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net: add dst_pending_confirm flag to skbuff

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Add new skbuff flag to allow protocols to confirm neighbour.
When same struct dst_entry can be used for many different
neighbours we can not use it for pending confirmations.

Add sock_confirm_neigh() helper to confirm the neighbour and
use it for IPv4, IPv6 and VRF before dst_neigh_output.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Anastasov 2017-02-06 23:14:12 +02:00 • committed by David S. Miller
commit 4ff0620354
5 changed files with 35 additions and 2 deletions
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14
include/net/sock.h
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@ -1821,6 +1821,20 @@ static inline void sk_dst_confirm(struct sock *sk)
sk->sk_dst_pending_confirm = 1;
}
static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n)
{
if (skb_get_dst_pending_confirm(skb)) {
struct sock *sk = skb->sk;
unsigned long now = jiffies;
/* avoid dirtying neighbour */
if (n->confirmed != now)
n->confirmed = now;
if (sk && sk->sk_dst_pending_confirm)
sk->sk_dst_pending_confirm = 0;
}
}
bool sk_mc_loop(struct sock *sk);
static inline bool sk_can_gso(const struct sock *sk)