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 static inline int
addr_eq(struct in_addr a,struct in_addr b)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 static inline int
rand_range(int min,int max)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), (di)); \
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