netlink: extend buffers to 16K

Starting from linux-3.15 (commit 9063e21fb026, "netlink: autosize skb
lengths"), kernel is able to send up to 16K in netlink replies.

This change enables iproute2 commands to get bigger chunks,
without breaking compatibility with old kernels.

Signed-off-by: Eric Dumazet <edumazet@google.com>
2 files changed