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
  22 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  23
  24 #define ND_OPT_RECURSIVE_DNS 25
  25 #define ND_OPT_DNSSL 31
  26
  27 #define DHCPV6_SOL_MAX_RT 3600
  28 #define DHCPV6_REQ_MAX_RT 30
  29 #define DHCPV6_CNF_MAX_RT 4
  30 #define DHCPV6_REN_MAX_RT 600
  31 #define DHCPV6_REB_MAX_RT 600
  32 #define DHCPV6_INF_MAX_RT 3600
  33
  34 #define DEFAULT_MIN_UPDATE_INTERVAL 30
  35
  36 enum dhcvp6_opt {
  37         DHCPV6_OPT_CLIENTID = 1,
  38         DHCPV6_OPT_SERVERID = 2,
  39         DHCPV6_OPT_IA_NA = 3,
  40         DHCPV6_OPT_IA_TA = 4,
  41         DHCPV6_OPT_IA_ADDR = 5,
  42         DHCPV6_OPT_ORO = 6,
  43         DHCPV6_OPT_PREF = 7,
  44         DHCPV6_OPT_ELAPSED = 8,
  45         DHCPV6_OPT_RELAY_MSG = 9,
  46         DHCPV6_OPT_AUTH = 11,
  47         DHCPV6_OPT_UNICAST = 12,
  48         DHCPV6_OPT_STATUS = 13,
  49         DHCPV6_OPT_RAPID_COMMIT = 14,
  50         DHCPV6_OPT_USER_CLASS = 15,
  51         DHCPV6_OPT_VENDOR_CLASS = 16,
  52         DHCPV6_OPT_RECONF_MESSAGE = 19,
  53         DHCPV6_OPT_RECONF_ACCEPT = 20,
  54         DHCPV6_OPT_DNS_SERVERS = 23,
  55         DHCPV6_OPT_DNS_DOMAIN = 24,
  56         DHCPV6_OPT_IA_PD = 25,
  57         DHCPV6_OPT_IA_PREFIX = 26,
  58         DHCPV6_OPT_SNTP_SERVERS = 31,
  59         DHCPV6_OPT_INFO_REFRESH = 32,
  60         DHCPV6_OPT_FQDN = 39,
  61         DHCPV6_OPT_NTP_SERVER = 56,
  62         DHCPV6_OPT_SIP_SERVER_D = 21,
  63         DHCPV6_OPT_SIP_SERVER_A = 22,
  64         DHCPV6_OPT_AFTR_NAME = 64,
  65         DHCPV6_OPT_PD_EXCLUDE = 67,
  66         DHCPV6_OPT_SOL_MAX_RT = 82,
  67         DHCPV6_OPT_INF_MAX_RT = 83,
  68 #ifdef EXT_CER_ID
  69         /* draft-donley-dhc-cer-id-option-03 */
  70         DHCPV6_OPT_CER_ID = EXT_CER_ID,
  71 #endif
  72         /* draft-ietf-softwire-map-dhcp-08 */
  73         DHCPV6_OPT_S46_RULE = 89,
  74         DHCPV6_OPT_S46_BR = 90,
  75         DHCPV6_OPT_S46_DMR = 91,
  76         DHCPV6_OPT_S46_V4V6BIND = 92,
  77         DHCPV6_OPT_S46_PORTPARAMS = 93,
  78         DHCPV6_OPT_S46_CONT_MAPE = 94,
  79         DHCPV6_OPT_S46_CONT_MAPT = 95,
  80         DHCPV6_OPT_S46_CONT_LW = 96,
  81 };
  82
  83 enum dhcpv6_opt_npt {
  84         NTP_SRV_ADDR = 1,
  85         NTP_MC_ADDR = 2,
  86         NTP_SRV_FQDN = 3
  87 };
  88
  89 enum dhcpv6_msg {
  90         DHCPV6_MSG_UNKNOWN = 0,
  91         DHCPV6_MSG_SOLICIT = 1,
  92         DHCPV6_MSG_ADVERT = 2,
  93         DHCPV6_MSG_REQUEST = 3,
  94         DHCPV6_MSG_RENEW = 5,
  95         DHCPV6_MSG_REBIND = 6,
  96         DHCPV6_MSG_REPLY = 7,
  97         DHCPV6_MSG_RELEASE = 8,
  98         DHCPV6_MSG_DECLINE = 9,
  99         DHCPV6_MSG_RECONF = 10,
 100         DHCPV6_MSG_INFO_REQ = 11,
 101         _DHCPV6_MSG_MAX
 102 };
 103
 104 enum dhcpv6_status {
 105         DHCPV6_Success = 0,
 106         DHCPV6_UnspecFail = 1,
 107         DHCPV6_NoAddrsAvail = 2,
 108         DHCPV6_NoBinding = 3,
 109         DHCPV6_NotOnLink = 4,
 110         DHCPV6_UseMulticast = 5,
 111         DHCPV6_NoPrefixAvail = 6,
 112         _DHCPV6_Status_Max
 113 };
 114
 115 enum dhcpv6_config {
 116         DHCPV6_STRICT_OPTIONS = 1,
 117         DHCPV6_CLIENT_FQDN = 2,
 118         DHCPV6_ACCEPT_RECONFIGURE = 4,
 119 };
 120
 121 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
 122                 const void *opt, const void *end, const struct sockaddr_in6 *from);
 123
 124 // retransmission strategy
 125 struct dhcpv6_retx {
 126         bool delay;
 127         uint8_t init_timeo;
 128         uint16_t max_timeo;
 129         uint8_t max_rc;
 130         char name[8];
 131         reply_handler *handler_reply;
 132         int(*handler_finish)(void);
 133 };
 134
 135 // DHCPv6 Protocol Headers
 136 struct dhcpv6_header {
 137         uint8_t msg_type;
 138         uint8_t tr_id[3];
 139 } __attribute__((packed));
 140
 141 struct dhcpv6_ia_hdr {
 142         uint16_t type;
 143         uint16_t len;
 144         uint32_t iaid;
 145         uint32_t t1;
 146         uint32_t t2;
 147 } _packed;
 148
 149 struct dhcpv6_ia_addr {
 150         uint16_t type;
 151         uint16_t len;
 152         struct in6_addr addr;
 153         uint32_t preferred;
 154         uint32_t valid;
 155 } _packed;
 156
 157 struct dhcpv6_ia_prefix {
 158         uint16_t type;
 159         uint16_t len;
 160         uint32_t preferred;
 161         uint32_t valid;
 162         uint8_t prefix;
 163         struct in6_addr addr;
 164 } _packed;
 165
 166 struct dhcpv6_duid {
 167         uint16_t type;
 168         uint16_t len;
 169         uint16_t duid_type;
 170         uint8_t data[128];
 171 } _packed;
 172
 173 struct dhcpv6_auth_reconfigure {
 174         uint16_t type;
 175         uint16_t len;
 176         uint8_t protocol;
 177         uint8_t algorithm;
 178         uint8_t rdm;
 179         uint64_t replay;
 180         uint8_t reconf_type;
 181         uint8_t key[16];
 182 } _packed;
 183
 184 struct dhcpv6_cer_id {
 185         uint16_t type;
 186         uint16_t len;
 187         struct in6_addr addr;
 188 } _packed;
 189
 190 struct dhcpv6_s46_portparams {
 191         uint8_t offset;
 192         uint8_t psid_len;
 193         uint16_t psid;
 194 } _packed;
 195
 196 struct dhcpv6_s46_v4v6bind {
 197         struct in_addr ipv4_address;
 198         uint8_t bindprefix6_len;
 199         uint8_t bind_ipv6_prefix[];
 200 } _packed;
 201
 202 struct dhcpv6_s46_dmr {
 203         uint8_t dmr_prefix6_len;
 204         uint8_t dmr_ipv6_prefix[];
 205 } _packed;
 206
 207 struct dhcpv6_s46_rule {
 208         uint8_t flags;
 209         uint8_t ea_len;
 210         uint8_t prefix4_len;
 211         struct in_addr ipv4_prefix;
 212         uint8_t prefix6_len;
 213         uint8_t ipv6_prefix[];
 214 } _packed;
 215
 216 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 217         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 218                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 219                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 220                 _o += 4 + (_o[2] << 8 | _o[3]))
 221
 222
 223 struct dhcpv6_server_cand {
 224         bool has_noaddravail;
 225         bool wants_reconfigure;
 226         int16_t preference;
 227         uint8_t duid_len;
 228         uint8_t duid[130];
 229         uint32_t sol_max_rt;
 230         uint32_t inf_max_rt;
 231         void *ia_na;
 232         void *ia_pd;
 233         size_t ia_na_len;
 234         size_t ia_pd_len;
 235 };
 236
 237
 238 enum odhcp6c_state {
 239         STATE_CLIENT_ID,
 240         STATE_SERVER_ID,
 241         STATE_SERVER_CAND,
 242         STATE_SERVER_ADDR,
 243         STATE_ORO,
 244         STATE_DNS,
 245         STATE_SEARCH,
 246         STATE_IA_NA,
 247         STATE_IA_PD,
 248         STATE_IA_PD_INIT,
 249         STATE_CUSTOM_OPTS,
 250         STATE_SNTP_IP,
 251         STATE_NTP_IP,
 252         STATE_NTP_FQDN,
 253         STATE_SIP_IP,
 254         STATE_SIP_FQDN,
 255         STATE_RA_ROUTE,
 256         STATE_RA_PREFIX,
 257         STATE_RA_DNS,
 258         STATE_AFTR_NAME,
 259         STATE_VENDORCLASS,
 260         STATE_USERCLASS,
 261         STATE_CER,
 262         STATE_S46_MAPT,
 263         STATE_S46_MAPE,
 264         STATE_S46_LW,
 265         STATE_PASSTHRU,
 266         _STATE_MAX
 267 };
 268
 269
 270 struct icmp6_opt {
 271         uint8_t type;
 272         uint8_t len;
 273         uint8_t data[6];
 274 };
 275
 276
 277 enum dhcpv6_mode {
 278         DHCPV6_UNKNOWN = -1,
 279         DHCPV6_STATELESS,
 280         DHCPV6_STATEFUL
 281 };
 282
 283 enum odhcp6c_ia_mode {
 284         IA_MODE_NONE,
 285         IA_MODE_TRY,
 286         IA_MODE_FORCE,
 287 };
 288
 289
 290 struct odhcp6c_entry {
 291         struct in6_addr router;
 292         uint16_t length;
 293         int16_t priority;
 294         struct in6_addr target;
 295         uint32_t valid;
 296         uint32_t preferred;
 297         uint32_t t1;
 298         uint32_t t2;
 299         uint32_t iaid;
 300 };
 301
 302 struct odhcp6c_request_prefix {
 303         uint32_t iaid;
 304         uint16_t length;
 305 };
 306
 307 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
 308 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 309 int dhcpv6_request(enum dhcpv6_msg type);
 310 int dhcpv6_poll_reconfigure(void);
 311 int dhcpv6_promote_server_cand(void);
 312
 313 int init_rtnetlink(void);
 314 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 315                 uint32_t pref, uint32_t valid);
 316
 317 int ra_conf_hoplimit(int newvalue);
 318 int ra_conf_mtu(int newvalue);
 319 int ra_conf_reachable(int newvalue);
 320 int ra_conf_retransmit(int newvalue);
 321
 322 int script_init(const char *path, const char *ifname);
 323 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 324 void script_call(const char *status);
 325
 326 bool odhcp6c_signal_process(void);
 327 uint64_t odhcp6c_get_milli_time(void);
 328 int odhcp6c_random(void *buf, size_t len);
 329 bool odhcp6c_is_bound(void);
 330
 331 // State manipulation
 332 void odhcp6c_clear_state(enum odhcp6c_state state);
 333 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 334 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
 335 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
 336 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 337 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 338 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 339
 340 // Entry manipulation
 341 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, bool filterexcess);
 342
 343 void odhcp6c_expire(void);
 344 uint32_t odhcp6c_elapsed(void);