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CIFS: Move RFC1002 check to a separate function

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Reviewed-and-Tested-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky 2011-08-01 13:19:42 +04:00 committed by Steve French
parent e7015fb1c5
commit 98bac62c9f
1 changed files with 67 additions and 49 deletions
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116
fs/cifs/connect.c
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@ -416,6 +416,63 @@ read_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg,
return rc;
}
static bool
check_rfc1002_header(struct TCP_Server_Info *server, char *buf)
{
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) {
/*
* 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);
/* give server a second to clean up */
msleep(1000);
/*
* Always try 445 first on reconnect since we get NACK
* on some if we ever connected to port 139 (the NACK
* is since we do not begin with RFC1001 session
* initialize frame).
*/
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);
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;
}
static int
cifs_demultiplex_thread(void *p)
{
@ -429,7 +486,6 @@ cifs_demultiplex_thread(void *p)
struct list_head *tmp, *tmp2;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mid_entry;
char temp;
bool isLargeBuf = false;
bool isMultiRsp;
int rc;
@ -482,59 +538,21 @@ incomplete_rcv:
else if (rc == 1)
continue;
/* The right amount was read from socket - 4 bytes */
/* so we can now interpret the length field */
/*
* The right amount was read from socket - 4 bytes,
* so we can now interpret the length field.
*/
/* 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 */
temp = *buf;
/* Note that FC 1001 length is big endian on the wire,
but we convert it here so it is always manipulated
as host byte order */
/*
* Note that RFC 1001 length is big endian on the wire,
* but we convert it here so it is always manipulated
* as host byte order.
*/
pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
if (!check_rfc1002_header(server, buf))
continue;
} else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
cFYI(1, "Good RFC 1002 session rsp");
continue;
} else if (temp == (char)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);
/* give server a second to clean up */
msleep(1000);
/* always try 445 first on reconnect since we get NACK
* on some if we ever connected to port 139 (the NACK
* is since we do not begin with RFC1001 session
* initialize frame)
*/
cifs_set_port((struct sockaddr *)
&server->dstaddr, CIFS_PORT);
cifs_reconnect(server);
wake_up(&server->response_q);
continue;
} else if (temp != (char) 0) {
cERROR(1, "Unknown RFC 1002 frame");
cifs_dump_mem(" Received Data: ", buf, length);
cifs_reconnect(server);
continue;
}
/* 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",
length, pdu_length+4);
cifs_reconnect(server);
wake_up(&server->response_q);
continue;
}
/* else length ok */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {