ipv6_dup_options  227 include/net/ipv6.h extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
ipv6_dup_options  629 net/dccp/ipv6.c 		newnp->opt = ipv6_dup_options(newsk, opt);
ipv6_dup_options 1382 net/ipv6/tcp_ipv6.c 		newnp->opt = ipv6_dup_options(newsk, opt);