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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | Copyright 2013 Tom Gundersen <teg@jklm.no> | |
4 | ***/ | |
5 | ||
6 | #include "condition.h" | |
7 | #include "conf-parser.h" | |
8 | #include "networkd-util.h" | |
9 | #include "parse-util.h" | |
10 | #include "string-table.h" | |
11 | #include "string-util.h" | |
12 | #include "util.h" | |
13 | ||
14 | const char *address_family_boolean_to_string(AddressFamilyBoolean b) { | |
15 | if (IN_SET(b, ADDRESS_FAMILY_YES, ADDRESS_FAMILY_NO)) | |
16 | return yes_no(b == ADDRESS_FAMILY_YES); | |
17 | ||
18 | if (b == ADDRESS_FAMILY_IPV4) | |
19 | return "ipv4"; | |
20 | if (b == ADDRESS_FAMILY_IPV6) | |
21 | return "ipv6"; | |
22 | ||
23 | return NULL; | |
24 | } | |
25 | ||
26 | AddressFamilyBoolean address_family_boolean_from_string(const char *s) { | |
27 | int r; | |
28 | ||
29 | /* Make this a true superset of a boolean */ | |
30 | ||
31 | r = parse_boolean(s); | |
32 | if (r > 0) | |
33 | return ADDRESS_FAMILY_YES; | |
34 | if (r == 0) | |
35 | return ADDRESS_FAMILY_NO; | |
36 | ||
37 | if (streq(s, "ipv4")) | |
38 | return ADDRESS_FAMILY_IPV4; | |
39 | if (streq(s, "ipv6")) | |
40 | return ADDRESS_FAMILY_IPV6; | |
41 | ||
42 | return _ADDRESS_FAMILY_BOOLEAN_INVALID; | |
43 | } | |
44 | ||
45 | DEFINE_CONFIG_PARSE_ENUM(config_parse_address_family_boolean, address_family_boolean, AddressFamilyBoolean, "Failed to parse option"); | |
46 | ||
47 | int config_parse_address_family_boolean_with_kernel( | |
48 | const char* unit, | |
49 | const char *filename, | |
50 | unsigned line, | |
51 | const char *section, | |
52 | unsigned section_line, | |
53 | const char *lvalue, | |
54 | int ltype, | |
55 | const char *rvalue, | |
56 | void *data, | |
57 | void *userdata) { | |
58 | ||
59 | AddressFamilyBoolean *fwd = data, s; | |
60 | ||
61 | assert(filename); | |
62 | assert(lvalue); | |
63 | assert(rvalue); | |
64 | assert(data); | |
65 | ||
66 | /* This function is mostly obsolete now. It simply redirects | |
67 | * "kernel" to "no". In older networkd versions we used to | |
68 | * distuingish IPForward=off from IPForward=kernel, where the | |
69 | * former would explicitly turn off forwarding while the | |
70 | * latter would simply not touch the setting. But that logic | |
71 | * is gone, hence silently accept the old setting, but turn it | |
72 | * to "no". */ | |
73 | ||
74 | s = address_family_boolean_from_string(rvalue); | |
75 | if (s < 0) { | |
76 | if (streq(rvalue, "kernel")) | |
77 | s = ADDRESS_FAMILY_NO; | |
78 | else { | |
79 | log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPForward= option, ignoring: %s", rvalue); | |
80 | return 0; | |
81 | } | |
82 | } | |
83 | ||
84 | *fwd = s; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Router lifetime can be set with netlink interface since kernel >= 4.5 | |
90 | * so for the supported kernel we dont need to expire routes in userspace */ | |
91 | int kernel_route_expiration_supported(void) { | |
92 | static int cached = -1; | |
93 | int r; | |
94 | ||
95 | if (cached < 0) { | |
96 | Condition c = { | |
97 | .type = CONDITION_KERNEL_VERSION, | |
98 | .parameter = (char *) ">= 4.5" | |
99 | }; | |
100 | r = condition_test(&c); | |
101 | if (r < 0) | |
102 | return r; | |
103 | ||
104 | cached = r; | |
105 | } | |
106 | return cached; | |
107 | } |