mcast.c 63.2 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>

#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

/*
 *  These header formats should be in a separate include file, but icmpv6.h
 *  doesn't have in6_addr defined in all cases, there is no __u128, and no
 *  other files reference these.
 *
 *  			+-DLS 4/14/03
 */

/* Multicast Listener Discovery version 2 headers */

struct mld2_grec {
	__u8		grec_type;
	__u8		grec_auxwords;
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	__be16		grec_nsrcs;
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	struct in6_addr	grec_mca;
	struct in6_addr	grec_src[0];
};

struct mld2_report {
	__u8	type;
	__u8	resv1;
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	__sum16	csum;
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	__be16	resv2;
	__be16	ngrec;
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	struct mld2_grec grec[0];
};

struct mld2_query {
	__u8 type;
	__u8 code;
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	__sum16 csum;
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	__be16 mrc;
	__be16 resv1;
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	struct in6_addr mca;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u8 qrv:3,
	     suppress:1,
	     resv2:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u8 resv2:4,
	     suppress:1,
	     qrv:3;
#else
#error "Please fix <asm/byteorder.h>"
#endif
	__u8 qqic;
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	__be16 nsrcs;
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	struct in6_addr srcs[0];
};

static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;

/* Big mc list lock for all the sockets */
static DEFINE_RWLOCK(ipv6_sk_mc_lock);

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);
static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
static void mld_clear_delrec(struct inet6_dev *idev);
static int sf_setstate(struct ifmcaddr6 *pmc);
static void sf_markstate(struct ifmcaddr6 *pmc);
static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
			  int sfmode, int sfcount, struct in6_addr *psfsrc,
			  int delta);
static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
			  int sfmode, int sfcount, struct in6_addr *psfsrc,
			  int delta);
static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
			    struct inet6_dev *idev);


#define IGMP6_UNSOLICITED_IVAL	(10*HZ)
#define MLD_QRV_DEFAULT		2

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#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
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		(idev)->cnf.force_mld_version == 1 || \
		((idev)->mc_v1_seen && \
		time_before(jiffies, (idev)->mc_v1_seen)))

#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
	((value) < (thresh) ? (value) : \
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	((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
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	(MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))

#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)

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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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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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	read_lock_bh(&ipv6_sk_mc_lock);
	for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
		    ipv6_addr_equal(&mc_lst->addr, addr)) {
			read_unlock_bh(&ipv6_sk_mc_lock);
			return -EADDRINUSE;
		}
	}
	read_unlock_bh(&ipv6_sk_mc_lock);

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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;
	ipv6_addr_copy(&mc_lst->addr, addr);

	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) {
			dev = rt->rt6i_dev;
			dev_hold(dev);
			dst_release(&rt->u.dst);
		}
	} else
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		dev = dev_get_by_index(net, ifindex);
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	if (dev == NULL) {
		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) {
		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
		dev_put(dev);
		return err;
	}

	write_lock_bh(&ipv6_sk_mc_lock);
	mc_lst->next = np->ipv6_mc_list;
	np->ipv6_mc_list = mc_lst;
	write_unlock_bh(&ipv6_sk_mc_lock);

	dev_put(dev);

	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);
	struct ipv6_mc_socklist *mc_lst, **lnk;
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	struct net *net = sock_net(sk);
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	write_lock_bh(&ipv6_sk_mc_lock);
	for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
		    ipv6_addr_equal(&mc_lst->addr, addr)) {
			struct net_device *dev;

			*lnk = mc_lst->next;
			write_unlock_bh(&ipv6_sk_mc_lock);

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			dev = dev_get_by_index(net, mc_lst->ifindex);
			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) {
					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
					in6_dev_put(idev);
				}
				dev_put(dev);
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			} else
				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
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			sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
			return 0;
		}
	}
	write_unlock_bh(&ipv6_sk_mc_lock);

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	return -EADDRNOTAVAIL;
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}

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static struct inet6_dev *ip6_mc_find_dev(struct net *net,
					 struct in6_addr *group,
					 int ifindex)
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{
	struct net_device *dev = NULL;
	struct inet6_dev *idev = NULL;

	if (ifindex == 0) {
		struct rt6_info *rt;

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		rt = rt6_lookup(net, group, NULL, 0, 0);
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		if (rt) {
			dev = rt->rt6i_dev;
			dev_hold(dev);
			dst_release(&rt->u.dst);
		}
	} else
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		dev = dev_get_by_index(net, ifindex);
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	if (!dev)
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		goto nodev;
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	idev = in6_dev_get(dev);
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	if (!idev)
		goto release;
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	read_lock_bh(&idev->lock);
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	if (idev->dead)
		goto unlock_release;

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	return idev;
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unlock_release:
	read_unlock_bh(&idev->lock);
	in6_dev_put(idev);
release:
	dev_put(dev);
nodev:
	return NULL;
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}

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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	write_lock_bh(&ipv6_sk_mc_lock);
	while ((mc_lst = np->ipv6_mc_list) != NULL) {
		struct net_device *dev;

		np->ipv6_mc_list = mc_lst->next;
		write_unlock_bh(&ipv6_sk_mc_lock);

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		dev = dev_get_by_index(net, mc_lst->ifindex);
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		if (dev) {
			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) {
				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
				in6_dev_put(idev);
			}
			dev_put(dev);
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		} else
			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
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		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));

		write_lock_bh(&ipv6_sk_mc_lock);
	}
	write_unlock_bh(&ipv6_sk_mc_lock);
}

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 net_device *dev;
	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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	idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
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	if (!idev)
		return -ENODEV;
	dev = idev->dev;

	err = -EADDRNOTAVAIL;

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	read_lock_bh(&ipv6_sk_mc_lock);
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	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
		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_bh(&pmc->sflock);
	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++) {
			rv = memcmp(&psl->sl_addr[i], source,
				sizeof(struct in6_addr));
			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++) {
		rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
		if (rv == 0)
			break;
	}
	if (rv == 0)		/* address already there is an error */
		goto done;
	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)
		write_unlock_bh(&pmc->sflock);
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	read_unlock_bh(&ipv6_sk_mc_lock);
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	read_unlock_bh(&idev->lock);
	in6_dev_put(idev);
	dev_put(dev);
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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)
{
	struct in6_addr *group;
	struct ipv6_mc_socklist *pmc;
	struct net_device *dev;
	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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	idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
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	if (!idev)
		return -ENODEV;
	dev = idev->dev;

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	err = 0;
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	read_lock_bh(&ipv6_sk_mc_lock);

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	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
		leavegroup = 1;
		goto done;
	}

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	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
		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;
		}
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	} else {
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		newpsl = NULL;
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		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
	}
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	write_lock_bh(&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;
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	write_unlock_bh(&pmc->sflock);
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	err = 0;
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done:
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	read_unlock_bh(&ipv6_sk_mc_lock);
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	read_unlock_bh(&idev->lock);
	in6_dev_put(idev);
	dev_put(dev);
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	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;
	struct in6_addr *group;
	struct ipv6_mc_socklist *pmc;
	struct inet6_dev *idev;
	struct net_device *dev;
	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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	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;

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

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	idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
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	if (!idev)
		return -ENODEV;

	dev = idev->dev;

	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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	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
		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);
	in6_dev_put(idev);
	dev_put(dev);

	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;
	}
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	/* 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];
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		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);
	in6_dev_put(idev);
	dev_put(dev);
	return err;
}

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int 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;
	int rv = 1;

	read_lock(&ipv6_sk_mc_lock);
	for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
		if (ipv6_addr_equal(&mc->addr, mc_addr))
			break;
	}
	if (!mc) {
		read_unlock(&ipv6_sk_mc_lock);
		return 1;
	}
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	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)
			rv = 0;
		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
			rv = 0;
	}
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	read_unlock(&mc->sflock);
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	read_unlock(&ipv6_sk_mc_lock);

	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];

	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)
			dev_mc_add(dev, buf, dev->addr_len, 0);
	}
	spin_unlock_bh(&mc->mca_lock);

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

	if (MLD_V1_SEEN(mc->idev)) {
		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];

	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)
			dev_mc_delete(dev, buf, dev->addr_len, 0);
	}

	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);

	write_lock_bh(&idev->mc_lock);
	pmc->next = idev->mc_tomb;
	idev->mc_tomb = pmc;
	write_unlock_bh(&idev->mc_lock);
}

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

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

	write_lock_bh(&idev->mc_lock);
	pmc = idev->mc_tomb;
	idev->mc_tomb = NULL;
	write_unlock_bh(&idev->mc_lock);

	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)
 */
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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;

	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.
	 */

900
	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;
	}

908
	setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
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	ipv6_addr_copy(&mc->mca_addr, addr);
	mc->idev = idev;
	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
 */
939
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;
}

964
int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
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{
	struct inet6_dev *idev = in6_dev_get(dev);
	int err;

	if (!idev)
		return -ENODEV;

	err = __ipv6_dev_mc_dec(idev, addr);

	in6_dev_put(idev);

	return err;
}

/*
 * identify MLD packets for MLD filter exceptions
 */
int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
{
	struct icmp6hdr *pic;

	if (nexthdr != IPPROTO_ICMPV6)
		return 0;

	if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
		return 0;

992
	pic = icmp6_hdr(skb);
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	switch (pic->icmp6_type) {
	case ICMPV6_MGM_QUERY:
	case ICMPV6_MGM_REPORT:
	case ICMPV6_MGM_REDUCTION:
	case ICMPV6_MLD2_REPORT:
		return 1;
	default:
		break;
	}
	return 0;
}

/*
 *	check if the interface/address pair is valid
 */
1009 1010
int 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;
	int rv = 0;

	idev = in6_dev_get(dev);
	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
				rv = 1; /* don't filter unspecified source */
		}
		read_unlock_bh(&idev->lock);
		in6_dev_put(idev);
	}
	return rv;
}

static void mld_gq_start_timer(struct inet6_dev *idev)
{
	int tv = net_random() % idev->mc_maxdelay;

	idev->mc_gq_running = 1;
	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
		in6_dev_hold(idev);
}

static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
{
	int tv = net_random() % delay;

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

/*
 *	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;
	}

	if (delay >= resptime) {
		if (resptime)
			delay = net_random() % resptime;
		else
			delay = 1;
	}
	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;
}

1095 1096
/* mark EXCLUDE-mode sources */
static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
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	struct in6_addr *srcs)
{
	struct ip6_sf_list *psf;
	int i, scount;

	scount = 0;
	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
		if (scount == nsrcs)
			break;
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		for (i=0; i<nsrcs; i++) {
			/* skip inactive filters */
			if (pmc->mca_sfcount[MCAST_INCLUDE] ||
			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
			    psf->sf_count[MCAST_EXCLUDE])
				continue;
			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
				scount++;
				break;
			}
		}
	}
	pmc->mca_flags &= ~MAF_GSQUERY;
	if (scount == nsrcs)	/* all sources excluded */
		return 0;
	return 1;
}

static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
	struct in6_addr *srcs)
{
	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++) {
L
Linus Torvalds 已提交
1140 1141 1142 1143 1144
			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
				psf->sf_gsresp = 1;
				scount++;
				break;
			}
1145 1146 1147 1148 1149
		}
	}
	if (!scount) {
		pmc->mca_flags &= ~MAF_GSQUERY;
		return 0;
L
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1150
	}
1151 1152
	pmc->mca_flags |= MAF_GSQUERY;
	return 1;
L
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1153 1154 1155 1156
}

int igmp6_event_query(struct sk_buff *skb)
{
1157
	struct mld2_query *mlh2 = NULL;
L
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1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
	struct ifmcaddr6 *ma;
	struct in6_addr *group;
	unsigned long max_delay;
	struct inet6_dev *idev;
	struct icmp6hdr *hdr;
	int group_type;
	int mark = 0;
	int len;

	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
		return -EINVAL;

	/* compute payload length excluding extension headers */
1171
	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1172
	len -= skb_network_header_len(skb);
L
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1173 1174

	/* Drop queries with not link local source */
1175
	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
L
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1176 1177 1178 1179 1180 1181 1182
		return -EINVAL;

	idev = in6_dev_get(skb->dev);

	if (idev == NULL)
		return 0;

1183
	hdr = icmp6_hdr(skb);
L
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	group = (struct in6_addr *) (hdr + 1);
	group_type = ipv6_addr_type(group);

	if (group_type != IPV6_ADDR_ANY &&
	    !(group_type&IPV6_ADDR_MULTICAST)) {
		in6_dev_put(idev);
		return -EINVAL;
	}

	if (len == 24) {
		int switchback;
		/* MLDv1 router present */

		/* Translate milliseconds to jiffies */
		max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;

		switchback = (idev->mc_qrv + 1) * max_delay;
		idev->mc_v1_seen = jiffies + switchback;

		/* cancel the interface change timer */
		idev->mc_ifc_count = 0;
		if (del_timer(&idev->mc_ifc_timer))
			__in6_dev_put(idev);
		/* clear deleted report items */
		mld_clear_delrec(idev);
	} else if (len >= 28) {
1210
		int srcs_offset = sizeof(struct mld2_query) -
1211 1212 1213 1214 1215
				  sizeof(struct icmp6hdr);
		if (!pskb_may_pull(skb, srcs_offset)) {
			in6_dev_put(idev);
			return -EINVAL;
		}
1216
		mlh2 = (struct mld2_query *)skb_transport_header(skb);
L
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		max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
		if (!max_delay)
			max_delay = 1;
		idev->mc_maxdelay = max_delay;
		if (mlh2->qrv)
			idev->mc_qrv = mlh2->qrv;
		if (group_type == IPV6_ADDR_ANY) { /* general query */
			if (mlh2->nsrcs) {
				in6_dev_put(idev);
				return -EINVAL; /* no sources allowed */
			}
			mld_gq_start_timer(idev);
			in6_dev_put(idev);
			return 0;
		}
		/* mark sources to include, if group & source-specific */
1233
		if (mlh2->nsrcs != 0) {
1234
			if (!pskb_may_pull(skb, srcs_offset +
1235
			    ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1236 1237 1238
				in6_dev_put(idev);
				return -EINVAL;
			}
1239
			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1240 1241
			mark = 1;
		}
L
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	} else {
		in6_dev_put(idev);
		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) {
1256
			if (!ipv6_addr_equal(group, &ma->mca_addr))
L
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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;
			}
1270
			if (!(ma->mca_flags & MAF_GSQUERY) ||
1271
			    mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1272
				igmp6_group_queried(ma, max_delay);
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1273
			spin_unlock_bh(&ma->mca_lock);
1274
			break;
L
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		}
	}
	read_unlock_bh(&idev->lock);
	in6_dev_put(idev);

	return 0;
}


int igmp6_event_report(struct sk_buff *skb)
{
	struct ifmcaddr6 *ma;
	struct in6_addr *addrp;
	struct inet6_dev *idev;
	struct icmp6hdr *hdr;
	int addr_type;

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

1296 1297 1298 1299 1300
	/* 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;

L
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	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
		return -EINVAL;

1304
	hdr = icmp6_hdr(skb);
L
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1305 1306

	/* Drop reports with not link local source */
1307
	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1308
	if (addr_type != IPV6_ADDR_ANY &&
L
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1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
	    !(addr_type&IPV6_ADDR_LINKLOCAL))
		return -EINVAL;

	addrp = (struct in6_addr *) (hdr + 1);

	idev = in6_dev_get(skb->dev);
	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) {
		if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
			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);
	in6_dev_put(idev);
	return 0;
}

static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
	int gdeleted, int sdeleted)
{
	switch (type) {
	case MLD2_MODE_IS_INCLUDE:
	case MLD2_MODE_IS_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
1346 1347 1348 1349 1350 1351 1352
		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
			if (pmc->mca_sfmode == MCAST_INCLUDE)
				return 1;
			/* don't include if this source is excluded
			 * in all filters
			 */
			if (psf->sf_count[MCAST_INCLUDE])
1353
				return type == MLD2_MODE_IS_INCLUDE;
1354 1355 1356 1357
			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
				psf->sf_count[MCAST_EXCLUDE];
		}
		return 0;
L
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1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
	case MLD2_CHANGE_TO_INCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		return psf->sf_count[MCAST_INCLUDE] != 0;
	case MLD2_CHANGE_TO_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
		    psf->sf_count[MCAST_INCLUDE])
			return 0;
		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
			psf->sf_count[MCAST_EXCLUDE];
	case MLD2_ALLOW_NEW_SOURCES:
		if (gdeleted || !psf->sf_crcount)
			return 0;
		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;
	}
	return 0;
}

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;
}

static struct sk_buff *mld_newpack(struct net_device *dev, int size)
{
1398
	struct net *net = dev_net(dev);
1399
	struct sock *sk = net->ipv6.igmp_sk;
L
Linus Torvalds 已提交
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	struct sk_buff *skb;
	struct mld2_report *pmr;
	struct in6_addr addr_buf;
1403
	const struct in6_addr *saddr;
L
Linus Torvalds 已提交
1404 1405 1406 1407 1408 1409
	int err;
	u8 ra[8] = { IPPROTO_ICMPV6, 0,
		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
		     IPV6_TLV_PADN, 0 };

	/* we assume size > sizeof(ra) here */
1410
	skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
L
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1411

S
Stephen Hemminger 已提交
1412
	if (!skb)
L
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1413 1414 1415 1416
		return NULL;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));

1417
	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
L
Linus Torvalds 已提交
1418
		/* <draft-ietf-magma-mld-source-05.txt>:
1419
		 * use unspecified address as the source address
L
Linus Torvalds 已提交
1420 1421
		 * when a valid link-local address is not available.
		 */
1422 1423 1424
		saddr = &in6addr_any;
	} else
		saddr = &addr_buf;
L
Linus Torvalds 已提交
1425

1426
	ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
L
Linus Torvalds 已提交
1427 1428 1429

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

1430
	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1431 1432
	skb_put(skb, sizeof(*pmr));
	pmr = (struct mld2_report *)skb_transport_header(skb);
L
Linus Torvalds 已提交
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	pmr->type = ICMPV6_MLD2_REPORT;
	pmr->resv1 = 0;
	pmr->csum = 0;
	pmr->resv2 = 0;
	pmr->ngrec = 0;
	return skb;
}

static void mld_sendpack(struct sk_buff *skb)
{
1443
	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1444 1445
	struct mld2_report *pmr =
			      (struct mld2_report *)skb_transport_header(skb);
L
Linus Torvalds 已提交
1446 1447
	int payload_len, mldlen;
	struct inet6_dev *idev = in6_dev_get(skb->dev);
1448
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1449
	int err;
1450
	struct flowi fl;
E
Eric Dumazet 已提交
1451
	struct dst_entry *dst;
L
Linus Torvalds 已提交
1452

1453 1454
	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);

1455 1456
	payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
	mldlen = skb->tail - skb->transport_header;
L
Linus Torvalds 已提交
1457 1458 1459
	pip6->payload_len = htons(payload_len);

	pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1460 1461
		IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
					     mldlen, 0));
1462

E
Eric Dumazet 已提交
1463
	dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1464

E
Eric Dumazet 已提交
1465
	if (!dst) {
1466 1467 1468 1469
		err = -ENOMEM;
		goto err_out;
	}

1470
	icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1471 1472 1473
			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
			 skb->dev->ifindex);

E
Eric Dumazet 已提交
1474 1475
	err = xfrm_lookup(net, &dst, &fl, NULL, 0);
	skb_dst_set(skb, dst);
1476 1477 1478
	if (err)
		goto err_out;

1479 1480
	payload_len = skb->len;

1481
	err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1482 1483
		      dst_output);
out:
L
Linus Torvalds 已提交
1484
	if (!err) {
1485
		ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1486
		ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1487
		IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
L
Linus Torvalds 已提交
1488
	} else
1489
		IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
L
Linus Torvalds 已提交
1490 1491 1492

	if (likely(idev != NULL))
		in6_dev_put(idev);
1493 1494 1495 1496 1497
	return;

err_out:
	kfree_skb(skb);
	goto out;
L
Linus Torvalds 已提交
1498 1499 1500 1501
}

static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
{
1502
	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
L
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1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520
}

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)
		skb = mld_newpack(dev, dev->mtu);
	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 */
1521
	pmr = (struct mld2_report *)skb_transport_header(skb);
L
Linus Torvalds 已提交
1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
	pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
	*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,
	int type, int gdeleted, int sdeleted)
{
	struct net_device *dev = pmc->idev->dev;
	struct mld2_report *pmr;
	struct mld2_grec *pgr = NULL;
	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1537
	int scount, stotal, first, isquery, truncate;
L
Linus Torvalds 已提交
1538 1539 1540 1541 1542 1543 1544 1545 1546

	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;

1547 1548
	stotal = scount = 0;

L
Linus Torvalds 已提交
1549 1550
	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;

1551 1552 1553
	if (!*psf_list)
		goto empty_source;

1554
	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
L
Linus Torvalds 已提交
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596

	/* EX and TO_EX get a fresh packet, if needed */
	if (truncate) {
		if (pmr && pmr->ngrec &&
		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
			if (skb)
				mld_sendpack(skb);
			skb = mld_newpack(dev, dev->mtu);
		}
	}
	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);
			skb = mld_newpack(dev, dev->mtu);
			first = 1;
			scount = 0;
		}
		if (first) {
			skb = add_grhead(skb, pmc, type, &pgr);
			first = 0;
		}
1597 1598
		if (!skb)
			return NULL;
L
Linus Torvalds 已提交
1599 1600
		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
		*psrc = psf->sf_addr;
1601
		scount++; stotal++;
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
		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;
	}
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630

empty_source:
	if (!stotal) {
		if (type == MLD2_ALLOW_NEW_SOURCES ||
		    type == MLD2_BLOCK_OLD_SOURCES)
			return skb;
		if (pmc->mca_crcount || isquery) {
			/* 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
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	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;

	if (!pmc) {
		read_lock_bh(&idev->lock);
		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;
			skb = add_grec(skb, pmc, type, 0, 0);
			spin_unlock_bh(&pmc->mca_lock);
		}
		read_unlock_bh(&idev->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;
		skb = add_grec(skb, pmc, type, 0, 0);
		spin_unlock_bh(&pmc->mca_lock);
	}
	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);
	write_lock_bh(&idev->mc_lock);

	/* 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;
			skb = add_grec(skb, pmc, type, 1, 0);
			skb = add_grec(skb, pmc, dtype, 1, 1);
		}
		if (pmc->mca_crcount) {
			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
				type = MLD2_CHANGE_TO_INCLUDE;
				skb = add_grec(skb, pmc, type, 1, 0);
			}
1716
			pmc->mca_crcount--;
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Linus Torvalds 已提交
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
			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;
	}
	write_unlock_bh(&idev->mc_lock);

	/* 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;
		}
		skb = add_grec(skb, pmc, type, 0, 0);
		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */

		/* filter mode changes */
		if (pmc->mca_crcount) {
			if (pmc->mca_sfmode == MCAST_EXCLUDE)
				type = MLD2_CHANGE_TO_EXCLUDE;
			else
				type = MLD2_CHANGE_TO_INCLUDE;
			skb = add_grec(skb, pmc, type, 0, 0);
1755
			pmc->mca_crcount--;
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		}
		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)
{
1767
	struct net *net = dev_net(dev);
1768
	struct sock *sk = net->ipv6.igmp_sk;
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	struct inet6_dev *idev;
1770 1771
	struct sk_buff *skb;
	struct icmp6hdr *hdr;
1772
	const struct in6_addr *snd_addr, *saddr;
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	struct in6_addr *addrp;
	struct in6_addr addr_buf;
	int err, len, payload_len, full_len;
	u8 ra[8] = { IPPROTO_ICMPV6, 0,
		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
		     IPV6_TLV_PADN, 0 };
1779
	struct flowi fl;
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Eric Dumazet 已提交
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	struct dst_entry *dst;
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1782 1783 1784 1785
	if (type == ICMPV6_MGM_REDUCTION)
		snd_addr = &in6addr_linklocal_allrouters;
	else
		snd_addr = addr;
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	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
	payload_len = len + sizeof(ra);
	full_len = sizeof(struct ipv6hdr) + payload_len;

1791 1792 1793 1794 1795
	rcu_read_lock();
	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
		      IPSTATS_MIB_OUT, full_len);
	rcu_read_unlock();

1796
	skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
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	if (skb == NULL) {
1799
		rcu_read_lock();
1800
		IP6_INC_STATS(net, __in6_dev_get(dev),
1801 1802
			      IPSTATS_MIB_OUTDISCARDS);
		rcu_read_unlock();
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		return;
	}

	skb_reserve(skb, LL_RESERVED_SPACE(dev));

1808
	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
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		/* <draft-ietf-magma-mld-source-05.txt>:
1810
		 * use unspecified address as the source address
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		 * when a valid link-local address is not available.
		 */
1813 1814 1815
		saddr = &in6addr_any;
	} else
		saddr = &addr_buf;
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1817
	ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
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	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));

	hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
	memset(hdr, 0, sizeof(struct icmp6hdr));
	hdr->icmp6_type = type;

	addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
	ipv6_addr_copy(addrp, addr);

1828
	hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
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					   IPPROTO_ICMPV6,
1830
					   csum_partial(hdr, len, 0));
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	idev = in6_dev_get(skb->dev);

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	dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
	if (!dst) {
1836 1837 1838 1839
		err = -ENOMEM;
		goto err_out;
	}

1840
	icmpv6_flow_init(sk, &fl, type,
1841 1842 1843
			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
			 skb->dev->ifindex);

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	err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1845 1846 1847
	if (err)
		goto err_out;

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	skb_dst_set(skb, dst);
1849
	err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1850 1851
		      dst_output);
out:
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	if (!err) {
1853
		ICMP6MSGOUT_INC_STATS(net, idev, type);
1854
		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1855
		IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
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	} else
1857
		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
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	if (likely(idev != NULL))
		in6_dev_put(idev);
	return;
1862 1863 1864 1865

err_out:
	kfree_skb(skb);
	goto out;
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}

static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
	struct in6_addr *psfsrc)
{
	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) &&
		    !MLD_V1_SEEN(idev)) {
			psf->sf_crcount = idev->mc_qrv;
			psf->sf_next = pmc->mca_tomb;
			pmc->mca_tomb = psf;
			rv = 1;
		} else
			kfree(psf);
	}
	return rv;
}

static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
			  int sfmode, int sfcount, struct in6_addr *psfsrc,
			  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,
	struct in6_addr *psfsrc, int delta)
{
	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) {
1977
		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
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		if (!psf)
			return -ENOBUFS;
1980

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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)
{
2007
	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;
2019 2020
		if (new_in) {
			if (!psf->sf_oldin) {
2021
				struct ip6_sf_list *prev = NULL;
2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060

				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) {
				dpsf = (struct ip6_sf_list *)
					kmalloc(sizeof(*dpsf), GFP_ATOMIC);
				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
 */
static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
			  int sfmode, int sfcount, struct in6_addr *psfsrc,
			  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++) {
		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
		if (err)
			break;
	}
	if (err) {
		int j;

		if (!delta)
			pmc->mca_sfcount[sfmode]--;
		for (j=0; j<i; j++)
			(void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
	} 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;
2146
	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);

	delay = net_random() % IGMP6_UNSOLICITED_IVAL;

	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;

2179 2180 2181
	/* 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
	 */
S
Stephen Hemminger 已提交
2182
	if (!iml->sflist) {
L
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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)
{
	if (MLD_V1_SEEN(ma->idev)) {
		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);
	__in6_dev_put(idev);
}

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);
	}
	__in6_dev_put(idev);
}

static void mld_ifc_event(struct inet6_dev *idev)
{
	if (MLD_V1_SEEN(idev))
		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;

	if (MLD_V1_SEEN(ma->idev))
		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);
}

2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270
/* 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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2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315
/* Device going down */

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

	/* Withdraw multicast list */

	read_lock_bh(&idev->lock);
	idev->mc_ifc_count = 0;
	if (del_timer(&idev->mc_ifc_timer))
		__in6_dev_put(idev);
	idev->mc_gq_running = 0;
	if (del_timer(&idev->mc_gq_timer))
		__in6_dev_put(idev);

	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);
	rwlock_init(&idev->mc_lock);
	idev->mc_gq_running = 0;
2316 2317
	setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
			(unsigned long)idev);
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2318 2319
	idev->mc_tomb = NULL;
	idev->mc_ifc_count = 0;
2320 2321
	setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
			(unsigned long)idev);
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	idev->mc_qrv = MLD_QRV_DEFAULT;
	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
	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.
	 */
2344
	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
L
Linus Torvalds 已提交
2345

2346 2347
	if (idev->cnf.forwarding)
		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
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2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363

	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 {
2364
	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);
2375
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
2376

2377
	state->idev = NULL;
2378
	for_each_netdev_rcu(net, state->dev) {
L
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2379
		struct inet6_dev *idev;
2380
		idev = __in6_dev_get(state->dev);
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2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399
		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) {
2400
		if (likely(state->idev != NULL))
L
Linus Torvalds 已提交
2401
			read_unlock_bh(&state->idev->lock);
2402 2403

		state->dev = next_net_device_rcu(state->dev);
L
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2404 2405 2406 2407
		if (!state->dev) {
			state->idev = NULL;
			break;
		}
2408
		state->idev = __in6_dev_get(state->dev);
L
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2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
		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)
2427
	__acquires(RCU)
L
Linus Torvalds 已提交
2428
{
2429
	rcu_read_lock();
L
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2430 2431 2432 2433 2434
	return igmp6_mc_get_idx(seq, *pos);
}

static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2435 2436
	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);

L
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2437 2438 2439 2440 2441
	++*pos;
	return im;
}

static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2442
	__releases(RCU)
L
Linus Torvalds 已提交
2443 2444
{
	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2445

L
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2446 2447 2448 2449 2450
	if (likely(state->idev != NULL)) {
		read_unlock_bh(&state->idev->lock);
		state->idev = NULL;
	}
	state->dev = NULL;
2451
	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,
2460
		   "%-4d %-15s %pi6 %5d %08X %ld\n",
L
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2461
		   state->dev->ifindex, state->dev->name,
2462
		   &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;
}

2469
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)
{
2478 2479
	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
			    sizeof(struct igmp6_mc_iter_state));
L
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2480 2481
}

2482
static const struct file_operations igmp6_mc_seq_fops = {
L
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2483 2484 2485 2486
	.owner		=	THIS_MODULE,
	.open		=	igmp6_mc_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2487
	.release	=	seq_release_net,
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2488 2489 2490
};

struct igmp6_mcf_iter_state {
2491
	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);
2504
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
2505

2506 2507
	state->idev = NULL;
	state->im = NULL;
2508
	for_each_netdev_rcu(net, state->dev) {
L
Linus Torvalds 已提交
2509
		struct inet6_dev *idev;
2510
		idev = __in6_dev_get(state->dev);
L
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2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
		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) {
2539
			if (likely(state->idev != NULL))
L
Linus Torvalds 已提交
2540
				read_unlock_bh(&state->idev->lock);
2541 2542

			state->dev = next_net_device_rcu(state->dev);
L
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2543 2544 2545 2546
			if (!state->dev) {
				state->idev = NULL;
				goto out;
			}
2547
			state->idev = __in6_dev_get(state->dev);
L
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2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571
			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)
2572
	__acquires(RCU)
L
Linus Torvalds 已提交
2573
{
2574
	rcu_read_lock();
L
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2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589
	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)
2590
	__releases(RCU)
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2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
{
	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;
2602
	rcu_read_unlock();
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2603 2604 2605 2606 2607 2608 2609 2610
}

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) {
2611
		seq_printf(seq,
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2612
			   "%3s %6s "
2613
			   "%32s %32s %6s %6s\n", "Idx",
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2614 2615 2616 2617
			   "Device", "Multicast Address",
			   "Source Address", "INC", "EXC");
	} else {
		seq_printf(seq,
2618
			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
L
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2619
			   state->dev->ifindex, state->dev->name,
2620 2621
			   &state->im->mca_addr,
			   &psf->sf_addr,
L
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2622 2623 2624 2625 2626 2627
			   psf->sf_count[MCAST_INCLUDE],
			   psf->sf_count[MCAST_EXCLUDE]);
	}
	return 0;
}

2628
static const struct seq_operations igmp6_mcf_seq_ops = {
L
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2629 2630 2631 2632 2633 2634 2635 2636
	.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)
{
2637 2638
	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
			    sizeof(struct igmp6_mcf_iter_state));
L
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2639 2640
}

2641
static const struct file_operations igmp6_mcf_seq_fops = {
L
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2642 2643 2644 2645
	.owner		=	THIS_MODULE,
	.open		=	igmp6_mcf_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2646
	.release	=	seq_release_net,
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2647
};
2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682

static int igmp6_proc_init(struct net *net)
{
	int err;

	err = -ENOMEM;
	if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
		goto out;
	if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
				  &igmp6_mcf_seq_fops))
		goto out_proc_net_igmp6;

	err = 0;
out:
	return err;

out_proc_net_igmp6:
	proc_net_remove(net, "igmp6");
	goto out;
}

static void igmp6_proc_exit(struct net *net)
{
	proc_net_remove(net, "mcfilter6");
	proc_net_remove(net, "igmp6");
}
#else
static int igmp6_proc_init(struct net *net)
{
	return 0;
}
static void igmp6_proc_exit(struct net *net)
{
	;
}
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2683 2684
#endif

2685
static int igmp6_net_init(struct net *net)
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{
	int err;

2689 2690
	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
				   SOCK_RAW, IPPROTO_ICMPV6, net);
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2691 2692 2693 2694
	if (err < 0) {
		printk(KERN_ERR
		       "Failed to initialize the IGMP6 control socket (err %d).\n",
		       err);
2695
		goto out;
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2696 2697
	}

2698
	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
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2699

2700 2701
	err = igmp6_proc_init(net);
	if (err)
2702 2703 2704 2705 2706
		goto out_sock_create;
out:
	return err;

out_sock_create:
2707
	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2708
	goto out;
L
Linus Torvalds 已提交
2709 2710
}

2711
static void igmp6_net_exit(struct net *net)
L
Linus Torvalds 已提交
2712
{
2713
	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2714
	igmp6_proc_exit(net);
L
Linus Torvalds 已提交
2715
}
2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730

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);
}