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/**
* Copyright (C) 2012 Steven Barth <steven@midlink.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <netinet/in.h>
#define _unused __attribute__((unused))
#define _packed __attribute__((packed))
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
#define ND_OPT_RECURSIVE_DNS 25
#define ND_OPT_DNSSL 31
enum dhcvp6_opt {
DHCPV6_OPT_CLIENTID = 1,
DHCPV6_OPT_SERVERID = 2,
DHCPV6_OPT_IA_NA = 3,
DHCPV6_OPT_IA_ADDR = 5,
DHCPV6_OPT_ORO = 6,
DHCPV6_OPT_PREF = 7,
DHCPV6_OPT_ELAPSED = 8,
DHCPV6_OPT_RELAY_MSG = 9,
DHCPV6_OPT_AUTH = 11,
DHCPV6_OPT_STATUS = 13,
DHCPV6_OPT_RAPID_COMMIT = 14,
DHCPV6_OPT_RECONF_MESSAGE = 19,
DHCPV6_OPT_RECONF_ACCEPT = 20,
DHCPV6_OPT_DNS_SERVERS = 23,
DHCPV6_OPT_DNS_DOMAIN = 24,
DHCPV6_OPT_IA_PD = 25,
DHCPV6_OPT_IA_PREFIX = 26,
DHCPV6_OPT_INFO_REFRESH = 32,
DHCPV6_OPT_FQDN = 39,
};
enum dhcpv6_msg {
DHCPV6_MSG_UNKNOWN = 0,
DHCPV6_MSG_SOLICIT = 1,
DHCPV6_MSG_ADVERT = 2,
DHCPV6_MSG_REQUEST = 3,
DHCPV6_MSG_RENEW = 5,
DHCPV6_MSG_REBIND = 6,
DHCPV6_MSG_REPLY = 7,
DHCPV6_MSG_RELEASE = 8,
DHCPV6_MSG_DECLINE = 9,
DHCPV6_MSG_RECONF = 10,
DHCPV6_MSG_INFO_REQ = 11,
_DHCPV6_MSG_MAX
};
enum dhcpv6_status {
DHCPV6_NoAddrsAvail = 2,
DHCPV6_NoPrefixAvail = 6,
};
typedef int(reply_handler)(enum dhcpv6_msg orig,
const void *opt, const void *end, uint32_t elapsed);
// retransmission strategy
struct dhcpv6_retx {
bool delay;
uint8_t init_timeo;
uint16_t max_timeo;
char name[8];
reply_handler *handler_reply;
int(*handler_finish)(uint32_t elapsed);
};
// DHCPv6 Protocol Headers
struct dhcpv6_header {
uint8_t msg_type;
uint8_t tr_id[3];
} __attribute__((packed));
struct dhcpv6_ia_hdr {
uint16_t type;
uint16_t len;
uint32_t iaid;
uint32_t t1;
uint32_t t2;
} _packed;
struct dhcpv6_ia_addr {
uint16_t type;
uint16_t len;
struct in6_addr addr;
uint32_t preferred;
uint32_t valid;
} _packed;
struct dhcpv6_ia_prefix {
uint16_t type;
uint16_t len;
uint32_t preferred;
uint32_t valid;
uint8_t prefix;
struct in6_addr addr;
} _packed;
struct dhcpv6_duid {
uint16_t type;
uint16_t len;
uint16_t duid_type;
uint8_t data[128];
} _packed;
#define dhcpv6_for_each_option(start, end, otype, olen, odata)\
for (uint8_t *_o = (uint8_t*)(start); _o + 4 <= (uint8_t*)(end) &&\
((otype) = _o[0] << 8 | _o[1]) && ((odata) = (void*)&_o[4]) &&\
((olen) = _o[2] << 8 | _o[3]) + (odata) <= (uint8_t*)(end); \
_o += 4 + (_o[2] << 8 | _o[3]))
struct dhcpv6_server_cand {
bool has_noaddravail;
bool wants_reconfigure;
int16_t preference;
uint8_t duid_len;
uint8_t duid[130];
};
enum odhcp6c_state {
STATE_CLIENT_ID,
STATE_SERVER_ID,
STATE_SERVER_CAND,
STATE_ORO,
STATE_DNS,
STATE_SEARCH,
STATE_IA_NA,
STATE_IA_PD,
STATE_IA_PD_LOST,
STATE_CUSTOM_OPTS,
_STATE_MAX
};
struct icmp6_opt {
uint8_t type;
uint8_t len;
uint8_t data[6];
};
enum dhcpv6_mode {
DHCPV6_UNKNOWN,
DHCPV6_STATELESS,
DHCPV6_STATEFUL
};
enum odhcp6c_ia_mode {
IA_MODE_NONE,
IA_MODE_TRY,
IA_MODE_FORCE,
};
int init_dhcpv6(const char *ifname, int request_pd);
void dhcpv6_set_ia_na_mode(enum odhcp6c_ia_mode mode);
int dhcpv6_request(enum dhcpv6_msg type);
int dhcpv6_poll_reconfigure(void);
void dhcpv6_remove_addrs(void);
int init_rtnetlink(void);
int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr,
time_t pref, time_t valid);
int script_init(const char *path, const char *ifname);
ssize_t script_unhexlify(uint8_t *dst, size_t len, const char *src);
void script_call(const char *status);
// State manipulation
bool odhcp6c_signal_is_pending(void);
uint64_t adhc6c_get_milli_time(void);
void odhcp6c_clear_state(enum odhcp6c_state state);
void odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len);
size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len);
bool odhcp6c_commit_state(enum odhcp6c_state state, size_t old_len);
void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len);
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