2 * Copyright (C) 2002-2003 NetGroup, Politecnico di Torino (Italy)
3 * Copyright (C) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
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34 #ifndef _NET_BPF_JITTER_H_
35 #define _NET_BPF_JITTER_H_
38 MALLOC_DECLARE(M_BPFJIT);
41 extern int bpf_jitter_enable;
44 * Prototype of a filtering function created by the jitter.
46 * The syntax and the meaning of the parameters is analogous to the one of
47 * bpf_filter(). Notice that the filter is not among the parameters because
48 * it is hardwired in the function.
50 typedef u_int (*bpf_filter_func)(u_char *, u_int, u_int);
52 /* Structure describing a native filtering program created by the jitter. */
53 typedef struct bpf_jit_filter {
54 /* The native filtering binary, in the form of a bpf_filter_func. */
60 * BPF jitter, builds a machine function from a BPF program.
62 * param fp The BPF pseudo-assembly filter that will be translated
64 * param nins Number of instructions of the input filter.
65 * return The bpf_jit_filter structure containing the native filtering
68 * bpf_jitter allocates the buffers for the new native filter and
69 * then translates the program pointed by fp calling bpf_jit_compile().
71 bpf_jit_filter *bpf_jitter(struct bpf_insn *fp, int nins);
74 * Deletes a filtering function that was previously created by bpf_jitter().
76 * param filter The filter to destroy.
78 * This function frees the variuos buffers (code, memory, etc.) associated
79 * with a filtering function.
81 void bpf_destroy_jit_filter(bpf_jit_filter *filter);
83 #endif /* _NET_BPF_JITTER_H_ */