2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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14 * may be used to endorse or promote products derived from this software
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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29 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_bootp.h"
37 #include "opt_ipstealth.h"
38 #include "opt_ipsec.h"
39 #include "opt_kdtrace.h"
40 #include "opt_route.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
45 #include <sys/malloc.h>
46 #include <sys/domain.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
50 #include <sys/kernel.h>
52 #include <sys/rwlock.h>
54 #include <sys/syslog.h>
55 #include <sys/sysctl.h>
59 #include <net/if_types.h>
60 #include <net/if_var.h>
61 #include <net/if_dl.h>
62 #include <net/route.h>
63 #include <net/netisr.h>
66 #include <netinet/in.h>
67 #include <netinet/in_kdtrace.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/in_var.h>
70 #include <netinet/ip.h>
71 #include <netinet/in_pcb.h>
72 #include <netinet/ip_var.h>
73 #include <netinet/ip_fw.h>
74 #include <netinet/ip_icmp.h>
75 #include <netinet/ip_options.h>
76 #include <machine/in_cksum.h>
77 #include <netinet/ip_carp.h>
79 #include <netinet/ip_ipsec.h>
80 #include <netipsec/ipsec.h>
81 #include <netipsec/key.h>
84 #include <sys/socketvar.h>
86 #include <security/mac/mac_framework.h>
89 CTASSERT(sizeof(struct ip) == 20);
92 struct rwlock in_ifaddr_lock;
93 RW_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock");
95 VNET_DEFINE(int, rsvp_on);
97 VNET_DEFINE(int, ipforwarding);
98 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW,
99 &VNET_NAME(ipforwarding), 0,
100 "Enable IP forwarding between interfaces");
102 static VNET_DEFINE(int, ipsendredirects) = 1; /* XXX */
103 #define V_ipsendredirects VNET(ipsendredirects)
104 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
105 &VNET_NAME(ipsendredirects), 0,
106 "Enable sending IP redirects");
108 static VNET_DEFINE(int, ip_keepfaith);
109 #define V_ip_keepfaith VNET(ip_keepfaith)
110 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
111 &VNET_NAME(ip_keepfaith), 0,
112 "Enable packet capture for FAITH IPv4->IPv6 translater daemon");
114 static VNET_DEFINE(int, ip_sendsourcequench);
115 #define V_ip_sendsourcequench VNET(ip_sendsourcequench)
116 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
117 &VNET_NAME(ip_sendsourcequench), 0,
118 "Enable the transmission of source quench packets");
120 VNET_DEFINE(int, ip_do_randomid);
121 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
122 &VNET_NAME(ip_do_randomid), 0,
123 "Assign random ip_id values");
126 * XXX - Setting ip_checkinterface mostly implements the receive side of
127 * the Strong ES model described in RFC 1122, but since the routing table
128 * and transmit implementation do not implement the Strong ES model,
129 * setting this to 1 results in an odd hybrid.
131 * XXX - ip_checkinterface currently must be disabled if you use ipnat
132 * to translate the destination address to another local interface.
134 * XXX - ip_checkinterface must be disabled if you add IP aliases
135 * to the loopback interface instead of the interface where the
136 * packets for those addresses are received.
138 static VNET_DEFINE(int, ip_checkinterface);
139 #define V_ip_checkinterface VNET(ip_checkinterface)
140 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
141 &VNET_NAME(ip_checkinterface), 0,
142 "Verify packet arrives on correct interface");
144 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */
146 static struct netisr_handler ip_nh = {
148 .nh_handler = ip_input,
149 .nh_proto = NETISR_IP,
150 .nh_policy = NETISR_POLICY_FLOW,
153 extern struct domain inetdomain;
154 extern struct protosw inetsw[];
155 u_char ip_protox[IPPROTO_MAX];
156 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
157 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
158 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
160 static VNET_DEFINE(uma_zone_t, ipq_zone);
161 static VNET_DEFINE(TAILQ_HEAD(ipqhead, ipq), ipq[IPREASS_NHASH]);
162 static struct mtx ipqlock;
164 #define V_ipq_zone VNET(ipq_zone)
165 #define V_ipq VNET(ipq)
167 #define IPQ_LOCK() mtx_lock(&ipqlock)
168 #define IPQ_UNLOCK() mtx_unlock(&ipqlock)
169 #define IPQ_LOCK_INIT() mtx_init(&ipqlock, "ipqlock", NULL, MTX_DEF)
170 #define IPQ_LOCK_ASSERT() mtx_assert(&ipqlock, MA_OWNED)
172 static void maxnipq_update(void);
173 static void ipq_zone_change(void *);
174 static void ip_drain_locked(void);
176 static VNET_DEFINE(int, maxnipq); /* Administrative limit on # reass queues. */
177 static VNET_DEFINE(int, nipq); /* Total # of reass queues */
178 #define V_maxnipq VNET(maxnipq)
179 #define V_nipq VNET(nipq)
180 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD,
182 "Current number of IPv4 fragment reassembly queue entries");
184 static VNET_DEFINE(int, maxfragsperpacket);
185 #define V_maxfragsperpacket VNET(maxfragsperpacket)
186 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
187 &VNET_NAME(maxfragsperpacket), 0,
188 "Maximum number of IPv4 fragments allowed per packet");
191 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
192 &ip_mtu, 0, "Default MTU");
196 VNET_DEFINE(int, ipstealth);
197 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW,
198 &VNET_NAME(ipstealth), 0,
199 "IP stealth mode, no TTL decrementation on forwarding");
202 static void ip_freef(struct ipqhead *, struct ipq *);
205 * IP statistics are stored in the "array" of counter(9)s.
207 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat);
208 VNET_PCPUSTAT_SYSINIT(ipstat);
209 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat,
210 "IP statistics (struct ipstat, netinet/ip_var.h)");
213 VNET_PCPUSTAT_SYSUNINIT(ipstat);
217 * Kernel module interface for updating ipstat. The argument is an index
218 * into ipstat treated as an array.
221 kmod_ipstat_inc(int statnum)
224 counter_u64_add(VNET(ipstat)[statnum], 1);
228 kmod_ipstat_dec(int statnum)
231 counter_u64_add(VNET(ipstat)[statnum], -1);
235 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
239 netisr_getqlimit(&ip_nh, &qlimit);
240 error = sysctl_handle_int(oidp, &qlimit, 0, req);
241 if (error || !req->newptr)
245 return (netisr_setqlimit(&ip_nh, qlimit));
247 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
248 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I",
249 "Maximum size of the IP input queue");
252 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
254 u_int64_t qdrops_long;
257 netisr_getqdrops(&ip_nh, &qdrops_long);
258 qdrops = qdrops_long;
259 error = sysctl_handle_int(oidp, &qdrops, 0, req);
260 if (error || !req->newptr)
264 netisr_clearqdrops(&ip_nh);
268 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
269 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I",
270 "Number of packets dropped from the IP input queue");
273 * IP initialization: fill in IP protocol switch table.
274 * All protocols not implemented in kernel go to raw IP protocol handler.
282 V_ip_id = time_second & 0xffff;
284 TAILQ_INIT(&V_in_ifaddrhead);
285 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
287 /* Initialize IP reassembly queue. */
288 for (i = 0; i < IPREASS_NHASH; i++)
289 TAILQ_INIT(&V_ipq[i]);
290 V_maxnipq = nmbclusters / 32;
291 V_maxfragsperpacket = 16;
292 V_ipq_zone = uma_zcreate("ipq", sizeof(struct ipq), NULL, NULL, NULL,
293 NULL, UMA_ALIGN_PTR, 0);
296 /* Initialize packet filter hooks. */
297 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF;
298 V_inet_pfil_hook.ph_af = AF_INET;
299 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0)
300 printf("%s: WARNING: unable to register pfil hook, "
301 "error %d\n", __func__, i);
303 /* Skip initialization of globals for non-default instances. */
304 if (!IS_DEFAULT_VNET(curvnet))
307 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
309 panic("ip_init: PF_INET not found");
311 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
312 for (i = 0; i < IPPROTO_MAX; i++)
313 ip_protox[i] = pr - inetsw;
315 * Cycle through IP protocols and put them into the appropriate place
318 for (pr = inetdomain.dom_protosw;
319 pr < inetdomain.dom_protoswNPROTOSW; pr++)
320 if (pr->pr_domain->dom_family == PF_INET &&
321 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
322 /* Be careful to only index valid IP protocols. */
323 if (pr->pr_protocol < IPPROTO_MAX)
324 ip_protox[pr->pr_protocol] = pr - inetsw;
327 EVENTHANDLER_REGISTER(nmbclusters_change, ipq_zone_change,
328 NULL, EVENTHANDLER_PRI_ANY);
330 /* Initialize various other remaining things. */
332 netisr_register(&ip_nh);
341 if ((i = pfil_head_unregister(&V_inet_pfil_hook)) != 0)
342 printf("%s: WARNING: unable to unregister pfil hook, "
343 "error %d\n", __func__, i);
345 /* Cleanup in_ifaddr hash table; should be empty. */
346 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
352 uma_zdestroy(V_ipq_zone);
357 * Ip input routine. Checksum and byte swap header. If fragmented
358 * try to reassemble. Process options. Pass to next level.
361 ip_input(struct mbuf *m)
363 struct ip *ip = NULL;
364 struct in_ifaddr *ia = NULL;
367 int checkif, hlen = 0;
368 uint16_t sum, ip_len;
369 int dchg = 0; /* dest changed after fw */
370 struct in_addr odst; /* original dst address */
374 if (m->m_flags & M_FASTFWD_OURS) {
375 m->m_flags &= ~M_FASTFWD_OURS;
376 /* Set up some basics that will be used later. */
377 ip = mtod(m, struct ip *);
378 hlen = ip->ip_hl << 2;
379 ip_len = ntohs(ip->ip_len);
383 IPSTAT_INC(ips_total);
385 if (m->m_pkthdr.len < sizeof(struct ip))
388 if (m->m_len < sizeof (struct ip) &&
389 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
390 IPSTAT_INC(ips_toosmall);
393 ip = mtod(m, struct ip *);
395 if (ip->ip_v != IPVERSION) {
396 IPSTAT_INC(ips_badvers);
400 hlen = ip->ip_hl << 2;
401 if (hlen < sizeof(struct ip)) { /* minimum header length */
402 IPSTAT_INC(ips_badhlen);
405 if (hlen > m->m_len) {
406 if ((m = m_pullup(m, hlen)) == NULL) {
407 IPSTAT_INC(ips_badhlen);
410 ip = mtod(m, struct ip *);
413 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
415 /* 127/8 must not appear on wire - RFC1122 */
416 ifp = m->m_pkthdr.rcvif;
417 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
418 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
419 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
420 IPSTAT_INC(ips_badaddr);
425 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
426 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
428 if (hlen == sizeof(struct ip)) {
429 sum = in_cksum_hdr(ip);
431 sum = in_cksum(m, hlen);
435 IPSTAT_INC(ips_badsum);
440 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
441 /* packet is dropped by traffic conditioner */
445 ip_len = ntohs(ip->ip_len);
447 IPSTAT_INC(ips_badlen);
452 * Check that the amount of data in the buffers
453 * is as at least much as the IP header would have us expect.
454 * Trim mbufs if longer than we expect.
455 * Drop packet if shorter than we expect.
457 if (m->m_pkthdr.len < ip_len) {
459 IPSTAT_INC(ips_tooshort);
462 if (m->m_pkthdr.len > ip_len) {
463 if (m->m_len == m->m_pkthdr.len) {
465 m->m_pkthdr.len = ip_len;
467 m_adj(m, ip_len - m->m_pkthdr.len);
469 /* Try to forward the packet, but if we fail continue */
471 /* For now we do not handle IPSEC in tryforward. */
472 if (!key_havesp(IPSEC_DIR_INBOUND) && !key_havesp(IPSEC_DIR_OUTBOUND) &&
473 (V_ipforwarding == 1))
474 if (ip_tryforward(m) == NULL)
477 * Bypass packet filtering for packets previously handled by IPsec.
479 if (ip_ipsec_filtertunnel(m))
482 if (V_ipforwarding == 1)
483 if (ip_tryforward(m) == NULL)
488 * Run through list of hooks for input packets.
490 * NB: Beware of the destination address changing (e.g.
491 * by NAT rewriting). When this happens, tell
492 * ip_forward to do the right thing.
495 /* Jump over all PFIL processing if hooks are not active. */
496 if (!PFIL_HOOKED(&V_inet_pfil_hook))
500 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0)
502 if (m == NULL) /* consumed by filter */
505 ip = mtod(m, struct ip *);
506 dchg = (odst.s_addr != ip->ip_dst.s_addr);
507 ifp = m->m_pkthdr.rcvif;
509 if (m->m_flags & M_FASTFWD_OURS) {
510 m->m_flags &= ~M_FASTFWD_OURS;
513 if (m->m_flags & M_IP_NEXTHOP) {
514 dchg = (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL);
517 * Directly ship the packet on. This allows
518 * forwarding packets originally destined to us
519 * to some other directly connected host.
528 * Process options and, if not destined for us,
529 * ship it on. ip_dooptions returns 1 when an
530 * error was detected (causing an icmp message
531 * to be sent and the original packet to be freed).
533 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
536 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
537 * matter if it is destined to another node, or whether it is
538 * a multicast one, RSVP wants it! and prevents it from being forwarded
539 * anywhere else. Also checks if the rsvp daemon is running before
540 * grabbing the packet.
542 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
546 * Check our list of addresses, to see if the packet is for us.
547 * If we don't have any addresses, assume any unicast packet
548 * we receive might be for us (and let the upper layers deal
551 if (TAILQ_EMPTY(&V_in_ifaddrhead) &&
552 (m->m_flags & (M_MCAST|M_BCAST)) == 0)
556 * Enable a consistency check between the destination address
557 * and the arrival interface for a unicast packet (the RFC 1122
558 * strong ES model) if IP forwarding is disabled and the packet
559 * is not locally generated and the packet is not subject to
562 * XXX - Checking also should be disabled if the destination
563 * address is ipnat'ed to a different interface.
565 * XXX - Checking is incompatible with IP aliases added
566 * to the loopback interface instead of the interface where
567 * the packets are received.
569 * XXX - This is the case for carp vhost IPs as well so we
570 * insert a workaround. If the packet got here, we already
571 * checked with carp_iamatch() and carp_forus().
573 checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
574 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
575 ifp->if_carp == NULL && (dchg == 0);
578 * Check for exact addresses in the hash bucket.
580 /* IN_IFADDR_RLOCK(); */
581 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
583 * If the address matches, verify that the packet
584 * arrived via the correct interface if checking is
587 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
588 (!checkif || ia->ia_ifp == ifp)) {
589 ifa_ref(&ia->ia_ifa);
590 /* IN_IFADDR_RUNLOCK(); */
594 /* IN_IFADDR_RUNLOCK(); */
597 * Check for broadcast addresses.
599 * Only accept broadcast packets that arrive via the matching
600 * interface. Reception of forwarded directed broadcasts would
601 * be handled via ip_forward() and ether_output() with the loopback
602 * into the stack for SIMPLEX interfaces handled by ether_output().
604 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
606 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
607 if (ifa->ifa_addr->sa_family != AF_INET)
610 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
613 IF_ADDR_RUNLOCK(ifp);
617 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
619 IF_ADDR_RUNLOCK(ifp);
624 IF_ADDR_RUNLOCK(ifp);
627 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
628 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
629 IPSTAT_INC(ips_cantforward);
633 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
636 * If we are acting as a multicast router, all
637 * incoming multicast packets are passed to the
638 * kernel-level multicast forwarding function.
639 * The packet is returned (relatively) intact; if
640 * ip_mforward() returns a non-zero value, the packet
641 * must be discarded, else it may be accepted below.
643 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
644 IPSTAT_INC(ips_cantforward);
650 * The process-level routing daemon needs to receive
651 * all multicast IGMP packets, whether or not this
652 * host belongs to their destination groups.
654 if (ip->ip_p == IPPROTO_IGMP)
656 IPSTAT_INC(ips_forward);
659 * Assume the packet is for us, to avoid prematurely taking
660 * a lock on the in_multi hash. Protocols must perform
661 * their own filtering and update statistics accordingly.
665 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
667 if (ip->ip_dst.s_addr == INADDR_ANY)
671 * FAITH(Firewall Aided Internet Translator)
673 if (ifp && ifp->if_type == IFT_FAITH) {
674 if (V_ip_keepfaith) {
675 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
683 * Not for us; forward if possible and desirable.
685 if (V_ipforwarding == 0) {
686 IPSTAT_INC(ips_cantforward);
700 * IPSTEALTH: Process non-routing options only
701 * if the packet is destined for us.
703 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) {
705 ifa_free(&ia->ia_ifa);
708 #endif /* IPSTEALTH */
710 /* Count the packet in the ip address stats */
712 ia->ia_ifa.if_ipackets++;
713 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
714 ifa_free(&ia->ia_ifa);
718 * Attempt reassembly; if it succeeds, proceed.
719 * ip_reass() will return a different mbuf.
721 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
722 /* XXXGL: shouldn't we save & set m_flags? */
726 ip = mtod(m, struct ip *);
727 /* Get the header length of the reassembled packet */
728 hlen = ip->ip_hl << 2;
733 * enforce IPsec policy checking if we are seeing last header.
734 * note that we do not visit this with protocols with pcb layer
735 * code - like udp/tcp/raw ip.
737 if (ip_ipsec_input(m))
742 * Switch out to protocol's input routine.
744 IPSTAT_INC(ips_delivered);
746 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
753 * After maxnipq has been updated, propagate the change to UMA. The UMA zone
754 * max has slightly different semantics than the sysctl, for historical
762 * -1 for unlimited allocation.
765 uma_zone_set_max(V_ipq_zone, 0);
767 * Positive number for specific bound.
770 uma_zone_set_max(V_ipq_zone, V_maxnipq);
772 * Zero specifies no further fragment queue allocation -- set the
773 * bound very low, but rely on implementation elsewhere to actually
774 * prevent allocation and reclaim current queues.
777 uma_zone_set_max(V_ipq_zone, 1);
781 ipq_zone_change(void *tag)
784 if (V_maxnipq > 0 && V_maxnipq < (nmbclusters / 32)) {
785 V_maxnipq = nmbclusters / 32;
791 sysctl_maxnipq(SYSCTL_HANDLER_ARGS)
796 error = sysctl_handle_int(oidp, &i, 0, req);
797 if (error || !req->newptr)
801 * XXXRW: Might be a good idea to sanity check the argument and place
802 * an extreme upper bound.
811 SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragpackets, CTLTYPE_INT|CTLFLAG_RW,
812 NULL, 0, sysctl_maxnipq, "I",
813 "Maximum number of IPv4 fragment reassembly queue entries");
815 #define M_IP_FRAG M_PROTO9
818 * Take incoming datagram fragment and try to reassemble it into
819 * whole datagram. If the argument is the first fragment or one
820 * in between the function will return NULL and store the mbuf
821 * in the fragment chain. If the argument is the last fragment
822 * the packet will be reassembled and the pointer to the new
823 * mbuf returned for further processing. Only m_tags attached
824 * to the first packet/fragment are preserved.
825 * The IP header is *NOT* adjusted out of iplen.
828 ip_reass(struct mbuf *m)
831 struct mbuf *p, *q, *nq, *t;
832 struct ipq *fp = NULL;
833 struct ipqhead *head;
838 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
839 if (V_maxnipq == 0 || V_maxfragsperpacket == 0) {
840 IPSTAT_INC(ips_fragments);
841 IPSTAT_INC(ips_fragdropped);
846 ip = mtod(m, struct ip *);
847 hlen = ip->ip_hl << 2;
849 hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
854 * Look for queue of fragments
857 TAILQ_FOREACH(fp, head, ipq_list)
858 if (ip->ip_id == fp->ipq_id &&
859 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
860 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
862 mac_ipq_match(m, fp) &&
864 ip->ip_p == fp->ipq_p)
870 * Attempt to trim the number of allocated fragment queues if it
871 * exceeds the administrative limit.
873 if ((V_nipq > V_maxnipq) && (V_maxnipq > 0)) {
875 * drop something from the tail of the current queue
876 * before proceeding further
878 struct ipq *q = TAILQ_LAST(head, ipqhead);
879 if (q == NULL) { /* gak */
880 for (i = 0; i < IPREASS_NHASH; i++) {
881 struct ipq *r = TAILQ_LAST(&V_ipq[i], ipqhead);
883 IPSTAT_ADD(ips_fragtimeout,
885 ip_freef(&V_ipq[i], r);
890 IPSTAT_ADD(ips_fragtimeout, q->ipq_nfrags);
897 * Adjust ip_len to not reflect header,
898 * convert offset of this to bytes.
900 ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
901 if (ip->ip_off & htons(IP_MF)) {
903 * Make sure that fragments have a data length
904 * that's a non-zero multiple of 8 bytes.
906 if (ip->ip_len == htons(0) || (ntohs(ip->ip_len) & 0x7) != 0) {
907 IPSTAT_INC(ips_toosmall); /* XXX */
910 m->m_flags |= M_IP_FRAG;
912 m->m_flags &= ~M_IP_FRAG;
913 ip->ip_off = htons(ntohs(ip->ip_off) << 3);
916 * Attempt reassembly; if it succeeds, proceed.
917 * ip_reass() will return a different mbuf.
919 IPSTAT_INC(ips_fragments);
920 m->m_pkthdr.PH_loc.ptr = ip;
922 /* Previous ip_reass() started here. */
924 * Presence of header sizes in mbufs
925 * would confuse code below.
931 * If first fragment to arrive, create a reassembly queue.
934 fp = uma_zalloc(V_ipq_zone, M_NOWAIT);
938 if (mac_ipq_init(fp, M_NOWAIT) != 0) {
939 uma_zfree(V_ipq_zone, fp);
943 mac_ipq_create(m, fp);
945 TAILQ_INSERT_HEAD(head, fp, ipq_list);
948 fp->ipq_ttl = IPFRAGTTL;
949 fp->ipq_p = ip->ip_p;
950 fp->ipq_id = ip->ip_id;
951 fp->ipq_src = ip->ip_src;
952 fp->ipq_dst = ip->ip_dst;
959 mac_ipq_update(m, fp);
963 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.PH_loc.ptr))
966 * Handle ECN by comparing this segment with the first one;
967 * if CE is set, do not lose CE.
968 * drop if CE and not-ECT are mixed for the same packet.
970 ecn = ip->ip_tos & IPTOS_ECN_MASK;
971 ecn0 = GETIP(fp->ipq_frags)->ip_tos & IPTOS_ECN_MASK;
972 if (ecn == IPTOS_ECN_CE) {
973 if (ecn0 == IPTOS_ECN_NOTECT)
975 if (ecn0 != IPTOS_ECN_CE)
976 GETIP(fp->ipq_frags)->ip_tos |= IPTOS_ECN_CE;
978 if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT)
982 * Find a segment which begins after this one does.
984 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
985 if (ntohs(GETIP(q)->ip_off) > ntohs(ip->ip_off))
989 * If there is a preceding segment, it may provide some of
990 * our data already. If so, drop the data from the incoming
991 * segment. If it provides all of our data, drop us, otherwise
992 * stick new segment in the proper place.
994 * If some of the data is dropped from the preceding
995 * segment, then it's checksum is invalidated.
998 i = ntohs(GETIP(p)->ip_off) + ntohs(GETIP(p)->ip_len) -
1001 if (i >= ntohs(ip->ip_len))
1004 m->m_pkthdr.csum_flags = 0;
1005 ip->ip_off = htons(ntohs(ip->ip_off) + i);
1006 ip->ip_len = htons(ntohs(ip->ip_len) - i);
1008 m->m_nextpkt = p->m_nextpkt;
1011 m->m_nextpkt = fp->ipq_frags;
1016 * While we overlap succeeding segments trim them or,
1017 * if they are completely covered, dequeue them.
1019 for (; q != NULL && ntohs(ip->ip_off) + ntohs(ip->ip_len) >
1020 ntohs(GETIP(q)->ip_off); q = nq) {
1021 i = (ntohs(ip->ip_off) + ntohs(ip->ip_len)) -
1022 ntohs(GETIP(q)->ip_off);
1023 if (i < ntohs(GETIP(q)->ip_len)) {
1024 GETIP(q)->ip_len = htons(ntohs(GETIP(q)->ip_len) - i);
1025 GETIP(q)->ip_off = htons(ntohs(GETIP(q)->ip_off) + i);
1027 q->m_pkthdr.csum_flags = 0;
1032 IPSTAT_INC(ips_fragdropped);
1038 * Check for complete reassembly and perform frag per packet
1041 * Frag limiting is performed here so that the nth frag has
1042 * a chance to complete the packet before we drop the packet.
1043 * As a result, n+1 frags are actually allowed per packet, but
1044 * only n will ever be stored. (n = maxfragsperpacket.)
1048 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1049 if (ntohs(GETIP(q)->ip_off) != next) {
1050 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1051 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1056 next += ntohs(GETIP(q)->ip_len);
1058 /* Make sure the last packet didn't have the IP_MF flag */
1059 if (p->m_flags & M_IP_FRAG) {
1060 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1061 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1068 * Reassembly is complete. Make sure the packet is a sane size.
1072 if (next + (ip->ip_hl << 2) > IP_MAXPACKET) {
1073 IPSTAT_INC(ips_toolong);
1074 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1080 * Concatenate fragments.
1087 q->m_nextpkt = NULL;
1088 for (q = nq; q != NULL; q = nq) {
1090 q->m_nextpkt = NULL;
1091 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1092 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1096 * In order to do checksumming faster we do 'end-around carry' here
1097 * (and not in for{} loop), though it implies we are not going to
1098 * reassemble more than 64k fragments.
1100 while (m->m_pkthdr.csum_data & 0xffff0000)
1101 m->m_pkthdr.csum_data = (m->m_pkthdr.csum_data & 0xffff) +
1102 (m->m_pkthdr.csum_data >> 16);
1104 mac_ipq_reassemble(fp, m);
1105 mac_ipq_destroy(fp);
1109 * Create header for new ip packet by modifying header of first
1110 * packet; dequeue and discard fragment reassembly header.
1111 * Make header visible.
1113 ip->ip_len = htons((ip->ip_hl << 2) + next);
1114 ip->ip_src = fp->ipq_src;
1115 ip->ip_dst = fp->ipq_dst;
1116 TAILQ_REMOVE(head, fp, ipq_list);
1118 uma_zfree(V_ipq_zone, fp);
1119 m->m_len += (ip->ip_hl << 2);
1120 m->m_data -= (ip->ip_hl << 2);
1121 /* some debugging cruft by sklower, below, will go away soon */
1122 if (m->m_flags & M_PKTHDR) /* XXX this should be done elsewhere */
1124 IPSTAT_INC(ips_reassembled);
1129 IPSTAT_INC(ips_fragdropped);
1141 * Free a fragment reassembly header and all
1142 * associated datagrams.
1145 ip_freef(struct ipqhead *fhp, struct ipq *fp)
1151 while (fp->ipq_frags) {
1153 fp->ipq_frags = q->m_nextpkt;
1156 TAILQ_REMOVE(fhp, fp, ipq_list);
1157 uma_zfree(V_ipq_zone, fp);
1162 * IP timer processing;
1163 * if a timer expires on a reassembly
1164 * queue, discard it.
1169 VNET_ITERATOR_DECL(vnet_iter);
1173 VNET_LIST_RLOCK_NOSLEEP();
1175 VNET_FOREACH(vnet_iter) {
1176 CURVNET_SET(vnet_iter);
1177 for (i = 0; i < IPREASS_NHASH; i++) {
1178 for(fp = TAILQ_FIRST(&V_ipq[i]); fp;) {
1182 fp = TAILQ_NEXT(fp, ipq_list);
1183 if(--fpp->ipq_ttl == 0) {
1184 IPSTAT_ADD(ips_fragtimeout,
1186 ip_freef(&V_ipq[i], fpp);
1191 * If we are over the maximum number of fragments
1192 * (due to the limit being lowered), drain off
1193 * enough to get down to the new limit.
1195 if (V_maxnipq >= 0 && V_nipq > V_maxnipq) {
1196 for (i = 0; i < IPREASS_NHASH; i++) {
1197 while (V_nipq > V_maxnipq &&
1198 !TAILQ_EMPTY(&V_ipq[i])) {
1199 IPSTAT_ADD(ips_fragdropped,
1200 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1202 TAILQ_FIRST(&V_ipq[i]));
1209 VNET_LIST_RUNLOCK_NOSLEEP();
1213 * Drain off all datagram fragments.
1216 ip_drain_locked(void)
1222 for (i = 0; i < IPREASS_NHASH; i++) {
1223 while(!TAILQ_EMPTY(&V_ipq[i])) {
1224 IPSTAT_ADD(ips_fragdropped,
1225 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1226 ip_freef(&V_ipq[i], TAILQ_FIRST(&V_ipq[i]));
1234 VNET_ITERATOR_DECL(vnet_iter);
1236 VNET_LIST_RLOCK_NOSLEEP();
1238 VNET_FOREACH(vnet_iter) {
1239 CURVNET_SET(vnet_iter);
1244 VNET_LIST_RUNLOCK_NOSLEEP();
1249 * The protocol to be inserted into ip_protox[] must be already registered
1250 * in inetsw[], either statically or through pf_proto_register().
1253 ipproto_register(short ipproto)
1257 /* Sanity checks. */
1258 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1259 return (EPROTONOSUPPORT);
1262 * The protocol slot must not be occupied by another protocol
1263 * already. An index pointing to IPPROTO_RAW is unused.
1265 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1267 return (EPFNOSUPPORT);
1268 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */
1271 /* Find the protocol position in inetsw[] and set the index. */
1272 for (pr = inetdomain.dom_protosw;
1273 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
1274 if (pr->pr_domain->dom_family == PF_INET &&
1275 pr->pr_protocol && pr->pr_protocol == ipproto) {
1276 ip_protox[pr->pr_protocol] = pr - inetsw;
1280 return (EPROTONOSUPPORT);
1284 ipproto_unregister(short ipproto)
1288 /* Sanity checks. */
1289 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1290 return (EPROTONOSUPPORT);
1292 /* Check if the protocol was indeed registered. */
1293 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1295 return (EPFNOSUPPORT);
1296 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */
1299 /* Reset the protocol slot to IPPROTO_RAW. */
1300 ip_protox[ipproto] = pr - inetsw;
1305 * Given address of next destination (final or next hop), return (referenced)
1306 * internet address info of interface to be used to get there.
1309 ip_rtaddr(struct in_addr dst, u_int fibnum)
1312 struct sockaddr_in *sin;
1313 struct in_ifaddr *ia;
1315 bzero(&sro, sizeof(sro));
1316 sin = (struct sockaddr_in *)&sro.ro_dst;
1317 sin->sin_family = AF_INET;
1318 sin->sin_len = sizeof(*sin);
1319 sin->sin_addr = dst;
1320 in_rtalloc_ign(&sro, 0, fibnum);
1322 if (sro.ro_rt == NULL)
1325 ia = ifatoia(sro.ro_rt->rt_ifa);
1326 ifa_ref(&ia->ia_ifa);
1331 u_char inetctlerrmap[PRC_NCMDS] = {
1333 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1334 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1335 EMSGSIZE, EHOSTUNREACH, 0, 0,
1336 0, 0, EHOSTUNREACH, 0,
1337 ENOPROTOOPT, ECONNREFUSED
1341 * Forward a packet. If some error occurs return the sender
1342 * an icmp packet. Note we can't always generate a meaningful
1343 * icmp message because icmp doesn't have a large enough repertoire
1344 * of codes and types.
1346 * If not forwarding, just drop the packet. This could be confusing
1347 * if ipforwarding was zero but some routing protocol was advancing
1348 * us as a gateway to somewhere. However, we must let the routing
1349 * protocol deal with that.
1351 * The srcrt parameter indicates whether the packet is being forwarded
1352 * via a source route.
1355 ip_forward(struct mbuf *m, int srcrt)
1357 struct ip *ip = mtod(m, struct ip *);
1358 struct in_ifaddr *ia;
1360 struct sockaddr_in *sin;
1361 struct in_addr dest;
1363 int error, type = 0, code = 0, mtu = 0;
1365 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1366 IPSTAT_INC(ips_cantforward);
1373 if (ip->ip_ttl <= IPTTLDEC) {
1374 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS,
1382 bzero(&ro, sizeof(ro));
1383 sin = (struct sockaddr_in *)&ro.ro_dst;
1384 sin->sin_family = AF_INET;
1385 sin->sin_len = sizeof(*sin);
1386 sin->sin_addr = ip->ip_dst;
1388 rtalloc_mpath_fib(&ro,
1389 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
1392 in_rtalloc_ign(&ro, 0, M_GETFIB(m));
1394 if (ro.ro_rt != NULL) {
1395 ia = ifatoia(ro.ro_rt->rt_ifa);
1396 ifa_ref(&ia->ia_ifa);
1401 * 'ia' may be NULL if there is no route for this destination.
1402 * In case of IPsec, Don't discard it just yet, but pass it to
1403 * ip_output in case of outgoing IPsec policy.
1405 if (!srcrt && ia == NULL) {
1406 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1413 * Save the IP header and at most 8 bytes of the payload,
1414 * in case we need to generate an ICMP message to the src.
1416 * XXX this can be optimized a lot by saving the data in a local
1417 * buffer on the stack (72 bytes at most), and only allocating the
1418 * mbuf if really necessary. The vast majority of the packets
1419 * are forwarded without having to send an ICMP back (either
1420 * because unnecessary, or because rate limited), so we are
1421 * really we are wasting a lot of work here.
1423 * We don't use m_copy() because it might return a reference
1424 * to a shared cluster. Both this function and ip_output()
1425 * assume exclusive access to the IP header in `m', so any
1426 * data in a cluster may change before we reach icmp_error().
1428 mcopy = m_gethdr(M_NOWAIT, m->m_type);
1429 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) {
1431 * It's probably ok if the pkthdr dup fails (because
1432 * the deep copy of the tag chain failed), but for now
1433 * be conservative and just discard the copy since
1434 * code below may some day want the tags.
1439 if (mcopy != NULL) {
1440 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
1441 mcopy->m_pkthdr.len = mcopy->m_len;
1442 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1448 ip->ip_ttl -= IPTTLDEC;
1454 * If forwarding packet using same interface that it came in on,
1455 * perhaps should send a redirect to sender to shortcut a hop.
1456 * Only send redirect if source is sending directly to us,
1457 * and if packet was not source routed (or has any options).
1458 * Also, don't send redirect if forwarding using a default route
1459 * or a route modified by a redirect.
1462 if (!srcrt && V_ipsendredirects &&
1463 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
1468 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1469 satosin(rt_key(rt))->sin_addr.s_addr != 0) {
1470 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa))
1471 u_long src = ntohl(ip->ip_src.s_addr);
1474 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) {
1475 if (rt->rt_flags & RTF_GATEWAY)
1476 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr;
1478 dest.s_addr = ip->ip_dst.s_addr;
1479 /* Router requirements says to only send host redirects */
1480 type = ICMP_REDIRECT;
1481 code = ICMP_REDIRECT_HOST;
1486 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
1488 if (error == EMSGSIZE && ro.ro_rt)
1489 mtu = ro.ro_rt->rt_mtu;
1493 IPSTAT_INC(ips_cantforward);
1495 IPSTAT_INC(ips_forward);
1497 IPSTAT_INC(ips_redirectsent);
1502 ifa_free(&ia->ia_ifa);
1506 if (mcopy == NULL) {
1508 ifa_free(&ia->ia_ifa);
1514 case 0: /* forwarded, but need redirect */
1515 /* type, code set above */
1523 type = ICMP_UNREACH;
1524 code = ICMP_UNREACH_HOST;
1528 type = ICMP_UNREACH;
1529 code = ICMP_UNREACH_NEEDFRAG;
1533 * If IPsec is configured for this path,
1534 * override any possibly mtu value set by ip_output.
1536 mtu = ip_ipsec_mtu(mcopy, mtu);
1539 * If the MTU was set before make sure we are below the
1541 * If the MTU wasn't set before use the interface mtu or
1542 * fall back to the next smaller mtu step compared to the
1543 * current packet size.
1547 mtu = min(mtu, ia->ia_ifp->if_mtu);
1550 mtu = ia->ia_ifp->if_mtu;
1552 mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
1554 IPSTAT_INC(ips_cantfrag);
1559 * A router should not generate ICMP_SOURCEQUENCH as
1560 * required in RFC1812 Requirements for IP Version 4 Routers.
1561 * Source quench could be a big problem under DoS attacks,
1562 * or if the underlying interface is rate-limited.
1563 * Those who need source quench packets may re-enable them
1564 * via the net.inet.ip.sendsourcequench sysctl.
1566 if (V_ip_sendsourcequench == 0) {
1569 ifa_free(&ia->ia_ifa);
1572 type = ICMP_SOURCEQUENCH;
1577 case EACCES: /* ipfw denied packet */
1580 ifa_free(&ia->ia_ifa);
1584 ifa_free(&ia->ia_ifa);
1585 icmp_error(mcopy, type, code, dest.s_addr, mtu);
1589 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1593 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) {
1597 if (inp->inp_socket->so_options & SO_BINTIME) {
1598 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt),
1599 SCM_BINTIME, SOL_SOCKET);
1601 mp = &(*mp)->m_next;
1603 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1606 bintime2timeval(&bt, &tv);
1607 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1608 SCM_TIMESTAMP, SOL_SOCKET);
1610 mp = &(*mp)->m_next;
1613 if (inp->inp_flags & INP_RECVDSTADDR) {
1614 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst,
1615 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1617 mp = &(*mp)->m_next;
1619 if (inp->inp_flags & INP_RECVTTL) {
1620 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl,
1621 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
1623 mp = &(*mp)->m_next;
1627 * Moving these out of udp_input() made them even more broken
1628 * than they already were.
1630 /* options were tossed already */
1631 if (inp->inp_flags & INP_RECVOPTS) {
1632 *mp = sbcreatecontrol((caddr_t)opts_deleted_above,
1633 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1635 mp = &(*mp)->m_next;
1637 /* ip_srcroute doesn't do what we want here, need to fix */
1638 if (inp->inp_flags & INP_RECVRETOPTS) {
1639 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m),
1640 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1642 mp = &(*mp)->m_next;
1645 if (inp->inp_flags & INP_RECVIF) {
1648 struct sockaddr_dl sdl;
1651 struct sockaddr_dl *sdp;
1652 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
1654 if ((ifp = m->m_pkthdr.rcvif) &&
1655 ifp->if_index && ifp->if_index <= V_if_index) {
1656 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
1658 * Change our mind and don't try copy.
1660 if (sdp->sdl_family != AF_LINK ||
1661 sdp->sdl_len > sizeof(sdlbuf)) {
1664 bcopy(sdp, sdl2, sdp->sdl_len);
1668 offsetof(struct sockaddr_dl, sdl_data[0]);
1669 sdl2->sdl_family = AF_LINK;
1670 sdl2->sdl_index = 0;
1671 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
1673 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len,
1674 IP_RECVIF, IPPROTO_IP);
1676 mp = &(*mp)->m_next;
1678 if (inp->inp_flags & INP_RECVTOS) {
1679 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos,
1680 sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
1682 mp = &(*mp)->m_next;
1687 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
1688 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
1689 * locking. This code remains in ip_input.c as ip_mroute.c is optionally
1692 static VNET_DEFINE(int, ip_rsvp_on);
1693 VNET_DEFINE(struct socket *, ip_rsvpd);
1695 #define V_ip_rsvp_on VNET(ip_rsvp_on)
1698 ip_rsvp_init(struct socket *so)
1701 if (so->so_type != SOCK_RAW ||
1702 so->so_proto->pr_protocol != IPPROTO_RSVP)
1705 if (V_ip_rsvpd != NULL)
1710 * This may seem silly, but we need to be sure we don't over-increment
1711 * the RSVP counter, in case something slips up.
1713 if (!V_ip_rsvp_on) {
1727 * This may seem silly, but we need to be sure we don't over-decrement
1728 * the RSVP counter, in case something slips up.
1738 rsvp_input(struct mbuf *m, int off) /* XXX must fixup manually */
1741 if (rsvp_input_p) { /* call the real one if loaded */
1742 rsvp_input_p(m, off);
1746 /* Can still get packets with rsvp_on = 0 if there is a local member
1747 * of the group to which the RSVP packet is addressed. But in this
1748 * case we want to throw the packet away.
1756 if (V_ip_rsvpd != NULL) {
1760 /* Drop the packet */