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tls: rx: only copy IV from the packet for TLS 1.2 

TLS 1.3 and ChaChaPoly don't carry IV in the packet.
The code before this change would copy out iv_size
worth of whatever followed the TLS header in the packet
and then for TLS 1.3 | ChaCha overwrite that with
the sequence number. Waste of cycles especially
with TLS 1.2 being close to dead and TLS 1.3 being
the common case.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-04-11 12:19:17 -07:00 committed by David S. Miller
parent f7d45f4b52
commit a4ae58cdb6
1 changed files with 10 additions and 10 deletions
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20
net/tls/tls_sw.c
View File

@ -1482,20 +1482,20 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
}
/* Prepare IV */
err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
iv + iv_offset + prot->salt_size,
prot->iv_size);
if (err < 0) {
kfree(mem);
return err;
}
if (prot->version == TLS_1_3_VERSION ||
prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305)
prot->cipher_type == TLS_CIPHER_CHACHA20_POLY1305) {
memcpy(iv + iv_offset, tls_ctx->rx.iv,
prot->iv_size + prot->salt_size);
else
} else {
err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
iv + iv_offset + prot->salt_size,
prot->iv_size);
if (err < 0) {
kfree(mem);
return err;
}
memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
}
xor_iv_with_seq(prot, iv + iv_offset, tls_ctx->rx.rec_seq);
/* Prepare AAD */