[PATCH] BSD: Add support for route(4) message filtering.

[Roy Marples <roy@xxxxxxxxxxxx>]

    hostap is only interested in RTM_IEEE80211.
    wpa_supplicant is only interested in RTM_IEEE80211, RTM_IFINFO and
    RTM_IFANNOUNCE.

    This supports the NetBSD RO_MSGFILTER interface and the alternative
    DragonFlyBSD/OpenBSD interface ROUTE_MSGFILTER.

    Signed-off-by: Roy Marples <roy@xxxxxxxxxxxx>

diff --git a/src/drivers/driver_bsd.c b/src/drivers/driver_bsd.c
index 82ca0612e..8667ee519 100644
--- a/src/drivers/driver_bsd.c
+++ b/src/drivers/driver_bsd.c
@@ -1661,6 +1661,17 @@ static void *
 bsd_global_init(void *ctx)
 {
 	struct bsd_driver_global *global;
+#if defined(RO_MSGFILTER) || defined(ROUTE_MSGFILTER)
+	unsigned char msgfilter[] = {
+		RTM_IEEE80211,
+#ifndef HOSTAPD
+		RTM_IFINFO, RTM_IFANNOUNCE,
+#endif
+	};
+#endif
+#ifdef ROUTE_MSGFILTER
+	unsigned int i, msgfilter_mask;
+#endif

 	global = os_zalloc(sizeof(*global));
 	if (global == NULL)
@@ -1683,6 +1694,21 @@ bsd_global_init(void *ctx)
 		goto fail;
 	}

+#if defined(RO_MSGFILTER)
+	if (setsockopt(global->route, PF_ROUTE, RO_MSGFILTER,
+	    &msgfilter, sizeof(msgfilter)) < 0)
+		wpa_printf(MSG_ERROR, "socket[PF_ROUTE,RO_MSGFILTER]: %s",
+			   strerror(errno));
+#elif defined(ROUTE_MSGFILTER)
+	msgfilter_mask = 0;
+	for (i = 0; i < (sizeof(msgfilter) / sizeof(msgfilter[0])); i++)
+		msgfilter_mask |= ROUTE_FILTER(msgfilter[i]);
+	if (setsockopt(global->route, PF_ROUTE, ROUTE_MSGFILTER,
+	    &msgfilter_mask, sizeof(msgfilter_mask)) < 0)
+		wpa_printf(MSG_ERROR, "socket[PF_ROUTE,ROUTE_MSGFILTER]: %s",
+			   strerror(errno));
+#endif
+
 	global->event_buf_len = rtbuf_len();
 	global->event_buf = os_malloc(global->event_buf_len);
 	if (global->event_buf == NULL) {

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