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netlink: add nl_set_extack_cookie_u64() 

Add a helper function nl_set_extack_cookie_u64() to use a u64 as
the netlink extended ACK cookie, to avoid having to open-code it
in any users of the cookie.

A u64 should be sufficient for most subsystems though we allow
for up to 20 bytes right now. This also matches the cookies in
nl80211 where I intend to use this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2018-08-23 10:48:13 +02:00
parent e0ba709543
commit 801f87469e
1 changed files with 9 additions and 0 deletions
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9
include/linux/netlink.h
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@ -110,6 +110,15 @@ struct netlink_ext_ack {
} \
} while (0)
static inline void nl_set_extack_cookie_u64(struct netlink_ext_ack *extack,
u64 cookie)
{
u64 __cookie = cookie;
memcpy(extack->cookie, &__cookie, sizeof(__cookie));
extack->cookie_len = sizeof(__cookie);
}
extern void netlink_kernel_release(struct sock *sk);
extern int __netlink_change_ngroups(struct sock *sk, unsigned int groups);
extern int netlink_change_ngroups(struct sock *sk, unsigned int groups);