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network: include SSID in ipv6 stable prefix address generation

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The SSID fills the role of the optional Network_ID input parameter
suggested by RFC7217. Including the SSID allows networkd to generate a
different pseudorandom address for different wireless networks, which
should help to obscure the host's identity when roaming between multiple
networks.
This commit is contained in:
Ronan Pigott 2023-10-13 20:22:49 -07:00 committed by Yu Watanabe
parent a3ad5c3140
commit 06960d1719
2 changed files with 10 additions and 0 deletions
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6
NEWS
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@ -67,6 +67,12 @@ CHANGES WITH 255 in spe:
It is now enabled by default and is part of the new "v255" naming
scheme.
* The 'prefixstable' ipv6 address generation mode now considers the
SSID when genrating stable addresses, so that a different stable
address is used when roaming between wireless networks. If you
already use 'prefixstable' addresses with wireless networks, the
stable address chosen will be changed by the update.
Changes in systemd-analyze:
* "systemd-analyze plot" has gained tooltips on each unit name with

4
src/network/networkd-address-generation.c
View file

@ -117,6 +117,10 @@ static void generate_stable_private_address_one(
siphash24_compress(&link->hw_addr.infiniband[INFINIBAND_ALEN - 8], 8, &state);
else
siphash24_compress(link->hw_addr.bytes, link->hw_addr.length, &state);
if (link->ssid)
siphash24_compress_string(link->ssid, &state);
siphash24_compress(&dad_counter, sizeof(uint8_t), &state);
rid = htole64(siphash24_finalize(&state));