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smb3: add dynamic trace point for session setup key expired failures

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There are cases where services need to remount (or change their
credentials files) when keys have expired, but it can be helpful
to have a dynamic trace point to make it easier to notify the
service to refresh the storage account key.

Here is sample output, one from mount with bad password, one
from a reconnect where the password has been changed or expired
and reconnect fails (requiring remount with new storage account key)

       TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
          | |         |   |||||     |         |

  mount.cifs-11362  [000] .....  6000.241620: smb3_key_expired:
    rc=-13 user=testpassu conn_id=0x2 server=localhost addr=127.0.0.1:445
  kworker/4:0-8458  [004] .....  6044.892283: smb3_key_expired:
    rc=-13 user=testpassu conn_id=0x3 server=localhost addr=127.0.0.1:445

Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2024-07-26 01:06:20 -05:00
parent 6629f87b97
commit b6f6a7aa68
2 changed files with 47 additions and 1 deletions
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8
fs/smb/client/smb2pdu.c
View File

@ -1562,8 +1562,14 @@ SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
cifs_small_buf_release(sess_data->iov[0].iov_base);
if (rc == 0)
sess_data->ses->expired_pwd = false;
else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED))
else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
if (sess_data->ses->expired_pwd == false)
trace_smb3_key_expired(sess_data->server->hostname,
sess_data->ses->user_name,
sess_data->server->conn_id,
&sess_data->server->dstaddr, rc);
sess_data->ses->expired_pwd = true;
}
memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));

40
fs/smb/client/trace.h
View File

@ -1281,6 +1281,46 @@ DEFINE_EVENT(smb3_connect_err_class, smb3_##name, \
DEFINE_SMB3_CONNECT_ERR_EVENT(connect_err);
DECLARE_EVENT_CLASS(smb3_sess_setup_err_class,
TP_PROTO(char *hostname, char *username, __u64 conn_id,
const struct __kernel_sockaddr_storage *dst_addr, int rc),
TP_ARGS(hostname, username, conn_id, dst_addr, rc),
TP_STRUCT__entry(
__string(hostname, hostname)
__string(username, username)
__field(__u64, conn_id)
__array(__u8, dst_addr, sizeof(struct sockaddr_storage))
__field(int, rc)
),
TP_fast_assign(
struct sockaddr_storage *pss = NULL;
__entry->conn_id = conn_id;
__entry->rc = rc;
pss = (struct sockaddr_storage *)__entry->dst_addr;
*pss = *dst_addr;
__assign_str(hostname);
__assign_str(username);
),
TP_printk("rc=%d user=%s conn_id=0x%llx server=%s addr=%pISpsfc",
__entry->rc,
__get_str(username),
__entry->conn_id,
__get_str(hostname),
__entry->dst_addr)
)
#define DEFINE_SMB3_SES_SETUP_ERR_EVENT(name) \
DEFINE_EVENT(smb3_sess_setup_err_class, smb3_##name, \
TP_PROTO(char *hostname, \
char *username, \
__u64 conn_id, \
const struct __kernel_sockaddr_storage *addr, \
int rc), \
TP_ARGS(hostname, username, conn_id, addr, rc))
DEFINE_SMB3_SES_SETUP_ERR_EVENT(key_expired);
DECLARE_EVENT_CLASS(smb3_reconnect_class,
TP_PROTO(__u64 currmid,
__u64 conn_id,