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-rw-r--r--fs/cifs/connect.c402
1 files changed, 263 insertions, 139 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4bc862a80ef..da284e3cb65 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -102,6 +102,7 @@ struct smb_vol {
bool fsc:1; /* enable fscache */
bool mfsymlinks:1; /* use Minshall+French Symlinks */
bool multiuser:1;
+ bool use_smb2:1; /* force smb2 use on mount instead of cifs */
unsigned int rsize;
unsigned int wsize;
bool sockopt_tcp_nodelay:1;
@@ -274,7 +275,8 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
char *data_area_of_target;
char *data_area_of_buf2;
int remaining;
- __u16 byte_count, total_data_size, total_in_buf, total_in_buf2;
+ unsigned int byte_count, total_in_buf;
+ __u16 total_data_size, total_in_buf2;
total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
@@ -287,7 +289,7 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
remaining = total_data_size - total_in_buf;
if (remaining < 0)
- return -EINVAL;
+ return -EPROTO;
if (remaining == 0) /* nothing to do, ignore */
return 0;
@@ -308,19 +310,28 @@ static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
data_area_of_target += total_in_buf;
/* copy second buffer into end of first buffer */
- memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
total_in_buf += total_in_buf2;
+ /* is the result too big for the field? */
+ if (total_in_buf > USHRT_MAX)
+ return -EPROTO;
put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
- byte_count = get_bcc_le(pTargetSMB);
- byte_count += total_in_buf2;
- put_bcc_le(byte_count, pTargetSMB);
- byte_count = pTargetSMB->smb_buf_length;
+ /* fix up the BCC */
+ byte_count = get_bcc(pTargetSMB);
byte_count += total_in_buf2;
+ /* is the result too big for the field? */
+ if (byte_count > USHRT_MAX)
+ return -EPROTO;
+ put_bcc(byte_count, pTargetSMB);
- /* BB also add check that we are not beyond maximum buffer size */
+ byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
+ byte_count += total_in_buf2;
+ /* don't allow buffer to overflow */
+ if (byte_count > CIFSMaxBufSize)
+ return -ENOBUFS;
+ pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
- pTargetSMB->smb_buf_length = byte_count;
+ memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
if (remaining == total_in_buf2) {
cFYI(1, "found the last secondary response");
@@ -485,8 +496,7 @@ incomplete_rcv:
/* 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 */
- pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
- smb_buffer->smb_buf_length = pdu_length;
+ pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
@@ -607,59 +617,63 @@ incomplete_rcv:
list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
- if ((mid_entry->mid == smb_buffer->Mid) &&
- (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
- (mid_entry->command == smb_buffer->Command)) {
- if (length == 0 &&
- check2ndT2(smb_buffer, server->maxBuf) > 0) {
- /* We have a multipart transact2 resp */
- isMultiRsp = true;
- if (mid_entry->resp_buf) {
- /* merge response - fix up 1st*/
- if (coalesce_t2(smb_buffer,
- mid_entry->resp_buf)) {
- mid_entry->multiRsp =
- true;
- break;
- } else {
- /* all parts received */
- mid_entry->multiEnd =
- true;
- goto multi_t2_fnd;
- }
+ if (mid_entry->mid != smb_buffer->Mid ||
+ mid_entry->midState != MID_REQUEST_SUBMITTED ||
+ mid_entry->command != smb_buffer->Command) {
+ mid_entry = NULL;
+ continue;
+ }
+
+ if (length == 0 &&
+ check2ndT2(smb_buffer, server->maxBuf) > 0) {
+ /* We have a multipart transact2 resp */
+ isMultiRsp = true;
+ if (mid_entry->resp_buf) {
+ /* merge response - fix up 1st*/
+ length = coalesce_t2(smb_buffer,
+ mid_entry->resp_buf);
+ if (length > 0) {
+ length = 0;
+ mid_entry->multiRsp = true;
+ break;
} else {
- if (!isLargeBuf) {
- cERROR(1, "1st trans2 resp needs bigbuf");
- /* BB maybe we can fix this up, switch
- to already allocated large buffer? */
- } else {
- /* Have first buffer */
- mid_entry->resp_buf =
- smb_buffer;
- mid_entry->largeBuf =
- true;
- bigbuf = NULL;
- }
+ /* all parts received or
+ * packet is malformed
+ */
+ mid_entry->multiEnd = true;
+ goto multi_t2_fnd;
+ }
+ } else {
+ if (!isLargeBuf) {
+ /*
+ * FIXME: switch to already
+ * allocated largebuf?
+ */
+ cERROR(1, "1st trans2 resp "
+ "needs bigbuf");
+ } else {
+ /* Have first buffer */
+ mid_entry->resp_buf =
+ smb_buffer;
+ mid_entry->largeBuf = true;
+ bigbuf = NULL;
}
- break;
}
- mid_entry->resp_buf = smb_buffer;
- mid_entry->largeBuf = isLargeBuf;
+ break;
+ }
+ mid_entry->resp_buf = smb_buffer;
+ mid_entry->largeBuf = isLargeBuf;
multi_t2_fnd:
- if (length == 0)
- mid_entry->midState =
- MID_RESPONSE_RECEIVED;
- else
- mid_entry->midState =
- MID_RESPONSE_MALFORMED;
+ if (length == 0)
+ mid_entry->midState = MID_RESPONSE_RECEIVED;
+ else
+ mid_entry->midState = MID_RESPONSE_MALFORMED;
#ifdef CONFIG_CIFS_STATS2
- mid_entry->when_received = jiffies;
+ mid_entry->when_received = jiffies;
#endif
- list_del_init(&mid_entry->qhead);
- mid_entry->callback(mid_entry);
- break;
- }
- mid_entry = NULL;
+ list_del_init(&mid_entry->qhead);
+ mid_entry->callback(mid_entry);
+ break;
}
spin_unlock(&GlobalMid_Lock);
@@ -721,7 +735,7 @@ multi_t2_fnd:
sock_release(csocket);
server->ssocket = NULL;
}
- /* buffer usuallly freed in free_mid - need to free it here on exit */
+ /* buffer usually freed in free_mid - need to free it here on exit */
cifs_buf_release(bigbuf);
if (smallbuf) /* no sense logging a debug message if NULL */
cifs_small_buf_release(smallbuf);
@@ -804,10 +818,11 @@ extract_hostname(const char *unc)
}
static int
-cifs_parse_mount_options(char *options, const char *devname,
+cifs_parse_mount_options(const char *mountdata, const char *devname,
struct smb_vol *vol)
{
char *value, *data, *end;
+ char *mountdata_copy, *options;
unsigned int temp_len, i, j;
char separator[2];
short int override_uid = -1;
@@ -847,9 +862,14 @@ cifs_parse_mount_options(char *options, const char *devname,
vol->actimeo = CIFS_DEF_ACTIMEO;
- if (!options)
- return 1;
+ if (!mountdata)
+ goto cifs_parse_mount_err;
+ mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
+ if (!mountdata_copy)
+ goto cifs_parse_mount_err;
+
+ options = mountdata_copy;
end = options + strlen(options);
if (strncmp(options, "sep=", 4) == 0) {
if (options[4] != 0) {
@@ -875,17 +895,22 @@ cifs_parse_mount_options(char *options, const char *devname,
if (!value) {
printk(KERN_WARNING
"CIFS: invalid or missing username\n");
- return 1; /* needs_arg; */
+ goto cifs_parse_mount_err;
} else if (!*value) {
/* null user, ie anonymous, authentication */
vol->nullauth = 1;
}
if (strnlen(value, MAX_USERNAME_SIZE) <
MAX_USERNAME_SIZE) {
- vol->username = value;
+ vol->username = kstrdup(value, GFP_KERNEL);
+ if (!vol->username) {
+ printk(KERN_WARNING "CIFS: no memory "
+ "for username\n");
+ goto cifs_parse_mount_err;
+ }
} else {
printk(KERN_WARNING "CIFS: username too long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (strnicmp(data, "pass", 4) == 0) {
if (!value) {
@@ -949,7 +974,7 @@ cifs_parse_mount_options(char *options, const char *devname,
if (vol->password == NULL) {
printk(KERN_WARNING "CIFS: no memory "
"for password\n");
- return 1;
+ goto cifs_parse_mount_err;
}
for (i = 0, j = 0; i < temp_len; i++, j++) {
vol->password[j] = value[i];
@@ -965,7 +990,7 @@ cifs_parse_mount_options(char *options, const char *devname,
if (vol->password == NULL) {
printk(KERN_WARNING "CIFS: no memory "
"for password\n");
- return 1;
+ goto cifs_parse_mount_err;
}
strcpy(vol->password, value);
}
@@ -975,11 +1000,16 @@ cifs_parse_mount_options(char *options, const char *devname,
vol->UNCip = NULL;
} else if (strnlen(value, INET6_ADDRSTRLEN) <
INET6_ADDRSTRLEN) {
- vol->UNCip = value;
+ vol->UNCip = kstrdup(value, GFP_KERNEL);
+ if (!vol->UNCip) {
+ printk(KERN_WARNING "CIFS: no memory "
+ "for UNC IP\n");
+ goto cifs_parse_mount_err;
+ }
} else {
printk(KERN_WARNING "CIFS: ip address "
"too long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (strnicmp(data, "sec", 3) == 0) {
if (!value || !*value) {
@@ -992,7 +1022,7 @@ cifs_parse_mount_options(char *options, const char *devname,
/* vol->secFlg |= CIFSSEC_MUST_SEAL |
CIFSSEC_MAY_KRB5; */
cERROR(1, "Krb5 cifs privacy not supported");
- return 1;
+ goto cifs_parse_mount_err;
} else if (strnicmp(value, "krb5", 4) == 0) {
vol->secFlg |= CIFSSEC_MAY_KRB5;
} else if (strnicmp(value, "ntlmsspi", 8) == 0) {
@@ -1022,7 +1052,23 @@ cifs_parse_mount_options(char *options, const char *devname,
vol->nullauth = 1;
} else {
cERROR(1, "bad security option: %s", value);
- return 1;
+ goto cifs_parse_mount_err;
+ }
+ } else if (strnicmp(data, "vers", 3) == 0) {
+ if (!value || !*value) {
+ cERROR(1, "no protocol version specified"
+ " after vers= mount option");
+ } else if ((strnicmp(value, "cifs", 4) == 0) ||
+ (strnicmp(value, "1", 1) == 0)) {
+ /* this is the default */
+ continue;
+ } else if ((strnicmp(value, "smb2", 4) == 0) ||
+ (strnicmp(value, "2", 1) == 0)) {
+#ifdef CONFIG_CIFS_SMB2
+ vol->use_smb2 = true;
+#else
+ cERROR(1, "smb2 support not enabled");
+#endif /* CONFIG_CIFS_SMB2 */
}
} else if ((strnicmp(data, "unc", 3) == 0)
|| (strnicmp(data, "target", 6) == 0)
@@ -1030,12 +1076,12 @@ cifs_parse_mount_options(char *options, const char *devname,
if (!value || !*value) {
printk(KERN_WARNING "CIFS: invalid path to "
"network resource\n");
- return 1; /* needs_arg; */
+ goto cifs_parse_mount_err;
}
if ((temp_len = strnlen(value, 300)) < 300) {
vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
if (vol->UNC == NULL)
- return 1;
+ goto cifs_parse_mount_err;
strcpy(vol->UNC, value);
if (strncmp(vol->UNC, "//", 2) == 0) {
vol->UNC[0] = '\\';
@@ -1044,27 +1090,32 @@ cifs_parse_mount_options(char *options, const char *devname,
printk(KERN_WARNING
"CIFS: UNC Path does not begin "
"with // or \\\\ \n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else {
printk(KERN_WARNING "CIFS: UNC name too long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if ((strnicmp(data, "domain", 3) == 0)
|| (strnicmp(data, "workgroup", 5) == 0)) {
if (!value || !*value) {
printk(KERN_WARNING "CIFS: invalid domain name\n");
- return 1; /* needs_arg; */
+ goto cifs_parse_mount_err;
}
/* BB are there cases in which a comma can be valid in
a domain name and need special handling? */
if (strnlen(value, 256) < 256) {
- vol->domainname = value;
+ vol->domainname = kstrdup(value, GFP_KERNEL);
+ if (!vol->domainname) {
+ printk(KERN_WARNING "CIFS: no memory "
+ "for domainname\n");
+ goto cifs_parse_mount_err;
+ }
cFYI(1, "Domain name set");
} else {
printk(KERN_WARNING "CIFS: domain name too "
"long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (strnicmp(data, "srcaddr", 7) == 0) {
vol->srcaddr.ss_family = AF_UNSPEC;
@@ -1072,7 +1123,7 @@ cifs_parse_mount_options(char *options, const char *devname,
if (!value || !*value) {
printk(KERN_WARNING "CIFS: srcaddr value"
" not specified.\n");
- return 1; /* needs_arg; */
+ goto cifs_parse_mount_err;
}
i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
value, strlen(value));
@@ -1080,20 +1131,20 @@ cifs_parse_mount_options(char *options, const char *devname,
printk(KERN_WARNING "CIFS: Could not parse"
" srcaddr: %s\n",
value);
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (strnicmp(data, "prefixpath", 10) == 0) {
if (!value || !*value) {
printk(KERN_WARNING
"CIFS: invalid path prefix\n");
- return 1; /* needs_argument */
+ goto cifs_parse_mount_err;
}
if ((temp_len = strnlen(value, 1024)) < 1024) {
if (value[0] != '/')
temp_len++; /* missing leading slash */
vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
if (vol->prepath == NULL)
- return 1;
+ goto cifs_parse_mount_err;
if (value[0] != '/') {
vol->prepath[0] = '/';
strcpy(vol->prepath+1, value);
@@ -1102,24 +1153,33 @@ cifs_parse_mount_options(char *options, const char *devname,
cFYI(1, "prefix path %s", vol->prepath);
} else {
printk(KERN_WARNING "CIFS: prefix too long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (strnicmp(data, "iocharset", 9) == 0) {
if (!value || !*value) {
printk(KERN_WARNING "CIFS: invalid iocharset "
"specified\n");
- return 1; /* needs_arg; */
+ goto cifs_parse_mount_err;
}
if (strnlen(value, 65) < 65) {
- if (strnicmp(value, "default", 7))
- vol->iocharset = value;
+ if (strnicmp(value, "default", 7)) {
+ vol->iocharset = kstrdup(value,
+ GFP_KERNEL);
+
+ if (!vol->iocharset) {
+ printk(KERN_WARNING "CIFS: no "
+ "memory for"
+ "charset\n");
+ goto cifs_parse_mount_err;
+ }
+ }
/* if iocharset not set then load_nls_default
is used by caller */
cFYI(1, "iocharset set to %s", value);
} else {
printk(KERN_WARNING "CIFS: iocharset name "
"too long.\n");
- return 1;
+ goto cifs_parse_mount_err;
}
} else if (!strnicmp(data, "uid", 3) && value && *value) {
vol->linux_uid = simple_strtoul(value, &value, 0);
@@ -1232,7 +1292,7 @@ cifs_parse_mount_options(char *options, const char *devname,
if (vol->actimeo > CIFS_MAX_ACTIMEO) {
cERROR(1, "CIFS: attribute cache"
"timeout too large");
- return 1;
+ goto cifs_parse_mount_err;
}
}
} else if (strnicmp(data, "credentials", 4) == 0) {
@@ -1376,7 +1436,7 @@ cifs_parse_mount_options(char *options, const char *devname,
#ifndef CONFIG_CIFS_FSCACHE
cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE"
"kernel config option set");
- return 1;
+ goto cifs_parse_mount_err;
#endif
vol->fsc = true;
} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
@@ -1391,12 +1451,12 @@ cifs_parse_mount_options(char *options, const char *devname,
if (devname == NULL) {
printk(KERN_WARNING "CIFS: Missing UNC name for mount "
"target\n");
- return 1;
+ goto cifs_parse_mount_err;
}
if ((temp_len = strnlen(devname, 300)) < 300) {
vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
if (vol->UNC == NULL)
- return 1;
+ goto cifs_parse_mount_err;
strcpy(vol->UNC, devname);
if (strncmp(vol->UNC, "//", 2) == 0) {
vol->UNC[0] = '\\';
@@ -1404,21 +1464,21 @@ cifs_parse_mount_options(char *options, const char *devname,
} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
printk(KERN_WARNING "CIFS: UNC Path does not "
"begin with // or \\\\ \n");
- return 1;
+ goto cifs_parse_mount_err;
}
value = strpbrk(vol->UNC+2, "/\\");
if (value)
*value = '\\';
} else {
printk(KERN_WARNING "CIFS: UNC name too long\n");
- return 1;
+ goto cifs_parse_mount_err;
}
}
if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
cERROR(1, "Multiuser mounts currently require krb5 "
"authentication!");
- return 1;
+ goto cifs_parse_mount_err;
}
if (vol->UNCip == NULL)
@@ -1436,7 +1496,12 @@ cifs_parse_mount_options(char *options, const char *devname,
printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
"specified with no gid= option.\n");
+ kfree(mountdata_copy);
return 0;
+
+cifs_parse_mount_err:
+ kfree(mountdata_copy);
+ return 1;
}
/** Returns true if srcaddr isn't specified and rhs isn't
@@ -2266,7 +2331,7 @@ ip_rfc1001_connect(struct TCP_Server_Info *server)
smb_buf = (struct smb_hdr *)ses_init_buf;
/* sizeof RFC1002_SESSION_REQUEST with no scope */
- smb_buf->smb_buf_length = 0x81000044;
+ smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
rc = smb_send(server, smb_buf, 0x44);
kfree(ses_init_buf);
/*
@@ -2659,6 +2724,11 @@ is_path_accessible(int xid, struct cifsTconInfo *tcon,
0 /* not legacy */, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+ if (rc == -EOPNOTSUPP || rc == -EINVAL)
+ rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
+ cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
kfree(pfile_info);
return rc;
}
@@ -2672,8 +2742,12 @@ cleanup_volume_info(struct smb_vol **pvolume_info)
return;
volume_info = *pvolume_info;
+ kfree(volume_info->username);
kzfree(volume_info->password);
kfree(volume_info->UNC);
+ kfree(volume_info->UNCip);
+ kfree(volume_info->domainname);
+ kfree(volume_info->iocharset);
kfree(volume_info->prepath);
kfree(volume_info);
*pvolume_info = NULL;
@@ -2710,11 +2784,65 @@ build_unc_path_to_root(const struct smb_vol *volume_info,
full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
return full_path;
}
+
+/*
+ * Perform a dfs referral query for a share and (optionally) prefix
+ *
+ * If a referral is found, cifs_sb->mountdata will be (re-)allocated
+ * to a string containing updated options for the submount. Otherwise it
+ * will be left untouched.
+ *
+ * Returns the rc from get_dfs_path to the caller, which can be used to
+ * determine whether there were referrals.
+ */
+static int
+expand_dfs_referral(int xid, struct cifsSesInfo *pSesInfo,
+ struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
+ int check_prefix)
+{
+ int rc;
+ unsigned int num_referrals = 0;
+ struct dfs_info3_param *referrals = NULL;
+ char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
+
+ full_path = build_unc_path_to_root(volume_info, cifs_sb);
+ if (IS_ERR(full_path))
+ return PTR_ERR(full_path);
+
+ /* For DFS paths, skip the first '\' of the UNC */
+ ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
+
+ rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
+ &num_referrals, &referrals,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+ if (!rc && num_referrals > 0) {
+ char *fake_devname = NULL;
+
+ mdata = cifs_compose_mount_options(cifs_sb->mountdata,
+ full_path + 1, referrals,
+ &fake_devname);
+
+ free_dfs_info_array(referrals, num_referrals);
+ kfree(fake_devname);
+
+ if (cifs_sb->mountdata != NULL)
+ kfree(cifs_sb->mountdata);
+
+ if (IS_ERR(mdata)) {
+ rc = PTR_ERR(mdata);
+ mdata = NULL;
+ }
+ cifs_sb->mountdata = mdata;
+ }
+ kfree(full_path);
+ return rc;
+}
#endif
int
cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
- char *mount_data_global, const char *devname)
+ const char *devname)
{
int rc;
int xid;
@@ -2723,13 +2851,20 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
struct cifsTconInfo *tcon;
struct TCP_Server_Info *srvTcp;
char *full_path;
- char *mount_data = mount_data_global;
struct tcon_link *tlink;
#ifdef CONFIG_CIFS_DFS_UPCALL
- struct dfs_info3_param *referrals = NULL;
- unsigned int num_referrals = 0;
int referral_walks_count = 0;
try_mount_again:
+ /* cleanup activities if we're chasing a referral */
+ if (referral_walks_count) {
+ if (tcon)
+ cifs_put_tcon(tcon);
+ else if (pSesInfo)
+ cifs_put_smb_ses(pSesInfo);
+
+ cleanup_volume_info(&volume_info);
+ FreeXid(xid);
+ }
#endif
rc = 0;
tcon = NULL;
@@ -2746,7 +2881,8 @@ try_mount_again:
goto out;
}
- if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
+ if (cifs_parse_mount_options(cifs_sb->mountdata, devname,
+ volume_info)) {
rc = -EINVAL;
goto out;
}
@@ -2842,6 +2978,24 @@ try_mount_again:
(tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
remote_path_check:
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ /*
+ * Perform an unconditional check for whether there are DFS
+ * referrals for this path without prefix, to provide support
+ * for DFS referrals from w2k8 servers which don't seem to respond
+ * with PATH_NOT_COVERED to requests that include the prefix.
+ * Chase the referral if found, otherwise continue normally.
+ */
+ if (referral_walks_count == 0) {
+ int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
+ cifs_sb, false);
+ if (!refrc) {
+ referral_walks_count++;
+ goto try_mount_again;
+ }
+ }
+#endif
+
/* check if a whole path (including prepath) is not remote */
if (!rc && tcon) {
/* build_path_to_root works only when we have a valid tcon */
@@ -2875,46 +3029,15 @@ remote_path_check:
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
convert_delimiter(cifs_sb->prepath,
CIFS_DIR_SEP(cifs_sb));
- full_path = build_unc_path_to_root(volume_info, cifs_sb);
- if (IS_ERR(full_path)) {
- rc = PTR_ERR(full_path);
- goto mount_fail_check;
- }
-
- cFYI(1, "Getting referral for: %s", full_path);
- rc = get_dfs_path(xid, pSesInfo , full_path + 1,
- cifs_sb->local_nls, &num_referrals, &referrals,
- cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
- if (!rc && num_referrals > 0) {
- char *fake_devname = NULL;
-
- if (mount_data != mount_data_global)
- kfree(mount_data);
- mount_data = cifs_compose_mount_options(
- cifs_sb->mountdata, full_path + 1,
- referrals, &fake_devname);
+ rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
+ true);
- free_dfs_info_array(referrals, num_referrals);
- kfree(fake_devname);
- kfree(full_path);
-
- if (IS_ERR(mount_data)) {
- rc = PTR_ERR(mount_data);
- mount_data = NULL;
- goto mount_fail_check;
- }
-
- if (tcon)
- cifs_put_tcon(tcon);
- else if (pSesInfo)
- cifs_put_smb_ses(pSesInfo);
-
- cleanup_volume_info(&volume_info);
+ if (!rc) {
referral_walks_count++;
- FreeXid(xid);
goto try_mount_again;
}
+ goto mount_fail_check;
#else /* No DFS support, return error on mount */
rc = -EOPNOTSUPP;
#endif
@@ -2947,8 +3070,6 @@ remote_path_check:
mount_fail_check:
/* on error free sesinfo and tcon struct if needed */
if (rc) {
- if (mount_data != mount_data_global)
- kfree(mount_data);
/* If find_unc succeeded then rc == 0 so we can not end */
/* up accidentally freeing someone elses tcon struct */
if (tcon)
@@ -3064,7 +3185,8 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
bcc_ptr += strlen("?????");
bcc_ptr += 1;
count = bcc_ptr - &pSMB->Password[0];
- pSMB->hdr.smb_buf_length += count;
+ pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
+ pSMB->hdr.smb_buf_length) + count);
pSMB->ByteCount = cpu_to_le16(count);
rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
@@ -3239,7 +3361,9 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon = NULL;
struct smb_vol *vol_info;
- char username[MAX_USERNAME_SIZE + 1];
+ char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
+ /* We used to have this as MAX_USERNAME which is */
+ /* way too big now (256 instead of 32) */
vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
if (vol_info == NULL) {
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-01-04 18:03:47 +0000