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_DNS_SERVERS = 23,
58 DHCPV6_OPT_DNS_DOMAIN = 24,
59 DHCPV6_OPT_IA_PD = 25,
60 DHCPV6_OPT_IA_PREFIX = 26,
61 DHCPV6_OPT_SNTP_SERVERS = 31,
62 DHCPV6_OPT_INFO_REFRESH = 32,
64 DHCPV6_OPT_NTP_SERVER = 56,
65 DHCPV6_OPT_SIP_SERVER_D = 21,
66 DHCPV6_OPT_SIP_SERVER_A = 22,
67 DHCPV6_OPT_AFTR_NAME = 64,
68 DHCPV6_OPT_PD_EXCLUDE = 67,
69 DHCPV6_OPT_SOL_MAX_RT = 82,
70 DHCPV6_OPT_INF_MAX_RT = 83,
72 /* draft-donley-dhc-cer-id-option-03 */
73 DHCPV6_OPT_CER_ID = EXT_CER_ID,
75 /* draft-ietf-softwire-map-dhcp-08 */
76 DHCPV6_OPT_S46_RULE = 89,
77 DHCPV6_OPT_S46_BR = 90,
78 DHCPV6_OPT_S46_DMR = 91,
79 DHCPV6_OPT_S46_V4V6BIND = 92,
80 DHCPV6_OPT_S46_PORTPARAMS = 93,
81 DHCPV6_OPT_S46_CONT_MAPE = 94,
82 DHCPV6_OPT_S46_CONT_MAPT = 95,
83 DHCPV6_OPT_S46_CONT_LW = 96,
93 DHCPV6_MSG_UNKNOWN = 0,
94 DHCPV6_MSG_SOLICIT = 1,
95 DHCPV6_MSG_ADVERT = 2,
96 DHCPV6_MSG_REQUEST = 3,
98 DHCPV6_MSG_REBIND = 6,
100 DHCPV6_MSG_RELEASE = 8,
101 DHCPV6_MSG_DECLINE = 9,
102 DHCPV6_MSG_RECONF = 10,
103 DHCPV6_MSG_INFO_REQ = 11,
109 DHCPV6_UnspecFail = 1,
110 DHCPV6_NoAddrsAvail = 2,
111 DHCPV6_NoBinding = 3,
112 DHCPV6_NotOnLink = 4,
113 DHCPV6_UseMulticast = 5,
114 DHCPV6_NoPrefixAvail = 6,
119 DHCPV6_STRICT_OPTIONS = 1,
120 DHCPV6_CLIENT_FQDN = 2,
121 DHCPV6_ACCEPT_RECONFIGURE = 4,
124 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
125 const void *opt, const void *end, const struct sockaddr_in6 *from);
127 // retransmission strategy
134 reply_handler *handler_reply;
135 int(*handler_finish)(void);
138 // DHCPv6 Protocol Headers
139 struct dhcpv6_header {
142 } __attribute__((packed));
144 struct dhcpv6_ia_hdr {
152 struct dhcpv6_ia_addr {
155 struct in6_addr addr;
160 struct dhcpv6_ia_prefix {
166 struct in6_addr addr;
176 struct dhcpv6_auth_reconfigure {
187 struct dhcpv6_cer_id {
190 struct in6_addr addr;
193 struct dhcpv6_s46_portparams {
199 struct dhcpv6_s46_v4v6bind {
200 struct in_addr ipv4_address;
201 uint8_t bindprefix6_len;
202 uint8_t bind_ipv6_prefix[];
205 struct dhcpv6_s46_dmr {
206 uint8_t dmr_prefix6_len;
207 uint8_t dmr_ipv6_prefix[];
210 struct dhcpv6_s46_rule {
214 struct in_addr ipv4_prefix;
216 uint8_t ipv6_prefix[];
219 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
220 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
221 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
222 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
223 _o += 4 + (_o[2] << 8 | _o[3]))
226 struct dhcpv6_server_cand {
227 bool has_noaddravail;
228 bool wants_reconfigure;
232 struct in6_addr server_addr;
288 RA_RDNSS_DEFAULT_LIFETIME = 1,
291 enum odhcp6c_ia_mode {
298 struct odhcp6c_entry {
299 struct in6_addr router;
303 struct in6_addr target;
312 // Include padding after auxtarget to align the next entry
313 #define odhcp6c_entry_size(entry) \
314 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
316 #define odhcp6c_next_entry(entry) \
317 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
320 struct odhcp6c_request_prefix {
325 enum odhcp6c_opt_flags {
330 OPT_MASK_SIZE = 0x0F,
333 OPT_NO_PASSTHRU = 0x40,
342 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
343 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
344 int dhcpv6_request(enum dhcpv6_msg type);
345 int dhcpv6_poll_reconfigure(void);
346 int dhcpv6_promote_server_cand(void);
348 int init_rtnetlink(void);
349 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
350 uint32_t pref, uint32_t valid);
352 int ra_conf_hoplimit(int newvalue);
353 int ra_conf_mtu(int newvalue);
354 int ra_conf_reachable(int newvalue);
355 int ra_conf_retransmit(int newvalue);
357 int script_init(const char *path, const char *ifname);
358 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
359 void script_call(const char *status, int delay, bool resume);
361 bool odhcp6c_signal_process(void);
362 uint64_t odhcp6c_get_milli_time(void);
363 int odhcp6c_random(void *buf, size_t len);
364 bool odhcp6c_is_bound(void);
365 bool odhcp6c_addr_in_scope(const struct in6_addr *addr);
367 // State manipulation
368 void odhcp6c_clear_state(enum odhcp6c_state state);
369 int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
370 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
371 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
372 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
373 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
374 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
376 // Entry manipulation
377 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new,
378 uint32_t safe, unsigned int holdoff_interval);
380 void odhcp6c_expire(void);
381 uint32_t odhcp6c_elapsed(void);
382 struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code);