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net/tls: optimize judgement processes in tls_set_device_offload()

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It is known that priority setting HW offload when set tls TX/RX offload
by setsockopt(). Check netdevice whether support NETIF_F_HW_TLS_TX or
not at the later stages in the whole tls_set_device_offload() process,
some memory allocations have been done before that. We must release those
memory and return error if we judge the netdevice not support
NETIF_F_HW_TLS_TX. It is redundant.

Move NETIF_F_HW_TLS_TX judgement forward, and move start_marker_record
and offload_ctx memory allocation back slightly. Thus, we can get
simpler exception handling process.

Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ziyang Xuan 2022-03-19 11:15:20 +08:00 committed by Jakub Kicinski
parent 1ddcbfbf9d
commit b1a6f56b65
1 changed files with 31 additions and 31 deletions
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62
net/tls/tls_device.c
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@ -1028,20 +1028,21 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
if (ctx->priv_ctx_tx)
return -EEXIST;
start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
if (!start_marker_record)
return -ENOMEM;
netdev = get_netdev_for_sock(sk);
if (!netdev) {
pr_err_ratelimited("%s: netdev not found\n", __func__);
return -EINVAL;
}
offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
if (!offload_ctx) {
rc = -ENOMEM;
goto free_marker_record;
if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
rc = -EOPNOTSUPP;
goto release_netdev;
}
crypto_info = &ctx->crypto_send.info;
if (crypto_info->version != TLS_1_2_VERSION) {
rc = -EOPNOTSUPP;
goto free_offload_ctx;
goto release_netdev;
}
switch (crypto_info->cipher_type) {
@ -1057,13 +1058,13 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
break;
default:
rc = -EINVAL;
goto free_offload_ctx;
goto release_netdev;
}
/* Sanity-check the rec_seq_size for stack allocations */
if (rec_seq_size > TLS_MAX_REC_SEQ_SIZE) {
rc = -EINVAL;
goto free_offload_ctx;
goto release_netdev;
}
prot->version = crypto_info->version;
@ -1077,7 +1078,7 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
GFP_KERNEL);
if (!ctx->tx.iv) {
rc = -ENOMEM;
goto free_offload_ctx;
goto release_netdev;
}
memcpy(ctx->tx.iv + TLS_CIPHER_AES_GCM_128_SALT_SIZE, iv, iv_size);
@ -1089,9 +1090,21 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
goto free_iv;
}
start_marker_record = kmalloc(sizeof(*start_marker_record), GFP_KERNEL);
if (!start_marker_record) {
rc = -ENOMEM;
goto free_rec_seq;
}
offload_ctx = kzalloc(TLS_OFFLOAD_CONTEXT_SIZE_TX, GFP_KERNEL);
if (!offload_ctx) {
rc = -ENOMEM;
goto free_marker_record;
}
rc = tls_sw_fallback_init(sk, offload_ctx, crypto_info);
if (rc)
goto free_rec_seq;
goto free_offload_ctx;
/* start at rec_seq - 1 to account for the start marker record */
memcpy(&rcd_sn, ctx->tx.rec_seq, sizeof(rcd_sn));
@ -1118,18 +1131,6 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
if (skb)
TCP_SKB_CB(skb)->eor = 1;
netdev = get_netdev_for_sock(sk);
if (!netdev) {
pr_err_ratelimited("%s: netdev not found\n", __func__);
rc = -EINVAL;
goto disable_cad;
}
if (!(netdev->features & NETIF_F_HW_TLS_TX)) {
rc = -EOPNOTSUPP;
goto release_netdev;
}
/* Avoid offloading if the device is down
* We don't want to offload new flows after
* the NETDEV_DOWN event
@ -1167,20 +1168,19 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx)
release_lock:
up_read(&device_offload_lock);
release_netdev:
dev_put(netdev);
disable_cad:
clean_acked_data_disable(inet_csk(sk));
crypto_free_aead(offload_ctx->aead_send);
free_rec_seq:
kfree(ctx->tx.rec_seq);
free_iv:
kfree(ctx->tx.iv);
free_offload_ctx:
kfree(offload_ctx);
ctx->priv_ctx_tx = NULL;
free_marker_record:
kfree(start_marker_record);
free_rec_seq:
kfree(ctx->tx.rec_seq);
free_iv:
kfree(ctx->tx.iv);
release_netdev:
dev_put(netdev);
return rc;
}