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tls: Remove redundant vars from tls record structure
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Structure 'tls_rec' contains sg_aead_in and sg_aead_out which point
to a aad_space and then chain scatterlists sg_plaintext_data,
sg_encrypted_data respectively. Rather than using chained scatterlists
for plaintext and encrypted data in aead_req, it is efficient to store
aad_space in sg_encrypted_data and sg_plaintext_data itself in the
first index and get rid of sg_aead_in, sg_aead_in and further chaining.

This requires increasing size of sg_encrypted_data & sg_plaintext_data
arrarys by 1 to accommodate entry for aad_space. The code which uses
sg_encrypted_data and sg_plaintext_data has been modified to skip first
index as it points to aad_space.

Signed-off-by: Vakul Garg <vakul.garg@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Vakul Garg authored and David S. Miller committed Sep 29, 2018
1 parent 6e9feb3 commit 80ece6a
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Showing 2 changed files with 45 additions and 53 deletions.
6 changes: 2 additions & 4 deletions include/net/tls.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -101,13 +101,11 @@ struct tls_rec {
struct list_head list;
int tx_ready;
int tx_flags;
struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS];
struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS];

/* AAD | sg_plaintext_data | sg_tag */
struct scatterlist sg_aead_in[2];
struct scatterlist sg_plaintext_data[MAX_SKB_FRAGS + 1];
/* AAD | sg_encrypted_data (data contain overhead for hdr&iv&tag) */
struct scatterlist sg_aead_out[2];
struct scatterlist sg_encrypted_data[MAX_SKB_FRAGS + 1];

unsigned int sg_plaintext_size;
unsigned int sg_encrypted_size;
Expand Down
92 changes: 43 additions & 49 deletions net/tls/tls_sw.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -248,15 +248,15 @@ static void trim_both_sgl(struct sock *sk, int target_size)
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
struct tls_rec *rec = ctx->open_rec;

trim_sg(sk, rec->sg_plaintext_data,
trim_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size,
target_size);

if (target_size > 0)
target_size += tls_ctx->tx.overhead_size;

trim_sg(sk, rec->sg_encrypted_data,
trim_sg(sk, &rec->sg_encrypted_data[1],
&rec->sg_encrypted_num_elem,
&rec->sg_encrypted_size,
target_size);
Expand All @@ -270,12 +270,13 @@ static int alloc_encrypted_sg(struct sock *sk, int len)
int rc = 0;

rc = sk_alloc_sg(sk, len,
rec->sg_encrypted_data, 0,
&rec->sg_encrypted_data[1], 0,
&rec->sg_encrypted_num_elem,
&rec->sg_encrypted_size, 0);

if (rc == -ENOSPC)
rec->sg_encrypted_num_elem = ARRAY_SIZE(rec->sg_encrypted_data);
rec->sg_encrypted_num_elem =
ARRAY_SIZE(rec->sg_encrypted_data) - 1;

return rc;
}
Expand All @@ -287,12 +288,15 @@ static int alloc_plaintext_sg(struct sock *sk, int len)
struct tls_rec *rec = ctx->open_rec;
int rc = 0;

rc = sk_alloc_sg(sk, len, rec->sg_plaintext_data, 0,
&rec->sg_plaintext_num_elem, &rec->sg_plaintext_size,
rc = sk_alloc_sg(sk, len,
&rec->sg_plaintext_data[1], 0,
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size,
tls_ctx->pending_open_record_frags);

if (rc == -ENOSPC)
rec->sg_plaintext_num_elem = ARRAY_SIZE(rec->sg_plaintext_data);
rec->sg_plaintext_num_elem =
ARRAY_SIZE(rec->sg_plaintext_data) - 1;

return rc;
}
Expand Down Expand Up @@ -320,11 +324,11 @@ static void tls_free_open_rec(struct sock *sk)
if (!rec)
return;

free_sg(sk, rec->sg_encrypted_data,
free_sg(sk, &rec->sg_encrypted_data[1],
&rec->sg_encrypted_num_elem,
&rec->sg_encrypted_size);

free_sg(sk, rec->sg_plaintext_data,
free_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size);

Expand Down Expand Up @@ -355,7 +359,7 @@ int tls_tx_records(struct sock *sk, int flags)
* Remove the head of tx_list
*/
list_del(&rec->list);
free_sg(sk, rec->sg_plaintext_data,
free_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem, &rec->sg_plaintext_size);

kfree(rec);
Expand All @@ -370,13 +374,13 @@ int tls_tx_records(struct sock *sk, int flags)
tx_flags = flags;

rc = tls_push_sg(sk, tls_ctx,
&rec->sg_encrypted_data[0],
&rec->sg_encrypted_data[1],
0, tx_flags);
if (rc)
goto tx_err;

list_del(&rec->list);
free_sg(sk, rec->sg_plaintext_data,
free_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size);

Expand Down Expand Up @@ -405,16 +409,12 @@ static void tls_encrypt_done(struct crypto_async_request *req, int err)

rec = container_of(aead_req, struct tls_rec, aead_req);

rec->sg_encrypted_data[0].offset -= tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[0].length += tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[1].offset -= tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[1].length += tls_ctx->tx.prepend_size;


/* Free the record if error is previously set on socket */
/* Check if error is previously set on socket */
if (err || sk->sk_err) {
free_sg(sk, rec->sg_encrypted_data,
&rec->sg_encrypted_num_elem, &rec->sg_encrypted_size);

kfree(rec);
rec = NULL;

/* If err is already set on socket, return the same code */
Expand Down Expand Up @@ -449,7 +449,7 @@ static void tls_encrypt_done(struct crypto_async_request *req, int err)

/* Schedule the transmission */
if (!test_and_set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask))
schedule_delayed_work(&ctx->tx_work.work, 1);
schedule_delayed_work(&ctx->tx_work.work, 2);
}

static int tls_do_encryption(struct sock *sk,
Expand All @@ -461,13 +461,14 @@ static int tls_do_encryption(struct sock *sk,
struct tls_rec *rec = ctx->open_rec;
int rc;

rec->sg_encrypted_data[0].offset += tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[0].length -= tls_ctx->tx.prepend_size;
/* Skip the first index as it contains AAD data */
rec->sg_encrypted_data[1].offset += tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[1].length -= tls_ctx->tx.prepend_size;

aead_request_set_tfm(aead_req, ctx->aead_send);
aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
aead_request_set_crypt(aead_req, rec->sg_aead_in,
rec->sg_aead_out,
aead_request_set_crypt(aead_req, rec->sg_plaintext_data,
rec->sg_encrypted_data,
data_len, tls_ctx->tx.iv);

aead_request_set_callback(aead_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
Expand All @@ -480,8 +481,8 @@ static int tls_do_encryption(struct sock *sk,
rc = crypto_aead_encrypt(aead_req);
if (!rc || rc != -EINPROGRESS) {
atomic_dec(&ctx->encrypt_pending);
rec->sg_encrypted_data[0].offset -= tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[0].length += tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[1].offset -= tls_ctx->tx.prepend_size;
rec->sg_encrypted_data[1].length += tls_ctx->tx.prepend_size;
}

if (!rc) {
Expand Down Expand Up @@ -512,16 +513,16 @@ static int tls_push_record(struct sock *sk, int flags,
rec->tx_flags = flags;
req = &rec->aead_req;

sg_mark_end(rec->sg_plaintext_data + rec->sg_plaintext_num_elem - 1);
sg_mark_end(rec->sg_encrypted_data + rec->sg_encrypted_num_elem - 1);
sg_mark_end(rec->sg_plaintext_data + rec->sg_plaintext_num_elem);
sg_mark_end(rec->sg_encrypted_data + rec->sg_encrypted_num_elem);

tls_make_aad(rec->aad_space, rec->sg_plaintext_size,
tls_ctx->tx.rec_seq, tls_ctx->tx.rec_seq_size,
record_type);

tls_fill_prepend(tls_ctx,
page_address(sg_page(&rec->sg_encrypted_data[0])) +
rec->sg_encrypted_data[0].offset,
page_address(sg_page(&rec->sg_encrypted_data[1])) +
rec->sg_encrypted_data[1].offset,
rec->sg_plaintext_size, record_type);

tls_ctx->pending_open_record_frags = 0;
Expand Down Expand Up @@ -613,7 +614,7 @@ static int memcopy_from_iter(struct sock *sk, struct iov_iter *from,
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_sw_context_tx *ctx = tls_sw_ctx_tx(tls_ctx);
struct tls_rec *rec = ctx->open_rec;
struct scatterlist *sg = rec->sg_plaintext_data;
struct scatterlist *sg = &rec->sg_plaintext_data[1];
int copy, i, rc = 0;

for (i = tls_ctx->pending_open_record_frags;
Expand Down Expand Up @@ -659,17 +660,10 @@ static struct tls_rec *get_rec(struct sock *sk)
sg_init_table(&rec->sg_encrypted_data[0],
ARRAY_SIZE(rec->sg_encrypted_data));

sg_init_table(rec->sg_aead_in, 2);
sg_set_buf(&rec->sg_aead_in[0], rec->aad_space,
sg_set_buf(&rec->sg_plaintext_data[0], rec->aad_space,
sizeof(rec->aad_space));
sg_unmark_end(&rec->sg_aead_in[1]);
sg_chain(rec->sg_aead_in, 2, rec->sg_plaintext_data);

sg_init_table(rec->sg_aead_out, 2);
sg_set_buf(&rec->sg_aead_out[0], rec->aad_space,
sg_set_buf(&rec->sg_encrypted_data[0], rec->aad_space,
sizeof(rec->aad_space));
sg_unmark_end(&rec->sg_aead_out[1]);
sg_chain(rec->sg_aead_out, 2, rec->sg_encrypted_data);

ctx->open_rec = rec;

Expand Down Expand Up @@ -763,8 +757,8 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
ret = zerocopy_from_iter(sk, &msg->msg_iter,
try_to_copy, &rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size,
rec->sg_plaintext_data,
ARRAY_SIZE(rec->sg_plaintext_data),
&rec->sg_plaintext_data[1],
ARRAY_SIZE(rec->sg_plaintext_data) - 1,
true);
if (ret)
goto fallback_to_reg_send;
Expand All @@ -781,7 +775,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
continue;

fallback_to_reg_send:
trim_sg(sk, rec->sg_plaintext_data,
trim_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size,
orig_size);
Expand All @@ -801,7 +795,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
try_to_copy -= required_size - rec->sg_plaintext_size;
full_record = true;

trim_sg(sk, rec->sg_encrypted_data,
trim_sg(sk, &rec->sg_encrypted_data[1],
&rec->sg_encrypted_num_elem,
&rec->sg_encrypted_size,
rec->sg_plaintext_size +
Expand Down Expand Up @@ -949,7 +943,7 @@ int tls_sw_sendpage(struct sock *sk, struct page *page,
}

get_page(page);
sg = rec->sg_plaintext_data + rec->sg_plaintext_num_elem;
sg = &rec->sg_plaintext_data[1] + rec->sg_plaintext_num_elem;
sg_set_page(sg, page, copy, offset);
sg_unmark_end(sg);

Expand All @@ -963,7 +957,7 @@ int tls_sw_sendpage(struct sock *sk, struct page *page,

if (full_record || eor ||
rec->sg_plaintext_num_elem ==
ARRAY_SIZE(rec->sg_plaintext_data)) {
ARRAY_SIZE(rec->sg_plaintext_data) - 1) {
ret = tls_push_record(sk, flags, record_type);
if (ret) {
if (ret == -EINPROGRESS)
Expand Down Expand Up @@ -1571,7 +1565,7 @@ void tls_sw_free_resources_tx(struct sock *sk)
rec = list_first_entry(&ctx->tx_list,
struct tls_rec, list);

free_sg(sk, rec->sg_plaintext_data,
free_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size);

Expand All @@ -1580,11 +1574,11 @@ void tls_sw_free_resources_tx(struct sock *sk)
}

list_for_each_entry_safe(rec, tmp, &ctx->tx_list, list) {
free_sg(sk, rec->sg_encrypted_data,
free_sg(sk, &rec->sg_encrypted_data[1],
&rec->sg_encrypted_num_elem,
&rec->sg_encrypted_size);

free_sg(sk, rec->sg_plaintext_data,
free_sg(sk, &rec->sg_plaintext_data[1],
&rec->sg_plaintext_num_elem,
&rec->sg_plaintext_size);

Expand Down

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