1950 lines
49 KiB
C
1950 lines
49 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $
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*/
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/*-
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* Copyright (c) 1989 Stephen Deering
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Stephen Deering of Stanford University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93
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* BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp
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*/
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/*
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* IP multicast forwarding procedures
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*
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* Written by David Waitzman, BBN Labs, August 1988.
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* Modified by Steve Deering, Stanford, February 1989.
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* Modified by Mark J. Steiglitz, Stanford, May, 1991
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* Modified by Van Jacobson, LBL, January 1993
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* Modified by Ajit Thyagarajan, PARC, August 1993
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* Modified by Bill Fenner, PARC, April 1994
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*
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* MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/callout.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/sdt.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sockio.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_types.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/icmp6.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip6.h>
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#include <netinet/in_kdtrace.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#include <netinet6/nd6.h>
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#include <netinet6/ip6_mroute.h>
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#include <netinet6/pim6.h>
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#include <netinet6/pim6_var.h>
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static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry");
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static int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *);
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static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
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static int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *);
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static int set_pim6(int *);
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static int socket_send(struct socket *, struct mbuf *,
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struct sockaddr_in6 *);
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extern int in6_mcast_loop;
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extern struct domain inet6domain;
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static const struct encaptab *pim6_encap_cookie;
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static int pim6_encapcheck(const struct mbuf *, int, int, void *);
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static int pim6_input(struct mbuf *, int, int, void *);
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static const struct encap_config ipv6_encap_cfg = {
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.proto = IPPROTO_PIM,
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.min_length = sizeof(struct ip6_hdr) + PIM_MINLEN,
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.exact_match = 8,
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.check = pim6_encapcheck,
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.input = pim6_input
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};
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VNET_DEFINE_STATIC(int, ip6_mrouter_ver) = 0;
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#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver)
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SYSCTL_DECL(_net_inet6);
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SYSCTL_DECL(_net_inet6_ip6);
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static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim,
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CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
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"PIM");
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static struct mrt6stat mrt6stat;
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SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW,
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&mrt6stat, mrt6stat,
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"Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)");
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#define MRT6STAT_INC(name) mrt6stat.name += 1
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#define NO_RTE_FOUND 0x1
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#define RTE_FOUND 0x2
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static struct mtx mrouter6_mtx;
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#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx)
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#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx)
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#define MROUTER6_LOCK_ASSERT() do { \
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mtx_assert(&mrouter6_mtx, MA_OWNED); \
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NET_ASSERT_GIANT(); \
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} while (0)
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#define MROUTER6_LOCK_INIT() \
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mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF)
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#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx)
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static struct mf6c *mf6ctable[MF6CTBLSIZ];
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SYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD,
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&mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]",
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"IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], "
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"netinet6/ip6_mroute.h)");
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static struct mtx mfc6_mtx;
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#define MFC6_LOCK() mtx_lock(&mfc6_mtx)
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#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx)
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#define MFC6_LOCK_ASSERT() do { \
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mtx_assert(&mfc6_mtx, MA_OWNED); \
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NET_ASSERT_GIANT(); \
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} while (0)
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#define MFC6_LOCK_INIT() \
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mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF)
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#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx)
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static u_char n6expire[MF6CTBLSIZ];
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static struct mif6 mif6table[MAXMIFS];
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static int
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sysctl_mif6table(SYSCTL_HANDLER_ARGS)
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{
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struct mif6_sctl *out;
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int error;
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out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP,
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M_WAITOK | M_ZERO);
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for (int i = 0; i < MAXMIFS; i++) {
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out[i].m6_flags = mif6table[i].m6_flags;
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out[i].m6_rate_limit = mif6table[i].m6_rate_limit;
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out[i].m6_lcl_addr = mif6table[i].m6_lcl_addr;
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if (mif6table[i].m6_ifp != NULL)
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out[i].m6_ifp = mif6table[i].m6_ifp->if_index;
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else
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out[i].m6_ifp = 0;
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out[i].m6_pkt_in = mif6table[i].m6_pkt_in;
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out[i].m6_pkt_out = mif6table[i].m6_pkt_out;
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out[i].m6_bytes_in = mif6table[i].m6_bytes_in;
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out[i].m6_bytes_out = mif6table[i].m6_bytes_out;
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}
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error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS);
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free(out, M_TEMP);
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return (error);
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}
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SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table,
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CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
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NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]",
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"IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], "
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"netinet6/ip6_mroute.h)");
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static struct mtx mif6_mtx;
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#define MIF6_LOCK() mtx_lock(&mif6_mtx)
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#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx)
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#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED)
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#define MIF6_LOCK_INIT() \
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mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF)
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#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx)
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#ifdef MRT6DEBUG
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VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */
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#define V_mrt6debug VNET(mrt6debug)
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#define DEBUG_MFC 0x02
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#define DEBUG_FORWARD 0x04
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#define DEBUG_EXPIRE 0x08
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#define DEBUG_XMIT 0x10
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#define DEBUG_REG 0x20
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#define DEBUG_PIM 0x40
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#define DEBUG_ERR 0x80
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#define DEBUG_ANY 0x7f
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#define MRT6_DLOG(m, fmt, ...) \
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if (V_mrt6debug & (m)) \
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log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \
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"%s: " fmt "\n", __func__, ##__VA_ARGS__)
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#else
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#define MRT6_DLOG(m, fmt, ...)
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#endif
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static void expire_upcalls(void *);
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#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */
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#define UPCALL_EXPIRE 6 /* number of timeouts */
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/*
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* XXX TODO: maintain a count to if_allmulti() calls in struct ifnet.
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*/
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/*
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* 'Interfaces' associated with decapsulator (so we can tell
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* packets that went through it from ones that get reflected
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* by a broken gateway). Different from IPv4 register_if,
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* these interfaces are linked into the system ifnet list,
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* because per-interface IPv6 statistics are maintained in
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* ifp->if_afdata. But it does not have any routes point
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* to them. I.e., packets can't be sent this way. They
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* only exist as a placeholder for multicast source
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* verification.
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*/
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static struct ifnet *multicast_register_if6;
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#define ENCAP_HOPS 64
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/*
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* Private variables.
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*/
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static mifi_t nummifs = 0;
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static mifi_t reg_mif_num = (mifi_t)-1;
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static struct pim6stat pim6stat;
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SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW,
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&pim6stat, pim6stat,
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"PIM Statistics (struct pim6stat, netinet6/pim6_var.h)");
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#define PIM6STAT_INC(name) pim6stat.name += 1
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VNET_DEFINE_STATIC(int, pim6);
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#define V_pim6 VNET(pim6)
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/*
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* Hash function for a source, group entry
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*/
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#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \
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(a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \
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(g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \
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(g).s6_addr32[2] ^ (g).s6_addr32[3])
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/*
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* Find a route for a given origin IPv6 address and Multicast group address.
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*/
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#define MF6CFIND(o, g, rt) do { \
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struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \
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rt = NULL; \
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while (_rt) { \
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if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \
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IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \
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(_rt->mf6c_stall == NULL)) { \
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rt = _rt; \
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break; \
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} \
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_rt = _rt->mf6c_next; \
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} \
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if (rt == NULL) { \
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MRT6STAT_INC(mrt6s_mfc_misses); \
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} \
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} while (/*CONSTCOND*/ 0)
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/*
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* Macros to compute elapsed time efficiently
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* Borrowed from Van Jacobson's scheduling code
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* XXX: replace with timersub() ?
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*/
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#define TV_DELTA(a, b, delta) do { \
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int xxs; \
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\
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delta = (a).tv_usec - (b).tv_usec; \
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if ((xxs = (a).tv_sec - (b).tv_sec)) { \
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switch (xxs) { \
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case 2: \
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delta += 1000000; \
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/* FALLTHROUGH */ \
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case 1: \
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delta += 1000000; \
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break; \
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default: \
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delta += (1000000 * xxs); \
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} \
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} \
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} while (/*CONSTCOND*/ 0)
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/* XXX: replace with timercmp(a, b, <) ? */
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#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \
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(a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec)
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#ifdef UPCALL_TIMING
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#define UPCALL_MAX 50
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static u_long upcall_data[UPCALL_MAX + 1];
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static void collate();
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#endif /* UPCALL_TIMING */
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static int ip6_mrouter_init(struct socket *, int, int);
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static int add_m6fc(struct mf6cctl *);
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static int add_m6if(struct mif6ctl *);
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static int del_m6fc(struct mf6cctl *);
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static int del_m6if(mifi_t *);
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static int del_m6if_locked(mifi_t *);
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static int get_mif6_cnt(struct sioc_mif_req6 *);
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static int get_sg_cnt(struct sioc_sg_req6 *);
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static struct callout expire_upcalls_ch;
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int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
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int X_ip6_mrouter_done(void);
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int X_ip6_mrouter_set(struct socket *, struct sockopt *);
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int X_ip6_mrouter_get(struct socket *, struct sockopt *);
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int X_mrt6_ioctl(u_long, caddr_t);
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/*
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* Handle MRT setsockopt commands to modify the multicast routing tables.
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*/
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int
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X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt)
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{
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int error = 0;
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int optval;
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struct mif6ctl mifc;
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struct mf6cctl mfcc;
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mifi_t mifi;
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if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT)
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return (EPERM);
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switch (sopt->sopt_name) {
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case MRT6_INIT:
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#ifdef MRT6_OINIT
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case MRT6_OINIT:
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#endif
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error = sooptcopyin(sopt, &optval, sizeof(optval),
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sizeof(optval));
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if (error)
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break;
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error = ip6_mrouter_init(so, optval, sopt->sopt_name);
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break;
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case MRT6_DONE:
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error = X_ip6_mrouter_done();
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break;
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case MRT6_ADD_MIF:
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error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc));
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if (error)
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break;
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error = add_m6if(&mifc);
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break;
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case MRT6_ADD_MFC:
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error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
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if (error)
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break;
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error = add_m6fc(&mfcc);
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break;
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case MRT6_DEL_MFC:
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error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc));
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if (error)
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break;
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error = del_m6fc(&mfcc);
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break;
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case MRT6_DEL_MIF:
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error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi));
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if (error)
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break;
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error = del_m6if(&mifi);
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break;
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case MRT6_PIM:
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error = sooptcopyin(sopt, &optval, sizeof(optval),
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sizeof(optval));
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if (error)
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break;
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error = set_pim6(&optval);
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break;
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default:
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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_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();
|
|
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;
|
|
|
|
/*
|
|
* 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);
|