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net: tls: Refactor tls aad space size calculation 

TLS 1.3 has a different AAD size, use a variable in the code to
make TLS 1.3 support easy.

Signed-off-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Watson 2019-01-30 21:58:12 +00:00 committed by David S. Miller
parent fb99bce712
commit a2ef9b6a22
2 changed files with 10 additions and 8 deletions
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1
include/net/tls.h
View File

@ -202,6 +202,7 @@ struct cipher_context {
char *iv;
u16 rec_seq_size;
char *rec_seq;
u16 aad_size;
};
union tls_crypto_context {

17
net/tls/tls_sw.c
View File

@ -185,7 +185,7 @@ static int tls_do_decryption(struct sock *sk,
int ret;
aead_request_set_tfm(aead_req, ctx->aead_recv);
aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
aead_request_set_ad(aead_req, tls_ctx->rx.aad_size);
aead_request_set_crypt(aead_req, sgin, sgout,
data_len + tls_ctx->rx.tag_size,
(u8 *)iv_recv);
@ -289,12 +289,12 @@ static struct tls_rec *tls_get_rec(struct sock *sk)
sg_init_table(rec->sg_aead_in, 2);
sg_set_buf(&rec->sg_aead_in[0], rec->aad_space,
sizeof(rec->aad_space));
tls_ctx->tx.aad_size);
sg_unmark_end(&rec->sg_aead_in[1]);
sg_init_table(rec->sg_aead_out, 2);
sg_set_buf(&rec->sg_aead_out[0], rec->aad_space,
sizeof(rec->aad_space));
tls_ctx->tx.aad_size);
sg_unmark_end(&rec->sg_aead_out[1]);
return rec;
@ -455,7 +455,7 @@ static int tls_do_encryption(struct sock *sk,
msg_en->sg.curr = start;
aead_request_set_tfm(aead_req, ctx->aead_send);
aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
aead_request_set_ad(aead_req, tls_ctx->tx.aad_size);
aead_request_set_crypt(aead_req, rec->sg_aead_in,
rec->sg_aead_out,
data_len, rec->iv_data);
@ -1317,7 +1317,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
mem_size = aead_size + (nsg * sizeof(struct scatterlist));
mem_size = mem_size + TLS_AAD_SPACE_SIZE;
mem_size = mem_size + tls_ctx->rx.aad_size;
mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv);
/* Allocate a single block of memory which contains
@ -1333,7 +1333,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
sgin = (struct scatterlist *)(mem + aead_size);
sgout = sgin + n_sgin;
aad = (u8 *)(sgout + n_sgout);
iv = aad + TLS_AAD_SPACE_SIZE;
iv = aad + tls_ctx->rx.aad_size;
/* Prepare IV */
err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
@ -1352,7 +1352,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
/* Prepare sgin */
sg_init_table(sgin, n_sgin);
sg_set_buf(&sgin[0], aad, TLS_AAD_SPACE_SIZE);
sg_set_buf(&sgin[0], aad, tls_ctx->rx.aad_size);
err = skb_to_sgvec(skb, &sgin[1],
rxm->offset + tls_ctx->rx.prepend_size,
rxm->full_len - tls_ctx->rx.prepend_size);
@ -1364,7 +1364,7 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
if (n_sgout) {
if (out_iov) {
sg_init_table(sgout, n_sgout);
sg_set_buf(&sgout[0], aad, TLS_AAD_SPACE_SIZE);
sg_set_buf(&sgout[0], aad, tls_ctx->rx.aad_size);
*chunk = 0;
err = tls_setup_from_iter(sk, out_iov, data_len,
@ -2100,6 +2100,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
goto free_priv;
}
cctx->aad_size = TLS_AAD_SPACE_SIZE;
cctx->prepend_size = TLS_HEADER_SIZE + nonce_size;
cctx->tag_size = tag_size;
cctx->overhead_size = cctx->prepend_size + cctx->tag_size;