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