6233bce731b784459e41f6abcb183f893acb41b7
[openwrt/openwrt.git] / package / network / ipv6 / map / src / mapcalc.c
1 /*
2 * mapcalc - MAP parameter calculation
3 *
4 * Author: Steven Barth <cyrus@openwrt.org>
5 * Copyright (c) 2014-2015 cisco Systems, Inc.
6 * Copyright (c) 2015 Steven Barth <cyrus@openwrt.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2
10 * as published by the Free Software Foundation
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18 #include <stdlib.h>
19 #include <stdio.h>
20 #include <arpa/inet.h>
21 #include <errno.h>
22 #include <libubus.h>
23 #include <libubox/utils.h>
24
25
26 struct blob_attr *dump = NULL;
27
28 enum {
29 DUMP_ATTR_INTERFACE,
30 DUMP_ATTR_MAX
31 };
32
33 static const struct blobmsg_policy dump_attrs[DUMP_ATTR_MAX] = {
34 [DUMP_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_ARRAY },
35 };
36
37
38 enum {
39 IFACE_ATTR_INTERFACE,
40 IFACE_ATTR_PREFIX,
41 IFACE_ATTR_ADDRESS,
42 IFACE_ATTR_MAX,
43 };
44
45 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
46 [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
47 [IFACE_ATTR_PREFIX] = { .name = "ipv6-prefix", .type = BLOBMSG_TYPE_ARRAY },
48 [IFACE_ATTR_ADDRESS] = { .name = "ipv6-address", .type = BLOBMSG_TYPE_ARRAY },
49 };
50
51
52 enum {
53 PREFIX_ATTR_ADDRESS,
54 PREFIX_ATTR_MASK,
55 PREFIX_ATTR_MAX,
56 };
57
58 static const struct blobmsg_policy prefix_attrs[PREFIX_ATTR_MAX] = {
59 [PREFIX_ATTR_ADDRESS] = { .name = "address", .type = BLOBMSG_TYPE_STRING },
60 [PREFIX_ATTR_MASK] = { .name = "mask", .type = BLOBMSG_TYPE_INT32 },
61 };
62
63 static int bmemcmp(const void *av, const void *bv, size_t bits)
64 {
65 const uint8_t *a = av, *b = bv;
66 size_t bytes = bits / 8;
67 bits %= 8;
68
69 int res = memcmp(a, b, bytes);
70 if (res == 0 && bits > 0)
71 res = (a[bytes] >> (8 - bits)) - (b[bytes] >> (8 - bits));
72
73 return res;
74 }
75
76 static void bmemcpy(void *av, const void *bv, size_t bits)
77 {
78 uint8_t *a = av;
79 const uint8_t *b = bv;
80
81 size_t bytes = bits / 8;
82 bits %= 8;
83 memcpy(a, b, bytes);
84
85 if (bits > 0) {
86 uint8_t mask = (1 << (8 - bits)) - 1;
87 a[bytes] = (a[bytes] & mask) | ((~mask) & b[bytes]);
88 }
89 }
90
91 static void bmemcpys64(void *av, const void *bv, size_t frombits, size_t nbits)
92 {
93 uint64_t buf = 0;
94 const uint8_t *b = bv;
95 size_t frombyte = frombits / 8, tobyte = (frombits + nbits) / 8;
96
97 memcpy(&buf, &b[frombyte], tobyte - frombyte + 1);
98 buf = cpu_to_be64(be64_to_cpu(buf) << (frombits % 8));
99
100 bmemcpy(av, &buf, nbits);
101 }
102
103 static void handle_dump(struct ubus_request *req __attribute__((unused)),
104 int type __attribute__((unused)), struct blob_attr *msg)
105 {
106 struct blob_attr *tb[DUMP_ATTR_INTERFACE];
107 blobmsg_parse(dump_attrs, DUMP_ATTR_MAX, tb, blob_data(msg), blob_len(msg));
108
109 if (!tb[DUMP_ATTR_INTERFACE])
110 return;
111
112 dump = blob_memdup(tb[DUMP_ATTR_INTERFACE]);
113 }
114
115 static void match_prefix(int *pdlen, struct in6_addr *pd, struct blob_attr *cur,
116 const struct in6_addr *ipv6prefix, int prefix6len, bool lw4o6)
117 {
118 struct blob_attr *d;
119 unsigned drem;
120
121 if (!cur || blobmsg_type(cur) != BLOBMSG_TYPE_ARRAY || !blobmsg_check_attr(cur, false))
122 return;
123
124 blobmsg_for_each_attr(d, cur, drem) {
125 struct blob_attr *ptb[PREFIX_ATTR_MAX];
126 blobmsg_parse(prefix_attrs, PREFIX_ATTR_MAX, ptb,
127 blobmsg_data(d), blobmsg_data_len(d));
128
129 if (!ptb[PREFIX_ATTR_ADDRESS] || !ptb[PREFIX_ATTR_MASK])
130 continue;
131
132 struct in6_addr prefix = IN6ADDR_ANY_INIT;
133 int mask = blobmsg_get_u32(ptb[PREFIX_ATTR_MASK]);
134 inet_pton(AF_INET6, blobmsg_get_string(ptb[PREFIX_ATTR_ADDRESS]), &prefix);
135
136 // lw4over6 /128-address-as-PD matching madness workaround
137 if (lw4o6 && mask == 128)
138 mask = 64;
139
140 if (*pdlen < mask && mask >= prefix6len &&
141 !bmemcmp(&prefix, ipv6prefix, prefix6len)) {
142 bmemcpy(pd, &prefix, mask);
143 *pdlen = mask;
144 } else if (lw4o6 && *pdlen < prefix6len && mask < prefix6len &&
145 !bmemcmp(&prefix, ipv6prefix, mask)) {
146 bmemcpy(pd, ipv6prefix, prefix6len);
147 *pdlen = prefix6len;
148 }
149 }
150 }
151
152 enum {
153 OPT_TYPE,
154 OPT_FMR,
155 OPT_EALEN,
156 OPT_PREFIX4LEN,
157 OPT_PREFIX6LEN,
158 OPT_IPV6PREFIX,
159 OPT_IPV4PREFIX,
160 OPT_OFFSET,
161 OPT_PSIDLEN,
162 OPT_PSID,
163 OPT_BR,
164 OPT_DMR,
165 OPT_PD,
166 OPT_PDLEN,
167 OPT_MAX
168 };
169
170 static char *const token[] = {
171 [OPT_TYPE] = "type",
172 [OPT_FMR] = "fmr",
173 [OPT_EALEN] = "ealen",
174 [OPT_PREFIX4LEN] = "prefix4len",
175 [OPT_PREFIX6LEN] = "prefix6len",
176 [OPT_IPV6PREFIX] = "ipv6prefix",
177 [OPT_IPV4PREFIX] = "ipv4prefix",
178 [OPT_OFFSET] = "offset",
179 [OPT_PSIDLEN] = "psidlen",
180 [OPT_PSID] = "psid",
181 [OPT_BR] = "br",
182 [OPT_DMR] = "dmr",
183 [OPT_PD] = "pd",
184 [OPT_PDLEN] = "pdlen",
185 [OPT_MAX] = NULL
186 };
187
188
189 int main(int argc, char *argv[])
190 {
191 int status = 0;
192 const char *iface = argv[1];
193
194 const char *legacy_env = getenv("LEGACY");
195 bool legacy = legacy_env && atoi(legacy_env);
196
197
198 if (argc < 3) {
199 fprintf(stderr, "Usage: %s <interface|*> <rule1> [rule2] [...]\n", argv[0]);
200 return 1;
201 }
202
203 uint32_t network_interface;
204 struct ubus_context *ubus = ubus_connect(NULL);
205 if (ubus) {
206 ubus_lookup_id(ubus, "network.interface", &network_interface);
207 ubus_invoke(ubus, network_interface, "dump", NULL, handle_dump, NULL, 5000);
208 }
209
210 int rulecnt = 0;
211 for (int i = 2; i < argc; ++i) {
212 bool lw4o6 = false;
213 bool fmr = false;
214 int ealen = -1;
215 int addr4len = 32;
216 int prefix4len = 32;
217 int prefix6len = -1;
218 int pdlen = -1;
219 struct in_addr ipv4prefix = {INADDR_ANY};
220 struct in_addr ipv4addr = {INADDR_ANY};
221 struct in6_addr ipv6addr = IN6ADDR_ANY_INIT;
222 struct in6_addr ipv6prefix = IN6ADDR_ANY_INIT;
223 struct in6_addr pd = IN6ADDR_ANY_INIT;
224 int offset = -1;
225 int psidlen = -1;
226 int psid = -1;
227 uint16_t psid16 = 0;
228 const char *dmr = NULL;
229 const char *br = NULL;
230
231 for (char *rule = strdup(argv[i]); *rule; ) {
232 char *value;
233 int intval;
234 int idx = getsubopt(&rule, token, &value);
235 errno = 0;
236
237 if (idx == OPT_TYPE) {
238 lw4o6 = (value && !strcmp(value, "lw4o6"));
239 } else if (idx == OPT_FMR) {
240 fmr = true;
241 } else if (idx == OPT_EALEN && (intval = strtoul(value, NULL, 0)) <= 48 && !errno) {
242 ealen = intval;
243 } else if (idx == OPT_PREFIX4LEN && (intval = strtoul(value, NULL, 0)) <= 32 && !errno) {
244 prefix4len = intval;
245 } else if (idx == OPT_PREFIX6LEN && (intval = strtoul(value, NULL, 0)) <= 128 && !errno) {
246 prefix6len = intval;
247 } else if (idx == OPT_IPV4PREFIX && inet_pton(AF_INET, value, &ipv4prefix) == 1) {
248 // dummy
249 } else if (idx == OPT_IPV6PREFIX && inet_pton(AF_INET6, value, &ipv6prefix) == 1) {
250 // dummy
251 } else if (idx == OPT_PD && inet_pton(AF_INET6, value, &pd) == 1) {
252 // dummy
253 } else if (idx == OPT_OFFSET && (intval = strtoul(value, NULL, 0)) <= 16 && !errno) {
254 offset = intval;
255 } else if (idx == OPT_PSIDLEN && (intval = strtoul(value, NULL, 0)) <= 16 && !errno) {
256 psidlen = intval;
257 } else if (idx == OPT_PDLEN && (intval = strtoul(value, NULL, 0)) <= 128 && !errno) {
258 pdlen = intval;
259 } else if (idx == OPT_PSID && (intval = strtoul(value, NULL, 0)) <= 65535 && !errno) {
260 psid = intval;
261 } else if (idx == OPT_DMR) {
262 dmr = value;
263 } else if (idx == OPT_BR) {
264 br = value;
265 } else {
266 if (idx == -1 || idx >= OPT_MAX)
267 fprintf(stderr, "Skipped invalid option: %s\n", value);
268 else
269 fprintf(stderr, "Skipped invalid value %s for option %s\n",
270 value, token[idx]);
271 }
272 }
273
274 if (offset < 0)
275 offset = (lw4o6) ? 0 : (legacy) ? 4 : 6;
276
277 // LW4over6 doesn't have an EALEN and has no psid-autodetect
278 if (lw4o6) {
279 if (psidlen < 0)
280 psidlen = 0;
281
282 ealen = psidlen;
283 }
284
285 // Find PD
286 if (pdlen < 0) {
287 struct blob_attr *c;
288 unsigned rem;
289 blobmsg_for_each_attr(c, dump, rem) {
290 struct blob_attr *tb[IFACE_ATTR_MAX];
291 blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, blobmsg_data(c), blobmsg_data_len(c));
292
293 if (!tb[IFACE_ATTR_INTERFACE] || (strcmp(argv[1], "*") && strcmp(argv[1],
294 blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]))))
295 continue;
296
297 match_prefix(&pdlen, &pd, tb[IFACE_ATTR_PREFIX], &ipv6prefix, prefix6len, lw4o6);
298
299 if (lw4o6)
300 match_prefix(&pdlen, &pd, tb[IFACE_ATTR_ADDRESS], &ipv6prefix, prefix6len, lw4o6);
301
302 if (pdlen >= 0) {
303 iface = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
304 break;
305 }
306 }
307 }
308
309 if (ealen < 0 && pdlen >= 0)
310 ealen = pdlen - prefix6len;
311
312 if (psidlen <= 0) {
313 psidlen = ealen - (32 - prefix4len);
314 psid = -1;
315 }
316
317 if (psid < 0 && psidlen <= 16 && psidlen >= 0 && pdlen >= 0 && ealen >= psidlen) {
318 bmemcpys64(&psid16, &pd, prefix6len + ealen - psidlen, psidlen);
319 psid = be16_to_cpu(psid16);
320 }
321
322 psid = psid >> (16 - psidlen);
323 psid16 = cpu_to_be16(psid);
324 psid = psid << (16 - psidlen);
325
326 if (prefix4len < 0 || prefix6len < 0 || ealen < 0 || ealen < psidlen) {
327 fprintf(stderr, "Skipping invalid or incomplete rule: %s\n", argv[i]);
328 status = 1;
329 continue;
330 }
331
332 if ((pdlen >= 0 || ealen == psidlen) && ealen >= psidlen) {
333 bmemcpys64(&ipv4addr, &pd, prefix6len, ealen - psidlen);
334 ipv4addr.s_addr = htonl(ntohl(ipv4addr.s_addr) >> prefix4len);
335 bmemcpy(&ipv4addr, &ipv4prefix, prefix4len);
336
337 if (prefix4len + ealen < 32)
338 addr4len = prefix4len + ealen;
339 }
340
341 if (pdlen < 0 && !fmr) {
342 fprintf(stderr, "Skipping non-FMR without matching PD: %s\n", argv[i]);
343 status = 1;
344 continue;
345 } else if (pdlen >= 0) {
346 size_t v4offset = (legacy) ? 9 : 10;
347 memcpy(&ipv6addr.s6_addr[v4offset], &ipv4addr, 4);
348 memcpy(&ipv6addr.s6_addr[v4offset + 4], &psid16, 2);
349 bmemcpy(&ipv6addr, &pd, pdlen);
350 }
351
352 ++rulecnt;
353 char ipv4addrbuf[INET_ADDRSTRLEN];
354 char ipv4prefixbuf[INET_ADDRSTRLEN];
355 char ipv6prefixbuf[INET6_ADDRSTRLEN];
356 char ipv6addrbuf[INET6_ADDRSTRLEN];
357 char pdbuf[INET6_ADDRSTRLEN];
358
359 inet_ntop(AF_INET, &ipv4addr, ipv4addrbuf, sizeof(ipv4addrbuf));
360 inet_ntop(AF_INET, &ipv4prefix, ipv4prefixbuf, sizeof(ipv4prefixbuf));
361 inet_ntop(AF_INET6, &ipv6prefix, ipv6prefixbuf, sizeof(ipv6prefixbuf));
362 inet_ntop(AF_INET6, &ipv6addr, ipv6addrbuf, sizeof(ipv6addrbuf));
363 inet_ntop(AF_INET6, &pd, pdbuf, sizeof(pdbuf));
364
365 printf("RULE_%d_FMR=%d\n", rulecnt, fmr);
366 printf("RULE_%d_EALEN=%d\n", rulecnt, ealen);
367 printf("RULE_%d_PSIDLEN=%d\n", rulecnt, psidlen);
368 printf("RULE_%d_OFFSET=%d\n", rulecnt, offset);
369 printf("RULE_%d_PREFIX4LEN=%d\n", rulecnt, prefix4len);
370 printf("RULE_%d_PREFIX6LEN=%d\n", rulecnt, prefix6len);
371 printf("RULE_%d_IPV4PREFIX=%s\n", rulecnt, ipv4prefixbuf);
372 printf("RULE_%d_IPV6PREFIX=%s\n", rulecnt, ipv6prefixbuf);
373
374 if (pdlen >= 0) {
375 printf("RULE_%d_IPV6PD=%s\n", rulecnt, pdbuf);
376 printf("RULE_%d_PD6LEN=%d\n", rulecnt, pdlen);
377 printf("RULE_%d_PD6IFACE=%s\n", rulecnt, iface);
378 printf("RULE_%d_IPV6ADDR=%s\n", rulecnt, ipv6addrbuf);
379 printf("RULE_BMR=%d\n", rulecnt);
380 }
381
382 if (ipv4addr.s_addr) {
383 printf("RULE_%d_IPV4ADDR=%s\n", rulecnt, ipv4addrbuf);
384 printf("RULE_%d_ADDR4LEN=%d\n", rulecnt, addr4len);
385 }
386
387
388 if (psidlen > 0 && psid >= 0) {
389 printf("RULE_%d_PORTSETS='", rulecnt);
390 for (int k = (offset) ? 1 : 0; k < (1 << offset); ++k) {
391 int start = (k << (16 - offset)) | (psid >> offset);
392 int end = start + (1 << (16 - offset - psidlen)) - 1;
393
394 if (start == 0)
395 start = 1;
396
397 if (start <= end)
398 printf("%d-%d ", start, end);
399 }
400 printf("'\n");
401 }
402
403 if (dmr)
404 printf("RULE_%d_DMR=%s\n", rulecnt, dmr);
405
406 if (br)
407 printf("RULE_%d_BR=%s\n", rulecnt, br);
408 }
409
410 printf("RULE_COUNT=%d\n", rulecnt);
411 return status;
412 }