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034cdee9 PG |
1 | /* BGP FlowSpec Utilities |
2 | * Portions: | |
3 | * Copyright (C) 2017 ChinaTelecom SDN Group | |
4 | * Copyright (C) 2018 6WIND | |
5 | * | |
6 | * FRRouting is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the | |
8 | * Free Software Foundation; either version 2, or (at your option) any | |
9 | * later version. | |
10 | * | |
11 | * FRRouting is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "zebra.h" | |
22 | ||
23 | #include "prefix.h" | |
02705213 | 24 | #include "lib_errors.h" |
98a9dbc7 | 25 | |
0378bcaa | 26 | #include "bgp_route.h" |
98a9dbc7 | 27 | #include "bgp_table.h" |
034cdee9 | 28 | #include "bgp_flowspec_util.h" |
98a9dbc7 | 29 | #include "bgp_flowspec_private.h" |
47555ee9 | 30 | #include "bgp_pbr.h" |
4f3be667 | 31 | #include "bgp_errors.h" |
034cdee9 PG |
32 | |
33 | static void hex2bin(uint8_t *hex, int *bin) | |
34 | { | |
35 | int remainder = *hex; | |
36 | int i = 0; | |
37 | ||
38 | while (remainder >= 1 && i < 8) { | |
39 | bin[7-i] = remainder % 2; | |
40 | remainder = remainder / 2; | |
41 | i++; | |
42 | } | |
43 | for (; i < 8; i++) | |
44 | bin[7-i] = 0; | |
45 | } | |
46 | ||
47 | static int hexstr2num(uint8_t *hexstr, int len) | |
48 | { | |
49 | int i = 0; | |
50 | int num = 0; | |
51 | ||
52 | for (i = 0; i < len; i++) | |
53 | num = hexstr[i] + 16*16*num; | |
54 | return num; | |
55 | } | |
56 | ||
47555ee9 PG |
57 | /* call bgp_flowspec_op_decode |
58 | * returns offset | |
59 | */ | |
60 | static int bgp_flowspec_call_non_opaque_decode(uint8_t *nlri_content, int len, | |
61 | struct bgp_pbr_match_val *mval, | |
62 | uint8_t *match_num, int *error) | |
63 | { | |
64 | int ret; | |
65 | ||
66 | ret = bgp_flowspec_op_decode( | |
67 | BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE, | |
68 | nlri_content, | |
69 | len, | |
70 | mval, error); | |
71 | if (*error < 0) | |
e50f7cfd | 72 | flog_err(EC_BGP_FLOWSPEC_PACKET, |
1c50c1c0 | 73 | "%s: flowspec_op_decode error %d", __func__, *error); |
47555ee9 PG |
74 | else |
75 | *match_num = *error; | |
76 | return ret; | |
77 | } | |
78 | ||
bd494ec5 DS |
79 | bool bgp_flowspec_contains_prefix(const struct prefix *pfs, |
80 | struct prefix *input, int prefix_check) | |
47555ee9 PG |
81 | { |
82 | uint32_t offset = 0; | |
83 | int type; | |
84 | int ret = 0, error = 0; | |
85 | uint8_t *nlri_content = (uint8_t *)pfs->u.prefix_flowspec.ptr; | |
86 | size_t len = pfs->u.prefix_flowspec.prefixlen; | |
87 | struct prefix compare; | |
88 | ||
89 | error = 0; | |
90 | while (offset < len-1 && error >= 0) { | |
91 | type = nlri_content[offset]; | |
92 | offset++; | |
93 | switch (type) { | |
94 | case FLOWSPEC_DEST_PREFIX: | |
95 | case FLOWSPEC_SRC_PREFIX: | |
96 | memset(&compare, 0, sizeof(struct prefix)); | |
97 | ret = bgp_flowspec_ip_address( | |
98 | BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE, | |
99 | nlri_content+offset, | |
100 | len - offset, | |
101 | &compare, &error); | |
102 | if (ret <= 0) | |
103 | break; | |
104 | if (prefix_check && | |
105 | compare.prefixlen != input->prefixlen) | |
106 | break; | |
107 | if (compare.family != input->family) | |
108 | break; | |
109 | if ((input->family == AF_INET) && | |
110 | IPV4_ADDR_SAME(&input->u.prefix4, | |
111 | &compare.u.prefix4)) | |
112 | return true; | |
113 | if ((input->family == AF_INET6) && | |
114 | IPV6_ADDR_SAME(&input->u.prefix6.s6_addr, | |
115 | &compare.u.prefix6.s6_addr)) | |
116 | return true; | |
117 | break; | |
118 | case FLOWSPEC_IP_PROTOCOL: | |
119 | case FLOWSPEC_PORT: | |
120 | case FLOWSPEC_DEST_PORT: | |
121 | case FLOWSPEC_SRC_PORT: | |
122 | case FLOWSPEC_ICMP_TYPE: | |
123 | case FLOWSPEC_ICMP_CODE: | |
124 | ret = bgp_flowspec_op_decode(BGP_FLOWSPEC_VALIDATE_ONLY, | |
125 | nlri_content+offset, | |
126 | len - offset, | |
127 | NULL, &error); | |
128 | break; | |
588ec356 | 129 | case FLOWSPEC_FRAGMENT: |
47555ee9 | 130 | case FLOWSPEC_TCP_FLAGS: |
588ec356 | 131 | ret = bgp_flowspec_bitmask_decode( |
47555ee9 PG |
132 | BGP_FLOWSPEC_VALIDATE_ONLY, |
133 | nlri_content+offset, | |
134 | len - offset, | |
135 | NULL, &error); | |
136 | break; | |
137 | case FLOWSPEC_PKT_LEN: | |
138 | case FLOWSPEC_DSCP: | |
139 | ret = bgp_flowspec_op_decode( | |
140 | BGP_FLOWSPEC_VALIDATE_ONLY, | |
141 | nlri_content + offset, | |
142 | len - offset, NULL, | |
143 | &error); | |
144 | break; | |
47555ee9 PG |
145 | default: |
146 | error = -1; | |
147 | break; | |
148 | } | |
149 | offset += ret; | |
150 | } | |
151 | return false; | |
152 | } | |
034cdee9 PG |
153 | |
154 | /* | |
155 | * handle the flowspec address src/dst or generic address NLRI | |
156 | * return number of bytes analysed ( >= 0). | |
157 | */ | |
158 | int bgp_flowspec_ip_address(enum bgp_flowspec_util_nlri_t type, | |
159 | uint8_t *nlri_ptr, | |
160 | uint32_t max_len, | |
161 | void *result, int *error) | |
162 | { | |
163 | char *display = (char *)result; /* for return_string */ | |
164 | struct prefix *prefix = (struct prefix *)result; | |
165 | uint32_t offset = 0; | |
166 | struct prefix prefix_local; | |
167 | int psize; | |
168 | ||
169 | *error = 0; | |
170 | memset(&prefix_local, 0, sizeof(struct prefix)); | |
171 | /* read the prefix length */ | |
172 | prefix_local.prefixlen = nlri_ptr[offset]; | |
173 | psize = PSIZE(prefix_local.prefixlen); | |
174 | offset++; | |
175 | /* TODO Flowspec IPv6 Support */ | |
176 | prefix_local.family = AF_INET; | |
177 | /* Prefix length check. */ | |
178 | if (prefix_local.prefixlen > prefix_blen(&prefix_local) * 8) | |
179 | *error = -1; | |
180 | /* When packet overflow occur return immediately. */ | |
181 | if (psize + offset > max_len) | |
182 | *error = -1; | |
183 | /* Defensive coding, double-check | |
184 | * the psize fits in a struct prefix | |
185 | */ | |
186 | if (psize > (ssize_t)sizeof(prefix_local.u)) | |
187 | *error = -1; | |
188 | memcpy(&prefix_local.u.prefix, &nlri_ptr[offset], psize); | |
189 | offset += psize; | |
190 | switch (type) { | |
191 | case BGP_FLOWSPEC_RETURN_STRING: | |
192 | prefix2str(&prefix_local, display, | |
193 | BGP_FLOWSPEC_STRING_DISPLAY_MAX); | |
194 | break; | |
195 | case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE: | |
196 | PREFIX_COPY_IPV4(prefix, &prefix_local) | |
197 | break; | |
198 | case BGP_FLOWSPEC_VALIDATE_ONLY: | |
199 | default: | |
200 | break; | |
201 | } | |
202 | return offset; | |
203 | } | |
204 | ||
205 | /* | |
206 | * handle the flowspec operator NLRI | |
207 | * return number of bytes analysed | |
208 | * if there is an error, the passed error param is used to give error: | |
209 | * -1 if decoding error, | |
362a06e3 PG |
210 | * if result is a string, its assumed length |
211 | * is BGP_FLOWSPEC_STRING_DISPLAY_MAX | |
034cdee9 PG |
212 | */ |
213 | int bgp_flowspec_op_decode(enum bgp_flowspec_util_nlri_t type, | |
214 | uint8_t *nlri_ptr, | |
215 | uint32_t max_len, | |
216 | void *result, int *error) | |
217 | { | |
218 | int op[8]; | |
219 | int len, value, value_size; | |
220 | int loop = 0; | |
221 | char *ptr = (char *)result; /* for return_string */ | |
222 | uint32_t offset = 0; | |
362a06e3 PG |
223 | int len_string = BGP_FLOWSPEC_STRING_DISPLAY_MAX; |
224 | int len_written; | |
47555ee9 | 225 | struct bgp_pbr_match_val *mval = (struct bgp_pbr_match_val *)result; |
034cdee9 PG |
226 | |
227 | *error = 0; | |
228 | do { | |
47555ee9 PG |
229 | if (loop > BGP_PBR_MATCH_VAL_MAX) |
230 | *error = -2; | |
034cdee9 PG |
231 | hex2bin(&nlri_ptr[offset], op); |
232 | offset++; | |
233 | len = 2*op[2]+op[3]; | |
234 | value_size = 1 << len; | |
235 | value = hexstr2num(&nlri_ptr[offset], value_size); | |
236 | /* can not be < and > at the same time */ | |
237 | if (op[5] == 1 && op[6] == 1) | |
238 | *error = -1; | |
239 | /* if first element, AND bit can not be set */ | |
240 | if (op[1] == 1 && loop == 0) | |
241 | *error = -1; | |
242 | switch (type) { | |
243 | case BGP_FLOWSPEC_RETURN_STRING: | |
362a06e3 PG |
244 | if (loop) { |
245 | len_written = snprintf(ptr, len_string, | |
246 | ", "); | |
247 | len_string -= len_written; | |
248 | ptr += len_written; | |
249 | } | |
250 | if (op[5] == 1) { | |
251 | len_written = snprintf(ptr, len_string, | |
252 | "<"); | |
253 | len_string -= len_written; | |
254 | ptr += len_written; | |
255 | } | |
256 | if (op[6] == 1) { | |
257 | len_written = snprintf(ptr, len_string, | |
258 | ">"); | |
259 | len_string -= len_written; | |
260 | ptr += len_written; | |
261 | } | |
262 | if (op[7] == 1) { | |
263 | len_written = snprintf(ptr, len_string, | |
264 | "="); | |
265 | len_string -= len_written; | |
266 | ptr += len_written; | |
267 | } | |
268 | len_written = snprintf(ptr, len_string, | |
269 | " %d ", value); | |
270 | len_string -= len_written; | |
271 | ptr += len_written; | |
034cdee9 PG |
272 | break; |
273 | case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE: | |
47555ee9 PG |
274 | /* limitation: stop converting */ |
275 | if (*error == -2) | |
276 | break; | |
277 | mval->value = value; | |
278 | if (op[5] == 1) | |
279 | mval->compare_operator |= | |
280 | OPERATOR_COMPARE_LESS_THAN; | |
281 | if (op[6] == 1) | |
282 | mval->compare_operator |= | |
283 | OPERATOR_COMPARE_GREATER_THAN; | |
284 | if (op[7] == 1) | |
285 | mval->compare_operator |= | |
286 | OPERATOR_COMPARE_EQUAL_TO; | |
287 | if (op[1] == 1) | |
288 | mval->unary_operator = OPERATOR_UNARY_AND; | |
289 | else | |
290 | mval->unary_operator = OPERATOR_UNARY_OR; | |
291 | mval++; | |
034cdee9 PG |
292 | break; |
293 | case BGP_FLOWSPEC_VALIDATE_ONLY: | |
294 | default: | |
295 | /* no action */ | |
296 | break; | |
297 | } | |
298 | offset += value_size; | |
299 | loop++; | |
300 | } while (op[0] == 0 && offset < max_len - 1); | |
301 | if (offset > max_len) | |
302 | *error = -1; | |
303 | /* use error parameter to count the number of entries */ | |
304 | if (*error == 0) | |
305 | *error = loop; | |
306 | return offset; | |
307 | } | |
308 | ||
309 | ||
310 | /* | |
588ec356 | 311 | * handle the flowspec tcpflags or fragment field |
034cdee9 PG |
312 | * return number of bytes analysed |
313 | * if there is an error, the passed error param is used to give error: | |
314 | * -1 if decoding error, | |
362a06e3 PG |
315 | * if result is a string, its assumed length |
316 | * is BGP_FLOWSPEC_STRING_DISPLAY_MAX | |
034cdee9 | 317 | */ |
588ec356 | 318 | int bgp_flowspec_bitmask_decode(enum bgp_flowspec_util_nlri_t type, |
034cdee9 PG |
319 | uint8_t *nlri_ptr, |
320 | uint32_t max_len, | |
321 | void *result, int *error) | |
322 | { | |
323 | int op[8]; | |
324 | int len, value_size, loop = 0, value; | |
325 | char *ptr = (char *)result; /* for return_string */ | |
47555ee9 | 326 | struct bgp_pbr_match_val *mval = (struct bgp_pbr_match_val *)result; |
034cdee9 | 327 | uint32_t offset = 0; |
362a06e3 PG |
328 | int len_string = BGP_FLOWSPEC_STRING_DISPLAY_MAX; |
329 | int len_written; | |
034cdee9 PG |
330 | |
331 | *error = 0; | |
332 | do { | |
47555ee9 PG |
333 | if (loop > BGP_PBR_MATCH_VAL_MAX) |
334 | *error = -2; | |
034cdee9 PG |
335 | hex2bin(&nlri_ptr[offset], op); |
336 | /* if first element, AND bit can not be set */ | |
337 | if (op[1] == 1 && loop == 0) | |
338 | *error = -1; | |
339 | offset++; | |
340 | len = 2 * op[2] + op[3]; | |
341 | value_size = 1 << len; | |
342 | value = hexstr2num(&nlri_ptr[offset], value_size); | |
343 | switch (type) { | |
344 | case BGP_FLOWSPEC_RETURN_STRING: | |
362a06e3 PG |
345 | if (op[1] == 1 && loop != 0) { |
346 | len_written = snprintf(ptr, len_string, | |
01ffd28b | 347 | ",&"); |
362a06e3 PG |
348 | len_string -= len_written; |
349 | ptr += len_written; | |
350 | } else if (op[1] == 0 && loop != 0) { | |
351 | len_written = snprintf(ptr, len_string, | |
01ffd28b | 352 | ",|"); |
362a06e3 PG |
353 | len_string -= len_written; |
354 | ptr += len_written; | |
355 | } | |
01ffd28b PG |
356 | if (op[7] == 1) { |
357 | len_written = snprintf(ptr, len_string, | |
358 | "= "); | |
359 | len_string -= len_written; | |
360 | ptr += len_written; | |
361 | } else { | |
362 | len_written = snprintf(ptr, len_string, | |
363 | "∋ "); | |
362a06e3 PG |
364 | len_string -= len_written; |
365 | ptr += len_written; | |
366 | } | |
01ffd28b PG |
367 | if (op[6] == 1) { |
368 | len_written = snprintf(ptr, len_string, | |
369 | "! "); | |
362a06e3 PG |
370 | len_string -= len_written; |
371 | ptr += len_written; | |
372 | } | |
01ffd28b | 373 | len_written = snprintf(ptr, len_string, |
362a06e3 PG |
374 | "%d", value); |
375 | len_string -= len_written; | |
376 | ptr += len_written; | |
034cdee9 PG |
377 | break; |
378 | case BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE: | |
47555ee9 PG |
379 | /* limitation: stop converting */ |
380 | if (*error == -2) | |
381 | break; | |
382 | mval->value = value; | |
383 | if (op[6] == 1) { | |
384 | /* different from */ | |
385 | mval->compare_operator |= | |
386 | OPERATOR_COMPARE_LESS_THAN; | |
387 | mval->compare_operator |= | |
388 | OPERATOR_COMPARE_GREATER_THAN; | |
389 | } else | |
390 | mval->compare_operator |= | |
391 | OPERATOR_COMPARE_EQUAL_TO; | |
392 | if (op[7] == 1) | |
393 | mval->compare_operator |= | |
394 | OPERATOR_COMPARE_EXACT_MATCH; | |
395 | if (op[1] == 1) | |
396 | mval->unary_operator = | |
397 | OPERATOR_UNARY_AND; | |
398 | else | |
399 | mval->unary_operator = | |
400 | OPERATOR_UNARY_OR; | |
401 | mval++; | |
034cdee9 PG |
402 | break; |
403 | case BGP_FLOWSPEC_VALIDATE_ONLY: | |
404 | default: | |
405 | /* no action */ | |
406 | break; | |
407 | } | |
408 | offset += value_size; | |
409 | loop++; | |
410 | } while (op[0] == 0 && offset < max_len - 1); | |
411 | if (offset > max_len) | |
412 | *error = -1; | |
413 | /* use error parameter to count the number of entries */ | |
414 | if (*error == 0) | |
415 | *error = loop; | |
416 | return offset; | |
417 | } | |
418 | ||
47555ee9 PG |
419 | int bgp_flowspec_match_rules_fill(uint8_t *nlri_content, int len, |
420 | struct bgp_pbr_entry_main *bpem) | |
98a9dbc7 | 421 | { |
47555ee9 PG |
422 | int offset = 0, error = 0; |
423 | struct prefix *prefix; | |
424 | struct bgp_pbr_match_val *mval; | |
425 | uint8_t *match_num; | |
426 | uint8_t bitmask = 0; | |
427 | int ret = 0, type; | |
98a9dbc7 | 428 | |
47555ee9 | 429 | while (offset < len - 1 && error >= 0) { |
98a9dbc7 PG |
430 | type = nlri_content[offset]; |
431 | offset++; | |
432 | switch (type) { | |
433 | case FLOWSPEC_DEST_PREFIX: | |
434 | case FLOWSPEC_SRC_PREFIX: | |
47555ee9 PG |
435 | bitmask = 0; |
436 | if (type == FLOWSPEC_DEST_PREFIX) { | |
437 | bitmask |= PREFIX_DST_PRESENT; | |
438 | prefix = &bpem->dst_prefix; | |
439 | } else { | |
440 | bitmask |= PREFIX_SRC_PRESENT; | |
441 | prefix = &bpem->src_prefix; | |
442 | } | |
98a9dbc7 PG |
443 | ret = bgp_flowspec_ip_address( |
444 | BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE, | |
47555ee9 | 445 | nlri_content + offset, |
98a9dbc7 | 446 | len - offset, |
47555ee9 PG |
447 | prefix, &error); |
448 | if (error < 0) | |
e50f7cfd | 449 | flog_err(EC_BGP_FLOWSPEC_PACKET, |
1c50c1c0 QY |
450 | "%s: flowspec_ip_address error %d", |
451 | __func__, error); | |
4c2876fb PG |
452 | else { |
453 | /* if src or dst address is 0.0.0.0, | |
454 | * ignore that rule | |
455 | */ | |
456 | if (prefix->family == AF_INET | |
975a328e | 457 | && prefix->u.prefix4.s_addr == INADDR_ANY) |
5fa779c9 | 458 | bpem->match_bitmask_iprule |= bitmask; |
4c2876fb PG |
459 | else |
460 | bpem->match_bitmask |= bitmask; | |
461 | } | |
47555ee9 | 462 | offset += ret; |
98a9dbc7 PG |
463 | break; |
464 | case FLOWSPEC_IP_PROTOCOL: | |
47555ee9 PG |
465 | match_num = &(bpem->match_protocol_num); |
466 | mval = (struct bgp_pbr_match_val *) | |
467 | &(bpem->protocol); | |
468 | offset += bgp_flowspec_call_non_opaque_decode( | |
469 | nlri_content + offset, | |
470 | len - offset, | |
471 | mval, match_num, | |
472 | &error); | |
473 | break; | |
98a9dbc7 | 474 | case FLOWSPEC_PORT: |
47555ee9 PG |
475 | match_num = &(bpem->match_port_num); |
476 | mval = (struct bgp_pbr_match_val *) | |
477 | &(bpem->port); | |
478 | offset += bgp_flowspec_call_non_opaque_decode( | |
479 | nlri_content + offset, | |
480 | len - offset, | |
481 | mval, match_num, | |
482 | &error); | |
483 | break; | |
98a9dbc7 | 484 | case FLOWSPEC_DEST_PORT: |
47555ee9 PG |
485 | match_num = &(bpem->match_dst_port_num); |
486 | mval = (struct bgp_pbr_match_val *) | |
487 | &(bpem->dst_port); | |
488 | offset += bgp_flowspec_call_non_opaque_decode( | |
489 | nlri_content + offset, | |
490 | len - offset, | |
491 | mval, match_num, | |
492 | &error); | |
493 | break; | |
98a9dbc7 | 494 | case FLOWSPEC_SRC_PORT: |
47555ee9 PG |
495 | match_num = &(bpem->match_src_port_num); |
496 | mval = (struct bgp_pbr_match_val *) | |
497 | &(bpem->src_port); | |
498 | offset += bgp_flowspec_call_non_opaque_decode( | |
499 | nlri_content + offset, | |
500 | len - offset, | |
501 | mval, match_num, | |
502 | &error); | |
503 | break; | |
98a9dbc7 | 504 | case FLOWSPEC_ICMP_TYPE: |
47555ee9 PG |
505 | match_num = &(bpem->match_icmp_type_num); |
506 | mval = (struct bgp_pbr_match_val *) | |
507 | &(bpem->icmp_type); | |
508 | offset += bgp_flowspec_call_non_opaque_decode( | |
509 | nlri_content + offset, | |
510 | len - offset, | |
511 | mval, match_num, | |
512 | &error); | |
98a9dbc7 | 513 | break; |
47555ee9 PG |
514 | case FLOWSPEC_ICMP_CODE: |
515 | match_num = &(bpem->match_icmp_code_num); | |
516 | mval = (struct bgp_pbr_match_val *) | |
517 | &(bpem->icmp_code); | |
518 | offset += bgp_flowspec_call_non_opaque_decode( | |
519 | nlri_content + offset, | |
520 | len - offset, | |
521 | mval, match_num, | |
522 | &error); | |
98a9dbc7 PG |
523 | break; |
524 | case FLOWSPEC_PKT_LEN: | |
47555ee9 PG |
525 | match_num = |
526 | &(bpem->match_packet_length_num); | |
527 | mval = (struct bgp_pbr_match_val *) | |
528 | &(bpem->packet_length); | |
529 | offset += bgp_flowspec_call_non_opaque_decode( | |
530 | nlri_content + offset, | |
531 | len - offset, | |
532 | mval, match_num, | |
533 | &error); | |
534 | break; | |
98a9dbc7 | 535 | case FLOWSPEC_DSCP: |
47555ee9 PG |
536 | match_num = &(bpem->match_dscp_num); |
537 | mval = (struct bgp_pbr_match_val *) | |
538 | &(bpem->dscp); | |
539 | offset += bgp_flowspec_call_non_opaque_decode( | |
540 | nlri_content + offset, | |
541 | len - offset, | |
542 | mval, match_num, | |
543 | &error); | |
544 | break; | |
545 | case FLOWSPEC_TCP_FLAGS: | |
588ec356 | 546 | ret = bgp_flowspec_bitmask_decode( |
47555ee9 PG |
547 | BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE, |
548 | nlri_content + offset, | |
549 | len - offset, | |
550 | &bpem->tcpflags, &error); | |
551 | if (error < 0) | |
1c50c1c0 QY |
552 | flog_err( |
553 | EC_BGP_FLOWSPEC_PACKET, | |
554 | "%s: flowspec_tcpflags_decode error %d", | |
555 | __func__, error); | |
47555ee9 PG |
556 | else |
557 | bpem->match_tcpflags_num = error; | |
558 | /* contains the number of slots used */ | |
559 | offset += ret; | |
98a9dbc7 PG |
560 | break; |
561 | case FLOWSPEC_FRAGMENT: | |
588ec356 | 562 | ret = bgp_flowspec_bitmask_decode( |
47555ee9 PG |
563 | BGP_FLOWSPEC_CONVERT_TO_NON_OPAQUE, |
564 | nlri_content + offset, | |
565 | len - offset, &bpem->fragment, | |
566 | &error); | |
567 | if (error < 0) | |
1c50c1c0 QY |
568 | flog_err( |
569 | EC_BGP_FLOWSPEC_PACKET, | |
570 | "%s: flowspec_fragment_type_decode error %d", | |
571 | __func__, error); | |
47555ee9 | 572 | else |
588ec356 | 573 | bpem->match_fragment_num = error; |
47555ee9 | 574 | offset += ret; |
98a9dbc7 PG |
575 | break; |
576 | default: | |
450971aa | 577 | flog_err(EC_LIB_DEVELOPMENT, "%s: unknown type %d\n", |
1c50c1c0 | 578 | __func__, type); |
98a9dbc7 | 579 | } |
98a9dbc7 | 580 | } |
5fa779c9 PG |
581 | if (bpem->match_packet_length_num || bpem->match_fragment_num || |
582 | bpem->match_tcpflags_num || bpem->match_dscp_num || | |
583 | bpem->match_packet_length_num || bpem->match_icmp_code_num || | |
584 | bpem->match_icmp_type_num || bpem->match_port_num || | |
585 | bpem->match_src_port_num || bpem->match_dst_port_num || | |
586 | bpem->match_protocol_num || bpem->match_bitmask) | |
587 | bpem->type = BGP_PBR_IPSET; | |
588 | else if ((bpem->match_bitmask_iprule & PREFIX_SRC_PRESENT) || | |
589 | (bpem->match_bitmask_iprule & PREFIX_DST_PRESENT)) | |
590 | /* the extracted policy rule may not need an | |
591 | * iptables/ipset filtering. check this may not be | |
592 | * a standard ip rule : permit any to any ( eg) | |
593 | */ | |
594 | bpem->type = BGP_PBR_IPRULE; | |
595 | else | |
596 | bpem->type = BGP_PBR_UNDEFINED; | |
47555ee9 | 597 | return error; |
98a9dbc7 | 598 | } |
0378bcaa PG |
599 | |
600 | /* return 1 if FS entry invalid or no NH IP */ | |
3dc339cd DA |
601 | bool bgp_flowspec_get_first_nh(struct bgp *bgp, struct bgp_path_info *pi, |
602 | struct prefix *p) | |
0378bcaa PG |
603 | { |
604 | struct bgp_pbr_entry_main api; | |
605 | int i; | |
606 | struct bgp_node *rn = pi->net; | |
607 | struct bgp_pbr_entry_action *api_action; | |
608 | ||
609 | memset(&api, 0, sizeof(struct bgp_pbr_entry_main)); | |
b54892e0 DS |
610 | if (bgp_pbr_build_and_validate_entry(bgp_node_get_prefix(rn), pi, &api) |
611 | < 0) | |
3dc339cd | 612 | return true; |
0378bcaa PG |
613 | for (i = 0; i < api.action_num; i++) { |
614 | api_action = &api.actions[i]; | |
615 | if (api_action->action != ACTION_REDIRECT_IP) | |
616 | continue; | |
617 | p->family = AF_INET; | |
618 | p->prefixlen = IPV4_MAX_BITLEN; | |
619 | p->u.prefix4 = api_action->u.zr.redirect_ip_v4; | |
3dc339cd | 620 | return false; |
0378bcaa | 621 | } |
3dc339cd | 622 | return true; |
0378bcaa | 623 | } |