99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/***
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This file is part of systemd.
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Copyright (C) 2015 Tom Gundersen <teg@jklmen>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "libudev.h"
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#include "sd-id128.h"
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#include "dhcp-identifier.h"
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#include "dhcp6-protocol.h"
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#include "network-internal.h"
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#include "siphash24.h"
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#include "sparse-endian.h"
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#include "udev-util.h"
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#include "virt.h"
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#define SYSTEMD_PEN 43793
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#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
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int dhcp_identifier_set_duid_en(struct duid *duid, size_t *len) {
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sd_id128_t machine_id;
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uint64_t hash;
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int r;
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assert(duid);
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assert(len);
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r = sd_id128_get_machine(&machine_id);
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if (r < 0)
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return r;
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unaligned_write_be16(&duid->type, DUID_TYPE_EN);
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unaligned_write_be32(&duid->en.pen, SYSTEMD_PEN);
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*len = sizeof(duid->type) + sizeof(duid->en);
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/* a bit of snake-oil perhaps, but no need to expose the machine-id
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directly; duid->en.id might not be aligned, so we need to copy */
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hash = htole64(siphash24(&machine_id, sizeof(machine_id), HASH_KEY.bytes));
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memcpy(duid->en.id, &hash, sizeof(duid->en.id));
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return 0;
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}
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int dhcp_identifier_set_iaid(int ifindex, uint8_t *mac, size_t mac_len, void *_id) {
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/* name is a pointer to memory in the udev_device struct, so must
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have the same scope */
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_cleanup_udev_device_unref_ struct udev_device *device = NULL;
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const char *name = NULL;
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uint64_t id;
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if (detect_container() <= 0) {
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/* not in a container, udev will be around */
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_cleanup_udev_unref_ struct udev *udev;
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char ifindex_str[2 + DECIMAL_STR_MAX(int)];
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udev = udev_new();
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if (!udev)
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return -ENOMEM;
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sprintf(ifindex_str, "n%d", ifindex);
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device = udev_device_new_from_device_id(udev, ifindex_str);
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if (device) {
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if (udev_device_get_is_initialized(device) <= 0)
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/* not yet ready */
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return -EBUSY;
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name = net_get_name(device);
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}
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}
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if (name)
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id = siphash24(name, strlen(name), HASH_KEY.bytes);
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else
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/* fall back to MAC address if no predictable name available */
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id = siphash24(mac, mac_len, HASH_KEY.bytes);
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id = htole64(id);
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/* fold into 32 bits */
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unaligned_write_be32(_id, (id & 0xffffffff) ^ (id >> 32));
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return 0;
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}
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