dccp_ioctl 302 net/dccp/dccp.h extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); dccp_ioctl 925 net/dccp/ipv4.c .ioctl = dccp_ioctl, dccp_ioctl 1125 net/dccp/ipv6.c .ioctl = dccp_ioctl,