1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include "opt_bootp.h"
38 #include "opt_ipstealth.h"
39 #include "opt_ipsec.h"
40 #include "opt_route.h"
41 #include "opt_rss.h"
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/hhook.h>
46 #include <sys/mbuf.h>
47 #include <sys/malloc.h>
48 #include <sys/domain.h>
49 #include <sys/protosw.h>
50 #include <sys/socket.h>
51 #include <sys/time.h>
52 #include <sys/kernel.h>
53 #include <sys/lock.h>
54 #include <sys/rmlock.h>
55 #include <sys/rwlock.h>
56 #include <sys/sdt.h>
57 #include <sys/syslog.h>
58 #include <sys/sysctl.h>
59
60 #include <net/if.h>
61 #include <net/if_types.h>
62 #include <net/if_var.h>
63 #include <net/if_dl.h>
64 #include <net/pfil.h>
65 #include <net/route.h>
66 #include <net/route/nhop.h>
67 #include <net/netisr.h>
68 #include <net/rss_config.h>
69 #include <net/vnet.h>
70
71 #include <netinet/in.h>
72 #include <netinet/in_kdtrace.h>
73 #include <netinet/in_systm.h>
74 #include <netinet/in_var.h>
75 #include <netinet/ip.h>
76 #include <netinet/in_fib.h>
77 #include <netinet/in_pcb.h>
78 #include <netinet/ip_var.h>
79 #include <netinet/ip_fw.h>
80 #include <netinet/ip_icmp.h>
81 #include <netinet/ip_options.h>
82 #include <machine/in_cksum.h>
83 #include <netinet/ip_carp.h>
84 #include <netinet/in_rss.h>
85
86 #include <netipsec/ipsec_support.h>
87
88 #include <sys/socketvar.h>
89
90 #include <security/mac/mac_framework.h>
91
92 #ifdef CTASSERT
93 CTASSERT(sizeof(struct ip) == 20);
94 #endif
95
96 /* IP reassembly functions are defined in ip_reass.c. */
97 extern void ipreass_init(void);
98 extern void ipreass_drain(void);
99 extern void ipreass_slowtimo(void);
100 #ifdef VIMAGE
101 extern void ipreass_destroy(void);
102 #endif
103
104 struct rmlock in_ifaddr_lock;
105 RM_SYSINIT(in_ifaddr_lock, &in_ifaddr_lock, "in_ifaddr_lock");
106
107 VNET_DEFINE(int, rsvp_on);
108
109 VNET_DEFINE(int, ipforwarding);
110 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW,
111 &VNET_NAME(ipforwarding), 0,
112 "Enable IP forwarding between interfaces");
113
114 /*
115 * Respond with an ICMP host redirect when we forward a packet out of
116 * the same interface on which it was received. See RFC 792.
117 */
118 VNET_DEFINE(int, ipsendredirects) = 1;
119 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW,
120 &VNET_NAME(ipsendredirects), 0,
121 "Enable sending IP redirects");
122
123 /*
124 * XXX - Setting ip_checkinterface mostly implements the receive side of
125 * the Strong ES model described in RFC 1122, but since the routing table
126 * and transmit implementation do not implement the Strong ES model,
127 * setting this to 1 results in an odd hybrid.
128 *
129 * XXX - ip_checkinterface currently must be disabled if you use ipnat
130 * to translate the destination address to another local interface.
131 *
132 * XXX - ip_checkinterface must be disabled if you add IP aliases
133 * to the loopback interface instead of the interface where the
134 * packets for those addresses are received.
135 */
136 VNET_DEFINE_STATIC(int, ip_checkinterface);
137 #define V_ip_checkinterface VNET(ip_checkinterface)
138 SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_VNET | CTLFLAG_RW,
139 &VNET_NAME(ip_checkinterface), 0,
140 "Verify packet arrives on correct interface");
141
142 VNET_DEFINE(pfil_head_t, inet_pfil_head); /* Packet filter hooks */
143
144 static struct netisr_handler ip_nh = {
145 .nh_name = "ip",
146 .nh_handler = ip_input,
147 .nh_proto = NETISR_IP,
148 #ifdef RSS
149 .nh_m2cpuid = rss_soft_m2cpuid_v4,
150 .nh_policy = NETISR_POLICY_CPU,
151 .nh_dispatch = NETISR_DISPATCH_HYBRID,
152 #else
153 .nh_policy = NETISR_POLICY_FLOW,
154 #endif
155 };
156
157 #ifdef RSS
158 /*
159 * Directly dispatched frames are currently assumed
160 * to have a flowid already calculated.
161 *
162 * It should likely have something that assert it
163 * actually has valid flow details.
164 */
165 static struct netisr_handler ip_direct_nh = {
166 .nh_name = "ip_direct",
167 .nh_handler = ip_direct_input,
168 .nh_proto = NETISR_IP_DIRECT,
169 .nh_m2cpuid = rss_soft_m2cpuid_v4,
170 .nh_policy = NETISR_POLICY_CPU,
171 .nh_dispatch = NETISR_DISPATCH_HYBRID,
172 };
173 #endif
174
175 extern struct domain inetdomain;
176 extern struct protosw inetsw[];
177 u_char ip_protox[IPPROTO_MAX];
178 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
179 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
180 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
181
182 #ifdef IPCTL_DEFMTU
183 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
184 &ip_mtu, 0, "Default MTU");
185 #endif
186
187 #ifdef IPSTEALTH
188 VNET_DEFINE(int, ipstealth);
189 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW,
190 &VNET_NAME(ipstealth), 0,
191 "IP stealth mode, no TTL decrementation on forwarding");
192 #endif
193
194 /*
195 * IP statistics are stored in the "array" of counter(9)s.
196 */
197 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat);
198 VNET_PCPUSTAT_SYSINIT(ipstat);
199 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat,
200 "IP statistics (struct ipstat, netinet/ip_var.h)");
201
202 #ifdef VIMAGE
203 VNET_PCPUSTAT_SYSUNINIT(ipstat);
204 #endif /* VIMAGE */
205
206 /*
207 * Kernel module interface for updating ipstat. The argument is an index
208 * into ipstat treated as an array.
209 */
210 void
kmod_ipstat_inc(int statnum)211 kmod_ipstat_inc(int statnum)
212 {
213
214 counter_u64_add(VNET(ipstat)[statnum], 1);
215 }
216
217 void
kmod_ipstat_dec(int statnum)218 kmod_ipstat_dec(int statnum)
219 {
220
221 counter_u64_add(VNET(ipstat)[statnum], -1);
222 }
223
224 static int
sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)225 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
226 {
227 int error, qlimit;
228
229 netisr_getqlimit(&ip_nh, &qlimit);
230 error = sysctl_handle_int(oidp, &qlimit, 0, req);
231 if (error || !req->newptr)
232 return (error);
233 if (qlimit < 1)
234 return (EINVAL);
235 return (netisr_setqlimit(&ip_nh, qlimit));
236 }
237 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
238 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0,
239 sysctl_netinet_intr_queue_maxlen, "I",
240 "Maximum size of the IP input queue");
241
242 static int
sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)243 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
244 {
245 u_int64_t qdrops_long;
246 int error, qdrops;
247
248 netisr_getqdrops(&ip_nh, &qdrops_long);
249 qdrops = qdrops_long;
250 error = sysctl_handle_int(oidp, &qdrops, 0, req);
251 if (error || !req->newptr)
252 return (error);
253 if (qdrops != 0)
254 return (EINVAL);
255 netisr_clearqdrops(&ip_nh);
256 return (0);
257 }
258
259 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
260 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
261 0, 0, sysctl_netinet_intr_queue_drops, "I",
262 "Number of packets dropped from the IP input queue");
263
264 #ifdef RSS
265 static int
sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)266 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
267 {
268 int error, qlimit;
269
270 netisr_getqlimit(&ip_direct_nh, &qlimit);
271 error = sysctl_handle_int(oidp, &qlimit, 0, req);
272 if (error || !req->newptr)
273 return (error);
274 if (qlimit < 1)
275 return (EINVAL);
276 return (netisr_setqlimit(&ip_direct_nh, qlimit));
277 }
278 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
279 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
280 0, 0, sysctl_netinet_intr_direct_queue_maxlen,
281 "I", "Maximum size of the IP direct input queue");
282
283 static int
sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS)284 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS)
285 {
286 u_int64_t qdrops_long;
287 int error, qdrops;
288
289 netisr_getqdrops(&ip_direct_nh, &qdrops_long);
290 qdrops = qdrops_long;
291 error = sysctl_handle_int(oidp, &qdrops, 0, req);
292 if (error || !req->newptr)
293 return (error);
294 if (qdrops != 0)
295 return (EINVAL);
296 netisr_clearqdrops(&ip_direct_nh);
297 return (0);
298 }
299
300 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops,
301 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
302 sysctl_netinet_intr_direct_queue_drops, "I",
303 "Number of packets dropped from the IP direct input queue");
304 #endif /* RSS */
305
306 /*
307 * IP initialization: fill in IP protocol switch table.
308 * All protocols not implemented in kernel go to raw IP protocol handler.
309 */
310 void
ip_init(void)311 ip_init(void)
312 {
313 struct pfil_head_args args;
314 struct protosw *pr;
315 int i;
316
317 CK_STAILQ_INIT(&V_in_ifaddrhead);
318 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
319
320 /* Initialize IP reassembly queue. */
321 ipreass_init();
322
323 /* Initialize packet filter hooks. */
324 args.pa_version = PFIL_VERSION;
325 args.pa_flags = PFIL_IN | PFIL_OUT;
326 args.pa_type = PFIL_TYPE_IP4;
327 args.pa_headname = PFIL_INET_NAME;
328 V_inet_pfil_head = pfil_head_register(&args);
329
330 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET,
331 &V_ipsec_hhh_in[HHOOK_IPSEC_INET],
332 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
333 printf("%s: WARNING: unable to register input helper hook\n",
334 __func__);
335 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET,
336 &V_ipsec_hhh_out[HHOOK_IPSEC_INET],
337 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
338 printf("%s: WARNING: unable to register output helper hook\n",
339 __func__);
340
341 /* Skip initialization of globals for non-default instances. */
342 #ifdef VIMAGE
343 if (!IS_DEFAULT_VNET(curvnet)) {
344 netisr_register_vnet(&ip_nh);
345 #ifdef RSS
346 netisr_register_vnet(&ip_direct_nh);
347 #endif
348 return;
349 }
350 #endif
351
352 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
353 if (pr == NULL)
354 panic("ip_init: PF_INET not found");
355
356 /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
357 for (i = 0; i < IPPROTO_MAX; i++)
358 ip_protox[i] = pr - inetsw;
359 /*
360 * Cycle through IP protocols and put them into the appropriate place
361 * in ip_protox[].
362 */
363 for (pr = inetdomain.dom_protosw;
364 pr < inetdomain.dom_protoswNPROTOSW; pr++)
365 if (pr->pr_domain->dom_family == PF_INET &&
366 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) {
367 /* Be careful to only index valid IP protocols. */
368 if (pr->pr_protocol < IPPROTO_MAX)
369 ip_protox[pr->pr_protocol] = pr - inetsw;
370 }
371
372 netisr_register(&ip_nh);
373 #ifdef RSS
374 netisr_register(&ip_direct_nh);
375 #endif
376 }
377
378 #ifdef VIMAGE
379 static void
ip_destroy(void * unused __unused)380 ip_destroy(void *unused __unused)
381 {
382 int error;
383
384 #ifdef RSS
385 netisr_unregister_vnet(&ip_direct_nh);
386 #endif
387 netisr_unregister_vnet(&ip_nh);
388
389 pfil_head_unregister(V_inet_pfil_head);
390 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]);
391 if (error != 0) {
392 printf("%s: WARNING: unable to deregister input helper hook "
393 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: "
394 "error %d returned\n", __func__, error);
395 }
396 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]);
397 if (error != 0) {
398 printf("%s: WARNING: unable to deregister output helper hook "
399 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: "
400 "error %d returned\n", __func__, error);
401 }
402
403 /* Remove the IPv4 addresses from all interfaces. */
404 in_ifscrub_all();
405
406 /* Make sure the IPv4 routes are gone as well. */
407 rib_flush_routes_family(AF_INET);
408
409 /* Destroy IP reassembly queue. */
410 ipreass_destroy();
411
412 /* Cleanup in_ifaddr hash table; should be empty. */
413 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
414 }
415
416 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL);
417 #endif
418
419 #ifdef RSS
420 /*
421 * IP direct input routine.
422 *
423 * This is called when reinjecting completed fragments where
424 * all of the previous checking and book-keeping has been done.
425 */
426 void
ip_direct_input(struct mbuf * m)427 ip_direct_input(struct mbuf *m)
428 {
429 struct ip *ip;
430 int hlen;
431
432 ip = mtod(m, struct ip *);
433 hlen = ip->ip_hl << 2;
434
435 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
436 if (IPSEC_ENABLED(ipv4)) {
437 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
438 return;
439 }
440 #endif /* IPSEC */
441 IPSTAT_INC(ips_delivered);
442 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
443 return;
444 }
445 #endif
446
447 /*
448 * Ip input routine. Checksum and byte swap header. If fragmented
449 * try to reassemble. Process options. Pass to next level.
450 */
451 void
ip_input(struct mbuf * m)452 ip_input(struct mbuf *m)
453 {
454 struct rm_priotracker in_ifa_tracker;
455 struct ip *ip = NULL;
456 struct in_ifaddr *ia = NULL;
457 struct ifaddr *ifa;
458 struct ifnet *ifp;
459 int checkif, hlen = 0;
460 uint16_t sum, ip_len;
461 int dchg = 0; /* dest changed after fw */
462 struct in_addr odst; /* original dst address */
463
464 M_ASSERTPKTHDR(m);
465 NET_EPOCH_ASSERT();
466
467 if (m->m_flags & M_FASTFWD_OURS) {
468 m->m_flags &= ~M_FASTFWD_OURS;
469 /* Set up some basics that will be used later. */
470 ip = mtod(m, struct ip *);
471 hlen = ip->ip_hl << 2;
472 ip_len = ntohs(ip->ip_len);
473 goto ours;
474 }
475
476 IPSTAT_INC(ips_total);
477
478 if (m->m_pkthdr.len < sizeof(struct ip))
479 goto tooshort;
480
481 if (m->m_len < sizeof (struct ip) &&
482 (m = m_pullup(m, sizeof (struct ip))) == NULL) {
483 IPSTAT_INC(ips_toosmall);
484 return;
485 }
486 ip = mtod(m, struct ip *);
487
488 if (ip->ip_v != IPVERSION) {
489 IPSTAT_INC(ips_badvers);
490 goto bad;
491 }
492
493 hlen = ip->ip_hl << 2;
494 if (hlen < sizeof(struct ip)) { /* minimum header length */
495 IPSTAT_INC(ips_badhlen);
496 goto bad;
497 }
498 if (hlen > m->m_len) {
499 if ((m = m_pullup(m, hlen)) == NULL) {
500 IPSTAT_INC(ips_badhlen);
501 return;
502 }
503 ip = mtod(m, struct ip *);
504 }
505
506 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
507
508 /* IN_LOOPBACK must not appear on the wire - RFC1122 */
509 ifp = m->m_pkthdr.rcvif;
510 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
511 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
512 if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
513 IPSTAT_INC(ips_badaddr);
514 goto bad;
515 }
516 }
517
518 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
519 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
520 } else {
521 if (hlen == sizeof(struct ip)) {
522 sum = in_cksum_hdr(ip);
523 } else {
524 sum = in_cksum(m, hlen);
525 }
526 }
527 if (sum) {
528 IPSTAT_INC(ips_badsum);
529 goto bad;
530 }
531
532 #ifdef ALTQ
533 if (altq_input != NULL && (*altq_input)(m, AF_INET) == 0)
534 /* packet is dropped by traffic conditioner */
535 return;
536 #endif
537
538 ip_len = ntohs(ip->ip_len);
539 if (ip_len < hlen) {
540 IPSTAT_INC(ips_badlen);
541 goto bad;
542 }
543
544 /*
545 * Check that the amount of data in the buffers
546 * is as at least much as the IP header would have us expect.
547 * Trim mbufs if longer than we expect.
548 * Drop packet if shorter than we expect.
549 */
550 if (m->m_pkthdr.len < ip_len) {
551 tooshort:
552 IPSTAT_INC(ips_tooshort);
553 goto bad;
554 }
555 if (m->m_pkthdr.len > ip_len) {
556 if (m->m_len == m->m_pkthdr.len) {
557 m->m_len = ip_len;
558 m->m_pkthdr.len = ip_len;
559 } else
560 m_adj(m, ip_len - m->m_pkthdr.len);
561 }
562
563 /*
564 * Try to forward the packet, but if we fail continue.
565 * ip_tryforward() does not generate redirects, so fall
566 * through to normal processing if redirects are required.
567 * ip_tryforward() does inbound and outbound packet firewall
568 * processing. If firewall has decided that destination becomes
569 * our local address, it sets M_FASTFWD_OURS flag. In this
570 * case skip another inbound firewall processing and update
571 * ip pointer.
572 */
573 if (V_ipforwarding != 0
574 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
575 && (!IPSEC_ENABLED(ipv4) ||
576 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0)
577 #endif
578 ) {
579 if ((m = ip_tryforward(m)) == NULL)
580 return;
581 if (m->m_flags & M_FASTFWD_OURS) {
582 m->m_flags &= ~M_FASTFWD_OURS;
583 ip = mtod(m, struct ip *);
584 goto ours;
585 }
586 }
587
588 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
589 /*
590 * Bypass packet filtering for packets previously handled by IPsec.
591 */
592 if (IPSEC_ENABLED(ipv4) &&
593 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0)
594 goto passin;
595 #endif
596
597 /*
598 * Run through list of hooks for input packets.
599 *
600 * NB: Beware of the destination address changing (e.g.
601 * by NAT rewriting). When this happens, tell
602 * ip_forward to do the right thing.
603 */
604
605 /* Jump over all PFIL processing if hooks are not active. */
606 if (!PFIL_HOOKED_IN(V_inet_pfil_head))
607 goto passin;
608
609 odst = ip->ip_dst;
610 if (pfil_run_hooks(V_inet_pfil_head, &m, ifp, PFIL_IN, NULL) !=
611 PFIL_PASS)
612 return;
613 if (m == NULL) /* consumed by filter */
614 return;
615
616 ip = mtod(m, struct ip *);
617 dchg = (odst.s_addr != ip->ip_dst.s_addr);
618 ifp = m->m_pkthdr.rcvif;
619
620 if (m->m_flags & M_FASTFWD_OURS) {
621 m->m_flags &= ~M_FASTFWD_OURS;
622 goto ours;
623 }
624 if (m->m_flags & M_IP_NEXTHOP) {
625 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
626 /*
627 * Directly ship the packet on. This allows
628 * forwarding packets originally destined to us
629 * to some other directly connected host.
630 */
631 ip_forward(m, 1);
632 return;
633 }
634 }
635 passin:
636
637 /*
638 * Process options and, if not destined for us,
639 * ship it on. ip_dooptions returns 1 when an
640 * error was detected (causing an icmp message
641 * to be sent and the original packet to be freed).
642 */
643 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0))
644 return;
645
646 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
647 * matter if it is destined to another node, or whether it is
648 * a multicast one, RSVP wants it! and prevents it from being forwarded
649 * anywhere else. Also checks if the rsvp daemon is running before
650 * grabbing the packet.
651 */
652 if (V_rsvp_on && ip->ip_p==IPPROTO_RSVP)
653 goto ours;
654
655 /*
656 * Check our list of addresses, to see if the packet is for us.
657 * If we don't have any addresses, assume any unicast packet
658 * we receive might be for us (and let the upper layers deal
659 * with it).
660 */
661 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) &&
662 (m->m_flags & (M_MCAST|M_BCAST)) == 0)
663 goto ours;
664
665 /*
666 * Enable a consistency check between the destination address
667 * and the arrival interface for a unicast packet (the RFC 1122
668 * strong ES model) if IP forwarding is disabled and the packet
669 * is not locally generated and the packet is not subject to
670 * 'ipfw fwd'.
671 *
672 * XXX - Checking also should be disabled if the destination
673 * address is ipnat'ed to a different interface.
674 *
675 * XXX - Checking is incompatible with IP aliases added
676 * to the loopback interface instead of the interface where
677 * the packets are received.
678 *
679 * XXX - This is the case for carp vhost IPs as well so we
680 * insert a workaround. If the packet got here, we already
681 * checked with carp_iamatch() and carp_forus().
682 */
683 checkif = V_ip_checkinterface && (V_ipforwarding == 0) &&
684 ifp != NULL && ((ifp->if_flags & IFF_LOOPBACK) == 0) &&
685 ifp->if_carp == NULL && (dchg == 0);
686
687 /*
688 * Check for exact addresses in the hash bucket.
689 */
690 IN_IFADDR_RLOCK(&in_ifa_tracker);
691 LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
692 /*
693 * If the address matches, verify that the packet
694 * arrived via the correct interface if checking is
695 * enabled.
696 */
697 if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr &&
698 (!checkif || ia->ia_ifp == ifp)) {
699 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
700 counter_u64_add(ia->ia_ifa.ifa_ibytes,
701 m->m_pkthdr.len);
702 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
703 goto ours;
704 }
705 }
706 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
707
708 /*
709 * Check for broadcast addresses.
710 *
711 * Only accept broadcast packets that arrive via the matching
712 * interface. Reception of forwarded directed broadcasts would
713 * be handled via ip_forward() and ether_output() with the loopback
714 * into the stack for SIMPLEX interfaces handled by ether_output().
715 */
716 if (ifp != NULL && ifp->if_flags & IFF_BROADCAST) {
717 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
718 if (ifa->ifa_addr->sa_family != AF_INET)
719 continue;
720 ia = ifatoia(ifa);
721 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
722 ip->ip_dst.s_addr) {
723 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
724 counter_u64_add(ia->ia_ifa.ifa_ibytes,
725 m->m_pkthdr.len);
726 goto ours;
727 }
728 #ifdef BOOTP_COMPAT
729 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
730 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
731 counter_u64_add(ia->ia_ifa.ifa_ibytes,
732 m->m_pkthdr.len);
733 goto ours;
734 }
735 #endif
736 }
737 ia = NULL;
738 }
739 /* RFC 3927 2.7: Do not forward datagrams for 169.254.0.0/16. */
740 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
741 IPSTAT_INC(ips_cantforward);
742 m_freem(m);
743 return;
744 }
745 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
746 if (V_ip_mrouter) {
747 /*
748 * If we are acting as a multicast router, all
749 * incoming multicast packets are passed to the
750 * kernel-level multicast forwarding function.
751 * The packet is returned (relatively) intact; if
752 * ip_mforward() returns a non-zero value, the packet
753 * must be discarded, else it may be accepted below.
754 */
755 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
756 IPSTAT_INC(ips_cantforward);
757 m_freem(m);
758 return;
759 }
760
761 /*
762 * The process-level routing daemon needs to receive
763 * all multicast IGMP packets, whether or not this
764 * host belongs to their destination groups.
765 */
766 if (ip->ip_p == IPPROTO_IGMP)
767 goto ours;
768 IPSTAT_INC(ips_forward);
769 }
770 /*
771 * Assume the packet is for us, to avoid prematurely taking
772 * a lock on the in_multi hash. Protocols must perform
773 * their own filtering and update statistics accordingly.
774 */
775 goto ours;
776 }
777 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
778 goto ours;
779 if (ip->ip_dst.s_addr == INADDR_ANY)
780 goto ours;
781
782 /*
783 * Not for us; forward if possible and desirable.
784 */
785 if (V_ipforwarding == 0) {
786 IPSTAT_INC(ips_cantforward);
787 m_freem(m);
788 } else {
789 ip_forward(m, dchg);
790 }
791 return;
792
793 ours:
794 #ifdef IPSTEALTH
795 /*
796 * IPSTEALTH: Process non-routing options only
797 * if the packet is destined for us.
798 */
799 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1))
800 return;
801 #endif /* IPSTEALTH */
802
803 /*
804 * Attempt reassembly; if it succeeds, proceed.
805 * ip_reass() will return a different mbuf.
806 */
807 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
808 /* XXXGL: shouldn't we save & set m_flags? */
809 m = ip_reass(m);
810 if (m == NULL)
811 return;
812 ip = mtod(m, struct ip *);
813 /* Get the header length of the reassembled packet */
814 hlen = ip->ip_hl << 2;
815 }
816
817 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
818 if (IPSEC_ENABLED(ipv4)) {
819 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
820 return;
821 }
822 #endif /* IPSEC */
823
824 /*
825 * Switch out to protocol's input routine.
826 */
827 IPSTAT_INC(ips_delivered);
828
829 (*inetsw[ip_protox[ip->ip_p]].pr_input)(&m, &hlen, ip->ip_p);
830 return;
831 bad:
832 m_freem(m);
833 }
834
835 /*
836 * IP timer processing;
837 * if a timer expires on a reassembly
838 * queue, discard it.
839 */
840 void
ip_slowtimo(void)841 ip_slowtimo(void)
842 {
843 VNET_ITERATOR_DECL(vnet_iter);
844
845 VNET_LIST_RLOCK_NOSLEEP();
846 VNET_FOREACH(vnet_iter) {
847 CURVNET_SET(vnet_iter);
848 ipreass_slowtimo();
849 CURVNET_RESTORE();
850 }
851 VNET_LIST_RUNLOCK_NOSLEEP();
852 }
853
854 void
ip_drain(void)855 ip_drain(void)
856 {
857 VNET_ITERATOR_DECL(vnet_iter);
858
859 VNET_LIST_RLOCK_NOSLEEP();
860 VNET_FOREACH(vnet_iter) {
861 CURVNET_SET(vnet_iter);
862 ipreass_drain();
863 CURVNET_RESTORE();
864 }
865 VNET_LIST_RUNLOCK_NOSLEEP();
866 }
867
868 /*
869 * The protocol to be inserted into ip_protox[] must be already registered
870 * in inetsw[], either statically or through pf_proto_register().
871 */
872 int
ipproto_register(short ipproto)873 ipproto_register(short ipproto)
874 {
875 struct protosw *pr;
876
877 /* Sanity checks. */
878 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
879 return (EPROTONOSUPPORT);
880
881 /*
882 * The protocol slot must not be occupied by another protocol
883 * already. An index pointing to IPPROTO_RAW is unused.
884 */
885 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
886 if (pr == NULL)
887 return (EPFNOSUPPORT);
888 if (ip_protox[ipproto] != pr - inetsw) /* IPPROTO_RAW */
889 return (EEXIST);
890
891 /* Find the protocol position in inetsw[] and set the index. */
892 for (pr = inetdomain.dom_protosw;
893 pr < inetdomain.dom_protoswNPROTOSW; pr++) {
894 if (pr->pr_domain->dom_family == PF_INET &&
895 pr->pr_protocol && pr->pr_protocol == ipproto) {
896 ip_protox[pr->pr_protocol] = pr - inetsw;
897 return (0);
898 }
899 }
900 return (EPROTONOSUPPORT);
901 }
902
903 int
ipproto_unregister(short ipproto)904 ipproto_unregister(short ipproto)
905 {
906 struct protosw *pr;
907
908 /* Sanity checks. */
909 if (ipproto <= 0 || ipproto >= IPPROTO_MAX)
910 return (EPROTONOSUPPORT);
911
912 /* Check if the protocol was indeed registered. */
913 pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
914 if (pr == NULL)
915 return (EPFNOSUPPORT);
916 if (ip_protox[ipproto] == pr - inetsw) /* IPPROTO_RAW */
917 return (ENOENT);
918
919 /* Reset the protocol slot to IPPROTO_RAW. */
920 ip_protox[ipproto] = pr - inetsw;
921 return (0);
922 }
923
924 u_char inetctlerrmap[PRC_NCMDS] = {
925 0, 0, 0, 0,
926 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
927 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
928 EMSGSIZE, EHOSTUNREACH, 0, 0,
929 0, 0, EHOSTUNREACH, 0,
930 ENOPROTOOPT, ECONNREFUSED
931 };
932
933 /*
934 * Forward a packet. If some error occurs return the sender
935 * an icmp packet. Note we can't always generate a meaningful
936 * icmp message because icmp doesn't have a large enough repertoire
937 * of codes and types.
938 *
939 * If not forwarding, just drop the packet. This could be confusing
940 * if ipforwarding was zero but some routing protocol was advancing
941 * us as a gateway to somewhere. However, we must let the routing
942 * protocol deal with that.
943 *
944 * The srcrt parameter indicates whether the packet is being forwarded
945 * via a source route.
946 */
947 void
ip_forward(struct mbuf * m,int srcrt)948 ip_forward(struct mbuf *m, int srcrt)
949 {
950 struct ip *ip = mtod(m, struct ip *);
951 struct in_ifaddr *ia;
952 struct mbuf *mcopy;
953 struct sockaddr_in *sin;
954 struct in_addr dest;
955 struct route ro;
956 uint32_t flowid;
957 int error, type = 0, code = 0, mtu = 0;
958
959 NET_EPOCH_ASSERT();
960
961 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
962 IPSTAT_INC(ips_cantforward);
963 m_freem(m);
964 return;
965 }
966 if (
967 #ifdef IPSTEALTH
968 V_ipstealth == 0 &&
969 #endif
970 ip->ip_ttl <= IPTTLDEC) {
971 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0);
972 return;
973 }
974
975 bzero(&ro, sizeof(ro));
976 sin = (struct sockaddr_in *)&ro.ro_dst;
977 sin->sin_family = AF_INET;
978 sin->sin_len = sizeof(*sin);
979 sin->sin_addr = ip->ip_dst;
980 flowid = m->m_pkthdr.flowid;
981 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid);
982 if (ro.ro_nh != NULL) {
983 ia = ifatoia(ro.ro_nh->nh_ifa);
984 } else
985 ia = NULL;
986 /*
987 * Save the IP header and at most 8 bytes of the payload,
988 * in case we need to generate an ICMP message to the src.
989 *
990 * XXX this can be optimized a lot by saving the data in a local
991 * buffer on the stack (72 bytes at most), and only allocating the
992 * mbuf if really necessary. The vast majority of the packets
993 * are forwarded without having to send an ICMP back (either
994 * because unnecessary, or because rate limited), so we are
995 * really we are wasting a lot of work here.
996 *
997 * We don't use m_copym() because it might return a reference
998 * to a shared cluster. Both this function and ip_output()
999 * assume exclusive access to the IP header in `m', so any
1000 * data in a cluster may change before we reach icmp_error().
1001 */
1002 mcopy = m_gethdr(M_NOWAIT, m->m_type);
1003 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) {
1004 /*
1005 * It's probably ok if the pkthdr dup fails (because
1006 * the deep copy of the tag chain failed), but for now
1007 * be conservative and just discard the copy since
1008 * code below may some day want the tags.
1009 */
1010 m_free(mcopy);
1011 mcopy = NULL;
1012 }
1013 if (mcopy != NULL) {
1014 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
1015 mcopy->m_pkthdr.len = mcopy->m_len;
1016 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
1017 }
1018 #ifdef IPSTEALTH
1019 if (V_ipstealth == 0)
1020 #endif
1021 ip->ip_ttl -= IPTTLDEC;
1022 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1023 if (IPSEC_ENABLED(ipv4)) {
1024 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) {
1025 /* mbuf consumed by IPsec */
1026 RO_NHFREE(&ro);
1027 m_freem(mcopy);
1028 if (error != EINPROGRESS)
1029 IPSTAT_INC(ips_cantforward);
1030 return;
1031 }
1032 /* No IPsec processing required */
1033 }
1034 #endif /* IPSEC */
1035 /*
1036 * If forwarding packet using same interface that it came in on,
1037 * perhaps should send a redirect to sender to shortcut a hop.
1038 * Only send redirect if source is sending directly to us,
1039 * and if packet was not source routed (or has any options).
1040 * Also, don't send redirect if forwarding using a default route
1041 * or a route modified by a redirect.
1042 */
1043 dest.s_addr = 0;
1044 if (!srcrt && V_ipsendredirects &&
1045 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
1046 struct nhop_object *nh;
1047
1048 nh = ro.ro_nh;
1049
1050 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) {
1051 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa);
1052 u_long src = ntohl(ip->ip_src.s_addr);
1053
1054 if (nh_ia != NULL &&
1055 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) {
1056 if (nh->nh_flags & NHF_GATEWAY)
1057 dest.s_addr = nh->gw4_sa.sin_addr.s_addr;
1058 else
1059 dest.s_addr = ip->ip_dst.s_addr;
1060 /* Router requirements says to only send host redirects */
1061 type = ICMP_REDIRECT;
1062 code = ICMP_REDIRECT_HOST;
1063 }
1064 }
1065 }
1066
1067 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
1068
1069 if (error == EMSGSIZE && ro.ro_nh)
1070 mtu = ro.ro_nh->nh_mtu;
1071 RO_NHFREE(&ro);
1072
1073 if (error)
1074 IPSTAT_INC(ips_cantforward);
1075 else {
1076 IPSTAT_INC(ips_forward);
1077 if (type)
1078 IPSTAT_INC(ips_redirectsent);
1079 else {
1080 if (mcopy)
1081 m_freem(mcopy);
1082 return;
1083 }
1084 }
1085 if (mcopy == NULL)
1086 return;
1087
1088 switch (error) {
1089 case 0: /* forwarded, but need redirect */
1090 /* type, code set above */
1091 break;
1092
1093 case ENETUNREACH:
1094 case EHOSTUNREACH:
1095 case ENETDOWN:
1096 case EHOSTDOWN:
1097 default:
1098 type = ICMP_UNREACH;
1099 code = ICMP_UNREACH_HOST;
1100 break;
1101
1102 case EMSGSIZE:
1103 type = ICMP_UNREACH;
1104 code = ICMP_UNREACH_NEEDFRAG;
1105 /*
1106 * If the MTU was set before make sure we are below the
1107 * interface MTU.
1108 * If the MTU wasn't set before use the interface mtu or
1109 * fall back to the next smaller mtu step compared to the
1110 * current packet size.
1111 */
1112 if (mtu != 0) {
1113 if (ia != NULL)
1114 mtu = min(mtu, ia->ia_ifp->if_mtu);
1115 } else {
1116 if (ia != NULL)
1117 mtu = ia->ia_ifp->if_mtu;
1118 else
1119 mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
1120 }
1121 IPSTAT_INC(ips_cantfrag);
1122 break;
1123
1124 case ENOBUFS:
1125 case EACCES: /* ipfw denied packet */
1126 m_freem(mcopy);
1127 return;
1128 }
1129 icmp_error(mcopy, type, code, dest.s_addr, mtu);
1130 }
1131
1132 #define CHECK_SO_CT(sp, ct) \
1133 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0)
1134
1135 void
ip_savecontrol(struct inpcb * inp,struct mbuf ** mp,struct ip * ip,struct mbuf * m)1136 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
1137 struct mbuf *m)
1138 {
1139 bool stamped;
1140
1141 stamped = false;
1142 if ((inp->inp_socket->so_options & SO_BINTIME) ||
1143 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) {
1144 struct bintime boottimebin, bt;
1145 struct timespec ts1;
1146
1147 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1148 M_TSTMP)) {
1149 mbuf_tstmp2timespec(m, &ts1);
1150 timespec2bintime(&ts1, &bt);
1151 getboottimebin(&boottimebin);
1152 bintime_add(&bt, &boottimebin);
1153 } else {
1154 bintime(&bt);
1155 }
1156 *mp = sbcreatecontrol((caddr_t)&bt, sizeof(bt),
1157 SCM_BINTIME, SOL_SOCKET);
1158 if (*mp != NULL) {
1159 mp = &(*mp)->m_next;
1160 stamped = true;
1161 }
1162 }
1163 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) {
1164 struct bintime boottimebin, bt1;
1165 struct timespec ts1;
1166 struct timeval tv;
1167
1168 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1169 M_TSTMP)) {
1170 mbuf_tstmp2timespec(m, &ts1);
1171 timespec2bintime(&ts1, &bt1);
1172 getboottimebin(&boottimebin);
1173 bintime_add(&bt1, &boottimebin);
1174 bintime2timeval(&bt1, &tv);
1175 } else {
1176 microtime(&tv);
1177 }
1178 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv),
1179 SCM_TIMESTAMP, SOL_SOCKET);
1180 if (*mp != NULL) {
1181 mp = &(*mp)->m_next;
1182 stamped = true;
1183 }
1184 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) {
1185 struct bintime boottimebin;
1186 struct timespec ts, ts1;
1187
1188 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1189 M_TSTMP)) {
1190 mbuf_tstmp2timespec(m, &ts);
1191 getboottimebin(&boottimebin);
1192 bintime2timespec(&boottimebin, &ts1);
1193 timespecadd(&ts, &ts1, &ts);
1194 } else {
1195 nanotime(&ts);
1196 }
1197 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts),
1198 SCM_REALTIME, SOL_SOCKET);
1199 if (*mp != NULL) {
1200 mp = &(*mp)->m_next;
1201 stamped = true;
1202 }
1203 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) {
1204 struct timespec ts;
1205
1206 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1207 M_TSTMP))
1208 mbuf_tstmp2timespec(m, &ts);
1209 else
1210 nanouptime(&ts);
1211 *mp = sbcreatecontrol((caddr_t)&ts, sizeof(ts),
1212 SCM_MONOTONIC, SOL_SOCKET);
1213 if (*mp != NULL) {
1214 mp = &(*mp)->m_next;
1215 stamped = true;
1216 }
1217 }
1218 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
1219 M_TSTMP)) {
1220 struct sock_timestamp_info sti;
1221
1222 bzero(&sti, sizeof(sti));
1223 sti.st_info_flags = ST_INFO_HW;
1224 if ((m->m_flags & M_TSTMP_HPREC) != 0)
1225 sti.st_info_flags |= ST_INFO_HW_HPREC;
1226 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), SCM_TIME_INFO,
1227 SOL_SOCKET);
1228 if (*mp != NULL)
1229 mp = &(*mp)->m_next;
1230 }
1231 if (inp->inp_flags & INP_RECVDSTADDR) {
1232 *mp = sbcreatecontrol((caddr_t)&ip->ip_dst,
1233 sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
1234 if (*mp)
1235 mp = &(*mp)->m_next;
1236 }
1237 if (inp->inp_flags & INP_RECVTTL) {
1238 *mp = sbcreatecontrol((caddr_t)&ip->ip_ttl,
1239 sizeof(u_char), IP_RECVTTL, IPPROTO_IP);
1240 if (*mp)
1241 mp = &(*mp)->m_next;
1242 }
1243 #ifdef notyet
1244 /* XXX
1245 * Moving these out of udp_input() made them even more broken
1246 * than they already were.
1247 */
1248 /* options were tossed already */
1249 if (inp->inp_flags & INP_RECVOPTS) {
1250 *mp = sbcreatecontrol((caddr_t)opts_deleted_above,
1251 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP);
1252 if (*mp)
1253 mp = &(*mp)->m_next;
1254 }
1255 /* ip_srcroute doesn't do what we want here, need to fix */
1256 if (inp->inp_flags & INP_RECVRETOPTS) {
1257 *mp = sbcreatecontrol((caddr_t)ip_srcroute(m),
1258 sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP);
1259 if (*mp)
1260 mp = &(*mp)->m_next;
1261 }
1262 #endif
1263 if (inp->inp_flags & INP_RECVIF) {
1264 struct ifnet *ifp;
1265 struct sdlbuf {
1266 struct sockaddr_dl sdl;
1267 u_char pad[32];
1268 } sdlbuf;
1269 struct sockaddr_dl *sdp;
1270 struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
1271
1272 if ((ifp = m->m_pkthdr.rcvif) &&
1273 ifp->if_index && ifp->if_index <= V_if_index) {
1274 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
1275 /*
1276 * Change our mind and don't try copy.
1277 */
1278 if (sdp->sdl_family != AF_LINK ||
1279 sdp->sdl_len > sizeof(sdlbuf)) {
1280 goto makedummy;
1281 }
1282 bcopy(sdp, sdl2, sdp->sdl_len);
1283 } else {
1284 makedummy:
1285 sdl2->sdl_len =
1286 offsetof(struct sockaddr_dl, sdl_data[0]);
1287 sdl2->sdl_family = AF_LINK;
1288 sdl2->sdl_index = 0;
1289 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
1290 }
1291 *mp = sbcreatecontrol((caddr_t)sdl2, sdl2->sdl_len,
1292 IP_RECVIF, IPPROTO_IP);
1293 if (*mp)
1294 mp = &(*mp)->m_next;
1295 }
1296 if (inp->inp_flags & INP_RECVTOS) {
1297 *mp = sbcreatecontrol((caddr_t)&ip->ip_tos,
1298 sizeof(u_char), IP_RECVTOS, IPPROTO_IP);
1299 if (*mp)
1300 mp = &(*mp)->m_next;
1301 }
1302
1303 if (inp->inp_flags2 & INP_RECVFLOWID) {
1304 uint32_t flowid, flow_type;
1305
1306 flowid = m->m_pkthdr.flowid;
1307 flow_type = M_HASHTYPE_GET(m);
1308
1309 /*
1310 * XXX should handle the failure of one or the
1311 * other - don't populate both?
1312 */
1313 *mp = sbcreatecontrol((caddr_t) &flowid,
1314 sizeof(uint32_t), IP_FLOWID, IPPROTO_IP);
1315 if (*mp)
1316 mp = &(*mp)->m_next;
1317 *mp = sbcreatecontrol((caddr_t) &flow_type,
1318 sizeof(uint32_t), IP_FLOWTYPE, IPPROTO_IP);
1319 if (*mp)
1320 mp = &(*mp)->m_next;
1321 }
1322
1323 #ifdef RSS
1324 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
1325 uint32_t flowid, flow_type;
1326 uint32_t rss_bucketid;
1327
1328 flowid = m->m_pkthdr.flowid;
1329 flow_type = M_HASHTYPE_GET(m);
1330
1331 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
1332 *mp = sbcreatecontrol((caddr_t) &rss_bucketid,
1333 sizeof(uint32_t), IP_RSSBUCKETID, IPPROTO_IP);
1334 if (*mp)
1335 mp = &(*mp)->m_next;
1336 }
1337 }
1338 #endif
1339 }
1340
1341 /*
1342 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
1343 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
1344 * locking. This code remains in ip_input.c as ip_mroute.c is optionally
1345 * compiled.
1346 */
1347 VNET_DEFINE_STATIC(int, ip_rsvp_on);
1348 VNET_DEFINE(struct socket *, ip_rsvpd);
1349
1350 #define V_ip_rsvp_on VNET(ip_rsvp_on)
1351
1352 int
ip_rsvp_init(struct socket * so)1353 ip_rsvp_init(struct socket *so)
1354 {
1355
1356 if (so->so_type != SOCK_RAW ||
1357 so->so_proto->pr_protocol != IPPROTO_RSVP)
1358 return EOPNOTSUPP;
1359
1360 if (V_ip_rsvpd != NULL)
1361 return EADDRINUSE;
1362
1363 V_ip_rsvpd = so;
1364 /*
1365 * This may seem silly, but we need to be sure we don't over-increment
1366 * the RSVP counter, in case something slips up.
1367 */
1368 if (!V_ip_rsvp_on) {
1369 V_ip_rsvp_on = 1;
1370 V_rsvp_on++;
1371 }
1372
1373 return 0;
1374 }
1375
1376 int
ip_rsvp_done(void)1377 ip_rsvp_done(void)
1378 {
1379
1380 V_ip_rsvpd = NULL;
1381 /*
1382 * This may seem silly, but we need to be sure we don't over-decrement
1383 * the RSVP counter, in case something slips up.
1384 */
1385 if (V_ip_rsvp_on) {
1386 V_ip_rsvp_on = 0;
1387 V_rsvp_on--;
1388 }
1389 return 0;
1390 }
1391
1392 int
rsvp_input(struct mbuf ** mp,int * offp,int proto)1393 rsvp_input(struct mbuf **mp, int *offp, int proto)
1394 {
1395 struct mbuf *m;
1396
1397 m = *mp;
1398 *mp = NULL;
1399
1400 if (rsvp_input_p) { /* call the real one if loaded */
1401 *mp = m;
1402 rsvp_input_p(mp, offp, proto);
1403 return (IPPROTO_DONE);
1404 }
1405
1406 /* Can still get packets with rsvp_on = 0 if there is a local member
1407 * of the group to which the RSVP packet is addressed. But in this
1408 * case we want to throw the packet away.
1409 */
1410
1411 if (!V_rsvp_on) {
1412 m_freem(m);
1413 return (IPPROTO_DONE);
1414 }
1415
1416 if (V_ip_rsvpd != NULL) {
1417 *mp = m;
1418 rip_input(mp, offp, proto);
1419 return (IPPROTO_DONE);
1420 }
1421 /* Drop the packet */
1422 m_freem(m);
1423 return (IPPROTO_DONE);
1424 }
1425