Function rip6_output

freebsd/netinet6/raw_ip6.c:391–576

* Generate IPv6 header and pass packet to ip6_output. Tack on options user * may have setup with control call. */

 * may have setup with control call.
 */
int
rip6_output(struct mbuf *m, struct socket *so, ...)
{
	struct epoch_tracker et;
	struct mbuf *control;
	struct m_tag *mtag;
	struct sockaddr_in6 *dstsock;
	struct ip6_hdr *ip6;
	struct inpcb *inp;
	u_int	plen = m->m_pkthdr.len;
	int error = 0;
	struct ip6_pktopts opt, *optp;
	struct ifnet *oifp = NULL;
	int type = 0, code = 0;		/* for ICMPv6 output statistics only */
	int scope_ambiguous = 0;
	int use_defzone = 0;
	int hlim = 0;
	struct in6_addr in6a;
	va_list ap;

	va_start(ap, so);
	dstsock = va_arg(ap, struct sockaddr_in6 *);
	control = va_arg(ap, struct mbuf *);
	va_end(ap);

	inp = sotoinpcb(so);
	INP_WLOCK(inp);

	if (control != NULL) {
		if ((error = ip6_setpktopts(control, &opt,
		    inp->in6p_outputopts, so->so_cred,
		    so->so_proto->pr_protocol)) != 0) {
			goto bad;
		}
		optp = &opt;
	} else
		optp = inp->in6p_outputopts;

	/*
	 * Check and convert scope zone ID into internal form.
	 *
	 * XXX: we may still need to determine the zone later.
	 */
	if (!(so->so_state & SS_ISCONNECTED)) {
		if (!optp || !optp->ip6po_pktinfo ||
		    !optp->ip6po_pktinfo->ipi6_ifindex)
			use_defzone = V_ip6_use_defzone;
		if (dstsock->sin6_scope_id == 0 && !use_defzone)
			scope_ambiguous = 1;
		if ((error = sa6_embedscope(dstsock, use_defzone)) != 0)
			goto bad;
	}

	/*
	 * For an ICMPv6 packet, we should know its type and code to update
	 * statistics.
	 */
	if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) {