1/** 2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License v2 as published by 6 * the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 */ 14#pragma once 15#include <stdint.h> 16#include <stdbool.h> 17#include <netinet/in.h> 18 19#include "stubs.h" 20 21#define _unused __attribute__((unused)) 22#define _packed __attribute__((packed)) 23 24#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 25 26#define ND_OPT_RECURSIVE_DNS 25 27#define ND_OPT_DNSSL 31 28 29#define DHCPV6_SOL_MAX_RT 120 30#define DHCPV6_REQ_MAX_RT 30 31#define DHCPV6_CNF_MAX_RT 4 32#define DHCPV6_REN_MAX_RT 600 33#define DHCPV6_REB_MAX_RT 600 34#define DHCPV6_INF_MAX_RT 120 35 36#define DEFAULT_MIN_UPDATE_INTERVAL 30 37 38enum dhcvp6_opt { 39 DHCPV6_OPT_CLIENTID = 1, 40 DHCPV6_OPT_SERVERID = 2, 41 DHCPV6_OPT_IA_NA = 3, 42 DHCPV6_OPT_IA_TA = 4, 43 DHCPV6_OPT_IA_ADDR = 5, 44 DHCPV6_OPT_ORO = 6, 45 DHCPV6_OPT_PREF = 7, 46 DHCPV6_OPT_ELAPSED = 8, 47 DHCPV6_OPT_RELAY_MSG = 9, 48 DHCPV6_OPT_AUTH = 11, 49 DHCPV6_OPT_UNICAST = 12, 50 DHCPV6_OPT_STATUS = 13, 51 DHCPV6_OPT_RAPID_COMMIT = 14, 52 DHCPV6_OPT_USER_CLASS = 15, 53 DHCPV6_OPT_VENDOR_CLASS = 16, 54 DHCPV6_OPT_RECONF_MESSAGE = 19, 55 DHCPV6_OPT_RECONF_ACCEPT = 20, 56 DHCPV6_OPT_DNS_SERVERS = 23, 57 DHCPV6_OPT_DNS_DOMAIN = 24, 58 DHCPV6_OPT_IA_PD = 25, 59 DHCPV6_OPT_IA_PREFIX = 26, 60 DHCPV6_OPT_SNTP_SERVERS = 31, 61 DHCPV6_OPT_INFO_REFRESH = 32, 62 DHCPV6_OPT_FQDN = 39, 63 DHCPV6_OPT_NTP_SERVER = 56, 64 DHCPV6_OPT_SIP_SERVER_D = 21, 65 DHCPV6_OPT_SIP_SERVER_A = 22, 66 DHCPV6_OPT_AFTR_NAME = 64, 67 DHCPV6_OPT_PD_EXCLUDE = 67, 68 DHCPV6_OPT_SOL_MAX_RT = 82, 69 DHCPV6_OPT_INF_MAX_RT = 83, 70#ifdef EXT_CER_ID 71 /* draft-donley-dhc-cer-id-option-03 */ 72 DHCPV6_OPT_CER_ID = EXT_CER_ID, 73#endif 74 /* draft-ietf-softwire-map-dhcp-08 */ 75 DHCPV6_OPT_S46_RULE = 89, 76 DHCPV6_OPT_S46_BR = 90, 77 DHCPV6_OPT_S46_DMR = 91, 78 DHCPV6_OPT_S46_V4V6BIND = 92, 79 DHCPV6_OPT_S46_PORTPARAMS = 93, 80 DHCPV6_OPT_S46_CONT_MAPE = 94, 81 DHCPV6_OPT_S46_CONT_MAPT = 95, 82 DHCPV6_OPT_S46_CONT_LW = 96, 83}; 84 85enum dhcpv6_opt_npt { 86 NTP_SRV_ADDR = 1, 87 NTP_MC_ADDR = 2, 88 NTP_SRV_FQDN = 3 89}; 90 91enum dhcpv6_msg { 92 DHCPV6_MSG_UNKNOWN = 0, 93 DHCPV6_MSG_SOLICIT = 1, 94 DHCPV6_MSG_ADVERT = 2, 95 DHCPV6_MSG_REQUEST = 3, 96 DHCPV6_MSG_RENEW = 5, 97 DHCPV6_MSG_REBIND = 6, 98 DHCPV6_MSG_REPLY = 7, 99 DHCPV6_MSG_RELEASE = 8, 100 DHCPV6_MSG_DECLINE = 9, 101 DHCPV6_MSG_RECONF = 10, 102 DHCPV6_MSG_INFO_REQ = 11, 103 _DHCPV6_MSG_MAX 104}; 105 106enum dhcpv6_status { 107 DHCPV6_Success = 0, 108 DHCPV6_UnspecFail = 1, 109 DHCPV6_NoAddrsAvail = 2, 110 DHCPV6_NoBinding = 3, 111 DHCPV6_NotOnLink = 4, 112 DHCPV6_UseMulticast = 5, 113 DHCPV6_NoPrefixAvail = 6, 114 _DHCPV6_Status_Max 115}; 116 117enum dhcpv6_config { 118 DHCPV6_STRICT_OPTIONS = 1, 119 DHCPV6_CLIENT_FQDN = 2, 120 DHCPV6_ACCEPT_RECONFIGURE = 4, 121}; 122 123typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc, 124 const void *opt, const void *end, const struct sockaddr_in6 *from); 125 126// retransmission strategy 127struct dhcpv6_retx { 128 bool delay; 129 uint8_t init_timeo; 130 uint16_t max_timeo; 131 uint8_t max_rc; 132 char name[8]; 133 reply_handler *handler_reply; 134 int(*handler_finish)(void); 135}; 136 137// DHCPv6 Protocol Headers 138struct dhcpv6_header { 139 uint8_t msg_type; 140 uint8_t tr_id[3]; 141} __attribute__((packed)); 142 143struct dhcpv6_ia_hdr { 144 uint16_t type; 145 uint16_t len; 146 uint32_t iaid; 147 uint32_t t1; 148 uint32_t t2; 149} _packed; 150 151struct dhcpv6_ia_addr { 152 uint16_t type; 153 uint16_t len; 154 struct in6_addr addr; 155 uint32_t preferred; 156 uint32_t valid; 157} _packed; 158 159struct dhcpv6_ia_prefix { 160 uint16_t type; 161 uint16_t len; 162 uint32_t preferred; 163 uint32_t valid; 164 uint8_t prefix; 165 struct in6_addr addr; 166} _packed; 167 168struct dhcpv6_duid { 169 uint16_t type; 170 uint16_t len; 171 uint16_t duid_type; 172 uint8_t data[128]; 173} _packed; 174 175struct dhcpv6_auth_reconfigure { 176 uint16_t type; 177 uint16_t len; 178 uint8_t protocol; 179 uint8_t algorithm; 180 uint8_t rdm; 181 uint64_t replay; 182 uint8_t reconf_type; 183 uint8_t key[16]; 184} _packed; 185 186struct dhcpv6_cer_id { 187 uint16_t type; 188 uint16_t len; 189 struct in6_addr addr; 190} _packed; 191 192struct dhcpv6_s46_portparams { 193 uint8_t offset; 194 uint8_t psid_len; 195 uint16_t psid; 196} _packed; 197 198struct dhcpv6_s46_v4v6bind { 199 struct in_addr ipv4_address; 200 uint8_t bindprefix6_len; 201 uint8_t bind_ipv6_prefix[]; 202} _packed; 203 204struct dhcpv6_s46_dmr { 205 uint8_t dmr_prefix6_len; 206 uint8_t dmr_ipv6_prefix[]; 207} _packed; 208 209struct dhcpv6_s46_rule { 210 uint8_t flags; 211 uint8_t ea_len; 212 uint8_t prefix4_len; 213 struct in_addr ipv4_prefix; 214 uint8_t prefix6_len; 215 uint8_t ipv6_prefix[]; 216} _packed; 217 218#define dhcpv6_for_each_option(start, end, otype, olen, odata)\ 219 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\ 220 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\ 221 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \ 222 _o += 4 + (_o[2] << 8 | _o[3])) 223 224 225struct dhcpv6_server_cand { 226 bool has_noaddravail; 227 bool wants_reconfigure; 228 int16_t preference; 229 uint8_t duid_len; 230 uint8_t duid[130]; 231 uint32_t sol_max_rt; 232 uint32_t inf_max_rt; 233 void *ia_na; 234 void *ia_pd; 235 size_t ia_na_len; 236 size_t ia_pd_len; 237}; 238 239 240enum odhcp6c_state { 241 STATE_CLIENT_ID, 242 STATE_SERVER_ID, 243 STATE_SERVER_CAND, 244 STATE_SERVER_ADDR, 245 STATE_ORO, 246 STATE_DNS, 247 STATE_SEARCH, 248 STATE_IA_NA, 249 STATE_IA_PD, 250 STATE_IA_PD_INIT, 251 STATE_CUSTOM_OPTS, 252 STATE_SNTP_IP, 253 STATE_NTP_IP, 254 STATE_NTP_FQDN, 255 STATE_SIP_IP, 256 STATE_SIP_FQDN, 257 STATE_RA_ROUTE, 258 STATE_RA_PREFIX, 259 STATE_RA_DNS, 260 STATE_RA_SEARCH, 261 STATE_AFTR_NAME, 262 STATE_VENDORCLASS, 263 STATE_USERCLASS, 264 STATE_CER, 265 STATE_S46_MAPT, 266 STATE_S46_MAPE, 267 STATE_S46_LW, 268 STATE_PASSTHRU, 269 _STATE_MAX 270}; 271 272 273struct icmp6_opt { 274 uint8_t type; 275 uint8_t len; 276 uint8_t data[6]; 277}; 278 279 280enum dhcpv6_mode { 281 DHCPV6_UNKNOWN = -1, 282 DHCPV6_STATELESS, 283 DHCPV6_STATEFUL 284}; 285 286enum odhcp6c_ia_mode { 287 IA_MODE_NONE, 288 IA_MODE_TRY, 289 IA_MODE_FORCE, 290}; 291 292 293struct odhcp6c_entry { 294 struct in6_addr router; 295 uint8_t auxlen; 296 uint8_t length; 297 int16_t priority; 298 struct in6_addr target; 299 uint32_t valid; 300 uint32_t preferred; 301 uint32_t t1; 302 uint32_t t2; 303 uint32_t iaid; 304 uint8_t auxtarget[]; 305}; 306 307struct odhcp6c_request_prefix { 308 uint32_t iaid; 309 uint16_t length; 310}; 311 312int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout); 313int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd); 314int dhcpv6_request(enum dhcpv6_msg type); 315int dhcpv6_poll_reconfigure(void); 316int dhcpv6_promote_server_cand(void); 317 318int init_rtnetlink(void); 319int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr, 320 uint32_t pref, uint32_t valid); 321 322int ra_conf_hoplimit(int newvalue); 323int ra_conf_mtu(int newvalue); 324int ra_conf_reachable(int newvalue); 325int ra_conf_retransmit(int newvalue); 326 327int script_init(const char *path, const char *ifname); 328ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src); 329void script_call(const char *status, int delay, bool resume); 330 331bool odhcp6c_signal_process(void); 332uint64_t odhcp6c_get_milli_time(void); 333int odhcp6c_random(void *buf, size_t len); 334bool odhcp6c_is_bound(void); 335 336// State manipulation 337void odhcp6c_clear_state(enum odhcp6c_state state); 338void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len); 339void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len); 340int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len); 341size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len); 342void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len); 343void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len); 344 345// Entry manipulation 346bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, bool filterexcess); 347 348void odhcp6c_expire(void); 349uint32_t odhcp6c_elapsed(void); 350