1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989 Stephen Deering
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Stephen Deering of Stanford University.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
36 */
37
38 /*
39 * IP multicast forwarding procedures
40 *
41 * Written by David Waitzman, BBN Labs, August 1988.
42 * Modified by Steve Deering, Stanford, February 1989.
43 * Modified by Mark J. Steiglitz, Stanford, May, 1991
44 * Modified by Van Jacobson, LBL, January 1993
45 * Modified by Ajit Thyagarajan, PARC, August 1993
46 * Modified by Bill Fenner, PARC, April 1995
47 * Modified by Ahmed Helmy, SGI, June 1996
48 * Modified by George Edmond Eddy (Rusty), ISI, February 1998
49 * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000
50 * Modified by Hitoshi Asaeda, WIDE, August 2000
51 * Modified by Pavlin Radoslavov, ICSI, October 2002
52 *
53 * MROUTING Revision: 3.5
54 * and PIM-SMv2 and PIM-DM support, advanced API support,
55 * bandwidth metering and signaling
56 */
57
58 /*
59 * TODO: Prefix functions with ipmf_.
60 * TODO: Maintain a refcount on if_allmulti() in ifnet or in the protocol
61 * domain attachment (if_afdata) so we can track consumers of that service.
62 * TODO: Deprecate routing socket path for SIOCGETSGCNT and SIOCGETVIFCNT,
63 * move it to socket options.
64 * TODO: Cleanup LSRR removal further.
65 * TODO: Push RSVP stubs into raw_ip.c.
66 * TODO: Use bitstring.h for vif set.
67 * TODO: Fix mrt6_ioctl dangling ref when dynamically loaded.
68 * TODO: Sync ip6_mroute.c with this file.
69 */
70
71 #include <sys/cdefs.h>
72 __FBSDID("$FreeBSD$");
73
74 #include "opt_inet.h"
75 #include "opt_mrouting.h"
76
77 #define _PIM_VT 1
78
79 #include <sys/param.h>
80 #include <sys/kernel.h>
81 #include <sys/stddef.h>
82 #include <sys/eventhandler.h>
83 #include <sys/lock.h>
84 #include <sys/ktr.h>
85 #include <sys/malloc.h>
86 #include <sys/mbuf.h>
87 #include <sys/module.h>
88 #include <sys/priv.h>
89 #include <sys/protosw.h>
90 #include <sys/signalvar.h>
91 #include <sys/socket.h>
92 #include <sys/socketvar.h>
93 #include <sys/sockio.h>
94 #include <sys/sx.h>
95 #include <sys/sysctl.h>
96 #include <sys/syslog.h>
97 #include <sys/systm.h>
98 #include <sys/time.h>
99 #include <sys/counter.h>
100
101 #include <net/if.h>
102 #include <net/if_var.h>
103 #include <net/netisr.h>
104 #include <net/route.h>
105 #include <net/vnet.h>
106
107 #include <netinet/in.h>
108 #include <netinet/igmp.h>
109 #include <netinet/in_systm.h>
110 #include <netinet/in_var.h>
111 #include <netinet/ip.h>
112 #include <netinet/ip_encap.h>
113 #include <netinet/ip_mroute.h>
114 #include <netinet/ip_var.h>
115 #include <netinet/ip_options.h>
116 #include <netinet/pim.h>
117 #include <netinet/pim_var.h>
118 #include <netinet/udp.h>
119
120 #include <machine/in_cksum.h>
121
122 #ifndef KTR_IPMF
123 #define KTR_IPMF KTR_INET
124 #endif
125
126 #define VIFI_INVALID ((vifi_t) -1)
127
128 VNET_DEFINE_STATIC(uint32_t, last_tv_sec); /* last time we processed this */
129 #define V_last_tv_sec VNET(last_tv_sec)
130
131 static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast forwarding cache");
132
133 /*
134 * Locking. We use two locks: one for the virtual interface table and
135 * one for the forwarding table. These locks may be nested in which case
136 * the VIF lock must always be taken first. Note that each lock is used
137 * to cover not only the specific data structure but also related data
138 * structures.
139 */
140
141 static struct mtx mrouter_mtx;
142 #define MROUTER_LOCK() mtx_lock(&mrouter_mtx)
143 #define MROUTER_UNLOCK() mtx_unlock(&mrouter_mtx)
144 #define MROUTER_LOCK_ASSERT() mtx_assert(&mrouter_mtx, MA_OWNED)
145 #define MROUTER_LOCK_INIT() \
146 mtx_init(&mrouter_mtx, "IPv4 multicast forwarding", NULL, MTX_DEF)
147 #define MROUTER_LOCK_DESTROY() mtx_destroy(&mrouter_mtx)
148
149 static int ip_mrouter_cnt; /* # of vnets with active mrouters */
150 static int ip_mrouter_unloading; /* Allow no more V_ip_mrouter sockets */
151
152 VNET_PCPUSTAT_DEFINE_STATIC(struct mrtstat, mrtstat);
153 VNET_PCPUSTAT_SYSINIT(mrtstat);
154 VNET_PCPUSTAT_SYSUNINIT(mrtstat);
155 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, OID_AUTO, mrtstat, struct mrtstat,
156 mrtstat, "IPv4 Multicast Forwarding Statistics (struct mrtstat, "
157 "netinet/ip_mroute.h)");
158
159 VNET_DEFINE_STATIC(u_long, mfchash);
160 #define V_mfchash VNET(mfchash)
161 #define MFCHASH(a, g) \
162 ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \
163 ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & V_mfchash)
164 #define MFCHASHSIZE 256
165
166 static u_long mfchashsize; /* Hash size */
167 VNET_DEFINE_STATIC(u_char *, nexpire); /* 0..mfchashsize-1 */
168 #define V_nexpire VNET(nexpire)
169 VNET_DEFINE_STATIC(LIST_HEAD(mfchashhdr, mfc)*, mfchashtbl);
170 #define V_mfchashtbl VNET(mfchashtbl)
171
172 static struct mtx mfc_mtx;
173 #define MFC_LOCK() mtx_lock(&mfc_mtx)
174 #define MFC_UNLOCK() mtx_unlock(&mfc_mtx)
175 #define MFC_LOCK_ASSERT() mtx_assert(&mfc_mtx, MA_OWNED)
176 #define MFC_LOCK_INIT() \
177 mtx_init(&mfc_mtx, "IPv4 multicast forwarding cache", NULL, MTX_DEF)
178 #define MFC_LOCK_DESTROY() mtx_destroy(&mfc_mtx)
179
180 VNET_DEFINE_STATIC(vifi_t, numvifs);
181 #define V_numvifs VNET(numvifs)
182 VNET_DEFINE_STATIC(struct vif, viftable[MAXVIFS]);
183 #define V_viftable VNET(viftable)
184 SYSCTL_OPAQUE(_net_inet_ip, OID_AUTO, viftable, CTLFLAG_VNET | CTLFLAG_RD,
185 &VNET_NAME(viftable), sizeof(V_viftable), "S,vif[MAXVIFS]",
186 "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
187
188 static struct mtx vif_mtx;
189 #define VIF_LOCK() mtx_lock(&vif_mtx)
190 #define VIF_UNLOCK() mtx_unlock(&vif_mtx)
191 #define VIF_LOCK_ASSERT() mtx_assert(&vif_mtx, MA_OWNED)
192 #define VIF_LOCK_INIT() \
193 mtx_init(&vif_mtx, "IPv4 multicast interfaces", NULL, MTX_DEF)
194 #define VIF_LOCK_DESTROY() mtx_destroy(&vif_mtx)
195
196 static eventhandler_tag if_detach_event_tag = NULL;
197
198 VNET_DEFINE_STATIC(struct callout, expire_upcalls_ch);
199 #define V_expire_upcalls_ch VNET(expire_upcalls_ch)
200
201 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
202 #define UPCALL_EXPIRE 6 /* number of timeouts */
203
204 /*
205 * Bandwidth meter variables and constants
206 */
207 static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters");
208 /*
209 * Pending timeouts are stored in a hash table, the key being the
210 * expiration time. Periodically, the entries are analysed and processed.
211 */
212 #define BW_METER_BUCKETS 1024
213 VNET_DEFINE_STATIC(struct bw_meter*, bw_meter_timers[BW_METER_BUCKETS]);
214 #define V_bw_meter_timers VNET(bw_meter_timers)
215 VNET_DEFINE_STATIC(struct callout, bw_meter_ch);
216 #define V_bw_meter_ch VNET(bw_meter_ch)
217 #define BW_METER_PERIOD (hz) /* periodical handling of bw meters */
218
219 /*
220 * Pending upcalls are stored in a vector which is flushed when
221 * full, or periodically
222 */
223 VNET_DEFINE_STATIC(struct bw_upcall, bw_upcalls[BW_UPCALLS_MAX]);
224 #define V_bw_upcalls VNET(bw_upcalls)
225 VNET_DEFINE_STATIC(u_int, bw_upcalls_n); /* # of pending upcalls */
226 #define V_bw_upcalls_n VNET(bw_upcalls_n)
227 VNET_DEFINE_STATIC(struct callout, bw_upcalls_ch);
228 #define V_bw_upcalls_ch VNET(bw_upcalls_ch)
229
230 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */
231
232 VNET_PCPUSTAT_DEFINE_STATIC(struct pimstat, pimstat);
233 VNET_PCPUSTAT_SYSINIT(pimstat);
234 VNET_PCPUSTAT_SYSUNINIT(pimstat);
235
236 SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM");
237 SYSCTL_VNET_PCPUSTAT(_net_inet_pim, PIMCTL_STATS, stats, struct pimstat,
238 pimstat, "PIM Statistics (struct pimstat, netinet/pim_var.h)");
239
240 static u_long pim_squelch_wholepkt = 0;
241 SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RW,
242 &pim_squelch_wholepkt, 0,
243 "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified");
244
245 static const struct encaptab *pim_encap_cookie;
246 static int pim_encapcheck(const struct mbuf *, int, int, void *);
247 static int pim_input(struct mbuf *, int, int, void *);
248
249 static const struct encap_config ipv4_encap_cfg = {
250 .proto = IPPROTO_PIM,
251 .min_length = sizeof(struct ip) + PIM_MINLEN,
252 .exact_match = 8,
253 .check = pim_encapcheck,
254 .input = pim_input
255 };
256
257 /*
258 * Note: the PIM Register encapsulation adds the following in front of a
259 * data packet:
260 *
261 * struct pim_encap_hdr {
262 * struct ip ip;
263 * struct pim_encap_pimhdr pim;
264 * }
265 *
266 */
267
268 struct pim_encap_pimhdr {
269 struct pim pim;
270 uint32_t flags;
271 };
272 #define PIM_ENCAP_TTL 64
273
274 static struct ip pim_encap_iphdr = {
275 #if BYTE_ORDER == LITTLE_ENDIAN
276 sizeof(struct ip) >> 2,
277 IPVERSION,
278 #else
279 IPVERSION,
280 sizeof(struct ip) >> 2,
281 #endif
282 0, /* tos */
283 sizeof(struct ip), /* total length */
284 0, /* id */
285 0, /* frag offset */
286 PIM_ENCAP_TTL,
287 IPPROTO_PIM,
288 0, /* checksum */
289 };
290
291 static struct pim_encap_pimhdr pim_encap_pimhdr = {
292 {
293 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */
294 0, /* reserved */
295 0, /* checksum */
296 },
297 0 /* flags */
298 };
299
300 VNET_DEFINE_STATIC(vifi_t, reg_vif_num) = VIFI_INVALID;
301 #define V_reg_vif_num VNET(reg_vif_num)
302 VNET_DEFINE_STATIC(struct ifnet, multicast_register_if);
303 #define V_multicast_register_if VNET(multicast_register_if)
304
305 /*
306 * Private variables.
307 */
308
309 static u_long X_ip_mcast_src(int);
310 static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *,
311 struct ip_moptions *);
312 static int X_ip_mrouter_done(void);
313 static int X_ip_mrouter_get(struct socket *, struct sockopt *);
314 static int X_ip_mrouter_set(struct socket *, struct sockopt *);
315 static int X_legal_vif_num(int);
316 static int X_mrt_ioctl(u_long, caddr_t, int);
317
318 static int add_bw_upcall(struct bw_upcall *);
319 static int add_mfc(struct mfcctl2 *);
320 static int add_vif(struct vifctl *);
321 static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *);
322 static void bw_meter_process(void);
323 static void bw_meter_receive_packet(struct bw_meter *, int,
324 struct timeval *);
325 static void bw_upcalls_send(void);
326 static int del_bw_upcall(struct bw_upcall *);
327 static int del_mfc(struct mfcctl2 *);
328 static int del_vif(vifi_t);
329 static int del_vif_locked(vifi_t);
330 static void expire_bw_meter_process(void *);
331 static void expire_bw_upcalls_send(void *);
332 static void expire_mfc(struct mfc *);
333 static void expire_upcalls(void *);
334 static void free_bw_list(struct bw_meter *);
335 static int get_sg_cnt(struct sioc_sg_req *);
336 static int get_vif_cnt(struct sioc_vif_req *);
337 static void if_detached_event(void *, struct ifnet *);
338 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t);
339 static int ip_mrouter_init(struct socket *, int);
340 static __inline struct mfc *
341 mfc_find(struct in_addr *, struct in_addr *);
342 static void phyint_send(struct ip *, struct vif *, struct mbuf *);
343 static struct mbuf *
344 pim_register_prepare(struct ip *, struct mbuf *);
345 static int pim_register_send(struct ip *, struct vif *,
346 struct mbuf *, struct mfc *);
347 static int pim_register_send_rp(struct ip *, struct vif *,
348 struct mbuf *, struct mfc *);
349 static int pim_register_send_upcall(struct ip *, struct vif *,
350 struct mbuf *, struct mfc *);
351 static void schedule_bw_meter(struct bw_meter *, struct timeval *);
352 static void send_packet(struct vif *, struct mbuf *);
353 static int set_api_config(uint32_t *);
354 static int set_assert(int);
355 static int socket_send(struct socket *, struct mbuf *,
356 struct sockaddr_in *);
357 static void unschedule_bw_meter(struct bw_meter *);
358
359 /*
360 * Kernel multicast forwarding API capabilities and setup.
361 * If more API capabilities are added to the kernel, they should be
362 * recorded in `mrt_api_support'.
363 */
364 #define MRT_API_VERSION 0x0305
365
366 static const int mrt_api_version = MRT_API_VERSION;
367 static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF |
368 MRT_MFC_FLAGS_BORDER_VIF |
369 MRT_MFC_RP |
370 MRT_MFC_BW_UPCALL);
371 VNET_DEFINE_STATIC(uint32_t, mrt_api_config);
372 #define V_mrt_api_config VNET(mrt_api_config)
373 VNET_DEFINE_STATIC(int, pim_assert_enabled);
374 #define V_pim_assert_enabled VNET(pim_assert_enabled)
375 static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */
376
377 /*
378 * Find a route for a given origin IP address and multicast group address.
379 * Statistics must be updated by the caller.
380 */
381 static __inline struct mfc *
mfc_find(struct in_addr * o,struct in_addr * g)382 mfc_find(struct in_addr *o, struct in_addr *g)
383 {
384 struct mfc *rt;
385
386 MFC_LOCK_ASSERT();
387
388 LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) {
389 if (in_hosteq(rt->mfc_origin, *o) &&
390 in_hosteq(rt->mfc_mcastgrp, *g) &&
391 TAILQ_EMPTY(&rt->mfc_stall))
392 break;
393 }
394
395 return (rt);
396 }
397
398 /*
399 * Handle MRT setsockopt commands to modify the multicast forwarding tables.
400 */
401 static int
X_ip_mrouter_set(struct socket * so,struct sockopt * sopt)402 X_ip_mrouter_set(struct socket *so, struct sockopt *sopt)
403 {
404 int error, optval;
405 vifi_t vifi;
406 struct vifctl vifc;
407 struct mfcctl2 mfc;
408 struct bw_upcall bw_upcall;
409 uint32_t i;
410
411 if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT)
412 return EPERM;
413
414 error = 0;
415 switch (sopt->sopt_name) {
416 case MRT_INIT:
417 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
418 if (error)
419 break;
420 error = ip_mrouter_init(so, optval);
421 break;
422
423 case MRT_DONE:
424 error = ip_mrouter_done();
425 break;
426
427 case MRT_ADD_VIF:
428 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
429 if (error)
430 break;
431 error = add_vif(&vifc);
432 break;
433
434 case MRT_DEL_VIF:
435 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
436 if (error)
437 break;
438 error = del_vif(vifi);
439 break;
440
441 case MRT_ADD_MFC:
442 case MRT_DEL_MFC:
443 /*
444 * select data size depending on API version.
445 */
446 if (sopt->sopt_name == MRT_ADD_MFC &&
447 V_mrt_api_config & MRT_API_FLAGS_ALL) {
448 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2),
449 sizeof(struct mfcctl2));
450 } else {
451 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl),
452 sizeof(struct mfcctl));
453 bzero((caddr_t)&mfc + sizeof(struct mfcctl),
454 sizeof(mfc) - sizeof(struct mfcctl));
455 }
456 if (error)
457 break;
458 if (sopt->sopt_name == MRT_ADD_MFC)
459 error = add_mfc(&mfc);
460 else
461 error = del_mfc(&mfc);
462 break;
463
464 case MRT_ASSERT:
465 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
466 if (error)
467 break;
468 set_assert(optval);
469 break;
470
471 case MRT_API_CONFIG:
472 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
473 if (!error)
474 error = set_api_config(&i);
475 if (!error)
476 error = sooptcopyout(sopt, &i, sizeof i);
477 break;
478
479 case MRT_ADD_BW_UPCALL:
480 case MRT_DEL_BW_UPCALL:
481 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall,
482 sizeof bw_upcall);
483 if (error)
484 break;
485 if (sopt->sopt_name == MRT_ADD_BW_UPCALL)
486 error = add_bw_upcall(&bw_upcall);
487 else
488 error = del_bw_upcall(&bw_upcall);
489 break;
490
491 default:
492 error = EOPNOTSUPP;
493 break;
494 }
495 return error;
496 }
497
498 /*
499 * Handle MRT getsockopt commands
500 */
501 static int
X_ip_mrouter_get(struct socket * so,struct sockopt * sopt)502 X_ip_mrouter_get(struct socket *so, struct sockopt *sopt)
503 {
504 int error;
505
506 switch (sopt->sopt_name) {
507 case MRT_VERSION:
508 error = sooptcopyout(sopt, &mrt_api_version, sizeof mrt_api_version);
509 break;
510
511 case MRT_ASSERT:
512 error = sooptcopyout(sopt, &V_pim_assert_enabled,
513 sizeof V_pim_assert_enabled);
514 break;
515
516 case MRT_API_SUPPORT:
517 error = sooptcopyout(sopt, &mrt_api_support, sizeof mrt_api_support);
518 break;
519
520 case MRT_API_CONFIG:
521 error = sooptcopyout(sopt, &V_mrt_api_config, sizeof V_mrt_api_config);
522 break;
523
524 default:
525 error = EOPNOTSUPP;
526 break;
527 }
528 return error;
529 }
530
531 /*
532 * Handle ioctl commands to obtain information from the cache
533 */
534 static int
X_mrt_ioctl(u_long cmd,caddr_t data,int fibnum __unused)535 X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused)
536 {
537 int error = 0;
538
539 /*
540 * Currently the only function calling this ioctl routine is rtioctl_fib().
541 * Typically, only root can create the raw socket in order to execute
542 * this ioctl method, however the request might be coming from a prison
543 */
544 error = priv_check(curthread, PRIV_NETINET_MROUTE);
545 if (error)
546 return (error);
547 switch (cmd) {
548 case (SIOCGETVIFCNT):
549 error = get_vif_cnt((struct sioc_vif_req *)data);
550 break;
551
552 case (SIOCGETSGCNT):
553 error = get_sg_cnt((struct sioc_sg_req *)data);
554 break;
555
556 default:
557 error = EINVAL;
558 break;
559 }
560 return error;
561 }
562
563 /*
564 * returns the packet, byte, rpf-failure count for the source group provided
565 */
566 static int
get_sg_cnt(struct sioc_sg_req * req)567 get_sg_cnt(struct sioc_sg_req *req)
568 {
569 struct mfc *rt;
570
571 MFC_LOCK();
572 rt = mfc_find(&req->src, &req->grp);
573 if (rt == NULL) {
574 MFC_UNLOCK();
575 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
576 return EADDRNOTAVAIL;
577 }
578 req->pktcnt = rt->mfc_pkt_cnt;
579 req->bytecnt = rt->mfc_byte_cnt;
580 req->wrong_if = rt->mfc_wrong_if;
581 MFC_UNLOCK();
582 return 0;
583 }
584
585 /*
586 * returns the input and output packet and byte counts on the vif provided
587 */
588 static int
get_vif_cnt(struct sioc_vif_req * req)589 get_vif_cnt(struct sioc_vif_req *req)
590 {
591 vifi_t vifi = req->vifi;
592
593 VIF_LOCK();
594 if (vifi >= V_numvifs) {
595 VIF_UNLOCK();
596 return EINVAL;
597 }
598
599 req->icount = V_viftable[vifi].v_pkt_in;
600 req->ocount = V_viftable[vifi].v_pkt_out;
601 req->ibytes = V_viftable[vifi].v_bytes_in;
602 req->obytes = V_viftable[vifi].v_bytes_out;
603 VIF_UNLOCK();
604
605 return 0;
606 }
607
608 static void
if_detached_event(void * arg __unused,struct ifnet * ifp)609 if_detached_event(void *arg __unused, struct ifnet *ifp)
610 {
611 vifi_t vifi;
612 u_long i;
613
614 MROUTER_LOCK();
615
616 if (V_ip_mrouter == NULL) {
617 MROUTER_UNLOCK();
618 return;
619 }
620
621 VIF_LOCK();
622 MFC_LOCK();
623
624 /*
625 * Tear down multicast forwarder state associated with this ifnet.
626 * 1. Walk the vif list, matching vifs against this ifnet.
627 * 2. Walk the multicast forwarding cache (mfc) looking for
628 * inner matches with this vif's index.
629 * 3. Expire any matching multicast forwarding cache entries.
630 * 4. Free vif state. This should disable ALLMULTI on the interface.
631 */
632 for (vifi = 0; vifi < V_numvifs; vifi++) {
633 if (V_viftable[vifi].v_ifp != ifp)
634 continue;
635 for (i = 0; i < mfchashsize; i++) {
636 struct mfc *rt, *nrt;
637
638 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
639 if (rt->mfc_parent == vifi) {
640 expire_mfc(rt);
641 }
642 }
643 }
644 del_vif_locked(vifi);
645 }
646
647 MFC_UNLOCK();
648 VIF_UNLOCK();
649
650 MROUTER_UNLOCK();
651 }
652
653 /*
654 * Enable multicast forwarding.
655 */
656 static int
ip_mrouter_init(struct socket * so,int version)657 ip_mrouter_init(struct socket *so, int version)
658 {
659
660 CTR3(KTR_IPMF, "%s: so_type %d, pr_protocol %d", __func__,
661 so->so_type, so->so_proto->pr_protocol);
662
663 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP)
664 return EOPNOTSUPP;
665
666 if (version != 1)
667 return ENOPROTOOPT;
668
669 MROUTER_LOCK();
670
671 if (ip_mrouter_unloading) {
672 MROUTER_UNLOCK();
673 return ENOPROTOOPT;
674 }
675
676 if (V_ip_mrouter != NULL) {
677 MROUTER_UNLOCK();
678 return EADDRINUSE;
679 }
680
681 V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash,
682 HASH_NOWAIT);
683
684 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
685 curvnet);
686 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
687 curvnet);
688 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process,
689 curvnet);
690
691 V_ip_mrouter = so;
692 ip_mrouter_cnt++;
693
694 MROUTER_UNLOCK();
695
696 CTR1(KTR_IPMF, "%s: done", __func__);
697
698 return 0;
699 }
700
701 /*
702 * Disable multicast forwarding.
703 */
704 static int
X_ip_mrouter_done(void)705 X_ip_mrouter_done(void)
706 {
707 struct ifnet *ifp;
708 u_long i;
709 vifi_t vifi;
710
711 MROUTER_LOCK();
712
713 if (V_ip_mrouter == NULL) {
714 MROUTER_UNLOCK();
715 return EINVAL;
716 }
717
718 /*
719 * Detach/disable hooks to the reset of the system.
720 */
721 V_ip_mrouter = NULL;
722 ip_mrouter_cnt--;
723 V_mrt_api_config = 0;
724
725 VIF_LOCK();
726
727 /*
728 * For each phyint in use, disable promiscuous reception of all IP
729 * multicasts.
730 */
731 for (vifi = 0; vifi < V_numvifs; vifi++) {
732 if (!in_nullhost(V_viftable[vifi].v_lcl_addr) &&
733 !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) {
734 ifp = V_viftable[vifi].v_ifp;
735 if_allmulti(ifp, 0);
736 }
737 }
738 bzero((caddr_t)V_viftable, sizeof(V_viftable));
739 V_numvifs = 0;
740 V_pim_assert_enabled = 0;
741
742 VIF_UNLOCK();
743
744 callout_stop(&V_expire_upcalls_ch);
745 callout_stop(&V_bw_upcalls_ch);
746 callout_stop(&V_bw_meter_ch);
747
748 MFC_LOCK();
749
750 /*
751 * Free all multicast forwarding cache entries.
752 * Do not use hashdestroy(), as we must perform other cleanup.
753 */
754 for (i = 0; i < mfchashsize; i++) {
755 struct mfc *rt, *nrt;
756
757 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
758 expire_mfc(rt);
759 }
760 }
761 free(V_mfchashtbl, M_MRTABLE);
762 V_mfchashtbl = NULL;
763
764 bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize);
765
766 V_bw_upcalls_n = 0;
767 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers));
768
769 MFC_UNLOCK();
770
771 V_reg_vif_num = VIFI_INVALID;
772
773 MROUTER_UNLOCK();
774
775 CTR1(KTR_IPMF, "%s: done", __func__);
776
777 return 0;
778 }
779
780 /*
781 * Set PIM assert processing global
782 */
783 static int
set_assert(int i)784 set_assert(int i)
785 {
786 if ((i != 1) && (i != 0))
787 return EINVAL;
788
789 V_pim_assert_enabled = i;
790
791 return 0;
792 }
793
794 /*
795 * Configure API capabilities
796 */
797 int
set_api_config(uint32_t * apival)798 set_api_config(uint32_t *apival)
799 {
800 u_long i;
801
802 /*
803 * We can set the API capabilities only if it is the first operation
804 * after MRT_INIT. I.e.:
805 * - there are no vifs installed
806 * - pim_assert is not enabled
807 * - the MFC table is empty
808 */
809 if (V_numvifs > 0) {
810 *apival = 0;
811 return EPERM;
812 }
813 if (V_pim_assert_enabled) {
814 *apival = 0;
815 return EPERM;
816 }
817
818 MFC_LOCK();
819
820 for (i = 0; i < mfchashsize; i++) {
821 if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) {
822 MFC_UNLOCK();
823 *apival = 0;
824 return EPERM;
825 }
826 }
827
828 MFC_UNLOCK();
829
830 V_mrt_api_config = *apival & mrt_api_support;
831 *apival = V_mrt_api_config;
832
833 return 0;
834 }
835
836 /*
837 * Add a vif to the vif table
838 */
839 static int
add_vif(struct vifctl * vifcp)840 add_vif(struct vifctl *vifcp)
841 {
842 struct vif *vifp = V_viftable + vifcp->vifc_vifi;
843 struct sockaddr_in sin = {sizeof sin, AF_INET};
844 struct ifaddr *ifa;
845 struct ifnet *ifp;
846 int error;
847
848 VIF_LOCK();
849 if (vifcp->vifc_vifi >= MAXVIFS) {
850 VIF_UNLOCK();
851 return EINVAL;
852 }
853 /* rate limiting is no longer supported by this code */
854 if (vifcp->vifc_rate_limit != 0) {
855 log(LOG_ERR, "rate limiting is no longer supported\n");
856 VIF_UNLOCK();
857 return EINVAL;
858 }
859 if (!in_nullhost(vifp->v_lcl_addr)) {
860 VIF_UNLOCK();
861 return EADDRINUSE;
862 }
863 if (in_nullhost(vifcp->vifc_lcl_addr)) {
864 VIF_UNLOCK();
865 return EADDRNOTAVAIL;
866 }
867
868 /* Find the interface with an address in AF_INET family */
869 if (vifcp->vifc_flags & VIFF_REGISTER) {
870 /*
871 * XXX: Because VIFF_REGISTER does not really need a valid
872 * local interface (e.g. it could be 127.0.0.2), we don't
873 * check its address.
874 */
875 ifp = NULL;
876 } else {
877 sin.sin_addr = vifcp->vifc_lcl_addr;
878 NET_EPOCH_ENTER();
879 ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
880 if (ifa == NULL) {
881 NET_EPOCH_EXIT();
882 VIF_UNLOCK();
883 return EADDRNOTAVAIL;
884 }
885 ifp = ifa->ifa_ifp;
886 NET_EPOCH_EXIT();
887 }
888
889 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {
890 CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__);
891 VIF_UNLOCK();
892 return EOPNOTSUPP;
893 } else if (vifcp->vifc_flags & VIFF_REGISTER) {
894 ifp = &V_multicast_register_if;
895 CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp);
896 if (V_reg_vif_num == VIFI_INVALID) {
897 if_initname(&V_multicast_register_if, "register_vif", 0);
898 V_multicast_register_if.if_flags = IFF_LOOPBACK;
899 V_reg_vif_num = vifcp->vifc_vifi;
900 }
901 } else { /* Make sure the interface supports multicast */
902 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
903 VIF_UNLOCK();
904 return EOPNOTSUPP;
905 }
906
907 /* Enable promiscuous reception of all IP multicasts from the if */
908 error = if_allmulti(ifp, 1);
909 if (error) {
910 VIF_UNLOCK();
911 return error;
912 }
913 }
914
915 vifp->v_flags = vifcp->vifc_flags;
916 vifp->v_threshold = vifcp->vifc_threshold;
917 vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
918 vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
919 vifp->v_ifp = ifp;
920 /* initialize per vif pkt counters */
921 vifp->v_pkt_in = 0;
922 vifp->v_pkt_out = 0;
923 vifp->v_bytes_in = 0;
924 vifp->v_bytes_out = 0;
925
926 /* Adjust numvifs up if the vifi is higher than numvifs */
927 if (V_numvifs <= vifcp->vifc_vifi)
928 V_numvifs = vifcp->vifc_vifi + 1;
929
930 VIF_UNLOCK();
931
932 CTR4(KTR_IPMF, "%s: add vif %d laddr 0x%08x thresh %x", __func__,
933 (int)vifcp->vifc_vifi, ntohl(vifcp->vifc_lcl_addr.s_addr),
934 (int)vifcp->vifc_threshold);
935
936 return 0;
937 }
938
939 /*
940 * Delete a vif from the vif table
941 */
942 static int
del_vif_locked(vifi_t vifi)943 del_vif_locked(vifi_t vifi)
944 {
945 struct vif *vifp;
946
947 VIF_LOCK_ASSERT();
948
949 if (vifi >= V_numvifs) {
950 return EINVAL;
951 }
952 vifp = &V_viftable[vifi];
953 if (in_nullhost(vifp->v_lcl_addr)) {
954 return EADDRNOTAVAIL;
955 }
956
957 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER)))
958 if_allmulti(vifp->v_ifp, 0);
959
960 if (vifp->v_flags & VIFF_REGISTER)
961 V_reg_vif_num = VIFI_INVALID;
962
963 bzero((caddr_t)vifp, sizeof (*vifp));
964
965 CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi);
966
967 /* Adjust numvifs down */
968 for (vifi = V_numvifs; vifi > 0; vifi--)
969 if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr))
970 break;
971 V_numvifs = vifi;
972
973 return 0;
974 }
975
976 static int
del_vif(vifi_t vifi)977 del_vif(vifi_t vifi)
978 {
979 int cc;
980
981 VIF_LOCK();
982 cc = del_vif_locked(vifi);
983 VIF_UNLOCK();
984
985 return cc;
986 }
987
988 /*
989 * update an mfc entry without resetting counters and S,G addresses.
990 */
991 static void
update_mfc_params(struct mfc * rt,struct mfcctl2 * mfccp)992 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
993 {
994 int i;
995
996 rt->mfc_parent = mfccp->mfcc_parent;
997 for (i = 0; i < V_numvifs; i++) {
998 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
999 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config &
1000 MRT_MFC_FLAGS_ALL;
1001 }
1002 /* set the RP address */
1003 if (V_mrt_api_config & MRT_MFC_RP)
1004 rt->mfc_rp = mfccp->mfcc_rp;
1005 else
1006 rt->mfc_rp.s_addr = INADDR_ANY;
1007 }
1008
1009 /*
1010 * fully initialize an mfc entry from the parameter.
1011 */
1012 static void
init_mfc_params(struct mfc * rt,struct mfcctl2 * mfccp)1013 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
1014 {
1015 rt->mfc_origin = mfccp->mfcc_origin;
1016 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
1017
1018 update_mfc_params(rt, mfccp);
1019
1020 /* initialize pkt counters per src-grp */
1021 rt->mfc_pkt_cnt = 0;
1022 rt->mfc_byte_cnt = 0;
1023 rt->mfc_wrong_if = 0;
1024 timevalclear(&rt->mfc_last_assert);
1025 }
1026
1027 static void
expire_mfc(struct mfc * rt)1028 expire_mfc(struct mfc *rt)
1029 {
1030 struct rtdetq *rte, *nrte;
1031
1032 MFC_LOCK_ASSERT();
1033
1034 free_bw_list(rt->mfc_bw_meter);
1035
1036 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) {
1037 m_freem(rte->m);
1038 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link);
1039 free(rte, M_MRTABLE);
1040 }
1041
1042 LIST_REMOVE(rt, mfc_hash);
1043 free(rt, M_MRTABLE);
1044 }
1045
1046 /*
1047 * Add an mfc entry
1048 */
1049 static int
add_mfc(struct mfcctl2 * mfccp)1050 add_mfc(struct mfcctl2 *mfccp)
1051 {
1052 struct mfc *rt;
1053 struct rtdetq *rte, *nrte;
1054 u_long hash = 0;
1055 u_short nstl;
1056
1057 VIF_LOCK();
1058 MFC_LOCK();
1059
1060 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp);
1061
1062 /* If an entry already exists, just update the fields */
1063 if (rt) {
1064 CTR4(KTR_IPMF, "%s: update mfc orig 0x%08x group %lx parent %x",
1065 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1066 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1067 mfccp->mfcc_parent);
1068 update_mfc_params(rt, mfccp);
1069 MFC_UNLOCK();
1070 VIF_UNLOCK();
1071 return (0);
1072 }
1073
1074 /*
1075 * Find the entry for which the upcall was made and update
1076 */
1077 nstl = 0;
1078 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp);
1079 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1080 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1081 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) &&
1082 !TAILQ_EMPTY(&rt->mfc_stall)) {
1083 CTR5(KTR_IPMF,
1084 "%s: add mfc orig 0x%08x group %lx parent %x qh %p",
1085 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1086 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1087 mfccp->mfcc_parent,
1088 TAILQ_FIRST(&rt->mfc_stall));
1089 if (nstl++)
1090 CTR1(KTR_IPMF, "%s: multiple matches", __func__);
1091
1092 init_mfc_params(rt, mfccp);
1093 rt->mfc_expire = 0; /* Don't clean this guy up */
1094 V_nexpire[hash]--;
1095
1096 /* Free queued packets, but attempt to forward them first. */
1097 TAILQ_FOREACH_SAFE(rte, &rt->mfc_stall, rte_link, nrte) {
1098 if (rte->ifp != NULL)
1099 ip_mdq(rte->m, rte->ifp, rt, -1);
1100 m_freem(rte->m);
1101 TAILQ_REMOVE(&rt->mfc_stall, rte, rte_link);
1102 rt->mfc_nstall--;
1103 free(rte, M_MRTABLE);
1104 }
1105 }
1106 }
1107
1108 /*
1109 * It is possible that an entry is being inserted without an upcall
1110 */
1111 if (nstl == 0) {
1112 CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__);
1113 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1114 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1115 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) {
1116 init_mfc_params(rt, mfccp);
1117 if (rt->mfc_expire)
1118 V_nexpire[hash]--;
1119 rt->mfc_expire = 0;
1120 break; /* XXX */
1121 }
1122 }
1123
1124 if (rt == NULL) { /* no upcall, so make a new entry */
1125 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
1126 if (rt == NULL) {
1127 MFC_UNLOCK();
1128 VIF_UNLOCK();
1129 return (ENOBUFS);
1130 }
1131
1132 init_mfc_params(rt, mfccp);
1133 TAILQ_INIT(&rt->mfc_stall);
1134 rt->mfc_nstall = 0;
1135
1136 rt->mfc_expire = 0;
1137 rt->mfc_bw_meter = NULL;
1138
1139 /* insert new entry at head of hash chain */
1140 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1141 }
1142 }
1143
1144 MFC_UNLOCK();
1145 VIF_UNLOCK();
1146
1147 return (0);
1148 }
1149
1150 /*
1151 * Delete an mfc entry
1152 */
1153 static int
del_mfc(struct mfcctl2 * mfccp)1154 del_mfc(struct mfcctl2 *mfccp)
1155 {
1156 struct in_addr origin;
1157 struct in_addr mcastgrp;
1158 struct mfc *rt;
1159
1160 origin = mfccp->mfcc_origin;
1161 mcastgrp = mfccp->mfcc_mcastgrp;
1162
1163 CTR3(KTR_IPMF, "%s: delete mfc orig 0x%08x group %lx", __func__,
1164 ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
1165
1166 MFC_LOCK();
1167
1168 rt = mfc_find(&origin, &mcastgrp);
1169 if (rt == NULL) {
1170 MFC_UNLOCK();
1171 return EADDRNOTAVAIL;
1172 }
1173
1174 /*
1175 * free the bw_meter entries
1176 */
1177 free_bw_list(rt->mfc_bw_meter);
1178 rt->mfc_bw_meter = NULL;
1179
1180 LIST_REMOVE(rt, mfc_hash);
1181 free(rt, M_MRTABLE);
1182
1183 MFC_UNLOCK();
1184
1185 return (0);
1186 }
1187
1188 /*
1189 * Send a message to the routing daemon on the multicast routing socket.
1190 */
1191 static int
socket_send(struct socket * s,struct mbuf * mm,struct sockaddr_in * src)1192 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src)
1193 {
1194 if (s) {
1195 SOCKBUF_LOCK(&s->so_rcv);
1196 if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm,
1197 NULL) != 0) {
1198 sorwakeup_locked(s);
1199 return 0;
1200 }
1201 SOCKBUF_UNLOCK(&s->so_rcv);
1202 }
1203 m_freem(mm);
1204 return -1;
1205 }
1206
1207 /*
1208 * IP multicast forwarding function. This function assumes that the packet
1209 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
1210 * pointed to by "ifp", and the packet is to be relayed to other networks
1211 * that have members of the packet's destination IP multicast group.
1212 *
1213 * The packet is returned unscathed to the caller, unless it is
1214 * erroneous, in which case a non-zero return value tells the caller to
1215 * discard it.
1216 */
1217
1218 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
1219
1220 static int
X_ip_mforward(struct ip * ip,struct ifnet * ifp,struct mbuf * m,struct ip_moptions * imo)1221 X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m,
1222 struct ip_moptions *imo)
1223 {
1224 struct mfc *rt;
1225 int error;
1226 vifi_t vifi;
1227
1228 CTR3(KTR_IPMF, "ip_mforward: delete mfc orig 0x%08x group %lx ifp %p",
1229 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), ifp);
1230
1231 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 ||
1232 ((u_char *)(ip + 1))[1] != IPOPT_LSRR ) {
1233 /*
1234 * Packet arrived via a physical interface or
1235 * an encapsulated tunnel or a register_vif.
1236 */
1237 } else {
1238 /*
1239 * Packet arrived through a source-route tunnel.
1240 * Source-route tunnels are no longer supported.
1241 */
1242 return (1);
1243 }
1244
1245 VIF_LOCK();
1246 MFC_LOCK();
1247 if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) {
1248 if (ip->ip_ttl < MAXTTL)
1249 ip->ip_ttl++; /* compensate for -1 in *_send routines */
1250 error = ip_mdq(m, ifp, NULL, vifi);
1251 MFC_UNLOCK();
1252 VIF_UNLOCK();
1253 return error;
1254 }
1255
1256 /*
1257 * Don't forward a packet with time-to-live of zero or one,
1258 * or a packet destined to a local-only group.
1259 */
1260 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) {
1261 MFC_UNLOCK();
1262 VIF_UNLOCK();
1263 return 0;
1264 }
1265
1266 /*
1267 * Determine forwarding vifs from the forwarding cache table
1268 */
1269 MRTSTAT_INC(mrts_mfc_lookups);
1270 rt = mfc_find(&ip->ip_src, &ip->ip_dst);
1271
1272 /* Entry exists, so forward if necessary */
1273 if (rt != NULL) {
1274 error = ip_mdq(m, ifp, rt, -1);
1275 MFC_UNLOCK();
1276 VIF_UNLOCK();
1277 return error;
1278 } else {
1279 /*
1280 * If we don't have a route for packet's origin,
1281 * Make a copy of the packet & send message to routing daemon
1282 */
1283
1284 struct mbuf *mb0;
1285 struct rtdetq *rte;
1286 u_long hash;
1287 int hlen = ip->ip_hl << 2;
1288
1289 MRTSTAT_INC(mrts_mfc_misses);
1290 MRTSTAT_INC(mrts_no_route);
1291 CTR2(KTR_IPMF, "ip_mforward: no mfc for (0x%08x,%lx)",
1292 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr));
1293
1294 /*
1295 * Allocate mbufs early so that we don't do extra work if we are
1296 * just going to fail anyway. Make sure to pullup the header so
1297 * that other people can't step on it.
1298 */
1299 rte = (struct rtdetq *)malloc((sizeof *rte), M_MRTABLE,
1300 M_NOWAIT|M_ZERO);
1301 if (rte == NULL) {
1302 MFC_UNLOCK();
1303 VIF_UNLOCK();
1304 return ENOBUFS;
1305 }
1306
1307 mb0 = m_copypacket(m, M_NOWAIT);
1308 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < hlen))
1309 mb0 = m_pullup(mb0, hlen);
1310 if (mb0 == NULL) {
1311 free(rte, M_MRTABLE);
1312 MFC_UNLOCK();
1313 VIF_UNLOCK();
1314 return ENOBUFS;
1315 }
1316
1317 /* is there an upcall waiting for this flow ? */
1318 hash = MFCHASH(ip->ip_src, ip->ip_dst);
1319 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1320 if (in_hosteq(ip->ip_src, rt->mfc_origin) &&
1321 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) &&
1322 !TAILQ_EMPTY(&rt->mfc_stall))
1323 break;
1324 }
1325
1326 if (rt == NULL) {
1327 int i;
1328 struct igmpmsg *im;
1329 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1330 struct mbuf *mm;
1331
1332 /*
1333 * Locate the vifi for the incoming interface for this packet.
1334 * If none found, drop packet.
1335 */
1336 for (vifi = 0; vifi < V_numvifs &&
1337 V_viftable[vifi].v_ifp != ifp; vifi++)
1338 ;
1339 if (vifi >= V_numvifs) /* vif not found, drop packet */
1340 goto non_fatal;
1341
1342 /* no upcall, so make a new entry */
1343 rt = (struct mfc *)malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT);
1344 if (rt == NULL)
1345 goto fail;
1346
1347 /* Make a copy of the header to send to the user level process */
1348 mm = m_copym(mb0, 0, hlen, M_NOWAIT);
1349 if (mm == NULL)
1350 goto fail1;
1351
1352 /*
1353 * Send message to routing daemon to install
1354 * a route into the kernel table
1355 */
1356
1357 im = mtod(mm, struct igmpmsg *);
1358 im->im_msgtype = IGMPMSG_NOCACHE;
1359 im->im_mbz = 0;
1360 im->im_vif = vifi;
1361
1362 MRTSTAT_INC(mrts_upcalls);
1363
1364 k_igmpsrc.sin_addr = ip->ip_src;
1365 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1366 CTR0(KTR_IPMF, "ip_mforward: socket queue full");
1367 MRTSTAT_INC(mrts_upq_sockfull);
1368 fail1:
1369 free(rt, M_MRTABLE);
1370 fail:
1371 free(rte, M_MRTABLE);
1372 m_freem(mb0);
1373 MFC_UNLOCK();
1374 VIF_UNLOCK();
1375 return ENOBUFS;
1376 }
1377
1378 /* insert new entry at head of hash chain */
1379 rt->mfc_origin.s_addr = ip->ip_src.s_addr;
1380 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
1381 rt->mfc_expire = UPCALL_EXPIRE;
1382 V_nexpire[hash]++;
1383 for (i = 0; i < V_numvifs; i++) {
1384 rt->mfc_ttls[i] = 0;
1385 rt->mfc_flags[i] = 0;
1386 }
1387 rt->mfc_parent = -1;
1388
1389 /* clear the RP address */
1390 rt->mfc_rp.s_addr = INADDR_ANY;
1391 rt->mfc_bw_meter = NULL;
1392
1393 /* initialize pkt counters per src-grp */
1394 rt->mfc_pkt_cnt = 0;
1395 rt->mfc_byte_cnt = 0;
1396 rt->mfc_wrong_if = 0;
1397 timevalclear(&rt->mfc_last_assert);
1398
1399 TAILQ_INIT(&rt->mfc_stall);
1400 rt->mfc_nstall = 0;
1401
1402 /* link into table */
1403 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1404 TAILQ_INSERT_HEAD(&rt->mfc_stall, rte, rte_link);
1405 rt->mfc_nstall++;
1406
1407 } else {
1408 /* determine if queue has overflowed */
1409 if (rt->mfc_nstall > MAX_UPQ) {
1410 MRTSTAT_INC(mrts_upq_ovflw);
1411 non_fatal:
1412 free(rte, M_MRTABLE);
1413 m_freem(mb0);
1414 MFC_UNLOCK();
1415 VIF_UNLOCK();
1416 return (0);
1417 }
1418 TAILQ_INSERT_TAIL(&rt->mfc_stall, rte, rte_link);
1419 rt->mfc_nstall++;
1420 }
1421
1422 rte->m = mb0;
1423 rte->ifp = ifp;
1424
1425 MFC_UNLOCK();
1426 VIF_UNLOCK();
1427
1428 return 0;
1429 }
1430 }
1431
1432 /*
1433 * Clean up the cache entry if upcall is not serviced
1434 */
1435 static void
expire_upcalls(void * arg)1436 expire_upcalls(void *arg)
1437 {
1438 u_long i;
1439
1440 CURVNET_SET((struct vnet *) arg);
1441
1442 MFC_LOCK();
1443
1444 for (i = 0; i < mfchashsize; i++) {
1445 struct mfc *rt, *nrt;
1446
1447 if (V_nexpire[i] == 0)
1448 continue;
1449
1450 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
1451 if (TAILQ_EMPTY(&rt->mfc_stall))
1452 continue;
1453
1454 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0)
1455 continue;
1456
1457 /*
1458 * free the bw_meter entries
1459 */
1460 while (rt->mfc_bw_meter != NULL) {
1461 struct bw_meter *x = rt->mfc_bw_meter;
1462
1463 rt->mfc_bw_meter = x->bm_mfc_next;
1464 free(x, M_BWMETER);
1465 }
1466
1467 MRTSTAT_INC(mrts_cache_cleanups);
1468 CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__,
1469 (u_long)ntohl(rt->mfc_origin.s_addr),
1470 (u_long)ntohl(rt->mfc_mcastgrp.s_addr));
1471
1472 expire_mfc(rt);
1473 }
1474 }
1475
1476 MFC_UNLOCK();
1477
1478 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
1479 curvnet);
1480
1481 CURVNET_RESTORE();
1482 }
1483
1484 /*
1485 * Packet forwarding routine once entry in the cache is made
1486 */
1487 static int
ip_mdq(struct mbuf * m,struct ifnet * ifp,struct mfc * rt,vifi_t xmt_vif)1488 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif)
1489 {
1490 struct ip *ip = mtod(m, struct ip *);
1491 vifi_t vifi;
1492 int plen = ntohs(ip->ip_len);
1493
1494 VIF_LOCK_ASSERT();
1495
1496 /*
1497 * If xmt_vif is not -1, send on only the requested vif.
1498 *
1499 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
1500 */
1501 if (xmt_vif < V_numvifs) {
1502 if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER)
1503 pim_register_send(ip, V_viftable + xmt_vif, m, rt);
1504 else
1505 phyint_send(ip, V_viftable + xmt_vif, m);
1506 return 1;
1507 }
1508
1509 /*
1510 * Don't forward if it didn't arrive from the parent vif for its origin.
1511 */
1512 vifi = rt->mfc_parent;
1513 if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) {
1514 CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)",
1515 __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp);
1516 MRTSTAT_INC(mrts_wrong_if);
1517 ++rt->mfc_wrong_if;
1518 /*
1519 * If we are doing PIM assert processing, send a message
1520 * to the routing daemon.
1521 *
1522 * XXX: A PIM-SM router needs the WRONGVIF detection so it
1523 * can complete the SPT switch, regardless of the type
1524 * of the iif (broadcast media, GRE tunnel, etc).
1525 */
1526 if (V_pim_assert_enabled && (vifi < V_numvifs) &&
1527 V_viftable[vifi].v_ifp) {
1528
1529 if (ifp == &V_multicast_register_if)
1530 PIMSTAT_INC(pims_rcv_registers_wrongiif);
1531
1532 /* Get vifi for the incoming packet */
1533 for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp;
1534 vifi++)
1535 ;
1536 if (vifi >= V_numvifs)
1537 return 0; /* The iif is not found: ignore the packet. */
1538
1539 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF)
1540 return 0; /* WRONGVIF disabled: ignore the packet */
1541
1542 if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) {
1543 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1544 struct igmpmsg *im;
1545 int hlen = ip->ip_hl << 2;
1546 struct mbuf *mm = m_copym(m, 0, hlen, M_NOWAIT);
1547
1548 if (mm && (!M_WRITABLE(mm) || mm->m_len < hlen))
1549 mm = m_pullup(mm, hlen);
1550 if (mm == NULL)
1551 return ENOBUFS;
1552
1553 im = mtod(mm, struct igmpmsg *);
1554 im->im_msgtype = IGMPMSG_WRONGVIF;
1555 im->im_mbz = 0;
1556 im->im_vif = vifi;
1557
1558 MRTSTAT_INC(mrts_upcalls);
1559
1560 k_igmpsrc.sin_addr = im->im_src;
1561 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1562 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
1563 MRTSTAT_INC(mrts_upq_sockfull);
1564 return ENOBUFS;
1565 }
1566 }
1567 }
1568 return 0;
1569 }
1570
1571
1572 /* If I sourced this packet, it counts as output, else it was input. */
1573 if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) {
1574 V_viftable[vifi].v_pkt_out++;
1575 V_viftable[vifi].v_bytes_out += plen;
1576 } else {
1577 V_viftable[vifi].v_pkt_in++;
1578 V_viftable[vifi].v_bytes_in += plen;
1579 }
1580 rt->mfc_pkt_cnt++;
1581 rt->mfc_byte_cnt += plen;
1582
1583 /*
1584 * For each vif, decide if a copy of the packet should be forwarded.
1585 * Forward if:
1586 * - the ttl exceeds the vif's threshold
1587 * - there are group members downstream on interface
1588 */
1589 for (vifi = 0; vifi < V_numvifs; vifi++)
1590 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) {
1591 V_viftable[vifi].v_pkt_out++;
1592 V_viftable[vifi].v_bytes_out += plen;
1593 if (V_viftable[vifi].v_flags & VIFF_REGISTER)
1594 pim_register_send(ip, V_viftable + vifi, m, rt);
1595 else
1596 phyint_send(ip, V_viftable + vifi, m);
1597 }
1598
1599 /*
1600 * Perform upcall-related bw measuring.
1601 */
1602 if (rt->mfc_bw_meter != NULL) {
1603 struct bw_meter *x;
1604 struct timeval now;
1605
1606 microtime(&now);
1607 MFC_LOCK_ASSERT();
1608 for (x = rt->mfc_bw_meter; x != NULL; x = x->bm_mfc_next)
1609 bw_meter_receive_packet(x, plen, &now);
1610 }
1611
1612 return 0;
1613 }
1614
1615 /*
1616 * Check if a vif number is legal/ok. This is used by in_mcast.c.
1617 */
1618 static int
X_legal_vif_num(int vif)1619 X_legal_vif_num(int vif)
1620 {
1621 int ret;
1622
1623 ret = 0;
1624 if (vif < 0)
1625 return (ret);
1626
1627 VIF_LOCK();
1628 if (vif < V_numvifs)
1629 ret = 1;
1630 VIF_UNLOCK();
1631
1632 return (ret);
1633 }
1634
1635 /*
1636 * Return the local address used by this vif
1637 */
1638 static u_long
X_ip_mcast_src(int vifi)1639 X_ip_mcast_src(int vifi)
1640 {
1641 in_addr_t addr;
1642
1643 addr = INADDR_ANY;
1644 if (vifi < 0)
1645 return (addr);
1646
1647 VIF_LOCK();
1648 if (vifi < V_numvifs)
1649 addr = V_viftable[vifi].v_lcl_addr.s_addr;
1650 VIF_UNLOCK();
1651
1652 return (addr);
1653 }
1654
1655 static void
phyint_send(struct ip * ip,struct vif * vifp,struct mbuf * m)1656 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
1657 {
1658 struct mbuf *mb_copy;
1659 int hlen = ip->ip_hl << 2;
1660
1661 VIF_LOCK_ASSERT();
1662
1663 /*
1664 * Make a new reference to the packet; make sure that
1665 * the IP header is actually copied, not just referenced,
1666 * so that ip_output() only scribbles on the copy.
1667 */
1668 mb_copy = m_copypacket(m, M_NOWAIT);
1669 if (mb_copy && (!M_WRITABLE(mb_copy) || mb_copy->m_len < hlen))
1670 mb_copy = m_pullup(mb_copy, hlen);
1671 if (mb_copy == NULL)
1672 return;
1673
1674 send_packet(vifp, mb_copy);
1675 }
1676
1677 static void
send_packet(struct vif * vifp,struct mbuf * m)1678 send_packet(struct vif *vifp, struct mbuf *m)
1679 {
1680 struct ip_moptions imo;
1681 int error __unused;
1682
1683 VIF_LOCK_ASSERT();
1684
1685 imo.imo_multicast_ifp = vifp->v_ifp;
1686 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
1687 imo.imo_multicast_loop = 1;
1688 imo.imo_multicast_vif = -1;
1689 STAILQ_INIT(&imo.imo_head);
1690
1691 /*
1692 * Re-entrancy should not be a problem here, because
1693 * the packets that we send out and are looped back at us
1694 * should get rejected because they appear to come from
1695 * the loopback interface, thus preventing looping.
1696 */
1697 error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL);
1698 CTR3(KTR_IPMF, "%s: vif %td err %d", __func__,
1699 (ptrdiff_t)(vifp - V_viftable), error);
1700 }
1701
1702 /*
1703 * Stubs for old RSVP socket shim implementation.
1704 */
1705
1706 static int
X_ip_rsvp_vif(struct socket * so __unused,struct sockopt * sopt __unused)1707 X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused)
1708 {
1709
1710 return (EOPNOTSUPP);
1711 }
1712
1713 static void
X_ip_rsvp_force_done(struct socket * so __unused)1714 X_ip_rsvp_force_done(struct socket *so __unused)
1715 {
1716
1717 }
1718
1719 static int
X_rsvp_input(struct mbuf ** mp,int * offp,int proto)1720 X_rsvp_input(struct mbuf **mp, int *offp, int proto)
1721 {
1722 struct mbuf *m;
1723
1724 m = *mp;
1725 *mp = NULL;
1726 if (!V_rsvp_on)
1727 m_freem(m);
1728 return (IPPROTO_DONE);
1729 }
1730
1731 /*
1732 * Code for bandwidth monitors
1733 */
1734
1735 /*
1736 * Define common interface for timeval-related methods
1737 */
1738 #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp)
1739 #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp))
1740 #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp))
1741
1742 static uint32_t
compute_bw_meter_flags(struct bw_upcall * req)1743 compute_bw_meter_flags(struct bw_upcall *req)
1744 {
1745 uint32_t flags = 0;
1746
1747 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS)
1748 flags |= BW_METER_UNIT_PACKETS;
1749 if (req->bu_flags & BW_UPCALL_UNIT_BYTES)
1750 flags |= BW_METER_UNIT_BYTES;
1751 if (req->bu_flags & BW_UPCALL_GEQ)
1752 flags |= BW_METER_GEQ;
1753 if (req->bu_flags & BW_UPCALL_LEQ)
1754 flags |= BW_METER_LEQ;
1755
1756 return flags;
1757 }
1758
1759 /*
1760 * Add a bw_meter entry
1761 */
1762 static int
add_bw_upcall(struct bw_upcall * req)1763 add_bw_upcall(struct bw_upcall *req)
1764 {
1765 struct mfc *mfc;
1766 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC,
1767 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC };
1768 struct timeval now;
1769 struct bw_meter *x;
1770 uint32_t flags;
1771
1772 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
1773 return EOPNOTSUPP;
1774
1775 /* Test if the flags are valid */
1776 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES)))
1777 return EINVAL;
1778 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)))
1779 return EINVAL;
1780 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
1781 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
1782 return EINVAL;
1783
1784 /* Test if the threshold time interval is valid */
1785 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <))
1786 return EINVAL;
1787
1788 flags = compute_bw_meter_flags(req);
1789
1790 /*
1791 * Find if we have already same bw_meter entry
1792 */
1793 MFC_LOCK();
1794 mfc = mfc_find(&req->bu_src, &req->bu_dst);
1795 if (mfc == NULL) {
1796 MFC_UNLOCK();
1797 return EADDRNOTAVAIL;
1798 }
1799 for (x = mfc->mfc_bw_meter; x != NULL; x = x->bm_mfc_next) {
1800 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
1801 &req->bu_threshold.b_time, ==)) &&
1802 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) &&
1803 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) &&
1804 (x->bm_flags & BW_METER_USER_FLAGS) == flags) {
1805 MFC_UNLOCK();
1806 return 0; /* XXX Already installed */
1807 }
1808 }
1809
1810 /* Allocate the new bw_meter entry */
1811 x = (struct bw_meter *)malloc(sizeof(*x), M_BWMETER, M_NOWAIT);
1812 if (x == NULL) {
1813 MFC_UNLOCK();
1814 return ENOBUFS;
1815 }
1816
1817 /* Set the new bw_meter entry */
1818 x->bm_threshold.b_time = req->bu_threshold.b_time;
1819 microtime(&now);
1820 x->bm_start_time = now;
1821 x->bm_threshold.b_packets = req->bu_threshold.b_packets;
1822 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes;
1823 x->bm_measured.b_packets = 0;
1824 x->bm_measured.b_bytes = 0;
1825 x->bm_flags = flags;
1826 x->bm_time_next = NULL;
1827 x->bm_time_hash = BW_METER_BUCKETS;
1828
1829 /* Add the new bw_meter entry to the front of entries for this MFC */
1830 x->bm_mfc = mfc;
1831 x->bm_mfc_next = mfc->mfc_bw_meter;
1832 mfc->mfc_bw_meter = x;
1833 schedule_bw_meter(x, &now);
1834 MFC_UNLOCK();
1835
1836 return 0;
1837 }
1838
1839 static void
free_bw_list(struct bw_meter * list)1840 free_bw_list(struct bw_meter *list)
1841 {
1842 while (list != NULL) {
1843 struct bw_meter *x = list;
1844
1845 list = list->bm_mfc_next;
1846 unschedule_bw_meter(x);
1847 free(x, M_BWMETER);
1848 }
1849 }
1850
1851 /*
1852 * Delete one or multiple bw_meter entries
1853 */
1854 static int
del_bw_upcall(struct bw_upcall * req)1855 del_bw_upcall(struct bw_upcall *req)
1856 {
1857 struct mfc *mfc;
1858 struct bw_meter *x;
1859
1860 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
1861 return EOPNOTSUPP;
1862
1863 MFC_LOCK();
1864
1865 /* Find the corresponding MFC entry */
1866 mfc = mfc_find(&req->bu_src, &req->bu_dst);
1867 if (mfc == NULL) {
1868 MFC_UNLOCK();
1869 return EADDRNOTAVAIL;
1870 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) {
1871 /*
1872 * Delete all bw_meter entries for this mfc
1873 */
1874 struct bw_meter *list;
1875
1876 list = mfc->mfc_bw_meter;
1877 mfc->mfc_bw_meter = NULL;
1878 free_bw_list(list);
1879 MFC_UNLOCK();
1880 return 0;
1881 } else { /* Delete a single bw_meter entry */
1882 struct bw_meter *prev;
1883 uint32_t flags = 0;
1884
1885 flags = compute_bw_meter_flags(req);
1886
1887 /* Find the bw_meter entry to delete */
1888 for (prev = NULL, x = mfc->mfc_bw_meter; x != NULL;
1889 prev = x, x = x->bm_mfc_next) {
1890 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
1891 &req->bu_threshold.b_time, ==)) &&
1892 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) &&
1893 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) &&
1894 (x->bm_flags & BW_METER_USER_FLAGS) == flags)
1895 break;
1896 }
1897 if (x != NULL) { /* Delete entry from the list for this MFC */
1898 if (prev != NULL)
1899 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/
1900 else
1901 x->bm_mfc->mfc_bw_meter = x->bm_mfc_next;/* new head of list */
1902
1903 unschedule_bw_meter(x);
1904 MFC_UNLOCK();
1905 /* Free the bw_meter entry */
1906 free(x, M_BWMETER);
1907 return 0;
1908 } else {
1909 MFC_UNLOCK();
1910 return EINVAL;
1911 }
1912 }
1913 /* NOTREACHED */
1914 }
1915
1916 /*
1917 * Perform bandwidth measurement processing that may result in an upcall
1918 */
1919 static void
bw_meter_receive_packet(struct bw_meter * x,int plen,struct timeval * nowp)1920 bw_meter_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp)
1921 {
1922 struct timeval delta;
1923
1924 MFC_LOCK_ASSERT();
1925
1926 delta = *nowp;
1927 BW_TIMEVALDECR(&delta, &x->bm_start_time);
1928
1929 if (x->bm_flags & BW_METER_GEQ) {
1930 /*
1931 * Processing for ">=" type of bw_meter entry
1932 */
1933 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) {
1934 /* Reset the bw_meter entry */
1935 x->bm_start_time = *nowp;
1936 x->bm_measured.b_packets = 0;
1937 x->bm_measured.b_bytes = 0;
1938 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
1939 }
1940
1941 /* Record that a packet is received */
1942 x->bm_measured.b_packets++;
1943 x->bm_measured.b_bytes += plen;
1944
1945 /*
1946 * Test if we should deliver an upcall
1947 */
1948 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) {
1949 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
1950 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) ||
1951 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
1952 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) {
1953 /* Prepare an upcall for delivery */
1954 bw_meter_prepare_upcall(x, nowp);
1955 x->bm_flags |= BW_METER_UPCALL_DELIVERED;
1956 }
1957 }
1958 } else if (x->bm_flags & BW_METER_LEQ) {
1959 /*
1960 * Processing for "<=" type of bw_meter entry
1961 */
1962 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) {
1963 /*
1964 * We are behind time with the multicast forwarding table
1965 * scanning for "<=" type of bw_meter entries, so test now
1966 * if we should deliver an upcall.
1967 */
1968 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
1969 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) ||
1970 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
1971 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) {
1972 /* Prepare an upcall for delivery */
1973 bw_meter_prepare_upcall(x, nowp);
1974 }
1975 /* Reschedule the bw_meter entry */
1976 unschedule_bw_meter(x);
1977 schedule_bw_meter(x, nowp);
1978 }
1979
1980 /* Record that a packet is received */
1981 x->bm_measured.b_packets++;
1982 x->bm_measured.b_bytes += plen;
1983
1984 /*
1985 * Test if we should restart the measuring interval
1986 */
1987 if ((x->bm_flags & BW_METER_UNIT_PACKETS &&
1988 x->bm_measured.b_packets <= x->bm_threshold.b_packets) ||
1989 (x->bm_flags & BW_METER_UNIT_BYTES &&
1990 x->bm_measured.b_bytes <= x->bm_threshold.b_bytes)) {
1991 /* Don't restart the measuring interval */
1992 } else {
1993 /* Do restart the measuring interval */
1994 /*
1995 * XXX: note that we don't unschedule and schedule, because this
1996 * might be too much overhead per packet. Instead, when we process
1997 * all entries for a given timer hash bin, we check whether it is
1998 * really a timeout. If not, we reschedule at that time.
1999 */
2000 x->bm_start_time = *nowp;
2001 x->bm_measured.b_packets = 0;
2002 x->bm_measured.b_bytes = 0;
2003 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
2004 }
2005 }
2006 }
2007
2008 /*
2009 * Prepare a bandwidth-related upcall
2010 */
2011 static void
bw_meter_prepare_upcall(struct bw_meter * x,struct timeval * nowp)2012 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp)
2013 {
2014 struct timeval delta;
2015 struct bw_upcall *u;
2016
2017 MFC_LOCK_ASSERT();
2018
2019 /*
2020 * Compute the measured time interval
2021 */
2022 delta = *nowp;
2023 BW_TIMEVALDECR(&delta, &x->bm_start_time);
2024
2025 /*
2026 * If there are too many pending upcalls, deliver them now
2027 */
2028 if (V_bw_upcalls_n >= BW_UPCALLS_MAX)
2029 bw_upcalls_send();
2030
2031 /*
2032 * Set the bw_upcall entry
2033 */
2034 u = &V_bw_upcalls[V_bw_upcalls_n++];
2035 u->bu_src = x->bm_mfc->mfc_origin;
2036 u->bu_dst = x->bm_mfc->mfc_mcastgrp;
2037 u->bu_threshold.b_time = x->bm_threshold.b_time;
2038 u->bu_threshold.b_packets = x->bm_threshold.b_packets;
2039 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes;
2040 u->bu_measured.b_time = delta;
2041 u->bu_measured.b_packets = x->bm_measured.b_packets;
2042 u->bu_measured.b_bytes = x->bm_measured.b_bytes;
2043 u->bu_flags = 0;
2044 if (x->bm_flags & BW_METER_UNIT_PACKETS)
2045 u->bu_flags |= BW_UPCALL_UNIT_PACKETS;
2046 if (x->bm_flags & BW_METER_UNIT_BYTES)
2047 u->bu_flags |= BW_UPCALL_UNIT_BYTES;
2048 if (x->bm_flags & BW_METER_GEQ)
2049 u->bu_flags |= BW_UPCALL_GEQ;
2050 if (x->bm_flags & BW_METER_LEQ)
2051 u->bu_flags |= BW_UPCALL_LEQ;
2052 }
2053
2054 /*
2055 * Send the pending bandwidth-related upcalls
2056 */
2057 static void
bw_upcalls_send(void)2058 bw_upcalls_send(void)
2059 {
2060 struct mbuf *m;
2061 int len = V_bw_upcalls_n * sizeof(V_bw_upcalls[0]);
2062 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2063 static struct igmpmsg igmpmsg = { 0, /* unused1 */
2064 0, /* unused2 */
2065 IGMPMSG_BW_UPCALL,/* im_msgtype */
2066 0, /* im_mbz */
2067 0, /* im_vif */
2068 0, /* unused3 */
2069 { 0 }, /* im_src */
2070 { 0 } }; /* im_dst */
2071
2072 MFC_LOCK_ASSERT();
2073
2074 if (V_bw_upcalls_n == 0)
2075 return; /* No pending upcalls */
2076
2077 V_bw_upcalls_n = 0;
2078
2079 /*
2080 * Allocate a new mbuf, initialize it with the header and
2081 * the payload for the pending calls.
2082 */
2083 m = m_gethdr(M_NOWAIT, MT_DATA);
2084 if (m == NULL) {
2085 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n");
2086 return;
2087 }
2088
2089 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg);
2090 m_copyback(m, sizeof(struct igmpmsg), len, (caddr_t)&V_bw_upcalls[0]);
2091
2092 /*
2093 * Send the upcalls
2094 * XXX do we need to set the address in k_igmpsrc ?
2095 */
2096 MRTSTAT_INC(mrts_upcalls);
2097 if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) {
2098 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n");
2099 MRTSTAT_INC(mrts_upq_sockfull);
2100 }
2101 }
2102
2103 /*
2104 * Compute the timeout hash value for the bw_meter entries
2105 */
2106 #define BW_METER_TIMEHASH(bw_meter, hash) \
2107 do { \
2108 struct timeval next_timeval = (bw_meter)->bm_start_time; \
2109 \
2110 BW_TIMEVALADD(&next_timeval, &(bw_meter)->bm_threshold.b_time); \
2111 (hash) = next_timeval.tv_sec; \
2112 if (next_timeval.tv_usec) \
2113 (hash)++; /* XXX: make sure we don't timeout early */ \
2114 (hash) %= BW_METER_BUCKETS; \
2115 } while (0)
2116
2117 /*
2118 * Schedule a timer to process periodically bw_meter entry of type "<="
2119 * by linking the entry in the proper hash bucket.
2120 */
2121 static void
schedule_bw_meter(struct bw_meter * x,struct timeval * nowp)2122 schedule_bw_meter(struct bw_meter *x, struct timeval *nowp)
2123 {
2124 int time_hash;
2125
2126 MFC_LOCK_ASSERT();
2127
2128 if (!(x->bm_flags & BW_METER_LEQ))
2129 return; /* XXX: we schedule timers only for "<=" entries */
2130
2131 /*
2132 * Reset the bw_meter entry
2133 */
2134 x->bm_start_time = *nowp;
2135 x->bm_measured.b_packets = 0;
2136 x->bm_measured.b_bytes = 0;
2137 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
2138
2139 /*
2140 * Compute the timeout hash value and insert the entry
2141 */
2142 BW_METER_TIMEHASH(x, time_hash);
2143 x->bm_time_next = V_bw_meter_timers[time_hash];
2144 V_bw_meter_timers[time_hash] = x;
2145 x->bm_time_hash = time_hash;
2146 }
2147
2148 /*
2149 * Unschedule the periodic timer that processes bw_meter entry of type "<="
2150 * by removing the entry from the proper hash bucket.
2151 */
2152 static void
unschedule_bw_meter(struct bw_meter * x)2153 unschedule_bw_meter(struct bw_meter *x)
2154 {
2155 int time_hash;
2156 struct bw_meter *prev, *tmp;
2157
2158 MFC_LOCK_ASSERT();
2159
2160 if (!(x->bm_flags & BW_METER_LEQ))
2161 return; /* XXX: we schedule timers only for "<=" entries */
2162
2163 /*
2164 * Compute the timeout hash value and delete the entry
2165 */
2166 time_hash = x->bm_time_hash;
2167 if (time_hash >= BW_METER_BUCKETS)
2168 return; /* Entry was not scheduled */
2169
2170 for (prev = NULL, tmp = V_bw_meter_timers[time_hash];
2171 tmp != NULL; prev = tmp, tmp = tmp->bm_time_next)
2172 if (tmp == x)
2173 break;
2174
2175 if (tmp == NULL)
2176 panic("unschedule_bw_meter: bw_meter entry not found");
2177
2178 if (prev != NULL)
2179 prev->bm_time_next = x->bm_time_next;
2180 else
2181 V_bw_meter_timers[time_hash] = x->bm_time_next;
2182
2183 x->bm_time_next = NULL;
2184 x->bm_time_hash = BW_METER_BUCKETS;
2185 }
2186
2187
2188 /*
2189 * Process all "<=" type of bw_meter that should be processed now,
2190 * and for each entry prepare an upcall if necessary. Each processed
2191 * entry is rescheduled again for the (periodic) processing.
2192 *
2193 * This is run periodically (once per second normally). On each round,
2194 * all the potentially matching entries are in the hash slot that we are
2195 * looking at.
2196 */
2197 static void
bw_meter_process()2198 bw_meter_process()
2199 {
2200 uint32_t loops;
2201 int i;
2202 struct timeval now, process_endtime;
2203
2204 microtime(&now);
2205 if (V_last_tv_sec == now.tv_sec)
2206 return; /* nothing to do */
2207
2208 loops = now.tv_sec - V_last_tv_sec;
2209 V_last_tv_sec = now.tv_sec;
2210 if (loops > BW_METER_BUCKETS)
2211 loops = BW_METER_BUCKETS;
2212
2213 MFC_LOCK();
2214 /*
2215 * Process all bins of bw_meter entries from the one after the last
2216 * processed to the current one. On entry, i points to the last bucket
2217 * visited, so we need to increment i at the beginning of the loop.
2218 */
2219 for (i = (now.tv_sec - loops) % BW_METER_BUCKETS; loops > 0; loops--) {
2220 struct bw_meter *x, *tmp_list;
2221
2222 if (++i >= BW_METER_BUCKETS)
2223 i = 0;
2224
2225 /* Disconnect the list of bw_meter entries from the bin */
2226 tmp_list = V_bw_meter_timers[i];
2227 V_bw_meter_timers[i] = NULL;
2228
2229 /* Process the list of bw_meter entries */
2230 while (tmp_list != NULL) {
2231 x = tmp_list;
2232 tmp_list = tmp_list->bm_time_next;
2233
2234 /* Test if the time interval is over */
2235 process_endtime = x->bm_start_time;
2236 BW_TIMEVALADD(&process_endtime, &x->bm_threshold.b_time);
2237 if (BW_TIMEVALCMP(&process_endtime, &now, >)) {
2238 /* Not yet: reschedule, but don't reset */
2239 int time_hash;
2240
2241 BW_METER_TIMEHASH(x, time_hash);
2242 if (time_hash == i && process_endtime.tv_sec == now.tv_sec) {
2243 /*
2244 * XXX: somehow the bin processing is a bit ahead of time.
2245 * Put the entry in the next bin.
2246 */
2247 if (++time_hash >= BW_METER_BUCKETS)
2248 time_hash = 0;
2249 }
2250 x->bm_time_next = V_bw_meter_timers[time_hash];
2251 V_bw_meter_timers[time_hash] = x;
2252 x->bm_time_hash = time_hash;
2253
2254 continue;
2255 }
2256
2257 /*
2258 * Test if we should deliver an upcall
2259 */
2260 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
2261 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) ||
2262 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
2263 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) {
2264 /* Prepare an upcall for delivery */
2265 bw_meter_prepare_upcall(x, &now);
2266 }
2267
2268 /*
2269 * Reschedule for next processing
2270 */
2271 schedule_bw_meter(x, &now);
2272 }
2273 }
2274
2275 /* Send all upcalls that are pending delivery */
2276 bw_upcalls_send();
2277
2278 MFC_UNLOCK();
2279 }
2280
2281 /*
2282 * A periodic function for sending all upcalls that are pending delivery
2283 */
2284 static void
expire_bw_upcalls_send(void * arg)2285 expire_bw_upcalls_send(void *arg)
2286 {
2287 CURVNET_SET((struct vnet *) arg);
2288
2289 MFC_LOCK();
2290 bw_upcalls_send();
2291 MFC_UNLOCK();
2292
2293 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
2294 curvnet);
2295 CURVNET_RESTORE();
2296 }
2297
2298 /*
2299 * A periodic function for periodic scanning of the multicast forwarding
2300 * table for processing all "<=" bw_meter entries.
2301 */
2302 static void
expire_bw_meter_process(void * arg)2303 expire_bw_meter_process(void *arg)
2304 {
2305 CURVNET_SET((struct vnet *) arg);
2306
2307 if (V_mrt_api_config & MRT_MFC_BW_UPCALL)
2308 bw_meter_process();
2309
2310 callout_reset(&V_bw_meter_ch, BW_METER_PERIOD, expire_bw_meter_process,
2311 curvnet);
2312 CURVNET_RESTORE();
2313 }
2314
2315 /*
2316 * End of bandwidth monitoring code
2317 */
2318
2319 /*
2320 * Send the packet up to the user daemon, or eventually do kernel encapsulation
2321 *
2322 */
2323 static int
pim_register_send(struct ip * ip,struct vif * vifp,struct mbuf * m,struct mfc * rt)2324 pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m,
2325 struct mfc *rt)
2326 {
2327 struct mbuf *mb_copy, *mm;
2328
2329 /*
2330 * Do not send IGMP_WHOLEPKT notifications to userland, if the
2331 * rendezvous point was unspecified, and we were told not to.
2332 */
2333 if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) &&
2334 in_nullhost(rt->mfc_rp))
2335 return 0;
2336
2337 mb_copy = pim_register_prepare(ip, m);
2338 if (mb_copy == NULL)
2339 return ENOBUFS;
2340
2341 /*
2342 * Send all the fragments. Note that the mbuf for each fragment
2343 * is freed by the sending machinery.
2344 */
2345 for (mm = mb_copy; mm; mm = mb_copy) {
2346 mb_copy = mm->m_nextpkt;
2347 mm->m_nextpkt = 0;
2348 mm = m_pullup(mm, sizeof(struct ip));
2349 if (mm != NULL) {
2350 ip = mtod(mm, struct ip *);
2351 if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) {
2352 pim_register_send_rp(ip, vifp, mm, rt);
2353 } else {
2354 pim_register_send_upcall(ip, vifp, mm, rt);
2355 }
2356 }
2357 }
2358
2359 return 0;
2360 }
2361
2362 /*
2363 * Return a copy of the data packet that is ready for PIM Register
2364 * encapsulation.
2365 * XXX: Note that in the returned copy the IP header is a valid one.
2366 */
2367 static struct mbuf *
pim_register_prepare(struct ip * ip,struct mbuf * m)2368 pim_register_prepare(struct ip *ip, struct mbuf *m)
2369 {
2370 struct mbuf *mb_copy = NULL;
2371 int mtu;
2372
2373 /* Take care of delayed checksums */
2374 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2375 in_delayed_cksum(m);
2376 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2377 }
2378
2379 /*
2380 * Copy the old packet & pullup its IP header into the
2381 * new mbuf so we can modify it.
2382 */
2383 mb_copy = m_copypacket(m, M_NOWAIT);
2384 if (mb_copy == NULL)
2385 return NULL;
2386 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2);
2387 if (mb_copy == NULL)
2388 return NULL;
2389
2390 /* take care of the TTL */
2391 ip = mtod(mb_copy, struct ip *);
2392 --ip->ip_ttl;
2393
2394 /* Compute the MTU after the PIM Register encapsulation */
2395 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr);
2396
2397 if (ntohs(ip->ip_len) <= mtu) {
2398 /* Turn the IP header into a valid one */
2399 ip->ip_sum = 0;
2400 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
2401 } else {
2402 /* Fragment the packet */
2403 mb_copy->m_pkthdr.csum_flags |= CSUM_IP;
2404 if (ip_fragment(ip, &mb_copy, mtu, 0) != 0) {
2405 m_freem(mb_copy);
2406 return NULL;
2407 }
2408 }
2409 return mb_copy;
2410 }
2411
2412 /*
2413 * Send an upcall with the data packet to the user-level process.
2414 */
2415 static int
pim_register_send_upcall(struct ip * ip,struct vif * vifp,struct mbuf * mb_copy,struct mfc * rt)2416 pim_register_send_upcall(struct ip *ip, struct vif *vifp,
2417 struct mbuf *mb_copy, struct mfc *rt)
2418 {
2419 struct mbuf *mb_first;
2420 int len = ntohs(ip->ip_len);
2421 struct igmpmsg *im;
2422 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2423
2424 VIF_LOCK_ASSERT();
2425
2426 /*
2427 * Add a new mbuf with an upcall header
2428 */
2429 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2430 if (mb_first == NULL) {
2431 m_freem(mb_copy);
2432 return ENOBUFS;
2433 }
2434 mb_first->m_data += max_linkhdr;
2435 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg);
2436 mb_first->m_len = sizeof(struct igmpmsg);
2437 mb_first->m_next = mb_copy;
2438
2439 /* Send message to routing daemon */
2440 im = mtod(mb_first, struct igmpmsg *);
2441 im->im_msgtype = IGMPMSG_WHOLEPKT;
2442 im->im_mbz = 0;
2443 im->im_vif = vifp - V_viftable;
2444 im->im_src = ip->ip_src;
2445 im->im_dst = ip->ip_dst;
2446
2447 k_igmpsrc.sin_addr = ip->ip_src;
2448
2449 MRTSTAT_INC(mrts_upcalls);
2450
2451 if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) {
2452 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
2453 MRTSTAT_INC(mrts_upq_sockfull);
2454 return ENOBUFS;
2455 }
2456
2457 /* Keep statistics */
2458 PIMSTAT_INC(pims_snd_registers_msgs);
2459 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2460
2461 return 0;
2462 }
2463
2464 /*
2465 * Encapsulate the data packet in PIM Register message and send it to the RP.
2466 */
2467 static int
pim_register_send_rp(struct ip * ip,struct vif * vifp,struct mbuf * mb_copy,struct mfc * rt)2468 pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy,
2469 struct mfc *rt)
2470 {
2471 struct mbuf *mb_first;
2472 struct ip *ip_outer;
2473 struct pim_encap_pimhdr *pimhdr;
2474 int len = ntohs(ip->ip_len);
2475 vifi_t vifi = rt->mfc_parent;
2476
2477 VIF_LOCK_ASSERT();
2478
2479 if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) {
2480 m_freem(mb_copy);
2481 return EADDRNOTAVAIL; /* The iif vif is invalid */
2482 }
2483
2484 /*
2485 * Add a new mbuf with the encapsulating header
2486 */
2487 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2488 if (mb_first == NULL) {
2489 m_freem(mb_copy);
2490 return ENOBUFS;
2491 }
2492 mb_first->m_data += max_linkhdr;
2493 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr);
2494 mb_first->m_next = mb_copy;
2495
2496 mb_first->m_pkthdr.len = len + mb_first->m_len;
2497
2498 /*
2499 * Fill in the encapsulating IP and PIM header
2500 */
2501 ip_outer = mtod(mb_first, struct ip *);
2502 *ip_outer = pim_encap_iphdr;
2503 ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) +
2504 sizeof(pim_encap_pimhdr));
2505 ip_outer->ip_src = V_viftable[vifi].v_lcl_addr;
2506 ip_outer->ip_dst = rt->mfc_rp;
2507 /*
2508 * Copy the inner header TOS to the outer header, and take care of the
2509 * IP_DF bit.
2510 */
2511 ip_outer->ip_tos = ip->ip_tos;
2512 if (ip->ip_off & htons(IP_DF))
2513 ip_outer->ip_off |= htons(IP_DF);
2514 ip_fillid(ip_outer);
2515 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer
2516 + sizeof(pim_encap_iphdr));
2517 *pimhdr = pim_encap_pimhdr;
2518 /* If the iif crosses a border, set the Border-bit */
2519 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config)
2520 pimhdr->flags |= htonl(PIM_BORDER_REGISTER);
2521
2522 mb_first->m_data += sizeof(pim_encap_iphdr);
2523 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr));
2524 mb_first->m_data -= sizeof(pim_encap_iphdr);
2525
2526 send_packet(vifp, mb_first);
2527
2528 /* Keep statistics */
2529 PIMSTAT_INC(pims_snd_registers_msgs);
2530 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2531
2532 return 0;
2533 }
2534
2535 /*
2536 * pim_encapcheck() is called by the encap4_input() path at runtime to
2537 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
2538 * into the kernel.
2539 */
2540 static int
pim_encapcheck(const struct mbuf * m __unused,int off __unused,int proto __unused,void * arg __unused)2541 pim_encapcheck(const struct mbuf *m __unused, int off __unused,
2542 int proto __unused, void *arg __unused)
2543 {
2544
2545 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
2546 return (8); /* claim the datagram. */
2547 }
2548
2549 /*
2550 * PIM-SMv2 and PIM-DM messages processing.
2551 * Receives and verifies the PIM control messages, and passes them
2552 * up to the listening socket, using rip_input().
2553 * The only message with special processing is the PIM_REGISTER message
2554 * (used by PIM-SM): the PIM header is stripped off, and the inner packet
2555 * is passed to if_simloop().
2556 */
2557 static int
pim_input(struct mbuf * m,int off,int proto,void * arg __unused)2558 pim_input(struct mbuf *m, int off, int proto, void *arg __unused)
2559 {
2560 struct ip *ip = mtod(m, struct ip *);
2561 struct pim *pim;
2562 int iphlen = off;
2563 int minlen;
2564 int datalen = ntohs(ip->ip_len) - iphlen;
2565 int ip_tos;
2566
2567 /* Keep statistics */
2568 PIMSTAT_INC(pims_rcv_total_msgs);
2569 PIMSTAT_ADD(pims_rcv_total_bytes, datalen);
2570
2571 /*
2572 * Validate lengths
2573 */
2574 if (datalen < PIM_MINLEN) {
2575 PIMSTAT_INC(pims_rcv_tooshort);
2576 CTR3(KTR_IPMF, "%s: short packet (%d) from 0x%08x",
2577 __func__, datalen, ntohl(ip->ip_src.s_addr));
2578 m_freem(m);
2579 return (IPPROTO_DONE);
2580 }
2581
2582 /*
2583 * If the packet is at least as big as a REGISTER, go agead
2584 * and grab the PIM REGISTER header size, to avoid another
2585 * possible m_pullup() later.
2586 *
2587 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8
2588 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28
2589 */
2590 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN);
2591 /*
2592 * Get the IP and PIM headers in contiguous memory, and
2593 * possibly the PIM REGISTER header.
2594 */
2595 if (m->m_len < minlen && (m = m_pullup(m, minlen)) == NULL) {
2596 CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__);
2597 return (IPPROTO_DONE);
2598 }
2599
2600 /* m_pullup() may have given us a new mbuf so reset ip. */
2601 ip = mtod(m, struct ip *);
2602 ip_tos = ip->ip_tos;
2603
2604 /* adjust mbuf to point to the PIM header */
2605 m->m_data += iphlen;
2606 m->m_len -= iphlen;
2607 pim = mtod(m, struct pim *);
2608
2609 /*
2610 * Validate checksum. If PIM REGISTER, exclude the data packet.
2611 *
2612 * XXX: some older PIMv2 implementations don't make this distinction,
2613 * so for compatibility reason perform the checksum over part of the
2614 * message, and if error, then over the whole message.
2615 */
2616 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) {
2617 /* do nothing, checksum okay */
2618 } else if (in_cksum(m, datalen)) {
2619 PIMSTAT_INC(pims_rcv_badsum);
2620 CTR1(KTR_IPMF, "%s: invalid checksum", __func__);
2621 m_freem(m);
2622 return (IPPROTO_DONE);
2623 }
2624
2625 /* PIM version check */
2626 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) {
2627 PIMSTAT_INC(pims_rcv_badversion);
2628 CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__,
2629 (int)PIM_VT_V(pim->pim_vt), PIM_VERSION);
2630 m_freem(m);
2631 return (IPPROTO_DONE);
2632 }
2633
2634 /* restore mbuf back to the outer IP */
2635 m->m_data -= iphlen;
2636 m->m_len += iphlen;
2637
2638 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) {
2639 /*
2640 * Since this is a REGISTER, we'll make a copy of the register
2641 * headers ip + pim + u_int32 + encap_ip, to be passed up to the
2642 * routing daemon.
2643 */
2644 struct sockaddr_in dst = { sizeof(dst), AF_INET };
2645 struct mbuf *mcp;
2646 struct ip *encap_ip;
2647 u_int32_t *reghdr;
2648 struct ifnet *vifp;
2649
2650 VIF_LOCK();
2651 if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) {
2652 VIF_UNLOCK();
2653 CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__,
2654 (int)V_reg_vif_num);
2655 m_freem(m);
2656 return (IPPROTO_DONE);
2657 }
2658 /* XXX need refcnt? */
2659 vifp = V_viftable[V_reg_vif_num].v_ifp;
2660 VIF_UNLOCK();
2661
2662 /*
2663 * Validate length
2664 */
2665 if (datalen < PIM_REG_MINLEN) {
2666 PIMSTAT_INC(pims_rcv_tooshort);
2667 PIMSTAT_INC(pims_rcv_badregisters);
2668 CTR1(KTR_IPMF, "%s: register packet size too small", __func__);
2669 m_freem(m);
2670 return (IPPROTO_DONE);
2671 }
2672
2673 reghdr = (u_int32_t *)(pim + 1);
2674 encap_ip = (struct ip *)(reghdr + 1);
2675
2676 CTR3(KTR_IPMF, "%s: register: encap ip src 0x%08x len %d",
2677 __func__, ntohl(encap_ip->ip_src.s_addr),
2678 ntohs(encap_ip->ip_len));
2679
2680 /* verify the version number of the inner packet */
2681 if (encap_ip->ip_v != IPVERSION) {
2682 PIMSTAT_INC(pims_rcv_badregisters);
2683 CTR1(KTR_IPMF, "%s: bad encap ip version", __func__);
2684 m_freem(m);
2685 return (IPPROTO_DONE);
2686 }
2687
2688 /* verify the inner packet is destined to a mcast group */
2689 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) {
2690 PIMSTAT_INC(pims_rcv_badregisters);
2691 CTR2(KTR_IPMF, "%s: bad encap ip dest 0x%08x", __func__,
2692 ntohl(encap_ip->ip_dst.s_addr));
2693 m_freem(m);
2694 return (IPPROTO_DONE);
2695 }
2696
2697 /* If a NULL_REGISTER, pass it to the daemon */
2698 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
2699 goto pim_input_to_daemon;
2700
2701 /*
2702 * Copy the TOS from the outer IP header to the inner IP header.
2703 */
2704 if (encap_ip->ip_tos != ip_tos) {
2705 /* Outer TOS -> inner TOS */
2706 encap_ip->ip_tos = ip_tos;
2707 /* Recompute the inner header checksum. Sigh... */
2708
2709 /* adjust mbuf to point to the inner IP header */
2710 m->m_data += (iphlen + PIM_MINLEN);
2711 m->m_len -= (iphlen + PIM_MINLEN);
2712
2713 encap_ip->ip_sum = 0;
2714 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2);
2715
2716 /* restore mbuf to point back to the outer IP header */
2717 m->m_data -= (iphlen + PIM_MINLEN);
2718 m->m_len += (iphlen + PIM_MINLEN);
2719 }
2720
2721 /*
2722 * Decapsulate the inner IP packet and loopback to forward it
2723 * as a normal multicast packet. Also, make a copy of the
2724 * outer_iphdr + pimhdr + reghdr + encap_iphdr
2725 * to pass to the daemon later, so it can take the appropriate
2726 * actions (e.g., send back PIM_REGISTER_STOP).
2727 * XXX: here m->m_data points to the outer IP header.
2728 */
2729 mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_NOWAIT);
2730 if (mcp == NULL) {
2731 CTR1(KTR_IPMF, "%s: m_copym() failed", __func__);
2732 m_freem(m);
2733 return (IPPROTO_DONE);
2734 }
2735
2736 /* Keep statistics */
2737 /* XXX: registers_bytes include only the encap. mcast pkt */
2738 PIMSTAT_INC(pims_rcv_registers_msgs);
2739 PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len));
2740
2741 /*
2742 * forward the inner ip packet; point m_data at the inner ip.
2743 */
2744 m_adj(m, iphlen + PIM_MINLEN);
2745
2746 CTR4(KTR_IPMF,
2747 "%s: forward decap'd REGISTER: src %lx dst %lx vif %d",
2748 __func__,
2749 (u_long)ntohl(encap_ip->ip_src.s_addr),
2750 (u_long)ntohl(encap_ip->ip_dst.s_addr),
2751 (int)V_reg_vif_num);
2752
2753 /* NB: vifp was collected above; can it change on us? */
2754 if_simloop(vifp, m, dst.sin_family, 0);
2755
2756 /* prepare the register head to send to the mrouting daemon */
2757 m = mcp;
2758 }
2759
2760 pim_input_to_daemon:
2761 /*
2762 * Pass the PIM message up to the daemon; if it is a Register message,
2763 * pass the 'head' only up to the daemon. This includes the
2764 * outer IP header, PIM header, PIM-Register header and the
2765 * inner IP header.
2766 * XXX: the outer IP header pkt size of a Register is not adjust to
2767 * reflect the fact that the inner multicast data is truncated.
2768 */
2769 return (rip_input(&m, &off, proto));
2770 }
2771
2772 static int
sysctl_mfctable(SYSCTL_HANDLER_ARGS)2773 sysctl_mfctable(SYSCTL_HANDLER_ARGS)
2774 {
2775 struct mfc *rt;
2776 int error, i;
2777
2778 if (req->newptr)
2779 return (EPERM);
2780 if (V_mfchashtbl == NULL) /* XXX unlocked */
2781 return (0);
2782 error = sysctl_wire_old_buffer(req, 0);
2783 if (error)
2784 return (error);
2785
2786 MFC_LOCK();
2787 for (i = 0; i < mfchashsize; i++) {
2788 LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) {
2789 error = SYSCTL_OUT(req, rt, sizeof(struct mfc));
2790 if (error)
2791 goto out_locked;
2792 }
2793 }
2794 out_locked:
2795 MFC_UNLOCK();
2796 return (error);
2797 }
2798
2799 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable, CTLFLAG_RD,
2800 sysctl_mfctable, "IPv4 Multicast Forwarding Table "
2801 "(struct *mfc[mfchashsize], netinet/ip_mroute.h)");
2802
2803 static void
vnet_mroute_init(const void * unused __unused)2804 vnet_mroute_init(const void *unused __unused)
2805 {
2806
2807 V_nexpire = malloc(mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO);
2808 bzero(V_bw_meter_timers, sizeof(V_bw_meter_timers));
2809 callout_init(&V_expire_upcalls_ch, 1);
2810 callout_init(&V_bw_upcalls_ch, 1);
2811 callout_init(&V_bw_meter_ch, 1);
2812 }
2813
2814 VNET_SYSINIT(vnet_mroute_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_init,
2815 NULL);
2816
2817 static void
vnet_mroute_uninit(const void * unused __unused)2818 vnet_mroute_uninit(const void *unused __unused)
2819 {
2820
2821 free(V_nexpire, M_MRTABLE);
2822 V_nexpire = NULL;
2823 }
2824
2825 VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE,
2826 vnet_mroute_uninit, NULL);
2827
2828 static int
ip_mroute_modevent(module_t mod,int type,void * unused)2829 ip_mroute_modevent(module_t mod, int type, void *unused)
2830 {
2831
2832 switch (type) {
2833 case MOD_LOAD:
2834 MROUTER_LOCK_INIT();
2835
2836 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2837 if_detached_event, NULL, EVENTHANDLER_PRI_ANY);
2838 if (if_detach_event_tag == NULL) {
2839 printf("ip_mroute: unable to register "
2840 "ifnet_departure_event handler\n");
2841 MROUTER_LOCK_DESTROY();
2842 return (EINVAL);
2843 }
2844
2845 MFC_LOCK_INIT();
2846 VIF_LOCK_INIT();
2847
2848 mfchashsize = MFCHASHSIZE;
2849 if (TUNABLE_ULONG_FETCH("net.inet.ip.mfchashsize", &mfchashsize) &&
2850 !powerof2(mfchashsize)) {
2851 printf("WARNING: %s not a power of 2; using default\n",
2852 "net.inet.ip.mfchashsize");
2853 mfchashsize = MFCHASHSIZE;
2854 }
2855
2856 pim_squelch_wholepkt = 0;
2857 TUNABLE_ULONG_FETCH("net.inet.pim.squelch_wholepkt",
2858 &pim_squelch_wholepkt);
2859
2860 pim_encap_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
2861 if (pim_encap_cookie == NULL) {
2862 printf("ip_mroute: unable to attach pim encap\n");
2863 VIF_LOCK_DESTROY();
2864 MFC_LOCK_DESTROY();
2865 MROUTER_LOCK_DESTROY();
2866 return (EINVAL);
2867 }
2868
2869 ip_mcast_src = X_ip_mcast_src;
2870 ip_mforward = X_ip_mforward;
2871 ip_mrouter_done = X_ip_mrouter_done;
2872 ip_mrouter_get = X_ip_mrouter_get;
2873 ip_mrouter_set = X_ip_mrouter_set;
2874
2875 ip_rsvp_force_done = X_ip_rsvp_force_done;
2876 ip_rsvp_vif = X_ip_rsvp_vif;
2877
2878 legal_vif_num = X_legal_vif_num;
2879 mrt_ioctl = X_mrt_ioctl;
2880 rsvp_input_p = X_rsvp_input;
2881 break;
2882
2883 case MOD_UNLOAD:
2884 /*
2885 * Typically module unload happens after the user-level
2886 * process has shutdown the kernel services (the check
2887 * below insures someone can't just yank the module out
2888 * from under a running process). But if the module is
2889 * just loaded and then unloaded w/o starting up a user
2890 * process we still need to cleanup.
2891 */
2892 MROUTER_LOCK();
2893 if (ip_mrouter_cnt != 0) {
2894 MROUTER_UNLOCK();
2895 return (EINVAL);
2896 }
2897 ip_mrouter_unloading = 1;
2898 MROUTER_UNLOCK();
2899
2900 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2901
2902 if (pim_encap_cookie) {
2903 ip_encap_detach(pim_encap_cookie);
2904 pim_encap_cookie = NULL;
2905 }
2906
2907 ip_mcast_src = NULL;
2908 ip_mforward = NULL;
2909 ip_mrouter_done = NULL;
2910 ip_mrouter_get = NULL;
2911 ip_mrouter_set = NULL;
2912
2913 ip_rsvp_force_done = NULL;
2914 ip_rsvp_vif = NULL;
2915
2916 legal_vif_num = NULL;
2917 mrt_ioctl = NULL;
2918 rsvp_input_p = NULL;
2919
2920 VIF_LOCK_DESTROY();
2921 MFC_LOCK_DESTROY();
2922 MROUTER_LOCK_DESTROY();
2923 break;
2924
2925 default:
2926 return EOPNOTSUPP;
2927 }
2928 return 0;
2929 }
2930
2931 static moduledata_t ip_mroutemod = {
2932 "ip_mroute",
2933 ip_mroute_modevent,
2934 0
2935 };
2936
2937 DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE);
2938