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freebsd-skq/sys/netinet6/ip6_mroute.c
rwatson 9532a34956 When deciding whether to call m_pullup() even though there is adequate 
data in an mbuf, use M_WRITABLE() instead of a direct test of M_EXT;
the latter both unnecessarily exposes mbuf-allocator internals in the
protocol stack and is also insufficient to catch all cases of
non-writability.

(NB: m_pullup() does not actually guarantee that a writable mbuf is
returned, so further refinement of all of these code paths continues to
be required.)

Reviewed by:	bz
MFC after:	3 days
Sponsored by:	EMC / Isilon Storage Division
Differential Revision: https://reviews.freebsd.org/D900
2014-10-12 15:49:52 +00:00

1952 lines
49 KiB
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/*-
* 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.
* 4. 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/raw_cb.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 const struct protosw in6_pim_protosw = {
.pr_type = SOCK_RAW,
.pr_domain = &inet6domain,
.pr_protocol = IPPROTO_PIM,
.pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
.pr_input = pim6_input,
.pr_output = rip6_output,
.pr_ctloutput = rip6_ctloutput,
.pr_usrreqs = &rip6_usrreqs
};
static int pim6_encapcheck(const struct mbuf *, int, int, void *);
static VNET_DEFINE(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, 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 mtx mrouter6_mtx;
#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
#define MROUTER6_LOCK_ASSERT() do { \
mtx_assert(&mrouter6_mtx, MA_OWNED); \
NET_ASSERT_GIANT(); \
} while (0)
#define MROUTER6_LOCK_INIT() \
mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
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_LOCK() mtx_lock(&mfc6_mtx)
#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
#define MFC6_LOCK_ASSERT() do { \
mtx_assert(&mfc6_mtx, MA_OWNED); \
NET_ASSERT_GIANT(); \
} while (0)
#define MFC6_LOCK_INIT() \
mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
static u_char n6expire[MF6CTBLSIZ];
static struct mif6 mif6table[MAXMIFS];
SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD,
&mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]",
"IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)");
static struct mtx mif6_mtx;
#define MIF6_LOCK() mtx_lock(&mif6_mtx)
#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
#define MIF6_LOCK_INIT() \
mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
#ifdef MRT6DEBUG
static VNET_DEFINE(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
static VNET_DEFINE(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(&expire_upcalls_ch, 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 */
callout_stop(&expire_upcalls_ch);
/*
* 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();
/*
* 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);
}
}
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_copy(m, 0, M_COPYALL);
/*
* 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_copy(mb0, 0, sizeof(struct ip6_hdr));
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();
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;
}
}
}
MFC6_UNLOCK();
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;
/*
* Macro to send packet on mif. Since RSVP packets don't get counted on
* input, they shouldn't get counted on output, so statistics keeping is
* separate.
*/
#define MC6_SEND(ip6, mifp, m) do { \
if ((mifp)->m6_flags & MIFF_REGISTER) \
register_send((ip6), (mifp), (m)); \
else \
phyint_send((ip6), (mifp), (m)); \
} while (/*CONSTCOND*/ 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_copy(m, 0, sizeof(struct ip6_hdr));
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;
MC6_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_copy(m, 0, M_COPYALL);
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;
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;
error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o,
NULL, NULL);
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) {
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;
ip6_mloopback(ifp, m, &dst6);
}
/*
* 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_copy(m, 0, M_COPYALL)) == 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, int off, int proto, void *arg)
{
#ifdef DIAGNOSTIC
KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM"));
#endif
if (proto != IPPROTO_PIM)
return 0; /* not for us; reject the datagram. */
return 64; /* 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.
*/
int
pim6_input(struct mbuf **mp, int *offp, int proto)
{
struct pim *pim; /* pointer to a pim struct */
struct ip6_hdr *ip6;
int pimlen;
struct mbuf *m = *mp;
int minlen;
int off = *offp;
PIM6STAT_INC(pim6s_rcv_total);
ip6 = mtod(m, struct ip6_hdr *);
pimlen = m->m_pkthdr.len - *offp;
/*
* Validate lengths
*/
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
*/
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE);
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
/* adjust mbuf to point to the PIM header */
pim = (struct pim *)((caddr_t)ip6 + off);
#else
IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen);
if (pim == NULL) {
PIM6STAT_INC(pim6s_rcv_tooshort);
return (IPPROTO_DONE);
}
#endif
#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_NONE);
}
/* 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_copy(m, 0, off + PIM6_REG_MINLEN);
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:
rip6_input(&m, offp, proto);
return (IPPROTO_DONE);
}
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 = encap_attach_func(AF_INET6, IPPROTO_PIM,
pim6_encapcheck,
(const struct protosw *)&in6_pim_protosw, NULL);
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) {
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_PSEUDO, SI_ORDER_ANY);
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