diff options
author | jkim <jkim@FreeBSD.org> | 2005-12-06 02:58:12 +0000 |
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committer | jkim <jkim@FreeBSD.org> | 2005-12-06 02:58:12 +0000 |
commit | 055dc8e12114d91b9d472f6f1f094db4fc8470dc (patch) | |
tree | 71349d8c0b4cb1d3877c774dc90e493e18151057 /sys/net/bpf_jitter.c | |
parent | ce48506ba2c49b3a1814ff2cfa69af48afde0097 (diff) | |
download | FreeBSD-src-055dc8e12114d91b9d472f6f1f094db4fc8470dc.zip FreeBSD-src-055dc8e12114d91b9d472f6f1f094db4fc8470dc.tar.gz |
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)
Diffstat (limited to 'sys/net/bpf_jitter.c')
-rw-r--r-- | sys/net/bpf_jitter.c | 85 |
1 files changed, 85 insertions, 0 deletions
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); +} |