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Date: Tue, 24 Nov 2020 18:24:46 +0300
From: Vadim Fedorenko <vfedorenko@...ek.ru>
To: Jakub Kicinski <kuba@...nel.org>,
Boris Pismenny <borisp@...dia.com>,
Aviad Yehezkel <aviadye@...dia.com>
Cc: Vadim Fedorenko <vfedorenko@...ek.ru>, netdev@...r.kernel.org,
linux-crypto@...r.kernel.org
Subject: [net-next v2 1/5] net/tls: make inline helpers protocol-aware
Inline functions defined in tls.h have a lot of AES-specific
constants. Remove these constants and change argument to struct
tls_prot_info to have an access to cipher type in later patches
Signed-off-by: Vadim Fedorenko <vfedorenko@...ek.ru>
---
include/net/tls.h | 26 ++++++++++++--------------
net/tls/tls_device.c | 2 +-
net/tls/tls_device_fallback.c | 13 +++++++------
net/tls/tls_sw.c | 12 +++++-------
4 files changed, 25 insertions(+), 28 deletions(-)
diff --git a/include/net/tls.h b/include/net/tls.h
index cf14730..d04ce73 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -502,31 +502,30 @@ static inline void tls_advance_record_sn(struct sock *sk,
tls_err_abort(sk, EBADMSG);
if (prot->version != TLS_1_3_VERSION)
- tls_bigint_increment(ctx->iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
+ tls_bigint_increment(ctx->iv + prot->salt_size,
prot->iv_size);
}
static inline void tls_fill_prepend(struct tls_context *ctx,
char *buf,
size_t plaintext_len,
- unsigned char record_type,
- int version)
+ unsigned char record_type)
{
struct tls_prot_info *prot = &ctx->prot_info;
size_t pkt_len, iv_size = prot->iv_size;
pkt_len = plaintext_len + prot->tag_size;
- if (version != TLS_1_3_VERSION) {
+ if (prot->version != TLS_1_3_VERSION) {
pkt_len += iv_size;
memcpy(buf + TLS_NONCE_OFFSET,
- ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv_size);
+ ctx->tx.iv + prot->salt_size, iv_size);
}
/* we cover nonce explicit here as well, so buf should be of
* size KTLS_DTLS_HEADER_SIZE + KTLS_DTLS_NONCE_EXPLICIT_SIZE
*/
- buf[0] = version == TLS_1_3_VERSION ?
+ buf[0] = prot->version == TLS_1_3_VERSION ?
TLS_RECORD_TYPE_DATA : record_type;
/* Note that VERSION must be TLS_1_2 for both TLS1.2 and TLS1.3 */
buf[1] = TLS_1_2_VERSION_MINOR;
@@ -539,18 +538,17 @@ static inline void tls_fill_prepend(struct tls_context *ctx,
static inline void tls_make_aad(char *buf,
size_t size,
char *record_sequence,
- int record_sequence_size,
unsigned char record_type,
- int version)
+ struct tls_prot_info *prot)
{
- if (version != TLS_1_3_VERSION) {
- memcpy(buf, record_sequence, record_sequence_size);
+ if (prot->version != TLS_1_3_VERSION) {
+ memcpy(buf, record_sequence, prot->rec_seq_size);
buf += 8;
} else {
- size += TLS_CIPHER_AES_GCM_128_TAG_SIZE;
+ size += prot->tag_size;
}
- buf[0] = version == TLS_1_3_VERSION ?
+ buf[0] = prot->version == TLS_1_3_VERSION ?
TLS_RECORD_TYPE_DATA : record_type;
buf[1] = TLS_1_2_VERSION_MAJOR;
buf[2] = TLS_1_2_VERSION_MINOR;
@@ -558,11 +556,11 @@ static inline void tls_make_aad(char *buf,
buf[4] = size & 0xFF;
}
-static inline void xor_iv_with_seq(int version, char *iv, char *seq)
+static inline void xor_iv_with_seq(struct tls_prot_info *prot, char *iv, char *seq)
{
int i;
- if (version == TLS_1_3_VERSION) {
+ if (prot->version == TLS_1_3_VERSION) {
for (i = 0; i < 8; i++)
iv[i + 4] ^= seq[i];
}
diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 54d3e16..6f93ad5 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -327,7 +327,7 @@ static int tls_device_record_close(struct sock *sk,
/* fill prepend */
tls_fill_prepend(ctx, skb_frag_address(&record->frags[0]),
record->len - prot->overhead_size,
- record_type, prot->version);
+ record_type);
return ret;
}
diff --git a/net/tls/tls_device_fallback.c b/net/tls/tls_device_fallback.c
index 2889533..d946817 100644
--- a/net/tls/tls_device_fallback.c
+++ b/net/tls/tls_device_fallback.c
@@ -49,7 +49,8 @@ static int tls_enc_record(struct aead_request *aead_req,
struct crypto_aead *aead, char *aad,
char *iv, __be64 rcd_sn,
struct scatter_walk *in,
- struct scatter_walk *out, int *in_len)
+ struct scatter_walk *out, int *in_len,
+ struct tls_prot_info *prot)
{
unsigned char buf[TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE];
struct scatterlist sg_in[3];
@@ -73,8 +74,7 @@ static int tls_enc_record(struct aead_request *aead_req,
len -= TLS_CIPHER_AES_GCM_128_IV_SIZE;
tls_make_aad(aad, len - TLS_CIPHER_AES_GCM_128_TAG_SIZE,
- (char *)&rcd_sn, sizeof(rcd_sn), buf[0],
- TLS_1_2_VERSION);
+ (char *)&rcd_sn, buf[0], prot);
memcpy(iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, buf + TLS_HEADER_SIZE,
TLS_CIPHER_AES_GCM_128_IV_SIZE);
@@ -140,7 +140,7 @@ static struct aead_request *tls_alloc_aead_request(struct crypto_aead *aead,
static int tls_enc_records(struct aead_request *aead_req,
struct crypto_aead *aead, struct scatterlist *sg_in,
struct scatterlist *sg_out, char *aad, char *iv,
- u64 rcd_sn, int len)
+ u64 rcd_sn, int len, struct tls_prot_info *prot)
{
struct scatter_walk out, in;
int rc;
@@ -150,7 +150,7 @@ static int tls_enc_records(struct aead_request *aead_req,
do {
rc = tls_enc_record(aead_req, aead, aad, iv,
- cpu_to_be64(rcd_sn), &in, &out, &len);
+ cpu_to_be64(rcd_sn), &in, &out, &len, prot);
rcd_sn++;
} while (rc == 0 && len);
@@ -348,7 +348,8 @@ static struct sk_buff *tls_enc_skb(struct tls_context *tls_ctx,
payload_len, sync_size, dummy_buf);
if (tls_enc_records(aead_req, ctx->aead_send, sg_in, sg_out, aad, iv,
- rcd_sn, sync_size + payload_len) < 0)
+ rcd_sn, sync_size + payload_len,
+ &tls_ctx->prot_info) < 0)
goto free_nskb;
complete_skb(nskb, skb, tcp_payload_offset);
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 2fe9e2c..6bc757a 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -505,7 +505,7 @@ static int tls_do_encryption(struct sock *sk,
memcpy(&rec->iv_data[iv_offset], tls_ctx->tx.iv,
prot->iv_size + prot->salt_size);
- xor_iv_with_seq(prot->version, rec->iv_data, tls_ctx->tx.rec_seq);
+ xor_iv_with_seq(prot, rec->iv_data, tls_ctx->tx.rec_seq);
sge->offset += prot->prepend_size;
sge->length -= prot->prepend_size;
@@ -748,14 +748,13 @@ static int tls_push_record(struct sock *sk, int flags,
sg_chain(rec->sg_aead_out, 2, &msg_en->sg.data[i]);
tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,
- tls_ctx->tx.rec_seq, prot->rec_seq_size,
- record_type, prot->version);
+ tls_ctx->tx.rec_seq, record_type, prot);
tls_fill_prepend(tls_ctx,
page_address(sg_page(&msg_en->sg.data[i])) +
msg_en->sg.data[i].offset,
msg_pl->sg.size + prot->tail_size,
- record_type, prot->version);
+ record_type);
tls_ctx->pending_open_record_frags = false;
@@ -1471,13 +1470,12 @@ static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
else
memcpy(iv + iv_offset, tls_ctx->rx.iv, prot->salt_size);
- xor_iv_with_seq(prot->version, iv, tls_ctx->rx.rec_seq);
+ xor_iv_with_seq(prot, iv, tls_ctx->rx.rec_seq);
/* Prepare AAD */
tls_make_aad(aad, rxm->full_len - prot->overhead_size +
prot->tail_size,
- tls_ctx->rx.rec_seq, prot->rec_seq_size,
- ctx->control, prot->version);
+ tls_ctx->rx.rec_seq, ctx->control, prot);
/* Prepare sgin */
sg_init_table(sgin, n_sgin);
--
1.8.3.1
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