sd_icmp6_nd_set_callback 1245 src/network/networkd-link.c                 r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
sd_icmp6_nd_set_callback   41 src/systemd/sd-icmp6-nd.h int sd_icmp6_nd_set_callback(sd_icmp6_nd *nd, sd_icmp6_nd_callback_t cb,