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_SNTP_SERVERS = 31,
  53         DHCPV6_OPT_INFO_REFRESH = 32,
  54         DHCPV6_OPT_FQDN = 39,
  55         DHCPV6_OPT_NTP_SERVER = 56,
  56         DHCPV6_OPT_SIP_SERVER_D = 21,
  57         DHCPV6_OPT_SIP_SERVER_A = 22,
  58         DHCPV6_OPT_AFTR_NAME = 64,
  59         DHCPV6_OPT_PD_EXCLUDE = 67,
  60         DHCPV6_OPT_SOL_MAX_RT = 82,
  61         DHCPV6_OPT_INF_MAX_RT = 83,
  62 #ifdef EXT_PREFIX_CLASS
  63         /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
  64         DHCPV6_OPT_PREFIX_CLASS = EXT_PREFIX_CLASS,
  65 #endif
  66 };
  67
  68 enum dhcpv6_opt_npt {
  69         NTP_SRV_ADDR = 1,
  70         NTP_MC_ADDR = 2,
  71         NTP_SRV_FQDN = 3
  72 };
  73
  74 enum dhcpv6_msg {
  75         DHCPV6_MSG_UNKNOWN = 0,
  76         DHCPV6_MSG_SOLICIT = 1,
  77         DHCPV6_MSG_ADVERT = 2,
  78         DHCPV6_MSG_REQUEST = 3,
  79         DHCPV6_MSG_RENEW = 5,
  80         DHCPV6_MSG_REBIND = 6,
  81         DHCPV6_MSG_REPLY = 7,
  82         DHCPV6_MSG_RELEASE = 8,
  83         DHCPV6_MSG_DECLINE = 9,
  84         DHCPV6_MSG_RECONF = 10,
  85         DHCPV6_MSG_INFO_REQ = 11,
  86         _DHCPV6_MSG_MAX
  87 };
  88
  89 enum dhcpv6_status {
  90         DHCPV6_Success = 0,
  91         DHCPV6_UnspecFail = 1,
  92         DHCPV6_NoAddrsAvail = 2,
  93         DHCPV6_NoBinding = 3,
  94         DHCPV6_NotOnLink = 4,
  95         DHCPV6_UseMulticast = 5,
  96         DHCPV6_NoPrefixAvail = 6,
  97         _DHCPV6_Status_Max
  98 };
  99
 100 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
 101                 const void *opt, const void *end);
 102
 103 // retransmission strategy
 104 struct dhcpv6_retx {
 105         bool delay;
 106         uint8_t init_timeo;
 107         uint16_t max_timeo;
 108         uint8_t max_rc;
 109         char name[8];
 110         reply_handler *handler_reply;
 111         int(*handler_finish)(void);
 112 };
 113
 114 // DHCPv6 Protocol Headers
 115 struct dhcpv6_header {
 116         uint8_t msg_type;
 117         uint8_t tr_id[3];
 118 } __attribute__((packed));
 119
 120 struct dhcpv6_ia_hdr {
 121         uint16_t type;
 122         uint16_t len;
 123         uint32_t iaid;
 124         uint32_t t1;
 125         uint32_t t2;
 126 } _packed;
 127
 128 struct dhcpv6_ia_addr {
 129         uint16_t type;
 130         uint16_t len;
 131         struct in6_addr addr;
 132         uint32_t preferred;
 133         uint32_t valid;
 134 } _packed;
 135
 136 struct dhcpv6_ia_prefix {
 137         uint16_t type;
 138         uint16_t len;
 139         uint32_t preferred;
 140         uint32_t valid;
 141         uint8_t prefix;
 142         struct in6_addr addr;
 143 } _packed;
 144
 145 struct dhcpv6_duid {
 146         uint16_t type;
 147         uint16_t len;
 148         uint16_t duid_type;
 149         uint8_t data[128];
 150 } _packed;
 151
 152 struct dhcpv6_auth_reconfigure {
 153         uint16_t type;
 154         uint16_t len;
 155         uint8_t protocol;
 156         uint8_t algorithm;
 157         uint8_t rdm;
 158         uint64_t replay;
 159         uint8_t reconf_type;
 160         uint8_t key[16];
 161 } _packed;
 162
 163
 164 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 165         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 166                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 167                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 168                 _o += 4 + (_o[2] << 8 | _o[3]))
 169
 170
 171 struct dhcpv6_server_cand {
 172         bool has_noaddravail;
 173         bool wants_reconfigure;
 174         int16_t preference;
 175         uint8_t duid_len;
 176         uint8_t duid[130];
 177         uint32_t sol_max_rt;
 178         uint32_t inf_max_rt;
 179         void *ia_na;
 180         void *ia_pd;
 181         size_t ia_na_len;
 182         size_t ia_pd_len;
 183 };
 184
 185
 186 enum odhcp6c_state {
 187         STATE_CLIENT_ID,
 188         STATE_SERVER_ID,
 189         STATE_SERVER_CAND,
 190         STATE_ORO,
 191         STATE_DNS,
 192         STATE_SEARCH,
 193         STATE_IA_NA,
 194         STATE_IA_PD,
 195         STATE_CUSTOM_OPTS,
 196         STATE_SNTP_IP,
 197         STATE_NTP_IP,
 198         STATE_NTP_FQDN,
 199         STATE_SIP_IP,
 200         STATE_SIP_FQDN,
 201         STATE_RA_ROUTE,
 202         STATE_RA_PREFIX,
 203         STATE_RA_DNS,
 204         STATE_AFTR_NAME,
 205         _STATE_MAX
 206 };
 207
 208
 209 struct icmp6_opt {
 210         uint8_t type;
 211         uint8_t len;
 212         uint8_t data[6];
 213 };
 214
 215
 216 enum dhcpv6_mode {
 217         DHCPV6_UNKNOWN = -1,
 218         DHCPV6_STATELESS,
 219         DHCPV6_STATEFUL
 220 };
 221
 222 enum odhcp6c_ia_mode {
 223         IA_MODE_NONE,
 224         IA_MODE_TRY,
 225         IA_MODE_FORCE,
 226 };
 227
 228
 229 struct odhcp6c_entry {
 230         struct in6_addr router;
 231         uint16_t length;
 232         int16_t priority;
 233         struct in6_addr target;
 234         uint32_t valid;
 235         uint32_t preferred;
 236         uint32_t t1;
 237         uint32_t t2;
 238         uint16_t class;
 239 };
 240
 241
 242 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout);
 243 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 244 int dhcpv6_request(enum dhcpv6_msg type);
 245 int dhcpv6_poll_reconfigure(void);
 246 int dhcpv6_promote_server_cand(void);
 247
 248 int init_rtnetlink(void);
 249 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 250                 uint32_t pref, uint32_t valid);
 251
 252 int script_init(const char *path, const char *ifname);
 253 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 254 void script_call(const char *status);
 255 void script_delay_call(const char *status, int timeout);
 256
 257 bool odhcp6c_signal_process(void);
 258 uint64_t odhcp6c_get_milli_time(void);
 259 void odhcp6c_random(void *buf, size_t len);
 260 bool odhcp6c_is_bound(void);
 261
 262 // State manipulation
 263 void odhcp6c_clear_state(enum odhcp6c_state state);
 264 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 265 void odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
 266 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 267 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 268 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 269
 270 // Entry manipulation
 271 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
 272 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
 273 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
 274
 275 void odhcp6c_expire(void);
 276 uint32_t odhcp6c_elapsed(void);