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_route.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/malloc.h>
45 #include <sys/domain.h>
46 #include <sys/protosw.h>
47 #include <sys/socket.h>
49 #include <sys/kernel.h>
51 #include <sys/rwlock.h>
53 #include <sys/syslog.h>
54 #include <sys/sysctl.h>
58 #include <net/if_types.h>
59 #include <net/if_var.h>
60 #include <net/if_dl.h>
61 #include <net/route.h>
62 #include <net/netisr.h>
65 #include <netinet/in.h>
66 #include <netinet/in_kdtrace.h>
67 #include <netinet/in_systm.h>
68 #include <netinet/in_var.h>
69 #include <netinet/ip.h>
70 #include <netinet/in_pcb.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/ip_fw.h>
73 #include <netinet/ip_icmp.h>
74 #include <netinet/ip_options.h>
75 #include <machine/in_cksum.h>
76 #include <netinet/ip_carp.h>
78 #include <netinet/ip_ipsec.h>
81 #include <sys/socketvar.h>
83 #include <security/mac/mac_framework.h>
86 CTASSERT(sizeof(struct ip) == 20);
89 struct rwlock in_ifaddr_lock;
90 RW_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock");
92 VNET_DEFINE(int, rsvp_on);
94 VNET_DEFINE(int, ipforwarding);
95 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW,
96 &VNET_NAME(ipforwarding), 0,
97 "Enable IP forwarding between interfaces");
99 static VNET_DEFINE(int, ipsendredirects) = 1; /* XXX */
100 #define V_ipsendredirects VNET(ipsendredirects)
101 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
102 &VNET_NAME(ipsendredirects), 0,
103 "Enable sending IP redirects");
105 static VNET_DEFINE(int, ip_keepfaith);
106 #define V_ip_keepfaith VNET(ip_keepfaith)
107 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
108 &VNET_NAME(ip_keepfaith), 0,
109 "Enable packet capture for FAITH IPv4->IPv6 translater daemon");
111 static VNET_DEFINE(int, ip_sendsourcequench);
112 #define V_ip_sendsourcequench VNET(ip_sendsourcequench)
113 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
114 &VNET_NAME(ip_sendsourcequench), 0,
115 "Enable the transmission of source quench packets");
117 VNET_DEFINE(int, ip_do_randomid);
118 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
119 &VNET_NAME(ip_do_randomid), 0,
120 "Assign random ip_id values");
123 * XXX - Setting ip_checkinterface mostly implements the receive side of
124 * the Strong ES model described in RFC 1122, but since the routing table
125 * and transmit implementation do not implement the Strong ES model,
126 * setting this to 1 results in an odd hybrid.
128 * XXX - ip_checkinterface currently must be disabled if you use ipnat
129 * to translate the destination address to another local interface.
131 * XXX - ip_checkinterface must be disabled if you add IP aliases
132 * to the loopback interface instead of the interface where the
133 * packets for those addresses are received.
135 static VNET_DEFINE(int, ip_checkinterface);
136 #define V_ip_checkinterface VNET(ip_checkinterface)
137 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
138 &VNET_NAME(ip_checkinterface), 0,
139 "Verify packet arrives on correct interface");
141 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */
143 static struct netisr_handler ip_nh = {
145 .nh_handler = ip_input,
146 .nh_proto = NETISR_IP,
147 .nh_policy = NETISR_POLICY_FLOW,
150 extern struct domain inetdomain;
151 extern struct protosw inetsw[];
152 u_char ip_protox[IPPROTO_MAX];
153 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
154 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
155 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
157 static VNET_DEFINE(uma_zone_t, ipq_zone);
158 static VNET_DEFINE(TAILQ_HEAD(ipqhead, ipq), ipq[IPREASS_NHASH]);
159 static struct mtx ipqlock;
161 #define V_ipq_zone VNET(ipq_zone)
162 #define V_ipq VNET(ipq)
164 #define IPQ_LOCK() mtx_lock(&ipqlock)
165 #define IPQ_UNLOCK() mtx_unlock(&ipqlock)
166 #define IPQ_LOCK_INIT() mtx_init(&ipqlock, "ipqlock", NULL, MTX_DEF)
167 #define IPQ_LOCK_ASSERT() mtx_assert(&ipqlock, MA_OWNED)
169 static void maxnipq_update(void);
170 static void ipq_zone_change(void *);
171 static void ip_drain_locked(void);
173 static VNET_DEFINE(int, maxnipq); /* Administrative limit on # reass queues. */
174 static VNET_DEFINE(int, nipq); /* Total # of reass queues */
175 #define V_maxnipq VNET(maxnipq)
176 #define V_nipq VNET(nipq)
177 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD,
179 "Current number of IPv4 fragment reassembly queue entries");
181 static VNET_DEFINE(int, maxfragsperpacket);
182 #define V_maxfragsperpacket VNET(maxfragsperpacket)
183 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
184 &VNET_NAME(maxfragsperpacket), 0,
185 "Maximum number of IPv4 fragments allowed per packet");
188 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
189 &ip_mtu, 0, "Default MTU");
193 VNET_DEFINE(int, ipstealth);
194 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW,
195 &VNET_NAME(ipstealth), 0,
196 "IP stealth mode, no TTL decrementation on forwarding");
199 static void ip_freef(struct ipqhead *, struct ipq *);
202 * IP statistics are stored in the "array" of counter(9)s.
204 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat);
205 VNET_PCPUSTAT_SYSINIT(ipstat);
206 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat,
207 "IP statistics (struct ipstat, netinet/ip_var.h)");
210 VNET_PCPUSTAT_SYSUNINIT(ipstat);
214 * Kernel module interface for updating ipstat. The argument is an index
215 * into ipstat treated as an array.
218 kmod_ipstat_inc(int statnum)
221 counter_u64_add(VNET(ipstat)[statnum], 1);
225 kmod_ipstat_dec(int statnum)
228 counter_u64_add(VNET(ipstat)[statnum], -1);
232 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
236 netisr_getqlimit(&ip_nh, &qlimit);
237 error = sysctl_handle_int(oidp, &qlimit, 0, req);
238 if (error || !req->newptr)
242 return (netisr_setqlimit(&ip_nh, qlimit));
244 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
245 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I",
246 "Maximum size of the IP input queue");
249 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
251 u_int64_t qdrops_long;
254 netisr_getqdrops(&ip_nh, &qdrops_long);
255 qdrops = qdrops_long;
256 error = sysctl_handle_int(oidp, &qdrops, 0, req);
257 if (error || !req->newptr)
261 netisr_clearqdrops(&ip_nh);
265 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
266 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I",
267 "Number of packets dropped from the IP input queue");
270 * IP initialization: fill in IP protocol switch table.
271 * All protocols not implemented in kernel go to raw IP protocol handler.
279 V_ip_id = time_second & 0xffff;
281 TAILQ_INIT(&V_in_ifaddrhead);
282 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
284 /* Initialize IP reassembly queue. */
285 for (i = 0; i < IPREASS_NHASH; i++)
286 TAILQ_INIT(&V_ipq[i]);
287 V_maxnipq = nmbclusters / 32;
288 V_maxfragsperpacket = 16;
289 V_ipq_zone = uma_zcreate("ipq", sizeof(struct ipq), NULL, NULL, NULL,
290 NULL, UMA_ALIGN_PTR, 0);
293 /* Initialize packet filter hooks. */
294 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF;
295 V_inet_pfil_hook.ph_af = AF_INET;
296 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0)
297 printf("%s: WARNING: unable to register pfil hook, "
298 "error %d\n", __func__, i);
300 /* Skip initialization of globals for non-default instances. */
301 if (!IS_DEFAULT_VNET(curvnet))
304 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
306 panic("ip_init: PF_INET not found");
308 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
309 for (i = 0; i < IPPROTO_MAX; i++)
310 ip_protox[i] = pr - inetsw;
312 * Cycle through IP protocols and put them into the appropriate place
315 for (pr = inetdomain.dom_protosw;
316 pr < inetdomain.dom_protoswNPROTOSW; pr++)
317 if (pr->pr_domain->dom_family == PF_INET &&
318 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
319 /* Be careful to only index valid IP protocols. */
320 if (pr->pr_protocol < IPPROTO_MAX)
321 ip_protox[pr->pr_protocol] = pr - inetsw;
324 EVENTHANDLER_REGISTER(nmbclusters_change, ipq_zone_change,
325 NULL, EVENTHANDLER_PRI_ANY);
327 /* Initialize various other remaining things. */
329 netisr_register(&ip_nh);
338 if ((i = pfil_head_unregister(&V_inet_pfil_hook)) != 0)
339 printf("%s: WARNING: unable to unregister pfil hook, "
340 "error %d\n", __func__, i);
342 /* Cleanup in_ifaddr hash table; should be empty. */
343 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
349 uma_zdestroy(V_ipq_zone);
354 * Ip input routine. Checksum and byte swap header. If fragmented
355 * try to reassemble. Process options. Pass to next level.
358 ip_input(struct mbuf *m)
360 struct ip *ip = NULL;
361 struct in_ifaddr *ia = NULL;
364 int checkif, hlen = 0;
365 uint16_t sum, ip_len;
366 int dchg = 0; /* dest changed after fw */
367 struct in_addr odst; /* original dst address */
371 if (m->m_flags & M_FASTFWD_OURS) {
372 m->m_flags &= ~M_FASTFWD_OURS;
373 /* Set up some basics that will be used later. */
374 ip = mtod(m, struct ip *);
375 hlen = ip->ip_hl << 2;
376 ip_len = ntohs(ip->ip_len);
380 IPSTAT_INC(ips_total);
382 if (m->m_pkthdr.len < sizeof(struct ip))
385 if (m->m_len < sizeof (struct ip) &&
386 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
387 IPSTAT_INC(ips_toosmall);
390 ip = mtod(m, struct ip *);
392 if (ip->ip_v != IPVERSION) {
393 IPSTAT_INC(ips_badvers);
397 hlen = ip->ip_hl << 2;
398 if (hlen < sizeof(struct ip)) { /* minimum header length */
399 IPSTAT_INC(ips_badhlen);
402 if (hlen > m->m_len) {
403 if ((m = m_pullup(m, hlen)) == NULL) {
404 IPSTAT_INC(ips_badhlen);
407 ip = mtod(m, struct ip *);
410 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
412 /* 127/8 must not appear on wire - RFC1122 */
413 ifp = m->m_pkthdr.rcvif;
414 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
415 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
416 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
417 IPSTAT_INC(ips_badaddr);
422 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
423 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
425 if (hlen == sizeof(struct ip)) {
426 sum = in_cksum_hdr(ip);
428 sum = in_cksum(m, hlen);
432 IPSTAT_INC(ips_badsum);
437 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
438 /* packet is dropped by traffic conditioner */
442 ip_len = ntohs(ip->ip_len);
444 IPSTAT_INC(ips_badlen);
449 * Check that the amount of data in the buffers
450 * is as at least much as the IP header would have us expect.
451 * Trim mbufs if longer than we expect.
452 * Drop packet if shorter than we expect.
454 if (m->m_pkthdr.len < ip_len) {
456 IPSTAT_INC(ips_tooshort);
459 if (m->m_pkthdr.len > ip_len) {
460 if (m->m_len == m->m_pkthdr.len) {
462 m->m_pkthdr.len = ip_len;
464 m_adj(m, ip_len - m->m_pkthdr.len);
468 * Bypass packet filtering for packets previously handled by IPsec.
470 if (ip_ipsec_filtertunnel(m))
475 * Run through list of hooks for input packets.
477 * NB: Beware of the destination address changing (e.g.
478 * by NAT rewriting). When this happens, tell
479 * ip_forward to do the right thing.
482 /* Jump over all PFIL processing if hooks are not active. */
483 if (!PFIL_HOOKED(&V_inet_pfil_hook))
487 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0)
489 if (m == NULL) /* consumed by filter */
492 ip = mtod(m, struct ip *);
493 dchg = (odst.s_addr != ip->ip_dst.s_addr);
494 ifp = m->m_pkthdr.rcvif;
496 if (m->m_flags & M_FASTFWD_OURS) {
497 m->m_flags &= ~M_FASTFWD_OURS;
500 if (m->m_flags & M_IP_NEXTHOP) {
501 dchg = (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL);
504 * Directly ship the packet on. This allows
505 * forwarding packets originally destined to us
506 * to some other directly connected host.
515 * Process options and, if not destined for us,
516 * ship it on. ip_dooptions returns 1 when an
517 * error was detected (causing an icmp message
518 * to be sent and the original packet to be freed).
520 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
523 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
524 * matter if it is destined to another node, or whether it is
525 * a multicast one, RSVP wants it! and prevents it from being forwarded
526 * anywhere else. Also checks if the rsvp daemon is running before
527 * grabbing the packet.
529 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
533 * Check our list of addresses, to see if the packet is for us.
534 * If we don't have any addresses, assume any unicast packet
535 * we receive might be for us (and let the upper layers deal
538 if (TAILQ_EMPTY(&V_in_ifaddrhead) &&
539 (m->m_flags & (M_MCAST|M_BCAST)) == 0)
543 * Enable a consistency check between the destination address
544 * and the arrival interface for a unicast packet (the RFC 1122
545 * strong ES model) if IP forwarding is disabled and the packet
546 * is not locally generated and the packet is not subject to
549 * XXX - Checking also should be disabled if the destination
550 * address is ipnat'ed to a different interface.
552 * XXX - Checking is incompatible with IP aliases added
553 * to the loopback interface instead of the interface where
554 * the packets are received.
556 * XXX - This is the case for carp vhost IPs as well so we
557 * insert a workaround. If the packet got here, we already
558 * checked with carp_iamatch() and carp_forus().
560 checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
561 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
562 ifp->if_carp == NULL && (dchg == 0);
565 * Check for exact addresses in the hash bucket.
567 /* IN_IFADDR_RLOCK(); */
568 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
570 * If the address matches, verify that the packet
571 * arrived via the correct interface if checking is
574 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
575 (!checkif || ia->ia_ifp == ifp)) {
576 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
577 counter_u64_add(ia->ia_ifa.ifa_ibytes,
579 /* IN_IFADDR_RUNLOCK(); */
583 /* IN_IFADDR_RUNLOCK(); */
586 * Check for broadcast addresses.
588 * Only accept broadcast packets that arrive via the matching
589 * interface. Reception of forwarded directed broadcasts would
590 * be handled via ip_forward() and ether_output() with the loopback
591 * into the stack for SIMPLEX interfaces handled by ether_output().
593 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
595 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
596 if (ifa->ifa_addr->sa_family != AF_INET)
599 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
601 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
602 counter_u64_add(ia->ia_ifa.ifa_ibytes,
604 IF_ADDR_RUNLOCK(ifp);
608 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
609 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
610 counter_u64_add(ia->ia_ifa.ifa_ibytes,
612 IF_ADDR_RUNLOCK(ifp);
617 IF_ADDR_RUNLOCK(ifp);
620 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
621 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
622 IPSTAT_INC(ips_cantforward);
626 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
629 * If we are acting as a multicast router, all
630 * incoming multicast packets are passed to the
631 * kernel-level multicast forwarding function.
632 * The packet is returned (relatively) intact; if
633 * ip_mforward() returns a non-zero value, the packet
634 * must be discarded, else it may be accepted below.
636 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
637 IPSTAT_INC(ips_cantforward);
643 * The process-level routing daemon needs to receive
644 * all multicast IGMP packets, whether or not this
645 * host belongs to their destination groups.
647 if (ip->ip_p == IPPROTO_IGMP)
649 IPSTAT_INC(ips_forward);
652 * Assume the packet is for us, to avoid prematurely taking
653 * a lock on the in_multi hash. Protocols must perform
654 * their own filtering and update statistics accordingly.
658 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
660 if (ip->ip_dst.s_addr == INADDR_ANY)
664 * FAITH(Firewall Aided Internet Translator)
666 if (ifp && ifp->if_type == IFT_FAITH) {
667 if (V_ip_keepfaith) {
668 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
676 * Not for us; forward if possible and desirable.
678 if (V_ipforwarding == 0) {
679 IPSTAT_INC(ips_cantforward);
693 * IPSTEALTH: Process non-routing options only
694 * if the packet is destined for us.
696 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1))
698 #endif /* IPSTEALTH */
701 * Attempt reassembly; if it succeeds, proceed.
702 * ip_reass() will return a different mbuf.
704 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
708 ip = mtod(m, struct ip *);
709 /* Get the header length of the reassembled packet */
710 hlen = ip->ip_hl << 2;
715 * enforce IPsec policy checking if we are seeing last header.
716 * note that we do not visit this with protocols with pcb layer
717 * code - like udp/tcp/raw ip.
719 if (ip_ipsec_input(m))
724 * Switch out to protocol's input routine.
726 IPSTAT_INC(ips_delivered);
728 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
735 * After maxnipq has been updated, propagate the change to UMA. The UMA zone
736 * max has slightly different semantics than the sysctl, for historical
744 * -1 for unlimited allocation.
747 uma_zone_set_max(V_ipq_zone, 0);
749 * Positive number for specific bound.
752 uma_zone_set_max(V_ipq_zone, V_maxnipq);
754 * Zero specifies no further fragment queue allocation -- set the
755 * bound very low, but rely on implementation elsewhere to actually
756 * prevent allocation and reclaim current queues.
759 uma_zone_set_max(V_ipq_zone, 1);
763 ipq_zone_change(void *tag)
766 if (V_maxnipq > 0 && V_maxnipq < (nmbclusters / 32)) {
767 V_maxnipq = nmbclusters / 32;
773 sysctl_maxnipq(SYSCTL_HANDLER_ARGS)
778 error = sysctl_handle_int(oidp, &i, 0, req);
779 if (error || !req->newptr)
783 * XXXRW: Might be a good idea to sanity check the argument and place
784 * an extreme upper bound.
793 SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragpackets, CTLTYPE_INT|CTLFLAG_RW,
794 NULL, 0, sysctl_maxnipq, "I",
795 "Maximum number of IPv4 fragment reassembly queue entries");
798 * Take incoming datagram fragment and try to reassemble it into
799 * whole datagram. If the argument is the first fragment or one
800 * in between the function will return NULL and store the mbuf
801 * in the fragment chain. If the argument is the last fragment
802 * the packet will be reassembled and the pointer to the new
803 * mbuf returned for further processing. Only m_tags attached
804 * to the first packet/fragment are preserved.
805 * The IP header is *NOT* adjusted out of iplen.
808 ip_reass(struct mbuf *m)
811 struct mbuf *p, *q, *nq, *t;
812 struct ipq *fp = NULL;
813 struct ipqhead *head;
818 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
819 if (V_maxnipq == 0 || V_maxfragsperpacket == 0) {
820 IPSTAT_INC(ips_fragments);
821 IPSTAT_INC(ips_fragdropped);
826 ip = mtod(m, struct ip *);
827 hlen = ip->ip_hl << 2;
829 hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
834 * Look for queue of fragments
837 TAILQ_FOREACH(fp, head, ipq_list)
838 if (ip->ip_id == fp->ipq_id &&
839 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
840 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
842 mac_ipq_match(m, fp) &&
844 ip->ip_p == fp->ipq_p)
850 * Attempt to trim the number of allocated fragment queues if it
851 * exceeds the administrative limit.
853 if ((V_nipq > V_maxnipq) && (V_maxnipq > 0)) {
855 * drop something from the tail of the current queue
856 * before proceeding further
858 struct ipq *q = TAILQ_LAST(head, ipqhead);
859 if (q == NULL) { /* gak */
860 for (i = 0; i < IPREASS_NHASH; i++) {
861 struct ipq *r = TAILQ_LAST(&V_ipq[i], ipqhead);
863 IPSTAT_ADD(ips_fragtimeout,
865 ip_freef(&V_ipq[i], r);
870 IPSTAT_ADD(ips_fragtimeout, q->ipq_nfrags);
877 * Adjust ip_len to not reflect header,
878 * convert offset of this to bytes.
880 ip->ip_len = htons(ntohs(ip->ip_len) - hlen);
881 if (ip->ip_off & htons(IP_MF)) {
883 * Make sure that fragments have a data length
884 * that's a non-zero multiple of 8 bytes.
886 if (ip->ip_len == htons(0) || (ntohs(ip->ip_len) & 0x7) != 0) {
887 IPSTAT_INC(ips_toosmall); /* XXX */
890 m->m_flags |= M_IP_FRAG;
892 m->m_flags &= ~M_IP_FRAG;
893 ip->ip_off = htons(ntohs(ip->ip_off) << 3);
896 * Attempt reassembly; if it succeeds, proceed.
897 * ip_reass() will return a different mbuf.
899 IPSTAT_INC(ips_fragments);
900 m->m_pkthdr.PH_loc.ptr = ip;
902 /* Previous ip_reass() started here. */
904 * Presence of header sizes in mbufs
905 * would confuse code below.
911 * If first fragment to arrive, create a reassembly queue.
914 fp = uma_zalloc(V_ipq_zone, M_NOWAIT);
918 if (mac_ipq_init(fp, M_NOWAIT) != 0) {
919 uma_zfree(V_ipq_zone, fp);
923 mac_ipq_create(m, fp);
925 TAILQ_INSERT_HEAD(head, fp, ipq_list);
928 fp->ipq_ttl = IPFRAGTTL;
929 fp->ipq_p = ip->ip_p;
930 fp->ipq_id = ip->ip_id;
931 fp->ipq_src = ip->ip_src;
932 fp->ipq_dst = ip->ip_dst;
939 mac_ipq_update(m, fp);
943 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.PH_loc.ptr))
946 * Handle ECN by comparing this segment with the first one;
947 * if CE is set, do not lose CE.
948 * drop if CE and not-ECT are mixed for the same packet.
950 ecn = ip->ip_tos & IPTOS_ECN_MASK;
951 ecn0 = GETIP(fp->ipq_frags)->ip_tos & IPTOS_ECN_MASK;
952 if (ecn == IPTOS_ECN_CE) {
953 if (ecn0 == IPTOS_ECN_NOTECT)
955 if (ecn0 != IPTOS_ECN_CE)
956 GETIP(fp->ipq_frags)->ip_tos |= IPTOS_ECN_CE;
958 if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT)
962 * Find a segment which begins after this one does.
964 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
965 if (ntohs(GETIP(q)->ip_off) > ntohs(ip->ip_off))
969 * If there is a preceding segment, it may provide some of
970 * our data already. If so, drop the data from the incoming
971 * segment. If it provides all of our data, drop us, otherwise
972 * stick new segment in the proper place.
974 * If some of the data is dropped from the preceding
975 * segment, then it's checksum is invalidated.
978 i = ntohs(GETIP(p)->ip_off) + ntohs(GETIP(p)->ip_len) -
981 if (i >= ntohs(ip->ip_len))
984 m->m_pkthdr.csum_flags = 0;
985 ip->ip_off = htons(ntohs(ip->ip_off) + i);
986 ip->ip_len = htons(ntohs(ip->ip_len) - i);
988 m->m_nextpkt = p->m_nextpkt;
991 m->m_nextpkt = fp->ipq_frags;
996 * While we overlap succeeding segments trim them or,
997 * if they are completely covered, dequeue them.
999 for (; q != NULL && ntohs(ip->ip_off) + ntohs(ip->ip_len) >
1000 ntohs(GETIP(q)->ip_off); q = nq) {
1001 i = (ntohs(ip->ip_off) + ntohs(ip->ip_len)) -
1002 ntohs(GETIP(q)->ip_off);
1003 if (i < ntohs(GETIP(q)->ip_len)) {
1004 GETIP(q)->ip_len = htons(ntohs(GETIP(q)->ip_len) - i);
1005 GETIP(q)->ip_off = htons(ntohs(GETIP(q)->ip_off) + i);
1007 q->m_pkthdr.csum_flags = 0;
1012 IPSTAT_INC(ips_fragdropped);
1018 * Check for complete reassembly and perform frag per packet
1021 * Frag limiting is performed here so that the nth frag has
1022 * a chance to complete the packet before we drop the packet.
1023 * As a result, n+1 frags are actually allowed per packet, but
1024 * only n will ever be stored. (n = maxfragsperpacket.)
1028 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1029 if (ntohs(GETIP(q)->ip_off) != next) {
1030 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1031 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1036 next += ntohs(GETIP(q)->ip_len);
1038 /* Make sure the last packet didn't have the IP_MF flag */
1039 if (p->m_flags & M_IP_FRAG) {
1040 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1041 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1048 * Reassembly is complete. Make sure the packet is a sane size.
1052 if (next + (ip->ip_hl << 2) > IP_MAXPACKET) {
1053 IPSTAT_INC(ips_toolong);
1054 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1060 * Concatenate fragments.
1067 q->m_nextpkt = NULL;
1068 for (q = nq; q != NULL; q = nq) {
1070 q->m_nextpkt = NULL;
1071 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1072 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1076 * In order to do checksumming faster we do 'end-around carry' here
1077 * (and not in for{} loop), though it implies we are not going to
1078 * reassemble more than 64k fragments.
1080 m->m_pkthdr.csum_data =
1081 (m->m_pkthdr.csum_data & 0xffff) + (m->m_pkthdr.csum_data >> 16);
1083 mac_ipq_reassemble(fp, m);
1084 mac_ipq_destroy(fp);
1088 * Create header for new ip packet by modifying header of first
1089 * packet; dequeue and discard fragment reassembly header.
1090 * Make header visible.
1092 ip->ip_len = htons((ip->ip_hl << 2) + next);
1093 ip->ip_src = fp->ipq_src;
1094 ip->ip_dst = fp->ipq_dst;
1095 TAILQ_REMOVE(head, fp, ipq_list);
1097 uma_zfree(V_ipq_zone, fp);
1098 m->m_len += (ip->ip_hl << 2);
1099 m->m_data -= (ip->ip_hl << 2);
1100 /* some debugging cruft by sklower, below, will go away soon */
1101 if (m->m_flags & M_PKTHDR) /* XXX this should be done elsewhere */
1103 IPSTAT_INC(ips_reassembled);
1108 IPSTAT_INC(ips_fragdropped);
1120 * Free a fragment reassembly header and all
1121 * associated datagrams.
1124 ip_freef(struct ipqhead *fhp, struct ipq *fp)
1130 while (fp->ipq_frags) {
1132 fp->ipq_frags = q->m_nextpkt;
1135 TAILQ_REMOVE(fhp, fp, ipq_list);
1136 uma_zfree(V_ipq_zone, fp);
1141 * IP timer processing;
1142 * if a timer expires on a reassembly
1143 * queue, discard it.
1148 VNET_ITERATOR_DECL(vnet_iter);
1152 VNET_LIST_RLOCK_NOSLEEP();
1154 VNET_FOREACH(vnet_iter) {
1155 CURVNET_SET(vnet_iter);
1156 for (i = 0; i < IPREASS_NHASH; i++) {
1157 for(fp = TAILQ_FIRST(&V_ipq[i]); fp;) {
1161 fp = TAILQ_NEXT(fp, ipq_list);
1162 if(--fpp->ipq_ttl == 0) {
1163 IPSTAT_ADD(ips_fragtimeout,
1165 ip_freef(&V_ipq[i], fpp);
1170 * If we are over the maximum number of fragments
1171 * (due to the limit being lowered), drain off
1172 * enough to get down to the new limit.
1174 if (V_maxnipq >= 0 && V_nipq > V_maxnipq) {
1175 for (i = 0; i < IPREASS_NHASH; i++) {
1176 while (V_nipq > V_maxnipq &&
1177 !TAILQ_EMPTY(&V_ipq[i])) {
1178 IPSTAT_ADD(ips_fragdropped,
1179 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1181 TAILQ_FIRST(&V_ipq[i]));
1188 VNET_LIST_RUNLOCK_NOSLEEP();
1192 * Drain off all datagram fragments.
1195 ip_drain_locked(void)
1201 for (i = 0; i < IPREASS_NHASH; i++) {
1202 while(!TAILQ_EMPTY(&V_ipq[i])) {
1203 IPSTAT_ADD(ips_fragdropped,
1204 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1205 ip_freef(&V_ipq[i], TAILQ_FIRST(&V_ipq[i]));
1213 VNET_ITERATOR_DECL(vnet_iter);
1215 VNET_LIST_RLOCK_NOSLEEP();
1217 VNET_FOREACH(vnet_iter) {
1218 CURVNET_SET(vnet_iter);
1223 VNET_LIST_RUNLOCK_NOSLEEP();
1228 * The protocol to be inserted into ip_protox[] must be already registered
1229 * in inetsw[], either statically or through pf_proto_register().
1232 ipproto_register(short ipproto)
1236 /* Sanity checks. */
1237 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1238 return (EPROTONOSUPPORT);
1241 * The protocol slot must not be occupied by another protocol
1242 * already. An index pointing to IPPROTO_RAW is unused.
1244 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1246 return (EPFNOSUPPORT);
1247 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */
1250 /* Find the protocol position in inetsw[] and set the index. */
1251 for (pr = inetdomain.dom_protosw;
1252 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
1253 if (pr->pr_domain->dom_family == PF_INET &&
1254 pr->pr_protocol && pr->pr_protocol == ipproto) {
1255 ip_protox[pr->pr_protocol] = pr - inetsw;
1259 return (EPROTONOSUPPORT);
1263 ipproto_unregister(short ipproto)
1267 /* Sanity checks. */
1268 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1269 return (EPROTONOSUPPORT);
1271 /* Check if the protocol was indeed registered. */
1272 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1274 return (EPFNOSUPPORT);
1275 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */
1278 /* Reset the protocol slot to IPPROTO_RAW. */
1279 ip_protox[ipproto] = pr - inetsw;
1284 * Given address of next destination (final or next hop), return (referenced)
1285 * internet address info of interface to be used to get there.
1288 ip_rtaddr(struct in_addr dst, u_int fibnum)
1291 struct sockaddr_in *sin;
1292 struct in_ifaddr *ia;
1294 bzero(&sro, sizeof(sro));
1295 sin = (struct sockaddr_in *)&sro.ro_dst;
1296 sin->sin_family = AF_INET;
1297 sin->sin_len = sizeof(*sin);
1298 sin->sin_addr = dst;
1299 in_rtalloc_ign(&sro, 0, fibnum);
1301 if (sro.ro_rt == NULL)
1304 ia = ifatoia(sro.ro_rt->rt_ifa);
1305 ifa_ref(&ia->ia_ifa);
1310 u_char inetctlerrmap[PRC_NCMDS] = {
1312 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1313 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1314 EMSGSIZE, EHOSTUNREACH, 0, 0,
1315 0, 0, EHOSTUNREACH, 0,
1316 ENOPROTOOPT, ECONNREFUSED
1320 * Forward a packet. If some error occurs return the sender
1321 * an icmp packet. Note we can't always generate a meaningful
1322 * icmp message because icmp doesn't have a large enough repertoire
1323 * of codes and types.
1325 * If not forwarding, just drop the packet. This could be confusing
1326 * if ipforwarding was zero but some routing protocol was advancing
1327 * us as a gateway to somewhere. However, we must let the routing
1328 * protocol deal with that.
1330 * The srcrt parameter indicates whether the packet is being forwarded
1331 * via a source route.
1334 ip_forward(struct mbuf *m, int srcrt)
1336 struct ip *ip = mtod(m, struct ip *);
1337 struct in_ifaddr *ia;
1339 struct in_addr dest;
1341 int error, type = 0, code = 0, mtu = 0;
1343 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1344 IPSTAT_INC(ips_cantforward);
1351 if (ip->ip_ttl <= IPTTLDEC) {
1352 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS,
1360 ia = ip_rtaddr(ip->ip_dst, M_GETFIB(m));
1363 * 'ia' may be NULL if there is no route for this destination.
1364 * In case of IPsec, Don't discard it just yet, but pass it to
1365 * ip_output in case of outgoing IPsec policy.
1367 if (!srcrt && ia == NULL) {
1368 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1374 * Save the IP header and at most 8 bytes of the payload,
1375 * in case we need to generate an ICMP message to the src.
1377 * XXX this can be optimized a lot by saving the data in a local
1378 * buffer on the stack (72 bytes at most), and only allocating the
1379 * mbuf if really necessary. The vast majority of the packets
1380 * are forwarded without having to send an ICMP back (either
1381 * because unnecessary, or because rate limited), so we are
1382 * really we are wasting a lot of work here.
1384 * We don't use m_copy() because it might return a reference
1385 * to a shared cluster. Both this function and ip_output()
1386 * assume exclusive access to the IP header in `m', so any
1387 * data in a cluster may change before we reach icmp_error().
1389 mcopy = m_gethdr(M_NOWAIT, m->m_type);
1390 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) {
1392 * It's probably ok if the pkthdr dup fails (because
1393 * the deep copy of the tag chain failed), but for now
1394 * be conservative and just discard the copy since
1395 * code below may some day want the tags.
1400 if (mcopy != NULL) {
1401 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
1402 mcopy->m_pkthdr.len = mcopy->m_len;
1403 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1409 ip->ip_ttl -= IPTTLDEC;
1415 * If forwarding packet using same interface that it came in on,
1416 * perhaps should send a redirect to sender to shortcut a hop.
1417 * Only send redirect if source is sending directly to us,
1418 * and if packet was not source routed (or has any options).
1419 * Also, don't send redirect if forwarding using a default route
1420 * or a route modified by a redirect.
1423 if (!srcrt && V_ipsendredirects &&
1424 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
1425 struct sockaddr_in *sin;
1428 bzero(&ro, sizeof(ro));
1429 sin = (struct sockaddr_in *)&ro.ro_dst;
1430 sin->sin_family = AF_INET;
1431 sin->sin_len = sizeof(*sin);
1432 sin->sin_addr = ip->ip_dst;
1433 in_rtalloc_ign(&ro, 0, M_GETFIB(m));
1437 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1438 satosin(rt_key(rt))->sin_addr.s_addr != 0) {
1439 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa))
1440 u_long src = ntohl(ip->ip_src.s_addr);
1443 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) {
1444 if (rt->rt_flags & RTF_GATEWAY)
1445 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr;
1447 dest.s_addr = ip->ip_dst.s_addr;
1448 /* Router requirements says to only send host redirects */
1449 type = ICMP_REDIRECT;
1450 code = ICMP_REDIRECT_HOST;
1458 * Try to cache the route MTU from ip_output so we can consider it for
1459 * the ICMP_UNREACH_NEEDFRAG "Next-Hop MTU" field described in RFC1191.
1461 bzero(&ro, sizeof(ro));
1463 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
1465 if (error == EMSGSIZE && ro.ro_rt)
1466 mtu = ro.ro_rt->rt_rmx.rmx_mtu;
1470 IPSTAT_INC(ips_cantforward);
1472 IPSTAT_INC(ips_forward);
1474 IPSTAT_INC(ips_redirectsent);
1479 ifa_free(&ia->ia_ifa);
1483 if (mcopy == NULL) {
1485 ifa_free(&ia->ia_ifa);
1491 case 0: /* forwarded, but need redirect */
1492 /* type, code set above */
1500 type = ICMP_UNREACH;
1501 code = ICMP_UNREACH_HOST;
1505 type = ICMP_UNREACH;
1506 code = ICMP_UNREACH_NEEDFRAG;
1510 * If IPsec is configured for this path,
1511 * override any possibly mtu value set by ip_output.
1513 mtu = ip_ipsec_mtu(mcopy, mtu);
1516 * If the MTU was set before make sure we are below the
1518 * If the MTU wasn't set before use the interface mtu or
1519 * fall back to the next smaller mtu step compared to the
1520 * current packet size.
1524 mtu = min(mtu, ia->ia_ifp->if_mtu);
1527 mtu = ia->ia_ifp->if_mtu;
1529 mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
1531 IPSTAT_INC(ips_cantfrag);
1536 * A router should not generate ICMP_SOURCEQUENCH as
1537 * required in RFC1812 Requirements for IP Version 4 Routers.
1538 * Source quench could be a big problem under DoS attacks,
1539 * or if the underlying interface is rate-limited.
1540 * Those who need source quench packets may re-enable them
1541 * via the net.inet.ip.sendsourcequench sysctl.
1543 if (V_ip_sendsourcequench == 0) {
1546 ifa_free(&ia->ia_ifa);
1549 type = ICMP_SOURCEQUENCH;
1554 case EACCES: /* ipfw denied packet */
1557 ifa_free(&ia->ia_ifa);
1561 ifa_free(&ia->ia_ifa);
1562 icmp_error(mcopy, type, code, dest.s_addr, mtu);
1566 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1570 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) {
1574 if (inp->inp_socket->so_options & SO_BINTIME) {
1575 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt),
1576 SCM_BINTIME, SOL_SOCKET);
1578 mp = &(*mp)->m_next;
1580 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1583 bintime2timeval(&bt, &tv);
1584 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1585 SCM_TIMESTAMP, SOL_SOCKET);
1587 mp = &(*mp)->m_next;
1590 if (inp->inp_flags & INP_RECVDSTADDR) {
1591 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst,
1592 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1594 mp = &(*mp)->m_next;
1596 if (inp->inp_flags & INP_RECVTTL) {
1597 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl,
1598 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
1600 mp = &(*mp)->m_next;
1604 * Moving these out of udp_input() made them even more broken
1605 * than they already were.
1607 /* options were tossed already */
1608 if (inp->inp_flags & INP_RECVOPTS) {
1609 *mp = sbcreatecontrol((caddr_t)opts_deleted_above,
1610 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1612 mp = &(*mp)->m_next;
1614 /* ip_srcroute doesn't do what we want here, need to fix */
1615 if (inp->inp_flags & INP_RECVRETOPTS) {
1616 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m),
1617 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1619 mp = &(*mp)->m_next;
1622 if (inp->inp_flags & INP_RECVIF) {
1625 struct sockaddr_dl sdl;
1628 struct sockaddr_dl *sdp;
1629 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
1631 if ((ifp = m->m_pkthdr.rcvif) &&
1632 ifp->if_index && ifp->if_index <= V_if_index) {
1633 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
1635 * Change our mind and don't try copy.
1637 if (sdp->sdl_family != AF_LINK ||
1638 sdp->sdl_len > sizeof(sdlbuf)) {
1641 bcopy(sdp, sdl2, sdp->sdl_len);
1645 offsetof(struct sockaddr_dl, sdl_data[0]);
1646 sdl2->sdl_family = AF_LINK;
1647 sdl2->sdl_index = 0;
1648 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
1650 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len,
1651 IP_RECVIF, IPPROTO_IP);
1653 mp = &(*mp)->m_next;
1655 if (inp->inp_flags & INP_RECVTOS) {
1656 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos,
1657 sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
1659 mp = &(*mp)->m_next;
1664 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
1665 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
1666 * locking. This code remains in ip_input.c as ip_mroute.c is optionally
1669 static VNET_DEFINE(int, ip_rsvp_on);
1670 VNET_DEFINE(struct socket *, ip_rsvpd);
1672 #define V_ip_rsvp_on VNET(ip_rsvp_on)
1675 ip_rsvp_init(struct socket *so)
1678 if (so->so_type != SOCK_RAW ||
1679 so->so_proto->pr_protocol != IPPROTO_RSVP)
1682 if (V_ip_rsvpd != NULL)
1687 * This may seem silly, but we need to be sure we don't over-increment
1688 * the RSVP counter, in case something slips up.
1690 if (!V_ip_rsvp_on) {
1704 * This may seem silly, but we need to be sure we don't over-decrement
1705 * the RSVP counter, in case something slips up.
1715 rsvp_input(struct mbuf *m, int off) /* XXX must fixup manually */
1718 if (rsvp_input_p) { /* call the real one if loaded */
1719 rsvp_input_p(m, off);
1723 /* Can still get packets with rsvp_on = 0 if there is a local member
1724 * of the group to which the RSVP packet is addressed. But in this
1725 * case we want to throw the packet away.
1733 if (V_ip_rsvpd != NULL) {
1737 /* Drop the packet */