1 /* 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright 2021 Lutz Donnerhacke 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 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 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials provided 15 * with the distribution. 16 * 3. Neither the name of the copyright holder nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 21 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 27 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 29 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 30 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 31 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/types.h> 35 36 #include <arpa/inet.h> 37 #include <netinet/ip.h> 38 #include <netinet/udp.h> 39 40 #ifndef _UTIL_H 41 #define _UTIL_H 42 43 /* common ip ranges */ 44 extern struct in_addr masq, pub, prv1, prv2, prv3, cgn, ext, ANY_ADDR; 45 46 int randcmp(const void *a, const void *b); 47 void hexdump(void *p, size_t len); 48 struct ip * ip_packet(u_char protocol, size_t len); 49 struct udphdr * set_udp(struct ip *p, u_short sport, u_short dport); 50 51 inline int 52 addr_eq(struct in_addr a, struct in_addr b) 53 { 54 return a.s_addr == b.s_addr; 55 } 56 57 #define a2h(a) ntohl(a.s_addr) 58 59 inline int 60 rand_range(int min, int max) 61 { 62 return min + rand()%(max - min); 63 } 64 65 #define NAT_CHECK(pip, src, dst, msq) do { \ 66 int res; \ 67 int len = ntohs(pip->ip_len); \ 68 pip->ip_src = src; \ 69 pip->ip_dst = dst; \ 70 res = LibAliasOut(la, pip, len); \ 71 ATF_CHECK_MSG(res == PKT_ALIAS_OK, \ 72 ">%d< not met PKT_ALIAS_OK", res); \ 73 ATF_CHECK(addr_eq(msq, pip->ip_src)); \ 74 ATF_CHECK(addr_eq(dst, pip->ip_dst)); \ 75 } while(0) 76 77 #define NAT_FAIL(pip, src, dst) do { \ 78 int res; \ 79 int len = ntohs(pip->ip_len); \ 80 pip->ip_src = src; \ 81 pip->ip_dst = dst; \ 82 res = LibAliasOut(la, pip, len); \ 83 ATF_CHECK_MSG(res != PKT_ALIAS_OK), \ 84 ">%d< not met !PKT_ALIAS_OK", res); \ 85 ATF_CHECK(addr_eq(src, pip->ip_src)); \ 86 ATF_CHECK(addr_eq(dst, pip->ip_dst)); \ 87 } while(0) 88 89 #define UNNAT_CHECK(pip, src, dst, rel) do { \ 90 int res; \ 91 int len = ntohs(pip->ip_len); \ 92 pip->ip_src = src; \ 93 pip->ip_dst = dst; \ 94 res = LibAliasIn(la, pip, len); \ 95 ATF_CHECK_MSG(res == PKT_ALIAS_OK, \ 96 ">%d< not met PKT_ALIAS_OK", res); \ 97 ATF_CHECK(addr_eq(src, pip->ip_src)); \ 98 ATF_CHECK(addr_eq(rel, pip->ip_dst)); \ 99 } while(0) 100 101 #define UNNAT_FAIL(pip, src, dst) do { \ 102 int res; \ 103 int len = ntohs(pip->ip_len); \ 104 pip->ip_src = src; \ 105 pip->ip_dst = dst; \ 106 res = LibAliasIn(la, pip, len); \ 107 ATF_CHECK_MSG(res != PKT_ALIAS_OK, \ 108 ">%d< not met !PKT_ALIAS_OK", res); \ 109 ATF_CHECK(addr_eq(src, pip->ip_src)); \ 110 ATF_CHECK(addr_eq(dst, pip->ip_dst)); \ 111 } while(0) 112 113 #define UDP_NAT_CHECK(p, u, si, sp, di, dp, mi) do { \ 114 u = set_udp(p, (sp), (dp)); \ 115 NAT_CHECK(p, (si), (di), (mi)); \ 116 ATF_CHECK(u->uh_dport == htons(dp)); \ 117 } while(0) 118 119 #define UDP_NAT_FAIL(p, u, si, sp, di, dp) do { \ 120 u = set_udp(p, (sp), (dp)); \ 121 NAT_FAIL(p, (si), (mi)); \ 122 } while(0) 123 124 #define UDP_UNNAT_CHECK(p, u, si, sp, mi, mp, di, dp) \ 125 do { \ 126 u = set_udp(p, (sp), (mp)); \ 127 UNNAT_CHECK(p, (si), (mi), (di)); \ 128 ATF_CHECK(u->uh_sport == htons(sp)); \ 129 ATF_CHECK(u->uh_dport == htons(dp)); \ 130 } while(0) 131 132 #define UDP_UNNAT_FAIL(p, u, si, sp, mi, mp) do { \ 133 u = set_udp(p, (sp), (mp)); \ 134 UNNAT_FAIL(p, (si), (mi)); \ 135 } while(0) 136 137 #endif /* _UTIL_H */ 138