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smb: client: show negotiated cipher in DebugData

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Print the negotiated encryption cipher type in DebugData

Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Acked-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Bharath SM 2025-09-02 15:28:57 +05:30 committed by Steve French
parent 72595cb6da
commit 91be128b49
1 changed files with 22 additions and 5 deletions
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27
fs/smb/client/cifs_debug.c
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@ -347,6 +347,22 @@ static __always_inline const char *compression_alg_str(__le16 alg)
}
}
static __always_inline const char *cipher_alg_str(__le16 cipher)
{
switch (cipher) {
case SMB2_ENCRYPTION_AES128_CCM:
return "AES128-CCM";
case SMB2_ENCRYPTION_AES128_GCM:
return "AES128-GCM";
case SMB2_ENCRYPTION_AES256_CCM:
return "AES256-CCM";
case SMB2_ENCRYPTION_AES256_GCM:
return "AES256-GCM";
default:
return "UNKNOWN";
}
}
static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
{
struct mid_q_entry *mid_entry;
@ -539,6 +555,11 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
else
seq_puts(m, "disabled (not supported by this server)");
/* Show negotiated encryption cipher, even if not required */
seq_puts(m, "\nEncryption: ");
if (server->cipher_type)
seq_printf(m, "Negotiated cipher (%s)", cipher_alg_str(server->cipher_type));
seq_printf(m, "\n\n\tSessions: ");
i = 0;
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
@ -576,12 +597,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
/* dump session id helpful for use with network trace */
seq_printf(m, " SessionId: 0x%llx", ses->Suid);
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
seq_puts(m, " encrypted");
/* can help in debugging to show encryption type */
if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
seq_puts(m, "(gcm256)");
}
if (ses->sign)
seq_puts(m, " signed");