1153151Sjkim/*- 2181846Sjkim * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy) 3199492Sjkim * Copyright (C) 2005-2009 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: releng/10.2/sys/net/bpf_jitter.c 199615 2009-11-20 21:12:40Z 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> 45199492Sjkim#include <sys/mman.h> 46199492Sjkim#include <sys/param.h> 47181846Sjkim#include <sys/types.h> 48181846Sjkim#endif 49153151Sjkim 50153151Sjkim#include <net/bpf.h> 51153151Sjkim#include <net/bpf_jitter.h> 52153151Sjkim 53199603Sjkimbpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *); 54181846Sjkim 55182220Sjkimstatic u_int bpf_jit_accept_all(u_char *, u_int, u_int); 56182220Sjkim 57181846Sjkim#ifdef _KERNEL 58153151SjkimMALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler"); 59153151Sjkim 60153213SjkimSYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler"); 61153213Sjkimint bpf_jitter_enable = 1; 62153213SjkimSYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW, 63153213Sjkim &bpf_jitter_enable, 0, "enable BPF JIT compiler"); 64199615Sjkim#endif 65153213Sjkim 66153151Sjkimbpf_jit_filter * 67153151Sjkimbpf_jitter(struct bpf_insn *fp, int nins) 68153151Sjkim{ 69153151Sjkim bpf_jit_filter *filter; 70153151Sjkim 71199615Sjkim /* Allocate the filter structure. */ 72199615Sjkim#ifdef _KERNEL 73181846Sjkim filter = (struct bpf_jit_filter *)malloc(sizeof(*filter), 74199603Sjkim M_BPFJIT, M_NOWAIT); 75199615Sjkim#else 76199615Sjkim filter = (struct bpf_jit_filter *)malloc(sizeof(*filter)); 77199615Sjkim#endif 78153151Sjkim if (filter == NULL) 79181846Sjkim return (NULL); 80153151Sjkim 81199615Sjkim /* No filter means accept all. */ 82182220Sjkim if (fp == NULL || nins == 0) { 83182220Sjkim filter->func = bpf_jit_accept_all; 84182220Sjkim return (filter); 85182220Sjkim } 86182220Sjkim 87199615Sjkim /* Create the binary. */ 88199603Sjkim if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) { 89199615Sjkim#ifdef _KERNEL 90153151Sjkim free(filter, M_BPFJIT); 91199615Sjkim#else 92199615Sjkim free(filter); 93199615Sjkim#endif 94181846Sjkim return (NULL); 95153151Sjkim } 96153151Sjkim 97181846Sjkim return (filter); 98153151Sjkim} 99153151Sjkim 100153151Sjkimvoid 101153151Sjkimbpf_destroy_jit_filter(bpf_jit_filter *filter) 102153151Sjkim{ 103153151Sjkim 104199615Sjkim#ifdef _KERNEL 105182220Sjkim if (filter->func != bpf_jit_accept_all) 106199603Sjkim free(filter->func, M_BPFJIT); 107153151Sjkim free(filter, M_BPFJIT); 108181846Sjkim#else 109182220Sjkim if (filter->func != bpf_jit_accept_all) 110199498Sjkim munmap(filter->func, filter->size); 111181846Sjkim free(filter); 112199615Sjkim#endif 113181846Sjkim} 114182220Sjkim 115182220Sjkimstatic u_int 116182220Sjkimbpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen, 117182220Sjkim __unused u_int buflen) 118182220Sjkim{ 119182220Sjkim 120182220Sjkim return ((u_int)-1); 121182220Sjkim} 122