2 * edns-subnet/subnetmod.h - edns subnet module. Must be called before validator
5 * Copyright (c) 2013, NLnet Labs. All rights reserved.
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38 * subnet module for unbound.
43 #include "util/module.h"
44 #include "services/outbound_list.h"
45 #include "util/alloc.h"
46 #include "util/net_help.h"
47 #include "util/storage/slabhash.h"
48 #include "edns-subnet/addrtree.h"
49 #include "edns-subnet/edns-subnet.h"
52 * Global state for the subnet module.
55 /** shared message cache
56 * key: struct query_info*
57 * data: struct subnet_msg_cache_data* */
58 struct slabhash* subnet_msg_cache;
59 /** access control, which upstream servers we send client address */
60 struct ecs_whitelist* whitelist;
61 /** allocation service */
62 struct alloc_cache alloc;
64 /** number of messages from cache */
66 /** number of messages not from cache */
67 size_t num_msg_nocache;
70 struct subnet_msg_cache_data {
71 struct addrtree* tree4;
72 struct addrtree* tree6;
75 struct subnet_qstate {
76 /** We need the hash for both cache lookup and insert */
77 hashvalue_type qinfo_hash;
78 /** ecs_data for client communication */
79 struct ecs_data ecs_client_in;
80 struct ecs_data ecs_client_out;
81 /** ecss data for server communication */
82 struct ecs_data ecs_server_in;
83 struct ecs_data ecs_server_out;
84 int subnet_downstream;
86 /** has the subnet module been started with no_cache_store? */
87 int started_no_cache_store;
90 void subnet_data_delete(void* d, void* ATTR_UNUSED(arg));
91 size_t msg_cache_sizefunc(void* k, void* d);
94 * Get the module function block.
95 * @return: function block with function pointers to module methods.
97 struct module_func_block* subnetmod_get_funcblock(void);
99 /** subnet module init */
100 int subnetmod_init(struct module_env* env, int id);
102 /** subnet module deinit */
103 void subnetmod_deinit(struct module_env* env, int id);
105 /** subnet module operate on a query */
106 void subnetmod_operate(struct module_qstate* qstate, enum module_ev event,
107 int id, struct outbound_entry* outbound);
110 void subnetmod_inform_super(struct module_qstate* qstate, int id,
111 struct module_qstate* super);
113 /** subnet module cleanup query state */
114 void subnetmod_clear(struct module_qstate* qstate, int id);
116 /** subnet module alloc size routine */
117 size_t subnetmod_get_mem(struct module_env* env, int id);
119 /** Wrappers for static functions to unit test */
120 size_t unittest_wrapper_subnetmod_sizefunc(void *elemptr);
122 /** Whitelist check, called just before query is sent upstream. */
123 int ecs_whitelist_check(struct query_info* qinfo, uint16_t flags,
124 struct module_qstate* qstate, struct sockaddr_storage* addr,
125 socklen_t addrlen, uint8_t* zone, size_t zonelen,
126 struct regional* region, int id, void* cbargs);
128 /** Check whether response from server contains ECS record, if so, skip cache
129 * store. Called just after parsing EDNS data from server. */
130 int ecs_edns_back_parsed(struct module_qstate* qstate, int id, void* cbargs);
132 /** Remove ECS record from back_out when query resulted in REFUSED response. */
133 int ecs_query_response(struct module_qstate* qstate, struct dns_msg* response,
134 int id, void* cbargs);
136 /** mark subnet msg to be deleted */
137 void subnet_markdel(void* key);
139 #endif /* SUBNETMOD_H */