Function prototype or declaration at include/net/ipv6.h, line 816 References: drivers/infiniband/core/addr.c, line 441 drivers/net/ethernet/mellanox/mlx5/core/en/tc_tun.c, line 437 drivers/net/ethernet/netronome/nfp/flower/action.c, line 451 drivers/net/geneve.c, line 1043 drivers/net/vxlan.c, line 2808 drivers/net/wireguard/socket.c, line 153 include/net/ipv6.h, line 816 include/net/ipv6.h, line 828 net/ipv6/ip6_output.c, line 289 net/ipv6/ip6_tunnel.c, line 1232 net/ipv6/ipv6_sockglue.c, line 1345 net/ipv6/netfilter/nf_reject_ipv6.c, line 344 net/ipv6/output_core.c, line 128 net/ipv6/output_core.c, line 145 net/ipv6/seg6_iptunnel.c, line 160 net/sctp/ipv6.c, line 240 net/tipc/udp_media.c, line 216 net/xfrm/xfrm_output.c, line 271