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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
b355d0c9 | 2 | |
3b2e7dc5 LN |
3 | #include "sd-device.h" |
4 | ||
35b35190 | 5 | #include "alloc-util.h" |
3b2e7dc5 | 6 | #include "device-private.h" |
b355d0c9 | 7 | #include "netif-naming-scheme.h" |
35b35190 ZJS |
8 | #include "proc-cmdline.h" |
9 | #include "string-util.h" | |
ff516b43 | 10 | #include "string-table.h" |
35b35190 ZJS |
11 | |
12 | static const NamingScheme naming_schemes[] = { | |
13 | { "v238", NAMING_V238 }, | |
14 | { "v239", NAMING_V239 }, | |
15 | { "v240", NAMING_V240 }, | |
96848152 | 16 | { "v241", NAMING_V241 }, |
eaa9d507 | 17 | { "v243", NAMING_V243 }, |
bc5ea049 | 18 | { "v245", NAMING_V245 }, |
66ad93e8 | 19 | { "v247", NAMING_V247 }, |
a496a238 | 20 | { "v249", NAMING_V249 }, |
d6eda677 | 21 | { "v250", NAMING_V250 }, |
66425daf | 22 | { "v251", NAMING_V251 }, |
65c2ad98 | 23 | { "v252", NAMING_V252 }, |
a0961675 | 24 | { "v253", NAMING_V253 }, |
acd3f692 | 25 | { "v254", NAMING_V254 }, |
64f2cf77 | 26 | { "v255", NAMING_V255 }, |
35b35190 | 27 | /* … add more schemes here, as the logic to name devices is updated … */ |
681cb84a ZJS |
28 | |
29 | EXTRA_NET_NAMING_MAP | |
35b35190 ZJS |
30 | }; |
31 | ||
77faadfd | 32 | const NamingScheme* naming_scheme_from_name(const char *name) { |
ad337e55 | 33 | /* "latest" may either be defined explicitly by the extra map, in which case we will find it in |
681cb84a ZJS |
34 | * the table like any other name. After iterating through the table, we check for "latest" again, |
35 | * which means that if not mapped explicitly, it maps to the last defined entry, whatever that is. */ | |
35b35190 | 36 | |
acaa6368 | 37 | for (size_t i = 0; i < ELEMENTSOF(naming_schemes); i++) |
35b35190 ZJS |
38 | if (streq(naming_schemes[i].name, name)) |
39 | return naming_schemes + i; | |
40 | ||
681cb84a ZJS |
41 | if (streq(name, "latest")) |
42 | return naming_schemes + ELEMENTSOF(naming_schemes) - 1; | |
43 | ||
35b35190 ZJS |
44 | return NULL; |
45 | } | |
46 | ||
47 | const NamingScheme* naming_scheme(void) { | |
48 | static const NamingScheme *cache = NULL; | |
49 | _cleanup_free_ char *buffer = NULL; | |
50 | const char *e, *k; | |
51 | ||
52 | if (cache) | |
53 | return cache; | |
54 | ||
55 | /* Acquire setting from the kernel command line */ | |
78266a54 | 56 | (void) proc_cmdline_get_key("net.naming_scheme", 0, &buffer); |
35b35190 ZJS |
57 | |
58 | /* Also acquire it from an env var */ | |
59 | e = getenv("NET_NAMING_SCHEME"); | |
60 | if (e) { | |
61 | if (*e == ':') { | |
62 | /* If prefixed with ':' the kernel cmdline takes precedence */ | |
63 | k = buffer ?: e + 1; | |
64 | } else | |
65 | k = e; /* Otherwise the env var takes precedence */ | |
66 | } else | |
67 | k = buffer; | |
68 | ||
69 | if (k) { | |
70 | cache = naming_scheme_from_name(k); | |
71 | if (cache) { | |
72 | log_info("Using interface naming scheme '%s'.", cache->name); | |
73 | return cache; | |
74 | } | |
75 | ||
76 | log_warning("Unknown interface naming scheme '%s' requested, ignoring.", k); | |
77 | } | |
78 | ||
79 | cache = naming_scheme_from_name(DEFAULT_NET_NAMING_SCHEME); | |
80 | assert(cache); | |
81 | log_info("Using default interface naming scheme '%s'.", cache->name); | |
82 | ||
83 | return cache; | |
84 | } | |
ff516b43 YW |
85 | |
86 | static const char* const name_policy_table[_NAMEPOLICY_MAX] = { | |
8b018319 ZJS |
87 | [NAMEPOLICY_KERNEL] = "kernel", |
88 | [NAMEPOLICY_KEEP] = "keep", | |
ff516b43 | 89 | [NAMEPOLICY_DATABASE] = "database", |
8b018319 ZJS |
90 | [NAMEPOLICY_ONBOARD] = "onboard", |
91 | [NAMEPOLICY_SLOT] = "slot", | |
92 | [NAMEPOLICY_PATH] = "path", | |
93 | [NAMEPOLICY_MAC] = "mac", | |
ff516b43 YW |
94 | }; |
95 | ||
96 | DEFINE_STRING_TABLE_LOOKUP(name_policy, NamePolicy); | |
97 | ||
98 | static const char* const alternative_names_policy_table[_NAMEPOLICY_MAX] = { | |
99 | [NAMEPOLICY_DATABASE] = "database", | |
8b018319 ZJS |
100 | [NAMEPOLICY_ONBOARD] = "onboard", |
101 | [NAMEPOLICY_SLOT] = "slot", | |
102 | [NAMEPOLICY_PATH] = "path", | |
103 | [NAMEPOLICY_MAC] = "mac", | |
ff516b43 YW |
104 | }; |
105 | ||
106 | DEFINE_STRING_TABLE_LOOKUP(alternative_names_policy, NamePolicy); | |
3b2e7dc5 LN |
107 | |
108 | static int naming_sysattr_allowed_by_default(sd_device *dev) { | |
109 | int r; | |
110 | ||
111 | assert(dev); | |
112 | ||
113 | r = device_get_property_bool(dev, "ID_NET_NAME_ALLOW"); | |
114 | if (r == -ENOENT) | |
115 | return true; | |
116 | ||
117 | return r; | |
118 | } | |
119 | ||
120 | static int naming_sysattr_allowed(sd_device *dev, const char *sysattr) { | |
121 | char *sysattr_property; | |
122 | int r; | |
123 | ||
124 | assert(dev); | |
125 | assert(sysattr); | |
126 | ||
127 | sysattr_property = strjoina("ID_NET_NAME_ALLOW_", sysattr); | |
128 | ascii_strupper(sysattr_property); | |
129 | ||
130 | r = device_get_property_bool(dev, sysattr_property); | |
131 | if (r == -ENOENT) | |
132 | /* If ID_NET_NAME_ALLOW is not set or set to 1 default is to allow */ | |
133 | return naming_sysattr_allowed_by_default(dev); | |
134 | ||
135 | return r; | |
136 | } | |
137 | ||
138 | int device_get_sysattr_int_filtered(sd_device *device, const char *sysattr, int *ret_value) { | |
139 | int r; | |
140 | ||
141 | r = naming_sysattr_allowed(device, sysattr); | |
142 | if (r < 0) | |
143 | return r; | |
144 | if (r == 0) | |
145 | return -ENOENT; | |
146 | ||
147 | return device_get_sysattr_int(device, sysattr, ret_value); | |
148 | } | |
149 | ||
150 | int device_get_sysattr_unsigned_filtered(sd_device *device, const char *sysattr, unsigned *ret_value) { | |
151 | int r; | |
152 | ||
153 | r = naming_sysattr_allowed(device, sysattr); | |
154 | if (r < 0) | |
155 | return r; | |
156 | if (r == 0) | |
157 | return -ENOENT; | |
158 | ||
159 | return device_get_sysattr_unsigned(device, sysattr, ret_value); | |
160 | } | |
161 | ||
162 | int device_get_sysattr_bool_filtered(sd_device *device, const char *sysattr) { | |
163 | int r; | |
164 | ||
165 | r = naming_sysattr_allowed(device, sysattr); | |
166 | if (r < 0) | |
167 | return r; | |
168 | if (r == 0) | |
169 | return -ENOENT; | |
170 | ||
171 | return device_get_sysattr_bool(device, sysattr); | |
172 | } | |
173 | ||
174 | int device_get_sysattr_value_filtered(sd_device *device, const char *sysattr, const char **ret_value) { | |
175 | int r; | |
176 | ||
177 | r = naming_sysattr_allowed(device, sysattr); | |
178 | if (r < 0) | |
179 | return r; | |
180 | if (r == 0) | |
181 | return -ENOENT; | |
182 | ||
183 | return sd_device_get_sysattr_value(device, sysattr, ret_value); | |
184 | } |