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author | David Herrmann <dh.herrmann@gmail.com> | 2015-06-17 17:14:33 +0200 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2015-06-21 10:18:18 -0700 |
commit | b42be38b2778eda2237fc759e55e3b698b05b315 (patch) | |
tree | 52e997d4f7487cc1f09f503bb22df0a132d9dc1a /include/uapi | |
parent | e0df02e0c2118892b302e8248dbbb21698bedfed (diff) | |
download | op-kernel-dev-b42be38b2778eda2237fc759e55e3b698b05b315.zip op-kernel-dev-b42be38b2778eda2237fc759e55e3b698b05b315.tar.gz |
netlink: add API to retrieve all group memberships
This patch adds getsockopt(SOL_NETLINK, NETLINK_LIST_MEMBERSHIPS) to
retrieve all groups a socket is a member of. Currently, we have to use
getsockname() and look at the nl.nl_groups bitmask. However, this mask is
limited to 32 groups. Hence, similar to NETLINK_ADD_MEMBERSHIP and
NETLINK_DROP_MEMBERSHIP, this adds a separate sockopt to manager higher
groups IDs than 32.
This new NETLINK_LIST_MEMBERSHIPS option takes a pointer to __u32 and the
size of the array. The array is filled with the full membership-set of the
socket, and the required array size is returned in optlen. Hence,
user-space can retry with a properly sized array in case it was too small.
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi')
-rw-r--r-- | include/uapi/linux/netlink.h | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h index 3e34b7d..cf6a65c 100644 --- a/include/uapi/linux/netlink.h +++ b/include/uapi/linux/netlink.h @@ -101,14 +101,15 @@ struct nlmsgerr { struct nlmsghdr msg; }; -#define NETLINK_ADD_MEMBERSHIP 1 -#define NETLINK_DROP_MEMBERSHIP 2 -#define NETLINK_PKTINFO 3 -#define NETLINK_BROADCAST_ERROR 4 -#define NETLINK_NO_ENOBUFS 5 -#define NETLINK_RX_RING 6 -#define NETLINK_TX_RING 7 -#define NETLINK_LISTEN_ALL_NSID 8 +#define NETLINK_ADD_MEMBERSHIP 1 +#define NETLINK_DROP_MEMBERSHIP 2 +#define NETLINK_PKTINFO 3 +#define NETLINK_BROADCAST_ERROR 4 +#define NETLINK_NO_ENOBUFS 5 +#define NETLINK_RX_RING 6 +#define NETLINK_TX_RING 7 +#define NETLINK_LISTEN_ALL_NSID 8 +#define NETLINK_LIST_MEMBERSHIPS 9 struct nl_pktinfo { __u32 group; |