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


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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 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 }

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