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
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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"
74 #include <sys/param.h>
75 #include <sys/systm.h>
77 #include <sys/malloc.h>
78 #include <sys/mpipe.h>
79 #include <sys/domain.h>
80 #include <sys/protosw.h>
81 #include <sys/socket.h>
83 #include <sys/globaldata.h>
84 #include <sys/thread.h>
85 #include <sys/kernel.h>
86 #include <sys/syslog.h>
87 #include <sys/sysctl.h>
88 #include <sys/in_cksum.h>
91 #include <sys/mplock2.h>
93 #include <machine/stdarg.h>
96 #include <net/if_types.h>
97 #include <net/if_var.h>
98 #include <net/if_dl.h>
100 #include <net/route.h>
101 #include <net/netisr2.h>
103 #include <netinet/in.h>
104 #include <netinet/in_systm.h>
105 #include <netinet/in_var.h>
106 #include <netinet/ip.h>
107 #include <netinet/in_pcb.h>
108 #include <netinet/ip_var.h>
109 #include <netinet/ip_icmp.h>
110 #include <netinet/ip_divert.h>
111 #include <netinet/ip_flow.h>
113 #include <sys/thread2.h>
114 #include <sys/msgport2.h>
115 #include <net/netmsg2.h>
117 #include <sys/socketvar.h>
119 #include <net/ipfw/ip_fw.h>
120 #include <net/dummynet/ip_dummynet.h>
122 __read_mostly
int rsvp_on
= 0;
123 __read_mostly
static int ip_rsvp_on
;
124 struct socket
*ip_rsvpd
;
126 __read_mostly
int ipforwarding
= 0;
127 SYSCTL_INT(_net_inet_ip
, IPCTL_FORWARDING
, forwarding
, CTLFLAG_RW
,
128 &ipforwarding
, 0, "Enable IP forwarding between interfaces");
130 __read_mostly
static int ipsendredirects
= 1; /* XXX */
131 SYSCTL_INT(_net_inet_ip
, IPCTL_SENDREDIRECTS
, redirect
, CTLFLAG_RW
,
132 &ipsendredirects
, 0, "Enable sending IP redirects");
134 __read_mostly
int ip_defttl
= IPDEFTTL
;
135 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFTTL
, ttl
, CTLFLAG_RW
,
136 &ip_defttl
, 0, "Maximum TTL on IP packets");
138 __read_mostly
static int ip_dosourceroute
= 0;
139 SYSCTL_INT(_net_inet_ip
, IPCTL_SOURCEROUTE
, sourceroute
, CTLFLAG_RW
,
140 &ip_dosourceroute
, 0, "Enable forwarding source routed IP packets");
142 __read_mostly
static int ip_acceptsourceroute
= 0;
143 SYSCTL_INT(_net_inet_ip
, IPCTL_ACCEPTSOURCEROUTE
, accept_sourceroute
,
144 CTLFLAG_RW
, &ip_acceptsourceroute
, 0,
145 "Enable accepting source routed IP packets");
147 __read_mostly
static int maxnipq
;
148 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragpackets
, CTLFLAG_RW
,
150 "Maximum number of IPv4 fragment reassembly queue entries");
152 __read_mostly
static int maxfragsperpacket
;
153 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragsperpacket
, CTLFLAG_RW
,
154 &maxfragsperpacket
, 0,
155 "Maximum number of IPv4 fragments allowed per packet");
157 __read_mostly
static int ip_sendsourcequench
= 0;
158 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, sendsourcequench
, CTLFLAG_RW
,
159 &ip_sendsourcequench
, 0,
160 "Enable the transmission of source quench packets");
162 __read_mostly
int ip_do_randomid
= 1;
163 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, random_id
, CTLFLAG_RW
,
165 "Assign random ip_id values");
167 * XXX - Setting ip_checkinterface mostly implements the receive side of
168 * the Strong ES model described in RFC 1122, but since the routing table
169 * and transmit implementation do not implement the Strong ES model,
170 * setting this to 1 results in an odd hybrid.
172 * XXX - ip_checkinterface currently must be disabled if you use ipnat
173 * to translate the destination address to another local interface.
175 * XXX - ip_checkinterface must be disabled if you add IP aliases
176 * to the loopback interface instead of the interface where the
177 * packets for those addresses are received.
179 __read_mostly
static int ip_checkinterface
= 0;
180 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, check_interface
, CTLFLAG_RW
,
181 &ip_checkinterface
, 0, "Verify packet arrives on correct interface");
184 static u_long ip_rehash_count
= 0;
185 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, rehash_count
, CTLFLAG_RD
,
186 &ip_rehash_count
, 0, "Number of packets rehashed by IP");
188 static u_long ip_dispatch_fast
= 0;
189 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_fast_count
, CTLFLAG_RD
,
190 &ip_dispatch_fast
, 0, "Number of packets handled on current CPU");
192 static u_long ip_dispatch_slow
= 0;
193 SYSCTL_ULONG(_net_inet_ip
, OID_AUTO
, dispatch_slow_count
, CTLFLAG_RD
,
194 &ip_dispatch_slow
, 0, "Number of packets messaged to another CPU");
198 static int ipprintfs
= 0;
201 extern struct domain inetdomain
;
202 extern struct protosw inetsw
[];
203 u_char ip_protox
[IPPROTO_MAX
];
204 struct in_ifaddrhead in_ifaddrheads
[MAXCPU
]; /* first inet address */
205 struct in_ifaddrhashhead
*in_ifaddrhashtbls
[MAXCPU
];
206 /* inet addr hash table */
207 __read_mostly u_long in_ifaddrhmask
; /* mask for hash table */
209 static struct mbuf
*ipforward_mtemp
[MAXCPU
];
211 struct ip_stats ipstats_percpu
[MAXCPU
] __cachealign
;
214 sysctl_ipstats(SYSCTL_HANDLER_ARGS
)
218 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
219 if ((error
= SYSCTL_OUT(req
, &ipstats_percpu
[cpu
],
220 sizeof(struct ip_stats
))))
222 if ((error
= SYSCTL_IN(req
, &ipstats_percpu
[cpu
],
223 sizeof(struct ip_stats
))))
229 SYSCTL_PROC(_net_inet_ip
, IPCTL_STATS
, stats
, (CTLTYPE_OPAQUE
| CTLFLAG_RW
),
230 0, 0, sysctl_ipstats
, "S,ip_stats", "IP statistics");
232 /* Packet reassembly stuff */
233 #define IPREASS_NHASH_LOG2 6
234 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
235 #define IPREASS_HMASK (IPREASS_NHASH - 1)
236 #define IPREASS_HASH(x,y) \
237 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
239 TAILQ_HEAD(ipqhead
, ipq
);
240 struct ipfrag_queue
{
242 volatile int draining
;
243 struct netmsg_base timeo_netmsg
;
244 struct callout timeo_ch
;
245 struct netmsg_base drain_netmsg
;
246 struct ipqhead ipq
[IPREASS_NHASH
];
249 static struct ipfrag_queue ipfrag_queue_pcpu
[MAXCPU
];
252 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFMTU
, mtu
, CTLFLAG_RW
,
253 &ip_mtu
, 0, "Default MTU");
257 static int ipstealth
= 0;
258 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, stealth
, CTLFLAG_RW
, &ipstealth
, 0, "");
260 static const int ipstealth
= 0;
263 struct mbuf
*(*ip_divert_p
)(struct mbuf
*, int, int);
265 struct pfil_head inet_pfil_hook
;
268 * struct ip_srcrt_opt is used to store packet state while it travels
271 * XXX Note that the code even makes assumptions on the size and
272 * alignment of fields inside struct ip_srcrt so e.g. adding some
273 * fields will break the code. This needs to be fixed.
275 * We need to save the IP options in case a protocol wants to respond
276 * to an incoming packet over the same route if the packet got here
277 * using IP source routing. This allows connection establishment and
278 * maintenance when the remote end is on a network that is not known
282 struct in_addr dst
; /* final destination */
283 char nop
; /* one NOP to align */
284 char srcopt
[IPOPT_OFFSET
+ 1]; /* OPTVAL, OLEN and OFFSET */
285 struct in_addr route
[MAX_IPOPTLEN
/sizeof(struct in_addr
)];
288 struct ip_srcrt_opt
{
290 struct ip_srcrt ip_srcrt
;
293 #define IPFRAG_MPIPE_MAX 4096
294 #define MAXIPFRAG_MIN ((IPFRAG_MPIPE_MAX * 2) / 256)
296 #define IPFRAG_TIMEO (hz / PR_SLOWHZ)
298 static MALLOC_DEFINE(M_IPQ
, "ipq", "IP Fragment Management");
299 static struct malloc_pipe ipq_mpipe
;
301 static void save_rte(struct mbuf
*, u_char
*, struct in_addr
);
302 static int ip_dooptions(struct mbuf
*m
, int, struct sockaddr_in
*);
303 static void ip_freef(struct ipfrag_queue
*, struct ipqhead
*,
305 static void ip_input_handler(netmsg_t
);
306 static void ip_forward_redispatch(struct lwkt_port
*port
,
307 struct mbuf
*m
, boolean_t srcrt
);
309 static void ipfrag_timeo_dispatch(netmsg_t
);
310 static void ipfrag_timeo(void *);
311 static void ipfrag_drain_dispatch(netmsg_t
);
314 * IP initialization: fill in IP protocol switch table.
315 * All protocols not implemented in kernel go to raw IP protocol handler.
320 struct ipfrag_queue
*fragq
;
325 * Make sure we can handle a reasonable number of fragments but
326 * cap it at IPFRAG_MPIPE_MAX.
328 mpipe_init(&ipq_mpipe
, M_IPQ
, sizeof(struct ipq
),
329 IFQ_MAXLEN
, IPFRAG_MPIPE_MAX
, 0, NULL
, NULL
, NULL
);
332 * Make in_ifaddrhead and in_ifaddrhashtbl available on all CPUs,
333 * since they could be accessed by any threads.
335 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
336 TAILQ_INIT(&in_ifaddrheads
[cpu
]);
337 in_ifaddrhashtbls
[cpu
] =
338 hashinit(INADDR_NHASH
, M_IFADDR
, &in_ifaddrhmask
);
341 pr
= pffindproto(PF_INET
, IPPROTO_RAW
, SOCK_RAW
);
344 for (i
= 0; i
< IPPROTO_MAX
; i
++)
345 ip_protox
[i
] = pr
- inetsw
;
346 for (pr
= inetdomain
.dom_protosw
;
347 pr
< inetdomain
.dom_protoswNPROTOSW
; pr
++) {
348 if (pr
->pr_domain
->dom_family
== PF_INET
&& pr
->pr_protocol
) {
349 if (pr
->pr_protocol
!= IPPROTO_RAW
)
350 ip_protox
[pr
->pr_protocol
] = pr
- inetsw
;
354 inet_pfil_hook
.ph_type
= PFIL_TYPE_AF
;
355 inet_pfil_hook
.ph_af
= AF_INET
;
356 if ((i
= pfil_head_register(&inet_pfil_hook
)) != 0) {
357 kprintf("%s: WARNING: unable to register pfil hook, "
358 "error %d\n", __func__
, i
);
361 maxnipq
= (nmbclusters
/ 32) / netisr_ncpus
;
362 if (maxnipq
< MAXIPFRAG_MIN
)
363 maxnipq
= MAXIPFRAG_MIN
;
364 maxfragsperpacket
= 16;
366 ip_id
= time_second
& 0xffff; /* time_second survives reboots */
368 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
370 * Initialize IP statistics counters for each CPU.
372 bzero(&ipstats_percpu
[cpu
], sizeof(struct ip_stats
));
375 * Preallocate mbuf template for forwarding
377 MGETHDR(ipforward_mtemp
[cpu
], M_WAITOK
, MT_DATA
);
380 * Initialize per-cpu ip fragments queues
382 fragq
= &ipfrag_queue_pcpu
[cpu
];
383 for (i
= 0; i
< IPREASS_NHASH
; i
++)
384 TAILQ_INIT(&fragq
->ipq
[i
]);
386 callout_init_mp(&fragq
->timeo_ch
);
387 netmsg_init(&fragq
->timeo_netmsg
, NULL
, &netisr_adone_rport
,
388 MSGF_PRIORITY
, ipfrag_timeo_dispatch
);
389 netmsg_init(&fragq
->drain_netmsg
, NULL
, &netisr_adone_rport
,
390 MSGF_PRIORITY
, ipfrag_drain_dispatch
);
393 netisr_register(NETISR_IP
, ip_input_handler
, ip_hashfn
);
394 netisr_register_hashcheck(NETISR_IP
, ip_hashcheck
);
396 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
397 fragq
= &ipfrag_queue_pcpu
[cpu
];
398 callout_reset_bycpu(&fragq
->timeo_ch
, IPFRAG_TIMEO
,
399 ipfrag_timeo
, NULL
, cpu
);
402 ip_porthash_trycount
= 2 * netisr_ncpus
;
405 /* Do transport protocol processing. */
407 transport_processing_oncpu(struct mbuf
*m
, int hlen
, struct ip
*ip
)
409 const struct protosw
*pr
= &inetsw
[ip_protox
[ip
->ip_p
]];
412 * Switch out to protocol's input routine.
415 pr
->pr_input(&m
, &hlen
, ip
->ip_p
);
420 transport_processing_handler(netmsg_t msg
)
422 struct netmsg_packet
*pmsg
= &msg
->packet
;
426 ip
= mtod(pmsg
->nm_packet
, struct ip
*);
427 hlen
= pmsg
->base
.lmsg
.u
.ms_result
;
429 transport_processing_oncpu(pmsg
->nm_packet
, hlen
, ip
);
430 /* msg was embedded in the mbuf, do not reply! */
434 ip_input_handler(netmsg_t msg
)
436 ip_input(msg
->packet
.nm_packet
);
437 /* msg was embedded in the mbuf, do not reply! */
441 * IP input routine. Checksum and byte swap header. If fragmented
442 * try to reassemble. Process options. Pass to next level.
445 ip_input(struct mbuf
*m
)
448 struct in_ifaddr
*ia
= NULL
;
449 struct in_ifaddr_container
*iac
;
453 struct in_addr pkt_dst
;
454 boolean_t using_srcrt
= FALSE
; /* forward (by PFIL_HOOKS) */
455 struct in_addr odst
; /* original dst address(NAT) */
457 struct sockaddr_in
*next_hop
= NULL
;
460 ASSERT_NETISR_NCPUS(mycpuid
);
463 if (m
->m_len
< sizeof(struct ip
)) {
464 kprintf("Issuer to ip_input failed to check IP header atomicy (%d)\n",
470 /* length checks already done in ip_hashfn() */
471 KASSERT(m
->m_len
>= sizeof(struct ip
), ("IP header not in one mbuf"));
475 * This routine is called from numerous places which may not have
476 * characterized the packet.
478 ip
= mtod(m
, struct ip
*);
479 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
)) ||
480 (ip
->ip_off
& htons(IP_MF
| IP_OFFMASK
)))
483 * Force hash recalculation for fragments and multicast
484 * packets; hardware may not do it correctly.
485 * XXX add flag to indicate the hash is from hardware
487 m
->m_flags
&= ~M_HASH
;
489 if ((m
->m_flags
& M_HASH
) == 0) {
493 KKASSERT(m
->m_flags
& M_HASH
);
495 if (&curthread
->td_msgport
!=
496 netisr_hashport(m
->m_pkthdr
.hash
)) {
497 netisr_queue(NETISR_IP
, m
);
498 /* Requeued to other netisr msgport; done */
502 /* mbuf could have been changed */
503 ip
= mtod(m
, struct ip
*);
507 * Pull out certain tags
509 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
511 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
512 KKASSERT(mtag
!= NULL
);
513 next_hop
= m_tag_data(mtag
);
516 if (m
->m_pkthdr
.fw_flags
&
517 (DUMMYNET_MBUF_TAGGED
| IPFW_MBUF_CONTINUE
)) {
519 * - Dummynet already filtered this packet.
520 * - This packet was processed by ipfw on another
521 * cpu, and the rest of the ipfw processing should
522 * be carried out on this cpu.
524 ip
= mtod(m
, struct ip
*);
525 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
531 if (IP_VHL_V(ip
->ip_vhl
) != IPVERSION
) {
532 ipstat
.ips_badvers
++;
536 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
537 /* length checks already done in ip_hashfn() */
538 KASSERT(hlen
>= sizeof(struct ip
), ("IP header len too small"));
539 KASSERT(m
->m_len
>= hlen
, ("complete IP header not in one mbuf"));
541 /* 127/8 must not appear on wire - RFC1122 */
542 if ((ntohl(ip
->ip_dst
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
||
543 (ntohl(ip
->ip_src
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
) {
544 if (!(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
)) {
545 ipstat
.ips_badaddr
++;
550 if (m
->m_pkthdr
.csum_flags
& CSUM_IP_CHECKED
) {
551 sum
= !(m
->m_pkthdr
.csum_flags
& CSUM_IP_VALID
);
553 if (hlen
== sizeof(struct ip
))
554 sum
= in_cksum_hdr(ip
);
556 sum
= in_cksum(m
, hlen
);
564 if (altq_input
!= NULL
&& (*altq_input
)(m
, AF_INET
) == 0) {
565 /* packet is dropped by traffic conditioner */
570 * Convert fields to host representation.
572 ip_len
= ntohs(ip
->ip_len
);
574 /* length checks already done in ip_hashfn() */
575 KASSERT(ip_len
>= hlen
, ("total length incl header"));
576 KASSERT(m
->m_pkthdr
.len
>= ip_len
, ("mbuf too short"));
579 * Trim mbufs if longer than the IP header would have us expect.
581 if (m
->m_pkthdr
.len
> ip_len
) {
582 if (m
->m_len
== m
->m_pkthdr
.len
) {
584 m
->m_pkthdr
.len
= ip_len
;
586 m_adj(m
, ip_len
- m
->m_pkthdr
.len
);
592 * Right now when no processing on packet has done
593 * and it is still fresh out of network we do our black
595 * - Firewall: deny/allow/divert
596 * - Xlate: translate packet's addr/port (NAT).
597 * - Pipe: pass pkt through dummynet.
598 * - Wrap: fake packet's addr/port <unimpl.>
599 * - Encapsulate: put it in another IP and send out. <unimp.>
604 * If we've been forwarded from the output side, then
605 * skip the firewall a second time
607 if (next_hop
!= NULL
)
611 if (!pfil_has_hooks(&inet_pfil_hook
)) {
612 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
614 * Strip dummynet tags from stranded packets
616 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
617 KKASSERT(mtag
!= NULL
);
618 m_tag_delete(m
, mtag
);
619 m
->m_pkthdr
.fw_flags
&= ~DUMMYNET_MBUF_TAGGED
;
625 * Run through list of hooks for input packets.
627 * NOTE! If the packet is rewritten pf/ipfw/whoever must
631 if (pfil_run_hooks(&inet_pfil_hook
, &m
, m
->m_pkthdr
.rcvif
, PFIL_IN
))
633 if (m
== NULL
) /* consumed by filter */
635 ip
= mtod(m
, struct ip
*);
636 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
637 using_srcrt
= (odst
.s_addr
!= ip
->ip_dst
.s_addr
);
639 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
640 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
641 KKASSERT(mtag
!= NULL
);
642 next_hop
= m_tag_data(mtag
);
644 if (m
->m_pkthdr
.fw_flags
& DUMMYNET_MBUF_TAGGED
) {
648 if (m
->m_pkthdr
.fw_flags
& FW_MBUF_REDISPATCH
)
649 m
->m_pkthdr
.fw_flags
&= ~FW_MBUF_REDISPATCH
;
650 if (m
->m_pkthdr
.fw_flags
& IPFW_MBUF_CONTINUE
) {
651 /* ipfw was disabled/unloaded. */
656 * Process options and, if not destined for us,
657 * ship it on. ip_dooptions returns 1 when an
658 * error was detected (causing an icmp message
659 * to be sent and the original packet to be freed).
661 if (hlen
> sizeof(struct ip
) && ip_dooptions(m
, 0, next_hop
))
664 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
665 * matter if it is destined to another node, or whether it is
666 * a multicast one, RSVP wants it! and prevents it from being forwarded
667 * anywhere else. Also checks if the rsvp daemon is running before
668 * grabbing the packet.
670 if (rsvp_on
&& ip
->ip_p
== IPPROTO_RSVP
)
674 * Check our list of addresses, to see if the packet is for us.
675 * If we don't have any addresses, assume any unicast packet
676 * we receive might be for us (and let the upper layers deal
679 if (TAILQ_EMPTY(&in_ifaddrheads
[mycpuid
]) &&
680 !(m
->m_flags
& (M_MCAST
| M_BCAST
)))
686 * Cache the destination address of the packet; this may be
687 * changed by use of 'ipfw fwd'.
689 pkt_dst
= next_hop
? next_hop
->sin_addr
: ip
->ip_dst
;
692 * Enable a consistency check between the destination address
693 * and the arrival interface for a unicast packet (the RFC 1122
694 * strong ES model) if IP forwarding is disabled and the packet
695 * is not locally generated and the packet is not subject to
698 * XXX - Checking also should be disabled if the destination
699 * address is ipnat'ed to a different interface.
701 * XXX - Checking is incompatible with IP aliases added
702 * to the loopback interface instead of the interface where
703 * the packets are received.
705 checkif
= ip_checkinterface
&&
707 m
->m_pkthdr
.rcvif
!= NULL
&&
708 !(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
) &&
712 * Check for exact addresses in the hash bucket.
714 LIST_FOREACH(iac
, INADDR_HASH(pkt_dst
.s_addr
), ia_hash
) {
718 * If the address matches, verify that the packet
719 * arrived via the correct interface if checking is
722 if (IA_SIN(ia
)->sin_addr
.s_addr
== pkt_dst
.s_addr
&&
723 (!checkif
|| ia
->ia_ifp
== m
->m_pkthdr
.rcvif
))
731 * Check for broadcast addresses.
733 * Only accept broadcast packets that arrive via the matching
734 * interface. Reception of forwarded directed broadcasts would
735 * be handled via ip_forward() and ether_output() with the loopback
736 * into the stack for SIMPLEX interfaces handled by ether_output().
738 if (m
->m_pkthdr
.rcvif
!= NULL
&&
739 m
->m_pkthdr
.rcvif
->if_flags
& IFF_BROADCAST
) {
740 struct ifaddr_container
*ifac
;
742 TAILQ_FOREACH(ifac
, &m
->m_pkthdr
.rcvif
->if_addrheads
[mycpuid
],
744 struct ifaddr
*ifa
= ifac
->ifa
;
746 if (ifa
->ifa_addr
== NULL
) /* shutdown/startup race */
748 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
751 if (satosin(&ia
->ia_broadaddr
)->sin_addr
.s_addr
==
754 if (ia
->ia_netbroadcast
.s_addr
== pkt_dst
.s_addr
)
757 if (IA_SIN(ia
)->sin_addr
.s_addr
== INADDR_ANY
)
762 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
))) {
763 struct in_multi
*inm
;
765 if (ip_mrouter
!= NULL
) {
766 /* XXX Multicast routing is not MPSAFE yet */
770 * If we are acting as a multicast router, all
771 * incoming multicast packets are passed to the
772 * kernel-level multicast forwarding function.
773 * The packet is returned (relatively) intact; if
774 * ip_mforward() returns a non-zero value, the packet
775 * must be discarded, else it may be accepted below.
777 if (ip_mforward
!= NULL
&&
778 ip_mforward(ip
, m
->m_pkthdr
.rcvif
, m
, NULL
) != 0) {
780 ipstat
.ips_cantforward
++;
788 * The process-level routing daemon needs to receive
789 * all multicast IGMP packets, whether or not this
790 * host belongs to their destination groups.
792 if (ip
->ip_p
== IPPROTO_IGMP
)
794 ipstat
.ips_forward
++;
797 * See if we belong to the destination multicast group on the
800 inm
= IN_LOOKUP_MULTI(&ip
->ip_dst
, m
->m_pkthdr
.rcvif
);
802 ipstat
.ips_notmember
++;
808 if (ip
->ip_dst
.s_addr
== INADDR_BROADCAST
)
810 if (ip
->ip_dst
.s_addr
== INADDR_ANY
)
814 * Not for us; forward if possible and desirable.
817 ipstat
.ips_cantforward
++;
820 ip_forward(m
, using_srcrt
, next_hop
);
827 * IPSTEALTH: Process non-routing options only
828 * if the packet is destined for us.
831 hlen
> sizeof(struct ip
) &&
832 ip_dooptions(m
, 1, next_hop
))
837 /* Count the packet in the ip address stats */
839 IFA_STAT_INC(&ia
->ia_ifa
, ipackets
, 1);
840 IFA_STAT_INC(&ia
->ia_ifa
, ibytes
, m
->m_pkthdr
.len
);
844 * If offset or IP_MF are set, must reassemble.
845 * Otherwise, nothing need be done.
846 * (We could look in the reassembly queue to see
847 * if the packet was previously fragmented,
848 * but it's not worth the time; just let them time out.)
850 if (ip
->ip_off
& htons(IP_MF
| IP_OFFMASK
)) {
852 * Attempt reassembly; if it succeeds, proceed. ip_reass()
853 * will return a different mbuf.
855 * NOTE: ip_reass() returns m with M_HASH cleared to force
856 * us to recharacterize the packet.
861 ip
= mtod(m
, struct ip
*);
863 /* Get the header length of the reassembled packet */
864 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
868 * We must forward the packet to the correct protocol thread if
869 * we are not already in it.
871 * NOTE: ip_len is left in network form. ip_len is not adjusted
872 * further for protocol processing, instead we pass hlen
873 * to the protosw and let it deal with it.
875 ipstat
.ips_delivered
++;
877 if ((m
->m_flags
& M_HASH
) == 0) {
881 ip
= mtod(m
, struct ip
*);
883 port
= netisr_hashport(m
->m_pkthdr
.hash
);
885 if (port
!= &curthread
->td_msgport
) {
886 ip_transport_redispatch(port
, m
, hlen
);
889 atomic_add_long(&ip_dispatch_fast
, 1);
891 transport_processing_oncpu(m
, hlen
, ip
);
900 ip_rehashm(struct mbuf
*m
)
902 struct ip
*ip
= mtod(m
, struct ip
*);
905 atomic_add_long(&ip_rehash_count
, 1);
911 /* 'm' might be changed by ip_hashfn(). */
912 ip
= mtod(m
, struct ip
*);
913 KASSERT(m
->m_flags
& M_HASH
, ("no hash"));
919 ip_transport_redispatch(struct lwkt_port
*port
, struct mbuf
*m
, int hlen
)
921 struct netmsg_packet
*pmsg
;
924 atomic_add_long(&ip_dispatch_slow
, 1);
927 pmsg
= &m
->m_hdr
.mh_netmsg
;
928 netmsg_init(&pmsg
->base
, NULL
, &netisr_apanic_rport
,
929 0, transport_processing_handler
);
931 pmsg
->base
.lmsg
.u
.ms_result
= hlen
;
932 lwkt_sendmsg(port
, &pmsg
->base
.lmsg
);
936 ip_forward_handler(netmsg_t msg
)
938 struct netmsg_forward
*fmsg
;
941 struct sockaddr_in
*next_hop
= NULL
;
943 fmsg
= &msg
->forward
;
946 /* Re-extract the next hop if it exists */
947 if (m
->m_pkthdr
.fw_flags
& IPFORWARD_MBUF_TAGGED
) {
949 mtag
= m_tag_find(m
, PACKET_TAG_IPFORWARD
, NULL
);
950 KKASSERT(mtag
!= NULL
);
951 next_hop
= m_tag_data(mtag
);
954 ip_forward(m
, fmsg
->using_srcrt
, next_hop
);
955 /* msg was embedded in the mbuf, do not reply! */
959 ip_forward_redispatch(struct lwkt_port
*port
, struct mbuf
*m
, boolean_t srcrt
)
961 struct netmsg_forward
*fmsg
;
963 fmsg
= &m
->m_hdr
.mh_fwdmsg
;
964 netmsg_init(&fmsg
->base
, NULL
, &netisr_apanic_rport
,
965 0, ip_forward_handler
);
967 fmsg
->using_srcrt
= srcrt
;
968 lwkt_sendmsg(port
, &fmsg
->base
.lmsg
);
972 * Take incoming datagram fragment and try to reassemble it into
973 * whole datagram. If a chain for reassembly of this datagram already
974 * exists, then it is given as fp; otherwise have to make a chain.
977 ip_reass(struct mbuf
*m
)
979 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
980 struct ip
*ip
= mtod(m
, struct ip
*);
981 struct mbuf
*p
= NULL
, *q
, *nq
;
983 struct ipq
*fp
= NULL
;
984 struct ipqhead
*head
;
985 int hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
991 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
992 if (maxnipq
== 0 || maxfragsperpacket
== 0) {
993 ipstat
.ips_fragments
++;
994 ipstat
.ips_fragdropped
++;
999 sum
= IPREASS_HASH(ip
->ip_src
.s_addr
, ip
->ip_id
);
1001 * Look for queue of fragments of this datagram.
1003 head
= &fragq
->ipq
[sum
];
1004 TAILQ_FOREACH(fp
, head
, ipq_list
) {
1005 if (ip
->ip_id
== fp
->ipq_id
&&
1006 ip
->ip_src
.s_addr
== fp
->ipq_src
.s_addr
&&
1007 ip
->ip_dst
.s_addr
== fp
->ipq_dst
.s_addr
&&
1008 ip
->ip_p
== fp
->ipq_p
)
1017 * Enforce upper bound on number of fragmented packets
1018 * for which we attempt reassembly;
1019 * If maxnipq is -1, accept all fragments without limitation.
1021 if (fragq
->nipq
> maxnipq
&& maxnipq
> 0) {
1023 * drop something from the tail of the current queue
1024 * before proceeding further
1026 struct ipq
*q
= TAILQ_LAST(head
, ipqhead
);
1029 * The current queue is empty,
1030 * so drop from one of the others.
1032 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1035 r
= TAILQ_LAST(&fragq
->ipq
[i
], ipqhead
);
1037 ipstat
.ips_fragtimeout
+= r
->ipq_nfrags
;
1038 ip_freef(fragq
, &fragq
->ipq
[i
], r
);
1043 ipstat
.ips_fragtimeout
+= q
->ipq_nfrags
;
1044 ip_freef(fragq
, head
, q
);
1049 * NOTE: ip_len is no longer adjusted to remove the header length.
1051 if (ip
->ip_off
& htons(IP_MF
)) {
1053 * Make sure that fragments have a data length
1054 * that's a non-zero multiple of 8 bytes. The
1055 * IP header itself might be in multiples of 4
1056 * bytes and is discounted.
1058 ip_len
= ntohs(ip
->ip_len
) - hlen
;
1059 if (ip_len
== 0 || (ip_len
& 7) != 0) {
1060 ipstat
.ips_toosmall
++; /* XXX */
1064 m
->m_flags
|= M_FRAG
;
1066 m
->m_flags
&= ~M_FRAG
;
1069 ipstat
.ips_fragments
++;
1070 m
->m_pkthdr
.header
= ip
;
1073 * If the hardware has not done csum over this fragment
1074 * then csum_data is not valid at all.
1076 if ((m
->m_pkthdr
.csum_flags
& (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
))
1077 == (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
))
1079 m
->m_pkthdr
.csum_data
= 0;
1080 m
->m_pkthdr
.csum_flags
&= ~(CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
1084 * Presence of header sizes in mbufs would confuse code below.
1085 * Note that ip->ip_len is not modified and retains the header length,
1086 * but local ip_len and fp_len variables remove the header length.
1092 * If first fragment to arrive, create a reassembly queue.
1095 if ((fp
= mpipe_alloc_nowait(&ipq_mpipe
)) == NULL
)
1097 TAILQ_INSERT_HEAD(head
, fp
, ipq_list
);
1100 fp
->ipq_ttl
= IPFRAGTTL
;
1101 fp
->ipq_p
= ip
->ip_p
;
1102 fp
->ipq_id
= ip
->ip_id
;
1103 fp
->ipq_src
= ip
->ip_src
;
1104 fp
->ipq_dst
= ip
->ip_dst
;
1106 m
->m_nextpkt
= NULL
;
1111 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
1114 * Find a segment which begins after this one does. We
1115 * don't have to fully convert the offset field for this
1118 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1119 if ((ntohs(GETIP(q
)->ip_off
) & IP_OFFMASK
) >
1120 (ntohs(ip
->ip_off
) & IP_OFFMASK
))
1127 * Drop fragment if it overflows the maximum allowed IP
1130 ip_off
= (ntohs(ip
->ip_off
) & IP_OFFMASK
) << 3;
1131 ip_len
= ntohs(ip
->ip_len
);
1133 if (ip_off
+ ip_len
> 65535U)
1139 * If there is a preceding segment, it may provide some of
1140 * our data already. If so, drop the data from the incoming
1141 * segment. If it provides all of our data, drop us, otherwise
1142 * stick new segment in the proper place.
1144 * If some of the data is dropped from the the preceding
1145 * segment, then it's checksum is invalidated.
1153 * Calculations in bytes and ip_len/fp_len do not reflect
1156 fp_off
= (ntohs(GETIP(p
)->ip_off
) & IP_OFFMASK
) << 3;
1157 fp_len
= ntohs(GETIP(p
)->ip_len
) -
1158 (IP_VHL_HL(GETIP(p
)->ip_vhl
) << 2);
1160 if (fp_off
+ fp_len
> ip_off
) {
1161 i
= fp_off
+ fp_len
- ip_off
;
1165 m
->m_pkthdr
.csum_flags
= 0;
1166 ip_off
= fp_off
+ fp_len
;
1170 * Non-optimal modification of packet content, but
1171 * in this rare case we don't care.
1173 ip
->ip_off
= htons(ip_off
>> 3);
1174 ip
->ip_len
= htons(ip_len
+ hlen
);
1176 m
->m_nextpkt
= p
->m_nextpkt
;
1179 m
->m_nextpkt
= fp
->ipq_frags
;
1184 * Dequeue any later segments that we completely overlap.
1185 * While we overlap succeeding segments trim them or,
1186 * if they are completely covered, dequeue them.
1193 fp_off
= (ntohs(GETIP(q
)->ip_off
) & IP_OFFMASK
) << 3;
1194 fp_hlen
= (IP_VHL_HL(GETIP(q
)->ip_vhl
) << 2);
1195 fp_len
= ntohs(GETIP(q
)->ip_len
) - fp_hlen
;
1196 if (ip_off
+ ip_len
<= fp_off
)
1198 i
= ip_off
+ ip_len
- fp_off
; /* bytes overlapped */
1202 * Non-optimal modification of packet content, but
1203 * in this rare case we don't care.
1205 GETIP(q
)->ip_len
= htons(fp_len
- i
+ fp_hlen
);
1206 GETIP(q
)->ip_off
= htons((fp_off
+ i
) >> 3);
1208 q
->m_pkthdr
.csum_flags
= 0;
1213 ipstat
.ips_fragdropped
++;
1215 q
->m_nextpkt
= NULL
;
1223 * Check for complete reassembly and perform frag per packet
1226 * Frag limiting is performed here so that the nth frag has
1227 * a chance to complete the packet before we drop the packet.
1228 * As a result, n+1 frags are actually allowed per packet, but
1229 * only n will ever be stored. (n = maxfragsperpacket.)
1233 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1238 fp_off
= (ntohs(GETIP(q
)->ip_off
) & IP_OFFMASK
) << 3;
1239 fp_hlen
= (IP_VHL_HL(GETIP(q
)->ip_vhl
) << 2);
1240 fp_len
= ntohs(GETIP(q
)->ip_len
) - fp_hlen
;
1241 if (fp_off
!= next
) {
1242 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1243 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1244 ip_freef(fragq
, head
, fp
);
1250 /* Make sure the last packet didn't have the IP_MF flag */
1251 if (p
->m_flags
& M_FRAG
) {
1252 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1253 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1254 ip_freef(fragq
, head
, fp
);
1260 * Reassembly is complete. Make sure the packet is a sane size.
1264 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
1265 if (next
+ (IP_VHL_HL(ip
->ip_vhl
) << 2) > IP_MAXPACKET
) {
1266 ipstat
.ips_toolong
++;
1267 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1268 ip_freef(fragq
, head
, fp
);
1273 * Concatenate fragments.
1280 q
->m_nextpkt
= NULL
;
1281 for (q
= nq
; q
!= NULL
; q
= nq
) {
1283 q
->m_nextpkt
= NULL
;
1284 m
->m_pkthdr
.csum_flags
&= q
->m_pkthdr
.csum_flags
;
1285 m
->m_pkthdr
.csum_data
+= q
->m_pkthdr
.csum_data
;
1290 * Clean up the 1's complement checksum. Carry over 16 bits must
1291 * be added back. This assumes no more then 65535 packet fragments
1292 * were reassembled. A second carry can also occur (but not a third).
1294 m
->m_pkthdr
.csum_data
= (m
->m_pkthdr
.csum_data
& 0xffff) +
1295 (m
->m_pkthdr
.csum_data
>> 16);
1296 if (m
->m_pkthdr
.csum_data
> 0xFFFF)
1297 m
->m_pkthdr
.csum_data
-= 0xFFFF;
1300 * Create header for new ip packet by modifying the header of the
1301 * first packet. Dequeue and discard the fragment reassembly header.
1302 * Make the header visible. Set the offset to 0 and keep only the
1303 * DF flag from the first packet's ip_off field.
1305 * Note that ip_len includes the header length.
1307 ip
->ip_len
= htons(next
+ hlen
);
1308 ip
->ip_src
= fp
->ipq_src
;
1309 ip
->ip_dst
= fp
->ipq_dst
;
1310 ip
->ip_off
&= htons(IP_DF
);
1311 TAILQ_REMOVE(head
, fp
, ipq_list
);
1313 mpipe_free(&ipq_mpipe
, fp
);
1315 m
->m_len
+= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1316 m
->m_data
-= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1317 /* some debugging cruft by sklower, below, will go away soon */
1318 if (m
->m_flags
& M_PKTHDR
) { /* XXX this should be done elsewhere */
1321 for (n
= m
; n
; n
= n
->m_next
)
1323 m
->m_pkthdr
.len
= plen
;
1327 * Reassembly complete, return the next protocol.
1329 * Be sure to clear M_HASH to force the packet
1330 * to be re-characterized.
1332 * Clear M_FRAG, we are no longer a fragment.
1334 m
->m_flags
&= ~(M_HASH
| M_FRAG
);
1336 ipstat
.ips_reassembled
++;
1340 ipstat
.ips_fragdropped
++;
1351 * Free a fragment reassembly header and all
1352 * associated datagrams.
1355 ip_freef(struct ipfrag_queue
*fragq
, struct ipqhead
*fhp
, struct ipq
*fp
)
1360 * Remove first to protect against blocking
1362 TAILQ_REMOVE(fhp
, fp
, ipq_list
);
1365 * Clean out at our leisure
1367 while (fp
->ipq_frags
) {
1369 fp
->ipq_frags
= q
->m_nextpkt
;
1370 q
->m_nextpkt
= NULL
;
1373 mpipe_free(&ipq_mpipe
, fp
);
1378 * If a timer expires on a reassembly queue, discard it.
1381 ipfrag_timeo_dispatch(netmsg_t nmsg
)
1383 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1384 struct ipq
*fp
, *fp_temp
;
1385 struct ipqhead
*head
;
1389 netisr_replymsg(&nmsg
->base
, 0); /* reply ASAP */
1392 if (fragq
->nipq
== 0)
1395 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1396 head
= &fragq
->ipq
[i
];
1397 TAILQ_FOREACH_MUTABLE(fp
, head
, ipq_list
, fp_temp
) {
1398 if (--fp
->ipq_ttl
== 0) {
1399 ipstat
.ips_fragtimeout
+= fp
->ipq_nfrags
;
1400 ip_freef(fragq
, head
, fp
);
1405 * If we are over the maximum number of fragments
1406 * (due to the limit being lowered), drain off
1407 * enough to get down to the new limit.
1409 if (maxnipq
>= 0 && fragq
->nipq
> maxnipq
) {
1410 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1411 head
= &fragq
->ipq
[i
];
1412 while (fragq
->nipq
> maxnipq
&& !TAILQ_EMPTY(head
)) {
1413 ipstat
.ips_fragdropped
+=
1414 TAILQ_FIRST(head
)->ipq_nfrags
;
1415 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1420 callout_reset(&fragq
->timeo_ch
, IPFRAG_TIMEO
, ipfrag_timeo
, NULL
);
1424 ipfrag_timeo(void *dummy __unused
)
1426 struct netmsg_base
*msg
= &ipfrag_queue_pcpu
[mycpuid
].timeo_netmsg
;
1429 if (msg
->lmsg
.ms_flags
& MSGF_DONE
)
1430 netisr_sendmsg_oncpu(msg
);
1435 * Drain off all datagram fragments.
1438 ipfrag_drain_oncpu(struct ipfrag_queue
*fragq
)
1440 struct ipqhead
*head
;
1443 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1444 head
= &fragq
->ipq
[i
];
1445 while (!TAILQ_EMPTY(head
)) {
1446 ipstat
.ips_fragdropped
+= TAILQ_FIRST(head
)->ipq_nfrags
;
1447 ip_freef(fragq
, head
, TAILQ_FIRST(head
));
1453 ipfrag_drain_dispatch(netmsg_t nmsg
)
1455 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[mycpuid
];
1458 lwkt_replymsg(&nmsg
->lmsg
, 0); /* reply ASAP */
1461 ipfrag_drain_oncpu(fragq
);
1462 fragq
->draining
= 0;
1466 ipfrag_drain_ipi(void *arg __unused
)
1469 struct lwkt_msg
*msg
= &ipfrag_queue_pcpu
[cpu
].drain_netmsg
.lmsg
;
1472 if (msg
->ms_flags
& MSGF_DONE
)
1473 lwkt_sendmsg_oncpu(netisr_cpuport(cpu
), msg
);
1483 CPUMASK_ASSBMASK(mask
, netisr_ncpus
);
1484 CPUMASK_ANDMASK(mask
, smp_active_mask
);
1486 if (IN_NETISR_NCPUS(mycpuid
)) {
1487 ipfrag_drain_oncpu(&ipfrag_queue_pcpu
[mycpuid
]);
1488 CPUMASK_NANDBIT(mask
, mycpuid
);
1491 for (cpu
= 0; cpu
< netisr_ncpus
; ++cpu
) {
1492 struct ipfrag_queue
*fragq
= &ipfrag_queue_pcpu
[cpu
];
1494 if (!CPUMASK_TESTBIT(mask
, cpu
))
1497 if (fragq
->nipq
== 0 || fragq
->draining
) {
1498 /* No fragments or is draining; skip this cpu. */
1499 CPUMASK_NANDBIT(mask
, cpu
);
1502 fragq
->draining
= 1;
1505 if (CPUMASK_TESTNZERO(mask
))
1506 lwkt_send_ipiq_mask(mask
, ipfrag_drain_ipi
, NULL
);
1517 * Do option processing on a datagram,
1518 * possibly discarding it if bad options are encountered,
1519 * or forwarding it if source-routed.
1520 * The pass argument is used when operating in the IPSTEALTH
1521 * mode to tell what options to process:
1522 * [LS]SRR (pass 0) or the others (pass 1).
1523 * The reason for as many as two passes is that when doing IPSTEALTH,
1524 * non-routing options should be processed only if the packet is for us.
1525 * Returns 1 if packet has been forwarded/freed,
1526 * 0 if the packet should be processed further.
1529 ip_dooptions(struct mbuf
*m
, int pass
, struct sockaddr_in
*next_hop
)
1531 struct sockaddr_in ipaddr
= { sizeof ipaddr
, AF_INET
};
1532 struct ip
*ip
= mtod(m
, struct ip
*);
1534 struct in_ifaddr
*ia
;
1535 int opt
, optlen
, cnt
, off
, code
, type
= ICMP_PARAMPROB
;
1536 boolean_t forward
= FALSE
;
1537 struct in_addr
*sin
, dst
;
1541 cp
= (u_char
*)(ip
+ 1);
1542 cnt
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1543 for (; cnt
> 0; cnt
-= optlen
, cp
+= optlen
) {
1544 opt
= cp
[IPOPT_OPTVAL
];
1545 if (opt
== IPOPT_EOL
)
1547 if (opt
== IPOPT_NOP
)
1550 if (cnt
< IPOPT_OLEN
+ sizeof(*cp
)) {
1551 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1554 optlen
= cp
[IPOPT_OLEN
];
1555 if (optlen
< IPOPT_OLEN
+ sizeof(*cp
) || optlen
> cnt
) {
1556 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1566 * Source routing with record.
1567 * Find interface with current destination address.
1568 * If none on this machine then drop if strictly routed,
1569 * or do nothing if loosely routed.
1570 * Record interface address and bring up next address
1571 * component. If strictly routed make sure next
1572 * address is on directly accessible net.
1576 if (ipstealth
&& pass
> 0)
1578 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1579 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1582 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1583 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1586 ipaddr
.sin_addr
= ip
->ip_dst
;
1587 ia
= (struct in_ifaddr
*)
1588 ifa_ifwithaddr((struct sockaddr
*)&ipaddr
);
1590 if (opt
== IPOPT_SSRR
) {
1591 type
= ICMP_UNREACH
;
1592 code
= ICMP_UNREACH_SRCFAIL
;
1595 if (!ip_dosourceroute
)
1596 goto nosourcerouting
;
1598 * Loose routing, and not at next destination
1599 * yet; nothing to do except forward.
1603 off
--; /* 0 origin */
1604 if (off
> optlen
- (int)sizeof(struct in_addr
)) {
1606 * End of source route. Should be for us.
1608 if (!ip_acceptsourceroute
)
1609 goto nosourcerouting
;
1610 save_rte(m
, cp
, ip
->ip_src
);
1615 if (!ip_dosourceroute
) {
1617 char sbuf
[INET_ADDRSTRLEN
];
1618 char dbuf
[INET_ADDRSTRLEN
];
1621 * Acting as a router, so generate ICMP
1625 "attempted source route from %s to %s\n",
1626 kinet_ntoa(ip
->ip_src
, sbuf
),
1627 kinet_ntoa(ip
->ip_dst
, dbuf
));
1628 type
= ICMP_UNREACH
;
1629 code
= ICMP_UNREACH_SRCFAIL
;
1633 * Not acting as a router,
1637 ipstat
.ips_cantforward
++;
1644 * locate outgoing interface
1646 memcpy(&ipaddr
.sin_addr
, cp
+ off
,
1647 sizeof ipaddr
.sin_addr
);
1649 if (opt
== IPOPT_SSRR
) {
1650 #define INA struct in_ifaddr *
1651 #define SA struct sockaddr *
1652 if ((ia
= (INA
)ifa_ifwithdstaddr((SA
)&ipaddr
))
1654 ia
= (INA
)ifa_ifwithnet((SA
)&ipaddr
);
1656 ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
);
1659 type
= ICMP_UNREACH
;
1660 code
= ICMP_UNREACH_SRCFAIL
;
1663 ip
->ip_dst
= ipaddr
.sin_addr
;
1664 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1665 sizeof(struct in_addr
));
1666 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1668 * Let ip_intr's mcast routing check handle mcast pkts
1670 forward
= !IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
));
1674 if (ipstealth
&& pass
== 0)
1676 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1677 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1680 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1681 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1685 * If no space remains, ignore.
1687 off
--; /* 0 origin */
1688 if (off
> optlen
- (int)sizeof(struct in_addr
))
1690 memcpy(&ipaddr
.sin_addr
, &ip
->ip_dst
,
1691 sizeof ipaddr
.sin_addr
);
1693 * locate outgoing interface; if we're the destination,
1694 * use the incoming interface (should be same).
1696 if ((ia
= (INA
)ifa_ifwithaddr((SA
)&ipaddr
)) == NULL
&&
1697 (ia
= ip_rtaddr(ipaddr
.sin_addr
, NULL
)) == NULL
) {
1698 type
= ICMP_UNREACH
;
1699 code
= ICMP_UNREACH_HOST
;
1702 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1703 sizeof(struct in_addr
));
1704 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1708 if (ipstealth
&& pass
== 0)
1710 code
= cp
- (u_char
*)ip
;
1711 if (optlen
< 4 || optlen
> 40) {
1712 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1715 if ((off
= cp
[IPOPT_OFFSET
]) < 5) {
1716 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1719 if (off
> optlen
- (int)sizeof(int32_t)) {
1720 cp
[IPOPT_OFFSET
+ 1] += (1 << 4);
1721 if ((cp
[IPOPT_OFFSET
+ 1] & 0xf0) == 0) {
1722 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1727 off
--; /* 0 origin */
1728 sin
= (struct in_addr
*)(cp
+ off
);
1729 switch (cp
[IPOPT_OFFSET
+ 1] & 0x0f) {
1731 case IPOPT_TS_TSONLY
:
1734 case IPOPT_TS_TSANDADDR
:
1735 if (off
+ sizeof(n_time
) +
1736 sizeof(struct in_addr
) > optlen
) {
1737 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1740 ipaddr
.sin_addr
= dst
;
1741 ia
= (INA
)ifaof_ifpforaddr((SA
)&ipaddr
,
1745 memcpy(sin
, &IA_SIN(ia
)->sin_addr
,
1746 sizeof(struct in_addr
));
1747 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1748 off
+= sizeof(struct in_addr
);
1751 case IPOPT_TS_PRESPEC
:
1752 if (off
+ sizeof(n_time
) +
1753 sizeof(struct in_addr
) > optlen
) {
1754 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1757 memcpy(&ipaddr
.sin_addr
, sin
,
1758 sizeof(struct in_addr
));
1759 if (ifa_ifwithaddr((SA
)&ipaddr
) == NULL
)
1761 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1762 off
+= sizeof(struct in_addr
);
1766 code
= &cp
[IPOPT_OFFSET
+ 1] - (u_char
*)ip
;
1770 memcpy(cp
+ off
, &ntime
, sizeof(n_time
));
1771 cp
[IPOPT_OFFSET
] += sizeof(n_time
);
1774 if (forward
&& ipforwarding
) {
1775 ip_forward(m
, TRUE
, next_hop
);
1780 icmp_error(m
, type
, code
, 0, 0);
1781 ipstat
.ips_badoptions
++;
1786 * Given address of next destination (final or next hop),
1787 * return internet address info of interface to be used to get there.
1790 ip_rtaddr(struct in_addr dst
, struct route
*ro0
)
1792 struct route sro
, *ro
;
1793 struct sockaddr_in
*sin
;
1794 struct in_ifaddr
*ia
;
1799 bzero(&sro
, sizeof(sro
));
1803 sin
= (struct sockaddr_in
*)&ro
->ro_dst
;
1805 if (ro
->ro_rt
== NULL
|| dst
.s_addr
!= sin
->sin_addr
.s_addr
) {
1806 if (ro
->ro_rt
!= NULL
) {
1810 sin
->sin_family
= AF_INET
;
1811 sin
->sin_len
= sizeof *sin
;
1812 sin
->sin_addr
= dst
;
1813 rtalloc_ign(ro
, RTF_PRCLONING
);
1816 if (ro
->ro_rt
== NULL
)
1819 ia
= ifatoia(ro
->ro_rt
->rt_ifa
);
1827 * Save incoming source route for use in replies,
1828 * to be picked up later by ip_srcroute if the receiver is interested.
1831 save_rte(struct mbuf
*m
, u_char
*option
, struct in_addr dst
)
1834 struct ip_srcrt_opt
*opt
;
1837 mtag
= m_tag_get(PACKET_TAG_IPSRCRT
, sizeof(*opt
), M_NOWAIT
);
1840 opt
= m_tag_data(mtag
);
1842 olen
= option
[IPOPT_OLEN
];
1845 kprintf("save_rte: olen %d\n", olen
);
1847 if (olen
> sizeof(opt
->ip_srcrt
) - (1 + sizeof(dst
))) {
1851 bcopy(option
, opt
->ip_srcrt
.srcopt
, olen
);
1852 opt
->ip_nhops
= (olen
- IPOPT_OFFSET
- 1) / sizeof(struct in_addr
);
1853 opt
->ip_srcrt
.dst
= dst
;
1854 m_tag_prepend(m
, mtag
);
1858 * Retrieve incoming source route for use in replies,
1859 * in the same form used by setsockopt.
1860 * The first hop is placed before the options, will be removed later.
1863 ip_srcroute(struct mbuf
*m0
)
1865 struct in_addr
*p
, *q
;
1868 struct ip_srcrt_opt
*opt
;
1873 mtag
= m_tag_find(m0
, PACKET_TAG_IPSRCRT
, NULL
);
1876 opt
= m_tag_data(mtag
);
1878 if (opt
->ip_nhops
== 0)
1880 m
= m_get(M_NOWAIT
, MT_HEADER
);
1884 #define OPTSIZ (sizeof(opt->ip_srcrt.nop) + sizeof(opt->ip_srcrt.srcopt))
1886 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1887 m
->m_len
= opt
->ip_nhops
* sizeof(struct in_addr
) +
1888 sizeof(struct in_addr
) + OPTSIZ
;
1891 kprintf("ip_srcroute: nhops %d mlen %d",
1892 opt
->ip_nhops
, m
->m_len
);
1897 * First save first hop for return route
1899 p
= &opt
->ip_srcrt
.route
[opt
->ip_nhops
- 1];
1900 *(mtod(m
, struct in_addr
*)) = *p
--;
1903 kprintf(" hops %x", ntohl(mtod(m
, struct in_addr
*)->s_addr
));
1907 * Copy option fields and padding (nop) to mbuf.
1909 opt
->ip_srcrt
.nop
= IPOPT_NOP
;
1910 opt
->ip_srcrt
.srcopt
[IPOPT_OFFSET
] = IPOPT_MINOFF
;
1911 memcpy(mtod(m
, caddr_t
) + sizeof(struct in_addr
), &opt
->ip_srcrt
.nop
,
1913 q
= (struct in_addr
*)(mtod(m
, caddr_t
) +
1914 sizeof(struct in_addr
) + OPTSIZ
);
1917 * Record return path as an IP source route,
1918 * reversing the path (pointers are now aligned).
1920 while (p
>= opt
->ip_srcrt
.route
) {
1923 kprintf(" %x", ntohl(q
->s_addr
));
1928 * Last hop goes to final destination.
1930 *q
= opt
->ip_srcrt
.dst
;
1931 m_tag_delete(m0
, mtag
);
1934 kprintf(" %x\n", ntohl(q
->s_addr
));
1940 * Strip out IP options.
1943 ip_stripoptions(struct mbuf
*m
)
1946 struct ip
*ip
= mtod(m
, struct ip
*);
1950 optlen
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1951 opts
= (caddr_t
)(ip
+ 1);
1952 datalen
= m
->m_len
- (sizeof(struct ip
) + optlen
);
1953 bcopy(opts
+ optlen
, opts
, datalen
);
1955 if (m
->m_flags
& M_PKTHDR
)
1956 m
->m_pkthdr
.len
-= optlen
;
1957 /* leave ip version intact */
1958 ip
->ip_len
= htons(ntohs(ip
->ip_len
) - optlen
);
1959 ip
->ip_vhl
= IP_MAKE_VHL(IP_VHL_V(ip
->ip_vhl
), sizeof(struct ip
) >> 2);
1962 u_char inetctlerrmap
[PRC_NCMDS
] = {
1964 0, EMSGSIZE
, EHOSTDOWN
, EHOSTUNREACH
,
1965 EHOSTUNREACH
, EHOSTUNREACH
, ECONNREFUSED
, ECONNREFUSED
,
1966 EMSGSIZE
, EHOSTUNREACH
, 0, 0,
1968 ENOPROTOOPT
, ECONNREFUSED
1972 * Forward a packet. If some error occurs return the sender
1973 * an icmp packet. Note we can't always generate a meaningful
1974 * icmp message because icmp doesn't have a large enough repertoire
1975 * of codes and types.
1977 * If not forwarding, just drop the packet. This could be confusing
1978 * if ipforwarding was zero but some routing protocol was advancing
1979 * us as a gateway to somewhere. However, we must let the routing
1980 * protocol deal with that.
1982 * The using_srcrt parameter indicates whether the packet is being forwarded
1983 * via a source route.
1986 ip_forward(struct mbuf
*m
, boolean_t using_srcrt
, struct sockaddr_in
*next_hop
)
1988 struct ip
*ip
= mtod(m
, struct ip
*);
1990 struct route fwd_ro
;
1991 int error
, type
= 0, code
= 0, destmtu
= 0;
1992 struct mbuf
*mcopy
, *mtemp
= NULL
;
1994 struct in_addr pkt_dst
;
1998 * Cache the destination address of the packet; this may be
1999 * changed by use of 'ipfw fwd'.
2001 pkt_dst
= (next_hop
!= NULL
) ? next_hop
->sin_addr
: ip
->ip_dst
;
2005 kprintf("forward: src %x dst %x ttl %x\n",
2006 ip
->ip_src
.s_addr
, pkt_dst
.s_addr
, ip
->ip_ttl
);
2009 if ((m
->m_flags
& M_HASH
) == 0) {
2016 port
= netisr_hashport(m
->m_pkthdr
.hash
);
2018 if (port
!= &curthread
->td_msgport
) {
2019 ip_forward_redispatch(port
, m
, using_srcrt
);
2020 /* Requeued to other msgport; done */
2024 if (m
->m_flags
& (M_BCAST
| M_MCAST
) || !in_canforward(pkt_dst
)) {
2025 ipstat
.ips_cantforward
++;
2029 if (!ipstealth
&& ip
->ip_ttl
<= IPTTLDEC
) {
2030 icmp_error(m
, ICMP_TIMXCEED
, ICMP_TIMXCEED_INTRANS
, dest
, 0);
2034 bzero(&fwd_ro
, sizeof(fwd_ro
));
2035 ip_rtaddr(pkt_dst
, &fwd_ro
);
2036 if (fwd_ro
.ro_rt
== NULL
) {
2037 icmp_error(m
, ICMP_UNREACH
, ICMP_UNREACH_HOST
, dest
, 0);
2042 if (curthread
->td_type
== TD_TYPE_NETISR
) {
2044 * Save the IP header and at most 8 bytes of the payload,
2045 * in case we need to generate an ICMP message to the src.
2047 mtemp
= ipforward_mtemp
[mycpuid
];
2048 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2049 mtemp
->m_data
== mtemp
->m_pktdat
&&
2050 m_tag_first(mtemp
) == NULL
,
2051 ("ip_forward invalid mtemp1"));
2053 if (!m_dup_pkthdr(mtemp
, m
, M_NOWAIT
)) {
2055 * It's probably ok if the pkthdr dup fails (because
2056 * the deep copy of the tag chain failed), but for now
2057 * be conservative and just discard the copy since
2058 * code below may some day want the tags.
2062 mtemp
->m_type
= m
->m_type
;
2063 mtemp
->m_len
= imin((IP_VHL_HL(ip
->ip_vhl
) << 2) + 8,
2064 (int)ntohs(ip
->ip_len
));
2065 mtemp
->m_pkthdr
.len
= mtemp
->m_len
;
2066 m_copydata(m
, 0, mtemp
->m_len
, mtod(mtemp
, void *));
2071 ip
->ip_ttl
-= IPTTLDEC
;
2074 * If forwarding packet using same interface that it came in on,
2075 * perhaps should send a redirect to sender to shortcut a hop.
2076 * Only send redirect if source is sending directly to us,
2077 * and if packet was not source routed (or has any options).
2078 * Also, don't send redirect if forwarding using a default route
2079 * or a route modified by a redirect.
2081 if (rt
->rt_ifp
== m
->m_pkthdr
.rcvif
&&
2082 !(rt
->rt_flags
& (RTF_DYNAMIC
| RTF_MODIFIED
)) &&
2083 satosin(rt_key(rt
))->sin_addr
.s_addr
!= INADDR_ANY
&&
2084 ipsendredirects
&& !using_srcrt
&& next_hop
== NULL
) {
2085 u_long src
= ntohl(ip
->ip_src
.s_addr
);
2086 struct in_ifaddr
*rt_ifa
= (struct in_ifaddr
*)rt
->rt_ifa
;
2088 if (rt_ifa
!= NULL
&&
2089 (src
& rt_ifa
->ia_subnetmask
) == rt_ifa
->ia_subnet
) {
2090 if (rt
->rt_flags
& RTF_GATEWAY
)
2091 dest
= satosin(rt
->rt_gateway
)->sin_addr
.s_addr
;
2093 dest
= pkt_dst
.s_addr
;
2095 * Router requirements says to only send
2098 type
= ICMP_REDIRECT
;
2099 code
= ICMP_REDIRECT_HOST
;
2102 kprintf("redirect (%d) to %x\n", code
, dest
);
2107 error
= ip_output(m
, NULL
, &fwd_ro
, IP_FORWARDING
, NULL
, NULL
);
2109 ipstat
.ips_forward
++;
2112 ipflow_create(&fwd_ro
, mtemp
);
2115 ipstat
.ips_redirectsent
++;
2117 ipstat
.ips_cantforward
++;
2124 * Errors that do not require generating ICMP message
2129 * A router should not generate ICMP_SOURCEQUENCH as
2130 * required in RFC1812 Requirements for IP Version 4 Routers.
2131 * Source quench could be a big problem under DoS attacks,
2132 * or if the underlying interface is rate-limited.
2133 * Those who need source quench packets may re-enable them
2134 * via the net.inet.ip.sendsourcequench sysctl.
2136 if (!ip_sendsourcequench
)
2140 case EACCES
: /* ipfw denied packet */
2144 KASSERT((mtemp
->m_flags
& M_EXT
) == 0 &&
2145 mtemp
->m_data
== mtemp
->m_pktdat
,
2146 ("ip_forward invalid mtemp2"));
2147 mcopy
= m_copym(mtemp
, 0, mtemp
->m_len
, M_NOWAIT
);
2152 * Send ICMP message.
2155 case 0: /* forwarded, but need redirect */
2156 /* type, code set above */
2159 case ENETUNREACH
: /* shouldn't happen, checked above */
2164 type
= ICMP_UNREACH
;
2165 code
= ICMP_UNREACH_HOST
;
2169 type
= ICMP_UNREACH
;
2170 code
= ICMP_UNREACH_NEEDFRAG
;
2171 if (fwd_ro
.ro_rt
!= NULL
)
2172 destmtu
= fwd_ro
.ro_rt
->rt_ifp
->if_mtu
;
2173 ipstat
.ips_cantfrag
++;
2177 type
= ICMP_SOURCEQUENCH
;
2181 case EACCES
: /* ipfw denied packet */
2182 panic("ip_forward EACCES should not reach");
2184 icmp_error(mcopy
, type
, code
, dest
, destmtu
);
2187 m_tag_delete_chain(mtemp
);
2188 if (fwd_ro
.ro_rt
!= NULL
)
2189 RTFREE(fwd_ro
.ro_rt
);
2193 ip_savecontrol(struct inpcb
*inp
, struct mbuf
**mp
, struct ip
*ip
,
2196 if (inp
->inp_socket
->so_options
& SO_TIMESTAMP
) {
2200 *mp
= sbcreatecontrol(&tv
, sizeof(tv
),
2201 SCM_TIMESTAMP
, SOL_SOCKET
);
2203 mp
= &(*mp
)->m_next
;
2205 if (inp
->inp_flags
& INP_RECVDSTADDR
) {
2206 *mp
= sbcreatecontrol(&ip
->ip_dst
, sizeof(struct in_addr
),
2207 IP_RECVDSTADDR
, IPPROTO_IP
);
2209 mp
= &(*mp
)->m_next
;
2211 if (inp
->inp_flags
& INP_RECVTTL
) {
2212 *mp
= sbcreatecontrol(&ip
->ip_ttl
, sizeof(u_char
),
2213 IP_RECVTTL
, IPPROTO_IP
);
2215 mp
= &(*mp
)->m_next
;
2217 if (inp
->inp_flags
& INP_RECVTOS
) {
2218 *mp
= sbcreatecontrol(&ip
->ip_tos
, sizeof(u_char
),
2219 IP_RECVTOS
, IPPROTO_IP
);
2221 mp
= &(*mp
)->m_next
;
2225 * Moving these out of udp_input() made them even more broken
2226 * than they already were.
2228 /* options were tossed already */
2229 if (inp
->inp_flags
& INP_RECVOPTS
) {
2230 *mp
= sbcreatecontrol(opts_deleted_above
,
2231 sizeof(struct in_addr
), IP_RECVOPTS
, IPPROTO_IP
);
2233 mp
= &(*mp
)->m_next
;
2235 /* ip_srcroute doesn't do what we want here, need to fix */
2236 if (inp
->inp_flags
& INP_RECVRETOPTS
) {
2237 *mp
= sbcreatecontrol(ip_srcroute(m
), sizeof(struct in_addr
),
2238 IP_RECVRETOPTS
, IPPROTO_IP
);
2240 mp
= &(*mp
)->m_next
;
2243 if (inp
->inp_flags
& INP_RECVIF
) {
2246 struct sockaddr_dl sdl
;
2249 struct sockaddr_dl
*sdp
;
2250 struct sockaddr_dl
*sdl2
= &sdlbuf
.sdl
;
2252 if (((ifp
= m
->m_pkthdr
.rcvif
)) &&
2253 ((ifp
->if_index
!= 0) && (ifp
->if_index
<= if_index
))) {
2254 sdp
= IF_LLSOCKADDR(ifp
);
2256 * Change our mind and don't try copy.
2258 if ((sdp
->sdl_family
!= AF_LINK
) ||
2259 (sdp
->sdl_len
> sizeof(sdlbuf
))) {
2262 bcopy(sdp
, sdl2
, sdp
->sdl_len
);
2266 offsetof(struct sockaddr_dl
, sdl_data
[0]);
2267 sdl2
->sdl_family
= AF_LINK
;
2268 sdl2
->sdl_index
= 0;
2269 sdl2
->sdl_nlen
= sdl2
->sdl_alen
= sdl2
->sdl_slen
= 0;
2271 *mp
= sbcreatecontrol(sdl2
, sdl2
->sdl_len
,
2272 IP_RECVIF
, IPPROTO_IP
);
2274 mp
= &(*mp
)->m_next
;
2279 * XXX these routines are called from the upper part of the kernel.
2281 * They could also be moved to ip_mroute.c, since all the RSVP
2282 * handling is done there already.
2285 ip_rsvp_init(struct socket
*so
)
2287 if (so
->so_type
!= SOCK_RAW
||
2288 so
->so_proto
->pr_protocol
!= IPPROTO_RSVP
)
2291 if (ip_rsvpd
!= NULL
)
2296 * This may seem silly, but we need to be sure we don't over-increment
2297 * the RSVP counter, in case something slips up.
2312 * This may seem silly, but we need to be sure we don't over-decrement
2313 * the RSVP counter, in case something slips up.
2323 rsvp_input(struct mbuf
**mp
, int *offp
, int proto
)
2325 struct mbuf
*m
= *mp
;
2329 if (rsvp_input_p
) { /* call the real one if loaded */
2331 rsvp_input_p(mp
, offp
, proto
);
2332 return(IPPROTO_DONE
);
2335 /* Can still get packets with rsvp_on = 0 if there is a local member
2336 * of the group to which the RSVP packet is addressed. But in this
2337 * case we want to throw the packet away.
2342 return(IPPROTO_DONE
);
2345 if (ip_rsvpd
!= NULL
) {
2347 rip_input(mp
, offp
, proto
);
2348 return(IPPROTO_DONE
);
2350 /* Drop the packet */
2352 return(IPPROTO_DONE
);