Extern or forward variable declaration at include/linux/inet_diag.h, line 45 References: net/ipv4/inet_diag.c, line 234 net/ipv4/tcp.c, line 412 net/ipv4/tcp.c, line 1548 net/ipv4/tcp.c, line 2981 net/ipv4/tcp.c, line 3391 net/ipv4/tcp.c, line 3693 net/ipv4/tcp.c, line 3725 net/ipv4/tcp.c, line 3953 net/ipv4/tcp.c, line 4292 net/ipv4/tcp_nv.c, line 241 net/tls/tls_main.c, line 301 net/tls/tls_main.c, line 712