bpf_jitter.c revision 182173
1153151Sjkim/*- 2181846Sjkim * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy) 3181846Sjkim * Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org> 4153151Sjkim * All rights reserved. 5153151Sjkim * 6153151Sjkim * Redistribution and use in source and binary forms, with or without 7153151Sjkim * modification, are permitted provided that the following conditions 8153151Sjkim * are met: 9153151Sjkim * 10153151Sjkim * 1. Redistributions of source code must retain the above copyright 11153151Sjkim * notice, this list of conditions and the following disclaimer. 12153151Sjkim * 2. Redistributions in binary form must reproduce the above copyright 13153151Sjkim * notice, this list of conditions and the following disclaimer in the 14153151Sjkim * documentation and/or other materials provided with the distribution. 15153151Sjkim * 3. Neither the name of the Politecnico di Torino nor the names of its 16153151Sjkim * contributors may be used to endorse or promote products derived from 17153151Sjkim * this software without specific prior written permission. 18153151Sjkim * 19153151Sjkim * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20153151Sjkim * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21153151Sjkim * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22153151Sjkim * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23153151Sjkim * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24153151Sjkim * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25153151Sjkim * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26182173Sjkim * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27153151Sjkim * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28153151Sjkim * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29153151Sjkim * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30153151Sjkim */ 31153151Sjkim 32153151Sjkim#include <sys/cdefs.h> 33153151Sjkim__FBSDID("$FreeBSD: head/sys/net/bpf_jitter.c 182173 2008-08-25 20:43:13Z jkim $"); 34153151Sjkim 35181846Sjkim#ifdef _KERNEL 36153151Sjkim#include "opt_bpf.h" 37153151Sjkim 38153151Sjkim#include <sys/param.h> 39153151Sjkim#include <sys/kernel.h> 40153151Sjkim#include <sys/malloc.h> 41153151Sjkim#include <sys/mbuf.h> 42153213Sjkim#include <sys/sysctl.h> 43181846Sjkim#else 44181846Sjkim#include <stdlib.h> 45181846Sjkim#include <sys/types.h> 46181846Sjkim#endif 47153151Sjkim 48153151Sjkim#include <net/bpf.h> 49153151Sjkim#include <net/bpf_jitter.h> 50153151Sjkim 51181846Sjkimbpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, int *); 52181846Sjkim 53181846Sjkim#ifdef _KERNEL 54153151SjkimMALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler"); 55153151Sjkim 56153213SjkimSYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler"); 57153213Sjkimint bpf_jitter_enable = 1; 58153213SjkimSYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW, 59153213Sjkim &bpf_jitter_enable, 0, "enable BPF JIT compiler"); 60153213Sjkim 61153151Sjkimbpf_jit_filter * 62153151Sjkimbpf_jitter(struct bpf_insn *fp, int nins) 63153151Sjkim{ 64153151Sjkim bpf_jit_filter *filter; 65153151Sjkim 66153151Sjkim /* Allocate the filter structure */ 67181846Sjkim filter = (struct bpf_jit_filter *)malloc(sizeof(*filter), 68153157Sjkim M_BPFJIT, M_NOWAIT); 69153151Sjkim if (filter == NULL) 70181846Sjkim return (NULL); 71153151Sjkim 72153151Sjkim /* Create the binary */ 73153151Sjkim if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) { 74153151Sjkim free(filter, M_BPFJIT); 75181846Sjkim return (NULL); 76153151Sjkim } 77153151Sjkim 78181846Sjkim return (filter); 79153151Sjkim} 80153151Sjkim 81153151Sjkimvoid 82153151Sjkimbpf_destroy_jit_filter(bpf_jit_filter *filter) 83153151Sjkim{ 84153151Sjkim 85153151Sjkim free(filter->func, M_BPFJIT); 86153151Sjkim free(filter, M_BPFJIT); 87153151Sjkim} 88181846Sjkim#else 89181846Sjkimbpf_jit_filter * 90181846Sjkimbpf_jitter(struct bpf_insn *fp, int nins) 91181846Sjkim{ 92181846Sjkim bpf_jit_filter *filter; 93181846Sjkim 94181846Sjkim /* Allocate the filter structure */ 95181846Sjkim filter = (struct bpf_jit_filter *)malloc(sizeof(*filter)); 96181846Sjkim if (filter == NULL) 97181846Sjkim return (NULL); 98181846Sjkim 99181846Sjkim /* Create the binary */ 100181846Sjkim if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) { 101181846Sjkim free(filter); 102181846Sjkim return (NULL); 103181846Sjkim } 104181846Sjkim 105181846Sjkim return (filter); 106181846Sjkim} 107181846Sjkim 108181846Sjkimvoid 109181846Sjkimbpf_destroy_jit_filter(bpf_jit_filter *filter) 110181846Sjkim{ 111181846Sjkim 112181846Sjkim free(filter->func); 113181846Sjkim free(filter); 114181846Sjkim} 115181846Sjkim#endif 116