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ipmr: ip6mr: Create new sockopt to clear mfc cache or vifs

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Currently the only way to clear the forwarding 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 with the use of optional flags can
clear any combination of multicast entries (static or not static) and
multicast vifs (static or not static).

Calling the new socket option MRT_FLUSH with the flags MRT_FLUSH_MFC and
MRT_FLUSH_VIFS will clear all entries and vifs on the socket except for
static entries.

Signed-off-by: Callum Sinclair <callum.sinclair@alliedtelesis.co.nz>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Callum Sinclair
2019-02-18 10:07:52 +13:00
committed by David S. Miller
parent fd8ca89445
commit ca8d4794f6
4 changed files with 115 additions and 56 deletions
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9
include/uapi/linux/mroute.h
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@@ -28,12 +28,19 @@
#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_FLUSH (MRT_BASE+12) /* Flush all mfc entries and/or vifs */
#define MRT_MAX (MRT_BASE+12)
#define SIOCGETVIFCNT SIOCPROTOPRIVATE /* IP protocol privates */
#define SIOCGETSGCNT (SIOCPROTOPRIVATE+1)
#define SIOCGETRPF (SIOCPROTOPRIVATE+2)
/* MRT_FLUSH optional flags */
#define MRT_FLUSH_MFC 1 /* Flush multicast entries */
#define MRT_FLUSH_MFC_STATIC 2 /* Flush static multicast entries */
#define MRT_FLUSH_VIFS 4 /* Flush multicast vifs */
#define MRT_FLUSH_VIFS_STATIC 8 /* Flush static multicast vifs */
#define MAXVIFS 32
typedef unsigned long vifbitmap_t; /* User mode code depends on this lot */
typedef unsigned short vifi_t;