src/dhcpv6.h

   1 /**
   2  *   Copyright (C) 2012 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 version 2
   6  *   as published by 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 version 2 for more details.
  12  *
  13  */
  14 #pragma once
  15
  16 #include <libubox/ustream.h>
  17
  18 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  19                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
  20
  21 #define ALL_DHCPV6_SERVERS {{{0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  22                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03}}}
  23
  24 #define DHCPV6_CLIENT_PORT 546
  25 #define DHCPV6_SERVER_PORT 547
  26
  27 #define DHCPV6_MSG_SOLICIT 1
  28 #define DHCPV6_MSG_ADVERTISE 2
  29 #define DHCPV6_MSG_REQUEST 3
  30 #define DHCPV6_MSG_CONFIRM 4
  31 #define DHCPV6_MSG_RENEW 5
  32 #define DHCPV6_MSG_REBIND 6
  33 #define DHCPV6_MSG_REPLY 7
  34 #define DHCPV6_MSG_RELEASE 8
  35 #define DHCPV6_MSG_DECLINE 9
  36 #define DHCPV6_MSG_RECONFIGURE 10
  37 #define DHCPV6_MSG_INFORMATION_REQUEST 11
  38 #define DHCPV6_MSG_RELAY_FORW 12
  39 #define DHCPV6_MSG_RELAY_REPL 13
  40
  41 #define DHCPV6_OPT_CLIENTID 1
  42 #define DHCPV6_OPT_SERVERID 2
  43 #define DHCPV6_OPT_IA_NA 3
  44 #define DHCPV6_OPT_IA_ADDR 5
  45 #define DHCPV6_OPT_ORO 6
  46 #define DHCPV6_OPT_STATUS 13
  47 #define DHCPV6_OPT_RELAY_MSG 9
  48 #define DHCPV6_OPT_AUTH 11
  49 #define DHCPV6_OPT_USER_CLASS 15
  50 #define DHCPV6_OPT_INTERFACE_ID 18
  51 #define DHCPV6_OPT_RECONF_MSG 19
  52 #define DHCPV6_OPT_RECONF_ACCEPT 20
  53 #define DHCPV6_OPT_DNS_SERVERS 23
  54 #define DHCPV6_OPT_DNS_DOMAIN 24
  55 #define DHCPV6_OPT_IA_PD 25
  56 #define DHCPV6_OPT_IA_PREFIX 26
  57 #define DHCPV6_OPT_INFO_REFRESH 32
  58 #define DHCPV6_OPT_FQDN 39
  59 #define DHCPV6_OPT_SOL_MAX_RT 82
  60 #define DHCPV6_OPT_INF_MAX_RT 83
  61
  62 #ifdef EXT_PREFIX_CLASS
  63 /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
  64 #define DHCPV6_OPT_PREFIX_CLASS EXT_PREFIX_CLASS
  65 #endif
  66
  67 #define DHCPV6_DUID_VENDOR 2
  68
  69 #define DHCPV6_STATUS_OK 0
  70 #define DHCPV6_STATUS_NOADDRSAVAIL 2
  71 #define DHCPV6_STATUS_NOBINDING 3
  72 #define DHCPV6_STATUS_NOTONLINK 4
  73 #define DHCPV6_STATUS_USEMULTICAST 5
  74 #define DHCPV6_STATUS_NOPREFIXAVAIL 6
  75
  76 // I just remembered I have an old one lying around...
  77 #define DHCPV6_ENT_NO  30462
  78 #define DHCPV6_ENT_TYPE 1
  79
  80
  81 #define DHCPV6_HOP_COUNT_LIMIT 32
  82
  83 struct dhcpv6_client_header {
  84         uint8_t msg_type;
  85         uint8_t transaction_id[3];
  86 } __attribute__((packed));
  87
  88 struct dhcpv6_relay_header {
  89         uint8_t msg_type;
  90         uint8_t hop_count;
  91         struct in6_addr link_address;
  92         struct in6_addr peer_address;
  93         uint8_t options[];
  94 } __attribute__((packed));
  95
  96 struct dhcpv6_relay_forward_envelope {
  97         uint8_t msg_type;
  98         uint8_t hop_count;
  99         struct in6_addr link_address;
 100         struct in6_addr peer_address;
 101         uint16_t interface_id_type;
 102         uint16_t interface_id_len;
 103         uint32_t interface_id_data;
 104         uint16_t relay_message_type;
 105         uint16_t relay_message_len;
 106 } __attribute__((packed));
 107
 108 struct dhcpv6_auth_reconfigure {
 109         uint16_t type;
 110         uint16_t len;
 111         uint8_t protocol;
 112         uint8_t algorithm;
 113         uint8_t rdm;
 114         uint32_t replay[2];
 115         uint8_t reconf_type;
 116         uint8_t key[16];
 117 } _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_prefix {
 128         uint16_t type;
 129         uint16_t len;
 130         uint32_t preferred;
 131         uint32_t valid;
 132         uint8_t prefix;
 133         struct in6_addr addr;
 134 } _packed;
 135
 136 struct dhcpv6_ia_addr {
 137         uint16_t type;
 138         uint16_t len;
 139         struct in6_addr addr;
 140         uint32_t preferred;
 141         uint32_t valid;
 142 } _packed;
 143
 144 struct dhcpv6_assignment {
 145         struct list_head head;
 146         struct sockaddr_in6 peer;
 147         time_t valid_until;
 148         time_t reconf_sent;
 149         bool all_class;
 150         uint8_t classes_cnt;
 151         uint16_t *classes;
 152         int reconf_cnt;
 153         char *hostname;
 154         uint8_t key[16];
 155         uint32_t assigned;
 156         uint32_t iaid;
 157         uint8_t mac[6];
 158         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 159         bool accept_reconf;
 160
 161         struct odhcpd_ipaddr *managed;
 162         ssize_t managed_size;
 163         struct ustream_fd managed_sock;
 164
 165         uint8_t clid_len;
 166         uint8_t clid_data[];
 167 };
 168
 169 struct dhcpv6_cer_id {
 170         uint16_t type;
 171         uint16_t len;
 172         uint16_t reserved;
 173         uint16_t auth_type;
 174         uint8_t auth[16];
 175         struct in6_addr addr;
 176 };
 177
 178
 179
 180 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 181         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (end) &&\
 182                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 183                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (end); \
 184                 _o += 4 + (_o[2] << 8 | _o[3]))
 185
 186 int dhcpv6_init_ia(struct interface *iface, int socket);
 187 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
 188                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
 189 int dhcpv6_ia_init(void);
 190 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable);
 191 void dhcpv6_write_statefile(void);