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cifs: simplify SMB header check routine

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...just cleanup. There should be no behavior change.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Jeff Layton 2011-01-28 15:05:42 -05:00 committed by Steve French
parent 2db7c58155
commit 68abaffa6b
1 changed files with 24 additions and 22 deletions
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46
fs/cifs/misc.c
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@ -381,29 +381,31 @@ header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
}
static int
checkSMBhdr(struct smb_hdr *smb, __u16 mid)
check_smb_hdr(struct smb_hdr *smb, __u16 mid)
{
/* Make sure that this really is an SMB, that it is a response,
and that the message ids match */
if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
(mid == smb->Mid)) {
if (smb->Flags & SMBFLG_RESPONSE)
return 0;
else {
/* only one valid case where server sends us request */
if (smb->Command == SMB_COM_LOCKING_ANDX)
return 0;
else
cERROR(1, "Received Request not response");
}
} else { /* bad signature or mid */
if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
cERROR(1, "Bad protocol string signature header %x",
*(unsigned int *) smb->Protocol);
if (mid != smb->Mid)
cERROR(1, "Mids do not match");
/* does it have the right SMB "signature" ? */
if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
cERROR(1, "Bad protocol string signature header 0x%x",
*(unsigned int *)smb->Protocol);
return 1;
}
cERROR(1, "bad smb detected. The Mid=%d", smb->Mid);
/* Make sure that message ids match */
if (mid != smb->Mid) {
cERROR(1, "Mids do not match. received=%u expected=%u",
smb->Mid, mid);
return 1;
}
/* if it's a response then accept */
if (smb->Flags & SMBFLG_RESPONSE)
return 0;
/* only one valid case where server sends us request */
if (smb->Command == SMB_COM_LOCKING_ANDX)
return 0;
cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
return 1;
}
@ -448,7 +450,7 @@ checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length)
return 1;
}
if (checkSMBhdr(smb, mid))
if (check_smb_hdr(smb, mid))
return 1;
clc_len = smbCalcSize_LE(smb);