2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
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.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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>
43 #include <sys/callout.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>
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>
64 #include <net/flowtable.h>
66 #include <netinet/in.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 VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
106 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW,
107 &VNET_NAME(ip_defttl), 0,
108 "Maximum TTL on IP packets");
110 static VNET_DEFINE(int, ip_keepfaith);
111 #define V_ip_keepfaith VNET(ip_keepfaith)
112 SYSCTL_VNET_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
113 &VNET_NAME(ip_keepfaith), 0,
114 "Enable packet capture for FAITH IPv4->IPv6 translater daemon");
116 static VNET_DEFINE(int, ip_sendsourcequench);
117 #define V_ip_sendsourcequench VNET(ip_sendsourcequench)
118 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW,
119 &VNET_NAME(ip_sendsourcequench), 0,
120 "Enable the transmission of source quench packets");
122 VNET_DEFINE(int, ip_do_randomid);
123 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW,
124 &VNET_NAME(ip_do_randomid), 0,
125 "Assign random ip_id values");
128 * XXX - Setting ip_checkinterface mostly implements the receive side of
129 * the Strong ES model described in RFC 1122, but since the routing table
130 * and transmit implementation do not implement the Strong ES model,
131 * setting this to 1 results in an odd hybrid.
133 * XXX - ip_checkinterface currently must be disabled if you use ipnat
134 * to translate the destination address to another local interface.
136 * XXX - ip_checkinterface must be disabled if you add IP aliases
137 * to the loopback interface instead of the interface where the
138 * packets for those addresses are received.
140 static VNET_DEFINE(int, ip_checkinterface);
141 #define V_ip_checkinterface VNET(ip_checkinterface)
142 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW,
143 &VNET_NAME(ip_checkinterface), 0,
144 "Verify packet arrives on correct interface");
146 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */
148 static struct netisr_handler ip_nh = {
150 .nh_handler = ip_input,
151 .nh_proto = NETISR_IP,
152 .nh_policy = NETISR_POLICY_FLOW,
155 extern struct domain inetdomain;
156 extern struct protosw inetsw[];
157 u_char ip_protox[IPPROTO_MAX];
158 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
159 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
160 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
162 VNET_DEFINE(struct ipstat, ipstat);
163 SYSCTL_VNET_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RW,
164 &VNET_NAME(ipstat), ipstat,
165 "IP statistics (struct ipstat, netinet/ip_var.h)");
167 static VNET_DEFINE(uma_zone_t, ipq_zone);
168 static VNET_DEFINE(TAILQ_HEAD(ipqhead, ipq), ipq[IPREASS_NHASH]);
169 static struct mtx ipqlock;
171 #define V_ipq_zone VNET(ipq_zone)
172 #define V_ipq VNET(ipq)
174 #define IPQ_LOCK() mtx_lock(&ipqlock)
175 #define IPQ_UNLOCK() mtx_unlock(&ipqlock)
176 #define IPQ_LOCK_INIT() mtx_init(&ipqlock, "ipqlock", NULL, MTX_DEF)
177 #define IPQ_LOCK_ASSERT() mtx_assert(&ipqlock, MA_OWNED)
179 static void maxnipq_update(void);
180 static void ipq_zone_change(void *);
181 static void ip_drain_locked(void);
183 static VNET_DEFINE(int, maxnipq); /* Administrative limit on # reass queues. */
184 static VNET_DEFINE(int, nipq); /* Total # of reass queues */
185 #define V_maxnipq VNET(maxnipq)
186 #define V_nipq VNET(nipq)
187 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD,
189 "Current number of IPv4 fragment reassembly queue entries");
191 static VNET_DEFINE(int, maxfragsperpacket);
192 #define V_maxfragsperpacket VNET(maxfragsperpacket)
193 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLFLAG_RW,
194 &VNET_NAME(maxfragsperpacket), 0,
195 "Maximum number of IPv4 fragments allowed per packet");
197 struct callout ipport_tick_callout;
200 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
201 &ip_mtu, 0, "Default MTU");
205 VNET_DEFINE(int, ipstealth);
206 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW,
207 &VNET_NAME(ipstealth), 0,
208 "IP stealth mode, no TTL decrementation on forwarding");
212 static VNET_DEFINE(int, ip_output_flowtable_size) = 2048;
213 VNET_DEFINE(struct flowtable *, ip_ft);
214 #define V_ip_output_flowtable_size VNET(ip_output_flowtable_size)
216 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, output_flowtable_size, CTLFLAG_RDTUN,
217 &VNET_NAME(ip_output_flowtable_size), 2048,
218 "number of entries in the per-cpu output flow caches");
221 VNET_DEFINE(int, fw_one_pass) = 1;
223 static void ip_freef(struct ipqhead *, struct ipq *);
226 * Kernel module interface for updating ipstat. The argument is an index
227 * into ipstat treated as an array of u_long. While this encodes the general
228 * layout of ipstat into the caller, it doesn't encode its location, so that
229 * future changes to add, for example, per-CPU stats support won't cause
230 * binary compatibility problems for kernel modules.
233 kmod_ipstat_inc(int statnum)
236 (*((u_long *)&V_ipstat + statnum))++;
240 kmod_ipstat_dec(int statnum)
243 (*((u_long *)&V_ipstat + statnum))--;
247 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
251 netisr_getqlimit(&ip_nh, &qlimit);
252 error = sysctl_handle_int(oidp, &qlimit, 0, req);
253 if (error || !req->newptr)
257 return (netisr_setqlimit(&ip_nh, qlimit));
259 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
260 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I",
261 "Maximum size of the IP input queue");
264 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
266 u_int64_t qdrops_long;
269 netisr_getqdrops(&ip_nh, &qdrops_long);
270 qdrops = qdrops_long;
271 error = sysctl_handle_int(oidp, &qdrops, 0, req);
272 if (error || !req->newptr)
276 netisr_clearqdrops(&ip_nh);
280 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
281 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I",
282 "Number of packets dropped from the IP input queue");
285 * IP initialization: fill in IP protocol switch table.
286 * All protocols not implemented in kernel go to raw IP protocol handler.
294 V_ip_id = time_second & 0xffff;
296 TAILQ_INIT(&V_in_ifaddrhead);
297 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
299 /* Initialize IP reassembly queue. */
300 for (i = 0; i < IPREASS_NHASH; i++)
301 TAILQ_INIT(&V_ipq[i]);
302 V_maxnipq = nmbclusters / 32;
303 V_maxfragsperpacket = 16;
304 V_ipq_zone = uma_zcreate("ipq", sizeof(struct ipq), NULL, NULL, NULL,
305 NULL, UMA_ALIGN_PTR, 0);
308 /* Initialize packet filter hooks. */
309 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF;
310 V_inet_pfil_hook.ph_af = AF_INET;
311 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0)
312 printf("%s: WARNING: unable to register pfil hook, "
313 "error %d\n", __func__, i);
316 if (TUNABLE_INT_FETCH("net.inet.ip.output_flowtable_size",
317 &V_ip_output_flowtable_size)) {
318 if (V_ip_output_flowtable_size < 256)
319 V_ip_output_flowtable_size = 256;
320 if (!powerof2(V_ip_output_flowtable_size)) {
321 printf("flowtable must be power of 2 size\n");
322 V_ip_output_flowtable_size = 2048;
326 * round up to the next power of 2
328 V_ip_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1);
330 V_ip_ft = flowtable_alloc("ipv4", V_ip_output_flowtable_size, FL_PCPU);
333 /* Skip initialization of globals for non-default instances. */
334 if (!IS_DEFAULT_VNET(curvnet))
337 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
339 panic("ip_init: PF_INET not found");
341 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
342 for (i = 0; i < IPPROTO_MAX; i++)
343 ip_protox[i] = pr - inetsw;
345 * Cycle through IP protocols and put them into the appropriate place
348 for (pr = inetdomain.dom_protosw;
349 pr < inetdomain.dom_protoswNPROTOSW; pr++)
350 if (pr->pr_domain->dom_family == PF_INET &&
351 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
352 /* Be careful to only index valid IP protocols. */
353 if (pr->pr_protocol < IPPROTO_MAX)
354 ip_protox[pr->pr_protocol] = pr - inetsw;
357 /* Start ipport_tick. */
358 callout_init(&ipport_tick_callout, CALLOUT_MPSAFE);
359 callout_reset(&ipport_tick_callout, 1, ipport_tick, NULL);
360 EVENTHANDLER_REGISTER(shutdown_pre_sync, ip_fini, NULL,
361 SHUTDOWN_PRI_DEFAULT);
362 EVENTHANDLER_REGISTER(nmbclusters_change, ipq_zone_change,
363 NULL, EVENTHANDLER_PRI_ANY);
365 /* Initialize various other remaining things. */
367 netisr_register(&ip_nh);
375 /* Cleanup in_ifaddr hash table; should be empty. */
376 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
382 uma_zdestroy(V_ipq_zone);
390 callout_stop(&ipport_tick_callout);
394 * Ip input routine. Checksum and byte swap header. If fragmented
395 * try to reassemble. Process options. Pass to next level.
398 ip_input(struct mbuf *m)
400 struct ip *ip = NULL;
401 struct in_ifaddr *ia = NULL;
404 int checkif, hlen = 0;
406 int dchg = 0; /* dest changed after fw */
407 struct in_addr odst; /* original dst address */
411 if (m->m_flags & M_FASTFWD_OURS) {
413 * Firewall or NAT changed destination to local.
414 * We expect ip_len and ip_off to be in host byte order.
416 m->m_flags &= ~M_FASTFWD_OURS;
417 /* Set up some basics that will be used later. */
418 ip = mtod(m, struct ip *);
419 hlen = ip->ip_hl << 2;
423 IPSTAT_INC(ips_total);
425 if (m->m_pkthdr.len < sizeof(struct ip))
428 if (m->m_len < sizeof (struct ip) &&
429 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
430 IPSTAT_INC(ips_toosmall);
433 ip = mtod(m, struct ip *);
435 if (ip->ip_v != IPVERSION) {
436 IPSTAT_INC(ips_badvers);
440 hlen = ip->ip_hl << 2;
441 if (hlen < sizeof(struct ip)) { /* minimum header length */
442 IPSTAT_INC(ips_badhlen);
445 if (hlen > m->m_len) {
446 if ((m = m_pullup(m, hlen)) == NULL) {
447 IPSTAT_INC(ips_badhlen);
450 ip = mtod(m, struct ip *);
453 /* 127/8 must not appear on wire - RFC1122 */
454 ifp = m->m_pkthdr.rcvif;
455 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
456 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
457 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
458 IPSTAT_INC(ips_badaddr);
463 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
464 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
466 if (hlen == sizeof(struct ip)) {
467 sum = in_cksum_hdr(ip);
469 sum = in_cksum(m, hlen);
473 IPSTAT_INC(ips_badsum);
478 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
479 /* packet is dropped by traffic conditioner */
484 * Convert fields to host representation.
486 ip->ip_len = ntohs(ip->ip_len);
487 if (ip->ip_len < hlen) {
488 IPSTAT_INC(ips_badlen);
491 ip->ip_off = ntohs(ip->ip_off);
494 * Check that the amount of data in the buffers
495 * is as at least much as the IP header would have us expect.
496 * Trim mbufs if longer than we expect.
497 * Drop packet if shorter than we expect.
499 if (m->m_pkthdr.len < ip->ip_len) {
501 IPSTAT_INC(ips_tooshort);
504 if (m->m_pkthdr.len > ip->ip_len) {
505 if (m->m_len == m->m_pkthdr.len) {
506 m->m_len = ip->ip_len;
507 m->m_pkthdr.len = ip->ip_len;
509 m_adj(m, ip->ip_len - m->m_pkthdr.len);
513 * Bypass packet filtering for packets previously handled by IPsec.
515 if (ip_ipsec_filtertunnel(m))
520 * Run through list of hooks for input packets.
522 * NB: Beware of the destination address changing (e.g.
523 * by NAT rewriting). When this happens, tell
524 * ip_forward to do the right thing.
527 /* Jump over all PFIL processing if hooks are not active. */
528 if (!PFIL_HOOKED(&V_inet_pfil_hook))
532 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0)
534 if (m == NULL) /* consumed by filter */
537 ip = mtod(m, struct ip *);
538 dchg = (odst.s_addr != ip->ip_dst.s_addr);
539 ifp = m->m_pkthdr.rcvif;
541 #ifdef IPFIREWALL_FORWARD
542 if (m->m_flags & M_FASTFWD_OURS) {
543 m->m_flags &= ~M_FASTFWD_OURS;
546 if ((dchg = (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL)) != 0) {
548 * Directly ship the packet on. This allows forwarding
549 * packets originally destined to us to some other directly
555 #endif /* IPFIREWALL_FORWARD */
559 * Process options and, if not destined for us,
560 * ship it on. ip_dooptions returns 1 when an
561 * error was detected (causing an icmp message
562 * to be sent and the original packet to be freed).
564 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
567 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
568 * matter if it is destined to another node, or whether it is
569 * a multicast one, RSVP wants it! and prevents it from being forwarded
570 * anywhere else. Also checks if the rsvp daemon is running before
571 * grabbing the packet.
573 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
577 * Check our list of addresses, to see if the packet is for us.
578 * If we don't have any addresses, assume any unicast packet
579 * we receive might be for us (and let the upper layers deal
582 if (TAILQ_EMPTY(&V_in_ifaddrhead) &&
583 (m->m_flags & (M_MCAST|M_BCAST)) == 0)
587 * Enable a consistency check between the destination address
588 * and the arrival interface for a unicast packet (the RFC 1122
589 * strong ES model) if IP forwarding is disabled and the packet
590 * is not locally generated and the packet is not subject to
593 * XXX - Checking also should be disabled if the destination
594 * address is ipnat'ed to a different interface.
596 * XXX - Checking is incompatible with IP aliases added
597 * to the loopback interface instead of the interface where
598 * the packets are received.
600 * XXX - This is the case for carp vhost IPs as well so we
601 * insert a workaround. If the packet got here, we already
602 * checked with carp_iamatch() and carp_forus().
604 checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
605 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
606 ifp->if_carp == NULL && (dchg == 0);
609 * Check for exact addresses in the hash bucket.
611 /* IN_IFADDR_RLOCK(); */
612 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
614 * If the address matches, verify that the packet
615 * arrived via the correct interface if checking is
618 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
619 (!checkif || ia->ia_ifp == ifp)) {
620 ifa_ref(&ia->ia_ifa);
621 /* IN_IFADDR_RUNLOCK(); */
625 /* IN_IFADDR_RUNLOCK(); */
628 * Check for broadcast addresses.
630 * Only accept broadcast packets that arrive via the matching
631 * interface. Reception of forwarded directed broadcasts would
632 * be handled via ip_forward() and ether_output() with the loopback
633 * into the stack for SIMPLEX interfaces handled by ether_output().
635 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
637 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
638 if (ifa->ifa_addr->sa_family != AF_INET)
641 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
644 IF_ADDR_RUNLOCK(ifp);
647 if (ia->ia_netbroadcast.s_addr == ip->ip_dst.s_addr) {
649 IF_ADDR_RUNLOCK(ifp);
653 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
655 IF_ADDR_RUNLOCK(ifp);
660 IF_ADDR_RUNLOCK(ifp);
663 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
664 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
665 IPSTAT_INC(ips_cantforward);
669 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
672 * If we are acting as a multicast router, all
673 * incoming multicast packets are passed to the
674 * kernel-level multicast forwarding function.
675 * The packet is returned (relatively) intact; if
676 * ip_mforward() returns a non-zero value, the packet
677 * must be discarded, else it may be accepted below.
679 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
680 IPSTAT_INC(ips_cantforward);
686 * The process-level routing daemon needs to receive
687 * all multicast IGMP packets, whether or not this
688 * host belongs to their destination groups.
690 if (ip->ip_p == IPPROTO_IGMP)
692 IPSTAT_INC(ips_forward);
695 * Assume the packet is for us, to avoid prematurely taking
696 * a lock on the in_multi hash. Protocols must perform
697 * their own filtering and update statistics accordingly.
701 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
703 if (ip->ip_dst.s_addr == INADDR_ANY)
707 * FAITH(Firewall Aided Internet Translator)
709 if (ifp && ifp->if_type == IFT_FAITH) {
710 if (V_ip_keepfaith) {
711 if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP)
719 * Not for us; forward if possible and desirable.
721 if (V_ipforwarding == 0) {
722 IPSTAT_INC(ips_cantforward);
736 * IPSTEALTH: Process non-routing options only
737 * if the packet is destined for us.
739 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) {
741 ifa_free(&ia->ia_ifa);
744 #endif /* IPSTEALTH */
746 /* Count the packet in the ip address stats */
748 ia->ia_ifa.if_ipackets++;
749 ia->ia_ifa.if_ibytes += m->m_pkthdr.len;
750 ifa_free(&ia->ia_ifa);
754 * Attempt reassembly; if it succeeds, proceed.
755 * ip_reass() will return a different mbuf.
757 if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
761 ip = mtod(m, struct ip *);
762 /* Get the header length of the reassembled packet */
763 hlen = ip->ip_hl << 2;
767 * Further protocols expect the packet length to be w/o the
774 * enforce IPsec policy checking if we are seeing last header.
775 * note that we do not visit this with protocols with pcb layer
776 * code - like udp/tcp/raw ip.
778 if (ip_ipsec_input(m))
783 * Switch out to protocol's input routine.
785 IPSTAT_INC(ips_delivered);
787 (*inetsw[ip_protox[ip->ip_p]].pr_input)(m, hlen);
794 * After maxnipq has been updated, propagate the change to UMA. The UMA zone
795 * max has slightly different semantics than the sysctl, for historical
803 * -1 for unlimited allocation.
806 uma_zone_set_max(V_ipq_zone, 0);
808 * Positive number for specific bound.
811 uma_zone_set_max(V_ipq_zone, V_maxnipq);
813 * Zero specifies no further fragment queue allocation -- set the
814 * bound very low, but rely on implementation elsewhere to actually
815 * prevent allocation and reclaim current queues.
818 uma_zone_set_max(V_ipq_zone, 1);
822 ipq_zone_change(void *tag)
825 if (V_maxnipq > 0 && V_maxnipq < (nmbclusters / 32)) {
826 V_maxnipq = nmbclusters / 32;
832 sysctl_maxnipq(SYSCTL_HANDLER_ARGS)
837 error = sysctl_handle_int(oidp, &i, 0, req);
838 if (error || !req->newptr)
842 * XXXRW: Might be a good idea to sanity check the argument and place
843 * an extreme upper bound.
852 SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragpackets, CTLTYPE_INT|CTLFLAG_RW,
853 NULL, 0, sysctl_maxnipq, "I",
854 "Maximum number of IPv4 fragment reassembly queue entries");
857 * Take incoming datagram fragment and try to reassemble it into
858 * whole datagram. If the argument is the first fragment or one
859 * in between the function will return NULL and store the mbuf
860 * in the fragment chain. If the argument is the last fragment
861 * the packet will be reassembled and the pointer to the new
862 * mbuf returned for further processing. Only m_tags attached
863 * to the first packet/fragment are preserved.
864 * The IP header is *NOT* adjusted out of iplen.
867 ip_reass(struct mbuf *m)
870 struct mbuf *p, *q, *nq, *t;
871 struct ipq *fp = NULL;
872 struct ipqhead *head;
877 /* If maxnipq or maxfragsperpacket are 0, never accept fragments. */
878 if (V_maxnipq == 0 || V_maxfragsperpacket == 0) {
879 IPSTAT_INC(ips_fragments);
880 IPSTAT_INC(ips_fragdropped);
885 ip = mtod(m, struct ip *);
886 hlen = ip->ip_hl << 2;
888 hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
893 * Look for queue of fragments
896 TAILQ_FOREACH(fp, head, ipq_list)
897 if (ip->ip_id == fp->ipq_id &&
898 ip->ip_src.s_addr == fp->ipq_src.s_addr &&
899 ip->ip_dst.s_addr == fp->ipq_dst.s_addr &&
901 mac_ipq_match(m, fp) &&
903 ip->ip_p == fp->ipq_p)
909 * Attempt to trim the number of allocated fragment queues if it
910 * exceeds the administrative limit.
912 if ((V_nipq > V_maxnipq) && (V_maxnipq > 0)) {
914 * drop something from the tail of the current queue
915 * before proceeding further
917 struct ipq *q = TAILQ_LAST(head, ipqhead);
918 if (q == NULL) { /* gak */
919 for (i = 0; i < IPREASS_NHASH; i++) {
920 struct ipq *r = TAILQ_LAST(&V_ipq[i], ipqhead);
922 IPSTAT_ADD(ips_fragtimeout,
924 ip_freef(&V_ipq[i], r);
929 IPSTAT_ADD(ips_fragtimeout, q->ipq_nfrags);
936 * Adjust ip_len to not reflect header,
937 * convert offset of this to bytes.
940 if (ip->ip_off & IP_MF) {
942 * Make sure that fragments have a data length
943 * that's a non-zero multiple of 8 bytes.
945 if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) {
946 IPSTAT_INC(ips_toosmall); /* XXX */
949 m->m_flags |= M_FRAG;
951 m->m_flags &= ~M_FRAG;
956 * Attempt reassembly; if it succeeds, proceed.
957 * ip_reass() will return a different mbuf.
959 IPSTAT_INC(ips_fragments);
960 m->m_pkthdr.header = ip;
962 /* Previous ip_reass() started here. */
964 * Presence of header sizes in mbufs
965 * would confuse code below.
971 * If first fragment to arrive, create a reassembly queue.
974 fp = uma_zalloc(V_ipq_zone, M_NOWAIT);
978 if (mac_ipq_init(fp, M_NOWAIT) != 0) {
979 uma_zfree(V_ipq_zone, fp);
983 mac_ipq_create(m, fp);
985 TAILQ_INSERT_HEAD(head, fp, ipq_list);
988 fp->ipq_ttl = IPFRAGTTL;
989 fp->ipq_p = ip->ip_p;
990 fp->ipq_id = ip->ip_id;
991 fp->ipq_src = ip->ip_src;
992 fp->ipq_dst = ip->ip_dst;
999 mac_ipq_update(m, fp);
1003 #define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
1006 * Handle ECN by comparing this segment with the first one;
1007 * if CE is set, do not lose CE.
1008 * drop if CE and not-ECT are mixed for the same packet.
1010 ecn = ip->ip_tos & IPTOS_ECN_MASK;
1011 ecn0 = GETIP(fp->ipq_frags)->ip_tos & IPTOS_ECN_MASK;
1012 if (ecn == IPTOS_ECN_CE) {
1013 if (ecn0 == IPTOS_ECN_NOTECT)
1015 if (ecn0 != IPTOS_ECN_CE)
1016 GETIP(fp->ipq_frags)->ip_tos |= IPTOS_ECN_CE;
1018 if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT)
1022 * Find a segment which begins after this one does.
1024 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt)
1025 if (GETIP(q)->ip_off > ip->ip_off)
1029 * If there is a preceding segment, it may provide some of
1030 * our data already. If so, drop the data from the incoming
1031 * segment. If it provides all of our data, drop us, otherwise
1032 * stick new segment in the proper place.
1034 * If some of the data is dropped from the preceding
1035 * segment, then it's checksum is invalidated.
1038 i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
1040 if (i >= ip->ip_len)
1043 m->m_pkthdr.csum_flags = 0;
1047 m->m_nextpkt = p->m_nextpkt;
1050 m->m_nextpkt = fp->ipq_frags;
1055 * While we overlap succeeding segments trim them or,
1056 * if they are completely covered, dequeue them.
1058 for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off;
1060 i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off;
1061 if (i < GETIP(q)->ip_len) {
1062 GETIP(q)->ip_len -= i;
1063 GETIP(q)->ip_off += i;
1065 q->m_pkthdr.csum_flags = 0;
1070 IPSTAT_INC(ips_fragdropped);
1076 * Check for complete reassembly and perform frag per packet
1079 * Frag limiting is performed here so that the nth frag has
1080 * a chance to complete the packet before we drop the packet.
1081 * As a result, n+1 frags are actually allowed per packet, but
1082 * only n will ever be stored. (n = maxfragsperpacket.)
1086 for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
1087 if (GETIP(q)->ip_off != next) {
1088 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1089 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1094 next += GETIP(q)->ip_len;
1096 /* Make sure the last packet didn't have the IP_MF flag */
1097 if (p->m_flags & M_FRAG) {
1098 if (fp->ipq_nfrags > V_maxfragsperpacket) {
1099 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1106 * Reassembly is complete. Make sure the packet is a sane size.
1110 if (next + (ip->ip_hl << 2) > IP_MAXPACKET) {
1111 IPSTAT_INC(ips_toolong);
1112 IPSTAT_ADD(ips_fragdropped, fp->ipq_nfrags);
1118 * Concatenate fragments.
1125 q->m_nextpkt = NULL;
1126 for (q = nq; q != NULL; q = nq) {
1128 q->m_nextpkt = NULL;
1129 m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
1130 m->m_pkthdr.csum_data += q->m_pkthdr.csum_data;
1134 * In order to do checksumming faster we do 'end-around carry' here
1135 * (and not in for{} loop), though it implies we are not going to
1136 * reassemble more than 64k fragments.
1138 m->m_pkthdr.csum_data =
1139 (m->m_pkthdr.csum_data & 0xffff) + (m->m_pkthdr.csum_data >> 16);
1141 mac_ipq_reassemble(fp, m);
1142 mac_ipq_destroy(fp);
1146 * Create header for new ip packet by modifying header of first
1147 * packet; dequeue and discard fragment reassembly header.
1148 * Make header visible.
1150 ip->ip_len = (ip->ip_hl << 2) + next;
1151 ip->ip_src = fp->ipq_src;
1152 ip->ip_dst = fp->ipq_dst;
1153 TAILQ_REMOVE(head, fp, ipq_list);
1155 uma_zfree(V_ipq_zone, fp);
1156 m->m_len += (ip->ip_hl << 2);
1157 m->m_data -= (ip->ip_hl << 2);
1158 /* some debugging cruft by sklower, below, will go away soon */
1159 if (m->m_flags & M_PKTHDR) /* XXX this should be done elsewhere */
1161 IPSTAT_INC(ips_reassembled);
1166 IPSTAT_INC(ips_fragdropped);
1178 * Free a fragment reassembly header and all
1179 * associated datagrams.
1182 ip_freef(struct ipqhead *fhp, struct ipq *fp)
1188 while (fp->ipq_frags) {
1190 fp->ipq_frags = q->m_nextpkt;
1193 TAILQ_REMOVE(fhp, fp, ipq_list);
1194 uma_zfree(V_ipq_zone, fp);
1199 * IP timer processing;
1200 * if a timer expires on a reassembly
1201 * queue, discard it.
1206 VNET_ITERATOR_DECL(vnet_iter);
1210 VNET_LIST_RLOCK_NOSLEEP();
1212 VNET_FOREACH(vnet_iter) {
1213 CURVNET_SET(vnet_iter);
1214 for (i = 0; i < IPREASS_NHASH; i++) {
1215 for(fp = TAILQ_FIRST(&V_ipq[i]); fp;) {
1219 fp = TAILQ_NEXT(fp, ipq_list);
1220 if(--fpp->ipq_ttl == 0) {
1221 IPSTAT_ADD(ips_fragtimeout,
1223 ip_freef(&V_ipq[i], fpp);
1228 * If we are over the maximum number of fragments
1229 * (due to the limit being lowered), drain off
1230 * enough to get down to the new limit.
1232 if (V_maxnipq >= 0 && V_nipq > V_maxnipq) {
1233 for (i = 0; i < IPREASS_NHASH; i++) {
1234 while (V_nipq > V_maxnipq &&
1235 !TAILQ_EMPTY(&V_ipq[i])) {
1236 IPSTAT_ADD(ips_fragdropped,
1237 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1239 TAILQ_FIRST(&V_ipq[i]));
1246 VNET_LIST_RUNLOCK_NOSLEEP();
1250 * Drain off all datagram fragments.
1253 ip_drain_locked(void)
1259 for (i = 0; i < IPREASS_NHASH; i++) {
1260 while(!TAILQ_EMPTY(&V_ipq[i])) {
1261 IPSTAT_ADD(ips_fragdropped,
1262 TAILQ_FIRST(&V_ipq[i])->ipq_nfrags);
1263 ip_freef(&V_ipq[i], TAILQ_FIRST(&V_ipq[i]));
1271 VNET_ITERATOR_DECL(vnet_iter);
1273 VNET_LIST_RLOCK_NOSLEEP();
1275 VNET_FOREACH(vnet_iter) {
1276 CURVNET_SET(vnet_iter);
1281 VNET_LIST_RUNLOCK_NOSLEEP();
1286 * The protocol to be inserted into ip_protox[] must be already registered
1287 * in inetsw[], either statically or through pf_proto_register().
1290 ipproto_register(short ipproto)
1294 /* Sanity checks. */
1295 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1296 return (EPROTONOSUPPORT);
1299 * The protocol slot must not be occupied by another protocol
1300 * already. An index pointing to IPPROTO_RAW is unused.
1302 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1304 return (EPFNOSUPPORT);
1305 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */
1308 /* Find the protocol position in inetsw[] and set the index. */
1309 for (pr = inetdomain.dom_protosw;
1310 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
1311 if (pr->pr_domain->dom_family == PF_INET &&
1312 pr->pr_protocol && pr->pr_protocol == ipproto) {
1313 ip_protox[pr->pr_protocol] = pr - inetsw;
1317 return (EPROTONOSUPPORT);
1321 ipproto_unregister(short ipproto)
1325 /* Sanity checks. */
1326 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
1327 return (EPROTONOSUPPORT);
1329 /* Check if the protocol was indeed registered. */
1330 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
1332 return (EPFNOSUPPORT);
1333 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */
1336 /* Reset the protocol slot to IPPROTO_RAW. */
1337 ip_protox[ipproto] = pr - inetsw;
1342 * Given address of next destination (final or next hop), return (referenced)
1343 * internet address info of interface to be used to get there.
1346 ip_rtaddr(struct in_addr dst, u_int fibnum)
1349 struct sockaddr_in *sin;
1350 struct in_ifaddr *ia;
1352 bzero(&sro, sizeof(sro));
1353 sin = (struct sockaddr_in *)&sro.ro_dst;
1354 sin->sin_family = AF_INET;
1355 sin->sin_len = sizeof(*sin);
1356 sin->sin_addr = dst;
1357 in_rtalloc_ign(&sro, 0, fibnum);
1359 if (sro.ro_rt == NULL)
1362 ia = ifatoia(sro.ro_rt->rt_ifa);
1363 ifa_ref(&ia->ia_ifa);
1368 u_char inetctlerrmap[PRC_NCMDS] = {
1370 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
1371 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
1372 EMSGSIZE, EHOSTUNREACH, 0, 0,
1373 0, 0, EHOSTUNREACH, 0,
1374 ENOPROTOOPT, ECONNREFUSED
1378 * Forward a packet. If some error occurs return the sender
1379 * an icmp packet. Note we can't always generate a meaningful
1380 * icmp message because icmp doesn't have a large enough repertoire
1381 * of codes and types.
1383 * If not forwarding, just drop the packet. This could be confusing
1384 * if ipforwarding was zero but some routing protocol was advancing
1385 * us as a gateway to somewhere. However, we must let the routing
1386 * protocol deal with that.
1388 * The srcrt parameter indicates whether the packet is being forwarded
1389 * via a source route.
1392 ip_forward(struct mbuf *m, int srcrt)
1394 struct ip *ip = mtod(m, struct ip *);
1395 struct in_ifaddr *ia;
1397 struct in_addr dest;
1399 int error, type = 0, code = 0, mtu = 0;
1401 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1402 IPSTAT_INC(ips_cantforward);
1409 if (ip->ip_ttl <= IPTTLDEC) {
1410 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS,
1418 ia = ip_rtaddr(ip->ip_dst, M_GETFIB(m));
1421 * 'ia' may be NULL if there is no route for this destination.
1422 * In case of IPsec, Don't discard it just yet, but pass it to
1423 * ip_output in case of outgoing IPsec policy.
1425 if (!srcrt && ia == NULL) {
1426 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1432 * Save the IP header and at most 8 bytes of the payload,
1433 * in case we need to generate an ICMP message to the src.
1435 * XXX this can be optimized a lot by saving the data in a local
1436 * buffer on the stack (72 bytes at most), and only allocating the
1437 * mbuf if really necessary. The vast majority of the packets
1438 * are forwarded without having to send an ICMP back (either
1439 * because unnecessary, or because rate limited), so we are
1440 * really we are wasting a lot of work here.
1442 * We don't use m_copy() because it might return a reference
1443 * to a shared cluster. Both this function and ip_output()
1444 * assume exclusive access to the IP header in `m', so any
1445 * data in a cluster may change before we reach icmp_error().
1447 MGETHDR(mcopy, M_DONTWAIT, m->m_type);
1448 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_DONTWAIT)) {
1450 * It's probably ok if the pkthdr dup fails (because
1451 * the deep copy of the tag chain failed), but for now
1452 * be conservative and just discard the copy since
1453 * code below may some day want the tags.
1458 if (mcopy != NULL) {
1459 mcopy->m_len = min(ip->ip_len, M_TRAILINGSPACE(mcopy));
1460 mcopy->m_pkthdr.len = mcopy->m_len;
1461 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1467 ip->ip_ttl -= IPTTLDEC;
1473 * If forwarding packet using same interface that it came in on,
1474 * perhaps should send a redirect to sender to shortcut a hop.
1475 * Only send redirect if source is sending directly to us,
1476 * and if packet was not source routed (or has any options).
1477 * Also, don't send redirect if forwarding using a default route
1478 * or a route modified by a redirect.
1481 if (!srcrt && V_ipsendredirects &&
1482 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
1483 struct sockaddr_in *sin;
1486 bzero(&ro, sizeof(ro));
1487 sin = (struct sockaddr_in *)&ro.ro_dst;
1488 sin->sin_family = AF_INET;
1489 sin->sin_len = sizeof(*sin);
1490 sin->sin_addr = ip->ip_dst;
1491 in_rtalloc_ign(&ro, 0, M_GETFIB(m));
1495 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1496 satosin(rt_key(rt))->sin_addr.s_addr != 0) {
1497 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa))
1498 u_long src = ntohl(ip->ip_src.s_addr);
1501 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) {
1502 if (rt->rt_flags & RTF_GATEWAY)
1503 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr;
1505 dest.s_addr = ip->ip_dst.s_addr;
1506 /* Router requirements says to only send host redirects */
1507 type = ICMP_REDIRECT;
1508 code = ICMP_REDIRECT_HOST;
1516 * Try to cache the route MTU from ip_output so we can consider it for
1517 * the ICMP_UNREACH_NEEDFRAG "Next-Hop MTU" field described in RFC1191.
1519 bzero(&ro, sizeof(ro));
1521 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
1523 if (error == EMSGSIZE && ro.ro_rt)
1524 mtu = ro.ro_rt->rt_rmx.rmx_mtu;
1529 IPSTAT_INC(ips_cantforward);
1531 IPSTAT_INC(ips_forward);
1533 IPSTAT_INC(ips_redirectsent);
1538 ifa_free(&ia->ia_ifa);
1542 if (mcopy == NULL) {
1544 ifa_free(&ia->ia_ifa);
1550 case 0: /* forwarded, but need redirect */
1551 /* type, code set above */
1559 type = ICMP_UNREACH;
1560 code = ICMP_UNREACH_HOST;
1564 type = ICMP_UNREACH;
1565 code = ICMP_UNREACH_NEEDFRAG;
1569 * If IPsec is configured for this path,
1570 * override any possibly mtu value set by ip_output.
1572 mtu = ip_ipsec_mtu(mcopy, mtu);
1575 * If the MTU was set before make sure we are below the
1577 * If the MTU wasn't set before use the interface mtu or
1578 * fall back to the next smaller mtu step compared to the
1579 * current packet size.
1583 mtu = min(mtu, ia->ia_ifp->if_mtu);
1586 mtu = ia->ia_ifp->if_mtu;
1588 mtu = ip_next_mtu(ip->ip_len, 0);
1590 IPSTAT_INC(ips_cantfrag);
1595 * A router should not generate ICMP_SOURCEQUENCH as
1596 * required in RFC1812 Requirements for IP Version 4 Routers.
1597 * Source quench could be a big problem under DoS attacks,
1598 * or if the underlying interface is rate-limited.
1599 * Those who need source quench packets may re-enable them
1600 * via the net.inet.ip.sendsourcequench sysctl.
1602 if (V_ip_sendsourcequench == 0) {
1605 ifa_free(&ia->ia_ifa);
1608 type = ICMP_SOURCEQUENCH;
1613 case EACCES: /* ipfw denied packet */
1616 ifa_free(&ia->ia_ifa);
1620 ifa_free(&ia->ia_ifa);
1621 icmp_error(mcopy, type, code, dest.s_addr, mtu);
1625 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1629 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) {
1633 if (inp->inp_socket->so_options & SO_BINTIME) {
1634 *mp = sbcreatecontrol((caddr_t) &bt, sizeof(bt),
1635 SCM_BINTIME, SOL_SOCKET);
1637 mp = &(*mp)->m_next;
1639 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1642 bintime2timeval(&bt, &tv);
1643 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
1644 SCM_TIMESTAMP, SOL_SOCKET);
1646 mp = &(*mp)->m_next;
1649 if (inp->inp_flags & INP_RECVDSTADDR) {
1650 *mp = sbcreatecontrol((caddr_t) &ip->ip_dst,
1651 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1653 mp = &(*mp)->m_next;
1655 if (inp->inp_flags & INP_RECVTTL) {
1656 *mp = sbcreatecontrol((caddr_t) &ip->ip_ttl,
1657 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
1659 mp = &(*mp)->m_next;
1663 * Moving these out of udp_input() made them even more broken
1664 * than they already were.
1666 /* options were tossed already */
1667 if (inp->inp_flags & INP_RECVOPTS) {
1668 *mp = sbcreatecontrol((caddr_t) opts_deleted_above,
1669 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1671 mp = &(*mp)->m_next;
1673 /* ip_srcroute doesn't do what we want here, need to fix */
1674 if (inp->inp_flags & INP_RECVRETOPTS) {
1675 *mp = sbcreatecontrol((caddr_t) ip_srcroute(m),
1676 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1678 mp = &(*mp)->m_next;
1681 if (inp->inp_flags & INP_RECVIF) {
1684 struct sockaddr_dl sdl;
1687 struct sockaddr_dl *sdp;
1688 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
1690 if (((ifp = m->m_pkthdr.rcvif))
1691 && ( ifp->if_index && (ifp->if_index <= V_if_index))) {
1692 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
1694 * Change our mind and don't try copy.
1696 if ((sdp->sdl_family != AF_LINK)
1697 || (sdp->sdl_len > sizeof(sdlbuf))) {
1700 bcopy(sdp, sdl2, sdp->sdl_len);
1704 = offsetof(struct sockaddr_dl, sdl_data[0]);
1705 sdl2->sdl_family = AF_LINK;
1706 sdl2->sdl_index = 0;
1707 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
1709 *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len,
1710 IP_RECVIF, IPPROTO_IP);
1712 mp = &(*mp)->m_next;
1714 if (inp->inp_flags & INP_RECVTOS) {
1715 *mp = sbcreatecontrol((caddr_t) &ip->ip_tos,
1716 sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
1718 mp = &(*mp)->m_next;
1723 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
1724 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
1725 * locking. This code remains in ip_input.c as ip_mroute.c is optionally
1728 static VNET_DEFINE(int, ip_rsvp_on);
1729 VNET_DEFINE(struct socket *, ip_rsvpd);
1731 #define V_ip_rsvp_on VNET(ip_rsvp_on)
1734 ip_rsvp_init(struct socket *so)
1737 if (so->so_type != SOCK_RAW ||
1738 so->so_proto->pr_protocol != IPPROTO_RSVP)
1741 if (V_ip_rsvpd != NULL)
1746 * This may seem silly, but we need to be sure we don't over-increment
1747 * the RSVP counter, in case something slips up.
1749 if (!V_ip_rsvp_on) {
1763 * This may seem silly, but we need to be sure we don't over-decrement
1764 * the RSVP counter, in case something slips up.
1774 rsvp_input(struct mbuf *m, int off) /* XXX must fixup manually */
1777 if (rsvp_input_p) { /* call the real one if loaded */
1778 rsvp_input_p(m, off);
1782 /* Can still get packets with rsvp_on = 0 if there is a local member
1783 * of the group to which the RSVP packet is addressed. But in this
1784 * case we want to throw the packet away.
1792 if (V_ip_rsvpd != NULL) {
1796 /* Drop the packet */