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