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cifs: Make big endian multiplex ID sequences monotonic on the wire

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The multiplex identifier (MID) in the SMB header is only
ever used by the client, in conjunction with PID, to match responses
from the server. As such, the endianess of the MID is not important.
However, When tracing packet sequences on the wire, protocol analyzers
such as wireshark display MID as little endian. It is much more informative
for the on-the-wire MID sequences to match debug information emitted by the
CIFS driver.  Therefore, one should write and read MID in the SMB header
assuming it is always little endian.

Observed from wireshark during the protocol negotiation
and session setup:

        Multiplex ID: 256
        Multiplex ID: 256
        Multiplex ID: 512
        Multiplex ID: 512
        Multiplex ID: 768
        Multiplex ID: 768

After this patch on-the-wire MID values begin at 1 and increase monotonically.

Introduce get_next_mid64() for the internal consumers that use the full 64 bit
multiplex identifier.

Introduce the helpers get_mid() and compare_mid() to make the endian
translation clear.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Tim Gardner <timg@tpi.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Tim Gardner 2013-11-02 12:50:34 -05:00 committed by Steve French
parent 944d6f1a5b
commit 3d378d3fd8
6 changed files with 35 additions and 10 deletions
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25
fs/cifs/cifsglob.h
View File

@ -622,11 +622,34 @@ set_credits(struct TCP_Server_Info *server, const int val)
}
static inline __u64
get_next_mid(struct TCP_Server_Info *server)
get_next_mid64(struct TCP_Server_Info *server)
{
return server->ops->get_next_mid(server);
}
static inline __le16
get_next_mid(struct TCP_Server_Info *server)
{
__u16 mid = get_next_mid64(server);
/*
* The value in the SMB header should be little endian for easy
* on-the-wire decoding.
*/
return cpu_to_le16(mid);
}
static inline __u16
get_mid(const struct smb_hdr *smb)
{
return le16_to_cpu(smb->Mid);
}
static inline bool
compare_mid(__u16 mid, const struct smb_hdr *smb)
{
return mid == le16_to_cpu(smb->Mid);
}
/*
* When the server supports very large reads and writes via POSIX extensions,
* we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not

2
fs/cifs/cifspdu.h
View File

@ -428,7 +428,7 @@ struct smb_hdr {
__u16 Tid;
__le16 Pid;
__u16 Uid;
__u16 Mid;
__le16 Mid;
__u8 WordCount;
} __attribute__((packed));

10
fs/cifs/misc.c
View File

@ -295,7 +295,8 @@ check_smb_hdr(struct smb_hdr *smb)
if (smb->Command == SMB_COM_LOCKING_ANDX)
return 0;
cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", smb->Mid);
cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
get_mid(smb));
return 1;
}
@ -351,6 +352,7 @@ checkSMB(char *buf, unsigned int total_read)
}
if (4 + rfclen != clc_len) {
__u16 mid = get_mid(smb);
/* check if bcc wrapped around for large read responses */
if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
/* check if lengths match mod 64K */
@ -358,11 +360,11 @@ checkSMB(char *buf, unsigned int total_read)
return 0; /* bcc wrapped */
}
cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n",
clc_len, 4 + rfclen, smb->Mid);
clc_len, 4 + rfclen, mid);
if (4 + rfclen < clc_len) {
cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n",
rfclen, smb->Mid);
rfclen, mid);
return -EIO;
} else if (rfclen > clc_len + 512) {
/*
@ -375,7 +377,7 @@ checkSMB(char *buf, unsigned int total_read)
* data to 512 bytes.
*/
cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n",
rfclen, smb->Mid);
rfclen, mid);
return -EIO;
}
}

4
fs/cifs/smb1ops.c
View File

@ -67,7 +67,7 @@ send_nt_cancel(struct TCP_Server_Info *server, void *buf,
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",
in_buf->Mid, rc);
get_mid(in_buf), rc);
return rc;
}
@ -101,7 +101,7 @@ cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
spin_lock(&GlobalMid_Lock);
list_for_each_entry(mid, &server->pending_mid_q, qhead) {
if (mid->mid == buf->Mid &&
if (compare_mid(mid->mid, buf) &&
mid->mid_state == MID_REQUEST_SUBMITTED &&
le16_to_cpu(mid->command) == buf->Command) {
spin_unlock(&GlobalMid_Lock);

2
fs/cifs/smb2transport.c
View File

@ -466,7 +466,7 @@ smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
static inline void
smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr)
{
hdr->MessageId = get_next_mid(server);
hdr->MessageId = get_next_mid64(server);
}
static struct mid_q_entry *

2
fs/cifs/transport.c
View File

@ -58,7 +58,7 @@ AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
return temp;
else {
memset(temp, 0, sizeof(struct mid_q_entry));
temp->mid = smb_buffer->Mid; /* always LE */
temp->mid = get_mid(smb_buffer);
temp->pid = current->pid;
temp->command = cpu_to_le16(smb_buffer->Command);
cifs_dbg(FYI, "For smb_command %d\n", smb_buffer->Command);