2 * Copyright (c) 2002 - 2003 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (c) 2005 Jung-uk Kim <jkim@FreeBSD.org>
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34 #ifndef _NET_BPF_JITTER_H_
35 #define _NET_BPF_JITTER_H_
37 MALLOC_DECLARE(M_BPFJIT);
39 extern int bpf_jitter_enable;
42 * Prototype of a filtering function created by the jitter.
44 * The syntax and the meaning of the parameters is analogous to the one of
45 * bpf_filter(). Notice that the filter is not among the parameters because
46 * it is hardwired in the function.
48 typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
50 /* Structure describing a native filtering program created by the jitter. */
51 typedef struct bpf_jit_filter {
52 /* The native filtering binary, in the form of a bpf_filter_func. */
59 * BPF jitter, builds a machine function from a BPF program.
61 * param fp The BPF pseudo-assembly filter that will be translated
63 * param nins Number of instructions of the input filter.
64 * return The bpf_jit_filter structure containing the native filtering
67 * bpf_jitter allocates the buffers for the new native filter and
68 * then translates the program pointed by fp calling bpf_jit_compile().
70 bpf_jit_filter *bpf_jitter(struct bpf_insn *fp, int nins);
73 * Deletes a filtering function that was previously created by bpf_jitter().
75 * param filter The filter to destroy.
77 * This function frees the variuos buffers (code, memory, etc.) associated
78 * with a filtering function.
80 void bpf_destroy_jit_filter(bpf_jit_filter *filter);
82 #endif /* _NET_BPF_JITTER_H_ */