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
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12 * notice, this list of conditions and the following disclaimer.
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15 * documentation and/or other materials provided with the distribution.
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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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63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
67 * $FreeBSD: src/sys/netinet/ip_input.c,v 1.130.2.52 2003/03/07 07:01:28 silby Exp $
68 * $DragonFly: src/sys/netinet/ip_input.c,v 1.82 2008/07/03 08:22:36 corecode Exp $
73 #include "opt_bootp.h"
76 #include "opt_ipdivert.h"
77 #include "opt_ipfilter.h"
78 #include "opt_ipstealth.h"
79 #include "opt_ipsec.h"
81 #include <sys/param.h>
82 #include <sys/systm.h>
84 #include <sys/malloc.h>
85 #include <sys/mpipe.h>
86 #include <sys/domain.h>
87 #include <sys/protosw.h>
88 #include <sys/socket.h>
90 #include <sys/globaldata.h>
91 #include <sys/thread.h>
92 #include <sys/kernel.h>
93 #include <sys/syslog.h>
94 #include <sys/sysctl.h>
95 #include <sys/in_cksum.h>
97 #include <machine/stdarg.h>
100 #include <net/if_types.h>
101 #include <net/if_var.h>
102 #include <net/if_dl.h>
103 #include <net/pfil.h>
104 #include <net/route.h>
105 #include <net/netisr.h>
107 #include <netinet/in.h>
108 #include <netinet/in_systm.h>
109 #include <netinet/in_var.h>
110 #include <netinet/ip.h>
111 #include <netinet/in_pcb.h>
112 #include <netinet/ip_var.h>
113 #include <netinet/ip_icmp.h>
115 #include <sys/thread2.h>
116 #include <sys/msgport2.h>
117 #include <net/netmsg2.h>
119 #include <sys/socketvar.h>
121 #include <net/ipfw/ip_fw.h>
122 #include <net/dummynet/ip_dummynet.h>
125 #include <netinet6/ipsec.h>
126 #include <netproto/key/key.h>
130 #include <netproto/ipsec/ipsec.h>
131 #include <netproto/ipsec/key.h>
135 static int ip_rsvp_on
;
136 struct socket
*ip_rsvpd
;
138 int ipforwarding
= 0;
139 SYSCTL_INT(_net_inet_ip
, IPCTL_FORWARDING
, forwarding
, CTLFLAG_RW
,
140 &ipforwarding
, 0, "Enable IP forwarding between interfaces");
142 static int ipsendredirects
= 1; /* XXX */
143 SYSCTL_INT(_net_inet_ip
, IPCTL_SENDREDIRECTS
, redirect
, CTLFLAG_RW
,
144 &ipsendredirects
, 0, "Enable sending IP redirects");
146 int ip_defttl
= IPDEFTTL
;
147 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFTTL
, ttl
, CTLFLAG_RW
,
148 &ip_defttl
, 0, "Maximum TTL on IP packets");
150 static int ip_dosourceroute
= 0;
151 SYSCTL_INT(_net_inet_ip
, IPCTL_SOURCEROUTE
, sourceroute
, CTLFLAG_RW
,
152 &ip_dosourceroute
, 0, "Enable forwarding source routed IP packets");
154 static int ip_acceptsourceroute
= 0;
155 SYSCTL_INT(_net_inet_ip
, IPCTL_ACCEPTSOURCEROUTE
, accept_sourceroute
,
156 CTLFLAG_RW
, &ip_acceptsourceroute
, 0,
157 "Enable accepting source routed IP packets");
159 static int ip_keepfaith
= 0;
160 SYSCTL_INT(_net_inet_ip
, IPCTL_KEEPFAITH
, keepfaith
, CTLFLAG_RW
,
162 "Enable packet capture for FAITH IPv4->IPv6 translator daemon");
164 static int nipq
= 0; /* total # of reass queues */
166 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragpackets
, CTLFLAG_RW
,
168 "Maximum number of IPv4 fragment reassembly queue entries");
170 static int maxfragsperpacket
;
171 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, maxfragsperpacket
, CTLFLAG_RW
,
172 &maxfragsperpacket
, 0,
173 "Maximum number of IPv4 fragments allowed per packet");
175 static int ip_sendsourcequench
= 0;
176 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, sendsourcequench
, CTLFLAG_RW
,
177 &ip_sendsourcequench
, 0,
178 "Enable the transmission of source quench packets");
180 int ip_do_randomid
= 1;
181 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, random_id
, CTLFLAG_RW
,
183 "Assign random ip_id values");
185 * XXX - Setting ip_checkinterface mostly implements the receive side of
186 * the Strong ES model described in RFC 1122, but since the routing table
187 * and transmit implementation do not implement the Strong ES model,
188 * setting this to 1 results in an odd hybrid.
190 * XXX - ip_checkinterface currently must be disabled if you use ipnat
191 * to translate the destination address to another local interface.
193 * XXX - ip_checkinterface must be disabled if you add IP aliases
194 * to the loopback interface instead of the interface where the
195 * packets for those addresses are received.
197 static int ip_checkinterface
= 0;
198 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, check_interface
, CTLFLAG_RW
,
199 &ip_checkinterface
, 0, "Verify packet arrives on correct interface");
202 static int ipprintfs
= 0;
205 extern struct domain inetdomain
;
206 extern struct protosw inetsw
[];
207 u_char ip_protox
[IPPROTO_MAX
];
208 struct in_ifaddrhead in_ifaddrheads
[MAXCPU
]; /* first inet address */
209 struct in_ifaddrhashhead
*in_ifaddrhashtbls
[MAXCPU
];
210 /* inet addr hash table */
211 u_long in_ifaddrhmask
; /* mask for hash table */
213 struct ip_stats ipstats_percpu
[MAXCPU
];
216 sysctl_ipstats(SYSCTL_HANDLER_ARGS
)
220 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
221 if ((error
= SYSCTL_OUT(req
, &ipstats_percpu
[cpu
],
222 sizeof(struct ip_stats
))))
224 if ((error
= SYSCTL_IN(req
, &ipstats_percpu
[cpu
],
225 sizeof(struct ip_stats
))))
231 SYSCTL_PROC(_net_inet_ip
, IPCTL_STATS
, stats
, (CTLTYPE_OPAQUE
| CTLFLAG_RW
),
232 0, 0, sysctl_ipstats
, "S,ip_stats", "IP statistics");
234 SYSCTL_STRUCT(_net_inet_ip
, IPCTL_STATS
, stats
, CTLFLAG_RW
,
235 &ipstat
, ip_stats
, "IP statistics");
238 /* Packet reassembly stuff */
239 #define IPREASS_NHASH_LOG2 6
240 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
241 #define IPREASS_HMASK (IPREASS_NHASH - 1)
242 #define IPREASS_HASH(x,y) \
243 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
245 static struct ipq ipq
[IPREASS_NHASH
];
248 SYSCTL_INT(_net_inet_ip
, IPCTL_DEFMTU
, mtu
, CTLFLAG_RW
,
249 &ip_mtu
, 0, "Default MTU");
253 static int ipstealth
= 0;
254 SYSCTL_INT(_net_inet_ip
, OID_AUTO
, stealth
, CTLFLAG_RW
, &ipstealth
, 0, "");
256 static const int ipstealth
= 0;
261 ip_fw_chk_t
*ip_fw_chk_ptr
;
262 ip_fw_dn_io_t
*ip_fw_dn_io_ptr
;
266 struct pfil_head inet_pfil_hook
;
269 * XXX this is ugly -- the following two global variables are
270 * used to store packet state while it travels through the stack.
271 * 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
281 static int ip_nhops
= 0;
283 static struct ip_srcrt
{
284 struct in_addr dst
; /* final destination */
285 char nop
; /* one NOP to align */
286 char srcopt
[IPOPT_OFFSET
+ 1]; /* OPTVAL, OLEN and OFFSET */
287 struct in_addr route
[MAX_IPOPTLEN
/sizeof(struct in_addr
)];
290 static MALLOC_DEFINE(M_IPQ
, "ipq", "IP Fragment Management");
291 static struct malloc_pipe ipq_mpipe
;
293 static void save_rte (u_char
*, struct in_addr
);
294 static int ip_dooptions (struct mbuf
*m
, int,
295 struct sockaddr_in
*next_hop
);
296 static void ip_freef (struct ipq
*);
297 static void ip_input_handler (struct netmsg
*);
298 static struct mbuf
*ip_reass (struct mbuf
*, struct ipq
*,
299 struct ipq
*, u_int32_t
*);
302 * IP initialization: fill in IP protocol switch table.
303 * All protocols not implemented in kernel go to raw IP protocol handler.
315 * Make sure we can handle a reasonable number of fragments but
316 * cap it at 4000 (XXX).
318 mpipe_init(&ipq_mpipe
, M_IPQ
, sizeof(struct ipq
),
319 IFQ_MAXLEN
, 4000, 0, NULL
);
320 for (i
= 0; i
< ncpus
; ++i
) {
321 TAILQ_INIT(&in_ifaddrheads
[i
]);
322 in_ifaddrhashtbls
[i
] =
323 hashinit(INADDR_NHASH
, M_IFADDR
, &in_ifaddrhmask
);
325 pr
= pffindproto(PF_INET
, IPPROTO_RAW
, SOCK_RAW
);
328 for (i
= 0; i
< IPPROTO_MAX
; i
++)
329 ip_protox
[i
] = pr
- inetsw
;
330 for (pr
= inetdomain
.dom_protosw
;
331 pr
< inetdomain
.dom_protoswNPROTOSW
; pr
++)
332 if (pr
->pr_domain
->dom_family
== PF_INET
&&
333 pr
->pr_protocol
&& pr
->pr_protocol
!= IPPROTO_RAW
)
334 ip_protox
[pr
->pr_protocol
] = pr
- inetsw
;
336 inet_pfil_hook
.ph_type
= PFIL_TYPE_AF
;
337 inet_pfil_hook
.ph_af
= AF_INET
;
338 if ((i
= pfil_head_register(&inet_pfil_hook
)) != 0) {
339 kprintf("%s: WARNING: unable to register pfil hook, "
340 "error %d\n", __func__
, i
);
343 for (i
= 0; i
< IPREASS_NHASH
; i
++)
344 ipq
[i
].next
= ipq
[i
].prev
= &ipq
[i
];
346 maxnipq
= nmbclusters
/ 32;
347 maxfragsperpacket
= 16;
349 ip_id
= time_second
& 0xffff;
352 * Initialize IP statistics counters for each CPU.
356 for (cpu
= 0; cpu
< ncpus
; ++cpu
) {
357 bzero(&ipstats_percpu
[cpu
], sizeof(struct ip_stats
));
360 bzero(&ipstat
, sizeof(struct ip_stats
));
363 netisr_register(NETISR_IP
, ip_mport_in
, ip_input_handler
);
367 * XXX watch out this one. It is perhaps used as a cache for
368 * the most recently used route ? it is cleared in in_addroute()
369 * when a new route is successfully created.
371 struct route ipforward_rt
[MAXCPU
];
373 /* Do transport protocol processing. */
375 transport_processing_oncpu(struct mbuf
*m
, int hlen
, struct ip
*ip
,
376 struct sockaddr_in
*nexthop
)
379 * Switch out to protocol's input routine.
381 if (nexthop
&& ip
->ip_p
== IPPROTO_TCP
) {
382 /* TCP needs IPFORWARD info if available */
385 tag
.mh_type
= MT_TAG
;
386 tag
.mh_flags
= PACKET_TAG_IPFORWARD
;
387 tag
.mh_data
= (caddr_t
)nexthop
;
390 (*inetsw
[ip_protox
[ip
->ip_p
]].pr_input
)
391 ((struct mbuf
*)&tag
, hlen
, ip
->ip_p
);
393 (*inetsw
[ip_protox
[ip
->ip_p
]].pr_input
)(m
, hlen
, ip
->ip_p
);
397 struct netmsg_transport_packet
{
398 struct netmsg nm_netmsg
;
399 struct mbuf
*nm_mbuf
;
401 boolean_t nm_hasnexthop
;
402 struct sockaddr_in nm_nexthop
;
406 transport_processing_handler(netmsg_t netmsg
)
408 struct netmsg_transport_packet
*msg
= (void *)netmsg
;
409 struct sockaddr_in
*nexthop
;
412 ip
= mtod(msg
->nm_mbuf
, struct ip
*);
413 nexthop
= msg
->nm_hasnexthop
? &msg
->nm_nexthop
: NULL
;
414 transport_processing_oncpu(msg
->nm_mbuf
, msg
->nm_hlen
, ip
, nexthop
);
415 lwkt_replymsg(&msg
->nm_netmsg
.nm_lmsg
, 0);
419 ip_input_handler(struct netmsg
*msg0
)
421 struct mbuf
*m
= ((struct netmsg_packet
*)msg0
)->nm_packet
;
424 /* msg0 was embedded in the mbuf, do not reply! */
428 * IP input routine. Checksum and byte swap header. If fragmented
429 * try to reassemble. Process options. Pass to next level.
432 ip_input(struct mbuf
*m
)
436 struct in_ifaddr
*ia
= NULL
;
437 struct in_ifaddr_container
*iac
;
438 int i
, hlen
, checkif
;
440 struct in_addr pkt_dst
;
441 u_int32_t divert_info
= 0; /* packet divert/tee info */
442 struct ip_fw_args args
;
443 boolean_t using_srcrt
= FALSE
; /* forward (by PFIL_HOOKS) */
444 boolean_t needredispatch
= FALSE
;
445 struct in_addr odst
; /* original dst address(NAT) */
448 struct tdb_ident
*tdbi
;
449 struct secpolicy
*sp
;
456 args
.next_hop
= NULL
;
458 /* Grab info from MT_TAG mbufs prepended to the chain. */
459 while (m
!= NULL
&& m
->m_type
== MT_TAG
) {
460 switch(m
->_m_tag_id
) {
461 case PACKET_TAG_IPFORWARD
:
462 args
.next_hop
= (struct sockaddr_in
*)m
->m_hdr
.mh_data
;
465 kprintf("ip_input: unrecognised MT_TAG tag %d\n",
473 /* Extract info from dummynet tag */
474 mtag
= m_tag_find(m
, PACKET_TAG_DUMMYNET
, NULL
);
476 args
.rule
= ((struct dn_pkt
*)m_tag_data(mtag
))->dn_priv
;
478 m_tag_delete(m
, mtag
);
482 if (args
.rule
!= NULL
) { /* dummynet already filtered us */
483 ip
= mtod(m
, struct ip
*);
484 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
490 /* length checks already done in ip_demux() */
491 KASSERT(m
->m_len
>= sizeof(ip
), ("IP header not in one mbuf"));
493 ip
= mtod(m
, struct ip
*);
495 if (IP_VHL_V(ip
->ip_vhl
) != IPVERSION
) {
496 ipstat
.ips_badvers
++;
500 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
501 /* length checks already done in ip_demux() */
502 KASSERT(hlen
>= sizeof(struct ip
), ("IP header len too small"));
503 KASSERT(m
->m_len
>= hlen
, ("packet shorter than IP header length"));
505 /* 127/8 must not appear on wire - RFC1122 */
506 if ((ntohl(ip
->ip_dst
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
||
507 (ntohl(ip
->ip_src
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
) {
508 if (!(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
)) {
509 ipstat
.ips_badaddr
++;
514 if (m
->m_pkthdr
.csum_flags
& CSUM_IP_CHECKED
) {
515 sum
= !(m
->m_pkthdr
.csum_flags
& CSUM_IP_VALID
);
517 if (hlen
== sizeof(struct ip
)) {
518 sum
= in_cksum_hdr(ip
);
520 sum
= in_cksum(m
, hlen
);
529 if (altq_input
!= NULL
&& (*altq_input
)(m
, AF_INET
) == 0) {
530 /* packet is dropped by traffic conditioner */
535 * Convert fields to host representation.
537 ip
->ip_len
= ntohs(ip
->ip_len
);
538 if (ip
->ip_len
< hlen
) {
542 ip
->ip_off
= ntohs(ip
->ip_off
);
545 * Check that the amount of data in the buffers
546 * is as at least much as the IP header would have us expect.
547 * Trim mbufs if longer than we expect.
548 * Drop packet if shorter than we expect.
550 if (m
->m_pkthdr
.len
< ip
->ip_len
) {
551 ipstat
.ips_tooshort
++;
554 if (m
->m_pkthdr
.len
> ip
->ip_len
) {
555 if (m
->m_len
== m
->m_pkthdr
.len
) {
556 m
->m_len
= ip
->ip_len
;
557 m
->m_pkthdr
.len
= ip
->ip_len
;
559 m_adj(m
, ip
->ip_len
- m
->m_pkthdr
.len
);
561 #if defined(IPSEC) && !defined(IPSEC_FILTERGIF)
563 * Bypass packet filtering for packets from a tunnel (gif).
565 if (ipsec_gethist(m
, NULL
))
571 * Right now when no processing on packet has done
572 * and it is still fresh out of network we do our black
574 * - Firewall: deny/allow/divert
575 * - Xlate: translate packet's addr/port (NAT).
576 * - Pipe: pass pkt through dummynet.
577 * - Wrap: fake packet's addr/port <unimpl.>
578 * - Encapsulate: put it in another IP and send out. <unimp.>
584 * Run through list of hooks for input packets.
586 * NB: Beware of the destination address changing (e.g.
587 * by NAT rewriting). When this happens, tell
588 * ip_forward to do the right thing.
590 if (pfil_has_hooks(&inet_pfil_hook
)) {
592 if (pfil_run_hooks(&inet_pfil_hook
, &m
,
593 m
->m_pkthdr
.rcvif
, PFIL_IN
)) {
596 if (m
== NULL
) /* consumed by filter */
598 ip
= mtod(m
, struct ip
*);
599 using_srcrt
= (odst
.s_addr
!= ip
->ip_dst
.s_addr
);
602 if (fw_enable
&& IPFW_LOADED
) {
604 * If we've been forwarded from the output side, then
605 * skip the firewall a second time
607 if (args
.next_hop
!= NULL
)
611 i
= ip_fw_chk_ptr(&args
);
614 if ((i
& IP_FW_PORT_DENY_FLAG
) || m
== NULL
) { /* drop */
619 ip
= mtod(m
, struct ip
*); /* just in case m changed */
620 if (i
== 0 && args
.next_hop
== NULL
) /* common case */
622 if (i
& IP_FW_PORT_DYNT_FLAG
) {
623 /* Send packet to the appropriate pipe */
624 ip_fw_dn_io_ptr(m
, i
&0xffff, DN_TO_IP_IN
, &args
);
628 if (i
!= 0 && !(i
& IP_FW_PORT_DYNT_FLAG
)) {
629 /* Divert or tee packet */
634 if (i
== 0 && args
.next_hop
!= NULL
)
637 * if we get here, the packet must be dropped
645 * Process options and, if not destined for us,
646 * ship it on. ip_dooptions returns 1 when an
647 * error was detected (causing an icmp message
648 * to be sent and the original packet to be freed).
650 ip_nhops
= 0; /* for source routed packets */
651 if (hlen
> sizeof(struct ip
) && ip_dooptions(m
, 0, args
.next_hop
))
654 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
655 * matter if it is destined to another node, or whether it is
656 * a multicast one, RSVP wants it! and prevents it from being forwarded
657 * anywhere else. Also checks if the rsvp daemon is running before
658 * grabbing the packet.
660 if (rsvp_on
&& ip
->ip_p
== IPPROTO_RSVP
)
664 * Check our list of addresses, to see if the packet is for us.
665 * If we don't have any addresses, assume any unicast packet
666 * we receive might be for us (and let the upper layers deal
669 if (TAILQ_EMPTY(&in_ifaddrheads
[mycpuid
]) &&
670 !(m
->m_flags
& (M_MCAST
| M_BCAST
)))
674 * Cache the destination address of the packet; this may be
675 * changed by use of 'ipfw fwd'.
677 pkt_dst
= args
.next_hop
? args
.next_hop
->sin_addr
: ip
->ip_dst
;
680 * Enable a consistency check between the destination address
681 * and the arrival interface for a unicast packet (the RFC 1122
682 * strong ES model) if IP forwarding is disabled and the packet
683 * is not locally generated and the packet is not subject to
686 * XXX - Checking also should be disabled if the destination
687 * address is ipnat'ed to a different interface.
689 * XXX - Checking is incompatible with IP aliases added
690 * to the loopback interface instead of the interface where
691 * the packets are received.
693 checkif
= ip_checkinterface
&&
695 m
->m_pkthdr
.rcvif
!= NULL
&&
696 !(m
->m_pkthdr
.rcvif
->if_flags
& IFF_LOOPBACK
) &&
697 (args
.next_hop
== NULL
);
700 * Check for exact addresses in the hash bucket.
702 LIST_FOREACH(iac
, INADDR_HASH(pkt_dst
.s_addr
), ia_hash
) {
706 * If the address matches, verify that the packet
707 * arrived via the correct interface if checking is
710 if (IA_SIN(ia
)->sin_addr
.s_addr
== pkt_dst
.s_addr
&&
711 (!checkif
|| ia
->ia_ifp
== m
->m_pkthdr
.rcvif
))
717 * Check for broadcast addresses.
719 * Only accept broadcast packets that arrive via the matching
720 * interface. Reception of forwarded directed broadcasts would
721 * be handled via ip_forward() and ether_output() with the loopback
722 * into the stack for SIMPLEX interfaces handled by ether_output().
724 if (m
->m_pkthdr
.rcvif
->if_flags
& IFF_BROADCAST
) {
725 struct ifaddr_container
*ifac
;
727 TAILQ_FOREACH(ifac
, &m
->m_pkthdr
.rcvif
->if_addrheads
[mycpuid
],
729 struct ifaddr
*ifa
= ifac
->ifa
;
731 if (ifa
->ifa_addr
== NULL
) /* shutdown/startup race */
733 if (ifa
->ifa_addr
->sa_family
!= AF_INET
)
736 if (satosin(&ia
->ia_broadaddr
)->sin_addr
.s_addr
==
739 if (ia
->ia_netbroadcast
.s_addr
== pkt_dst
.s_addr
)
742 if (IA_SIN(ia
)->sin_addr
.s_addr
== INADDR_ANY
)
747 if (IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
))) {
748 struct in_multi
*inm
;
750 if (ip_mrouter
!= NULL
) {
752 * If we are acting as a multicast router, all
753 * incoming multicast packets are passed to the
754 * kernel-level multicast forwarding function.
755 * The packet is returned (relatively) intact; if
756 * ip_mforward() returns a non-zero value, the packet
757 * must be discarded, else it may be accepted below.
759 if (ip_mforward
!= NULL
&&
760 ip_mforward(ip
, m
->m_pkthdr
.rcvif
, m
, NULL
) != 0) {
761 ipstat
.ips_cantforward
++;
767 * The process-level routing daemon needs to receive
768 * all multicast IGMP packets, whether or not this
769 * host belongs to their destination groups.
771 if (ip
->ip_p
== IPPROTO_IGMP
)
773 ipstat
.ips_forward
++;
776 * See if we belong to the destination multicast group on the
779 IN_LOOKUP_MULTI(ip
->ip_dst
, m
->m_pkthdr
.rcvif
, inm
);
781 ipstat
.ips_notmember
++;
787 if (ip
->ip_dst
.s_addr
== INADDR_BROADCAST
)
789 if (ip
->ip_dst
.s_addr
== INADDR_ANY
)
793 * FAITH(Firewall Aided Internet Translator)
795 if (m
->m_pkthdr
.rcvif
&& m
->m_pkthdr
.rcvif
->if_type
== IFT_FAITH
) {
797 if (ip
->ip_p
== IPPROTO_TCP
|| ip
->ip_p
== IPPROTO_ICMP
)
805 * Not for us; forward if possible and desirable.
808 ipstat
.ips_cantforward
++;
813 * Enforce inbound IPsec SPD.
815 if (ipsec4_in_reject(m
, NULL
)) {
816 ipsecstat
.in_polvio
++;
821 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
824 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
825 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
827 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
828 IP_FORWARDING
, &error
);
830 if (sp
== NULL
) { /* NB: can happen if error */
832 /*XXX error stat???*/
833 DPRINTF(("ip_input: no SP for forwarding\n")); /*XXX*/
838 * Check security policy against packet attributes.
840 error
= ipsec_in_reject(sp
, m
);
844 ipstat
.ips_cantforward
++;
848 ip_forward(m
, using_srcrt
, args
.next_hop
);
855 * IPSTEALTH: Process non-routing options only
856 * if the packet is destined for us.
859 hlen
> sizeof(struct ip
) &&
860 ip_dooptions(m
, 1, args
.next_hop
))
863 /* Count the packet in the ip address stats */
865 ia
->ia_ifa
.if_ipackets
++;
866 ia
->ia_ifa
.if_ibytes
+= m
->m_pkthdr
.len
;
870 * If offset or IP_MF are set, must reassemble.
871 * Otherwise, nothing need be done.
872 * (We could look in the reassembly queue to see
873 * if the packet was previously fragmented,
874 * but it's not worth the time; just let them time out.)
876 if (ip
->ip_off
& (IP_MF
| IP_OFFMASK
)) {
878 /* If maxnipq is 0, never accept fragments. */
880 ipstat
.ips_fragments
++;
881 ipstat
.ips_fragdropped
++;
885 sum
= IPREASS_HASH(ip
->ip_src
.s_addr
, ip
->ip_id
);
887 * Look for queue of fragments
890 for (fp
= ipq
[sum
].next
; fp
!= &ipq
[sum
]; fp
= fp
->next
)
891 if (ip
->ip_id
== fp
->ipq_id
&&
892 ip
->ip_src
.s_addr
== fp
->ipq_src
.s_addr
&&
893 ip
->ip_dst
.s_addr
== fp
->ipq_dst
.s_addr
&&
894 ip
->ip_p
== fp
->ipq_p
)
900 * Enforce upper bound on number of fragmented packets
901 * for which we attempt reassembly;
902 * If maxnipq is -1, accept all fragments without limitation.
904 if ((nipq
> maxnipq
) && (maxnipq
> 0)) {
906 * drop something from the tail of the current queue
907 * before proceeding further
909 if (ipq
[sum
].prev
== &ipq
[sum
]) { /* gak */
910 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
911 if (ipq
[i
].prev
!= &ipq
[i
]) {
912 ipstat
.ips_fragtimeout
+=
913 ipq
[i
].prev
->ipq_nfrags
;
914 ip_freef(ipq
[i
].prev
);
919 ipstat
.ips_fragtimeout
+=
920 ipq
[sum
].prev
->ipq_nfrags
;
921 ip_freef(ipq
[sum
].prev
);
926 * Adjust ip_len to not reflect header,
927 * convert offset of this to bytes.
930 if (ip
->ip_off
& IP_MF
) {
932 * Make sure that fragments have a data length
933 * that's a non-zero multiple of 8 bytes.
935 if (ip
->ip_len
== 0 || (ip
->ip_len
& 0x7) != 0) {
936 ipstat
.ips_toosmall
++; /* XXX */
939 m
->m_flags
|= M_FRAG
;
941 m
->m_flags
&= ~M_FRAG
;
945 * Attempt reassembly; if it succeeds, proceed.
946 * ip_reass() will return a different mbuf, and update
947 * the divert info in divert_info.
949 ipstat
.ips_fragments
++;
950 m
->m_pkthdr
.header
= ip
;
951 m
= ip_reass(m
, fp
, &ipq
[sum
], &divert_info
);
954 ipstat
.ips_reassembled
++;
955 needredispatch
= TRUE
;
956 ip
= mtod(m
, struct ip
*);
957 /* Get the header length of the reassembled packet */
958 hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
960 /* Restore original checksum before diverting packet */
961 if (divert_info
!= 0) {
963 ip
->ip_len
= htons(ip
->ip_len
);
964 ip
->ip_off
= htons(ip
->ip_off
);
966 if (hlen
== sizeof(struct ip
))
967 ip
->ip_sum
= in_cksum_hdr(ip
);
969 ip
->ip_sum
= in_cksum(m
, hlen
);
970 ip
->ip_off
= ntohs(ip
->ip_off
);
971 ip
->ip_len
= ntohs(ip
->ip_len
);
981 * Divert or tee packet to the divert protocol if required.
983 if (divert_info
!= 0) {
984 struct mbuf
*clone
= NULL
;
986 /* Clone packet if we're doing a 'tee' */
987 if ((divert_info
& IP_FW_PORT_TEE_FLAG
) != 0)
988 clone
= m_dup(m
, MB_DONTWAIT
);
990 /* Restore packet header fields to original values */
992 ip
->ip_len
= htons(ip
->ip_len
);
993 ip
->ip_off
= htons(ip
->ip_off
);
995 /* Deliver packet to divert input routine */
996 divert_packet(m
, 1, divert_info
& 0xffff);
997 ipstat
.ips_delivered
++;
999 /* If 'tee', continue with original packet */
1003 ip
= mtod(m
, struct ip
*);
1006 * Jump backwards to complete processing of the
1007 * packet. But first clear divert_info to avoid
1008 * entering this block again.
1009 * We do not need to clear args.divert_rule
1010 * or args.next_hop as they will not be used.
1012 * XXX Better safe than sorry, remove the DIVERT tag.
1014 mtag
= m_tag_find(m
, PACKET_TAG_IPFW_DIVERT
, NULL
);
1016 m_tag_delete(m
, mtag
);
1025 * enforce IPsec policy checking if we are seeing last header.
1026 * note that we do not visit this with protocols with pcb layer
1027 * code - like udp/tcp/raw ip.
1029 if ((inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) &&
1030 ipsec4_in_reject(m
, NULL
)) {
1031 ipsecstat
.in_polvio
++;
1037 * enforce IPsec policy checking if we are seeing last header.
1038 * note that we do not visit this with protocols with pcb layer
1039 * code - like udp/tcp/raw ip.
1041 if (inetsw
[ip_protox
[ip
->ip_p
]].pr_flags
& PR_LASTHDR
) {
1043 * Check if the packet has already had IPsec processing
1044 * done. If so, then just pass it along. This tag gets
1045 * set during AH, ESP, etc. input handling, before the
1046 * packet is returned to the ip input queue for delivery.
1048 mtag
= m_tag_find(m
, PACKET_TAG_IPSEC_IN_DONE
, NULL
);
1051 tdbi
= (struct tdb_ident
*)m_tag_data(mtag
);
1052 sp
= ipsec_getpolicy(tdbi
, IPSEC_DIR_INBOUND
);
1054 sp
= ipsec_getpolicybyaddr(m
, IPSEC_DIR_INBOUND
,
1055 IP_FORWARDING
, &error
);
1059 * Check security policy against packet attributes.
1061 error
= ipsec_in_reject(sp
, m
);
1064 /* XXX error stat??? */
1066 DPRINTF(("ip_input: no SP, packet discarded\n"));/*XXX*/
1073 #endif /* FAST_IPSEC */
1075 ipstat
.ips_delivered
++;
1076 if (needredispatch
) {
1077 struct netmsg_transport_packet
*msg
;
1080 ip
->ip_off
= htons(ip
->ip_off
);
1081 ip
->ip_len
= htons(ip
->ip_len
);
1082 port
= ip_mport_in(&m
);
1086 msg
= kmalloc(sizeof(struct netmsg_transport_packet
), M_LWKTMSG
,
1087 M_INTWAIT
| M_NULLOK
);
1091 netmsg_init(&msg
->nm_netmsg
, &netisr_afree_rport
, 0,
1092 transport_processing_handler
);
1093 msg
->nm_hlen
= hlen
;
1094 msg
->nm_hasnexthop
= (args
.next_hop
!= NULL
);
1095 if (msg
->nm_hasnexthop
)
1096 msg
->nm_nexthop
= *args
.next_hop
; /* structure copy */
1099 ip
= mtod(m
, struct ip
*);
1100 ip
->ip_len
= ntohs(ip
->ip_len
);
1101 ip
->ip_off
= ntohs(ip
->ip_off
);
1102 lwkt_sendmsg(port
, &msg
->nm_netmsg
.nm_lmsg
);
1104 transport_processing_oncpu(m
, hlen
, ip
, args
.next_hop
);
1113 * Take incoming datagram fragment and try to reassemble it into
1114 * whole datagram. If a chain for reassembly of this datagram already
1115 * exists, then it is given as fp; otherwise have to make a chain.
1117 * When IPDIVERT enabled, keep additional state with each packet that
1118 * tells us if we need to divert or tee the packet we're building.
1119 * In particular, *divinfo includes the port and TEE flag.
1122 static struct mbuf
*
1123 ip_reass(struct mbuf
*m
, struct ipq
*fp
, struct ipq
*where
,
1126 struct ip
*ip
= mtod(m
, struct ip
*);
1127 struct mbuf
*p
= NULL
, *q
, *nq
;
1129 int hlen
= IP_VHL_HL(ip
->ip_vhl
) << 2;
1136 * If the hardware has not done csum over this fragment
1137 * then csum_data is not valid at all.
1139 if ((m
->m_pkthdr
.csum_flags
& (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
))
1140 == (CSUM_FRAG_NOT_CHECKED
| CSUM_DATA_VALID
)) {
1141 m
->m_pkthdr
.csum_data
= 0;
1142 m
->m_pkthdr
.csum_flags
&= ~(CSUM_DATA_VALID
| CSUM_PSEUDO_HDR
);
1146 * Presence of header sizes in mbufs
1147 * would confuse code below.
1153 * If first fragment to arrive, create a reassembly queue.
1156 if ((fp
= mpipe_alloc_nowait(&ipq_mpipe
)) == NULL
)
1161 fp
->ipq_ttl
= IPFRAGTTL
;
1162 fp
->ipq_p
= ip
->ip_p
;
1163 fp
->ipq_id
= ip
->ip_id
;
1164 fp
->ipq_src
= ip
->ip_src
;
1165 fp
->ipq_dst
= ip
->ip_dst
;
1167 m
->m_nextpkt
= NULL
;
1169 fp
->ipq_div_info
= 0;
1176 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
1179 * Find a segment which begins after this one does.
1181 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
)
1182 if (GETIP(q
)->ip_off
> ip
->ip_off
)
1186 * If there is a preceding segment, it may provide some of
1187 * our data already. If so, drop the data from the incoming
1188 * segment. If it provides all of our data, drop us, otherwise
1189 * stick new segment in the proper place.
1191 * If some of the data is dropped from the the preceding
1192 * segment, then it's checksum is invalidated.
1195 i
= GETIP(p
)->ip_off
+ GETIP(p
)->ip_len
- ip
->ip_off
;
1197 if (i
>= ip
->ip_len
)
1200 m
->m_pkthdr
.csum_flags
= 0;
1204 m
->m_nextpkt
= p
->m_nextpkt
;
1207 m
->m_nextpkt
= fp
->ipq_frags
;
1212 * While we overlap succeeding segments trim them or,
1213 * if they are completely covered, dequeue them.
1215 for (; q
!= NULL
&& ip
->ip_off
+ ip
->ip_len
> GETIP(q
)->ip_off
;
1217 i
= (ip
->ip_off
+ ip
->ip_len
) - GETIP(q
)->ip_off
;
1218 if (i
< GETIP(q
)->ip_len
) {
1219 GETIP(q
)->ip_len
-= i
;
1220 GETIP(q
)->ip_off
+= i
;
1222 q
->m_pkthdr
.csum_flags
= 0;
1227 ipstat
.ips_fragdropped
++;
1229 q
->m_nextpkt
= NULL
;
1237 * Transfer firewall instructions to the fragment structure.
1238 * Only trust info in the fragment at offset 0.
1240 if (ip
->ip_off
== 0) {
1241 fp
->ipq_div_info
= *divinfo
;
1243 mtag
= m_tag_find(m
, PACKET_TAG_IPFW_DIVERT
, NULL
);
1245 m_tag_delete(m
, mtag
);
1251 * Check for complete reassembly and perform frag per packet
1254 * Frag limiting is performed here so that the nth frag has
1255 * a chance to complete the packet before we drop the packet.
1256 * As a result, n+1 frags are actually allowed per packet, but
1257 * only n will ever be stored. (n = maxfragsperpacket.)
1261 for (p
= NULL
, q
= fp
->ipq_frags
; q
; p
= q
, q
= q
->m_nextpkt
) {
1262 if (GETIP(q
)->ip_off
!= next
) {
1263 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1264 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1269 next
+= GETIP(q
)->ip_len
;
1271 /* Make sure the last packet didn't have the IP_MF flag */
1272 if (p
->m_flags
& M_FRAG
) {
1273 if (fp
->ipq_nfrags
> maxfragsperpacket
) {
1274 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1281 * Reassembly is complete. Make sure the packet is a sane size.
1285 if (next
+ (IP_VHL_HL(ip
->ip_vhl
) << 2) > IP_MAXPACKET
) {
1286 ipstat
.ips_toolong
++;
1287 ipstat
.ips_fragdropped
+= fp
->ipq_nfrags
;
1293 * Concatenate fragments.
1300 q
->m_nextpkt
= NULL
;
1301 for (q
= nq
; q
!= NULL
; q
= nq
) {
1303 q
->m_nextpkt
= NULL
;
1304 m
->m_pkthdr
.csum_flags
&= q
->m_pkthdr
.csum_flags
;
1305 m
->m_pkthdr
.csum_data
+= q
->m_pkthdr
.csum_data
;
1310 * Clean up the 1's complement checksum. Carry over 16 bits must
1311 * be added back. This assumes no more then 65535 packet fragments
1312 * were reassembled. A second carry can also occur (but not a third).
1314 m
->m_pkthdr
.csum_data
= (m
->m_pkthdr
.csum_data
& 0xffff) +
1315 (m
->m_pkthdr
.csum_data
>> 16);
1316 if (m
->m_pkthdr
.csum_data
> 0xFFFF)
1317 m
->m_pkthdr
.csum_data
-= 0xFFFF;
1322 * Extract firewall instructions from the fragment structure.
1324 *divinfo
= fp
->ipq_div_info
;
1328 * Create header for new ip packet by
1329 * modifying header of first packet;
1330 * dequeue and discard fragment reassembly header.
1331 * Make header visible.
1334 ip
->ip_src
= fp
->ipq_src
;
1335 ip
->ip_dst
= fp
->ipq_dst
;
1338 mpipe_free(&ipq_mpipe
, fp
);
1339 m
->m_len
+= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1340 m
->m_data
-= (IP_VHL_HL(ip
->ip_vhl
) << 2);
1341 /* some debugging cruft by sklower, below, will go away soon */
1342 if (m
->m_flags
& M_PKTHDR
) { /* XXX this should be done elsewhere */
1345 for (n
= m
; n
; n
= n
->m_next
)
1347 m
->m_pkthdr
.len
= plen
;
1355 ipstat
.ips_fragdropped
++;
1365 * Free a fragment reassembly header and all
1366 * associated datagrams.
1369 ip_freef(struct ipq
*fp
)
1373 while (fp
->ipq_frags
) {
1375 fp
->ipq_frags
= q
->m_nextpkt
;
1376 q
->m_nextpkt
= NULL
;
1380 mpipe_free(&ipq_mpipe
, fp
);
1385 * IP timer processing;
1386 * if a timer expires on a reassembly
1387 * queue, discard it.
1396 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1400 while (fp
!= &ipq
[i
]) {
1403 if (fp
->prev
->ipq_ttl
== 0) {
1404 ipstat
.ips_fragtimeout
+= fp
->prev
->ipq_nfrags
;
1410 * If we are over the maximum number of fragments
1411 * (due to the limit being lowered), drain off
1412 * enough to get down to the new limit.
1414 if (maxnipq
>= 0 && nipq
> maxnipq
) {
1415 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1416 while (nipq
> maxnipq
&&
1417 (ipq
[i
].next
!= &ipq
[i
])) {
1418 ipstat
.ips_fragdropped
+=
1419 ipq
[i
].next
->ipq_nfrags
;
1420 ip_freef(ipq
[i
].next
);
1429 * Drain off all datagram fragments.
1436 for (i
= 0; i
< IPREASS_NHASH
; i
++) {
1437 while (ipq
[i
].next
!= &ipq
[i
]) {
1438 ipstat
.ips_fragdropped
+= ipq
[i
].next
->ipq_nfrags
;
1439 ip_freef(ipq
[i
].next
);
1446 * Do option processing on a datagram,
1447 * possibly discarding it if bad options are encountered,
1448 * or forwarding it if source-routed.
1449 * The pass argument is used when operating in the IPSTEALTH
1450 * mode to tell what options to process:
1451 * [LS]SRR (pass 0) or the others (pass 1).
1452 * The reason for as many as two passes is that when doing IPSTEALTH,
1453 * non-routing options should be processed only if the packet is for us.
1454 * Returns 1 if packet has been forwarded/freed,
1455 * 0 if the packet should be processed further.
1458 ip_dooptions(struct mbuf
*m
, int pass
, struct sockaddr_in
*next_hop
)
1460 struct sockaddr_in ipaddr
= { sizeof ipaddr
, AF_INET
};
1461 struct ip
*ip
= mtod(m
, struct ip
*);
1463 struct in_ifaddr
*ia
;
1464 int opt
, optlen
, cnt
, off
, code
, type
= ICMP_PARAMPROB
;
1465 boolean_t forward
= FALSE
;
1466 struct in_addr
*sin
, dst
;
1470 cp
= (u_char
*)(ip
+ 1);
1471 cnt
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1472 for (; cnt
> 0; cnt
-= optlen
, cp
+= optlen
) {
1473 opt
= cp
[IPOPT_OPTVAL
];
1474 if (opt
== IPOPT_EOL
)
1476 if (opt
== IPOPT_NOP
)
1479 if (cnt
< IPOPT_OLEN
+ sizeof(*cp
)) {
1480 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1483 optlen
= cp
[IPOPT_OLEN
];
1484 if (optlen
< IPOPT_OLEN
+ sizeof(*cp
) || optlen
> cnt
) {
1485 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1495 * Source routing with record.
1496 * Find interface with current destination address.
1497 * If none on this machine then drop if strictly routed,
1498 * or do nothing if loosely routed.
1499 * Record interface address and bring up next address
1500 * component. If strictly routed make sure next
1501 * address is on directly accessible net.
1505 if (ipstealth
&& pass
> 0)
1507 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1508 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1511 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1512 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1515 ipaddr
.sin_addr
= ip
->ip_dst
;
1516 ia
= (struct in_ifaddr
*)
1517 ifa_ifwithaddr((struct sockaddr
*)&ipaddr
);
1519 if (opt
== IPOPT_SSRR
) {
1520 type
= ICMP_UNREACH
;
1521 code
= ICMP_UNREACH_SRCFAIL
;
1524 if (!ip_dosourceroute
)
1525 goto nosourcerouting
;
1527 * Loose routing, and not at next destination
1528 * yet; nothing to do except forward.
1532 off
--; /* 0 origin */
1533 if (off
> optlen
- (int)sizeof(struct in_addr
)) {
1535 * End of source route. Should be for us.
1537 if (!ip_acceptsourceroute
)
1538 goto nosourcerouting
;
1539 save_rte(cp
, ip
->ip_src
);
1544 if (!ip_dosourceroute
) {
1546 char buf
[sizeof "aaa.bbb.ccc.ddd"];
1549 * Acting as a router, so generate ICMP
1552 strcpy(buf
, inet_ntoa(ip
->ip_dst
));
1554 "attempted source route from %s to %s\n",
1555 inet_ntoa(ip
->ip_src
), buf
);
1556 type
= ICMP_UNREACH
;
1557 code
= ICMP_UNREACH_SRCFAIL
;
1561 * Not acting as a router,
1565 ipstat
.ips_cantforward
++;
1572 * locate outgoing interface
1574 memcpy(&ipaddr
.sin_addr
, cp
+ off
,
1575 sizeof ipaddr
.sin_addr
);
1577 if (opt
== IPOPT_SSRR
) {
1578 #define INA struct in_ifaddr *
1579 #define SA struct sockaddr *
1580 if ((ia
= (INA
)ifa_ifwithdstaddr((SA
)&ipaddr
))
1582 ia
= (INA
)ifa_ifwithnet((SA
)&ipaddr
);
1584 ia
= ip_rtaddr(ipaddr
.sin_addr
,
1585 &ipforward_rt
[mycpuid
]);
1587 type
= ICMP_UNREACH
;
1588 code
= ICMP_UNREACH_SRCFAIL
;
1591 ip
->ip_dst
= ipaddr
.sin_addr
;
1592 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1593 sizeof(struct in_addr
));
1594 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1596 * Let ip_intr's mcast routing check handle mcast pkts
1598 forward
= !IN_MULTICAST(ntohl(ip
->ip_dst
.s_addr
));
1602 if (ipstealth
&& pass
== 0)
1604 if (optlen
< IPOPT_OFFSET
+ sizeof(*cp
)) {
1605 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1608 if ((off
= cp
[IPOPT_OFFSET
]) < IPOPT_MINOFF
) {
1609 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1613 * If no space remains, ignore.
1615 off
--; /* 0 origin */
1616 if (off
> optlen
- (int)sizeof(struct in_addr
))
1618 memcpy(&ipaddr
.sin_addr
, &ip
->ip_dst
,
1619 sizeof ipaddr
.sin_addr
);
1621 * locate outgoing interface; if we're the destination,
1622 * use the incoming interface (should be same).
1624 if ((ia
= (INA
)ifa_ifwithaddr((SA
)&ipaddr
)) == NULL
&&
1625 (ia
= ip_rtaddr(ipaddr
.sin_addr
,
1626 &ipforward_rt
[mycpuid
]))
1628 type
= ICMP_UNREACH
;
1629 code
= ICMP_UNREACH_HOST
;
1632 memcpy(cp
+ off
, &IA_SIN(ia
)->sin_addr
,
1633 sizeof(struct in_addr
));
1634 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1638 if (ipstealth
&& pass
== 0)
1640 code
= cp
- (u_char
*)ip
;
1641 if (optlen
< 4 || optlen
> 40) {
1642 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1645 if ((off
= cp
[IPOPT_OFFSET
]) < 5) {
1646 code
= &cp
[IPOPT_OLEN
] - (u_char
*)ip
;
1649 if (off
> optlen
- (int)sizeof(int32_t)) {
1650 cp
[IPOPT_OFFSET
+ 1] += (1 << 4);
1651 if ((cp
[IPOPT_OFFSET
+ 1] & 0xf0) == 0) {
1652 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1657 off
--; /* 0 origin */
1658 sin
= (struct in_addr
*)(cp
+ off
);
1659 switch (cp
[IPOPT_OFFSET
+ 1] & 0x0f) {
1661 case IPOPT_TS_TSONLY
:
1664 case IPOPT_TS_TSANDADDR
:
1665 if (off
+ sizeof(n_time
) +
1666 sizeof(struct in_addr
) > optlen
) {
1667 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1670 ipaddr
.sin_addr
= dst
;
1671 ia
= (INA
)ifaof_ifpforaddr((SA
)&ipaddr
,
1675 memcpy(sin
, &IA_SIN(ia
)->sin_addr
,
1676 sizeof(struct in_addr
));
1677 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1678 off
+= sizeof(struct in_addr
);
1681 case IPOPT_TS_PRESPEC
:
1682 if (off
+ sizeof(n_time
) +
1683 sizeof(struct in_addr
) > optlen
) {
1684 code
= &cp
[IPOPT_OFFSET
] - (u_char
*)ip
;
1687 memcpy(&ipaddr
.sin_addr
, sin
,
1688 sizeof(struct in_addr
));
1689 if (ifa_ifwithaddr((SA
)&ipaddr
) == NULL
)
1691 cp
[IPOPT_OFFSET
] += sizeof(struct in_addr
);
1692 off
+= sizeof(struct in_addr
);
1696 code
= &cp
[IPOPT_OFFSET
+ 1] - (u_char
*)ip
;
1700 memcpy(cp
+ off
, &ntime
, sizeof(n_time
));
1701 cp
[IPOPT_OFFSET
] += sizeof(n_time
);
1704 if (forward
&& ipforwarding
) {
1705 ip_forward(m
, TRUE
, next_hop
);
1710 icmp_error(m
, type
, code
, 0, 0);
1711 ipstat
.ips_badoptions
++;
1716 * Given address of next destination (final or next hop),
1717 * return internet address info of interface to be used to get there.
1720 ip_rtaddr(struct in_addr dst
, struct route
*ro
)
1722 struct sockaddr_in
*sin
;
1724 sin
= (struct sockaddr_in
*)&ro
->ro_dst
;
1726 if (ro
->ro_rt
== NULL
|| dst
.s_addr
!= sin
->sin_addr
.s_addr
) {
1727 if (ro
->ro_rt
!= NULL
) {
1731 sin
->sin_family
= AF_INET
;
1732 sin
->sin_len
= sizeof *sin
;
1733 sin
->sin_addr
= dst
;
1734 rtalloc_ign(ro
, RTF_PRCLONING
);
1737 if (ro
->ro_rt
== NULL
)
1740 return (ifatoia(ro
->ro_rt
->rt_ifa
));
1744 * Save incoming source route for use in replies,
1745 * to be picked up later by ip_srcroute if the receiver is interested.
1748 save_rte(u_char
*option
, struct in_addr dst
)
1752 olen
= option
[IPOPT_OLEN
];
1755 kprintf("save_rte: olen %d\n", olen
);
1757 if (olen
> sizeof(ip_srcrt
) - (1 + sizeof(dst
)))
1759 bcopy(option
, ip_srcrt
.srcopt
, olen
);
1760 ip_nhops
= (olen
- IPOPT_OFFSET
- 1) / sizeof(struct in_addr
);
1765 * Retrieve incoming source route for use in replies,
1766 * in the same form used by setsockopt.
1767 * The first hop is placed before the options, will be removed later.
1772 struct in_addr
*p
, *q
;
1777 m
= m_get(MB_DONTWAIT
, MT_HEADER
);
1781 #define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt))
1783 /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */
1784 m
->m_len
= ip_nhops
* sizeof(struct in_addr
) + sizeof(struct in_addr
) +
1788 kprintf("ip_srcroute: nhops %d mlen %d", ip_nhops
, m
->m_len
);
1792 * First save first hop for return route
1794 p
= &ip_srcrt
.route
[ip_nhops
- 1];
1795 *(mtod(m
, struct in_addr
*)) = *p
--;
1798 kprintf(" hops %x", ntohl(mtod(m
, struct in_addr
*)->s_addr
));
1802 * Copy option fields and padding (nop) to mbuf.
1804 ip_srcrt
.nop
= IPOPT_NOP
;
1805 ip_srcrt
.srcopt
[IPOPT_OFFSET
] = IPOPT_MINOFF
;
1806 memcpy(mtod(m
, caddr_t
) + sizeof(struct in_addr
), &ip_srcrt
.nop
,
1808 q
= (struct in_addr
*)(mtod(m
, caddr_t
) +
1809 sizeof(struct in_addr
) + OPTSIZ
);
1812 * Record return path as an IP source route,
1813 * reversing the path (pointers are now aligned).
1815 while (p
>= ip_srcrt
.route
) {
1818 kprintf(" %x", ntohl(q
->s_addr
));
1823 * Last hop goes to final destination.
1828 kprintf(" %x\n", ntohl(q
->s_addr
));
1834 * Strip out IP options.
1837 ip_stripoptions(struct mbuf
*m
)
1840 struct ip
*ip
= mtod(m
, struct ip
*);
1844 optlen
= (IP_VHL_HL(ip
->ip_vhl
) << 2) - sizeof(struct ip
);
1845 opts
= (caddr_t
)(ip
+ 1);
1846 datalen
= m
->m_len
- (sizeof(struct ip
) + optlen
);
1847 bcopy(opts
+ optlen
, opts
, datalen
);
1849 if (m
->m_flags
& M_PKTHDR
)
1850 m
->m_pkthdr
.len
-= optlen
;
1851 ip
->ip_vhl
= IP_MAKE_VHL(IPVERSION
, sizeof(struct ip
) >> 2);
1854 u_char inetctlerrmap
[PRC_NCMDS
] = {
1856 0, EMSGSIZE
, EHOSTDOWN
, EHOSTUNREACH
,
1857 EHOSTUNREACH
, EHOSTUNREACH
, ECONNREFUSED
, ECONNREFUSED
,
1858 EMSGSIZE
, EHOSTUNREACH
, 0, 0,
1860 ENOPROTOOPT
, ECONNREFUSED
1864 * Forward a packet. If some error occurs return the sender
1865 * an icmp packet. Note we can't always generate a meaningful
1866 * icmp message because icmp doesn't have a large enough repertoire
1867 * of codes and types.
1869 * If not forwarding, just drop the packet. This could be confusing
1870 * if ipforwarding was zero but some routing protocol was advancing
1871 * us as a gateway to somewhere. However, we must let the routing
1872 * protocol deal with that.
1874 * The using_srcrt parameter indicates whether the packet is being forwarded
1875 * via a source route.
1878 ip_forward(struct mbuf
*m
, boolean_t using_srcrt
, struct sockaddr_in
*next_hop
)
1880 struct ip
*ip
= mtod(m
, struct ip
*);
1881 struct sockaddr_in
*ipforward_rtaddr
;
1883 int error
, type
= 0, code
= 0, destmtu
= 0;
1886 struct in_addr pkt_dst
;
1888 struct route
*cache_rt
= &ipforward_rt
[mycpuid
];
1892 * Cache the destination address of the packet; this may be
1893 * changed by use of 'ipfw fwd'.
1895 pkt_dst
= (next_hop
!= NULL
) ? next_hop
->sin_addr
: ip
->ip_dst
;
1899 kprintf("forward: src %x dst %x ttl %x\n",
1900 ip
->ip_src
.s_addr
, pkt_dst
.s_addr
, ip
->ip_ttl
);
1903 if (m
->m_flags
& (M_BCAST
| M_MCAST
) || !in_canforward(pkt_dst
)) {
1904 ipstat
.ips_cantforward
++;
1908 if (!ipstealth
&& ip
->ip_ttl
<= IPTTLDEC
) {
1909 icmp_error(m
, ICMP_TIMXCEED
, ICMP_TIMXCEED_INTRANS
, dest
, 0);
1913 ipforward_rtaddr
= (struct sockaddr_in
*) &cache_rt
->ro_dst
;
1914 if (cache_rt
->ro_rt
== NULL
||
1915 ipforward_rtaddr
->sin_addr
.s_addr
!= pkt_dst
.s_addr
) {
1916 if (cache_rt
->ro_rt
!= NULL
) {
1917 RTFREE(cache_rt
->ro_rt
);
1918 cache_rt
->ro_rt
= NULL
;
1920 ipforward_rtaddr
->sin_family
= AF_INET
;
1921 ipforward_rtaddr
->sin_len
= sizeof(struct sockaddr_in
);
1922 ipforward_rtaddr
->sin_addr
= pkt_dst
;
1923 rtalloc_ign(cache_rt
, RTF_PRCLONING
);
1924 if (cache_rt
->ro_rt
== NULL
) {
1925 icmp_error(m
, ICMP_UNREACH
, ICMP_UNREACH_HOST
, dest
, 0);
1929 rt
= cache_rt
->ro_rt
;
1932 * Save the IP header and at most 8 bytes of the payload,
1933 * in case we need to generate an ICMP message to the src.
1935 * XXX this can be optimized a lot by saving the data in a local
1936 * buffer on the stack (72 bytes at most), and only allocating the
1937 * mbuf if really necessary. The vast majority of the packets
1938 * are forwarded without having to send an ICMP back (either
1939 * because unnecessary, or because rate limited), so we are
1940 * really we are wasting a lot of work here.
1942 * We don't use m_copy() because it might return a reference
1943 * to a shared cluster. Both this function and ip_output()
1944 * assume exclusive access to the IP header in `m', so any
1945 * data in a cluster may change before we reach icmp_error().
1947 MGETHDR(mcopy
, MB_DONTWAIT
, m
->m_type
);
1948 if (mcopy
!= NULL
&& !m_dup_pkthdr(mcopy
, m
, MB_DONTWAIT
)) {
1950 * It's probably ok if the pkthdr dup fails (because
1951 * the deep copy of the tag chain failed), but for now
1952 * be conservative and just discard the copy since
1953 * code below may some day want the tags.
1958 if (mcopy
!= NULL
) {
1959 mcopy
->m_len
= imin((IP_VHL_HL(ip
->ip_vhl
) << 2) + 8,
1961 mcopy
->m_pkthdr
.len
= mcopy
->m_len
;
1962 m_copydata(m
, 0, mcopy
->m_len
, mtod(mcopy
, caddr_t
));
1966 ip
->ip_ttl
-= IPTTLDEC
;
1969 * If forwarding packet using same interface that it came in on,
1970 * perhaps should send a redirect to sender to shortcut a hop.
1971 * Only send redirect if source is sending directly to us,
1972 * and if packet was not source routed (or has any options).
1973 * Also, don't send redirect if forwarding using a default route
1974 * or a route modified by a redirect.
1976 if (rt
->rt_ifp
== m
->m_pkthdr
.rcvif
&&
1977 !(rt
->rt_flags
& (RTF_DYNAMIC
| RTF_MODIFIED
)) &&
1978 satosin(rt_key(rt
))->sin_addr
.s_addr
!= INADDR_ANY
&&
1979 ipsendredirects
&& !using_srcrt
&& next_hop
== NULL
) {
1980 u_long src
= ntohl(ip
->ip_src
.s_addr
);
1981 struct in_ifaddr
*rt_ifa
= (struct in_ifaddr
*)rt
->rt_ifa
;
1983 if (rt_ifa
!= NULL
&&
1984 (src
& rt_ifa
->ia_subnetmask
) == rt_ifa
->ia_subnet
) {
1985 if (rt
->rt_flags
& RTF_GATEWAY
)
1986 dest
= satosin(rt
->rt_gateway
)->sin_addr
.s_addr
;
1988 dest
= pkt_dst
.s_addr
;
1990 * Router requirements says to only send
1993 type
= ICMP_REDIRECT
;
1994 code
= ICMP_REDIRECT_HOST
;
1997 kprintf("redirect (%d) to %x\n", code
, dest
);
2002 if (next_hop
!= NULL
) {
2003 /* Pass IPFORWARD info if available */
2004 tag
.mh_type
= MT_TAG
;
2005 tag
.mh_flags
= PACKET_TAG_IPFORWARD
;
2006 tag
.mh_data
= (caddr_t
)next_hop
;
2008 m
= (struct mbuf
*)&tag
;
2011 error
= ip_output(m
, NULL
, cache_rt
, IP_FORWARDING
, NULL
,
2014 ipstat
.ips_forward
++;
2017 /* ipflow_create() will free mcopy */
2018 ipflow_create(cache_rt
, mcopy
);
2020 return; /* most common case */
2022 ipstat
.ips_redirectsent
++;
2025 ipstat
.ips_cantforward
++;
2032 * Send ICMP message.
2037 case 0: /* forwarded, but need redirect */
2038 /* type, code set above */
2041 case ENETUNREACH
: /* shouldn't happen, checked above */
2046 type
= ICMP_UNREACH
;
2047 code
= ICMP_UNREACH_HOST
;
2051 type
= ICMP_UNREACH
;
2052 code
= ICMP_UNREACH_NEEDFRAG
;
2055 * If the packet is routed over IPsec tunnel, tell the
2056 * originator the tunnel MTU.
2057 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2060 if (cache_rt
->ro_rt
!= NULL
) {
2061 struct secpolicy
*sp
= NULL
;
2066 sp
= ipsec4_getpolicybyaddr(mcopy
,
2072 destmtu
= cache_rt
->ro_rt
->rt_ifp
->if_mtu
;
2074 /* count IPsec header size */
2075 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2080 * find the correct route for outer IPv4
2081 * header, compute tunnel MTU.
2084 if (sp
->req
!= NULL
&& sp
->req
->sav
!= NULL
&&
2085 sp
->req
->sav
->sah
!= NULL
) {
2086 ro
= &sp
->req
->sav
->sah
->sa_route
;
2087 if (ro
->ro_rt
!= NULL
&&
2088 ro
->ro_rt
->rt_ifp
!= NULL
) {
2090 ro
->ro_rt
->rt_ifp
->if_mtu
;
2091 destmtu
-= ipsechdr
;
2100 * If the packet is routed over IPsec tunnel, tell the
2101 * originator the tunnel MTU.
2102 * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz
2105 if (cache_rt
->ro_rt
!= NULL
) {
2106 struct secpolicy
*sp
= NULL
;
2111 sp
= ipsec_getpolicybyaddr(mcopy
,
2117 destmtu
= cache_rt
->ro_rt
->rt_ifp
->if_mtu
;
2119 /* count IPsec header size */
2120 ipsechdr
= ipsec4_hdrsiz(mcopy
,
2125 * find the correct route for outer IPv4
2126 * header, compute tunnel MTU.
2129 if (sp
->req
!= NULL
&&
2130 sp
->req
->sav
!= NULL
&&
2131 sp
->req
->sav
->sah
!= NULL
) {
2132 ro
= &sp
->req
->sav
->sah
->sa_route
;
2133 if (ro
->ro_rt
!= NULL
&&
2134 ro
->ro_rt
->rt_ifp
!= NULL
) {
2136 ro
->ro_rt
->rt_ifp
->if_mtu
;
2137 destmtu
-= ipsechdr
;
2144 #else /* !IPSEC && !FAST_IPSEC */
2145 if (cache_rt
->ro_rt
!= NULL
)
2146 destmtu
= cache_rt
->ro_rt
->rt_ifp
->if_mtu
;
2148 ipstat
.ips_cantfrag
++;
2153 * A router should not generate ICMP_SOURCEQUENCH as
2154 * required in RFC1812 Requirements for IP Version 4 Routers.
2155 * Source quench could be a big problem under DoS attacks,
2156 * or if the underlying interface is rate-limited.
2157 * Those who need source quench packets may re-enable them
2158 * via the net.inet.ip.sendsourcequench sysctl.
2160 if (!ip_sendsourcequench
) {
2164 type
= ICMP_SOURCEQUENCH
;
2169 case EACCES
: /* ipfw denied packet */
2173 icmp_error(mcopy
, type
, code
, dest
, destmtu
);
2177 ip_savecontrol(struct inpcb
*inp
, struct mbuf
**mp
, struct ip
*ip
,
2180 if (inp
->inp_socket
->so_options
& SO_TIMESTAMP
) {
2184 *mp
= sbcreatecontrol((caddr_t
) &tv
, sizeof(tv
),
2185 SCM_TIMESTAMP
, SOL_SOCKET
);
2187 mp
= &(*mp
)->m_next
;
2189 if (inp
->inp_flags
& INP_RECVDSTADDR
) {
2190 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_dst
,
2191 sizeof(struct in_addr
), IP_RECVDSTADDR
, IPPROTO_IP
);
2193 mp
= &(*mp
)->m_next
;
2195 if (inp
->inp_flags
& INP_RECVTTL
) {
2196 *mp
= sbcreatecontrol((caddr_t
) &ip
->ip_ttl
,
2197 sizeof(u_char
), IP_RECVTTL
, IPPROTO_IP
);
2199 mp
= &(*mp
)->m_next
;
2203 * Moving these out of udp_input() made them even more broken
2204 * than they already were.
2206 /* options were tossed already */
2207 if (inp
->inp_flags
& INP_RECVOPTS
) {
2208 *mp
= sbcreatecontrol((caddr_t
) opts_deleted_above
,
2209 sizeof(struct in_addr
), IP_RECVOPTS
, IPPROTO_IP
);
2211 mp
= &(*mp
)->m_next
;
2213 /* ip_srcroute doesn't do what we want here, need to fix */
2214 if (inp
->inp_flags
& INP_RECVRETOPTS
) {
2215 *mp
= sbcreatecontrol((caddr_t
) ip_srcroute(),
2216 sizeof(struct in_addr
), IP_RECVRETOPTS
, IPPROTO_IP
);
2218 mp
= &(*mp
)->m_next
;
2221 if (inp
->inp_flags
& INP_RECVIF
) {
2224 struct sockaddr_dl sdl
;
2227 struct sockaddr_dl
*sdp
;
2228 struct sockaddr_dl
*sdl2
= &sdlbuf
.sdl
;
2230 if (((ifp
= m
->m_pkthdr
.rcvif
)) &&
2231 ((ifp
->if_index
!= 0) && (ifp
->if_index
<= if_index
))) {
2232 sdp
= IF_LLSOCKADDR(ifp
);
2234 * Change our mind and don't try copy.
2236 if ((sdp
->sdl_family
!= AF_LINK
) ||
2237 (sdp
->sdl_len
> sizeof(sdlbuf
))) {
2240 bcopy(sdp
, sdl2
, sdp
->sdl_len
);
2244 offsetof(struct sockaddr_dl
, sdl_data
[0]);
2245 sdl2
->sdl_family
= AF_LINK
;
2246 sdl2
->sdl_index
= 0;
2247 sdl2
->sdl_nlen
= sdl2
->sdl_alen
= sdl2
->sdl_slen
= 0;
2249 *mp
= sbcreatecontrol((caddr_t
) sdl2
, sdl2
->sdl_len
,
2250 IP_RECVIF
, IPPROTO_IP
);
2252 mp
= &(*mp
)->m_next
;
2257 * XXX these routines are called from the upper part of the kernel.
2259 * They could also be moved to ip_mroute.c, since all the RSVP
2260 * handling is done there already.
2263 ip_rsvp_init(struct socket
*so
)
2265 if (so
->so_type
!= SOCK_RAW
||
2266 so
->so_proto
->pr_protocol
!= IPPROTO_RSVP
)
2269 if (ip_rsvpd
!= NULL
)
2274 * This may seem silly, but we need to be sure we don't over-increment
2275 * the RSVP counter, in case something slips up.
2290 * This may seem silly, but we need to be sure we don't over-decrement
2291 * the RSVP counter, in case something slips up.
2301 rsvp_input(struct mbuf
*m
, ...) /* XXX must fixup manually */
2307 off
= __va_arg(ap
, int);
2308 proto
= __va_arg(ap
, int);
2311 if (rsvp_input_p
) { /* call the real one if loaded */
2312 rsvp_input_p(m
, off
, proto
);
2316 /* Can still get packets with rsvp_on = 0 if there is a local member
2317 * of the group to which the RSVP packet is addressed. But in this
2318 * case we want to throw the packet away.
2326 if (ip_rsvpd
!= NULL
) {
2327 rip_input(m
, off
, proto
);
2330 /* Drop the packet */