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Subject[PATCH] ipmr: ip6mr: Create new sockopt to clear mfc cache only
Date
Currently the only way to clear the mfc cache was to delete the entries
one by one using the MRT_DEL_MFC socket option or to destroy and
recreate the socket.

Create a new socket option which will clear the multicast forwarding
cache on the socket without destroying the socket.

Signed-off-by: Callum Sinclair <callum.sinclair@alliedtelesis.co.nz>
---
include/uapi/linux/mroute.h | 3 ++-
include/uapi/linux/mroute6.h | 3 ++-
net/ipv4/ipmr.c | 40 +++++++++++++++++++++----------
net/ipv6/ip6mr.c | 46 +++++++++++++++++++++++-------------
4 files changed, 61 insertions(+), 31 deletions(-)

diff --git a/include/uapi/linux/mroute.h b/include/uapi/linux/mroute.h
index 5d37a9ccce63..8a0beb885cd9 100644
--- a/include/uapi/linux/mroute.h
+++ b/include/uapi/linux/mroute.h
@@ -28,7 +28,8 @@
#define MRT_TABLE (MRT_BASE+9) /* Specify mroute table ID */
#define MRT_ADD_MFC_PROXY (MRT_BASE+10) /* Add a (*,*|G) mfc entry */
#define MRT_DEL_MFC_PROXY (MRT_BASE+11) /* Del a (*,*|G) mfc entry */
-#define MRT_MAX (MRT_BASE+11)
+#define MRT_DEL_MFC_ALL (MRT_BASE+12) /* Del all multicast entries */
+#define MRT_MAX (MRT_BASE+12)

#define SIOCGETVIFCNT SIOCPROTOPRIVATE /* IP protocol privates */
#define SIOCGETSGCNT (SIOCPROTOPRIVATE+1)
diff --git a/include/uapi/linux/mroute6.h b/include/uapi/linux/mroute6.h
index 9999cc006390..7def70cdf571 100644
--- a/include/uapi/linux/mroute6.h
+++ b/include/uapi/linux/mroute6.h
@@ -31,7 +31,8 @@
#define MRT6_TABLE (MRT6_BASE+9) /* Specify mroute table ID */
#define MRT6_ADD_MFC_PROXY (MRT6_BASE+10) /* Add a (*,*|G) mfc entry */
#define MRT6_DEL_MFC_PROXY (MRT6_BASE+11) /* Del a (*,*|G) mfc entry */
-#define MRT6_MAX (MRT6_BASE+11)
+#define MRT6_DEL_MFC_ALL (MRT6_BASE+12) /* Del all multicast entries */
+#define MRT6_MAX (MRT6_BASE+12)

#define SIOCGETMIFCNT_IN6 SIOCPROTOPRIVATE /* IP protocol privates */
#define SIOCGETSGCNT_IN6 (SIOCPROTOPRIVATE+1)
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index ddbf8c9a1abb..b996d0f70e5c 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1298,22 +1298,12 @@ static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
return 0;
}

-/* Close the multicast socket, and clear the vif tables etc */
-static void mroute_clean_tables(struct mr_table *mrt, bool all)
+/* Clear the vif tables */
+static void mroute_clean_cache(struct mr_table *mrt, bool all)
{
- struct net *net = read_pnet(&mrt->net);
struct mr_mfc *c, *tmp;
struct mfc_cache *cache;
- LIST_HEAD(list);
- int i;
-
- /* Shut down all active vif entries */
- for (i = 0; i < mrt->maxvif; i++) {
- if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
- continue;
- vif_delete(mrt, i, 0, &list);
- }
- unregister_netdevice_many(&list);
+ struct net *net = read_pnet(&mrt->net);

/* Wipe the cache */
list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
@@ -1340,6 +1330,23 @@ static void mroute_clean_tables(struct mr_table *mrt, bool all)
}
}

+/* Close the multicast socket, and clear the vif tables etc */
+static void mroute_clean_tables(struct mr_table *mrt, bool all)
+{
+ LIST_HEAD(list);
+ int i;
+
+ /* Shut down all active vif entries */
+ for (i = 0; i < mrt->maxvif; i++) {
+ if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
+ continue;
+ vif_delete(mrt, i, 0, &list);
+ }
+ unregister_netdevice_many(&list);
+
+ mroute_clean_cache(mrt, all);
+}
+
/* called from ip_ra_control(), before an RCU grace period,
* we dont need to call synchronize_rcu() here
*/
@@ -1482,6 +1489,13 @@ int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval,
sk == rtnl_dereference(mrt->mroute_sk),
parent);
break;
+ case MRT_DEL_MFC_ALL:
+ rtnl_lock();
+ ipmr_for_each_table(mrt, net) {
+ mroute_clean_cache(mrt, true);
+ }
+ rtnl_unlock();
+ break;
/* Control PIM assert. */
case MRT_ASSERT:
if (optlen != sizeof(val)) {
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 30337b38274b..0168420d217b 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1492,25 +1492,11 @@ static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt,
return 0;
}

-/*
- * Close the multicast socket, and clear the vif tables etc
- */
-
-static void mroute_clean_tables(struct mr_table *mrt, bool all)
+/* Clear the vif tables */
+static void mroute_clean_cache(struct mr_table *mrt, bool all)
{
struct mr_mfc *c, *tmp;
- LIST_HEAD(list);
- int i;
-
- /* Shut down all active vif entries */
- for (i = 0; i < mrt->maxvif; i++) {
- if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
- continue;
- mif6_delete(mrt, i, 0, &list);
- }
- unregister_netdevice_many(&list);

- /* Wipe the cache */
list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) {
if (!all && (c->mfc_flags & MFC_STATIC))
continue;
@@ -1536,6 +1522,27 @@ static void mroute_clean_tables(struct mr_table *mrt, bool all)
}
}

+/*
+ * Close the multicast socket, and clear the vif tables etc
+ */
+
+static void mroute_clean_tables(struct mr_table *mrt, bool all)
+{
+ LIST_HEAD(list);
+ int i;
+
+ /* Shut down all active vif entries */
+ for (i = 0; i < mrt->maxvif; i++) {
+ if (!all && (mrt->vif_table[i].flags & VIFF_STATIC))
+ continue;
+ mif6_delete(mrt, i, 0, &list);
+ }
+ unregister_netdevice_many(&list);
+
+ /* Wipe the cache */
+ mroute_clean_cache(mrt, all);
+}
+
static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk)
{
int err = 0;
@@ -1703,6 +1710,13 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
parent);
rtnl_unlock();
return ret;
+ case MRT6_DEL_MFC_ALL:
+ rtnl_lock();
+ ip6mr_for_each_table(mrt, net) {
+ mroute_clean_cache(mrt, true);
+ }
+ rtnl_unlock();
+ return 0;

/*
* Control PIM assert (to activate pim will activate assert)
--
2.20.1
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