From 3524dd4d5f1fb9e75fdfaf280822a34fa82059bd Mon Sep 17 00:00:00 2001 From: Sabrina Dubroca Date: Fri, 25 Aug 2023 23:35:15 +0200 Subject: [PATCH] tls: expand use of tls_cipher_desc in tls_set_device_offload tls_set_device_offload is already getting iv and rec_seq sizes from tls_cipher_desc. We can now also check if the cipher_type coming from userspace is valid and can be offloaded. We can also remove the runtime check on rec_seq, since we validate it at compile time. Signed-off-by: Sabrina Dubroca Link: https://lore.kernel.org/r/8ab71b8eca856c7aaf981a45fe91ac649eb0e2e9.1692977948.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski --- net/tls/tls_device.c | 22 ++++------------------ 1 file changed, 4 insertions(+), 18 deletions(-) diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index 98885d872d4c..8c94c926606a 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -1079,29 +1079,15 @@ int tls_set_device_offload(struct sock *sk, struct tls_context *ctx) goto release_netdev; } - switch (crypto_info->cipher_type) { - case TLS_CIPHER_AES_GCM_128: - iv = ((struct tls12_crypto_info_aes_gcm_128 *)crypto_info)->iv; - 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_desc = get_cipher_desc(crypto_info->cipher_type); - - /* Sanity-check the rec_seq_size for stack allocations */ - if (cipher_desc->rec_seq > TLS_MAX_REC_SEQ_SIZE) { + if (!cipher_desc || !cipher_desc->offloadable) { rc = -EINVAL; goto release_netdev; } + iv = crypto_info_iv(crypto_info, cipher_desc); + rec_seq = crypto_info_rec_seq(crypto_info, cipher_desc); + prot->version = crypto_info->version; prot->cipher_type = crypto_info->cipher_type; prot->prepend_size = TLS_HEADER_SIZE + cipher_desc->iv; -- 2.25.1