mcast.c 68.3 KB
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/*
 *	Multicast support for IPv6
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
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 *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
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 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

/* Changes:
 *
 *	yoshfuji	: fix format of router-alert option
 *	YOSHIFUJI Hideaki @USAGI:
 *		Fixed source address for MLD message based on
 *		<draft-ietf-magma-mld-source-05.txt>.
 *	YOSHIFUJI Hideaki @USAGI:
 *		- Ignore Queries for invalid addresses.
 *		- MLD for link-local addresses.
 *	David L Stevens <dlstevens@us.ibm.com>:
 *		- MLDv2 support
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/jiffies.h>
#include <linux/times.h>
#include <linux/net.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/route.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/pkt_sched.h>
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#include <net/mld.h>
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#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

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#include <net/net_namespace.h>
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#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/if_inet6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
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#include <net/inet_common.h>
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#include <net/ip6_checksum.h>

/* Set to 3 to get tracing... */
#define MCAST_DEBUG 2

#if MCAST_DEBUG >= 3
#define MDBG(x) printk x
#else
#define MDBG(x)
#endif

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/* Ensure that we have struct in6_addr aligned on 32bit word. */
static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
	BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
	BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
	BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
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};

static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;

/* Big mc list lock for all the sockets */
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static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
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static void igmp6_join_group(struct ifmcaddr6 *ma);
static void igmp6_leave_group(struct ifmcaddr6 *ma);
static void igmp6_timer_handler(unsigned long data);

static void mld_gq_timer_expire(unsigned long data);
static void mld_ifc_timer_expire(unsigned long data);
static void mld_ifc_event(struct inet6_dev *idev);
static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
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static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
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static void mld_clear_delrec(struct inet6_dev *idev);
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static bool mld_in_v1_mode(const struct inet6_dev *idev);
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static int sf_setstate(struct ifmcaddr6 *pmc);
static void sf_markstate(struct ifmcaddr6 *pmc);
static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
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static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
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			  int delta);
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static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
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			  int delta);
static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
			    struct inet6_dev *idev);

#define MLD_QRV_DEFAULT		2
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/* RFC3810, 9.2. Query Interval */
#define MLD_QI_DEFAULT		(125 * HZ)
/* RFC3810, 9.3. Query Response Interval */
#define MLD_QRI_DEFAULT		(10 * HZ)
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/* RFC3810, 8.1 Query Version Distinctions */
#define MLD_V1_QUERY_LEN	24
#define MLD_V2_QUERY_LEN_MIN	28

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#define IPV6_MLD_MAX_MSF	64
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int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
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/*
 *	socket join on multicast group
 */

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#define for_each_pmc_rcu(np, pmc)				\
	for (pmc = rcu_dereference(np->ipv6_mc_list);		\
	     pmc != NULL;					\
	     pmc = rcu_dereference(pmc->next))

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static int unsolicited_report_interval(struct inet6_dev *idev)
{
	int iv;

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	if (mld_in_v1_mode(idev))
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		iv = idev->cnf.mldv1_unsolicited_report_interval;
	else
		iv = idev->cnf.mldv2_unsolicited_report_interval;

	return iv > 0 ? iv : 1;
}

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int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
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{
	struct net_device *dev = NULL;
	struct ipv6_mc_socklist *mc_lst;
	struct ipv6_pinfo *np = inet6_sk(sk);
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	struct net *net = sock_net(sk);
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	int err;

	if (!ipv6_addr_is_multicast(addr))
		return -EINVAL;

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	rcu_read_lock();
	for_each_pmc_rcu(np, mc_lst) {
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		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
		    ipv6_addr_equal(&mc_lst->addr, addr)) {
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			rcu_read_unlock();
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			return -EADDRINUSE;
		}
	}
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	rcu_read_unlock();
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	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);

	if (mc_lst == NULL)
		return -ENOMEM;

	mc_lst->next = NULL;
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	mc_lst->addr = *addr;
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	rcu_read_lock();
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	if (ifindex == 0) {
		struct rt6_info *rt;
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		rt = rt6_lookup(net, addr, NULL, 0, 0);
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		if (rt) {
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			dev = rt->dst.dev;
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			ip6_rt_put(rt);
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		}
	} else
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		dev = dev_get_by_index_rcu(net, ifindex);
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	if (dev == NULL) {
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		rcu_read_unlock();
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		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
		return -ENODEV;
	}

	mc_lst->ifindex = dev->ifindex;
	mc_lst->sfmode = MCAST_EXCLUDE;
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	rwlock_init(&mc_lst->sflock);
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	mc_lst->sflist = NULL;

	/*
	 *	now add/increase the group membership on the device
	 */

	err = ipv6_dev_mc_inc(dev, addr);

	if (err) {
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		rcu_read_unlock();
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		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
		return err;
	}

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	spin_lock(&ipv6_sk_mc_lock);
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	mc_lst->next = np->ipv6_mc_list;
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	rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
	spin_unlock(&ipv6_sk_mc_lock);
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	rcu_read_unlock();
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	return 0;
}

/*
 *	socket leave on multicast group
 */
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int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
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	struct ipv6_mc_socklist *mc_lst;
	struct ipv6_mc_socklist __rcu **lnk;
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	struct net *net = sock_net(sk);
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	if (!ipv6_addr_is_multicast(addr))
		return -EINVAL;

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	spin_lock(&ipv6_sk_mc_lock);
	for (lnk = &np->ipv6_mc_list;
	     (mc_lst = rcu_dereference_protected(*lnk,
			lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
	      lnk = &mc_lst->next) {
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		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
		    ipv6_addr_equal(&mc_lst->addr, addr)) {
			struct net_device *dev;

			*lnk = mc_lst->next;
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			spin_unlock(&ipv6_sk_mc_lock);
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			rcu_read_lock();
			dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
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			if (dev != NULL) {
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				struct inet6_dev *idev = __in6_dev_get(dev);
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				(void) ip6_mc_leave_src(sk, mc_lst, idev);
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				if (idev)
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					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
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			} else
				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
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			rcu_read_unlock();
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			atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
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			kfree_rcu(mc_lst, rcu);
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			return 0;
		}
	}
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	spin_unlock(&ipv6_sk_mc_lock);
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	return -EADDRNOTAVAIL;
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}

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/* called with rcu_read_lock() */
static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
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					     const struct in6_addr *group,
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					     int ifindex)
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{
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;

	if (ifindex == 0) {
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		struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
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		if (rt) {
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			dev = rt->dst.dev;
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			ip6_rt_put(rt);
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		}
	} else
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		dev = dev_get_by_index_rcu(net, ifindex);
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	if (!dev)
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		return NULL;
	idev = __in6_dev_get(dev);
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	if (!idev)
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		return NULL;
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	read_lock_bh(&idev->lock);
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	if (idev->dead) {
		read_unlock_bh(&idev->lock);
		return NULL;
	}
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	return idev;
}

void ipv6_sock_mc_close(struct sock *sk)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6_mc_socklist *mc_lst;
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	struct net *net = sock_net(sk);
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	if (!rcu_access_pointer(np->ipv6_mc_list))
		return;

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	spin_lock(&ipv6_sk_mc_lock);
	while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
				lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
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		struct net_device *dev;

		np->ipv6_mc_list = mc_lst->next;
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		spin_unlock(&ipv6_sk_mc_lock);
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		rcu_read_lock();
		dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
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		if (dev) {
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			struct inet6_dev *idev = __in6_dev_get(dev);
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			(void) ip6_mc_leave_src(sk, mc_lst, idev);
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			if (idev)
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				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
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		} else
			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
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		rcu_read_unlock();
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		atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
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		kfree_rcu(mc_lst, rcu);
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		spin_lock(&ipv6_sk_mc_lock);
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	}
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	spin_unlock(&ipv6_sk_mc_lock);
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}

int ip6_mc_source(int add, int omode, struct sock *sk,
	struct group_source_req *pgsr)
{
	struct in6_addr *source, *group;
	struct ipv6_mc_socklist *pmc;
	struct inet6_dev *idev;
	struct ipv6_pinfo *inet6 = inet6_sk(sk);
	struct ip6_sf_socklist *psl;
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	struct net *net = sock_net(sk);
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	int i, j, rv;
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	int leavegroup = 0;
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	int pmclocked = 0;
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	int err;

	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;

	if (!ipv6_addr_is_multicast(group))
		return -EINVAL;

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	rcu_read_lock();
	idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
	if (!idev) {
		rcu_read_unlock();
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		return -ENODEV;
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	}
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	err = -EADDRNOTAVAIL;

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	for_each_pmc_rcu(inet6, pmc) {
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		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
			continue;
		if (ipv6_addr_equal(&pmc->addr, group))
			break;
	}
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	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
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		goto done;
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	}
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	/* if a source filter was set, must be the same mode as before */
	if (pmc->sflist) {
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		if (pmc->sfmode != omode) {
			err = -EINVAL;
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			goto done;
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		}
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	} else if (pmc->sfmode != omode) {
		/* allow mode switches for empty-set filters */
		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
		pmc->sfmode = omode;
	}

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	write_lock(&pmc->sflock);
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	pmclocked = 1;

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	psl = pmc->sflist;
	if (!add) {
		if (!psl)
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			goto done;	/* err = -EADDRNOTAVAIL */
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		rv = !0;
		for (i=0; i<psl->sl_count; i++) {
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			rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
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			if (rv == 0)
				break;
		}
		if (rv)		/* source not found */
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			goto done;	/* err = -EADDRNOTAVAIL */
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		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
			leavegroup = 1;
			goto done;
		}

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		/* update the interface filter */
		ip6_mc_del_src(idev, group, omode, 1, source, 1);

		for (j=i+1; j<psl->sl_count; j++)
			psl->sl_addr[j-1] = psl->sl_addr[j];
		psl->sl_count--;
		err = 0;
		goto done;
	}
	/* else, add a new source to the filter */

	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
		err = -ENOBUFS;
		goto done;
	}
	if (!psl || psl->sl_count == psl->sl_max) {
		struct ip6_sf_socklist *newpsl;
		int count = IP6_SFBLOCK;

		if (psl)
			count += psl->sl_max;
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		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
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		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = count;
		newpsl->sl_count = count - IP6_SFBLOCK;
		if (psl) {
			for (i=0; i<psl->sl_count; i++)
				newpsl->sl_addr[i] = psl->sl_addr[i];
			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
		}
		pmc->sflist = psl = newpsl;
	}
	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
	for (i=0; i<psl->sl_count; i++) {
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		rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
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		if (rv == 0) /* There is an error in the address. */
			goto done;
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	}
	for (j=psl->sl_count-1; j>=i; j--)
		psl->sl_addr[j+1] = psl->sl_addr[j];
	psl->sl_addr[i] = *source;
	psl->sl_count++;
	err = 0;
	/* update the interface list */
	ip6_mc_add_src(idev, group, omode, 1, source, 1);
done:
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	if (pmclocked)
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		write_unlock(&pmc->sflock);
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	read_unlock_bh(&idev->lock);
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	rcu_read_unlock();
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	if (leavegroup)
		return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
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	return err;
}

int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
{
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	const struct in6_addr *group;
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	struct ipv6_mc_socklist *pmc;
	struct inet6_dev *idev;
	struct ipv6_pinfo *inet6 = inet6_sk(sk);
	struct ip6_sf_socklist *newpsl, *psl;
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	struct net *net = sock_net(sk);
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	int leavegroup = 0;
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	int i, err;

	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;

	if (!ipv6_addr_is_multicast(group))
		return -EINVAL;
	if (gsf->gf_fmode != MCAST_INCLUDE &&
	    gsf->gf_fmode != MCAST_EXCLUDE)
		return -EINVAL;

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	rcu_read_lock();
	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
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	if (!idev) {
		rcu_read_unlock();
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		return -ENODEV;
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	}
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	err = 0;
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	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
		leavegroup = 1;
		goto done;
	}

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	for_each_pmc_rcu(inet6, pmc) {
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		if (pmc->ifindex != gsf->gf_interface)
			continue;
		if (ipv6_addr_equal(&pmc->addr, group))
			break;
	}
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	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
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		goto done;
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	}
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	if (gsf->gf_numsrc) {
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		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
							  GFP_ATOMIC);
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		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
		for (i=0; i<newpsl->sl_count; ++i) {
			struct sockaddr_in6 *psin6;

			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
			newpsl->sl_addr[i] = psin6->sin6_addr;
		}
		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
			newpsl->sl_count, newpsl->sl_addr, 0);
		if (err) {
			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
			goto done;
		}
529
	} else {
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		newpsl = NULL;
531 532
		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
	}
533

534
	write_lock(&pmc->sflock);
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	psl = pmc->sflist;
	if (psl) {
		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
			psl->sl_count, psl->sl_addr, 0);
		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
	} else
		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
	pmc->sflist = newpsl;
	pmc->sfmode = gsf->gf_fmode;
544
	write_unlock(&pmc->sflock);
545
	err = 0;
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done:
	read_unlock_bh(&idev->lock);
548
	rcu_read_unlock();
549 550
	if (leavegroup)
		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
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	return err;
}

int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
	struct group_filter __user *optval, int __user *optlen)
{
	int err, i, count, copycount;
558
	const struct in6_addr *group;
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	struct ipv6_mc_socklist *pmc;
	struct inet6_dev *idev;
	struct ipv6_pinfo *inet6 = inet6_sk(sk);
	struct ip6_sf_socklist *psl;
563
	struct net *net = sock_net(sk);
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	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;

	if (!ipv6_addr_is_multicast(group))
		return -EINVAL;

570 571
	rcu_read_lock();
	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
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	if (!idev) {
		rcu_read_unlock();
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		return -ENODEV;
576
	}
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	err = -EADDRNOTAVAIL;
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	/*
	 * changes to the ipv6_mc_list require the socket lock and
	 * a read lock on ip6_sk_mc_lock. We have the socket lock,
	 * so reading the list is safe.
	 */
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585
	for_each_pmc_rcu(inet6, pmc) {
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		if (pmc->ifindex != gsf->gf_interface)
			continue;
		if (ipv6_addr_equal(group, &pmc->addr))
			break;
	}
	if (!pmc)		/* must have a prior join */
		goto done;
	gsf->gf_fmode = pmc->sfmode;
	psl = pmc->sflist;
	count = psl ? psl->sl_count : 0;
	read_unlock_bh(&idev->lock);
597
	rcu_read_unlock();
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	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
	gsf->gf_numsrc = count;
	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
		return -EFAULT;
	}
605 606 607 608
	/* changes to psl require the socket lock, a read lock on
	 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
	 * have the socket lock, so reading here is safe.
	 */
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	for (i=0; i<copycount; i++) {
		struct sockaddr_in6 *psin6;
		struct sockaddr_storage ss;

		psin6 = (struct sockaddr_in6 *)&ss;
		memset(&ss, 0, sizeof(ss));
		psin6->sin6_family = AF_INET6;
		psin6->sin6_addr = psl->sl_addr[i];
617
		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
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			return -EFAULT;
	}
	return 0;
done:
	read_unlock_bh(&idev->lock);
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	rcu_read_unlock();
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	return err;
}

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bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
		    const struct in6_addr *src_addr)
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{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct ipv6_mc_socklist *mc;
	struct ip6_sf_socklist *psl;
633
	bool rv = true;
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	rcu_read_lock();
	for_each_pmc_rcu(np, mc) {
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		if (ipv6_addr_equal(&mc->addr, mc_addr))
			break;
	}
	if (!mc) {
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		rcu_read_unlock();
642
		return true;
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	}
644
	read_lock(&mc->sflock);
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	psl = mc->sflist;
	if (!psl) {
		rv = mc->sfmode == MCAST_EXCLUDE;
	} else {
		int i;

		for (i=0; i<psl->sl_count; i++) {
			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
				break;
		}
		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
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			rv = false;
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		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
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			rv = false;
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	}
660
	read_unlock(&mc->sflock);
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	rcu_read_unlock();
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	return rv;
}

static void ma_put(struct ifmcaddr6 *mc)
{
	if (atomic_dec_and_test(&mc->mca_refcnt)) {
		in6_dev_put(mc->idev);
		kfree(mc);
	}
}

static void igmp6_group_added(struct ifmcaddr6 *mc)
{
	struct net_device *dev = mc->idev->dev;
	char buf[MAX_ADDR_LEN];

679 680 681 682
	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
	    IPV6_ADDR_SCOPE_LINKLOCAL)
		return;

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	spin_lock_bh(&mc->mca_lock);
	if (!(mc->mca_flags&MAF_LOADED)) {
		mc->mca_flags |= MAF_LOADED;
		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
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			dev_mc_add(dev, buf);
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	}
	spin_unlock_bh(&mc->mca_lock);

	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
		return;

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	if (mld_in_v1_mode(mc->idev)) {
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		igmp6_join_group(mc);
		return;
	}
	/* else v2 */

	mc->mca_crcount = mc->idev->mc_qrv;
	mld_ifc_event(mc->idev);
}

static void igmp6_group_dropped(struct ifmcaddr6 *mc)
{
	struct net_device *dev = mc->idev->dev;
	char buf[MAX_ADDR_LEN];

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	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
	    IPV6_ADDR_SCOPE_LINKLOCAL)
		return;

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	spin_lock_bh(&mc->mca_lock);
	if (mc->mca_flags&MAF_LOADED) {
		mc->mca_flags &= ~MAF_LOADED;
		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
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			dev_mc_del(dev, buf);
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	}

	if (mc->mca_flags & MAF_NOREPORT)
		goto done;
	spin_unlock_bh(&mc->mca_lock);

	if (!mc->idev->dead)
		igmp6_leave_group(mc);

	spin_lock_bh(&mc->mca_lock);
	if (del_timer(&mc->mca_timer))
		atomic_dec(&mc->mca_refcnt);
done:
	ip6_mc_clear_src(mc);
	spin_unlock_bh(&mc->mca_lock);
}

/*
 * deleted ifmcaddr6 manipulation
 */
static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
{
	struct ifmcaddr6 *pmc;

	/* this is an "ifmcaddr6" for convenience; only the fields below
	 * are actually used. In particular, the refcnt and users are not
	 * used for management of the delete list. Using the same structure
	 * for deleted items allows change reports to use common code with
	 * non-deleted or query-response MCA's.
	 */
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	pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
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	if (!pmc)
		return;
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	spin_lock_bh(&im->mca_lock);
	spin_lock_init(&pmc->mca_lock);
	pmc->idev = im->idev;
	in6_dev_hold(idev);
	pmc->mca_addr = im->mca_addr;
	pmc->mca_crcount = idev->mc_qrv;
	pmc->mca_sfmode = im->mca_sfmode;
	if (pmc->mca_sfmode == MCAST_INCLUDE) {
		struct ip6_sf_list *psf;

		pmc->mca_tomb = im->mca_tomb;
		pmc->mca_sources = im->mca_sources;
		im->mca_tomb = im->mca_sources = NULL;
		for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
			psf->sf_crcount = pmc->mca_crcount;
	}
	spin_unlock_bh(&im->mca_lock);

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	spin_lock_bh(&idev->mc_lock);
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	pmc->next = idev->mc_tomb;
	idev->mc_tomb = pmc;
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	spin_unlock_bh(&idev->mc_lock);
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}

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static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
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{
	struct ifmcaddr6 *pmc, *pmc_prev;
	struct ip6_sf_list *psf, *psf_next;

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	spin_lock_bh(&idev->mc_lock);
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	pmc_prev = NULL;
	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
			break;
		pmc_prev = pmc;
	}
	if (pmc) {
		if (pmc_prev)
			pmc_prev->next = pmc->next;
		else
			idev->mc_tomb = pmc->next;
	}
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	spin_unlock_bh(&idev->mc_lock);

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	if (pmc) {
		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
			psf_next = psf->sf_next;
			kfree(psf);
		}
		in6_dev_put(pmc->idev);
		kfree(pmc);
	}
}

static void mld_clear_delrec(struct inet6_dev *idev)
{
	struct ifmcaddr6 *pmc, *nextpmc;

810
	spin_lock_bh(&idev->mc_lock);
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	pmc = idev->mc_tomb;
	idev->mc_tomb = NULL;
813
	spin_unlock_bh(&idev->mc_lock);
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	for (; pmc; pmc = nextpmc) {
		nextpmc = pmc->next;
		ip6_mc_clear_src(pmc);
		in6_dev_put(pmc->idev);
		kfree(pmc);
	}

	/* clear dead sources, too */
	read_lock_bh(&idev->lock);
	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
		struct ip6_sf_list *psf, *psf_next;

		spin_lock_bh(&pmc->mca_lock);
		psf = pmc->mca_tomb;
		pmc->mca_tomb = NULL;
		spin_unlock_bh(&pmc->mca_lock);
		for (; psf; psf=psf_next) {
			psf_next = psf->sf_next;
			kfree(psf);
		}
	}
	read_unlock_bh(&idev->lock);
}


/*
 *	device multicast group inc (add if not found)
 */
843
int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
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{
	struct ifmcaddr6 *mc;
	struct inet6_dev *idev;

848
	/* we need to take a reference on idev */
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	idev = in6_dev_get(dev);

	if (idev == NULL)
		return -EINVAL;

	write_lock_bh(&idev->lock);
	if (idev->dead) {
		write_unlock_bh(&idev->lock);
		in6_dev_put(idev);
		return -ENODEV;
	}

	for (mc = idev->mc_list; mc; mc = mc->next) {
		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
			mc->mca_users++;
			write_unlock_bh(&idev->lock);
			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
				NULL, 0);
			in6_dev_put(idev);
			return 0;
		}
	}

	/*
	 *	not found: create a new one.
	 */

876
	mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
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	if (mc == NULL) {
		write_unlock_bh(&idev->lock);
		in6_dev_put(idev);
		return -ENOMEM;
	}

884
	setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
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886
	mc->mca_addr = *addr;
887
	mc->idev = idev; /* (reference taken) */
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	mc->mca_users = 1;
	/* mca_stamp should be updated upon changes */
	mc->mca_cstamp = mc->mca_tstamp = jiffies;
	atomic_set(&mc->mca_refcnt, 2);
	spin_lock_init(&mc->mca_lock);

	/* initial mode is (EX, empty) */
	mc->mca_sfmode = MCAST_EXCLUDE;
	mc->mca_sfcount[MCAST_EXCLUDE] = 1;

	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
		mc->mca_flags |= MAF_NOREPORT;

	mc->next = idev->mc_list;
	idev->mc_list = mc;
	write_unlock_bh(&idev->lock);

	mld_del_delrec(idev, &mc->mca_addr);
	igmp6_group_added(mc);
	ma_put(mc);
	return 0;
}

/*
 *	device multicast group del
 */
915
int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
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{
	struct ifmcaddr6 *ma, **map;

	write_lock_bh(&idev->lock);
	for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
			if (--ma->mca_users == 0) {
				*map = ma->next;
				write_unlock_bh(&idev->lock);

				igmp6_group_dropped(ma);

				ma_put(ma);
				return 0;
			}
			write_unlock_bh(&idev->lock);
			return 0;
		}
	}
	write_unlock_bh(&idev->lock);

	return -ENOENT;
}

940
int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
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{
942
	struct inet6_dev *idev;
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	int err;

945
	rcu_read_lock();
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	idev = __in6_dev_get(dev);
	if (!idev)
		err = -ENODEV;
	else
		err = __ipv6_dev_mc_dec(idev, addr);
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953
	rcu_read_unlock();
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	return err;
}

/*
 *	check if the interface/address pair is valid
 */
960 961
bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
			 const struct in6_addr *src_addr)
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{
	struct inet6_dev *idev;
	struct ifmcaddr6 *mc;
965
	bool rv = false;
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967 968
	rcu_read_lock();
	idev = __in6_dev_get(dev);
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	if (idev) {
		read_lock_bh(&idev->lock);
		for (mc = idev->mc_list; mc; mc=mc->next) {
			if (ipv6_addr_equal(&mc->mca_addr, group))
				break;
		}
		if (mc) {
			if (src_addr && !ipv6_addr_any(src_addr)) {
				struct ip6_sf_list *psf;

				spin_lock_bh(&mc->mca_lock);
				for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
						break;
				}
				if (psf)
					rv = psf->sf_count[MCAST_INCLUDE] ||
						psf->sf_count[MCAST_EXCLUDE] !=
						mc->mca_sfcount[MCAST_EXCLUDE];
				else
					rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
				spin_unlock_bh(&mc->mca_lock);
			} else
992
				rv = true; /* don't filter unspecified source */
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		}
		read_unlock_bh(&idev->lock);
	}
996
	rcu_read_unlock();
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	return rv;
}

static void mld_gq_start_timer(struct inet6_dev *idev)
{
1002
	unsigned long tv = prandom_u32() % idev->mc_maxdelay;
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	idev->mc_gq_running = 1;
	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
		in6_dev_hold(idev);
}

1009 1010 1011 1012 1013 1014 1015
static void mld_gq_stop_timer(struct inet6_dev *idev)
{
	idev->mc_gq_running = 0;
	if (del_timer(&idev->mc_gq_timer))
		__in6_dev_put(idev);
}

1016
static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
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{
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	unsigned long tv = prandom_u32() % delay;
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	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
		in6_dev_hold(idev);
}

1024 1025 1026 1027 1028 1029 1030
static void mld_ifc_stop_timer(struct inet6_dev *idev)
{
	idev->mc_ifc_count = 0;
	if (del_timer(&idev->mc_ifc_timer))
		__in6_dev_put(idev);
}

1031
static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032
{
1033
	unsigned long tv = prandom_u32() % delay;
1034 1035 1036 1037 1038

	if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
		in6_dev_hold(idev);
}

1039 1040 1041 1042 1043 1044
static void mld_dad_stop_timer(struct inet6_dev *idev)
{
	if (del_timer(&idev->mc_dad_timer))
		__in6_dev_put(idev);
}

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/*
 *	IGMP handling (alias multicast ICMPv6 messages)
 */

static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
{
	unsigned long delay = resptime;

	/* Do not start timer for these addresses */
	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
		return;

	if (del_timer(&ma->mca_timer)) {
		atomic_dec(&ma->mca_refcnt);
		delay = ma->mca_timer.expires - jiffies;
	}

1063
	if (delay >= resptime)
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		delay = prandom_u32() % resptime;
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	ma->mca_timer.expires = jiffies + delay;
	if (!mod_timer(&ma->mca_timer, jiffies + delay))
		atomic_inc(&ma->mca_refcnt);
	ma->mca_flags |= MAF_TIMER_RUNNING;
}

1072
/* mark EXCLUDE-mode sources */
1073 1074
static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
			     const struct in6_addr *srcs)
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{
	struct ip6_sf_list *psf;
	int i, scount;

	scount = 0;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (scount == nsrcs)
			break;
1083 1084
		for (i=0; i<nsrcs; i++) {
			/* skip inactive filters */
1085
			if (psf->sf_count[MCAST_INCLUDE] ||
1086 1087
			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
			    psf->sf_count[MCAST_EXCLUDE])
1088
				break;
1089 1090 1091 1092 1093 1094 1095 1096
			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
				scount++;
				break;
			}
		}
	}
	pmc->mca_flags &= ~MAF_GSQUERY;
	if (scount == nsrcs)	/* all sources excluded */
1097 1098
		return false;
	return true;
1099 1100
}

1101 1102
static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
			    const struct in6_addr *srcs)
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
{
	struct ip6_sf_list *psf;
	int i, scount;

	if (pmc->mca_sfmode == MCAST_EXCLUDE)
		return mld_xmarksources(pmc, nsrcs, srcs);

	/* mark INCLUDE-mode sources */

	scount = 0;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (scount == nsrcs)
			break;
		for (i=0; i<nsrcs; i++) {
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			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
				psf->sf_gsresp = 1;
				scount++;
				break;
			}
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		}
	}
	if (!scount) {
		pmc->mca_flags &= ~MAF_GSQUERY;
1126
		return false;
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	}
1128
	pmc->mca_flags |= MAF_GSQUERY;
1129
	return true;
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}

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static int mld_force_mld_version(const struct inet6_dev *idev)
{
	/* Normally, both are 0 here. If enforcement to a particular is
	 * being used, individual device enforcement will have a lower
	 * precedence over 'all' device (.../conf/all/force_mld_version).
	 */

	if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
		return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
	else
		return idev->cnf.force_mld_version;
}

static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
{
	return mld_force_mld_version(idev) == 2;
}

static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
{
	return mld_force_mld_version(idev) == 1;
}

1155 1156
static bool mld_in_v1_mode(const struct inet6_dev *idev)
{
1157 1158 1159
	if (mld_in_v2_mode_only(idev))
		return false;
	if (mld_in_v1_mode_only(idev))
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		return true;
	if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
		return true;

	return false;
}

1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
static void mld_set_v1_mode(struct inet6_dev *idev)
{
	/* RFC3810, relevant sections:
	 *  - 9.1. Robustness Variable
	 *  - 9.2. Query Interval
	 *  - 9.3. Query Response Interval
	 *  - 9.12. Older Version Querier Present Timeout
	 */
	unsigned long switchback;

	switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;

	idev->mc_v1_seen = jiffies + switchback;
}

static void mld_update_qrv(struct inet6_dev *idev,
			   const struct mld2_query *mlh2)
{
	/* RFC3810, relevant sections:
	 *  - 5.1.8. QRV (Querier's Robustness Variable)
	 *  - 9.1. Robustness Variable
	 */

	/* The value of the Robustness Variable MUST NOT be zero,
	 * and SHOULD NOT be one. Catch this here if we ever run
	 * into such a case in future.
	 */
	WARN_ON(idev->mc_qrv == 0);

	if (mlh2->mld2q_qrv > 0)
		idev->mc_qrv = mlh2->mld2q_qrv;

	if (unlikely(idev->mc_qrv < 2)) {
		net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
				     idev->mc_qrv, MLD_QRV_DEFAULT);
		idev->mc_qrv = MLD_QRV_DEFAULT;
	}
}

static void mld_update_qi(struct inet6_dev *idev,
			  const struct mld2_query *mlh2)
{
	/* RFC3810, relevant sections:
	 *  - 5.1.9. QQIC (Querier's Query Interval Code)
	 *  - 9.2. Query Interval
	 *  - 9.12. Older Version Querier Present Timeout
	 *    (the [Query Interval] in the last Query received)
	 */
	unsigned long mc_qqi;

	if (mlh2->mld2q_qqic < 128) {
		mc_qqi = mlh2->mld2q_qqic;
	} else {
		unsigned long mc_man, mc_exp;

		mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
		mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);

		mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
	}

	idev->mc_qi = mc_qqi * HZ;
}

static void mld_update_qri(struct inet6_dev *idev,
			   const struct mld2_query *mlh2)
{
	/* RFC3810, relevant sections:
	 *  - 5.1.3. Maximum Response Code
	 *  - 9.3. Query Response Interval
	 */
1238
	idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239 1240
}

1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256
static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
			  unsigned long *max_delay)
{
	unsigned long mldv1_md;

	/* Ignore v1 queries */
	if (mld_in_v2_mode_only(idev))
		return -EINVAL;

	/* MLDv1 router present */
	mldv1_md = ntohs(mld->mld_maxdelay);
	*max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);

	mld_set_v1_mode(idev);

	/* cancel MLDv2 report timer */
1257
	mld_gq_stop_timer(idev);
1258
	/* cancel the interface change timer */
1259
	mld_ifc_stop_timer(idev);
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	/* clear deleted report items */
	mld_clear_delrec(idev);

	return 0;
}

static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
			  unsigned long *max_delay)
{
	/* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
	if (mld_in_v1_mode(idev))
		return -EINVAL;

	*max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);

	mld_update_qrv(idev, mld);
	mld_update_qi(idev, mld);
	mld_update_qri(idev, mld);

	idev->mc_maxdelay = *max_delay;

	return 0;
}

1284
/* called with rcu_read_lock() */
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int igmp6_event_query(struct sk_buff *skb)
{
1287
	struct mld2_query *mlh2 = NULL;
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	struct ifmcaddr6 *ma;
1289
	const struct in6_addr *group;
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	unsigned long max_delay;
	struct inet6_dev *idev;
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	struct mld_msg *mld;
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	int group_type;
	int mark = 0;
1295
	int len, err;
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	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
		return -EINVAL;

	/* compute payload length excluding extension headers */
1301
	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
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	len -= skb_network_header_len(skb);
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	/* Drop queries with not link local source */
1305
	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
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		return -EINVAL;

1308
	idev = __in6_dev_get(skb->dev);
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	if (idev == NULL)
		return 0;

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	mld = (struct mld_msg *)icmp6_hdr(skb);
	group = &mld->mld_mca;
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	group_type = ipv6_addr_type(group);

	if (group_type != IPV6_ADDR_ANY &&
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	    !(group_type&IPV6_ADDR_MULTICAST))
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		return -EINVAL;

1320
	if (len == MLD_V1_QUERY_LEN) {
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		err = mld_process_v1(idev, mld, &max_delay);
		if (err < 0)
			return err;
1324
	} else if (len >= MLD_V2_QUERY_LEN_MIN) {
1325
		int srcs_offset = sizeof(struct mld2_query) -
1326
				  sizeof(struct icmp6hdr);
1327

1328
		if (!pskb_may_pull(skb, srcs_offset))
1329
			return -EINVAL;
1330

1331
		mlh2 = (struct mld2_query *)skb_transport_header(skb);
1332

1333 1334 1335
		err = mld_process_v2(idev, mlh2, &max_delay);
		if (err < 0)
			return err;
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		if (group_type == IPV6_ADDR_ANY) { /* general query */
1338
			if (mlh2->mld2q_nsrcs)
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				return -EINVAL; /* no sources allowed */
1340

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			mld_gq_start_timer(idev);
			return 0;
		}
		/* mark sources to include, if group & source-specific */
1345
		if (mlh2->mld2q_nsrcs != 0) {
1346
			if (!pskb_may_pull(skb, srcs_offset +
1347
			    ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1348
				return -EINVAL;
1349

1350
			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1351 1352
			mark = 1;
		}
1353
	} else
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		return -EINVAL;

	read_lock_bh(&idev->lock);
	if (group_type == IPV6_ADDR_ANY) {
		for (ma = idev->mc_list; ma; ma=ma->next) {
			spin_lock_bh(&ma->mca_lock);
			igmp6_group_queried(ma, max_delay);
			spin_unlock_bh(&ma->mca_lock);
		}
	} else {
		for (ma = idev->mc_list; ma; ma=ma->next) {
1365
			if (!ipv6_addr_equal(group, &ma->mca_addr))
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				continue;
			spin_lock_bh(&ma->mca_lock);
			if (ma->mca_flags & MAF_TIMER_RUNNING) {
				/* gsquery <- gsquery && mark */
				if (!mark)
					ma->mca_flags &= ~MAF_GSQUERY;
			} else {
				/* gsquery <- mark */
				if (mark)
					ma->mca_flags |= MAF_GSQUERY;
				else
					ma->mca_flags &= ~MAF_GSQUERY;
			}
1379
			if (!(ma->mca_flags & MAF_GSQUERY) ||
1380
			    mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1381
				igmp6_group_queried(ma, max_delay);
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			spin_unlock_bh(&ma->mca_lock);
1383
			break;
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		}
	}
	read_unlock_bh(&idev->lock);

	return 0;
}

1391
/* called with rcu_read_lock() */
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int igmp6_event_report(struct sk_buff *skb)
{
	struct ifmcaddr6 *ma;
	struct inet6_dev *idev;
1396
	struct mld_msg *mld;
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	int addr_type;

	/* Our own report looped back. Ignore it. */
	if (skb->pkt_type == PACKET_LOOPBACK)
		return 0;

1403 1404 1405 1406 1407
	/* send our report if the MC router may not have heard this report */
	if (skb->pkt_type != PACKET_MULTICAST &&
	    skb->pkt_type != PACKET_BROADCAST)
		return 0;

1408
	if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
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		return -EINVAL;

1411
	mld = (struct mld_msg *)icmp6_hdr(skb);
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	/* Drop reports with not link local source */
1414
	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1415
	if (addr_type != IPV6_ADDR_ANY &&
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	    !(addr_type&IPV6_ADDR_LINKLOCAL))
		return -EINVAL;

1419
	idev = __in6_dev_get(skb->dev);
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	if (idev == NULL)
		return -ENODEV;

	/*
	 *	Cancel the timer for this group
	 */

	read_lock_bh(&idev->lock);
	for (ma = idev->mc_list; ma; ma=ma->next) {
1429
		if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
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			spin_lock(&ma->mca_lock);
			if (del_timer(&ma->mca_timer))
				atomic_dec(&ma->mca_refcnt);
			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
			spin_unlock(&ma->mca_lock);
			break;
		}
	}
	read_unlock_bh(&idev->lock);
	return 0;
}

1442 1443
static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
		  int gdeleted, int sdeleted)
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{
	switch (type) {
	case MLD2_MODE_IS_INCLUDE:
	case MLD2_MODE_IS_EXCLUDE:
		if (gdeleted || sdeleted)
1449
			return false;
1450 1451
		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
			if (pmc->mca_sfmode == MCAST_INCLUDE)
1452
				return true;
1453 1454 1455 1456
			/* don't include if this source is excluded
			 * in all filters
			 */
			if (psf->sf_count[MCAST_INCLUDE])
1457
				return type == MLD2_MODE_IS_INCLUDE;
1458 1459 1460
			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
				psf->sf_count[MCAST_EXCLUDE];
		}
1461
		return false;
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	case MLD2_CHANGE_TO_INCLUDE:
		if (gdeleted || sdeleted)
1464
			return false;
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		return psf->sf_count[MCAST_INCLUDE] != 0;
	case MLD2_CHANGE_TO_EXCLUDE:
		if (gdeleted || sdeleted)
1468
			return false;
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		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
		    psf->sf_count[MCAST_INCLUDE])
1471
			return false;
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		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
			psf->sf_count[MCAST_EXCLUDE];
	case MLD2_ALLOW_NEW_SOURCES:
		if (gdeleted || !psf->sf_crcount)
1476
			return false;
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		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
	case MLD2_BLOCK_OLD_SOURCES:
		if (pmc->mca_sfmode == MCAST_INCLUDE)
			return gdeleted || (psf->sf_crcount && sdeleted);
		return psf->sf_crcount && !gdeleted && !sdeleted;
	}
1483
	return false;
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}

static int
mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
{
	struct ip6_sf_list *psf;
	int scount = 0;

	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
			continue;
		scount++;
	}
	return scount;
}

1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
		       struct net_device *dev,
		       const struct in6_addr *saddr,
		       const struct in6_addr *daddr,
		       int proto, int len)
{
	struct ipv6hdr *hdr;

	skb->protocol = htons(ETH_P_IPV6);
	skb->dev = dev;

	skb_reset_network_header(skb);
	skb_put(skb, sizeof(struct ipv6hdr));
	hdr = ipv6_hdr(skb);

	ip6_flow_hdr(hdr, 0, 0);

	hdr->payload_len = htons(len);
	hdr->nexthdr = proto;
	hdr->hop_limit = inet6_sk(sk)->hop_limit;

	hdr->saddr = *saddr;
	hdr->daddr = *daddr;
}

1525
static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
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{
1527
	struct net_device *dev = idev->dev;
1528
	struct net *net = dev_net(dev);
1529
	struct sock *sk = net->ipv6.igmp_sk;
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	struct sk_buff *skb;
	struct mld2_report *pmr;
	struct in6_addr addr_buf;
1533
	const struct in6_addr *saddr;
1534 1535
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;
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	int err;
	u8 ra[8] = { IPPROTO_ICMPV6, 0,
		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
		     IPV6_TLV_PADN, 0 };

	/* we assume size > sizeof(ra) here */
1542
	size += hlen + tlen;
1543 1544 1545
	/* limit our allocations to order-0 page */
	size = min_t(int, size, SKB_MAX_ORDER(0, 0));
	skb = sock_alloc_send_skb(sk, size, 1, &err);
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1547
	if (!skb)
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		return NULL;

1550
	skb->priority = TC_PRIO_CONTROL;
1551
	skb_reserve(skb, hlen);
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1553
	if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
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		/* <draft-ietf-magma-mld-source-05.txt>:
1555
		 * use unspecified address as the source address
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		 * when a valid link-local address is not available.
		 */
1558 1559 1560
		saddr = &in6addr_any;
	} else
		saddr = &addr_buf;
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1562
	ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
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	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));

1566
	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1567 1568
	skb_put(skb, sizeof(*pmr));
	pmr = (struct mld2_report *)skb_transport_header(skb);
1569 1570 1571 1572 1573
	pmr->mld2r_type = ICMPV6_MLD2_REPORT;
	pmr->mld2r_resv1 = 0;
	pmr->mld2r_cksum = 0;
	pmr->mld2r_resv2 = 0;
	pmr->mld2r_ngrec = 0;
L
Linus Torvalds 已提交
1574 1575 1576 1577 1578
	return skb;
}

static void mld_sendpack(struct sk_buff *skb)
{
1579
	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1580 1581
	struct mld2_report *pmr =
			      (struct mld2_report *)skb_transport_header(skb);
L
Linus Torvalds 已提交
1582
	int payload_len, mldlen;
1583
	struct inet6_dev *idev;
1584
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1585
	int err;
1586
	struct flowi6 fl6;
E
Eric Dumazet 已提交
1587
	struct dst_entry *dst;
L
Linus Torvalds 已提交
1588

1589 1590
	rcu_read_lock();
	idev = __in6_dev_get(skb->dev);
1591 1592
	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);

1593 1594 1595
	payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
		sizeof(*pip6);
	mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
L
Linus Torvalds 已提交
1596 1597
	pip6->payload_len = htons(payload_len);

1598 1599 1600 1601
	pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
					   IPPROTO_ICMPV6,
					   csum_partial(skb_transport_header(skb),
							mldlen, 0));
1602

1603
	icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1604 1605
			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
			 skb->dev->ifindex);
1606
	dst = icmp6_dst_alloc(skb->dev, &fl6);
1607

1608 1609 1610 1611 1612
	err = 0;
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
		dst = NULL;
	}
E
Eric Dumazet 已提交
1613
	skb_dst_set(skb, dst);
1614 1615 1616
	if (err)
		goto err_out;

1617 1618
	payload_len = skb->len;

1619
	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1620 1621
		      dst_output);
out:
L
Linus Torvalds 已提交
1622
	if (!err) {
1623
		ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1624
		ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1625
		IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
L
Linus Torvalds 已提交
1626
	} else
1627
		IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
L
Linus Torvalds 已提交
1628

1629
	rcu_read_unlock();
1630 1631 1632 1633 1634
	return;

err_out:
	kfree_skb(skb);
	goto out;
L
Linus Torvalds 已提交
1635 1636 1637 1638
}

static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
{
1639
	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
L
Linus Torvalds 已提交
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
}

static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
	int type, struct mld2_grec **ppgr)
{
	struct net_device *dev = pmc->idev->dev;
	struct mld2_report *pmr;
	struct mld2_grec *pgr;

	if (!skb)
1650
		skb = mld_newpack(pmc->idev, dev->mtu);
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655 1656 1657
	if (!skb)
		return NULL;
	pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
	pgr->grec_type = type;
	pgr->grec_auxwords = 0;
	pgr->grec_nsrcs = 0;
	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1658
	pmr = (struct mld2_report *)skb_transport_header(skb);
1659
	pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
L
Linus Torvalds 已提交
1660 1661 1662 1663 1664 1665 1666 1667
	*ppgr = pgr;
	return skb;
}

#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
	skb_tailroom(skb)) : 0)

static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1668
	int type, int gdeleted, int sdeleted, int crsend)
L
Linus Torvalds 已提交
1669
{
1670 1671
	struct inet6_dev *idev = pmc->idev;
	struct net_device *dev = idev->dev;
L
Linus Torvalds 已提交
1672 1673 1674
	struct mld2_report *pmr;
	struct mld2_grec *pgr = NULL;
	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1675
	int scount, stotal, first, isquery, truncate;
L
Linus Torvalds 已提交
1676 1677 1678 1679 1680 1681 1682 1683 1684

	if (pmc->mca_flags & MAF_NOREPORT)
		return skb;

	isquery = type == MLD2_MODE_IS_INCLUDE ||
		  type == MLD2_MODE_IS_EXCLUDE;
	truncate = type == MLD2_MODE_IS_EXCLUDE ||
		    type == MLD2_CHANGE_TO_EXCLUDE;

1685 1686
	stotal = scount = 0;

L
Linus Torvalds 已提交
1687 1688
	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;

1689 1690 1691
	if (!*psf_list)
		goto empty_source;

1692
	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
L
Linus Torvalds 已提交
1693 1694 1695

	/* EX and TO_EX get a fresh packet, if needed */
	if (truncate) {
1696
		if (pmr && pmr->mld2r_ngrec &&
L
Linus Torvalds 已提交
1697 1698 1699
		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
			if (skb)
				mld_sendpack(skb);
1700
			skb = mld_newpack(idev, dev->mtu);
L
Linus Torvalds 已提交
1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726
		}
	}
	first = 1;
	psf_prev = NULL;
	for (psf=*psf_list; psf; psf=psf_next) {
		struct in6_addr *psrc;

		psf_next = psf->sf_next;

		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
			psf_prev = psf;
			continue;
		}

		/* clear marks on query responses */
		if (isquery)
			psf->sf_gsresp = 0;

		if (AVAILABLE(skb) < sizeof(*psrc) +
		    first*sizeof(struct mld2_grec)) {
			if (truncate && !first)
				break;	 /* truncate these */
			if (pgr)
				pgr->grec_nsrcs = htons(scount);
			if (skb)
				mld_sendpack(skb);
1727
			skb = mld_newpack(idev, dev->mtu);
L
Linus Torvalds 已提交
1728 1729 1730 1731 1732 1733 1734
			first = 1;
			scount = 0;
		}
		if (first) {
			skb = add_grhead(skb, pmc, type, &pgr);
			first = 0;
		}
1735 1736
		if (!skb)
			return NULL;
L
Linus Torvalds 已提交
1737 1738
		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
		*psrc = psf->sf_addr;
1739
		scount++; stotal++;
L
Linus Torvalds 已提交
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753
		if ((type == MLD2_ALLOW_NEW_SOURCES ||
		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
			psf->sf_crcount--;
			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
				if (psf_prev)
					psf_prev->sf_next = psf->sf_next;
				else
					*psf_list = psf->sf_next;
				kfree(psf);
				continue;
			}
		}
		psf_prev = psf;
	}
1754 1755 1756 1757 1758 1759

empty_source:
	if (!stotal) {
		if (type == MLD2_ALLOW_NEW_SOURCES ||
		    type == MLD2_BLOCK_OLD_SOURCES)
			return skb;
1760
		if (pmc->mca_crcount || isquery || crsend) {
1761 1762 1763 1764 1765 1766 1767 1768
			/* make sure we have room for group header */
			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
				mld_sendpack(skb);
				skb = NULL; /* add_grhead will get a new one */
			}
			skb = add_grhead(skb, pmc, type, &pgr);
		}
	}
L
Linus Torvalds 已提交
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781
	if (pgr)
		pgr->grec_nsrcs = htons(scount);

	if (isquery)
		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
	return skb;
}

static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
{
	struct sk_buff *skb = NULL;
	int type;

1782
	read_lock_bh(&idev->lock);
L
Linus Torvalds 已提交
1783 1784 1785 1786 1787 1788 1789 1790 1791
	if (!pmc) {
		for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
			if (pmc->mca_flags & MAF_NOREPORT)
				continue;
			spin_lock_bh(&pmc->mca_lock);
			if (pmc->mca_sfcount[MCAST_EXCLUDE])
				type = MLD2_MODE_IS_EXCLUDE;
			else
				type = MLD2_MODE_IS_INCLUDE;
1792
			skb = add_grec(skb, pmc, type, 0, 0, 0);
L
Linus Torvalds 已提交
1793 1794 1795 1796 1797 1798 1799 1800
			spin_unlock_bh(&pmc->mca_lock);
		}
	} else {
		spin_lock_bh(&pmc->mca_lock);
		if (pmc->mca_sfcount[MCAST_EXCLUDE])
			type = MLD2_MODE_IS_EXCLUDE;
		else
			type = MLD2_MODE_IS_INCLUDE;
1801
		skb = add_grec(skb, pmc, type, 0, 0, 0);
L
Linus Torvalds 已提交
1802 1803
		spin_unlock_bh(&pmc->mca_lock);
	}
1804
	read_unlock_bh(&idev->lock);
L
Linus Torvalds 已提交
1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836
	if (skb)
		mld_sendpack(skb);
}

/*
 * remove zero-count source records from a source filter list
 */
static void mld_clear_zeros(struct ip6_sf_list **ppsf)
{
	struct ip6_sf_list *psf_prev, *psf_next, *psf;

	psf_prev = NULL;
	for (psf=*ppsf; psf; psf = psf_next) {
		psf_next = psf->sf_next;
		if (psf->sf_crcount == 0) {
			if (psf_prev)
				psf_prev->sf_next = psf->sf_next;
			else
				*ppsf = psf->sf_next;
			kfree(psf);
		} else
			psf_prev = psf;
	}
}

static void mld_send_cr(struct inet6_dev *idev)
{
	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
	struct sk_buff *skb = NULL;
	int type, dtype;

	read_lock_bh(&idev->lock);
1837
	spin_lock(&idev->mc_lock);
L
Linus Torvalds 已提交
1838 1839 1840 1841 1842 1843 1844 1845

	/* deleted MCA's */
	pmc_prev = NULL;
	for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
		pmc_next = pmc->next;
		if (pmc->mca_sfmode == MCAST_INCLUDE) {
			type = MLD2_BLOCK_OLD_SOURCES;
			dtype = MLD2_BLOCK_OLD_SOURCES;
1846 1847
			skb = add_grec(skb, pmc, type, 1, 0, 0);
			skb = add_grec(skb, pmc, dtype, 1, 1, 0);
L
Linus Torvalds 已提交
1848 1849 1850 1851
		}
		if (pmc->mca_crcount) {
			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
				type = MLD2_CHANGE_TO_INCLUDE;
1852
				skb = add_grec(skb, pmc, type, 1, 0, 0);
L
Linus Torvalds 已提交
1853
			}
1854
			pmc->mca_crcount--;
L
Linus Torvalds 已提交
1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
			if (pmc->mca_crcount == 0) {
				mld_clear_zeros(&pmc->mca_tomb);
				mld_clear_zeros(&pmc->mca_sources);
			}
		}
		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
		    !pmc->mca_sources) {
			if (pmc_prev)
				pmc_prev->next = pmc_next;
			else
				idev->mc_tomb = pmc_next;
			in6_dev_put(pmc->idev);
			kfree(pmc);
		} else
			pmc_prev = pmc;
	}
1871
	spin_unlock(&idev->mc_lock);
L
Linus Torvalds 已提交
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882

	/* change recs */
	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
		spin_lock_bh(&pmc->mca_lock);
		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
			type = MLD2_BLOCK_OLD_SOURCES;
			dtype = MLD2_ALLOW_NEW_SOURCES;
		} else {
			type = MLD2_ALLOW_NEW_SOURCES;
			dtype = MLD2_BLOCK_OLD_SOURCES;
		}
1883 1884
		skb = add_grec(skb, pmc, type, 0, 0, 0);
		skb = add_grec(skb, pmc, dtype, 0, 1, 0);	/* deleted sources */
L
Linus Torvalds 已提交
1885 1886 1887 1888 1889 1890 1891

		/* filter mode changes */
		if (pmc->mca_crcount) {
			if (pmc->mca_sfmode == MCAST_EXCLUDE)
				type = MLD2_CHANGE_TO_EXCLUDE;
			else
				type = MLD2_CHANGE_TO_INCLUDE;
1892
			skb = add_grec(skb, pmc, type, 0, 0, 0);
1893
			pmc->mca_crcount--;
L
Linus Torvalds 已提交
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
		}
		spin_unlock_bh(&pmc->mca_lock);
	}
	read_unlock_bh(&idev->lock);
	if (!skb)
		return;
	(void) mld_sendpack(skb);
}

static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
{
1905
	struct net *net = dev_net(dev);
1906
	struct sock *sk = net->ipv6.igmp_sk;
L
Linus Torvalds 已提交
1907
	struct inet6_dev *idev;
1908
	struct sk_buff *skb;
1909
	struct mld_msg *hdr;
1910
	const struct in6_addr *snd_addr, *saddr;
L
Linus Torvalds 已提交
1911
	struct in6_addr addr_buf;
1912 1913
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;
L
Linus Torvalds 已提交
1914 1915 1916 1917
	int err, len, payload_len, full_len;
	u8 ra[8] = { IPPROTO_ICMPV6, 0,
		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
		     IPV6_TLV_PADN, 0 };
1918
	struct flowi6 fl6;
E
Eric Dumazet 已提交
1919
	struct dst_entry *dst;
L
Linus Torvalds 已提交
1920

1921 1922 1923 1924
	if (type == ICMPV6_MGM_REDUCTION)
		snd_addr = &in6addr_linklocal_allrouters;
	else
		snd_addr = addr;
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929

	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
	payload_len = len + sizeof(ra);
	full_len = sizeof(struct ipv6hdr) + payload_len;

1930 1931 1932 1933 1934
	rcu_read_lock();
	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
		      IPSTATS_MIB_OUT, full_len);
	rcu_read_unlock();

1935
	skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
L
Linus Torvalds 已提交
1936 1937

	if (skb == NULL) {
1938
		rcu_read_lock();
1939
		IP6_INC_STATS(net, __in6_dev_get(dev),
1940 1941
			      IPSTATS_MIB_OUTDISCARDS);
		rcu_read_unlock();
L
Linus Torvalds 已提交
1942 1943
		return;
	}
1944
	skb->priority = TC_PRIO_CONTROL;
1945
	skb_reserve(skb, hlen);
L
Linus Torvalds 已提交
1946

1947
	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
L
Linus Torvalds 已提交
1948
		/* <draft-ietf-magma-mld-source-05.txt>:
1949
		 * use unspecified address as the source address
L
Linus Torvalds 已提交
1950 1951
		 * when a valid link-local address is not available.
		 */
1952 1953 1954
		saddr = &in6addr_any;
	} else
		saddr = &addr_buf;
L
Linus Torvalds 已提交
1955

1956
	ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
L
Linus Torvalds 已提交
1957 1958 1959

	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));

1960 1961 1962
	hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
	memset(hdr, 0, sizeof(struct mld_msg));
	hdr->mld_type = type;
1963
	hdr->mld_mca = *addr;
L
Linus Torvalds 已提交
1964

1965 1966 1967
	hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
					 IPPROTO_ICMPV6,
					 csum_partial(hdr, len, 0));
L
Linus Torvalds 已提交
1968

1969 1970
	rcu_read_lock();
	idev = __in6_dev_get(skb->dev);
L
Linus Torvalds 已提交
1971

1972
	icmpv6_flow_init(sk, &fl6, type,
1973 1974
			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
			 skb->dev->ifindex);
1975
	dst = icmp6_dst_alloc(skb->dev, &fl6);
1976 1977
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
1978
		goto err_out;
1979
	}
1980

E
Eric Dumazet 已提交
1981
	skb_dst_set(skb, dst);
1982
	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1983 1984
		      dst_output);
out:
L
Linus Torvalds 已提交
1985
	if (!err) {
1986
		ICMP6MSGOUT_INC_STATS(net, idev, type);
1987
		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1988
		IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
L
Linus Torvalds 已提交
1989
	} else
1990
		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
L
Linus Torvalds 已提交
1991

1992
	rcu_read_unlock();
L
Linus Torvalds 已提交
1993
	return;
1994 1995 1996 1997

err_out:
	kfree_skb(skb);
	goto out;
L
Linus Torvalds 已提交
1998 1999
}

2000
static void mld_send_initial_cr(struct inet6_dev *idev)
2001
{
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
	struct sk_buff *skb;
	struct ifmcaddr6 *pmc;
	int type;

	if (mld_in_v1_mode(idev))
		return;

	skb = NULL;
	read_lock_bh(&idev->lock);
	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
		spin_lock_bh(&pmc->mca_lock);
		if (pmc->mca_sfcount[MCAST_EXCLUDE])
			type = MLD2_CHANGE_TO_EXCLUDE;
		else
			type = MLD2_CHANGE_TO_INCLUDE;
		skb = add_grec(skb, pmc, type, 0, 0, 1);
		spin_unlock_bh(&pmc->mca_lock);
2019
	}
2020 2021 2022
	read_unlock_bh(&idev->lock);
	if (skb)
		mld_sendpack(skb);
2023 2024 2025 2026 2027 2028
}

void ipv6_mc_dad_complete(struct inet6_dev *idev)
{
	idev->mc_dad_count = idev->mc_qrv;
	if (idev->mc_dad_count) {
2029
		mld_send_initial_cr(idev);
2030 2031 2032 2033 2034 2035 2036 2037 2038 2039
		idev->mc_dad_count--;
		if (idev->mc_dad_count)
			mld_dad_start_timer(idev, idev->mc_maxdelay);
	}
}

static void mld_dad_timer_expire(unsigned long data)
{
	struct inet6_dev *idev = (struct inet6_dev *)data;

2040
	mld_send_initial_cr(idev);
2041 2042 2043 2044 2045
	if (idev->mc_dad_count) {
		idev->mc_dad_count--;
		if (idev->mc_dad_count)
			mld_dad_start_timer(idev, idev->mc_maxdelay);
	}
2046
	in6_dev_put(idev);
2047 2048
}

L
Linus Torvalds 已提交
2049
static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2050
	const struct in6_addr *psfsrc)
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{
	struct ip6_sf_list *psf, *psf_prev;
	int rv = 0;

	psf_prev = NULL;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
			break;
		psf_prev = psf;
	}
	if (!psf || psf->sf_count[sfmode] == 0) {
		/* source filter not found, or count wrong =>  bug */
		return -ESRCH;
	}
	psf->sf_count[sfmode]--;
	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
		struct inet6_dev *idev = pmc->idev;

		/* no more filters for this source */
		if (psf_prev)
			psf_prev->sf_next = psf->sf_next;
		else
			pmc->mca_sources = psf->sf_next;
		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
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		    !mld_in_v1_mode(idev)) {
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			psf->sf_crcount = idev->mc_qrv;
			psf->sf_next = pmc->mca_tomb;
			pmc->mca_tomb = psf;
			rv = 1;
		} else
			kfree(psf);
	}
	return rv;
}

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static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
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			  int delta)
{
	struct ifmcaddr6 *pmc;
	int	changerec = 0;
	int	i, err;

	if (!idev)
		return -ENODEV;
	read_lock_bh(&idev->lock);
	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		read_unlock_bh(&idev->lock);
		return -ESRCH;
	}
	spin_lock_bh(&pmc->mca_lock);
	sf_markstate(pmc);
	if (!delta) {
		if (!pmc->mca_sfcount[sfmode]) {
			spin_unlock_bh(&pmc->mca_lock);
			read_unlock_bh(&idev->lock);
			return -EINVAL;
		}
		pmc->mca_sfcount[sfmode]--;
	}
	err = 0;
	for (i=0; i<sfcount; i++) {
		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);

		changerec |= rv > 0;
		if (!err && rv < 0)
			err = rv;
	}
	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
	    pmc->mca_sfcount[MCAST_INCLUDE]) {
		struct ip6_sf_list *psf;

		/* filter mode change */
		pmc->mca_sfmode = MCAST_INCLUDE;
		pmc->mca_crcount = idev->mc_qrv;
		idev->mc_ifc_count = pmc->mca_crcount;
		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		mld_ifc_event(pmc->idev);
	} else if (sf_setstate(pmc) || changerec)
		mld_ifc_event(pmc->idev);
	spin_unlock_bh(&pmc->mca_lock);
	read_unlock_bh(&idev->lock);
	return err;
}

/*
 * Add multicast single-source filter to the interface list
 */
static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
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	const struct in6_addr *psfsrc)
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{
	struct ip6_sf_list *psf, *psf_prev;

	psf_prev = NULL;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
			break;
		psf_prev = psf;
	}
	if (!psf) {
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		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
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		if (!psf)
			return -ENOBUFS;
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		psf->sf_addr = *psfsrc;
		if (psf_prev) {
			psf_prev->sf_next = psf;
		} else
			pmc->mca_sources = psf;
	}
	psf->sf_count[sfmode]++;
	return 0;
}

static void sf_markstate(struct ifmcaddr6 *pmc)
{
	struct ip6_sf_list *psf;
	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];

	for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
			psf->sf_oldin = mca_xcount ==
				psf->sf_count[MCAST_EXCLUDE] &&
				!psf->sf_count[MCAST_INCLUDE];
		} else
			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
}

static int sf_setstate(struct ifmcaddr6 *pmc)
{
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	struct ip6_sf_list *psf, *dpsf;
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	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
	int qrv = pmc->idev->mc_qrv;
	int new_in, rv;

	rv = 0;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
				!psf->sf_count[MCAST_INCLUDE];
		} else
			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
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		if (new_in) {
			if (!psf->sf_oldin) {
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				struct ip6_sf_list *prev = NULL;
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				for (dpsf=pmc->mca_tomb; dpsf;
				     dpsf=dpsf->sf_next) {
					if (ipv6_addr_equal(&dpsf->sf_addr,
					    &psf->sf_addr))
						break;
					prev = dpsf;
				}
				if (dpsf) {
					if (prev)
						prev->sf_next = dpsf->sf_next;
					else
						pmc->mca_tomb = dpsf->sf_next;
					kfree(dpsf);
				}
				psf->sf_crcount = qrv;
				rv++;
			}
		} else if (psf->sf_oldin) {
			psf->sf_crcount = 0;
			/*
			 * add or update "delete" records if an active filter
			 * is now inactive
			 */
			for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
				if (ipv6_addr_equal(&dpsf->sf_addr,
				    &psf->sf_addr))
					break;
			if (!dpsf) {
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				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
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				if (!dpsf)
					continue;
				*dpsf = *psf;
				/* pmc->mca_lock held by callers */
				dpsf->sf_next = pmc->mca_tomb;
				pmc->mca_tomb = dpsf;
			}
			dpsf->sf_crcount = qrv;
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			rv++;
		}
	}
	return rv;
}

/*
 * Add multicast source filter list to the interface list
 */
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static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
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			  int delta)
{
	struct ifmcaddr6 *pmc;
	int	isexclude;
	int	i, err;

	if (!idev)
		return -ENODEV;
	read_lock_bh(&idev->lock);
	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		read_unlock_bh(&idev->lock);
		return -ESRCH;
	}
	spin_lock_bh(&pmc->mca_lock);

	sf_markstate(pmc);
	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
	if (!delta)
		pmc->mca_sfcount[sfmode]++;
	err = 0;
	for (i=0; i<sfcount; i++) {
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		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
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		if (err)
			break;
	}
	if (err) {
		int j;

		if (!delta)
			pmc->mca_sfcount[sfmode]--;
		for (j=0; j<i; j++)
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			ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
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	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
		struct ip6_sf_list *psf;

		/* filter mode change */
		if (pmc->mca_sfcount[MCAST_EXCLUDE])
			pmc->mca_sfmode = MCAST_EXCLUDE;
		else if (pmc->mca_sfcount[MCAST_INCLUDE])
			pmc->mca_sfmode = MCAST_INCLUDE;
		/* else no filters; keep old mode for reports */

		pmc->mca_crcount = idev->mc_qrv;
		idev->mc_ifc_count = pmc->mca_crcount;
		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		mld_ifc_event(idev);
	} else if (sf_setstate(pmc))
		mld_ifc_event(idev);
	spin_unlock_bh(&pmc->mca_lock);
	read_unlock_bh(&idev->lock);
	return err;
}

static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
{
	struct ip6_sf_list *psf, *nextpsf;

	for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
	pmc->mca_tomb = NULL;
	for (psf=pmc->mca_sources; psf; psf=nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
	pmc->mca_sources = NULL;
	pmc->mca_sfmode = MCAST_EXCLUDE;
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	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
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	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
}


static void igmp6_join_group(struct ifmcaddr6 *ma)
{
	unsigned long delay;

	if (ma->mca_flags & MAF_NOREPORT)
		return;

	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);

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	delay = prandom_u32() % unsolicited_report_interval(ma->idev);
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	spin_lock_bh(&ma->mca_lock);
	if (del_timer(&ma->mca_timer)) {
		atomic_dec(&ma->mca_refcnt);
		delay = ma->mca_timer.expires - jiffies;
	}

	if (!mod_timer(&ma->mca_timer, jiffies + delay))
		atomic_inc(&ma->mca_refcnt);
	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
	spin_unlock_bh(&ma->mca_lock);
}

static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
			    struct inet6_dev *idev)
{
	int err;

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	/* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
	 * so no other readers or writers of iml or its sflist
	 */
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	if (!iml->sflist) {
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		/* any-source empty exclude case */
		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
	}
	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
	iml->sflist = NULL;
	return err;
}

static void igmp6_leave_group(struct ifmcaddr6 *ma)
{
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	if (mld_in_v1_mode(ma->idev)) {
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		if (ma->mca_flags & MAF_LAST_REPORTER)
			igmp6_send(&ma->mca_addr, ma->idev->dev,
				ICMPV6_MGM_REDUCTION);
	} else {
		mld_add_delrec(ma->idev, ma);
		mld_ifc_event(ma->idev);
	}
}

static void mld_gq_timer_expire(unsigned long data)
{
	struct inet6_dev *idev = (struct inet6_dev *)data;

	idev->mc_gq_running = 0;
	mld_send_report(idev, NULL);
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	in6_dev_put(idev);
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}

static void mld_ifc_timer_expire(unsigned long data)
{
	struct inet6_dev *idev = (struct inet6_dev *)data;

	mld_send_cr(idev);
	if (idev->mc_ifc_count) {
		idev->mc_ifc_count--;
		if (idev->mc_ifc_count)
			mld_ifc_start_timer(idev, idev->mc_maxdelay);
	}
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	in6_dev_put(idev);
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}

static void mld_ifc_event(struct inet6_dev *idev)
{
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	if (mld_in_v1_mode(idev))
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		return;
	idev->mc_ifc_count = idev->mc_qrv;
	mld_ifc_start_timer(idev, 1);
}


static void igmp6_timer_handler(unsigned long data)
{
	struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;

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	if (mld_in_v1_mode(ma->idev))
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		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
	else
		mld_send_report(ma->idev, ma);

	spin_lock(&ma->mca_lock);
	ma->mca_flags |=  MAF_LAST_REPORTER;
	ma->mca_flags &= ~MAF_TIMER_RUNNING;
	spin_unlock(&ma->mca_lock);
	ma_put(ma);
}

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/* Device changing type */

void ipv6_mc_unmap(struct inet6_dev *idev)
{
	struct ifmcaddr6 *i;

	/* Install multicast list, except for all-nodes (already installed) */

	read_lock_bh(&idev->lock);
	for (i = idev->mc_list; i; i = i->next)
		igmp6_group_dropped(i);
	read_unlock_bh(&idev->lock);
}

void ipv6_mc_remap(struct inet6_dev *idev)
{
	ipv6_mc_up(idev);
}

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/* Device going down */

void ipv6_mc_down(struct inet6_dev *idev)
{
	struct ifmcaddr6 *i;

	/* Withdraw multicast list */

	read_lock_bh(&idev->lock);
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	mld_ifc_stop_timer(idev);
	mld_gq_stop_timer(idev);
	mld_dad_stop_timer(idev);
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	for (i = idev->mc_list; i; i=i->next)
		igmp6_group_dropped(i);
	read_unlock_bh(&idev->lock);

	mld_clear_delrec(idev);
}


/* Device going up */

void ipv6_mc_up(struct inet6_dev *idev)
{
	struct ifmcaddr6 *i;

	/* Install multicast list, except for all-nodes (already installed) */

	read_lock_bh(&idev->lock);
	for (i = idev->mc_list; i; i=i->next)
		igmp6_group_added(i);
	read_unlock_bh(&idev->lock);
}

/* IPv6 device initialization. */

void ipv6_mc_init_dev(struct inet6_dev *idev)
{
	write_lock_bh(&idev->lock);
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	spin_lock_init(&idev->mc_lock);
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	idev->mc_gq_running = 0;
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	setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
			(unsigned long)idev);
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	idev->mc_tomb = NULL;
	idev->mc_ifc_count = 0;
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	setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
			(unsigned long)idev);
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	setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
		    (unsigned long)idev);
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	idev->mc_qrv = MLD_QRV_DEFAULT;
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	idev->mc_qi = MLD_QI_DEFAULT;
	idev->mc_qri = MLD_QRI_DEFAULT;

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	idev->mc_maxdelay = unsolicited_report_interval(idev);
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	idev->mc_v1_seen = 0;
	write_unlock_bh(&idev->lock);
}

/*
 *	Device is about to be destroyed: clean up.
 */

void ipv6_mc_destroy_dev(struct inet6_dev *idev)
{
	struct ifmcaddr6 *i;

	/* Deactivate timers */
	ipv6_mc_down(idev);

	/* Delete all-nodes address. */
	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
	 * fail.
	 */
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	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
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	if (idev->cnf.forwarding)
		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
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	write_lock_bh(&idev->lock);
	while ((i = idev->mc_list) != NULL) {
		idev->mc_list = i->next;
		write_unlock_bh(&idev->lock);

		igmp6_group_dropped(i);
		ma_put(i);

		write_lock_bh(&idev->lock);
	}
	write_unlock_bh(&idev->lock);
}

#ifdef CONFIG_PROC_FS
struct igmp6_mc_iter_state {
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	struct seq_net_private p;
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	struct net_device *dev;
	struct inet6_dev *idev;
};

#define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)

static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
{
	struct ifmcaddr6 *im = NULL;
	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
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	struct net *net = seq_file_net(seq);
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	state->idev = NULL;
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	for_each_netdev_rcu(net, state->dev) {
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		struct inet6_dev *idev;
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		idev = __in6_dev_get(state->dev);
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		if (!idev)
			continue;
		read_lock_bh(&idev->lock);
		im = idev->mc_list;
		if (im) {
			state->idev = idev;
			break;
		}
		read_unlock_bh(&idev->lock);
	}
	return im;
}

static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
{
	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);

	im = im->next;
	while (!im) {
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		if (likely(state->idev != NULL))
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			read_unlock_bh(&state->idev->lock);
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		state->dev = next_net_device_rcu(state->dev);
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		if (!state->dev) {
			state->idev = NULL;
			break;
		}
2591
		state->idev = __in6_dev_get(state->dev);
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		if (!state->idev)
			continue;
		read_lock_bh(&state->idev->lock);
		im = state->idev->mc_list;
	}
	return im;
}

static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
	if (im)
		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
			--pos;
	return pos ? NULL : im;
}

static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2610
	__acquires(RCU)
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2611
{
2612
	rcu_read_lock();
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	return igmp6_mc_get_idx(seq, *pos);
}

static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2618 2619
	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);

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	++*pos;
	return im;
}

static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2625
	__releases(RCU)
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2626 2627
{
	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2628

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2629 2630 2631 2632 2633
	if (likely(state->idev != NULL)) {
		read_unlock_bh(&state->idev->lock);
		state->idev = NULL;
	}
	state->dev = NULL;
2634
	rcu_read_unlock();
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}

static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
{
	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);

	seq_printf(seq,
2643
		   "%-4d %-15s %pi6 %5d %08X %ld\n",
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		   state->dev->ifindex, state->dev->name,
2645
		   &im->mca_addr,
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		   im->mca_users, im->mca_flags,
		   (im->mca_flags&MAF_TIMER_RUNNING) ?
		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
	return 0;
}

2652
static const struct seq_operations igmp6_mc_seq_ops = {
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	.start	=	igmp6_mc_seq_start,
	.next	=	igmp6_mc_seq_next,
	.stop	=	igmp6_mc_seq_stop,
	.show	=	igmp6_mc_seq_show,
};

static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
{
2661 2662
	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
			    sizeof(struct igmp6_mc_iter_state));
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}

2665
static const struct file_operations igmp6_mc_seq_fops = {
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	.owner		=	THIS_MODULE,
	.open		=	igmp6_mc_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2670
	.release	=	seq_release_net,
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};

struct igmp6_mcf_iter_state {
2674
	struct seq_net_private p;
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	struct net_device *dev;
	struct inet6_dev *idev;
	struct ifmcaddr6 *im;
};

#define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)

static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
{
	struct ip6_sf_list *psf = NULL;
	struct ifmcaddr6 *im = NULL;
	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2687
	struct net *net = seq_file_net(seq);
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2688

2689 2690
	state->idev = NULL;
	state->im = NULL;
2691
	for_each_netdev_rcu(net, state->dev) {
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2692
		struct inet6_dev *idev;
2693
		idev = __in6_dev_get(state->dev);
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		if (unlikely(idev == NULL))
			continue;
		read_lock_bh(&idev->lock);
		im = idev->mc_list;
		if (likely(im != NULL)) {
			spin_lock_bh(&im->mca_lock);
			psf = im->mca_sources;
			if (likely(psf != NULL)) {
				state->im = im;
				state->idev = idev;
				break;
			}
			spin_unlock_bh(&im->mca_lock);
		}
		read_unlock_bh(&idev->lock);
	}
	return psf;
}

static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
{
	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);

	psf = psf->sf_next;
	while (!psf) {
		spin_unlock_bh(&state->im->mca_lock);
		state->im = state->im->next;
		while (!state->im) {
2722
			if (likely(state->idev != NULL))
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				read_unlock_bh(&state->idev->lock);
2724 2725

			state->dev = next_net_device_rcu(state->dev);
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			if (!state->dev) {
				state->idev = NULL;
				goto out;
			}
2730
			state->idev = __in6_dev_get(state->dev);
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2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754
			if (!state->idev)
				continue;
			read_lock_bh(&state->idev->lock);
			state->im = state->idev->mc_list;
		}
		if (!state->im)
			break;
		spin_lock_bh(&state->im->mca_lock);
		psf = state->im->mca_sources;
	}
out:
	return psf;
}

static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
	if (psf)
		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
			--pos;
	return pos ? NULL : psf;
}

static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2755
	__acquires(RCU)
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2756
{
2757
	rcu_read_lock();
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	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip6_sf_list *psf;
	if (v == SEQ_START_TOKEN)
		psf = igmp6_mcf_get_first(seq);
	else
		psf = igmp6_mcf_get_next(seq, v);
	++*pos;
	return psf;
}

static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2773
	__releases(RCU)
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2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
{
	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
	if (likely(state->im != NULL)) {
		spin_unlock_bh(&state->im->mca_lock);
		state->im = NULL;
	}
	if (likely(state->idev != NULL)) {
		read_unlock_bh(&state->idev->lock);
		state->idev = NULL;
	}
	state->dev = NULL;
2785
	rcu_read_unlock();
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}

static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
{
	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);

	if (v == SEQ_START_TOKEN) {
2794
		seq_printf(seq,
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2795
			   "%3s %6s "
2796
			   "%32s %32s %6s %6s\n", "Idx",
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			   "Device", "Multicast Address",
			   "Source Address", "INC", "EXC");
	} else {
		seq_printf(seq,
2801
			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
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2802
			   state->dev->ifindex, state->dev->name,
2803 2804
			   &state->im->mca_addr,
			   &psf->sf_addr,
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			   psf->sf_count[MCAST_INCLUDE],
			   psf->sf_count[MCAST_EXCLUDE]);
	}
	return 0;
}

2811
static const struct seq_operations igmp6_mcf_seq_ops = {
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	.start	=	igmp6_mcf_seq_start,
	.next	=	igmp6_mcf_seq_next,
	.stop	=	igmp6_mcf_seq_stop,
	.show	=	igmp6_mcf_seq_show,
};

static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
{
2820 2821
	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
			    sizeof(struct igmp6_mcf_iter_state));
L
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2822 2823
}

2824
static const struct file_operations igmp6_mcf_seq_fops = {
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2825 2826 2827 2828
	.owner		=	THIS_MODULE,
	.open		=	igmp6_mcf_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2829
	.release	=	seq_release_net,
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2830
};
2831

2832
static int __net_init igmp6_proc_init(struct net *net)
2833 2834 2835 2836
{
	int err;

	err = -ENOMEM;
2837
	if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2838
		goto out;
2839 2840
	if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
			 &igmp6_mcf_seq_fops))
2841 2842 2843 2844 2845 2846 2847
		goto out_proc_net_igmp6;

	err = 0;
out:
	return err;

out_proc_net_igmp6:
2848
	remove_proc_entry("igmp6", net->proc_net);
2849 2850 2851
	goto out;
}

2852
static void __net_exit igmp6_proc_exit(struct net *net)
2853
{
2854 2855
	remove_proc_entry("mcfilter6", net->proc_net);
	remove_proc_entry("igmp6", net->proc_net);
2856 2857
}
#else
2858
static inline int igmp6_proc_init(struct net *net)
2859 2860 2861
{
	return 0;
}
2862
static inline void igmp6_proc_exit(struct net *net)
2863 2864
{
}
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#endif

2867
static int __net_init igmp6_net_init(struct net *net)
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{
	int err;

2871 2872
	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
				   SOCK_RAW, IPPROTO_ICMPV6, net);
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2873
	if (err < 0) {
2874
		pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
L
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2875
		       err);
2876
		goto out;
L
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2877 2878
	}

2879
	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
L
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2880

2881 2882
	err = igmp6_proc_init(net);
	if (err)
2883 2884 2885 2886 2887
		goto out_sock_create;
out:
	return err;

out_sock_create:
2888
	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2889
	goto out;
L
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2890 2891
}

2892
static void __net_exit igmp6_net_exit(struct net *net)
L
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2893
{
2894
	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2895
	igmp6_proc_exit(net);
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2896
}
2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911

static struct pernet_operations igmp6_net_ops = {
	.init = igmp6_net_init,
	.exit = igmp6_net_exit,
};

int __init igmp6_init(void)
{
	return register_pernet_subsys(&igmp6_net_ops);
}

void igmp6_cleanup(void)
{
	unregister_pernet_subsys(&igmp6_net_ops);
}
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