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>
73 __FBSDID("$FreeBSD$");
76 #include "opt_mrouting.h"
80 #include <sys/types.h>
81 #include <sys/param.h>
82 #include <sys/kernel.h>
83 #include <sys/stddef.h>
84 #include <sys/condvar.h>
85 #include <sys/eventhandler.h>
87 #include <sys/kthread.h>
89 #include <sys/malloc.h>
91 #include <sys/module.h>
93 #include <sys/protosw.h>
94 #include <sys/signalvar.h>
95 #include <sys/socket.h>
96 #include <sys/socketvar.h>
97 #include <sys/sockio.h>
99 #include <sys/sysctl.h>
100 #include <sys/syslog.h>
101 #include <sys/systm.h>
102 #include <sys/time.h>
103 #include <sys/counter.h>
104 #include <machine/atomic.h>
107 #include <net/if_var.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_mtx;
145 #define MRW_RLOCK() rw_rlock(&mrouter_mtx)
146 #define MRW_WLOCK() rw_wlock(&mrouter_mtx)
147 #define MRW_RUNLOCK() rw_runlock(&mrouter_mtx)
148 #define MRW_WUNLOCK() rw_wunlock(&mrouter_mtx)
149 #define MRW_UNLOCK() rw_unlock(&mrouter_mtx)
150 #define MRW_LOCK_ASSERT() rw_assert(&mrouter_mtx, RA_LOCKED)
151 #define MRW_WLOCK_ASSERT() rw_assert(&mrouter_mtx, RA_WLOCKED)
152 #define MRW_LOCK_TRY_UPGRADE() rw_try_upgrade(&mrouter_mtx)
153 #define MRW_WOWNED() rw_wowned(&mrouter_mtx)
154 #define MRW_LOCK_INIT() \
155 rw_init(&mrouter_mtx, "IPv4 multicast forwarding")
156 #define MRW_LOCK_DESTROY() rw_destroy(&mrouter_mtx)
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)
181 VNET_DEFINE_STATIC(vifi_t, numvifs);
182 #define V_numvifs VNET(numvifs)
183 VNET_DEFINE_STATIC(struct vif *, viftable);
184 #define V_viftable VNET(viftable)
186 static eventhandler_tag if_detach_event_tag = NULL;
188 VNET_DEFINE_STATIC(struct callout, expire_upcalls_ch);
189 #define V_expire_upcalls_ch VNET(expire_upcalls_ch)
191 VNET_DEFINE_STATIC(struct mtx, upcall_thread_mtx);
192 #define V_upcall_thread_mtx VNET(upcall_thread_mtx)
194 VNET_DEFINE_STATIC(struct cv, upcall_thread_cv);
195 #define V_upcall_thread_cv VNET(upcall_thread_cv)
197 VNET_DEFINE_STATIC(struct mtx, buf_ring_mtx);
198 #define V_buf_ring_mtx VNET(buf_ring_mtx)
200 #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
201 #define UPCALL_EXPIRE 6 /* number of timeouts */
204 * Bandwidth meter variables and constants
206 static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters");
209 * Pending upcalls are stored in a ring which is flushed when
210 * full, or periodically
212 VNET_DEFINE_STATIC(struct callout, bw_upcalls_ch);
213 #define V_bw_upcalls_ch VNET(bw_upcalls_ch)
214 VNET_DEFINE_STATIC(struct buf_ring *, bw_upcalls_ring);
215 #define V_bw_upcalls_ring VNET(bw_upcalls_ring)
216 VNET_DEFINE_STATIC(struct mtx, bw_upcalls_ring_mtx);
217 #define V_bw_upcalls_ring_mtx VNET(bw_upcalls_ring_mtx)
219 #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */
221 VNET_PCPUSTAT_DEFINE_STATIC(struct pimstat, pimstat);
222 VNET_PCPUSTAT_SYSINIT(pimstat);
223 VNET_PCPUSTAT_SYSUNINIT(pimstat);
225 SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
227 SYSCTL_VNET_PCPUSTAT(_net_inet_pim, PIMCTL_STATS, stats, struct pimstat,
228 pimstat, "PIM Statistics (struct pimstat, netinet/pim_var.h)");
230 static u_long pim_squelch_wholepkt = 0;
231 SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RW,
232 &pim_squelch_wholepkt, 0,
233 "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified");
235 static volatile int upcall_thread_shutdown = 0;
237 static const struct encaptab *pim_encap_cookie;
238 static int pim_encapcheck(const struct mbuf *, int, int, void *);
239 static int pim_input(struct mbuf *, int, int, void *);
241 extern int in_mcast_loop;
243 static const struct encap_config ipv4_encap_cfg = {
244 .proto = IPPROTO_PIM,
245 .min_length = sizeof(struct ip) + PIM_MINLEN,
247 .check = pim_encapcheck,
252 * Note: the PIM Register encapsulation adds the following in front of a
255 * struct pim_encap_hdr {
257 * struct pim_encap_pimhdr pim;
262 struct pim_encap_pimhdr {
266 #define PIM_ENCAP_TTL 64
268 static struct ip pim_encap_iphdr = {
269 #if BYTE_ORDER == LITTLE_ENDIAN
270 sizeof(struct ip) >> 2,
274 sizeof(struct ip) >> 2,
277 sizeof(struct ip), /* total length */
285 static struct pim_encap_pimhdr pim_encap_pimhdr = {
287 PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */
294 VNET_DEFINE_STATIC(vifi_t, reg_vif_num) = VIFI_INVALID;
295 #define V_reg_vif_num VNET(reg_vif_num)
296 VNET_DEFINE_STATIC(struct ifnet *, multicast_register_if);
297 #define V_multicast_register_if VNET(multicast_register_if)
303 static u_long X_ip_mcast_src(int);
304 static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *,
305 struct ip_moptions *);
306 static int X_ip_mrouter_done(void);
307 static int X_ip_mrouter_get(struct socket *, struct sockopt *);
308 static int X_ip_mrouter_set(struct socket *, struct sockopt *);
309 static int X_legal_vif_num(int);
310 static int X_mrt_ioctl(u_long, caddr_t, int);
312 static int add_bw_upcall(struct bw_upcall *);
313 static int add_mfc(struct mfcctl2 *);
314 static int add_vif(struct vifctl *);
315 static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *);
316 static void bw_meter_geq_receive_packet(struct bw_meter *, int,
318 static void bw_upcalls_send(void);
319 static int del_bw_upcall(struct bw_upcall *);
320 static int del_mfc(struct mfcctl2 *);
321 static int del_vif(vifi_t);
322 static int del_vif_locked(vifi_t);
323 static void expire_bw_upcalls_send(void *);
324 static void expire_mfc(struct mfc *);
325 static void expire_upcalls(void *);
326 static void free_bw_list(struct bw_meter *);
327 static int get_sg_cnt(struct sioc_sg_req *);
328 static int get_vif_cnt(struct sioc_vif_req *);
329 static void if_detached_event(void *, struct ifnet *);
330 static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t);
331 static int ip_mrouter_init(struct socket *, int);
332 static __inline struct mfc *
333 mfc_find(struct in_addr *, struct in_addr *);
334 static void phyint_send(struct ip *, struct vif *, struct mbuf *);
336 pim_register_prepare(struct ip *, struct mbuf *);
337 static int pim_register_send(struct ip *, struct vif *,
338 struct mbuf *, struct mfc *);
339 static int pim_register_send_rp(struct ip *, struct vif *,
340 struct mbuf *, struct mfc *);
341 static int pim_register_send_upcall(struct ip *, struct vif *,
342 struct mbuf *, struct mfc *);
343 static void send_packet(struct vif *, struct mbuf *);
344 static int set_api_config(uint32_t *);
345 static int set_assert(int);
346 static int socket_send(struct socket *, struct mbuf *,
347 struct sockaddr_in *);
350 * Kernel multicast forwarding API capabilities and setup.
351 * If more API capabilities are added to the kernel, they should be
352 * recorded in `mrt_api_support'.
354 #define MRT_API_VERSION 0x0305
356 static const int mrt_api_version = MRT_API_VERSION;
357 static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF |
358 MRT_MFC_FLAGS_BORDER_VIF |
361 VNET_DEFINE_STATIC(uint32_t, mrt_api_config);
362 #define V_mrt_api_config VNET(mrt_api_config)
363 VNET_DEFINE_STATIC(int, pim_assert_enabled);
364 #define V_pim_assert_enabled VNET(pim_assert_enabled)
365 static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */
368 * Find a route for a given origin IP address and multicast group address.
369 * Statistics must be updated by the caller.
371 static __inline struct mfc *
372 mfc_find(struct in_addr *o, struct in_addr *g)
377 * Might be called both RLOCK and WLOCK.
378 * Check if any, it's caller responsibility
379 * to choose correct option.
383 LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) {
384 if (in_hosteq(rt->mfc_origin, *o) &&
385 in_hosteq(rt->mfc_mcastgrp, *g) &&
386 buf_ring_empty(rt->mfc_stall_ring))
393 static __inline struct mfc *
397 rt = (struct mfc*) malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT | M_ZERO);
401 rt->mfc_stall_ring = buf_ring_alloc(MAX_UPQ, M_MRTABLE,
402 M_NOWAIT, &V_buf_ring_mtx);
403 if (rt->mfc_stall_ring == NULL) {
412 * Handle MRT setsockopt commands to modify the multicast forwarding tables.
415 X_ip_mrouter_set(struct socket *so, struct sockopt *sopt)
421 struct bw_upcall bw_upcall;
424 if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT)
428 switch (sopt->sopt_name) {
430 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
433 error = ip_mrouter_init(so, optval);
437 error = ip_mrouter_done();
441 error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
444 error = add_vif(&vifc);
448 error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
451 error = del_vif(vifi);
457 * select data size depending on API version.
459 if (sopt->sopt_name == MRT_ADD_MFC &&
460 V_mrt_api_config & MRT_API_FLAGS_ALL) {
461 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2),
462 sizeof(struct mfcctl2));
464 error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl),
465 sizeof(struct mfcctl));
466 bzero((caddr_t)&mfc + sizeof(struct mfcctl),
467 sizeof(mfc) - sizeof(struct mfcctl));
471 if (sopt->sopt_name == MRT_ADD_MFC)
472 error = add_mfc(&mfc);
474 error = del_mfc(&mfc);
478 error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
485 error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
487 error = set_api_config(&i);
489 error = sooptcopyout(sopt, &i, sizeof i);
492 case MRT_ADD_BW_UPCALL:
493 case MRT_DEL_BW_UPCALL:
494 error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall,
498 if (sopt->sopt_name == MRT_ADD_BW_UPCALL)
499 error = add_bw_upcall(&bw_upcall);
501 error = del_bw_upcall(&bw_upcall);
512 * Handle MRT getsockopt commands
515 X_ip_mrouter_get(struct socket *so, struct sockopt *sopt)
519 switch (sopt->sopt_name) {
521 error = sooptcopyout(sopt, &mrt_api_version, sizeof mrt_api_version);
525 error = sooptcopyout(sopt, &V_pim_assert_enabled,
526 sizeof V_pim_assert_enabled);
529 case MRT_API_SUPPORT:
530 error = sooptcopyout(sopt, &mrt_api_support, sizeof mrt_api_support);
534 error = sooptcopyout(sopt, &V_mrt_api_config, sizeof V_mrt_api_config);
545 * Handle ioctl commands to obtain information from the cache
548 X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused)
553 * Currently the only function calling this ioctl routine is rtioctl_fib().
554 * Typically, only root can create the raw socket in order to execute
555 * this ioctl method, however the request might be coming from a prison
557 error = priv_check(curthread, PRIV_NETINET_MROUTE);
561 case (SIOCGETVIFCNT):
562 error = get_vif_cnt((struct sioc_vif_req *)data);
566 error = get_sg_cnt((struct sioc_sg_req *)data);
577 * returns the packet, byte, rpf-failure count for the source group provided
580 get_sg_cnt(struct sioc_sg_req *req)
585 rt = mfc_find(&req->src, &req->grp);
588 req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
589 return EADDRNOTAVAIL;
591 req->pktcnt = rt->mfc_pkt_cnt;
592 req->bytecnt = rt->mfc_byte_cnt;
593 req->wrong_if = rt->mfc_wrong_if;
599 * returns the input and output packet and byte counts on the vif provided
602 get_vif_cnt(struct sioc_vif_req *req)
604 vifi_t vifi = req->vifi;
607 if (vifi >= V_numvifs) {
612 mtx_lock_spin(&V_viftable[vifi].v_spin);
613 req->icount = V_viftable[vifi].v_pkt_in;
614 req->ocount = V_viftable[vifi].v_pkt_out;
615 req->ibytes = V_viftable[vifi].v_bytes_in;
616 req->obytes = V_viftable[vifi].v_bytes_out;
617 mtx_unlock_spin(&V_viftable[vifi].v_spin);
624 if_detached_event(void *arg __unused, struct ifnet *ifp)
631 if (V_ip_mrouter == NULL) {
637 * Tear down multicast forwarder state associated with this ifnet.
638 * 1. Walk the vif list, matching vifs against this ifnet.
639 * 2. Walk the multicast forwarding cache (mfc) looking for
640 * inner matches with this vif's index.
641 * 3. Expire any matching multicast forwarding cache entries.
642 * 4. Free vif state. This should disable ALLMULTI on the interface.
644 for (vifi = 0; vifi < V_numvifs; vifi++) {
645 if (V_viftable[vifi].v_ifp != ifp)
647 for (i = 0; i < mfchashsize; i++) {
648 struct mfc *rt, *nrt;
650 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
651 if (rt->mfc_parent == vifi) {
656 del_vif_locked(vifi);
663 ip_mrouter_upcall_thread(void *arg)
665 CURVNET_SET((struct vnet *) arg);
667 while (upcall_thread_shutdown == 0) {
668 /* START: Event loop */
670 /* END: Event loop */
671 mtx_lock(&V_upcall_thread_mtx);
672 cv_timedwait(&V_upcall_thread_cv, &V_upcall_thread_mtx, hz);
673 mtx_unlock(&V_upcall_thread_mtx);
676 upcall_thread_shutdown = 0;
682 * Enable multicast forwarding.
685 ip_mrouter_init(struct socket *so, int version)
688 CTR3(KTR_IPMF, "%s: so_type %d, pr_protocol %d", __func__,
689 so->so_type, so->so_proto->pr_protocol);
691 if (so->so_type != SOCK_RAW || so->so_proto->pr_protocol != IPPROTO_IGMP)
699 if (ip_mrouter_unloading) {
704 if (V_ip_mrouter != NULL) {
709 V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash,
712 /* Create upcall ring */
713 mtx_init(&V_bw_upcalls_ring_mtx, "mroute upcall buf_ring mtx", NULL, MTX_DEF);
714 V_bw_upcalls_ring = buf_ring_alloc(BW_UPCALLS_MAX, M_MRTABLE,
715 M_NOWAIT, &V_bw_upcalls_ring_mtx);
716 if (!V_bw_upcalls_ring) {
721 /* Create upcall thread */
722 upcall_thread_shutdown = 0;
723 mtx_init(&V_upcall_thread_mtx, "ip_mroute upcall thread mtx", NULL, MTX_DEF);
724 cv_init(&V_upcall_thread_cv, "ip_mroute upcall cv");
725 kthread_add(ip_mrouter_upcall_thread, curvnet,
726 NULL, NULL, 0, 0, "ip_mroute upcall thread");
728 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
730 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
734 atomic_add_int(&ip_mrouter_cnt, 1);
736 /* This is a mutex required by buf_ring init, but not used internally */
737 mtx_init(&V_buf_ring_mtx, "mroute buf_ring mtx", NULL, MTX_DEF);
741 CTR1(KTR_IPMF, "%s: done", __func__);
747 * Disable multicast forwarding.
750 X_ip_mrouter_done(void)
755 struct bw_upcall *bu;
757 if (V_ip_mrouter == NULL)
761 * Detach/disable hooks to the reset of the system.
764 atomic_subtract_int(&ip_mrouter_cnt, 1);
765 V_mrt_api_config = 0;
771 upcall_thread_shutdown = 1;
772 mtx_lock(&V_upcall_thread_mtx);
773 cv_signal(&V_upcall_thread_cv);
774 mtx_unlock(&V_upcall_thread_mtx);
776 /* Wait for thread shutdown */
777 while (upcall_thread_shutdown == 1) {};
779 mtx_destroy(&V_upcall_thread_mtx);
781 /* Destroy upcall ring */
782 while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
785 buf_ring_free(V_bw_upcalls_ring, M_MRTABLE);
786 mtx_destroy(&V_bw_upcalls_ring_mtx);
789 * For each phyint in use, disable promiscuous reception of all IP
792 for (vifi = 0; vifi < V_numvifs; vifi++) {
793 if (!in_nullhost(V_viftable[vifi].v_lcl_addr) &&
794 !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) {
795 ifp = V_viftable[vifi].v_ifp;
799 bzero((caddr_t)V_viftable, sizeof(*V_viftable) * MAXVIFS);
801 V_pim_assert_enabled = 0;
803 callout_stop(&V_expire_upcalls_ch);
804 callout_stop(&V_bw_upcalls_ch);
807 * Free all multicast forwarding cache entries.
808 * Do not use hashdestroy(), as we must perform other cleanup.
810 for (i = 0; i < mfchashsize; i++) {
811 struct mfc *rt, *nrt;
813 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
817 free(V_mfchashtbl, M_MRTABLE);
820 bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize);
822 V_reg_vif_num = VIFI_INVALID;
824 mtx_destroy(&V_buf_ring_mtx);
828 CTR1(KTR_IPMF, "%s: done", __func__);
834 * Set PIM assert processing global
839 if ((i != 1) && (i != 0))
842 V_pim_assert_enabled = i;
848 * Configure API capabilities
851 set_api_config(uint32_t *apival)
856 * We can set the API capabilities only if it is the first operation
857 * after MRT_INIT. I.e.:
858 * - there are no vifs installed
859 * - pim_assert is not enabled
860 * - the MFC table is empty
866 if (V_pim_assert_enabled) {
873 for (i = 0; i < mfchashsize; i++) {
874 if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) {
883 V_mrt_api_config = *apival & mrt_api_support;
884 *apival = V_mrt_api_config;
890 * Add a vif to the vif table
893 add_vif(struct vifctl *vifcp)
895 struct vif *vifp = V_viftable + vifcp->vifc_vifi;
896 struct sockaddr_in sin = {sizeof sin, AF_INET};
902 if (vifcp->vifc_vifi >= MAXVIFS)
904 /* rate limiting is no longer supported by this code */
905 if (vifcp->vifc_rate_limit != 0) {
906 log(LOG_ERR, "rate limiting is no longer supported\n");
910 if (in_nullhost(vifcp->vifc_lcl_addr))
911 return EADDRNOTAVAIL;
913 /* Find the interface with an address in AF_INET family */
914 if (vifcp->vifc_flags & VIFF_REGISTER) {
916 * XXX: Because VIFF_REGISTER does not really need a valid
917 * local interface (e.g. it could be 127.0.0.2), we don't
922 struct epoch_tracker et;
924 sin.sin_addr = vifcp->vifc_lcl_addr;
926 ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
929 return EADDRNOTAVAIL;
932 /* XXX FIXME we need to take a ref on ifp and cleanup properly! */
936 if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {
937 CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__);
939 } else if (vifcp->vifc_flags & VIFF_REGISTER) {
940 ifp = V_multicast_register_if = if_alloc(IFT_LOOP);
941 CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp);
942 if (V_reg_vif_num == VIFI_INVALID) {
943 if_initname(V_multicast_register_if, "register_vif", 0);
944 V_reg_vif_num = vifcp->vifc_vifi;
946 } else { /* Make sure the interface supports multicast */
947 if ((ifp->if_flags & IFF_MULTICAST) == 0)
950 /* Enable promiscuous reception of all IP multicasts from the if */
951 error = if_allmulti(ifp, 1);
958 if (!in_nullhost(vifp->v_lcl_addr)) {
960 V_multicast_register_if = NULL;
967 vifp->v_flags = vifcp->vifc_flags;
968 vifp->v_threshold = vifcp->vifc_threshold;
969 vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
970 vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
972 /* initialize per vif pkt counters */
975 vifp->v_bytes_in = 0;
976 vifp->v_bytes_out = 0;
977 sprintf(vifp->v_spin_name, "BM[%d] spin", vifcp->vifc_vifi);
978 mtx_init(&vifp->v_spin, vifp->v_spin_name, NULL, MTX_SPIN);
980 /* Adjust numvifs up if the vifi is higher than numvifs */
981 if (V_numvifs <= vifcp->vifc_vifi)
982 V_numvifs = vifcp->vifc_vifi + 1;
986 CTR4(KTR_IPMF, "%s: add vif %d laddr 0x%08x thresh %x", __func__,
987 (int)vifcp->vifc_vifi, ntohl(vifcp->vifc_lcl_addr.s_addr),
988 (int)vifcp->vifc_threshold);
994 * Delete a vif from the vif table
997 del_vif_locked(vifi_t vifi)
1003 if (vifi >= V_numvifs) {
1006 vifp = &V_viftable[vifi];
1007 if (in_nullhost(vifp->v_lcl_addr)) {
1008 return EADDRNOTAVAIL;
1011 if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER)))
1012 if_allmulti(vifp->v_ifp, 0);
1014 if (vifp->v_flags & VIFF_REGISTER) {
1015 V_reg_vif_num = VIFI_INVALID;
1017 if (vifp->v_ifp == V_multicast_register_if)
1018 V_multicast_register_if = NULL;
1019 if_free(vifp->v_ifp);
1023 mtx_destroy(&vifp->v_spin);
1025 bzero((caddr_t)vifp, sizeof (*vifp));
1027 CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi);
1029 /* Adjust numvifs down */
1030 for (vifi = V_numvifs; vifi > 0; vifi--)
1031 if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr))
1039 del_vif(vifi_t vifi)
1044 cc = del_vif_locked(vifi);
1051 * update an mfc entry without resetting counters and S,G addresses.
1054 update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
1058 rt->mfc_parent = mfccp->mfcc_parent;
1059 for (i = 0; i < V_numvifs; i++) {
1060 rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
1061 rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config &
1064 /* set the RP address */
1065 if (V_mrt_api_config & MRT_MFC_RP)
1066 rt->mfc_rp = mfccp->mfcc_rp;
1068 rt->mfc_rp.s_addr = INADDR_ANY;
1072 * fully initialize an mfc entry from the parameter.
1075 init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
1077 rt->mfc_origin = mfccp->mfcc_origin;
1078 rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
1080 update_mfc_params(rt, mfccp);
1082 /* initialize pkt counters per src-grp */
1083 rt->mfc_pkt_cnt = 0;
1084 rt->mfc_byte_cnt = 0;
1085 rt->mfc_wrong_if = 0;
1086 timevalclear(&rt->mfc_last_assert);
1090 expire_mfc(struct mfc *rt)
1096 free_bw_list(rt->mfc_bw_meter_leq);
1097 free_bw_list(rt->mfc_bw_meter_geq);
1099 while (!buf_ring_empty(rt->mfc_stall_ring)) {
1100 rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
1103 free(rte, M_MRTABLE);
1106 buf_ring_free(rt->mfc_stall_ring, M_MRTABLE);
1108 LIST_REMOVE(rt, mfc_hash);
1109 free(rt, M_MRTABLE);
1116 add_mfc(struct mfcctl2 *mfccp)
1124 rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp);
1126 /* If an entry already exists, just update the fields */
1128 CTR4(KTR_IPMF, "%s: update mfc orig 0x%08x group %lx parent %x",
1129 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1130 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1131 mfccp->mfcc_parent);
1132 update_mfc_params(rt, mfccp);
1138 * Find the entry for which the upcall was made and update
1141 hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp);
1142 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1143 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1144 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) &&
1145 !buf_ring_empty(rt->mfc_stall_ring)) {
1147 "%s: add mfc orig 0x%08x group %lx parent %x qh %p",
1148 __func__, ntohl(mfccp->mfcc_origin.s_addr),
1149 (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
1151 rt->mfc_stall_ring);
1153 CTR1(KTR_IPMF, "%s: multiple matches", __func__);
1155 init_mfc_params(rt, mfccp);
1156 rt->mfc_expire = 0; /* Don't clean this guy up */
1159 /* Free queued packets, but attempt to forward them first. */
1160 while (!buf_ring_empty(rt->mfc_stall_ring)) {
1161 rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
1162 if (rte->ifp != NULL)
1163 ip_mdq(rte->m, rte->ifp, rt, -1);
1165 free(rte, M_MRTABLE);
1171 * It is possible that an entry is being inserted without an upcall
1174 CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__);
1175 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
1176 if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
1177 in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) {
1178 init_mfc_params(rt, mfccp);
1186 if (rt == NULL) { /* no upcall, so make a new entry */
1193 init_mfc_params(rt, mfccp);
1196 rt->mfc_bw_meter_leq = NULL;
1197 rt->mfc_bw_meter_geq = NULL;
1199 /* insert new entry at head of hash chain */
1200 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1210 * Delete an mfc entry
1213 del_mfc(struct mfcctl2 *mfccp)
1215 struct in_addr origin;
1216 struct in_addr mcastgrp;
1219 origin = mfccp->mfcc_origin;
1220 mcastgrp = mfccp->mfcc_mcastgrp;
1222 CTR3(KTR_IPMF, "%s: delete mfc orig 0x%08x group %lx", __func__,
1223 ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
1227 rt = mfc_find(&origin, &mcastgrp);
1230 return EADDRNOTAVAIL;
1234 * free the bw_meter entries
1236 free_bw_list(rt->mfc_bw_meter_leq);
1237 rt->mfc_bw_meter_leq = NULL;
1238 free_bw_list(rt->mfc_bw_meter_geq);
1239 rt->mfc_bw_meter_geq = NULL;
1241 LIST_REMOVE(rt, mfc_hash);
1242 free(rt, M_MRTABLE);
1250 * Send a message to the routing daemon on the multicast routing socket.
1253 socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src)
1256 SOCKBUF_LOCK(&s->so_rcv);
1257 if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm,
1259 sorwakeup_locked(s);
1262 soroverflow_locked(s);
1269 * IP multicast forwarding function. This function assumes that the packet
1270 * pointed to by "ip" has arrived on (or is about to be sent to) the interface
1271 * pointed to by "ifp", and the packet is to be relayed to other networks
1272 * that have members of the packet's destination IP multicast group.
1274 * The packet is returned unscathed to the caller, unless it is
1275 * erroneous, in which case a non-zero return value tells the caller to
1279 #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
1282 X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m,
1283 struct ip_moptions *imo)
1293 CTR3(KTR_IPMF, "ip_mforward: delete mfc orig 0x%08x group %lx ifp %p",
1294 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), ifp);
1296 if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 ||
1297 ((u_char *)(ip + 1))[1] != IPOPT_LSRR) {
1299 * Packet arrived via a physical interface or
1300 * an encapsulated tunnel or a register_vif.
1304 * Packet arrived through a source-route tunnel.
1305 * Source-route tunnels are no longer supported.
1311 * BEGIN: MCAST ROUTING HOT PATH
1314 if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) {
1315 if (ip->ip_ttl < MAXTTL)
1316 ip->ip_ttl++; /* compensate for -1 in *_send routines */
1317 error = ip_mdq(m, ifp, NULL, vifi);
1323 * Don't forward a packet with time-to-live of zero or one,
1324 * or a packet destined to a local-only group.
1326 if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) {
1333 * Determine forwarding vifs from the forwarding cache table
1335 MRTSTAT_INC(mrts_mfc_lookups);
1336 rt = mfc_find(&ip->ip_src, &ip->ip_dst);
1338 /* Entry exists, so forward if necessary */
1340 error = ip_mdq(m, ifp, rt, -1);
1341 /* Generic unlock here as we might release R or W lock */
1347 * END: MCAST ROUTING HOT PATH
1350 /* Further processing must be done with WLOCK taken */
1351 if ((MRW_WOWNED() == 0) && (MRW_LOCK_TRY_UPGRADE() == 0)) {
1354 goto mfc_find_retry;
1358 * If we don't have a route for packet's origin,
1359 * Make a copy of the packet & send message to routing daemon
1361 hlen = ip->ip_hl << 2;
1363 MRTSTAT_INC(mrts_mfc_misses);
1364 MRTSTAT_INC(mrts_no_route);
1365 CTR2(KTR_IPMF, "ip_mforward: no mfc for (0x%08x,%lx)",
1366 ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr));
1369 * Allocate mbufs early so that we don't do extra work if we are
1370 * just going to fail anyway. Make sure to pullup the header so
1371 * that other people can't step on it.
1373 rte = (struct rtdetq*) malloc((sizeof *rte), M_MRTABLE,
1380 mb0 = m_copypacket(m, M_NOWAIT);
1381 if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < hlen))
1382 mb0 = m_pullup(mb0, hlen);
1384 free(rte, M_MRTABLE);
1389 /* is there an upcall waiting for this flow ? */
1390 hash = MFCHASH(ip->ip_src, ip->ip_dst);
1391 LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash)
1393 if (in_hosteq(ip->ip_src, rt->mfc_origin) &&
1394 in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) &&
1395 !buf_ring_empty(rt->mfc_stall_ring))
1402 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1406 * Locate the vifi for the incoming interface for this packet.
1407 * If none found, drop packet.
1409 for (vifi = 0; vifi < V_numvifs &&
1410 V_viftable[vifi].v_ifp != ifp; vifi++)
1412 if (vifi >= V_numvifs) /* vif not found, drop packet */
1415 /* no upcall, so make a new entry */
1420 /* Make a copy of the header to send to the user level process */
1421 mm = m_copym(mb0, 0, hlen, M_NOWAIT);
1426 * Send message to routing daemon to install
1427 * a route into the kernel table
1430 im = mtod(mm, struct igmpmsg*);
1431 im->im_msgtype = IGMPMSG_NOCACHE;
1435 MRTSTAT_INC(mrts_upcalls);
1437 k_igmpsrc.sin_addr = ip->ip_src;
1438 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1439 CTR0(KTR_IPMF, "ip_mforward: socket queue full");
1440 MRTSTAT_INC(mrts_upq_sockfull);
1441 fail1: free(rt, M_MRTABLE);
1442 fail: free(rte, M_MRTABLE);
1448 /* insert new entry at head of hash chain */
1449 rt->mfc_origin.s_addr = ip->ip_src.s_addr;
1450 rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
1451 rt->mfc_expire = UPCALL_EXPIRE;
1453 for (i = 0; i < V_numvifs; i++) {
1454 rt->mfc_ttls[i] = 0;
1455 rt->mfc_flags[i] = 0;
1457 rt->mfc_parent = -1;
1459 /* clear the RP address */
1460 rt->mfc_rp.s_addr = INADDR_ANY;
1461 rt->mfc_bw_meter_leq = NULL;
1462 rt->mfc_bw_meter_geq = NULL;
1464 /* initialize pkt counters per src-grp */
1465 rt->mfc_pkt_cnt = 0;
1466 rt->mfc_byte_cnt = 0;
1467 rt->mfc_wrong_if = 0;
1468 timevalclear(&rt->mfc_last_assert);
1470 buf_ring_enqueue(rt->mfc_stall_ring, rte);
1472 /* Add RT to hashtable as it didn't exist before */
1473 LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
1475 /* determine if queue has overflowed */
1476 if (buf_ring_full(rt->mfc_stall_ring)) {
1477 MRTSTAT_INC(mrts_upq_ovflw);
1478 non_fatal: free(rte, M_MRTABLE);
1484 buf_ring_enqueue(rt->mfc_stall_ring, rte);
1496 * Clean up the cache entry if upcall is not serviced
1499 expire_upcalls(void *arg)
1503 CURVNET_SET((struct vnet *) arg);
1505 /*This callout is always run with MRW_WLOCK taken. */
1507 for (i = 0; i < mfchashsize; i++) {
1508 struct mfc *rt, *nrt;
1510 if (V_nexpire[i] == 0)
1513 LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
1514 if (buf_ring_empty(rt->mfc_stall_ring))
1517 if (rt->mfc_expire == 0 || --rt->mfc_expire > 0)
1520 MRTSTAT_INC(mrts_cache_cleanups);
1521 CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__,
1522 (u_long)ntohl(rt->mfc_origin.s_addr),
1523 (u_long)ntohl(rt->mfc_mcastgrp.s_addr));
1529 callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
1536 * Packet forwarding routine once entry in the cache is made
1539 ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif)
1541 struct ip *ip = mtod(m, struct ip *);
1543 int plen = ntohs(ip->ip_len);
1548 * If xmt_vif is not -1, send on only the requested vif.
1550 * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
1552 if (xmt_vif < V_numvifs) {
1553 if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER)
1554 pim_register_send(ip, V_viftable + xmt_vif, m, rt);
1556 phyint_send(ip, V_viftable + xmt_vif, m);
1561 * Don't forward if it didn't arrive from the parent vif for its origin.
1563 vifi = rt->mfc_parent;
1564 if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) {
1565 CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)",
1566 __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp);
1567 MRTSTAT_INC(mrts_wrong_if);
1570 * If we are doing PIM assert processing, send a message
1571 * to the routing daemon.
1573 * XXX: A PIM-SM router needs the WRONGVIF detection so it
1574 * can complete the SPT switch, regardless of the type
1575 * of the iif (broadcast media, GRE tunnel, etc).
1577 if (V_pim_assert_enabled && (vifi < V_numvifs) &&
1578 V_viftable[vifi].v_ifp) {
1579 if (ifp == V_multicast_register_if)
1580 PIMSTAT_INC(pims_rcv_registers_wrongiif);
1582 /* Get vifi for the incoming packet */
1583 for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp;
1586 if (vifi >= V_numvifs)
1587 return 0; /* The iif is not found: ignore the packet. */
1589 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF)
1590 return 0; /* WRONGVIF disabled: ignore the packet */
1592 if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) {
1593 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
1595 int hlen = ip->ip_hl << 2;
1596 struct mbuf *mm = m_copym(m, 0, hlen, M_NOWAIT);
1598 if (mm && (!M_WRITABLE(mm) || mm->m_len < hlen))
1599 mm = m_pullup(mm, hlen);
1603 im = mtod(mm, struct igmpmsg *);
1604 im->im_msgtype = IGMPMSG_WRONGVIF;
1608 MRTSTAT_INC(mrts_upcalls);
1610 k_igmpsrc.sin_addr = im->im_src;
1611 if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
1612 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
1613 MRTSTAT_INC(mrts_upq_sockfull);
1621 /* If I sourced this packet, it counts as output, else it was input. */
1622 mtx_lock_spin(&V_viftable[vifi].v_spin);
1623 if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) {
1624 V_viftable[vifi].v_pkt_out++;
1625 V_viftable[vifi].v_bytes_out += plen;
1627 V_viftable[vifi].v_pkt_in++;
1628 V_viftable[vifi].v_bytes_in += plen;
1630 mtx_unlock_spin(&V_viftable[vifi].v_spin);
1633 rt->mfc_byte_cnt += plen;
1636 * For each vif, decide if a copy of the packet should be forwarded.
1638 * - the ttl exceeds the vif's threshold
1639 * - there are group members downstream on interface
1641 for (vifi = 0; vifi < V_numvifs; vifi++)
1642 if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) {
1643 V_viftable[vifi].v_pkt_out++;
1644 V_viftable[vifi].v_bytes_out += plen;
1645 if (V_viftable[vifi].v_flags & VIFF_REGISTER)
1646 pim_register_send(ip, V_viftable + vifi, m, rt);
1648 phyint_send(ip, V_viftable + vifi, m);
1652 * Perform upcall-related bw measuring.
1654 if ((rt->mfc_bw_meter_geq != NULL) || (rt->mfc_bw_meter_leq != NULL)) {
1659 /* Process meters for Greater-or-EQual case */
1660 for (x = rt->mfc_bw_meter_geq; x != NULL; x = x->bm_mfc_next)
1661 bw_meter_geq_receive_packet(x, plen, &now);
1663 /* Process meters for Lower-or-EQual case */
1664 for (x = rt->mfc_bw_meter_leq; x != NULL; x = x->bm_mfc_next) {
1666 * Record that a packet is received.
1667 * Spin lock has to be taken as callout context
1668 * (expire_bw_meter_leq) might modify these fields
1671 mtx_lock_spin(&x->bm_spin);
1672 x->bm_measured.b_packets++;
1673 x->bm_measured.b_bytes += plen;
1674 mtx_unlock_spin(&x->bm_spin);
1682 * Check if a vif number is legal/ok. This is used by in_mcast.c.
1685 X_legal_vif_num(int vif)
1694 if (vif < V_numvifs)
1702 * Return the local address used by this vif
1705 X_ip_mcast_src(int vifi)
1714 if (vifi < V_numvifs)
1715 addr = V_viftable[vifi].v_lcl_addr.s_addr;
1722 phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
1724 struct mbuf *mb_copy;
1725 int hlen = ip->ip_hl << 2;
1730 * Make a new reference to the packet; make sure that
1731 * the IP header is actually copied, not just referenced,
1732 * so that ip_output() only scribbles on the copy.
1734 mb_copy = m_copypacket(m, M_NOWAIT);
1735 if (mb_copy && (!M_WRITABLE(mb_copy) || mb_copy->m_len < hlen))
1736 mb_copy = m_pullup(mb_copy, hlen);
1737 if (mb_copy == NULL)
1740 send_packet(vifp, mb_copy);
1744 send_packet(struct vif *vifp, struct mbuf *m)
1746 struct ip_moptions imo;
1751 imo.imo_multicast_ifp = vifp->v_ifp;
1752 imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
1753 imo.imo_multicast_loop = !!in_mcast_loop;
1754 imo.imo_multicast_vif = -1;
1755 STAILQ_INIT(&imo.imo_head);
1758 * Re-entrancy should not be a problem here, because
1759 * the packets that we send out and are looped back at us
1760 * should get rejected because they appear to come from
1761 * the loopback interface, thus preventing looping.
1763 error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL);
1764 CTR3(KTR_IPMF, "%s: vif %td err %d", __func__,
1765 (ptrdiff_t)(vifp - V_viftable), error);
1769 * Stubs for old RSVP socket shim implementation.
1773 X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused)
1776 return (EOPNOTSUPP);
1780 X_ip_rsvp_force_done(struct socket *so __unused)
1786 X_rsvp_input(struct mbuf **mp, int *offp, int proto)
1794 return (IPPROTO_DONE);
1798 * Code for bandwidth monitors
1802 * Define common interface for timeval-related methods
1804 #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp)
1805 #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp))
1806 #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp))
1809 compute_bw_meter_flags(struct bw_upcall *req)
1813 if (req->bu_flags & BW_UPCALL_UNIT_PACKETS)
1814 flags |= BW_METER_UNIT_PACKETS;
1815 if (req->bu_flags & BW_UPCALL_UNIT_BYTES)
1816 flags |= BW_METER_UNIT_BYTES;
1817 if (req->bu_flags & BW_UPCALL_GEQ)
1818 flags |= BW_METER_GEQ;
1819 if (req->bu_flags & BW_UPCALL_LEQ)
1820 flags |= BW_METER_LEQ;
1826 expire_bw_meter_leq(void *arg)
1828 struct bw_meter *x = arg;
1832 * callout is always executed with MRW_WLOCK taken
1835 CURVNET_SET((struct vnet *)x->arg);
1840 * Test if we should deliver an upcall
1842 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
1843 (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) ||
1844 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
1845 (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) {
1846 /* Prepare an upcall for delivery */
1847 bw_meter_prepare_upcall(x, &now);
1850 /* Send all upcalls that are pending delivery */
1851 mtx_lock(&V_upcall_thread_mtx);
1852 cv_signal(&V_upcall_thread_cv);
1853 mtx_unlock(&V_upcall_thread_mtx);
1855 /* Reset counters */
1856 x->bm_start_time = now;
1857 /* Spin lock has to be taken as ip_forward context
1858 * might modify these fields as well
1860 mtx_lock_spin(&x->bm_spin);
1861 x->bm_measured.b_bytes = 0;
1862 x->bm_measured.b_packets = 0;
1863 mtx_unlock_spin(&x->bm_spin);
1865 callout_schedule(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time));
1871 * Add a bw_meter entry
1874 add_bw_upcall(struct bw_upcall *req)
1877 struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC,
1878 BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC };
1880 struct bw_meter *x, **bwm_ptr;
1883 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
1886 /* Test if the flags are valid */
1887 if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES)))
1889 if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)))
1891 if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
1892 == (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
1895 /* Test if the threshold time interval is valid */
1896 if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <))
1899 flags = compute_bw_meter_flags(req);
1902 * Find if we have already same bw_meter entry
1905 mfc = mfc_find(&req->bu_src, &req->bu_dst);
1908 return EADDRNOTAVAIL;
1911 /* Choose an appropriate bw_meter list */
1912 if (req->bu_flags & BW_UPCALL_GEQ)
1913 bwm_ptr = &mfc->mfc_bw_meter_geq;
1915 bwm_ptr = &mfc->mfc_bw_meter_leq;
1917 for (x = *bwm_ptr; x != NULL; x = x->bm_mfc_next) {
1918 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
1919 &req->bu_threshold.b_time, ==))
1920 && (x->bm_threshold.b_packets
1921 == req->bu_threshold.b_packets)
1922 && (x->bm_threshold.b_bytes
1923 == req->bu_threshold.b_bytes)
1924 && (x->bm_flags & BW_METER_USER_FLAGS)
1927 return 0; /* XXX Already installed */
1931 /* Allocate the new bw_meter entry */
1932 x = (struct bw_meter*) malloc(sizeof(*x), M_BWMETER,
1939 /* Set the new bw_meter entry */
1940 x->bm_threshold.b_time = req->bu_threshold.b_time;
1942 x->bm_start_time = now;
1943 x->bm_threshold.b_packets = req->bu_threshold.b_packets;
1944 x->bm_threshold.b_bytes = req->bu_threshold.b_bytes;
1945 x->bm_measured.b_packets = 0;
1946 x->bm_measured.b_bytes = 0;
1947 x->bm_flags = flags;
1948 x->bm_time_next = NULL;
1951 sprintf(x->bm_spin_name, "BM spin %p", x);
1952 mtx_init(&x->bm_spin, x->bm_spin_name, NULL, MTX_SPIN);
1954 /* For LEQ case create periodic callout */
1955 if (req->bu_flags & BW_UPCALL_LEQ) {
1956 callout_init_rw(&x->bm_meter_callout, &mrouter_mtx, CALLOUT_SHAREDLOCK);
1957 callout_reset(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time),
1958 expire_bw_meter_leq, x);
1961 /* Add the new bw_meter entry to the front of entries for this MFC */
1962 x->bm_mfc_next = *bwm_ptr;
1971 free_bw_list(struct bw_meter *list)
1973 while (list != NULL) {
1974 struct bw_meter *x = list;
1976 /* MRW_WLOCK must be held here */
1977 if (x->bm_flags & BW_METER_LEQ) {
1978 callout_drain(&x->bm_meter_callout);
1979 mtx_destroy(&x->bm_spin);
1982 list = list->bm_mfc_next;
1988 * Delete one or multiple bw_meter entries
1991 del_bw_upcall(struct bw_upcall *req)
1994 struct bw_meter *x, **bwm_ptr;
1996 if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
2001 /* Find the corresponding MFC entry */
2002 mfc = mfc_find(&req->bu_src, &req->bu_dst);
2005 return EADDRNOTAVAIL;
2006 } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) {
2008 * Delete all bw_meter entries for this mfc
2010 struct bw_meter *list;
2013 list = mfc->mfc_bw_meter_leq;
2014 mfc->mfc_bw_meter_leq = NULL;
2018 list = mfc->mfc_bw_meter_geq;
2019 mfc->mfc_bw_meter_geq = NULL;
2023 } else { /* Delete a single bw_meter entry */
2024 struct bw_meter *prev;
2027 flags = compute_bw_meter_flags(req);
2029 /* Choose an appropriate bw_meter list */
2030 if (req->bu_flags & BW_UPCALL_GEQ)
2031 bwm_ptr = &mfc->mfc_bw_meter_geq;
2033 bwm_ptr = &mfc->mfc_bw_meter_leq;
2035 /* Find the bw_meter entry to delete */
2036 for (prev = NULL, x = *bwm_ptr; x != NULL;
2037 prev = x, x = x->bm_mfc_next) {
2038 if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
2039 &req->bu_threshold.b_time, ==)) &&
2040 (x->bm_threshold.b_packets == req->bu_threshold.b_packets) &&
2041 (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) &&
2042 (x->bm_flags & BW_METER_USER_FLAGS) == flags)
2045 if (x != NULL) { /* Delete entry from the list for this MFC */
2047 prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/
2049 *bwm_ptr = x->bm_mfc_next;/* new head of list */
2051 if (req->bu_flags & BW_UPCALL_LEQ)
2052 callout_stop(&x->bm_meter_callout);
2055 /* Free the bw_meter entry */
2067 * Perform bandwidth measurement processing that may result in an upcall
2070 bw_meter_geq_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp)
2072 struct timeval delta;
2077 BW_TIMEVALDECR(&delta, &x->bm_start_time);
2080 * Processing for ">=" type of bw_meter entry.
2081 * bm_spin does not have to be hold here as in GEQ
2082 * case this is the only context accessing bm_measured.
2084 if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) {
2085 /* Reset the bw_meter entry */
2086 x->bm_start_time = *nowp;
2087 x->bm_measured.b_packets = 0;
2088 x->bm_measured.b_bytes = 0;
2089 x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
2092 /* Record that a packet is received */
2093 x->bm_measured.b_packets++;
2094 x->bm_measured.b_bytes += plen;
2097 * Test if we should deliver an upcall
2099 if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) {
2100 if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
2101 (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) ||
2102 ((x->bm_flags & BW_METER_UNIT_BYTES) &&
2103 (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) {
2104 /* Prepare an upcall for delivery */
2105 bw_meter_prepare_upcall(x, nowp);
2106 x->bm_flags |= BW_METER_UPCALL_DELIVERED;
2112 * Prepare a bandwidth-related upcall
2115 bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp)
2117 struct timeval delta;
2118 struct bw_upcall *u;
2123 * Compute the measured time interval
2126 BW_TIMEVALDECR(&delta, &x->bm_start_time);
2129 * Set the bw_upcall entry
2131 u = malloc(sizeof(struct bw_upcall), M_MRTABLE, M_NOWAIT | M_ZERO);
2133 log(LOG_WARNING, "bw_meter_prepare_upcall: cannot allocate entry\n");
2136 u->bu_src = x->bm_mfc->mfc_origin;
2137 u->bu_dst = x->bm_mfc->mfc_mcastgrp;
2138 u->bu_threshold.b_time = x->bm_threshold.b_time;
2139 u->bu_threshold.b_packets = x->bm_threshold.b_packets;
2140 u->bu_threshold.b_bytes = x->bm_threshold.b_bytes;
2141 u->bu_measured.b_time = delta;
2142 u->bu_measured.b_packets = x->bm_measured.b_packets;
2143 u->bu_measured.b_bytes = x->bm_measured.b_bytes;
2145 if (x->bm_flags & BW_METER_UNIT_PACKETS)
2146 u->bu_flags |= BW_UPCALL_UNIT_PACKETS;
2147 if (x->bm_flags & BW_METER_UNIT_BYTES)
2148 u->bu_flags |= BW_UPCALL_UNIT_BYTES;
2149 if (x->bm_flags & BW_METER_GEQ)
2150 u->bu_flags |= BW_UPCALL_GEQ;
2151 if (x->bm_flags & BW_METER_LEQ)
2152 u->bu_flags |= BW_UPCALL_LEQ;
2154 if (buf_ring_enqueue(V_bw_upcalls_ring, u))
2155 log(LOG_WARNING, "bw_meter_prepare_upcall: cannot enqueue upcall\n");
2156 if (buf_ring_count(V_bw_upcalls_ring) > (BW_UPCALLS_MAX / 2)) {
2157 mtx_lock(&V_upcall_thread_mtx);
2158 cv_signal(&V_upcall_thread_cv);
2159 mtx_unlock(&V_upcall_thread_mtx);
2163 * Send the pending bandwidth-related upcalls
2166 bw_upcalls_send(void)
2170 struct bw_upcall *bu;
2171 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2172 static struct igmpmsg igmpmsg = { 0, /* unused1 */
2174 IGMPMSG_BW_UPCALL,/* im_msgtype */
2179 { 0 } }; /* im_dst */
2183 if (buf_ring_empty(V_bw_upcalls_ring))
2187 * Allocate a new mbuf, initialize it with the header and
2188 * the payload for the pending calls.
2190 m = m_gethdr(M_NOWAIT, MT_DATA);
2192 log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n");
2196 m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg);
2197 len += sizeof(struct igmpmsg);
2198 while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
2199 m_copyback(m, len, sizeof(struct bw_upcall), (caddr_t)bu);
2200 len += sizeof(struct bw_upcall);
2201 free(bu, M_MRTABLE);
2206 * XXX do we need to set the address in k_igmpsrc ?
2208 MRTSTAT_INC(mrts_upcalls);
2209 if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) {
2210 log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n");
2211 MRTSTAT_INC(mrts_upq_sockfull);
2216 * A periodic function for sending all upcalls that are pending delivery
2219 expire_bw_upcalls_send(void *arg)
2221 CURVNET_SET((struct vnet *) arg);
2223 /* This callout is run with MRW_RLOCK taken */
2227 callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
2233 * End of bandwidth monitoring code
2237 * Send the packet up to the user daemon, or eventually do kernel encapsulation
2241 pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m,
2244 struct mbuf *mb_copy, *mm;
2247 * Do not send IGMP_WHOLEPKT notifications to userland, if the
2248 * rendezvous point was unspecified, and we were told not to.
2250 if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) &&
2251 in_nullhost(rt->mfc_rp))
2254 mb_copy = pim_register_prepare(ip, m);
2255 if (mb_copy == NULL)
2259 * Send all the fragments. Note that the mbuf for each fragment
2260 * is freed by the sending machinery.
2262 for (mm = mb_copy; mm; mm = mb_copy) {
2263 mb_copy = mm->m_nextpkt;
2265 mm = m_pullup(mm, sizeof(struct ip));
2267 ip = mtod(mm, struct ip *);
2268 if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) {
2269 pim_register_send_rp(ip, vifp, mm, rt);
2271 pim_register_send_upcall(ip, vifp, mm, rt);
2280 * Return a copy of the data packet that is ready for PIM Register
2282 * XXX: Note that in the returned copy the IP header is a valid one.
2284 static struct mbuf *
2285 pim_register_prepare(struct ip *ip, struct mbuf *m)
2287 struct mbuf *mb_copy = NULL;
2290 /* Take care of delayed checksums */
2291 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2292 in_delayed_cksum(m);
2293 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2297 * Copy the old packet & pullup its IP header into the
2298 * new mbuf so we can modify it.
2300 mb_copy = m_copypacket(m, M_NOWAIT);
2301 if (mb_copy == NULL)
2303 mb_copy = m_pullup(mb_copy, ip->ip_hl << 2);
2304 if (mb_copy == NULL)
2307 /* take care of the TTL */
2308 ip = mtod(mb_copy, struct ip *);
2311 /* Compute the MTU after the PIM Register encapsulation */
2312 mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr);
2314 if (ntohs(ip->ip_len) <= mtu) {
2315 /* Turn the IP header into a valid one */
2317 ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
2319 /* Fragment the packet */
2320 mb_copy->m_pkthdr.csum_flags |= CSUM_IP;
2321 if (ip_fragment(ip, &mb_copy, mtu, 0) != 0) {
2330 * Send an upcall with the data packet to the user-level process.
2333 pim_register_send_upcall(struct ip *ip, struct vif *vifp,
2334 struct mbuf *mb_copy, struct mfc *rt)
2336 struct mbuf *mb_first;
2337 int len = ntohs(ip->ip_len);
2339 struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
2344 * Add a new mbuf with an upcall header
2346 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2347 if (mb_first == NULL) {
2351 mb_first->m_data += max_linkhdr;
2352 mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg);
2353 mb_first->m_len = sizeof(struct igmpmsg);
2354 mb_first->m_next = mb_copy;
2356 /* Send message to routing daemon */
2357 im = mtod(mb_first, struct igmpmsg *);
2358 im->im_msgtype = IGMPMSG_WHOLEPKT;
2360 im->im_vif = vifp - V_viftable;
2361 im->im_src = ip->ip_src;
2362 im->im_dst = ip->ip_dst;
2364 k_igmpsrc.sin_addr = ip->ip_src;
2366 MRTSTAT_INC(mrts_upcalls);
2368 if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) {
2369 CTR1(KTR_IPMF, "%s: socket queue full", __func__);
2370 MRTSTAT_INC(mrts_upq_sockfull);
2374 /* Keep statistics */
2375 PIMSTAT_INC(pims_snd_registers_msgs);
2376 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2382 * Encapsulate the data packet in PIM Register message and send it to the RP.
2385 pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy,
2388 struct mbuf *mb_first;
2389 struct ip *ip_outer;
2390 struct pim_encap_pimhdr *pimhdr;
2391 int len = ntohs(ip->ip_len);
2392 vifi_t vifi = rt->mfc_parent;
2396 if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) {
2398 return EADDRNOTAVAIL; /* The iif vif is invalid */
2402 * Add a new mbuf with the encapsulating header
2404 mb_first = m_gethdr(M_NOWAIT, MT_DATA);
2405 if (mb_first == NULL) {
2409 mb_first->m_data += max_linkhdr;
2410 mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr);
2411 mb_first->m_next = mb_copy;
2413 mb_first->m_pkthdr.len = len + mb_first->m_len;
2416 * Fill in the encapsulating IP and PIM header
2418 ip_outer = mtod(mb_first, struct ip *);
2419 *ip_outer = pim_encap_iphdr;
2420 ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) +
2421 sizeof(pim_encap_pimhdr));
2422 ip_outer->ip_src = V_viftable[vifi].v_lcl_addr;
2423 ip_outer->ip_dst = rt->mfc_rp;
2425 * Copy the inner header TOS to the outer header, and take care of the
2428 ip_outer->ip_tos = ip->ip_tos;
2429 if (ip->ip_off & htons(IP_DF))
2430 ip_outer->ip_off |= htons(IP_DF);
2431 ip_fillid(ip_outer);
2432 pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer
2433 + sizeof(pim_encap_iphdr));
2434 *pimhdr = pim_encap_pimhdr;
2435 /* If the iif crosses a border, set the Border-bit */
2436 if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config)
2437 pimhdr->flags |= htonl(PIM_BORDER_REGISTER);
2439 mb_first->m_data += sizeof(pim_encap_iphdr);
2440 pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr));
2441 mb_first->m_data -= sizeof(pim_encap_iphdr);
2443 send_packet(vifp, mb_first);
2445 /* Keep statistics */
2446 PIMSTAT_INC(pims_snd_registers_msgs);
2447 PIMSTAT_ADD(pims_snd_registers_bytes, len);
2453 * pim_encapcheck() is called by the encap4_input() path at runtime to
2454 * determine if a packet is for PIM; allowing PIM to be dynamically loaded
2458 pim_encapcheck(const struct mbuf *m __unused, int off __unused,
2459 int proto __unused, void *arg __unused)
2462 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
2463 return (8); /* claim the datagram. */
2467 * PIM-SMv2 and PIM-DM messages processing.
2468 * Receives and verifies the PIM control messages, and passes them
2469 * up to the listening socket, using rip_input().
2470 * The only message with special processing is the PIM_REGISTER message
2471 * (used by PIM-SM): the PIM header is stripped off, and the inner packet
2472 * is passed to if_simloop().
2475 pim_input(struct mbuf *m, int off, int proto, void *arg __unused)
2477 struct ip *ip = mtod(m, struct ip *);
2481 int datalen = ntohs(ip->ip_len) - iphlen;
2484 /* Keep statistics */
2485 PIMSTAT_INC(pims_rcv_total_msgs);
2486 PIMSTAT_ADD(pims_rcv_total_bytes, datalen);
2491 if (datalen < PIM_MINLEN) {
2492 PIMSTAT_INC(pims_rcv_tooshort);
2493 CTR3(KTR_IPMF, "%s: short packet (%d) from 0x%08x",
2494 __func__, datalen, ntohl(ip->ip_src.s_addr));
2496 return (IPPROTO_DONE);
2500 * If the packet is at least as big as a REGISTER, go agead
2501 * and grab the PIM REGISTER header size, to avoid another
2502 * possible m_pullup() later.
2504 * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8
2505 * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28
2507 minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN);
2509 * Get the IP and PIM headers in contiguous memory, and
2510 * possibly the PIM REGISTER header.
2512 if (m->m_len < minlen && (m = m_pullup(m, minlen)) == NULL) {
2513 CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__);
2514 return (IPPROTO_DONE);
2517 /* m_pullup() may have given us a new mbuf so reset ip. */
2518 ip = mtod(m, struct ip *);
2519 ip_tos = ip->ip_tos;
2521 /* adjust mbuf to point to the PIM header */
2522 m->m_data += iphlen;
2524 pim = mtod(m, struct pim *);
2527 * Validate checksum. If PIM REGISTER, exclude the data packet.
2529 * XXX: some older PIMv2 implementations don't make this distinction,
2530 * so for compatibility reason perform the checksum over part of the
2531 * message, and if error, then over the whole message.
2533 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) {
2534 /* do nothing, checksum okay */
2535 } else if (in_cksum(m, datalen)) {
2536 PIMSTAT_INC(pims_rcv_badsum);
2537 CTR1(KTR_IPMF, "%s: invalid checksum", __func__);
2539 return (IPPROTO_DONE);
2542 /* PIM version check */
2543 if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) {
2544 PIMSTAT_INC(pims_rcv_badversion);
2545 CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__,
2546 (int)PIM_VT_V(pim->pim_vt), PIM_VERSION);
2548 return (IPPROTO_DONE);
2551 /* restore mbuf back to the outer IP */
2552 m->m_data -= iphlen;
2555 if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) {
2557 * Since this is a REGISTER, we'll make a copy of the register
2558 * headers ip + pim + u_int32 + encap_ip, to be passed up to the
2561 struct sockaddr_in dst = { sizeof(dst), AF_INET };
2563 struct ip *encap_ip;
2568 if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) {
2570 CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__,
2571 (int)V_reg_vif_num);
2573 return (IPPROTO_DONE);
2575 /* XXX need refcnt? */
2576 vifp = V_viftable[V_reg_vif_num].v_ifp;
2582 if (datalen < PIM_REG_MINLEN) {
2583 PIMSTAT_INC(pims_rcv_tooshort);
2584 PIMSTAT_INC(pims_rcv_badregisters);
2585 CTR1(KTR_IPMF, "%s: register packet size too small", __func__);
2587 return (IPPROTO_DONE);
2590 reghdr = (u_int32_t *)(pim + 1);
2591 encap_ip = (struct ip *)(reghdr + 1);
2593 CTR3(KTR_IPMF, "%s: register: encap ip src 0x%08x len %d",
2594 __func__, ntohl(encap_ip->ip_src.s_addr),
2595 ntohs(encap_ip->ip_len));
2597 /* verify the version number of the inner packet */
2598 if (encap_ip->ip_v != IPVERSION) {
2599 PIMSTAT_INC(pims_rcv_badregisters);
2600 CTR1(KTR_IPMF, "%s: bad encap ip version", __func__);
2602 return (IPPROTO_DONE);
2605 /* verify the inner packet is destined to a mcast group */
2606 if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) {
2607 PIMSTAT_INC(pims_rcv_badregisters);
2608 CTR2(KTR_IPMF, "%s: bad encap ip dest 0x%08x", __func__,
2609 ntohl(encap_ip->ip_dst.s_addr));
2611 return (IPPROTO_DONE);
2614 /* If a NULL_REGISTER, pass it to the daemon */
2615 if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
2616 goto pim_input_to_daemon;
2619 * Copy the TOS from the outer IP header to the inner IP header.
2621 if (encap_ip->ip_tos != ip_tos) {
2622 /* Outer TOS -> inner TOS */
2623 encap_ip->ip_tos = ip_tos;
2624 /* Recompute the inner header checksum. Sigh... */
2626 /* adjust mbuf to point to the inner IP header */
2627 m->m_data += (iphlen + PIM_MINLEN);
2628 m->m_len -= (iphlen + PIM_MINLEN);
2630 encap_ip->ip_sum = 0;
2631 encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2);
2633 /* restore mbuf to point back to the outer IP header */
2634 m->m_data -= (iphlen + PIM_MINLEN);
2635 m->m_len += (iphlen + PIM_MINLEN);
2639 * Decapsulate the inner IP packet and loopback to forward it
2640 * as a normal multicast packet. Also, make a copy of the
2641 * outer_iphdr + pimhdr + reghdr + encap_iphdr
2642 * to pass to the daemon later, so it can take the appropriate
2643 * actions (e.g., send back PIM_REGISTER_STOP).
2644 * XXX: here m->m_data points to the outer IP header.
2646 mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_NOWAIT);
2648 CTR1(KTR_IPMF, "%s: m_copym() failed", __func__);
2650 return (IPPROTO_DONE);
2653 /* Keep statistics */
2654 /* XXX: registers_bytes include only the encap. mcast pkt */
2655 PIMSTAT_INC(pims_rcv_registers_msgs);
2656 PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len));
2659 * forward the inner ip packet; point m_data at the inner ip.
2661 m_adj(m, iphlen + PIM_MINLEN);
2664 "%s: forward decap'd REGISTER: src %lx dst %lx vif %d",
2666 (u_long)ntohl(encap_ip->ip_src.s_addr),
2667 (u_long)ntohl(encap_ip->ip_dst.s_addr),
2668 (int)V_reg_vif_num);
2670 /* NB: vifp was collected above; can it change on us? */
2671 if_simloop(vifp, m, dst.sin_family, 0);
2673 /* prepare the register head to send to the mrouting daemon */
2677 pim_input_to_daemon:
2679 * Pass the PIM message up to the daemon; if it is a Register message,
2680 * pass the 'head' only up to the daemon. This includes the
2681 * outer IP header, PIM header, PIM-Register header and the
2683 * XXX: the outer IP header pkt size of a Register is not adjust to
2684 * reflect the fact that the inner multicast data is truncated.
2686 return (rip_input(&m, &off, proto));
2690 sysctl_mfctable(SYSCTL_HANDLER_ARGS)
2697 if (V_mfchashtbl == NULL) /* XXX unlocked */
2699 error = sysctl_wire_old_buffer(req, 0);
2704 for (i = 0; i < mfchashsize; i++) {
2705 LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) {
2706 error = SYSCTL_OUT(req, rt, sizeof(struct mfc));
2716 static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable,
2717 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mfctable,
2718 "IPv4 Multicast Forwarding Table "
2719 "(struct *mfc[mfchashsize], netinet/ip_mroute.h)");
2722 sysctl_viflist(SYSCTL_HANDLER_ARGS)
2728 if (V_viftable == NULL) /* XXX unlocked */
2730 error = sysctl_wire_old_buffer(req, sizeof(*V_viftable) * MAXVIFS);
2735 error = SYSCTL_OUT(req, V_viftable, sizeof(*V_viftable) * MAXVIFS);
2740 SYSCTL_PROC(_net_inet_ip, OID_AUTO, viftable,
2741 CTLTYPE_OPAQUE | CTLFLAG_VNET | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
2742 sysctl_viflist, "S,vif[MAXVIFS]",
2743 "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
2746 vnet_mroute_init(const void *unused __unused)
2749 V_nexpire = malloc(mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO);
2751 V_viftable = mallocarray(MAXVIFS, sizeof(*V_viftable),
2752 M_MRTABLE, M_WAITOK|M_ZERO);
2754 callout_init_rw(&V_expire_upcalls_ch, &mrouter_mtx, 0);
2755 callout_init_rw(&V_bw_upcalls_ch, &mrouter_mtx, 0);
2758 VNET_SYSINIT(vnet_mroute_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_init,
2762 vnet_mroute_uninit(const void *unused __unused)
2765 free(V_viftable, M_MRTABLE);
2766 free(V_nexpire, M_MRTABLE);
2770 VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE,
2771 vnet_mroute_uninit, NULL);
2774 ip_mroute_modevent(module_t mod, int type, void *unused)
2781 if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
2782 if_detached_event, NULL, EVENTHANDLER_PRI_ANY);
2783 if (if_detach_event_tag == NULL) {
2784 printf("ip_mroute: unable to register "
2785 "ifnet_departure_event handler\n");
2790 mfchashsize = MFCHASHSIZE;
2791 if (TUNABLE_ULONG_FETCH("net.inet.ip.mfchashsize", &mfchashsize) &&
2792 !powerof2(mfchashsize)) {
2793 printf("WARNING: %s not a power of 2; using default\n",
2794 "net.inet.ip.mfchashsize");
2795 mfchashsize = MFCHASHSIZE;
2798 pim_squelch_wholepkt = 0;
2799 TUNABLE_ULONG_FETCH("net.inet.pim.squelch_wholepkt",
2800 &pim_squelch_wholepkt);
2802 pim_encap_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
2803 if (pim_encap_cookie == NULL) {
2804 printf("ip_mroute: unable to attach pim encap\n");
2809 ip_mcast_src = X_ip_mcast_src;
2810 ip_mforward = X_ip_mforward;
2811 ip_mrouter_done = X_ip_mrouter_done;
2812 ip_mrouter_get = X_ip_mrouter_get;
2813 ip_mrouter_set = X_ip_mrouter_set;
2815 ip_rsvp_force_done = X_ip_rsvp_force_done;
2816 ip_rsvp_vif = X_ip_rsvp_vif;
2818 legal_vif_num = X_legal_vif_num;
2819 mrt_ioctl = X_mrt_ioctl;
2820 rsvp_input_p = X_rsvp_input;
2825 * Typically module unload happens after the user-level
2826 * process has shutdown the kernel services (the check
2827 * below insures someone can't just yank the module out
2828 * from under a running process). But if the module is
2829 * just loaded and then unloaded w/o starting up a user
2830 * process we still need to cleanup.
2833 if (ip_mrouter_cnt != 0) {
2837 ip_mrouter_unloading = 1;
2840 EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
2842 if (pim_encap_cookie) {
2843 ip_encap_detach(pim_encap_cookie);
2844 pim_encap_cookie = NULL;
2847 ip_mcast_src = NULL;
2849 ip_mrouter_done = NULL;
2850 ip_mrouter_get = NULL;
2851 ip_mrouter_set = NULL;
2853 ip_rsvp_force_done = NULL;
2856 legal_vif_num = NULL;
2858 rsvp_input_p = NULL;
2869 static moduledata_t ip_mroutemod = {
2875 DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE);