src/odhcp6c.h

   1 /**
   2  * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
   3  * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License v2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15 #pragma once
  16 #include <stdint.h>
  17 #include <stdbool.h>
  18 #include <netinet/in.h>
  19
  20 #define _unused __attribute__((unused))
  21 #define _packed __attribute__((packed))
  22 #define _aligned(n) __attribute__((aligned(n)))
  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 RA_MIN_ADV_INTERVAL 3   /* RFC 4861 paragraph 6.2.1 */
  37
  38 enum 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_INTERFACE_ID = 18,
  55         DHCPV6_OPT_RECONF_MESSAGE = 19,
  56         DHCPV6_OPT_RECONF_ACCEPT = 20,
  57         DHCPV6_OPT_SIP_SERVER_D = 21,
  58         DHCPV6_OPT_SIP_SERVER_A = 22,
  59         DHCPV6_OPT_DNS_SERVERS = 23,
  60         DHCPV6_OPT_DNS_DOMAIN = 24,
  61         DHCPV6_OPT_IA_PD = 25,
  62         DHCPV6_OPT_IA_PREFIX = 26,
  63         DHCPV6_OPT_SNTP_SERVERS = 31,
  64         DHCPV6_OPT_INFO_REFRESH = 32,
  65         DHCPV6_OPT_REMOTE_ID = 37,
  66         DHCPV6_OPT_SUBSCRIBER_ID = 38,
  67         DHCPV6_OPT_FQDN = 39,
  68         DHCPV6_OPT_ERO = 43,
  69         DHCPV6_OPT_LQ_QUERY = 44,
  70         DHCPV6_OPT_CLIENT_DATA = 45,
  71         DHCPV6_OPT_CLT_TIME = 46,
  72         DHCPV6_OPT_LQ_RELAY_DATA = 47,
  73         DHCPV6_OPT_LQ_CLIENT_LINK = 48,
  74         DHCPV6_OPT_RELAY_ID = 53,
  75         DHCPV6_OPT_NTP_SERVER = 56,
  76         DHCPV6_OPT_CLIENT_ARCH_TYPE = 61,
  77         DHCPV6_OPT_AFTR_NAME = 64,
  78         DHCPV6_OPT_RSOO = 66,
  79         DHCPV6_OPT_PD_EXCLUDE = 67,
  80         DHCPV6_OPT_VSS = 68,
  81         DHCPV6_OPT_LINK_LAYER_ADDRESS = 79,
  82         DHCPV6_OPT_LINK_ADDRESS = 80,
  83         DHCPV6_OPT_RADIUS = 81,
  84         DHCPV6_OPT_SOL_MAX_RT = 82,
  85         DHCPV6_OPT_INF_MAX_RT = 83,
  86 #ifdef EXT_CER_ID
  87         /* draft-donley-dhc-cer-id-option-03 */
  88         DHCPV6_OPT_CER_ID = EXT_CER_ID,
  89 #endif
  90         DHCPV6_OPT_DHCPV4_MSG = 87,
  91         /* draft-ietf-softwire-map-dhcp-08 */
  92         DHCPV6_OPT_S46_RULE = 89,
  93         DHCPV6_OPT_S46_BR = 90,
  94         DHCPV6_OPT_S46_DMR = 91,
  95         DHCPV6_OPT_S46_V4V6BIND = 92,
  96         DHCPV6_OPT_S46_PORTPARAMS = 93,
  97         DHCPV6_OPT_S46_CONT_MAPE = 94,
  98         DHCPV6_OPT_S46_CONT_MAPT = 95,
  99         DHCPV6_OPT_S46_CONT_LW = 96,
 100         DHCPV6_OPT_LQ_BASE_TIME = 100,
 101         DHCPV6_OPT_LQ_START_TIME = 101,
 102         DHCPV6_OPT_LQ_END_TIME = 102,
 103         DHCPV6_OPT_ANI_ATT = 105,
 104         DHCPV6_OPT_ANI_NETWORK_NAME = 106,
 105         DHCPV6_OPT_ANI_AP_NAME = 107,
 106         DHCPV6_OPT_ANI_AP_BSSID = 108,
 107         DHCPV6_OPT_ANI_OPERATOR_ID = 109,
 108         DHCPV6_OPT_ANI_OPERATOR_REALM = 110,
 109         DHCPV6_OPT_MUD_URL_V6 = 112,
 110         DHCPV6_OPT_F_BINDING_STATUS = 114,
 111         DHCPV6_OPT_F_CONNECT_FLAGS = 115,
 112         DHCPV6_OPT_F_DNS_REMOVAL_INFO = 116,
 113         DHCPV6_OPT_F_DNS_HOST_NAME = 117,
 114         DHCPV6_OPT_F_DNS_ZONE_NAME = 118,
 115         DHCPV6_OPT_F_DNS_FLAGS = 119,
 116         DHCPV6_OPT_F_EXPIRATION_TIME = 120,
 117         DHCPV6_OPT_F_MAX_UNACKED_BNDUPD = 121,
 118         DHCPV6_OPT_F_MCLT = 122,
 119         DHCPV6_OPT_F_PARTNER_LIFETIME = 123,
 120         DHCPV6_OPT_F_PARTNER_LIFETIME_SENT = 124,
 121         DHCPV6_OPT_F_PARTNER_DOWN_TIME = 125,
 122         DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME = 126,
 123         DHCPV6_OPT_F_PROTOCOL_VERSION = 127,
 124         DHCPV6_OPT_F_KEEPALIVE_TIME = 128,
 125         DHCPV6_OPT_F_RECONFIGURE_DATA = 129,
 126         DHCPV6_OPT_F_RELATIONSHIP_NAME = 130,
 127         DHCPV6_OPT_F_SERVER_FLAGS = 131,
 128         DHCPV6_OPT_F_SERVER_STATE = 132,
 129         DHCPV6_OPT_F_START_TIME_OF_STATE = 133,
 130         DHCPV6_OPT_F_STATE_EXPIRATION_TIME  = 134,
 131         DHCPV6_OPT_RELAY_PORT = 135,
 132 };
 133
 134 enum dhcpv6_opt_npt {
 135         NTP_SRV_ADDR = 1,
 136         NTP_MC_ADDR = 2,
 137         NTP_SRV_FQDN = 3
 138 };
 139
 140 enum dhcpv6_msg {
 141         DHCPV6_MSG_UNKNOWN = 0,
 142         DHCPV6_MSG_SOLICIT = 1,
 143         DHCPV6_MSG_ADVERT = 2,
 144         DHCPV6_MSG_REQUEST = 3,
 145         DHCPV6_MSG_RENEW = 5,
 146         DHCPV6_MSG_REBIND = 6,
 147         DHCPV6_MSG_REPLY = 7,
 148         DHCPV6_MSG_RELEASE = 8,
 149         DHCPV6_MSG_DECLINE = 9,
 150         DHCPV6_MSG_RECONF = 10,
 151         DHCPV6_MSG_INFO_REQ = 11,
 152         _DHCPV6_MSG_MAX
 153 };
 154
 155 enum dhcpv6_status {
 156         DHCPV6_Success = 0,
 157         DHCPV6_UnspecFail = 1,
 158         DHCPV6_NoAddrsAvail = 2,
 159         DHCPV6_NoBinding = 3,
 160         DHCPV6_NotOnLink = 4,
 161         DHCPV6_UseMulticast = 5,
 162         DHCPV6_NoPrefixAvail = 6,
 163         _DHCPV6_Status_Max
 164 };
 165
 166 enum dhcpv6_config {
 167         DHCPV6_STRICT_OPTIONS = 1,
 168         DHCPV6_CLIENT_FQDN = 2,
 169         DHCPV6_ACCEPT_RECONFIGURE = 4,
 170         DHCPV6_IGNORE_OPT_UNICAST = 8,
 171 };
 172
 173 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
 174                 const void *opt, const void *end, const struct sockaddr_in6 *from);
 175
 176 // retransmission strategy
 177 struct dhcpv6_retx {
 178         bool delay;
 179         uint8_t init_timeo;
 180         uint16_t max_timeo;
 181         uint8_t max_rc;
 182         char name[8];
 183         reply_handler *handler_reply;
 184         int(*handler_finish)(void);
 185 };
 186
 187 // DHCPv6 Protocol Headers
 188 struct dhcpv6_header {
 189         uint8_t msg_type;
 190         uint8_t tr_id[3];
 191 } __attribute__((packed));
 192
 193 struct dhcpv6_ia_hdr {
 194         uint16_t type;
 195         uint16_t len;
 196         uint32_t iaid;
 197         uint32_t t1;
 198         uint32_t t2;
 199 } _packed;
 200
 201 struct dhcpv6_ia_addr {
 202         uint16_t type;
 203         uint16_t len;
 204         struct in6_addr addr;
 205         uint32_t preferred;
 206         uint32_t valid;
 207 } _packed;
 208
 209 struct dhcpv6_ia_prefix {
 210         uint16_t type;
 211         uint16_t len;
 212         uint32_t preferred;
 213         uint32_t valid;
 214         uint8_t prefix;
 215         struct in6_addr addr;
 216 } _packed;
 217
 218 struct dhcpv6_duid {
 219         uint16_t type;
 220         uint16_t len;
 221         uint16_t duid_type;
 222         uint8_t data[128];
 223 } _packed;
 224
 225 struct dhcpv6_auth_reconfigure {
 226         uint16_t type;
 227         uint16_t len;
 228         uint8_t protocol;
 229         uint8_t algorithm;
 230         uint8_t rdm;
 231         uint64_t replay;
 232         uint8_t reconf_type;
 233         uint8_t key[16];
 234 } _packed;
 235
 236 struct dhcpv6_cer_id {
 237         uint16_t type;
 238         uint16_t len;
 239         struct in6_addr addr;
 240 } _packed;
 241
 242 struct dhcpv6_s46_portparams {
 243         uint8_t offset;
 244         uint8_t psid_len;
 245         uint16_t psid;
 246 } _packed;
 247
 248 struct dhcpv6_s46_v4v6bind {
 249         struct in_addr ipv4_address;
 250         uint8_t bindprefix6_len;
 251         uint8_t bind_ipv6_prefix[];
 252 } _packed;
 253
 254 struct dhcpv6_s46_dmr {
 255         uint8_t dmr_prefix6_len;
 256         uint8_t dmr_ipv6_prefix[];
 257 } _packed;
 258
 259 struct dhcpv6_s46_rule {
 260         uint8_t flags;
 261         uint8_t ea_len;
 262         uint8_t prefix4_len;
 263         struct in_addr ipv4_prefix;
 264         uint8_t prefix6_len;
 265         uint8_t ipv6_prefix[];
 266 } _packed;
 267
 268 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 269         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 270                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 271                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 272                 _o += 4 + (_o[2] << 8 | _o[3]))
 273
 274
 275 struct dhcpv6_server_cand {
 276         bool has_noaddravail;
 277         bool wants_reconfigure;
 278         int16_t preference;
 279         uint8_t duid_len;
 280         uint8_t duid[130];
 281         struct in6_addr server_addr;
 282         uint32_t sol_max_rt;
 283         uint32_t inf_max_rt;
 284         void *ia_na;
 285         void *ia_pd;
 286         size_t ia_na_len;
 287         size_t ia_pd_len;
 288 };
 289
 290
 291 enum odhcp6c_state {
 292         STATE_CLIENT_ID,
 293         STATE_SERVER_ID,
 294         STATE_SERVER_CAND,
 295         STATE_SERVER_ADDR,
 296         STATE_ORO,
 297         STATE_DNS,
 298         STATE_SEARCH,
 299         STATE_IA_NA,
 300         STATE_IA_PD,
 301         STATE_IA_PD_INIT,
 302         STATE_CUSTOM_OPTS,
 303         STATE_SNTP_IP,
 304         STATE_NTP_IP,
 305         STATE_NTP_FQDN,
 306         STATE_SIP_IP,
 307         STATE_SIP_FQDN,
 308         STATE_RA_ROUTE,
 309         STATE_RA_PREFIX,
 310         STATE_RA_DNS,
 311         STATE_RA_SEARCH,
 312         STATE_AFTR_NAME,
 313         STATE_OPTS,
 314         STATE_CER,
 315         STATE_S46_MAPT,
 316         STATE_S46_MAPE,
 317         STATE_S46_LW,
 318         STATE_PASSTHRU,
 319         _STATE_MAX
 320 };
 321
 322 struct icmp6_opt {
 323         uint8_t type;
 324         uint8_t len;
 325         uint8_t data[6];
 326 };
 327
 328
 329 enum dhcpv6_mode {
 330         DHCPV6_UNKNOWN = -1,
 331         DHCPV6_STATELESS,
 332         DHCPV6_STATEFUL
 333 };
 334
 335 enum ra_config {
 336         RA_RDNSS_DEFAULT_LIFETIME = 1,
 337 };
 338
 339 enum odhcp6c_ia_mode {
 340         IA_MODE_NONE,
 341         IA_MODE_TRY,
 342         IA_MODE_FORCE,
 343 };
 344
 345
 346 struct odhcp6c_entry {
 347         struct in6_addr router;
 348         uint8_t auxlen;
 349         uint8_t length;
 350         struct in6_addr target;
 351         int16_t priority;
 352         uint32_t valid;
 353         uint32_t preferred;
 354         uint32_t t1;
 355         uint32_t t2;
 356         uint32_t iaid;
 357         uint8_t auxtarget[];
 358 };
 359
 360 // Include padding after auxtarget to align the next entry
 361 #define odhcp6c_entry_size(entry) \
 362         (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
 363
 364 #define odhcp6c_next_entry(entry) \
 365         ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
 366
 367
 368 struct odhcp6c_request_prefix {
 369         uint32_t iaid;
 370         uint16_t length;
 371 };
 372
 373 enum odhcp6c_opt_flags {
 374         OPT_U8 = 0,
 375         OPT_IP6,
 376         OPT_STR,
 377         OPT_DNS_STR,
 378         OPT_USER_CLASS,
 379         OPT_MASK_SIZE = 0x0F,
 380         OPT_ARRAY = 0x10,
 381         OPT_INTERNAL = 0x20,
 382         OPT_NO_PASSTHRU = 0x40,
 383         OPT_ORO = 0x80,
 384         OPT_ORO_STATEFUL = 0x100,
 385         OPT_ORO_STATELESS = 0x200,
 386         OPT_ORO_SOLICIT = 0x400
 387 };
 388
 389 struct odhcp6c_opt {
 390         uint16_t code;
 391         uint16_t flags;
 392         const char *str;
 393 };
 394
 395 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
 396 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd, bool stateful_only);
 397 int dhcpv6_request(enum dhcpv6_msg type);
 398 int dhcpv6_poll_reconfigure(void);
 399 int dhcpv6_promote_server_cand(void);
 400
 401 int init_rtnetlink(void);
 402 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 403                 uint32_t pref, uint32_t valid);
 404
 405 int ra_get_hoplimit(void);
 406 int ra_get_mtu(void);
 407 int ra_get_reachable(void);
 408 int ra_get_retransmit(void);
 409
 410 int script_init(const char *path, const char *ifname);
 411 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 412 void script_call(const char *status, int delay, bool resume);
 413
 414 bool odhcp6c_signal_process(void);
 415 uint64_t odhcp6c_get_milli_time(void);
 416 int odhcp6c_random(void *buf, size_t len);
 417 bool odhcp6c_is_bound(void);
 418 bool odhcp6c_addr_in_scope(const struct in6_addr *addr);
 419
 420 // State manipulation
 421 void odhcp6c_clear_state(enum odhcp6c_state state);
 422 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 423 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
 424 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
 425 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 426 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 427 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 428
 429 // Entry manipulation
 430 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
 431                                 uint32_t safe, unsigned int holdoff_interval);
 432
 433 void odhcp6c_expire(bool expire_ia_pd);
 434 uint32_t odhcp6c_elapsed(void);
 435 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code);