2 * edns-subnet/subnetmod.c - edns subnet module. Must be called before validator
5 * Copyright (c) 2013, NLnet Labs. All rights reserved.
7 * This software is open source.
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10 * modification, are permitted provided that the following conditions
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34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38 * subnet module for unbound.
43 #ifdef CLIENT_SUBNET /* keeps splint happy */
45 #include "edns-subnet/subnetmod.h"
46 #include "edns-subnet/edns-subnet.h"
47 #include "edns-subnet/addrtree.h"
48 #include "edns-subnet/subnet-whitelist.h"
50 #include "services/mesh.h"
51 #include "services/cache/dns.h"
52 #include "util/module.h"
53 #include "util/regional.h"
54 #include "util/storage/slabhash.h"
55 #include "util/config_file.h"
56 #include "util/data/msgreply.h"
57 #include "sldns/sbuffer.h"
59 #define ECS_MAX_TREESIZE 100
61 /** externally called */
63 subnet_data_delete(void *d, void *ATTR_UNUSED(arg))
65 struct subnet_msg_cache_data *r;
66 r = (struct subnet_msg_cache_data*)d;
67 addrtree_delete(r->tree4);
68 addrtree_delete(r->tree6);
72 /** externally called */
74 msg_cache_sizefunc(void *k, void *d)
76 struct msgreply_entry *q = (struct msgreply_entry*)k;
77 struct subnet_msg_cache_data *r = (struct subnet_msg_cache_data*)d;
78 size_t s = sizeof(struct msgreply_entry)
79 + sizeof(struct subnet_msg_cache_data)
80 + q->key.qname_len + lock_get_mem(&q->entry.lock);
81 s += addrtree_size(r->tree4);
82 s += addrtree_size(r->tree6);
86 /** new query for ecs module */
88 subnet_new_qstate(struct module_qstate *qstate, int id)
90 struct subnet_qstate *sq = (struct subnet_qstate*)regional_alloc(
91 qstate->region, sizeof(struct subnet_qstate));
94 qstate->minfo[id] = sq;
95 memset(sq, 0, sizeof(*sq));
99 /** Add ecs struct to edns list, after parsing it to wire format. */
101 ecs_opt_list_append(struct ecs_data* ecs, struct edns_option** list,
102 struct module_qstate *qstate)
104 size_t sn_octs, sn_octs_remainder;
105 sldns_buffer* buf = qstate->env->scratch_buffer;
107 if(ecs->subnet_validdata) {
108 log_assert(ecs->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP4 ||
109 ecs->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP6);
110 log_assert(ecs->subnet_addr_fam != EDNSSUBNET_ADDRFAM_IP4 ||
111 ecs->subnet_source_mask <= INET_SIZE*8);
112 log_assert(ecs->subnet_addr_fam != EDNSSUBNET_ADDRFAM_IP6 ||
113 ecs->subnet_source_mask <= INET6_SIZE*8);
115 sn_octs = ecs->subnet_source_mask / 8;
117 (size_t)((ecs->subnet_source_mask % 8)>0?1:0);
119 log_assert(sn_octs + sn_octs_remainder <= INET6_SIZE);
121 sldns_buffer_clear(buf);
122 sldns_buffer_write_u16(buf, ecs->subnet_addr_fam);
123 sldns_buffer_write_u8(buf, ecs->subnet_source_mask);
124 sldns_buffer_write_u8(buf, ecs->subnet_scope_mask);
125 sldns_buffer_write(buf, ecs->subnet_addr, sn_octs);
126 if(sn_octs_remainder)
127 sldns_buffer_write_u8(buf, ecs->subnet_addr[sn_octs] &
128 ~(0xFF >> (ecs->subnet_source_mask % 8)));
129 sldns_buffer_flip(buf);
131 edns_opt_list_append(list,
132 qstate->env->cfg->client_subnet_opcode,
133 sn_octs + sn_octs_remainder + 4,
134 sldns_buffer_begin(buf), qstate->region);
138 int ecs_whitelist_check(struct query_info* qinfo,
139 uint16_t ATTR_UNUSED(flags), struct module_qstate* qstate,
140 struct sockaddr_storage* addr, socklen_t addrlen,
141 uint8_t* ATTR_UNUSED(zone), size_t ATTR_UNUSED(zonelen),
142 struct regional* ATTR_UNUSED(region), int id, void* ATTR_UNUSED(cbargs))
144 struct subnet_qstate *sq;
145 struct subnet_env *sn_env;
147 if(!(sq=(struct subnet_qstate*)qstate->minfo[id]))
149 sn_env = (struct subnet_env*)qstate->env->modinfo[id];
151 /* Cache by default, might be disabled after parsing EDNS option
152 * received from nameserver. */
153 qstate->no_cache_store = 0;
155 if(sq->ecs_server_out.subnet_validdata && ((sq->subnet_downstream &&
156 qstate->env->cfg->client_subnet_always_forward) ||
157 ecs_is_whitelisted(sn_env->whitelist,
158 addr, addrlen, qinfo->qname, qinfo->qname_len,
160 /* Address on whitelist or client query contains ECS option, we
161 * want to sent out ECS. Only add option if it is not already
163 if(!(sq->subnet_sent)) {
164 ecs_opt_list_append(&sq->ecs_server_out,
165 &qstate->edns_opts_back_out, qstate);
169 else if(sq->subnet_sent) {
170 /* Outgoing ECS option is set, but we don't want to sent it to
171 * this address, remove option. */
172 edns_opt_list_remove(&qstate->edns_opts_back_out,
173 qstate->env->cfg->client_subnet_opcode);
181 subnetmod_init(struct module_env *env, int id)
183 struct subnet_env *sn_env = (struct subnet_env*)calloc(1,
184 sizeof(struct subnet_env));
186 log_err("malloc failure");
189 alloc_init(&sn_env->alloc, NULL, 0);
190 env->modinfo[id] = (void*)sn_env;
191 /* Copy msg_cache settings */
192 sn_env->subnet_msg_cache = slabhash_create(env->cfg->msg_cache_slabs,
193 HASH_DEFAULT_STARTARRAY, env->cfg->msg_cache_size,
194 msg_cache_sizefunc, query_info_compare, query_entry_delete,
195 subnet_data_delete, NULL);
196 if(!sn_env->subnet_msg_cache) {
197 log_err("subnet: could not create cache");
199 env->modinfo[id] = NULL;
202 /* whitelist for edns subnet capable servers */
203 sn_env->whitelist = ecs_whitelist_create();
204 if(!sn_env->whitelist ||
205 !ecs_whitelist_apply_cfg(sn_env->whitelist, env->cfg)) {
206 log_err("subnet: could not create ECS whitelist");
207 slabhash_delete(sn_env->subnet_msg_cache);
209 env->modinfo[id] = NULL;
213 verbose(VERB_QUERY, "subnet: option registered (%d)",
214 env->cfg->client_subnet_opcode);
215 /* Create new mesh state for all queries. */
216 env->unique_mesh = 1;
217 if(!edns_register_option(env->cfg->client_subnet_opcode,
218 env->cfg->client_subnet_always_forward /* bypass cache */,
219 0 /* no aggregation */, env)) {
220 log_err("subnet: could not register opcode");
221 ecs_whitelist_delete(sn_env->whitelist);
222 slabhash_delete(sn_env->subnet_msg_cache);
224 env->modinfo[id] = NULL;
227 inplace_cb_register((void*)ecs_whitelist_check, inplace_cb_query, NULL,
229 inplace_cb_register((void*)ecs_edns_back_parsed,
230 inplace_cb_edns_back_parsed, NULL, env, id);
231 inplace_cb_register((void*)ecs_query_response,
232 inplace_cb_query_response, NULL, env, id);
233 lock_rw_init(&sn_env->biglock);
238 subnetmod_deinit(struct module_env *env, int id)
240 struct subnet_env *sn_env;
241 if(!env || !env->modinfo[id])
243 sn_env = (struct subnet_env*)env->modinfo[id];
244 lock_rw_destroy(&sn_env->biglock);
245 inplace_cb_delete(env, inplace_cb_edns_back_parsed, id);
246 inplace_cb_delete(env, inplace_cb_query, id);
247 inplace_cb_delete(env, inplace_cb_query_response, id);
248 ecs_whitelist_delete(sn_env->whitelist);
249 slabhash_delete(sn_env->subnet_msg_cache);
250 alloc_clear(&sn_env->alloc);
252 env->modinfo[id] = NULL;
255 /** Tells client that upstream has no/improper support */
257 cp_edns_bad_response(struct ecs_data *target, struct ecs_data *source)
259 target->subnet_scope_mask = 0;
260 target->subnet_source_mask = source->subnet_source_mask;
261 target->subnet_addr_fam = source->subnet_addr_fam;
262 memcpy(target->subnet_addr, source->subnet_addr, INET6_SIZE);
263 target->subnet_validdata = 1;
267 delfunc(void *envptr, void *elemptr) {
268 struct reply_info *elem = (struct reply_info *)elemptr;
269 struct subnet_env *env = (struct subnet_env *)envptr;
270 reply_info_parsedelete(elem, &env->alloc);
274 sizefunc(void *elemptr) {
275 struct reply_info *elem = (struct reply_info *)elemptr;
276 return sizeof (struct reply_info) - sizeof (struct rrset_ref)
277 + elem->rrset_count * sizeof (struct rrset_ref)
278 + elem->rrset_count * sizeof (struct ub_packed_rrset_key *);
282 * Select tree from cache entry based on edns data.
283 * If for address family not present it will create a new one.
284 * NULL on failure to create. */
285 static struct addrtree*
286 get_tree(struct subnet_msg_cache_data *data, struct ecs_data *edns,
287 struct subnet_env *env, struct config_file* cfg)
289 struct addrtree *tree;
290 if (edns->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP4) {
292 data->tree4 = addrtree_create(
293 cfg->max_client_subnet_ipv4, &delfunc,
294 &sizefunc, env, ECS_MAX_TREESIZE);
298 data->tree6 = addrtree_create(
299 cfg->max_client_subnet_ipv6, &delfunc,
300 &sizefunc, env, ECS_MAX_TREESIZE);
307 update_cache(struct module_qstate *qstate, int id)
309 struct msgreply_entry *mrep_entry;
310 struct addrtree *tree;
311 struct reply_info *rep;
312 struct query_info qinf;
313 struct subnet_env *sne = qstate->env->modinfo[id];
314 struct subnet_qstate *sq = (struct subnet_qstate*)qstate->minfo[id];
315 struct slabhash *subnet_msg_cache = sne->subnet_msg_cache;
316 struct ecs_data *edns = &sq->ecs_client_in;
319 /* We already calculated hash upon lookup */
320 hashvalue_type h = qstate->minfo[id] ?
321 ((struct subnet_qstate*)qstate->minfo[id])->qinfo_hash :
322 query_info_hash(&qstate->qinfo, qstate->query_flags);
323 /* Step 1, general qinfo lookup */
324 struct lruhash_entry *lru_entry = slabhash_lookup(subnet_msg_cache, h,
326 int acquired_lock = (lru_entry != NULL);
328 qinf = qstate->qinfo;
329 qinf.qname = memdup(qstate->qinfo.qname,
330 qstate->qinfo.qname_len);
332 log_err("memdup failed");
335 mrep_entry = query_info_entrysetup(&qinf, NULL, h);
336 free(qinf.qname); /* if qname 'consumed', it is set to NULL */
338 log_err("query_info_entrysetup failed");
341 lru_entry = &mrep_entry->entry;
342 lru_entry->data = calloc(1,
343 sizeof(struct subnet_msg_cache_data));
344 if (!lru_entry->data) {
345 log_err("malloc failed");
349 /* Step 2, find the correct tree */
350 if (!(tree = get_tree(lru_entry->data, edns, sne, qstate->env->cfg))) {
351 if (acquired_lock) lock_rw_unlock(&lru_entry->lock);
352 log_err("Subnet cache insertion failed");
355 rep = reply_info_copy(qstate->return_msg->rep, &sne->alloc, NULL);
357 if (acquired_lock) lock_rw_unlock(&lru_entry->lock);
358 log_err("Subnet cache insertion failed");
363 for(i=0; i<rep->rrset_count; i++) {
364 rep->ref[i].key = rep->rrsets[i];
365 rep->ref[i].id = rep->rrsets[i]->id;
367 reply_info_set_ttls(rep, *qstate->env->now);
368 rep->flags |= (BIT_RA | BIT_QR); /* fix flags to be sensible for */
369 rep->flags &= ~(BIT_AA | BIT_CD);/* a reply based on the cache */
370 addrtree_insert(tree, (addrkey_t*)edns->subnet_addr,
371 edns->subnet_source_mask,
372 sq->ecs_server_in.subnet_scope_mask, rep,
373 rep->ttl, *qstate->env->now);
375 lock_rw_unlock(&lru_entry->lock);
377 slabhash_insert(subnet_msg_cache, h, lru_entry, lru_entry->data,
382 /** Lookup in cache and reply true iff reply is sent. */
384 lookup_and_reply(struct module_qstate *qstate, int id, struct subnet_qstate *sq)
386 struct lruhash_entry *e;
387 struct module_env *env = qstate->env;
388 struct subnet_env *sne = (struct subnet_env*)env->modinfo[id];
389 hashvalue_type h = query_info_hash(&qstate->qinfo, qstate->query_flags);
390 struct subnet_msg_cache_data *data;
391 struct ecs_data *ecs = &sq->ecs_client_in;
392 struct addrtree *tree;
393 struct addrnode *node;
396 memset(&sq->ecs_client_out, 0, sizeof(sq->ecs_client_out));
398 if (sq) sq->qinfo_hash = h; /* Might be useful on cache miss */
399 e = slabhash_lookup(sne->subnet_msg_cache, h, &qstate->qinfo, 1);
400 if (!e) return 0; /* qinfo not in cache */
402 tree = (ecs->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP4)?
403 data->tree4 : data->tree6;
404 if (!tree) { /* qinfo in cache but not for this family */
405 lock_rw_unlock(&e->lock);
408 node = addrtree_find(tree, (addrkey_t*)ecs->subnet_addr,
409 ecs->subnet_source_mask, *env->now);
410 if (!node) { /* plain old cache miss */
411 lock_rw_unlock(&e->lock);
415 qstate->return_msg = tomsg(NULL, &qstate->qinfo,
416 (struct reply_info *)node->elem, qstate->region, *env->now,
418 scope = (uint8_t)node->scope;
419 lock_rw_unlock(&e->lock);
421 if (!qstate->return_msg) { /* Failed allocation or expired TTL */
425 if (sq->subnet_downstream) { /* relay to interested client */
426 sq->ecs_client_out.subnet_scope_mask = scope;
427 sq->ecs_client_out.subnet_addr_fam = ecs->subnet_addr_fam;
428 sq->ecs_client_out.subnet_source_mask = ecs->subnet_source_mask;
429 memcpy(&sq->ecs_client_out.subnet_addr, &ecs->subnet_addr,
431 sq->ecs_client_out.subnet_validdata = 1;
437 * Test first bits of addresses for equality. Caller is responsible
438 * for making sure that both a and b are at least net/8 octets long.
439 * @param a: first address.
440 * @param a: seconds address.
441 * @param net: Number of bits to test.
442 * @return: 1 if equal, 0 otherwise.
445 common_prefix(uint8_t *a, uint8_t *b, uint8_t net)
447 size_t n = (size_t)net / 8;
448 return !memcmp(a, b, n) && ((net % 8) == 0 || a[n] == b[n]);
451 static enum module_ext_state
452 eval_response(struct module_qstate *qstate, int id, struct subnet_qstate *sq)
454 struct subnet_env *sne = qstate->env->modinfo[id];
456 struct ecs_data *c_in = &sq->ecs_client_in; /* rcvd from client */
457 struct ecs_data *c_out = &sq->ecs_client_out;/* will send to client */
458 struct ecs_data *s_in = &sq->ecs_server_in; /* rcvd from auth */
459 struct ecs_data *s_out = &sq->ecs_server_out;/* sent to auth */
461 memset(c_out, 0, sizeof(*c_out));
463 if (!qstate->return_msg) return module_error;
465 /* We have not asked for subnet data */
466 if (!sq->subnet_sent) {
467 if (s_in->subnet_validdata)
468 verbose(VERB_QUERY, "subnet: received spurious data");
469 if (sq->subnet_downstream) /* Copy back to client */
470 cp_edns_bad_response(c_out, c_in);
471 return module_finished;
474 /* subnet sent but nothing came back */
475 if (!s_in->subnet_validdata) {
476 /* The authority indicated no support for edns subnet. As a
477 * consequence the answer ended up in the regular cache. It
478 * is still usefull to put it in the edns subnet cache for
479 * when a client explicitly asks for subnet specific answer. */
480 verbose(VERB_QUERY, "subnet: Authority indicates no support");
481 lock_rw_wrlock(&sne->biglock);
482 update_cache(qstate, id);
483 lock_rw_unlock(&sne->biglock);
484 if (sq->subnet_downstream)
485 cp_edns_bad_response(c_out, c_in);
486 return module_finished;
489 /* Being here means we have asked for and got a subnet specific
490 * answer. Also, the answer from the authority is not yet cached
493 /* can we accept response? */
494 if(s_out->subnet_addr_fam != s_in->subnet_addr_fam ||
495 s_out->subnet_source_mask != s_in->subnet_source_mask ||
496 !common_prefix(s_out->subnet_addr, s_in->subnet_addr,
497 s_out->subnet_source_mask))
499 /* we can not accept, restart query without option */
500 verbose(VERB_QUERY, "subnet: forged data");
501 s_out->subnet_validdata = 0;
502 (void)edns_opt_list_remove(&qstate->edns_opts_back_out,
503 qstate->env->cfg->client_subnet_opcode);
505 return module_restart_next;
508 lock_rw_wrlock(&sne->biglock);
509 update_cache(qstate, id);
510 lock_rw_unlock(&sne->biglock);
512 if (sq->subnet_downstream) {
513 /* Client wants to see the answer, echo option back
514 * and adjust the scope. */
515 c_out->subnet_addr_fam = c_in->subnet_addr_fam;
516 c_out->subnet_source_mask = c_in->subnet_source_mask;
517 memcpy(&c_out->subnet_addr, &c_in->subnet_addr, INET6_SIZE);
518 c_out->subnet_scope_mask = s_in->subnet_scope_mask;
519 c_out->subnet_validdata = 1;
521 return module_finished;
524 /** Parse EDNS opt data containing ECS */
526 parse_subnet_option(struct edns_option* ecs_option, struct ecs_data* ecs)
528 memset(ecs, 0, sizeof(*ecs));
529 if (ecs_option->opt_len < 4)
532 ecs->subnet_addr_fam = sldns_read_uint16(ecs_option->opt_data);
533 ecs->subnet_source_mask = ecs_option->opt_data[2];
534 ecs->subnet_scope_mask = ecs_option->opt_data[3];
535 /* remaining bytes indicate address */
538 /* option length matches calculated length? */
539 if (ecs_option->opt_len != (size_t)((ecs->subnet_source_mask+7)/8 + 4))
541 if (ecs_option->opt_len - 4 > INET6_SIZE || ecs_option->opt_len == 0)
543 if (ecs->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP4) {
544 if (ecs->subnet_source_mask > 32 || ecs->subnet_scope_mask > 32)
546 } else if (ecs->subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP6) {
547 if (ecs->subnet_source_mask > 128 ||
548 ecs->subnet_scope_mask > 128)
553 /* valid ECS data, write to ecs_data */
554 if (copy_clear(ecs->subnet_addr, INET6_SIZE, ecs_option->opt_data + 4,
555 ecs_option->opt_len - 4, ecs->subnet_source_mask))
557 ecs->subnet_validdata = 1;
562 subnet_option_from_ss(struct sockaddr_storage *ss, struct ecs_data* ecs,
563 struct config_file* cfg)
567 /* Construct subnet option from original query */
568 if(((struct sockaddr_in*)ss)->sin_family == AF_INET) {
569 ecs->subnet_source_mask = cfg->max_client_subnet_ipv4;
570 ecs->subnet_addr_fam = EDNSSUBNET_ADDRFAM_IP4;
571 sinaddr = &((struct sockaddr_in*)ss)->sin_addr;
572 if (!copy_clear( ecs->subnet_addr, INET6_SIZE,
573 (uint8_t *)sinaddr, INET_SIZE,
574 ecs->subnet_source_mask)) {
575 ecs->subnet_validdata = 1;
580 ecs->subnet_source_mask = cfg->max_client_subnet_ipv6;
581 ecs->subnet_addr_fam = EDNSSUBNET_ADDRFAM_IP6;
582 sinaddr = &((struct sockaddr_in6*)ss)->sin6_addr;
583 if (!copy_clear( ecs->subnet_addr, INET6_SIZE,
584 (uint8_t *)sinaddr, INET6_SIZE,
585 ecs->subnet_source_mask)) {
586 ecs->subnet_validdata = 1;
590 /* We don't know how to handle ip6, just pass */
595 ecs_query_response(struct module_qstate* qstate, struct dns_msg* response,
596 int id, void* ATTR_UNUSED(cbargs))
598 struct subnet_qstate *sq;
600 if(!response || !(sq=(struct subnet_qstate*)qstate->minfo[id]))
603 if(sq->subnet_sent &&
604 FLAGS_GET_RCODE(response->rep->flags) == LDNS_RCODE_REFUSED) {
605 /* REFUSED response to ECS query, remove ECS option. */
606 edns_opt_list_remove(&qstate->edns_opts_back_out,
607 qstate->env->cfg->client_subnet_opcode);
609 memset(&sq->ecs_server_out, 0, sizeof(sq->ecs_server_out));
615 ecs_edns_back_parsed(struct module_qstate* qstate, int id,
616 void* ATTR_UNUSED(cbargs))
618 struct subnet_qstate *sq;
619 struct edns_option* ecs_opt;
621 if(!(sq=(struct subnet_qstate*)qstate->minfo[id]))
623 if((ecs_opt = edns_opt_list_find(
624 qstate->edns_opts_back_in,
625 qstate->env->cfg->client_subnet_opcode))) {
626 if(parse_subnet_option(ecs_opt, &sq->ecs_server_in) &&
628 sq->ecs_server_in.subnet_validdata)
629 /* Only skip global cache store if we sent an ECS option
630 * and received one back. Answers from non-whitelisted
631 * servers will end up in global cache. Answers for
632 * queries with 0 source will not (unless nameserver
633 * does not support ECS). */
634 qstate->no_cache_store = 1;
641 subnetmod_operate(struct module_qstate *qstate, enum module_ev event,
642 int id, struct outbound_entry* outbound)
644 struct subnet_env *sne = qstate->env->modinfo[id];
645 struct subnet_qstate *sq = (struct subnet_qstate*)qstate->minfo[id];
647 verbose(VERB_QUERY, "subnet[module %d] operate: extstate:%s "
648 "event:%s", id, strextstate(qstate->ext_state[id]),
649 strmodulevent(event));
650 log_query_info(VERB_QUERY, "subnet operate: query", &qstate->qinfo);
652 if((event == module_event_new || event == module_event_pass) &&
654 struct edns_option* ecs_opt;
655 if(!subnet_new_qstate(qstate, id)) {
656 qstate->return_msg = NULL;
657 qstate->ext_state[id] = module_finished;
661 sq = (struct subnet_qstate*)qstate->minfo[id];
663 if((ecs_opt = edns_opt_list_find(
664 qstate->edns_opts_front_in,
665 qstate->env->cfg->client_subnet_opcode))) {
666 if(!parse_subnet_option(ecs_opt, &sq->ecs_client_in)) {
667 /* Wrongly formatted ECS option. RFC mandates to
668 * return FORMERROR. */
669 qstate->return_rcode = LDNS_RCODE_FORMERR;
670 qstate->ext_state[id] = module_finished;
673 sq->subnet_downstream = 1;
675 else if(qstate->mesh_info->reply_list) {
676 subnet_option_from_ss(
677 &qstate->mesh_info->reply_list->query_reply.addr,
678 &sq->ecs_client_in, qstate->env->cfg);
681 if(sq->ecs_client_in.subnet_validdata == 0) {
682 /* No clients are interested in result or we could not
683 * parse it, we don't do client subnet */
684 sq->ecs_server_out.subnet_validdata = 0;
685 verbose(VERB_ALGO, "subnet: pass to next module");
686 qstate->ext_state[id] = module_wait_module;
690 lock_rw_wrlock(&sne->biglock);
691 if (lookup_and_reply(qstate, id, sq)) {
692 lock_rw_unlock(&sne->biglock);
693 verbose(VERB_QUERY, "subnet: answered from cache");
694 qstate->ext_state[id] = module_finished;
696 ecs_opt_list_append(&sq->ecs_client_out,
697 &qstate->edns_opts_front_out, qstate);
700 lock_rw_unlock(&sne->biglock);
702 sq->ecs_server_out.subnet_addr_fam =
703 sq->ecs_client_in.subnet_addr_fam;
704 sq->ecs_server_out.subnet_source_mask =
705 sq->ecs_client_in.subnet_source_mask;
706 /* Limit source prefix to configured maximum */
707 if(sq->ecs_server_out.subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP4
708 && sq->ecs_server_out.subnet_source_mask >
709 qstate->env->cfg->max_client_subnet_ipv4)
710 sq->ecs_server_out.subnet_source_mask =
711 qstate->env->cfg->max_client_subnet_ipv4;
712 else if(sq->ecs_server_out.subnet_addr_fam == EDNSSUBNET_ADDRFAM_IP6
713 && sq->ecs_server_out.subnet_source_mask >
714 qstate->env->cfg->max_client_subnet_ipv6)
715 sq->ecs_server_out.subnet_source_mask =
716 qstate->env->cfg->max_client_subnet_ipv6;
717 /* Safe to copy completely, even if the source is limited by the
718 * configuration. ecs_opt_list_append() will limit the address.
720 memcpy(&sq->ecs_server_out.subnet_addr,
721 sq->ecs_client_in.subnet_addr, INET6_SIZE);
722 sq->ecs_server_out.subnet_scope_mask = 0;
723 sq->ecs_server_out.subnet_validdata = 1;
724 if(sq->ecs_server_out.subnet_source_mask != 0 &&
725 qstate->env->cfg->client_subnet_always_forward &&
726 sq->subnet_downstream)
727 /* ECS specific data required, do not look at the global
728 * cache in other modules. */
729 qstate->no_cache_lookup = 1;
731 /* pass request to next module */
733 "subnet: not found in cache. pass to next module");
734 qstate->ext_state[id] = module_wait_module;
737 /* Query handed back by next module, we have a 'final' answer */
738 if(sq && event == module_event_moddone) {
739 qstate->ext_state[id] = eval_response(qstate, id, sq);
740 if(qstate->ext_state[id] == module_finished) {
741 ecs_opt_list_append(&sq->ecs_client_out,
742 &qstate->edns_opts_front_out, qstate);
749 /* We are being revisited */
750 if(event == module_event_pass || event == module_event_new) {
751 /* Just pass it on, we already did the work */
752 verbose(VERB_ALGO, "subnet: pass to next module");
753 qstate->ext_state[id] = module_wait_module;
756 if(!sq && (event == module_event_moddone)) {
757 /* during priming, module done but we never started */
758 qstate->ext_state[id] = module_finished;
761 log_err("subnet: bad event %s", strmodulevent(event));
762 qstate->ext_state[id] = module_error;
767 subnetmod_clear(struct module_qstate *ATTR_UNUSED(qstate),
770 /* qstate has no data outside region */
774 subnetmod_inform_super(struct module_qstate *ATTR_UNUSED(qstate),
775 int ATTR_UNUSED(id), struct module_qstate *ATTR_UNUSED(super))
781 subnetmod_get_mem(struct module_env *env, int id)
783 struct subnet_env *sn_env = env->modinfo[id];
784 if (!sn_env) return 0;
785 return sizeof(*sn_env) +
786 slabhash_get_mem(sn_env->subnet_msg_cache) +
787 ecs_whitelist_get_mem(sn_env->whitelist);
791 * The module function block
793 static struct module_func_block subnetmod_block = {
794 "subnet", &subnetmod_init, &subnetmod_deinit, &subnetmod_operate,
795 &subnetmod_inform_super, &subnetmod_clear, &subnetmod_get_mem
798 struct module_func_block*
799 subnetmod_get_funcblock(void)
801 return &subnetmod_block;
804 /** Wrappers for static functions to unit test */
806 unittest_wrapper_subnetmod_sizefunc(void *elemptr)
808 return sizefunc(elemptr);
811 #endif /* CLIENT_SUBNET */