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net/tls: Use cipher sizes structs
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Use the newly introduced cipher sizes structs instead of the repeated
switch cases churn.

Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Gal Pressman authored and Jakub Kicinski committed Sep 23, 2022
1 parent 2d2c5ea commit ea7a9d8
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Showing 2 changed files with 76 additions and 51 deletions.
55 changes: 29 additions & 26 deletions net/tls/tls_device.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -902,17 +902,27 @@ static void tls_device_core_ctrl_rx_resync(struct tls_context *tls_ctx,
}

static int
tls_device_reencrypt(struct sock *sk, struct tls_sw_context_rx *sw_ctx)
tls_device_reencrypt(struct sock *sk, struct tls_context *tls_ctx)
{
struct tls_sw_context_rx *sw_ctx = tls_sw_ctx_rx(tls_ctx);
const struct tls_cipher_size_desc *cipher_sz;
int err, offset, copy, data_len, pos;
struct sk_buff *skb, *skb_iter;
struct scatterlist sg[1];
struct strp_msg *rxm;
char *orig_buf, *buf;

switch (tls_ctx->crypto_recv.info.cipher_type) {
case TLS_CIPHER_AES_GCM_128:
break;
default:
return -EINVAL;
}
cipher_sz = &tls_cipher_size_desc[tls_ctx->crypto_recv.info.cipher_type];

rxm = strp_msg(tls_strp_msg(sw_ctx));
orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE +
TLS_CIPHER_AES_GCM_128_IV_SIZE, sk->sk_allocation);
orig_buf = kmalloc(rxm->full_len + TLS_HEADER_SIZE + cipher_sz->iv,
sk->sk_allocation);
if (!orig_buf)
return -ENOMEM;
buf = orig_buf;
Expand All @@ -927,10 +937,8 @@ tls_device_reencrypt(struct sock *sk, struct tls_sw_context_rx *sw_ctx)

sg_init_table(sg, 1);
sg_set_buf(&sg[0], buf,
rxm->full_len + TLS_HEADER_SIZE +
TLS_CIPHER_AES_GCM_128_IV_SIZE);
err = skb_copy_bits(skb, offset, buf,
TLS_HEADER_SIZE + TLS_CIPHER_AES_GCM_128_IV_SIZE);
rxm->full_len + TLS_HEADER_SIZE + cipher_sz->iv);
err = skb_copy_bits(skb, offset, buf, TLS_HEADER_SIZE + cipher_sz->iv);
if (err)
goto free_buf;

Expand All @@ -941,7 +949,7 @@ tls_device_reencrypt(struct sock *sk, struct tls_sw_context_rx *sw_ctx)
else
err = 0;

data_len = rxm->full_len - TLS_CIPHER_AES_GCM_128_TAG_SIZE;
data_len = rxm->full_len - cipher_sz->tag;

if (skb_pagelen(skb) > offset) {
copy = min_t(int, skb_pagelen(skb) - offset, data_len);
Expand Down Expand Up @@ -1024,7 +1032,7 @@ int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
* likely have initial fragments decrypted, and final ones not
* decrypted. We need to reencrypt that single SKB.
*/
return tls_device_reencrypt(sk, sw_ctx);
return tls_device_reencrypt(sk, tls_ctx);
}

/* Return immediately if the record is either entirely plaintext or
Expand All @@ -1041,7 +1049,7 @@ int tls_device_decrypted(struct sock *sk, struct tls_context *tls_ctx)
}

ctx->resync_nh_reset = 1;
return tls_device_reencrypt(sk, sw_ctx);
return tls_device_reencrypt(sk, tls_ctx);
}

static void tls_device_attach(struct tls_context *ctx, struct sock *sk,
Expand All @@ -1062,9 +1070,9 @@ static void tls_device_attach(struct tls_context *ctx, struct sock *sk,

int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
{
u16 nonce_size, tag_size, iv_size, rec_seq_size, salt_size;
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_prot_info *prot = &tls_ctx->prot_info;
const struct tls_cipher_size_desc *cipher_sz;
struct tls_record_info *start_marker_record;
struct tls_offload_context_tx *offload_ctx;
struct tls_crypto_info *crypto_info;
Expand Down Expand Up @@ -1099,44 +1107,39 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)

switch (crypto_info->cipher_type) {
case TLS_CIPHER_AES_GCM_128:
nonce_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
tag_size = TLS_CIPHER_AES_GCM_128_TAG_SIZE;
iv_size = TLS_CIPHER_AES_GCM_128_IV_SIZE;
iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv;
rec_seq_size = TLS_CIPHER_AES_GCM_128_REC_SEQ_SIZE;
salt_size = TLS_CIPHER_AES_GCM_128_SALT_SIZE;
rec_seq =
((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->rec_seq;
break;
default:
rc = -EINVAL;
goto release_netdev;
}
cipher_sz = &tls_cipher_size_desc[crypto_info->cipher_type];

/* Sanity-check the rec_seq_size for stack allocations */
if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
if (cipher_sz->rec_seq > TLS_MAX_REC_SEQ_SIZE) {
rc = -EINVAL;
goto release_netdev;
}

prot->version = crypto_info->version;
prot->cipher_type = crypto_info->cipher_type;
prot->prepend_size = TLS_HEADER_SIZE + nonce_size;
prot->tag_size = tag_size;
prot->prepend_size = TLS_HEADER_SIZE + cipher_sz->iv;
prot->tag_size = cipher_sz->tag;
prot->overhead_size = prot->prepend_size + prot->tag_size;
prot->iv_size = iv_size;
prot->salt_size = salt_size;
ctx->tx.iv = kmalloc(iv_size + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
GFP_KERNEL);
prot->iv_size = cipher_sz->iv;
prot->salt_size = cipher_sz->salt;
ctx->tx.iv = kmalloc(cipher_sz->iv + cipher_sz->salt, GFP_KERNEL);
if (!ctx->tx.iv) {
rc = -ENOMEM;
goto release_netdev;
}

memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
memcpy(ctx->tx.iv + cipher_sz->salt, iv, cipher_sz->iv);

prot->rec_seq_size = rec_seq_size;
ctx->tx.rec_seq = kmemdup(rec_seq, rec_seq_size, GFP_KERNEL);
prot->rec_seq_size = cipher_sz->rec_seq;
ctx->tx.rec_seq = kmemdup(rec_seq, cipher_sz->rec_seq, GFP_KERNEL);
if (!ctx->tx.rec_seq) {
rc = -ENOMEM;
goto free_iv;
Expand Down
72 changes: 47 additions & 25 deletions net/tls/tls_device_fallback.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -54,13 +54,24 @@ static int tls_enc_record(struct aead_request *aead_req,
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];
unsigned char buf[TLS_HEADER_SIZE + MAX_IV_SIZE];
const struct tls_cipher_size_desc *cipher_sz;
struct scatterlist sg_in[3];
struct scatterlist sg_out[3];
unsigned int buf_size;
u16 len;
int rc;

len = min_t(int, *in_len, ARRAY_SIZE(buf));
switch (prot->cipher_type) {
case TLS_CIPHER_AES_GCM_128:
break;
default:
return -EINVAL;
}
cipher_sz = &tls_cipher_size_desc[prot->cipher_type];

buf_size = TLS_HEADER_SIZE + cipher_sz->iv;
len = min_t(int, *in_len, buf_size);

scatterwalk_copychunks(buf, in, len, 0);
scatterwalk_copychunks(buf, out, len, 1);
Expand All @@ -73,13 +84,11 @@ static int tls_enc_record(struct aead_request *aead_req,
scatterwalk_pagedone(out, 1, 1);

len = buf[4] | (buf[3] << 8);
len -= TLS_CIPHER_AES_GCM_128_IV_SIZE;
len -= cipher_sz->iv;

tls_make_aad(aad, len - TLS_CIPHER_AES_GCM_128_TAG_SIZE,
(char *)&rcd_sn, buf[0], prot);
tls_make_aad(aad, len - cipher_sz->tag, (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);
memcpy(iv + cipher_sz->salt, buf + TLS_HEADER_SIZE, cipher_sz->iv);

sg_init_table(sg_in, ARRAY_SIZE(sg_in));
sg_init_table(sg_out, ARRAY_SIZE(sg_out));
Expand All @@ -90,7 +99,7 @@ static int tls_enc_record(struct aead_request *aead_req,

*in_len -= len;
if (*in_len < 0) {
*in_len += TLS_CIPHER_AES_GCM_128_TAG_SIZE;
*in_len += cipher_sz->tag;
/* the input buffer doesn't contain the entire record.
* trim len accordingly. The resulting authentication tag
* will contain garbage, but we don't care, so we won't
Expand All @@ -111,7 +120,7 @@ static int tls_enc_record(struct aead_request *aead_req,
scatterwalk_pagedone(out, 1, 1);
}

len -= TLS_CIPHER_AES_GCM_128_TAG_SIZE;
len -= cipher_sz->tag;
aead_request_set_crypt(aead_req, sg_in, sg_out, len, iv);

rc = crypto_aead_encrypt(aead_req);
Expand Down Expand Up @@ -299,11 +308,14 @@ static void fill_sg_out(struct scatterlist sg_out[3], void *buf,
int sync_size,
void *dummy_buf)
{
const struct tls_cipher_size_desc *cipher_sz =
&tls_cipher_size_desc[tls_ctx->crypto_send.info.cipher_type];

sg_set_buf(&sg_out[0], dummy_buf, sync_size);
sg_set_buf(&sg_out[1], nskb->data + tcp_payload_offset, payload_len);
/* Add room for authentication tag produced by crypto */
dummy_buf += sync_size;
sg_set_buf(&sg_out[2], dummy_buf, TLS_CIPHER_AES_GCM_128_TAG_SIZE);
sg_set_buf(&sg_out[2], dummy_buf, cipher_sz->tag);
}

static struct sk_buff *tls_enc_skb(struct tls_context *tls_ctx,
Expand All @@ -315,7 +327,8 @@ static struct sk_buff *tls_enc_skb(struct tls_context *tls_ctx,
struct tls_offload_context_tx *ctx = tls_offload_ctx_tx(tls_ctx);
int tcp_payload_offset = skb_tcp_all_headers(skb);
int payload_len = skb->len - tcp_payload_offset;
void *buf, *iv, *aad, *dummy_buf;
const struct tls_cipher_size_desc *cipher_sz;
void *buf, *iv, *aad, *dummy_buf, *salt;
struct aead_request *aead_req;
struct sk_buff *nskb = NULL;
int buf_len;
Expand All @@ -324,20 +337,23 @@ static struct sk_buff *tls_enc_skb(struct tls_context *tls_ctx,
if (!aead_req)
return NULL;

buf_len = TLS_CIPHER_AES_GCM_128_SALT_SIZE +
TLS_CIPHER_AES_GCM_128_IV_SIZE +
TLS_AAD_SPACE_SIZE +
sync_size +
TLS_CIPHER_AES_GCM_128_TAG_SIZE;
switch (tls_ctx->crypto_send.info.cipher_type) {
case TLS_CIPHER_AES_GCM_128:
salt = tls_ctx->crypto_send.aes_gcm_128.salt;
break;
default:
return NULL;
}
cipher_sz = &tls_cipher_size_desc[tls_ctx->crypto_send.info.cipher_type];
buf_len = cipher_sz->salt + cipher_sz->iv + TLS_AAD_SPACE_SIZE +
sync_size + cipher_sz->tag;
buf = kmalloc(buf_len, GFP_ATOMIC);
if (!buf)
goto free_req;

iv = buf;
memcpy(iv, tls_ctx->crypto_send.aes_gcm_128.salt,
TLS_CIPHER_AES_GCM_128_SALT_SIZE);
aad = buf + TLS_CIPHER_AES_GCM_128_SALT_SIZE +
TLS_CIPHER_AES_GCM_128_IV_SIZE;
memcpy(iv, salt, cipher_sz->salt);
aad = buf + cipher_sz->salt + cipher_sz->iv;
dummy_buf = aad + TLS_AAD_SPACE_SIZE;

nskb = alloc_skb(skb_headroom(skb) + skb->len, GFP_ATOMIC);
Expand Down Expand Up @@ -451,6 +467,7 @@ int tls_sw_fallback_init(struct sock *sk,
struct tls_offload_context_tx *offload_ctx,
struct tls_crypto_info *crypto_info)
{
const struct tls_cipher_size_desc *cipher_sz;
const u8 *key;
int rc;

Expand All @@ -463,15 +480,20 @@ int tls_sw_fallback_init(struct sock *sk,
goto err_out;
}

key = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->key;
switch (crypto_info->cipher_type) {
case TLS_CIPHER_AES_GCM_128:
key = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->key;
break;
default:
return -EINVAL;
}
cipher_sz = &tls_cipher_size_desc[crypto_info->cipher_type];

rc = crypto_aead_setkey(offload_ctx->aead_send, key,
TLS_CIPHER_AES_GCM_128_KEY_SIZE);
rc = crypto_aead_setkey(offload_ctx->aead_send, key, cipher_sz->key);
if (rc)
goto free_aead;

rc = crypto_aead_setauthsize(offload_ctx->aead_send,
TLS_CIPHER_AES_GCM_128_TAG_SIZE);
rc = crypto_aead_setauthsize(offload_ctx->aead_send, cipher_sz->tag);
if (rc)
goto free_aead;

Expand Down

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