1 /* $NetBSD: npf_bpf_test.c,v 1.3 2013/11/16 01:41:43 rmind 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 #include <sys/types.h> 37 #include <sys/endian.h> 38 39 #define NPF_BPFCOP 40 #include "npf_impl.h" 41 #include "npf_test.h" 42 43 static bool lverbose = false; 44 45 static struct mbuf * 46 fill_packet(int proto) 47 { 48 struct mbuf *m; 49 struct ip *ip; 50 struct tcphdr *th; 51 52 m = mbuf_construct(IPPROTO_TCP); 53 th = mbuf_return_hdrs(m, false, &ip); 54 ip->ip_src.s_addr = inet_addr("192.168.2.100"); 55 ip->ip_dst.s_addr = inet_addr("10.0.0.1"); 56 th->th_sport = htons(15000); 57 th->th_dport = htons(80); 58 return m; 59 } 60 61 static int 62 test_bpf_code(void *code, size_t size) 63 { 64 ifnet_t *dummy_ifp = npf_test_addif(IFNAME_TEST, false, false); 65 npf_cache_t npc = { .npc_info = 0 }; 66 struct mbuf *m; 67 nbuf_t nbuf; 68 int ret, jret; 69 void *jcode; 70 71 /* Layer 3 (IP + TCP). */ 72 m = fill_packet(IPPROTO_TCP); 73 nbuf_init(&nbuf, m, dummy_ifp); 74 npf_cache_all(&npc, &nbuf); 75 76 ret = npf_bpf_filter(&npc, &nbuf, code, NULL); 77 78 /* JIT-compiled code. */ 79 jcode = npf_bpf_compile(code, size); 80 if (jcode) { 81 jret = npf_bpf_filter(&npc, &nbuf, NULL, jcode); 82 assert(ret == jret); 83 bpf_jit_freecode(jcode); 84 } else if (lverbose) { 85 printf("JIT-compilation failed\n"); 86 } 87 m_freem(m); 88 89 return ret; 90 } 91 92 static uint32_t 93 npf_bpfcop_run(u_int reg) 94 { 95 struct bpf_insn insns_npf_bpfcop[] = { 96 BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3), 97 BPF_STMT(BPF_LD+BPF_W+BPF_MEM, reg), 98 BPF_STMT(BPF_RET+BPF_A, 0), 99 }; 100 return test_bpf_code(&insns_npf_bpfcop, sizeof(insns_npf_bpfcop)); 101 } 102 103 static bool 104 npf_bpfcop_test(void) 105 { 106 bool fail = false; 107 108 /* A <- IP version (4 or 6) */ 109 struct bpf_insn insns_ipver[] = { 110 BPF_STMT(BPF_MISC+BPF_COP, NPF_COP_L3), 111 BPF_STMT(BPF_RET+BPF_A, 0), 112 }; 113 fail |= (test_bpf_code(&insns_ipver, sizeof(insns_ipver)) != IPVERSION); 114 115 /* BPF_MW_IPVERI <- IP version */ 116 fail |= (npf_bpfcop_run(BPF_MW_IPVER) != IPVERSION); 117 118 /* BPF_MW_L4OFF <- L4 header offset */ 119 fail |= (npf_bpfcop_run(BPF_MW_L4OFF) != sizeof(struct ip)); 120 121 /* BPF_MW_L4PROTO <- L4 protocol */ 122 fail |= (npf_bpfcop_run(BPF_MW_L4PROTO) != IPPROTO_TCP); 123 124 return fail; 125 } 126 127 bool 128 npf_bpf_test(bool verbose) 129 { 130 bool fail = false; 131 132 lverbose = verbose; 133 134 fail |= npf_bpfcop_test(); 135 136 return !fail; 137 } 138