Initial import

Code is based on FreeBSD 8.2 with USB support from Sebastian Huber
and Thomas Doerfler. Initial TCP/IP stack work is from Kevel Kirspel.

1 files changed, 331 insertions, 0 deletions

diff --git a/rtems/freebsd/net/pfil.c b/rtems/freebsd/net/pfil.c
new file mode 100644
index 00000000..4a9a3f27
--- /dev/null
+++ b/rtems/freebsd/net/pfil.c
@@ -0,0 +1,331 @@
+#include <rtems/freebsd/machine/rtems-bsd-config.h>
+
+/*	$FreeBSD$ */
+/*	$NetBSD: pfil.c,v 1.20 2001/11/12 23:49:46 lukem Exp $	*/
+
+/*-
+ * Copyright (c) 1996 Matthew R. Green
+ * All rights reserved.
+ *
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <rtems/freebsd/sys/param.h>
+#include <rtems/freebsd/sys/kernel.h>
+#include <rtems/freebsd/sys/errno.h>
+#include <rtems/freebsd/sys/lock.h>
+#include <rtems/freebsd/sys/malloc.h>
+#include <rtems/freebsd/sys/rmlock.h>
+#include <rtems/freebsd/sys/socket.h>
+#include <rtems/freebsd/sys/socketvar.h>
+#include <rtems/freebsd/sys/systm.h>
+#include <rtems/freebsd/sys/condvar.h>
+#include <rtems/freebsd/sys/lock.h>
+#include <rtems/freebsd/sys/mutex.h>
+#include <rtems/freebsd/sys/proc.h>
+#include <rtems/freebsd/sys/queue.h>
+
+#include <rtems/freebsd/net/if.h>
+#include <rtems/freebsd/net/pfil.h>
+
+static struct mtx pfil_global_lock;
+
+MTX_SYSINIT(pfil_heads_lock, &pfil_global_lock, "pfil_head_list lock",
+  MTX_DEF);
+
+static int pfil_list_add(pfil_list_t *, struct packet_filter_hook *, int);
+
+static int pfil_list_remove(pfil_list_t *,
+    int (*)(void *, struct mbuf **, struct ifnet *, int, struct inpcb *),
+    void *);
+
+LIST_HEAD(pfilheadhead, pfil_head);
+VNET_DEFINE(struct pfilheadhead, pfil_head_list);
+#define	V_pfil_head_list	VNET(pfil_head_list)
+
+/*
+ * pfil_run_hooks() runs the specified packet filter hooks.
+ */
+int
+pfil_run_hooks(struct pfil_head *ph, struct mbuf **mp, struct ifnet *ifp,
+    int dir, struct inpcb *inp)
+{
+	struct rm_priotracker rmpt;
+	struct packet_filter_hook *pfh;
+	struct mbuf *m = *mp;
+	int rv = 0;
+
+	PFIL_RLOCK(ph, &rmpt);
+	KASSERT(ph->ph_nhooks >= 0, ("Pfil hook count dropped < 0"));
+	for (pfh = pfil_hook_get(dir, ph); pfh != NULL;
+	     pfh = TAILQ_NEXT(pfh, pfil_link)) {
+		if (pfh->pfil_func != NULL) {
+			rv = (*pfh->pfil_func)(pfh->pfil_arg, &m, ifp, dir,
+			    inp);
+			if (rv != 0 || m == NULL)
+				break;
+		}
+	}
+	PFIL_RUNLOCK(ph, &rmpt);
+	*mp = m;
+	return (rv);
+}
+
+/*
+ * pfil_head_register() registers a pfil_head with the packet filter hook
+ * mechanism.
+ */
+int
+pfil_head_register(struct pfil_head *ph)
+{
+	struct pfil_head *lph;
+
+	PFIL_LIST_LOCK();
+	LIST_FOREACH(lph, &V_pfil_head_list, ph_list) {
+		if (ph->ph_type == lph->ph_type &&
+		    ph->ph_un.phu_val == lph->ph_un.phu_val) {
+			PFIL_LIST_UNLOCK();
+			return (EEXIST);
+		}
+	}
+	PFIL_LOCK_INIT(ph);
+	ph->ph_nhooks = 0;
+	TAILQ_INIT(&ph->ph_in);
+	TAILQ_INIT(&ph->ph_out);
+	LIST_INSERT_HEAD(&V_pfil_head_list, ph, ph_list);
+	PFIL_LIST_UNLOCK();
+	return (0);
+}
+
+/*
+ * pfil_head_unregister() removes a pfil_head from the packet filter hook
+ * mechanism.  The producer of the hook promises that all outstanding
+ * invocations of the hook have completed before it unregisters the hook.
+ */
+int
+pfil_head_unregister(struct pfil_head *ph)
+{
+	struct packet_filter_hook *pfh, *pfnext;
+		
+	PFIL_LIST_LOCK();
+	LIST_REMOVE(ph, ph_list);
+	PFIL_LIST_UNLOCK();
+	TAILQ_FOREACH_SAFE(pfh, &ph->ph_in, pfil_link, pfnext)
+		free(pfh, M_IFADDR);
+	TAILQ_FOREACH_SAFE(pfh, &ph->ph_out, pfil_link, pfnext)
+		free(pfh, M_IFADDR);
+	PFIL_LOCK_DESTROY(ph);
+	return (0);
+}
+
+/*
+ * pfil_head_get() returns the pfil_head for a given key/dlt.
+ */
+struct pfil_head *
+pfil_head_get(int type, u_long val)
+{
+	struct pfil_head *ph;
+
+	PFIL_LIST_LOCK();
+	LIST_FOREACH(ph, &V_pfil_head_list, ph_list)
+		if (ph->ph_type == type && ph->ph_un.phu_val == val)
+			break;
+	PFIL_LIST_UNLOCK();
+	return (ph);
+}
+
+/*
+ * pfil_add_hook() adds a function to the packet filter hook.  the
+ * flags are:
+ *	PFIL_IN		call me on incoming packets
+ *	PFIL_OUT	call me on outgoing packets
+ *	PFIL_ALL	call me on all of the above
+ *	PFIL_WAITOK	OK to call malloc with M_WAITOK.
+ */
+int
+pfil_add_hook(int (*func)(void *, struct mbuf **, struct ifnet *, int,
+  struct inpcb *), void *arg, int flags, struct pfil_head *ph)
+{
+	struct packet_filter_hook *pfh1 = NULL;
+	struct packet_filter_hook *pfh2 = NULL;
+	int err;
+
+	if (flags & PFIL_IN) {
+		pfh1 = (struct packet_filter_hook *)malloc(sizeof(*pfh1), 
+		    M_IFADDR, (flags & PFIL_WAITOK) ? M_WAITOK : M_NOWAIT);
+		if (pfh1 == NULL) {
+			err = ENOMEM;
+			goto error;
+		}
+	}
+	if (flags & PFIL_OUT) {
+		pfh2 = (struct packet_filter_hook *)malloc(sizeof(*pfh1),
+		    M_IFADDR, (flags & PFIL_WAITOK) ? M_WAITOK : M_NOWAIT);
+		if (pfh2 == NULL) {
+			err = ENOMEM;
+			goto error;
+		}
+	}
+	PFIL_WLOCK(ph);
+	if (flags & PFIL_IN) {
+		pfh1->pfil_func = func;
+		pfh1->pfil_arg = arg;
+		err = pfil_list_add(&ph->ph_in, pfh1, flags & ~PFIL_OUT);
+		if (err)
+			goto locked_error;
+		ph->ph_nhooks++;
+	}
+	if (flags & PFIL_OUT) {
+		pfh2->pfil_func = func;
+		pfh2->pfil_arg = arg;
+		err = pfil_list_add(&ph->ph_out, pfh2, flags & ~PFIL_IN);
+		if (err) {
+			if (flags & PFIL_IN)
+				pfil_list_remove(&ph->ph_in, func, arg);
+			goto locked_error;
+		}
+		ph->ph_nhooks++;
+	}
+	PFIL_WUNLOCK(ph);
+	return (0);
+locked_error:
+	PFIL_WUNLOCK(ph);
+error:
+	if (pfh1 != NULL)
+		free(pfh1, M_IFADDR);
+	if (pfh2 != NULL)
+		free(pfh2, M_IFADDR);
+	return (err);
+}
+
+/*
+ * pfil_remove_hook removes a specific function from the packet filter hook
+ * list.
+ */
+int
+pfil_remove_hook(int (*func)(void *, struct mbuf **, struct ifnet *, int,
+    struct inpcb *), void *arg, int flags, struct pfil_head *ph)
+{
+	int err = 0;
+
+	PFIL_WLOCK(ph);
+	if (flags & PFIL_IN) {
+		err = pfil_list_remove(&ph->ph_in, func, arg);
+		if (err == 0)
+			ph->ph_nhooks--;
+	}
+	if ((err == 0) && (flags & PFIL_OUT)) {
+		err = pfil_list_remove(&ph->ph_out, func, arg);
+		if (err == 0)
+			ph->ph_nhooks--;
+	}
+	PFIL_WUNLOCK(ph);
+	return (err);
+}
+
+static int
+pfil_list_add(pfil_list_t *list, struct packet_filter_hook *pfh1, int flags)
+{
+	struct packet_filter_hook *pfh;
+
+	/*
+	 * First make sure the hook is not already there.
+	 */
+	TAILQ_FOREACH(pfh, list, pfil_link)
+		if (pfh->pfil_func == pfh1->pfil_func &&
+		    pfh->pfil_arg == pfh1->pfil_arg)
+			return (EEXIST);
+
+	/*
+	 * Insert the input list in reverse order of the output list so that
+	 * the same path is followed in or out of the kernel.
+	 */
+	if (flags & PFIL_IN)
+		TAILQ_INSERT_HEAD(list, pfh1, pfil_link);
+	else
+		TAILQ_INSERT_TAIL(list, pfh1, pfil_link);
+	return (0);
+}
+
+/*
+ * pfil_list_remove is an internal function that takes a function off the
+ * specified list.
+ */
+static int
+pfil_list_remove(pfil_list_t *list,
+    int (*func)(void *, struct mbuf **, struct ifnet *, int, struct inpcb *),
+    void *arg)
+{
+	struct packet_filter_hook *pfh;
+
+	TAILQ_FOREACH(pfh, list, pfil_link)
+		if (pfh->pfil_func == func && pfh->pfil_arg == arg) {
+			TAILQ_REMOVE(list, pfh, pfil_link);
+			free(pfh, M_IFADDR);
+			return (0);
+		}
+	return (ENOENT);
+}
+
+/****************
+ * Stuff that must be initialized for every instance
+ * (including the first of course).
+ */
+static int
+vnet_pfil_init(const void *unused)
+{
+	LIST_INIT(&V_pfil_head_list);
+	return (0);
+}
+
+/***********************
+ * Called for the removal of each instance.
+ */
+static int
+vnet_pfil_uninit(const void *unused)
+{
+	/*  XXX should panic if list is not empty */
+	return 0;
+}
+
+/* Define startup order. */
+#define	PFIL_SYSINIT_ORDER	SI_SUB_PROTO_BEGIN
+#define	PFIL_MODEVENT_ORDER	(SI_ORDER_FIRST) /* On boot slot in here. */
+#define	PFIL_VNET_ORDER		(PFIL_MODEVENT_ORDER + 2) /* Later still. */
+
+/*
+ * Starting up. 
+ * VNET_SYSINIT is called for each existing vnet and each new vnet.
+ */
+VNET_SYSINIT(vnet_pfil_init, PFIL_SYSINIT_ORDER, PFIL_VNET_ORDER,
+	    vnet_pfil_init, NULL);
+ 
+/*
+ * Closing up shop. These are done in REVERSE ORDER, 
+ * Not called on reboot.
+ * VNET_SYSUNINIT is called for each exiting vnet as it exits.
+ */
+VNET_SYSUNINIT(vnet_pfil_uninit, PFIL_SYSINIT_ORDER, PFIL_VNET_ORDER,
+	    vnet_pfil_uninit, NULL);
+