net: hsr: emit RedBox-MAC TLV in PRP RedBox supervision frames

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A PRP RedBox must announce the SANs it proxies so peers populate their
proxy node tables. The proxy-announce machinery (hsr_proxy_announce(),
armed via hsr->redbox) already iterates proxy_node_db under RCU and calls
send_sv_frame() once per SAN, but the PRP sender emitted neither the
announced SAN MAC nor the RedBox-MAC TLV that IEC 62439-3 requires.

Extend send_prp_supervision_frame() so that, for a proxy-announce
(identified by the interlink port, an O(1) test), the frame carries the
proxied SAN MAC as MacAddressA followed by the RedBox-MAC TLV (Type 30)
and an explicit End-of-TLV marker before padding.

hsr_get_node() must also accept the reinjected proxy-announce: a PRP
supervision frame is an untagged ETH_P_PRP frame (mac_len == ETH_HLEN, the
RCT is appended only on egress) sourced from macaddress_redbox, which is
never learned from data. Exempt only PRP supervision frames from the
hsr_ethhdr length guard; HSR (ETH_P_HSR) supervision is front-tagged and
keeps the original guard, so HSR malformed-frame filtering is unchanged.

Also align macaddress_redbox so that ether_addr_copy() and
ether_addr_equal() on it are safe on architectures without efficient
unaligned access.

Signed-off-by: Xin Xie <xiexinet@gmail.com>
Link: https://patch.msgid.link/20260717201457.54-3-xiexinet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Xin Xie 2026-07-17 22:14:55 +02:00 • committed by Jakub Kicinski

parent 841afc9143

commit 852c6a8d7c

3 changed files with 42 additions and 6 deletions

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33

net/hsr/hsr_device.c

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13

net/hsr/hsr_framereg.c

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2

net/hsr/hsr_main.h

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