From 055dc8e12114d91b9d472f6f1f094db4fc8470dc Mon Sep 17 00:00:00 2001
From: jkim <jkim@FreeBSD.org>
Date: Tue, 6 Dec 2005 02:58:12 +0000
Subject: Add experimental BPF Just-In-Time compiler for amd64 and i386.

Use the following kernel configuration option to enable:

	options BPF_JITTER

If you want to use bpf_filter() instead (e. g., debugging), do:

	sysctl net.bpf.jitter.enable=0

to turn it off.

Currently BIOCSETWF and bpf_mtap2() are unsupported, and bpf_mtap() is
partially supported because 1) no need, 2) avoid expensive m_copydata(9).

Obtained from:	WinPcap 3.1 (for i386)
---
 sys/net/bpf_jitter.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 sys/net/bpf_jitter.c

(limited to 'sys/net/bpf_jitter.c')

diff --git a/sys/net/bpf_jitter.c b/sys/net/bpf_jitter.c
new file mode 100644
index 0000000..26a57fc
--- /dev/null
+++ b/sys/net/bpf_jitter.c
@@ -0,0 +1,85 @@
+/*-
+ * Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy)
+ * Copyright (c) 2005 Jung-uk Kim <jkim@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.
+ * 3. Neither the name of the Politecnico di Torino nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
+ * OWNER 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_bpf.h"
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+
+#include <net/bpf.h>
+#include <net/bpf_jitter.h>
+
+MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
+
+bpf_filter_func	bpf_jit_compile(struct bpf_insn *, u_int, int *);
+
+bpf_jit_filter *
+bpf_jitter(struct bpf_insn *fp, int nins)
+{
+	bpf_jit_filter *filter;
+
+	/* Allocate the filter structure */
+	filter = (struct bpf_jit_filter *)malloc(sizeof(struct bpf_jit_filter),
+	    M_BPFJIT, M_WAITOK);
+	if (filter == NULL)
+		return NULL;
+
+	/* Allocate the filter's memory */
+	filter->mem = (int *)malloc(BPF_MEMWORDS * sizeof(int),
+	    M_BPFJIT, M_WAITOK);
+	if (filter->mem == NULL) {
+		free(filter, M_BPFJIT);
+		return NULL;
+	}
+
+	/* Create the binary */
+	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
+		free(filter->mem, M_BPFJIT);
+		free(filter, M_BPFJIT);
+		return NULL;
+	}
+
+	return filter;
+}
+
+void
+bpf_destroy_jit_filter(bpf_jit_filter *filter)
+{
+
+	free(filter->mem, M_BPFJIT);
+	free(filter->func, M_BPFJIT);
+	free(filter, M_BPFJIT);
+}
-- 
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