2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
18 #include <netinet/in.h>
20 #define _unused __attribute__((unused))
21 #define _packed __attribute__((packed))
22 #define _aligned(n) __attribute__((aligned(n)))
24 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
26 #define ND_OPT_RECURSIVE_DNS 25
27 #define ND_OPT_DNSSL 31
29 #define DHCPV6_SOL_MAX_RT 120
30 #define DHCPV6_REQ_MAX_RT 30
31 #define DHCPV6_CNF_MAX_RT 4
32 #define DHCPV6_REN_MAX_RT 600
33 #define DHCPV6_REB_MAX_RT 600
34 #define DHCPV6_INF_MAX_RT 120
36 #define RA_MIN_ADV_INTERVAL 3 /* RFC 4861 paragraph 6.2.1 */
39 DHCPV6_OPT_CLIENTID
= 1,
40 DHCPV6_OPT_SERVERID
= 2,
43 DHCPV6_OPT_IA_ADDR
= 5,
46 DHCPV6_OPT_ELAPSED
= 8,
47 DHCPV6_OPT_RELAY_MSG
= 9,
49 DHCPV6_OPT_UNICAST
= 12,
50 DHCPV6_OPT_STATUS
= 13,
51 DHCPV6_OPT_RAPID_COMMIT
= 14,
52 DHCPV6_OPT_USER_CLASS
= 15,
53 DHCPV6_OPT_VENDOR_CLASS
= 16,
54 DHCPV6_OPT_INTERFACE_ID
= 18,
55 DHCPV6_OPT_RECONF_MESSAGE
= 19,
56 DHCPV6_OPT_RECONF_ACCEPT
= 20,
57 DHCPV6_OPT_SIP_SERVER_D
= 21,
58 DHCPV6_OPT_SIP_SERVER_A
= 22,
59 DHCPV6_OPT_DNS_SERVERS
= 23,
60 DHCPV6_OPT_DNS_DOMAIN
= 24,
61 DHCPV6_OPT_IA_PD
= 25,
62 DHCPV6_OPT_IA_PREFIX
= 26,
63 DHCPV6_OPT_SNTP_SERVERS
= 31,
64 DHCPV6_OPT_INFO_REFRESH
= 32,
65 DHCPV6_OPT_REMOTE_ID
= 37,
66 DHCPV6_OPT_SUBSCRIBER_ID
= 38,
69 DHCPV6_OPT_LQ_QUERY
= 44,
70 DHCPV6_OPT_CLIENT_DATA
= 45,
71 DHCPV6_OPT_CLT_TIME
= 46,
72 DHCPV6_OPT_LQ_RELAY_DATA
= 47,
73 DHCPV6_OPT_LQ_CLIENT_LINK
= 48,
74 DHCPV6_OPT_RELAY_ID
= 53,
75 DHCPV6_OPT_NTP_SERVER
= 56,
76 DHCPV6_OPT_CLIENT_ARCH_TYPE
= 61,
77 DHCPV6_OPT_AFTR_NAME
= 64,
79 DHCPV6_OPT_PD_EXCLUDE
= 67,
81 DHCPV6_OPT_LINK_LAYER_ADDRESS
= 79,
82 DHCPV6_OPT_LINK_ADDRESS
= 80,
83 DHCPV6_OPT_RADIUS
= 81,
84 DHCPV6_OPT_SOL_MAX_RT
= 82,
85 DHCPV6_OPT_INF_MAX_RT
= 83,
87 /* draft-donley-dhc-cer-id-option-03 */
88 DHCPV6_OPT_CER_ID
= EXT_CER_ID
,
90 DHCPV6_OPT_DHCPV4_MSG
= 87,
91 /* draft-ietf-softwire-map-dhcp-08 */
92 DHCPV6_OPT_S46_RULE
= 89,
93 DHCPV6_OPT_S46_BR
= 90,
94 DHCPV6_OPT_S46_DMR
= 91,
95 DHCPV6_OPT_S46_V4V6BIND
= 92,
96 DHCPV6_OPT_S46_PORTPARAMS
= 93,
97 DHCPV6_OPT_S46_CONT_MAPE
= 94,
98 DHCPV6_OPT_S46_CONT_MAPT
= 95,
99 DHCPV6_OPT_S46_CONT_LW
= 96,
100 DHCPV6_OPT_LQ_BASE_TIME
= 100,
101 DHCPV6_OPT_LQ_START_TIME
= 101,
102 DHCPV6_OPT_LQ_END_TIME
= 102,
103 DHCPV6_OPT_ANI_ATT
= 105,
104 DHCPV6_OPT_ANI_NETWORK_NAME
= 106,
105 DHCPV6_OPT_ANI_AP_NAME
= 107,
106 DHCPV6_OPT_ANI_AP_BSSID
= 108,
107 DHCPV6_OPT_ANI_OPERATOR_ID
= 109,
108 DHCPV6_OPT_ANI_OPERATOR_REALM
= 110,
109 DHCPV6_OPT_MUD_URL_V6
= 112,
110 DHCPV6_OPT_F_BINDING_STATUS
= 114,
111 DHCPV6_OPT_F_CONNECT_FLAGS
= 115,
112 DHCPV6_OPT_F_DNS_REMOVAL_INFO
= 116,
113 DHCPV6_OPT_F_DNS_HOST_NAME
= 117,
114 DHCPV6_OPT_F_DNS_ZONE_NAME
= 118,
115 DHCPV6_OPT_F_DNS_FLAGS
= 119,
116 DHCPV6_OPT_F_EXPIRATION_TIME
= 120,
117 DHCPV6_OPT_F_MAX_UNACKED_BNDUPD
= 121,
118 DHCPV6_OPT_F_MCLT
= 122,
119 DHCPV6_OPT_F_PARTNER_LIFETIME
= 123,
120 DHCPV6_OPT_F_PARTNER_LIFETIME_SENT
= 124,
121 DHCPV6_OPT_F_PARTNER_DOWN_TIME
= 125,
122 DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME
= 126,
123 DHCPV6_OPT_F_PROTOCOL_VERSION
= 127,
124 DHCPV6_OPT_F_KEEPALIVE_TIME
= 128,
125 DHCPV6_OPT_F_RECONFIGURE_DATA
= 129,
126 DHCPV6_OPT_F_RELATIONSHIP_NAME
= 130,
127 DHCPV6_OPT_F_SERVER_FLAGS
= 131,
128 DHCPV6_OPT_F_SERVER_STATE
= 132,
129 DHCPV6_OPT_F_START_TIME_OF_STATE
= 133,
130 DHCPV6_OPT_F_STATE_EXPIRATION_TIME
= 134,
131 DHCPV6_OPT_RELAY_PORT
= 135,
134 enum dhcpv6_opt_npt
{
141 DHCPV6_MSG_UNKNOWN
= 0,
142 DHCPV6_MSG_SOLICIT
= 1,
143 DHCPV6_MSG_ADVERT
= 2,
144 DHCPV6_MSG_REQUEST
= 3,
145 DHCPV6_MSG_RENEW
= 5,
146 DHCPV6_MSG_REBIND
= 6,
147 DHCPV6_MSG_REPLY
= 7,
148 DHCPV6_MSG_RELEASE
= 8,
149 DHCPV6_MSG_DECLINE
= 9,
150 DHCPV6_MSG_RECONF
= 10,
151 DHCPV6_MSG_INFO_REQ
= 11,
157 DHCPV6_UnspecFail
= 1,
158 DHCPV6_NoAddrsAvail
= 2,
159 DHCPV6_NoBinding
= 3,
160 DHCPV6_NotOnLink
= 4,
161 DHCPV6_UseMulticast
= 5,
162 DHCPV6_NoPrefixAvail
= 6,
167 DHCPV6_STRICT_OPTIONS
= 1,
168 DHCPV6_CLIENT_FQDN
= 2,
169 DHCPV6_ACCEPT_RECONFIGURE
= 4,
170 DHCPV6_IGNORE_OPT_UNICAST
= 8,
173 typedef int(reply_handler
)(enum dhcpv6_msg orig
, const int rc
,
174 const void *opt
, const void *end
, const struct sockaddr_in6
*from
);
176 // retransmission strategy
183 reply_handler
*handler_reply
;
184 int(*handler_finish
)(void);
187 // DHCPv6 Protocol Headers
188 struct dhcpv6_header
{
191 } __attribute__((packed
));
193 struct dhcpv6_ia_hdr
{
201 struct dhcpv6_ia_addr
{
204 struct in6_addr addr
;
209 struct dhcpv6_ia_prefix
{
215 struct in6_addr addr
;
225 struct dhcpv6_auth_reconfigure
{
236 struct dhcpv6_cer_id
{
239 struct in6_addr addr
;
242 struct dhcpv6_s46_portparams
{
248 struct dhcpv6_s46_v4v6bind
{
249 struct in_addr ipv4_address
;
250 uint8_t bindprefix6_len
;
251 uint8_t bind_ipv6_prefix
[];
254 struct dhcpv6_s46_dmr
{
255 uint8_t dmr_prefix6_len
;
256 uint8_t dmr_ipv6_prefix
[];
259 struct dhcpv6_s46_rule
{
263 struct in_addr ipv4_prefix
;
265 uint8_t ipv6_prefix
[];
268 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
269 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
270 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
271 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
272 _o += 4 + (_o[2] << 8 | _o[3]))
275 struct dhcpv6_server_cand
{
276 bool has_noaddravail
;
277 bool wants_reconfigure
;
281 struct in6_addr server_addr
;
337 RA_RDNSS_DEFAULT_LIFETIME
= 1,
340 enum odhcp6c_ia_mode
{
347 struct odhcp6c_entry
{
348 struct in6_addr router
;
351 struct in6_addr target
;
361 // Include padding after auxtarget to align the next entry
362 #define odhcp6c_entry_size(entry) \
363 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
365 #define odhcp6c_next_entry(entry) \
366 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
369 struct odhcp6c_request_prefix
{
374 enum odhcp6c_opt_flags
{
380 OPT_MASK_SIZE
= 0x0F,
383 OPT_NO_PASSTHRU
= 0x40,
385 OPT_ORO_STATEFUL
= 0x100,
386 OPT_ORO_STATELESS
= 0x200,
387 OPT_ORO_SOLICIT
= 0x400
396 int init_dhcpv6(const char *ifname
, unsigned int client_options
, int sol_timeout
, unsigned int ia_pd_safe_valid
);
397 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na
, enum odhcp6c_ia_mode pd
);
398 int dhcpv6_request(enum dhcpv6_msg type
);
399 int dhcpv6_poll_reconfigure(void);
400 int dhcpv6_promote_server_cand(void);
402 int init_rtnetlink(void);
403 int set_rtnetlink_addr(int ifindex
, const struct in6_addr
*addr
,
404 uint32_t pref
, uint32_t valid
);
406 int ra_get_hoplimit(void);
407 int ra_get_mtu(void);
408 int ra_get_reachable(void);
409 int ra_get_retransmit(void);
411 int script_init(const char *path
, const char *ifname
);
412 ssize_t
script_unhexlify(uint8_t *dst
, size_t len
, const char *src
);
413 void script_call(const char *status
, int delay
, bool resume
);
415 bool odhcp6c_signal_process(void);
416 uint64_t odhcp6c_get_milli_time(void);
417 int odhcp6c_random(void *buf
, size_t len
);
418 bool odhcp6c_is_bound(void);
419 bool odhcp6c_addr_in_scope(const struct in6_addr
*addr
);
421 // State manipulation
422 void odhcp6c_clear_state(enum odhcp6c_state state
);
423 int odhcp6c_add_state(enum odhcp6c_state state
, const void *data
, size_t len
);
424 void odhcp6c_append_state(enum odhcp6c_state state
, const void *data
, size_t len
);
425 int odhcp6c_insert_state(enum odhcp6c_state state
, size_t offset
, const void *data
, size_t len
);
426 size_t odhcp6c_remove_state(enum odhcp6c_state state
, size_t offset
, size_t len
);
427 void* odhcp6c_move_state(enum odhcp6c_state state
, size_t *len
);
428 void* odhcp6c_get_state(enum odhcp6c_state state
, size_t *len
);
430 // Entry manipulation
431 bool odhcp6c_update_entry(enum odhcp6c_state state
, struct odhcp6c_entry
*new,
432 uint32_t safe
, unsigned int holdoff_interval
);
434 void odhcp6c_expire(void);
435 uint32_t odhcp6c_elapsed(void);
436 struct odhcp6c_opt
*odhcp6c_find_opt(const uint16_t code
);