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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1989 Stephen Deering
- * Copyright (c) 1992, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Stephen Deering of Stanford University.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /*
- * IP multicast forwarding procedures
- *
- * Written by David Waitzman, BBN Labs, August 1988.
- * Modified by Steve Deering, Stanford, February 1989.
- * Modified by Mark J. Steiglitz, Stanford, May, 1991
- * Modified by Van Jacobson, LBL, January 1993
- * Modified by Ajit Thyagarajan, PARC, August 1993
- * Modified by Bill Fenner, PARC, April 1995
- * Modified by Ahmed Helmy, SGI, June 1996
- * Modified by George Edmond Eddy (Rusty), ISI, February 1998
- * Modified by Pavlin Radoslavov, USC/ISI, May 1998, August 1999, October 2000
- * Modified by Hitoshi Asaeda, WIDE, August 2000
- * Modified by Pavlin Radoslavov, ICSI, October 2002
- * Modified by Wojciech Macek, Semihalf, May 2021
- *
- * MROUTING Revision: 3.5
- * and PIM-SMv2 and PIM-DM support, advanced API support,
- * bandwidth metering and signaling
- */
- /*
- * TODO: Prefix functions with ipmf_.
- * TODO: Maintain a refcount on if_allmulti() in ifnet or in the protocol
- * domain attachment (if_afdata) so we can track consumers of that service.
- * TODO: Deprecate routing socket path for SIOCGETSGCNT and SIOCGETVIFCNT,
- * move it to socket options.
- * TODO: Cleanup LSRR removal further.
- * TODO: Push RSVP stubs into raw_ip.c.
- * TODO: Use bitstring.h for vif set.
- * TODO: Fix mrt6_ioctl dangling ref when dynamically loaded.
- * TODO: Sync ip6_mroute.c with this file.
- */
- #include <sys/cdefs.h>
- #include "opt_inet.h"
- #include "opt_mrouting.h"
- #define _PIM_VT 1
- #include <sys/types.h>
- #include <sys/param.h>
- #include <sys/kernel.h>
- #include <sys/stddef.h>
- #include <sys/condvar.h>
- #include <sys/eventhandler.h>
- #include <sys/lock.h>
- #include <sys/kthread.h>
- #include <sys/ktr.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/module.h>
- #include <sys/priv.h>
- #include <sys/protosw.h>
- #include <sys/signalvar.h>
- #include <sys/socket.h>
- #include <sys/socketvar.h>
- #include <sys/sockio.h>
- #include <sys/sx.h>
- #include <sys/sysctl.h>
- #include <sys/syslog.h>
- #include <sys/systm.h>
- #include <sys/taskqueue.h>
- #include <sys/time.h>
- #include <sys/counter.h>
- #include <machine/atomic.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/if_private.h>
- #include <net/if_types.h>
- #include <net/netisr.h>
- #include <net/route.h>
- #include <net/vnet.h>
- #include <netinet/in.h>
- #include <netinet/igmp.h>
- #include <netinet/in_systm.h>
- #include <netinet/in_var.h>
- #include <netinet/ip.h>
- #include <netinet/ip_encap.h>
- #include <netinet/ip_mroute.h>
- #include <netinet/ip_var.h>
- #include <netinet/ip_options.h>
- #include <netinet/pim.h>
- #include <netinet/pim_var.h>
- #include <netinet/udp.h>
- #include <machine/in_cksum.h>
- #ifndef KTR_IPMF
- #define KTR_IPMF KTR_INET
- #endif
- #define VIFI_INVALID ((vifi_t) -1)
- static MALLOC_DEFINE(M_MRTABLE, "mroutetbl", "multicast forwarding cache");
- /*
- * Locking. We use two locks: one for the virtual interface table and
- * one for the forwarding table. These locks may be nested in which case
- * the VIF lock must always be taken first. Note that each lock is used
- * to cover not only the specific data structure but also related data
- * structures.
- */
- static struct rwlock mrouter_lock;
- #define MRW_RLOCK() rw_rlock(&mrouter_lock)
- #define MRW_WLOCK() rw_wlock(&mrouter_lock)
- #define MRW_RUNLOCK() rw_runlock(&mrouter_lock)
- #define MRW_WUNLOCK() rw_wunlock(&mrouter_lock)
- #define MRW_UNLOCK() rw_unlock(&mrouter_lock)
- #define MRW_LOCK_ASSERT() rw_assert(&mrouter_lock, RA_LOCKED)
- #define MRW_WLOCK_ASSERT() rw_assert(&mrouter_lock, RA_WLOCKED)
- #define MRW_LOCK_TRY_UPGRADE() rw_try_upgrade(&mrouter_lock)
- #define MRW_WOWNED() rw_wowned(&mrouter_lock)
- #define MRW_LOCK_INIT() \
- rw_init(&mrouter_lock, "IPv4 multicast forwarding")
- #define MRW_LOCK_DESTROY() rw_destroy(&mrouter_lock)
- static int ip_mrouter_cnt; /* # of vnets with active mrouters */
- static int ip_mrouter_unloading; /* Allow no more V_ip_mrouter sockets */
- VNET_PCPUSTAT_DEFINE_STATIC(struct mrtstat, mrtstat);
- VNET_PCPUSTAT_SYSINIT(mrtstat);
- VNET_PCPUSTAT_SYSUNINIT(mrtstat);
- SYSCTL_VNET_PCPUSTAT(_net_inet_ip, OID_AUTO, mrtstat, struct mrtstat,
- mrtstat, "IPv4 Multicast Forwarding Statistics (struct mrtstat, "
- "netinet/ip_mroute.h)");
- VNET_DEFINE_STATIC(u_long, mfchash);
- #define V_mfchash VNET(mfchash)
- #define MFCHASH(a, g) \
- ((((a).s_addr >> 20) ^ ((a).s_addr >> 10) ^ (a).s_addr ^ \
- ((g).s_addr >> 20) ^ ((g).s_addr >> 10) ^ (g).s_addr) & V_mfchash)
- #define MFCHASHSIZE 256
- static u_long mfchashsize = MFCHASHSIZE; /* Hash size */
- SYSCTL_ULONG(_net_inet_ip, OID_AUTO, mfchashsize, CTLFLAG_RDTUN,
- &mfchashsize, 0, "IPv4 Multicast Forwarding Table hash size");
- VNET_DEFINE_STATIC(u_char *, nexpire); /* 0..mfchashsize-1 */
- #define V_nexpire VNET(nexpire)
- VNET_DEFINE_STATIC(LIST_HEAD(mfchashhdr, mfc)*, mfchashtbl);
- #define V_mfchashtbl VNET(mfchashtbl)
- VNET_DEFINE_STATIC(struct taskqueue *, task_queue);
- #define V_task_queue VNET(task_queue)
- VNET_DEFINE_STATIC(struct task, task);
- #define V_task VNET(task)
- VNET_DEFINE_STATIC(vifi_t, numvifs);
- #define V_numvifs VNET(numvifs)
- VNET_DEFINE_STATIC(struct vif *, viftable);
- #define V_viftable VNET(viftable)
- static eventhandler_tag if_detach_event_tag = NULL;
- VNET_DEFINE_STATIC(struct callout, expire_upcalls_ch);
- #define V_expire_upcalls_ch VNET(expire_upcalls_ch)
- VNET_DEFINE_STATIC(struct mtx, buf_ring_mtx);
- #define V_buf_ring_mtx VNET(buf_ring_mtx)
- #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
- #define UPCALL_EXPIRE 6 /* number of timeouts */
- /*
- * Bandwidth meter variables and constants
- */
- static MALLOC_DEFINE(M_BWMETER, "bwmeter", "multicast upcall bw meters");
- /*
- * Pending upcalls are stored in a ring which is flushed when
- * full, or periodically
- */
- VNET_DEFINE_STATIC(struct callout, bw_upcalls_ch);
- #define V_bw_upcalls_ch VNET(bw_upcalls_ch)
- VNET_DEFINE_STATIC(struct buf_ring *, bw_upcalls_ring);
- #define V_bw_upcalls_ring VNET(bw_upcalls_ring)
- VNET_DEFINE_STATIC(struct mtx, bw_upcalls_ring_mtx);
- #define V_bw_upcalls_ring_mtx VNET(bw_upcalls_ring_mtx)
- #define BW_UPCALLS_PERIOD (hz) /* periodical flush of bw upcalls */
- VNET_PCPUSTAT_DEFINE_STATIC(struct pimstat, pimstat);
- VNET_PCPUSTAT_SYSINIT(pimstat);
- VNET_PCPUSTAT_SYSUNINIT(pimstat);
- SYSCTL_NODE(_net_inet, IPPROTO_PIM, pim, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "PIM");
- SYSCTL_VNET_PCPUSTAT(_net_inet_pim, PIMCTL_STATS, stats, struct pimstat,
- pimstat, "PIM Statistics (struct pimstat, netinet/pim_var.h)");
- static u_long pim_squelch_wholepkt = 0;
- SYSCTL_ULONG(_net_inet_pim, OID_AUTO, squelch_wholepkt, CTLFLAG_RWTUN,
- &pim_squelch_wholepkt, 0,
- "Disable IGMP_WHOLEPKT notifications if rendezvous point is unspecified");
- static const struct encaptab *pim_encap_cookie;
- static int pim_encapcheck(const struct mbuf *, int, int, void *);
- static int pim_input(struct mbuf *, int, int, void *);
- extern int in_mcast_loop;
- static const struct encap_config ipv4_encap_cfg = {
- .proto = IPPROTO_PIM,
- .min_length = sizeof(struct ip) + PIM_MINLEN,
- .exact_match = 8,
- .check = pim_encapcheck,
- .input = pim_input
- };
- /*
- * Note: the PIM Register encapsulation adds the following in front of a
- * data packet:
- *
- * struct pim_encap_hdr {
- * struct ip ip;
- * struct pim_encap_pimhdr pim;
- * }
- *
- */
- struct pim_encap_pimhdr {
- struct pim pim;
- uint32_t flags;
- };
- #define PIM_ENCAP_TTL 64
- static struct ip pim_encap_iphdr = {
- #if BYTE_ORDER == LITTLE_ENDIAN
- sizeof(struct ip) >> 2,
- IPVERSION,
- #else
- IPVERSION,
- sizeof(struct ip) >> 2,
- #endif
- 0, /* tos */
- sizeof(struct ip), /* total length */
- 0, /* id */
- 0, /* frag offset */
- PIM_ENCAP_TTL,
- IPPROTO_PIM,
- 0, /* checksum */
- };
- static struct pim_encap_pimhdr pim_encap_pimhdr = {
- {
- PIM_MAKE_VT(PIM_VERSION, PIM_REGISTER), /* PIM vers and message type */
- 0, /* reserved */
- 0, /* checksum */
- },
- 0 /* flags */
- };
- VNET_DEFINE_STATIC(vifi_t, reg_vif_num) = VIFI_INVALID;
- #define V_reg_vif_num VNET(reg_vif_num)
- VNET_DEFINE_STATIC(struct ifnet *, multicast_register_if);
- #define V_multicast_register_if VNET(multicast_register_if)
- /*
- * Private variables.
- */
- static u_long X_ip_mcast_src(int);
- static int X_ip_mforward(struct ip *, struct ifnet *, struct mbuf *,
- struct ip_moptions *);
- static int X_ip_mrouter_done(void);
- static int X_ip_mrouter_get(struct socket *, struct sockopt *);
- static int X_ip_mrouter_set(struct socket *, struct sockopt *);
- static int X_legal_vif_num(int);
- static int X_mrt_ioctl(u_long, caddr_t, int);
- static int add_bw_upcall(struct bw_upcall *);
- static int add_mfc(struct mfcctl2 *);
- static int add_vif(struct vifctl *);
- static void bw_meter_prepare_upcall(struct bw_meter *, struct timeval *);
- static void bw_meter_geq_receive_packet(struct bw_meter *, int,
- struct timeval *);
- static void bw_upcalls_send(void);
- static int del_bw_upcall(struct bw_upcall *);
- static int del_mfc(struct mfcctl2 *);
- static int del_vif(vifi_t);
- static int del_vif_locked(vifi_t, struct ifnet **, struct ifnet **);
- static void expire_bw_upcalls_send(void *);
- static void expire_mfc(struct mfc *);
- static void expire_upcalls(void *);
- static void free_bw_list(struct bw_meter *);
- static int get_sg_cnt(struct sioc_sg_req *);
- static int get_vif_cnt(struct sioc_vif_req *);
- static void if_detached_event(void *, struct ifnet *);
- static int ip_mdq(struct mbuf *, struct ifnet *, struct mfc *, vifi_t);
- static int ip_mrouter_init(struct socket *, int);
- static __inline struct mfc *
- mfc_find(struct in_addr *, struct in_addr *);
- static void phyint_send(struct ip *, struct vif *, struct mbuf *);
- static struct mbuf *
- pim_register_prepare(struct ip *, struct mbuf *);
- static int pim_register_send(struct ip *, struct vif *,
- struct mbuf *, struct mfc *);
- static int pim_register_send_rp(struct ip *, struct vif *,
- struct mbuf *, struct mfc *);
- static int pim_register_send_upcall(struct ip *, struct vif *,
- struct mbuf *, struct mfc *);
- static void send_packet(struct vif *, struct mbuf *);
- static int set_api_config(uint32_t *);
- static int set_assert(int);
- static int socket_send(struct socket *, struct mbuf *,
- struct sockaddr_in *);
- /*
- * Kernel multicast forwarding API capabilities and setup.
- * If more API capabilities are added to the kernel, they should be
- * recorded in `mrt_api_support'.
- */
- #define MRT_API_VERSION 0x0305
- static const int mrt_api_version = MRT_API_VERSION;
- static const uint32_t mrt_api_support = (MRT_MFC_FLAGS_DISABLE_WRONGVIF |
- MRT_MFC_FLAGS_BORDER_VIF |
- MRT_MFC_RP |
- MRT_MFC_BW_UPCALL);
- VNET_DEFINE_STATIC(uint32_t, mrt_api_config);
- #define V_mrt_api_config VNET(mrt_api_config)
- VNET_DEFINE_STATIC(int, pim_assert_enabled);
- #define V_pim_assert_enabled VNET(pim_assert_enabled)
- static struct timeval pim_assert_interval = { 3, 0 }; /* Rate limit */
- /*
- * Find a route for a given origin IP address and multicast group address.
- * Statistics must be updated by the caller.
- */
- static __inline struct mfc *
- mfc_find(struct in_addr *o, struct in_addr *g)
- {
- struct mfc *rt;
- /*
- * Might be called both RLOCK and WLOCK.
- * Check if any, it's caller responsibility
- * to choose correct option.
- */
- MRW_LOCK_ASSERT();
- LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(*o, *g)], mfc_hash) {
- if (in_hosteq(rt->mfc_origin, *o) &&
- in_hosteq(rt->mfc_mcastgrp, *g) &&
- buf_ring_empty(rt->mfc_stall_ring))
- break;
- }
- return (rt);
- }
- static __inline struct mfc *
- mfc_alloc(void)
- {
- struct mfc *rt;
- rt = malloc(sizeof(*rt), M_MRTABLE, M_NOWAIT | M_ZERO);
- if (rt == NULL)
- return rt;
- rt->mfc_stall_ring = buf_ring_alloc(MAX_UPQ, M_MRTABLE,
- M_NOWAIT, &V_buf_ring_mtx);
- if (rt->mfc_stall_ring == NULL) {
- free(rt, M_MRTABLE);
- return NULL;
- }
- return rt;
- }
- /*
- * Handle MRT setsockopt commands to modify the multicast forwarding tables.
- */
- static int
- X_ip_mrouter_set(struct socket *so, struct sockopt *sopt)
- {
- int error, optval;
- vifi_t vifi;
- struct vifctl vifc;
- struct mfcctl2 mfc;
- struct bw_upcall bw_upcall;
- uint32_t i;
- if (so != V_ip_mrouter && sopt->sopt_name != MRT_INIT)
- return EPERM;
- error = 0;
- switch (sopt->sopt_name) {
- case MRT_INIT:
- error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
- if (error)
- break;
- error = ip_mrouter_init(so, optval);
- break;
- case MRT_DONE:
- error = ip_mrouter_done();
- break;
- case MRT_ADD_VIF:
- error = sooptcopyin(sopt, &vifc, sizeof vifc, sizeof vifc);
- if (error)
- break;
- error = add_vif(&vifc);
- break;
- case MRT_DEL_VIF:
- error = sooptcopyin(sopt, &vifi, sizeof vifi, sizeof vifi);
- if (error)
- break;
- error = del_vif(vifi);
- break;
- case MRT_ADD_MFC:
- case MRT_DEL_MFC:
- /*
- * select data size depending on API version.
- */
- if (sopt->sopt_name == MRT_ADD_MFC &&
- V_mrt_api_config & MRT_API_FLAGS_ALL) {
- error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl2),
- sizeof(struct mfcctl2));
- } else {
- error = sooptcopyin(sopt, &mfc, sizeof(struct mfcctl),
- sizeof(struct mfcctl));
- bzero((caddr_t)&mfc + sizeof(struct mfcctl),
- sizeof(mfc) - sizeof(struct mfcctl));
- }
- if (error)
- break;
- if (sopt->sopt_name == MRT_ADD_MFC)
- error = add_mfc(&mfc);
- else
- error = del_mfc(&mfc);
- break;
- case MRT_ASSERT:
- error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval);
- if (error)
- break;
- set_assert(optval);
- break;
- case MRT_API_CONFIG:
- error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
- if (!error)
- error = set_api_config(&i);
- if (!error)
- error = sooptcopyout(sopt, &i, sizeof i);
- break;
- case MRT_ADD_BW_UPCALL:
- case MRT_DEL_BW_UPCALL:
- error = sooptcopyin(sopt, &bw_upcall, sizeof bw_upcall,
- sizeof bw_upcall);
- if (error)
- break;
- if (sopt->sopt_name == MRT_ADD_BW_UPCALL)
- error = add_bw_upcall(&bw_upcall);
- else
- error = del_bw_upcall(&bw_upcall);
- break;
- default:
- error = EOPNOTSUPP;
- break;
- }
- return error;
- }
- /*
- * Handle MRT getsockopt commands
- */
- static int
- X_ip_mrouter_get(struct socket *so, struct sockopt *sopt)
- {
- int error;
- switch (sopt->sopt_name) {
- case MRT_VERSION:
- error = sooptcopyout(sopt, &mrt_api_version,
- sizeof mrt_api_version);
- break;
- case MRT_ASSERT:
- error = sooptcopyout(sopt, &V_pim_assert_enabled,
- sizeof V_pim_assert_enabled);
- break;
- case MRT_API_SUPPORT:
- error = sooptcopyout(sopt, &mrt_api_support,
- sizeof mrt_api_support);
- break;
- case MRT_API_CONFIG:
- error = sooptcopyout(sopt, &V_mrt_api_config,
- sizeof V_mrt_api_config);
- break;
- default:
- error = EOPNOTSUPP;
- break;
- }
- return error;
- }
- /*
- * Handle ioctl commands to obtain information from the cache
- */
- static int
- X_mrt_ioctl(u_long cmd, caddr_t data, int fibnum __unused)
- {
- int error;
- /*
- * Currently the only function calling this ioctl routine is rtioctl_fib().
- * Typically, only root can create the raw socket in order to execute
- * this ioctl method, however the request might be coming from a prison
- */
- error = priv_check(curthread, PRIV_NETINET_MROUTE);
- if (error)
- return (error);
- switch (cmd) {
- case (SIOCGETVIFCNT):
- error = get_vif_cnt((struct sioc_vif_req *)data);
- break;
- case (SIOCGETSGCNT):
- error = get_sg_cnt((struct sioc_sg_req *)data);
- break;
- default:
- error = EINVAL;
- break;
- }
- return error;
- }
- /*
- * returns the packet, byte, rpf-failure count for the source group provided
- */
- static int
- get_sg_cnt(struct sioc_sg_req *req)
- {
- struct mfc *rt;
- MRW_RLOCK();
- rt = mfc_find(&req->src, &req->grp);
- if (rt == NULL) {
- MRW_RUNLOCK();
- req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
- return EADDRNOTAVAIL;
- }
- req->pktcnt = rt->mfc_pkt_cnt;
- req->bytecnt = rt->mfc_byte_cnt;
- req->wrong_if = rt->mfc_wrong_if;
- MRW_RUNLOCK();
- return 0;
- }
- /*
- * returns the input and output packet and byte counts on the vif provided
- */
- static int
- get_vif_cnt(struct sioc_vif_req *req)
- {
- vifi_t vifi = req->vifi;
- MRW_RLOCK();
- if (vifi >= V_numvifs) {
- MRW_RUNLOCK();
- return EINVAL;
- }
- mtx_lock_spin(&V_viftable[vifi].v_spin);
- req->icount = V_viftable[vifi].v_pkt_in;
- req->ocount = V_viftable[vifi].v_pkt_out;
- req->ibytes = V_viftable[vifi].v_bytes_in;
- req->obytes = V_viftable[vifi].v_bytes_out;
- mtx_unlock_spin(&V_viftable[vifi].v_spin);
- MRW_RUNLOCK();
- return 0;
- }
- static void
- if_detached_event(void *arg __unused, struct ifnet *ifp)
- {
- vifi_t vifi;
- u_long i, vifi_cnt = 0;
- struct ifnet *free_ptr, *multi_leave;
- MRW_WLOCK();
- if (V_ip_mrouter == NULL) {
- MRW_WUNLOCK();
- return;
- }
- /*
- * Tear down multicast forwarder state associated with this ifnet.
- * 1. Walk the vif list, matching vifs against this ifnet.
- * 2. Walk the multicast forwarding cache (mfc) looking for
- * inner matches with this vif's index.
- * 3. Expire any matching multicast forwarding cache entries.
- * 4. Free vif state. This should disable ALLMULTI on the interface.
- */
- restart:
- for (vifi = 0; vifi < V_numvifs; vifi++) {
- if (V_viftable[vifi].v_ifp != ifp)
- continue;
- for (i = 0; i < mfchashsize; i++) {
- struct mfc *rt, *nrt;
- LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
- if (rt->mfc_parent == vifi) {
- expire_mfc(rt);
- }
- }
- }
- del_vif_locked(vifi, &multi_leave, &free_ptr);
- if (free_ptr != NULL)
- vifi_cnt++;
- if (multi_leave) {
- MRW_WUNLOCK();
- if_allmulti(multi_leave, 0);
- MRW_WLOCK();
- goto restart;
- }
- }
- MRW_WUNLOCK();
- /*
- * Free IFP. We don't have to use free_ptr here as it is the same
- * that ifp. Perform free as many times as required in case
- * refcount is greater than 1.
- */
- for (i = 0; i < vifi_cnt; i++)
- if_free(ifp);
- }
- static void
- ip_mrouter_upcall_thread(void *arg, int pending __unused)
- {
- CURVNET_SET((struct vnet *) arg);
- MRW_WLOCK();
- bw_upcalls_send();
- MRW_WUNLOCK();
- CURVNET_RESTORE();
- }
- /*
- * Enable multicast forwarding.
- */
- static int
- ip_mrouter_init(struct socket *so, int version)
- {
- CTR2(KTR_IPMF, "%s: so %p", __func__, so);
- if (version != 1)
- return ENOPROTOOPT;
- MRW_WLOCK();
- if (ip_mrouter_unloading) {
- MRW_WUNLOCK();
- return ENOPROTOOPT;
- }
- if (V_ip_mrouter != NULL) {
- MRW_WUNLOCK();
- return EADDRINUSE;
- }
- V_mfchashtbl = hashinit_flags(mfchashsize, M_MRTABLE, &V_mfchash,
- HASH_NOWAIT);
- if (V_mfchashtbl == NULL) {
- MRW_WUNLOCK();
- return (ENOMEM);
- }
- /* Create upcall ring */
- mtx_init(&V_bw_upcalls_ring_mtx, "mroute upcall buf_ring mtx", NULL, MTX_DEF);
- V_bw_upcalls_ring = buf_ring_alloc(BW_UPCALLS_MAX, M_MRTABLE,
- M_NOWAIT, &V_bw_upcalls_ring_mtx);
- if (!V_bw_upcalls_ring) {
- MRW_WUNLOCK();
- return (ENOMEM);
- }
- TASK_INIT(&V_task, 0, ip_mrouter_upcall_thread, curvnet);
- taskqueue_cancel(V_task_queue, &V_task, NULL);
- taskqueue_unblock(V_task_queue);
- callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
- curvnet);
- callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
- curvnet);
- V_ip_mrouter = so;
- atomic_add_int(&ip_mrouter_cnt, 1);
- /* This is a mutex required by buf_ring init, but not used internally */
- mtx_init(&V_buf_ring_mtx, "mroute buf_ring mtx", NULL, MTX_DEF);
- MRW_WUNLOCK();
- CTR1(KTR_IPMF, "%s: done", __func__);
- return 0;
- }
- /*
- * Disable multicast forwarding.
- */
- static int
- X_ip_mrouter_done(void)
- {
- struct ifnet **ifps;
- int nifp;
- u_long i;
- vifi_t vifi;
- struct bw_upcall *bu;
- if (V_ip_mrouter == NULL)
- return (EINVAL);
- /*
- * Detach/disable hooks to the reset of the system.
- */
- V_ip_mrouter = NULL;
- atomic_subtract_int(&ip_mrouter_cnt, 1);
- V_mrt_api_config = 0;
- /*
- * Wait for all epoch sections to complete to ensure
- * V_ip_mrouter = NULL is visible to others.
- */
- NET_EPOCH_WAIT();
- /* Stop and drain task queue */
- taskqueue_block(V_task_queue);
- while (taskqueue_cancel(V_task_queue, &V_task, NULL)) {
- taskqueue_drain(V_task_queue, &V_task);
- }
- ifps = malloc(MAXVIFS * sizeof(*ifps), M_TEMP, M_WAITOK);
- MRW_WLOCK();
- taskqueue_cancel(V_task_queue, &V_task, NULL);
- /* Destroy upcall ring */
- while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
- free(bu, M_MRTABLE);
- }
- buf_ring_free(V_bw_upcalls_ring, M_MRTABLE);
- mtx_destroy(&V_bw_upcalls_ring_mtx);
- /*
- * For each phyint in use, prepare to disable promiscuous reception
- * of all IP multicasts. Defer the actual call until the lock is released;
- * just record the list of interfaces while locked. Some interfaces use
- * sx locks in their ioctl routines, which is not allowed while holding
- * a non-sleepable lock.
- */
- KASSERT(V_numvifs <= MAXVIFS, ("More vifs than possible"));
- for (vifi = 0, nifp = 0; vifi < V_numvifs; vifi++) {
- if (!in_nullhost(V_viftable[vifi].v_lcl_addr) &&
- !(V_viftable[vifi].v_flags & (VIFF_TUNNEL | VIFF_REGISTER))) {
- ifps[nifp++] = V_viftable[vifi].v_ifp;
- }
- }
- bzero((caddr_t)V_viftable, sizeof(*V_viftable) * MAXVIFS);
- V_numvifs = 0;
- V_pim_assert_enabled = 0;
- callout_stop(&V_expire_upcalls_ch);
- callout_stop(&V_bw_upcalls_ch);
- /*
- * Free all multicast forwarding cache entries.
- * Do not use hashdestroy(), as we must perform other cleanup.
- */
- for (i = 0; i < mfchashsize; i++) {
- struct mfc *rt, *nrt;
- LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
- expire_mfc(rt);
- }
- }
- free(V_mfchashtbl, M_MRTABLE);
- V_mfchashtbl = NULL;
- bzero(V_nexpire, sizeof(V_nexpire[0]) * mfchashsize);
- V_reg_vif_num = VIFI_INVALID;
- mtx_destroy(&V_buf_ring_mtx);
- MRW_WUNLOCK();
- /*
- * Now drop our claim on promiscuous multicast on the interfaces recorded
- * above. This is safe to do now because ALLMULTI is reference counted.
- */
- for (vifi = 0; vifi < nifp; vifi++)
- if_allmulti(ifps[vifi], 0);
- free(ifps, M_TEMP);
- CTR1(KTR_IPMF, "%s: done", __func__);
- return 0;
- }
- /*
- * Set PIM assert processing global
- */
- static int
- set_assert(int i)
- {
- if ((i != 1) && (i != 0))
- return EINVAL;
- V_pim_assert_enabled = i;
- return 0;
- }
- /*
- * Configure API capabilities
- */
- int
- set_api_config(uint32_t *apival)
- {
- u_long i;
- /*
- * We can set the API capabilities only if it is the first operation
- * after MRT_INIT. I.e.:
- * - there are no vifs installed
- * - pim_assert is not enabled
- * - the MFC table is empty
- */
- if (V_numvifs > 0) {
- *apival = 0;
- return EPERM;
- }
- if (V_pim_assert_enabled) {
- *apival = 0;
- return EPERM;
- }
- MRW_RLOCK();
- for (i = 0; i < mfchashsize; i++) {
- if (LIST_FIRST(&V_mfchashtbl[i]) != NULL) {
- MRW_RUNLOCK();
- *apival = 0;
- return EPERM;
- }
- }
- MRW_RUNLOCK();
- V_mrt_api_config = *apival & mrt_api_support;
- *apival = V_mrt_api_config;
- return 0;
- }
- /*
- * Add a vif to the vif table
- */
- static int
- add_vif(struct vifctl *vifcp)
- {
- struct vif *vifp = V_viftable + vifcp->vifc_vifi;
- struct sockaddr_in sin = {sizeof sin, AF_INET};
- struct ifaddr *ifa;
- struct ifnet *ifp;
- int error;
- if (vifcp->vifc_vifi >= MAXVIFS)
- return EINVAL;
- /* rate limiting is no longer supported by this code */
- if (vifcp->vifc_rate_limit != 0) {
- log(LOG_ERR, "rate limiting is no longer supported\n");
- return EINVAL;
- }
- if (in_nullhost(vifcp->vifc_lcl_addr))
- return EADDRNOTAVAIL;
- /* Find the interface with an address in AF_INET family */
- if (vifcp->vifc_flags & VIFF_REGISTER) {
- /*
- * XXX: Because VIFF_REGISTER does not really need a valid
- * local interface (e.g. it could be 127.0.0.2), we don't
- * check its address.
- */
- ifp = NULL;
- } else {
- struct epoch_tracker et;
- sin.sin_addr = vifcp->vifc_lcl_addr;
- NET_EPOCH_ENTER(et);
- ifa = ifa_ifwithaddr((struct sockaddr *)&sin);
- if (ifa == NULL) {
- NET_EPOCH_EXIT(et);
- return EADDRNOTAVAIL;
- }
- ifp = ifa->ifa_ifp;
- /* XXX FIXME we need to take a ref on ifp and cleanup properly! */
- NET_EPOCH_EXIT(et);
- }
- if ((vifcp->vifc_flags & VIFF_TUNNEL) != 0) {
- CTR1(KTR_IPMF, "%s: tunnels are no longer supported", __func__);
- return EOPNOTSUPP;
- } else if (vifcp->vifc_flags & VIFF_REGISTER) {
- ifp = V_multicast_register_if = if_alloc(IFT_LOOP);
- CTR2(KTR_IPMF, "%s: add register vif for ifp %p", __func__, ifp);
- if (V_reg_vif_num == VIFI_INVALID) {
- if_initname(V_multicast_register_if, "register_vif", 0);
- V_reg_vif_num = vifcp->vifc_vifi;
- }
- } else { /* Make sure the interface supports multicast */
- if ((ifp->if_flags & IFF_MULTICAST) == 0)
- return EOPNOTSUPP;
- /* Enable promiscuous reception of all IP multicasts from the if */
- error = if_allmulti(ifp, 1);
- if (error)
- return error;
- }
- MRW_WLOCK();
- if (!in_nullhost(vifp->v_lcl_addr)) {
- if (ifp)
- V_multicast_register_if = NULL;
- MRW_WUNLOCK();
- if (ifp)
- if_free(ifp);
- return EADDRINUSE;
- }
- vifp->v_flags = vifcp->vifc_flags;
- vifp->v_threshold = vifcp->vifc_threshold;
- vifp->v_lcl_addr = vifcp->vifc_lcl_addr;
- vifp->v_rmt_addr = vifcp->vifc_rmt_addr;
- vifp->v_ifp = ifp;
- /* initialize per vif pkt counters */
- vifp->v_pkt_in = 0;
- vifp->v_pkt_out = 0;
- vifp->v_bytes_in = 0;
- vifp->v_bytes_out = 0;
- sprintf(vifp->v_spin_name, "BM[%d] spin", vifcp->vifc_vifi);
- mtx_init(&vifp->v_spin, vifp->v_spin_name, NULL, MTX_SPIN);
- /* Adjust numvifs up if the vifi is higher than numvifs */
- if (V_numvifs <= vifcp->vifc_vifi)
- V_numvifs = vifcp->vifc_vifi + 1;
- MRW_WUNLOCK();
- CTR4(KTR_IPMF, "%s: add vif %d laddr 0x%08x thresh %x", __func__,
- (int)vifcp->vifc_vifi, ntohl(vifcp->vifc_lcl_addr.s_addr),
- (int)vifcp->vifc_threshold);
- return 0;
- }
- /*
- * Delete a vif from the vif table
- */
- static int
- del_vif_locked(vifi_t vifi, struct ifnet **ifp_multi_leave, struct ifnet **ifp_free)
- {
- struct vif *vifp;
- *ifp_free = NULL;
- *ifp_multi_leave = NULL;
- MRW_WLOCK_ASSERT();
- if (vifi >= V_numvifs) {
- return EINVAL;
- }
- vifp = &V_viftable[vifi];
- if (in_nullhost(vifp->v_lcl_addr)) {
- return EADDRNOTAVAIL;
- }
- if (!(vifp->v_flags & (VIFF_TUNNEL | VIFF_REGISTER)))
- *ifp_multi_leave = vifp->v_ifp;
- if (vifp->v_flags & VIFF_REGISTER) {
- V_reg_vif_num = VIFI_INVALID;
- if (vifp->v_ifp) {
- if (vifp->v_ifp == V_multicast_register_if)
- V_multicast_register_if = NULL;
- *ifp_free = vifp->v_ifp;
- }
- }
- mtx_destroy(&vifp->v_spin);
- bzero((caddr_t)vifp, sizeof (*vifp));
- CTR2(KTR_IPMF, "%s: delete vif %d", __func__, (int)vifi);
- /* Adjust numvifs down */
- for (vifi = V_numvifs; vifi > 0; vifi--)
- if (!in_nullhost(V_viftable[vifi-1].v_lcl_addr))
- break;
- V_numvifs = vifi;
- return 0;
- }
- static int
- del_vif(vifi_t vifi)
- {
- int cc;
- struct ifnet *free_ptr, *multi_leave;
- MRW_WLOCK();
- cc = del_vif_locked(vifi, &multi_leave, &free_ptr);
- MRW_WUNLOCK();
- if (multi_leave)
- if_allmulti(multi_leave, 0);
- if (free_ptr) {
- if_free(free_ptr);
- }
- return cc;
- }
- /*
- * update an mfc entry without resetting counters and S,G addresses.
- */
- static void
- update_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
- {
- int i;
- rt->mfc_parent = mfccp->mfcc_parent;
- for (i = 0; i < V_numvifs; i++) {
- rt->mfc_ttls[i] = mfccp->mfcc_ttls[i];
- rt->mfc_flags[i] = mfccp->mfcc_flags[i] & V_mrt_api_config &
- MRT_MFC_FLAGS_ALL;
- }
- /* set the RP address */
- if (V_mrt_api_config & MRT_MFC_RP)
- rt->mfc_rp = mfccp->mfcc_rp;
- else
- rt->mfc_rp.s_addr = INADDR_ANY;
- }
- /*
- * fully initialize an mfc entry from the parameter.
- */
- static void
- init_mfc_params(struct mfc *rt, struct mfcctl2 *mfccp)
- {
- rt->mfc_origin = mfccp->mfcc_origin;
- rt->mfc_mcastgrp = mfccp->mfcc_mcastgrp;
- update_mfc_params(rt, mfccp);
- /* initialize pkt counters per src-grp */
- rt->mfc_pkt_cnt = 0;
- rt->mfc_byte_cnt = 0;
- rt->mfc_wrong_if = 0;
- timevalclear(&rt->mfc_last_assert);
- }
- static void
- expire_mfc(struct mfc *rt)
- {
- struct rtdetq *rte;
- MRW_WLOCK_ASSERT();
- free_bw_list(rt->mfc_bw_meter_leq);
- free_bw_list(rt->mfc_bw_meter_geq);
- while (!buf_ring_empty(rt->mfc_stall_ring)) {
- rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
- if (rte) {
- m_freem(rte->m);
- free(rte, M_MRTABLE);
- }
- }
- buf_ring_free(rt->mfc_stall_ring, M_MRTABLE);
- LIST_REMOVE(rt, mfc_hash);
- free(rt, M_MRTABLE);
- }
- /*
- * Add an mfc entry
- */
- static int
- add_mfc(struct mfcctl2 *mfccp)
- {
- struct mfc *rt;
- struct rtdetq *rte;
- u_long hash = 0;
- u_short nstl;
- struct epoch_tracker et;
- MRW_WLOCK();
- rt = mfc_find(&mfccp->mfcc_origin, &mfccp->mfcc_mcastgrp);
- /* If an entry already exists, just update the fields */
- if (rt) {
- CTR4(KTR_IPMF, "%s: update mfc orig 0x%08x group %lx parent %x",
- __func__, ntohl(mfccp->mfcc_origin.s_addr),
- (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
- mfccp->mfcc_parent);
- update_mfc_params(rt, mfccp);
- MRW_WUNLOCK();
- return (0);
- }
- /*
- * Find the entry for which the upcall was made and update
- */
- nstl = 0;
- hash = MFCHASH(mfccp->mfcc_origin, mfccp->mfcc_mcastgrp);
- NET_EPOCH_ENTER(et);
- LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
- if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
- in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp) &&
- !buf_ring_empty(rt->mfc_stall_ring)) {
- CTR5(KTR_IPMF,
- "%s: add mfc orig 0x%08x group %lx parent %x qh %p",
- __func__, ntohl(mfccp->mfcc_origin.s_addr),
- (u_long)ntohl(mfccp->mfcc_mcastgrp.s_addr),
- mfccp->mfcc_parent,
- rt->mfc_stall_ring);
- if (nstl++)
- CTR1(KTR_IPMF, "%s: multiple matches", __func__);
- init_mfc_params(rt, mfccp);
- rt->mfc_expire = 0; /* Don't clean this guy up */
- V_nexpire[hash]--;
- /* Free queued packets, but attempt to forward them first. */
- while (!buf_ring_empty(rt->mfc_stall_ring)) {
- rte = buf_ring_dequeue_mc(rt->mfc_stall_ring);
- if (rte->ifp != NULL)
- ip_mdq(rte->m, rte->ifp, rt, -1);
- m_freem(rte->m);
- free(rte, M_MRTABLE);
- }
- }
- }
- NET_EPOCH_EXIT(et);
- /*
- * It is possible that an entry is being inserted without an upcall
- */
- if (nstl == 0) {
- CTR1(KTR_IPMF, "%s: adding mfc w/o upcall", __func__);
- LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash) {
- if (in_hosteq(rt->mfc_origin, mfccp->mfcc_origin) &&
- in_hosteq(rt->mfc_mcastgrp, mfccp->mfcc_mcastgrp)) {
- init_mfc_params(rt, mfccp);
- if (rt->mfc_expire)
- V_nexpire[hash]--;
- rt->mfc_expire = 0;
- break; /* XXX */
- }
- }
- if (rt == NULL) { /* no upcall, so make a new entry */
- rt = mfc_alloc();
- if (rt == NULL) {
- MRW_WUNLOCK();
- return (ENOBUFS);
- }
- init_mfc_params(rt, mfccp);
- rt->mfc_expire = 0;
- rt->mfc_bw_meter_leq = NULL;
- rt->mfc_bw_meter_geq = NULL;
- /* insert new entry at head of hash chain */
- LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
- }
- }
- MRW_WUNLOCK();
- return (0);
- }
- /*
- * Delete an mfc entry
- */
- static int
- del_mfc(struct mfcctl2 *mfccp)
- {
- struct in_addr origin;
- struct in_addr mcastgrp;
- struct mfc *rt;
- origin = mfccp->mfcc_origin;
- mcastgrp = mfccp->mfcc_mcastgrp;
- CTR3(KTR_IPMF, "%s: delete mfc orig 0x%08x group %lx", __func__,
- ntohl(origin.s_addr), (u_long)ntohl(mcastgrp.s_addr));
- MRW_WLOCK();
- LIST_FOREACH(rt, &V_mfchashtbl[MFCHASH(origin, mcastgrp)], mfc_hash) {
- if (in_hosteq(rt->mfc_origin, origin) &&
- in_hosteq(rt->mfc_mcastgrp, mcastgrp))
- break;
- }
- if (rt == NULL) {
- MRW_WUNLOCK();
- return EADDRNOTAVAIL;
- }
- expire_mfc(rt);
- MRW_WUNLOCK();
- return (0);
- }
- /*
- * Send a message to the routing daemon on the multicast routing socket.
- */
- static int
- socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in *src)
- {
- if (s) {
- SOCKBUF_LOCK(&s->so_rcv);
- if (sbappendaddr_locked(&s->so_rcv, (struct sockaddr *)src, mm,
- NULL) != 0) {
- sorwakeup_locked(s);
- return 0;
- }
- soroverflow_locked(s);
- }
- m_freem(mm);
- return -1;
- }
- /*
- * IP multicast forwarding function. This function assumes that the packet
- * pointed to by "ip" has arrived on (or is about to be sent to) the interface
- * pointed to by "ifp", and the packet is to be relayed to other networks
- * that have members of the packet's destination IP multicast group.
- *
- * The packet is returned unscathed to the caller, unless it is
- * erroneous, in which case a non-zero return value tells the caller to
- * discard it.
- */
- #define TUNNEL_LEN 12 /* # bytes of IP option for tunnel encapsulation */
- static int
- X_ip_mforward(struct ip *ip, struct ifnet *ifp, struct mbuf *m,
- struct ip_moptions *imo)
- {
- struct mfc *rt;
- int error;
- vifi_t vifi;
- struct mbuf *mb0;
- struct rtdetq *rte;
- u_long hash;
- int hlen;
- CTR3(KTR_IPMF, "ip_mforward: delete mfc orig 0x%08x group %lx ifp %p",
- ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr), ifp);
- if (ip->ip_hl < (sizeof(struct ip) + TUNNEL_LEN) >> 2 ||
- ((u_char *)(ip + 1))[1] != IPOPT_LSRR) {
- /*
- * Packet arrived via a physical interface or
- * an encapsulated tunnel or a register_vif.
- */
- } else {
- /*
- * Packet arrived through a source-route tunnel.
- * Source-route tunnels are no longer supported.
- */
- return (1);
- }
- /*
- * BEGIN: MCAST ROUTING HOT PATH
- */
- MRW_RLOCK();
- if (imo && ((vifi = imo->imo_multicast_vif) < V_numvifs)) {
- if (ip->ip_ttl < MAXTTL)
- ip->ip_ttl++; /* compensate for -1 in *_send routines */
- error = ip_mdq(m, ifp, NULL, vifi);
- MRW_RUNLOCK();
- return error;
- }
- /*
- * Don't forward a packet with time-to-live of zero or one,
- * or a packet destined to a local-only group.
- */
- if (ip->ip_ttl <= 1 || IN_LOCAL_GROUP(ntohl(ip->ip_dst.s_addr))) {
- MRW_RUNLOCK();
- return 0;
- }
- mfc_find_retry:
- /*
- * Determine forwarding vifs from the forwarding cache table
- */
- MRTSTAT_INC(mrts_mfc_lookups);
- rt = mfc_find(&ip->ip_src, &ip->ip_dst);
- /* Entry exists, so forward if necessary */
- if (rt != NULL) {
- error = ip_mdq(m, ifp, rt, -1);
- /* Generic unlock here as we might release R or W lock */
- MRW_UNLOCK();
- return error;
- }
- /*
- * END: MCAST ROUTING HOT PATH
- */
- /* Further processing must be done with WLOCK taken */
- if ((MRW_WOWNED() == 0) && (MRW_LOCK_TRY_UPGRADE() == 0)) {
- MRW_RUNLOCK();
- MRW_WLOCK();
- goto mfc_find_retry;
- }
- /*
- * If we don't have a route for packet's origin,
- * Make a copy of the packet & send message to routing daemon
- */
- hlen = ip->ip_hl << 2;
- MRTSTAT_INC(mrts_mfc_misses);
- MRTSTAT_INC(mrts_no_route);
- CTR2(KTR_IPMF, "ip_mforward: no mfc for (0x%08x,%lx)",
- ntohl(ip->ip_src.s_addr), (u_long)ntohl(ip->ip_dst.s_addr));
- /*
- * Allocate mbufs early so that we don't do extra work if we are
- * just going to fail anyway. Make sure to pullup the header so
- * that other people can't step on it.
- */
- rte = malloc((sizeof *rte), M_MRTABLE, M_NOWAIT|M_ZERO);
- if (rte == NULL) {
- MRW_WUNLOCK();
- return ENOBUFS;
- }
- mb0 = m_copypacket(m, M_NOWAIT);
- if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < hlen))
- mb0 = m_pullup(mb0, hlen);
- if (mb0 == NULL) {
- free(rte, M_MRTABLE);
- MRW_WUNLOCK();
- return ENOBUFS;
- }
- /* is there an upcall waiting for this flow ? */
- hash = MFCHASH(ip->ip_src, ip->ip_dst);
- LIST_FOREACH(rt, &V_mfchashtbl[hash], mfc_hash)
- {
- if (in_hosteq(ip->ip_src, rt->mfc_origin) &&
- in_hosteq(ip->ip_dst, rt->mfc_mcastgrp) &&
- !buf_ring_empty(rt->mfc_stall_ring))
- break;
- }
- if (rt == NULL) {
- int i;
- struct igmpmsg *im;
- struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
- struct mbuf *mm;
- /*
- * Locate the vifi for the incoming interface for this packet.
- * If none found, drop packet.
- */
- for (vifi = 0; vifi < V_numvifs &&
- V_viftable[vifi].v_ifp != ifp; vifi++)
- ;
- if (vifi >= V_numvifs) /* vif not found, drop packet */
- goto non_fatal;
- /* no upcall, so make a new entry */
- rt = mfc_alloc();
- if (rt == NULL)
- goto fail;
- /* Make a copy of the header to send to the user level process */
- mm = m_copym(mb0, 0, hlen, M_NOWAIT);
- if (mm == NULL)
- goto fail1;
- /*
- * Send message to routing daemon to install
- * a route into the kernel table
- */
- im = mtod(mm, struct igmpmsg*);
- im->im_msgtype = IGMPMSG_NOCACHE;
- im->im_mbz = 0;
- im->im_vif = vifi;
- MRTSTAT_INC(mrts_upcalls);
- k_igmpsrc.sin_addr = ip->ip_src;
- if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
- CTR0(KTR_IPMF, "ip_mforward: socket queue full");
- MRTSTAT_INC(mrts_upq_sockfull);
- fail1: free(rt, M_MRTABLE);
- fail: free(rte, M_MRTABLE);
- m_freem(mb0);
- MRW_WUNLOCK();
- return ENOBUFS;
- }
- /* insert new entry at head of hash chain */
- rt->mfc_origin.s_addr = ip->ip_src.s_addr;
- rt->mfc_mcastgrp.s_addr = ip->ip_dst.s_addr;
- rt->mfc_expire = UPCALL_EXPIRE;
- V_nexpire[hash]++;
- for (i = 0; i < V_numvifs; i++) {
- rt->mfc_ttls[i] = 0;
- rt->mfc_flags[i] = 0;
- }
- rt->mfc_parent = -1;
- /* clear the RP address */
- rt->mfc_rp.s_addr = INADDR_ANY;
- rt->mfc_bw_meter_leq = NULL;
- rt->mfc_bw_meter_geq = NULL;
- /* initialize pkt counters per src-grp */
- rt->mfc_pkt_cnt = 0;
- rt->mfc_byte_cnt = 0;
- rt->mfc_wrong_if = 0;
- timevalclear(&rt->mfc_last_assert);
- buf_ring_enqueue(rt->mfc_stall_ring, rte);
- /* Add RT to hashtable as it didn't exist before */
- LIST_INSERT_HEAD(&V_mfchashtbl[hash], rt, mfc_hash);
- } else {
- /* determine if queue has overflowed */
- if (buf_ring_full(rt->mfc_stall_ring)) {
- MRTSTAT_INC(mrts_upq_ovflw);
- non_fatal: free(rte, M_MRTABLE);
- m_freem(mb0);
- MRW_WUNLOCK();
- return (0);
- }
- buf_ring_enqueue(rt->mfc_stall_ring, rte);
- }
- rte->m = mb0;
- rte->ifp = ifp;
- MRW_WUNLOCK();
- return 0;
- }
- /*
- * Clean up the cache entry if upcall is not serviced
- */
- static void
- expire_upcalls(void *arg)
- {
- u_long i;
- CURVNET_SET((struct vnet *) arg);
- /*This callout is always run with MRW_WLOCK taken. */
- for (i = 0; i < mfchashsize; i++) {
- struct mfc *rt, *nrt;
- if (V_nexpire[i] == 0)
- continue;
- LIST_FOREACH_SAFE(rt, &V_mfchashtbl[i], mfc_hash, nrt) {
- if (buf_ring_empty(rt->mfc_stall_ring))
- continue;
- if (rt->mfc_expire == 0 || --rt->mfc_expire > 0)
- continue;
- MRTSTAT_INC(mrts_cache_cleanups);
- CTR3(KTR_IPMF, "%s: expire (%lx, %lx)", __func__,
- (u_long)ntohl(rt->mfc_origin.s_addr),
- (u_long)ntohl(rt->mfc_mcastgrp.s_addr));
- expire_mfc(rt);
- }
- }
- callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls,
- curvnet);
- CURVNET_RESTORE();
- }
- /*
- * Packet forwarding routine once entry in the cache is made
- */
- static int
- ip_mdq(struct mbuf *m, struct ifnet *ifp, struct mfc *rt, vifi_t xmt_vif)
- {
- struct ip *ip = mtod(m, struct ip *);
- vifi_t vifi;
- int plen = ntohs(ip->ip_len);
- MRW_LOCK_ASSERT();
- NET_EPOCH_ASSERT();
- /*
- * If xmt_vif is not -1, send on only the requested vif.
- *
- * (since vifi_t is u_short, -1 becomes MAXUSHORT, which > numvifs.)
- */
- if (xmt_vif < V_numvifs) {
- if (V_viftable[xmt_vif].v_flags & VIFF_REGISTER)
- pim_register_send(ip, V_viftable + xmt_vif, m, rt);
- else
- phyint_send(ip, V_viftable + xmt_vif, m);
- return 1;
- }
- /*
- * Don't forward if it didn't arrive from the parent vif for its origin.
- */
- vifi = rt->mfc_parent;
- if ((vifi >= V_numvifs) || (V_viftable[vifi].v_ifp != ifp)) {
- CTR4(KTR_IPMF, "%s: rx on wrong ifp %p (vifi %d, v_ifp %p)",
- __func__, ifp, (int)vifi, V_viftable[vifi].v_ifp);
- MRTSTAT_INC(mrts_wrong_if);
- ++rt->mfc_wrong_if;
- /*
- * If we are doing PIM assert processing, send a message
- * to the routing daemon.
- *
- * XXX: A PIM-SM router needs the WRONGVIF detection so it
- * can complete the SPT switch, regardless of the type
- * of the iif (broadcast media, GRE tunnel, etc).
- */
- if (V_pim_assert_enabled && (vifi < V_numvifs) &&
- V_viftable[vifi].v_ifp) {
- if (ifp == V_multicast_register_if)
- PIMSTAT_INC(pims_rcv_registers_wrongiif);
- /* Get vifi for the incoming packet */
- for (vifi = 0; vifi < V_numvifs && V_viftable[vifi].v_ifp != ifp; vifi++)
- ;
- if (vifi >= V_numvifs)
- return 0; /* The iif is not found: ignore the packet. */
- if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_DISABLE_WRONGVIF)
- return 0; /* WRONGVIF disabled: ignore the packet */
- if (ratecheck(&rt->mfc_last_assert, &pim_assert_interval)) {
- struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
- struct igmpmsg *im;
- int hlen = ip->ip_hl << 2;
- struct mbuf *mm = m_copym(m, 0, hlen, M_NOWAIT);
- if (mm && (!M_WRITABLE(mm) || mm->m_len < hlen))
- mm = m_pullup(mm, hlen);
- if (mm == NULL)
- return ENOBUFS;
- im = mtod(mm, struct igmpmsg *);
- im->im_msgtype = IGMPMSG_WRONGVIF;
- im->im_mbz = 0;
- im->im_vif = vifi;
- MRTSTAT_INC(mrts_upcalls);
- k_igmpsrc.sin_addr = im->im_src;
- if (socket_send(V_ip_mrouter, mm, &k_igmpsrc) < 0) {
- CTR1(KTR_IPMF, "%s: socket queue full", __func__);
- MRTSTAT_INC(mrts_upq_sockfull);
- return ENOBUFS;
- }
- }
- }
- return 0;
- }
- /* If I sourced this packet, it counts as output, else it was input. */
- mtx_lock_spin(&V_viftable[vifi].v_spin);
- if (in_hosteq(ip->ip_src, V_viftable[vifi].v_lcl_addr)) {
- V_viftable[vifi].v_pkt_out++;
- V_viftable[vifi].v_bytes_out += plen;
- } else {
- V_viftable[vifi].v_pkt_in++;
- V_viftable[vifi].v_bytes_in += plen;
- }
- mtx_unlock_spin(&V_viftable[vifi].v_spin);
- rt->mfc_pkt_cnt++;
- rt->mfc_byte_cnt += plen;
- /*
- * For each vif, decide if a copy of the packet should be forwarded.
- * Forward if:
- * - the ttl exceeds the vif's threshold
- * - there are group members downstream on interface
- */
- for (vifi = 0; vifi < V_numvifs; vifi++)
- if ((rt->mfc_ttls[vifi] > 0) && (ip->ip_ttl > rt->mfc_ttls[vifi])) {
- V_viftable[vifi].v_pkt_out++;
- V_viftable[vifi].v_bytes_out += plen;
- if (V_viftable[vifi].v_flags & VIFF_REGISTER)
- pim_register_send(ip, V_viftable + vifi, m, rt);
- else
- phyint_send(ip, V_viftable + vifi, m);
- }
- /*
- * Perform upcall-related bw measuring.
- */
- if ((rt->mfc_bw_meter_geq != NULL) || (rt->mfc_bw_meter_leq != NULL)) {
- struct bw_meter *x;
- struct timeval now;
- microtime(&now);
- /* Process meters for Greater-or-EQual case */
- for (x = rt->mfc_bw_meter_geq; x != NULL; x = x->bm_mfc_next)
- bw_meter_geq_receive_packet(x, plen, &now);
- /* Process meters for Lower-or-EQual case */
- for (x = rt->mfc_bw_meter_leq; x != NULL; x = x->bm_mfc_next) {
- /*
- * Record that a packet is received.
- * Spin lock has to be taken as callout context
- * (expire_bw_meter_leq) might modify these fields
- * as well
- */
- mtx_lock_spin(&x->bm_spin);
- x->bm_measured.b_packets++;
- x->bm_measured.b_bytes += plen;
- mtx_unlock_spin(&x->bm_spin);
- }
- }
- return 0;
- }
- /*
- * Check if a vif number is legal/ok. This is used by in_mcast.c.
- */
- static int
- X_legal_vif_num(int vif)
- {
- int ret;
- ret = 0;
- if (vif < 0)
- return (ret);
- MRW_RLOCK();
- if (vif < V_numvifs)
- ret = 1;
- MRW_RUNLOCK();
- return (ret);
- }
- /*
- * Return the local address used by this vif
- */
- static u_long
- X_ip_mcast_src(int vifi)
- {
- in_addr_t addr;
- addr = INADDR_ANY;
- if (vifi < 0)
- return (addr);
- MRW_RLOCK();
- if (vifi < V_numvifs)
- addr = V_viftable[vifi].v_lcl_addr.s_addr;
- MRW_RUNLOCK();
- return (addr);
- }
- static void
- phyint_send(struct ip *ip, struct vif *vifp, struct mbuf *m)
- {
- struct mbuf *mb_copy;
- int hlen = ip->ip_hl << 2;
- MRW_LOCK_ASSERT();
- /*
- * Make a new reference to the packet; make sure that
- * the IP header is actually copied, not just referenced,
- * so that ip_output() only scribbles on the copy.
- */
- mb_copy = m_copypacket(m, M_NOWAIT);
- if (mb_copy && (!M_WRITABLE(mb_copy) || mb_copy->m_len < hlen))
- mb_copy = m_pullup(mb_copy, hlen);
- if (mb_copy == NULL)
- return;
- send_packet(vifp, mb_copy);
- }
- static void
- send_packet(struct vif *vifp, struct mbuf *m)
- {
- struct ip_moptions imo;
- int error __unused;
- MRW_LOCK_ASSERT();
- NET_EPOCH_ASSERT();
- imo.imo_multicast_ifp = vifp->v_ifp;
- imo.imo_multicast_ttl = mtod(m, struct ip *)->ip_ttl - 1;
- imo.imo_multicast_loop = !!in_mcast_loop;
- imo.imo_multicast_vif = -1;
- STAILQ_INIT(&imo.imo_head);
- /*
- * Re-entrancy should not be a problem here, because
- * the packets that we send out and are looped back at us
- * should get rejected because they appear to come from
- * the loopback interface, thus preventing looping.
- */
- error = ip_output(m, NULL, NULL, IP_FORWARDING, &imo, NULL);
- CTR3(KTR_IPMF, "%s: vif %td err %d", __func__,
- (ptrdiff_t)(vifp - V_viftable), error);
- }
- /*
- * Stubs for old RSVP socket shim implementation.
- */
- static int
- X_ip_rsvp_vif(struct socket *so __unused, struct sockopt *sopt __unused)
- {
- return (EOPNOTSUPP);
- }
- static void
- X_ip_rsvp_force_done(struct socket *so __unused)
- {
- }
- static int
- X_rsvp_input(struct mbuf **mp, int *offp, int proto)
- {
- struct mbuf *m;
- m = *mp;
- *mp = NULL;
- if (!V_rsvp_on)
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /*
- * Code for bandwidth monitors
- */
- /*
- * Define common interface for timeval-related methods
- */
- #define BW_TIMEVALCMP(tvp, uvp, cmp) timevalcmp((tvp), (uvp), cmp)
- #define BW_TIMEVALDECR(vvp, uvp) timevalsub((vvp), (uvp))
- #define BW_TIMEVALADD(vvp, uvp) timevaladd((vvp), (uvp))
- static uint32_t
- compute_bw_meter_flags(struct bw_upcall *req)
- {
- uint32_t flags = 0;
- if (req->bu_flags & BW_UPCALL_UNIT_PACKETS)
- flags |= BW_METER_UNIT_PACKETS;
- if (req->bu_flags & BW_UPCALL_UNIT_BYTES)
- flags |= BW_METER_UNIT_BYTES;
- if (req->bu_flags & BW_UPCALL_GEQ)
- flags |= BW_METER_GEQ;
- if (req->bu_flags & BW_UPCALL_LEQ)
- flags |= BW_METER_LEQ;
- return flags;
- }
- static void
- expire_bw_meter_leq(void *arg)
- {
- struct bw_meter *x = arg;
- struct timeval now;
- /*
- * INFO:
- * callout is always executed with MRW_WLOCK taken
- */
- CURVNET_SET((struct vnet *)x->arg);
- microtime(&now);
- /*
- * Test if we should deliver an upcall
- */
- if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
- (x->bm_measured.b_packets <= x->bm_threshold.b_packets)) ||
- ((x->bm_flags & BW_METER_UNIT_BYTES) &&
- (x->bm_measured.b_bytes <= x->bm_threshold.b_bytes))) {
- /* Prepare an upcall for delivery */
- bw_meter_prepare_upcall(x, &now);
- }
- /* Send all upcalls that are pending delivery */
- taskqueue_enqueue(V_task_queue, &V_task);
- /* Reset counters */
- x->bm_start_time = now;
- /* Spin lock has to be taken as ip_forward context
- * might modify these fields as well
- */
- mtx_lock_spin(&x->bm_spin);
- x->bm_measured.b_bytes = 0;
- x->bm_measured.b_packets = 0;
- mtx_unlock_spin(&x->bm_spin);
- callout_schedule(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time));
- CURVNET_RESTORE();
- }
- /*
- * Add a bw_meter entry
- */
- static int
- add_bw_upcall(struct bw_upcall *req)
- {
- struct mfc *mfc;
- struct timeval delta = { BW_UPCALL_THRESHOLD_INTERVAL_MIN_SEC,
- BW_UPCALL_THRESHOLD_INTERVAL_MIN_USEC };
- struct timeval now;
- struct bw_meter *x, **bwm_ptr;
- uint32_t flags;
- if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
- return EOPNOTSUPP;
- /* Test if the flags are valid */
- if (!(req->bu_flags & (BW_UPCALL_UNIT_PACKETS | BW_UPCALL_UNIT_BYTES)))
- return EINVAL;
- if (!(req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)))
- return EINVAL;
- if ((req->bu_flags & (BW_UPCALL_GEQ | BW_UPCALL_LEQ)) == (BW_UPCALL_GEQ | BW_UPCALL_LEQ))
- return EINVAL;
- /* Test if the threshold time interval is valid */
- if (BW_TIMEVALCMP(&req->bu_threshold.b_time, &delta, <))
- return EINVAL;
- flags = compute_bw_meter_flags(req);
- /*
- * Find if we have already same bw_meter entry
- */
- MRW_WLOCK();
- mfc = mfc_find(&req->bu_src, &req->bu_dst);
- if (mfc == NULL) {
- MRW_WUNLOCK();
- return EADDRNOTAVAIL;
- }
- /* Choose an appropriate bw_meter list */
- if (req->bu_flags & BW_UPCALL_GEQ)
- bwm_ptr = &mfc->mfc_bw_meter_geq;
- else
- bwm_ptr = &mfc->mfc_bw_meter_leq;
- for (x = *bwm_ptr; x != NULL; x = x->bm_mfc_next) {
- if ((BW_TIMEVALCMP(&x->bm_threshold.b_time,
- &req->bu_threshold.b_time, ==))
- && (x->bm_threshold.b_packets
- == req->bu_threshold.b_packets)
- && (x->bm_threshold.b_bytes
- == req->bu_threshold.b_bytes)
- && (x->bm_flags & BW_METER_USER_FLAGS)
- == flags) {
- MRW_WUNLOCK();
- return 0; /* XXX Already installed */
- }
- }
- /* Allocate the new bw_meter entry */
- x = malloc(sizeof(*x), M_BWMETER, M_ZERO | M_NOWAIT);
- if (x == NULL) {
- MRW_WUNLOCK();
- return ENOBUFS;
- }
- /* Set the new bw_meter entry */
- x->bm_threshold.b_time = req->bu_threshold.b_time;
- microtime(&now);
- x->bm_start_time = now;
- x->bm_threshold.b_packets = req->bu_threshold.b_packets;
- x->bm_threshold.b_bytes = req->bu_threshold.b_bytes;
- x->bm_measured.b_packets = 0;
- x->bm_measured.b_bytes = 0;
- x->bm_flags = flags;
- x->bm_time_next = NULL;
- x->bm_mfc = mfc;
- x->arg = curvnet;
- sprintf(x->bm_spin_name, "BM spin %p", x);
- mtx_init(&x->bm_spin, x->bm_spin_name, NULL, MTX_SPIN);
- /* For LEQ case create periodic callout */
- if (req->bu_flags & BW_UPCALL_LEQ) {
- callout_init_rw(&x->bm_meter_callout, &mrouter_lock, CALLOUT_SHAREDLOCK);
- callout_reset(&x->bm_meter_callout, tvtohz(&x->bm_threshold.b_time),
- expire_bw_meter_leq, x);
- }
- /* Add the new bw_meter entry to the front of entries for this MFC */
- x->bm_mfc_next = *bwm_ptr;
- *bwm_ptr = x;
- MRW_WUNLOCK();
- return 0;
- }
- static void
- free_bw_list(struct bw_meter *list)
- {
- while (list != NULL) {
- struct bw_meter *x = list;
- /* MRW_WLOCK must be held here */
- if (x->bm_flags & BW_METER_LEQ) {
- callout_drain(&x->bm_meter_callout);
- mtx_destroy(&x->bm_spin);
- }
- list = list->bm_mfc_next;
- free(x, M_BWMETER);
- }
- }
- /*
- * Delete one or multiple bw_meter entries
- */
- static int
- del_bw_upcall(struct bw_upcall *req)
- {
- struct mfc *mfc;
- struct bw_meter *x, **bwm_ptr;
- if (!(V_mrt_api_config & MRT_MFC_BW_UPCALL))
- return EOPNOTSUPP;
- MRW_WLOCK();
- /* Find the corresponding MFC entry */
- mfc = mfc_find(&req->bu_src, &req->bu_dst);
- if (mfc == NULL) {
- MRW_WUNLOCK();
- return EADDRNOTAVAIL;
- } else if (req->bu_flags & BW_UPCALL_DELETE_ALL) {
- /*
- * Delete all bw_meter entries for this mfc
- */
- struct bw_meter *list;
- /* Free LEQ list */
- list = mfc->mfc_bw_meter_leq;
- mfc->mfc_bw_meter_leq = NULL;
- free_bw_list(list);
- /* Free GEQ list */
- list = mfc->mfc_bw_meter_geq;
- mfc->mfc_bw_meter_geq = NULL;
- free_bw_list(list);
- MRW_WUNLOCK();
- return 0;
- } else { /* Delete a single bw_meter entry */
- struct bw_meter *prev;
- uint32_t flags = 0;
- flags = compute_bw_meter_flags(req);
- /* Choose an appropriate bw_meter list */
- if (req->bu_flags & BW_UPCALL_GEQ)
- bwm_ptr = &mfc->mfc_bw_meter_geq;
- else
- bwm_ptr = &mfc->mfc_bw_meter_leq;
- /* Find the bw_meter entry to delete */
- for (prev = NULL, x = *bwm_ptr; x != NULL;
- prev = x, x = x->bm_mfc_next) {
- if ((BW_TIMEVALCMP(&x->bm_threshold.b_time, &req->bu_threshold.b_time, ==)) &&
- (x->bm_threshold.b_packets == req->bu_threshold.b_packets) &&
- (x->bm_threshold.b_bytes == req->bu_threshold.b_bytes) &&
- (x->bm_flags & BW_METER_USER_FLAGS) == flags)
- break;
- }
- if (x != NULL) { /* Delete entry from the list for this MFC */
- if (prev != NULL)
- prev->bm_mfc_next = x->bm_mfc_next; /* remove from middle*/
- else
- *bwm_ptr = x->bm_mfc_next;/* new head of list */
- if (req->bu_flags & BW_UPCALL_LEQ)
- callout_stop(&x->bm_meter_callout);
- MRW_WUNLOCK();
- /* Free the bw_meter entry */
- free(x, M_BWMETER);
- return 0;
- } else {
- MRW_WUNLOCK();
- return EINVAL;
- }
- }
- __assert_unreachable();
- }
- /*
- * Perform bandwidth measurement processing that may result in an upcall
- */
- static void
- bw_meter_geq_receive_packet(struct bw_meter *x, int plen, struct timeval *nowp)
- {
- struct timeval delta;
- MRW_LOCK_ASSERT();
- delta = *nowp;
- BW_TIMEVALDECR(&delta, &x->bm_start_time);
- /*
- * Processing for ">=" type of bw_meter entry.
- * bm_spin does not have to be hold here as in GEQ
- * case this is the only context accessing bm_measured.
- */
- if (BW_TIMEVALCMP(&delta, &x->bm_threshold.b_time, >)) {
- /* Reset the bw_meter entry */
- x->bm_start_time = *nowp;
- x->bm_measured.b_packets = 0;
- x->bm_measured.b_bytes = 0;
- x->bm_flags &= ~BW_METER_UPCALL_DELIVERED;
- }
- /* Record that a packet is received */
- x->bm_measured.b_packets++;
- x->bm_measured.b_bytes += plen;
- /*
- * Test if we should deliver an upcall
- */
- if (!(x->bm_flags & BW_METER_UPCALL_DELIVERED)) {
- if (((x->bm_flags & BW_METER_UNIT_PACKETS) &&
- (x->bm_measured.b_packets >= x->bm_threshold.b_packets)) ||
- ((x->bm_flags & BW_METER_UNIT_BYTES) &&
- (x->bm_measured.b_bytes >= x->bm_threshold.b_bytes))) {
- /* Prepare an upcall for delivery */
- bw_meter_prepare_upcall(x, nowp);
- x->bm_flags |= BW_METER_UPCALL_DELIVERED;
- }
- }
- }
- /*
- * Prepare a bandwidth-related upcall
- */
- static void
- bw_meter_prepare_upcall(struct bw_meter *x, struct timeval *nowp)
- {
- struct timeval delta;
- struct bw_upcall *u;
- MRW_LOCK_ASSERT();
- /*
- * Compute the measured time interval
- */
- delta = *nowp;
- BW_TIMEVALDECR(&delta, &x->bm_start_time);
- /*
- * Set the bw_upcall entry
- */
- u = malloc(sizeof(struct bw_upcall), M_MRTABLE, M_NOWAIT | M_ZERO);
- if (!u) {
- log(LOG_WARNING, "bw_meter_prepare_upcall: cannot allocate entry\n");
- return;
- }
- u->bu_src = x->bm_mfc->mfc_origin;
- u->bu_dst = x->bm_mfc->mfc_mcastgrp;
- u->bu_threshold.b_time = x->bm_threshold.b_time;
- u->bu_threshold.b_packets = x->bm_threshold.b_packets;
- u->bu_threshold.b_bytes = x->bm_threshold.b_bytes;
- u->bu_measured.b_time = delta;
- u->bu_measured.b_packets = x->bm_measured.b_packets;
- u->bu_measured.b_bytes = x->bm_measured.b_bytes;
- u->bu_flags = 0;
- if (x->bm_flags & BW_METER_UNIT_PACKETS)
- u->bu_flags |= BW_UPCALL_UNIT_PACKETS;
- if (x->bm_flags & BW_METER_UNIT_BYTES)
- u->bu_flags |= BW_UPCALL_UNIT_BYTES;
- if (x->bm_flags & BW_METER_GEQ)
- u->bu_flags |= BW_UPCALL_GEQ;
- if (x->bm_flags & BW_METER_LEQ)
- u->bu_flags |= BW_UPCALL_LEQ;
- if (buf_ring_enqueue(V_bw_upcalls_ring, u))
- log(LOG_WARNING, "bw_meter_prepare_upcall: cannot enqueue upcall\n");
- if (buf_ring_count(V_bw_upcalls_ring) > (BW_UPCALLS_MAX / 2)) {
- taskqueue_enqueue(V_task_queue, &V_task);
- }
- }
- /*
- * Send the pending bandwidth-related upcalls
- */
- static void
- bw_upcalls_send(void)
- {
- struct mbuf *m;
- int len = 0;
- struct bw_upcall *bu;
- struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
- static struct igmpmsg igmpmsg = {
- 0, /* unused1 */
- 0, /* unused2 */
- IGMPMSG_BW_UPCALL,/* im_msgtype */
- 0, /* im_mbz */
- 0, /* im_vif */
- 0, /* unused3 */
- { 0 }, /* im_src */
- { 0 } /* im_dst */
- };
- MRW_LOCK_ASSERT();
- if (buf_ring_empty(V_bw_upcalls_ring))
- return;
- /*
- * Allocate a new mbuf, initialize it with the header and
- * the payload for the pending calls.
- */
- m = m_gethdr(M_NOWAIT, MT_DATA);
- if (m == NULL) {
- log(LOG_WARNING, "bw_upcalls_send: cannot allocate mbuf\n");
- return;
- }
- m_copyback(m, 0, sizeof(struct igmpmsg), (caddr_t)&igmpmsg);
- len += sizeof(struct igmpmsg);
- while ((bu = buf_ring_dequeue_mc(V_bw_upcalls_ring)) != NULL) {
- m_copyback(m, len, sizeof(struct bw_upcall), (caddr_t)bu);
- len += sizeof(struct bw_upcall);
- free(bu, M_MRTABLE);
- }
- /*
- * Send the upcalls
- * XXX do we need to set the address in k_igmpsrc ?
- */
- MRTSTAT_INC(mrts_upcalls);
- if (socket_send(V_ip_mrouter, m, &k_igmpsrc) < 0) {
- log(LOG_WARNING, "bw_upcalls_send: ip_mrouter socket queue full\n");
- MRTSTAT_INC(mrts_upq_sockfull);
- }
- }
- /*
- * A periodic function for sending all upcalls that are pending delivery
- */
- static void
- expire_bw_upcalls_send(void *arg)
- {
- CURVNET_SET((struct vnet *) arg);
- /* This callout is run with MRW_RLOCK taken */
- bw_upcalls_send();
- callout_reset(&V_bw_upcalls_ch, BW_UPCALLS_PERIOD, expire_bw_upcalls_send,
- curvnet);
- CURVNET_RESTORE();
- }
- /*
- * End of bandwidth monitoring code
- */
- /*
- * Send the packet up to the user daemon, or eventually do kernel encapsulation
- *
- */
- static int
- pim_register_send(struct ip *ip, struct vif *vifp, struct mbuf *m,
- struct mfc *rt)
- {
- struct mbuf *mb_copy, *mm;
- /*
- * Do not send IGMP_WHOLEPKT notifications to userland, if the
- * rendezvous point was unspecified, and we were told not to.
- */
- if (pim_squelch_wholepkt != 0 && (V_mrt_api_config & MRT_MFC_RP) &&
- in_nullhost(rt->mfc_rp))
- return 0;
- mb_copy = pim_register_prepare(ip, m);
- if (mb_copy == NULL)
- return ENOBUFS;
- /*
- * Send all the fragments. Note that the mbuf for each fragment
- * is freed by the sending machinery.
- */
- for (mm = mb_copy; mm; mm = mb_copy) {
- mb_copy = mm->m_nextpkt;
- mm->m_nextpkt = 0;
- mm = m_pullup(mm, sizeof(struct ip));
- if (mm != NULL) {
- ip = mtod(mm, struct ip *);
- if ((V_mrt_api_config & MRT_MFC_RP) && !in_nullhost(rt->mfc_rp)) {
- pim_register_send_rp(ip, vifp, mm, rt);
- } else {
- pim_register_send_upcall(ip, vifp, mm, rt);
- }
- }
- }
- return 0;
- }
- /*
- * Return a copy of the data packet that is ready for PIM Register
- * encapsulation.
- * XXX: Note that in the returned copy the IP header is a valid one.
- */
- static struct mbuf *
- pim_register_prepare(struct ip *ip, struct mbuf *m)
- {
- struct mbuf *mb_copy = NULL;
- int mtu;
- /* Take care of delayed checksums */
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- in_delayed_cksum(m);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
- /*
- * Copy the old packet & pullup its IP header into the
- * new mbuf so we can modify it.
- */
- mb_copy = m_copypacket(m, M_NOWAIT);
- if (mb_copy == NULL)
- return NULL;
- mb_copy = m_pullup(mb_copy, ip->ip_hl << 2);
- if (mb_copy == NULL)
- return NULL;
- /* take care of the TTL */
- ip = mtod(mb_copy, struct ip *);
- --ip->ip_ttl;
- /* Compute the MTU after the PIM Register encapsulation */
- mtu = 0xffff - sizeof(pim_encap_iphdr) - sizeof(pim_encap_pimhdr);
- if (ntohs(ip->ip_len) <= mtu) {
- /* Turn the IP header into a valid one */
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(mb_copy, ip->ip_hl << 2);
- } else {
- /* Fragment the packet */
- mb_copy->m_pkthdr.csum_flags |= CSUM_IP;
- if (ip_fragment(ip, &mb_copy, mtu, 0) != 0) {
- m_freem(mb_copy);
- return NULL;
- }
- }
- return mb_copy;
- }
- /*
- * Send an upcall with the data packet to the user-level process.
- */
- static int
- pim_register_send_upcall(struct ip *ip, struct vif *vifp,
- struct mbuf *mb_copy, struct mfc *rt)
- {
- struct mbuf *mb_first;
- int len = ntohs(ip->ip_len);
- struct igmpmsg *im;
- struct sockaddr_in k_igmpsrc = { sizeof k_igmpsrc, AF_INET };
- MRW_LOCK_ASSERT();
- /*
- * Add a new mbuf with an upcall header
- */
- mb_first = m_gethdr(M_NOWAIT, MT_DATA);
- if (mb_first == NULL) {
- m_freem(mb_copy);
- return ENOBUFS;
- }
- mb_first->m_data += max_linkhdr;
- mb_first->m_pkthdr.len = len + sizeof(struct igmpmsg);
- mb_first->m_len = sizeof(struct igmpmsg);
- mb_first->m_next = mb_copy;
- /* Send message to routing daemon */
- im = mtod(mb_first, struct igmpmsg *);
- im->im_msgtype = IGMPMSG_WHOLEPKT;
- im->im_mbz = 0;
- im->im_vif = vifp - V_viftable;
- im->im_src = ip->ip_src;
- im->im_dst = ip->ip_dst;
- k_igmpsrc.sin_addr = ip->ip_src;
- MRTSTAT_INC(mrts_upcalls);
- if (socket_send(V_ip_mrouter, mb_first, &k_igmpsrc) < 0) {
- CTR1(KTR_IPMF, "%s: socket queue full", __func__);
- MRTSTAT_INC(mrts_upq_sockfull);
- return ENOBUFS;
- }
- /* Keep statistics */
- PIMSTAT_INC(pims_snd_registers_msgs);
- PIMSTAT_ADD(pims_snd_registers_bytes, len);
- return 0;
- }
- /*
- * Encapsulate the data packet in PIM Register message and send it to the RP.
- */
- static int
- pim_register_send_rp(struct ip *ip, struct vif *vifp, struct mbuf *mb_copy,
- struct mfc *rt)
- {
- struct mbuf *mb_first;
- struct ip *ip_outer;
- struct pim_encap_pimhdr *pimhdr;
- int len = ntohs(ip->ip_len);
- vifi_t vifi = rt->mfc_parent;
- MRW_LOCK_ASSERT();
- if ((vifi >= V_numvifs) || in_nullhost(V_viftable[vifi].v_lcl_addr)) {
- m_freem(mb_copy);
- return EADDRNOTAVAIL; /* The iif vif is invalid */
- }
- /*
- * Add a new mbuf with the encapsulating header
- */
- mb_first = m_gethdr(M_NOWAIT, MT_DATA);
- if (mb_first == NULL) {
- m_freem(mb_copy);
- return ENOBUFS;
- }
- mb_first->m_data += max_linkhdr;
- mb_first->m_len = sizeof(pim_encap_iphdr) + sizeof(pim_encap_pimhdr);
- mb_first->m_next = mb_copy;
- mb_first->m_pkthdr.len = len + mb_first->m_len;
- /*
- * Fill in the encapsulating IP and PIM header
- */
- ip_outer = mtod(mb_first, struct ip *);
- *ip_outer = pim_encap_iphdr;
- ip_outer->ip_len = htons(len + sizeof(pim_encap_iphdr) +
- sizeof(pim_encap_pimhdr));
- ip_outer->ip_src = V_viftable[vifi].v_lcl_addr;
- ip_outer->ip_dst = rt->mfc_rp;
- /*
- * Copy the inner header TOS to the outer header, and take care of the
- * IP_DF bit.
- */
- ip_outer->ip_tos = ip->ip_tos;
- if (ip->ip_off & htons(IP_DF))
- ip_outer->ip_off |= htons(IP_DF);
- ip_fillid(ip_outer);
- pimhdr = (struct pim_encap_pimhdr *)((caddr_t)ip_outer
- + sizeof(pim_encap_iphdr));
- *pimhdr = pim_encap_pimhdr;
- /* If the iif crosses a border, set the Border-bit */
- if (rt->mfc_flags[vifi] & MRT_MFC_FLAGS_BORDER_VIF & V_mrt_api_config)
- pimhdr->flags |= htonl(PIM_BORDER_REGISTER);
- mb_first->m_data += sizeof(pim_encap_iphdr);
- pimhdr->pim.pim_cksum = in_cksum(mb_first, sizeof(pim_encap_pimhdr));
- mb_first->m_data -= sizeof(pim_encap_iphdr);
- send_packet(vifp, mb_first);
- /* Keep statistics */
- PIMSTAT_INC(pims_snd_registers_msgs);
- PIMSTAT_ADD(pims_snd_registers_bytes, len);
- return 0;
- }
- /*
- * pim_encapcheck() is called by the encap4_input() path at runtime to
- * determine if a packet is for PIM; allowing PIM to be dynamically loaded
- * into the kernel.
- */
- static int
- pim_encapcheck(const struct mbuf *m __unused, int off __unused,
- int proto __unused, void *arg __unused)
- {
- KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
- return (8); /* claim the datagram. */
- }
- /*
- * PIM-SMv2 and PIM-DM messages processing.
- * Receives and verifies the PIM control messages, and passes them
- * up to the listening socket, using rip_input().
- * The only message with special processing is the PIM_REGISTER message
- * (used by PIM-SM): the PIM header is stripped off, and the inner packet
- * is passed to if_simloop().
- */
- static int
- pim_input(struct mbuf *m, int off, int proto, void *arg __unused)
- {
- struct ip *ip = mtod(m, struct ip *);
- struct pim *pim;
- int iphlen = off;
- int minlen;
- int datalen = ntohs(ip->ip_len) - iphlen;
- int ip_tos;
- /* Keep statistics */
- PIMSTAT_INC(pims_rcv_total_msgs);
- PIMSTAT_ADD(pims_rcv_total_bytes, datalen);
- /*
- * Validate lengths
- */
- if (datalen < PIM_MINLEN) {
- PIMSTAT_INC(pims_rcv_tooshort);
- CTR3(KTR_IPMF, "%s: short packet (%d) from 0x%08x",
- __func__, datalen, ntohl(ip->ip_src.s_addr));
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /*
- * If the packet is at least as big as a REGISTER, go agead
- * and grab the PIM REGISTER header size, to avoid another
- * possible m_pullup() later.
- *
- * PIM_MINLEN == pimhdr + u_int32_t == 4 + 4 = 8
- * PIM_REG_MINLEN == pimhdr + reghdr + encap_iphdr == 4 + 4 + 20 = 28
- */
- minlen = iphlen + (datalen >= PIM_REG_MINLEN ? PIM_REG_MINLEN : PIM_MINLEN);
- /*
- * Get the IP and PIM headers in contiguous memory, and
- * possibly the PIM REGISTER header.
- */
- if (m->m_len < minlen && (m = m_pullup(m, minlen)) == NULL) {
- CTR1(KTR_IPMF, "%s: m_pullup() failed", __func__);
- return (IPPROTO_DONE);
- }
- /* m_pullup() may have given us a new mbuf so reset ip. */
- ip = mtod(m, struct ip *);
- ip_tos = ip->ip_tos;
- /* adjust mbuf to point to the PIM header */
- m->m_data += iphlen;
- m->m_len -= iphlen;
- pim = mtod(m, struct pim *);
- /*
- * Validate checksum. If PIM REGISTER, exclude the data packet.
- *
- * XXX: some older PIMv2 implementations don't make this distinction,
- * so for compatibility reason perform the checksum over part of the
- * message, and if error, then over the whole message.
- */
- if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER && in_cksum(m, PIM_MINLEN) == 0) {
- /* do nothing, checksum okay */
- } else if (in_cksum(m, datalen)) {
- PIMSTAT_INC(pims_rcv_badsum);
- CTR1(KTR_IPMF, "%s: invalid checksum", __func__);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* PIM version check */
- if (PIM_VT_V(pim->pim_vt) < PIM_VERSION) {
- PIMSTAT_INC(pims_rcv_badversion);
- CTR3(KTR_IPMF, "%s: bad version %d expect %d", __func__,
- (int)PIM_VT_V(pim->pim_vt), PIM_VERSION);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* restore mbuf back to the outer IP */
- m->m_data -= iphlen;
- m->m_len += iphlen;
- if (PIM_VT_T(pim->pim_vt) == PIM_REGISTER) {
- /*
- * Since this is a REGISTER, we'll make a copy of the register
- * headers ip + pim + u_int32 + encap_ip, to be passed up to the
- * routing daemon.
- */
- struct sockaddr_in dst = { sizeof(dst), AF_INET };
- struct mbuf *mcp;
- struct ip *encap_ip;
- u_int32_t *reghdr;
- struct ifnet *vifp;
- MRW_RLOCK();
- if ((V_reg_vif_num >= V_numvifs) || (V_reg_vif_num == VIFI_INVALID)) {
- MRW_RUNLOCK();
- CTR2(KTR_IPMF, "%s: register vif not set: %d", __func__,
- (int)V_reg_vif_num);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* XXX need refcnt? */
- vifp = V_viftable[V_reg_vif_num].v_ifp;
- MRW_RUNLOCK();
- /*
- * Validate length
- */
- if (datalen < PIM_REG_MINLEN) {
- PIMSTAT_INC(pims_rcv_tooshort);
- PIMSTAT_INC(pims_rcv_badregisters);
- CTR1(KTR_IPMF, "%s: register packet size too small", __func__);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- reghdr = (u_int32_t *)(pim + 1);
- encap_ip = (struct ip *)(reghdr + 1);
- CTR3(KTR_IPMF, "%s: register: encap ip src 0x%08x len %d",
- __func__, ntohl(encap_ip->ip_src.s_addr),
- ntohs(encap_ip->ip_len));
- /* verify the version number of the inner packet */
- if (encap_ip->ip_v != IPVERSION) {
- PIMSTAT_INC(pims_rcv_badregisters);
- CTR1(KTR_IPMF, "%s: bad encap ip version", __func__);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* verify the inner packet is destined to a mcast group */
- if (!IN_MULTICAST(ntohl(encap_ip->ip_dst.s_addr))) {
- PIMSTAT_INC(pims_rcv_badregisters);
- CTR2(KTR_IPMF, "%s: bad encap ip dest 0x%08x", __func__,
- ntohl(encap_ip->ip_dst.s_addr));
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* If a NULL_REGISTER, pass it to the daemon */
- if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
- goto pim_input_to_daemon;
- /*
- * Copy the TOS from the outer IP header to the inner IP header.
- */
- if (encap_ip->ip_tos != ip_tos) {
- /* Outer TOS -> inner TOS */
- encap_ip->ip_tos = ip_tos;
- /* Recompute the inner header checksum. Sigh... */
- /* adjust mbuf to point to the inner IP header */
- m->m_data += (iphlen + PIM_MINLEN);
- m->m_len -= (iphlen + PIM_MINLEN);
- encap_ip->ip_sum = 0;
- encap_ip->ip_sum = in_cksum(m, encap_ip->ip_hl << 2);
- /* restore mbuf to point back to the outer IP header */
- m->m_data -= (iphlen + PIM_MINLEN);
- m->m_len += (iphlen + PIM_MINLEN);
- }
- /*
- * Decapsulate the inner IP packet and loopback to forward it
- * as a normal multicast packet. Also, make a copy of the
- * outer_iphdr + pimhdr + reghdr + encap_iphdr
- * to pass to the daemon later, so it can take the appropriate
- * actions (e.g., send back PIM_REGISTER_STOP).
- * XXX: here m->m_data points to the outer IP header.
- */
- mcp = m_copym(m, 0, iphlen + PIM_REG_MINLEN, M_NOWAIT);
- if (mcp == NULL) {
- CTR1(KTR_IPMF, "%s: m_copym() failed", __func__);
- m_freem(m);
- return (IPPROTO_DONE);
- }
- /* Keep statistics */
- /* XXX: registers_bytes include only the encap. mcast pkt */
- PIMSTAT_INC(pims_rcv_registers_msgs);
- PIMSTAT_ADD(pims_rcv_registers_bytes, ntohs(encap_ip->ip_len));
- /*
- * forward the inner ip packet; point m_data at the inner ip.
- */
- m_adj(m, iphlen + PIM_MINLEN);
- CTR4(KTR_IPMF,
- "%s: forward decap'd REGISTER: src %lx dst %lx vif %d",
- __func__,
- (u_long)ntohl(encap_ip->ip_src.s_addr),
- (u_long)ntohl(encap_ip->ip_dst.s_addr),
- (int)V_reg_vif_num);
- /* NB: vifp was collected above; can it change on us? */
- if_simloop(vifp, m, dst.sin_family, 0);
- /* prepare the register head to send to the mrouting daemon */
- m = mcp;
- }
- pim_input_to_daemon:
- /*
- * Pass the PIM message up to the daemon; if it is a Register message,
- * pass the 'head' only up to the daemon. This includes the
- * outer IP header, PIM header, PIM-Register header and the
- * inner IP header.
- * XXX: the outer IP header pkt size of a Register is not adjust to
- * reflect the fact that the inner multicast data is truncated.
- */
- return (rip_input(&m, &off, proto));
- }
- static int
- sysctl_mfctable(SYSCTL_HANDLER_ARGS)
- {
- struct mfc *rt;
- int error, i;
- if (req->newptr)
- return (EPERM);
- if (V_mfchashtbl == NULL) /* XXX unlocked */
- return (0);
- error = sysctl_wire_old_buffer(req, 0);
- if (error)
- return (error);
- MRW_RLOCK();
- for (i = 0; i < mfchashsize; i++) {
- LIST_FOREACH(rt, &V_mfchashtbl[i], mfc_hash) {
- error = SYSCTL_OUT(req, rt, sizeof(struct mfc));
- if (error)
- goto out_locked;
- }
- }
- out_locked:
- MRW_RUNLOCK();
- return (error);
- }
- static SYSCTL_NODE(_net_inet_ip, OID_AUTO, mfctable,
- CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_mfctable,
- "IPv4 Multicast Forwarding Table "
- "(struct *mfc[mfchashsize], netinet/ip_mroute.h)");
- static int
- sysctl_viflist(SYSCTL_HANDLER_ARGS)
- {
- int error, i;
- if (req->newptr)
- return (EPERM);
- if (V_viftable == NULL) /* XXX unlocked */
- return (0);
- error = sysctl_wire_old_buffer(req, MROUTE_VIF_SYSCTL_LEN * MAXVIFS);
- if (error)
- return (error);
- MRW_RLOCK();
- /* Copy out user-visible portion of vif entry. */
- for (i = 0; i < MAXVIFS; i++) {
- error = SYSCTL_OUT(req, &V_viftable[i], MROUTE_VIF_SYSCTL_LEN);
- if (error)
- break;
- }
- MRW_RUNLOCK();
- return (error);
- }
- SYSCTL_PROC(_net_inet_ip, OID_AUTO, viftable,
- CTLTYPE_OPAQUE | CTLFLAG_VNET | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
- sysctl_viflist, "S,vif[MAXVIFS]",
- "IPv4 Multicast Interfaces (struct vif[MAXVIFS], netinet/ip_mroute.h)");
- static void
- vnet_mroute_init(const void *unused __unused)
- {
- V_nexpire = malloc(mfchashsize, M_MRTABLE, M_WAITOK|M_ZERO);
- V_viftable = mallocarray(MAXVIFS, sizeof(*V_viftable),
- M_MRTABLE, M_WAITOK|M_ZERO);
- callout_init_rw(&V_expire_upcalls_ch, &mrouter_lock, 0);
- callout_init_rw(&V_bw_upcalls_ch, &mrouter_lock, 0);
- /* Prepare taskqueue */
- V_task_queue = taskqueue_create_fast("ip_mroute_tskq", M_NOWAIT,
- taskqueue_thread_enqueue, &V_task_queue);
- taskqueue_start_threads(&V_task_queue, 1, PI_NET, "ip_mroute_tskq task");
- }
- VNET_SYSINIT(vnet_mroute_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_init,
- NULL);
- static void
- vnet_mroute_uninit(const void *unused __unused)
- {
- /* Taskqueue should be cancelled and drained before freeing */
- taskqueue_free(V_task_queue);
- free(V_viftable, M_MRTABLE);
- free(V_nexpire, M_MRTABLE);
- V_nexpire = NULL;
- }
- VNET_SYSUNINIT(vnet_mroute_uninit, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE,
- vnet_mroute_uninit, NULL);
- static int
- ip_mroute_modevent(module_t mod, int type, void *unused)
- {
- switch (type) {
- case MOD_LOAD:
- MRW_LOCK_INIT();
- if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
- if_detached_event, NULL, EVENTHANDLER_PRI_ANY);
- if (if_detach_event_tag == NULL) {
- printf("ip_mroute: unable to register "
- "ifnet_departure_event handler\n");
- MRW_LOCK_DESTROY();
- return (EINVAL);
- }
- if (!powerof2(mfchashsize)) {
- printf("WARNING: %s not a power of 2; using default\n",
- "net.inet.ip.mfchashsize");
- mfchashsize = MFCHASHSIZE;
- }
- pim_encap_cookie = ip_encap_attach(&ipv4_encap_cfg, NULL, M_WAITOK);
- ip_mcast_src = X_ip_mcast_src;
- ip_mforward = X_ip_mforward;
- ip_mrouter_done = X_ip_mrouter_done;
- ip_mrouter_get = X_ip_mrouter_get;
- ip_mrouter_set = X_ip_mrouter_set;
- ip_rsvp_force_done = X_ip_rsvp_force_done;
- ip_rsvp_vif = X_ip_rsvp_vif;
- legal_vif_num = X_legal_vif_num;
- mrt_ioctl = X_mrt_ioctl;
- rsvp_input_p = X_rsvp_input;
- break;
- case MOD_UNLOAD:
- /*
- * Typically module unload happens after the user-level
- * process has shutdown the kernel services (the check
- * below insures someone can't just yank the module out
- * from under a running process). But if the module is
- * just loaded and then unloaded w/o starting up a user
- * process we still need to cleanup.
- */
- MRW_WLOCK();
- if (ip_mrouter_cnt != 0) {
- MRW_WUNLOCK();
- return (EINVAL);
- }
- ip_mrouter_unloading = 1;
- MRW_WUNLOCK();
- EVENTHANDLER_DEREGISTER(ifnet_departure_event, if_detach_event_tag);
- if (pim_encap_cookie) {
- ip_encap_detach(pim_encap_cookie);
- pim_encap_cookie = NULL;
- }
- ip_mcast_src = NULL;
- ip_mforward = NULL;
- ip_mrouter_done = NULL;
- ip_mrouter_get = NULL;
- ip_mrouter_set = NULL;
- ip_rsvp_force_done = NULL;
- ip_rsvp_vif = NULL;
- legal_vif_num = NULL;
- mrt_ioctl = NULL;
- rsvp_input_p = NULL;
- MRW_LOCK_DESTROY();
- break;
- default:
- return EOPNOTSUPP;
- }
- return 0;
- }
- static moduledata_t ip_mroutemod = {
- "ip_mroute",
- ip_mroute_modevent,
- 0
- };
- DECLARE_MODULE(ip_mroute, ip_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE);
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