Function fill_addrinfo

lib/ff_route.c:505–584

* Fills in @info based on userland-provided @rtm message. * * Returns 0 on success. */

 * Returns 0 on success.
 */
static int
fill_addrinfo(struct rt_msghdr *rtm, int len, u_int fibnum, struct rt_addrinfo *info)
{
    int error;
    sa_family_t saf;

    rtm->rtm_pid = curproc->p_pid;
    info->rti_addrs = rtm->rtm_addrs;

    info->rti_mflags = rtm->rtm_inits;
    info->rti_rmx = &rtm->rtm_rmx;

    /*
     * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
     * link-local address because rtrequest requires addresses with
     * embedded scope id.
     */
    if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, info))
        return (EINVAL);

    if (rtm->rtm_flags & RTF_RNH_LOCKED)
        return (EINVAL);
    info->rti_flags = rtm->rtm_flags;
    error = cleanup_xaddrs(info);
    if (error != 0)
        return (error);
    saf = info->rti_info[RTAX_DST]->sa_family;
    /*
     * Verify that the caller has the appropriate privilege; RTM_GET
     * is the only operation the non-superuser is allowed.
     */
    if (rtm->rtm_type != RTM_GET) {
        error = priv_check(curthread, PRIV_NET_ROUTE);
        if (error != 0)
            return (error);
    }

    /*
     * The given gateway address may be an interface address.
     * For example, issuing a "route change" command on a route
     * entry that was created from a tunnel, and the gateway
     * address given is the local end point. In this case the 
     * RTF_GATEWAY flag must be cleared or the destination will
     * not be reachable even though there is no error message.
     */
    if (info->rti_info[RTAX_GATEWAY] != NULL &&
        info->rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
        struct rt_addrinfo ginfo;
        struct sockaddr *gdst;
        struct sockaddr_storage ss;

        bzero(&ginfo, sizeof(ginfo));
        bzero(&ss, sizeof(ss));
        ss.ss_len = sizeof(ss);

        ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
        gdst = info->rti_info[RTAX_GATEWAY];