1 /*-
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/11.0/sys/netinet/ip_input.c 302054 2016-06-21 13:48:49Z bz $");
34
35 #include "opt_bootp.h"
36 #include "opt_ipstealth.h"
37 #include "opt_ipsec.h"
38 #include "opt_route.h"
39 #include "opt_rss.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/hhook.h>
44 #include <sys/mbuf.h>
45 #include <sys/malloc.h>
46 #include <sys/domain.h>
47 #include <sys/protosw.h>
48 #include <sys/socket.h>
49 #include <sys/time.h>
50 #include <sys/kernel.h>
51 #include <sys/lock.h>
52 #include <sys/rmlock.h>
53 #include <sys/rwlock.h>
54 #include <sys/sdt.h>
55 #include <sys/syslog.h>
56 #include <sys/sysctl.h>
57
58 #include <net/pfil.h>
59 #include <net/if.h>
60 #include <net/if_types.h>
61 #include <net/if_var.h>
62 #include <net/if_dl.h>
63 #include <net/route.h>
64 #include <net/netisr.h>
65 #include <net/rss_config.h>
66 #include <net/vnet.h>
67
68 #include <netinet/in.h>
69 #include <netinet/in_kdtrace.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/in_var.h>
72 #include <netinet/ip.h>
73 #include <netinet/in_pcb.h>
74 #include <netinet/ip_var.h>
75 #include <netinet/ip_fw.h>
76 #include <netinet/ip_icmp.h>
77 #include <netinet/ip_options.h>
78 #include <machine/in_cksum.h>
79 #include <netinet/ip_carp.h>
80 #ifdef IPSEC
81 #include <netinet/ip_ipsec.h>
82 #include <netipsec/ipsec.h>
83 #include <netipsec/key.h>
84 #endif /* IPSEC */
85 #include <netinet/in_rss.h>
86
87 #include <sys/socketvar.h>
88
89 #include <security/mac/mac_framework.h>
90
91 #ifdef CTASSERT
92 CTASSERT(sizeof(struct ip) == 20);
93 #endif
94
95 /* IP reassembly functions are defined in ip_reass.c. */
96 extern void ipreass_init(void);
97 extern void ipreass_drain(void);
98 extern void ipreass_slowtimo(void);
99 #ifdef VIMAGE
100 extern void ipreass_destroy(void);
101 #endif
102
103 struct rmlock in_ifaddr_lock;
104 RM_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock");
105
106 VNET_DEFINE(int, rsvp_on);
107
108 VNET_DEFINE(int, ipforwarding);
109 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW,
110 &VNET_NAME(ipforwarding), 0,
111 "Enable IP forwarding between interfaces");
112
113 static VNET_DEFINE(int, ipsendredirects) = 1; /* XXX */
114 #define V_ipsendredirects VNET(ipsendredirects)
115 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW,
116 &VNET_NAME(ipsendredirects), 0,
117 "Enable sending IP redirects");
118
119 /*
120 * XXX - Setting ip_checkinterface mostly implements the receive side of
121 * the Strong ES model described in RFC 1122, but since the routing table
122 * and transmit implementation do not implement the Strong ES model,
123 * setting this to 1 results in an odd hybrid.
124 *
125 * XXX - ip_checkinterface currently must be disabled if you use ipnat
126 * to translate the destination address to another local interface.
127 *
128 * XXX - ip_checkinterface must be disabled if you add IP aliases
129 * to the loopback interface instead of the interface where the
130 * packets for those addresses are received.
131 */
132 static VNET_DEFINE(int, ip_checkinterface);
133 #define V_ip_checkinterface VNET(ip_checkinterface)
134 SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_VNET | CTLFLAG_RW,
135 &VNET_NAME(ip_checkinterface), 0,
136 "Verify packet arrives on correct interface");
137
138 VNET_DEFINE(struct pfil_head, inet_pfil_hook); /* Packet filter hooks */
139
140 static struct netisr_handler ip_nh = {
141 .nh_name = "ip",
142 .nh_handler = ip_input,
143 .nh_proto = NETISR_IP,
144 #ifdef RSS
145 .nh_m2cpuid = rss_soft_m2cpuid_v4,
146 .nh_policy = NETISR_POLICY_CPU,
147 .nh_dispatch = NETISR_DISPATCH_HYBRID,
148 #else
149 .nh_policy = NETISR_POLICY_FLOW,
150 #endif
151 };
152
153 #ifdef RSS
154 /*
155 * Directly dispatched frames are currently assumed
156 * to have a flowid already calculated.
157 *
158 * It should likely have something that assert it
159 * actually has valid flow details.
160 */
161 static struct netisr_handler ip_direct_nh = {
162 .nh_name = "ip_direct",
163 .nh_handler = ip_direct_input,
164 .nh_proto = NETISR_IP_DIRECT,
165 .nh_m2cpuid = rss_soft_m2cpuid_v4,
166 .nh_policy = NETISR_POLICY_CPU,
167 .nh_dispatch = NETISR_DISPATCH_HYBRID,
168 };
169 #endif
170
171 extern struct domain inetdomain;
172 extern struct protosw inetsw[];
173 u_char ip_protox[IPPROTO_MAX];
174 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
175 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
176 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
177
178 #ifdef IPCTL_DEFMTU
179 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
180 &ip_mtu, 0, "Default MTU");
181 #endif
182
183 #ifdef IPSTEALTH
184 VNET_DEFINE(int, ipstealth);
185 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW,
186 &VNET_NAME(ipstealth), 0,
187 "IP stealth mode, no TTL decrementation on forwarding");
188 #endif
189
190 /*
191 * IP statistics are stored in the "array" of counter(9)s.
192 */
193 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat);
194 VNET_PCPUSTAT_SYSINIT(ipstat);
195 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat,
196 "IP statistics (struct ipstat, netinet/ip_var.h)");
197
198 #ifdef VIMAGE
199 VNET_PCPUSTAT_SYSUNINIT(ipstat);
200 #endif /* VIMAGE */
201
202 /*
203 * Kernel module interface for updating ipstat. The argument is an index
204 * into ipstat treated as an array.
205 */
206 void
207 kmod_ipstat_inc(int statnum)
208 {
209
210 counter_u64_add(VNET(ipstat)[statnum], 1);
211 }
212
213 void
214 kmod_ipstat_dec(int statnum)
215 {
216
217 counter_u64_add(VNET(ipstat)[statnum], -1);
218 }
219
220 static int
221 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
222 {
223 int error, qlimit;
224
225 netisr_getqlimit(&ip_nh, &qlimit);
226 error = sysctl_handle_int(oidp, &qlimit, 0, req);
227 if (error || !req->newptr)
228 return (error);
229 if (qlimit < 1)
230 return (EINVAL);
231 return (netisr_setqlimit(&ip_nh, qlimit));
232 }
233 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
234 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_queue_maxlen, "I",
235 "Maximum size of the IP input queue");
236
237 static int
238 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
239 {
240 u_int64_t qdrops_long;
241 int error, qdrops;
242
243 netisr_getqdrops(&ip_nh, &qdrops_long);
244 qdrops = qdrops_long;
245 error = sysctl_handle_int(oidp, &qdrops, 0, req);
246 if (error || !req->newptr)
247 return (error);
248 if (qdrops != 0)
249 return (EINVAL);
250 netisr_clearqdrops(&ip_nh);
251 return (0);
252 }
253
254 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
255 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_queue_drops, "I",
256 "Number of packets dropped from the IP input queue");
257
258 #ifdef RSS
259 static int
260 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
261 {
262 int error, qlimit;
263
264 netisr_getqlimit(&ip_direct_nh, &qlimit);
265 error = sysctl_handle_int(oidp, &qlimit, 0, req);
266 if (error || !req->newptr)
267 return (error);
268 if (qlimit < 1)
269 return (EINVAL);
270 return (netisr_setqlimit(&ip_direct_nh, qlimit));
271 }
272 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_direct_queue_maxlen,
273 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet_intr_direct_queue_maxlen, "I",
274 "Maximum size of the IP direct input queue");
275
276 static int
277 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS)
278 {
279 u_int64_t qdrops_long;
280 int error, qdrops;
281
282 netisr_getqdrops(&ip_direct_nh, &qdrops_long);
283 qdrops = qdrops_long;
284 error = sysctl_handle_int(oidp, &qdrops, 0, req);
285 if (error || !req->newptr)
286 return (error);
287 if (qdrops != 0)
288 return (EINVAL);
289 netisr_clearqdrops(&ip_direct_nh);
290 return (0);
291 }
292
293 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_direct_queue_drops,
294 CTLTYPE_INT|CTLFLAG_RD, 0, 0, sysctl_netinet_intr_direct_queue_drops, "I",
295 "Number of packets dropped from the IP direct input queue");
296 #endif /* RSS */
297
298 /*
299 * IP initialization: fill in IP protocol switch table.
300 * All protocols not implemented in kernel go to raw IP protocol handler.
301 */
302 void
303 ip_init(void)
304 {
305 struct protosw *pr;
306 int i;
307
308 TAILQ_INIT(&V_in_ifaddrhead);
309 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
310
311 /* Initialize IP reassembly queue. */
312 ipreass_init();
313
314 /* Initialize packet filter hooks. */
315 V_inet_pfil_hook.ph_type = PFIL_TYPE_AF;
316 V_inet_pfil_hook.ph_af = AF_INET;
317 if ((i = pfil_head_register(&V_inet_pfil_hook)) != 0)
318 printf("%s: WARNING: unable to register pfil hook, "
319 "error %d\n", __func__, i);
320
321 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET,
322 &V_ipsec_hhh_in[HHOOK_IPSEC_INET],
323 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
324 printf("%s: WARNING: unable to register input helper hook\n",
325 __func__);
326 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET,
327 &V_ipsec_hhh_out[HHOOK_IPSEC_INET],
328 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
329 printf("%s: WARNING: unable to register output helper hook\n",
330 __func__);
331
332 /* Skip initialization of globals for non-default instances. */
333 #ifdef VIMAGE
334 if (!IS_DEFAULT_VNET(curvnet)) {
335 netisr_register_vnet(&ip_nh);
336 #ifdef RSS
337 netisr_register_vnet(&ip_direct_nh);
338 #endif
339 return;
340 }
341 #endif
342
343 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
344 if (pr == NULL)
345 panic("ip_init: PF_INET not found");
346
347 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
348 for (i = 0; i < IPPROTO_MAX; i++)
349 ip_protox[i] = pr - inetsw;
350 /*
351 * Cycle through IP protocols and put them into the appropriate place
352 * in ip_protox[].
353 */
354 for (pr = inetdomain.dom_protosw;
355 pr < inetdomain.dom_protoswNPROTOSW; pr++)
356 if (pr->pr_domain->dom_family == PF_INET &&
357 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
358 /* Be careful to only index valid IP protocols. */
359 if (pr->pr_protocol < IPPROTO_MAX)
360 ip_protox[pr->pr_protocol] = pr - inetsw;
361 }
362
363 netisr_register(&ip_nh);
364 #ifdef RSS
365 netisr_register(&ip_direct_nh);
366 #endif
367 }
368
369 #ifdef VIMAGE
370 static void
371 ip_destroy(void *unused __unused)
372 {
373 struct ifnet *ifp;
374 int error;
375
376 #ifdef RSS
377 netisr_unregister_vnet(&ip_direct_nh);
378 #endif
379 netisr_unregister_vnet(&ip_nh);
380
381 if ((error = pfil_head_unregister(&V_inet_pfil_hook)) != 0)
382 printf("%s: WARNING: unable to unregister pfil hook, "
383 "error %d\n", __func__, error);
384
385 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]);
386 if (error != 0) {
387 printf("%s: WARNING: unable to deregister input helper hook "
388 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: "
389 "error %d returned\n", __func__, error);
390 }
391 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]);
392 if (error != 0) {
393 printf("%s: WARNING: unable to deregister output helper hook "
394 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: "
395 "error %d returned\n", __func__, error);
396 }
397
398 /* Remove the IPv4 addresses from all interfaces. */
399 in_ifscrub_all();
400
401 /* Make sure the IPv4 routes are gone as well. */
402 IFNET_RLOCK();
403 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
404 rt_flushifroutes_af(ifp, AF_INET);
405 IFNET_RUNLOCK();
406
407 /* Destroy IP reassembly queue. */
408 ipreass_destroy();
409
410 /* Cleanup in_ifaddr hash table; should be empty. */
411 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
412 }
413
414 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL);
415 #endif
416
417 #ifdef RSS
418 /*
419 * IP direct input routine.
420 *
421 * This is called when reinjecting completed fragments where
422 * all of the previous checking and book-keeping has been done.
423 */
424 void
425 ip_direct_input(struct mbuf *m)
426 {
427 struct ip *ip;
428 int hlen;
429
430 ip = mtod(m, struct ip *);
431 hlen = ip->ip_hl << 2;
432
433 IPSTAT_INC(ips_delivered);
434 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
435 return;
436 }
437 #endif
438
439 /*
440 * Ip input routine. Checksum and byte swap header. If fragmented
441 * try to reassemble. Process options. Pass to next level.
442 */
443 void
444 ip_input(struct mbuf *m)
445 {
446 struct ip *ip = NULL;
447 struct in_ifaddr *ia = NULL;
448 struct ifaddr *ifa;
449 struct ifnet *ifp;
450 int checkif, hlen = 0;
451 uint16_t sum, ip_len;
452 int dchg = 0; /* dest changed after fw */
453 struct in_addr odst; /* original dst address */
454
455 M_ASSERTPKTHDR(m);
456
457 if (m->m_flags & M_FASTFWD_OURS) {
458 m->m_flags &= ~M_FASTFWD_OURS;
459 /* Set up some basics that will be used later. */
460 ip = mtod(m, struct ip *);
461 hlen = ip->ip_hl << 2;
462 ip_len = ntohs(ip->ip_len);
463 goto ours;
464 }
465
466 IPSTAT_INC(ips_total);
467
468 if (m->m_pkthdr.len < sizeof(struct ip))
469 goto tooshort;
470
471 if (m->m_len < sizeof (struct ip) &&
472 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
473 IPSTAT_INC(ips_toosmall);
474 return;
475 }
476 ip = mtod(m, struct ip *);
477
478 if (ip->ip_v != IPVERSION) {
479 IPSTAT_INC(ips_badvers);
480 goto bad;
481 }
482
483 hlen = ip->ip_hl << 2;
484 if (hlen < sizeof(struct ip)) { /* minimum header length */
485 IPSTAT_INC(ips_badhlen);
486 goto bad;
487 }
488 if (hlen > m->m_len) {
489 if ((m = m_pullup(m, hlen)) == NULL) {
490 IPSTAT_INC(ips_badhlen);
491 return;
492 }
493 ip = mtod(m, struct ip *);
494 }
495
496 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
497
498 /* 127/8 must not appear on wire - RFC1122 */
499 ifp = m->m_pkthdr.rcvif;
500 if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
501 (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
502 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
503 IPSTAT_INC(ips_badaddr);
504 goto bad;
505 }
506 }
507
508 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
509 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
510 } else {
511 if (hlen == sizeof(struct ip)) {
512 sum = in_cksum_hdr(ip);
513 } else {
514 sum = in_cksum(m, hlen);
515 }
516 }
517 if (sum) {
518 IPSTAT_INC(ips_badsum);
519 goto bad;
520 }
521
522 #ifdef ALTQ
523 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
524 /* packet is dropped by traffic conditioner */
525 return;
526 #endif
527
528 ip_len = ntohs(ip->ip_len);
529 if (ip_len < hlen) {
530 IPSTAT_INC(ips_badlen);
531 goto bad;
532 }
533
534 /*
535 * Check that the amount of data in the buffers
536 * is as at least much as the IP header would have us expect.
537 * Trim mbufs if longer than we expect.
538 * Drop packet if shorter than we expect.
539 */
540 if (m->m_pkthdr.len < ip_len) {
541 tooshort:
542 IPSTAT_INC(ips_tooshort);
543 goto bad;
544 }
545 if (m->m_pkthdr.len > ip_len) {
546 if (m->m_len == m->m_pkthdr.len) {
547 m->m_len = ip_len;
548 m->m_pkthdr.len = ip_len;
549 } else
550 m_adj(m, ip_len - m->m_pkthdr.len);
551 }
552
553 /* Try to forward the packet, but if we fail continue */
554 #ifdef IPSEC
555 /* For now we do not handle IPSEC in tryforward. */
556 if (!key_havesp(IPSEC_DIR_INBOUND) && !key_havesp(IPSEC_DIR_OUTBOUND) &&
557 (V_ipforwarding == 1))
558 if (ip_tryforward(m) == NULL)
559 return;
560 /*
561 * Bypass packet filtering for packets previously handled by IPsec.
562 */
563 if (ip_ipsec_filtertunnel(m))
564 goto passin;
565 #else
566 if (V_ipforwarding == 1)
567 if (ip_tryforward(m) == NULL)
568 return;
569 #endif /* IPSEC */
570
571 /*
572 * Run through list of hooks for input packets.
573 *
574 * NB: Beware of the destination address changing (e.g.
575 * by NAT rewriting). When this happens, tell
576 * ip_forward to do the right thing.
577 */
578
579 /* Jump over all PFIL processing if hooks are not active. */
580 if (!PFIL_HOOKED(&V_inet_pfil_hook))
581 goto passin;
582
583 odst = ip->ip_dst;
584 if (pfil_run_hooks(&V_inet_pfil_hook, &m, ifp, PFIL_IN, NULL) != 0)
585 return;
586 if (m == NULL) /* consumed by filter */
587 return;
588
589 ip = mtod(m, struct ip *);
590 dchg = (odst.s_addr != ip->ip_dst.s_addr);
591 ifp = m->m_pkthdr.rcvif;
592
593 if (m->m_flags & M_FASTFWD_OURS) {
594 m->m_flags &= ~M_FASTFWD_OURS;
595 goto ours;
596 }
597 if (m->m_flags & M_IP_NEXTHOP) {
598 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
599 /*
600 * Directly ship the packet on. This allows
601 * forwarding packets originally destined to us
602 * to some other directly connected host.
603 */
604 ip_forward(m, 1);
605 return;
606 }
607 }
608 passin:
609
610 /*
611 * Process options and, if not destined for us,
612 * ship it on. ip_dooptions returns 1 when an
613 * error was detected (causing an icmp message
614 * to be sent and the original packet to be freed).
615 */
616 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
617 return;
618
619 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
620 * matter if it is destined to another node, or whether it is
621 * a multicast one, RSVP wants it! and prevents it from being forwarded
622 * anywhere else. Also checks if the rsvp daemon is running before
623 * grabbing the packet.
624 */
625 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
626 goto ours;
627
628 /*
629 * Check our list of addresses, to see if the packet is for us.
630 * If we don't have any addresses, assume any unicast packet
631 * we receive might be for us (and let the upper layers deal
632 * with it).
633 */
634 if (TAILQ_EMPTY(&V_in_ifaddrhead) &&
635 (m->m_flags & (M_MCAST|M_BCAST)) == 0)
636 goto ours;
637
638 /*
639 * Enable a consistency check between the destination address
640 * and the arrival interface for a unicast packet (the RFC 1122
641 * strong ES model) if IP forwarding is disabled and the packet
642 * is not locally generated and the packet is not subject to
643 * 'ipfw fwd'.
644 *
645 * XXX - Checking also should be disabled if the destination
646 * address is ipnat'ed to a different interface.
647 *
648 * XXX - Checking is incompatible with IP aliases added
649 * to the loopback interface instead of the interface where
650 * the packets are received.
651 *
652 * XXX - This is the case for carp vhost IPs as well so we
653 * insert a workaround. If the packet got here, we already
654 * checked with carp_iamatch() and carp_forus().
655 */
656 checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
657 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
658 ifp->if_carp == NULL && (dchg == 0);
659
660 /*
661 * Check for exact addresses in the hash bucket.
662 */
663 /* IN_IFADDR_RLOCK(); */
664 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
665 /*
666 * If the address matches, verify that the packet
667 * arrived via the correct interface if checking is
668 * enabled.
669 */
670 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
671 (!checkif || ia->ia_ifp == ifp)) {
672 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
673 counter_u64_add(ia->ia_ifa.ifa_ibytes,
674 m->m_pkthdr.len);
675 /* IN_IFADDR_RUNLOCK(); */
676 goto ours;
677 }
678 }
679 /* IN_IFADDR_RUNLOCK(); */
680
681 /*
682 * Check for broadcast addresses.
683 *
684 * Only accept broadcast packets that arrive via the matching
685 * interface. Reception of forwarded directed broadcasts would
686 * be handled via ip_forward() and ether_output() with the loopback
687 * into the stack for SIMPLEX interfaces handled by ether_output().
688 */
689 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
690 IF_ADDR_RLOCK(ifp);
691 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
692 if (ifa->ifa_addr->sa_family != AF_INET)
693 continue;
694 ia = ifatoia(ifa);
695 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
696 ip->ip_dst.s_addr) {
697 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
698 counter_u64_add(ia->ia_ifa.ifa_ibytes,
699 m->m_pkthdr.len);
700 IF_ADDR_RUNLOCK(ifp);
701 goto ours;
702 }
703 #ifdef BOOTP_COMPAT
704 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
705 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
706 counter_u64_add(ia->ia_ifa.ifa_ibytes,
707 m->m_pkthdr.len);
708 IF_ADDR_RUNLOCK(ifp);
709 goto ours;
710 }
711 #endif
712 }
713 IF_ADDR_RUNLOCK(ifp);
714 ia = NULL;
715 }
716 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
717 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
718 IPSTAT_INC(ips_cantforward);
719 m_freem(m);
720 return;
721 }
722 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
723 if (V_ip_mrouter) {
724 /*
725 * If we are acting as a multicast router, all
726 * incoming multicast packets are passed to the
727 * kernel-level multicast forwarding function.
728 * The packet is returned (relatively) intact; if
729 * ip_mforward() returns a non-zero value, the packet
730 * must be discarded, else it may be accepted below.
731 */
732 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
733 IPSTAT_INC(ips_cantforward);
734 m_freem(m);
735 return;
736 }
737
738 /*
739 * The process-level routing daemon needs to receive
740 * all multicast IGMP packets, whether or not this
741 * host belongs to their destination groups.
742 */
743 if (ip->ip_p == IPPROTO_IGMP)
744 goto ours;
745 IPSTAT_INC(ips_forward);
746 }
747 /*
748 * Assume the packet is for us, to avoid prematurely taking
749 * a lock on the in_multi hash. Protocols must perform
750 * their own filtering and update statistics accordingly.
751 */
752 goto ours;
753 }
754 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
755 goto ours;
756 if (ip->ip_dst.s_addr == INADDR_ANY)
757 goto ours;
758
759 /*
760 * Not for us; forward if possible and desirable.
761 */
762 if (V_ipforwarding == 0) {
763 IPSTAT_INC(ips_cantforward);
764 m_freem(m);
765 } else {
766 ip_forward(m, dchg);
767 }
768 return;
769
770 ours:
771 #ifdef IPSTEALTH
772 /*
773 * IPSTEALTH: Process non-routing options only
774 * if the packet is destined for us.
775 */
776 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1))
777 return;
778 #endif /* IPSTEALTH */
779
780 /*
781 * Attempt reassembly; if it succeeds, proceed.
782 * ip_reass() will return a different mbuf.
783 */
784 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
785 /* XXXGL: shouldn't we save & set m_flags? */
786 m = ip_reass(m);
787 if (m == NULL)
788 return;
789 ip = mtod(m, struct ip *);
790 /* Get the header length of the reassembled packet */
791 hlen = ip->ip_hl << 2;
792 }
793
794 #ifdef IPSEC
795 /*
796 * enforce IPsec policy checking if we are seeing last header.
797 * note that we do not visit this with protocols with pcb layer
798 * code - like udp/tcp/raw ip.
799 */
800 if (ip_ipsec_input(m, ip->ip_p) != 0)
801 goto bad;
802 #endif /* IPSEC */
803
804 /*
805 * Switch out to protocol's input routine.
806 */
807 IPSTAT_INC(ips_delivered);
808
809 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
810 return;
811 bad:
812 m_freem(m);
813 }
814
815 /*
816 * IP timer processing;
817 * if a timer expires on a reassembly
818 * queue, discard it.
819 */
820 void
821 ip_slowtimo(void)
822 {
823 VNET_ITERATOR_DECL(vnet_iter);
824
825 VNET_LIST_RLOCK_NOSLEEP();
826 VNET_FOREACH(vnet_iter) {
827 CURVNET_SET(vnet_iter);
828 ipreass_slowtimo();
829 CURVNET_RESTORE();
830 }
831 VNET_LIST_RUNLOCK_NOSLEEP();
832 }
833
834 void
835 ip_drain(void)
836 {
837 VNET_ITERATOR_DECL(vnet_iter);
838
839 VNET_LIST_RLOCK_NOSLEEP();
840 VNET_FOREACH(vnet_iter) {
841 CURVNET_SET(vnet_iter);
842 ipreass_drain();
843 CURVNET_RESTORE();
844 }
845 VNET_LIST_RUNLOCK_NOSLEEP();
846 }
847
848 /*
849 * The protocol to be inserted into ip_protox[] must be already registered
850 * in inetsw[], either statically or through pf_proto_register().
851 */
852 int
853 ipproto_register(short ipproto)
854 {
855 struct protosw *pr;
856
857 /* Sanity checks. */
858 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
859 return (EPROTONOSUPPORT);
860
861 /*
862 * The protocol slot must not be occupied by another protocol
863 * already. An index pointing to IPPROTO_RAW is unused.
864 */
865 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
866 if (pr == NULL)
867 return (EPFNOSUPPORT);
868 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */
869 return (EEXIST);
870
871 /* Find the protocol position in inetsw[] and set the index. */
872 for (pr = inetdomain.dom_protosw;
873 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
874 if (pr->pr_domain->dom_family == PF_INET &&
875 pr->pr_protocol && pr->pr_protocol == ipproto) {
876 ip_protox[pr->pr_protocol] = pr - inetsw;
877 return (0);
878 }
879 }
880 return (EPROTONOSUPPORT);
881 }
882
883 int
884 ipproto_unregister(short ipproto)
885 {
886 struct protosw *pr;
887
888 /* Sanity checks. */
889 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
890 return (EPROTONOSUPPORT);
891
892 /* Check if the protocol was indeed registered. */
893 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
894 if (pr == NULL)
895 return (EPFNOSUPPORT);
896 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */
897 return (ENOENT);
898
899 /* Reset the protocol slot to IPPROTO_RAW. */
900 ip_protox[ipproto] = pr - inetsw;
901 return (0);
902 }
903
904 u_char inetctlerrmap[PRC_NCMDS] = {
905 0, 0, 0, 0,
906 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
907 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
908 EMSGSIZE, EHOSTUNREACH, 0, 0,
909 0, 0, EHOSTUNREACH, 0,
910 ENOPROTOOPT, ECONNREFUSED
911 };
912
913 /*
914 * Forward a packet. If some error occurs return the sender
915 * an icmp packet. Note we can't always generate a meaningful
916 * icmp message because icmp doesn't have a large enough repertoire
917 * of codes and types.
918 *
919 * If not forwarding, just drop the packet. This could be confusing
920 * if ipforwarding was zero but some routing protocol was advancing
921 * us as a gateway to somewhere. However, we must let the routing
922 * protocol deal with that.
923 *
924 * The srcrt parameter indicates whether the packet is being forwarded
925 * via a source route.
926 */
927 void
928 ip_forward(struct mbuf *m, int srcrt)
929 {
930 struct ip *ip = mtod(m, struct ip *);
931 struct in_ifaddr *ia;
932 struct mbuf *mcopy;
933 struct sockaddr_in *sin;
934 struct in_addr dest;
935 struct route ro;
936 int error, type = 0, code = 0, mtu = 0;
937
938 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
939 IPSTAT_INC(ips_cantforward);
940 m_freem(m);
941 return;
942 }
943 #ifdef IPSEC
944 if (ip_ipsec_fwd(m) != 0) {
945 IPSTAT_INC(ips_cantforward);
946 m_freem(m);
947 return;
948 }
949 #endif /* IPSEC */
950 #ifdef IPSTEALTH
951 if (!V_ipstealth) {
952 #endif
953 if (ip->ip_ttl <= IPTTLDEC) {
954 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS,
955 0, 0);
956 return;
957 }
958 #ifdef IPSTEALTH
959 }
960 #endif
961
962 bzero(&ro, sizeof(ro));
963 sin = (struct sockaddr_in *)&ro.ro_dst;
964 sin->sin_family = AF_INET;
965 sin->sin_len = sizeof(*sin);
966 sin->sin_addr = ip->ip_dst;
967 #ifdef RADIX_MPATH
968 rtalloc_mpath_fib(&ro,
969 ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr),
970 M_GETFIB(m));
971 #else
972 in_rtalloc_ign(&ro, 0, M_GETFIB(m));
973 #endif
974 if (ro.ro_rt != NULL) {
975 ia = ifatoia(ro.ro_rt->rt_ifa);
976 ifa_ref(&ia->ia_ifa);
977 } else
978 ia = NULL;
979 #ifndef IPSEC
980 /*
981 * 'ia' may be NULL if there is no route for this destination.
982 * In case of IPsec, Don't discard it just yet, but pass it to
983 * ip_output in case of outgoing IPsec policy.
984 */
985 if (!srcrt && ia == NULL) {
986 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
987 RO_RTFREE(&ro);
988 return;
989 }
990 #endif
991
992 /*
993 * Save the IP header and at most 8 bytes of the payload,
994 * in case we need to generate an ICMP message to the src.
995 *
996 * XXX this can be optimized a lot by saving the data in a local
997 * buffer on the stack (72 bytes at most), and only allocating the
998 * mbuf if really necessary. The vast majority of the packets
999 * are forwarded without having to send an ICMP back (either
1000 * because unnecessary, or because rate limited), so we are
1001 * really we are wasting a lot of work here.
1002 *
1003 * We don't use m_copy() because it might return a reference
1004 * to a shared cluster. Both this function and ip_output()
1005 * assume exclusive access to the IP header in `m', so any
1006 * data in a cluster may change before we reach icmp_error().
1007 */
1008 mcopy = m_gethdr(M_NOWAIT, m->m_type);
1009 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) {
1010 /*
1011 * It's probably ok if the pkthdr dup fails (because
1012 * the deep copy of the tag chain failed), but for now
1013 * be conservative and just discard the copy since
1014 * code below may some day want the tags.
1015 */
1016 m_free(mcopy);
1017 mcopy = NULL;
1018 }
1019 if (mcopy != NULL) {
1020 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
1021 mcopy->m_pkthdr.len = mcopy->m_len;
1022 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1023 }
1024
1025 #ifdef IPSTEALTH
1026 if (!V_ipstealth) {
1027 #endif
1028 ip->ip_ttl -= IPTTLDEC;
1029 #ifdef IPSTEALTH
1030 }
1031 #endif
1032
1033 /*
1034 * If forwarding packet using same interface that it came in on,
1035 * perhaps should send a redirect to sender to shortcut a hop.
1036 * Only send redirect if source is sending directly to us,
1037 * and if packet was not source routed (or has any options).
1038 * Also, don't send redirect if forwarding using a default route
1039 * or a route modified by a redirect.
1040 */
1041 dest.s_addr = 0;
1042 if (!srcrt && V_ipsendredirects &&
1043 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
1044 struct rtentry *rt;
1045
1046 rt = ro.ro_rt;
1047
1048 if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1049 satosin(rt_key(rt))->sin_addr.s_addr != 0) {
1050 #define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa))
1051 u_long src = ntohl(ip->ip_src.s_addr);
1052
1053 if (RTA(rt) &&
1054 (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) {
1055 if (rt->rt_flags & RTF_GATEWAY)
1056 dest.s_addr = satosin(rt->rt_gateway)->sin_addr.s_addr;
1057 else
1058 dest.s_addr = ip->ip_dst.s_addr;
1059 /* Router requirements says to only send host redirects */
1060 type = ICMP_REDIRECT;
1061 code = ICMP_REDIRECT_HOST;
1062 }
1063 }
1064 }
1065
1066 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
1067
1068 if (error == EMSGSIZE && ro.ro_rt)
1069 mtu = ro.ro_rt->rt_mtu;
1070 RO_RTFREE(&ro);
1071
1072 if (error)
1073 IPSTAT_INC(ips_cantforward);
1074 else {
1075 IPSTAT_INC(ips_forward);
1076 if (type)
1077 IPSTAT_INC(ips_redirectsent);
1078 else {
1079 if (mcopy)
1080 m_freem(mcopy);
1081 if (ia != NULL)
1082 ifa_free(&ia->ia_ifa);
1083 return;
1084 }
1085 }
1086 if (mcopy == NULL) {
1087 if (ia != NULL)
1088 ifa_free(&ia->ia_ifa);
1089 return;
1090 }
1091
1092 switch (error) {
1093
1094 case 0: /* forwarded, but need redirect */
1095 /* type, code set above */
1096 break;
1097
1098 case ENETUNREACH:
1099 case EHOSTUNREACH:
1100 case ENETDOWN:
1101 case EHOSTDOWN:
1102 default:
1103 type = ICMP_UNREACH;
1104 code = ICMP_UNREACH_HOST;
1105 break;
1106
1107 case EMSGSIZE:
1108 type = ICMP_UNREACH;
1109 code = ICMP_UNREACH_NEEDFRAG;
1110
1111 #ifdef IPSEC
1112 /*
1113 * If IPsec is configured for this path,
1114 * override any possibly mtu value set by ip_output.
1115 */
1116 mtu = ip_ipsec_mtu(mcopy, mtu);
1117 #endif /* IPSEC */
1118 /*
1119 * If the MTU was set before make sure we are below the
1120 * interface MTU.
1121 * If the MTU wasn't set before use the interface mtu or
1122 * fall back to the next smaller mtu step compared to the
1123 * current packet size.
1124 */
1125 if (mtu != 0) {
1126 if (ia != NULL)
1127 mtu = min(mtu, ia->ia_ifp->if_mtu);
1128 } else {
1129 if (ia != NULL)
1130 mtu = ia->ia_ifp->if_mtu;
1131 else
1132 mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
1133 }
1134 IPSTAT_INC(ips_cantfrag);
1135 break;
1136
1137 case ENOBUFS:
1138 case EACCES: /* ipfw denied packet */
1139 m_freem(mcopy);
1140 if (ia != NULL)
1141 ifa_free(&ia->ia_ifa);
1142 return;
1143 }
1144 if (ia != NULL)
1145 ifa_free(&ia->ia_ifa);
1146 icmp_error(mcopy, type, code, dest.s_addr, mtu);
1147 }
1148
1149 void
1150 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1151 struct mbuf *m)
1152 {
1153
1154 if (inp->inp_socket->so_options & (SO_BINTIME | SO_TIMESTAMP)) {
1155 struct bintime bt;
1156
1157 bintime(&bt);
1158 if (inp->inp_socket->so_options & SO_BINTIME) {
1159 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt),
1160 SCM_BINTIME, SOL_SOCKET);
1161 if (*mp)
1162 mp = &(*mp)->m_next;
1163 }
1164 if (inp->inp_socket->so_options & SO_TIMESTAMP) {
1165 struct timeval tv;
1166
1167 bintime2timeval(&bt, &tv);
1168 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1169 SCM_TIMESTAMP, SOL_SOCKET);
1170 if (*mp)
1171 mp = &(*mp)->m_next;
1172 }
1173 }
1174 if (inp->inp_flags & INP_RECVDSTADDR) {
1175 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst,
1176 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1177 if (*mp)
1178 mp = &(*mp)->m_next;
1179 }
1180 if (inp->inp_flags & INP_RECVTTL) {
1181 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl,
1182 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
1183 if (*mp)
1184 mp = &(*mp)->m_next;
1185 }
1186 #ifdef notyet
1187 /* XXX
1188 * Moving these out of udp_input() made them even more broken
1189 * than they already were.
1190 */
1191 /* options were tossed already */
1192 if (inp->inp_flags & INP_RECVOPTS) {
1193 *mp = sbcreatecontrol((caddr_t)opts_deleted_above,
1194 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1195 if (*mp)
1196 mp = &(*mp)->m_next;
1197 }
1198 /* ip_srcroute doesn't do what we want here, need to fix */
1199 if (inp->inp_flags & INP_RECVRETOPTS) {
1200 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m),
1201 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1202 if (*mp)
1203 mp = &(*mp)->m_next;
1204 }
1205 #endif
1206 if (inp->inp_flags & INP_RECVIF) {
1207 struct ifnet *ifp;
1208 struct sdlbuf {
1209 struct sockaddr_dl sdl;
1210 u_char pad[32];
1211 } sdlbuf;
1212 struct sockaddr_dl *sdp;
1213 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
1214
1215 if ((ifp = m->m_pkthdr.rcvif) &&
1216 ifp->if_index && ifp->if_index <= V_if_index) {
1217 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
1218 /*
1219 * Change our mind and don't try copy.
1220 */
1221 if (sdp->sdl_family != AF_LINK ||
1222 sdp->sdl_len > sizeof(sdlbuf)) {
1223 goto makedummy;
1224 }
1225 bcopy(sdp, sdl2, sdp->sdl_len);
1226 } else {
1227 makedummy:
1228 sdl2->sdl_len =
1229 offsetof(struct sockaddr_dl, sdl_data[0]);
1230 sdl2->sdl_family = AF_LINK;
1231 sdl2->sdl_index = 0;
1232 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
1233 }
1234 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len,
1235 IP_RECVIF, IPPROTO_IP);
1236 if (*mp)
1237 mp = &(*mp)->m_next;
1238 }
1239 if (inp->inp_flags & INP_RECVTOS) {
1240 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos,
1241 sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
1242 if (*mp)
1243 mp = &(*mp)->m_next;
1244 }
1245
1246 if (inp->inp_flags2 & INP_RECVFLOWID) {
1247 uint32_t flowid, flow_type;
1248
1249 flowid = m->m_pkthdr.flowid;
1250 flow_type = M_HASHTYPE_GET(m);
1251
1252 /*
1253 * XXX should handle the failure of one or the
1254 * other - don't populate both?
1255 */
1256 *mp = sbcreatecontrol((caddr_t) &flowid,
1257 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP);
1258 if (*mp)
1259 mp = &(*mp)->m_next;
1260 *mp = sbcreatecontrol((caddr_t) &flow_type,
1261 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP);
1262 if (*mp)
1263 mp = &(*mp)->m_next;
1264 }
1265
1266 #ifdef RSS
1267 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1268 uint32_t flowid, flow_type;
1269 uint32_t rss_bucketid;
1270
1271 flowid = m->m_pkthdr.flowid;
1272 flow_type = M_HASHTYPE_GET(m);
1273
1274 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1275 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1276 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP);
1277 if (*mp)
1278 mp = &(*mp)->m_next;
1279 }
1280 }
1281 #endif
1282 }
1283
1284 /*
1285 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
1286 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
1287 * locking. This code remains in ip_input.c as ip_mroute.c is optionally
1288 * compiled.
1289 */
1290 static VNET_DEFINE(int, ip_rsvp_on);
1291 VNET_DEFINE(struct socket *, ip_rsvpd);
1292
1293 #define V_ip_rsvp_on VNET(ip_rsvp_on)
1294
1295 int
1296 ip_rsvp_init(struct socket *so)
1297 {
1298
1299 if (so->so_type != SOCK_RAW ||
1300 so->so_proto->pr_protocol != IPPROTO_RSVP)
1301 return EOPNOTSUPP;
1302
1303 if (V_ip_rsvpd != NULL)
1304 return EADDRINUSE;
1305
1306 V_ip_rsvpd = so;
1307 /*
1308 * This may seem silly, but we need to be sure we don't over-increment
1309 * the RSVP counter, in case something slips up.
1310 */
1311 if (!V_ip_rsvp_on) {
1312 V_ip_rsvp_on = 1;
1313 V_rsvp_on++;
1314 }
1315
1316 return 0;
1317 }
1318
1319 int
1320 ip_rsvp_done(void)
1321 {
1322
1323 V_ip_rsvpd = NULL;
1324 /*
1325 * This may seem silly, but we need to be sure we don't over-decrement
1326 * the RSVP counter, in case something slips up.
1327 */
1328 if (V_ip_rsvp_on) {
1329 V_ip_rsvp_on = 0;
1330 V_rsvp_on--;
1331 }
1332 return 0;
1333 }
1334
1335 int
1336 rsvp_input(struct mbuf **mp, int *offp, int proto)
1337 {
1338 struct mbuf *m;
1339
1340 m = *mp;
1341 *mp = NULL;
1342
1343 if (rsvp_input_p) { /* call the real one if loaded */
1344 *mp = m;
1345 rsvp_input_p(mp, offp, proto);
1346 return (IPPROTO_DONE);
1347 }
1348
1349 /* Can still get packets with rsvp_on = 0 if there is a local member
1350 * of the group to which the RSVP packet is addressed. But in this
1351 * case we want to throw the packet away.
1352 */
1353
1354 if (!V_rsvp_on) {
1355 m_freem(m);
1356 return (IPPROTO_DONE);
1357 }
1358
1359 if (V_ip_rsvpd != NULL) {
1360 *mp = m;
1361 rip_input(mp, offp, proto);
1362 return (IPPROTO_DONE);
1363 }
1364 /* Drop the packet */
1365 m_freem(m);
1366 return (IPPROTO_DONE);
1367 }
Cache object: 1bfd0b51c8d35a868d80bc92dfb29e43
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