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npf_bpf_test.c revision 1.8 
      1 /*	$NetBSD: npf_bpf_test.c,v 1.8 2016/12/26 23:05:05 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mindaugas Rasiukevicius.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * NPF test of BPF coprocessor.
     34  */
     35 
     36 #ifdef _KERNEL
     37 #include <sys/types.h>
     38 #include <sys/endian.h>
     39 #endif
     40 
     41 #define	NPF_BPFCOP
     42 #include "npf_impl.h"
     43 #include "npf_test.h"
     44 
     45 static bool	lverbose = false;
     46 
     47 static struct mbuf *
     48 fill_packet(int proto)
     49 {
     50 	struct mbuf *m;
     51 	struct ip *ip;
     52 	struct tcphdr *th;
     53 
     54 	m = mbuf_construct(IPPROTO_TCP);
     55 	th = mbuf_return_hdrs(m, false, &ip);
     56 	ip->ip_src.s_addr = inet_addr("192.168.2.100");
     57 	ip->ip_dst.s_addr = inet_addr("10.0.0.1");
     58 	th->th_sport = htons(15000);
     59 	th->th_dport = htons(80);
     60 	return m;
     61 }
     62 
     63 static int
     64 test_bpf_code(void *code, size_t size)
     65 {
     66 	ifnet_t *dummy_ifp = npf_test_addif(IFNAME_TEST, false, false);
     67 	npf_cache_t npc = { .npc_info = 0, .npc_ctx = npf_getkernctx() };
     68 	uint32_t memstore[BPF_MEMWORDS];
     69 	bpf_args_t bc_args;
     70 	struct mbuf *m;
     71 	nbuf_t nbuf;
     72 	int ret, jret;
     73 	void *jcode;
     74 
     75 	/* Layer 3 (IP + TCP). */
     76 	m = fill_packet(IPPROTO_TCP);
     77 	nbuf_init(npf_getkernctx(), &nbuf, m, dummy_ifp);
     78 	npc.npc_nbuf = &nbuf;
     79 	npf_cache_all(&npc);
     80 #ifdef _NPF_STANDALONE
     81 	bc_args.pkt = (const uint8_t *)nbuf_dataptr(&nbuf);
     82 #else
     83 	bc_args.pkt = (const uint8_t *)m;
     84 #endif
     85 	bc_args.buflen = m_length(m);
     86 	bc_args.wirelen = bc_args.buflen;
     87 	bc_args.mem = memstore;
     88 	bc_args.arg = &npc;
     89 
     90 	ret = npf_bpf_filter(&bc_args, code, NULL);
     91 
     92 	/* JIT-compiled code. */
     93 	jcode = npf_bpf_compile(code, size);
     94 	if (jcode) {
     95 		jret = npf_bpf_filter(&bc_args, NULL, jcode);
     96 		assert(ret == jret);
     97 		bpf_jit_freecode(jcode);
     98 	} else if (lverbose) {
     99 		printf("JIT-compilation failed\n");
    100 	}
    101 	m_freem(m);
    102 
    103 	return ret;
    104 }
    105 
    106 static uint32_t
    107 npf_bpfcop_run(u_int reg)
    108 {
    109 	struct bpf_insn insns_npf_bpfcop[] = {
    110 		BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3),
    111 		BPF_STMT(BPF_LD+BPF_W+BPF_MEM, reg),
    112 		BPF_STMT(BPF_RET+BPF_A, 0),
    113 	};
    114 	return test_bpf_code(&insns_npf_bpfcop, sizeof(insns_npf_bpfcop));
    115 }
    116 
    117 static bool
    118 npf_bpfcop_test(void)
    119 {
    120 	bool fail = false;
    121 
    122 	/* A <- IP version (4 or 6) */
    123 	struct bpf_insn insns_ipver[] = {
    124 		BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3),
    125 		BPF_STMT(BPF_RET+BPF_A, 0),
    126 	};
    127 	fail |= (test_bpf_code(&insns_ipver, sizeof(insns_ipver)) != IPVERSION);
    128 
    129 	/* BPF_MW_IPVERI <- IP version */
    130 	fail |= (npf_bpfcop_run(BPF_MW_IPVER) != IPVERSION);
    131 
    132 	/* BPF_MW_L4OFF <- L4 header offset */
    133 	fail |= (npf_bpfcop_run(BPF_MW_L4OFF) != sizeof(struct ip));
    134 
    135 	/* BPF_MW_L4PROTO <- L4 protocol */
    136 	fail |= (npf_bpfcop_run(BPF_MW_L4PROTO) != IPPROTO_TCP);
    137 
    138 	return fail;
    139 }
    140 
    141 bool
    142 npf_bpf_test(bool verbose)
    143 {
    144 	bool fail = false;
    145 
    146 	lverbose = verbose;
    147 
    148 	fail |= npf_bpfcop_test();
    149 
    150 	return !fail;
    151 }
    152