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cifs: clean up check_rfc1002_header 

Rename it for better clarity as to what it does and have the caller pass
in just the single type byte. Turn the if statement into a switch and
optimize it by placing the most common message type at the top. Move the
header length check back into cifs_demultiplex_thread in preparation
for adding a new receive phase and normalize the cFYI messages.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2011-10-11 06:41:32 -04:00 committed by Steve French
parent 03776f4516
commit fe11e4ccb8
1 changed files with 30 additions and 33 deletions
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63
fs/cifs/connect.c
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@ -427,29 +427,29 @@ read_from_socket(struct TCP_Server_Info *server, char *buf,
}
static bool
check_rfc1002_header(struct TCP_Server_Info *server, char *buf)
is_smb_response(struct TCP_Server_Info *server, unsigned char type)
{
char temp = *buf;
unsigned int pdu_length = be32_to_cpu(
((struct smb_hdr *)buf)->smb_buf_length);
/*
* The first byte big endian of the length field,
* is actually not part of the length but the type
* with the most common, zero, as regular data.
*/
if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
return false;
} else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
cFYI(1, "Good RFC 1002 session rsp");
return false;
} else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
switch (type) {
case RFC1002_SESSION_MESSAGE:
/* Regular SMB response */
return true;
case RFC1002_SESSION_KEEP_ALIVE:
cFYI(1, "RFC 1002 session keep alive");
break;
case RFC1002_POSITIVE_SESSION_RESPONSE:
cFYI(1, "RFC 1002 positive session response");
break;
case RFC1002_NEGATIVE_SESSION_RESPONSE:
/*
* We get this from Windows 98 instead of an error on
* SMB negprot response.
*/
cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
pdu_length);
cFYI(1, "RFC 1002 negative session response");
/* give server a second to clean up */
msleep(1000);
/*
@ -458,29 +458,16 @@ check_rfc1002_header(struct TCP_Server_Info *server, char *buf)
* is since we do not begin with RFC1001 session
* initialize frame).
*/
cifs_set_port((struct sockaddr *)
&server->dstaddr, CIFS_PORT);
cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
cifs_reconnect(server);
wake_up(&server->response_q);
return false;
} else if (temp != (char) 0) {
cERROR(1, "Unknown RFC 1002 frame");
cifs_dump_mem(" Received Data: ", buf, 4);
break;
default:
cERROR(1, "RFC 1002 unknown response type 0x%x", type);
cifs_reconnect(server);
return false;
}
/* else we have an SMB response */
if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
(pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
cERROR(1, "Invalid size SMB length %d pdu_length %d",
4, pdu_length+4);
cifs_reconnect(server);
wake_up(&server->response_q);
return false;
}
return true;
return false;
}
static struct mid_q_entry *
@ -683,10 +670,20 @@ cifs_demultiplex_thread(void *p)
*/
pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
if (!check_rfc1002_header(server, buf))
cFYI(1, "RFC1002 header 0x%x", pdu_length);
if (!is_smb_response(server, buf[0]))
continue;
/* check the length */
if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
(pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
cERROR(1, "Invalid size SMB length %d pdu_length %d",
4, pdu_length + 4);
cifs_reconnect(server);
wake_up(&server->response_q);
continue;
}
/* else length ok */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
isLargeBuf = true;