Merge branch 'support-256-bit-tls-keys-with-device-offload'

Gal Pressman says:

====================
Support 256 bit TLS keys with device offload

This series adds support for 256 bit TLS keys with device offload, and a
cleanup patch to remove repeating code:
- Patches #1-2 add cipher sizes descriptors which allow reducing the
  amount of code duplications.
- Patch #3 allows 256 bit keys to be TX offloaded in the tls module (RX
  already supported).
- Patch #4 adds 256 bit keys support to the mlx5 driver.
====================

Link: https://lore.kernel.org/r/20220920130150.3546-1-gal@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls.h

@@ -25,7 +25,8 @@ static inline bool mlx5e_is_ktls_device(struct mlx5_core_dev *mdev)
 	if (!MLX5_CAP_GEN(mdev, log_max_dek))
 		return false;
 
-	return MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_128);
+	return (MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_128) ||
+		MLX5_CAP_TLS(mdev, tls_1_2_aes_gcm_256));
 }
 
 static inline bool mlx5e_ktls_type_check(struct mlx5_core_dev *mdev,
@@ -36,6 +37,10 @@ static inline bool mlx5e_ktls_type_check(struct mlx5_core_dev *mdev,
 		if (crypto_info->version == TLS_1_2_VERSION)
 			return MLX5_CAP_TLS(mdev,  tls_1_2_aes_gcm_128);
 		break;
+	case TLS_CIPHER_AES_GCM_256:
+		if (crypto_info->version == TLS_1_2_VERSION)
+			return MLX5_CAP_TLS(mdev,  tls_1_2_aes_gcm_256);
+		break;
 	}
 
 	return false;

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c

@@ -43,7 +43,7 @@ struct mlx5e_ktls_rx_resync_ctx {
 };
 
 struct mlx5e_ktls_offload_context_rx {
-	struct tls12_crypto_info_aes_gcm_128 crypto_info;
+	union mlx5e_crypto_info crypto_info;
 	struct accel_rule rule;
 	struct sock *sk;
 	struct mlx5e_rq_stats *rq_stats;
@@ -362,7 +362,6 @@ static void resync_init(struct mlx5e_ktls_rx_resync_ctx *resync,
 static void resync_handle_seq_match(struct mlx5e_ktls_offload_context_rx *priv_rx,
 				    struct mlx5e_channel *c)
 {
-	struct tls12_crypto_info_aes_gcm_128 *info = &priv_rx->crypto_info;
 	struct mlx5e_ktls_resync_resp *ktls_resync;
 	struct mlx5e_icosq *sq;
 	bool trigger_poll;
@@ -373,7 +372,31 @@ static void resync_handle_seq_match(struct mlx5e_ktls_offload_context_rx *priv_r
 
 	spin_lock_bh(&ktls_resync->lock);
 	spin_lock_bh(&priv_rx->lock);
-	memcpy(info->rec_seq, &priv_rx->resync.sw_rcd_sn_be, sizeof(info->rec_seq));
+	switch (priv_rx->crypto_info.crypto_info.cipher_type) {
+	case TLS_CIPHER_AES_GCM_128: {
+		struct tls12_crypto_info_aes_gcm_128 *info =
+			&priv_rx->crypto_info.crypto_info_128;
+
+		memcpy(info->rec_seq, &priv_rx->resync.sw_rcd_sn_be,
+		       sizeof(info->rec_seq));
+		break;
+	}
+	case TLS_CIPHER_AES_GCM_256: {
+		struct tls12_crypto_info_aes_gcm_256 *info =
+			&priv_rx->crypto_info.crypto_info_256;
+
+		memcpy(info->rec_seq, &priv_rx->resync.sw_rcd_sn_be,
+		       sizeof(info->rec_seq));
+		break;
+	}
+	default:
+		WARN_ONCE(1, "Unsupported cipher type %u\n",
+			  priv_rx->crypto_info.crypto_info.cipher_type);
+		spin_unlock_bh(&priv_rx->lock);
+		spin_unlock_bh(&ktls_resync->lock);
+		return;
+	}
+
 	if (list_empty(&priv_rx->list)) {
 		list_add_tail(&priv_rx->list, &ktls_resync->list);
 		trigger_poll = !test_and_set_bit(MLX5E_SQ_STATE_PENDING_TLS_RX_RESYNC, &sq->state);
@@ -604,8 +627,20 @@ int mlx5e_ktls_add_rx(struct net_device *netdev, struct sock *sk,
 
 	INIT_LIST_HEAD(&priv_rx->list);
 	spin_lock_init(&priv_rx->lock);
-	priv_rx->crypto_info  =
-		*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
+	switch (crypto_info->cipher_type) {
+	case TLS_CIPHER_AES_GCM_128:
+		priv_rx->crypto_info.crypto_info_128 =
+			*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
+		break;
+	case TLS_CIPHER_AES_GCM_256:
+		priv_rx->crypto_info.crypto_info_256 =
+			*(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
+		break;
+	default:
+		WARN_ONCE(1, "Unsupported cipher type %u\n",
+			  crypto_info->cipher_type);
+		return -EOPNOTSUPP;
+	}
 
 	rxq = mlx5e_ktls_sk_get_rxq(sk);
 	priv_rx->rxq = rxq;

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c

@@ -93,7 +93,7 @@ struct mlx5e_ktls_offload_context_tx {
 	bool ctx_post_pending;
 	/* control / resync */
 	struct list_head list_node; /* member of the pool */
-	struct tls12_crypto_info_aes_gcm_128 crypto_info;
+	union mlx5e_crypto_info crypto_info;
 	struct tls_offload_context_tx *tx_ctx;
 	struct mlx5_core_dev *mdev;
 	struct mlx5e_tls_sw_stats *sw_stats;
@@ -485,8 +485,20 @@ int mlx5e_ktls_add_tx(struct net_device *netdev, struct sock *sk,
 		goto err_create_key;
 
 	priv_tx->expected_seq = start_offload_tcp_sn;
-	priv_tx->crypto_info  =
-		*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
+	switch (crypto_info->cipher_type) {
+	case TLS_CIPHER_AES_GCM_128:
+		priv_tx->crypto_info.crypto_info_128 =
+			*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
+		break;
+	case TLS_CIPHER_AES_GCM_256:
+		priv_tx->crypto_info.crypto_info_256 =
+			*(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
+		break;
+	default:
+		WARN_ONCE(1, "Unsupported cipher type %u\n",
+			  crypto_info->cipher_type);
+		return -EOPNOTSUPP;
+	}
 	priv_tx->tx_ctx = tls_offload_ctx_tx(tls_ctx);
 
 	mlx5e_set_ktls_tx_priv_ctx(tls_ctx, priv_tx);
@@ -671,14 +683,31 @@ tx_post_resync_params(struct mlx5e_txqsq *sq,
 		      struct mlx5e_ktls_offload_context_tx *priv_tx,
 		      u64 rcd_sn)
 {
-	struct tls12_crypto_info_aes_gcm_128 *info = &priv_tx->crypto_info;
 	__be64 rn_be = cpu_to_be64(rcd_sn);
 	bool skip_static_post;
 	u16 rec_seq_sz;
 	char *rec_seq;
 
-	rec_seq = info->rec_seq;
-	rec_seq_sz = sizeof(info->rec_seq);
+	switch (priv_tx->crypto_info.crypto_info.cipher_type) {
+	case TLS_CIPHER_AES_GCM_128: {
+		struct tls12_crypto_info_aes_gcm_128 *info = &priv_tx->crypto_info.crypto_info_128;
+
+		rec_seq = info->rec_seq;
+		rec_seq_sz = sizeof(info->rec_seq);
+		break;
+	}
+	case TLS_CIPHER_AES_GCM_256: {
+		struct tls12_crypto_info_aes_gcm_256 *info = &priv_tx->crypto_info.crypto_info_256;
+
+		rec_seq = info->rec_seq;
+		rec_seq_sz = sizeof(info->rec_seq);
+		break;
+	}
+	default:
+		WARN_ONCE(1, "Unsupported cipher type %u\n",
+			  priv_tx->crypto_info.crypto_info.cipher_type);
+		return;
+	}
 
 	skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
 	if (!skip_static_post)

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_txrx.c

@@ -21,7 +21,7 @@ enum {
 
 static void
 fill_static_params(struct mlx5_wqe_tls_static_params_seg *params,
-		   struct tls12_crypto_info_aes_gcm_128 *info,
+		   union mlx5e_crypto_info *crypto_info,
 		   u32 key_id, u32 resync_tcp_sn)
 {
 	char *initial_rn, *gcm_iv;
@@ -32,7 +32,26 @@ fill_static_params(struct mlx5_wqe_tls_static_params_seg *params,
 
 	ctx = params->ctx;
 
-	EXTRACT_INFO_FIELDS;
+	switch (crypto_info->crypto_info.cipher_type) {
+	case TLS_CIPHER_AES_GCM_128: {
+		struct tls12_crypto_info_aes_gcm_128 *info =
+			&crypto_info->crypto_info_128;
+
+		EXTRACT_INFO_FIELDS;
+		break;
+	}
+	case TLS_CIPHER_AES_GCM_256: {
+		struct tls12_crypto_info_aes_gcm_256 *info =
+			&crypto_info->crypto_info_256;
+
+		EXTRACT_INFO_FIELDS;
+		break;
+	}
+	default:
+		WARN_ONCE(1, "Unsupported cipher type %u\n",
+			  crypto_info->crypto_info.cipher_type);
+		return;
+	}
 
 	gcm_iv      = MLX5_ADDR_OF(tls_static_params, ctx, gcm_iv);
 	initial_rn  = MLX5_ADDR_OF(tls_static_params, ctx, initial_record_number);
@@ -54,7 +73,7 @@ fill_static_params(struct mlx5_wqe_tls_static_params_seg *params,
 void
 mlx5e_ktls_build_static_params(struct mlx5e_set_tls_static_params_wqe *wqe,
 			       u16 pc, u32 sqn,
-			       struct tls12_crypto_info_aes_gcm_128 *info,
+			       union mlx5e_crypto_info *crypto_info,
 			       u32 tis_tir_num, u32 key_id, u32 resync_tcp_sn,
 			       bool fence, enum tls_offload_ctx_dir direction)
 {
@@ -75,7 +94,7 @@ mlx5e_ktls_build_static_params(struct mlx5e_set_tls_static_params_wqe *wqe,
 	ucseg->flags = MLX5_UMR_INLINE;
 	ucseg->bsf_octowords = cpu_to_be16(MLX5_ST_SZ_BYTES(tls_static_params) / 16);
 
-	fill_static_params(&wqe->params, info, key_id, resync_tcp_sn);
+	fill_static_params(&wqe->params, crypto_info, key_id, resync_tcp_sn);
 }
 
 static void

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_utils.h

@@ -27,6 +27,12 @@ int mlx5e_ktls_add_rx(struct net_device *netdev, struct sock *sk,
 void mlx5e_ktls_del_rx(struct net_device *netdev, struct tls_context *tls_ctx);
 void mlx5e_ktls_rx_resync(struct net_device *netdev, struct sock *sk, u32 seq, u8 *rcd_sn);
 
+union mlx5e_crypto_info {
+	struct tls_crypto_info crypto_info;
+	struct tls12_crypto_info_aes_gcm_128 crypto_info_128;
+	struct tls12_crypto_info_aes_gcm_256 crypto_info_256;
+};
+
 struct mlx5e_set_tls_static_params_wqe {
 	struct mlx5_wqe_ctrl_seg ctrl;
 	struct mlx5_wqe_umr_ctrl_seg uctrl;
@@ -72,7 +78,7 @@ struct mlx5e_get_tls_progress_params_wqe {
 void
 mlx5e_ktls_build_static_params(struct mlx5e_set_tls_static_params_wqe *wqe,
 			       u16 pc, u32 sqn,
-			       struct tls12_crypto_info_aes_gcm_128 *info,
+			       union mlx5e_crypto_info *crypto_info,
 			       u32 tis_tir_num, u32 key_id, u32 resync_tcp_sn,
 			       bool fence, enum tls_offload_ctx_dir direction);
 void

include/net/tls.h

@@ -51,6 +51,16 @@
 
 struct tls_rec;
 
+struct tls_cipher_size_desc {
+	unsigned int iv;
+	unsigned int key;
+	unsigned int salt;
+	unsigned int tag;
+	unsigned int rec_seq;
+};
+
+extern const struct tls_cipher_size_desc tls_cipher_size_desc[];
+
 /* Maximum data size carried in a TLS record */
 #define TLS_MAX_PAYLOAD_SIZE		((size_t)1 << 14)
 

net/tls/tls_device.c

@@ -902,17 +902,28 @@ 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:
+	case TLS_CIPHER_AES_GCM_256:
+		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;
@@ -927,10 +938,8 @@ 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;
 
@@ -941,7 +950,7 @@ 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);
@@ -1024,7 +1033,7 @@ 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
@@ -1041,7 +1050,7 @@ 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,
@@ -1062,9 +1071,9 @@ 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;
@@ -1099,44 +1108,44 @@ 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;
+	case TLS_CIPHER_AES_GCM_256:
+		iv = ((struct tls12_crypto_info_aes_gcm_256 *)crypto_info)->iv;
+		rec_seq =
+		 ((struct tls12_crypto_info_aes_gcm_256 *)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;

net/tls/tls_device_fallback.c

@@ -54,13 +54,25 @@ 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:
+	case TLS_CIPHER_AES_GCM_256:
+		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);
@@ -73,13 +85,11 @@ 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));
@@ -90,7 +100,7 @@ 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
@@ -111,7 +121,7 @@ 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);
@@ -299,11 +309,14 @@ 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,
@@ -315,7 +328,8 @@ 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;
@@ -324,20 +338,26 @@ 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;
+	case TLS_CIPHER_AES_GCM_256:
+		salt = tls_ctx->crypto_send.aes_gcm_256.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);
@@ -451,6 +471,7 @@ 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;
 
@@ -463,15 +484,23 @@ 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;
+	case TLS_CIPHER_AES_GCM_256:
+		key = ((struct tls12_crypto_info_aes_gcm_256 *)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;
 

net/tls/tls_main.c

@@ -58,6 +58,23 @@ enum {
 	TLS_NUM_PROTS,
 };
 
+#define CIPHER_SIZE_DESC(cipher) [cipher] = { \
+	.iv = cipher ## _IV_SIZE, \
+	.key = cipher ## _KEY_SIZE, \
+	.salt = cipher ## _SALT_SIZE, \
+	.tag = cipher ## _TAG_SIZE, \
+	.rec_seq = cipher ## _REC_SEQ_SIZE, \
+}
+
+const struct tls_cipher_size_desc tls_cipher_size_desc[] = {
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_128),
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_GCM_256),
+	CIPHER_SIZE_DESC(TLS_CIPHER_AES_CCM_128),
+	CIPHER_SIZE_DESC(TLS_CIPHER_CHACHA20_POLY1305),
+	CIPHER_SIZE_DESC(TLS_CIPHER_SM4_GCM),
+	CIPHER_SIZE_DESC(TLS_CIPHER_SM4_CCM),
+};
+
 static const struct proto *saved_tcpv6_prot;
 static DEFINE_MUTEX(tcpv6_prot_mutex);
 static const struct proto *saved_tcpv4_prot;