The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
    3  * Copyright (C) 2005-2008 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 #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 <string.h>
   46 #include <sys/types.h>
   47 #endif
   48 
   49 #include <net/bpf.h>
   50 #include <net/bpf_jitter.h>
   51 
   52 bpf_filter_func bpf_jit_compile(struct bpf_insn *, u_int, int *);
   53 
   54 static u_int    bpf_jit_accept_all(u_char *, u_int, u_int);
   55 
   56 #ifdef _KERNEL
   57 MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
   58 
   59 SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
   60 int bpf_jitter_enable = 1;
   61 SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
   62     &bpf_jitter_enable, 0, "enable BPF JIT compiler");
   63 
   64 bpf_jit_filter *
   65 bpf_jitter(struct bpf_insn *fp, int nins)
   66 {
   67         bpf_jit_filter *filter;
   68 
   69         /* Allocate the filter structure */
   70         filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
   71             M_BPFJIT, M_NOWAIT | M_ZERO);
   72         if (filter == NULL)
   73                 return (NULL);
   74 
   75         /* No filter means accept all */
   76         if (fp == NULL || nins == 0) {
   77                 filter->func = bpf_jit_accept_all;
   78                 return (filter);
   79         }
   80 
   81         /* Create the binary */
   82         if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
   83                 free(filter, M_BPFJIT);
   84                 return (NULL);
   85         }
   86 
   87         return (filter);
   88 }
   89 
   90 void
   91 bpf_destroy_jit_filter(bpf_jit_filter *filter)
   92 {
   93 
   94         if (filter->func != bpf_jit_accept_all)
   95                 free(filter->func, M_BPFJIT);
   96         free(filter, M_BPFJIT);
   97 }
   98 #else
   99 bpf_jit_filter *
  100 bpf_jitter(struct bpf_insn *fp, int nins)
  101 {
  102         bpf_jit_filter *filter;
  103 
  104         /* Allocate the filter structure */
  105         filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
  106         if (filter == NULL)
  107                 return (NULL);
  108         memset(filter, 0, sizeof(*filter));
  109 
  110         /* No filter means accept all */
  111         if (fp == NULL || nins == 0) {
  112                 filter->func = bpf_jit_accept_all;
  113                 return (filter);
  114         }
  115 
  116         /* Create the binary */
  117         if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
  118                 free(filter);
  119                 return (NULL);
  120         }
  121 
  122         return (filter);
  123 }
  124 
  125 void
  126 bpf_destroy_jit_filter(bpf_jit_filter *filter)
  127 {
  128 
  129         if (filter->func != bpf_jit_accept_all)
  130                 free(filter->func);
  131         free(filter);
  132 }
  133 #endif
  134 
  135 static u_int
  136 bpf_jit_accept_all(__unused u_char *p, __unused u_int wirelen,
  137     __unused u_int buflen)
  138 {
  139 
  140         return ((u_int)-1);
  141 }

Cache object: 4ce3f6cb2b5d30b2d64d252da6d77460


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.