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FreeBSD/Linux Kernel Cross Reference
sys/net/bpf_jitter.c

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    1 /*-
    2  * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
    3  * Copyright (C) 2005-2009 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: head/sys/net/bpf_jitter.c 199615 2009-11-20 21:12:40Z jkim $");
   34 
   35 #ifdef _KERNEL
   36 #include "opt_bpf.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/kernel.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/sysctl.h>
   43 #else
   44 #include <stdlib.h>
   45 #include <sys/mman.h>
   46 #include <sys/param.h>
   47 #include <sys/types.h>
   48 #endif
   49 
   50 #include <net/bpf.h>
   51 #include <net/bpf_jitter.h>
   52 
   53 bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, size_t *);
   54 
   55 static u_int    bpf_jit_accept_all(u_char *, u_int, u_int);
   56 
   57 #ifdef _KERNEL
   58 MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
   59 
   60 SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
   61 int bpf_jitter_enable = 1;
   62 SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
   63     &bpf_jitter_enable, 0, "enable BPF JIT compiler");
   64 #endif
   65 
   66 bpf_jit_filter *
   67 bpf_jitter(struct bpf_insn *fp, int nins)
   68 {
   69         bpf_jit_filter *filter;
   70 
   71         /* Allocate the filter structure. */
   72 #ifdef _KERNEL
   73         filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
   74             M_BPFJIT, M_NOWAIT);
   75 #else
   76         filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
   77 #endif
   78         if (filter == NULL)
   79                 return (NULL);
   80 
   81         /* No filter means accept all. */
   82         if (fp == NULL || nins == 0) {
   83                 filter->func = bpf_jit_accept_all;
   84                 return (filter);
   85         }
   86 
   87         /* Create the binary. */
   88         if ((filter->func = bpf_jit_compile(fp, nins, &filter->size)) == NULL) {
   89 #ifdef _KERNEL
   90                 free(filter, M_BPFJIT);
   91 #else
   92                 free(filter);
   93 #endif
   94                 return (NULL);
   95         }
   96 
   97         return (filter);
   98 }
   99 
  100 void
  101 bpf_destroy_jit_filter(bpf_jit_filter *filter)
  102 {
  103 
  104 #ifdef _KERNEL
  105         if (filter->func != bpf_jit_accept_all)
  106                 free(filter->func, M_BPFJIT);
  107         free(filter, M_BPFJIT);
  108 #else
  109         if (filter->func != bpf_jit_accept_all)
  110                 munmap(filter->func, filter->size);
  111         free(filter);
  112 #endif
  113 }
  114 
  115 static u_int
  116 bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
  117     __unused u_int buflen)
  118 {
  119 
  120         return ((u_int)-1);
  121 }

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