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8eecd1c2 PAS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * SMB root file system support | |
4 | * | |
5 | * Copyright (c) 2019 Paulo Alcantara <palcantara@suse.de> | |
6 | */ | |
7 | #include <linux/init.h> | |
8 | #include <linux/fs.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/ctype.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/root_dev.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/in.h> | |
15 | #include <linux/inet.h> | |
16 | #include <net/ipconfig.h> | |
17 | ||
18 | #define DEFAULT_MNT_OPTS \ | |
19 | "vers=1.0,cifsacl,mfsymlinks,rsize=1048576,wsize=65536,uid=0,gid=0," \ | |
20 | "hard,rootfs" | |
21 | ||
22 | static char root_dev[2048] __initdata = ""; | |
23 | static char root_opts[1024] __initdata = DEFAULT_MNT_OPTS; | |
24 | ||
25 | static __be32 __init parse_srvaddr(char *start, char *end) | |
26 | { | |
352f2c9a | 27 | /* TODO: ipv6 support */ |
8eecd1c2 PAS |
28 | char addr[sizeof("aaa.bbb.ccc.ddd")]; |
29 | int i = 0; | |
30 | ||
31 | while (start < end && i < sizeof(addr) - 1) { | |
32 | if (isdigit(*start) || *start == '.') | |
33 | addr[i++] = *start; | |
34 | start++; | |
35 | } | |
36 | addr[i] = '\0'; | |
37 | return in_aton(addr); | |
38 | } | |
39 | ||
40 | /* cifsroot=//<server-ip>/<share>[,options] */ | |
41 | static int __init cifs_root_setup(char *line) | |
42 | { | |
43 | char *s; | |
44 | int len; | |
45 | __be32 srvaddr = htonl(INADDR_NONE); | |
46 | ||
47 | ROOT_DEV = Root_CIFS; | |
48 | ||
49 | if (strlen(line) > 3 && line[0] == '/' && line[1] == '/') { | |
50 | s = strchr(&line[2], '/'); | |
51 | if (!s || s[1] == '\0') | |
52 | return 1; | |
53 | ||
352f2c9a | 54 | /* make s point to ',' or '\0' at end of line */ |
8eecd1c2 | 55 | s = strchrnul(s, ','); |
352f2c9a | 56 | /* len is strlen(unc) + '\0' */ |
8eecd1c2 | 57 | len = s - line + 1; |
352f2c9a | 58 | if (len > sizeof(root_dev)) { |
a0a3036b | 59 | pr_err("Root-CIFS: UNC path too long\n"); |
352f2c9a AA |
60 | return 1; |
61 | } | |
62 | strlcpy(root_dev, line, len); | |
63 | srvaddr = parse_srvaddr(&line[2], s); | |
64 | if (*s) { | |
65 | int n = snprintf(root_opts, | |
66 | sizeof(root_opts), "%s,%s", | |
8eecd1c2 | 67 | DEFAULT_MNT_OPTS, s + 1); |
352f2c9a | 68 | if (n >= sizeof(root_opts)) { |
a0a3036b | 69 | pr_err("Root-CIFS: mount options string too long\n"); |
352f2c9a AA |
70 | root_opts[sizeof(root_opts)-1] = '\0'; |
71 | return 1; | |
8eecd1c2 PAS |
72 | } |
73 | } | |
74 | } | |
75 | ||
76 | root_server_addr = srvaddr; | |
77 | ||
78 | return 1; | |
79 | } | |
80 | ||
81 | __setup("cifsroot=", cifs_root_setup); | |
82 | ||
83 | int __init cifs_root_data(char **dev, char **opts) | |
84 | { | |
85 | if (!root_dev[0] || root_server_addr == htonl(INADDR_NONE)) { | |
a0a3036b | 86 | pr_err("Root-CIFS: no SMB server address\n"); |
8eecd1c2 PAS |
87 | return -1; |
88 | } | |
89 | ||
90 | *dev = root_dev; | |
91 | *opts = root_opts; | |
92 | ||
93 | return 0; | |
94 | } |