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llc: move the type 2 sockets out of tree

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802.2 LLC is only used in tree by protocols which need the
connectionless type 1 subset: STP, which carries the bridge's BPDUs,
GARP, which sends its own UI PDUs, and SNAP. The llc2 module on top of
the core - the type 2 connection state machine, the type 1 SAP state
machine, the station component and the PF_LLC socket family - has no
in-kernel users and nobody who can test it; what we get instead is a
slow trickle of drive-by fixes.

There was a recent patch from Ernestas Kulik indicating potential
real life use, but it was new/experimental and that person is
not responding to off-list pings.

Let LLC2 follow AX.25, hamradio and AppleTalk out of the Linux tree.
We will maintain the code at: github.com/linux-netdev/mod-orphan
for anyone interested in playing with it.

PF_LLC goes in full, both the class two SOCK_STREAM and the class one
SOCK_DGRAM half, and so do /proc/net/llc/ and /proc/sys/net/llc/. Note
that the kernel also stops answering XID and TEST commands, addressed
to a SAP or to the station - those are type 1, but they lived in the
module, and they got answered whether or not any socket was open.
Nothing in tree asks for them; what the core keeps is SAP registration
and the UI path the in-tree users need.

Retain the uAPI for now, like we did for AppleTalk. Only the socket ABI
half of it is vestigial: STP, GARP, the bridge and openvswitch use the
SAP numbers it defines. Cleaning up what the core no longer needs
follows in the next patch.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20260928190800.2521749-2-kuba@kernel.org
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2026-09-28 12:07:58 -07:00 • committed by Paolo Abeni
commit 003f21868b
34 changed files with 1 additions and 12183 deletions
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