Add function for switching between an nfs4_mount_data structure from user
space (the current nfs4 mount mechanism) and generating an nfs4_mount_data
structure from a text string containing nfs4 mount options.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/super.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 123 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 8585fa5..e0acd08 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1643,6 +1643,129 @@ static void *nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
return dst;
}
+static int nfs4_validate_mount_data(struct nfs4_mount_data **options,
+ const char *dev_name,
+ struct sockaddr_in *addr,
+ rpc_authflavor_t *authflavour,
+ char **hostname,
+ char **mntpath,
+ char *ip_addr)
+{
+ struct nfs4_mount_data *data = *options;
+ char *c;
+ unsigned len;
+
+ if (data == NULL) {
+ dprintk("%s: missing data argument\n", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ switch (data->version) {
+ case 1:
+ if (data->host_addrlen != sizeof(*addr))
+ return -EINVAL;
+ if (copy_from_user(addr, data->host_addr, sizeof(*addr)))
+ return -EFAULT;
+ if (addr->sin_port == 0)
+ addr->sin_port = htons(NFS_PORT);
+ if (!nfs_verify_server_address((struct sockaddr *) addr,
+ data->host_addrlen))
+ return -EINVAL;
+
+ switch (data->auth_flavourlen) {
+ case 0:
+ *authflavour = RPC_AUTH_UNIX;
+ break;
+ case 1:
+ if (copy_from_user(authflavour, data->auth_flavours,
+ sizeof(*authflavour)))
+ return -EFAULT;
+ default:
+ goto out_inval_auth;
+ }
+
+ c = nfs_copy_user_string(ip_addr, &data->client_addr, 80);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+
+ c = nfs_copy_user_string(NULL, &data->hostname, 256);
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ *hostname = c;
+
+ c = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
+ if (IS_ERR(c)) {
+ kfree(*hostname);
+ return PTR_ERR(c);
+ }
+ *mntpath = c;
+ dprintk("MNTPATH: %s\n", *mntpath);
+
+ return 0;
+ default:
+ data = nfs4_convert_mount_opts((char *) data);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ *options = data;
+
+ memcpy(addr, data->host_addr, sizeof(*addr));
+ if (!nfs_verify_server_address((struct sockaddr *) addr,
+ data->host_addrlen))
+ return -EINVAL;
+
+ switch (data->auth_flavourlen) {
+ case 0:
+ *authflavour = RPC_AUTH_UNIX;
+ break;
+ case 1:
+ *authflavour = (rpc_authflavor_t) data->auth_flavours[0];
+ break;
+ default:
+ goto out_inval_auth;
+ }
+
+ memset(ip_addr, '\0', data->client_addr.len + 1);
+ strncpy(ip_addr, data->client_addr.data, data->client_addr.len);
+
+ /*
+ * Split "dev_name" into "hostname:mntpath".
+ */
+ c = strchr(dev_name, ':');
+ if (c == NULL)
+ return -EINVAL;
+ /* while calculating len, pretend ':' is '\0' */
+ len = c - dev_name;
+ if (len > 256)
+ return -EINVAL;
+ *hostname = kzalloc(len, GFP_KERNEL);
+ if (*hostname == NULL)
+ return -ENOMEM;
+ strncpy(*hostname, dev_name, len - 1);
+
+ c++; /* step over the ':' */
+ len = strlen(c);
+ if (len > 1023) {
+ kfree(*hostname);
+ return -EINVAL;
+ }
+ *mntpath = kzalloc(len + 1, GFP_KERNEL);
+ if (*mntpath == NULL) {
+ kfree(*hostname);
+ return -ENOMEM;
+ }
+ strncpy(*mntpath, c, len);
+
+ dprintk("MNTPATH: %s\n", *mntpath);
+
+ return 0;
+ }
+
+out_inval_auth:
+ dprintk("NFS4: Invalid number of RPC auth flavours %d\n",
+ data->auth_flavourlen);
+ return -EINVAL;
+}
+
/*
* Finish setting up a cloned NFS4 superblock
*/
-
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