inet6_opt_init.3n (2010 09)

inet6_opt_init(3N) inet6_opt_init(3N)

int on = 1;

setsockopt(fd, IPPROTO_IPV6, IPV6_RECVDSTOPTS, &on, sizeof(on));

To receive Destination options appearing before a Routing header, the application must enable the

IPV6_RECVRTHDRDSTOPTS

socket option:

int on = 1;

setsockopt(fd, IPPROTO_IPV6, IPV6_RECVRTHDRDSTOPTS, &on, sizeof(on));

To send a Destination options header, the application speciﬁes it either as ancillary data in a call to

sendmsg() or using setsockopt().

The application can remove any sticky Destination extension header by calling

setsockopt() for

IPV6_RTHDRDSTOPTS

/IPV6_DSTOPTS with a zero option length.

RETURN VALUE

inet6_opt_init()

, inet6_opt_append()

, inet6_opt_finish()

, inet6_opt_next()

, and

inet6_opt_find()

return -1 on an error.

EXAMPLES

RFC 3542 gives a comprehensive example in Appendix C.