Function rt_ieee80211msg

freebsd/net/rtsock.c:2014–2047

* This is called to generate routing socket messages indicating * IEEE80211 wireless events. * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way. */

 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
 */
void
rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
{
	struct mbuf *m;
	struct rt_addrinfo info;

	m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
	if (m != NULL) {
		/*
		 * Append the ieee80211 data.  Try to stick it in the
		 * mbuf containing the ifannounce msg; otherwise allocate
		 * a new mbuf and append.
		 *
		 * NB: we assume m is a single mbuf.
		 */
		if (data_len > M_TRAILINGSPACE(m)) {
			struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
			if (n == NULL) {
				m_freem(m);
				return;
			}
			bcopy(data, mtod(n, void *), data_len);
			n->m_len = data_len;
			m->m_next = n;
		} else if (data_len > 0) {
			bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
			m->m_len += data_len;
		}
		if (m->m_flags & M_PKTHDR)
			m->m_pkthdr.len += data_len;
		mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
		rt_dispatch(m, AF_UNSPEC);
	}
}

/*
 * This is called to generate routing socket messages indicating