diff options
Diffstat (limited to 'sys/net/bpf_jitter.h')
-rw-r--r-- | sys/net/bpf_jitter.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/sys/net/bpf_jitter.h b/sys/net/bpf_jitter.h new file mode 100644 index 0000000..0ae64f9 --- /dev/null +++ b/sys/net/bpf_jitter.h @@ -0,0 +1,80 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#ifndef _NET_BPF_JITTER_H_ +#define _NET_BPF_JITTER_H_ + +MALLOC_DECLARE(M_BPFJIT); + +/* + * Prototype of a filtering function created by the jitter. + * + * The syntax and the meaning of the parameters is analogous to the one of + * bpf_filter(). Notice that the filter is not among the parameters because + * it is hardwired in the function. + */ +typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int); + +/* Structure describing a native filtering program created by the jitter. */ +typedef struct bpf_jit_filter { + /* The native filtering binary, in the form of a bpf_filter_func. */ + bpf_filter_func func; + + int *mem; +} bpf_jit_filter; + +/* + * BPF jitter, builds a machine function from a BPF program. + * + * param fp The BPF pseudo-assembly filter that will be translated + * into native code. + * param nins Number of instructions of the input filter. + * return The bpf_jit_filter structure containing the native filtering + * binary. + * + * bpf_jitter allocates the buffers for the new native filter and + * then translates the program pointed by fp calling bpf_jit_compile(). + */ +bpf_jit_filter *bpf_jitter(struct bpf_insn *fp, int nins); + +/* + * Deletes a filtering function that was previously created by bpf_jitter(). + * + * param filter The filter to destroy. + * + * This function frees the variuos buffers (code, memory, etc.) associated + * with a filtering function. + */ +void bpf_destroy_jit_filter(bpf_jit_filter *filter); + +#endif /* _NET_BPF_JITTER_H_ */ |