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freebsd-dev/sys/netinet6/ip6_mroute.c
Mark Johnston 353783964c ip6mrouter: Make the expiration callout MPSAFE 
- Protect the `expire_upcalls` callout with the MFC6 mutex.  The callout
  handler needs this mutex anyway.
- Convert the MROUTER6 mutex to a sleepable sx lock.  It is only used
  when configuring the global v6 multicast routing socket, so is only
  used in system call paths where sleeping is safe.  This lets us drain
  the callout without having to drop the lock.
- For all locking macros in the file, convert to using a _LOCKPTR macro.

Reported by:	mav
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D31836
2021-09-07 11:19:29 -04:00

1949 lines
49 KiB
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1998 WIDE Project.
* All rights reserved.
*
* 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 project 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 PROJECT 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 PROJECT 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.
*
* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
*/
/*-
* 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_mroute.c 8.2 (Berkeley) 11/15/93
* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
*/
/*
* 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 1994
*
* MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/callout.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/sdt.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/time.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/icmp6.h>
#include <netinet/ip_encap.h>
#include <netinet/ip6.h>
#include <netinet/in_kdtrace.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/pim6.h>
#include <netinet6/pim6_var.h>
static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
static int set_pim6(int *);
static int socket_send(struct socket *, struct mbuf *,
struct sockaddr_in6 *);
extern int in6_mcast_loop;
extern struct domain inet6domain;
static const struct encaptab *pim6_encap_cookie;
static int pim6_encapcheck(const struct mbuf *, int, int, void *);
static int pim6_input(struct mbuf *, int, int, void *);
static const struct encap_config ipv6_encap_cfg = {
.proto = IPPROTO_PIM,
.min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
.exact_match = 8,
.check = pim6_encapcheck,
.input = pim6_input
};
VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
SYSCTL_DECL(_net_inet6);
SYSCTL_DECL(_net_inet6_ip6);
static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"PIM");
static struct mrt6stat mrt6stat;
SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
&mrt6stat, mrt6stat,
"Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
#define MRT6STAT_INC(name) mrt6stat.name += 1
#define NO_RTE_FOUND 0x1
#define RTE_FOUND 0x2
static struct sx mrouter6_mtx;
#define MROUTER6_LOCKPTR() (&mrouter6_mtx)
#define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR())
#define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR())
#define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED
#define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6")
#define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR())
static struct mf6c *mf6ctable[MF6CTBLSIZ];
SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
&mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
"IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
"netinet6/ip6_mroute.h)");
static struct mtx mfc6_mtx;
#define MFC6_LOCKPTR() (&mfc6_mtx)
#define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR())
#define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR())
#define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED)
#define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \
"IPv6 multicast forwarding cache", \
NULL, MTX_DEF)
#define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR())
static u_char n6expire[MF6CTBLSIZ];
static struct mif6 mif6table[MAXMIFS];
static int
sysctl_mif6table(SYSCTL_HANDLER_ARGS)
{
struct mif6_sctl *out;
int error;
out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
M_WAITOK | M_ZERO);
for (int i = 0; i < MAXMIFS; i++) {
out[i].m6_flags = mif6table[i].m6_flags;
out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
if (mif6table[i].m6_ifp != NULL)
out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
else
out[i].m6_ifp = 0;
out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
}
error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
free(out, M_TEMP);
return (error);
}
SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
"IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
"netinet6/ip6_mroute.h)");
static struct mtx mif6_mtx;
#define MIF6_LOCKPTR() (&mif6_mtx)
#define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR())
#define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR())
#define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED)
#define MIF6_LOCK_INIT() \
mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF)
#define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR())
#ifdef MRT6DEBUG
VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
#define V_mrt6debug VNET(mrt6debug)
#define DEBUG_MFC 0x02
#define DEBUG_FORWARD 0x04
#define DEBUG_EXPIRE 0x08
#define DEBUG_XMIT 0x10
#define DEBUG_REG 0x20
#define DEBUG_PIM 0x40
#define DEBUG_ERR 0x80
#define DEBUG_ANY 0x7f
#define MRT6_DLOG(m, fmt, ...) \
if (V_mrt6debug & (m)) \
log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
"%s: " fmt "\n", __func__, ##__VA_ARGS__)
#else
#define MRT6_DLOG(m, fmt, ...)
#endif
static void expire_upcalls(void *);
#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
#define UPCALL_EXPIRE 6 /* number of timeouts */
/*
* XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
*/
/*
* 'Interfaces' associated with decapsulator (so we can tell
* packets that went through it from ones that get reflected
* by a broken gateway). Different from IPv4 register_if,
* these interfaces are linked into the system ifnet list,
* because per-interface IPv6 statistics are maintained in
* ifp->if_afdata. But it does not have any routes point
* to them. I.e., packets can't be sent this way. They
* only exist as a placeholder for multicast source
* verification.
*/
static struct ifnet *multicast_register_if6;
#define ENCAP_HOPS 64
/*
* Private variables.
*/
static mifi_t nummifs = 0;
static mifi_t reg_mif_num = (mifi_t)-1;
static struct pim6stat pim6stat;
SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
&pim6stat, pim6stat,
"PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
#define PIM6STAT_INC(name) pim6stat.name += 1
VNET_DEFINE_STATIC(int, pim6);
#define V_pim6 VNET(pim6)
/*
* Hash function for a source, group entry
*/
#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
(a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
(g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
(g).s6_addr32[2] ^ (g).s6_addr32[3])
/*
* Find a route for a given origin IPv6 address and Multicast group address.
*/
#define MF6CFIND(o, g, rt) do { \
struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
rt = NULL; \
while (_rt) { \
if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
(_rt->mf6c_stall == NULL)) { \
rt = _rt; \
break; \
} \
_rt = _rt->mf6c_next; \
} \
if (rt == NULL) { \
MRT6STAT_INC(mrt6s_mfc_misses); \
} \
} while (/*CONSTCOND*/ 0)
/*
* Macros to compute elapsed time efficiently
* Borrowed from Van Jacobson's scheduling code
* XXX: replace with timersub() ?
*/
#define TV_DELTA(a, b, delta) do { \
int xxs; \
\
delta = (a).tv_usec - (b).tv_usec; \
if ((xxs = (a).tv_sec - (b).tv_sec)) { \
switch (xxs) { \
case 2: \
delta += 1000000; \
/* FALLTHROUGH */ \
case 1: \
delta += 1000000; \
break; \
default: \
delta += (1000000 * xxs); \
} \
} \
} while (/*CONSTCOND*/ 0)
/* XXX: replace with timercmp(a, b, <) ? */
#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
(a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
#ifdef UPCALL_TIMING
#define UPCALL_MAX 50
static u_long upcall_data[UPCALL_MAX + 1];
static void collate();
#endif /* UPCALL_TIMING */
static int ip6_mrouter_init(struct socket *, int, int);
static int add_m6fc(struct mf6cctl *);
static int add_m6if(struct mif6ctl *);
static int del_m6fc(struct mf6cctl *);
static int del_m6if(mifi_t *);
static int del_m6if_locked(mifi_t *);
static int get_mif6_cnt(struct sioc_mif_req6 *);
static int get_sg_cnt(struct sioc_sg_req6 *);
static struct callout expire_upcalls_ch;
int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
int X_ip6_mrouter_done(void);
int X_ip6_mrouter_set(struct socket *, struct sockopt *);
int X_ip6_mrouter_get(struct socket *, struct sockopt *);
int X_mrt6_ioctl(u_long, caddr_t);
/*
* Handle MRT setsockopt commands to modify the multicast routing tables.
*/
int
X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
{
int error = 0;
int optval;
struct mif6ctl mifc;
struct mf6cctl mfcc;
mifi_t mifi;
if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
return (EPERM);
switch (sopt->sopt_name) {
case MRT6_INIT:
#ifdef MRT6_OINIT
case MRT6_OINIT:
#endif
error = sooptcopyin(sopt, &optval, sizeof(optval),
sizeof(optval));
if (error)
break;
error = ip6_mrouter_init(so, optval, sopt->sopt_name);
break;
case MRT6_DONE:
error = X_ip6_mrouter_done();
break;
case MRT6_ADD_MIF:
error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
if (error)
break;
error = add_m6if(&mifc);
break;
case MRT6_ADD_MFC:
error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
if (error)
break;
error = add_m6fc(&mfcc);
break;
case MRT6_DEL_MFC:
error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
if (error)
break;
error = del_m6fc(&mfcc);
break;
case MRT6_DEL_MIF:
error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
if (error)
break;
error = del_m6if(&mifi);
break;
case MRT6_PIM:
error = sooptcopyin(sopt, &optval, sizeof(optval),
sizeof(optval));
if (error)
break;
error = set_pim6(&optval);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
/*
* Handle MRT getsockopt commands
*/
int
X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt)
{
int error = 0;
if (so != V_ip6_mrouter)
return (EACCES);
switch (sopt->sopt_name) {
case MRT6_PIM:
error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6));
break;
}
return (error);
}
/*
* Handle ioctl commands to obtain information from the cache
*/
int
X_mrt6_ioctl(u_long cmd, caddr_t data)
{
int ret;
ret = EINVAL;
switch (cmd) {
case SIOCGETSGCNT_IN6:
ret = get_sg_cnt((struct sioc_sg_req6 *)data);
break;
case SIOCGETMIFCNT_IN6:
ret = get_mif6_cnt((struct sioc_mif_req6 *)data);
break;
default:
break;
}
return (ret);
}
/*
* returns the packet, byte, rpf-failure count for the source group provided
*/
static int
get_sg_cnt(struct sioc_sg_req6 *req)
{
struct mf6c *rt;
int ret;
ret = 0;
MFC6_LOCK();
MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
if (rt == NULL) {
ret = ESRCH;
} else {
req->pktcnt = rt->mf6c_pkt_cnt;
req->bytecnt = rt->mf6c_byte_cnt;
req->wrong_if = rt->mf6c_wrong_if;
}
MFC6_UNLOCK();
return (ret);
}
/*
* returns the input and output packet and byte counts on the mif provided
*/
static int
get_mif6_cnt(struct sioc_mif_req6 *req)
{
mifi_t mifi;
int ret;
ret = 0;
mifi = req->mifi;
MIF6_LOCK();
if (mifi >= nummifs) {
ret = EINVAL;
} else {
req->icount = mif6table[mifi].m6_pkt_in;
req->ocount = mif6table[mifi].m6_pkt_out;
req->ibytes = mif6table[mifi].m6_bytes_in;
req->obytes = mif6table[mifi].m6_bytes_out;
}
MIF6_UNLOCK();
return (ret);
}
static int
set_pim6(int *i)
{
if ((*i != 1) && (*i != 0))
return (EINVAL);
V_pim6 = *i;
return (0);
}
/*
* Enable multicast routing
*/
static int
ip6_mrouter_init(struct socket *so, int v, int cmd)
{
MRT6_DLOG(DEBUG_ANY, "so_type = %d, pr_protocol = %d",
so->so_type, so->so_proto->pr_protocol);
if (so->so_type != SOCK_RAW ||
so->so_proto->pr_protocol != IPPROTO_ICMPV6)
return (EOPNOTSUPP);
if (v != 1)
return (ENOPROTOOPT);
MROUTER6_LOCK();
if (V_ip6_mrouter != NULL) {
MROUTER6_UNLOCK();
return (EADDRINUSE);
}
V_ip6_mrouter = so;
V_ip6_mrouter_ver = cmd;
bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
bzero((caddr_t)n6expire, sizeof(n6expire));
V_pim6 = 0;/* used for stubbing out/in pim stuff */
callout_init_mtx(&expire_upcalls_ch, MFC6_LOCKPTR(), 0);
callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
expire_upcalls, NULL);
MROUTER6_UNLOCK();
MRT6_DLOG(DEBUG_ANY, "finished");
return (0);
}
/*
* Disable IPv6 multicast forwarding.
*/
int
X_ip6_mrouter_done(void)
{
mifi_t mifi;
u_long i;
struct mf6c *rt;
struct rtdetq *rte;
MROUTER6_LOCK();
if (V_ip6_mrouter == NULL) {
MROUTER6_UNLOCK();
return (EINVAL);
}
/*
* For each phyint in use, disable promiscuous reception of all IPv6
* multicasts.
*/
for (mifi = 0; mifi < nummifs; mifi++) {
if (mif6table[mifi].m6_ifp &&
!(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
if_allmulti(mif6table[mifi].m6_ifp, 0);
}
}
bzero((caddr_t)mif6table, sizeof(mif6table));
nummifs = 0;
V_pim6 = 0; /* used to stub out/in pim specific code */
/*
* Free all multicast forwarding cache entries.
*/
MFC6_LOCK();
for (i = 0; i < MF6CTBLSIZ; i++) {
rt = mf6ctable[i];
while (rt) {
struct mf6c *frt;
for (rte = rt->mf6c_stall; rte != NULL; ) {
struct rtdetq *n = rte->next;
m_freem(rte->m);
free(rte, M_MRTABLE6);
rte = n;
}
frt = rt;
rt = rt->mf6c_next;
free(frt, M_MRTABLE6);
}
}
bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
MFC6_UNLOCK();
callout_drain(&expire_upcalls_ch);
/*
* Reset register interface
*/
if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) {
if_detach(multicast_register_if6);
if_free(multicast_register_if6);
reg_mif_num = (mifi_t)-1;
multicast_register_if6 = NULL;
}
V_ip6_mrouter = NULL;
V_ip6_mrouter_ver = 0;
MROUTER6_UNLOCK();
MRT6_DLOG(DEBUG_ANY, "finished");
return (0);
}
static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
/*
* Add a mif to the mif table
*/
static int
add_m6if(struct mif6ctl *mifcp)
{
struct mif6 *mifp;
struct ifnet *ifp;
int error;
MIF6_LOCK();
if (mifcp->mif6c_mifi >= MAXMIFS) {
MIF6_UNLOCK();
return (EINVAL);
}
mifp = mif6table + mifcp->mif6c_mifi;
if (mifp->m6_ifp != NULL) {
MIF6_UNLOCK();
return (EADDRINUSE); /* XXX: is it appropriate? */
}
if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) {
MIF6_UNLOCK();
return (ENXIO);
}
ifp = ifnet_byindex(mifcp->mif6c_pifi);
if (mifcp->mif6c_flags & MIFF_REGISTER) {
if (reg_mif_num == (mifi_t)-1) {
ifp = if_alloc(IFT_OTHER);
if_initname(ifp, "register_mif", 0);
ifp->if_flags |= IFF_LOOPBACK;
if_attach(ifp);
multicast_register_if6 = ifp;
reg_mif_num = mifcp->mif6c_mifi;
/*
* it is impossible to guess the ifindex of the
* register interface. So mif6c_pifi is automatically
* calculated.
*/
mifcp->mif6c_pifi = ifp->if_index;
} else {
ifp = multicast_register_if6;
}
} else {
/* Make sure the interface supports multicast */
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
MIF6_UNLOCK();
return (EOPNOTSUPP);
}
error = if_allmulti(ifp, 1);
if (error) {
MIF6_UNLOCK();
return (error);
}
}
mifp->m6_flags = mifcp->mif6c_flags;
mifp->m6_ifp = ifp;
/* initialize per mif pkt counters */
mifp->m6_pkt_in = 0;
mifp->m6_pkt_out = 0;
mifp->m6_bytes_in = 0;
mifp->m6_bytes_out = 0;
/* Adjust nummifs up if the mifi is higher than nummifs */
if (nummifs <= mifcp->mif6c_mifi)
nummifs = mifcp->mif6c_mifi + 1;
MIF6_UNLOCK();
MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi,
if_name(ifp));
return (0);
}
/*
* Delete a mif from the mif table
*/
static int
del_m6if_locked(mifi_t *mifip)
{
struct mif6 *mifp = mif6table + *mifip;
mifi_t mifi;
struct ifnet *ifp;
MIF6_LOCK_ASSERT();
if (*mifip >= nummifs)
return (EINVAL);
if (mifp->m6_ifp == NULL)
return (EINVAL);
if (!(mifp->m6_flags & MIFF_REGISTER)) {
/* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */
ifp = mifp->m6_ifp;
if_allmulti(ifp, 0);
} else {
if (reg_mif_num != (mifi_t)-1 &&
multicast_register_if6 != NULL) {
if_detach(multicast_register_if6);
if_free(multicast_register_if6);
reg_mif_num = (mifi_t)-1;
multicast_register_if6 = NULL;
}
}
bzero((caddr_t)mifp, sizeof(*mifp));
/* Adjust nummifs down */
for (mifi = nummifs; mifi > 0; mifi--)
if (mif6table[mifi - 1].m6_ifp)
break;
nummifs = mifi;
MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", *mifip, nummifs);
return (0);
}
static int
del_m6if(mifi_t *mifip)
{
int cc;
MIF6_LOCK();
cc = del_m6if_locked(mifip);
MIF6_UNLOCK();
return (cc);
}
/*
* Add an mfc entry
*/
static int
add_m6fc(struct mf6cctl *mfccp)
{
struct mf6c *rt;
u_long hash;
struct rtdetq *rte;
u_short nstl;
char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
MFC6_LOCK();
MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
mfccp->mf6cc_mcastgrp.sin6_addr, rt);
/* If an entry already exists, just update the fields */
if (rt) {
MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x",
ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent);
rt->mf6c_parent = mfccp->mf6cc_parent;
rt->mf6c_ifset = mfccp->mf6cc_ifset;
MFC6_UNLOCK();
return (0);
}
/*
* Find the entry for which the upcall was made and update
*/
hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr,
mfccp->mf6cc_mcastgrp.sin6_addr);
for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) {
if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
&mfccp->mf6cc_origin.sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
&mfccp->mf6cc_mcastgrp.sin6_addr) &&
(rt->mf6c_stall != NULL)) {
if (nstl++)
log(LOG_ERR,
"add_m6fc: %s o %s g %s p %x dbx %p\n",
"multiple kernel entries",
ip6_sprintf(ip6bufo,
&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(ip6bufg,
&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent, rt->mf6c_stall);
MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p",
ip6_sprintf(ip6bufo,
&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(ip6bufg,
&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent, rt->mf6c_stall);
rt->mf6c_origin = mfccp->mf6cc_origin;
rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
rt->mf6c_parent = mfccp->mf6cc_parent;
rt->mf6c_ifset = mfccp->mf6cc_ifset;
/* initialize pkt counters per src-grp */
rt->mf6c_pkt_cnt = 0;
rt->mf6c_byte_cnt = 0;
rt->mf6c_wrong_if = 0;
rt->mf6c_expire = 0; /* Don't clean this guy up */
n6expire[hash]--;
/* free packets Qed at the end of this entry */
for (rte = rt->mf6c_stall; rte != NULL; ) {
struct rtdetq *n = rte->next;
ip6_mdq(rte->m, rte->ifp, rt);
m_freem(rte->m);
#ifdef UPCALL_TIMING
collate(&(rte->t));
#endif /* UPCALL_TIMING */
free(rte, M_MRTABLE6);
rte = n;
}
rt->mf6c_stall = NULL;
}
}
/*
* It is possible that an entry is being inserted without an upcall
*/
if (nstl == 0) {
MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash,
ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent);
for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr,
&mfccp->mf6cc_origin.sin6_addr)&&
IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr,
&mfccp->mf6cc_mcastgrp.sin6_addr)) {
rt->mf6c_origin = mfccp->mf6cc_origin;
rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
rt->mf6c_parent = mfccp->mf6cc_parent;
rt->mf6c_ifset = mfccp->mf6cc_ifset;
/* initialize pkt counters per src-grp */
rt->mf6c_pkt_cnt = 0;
rt->mf6c_byte_cnt = 0;
rt->mf6c_wrong_if = 0;
if (rt->mf6c_expire)
n6expire[hash]--;
rt->mf6c_expire = 0;
}
}
if (rt == NULL) {
/* no upcall, so make a new entry */
rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6,
M_NOWAIT);
if (rt == NULL) {
MFC6_UNLOCK();
return (ENOBUFS);
}
/* insert new entry at head of hash chain */
rt->mf6c_origin = mfccp->mf6cc_origin;
rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp;
rt->mf6c_parent = mfccp->mf6cc_parent;
rt->mf6c_ifset = mfccp->mf6cc_ifset;
/* initialize pkt counters per src-grp */
rt->mf6c_pkt_cnt = 0;
rt->mf6c_byte_cnt = 0;
rt->mf6c_wrong_if = 0;
rt->mf6c_expire = 0;
rt->mf6c_stall = NULL;
/* link into table */
rt->mf6c_next = mf6ctable[hash];
mf6ctable[hash] = rt;
}
}
MFC6_UNLOCK();
return (0);
}
#ifdef UPCALL_TIMING
/*
* collect delay statistics on the upcalls
*/
static void
collate(struct timeval *t)
{
u_long d;
struct timeval tp;
u_long delta;
GET_TIME(tp);
if (TV_LT(*t, tp))
{
TV_DELTA(tp, *t, delta);
d = delta >> 10;
if (d > UPCALL_MAX)
d = UPCALL_MAX;
++upcall_data[d];
}
}
#endif /* UPCALL_TIMING */
/*
* Delete an mfc entry
*/
static int
del_m6fc(struct mf6cctl *mfccp)
{
#ifdef MRT6DEBUG
char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
#endif
struct sockaddr_in6 origin;
struct sockaddr_in6 mcastgrp;
struct mf6c *rt;
struct mf6c **nptr;
u_long hash;
origin = mfccp->mf6cc_origin;
mcastgrp = mfccp->mf6cc_mcastgrp;
hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s",
ip6_sprintf(ip6bufo, &origin.sin6_addr),
ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr));
MFC6_LOCK();
nptr = &mf6ctable[hash];
while ((rt = *nptr) != NULL) {
if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr,
&rt->mf6c_origin.sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr,
&rt->mf6c_mcastgrp.sin6_addr) &&
rt->mf6c_stall == NULL)
break;
nptr = &rt->mf6c_next;
}
if (rt == NULL) {
MFC6_UNLOCK();
return (EADDRNOTAVAIL);
}
*nptr = rt->mf6c_next;
free(rt, M_MRTABLE6);
MFC6_UNLOCK();
return (0);
}
static int
socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src)
{
if (s) {
if (sbappendaddr(&s->so_rcv,
(struct sockaddr *)src,
mm, (struct mbuf *)0) != 0) {
sorwakeup(s);
return (0);
} else
soroverflow(s);
}
m_freem(mm);
return (-1);
}
/*
* IPv6 multicast forwarding function. This function assumes that the packet
* pointed to by "ip6" 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 IPv6 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.
*
* NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff
* this function is called in the originating context (i.e., not when
* forwarding a packet from other node). ip6_output(), which is currently the
* only function that calls this function is called in the originating context,
* explicitly ensures this condition. It is caller's responsibility to ensure
* that if this function is called from somewhere else in the originating
* context in the future.
*/
int
X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m)
{
struct rtdetq *rte;
struct mbuf *mb0;
struct mf6c *rt;
struct mif6 *mifp;
struct mbuf *mm;
u_long hash;
mifi_t mifi;
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
#ifdef UPCALL_TIMING
struct timeval tp;
GET_TIME(tp);
#endif /* UPCALL_TIMING */
MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d",
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index);
/*
* Don't forward a packet with Hop limit of zero or one,
* or a packet destined to a local-only group.
*/
if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) ||
IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
return (0);
ip6->ip6_hlim--;
/*
* Source address check: do not forward packets with unspecified
* source. It was discussed in July 2000, on ipngwg mailing list.
* This is rather more serious than unicast cases, because some
* MLD packets can be sent with the unspecified source address
* (although such packets must normally set 1 to the hop limit field).
*/
if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) {
IP6STAT_INC(ip6s_cantforward);
if (V_ip6_log_time + V_ip6_log_interval < time_uptime) {
V_ip6_log_time = time_uptime;
log(LOG_DEBUG,
"cannot forward "
"from %s to %s nxt %d received on %s\n",
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst),
ip6->ip6_nxt,
if_name(m->m_pkthdr.rcvif));
}
return (0);
}
MFC6_LOCK();
/*
* Determine forwarding mifs from the forwarding cache table
*/
MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
MRT6STAT_INC(mrt6s_mfc_lookups);
/* Entry exists, so forward if necessary */
if (rt) {
MFC6_UNLOCK();
return (ip6_mdq(m, ifp, rt));
}
/*
* If we don't have a route for packet's origin,
* Make a copy of the packet & send message to routing daemon.
*/
MRT6STAT_INC(mrt6s_no_route);
MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s",
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst));
/*
* Allocate mbufs early so that we don't do extra work if we
* are just going to fail anyway.
*/
rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT);
if (rte == NULL) {
MFC6_UNLOCK();
return (ENOBUFS);
}
mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT);
/*
* Pullup packet header if needed before storing it,
* as other references may modify it in the meantime.
*/
if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
if (mb0 == NULL) {
free(rte, M_MRTABLE6);
MFC6_UNLOCK();
return (ENOBUFS);
}
/* is there an upcall waiting for this packet? */
hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst);
for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) {
if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src,
&rt->mf6c_origin.sin6_addr) &&
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
&rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL))
break;
}
if (rt == NULL) {
struct mrt6msg *im;
#ifdef MRT6_OINIT
struct omrt6msg *oim;
#endif
/* no upcall, so make a new entry */
rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT);
if (rt == NULL) {
free(rte, M_MRTABLE6);
m_freem(mb0);
MFC6_UNLOCK();
return (ENOBUFS);
}
/*
* Make a copy of the header to send to the user
* level process
*/
mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT);
if (mm == NULL) {
free(rte, M_MRTABLE6);
m_freem(mb0);
free(rt, M_MRTABLE6);
MFC6_UNLOCK();
return (ENOBUFS);
}
/*
* Send message to routing daemon
*/
sin6.sin6_addr = ip6->ip6_src;
im = NULL;
#ifdef MRT6_OINIT
oim = NULL;
#endif
switch (V_ip6_mrouter_ver) {
#ifdef MRT6_OINIT
case MRT6_OINIT:
oim = mtod(mm, struct omrt6msg *);
oim->im6_msgtype = MRT6MSG_NOCACHE;
oim->im6_mbz = 0;
break;
#endif
case MRT6_INIT:
im = mtod(mm, struct mrt6msg *);
im->im6_msgtype = MRT6MSG_NOCACHE;
im->im6_mbz = 0;
break;
default:
free(rte, M_MRTABLE6);
m_freem(mb0);
free(rt, M_MRTABLE6);
MFC6_UNLOCK();
return (EINVAL);
}
MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel");
for (mifp = mif6table, mifi = 0;
mifi < nummifs && mifp->m6_ifp != ifp; mifp++, mifi++)
;
switch (V_ip6_mrouter_ver) {
#ifdef MRT6_OINIT
case MRT6_OINIT:
oim->im6_mif = mifi;
break;
#endif
case MRT6_INIT:
im->im6_mif = mifi;
break;
}
if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
"socket queue full\n");
MRT6STAT_INC(mrt6s_upq_sockfull);
free(rte, M_MRTABLE6);
m_freem(mb0);
free(rt, M_MRTABLE6);
MFC6_UNLOCK();
return (ENOBUFS);
}
MRT6STAT_INC(mrt6s_upcalls);
/* insert new entry at head of hash chain */
bzero(rt, sizeof(*rt));
rt->mf6c_origin.sin6_family = AF_INET6;
rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6);
rt->mf6c_origin.sin6_addr = ip6->ip6_src;
rt->mf6c_mcastgrp.sin6_family = AF_INET6;
rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6);
rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst;
rt->mf6c_expire = UPCALL_EXPIRE;
n6expire[hash]++;
rt->mf6c_parent = MF6C_INCOMPLETE_PARENT;
/* link into table */
rt->mf6c_next = mf6ctable[hash];
mf6ctable[hash] = rt;
/* Add this entry to the end of the queue */
rt->mf6c_stall = rte;
} else {
/* determine if q has overflowed */
struct rtdetq **p;
int npkts = 0;
for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next)
if (++npkts > MAX_UPQ6) {
MRT6STAT_INC(mrt6s_upq_ovflw);
free(rte, M_MRTABLE6);
m_freem(mb0);
MFC6_UNLOCK();
return (0);
}
/* Add this entry to the end of the queue */
*p = rte;
}
rte->next = NULL;
rte->m = mb0;
rte->ifp = ifp;
#ifdef UPCALL_TIMING
rte->t = tp;
#endif /* UPCALL_TIMING */
MFC6_UNLOCK();
return (0);
}
/*
* Clean up cache entries if upcalls are not serviced
* Call from the Slow Timeout mechanism, every half second.
*/
static void
expire_upcalls(void *unused)
{
#ifdef MRT6DEBUG
char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN];
#endif
struct rtdetq *rte;
struct mf6c *mfc, **nptr;
u_long i;
MFC6_LOCK_ASSERT();
for (i = 0; i < MF6CTBLSIZ; i++) {
if (n6expire[i] == 0)
continue;
nptr = &mf6ctable[i];
while ((mfc = *nptr) != NULL) {
rte = mfc->mf6c_stall;
/*
* Skip real cache entries
* Make sure it wasn't marked to not expire (shouldn't happen)
* If it expires now
*/
if (rte != NULL &&
mfc->mf6c_expire != 0 &&
--mfc->mf6c_expire == 0) {
MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)",
ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr),
ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr));
/*
* drop all the packets
* free the mbuf with the pkt, if, timing info
*/
do {
struct rtdetq *n = rte->next;
m_freem(rte->m);
free(rte, M_MRTABLE6);
rte = n;
} while (rte != NULL);
MRT6STAT_INC(mrt6s_cache_cleanups);
n6expire[i]--;
*nptr = mfc->mf6c_next;
free(mfc, M_MRTABLE6);
} else {
nptr = &mfc->mf6c_next;
}
}
}
callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
expire_upcalls, NULL);
}
/*
* Packet forwarding routine once entry in the cache is made
*/
static int
ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt)
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
mifi_t mifi, iif;
struct mif6 *mifp;
int plen = m->m_pkthdr.len;
struct in6_addr src0, dst0; /* copies for local work */
u_int32_t iszone, idzone, oszone, odzone;
int error = 0;
/*
* Don't forward if it didn't arrive from the parent mif
* for its origin.
*/
mifi = rt->mf6c_parent;
if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) {
/* came in the wrong interface */
MRT6_DLOG(DEBUG_FORWARD,
"wrong if: ifid %d mifi %d mififid %x", ifp->if_index,
mifi, mif6table[mifi].m6_ifp->if_index);
MRT6STAT_INC(mrt6s_wrong_if);
rt->mf6c_wrong_if++;
/*
* If we are doing PIM processing, and we are forwarding
* packets on this interface, send a message to the
* routing daemon.
*/
/* have to make sure this is a valid mif */
if (mifi < nummifs && mif6table[mifi].m6_ifp)
if (V_pim6 && (m->m_flags & M_LOOP) == 0) {
/*
* Check the M_LOOP flag to avoid an
* unnecessary PIM assert.
* XXX: M_LOOP is an ad-hoc hack...
*/
static struct sockaddr_in6 sin6 =
{ sizeof(sin6), AF_INET6 };
struct mbuf *mm;
struct mrt6msg *im;
#ifdef MRT6_OINIT
struct omrt6msg *oim;
#endif
mm = m_copym(m, 0, sizeof(struct ip6_hdr),
M_NOWAIT);
if (mm &&
(!M_WRITABLE(mm) ||
mm->m_len < sizeof(struct ip6_hdr)))
mm = m_pullup(mm, sizeof(struct ip6_hdr));
if (mm == NULL)
return (ENOBUFS);
#ifdef MRT6_OINIT
oim = NULL;
#endif
im = NULL;
switch (V_ip6_mrouter_ver) {
#ifdef MRT6_OINIT
case MRT6_OINIT:
oim = mtod(mm, struct omrt6msg *);
oim->im6_msgtype = MRT6MSG_WRONGMIF;
oim->im6_mbz = 0;
break;
#endif
case MRT6_INIT:
im = mtod(mm, struct mrt6msg *);
im->im6_msgtype = MRT6MSG_WRONGMIF;
im->im6_mbz = 0;
break;
default:
m_freem(mm);
return (EINVAL);
}
for (mifp = mif6table, iif = 0;
iif < nummifs && mifp &&
mifp->m6_ifp != ifp;
mifp++, iif++)
;
switch (V_ip6_mrouter_ver) {
#ifdef MRT6_OINIT
case MRT6_OINIT:
oim->im6_mif = iif;
sin6.sin6_addr = oim->im6_src;
break;
#endif
case MRT6_INIT:
im->im6_mif = iif;
sin6.sin6_addr = im->im6_src;
break;
}
MRT6STAT_INC(mrt6s_upcalls);
if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
MRT6_DLOG(DEBUG_ANY,
"ip6_mrouter socket queue full");
MRT6STAT_INC(mrt6s_upq_sockfull);
return (ENOBUFS);
} /* if socket Q full */
} /* if PIM */
return (0);
} /* if wrong iif */
/* If I sourced this packet, it counts as output, else it was input. */
if (m->m_pkthdr.rcvif == NULL) {
/* XXX: is rcvif really NULL when output?? */
mif6table[mifi].m6_pkt_out++;
mif6table[mifi].m6_bytes_out += plen;
} else {
mif6table[mifi].m6_pkt_in++;
mif6table[mifi].m6_bytes_in += plen;
}
rt->mf6c_pkt_cnt++;
rt->mf6c_byte_cnt += plen;
/*
* For each mif, forward a copy of the packet if there are group
* members downstream on the interface.
*/
src0 = ip6->ip6_src;
dst0 = ip6->ip6_dst;
if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 ||
(error = in6_setscope(&dst0, ifp, &idzone)) != 0) {
IP6STAT_INC(ip6s_badscope);
return (error);
}
for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) {
if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
/*
* check if the outgoing packet is going to break
* a scope boundary.
* XXX For packets through PIM register tunnel
* interface, we believe a routing daemon.
*/
if (!(mif6table[rt->mf6c_parent].m6_flags &
MIFF_REGISTER) &&
!(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
if (in6_setscope(&src0, mif6table[mifi].m6_ifp,
&oszone) ||
in6_setscope(&dst0, mif6table[mifi].m6_ifp,
&odzone) ||
iszone != oszone ||
idzone != odzone) {
IP6STAT_INC(ip6s_badscope);
continue;
}
}
mifp->m6_pkt_out++;
mifp->m6_bytes_out += plen;
if (mifp->m6_flags & MIFF_REGISTER)
register_send(ip6, mifp, m);
else
phyint_send(ip6, mifp, m);
}
}
return (0);
}
static void
phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m)
{
#ifdef MRT6DEBUG
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
#endif
struct mbuf *mb_copy;
struct ifnet *ifp = mifp->m6_ifp;
int error = 0;
u_long linkmtu;
/*
* Make a new reference to the packet; make sure that
* the IPv6 header is actually copied, not just referenced,
* so that ip6_output() only scribbles on the copy.
*/
mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT);
if (mb_copy &&
(!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
if (mb_copy == NULL) {
return;
}
/* set MCAST flag to the outgoing packet */
mb_copy->m_flags |= M_MCAST;
/*
* If we sourced the packet, call ip6_output since we may devide
* the packet into fragments when the packet is too big for the
* outgoing interface.
* Otherwise, we can simply send the packet to the interface
* sending queue.
*/
if (m->m_pkthdr.rcvif == NULL) {
struct ip6_moptions im6o;
struct epoch_tracker et;
im6o.im6o_multicast_ifp = ifp;
/* XXX: ip6_output will override ip6->ip6_hlim */
im6o.im6o_multicast_hlim = ip6->ip6_hlim;
im6o.im6o_multicast_loop = 1;
NET_EPOCH_ENTER(et);
error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
NULL, NULL);
NET_EPOCH_EXIT(et);
MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
(uint16_t)(mifp - mif6table), error);
return;
}
/*
* If configured to loop back multicasts by default,
* loop back a copy now.
*/
if (in6_mcast_loop)
ip6_mloopback(ifp, m);
/*
* Put the packet into the sending queue of the outgoing interface
* if it would fit in the MTU of the interface.
*/
linkmtu = IN6_LINKMTU(ifp);
if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) {
struct sockaddr_in6 dst6;
bzero(&dst6, sizeof(dst6));
dst6.sin6_len = sizeof(struct sockaddr_in6);
dst6.sin6_family = AF_INET6;
dst6.sin6_addr = ip6->ip6_dst;
IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
/*
* We just call if_output instead of nd6_output here, since
* we need no ND for a multicast forwarded packet...right?
*/
m_clrprotoflags(m); /* Avoid confusing lower layers. */
error = (*ifp->if_output)(ifp, mb_copy,
(struct sockaddr *)&dst6, NULL);
MRT6_DLOG(DEBUG_XMIT, "mif %u err %d",
(uint16_t)(mifp - mif6table), error);
} else {
/*
* pMTU discovery is intentionally disabled by default, since
* various router may notify pMTU in multicast, which can be
* a DDoS to a router
*/
if (V_ip6_mcast_pmtu)
icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
else {
MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s "
"g %s size %d (discarded)", if_name(ifp),
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst),
mb_copy->m_pkthdr.len);
m_freem(mb_copy); /* simply discard the packet */
}
}
}
static int
register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m)
{
#ifdef MRT6DEBUG
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
#endif
struct mbuf *mm;
int i, len = m->m_pkthdr.len;
static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
struct mrt6msg *im6;
MRT6_DLOG(DEBUG_ANY, "src %s dst %s",
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst));
PIM6STAT_INC(pim6s_snd_registers);
/* Make a copy of the packet to send to the user level process. */
mm = m_gethdr(M_NOWAIT, MT_DATA);
if (mm == NULL)
return (ENOBUFS);
mm->m_data += max_linkhdr;
mm->m_len = sizeof(struct ip6_hdr);
if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
m_freem(mm);
return (ENOBUFS);
}
i = MHLEN - M_LEADINGSPACE(mm);
if (i > len)
i = len;
mm = m_pullup(mm, i);
if (mm == NULL)
return (ENOBUFS);
/* TODO: check it! */
mm->m_pkthdr.len = len + sizeof(struct ip6_hdr);
/*
* Send message to routing daemon
*/
sin6.sin6_addr = ip6->ip6_src;
im6 = mtod(mm, struct mrt6msg *);
im6->im6_msgtype = MRT6MSG_WHOLEPKT;
im6->im6_mbz = 0;
im6->im6_mif = mif - mif6table;
/* iif info is not given for reg. encap.n */
MRT6STAT_INC(mrt6s_upcalls);
if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) {
MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full");
MRT6STAT_INC(mrt6s_upq_sockfull);
return (ENOBUFS);
}
return (0);
}
/*
* pim6_encapcheck() is called by the encap6_input() path at runtime to
* determine if a packet is for PIM; allowing PIM to be dynamically loaded
* into the kernel.
*/
static int
pim6_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 sparse mode hook
* Receives the pim control messages, and passes them up to the listening
* socket, using rip6_input.
* The only message processed is the REGISTER pim message; the pim header
* is stripped off, and the inner packet is passed to register_mforward.
*/
static int
pim6_input(struct mbuf *m, int off, int proto, void *arg __unused)
{
struct pim *pim; /* pointer to a pim struct */
struct ip6_hdr *ip6;
int pimlen;
int minlen;
PIM6STAT_INC(pim6s_rcv_total);
/*
* Validate lengths
*/
pimlen = m->m_pkthdr.len - off;
if (pimlen < PIM_MINLEN) {
PIM6STAT_INC(pim6s_rcv_tooshort);
MRT6_DLOG(DEBUG_PIM, "PIM packet too short");
m_freem(m);
return (IPPROTO_DONE);
}
/*
* if the packet is at least as big as a REGISTER, go ahead
* and grab the PIM REGISTER header size, to avoid another
* possible m_pullup() later.
*
* PIM_MINLEN == pimhdr + u_int32 == 8
* PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40
*/
minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN;
/*
* Make sure that the IP6 and PIM headers in contiguous memory, and
* possibly the PIM REGISTER header
*/
if (m->m_len < off + minlen) {
m = m_pullup(m, off + minlen);
if (m == NULL) {
IP6STAT_INC(ip6s_exthdrtoolong);
return (IPPROTO_DONE);
}
}
ip6 = mtod(m, struct ip6_hdr *);
pim = (struct pim *)((caddr_t)ip6 + off);
#define PIM6_CHECKSUM
#ifdef PIM6_CHECKSUM
{
int cksumlen;
/*
* Validate checksum.
* If PIM REGISTER, exclude the data packet
*/
if (pim->pim_type == PIM_REGISTER)
cksumlen = PIM_MINLEN;
else
cksumlen = pimlen;
if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) {
PIM6STAT_INC(pim6s_rcv_badsum);
MRT6_DLOG(DEBUG_PIM, "invalid checksum");
m_freem(m);
return (IPPROTO_DONE);
}
}
#endif /* PIM_CHECKSUM */
/* PIM version check */
if (pim->pim_ver != PIM_VERSION) {
PIM6STAT_INC(pim6s_rcv_badversion);
MRT6_DLOG(DEBUG_ANY | DEBUG_ERR,
"incorrect version %d, expecting %d",
pim->pim_ver, PIM_VERSION);
m_freem(m);
return (IPPROTO_DONE);
}
if (pim->pim_type == PIM_REGISTER) {
/*
* since this is a REGISTER, we'll make a copy of the register
* headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the
* routing daemon.
*/
static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 };
struct mbuf *mcp;
struct ip6_hdr *eip6;
u_int32_t *reghdr;
int rc;
#ifdef MRT6DEBUG
char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
#endif
PIM6STAT_INC(pim6s_rcv_registers);
if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
MRT6_DLOG(DEBUG_PIM, "register mif not set: %d",
reg_mif_num);
m_freem(m);
return (IPPROTO_DONE);
}
reghdr = (u_int32_t *)(pim + 1);
if ((ntohl(*reghdr) & PIM_NULL_REGISTER))
goto pim6_input_to_daemon;
/*
* Validate length
*/
if (pimlen < PIM6_REG_MINLEN) {
PIM6STAT_INC(pim6s_rcv_tooshort);
PIM6STAT_INC(pim6s_rcv_badregisters);
MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet "
"size too small %d from %s",
pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src));
m_freem(m);
return (IPPROTO_DONE);
}
eip6 = (struct ip6_hdr *) (reghdr + 1);
MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d",
ip6_sprintf(ip6bufs, &eip6->ip6_src),
ip6_sprintf(ip6bufd, &eip6->ip6_dst),
ntohs(eip6->ip6_plen));
/* verify the version number of the inner packet */
if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
PIM6STAT_INC(pim6s_rcv_badregisters);
MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) "
"of the inner packet",
(eip6->ip6_vfc & IPV6_VERSION));
m_freem(m);
return (IPPROTO_DONE);
}
/* verify the inner packet is destined to a mcast group */
if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) {
PIM6STAT_INC(pim6s_rcv_badregisters);
MRT6_DLOG(DEBUG_PIM, "inner packet of register "
"is not multicast %s",
ip6_sprintf(ip6bufd, &eip6->ip6_dst));
m_freem(m);
return (IPPROTO_DONE);
}
/*
* make a copy of the whole header to pass to the daemon later.
*/
mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
if (mcp == NULL) {
MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: "
"could not copy register head");
m_freem(m);
return (IPPROTO_DONE);
}
/*
* forward the inner ip6 packet; point m_data at the inner ip6.
*/
m_adj(m, off + PIM_MINLEN);
MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: "
"src %s, dst %s, mif %d",
ip6_sprintf(ip6bufs, &eip6->ip6_src),
ip6_sprintf(ip6bufd, &eip6->ip6_dst), reg_mif_num);
rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m,
dst.sin6_family, 0);
/* prepare the register head to send to the mrouting daemon */
m = mcp;
}
/*
* 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
* encapsulator ip6 header, pim header, register header and the
* encapsulated ip6 header.
*/
pim6_input_to_daemon:
return (rip6_input(&m, &off, proto));
}
static int
ip6_mroute_modevent(module_t mod, int type, void *unused)
{
switch (type) {
case MOD_LOAD:
MROUTER6_LOCK_INIT();
MFC6_LOCK_INIT();
MIF6_LOCK_INIT();
pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg,
NULL, M_WAITOK);
if (pim6_encap_cookie == NULL) {
printf("ip6_mroute: unable to attach pim6 encap\n");
MIF6_LOCK_DESTROY();
MFC6_LOCK_DESTROY();
MROUTER6_LOCK_DESTROY();
return (EINVAL);
}
ip6_mforward = X_ip6_mforward;
ip6_mrouter_done = X_ip6_mrouter_done;
ip6_mrouter_get = X_ip6_mrouter_get;
ip6_mrouter_set = X_ip6_mrouter_set;
mrt6_ioctl = X_mrt6_ioctl;
break;
case MOD_UNLOAD:
if (V_ip6_mrouter != NULL)
return EINVAL;
if (pim6_encap_cookie) {
ip6_encap_detach(pim6_encap_cookie);
pim6_encap_cookie = NULL;
}
X_ip6_mrouter_done();
ip6_mforward = NULL;
ip6_mrouter_done = NULL;
ip6_mrouter_get = NULL;
ip6_mrouter_set = NULL;
mrt6_ioctl = NULL;
MIF6_LOCK_DESTROY();
MFC6_LOCK_DESTROY();
MROUTER6_LOCK_DESTROY();
break;
default:
return (EOPNOTSUPP);
}
return (0);
}
static moduledata_t ip6_mroutemod = {
"ip6_mroute",
ip6_mroute_modevent,
0
};
DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_ANY);
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