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- // SPDX-License-Identifier: GPL-2.0
- /*
- * SMB root file system support
- *
- * Copyright (c) 2019 Paulo Alcantara <[email protected]>
- */
- #include <linux/init.h>
- #include <linux/fs.h>
- #include <linux/types.h>
- #include <linux/ctype.h>
- #include <linux/string.h>
- #include <linux/root_dev.h>
- #include <linux/kernel.h>
- #include <linux/in.h>
- #include <linux/inet.h>
- #include <net/ipconfig.h>
- #define DEFAULT_MNT_OPTS \
- "vers=1.0,cifsacl,mfsymlinks,rsize=1048576,wsize=65536,uid=0,gid=0," \
- "hard,rootfs"
- static char root_dev[2048] __initdata = "";
- static char root_opts[1024] __initdata = DEFAULT_MNT_OPTS;
- static __be32 __init parse_srvaddr(char *start, char *end)
- {
- /* TODO: ipv6 support */
- char addr[sizeof("aaa.bbb.ccc.ddd")];
- int i = 0;
- while (start < end && i < sizeof(addr) - 1) {
- if (isdigit(*start) || *start == '.')
- addr[i++] = *start;
- start++;
- }
- addr[i] = '\0';
- return in_aton(addr);
- }
- /* cifsroot=//<server-ip>/<share>[,options] */
- static int __init cifs_root_setup(char *line)
- {
- char *s;
- int len;
- __be32 srvaddr = htonl(INADDR_NONE);
- ROOT_DEV = Root_CIFS;
- if (strlen(line) > 3 && line[0] == '/' && line[1] == '/') {
- s = strchr(&line[2], '/');
- if (!s || s[1] == '\0')
- return 1;
- /* make s point to ',' or '\0' at end of line */
- s = strchrnul(s, ',');
- /* len is strlen(unc) + '\0' */
- len = s - line + 1;
- if (len > sizeof(root_dev)) {
- pr_err("Root-CIFS: UNC path too long\n");
- return 1;
- }
- strscpy(root_dev, line, len);
- srvaddr = parse_srvaddr(&line[2], s);
- if (*s) {
- int n = snprintf(root_opts,
- sizeof(root_opts), "%s,%s",
- DEFAULT_MNT_OPTS, s + 1);
- if (n >= sizeof(root_opts)) {
- pr_err("Root-CIFS: mount options string too long\n");
- root_opts[sizeof(root_opts)-1] = '\0';
- return 1;
- }
- }
- }
- root_server_addr = srvaddr;
- return 1;
- }
- __setup("cifsroot=", cifs_root_setup);
- int __init cifs_root_data(char **dev, char **opts)
- {
- if (!root_dev[0] || root_server_addr == htonl(INADDR_NONE)) {
- pr_err("Root-CIFS: no SMB server address\n");
- return -1;
- }
- *dev = root_dev;
- *opts = root_opts;
- return 0;
- }
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