accept_source_route

file: /proc/sys/net/ipv6/conf/interface/accept_source_route
variable: net.ipv6.conf.interface.accept_source_route
Official reference

Accept source routing (routing extension header).

= 0: Accept only routing header type 2. < 0: Do not accept routing header.

Default: 0

Nb: per interface setting (where “interface” is the name of your network interface); “all” is a special interface: changes the settings for all interfaces.

source