return mid;
}
-/*
- return codes:
- 0 not a transact2, or all data present
- >0 transact2 with that much data missing
- -EINVAL invalid transact2
- */
-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;
-
- if (pSMB->Command != SMB_COM_TRANSACTION2)
- return 0;
-
- /* check for plausible wct, bcc and t2 data and parm sizes */
- /* check for parm and data offset going beyond end of smb */
- if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
- cifs_dbg(FYI, "Invalid transact2 word count\n");
- return -EINVAL;
- }
-
- pSMBt = (struct smb_t2_rsp *)pSMB;
-
- total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
- data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
-
- if (total_data_size == data_in_this_rsp)
- return 0;
- else if (total_data_size < data_in_this_rsp) {
- cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
- total_data_size, data_in_this_rsp);
- return -EINVAL;
- }
-
- remaining = total_data_size - data_in_this_rsp;
-
- cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
- remaining);
- if (total_data_size > CIFSMaxBufSize) {
- cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
- total_data_size, CIFSMaxBufSize);
- return -EINVAL;
- }
- return remaining;
-}
-
-static int
-coalesce_t2(char *second_buf, struct smb_hdr *target_hdr, unsigned int *pdu_len)
-{
- 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;
- unsigned int byte_count, total_in_tgt;
- __u16 tgt_total_cnt, src_total_cnt, total_in_src;
-
- src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
- tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
-
- if (tgt_total_cnt != src_total_cnt)
- cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
- src_total_cnt, tgt_total_cnt);
-
- total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
-
- remaining = tgt_total_cnt - total_in_tgt;
-
- if (remaining < 0) {
- cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",
- tgt_total_cnt, total_in_tgt);
- return -EPROTO;
- }
-
- if (remaining == 0) {
- /* nothing to do, ignore */
- cifs_dbg(FYI, "no more data remains\n");
- return 0;
- }
-
- total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
- if (remaining < total_in_src)
- cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
-
- /* find end of first SMB data area */
- data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
- get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
-
- /* validate target area */
- data_area_of_src = (char *)&pSMBs->hdr.Protocol +
- get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
-
- data_area_of_tgt += total_in_tgt;
-
- total_in_tgt += total_in_src;
- /* is the result too big for the field? */
- if (total_in_tgt > USHRT_MAX) {
- cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
- total_in_tgt);
- return -EPROTO;
- }
- put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
-
- /* fix up the BCC */
- byte_count = get_bcc(target_hdr);
- byte_count += total_in_src;
- /* is the result too big for the field? */
- if (byte_count > USHRT_MAX) {
- cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
- return -EPROTO;
- }
- put_bcc(byte_count, target_hdr);
-
- byte_count = *pdu_len;
- byte_count += total_in_src;
- /* don't allow buffer to overflow */
- if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
- cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
- byte_count);
- return -ENOBUFS;
- }
- *pdu_len = byte_count;
-
- /* copy second buffer into end of first buffer */
- memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
-
- if (remaining != total_in_src) {
- /* more responses to go */
- cifs_dbg(FYI, "waiting for more secondary responses\n");
- return 1;
- }
-
- /* we are done */
- cifs_dbg(FYI, "found the last secondary response\n");
- return 0;
-}
-
static void
cifs_downgrade_oplock(struct TCP_Server_Info *server,
struct cifsInodeInfo *cinode, __u32 oplock,
cifs_set_oplock_level(cinode, oplock);
}
-static bool
-cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
- char *buf, int malformed)
-{
- if (malformed)
- return false;
- if (check2ndT2(buf) <= 0)
- return false;
- mid->multiRsp = true;
- if (mid->resp_buf) {
- /* merge response - fix up 1st*/
- malformed = coalesce_t2(buf, mid->resp_buf, &mid->response_pdu_len);
- if (malformed > 0)
- return true;
- /* All parts received or packet is malformed. */
- mid->multiEnd = true;
- dequeue_mid(server, mid, malformed);
- return true;
- }
- if (!server->large_buf) {
- /*FIXME: switch to already allocated largebuf?*/
- cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
- } else {
- /* Have first buffer */
- mid->resp_buf = buf;
- mid->large_buf = true;
- server->bigbuf = NULL;
- }
- return true;
-}
-
static bool
cifs_need_neg(struct TCP_Server_Info *server)
{
struct smb_hdr *in_buf, unsigned int in_len,
struct smb_hdr *out_buf, int *pbytes_returned,
const int flags);
+bool cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
+ char *buf, int malformed);
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
free_rsp_buf(resp_buf_type, resp_iov.iov_base);
return rc;
}
+
+/*
+ return codes:
+ 0 not a transact2, or all data present
+ >0 transact2 with that much data missing
+ -EINVAL invalid transact2
+ */
+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;
+
+ if (pSMB->Command != SMB_COM_TRANSACTION2)
+ return 0;
+
+ /* check for plausible wct, bcc and t2 data and parm sizes */
+ /* check for parm and data offset going beyond end of smb */
+ if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
+ cifs_dbg(FYI, "Invalid transact2 word count\n");
+ return -EINVAL;
+ }
+
+ pSMBt = (struct smb_t2_rsp *)pSMB;
+
+ total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
+ data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
+
+ if (total_data_size == data_in_this_rsp)
+ return 0;
+ else if (total_data_size < data_in_this_rsp) {
+ cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",
+ total_data_size, data_in_this_rsp);
+ return -EINVAL;
+ }
+
+ remaining = total_data_size - data_in_this_rsp;
+
+ cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",
+ remaining);
+ if (total_data_size > CIFSMaxBufSize) {
+ cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",
+ total_data_size, CIFSMaxBufSize);
+ return -EINVAL;
+ }
+ return remaining;
+}
+
+static int
+coalesce_t2(char *second_buf, struct smb_hdr *target_hdr, unsigned int *pdu_len)
+{
+ 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;
+ unsigned int byte_count, total_in_tgt;
+ __u16 tgt_total_cnt, src_total_cnt, total_in_src;
+
+ src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
+ tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
+
+ if (tgt_total_cnt != src_total_cnt)
+ cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",
+ src_total_cnt, tgt_total_cnt);
+
+ total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
+
+ remaining = tgt_total_cnt - total_in_tgt;
+
+ if (remaining < 0) {
+ cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",
+ tgt_total_cnt, total_in_tgt);
+ return -EPROTO;
+ }
+
+ if (remaining == 0) {
+ /* nothing to do, ignore */
+ cifs_dbg(FYI, "no more data remains\n");
+ return 0;
+ }
+
+ total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
+ if (remaining < total_in_src)
+ cifs_dbg(FYI, "transact2 2nd response contains too much data\n");
+
+ /* find end of first SMB data area */
+ data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
+ get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
+
+ /* validate target area */
+ data_area_of_src = (char *)&pSMBs->hdr.Protocol +
+ get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
+
+ data_area_of_tgt += total_in_tgt;
+
+ total_in_tgt += total_in_src;
+ /* is the result too big for the field? */
+ if (total_in_tgt > USHRT_MAX) {
+ cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",
+ total_in_tgt);
+ return -EPROTO;
+ }
+ put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
+
+ /* fix up the BCC */
+ byte_count = get_bcc(target_hdr);
+ byte_count += total_in_src;
+ /* is the result too big for the field? */
+ if (byte_count > USHRT_MAX) {
+ cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);
+ return -EPROTO;
+ }
+ put_bcc(byte_count, target_hdr);
+
+ byte_count = *pdu_len;
+ byte_count += total_in_src;
+ /* don't allow buffer to overflow */
+ if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
+ cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",
+ byte_count);
+ return -ENOBUFS;
+ }
+ *pdu_len = byte_count;
+
+ /* copy second buffer into end of first buffer */
+ memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
+
+ if (remaining != total_in_src) {
+ /* more responses to go */
+ cifs_dbg(FYI, "waiting for more secondary responses\n");
+ return 1;
+ }
+
+ /* we are done */
+ cifs_dbg(FYI, "found the last secondary response\n");
+ return 0;
+}
+
+bool
+cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,
+ char *buf, int malformed)
+{
+ if (malformed)
+ return false;
+ if (check2ndT2(buf) <= 0)
+ return false;
+ mid->multiRsp = true;
+ if (mid->resp_buf) {
+ /* merge response - fix up 1st*/
+ malformed = coalesce_t2(buf, mid->resp_buf, &mid->response_pdu_len);
+ if (malformed > 0)
+ return true;
+ /* All parts received or packet is malformed. */
+ mid->multiEnd = true;
+ dequeue_mid(server, mid, malformed);
+ return true;
+ }
+ if (!server->large_buf) {
+ /*FIXME: switch to already allocated largebuf?*/
+ cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");
+ } else {
+ /* Have first buffer */
+ mid->resp_buf = buf;
+ mid->large_buf = true;
+ server->bigbuf = NULL;
+ }
+ return true;
+}
projects / thirdparty / kernel / linux.git / commitdiff
