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tls: rx: use a define for tag length

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TLS 1.3 has to strip padding, and it starts out 16 bytes
from the end of the record. Make it clear this is because
of the auth tag.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-04-07 20:38:19 -07:00 committed by David S. Miller
parent 863533e316
commit a8340cc02b
2 changed files with 3 additions and 2 deletions
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1
include/net/tls.h
View file

@ -64,6 +64,7 @@
#define TLS_AAD_SPACE_SIZE 13
#define MAX_IV_SIZE 16
#define TLS_TAG_SIZE 16
#define TLS_MAX_REC_SEQ_SIZE 8
/* For CCM mode, the full 16-bytes of IV is made of '4' fields of given sizes.

4
net/tls/tls_sw.c
View file

@ -136,9 +136,9 @@ static int padding_length(struct tls_prot_info *prot, struct sk_buff *skb)
/* Determine zero-padding length */
if (prot->version == TLS_1_3_VERSION) {
int back = TLS_TAG_SIZE + 1;
char content_type = 0;
int err;
int back = 17;
while (content_type == 0) {
if (back > rxm->full_len - prot->prepend_size)
@ -2496,7 +2496,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
/* Sanity-check the sizes for stack allocations. */
if (iv_size > MAX_IV_SIZE || nonce_size > MAX_IV_SIZE ||
rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
rec_seq_size > TLS_MAX_REC_SEQ_SIZE || tag_size != TLS_TAG_SIZE) {
rc = -EINVAL;
goto free_priv;
}