When this library was originally implemented, support for Linux 2.4 was
important. The Netlink implementation in Linux only added support for
joining and leaving multicast groups after a socket is bound as of Linux
2.6.14, so the library did not support it either. But the current version
of Open vSwitch targets Linux 2.6.18 and over, so it's fine to add this
support now, and this commit does so.
This will be used more extensively in upcoming commits.
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>
Until now, netlink-protocol.h and <linux/netlink.h> could not both be
included by a single source file, because they contained conflicting
definitions. This commit fixes the problem, by having netlink-protocol.h
delegate to <linux/netlink.h> where it is available.
Here's an example of the problem: odp-util.c includes both
datapath-protocol.h and will need netlink-protocol.h also so that it can
look through actions defined as struct nlattr. datapath-protocol.h
includes <linux/if_link.h> for the definition of rtnl_link_stats64, and
<linux/if_link.h> includes <linux/netlink.h>.
Acked-by: Jesse Gross <jesse@nicira.com>
