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
  61 #ifdef EXT_PREFIX_CLASS
  62 /* draft-bhandari-dhc-class-based-prefix, not yet standardized */
  63 #define DHCPV6_OPT_PREFIX_CLASS EXT_PREFIX_CLASS
  64 #endif
  65
  66 #define DHCPV6_DUID_VENDOR 2
  67
  68 #define DHCPV6_STATUS_OK 0
  69 #define DHCPV6_STATUS_NOADDRSAVAIL 2
  70 #define DHCPV6_STATUS_NOBINDING 3
  71 #define DHCPV6_STATUS_NOTONLINK 4
  72 #define DHCPV6_STATUS_NOPREFIXAVAIL 6
  73
  74 // I just remembered I have an old one lying around...
  75 #define DHCPV6_ENT_NO  30462
  76 #define DHCPV6_ENT_TYPE 1
  77
  78
  79 #define DHCPV6_HOP_COUNT_LIMIT 32
  80
  81 struct dhcpv6_client_header {
  82         uint8_t msg_type;
  83         uint8_t transaction_id[3];
  84 } __attribute__((packed));
  85
  86 struct dhcpv6_relay_header {
  87         uint8_t msg_type;
  88         uint8_t hop_count;
  89         struct in6_addr link_address;
  90         struct in6_addr peer_address;
  91         uint8_t options[];
  92 } __attribute__((packed));
  93
  94 struct dhcpv6_relay_forward_envelope {
  95         uint8_t msg_type;
  96         uint8_t hop_count;
  97         struct in6_addr link_address;
  98         struct in6_addr peer_address;
  99         uint16_t interface_id_type;
 100         uint16_t interface_id_len;
 101         uint32_t interface_id_data;
 102         uint16_t relay_message_type;
 103         uint16_t relay_message_len;
 104 } __attribute__((packed));
 105
 106 struct dhcpv6_auth_reconfigure {
 107         uint16_t type;
 108         uint16_t len;
 109         uint8_t protocol;
 110         uint8_t algorithm;
 111         uint8_t rdm;
 112         uint32_t replay[2];
 113         uint8_t reconf_type;
 114         uint8_t key[16];
 115 } _packed;
 116
 117 struct dhcpv6_ia_hdr {
 118         uint16_t type;
 119         uint16_t len;
 120         uint32_t iaid;
 121         uint32_t t1;
 122         uint32_t t2;
 123 } _packed;
 124
 125 struct dhcpv6_ia_prefix {
 126         uint16_t type;
 127         uint16_t len;
 128         uint32_t preferred;
 129         uint32_t valid;
 130         uint8_t prefix;
 131         struct in6_addr addr;
 132 } _packed;
 133
 134 struct dhcpv6_ia_addr {
 135         uint16_t type;
 136         uint16_t len;
 137         struct in6_addr addr;
 138         uint32_t preferred;
 139         uint32_t valid;
 140 } _packed;
 141
 142 struct dhcpv6_assignment {
 143         struct list_head head;
 144         struct sockaddr_in6 peer;
 145         time_t valid_until;
 146         time_t reconf_sent;
 147         bool all_class;
 148         uint8_t classes_cnt;
 149         uint16_t *classes;
 150         int reconf_cnt;
 151         char *hostname;
 152         uint8_t key[16];
 153         uint32_t assigned;
 154         uint32_t iaid;
 155         uint8_t mac[6];
 156         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 157         bool accept_reconf;
 158
 159         struct odhcpd_ipaddr *managed;
 160         ssize_t managed_size;
 161         struct ustream_fd managed_sock;
 162
 163         uint8_t clid_len;
 164         uint8_t clid_data[];
 165 };
 166
 167 struct dhcpv6_cer_id {
 168         uint16_t type;
 169         uint16_t len;
 170         uint16_t reserved;
 171         uint16_t auth_type;
 172         uint8_t auth[16];
 173         struct in6_addr addr;
 174 };
 175
 176
 177
 178 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 179         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (end) &&\
 180                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 181                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (end); \
 182                 _o += 4 + (_o[2] << 8 | _o[3]))
 183
 184 int dhcpv6_init_ia(struct interface *iface, int socket);
 185 ssize_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
 186                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
 187 int dhcpv6_ia_init(void);
 188 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable);
 189 void dhcpv6_write_statefile(void);