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cifs: add SMB2_open() arg to return POSIX data

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allows SMB2_open() callers to pass down a POSIX data buffer that will
trigger requesting POSIX create context and parsing the response into
the provided buffer.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
This commit is contained in:
Aurelien Aptel 2020-03-02 17:53:22 +01:00 committed by Steve French
parent 3d519bd126
commit 69dda3059e
6 changed files with 66 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/cifs/link.c
View File

@ -416,7 +416,7 @@ smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
}
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
NULL);
NULL, NULL);
if (rc)
goto qmf_out_open_fail;
@ -470,7 +470,7 @@ smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
NULL);
NULL, NULL);
if (rc) {
kfree(utf16_path);
return rc;

2
fs/cifs/smb2file.c
View File

@ -62,7 +62,7 @@ smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
NULL);
NULL, NULL);
if (rc)
goto out;

23
fs/cifs/smb2ops.c
View File

@ -794,7 +794,8 @@ int open_shroot(unsigned int xid, struct cifs_tcon *tcon,
tcon->crfid.has_lease = true;
smb2_parse_contexts(server, o_rsp,
&oparms.fid->epoch,
oparms.fid->lease_key, &oplock, NULL);
oparms.fid->lease_key, &oplock,
NULL, NULL);
} else
goto oshr_exit;
@ -838,7 +839,7 @@ smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
if (no_cached_open)
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
NULL);
NULL, NULL);
else
rc = open_shroot(xid, tcon, cifs_sb, &fid);
@ -878,7 +879,8 @@ smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
NULL, NULL);
if (rc)
return;
@ -913,7 +915,8 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
NULL);
if (rc) {
kfree(utf16_path);
return rc;
@ -2122,7 +2125,8 @@ smb3_notify(const unsigned int xid, struct file *pfile,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
NULL);
if (rc)
goto notify_exit;
@ -2543,7 +2547,8 @@ smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
NULL, NULL);
if (rc)
return rc;
@ -3028,7 +3033,8 @@ get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
NULL);
kfree(utf16_path);
if (!rc) {
rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
@ -3086,7 +3092,8 @@ set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
oparms.fid = &fid;
oparms.reconnect = false;
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
NULL, NULL);
kfree(utf16_path);
if (!rc) {
rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,

55
fs/cifs/smb2pdu.c
View File

@ -1951,25 +1951,46 @@ parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
}
static void
parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info)
parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
struct create_posix_rsp *posix)
{
/* struct create_posix_rsp *posix = (struct create_posix_rsp *)cc; */
int sid_len;
u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
u8 *end = beg + le32_to_cpu(cc->DataLength);
u8 *sid;
/*
* TODO: Need to add parsing for the context and return. Can
* smb2_file_all_info hold POSIX data? Need to change the
* passed type from SMB2_open.
*/
printk_once(KERN_WARNING
"SMB3 3.11 POSIX response context not completed yet\n");
memset(posix, 0, sizeof(*posix));
posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
sid = beg + 12;
sid_len = posix_info_sid_size(sid, end);
if (sid_len < 0) {
cifs_dbg(VFS, "bad owner sid in posix create response\n");
return;
}
memcpy(&posix->owner, sid, sid_len);
sid = sid + sid_len;
sid_len = posix_info_sid_size(sid, end);
if (sid_len < 0) {
cifs_dbg(VFS, "bad group sid in posix create response\n");
return;
}
memcpy(&posix->group, sid, sid_len);
cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
posix->nlink, posix->mode, posix->reparse_tag);
}
void
smb2_parse_contexts(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key, __u8 *oplock,
struct smb2_file_all_info *buf)
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key, __u8 *oplock,
struct smb2_file_all_info *buf,
struct create_posix_rsp *posix)
{
char *data_offset;
struct create_context *cc;
@ -1999,8 +2020,9 @@ smb2_parse_contexts(struct TCP_Server_Info *server,
strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
parse_query_id_ctxt(cc, buf);
else if ((le16_to_cpu(cc->NameLength) == 16)) {
if (memcmp(name, smb3_create_tag_posix, 16) == 0)
parse_posix_ctxt(cc, buf);
if (posix &&
memcmp(name, smb3_create_tag_posix, 16) == 0)
parse_posix_ctxt(cc, buf, posix);
}
/* else {
cifs_dbg(FYI, "Context not matched with len %d\n",
@ -2725,6 +2747,7 @@ SMB2_open_free(struct smb_rqst *rqst)
int
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
__u8 *oplock, struct smb2_file_all_info *buf,
struct create_posix_rsp *posix,
struct kvec *err_iov, int *buftype)
{
struct smb_rqst rqst;
@ -2803,7 +2826,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
oparms->fid->lease_key, oplock, buf);
oparms->fid->lease_key, oplock, buf, posix);
creat_exit:
SMB2_open_free(&rqst);
free_rsp_buf(resp_buftype, rsp);
@ -4302,7 +4325,7 @@ SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
return rc;
}
static int posix_info_sid_size(const void *beg, const void *end)
int posix_info_sid_size(const void *beg, const void *end)
{
size_t subauth;
int total;

12
fs/cifs/smb2pdu.h
View File

@ -1605,13 +1605,11 @@ extern char smb2_padding[7];
/* equivalent of the contents of SMB3.1.1 POSIX open context response */
struct create_posix_rsp {
__le32 nlink;
__le32 reparse_tag;
__le32 mode;
/*
* var sized owner SID
* var sized group SID
*/
u32 nlink;
u32 reparse_tag;
u32 mode;
struct cifs_sid owner; /* var-sized on the wire */
struct cifs_sid group; /* var-sized on the wire */
} __packed;
/*

5
fs/cifs/smb2proto.h
View File

@ -139,6 +139,7 @@ extern int SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon);
extern int SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms,
__le16 *path, __u8 *oplock,
struct smb2_file_all_info *buf,
struct create_posix_rsp *posix,
struct kvec *err_iov, int *resp_buftype);
extern int SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
__u8 *oplock, struct cifs_open_parms *oparms,
@ -252,7 +253,8 @@ extern enum securityEnum smb2_select_sectype(struct TCP_Server_Info *,
extern void smb2_parse_contexts(struct TCP_Server_Info *server,
struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key,
__u8 *oplock, struct smb2_file_all_info *buf);
__u8 *oplock, struct smb2_file_all_info *buf,
struct create_posix_rsp *posix);
extern int smb3_encryption_required(const struct cifs_tcon *tcon);
extern int smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
struct kvec *iov, unsigned int min_buf_size);
@ -274,4 +276,5 @@ extern int smb2_query_info_compound(const unsigned int xid,
struct cifs_sb_info *cifs_sb);
int posix_info_parse(const void *beg, const void *end,
struct smb2_posix_info_parsed *out);
int posix_info_sid_size(const void *beg, const void *end);
#endif /* _SMB2PROTO_H */