From 7c906c367c7dacf6f641e70910f11acd7195e8e9 Mon Sep 17 00:00:00 2001 From: Hangbin Liu Date: Thu, 12 Jan 2017 21:19:37 +0800 Subject: [PATCH] mld: do not remove mld souce list info when set link down commit 1666d49e1d416fcc2cce708242a52fe3317ea8ba upstream. This is an IPv6 version of commit 24803f38a5c0 ("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 Signed-off-by: David S. Miller [bwh: Backported to 3.2: - Timer code moved around in ipv6_mc_down() is different - Adjust context] Signed-off-by: Ben Hutchings --- net/ipv6/mcast.c | 51 ++++++++++++++++++++++++++++-------------------- 1 file changed, 30 insertions(+), 21 deletions(-) diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index be5466e3b54f..d21d4245305c 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -92,7 +92,7 @@ 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 int sf_setstate(struct ifmcaddr6 *pmc); static void sf_markstate(struct ifmcaddr6 *pmc); @@ -691,9 +691,9 @@ 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); @@ -701,8 +701,6 @@ 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); } @@ -747,10 +745,11 @@ 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; @@ -767,14 +766,20 @@ 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) @@ -877,7 +882,7 @@ int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) idev->mc_list = 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; @@ -898,6 +903,7 @@ 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; @@ -2231,18 +2237,20 @@ void ipv6_mc_down(struct inet6_dev *idev) /* Withdraw multicast list */ read_lock_bh(&idev->lock); + + for (i = idev->mc_list; i; i=i->next) + igmp6_group_dropped(i); + + /* Should stop timer after group drop. or we will + * start timer again in mld_ifc_event() + */ idev->mc_ifc_count = 0; if (del_timer(&idev->mc_ifc_timer)) __in6_dev_put(idev); idev->mc_gq_running = 0; if (del_timer(&idev->mc_gq_timer)) __in6_dev_put(idev); - - for (i = idev->mc_list; i; i=i->next) - igmp6_group_dropped(i); read_unlock_bh(&idev->lock); - - mld_clear_delrec(idev); } @@ -2255,8 +2263,10 @@ void ipv6_mc_up(struct inet6_dev *idev) /* Install multicast list, except for all-nodes (already installed) */ read_lock_bh(&idev->lock); - 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); } @@ -2289,6 +2299,7 @@ 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 @@ -2303,11 +2314,9 @@ 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); + write_unlock_bh(&idev->lock); ma_put(i); - write_lock_bh(&idev->lock); } write_unlock_bh(&idev->lock); -- 2.39.2