From 4be594580c78edc884354b2cb90970b7d427063f Mon Sep 17 00:00:00 2001
From: sam <sam@FreeBSD.org>
Date: Tue, 5 Oct 2004 19:48:33 +0000
Subject: Add 802.11-specific events that are dispatched through the routing
 socket. This really doesn't belong here but is preferred (for the moment)
 over adding yet another mechanism for sending msgs from the kernel to user
 apps.

Reviewed by:	imp
---
 sys/net/rtsock.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 66 insertions(+), 13 deletions(-)

(limited to 'sys/net/rtsock.c')

diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 8616e23..ec1ba1d 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -675,6 +675,7 @@ rt_msg1(int type, struct rt_addrinfo *rtinfo)
 		break;
 
 	case RTM_IFANNOUNCE:
+	case RTM_IEEE80211:
 		len = sizeof(struct if_announcemsghdr);
 		break;
 
@@ -932,6 +933,67 @@ rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
 	rt_dispatch(m, ifma->ifma_addr);
 }
 
+static struct mbuf *
+rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
+	struct rt_addrinfo *info)
+{
+	struct if_announcemsghdr *ifan;
+	struct mbuf *m;
+
+	if (route_cb.any_count == 0)
+		return NULL;
+	bzero((caddr_t)info, sizeof(*info));
+	m = rt_msg1(type, info);
+	if (m != NULL) {
+		ifan = mtod(m, struct if_announcemsghdr *);
+		ifan->ifan_index = ifp->if_index;
+		strlcpy(ifan->ifan_name, ifp->if_xname,
+			sizeof(ifan->ifan_name));
+		ifan->ifan_what = what;
+	}
+	return m;
+}
+
+/*
+ * 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.
+ */
+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, NULL);
+	}
+}
+
 /*
  * This is called to generate routing socket messages indicating
  * network interface arrival and departure.
@@ -939,22 +1001,13 @@ rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
 void
 rt_ifannouncemsg(struct ifnet *ifp, int what)
 {
-	struct if_announcemsghdr *ifan;
 	struct mbuf *m;
 	struct rt_addrinfo info;
 
-	if (route_cb.any_count == 0)
-		return;
-	bzero((caddr_t)&info, sizeof(info));
-	m = rt_msg1(RTM_IFANNOUNCE, &info);
-	if (m == NULL)
-		return;
-	ifan = mtod(m, struct if_announcemsghdr *);
-	ifan->ifan_index = ifp->if_index;
-	strlcpy(ifan->ifan_name, ifp->if_xname, sizeof(ifan->ifan_name));
-	ifan->ifan_what = what;
-	rt_dispatch(m, NULL);
- }
+	m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
+	if (m != NULL)
+		rt_dispatch(m, NULL);
+}
 
 static void
 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
-- 
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