULL
)
624 if (!pfil_has_hooks(&inet_pfil_hook
)) {
625 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
627 * Strip dummynet tags from stranded packets
629 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
630 KKASSERT(mtag
!= NULL
);
631 m_tag_delete(m
, mtag
);
632 m
->m_pkthdr
.fw_flags
&= ~DUMMYNET_MBUF_TAGGED
;
638 * Run through list of hooks for input packets.
640 * NOTE! If the packet is rewritten pf/ipfw/whoever must
644 if (pfil_run_hooks(&inet_pfil_hook
, &m
, m
->m_pkthdr
.rcvif
, PFIL_IN
))
646 if (m
== NULL
) /* consumed by filter */
648 ip
= mtod(m
, struct ip
*);
649 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
650 using_srcrt
= (odst
.s_addr
!= ip
->ip_dst
.s_addr
);
652 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
653 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
654 KKASSERT(mtag
!= NULL
);
655 next_hop
= m_tag_data(mtag
);
657 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
661 if (m
->m_pkthdr
.fw_flags
& FW_MBUF_REDISPATCH
) {
662 m
->m_pkthdr
.fw_flags
&= ~FW_MBUF_REDISPATCH
;
666 * Process options and, if not destined for us,
667 * ship it on. ip_dooptions returns 1 when an
668 * error was detected (causing an icmp message
669 * to be sent and the original packet to be freed).
671 if (hlen
> sizeof(struct ip
) && ip_dooptions(m
, 0, next_hop
))
674 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
675 * matter if it is destined to another node, or whether it is
676 * a multicast one, RSVP wants it! and prevents it from being forwarded
677 * anywhere else. Also checks if the rsvp daemon is running before
678 * grabbing the packet.
680 if (rsvp_on
&& ip
->ip_p
== IPPROTO_RSVP
)
684 * Check our list of addresses, to see if the packet is for us.
685 * If we don't have any addresses, assume any unicast packet
686 * we receive might be for us (and let the upper layers deal
689 if (TAILQ_EMPTY(&in_ifaddrheads
[mycpuid
]) &&
690 !(m
->m_flags
& (M_MCAST
| M_BCAST
)))
694 * Cache the destination address of the packet; this may be
695 * changed by use of 'ipfw fwd'.
697 pkt_dst
= next_hop
? next_hop
->sin_addr
: ip
->ip_dst
;
700 * Enable a consistency check between the destination address
701 * and the arrival interface for a unicast packet (the RFC 1122
702 * strong ES model) if IP forwarding is disabled and the packet
703 * is not locally generated and the packet is not subject to
706 * XXX - Checking also should be disabled if the destination
707 * address is ipnat'ed to a different interface.
709 * XXX - Checking is incompatible with IP aliases added
710 * to the loopback interface instead of the interface where
711 * the packets are received.
713 checkif
= ip_checkinterface
&&
715 m
->m_pkthdr
.rcvif
!= NULL
&&
716 !(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
) &&
720 * Check for exact addresses in the hash bucket.
722 LIST_FOREACH(iac
, INADDR_HASH(pkt_dst
.s_addr
), ia_hash
) {
726 * If the address matches, verify that the packet
727 * arrived via the correct interface if checking is
730 if (IA_SIN(ia
)->sin_addr
.s_addr
== pkt_dst
.s_addr
&&
731 (!checkif
|| ia
->ia_ifp
== m
->m_pkthdr
.rcvif
))
737 * Check for broadcast addresses.
739 * Only accept broadcast packets that arrive via the matching
740 * interface. Reception of forwarded directed broadcasts would
741 * be handled via ip_forward() and ether_output() with the loopback
742 * into the stack for SIMPLEX interfaces handled by ether_output().
744 if (m
->m_pkthdr
.rcvif
!= NULL
&&
745 m
->m_pkthdr
.rcvif
->if_flags
& IFF_BROADCAST
) {
746 struct ifaddr_container
*ifac
;
748 TAILQ_FOREACH(ifac
, &m
->m_pkthdr
.rcvif
->if_addrheads
[mycpuid
],
750 struct ifaddr
*ifa
= ifac
->ifa
;
752 if (ifa
->ifa_addr
== NULL
) /* shutdown/startup race */
754 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
757 if (satosin(&ia
->ia_broadaddr
)->sin_addr
.s_addr
==
760 if (ia
->ia_netbroadcast
.s_addr
== pkt_dst
.s_addr
)
763 if (IA_SIN(ia
)->sin_addr
.s_addr
== INADDR_ANY
)
768 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
))) {
769 struct in_multi
*inm
;
771 if (ip_mrouter
!= NULL
) {
772 /* XXX Multicast routing is not MPSAFE yet */
776 * If we are acting as a multicast router, all
777 * incoming multicast packets are passed to the
778 * kernel-level multicast forwarding function.
779 * The packet is returned (relatively) intact; if
780 * ip_mforward() returns a non-zero value, the packet
781 * must be discarded, else it may be accepted below.
783 if (ip_mforward
!= NULL
&&
784 ip_mforward(ip
, m
->m_pkthdr
.rcvif
, m
, NULL
) != 0) {
786 ipstat
.ips_cantforward
++;
794 * The process-level routing daemon needs to receive
795 * all multicast IGMP packets, whether or not this
796 * host belongs to their destination groups.
798 if (ip
->ip_p
== IPPROTO_IGMP
)
800 ipstat
.ips_forward
++;
803 * See if we belong to the destination multicast group on the
806 inm
= IN_LOOKUP_MULTI(&ip
->ip_dst
, m
->m_pkthdr
.rcvif
);
808 ipstat
.ips_notmember
++;
814 if (ip
->ip_dst
.s_addr
== INADDR_BROADCAST
)
816 if (ip
->ip_dst
.s_addr
== INADDR_ANY
)
820 * FAITH(Firewall Aided Internet Translator)
822 if (m
->m_pkthdr
.rcvif
&& m
->m_pkthdr
.rcvif
->if_type
== IFT_FAITH
) {
824 if (ip
->ip_p
== IPPROTO_TCP
|| ip
->ip_p
== IPPROTO_ICMP
)
832 * Not for us; forward if possible and desirable.
835 ipstat
.ips_cantforward
++;
840 * Enforce inbound IPsec SPD.
842 if (ipsec4_in_reject(m
, NULL
)) {
843 ipsecstat
.in_polvio
++;
848 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
851 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
852 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
854 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
855 IP_FORWARDING
, &error
);
857 if (sp
== NULL
) { /* NB: can happen if error */
859 /*XXX error stat???*/
860 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
865 * Check security policy against packet attributes.
867 error
= ipsec_in_reject(sp
, m
);
871 ipstat
.ips_cantforward
++;
875 ip_forward(m
, using_srcrt
, next_hop
);
882 * IPSTEALTH: Process non-routing options only
883 * if the packet is destined for us.
886 hlen
> sizeof(struct ip
) &&
887 ip_dooptions(m
, 1, next_hop
))
890 /* Count the packet in the ip address stats */
892 IFA_STAT_INC(&ia
->ia_ifa
, ipackets
, 1);
893 IFA_STAT_INC(&ia
->ia_ifa
, ibytes
, m
->m_pkthdr
.len
);
897 * If offset or IP_MF are set, must reassemble.
898 * Otherwise, nothing need be done.
899 * (We could look in the reassembly queue to see
900 * if the packet was previously fragmented,
901 * but it's not worth the time; just let them time out.)
903 if (ip
->ip_off
& (IP_MF
| IP_OFFMASK
)) {
905 * Attempt reassembly; if it succeeds, proceed. ip_reass()
906 * will return a different mbuf.
908 * NOTE: ip_reass() returns m with M_HASH cleared to force
909 * us to recharacterize the packet.
914 ip
= mtod(m
, struct ip
*);
916 /* Get the header length of the reassembled packet */
917 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
924 * enforce IPsec policy checking if we are seeing last header.
925 * note that we do not visit this with protocols with pcb layer
926 * code - like udp/tcp/raw ip.
928 if ((inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) &&
929 ipsec4_in_reject(m
, NULL
)) {
930 ipsecstat
.in_polvio
++;
936 * enforce IPsec policy checking if we are seeing last header.
937 * note that we do not visit this with protocols with pcb layer
938 * code - like udp/tcp/raw ip.
940 if (inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) {
942 * Check if the packet has already had IPsec processing
943 * done. If so, then just pass it along. This tag gets
944 * set during AH, ESP, etc. input handling, before the
945 * packet is returned to the ip input queue for delivery.
947 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
950 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
951 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
953 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
954 IP_FORWARDING
, &error
);
958 * Check security policy against packet attributes.
960 error
= ipsec_in_reject(sp
, m
);
963 /* XXX error stat??? */
965 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
973 #endif /* FAST_IPSEC */
976 * We must forward the packet to the correct protocol thread if
977 * we are not already in it.
979 * NOTE: ip_len is now in host form. ip_len is not adjusted
980 * further for protocol processing, instead we pass hlen
981 * to the protosw and let it deal with it.
983 ipstat
.ips_delivered
++;
985 if ((m
->m_flags
& M_HASH
) == 0) {
987 atomic_add_long(&ip_rehash_count
, 1);
989 ip
->ip_len
= htons(ip
->ip_len
+ hlen
);
990 ip
->ip_off
= htons(ip
->ip_off
);
996 ip
= mtod(m
, struct ip
*);
997 ip
->ip_len
= ntohs(ip
->ip_len
) - hlen
;
998 ip
->ip_off
= ntohs(ip
->ip_off
);
999 KKASSERT(m
->m_flags
& M_HASH
);
1001 port
= netisr_hashport(m
->m_pkthdr
.hash
);
1003 if (port
!= &curthread
->td_msgport
) {
1004 struct netmsg_packet
*pmsg
;
1007 atomic_add_long(&ip_dispatch_slow
, 1);
1010 pmsg
= &m
->m_hdr
.mh_netmsg
;
1011 netmsg_init(&pmsg
->base
, NULL
, &netisr_apanic_rport
,
1012 0, transport_processing_handler
);
1013 pmsg
->nm_packet
= m
;
1014 pmsg
->base
.lmsg
.u
.ms_result
= hlen
;
1015 lwkt_sendmsg(port
, &pmsg
->base
.lmsg
);
1018 atomic_add_long(&ip_dispatch_fast
, 1);
1020 transport_processing_oncpu(m
, hlen
, ip
);
1029 * Take incoming datagram fragment and try to reassemble it into
1030 * whole datagram. If a chain for reassembly of this datagram already
1031 * exists, then it is given as fp; otherwise have to make a chain.
1034 ip_reass(struct mbuf
*m
)
1036 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1037 struct ip
*ip
= mtod(m
, struct ip
*);
1038 struct mbuf
*p
= NULL
, *q
, *nq
;
1040 struct ipq
*fp
= NULL
;
1041 struct ipqhead
*head
;
1042 int hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
1046 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
1047 if (maxnipq
== 0 || maxfragsperpacket
== 0) {
1048 ipstat
.ips_fragments
++;
1049 ipstat
.ips_fragdropped
++;
1054 sum
= IPREASS_HASH(ip
->ip_src
.s_addr
, ip
->ip_id
);
1056 * Look for queue of fragments of this datagram.
1058 head
= &fragq
->ipq
[sum
];
1059 TAILQ_FOREACH(fp
, head
, ipq_list
) {
1060 if (ip
->ip_id
== fp
->ipq_id
&&
1061 ip
->ip_src
.s_addr
== fp
->ipq_src
.s_addr
&&
1062 ip
->ip_dst
.s_addr
== fp
->ipq_dst
.s_addr
&&
1063 ip
->ip_p
== fp
->ipq_p
)
1070 * Enforce upper bound on number of fragmented packets
1071 * for which we attempt reassembly;
1072 * If maxnipq is -1, accept all fragments without limitation.
1074 if (fragq
->nipq
> maxnipq
&& maxnipq
> 0) {
1076 * drop something from the tail of the current queue
1077 * before proceeding further
1079 struct ipq
*q
= TAILQ_LAST(head
, ipqhead
);
1082 * The current queue is empty,
1083 * so drop from one of the others.
1085 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1086 struct ipq
*r
= TAILQ_LAST(&fragq
->ipq
[i
],
1089 ipstat
.ips_fragtimeout
+= r
->ipq_nfrags
;
1090 ip_freef(fragq
, &fragq
->ipq
[i
], r
);
1095 ipstat
.ips_fragtimeout
+= q
->ipq_nfrags
;
1096 ip_freef(fragq
, head
, q
);
1101 * Adjust ip_len to not reflect header,
1102 * convert offset of this to bytes.
1105 if (ip
->ip_off
& IP_MF
) {
1107 * Make sure that fragments have a data length
1108 * that's a non-zero multiple of 8 bytes.
1110 if (ip
->ip_len
== 0 || (ip
->ip_len
& 0x7) != 0) {
1111 ipstat
.ips_toosmall
++; /* XXX */
1115 m
->m_flags
|= M_FRAG
;
1117 m
->m_flags
&= ~M_FRAG
;
1121 ipstat
.ips_fragments
++;
1122 m
->m_pkthdr
.header
= ip
;
1125 * If the hardware has not done csum over this fragment
1126 * then csum_data is not valid at all.
1128 if ((m
->m_pkthdr
.csum_flags
& (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
))
1129 == (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
)) {
1130 m
->m_pkthdr
.csum_data
= 0;
1131 m
->m_pkthdr
.csum_flags
&= ~(CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
1135 * Presence of header sizes in mbufs
1136 * would confuse code below.
1142 * If first fragment to arrive, create a reassembly queue.
1145 if ((fp
= mpipe_alloc_nowait(&ipq_mpipe
)) == NULL
)
1147 TAILQ_INSERT_HEAD(head
, fp
, ipq_list
);
1150 fp
->ipq_ttl
= IPFRAGTTL
;
1151 fp
->ipq_p
= ip
->ip_p
;
1152 fp
->ipq_id
= ip
->ip_id
;
1153 fp
->ipq_src
= ip
->ip_src
;
1154 fp
->ipq_dst
= ip
->ip_dst
;
1156 m
->m_nextpkt
= NULL
;
1161 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
1164 * Find a segment which begins after this one does.
1166 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1167 if (GETIP(q
)->ip_off
> ip
->ip_off
)
1172 * If there is a preceding segment, it may provide some of
1173 * our data already. If so, drop the data from the incoming
1174 * segment. If it provides all of our data, drop us, otherwise
1175 * stick new segment in the proper place.
1177 * If some of the data is dropped from the the preceding
1178 * segment, then it's checksum is invalidated.
1181 i
= GETIP(p
)->ip_off
+ GETIP(p
)->ip_len
- ip
->ip_off
;
1183 if (i
>= ip
->ip_len
)
1186 m
->m_pkthdr
.csum_flags
= 0;
1190 m
->m_nextpkt
= p
->m_nextpkt
;
1193 m
->m_nextpkt
= fp
->ipq_frags
;
1198 * While we overlap succeeding segments trim them or,
1199 * if they are completely covered, dequeue them.
1201 for (; q
!= NULL
&& ip
->ip_off
+ ip
->ip_len
> GETIP(q
)->ip_off
;
1203 i
= (ip
->ip_off
+ ip
->ip_len
) - GETIP(q
)->ip_off
;
1204 if (i
< GETIP(q
)->ip_len
) {
1205 GETIP(q
)->ip_len
-= i
;
1206 GETIP(q
)->ip_off
+= i
;
1208 q
->m_pkthdr
.csum_flags
= 0;
1213 ipstat
.ips_fragdropped
++;
1215 q
->m_nextpkt
= NULL
;
1221 * Check for complete reassembly and perform frag per packet
1224 * Frag limiting is performed here so that the nth frag has
1225 * a chance to complete the packet before we drop the packet.
1226 * As a result, n+1 frags are actually allowed per packet, but
1227 * only n will ever be stored. (n = maxfragsperpacket.)
1231 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1232 if (GETIP(q
)->ip_off
!= next
) {
1233 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1234 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1235 ip_freef(fragq
, head
, fp
);
1239 next
+= GETIP(q
)->ip_len
;
1241 /* Make sure the last packet didn't have the IP_MF flag */
1242 if (p
->m_flags
& M_FRAG
) {
1243 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1244 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1245 ip_freef(fragq
, head
, fp
);
1251 * Reassembly is complete. Make sure the packet is a sane size.
1255 if (next
+ (IP_VHL_HL(ip
->ip_vhl
) << 2) > IP_MAXPACKET
) {
1256 ipstat
.ips_toolong
++;
1257 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1258 ip_freef(fragq
, head
, fp
);
1263 * Concatenate fragments.
1270 q
->m_nextpkt
= NULL
;
1271 for (q
= nq
; q
!= NULL
; q
= nq
) {
1273 q
->m_nextpkt
= NULL
;
1274 m
->m_pkthdr
.csum_flags
&= q
->m_pkthdr
.csum_flags
;
1275 m
->m_pkthdr
.csum_data
+= q
->m_pkthdr
.csum_data
;
1280 * Clean up the 1's complement checksum. Carry over 16 bits must
1281 * be added back. This assumes no more then 65535 packet fragments
1282 * were reassembled. A second carry can also occur (but not a third).
1284 m
->m_pkthdr
.csum_data
= (m
->m_pkthdr
.csum_data
& 0xffff) +
1285 (m
->m_pkthdr
.csum_data
>> 16);
1286 if (m
->m_pkthdr
.csum_data
> 0xFFFF)
1287 m
->m_pkthdr
.csum_data
-= 0xFFFF;
1290 * Create header for new ip packet by
1291 * modifying header of first packet;
1292 * dequeue and discard fragment reassembly header.
1293 * Make header visible.
1296 ip
->ip_src
= fp
->ipq_src
;
1297 ip
->ip_dst
= fp
->ipq_dst
;
1298 TAILQ_REMOVE(head
, fp
, ipq_list
);
1300 mpipe_free(&ipq_mpipe
, fp
);
1301 m
->m_len
+= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1302 m
->m_data
-= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1303 /* some debugging cruft by sklower, below, will go away soon */
1304 if (m
->m_flags
& M_PKTHDR
) { /* XXX this should be done elsewhere */
1307 for (n
= m
; n
; n
= n
->m_next
)
1309 m
->m_pkthdr
.len
= plen
;
1313 * Reassembly complete, return the next protocol.
1315 * Be sure to clear M_HASH to force the packet
1316 * to be re-characterized.
1318 * Clear M_FRAG, we are no longer a fragment.
1320 m
->m_flags
&= ~(M_HASH
| M_FRAG
);
1322 ipstat
.ips_reassembled
++;
1326 ipstat
.ips_fragdropped
++;
1337 * Free a fragment reassembly header and all
1338 * associated datagrams.
1341 ip_freef(struct ipfrag_queue
*fragq
, struct ipqhead
*fhp
, struct ipq
*fp
)
1346 * Remove first to protect against blocking
1348 TAILQ_REMOVE(fhp
, fp
, ipq_list
);
1351 * Clean out at our leisure
1353 while (fp
->ipq_frags
) {
1355 fp
->ipq_frags
= q
->m_nextpkt
;
1356 q
->m_nextpkt
= NULL
;
1359 mpipe_free(&ipq_mpipe
, fp
);
1364 * If a timer expires on a reassembly queue, discard it.
1367 ipfrag_timeo_dispatch(netmsg_t nmsg
)
1369 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1370 struct ipq
*fp
, *fp_temp
;
1371 struct ipqhead
*head
;
1375 netisr_replymsg(&nmsg
->base
, 0); /* reply ASAP */
1378 if (fragq
->nipq
== 0)
1381 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1382 head
= &fragq
->ipq
[i
];
1383 TAILQ_FOREACH_MUTABLE(fp
, head
, ipq_list
, fp_temp
) {
1384 if (--fp
->ipq_ttl
== 0) {
1385 ipstat
.ips_fragtimeout
+= fp
->ipq_nfrags
;
1386 ip_freef(fragq
, head
, fp
);
1391 * If we are over the maximum number of fragments
1392 * (due to the limit being lowered), drain off
1393 * enough to get down to the new limit.
1395 if (maxnipq
>= 0 && fragq
->nipq
> maxnipq
) {
1396 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1397 head
= &fragq
->ipq
[i
];
1398 while (fragq
->nipq
> maxnipq
&& !TAILQ_EMPTY(head
)) {
1399 ipstat
.ips_fragdropped
+=
1400 TAILQ_FIRST(head
)->ipq_nfrags
;
1401 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1406 callout_reset(&fragq
->timeo_ch
, IPFRAG_TIMEO
, ipfrag_timeo
, NULL
);
1410 ipfrag_timeo(void *dummy __unused
)
1412 struct netmsg_base
*msg
= &ipfrag_queue_pcpu
[mycpuid
].timeo_netmsg
;
1415 if (msg
->lmsg
.ms_flags
& MSGF_DONE
)
1416 netisr_sendmsg_oncpu(msg
);
1421 * Drain off all datagram fragments.
1424 ipfrag_drain_oncpu(struct ipfrag_queue
*fragq
)
1426 struct ipqhead
*head
;
1429 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1430 head
= &fragq
->ipq
[i
];
1431 while (!TAILQ_EMPTY(head
)) {
1432 ipstat
.ips_fragdropped
+= TAILQ_FIRST(head
)->ipq_nfrags
;
1433 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1439 ipfrag_drain_dispatch(netmsg_t nmsg
)
1441 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1444 lwkt_replymsg(&nmsg
->lmsg
, 0); /* reply ASAP */
1447 ipfrag_drain_oncpu(fragq
);
1448 fragq
->draining
= 0;
1452 ipfrag_drain_ipi(void *arg __unused
)
1455 struct lwkt_msg
*msg
= &ipfrag_queue_pcpu
[cpu
].drain_netmsg
.lmsg
;
1458 if (msg
->ms_flags
& MSGF_DONE
)
1459 lwkt_sendmsg_oncpu(netisr_cpuport(cpu
), msg
);
1469 CPUMASK_ASSBMASK(mask
, netisr_ncpus
);
1470 CPUMASK_ANDMASK(mask
, smp_active_mask
);
1472 if (IN_NETISR_NCPUS(mycpuid
)) {
1473 ipfrag_drain_oncpu(&ipfrag_queue_pcpu
[mycpuid
]);
1474 CPUMASK_NANDBIT(mask
, mycpuid
);
1477 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
1478 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[cpu
];
1480 if (!CPUMASK_TESTBIT(mask
, cpu
))
1483 if (fragq
->nipq
== 0 || fragq
->draining
) {
1484 /* No fragments or is draining; skip this cpu. */
1485 CPUMASK_NANDBIT(mask
, cpu
);
1488 fragq
->draining
= 1;
1491 if (CPUMASK_TESTNZERO(mask
))
1492 lwkt_send_ipiq_mask(mask
, ipfrag_drain_ipi
, NULL
);
1503 * Do option processing on a datagram,
1504 * possibly discarding it if bad options are encountered,
1505 * or forwarding it if source-routed.
1506 * The pass argument is used when operating in the IPSTEALTH
1507 * mode to tell what options to process:
1508 * [LS]SRR (pass 0) or the others (pass 1).
1509 * The reason for as many as two passes is that when doing IPSTEALTH,
1510 * non-routing options should be processed only if the packet is for us.
1511 * Returns 1 if packet has been forwarded/freed,
1512 * 0 if the packet should be processed further.
1515 ip_dooptions(struct mbuf
*m
, int pass
, struct sockaddr_in
*next_hop
)
1517 struct sockaddr_in ipaddr
= { sizeof ipaddr
, AF_INET
};
1518 struct ip
*ip
= mtod(m
, struct ip
*);
1520 struct in_ifaddr
*ia
;
1521 int opt
, optlen
, cnt
, off
, code
, type
= ICMP_PARAMPROB
;
1522 boolean_t forward
= FALSE
;
1523 struct in_addr
*sin
, dst
;
1527 cp
= (u_char
*)(ip
+ 1);
1528 cnt
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1529 for (; cnt
> 0; cnt
-= optlen
, cp
+= optlen
) {
1530 opt
= cp
[IPOPT_OPTVAL
];
1531 if (opt
== IPOPT_EOL
)
1533 if (opt
== IPOPT_NOP
)
1536 if (cnt
< IPOPT_OLEN
+ sizeof(*cp
)) {
1537 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1540 optlen
= cp
[IPOPT_OLEN
];
1541 if (optlen
< IPOPT_OLEN
+ sizeof(*cp
) || optlen
> cnt
) {
1542 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1552 * Source routing with record.
1553 * Find interface with current destination address.
1554 * If none on this machine then drop if strictly routed,
1555 * or do nothing if loosely routed.
1556 * Record interface address and bring up next address
1557 * component. If strictly routed make sure next
1558 * address is on directly accessible net.
1562 if (ipstealth
&& pass
> 0)
1564 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1565 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1568 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1569 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1572 ipaddr
.sin_addr
= ip
->ip_dst
;
1573 ia
= (struct in_ifaddr
*)
1574 ifa_ifwithaddr((struct sockaddr
*)&ipaddr
);
1576 if (opt
== IPOPT_SSRR
) {
1577 type
= ICMP_UNREACH
;
1578 code
= ICMP_UNREACH_SRCFAIL
;
1581 if (!ip_dosourceroute
)
1582 goto nosourcerouting
;
1584 * Loose routing, and not at next destination
1585 * yet; nothing to do except forward.
1589 off
--; /* 0 origin */
1590 if (off
> optlen
- (int)sizeof(struct in_addr
)) {
1592 * End of source route. Should be for us.
1594 if (!ip_acceptsourceroute
)
1595 goto nosourcerouting
;
1596 save_rte(m
, cp
, ip
->ip_src
);
1601 if (!ip_dosourceroute
) {
1603 char sbuf
[INET_ADDRSTRLEN
];
1604 char dbuf
[INET_ADDRSTRLEN
];
1607 * Acting as a router, so generate ICMP
1611 "attempted source route from %s to %s\n",
1612 kinet_ntoa(ip
->ip_src
, sbuf
),
1613 kinet_ntoa(ip
->ip_dst
, dbuf
));
1614 type
= ICMP_UNREACH
;
1615 code
= ICMP_UNREACH_SRCFAIL
;
1619 * Not acting as a router,
1623 ipstat
.ips_cantforward
++;
1630 * locate outgoing interface
1632 memcpy(&ipaddr
.sin_addr
, cp
+ off
,
1633 sizeof ipaddr
.sin_addr
);
1635 if (opt
== IPOPT_SSRR
) {
1636 #define INA struct in_ifaddr *
1637 #define SA struct sockaddr *
1638 if ((ia
= (INA
)ifa_ifwithdstaddr((SA
)&ipaddr
))
1640 ia
= (INA
)ifa_ifwithnet((SA
)&ipaddr
);
1642 ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
);
1645 type
= ICMP_UNREACH
;
1646 code
= ICMP_UNREACH_SRCFAIL
;
1649 ip
->ip_dst
= ipaddr
.sin_addr
;
1650 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1651 sizeof(struct in_addr
));
1652 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1654 * Let ip_intr's mcast routing check handle mcast pkts
1656 forward
= !IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
));
1660 if (ipstealth
&& pass
== 0)
1662 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1663 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1666 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1667 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1671 * If no space remains, ignore.
1673 off
--; /* 0 origin */
1674 if (off
> optlen
- (int)sizeof(struct in_addr
))
1676 memcpy(&ipaddr
.sin_addr
, &ip
->ip_dst
,
1677 sizeof ipaddr
.sin_addr
);
1679 * locate outgoing interface; if we're the destination,
1680 * use the incoming interface (should be same).
1682 if ((ia
= (INA
)ifa_ifwithaddr((SA
)&ipaddr
)) == NULL
&&
1683 (ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
)) == NULL
) {
1684 type
= ICMP_UNREACH
;
1685 code
= ICMP_UNREACH_HOST
;
1688 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1689 sizeof(struct in_addr
));
1690 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1694 if (ipstealth
&& pass
== 0)
1696 code
= cp
- (u_char
*)ip
;
1697 if (optlen
< 4 || optlen
> 40) {
1698 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1701 if ((off
= cp
[IPOPT_OFFSET
]) < 5) {
1702 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1705 if (off
> optlen
- (int)sizeof(int32_t)) {
1706 cp
[IPOPT_OFFSET
+ 1] += (1 << 4);
1707 if ((cp
[IPOPT_OFFSET
+ 1] & 0xf0) == 0) {
1708 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1713 off
--; /* 0 origin */
1714 sin
= (struct in_addr
*)(cp
+ off
);
1715 switch (cp
[IPOPT_OFFSET
+ 1] & 0x0f) {
1717 case IPOPT_TS_TSONLY
:
1720 case IPOPT_TS_TSANDADDR
:
1721 if (off
+ sizeof(n_time
) +
1722 sizeof(struct in_addr
) > optlen
) {
1723 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1726 ipaddr
.sin_addr
= dst
;
1727 ia
= (INA
)ifaof_ifpforaddr((SA
)&ipaddr
,
1731 memcpy(sin
, &IA_SIN(ia
)->sin_addr
,
1732 sizeof(struct in_addr
));
1733 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1734 off
+= sizeof(struct in_addr
);
1737 case IPOPT_TS_PRESPEC
:
1738 if (off
+ sizeof(n_time
) +
1739 sizeof(struct in_addr
) > optlen
) {
1740 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1743 memcpy(&ipaddr
.sin_addr
, sin
,
1744 sizeof(struct in_addr
));
1745 if (ifa_ifwithaddr((SA
)&ipaddr
) == NULL
)
1747 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1748 off
+= sizeof(struct in_addr
);
1752 code
= &cp
[IPOPT_OFFSET
+ 1] - (u_char
*)ip
;
1756 memcpy(cp
+ off
, &ntime
, sizeof(n_time
));
1757 cp
[IPOPT_OFFSET
] += sizeof(n_time
);
1760 if (forward
&& ipforwarding
) {
1761 ip_forward(m
, TRUE
, next_hop
);
1766 icmp_error(m
, type
, code
, 0, 0);
1767 ipstat
.ips_badoptions
++;
1772 * Given address of next destination (final or next hop),
1773 * return internet address info of interface to be used to get there.
1776 ip_rtaddr(struct in_addr dst
, struct route
*ro0
)
1778 struct route sro
, *ro
;
1779 struct sockaddr_in
*sin
;
1780 struct in_ifaddr
*ia
;
1785 bzero(&sro
, sizeof(sro
));
1789 sin
= (struct sockaddr_in
*)&ro
->ro_dst
;
1791 if (ro
->ro_rt
== NULL
|| dst
.s_addr
!= sin
->sin_addr
.s_addr
) {
1792 if (ro
->ro_rt
!= NULL
) {
1796 sin
->sin_family
= AF_INET
;
1797 sin
->sin_len
= sizeof *sin
;
1798 sin
->sin_addr
= dst
;
1799 rtalloc_ign(ro
, RTF_PRCLONING
);
1802 if (ro
->ro_rt
== NULL
)
1805 ia
= ifatoia(ro
->ro_rt
->rt_ifa
);
1813 * Save incoming source route for use in replies,
1814 * to be picked up later by ip_srcroute if the receiver is interested.
1817 save_rte(struct mbuf
*m
, u_char
*option
, struct in_addr dst
)
1820 struct ip_srcrt_opt
*opt
;
1823 mtag
= m_tag_get(PACKET_TAG_IPSRCRT
, sizeof(*opt
), M_NOWAIT
);
1826 opt
= m_tag_data(mtag
);
1828 olen
= option
[IPOPT_OLEN
];
1831 kprintf("save_rte: olen %d\n", olen
);
1833 if (olen
> sizeof(opt
->ip_srcrt
) - (1 + sizeof(dst
))) {
1837 bcopy(option
, opt
->ip_srcrt
.srcopt
, olen
);
1838 opt
->ip_nhops
= (olen
- IPOPT_OFFSET
- 1) / sizeof(struct in_addr
);
1839 opt
->ip_srcrt
.dst
= dst
;
1840 m_tag_prepend(m
, mtag
);
1844 * Retrieve incoming source route for use in replies,
1845 * in the same form used by setsockopt.
1846 * The first hop is placed before the options, will be removed later.
1849 ip_srcroute(struct mbuf
*m0
)
1851 struct in_addr
*p
, *q
;
1854 struct ip_srcrt_opt
*opt
;
1859 mtag
= m_tag_find(m0
, PACKET_TAG_IPSRCRT
, NULL
);
1862 opt
= m_tag_data(mtag
);
1864 if (opt
->ip_nhops
== 0)
1866 m
= m_get(M_NOWAIT
, MT_HEADER
);
1870 #define OPTSIZ (sizeof(opt->ip_srcrt.nop) + sizeof(opt->ip_srcrt.srcopt))
1872 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1873 m
->m_len
= opt
->ip_nhops
* sizeof(struct in_addr
) +
1874 sizeof(struct in_addr
) + OPTSIZ
;
1877 kprintf("ip_srcroute: nhops %d mlen %d",
1878 opt
->ip_nhops
, m
->m_len
);
1883 * First save first hop for return route
1885 p
= &opt
->ip_srcrt
.route
[opt
->ip_nhops
- 1];
1886 *(mtod(m
, struct in_addr
*)) = *p
--;
1889 kprintf(" hops %x", ntohl(mtod(m
, struct in_addr
*)->s_addr
));
1893 * Copy option fields and padding (nop) to mbuf.
1895 opt
->ip_srcrt
.nop
= IPOPT_NOP
;
1896 opt
->ip_srcrt
.srcopt
[IPOPT_OFFSET
] = IPOPT_MINOFF
;
1897 memcpy(mtod(m
, caddr_t
) + sizeof(struct in_addr
), &opt
->ip_srcrt
.nop
,
1899 q
= (struct in_addr
*)(mtod(m
, caddr_t
) +
1900 sizeof(struct in_addr
) + OPTSIZ
);
1903 * Record return path as an IP source route,
1904 * reversing the path (pointers are now aligned).
1906 while (p
>= opt
->ip_srcrt
.route
) {
1909 kprintf(" %x", ntohl(q
->s_addr
));
1914 * Last hop goes to final destination.
1916 *q
= opt
->ip_srcrt
.dst
;
1917 m_tag_delete(m0
, mtag
);
1920 kprintf(" %x\n", ntohl(q
->s_addr
));
1926 * Strip out IP options.
1929 ip_stripoptions(struct mbuf
*m
)
1932 struct ip
*ip
= mtod(m
, struct ip
*);
1936 optlen
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1937 opts
= (caddr_t
)(ip
+ 1);
1938 datalen
= m
->m_len
- (sizeof(struct ip
) + optlen
);
1939 bcopy(opts
+ optlen
, opts
, datalen
);
1941 if (m
->m_flags
& M_PKTHDR
)
1942 m
->m_pkthdr
.len
-= optlen
;
1943 ip
->ip_vhl
= IP_MAKE_VHL(IPVERSION
, sizeof(struct ip
) >> 2);
1946 u_char inetctlerrmap
[PRC_NCMDS
] = {
1948 0, EMSGSIZE
, EHOSTDOWN
, EHOSTUNREACH
,
1949 EHOSTUNREACH
, EHOSTUNREACH
, ECONNREFUSED
, ECONNREFUSED
,
1950 EMSGSIZE
, EHOSTUNREACH
, 0, 0,
1952 ENOPROTOOPT
, ECONNREFUSED
1956 * Forward a packet. If some error occurs return the sender
1957 * an icmp packet. Note we can't always generate a meaningful
1958 * icmp message because icmp doesn't have a large enough repertoire
1959 * of codes and types.
1961 * If not forwarding, just drop the packet. This could be confusing
1962 * if ipforwarding was zero but some routing protocol was advancing
1963 * us as a gateway to somewhere. However, we must let the routing
1964 * protocol deal with that.
1966 * The using_srcrt parameter indicates whether the packet is being forwarded
1967 * via a source route.
1970 ip_forward(struct mbuf
*m
, boolean_t using_srcrt
, struct sockaddr_in
*next_hop
)
1972 struct ip
*ip
= mtod(m
, struct ip
*);
1974 struct route fwd_ro
;
1975 int error
, type
= 0, code
= 0, destmtu
= 0;
1976 struct mbuf
*mcopy
, *mtemp
= NULL
;
1978 struct in_addr pkt_dst
;
1982 * Cache the destination address of the packet; this may be
1983 * changed by use of 'ipfw fwd'.
1985 pkt_dst
= (next_hop
!= NULL
) ? next_hop
->sin_addr
: ip
->ip_dst
;
1989 kprintf("forward: src %x dst %x ttl %x\n",
1990 ip
->ip_src
.s_addr
, pkt_dst
.s_addr
, ip
->ip_ttl
);
1993 if (m
->m_flags
& (M_BCAST
| M_MCAST
) || !in_canforward(pkt_dst
)) {
1994 ipstat
.ips_cantforward
++;
1998 if (!ipstealth
&& ip
->ip_ttl
<= IPTTLDEC
) {
1999 icmp_error(m
, ICMP_TIMXCEED
, ICMP_TIMXCEED_INTRANS
, dest
, 0);
2003 bzero(&fwd_ro
, sizeof(fwd_ro
));
2004 ip_rtaddr(pkt_dst
, &fwd_ro
);
2005 if (fwd_ro
.ro_rt
== NULL
) {
2006 icmp_error(m
, ICMP_UNREACH
, ICMP_UNREACH_HOST
, dest
, 0);
2011 if (curthread
->td_type
== TD_TYPE_NETISR
) {
2013 * Save the IP header and at most 8 bytes of the payload,
2014 * in case we need to generate an ICMP message to the src.
2016 mtemp
= ipforward_mtemp
[mycpuid
];
2017 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2018 mtemp
->m_data
== mtemp
->m_pktdat
&&
2019 m_tag_first(mtemp
) == NULL
,
2020 ("ip_forward invalid mtemp1"));
2022 if (!m_dup_pkthdr(mtemp
, m
, M_NOWAIT
)) {
2024 * It's probably ok if the pkthdr dup fails (because
2025 * the deep copy of the tag chain failed), but for now
2026 * be conservative and just discard the copy since
2027 * code below may some day want the tags.
2031 mtemp
->m_type
= m
->m_type
;
2032 mtemp
->m_len
= imin((IP_VHL_HL(ip
->ip_vhl
) << 2) + 8,
2034 mtemp
->m_pkthdr
.len
= mtemp
->m_len
;
2035 m_copydata(m
, 0, mtemp
->m_len
, mtod(mtemp
, caddr_t
));
2040 ip
->ip_ttl
-= IPTTLDEC
;
2043 * If forwarding packet using same interface that it came in on,
2044 * perhaps should send a redirect to sender to shortcut a hop.
2045 * Only send redirect if source is sending directly to us,
2046 * and if packet was not source routed (or has any options).
2047 * Also, don't send redirect if forwarding using a default route
2048 * or a route modified by a redirect.
2050 if (rt
->rt_ifp
== m
->m_pkthdr
.rcvif
&&
2051 !(rt
->rt_flags
& (RTF_DYNAMIC
| RTF_MODIFIED
)) &&
2052 satosin(rt_key(rt
))->sin_addr
.s_addr
!= INADDR_ANY
&&
2053 ipsendredirects
&& !using_srcrt
&& next_hop
== NULL
) {
2054 u_long src
= ntohl(ip
->ip_src
.s_addr
);
2055 struct in_ifaddr
*rt_ifa
= (struct in_ifaddr
*)rt
->rt_ifa
;
2057 if (rt_ifa
!= NULL
&&
2058 (src
& rt_ifa
->ia_subnetmask
) == rt_ifa
->ia_subnet
) {
2059 if (rt
->rt_flags
& RTF_GATEWAY
)
2060 dest
= satosin(rt
->rt_gateway
)->sin_addr
.s_addr
;
2062 dest
= pkt_dst
.s_addr
;
2064 * Router requirements says to only send
2067 type
= ICMP_REDIRECT
;
2068 code
= ICMP_REDIRECT_HOST
;
2071 kprintf("redirect (%d) to %x\n", code
, dest
);
2076 error
= ip_output(m
, NULL
, &fwd_ro
, IP_FORWARDING
, NULL
, NULL
);
2078 ipstat
.ips_forward
++;
2081 ipflow_create(&fwd_ro
, mtemp
);
2084 ipstat
.ips_redirectsent
++;
2086 ipstat
.ips_cantforward
++;
2093 * Errors that do not require generating ICMP message
2098 * A router should not generate ICMP_SOURCEQUENCH as
2099 * required in RFC1812 Requirements for IP Version 4 Routers.
2100 * Source quench could be a big problem under DoS attacks,
2101 * or if the underlying interface is rate-limited.
2102 * Those who need source quench packets may re-enable them
2103 * via the net.inet.ip.sendsourcequench sysctl.
2105 if (!ip_sendsourcequench
)
2109 case EACCES
: /* ipfw denied packet */
2113 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2114 mtemp
->m_data
== mtemp
->m_pktdat
,
2115 ("ip_forward invalid mtemp2"));
2116 mcopy
= m_copym(mtemp
, 0, mtemp
->m_len
, M_NOWAIT
);
2121 * Send ICMP message.
2124 case 0: /* forwarded, but need redirect */
2125 /* type, code set above */
2128 case ENETUNREACH
: /* shouldn't happen, checked above */
2133 type
= ICMP_UNREACH
;
2134 code
= ICMP_UNREACH_HOST
;
2138 type
= ICMP_UNREACH
;
2139 code
= ICMP_UNREACH_NEEDFRAG
;
2142 * If the packet is routed over IPsec tunnel, tell the
2143 * originator the tunnel MTU.
2144 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2147 if (fwd_ro
.ro_rt
!= NULL
) {
2148 struct secpolicy
*sp
= NULL
;
2153 sp
= ipsec4_getpolicybyaddr(mcopy
,
2159 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2161 /* count IPsec header size */
2162 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2167 * find the correct route for outer IPv4
2168 * header, compute tunnel MTU.
2171 if (sp
->req
!= NULL
&& sp
->req
->sav
!= NULL
&&
2172 sp
->req
->sav
->sah
!= NULL
) {
2173 ro
= &sp
->req
->sav
->sah
->sa_route
;
2174 if (ro
->ro_rt
!= NULL
&&
2175 ro
->ro_rt
->rt_ifp
!= NULL
) {
2177 ro
->ro_rt
->rt_ifp
->if_mtu
;
2178 destmtu
-= ipsechdr
;
2185 #elif defined(FAST_IPSEC)
2187 * If the packet is routed over IPsec tunnel, tell the
2188 * originator the tunnel MTU.
2189 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2192 if (fwd_ro
.ro_rt
!= NULL
) {
2193 struct secpolicy
*sp
= NULL
;
2198 sp
= ipsec_getpolicybyaddr(mcopy
,
2204 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2206 /* count IPsec header size */
2207 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2212 * find the correct route for outer IPv4
2213 * header, compute tunnel MTU.
2216 if (sp
->req
!= NULL
&&
2217 sp
->req
->sav
!= NULL
&&
2218 sp
->req
->sav
->sah
!= NULL
) {
2219 ro
= &sp
->req
->sav
->sah
->sa_route
;
2220 if (ro
->ro_rt
!= NULL
&&
2221 ro
->ro_rt
->rt_ifp
!= NULL
) {
2223 ro
->ro_rt
->rt_ifp
->if_mtu
;
2224 destmtu
-= ipsechdr
;
2231 #else /* !IPSEC && !FAST_IPSEC */
2232 if (fwd_ro
.ro_rt
!= NULL
)
2233 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2235 ipstat
.ips_cantfrag
++;
2239 type
= ICMP_SOURCEQUENCH
;
2243 case EACCES
: /* ipfw denied packet */
2244 panic("ip_forward EACCES should not reach");
2246 icmp_error(mcopy
, type
, code
, dest
, destmtu
);
2249 m_tag_delete_chain(mtemp
);
2250 if (fwd_ro
.ro_rt
!= NULL
)
2251 RTFREE(fwd_ro
.ro_rt
);
2255 ip_savecontrol(struct inpcb
*inp
, struct mbuf
**mp
, struct ip
*ip
,
2258 if (inp
->inp_socket
->so_options
& SO_TIMESTAMP
) {
2262 *mp
= sbcreatecontrol((caddr_t
) &tv
, sizeof(tv
),
2263 SCM_TIMESTAMP
, SOL_SOCKET
);
2265 mp
= &(*mp
)->m_next
;
2267 if (inp
->inp_flags
& INP_RECVDSTADDR
) {
2268 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_dst
,
2269 sizeof(struct in_addr
), IP_RECVDSTADDR
, IPPROTO_IP
);
2271 mp
= &(*mp
)->m_next
;
2273 if (inp
->inp_flags
& INP_RECVTTL
) {
2274 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_ttl
,
2275 sizeof(u_char
), IP_RECVTTL
, IPPROTO_IP
);
2277 mp
= &(*mp
)->m_next
;
2281 * Moving these out of udp_input() made them even more broken
2282 * than they already were.
2284 /* options were tossed already */
2285 if (inp
->inp_flags
& INP_RECVOPTS
) {
2286 *mp
= sbcreatecontrol((caddr_t
) opts_deleted_above
,
2287 sizeof(struct in_addr
), IP_RECVOPTS
, IPPROTO_IP
);
2289 mp
= &(*mp
)->m_next
;
2291 /* ip_srcroute doesn't do what we want here, need to fix */
2292 if (inp
->inp_flags
& INP_RECVRETOPTS
) {
2293 *mp
= sbcreatecontrol((caddr_t
) ip_srcroute(m
),
2294 sizeof(struct in_addr
), IP_RECVRETOPTS
, IPPROTO_IP
);
2296 mp
= &(*mp
)->m_next
;
2299 if (inp
->inp_flags
& INP_RECVIF
) {
2302 struct sockaddr_dl sdl
;
2305 struct sockaddr_dl
*sdp
;
2306 struct sockaddr_dl
*sdl2
= &sdlbuf
.sdl
;
2308 if (((ifp
= m
->m_pkthdr
.rcvif
)) &&
2309 ((ifp
->if_index
!= 0) && (ifp
->if_index
<= if_index
))) {
2310 sdp
= IF_LLSOCKADDR(ifp
);
2312 * Change our mind and don't try copy.
2314 if ((sdp
->sdl_family
!= AF_LINK
) ||
2315 (sdp
->sdl_len
> sizeof(sdlbuf
))) {
2318 bcopy(sdp
, sdl2
, sdp
->sdl_len
);
2322 offsetof(struct sockaddr_dl
, sdl_data
[0]);
2323 sdl2
->sdl_family
= AF_LINK
;
2324 sdl2
->sdl_index
= 0;
2325 sdl2
->sdl_nlen
= sdl2
->sdl_alen
= sdl2
->sdl_slen
= 0;
2327 *mp
= sbcreatecontrol((caddr_t
) sdl2
, sdl2
->sdl_len
,
2328 IP_RECVIF
, IPPROTO_IP
);
2330 mp
= &(*mp
)->m_next
;
2335 * XXX these routines are called from the upper part of the kernel.
2337 * They could also be moved to ip_mroute.c, since all the RSVP
2338 * handling is done there already.
2341 ip_rsvp_init(struct socket
*so
)
2343 if (so
->so_type
!= SOCK_RAW
||
2344 so
->so_proto
->pr_protocol
!= IPPROTO_RSVP
)
2347 if (ip_rsvpd
!= NULL
)
2352 * This may seem silly, but we need to be sure we don't over-increment
2353 * the RSVP counter, in case something slips up.
2368 * This may seem silly, but we need to be sure we don't over-decrement
2369 * the RSVP counter, in case something slips up.
2379 rsvp_input(struct mbuf
**mp
, int *offp
, int proto
)
2381 struct mbuf
*m
= *mp
;
2385 if (rsvp_input_p
) { /* call the real one if loaded */
2387 rsvp_input_p(mp
, offp
, proto
);
2388 return(IPPROTO_DONE
);
2391 /* Can still get packets with rsvp_on = 0 if there is a local member
2392 * of the group to which the RSVP packet is addressed. But in this
2393 * case we want to throw the packet away.
2398 return(IPPROTO_DONE
);
2401 if (ip_rsvpd
!= NULL
) {
2403 rip_input(mp
, offp
, proto
);
2404 return(IPPROTO_DONE
);
2406 /* Drop the packet */
2408 return(IPPROTO_DONE
);