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hardened/current/master
HardenedBSD/sys/netinet/ip_mroute.c
John Baldwin 28aafeb83c netinet*: Add assertions for some places that don't support M_EXTPG mbufs 
Found while auditing calls to M_WRITABLE to see if M_EXTPG could be
removed from its checks.

Reviewed by:	gallatin
Differential Revision:	https://reviews.freebsd.org/D46785
2024-10-31 16:32:32 -04:00

2898 lines
72 KiB
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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;
M_ASSERTMAPPED(m);
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);
M_ASSERTMAPPED(m);
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();
M_ASSERTMAPPED(m);
/*
* 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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