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netlink: extended ACK reporting

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Add the base infrastructure and UAPI for netlink extended ACK
reporting. All "manual" calls to netlink_ack() pass NULL for now and
thus don't get extended ACK reporting.

Big thanks goes to Pablo Neira Ayuso for not only bringing up the
whole topic at netconf (again) but also coming up with the nlattr
passing trick and various other ideas.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg
2017-04-12 14:34:04 +02:00
committed by David S. Miller
parent fb9eb899a6
commit 2d4bc93368
17 changed files with 153 additions and 34 deletions
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3
net/xfrm/xfrm_user.c
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@@ -2448,7 +2448,8 @@ static const struct xfrm_link {
[XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
};
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
struct nlattr *attrs[XFRMA_MAX+1];