1 files changed, 150 insertions, 0 deletions
diff --git a/sys/kern/uipc_accf.c b/sys/kern/uipc_accf.c
new file mode 100644
index 0000000..b31026a
--- /dev/null
+++ b/sys/kern/uipc_accf.c
@@ -0,0 +1,150 @@
+/*
+ * Copyright (c) 2000 Paycounter, Inc.
+ * Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>
+ * 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.
+ *
+ * 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.
+ *
+ *	$FreeBSD$
+ */
+
+#define ACCEPT_FILTER_MOD
+
+#include "opt_param.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/domain.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/sysctl.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/queue.h>
+
+static SLIST_HEAD(, accept_filter) accept_filtlsthd =
+	SLIST_HEAD_INITIALIZER(&accept_filtlsthd);
+
+MALLOC_DEFINE(M_ACCF, "accf", "accept filter data");
+
+static int unloadable = 0;
+
+SYSCTL_DECL(_net_inet);	/* XXX: some header should do this for me */
+SYSCTL_NODE(_net_inet, OID_AUTO, accf, CTLFLAG_RW, 0, "Accept filters");
+SYSCTL_INT(_net_inet_accf, OID_AUTO, unloadable, CTLFLAG_RW, &unloadable, 0,
+	"Allow unload of accept filters (not recommended)");
+
+/*
+ * must be passed a malloc'd structure so we don't explode if the kld
+ * is unloaded, we leak the struct on deallocation to deal with this,
+ * but if a filter is loaded with the same name as a leaked one we re-use
+ * the entry.
+ */
+int
+accept_filt_add(struct accept_filter *filt)
+{
+	struct accept_filter *p;
+
+	SLIST_FOREACH(p, &accept_filtlsthd, accf_next)
+		if (strcmp(p->accf_name, filt->accf_name) == 0)  {
+			if (p->accf_callback != NULL) {
+				return (EEXIST);
+			} else {
+				p->accf_callback = filt->accf_callback;
+				FREE(filt, M_ACCF);
+				return (0);
+			}
+		}
+				
+	if (p == NULL)
+		SLIST_INSERT_HEAD(&accept_filtlsthd, filt, accf_next);
+	return (0);
+}
+
+int
+accept_filt_del(char *name)
+{
+	struct accept_filter *p;
+
+	p = accept_filt_get(name);
+	if (p == NULL)
+		return (ENOENT);
+
+	p->accf_callback = NULL;
+	return (0);
+}
+
+struct accept_filter *
+accept_filt_get(char *name)
+{
+	struct accept_filter *p;
+
+	SLIST_FOREACH(p, &accept_filtlsthd, accf_next)
+		if (strcmp(p->accf_name, name) == 0)
+			return (p);
+
+	return (NULL);
+}
+
+int
+accept_filt_generic_mod_event(module_t mod, int event, void *data)
+{
+	struct accept_filter *p;
+	struct accept_filter *accfp = (struct accept_filter *) data;
+	int	s, error;
+
+	switch (event) {
+	case MOD_LOAD:
+		MALLOC(p, struct accept_filter *, sizeof(*p), M_ACCF, M_WAITOK);
+		bcopy(accfp, p, sizeof(*p));
+		s = splnet();
+		error = accept_filt_add(p);
+		splx(s);
+		break;
+
+	case MOD_UNLOAD:
+		/*
+		 * Do not support unloading yet. we don't keep track of refcounts
+		 * and unloading an accept filter callback and then having it called
+		 * is a bad thing.  A simple fix would be to track the refcount
+		 * in the struct accept_filter.
+		 */
+		if (unloadable != 0) {
+			s = splnet();
+			error = accept_filt_del(accfp->accf_name);
+			splx(s);
+		} else
+			error = EOPNOTSUPP;
+		break;
+
+	case MOD_SHUTDOWN:
+		error = 0;
+		break;
+
+	default:
+		error = EOPNOTSUPP;
+		break;
+	}
+
+	return (error);
+}