e977853e70
RFCs for DHCPv6 are written rather badly... Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
201 lines
6.6 KiB
C
201 lines
6.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2011 Denys Vlasenko.
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#ifndef UDHCP_D6_COMMON_H
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#define UDHCP_D6_COMMON_H 1
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#include <netinet/ip6.h>
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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/*** DHCPv6 packet ***/
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/* DHCPv6 protocol. See RFC 3315 */
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#define D6_MSG_SOLICIT 1
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#define D6_MSG_ADVERTISE 2
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#define D6_MSG_REQUEST 3
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#define D6_MSG_CONFIRM 4
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#define D6_MSG_RENEW 5
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#define D6_MSG_REBIND 6
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#define D6_MSG_REPLY 7
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#define D6_MSG_RELEASE 8
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#define D6_MSG_DECLINE 9
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#define D6_MSG_RECONFIGURE 10
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#define D6_MSG_INFORMATION_REQUEST 11
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#define D6_MSG_RELAY_FORW 12
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#define D6_MSG_RELAY_REPL 13
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struct d6_packet {
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union {
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uint8_t d6_msg_type;
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uint32_t d6_xid32;
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} d6_u;
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uint8_t d6_options[576 - sizeof(struct ip6_hdr) - sizeof(struct udphdr) - 4
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+ CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
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} PACKED;
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#define d6_msg_type d6_u.d6_msg_type
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#define d6_xid32 d6_u.d6_xid32
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struct ip6_udp_d6_packet {
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struct ip6_hdr ip6;
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struct udphdr udp;
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struct d6_packet data;
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} PACKED;
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struct udp_d6_packet {
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struct udphdr udp;
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struct d6_packet data;
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} PACKED;
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/*** Options ***/
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struct d6_option {
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uint8_t code_hi;
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uint8_t code;
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uint8_t len_hi;
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uint8_t len;
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uint8_t data[1];
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} PACKED;
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#define D6_OPT_CLIENTID 1
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#define D6_OPT_SERVERID 2
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/* "Identity Association for Non-temporary Addresses",
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* also known as a "network interface" in plain English */
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#define D6_OPT_IA_NA 3
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/* "Identity Association for the Temporary Addresses".
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* Presumably this is a "network interface with only link-local addresses".
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* Why would DHCPv6 server assign such addresses, I have no idea. */
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//#define D6_OPT_IA_TA 4
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/* "IA Address", an IPv6 address */
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#define D6_OPT_IAADDR 5
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/* Option "Option Request Option". From the owners of a doggy dog named Dog? */
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#define D6_OPT_ORO 6
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//#define D6_OPT_PREFERENCE 7
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#define D6_OPT_ELAPSED_TIME 8
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//#define D6_OPT_RELAY_MSG 9
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//#define D6_OPT_AUTH 11
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/* "The server sends this option to a client to indicate to the client
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* that it is allowed to unicast messages to the server."
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* Contains IPv6 address to send packets to. */
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//#define D6_OPT_UNICAST 12
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/* "A Status Code option may appear in the options field of a DHCP
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* message and/or in the options field of another option." */
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#define D6_OPT_STATUS_CODE 13
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/* "A client MAY include this option in a Solicit message if the client
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* is prepared to perform the Solicit-Reply message exchange..." */
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//#define D6_OPT_RAPID_COMMIT 14 /* zero-length option */
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//#define D6_OPT_USER_CLASS 15
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//#define D6_OPT_VENDOR_CLASS 16
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//#define D6_OPT_VENDOR_OPTS 17
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//#define D6_OPT_INTERFACE_ID 18
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//#define D6_OPT_RECONF_MSG 19
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//#define D6_OPT_RECONF_ACCEPT 20
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#define D6_OPT_DNS_SERVERS 23
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#define D6_OPT_DOMAIN_LIST 24
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/* RFC 3633 "Identity Association for Prefix Delegation".
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* This option says that client wants to get an IPv6 prefix */
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#define D6_OPT_IA_PD 25
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/* Response from the server comes in this one */
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#define D6_OPT_IAPREFIX 26
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/* RFC 4704 "The DHCPv6 Client FQDN Option"
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* uint16 option-code OPTION_CLIENT_FQDN (39)
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* uint16 option-len 1 + length of domain name
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* uint8 flags
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* char[] domain-name partial or fully qualified domain name
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*
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* Flags format is |MBZ|N|O|S|
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* The "S" bit indicates whether the server SHOULD or SHOULD NOT perform
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* the AAAA RR (FQDN-to-address) DNS updates. A client sets the bit to
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* 0 to indicate that the server SHOULD NOT perform the updates and 1 to
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* indicate that the server SHOULD perform the updates. The state of
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* the bit in the reply from the server indicates the action to be taken
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* by the server; if it is 1, the server has taken responsibility for
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* AAAA RR updates for the FQDN.
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* The "O" bit indicates whether the server has overridden the client's
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* preference for the "S" bit. A client MUST set this bit to 0. A
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* server MUST set this bit to 1 if the "S" bit in its reply to the
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* client does not match the "S" bit received from the client.
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* The "N" bit indicates whether the server SHOULD NOT perform any DNS
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* updates. A client sets this bit to 0 to request that the server
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* SHOULD perform updates (the PTR RR and possibly the AAAA RR based on
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* the "S" bit) or to 1 to request that the server SHOULD NOT perform
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* any DNS updates. A server sets the "N" bit to indicate whether the
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* server SHALL (0) or SHALL NOT (1) perform DNS updates. If the "N"
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* bit is 1, the "S" bit MUST be 0.
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*
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* If a client knows only part of its name, it MAY send a name that is not
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* fully qualified, indicating that it knows part of the name but does not
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* necessarily know the zone in which the name is to be embedded.
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* To send a fully qualified domain name, the Domain Name field is set
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* to the DNS-encoded domain name including the terminating zero-length
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* label. To send a partial name, the Domain Name field is set to the
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* DNS-encoded domain name without the terminating zero-length label.
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* A client MAY also leave the Domain Name field empty if it desires the
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* server to provide a name.
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*/
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#define D6_OPT_CLIENT_FQDN 39
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#define D6_OPT_TZ_POSIX 41
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#define D6_OPT_TZ_NAME 42
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#define D6_OPT_BOOT_URL 59
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#define D6_OPT_BOOT_PARAM 60
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/*** Other shared functions ***/
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struct client6_data_t {
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struct d6_option *server_id;
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struct d6_option *ia_na;
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struct d6_option *ia_pd;
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char **env_ptr;
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unsigned env_idx;
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/* link-local IPv6 address */
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struct in6_addr ll_ip6;
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} FIX_ALIASING;
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#define client6_data (*(struct client6_data_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE - sizeof(struct client6_data_t)]))
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int FAST_FUNC d6_read_interface(
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const char *interface,
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int *ifindex,
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struct in6_addr *nip6,
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uint8_t *mac
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);
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int FAST_FUNC d6_listen_socket(int port, const char *inf);
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int FAST_FUNC d6_recv_kernel_packet(
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struct in6_addr *peer_ipv6,
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struct d6_packet *packet, int fd
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);
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int FAST_FUNC d6_send_raw_packet_from_client_data_ifindex(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port, const uint8_t *dest_arp
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);
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int FAST_FUNC d6_send_kernel_packet_from_client_data_ifindex(
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struct d6_packet *d6_pkt, unsigned d6_pkt_size,
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struct in6_addr *src_ipv6, int source_port,
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struct in6_addr *dst_ipv6, int dest_port
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);
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
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void FAST_FUNC d6_dump_packet(struct d6_packet *packet);
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#else
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# define d6_dump_packet(packet) ((void)0)
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#endif
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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