ip6_ra_chain
struct ip6_ra_chain *next;
extern struct ip6_ra_chain *ip6_ra_chain;
struct ip6_ra_chain *ra;
for (ra = ip6_ra_chain; ra; ra = ra->next) {
struct ip6_ra_chain *ip6_ra_chain;
struct ip6_ra_chain *ra, *new_ra, **rap;
for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {