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net/tls: Combined memory allocation for decryption request
For preparing decryption request, several memory chunks are required (aead_req, sgin, sgout, iv, aad). For submitting the decrypt request to an accelerator, it is required that the buffers which are read by the accelerator must be dma-able and not come from stack. The buffers for aad and iv can be separately kmalloced each, but it is inefficient. This patch does a combined allocation for preparing decryption request and then segments into aead_req || sgin || sgout || iv || aad. Signed-off-by: Vakul Garg <vakul.garg@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vakul Garg
David S. Miller
parent
78cbac647e
commit
0b243d004e
@ -124,10 +124,6 @@ struct tls_sw_context_rx {
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struct sk_buff *recv_pkt;
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u8 control;
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bool decrypted;
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char rx_aad_ciphertext[TLS_AAD_SPACE_SIZE];
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char rx_aad_plaintext[TLS_AAD_SPACE_SIZE];
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};
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struct tls_record_info {
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236
net/tls/tls_sw.c
236
net/tls/tls_sw.c
@ -48,19 +48,13 @@ static int tls_do_decryption(struct sock *sk,
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struct scatterlist *sgout,
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char *iv_recv,
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size_t data_len,
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struct sk_buff *skb,
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gfp_t flags)
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struct aead_request *aead_req)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
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struct aead_request *aead_req;
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int ret;
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aead_req = aead_request_alloc(ctx->aead_recv, flags);
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if (!aead_req)
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return -ENOMEM;
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aead_request_set_tfm(aead_req, ctx->aead_recv);
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aead_request_set_ad(aead_req, TLS_AAD_SPACE_SIZE);
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aead_request_set_crypt(aead_req, sgin, sgout,
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data_len + tls_ctx->rx.tag_size,
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@ -69,8 +63,6 @@ static int tls_do_decryption(struct sock *sk,
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crypto_req_done, &ctx->async_wait);
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ret = crypto_wait_req(crypto_aead_decrypt(aead_req), &ctx->async_wait);
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aead_request_free(aead_req);
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return ret;
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}
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@ -657,8 +649,132 @@ static struct sk_buff *tls_wait_data(struct sock *sk, int flags,
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return skb;
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}
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/* This function decrypts the input skb into either out_iov or in out_sg
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* or in skb buffers itself. The input parameter 'zc' indicates if
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* zero-copy mode needs to be tried or not. With zero-copy mode, either
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* out_iov or out_sg must be non-NULL. In case both out_iov and out_sg are
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* NULL, then the decryption happens inside skb buffers itself, i.e.
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* zero-copy gets disabled and 'zc' is updated.
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*/
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static int decrypt_internal(struct sock *sk, struct sk_buff *skb,
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struct iov_iter *out_iov,
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struct scatterlist *out_sg,
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int *chunk, bool *zc)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
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struct strp_msg *rxm = strp_msg(skb);
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int n_sgin, n_sgout, nsg, mem_size, aead_size, err, pages = 0;
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struct aead_request *aead_req;
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struct sk_buff *unused;
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u8 *aad, *iv, *mem = NULL;
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struct scatterlist *sgin = NULL;
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struct scatterlist *sgout = NULL;
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const int data_len = rxm->full_len - tls_ctx->rx.overhead_size;
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if (*zc && (out_iov || out_sg)) {
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if (out_iov)
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n_sgout = iov_iter_npages(out_iov, INT_MAX) + 1;
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else
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n_sgout = sg_nents(out_sg);
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} else {
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n_sgout = 0;
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*zc = false;
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}
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n_sgin = skb_cow_data(skb, 0, &unused);
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if (n_sgin < 1)
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return -EBADMSG;
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/* Increment to accommodate AAD */
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n_sgin = n_sgin + 1;
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nsg = n_sgin + n_sgout;
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aead_size = sizeof(*aead_req) + crypto_aead_reqsize(ctx->aead_recv);
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mem_size = aead_size + (nsg * sizeof(struct scatterlist));
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mem_size = mem_size + TLS_AAD_SPACE_SIZE;
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mem_size = mem_size + crypto_aead_ivsize(ctx->aead_recv);
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/* Allocate a single block of memory which contains
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* aead_req || sgin[] || sgout[] || aad || iv.
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* This order achieves correct alignment for aead_req, sgin, sgout.
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*/
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mem = kmalloc(mem_size, sk->sk_allocation);
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if (!mem)
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return -ENOMEM;
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/* Segment the allocated memory */
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aead_req = (struct aead_request *)mem;
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sgin = (struct scatterlist *)(mem + aead_size);
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sgout = sgin + n_sgin;
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aad = (u8 *)(sgout + n_sgout);
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iv = aad + TLS_AAD_SPACE_SIZE;
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/* Prepare IV */
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err = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
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iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
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tls_ctx->rx.iv_size);
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if (err < 0) {
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kfree(mem);
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return err;
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}
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memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
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/* Prepare AAD */
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tls_make_aad(aad, rxm->full_len - tls_ctx->rx.overhead_size,
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tls_ctx->rx.rec_seq, tls_ctx->rx.rec_seq_size,
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ctx->control);
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/* Prepare sgin */
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sg_init_table(sgin, n_sgin);
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sg_set_buf(&sgin[0], aad, TLS_AAD_SPACE_SIZE);
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err = skb_to_sgvec(skb, &sgin[1],
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rxm->offset + tls_ctx->rx.prepend_size,
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rxm->full_len - tls_ctx->rx.prepend_size);
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if (err < 0) {
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kfree(mem);
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return err;
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}
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if (n_sgout) {
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if (out_iov) {
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sg_init_table(sgout, n_sgout);
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sg_set_buf(&sgout[0], aad, TLS_AAD_SPACE_SIZE);
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*chunk = 0;
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err = zerocopy_from_iter(sk, out_iov, data_len, &pages,
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chunk, &sgout[1],
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(n_sgout - 1), false);
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if (err < 0)
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goto fallback_to_reg_recv;
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} else if (out_sg) {
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memcpy(sgout, out_sg, n_sgout * sizeof(*sgout));
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} else {
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goto fallback_to_reg_recv;
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}
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} else {
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fallback_to_reg_recv:
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sgout = sgin;
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pages = 0;
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*chunk = 0;
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*zc = false;
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}
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/* Prepare and submit AEAD request */
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err = tls_do_decryption(sk, sgin, sgout, iv, data_len, aead_req);
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/* Release the pages in case iov was mapped to pages */
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for (; pages > 0; pages--)
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put_page(sg_page(&sgout[pages]));
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kfree(mem);
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return err;
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}
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static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
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struct scatterlist *sgout, bool *zc)
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struct iov_iter *dest, int *chunk, bool *zc)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
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@ -671,7 +787,7 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
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return err;
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#endif
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if (!ctx->decrypted) {
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err = decrypt_skb(sk, skb, sgout);
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err = decrypt_internal(sk, skb, dest, NULL, chunk, zc);
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if (err < 0)
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return err;
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} else {
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@ -690,54 +806,10 @@ static int decrypt_skb_update(struct sock *sk, struct sk_buff *skb,
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int decrypt_skb(struct sock *sk, struct sk_buff *skb,
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struct scatterlist *sgout)
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{
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struct tls_context *tls_ctx = tls_get_ctx(sk);
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struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
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char iv[TLS_CIPHER_AES_GCM_128_SALT_SIZE + MAX_IV_SIZE];
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struct scatterlist sgin_arr[MAX_SKB_FRAGS + 2];
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struct scatterlist *sgin = &sgin_arr[0];
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struct strp_msg *rxm = strp_msg(skb);
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int ret, nsg = ARRAY_SIZE(sgin_arr);
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struct sk_buff *unused;
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bool zc = true;
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int chunk;
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ret = skb_copy_bits(skb, rxm->offset + TLS_HEADER_SIZE,
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iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE,
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tls_ctx->rx.iv_size);
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if (ret < 0)
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return ret;
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memcpy(iv, tls_ctx->rx.iv, TLS_CIPHER_AES_GCM_128_SALT_SIZE);
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if (!sgout) {
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nsg = skb_cow_data(skb, 0, &unused) + 1;
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sgin = kmalloc_array(nsg, sizeof(*sgin), sk->sk_allocation);
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sgout = sgin;
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}
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sg_init_table(sgin, nsg);
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sg_set_buf(&sgin[0], ctx->rx_aad_ciphertext, TLS_AAD_SPACE_SIZE);
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nsg = skb_to_sgvec(skb, &sgin[1],
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rxm->offset + tls_ctx->rx.prepend_size,
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rxm->full_len - tls_ctx->rx.prepend_size);
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if (nsg < 0) {
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ret = nsg;
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goto out;
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}
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tls_make_aad(ctx->rx_aad_ciphertext,
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rxm->full_len - tls_ctx->rx.overhead_size,
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tls_ctx->rx.rec_seq,
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tls_ctx->rx.rec_seq_size,
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ctx->control);
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ret = tls_do_decryption(sk, sgin, sgout, iv,
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rxm->full_len - tls_ctx->rx.overhead_size,
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skb, sk->sk_allocation);
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out:
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if (sgin != &sgin_arr[0])
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kfree(sgin);
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return ret;
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return decrypt_internal(sk, skb, NULL, sgout, &chunk, &zc);
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}
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static bool tls_sw_advance_skb(struct sock *sk, struct sk_buff *skb,
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@ -816,43 +888,17 @@ int tls_sw_recvmsg(struct sock *sk,
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}
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if (!ctx->decrypted) {
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int page_count;
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int to_copy;
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page_count = iov_iter_npages(&msg->msg_iter,
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MAX_SKB_FRAGS);
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to_copy = rxm->full_len - tls_ctx->rx.overhead_size;
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if (!is_kvec && to_copy <= len && page_count < MAX_SKB_FRAGS &&
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likely(!(flags & MSG_PEEK))) {
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struct scatterlist sgin[MAX_SKB_FRAGS + 1];
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int pages = 0;
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int to_copy = rxm->full_len - tls_ctx->rx.overhead_size;
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if (!is_kvec && to_copy <= len &&
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likely(!(flags & MSG_PEEK)))
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zc = true;
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sg_init_table(sgin, MAX_SKB_FRAGS + 1);
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sg_set_buf(&sgin[0], ctx->rx_aad_plaintext,
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TLS_AAD_SPACE_SIZE);
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err = zerocopy_from_iter(sk, &msg->msg_iter,
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to_copy, &pages,
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&chunk, &sgin[1],
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MAX_SKB_FRAGS, false);
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if (err < 0)
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goto fallback_to_reg_recv;
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err = decrypt_skb_update(sk, skb, sgin, &zc);
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for (; pages > 0; pages--)
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put_page(sg_page(&sgin[pages]));
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if (err < 0) {
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tls_err_abort(sk, EBADMSG);
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goto recv_end;
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}
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} else {
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fallback_to_reg_recv:
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err = decrypt_skb_update(sk, skb, NULL, &zc);
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if (err < 0) {
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tls_err_abort(sk, EBADMSG);
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goto recv_end;
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}
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err = decrypt_skb_update(sk, skb, &msg->msg_iter,
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&chunk, &zc);
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if (err < 0) {
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tls_err_abort(sk, EBADMSG);
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goto recv_end;
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}
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ctx->decrypted = true;
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}
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@ -903,7 +949,7 @@ ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
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int err = 0;
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long timeo;
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int chunk;
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bool zc;
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bool zc = false;
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lock_sock(sk);
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@ -920,7 +966,7 @@ ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
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}
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if (!ctx->decrypted) {
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err = decrypt_skb_update(sk, skb, NULL, &zc);
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err = decrypt_skb_update(sk, skb, NULL, &chunk, &zc);
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if (err < 0) {
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tls_err_abort(sk, EBADMSG);
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