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;
352 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);
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);