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21effc03 | 1 | /* |
eadd1644 | 2 | * Copyright (c) 2009, 2010, 2011, 2014 Nicira, Inc. |
21effc03 | 3 | * |
a14bc59f BP |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
21effc03 | 7 | * |
a14bc59f BP |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
21effc03 BP |
15 | */ |
16 | ||
17 | #include <config.h> | |
3f636c7e | 18 | #undef NDEBUG |
21effc03 | 19 | #include "csum.h" |
3f636c7e | 20 | #include <assert.h> |
21effc03 BP |
21 | #include <inttypes.h> |
22 | #include <netinet/in.h> | |
0292a0c9 | 23 | #include <netinet/ip.h> |
21effc03 BP |
24 | #include <stdio.h> |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
3f636c7e JR |
27 | #include "crc32c.h" |
28 | #include "ovstest.h" | |
0292a0c9 | 29 | #include "packets.h" |
21effc03 | 30 | #include "random.h" |
80642190 | 31 | #include "unaligned.h" |
21effc03 | 32 | #include "util.h" |
21effc03 BP |
33 | |
34 | struct test_case { | |
35 | char *data; | |
d932cf70 | 36 | size_t size; /* Test requires a multiple of 4. */ |
21effc03 BP |
37 | uint16_t csum; |
38 | }; | |
39 | ||
40 | #define TEST_CASE(DATA, CSUM) { DATA, (sizeof DATA) - 1, CSUM } | |
41 | ||
42 | static const struct test_case test_cases[] = { | |
43 | /* RFC 1071 section 3. */ | |
d932cf70 BP |
44 | TEST_CASE("\x00\x01\xf2\x03" |
45 | "\xf4\xf5\xf6\xf7", | |
d84d4b88 | 46 | 0xffff - 0xddf2 /* ~0xddf2 */), |
21effc03 BP |
47 | |
48 | /* http://www.sbprojects.com/projects/tcpip/theory/theory14.htm */ | |
d932cf70 BP |
49 | TEST_CASE("\x45\x00\x00\x28" |
50 | "\x1F\xFD\x40\x00" | |
51 | "\x80\x06\x00\x00" | |
52 | "\xC0\xA8\x3B\x0A" | |
53 | "\xC0\xA8\x3B\x32", | |
21effc03 BP |
54 | 0xe345), |
55 | ||
56 | /* http://mathforum.org/library/drmath/view/54379.html */ | |
d932cf70 BP |
57 | TEST_CASE("\x86\x5e\xac\x60" |
58 | "\x71\x2a\x81\xb5", | |
59 | 0xda60), | |
21effc03 BP |
60 | }; |
61 | ||
62 | static void | |
63 | mark(char c) | |
64 | { | |
65 | putchar(c); | |
66 | fflush(stdout); | |
67 | } | |
68 | ||
69 | #if 0 | |
70 | /* This code is useful for generating new test cases for RFC 1624 section 4. */ | |
71 | static void | |
72 | generate_rfc1624_test_case(void) | |
73 | { | |
74 | int i; | |
75 | ||
76 | for (i = 0; i < 10000000; i++) { | |
77 | uint32_t data[8]; | |
78 | int j; | |
79 | ||
80 | for (j = 0; j < 8; j++) { | |
81 | data[j] = random_uint32(); | |
82 | } | |
83 | data[7] &= 0x0000ffff; | |
84 | data[7] |= 0x55550000; | |
85 | if (ntohs(~csum(data, sizeof data - 2)) == 0xcd7a) { | |
86 | ovs_hex_dump(stdout, data, sizeof data, 0, false); | |
87 | exit(0); | |
88 | } | |
89 | } | |
90 | } | |
91 | #endif | |
92 | ||
93 | ||
94 | ||
95 | /* Make sure we get the calculation in RFC 1624 section 4 correct. */ | |
96 | static void | |
97 | test_rfc1624(void) | |
98 | { | |
99 | /* "...an IP packet header in which a 16-bit field m = 0x5555..." */ | |
8d32c1d3 EJ |
100 | uint8_t data[32] = { |
101 | 0xfe, 0x8f, 0xc1, 0x14, 0x4b, 0x6f, 0x70, 0x2a, | |
102 | 0x80, 0x29, 0x78, 0xc0, 0x58, 0x81, 0x77, 0xaa, | |
103 | 0x66, 0x64, 0xfc, 0x96, 0x63, 0x97, 0x64, 0xee, | |
104 | 0x12, 0x53, 0x1d, 0xa9, 0x2d, 0xa9, 0x55, 0x55 | |
105 | }; | |
21effc03 BP |
106 | |
107 | /* "...the one's complement sum of all other header octets is 0xCD7A." */ | |
d84d4b88 | 108 | assert(ntohs(csum(data, sizeof data - 2)) == 0xffff - 0xcd7a); |
21effc03 BP |
109 | |
110 | /* "...the header checksum would be: | |
111 | ||
112 | HC = ~(0xCD7A + 0x5555) | |
113 | = ~0x22D0 | |
114 | = 0xDD2F" | |
115 | */ | |
116 | assert(ntohs(csum(data, sizeof data)) == 0xdd2f); | |
117 | ||
118 | /* "a 16-bit field m = 0x5555 changes to m' = 0x3285..." */ | |
119 | data[30] = 0x32; | |
120 | data[31] = 0x85; | |
121 | ||
122 | /* "The new checksum via recomputation is: | |
123 | ||
124 | HC' = ~(0xCD7A + 0x3285) | |
125 | = ~0xFFFF | |
126 | = 0x0000" | |
127 | */ | |
128 | assert(ntohs(csum(data, sizeof data)) == 0x0000); | |
129 | ||
130 | /* "Applying [Eqn. 3] to the example above, we get the correct result: | |
131 | ||
132 | HC' = ~(C + (-m) + m') | |
133 | = ~(0x22D0 + ~0x5555 + 0x3285) | |
134 | = ~0xFFFF | |
135 | = 0x0000" */ | |
d84d4b88 BP |
136 | assert(recalc_csum16(htons(0xdd2f), htons(0x5555), htons(0x3285)) |
137 | == htons(0x0000)); | |
21effc03 BP |
138 | |
139 | mark('#'); | |
140 | } | |
141 | ||
97025b23 JS |
142 | /* CRC32C checksum tests, based on Intel IPPs, Chapter 13, |
143 | * ippsCRC32C_8u() example, found at the following location: | |
144 | * http://software.intel.com/sites/products/documentation/hpc/ipp/ipps/ */ | |
145 | static void | |
146 | test_crc32c(void) | |
147 | { | |
148 | int i; | |
149 | uint8_t data[48] = { | |
150 | 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
151 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
152 | 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, | |
153 | 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, | |
154 | 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, | |
155 | 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 | |
156 | }; | |
157 | ||
158 | /* iSCSI Read PDU */ | |
159 | assert(ntohl(crc32c(data, 48)) == 0x563a96d9L); | |
160 | ||
161 | /* 32 bytes of all zeroes */ | |
162 | for (i = 0; i < 32; i++) data[i] = 0x00; | |
163 | assert(ntohl(crc32c(data, 32)) == 0xaa36918aL); | |
164 | ||
165 | /* 32 bytes of all ones */ | |
166 | for (i = 0; i < 32; i++) data[i] = 0xff; | |
167 | assert(ntohl(crc32c(data, 32)) == 0x43aba862L); | |
168 | ||
169 | /* 32 bytes of incrementing 00..1f */ | |
170 | for (i = 0; i < 32; i++) data[i] = i; | |
171 | assert(ntohl(crc32c(data, 32)) == 0x4e79dd46L); | |
172 | ||
173 | /* 32 bytes of decrementing 1f..00 */ | |
174 | for (i = 0; i < 32; i++) data[i] = 31 - i; | |
175 | assert(ntohl(crc32c(data, 32)) == 0x5cdb3f11L); | |
176 | ||
177 | mark('#'); | |
178 | } | |
179 | ||
0292a0c9 JG |
180 | /* Check the IP pseudoheader calculation. */ |
181 | static void | |
182 | test_pseudo(void) | |
183 | { | |
2f86335b | 184 | ovs_be16 csum; |
0292a0c9 JG |
185 | /* Try an IP header similar to one that the tunnel code |
186 | * might generate. */ | |
187 | struct ip_header ip = { | |
188 | .ip_ihl_ver = IP_IHL_VER(5, 4), | |
189 | .ip_tos = 0, | |
190 | .ip_tot_len = htons(134), | |
191 | .ip_id = 0, | |
192 | .ip_frag_off = htons(IP_DF), | |
193 | .ip_ttl = 64, | |
194 | .ip_proto = IPPROTO_UDP, | |
195 | .ip_csum = htons(0x1265), | |
196 | .ip_src = { .hi = htons(0x1400), .lo = htons(0x0002) }, | |
197 | .ip_dst = { .hi = htons(0x1400), .lo = htons(0x0001) } | |
198 | }; | |
199 | ||
2f86335b FL |
200 | csum = csum_finish(packet_csum_pseudoheader(&ip)); |
201 | assert(csum == htons(0xd779)); | |
0292a0c9 JG |
202 | |
203 | /* And also test something totally different to check for | |
204 | * corner cases. */ | |
205 | memset(&ip, 0xff, sizeof ip); | |
2f86335b FL |
206 | csum = csum_finish(packet_csum_pseudoheader(&ip)); |
207 | assert(csum == htons(0xff3c)); | |
0292a0c9 JG |
208 | |
209 | mark('#'); | |
210 | } | |
eadd1644 AZ |
211 | |
212 | static void | |
213 | test_csum_main(int argc OVS_UNUSED, char *argv[] OVS_UNUSED) | |
21effc03 BP |
214 | { |
215 | const struct test_case *tc; | |
216 | int i; | |
217 | ||
218 | for (tc = test_cases; tc < &test_cases[ARRAY_SIZE(test_cases)]; tc++) { | |
e7b3e606 BP |
219 | const void *data = tc->data; |
220 | const ovs_be16 *data16 = (OVS_FORCE const ovs_be16 *) data; | |
221 | const ovs_be32 *data32 = (OVS_FORCE const ovs_be32 *) data; | |
21effc03 | 222 | uint32_t partial; |
21effc03 BP |
223 | |
224 | /* Test csum(). */ | |
225 | assert(ntohs(csum(tc->data, tc->size)) == tc->csum); | |
226 | mark('.'); | |
227 | ||
228 | /* Test csum_add16(). */ | |
229 | partial = 0; | |
230 | for (i = 0; i < tc->size / 2; i++) { | |
d84d4b88 | 231 | partial = csum_add16(partial, get_unaligned_be16(&data16[i])); |
21effc03 BP |
232 | } |
233 | assert(ntohs(csum_finish(partial)) == tc->csum); | |
234 | mark('.'); | |
235 | ||
236 | /* Test csum_add32(). */ | |
237 | partial = 0; | |
238 | for (i = 0; i < tc->size / 4; i++) { | |
d84d4b88 | 239 | partial = csum_add32(partial, get_unaligned_be32(&data32[i])); |
21effc03 BP |
240 | } |
241 | assert(ntohs(csum_finish(partial)) == tc->csum); | |
242 | mark('.'); | |
243 | ||
244 | /* Test alternating csum_add16() and csum_add32(). */ | |
245 | partial = 0; | |
246 | for (i = 0; i < tc->size / 4; i++) { | |
247 | if (i % 2) { | |
d84d4b88 | 248 | partial = csum_add32(partial, get_unaligned_be32(&data32[i])); |
21effc03 | 249 | } else { |
d84d4b88 BP |
250 | ovs_be16 u0 = get_unaligned_be16(&data16[i * 2]); |
251 | ovs_be16 u1 = get_unaligned_be16(&data16[i * 2 + 1]); | |
80642190 BP |
252 | partial = csum_add16(partial, u0); |
253 | partial = csum_add16(partial, u1); | |
21effc03 BP |
254 | } |
255 | } | |
256 | assert(ntohs(csum_finish(partial)) == tc->csum); | |
257 | mark('.'); | |
258 | ||
259 | /* Test csum_continue(). */ | |
260 | partial = 0; | |
261 | for (i = 0; i < tc->size / 4; i++) { | |
262 | if (i) { | |
263 | partial = csum_continue(partial, &data32[i], 4); | |
264 | } else { | |
265 | partial = csum_continue(partial, &data16[i * 2], 2); | |
266 | partial = csum_continue(partial, &data16[i * 2 + 1], 2); | |
267 | } | |
268 | } | |
269 | assert(ntohs(csum_finish(partial)) == tc->csum); | |
270 | mark('#'); | |
271 | } | |
272 | ||
273 | test_rfc1624(); | |
97025b23 | 274 | test_crc32c(); |
0292a0c9 | 275 | test_pseudo(); |
21effc03 BP |
276 | |
277 | /* Test recalc_csum16(). */ | |
278 | for (i = 0; i < 32; i++) { | |
d84d4b88 BP |
279 | ovs_be16 old_u16, new_u16; |
280 | ovs_be16 old_csum; | |
281 | ovs_be16 data[16]; | |
21effc03 BP |
282 | int j, index; |
283 | ||
284 | for (j = 0; j < ARRAY_SIZE(data); j++) { | |
d84d4b88 | 285 | data[j] = (OVS_FORCE ovs_be16) random_uint32(); |
21effc03 BP |
286 | } |
287 | old_csum = csum(data, sizeof data); | |
288 | index = random_range(ARRAY_SIZE(data)); | |
289 | old_u16 = data[index]; | |
d84d4b88 | 290 | new_u16 = data[index] = (OVS_FORCE ovs_be16) random_uint32(); |
21effc03 BP |
291 | assert(csum(data, sizeof data) |
292 | == recalc_csum16(old_csum, old_u16, new_u16)); | |
293 | mark('.'); | |
294 | } | |
295 | mark('#'); | |
296 | ||
297 | /* Test recalc_csum32(). */ | |
298 | for (i = 0; i < 32; i++) { | |
d84d4b88 BP |
299 | ovs_be32 old_u32, new_u32; |
300 | ovs_be16 old_csum; | |
301 | ovs_be32 data[16]; | |
21effc03 BP |
302 | int j, index; |
303 | ||
304 | for (j = 0; j < ARRAY_SIZE(data); j++) { | |
d84d4b88 | 305 | data[j] = (OVS_FORCE ovs_be32) random_uint32(); |
21effc03 BP |
306 | } |
307 | old_csum = csum(data, sizeof data); | |
308 | index = random_range(ARRAY_SIZE(data)); | |
309 | old_u32 = data[index]; | |
d84d4b88 | 310 | new_u32 = data[index] = (OVS_FORCE ovs_be32) random_uint32(); |
21effc03 BP |
311 | assert(csum(data, sizeof data) |
312 | == recalc_csum32(old_csum, old_u32, new_u32)); | |
313 | mark('.'); | |
314 | } | |
315 | mark('#'); | |
316 | ||
317 | putchar('\n'); | |
21effc03 | 318 | } |
eadd1644 AZ |
319 | |
320 | OVSTEST_REGISTER("test-csum", test_csum_main); |