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cfb5b380 TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
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 | ||
cfb5b380 | 22 | #include "libudev.h" |
07630cea | 23 | #include "sd-id128.h" |
cfb5b380 | 24 | |
cfb5b380 | 25 | #include "dhcp-identifier.h" |
07630cea | 26 | #include "dhcp6-protocol.h" |
cfb5b380 | 27 | #include "network-internal.h" |
07630cea LP |
28 | #include "siphash24.h" |
29 | #include "sparse-endian.h" | |
30 | #include "udev-util.h" | |
31 | #include "virt.h" | |
cfb5b380 TG |
32 | |
33 | #define SYSTEMD_PEN 43793 | |
34 | #define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09) | |
35 | ||
36 | int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) { | |
37 | sd_id128_t machine_id; | |
38 | int r; | |
39 | ||
40 | assert(duid); | |
41 | assert(len); | |
42 | ||
43 | r = sd_id128_get_machine(&machine_id); | |
44 | if (r < 0) | |
45 | return r; | |
46 | ||
9ee18af3 TG |
47 | unaligned_write_be16(&duid->type, DHCP6_DUID_EN); |
48 | unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN); | |
49 | ||
cfb5b380 TG |
50 | *len = sizeof(duid->type) + sizeof(duid->en); |
51 | ||
52 | /* a bit of snake-oil perhaps, but no need to expose the machine-id | |
53 | directly */ | |
54 | siphash24(duid->en.id, &machine_id, sizeof(machine_id), HASH_KEY.bytes); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
9ee18af3 | 59 | int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id) { |
cfb5b380 TG |
60 | /* name is a pointer to memory in the udev_device struct, so must |
61 | have the same scope */ | |
62 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
63 | const char *name = NULL; | |
64 | uint64_t id; | |
65 | ||
75f86906 | 66 | if (detect_container() <= 0) { |
cfb5b380 TG |
67 | /* not in a container, udev will be around */ |
68 | _cleanup_udev_unref_ struct udev *udev; | |
69 | char ifindex_str[2 + DECIMAL_STR_MAX(int)]; | |
70 | ||
71 | udev = udev_new(); | |
72 | if (!udev) | |
73 | return -ENOMEM; | |
74 | ||
75 | sprintf(ifindex_str, "n%d", ifindex); | |
76 | device = udev_device_new_from_device_id(udev, ifindex_str); | |
40862866 TG |
77 | if (device) { |
78 | if (udev_device_get_is_initialized(device) <= 0) | |
79 | /* not yet ready */ | |
80 | return -EBUSY; | |
cfb5b380 | 81 | |
40862866 TG |
82 | name = net_get_name(device); |
83 | } | |
cfb5b380 TG |
84 | } |
85 | ||
86 | if (name) | |
87 | siphash24((uint8_t*)&id, name, strlen(name), HASH_KEY.bytes); | |
88 | else | |
e2acdb6b | 89 | /* fall back to MAC address if no predictable name available */ |
cfb5b380 TG |
90 | siphash24((uint8_t*)&id, mac, mac_len, HASH_KEY.bytes); |
91 | ||
92 | /* fold into 32 bits */ | |
9ee18af3 | 93 | unaligned_write_be32(_id, (id & 0xffffffff) ^ (id >> 32)); |
cfb5b380 TG |
94 | |
95 | return 0; | |
96 | } |