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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
- * Copyright (C) 2005-2017 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.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #ifdef _KERNEL
- #include "opt_bpf.h"
- #include <sys/param.h>
- #include <sys/kernel.h>
- #include <sys/malloc.h>
- #include <sys/mbuf.h>
- #include <sys/sysctl.h>
- #else
- #include <stdlib.h>
- #include <sys/mman.h>
- #include <sys/param.h>
- #include <sys/types.h>
- #endif
- #include <net/bpf.h>
- #include <net/bpf_jitter.h>
- static u_int bpf_jit_accept_all(u_char *, u_int, u_int);
- #ifdef _KERNEL
- MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
- SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
- "BPF JIT compiler");
- int bpf_jitter_enable = 1;
- SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
- &bpf_jitter_enable, 0, "enable BPF JIT compiler");
- #endif
- bpf_jit_filter *
- bpf_jitter(struct bpf_insn *fp, int nins)
- {
- bpf_jit_filter *filter;
- /* Allocate the filter structure. */
- #ifdef _KERNEL
- filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
- M_BPFJIT, M_NOWAIT);
- #else
- filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
- #endif
- if (filter == NULL)
- return (NULL);
- /* No filter means accept all. */
- if (fp == NULL || nins == 0) {
- filter->func = bpf_jit_accept_all;
- return (filter);
- }
- /* Create the binary. */
- if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) {
- #ifdef _KERNEL
- free(filter, M_BPFJIT);
- #else
- free(filter);
- #endif
- return (NULL);
- }
- return (filter);
- }
- void
- bpf_destroy_jit_filter(bpf_jit_filter *filter)
- {
- #ifdef _KERNEL
- if (filter->func != bpf_jit_accept_all)
- free(filter->func, M_BPFJIT);
- free(filter, M_BPFJIT);
- #else
- if (filter->func != bpf_jit_accept_all)
- munmap(filter->func, filter->size);
- free(filter);
- #endif
- }
- static u_int
- bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
- __unused u_int buflen)
- {
- return ((u_int)-1);
- }
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