/** * Copyright (C) 2012-2014 Steven Barth * Copyright (C) 2018 Hans Dedecker * * 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 #include #include #define _unused __attribute__((unused)) #define _packed __attribute__((packed)) #define _aligned(n) __attribute__((aligned(n))) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) #define ND_OPT_RECURSIVE_DNS 25 #define ND_OPT_DNSSL 31 #define DHCPV6_SOL_MAX_RT 120 #define DHCPV6_REQ_MAX_RT 30 #define DHCPV6_CNF_MAX_RT 4 #define DHCPV6_REN_MAX_RT 600 #define DHCPV6_REB_MAX_RT 600 #define DHCPV6_INF_MAX_RT 120 #define RA_MIN_ADV_INTERVAL 3 /* RFC 4861 paragraph 6.2.1 */ enum dhcvp6_opt { DHCPV6_OPT_CLIENTID = 1, DHCPV6_OPT_SERVERID = 2, DHCPV6_OPT_IA_NA = 3, DHCPV6_OPT_IA_TA = 4, 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_UNICAST = 12, DHCPV6_OPT_STATUS = 13, DHCPV6_OPT_RAPID_COMMIT = 14, DHCPV6_OPT_USER_CLASS = 15, DHCPV6_OPT_VENDOR_CLASS = 16, DHCPV6_OPT_INTERFACE_ID = 18, DHCPV6_OPT_RECONF_MESSAGE = 19, DHCPV6_OPT_RECONF_ACCEPT = 20, DHCPV6_OPT_SIP_SERVER_D = 21, DHCPV6_OPT_SIP_SERVER_A = 22, DHCPV6_OPT_DNS_SERVERS = 23, DHCPV6_OPT_DNS_DOMAIN = 24, DHCPV6_OPT_IA_PD = 25, DHCPV6_OPT_IA_PREFIX = 26, DHCPV6_OPT_SNTP_SERVERS = 31, DHCPV6_OPT_INFO_REFRESH = 32, DHCPV6_OPT_REMOTE_ID = 37, DHCPV6_OPT_SUBSCRIBER_ID = 38, DHCPV6_OPT_FQDN = 39, DHCPV6_OPT_ERO = 43, DHCPV6_OPT_LQ_QUERY = 44, DHCPV6_OPT_CLIENT_DATA = 45, DHCPV6_OPT_CLT_TIME = 46, DHCPV6_OPT_LQ_RELAY_DATA = 47, DHCPV6_OPT_LQ_CLIENT_LINK = 48, DHCPV6_OPT_RELAY_ID = 53, DHCPV6_OPT_NTP_SERVER = 56, DHCPV6_OPT_CLIENT_ARCH_TYPE = 61, DHCPV6_OPT_AFTR_NAME = 64, DHCPV6_OPT_RSOO = 66, DHCPV6_OPT_PD_EXCLUDE = 67, DHCPV6_OPT_VSS = 68, DHCPV6_OPT_LINK_LAYER_ADDRESS = 79, DHCPV6_OPT_LINK_ADDRESS = 80, DHCPV6_OPT_RADIUS = 81, DHCPV6_OPT_SOL_MAX_RT = 82, DHCPV6_OPT_INF_MAX_RT = 83, #ifdef EXT_CER_ID /* draft-donley-dhc-cer-id-option-03 */ DHCPV6_OPT_CER_ID = EXT_CER_ID, #endif DHCPV6_OPT_DHCPV4_MSG = 87, /* draft-ietf-softwire-map-dhcp-08 */ DHCPV6_OPT_S46_RULE = 89, DHCPV6_OPT_S46_BR = 90, DHCPV6_OPT_S46_DMR = 91, DHCPV6_OPT_S46_V4V6BIND = 92, DHCPV6_OPT_S46_PORTPARAMS = 93, DHCPV6_OPT_S46_CONT_MAPE = 94, DHCPV6_OPT_S46_CONT_MAPT = 95, DHCPV6_OPT_S46_CONT_LW = 96, DHCPV6_OPT_LQ_BASE_TIME = 100, DHCPV6_OPT_LQ_START_TIME = 101, DHCPV6_OPT_LQ_END_TIME = 102, DHCPV6_OPT_ANI_ATT = 105, DHCPV6_OPT_ANI_NETWORK_NAME = 106, DHCPV6_OPT_ANI_AP_NAME = 107, DHCPV6_OPT_ANI_AP_BSSID = 108, DHCPV6_OPT_ANI_OPERATOR_ID = 109, DHCPV6_OPT_ANI_OPERATOR_REALM = 110, DHCPV6_OPT_MUD_URL_V6 = 112, DHCPV6_OPT_F_BINDING_STATUS = 114, DHCPV6_OPT_F_CONNECT_FLAGS = 115, DHCPV6_OPT_F_DNS_REMOVAL_INFO = 116, DHCPV6_OPT_F_DNS_HOST_NAME = 117, DHCPV6_OPT_F_DNS_ZONE_NAME = 118, DHCPV6_OPT_F_DNS_FLAGS = 119, DHCPV6_OPT_F_EXPIRATION_TIME = 120, DHCPV6_OPT_F_MAX_UNACKED_BNDUPD = 121, DHCPV6_OPT_F_MCLT = 122, DHCPV6_OPT_F_PARTNER_LIFETIME = 123, DHCPV6_OPT_F_PARTNER_LIFETIME_SENT = 124, DHCPV6_OPT_F_PARTNER_DOWN_TIME = 125, DHCPV6_OPT_F_PARTNER_RAW_CLT_TIME = 126, DHCPV6_OPT_F_PROTOCOL_VERSION = 127, DHCPV6_OPT_F_KEEPALIVE_TIME = 128, DHCPV6_OPT_F_RECONFIGURE_DATA = 129, DHCPV6_OPT_F_RELATIONSHIP_NAME = 130, DHCPV6_OPT_F_SERVER_FLAGS = 131, DHCPV6_OPT_F_SERVER_STATE = 132, DHCPV6_OPT_F_START_TIME_OF_STATE = 133, DHCPV6_OPT_F_STATE_EXPIRATION_TIME = 134, DHCPV6_OPT_RELAY_PORT = 135, }; enum dhcpv6_opt_npt { NTP_SRV_ADDR = 1, NTP_MC_ADDR = 2, NTP_SRV_FQDN = 3 }; 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_Success = 0, DHCPV6_UnspecFail = 1, DHCPV6_NoAddrsAvail = 2, DHCPV6_NoBinding = 3, DHCPV6_NotOnLink = 4, DHCPV6_UseMulticast = 5, DHCPV6_NoPrefixAvail = 6, _DHCPV6_Status_Max }; enum dhcpv6_config { DHCPV6_STRICT_OPTIONS = 1, DHCPV6_CLIENT_FQDN = 2, DHCPV6_ACCEPT_RECONFIGURE = 4, DHCPV6_IGNORE_OPT_UNICAST = 8, }; typedef int(reply_handler)(enum dhcpv6_msg orig, const int rc, const void *opt, const void *end, const struct sockaddr_in6 *from); // retransmission strategy struct dhcpv6_retx { bool delay; uint8_t init_timeo; uint16_t max_timeo; uint8_t max_rc; char name[8]; reply_handler *handler_reply; int(*handler_finish)(void); }; // 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; struct dhcpv6_auth_reconfigure { uint16_t type; uint16_t len; uint8_t protocol; uint8_t algorithm; uint8_t rdm; uint64_t replay; uint8_t reconf_type; uint8_t key[16]; } _packed; struct dhcpv6_cer_id { uint16_t type; uint16_t len; struct in6_addr addr; } _packed; struct dhcpv6_s46_portparams { uint8_t offset; uint8_t psid_len; uint16_t psid; } _packed; struct dhcpv6_s46_v4v6bind { struct in_addr ipv4_address; uint8_t bindprefix6_len; uint8_t bind_ipv6_prefix[]; } _packed; struct dhcpv6_s46_dmr { uint8_t dmr_prefix6_len; uint8_t dmr_ipv6_prefix[]; } _packed; struct dhcpv6_s46_rule { uint8_t flags; uint8_t ea_len; uint8_t prefix4_len; struct in_addr ipv4_prefix; uint8_t prefix6_len; uint8_t ipv6_prefix[]; } _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]; struct in6_addr server_addr; uint32_t sol_max_rt; uint32_t inf_max_rt; void *ia_na; void *ia_pd; size_t ia_na_len; size_t ia_pd_len; }; enum odhcp6c_state { STATE_CLIENT_ID, STATE_SERVER_ID, STATE_SERVER_CAND, STATE_SERVER_ADDR, STATE_ORO, STATE_DNS, STATE_SEARCH, STATE_IA_NA, STATE_IA_PD, STATE_IA_PD_INIT, STATE_CUSTOM_OPTS, STATE_SNTP_IP, STATE_NTP_IP, STATE_NTP_FQDN, STATE_SIP_IP, STATE_SIP_FQDN, STATE_RA_ROUTE, STATE_RA_PREFIX, STATE_RA_DNS, STATE_RA_SEARCH, STATE_AFTR_NAME, STATE_OPTS, STATE_CER, STATE_S46_MAPT, STATE_S46_MAPE, STATE_S46_LW, STATE_PASSTHRU, _STATE_MAX }; struct icmp6_opt { uint8_t type; uint8_t len; uint8_t data[6]; }; enum dhcpv6_mode { DHCPV6_UNKNOWN = -1, DHCPV6_STATELESS, DHCPV6_STATEFUL }; enum ra_config { RA_RDNSS_DEFAULT_LIFETIME = 1, }; enum odhcp6c_ia_mode { IA_MODE_NONE, IA_MODE_TRY, IA_MODE_FORCE, }; struct odhcp6c_entry { struct in6_addr router; uint8_t auxlen; uint8_t length; struct in6_addr target; int16_t priority; uint32_t valid; uint32_t preferred; uint32_t t1; uint32_t t2; uint32_t iaid; uint8_t auxtarget[]; }; // Include padding after auxtarget to align the next entry #define odhcp6c_entry_size(entry) \ (sizeof(struct odhcp6c_entry) + (((entry)->auxlen + 3) & ~3)) #define odhcp6c_next_entry(entry) \ ((struct odhcp6c_entry *)((uint8_t *)(entry) + odhcp6c_entry_size(entry))) struct odhcp6c_request_prefix { uint32_t iaid; uint16_t length; }; enum odhcp6c_opt_flags { OPT_U8 = 0, OPT_IP6, OPT_STR, OPT_DNS_STR, OPT_USER_CLASS, OPT_MASK_SIZE = 0x0F, OPT_ARRAY = 0x10, OPT_INTERNAL = 0x20, OPT_NO_PASSTHRU = 0x40, OPT_ORO = 0x80, OPT_ORO_STATEFUL = 0x100, OPT_ORO_STATELESS = 0x200, OPT_ORO_SOLICIT = 0x400 }; struct odhcp6c_opt { uint16_t code; uint16_t flags; const char *str; }; int init_dhcpv6(const char *ifname, unsigned int client_options, int sol_timeout); int dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd); int dhcpv6_request(enum dhcpv6_msg type); int dhcpv6_poll_reconfigure(void); int dhcpv6_promote_server_cand(void); int init_rtnetlink(void); int set_rtnetlink_addr(int ifindex, const struct in6_addr *addr, uint32_t pref, uint32_t valid); int ra_get_hoplimit(void); int ra_get_mtu(void); int ra_get_reachable(void); int ra_get_retransmit(void); 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, int delay, bool resume); bool odhcp6c_signal_process(void); uint64_t odhcp6c_get_milli_time(void); int odhcp6c_random(void *buf, size_t len); bool odhcp6c_is_bound(void); bool odhcp6c_addr_in_scope(const struct in6_addr *addr); // State manipulation void odhcp6c_clear_state(enum odhcp6c_state state); int odhcp6c_add_state(enum odhcp6c_state state, const void *data, size_t len); void odhcp6c_append_state(enum odhcp6c_state state, const void *data, size_t len); int odhcp6c_insert_state(enum odhcp6c_state state, size_t offset, const void *data, size_t len); size_t odhcp6c_remove_state(enum odhcp6c_state state, size_t offset, size_t len); void* odhcp6c_move_state(enum odhcp6c_state state, size_t *len); void* odhcp6c_get_state(enum odhcp6c_state state, size_t *len); // Entry manipulation bool odhcp6c_update_entry(enum odhcp6c_state state, struct odhcp6c_entry *new, uint32_t safe, unsigned int holdoff_interval); void odhcp6c_expire(bool expire_ia_pd); uint32_t odhcp6c_elapsed(void); struct odhcp6c_opt *odhcp6c_find_opt(const uint16_t code);