igmp.c 61.9 KB
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/*
 *	Linux NET3:	Internet Group Management Protocol  [IGMP]
 *
 *	This code implements the IGMP protocol as defined in RFC1112. There has
 *	been a further revision of this protocol since which is now supported.
 *
 *	If you have trouble with this module be careful what gcc you have used,
 *	the older version didn't come out right using gcc 2.5.8, the newer one
 *	seems to fall out with gcc 2.6.2.
 *
 *	Authors:
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 *		Alan Cox <alan@lxorguk.ukuu.org.uk>
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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.
 *
 *	Fixes:
 *
 *		Alan Cox	:	Added lots of __inline__ to optimise
 *					the memory usage of all the tiny little
 *					functions.
 *		Alan Cox	:	Dumped the header building experiment.
 *		Alan Cox	:	Minor tweaks ready for multicast routing
 *					and extended IGMP protocol.
 *		Alan Cox	:	Removed a load of inline directives. Gcc 2.5.8
 *					writes utterly bogus code otherwise (sigh)
 *					fixed IGMP loopback to behave in the manner
 *					desired by mrouted, fixed the fact it has been
 *					broken since 1.3.6 and cleaned up a few minor
 *					points.
 *
 *		Chih-Jen Chang	:	Tried to revise IGMP to Version 2
 *		Tsu-Sheng Tsao		E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
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 *					The enhancements are mainly based on Steve Deering's
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 * 					ipmulti-3.5 source code.
 *		Chih-Jen Chang	:	Added the igmp_get_mrouter_info and
 *		Tsu-Sheng Tsao		igmp_set_mrouter_info to keep track of
 *					the mrouted version on that device.
 *		Chih-Jen Chang	:	Added the max_resp_time parameter to
 *		Tsu-Sheng Tsao		igmp_heard_query(). Using this parameter
 *					to identify the multicast router version
 *					and do what the IGMP version 2 specified.
 *		Chih-Jen Chang	:	Added a timer to revert to IGMP V2 router
 *		Tsu-Sheng Tsao		if the specified time expired.
 *		Alan Cox	:	Stop IGMP from 0.0.0.0 being accepted.
 *		Alan Cox	:	Use GFP_ATOMIC in the right places.
 *		Christian Daudt :	igmp timer wasn't set for local group
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 *					memberships but was being deleted,
 *					which caused a "del_timer() called
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 *					from %p with timer not initialized\n"
 *					message (960131).
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 *		Christian Daudt :	removed del_timer from
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 *					igmp_timer_expire function (960205).
 *             Christian Daudt :       igmp_heard_report now only calls
 *                                     igmp_timer_expire if tm->running is
 *                                     true (960216).
 *		Malcolm Beattie :	ttl comparison wrong in igmp_rcv made
 *					igmp_heard_query never trigger. Expiry
 *					miscalculation fixed in igmp_heard_query
 *					and random() made to return unsigned to
 *					prevent negative expiry times.
 *		Alexey Kuznetsov:	Wrong group leaving behaviour, backport
 *					fix from pending 2.1.x patches.
 *		Alan Cox:		Forget to enable FDDI support earlier.
 *		Alexey Kuznetsov:	Fixed leaving groups on device down.
 *		Alexey Kuznetsov:	Accordance to igmp-v2-06 draft.
 *		David L Stevens:	IGMPv3 support, with help from
 *					Vinay Kulkarni
 */

#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/if_arp.h>
#include <linux/rtnetlink.h>
#include <linux/times.h>
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#include <net/net_namespace.h>
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#include <net/arp.h>
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#include <net/ip.h>
#include <net/protocol.h>
#include <net/route.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <linux/netfilter_ipv4.h>
#ifdef CONFIG_IP_MROUTE
#include <linux/mroute.h>
#endif
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif

#define IP_MAX_MEMBERSHIPS	20
#define IP_MAX_MSF		10

#ifdef CONFIG_IP_MULTICAST
/* Parameter names and values are taken from igmp-v2-06 draft */

#define IGMP_V1_Router_Present_Timeout		(400*HZ)
#define IGMP_V2_Router_Present_Timeout		(400*HZ)
#define IGMP_Unsolicited_Report_Interval	(10*HZ)
#define IGMP_Query_Response_Interval		(10*HZ)
#define IGMP_Unsolicited_Report_Count		2


#define IGMP_Initial_Report_Delay		(1)

/* IGMP_Initial_Report_Delay is not from IGMP specs!
 * IGMP specs require to report membership immediately after
 * joining a group, but we delay the first report by a
 * small interval. It seems more natural and still does not
 * contradict to specs provided this delay is small enough.
 */

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#define IGMP_V1_SEEN(in_dev) \
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	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
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	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
	 ((in_dev)->mr_v1_seen && \
	  time_before(jiffies, (in_dev)->mr_v1_seen)))
#define IGMP_V2_SEEN(in_dev) \
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	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
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	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
	 ((in_dev)->mr_v2_seen && \
	  time_before(jiffies, (in_dev)->mr_v2_seen)))
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static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
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static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
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static void igmpv3_clear_delrec(struct in_device *in_dev);
static int sf_setstate(struct ip_mc_list *pmc);
static void sf_markstate(struct ip_mc_list *pmc);
#endif
static void ip_mc_clear_src(struct ip_mc_list *pmc);
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static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta);
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static void ip_ma_put(struct ip_mc_list *im)
{
	if (atomic_dec_and_test(&im->refcnt)) {
		in_dev_put(im->interface);
		kfree(im);
	}
}

#ifdef CONFIG_IP_MULTICAST

/*
 *	Timer management
 */

static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
{
	spin_lock_bh(&im->lock);
	if (del_timer(&im->timer))
		atomic_dec(&im->refcnt);
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	im->tm_running = 0;
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	im->reporter = 0;
	im->unsolicit_count = 0;
	spin_unlock_bh(&im->lock);
}

/* It must be called with locked im->lock */
static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
{
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	int tv = net_random() % max_delay;
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	im->tm_running = 1;
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	if (!mod_timer(&im->timer, jiffies+tv+2))
		atomic_inc(&im->refcnt);
}

static void igmp_gq_start_timer(struct in_device *in_dev)
{
	int tv = net_random() % in_dev->mr_maxdelay;

	in_dev->mr_gq_running = 1;
	if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
		in_dev_hold(in_dev);
}

static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
{
	int tv = net_random() % delay;

	if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
		in_dev_hold(in_dev);
}

static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
{
	spin_lock_bh(&im->lock);
	im->unsolicit_count = 0;
	if (del_timer(&im->timer)) {
		if ((long)(im->timer.expires-jiffies) < max_delay) {
			add_timer(&im->timer);
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			im->tm_running = 1;
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			spin_unlock_bh(&im->lock);
			return;
		}
		atomic_dec(&im->refcnt);
	}
	igmp_start_timer(im, max_delay);
	spin_unlock_bh(&im->lock);
}


/*
 *	Send an IGMP report.
 */

#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)


static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
	int gdeleted, int sdeleted)
{
	switch (type) {
	case IGMPV3_MODE_IS_INCLUDE:
	case IGMPV3_MODE_IS_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
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		if (!(pmc->gsquery && !psf->sf_gsresp)) {
			if (pmc->sfmode == MCAST_INCLUDE)
				return 1;
			/* don't include if this source is excluded
			 * in all filters
			 */
			if (psf->sf_count[MCAST_INCLUDE])
				return type == IGMPV3_MODE_IS_INCLUDE;
			return pmc->sfcount[MCAST_EXCLUDE] ==
				psf->sf_count[MCAST_EXCLUDE];
		}
		return 0;
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	case IGMPV3_CHANGE_TO_INCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		return psf->sf_count[MCAST_INCLUDE] != 0;
	case IGMPV3_CHANGE_TO_EXCLUDE:
		if (gdeleted || sdeleted)
			return 0;
		if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
		    psf->sf_count[MCAST_INCLUDE])
			return 0;
		return pmc->sfcount[MCAST_EXCLUDE] ==
			psf->sf_count[MCAST_EXCLUDE];
	case IGMPV3_ALLOW_NEW_SOURCES:
		if (gdeleted || !psf->sf_crcount)
			return 0;
		return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
	case IGMPV3_BLOCK_OLD_SOURCES:
		if (pmc->sfmode == MCAST_INCLUDE)
			return gdeleted || (psf->sf_crcount && sdeleted);
		return psf->sf_crcount && !gdeleted && !sdeleted;
	}
	return 0;
}

static int
igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
{
	struct ip_sf_list *psf;
	int scount = 0;

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

static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
{
	struct sk_buff *skb;
	struct rtable *rt;
	struct iphdr *pip;
	struct igmpv3_report *pig;
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	struct net *net = dev_net(dev);
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	skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
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	if (skb == NULL)
		return NULL;

	{
		struct flowi fl = { .oif = dev->ifindex,
				    .nl_u = { .ip4_u = {
				    .daddr = IGMPV3_ALL_MCR } },
				    .proto = IPPROTO_IGMP };
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		if (ip_route_output_key(net, &rt, &fl)) {
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			kfree_skb(skb);
			return NULL;
		}
	}
	if (rt->rt_src == 0) {
		kfree_skb(skb);
		ip_rt_put(rt);
		return NULL;
	}

	skb->dst = &rt->u.dst;
	skb->dev = dev;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));

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	skb_reset_network_header(skb);
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	pip = ip_hdr(skb);
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	skb_put(skb, sizeof(struct iphdr) + 4);
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	pip->version  = 4;
	pip->ihl      = (sizeof(struct iphdr)+4)>>2;
	pip->tos      = 0xc0;
	pip->frag_off = htons(IP_DF);
	pip->ttl      = 1;
	pip->daddr    = rt->rt_dst;
	pip->saddr    = rt->rt_src;
	pip->protocol = IPPROTO_IGMP;
	pip->tot_len  = 0;	/* filled in later */
	ip_select_ident(pip, &rt->u.dst, NULL);
	((u8*)&pip[1])[0] = IPOPT_RA;
	((u8*)&pip[1])[1] = 4;
	((u8*)&pip[1])[2] = 0;
	((u8*)&pip[1])[3] = 0;

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	skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
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	skb_put(skb, sizeof(*pig));
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	pig = igmpv3_report_hdr(skb);
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	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
	pig->resv1 = 0;
	pig->csum = 0;
	pig->resv2 = 0;
	pig->ngrec = 0;
	return skb;
}

static int igmpv3_sendpack(struct sk_buff *skb)
{
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	struct igmphdr *pig = igmp_hdr(skb);
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	const int igmplen = skb->tail - skb->transport_header;
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	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
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	return ip_local_out(skb);
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}

static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
{
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	return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
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}

static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
	int type, struct igmpv3_grec **ppgr)
{
	struct net_device *dev = pmc->interface->dev;
	struct igmpv3_report *pih;
	struct igmpv3_grec *pgr;

	if (!skb)
		skb = igmpv3_newpack(dev, dev->mtu);
	if (!skb)
		return NULL;
	pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
	pgr->grec_type = type;
	pgr->grec_auxwords = 0;
	pgr->grec_nsrcs = 0;
	pgr->grec_mca = pmc->multiaddr;
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	pih = igmpv3_report_hdr(skb);
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	pih->ngrec = htons(ntohs(pih->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 ip_mc_list *pmc,
	int type, int gdeleted, int sdeleted)
{
	struct net_device *dev = pmc->interface->dev;
	struct igmpv3_report *pih;
	struct igmpv3_grec *pgr = NULL;
	struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
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	int scount, stotal, first, isquery, truncate;
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	if (pmc->multiaddr == IGMP_ALL_HOSTS)
		return skb;

	isquery = type == IGMPV3_MODE_IS_INCLUDE ||
		  type == IGMPV3_MODE_IS_EXCLUDE;
	truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
		    type == IGMPV3_CHANGE_TO_EXCLUDE;

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	stotal = scount = 0;

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	psf_list = sdeleted ? &pmc->tomb : &pmc->sources;

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	if (!*psf_list)
		goto empty_source;

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	pih = skb ? igmpv3_report_hdr(skb) : NULL;
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	/* EX and TO_EX get a fresh packet, if needed */
	if (truncate) {
		if (pih && pih->ngrec &&
		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
			if (skb)
				igmpv3_sendpack(skb);
			skb = igmpv3_newpack(dev, dev->mtu);
		}
	}
	first = 1;
	psf_prev = NULL;
	for (psf=*psf_list; psf; psf=psf_next) {
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		__be32 *psrc;
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		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;

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		if (AVAILABLE(skb) < sizeof(__be32) +
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		    first*sizeof(struct igmpv3_grec)) {
			if (truncate && !first)
				break;	 /* truncate these */
			if (pgr)
				pgr->grec_nsrcs = htons(scount);
			if (skb)
				igmpv3_sendpack(skb);
			skb = igmpv3_newpack(dev, dev->mtu);
			first = 1;
			scount = 0;
		}
		if (first) {
			skb = add_grhead(skb, pmc, type, &pgr);
			first = 0;
		}
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		if (!skb)
			return NULL;
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		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
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		*psrc = psf->sf_inaddr;
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		scount++; stotal++;
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		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
		     type == IGMPV3_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;
	}
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empty_source:
	if (!stotal) {
		if (type == IGMPV3_ALLOW_NEW_SOURCES ||
		    type == IGMPV3_BLOCK_OLD_SOURCES)
			return skb;
		if (pmc->crcount || isquery) {
			/* make sure we have room for group header */
			if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
				igmpv3_sendpack(skb);
				skb = NULL; /* add_grhead will get a new one */
			}
			skb = add_grhead(skb, pmc, type, &pgr);
		}
	}
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	if (pgr)
		pgr->grec_nsrcs = htons(scount);

	if (isquery)
		pmc->gsquery = 0;	/* clear query state on report */
	return skb;
}

static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
{
	struct sk_buff *skb = NULL;
	int type;

	if (!pmc) {
		read_lock(&in_dev->mc_list_lock);
		for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
			if (pmc->multiaddr == IGMP_ALL_HOSTS)
				continue;
			spin_lock_bh(&pmc->lock);
			if (pmc->sfcount[MCAST_EXCLUDE])
				type = IGMPV3_MODE_IS_EXCLUDE;
			else
				type = IGMPV3_MODE_IS_INCLUDE;
			skb = add_grec(skb, pmc, type, 0, 0);
			spin_unlock_bh(&pmc->lock);
		}
		read_unlock(&in_dev->mc_list_lock);
	} else {
		spin_lock_bh(&pmc->lock);
		if (pmc->sfcount[MCAST_EXCLUDE])
			type = IGMPV3_MODE_IS_EXCLUDE;
		else
			type = IGMPV3_MODE_IS_INCLUDE;
		skb = add_grec(skb, pmc, type, 0, 0);
		spin_unlock_bh(&pmc->lock);
	}
	if (!skb)
		return 0;
	return igmpv3_sendpack(skb);
}

/*
 * remove zero-count source records from a source filter list
 */
static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
{
	struct ip_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 igmpv3_send_cr(struct in_device *in_dev)
{
	struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
	struct sk_buff *skb = NULL;
	int type, dtype;

	read_lock(&in_dev->mc_list_lock);
	spin_lock_bh(&in_dev->mc_tomb_lock);

	/* deleted MCA's */
	pmc_prev = NULL;
	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
		pmc_next = pmc->next;
		if (pmc->sfmode == MCAST_INCLUDE) {
			type = IGMPV3_BLOCK_OLD_SOURCES;
			dtype = IGMPV3_BLOCK_OLD_SOURCES;
			skb = add_grec(skb, pmc, type, 1, 0);
			skb = add_grec(skb, pmc, dtype, 1, 1);
		}
		if (pmc->crcount) {
			if (pmc->sfmode == MCAST_EXCLUDE) {
				type = IGMPV3_CHANGE_TO_INCLUDE;
				skb = add_grec(skb, pmc, type, 1, 0);
			}
576
			pmc->crcount--;
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			if (pmc->crcount == 0) {
				igmpv3_clear_zeros(&pmc->tomb);
				igmpv3_clear_zeros(&pmc->sources);
			}
		}
		if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
			if (pmc_prev)
				pmc_prev->next = pmc_next;
			else
				in_dev->mc_tomb = pmc_next;
			in_dev_put(pmc->interface);
			kfree(pmc);
		} else
			pmc_prev = pmc;
	}
	spin_unlock_bh(&in_dev->mc_tomb_lock);

	/* change recs */
	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
		spin_lock_bh(&pmc->lock);
		if (pmc->sfcount[MCAST_EXCLUDE]) {
			type = IGMPV3_BLOCK_OLD_SOURCES;
			dtype = IGMPV3_ALLOW_NEW_SOURCES;
		} else {
			type = IGMPV3_ALLOW_NEW_SOURCES;
			dtype = IGMPV3_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->crcount) {
			if (pmc->sfmode == MCAST_EXCLUDE)
				type = IGMPV3_CHANGE_TO_EXCLUDE;
			else
				type = IGMPV3_CHANGE_TO_INCLUDE;
			skb = add_grec(skb, pmc, type, 0, 0);
614
			pmc->crcount--;
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		}
		spin_unlock_bh(&pmc->lock);
	}
	read_unlock(&in_dev->mc_list_lock);

	if (!skb)
		return;
	(void) igmpv3_sendpack(skb);
}

static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
	int type)
{
	struct sk_buff *skb;
	struct iphdr *iph;
	struct igmphdr *ih;
	struct rtable *rt;
	struct net_device *dev = in_dev->dev;
633
	struct net *net = dev_net(dev);
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	__be32	group = pmc ? pmc->multiaddr : 0;
	__be32	dst;
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	if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
		return igmpv3_send_report(in_dev, pmc);
	else if (type == IGMP_HOST_LEAVE_MESSAGE)
		dst = IGMP_ALL_ROUTER;
	else
		dst = group;

	{
		struct flowi fl = { .oif = dev->ifindex,
				    .nl_u = { .ip4_u = { .daddr = dst } },
				    .proto = IPPROTO_IGMP };
648
		if (ip_route_output_key(net, &rt, &fl))
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			return -1;
	}
	if (rt->rt_src == 0) {
		ip_rt_put(rt);
		return -1;
	}

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	skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
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	if (skb == NULL) {
		ip_rt_put(rt);
		return -1;
	}

	skb->dst = &rt->u.dst;

	skb_reserve(skb, LL_RESERVED_SPACE(dev));

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	skb_reset_network_header(skb);
667
	iph = ip_hdr(skb);
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	skb_put(skb, sizeof(struct iphdr) + 4);
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	iph->version  = 4;
	iph->ihl      = (sizeof(struct iphdr)+4)>>2;
	iph->tos      = 0xc0;
	iph->frag_off = htons(IP_DF);
	iph->ttl      = 1;
	iph->daddr    = dst;
	iph->saddr    = rt->rt_src;
	iph->protocol = IPPROTO_IGMP;
	ip_select_ident(iph, &rt->u.dst, NULL);
	((u8*)&iph[1])[0] = IPOPT_RA;
	((u8*)&iph[1])[1] = 4;
	((u8*)&iph[1])[2] = 0;
	((u8*)&iph[1])[3] = 0;

	ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
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	ih->type = type;
	ih->code = 0;
	ih->csum = 0;
	ih->group = group;
	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
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	return ip_local_out(skb);
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}

static void igmp_gq_timer_expire(unsigned long data)
{
	struct in_device *in_dev = (struct in_device *)data;

	in_dev->mr_gq_running = 0;
	igmpv3_send_report(in_dev, NULL);
	__in_dev_put(in_dev);
}

static void igmp_ifc_timer_expire(unsigned long data)
{
	struct in_device *in_dev = (struct in_device *)data;

	igmpv3_send_cr(in_dev);
	if (in_dev->mr_ifc_count) {
		in_dev->mr_ifc_count--;
		igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
	}
	__in_dev_put(in_dev);
}

static void igmp_ifc_event(struct in_device *in_dev)
{
	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
		return;
719
	in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
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		IGMP_Unsolicited_Report_Count;
	igmp_ifc_start_timer(in_dev, 1);
}


static void igmp_timer_expire(unsigned long data)
{
	struct ip_mc_list *im=(struct ip_mc_list *)data;
	struct in_device *in_dev = im->interface;

	spin_lock(&im->lock);
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	im->tm_running = 0;
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	if (im->unsolicit_count) {
		im->unsolicit_count--;
		igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
	}
	im->reporter = 1;
	spin_unlock(&im->lock);

	if (IGMP_V1_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
	else if (IGMP_V2_SEEN(in_dev))
		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
	else
		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);

	ip_ma_put(im);
}

750
/* mark EXCLUDE-mode sources */
751
static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
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{
	struct ip_sf_list *psf;
	int i, scount;

756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
	scount = 0;
	for (psf=pmc->sources; psf; psf=psf->sf_next) {
		if (scount == nsrcs)
			break;
		for (i=0; i<nsrcs; i++) {
			/* skip inactive filters */
			if (pmc->sfcount[MCAST_INCLUDE] ||
			    pmc->sfcount[MCAST_EXCLUDE] !=
			    psf->sf_count[MCAST_EXCLUDE])
				continue;
			if (srcs[i] == psf->sf_inaddr) {
				scount++;
				break;
			}
		}
	}
	pmc->gsquery = 0;
	if (scount == nsrcs)	/* all sources excluded */
		return 0;
	return 1;
}

778
static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
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{
	struct ip_sf_list *psf;
	int i, scount;

	if (pmc->sfmode == MCAST_EXCLUDE)
		return igmp_xmarksources(pmc, nsrcs, srcs);

	/* mark INCLUDE-mode sources */
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	scount = 0;
	for (psf=pmc->sources; psf; psf=psf->sf_next) {
		if (scount == nsrcs)
			break;
		for (i=0; i<nsrcs; i++)
			if (srcs[i] == psf->sf_inaddr) {
				psf->sf_gsresp = 1;
				scount++;
				break;
			}
	}
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	if (!scount) {
		pmc->gsquery = 0;
		return 0;
	}
	pmc->gsquery = 1;
	return 1;
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}

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static void igmp_heard_report(struct in_device *in_dev, __be32 group)
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{
	struct ip_mc_list *im;

	/* Timers are only set for non-local groups */

	if (group == IGMP_ALL_HOSTS)
		return;

	read_lock(&in_dev->mc_list_lock);
	for (im=in_dev->mc_list; im!=NULL; im=im->next) {
		if (im->multiaddr == group) {
			igmp_stop_timer(im);
			break;
		}
	}
	read_unlock(&in_dev->mc_list_lock);
}

static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
	int len)
{
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	struct igmphdr 		*ih = igmp_hdr(skb);
	struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
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	struct ip_mc_list	*im;
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	__be32			group = ih->group;
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	int			max_delay;
	int			mark = 0;


	if (len == 8) {
		if (ih->code == 0) {
			/* Alas, old v1 router presents here. */
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			max_delay = IGMP_Query_Response_Interval;
			in_dev->mr_v1_seen = jiffies +
				IGMP_V1_Router_Present_Timeout;
			group = 0;
		} else {
			/* v2 router present */
			max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
			in_dev->mr_v2_seen = jiffies +
				IGMP_V2_Router_Present_Timeout;
		}
		/* cancel the interface change timer */
		in_dev->mr_ifc_count = 0;
		if (del_timer(&in_dev->mr_ifc_timer))
			__in_dev_put(in_dev);
		/* clear deleted report items */
		igmpv3_clear_delrec(in_dev);
	} else if (len < 12) {
		return;	/* ignore bogus packet; freed by caller */
	} else { /* v3 */
		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
			return;
861

862
		ih3 = igmpv3_query_hdr(skb);
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		if (ih3->nsrcs) {
864
			if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
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					   + ntohs(ih3->nsrcs)*sizeof(__be32)))
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				return;
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			ih3 = igmpv3_query_hdr(skb);
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		}

		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
		if (!max_delay)
			max_delay = 1;	/* can't mod w/ 0 */
		in_dev->mr_maxdelay = max_delay;
		if (ih3->qrv)
			in_dev->mr_qrv = ih3->qrv;
		if (!group) { /* general query */
			if (ih3->nsrcs)
				return;	/* no sources allowed */
			igmp_gq_start_timer(in_dev);
			return;
		}
		/* mark sources to include, if group & source-specific */
		mark = ih3->nsrcs != 0;
	}

	/*
	 * - Start the timers in all of our membership records
	 *   that the query applies to for the interface on
	 *   which the query arrived excl. those that belong
	 *   to a "local" group (224.0.0.X)
	 * - For timers already running check if they need to
	 *   be reset.
	 * - Use the igmp->igmp_code field as the maximum
	 *   delay possible
	 */
	read_lock(&in_dev->mc_list_lock);
	for (im=in_dev->mc_list; im!=NULL; im=im->next) {
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		int changed;

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		if (group && group != im->multiaddr)
			continue;
		if (im->multiaddr == IGMP_ALL_HOSTS)
			continue;
		spin_lock_bh(&im->lock);
		if (im->tm_running)
			im->gsquery = im->gsquery && mark;
		else
			im->gsquery = mark;
909
		changed = !im->gsquery ||
910
			igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
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		spin_unlock_bh(&im->lock);
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		if (changed)
			igmp_mod_timer(im, max_delay);
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	}
	read_unlock(&in_dev->mc_list_lock);
}

int igmp_rcv(struct sk_buff *skb)
{
	/* This basically follows the spec line by line -- see RFC1112 */
	struct igmphdr *ih;
	struct in_device *in_dev = in_dev_get(skb->dev);
	int len = skb->len;

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	if (in_dev == NULL)
		goto drop;
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928
	if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
929
		goto drop_ref;
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	switch (skb->ip_summed) {
932
	case CHECKSUM_COMPLETE:
933
		if (!csum_fold(skb->csum))
934 935 936 937 938
			break;
		/* fall through */
	case CHECKSUM_NONE:
		skb->csum = 0;
		if (__skb_checksum_complete(skb))
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			goto drop_ref;
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	}

942
	ih = igmp_hdr(skb);
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	switch (ih->type) {
	case IGMP_HOST_MEMBERSHIP_QUERY:
		igmp_heard_query(in_dev, skb, len);
		break;
	case IGMP_HOST_MEMBERSHIP_REPORT:
	case IGMPV2_HOST_MEMBERSHIP_REPORT:
	case IGMPV3_HOST_MEMBERSHIP_REPORT:
		/* Is it our report looped back? */
951
		if (skb->rtable->fl.iif == 0)
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			break;
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		/* don't rely on MC router hearing unicast reports */
		if (skb->pkt_type == PACKET_MULTICAST ||
		    skb->pkt_type == PACKET_BROADCAST)
			igmp_heard_report(in_dev, ih->group);
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		break;
	case IGMP_PIM:
#ifdef CONFIG_IP_PIMSM_V1
		in_dev_put(in_dev);
		return pim_rcv_v1(skb);
#endif
	case IGMP_DVMRP:
	case IGMP_TRACE:
	case IGMP_HOST_LEAVE_MESSAGE:
	case IGMP_MTRACE:
	case IGMP_MTRACE_RESP:
		break;
	default:
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		break;
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	}
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drop_ref:
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	in_dev_put(in_dev);
975
drop:
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	kfree_skb(skb);
	return 0;
}

#endif


/*
 *	Add a filter to a device
 */

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static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
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{
	char buf[MAX_ADDR_LEN];
	struct net_device *dev = in_dev->dev;

	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
	   We will get multicast token leakage, when IFF_MULTICAST
	   is changed. This check should be done in dev->set_multicast_list
	   routine. Something sort of:
	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
	   --ANK
	   */
	if (arp_mc_map(addr, buf, dev, 0) == 0)
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		dev_mc_add(dev, buf, dev->addr_len, 0);
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}

/*
 *	Remove a filter from a device
 */

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static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
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{
	char buf[MAX_ADDR_LEN];
	struct net_device *dev = in_dev->dev;

	if (arp_mc_map(addr, buf, dev, 0) == 0)
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		dev_mc_delete(dev, buf, dev->addr_len, 0);
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}

#ifdef CONFIG_IP_MULTICAST
/*
 * deleted ip_mc_list manipulation
 */
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
{
	struct ip_mc_list *pmc;

	/* this is an "ip_mc_list" 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.
	 */
1030
	pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
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	if (!pmc)
		return;
	spin_lock_bh(&im->lock);
	pmc->interface = im->interface;
	in_dev_hold(in_dev);
	pmc->multiaddr = im->multiaddr;
	pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
		IGMP_Unsolicited_Report_Count;
	pmc->sfmode = im->sfmode;
	if (pmc->sfmode == MCAST_INCLUDE) {
		struct ip_sf_list *psf;

		pmc->tomb = im->tomb;
		pmc->sources = im->sources;
		im->tomb = im->sources = NULL;
		for (psf=pmc->sources; psf; psf=psf->sf_next)
			psf->sf_crcount = pmc->crcount;
	}
	spin_unlock_bh(&im->lock);

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc->next = in_dev->mc_tomb;
	in_dev->mc_tomb = pmc;
	spin_unlock_bh(&in_dev->mc_tomb_lock);
}

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static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
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{
	struct ip_mc_list *pmc, *pmc_prev;
	struct ip_sf_list *psf, *psf_next;

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc_prev = NULL;
	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
		if (pmc->multiaddr == multiaddr)
			break;
		pmc_prev = pmc;
	}
	if (pmc) {
		if (pmc_prev)
			pmc_prev->next = pmc->next;
		else
			in_dev->mc_tomb = pmc->next;
	}
	spin_unlock_bh(&in_dev->mc_tomb_lock);
	if (pmc) {
		for (psf=pmc->tomb; psf; psf=psf_next) {
			psf_next = psf->sf_next;
			kfree(psf);
		}
		in_dev_put(pmc->interface);
		kfree(pmc);
	}
}

static void igmpv3_clear_delrec(struct in_device *in_dev)
{
	struct ip_mc_list *pmc, *nextpmc;

	spin_lock_bh(&in_dev->mc_tomb_lock);
	pmc = in_dev->mc_tomb;
	in_dev->mc_tomb = NULL;
	spin_unlock_bh(&in_dev->mc_tomb_lock);

	for (; pmc; pmc = nextpmc) {
		nextpmc = pmc->next;
		ip_mc_clear_src(pmc);
		in_dev_put(pmc->interface);
		kfree(pmc);
	}
	/* clear dead sources, too */
	read_lock(&in_dev->mc_list_lock);
	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
		struct ip_sf_list *psf, *psf_next;

		spin_lock_bh(&pmc->lock);
		psf = pmc->tomb;
		pmc->tomb = NULL;
		spin_unlock_bh(&pmc->lock);
		for (; psf; psf=psf_next) {
			psf_next = psf->sf_next;
			kfree(psf);
		}
	}
	read_unlock(&in_dev->mc_list_lock);
}
#endif

static void igmp_group_dropped(struct ip_mc_list *im)
{
	struct in_device *in_dev = im->interface;
#ifdef CONFIG_IP_MULTICAST
	int reporter;
#endif

	if (im->loaded) {
		im->loaded = 0;
		ip_mc_filter_del(in_dev, im->multiaddr);
	}

#ifdef CONFIG_IP_MULTICAST
	if (im->multiaddr == IGMP_ALL_HOSTS)
		return;

	reporter = im->reporter;
	igmp_stop_timer(im);

	if (!in_dev->dead) {
		if (IGMP_V1_SEEN(in_dev))
			goto done;
		if (IGMP_V2_SEEN(in_dev)) {
			if (reporter)
				igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
			goto done;
		}
		/* IGMPv3 */
		igmpv3_add_delrec(in_dev, im);

		igmp_ifc_event(in_dev);
	}
done:
#endif
	ip_mc_clear_src(im);
}

static void igmp_group_added(struct ip_mc_list *im)
{
	struct in_device *in_dev = im->interface;

	if (im->loaded == 0) {
		im->loaded = 1;
		ip_mc_filter_add(in_dev, im->multiaddr);
	}

#ifdef CONFIG_IP_MULTICAST
	if (im->multiaddr == IGMP_ALL_HOSTS)
		return;

	if (in_dev->dead)
		return;
	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
		spin_lock_bh(&im->lock);
		igmp_start_timer(im, IGMP_Initial_Report_Delay);
		spin_unlock_bh(&im->lock);
		return;
	}
	/* else, v3 */

	im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
		IGMP_Unsolicited_Report_Count;
	igmp_ifc_event(in_dev);
#endif
}


/*
 *	Multicast list managers
 */


/*
 *	A socket has joined a multicast group on device dev.
 */

1195
void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
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{
	struct ip_mc_list *im;

	ASSERT_RTNL();

	for (im=in_dev->mc_list; im; im=im->next) {
		if (im->multiaddr == addr) {
			im->users++;
			ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
			goto out;
		}
	}

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	im = kmalloc(sizeof(*im), GFP_KERNEL);
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	if (!im)
		goto out;

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	im->users = 1;
	im->interface = in_dev;
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	in_dev_hold(in_dev);
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	im->multiaddr = addr;
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	/* initial mode is (EX, empty) */
	im->sfmode = MCAST_EXCLUDE;
	im->sfcount[MCAST_INCLUDE] = 0;
	im->sfcount[MCAST_EXCLUDE] = 1;
	im->sources = NULL;
	im->tomb = NULL;
	im->crcount = 0;
	atomic_set(&im->refcnt, 1);
	spin_lock_init(&im->lock);
#ifdef CONFIG_IP_MULTICAST
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	im->tm_running = 0;
1228
	setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
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	im->unsolicit_count = IGMP_Unsolicited_Report_Count;
	im->reporter = 0;
	im->gsquery = 0;
#endif
	im->loaded = 0;
	write_lock_bh(&in_dev->mc_list_lock);
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	im->next = in_dev->mc_list;
	in_dev->mc_list = im;
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	in_dev->mc_count++;
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	write_unlock_bh(&in_dev->mc_list_lock);
#ifdef CONFIG_IP_MULTICAST
	igmpv3_del_delrec(in_dev, im->multiaddr);
#endif
	igmp_group_added(im);
	if (!in_dev->dead)
		ip_rt_multicast_event(in_dev);
out:
	return;
}

1249 1250 1251 1252 1253
/*
 *	Resend IGMP JOIN report; used for bonding.
 */
void ip_mc_rejoin_group(struct ip_mc_list *im)
{
1254
#ifdef CONFIG_IP_MULTICAST
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
	struct in_device *in_dev = im->interface;

	if (im->multiaddr == IGMP_ALL_HOSTS)
		return;

	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
		igmp_mod_timer(im, IGMP_Initial_Report_Delay);
		return;
	}
	/* else, v3 */
	im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
		IGMP_Unsolicited_Report_Count;
	igmp_ifc_event(in_dev);
#endif
}

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/*
 *	A socket has left a multicast group on device dev
 */

1275
void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
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{
	struct ip_mc_list *i, **ip;
1278

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	ASSERT_RTNL();
1280

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	for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
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		if (i->multiaddr == addr) {
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			if (--i->users == 0) {
				write_lock_bh(&in_dev->mc_list_lock);
				*ip = i->next;
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				in_dev->mc_count--;
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				write_unlock_bh(&in_dev->mc_list_lock);
				igmp_group_dropped(i);

				if (!in_dev->dead)
					ip_rt_multicast_event(in_dev);

				ip_ma_put(i);
				return;
			}
			break;
		}
	}
}

/* Device going down */

void ip_mc_down(struct in_device *in_dev)
{
	struct ip_mc_list *i;

	ASSERT_RTNL();

	for (i=in_dev->mc_list; i; i=i->next)
		igmp_group_dropped(i);

#ifdef CONFIG_IP_MULTICAST
	in_dev->mr_ifc_count = 0;
	if (del_timer(&in_dev->mr_ifc_timer))
		__in_dev_put(in_dev);
	in_dev->mr_gq_running = 0;
	if (del_timer(&in_dev->mr_gq_timer))
		__in_dev_put(in_dev);
	igmpv3_clear_delrec(in_dev);
#endif

	ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
}

void ip_mc_init_dev(struct in_device *in_dev)
{
	ASSERT_RTNL();

	in_dev->mc_tomb = NULL;
#ifdef CONFIG_IP_MULTICAST
	in_dev->mr_gq_running = 0;
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	setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
			(unsigned long)in_dev);
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	in_dev->mr_ifc_count = 0;
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	in_dev->mc_count     = 0;
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	setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
			(unsigned long)in_dev);
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	in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
#endif

	rwlock_init(&in_dev->mc_list_lock);
	spin_lock_init(&in_dev->mc_tomb_lock);
}

/* Device going up */

void ip_mc_up(struct in_device *in_dev)
{
	struct ip_mc_list *i;

	ASSERT_RTNL();

	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);

	for (i=in_dev->mc_list; i; i=i->next)
		igmp_group_added(i);
}

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

void ip_mc_destroy_dev(struct in_device *in_dev)
{
	struct ip_mc_list *i;

	ASSERT_RTNL();

	/* Deactivate timers */
	ip_mc_down(in_dev);

	write_lock_bh(&in_dev->mc_list_lock);
	while ((i = in_dev->mc_list) != NULL) {
		in_dev->mc_list = i->next;
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		in_dev->mc_count--;
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		write_unlock_bh(&in_dev->mc_list_lock);
		igmp_group_dropped(i);
		ip_ma_put(i);

		write_lock_bh(&in_dev->mc_list_lock);
	}
	write_unlock_bh(&in_dev->mc_list_lock);
}

1385
static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
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{
	struct flowi fl = { .nl_u = { .ip4_u =
				      { .daddr = imr->imr_multiaddr.s_addr } } };
	struct rtable *rt;
	struct net_device *dev = NULL;
	struct in_device *idev = NULL;

	if (imr->imr_ifindex) {
1394
		idev = inetdev_by_index(net, imr->imr_ifindex);
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		if (idev)
			__in_dev_put(idev);
		return idev;
	}
	if (imr->imr_address.s_addr) {
1400
		dev = ip_dev_find(net, imr->imr_address.s_addr);
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		if (!dev)
			return NULL;
1403
		dev_put(dev);
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	}

1406
	if (!dev && !ip_route_output_key(net, &rt, &fl)) {
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		dev = rt->u.dst.dev;
		ip_rt_put(rt);
	}
	if (dev) {
		imr->imr_ifindex = dev->ifindex;
1412
		idev = __in_dev_get_rtnl(dev);
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	}
	return idev;
}

/*
 *	Join a socket to a group
 */
1420 1421
int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
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static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1425
	__be32 *psfsrc)
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{
	struct ip_sf_list *psf, *psf_prev;
	int rv = 0;

	psf_prev = NULL;
	for (psf=pmc->sources; psf; psf=psf->sf_next) {
		if (psf->sf_inaddr == *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[sfmode] == 0) {
		ip_rt_multicast_event(pmc->interface);
	}
	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
#ifdef CONFIG_IP_MULTICAST
		struct in_device *in_dev = pmc->interface;
#endif

		/* no more filters for this source */
		if (psf_prev)
			psf_prev->sf_next = psf->sf_next;
		else
			pmc->sources = psf->sf_next;
#ifdef CONFIG_IP_MULTICAST
		if (psf->sf_oldin &&
		    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1457
			psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
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				IGMP_Unsolicited_Report_Count;
			psf->sf_next = pmc->tomb;
			pmc->tomb = psf;
			rv = 1;
		} else
#endif
			kfree(psf);
	}
	return rv;
}

#ifndef CONFIG_IP_MULTICAST
#define igmp_ifc_event(x)	do { } while (0)
#endif

1473 1474
static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta)
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{
	struct ip_mc_list *pmc;
	int	changerec = 0;
	int	i, err;

	if (!in_dev)
		return -ENODEV;
	read_lock(&in_dev->mc_list_lock);
	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
		if (*pmca == pmc->multiaddr)
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		read_unlock(&in_dev->mc_list_lock);
		return -ESRCH;
	}
	spin_lock_bh(&pmc->lock);
	read_unlock(&in_dev->mc_list_lock);
#ifdef CONFIG_IP_MULTICAST
	sf_markstate(pmc);
#endif
	if (!delta) {
		err = -EINVAL;
		if (!pmc->sfcount[sfmode])
			goto out_unlock;
		pmc->sfcount[sfmode]--;
	}
	err = 0;
	for (i=0; i<sfcount; i++) {
		int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);

		changerec |= rv > 0;
		if (!err && rv < 0)
			err = rv;
	}
	if (pmc->sfmode == MCAST_EXCLUDE &&
	    pmc->sfcount[MCAST_EXCLUDE] == 0 &&
	    pmc->sfcount[MCAST_INCLUDE]) {
#ifdef CONFIG_IP_MULTICAST
		struct ip_sf_list *psf;
#endif

		/* filter mode change */
		pmc->sfmode = MCAST_INCLUDE;
#ifdef CONFIG_IP_MULTICAST
1521
		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
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			IGMP_Unsolicited_Report_Count;
		in_dev->mr_ifc_count = pmc->crcount;
		for (psf=pmc->sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		igmp_ifc_event(pmc->interface);
	} else if (sf_setstate(pmc) || changerec) {
		igmp_ifc_event(pmc->interface);
#endif
	}
out_unlock:
	spin_unlock_bh(&pmc->lock);
	return err;
}

/*
 * Add multicast single-source filter to the interface list
 */
static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1540
	__be32 *psfsrc, int delta)
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{
	struct ip_sf_list *psf, *psf_prev;

	psf_prev = NULL;
	for (psf=pmc->sources; psf; psf=psf->sf_next) {
		if (psf->sf_inaddr == *psfsrc)
			break;
		psf_prev = psf;
	}
	if (!psf) {
1551
		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
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		if (!psf)
			return -ENOBUFS;
		psf->sf_inaddr = *psfsrc;
		if (psf_prev) {
			psf_prev->sf_next = psf;
		} else
			pmc->sources = psf;
	}
	psf->sf_count[sfmode]++;
	if (psf->sf_count[sfmode] == 1) {
		ip_rt_multicast_event(pmc->interface);
	}
	return 0;
}

#ifdef CONFIG_IP_MULTICAST
static void sf_markstate(struct ip_mc_list *pmc)
{
	struct ip_sf_list *psf;
	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];

	for (psf=pmc->sources; psf; psf=psf->sf_next)
		if (pmc->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 ip_mc_list *pmc)
{
1584
	struct ip_sf_list *psf, *dpsf;
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	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
	int qrv = pmc->interface->mr_qrv;
	int new_in, rv;

	rv = 0;
	for (psf=pmc->sources; psf; psf=psf->sf_next) {
		if (pmc->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;
1596 1597
		if (new_in) {
			if (!psf->sf_oldin) {
A
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				struct ip_sf_list *prev = NULL;
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635

				for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
					if (dpsf->sf_inaddr == psf->sf_inaddr)
						break;
					prev = dpsf;
				}
				if (dpsf) {
					if (prev)
						prev->sf_next = dpsf->sf_next;
					else
						pmc->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->tomb; dpsf; dpsf=dpsf->sf_next)
				if (dpsf->sf_inaddr == psf->sf_inaddr)
					break;
			if (!dpsf) {
				dpsf = (struct ip_sf_list *)
					kmalloc(sizeof(*dpsf), GFP_ATOMIC);
				if (!dpsf)
					continue;
				*dpsf = *psf;
				/* pmc->lock held by callers */
				dpsf->sf_next = pmc->tomb;
				pmc->tomb = dpsf;
			}
			dpsf->sf_crcount = qrv;
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			rv++;
		}
	}
	return rv;
}
#endif

/*
 * Add multicast source filter list to the interface list
 */
1646 1647
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
			 int sfcount, __be32 *psfsrc, int delta)
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{
	struct ip_mc_list *pmc;
	int	isexclude;
	int	i, err;

	if (!in_dev)
		return -ENODEV;
	read_lock(&in_dev->mc_list_lock);
	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
		if (*pmca == pmc->multiaddr)
			break;
	}
	if (!pmc) {
		/* MCA not found?? bug */
		read_unlock(&in_dev->mc_list_lock);
		return -ESRCH;
	}
	spin_lock_bh(&pmc->lock);
	read_unlock(&in_dev->mc_list_lock);

#ifdef CONFIG_IP_MULTICAST
	sf_markstate(pmc);
#endif
	isexclude = pmc->sfmode == MCAST_EXCLUDE;
	if (!delta)
		pmc->sfcount[sfmode]++;
	err = 0;
	for (i=0; i<sfcount; i++) {
		err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
		if (err)
			break;
	}
	if (err) {
		int j;

		pmc->sfcount[sfmode]--;
		for (j=0; j<i; j++)
			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
#ifdef CONFIG_IP_MULTICAST
		struct ip_sf_list *psf;
S
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1689
		in_dev = pmc->interface;
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1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
#endif

		/* filter mode change */
		if (pmc->sfcount[MCAST_EXCLUDE])
			pmc->sfmode = MCAST_EXCLUDE;
		else if (pmc->sfcount[MCAST_INCLUDE])
			pmc->sfmode = MCAST_INCLUDE;
#ifdef CONFIG_IP_MULTICAST
		/* else no filters; keep old mode for reports */

1700
		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
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			IGMP_Unsolicited_Report_Count;
		in_dev->mr_ifc_count = pmc->crcount;
		for (psf=pmc->sources; psf; psf = psf->sf_next)
			psf->sf_crcount = 0;
		igmp_ifc_event(in_dev);
	} else if (sf_setstate(pmc)) {
		igmp_ifc_event(in_dev);
#endif
	}
	spin_unlock_bh(&pmc->lock);
	return err;
}

static void ip_mc_clear_src(struct ip_mc_list *pmc)
{
	struct ip_sf_list *psf, *nextpsf;

	for (psf=pmc->tomb; psf; psf=nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
	pmc->tomb = NULL;
	for (psf=pmc->sources; psf; psf=nextpsf) {
		nextpsf = psf->sf_next;
		kfree(psf);
	}
	pmc->sources = NULL;
	pmc->sfmode = MCAST_EXCLUDE;
1729
	pmc->sfcount[MCAST_INCLUDE] = 0;
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	pmc->sfcount[MCAST_EXCLUDE] = 1;
}


/*
 * Join a multicast group
 */
int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
{
	int err;
1740
	__be32 addr = imr->imr_multiaddr.s_addr;
J
Jianjun Kong 已提交
1741
	struct ip_mc_socklist *iml = NULL, *i;
L
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1742 1743
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
1744
	struct net *net = sock_net(sk);
1745
	int ifindex;
L
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1746 1747
	int count = 0;

1748
	if (!ipv4_is_multicast(addr))
L
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1749 1750
		return -EINVAL;

1751
	rtnl_lock();
L
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1752

1753
	in_dev = ip_mc_find_dev(net, imr);
L
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1754 1755 1756 1757 1758 1759 1760 1761

	if (!in_dev) {
		iml = NULL;
		err = -ENODEV;
		goto done;
	}

	err = -EADDRINUSE;
1762
	ifindex = imr->imr_ifindex;
L
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1763
	for (i = inet->mc_list; i; i = i->next) {
1764 1765
		if (i->multi.imr_multiaddr.s_addr == addr &&
		    i->multi.imr_ifindex == ifindex)
L
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1766 1767 1768 1769
			goto done;
		count++;
	}
	err = -ENOBUFS;
1770 1771
	if (count >= sysctl_igmp_max_memberships)
		goto done;
J
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	iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1773
	if (iml == NULL)
L
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1774
		goto done;
1775

L
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	memcpy(&iml->multi, imr, sizeof(*imr));
	iml->next = inet->mc_list;
	iml->sflist = NULL;
	iml->sfmode = MCAST_EXCLUDE;
	inet->mc_list = iml;
	ip_mc_inc_group(in_dev, addr);
	err = 0;
done:
1784
	rtnl_unlock();
L
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1785 1786 1787 1788 1789 1790 1791 1792
	return err;
}

static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
			   struct in_device *in_dev)
{
	int err;

S
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	if (iml->sflist == NULL) {
L
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		/* any-source empty exclude case */
		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
			iml->sfmode, 0, NULL, 0);
	}
	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
			iml->sfmode, iml->sflist->sl_count,
			iml->sflist->sl_addr, 0);
	sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
	iml->sflist = NULL;
	return err;
}

/*
 *	Ask a socket to leave a group.
 */

int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *iml, **imlp;
1814
	struct in_device *in_dev;
1815
	struct net *net = sock_net(sk);
1816
	__be32 group = imr->imr_multiaddr.s_addr;
1817
	u32 ifindex;
1818
	int ret = -EADDRNOTAVAIL;
L
Linus Torvalds 已提交
1819 1820

	rtnl_lock();
1821
	in_dev = ip_mc_find_dev(net, imr);
1822
	ifindex = imr->imr_ifindex;
L
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1823
	for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1824 1825 1826 1827 1828 1829 1830 1831
		if (iml->multi.imr_multiaddr.s_addr != group)
			continue;
		if (ifindex) {
			if (iml->multi.imr_ifindex != ifindex)
				continue;
		} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
				iml->multi.imr_address.s_addr)
			continue;
L
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1833
		(void) ip_mc_leave_src(sk, iml, in_dev);
L
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1835 1836 1837
		*imlp = iml->next;

		if (in_dev)
1838
			ip_mc_dec_group(in_dev, group);
1839 1840 1841
		rtnl_unlock();
		sock_kfree_s(sk, iml, sizeof(*iml));
		return 0;
L
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1842
	}
1843 1844
	if (!in_dev)
		ret = -ENODEV;
L
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1845
	rtnl_unlock();
1846
	return ret;
L
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}

int ip_mc_source(int add, int omode, struct sock *sk, struct
	ip_mreq_source *mreqs, int ifindex)
{
	int err;
	struct ip_mreqn imr;
A
Al Viro 已提交
1854
	__be32 addr = mreqs->imr_multiaddr;
L
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1855 1856 1857 1858
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev = NULL;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;
1859
	struct net *net = sock_net(sk);
1860
	int leavegroup = 0;
L
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1861 1862
	int i, j, rv;

1863
	if (!ipv4_is_multicast(addr))
L
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1864 1865
		return -EINVAL;

1866
	rtnl_lock();
L
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1867 1868 1869 1870

	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
	imr.imr_address.s_addr = mreqs->imr_interface;
	imr.imr_ifindex = ifindex;
1871
	in_dev = ip_mc_find_dev(net, &imr);
L
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	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}
	err = -EADDRNOTAVAIL;

	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1880 1881
		if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
		    && pmc->multi.imr_ifindex == imr.imr_ifindex)
L
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1882 1883
			break;
	}
1884 1885
	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
L
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1886
		goto done;
1887
	}
L
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1888 1889
	/* if a source filter was set, must be the same mode as before */
	if (pmc->sflist) {
1890 1891
		if (pmc->sfmode != omode) {
			err = -EINVAL;
L
Linus Torvalds 已提交
1892
			goto done;
1893
		}
L
Linus Torvalds 已提交
1894 1895 1896
	} else if (pmc->sfmode != omode) {
		/* allow mode switches for empty-set filters */
		ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1897
		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
L
Linus Torvalds 已提交
1898 1899 1900 1901 1902 1903 1904
			NULL, 0);
		pmc->sfmode = omode;
	}

	psl = pmc->sflist;
	if (!add) {
		if (!psl)
1905
			goto done;	/* err = -EADDRNOTAVAIL */
L
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1906 1907 1908
		rv = !0;
		for (i=0; i<psl->sl_count; i++) {
			rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
A
Al Viro 已提交
1909
				sizeof(__be32));
L
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1910 1911 1912 1913
			if (rv == 0)
				break;
		}
		if (rv)		/* source not found */
1914
			goto done;	/* err = -EADDRNOTAVAIL */
L
Linus Torvalds 已提交
1915

1916 1917 1918 1919 1920 1921
		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
			leavegroup = 1;
			goto done;
		}

L
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		/* update the interface filter */
1923
		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
L
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1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943
			&mreqs->imr_sourceaddr, 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_igmp_max_msf) {
		err = -ENOBUFS;
		goto done;
	}
	if (!psl || psl->sl_count == psl->sl_max) {
		struct ip_sf_socklist *newpsl;
		int count = IP_SFBLOCK;

		if (psl)
			count += psl->sl_max;
1944
		newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
L
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1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = count;
		newpsl->sl_count = count - IP_SFBLOCK;
		if (psl) {
			for (i=0; i<psl->sl_count; i++)
				newpsl->sl_addr[i] = psl->sl_addr[i];
			sock_kfree_s(sk, psl, IP_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], &mreqs->imr_sourceaddr,
A
Al Viro 已提交
1961
			sizeof(__be32));
L
Linus Torvalds 已提交
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
		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] = mreqs->imr_sourceaddr;
	psl->sl_count++;
	err = 0;
	/* update the interface list */
1973
	ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
L
Linus Torvalds 已提交
1974 1975
		&mreqs->imr_sourceaddr, 1);
done:
1976
	rtnl_unlock();
1977 1978
	if (leavegroup)
		return ip_mc_leave_group(sk, &imr);
L
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1979 1980 1981 1982 1983
	return err;
}

int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
{
1984
	int err = 0;
L
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1985
	struct ip_mreqn	imr;
A
Al Viro 已提交
1986
	__be32 addr = msf->imsf_multiaddr;
L
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1987 1988 1989 1990
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *newpsl, *psl;
1991
	struct net *net = sock_net(sk);
1992
	int leavegroup = 0;
L
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1993

1994
	if (!ipv4_is_multicast(addr))
L
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1995 1996 1997 1998 1999
		return -EINVAL;
	if (msf->imsf_fmode != MCAST_INCLUDE &&
	    msf->imsf_fmode != MCAST_EXCLUDE)
		return -EINVAL;

2000
	rtnl_lock();
L
Linus Torvalds 已提交
2001 2002 2003 2004

	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
	imr.imr_address.s_addr = msf->imsf_interface;
	imr.imr_ifindex = ifindex;
2005
	in_dev = ip_mc_find_dev(net, &imr);
L
Linus Torvalds 已提交
2006 2007 2008 2009 2010 2011

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}

2012 2013 2014 2015 2016 2017
	/* special case - (INCLUDE, empty) == LEAVE_GROUP */
	if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
		leavegroup = 1;
		goto done;
	}

L
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2018 2019 2020 2021 2022
	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
		    pmc->multi.imr_ifindex == imr.imr_ifindex)
			break;
	}
2023 2024
	if (!pmc) {		/* must have a prior join */
		err = -EINVAL;
L
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2025
		goto done;
2026
	}
L
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2027
	if (msf->imsf_numsrc) {
2028 2029
		newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
							   GFP_KERNEL);
L
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2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042
		if (!newpsl) {
			err = -ENOBUFS;
			goto done;
		}
		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
		memcpy(newpsl->sl_addr, msf->imsf_slist,
			msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
		if (err) {
			sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
			goto done;
		}
2043
	} else {
L
Linus Torvalds 已提交
2044
		newpsl = NULL;
2045 2046 2047
		(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
				     msf->imsf_fmode, 0, NULL, 0);
	}
L
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2048 2049 2050 2051 2052 2053 2054 2055 2056 2057
	psl = pmc->sflist;
	if (psl) {
		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
			psl->sl_count, psl->sl_addr, 0);
		sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
	} else
		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
			0, NULL, 0);
	pmc->sflist = newpsl;
	pmc->sfmode = msf->imsf_fmode;
2058
	err = 0;
L
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2059
done:
2060
	rtnl_unlock();
2061 2062
	if (leavegroup)
		err = ip_mc_leave_group(sk, &imr);
L
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2063 2064 2065 2066 2067 2068 2069 2070
	return err;
}

int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
	struct ip_msfilter __user *optval, int __user *optlen)
{
	int err, len, count, copycount;
	struct ip_mreqn	imr;
A
Al Viro 已提交
2071
	__be32 addr = msf->imsf_multiaddr;
L
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2072 2073 2074 2075
	struct ip_mc_socklist *pmc;
	struct in_device *in_dev;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;
2076
	struct net *net = sock_net(sk);
L
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2077

2078
	if (!ipv4_is_multicast(addr))
L
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2079 2080
		return -EINVAL;

2081
	rtnl_lock();
L
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2082 2083 2084 2085

	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
	imr.imr_address.s_addr = msf->imsf_interface;
	imr.imr_ifindex = 0;
2086
	in_dev = ip_mc_find_dev(net, &imr);
L
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2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102

	if (!in_dev) {
		err = -ENODEV;
		goto done;
	}
	err = -EADDRNOTAVAIL;

	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
		    pmc->multi.imr_ifindex == imr.imr_ifindex)
			break;
	}
	if (!pmc)		/* must have a prior join */
		goto done;
	msf->imsf_fmode = pmc->sfmode;
	psl = pmc->sflist;
2103
	rtnl_unlock();
L
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2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
	if (!psl) {
		len = 0;
		count = 0;
	} else {
		count = psl->sl_count;
	}
	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
	len = copycount * sizeof(psl->sl_addr[0]);
	msf->imsf_numsrc = count;
	if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
	    copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
		return -EFAULT;
	}
	if (len &&
	    copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
		return -EFAULT;
	return 0;
done:
2122
	rtnl_unlock();
L
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2123 2124 2125 2126 2127 2128 2129 2130
	return err;
}

int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
	struct group_filter __user *optval, int __user *optlen)
{
	int err, i, count, copycount;
	struct sockaddr_in *psin;
A
Al Viro 已提交
2131
	__be32 addr;
L
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2132 2133 2134 2135 2136 2137 2138 2139
	struct ip_mc_socklist *pmc;
	struct inet_sock *inet = inet_sk(sk);
	struct ip_sf_socklist *psl;

	psin = (struct sockaddr_in *)&gsf->gf_group;
	if (psin->sin_family != AF_INET)
		return -EINVAL;
	addr = psin->sin_addr.s_addr;
2140
	if (!ipv4_is_multicast(addr))
L
Linus Torvalds 已提交
2141 2142
		return -EINVAL;

2143
	rtnl_lock();
L
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2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155

	err = -EADDRNOTAVAIL;

	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
		if (pmc->multi.imr_multiaddr.s_addr == addr &&
		    pmc->multi.imr_ifindex == gsf->gf_interface)
			break;
	}
	if (!pmc)		/* must have a prior join */
		goto done;
	gsf->gf_fmode = pmc->sfmode;
	psl = pmc->sflist;
2156
	rtnl_unlock();
L
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	count = psl ? psl->sl_count : 0;
	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;
	}
	for (i=0; i<copycount; i++) {
		struct sockaddr_storage ss;

		psin = (struct sockaddr_in *)&ss;
		memset(&ss, 0, sizeof(ss));
		psin->sin_family = AF_INET;
		psin->sin_addr.s_addr = psl->sl_addr[i];
		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
			return -EFAULT;
	}
	return 0;
done:
2176
	rtnl_unlock();
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	return err;
}

/*
 * check if a multicast source filter allows delivery for a given <src,dst,intf>
 */
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int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
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{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *pmc;
	struct ip_sf_socklist *psl;
	int i;

2190
	if (!ipv4_is_multicast(loc_addr))
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		return 1;

	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
		if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
		    pmc->multi.imr_ifindex == dif)
			break;
	}
	if (!pmc)
		return 1;
	psl = pmc->sflist;
	if (!psl)
		return pmc->sfmode == MCAST_EXCLUDE;

	for (i=0; i<psl->sl_count; i++) {
		if (psl->sl_addr[i] == rmt_addr)
			break;
	}
	if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
		return 0;
	if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
		return 0;
	return 1;
}

/*
 *	A socket is closing.
 */

void ip_mc_drop_socket(struct sock *sk)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ip_mc_socklist *iml;
2223
	struct net *net = sock_net(sk);
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	if (inet->mc_list == NULL)
		return;

	rtnl_lock();
	while ((iml = inet->mc_list) != NULL) {
		struct in_device *in_dev;
		inet->mc_list = iml->next;

2233
		in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2234 2235
		(void) ip_mc_leave_src(sk, iml, in_dev);
		if (in_dev != NULL) {
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			ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
			in_dev_put(in_dev);
		}
		sock_kfree_s(sk, iml, sizeof(*iml));
	}
	rtnl_unlock();
}

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int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
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{
	struct ip_mc_list *im;
	struct ip_sf_list *psf;
	int rv = 0;

	read_lock(&in_dev->mc_list_lock);
	for (im=in_dev->mc_list; im; im=im->next) {
		if (im->multiaddr == mc_addr)
			break;
	}
	if (im && proto == IPPROTO_IGMP) {
		rv = 1;
	} else if (im) {
		if (src_addr) {
			for (psf=im->sources; psf; psf=psf->sf_next) {
				if (psf->sf_inaddr == src_addr)
					break;
			}
			if (psf)
				rv = psf->sf_count[MCAST_INCLUDE] ||
					psf->sf_count[MCAST_EXCLUDE] !=
					im->sfcount[MCAST_EXCLUDE];
			else
				rv = im->sfcount[MCAST_EXCLUDE] != 0;
		} else
			rv = 1; /* unspecified source; tentatively allow */
	}
	read_unlock(&in_dev->mc_list_lock);
	return rv;
}

#if defined(CONFIG_PROC_FS)
struct igmp_mc_iter_state {
2278
	struct seq_net_private p;
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	struct net_device *dev;
	struct in_device *in_dev;
};

#define	igmp_mc_seq_private(seq)	((struct igmp_mc_iter_state *)(seq)->private)

static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
{
2287
	struct net *net = seq_file_net(seq);
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	struct ip_mc_list *im = NULL;
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);

2291
	state->in_dev = NULL;
2292
	for_each_netdev(net, state->dev) {
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		struct in_device *in_dev;
		in_dev = in_dev_get(state->dev);
		if (!in_dev)
			continue;
		read_lock(&in_dev->mc_list_lock);
		im = in_dev->mc_list;
		if (im) {
			state->in_dev = in_dev;
			break;
		}
		read_unlock(&in_dev->mc_list_lock);
		in_dev_put(in_dev);
	}
	return im;
}

static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
{
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
	im = im->next;
	while (!im) {
		if (likely(state->in_dev != NULL)) {
			read_unlock(&state->in_dev->mc_list_lock);
			in_dev_put(state->in_dev);
		}
2318
		state->dev = next_net_device(state->dev);
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		if (!state->dev) {
			state->in_dev = NULL;
			break;
		}
		state->in_dev = in_dev_get(state->dev);
		if (!state->in_dev)
			continue;
		read_lock(&state->in_dev->mc_list_lock);
		im = state->in_dev->mc_list;
	}
	return im;
}

static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip_mc_list *im = igmp_mc_get_first(seq);
	if (im)
		while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
			--pos;
	return pos ? NULL : im;
}

static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
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	__acquires(dev_base_lock)
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{
	read_lock(&dev_base_lock);
	return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip_mc_list *im;
	if (v == SEQ_START_TOKEN)
		im = igmp_mc_get_first(seq);
	else
		im = igmp_mc_get_next(seq, v);
	++*pos;
	return im;
}

static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
S
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	__releases(dev_base_lock)
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{
	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
	if (likely(state->in_dev != NULL)) {
		read_unlock(&state->in_dev->mc_list_lock);
		in_dev_put(state->in_dev);
		state->in_dev = NULL;
	}
	state->dev = NULL;
	read_unlock(&dev_base_lock);
}

static int igmp_mc_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
2375
		seq_puts(seq,
L
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			 "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
	else {
		struct ip_mc_list *im = (struct ip_mc_list *)v;
		struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
		char   *querier;
#ifdef CONFIG_IP_MULTICAST
		querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
			  IGMP_V2_SEEN(state->in_dev) ? "V2" :
			  "V3";
#else
		querier = "NONE";
#endif

		if (state->in_dev->mc_list == im) {
			seq_printf(seq, "%d\t%-10s: %5d %7s\n",
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				   state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
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		}

		seq_printf(seq,
2395
			   "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
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			   im->multiaddr, im->users,
			   im->tm_running, im->tm_running ?
			   jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
			   im->reporter);
	}
	return 0;
}

2404
static const struct seq_operations igmp_mc_seq_ops = {
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	.start	=	igmp_mc_seq_start,
	.next	=	igmp_mc_seq_next,
	.stop	=	igmp_mc_seq_stop,
	.show	=	igmp_mc_seq_show,
};

static int igmp_mc_seq_open(struct inode *inode, struct file *file)
{
2413
	return seq_open_net(inode, file, &igmp_mc_seq_ops,
2414
			sizeof(struct igmp_mc_iter_state));
L
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}

2417
static const struct file_operations igmp_mc_seq_fops = {
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	.owner		=	THIS_MODULE,
	.open		=	igmp_mc_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2422
	.release	=	seq_release_net,
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};

struct igmp_mcf_iter_state {
2426
	struct seq_net_private p;
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	struct net_device *dev;
	struct in_device *idev;
	struct ip_mc_list *im;
};

#define igmp_mcf_seq_private(seq)	((struct igmp_mcf_iter_state *)(seq)->private)

static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
{
2436
	struct net *net = seq_file_net(seq);
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	struct ip_sf_list *psf = NULL;
	struct ip_mc_list *im = NULL;
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

2441 2442
	state->idev = NULL;
	state->im = NULL;
2443
	for_each_netdev(net, state->dev) {
L
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		struct in_device *idev;
		idev = in_dev_get(state->dev);
		if (unlikely(idev == NULL))
			continue;
		read_lock(&idev->mc_list_lock);
		im = idev->mc_list;
		if (likely(im != NULL)) {
			spin_lock_bh(&im->lock);
			psf = im->sources;
			if (likely(psf != NULL)) {
				state->im = im;
				state->idev = idev;
				break;
			}
			spin_unlock_bh(&im->lock);
		}
		read_unlock(&idev->mc_list_lock);
		in_dev_put(idev);
	}
	return psf;
}

static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
{
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

	psf = psf->sf_next;
	while (!psf) {
		spin_unlock_bh(&state->im->lock);
		state->im = state->im->next;
		while (!state->im) {
			if (likely(state->idev != NULL)) {
				read_unlock(&state->idev->mc_list_lock);
				in_dev_put(state->idev);
			}
2479
			state->dev = next_net_device(state->dev);
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			if (!state->dev) {
				state->idev = NULL;
				goto out;
			}
			state->idev = in_dev_get(state->dev);
			if (!state->idev)
				continue;
			read_lock(&state->idev->mc_list_lock);
			state->im = state->idev->mc_list;
		}
		if (!state->im)
			break;
		spin_lock_bh(&state->im->lock);
		psf = state->im->sources;
	}
out:
	return psf;
}

static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
{
	struct ip_sf_list *psf = igmp_mcf_get_first(seq);
	if (psf)
		while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
			--pos;
	return pos ? NULL : psf;
}

static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
{
	read_lock(&dev_base_lock);
	return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct ip_sf_list *psf;
	if (v == SEQ_START_TOKEN)
		psf = igmp_mcf_get_first(seq);
	else
		psf = igmp_mcf_get_next(seq, v);
	++*pos;
	return psf;
}

static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
{
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
	if (likely(state->im != NULL)) {
		spin_unlock_bh(&state->im->lock);
		state->im = NULL;
	}
	if (likely(state->idev != NULL)) {
		read_unlock(&state->idev->mc_list_lock);
		in_dev_put(state->idev);
		state->idev = NULL;
	}
	state->dev = NULL;
	read_unlock(&dev_base_lock);
}

static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
{
	struct ip_sf_list *psf = (struct ip_sf_list *)v;
	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);

	if (v == SEQ_START_TOKEN) {
2547
		seq_printf(seq,
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			   "%3s %6s "
			   "%10s %10s %6s %6s\n", "Idx",
			   "Device", "MCA",
			   "SRC", "INC", "EXC");
	} else {
		seq_printf(seq,
			   "%3d %6.6s 0x%08x "
2555 2556
			   "0x%08x %6lu %6lu\n",
			   state->dev->ifindex, state->dev->name,
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			   ntohl(state->im->multiaddr),
			   ntohl(psf->sf_inaddr),
			   psf->sf_count[MCAST_INCLUDE],
			   psf->sf_count[MCAST_EXCLUDE]);
	}
	return 0;
}

2565
static const struct seq_operations igmp_mcf_seq_ops = {
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	.start	=	igmp_mcf_seq_start,
	.next	=	igmp_mcf_seq_next,
	.stop	=	igmp_mcf_seq_stop,
	.show	=	igmp_mcf_seq_show,
};

static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
{
2574
	return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2575
			sizeof(struct igmp_mcf_iter_state));
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}

2578
static const struct file_operations igmp_mcf_seq_fops = {
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	.owner		=	THIS_MODULE,
	.open		=	igmp_mcf_seq_open,
	.read		=	seq_read,
	.llseek		=	seq_lseek,
2583
	.release	=	seq_release_net,
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};

2586
static int igmp_net_init(struct net *net)
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{
2588 2589 2590 2591 2592 2593 2594 2595
	struct proc_dir_entry *pde;

	pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
	if (!pde)
		goto out_igmp;
	pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
	if (!pde)
		goto out_mcfilter;
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	return 0;
2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617

out_mcfilter:
	proc_net_remove(net, "igmp");
out_igmp:
	return -ENOMEM;
}

static void igmp_net_exit(struct net *net)
{
	proc_net_remove(net, "mcfilter");
	proc_net_remove(net, "igmp");
}

static struct pernet_operations igmp_net_ops = {
	.init = igmp_net_init,
	.exit = igmp_net_exit,
};

int __init igmp_mc_proc_init(void)
{
	return register_pernet_subsys(&igmp_net_ops);
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}
#endif

EXPORT_SYMBOL(ip_mc_dec_group);
EXPORT_SYMBOL(ip_mc_inc_group);
EXPORT_SYMBOL(ip_mc_join_group);
2624
EXPORT_SYMBOL(ip_mc_rejoin_group);