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net/tls: don't look for decrypted frames on non-offloaded sockets 

If the RX config of a TLS socket is SW, there is no point iterating
over the fragments and checking if frame is decrypted.  It will
always be fully encrypted.  Note that in fully encrypted case
the function doesn't actually touch any offload-related state,
so it's safe to call for TLS_SW, today.  Soon we will introduce
code which can only be called for offloaded contexts.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-06-03 15:17:01 -07:00 committed by David S. Miller
parent 87b11e0638
commit b9d8fec927
1 changed files with 5 additions and 3 deletions
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8
net/tls/tls_sw.c
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@ -1492,9 +1492,11 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
if (!ctx->decrypted) {
#ifdef CONFIG_TLS_DEVICE
err = tls_device_decrypted(sk, skb);
if (err < 0)
return err;
if (tls_ctx->rx_conf == TLS_HW) {
err = tls_device_decrypted(sk, skb);
if (err < 0)
return err;
}
#endif
/* Still not decrypted after tls_device */
if (!ctx->decrypted) {