bpf_jitter.c revision 153151
1276789Sdim/*- 2276789Sdim * Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy) 3353358Sdim * Copyright (c) 2005 Jung-uk Kim <jkim@FreeBSD.org> 4353358Sdim * All rights reserved. 5353358Sdim * 6276789Sdim * Redistribution and use in source and binary forms, with or without 7276789Sdim * modification, are permitted provided that the following conditions 8276789Sdim * are met: 9276789Sdim * 10276789Sdim * 1. Redistributions of source code must retain the above copyright 11276789Sdim * notice, this list of conditions and the following disclaimer. 12276789Sdim * 2. Redistributions in binary form must reproduce the above copyright 13276789Sdim * notice, this list of conditions and the following disclaimer in the 14276789Sdim * documentation and/or other materials provided with the distribution. 15276789Sdim * 3. Neither the name of the Politecnico di Torino nor the names of its 16276789Sdim * contributors may be used to endorse or promote products derived from 17276789Sdim * this software without specific prior written permission. 18276789Sdim * 19276789Sdim * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20276789Sdim * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21276789Sdim * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22276789Sdim * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23276789Sdim * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24276789Sdim * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25276789Sdim * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26276789Sdim * DATA, OR PROFITS; OR BUSINESS intERRUPTION) HOWEVER CAUSED AND ON ANY 27276789Sdim * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28276789Sdim * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29276789Sdim * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30276789Sdim */ 31276789Sdim 32276789Sdim#include <sys/cdefs.h> 33276789Sdim__FBSDID("$FreeBSD: head/sys/net/bpf_jitter.c 153151 2005-12-06 02:58:12Z jkim $"); 34276789Sdim 35276789Sdim#include "opt_bpf.h" 36276789Sdim 37288943Sdim#include <sys/param.h> 38276789Sdim#include <sys/kernel.h> 39276789Sdim#include <sys/malloc.h> 40276789Sdim#include <sys/mbuf.h> 41276789Sdim 42276789Sdim#include <net/bpf.h> 43276789Sdim#include <net/bpf_jitter.h> 44276789Sdim 45276789SdimMALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler"); 46276789Sdim 47276789Sdimbpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, int *); 48276789Sdim 49276789Sdimbpf_jit_filter * 50276789Sdimbpf_jitter(struct bpf_insn *fp, int nins) 51276789Sdim{ 52276789Sdim bpf_jit_filter *filter; 53276789Sdim 54276789Sdim /* Allocate the filter structure */ 55276789Sdim filter = (struct bpf_jit_filter *)malloc(sizeof(struct bpf_jit_filter), 56276789Sdim M_BPFJIT, M_WAITOK); 57276789Sdim if (filter == NULL) 58276789Sdim return NULL; 59276789Sdim 60276789Sdim /* Allocate the filter's memory */ 61276789Sdim filter->mem = (int *)malloc(BPF_MEMWORDS * sizeof(int), 62276789Sdim M_BPFJIT, M_WAITOK); 63276789Sdim if (filter->mem == NULL) { 64276789Sdim free(filter, M_BPFJIT); 65276789Sdim return NULL; 66276789Sdim } 67 68 /* Create the binary */ 69 if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) { 70 free(filter->mem, M_BPFJIT); 71 free(filter, M_BPFJIT); 72 return NULL; 73 } 74 75 return filter; 76} 77 78void 79bpf_destroy_jit_filter(bpf_jit_filter *filter) 80{ 81 82 free(filter->mem, M_BPFJIT); 83 free(filter->func, M_BPFJIT); 84 free(filter, M_BPFJIT); 85} 86