version 1.1.2.3, 1999/11/30 13:35:58 |
version 1.37.2.3, 2007/10/09 13:44:56 |
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/* $NetBSD$ */ |
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/* $KAME: mld6.c,v 1.25 2001/01/16 14:14:18 itojun Exp $ */ |
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/* |
/* |
* Copyright (C) 1998 WIDE Project. |
* Copyright (C) 1998 WIDE Project. |
* All rights reserved. |
* All rights reserved. |
* |
* |
* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* modification, are permitted provided that the following conditions |
* are met: |
* are met: |
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* 3. Neither the name of the project nor the names of its contributors |
* 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 |
* may be used to endorse or promote products derived from this software |
* without specific prior written permission. |
* without specific prior written permission. |
* |
* |
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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*/ |
*/ |
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/* |
/* |
* Copyright (c) 1988 Stephen Deering. |
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* Copyright (c) 1992, 1993 |
* Copyright (c) 1992, 1993 |
* The Regents of the University of California. All rights reserved. |
* The Regents of the University of California. All rights reserved. |
* |
* |
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* 2. Redistributions in binary form must reproduce the above copyright |
* 2. Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* 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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* @(#)igmp.c 8.1 (Berkeley) 7/19/93 |
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*/ |
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/* |
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* Copyright (c) 1988 Stephen Deering. |
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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. |
* 3. All advertising materials mentioning features or use of this software |
* 3. All advertising materials mentioning features or use of this software |
* must display the following acknowledgement: |
* must display the following acknowledgement: |
* This product includes software developed by the University of |
* This product includes software developed by the University of |
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* @(#)igmp.c 8.1 (Berkeley) 7/19/93 |
* @(#)igmp.c 8.1 (Berkeley) 7/19/93 |
*/ |
*/ |
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#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) |
#include <sys/cdefs.h> |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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#include "opt_inet.h" |
#include "opt_inet.h" |
#ifdef __NetBSD__ /*XXX*/ |
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#include "opt_ipsec.h" |
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#endif |
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#endif |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
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#include <sys/socket.h> |
#include <sys/socket.h> |
#include <sys/protosw.h> |
#include <sys/protosw.h> |
#include <sys/syslog.h> |
#include <sys/syslog.h> |
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#include <sys/sysctl.h> |
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#include <sys/kernel.h> |
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#include <sys/callout.h> |
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#include <net/if.h> |
#include <net/if.h> |
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#include <netinet/in.h> |
#include <netinet/in.h> |
#include <netinet/in_var.h> |
#include <netinet/in_var.h> |
#include <netinet6/ip6.h> |
#include <netinet6/in6_var.h> |
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#include <netinet/ip6.h> |
#include <netinet6/ip6_var.h> |
#include <netinet6/ip6_var.h> |
#include <netinet6/icmp6.h> |
#include <netinet6/scope6_var.h> |
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#include <netinet/icmp6.h> |
#include <netinet6/mld6_var.h> |
#include <netinet6/mld6_var.h> |
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#include <net/net_osdep.h> |
#include <net/net_osdep.h> |
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/* |
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* This structure is used to keep track of in6_multi chains which belong to |
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* deleted interface addresses. |
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*/ |
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static LIST_HEAD(, multi6_kludge) in6_mk; /* XXX BSS initialization */ |
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struct multi6_kludge { |
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LIST_ENTRY(multi6_kludge) mk_entry; |
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struct ifnet *mk_ifp; |
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struct in6_multihead mk_head; |
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}; |
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/* |
/* |
* Protocol constants |
* Protocol constants |
*/ |
*/ |
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/* denotes that the MLD max response delay field specifies time in milliseconds */ |
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#define MLD6_TIMER_SCALE 1000 |
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/* |
/* |
* time between repetitions of a node's initial report of interest in a |
* time between repetitions of a node's initial report of interest in a |
* multicast address(in seconds) |
* multicast address(in seconds) |
*/ |
*/ |
#define MLD6_UNSOLICITED_REPORT_INTERVAL 10 |
#define MLD_UNSOLICITED_REPORT_INTERVAL 10 |
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static struct ip6_pktopts ip6_opts; |
static struct ip6_pktopts ip6_opts; |
static int mld6_timers_are_running; |
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/* XXX: These are necessary for KAME's link-local hack */ |
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static struct in6_addr mld6_all_nodes_linklocal = IN6ADDR_LINKLOCAL_ALLNODES_INIT; |
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static struct in6_addr mld6_all_routers_linklocal = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; |
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static void mld6_sendpkt __P((struct in6_multi *, int, const struct in6_addr *)); |
static void mld_start_listening(struct in6_multi *); |
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static void mld_stop_listening(struct in6_multi *); |
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static struct mld_hdr * mld_allocbuf(struct mbuf **, int, struct in6_multi *, |
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int); |
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static void mld_sendpkt(struct in6_multi *, int, const struct in6_addr *); |
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static void mld_starttimer(struct in6_multi *); |
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static void mld_stoptimer(struct in6_multi *); |
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static void mld_timeo(struct in6_multi *); |
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static u_long mld_timerresid(struct in6_multi *); |
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void |
void |
mld6_init() |
mld_init() |
{ |
{ |
static u_int8_t hbh_buf[8]; |
static u_int8_t hbh_buf[8]; |
struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; |
struct ip6_hbh *hbh = (struct ip6_hbh *)hbh_buf; |
u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); |
u_int16_t rtalert_code = htons((u_int16_t)IP6OPT_RTALERT_MLD); |
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mld6_timers_are_running = 0; |
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/* ip6h_nxt will be fill in later */ |
/* ip6h_nxt will be fill in later */ |
hbh->ip6h_len = 0; /* (8 >> 3) - 1*/ |
hbh->ip6h_len = 0; /* (8 >> 3) - 1 */ |
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/* XXX: grotty hard coding... */ |
/* XXX: grotty hard coding... */ |
hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ |
hbh_buf[2] = IP6OPT_PADN; /* 2 byte padding */ |
hbh_buf[3] = 0; |
hbh_buf[3] = 0; |
hbh_buf[4] = IP6OPT_RTALERT; |
hbh_buf[4] = IP6OPT_RTALERT; |
hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; |
hbh_buf[5] = IP6OPT_RTALERT_LEN - 2; |
bcopy((caddr_t)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); |
bcopy((void *)&rtalert_code, &hbh_buf[6], sizeof(u_int16_t)); |
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ip6_opts.ip6po_hbh = hbh; |
ip6_opts.ip6po_hbh = hbh; |
/* We will specify the hoplimit by a multicast option. */ |
/* We will specify the hoplimit by a multicast option. */ |
ip6_opts.ip6po_hlim = -1; |
ip6_opts.ip6po_hlim = -1; |
} |
} |
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void |
static void |
mld6_start_listening(in6m) |
mld_starttimer(struct in6_multi *in6m) |
struct in6_multi *in6m; |
{ |
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struct timeval now; |
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microtime(&now); |
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in6m->in6m_timer_expire.tv_sec = now.tv_sec + in6m->in6m_timer / hz; |
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in6m->in6m_timer_expire.tv_usec = now.tv_usec + |
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(in6m->in6m_timer % hz) * (1000000 / hz); |
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if (in6m->in6m_timer_expire.tv_usec > 1000000) { |
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in6m->in6m_timer_expire.tv_sec++; |
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in6m->in6m_timer_expire.tv_usec -= 1000000; |
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} |
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/* start or restart the timer */ |
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callout_reset(in6m->in6m_timer_ch, in6m->in6m_timer, |
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(void (*) __P((void *)))mld_timeo, in6m); |
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} |
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static void |
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mld_stoptimer(struct in6_multi *in6m) |
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{ |
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if (in6m->in6m_timer == IN6M_TIMER_UNDEF) |
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return; |
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callout_stop(in6m->in6m_timer_ch); |
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in6m->in6m_timer = IN6M_TIMER_UNDEF; |
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} |
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static void |
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mld_timeo(struct in6_multi *in6m) |
{ |
{ |
#ifdef __NetBSD__ |
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int s = splsoftnet(); |
int s = splsoftnet(); |
#else |
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int s = splnet(); |
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
#endif |
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callout_stop(in6m->in6m_timer_ch); |
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switch (in6m->in6m_state) { |
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case MLD_REPORTPENDING: |
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mld_start_listening(in6m); |
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break; |
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default: |
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mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
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break; |
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} |
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splx(s); |
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} |
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static u_long |
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mld_timerresid(struct in6_multi *in6m) |
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{ |
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struct timeval now, diff; |
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microtime(&now); |
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if (now.tv_sec > in6m->in6m_timer_expire.tv_sec || |
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(now.tv_sec == in6m->in6m_timer_expire.tv_sec && |
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now.tv_usec > in6m->in6m_timer_expire.tv_usec)) { |
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return (0); |
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} |
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diff = in6m->in6m_timer_expire; |
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diff.tv_sec -= now.tv_sec; |
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diff.tv_usec -= now.tv_usec; |
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if (diff.tv_usec < 0) { |
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diff.tv_sec--; |
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diff.tv_usec += 1000000; |
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} |
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/* return the remaining time in milliseconds */ |
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return (((u_long)(diff.tv_sec * 1000000 + diff.tv_usec)) / 1000); |
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} |
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static void |
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mld_start_listening(struct in6_multi *in6m) |
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{ |
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struct in6_addr all_in6; |
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/* |
/* |
* (draft-ietf-ipngwg-mld, page 10) |
* RFC2710 page 10: |
* The node never sends a Report or Done for the link-scope all-nodes |
* The node never sends a Report or Done for the link-scope all-nodes |
* address. |
* address. |
* MLD messages are never sent for multicast addresses whose scope is 0 |
* MLD messages are never sent for multicast addresses whose scope is 0 |
* (reserved) or 1 (node-local). |
* (reserved) or 1 (node-local). |
*/ |
*/ |
mld6_all_nodes_linklocal.s6_addr16[1] = |
all_in6 = in6addr_linklocal_allnodes; |
htons(in6m->in6m_ifp->if_index); /* XXX */ |
if (in6_setscope(&all_in6, in6m->in6m_ifp, NULL)) { |
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal) || |
/* XXX: this should not happen! */ |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) { |
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in6m->in6m_timer = 0; |
in6m->in6m_timer = 0; |
in6m->in6m_state = MLD6_OTHERLISTENER; |
in6m->in6m_state = MLD_OTHERLISTENER; |
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} |
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if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || |
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IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) { |
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in6m->in6m_timer = IN6M_TIMER_UNDEF; |
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in6m->in6m_state = MLD_OTHERLISTENER; |
} else { |
} else { |
mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL); |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
in6m->in6m_timer = MLD6_RANDOM_DELAY( |
in6m->in6m_timer = arc4random() % |
MLD6_UNSOLICITED_REPORT_INTERVAL * PR_FASTHZ); |
(MLD_UNSOLICITED_REPORT_INTERVAL * hz); |
in6m->in6m_state = MLD6_IREPORTEDLAST; |
in6m->in6m_state = MLD_IREPORTEDLAST; |
mld6_timers_are_running = 1; |
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mld_starttimer(in6m); |
} |
} |
splx(s); |
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} |
} |
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void |
static void |
mld6_stop_listening(in6m) |
mld_stop_listening(struct in6_multi *in6m) |
struct in6_multi *in6m; |
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{ |
{ |
mld6_all_nodes_linklocal.s6_addr16[1] = |
struct in6_addr allnode, allrouter; |
htons(in6m->in6m_ifp->if_index); /* XXX */ |
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mld6_all_routers_linklocal.s6_addr16[1] = |
allnode = in6addr_linklocal_allnodes; |
htons(in6m->in6m_ifp->if_index); /* XXX: necessary when mrouting */ |
if (in6_setscope(&allnode, in6m->in6m_ifp, NULL)) { |
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/* XXX: this should not happen! */ |
if (in6m->in6m_state == MLD6_IREPORTEDLAST && |
return; |
(!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &mld6_all_nodes_linklocal)) && |
} |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > IPV6_ADDR_SCOPE_NODELOCAL) |
allrouter = in6addr_linklocal_allrouters; |
mld6_sendpkt(in6m, MLD6_LISTENER_DONE, |
if (in6_setscope(&allrouter, in6m->in6m_ifp, NULL)) { |
&mld6_all_routers_linklocal); |
/* XXX impossible */ |
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return; |
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} |
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if (in6m->in6m_state == MLD_IREPORTEDLAST && |
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(!IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &allnode)) && |
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IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) > |
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IPV6_ADDR_SCOPE_INTFACELOCAL) { |
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mld_sendpkt(in6m, MLD_LISTENER_DONE, &allrouter); |
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} |
} |
} |
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void |
void |
mld6_input(m, off) |
mld_input(struct mbuf *m, int off) |
struct mbuf *m; |
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int off; |
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{ |
{ |
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
struct mld6_hdr *mldh = (struct mld6_hdr *)(mtod(m, caddr_t) + off); |
struct mld_hdr *mldh; |
struct ifnet *ifp = m->m_pkthdr.rcvif; |
struct ifnet *ifp = m->m_pkthdr.rcvif; |
struct in6_multi *in6m; |
struct in6_multi *in6m = NULL; |
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struct in6_addr mld_addr, all_in6; |
struct in6_ifaddr *ia; |
struct in6_ifaddr *ia; |
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 |
int timer = 0; /* timer value in the MLD query header */ |
struct ifmultiaddr *ifma; |
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#endif |
IP6_EXTHDR_GET(mldh, struct mld_hdr *, m, off, sizeof(*mldh)); |
int timer; /* timer value in the MLD query header */ |
if (mldh == NULL) { |
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icmp6stat.icp6s_tooshort++; |
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return; |
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} |
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/* source address validation */ |
/* source address validation */ |
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ip6 = mtod(m, struct ip6_hdr *);/* in case mpullup */ |
if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { |
if (!IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) { |
log(LOG_ERR, |
/* |
"mld6_input: src %s is not link-local\n", |
* RFC3590 allows the IPv6 unspecified address as the source |
ip6_sprintf(&ip6->ip6_src)); |
* address of MLD report and done messages. However, as this |
/* |
* same document says, this special rule is for snooping |
* spec(draft-ietf-ipngwg-mld) does not explicitly |
* switches and the RFC requires routers to discard MLD packets |
* specify to discard the packet from a non link-local |
* with the unspecified source address. The RFC only talks |
* source address. But we believe it's expected to do so. |
* about hosts receiving an MLD query or report in Security |
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* Considerations, but this is probably the correct intention. |
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* RFC3590 does not talk about other cases than link-local and |
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* the unspecified source addresses, but we believe the same |
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* rule should be applied. |
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* As a result, we only allow link-local addresses as the |
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* source address; otherwise, simply discard the packet. |
*/ |
*/ |
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#if 0 |
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/* |
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* XXX: do not log in an input path to avoid log flooding, |
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* though RFC3590 says "SHOULD log" if the source of a query |
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* is the unspecified address. |
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*/ |
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log(LOG_INFO, |
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"mld_input: src %s is not link-local (grp=%s)\n", |
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ip6_sprintf(&ip6->ip6_src), ip6_sprintf(&mldh->mld_addr)); |
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#endif |
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m_freem(m); |
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return; |
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} |
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/* |
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* make a copy for local work (in6_setscope() may modify the 1st arg) |
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*/ |
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mld_addr = mldh->mld_addr; |
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if (in6_setscope(&mld_addr, ifp, NULL)) { |
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/* XXX: this should not happen! */ |
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m_free(m); |
return; |
return; |
} |
} |
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/* |
/* |
* In the MLD6 specification, there are 3 states and a flag. |
* In the MLD specification, there are 3 states and a flag. |
* |
* |
* In Non-Listener state, we simply don't have a membership record. |
* In Non-Listener state, we simply don't have a membership record. |
* In Delaying Listener state, our timer is running (in6m->in6m_timer) |
* In Delaying Listener state, our timer is running (in6m->in6m_timer) |
* In Idle Listener state, our timer is not running (in6m->in6m_timer==0) |
* In Idle Listener state, our timer is not running |
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* (in6m->in6m_timer==IN6M_TIMER_UNDEF) |
* |
* |
* The flag is in6m->in6m_state, it is set to MLD6_OTHERLISTENER if |
* The flag is in6m->in6m_state, it is set to MLD_OTHERLISTENER if |
* we have heard a report from another member, or MLD6_IREPORTEDLAST |
* we have heard a report from another member, or MLD_IREPORTEDLAST |
* if we sent the last report. |
* if we sent the last report. |
*/ |
*/ |
switch(mldh->mld6_type) { |
switch (mldh->mld_type) { |
case MLD6_LISTENER_QUERY: |
case MLD_LISTENER_QUERY: |
if (ifp->if_flags & IFF_LOOPBACK) |
if (ifp->if_flags & IFF_LOOPBACK) |
break; |
break; |
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if (!IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) && |
if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && |
!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr)) |
!IN6_IS_ADDR_MULTICAST(&mld_addr)) |
break; /* print error or log stat? */ |
break; /* print error or log stat? */ |
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) |
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mldh->mld6_addr.s6_addr16[1] = |
all_in6 = in6addr_linklocal_allnodes; |
htons(ifp->if_index); /* XXX */ |
if (in6_setscope(&all_in6, ifp, NULL)) { |
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/* XXX: this should not happen! */ |
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break; |
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} |
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/* |
/* |
* - Start the timers in all of our membership records |
* - Start the timers in all of our membership records |
* that the query applies to for the interface on |
* that the query applies to for the interface on |
* which the query arrived excl. those that belong |
* which the query arrived excl. those that belong |
* to the "all-nodes" group (ff02::1). |
* to the "all-nodes" group (ff02::1). |
* - Restart any timer that is already running but has |
* - Restart any timer that is already running but has |
* A value longer than the requested timeout. |
* a value longer than the requested timeout. |
* - Use the value specified in the query message as |
* - Use the value specified in the query message as |
* the maximum timeout. |
* the maximum timeout. |
*/ |
*/ |
|
timer = ntohs(mldh->mld_maxdelay); |
|
|
IFP_TO_IA6(ifp, ia); |
IFP_TO_IA6(ifp, ia); |
if (ia == NULL) |
if (ia == NULL) |
break; |
break; |
|
|
/* |
LIST_FOREACH(in6m, &ia->ia6_multiaddrs, in6m_entry) { |
* XXX: System timer resolution is too low to handle Max |
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, &all_in6) || |
* Response Delay, so set 1 to the internal timer even if |
|
* the calculated value equals to zero when Max Response |
|
* Delay is positive. |
|
*/ |
|
timer = ntohs(mldh->mld6_maxdelay)*PR_FASTHZ/MLD6_TIMER_SCALE; |
|
if (timer == 0 && mldh->mld6_maxdelay) |
|
timer = 1; |
|
mld6_all_nodes_linklocal.s6_addr16[1] = |
|
htons(ifp->if_index); /* XXX */ |
|
|
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 |
|
LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) |
|
#else |
|
for (in6m = ia->ia6_multiaddrs.lh_first; |
|
in6m; |
|
in6m = in6m->in6m_entry.le_next) |
|
#endif |
|
{ |
|
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 |
|
if (ifma->ifma_addr->sa_family != AF_INET6) |
|
continue; |
|
in6m = (struct in6_multi *)ifma->ifma_protospec; |
|
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, |
|
&mld6_all_nodes_linklocal) || |
|
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < |
IPV6_ADDR_SCOPE_LINKLOCAL) |
IPV6_ADDR_SCOPE_LINKLOCAL) |
continue; |
continue; |
#else |
|
if (IN6_ARE_ADDR_EQUAL(&in6m->in6m_addr, |
if (in6m->in6m_state == MLD_REPORTPENDING) |
&mld6_all_nodes_linklocal) || |
continue; /* we are not yet ready */ |
IPV6_ADDR_MC_SCOPE(&in6m->in6m_addr) < |
|
IPV6_ADDR_SCOPE_LINKLOCAL) |
if (!IN6_IS_ADDR_UNSPECIFIED(&mld_addr) && |
|
!IN6_ARE_ADDR_EQUAL(&mld_addr, &in6m->in6m_addr)) |
continue; |
continue; |
#endif |
|
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&mldh->mld6_addr) || |
if (timer == 0) { |
IN6_ARE_ADDR_EQUAL(&mldh->mld6_addr, |
/* send a report immediately */ |
&in6m->in6m_addr)) |
mld_stoptimer(in6m); |
{ |
mld_sendpkt(in6m, MLD_LISTENER_REPORT, NULL); |
if (timer == 0) { |
in6m->in6m_state = MLD_IREPORTEDLAST; |
/* send a report immediately */ |
} else if (in6m->in6m_timer == IN6M_TIMER_UNDEF || |
mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, |
mld_timerresid(in6m) > (u_long)timer) { |
NULL); |
in6m->in6m_timer = arc4random() % |
in6m->in6m_timer = 0; /* reset timer */ |
(int)(((long)timer * hz) / 1000); |
in6m->in6m_state = MLD6_IREPORTEDLAST; |
mld_starttimer(in6m); |
} |
|
else if (in6m->in6m_timer == 0 || /*idle state*/ |
|
in6m->in6m_timer > timer) { |
|
in6m->in6m_timer = |
|
MLD6_RANDOM_DELAY(timer); |
|
mld6_timers_are_running = 1; |
|
} |
|
} |
} |
} |
} |
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) |
|
mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ |
|
break; |
break; |
case MLD6_LISTENER_REPORT: |
|
|
case MLD_LISTENER_REPORT: |
/* |
/* |
* For fast leave to work, we have to know that we are the |
* For fast leave to work, we have to know that we are the |
* last person to send a report for this group. Reports |
* last person to send a report for this group. Reports |
* can potentially get looped back if we are a multicast |
* can potentially get looped back if we are a multicast |
* router, so discard reports sourced by me. |
* router, so discard reports sourced by me. |
* Note that it is impossible to check IFF_LOOPBACK flag of |
* Note that it is impossible to check IFF_LOOPBACK flag of |
* ifp for this purpose, since ip6_mloopback pass the physical |
* ifp for this purpose, since ip6_mloopback pass the physical |
* interface to looutput. |
* interface to looutput. |
*/ |
*/ |
if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ |
if (m->m_flags & M_LOOP) /* XXX: grotty flag, but efficient */ |
break; |
break; |
|
|
if (!IN6_IS_ADDR_MULTICAST(&mldh->mld6_addr)) |
if (!IN6_IS_ADDR_MULTICAST(&mldh->mld_addr)) |
break; |
break; |
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) |
/* |
mldh->mld6_addr.s6_addr16[1] = |
* If we belong to the group being reported, stop |
htons(ifp->if_index); /* XXX */ |
* our timer for that group. |
/* |
*/ |
* If we belong to the group being reported, stop |
IN6_LOOKUP_MULTI(mld_addr, ifp, in6m); |
* our timer for that group. |
|
*/ |
|
IN6_LOOKUP_MULTI(mldh->mld6_addr, ifp, in6m); |
|
if (in6m) { |
if (in6m) { |
in6m->in6m_timer = 0; /* transit to idle state */ |
mld_stoptimer(in6m); /* transit to idle state */ |
in6m->in6m_state = MLD6_OTHERLISTENER; /* clear flag */ |
in6m->in6m_state = MLD_OTHERLISTENER; /* clear flag */ |
} |
} |
|
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) |
|
mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ |
|
break; |
break; |
default: /* this is impossible */ |
default: /* this is impossible */ |
log(LOG_ERR, "mld6_input: illegal type(%d)", mldh->mld6_type); |
#if 0 |
|
/* |
|
* this case should be impossible because of filtering in |
|
* icmp6_input(). But we explicitly disabled this part |
|
* just in case. |
|
*/ |
|
log(LOG_ERR, "mld_input: illegal type(%d)", mldh->mld_type); |
|
#endif |
break; |
break; |
} |
} |
} |
|
|
|
void |
|
mld6_fasttimeo() |
|
{ |
|
register struct in6_multi *in6m; |
|
struct in6_multistep step; |
|
int s; |
|
|
|
/* |
|
* Quick check to see if any work needs to be done, in order |
|
* to minimize the overhead of fasttimo processing. |
|
*/ |
|
if (!mld6_timers_are_running) |
|
return; |
|
|
|
#ifdef __NetBSD__ |
m_freem(m); |
s = splsoftnet(); |
|
#else |
|
s = splnet(); |
|
#endif |
|
mld6_timers_are_running = 0; |
|
IN6_FIRST_MULTI(step, in6m); |
|
while (in6m != NULL) { |
|
if (in6m->in6m_timer == 0) { |
|
/* do nothing */ |
|
} else if (--in6m->in6m_timer == 0) { |
|
mld6_sendpkt(in6m, MLD6_LISTENER_REPORT, NULL); |
|
in6m->in6m_state = MLD6_IREPORTEDLAST; |
|
} else { |
|
mld6_timers_are_running = 1; |
|
} |
|
IN6_NEXT_MULTI(step, in6m); |
|
} |
|
splx(s); |
|
} |
} |
|
|
static void |
static void |
mld6_sendpkt(in6m, type, dst) |
mld_sendpkt(struct in6_multi *in6m, int type, |
struct in6_multi *in6m; |
const struct in6_addr *dst) |
int type; |
|
const struct in6_addr *dst; |
|
{ |
{ |
struct mbuf *mh, *md; |
struct mbuf *mh; |
struct mld6_hdr *mldh; |
struct mld_hdr *mldh; |
struct ip6_hdr *ip6; |
struct ip6_hdr *ip6 = NULL; |
struct ip6_moptions im6o; |
struct ip6_moptions im6o; |
struct in6_ifaddr *ia; |
struct in6_ifaddr *ia = NULL; |
struct ifnet *ifp = in6m->in6m_ifp; |
struct ifnet *ifp = in6m->in6m_ifp; |
struct ifnet *outif = NULL; |
int ignflags; |
|
|
/* |
/* |
* At first, find a link local address on the outgoing interface |
* At first, find a link local address on the outgoing interface |
* to use as the source address of the MLD packet. |
* to use as the source address of the MLD packet. |
|
* We do not reject tentative addresses for MLD report to deal with |
|
* the case where we first join a link-local address. |
*/ |
*/ |
if ((ia = in6ifa_ifpforlinklocal(ifp)) == NULL) |
ignflags = (IN6_IFF_NOTREADY|IN6_IFF_ANYCAST) & ~IN6_IFF_TENTATIVE; |
|
if ((ia = in6ifa_ifpforlinklocal(ifp, ignflags)) == NULL) |
|
return; |
|
if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) |
|
ia = NULL; |
|
|
|
/* Allocate two mbufs to store IPv6 header and MLD header */ |
|
mldh = mld_allocbuf(&mh, sizeof(struct mld_hdr), in6m, type); |
|
if (mldh == NULL) |
return; |
return; |
|
|
|
/* fill src/dst here */ |
|
ip6 = mtod(mh, struct ip6_hdr *); |
|
ip6->ip6_src = ia ? ia->ia_addr.sin6_addr : in6addr_any; |
|
ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; |
|
|
|
mldh->mld_addr = in6m->in6m_addr; |
|
in6_clearscope(&mldh->mld_addr); /* XXX */ |
|
mldh->mld_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), |
|
sizeof(struct mld_hdr)); |
|
|
|
/* construct multicast option */ |
|
memset(&im6o, 0, sizeof(im6o)); |
|
im6o.im6o_multicast_ifp = ifp; |
|
im6o.im6o_multicast_hlim = 1; |
|
|
|
/* |
|
* Request loopback of the report if we are acting as a multicast |
|
* router, so that the process-level routing daemon can hear it. |
|
*/ |
|
im6o.im6o_multicast_loop = (ip6_mrouter != NULL); |
|
|
|
/* increment output statictics */ |
|
icmp6stat.icp6s_outhist[type]++; |
|
icmp6_ifstat_inc(ifp, ifs6_out_msg); |
|
switch (type) { |
|
case MLD_LISTENER_QUERY: |
|
icmp6_ifstat_inc(ifp, ifs6_out_mldquery); |
|
break; |
|
case MLD_LISTENER_REPORT: |
|
icmp6_ifstat_inc(ifp, ifs6_out_mldreport); |
|
break; |
|
case MLD_LISTENER_DONE: |
|
icmp6_ifstat_inc(ifp, ifs6_out_mlddone); |
|
break; |
|
} |
|
|
|
ip6_output(mh, &ip6_opts, NULL, ia ? 0 : IPV6_UNSPECSRC, |
|
&im6o, (struct socket *)NULL, NULL); |
|
} |
|
|
|
static struct mld_hdr * |
|
mld_allocbuf(struct mbuf **mh, int len, struct in6_multi *in6m, |
|
int type) |
|
{ |
|
struct mbuf *md; |
|
struct mld_hdr *mldh; |
|
struct ip6_hdr *ip6; |
|
|
/* |
/* |
* Allocate mbufs to store ip6 header and MLD header. |
* Allocate mbufs to store ip6 header and MLD header. |
* We allocate 2 mbufs and make chain in advance because |
* We allocate 2 mbufs and make chain in advance because |
* it is more convenient when inserting the hop-by-hop option later. |
* it is more convenient when inserting the hop-by-hop option later. |
*/ |
*/ |
MGETHDR(mh, M_DONTWAIT, MT_HEADER); |
MGETHDR(*mh, M_DONTWAIT, MT_HEADER); |
if (mh == NULL) |
if (*mh == NULL) |
return; |
return NULL; |
MGET(md, M_DONTWAIT, MT_DATA); |
MGET(md, M_DONTWAIT, MT_DATA); |
if (md == NULL) { |
if (md == NULL) { |
m_free(mh); |
m_free(*mh); |
return; |
*mh = NULL; |
|
return NULL; |
} |
} |
mh->m_next = md; |
(*mh)->m_next = md; |
|
md->m_next = NULL; |
|
|
#ifdef IPSEC |
(*mh)->m_pkthdr.rcvif = NULL; |
#ifndef __OpenBSD__ /*KAME IPSEC*/ |
(*mh)->m_pkthdr.len = sizeof(struct ip6_hdr) + len; |
mh->m_pkthdr.rcvif = NULL; |
(*mh)->m_len = sizeof(struct ip6_hdr); |
#endif |
MH_ALIGN(*mh, sizeof(struct ip6_hdr)); |
#endif |
|
mh->m_pkthdr.len = sizeof(struct ip6_hdr) + sizeof(struct mld6_hdr); |
|
mh->m_len = sizeof(struct ip6_hdr); |
|
MH_ALIGN(mh, sizeof(struct ip6_hdr)); |
|
|
|
/* fill in the ip6 header */ |
/* fill in the ip6 header */ |
ip6 = mtod(mh, struct ip6_hdr *); |
ip6 = mtod(*mh, struct ip6_hdr *); |
|
memset(ip6, 0, sizeof(*ip6)); |
ip6->ip6_flow = 0; |
ip6->ip6_flow = 0; |
ip6->ip6_vfc = IPV6_VERSION; |
ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
|
ip6->ip6_vfc |= IPV6_VERSION; |
/* ip6_plen will be set later */ |
/* ip6_plen will be set later */ |
ip6->ip6_nxt = IPPROTO_ICMPV6; |
ip6->ip6_nxt = IPPROTO_ICMPV6; |
/* ip6_hlim will be set by im6o.im6o_multicast_hlim */ |
/* ip6_hlim will be set by im6o.im6o_multicast_hlim */ |
ip6->ip6_src = ia->ia_addr.sin6_addr; |
/* ip6_src/dst will be set by mld_sendpkt() or mld_sendbuf() */ |
ip6->ip6_dst = dst ? *dst : in6m->in6m_addr; |
|
|
|
/* fill in the MLD header */ |
/* fill in the MLD header as much as possible */ |
md->m_len = sizeof(struct mld6_hdr); |
md->m_len = len; |
mldh = mtod(md, struct mld6_hdr *); |
mldh = mtod(md, struct mld_hdr *); |
mldh->mld6_type = type; |
memset(mldh, 0, len); |
mldh->mld6_code = 0; |
mldh->mld_type = type; |
mldh->mld6_cksum = 0; |
return mldh; |
/* XXX: we assume the function will not be called for query messages */ |
} |
mldh->mld6_maxdelay = 0; |
|
mldh->mld6_reserved = 0; |
|
mldh->mld6_addr = in6m->in6m_addr; |
|
if (IN6_IS_ADDR_MC_LINKLOCAL(&mldh->mld6_addr)) |
|
mldh->mld6_addr.s6_addr16[1] = 0; /* XXX */ |
|
mldh->mld6_cksum = in6_cksum(mh, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), |
|
sizeof(struct mld6_hdr)); |
|
|
|
/* construct multicast option */ |
/* |
bzero(&im6o, sizeof(im6o)); |
* Add an address to the list of IP6 multicast addresses for a given interface. |
im6o.im6o_multicast_ifp = ifp; |
*/ |
im6o.im6o_multicast_hlim = 1; |
struct in6_multi * |
|
in6_addmulti(struct in6_addr *maddr6, struct ifnet *ifp, |
|
int *errorp, int timer) |
|
{ |
|
struct in6_ifaddr *ia; |
|
struct in6_ifreq ifr; |
|
struct in6_multi *in6m; |
|
int s = splsoftnet(); |
|
|
|
*errorp = 0; |
|
|
/* |
/* |
* Request loopback of the report if we are acting as a multicast |
* See if address already in list. |
* router, so that the process-level routing daemon can hear it. |
|
*/ |
*/ |
im6o.im6o_multicast_loop = (ip6_mrouter != NULL); |
IN6_LOOKUP_MULTI(*maddr6, ifp, in6m); |
|
if (in6m != NULL) { |
|
/* |
|
* Found it; just increment the refrence count. |
|
*/ |
|
in6m->in6m_refcount++; |
|
} else { |
|
/* |
|
* New address; allocate a new multicast record |
|
* and link it into the interface's multicast list. |
|
*/ |
|
in6m = (struct in6_multi *) |
|
malloc(sizeof(*in6m), M_IPMADDR, M_NOWAIT); |
|
if (in6m == NULL) { |
|
splx(s); |
|
*errorp = ENOBUFS; |
|
return (NULL); |
|
} |
|
|
/* increment output statictics */ |
memset(in6m, 0, sizeof(*in6m)); |
icmp6stat.icp6s_outhist[type]++; |
in6m->in6m_addr = *maddr6; |
|
in6m->in6m_ifp = ifp; |
|
in6m->in6m_refcount = 1; |
|
in6m->in6m_timer = IN6M_TIMER_UNDEF; |
|
in6m->in6m_timer_ch = |
|
malloc(sizeof(*in6m->in6m_timer_ch), M_IPMADDR, M_NOWAIT); |
|
if (in6m->in6m_timer_ch == NULL) { |
|
free(in6m, M_IPMADDR); |
|
splx(s); |
|
return (NULL); |
|
} |
|
IFP_TO_IA6(ifp, ia); |
|
if (ia == NULL) { |
|
/* leaks in6m_timer_ch */ |
|
free(in6m, M_IPMADDR); |
|
splx(s); |
|
*errorp = EADDRNOTAVAIL; /* appropriate? */ |
|
return (NULL); |
|
} |
|
in6m->in6m_ia = ia; |
|
IFAREF(&ia->ia_ifa); /* gain a reference */ |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
|
ip6_output(mh, &ip6_opts, NULL, 0, &im6o, &outif); |
/* |
if (outif) { |
* Ask the network driver to update its multicast reception |
icmp6_ifstat_inc(outif, ifs6_out_msg); |
* filter appropriately for the new address. |
switch(type) { |
*/ |
case MLD6_LISTENER_QUERY: |
sockaddr_in6_init(&ifr.ifr_addr, maddr6, 0, 0, 0); |
icmp6_ifstat_inc(outif, ifs6_out_mldquery); |
if (ifp->if_ioctl == NULL) |
break; |
*errorp = ENXIO; /* XXX: appropriate? */ |
case MLD6_LISTENER_REPORT: |
else |
icmp6_ifstat_inc(outif, ifs6_out_mldreport); |
*errorp = (*ifp->if_ioctl)(ifp, SIOCADDMULTI, |
break; |
(void *)&ifr); |
case MLD6_LISTENER_DONE: |
if (*errorp) { |
icmp6_ifstat_inc(outif, ifs6_out_mlddone); |
LIST_REMOVE(in6m, in6m_entry); |
break; |
/* leaks in6m_timer_ch */ |
|
free(in6m, M_IPMADDR); |
|
IFAFREE(&ia->ia_ifa); |
|
splx(s); |
|
return (NULL); |
} |
} |
|
|
|
callout_init(in6m->in6m_timer_ch, 0); |
|
in6m->in6m_timer = timer; |
|
if (in6m->in6m_timer > 0) { |
|
in6m->in6m_state = MLD_REPORTPENDING; |
|
mld_starttimer(in6m); |
|
|
|
splx(s); |
|
return (in6m); |
|
} |
|
|
|
/* |
|
* Let MLD6 know that we have joined a new IP6 multicast |
|
* group. |
|
*/ |
|
mld_start_listening(in6m); |
|
} |
|
splx(s); |
|
return (in6m); |
|
} |
|
|
|
/* |
|
* Delete a multicast address record. |
|
*/ |
|
void |
|
in6_delmulti(struct in6_multi *in6m) |
|
{ |
|
struct in6_ifreq ifr; |
|
struct in6_ifaddr *ia; |
|
int s = splsoftnet(); |
|
|
|
mld_stoptimer(in6m); |
|
|
|
if (--in6m->in6m_refcount == 0) { |
|
/* |
|
* No remaining claims to this record; let MLD6 know |
|
* that we are leaving the multicast group. |
|
*/ |
|
mld_stop_listening(in6m); |
|
|
|
/* |
|
* Unlink from list. |
|
*/ |
|
LIST_REMOVE(in6m, in6m_entry); |
|
if (in6m->in6m_ia != NULL) { |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ |
|
in6m->in6m_ia = NULL; |
|
} |
|
|
|
/* |
|
* Delete all references of this multicasting group from |
|
* the membership arrays |
|
*/ |
|
for (ia = in6_ifaddr; ia; ia = ia->ia_next) { |
|
struct in6_multi_mship *imm; |
|
LIST_FOREACH(imm, &ia->ia6_memberships, i6mm_chain) { |
|
if (imm->i6mm_maddr == in6m) |
|
imm->i6mm_maddr = NULL; |
|
} |
|
} |
|
|
|
/* |
|
* Notify the network driver to update its multicast |
|
* reception filter. |
|
*/ |
|
sockaddr_in6_init(&ifr.ifr_addr, &in6m->in6m_addr, 0, 0, 0); |
|
(*in6m->in6m_ifp->if_ioctl)(in6m->in6m_ifp, |
|
SIOCDELMULTI, (void *)&ifr); |
|
free(in6m->in6m_timer_ch, M_IPMADDR); |
|
free(in6m, M_IPMADDR); |
|
} |
|
splx(s); |
|
} |
|
|
|
|
|
struct in6_multi_mship * |
|
in6_joingroup(struct ifnet *ifp, struct in6_addr *addr, |
|
int *errorp, int timer) |
|
{ |
|
struct in6_multi_mship *imm; |
|
|
|
imm = malloc(sizeof(*imm), M_IPMADDR, M_NOWAIT); |
|
if (!imm) { |
|
*errorp = ENOBUFS; |
|
return NULL; |
|
} |
|
|
|
memset(imm, 0, sizeof(*imm)); |
|
imm->i6mm_maddr = in6_addmulti(addr, ifp, errorp, timer); |
|
if (!imm->i6mm_maddr) { |
|
/* *errorp is already set */ |
|
free(imm, M_IPMADDR); |
|
return NULL; |
|
} |
|
return imm; |
|
} |
|
|
|
int |
|
in6_leavegroup(struct in6_multi_mship *imm) |
|
{ |
|
|
|
if (imm->i6mm_maddr) { |
|
in6_delmulti(imm->i6mm_maddr); |
|
} |
|
free(imm, M_IPMADDR); |
|
return 0; |
|
} |
|
|
|
|
|
/* |
|
* Multicast address kludge: |
|
* If there were any multicast addresses attached to this interface address, |
|
* either move them to another address on this interface, or save them until |
|
* such time as this interface is reconfigured for IPv6. |
|
*/ |
|
void |
|
in6_savemkludge(struct in6_ifaddr *oia) |
|
{ |
|
struct in6_ifaddr *ia; |
|
struct in6_multi *in6m; |
|
|
|
IFP_TO_IA6(oia->ia_ifp, ia); |
|
if (ia) { /* there is another address */ |
|
KASSERT(ia != oia); |
|
while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
IFAREF(&ia->ia_ifa); |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); |
|
in6m->in6m_ia = ia; |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
} |
|
} else { /* last address on this if deleted, save */ |
|
struct multi6_kludge *mk; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
|
if (mk->mk_ifp == oia->ia_ifp) |
|
break; |
|
} |
|
if (mk == NULL) /* this should not happen! */ |
|
panic("in6_savemkludge: no kludge space"); |
|
|
|
while ((in6m = LIST_FIRST(&oia->ia6_multiaddrs)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
IFAFREE(&in6m->in6m_ia->ia_ifa); /* release reference */ |
|
in6m->in6m_ia = NULL; |
|
LIST_INSERT_HEAD(&mk->mk_head, in6m, in6m_entry); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Continuation of multicast address hack: |
|
* If there was a multicast group list previously saved for this interface, |
|
* then we re-attach it to the first address configured on the i/f. |
|
*/ |
|
void |
|
in6_restoremkludge(struct in6_ifaddr *ia, struct ifnet *ifp) |
|
{ |
|
struct multi6_kludge *mk; |
|
struct in6_multi *in6m; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
|
if (mk->mk_ifp == ifp) |
|
break; |
|
} |
|
if (mk == NULL) |
|
return; |
|
while ((in6m = LIST_FIRST(&mk->mk_head)) != NULL) { |
|
LIST_REMOVE(in6m, in6m_entry); |
|
in6m->in6m_ia = ia; |
|
IFAREF(&ia->ia_ifa); |
|
LIST_INSERT_HEAD(&ia->ia6_multiaddrs, in6m, in6m_entry); |
|
} |
|
} |
|
|
|
/* |
|
* Allocate space for the kludge at interface initialization time. |
|
* Formerly, we dynamically allocated the space in in6_savemkludge() with |
|
* malloc(M_WAITOK). However, it was wrong since the function could be called |
|
* under an interrupt context (software timer on address lifetime expiration). |
|
* Also, we cannot just give up allocating the strucutre, since the group |
|
* membership structure is very complex and we need to keep it anyway. |
|
* Of course, this function MUST NOT be called under an interrupt context. |
|
* Specifically, it is expected to be called only from in6_ifattach(), though |
|
* it is a global function. |
|
*/ |
|
void |
|
in6_createmkludge(struct ifnet *ifp) |
|
{ |
|
struct multi6_kludge *mk; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
|
/* If we've already had one, do not allocate. */ |
|
if (mk->mk_ifp == ifp) |
|
return; |
|
} |
|
|
|
mk = malloc(sizeof(*mk), M_IPMADDR, M_WAITOK); |
|
|
|
memset(mk, 0, sizeof(*mk)); |
|
LIST_INIT(&mk->mk_head); |
|
mk->mk_ifp = ifp; |
|
LIST_INSERT_HEAD(&in6_mk, mk, mk_entry); |
|
} |
|
|
|
void |
|
in6_purgemkludge(struct ifnet *ifp) |
|
{ |
|
struct multi6_kludge *mk; |
|
struct in6_multi *in6m, *next; |
|
|
|
LIST_FOREACH(mk, &in6_mk, mk_entry) { |
|
if (mk->mk_ifp == ifp) |
|
break; |
|
} |
|
if (mk == NULL) |
|
return; |
|
|
|
/* leave from all multicast groups joined */ |
|
for (in6m = LIST_FIRST(&mk->mk_head); in6m != NULL; in6m = next) { |
|
next = LIST_NEXT(in6m, in6m_entry); |
|
in6_delmulti(in6m); |
} |
} |
|
LIST_REMOVE(mk, mk_entry); |
|
free(mk, M_IPMADDR); |
} |
} |