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net: macsec: PN wrap callback 

Allow to call macsec_pn_wrapped from hardware drivers to notify when a
PN rolls over. Some drivers might used an interrupt to implement this.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Antoine Tenart 2020-01-13 23:31:47 +01:00 committed by David S. Miller
parent 28c5107aa9
commit 5c937de78b
2 changed files with 21 additions and 6 deletions
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25
drivers/net/macsec.c
View File

@ -424,6 +424,23 @@ static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
return (struct macsec_eth_header *)skb_mac_header(skb);
}
static void __macsec_pn_wrapped(struct macsec_secy *secy,
struct macsec_tx_sa *tx_sa)
{
pr_debug("PN wrapped, transitioning to !oper\n");
tx_sa->active = false;
if (secy->protect_frames)
secy->operational = false;
}
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
{
spin_lock_bh(&tx_sa->lock);
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
}
EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
{
u32 pn;
@ -432,12 +449,8 @@ static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
pn = tx_sa->next_pn;
tx_sa->next_pn++;
if (tx_sa->next_pn == 0) {
pr_debug("PN wrapped, transitioning to !oper\n");
tx_sa->active = false;
if (secy->protect_frames)
secy->operational = false;
}
if (tx_sa->next_pn == 0)
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
return pn;

2
include/net/macsec.h
View File

@ -219,4 +219,6 @@ struct macsec_ops {
int (*mdo_del_txsa)(struct macsec_context *ctx);
};
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa);
#endif /* _NET_MACSEC_H_ */