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 <atf-c.h>
35#include <alias.h>
36#include <stdio.h>
37#include <stdlib.h>
38
39#include "util.h"
40
41ATF_TC_WITHOUT_HEAD(1_simplemasq);
42ATF_TC_BODY(1_simplemasq, dummy)
43{
44	struct libalias *la = LibAliasInit(NULL);
45	struct ip *pip;
46
47	ATF_REQUIRE(la != NULL);
48	LibAliasSetAddress(la, masq);
49	LibAliasSetMode(la, 0, ~0);
50
51	pip = ip_packet(254, 64);
52	NAT_CHECK(pip, prv1, ext, masq);
53	NAT_CHECK(pip, prv2, ext, masq);
54	NAT_CHECK(pip, prv3, ext, masq);
55	NAT_CHECK(pip, cgn,  ext, masq);
56	NAT_CHECK(pip, pub,  ext, masq);
57
58	free(pip);
59	LibAliasUninit(la);
60}
61
62ATF_TC_WITHOUT_HEAD(2_unregistered);
63ATF_TC_BODY(2_unregistered, dummy)
64{
65	struct libalias *la = LibAliasInit(NULL);
66	struct ip *pip;
67
68	ATF_REQUIRE(la != NULL);
69	LibAliasSetAddress(la, masq);
70	LibAliasSetMode(la, PKT_ALIAS_UNREGISTERED_ONLY, ~0);
71
72	pip = ip_packet(254, 64);
73	NAT_CHECK(pip, prv1, ext, masq);
74	NAT_CHECK(pip, prv2, ext, masq);
75	NAT_CHECK(pip, prv3, ext, masq);
76	NAT_CHECK(pip, cgn,  ext, cgn);
77	NAT_CHECK(pip, pub,  ext, pub);
78
79	/*
80	 * State is only for new connections
81	 * Because they are now active,
82	 * the mode setting should be ignored
83	 */
84	LibAliasSetMode(la, 0, PKT_ALIAS_UNREGISTERED_ONLY);
85	NAT_CHECK(pip, prv1, ext, masq);
86	NAT_CHECK(pip, prv2, ext, masq);
87	NAT_CHECK(pip, prv3, ext, masq);
88	NAT_CHECK(pip, cgn,  ext, cgn);
89	NAT_CHECK(pip, pub,  ext, pub);
90
91	free(pip);
92	LibAliasUninit(la);
93}
94
95ATF_TC_WITHOUT_HEAD(3_cgn);
96ATF_TC_BODY(3_cgn, dummy)
97{
98	struct libalias *la = LibAliasInit(NULL);
99	struct ip *pip;
100
101	ATF_REQUIRE(la != NULL);
102	LibAliasSetAddress(la, masq);
103	LibAliasSetMode(la, PKT_ALIAS_UNREGISTERED_CGN, ~0);
104
105	pip = ip_packet(254, 64);
106	NAT_CHECK(pip, prv1, ext, masq);
107	NAT_CHECK(pip, prv2, ext, masq);
108	NAT_CHECK(pip, prv3, ext, masq);
109	NAT_CHECK(pip, cgn,  ext, masq);
110	NAT_CHECK(pip, pub,  ext, pub);
111
112	/*
113	 * State is only for new connections
114	 * Because they are now active,
115	 * the mode setting should be ignored
116	 */
117	LibAliasSetMode(la, 0, PKT_ALIAS_UNREGISTERED_CGN);
118	NAT_CHECK(pip, prv1, ext, masq);
119	NAT_CHECK(pip, prv2, ext, masq);
120	NAT_CHECK(pip, prv3, ext, masq);
121	NAT_CHECK(pip, cgn,  ext, masq);
122	NAT_CHECK(pip, pub,  ext, pub);
123
124	free(pip);
125	LibAliasUninit(la);
126}
127
128ATF_TC_WITHOUT_HEAD(4_udp);
129ATF_TC_BODY(4_udp, dummy)
130{
131	struct libalias *la = LibAliasInit(NULL);
132	struct ip  *po, *pi;
133	struct udphdr *ui, *uo;
134	uint16_t sport = 0x1234;
135	uint16_t dport = 0x5678;
136	uint16_t aport;
137
138	ATF_REQUIRE(la != NULL);
139	LibAliasSetAddress(la, masq);
140	LibAliasSetMode(la, 0, ~0);
141
142	/* Query from prv1 */
143	po = ip_packet(0, 64);
144	UDP_NAT_CHECK(po, uo, prv1, sport, ext, dport, masq);
145	aport = ntohs(uo->uh_sport);
146	/* should use a different external port */
147	ATF_CHECK(aport != sport);
148
149	/* Response */
150	pi = ip_packet(0, 64);
151	UDP_UNNAT_CHECK(pi, ui, ext, dport, masq, aport, prv1, sport);
152
153	/* Query from different source with same ports */
154	UDP_NAT_CHECK(po, uo, prv2, sport, ext, dport, masq);
155	/* should use a different external port */
156	ATF_CHECK(uo->uh_sport != htons(aport));
157
158	/* Response to prv2 */
159	ui->uh_dport = uo->uh_sport;
160	UDP_UNNAT_CHECK(pi, ui, ext, dport, masq, htons(uo->uh_sport), prv2, sport);
161
162	/* Response to prv1 again */
163	UDP_UNNAT_CHECK(pi, ui, ext, dport, masq, aport, prv1, sport);
164
165	free(pi);
166	free(po);
167	LibAliasUninit(la);
168}
169
170ATF_TC_WITHOUT_HEAD(5_sameport);
171ATF_TC_BODY(5_sameport, dummy)
172{
173	struct libalias *la = LibAliasInit(NULL);
174	struct ip  *p;
175	struct udphdr *u;
176	uint16_t sport = 0x1234;
177	uint16_t dport = 0x5678;
178	uint16_t aport;
179
180	ATF_REQUIRE(la != NULL);
181	LibAliasSetAddress(la, masq);
182	LibAliasSetMode(la, PKT_ALIAS_SAME_PORTS, ~0);
183
184	/* Query from prv1 */
185	p = ip_packet(0, 64);
186	UDP_NAT_CHECK(p, u, prv1, sport, ext, dport, masq);
187	aport = ntohs(u->uh_sport);
188	/* should use the same external port */
189	ATF_CHECK(aport == sport);
190
191	/* Query from different source with same ports */
192	UDP_NAT_CHECK(p, u, prv2, sport, ext, dport, masq);
193	/* should use a different external port */
194	ATF_CHECK(u->uh_sport != htons(aport));
195
196	free(p);
197	LibAliasUninit(la);
198}
199
200ATF_TC_WITHOUT_HEAD(6_cleartable);
201ATF_TC_BODY(6_cleartable, dummy)
202{
203	struct libalias *la = LibAliasInit(NULL);
204	struct ip  *po, *pi;
205	struct udphdr *ui, *uo;
206	uint16_t sport = 0x1234;
207	uint16_t dport = 0x5678;
208	uint16_t aport;
209
210	ATF_REQUIRE(la != NULL);
211	LibAliasSetAddress(la, masq);
212	LibAliasSetMode(la, PKT_ALIAS_RESET_ON_ADDR_CHANGE, ~0);
213	LibAliasSetMode(la, PKT_ALIAS_SAME_PORTS, PKT_ALIAS_SAME_PORTS);
214	LibAliasSetMode(la, PKT_ALIAS_DENY_INCOMING, PKT_ALIAS_DENY_INCOMING);
215
216	/* Query from prv1 */
217	po = ip_packet(0, 64);
218	UDP_NAT_CHECK(po, uo, prv1, sport, ext, dport, masq);
219	aport = ntohs(uo->uh_sport);
220	/* should use the same external port */
221	ATF_CHECK(aport == sport);
222
223	/* Response */
224	pi = ip_packet(0, 64);
225	UDP_UNNAT_CHECK(po, uo, ext, dport, masq, aport, prv1, sport);
226
227	/* clear table by keeping the address */
228	LibAliasSetAddress(la, ext);
229	LibAliasSetAddress(la, masq);
230
231	/* Response to prv1 again -> DENY_INCOMING */
232	UDP_UNNAT_FAIL(pi, ui, ext, dport, masq, aport);
233
234	/* Query from different source with same ports */
235	UDP_NAT_CHECK(po, uo, prv2, sport, ext, dport, masq);
236	/* should use the same external port, because it's free */
237	ATF_CHECK(uo->uh_sport == htons(aport));
238
239	/* Response to prv2 */
240	UDP_UNNAT_CHECK(po, uo, ext, dport, masq, htons(uo->uh_sport), prv2, sport);
241
242	free(pi);
243	free(po);
244	LibAliasUninit(la);
245}
246
247ATF_TC_WITHOUT_HEAD(7_stress);
248ATF_TC_BODY(7_stress, dummy)
249{
250	struct libalias *la = LibAliasInit(NULL);
251	struct ip *p;
252	struct udphdr *u;
253	struct {
254		struct in_addr src, dst;
255		uint16_t sport, dport, aport;
256	} *batch;
257	size_t const batch_size = 1200;
258	size_t const rounds = 25;
259	size_t i, j;
260
261	ATF_REQUIRE(la != NULL);
262	LibAliasSetAddress(la, masq);
263
264	p = ip_packet(0, 64);
265
266	batch = calloc(batch_size, sizeof(*batch));
267	ATF_REQUIRE(batch != NULL);
268	for (j = 0; j < rounds; j++) {
269		for (i = 0; i < batch_size; i++) {
270			struct in_addr s, d;
271			switch (i&3) {
272			case 0: s = prv1; d = ext; break;
273			case 1: s = prv2; d = pub; break;
274			case 2: s = prv3; d = ext; break;
275			case 3: s = cgn;  d = pub; break;
276			}
277			s.s_addr &= htonl(0xffff0000);
278			d.s_addr &= htonl(0xffff0000);
279			batch[i].src.s_addr = s.s_addr | htonl(rand_range(0, 0xffff));
280			batch[i].dst.s_addr = d.s_addr | htonl(rand_range(0, 0xffff));
281			batch[i].sport = rand_range(1000, 60000);
282			batch[i].dport = rand_range(1000, 60000);
283		}
284
285		for (i = 0; i < batch_size; i++) {
286			UDP_NAT_CHECK(p, u,
287			    batch[i].src, batch[i].sport,
288			    batch[i].dst, batch[i].dport,
289			    masq);
290			batch[i].aport = htons(u->uh_sport);
291		}
292
293		qsort(batch, batch_size, sizeof(*batch), randcmp);
294
295		for (i = 0; i < batch_size; i++) {
296			UDP_UNNAT_CHECK(p, u,
297			    batch[i].dst,  batch[i].dport,
298			    masq, batch[i].aport,
299			    batch[i].src, batch[i].sport);
300		}
301	}
302
303	free(batch);
304	free(p);
305	LibAliasUninit(la);
306}
307
308ATF_TP_ADD_TCS(natout)
309{
310	/* Use "dd if=/dev/random bs=2 count=1 | od -x" to reproduce */
311	srand(0x0b61);
312
313	ATF_TP_ADD_TC(natout, 1_simplemasq);
314	ATF_TP_ADD_TC(natout, 2_unregistered);
315	ATF_TP_ADD_TC(natout, 3_cgn);
316	ATF_TP_ADD_TC(natout, 4_udp);
317	ATF_TP_ADD_TC(natout, 5_sameport);
318	ATF_TP_ADD_TC(natout, 6_cleartable);
319	ATF_TP_ADD_TC(natout, 7_stress);
320
321	return atf_no_error();
322}
323