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 #ifndef SOL_NETLINK
  25 #define SOL_NETLINK 270
  26 #endif
  27
  28 #define ND_OPT_RECURSIVE_DNS 25
  29 #define ND_OPT_DNSSL 31
  30
  31 enum dhcvp6_opt {
  32         DHCPV6_OPT_CLIENTID = 1,
  33         DHCPV6_OPT_SERVERID = 2,
  34         DHCPV6_OPT_IA_NA = 3,
  35         DHCPV6_OPT_IA_ADDR = 5,
  36         DHCPV6_OPT_ORO = 6,
  37         DHCPV6_OPT_PREF = 7,
  38         DHCPV6_OPT_ELAPSED = 8,
  39         DHCPV6_OPT_RELAY_MSG = 9,
  40         DHCPV6_OPT_AUTH = 11,
  41         DHCPV6_OPT_STATUS = 13,
  42         DHCPV6_OPT_RAPID_COMMIT = 14,
  43         DHCPV6_OPT_RECONF_MESSAGE = 19,
  44         DHCPV6_OPT_RECONF_ACCEPT = 20,
  45         DHCPV6_OPT_DNS_SERVERS = 23,
  46         DHCPV6_OPT_DNS_DOMAIN = 24,
  47         DHCPV6_OPT_IA_PD = 25,
  48         DHCPV6_OPT_IA_PREFIX = 26,
  49         DHCPV6_OPT_INFO_REFRESH = 32,
  50         DHCPV6_OPT_FQDN = 39,
  51         DHCPV6_OPT_NTP_SERVER = 56,
  52         DHCPV6_OPT_SIP_SERVER_D = 21,
  53         DHCPV6_OPT_SIP_SERVER_A = 22,
  54         DHCPV6_OPT_AFTR_NAME = 64,
  55         DHCPV6_OPT_PD_EXCLUDE = 67,
  56 #ifdef EXT_PREFIX_CLASS
  57         /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
  58         DHCPV6_OPT_PREFIX_CLASS = EXT_PREFIX_CLASS,
  59 #endif
  60 };
  61
  62 enum dhcpv6_opt_npt {
  63         NTP_SRV_ADDR = 1,
  64         NTP_MC_ADDR = 2,
  65         NTP_SRV_FQDN = 3
  66 };
  67
  68 enum dhcpv6_msg {
  69         DHCPV6_MSG_UNKNOWN = 0,
  70         DHCPV6_MSG_SOLICIT = 1,
  71         DHCPV6_MSG_ADVERT = 2,
  72         DHCPV6_MSG_REQUEST = 3,
  73         DHCPV6_MSG_RENEW = 5,
  74         DHCPV6_MSG_REBIND = 6,
  75         DHCPV6_MSG_REPLY = 7,
  76         DHCPV6_MSG_RELEASE = 8,
  77         DHCPV6_MSG_DECLINE = 9,
  78         DHCPV6_MSG_RECONF = 10,
  79         DHCPV6_MSG_INFO_REQ = 11,
  80         _DHCPV6_MSG_MAX
  81 };
  82
  83 enum dhcpv6_status {
  84         DHCPV6_Success = 0,
  85         DHCPV6_UnspecFail = 1,
  86         DHCPV6_NoAddrsAvail = 2,
  87         DHCPV6_NoBinding = 3,
  88         DHCPV6_NotOnLink = 4,
  89         DHCPV6_UseMulticast = 5,
  90         DHCPV6_NoPrefixAvail = 6,
  91         _DHCPV6_Status_Max
  92 };
  93
  94 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
  95                 const void *opt, const void *end);
  96
  97 // retransmission strategy
  98 struct dhcpv6_retx {
  99         bool delay;
 100         uint8_t init_timeo;
 101         uint16_t max_timeo;
 102         uint8_t max_rc;
 103         char name[8];
 104         reply_handler *handler_reply;
 105         int(*handler_finish)(void);
 106 };
 107
 108 // DHCPv6 Protocol Headers
 109 struct dhcpv6_header {
 110         uint8_t msg_type;
 111         uint8_t tr_id[3];
 112 } __attribute__((packed));
 113
 114 struct dhcpv6_ia_hdr {
 115         uint16_t type;
 116         uint16_t len;
 117         uint32_t iaid;
 118         uint32_t t1;
 119         uint32_t t2;
 120 } _packed;
 121
 122 struct dhcpv6_ia_addr {
 123         uint16_t type;
 124         uint16_t len;
 125         struct in6_addr addr;
 126         uint32_t preferred;
 127         uint32_t valid;
 128 } _packed;
 129
 130 struct dhcpv6_ia_prefix {
 131         uint16_t type;
 132         uint16_t len;
 133         uint32_t preferred;
 134         uint32_t valid;
 135         uint8_t prefix;
 136         struct in6_addr addr;
 137 } _packed;
 138
 139 struct dhcpv6_duid {
 140         uint16_t type;
 141         uint16_t len;
 142         uint16_t duid_type;
 143         uint8_t data[128];
 144 } _packed;
 145
 146 struct dhcpv6_auth_reconfigure {
 147         uint16_t type;
 148         uint16_t len;
 149         uint8_t protocol;
 150         uint8_t algorithm;
 151         uint8_t rdm;
 152         uint64_t replay;
 153         uint8_t reconf_type;
 154         uint8_t key[16];
 155 } _packed;
 156
 157
 158 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 159         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 160                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 161                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 162                 _o += 4 + (_o[2] << 8 | _o[3]))
 163
 164
 165 struct dhcpv6_server_cand {
 166         bool has_noaddravail;
 167         bool wants_reconfigure;
 168         int16_t preference;
 169         uint8_t duid_len;
 170         uint8_t duid[130];
 171         void *ia_na;
 172         void *ia_pd;
 173         size_t ia_na_len;
 174         size_t ia_pd_len;
 175 };
 176
 177
 178 enum odhcp6c_state {
 179         STATE_CLIENT_ID,
 180         STATE_SERVER_ID,
 181         STATE_SERVER_CAND,
 182         STATE_ORO,
 183         STATE_DNS,
 184         STATE_SEARCH,
 185         STATE_IA_NA,
 186         STATE_IA_PD,
 187         STATE_CUSTOM_OPTS,
 188         STATE_SNTP_IP,
 189         STATE_SNTP_FQDN,
 190         STATE_SIP_IP,
 191         STATE_SIP_FQDN,
 192         STATE_RA_ROUTE,
 193         STATE_RA_PREFIX,
 194         STATE_RA_DNS,
 195         STATE_AFTR_NAME,
 196         _STATE_MAX
 197 };
 198
 199
 200 struct icmp6_opt {
 201         uint8_t type;
 202         uint8_t len;
 203         uint8_t data[6];
 204 };
 205
 206
 207 enum dhcpv6_mode {
 208         DHCPV6_UNKNOWN,
 209         DHCPV6_STATELESS,
 210         DHCPV6_STATEFUL
 211 };
 212
 213
 214 enum odhcp6c_ia_mode {
 215         IA_MODE_NONE,
 216         IA_MODE_TRY,
 217         IA_MODE_FORCE,
 218 };
 219
 220
 221 struct odhcp6c_entry {
 222         struct in6_addr router;
 223         uint16_t length;
 224         int16_t priority;
 225         struct in6_addr target;
 226         uint32_t valid;
 227         uint32_t preferred;
 228         uint32_t t1;
 229         uint32_t t2;
 230         uint16_t class;
 231 };
 232
 233
 234 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout);
 235 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 236 int dhcpv6_request(enum dhcpv6_msg type);
 237 int dhcpv6_poll_reconfigure(void);
 238
 239 int init_rtnetlink(void);
 240 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 241                 uint32_t pref, uint32_t valid);
 242
 243 int script_init(const char *path, const char *ifname);
 244 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 245 void script_call(const char *status);
 246 void script_delay_call(const char *status, int timeout);
 247
 248 bool odhcp6c_signal_process(void);
 249 uint64_t odhcp6c_get_milli_time(void);
 250 void odhcp6c_random(void *buf, size_t len);
 251 bool odhcp6c_is_bound(void);
 252
 253 // State manipulation
 254 void odhcp6c_clear_state(enum odhcp6c_state state);
 255 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 256 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 257 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 258 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 259
 260 // Entry manipulation
 261 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
 262 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
 263 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
 264
 265 void odhcp6c_expire(void);
 266 uint32_t odhcp6c_elapsed(void);