Hi,
besides a small bugfix, this patchset adds support for dynamic number
of groups to netlink. To support an arbitary number of groups a couple
of changes had to me made, I'll explain them below. The patches are
only sent to netdev to avoid spamming your inboxes.
The destination groups of a packet are currently stored in the cb as a
bitmask. To avoid beeing limited by the size of the cb, support for
broadcasting to multiple groups using a single call to netlink_broadcast
is removed and only a single destination group is supported. which is
stored as an integer in the cb. No users in the kernel used more than a
single destination group.
The subscribed groups bitmask in struct netlink_sock is only 32 bit
wide, it is changed to be dynamically allocated. Currently binding to
a group is possible before a kernel socket for a protocol exists.
To avoid guessing the group number and dealing with reallocations this
is changed and sockets for a protocol can only be created when a
kernel socket exists. Herbert and Thomas agreed that pure userspace
communication is not a good idea with current netlink and the change
should be ok.
For compatibility, userspace can still subscribe to the lower 32 groups
using bind and see which groups a socket is subscribed to using
getsockname, to subscribe/unsubscribe groups in the extended range two
setsockopt options are provided. struct nl_addr can only contain up to
32 groups, to get the destination group of a packet for the extended
range a nl_pktinfo control message can be enabled using another
setsockopt option.
[NETLINK]: Fix module refcounting problems
[NETLINK]: Remove unused groups member from struct netlink_skb_parms
[NETLINK]: Use group numbers instead of bitmasks internally
[NETLINK]: Convert netlink users to use group numbers instead of bitmasks
[NETLINK]: Return -EPROTONOSUPPORT in netlink_create() if no kernel
socket is registered
[NETLINK]: Support dynamic number of multicast groups per netlink family
[NETLINK]: Add set/getsockopt options to support more than 32 groups
[NETLINK]: Add "groups" argument to netlink_kernel_create
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