Commit 10a72b76 authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by Greg Kroah-Hartman

net: ip6mr: fix static mfc/dev leaks on table destruction

[ Upstream commit 4c698046 ]

Similar to ipv4, when destroying an mrt table the static mfc entries and
the static devices are kept, which leads to devices that can never be
destroyed (because of refcnt taken) and leaked memory. Make sure that
everything is cleaned up on netns destruction.

Fixes: 8229efda ("netns: ip6mr: enable namespace support in ipv6 multicast forwarding code")
CC: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: default avatarCong Wang <cwang@twopensource.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 207c03d6
...@@ -120,7 +120,7 @@ static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc, ...@@ -120,7 +120,7 @@ static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
int cmd); int cmd);
static int ip6mr_rtm_dumproute(struct sk_buff *skb, static int ip6mr_rtm_dumproute(struct sk_buff *skb,
struct netlink_callback *cb); struct netlink_callback *cb);
static void mroute_clean_tables(struct mr6_table *mrt); static void mroute_clean_tables(struct mr6_table *mrt, bool all);
static void ipmr_expire_process(unsigned long arg); static void ipmr_expire_process(unsigned long arg);
#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
...@@ -337,7 +337,7 @@ static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) ...@@ -337,7 +337,7 @@ static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
static void ip6mr_free_table(struct mr6_table *mrt) static void ip6mr_free_table(struct mr6_table *mrt)
{ {
del_timer(&mrt->ipmr_expire_timer); del_timer(&mrt->ipmr_expire_timer);
mroute_clean_tables(mrt); mroute_clean_tables(mrt, true);
kfree(mrt); kfree(mrt);
} }
...@@ -1536,7 +1536,7 @@ static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, ...@@ -1536,7 +1536,7 @@ static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
* Close the multicast socket, and clear the vif tables etc * Close the multicast socket, and clear the vif tables etc
*/ */
static void mroute_clean_tables(struct mr6_table *mrt) static void mroute_clean_tables(struct mr6_table *mrt, bool all)
{ {
int i; int i;
LIST_HEAD(list); LIST_HEAD(list);
...@@ -1546,8 +1546,9 @@ static void mroute_clean_tables(struct mr6_table *mrt) ...@@ -1546,8 +1546,9 @@ static void mroute_clean_tables(struct mr6_table *mrt)
* Shut down all active vif entries * Shut down all active vif entries
*/ */
for (i = 0; i < mrt->maxvif; i++) { for (i = 0; i < mrt->maxvif; i++) {
if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) if (!all && (mrt->vif6_table[i].flags & VIFF_STATIC))
mif6_delete(mrt, i, &list); continue;
mif6_delete(mrt, i, &list);
} }
unregister_netdevice_many(&list); unregister_netdevice_many(&list);
...@@ -1556,7 +1557,7 @@ static void mroute_clean_tables(struct mr6_table *mrt) ...@@ -1556,7 +1557,7 @@ static void mroute_clean_tables(struct mr6_table *mrt)
*/ */
for (i = 0; i < MFC6_LINES; i++) { for (i = 0; i < MFC6_LINES; i++) {
list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
if (c->mfc_flags & MFC_STATIC) if (!all && (c->mfc_flags & MFC_STATIC))
continue; continue;
write_lock_bh(&mrt_lock); write_lock_bh(&mrt_lock);
list_del(&c->list); list_del(&c->list);
...@@ -1619,7 +1620,7 @@ int ip6mr_sk_done(struct sock *sk) ...@@ -1619,7 +1620,7 @@ int ip6mr_sk_done(struct sock *sk)
net->ipv6.devconf_all); net->ipv6.devconf_all);
write_unlock_bh(&mrt_lock); write_unlock_bh(&mrt_lock);
mroute_clean_tables(mrt); mroute_clean_tables(mrt, false);
err = 0; err = 0;
break; break;
} }
......
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