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 #include "odhcpd.h"
  18
  19 #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  20                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}}
  21
  22 #define ALL_DHCPV6_SERVERS {{{0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  23                 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x03}}}
  24
  25 #define DHCPV6_CLIENT_PORT 546
  26 #define DHCPV6_SERVER_PORT 547
  27
  28 #define DHCPV6_MSG_SOLICIT 1
  29 #define DHCPV6_MSG_ADVERTISE 2
  30 #define DHCPV6_MSG_REQUEST 3
  31 #define DHCPV6_MSG_CONFIRM 4
  32 #define DHCPV6_MSG_RENEW 5
  33 #define DHCPV6_MSG_REBIND 6
  34 #define DHCPV6_MSG_REPLY 7
  35 #define DHCPV6_MSG_RELEASE 8
  36 #define DHCPV6_MSG_DECLINE 9
  37 #define DHCPV6_MSG_RECONFIGURE 10
  38 #define DHCPV6_MSG_INFORMATION_REQUEST 11
  39 #define DHCPV6_MSG_RELAY_FORW 12
  40 #define DHCPV6_MSG_RELAY_REPL 13
  41
  42 #define DHCPV6_OPT_CLIENTID 1
  43 #define DHCPV6_OPT_SERVERID 2
  44 #define DHCPV6_OPT_IA_NA 3
  45 #define DHCPV6_OPT_IA_ADDR 5
  46 #define DHCPV6_OPT_ORO 6
  47 #define DHCPV6_OPT_STATUS 13
  48 #define DHCPV6_OPT_RELAY_MSG 9
  49 #define DHCPV6_OPT_AUTH 11
  50 #define DHCPV6_OPT_USER_CLASS 15
  51 #define DHCPV6_OPT_INTERFACE_ID 18
  52 #define DHCPV6_OPT_RECONF_MSG 19
  53 #define DHCPV6_OPT_RECONF_ACCEPT 20
  54 #define DHCPV6_OPT_DNS_SERVERS 23
  55 #define DHCPV6_OPT_DNS_DOMAIN 24
  56 #define DHCPV6_OPT_IA_PD 25
  57 #define DHCPV6_OPT_IA_PREFIX 26
  58 #define DHCPV6_OPT_INFO_REFRESH 32
  59 #define DHCPV6_OPT_FQDN 39
  60 #define DHCPV6_OPT_SOL_MAX_RT 82
  61 #define DHCPV6_OPT_INF_MAX_RT 83
  62
  63 #define DHCPV6_DUID_VENDOR 2
  64
  65 #define DHCPV6_STATUS_OK 0
  66 #define DHCPV6_STATUS_NOADDRSAVAIL 2
  67 #define DHCPV6_STATUS_NOBINDING 3
  68 #define DHCPV6_STATUS_NOTONLINK 4
  69 #define DHCPV6_STATUS_USEMULTICAST 5
  70 #define DHCPV6_STATUS_NOPREFIXAVAIL 6
  71
  72 // I just remembered I have an old one lying around...
  73 #define DHCPV6_ENT_NO  30462
  74 #define DHCPV6_ENT_TYPE 1
  75
  76
  77 #define DHCPV6_HOP_COUNT_LIMIT 32
  78
  79 struct dhcpv6_client_header {
  80         uint8_t msg_type;
  81         uint8_t transaction_id[3];
  82 } __attribute__((packed));
  83
  84 struct dhcpv6_relay_header {
  85         uint8_t msg_type;
  86         uint8_t hop_count;
  87         struct in6_addr link_address;
  88         struct in6_addr peer_address;
  89         uint8_t options[];
  90 } __attribute__((packed));
  91
  92 struct dhcpv6_relay_forward_envelope {
  93         uint8_t msg_type;
  94         uint8_t hop_count;
  95         struct in6_addr link_address;
  96         struct in6_addr peer_address;
  97         uint16_t interface_id_type;
  98         uint16_t interface_id_len;
  99         uint32_t interface_id_data;
 100         uint16_t relay_message_type;
 101         uint16_t relay_message_len;
 102 } __attribute__((packed));
 103
 104 struct dhcpv6_auth_reconfigure {
 105         uint16_t type;
 106         uint16_t len;
 107         uint8_t protocol;
 108         uint8_t algorithm;
 109         uint8_t rdm;
 110         uint32_t replay[2];
 111         uint8_t reconf_type;
 112         uint8_t key[16];
 113 } _packed;
 114
 115 struct dhcpv6_ia_hdr {
 116         uint16_t type;
 117         uint16_t len;
 118         uint32_t iaid;
 119         uint32_t t1;
 120         uint32_t t2;
 121 } _packed;
 122
 123 struct dhcpv6_ia_prefix {
 124         uint16_t type;
 125         uint16_t len;
 126         uint32_t preferred;
 127         uint32_t valid;
 128         uint8_t prefix;
 129         struct in6_addr addr;
 130 } _packed;
 131
 132 struct dhcpv6_ia_addr {
 133         uint16_t type;
 134         uint16_t len;
 135         struct in6_addr addr;
 136         uint32_t preferred;
 137         uint32_t valid;
 138 } _packed;
 139
 140 struct dhcpv6_assignment {
 141         struct list_head head;
 142         struct sockaddr_in6 peer;
 143         time_t valid_until;
 144         time_t reconf_sent;
 145         int reconf_cnt;
 146         char *hostname;
 147         uint8_t key[16];
 148         uint32_t assigned;
 149         uint32_t iaid;
 150         uint8_t mac[6];
 151         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 152         bool accept_reconf;
 153
 154         struct odhcpd_ipaddr *managed;
 155         ssize_t managed_size;
 156         struct ustream_fd managed_sock;
 157
 158         uint32_t leasetime;
 159         unsigned int flags;
 160
 161         uint8_t clid_len;
 162         uint8_t clid_data[];
 163 };
 164
 165 struct dhcpv6_cer_id {
 166         uint16_t type;
 167         uint16_t len;
 168         uint16_t reserved;
 169         uint16_t auth_type;
 170         uint8_t auth[16];
 171         struct in6_addr addr;
 172 };
 173
 174 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
 175                                                 uint32_t pref, uint32_t valid,
 176                                                 void *arg);
 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_enum_ia_addrs(struct interface *iface, struct dhcpv6_assignment *c, time_t now,
 190                                 dhcpv6_binding_cb_handler_t func, void *arg);
 191 void dhcpv6_write_statefile(void);
 192 void dhcpv6_ia_preupdate(struct interface *iface);
 193 void dhcpv6_ia_postupdate(struct interface *iface, time_t now);