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h_bpf.h revision 1.1 
      1 /*	$NetBSD: h_bpf.h,v 1.1 2014/07/07 19:34:32 alnsn Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 Alexander Nasonov.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     17  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     19  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef _TESTS_NET_BPF_H_BPF_H_
     30 #define _TESTS_NET_BPF_H_BPF_H_
     31 
     32 #include <sys/param.h>
     33 #include <sys/mbuf.h>
     34 
     35 #include <net/bpf.h>
     36 #include <net/bpfjit.h>
     37 
     38 #include <rump/rump.h>
     39 #include <rump/rump_syscalls.h>
     40 
     41 #include <stdint.h>
     42 #include <string.h>
     43 
     44 /* XXX These declarations don't look kosher. */
     45 int rumpns_bpf_validate(const struct bpf_insn *, int);
     46 unsigned int rumpns_bpf_filter_ext(const bpf_ctx_t *,
     47     const struct bpf_insn *, bpf_args_t *);
     48 bpfjit_func_t rumpns_bpfjit_generate_code(const bpf_ctx_t *,
     49     const struct bpf_insn *, size_t);
     50 void rumpns_bpfjit_free_code(bpfjit_func_t);
     51 
     52 /*
     53  * Init mbuf chain with one or two chunks. The first chunk holds
     54  * [pkt, pkt + split] bytes, the second chunk (if it's not empty)
     55  * holds (pkt + split, pkt + pktsize) bytes.
     56  * The function returns (const uint8_t *)mb1.
     57  */
     58 static inline const uint8_t *
     59 init_mchain2(struct mbuf *mb1, struct mbuf *mb2,
     60     char pkt[], size_t pktsize, size_t split)
     61 {
     62 
     63 	(void)memset(mb1, 0, sizeof(*mb1));
     64 	mb1->m_data = pkt;
     65 	mb1->m_next = (split < pktsize) ? mb2 : NULL;
     66 	mb1->m_len = (split < pktsize) ? split : pktsize;
     67 
     68 	if (split < pktsize) {
     69 		(void)memset(mb2, 0, sizeof(*mb2));
     70 		mb2->m_next = NULL;
     71 		mb2->m_data = &pkt[split];
     72 		mb2->m_len = pktsize - split;
     73 	}
     74 
     75 	return (const uint8_t*)mb1;
     76 }
     77 
     78 /*
     79  * Interpret a filter program with mbuf chain passed to bpf_filter_ext().
     80  */
     81 static inline unsigned int
     82 interp_prog_mchain2(struct bpf_insn *insns,
     83     char *pkt, size_t pktsize, size_t split)
     84 {
     85 	uint32_t mem[BPF_MEMWORDS];
     86 	struct mbuf mb1, mb2;
     87 	bpf_args_t args;
     88 	unsigned int res;
     89 
     90 	args.pkt = init_mchain2(&mb1, &mb2, pkt, pktsize, split);
     91 	args.buflen = 0;
     92 	args.wirelen = pktsize;
     93 	args.mem = mem;
     94 
     95 	rump_schedule();
     96 	res = rumpns_bpf_filter_ext(NULL, insns, &args);
     97 	rump_unschedule();
     98 
     99 	return res;
    100 }
    101 
    102 /*
    103  * Compile and run a filter program with mbuf chain passed to compiled function.
    104  */
    105 static inline unsigned int
    106 exec_prog_mchain2(struct bpf_insn *insns, size_t insn_count,
    107     char *pkt, size_t pktsize, size_t split)
    108 {
    109 	bpfjit_func_t fn;
    110 	struct mbuf mb1, mb2;
    111 	bpf_args_t args;
    112 	unsigned int res;
    113 
    114 	args.pkt = init_mchain2(&mb1, &mb2, pkt, pktsize, split);
    115 	args.buflen = 0;
    116 	args.wirelen = pktsize;
    117 
    118 	rump_schedule();
    119 	fn = rumpns_bpfjit_generate_code(NULL, insns, insn_count);
    120 	rump_unschedule();
    121 
    122 	res = fn(NULL, &args);
    123 
    124 	rump_schedule();
    125 	rumpns_bpfjit_free_code(fn);
    126 	rump_unschedule();
    127 
    128 	return res;
    129 }
    130 
    131 static inline bool
    132 prog_validate(struct bpf_insn *insns, size_t insn_count)
    133 {
    134 	bool res;
    135 
    136 	rump_schedule();
    137 	res = rumpns_bpf_validate(insns, insn_count);
    138 	rump_unschedule();
    139 
    140 	return res;
    141 }
    142 
    143 #endif /* _TESTS_NET_BPF_H_BPF_H_ */
    144