These are really just copies of the corresponding "put" functions. An
upcoming commit will introduce a user of nl_msg_push_u32(). I thought I
might as well create all of these while I was at it.
Many of our functions pass around a pointer to Netlink attributes
and a length. This exposes the version of nl_attr_find that takes
that format so it can be used by callers outside the Netlink library.
This warning doesn't indicate a genuine problem, since 'nla' must be
aligned properly and NLA_ALIGN ensures that the offset is aligned properly
too. Casting via void * suppresses the warning.
These are semantically identical, so they might as well share existing
values, but they help to document the endianness of attributes in Netlink
attribute policies.
Acked-by: Jesse Gross <jesse@nicira.com>
These functions are useful in the occasional case where a piece of code
only cares about one or a few attributes, probably knows that the format
is correct, and doesn't want to go to the trouble of doing a full parse.
Upcoming commits will add a user.
Reviewed by Justin Pettit.
Linux since v2.6.24 has a couple of couple of bits at the top of
nla_type that one is apparently supposed to ignore. This commit
starts doing that in Open vSwitch userspace.
Acked-by: Jesse Gross <jesse@nicira.com>
These _be<N> functions are completely equivalent to the corresponding
_u<N> functions, but the names help to make their purpose clear.
Acked-by: Jesse Gross <jesse@nicira.com>
The parts of the netlink module that are related to sockets are
Linux-specific, since only Linux has AF_NETLINK sockets. The rest can be
built anywhere. This commit breaks them into two modules, and builds the
generic one on all platforms.
Acked-by: Jesse Gross <jesse@nicira.com>
Fairly often it happens that nested Netlink attributes must themselves
contain Netlink attributes. In such a case, nlmsg_put_nested() is not so
convenient, because it requires the contents to be pre-assembled and then
copied into place. This commit introduces a new interface that instead
allows the nested attributes to be assembled in-place. As a demonstration,
it updates nl_msg_put_nested() to use this new interface.
These two functions use their "sock" parameter only to figure out the
nlmsg_pid to put in the nlmsghdr. But that field can be filled in just
as well right before sending the message. Since our functions for sending
Netlink messages always modify the nlmsghdr anyhow (to fill in the length),
there is little benefit to filling in the nlmsg_pid in advance. The cost,
on the other hand, is having to pass another argument to functions that
already have too many. So this commit removes the argument.
