Divorce the kernel binary ABI version number from the message

format version number. (userland programs should not need to be
recompiled when the netgraph kernel internal ABI is changed.

Also fix modules that don;t handle the fact that a caller may not supply
a return message pointer. (benign at the moment because the calling code
checks, but that will change)

2 files changed, 62 insertions, 66 deletions

diff --git a/sys/dev/ar/if_ar.c b/sys/dev/ar/if_ar.c
index ad5aac9..fe9abeb 100644
--- a/sys/dev/ar/if_ar.c
+++ b/sys/dev/ar/if_ar.c
@@ -275,7 +275,7 @@ static ng_rcvdata_t	ngar_rcvdata;
 static ng_disconnect_t	ngar_disconnect;
 	
 static struct ng_type typestruct = {
-	NG_VERSION,
+	NG_ABI_VERSION,
 	NG_AR_NODE_TYPE,
 	NULL,
 	ngar_constructor,
@@ -2216,66 +2216,64 @@ ngar_newhook(node_p node, hook_p hook, const char *name)
  * Just respond to the generic TEXT_STATUS message
  */
 static	int
-ngar_rcvmsg(node_p node, struct ng_mesg *msg,
-		const char *retaddr, struct ng_mesg **resp, hook_p lasthook)
+ngar_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
+				struct ng_mesg **rptr, hook_p lasthook)
 {
 	struct ar_softc *	sc;
+	struct ng_mesg *resp = NULL;
 	int error = 0;
 
 	sc = node->private;
 	switch (msg->header.typecookie) {
-	    case	NG_AR_COOKIE: 
+	case	NG_AR_COOKIE: 
 		error = EINVAL;
 		break;
-	    case	NGM_GENERIC_COOKIE: 
+	case	NGM_GENERIC_COOKIE: 
 		switch(msg->header.cmd) {
-		    case NGM_TEXT_STATUS: {
-			    char	*arg;
-			    int pos = 0;
-			    int resplen = sizeof(struct ng_mesg) + 512;
-			    MALLOC(*resp, struct ng_mesg *, resplen,
-					M_NETGRAPH, M_NOWAIT | M_ZERO);
-			    if (*resp == NULL) { 
+		case NGM_TEXT_STATUS: {
+			char        *arg;
+			int pos = 0;
+
+			int resplen = sizeof(struct ng_mesg) + 512;
+			NG_MKRESPONSE(resp, msg, resplen, M_NOWAIT);
+			if (resp == NULL) {
 				error = ENOMEM;
 				break;
-			    }       
-			    arg = (*resp)->data;
-
-			    /*
-			     * Put in the throughput information.
-			     */
-			    pos = sprintf(arg, "%ld bytes in, %ld bytes out\n"
+			}
+			arg = (resp)->data;
+			pos = sprintf(arg, "%ld bytes in, %ld bytes out\n"
 			    "highest rate seen: %ld B/S in, %ld B/S out\n",
-			    sc->inbytes, sc->outbytes,
-			    sc->inrate, sc->outrate);
-			    pos += sprintf(arg + pos,
+			sc->inbytes, sc->outbytes,
+			sc->inrate, sc->outrate);
+			pos += sprintf(arg + pos,
 				"%ld output errors\n",
 			    	sc->oerrors);
-			    pos += sprintf(arg + pos,
+			pos += sprintf(arg + pos,
 				"ierrors = %ld, %ld, %ld, %ld\n",
 			    	sc->ierrors[0],
 			    	sc->ierrors[1],
 			    	sc->ierrors[2],
 			    	sc->ierrors[3]);
 
-			    (*resp)->header.version = NG_VERSION;
-			    (*resp)->header.arglen = strlen(arg) + 1;
-			    (*resp)->header.token = msg->header.token;
-			    (*resp)->header.typecookie = NG_AR_COOKIE;
-			    (*resp)->header.cmd = msg->header.cmd;
-			    strncpy((*resp)->header.cmdstr, "status",
-					NG_CMDSTRLEN);
-			}
+			resp->header.arglen = pos + 1;
 			break;
-	    	    default:
+		      }
+		default:
 		 	error = EINVAL;
 		 	break;
 		    }
 		break;
-	    default:
+	default:
 		error = EINVAL;
 		break;
 	}
+	/* Take care of synchronous response, if any */
+	if (rptr)
+		*rptr = resp;
+	else if (resp)
+		/* Should send the hard way */
+		FREE(resp, M_NETGRAPH);
+
 	free(msg, M_NETGRAPH);
 	return (error);
 }
diff --git a/sys/dev/ar/if_ar_isa.c b/sys/dev/ar/if_ar_isa.c
index ad5aac9..fe9abeb 100644
--- a/sys/dev/ar/if_ar_isa.c
+++ b/sys/dev/ar/if_ar_isa.c
@@ -275,7 +275,7 @@ static ng_rcvdata_t	ngar_rcvdata;
 static ng_disconnect_t	ngar_disconnect;
 	
 static struct ng_type typestruct = {
-	NG_VERSION,
+	NG_ABI_VERSION,
 	NG_AR_NODE_TYPE,
 	NULL,
 	ngar_constructor,
@@ -2216,66 +2216,64 @@ ngar_newhook(node_p node, hook_p hook, const char *name)
  * Just respond to the generic TEXT_STATUS message
  */
 static	int
-ngar_rcvmsg(node_p node, struct ng_mesg *msg,
-		const char *retaddr, struct ng_mesg **resp, hook_p lasthook)
+ngar_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
+				struct ng_mesg **rptr, hook_p lasthook)
 {
 	struct ar_softc *	sc;
+	struct ng_mesg *resp = NULL;
 	int error = 0;
 
 	sc = node->private;
 	switch (msg->header.typecookie) {
-	    case	NG_AR_COOKIE: 
+	case	NG_AR_COOKIE: 
 		error = EINVAL;
 		break;
-	    case	NGM_GENERIC_COOKIE: 
+	case	NGM_GENERIC_COOKIE: 
 		switch(msg->header.cmd) {
-		    case NGM_TEXT_STATUS: {
-			    char	*arg;
-			    int pos = 0;
-			    int resplen = sizeof(struct ng_mesg) + 512;
-			    MALLOC(*resp, struct ng_mesg *, resplen,
-					M_NETGRAPH, M_NOWAIT | M_ZERO);
-			    if (*resp == NULL) { 
+		case NGM_TEXT_STATUS: {
+			char        *arg;
+			int pos = 0;
+
+			int resplen = sizeof(struct ng_mesg) + 512;
+			NG_MKRESPONSE(resp, msg, resplen, M_NOWAIT);
+			if (resp == NULL) {
 				error = ENOMEM;
 				break;
-			    }       
-			    arg = (*resp)->data;
-
-			    /*
-			     * Put in the throughput information.
-			     */
-			    pos = sprintf(arg, "%ld bytes in, %ld bytes out\n"
+			}
+			arg = (resp)->data;
+			pos = sprintf(arg, "%ld bytes in, %ld bytes out\n"
 			    "highest rate seen: %ld B/S in, %ld B/S out\n",
-			    sc->inbytes, sc->outbytes,
-			    sc->inrate, sc->outrate);
-			    pos += sprintf(arg + pos,
+			sc->inbytes, sc->outbytes,
+			sc->inrate, sc->outrate);
+			pos += sprintf(arg + pos,
 				"%ld output errors\n",
 			    	sc->oerrors);
-			    pos += sprintf(arg + pos,
+			pos += sprintf(arg + pos,
 				"ierrors = %ld, %ld, %ld, %ld\n",
 			    	sc->ierrors[0],
 			    	sc->ierrors[1],
 			    	sc->ierrors[2],
 			    	sc->ierrors[3]);
 
-			    (*resp)->header.version = NG_VERSION;
-			    (*resp)->header.arglen = strlen(arg) + 1;
-			    (*resp)->header.token = msg->header.token;
-			    (*resp)->header.typecookie = NG_AR_COOKIE;
-			    (*resp)->header.cmd = msg->header.cmd;
-			    strncpy((*resp)->header.cmdstr, "status",
-					NG_CMDSTRLEN);
-			}
+			resp->header.arglen = pos + 1;
 			break;
-	    	    default:
+		      }
+		default:
 		 	error = EINVAL;
 		 	break;
 		    }
 		break;
-	    default:
+	default:
 		error = EINVAL;
 		break;
 	}
+	/* Take care of synchronous response, if any */
+	if (rptr)
+		*rptr = resp;
+	else if (resp)
+		/* Should send the hard way */
+		FREE(resp, M_NETGRAPH);
+
 	free(msg, M_NETGRAPH);
 	return (error);
 }