CIFS: Separate protocol-specific code from demultiplex code
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5560e1d..cb6e757 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -183,8 +183,9 @@
-EINVAL = invalid transact2
*/
-static int check2ndT2(struct smb_hdr *pSMB)
+static int check2ndT2(char *buf)
{
+ struct smb_hdr *pSMB = (struct smb_hdr *)buf;
struct smb_t2_rsp *pSMBt;
int remaining;
__u16 total_data_size, data_in_this_rsp;
@@ -224,10 +225,10 @@
return remaining;
}
-static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
+static int coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
{
- struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)psecond;
- struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
+ struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
+ struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
char *data_area_of_tgt;
char *data_area_of_src;
int remaining;
@@ -280,23 +281,23 @@
put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
/* fix up the BCC */
- byte_count = get_bcc(pTargetSMB);
+ byte_count = get_bcc(target_hdr);
byte_count += total_in_src;
/* is the result too big for the field? */
if (byte_count > USHRT_MAX) {
cFYI(1, "coalesced BCC too large (%u)", byte_count);
return -EPROTO;
}
- put_bcc(byte_count, pTargetSMB);
+ put_bcc(byte_count, target_hdr);
- byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
+ byte_count = be32_to_cpu(target_hdr->smb_buf_length);
byte_count += total_in_src;
/* don't allow buffer to overflow */
if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
return -ENOBUFS;
}
- pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
+ target_hdr->smb_buf_length = cpu_to_be32(byte_count);
/* copy second buffer into end of first buffer */
memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
@@ -337,6 +338,18 @@
queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
}
+static inline size_t
+header_size(void)
+{
+ return sizeof(struct smb_hdr);
+}
+
+static inline size_t
+max_header_size(void)
+{
+ return MAX_CIFS_HDR_SIZE;
+}
+
static bool
allocate_buffers(struct TCP_Server_Info *server)
{
@@ -350,7 +363,7 @@
}
} else if (server->large_buf) {
/* we are reusing a dirty large buf, clear its start */
- memset(server->bigbuf, 0, sizeof(struct smb_hdr));
+ memset(server->bigbuf, 0, header_size());
}
if (!server->smallbuf) {
@@ -364,7 +377,7 @@
/* beginning of smb buffer is cleared in our buf_get */
} else {
/* if existing small buf clear beginning */
- memset(server->smallbuf, 0, sizeof(struct smb_hdr));
+ memset(server->smallbuf, 0, header_size());
}
return true;
@@ -566,8 +579,9 @@
}
static struct mid_q_entry *
-find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)
+find_mid(struct TCP_Server_Info *server, char *buffer)
{
+ struct smb_hdr *buf = (struct smb_hdr *)buffer;
struct mid_q_entry *mid;
spin_lock(&GlobalMid_Lock);
@@ -600,7 +614,7 @@
static void
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
- struct smb_hdr *buf, int malformed)
+ char *buf, int malformed)
{
if (malformed == 0 && check2ndT2(buf) > 0) {
mid->multiRsp = true;
@@ -731,11 +745,10 @@
{
int length;
char *buf = server->smallbuf;
- struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
- unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
+ unsigned int pdu_length = get_rfc1002_length(buf);
/* make sure this will fit in a large buffer */
- if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
+ if (pdu_length > CIFSMaxBufSize + max_header_size() - 4) {
cERROR(1, "SMB response too long (%u bytes)",
pdu_length);
cifs_reconnect(server);
@@ -746,20 +759,18 @@
/* switch to large buffer if too big for a small one */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
server->large_buf = true;
- memcpy(server->bigbuf, server->smallbuf, server->total_read);
+ memcpy(server->bigbuf, buf, server->total_read);
buf = server->bigbuf;
- smb_buffer = (struct smb_hdr *)buf;
}
/* now read the rest */
- length = cifs_read_from_socket(server,
- buf + sizeof(struct smb_hdr) - 1,
- pdu_length - sizeof(struct smb_hdr) + 1 + 4);
+ length = cifs_read_from_socket(server, buf + header_size() - 1,
+ pdu_length - header_size() + 1 + 4);
if (length < 0)
return length;
server->total_read += length;
- dump_smb(smb_buffer, server->total_read);
+ dump_smb(buf, server->total_read);
/*
* We know that we received enough to get to the MID as we
@@ -770,7 +781,7 @@
* 48 bytes is enough to display the header and a little bit
* into the payload for debugging purposes.
*/
- length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
+ length = checkSMB(buf, server->total_read);
if (length != 0)
cifs_dump_mem("Bad SMB: ", buf,
min_t(unsigned int, server->total_read, 48));
@@ -778,7 +789,7 @@
if (!mid)
return length;
- handle_mid(mid, server, smb_buffer, length);
+ handle_mid(mid, server, buf, length);
return 0;
}
@@ -789,7 +800,6 @@
struct TCP_Server_Info *server = p;
unsigned int pdu_length;
char *buf = NULL;
- struct smb_hdr *smb_buffer = NULL;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mid_entry;
@@ -810,7 +820,6 @@
continue;
server->large_buf = false;
- smb_buffer = (struct smb_hdr *)server->smallbuf;
buf = server->smallbuf;
pdu_length = 4; /* enough to get RFC1001 header */
@@ -823,14 +832,14 @@
* The right amount was read from socket - 4 bytes,
* so we can now interpret the length field.
*/
- pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
+ pdu_length = get_rfc1002_length(buf);
cFYI(1, "RFC1002 header 0x%x", pdu_length);
if (!is_smb_response(server, buf[0]))
continue;
/* make sure we have enough to get to the MID */
- if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) {
+ if (pdu_length < header_size() - 1 - 4) {
cERROR(1, "SMB response too short (%u bytes)",
pdu_length);
cifs_reconnect(server);
@@ -840,12 +849,12 @@
/* read down to the MID */
length = cifs_read_from_socket(server, buf + 4,
- sizeof(struct smb_hdr) - 1 - 4);
+ header_size() - 1 - 4);
if (length < 0)
continue;
server->total_read += length;
- mid_entry = find_mid(server, smb_buffer);
+ mid_entry = find_mid(server, buf);
if (!mid_entry || !mid_entry->receive)
length = standard_receive3(server, mid_entry);
@@ -855,22 +864,19 @@
if (length < 0)
continue;
- if (server->large_buf) {
+ if (server->large_buf)
buf = server->bigbuf;
- smb_buffer = (struct smb_hdr *)buf;
- }
server->lstrp = jiffies;
if (mid_entry != NULL) {
if (!mid_entry->multiRsp || mid_entry->multiEnd)
mid_entry->callback(mid_entry);
- } else if (!is_valid_oplock_break(smb_buffer, server)) {
+ } else if (!is_valid_oplock_break(buf, server)) {
cERROR(1, "No task to wake, unknown frame received! "
"NumMids %d", atomic_read(&midCount));
- cifs_dump_mem("Received Data is: ", buf,
- sizeof(struct smb_hdr));
+ cifs_dump_mem("Received Data is: ", buf, header_size());
#ifdef CONFIG_CIFS_DEBUG2
- cifs_dump_detail(smb_buffer);
+ cifs_dump_detail(buf);
cifs_dump_mids(server);
#endif /* CIFS_DEBUG2 */