2 * Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License v2 as published by
6 * the Free Software Foundation.
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 for more details.
17 #include <netinet/in.h>
19 #define _unused __attribute__((unused))
20 #define _packed __attribute__((packed))
21 #define _aligned(n) __attribute__((aligned(n)))
23 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
25 #define ND_OPT_RECURSIVE_DNS 25
26 #define ND_OPT_DNSSL 31
28 #define DHCPV6_SOL_MAX_RT 120
29 #define DHCPV6_REQ_MAX_RT 30
30 #define DHCPV6_CNF_MAX_RT 4
31 #define DHCPV6_REN_MAX_RT 600
32 #define DHCPV6_REB_MAX_RT 600
33 #define DHCPV6_INF_MAX_RT 120
35 #define DEFAULT_MIN_UPDATE_INTERVAL 30
38 DHCPV6_OPT_CLIENTID = 1,
39 DHCPV6_OPT_SERVERID = 2,
42 DHCPV6_OPT_IA_ADDR = 5,
45 DHCPV6_OPT_ELAPSED = 8,
46 DHCPV6_OPT_RELAY_MSG = 9,
48 DHCPV6_OPT_UNICAST = 12,
49 DHCPV6_OPT_STATUS = 13,
50 DHCPV6_OPT_RAPID_COMMIT = 14,
51 DHCPV6_OPT_USER_CLASS = 15,
52 DHCPV6_OPT_VENDOR_CLASS = 16,
53 DHCPV6_OPT_RECONF_MESSAGE = 19,
54 DHCPV6_OPT_RECONF_ACCEPT = 20,
55 DHCPV6_OPT_DNS_SERVERS = 23,
56 DHCPV6_OPT_DNS_DOMAIN = 24,
57 DHCPV6_OPT_IA_PD = 25,
58 DHCPV6_OPT_IA_PREFIX = 26,
59 DHCPV6_OPT_SNTP_SERVERS = 31,
60 DHCPV6_OPT_INFO_REFRESH = 32,
62 DHCPV6_OPT_NTP_SERVER = 56,
63 DHCPV6_OPT_SIP_SERVER_D = 21,
64 DHCPV6_OPT_SIP_SERVER_A = 22,
65 DHCPV6_OPT_AFTR_NAME = 64,
66 DHCPV6_OPT_PD_EXCLUDE = 67,
67 DHCPV6_OPT_SOL_MAX_RT = 82,
68 DHCPV6_OPT_INF_MAX_RT = 83,
70 /* draft-donley-dhc-cer-id-option-03 */
71 DHCPV6_OPT_CER_ID = EXT_CER_ID,
73 /* draft-ietf-softwire-map-dhcp-08 */
74 DHCPV6_OPT_S46_RULE = 89,
75 DHCPV6_OPT_S46_BR = 90,
76 DHCPV6_OPT_S46_DMR = 91,
77 DHCPV6_OPT_S46_V4V6BIND = 92,
78 DHCPV6_OPT_S46_PORTPARAMS = 93,
79 DHCPV6_OPT_S46_CONT_MAPE = 94,
80 DHCPV6_OPT_S46_CONT_MAPT = 95,
81 DHCPV6_OPT_S46_CONT_LW = 96,
91 DHCPV6_MSG_UNKNOWN = 0,
92 DHCPV6_MSG_SOLICIT = 1,
93 DHCPV6_MSG_ADVERT = 2,
94 DHCPV6_MSG_REQUEST = 3,
96 DHCPV6_MSG_REBIND = 6,
98 DHCPV6_MSG_RELEASE = 8,
99 DHCPV6_MSG_DECLINE = 9,
100 DHCPV6_MSG_RECONF = 10,
101 DHCPV6_MSG_INFO_REQ = 11,
107 DHCPV6_UnspecFail = 1,
108 DHCPV6_NoAddrsAvail = 2,
109 DHCPV6_NoBinding = 3,
110 DHCPV6_NotOnLink = 4,
111 DHCPV6_UseMulticast = 5,
112 DHCPV6_NoPrefixAvail = 6,
117 DHCPV6_STRICT_OPTIONS = 1,
118 DHCPV6_CLIENT_FQDN = 2,
119 DHCPV6_ACCEPT_RECONFIGURE = 4,
122 typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc,
123 const void *opt, const void *end, const struct sockaddr_in6 *from);
125 // retransmission strategy
132 reply_handler *handler_reply;
133 int(*handler_finish)(void);
136 // DHCPv6 Protocol Headers
137 struct dhcpv6_header {
140 } __attribute__((packed));
142 struct dhcpv6_ia_hdr {
150 struct dhcpv6_ia_addr {
153 struct in6_addr addr;
158 struct dhcpv6_ia_prefix {
164 struct in6_addr addr;
174 struct dhcpv6_auth_reconfigure {
185 struct dhcpv6_cer_id {
188 struct in6_addr addr;
191 struct dhcpv6_s46_portparams {
197 struct dhcpv6_s46_v4v6bind {
198 struct in_addr ipv4_address;
199 uint8_t bindprefix6_len;
200 uint8_t bind_ipv6_prefix[];
203 struct dhcpv6_s46_dmr {
204 uint8_t dmr_prefix6_len;
205 uint8_t dmr_ipv6_prefix[];
208 struct dhcpv6_s46_rule {
212 struct in_addr ipv4_prefix;
214 uint8_t ipv6_prefix[];
217 #define dhcpv6_for_each_option(start, end, otype, olen, odata)\
218 for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
219 ((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
220 ((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
221 _o += 4 + (_o[2] << 8 | _o[3]))
224 struct dhcpv6_server_cand {
225 bool has_noaddravail;
226 bool wants_reconfigure;
230 struct in6_addr server_addr;
287 RA_RDNSS_DEFAULT_LIFETIME = 1,
290 enum odhcp6c_ia_mode {
297 struct odhcp6c_entry {
298 struct in6_addr router;
302 struct in6_addr target;
311 // Include padding after auxtarget to align the next entry
312 #define odhcp6c_entry_size(entry) \
313 (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3))
315 #define odhcp6c_next_entry(entry) \
316 ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry)))
319 struct odhcp6c_request_prefix {
324 int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout);
325 int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd);
326 int dhcpv6_request(enum dhcpv6_msg type);
327 int dhcpv6_poll_reconfigure(void);
328 int dhcpv6_promote_server_cand(void);
330 int init_rtnetlink(void);
331 int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
332 uint32_t pref, uint32_t valid);
334 int ra_conf_hoplimit(int newvalue);
335 int ra_conf_mtu(int newvalue);
336 int ra_conf_reachable(int newvalue);
337 int ra_conf_retransmit(int newvalue);
339 int script_init(const char *path, const char *ifname);
340 ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
341 void script_call(const char *status, int delay, bool resume);
343 bool odhcp6c_signal_process(void);
344 uint64_t odhcp6c_get_milli_time(void);
345 int odhcp6c_random(void *buf, size_t len);
346 bool odhcp6c_is_bound(void);
347 bool odhcp6c_addr_in_scope(const struct in6_addr *addr);
349 // State manipulation
350 void odhcp6c_clear_state(enum odhcp6c_state state);
351 void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
352 void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len);
353 int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len);
354 size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
355 void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len);
356 void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
358 // Entry manipulation
359 bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, bool filterexcess);
361 void odhcp6c_expire(void);
362 uint32_t odhcp6c_elapsed(void);