xref: /freebsd/sys/net/bpf_jitter.c (revision f471e5690ea96d32b91a7b049487f0221d9662dc)
1ae275efcSJung-uk Kim /*-
23bfea868SJung-uk Kim  * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
33bfea868SJung-uk Kim  * Copyright (C) 2005-2008 Jung-uk Kim <jkim@FreeBSD.org>
4ae275efcSJung-uk Kim  * All rights reserved.
5ae275efcSJung-uk Kim  *
6ae275efcSJung-uk Kim  * Redistribution and use in source and binary forms, with or without
7ae275efcSJung-uk Kim  * modification, are permitted provided that the following conditions
8ae275efcSJung-uk Kim  * are met:
9ae275efcSJung-uk Kim  *
10ae275efcSJung-uk Kim  * 1. Redistributions of source code must retain the above copyright
11ae275efcSJung-uk Kim  * notice, this list of conditions and the following disclaimer.
12ae275efcSJung-uk Kim  * 2. Redistributions in binary form must reproduce the above copyright
13ae275efcSJung-uk Kim  * notice, this list of conditions and the following disclaimer in the
14ae275efcSJung-uk Kim  * documentation and/or other materials provided with the distribution.
15ae275efcSJung-uk Kim  * 3. Neither the name of the Politecnico di Torino nor the names of its
16ae275efcSJung-uk Kim  * contributors may be used to endorse or promote products derived from
17ae275efcSJung-uk Kim  * this software without specific prior written permission.
18ae275efcSJung-uk Kim  *
19ae275efcSJung-uk Kim  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20ae275efcSJung-uk Kim  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21ae275efcSJung-uk Kim  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22ae275efcSJung-uk Kim  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23ae275efcSJung-uk Kim  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24ae275efcSJung-uk Kim  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25ae275efcSJung-uk Kim  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26f471e569SJung-uk Kim  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27ae275efcSJung-uk Kim  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28ae275efcSJung-uk Kim  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29ae275efcSJung-uk Kim  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30ae275efcSJung-uk Kim  */
31ae275efcSJung-uk Kim 
32ae275efcSJung-uk Kim #include <sys/cdefs.h>
33ae275efcSJung-uk Kim __FBSDID("$FreeBSD$");
34ae275efcSJung-uk Kim 
353bfea868SJung-uk Kim #ifdef _KERNEL
36ae275efcSJung-uk Kim #include "opt_bpf.h"
37ae275efcSJung-uk Kim 
38ae275efcSJung-uk Kim #include <sys/param.h>
39ae275efcSJung-uk Kim #include <sys/kernel.h>
40ae275efcSJung-uk Kim #include <sys/malloc.h>
41ae275efcSJung-uk Kim #include <sys/mbuf.h>
42848c454cSJung-uk Kim #include <sys/sysctl.h>
433bfea868SJung-uk Kim #else
443bfea868SJung-uk Kim #include <stdlib.h>
453bfea868SJung-uk Kim #include <sys/types.h>
463bfea868SJung-uk Kim #endif
47ae275efcSJung-uk Kim 
48ae275efcSJung-uk Kim #include <net/bpf.h>
49ae275efcSJung-uk Kim #include <net/bpf_jitter.h>
50ae275efcSJung-uk Kim 
51ae275efcSJung-uk Kim bpf_filter_func	bpf_jit_compile(struct bpf_insn *, u_int, int *);
52ae275efcSJung-uk Kim 
533bfea868SJung-uk Kim #ifdef _KERNEL
543bfea868SJung-uk Kim MALLOC_DEFINE(M_BPFJIT, "BPF_JIT", "BPF JIT compiler");
553bfea868SJung-uk Kim 
56848c454cSJung-uk Kim SYSCTL_NODE(_net, OID_AUTO, bpf_jitter, CTLFLAG_RW, 0, "BPF JIT compiler");
57848c454cSJung-uk Kim int bpf_jitter_enable = 1;
58848c454cSJung-uk Kim SYSCTL_INT(_net_bpf_jitter, OID_AUTO, enable, CTLFLAG_RW,
59848c454cSJung-uk Kim     &bpf_jitter_enable, 0, "enable BPF JIT compiler");
60848c454cSJung-uk Kim 
61ae275efcSJung-uk Kim bpf_jit_filter *
62ae275efcSJung-uk Kim bpf_jitter(struct bpf_insn *fp, int nins)
63ae275efcSJung-uk Kim {
64ae275efcSJung-uk Kim 	bpf_jit_filter *filter;
65ae275efcSJung-uk Kim 
66ae275efcSJung-uk Kim 	/* Allocate the filter structure */
673bfea868SJung-uk Kim 	filter = (struct bpf_jit_filter *)malloc(sizeof(*filter),
686a96c483SJung-uk Kim 	    M_BPFJIT, M_NOWAIT);
69ae275efcSJung-uk Kim 	if (filter == NULL)
703bfea868SJung-uk Kim 		return (NULL);
71ae275efcSJung-uk Kim 
72ae275efcSJung-uk Kim 	/* Create the binary */
73ae275efcSJung-uk Kim 	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
74ae275efcSJung-uk Kim 		free(filter, M_BPFJIT);
753bfea868SJung-uk Kim 		return (NULL);
76ae275efcSJung-uk Kim 	}
77ae275efcSJung-uk Kim 
783bfea868SJung-uk Kim 	return (filter);
79ae275efcSJung-uk Kim }
80ae275efcSJung-uk Kim 
81ae275efcSJung-uk Kim void
82ae275efcSJung-uk Kim bpf_destroy_jit_filter(bpf_jit_filter *filter)
83ae275efcSJung-uk Kim {
84ae275efcSJung-uk Kim 
85ae275efcSJung-uk Kim 	free(filter->func, M_BPFJIT);
86ae275efcSJung-uk Kim 	free(filter, M_BPFJIT);
87ae275efcSJung-uk Kim }
883bfea868SJung-uk Kim #else
893bfea868SJung-uk Kim bpf_jit_filter *
903bfea868SJung-uk Kim bpf_jitter(struct bpf_insn *fp, int nins)
913bfea868SJung-uk Kim {
923bfea868SJung-uk Kim 	bpf_jit_filter *filter;
933bfea868SJung-uk Kim 
943bfea868SJung-uk Kim 	/* Allocate the filter structure */
953bfea868SJung-uk Kim 	filter = (struct bpf_jit_filter *)malloc(sizeof(*filter));
963bfea868SJung-uk Kim 	if (filter == NULL)
973bfea868SJung-uk Kim 		return (NULL);
983bfea868SJung-uk Kim 
993bfea868SJung-uk Kim 	/* Create the binary */
1003bfea868SJung-uk Kim 	if ((filter->func = bpf_jit_compile(fp, nins, filter->mem)) == NULL) {
1013bfea868SJung-uk Kim 		free(filter);
1023bfea868SJung-uk Kim 		return (NULL);
1033bfea868SJung-uk Kim 	}
1043bfea868SJung-uk Kim 
1053bfea868SJung-uk Kim 	return (filter);
1063bfea868SJung-uk Kim }
1073bfea868SJung-uk Kim 
1083bfea868SJung-uk Kim void
1093bfea868SJung-uk Kim bpf_destroy_jit_filter(bpf_jit_filter *filter)
1103bfea868SJung-uk Kim {
1113bfea868SJung-uk Kim 
1123bfea868SJung-uk Kim 	free(filter->func);
1133bfea868SJung-uk Kim 	free(filter);
1143bfea868SJung-uk Kim }
1153bfea868SJung-uk Kim #endif
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