2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989 Stephen Deering
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
9 * Stephen Deering of Stanford University.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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
35 * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
39 * IP multicast forwarding procedures
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 * Modified by Wojciech Macek, Semihalf, May 2021
54 * MROUTING Revision: 3.5
55 * and PIM-SMv2 and PIM-DM support, advanced API support,
56 * bandwidth metering and signaling
60 * TODO: Prefix functions with ipmf_.
61 * TODO: Maintain a refcount on if_allmulti() in ifnet or in the protocol
62 * domain attachment (if_afdata) so we can track consumers of that service.
63 * TODO: Deprecate routing socket path for SIOCGETSGCNT and SIOCGETVIFCNT,
64 * move it to socket options.
65 * TODO: Cleanup LSRR removal further.
66 * TODO: Push RSVP stubs into raw_ip.c.
67 * TODO: Use bitstring.h for vif set.
68 * TODO: Fix mrt6_ioctl dangling ref when dynamically loaded.
69 * TODO: Sync ip6_mroute.c with this file.
72 #include <sys/cdefs.h>
74 #include "opt_mrouting.h"
78 #include <sys/types.h>
79 #include <sys/param.h>
80 #include <sys/kernel.h>
81 #include <sys/stddef.h>
82 #include <sys/condvar.h>
83 #include <sys/eventhandler.h>
85 #include <sys/kthread.h>
87 #include <sys/malloc.h>
89 #include <sys/module.h>
91 #include <sys/protosw.h>
92 #include <sys/signalvar.h>
93 #include <sys/socket.h>
94 #include <sys/socketvar.h>
95 #include <sys/sockio.h>
97 #include <sys/sysctl.h>
98 #include <sys/syslog.h>
99 #include <sys/systm.h>
100 #include <sys/taskqueue.h>
101 #include <sys/time.h>
102 #include <sys/counter.h>
103 #include <machine/atomic.h>
106 #include <net/if_var.h>
107 #include <net/if_private.h>
108 #include <net/if_types.h>
109 #include <net/netisr.h>
110 #include <net/route.h>
111 #include <net/vnet.h>
113 #include <netinet/in.h>
114 #include <netinet/igmp.h>
115 #include <netinet/in_systm.h>
116 #include <netinet/in_var.h>
117 #include <netinet/ip.h>
118 #include <netinet/ip_encap.h>
119 #include <netinet/ip_mroute.h>
120 #include <netinet/ip_var.h>
121 #include <netinet/ip_options.h>
122 #include <netinet/pim.h>
123 #include <netinet/pim_var.h>
124 #include <netinet/udp.h>
126 #include <machine/in_cksum.h>
129 #define KTR_IPMF KTR_INET
132 #define VIFI_INVALID ((vifi_t) -1)
134 static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast forwarding cache");
137 * Locking. We use two locks: one for the virtual interface table and
138 * one for the forwarding table. These locks may be nested in which case
139 * the VIF lock must always be taken first. Note that each lock is used
140 * to cover not only the specific data structure but also related data
144 static struct rwlock mrouter_lock;
145 #define MRW_RLOCK() rw_rlock(&mrouter_lock)
146 #define MRW_WLOCK() rw_wlock(&mrouter_lock)
147 #define MRW_RUNLOCK() rw_runlock(&mrouter_lock)
148 #define MRW_WUNLOCK() rw_wunlock(&mrouter_lock)
149 #define MRW_UNLOCK() rw_unlock(&mrouter_lock)
150 #define MRW_LOCK_ASSERT() rw_assert(&mrouter_lock, RA_LOCKED)
151 #define MRW_WLOCK_ASSERT() rw_assert(&mrouter_lock, RA_WLOCKED)
152 #define MRW_LOCK_TRY_UPGRADE() rw_try_upgrade(&mrouter_lock)
153 #define MRW_WOWNED() rw_wowned(&mrouter_lock)
154 #define MRW_LOCK_INIT() \
155 rw_init(&mrouter_lock, "IPv4 multicast forwarding")
156 #define MRW_LOCK_DESTROY() rw_destroy(&mrouter_lock)
158 static int ip_mrouter_cnt; /* # of vnets with active mrouters */
159 static int ip_mrouter_unloading; /* Allow no more V_ip_mrouter sockets */
161 VNET_PCPUSTAT_DEFINE_STATIC(struct mrtstat, mrtstat);
162 VNET_PCPUSTAT_SYSINIT(mrtstat);
163 VNET_PCPUSTAT_SYSUNINIT(mrtstat);
164 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, OID_AUTO, mrtstat, struct mrtstat,
165 mrtstat, "IPv4 Multicast Forwarding Statistics (struct mrtstat, "
166 "netinet/ip_mroute.h)");
168 VNET_DEFINE_STATIC(u_long, mfchash);
169 #define V_mfchash VNET(mfchash)
170 #define MFCHASH(a, g) \
171 ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \
172 ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & V_mfchash)
173 #define MFCHASHSIZE 256
175 static u_long mfchashsize; /* Hash size */
176 VNET_DEFINE_STATIC(u_char *, nexpire); /* 0..mfchashsize-1 */
177 #define V_nexpire VNET(nexpire)
178 VNET_DEFINE_STATIC(LIST_HEAD(mfchashhdr, mfc)*, mfchashtbl);
179 #define V_mfchashtbl VNET(mfchashtbl)
180 VNET_DEFINE_STATIC(struct taskqueue *, task_queue);
181 #define V_task_queue VNET(task_queue)
182 VNET_DEFINE_STATIC(struct task, task);
183 #define V_task VNET(task)
185 VNET_DEFINE_STATIC(vifi_t, numvifs);
186 #define V_numvifs VNET(numvifs)
187 VNET_DEFINE_STATIC(struct vif *, viftable);
188 #define V_viftable VNET(viftable)
190 static eventhandler_tag if_detach_event_tag = NULL;
192 VNET_DEFINE_STATIC(struct callout, expire_upcalls_ch);
193 #define V_expire_upcalls_ch VNET(expire_upcalls_ch)
195 VNET_DEFINE_STATIC(struct mtx, buf_ring_mtx);
196 #define V_buf_ring_mtx VNET(buf_ring_mtx)
198 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
199 #define UPCALL_EXPIRE 6 /* number of timeouts */
202 * Bandwidth meter variables and constants
204 static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters");
207 * Pending upcalls are stored in a ring which is flushed when
208 * full, or periodically
210 VNET_DEFINE_STATIC(struct callout, bw_upcalls_ch);
211 #define V_bw_upcalls_ch VNET(bw_upcalls_ch)
212 VNET_DEFINE_STATIC(struct buf_ring *, bw_upcalls_ring);
213 #define V_bw_upcalls_ring VNET(bw_upcalls_ring)
214 VNET_DEFINE_STATIC(struct mtx, bw_upcalls_ring_mtx);
215 #define V_bw_upcalls_ring_mtx VNET(bw_upcalls_ring_mtx)
217 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */
219 VNET_PCPUSTAT_DEFINE_STATIC(struct pimstat, pimstat);
220 VNET_PCPUSTAT_SYSINIT(pimstat);
221 VNET_PCPUSTAT_SYSUNINIT(pimstat);
223 SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
225 SYSCTL_VNET_PCPUSTAT(_net_inet_pim, PIMCTL_STATS, stats, struct pimstat,
226 pimstat, "PIM Statistics (struct pimstat, netinet/pim_var.h)");
228 static u_long pim_squelch_wholepkt = 0;
229 SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RW,
230 &pim_squelch_wholepkt, 0,
231 "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified");
233 static const struct encaptab *pim_encap_cookie;
234 static int pim_encapcheck(const struct mbuf *, int, int, void *);
235 static int pim_input(struct mbuf *, int, int, void *);
237 extern int in_mcast_loop;
239 static const struct encap_config ipv4_encap_cfg = {
240 .proto = IPPROTO_PIM,
241 .min_length = sizeof(struct ip) + PIM_MINLEN,
243 .check = pim_encapcheck,
248 * Note: the PIM Register encapsulation adds the following in front of a
251 * struct pim_encap_hdr {
253 * struct pim_encap_pimhdr pim;
258 struct pim_encap_pimhdr {
262 #define PIM_ENCAP_TTL 64
264 static struct ip pim_encap_iphdr = {
265 #if BYTE_ORDER == LITTLE_ENDIAN
266 sizeof(struct ip) >> 2,
270 sizeof(struct ip) >> 2,
273 sizeof(struct ip), /* total length */
281 static struct pim_encap_pimhdr pim_encap_pimhdr = {
283 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */
290 VNET_DEFINE_STATIC(vifi_t, reg_vif_num) = VIFI_INVALID;
291 #define V_reg_vif_num VNET(reg_vif_num)
292 VNET_DEFINE_STATIC(struct ifnet *, multicast_register_if);
293 #define V_multicast_register_if VNET(multicast_register_if)
299 static u_long X_ip_mcast_src(int);
300 static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *,
301 struct ip_moptions *);
302 static int X_ip_mrouter_done(void);
303 static int X_ip_mrouter_get(struct socket *, struct sockopt *);
304 static int X_ip_mrouter_set(struct socket *, struct sockopt *);
305 static int X_legal_vif_num(int);
306 static int X_mrt_ioctl(u_long, caddr_t, int);
308 static int add_bw_upcall(struct bw_upcall *);
309 static int add_mfc(struct mfcctl2 *);
310 static int add_vif(struct vifctl *);
311 static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *);
312 static void bw_meter_geq_receive_packet(struct bw_meter *, int,
314 static void bw_upcalls_send(void);
315 static int del_bw_upcall(struct bw_upcall *);
316 static int del_mfc(struct mfcctl2 *);
317 static int del_vif(vifi_t);
318 static int del_vif_locked(vifi_t, struct ifnet **, struct ifnet **);
319 static void expire_bw_upcalls_send(void *);
320 static void expire_mfc(struct mfc *);
321 static void expire_upcalls(void *);
322 static void free_bw_list(struct bw_meter *);
323 static int get_sg_cnt(struct sioc_sg_req *);
324 static int get_vif_cnt(struct sioc_vif_req *);
325 static void if_detached_event(void *, struct ifnet *);
326 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t);
327 static int ip_mrouter_init(struct socket *, int);
328 static __inline struct mfc *
329 mfc_find(struct in_addr *, struct in_addr *);
330 static void phyint_send(struct ip *, struct vif *, struct mbuf *);
332 pim_register_prepare(struct ip *, struct mbuf *);
333 static int pim_register_send(struct ip *, struct vif *,
334 struct mbuf *, struct mfc *);
335 static int pim_register_send_rp(struct ip *, struct vif *,
336 struct mbuf *, struct mfc *);
337 static int pim_register_send_upcall(struct ip *, struct vif *,
338 struct mbuf *, struct mfc *);
339 static void send_packet(struct vif *, struct mbuf *);
340 static int set_api_config(uint32_t *);
341 static int set_assert(int);
342 static int socket_send(struct socket *, struct mbuf *,
343 struct sockaddr_in *);
346 * Kernel multicast forwarding API capabilities and setup.
347 * If more API capabilities are added to the kernel, they should be
348 * recorded in `mrt_api_support'.
350 #define MRT_API_VERSION 0x0305
352 static const int mrt_api_version = MRT_API_VERSION;
353 static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF |
354 MRT_MFC_FLAGS_BORDER_VIF |
357 VNET_DEFINE_STATIC(uint32_t, mrt_api_config);
358 #define V_mrt_api_config VNET(mrt_api_config)
359 VNET_DEFINE_STATIC(int, pim_assert_enabled);
360 #define V_pim_assert_enabled VNET(pim_assert_enabled)
361 static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */
364 * Find a route for a given origin IP address and multicast group address.
365 * Statistics must be updated by the caller.
367 static __inline struct mfc *
368 mfc_find(struct in_addr *o, struct in_addr *g)
373 * Might be called both RLOCK and WLOCK.
374 * Check if any, it's caller responsibility
375 * to choose correct option.
379 LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) {
380 if (in_hosteq(rt->mfc_origin, *o) &&
381 in_hosteq(rt->mfc_mcastgrp, *g) &&
382 buf_ring_empty(rt->mfc_stall_ring))
389 static __inline struct mfc *
393 rt = malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT | M_ZERO);
397 rt->mfc_stall_ring = buf_ring_alloc(MAX_UPQ, M_MRTABLE,
398 M_NOWAIT, &V_buf_ring_mtx);
399 if (rt->mfc_stall_ring == NULL) {
408 * Handle MRT setsockopt commands to modify the multicast forwarding tables.
411 X_ip_mrouter_set(struct socket *so, struct sockopt *sopt)
417 struct bw_upcall bw_upcall;
420 if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT)
424 switch (sopt->sopt_name) {
426 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
429 error = ip_mrouter_init(so, optval);
432 error = ip_mrouter_done();
435 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
438 error = add_vif(&vifc);
441 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
444 error = del_vif(vifi);
449 * select data size depending on API version.
451 if (sopt->sopt_name == MRT_ADD_MFC &&
452 V_mrt_api_config & MRT_API_FLAGS_ALL) {
453 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2),
454 sizeof(struct mfcctl2));
456 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl),
457 sizeof(struct mfcctl));
458 bzero((caddr_t)&mfc + sizeof(struct mfcctl),
459 sizeof(mfc) - sizeof(struct mfcctl));
463 if (sopt->sopt_name == MRT_ADD_MFC)
464 error = add_mfc(&mfc);
466 error = del_mfc(&mfc);
470 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
477 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
479 error = set_api_config(&i);
481 error = sooptcopyout(sopt, &i, sizeof i);
484 case MRT_ADD_BW_UPCALL:
485 case MRT_DEL_BW_UPCALL:
486 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall,
490 if (sopt->sopt_name == MRT_ADD_BW_UPCALL)
491 error = add_bw_upcall(&bw_upcall);
493 error = del_bw_upcall(&bw_upcall);
504 * Handle MRT getsockopt commands
507 X_ip_mrouter_get(struct socket *so, struct sockopt *sopt)
511 switch (sopt->sopt_name) {
513 error = sooptcopyout(sopt, &mrt_api_version,
514 sizeof mrt_api_version);
517 error = sooptcopyout(sopt, &V_pim_assert_enabled,
518 sizeof V_pim_assert_enabled);
520 case MRT_API_SUPPORT:
521 error = sooptcopyout(sopt, &mrt_api_support,
522 sizeof mrt_api_support);
525 error = sooptcopyout(sopt, &V_mrt_api_config,
526 sizeof V_mrt_api_config);
536 * Handle ioctl commands to obtain information from the cache
539 X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused)
544 * Currently the only function calling this ioctl routine is rtioctl_fib().
545 * Typically, only root can create the raw socket in order to execute
546 * this ioctl method, however the request might be coming from a prison
548 error = priv_check(curthread, PRIV_NETINET_MROUTE);
552 case (SIOCGETVIFCNT):
553 error = get_vif_cnt((struct sioc_vif_req *)data);
557 error = get_sg_cnt((struct sioc_sg_req *)data);
568 * returns the packet, byte, rpf-failure count for the source group provided
571 get_sg_cnt(struct sioc_sg_req *req)
576 rt = mfc_find(&req->src, &req->grp);
579 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
580 return EADDRNOTAVAIL;
582 req->pktcnt = rt->mfc_pkt_cnt;
583 req->bytecnt = rt->mfc_byte_cnt;
584 req->wrong_if = rt->mfc_wrong_if;
590 * returns the input and output packet and byte counts on the vif provided
593 get_vif_cnt(struct sioc_vif_req *req)
595 vifi_t vifi = req->vifi;
598 if (vifi >= V_numvifs) {
603 mtx_lock_spin(&V_viftable[vifi].v_spin);
604 req->icount = V_viftable[vifi].v_pkt_in;
605 req->ocount = V_viftable[vifi].v_pkt_out;
606 req->ibytes = V_viftable[vifi].v_bytes_in;
607 req->obytes = V_viftable[vifi].v_bytes_out;
608 mtx_unlock_spin(&V_viftable[vifi].v_spin);
615 if_detached_event(void *arg __unused, struct ifnet *ifp)
618 u_long i, vifi_cnt = 0;
619 struct ifnet *free_ptr, *multi_leave;
623 if (V_ip_mrouter == NULL) {
629 * Tear down multicast forwarder state associated with this ifnet.
630 * 1. Walk the vif list, matching vifs against this ifnet.
631 * 2. Walk the multicast forwarding cache (mfc) looking for
632 * inner matches with this vif's index.
633 * 3. Expire any matching multicast forwarding cache entries.
634 * 4. Free vif state. This should disable ALLMULTI on the interface.
637 for (vifi = 0; vifi < V_numvifs; vifi++) {
638 if (V_viftable[vifi].v_ifp != ifp)
640 for (i = 0; i < mfchashsize; i++) {
641 struct mfc *rt, *nrt;
643 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
644 if (rt->mfc_parent == vifi) {
649 del_vif_locked(vifi, &multi_leave, &free_ptr);
650 if (free_ptr != NULL)
654 if_allmulti(multi_leave, 0);
663 * Free IFP. We don't have to use free_ptr here as it is the same
664 * that ifp. Perform free as many times as required in case
665 * refcount is greater than 1.
667 for (i = 0; i < vifi_cnt; i++)
672 ip_mrouter_upcall_thread(void *arg, int pending __unused)
674 CURVNET_SET((struct vnet *) arg);
684 * Enable multicast forwarding.
687 ip_mrouter_init(struct socket *so, int version)
690 CTR2(KTR_IPMF, "%s: so %p", __func__, so);
697 if (ip_mrouter_unloading) {
702 if (V_ip_mrouter != NULL) {
707 V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash,
710 /* Create upcall ring */
711 mtx_init(&V_bw_upcalls_ring_mtx, "mroute upcall buf_ring mtx", NULL, MTX_DEF);
712 V_bw_upcalls_ring = buf_ring_alloc(BW_UPCALLS_MAX, M_MRTABLE,
713 M_NOWAIT, &V_bw_upcalls_ring_mtx);
714 if (!V_bw_upcalls_ring) {
719 TASK_INIT(&V_task, 0, ip_mrouter_upcall_thread, curvnet);
720 taskqueue_cancel(V_task_queue, &V_task, NULL);
721 taskqueue_unblock(V_task_queue);
723 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
725 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
729 atomic_add_int(&ip_mrouter_cnt, 1);
731 /* This is a mutex required by buf_ring init, but not used internally */
732 mtx_init(&V_buf_ring_mtx, "mroute buf_ring mtx", NULL, MTX_DEF);
736 CTR1(KTR_IPMF, "%s: done", __func__);
742 * Disable multicast forwarding.
745 X_ip_mrouter_done(void)
751 struct bw_upcall *bu;
753 if (V_ip_mrouter == NULL)
757 * Detach/disable hooks to the reset of the system.
760 atomic_subtract_int(&ip_mrouter_cnt, 1);
761 V_mrt_api_config = 0;
764 * Wait for all epoch sections to complete to ensure
765 * V_ip_mrouter = NULL is visible to others.
767 epoch_wait_preempt(net_epoch_preempt);
769 /* Stop and drain task queue */
770 taskqueue_block(V_task_queue);
771 while (taskqueue_cancel(V_task_queue, &V_task, NULL)) {
772 taskqueue_drain(V_task_queue, &V_task);
775 ifps = malloc(MAXVIFS * sizeof(*ifps), M_TEMP, M_WAITOK);
778 taskqueue_cancel(V_task_queue, &V_task, NULL);
780 /* Destroy upcall ring */
781 while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
784 buf_ring_free(V_bw_upcalls_ring, M_MRTABLE);
785 mtx_destroy(&V_bw_upcalls_ring_mtx);
788 * For each phyint in use, prepare to disable promiscuous reception
789 * of all IP multicasts. Defer the actual call until the lock is released;
790 * just record the list of interfaces while locked. Some interfaces use
791 * sx locks in their ioctl routines, which is not allowed while holding
792 * a non-sleepable lock.
794 KASSERT(V_numvifs <= MAXVIFS, ("More vifs than possible"));
795 for (vifi = 0, nifp = 0; vifi < V_numvifs; vifi++) {
796 if (!in_nullhost(V_viftable[vifi].v_lcl_addr) &&
797 !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) {
798 ifps[nifp++] = V_viftable[vifi].v_ifp;
801 bzero((caddr_t)V_viftable, sizeof(*V_viftable) * MAXVIFS);
803 V_pim_assert_enabled = 0;
805 callout_stop(&V_expire_upcalls_ch);
806 callout_stop(&V_bw_upcalls_ch);
809 * Free all multicast forwarding cache entries.
810 * Do not use hashdestroy(), as we must perform other cleanup.
812 for (i = 0; i < mfchashsize; i++) {
813 struct mfc *rt, *nrt;
815 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
819 free(V_mfchashtbl, M_MRTABLE);
822 bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize);
824 V_reg_vif_num = VIFI_INVALID;
826 mtx_destroy(&V_buf_ring_mtx);
831 * Now drop our claim on promiscuous multicast on the interfaces recorded
832 * above. This is safe to do now because ALLMULTI is reference counted.
834 for (vifi = 0; vifi < nifp; vifi++)
835 if_allmulti(ifps[vifi], 0);
838 CTR1(KTR_IPMF, "%s: done", __func__);
844 * Set PIM assert processing global
849 if ((i != 1) && (i != 0))
852 V_pim_assert_enabled = i;
858 * Configure API capabilities
861 set_api_config(uint32_t *apival)
866 * We can set the API capabilities only if it is the first operation
867 * after MRT_INIT. I.e.:
868 * - there are no vifs installed
869 * - pim_assert is not enabled
870 * - the MFC table is empty
876 if (V_pim_assert_enabled) {
883 for (i = 0; i < mfchashsize; i++) {
884 if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) {
893 V_mrt_api_config = *apival & mrt_api_support;
894 *apival = V_mrt_api_config;
900 * Add a vif to the vif table
903 add_vif(struct vifctl *vifcp)
905 struct vif *vifp = V_viftable + vifcp->vifc_vifi;
906 struct sockaddr_in sin = {sizeof sin, AF_INET};
911 if (vifcp->vifc_vifi >= MAXVIFS)
913 /* rate limiting is no longer supported by this code */
914 if (vifcp->vifc_rate_limit != 0) {
915 log(LOG_ERR, "rate limiting is no longer supported\n");
919 if (in_nullhost(vifcp->vifc_lcl_addr))
920 return EADDRNOTAVAIL;
922 /* Find the interface with an address in AF_INET family */
923 if (vifcp->vifc_flags & VIFF_REGISTER) {
925 * XXX: Because VIFF_REGISTER does not really need a valid
926 * local interface (e.g. it could be 127.0.0.2), we don't
931 struct epoch_tracker et;
933 sin.sin_addr = vifcp->vifc_lcl_addr;
935 ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
938 return EADDRNOTAVAIL;
941 /* XXX FIXME we need to take a ref on ifp and cleanup properly! */
945 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {
946 CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__);
948 } else if (vifcp->vifc_flags & VIFF_REGISTER) {
949 ifp = V_multicast_register_if = if_alloc(IFT_LOOP);
950 CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp);
951 if (V_reg_vif_num == VIFI_INVALID) {
952 if_initname(V_multicast_register_if, "register_vif", 0);
953 V_reg_vif_num = vifcp->vifc_vifi;
955 } else { /* Make sure the interface supports multicast */
956 if ((ifp->if_flags & IFF_MULTICAST) == 0)
959 /* Enable promiscuous reception of all IP multicasts from the if */
960 error = if_allmulti(ifp, 1);
967 if (!in_nullhost(vifp->v_lcl_addr)) {
969 V_multicast_register_if = NULL;
976 vifp->v_flags = vifcp->vifc_flags;
977 vifp->v_threshold = vifcp->vifc_threshold;
978 vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
979 vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
981 /* initialize per vif pkt counters */
984 vifp->v_bytes_in = 0;
985 vifp->v_bytes_out = 0;
986 sprintf(vifp->v_spin_name, "BM[%d] spin", vifcp->vifc_vifi);
987 mtx_init(&vifp->v_spin, vifp->v_spin_name, NULL, MTX_SPIN);
989 /* Adjust numvifs up if the vifi is higher than numvifs */
990 if (V_numvifs <= vifcp->vifc_vifi)
991 V_numvifs = vifcp->vifc_vifi + 1;
995 CTR4(KTR_IPMF, "%s: add vif %d laddr 0x%08x thresh %x", __func__,
996 (int)vifcp->vifc_vifi, ntohl(vifcp->vifc_lcl_addr.s_addr),
997 (int)vifcp->vifc_threshold);
1003 * Delete a vif from the vif table
1006 del_vif_locked(vifi_t vifi, struct ifnet **ifp_multi_leave, struct ifnet **ifp_free)
1011 *ifp_multi_leave = NULL;
1015 if (vifi >= V_numvifs) {
1018 vifp = &V_viftable[vifi];
1019 if (in_nullhost(vifp->v_lcl_addr)) {
1020 return EADDRNOTAVAIL;
1023 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER)))
1024 *ifp_multi_leave = vifp->v_ifp;
1026 if (vifp->v_flags & VIFF_REGISTER) {
1027 V_reg_vif_num = VIFI_INVALID;
1029 if (vifp->v_ifp == V_multicast_register_if)
1030 V_multicast_register_if = NULL;
1031 *ifp_free = vifp->v_ifp;
1035 mtx_destroy(&vifp->v_spin);
1037 bzero((caddr_t)vifp, sizeof (*vifp));
1039 CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi);
1041 /* Adjust numvifs down */
1042 for (vifi = V_numvifs; vifi > 0; vifi--)
1043 if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr))
1051 del_vif(vifi_t vifi)
1054 struct ifnet *free_ptr, *multi_leave;
1057 cc = del_vif_locked(vifi, &multi_leave, &free_ptr);
1061 if_allmulti(multi_leave, 0);
1070 * update an mfc entry without resetting counters and S,G addresses.
1073 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
1077 rt->mfc_parent = mfccp->mfcc_parent;
1078 for (i = 0; i < V_numvifs; i++) {
1079 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
1080 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config &
1083 /* set the RP address */
1084 if (V_mrt_api_config & MRT_MFC_RP)
1085 rt->mfc_rp = mfccp->mfcc_rp;
1087 rt->mfc_rp.s_addr = INADDR_ANY;
1091 * fully initialize an mfc entry from the parameter.
1094 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
1096 rt->mfc_origin = mfccp->mfcc_origin;
1097 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
1099 update_mfc_params(rt, mfccp);
1101 /* initialize pkt counters per src-grp */
1102 rt->mfc_pkt_cnt = 0;
1103 rt->mfc_byte_cnt = 0;
1104 rt->mfc_wrong_if = 0;
1105 timevalclear(&rt->mfc_last_assert);
1109 expire_mfc(struct mfc *rt)
1115 free_bw_list(rt->mfc_bw_meter_leq);
1116 free_bw_list(rt->mfc_bw_meter_geq);
1118 while (!buf_ring_empty(rt->mfc_stall_ring)) {
1119 rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
1122 free(rte, M_MRTABLE);
1125 buf_ring_free(rt->mfc_stall_ring, M_MRTABLE);
1127 LIST_REMOVE(rt, mfc_hash);
1128 free(rt, M_MRTABLE);
1135 add_mfc(struct mfcctl2 *mfccp)
1141 struct epoch_tracker et;
1144 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp);
1146 /* If an entry already exists, just update the fields */
1148 CTR4(KTR_IPMF, "%s: update mfc orig 0x%08x group %lx parent %x",
1149 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1150 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1151 mfccp->mfcc_parent);
1152 update_mfc_params(rt, mfccp);
1158 * Find the entry for which the upcall was made and update
1161 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp);
1162 NET_EPOCH_ENTER(et);
1163 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1164 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1165 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) &&
1166 !buf_ring_empty(rt->mfc_stall_ring)) {
1168 "%s: add mfc orig 0x%08x group %lx parent %x qh %p",
1169 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1170 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1172 rt->mfc_stall_ring);
1174 CTR1(KTR_IPMF, "%s: multiple matches", __func__);
1176 init_mfc_params(rt, mfccp);
1177 rt->mfc_expire = 0; /* Don't clean this guy up */
1180 /* Free queued packets, but attempt to forward them first. */
1181 while (!buf_ring_empty(rt->mfc_stall_ring)) {
1182 rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
1183 if (rte->ifp != NULL)
1184 ip_mdq(rte->m, rte->ifp, rt, -1);
1186 free(rte, M_MRTABLE);
1193 * It is possible that an entry is being inserted without an upcall
1196 CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__);
1197 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1198 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1199 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) {
1200 init_mfc_params(rt, mfccp);
1208 if (rt == NULL) { /* no upcall, so make a new entry */
1215 init_mfc_params(rt, mfccp);
1218 rt->mfc_bw_meter_leq = NULL;
1219 rt->mfc_bw_meter_geq = NULL;
1221 /* insert new entry at head of hash chain */
1222 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1232 * Delete an mfc entry
1235 del_mfc(struct mfcctl2 *mfccp)
1237 struct in_addr origin;
1238 struct in_addr mcastgrp;
1241 origin = mfccp->mfcc_origin;
1242 mcastgrp = mfccp->mfcc_mcastgrp;
1244 CTR3(KTR_IPMF, "%s: delete mfc orig 0x%08x group %lx", __func__,
1245 ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
1249 rt = mfc_find(&origin, &mcastgrp);
1252 return EADDRNOTAVAIL;
1256 * free the bw_meter entries
1258 free_bw_list(rt->mfc_bw_meter_leq);
1259 rt->mfc_bw_meter_leq = NULL;
1260 free_bw_list(rt->mfc_bw_meter_geq);
1261 rt->mfc_bw_meter_geq = NULL;
1263 LIST_REMOVE(rt, mfc_hash);
1264 free(rt, M_MRTABLE);
1272 * Send a message to the routing daemon on the multicast routing socket.
1275 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src)
1278 SOCKBUF_LOCK(&s->so_rcv);
1279 if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm,
1281 sorwakeup_locked(s);
1284 soroverflow_locked(s);
1291 * IP multicast forwarding function. This function assumes that the packet
1292 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
1293 * pointed to by "ifp", and the packet is to be relayed to other networks
1294 * that have members of the packet's destination IP multicast group.
1296 * The packet is returned unscathed to the caller, unless it is
1297 * erroneous, in which case a non-zero return value tells the caller to
1301 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
1304 X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m,
1305 struct ip_moptions *imo)
1315 CTR3(KTR_IPMF, "ip_mforward: delete mfc orig 0x%08x group %lx ifp %p",
1316 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), ifp);
1318 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 ||
1319 ((u_char *)(ip + 1))[1] != IPOPT_LSRR) {
1321 * Packet arrived via a physical interface or
1322 * an encapsulated tunnel or a register_vif.
1326 * Packet arrived through a source-route tunnel.
1327 * Source-route tunnels are no longer supported.
1333 * BEGIN: MCAST ROUTING HOT PATH
1336 if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) {
1337 if (ip->ip_ttl < MAXTTL)
1338 ip->ip_ttl++; /* compensate for -1 in *_send routines */
1339 error = ip_mdq(m, ifp, NULL, vifi);
1345 * Don't forward a packet with time-to-live of zero or one,
1346 * or a packet destined to a local-only group.
1348 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) {
1355 * Determine forwarding vifs from the forwarding cache table
1357 MRTSTAT_INC(mrts_mfc_lookups);
1358 rt = mfc_find(&ip->ip_src, &ip->ip_dst);
1360 /* Entry exists, so forward if necessary */
1362 error = ip_mdq(m, ifp, rt, -1);
1363 /* Generic unlock here as we might release R or W lock */
1369 * END: MCAST ROUTING HOT PATH
1372 /* Further processing must be done with WLOCK taken */
1373 if ((MRW_WOWNED() == 0) && (MRW_LOCK_TRY_UPGRADE() == 0)) {
1376 goto mfc_find_retry;
1380 * If we don't have a route for packet's origin,
1381 * Make a copy of the packet & send message to routing daemon
1383 hlen = ip->ip_hl << 2;
1385 MRTSTAT_INC(mrts_mfc_misses);
1386 MRTSTAT_INC(mrts_no_route);
1387 CTR2(KTR_IPMF, "ip_mforward: no mfc for (0x%08x,%lx)",
1388 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr));
1391 * Allocate mbufs early so that we don't do extra work if we are
1392 * just going to fail anyway. Make sure to pullup the header so
1393 * that other people can't step on it.
1395 rte = malloc((sizeof *rte), M_MRTABLE, M_NOWAIT|M_ZERO);
1401 mb0 = m_copypacket(m, M_NOWAIT);
1402 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < hlen))
1403 mb0 = m_pullup(mb0, hlen);
1405 free(rte, M_MRTABLE);
1410 /* is there an upcall waiting for this flow ? */
1411 hash = MFCHASH(ip->ip_src, ip->ip_dst);
1412 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash)
1414 if (in_hosteq(ip->ip_src, rt->mfc_origin) &&
1415 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) &&
1416 !buf_ring_empty(rt->mfc_stall_ring))
1423 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1427 * Locate the vifi for the incoming interface for this packet.
1428 * If none found, drop packet.
1430 for (vifi = 0; vifi < V_numvifs &&
1431 V_viftable[vifi].v_ifp != ifp; vifi++)
1433 if (vifi >= V_numvifs) /* vif not found, drop packet */
1436 /* no upcall, so make a new entry */
1441 /* Make a copy of the header to send to the user level process */
1442 mm = m_copym(mb0, 0, hlen, M_NOWAIT);
1447 * Send message to routing daemon to install
1448 * a route into the kernel table
1451 im = mtod(mm, struct igmpmsg*);
1452 im->im_msgtype = IGMPMSG_NOCACHE;
1456 MRTSTAT_INC(mrts_upcalls);
1458 k_igmpsrc.sin_addr = ip->ip_src;
1459 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1460 CTR0(KTR_IPMF, "ip_mforward: socket queue full");
1461 MRTSTAT_INC(mrts_upq_sockfull);
1462 fail1: free(rt, M_MRTABLE);
1463 fail: free(rte, M_MRTABLE);
1469 /* insert new entry at head of hash chain */
1470 rt->mfc_origin.s_addr = ip->ip_src.s_addr;
1471 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
1472 rt->mfc_expire = UPCALL_EXPIRE;
1474 for (i = 0; i < V_numvifs; i++) {
1475 rt->mfc_ttls[i] = 0;
1476 rt->mfc_flags[i] = 0;
1478 rt->mfc_parent = -1;
1480 /* clear the RP address */
1481 rt->mfc_rp.s_addr = INADDR_ANY;
1482 rt->mfc_bw_meter_leq = NULL;
1483 rt->mfc_bw_meter_geq = NULL;
1485 /* initialize pkt counters per src-grp */
1486 rt->mfc_pkt_cnt = 0;
1487 rt->mfc_byte_cnt = 0;
1488 rt->mfc_wrong_if = 0;
1489 timevalclear(&rt->mfc_last_assert);
1491 buf_ring_enqueue(rt->mfc_stall_ring, rte);
1493 /* Add RT to hashtable as it didn't exist before */
1494 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1496 /* determine if queue has overflowed */
1497 if (buf_ring_full(rt->mfc_stall_ring)) {
1498 MRTSTAT_INC(mrts_upq_ovflw);
1499 non_fatal: free(rte, M_MRTABLE);
1505 buf_ring_enqueue(rt->mfc_stall_ring, rte);
1517 * Clean up the cache entry if upcall is not serviced
1520 expire_upcalls(void *arg)
1524 CURVNET_SET((struct vnet *) arg);
1526 /*This callout is always run with MRW_WLOCK taken. */
1528 for (i = 0; i < mfchashsize; i++) {
1529 struct mfc *rt, *nrt;
1531 if (V_nexpire[i] == 0)
1534 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
1535 if (buf_ring_empty(rt->mfc_stall_ring))
1538 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0)
1541 MRTSTAT_INC(mrts_cache_cleanups);
1542 CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__,
1543 (u_long)ntohl(rt->mfc_origin.s_addr),
1544 (u_long)ntohl(rt->mfc_mcastgrp.s_addr));
1550 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
1557 * Packet forwarding routine once entry in the cache is made
1560 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif)
1562 struct ip *ip = mtod(m, struct ip *);
1564 int plen = ntohs(ip->ip_len);
1570 * If xmt_vif is not -1, send on only the requested vif.
1572 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
1574 if (xmt_vif < V_numvifs) {
1575 if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER)
1576 pim_register_send(ip, V_viftable + xmt_vif, m, rt);
1578 phyint_send(ip, V_viftable + xmt_vif, m);
1583 * Don't forward if it didn't arrive from the parent vif for its origin.
1585 vifi = rt->mfc_parent;
1586 if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) {
1587 CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)",
1588 __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp);
1589 MRTSTAT_INC(mrts_wrong_if);
1592 * If we are doing PIM assert processing, send a message
1593 * to the routing daemon.
1595 * XXX: A PIM-SM router needs the WRONGVIF detection so it
1596 * can complete the SPT switch, regardless of the type
1597 * of the iif (broadcast media, GRE tunnel, etc).
1599 if (V_pim_assert_enabled && (vifi < V_numvifs) &&
1600 V_viftable[vifi].v_ifp) {
1601 if (ifp == V_multicast_register_if)
1602 PIMSTAT_INC(pims_rcv_registers_wrongiif);
1604 /* Get vifi for the incoming packet */
1605 for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp; vifi++)
1607 if (vifi >= V_numvifs)
1608 return 0; /* The iif is not found: ignore the packet. */
1610 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF)
1611 return 0; /* WRONGVIF disabled: ignore the packet */
1613 if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) {
1614 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1616 int hlen = ip->ip_hl << 2;
1617 struct mbuf *mm = m_copym(m, 0, hlen, M_NOWAIT);
1619 if (mm && (!M_WRITABLE(mm) || mm->m_len < hlen))
1620 mm = m_pullup(mm, hlen);
1624 im = mtod(mm, struct igmpmsg *);
1625 im->im_msgtype = IGMPMSG_WRONGVIF;
1629 MRTSTAT_INC(mrts_upcalls);
1631 k_igmpsrc.sin_addr = im->im_src;
1632 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1633 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
1634 MRTSTAT_INC(mrts_upq_sockfull);
1642 /* If I sourced this packet, it counts as output, else it was input. */
1643 mtx_lock_spin(&V_viftable[vifi].v_spin);
1644 if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) {
1645 V_viftable[vifi].v_pkt_out++;
1646 V_viftable[vifi].v_bytes_out += plen;
1648 V_viftable[vifi].v_pkt_in++;
1649 V_viftable[vifi].v_bytes_in += plen;
1651 mtx_unlock_spin(&V_viftable[vifi].v_spin);
1654 rt->mfc_byte_cnt += plen;
1657 * For each vif, decide if a copy of the packet should be forwarded.
1659 * - the ttl exceeds the vif's threshold
1660 * - there are group members downstream on interface
1662 for (vifi = 0; vifi < V_numvifs; vifi++)
1663 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) {
1664 V_viftable[vifi].v_pkt_out++;
1665 V_viftable[vifi].v_bytes_out += plen;
1666 if (V_viftable[vifi].v_flags & VIFF_REGISTER)
1667 pim_register_send(ip, V_viftable + vifi, m, rt);
1669 phyint_send(ip, V_viftable + vifi, m);
1673 * Perform upcall-related bw measuring.
1675 if ((rt->mfc_bw_meter_geq != NULL) || (rt->mfc_bw_meter_leq != NULL)) {
1680 /* Process meters for Greater-or-EQual case */
1681 for (x = rt->mfc_bw_meter_geq; x != NULL; x = x->bm_mfc_next)
1682 bw_meter_geq_receive_packet(x, plen, &now);
1684 /* Process meters for Lower-or-EQual case */
1685 for (x = rt->mfc_bw_meter_leq; x != NULL; x = x->bm_mfc_next) {
1687 * Record that a packet is received.
1688 * Spin lock has to be taken as callout context
1689 * (expire_bw_meter_leq) might modify these fields
1692 mtx_lock_spin(&x->bm_spin);
1693 x->bm_measured.b_packets++;
1694 x->bm_measured.b_bytes += plen;
1695 mtx_unlock_spin(&x->bm_spin);
1703 * Check if a vif number is legal/ok. This is used by in_mcast.c.
1706 X_legal_vif_num(int vif)
1715 if (vif < V_numvifs)
1723 * Return the local address used by this vif
1726 X_ip_mcast_src(int vifi)
1735 if (vifi < V_numvifs)
1736 addr = V_viftable[vifi].v_lcl_addr.s_addr;
1743 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
1745 struct mbuf *mb_copy;
1746 int hlen = ip->ip_hl << 2;
1751 * Make a new reference to the packet; make sure that
1752 * the IP header is actually copied, not just referenced,
1753 * so that ip_output() only scribbles on the copy.
1755 mb_copy = m_copypacket(m, M_NOWAIT);
1756 if (mb_copy && (!M_WRITABLE(mb_copy) || mb_copy->m_len < hlen))
1757 mb_copy = m_pullup(mb_copy, hlen);
1758 if (mb_copy == NULL)
1761 send_packet(vifp, mb_copy);
1765 send_packet(struct vif *vifp, struct mbuf *m)
1767 struct ip_moptions imo;
1773 imo.imo_multicast_ifp = vifp->v_ifp;
1774 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
1775 imo.imo_multicast_loop = !!in_mcast_loop;
1776 imo.imo_multicast_vif = -1;
1777 STAILQ_INIT(&imo.imo_head);
1780 * Re-entrancy should not be a problem here, because
1781 * the packets that we send out and are looped back at us
1782 * should get rejected because they appear to come from
1783 * the loopback interface, thus preventing looping.
1785 error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL);
1786 CTR3(KTR_IPMF, "%s: vif %td err %d", __func__,
1787 (ptrdiff_t)(vifp - V_viftable), error);
1791 * Stubs for old RSVP socket shim implementation.
1795 X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused)
1798 return (EOPNOTSUPP);
1802 X_ip_rsvp_force_done(struct socket *so __unused)
1808 X_rsvp_input(struct mbuf **mp, int *offp, int proto)
1816 return (IPPROTO_DONE);
1820 * Code for bandwidth monitors
1824 * Define common interface for timeval-related methods
1826 #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp)
1827 #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp))
1828 #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp))
1831 compute_bw_meter_flags(struct bw_upcall *req)
1835 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS)
1836 flags |= BW_METER_UNIT_PACKETS;
1837 if (req->bu_flags & BW_UPCALL_UNIT_BYTES)
1838 flags |= BW_METER_UNIT_BYTES;
1839 if (req->bu_flags & BW_UPCALL_GEQ)
1840 flags |= BW_METER_GEQ;
1841 if (req->bu_flags & BW_UPCALL_LEQ)
1842 flags |= BW_METER_LEQ;
1848 expire_bw_meter_leq(void *arg)
1850 struct bw_meter *x = arg;
1854 * callout is always executed with MRW_WLOCK taken
1857 CURVNET_SET((struct vnet *)x->arg);
1862 * Test if we should deliver an upcall
1864 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
1865 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) ||
1866 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
1867 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) {
1868 /* Prepare an upcall for delivery */
1869 bw_meter_prepare_upcall(x, &now);
1872 /* Send all upcalls that are pending delivery */
1873 taskqueue_enqueue(V_task_queue, &V_task);
1875 /* Reset counters */
1876 x->bm_start_time = now;
1877 /* Spin lock has to be taken as ip_forward context
1878 * might modify these fields as well
1880 mtx_lock_spin(&x->bm_spin);
1881 x->bm_measured.b_bytes = 0;
1882 x->bm_measured.b_packets = 0;
1883 mtx_unlock_spin(&x->bm_spin);
1885 callout_schedule(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time));
1891 * Add a bw_meter entry
1894 add_bw_upcall(struct bw_upcall *req)
1897 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC,
1898 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC };
1900 struct bw_meter *x, **bwm_ptr;
1903 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
1906 /* Test if the flags are valid */
1907 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES)))
1909 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)))
1911 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) == (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
1914 /* Test if the threshold time interval is valid */
1915 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <))
1918 flags = compute_bw_meter_flags(req);
1921 * Find if we have already same bw_meter entry
1924 mfc = mfc_find(&req->bu_src, &req->bu_dst);
1927 return EADDRNOTAVAIL;
1930 /* Choose an appropriate bw_meter list */
1931 if (req->bu_flags & BW_UPCALL_GEQ)
1932 bwm_ptr = &mfc->mfc_bw_meter_geq;
1934 bwm_ptr = &mfc->mfc_bw_meter_leq;
1936 for (x = *bwm_ptr; x != NULL; x = x->bm_mfc_next) {
1937 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
1938 &req->bu_threshold.b_time, ==))
1939 && (x->bm_threshold.b_packets
1940 == req->bu_threshold.b_packets)
1941 && (x->bm_threshold.b_bytes
1942 == req->bu_threshold.b_bytes)
1943 && (x->bm_flags & BW_METER_USER_FLAGS)
1946 return 0; /* XXX Already installed */
1950 /* Allocate the new bw_meter entry */
1951 x = malloc(sizeof(*x), M_BWMETER, M_ZERO | M_NOWAIT);
1957 /* Set the new bw_meter entry */
1958 x->bm_threshold.b_time = req->bu_threshold.b_time;
1960 x->bm_start_time = now;
1961 x->bm_threshold.b_packets = req->bu_threshold.b_packets;
1962 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes;
1963 x->bm_measured.b_packets = 0;
1964 x->bm_measured.b_bytes = 0;
1965 x->bm_flags = flags;
1966 x->bm_time_next = NULL;
1969 sprintf(x->bm_spin_name, "BM spin %p", x);
1970 mtx_init(&x->bm_spin, x->bm_spin_name, NULL, MTX_SPIN);
1972 /* For LEQ case create periodic callout */
1973 if (req->bu_flags & BW_UPCALL_LEQ) {
1974 callout_init_rw(&x->bm_meter_callout, &mrouter_lock, CALLOUT_SHAREDLOCK);
1975 callout_reset(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time),
1976 expire_bw_meter_leq, x);
1979 /* Add the new bw_meter entry to the front of entries for this MFC */
1980 x->bm_mfc_next = *bwm_ptr;
1989 free_bw_list(struct bw_meter *list)
1991 while (list != NULL) {
1992 struct bw_meter *x = list;
1994 /* MRW_WLOCK must be held here */
1995 if (x->bm_flags & BW_METER_LEQ) {
1996 callout_drain(&x->bm_meter_callout);
1997 mtx_destroy(&x->bm_spin);
2000 list = list->bm_mfc_next;
2006 * Delete one or multiple bw_meter entries
2009 del_bw_upcall(struct bw_upcall *req)
2012 struct bw_meter *x, **bwm_ptr;
2014 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
2019 /* Find the corresponding MFC entry */
2020 mfc = mfc_find(&req->bu_src, &req->bu_dst);
2023 return EADDRNOTAVAIL;
2024 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) {
2026 * Delete all bw_meter entries for this mfc
2028 struct bw_meter *list;
2031 list = mfc->mfc_bw_meter_leq;
2032 mfc->mfc_bw_meter_leq = NULL;
2036 list = mfc->mfc_bw_meter_geq;
2037 mfc->mfc_bw_meter_geq = NULL;
2041 } else { /* Delete a single bw_meter entry */
2042 struct bw_meter *prev;
2045 flags = compute_bw_meter_flags(req);
2047 /* Choose an appropriate bw_meter list */
2048 if (req->bu_flags & BW_UPCALL_GEQ)
2049 bwm_ptr = &mfc->mfc_bw_meter_geq;
2051 bwm_ptr = &mfc->mfc_bw_meter_leq;
2053 /* Find the bw_meter entry to delete */
2054 for (prev = NULL, x = *bwm_ptr; x != NULL;
2055 prev = x, x = x->bm_mfc_next) {
2056 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, &req->bu_threshold.b_time, ==)) &&
2057 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) &&
2058 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) &&
2059 (x->bm_flags & BW_METER_USER_FLAGS) == flags)
2062 if (x != NULL) { /* Delete entry from the list for this MFC */
2064 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/
2066 *bwm_ptr = x->bm_mfc_next;/* new head of list */
2068 if (req->bu_flags & BW_UPCALL_LEQ)
2069 callout_stop(&x->bm_meter_callout);
2072 /* Free the bw_meter entry */
2080 __assert_unreachable();
2084 * Perform bandwidth measurement processing that may result in an upcall
2087 bw_meter_geq_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp)
2089 struct timeval delta;
2094 BW_TIMEVALDECR(&delta, &x->bm_start_time);
2097 * Processing for ">=" type of bw_meter entry.
2098 * bm_spin does not have to be hold here as in GEQ
2099 * case this is the only context accessing bm_measured.
2101 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) {
2102 /* Reset the bw_meter entry */
2103 x->bm_start_time = *nowp;
2104 x->bm_measured.b_packets = 0;
2105 x->bm_measured.b_bytes = 0;
2106 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
2109 /* Record that a packet is received */
2110 x->bm_measured.b_packets++;
2111 x->bm_measured.b_bytes += plen;
2114 * Test if we should deliver an upcall
2116 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) {
2117 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
2118 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) ||
2119 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
2120 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) {
2121 /* Prepare an upcall for delivery */
2122 bw_meter_prepare_upcall(x, nowp);
2123 x->bm_flags |= BW_METER_UPCALL_DELIVERED;
2129 * Prepare a bandwidth-related upcall
2132 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp)
2134 struct timeval delta;
2135 struct bw_upcall *u;
2140 * Compute the measured time interval
2143 BW_TIMEVALDECR(&delta, &x->bm_start_time);
2146 * Set the bw_upcall entry
2148 u = malloc(sizeof(struct bw_upcall), M_MRTABLE, M_NOWAIT | M_ZERO);
2150 log(LOG_WARNING, "bw_meter_prepare_upcall: cannot allocate entry\n");
2153 u->bu_src = x->bm_mfc->mfc_origin;
2154 u->bu_dst = x->bm_mfc->mfc_mcastgrp;
2155 u->bu_threshold.b_time = x->bm_threshold.b_time;
2156 u->bu_threshold.b_packets = x->bm_threshold.b_packets;
2157 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes;
2158 u->bu_measured.b_time = delta;
2159 u->bu_measured.b_packets = x->bm_measured.b_packets;
2160 u->bu_measured.b_bytes = x->bm_measured.b_bytes;
2162 if (x->bm_flags & BW_METER_UNIT_PACKETS)
2163 u->bu_flags |= BW_UPCALL_UNIT_PACKETS;
2164 if (x->bm_flags & BW_METER_UNIT_BYTES)
2165 u->bu_flags |= BW_UPCALL_UNIT_BYTES;
2166 if (x->bm_flags & BW_METER_GEQ)
2167 u->bu_flags |= BW_UPCALL_GEQ;
2168 if (x->bm_flags & BW_METER_LEQ)
2169 u->bu_flags |= BW_UPCALL_LEQ;
2171 if (buf_ring_enqueue(V_bw_upcalls_ring, u))
2172 log(LOG_WARNING, "bw_meter_prepare_upcall: cannot enqueue upcall\n");
2173 if (buf_ring_count(V_bw_upcalls_ring) > (BW_UPCALLS_MAX / 2)) {
2174 taskqueue_enqueue(V_task_queue, &V_task);
2178 * Send the pending bandwidth-related upcalls
2181 bw_upcalls_send(void)
2185 struct bw_upcall *bu;
2186 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2187 static struct igmpmsg igmpmsg = {
2190 IGMPMSG_BW_UPCALL,/* im_msgtype */
2200 if (buf_ring_empty(V_bw_upcalls_ring))
2204 * Allocate a new mbuf, initialize it with the header and
2205 * the payload for the pending calls.
2207 m = m_gethdr(M_NOWAIT, MT_DATA);
2209 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n");
2213 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg);
2214 len += sizeof(struct igmpmsg);
2215 while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
2216 m_copyback(m, len, sizeof(struct bw_upcall), (caddr_t)bu);
2217 len += sizeof(struct bw_upcall);
2218 free(bu, M_MRTABLE);
2223 * XXX do we need to set the address in k_igmpsrc ?
2225 MRTSTAT_INC(mrts_upcalls);
2226 if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) {
2227 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n");
2228 MRTSTAT_INC(mrts_upq_sockfull);
2233 * A periodic function for sending all upcalls that are pending delivery
2236 expire_bw_upcalls_send(void *arg)
2238 CURVNET_SET((struct vnet *) arg);
2240 /* This callout is run with MRW_RLOCK taken */
2244 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
2250 * End of bandwidth monitoring code
2254 * Send the packet up to the user daemon, or eventually do kernel encapsulation
2258 pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m,
2261 struct mbuf *mb_copy, *mm;
2264 * Do not send IGMP_WHOLEPKT notifications to userland, if the
2265 * rendezvous point was unspecified, and we were told not to.
2267 if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) &&
2268 in_nullhost(rt->mfc_rp))
2271 mb_copy = pim_register_prepare(ip, m);
2272 if (mb_copy == NULL)
2276 * Send all the fragments. Note that the mbuf for each fragment
2277 * is freed by the sending machinery.
2279 for (mm = mb_copy; mm; mm = mb_copy) {
2280 mb_copy = mm->m_nextpkt;
2282 mm = m_pullup(mm, sizeof(struct ip));
2284 ip = mtod(mm, struct ip *);
2285 if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) {
2286 pim_register_send_rp(ip, vifp, mm, rt);
2288 pim_register_send_upcall(ip, vifp, mm, rt);
2297 * Return a copy of the data packet that is ready for PIM Register
2299 * XXX: Note that in the returned copy the IP header is a valid one.
2301 static struct mbuf *
2302 pim_register_prepare(struct ip *ip, struct mbuf *m)
2304 struct mbuf *mb_copy = NULL;
2307 /* Take care of delayed checksums */
2308 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2309 in_delayed_cksum(m);
2310 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2314 * Copy the old packet & pullup its IP header into the
2315 * new mbuf so we can modify it.
2317 mb_copy = m_copypacket(m, M_NOWAIT);
2318 if (mb_copy == NULL)
2320 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2);
2321 if (mb_copy == NULL)
2324 /* take care of the TTL */
2325 ip = mtod(mb_copy, struct ip *);
2328 /* Compute the MTU after the PIM Register encapsulation */
2329 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr);
2331 if (ntohs(ip->ip_len) <= mtu) {
2332 /* Turn the IP header into a valid one */
2334 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
2336 /* Fragment the packet */
2337 mb_copy->m_pkthdr.csum_flags |= CSUM_IP;
2338 if (ip_fragment(ip, &mb_copy, mtu, 0) != 0) {
2347 * Send an upcall with the data packet to the user-level process.
2350 pim_register_send_upcall(struct ip *ip, struct vif *vifp,
2351 struct mbuf *mb_copy, struct mfc *rt)
2353 struct mbuf *mb_first;
2354 int len = ntohs(ip->ip_len);
2356 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2361 * Add a new mbuf with an upcall header
2363 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2364 if (mb_first == NULL) {
2368 mb_first->m_data += max_linkhdr;
2369 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg);
2370 mb_first->m_len = sizeof(struct igmpmsg);
2371 mb_first->m_next = mb_copy;
2373 /* Send message to routing daemon */
2374 im = mtod(mb_first, struct igmpmsg *);
2375 im->im_msgtype = IGMPMSG_WHOLEPKT;
2377 im->im_vif = vifp - V_viftable;
2378 im->im_src = ip->ip_src;
2379 im->im_dst = ip->ip_dst;
2381 k_igmpsrc.sin_addr = ip->ip_src;
2383 MRTSTAT_INC(mrts_upcalls);
2385 if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) {
2386 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
2387 MRTSTAT_INC(mrts_upq_sockfull);
2391 /* Keep statistics */
2392 PIMSTAT_INC(pims_snd_registers_msgs);
2393 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2399 * Encapsulate the data packet in PIM Register message and send it to the RP.
2402 pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy,
2405 struct mbuf *mb_first;
2406 struct ip *ip_outer;
2407 struct pim_encap_pimhdr *pimhdr;
2408 int len = ntohs(ip->ip_len);
2409 vifi_t vifi = rt->mfc_parent;
2413 if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) {
2415 return EADDRNOTAVAIL; /* The iif vif is invalid */
2419 * Add a new mbuf with the encapsulating header
2421 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2422 if (mb_first == NULL) {
2426 mb_first->m_data += max_linkhdr;
2427 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr);
2428 mb_first->m_next = mb_copy;
2430 mb_first->m_pkthdr.len = len + mb_first->m_len;
2433 * Fill in the encapsulating IP and PIM header
2435 ip_outer = mtod(mb_first, struct ip *);
2436 *ip_outer = pim_encap_iphdr;
2437 ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) +
2438 sizeof(pim_encap_pimhdr));
2439 ip_outer->ip_src = V_viftable[vifi].v_lcl_addr;
2440 ip_outer->ip_dst = rt->mfc_rp;
2442 * Copy the inner header TOS to the outer header, and take care of the
2445 ip_outer->ip_tos = ip->ip_tos;
2446 if (ip->ip_off & htons(IP_DF))
2447 ip_outer->ip_off |= htons(IP_DF);
2448 ip_fillid(ip_outer);
2449 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer
2450 + sizeof(pim_encap_iphdr));
2451 *pimhdr = pim_encap_pimhdr;
2452 /* If the iif crosses a border, set the Border-bit */
2453 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config)
2454 pimhdr->flags |= htonl(PIM_BORDER_REGISTER);
2456 mb_first->m_data += sizeof(pim_encap_iphdr);
2457 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr));
2458 mb_first->m_data -= sizeof(pim_encap_iphdr);
2460 send_packet(vifp, mb_first);
2462 /* Keep statistics */
2463 PIMSTAT_INC(pims_snd_registers_msgs);
2464 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2470 * pim_encapcheck() is called by the encap4_input() path at runtime to
2471 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
2475 pim_encapcheck(const struct mbuf *m __unused, int off __unused,
2476 int proto __unused, void *arg __unused)
2479 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
2480 return (8); /* claim the datagram. */
2484 * PIM-SMv2 and PIM-DM messages processing.
2485 * Receives and verifies the PIM control messages, and passes them
2486 * up to the listening socket, using rip_input().
2487 * The only message with special processing is the PIM_REGISTER message
2488 * (used by PIM-SM): the PIM header is stripped off, and the inner packet
2489 * is passed to if_simloop().
2492 pim_input(struct mbuf *m, int off, int proto, void *arg __unused)
2494 struct ip *ip = mtod(m, struct ip *);
2498 int datalen = ntohs(ip->ip_len) - iphlen;
2501 /* Keep statistics */
2502 PIMSTAT_INC(pims_rcv_total_msgs);
2503 PIMSTAT_ADD(pims_rcv_total_bytes, datalen);
2508 if (datalen < PIM_MINLEN) {
2509 PIMSTAT_INC(pims_rcv_tooshort);
2510 CTR3(KTR_IPMF, "%s: short packet (%d) from 0x%08x",
2511 __func__, datalen, ntohl(ip->ip_src.s_addr));
2513 return (IPPROTO_DONE);
2517 * If the packet is at least as big as a REGISTER, go agead
2518 * and grab the PIM REGISTER header size, to avoid another
2519 * possible m_pullup() later.
2521 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8
2522 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28
2524 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN);
2526 * Get the IP and PIM headers in contiguous memory, and
2527 * possibly the PIM REGISTER header.
2529 if (m->m_len < minlen && (m = m_pullup(m, minlen)) == NULL) {
2530 CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__);
2531 return (IPPROTO_DONE);
2534 /* m_pullup() may have given us a new mbuf so reset ip. */
2535 ip = mtod(m, struct ip *);
2536 ip_tos = ip->ip_tos;
2538 /* adjust mbuf to point to the PIM header */
2539 m->m_data += iphlen;
2541 pim = mtod(m, struct pim *);
2544 * Validate checksum. If PIM REGISTER, exclude the data packet.
2546 * XXX: some older PIMv2 implementations don't make this distinction,
2547 * so for compatibility reason perform the checksum over part of the
2548 * message, and if error, then over the whole message.
2550 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) {
2551 /* do nothing, checksum okay */
2552 } else if (in_cksum(m, datalen)) {
2553 PIMSTAT_INC(pims_rcv_badsum);
2554 CTR1(KTR_IPMF, "%s: invalid checksum", __func__);
2556 return (IPPROTO_DONE);
2559 /* PIM version check */
2560 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) {
2561 PIMSTAT_INC(pims_rcv_badversion);
2562 CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__,
2563 (int)PIM_VT_V(pim->pim_vt), PIM_VERSION);
2565 return (IPPROTO_DONE);
2568 /* restore mbuf back to the outer IP */
2569 m->m_data -= iphlen;
2572 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) {
2574 * Since this is a REGISTER, we'll make a copy of the register
2575 * headers ip + pim + u_int32 + encap_ip, to be passed up to the
2578 struct sockaddr_in dst = { sizeof(dst), AF_INET };
2580 struct ip *encap_ip;
2585 if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) {
2587 CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__,
2588 (int)V_reg_vif_num);
2590 return (IPPROTO_DONE);
2592 /* XXX need refcnt? */
2593 vifp = V_viftable[V_reg_vif_num].v_ifp;
2599 if (datalen < PIM_REG_MINLEN) {
2600 PIMSTAT_INC(pims_rcv_tooshort);
2601 PIMSTAT_INC(pims_rcv_badregisters);
2602 CTR1(KTR_IPMF, "%s: register packet size too small", __func__);
2604 return (IPPROTO_DONE);
2607 reghdr = (u_int32_t *)(pim + 1);
2608 encap_ip = (struct ip *)(reghdr + 1);
2610 CTR3(KTR_IPMF, "%s: register: encap ip src 0x%08x len %d",
2611 __func__, ntohl(encap_ip->ip_src.s_addr),
2612 ntohs(encap_ip->ip_len));
2614 /* verify the version number of the inner packet */
2615 if (encap_ip->ip_v != IPVERSION) {
2616 PIMSTAT_INC(pims_rcv_badregisters);
2617 CTR1(KTR_IPMF, "%s: bad encap ip version", __func__);
2619 return (IPPROTO_DONE);
2622 /* verify the inner packet is destined to a mcast group */
2623 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) {
2624 PIMSTAT_INC(pims_rcv_badregisters);
2625 CTR2(KTR_IPMF, "%s: bad encap ip dest 0x%08x", __func__,
2626 ntohl(encap_ip->ip_dst.s_addr));
2628 return (IPPROTO_DONE);
2631 /* If a NULL_REGISTER, pass it to the daemon */
2632 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
2633 goto pim_input_to_daemon;
2636 * Copy the TOS from the outer IP header to the inner IP header.
2638 if (encap_ip->ip_tos != ip_tos) {
2639 /* Outer TOS -> inner TOS */
2640 encap_ip->ip_tos = ip_tos;
2641 /* Recompute the inner header checksum. Sigh... */
2643 /* adjust mbuf to point to the inner IP header */
2644 m->m_data += (iphlen + PIM_MINLEN);
2645 m->m_len -= (iphlen + PIM_MINLEN);
2647 encap_ip->ip_sum = 0;
2648 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2);
2650 /* restore mbuf to point back to the outer IP header */
2651 m->m_data -= (iphlen + PIM_MINLEN);
2652 m->m_len += (iphlen + PIM_MINLEN);
2656 * Decapsulate the inner IP packet and loopback to forward it
2657 * as a normal multicast packet. Also, make a copy of the
2658 * outer_iphdr + pimhdr + reghdr + encap_iphdr
2659 * to pass to the daemon later, so it can take the appropriate
2660 * actions (e.g., send back PIM_REGISTER_STOP).
2661 * XXX: here m->m_data points to the outer IP header.
2663 mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_NOWAIT);
2665 CTR1(KTR_IPMF, "%s: m_copym() failed", __func__);
2667 return (IPPROTO_DONE);
2670 /* Keep statistics */
2671 /* XXX: registers_bytes include only the encap. mcast pkt */
2672 PIMSTAT_INC(pims_rcv_registers_msgs);
2673 PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len));
2676 * forward the inner ip packet; point m_data at the inner ip.
2678 m_adj(m, iphlen + PIM_MINLEN);
2681 "%s: forward decap'd REGISTER: src %lx dst %lx vif %d",
2683 (u_long)ntohl(encap_ip->ip_src.s_addr),
2684 (u_long)ntohl(encap_ip->ip_dst.s_addr),
2685 (int)V_reg_vif_num);
2687 /* NB: vifp was collected above; can it change on us? */
2688 if_simloop(vifp, m, dst.sin_family, 0);
2690 /* prepare the register head to send to the mrouting daemon */
2694 pim_input_to_daemon:
2696 * Pass the PIM message up to the daemon; if it is a Register message,
2697 * pass the 'head' only up to the daemon. This includes the
2698 * outer IP header, PIM header, PIM-Register header and the
2700 * XXX: the outer IP header pkt size of a Register is not adjust to
2701 * reflect the fact that the inner multicast data is truncated.
2703 return (rip_input(&m, &off, proto));
2707 sysctl_mfctable(SYSCTL_HANDLER_ARGS)
2714 if (V_mfchashtbl == NULL) /* XXX unlocked */
2716 error = sysctl_wire_old_buffer(req, 0);
2721 for (i = 0; i < mfchashsize; i++) {
2722 LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) {
2723 error = SYSCTL_OUT(req, rt, sizeof(struct mfc));
2733 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable,
2734 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mfctable,
2735 "IPv4 Multicast Forwarding Table "
2736 "(struct *mfc[mfchashsize], netinet/ip_mroute.h)");
2739 sysctl_viflist(SYSCTL_HANDLER_ARGS)
2745 if (V_viftable == NULL) /* XXX unlocked */
2747 error = sysctl_wire_old_buffer(req, MROUTE_VIF_SYSCTL_LEN * MAXVIFS);
2752 /* Copy out user-visible portion of vif entry. */
2753 for (i = 0; i < MAXVIFS; i++) {
2754 error = SYSCTL_OUT(req, &V_viftable[i], MROUTE_VIF_SYSCTL_LEN);
2762 SYSCTL_PROC(_net_inet_ip, OID_AUTO, viftable,
2763 CTLTYPE_OPAQUE | CTLFLAG_VNET | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
2764 sysctl_viflist, "S,vif[MAXVIFS]",
2765 "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
2768 vnet_mroute_init(const void *unused __unused)
2771 V_nexpire = malloc(mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO);
2773 V_viftable = mallocarray(MAXVIFS, sizeof(*V_viftable),
2774 M_MRTABLE, M_WAITOK|M_ZERO);
2776 callout_init_rw(&V_expire_upcalls_ch, &mrouter_lock, 0);
2777 callout_init_rw(&V_bw_upcalls_ch, &mrouter_lock, 0);
2779 /* Prepare taskqueue */
2780 V_task_queue = taskqueue_create_fast("ip_mroute_tskq", M_NOWAIT,
2781 taskqueue_thread_enqueue, &V_task_queue);
2782 taskqueue_start_threads(&V_task_queue, 1, PI_NET, "ip_mroute_tskq task");
2785 VNET_SYSINIT(vnet_mroute_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_init,
2789 vnet_mroute_uninit(const void *unused __unused)
2792 /* Taskqueue should be cancelled and drained before freeing */
2793 taskqueue_free(V_task_queue);
2795 free(V_viftable, M_MRTABLE);
2796 free(V_nexpire, M_MRTABLE);
2800 VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE,
2801 vnet_mroute_uninit, NULL);
2804 ip_mroute_modevent(module_t mod, int type, void *unused)
2811 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2812 if_detached_event, NULL, EVENTHANDLER_PRI_ANY);
2813 if (if_detach_event_tag == NULL) {
2814 printf("ip_mroute: unable to register "
2815 "ifnet_departure_event handler\n");
2820 mfchashsize = MFCHASHSIZE;
2821 if (TUNABLE_ULONG_FETCH("net.inet.ip.mfchashsize", &mfchashsize) &&
2822 !powerof2(mfchashsize)) {
2823 printf("WARNING: %s not a power of 2; using default\n",
2824 "net.inet.ip.mfchashsize");
2825 mfchashsize = MFCHASHSIZE;
2828 pim_squelch_wholepkt = 0;
2829 TUNABLE_ULONG_FETCH("net.inet.pim.squelch_wholepkt",
2830 &pim_squelch_wholepkt);
2832 pim_encap_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
2834 ip_mcast_src = X_ip_mcast_src;
2835 ip_mforward = X_ip_mforward;
2836 ip_mrouter_done = X_ip_mrouter_done;
2837 ip_mrouter_get = X_ip_mrouter_get;
2838 ip_mrouter_set = X_ip_mrouter_set;
2840 ip_rsvp_force_done = X_ip_rsvp_force_done;
2841 ip_rsvp_vif = X_ip_rsvp_vif;
2843 legal_vif_num = X_legal_vif_num;
2844 mrt_ioctl = X_mrt_ioctl;
2845 rsvp_input_p = X_rsvp_input;
2850 * Typically module unload happens after the user-level
2851 * process has shutdown the kernel services (the check
2852 * below insures someone can't just yank the module out
2853 * from under a running process). But if the module is
2854 * just loaded and then unloaded w/o starting up a user
2855 * process we still need to cleanup.
2858 if (ip_mrouter_cnt != 0) {
2862 ip_mrouter_unloading = 1;
2865 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2867 if (pim_encap_cookie) {
2868 ip_encap_detach(pim_encap_cookie);
2869 pim_encap_cookie = NULL;
2872 ip_mcast_src = NULL;
2874 ip_mrouter_done = NULL;
2875 ip_mrouter_get = NULL;
2876 ip_mrouter_set = NULL;
2878 ip_rsvp_force_done = NULL;
2881 legal_vif_num = NULL;
2883 rsvp_input_p = NULL;
2894 static moduledata_t ip_mroutemod = {
2900 DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE);