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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 TG |
22 | |
23 | #include "sd-id128.h" | |
24 | #include "libudev.h" | |
25 | #include "udev-util.h" | |
26 | ||
27 | #include "virt.h" | |
28 | #include "sparse-endian.h" | |
29 | #include "siphash24.h" | |
cfb5b380 TG |
30 | |
31 | #include "dhcp6-protocol.h" | |
32 | #include "dhcp-identifier.h" | |
33 | #include "network-internal.h" | |
34 | ||
35 | #define SYSTEMD_PEN 43793 | |
36 | #define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09) | |
37 | ||
38 | int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) { | |
39 | sd_id128_t machine_id; | |
40 | int r; | |
41 | ||
42 | assert(duid); | |
43 | assert(len); | |
44 | ||
45 | r = sd_id128_get_machine(&machine_id); | |
46 | if (r < 0) | |
47 | return r; | |
48 | ||
9ee18af3 TG |
49 | unaligned_write_be16(&duid->type, DHCP6_DUID_EN); |
50 | unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN); | |
51 | ||
cfb5b380 TG |
52 | *len = sizeof(duid->type) + sizeof(duid->en); |
53 | ||
54 | /* a bit of snake-oil perhaps, but no need to expose the machine-id | |
55 | directly */ | |
56 | siphash24(duid->en.id, &machine_id, sizeof(machine_id), HASH_KEY.bytes); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
61 | ||
9ee18af3 | 62 | int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id) { |
cfb5b380 TG |
63 | /* name is a pointer to memory in the udev_device struct, so must |
64 | have the same scope */ | |
65 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; | |
66 | const char *name = NULL; | |
67 | uint64_t id; | |
68 | ||
69 | if (detect_container(NULL) <= 0) { | |
70 | /* not in a container, udev will be around */ | |
71 | _cleanup_udev_unref_ struct udev *udev; | |
72 | char ifindex_str[2 + DECIMAL_STR_MAX(int)]; | |
73 | ||
74 | udev = udev_new(); | |
75 | if (!udev) | |
76 | return -ENOMEM; | |
77 | ||
78 | sprintf(ifindex_str, "n%d", ifindex); | |
79 | device = udev_device_new_from_device_id(udev, ifindex_str); | |
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80 | if (device) { |
81 | if (udev_device_get_is_initialized(device) <= 0) | |
82 | /* not yet ready */ | |
83 | return -EBUSY; | |
cfb5b380 | 84 | |
40862866 TG |
85 | name = net_get_name(device); |
86 | } | |
cfb5b380 TG |
87 | } |
88 | ||
89 | if (name) | |
90 | siphash24((uint8_t*)&id, name, strlen(name), HASH_KEY.bytes); | |
91 | else | |
e2acdb6b | 92 | /* fall back to MAC address if no predictable name available */ |
cfb5b380 TG |
93 | siphash24((uint8_t*)&id, mac, mac_len, HASH_KEY.bytes); |
94 | ||
95 | /* fold into 32 bits */ | |
9ee18af3 | 96 | unaligned_write_be32(_id, (id & 0xffffffff) ^ (id >> 32)); |
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97 | |
98 | return 0; | |
99 | } |