src/odhcp6c.h

   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 #define _unused __attribute__((unused))
  20 #define _packed __attribute__((packed))
  21 #define _aligned(n) __attribute__((aligned(n)))
  22
  23 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  24
  25 #define ND_OPT_RECURSIVE_DNS 25
  26 #define ND_OPT_DNSSL 31
  27
  28 #define DHCPV6_SOL_MAX_RT 120
  29 #define DHCPV6_REQ_MAX_RT 30
  30 #define DHCPV6_CNF_MAX_RT 4
  31 #define DHCPV6_REN_MAX_RT 600
  32 #define DHCPV6_REB_MAX_RT 600
  33 #define DHCPV6_INF_MAX_RT 120
  34
  35 #define DEFAULT_MIN_UPDATE_INTERVAL 30
  36
  37 enum dhcvp6_opt {
  38         DHCPV6_OPT_CLIENTID = 1,
  39         DHCPV6_OPT_SERVERID = 2,
  40         DHCPV6_OPT_IA_NA = 3,
  41         DHCPV6_OPT_IA_TA = 4,
  42         DHCPV6_OPT_IA_ADDR = 5,
  43         DHCPV6_OPT_ORO = 6,
  44         DHCPV6_OPT_PREF = 7,
  45         DHCPV6_OPT_ELAPSED = 8,
  46         DHCPV6_OPT_RELAY_MSG = 9,
  47         DHCPV6_OPT_AUTH = 11,
  48         DHCPV6_OPT_UNICAST = 12,
  49         DHCPV6_OPT_STATUS = 13,
  50         DHCPV6_OPT_RAPID_COMMIT = 14,
  51         DHCPV6_OPT_USER_CLASS = 15,
  52         DHCPV6_OPT_VENDOR_CLASS = 16,
  53         DHCPV6_OPT_RECONF_MESSAGE = 19,
  54         DHCPV6_OPT_RECONF_ACCEPT = 20,
  55         DHCPV6_OPT_DNS_SERVERS = 23,
  56         DHCPV6_OPT_DNS_DOMAIN = 24,
  57         DHCPV6_OPT_IA_PD = 25,
  58         DHCPV6_OPT_IA_PREFIX = 26,
  59         DHCPV6_OPT_SNTP_SERVERS = 31,
  60         DHCPV6_OPT_INFO_REFRESH = 32,
  61         DHCPV6_OPT_FQDN = 39,
  62         DHCPV6_OPT_NTP_SERVER = 56,
  63         DHCPV6_OPT_SIP_SERVER_D = 21,
  64         DHCPV6_OPT_SIP_SERVER_A = 22,
  65         DHCPV6_OPT_AFTR_NAME = 64,
  66         DHCPV6_OPT_PD_EXCLUDE = 67,
  67         DHCPV6_OPT_SOL_MAX_RT = 82,
  68         DHCPV6_OPT_INF_MAX_RT = 83,
  69 #ifdef EXT_CER_ID
  70         /* draft-donley-dhc-cer-id-option-03 */
  71         DHCPV6_OPT_CER_ID = EXT_CER_ID,
  72 #endif
  73         /* draft-ietf-softwire-map-dhcp-08 */
  74         DHCPV6_OPT_S46_RULE = 89,
  75         DHCPV6_OPT_S46_BR = 90,
  76         DHCPV6_OPT_S46_DMR = 91,
  77         DHCPV6_OPT_S46_V4V6BIND = 92,
  78         DHCPV6_OPT_S46_PORTPARAMS = 93,
  79         DHCPV6_OPT_S46_CONT_MAPE = 94,
  80         DHCPV6_OPT_S46_CONT_MAPT = 95,
  81         DHCPV6_OPT_S46_CONT_LW = 96,
  82 };
  83
  84 enum dhcpv6_opt_npt {
  85         NTP_SRV_ADDR = 1,
  86         NTP_MC_ADDR = 2,
  87         NTP_SRV_FQDN = 3
  88 };
  89
  90 enum dhcpv6_msg {
  91         DHCPV6_MSG_UNKNOWN = 0,
  92         DHCPV6_MSG_SOLICIT = 1,
  93         DHCPV6_MSG_ADVERT = 2,
  94         DHCPV6_MSG_REQUEST = 3,
  95         DHCPV6_MSG_RENEW = 5,
  96         DHCPV6_MSG_REBIND = 6,
  97         DHCPV6_MSG_REPLY = 7,
  98         DHCPV6_MSG_RELEASE = 8,
  99         DHCPV6_MSG_DECLINE = 9,
 100         DHCPV6_MSG_RECONF = 10,
 101         DHCPV6_MSG_INFO_REQ = 11,
 102         _DHCPV6_MSG_MAX
 103 };
 104
 105 enum dhcpv6_status {
 106         DHCPV6_Success = 0,
 107         DHCPV6_UnspecFail = 1,
 108         DHCPV6_NoAddrsAvail = 2,
 109         DHCPV6_NoBinding = 3,
 110         DHCPV6_NotOnLink = 4,
 111         DHCPV6_UseMulticast = 5,
 112         DHCPV6_NoPrefixAvail = 6,
 113         _DHCPV6_Status_Max
 114 };
 115
 116 enum dhcpv6_config {
 117         DHCPV6_STRICT_OPTIONS = 1,
 118         DHCPV6_CLIENT_FQDN = 2,
 119         DHCPV6_ACCEPT_RECONFIGURE = 4,
 120 };
 121
 122 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
 123                 const void *opt, const void *end, const struct sockaddr_in6 *from);
 124
 125 // retransmission strategy
 126 struct dhcpv6_retx {
 127         bool delay;
 128         uint8_t init_timeo;
 129         uint16_t max_timeo;
 130         uint8_t max_rc;
 131         char name[8];
 132         reply_handler *handler_reply;
 133         int(*handler_finish)(void);
 134 };
 135
 136 // DHCPv6 Protocol Headers
 137 struct dhcpv6_header {
 138         uint8_t msg_type;
 139         uint8_t tr_id[3];
 140 } __attribute__((packed));
 141
 142 struct dhcpv6_ia_hdr {
 143         uint16_t type;
 144         uint16_t len;
 145         uint32_t iaid;
 146         uint32_t t1;
 147         uint32_t t2;
 148 } _packed;
 149
 150 struct dhcpv6_ia_addr {
 151         uint16_t type;
 152         uint16_t len;
 153         struct in6_addr addr;
 154         uint32_t preferred;
 155         uint32_t valid;
 156 } _packed;
 157
 158 struct dhcpv6_ia_prefix {
 159         uint16_t type;
 160         uint16_t len;
 161         uint32_t preferred;
 162         uint32_t valid;
 163         uint8_t prefix;
 164         struct in6_addr addr;
 165 } _packed;
 166
 167 struct dhcpv6_duid {
 168         uint16_t type;
 169         uint16_t len;
 170         uint16_t duid_type;
 171         uint8_t data[128];
 172 } _packed;
 173
 174 struct dhcpv6_auth_reconfigure {
 175         uint16_t type;
 176         uint16_t len;
 177         uint8_t protocol;
 178         uint8_t algorithm;
 179         uint8_t rdm;
 180         uint64_t replay;
 181         uint8_t reconf_type;
 182         uint8_t key[16];
 183 } _packed;
 184
 185 struct dhcpv6_cer_id {
 186         uint16_t type;
 187         uint16_t len;
 188         struct in6_addr addr;
 189 } _packed;
 190
 191 struct dhcpv6_s46_portparams {
 192         uint8_t offset;
 193         uint8_t psid_len;
 194         uint16_t psid;
 195 } _packed;
 196
 197 struct dhcpv6_s46_v4v6bind {
 198         struct in_addr ipv4_address;
 199         uint8_t bindprefix6_len;
 200         uint8_t bind_ipv6_prefix[];
 201 } _packed;
 202
 203 struct dhcpv6_s46_dmr {
 204         uint8_t dmr_prefix6_len;
 205         uint8_t dmr_ipv6_prefix[];
 206 } _packed;
 207
 208 struct dhcpv6_s46_rule {
 209         uint8_t flags;
 210         uint8_t ea_len;
 211         uint8_t prefix4_len;
 212         struct in_addr ipv4_prefix;
 213         uint8_t prefix6_len;
 214         uint8_t ipv6_prefix[];
 215 } _packed;
 216
 217 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 218         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 219                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 220                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 221                 _o += 4 + (_o[2] << 8 | _o[3]))
 222
 223
 224 struct dhcpv6_server_cand {
 225         bool has_noaddravail;
 226         bool wants_reconfigure;
 227         int16_t preference;
 228         uint8_t duid_len;
 229         uint8_t duid[130];
 230         uint32_t sol_max_rt;
 231         uint32_t inf_max_rt;
 232         void *ia_na;
 233         void *ia_pd;
 234         size_t ia_na_len;
 235         size_t ia_pd_len;
 236 };
 237
 238
 239 enum odhcp6c_state {
 240         STATE_CLIENT_ID,
 241         STATE_SERVER_ID,
 242         STATE_SERVER_CAND,
 243         STATE_SERVER_ADDR,
 244         STATE_ORO,
 245         STATE_DNS,
 246         STATE_SEARCH,
 247         STATE_IA_NA,
 248         STATE_IA_PD,
 249         STATE_IA_PD_INIT,
 250         STATE_CUSTOM_OPTS,
 251         STATE_SNTP_IP,
 252         STATE_NTP_IP,
 253         STATE_NTP_FQDN,
 254         STATE_SIP_IP,
 255         STATE_SIP_FQDN,
 256         STATE_RA_ROUTE,
 257         STATE_RA_PREFIX,
 258         STATE_RA_DNS,
 259         STATE_RA_SEARCH,
 260         STATE_AFTR_NAME,
 261         STATE_VENDORCLASS,
 262         STATE_USERCLASS,
 263         STATE_CER,
 264         STATE_S46_MAPT,
 265         STATE_S46_MAPE,
 266         STATE_S46_LW,
 267         STATE_PASSTHRU,
 268         _STATE_MAX
 269 };
 270
 271
 272 struct icmp6_opt {
 273         uint8_t type;
 274         uint8_t len;
 275         uint8_t data[6];
 276 };
 277
 278
 279 enum dhcpv6_mode {
 280         DHCPV6_UNKNOWN = -1,
 281         DHCPV6_STATELESS,
 282         DHCPV6_STATEFUL
 283 };
 284
 285 enum ra_config {
 286         RA_RDNSS_DEFAULT_LIFETIME = 1,
 287 };
 288
 289 enum odhcp6c_ia_mode {
 290         IA_MODE_NONE,
 291         IA_MODE_TRY,
 292         IA_MODE_FORCE,
 293 };
 294
 295
 296 struct odhcp6c_entry {
 297         struct in6_addr router;
 298         uint8_t auxlen;
 299         uint8_t length;
 300         int16_t priority;
 301         struct in6_addr target;
 302         uint32_t valid;
 303         uint32_t preferred;
 304         uint32_t t1;
 305         uint32_t t2;
 306         uint32_t iaid;
 307         uint8_t auxtarget[];
 308 };
 309
 310 // Include padding after auxtarget to align the next entry
 311 #define odhcp6c_entry_size(entry) \
 312         (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
 313
 314 #define odhcp6c_next_entry(entry) \
 315         ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
 316
 317
 318 struct odhcp6c_request_prefix {
 319         uint32_t iaid;
 320         uint16_t length;
 321 };
 322
 323 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
 324 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 325 int dhcpv6_request(enum dhcpv6_msg type);
 326 int dhcpv6_poll_reconfigure(void);
 327 int dhcpv6_promote_server_cand(void);
 328
 329 int init_rtnetlink(void);
 330 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 331                 uint32_t pref, uint32_t valid);
 332
 333 int ra_conf_hoplimit(int newvalue);
 334 int ra_conf_mtu(int newvalue);
 335 int ra_conf_reachable(int newvalue);
 336 int ra_conf_retransmit(int newvalue);
 337
 338 int script_init(const char *path, const char *ifname);
 339 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 340 void script_call(const char *status, int delay, bool resume);
 341
 342 bool odhcp6c_signal_process(void);
 343 uint64_t odhcp6c_get_milli_time(void);
 344 int odhcp6c_random(void *buf, size_t len);
 345 bool odhcp6c_is_bound(void);
 346
 347 // State manipulation
 348 void odhcp6c_clear_state(enum odhcp6c_state state);
 349 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 350 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
 351 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
 352 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 353 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 354 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 355
 356 // Entry manipulation
 357 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, bool filterexcess);
 358
 359 void odhcp6c_expire(void);
 360 uint32_t odhcp6c_elapsed(void);