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4f27ab21b8
NetBSD/sys/netinet6/ip6_mroute.c
perry 4f27ab21b8 /*CONTCOND*/ while (0)'ed macros
2002-11-02 07:30:55 +00:00

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/* $NetBSD: ip6_mroute.c,v 1.39 2002/11/02 07:30:57 perry Exp $ */
/* $KAME: ip6_mroute.c,v 1.49 2001/07/25 09:21:18 jinmei Exp $ */
/*
* 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.
*/
/* 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>
__KERNEL_RCSID(0, "$NetBSD: ip6_mroute.c,v 1.39 2002/11/02 07:30:57 perry Exp $");
#include "opt_inet.h"
#ifndef _KERNEL
# ifdef KERNEL
# define _KERNEL
# endif
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_mroute.h>
#include <netinet6/pim6.h>
#include <netinet6/pim6_var.h>
#include <netinet6/nd6.h>
#include <net/net_osdep.h>
static int ip6_mdq __P((struct mbuf *, struct ifnet *, struct mf6c *));
static void phyint_send __P((struct ip6_hdr *, struct mif6 *, struct mbuf *));
static int set_pim6 __P((int *));
static int get_pim6 __P((struct mbuf *));
static int socket_send __P((struct socket *, struct mbuf *,
struct sockaddr_in6 *));
static int register_send __P((struct ip6_hdr *, struct mif6 *,
struct mbuf *));
/*
* Globals. All but ip6_mrouter, ip6_mrtproto and mrt6stat could be static,
* except for netstat or debugging purposes.
*/
struct socket *ip6_mrouter = NULL;
int ip6_mrouter_ver = 0;
int ip6_mrtproto = IPPROTO_PIM; /* for netstat only */
struct mrt6stat mrt6stat;
#define NO_RTE_FOUND 0x1
#define RTE_FOUND 0x2
struct mf6c *mf6ctable[MF6CTBLSIZ];
u_char n6expire[MF6CTBLSIZ];
static struct mif6 mif6table[MAXMIFS];
#ifdef MRT6DEBUG
u_int mrt6debug = 0; /* debug level */
#define DEBUG_MFC 0x02
#define DEBUG_FORWARD 0x04
#define DEBUG_EXPIRE 0x08
#define DEBUG_XMIT 0x10
#define DEBUG_REG 0x20
#define DEBUG_PIM 0x40
#endif
static void expire_upcalls __P((void *));
#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
#define UPCALL_EXPIRE 6 /* number of timeouts */
#ifdef INET
#ifdef MROUTING
extern struct socket *ip_mrouter;
#endif
#endif
/*
* 'Interfaces' associated with decapsulator (so we can tell
* packets that went through it from ones that get reflected
* by a broken gateway). These interfaces are never linked into
* the system ifnet list & no routes point to them. I.e., packets
* can't be sent this way. They only exist as a placeholder for
* multicast source verification.
*/
struct ifnet multicast_register_if;
#define ENCAP_HOPS 64
/*
* Private variables.
*/
static mifi_t nummifs = 0;
static mifi_t reg_mif_num = (mifi_t)-1;
static struct pim6stat pim6stat;
static int 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.
* Quality of service parameter to be added in the future!!!
*/
#define MF6CFIND(o, g, rt) do { \
struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
rt = NULL; \
mrt6stat.mrt6s_mfc_lookups++; \
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.mrt6s_mfc_misses++; \
} \
} while (/*CONSTCOND*/ 0)
/*
* Macros to compute elapsed time efficiently
* Borrowed from Van Jacobson's scheduling code
*/
#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)
#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
u_long upcall_data[UPCALL_MAX + 1];
static void collate();
#endif /* UPCALL_TIMING */
static int get_sg_cnt __P((struct sioc_sg_req6 *));
static int get_mif6_cnt __P((struct sioc_mif_req6 *));
static int ip6_mrouter_init __P((struct socket *, struct mbuf *, int));
static int add_m6if __P((struct mif6ctl *));
static int del_m6if __P((mifi_t *));
static int add_m6fc __P((struct mf6cctl *));
static int del_m6fc __P((struct mf6cctl *));
static struct callout expire_upcalls_ch = CALLOUT_INITIALIZER;
/*
* Handle MRT setsockopt commands to modify the multicast routing tables.
*/
int
ip6_mrouter_set(cmd, so, m)
int cmd;
struct socket *so;
struct mbuf *m;
{
if (cmd != MRT6_INIT && so != ip6_mrouter)
return EACCES;
switch (cmd) {
case MRT6_OINIT: return ip6_mrouter_init(so, m, cmd);
case MRT6_INIT: return ip6_mrouter_init(so, m, cmd);
case MRT6_DONE: return ip6_mrouter_done();
case MRT6_ADD_MIF: return add_m6if(mtod(m, struct mif6ctl *));
case MRT6_DEL_MIF: return del_m6if(mtod(m, mifi_t *));
case MRT6_ADD_MFC: return add_m6fc(mtod(m, struct mf6cctl *));
case MRT6_DEL_MFC: return del_m6fc(mtod(m, struct mf6cctl *));
case MRT6_PIM: return set_pim6(mtod(m, int *));
default: return EOPNOTSUPP;
}
}
/*
* Handle MRT getsockopt commands
*/
int
ip6_mrouter_get(cmd, so, m)
int cmd;
struct socket *so;
struct mbuf **m;
{
struct mbuf *mb;
if (so != ip6_mrouter) return EACCES;
*m = mb = m_get(M_WAIT, MT_SOOPTS);
switch (cmd) {
case MRT6_PIM:
return get_pim6(mb);
default:
m_free(mb);
return EOPNOTSUPP;
}
}
/*
* Handle ioctl commands to obtain information from the cache
*/
int
mrt6_ioctl(cmd, data)
int cmd;
caddr_t data;
{
switch (cmd) {
case SIOCGETSGCNT_IN6:
return (get_sg_cnt((struct sioc_sg_req6 *)data));
case SIOCGETMIFCNT_IN6:
return (get_mif6_cnt((struct sioc_mif_req6 *)data));
default:
return (EINVAL);
}
}
/*
* returns the packet, byte, rpf-failure count for the source group provided
*/
static int
get_sg_cnt(req)
struct sioc_sg_req6 *req;
{
struct mf6c *rt;
int s;
s = splsoftnet();
MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt);
splx(s);
if (rt != NULL) {
req->pktcnt = rt->mf6c_pkt_cnt;
req->bytecnt = rt->mf6c_byte_cnt;
req->wrong_if = rt->mf6c_wrong_if;
} else
return (ESRCH);
#if 0
req->pktcnt = req->bytecnt = req->wrong_if = 0xffffffff;
#endif
return 0;
}
/*
* returns the input and output packet and byte counts on the mif provided
*/
static int
get_mif6_cnt(req)
struct sioc_mif_req6 *req;
{
mifi_t mifi = req->mifi;
if (mifi >= nummifs)
return EINVAL;
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;
return 0;
}
/*
* Get PIM processiong global
*/
static int
get_pim6(m)
struct mbuf *m;
{
int *i;
i = mtod(m, int *);
*i = pim6;
return 0;
}
static int
set_pim6(i)
int *i;
{
if ((*i != 1) && (*i != 0))
return EINVAL;
pim6 = *i;
return 0;
}
/*
* Enable multicast routing
*/
static int
ip6_mrouter_init(so, m, cmd)
struct socket *so;
struct mbuf *m;
int cmd;
{
int *v;
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG,
"ip6_mrouter_init: so_type = %d, pr_protocol = %d\n",
so->so_type, so->so_proto->pr_protocol);
#endif
if (so->so_type != SOCK_RAW ||
so->so_proto->pr_protocol != IPPROTO_ICMPV6)
return EOPNOTSUPP;
if (!m || (m->m_len != sizeof(int *)))
return ENOPROTOOPT;
v = mtod(m, int *);
if (*v != 1)
return ENOPROTOOPT;
if (ip6_mrouter != NULL) return EADDRINUSE;
ip6_mrouter = so;
ip6_mrouter_ver = cmd;
bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
bzero((caddr_t)n6expire, sizeof(n6expire));
pim6 = 0;/* used for stubbing out/in pim stuff */
callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
expire_upcalls, NULL);
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG, "ip6_mrouter_init\n");
#endif
return 0;
}
/*
* Disable multicast routing
*/
int
ip6_mrouter_done()
{
mifi_t mifi;
int i;
struct ifnet *ifp;
struct in6_ifreq ifr;
struct mf6c *rt;
struct rtdetq *rte;
int s;
s = splsoftnet();
/*
* For each phyint in use, disable promiscuous reception of all IPv6
* multicasts.
*/
#ifdef INET
#ifdef MROUTING
/*
* If there is still IPv4 multicast routing daemon,
* we remain interfaces to receive all muliticasted packets.
* XXX: there may be an interface in which the IPv4 multicast
* daemon is not interested...
*/
if (!ip_mrouter)
#endif
#endif
{
for (mifi = 0; mifi < nummifs; mifi++) {
if (mif6table[mifi].m6_ifp &&
!(mif6table[mifi].m6_flags & MIFF_REGISTER)) {
ifr.ifr_addr.sin6_family = AF_INET6;
ifr.ifr_addr.sin6_addr= in6addr_any;
ifp = mif6table[mifi].m6_ifp;
(*ifp->if_ioctl)(ifp, SIOCDELMULTI,
(caddr_t)&ifr);
}
}
}
#ifdef notyet
bzero((caddr_t)qtable, sizeof(qtable));
bzero((caddr_t)tbftable, sizeof(tbftable));
#endif
bzero((caddr_t)mif6table, sizeof(mif6table));
nummifs = 0;
pim6 = 0; /* used to stub out/in pim specific code */
callout_stop(&expire_upcalls_ch);
/*
* Free all multicast forwarding cache entries.
*/
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_free(rte->m);
free(rte, M_MRTABLE);
rte = n;
}
frt = rt;
rt = rt->mf6c_next;
free(frt, M_MRTABLE);
}
}
bzero((caddr_t)mf6ctable, sizeof(mf6ctable));
/*
* Reset de-encapsulation cache
*/
reg_mif_num = -1;
ip6_mrouter = NULL;
ip6_mrouter_ver = 0;
splx(s);
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG, "ip6_mrouter_done\n");
#endif
return 0;
}
static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
/*
* Add a mif to the mif table
*/
static int
add_m6if(mifcp)
struct mif6ctl *mifcp;
{
struct mif6 *mifp;
struct ifnet *ifp;
struct in6_ifreq ifr;
int error, s;
#ifdef notyet
struct tbf *m_tbf = tbftable + mifcp->mif6c_mifi;
#endif
if (mifcp->mif6c_mifi >= MAXMIFS)
return EINVAL;
mifp = mif6table + mifcp->mif6c_mifi;
if (mifp->m6_ifp)
return EADDRINUSE; /* XXX: is it appropriate? */
if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > if_index)
return ENXIO;
/*
* XXX: some OSes can remove ifp and clear ifindex2ifnet[id]
* even for id between 0 and if_index.
*/
if ((ifp = ifindex2ifnet[mifcp->mif6c_pifi]) == NULL)
return ENXIO;
if (mifcp->mif6c_flags & MIFF_REGISTER) {
if (reg_mif_num == (mifi_t)-1) {
strcpy(multicast_register_if.if_xname,
"register_mif"); /* XXX */
multicast_register_if.if_flags |= IFF_LOOPBACK;
multicast_register_if.if_index = mifcp->mif6c_mifi;
reg_mif_num = mifcp->mif6c_mifi;
}
ifp = &multicast_register_if;
} /* if REGISTER */
else {
/* Make sure the interface supports multicast */
if ((ifp->if_flags & IFF_MULTICAST) == 0)
return EOPNOTSUPP;
s = splsoftnet();
/*
* Enable promiscuous reception of all IPv6 multicasts
* from the interface.
*/
ifr.ifr_addr.sin6_family = AF_INET6;
ifr.ifr_addr.sin6_addr = in6addr_any;
error = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, (caddr_t)&ifr);
splx(s);
if (error)
return error;
}
s = splsoftnet();
mifp->m6_flags = mifcp->mif6c_flags;
mifp->m6_ifp = ifp;
#ifdef notyet
/* scaling up here allows division by 1024 in critical code */
mifp->m6_rate_limit = mifcp->mif6c_rate_limit * 1024 / 1000;
#endif
/* 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;
splx(s);
/* Adjust nummifs up if the mifi is higher than nummifs */
if (nummifs <= mifcp->mif6c_mifi)
nummifs = mifcp->mif6c_mifi + 1;
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG,
"add_mif #%d, phyint %s%d\n",
mifcp->mif6c_mifi,
ifp->if_name, ifp->if_unit);
#endif
return 0;
}
/*
* Delete a mif from the mif table
*/
static int
del_m6if(mifip)
mifi_t *mifip;
{
struct mif6 *mifp = mif6table + *mifip;
mifi_t mifi;
struct ifnet *ifp;
struct in6_ifreq ifr;
int s;
if (*mifip >= nummifs)
return EINVAL;
if (mifp->m6_ifp == NULL)
return EINVAL;
s = splsoftnet();
if (!(mifp->m6_flags & MIFF_REGISTER)) {
/*
* XXX: what if there is yet IPv4 multicast daemon
* using the interface?
*/
ifp = mifp->m6_ifp;
ifr.ifr_addr.sin6_family = AF_INET6;
ifr.ifr_addr.sin6_addr = in6addr_any;
(*ifp->if_ioctl)(ifp, SIOCDELMULTI, (caddr_t)&ifr);
}
#ifdef notyet
bzero((caddr_t)qtable[*mifip], sizeof(qtable[*mifip]));
bzero((caddr_t)mifp->m6_tbf, sizeof(*(mifp->m6_tbf)));
#endif
bzero((caddr_t)mifp, sizeof (*mifp));
/* Adjust nummifs down */
for (mifi = nummifs; mifi > 0; mifi--)
if (mif6table[mifi - 1].m6_ifp)
break;
nummifs = mifi;
splx(s);
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs);
#endif
return 0;
}
/*
* Add an mfc entry
*/
static int
add_m6fc(mfccp)
struct mf6cctl *mfccp;
{
struct mf6c *rt;
u_long hash;
struct rtdetq *rte;
u_short nstl;
int s;
MF6CFIND(mfccp->mf6cc_origin.sin6_addr,
mfccp->mf6cc_mcastgrp.sin6_addr, rt);
/* If an entry already exists, just update the fields */
if (rt) {
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_MFC)
log(LOG_DEBUG,"add_m6fc update o %s g %s p %x\n",
ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent);
#endif
s = splsoftnet();
rt->mf6c_parent = mfccp->mf6cc_parent;
rt->mf6c_ifset = mfccp->mf6cc_ifset;
splx(s);
return 0;
}
/*
* Find the entry for which the upcall was made and update
*/
s = splsoftnet();
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(&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent, rt->mf6c_stall);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_MFC)
log(LOG_DEBUG,
"add_m6fc o %s g %s p %x dbg %x\n",
ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent, rt->mf6c_stall);
#endif
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_MRTABLE);
rte = n;
}
rt->mf6c_stall = NULL;
}
}
/*
* It is possible that an entry is being inserted without an upcall
*/
if (nstl == 0) {
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_MFC)
log(LOG_DEBUG,
"add_mfc no upcall h %d o %s g %s p %x\n",
hash,
ip6_sprintf(&mfccp->mf6cc_origin.sin6_addr),
ip6_sprintf(&mfccp->mf6cc_mcastgrp.sin6_addr),
mfccp->mf6cc_parent);
#endif
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_MRTABLE,
M_NOWAIT);
if (rt == NULL) {
splx(s);
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;
}
}
splx(s);
return 0;
}
#ifdef UPCALL_TIMING
/*
* collect delay statistics on the upcalls
*/
static void
collate(t)
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(mfccp)
struct mf6cctl *mfccp;
{
struct sockaddr_in6 origin;
struct sockaddr_in6 mcastgrp;
struct mf6c *rt;
struct mf6c **nptr;
u_long hash;
int s;
origin = mfccp->mf6cc_origin;
mcastgrp = mfccp->mf6cc_mcastgrp;
hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_MFC)
log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n",
ip6_sprintf(&origin.sin6_addr),
ip6_sprintf(&mcastgrp.sin6_addr));
#endif
s = splsoftnet();
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) {
splx(s);
return EADDRNOTAVAIL;
}
*nptr = rt->mf6c_next;
free(rt, M_MRTABLE);
splx(s);
return 0;
}
static int
socket_send(s, mm, src)
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.
*/
int
ip6_mforward(ip6, ifp, m)
struct ip6_hdr *ip6;
struct ifnet *ifp;
struct mbuf *m;
{
struct mf6c *rt;
struct mif6 *mifp;
struct mbuf *mm;
int s;
mifi_t mifi;
long time_second = time.tv_sec;
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_FORWARD)
log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n",
ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst),
ifp->if_index);
#endif
/*
* 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_NODELOCAL(&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.ip6s_cantforward++;
if (ip6_log_time + ip6_log_interval < time_second) {
ip6_log_time = time_second;
log(LOG_DEBUG,
"cannot forward "
"from %s to %s nxt %d received on %s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
ip6->ip6_nxt,
m->m_pkthdr.rcvif ?
if_name(m->m_pkthdr.rcvif) : "?");
}
return 0;
}
/*
* Determine forwarding mifs from the forwarding cache table
*/
s = splsoftnet();
MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt);
/* Entry exists, so forward if necessary */
if (rt) {
splx(s);
return (ip6_mdq(m, ifp, rt));
} else {
/*
* If we don't have a route for packet's origin,
* Make a copy of the packet &
* send message to routing daemon
*/
struct mbuf *mb0;
struct rtdetq *rte;
u_long hash;
/* int i, npkts;*/
#ifdef UPCALL_TIMING
struct timeval tp;
GET_TIME(tp);
#endif /* UPCALL_TIMING */
mrt6stat.mrt6s_no_route++;
#ifdef MRT6DEBUG
if (mrt6debug & (DEBUG_FORWARD | DEBUG_MFC))
log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst));
#endif
/*
* 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_MRTABLE,
M_NOWAIT);
if (rte == NULL) {
splx(s);
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_READONLY(mb0) || mb0->m_len < sizeof(struct ip6_hdr)))
mb0 = m_pullup(mb0, sizeof(struct ip6_hdr));
if (mb0 == NULL) {
free(rte, M_MRTABLE);
splx(s);
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;
struct omrt6msg *oim;
/* no upcall, so make a new entry */
rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE,
M_NOWAIT);
if (rt == NULL) {
free(rte, M_MRTABLE);
m_freem(mb0);
splx(s);
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_MRTABLE);
m_freem(mb0);
free(rt, M_MRTABLE);
splx(s);
return ENOBUFS;
}
/*
* Send message to routing daemon
*/
sin6.sin6_addr = ip6->ip6_src;
im = NULL;
oim = NULL;
switch (ip6_mrouter_ver) {
case MRT6_OINIT:
oim = mtod(mm, struct omrt6msg *);
oim->im6_msgtype = MRT6MSG_NOCACHE;
oim->im6_mbz = 0;
break;
case MRT6_INIT:
im = mtod(mm, struct mrt6msg *);
im->im6_msgtype = MRT6MSG_NOCACHE;
im->im6_mbz = 0;
break;
default:
free(rte, M_MRTABLE);
m_freem(mb0);
free(rt, M_MRTABLE);
splx(s);
return EINVAL;
}
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_FORWARD)
log(LOG_DEBUG,
"getting the iif info in the kernel\n");
#endif
for (mifp = mif6table, mifi = 0;
mifi < nummifs && mifp->m6_ifp != ifp;
mifp++, mifi++)
;
switch (ip6_mrouter_ver) {
case MRT6_OINIT:
oim->im6_mif = mifi;
break;
case MRT6_INIT:
im->im6_mif = mifi;
break;
}
if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
log(LOG_WARNING, "ip6_mforward: ip6_mrouter "
"socket queue full\n");
mrt6stat.mrt6s_upq_sockfull++;
free(rte, M_MRTABLE);
m_freem(mb0);
free(rt, M_MRTABLE);
splx(s);
return ENOBUFS;
}
mrt6stat.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.mrt6s_upq_ovflw++;
free(rte, M_MRTABLE);
m_freem(mb0);
splx(s);
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 */
splx(s);
return 0;
}
}
/*
* Clean up cache entries if upcalls are not serviced
* Call from the Slow Timeout mechanism, every half second.
*/
static void
expire_upcalls(unused)
void *unused;
{
struct rtdetq *rte;
struct mf6c *mfc, **nptr;
int i;
int s;
s = splsoftnet();
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) {
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_EXPIRE)
log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n",
ip6_sprintf(&mfc->mf6c_origin.sin6_addr),
ip6_sprintf(&mfc->mf6c_mcastgrp.sin6_addr));
#endif
/*
* 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_MRTABLE);
rte = n;
} while (rte != NULL);
mrt6stat.mrt6s_cache_cleanups++;
n6expire[i]--;
*nptr = mfc->mf6c_next;
free(mfc, M_MRTABLE);
} else {
nptr = &mfc->mf6c_next;
}
}
}
splx(s);
callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT,
expire_upcalls, NULL);
}
/*
* Packet forwarding routine once entry in the cache is made
*/
static int
ip6_mdq(m, ifp, rt)
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;
/*
* 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 */
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_FORWARD)
log(LOG_DEBUG,
"wrong if: ifid %d mifi %d mififid %x\n",
ifp->if_index, mifi,
mif6table[mifi].m6_ifp->if_index);
#endif
mrt6stat.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 (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;
struct omrt6msg *oim;
mm = m_copy(m, 0, sizeof(struct ip6_hdr));
if (mm &&
(M_READONLY(mm) ||
mm->m_len < sizeof(struct ip6_hdr)))
mm = m_pullup(mm, sizeof(struct ip6_hdr));
if (mm == NULL)
return ENOBUFS;
oim = NULL;
im = NULL;
switch (ip6_mrouter_ver) {
case MRT6_OINIT:
oim = mtod(mm, struct omrt6msg *);
oim->im6_msgtype = MRT6MSG_WRONGMIF;
oim->im6_mbz = 0;
break;
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 (ip6_mrouter_ver) {
case MRT6_OINIT:
oim->im6_mif = iif;
sin6.sin6_addr = oim->im6_src;
break;
case MRT6_INIT:
im->im6_mif = iif;
sin6.sin6_addr = im->im6_src;
break;
}
mrt6stat.mrt6s_upcalls++;
if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n");
#endif
++mrt6stat.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.
*/
for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++)
if (IF_ISSET(mifi, &rt->mf6c_ifset)) {
#ifdef notyet
/*
* 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) == 0 &&
(mif6table[mifi].m6_flags & MIFF_REGISTER) == 0 &&
(in6_addr2scopeid(ifp, &ip6->ip6_dst) !=
in6_addr2scopeid(mif6table[mifi].m6_ifp,
&ip6->ip6_dst) ||
in6_addr2scopeid(ifp, &ip6->ip6_src) !=
in6_addr2scopeid(mif6table[mifi].m6_ifp,
&ip6->ip6_src))) {
ip6stat.ip6s_badscope++;
continue;
}
#endif
mifp->m6_pkt_out++;
mifp->m6_bytes_out += plen;
MC6_SEND(ip6, mifp, m);
}
return 0;
}
static void
phyint_send(ip6, mifp, m)
struct ip6_hdr *ip6;
struct mif6 *mifp;
struct mbuf *m;
{
struct mbuf *mb_copy;
struct ifnet *ifp = mifp->m6_ifp;
int error = 0;
int s = splsoftnet();
static struct route_in6 ro;
struct in6_multi *in6m;
struct sockaddr_in6 *dst6;
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_READONLY(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr)))
mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr));
if (mb_copy == NULL) {
splx(s);
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, &ro,
IPV6_FORWARDING, &im6o, NULL);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_XMIT)
log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
mifp - mif6table, error);
#endif
splx(s);
return;
}
/*
* If we belong to the destination multicast group
* on the outgoing interface, loop back a copy.
*/
dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m);
if (in6m != NULL) {
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->sin6_family = AF_INET6;
dst6->sin6_addr = ip6->ip6_dst;
ip6_mloopback(ifp, m, (struct sockaddr_in6 *)&ro.ro_dst);
}
/*
* 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) {
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->sin6_family = AF_INET6;
dst6->sin6_addr = ip6->ip6_dst;
/*
* We just call if_output instead of nd6_output here, since
* we need no ND for a multicast forwarded packet...right?
*/
error = (*ifp->if_output)(ifp, mb_copy,
(struct sockaddr *)&ro.ro_dst, NULL);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_XMIT)
log(LOG_DEBUG, "phyint_send on mif %d err %d\n",
mifp - mif6table, error);
#endif
} else {
#ifdef MULTICAST_PMTUD
icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu);
#else
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_XMIT)
log(LOG_DEBUG,
"phyint_send: packet too big on %s o %s g %s"
" size %d(discarded)\n",
if_name(ifp),
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst),
mb_copy->m_pkthdr.len);
#endif /* MRT6DEBUG */
m_freem(mb_copy); /* simply discard the packet */
#endif
}
splx(s);
}
static int
register_send(ip6, mif, m)
struct ip6_hdr *ip6;
struct mif6 *mif;
struct mbuf *m;
{
struct mbuf *mm;
int i, len = m->m_pkthdr.len;
static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 };
struct mrt6msg *im6;
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n",
ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&ip6->ip6_dst));
#endif
++pim6stat.pim6s_snd_registers;
/* Make a copy of the packet to send to the user level process */
MGETHDR(mm, M_DONTWAIT, MT_HEADER);
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.mrt6s_upcalls++;
if (socket_send(ip6_mrouter, mm, &sin6) < 0) {
#ifdef MRT6DEBUG
if (mrt6debug)
log(LOG_WARNING,
"register_send: ip6_mrouter socket queue full\n");
#endif
++mrt6stat.mrt6s_upq_sockfull;
return ENOBUFS;
}
return 0;
}
/*
* 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(mp, offp, proto)
struct mbuf **mp;
int *offp, 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.pim6s_rcv_total;
ip6 = mtod(m, struct ip6_hdr *);
pimlen = m->m_pkthdr.len - *offp;
/*
* Validate lengths
*/
if (pimlen < PIM_MINLEN) {
++pim6stat.pim6s_rcv_tooshort;
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM)
log(LOG_DEBUG,"pim6_input: PIM packet too short\n");
#endif
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.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.pim6s_rcv_badsum;
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM)
log(LOG_DEBUG,
"pim6_input: invalid checksum\n");
#endif
m_freem(m);
return (IPPROTO_DONE);
}
}
#endif /* PIM_CHECKSUM */
/* PIM version check */
if (pim->pim_ver != PIM_VERSION) {
++pim6stat.pim6s_rcv_badversion;
#ifdef MRT6DEBUG
log(LOG_ERR,
"pim6_input: incorrect version %d, expecting %d\n",
pim->pim_ver, PIM_VERSION);
#endif
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;
++pim6stat.pim6s_rcv_registers;
if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) {
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM)
log(LOG_DEBUG,
"pim6_input: register mif not set: %d\n",
reg_mif_num);
#endif
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.pim6s_rcv_tooshort;
++pim6stat.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
log(LOG_ERR,
"pim6_input: register packet size too "
"small %d from %s\n",
pimlen, ip6_sprintf(&ip6->ip6_src));
#endif
m_freem(m);
return (IPPROTO_DONE);
}
eip6 = (struct ip6_hdr *) (reghdr + 1);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM)
log(LOG_DEBUG,
"pim6_input[register], eip6: %s -> %s, "
"eip6 plen %d\n",
ip6_sprintf(&eip6->ip6_src),
ip6_sprintf(&eip6->ip6_dst),
ntohs(eip6->ip6_plen));
#endif
/* verify the version number of the inner packet */
if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
++pim6stat.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
log(LOG_DEBUG, "pim6_input: invalid IP version (%d) "
"of the inner packet\n",
(eip6->ip6_vfc & IPV6_VERSION));
#endif
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.pim6s_rcv_badregisters;
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM)
log(LOG_DEBUG,
"pim6_input: inner packet of register "
"is not multicast %s\n",
ip6_sprintf(&eip6->ip6_dst));
#endif
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) {
#ifdef MRT6DEBUG
log(LOG_ERR,
"pim6_input: pim register: "
"could not copy register head\n");
#endif
m_freem(m);
return (IPPROTO_DONE);
}
/*
* forward the inner ip6 packet; point m_data at the inner ip6.
*/
m_adj(m, off + PIM_MINLEN);
#ifdef MRT6DEBUG
if (mrt6debug & DEBUG_PIM) {
log(LOG_DEBUG,
"pim6_input: forwarding decapsulated register: "
"src %s, dst %s, mif %d\n",
ip6_sprintf(&eip6->ip6_src),
ip6_sprintf(&eip6->ip6_dst),
reg_mif_num);
}
#endif
rc = looutput(mif6table[reg_mif_num].m6_ifp, m,
(struct sockaddr *) &dst,
(struct rtentry *) NULL);
/* 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);
}
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