1 /*- 2 * Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy) 3 * Copyright (c) 2005 Jung-uk Kim <jkim@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the Politecnico di Torino nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS intERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_bpf.h" 36 37 #include <sys/param.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/sysctl.h> 42 43 #include <net/bpf.h> 44 #include <net/bpf_jitter.h> 45 46 MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler"); 47 48 bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, int *); 49 50 SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler"); 51 int bpf_jitter_enable = 1; 52 SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW, 53 &bpf_jitter_enable, 0, "enable BPF JIT compiler"); 54 55 bpf_jit_filter * 56 bpf_jitter(struct bpf_insn *fp, int nins) 57 { 58 bpf_jit_filter *filter; 59 60 /* Allocate the filter structure */ 61 filter = (struct bpf_jit_filter *)malloc(sizeof(struct bpf_jit_filter), 62 M_BPFJIT, M_NOWAIT); 63 if (filter == NULL) 64 return NULL; 65 66 /* Allocate the filter's memory */ 67 filter->mem = (int *)malloc(BPF_MEMWORDS * sizeof(int), 68 M_BPFJIT, M_NOWAIT); 69 if (filter->mem == NULL) { 70 free(filter, M_BPFJIT); 71 return NULL; 72 } 73 74 /* Create the binary */ 75 if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) { 76 free(filter->mem, M_BPFJIT); 77 free(filter, M_BPFJIT); 78 return NULL; 79 } 80 81 return filter; 82 } 83 84 void 85 bpf_destroy_jit_filter(bpf_jit_filter *filter) 86 { 87 88 free(filter->mem, M_BPFJIT); 89 free(filter->func, M_BPFJIT); 90 free(filter, M_BPFJIT); 91 } 92