Have NgMkSockNode() load the socket node type KLD if it's not

already loaded (indicated by EPROTONOSUPPORT from socket(2)).

3 files changed, 24 insertions, 2 deletions

diff --git a/lib/libnetgraph/internal.h b/lib/libnetgraph/internal.h
index d521cfa5039d..99b5eccac427 100644
--- a/lib/libnetgraph/internal.h
+++ b/lib/libnetgraph/internal.h
@@ -41,9 +41,11 @@
  */
 
 #include <sys/types.h>
+#include <sys/param.h>
 #include <sys/time.h>
 #include <sys/socket.h>
 #include <sys/select.h>
+#include <sys/linker.h>
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/lib/libnetgraph/netgraph.3 b/lib/libnetgraph/netgraph.3
index 8f336583a14a..c30dc1bdb48e 100644
--- a/lib/libnetgraph/netgraph.3
+++ b/lib/libnetgraph/netgraph.3
@@ -95,6 +95,8 @@ associated with the node; either
 or
 .Fa "dsp"
 may be NULL if only one socket is desired.
+.Fn NgMkSockNode
+loads the socket node type KLD if it's not already loaded.
 .Pp
 .Fn NgNameNode
 assigns a global name to the node addressed by
@@ -273,10 +275,11 @@ ASCII control message array or fixed width string buffer overflow.
 .El
 .Sh SEE ALSO
 .Xr netgraph 4 ,
+.Xr kld 4 ,
 .Xr socket 2 ,
 .Xr select 2 ,
 .Xr warnx 3 ,
-.Xr ng_socket 8 .
+.Xr ng_socket 8
 .Sh HISTORY
 The
 .Nm netgraph
diff --git a/lib/libnetgraph/sock.c b/lib/libnetgraph/sock.c
index b8bb9e65a364..c5a82341162a 100644
--- a/lib/libnetgraph/sock.c
+++ b/lib/libnetgraph/sock.c
@@ -48,6 +48,9 @@
 #include "netgraph.h"
 #include "internal.h"
 
+/* The socket node type KLD */
+#define NG_SOCKET_KLD	"ng_socket.ko"
+
 /*
  * Create a socket type node and give it the supplied name.
  * Return data and control sockets corresponding to the node.
@@ -65,14 +68,28 @@ NgMkSockNode(const char *name, int *csp, int *dsp)
 	if (name && *name == 0)
 		name = NULL;
 
-	/* Create control socket; this also creates the netgraph node */
+	/* Create control socket; this also creates the netgraph node.
+	   If we get a EPROTONOSUPPORT then the socket node type is
+	   not loaded, so load it and try again. */
 	if ((cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL)) < 0) {
+		if (errno == EPROTONOSUPPORT) {
+			if (kldload(NG_SOCKET_KLD) < 0) {
+				errnosv = errno;
+				if (_gNgDebugLevel >= 1)
+					NGLOG("can't load %s", NG_SOCKET_KLD);
+				goto errout;
+			}
+			cs = socket(AF_NETGRAPH, SOCK_DGRAM, NG_CONTROL);
+			if (cs >= 0)
+				goto gotNode;
+		}
 		errnosv = errno;
 		if (_gNgDebugLevel >= 1)
 			NGLOG("socket");
 		goto errout;
 	}
 
+gotNode:
 	/* Assign the node the desired name, if any */
 	if (name != NULL) {
 		u_char sbuf[NG_NODELEN + 3];