toggling promiscuous mode logging on NICs

[Julien Benoist]

This is a patch allowing to control kernel logging of promiscuous mode changes 
on network interfaces through sysctl (enabled by default) :
        kern.log_promisc=1

I dont know if this mib should be placed somewhere else, nor if the feature 
itself could interest anyone... Patch attached anyway.

-- 
Julien Benoist


--- /usr/src.old/sys/net/if.c	Sun Apr 28 07:40:25 2002
+++ /usr/src/sys/net/if.c	Thu Aug 29 03:52:06 2002
@@ -80,6 +80,10 @@
 static void if_slowtimo __P((void *));
 static void link_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
 static int  if_rtdel __P((struct radix_node *, void *));
+static int log_promisc = 1;
+
+SYSCTL_INT(_kern, OID_AUTO, log_promisc, CTLFLAG_RW,
+	   &log_promisc, 0 , "toggle promiscuity mode");
 
 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
 
@@ -1245,14 +1249,18 @@
 		if (ifp->if_pcount++ != 0)
 			return (0);
 		ifp->if_flags |= IFF_PROMISC;
-		log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
-		    ifp->if_name, ifp->if_unit);
+		if (log_promisc==1) {
+			log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
+		    	    ifp->if_name, ifp->if_unit);
+		}
 	} else {
 		if (--ifp->if_pcount > 0)
 			return (0);
 		ifp->if_flags &= ~IFF_PROMISC;
-		log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
-		    ifp->if_name, ifp->if_unit);
+		if (log_promisc==1) {
+			log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
+		    	    ifp->if_name, ifp->if_unit);
+		}
 	}
 	ifr.ifr_flags = ifp->if_flags;
 	error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);