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 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  17                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
  18
  19 #define ALL_DHCPV6_SERVERS {{{0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  20                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03}}}
  21
  22 #define DHCPV6_CLIENT_PORT 546
  23 #define DHCPV6_SERVER_PORT 547
  24
  25 #define DHCPV6_MSG_SOLICIT 1
  26 #define DHCPV6_MSG_ADVERTISE 2
  27 #define DHCPV6_MSG_REQUEST 3
  28 #define DHCPV6_MSG_CONFIRM 4
  29 #define DHCPV6_MSG_RENEW 5
  30 #define DHCPV6_MSG_REBIND 6
  31 #define DHCPV6_MSG_REPLY 7
  32 #define DHCPV6_MSG_RELEASE 8
  33 #define DHCPV6_MSG_DECLINE 9
  34 #define DHCPV6_MSG_RECONFIGURE 10
  35 #define DHCPV6_MSG_INFORMATION_REQUEST 11
  36 #define DHCPV6_MSG_RELAY_FORW 12
  37 #define DHCPV6_MSG_RELAY_REPL 13
  38
  39 #define DHCPV6_OPT_CLIENTID 1
  40 #define DHCPV6_OPT_SERVERID 2
  41 #define DHCPV6_OPT_IA_NA 3
  42 #define DHCPV6_OPT_IA_ADDR 5
  43 #define DHCPV6_OPT_STATUS 13
  44 #define DHCPV6_OPT_RELAY_MSG 9
  45 #define DHCPV6_OPT_AUTH 11
  46 #define DHCPV6_OPT_INTERFACE_ID 18
  47 #define DHCPV6_OPT_RECONF_MSG 19
  48 #define DHCPV6_OPT_RECONF_ACCEPT 20
  49 #define DHCPV6_OPT_DNS_SERVERS 23
  50 #define DHCPV6_OPT_DNS_DOMAIN 24
  51 #define DHCPV6_OPT_IA_PD 25
  52 #define DHCPV6_OPT_IA_PREFIX 26
  53 #define DHCPV6_OPT_INFO_REFRESH 32
  54 #define DHCPV6_OPT_FQDN 39
  55
  56 #define DHCPV6_DUID_VENDOR 2
  57
  58 #define DHCPV6_STATUS_OK 0
  59 #define DHCPV6_STATUS_NOADDRSAVAIL 2
  60 #define DHCPV6_STATUS_NOBINDING 3
  61 #define DHCPV6_STATUS_NOTONLINK 4
  62 #define DHCPV6_STATUS_NOPREFIXAVAIL 6
  63
  64 // I just remembered I have an old one lying around...
  65 #define DHCPV6_ENT_NO  30462
  66 #define DHCPV6_ENT_TYPE 1
  67
  68
  69 #define DHCPV6_HOP_COUNT_LIMIT 32
  70
  71 struct dhcpv6_client_header {
  72         uint8_t msg_type;
  73         uint8_t transaction_id[3];
  74 } __attribute__((packed));
  75
  76 struct dhcpv6_relay_header {
  77         uint8_t msg_type;
  78         uint8_t hop_count;
  79         struct in6_addr link_address;
  80         struct in6_addr peer_address;
  81         uint8_t options[];
  82 } __attribute__((packed));
  83
  84 struct dhcpv6_relay_forward_envelope {
  85         uint8_t msg_type;
  86         uint8_t hop_count;
  87         struct in6_addr link_address;
  88         struct in6_addr peer_address;
  89         uint16_t interface_id_type;
  90         uint16_t interface_id_len;
  91         uint32_t interface_id_data;
  92         uint16_t relay_message_type;
  93         uint16_t relay_message_len;
  94 } __attribute__((packed));
  95
  96 struct dhcpv6_auth_reconfigure {
  97         uint16_t type;
  98         uint16_t len;
  99         uint8_t protocol;
 100         uint8_t algorithm;
 101         uint8_t rdm;
 102         uint32_t replay[2];
 103         uint8_t reconf_type;
 104         uint8_t key[16];
 105 } _packed;
 106
 107 struct dhcpv6_ia_hdr {
 108         uint16_t type;
 109         uint16_t len;
 110         uint32_t iaid;
 111         uint32_t t1;
 112         uint32_t t2;
 113 } _packed;
 114
 115 struct dhcpv6_ia_prefix {
 116         uint16_t type;
 117         uint16_t len;
 118         uint32_t preferred;
 119         uint32_t valid;
 120         uint8_t prefix;
 121         struct in6_addr addr;
 122 } _packed;
 123
 124 struct dhcpv6_ia_addr {
 125         uint16_t type;
 126         uint16_t len;
 127         struct in6_addr addr;
 128         uint32_t preferred;
 129         uint32_t valid;
 130 } _packed;
 131
 132 struct dhcpv6_assignment {
 133         struct list_head head;
 134         struct sockaddr_in6 peer;
 135         time_t valid_until;
 136         time_t reconf_sent;
 137         int reconf_cnt;
 138         char *hostname;
 139         uint8_t key[16];
 140         uint32_t assigned;
 141         uint32_t iaid;
 142         uint8_t mac[6];
 143         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 144         bool accept_reconf;
 145         uint8_t clid_len;
 146         uint8_t clid_data[];
 147 };
 148
 149
 150
 151 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
 152         for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (end) &&\
 153                 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
 154                 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (end); \
 155                 _o += 4 + (_o[2] << 8 | _o[3]))
 156
 157 int dhcpv6_init_ia(struct interface *iface, int socket);
 158 size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface,
 159                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
 160 int dhcpv6_ia_init(int dhcpv6_socket);
 161 int setup_dhcpv6_ia_interface(struct interface *iface, bool enable);
 162 void dhcpv6_write_statefile(void);