src/odhcp6c.h

   1 /**
   2  * Copyright (C) 2012-2013 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 enum dhcvp6_opt {
  35         DHCPV6_OPT_CLIENTID = 1,
  36         DHCPV6_OPT_SERVERID = 2,
  37         DHCPV6_OPT_IA_NA = 3,
  38         DHCPV6_OPT_IA_ADDR = 5,
  39         DHCPV6_OPT_ORO = 6,
  40         DHCPV6_OPT_PREF = 7,
  41         DHCPV6_OPT_ELAPSED = 8,
  42         DHCPV6_OPT_RELAY_MSG = 9,
  43         DHCPV6_OPT_AUTH = 11,
  44         DHCPV6_OPT_STATUS = 13,
  45         DHCPV6_OPT_RAPID_COMMIT = 14,
  46         DHCPV6_OPT_RECONF_MESSAGE = 19,
  47         DHCPV6_OPT_RECONF_ACCEPT = 20,
  48         DHCPV6_OPT_DNS_SERVERS = 23,
  49         DHCPV6_OPT_DNS_DOMAIN = 24,
  50         DHCPV6_OPT_IA_PD = 25,
  51         DHCPV6_OPT_IA_PREFIX = 26,
  52         DHCPV6_OPT_INFO_REFRESH = 32,
  53         DHCPV6_OPT_FQDN = 39,
  54         DHCPV6_OPT_NTP_SERVER = 56,
  55         DHCPV6_OPT_SIP_SERVER_D = 21,
  56         DHCPV6_OPT_SIP_SERVER_A = 22,
  57         DHCPV6_OPT_AFTR_NAME = 64,
  58         DHCPV6_OPT_PD_EXCLUDE = 67,
  59         DHCPV6_OPT_SOL_MAX_RT = 82,
  60         DHCPV6_OPT_INF_MAX_RT = 83,
  61 #ifdef EXT_PREFIX_CLASS
  62         /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
  63         DHCPV6_OPT_PREFIX_CLASS = EXT_PREFIX_CLASS,
  64 #endif
  65 };
  66
  67 enum dhcpv6_opt_npt {
  68         NTP_SRV_ADDR = 1,
  69         NTP_MC_ADDR = 2,
  70         NTP_SRV_FQDN = 3
  71 };
  72
  73 enum dhcpv6_msg {
  74         DHCPV6_MSG_UNKNOWN = 0,
  75         DHCPV6_MSG_SOLICIT = 1,
  76         DHCPV6_MSG_ADVERT = 2,
  77         DHCPV6_MSG_REQUEST = 3,
  78         DHCPV6_MSG_RENEW = 5,
  79         DHCPV6_MSG_REBIND = 6,
  80         DHCPV6_MSG_REPLY = 7,
  81         DHCPV6_MSG_RELEASE = 8,
  82         DHCPV6_MSG_DECLINE = 9,
  83         DHCPV6_MSG_RECONF = 10,
  84         DHCPV6_MSG_INFO_REQ = 11,
  85         _DHCPV6_MSG_MAX
  86 };
  87
  88 enum dhcpv6_status {
  89         DHCPV6_Success = 0,
  90         DHCPV6_UnspecFail = 1,
  91         DHCPV6_NoAddrsAvail = 2,
  92         DHCPV6_NoBinding = 3,
  93         DHCPV6_NotOnLink = 4,
  94         DHCPV6_UseMulticast = 5,
  95         DHCPV6_NoPrefixAvail = 6,
  96         _DHCPV6_Status_Max
  97 };
  98
  99 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
 100                 const void *opt, const void *end);
 101
 102 // retransmission strategy
 103 struct dhcpv6_retx {
 104         bool delay;
 105         uint8_t init_timeo;
 106         uint16_t max_timeo;
 107         uint8_t max_rc;
 108         char name[8];
 109         reply_handler *handler_reply;
 110         int(*handler_finish)(void);
 111 };
 112
 113 // DHCPv6 Protocol Headers
 114 struct dhcpv6_header {
 115         uint8_t msg_type;
 116         uint8_t tr_id[3];
 117 } __attribute__((packed));
 118
 119 struct dhcpv6_ia_hdr {
 120         uint16_t type;
 121         uint16_t len;
 122         uint32_t iaid;
 123         uint32_t t1;
 124         uint32_t t2;
 125 } _packed;
 126
 127 struct dhcpv6_ia_addr {
 128         uint16_t type;
 129         uint16_t len;
 130         struct in6_addr addr;
 131         uint32_t preferred;
 132         uint32_t valid;
 133 } _packed;
 134
 135 struct dhcpv6_ia_prefix {
 136         uint16_t type;
 137         uint16_t len;
 138         uint32_t preferred;
 139         uint32_t valid;
 140         uint8_t prefix;
 141         struct in6_addr addr;
 142 } _packed;
 143
 144 struct dhcpv6_duid {
 145         uint16_t type;
 146         uint16_t len;
 147         uint16_t duid_type;
 148         uint8_t data[128];
 149 } _packed;
 150
 151 struct dhcpv6_auth_reconfigure {
 152         uint16_t type;
 153         uint16_t len;
 154         uint8_t protocol;
 155         uint8_t algorithm;
 156         uint8_t rdm;
 157         uint64_t replay;
 158         uint8_t reconf_type;
 159         uint8_t key[16];
 160 } _packed;
 161
 162
 163 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 164         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 165                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 166                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 167                 _o += 4 + (_o[2] << 8 | _o[3]))
 168
 169
 170 struct dhcpv6_server_cand {
 171         bool has_noaddravail;
 172         bool wants_reconfigure;
 173         int16_t preference;
 174         uint8_t duid_len;
 175         uint8_t duid[130];
 176         uint32_t sol_max_rt;
 177         uint32_t inf_max_rt;
 178         void *ia_na;
 179         void *ia_pd;
 180         size_t ia_na_len;
 181         size_t ia_pd_len;
 182 };
 183
 184
 185 enum odhcp6c_state {
 186         STATE_CLIENT_ID,
 187         STATE_SERVER_ID,
 188         STATE_SERVER_CAND,
 189         STATE_ORO,
 190         STATE_DNS,
 191         STATE_SEARCH,
 192         STATE_IA_NA,
 193         STATE_IA_PD,
 194         STATE_CUSTOM_OPTS,
 195         STATE_SNTP_IP,
 196         STATE_SNTP_FQDN,
 197         STATE_SIP_IP,
 198         STATE_SIP_FQDN,
 199         STATE_RA_ROUTE,
 200         STATE_RA_PREFIX,
 201         STATE_RA_DNS,
 202         STATE_AFTR_NAME,
 203         _STATE_MAX
 204 };
 205
 206
 207 struct icmp6_opt {
 208         uint8_t type;
 209         uint8_t len;
 210         uint8_t data[6];
 211 };
 212
 213
 214 enum dhcpv6_mode {
 215         DHCPV6_UNKNOWN = -1,
 216         DHCPV6_STATELESS,
 217         DHCPV6_STATEFUL
 218 };
 219
 220 enum odhcp6c_ia_mode {
 221         IA_MODE_NONE,
 222         IA_MODE_TRY,
 223         IA_MODE_FORCE,
 224 };
 225
 226
 227 struct odhcp6c_entry {
 228         struct in6_addr router;
 229         uint16_t length;
 230         int16_t priority;
 231         struct in6_addr target;
 232         uint32_t valid;
 233         uint32_t preferred;
 234         uint32_t t1;
 235         uint32_t t2;
 236         uint16_t class;
 237 };
 238
 239
 240 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout);
 241 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 242 int dhcpv6_request(enum dhcpv6_msg type);
 243 int dhcpv6_poll_reconfigure(void);
 244 int dhcpv6_promote_server_cand(void);
 245
 246 int init_rtnetlink(void);
 247 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 248                 uint32_t pref, uint32_t valid);
 249
 250 int script_init(const char *path, const char *ifname);
 251 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 252 void script_call(const char *status);
 253 void script_delay_call(const char *status, int timeout);
 254
 255 bool odhcp6c_signal_process(void);
 256 uint64_t odhcp6c_get_milli_time(void);
 257 void odhcp6c_random(void *buf, size_t len);
 258 bool odhcp6c_is_bound(void);
 259
 260 // State manipulation
 261 void odhcp6c_clear_state(enum odhcp6c_state state);
 262 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 263 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
 264 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 265 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 266 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 267
 268 // Entry manipulation
 269 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
 270 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
 271 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
 272
 273 void odhcp6c_expire(void);
 274 uint32_t odhcp6c_elapsed(void);