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mld: do not remove mld souce list info when set link down 

This is an IPv6 version of commit 24803f38a5 ("igmp: do not remove igmp
souce list..."). In mld_del_delrec(), we will restore back all source filter
info instead of flush them.

Move mld_clear_delrec() from ipv6_mc_down() to ipv6_mc_destroy_dev() since
we should not remove source list info when set link down. Remove
igmp6_group_dropped() in ipv6_mc_destroy_dev() since we have called it in
ipv6_mc_down().

Also clear all source info after igmp6_group_dropped() instead of in it
because ipv6_mc_down() will call igmp6_group_dropped().

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hangbin Liu 2017-01-12 21:19:37 +08:00 committed by David S. Miller
parent 3439352916
commit 1666d49e1d
1 changed files with 30 additions and 21 deletions
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51
net/ipv6/mcast.c
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@ -81,7 +81,7 @@ static void mld_gq_timer_expire(unsigned long data);
static void mld_ifc_timer_expire(unsigned long data);
static void mld_ifc_event(struct inet6_dev *idev);
static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
static void mld_clear_delrec(struct inet6_dev *idev);
static bool mld_in_v1_mode(const struct inet6_dev *idev);
static int sf_setstate(struct ifmcaddr6 *pmc);
@ -692,9 +692,9 @@ static void igmp6_group_dropped(struct ifmcaddr6 *mc)
dev_mc_del(dev, buf);
}
if (mc->mca_flags & MAF_NOREPORT)
goto done;
spin_unlock_bh(&mc->mca_lock);
if (mc->mca_flags & MAF_NOREPORT)
return;
if (!mc->idev->dead)
igmp6_leave_group(mc);
@ -702,8 +702,6 @@ static void igmp6_group_dropped(struct ifmcaddr6 *mc)
spin_lock_bh(&mc->mca_lock);
if (del_timer(&mc->mca_timer))
atomic_dec(&mc->mca_refcnt);
done:
ip6_mc_clear_src(mc);
spin_unlock_bh(&mc->mca_lock);
}
@ -748,10 +746,11 @@ static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
spin_unlock_bh(&idev->mc_lock);
}
static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
{
struct ifmcaddr6 *pmc, *pmc_prev;
struct ip6_sf_list *psf, *psf_next;
struct ip6_sf_list *psf;
struct in6_addr *pmca = &im->mca_addr;
spin_lock_bh(&idev->mc_lock);
pmc_prev = NULL;
@ -768,14 +767,20 @@ static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
}
spin_unlock_bh(&idev->mc_lock);
spin_lock_bh(&im->mca_lock);
if (pmc) {
for (psf = pmc->mca_tomb; psf; psf = psf_next) {
psf_next = psf->sf_next;
kfree(psf);
im->idev = pmc->idev;
im->mca_crcount = idev->mc_qrv;
im->mca_sfmode = pmc->mca_sfmode;
if (pmc->mca_sfmode == MCAST_INCLUDE) {
im->mca_tomb = pmc->mca_tomb;
im->mca_sources = pmc->mca_sources;
for (psf = im->mca_sources; psf; psf = psf->sf_next)
psf->sf_crcount = im->mca_crcount;
}
in6_dev_put(pmc->idev);
kfree(pmc);
}
spin_unlock_bh(&im->mca_lock);
}
static void mld_clear_delrec(struct inet6_dev *idev)
@ -904,7 +909,7 @@ int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
mca_get(mc);
write_unlock_bh(&idev->lock);
mld_del_delrec(idev, &mc->mca_addr);
mld_del_delrec(idev, mc);
igmp6_group_added(mc);
ma_put(mc);
return 0;
@ -927,6 +932,7 @@ int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
write_unlock_bh(&idev->lock);
igmp6_group_dropped(ma);
ip6_mc_clear_src(ma);
ma_put(ma);
return 0;
@ -2501,15 +2507,17 @@ void ipv6_mc_down(struct inet6_dev *idev)
/* Withdraw multicast list */
read_lock_bh(&idev->lock);
mld_ifc_stop_timer(idev);
mld_gq_stop_timer(idev);
mld_dad_stop_timer(idev);
for (i = idev->mc_list; i; i = i->next)
igmp6_group_dropped(i);
read_unlock_bh(&idev->lock);
mld_clear_delrec(idev);
/* Should stop timer after group drop. or we will
* start timer again in mld_ifc_event()
*/
mld_ifc_stop_timer(idev);
mld_gq_stop_timer(idev);
mld_dad_stop_timer(idev);
read_unlock_bh(&idev->lock);
}
static void ipv6_mc_reset(struct inet6_dev *idev)
@ -2531,8 +2539,10 @@ void ipv6_mc_up(struct inet6_dev *idev)
read_lock_bh(&idev->lock);
ipv6_mc_reset(idev);
for (i = idev->mc_list; i; i = i->next)
for (i = idev->mc_list; i; i = i->next) {
mld_del_delrec(idev, i);
igmp6_group_added(i);
}
read_unlock_bh(&idev->lock);
}
@ -2565,6 +2575,7 @@ void ipv6_mc_destroy_dev(struct inet6_dev *idev)
/* Deactivate timers */
ipv6_mc_down(idev);
mld_clear_delrec(idev);
/* Delete all-nodes address. */
/* We cannot call ipv6_dev_mc_dec() directly, our caller in
@ -2579,11 +2590,9 @@ void ipv6_mc_destroy_dev(struct inet6_dev *idev)
write_lock_bh(&idev->lock);
while ((i = idev->mc_list) != NULL) {
idev->mc_list = i->next;
write_unlock_bh(&idev->lock);
igmp6_group_dropped(i);
ma_put(i);
write_lock_bh(&idev->lock);
}
write_unlock_bh(&idev->lock);