Add rtems_bsd_set_if_input()

freebsd/sys/net/if.c

@@ -2698,6 +2698,22 @@ ifhwioctl(u_long cmd, struct ifnet *ifp, caddr_t data, struct thread *td)
 		break;
 	}
 
+#ifdef __rtems__
+	case RTEMS_SIOSIFINPUT:
+		if (ifp->if_input_arg == NULL) {
+			struct rtems_ifinputreq *ifipfr;
+
+			ifipfr = (struct rtems_ifinputreq *)data;
+			ifipfr->old_if_input = ifp->if_input;
+			ifp->if_input_arg = ifipfr->arg;
+			(*ifipfr->init)(ifp, ifipfr->arg);
+			ifp->if_input = ifipfr->new_if_input;
+			error = 0;
+		} else {
+			return (EEXIST);
+		}
+		break;
+#endif /* __rtems__ */
 	default:
 		error = ENOIOCTL;
 		break;

freebsd/sys/net/if_var.h

@@ -354,13 +354,27 @@ struct ifnet {
 	if_snd_tag_query_t *if_snd_tag_query;
 	if_snd_tag_free_t *if_snd_tag_free;
 
+#ifndef __rtems__
 	/*
 	 * Spare fields to be added before branching a stable branch, so
 	 * that structure can be enhanced without changing the kernel
 	 * binary interface.
 	 */
 	int	if_ispare[4];		/* general use */
+#else /* __rtems__ */
+	void	*if_input_arg;
+#endif /* __rtems__ */
 };
+#ifdef __rtems__
+struct rtems_ifinputreq {
+	char	ifr_name[IFNAMSIZ];
+	void 	*arg;
+	void	(*init)(struct ifnet *, void *);
+	void	(*new_if_input)(struct ifnet *, struct mbuf *);
+	void	(*old_if_input)(struct ifnet *, struct mbuf *);
+};
+#define	RTEMS_SIOSIFINPUT	_IOWR('i', 255, struct rtems_ifinputreq)
+#endif /* __rtems__ */
 
 /* for compatibility with other BSDs */
 #define	if_name(ifp)	((ifp)->if_xname)

libbsd.py

@@ -72,6 +72,7 @@ def rtems(mm):
             'rtems/rtems-bsd-rc-conf-net.c',
             'rtems/rtems-bsd-rc-conf-pf.c',
             'rtems/rtems-bsd-rc-conf.c',
+            'rtems/rtems-bsd-set-if-input.c',
             'rtems/rtems-bsd-shell-arp.c',
             'rtems/rtems-bsd-shell-ifconfig.c',
             'rtems/rtems-bsd-shell-netstat.c',

libbsd_waf.py

@@ -2197,6 +2197,7 @@ def build(bld):
               'rtemsbsd/rtems/rtems-bsd-rc-conf-pf.c',
               'rtemsbsd/rtems/rtems-bsd-rc-conf.c',
               'rtemsbsd/rtems/rtems-bsd-regdomain.c',
+              'rtemsbsd/rtems/rtems-bsd-set-if-input.c',
               'rtemsbsd/rtems/rtems-bsd-shell-arp.c',
               'rtemsbsd/rtems/rtems-bsd-shell-dhcpcd.c',
               'rtemsbsd/rtems/rtems-bsd-shell-ifconfig.c',

rtemsbsd/include/rtems/bsd/zerocopy.h

@@ -7,7 +7,7 @@
  */
 
 /*
- * Copyright (c) 2015 embedded brains GmbH.  All rights reserved.
+ * Copyright (c) 2015, 2017 embedded brains GmbH.  All rights reserved.
  *
  *  embedded brains GmbH
  *  Dornierstr. 4
@@ -61,6 +61,29 @@ void rtems_bsd_m_free(struct mbuf *m);
 int rtems_bsd_sendto(int socket, struct mbuf *m, int flags,
     const struct sockaddr *dest_addr);
 
+struct ifnet;
+
+typedef void (*rtems_bsd_if_input_init)(struct ifnet *, void *);
+
+typedef void (*rtems_bsd_if_input)(struct ifnet *, struct mbuf *);
+
+/**
+ * @brief Sets the interface input handler of the specified network interface.
+ *
+ * @param ifname The network interface name.
+ * @param init Initialization routine called right before the new interface
+ *   input handler is registered in the context of the executing thread.
+ * @param if_input The new interface input handler.
+ * @param arg The interface input handler argument available via struct
+ * ifnet::if_input_arg.
+ *
+ * @retval NULL An error occurred.
+ * @retval other The old interface input handler.
+ */
+rtems_bsd_if_input rtems_bsd_set_if_input(const char *ifname,
+    rtems_bsd_if_input_init init, rtems_bsd_if_input if_input,
+    void *arg);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */

rtemsbsd/rtems/rtems-bsd-set-if-input.c

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2017 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+
+#include <string.h>
+#include <unistd.h>
+
+#include <rtems/bsd/zerocopy.h>
+
+rtems_bsd_if_input
+rtems_bsd_set_if_input(const char *ifname,
+    rtems_bsd_if_input_init init, rtems_bsd_if_input if_input, void *arg)
+{
+	struct rtems_ifinputreq ifr;
+	int s;
+	int rv;
+
+	s = socket(AF_INET, SOCK_DGRAM, 0);
+	if (s < 0) {
+		return (NULL);
+	}
+
+	memset(&ifr, 0, sizeof(ifr));
+	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	ifr.arg = arg;
+	ifr.init = init;
+	ifr.new_if_input = if_input;
+
+	rv = ioctl(s, RTEMS_SIOSIFINPUT, (caddr_t)&ifr);
+	close(s);
+
+	if (rv != 0) {
+		return (NULL);
+	}
+
+	return (ifr.old_if_input);
+}