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764aad62 TG |
1 | #pragma once |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright (C) 2015 Tom Gundersen <teg@jklmen> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
07630cea | 22 | #include "sd-id128.h" |
764aad62 | 23 | |
c1ff5570 | 24 | #include "macro.h" |
764aad62 | 25 | #include "sparse-endian.h" |
9ee18af3 | 26 | #include "unaligned.h" |
764aad62 | 27 | |
413708d1 VK |
28 | typedef enum DUIDType { |
29 | DUID_TYPE_RAW = 0, | |
30 | DUID_TYPE_LLT = 1, | |
31 | DUID_TYPE_EN = 2, | |
32 | DUID_TYPE_LL = 3, | |
33 | DUID_TYPE_UUID = 4, | |
34 | _DUID_TYPE_MAX, | |
35 | _DUID_TYPE_INVALID = -1, | |
36 | } DUIDType; | |
37 | ||
764aad62 TG |
38 | /* RFC 3315 section 9.1: |
39 | * A DUID can be no more than 128 octets long (not including the type code). | |
40 | */ | |
41 | #define MAX_DUID_LEN 128 | |
42 | ||
43 | struct duid { | |
413708d1 | 44 | be16_t type; |
764aad62 TG |
45 | union { |
46 | struct { | |
47 | /* DHCP6_DUID_LLT */ | |
48 | uint16_t htype; | |
49 | uint32_t time; | |
50 | uint8_t haddr[0]; | |
51 | } _packed_ llt; | |
52 | struct { | |
53 | /* DHCP6_DUID_EN */ | |
54 | uint32_t pen; | |
55 | uint8_t id[8]; | |
56 | } _packed_ en; | |
57 | struct { | |
58 | /* DHCP6_DUID_LL */ | |
59 | int16_t htype; | |
60 | uint8_t haddr[0]; | |
61 | } _packed_ ll; | |
62 | struct { | |
63 | /* DHCP6_DUID_UUID */ | |
64 | sd_id128_t uuid; | |
65 | } _packed_ uuid; | |
66 | struct { | |
67 | uint8_t data[MAX_DUID_LEN]; | |
68 | } _packed_ raw; | |
69 | }; | |
70 | } _packed_; | |
cfb5b380 TG |
71 | |
72 | int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len); | |
9ee18af3 | 73 | int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id); |
413708d1 VK |
74 | |
75 | static inline int dhcp_validate_duid_len(uint16_t duid_type, size_t duid_len) { | |
76 | struct duid d; | |
77 | ||
7908dd67 | 78 | assert(duid_len > 0); |
413708d1 VK |
79 | |
80 | switch (duid_type) { | |
81 | case DUID_TYPE_LLT: | |
82 | if (duid_len <= sizeof(d.llt)) | |
83 | return -EINVAL; | |
84 | break; | |
85 | case DUID_TYPE_EN: | |
86 | if (duid_len != sizeof(d.en)) | |
87 | return -EINVAL; | |
88 | break; | |
89 | case DUID_TYPE_LL: | |
90 | if (duid_len <= sizeof(d.ll)) | |
91 | return -EINVAL; | |
92 | break; | |
93 | case DUID_TYPE_UUID: | |
94 | if (duid_len != sizeof(d.uuid)) | |
95 | return -EINVAL; | |
96 | break; | |
97 | default: | |
7908dd67 TH |
98 | if (duid_len > sizeof(d.raw)) |
99 | return -EINVAL; | |
413708d1 VK |
100 | /* accept unknown type in order to be forward compatible */ |
101 | break; | |
102 | } | |
103 | return 0; | |
104 | } |