How can I disable IPv6 ping responses in Linux without using the IPv6 firewall?

This question covers how to do this using the IPv6 firewall via iptables, but I'm using an embedded system that doesn't currently have firewall support, so I need an alternate method.

I'm able to disable IPv4 ping response by simply setting /proc/sys/net/ipv4/icmp_echo_ignore_all from 0 to 1. Is there something like this for IPv6?

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