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_NoAddrsAvail = 2,
  85         DHCPV6_NoPrefixAvail = 6,
  86 };
  87
  88 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
  89                 const void *opt, const void *end);
  90
  91 // retransmission strategy
  92 struct dhcpv6_retx {
  93         bool delay;
  94         uint8_t init_timeo;
  95         uint16_t max_timeo;
  96         uint8_t max_rc;
  97         char name[8];
  98         reply_handler *handler_reply;
  99         int(*handler_finish)(void);
 100 };
 101
 102 // DHCPv6 Protocol Headers
 103 struct dhcpv6_header {
 104         uint8_t msg_type;
 105         uint8_t tr_id[3];
 106 } __attribute__((packed));
 107
 108 struct dhcpv6_ia_hdr {
 109         uint16_t type;
 110         uint16_t len;
 111         uint32_t iaid;
 112         uint32_t t1;
 113         uint32_t t2;
 114 } _packed;
 115
 116 struct dhcpv6_ia_addr {
 117         uint16_t type;
 118         uint16_t len;
 119         struct in6_addr addr;
 120         uint32_t preferred;
 121         uint32_t valid;
 122 } _packed;
 123
 124 struct dhcpv6_ia_prefix {
 125         uint16_t type;
 126         uint16_t len;
 127         uint32_t preferred;
 128         uint32_t valid;
 129         uint8_t prefix;
 130         struct in6_addr addr;
 131 } _packed;
 132
 133 struct dhcpv6_duid {
 134         uint16_t type;
 135         uint16_t len;
 136         uint16_t duid_type;
 137         uint8_t data[128];
 138 } _packed;
 139
 140 struct dhcpv6_auth_reconfigure {
 141         uint16_t type;
 142         uint16_t len;
 143         uint8_t protocol;
 144         uint8_t algorithm;
 145         uint8_t rdm;
 146         uint64_t replay;
 147         uint8_t reconf_type;
 148         uint8_t key[16];
 149 } _packed;
 150
 151
 152 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 153         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
 154                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 155                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
 156                 _o += 4 + (_o[2] << 8 | _o[3]))
 157
 158
 159 struct dhcpv6_server_cand {
 160         bool has_noaddravail;
 161         bool wants_reconfigure;
 162         int16_t preference;
 163         uint8_t duid_len;
 164         uint8_t duid[130];
 165         void *ia_na;
 166         void *ia_pd;
 167         size_t ia_na_len;
 168         size_t ia_pd_len;
 169 };
 170
 171
 172 enum odhcp6c_state {
 173         STATE_CLIENT_ID,
 174         STATE_SERVER_ID,
 175         STATE_SERVER_CAND,
 176         STATE_ORO,
 177         STATE_DNS,
 178         STATE_SEARCH,
 179         STATE_IA_NA,
 180         STATE_IA_PD,
 181         STATE_CUSTOM_OPTS,
 182         STATE_SNTP_IP,
 183         STATE_SNTP_FQDN,
 184         STATE_SIP_IP,
 185         STATE_SIP_FQDN,
 186         STATE_RA_ROUTE,
 187         STATE_RA_PREFIX,
 188         STATE_RA_DNS,
 189         STATE_AFTR_NAME,
 190         _STATE_MAX
 191 };
 192
 193
 194 struct icmp6_opt {
 195         uint8_t type;
 196         uint8_t len;
 197         uint8_t data[6];
 198 };
 199
 200
 201 enum dhcpv6_mode {
 202         DHCPV6_UNKNOWN,
 203         DHCPV6_STATELESS,
 204         DHCPV6_STATEFUL
 205 };
 206
 207
 208 enum odhcp6c_ia_mode {
 209         IA_MODE_NONE,
 210         IA_MODE_TRY,
 211         IA_MODE_FORCE,
 212 };
 213
 214
 215 struct odhcp6c_entry {
 216         struct in6_addr router;
 217         uint16_t length;
 218         int16_t priority;
 219         struct in6_addr target;
 220         uint32_t valid;
 221         uint32_t preferred;
 222         uint16_t class;
 223 };
 224
 225
 226 int init_dhcpv6(const char *ifname, int request_pd, int sol_timeout);
 227 void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
 228 int dhcpv6_request(enum dhcpv6_msg type);
 229 int dhcpv6_poll_reconfigure(void);
 230
 231 int init_rtnetlink(void);
 232 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
 233                 uint32_t pref, uint32_t valid);
 234
 235 int script_init(const char *path, const char *ifname);
 236 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
 237 void script_call(const char *status);
 238 void script_delay_call(const char *status, int timeout);
 239
 240 bool odhcp6c_signal_process(void);
 241 uint64_t odhcp6c_get_milli_time(void);
 242 void odhcp6c_random(void *buf, size_t len);
 243
 244 // State manipulation
 245 void odhcp6c_clear_state(enum odhcp6c_state state);
 246 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
 247 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
 248 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
 249 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
 250
 251 // Entry manipulation
 252 struct odhcp6c_entry* odhcp6c_find_entry(enum odhcp6c_state state, const struct odhcp6c_entry *new);
 253 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new);
 254 bool odhcp6c_update_entry_safe(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe);
 255
 256 void odhcp6c_expire(void);
 257 uint32_t odhcp6c_elapsed(void);