1 /* 2 * util/edns.h - handle base EDNS options. 3 * 4 * Copyright (c) 2018, NLnet Labs. All rights reserved. 5 * 6 * This software is open source. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * 15 * Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * Neither the name of the NLNET LABS nor the names of its contributors may 20 * be used to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 27 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 29 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /** 37 * \file 38 * 39 * This file contains functions for base EDNS options. 40 */ 41 42 #ifndef UTIL_EDNS_H 43 #define UTIL_EDNS_H 44 45 #include "util/storage/dnstree.h" 46 47 struct edns_data; 48 struct config_file; 49 struct comm_point; 50 struct regional; 51 52 /** 53 * Structure containing all EDNS tags. 54 */ 55 struct edns_tags { 56 /** Tree of EDNS client tags to use in upstream queries, per address 57 * prefix. Contains nodes of type edns_tag_addr. */ 58 rbtree_type client_tags; 59 /** EDNS opcode to use for client tags */ 60 uint16_t client_tag_opcode; 61 /** region to allocate tree nodes in */ 62 struct regional* region; 63 }; 64 65 /** 66 * EDNS tag. Node of rbtree, containing tag and prefix. 67 */ 68 struct edns_tag_addr { 69 /** node in address tree, used for tree lookups. Need to be the first 70 * member of this struct. */ 71 struct addr_tree_node node; 72 /** tag data, in host byte ordering */ 73 uint16_t tag_data; 74 }; 75 76 /** 77 * Create structure to hold EDNS tags 78 * @return: newly created edns_tags, NULL on alloc failure. 79 */ 80 struct edns_tags* edns_tags_create(void); 81 82 /** Delete EDNS tags structure 83 * @param edns_tags: struct to delete 84 */ 85 void edns_tags_delete(struct edns_tags* edns_tags); 86 87 /** 88 * Add configured EDNS tags 89 * @param edns_tags: edns tags to apply config to 90 * @param config: struct containing EDNS tags configuration 91 * @return 0 on error 92 */ 93 int edns_tags_apply_cfg(struct edns_tags* edns_tags, 94 struct config_file* config); 95 96 /** 97 * Find tag for address. 98 * @param tree: tree containing EDNS tags per address prefix. 99 * @param addr: address to use for tree lookup 100 * @param addrlen: length of address 101 * @return: matching tree node, NULL otherwise 102 */ 103 struct edns_tag_addr* 104 edns_tag_addr_lookup(rbtree_type* tree, struct sockaddr_storage* addr, 105 socklen_t addrlen); 106 107 /** 108 * Apply common EDNS options. 109 * 110 * @param edns_out: initialised edns information with outbound edns. 111 * @param edns_in: initialised edns information with received edns. 112 * @param cfg: configuration. 113 * @param c: comm channel. 114 * @param region: the region to allocate the edns options in. 115 */ 116 int apply_edns_options(struct edns_data* edns_out, struct edns_data* edns_in, 117 struct config_file* cfg, struct comm_point* c, struct regional* region); 118 119 #endif 120