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Merge pull request #3030 from pacovn/fp_type_fixes1
[mirror_frr.git] / bgpd / bgp_pbr.c
1 /*
2 * BGP pbr
3 * Copyright (C) 6WIND
4 *
5 * FRR is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2, or (at your option) any
8 * later version.
9 *
10 * FRR is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; see the file COPYING; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 #include "zebra.h"
21 #include "prefix.h"
22 #include "zclient.h"
23 #include "jhash.h"
24 #include "pbr.h"
25
26 #include "bgpd/bgpd.h"
27 #include "bgpd/bgp_pbr.h"
28 #include "bgpd/bgp_debug.h"
29 #include "bgpd/bgp_flowspec_util.h"
30 #include "bgpd/bgp_ecommunity.h"
31 #include "bgpd/bgp_route.h"
32 #include "bgpd/bgp_attr.h"
33 #include "bgpd/bgp_zebra.h"
34 #include "bgpd/bgp_mplsvpn.h"
35 #include "bgpd/bgp_flowspec_private.h"
36 #include "bgpd/bgp_errors.h"
37
38 DEFINE_MTYPE_STATIC(BGPD, PBR_MATCH_ENTRY, "PBR match entry")
39 DEFINE_MTYPE_STATIC(BGPD, PBR_MATCH, "PBR match")
40 DEFINE_MTYPE_STATIC(BGPD, PBR_ACTION, "PBR action")
41 DEFINE_MTYPE_STATIC(BGPD, PBR, "BGP PBR Context")
42 DEFINE_MTYPE_STATIC(BGPD, PBR_VALMASK, "BGP PBR Val Mask Value")
43
44 RB_GENERATE(bgp_pbr_interface_head, bgp_pbr_interface,
45 id_entry, bgp_pbr_interface_compare);
46 struct bgp_pbr_interface_head ifaces_by_name_ipv4 =
47 RB_INITIALIZER(&ifaces_by_name_ipv4);
48
49 static int bgp_pbr_match_counter_unique;
50 static int bgp_pbr_match_entry_counter_unique;
51 static int bgp_pbr_action_counter_unique;
52 static int bgp_pbr_match_iptable_counter_unique;
53
54 struct bgp_pbr_match_iptable_unique {
55 uint32_t unique;
56 struct bgp_pbr_match *bpm_found;
57 };
58
59 struct bgp_pbr_match_entry_unique {
60 uint32_t unique;
61 struct bgp_pbr_match_entry *bpme_found;
62 };
63
64 struct bgp_pbr_action_unique {
65 uint32_t unique;
66 struct bgp_pbr_action *bpa_found;
67 };
68
69 static int bgp_pbr_action_walkcb(struct hash_backet *backet, void *arg)
70 {
71 struct bgp_pbr_action *bpa = (struct bgp_pbr_action *)backet->data;
72 struct bgp_pbr_action_unique *bpau = (struct bgp_pbr_action_unique *)
73 arg;
74 uint32_t unique = bpau->unique;
75
76 if (bpa->unique == unique) {
77 bpau->bpa_found = bpa;
78 return HASHWALK_ABORT;
79 }
80 return HASHWALK_CONTINUE;
81 }
82
83 static int bgp_pbr_match_entry_walkcb(struct hash_backet *backet, void *arg)
84 {
85 struct bgp_pbr_match_entry *bpme =
86 (struct bgp_pbr_match_entry *)backet->data;
87 struct bgp_pbr_match_entry_unique *bpmeu =
88 (struct bgp_pbr_match_entry_unique *)arg;
89 uint32_t unique = bpmeu->unique;
90
91 if (bpme->unique == unique) {
92 bpmeu->bpme_found = bpme;
93 return HASHWALK_ABORT;
94 }
95 return HASHWALK_CONTINUE;
96 }
97
98 struct bgp_pbr_match_ipsetname {
99 char *ipsetname;
100 struct bgp_pbr_match *bpm_found;
101 };
102
103 static int bgp_pbr_match_pername_walkcb(struct hash_backet *backet, void *arg)
104 {
105 struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)backet->data;
106 struct bgp_pbr_match_ipsetname *bpmi =
107 (struct bgp_pbr_match_ipsetname *)arg;
108 char *ipset_name = bpmi->ipsetname;
109
110 if (!strncmp(ipset_name, bpm->ipset_name,
111 ZEBRA_IPSET_NAME_SIZE)) {
112 bpmi->bpm_found = bpm;
113 return HASHWALK_ABORT;
114 }
115 return HASHWALK_CONTINUE;
116 }
117
118 static int bgp_pbr_match_iptable_walkcb(struct hash_backet *backet, void *arg)
119 {
120 struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)backet->data;
121 struct bgp_pbr_match_iptable_unique *bpmiu =
122 (struct bgp_pbr_match_iptable_unique *)arg;
123 uint32_t unique = bpmiu->unique;
124
125 if (bpm->unique2 == unique) {
126 bpmiu->bpm_found = bpm;
127 return HASHWALK_ABORT;
128 }
129 return HASHWALK_CONTINUE;
130 }
131
132 struct bgp_pbr_match_unique {
133 uint32_t unique;
134 struct bgp_pbr_match *bpm_found;
135 };
136
137 static int bgp_pbr_match_walkcb(struct hash_backet *backet, void *arg)
138 {
139 struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)backet->data;
140 struct bgp_pbr_match_unique *bpmu = (struct bgp_pbr_match_unique *)
141 arg;
142 uint32_t unique = bpmu->unique;
143
144 if (bpm->unique == unique) {
145 bpmu->bpm_found = bpm;
146 return HASHWALK_ABORT;
147 }
148 return HASHWALK_CONTINUE;
149 }
150
151 static int sprintf_bgp_pbr_match_val(char *str, struct bgp_pbr_match_val *mval,
152 const char *prepend)
153 {
154 char *ptr = str;
155
156 if (prepend)
157 ptr += sprintf(ptr, "%s", prepend);
158 else {
159 if (mval->unary_operator & OPERATOR_UNARY_OR)
160 ptr += sprintf(ptr, ", or ");
161 if (mval->unary_operator & OPERATOR_UNARY_AND)
162 ptr += sprintf(ptr, ", and ");
163 }
164 if (mval->compare_operator & OPERATOR_COMPARE_LESS_THAN)
165 ptr += sprintf(ptr, "<");
166 if (mval->compare_operator & OPERATOR_COMPARE_GREATER_THAN)
167 ptr += sprintf(ptr, ">");
168 if (mval->compare_operator & OPERATOR_COMPARE_EQUAL_TO)
169 ptr += sprintf(ptr, "=");
170 if (mval->compare_operator & OPERATOR_COMPARE_EXACT_MATCH)
171 ptr += sprintf(ptr, "match");
172 ptr += sprintf(ptr, " %u", mval->value);
173 return (int)(ptr - str);
174 }
175
176 #define INCREMENT_DISPLAY(_ptr, _cnt) do { \
177 if (_cnt) \
178 (_ptr) += sprintf((_ptr), "; "); \
179 _cnt++; \
180 } while (0)
181
182 /* this structure can be used for port range,
183 * but also for other values range like packet length range
184 */
185 struct bgp_pbr_range_port {
186 uint16_t min_port;
187 uint16_t max_port;
188 };
189
190 /* this structure can be used to filter with a mask
191 * for instance it supports not instructions like for
192 * tcpflags
193 */
194 struct bgp_pbr_val_mask {
195 uint16_t val;
196 uint16_t mask;
197 };
198
199 /* this structure is used to pass instructs
200 * so that BGP can create pbr instructions to ZEBRA
201 */
202 struct bgp_pbr_filter {
203 vrf_id_t vrf_id;
204 struct prefix *src;
205 struct prefix *dst;
206 uint8_t protocol;
207 struct bgp_pbr_range_port *pkt_len;
208 struct bgp_pbr_range_port *src_port;
209 struct bgp_pbr_range_port *dst_port;
210 struct bgp_pbr_val_mask *tcp_flags;
211 struct bgp_pbr_val_mask *dscp;
212 struct bgp_pbr_val_mask *pkt_len_val;
213 struct bgp_pbr_val_mask *fragment;
214 };
215
216 /* this structure is used to contain OR instructions
217 * so that BGP can create multiple pbr instructions
218 * to ZEBRA
219 */
220 struct bgp_pbr_or_filter {
221 struct list *tcpflags;
222 struct list *dscp;
223 struct list *pkt_len;
224 struct list *fragment;
225 struct list *icmp_type;
226 struct list *icmp_code;
227 };
228
229 static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
230 struct bgp_info *binfo,
231 struct bgp_pbr_filter *bpf,
232 struct nexthop *nh,
233 float *rate);
234
235 static void bgp_pbr_dump_entry(struct bgp_pbr_filter *bpf, bool add);
236
237 static bool bgp_pbr_extract_enumerate_unary_opposite(
238 uint8_t unary_operator,
239 struct bgp_pbr_val_mask *and_valmask,
240 struct list *or_valmask, uint32_t value,
241 uint8_t type_entry)
242 {
243 if (unary_operator == OPERATOR_UNARY_AND && and_valmask) {
244 if (type_entry == FLOWSPEC_TCP_FLAGS) {
245 and_valmask->mask |=
246 TCP_HEADER_ALL_FLAGS &
247 ~(value);
248 } else if (type_entry == FLOWSPEC_DSCP ||
249 type_entry == FLOWSPEC_PKT_LEN ||
250 type_entry == FLOWSPEC_FRAGMENT) {
251 and_valmask->val = value;
252 and_valmask->mask = 1; /* inverse */
253 }
254 } else if (unary_operator == OPERATOR_UNARY_OR && or_valmask) {
255 and_valmask = XCALLOC(MTYPE_PBR_VALMASK,
256 sizeof(struct bgp_pbr_val_mask));
257 if (type_entry == FLOWSPEC_TCP_FLAGS) {
258 and_valmask->val = TCP_HEADER_ALL_FLAGS;
259 and_valmask->mask |=
260 TCP_HEADER_ALL_FLAGS &
261 ~(value);
262 } else if (type_entry == FLOWSPEC_DSCP ||
263 type_entry == FLOWSPEC_FRAGMENT ||
264 type_entry == FLOWSPEC_PKT_LEN) {
265 and_valmask->val = value;
266 and_valmask->mask = 1; /* inverse */
267 }
268 listnode_add(or_valmask, and_valmask);
269 } else if (type_entry == FLOWSPEC_ICMP_CODE ||
270 type_entry == FLOWSPEC_ICMP_TYPE)
271 return false;
272 return true;
273 }
274
275 /* TCP : FIN and SYN -> val = ALL; mask = 3
276 * TCP : not (FIN and SYN) -> val = ALL; mask = ALL & ~(FIN|RST)
277 * other variables type: dscp, pkt len, fragment
278 * - value is copied in bgp_pbr_val_mask->val value
279 * - if negate form is identifierd, bgp_pbr_val_mask->mask set to 1
280 */
281 static bool bgp_pbr_extract_enumerate_unary(struct bgp_pbr_match_val list[],
282 int num, uint8_t unary_operator,
283 void *valmask, uint8_t type_entry)
284 {
285 int i = 0;
286 struct bgp_pbr_val_mask *and_valmask = NULL;
287 struct list *or_valmask = NULL;
288 bool ret;
289
290 if (valmask) {
291 if (unary_operator == OPERATOR_UNARY_AND) {
292 and_valmask = (struct bgp_pbr_val_mask *)valmask;
293 memset(and_valmask, 0, sizeof(struct bgp_pbr_val_mask));
294 } else if (unary_operator == OPERATOR_UNARY_OR) {
295 or_valmask = (struct list *)valmask;
296 }
297 }
298 for (i = 0; i < num; i++) {
299 if (i != 0 && list[i].unary_operator !=
300 unary_operator)
301 return false;
302 if (!(list[i].compare_operator &
303 OPERATOR_COMPARE_EQUAL_TO) &&
304 !(list[i].compare_operator &
305 OPERATOR_COMPARE_EXACT_MATCH)) {
306 if ((list[i].compare_operator &
307 OPERATOR_COMPARE_LESS_THAN) &&
308 (list[i].compare_operator &
309 OPERATOR_COMPARE_GREATER_THAN)) {
310 ret = bgp_pbr_extract_enumerate_unary_opposite(
311 unary_operator, and_valmask,
312 or_valmask, list[i].value,
313 type_entry);
314 if (ret == false)
315 return ret;
316 continue;
317 }
318 return false;
319 }
320 if (unary_operator == OPERATOR_UNARY_AND && and_valmask) {
321 if (type_entry == FLOWSPEC_TCP_FLAGS)
322 and_valmask->mask |=
323 TCP_HEADER_ALL_FLAGS & list[i].value;
324 } else if (unary_operator == OPERATOR_UNARY_OR && or_valmask) {
325 and_valmask = XCALLOC(MTYPE_PBR_VALMASK,
326 sizeof(struct bgp_pbr_val_mask));
327 if (type_entry == FLOWSPEC_TCP_FLAGS) {
328 and_valmask->val = TCP_HEADER_ALL_FLAGS;
329 and_valmask->mask |=
330 TCP_HEADER_ALL_FLAGS & list[i].value;
331 } else if (type_entry == FLOWSPEC_DSCP ||
332 type_entry == FLOWSPEC_ICMP_TYPE ||
333 type_entry == FLOWSPEC_ICMP_CODE ||
334 type_entry == FLOWSPEC_FRAGMENT ||
335 type_entry == FLOWSPEC_PKT_LEN)
336 and_valmask->val = list[i].value;
337 listnode_add(or_valmask, and_valmask);
338 }
339 }
340 if (unary_operator == OPERATOR_UNARY_AND && and_valmask
341 && type_entry == FLOWSPEC_TCP_FLAGS)
342 and_valmask->val = TCP_HEADER_ALL_FLAGS;
343 return true;
344 }
345
346 /* if unary operator can either be UNARY_OR/AND/OR-AND.
347 * in the latter case, combinationf of both is not handled
348 */
349 static bool bgp_pbr_extract_enumerate(struct bgp_pbr_match_val list[],
350 int num, uint8_t unary_operator,
351 void *valmask, uint8_t type_entry)
352 {
353 bool ret;
354 uint8_t unary_operator_val;
355 bool double_check = false;
356
357 if ((unary_operator & OPERATOR_UNARY_OR) &&
358 (unary_operator & OPERATOR_UNARY_AND)) {
359 unary_operator_val = OPERATOR_UNARY_AND;
360 double_check = true;
361 } else
362 unary_operator_val = unary_operator;
363 ret = bgp_pbr_extract_enumerate_unary(list, num, unary_operator_val,
364 valmask, type_entry);
365 if (!ret && double_check)
366 ret = bgp_pbr_extract_enumerate_unary(list, num,
367 OPERATOR_UNARY_OR,
368 valmask,
369 type_entry);
370 return ret;
371 }
372
373 /* returns the unary operator that is in the list
374 * return 0 if both operators are used
375 */
376 static uint8_t bgp_pbr_match_val_get_operator(struct bgp_pbr_match_val list[],
377 int num)
378
379 {
380 int i;
381 uint8_t unary_operator = OPERATOR_UNARY_AND;
382
383 for (i = 0; i < num; i++) {
384 if (i == 0)
385 continue;
386 if (list[i].unary_operator & OPERATOR_UNARY_OR)
387 unary_operator = OPERATOR_UNARY_OR;
388 if ((list[i].unary_operator & OPERATOR_UNARY_AND
389 && unary_operator == OPERATOR_UNARY_OR) ||
390 (list[i].unary_operator & OPERATOR_UNARY_OR
391 && unary_operator == OPERATOR_UNARY_AND))
392 return 0;
393 }
394 return unary_operator;
395 }
396
397
398 /* return true if extraction ok
399 */
400 static bool bgp_pbr_extract(struct bgp_pbr_match_val list[],
401 int num,
402 struct bgp_pbr_range_port *range)
403 {
404 int i = 0;
405 bool exact_match = false;
406
407 if (range)
408 memset(range, 0, sizeof(struct bgp_pbr_range_port));
409
410 if (num > 2)
411 return false;
412 for (i = 0; i < num; i++) {
413 if (i != 0 && (list[i].compare_operator ==
414 OPERATOR_COMPARE_EQUAL_TO))
415 return false;
416 if (i == 0 && (list[i].compare_operator ==
417 OPERATOR_COMPARE_EQUAL_TO)) {
418 if (range)
419 range->min_port = list[i].value;
420 exact_match = true;
421 }
422 if (exact_match == true && i > 0)
423 return false;
424 if (list[i].compare_operator ==
425 (OPERATOR_COMPARE_GREATER_THAN +
426 OPERATOR_COMPARE_EQUAL_TO)) {
427 if (range)
428 range->min_port = list[i].value;
429 } else if (list[i].compare_operator ==
430 (OPERATOR_COMPARE_LESS_THAN +
431 OPERATOR_COMPARE_EQUAL_TO)) {
432 if (range)
433 range->max_port = list[i].value;
434 } else if (list[i].compare_operator ==
435 OPERATOR_COMPARE_LESS_THAN) {
436 if (range)
437 range->max_port = list[i].value - 1;
438 } else if (list[i].compare_operator ==
439 OPERATOR_COMPARE_GREATER_THAN) {
440 if (range)
441 range->min_port = list[i].value + 1;
442 }
443 }
444 return true;
445 }
446
447 static int bgp_pbr_validate_policy_route(struct bgp_pbr_entry_main *api)
448 {
449 bool enumerate_icmp = false;
450
451 /* because bgp pbr entry may contain unsupported
452 * combinations, a message will be displayed here if
453 * not supported.
454 * for now, only match/set supported is
455 * - combination src/dst => redirect nexthop [ + rate]
456 * - combination src/dst => redirect VRF [ + rate]
457 * - combination src/dst => drop
458 * - combination srcport + @IP
459 */
460 if (api->match_protocol_num > 1) {
461 if (BGP_DEBUG(pbr, PBR))
462 zlog_debug("BGP: match protocol operations:"
463 "multiple protocols ( %d). ignoring.",
464 api->match_protocol_num);
465 return 0;
466 }
467 if (api->match_protocol_num == 1 &&
468 api->protocol[0].value != PROTOCOL_UDP &&
469 api->protocol[0].value != PROTOCOL_ICMP &&
470 api->protocol[0].value != PROTOCOL_TCP) {
471 if (BGP_DEBUG(pbr, PBR))
472 zlog_debug("BGP: match protocol operations:"
473 "protocol (%d) not supported. ignoring",
474 api->match_protocol_num);
475 return 0;
476 }
477 if (!bgp_pbr_extract(api->src_port, api->match_src_port_num, NULL)) {
478 if (BGP_DEBUG(pbr, PBR))
479 zlog_debug("BGP: match src port operations:"
480 "too complex. ignoring.");
481 return 0;
482 }
483 if (!bgp_pbr_extract(api->dst_port, api->match_dst_port_num, NULL)) {
484 if (BGP_DEBUG(pbr, PBR))
485 zlog_debug("BGP: match dst port operations:"
486 "too complex. ignoring.");
487 return 0;
488 }
489 if (!bgp_pbr_extract_enumerate(api->tcpflags,
490 api->match_tcpflags_num,
491 OPERATOR_UNARY_AND |
492 OPERATOR_UNARY_OR, NULL,
493 FLOWSPEC_TCP_FLAGS)) {
494 if (BGP_DEBUG(pbr, PBR))
495 zlog_debug("BGP: match tcp flags:"
496 "too complex. ignoring.");
497 return 0;
498 }
499 if (!bgp_pbr_extract(api->icmp_type, api->match_icmp_type_num, NULL)) {
500 if (!bgp_pbr_extract_enumerate(api->icmp_type,
501 api->match_icmp_type_num,
502 OPERATOR_UNARY_OR, NULL,
503 FLOWSPEC_ICMP_TYPE)) {
504 if (BGP_DEBUG(pbr, PBR))
505 zlog_debug("BGP: match icmp type operations:"
506 "too complex. ignoring.");
507 return 0;
508 }
509 enumerate_icmp = true;
510 }
511 if (!bgp_pbr_extract(api->icmp_code, api->match_icmp_code_num, NULL)) {
512 if (!bgp_pbr_extract_enumerate(api->icmp_code,
513 api->match_icmp_code_num,
514 OPERATOR_UNARY_OR, NULL,
515 FLOWSPEC_ICMP_CODE)) {
516 if (BGP_DEBUG(pbr, PBR))
517 zlog_debug("BGP: match icmp code operations:"
518 "too complex. ignoring.");
519 return 0;
520 } else if (api->match_icmp_type_num > 1 &&
521 enumerate_icmp == false) {
522 if (BGP_DEBUG(pbr, PBR))
523 zlog_debug("BGP: match icmp code is enumerate"
524 ", and icmp type is not."
525 " too complex. ignoring.");
526 return 0;
527 }
528 }
529 if (!bgp_pbr_extract(api->port, api->match_port_num, NULL)) {
530 if (BGP_DEBUG(pbr, PBR))
531 zlog_debug("BGP: match port operations:"
532 "too complex. ignoring.");
533 return 0;
534 }
535 if (api->match_packet_length_num) {
536 bool ret;
537
538 ret = bgp_pbr_extract(api->packet_length,
539 api->match_packet_length_num, NULL);
540 if (!ret)
541 ret = bgp_pbr_extract_enumerate(api->packet_length,
542 api->match_packet_length_num,
543 OPERATOR_UNARY_OR
544 | OPERATOR_UNARY_AND,
545 NULL, FLOWSPEC_PKT_LEN);
546 if (!ret) {
547 if (BGP_DEBUG(pbr, PBR))
548 zlog_debug("BGP: match packet length operations:"
549 "too complex. ignoring.");
550 return 0;
551 }
552 }
553 if (api->match_dscp_num) {
554 if (!bgp_pbr_extract_enumerate(api->dscp, api->match_dscp_num,
555 OPERATOR_UNARY_OR | OPERATOR_UNARY_AND,
556 NULL, FLOWSPEC_DSCP)) {
557 if (BGP_DEBUG(pbr, PBR))
558 zlog_debug("BGP: match DSCP operations:"
559 "too complex. ignoring.");
560 return 0;
561 }
562 }
563 if (api->match_fragment_num) {
564 char fail_str[64];
565 bool success;
566
567 success = bgp_pbr_extract_enumerate(api->fragment,
568 api->match_fragment_num,
569 OPERATOR_UNARY_OR
570 | OPERATOR_UNARY_AND,
571 NULL, FLOWSPEC_FRAGMENT);
572 if (success) {
573 int i;
574
575 for (i = 0; i < api->match_fragment_num; i++) {
576 if (api->fragment[i].value != 1 &&
577 api->fragment[i].value != 2 &&
578 api->fragment[i].value != 4 &&
579 api->fragment[i].value != 8) {
580 success = false;
581 sprintf(fail_str,
582 "Value not valid (%d) for this implementation",
583 api->fragment[i].value);
584 }
585 }
586 } else
587 sprintf(fail_str, "too complex. ignoring");
588 if (!success) {
589 if (BGP_DEBUG(pbr, PBR))
590 zlog_debug("BGP: match fragment operation (%d) %s",
591 api->match_fragment_num,
592 fail_str);
593 return 0;
594 }
595 }
596
597 /* no combinations with both src_port and dst_port
598 * or port with src_port and dst_port
599 */
600 if (api->match_src_port_num + api->match_dst_port_num +
601 api->match_port_num > 3) {
602 if (BGP_DEBUG(pbr, PBR))
603 zlog_debug("BGP: match multiple port operations:"
604 " too complex. ignoring.");
605 return 0;
606 }
607 if ((api->match_src_port_num || api->match_dst_port_num
608 || api->match_port_num) && (api->match_icmp_type_num
609 || api->match_icmp_code_num)) {
610 if (BGP_DEBUG(pbr, PBR))
611 zlog_debug("BGP: match multiple port/imcp operations:"
612 " too complex. ignoring.");
613 return 0;
614 }
615 if (!(api->match_bitmask & PREFIX_SRC_PRESENT) &&
616 !(api->match_bitmask & PREFIX_DST_PRESENT)) {
617 if (BGP_DEBUG(pbr, PBR)) {
618 bgp_pbr_print_policy_route(api);
619 zlog_debug("BGP: match actions without src"
620 " or dst address can not operate."
621 " ignoring.");
622 }
623 return 0;
624 }
625 return 1;
626 }
627
628 /* return -1 if build or validation failed */
629 static int bgp_pbr_build_and_validate_entry(struct prefix *p,
630 struct bgp_info *info,
631 struct bgp_pbr_entry_main *api)
632 {
633 int ret;
634 int i, action_count = 0;
635 struct ecommunity *ecom;
636 struct ecommunity_val *ecom_eval;
637 struct bgp_pbr_entry_action *api_action;
638 struct prefix *src = NULL, *dst = NULL;
639 int valid_prefix = 0;
640 afi_t afi = AFI_IP;
641
642 /* extract match from flowspec entries */
643 ret = bgp_flowspec_match_rules_fill((uint8_t *)p->u.prefix_flowspec.ptr,
644 p->u.prefix_flowspec.prefixlen, api);
645 if (ret < 0)
646 return -1;
647 /* extract actiosn from flowspec ecom list */
648 if (info && info->attr && info->attr->ecommunity) {
649 ecom = info->attr->ecommunity;
650 for (i = 0; i < ecom->size; i++) {
651 ecom_eval = (struct ecommunity_val *)
652 (ecom->val + (i * ECOMMUNITY_SIZE));
653 action_count++;
654 if (action_count > ACTIONS_MAX_NUM) {
655 if (BGP_DEBUG(pbr, PBR_ERROR))
656 flog_err(
657 EC_BGP_FLOWSPEC_PACKET,
658 "%s: flowspec actions exceeds limit (max %u)",
659 __func__, action_count);
660 break;
661 }
662 api_action = &api->actions[action_count - 1];
663
664 if ((ecom_eval->val[1] ==
665 (char)ECOMMUNITY_REDIRECT_VRF) &&
666 (ecom_eval->val[0] ==
667 (char)ECOMMUNITY_ENCODE_TRANS_EXP ||
668 ecom_eval->val[0] ==
669 (char)ECOMMUNITY_EXTENDED_COMMUNITY_PART_2 ||
670 ecom_eval->val[0] ==
671 (char)ECOMMUNITY_EXTENDED_COMMUNITY_PART_3)) {
672 struct ecommunity *eckey = ecommunity_new();
673 struct ecommunity_val ecom_copy;
674
675 memcpy(&ecom_copy, ecom_eval,
676 sizeof(struct ecommunity_val));
677 ecom_copy.val[0] &=
678 ~ECOMMUNITY_ENCODE_TRANS_EXP;
679 ecom_copy.val[1] = ECOMMUNITY_ROUTE_TARGET;
680 ecommunity_add_val(eckey, &ecom_copy);
681
682 api_action->action = ACTION_REDIRECT;
683 api_action->u.redirect_vrf =
684 get_first_vrf_for_redirect_with_rt(
685 eckey);
686 ecommunity_free(&eckey);
687 } else if ((ecom_eval->val[0] ==
688 (char)ECOMMUNITY_ENCODE_REDIRECT_IP_NH) &&
689 (ecom_eval->val[1] ==
690 (char)ECOMMUNITY_REDIRECT_IP_NH)) {
691 api_action->action = ACTION_REDIRECT_IP;
692 api_action->u.zr.redirect_ip_v4.s_addr =
693 info->attr->nexthop.s_addr;
694 api_action->u.zr.duplicate = ecom_eval->val[7];
695 } else {
696 if (ecom_eval->val[0] !=
697 (char)ECOMMUNITY_ENCODE_TRANS_EXP)
698 continue;
699 ret = ecommunity_fill_pbr_action(ecom_eval,
700 api_action);
701 if (ret != 0)
702 continue;
703 }
704 api->action_num++;
705 }
706 }
707
708 /* validate if incoming matc/action is compatible
709 * with our policy routing engine
710 */
711 if (!bgp_pbr_validate_policy_route(api))
712 return -1;
713
714 /* check inconsistency in the match rule */
715 if (api->match_bitmask & PREFIX_SRC_PRESENT) {
716 src = &api->src_prefix;
717 afi = family2afi(src->family);
718 valid_prefix = 1;
719 }
720 if (api->match_bitmask & PREFIX_DST_PRESENT) {
721 dst = &api->dst_prefix;
722 if (valid_prefix && afi != family2afi(dst->family)) {
723 if (BGP_DEBUG(pbr, PBR)) {
724 bgp_pbr_print_policy_route(api);
725 zlog_debug("%s: inconsistency:"
726 " no match for afi src and dst (%u/%u)",
727 __func__, afi, family2afi(dst->family));
728 }
729 return -1;
730 }
731 }
732 return 0;
733 }
734
735 static void bgp_pbr_match_entry_free(void *arg)
736 {
737 struct bgp_pbr_match_entry *bpme;
738
739 bpme = (struct bgp_pbr_match_entry *)arg;
740
741 if (bpme->installed) {
742 bgp_send_pbr_ipset_entry_match(bpme, false);
743 bpme->installed = false;
744 bpme->backpointer = NULL;
745 }
746 XFREE(MTYPE_PBR_MATCH_ENTRY, bpme);
747 }
748
749 static void bgp_pbr_match_free(void *arg)
750 {
751 struct bgp_pbr_match *bpm;
752
753 bpm = (struct bgp_pbr_match *)arg;
754
755 hash_clean(bpm->entry_hash, bgp_pbr_match_entry_free);
756
757 if (hashcount(bpm->entry_hash) == 0) {
758 /* delete iptable entry first */
759 /* then delete ipset match */
760 if (bpm->installed) {
761 if (bpm->installed_in_iptable) {
762 bgp_send_pbr_iptable(bpm->action,
763 bpm, false);
764 bpm->installed_in_iptable = false;
765 bpm->action->refcnt--;
766 }
767 bgp_send_pbr_ipset_match(bpm, false);
768 bpm->installed = false;
769 bpm->action = NULL;
770 }
771 }
772 hash_free(bpm->entry_hash);
773
774 XFREE(MTYPE_PBR_MATCH, bpm);
775 }
776
777 static void *bgp_pbr_match_alloc_intern(void *arg)
778 {
779 struct bgp_pbr_match *bpm, *new;
780
781 bpm = (struct bgp_pbr_match *)arg;
782
783 new = XCALLOC(MTYPE_PBR_MATCH, sizeof(*new));
784 memcpy(new, bpm, sizeof(*bpm));
785
786 return new;
787 }
788
789 static void bgp_pbr_action_free(void *arg)
790 {
791 struct bgp_pbr_action *bpa;
792
793 bpa = (struct bgp_pbr_action *)arg;
794
795 if (bpa->refcnt == 0) {
796 if (bpa->installed && bpa->table_id != 0) {
797 bgp_send_pbr_rule_action(bpa, false);
798 bgp_zebra_announce_default(bpa->bgp, &(bpa->nh),
799 AFI_IP,
800 bpa->table_id,
801 false);
802 bpa->installed = false;
803 }
804 }
805 XFREE(MTYPE_PBR_ACTION, bpa);
806 }
807
808 static void *bgp_pbr_action_alloc_intern(void *arg)
809 {
810 struct bgp_pbr_action *bpa, *new;
811
812 bpa = (struct bgp_pbr_action *)arg;
813
814 new = XCALLOC(MTYPE_PBR_ACTION, sizeof(*new));
815
816 memcpy(new, bpa, sizeof(*bpa));
817
818 return new;
819 }
820
821 static void *bgp_pbr_match_entry_alloc_intern(void *arg)
822 {
823 struct bgp_pbr_match_entry *bpme, *new;
824
825 bpme = (struct bgp_pbr_match_entry *)arg;
826
827 new = XCALLOC(MTYPE_PBR_MATCH_ENTRY, sizeof(*new));
828
829 memcpy(new, bpme, sizeof(*bpme));
830
831 return new;
832 }
833
834 uint32_t bgp_pbr_match_hash_key(void *arg)
835 {
836 struct bgp_pbr_match *pbm = (struct bgp_pbr_match *)arg;
837 uint32_t key;
838
839 key = jhash_1word(pbm->vrf_id, 0x4312abde);
840 key = jhash_1word(pbm->flags, key);
841 key = jhash(&pbm->pkt_len_min, 2, key);
842 key = jhash(&pbm->pkt_len_max, 2, key);
843 key = jhash(&pbm->tcp_flags, 2, key);
844 key = jhash(&pbm->tcp_mask_flags, 2, key);
845 key = jhash(&pbm->dscp_value, 1, key);
846 key = jhash(&pbm->fragment, 1, key);
847 return jhash_1word(pbm->type, key);
848 }
849
850 int bgp_pbr_match_hash_equal(const void *arg1, const void *arg2)
851 {
852 const struct bgp_pbr_match *r1, *r2;
853
854 r1 = (const struct bgp_pbr_match *)arg1;
855 r2 = (const struct bgp_pbr_match *)arg2;
856
857 if (r1->vrf_id != r2->vrf_id)
858 return 0;
859
860 if (r1->type != r2->type)
861 return 0;
862
863 if (r1->flags != r2->flags)
864 return 0;
865
866 if (r1->action != r2->action)
867 return 0;
868
869 if (r1->pkt_len_min != r2->pkt_len_min)
870 return 0;
871
872 if (r1->pkt_len_max != r2->pkt_len_max)
873 return 0;
874
875 if (r1->tcp_flags != r2->tcp_flags)
876 return 0;
877
878 if (r1->tcp_mask_flags != r2->tcp_mask_flags)
879 return 0;
880
881 if (r1->dscp_value != r2->dscp_value)
882 return 0;
883
884 if (r1->fragment != r2->fragment)
885 return 0;
886 return 1;
887 }
888
889 uint32_t bgp_pbr_match_entry_hash_key(void *arg)
890 {
891 struct bgp_pbr_match_entry *pbme;
892 uint32_t key;
893
894 pbme = (struct bgp_pbr_match_entry *)arg;
895 key = prefix_hash_key(&pbme->src);
896 key = jhash_1word(prefix_hash_key(&pbme->dst), key);
897 key = jhash(&pbme->dst_port_min, 2, key);
898 key = jhash(&pbme->src_port_min, 2, key);
899 key = jhash(&pbme->dst_port_max, 2, key);
900 key = jhash(&pbme->src_port_max, 2, key);
901 key = jhash(&pbme->proto, 1, key);
902
903 return key;
904 }
905
906 int bgp_pbr_match_entry_hash_equal(const void *arg1, const void *arg2)
907 {
908 const struct bgp_pbr_match_entry *r1, *r2;
909
910 r1 = (const struct bgp_pbr_match_entry *)arg1;
911 r2 = (const struct bgp_pbr_match_entry *)arg2;
912
913 /* on updates, comparing
914 * backpointer is not necessary
915 */
916
917 /* unique value is self calculated
918 */
919
920 /* rate is ignored for now
921 */
922
923 if (!prefix_same(&r1->src, &r2->src))
924 return 0;
925
926 if (!prefix_same(&r1->dst, &r2->dst))
927 return 0;
928
929 if (r1->src_port_min != r2->src_port_min)
930 return 0;
931
932 if (r1->dst_port_min != r2->dst_port_min)
933 return 0;
934
935 if (r1->src_port_max != r2->src_port_max)
936 return 0;
937
938 if (r1->dst_port_max != r2->dst_port_max)
939 return 0;
940
941 if (r1->proto != r2->proto)
942 return 0;
943
944 return 1;
945 }
946
947 uint32_t bgp_pbr_action_hash_key(void *arg)
948 {
949 struct bgp_pbr_action *pbra;
950 uint32_t key;
951
952 pbra = (struct bgp_pbr_action *)arg;
953 key = jhash_1word(pbra->table_id, 0x4312abde);
954 key = jhash_1word(pbra->fwmark, key);
955 return key;
956 }
957
958 int bgp_pbr_action_hash_equal(const void *arg1, const void *arg2)
959 {
960 const struct bgp_pbr_action *r1, *r2;
961
962 r1 = (const struct bgp_pbr_action *)arg1;
963 r2 = (const struct bgp_pbr_action *)arg2;
964
965 /* unique value is self calculated
966 * table and fwmark is self calculated
967 * rate is ignored
968 */
969 if (r1->vrf_id != r2->vrf_id)
970 return 0;
971
972 if (memcmp(&r1->nh, &r2->nh, sizeof(struct nexthop)))
973 return 0;
974 return 1;
975 }
976
977 struct bgp_pbr_action *bgp_pbr_action_rule_lookup(vrf_id_t vrf_id,
978 uint32_t unique)
979 {
980 struct bgp *bgp = bgp_lookup_by_vrf_id(vrf_id);
981 struct bgp_pbr_action_unique bpau;
982
983 if (!bgp || unique == 0)
984 return NULL;
985 bpau.unique = unique;
986 bpau.bpa_found = NULL;
987 hash_walk(bgp->pbr_action_hash, bgp_pbr_action_walkcb, &bpau);
988 return bpau.bpa_found;
989 }
990
991 struct bgp_pbr_match *bgp_pbr_match_ipset_lookup(vrf_id_t vrf_id,
992 uint32_t unique)
993 {
994 struct bgp *bgp = bgp_lookup_by_vrf_id(vrf_id);
995 struct bgp_pbr_match_unique bpmu;
996
997 if (!bgp || unique == 0)
998 return NULL;
999 bpmu.unique = unique;
1000 bpmu.bpm_found = NULL;
1001 hash_walk(bgp->pbr_match_hash, bgp_pbr_match_walkcb, &bpmu);
1002 return bpmu.bpm_found;
1003 }
1004
1005 struct bgp_pbr_match_entry *bgp_pbr_match_ipset_entry_lookup(vrf_id_t vrf_id,
1006 char *ipset_name,
1007 uint32_t unique)
1008 {
1009 struct bgp *bgp = bgp_lookup_by_vrf_id(vrf_id);
1010 struct bgp_pbr_match_entry_unique bpmeu;
1011 struct bgp_pbr_match_ipsetname bpmi;
1012
1013 if (!bgp || unique == 0)
1014 return NULL;
1015 bpmi.ipsetname = XCALLOC(MTYPE_TMP, ZEBRA_IPSET_NAME_SIZE);
1016 snprintf(bpmi.ipsetname, ZEBRA_IPSET_NAME_SIZE, "%s", ipset_name);
1017 bpmi.bpm_found = NULL;
1018 hash_walk(bgp->pbr_match_hash, bgp_pbr_match_pername_walkcb, &bpmi);
1019 XFREE(MTYPE_TMP, bpmi.ipsetname);
1020 if (!bpmi.bpm_found)
1021 return NULL;
1022 bpmeu.bpme_found = NULL;
1023 bpmeu.unique = unique;
1024 hash_walk(bpmi.bpm_found->entry_hash,
1025 bgp_pbr_match_entry_walkcb, &bpmeu);
1026 return bpmeu.bpme_found;
1027 }
1028
1029 struct bgp_pbr_match *bgp_pbr_match_iptable_lookup(vrf_id_t vrf_id,
1030 uint32_t unique)
1031 {
1032 struct bgp *bgp = bgp_lookup_by_vrf_id(vrf_id);
1033 struct bgp_pbr_match_iptable_unique bpmiu;
1034
1035 if (!bgp || unique == 0)
1036 return NULL;
1037 bpmiu.unique = unique;
1038 bpmiu.bpm_found = NULL;
1039 hash_walk(bgp->pbr_match_hash, bgp_pbr_match_iptable_walkcb, &bpmiu);
1040 return bpmiu.bpm_found;
1041 }
1042
1043 void bgp_pbr_cleanup(struct bgp *bgp)
1044 {
1045 if (bgp->pbr_match_hash) {
1046 hash_clean(bgp->pbr_match_hash, bgp_pbr_match_free);
1047 hash_free(bgp->pbr_match_hash);
1048 bgp->pbr_match_hash = NULL;
1049 }
1050 if (bgp->pbr_action_hash) {
1051 hash_clean(bgp->pbr_action_hash, bgp_pbr_action_free);
1052 hash_free(bgp->pbr_action_hash);
1053 bgp->pbr_action_hash = NULL;
1054 }
1055 if (bgp->bgp_pbr_cfg == NULL)
1056 return;
1057 bgp_pbr_reset(bgp, AFI_IP);
1058 XFREE(MTYPE_PBR, bgp->bgp_pbr_cfg);
1059 bgp->bgp_pbr_cfg = NULL;
1060 }
1061
1062 void bgp_pbr_init(struct bgp *bgp)
1063 {
1064 bgp->pbr_match_hash =
1065 hash_create_size(8, bgp_pbr_match_hash_key,
1066 bgp_pbr_match_hash_equal,
1067 "Match Hash");
1068 bgp->pbr_action_hash =
1069 hash_create_size(8, bgp_pbr_action_hash_key,
1070 bgp_pbr_action_hash_equal,
1071 "Match Hash Entry");
1072
1073 bgp->bgp_pbr_cfg = XCALLOC(MTYPE_PBR, sizeof(struct bgp_pbr_config));
1074 bgp->bgp_pbr_cfg->pbr_interface_any_ipv4 = true;
1075 }
1076
1077 void bgp_pbr_print_policy_route(struct bgp_pbr_entry_main *api)
1078 {
1079 int i = 0;
1080 char return_string[512];
1081 char *ptr = return_string;
1082 char buff[64];
1083 int nb_items = 0;
1084
1085 ptr += sprintf(ptr, "MATCH : ");
1086 if (api->match_bitmask & PREFIX_SRC_PRESENT) {
1087 struct prefix *p = &(api->src_prefix);
1088
1089 ptr += sprintf(ptr, "@src %s", prefix2str(p, buff, 64));
1090 INCREMENT_DISPLAY(ptr, nb_items);
1091 }
1092 if (api->match_bitmask & PREFIX_DST_PRESENT) {
1093 struct prefix *p = &(api->dst_prefix);
1094
1095 INCREMENT_DISPLAY(ptr, nb_items);
1096 ptr += sprintf(ptr, "@dst %s", prefix2str(p, buff, 64));
1097 }
1098
1099 if (api->match_protocol_num)
1100 INCREMENT_DISPLAY(ptr, nb_items);
1101 for (i = 0; i < api->match_protocol_num; i++)
1102 ptr += sprintf_bgp_pbr_match_val(ptr, &api->protocol[i],
1103 i > 0 ? NULL : "@proto ");
1104
1105 if (api->match_src_port_num)
1106 INCREMENT_DISPLAY(ptr, nb_items);
1107 for (i = 0; i < api->match_src_port_num; i++)
1108 ptr += sprintf_bgp_pbr_match_val(ptr, &api->src_port[i],
1109 i > 0 ? NULL : "@srcport ");
1110
1111 if (api->match_dst_port_num)
1112 INCREMENT_DISPLAY(ptr, nb_items);
1113 for (i = 0; i < api->match_dst_port_num; i++)
1114 ptr += sprintf_bgp_pbr_match_val(ptr, &api->dst_port[i],
1115 i > 0 ? NULL : "@dstport ");
1116
1117 if (api->match_port_num)
1118 INCREMENT_DISPLAY(ptr, nb_items);
1119 for (i = 0; i < api->match_port_num; i++)
1120 ptr += sprintf_bgp_pbr_match_val(ptr, &api->port[i],
1121 i > 0 ? NULL : "@port ");
1122
1123 if (api->match_icmp_type_num)
1124 INCREMENT_DISPLAY(ptr, nb_items);
1125 for (i = 0; i < api->match_icmp_type_num; i++)
1126 ptr += sprintf_bgp_pbr_match_val(ptr, &api->icmp_type[i],
1127 i > 0 ? NULL : "@icmptype ");
1128
1129 if (api->match_icmp_code_num)
1130 INCREMENT_DISPLAY(ptr, nb_items);
1131 for (i = 0; i < api->match_icmp_code_num; i++)
1132 ptr += sprintf_bgp_pbr_match_val(ptr, &api->icmp_code[i],
1133 i > 0 ? NULL : "@icmpcode ");
1134
1135 if (api->match_packet_length_num)
1136 INCREMENT_DISPLAY(ptr, nb_items);
1137 for (i = 0; i < api->match_packet_length_num; i++)
1138 ptr += sprintf_bgp_pbr_match_val(ptr, &api->packet_length[i],
1139 i > 0 ? NULL : "@plen ");
1140
1141 if (api->match_dscp_num)
1142 INCREMENT_DISPLAY(ptr, nb_items);
1143 for (i = 0; i < api->match_dscp_num; i++)
1144 ptr += sprintf_bgp_pbr_match_val(ptr, &api->dscp[i],
1145 i > 0 ? NULL : "@dscp ");
1146
1147 if (api->match_tcpflags_num)
1148 INCREMENT_DISPLAY(ptr, nb_items);
1149 for (i = 0; i < api->match_tcpflags_num; i++)
1150 ptr += sprintf_bgp_pbr_match_val(ptr, &api->tcpflags[i],
1151 i > 0 ? NULL : "@tcpflags ");
1152
1153 if (api->match_fragment_num)
1154 INCREMENT_DISPLAY(ptr, nb_items);
1155 for (i = 0; i < api->match_fragment_num; i++)
1156 ptr += sprintf_bgp_pbr_match_val(ptr, &api->fragment[i],
1157 i > 0 ? NULL : "@fragment ");
1158 if (!nb_items)
1159 ptr = return_string;
1160 else
1161 ptr += sprintf(ptr, "; ");
1162 if (api->action_num)
1163 ptr += sprintf(ptr, "SET : ");
1164 nb_items = 0;
1165 for (i = 0; i < api->action_num; i++) {
1166 switch (api->actions[i].action) {
1167 case ACTION_TRAFFICRATE:
1168 INCREMENT_DISPLAY(ptr, nb_items);
1169 ptr += sprintf(ptr, "@set rate %f",
1170 api->actions[i].u.r.rate);
1171 break;
1172 case ACTION_TRAFFIC_ACTION:
1173 INCREMENT_DISPLAY(ptr, nb_items);
1174 ptr += sprintf(ptr, "@action ");
1175 if (api->actions[i].u.za.filter
1176 & TRAFFIC_ACTION_TERMINATE)
1177 ptr += sprintf(ptr,
1178 " terminate (apply filter(s))");
1179 if (api->actions[i].u.za.filter
1180 & TRAFFIC_ACTION_DISTRIBUTE)
1181 ptr += sprintf(ptr, " distribute");
1182 if (api->actions[i].u.za.filter
1183 & TRAFFIC_ACTION_SAMPLE)
1184 ptr += sprintf(ptr, " sample");
1185 break;
1186 case ACTION_REDIRECT_IP:
1187 INCREMENT_DISPLAY(ptr, nb_items);
1188 char local_buff[INET_ADDRSTRLEN];
1189
1190 if (inet_ntop(AF_INET,
1191 &api->actions[i].u.zr.redirect_ip_v4,
1192 local_buff, INET_ADDRSTRLEN) != NULL)
1193 ptr += sprintf(ptr,
1194 "@redirect ip nh %s", local_buff);
1195 break;
1196 case ACTION_REDIRECT:
1197 INCREMENT_DISPLAY(ptr, nb_items);
1198 ptr += sprintf(ptr, "@redirect vrf %u",
1199 api->actions[i].u.redirect_vrf);
1200 break;
1201 case ACTION_MARKING:
1202 INCREMENT_DISPLAY(ptr, nb_items);
1203 ptr += sprintf(ptr, "@set dscp %u",
1204 api->actions[i].u.marking_dscp);
1205 break;
1206 default:
1207 break;
1208 }
1209 }
1210 zlog_info("%s", return_string);
1211 }
1212
1213 static void bgp_pbr_flush_entry(struct bgp *bgp, struct bgp_pbr_action *bpa,
1214 struct bgp_pbr_match *bpm,
1215 struct bgp_pbr_match_entry *bpme)
1216 {
1217 /* if bpme is null, bpm is also null
1218 */
1219 if (bpme == NULL)
1220 return;
1221 /* ipset del entry */
1222 if (bpme->installed) {
1223 bgp_send_pbr_ipset_entry_match(bpme, false);
1224 bpme->installed = false;
1225 bpme->backpointer = NULL;
1226 if (bpme->bgp_info) {
1227 struct bgp_info *bgp_info;
1228 struct bgp_info_extra *extra;
1229
1230 /* unlink bgp_info to bpme */
1231 bgp_info = (struct bgp_info *)bpme->bgp_info;
1232 extra = bgp_info_extra_get(bgp_info);
1233 if (extra->bgp_fs_pbr)
1234 listnode_delete(extra->bgp_fs_pbr, bpme);
1235 bpme->bgp_info = NULL;
1236 }
1237 }
1238 hash_release(bpm->entry_hash, bpme);
1239 if (hashcount(bpm->entry_hash) == 0) {
1240 /* delete iptable entry first */
1241 /* then delete ipset match */
1242 if (bpm->installed) {
1243 if (bpm->installed_in_iptable) {
1244 bgp_send_pbr_iptable(bpm->action,
1245 bpm, false);
1246 bpm->installed_in_iptable = false;
1247 bpm->action->refcnt--;
1248 }
1249 bgp_send_pbr_ipset_match(bpm, false);
1250 bpm->installed = false;
1251 bpm->action = NULL;
1252 }
1253 hash_release(bgp->pbr_match_hash, bpm);
1254 /* XXX release pbr_match_action if not used
1255 * note that drop does not need to call send_pbr_action
1256 */
1257 }
1258 if (bpa->refcnt == 0) {
1259 if (bpa->installed && bpa->table_id != 0) {
1260 bgp_send_pbr_rule_action(bpa, false);
1261 bgp_zebra_announce_default(bpa->bgp, &(bpa->nh),
1262 AFI_IP,
1263 bpa->table_id,
1264 false);
1265 bpa->installed = false;
1266 }
1267 }
1268 }
1269
1270 struct bgp_pbr_match_entry_remain {
1271 struct bgp_pbr_match_entry *bpme_to_match;
1272 struct bgp_pbr_match_entry *bpme_found;
1273 };
1274
1275 static int bgp_pbr_get_remaining_entry(struct hash_backet *backet, void *arg)
1276 {
1277 struct bgp_pbr_match *bpm = (struct bgp_pbr_match *)backet->data;
1278 struct bgp_pbr_match_entry_remain *bpmer =
1279 (struct bgp_pbr_match_entry_remain *)arg;
1280 struct bgp_pbr_match *bpm_temp;
1281 struct bgp_pbr_match_entry *bpme = bpmer->bpme_to_match;
1282
1283 if (!bpme->backpointer ||
1284 bpm == bpme->backpointer ||
1285 bpme->backpointer->action == bpm->action)
1286 return HASHWALK_CONTINUE;
1287 /* ensure bpm other characteristics are equal */
1288 bpm_temp = bpme->backpointer;
1289 if (bpm_temp->vrf_id != bpm->vrf_id ||
1290 bpm_temp->type != bpm->type ||
1291 bpm_temp->flags != bpm->flags ||
1292 bpm_temp->tcp_flags != bpm->tcp_flags ||
1293 bpm_temp->tcp_mask_flags != bpm->tcp_mask_flags ||
1294 bpm_temp->pkt_len_min != bpm->pkt_len_min ||
1295 bpm_temp->pkt_len_max != bpm->pkt_len_max ||
1296 bpm_temp->dscp_value != bpm->dscp_value ||
1297 bpm_temp->fragment != bpm->fragment)
1298 return HASHWALK_CONTINUE;
1299
1300 /* look for remaining bpme */
1301 bpmer->bpme_found = hash_lookup(bpm->entry_hash, bpme);
1302 if (!bpmer->bpme_found)
1303 return HASHWALK_CONTINUE;
1304 return HASHWALK_ABORT;
1305 }
1306
1307 static void bgp_pbr_policyroute_remove_from_zebra_unit(struct bgp *bgp,
1308 struct bgp_info *binfo,
1309 struct bgp_pbr_filter *bpf)
1310 {
1311 struct bgp_pbr_match temp;
1312 struct bgp_pbr_match_entry temp2;
1313 struct bgp_pbr_match *bpm;
1314 struct bgp_pbr_match_entry *bpme;
1315 struct bgp_pbr_match_entry_remain bpmer;
1316 struct bgp_pbr_range_port *src_port;
1317 struct bgp_pbr_range_port *dst_port;
1318 struct bgp_pbr_range_port *pkt_len;
1319
1320 if (!bpf)
1321 return;
1322 src_port = bpf->src_port;
1323 dst_port = bpf->dst_port;
1324 pkt_len = bpf->pkt_len;
1325
1326 if (BGP_DEBUG(zebra, ZEBRA))
1327 bgp_pbr_dump_entry(bpf, false);
1328
1329 /* as we don't know information from EC
1330 * look for bpm that have the bpm
1331 * with vrf_id characteristics
1332 */
1333 memset(&temp2, 0, sizeof(temp2));
1334 memset(&temp, 0, sizeof(temp));
1335 if (bpf->src) {
1336 temp.flags |= MATCH_IP_SRC_SET;
1337 prefix_copy(&temp2.src, bpf->src);
1338 } else
1339 temp2.src.family = AF_INET;
1340 if (bpf->dst) {
1341 temp.flags |= MATCH_IP_DST_SET;
1342 prefix_copy(&temp2.dst, bpf->dst);
1343 } else
1344 temp2.dst.family = AF_INET;
1345 if (src_port && (src_port->min_port || bpf->protocol == IPPROTO_ICMP)) {
1346 if (bpf->protocol == IPPROTO_ICMP)
1347 temp.flags |= MATCH_ICMP_SET;
1348 temp.flags |= MATCH_PORT_SRC_SET;
1349 temp2.src_port_min = src_port->min_port;
1350 if (src_port->max_port) {
1351 temp.flags |= MATCH_PORT_SRC_RANGE_SET;
1352 temp2.src_port_max = src_port->max_port;
1353 }
1354 }
1355 if (dst_port && (dst_port->min_port || bpf->protocol == IPPROTO_ICMP)) {
1356 if (bpf->protocol == IPPROTO_ICMP)
1357 temp.flags |= MATCH_ICMP_SET;
1358 temp.flags |= MATCH_PORT_DST_SET;
1359 temp2.dst_port_min = dst_port->min_port;
1360 if (dst_port->max_port) {
1361 temp.flags |= MATCH_PORT_DST_RANGE_SET;
1362 temp2.dst_port_max = dst_port->max_port;
1363 }
1364 }
1365 temp2.proto = bpf->protocol;
1366
1367 if (pkt_len) {
1368 temp.pkt_len_min = pkt_len->min_port;
1369 if (pkt_len->max_port)
1370 temp.pkt_len_max = pkt_len->max_port;
1371 } else if (bpf->pkt_len_val) {
1372 if (bpf->pkt_len_val->mask)
1373 temp.flags |= MATCH_PKT_LEN_INVERSE_SET;
1374 temp.pkt_len_min = bpf->pkt_len_val->val;
1375 }
1376 if (bpf->tcp_flags) {
1377 temp.tcp_flags = bpf->tcp_flags->val;
1378 temp.tcp_mask_flags = bpf->tcp_flags->mask;
1379 }
1380 if (bpf->dscp) {
1381 if (bpf->dscp->mask)
1382 temp.flags |= MATCH_DSCP_INVERSE_SET;
1383 else
1384 temp.flags |= MATCH_DSCP_SET;
1385 temp.dscp_value = bpf->dscp->val;
1386 }
1387 if (bpf->fragment) {
1388 if (bpf->fragment->mask)
1389 temp.flags |= MATCH_FRAGMENT_INVERSE_SET;
1390 temp.fragment = bpf->fragment->val;
1391 }
1392
1393 if (bpf->src == NULL || bpf->dst == NULL) {
1394 if (temp.flags & (MATCH_PORT_DST_SET | MATCH_PORT_SRC_SET))
1395 temp.type = IPSET_NET_PORT;
1396 else
1397 temp.type = IPSET_NET;
1398 } else {
1399 if (temp.flags & (MATCH_PORT_DST_SET | MATCH_PORT_SRC_SET))
1400 temp.type = IPSET_NET_PORT_NET;
1401 else
1402 temp.type = IPSET_NET_NET;
1403 }
1404 if (bpf->vrf_id == VRF_UNKNOWN) /* XXX case BGP destroy */
1405 temp.vrf_id = 0;
1406 else
1407 temp.vrf_id = bpf->vrf_id;
1408 bpme = &temp2;
1409 bpm = &temp;
1410 bpme->backpointer = bpm;
1411 /* right now, a previous entry may already exist
1412 * flush previous entry if necessary
1413 */
1414 bpmer.bpme_to_match = bpme;
1415 bpmer.bpme_found = NULL;
1416 hash_walk(bgp->pbr_match_hash, bgp_pbr_get_remaining_entry, &bpmer);
1417 if (bpmer.bpme_found) {
1418 static struct bgp_pbr_match *local_bpm;
1419 static struct bgp_pbr_action *local_bpa;
1420
1421 local_bpm = bpmer.bpme_found->backpointer;
1422 local_bpa = local_bpm->action;
1423 bgp_pbr_flush_entry(bgp, local_bpa,
1424 local_bpm, bpmer.bpme_found);
1425 }
1426 }
1427
1428 static uint8_t bgp_pbr_next_type_entry(uint8_t type_entry)
1429 {
1430 if (type_entry == FLOWSPEC_TCP_FLAGS)
1431 return FLOWSPEC_DSCP;
1432 if (type_entry == FLOWSPEC_DSCP)
1433 return FLOWSPEC_PKT_LEN;
1434 if (type_entry == FLOWSPEC_PKT_LEN)
1435 return FLOWSPEC_FRAGMENT;
1436 if (type_entry == FLOWSPEC_FRAGMENT)
1437 return FLOWSPEC_ICMP_TYPE;
1438 return 0;
1439 }
1440
1441 static void bgp_pbr_icmp_action(struct bgp *bgp,
1442 struct bgp_info *binfo,
1443 struct bgp_pbr_filter *bpf,
1444 struct bgp_pbr_or_filter *bpof,
1445 bool add,
1446 struct nexthop *nh,
1447 float *rate)
1448 {
1449 struct bgp_pbr_range_port srcp, dstp;
1450 struct bgp_pbr_val_mask *icmp_type, *icmp_code;
1451 struct listnode *tnode, *cnode;
1452
1453 if (!bpf)
1454 return;
1455 if (bpf->protocol != IPPROTO_ICMP)
1456 return;
1457 bpf->src_port = &srcp;
1458 bpf->dst_port = &dstp;
1459 /* parse icmp type and lookup appropriate icmp code
1460 * if no icmp code found, create as many entryes as
1461 * there are listed icmp codes for that icmp type
1462 */
1463 if (!bpof->icmp_type) {
1464 srcp.min_port = 0;
1465 srcp.max_port = 255;
1466 for (ALL_LIST_ELEMENTS_RO(bpof->icmp_code, cnode, icmp_code)) {
1467 dstp.min_port = icmp_code->val;
1468 if (add)
1469 bgp_pbr_policyroute_add_to_zebra_unit(bgp, binfo,
1470 bpf, nh, rate);
1471 else
1472 bgp_pbr_policyroute_remove_from_zebra_unit(
1473 bgp, binfo, bpf);
1474 }
1475 return;
1476 }
1477 for (ALL_LIST_ELEMENTS_RO(bpof->icmp_type, tnode, icmp_type)) {
1478 srcp.min_port = icmp_type->val;
1479 srcp.max_port = 0;
1480 dstp.max_port = 0;
1481 /* only icmp type. create an entry only with icmp type */
1482 if (!bpof->icmp_code) {
1483 /* icmp type is not one of the above
1484 * forge an entry only based on the icmp type
1485 */
1486 dstp.min_port = 0;
1487 dstp.max_port = 255;
1488 if (add)
1489 bgp_pbr_policyroute_add_to_zebra_unit(
1490 bgp, binfo,
1491 bpf, nh, rate);
1492 else
1493 bgp_pbr_policyroute_remove_from_zebra_unit(bgp,
1494 binfo, bpf);
1495 continue;
1496 }
1497 for (ALL_LIST_ELEMENTS_RO(bpof->icmp_code, cnode, icmp_code)) {
1498 dstp.min_port = icmp_code->val;
1499 if (add)
1500 bgp_pbr_policyroute_add_to_zebra_unit(
1501 bgp, binfo,
1502 bpf, nh, rate);
1503 else
1504 bgp_pbr_policyroute_remove_from_zebra_unit(
1505 bgp, binfo, bpf);
1506 }
1507 }
1508 }
1509
1510 static void bgp_pbr_policyroute_remove_from_zebra_recursive(struct bgp *bgp,
1511 struct bgp_info *binfo,
1512 struct bgp_pbr_filter *bpf,
1513 struct bgp_pbr_or_filter *bpof,
1514 uint8_t type_entry)
1515 {
1516 struct listnode *node, *nnode;
1517 struct bgp_pbr_val_mask *valmask;
1518 uint8_t next_type_entry;
1519 struct list *orig_list;
1520 struct bgp_pbr_val_mask **target_val;
1521
1522 if (type_entry == 0)
1523 return bgp_pbr_policyroute_remove_from_zebra_unit(bgp,
1524 binfo, bpf);
1525 next_type_entry = bgp_pbr_next_type_entry(type_entry);
1526 if (type_entry == FLOWSPEC_TCP_FLAGS && bpof->tcpflags) {
1527 orig_list = bpof->tcpflags;
1528 target_val = &bpf->tcp_flags;
1529 } else if (type_entry == FLOWSPEC_DSCP && bpof->dscp) {
1530 orig_list = bpof->dscp;
1531 target_val = &bpf->dscp;
1532 } else if (type_entry == FLOWSPEC_PKT_LEN && bpof->pkt_len) {
1533 orig_list = bpof->pkt_len;
1534 target_val = &bpf->pkt_len_val;
1535 } else if (type_entry == FLOWSPEC_FRAGMENT && bpof->fragment) {
1536 orig_list = bpof->fragment;
1537 target_val = &bpf->fragment;
1538 } else if (type_entry == FLOWSPEC_ICMP_TYPE &&
1539 (bpof->icmp_type || bpof->icmp_code)) {
1540 /* enumerate list for icmp - must be last one */
1541 bgp_pbr_icmp_action(bgp, binfo, bpf, bpof, false, NULL, NULL);
1542 return;
1543 } else {
1544 return bgp_pbr_policyroute_remove_from_zebra_recursive(bgp,
1545 binfo,
1546 bpf, bpof,
1547 next_type_entry);
1548 }
1549 for (ALL_LIST_ELEMENTS(orig_list, node, nnode, valmask)) {
1550 *target_val = valmask;
1551 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1552 bpf, bpof,
1553 next_type_entry);
1554 }
1555 }
1556
1557 static void bgp_pbr_policyroute_remove_from_zebra(struct bgp *bgp,
1558 struct bgp_info *binfo,
1559 struct bgp_pbr_filter *bpf,
1560 struct bgp_pbr_or_filter *bpof)
1561 {
1562 if (!bpof)
1563 return bgp_pbr_policyroute_remove_from_zebra_unit(bgp,
1564 binfo,
1565 bpf);
1566 if (bpof->tcpflags)
1567 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1568 bpf, bpof,
1569 FLOWSPEC_TCP_FLAGS);
1570 else if (bpof->dscp)
1571 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1572 bpf, bpof,
1573 FLOWSPEC_DSCP);
1574 else if (bpof->pkt_len)
1575 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1576 bpf, bpof,
1577 FLOWSPEC_PKT_LEN);
1578 else if (bpof->fragment)
1579 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1580 bpf, bpof,
1581 FLOWSPEC_FRAGMENT);
1582 else if (bpof->icmp_type || bpof->icmp_code)
1583 bgp_pbr_policyroute_remove_from_zebra_recursive(bgp, binfo,
1584 bpf, bpof,
1585 FLOWSPEC_ICMP_TYPE);
1586 else
1587 bgp_pbr_policyroute_remove_from_zebra_unit(bgp, binfo, bpf);
1588 /* flush bpof */
1589 if (bpof->tcpflags)
1590 list_delete_all_node(bpof->tcpflags);
1591 if (bpof->dscp)
1592 list_delete_all_node(bpof->dscp);
1593 if (bpof->pkt_len)
1594 list_delete_all_node(bpof->pkt_len);
1595 if (bpof->fragment)
1596 list_delete_all_node(bpof->fragment);
1597 }
1598
1599 static void bgp_pbr_dump_entry(struct bgp_pbr_filter *bpf, bool add)
1600 {
1601 struct bgp_pbr_range_port *src_port;
1602 struct bgp_pbr_range_port *dst_port;
1603 struct bgp_pbr_range_port *pkt_len;
1604 char bufsrc[64], bufdst[64];
1605 char buffer[64];
1606 int remaining_len = 0;
1607 char protocol_str[16];
1608
1609 if (!bpf)
1610 return;
1611 src_port = bpf->src_port;
1612 dst_port = bpf->dst_port;
1613 pkt_len = bpf->pkt_len;
1614
1615 protocol_str[0] = '\0';
1616 if (bpf->tcp_flags && bpf->tcp_flags->mask)
1617 bpf->protocol = IPPROTO_TCP;
1618 if (bpf->protocol)
1619 snprintf(protocol_str, sizeof(protocol_str),
1620 "proto %d", bpf->protocol);
1621 buffer[0] = '\0';
1622 if (bpf->protocol == IPPROTO_ICMP && src_port && dst_port)
1623 remaining_len += snprintf(buffer, sizeof(buffer),
1624 "type %d, code %d",
1625 src_port->min_port,
1626 dst_port->min_port);
1627 else if (bpf->protocol == IPPROTO_UDP ||
1628 bpf->protocol == IPPROTO_TCP) {
1629
1630 if (src_port && src_port->min_port)
1631 remaining_len += snprintf(buffer,
1632 sizeof(buffer),
1633 "from [%u:%u]",
1634 src_port->min_port,
1635 src_port->max_port ?
1636 src_port->max_port :
1637 src_port->min_port);
1638 if (dst_port && dst_port->min_port)
1639 remaining_len += snprintf(buffer +
1640 remaining_len,
1641 sizeof(buffer)
1642 - remaining_len,
1643 "to [%u:%u]",
1644 dst_port->min_port,
1645 dst_port->max_port ?
1646 dst_port->max_port :
1647 dst_port->min_port);
1648 }
1649 if (pkt_len && (pkt_len->min_port || pkt_len->max_port)) {
1650 remaining_len += snprintf(buffer + remaining_len,
1651 sizeof(buffer)
1652 - remaining_len,
1653 " len [%u:%u]",
1654 pkt_len->min_port,
1655 pkt_len->max_port ?
1656 pkt_len->max_port :
1657 pkt_len->min_port);
1658 } else if (bpf->pkt_len_val) {
1659 remaining_len += snprintf(buffer + remaining_len,
1660 sizeof(buffer)
1661 - remaining_len,
1662 " %s len %u",
1663 bpf->pkt_len_val->mask
1664 ? "!" : "",
1665 bpf->pkt_len_val->val);
1666 }
1667 if (bpf->tcp_flags) {
1668 remaining_len += snprintf(buffer + remaining_len,
1669 sizeof(buffer)
1670 - remaining_len,
1671 "tcpflags %x/%x",
1672 bpf->tcp_flags->val,
1673 bpf->tcp_flags->mask);
1674 }
1675 if (bpf->dscp) {
1676 snprintf(buffer + remaining_len,
1677 sizeof(buffer)
1678 - remaining_len,
1679 "%s dscp %d",
1680 bpf->dscp->mask
1681 ? "!" : "",
1682 bpf->dscp->val);
1683 }
1684 zlog_debug("BGP: %s FS PBR from %s to %s, %s %s",
1685 add ? "adding" : "removing",
1686 bpf->src == NULL ? "<all>" :
1687 prefix2str(bpf->src, bufsrc, sizeof(bufsrc)),
1688 bpf->dst == NULL ? "<all>" :
1689 prefix2str(bpf->dst, bufdst, sizeof(bufdst)),
1690 protocol_str, buffer);
1691
1692 }
1693
1694 static void bgp_pbr_policyroute_add_to_zebra_unit(struct bgp *bgp,
1695 struct bgp_info *binfo,
1696 struct bgp_pbr_filter *bpf,
1697 struct nexthop *nh,
1698 float *rate)
1699 {
1700 struct bgp_pbr_match temp;
1701 struct bgp_pbr_match_entry temp2;
1702 struct bgp_pbr_match *bpm;
1703 struct bgp_pbr_match_entry *bpme = NULL;
1704 struct bgp_pbr_action temp3;
1705 struct bgp_pbr_action *bpa = NULL;
1706 struct bgp_pbr_match_entry_remain bpmer;
1707 struct bgp_pbr_range_port *src_port;
1708 struct bgp_pbr_range_port *dst_port;
1709 struct bgp_pbr_range_port *pkt_len;
1710 bool bpme_found = false;
1711
1712 if (!bpf)
1713 return;
1714 src_port = bpf->src_port;
1715 dst_port = bpf->dst_port;
1716 pkt_len = bpf->pkt_len;
1717
1718 if (BGP_DEBUG(zebra, ZEBRA))
1719 bgp_pbr_dump_entry(bpf, true);
1720
1721 /* look for bpa first */
1722 memset(&temp3, 0, sizeof(temp3));
1723 if (rate)
1724 temp3.rate = *rate;
1725 if (nh)
1726 memcpy(&temp3.nh, nh, sizeof(struct nexthop));
1727 temp3.vrf_id = bpf->vrf_id;
1728 bpa = hash_get(bgp->pbr_action_hash, &temp3,
1729 bgp_pbr_action_alloc_intern);
1730
1731 if (bpa->fwmark == 0) {
1732 /* drop is handled by iptable */
1733 if (nh && nh->type == NEXTHOP_TYPE_BLACKHOLE) {
1734 bpa->table_id = 0;
1735 bpa->installed = true;
1736 } else {
1737 bpa->fwmark = bgp_zebra_tm_get_id();
1738 bpa->table_id = bpa->fwmark;
1739 bpa->installed = false;
1740 }
1741 bpa->bgp = bgp;
1742 bpa->unique = ++bgp_pbr_action_counter_unique;
1743 /* 0 value is forbidden */
1744 bpa->install_in_progress = false;
1745 }
1746
1747 /* then look for bpm */
1748 memset(&temp, 0, sizeof(temp));
1749 temp.vrf_id = bpf->vrf_id;
1750 if (bpf->src)
1751 temp.flags |= MATCH_IP_SRC_SET;
1752 if (bpf->dst)
1753 temp.flags |= MATCH_IP_DST_SET;
1754
1755 if (src_port && (src_port->min_port || bpf->protocol == IPPROTO_ICMP)) {
1756 if (bpf->protocol == IPPROTO_ICMP)
1757 temp.flags |= MATCH_ICMP_SET;
1758 temp.flags |= MATCH_PORT_SRC_SET;
1759 }
1760 if (dst_port && (dst_port->min_port || bpf->protocol == IPPROTO_ICMP)) {
1761 if (bpf->protocol == IPPROTO_ICMP)
1762 temp.flags |= MATCH_ICMP_SET;
1763 temp.flags |= MATCH_PORT_DST_SET;
1764 }
1765 if (src_port && src_port->max_port)
1766 temp.flags |= MATCH_PORT_SRC_RANGE_SET;
1767 if (dst_port && dst_port->max_port)
1768 temp.flags |= MATCH_PORT_DST_RANGE_SET;
1769
1770 if (bpf->src == NULL || bpf->dst == NULL) {
1771 if (temp.flags & (MATCH_PORT_DST_SET | MATCH_PORT_SRC_SET))
1772 temp.type = IPSET_NET_PORT;
1773 else
1774 temp.type = IPSET_NET;
1775 } else {
1776 if (temp.flags & (MATCH_PORT_DST_SET | MATCH_PORT_SRC_SET))
1777 temp.type = IPSET_NET_PORT_NET;
1778 else
1779 temp.type = IPSET_NET_NET;
1780 }
1781 if (pkt_len) {
1782 temp.pkt_len_min = pkt_len->min_port;
1783 if (pkt_len->max_port)
1784 temp.pkt_len_max = pkt_len->max_port;
1785 } else if (bpf->pkt_len_val) {
1786 if (bpf->pkt_len_val->mask)
1787 temp.flags |= MATCH_PKT_LEN_INVERSE_SET;
1788 temp.pkt_len_min = bpf->pkt_len_val->val;
1789 }
1790 if (bpf->tcp_flags) {
1791 temp.tcp_flags = bpf->tcp_flags->val;
1792 temp.tcp_mask_flags = bpf->tcp_flags->mask;
1793 }
1794 if (bpf->dscp) {
1795 if (bpf->dscp->mask)
1796 temp.flags |= MATCH_DSCP_INVERSE_SET;
1797 else
1798 temp.flags |= MATCH_DSCP_SET;
1799 temp.dscp_value = bpf->dscp->val;
1800 }
1801 if (bpf->fragment) {
1802 if (bpf->fragment->mask)
1803 temp.flags |= MATCH_FRAGMENT_INVERSE_SET;
1804 temp.fragment = bpf->fragment->val;
1805 }
1806 temp.action = bpa;
1807 bpm = hash_get(bgp->pbr_match_hash, &temp,
1808 bgp_pbr_match_alloc_intern);
1809
1810 /* new, then self allocate ipset_name and unique */
1811 if (bpm->unique == 0) {
1812 bpm->unique = ++bgp_pbr_match_counter_unique;
1813 /* 0 value is forbidden */
1814 sprintf(bpm->ipset_name, "match%p", bpm);
1815 bpm->entry_hash = hash_create_size(8,
1816 bgp_pbr_match_entry_hash_key,
1817 bgp_pbr_match_entry_hash_equal,
1818 "Match Entry Hash");
1819 bpm->installed = false;
1820
1821 /* unique2 should be updated too */
1822 bpm->unique2 = ++bgp_pbr_match_iptable_counter_unique;
1823 bpm->installed_in_iptable = false;
1824 bpm->install_in_progress = false;
1825 bpm->install_iptable_in_progress = false;
1826 }
1827
1828 memset(&temp2, 0, sizeof(temp2));
1829 if (bpf->src)
1830 prefix_copy(&temp2.src, bpf->src);
1831 else
1832 temp2.src.family = AF_INET;
1833 if (bpf->dst)
1834 prefix_copy(&temp2.dst, bpf->dst);
1835 else
1836 temp2.dst.family = AF_INET;
1837 temp2.src_port_min = src_port ? src_port->min_port : 0;
1838 temp2.dst_port_min = dst_port ? dst_port->min_port : 0;
1839 temp2.src_port_max = src_port ? src_port->max_port : 0;
1840 temp2.dst_port_max = dst_port ? dst_port->max_port : 0;
1841 temp2.proto = bpf->protocol;
1842 bpme = hash_get(bpm->entry_hash, &temp2,
1843 bgp_pbr_match_entry_alloc_intern);
1844 if (bpme->unique == 0) {
1845 bpme->unique = ++bgp_pbr_match_entry_counter_unique;
1846 /* 0 value is forbidden */
1847 bpme->backpointer = bpm;
1848 bpme->installed = false;
1849 bpme->install_in_progress = false;
1850 /* link bgp info to bpme */
1851 bpme->bgp_info = (void *)binfo;
1852 } else
1853 bpme_found = true;
1854
1855 /* already installed */
1856 if (bpme_found) {
1857 struct bgp_info_extra *extra = bgp_info_extra_get(binfo);
1858
1859 if (extra && extra->bgp_fs_pbr &&
1860 listnode_lookup(extra->bgp_fs_pbr, bpme)) {
1861 if (BGP_DEBUG(pbr, PBR_ERROR))
1862 zlog_err("%s: entry %p/%p already installed in bgp pbr",
1863 __func__, binfo, bpme);
1864 return;
1865 }
1866 }
1867 /* BGP FS: append entry to zebra
1868 * - policies are not routing entries and as such
1869 * route replace semantics don't necessarily follow
1870 * through to policy entries
1871 * - because of that, not all policing information will be stored
1872 * into zebra. and non selected policies will be suppressed from zebra
1873 * - as consequence, in order to bring consistency
1874 * a policy will be added, then ifan ecmp policy exists,
1875 * it will be suppressed subsequently
1876 */
1877 /* ip rule add */
1878 if (!bpa->installed && !bpa->install_in_progress) {
1879 bgp_send_pbr_rule_action(bpa, true);
1880 bgp_zebra_announce_default(bgp, nh,
1881 AFI_IP, bpa->table_id, true);
1882 }
1883
1884 /* ipset create */
1885 if (bpm && !bpm->installed)
1886 bgp_send_pbr_ipset_match(bpm, true);
1887 /* ipset add */
1888 if (bpme && !bpme->installed)
1889 bgp_send_pbr_ipset_entry_match(bpme, true);
1890
1891 /* iptables */
1892 if (bpm && !bpm->installed_in_iptable)
1893 bgp_send_pbr_iptable(bpa, bpm, true);
1894
1895 /* A previous entry may already exist
1896 * flush previous entry if necessary
1897 */
1898 bpmer.bpme_to_match = bpme;
1899 bpmer.bpme_found = NULL;
1900 hash_walk(bgp->pbr_match_hash, bgp_pbr_get_remaining_entry, &bpmer);
1901 if (bpmer.bpme_found) {
1902 static struct bgp_pbr_match *local_bpm;
1903 static struct bgp_pbr_action *local_bpa;
1904
1905 local_bpm = bpmer.bpme_found->backpointer;
1906 local_bpa = local_bpm->action;
1907 bgp_pbr_flush_entry(bgp, local_bpa,
1908 local_bpm, bpmer.bpme_found);
1909 }
1910
1911
1912 }
1913
1914 static void bgp_pbr_policyroute_add_to_zebra_recursive(struct bgp *bgp,
1915 struct bgp_info *binfo,
1916 struct bgp_pbr_filter *bpf,
1917 struct bgp_pbr_or_filter *bpof,
1918 struct nexthop *nh,
1919 float *rate,
1920 uint8_t type_entry)
1921 {
1922 struct listnode *node, *nnode;
1923 struct bgp_pbr_val_mask *valmask;
1924 uint8_t next_type_entry;
1925 struct list *orig_list;
1926 struct bgp_pbr_val_mask **target_val;
1927
1928 if (type_entry == 0)
1929 return bgp_pbr_policyroute_add_to_zebra_unit(bgp, binfo, bpf,
1930 nh, rate);
1931 next_type_entry = bgp_pbr_next_type_entry(type_entry);
1932 if (type_entry == FLOWSPEC_TCP_FLAGS && bpof->tcpflags) {
1933 orig_list = bpof->tcpflags;
1934 target_val = &bpf->tcp_flags;
1935 } else if (type_entry == FLOWSPEC_DSCP && bpof->dscp) {
1936 orig_list = bpof->dscp;
1937 target_val = &bpf->dscp;
1938 } else if (type_entry == FLOWSPEC_PKT_LEN && bpof->pkt_len) {
1939 orig_list = bpof->pkt_len;
1940 target_val = &bpf->pkt_len_val;
1941 } else if (type_entry == FLOWSPEC_FRAGMENT && bpof->fragment) {
1942 orig_list = bpof->fragment;
1943 target_val = &bpf->fragment;
1944 } else if (type_entry == FLOWSPEC_ICMP_TYPE &&
1945 (bpof->icmp_type || bpof->icmp_code)) {
1946 /* enumerate list for icmp - must be last one */
1947 bgp_pbr_icmp_action(bgp, binfo, bpf, bpof, true, nh, rate);
1948 return;
1949 } else {
1950 return bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1951 bpf, bpof, nh, rate,
1952 next_type_entry);
1953 }
1954 for (ALL_LIST_ELEMENTS(orig_list, node, nnode, valmask)) {
1955 *target_val = valmask;
1956 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1957 bpf, bpof,
1958 nh, rate,
1959 next_type_entry);
1960 }
1961 }
1962
1963 static void bgp_pbr_policyroute_add_to_zebra(struct bgp *bgp,
1964 struct bgp_info *binfo,
1965 struct bgp_pbr_filter *bpf,
1966 struct bgp_pbr_or_filter *bpof,
1967 struct nexthop *nh,
1968 float *rate)
1969 {
1970 if (!bpof)
1971 return bgp_pbr_policyroute_add_to_zebra_unit(bgp, binfo,
1972 bpf, nh, rate);
1973 if (bpof->tcpflags)
1974 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1975 bpf, bpof,
1976 nh, rate,
1977 FLOWSPEC_TCP_FLAGS);
1978 else if (bpof->dscp)
1979 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1980 bpf, bpof,
1981 nh, rate,
1982 FLOWSPEC_DSCP);
1983 else if (bpof->pkt_len)
1984 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1985 bpf, bpof,
1986 nh, rate,
1987 FLOWSPEC_PKT_LEN);
1988 else if (bpof->fragment)
1989 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1990 bpf, bpof,
1991 nh, rate,
1992 FLOWSPEC_FRAGMENT);
1993 else if (bpof->icmp_type || bpof->icmp_code)
1994 bgp_pbr_policyroute_add_to_zebra_recursive(bgp, binfo,
1995 bpf, bpof, nh, rate,
1996 FLOWSPEC_ICMP_TYPE);
1997 else
1998 bgp_pbr_policyroute_add_to_zebra_unit(bgp, binfo, bpf,
1999 nh, rate);
2000 /* flush bpof */
2001 if (bpof->tcpflags)
2002 list_delete_all_node(bpof->tcpflags);
2003 if (bpof->dscp)
2004 list_delete_all_node(bpof->dscp);
2005 if (bpof->pkt_len)
2006 list_delete_all_node(bpof->pkt_len);
2007 if (bpof->fragment)
2008 list_delete_all_node(bpof->fragment);
2009 if (bpof->icmp_type)
2010 list_delete_all_node(bpof->icmp_type);
2011 if (bpof->icmp_code)
2012 list_delete_all_node(bpof->icmp_code);
2013 }
2014
2015 static void bgp_pbr_handle_entry(struct bgp *bgp,
2016 struct bgp_info *binfo,
2017 struct bgp_pbr_entry_main *api,
2018 bool add)
2019 {
2020 struct nexthop nh;
2021 int i = 0;
2022 int continue_loop = 1;
2023 float rate = 0;
2024 struct prefix *src = NULL, *dst = NULL;
2025 uint8_t proto = 0;
2026 struct bgp_pbr_range_port *srcp = NULL, *dstp = NULL;
2027 struct bgp_pbr_range_port range, range_icmp_code;
2028 struct bgp_pbr_range_port pkt_len;
2029 struct bgp_pbr_filter bpf;
2030 uint8_t kind_enum;
2031 struct bgp_pbr_or_filter bpof;
2032 struct bgp_pbr_val_mask bpvm;
2033
2034 memset(&nh, 0, sizeof(struct nexthop));
2035 memset(&bpf, 0, sizeof(struct bgp_pbr_filter));
2036 memset(&bpof, 0, sizeof(struct bgp_pbr_or_filter));
2037 if (api->match_bitmask & PREFIX_SRC_PRESENT)
2038 src = &api->src_prefix;
2039 if (api->match_bitmask & PREFIX_DST_PRESENT)
2040 dst = &api->dst_prefix;
2041 memset(&nh, 0, sizeof(struct nexthop));
2042 nh.vrf_id = VRF_UNKNOWN;
2043 if (api->match_protocol_num)
2044 proto = (uint8_t)api->protocol[0].value;
2045 /* if match_port is selected, then either src or dst port will be parsed
2046 * but not both at the same time
2047 */
2048 if (api->match_port_num >= 1) {
2049 bgp_pbr_extract(api->port,
2050 api->match_port_num,
2051 &range);
2052 srcp = dstp = &range;
2053 } else if (api->match_src_port_num >= 1) {
2054 bgp_pbr_extract(api->src_port,
2055 api->match_src_port_num,
2056 &range);
2057 srcp = &range;
2058 dstp = NULL;
2059 } else if (api->match_dst_port_num >= 1) {
2060 bgp_pbr_extract(api->dst_port,
2061 api->match_dst_port_num,
2062 &range);
2063 dstp = &range;
2064 srcp = NULL;
2065 }
2066 if (api->match_icmp_type_num >= 1) {
2067 proto = IPPROTO_ICMP;
2068 if (bgp_pbr_extract(api->icmp_type,
2069 api->match_icmp_type_num,
2070 &range))
2071 srcp = &range;
2072 else {
2073 bpof.icmp_type = list_new();
2074 bgp_pbr_extract_enumerate(api->icmp_type,
2075 api->match_icmp_type_num,
2076 OPERATOR_UNARY_OR,
2077 bpof.icmp_type,
2078 FLOWSPEC_ICMP_TYPE);
2079 }
2080 }
2081 if (api->match_icmp_code_num >= 1) {
2082 proto = IPPROTO_ICMP;
2083 if (bgp_pbr_extract(api->icmp_code,
2084 api->match_icmp_code_num,
2085 &range_icmp_code))
2086 dstp = &range_icmp_code;
2087 else {
2088 bpof.icmp_code = list_new();
2089 bgp_pbr_extract_enumerate(api->icmp_code,
2090 api->match_icmp_code_num,
2091 OPERATOR_UNARY_OR,
2092 bpof.icmp_code,
2093 FLOWSPEC_ICMP_CODE);
2094 }
2095 }
2096
2097 if (api->match_tcpflags_num) {
2098 kind_enum = bgp_pbr_match_val_get_operator(api->tcpflags,
2099 api->match_tcpflags_num);
2100 if (kind_enum == OPERATOR_UNARY_AND) {
2101 bpf.tcp_flags = &bpvm;
2102 bgp_pbr_extract_enumerate(api->tcpflags,
2103 api->match_tcpflags_num,
2104 OPERATOR_UNARY_AND,
2105 bpf.tcp_flags,
2106 FLOWSPEC_TCP_FLAGS);
2107 } else if (kind_enum == OPERATOR_UNARY_OR) {
2108 bpof.tcpflags = list_new();
2109 bgp_pbr_extract_enumerate(api->tcpflags,
2110 api->match_tcpflags_num,
2111 OPERATOR_UNARY_OR,
2112 bpof.tcpflags,
2113 FLOWSPEC_TCP_FLAGS);
2114 }
2115 }
2116 if (api->match_packet_length_num) {
2117 bool ret;
2118
2119 ret = bgp_pbr_extract(api->packet_length,
2120 api->match_packet_length_num,
2121 &pkt_len);
2122 if (ret)
2123 bpf.pkt_len = &pkt_len;
2124 else {
2125 bpof.pkt_len = list_new();
2126 bgp_pbr_extract_enumerate(api->packet_length,
2127 api->match_packet_length_num,
2128 OPERATOR_UNARY_OR,
2129 bpof.pkt_len,
2130 FLOWSPEC_PKT_LEN);
2131 }
2132 }
2133 if (api->match_dscp_num >= 1) {
2134 bpof.dscp = list_new();
2135 bgp_pbr_extract_enumerate(api->dscp, api->match_dscp_num,
2136 OPERATOR_UNARY_OR,
2137 bpof.dscp, FLOWSPEC_DSCP);
2138 }
2139 if (api->match_fragment_num) {
2140 bpof.fragment = list_new();
2141 bgp_pbr_extract_enumerate(api->fragment,
2142 api->match_fragment_num,
2143 OPERATOR_UNARY_OR,
2144 bpof.fragment,
2145 FLOWSPEC_FRAGMENT);
2146 }
2147 bpf.vrf_id = api->vrf_id;
2148 bpf.src = src;
2149 bpf.dst = dst;
2150 bpf.protocol = proto;
2151 bpf.src_port = srcp;
2152 bpf.dst_port = dstp;
2153 if (!add)
2154 return bgp_pbr_policyroute_remove_from_zebra(bgp,
2155 binfo,
2156 &bpf, &bpof);
2157 /* no action for add = true */
2158 for (i = 0; i < api->action_num; i++) {
2159 switch (api->actions[i].action) {
2160 case ACTION_TRAFFICRATE:
2161 /* drop packet */
2162 if (api->actions[i].u.r.rate == 0) {
2163 nh.vrf_id = api->vrf_id;
2164 nh.type = NEXTHOP_TYPE_BLACKHOLE;
2165 bgp_pbr_policyroute_add_to_zebra(bgp, binfo,
2166 &bpf, &bpof,
2167 &nh, &rate);
2168 } else {
2169 /* update rate. can be reentrant */
2170 rate = api->actions[i].u.r.rate;
2171 if (BGP_DEBUG(pbr, PBR)) {
2172 bgp_pbr_print_policy_route(api);
2173 zlog_warn("PBR: ignoring Set action rate %f",
2174 api->actions[i].u.r.rate);
2175 }
2176 }
2177 break;
2178 case ACTION_TRAFFIC_ACTION:
2179 if (api->actions[i].u.za.filter
2180 & TRAFFIC_ACTION_SAMPLE) {
2181 if (BGP_DEBUG(pbr, PBR)) {
2182 bgp_pbr_print_policy_route(api);
2183 zlog_warn("PBR: Sample action Ignored");
2184 }
2185 }
2186 #if 0
2187 if (api->actions[i].u.za.filter
2188 & TRAFFIC_ACTION_DISTRIBUTE) {
2189 if (BGP_DEBUG(pbr, PBR)) {
2190 bgp_pbr_print_policy_route(api);
2191 zlog_warn("PBR: Distribute action Applies");
2192 }
2193 continue_loop = 0;
2194 /* continue forwarding entry as before
2195 * no action
2196 */
2197 }
2198 #endif /* XXX to confirm behaviour of traffic action. for now , ignore */
2199 /* terminate action: run other filters
2200 */
2201 break;
2202 case ACTION_REDIRECT_IP:
2203 nh.type = NEXTHOP_TYPE_IPV4;
2204 nh.gate.ipv4.s_addr =
2205 api->actions[i].u.zr.redirect_ip_v4.s_addr;
2206 nh.vrf_id = api->vrf_id;
2207 bgp_pbr_policyroute_add_to_zebra(bgp, binfo,
2208 &bpf, &bpof,
2209 &nh, &rate);
2210 /* XXX combination with REDIRECT_VRF
2211 * + REDIRECT_NH_IP not done
2212 */
2213 continue_loop = 0;
2214 break;
2215 case ACTION_REDIRECT:
2216 nh.vrf_id = api->actions[i].u.redirect_vrf;
2217 nh.type = NEXTHOP_TYPE_IPV4;
2218 bgp_pbr_policyroute_add_to_zebra(bgp, binfo,
2219 &bpf, &bpof,
2220 &nh, &rate);
2221 continue_loop = 0;
2222 break;
2223 case ACTION_MARKING:
2224 if (BGP_DEBUG(pbr, PBR)) {
2225 bgp_pbr_print_policy_route(api);
2226 zlog_warn("PBR: Set DSCP %u Ignored",
2227 api->actions[i].u.marking_dscp);
2228 }
2229 break;
2230 default:
2231 break;
2232 }
2233 if (continue_loop == 0)
2234 break;
2235 }
2236 }
2237
2238 void bgp_pbr_update_entry(struct bgp *bgp, struct prefix *p,
2239 struct bgp_info *info, afi_t afi, safi_t safi,
2240 bool nlri_update)
2241 {
2242 struct bgp_pbr_entry_main api;
2243
2244 if (afi == AFI_IP6)
2245 return; /* IPv6 not supported */
2246 if (safi != SAFI_FLOWSPEC)
2247 return; /* not supported */
2248 /* Make Zebra API structure. */
2249 memset(&api, 0, sizeof(api));
2250 api.vrf_id = bgp->vrf_id;
2251 api.afi = afi;
2252
2253 if (!bgp_zebra_tm_chunk_obtained()) {
2254 if (BGP_DEBUG(pbr, PBR_ERROR))
2255 flog_err(EC_BGP_TABLE_CHUNK,
2256 "%s: table chunk not obtained yet", __func__);
2257 return;
2258 }
2259
2260 if (bgp_pbr_build_and_validate_entry(p, info, &api) < 0) {
2261 if (BGP_DEBUG(pbr, PBR_ERROR))
2262 flog_err(EC_BGP_FLOWSPEC_INSTALLATION,
2263 "%s: cancel updating entry %p in bgp pbr",
2264 __func__, info);
2265 return;
2266 }
2267 bgp_pbr_handle_entry(bgp, info, &api, nlri_update);
2268 }
2269
2270 int bgp_pbr_interface_compare(const struct bgp_pbr_interface *a,
2271 const struct bgp_pbr_interface *b)
2272 {
2273 return strcmp(a->name, b->name);
2274 }
2275
2276 struct bgp_pbr_interface *bgp_pbr_interface_lookup(const char *name,
2277 struct bgp_pbr_interface_head *head)
2278 {
2279 struct bgp_pbr_interface pbr_if;
2280
2281 strlcpy(pbr_if.name, name, sizeof(pbr_if.name));
2282 return (RB_FIND(bgp_pbr_interface_head,
2283 head, &pbr_if));
2284 }
2285
2286 /* this function resets to the default policy routing
2287 * go back to default status
2288 */
2289 void bgp_pbr_reset(struct bgp *bgp, afi_t afi)
2290 {
2291 struct bgp_pbr_config *bgp_pbr_cfg = bgp->bgp_pbr_cfg;
2292 struct bgp_pbr_interface_head *head;
2293 struct bgp_pbr_interface *pbr_if;
2294
2295 if (!bgp_pbr_cfg || afi != AFI_IP)
2296 return;
2297 head = &(bgp_pbr_cfg->ifaces_by_name_ipv4);
2298
2299 while (!RB_EMPTY(bgp_pbr_interface_head, head)) {
2300 pbr_if = RB_ROOT(bgp_pbr_interface_head, head);
2301 RB_REMOVE(bgp_pbr_interface_head, head, pbr_if);
2302 XFREE(MTYPE_TMP, pbr_if);
2303 }
2304 }
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