eddc9ec53b
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2623 lines
62 KiB
C
2623 lines
62 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
|
|
*
|
|
* Authors:
|
|
* Alan Cox <Alan.Cox@linux.org>
|
|
*
|
|
* 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
|
|
* The enhancements are mainly based on Steve Deering's
|
|
* 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
|
|
* memberships but was being deleted,
|
|
* which caused a "del_timer() called
|
|
* from %p with timer not initialized\n"
|
|
* message (960131).
|
|
* Christian Daudt : removed del_timer from
|
|
* 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>
|
|
|
|
#include <net/arp.h>
|
|
#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.
|
|
*/
|
|
|
|
#define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
|
|
(in_dev)->cnf.force_igmp_version == 1 || \
|
|
((in_dev)->mr_v1_seen && \
|
|
time_before(jiffies, (in_dev)->mr_v1_seen)))
|
|
#define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
|
|
(in_dev)->cnf.force_igmp_version == 2 || \
|
|
((in_dev)->mr_v2_seen && \
|
|
time_before(jiffies, (in_dev)->mr_v2_seen)))
|
|
|
|
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
|
|
static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
|
|
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);
|
|
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
|
|
int sfcount, __be32 *psfsrc, int delta);
|
|
|
|
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);
|
|
im->tm_running=0;
|
|
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)
|
|
{
|
|
int tv=net_random() % max_delay;
|
|
|
|
im->tm_running=1;
|
|
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);
|
|
im->tm_running=1;
|
|
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;
|
|
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;
|
|
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;
|
|
|
|
skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return NULL;
|
|
|
|
{
|
|
struct flowi fl = { .oif = dev->ifindex,
|
|
.nl_u = { .ip4_u = {
|
|
.daddr = IGMPV3_ALL_MCR } },
|
|
.proto = IPPROTO_IGMP };
|
|
if (ip_route_output_key(&rt, &fl)) {
|
|
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));
|
|
|
|
skb_reset_network_header(skb);
|
|
pip = ip_hdr(skb);
|
|
skb_put(skb, sizeof(struct iphdr) + 4);
|
|
|
|
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;
|
|
|
|
pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig));
|
|
skb->h.igmph = (struct igmphdr *)pig;
|
|
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)
|
|
{
|
|
struct iphdr *pip = ip_hdr(skb);
|
|
struct igmphdr *pig = skb->h.igmph;
|
|
const int iplen = skb->tail - skb->nh.raw;
|
|
const int igmplen = skb->tail - skb->h.raw;
|
|
|
|
pip->tot_len = htons(iplen);
|
|
ip_send_check(pip);
|
|
pig->csum = ip_compute_csum(skb->h.igmph, igmplen);
|
|
|
|
return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
|
|
dst_output);
|
|
}
|
|
|
|
static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
|
|
{
|
|
return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
|
|
}
|
|
|
|
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;
|
|
pih = (struct igmpv3_report *)skb->h.igmph;
|
|
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;
|
|
int scount, stotal, first, isquery, truncate;
|
|
|
|
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;
|
|
|
|
stotal = scount = 0;
|
|
|
|
psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
|
|
|
|
if (!*psf_list)
|
|
goto empty_source;
|
|
|
|
pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL;
|
|
|
|
/* 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) {
|
|
__be32 *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(__be32) +
|
|
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;
|
|
}
|
|
if (!skb)
|
|
return NULL;
|
|
psrc = (__be32 *)skb_put(skb, sizeof(__be32));
|
|
*psrc = psf->sf_inaddr;
|
|
scount++; stotal++;
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
pmc->crcount--;
|
|
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);
|
|
pmc->crcount--;
|
|
}
|
|
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;
|
|
__be32 group = pmc ? pmc->multiaddr : 0;
|
|
__be32 dst;
|
|
|
|
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 };
|
|
if (ip_route_output_key(&rt, &fl))
|
|
return -1;
|
|
}
|
|
if (rt->rt_src == 0) {
|
|
ip_rt_put(rt);
|
|
return -1;
|
|
}
|
|
|
|
skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
|
|
if (skb == NULL) {
|
|
ip_rt_put(rt);
|
|
return -1;
|
|
}
|
|
|
|
skb->dst = &rt->u.dst;
|
|
|
|
skb_reserve(skb, LL_RESERVED_SPACE(dev));
|
|
|
|
skb_reset_network_header(skb);
|
|
iph = ip_hdr(skb);
|
|
skb_put(skb, sizeof(struct iphdr) + 4);
|
|
|
|
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;
|
|
iph->tot_len = htons(IGMP_SIZE);
|
|
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;
|
|
ip_send_check(iph);
|
|
|
|
ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
|
|
ih->type=type;
|
|
ih->code=0;
|
|
ih->csum=0;
|
|
ih->group=group;
|
|
ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
|
|
|
|
return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
|
|
dst_output);
|
|
}
|
|
|
|
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;
|
|
in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
|
|
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);
|
|
im->tm_running=0;
|
|
|
|
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);
|
|
}
|
|
|
|
/* mark EXCLUDE-mode sources */
|
|
static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
int i, scount;
|
|
|
|
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;
|
|
}
|
|
|
|
static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
|
|
{
|
|
struct ip_sf_list *psf;
|
|
int i, scount;
|
|
|
|
if (pmc->sfmode == MCAST_EXCLUDE)
|
|
return igmp_xmarksources(pmc, nsrcs, srcs);
|
|
|
|
/* mark INCLUDE-mode sources */
|
|
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;
|
|
}
|
|
}
|
|
if (!scount) {
|
|
pmc->gsquery = 0;
|
|
return 0;
|
|
}
|
|
pmc->gsquery = 1;
|
|
return 1;
|
|
}
|
|
|
|
static void igmp_heard_report(struct in_device *in_dev, __be32 group)
|
|
{
|
|
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)
|
|
{
|
|
struct igmphdr *ih = skb->h.igmph;
|
|
struct igmpv3_query *ih3 = (struct igmpv3_query *)ih;
|
|
struct ip_mc_list *im;
|
|
__be32 group = ih->group;
|
|
int max_delay;
|
|
int mark = 0;
|
|
|
|
|
|
if (len == 8) {
|
|
if (ih->code == 0) {
|
|
/* Alas, old v1 router presents here. */
|
|
|
|
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;
|
|
|
|
ih3 = (struct igmpv3_query *) skb->h.raw;
|
|
if (ih3->nsrcs) {
|
|
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
|
|
+ ntohs(ih3->nsrcs)*sizeof(__be32)))
|
|
return;
|
|
ih3 = (struct igmpv3_query *) skb->h.raw;
|
|
}
|
|
|
|
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) {
|
|
int changed;
|
|
|
|
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;
|
|
changed = !im->gsquery ||
|
|
igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
|
|
spin_unlock_bh(&im->lock);
|
|
if (changed)
|
|
igmp_mod_timer(im, max_delay);
|
|
}
|
|
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;
|
|
|
|
if (in_dev==NULL) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
|
|
goto drop;
|
|
|
|
switch (skb->ip_summed) {
|
|
case CHECKSUM_COMPLETE:
|
|
if (!csum_fold(skb->csum))
|
|
break;
|
|
/* fall through */
|
|
case CHECKSUM_NONE:
|
|
skb->csum = 0;
|
|
if (__skb_checksum_complete(skb))
|
|
goto drop;
|
|
}
|
|
|
|
ih = skb->h.igmph;
|
|
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? */
|
|
if (((struct rtable*)skb->dst)->fl.iif == 0)
|
|
break;
|
|
/* 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);
|
|
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:
|
|
break;
|
|
}
|
|
|
|
drop:
|
|
in_dev_put(in_dev);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Add a filter to a device
|
|
*/
|
|
|
|
static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
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)
|
|
dev_mc_add(dev,buf,dev->addr_len,0);
|
|
}
|
|
|
|
/*
|
|
* Remove a filter from a device
|
|
*/
|
|
|
|
static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
char buf[MAX_ADDR_LEN];
|
|
struct net_device *dev = in_dev->dev;
|
|
|
|
if (arp_mc_map(addr, buf, dev, 0) == 0)
|
|
dev_mc_delete(dev,buf,dev->addr_len,0);
|
|
}
|
|
|
|
#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.
|
|
*/
|
|
pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
|
|
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);
|
|
}
|
|
|
|
static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
|
|
{
|
|
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.
|
|
*/
|
|
|
|
void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|
|
im = kmalloc(sizeof(*im), GFP_KERNEL);
|
|
if (!im)
|
|
goto out;
|
|
|
|
im->users=1;
|
|
im->interface=in_dev;
|
|
in_dev_hold(in_dev);
|
|
im->multiaddr=addr;
|
|
/* 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
|
|
im->tm_running=0;
|
|
init_timer(&im->timer);
|
|
im->timer.data=(unsigned long)im;
|
|
im->timer.function=&igmp_timer_expire;
|
|
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);
|
|
im->next=in_dev->mc_list;
|
|
in_dev->mc_list=im;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Resend IGMP JOIN report; used for bonding.
|
|
*/
|
|
void ip_mc_rejoin_group(struct ip_mc_list *im)
|
|
{
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
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
|
|
}
|
|
|
|
/*
|
|
* A socket has left a multicast group on device dev
|
|
*/
|
|
|
|
void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
|
|
{
|
|
struct ip_mc_list *i, **ip;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
|
|
if (i->multiaddr==addr) {
|
|
if (--i->users == 0) {
|
|
write_lock_bh(&in_dev->mc_list_lock);
|
|
*ip = i->next;
|
|
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;
|
|
init_timer(&in_dev->mr_gq_timer);
|
|
in_dev->mr_gq_timer.data=(unsigned long) in_dev;
|
|
in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
|
|
in_dev->mr_ifc_count = 0;
|
|
init_timer(&in_dev->mr_ifc_timer);
|
|
in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
|
|
in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
|
|
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;
|
|
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);
|
|
}
|
|
|
|
static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
|
|
{
|
|
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) {
|
|
idev = inetdev_by_index(imr->imr_ifindex);
|
|
if (idev)
|
|
__in_dev_put(idev);
|
|
return idev;
|
|
}
|
|
if (imr->imr_address.s_addr) {
|
|
dev = ip_dev_find(imr->imr_address.s_addr);
|
|
if (!dev)
|
|
return NULL;
|
|
dev_put(dev);
|
|
}
|
|
|
|
if (!dev && !ip_route_output_key(&rt, &fl)) {
|
|
dev = rt->u.dst.dev;
|
|
ip_rt_put(rt);
|
|
}
|
|
if (dev) {
|
|
imr->imr_ifindex = dev->ifindex;
|
|
idev = __in_dev_get_rtnl(dev);
|
|
}
|
|
return idev;
|
|
}
|
|
|
|
/*
|
|
* Join a socket to a group
|
|
*/
|
|
int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
|
|
int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
|
|
|
|
|
|
static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
|
|
__be32 *psfsrc)
|
|
{
|
|
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)) {
|
|
psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
|
|
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
|
|
|
|
static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
|
|
int sfcount, __be32 *psfsrc, int delta)
|
|
{
|
|
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
|
|
pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
|
|
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,
|
|
__be32 *psfsrc, int delta)
|
|
{
|
|
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) {
|
|
psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
|
|
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)
|
|
{
|
|
struct ip_sf_list *psf, *dpsf;
|
|
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;
|
|
if (new_in) {
|
|
if (!psf->sf_oldin) {
|
|
struct ip_sf_list *prev = NULL;
|
|
|
|
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;
|
|
rv++;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Add multicast source filter list to the interface list
|
|
*/
|
|
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
|
|
int sfcount, __be32 *psfsrc, int delta)
|
|
{
|
|
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 in_device *in_dev = pmc->interface;
|
|
struct ip_sf_list *psf;
|
|
#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 */
|
|
|
|
pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
|
|
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;
|
|
pmc->sfcount[MCAST_INCLUDE] = 0;
|
|
pmc->sfcount[MCAST_EXCLUDE] = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Join a multicast group
|
|
*/
|
|
int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
|
|
{
|
|
int err;
|
|
__be32 addr = imr->imr_multiaddr.s_addr;
|
|
struct ip_mc_socklist *iml=NULL, *i;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
int ifindex;
|
|
int count = 0;
|
|
|
|
if (!MULTICAST(addr))
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
|
|
in_dev = ip_mc_find_dev(imr);
|
|
|
|
if (!in_dev) {
|
|
iml = NULL;
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
err = -EADDRINUSE;
|
|
ifindex = imr->imr_ifindex;
|
|
for (i = inet->mc_list; i; i = i->next) {
|
|
if (i->multi.imr_multiaddr.s_addr == addr &&
|
|
i->multi.imr_ifindex == ifindex)
|
|
goto done;
|
|
count++;
|
|
}
|
|
err = -ENOBUFS;
|
|
if (count >= sysctl_igmp_max_memberships)
|
|
goto done;
|
|
iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
|
|
if (iml == NULL)
|
|
goto done;
|
|
|
|
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:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
|
|
struct in_device *in_dev)
|
|
{
|
|
int err;
|
|
|
|
if (iml->sflist == 0) {
|
|
/* 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;
|
|
struct in_device *in_dev;
|
|
__be32 group = imr->imr_multiaddr.s_addr;
|
|
u32 ifindex;
|
|
int ret = -EADDRNOTAVAIL;
|
|
|
|
rtnl_lock();
|
|
in_dev = ip_mc_find_dev(imr);
|
|
ifindex = imr->imr_ifindex;
|
|
for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
|
|
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;
|
|
|
|
(void) ip_mc_leave_src(sk, iml, in_dev);
|
|
|
|
*imlp = iml->next;
|
|
|
|
if (in_dev)
|
|
ip_mc_dec_group(in_dev, group);
|
|
rtnl_unlock();
|
|
sock_kfree_s(sk, iml, sizeof(*iml));
|
|
return 0;
|
|
}
|
|
if (!in_dev)
|
|
ret = -ENODEV;
|
|
rtnl_unlock();
|
|
return ret;
|
|
}
|
|
|
|
int ip_mc_source(int add, int omode, struct sock *sk, struct
|
|
ip_mreq_source *mreqs, int ifindex)
|
|
{
|
|
int err;
|
|
struct ip_mreqn imr;
|
|
__be32 addr = mreqs->imr_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev = NULL;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *psl;
|
|
int leavegroup = 0;
|
|
int i, j, rv;
|
|
|
|
if (!MULTICAST(addr))
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
|
|
imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
|
|
imr.imr_address.s_addr = mreqs->imr_interface;
|
|
imr.imr_ifindex = ifindex;
|
|
in_dev = ip_mc_find_dev(&imr);
|
|
|
|
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 == imr.imr_multiaddr.s_addr
|
|
&& pmc->multi.imr_ifindex == imr.imr_ifindex)
|
|
break;
|
|
}
|
|
if (!pmc) { /* must have a prior join */
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
/* if a source filter was set, must be the same mode as before */
|
|
if (pmc->sflist) {
|
|
if (pmc->sfmode != omode) {
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
} 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);
|
|
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
|
|
NULL, 0);
|
|
pmc->sfmode = omode;
|
|
}
|
|
|
|
psl = pmc->sflist;
|
|
if (!add) {
|
|
if (!psl)
|
|
goto done; /* err = -EADDRNOTAVAIL */
|
|
rv = !0;
|
|
for (i=0; i<psl->sl_count; i++) {
|
|
rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
|
|
sizeof(__be32));
|
|
if (rv == 0)
|
|
break;
|
|
}
|
|
if (rv) /* source not found */
|
|
goto done; /* err = -EADDRNOTAVAIL */
|
|
|
|
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
|
|
if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
|
|
leavegroup = 1;
|
|
goto done;
|
|
}
|
|
|
|
/* update the interface filter */
|
|
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
|
|
&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;
|
|
newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
|
|
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,
|
|
sizeof(__be32));
|
|
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 */
|
|
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
|
|
&mreqs->imr_sourceaddr, 1);
|
|
done:
|
|
rtnl_unlock();
|
|
if (leavegroup)
|
|
return ip_mc_leave_group(sk, &imr);
|
|
return err;
|
|
}
|
|
|
|
int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
|
|
{
|
|
int err = 0;
|
|
struct ip_mreqn imr;
|
|
__be32 addr = msf->imsf_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *newpsl, *psl;
|
|
int leavegroup = 0;
|
|
|
|
if (!MULTICAST(addr))
|
|
return -EINVAL;
|
|
if (msf->imsf_fmode != MCAST_INCLUDE &&
|
|
msf->imsf_fmode != MCAST_EXCLUDE)
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
|
|
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
|
|
imr.imr_address.s_addr = msf->imsf_interface;
|
|
imr.imr_ifindex = ifindex;
|
|
in_dev = ip_mc_find_dev(&imr);
|
|
|
|
if (!in_dev) {
|
|
err = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
|
|
if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
|
|
leavegroup = 1;
|
|
goto done;
|
|
}
|
|
|
|
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 */
|
|
err = -EINVAL;
|
|
goto done;
|
|
}
|
|
if (msf->imsf_numsrc) {
|
|
newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
|
|
GFP_KERNEL);
|
|
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;
|
|
}
|
|
} else {
|
|
newpsl = NULL;
|
|
(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
|
|
msf->imsf_fmode, 0, NULL, 0);
|
|
}
|
|
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;
|
|
err = 0;
|
|
done:
|
|
rtnl_unlock();
|
|
if (leavegroup)
|
|
err = ip_mc_leave_group(sk, &imr);
|
|
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;
|
|
__be32 addr = msf->imsf_multiaddr;
|
|
struct ip_mc_socklist *pmc;
|
|
struct in_device *in_dev;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_sf_socklist *psl;
|
|
|
|
if (!MULTICAST(addr))
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
|
|
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
|
|
imr.imr_address.s_addr = msf->imsf_interface;
|
|
imr.imr_ifindex = 0;
|
|
in_dev = ip_mc_find_dev(&imr);
|
|
|
|
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;
|
|
rtnl_unlock();
|
|
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:
|
|
rtnl_unlock();
|
|
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;
|
|
__be32 addr;
|
|
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;
|
|
if (!MULTICAST(addr))
|
|
return -EINVAL;
|
|
|
|
rtnl_lock();
|
|
|
|
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;
|
|
rtnl_unlock();
|
|
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_in *psin;
|
|
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:
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* check if a multicast source filter allows delivery for a given <src,dst,intf>
|
|
*/
|
|
int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ip_mc_socklist *pmc;
|
|
struct ip_sf_socklist *psl;
|
|
int i;
|
|
|
|
if (!MULTICAST(loc_addr))
|
|
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;
|
|
|
|
if (inet->mc_list == NULL)
|
|
return;
|
|
|
|
rtnl_lock();
|
|
while ((iml = inet->mc_list) != NULL) {
|
|
struct in_device *in_dev;
|
|
inet->mc_list = iml->next;
|
|
|
|
in_dev = inetdev_by_index(iml->multi.imr_ifindex);
|
|
(void) ip_mc_leave_src(sk, iml, in_dev);
|
|
if (in_dev != NULL) {
|
|
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();
|
|
}
|
|
|
|
int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
|
|
{
|
|
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 {
|
|
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)
|
|
{
|
|
struct ip_mc_list *im = NULL;
|
|
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
|
|
|
|
for (state->dev = dev_base, state->in_dev = NULL;
|
|
state->dev;
|
|
state->dev = state->dev->next) {
|
|
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);
|
|
}
|
|
state->dev = state->dev->next;
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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)
|
|
seq_puts(seq,
|
|
"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",
|
|
state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
|
|
}
|
|
|
|
seq_printf(seq,
|
|
"\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
|
|
im->multiaddr, im->users,
|
|
im->tm_running, im->tm_running ?
|
|
jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
|
|
im->reporter);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations igmp_mc_seq_ops = {
|
|
.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)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
goto out;
|
|
rc = seq_open(file, &igmp_mc_seq_ops);
|
|
if (rc)
|
|
goto out_kfree;
|
|
|
|
seq = file->private_data;
|
|
seq->private = s;
|
|
out:
|
|
return rc;
|
|
out_kfree:
|
|
kfree(s);
|
|
goto out;
|
|
}
|
|
|
|
static const struct file_operations igmp_mc_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = igmp_mc_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
struct igmp_mcf_iter_state {
|
|
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)
|
|
{
|
|
struct ip_sf_list *psf = NULL;
|
|
struct ip_mc_list *im = NULL;
|
|
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
|
|
|
|
for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
|
|
state->dev;
|
|
state->dev = state->dev->next) {
|
|
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);
|
|
}
|
|
state->dev = state->dev->next;
|
|
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) {
|
|
seq_printf(seq,
|
|
"%3s %6s "
|
|
"%10s %10s %6s %6s\n", "Idx",
|
|
"Device", "MCA",
|
|
"SRC", "INC", "EXC");
|
|
} else {
|
|
seq_printf(seq,
|
|
"%3d %6.6s 0x%08x "
|
|
"0x%08x %6lu %6lu\n",
|
|
state->dev->ifindex, state->dev->name,
|
|
ntohl(state->im->multiaddr),
|
|
ntohl(psf->sf_inaddr),
|
|
psf->sf_count[MCAST_INCLUDE],
|
|
psf->sf_count[MCAST_EXCLUDE]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations igmp_mcf_seq_ops = {
|
|
.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)
|
|
{
|
|
struct seq_file *seq;
|
|
int rc = -ENOMEM;
|
|
struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
|
|
|
|
if (!s)
|
|
goto out;
|
|
rc = seq_open(file, &igmp_mcf_seq_ops);
|
|
if (rc)
|
|
goto out_kfree;
|
|
|
|
seq = file->private_data;
|
|
seq->private = s;
|
|
out:
|
|
return rc;
|
|
out_kfree:
|
|
kfree(s);
|
|
goto out;
|
|
}
|
|
|
|
static const struct file_operations igmp_mcf_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = igmp_mcf_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_private,
|
|
};
|
|
|
|
int __init igmp_mc_proc_init(void)
|
|
{
|
|
proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
|
|
proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(ip_mc_dec_group);
|
|
EXPORT_SYMBOL(ip_mc_inc_group);
|
|
EXPORT_SYMBOL(ip_mc_join_group);
|
|
EXPORT_SYMBOL(ip_mc_rejoin_group);
|