| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (C) Microsoft Corporation |
| * Author: Sean Edmond <seanedmond@microsoft.com> |
| * |
| */ |
| |
| #ifndef __DHCP6_H__ |
| #define __DHCP6_H__ |
| |
| /* Message types */ |
| #define DHCP6_MSG_SOLICIT 1 |
| #define DHCP6_MSG_ADVERTISE 2 |
| #define DHCP6_MSG_REQUEST 3 |
| #define DHCP6_MSG_REPLY 7 |
| |
| /* Option Codes */ |
| #define DHCP6_OPTION_CLIENTID 1 |
| #define DHCP6_OPTION_SERVERID 2 |
| #define DHCP6_OPTION_IA_NA 3 |
| #define DHCP6_OPTION_IA_TA 4 |
| #define DHCP6_OPTION_IAADDR 5 |
| #define DHCP6_OPTION_ORO 6 |
| #define DHCP6_OPTION_PREFERENCE 7 |
| #define DHCP6_OPTION_ELAPSED_TIME 8 |
| #define DHCP6_OPTION_STATUS_CODE 13 |
| #define DHCP6_OPTION_OPT_BOOTFILE_URL 59 |
| #define DHCP6_OPTION_OPT_BOOTFILE_PARAM 60 |
| #define DHCP6_OPTION_SOL_MAX_RT 82 |
| #define DHCP6_OPTION_CLIENT_ARCH_TYPE 61 |
| #define DHCP6_OPTION_VENDOR_CLASS 16 |
| #define DHCP6_OPTION_NII 62 |
| |
| /* DUID */ |
| #define DUID_TYPE_LL 3 |
| #define DUID_HW_TYPE_ENET 1 |
| #define DUID_LL_SIZE (sizeof(struct dhcp6_option_duid_ll) + ETH_ALEN) |
| #define DUID_MAX_SIZE DUID_LL_SIZE /* only supports DUID-LL currently */ |
| |
| /* vendor-class-data to send in vendor clas option */ |
| #define DHCP6_VCI_STRING "U-Boot" |
| |
| #define DHCP6_MULTICAST_ADDR "ff02::1:2" /* DHCP multicast address */ |
| |
| /* DHCP6 States supported */ |
| enum dhcp6_state { |
| DHCP6_INIT, |
| DHCP6_SOLICIT, |
| DHCP6_REQUEST, |
| DHCP6_DONE, |
| DHCP6_FAIL, |
| }; |
| |
| /* DHCP6 Status codes */ |
| enum dhcp6_status { |
| DHCP6_SUCCESS = 0, |
| DHCP6_UNSPEC_FAIL = 1, |
| DHCP6_NO_ADDRS_AVAIL = 2, |
| DHCP6_NO_BINDING = 3, |
| DHCP6_NOT_ON_LINK = 4, |
| DHCP6_USE_MULTICAST = 5, |
| DHCP6_NO_PREFIX_AVAIL = 6, |
| }; |
| |
| /* DHCP6 message header format */ |
| struct dhcp6_hdr { |
| unsigned int msg_type : 8; /* message type */ |
| unsigned int trans_id : 24; /* transaction ID */ |
| } __packed; |
| |
| /* DHCP6 option header format */ |
| struct dhcp6_option_hdr { |
| __be16 option_id; /* option id */ |
| __be16 option_len; /* Option length */ |
| u8 option_data[0]; /* Option data */ |
| } __packed; |
| |
| /* DHCP6_OPTION_CLIENTID option (DUID-LL) */ |
| struct dhcp6_option_duid_ll { |
| __be16 duid_type; |
| __be16 hw_type; |
| u8 ll_addr[0]; |
| } __packed; |
| |
| /* DHCP6_OPTION_ELAPSED_TIME option */ |
| struct dhcp6_option_elapsed_time { |
| __be16 elapsed_time; |
| } __packed; |
| |
| /* DHCP6_OPTION_IA_TA option */ |
| struct dhcp6_option_ia_ta { |
| __be32 iaid; |
| u8 ia_ta_options[0]; |
| } __packed; |
| |
| /* DHCP6_OPTION_IA_NA option */ |
| struct dhcp6_option_ia_na { |
| __be32 iaid; |
| __be32 t1; |
| __be32 t2; |
| u8 ia_na_options[0]; |
| } __packed; |
| |
| /* OPTION_ORO option */ |
| struct dhcp6_option_oro { |
| __be16 req_option_code[0]; |
| } __packed; |
| |
| /* DHCP6_OPTION_CLIENT_ARCH_TYPE option */ |
| struct dhcp6_option_client_arch { |
| __be16 arch_type[0]; |
| } __packed; |
| |
| /* vendor-class-data inside OPTION_VENDOR_CLASS option */ |
| struct vendor_class_data { |
| __be16 vendor_class_len; |
| u8 opaque_data[0]; |
| } __packed; |
| |
| /* DHCP6_OPTION_VENDOR_CLASS option */ |
| struct dhcp6_option_vendor_class { |
| __be32 enterprise_number; |
| struct vendor_class_data vendor_class_data[0]; |
| } __packed; |
| |
| /** |
| * struct dhcp6_rx_pkt_status - Structure that holds status |
| * from a received message |
| * @client_id_match: Client ID was found and matches DUID sent |
| * @server_id_found: Server ID was found in the message |
| * @server_uid_ptr: Pointer to received server ID |
| * @server_uid_size: Size of received server ID |
| * @ia_addr_found: IA addr option was found in received message |
| * @ia_addr_ipv6: The IPv6 address received in IA |
| * @ia_status_code: Status code received in the IA |
| * @status_code: Top-level status code received |
| * @preference: Preference code received |
| */ |
| struct dhcp6_rx_pkt_status { |
| bool client_id_match; |
| bool server_id_found; |
| uchar *server_uid_ptr; |
| u16 server_uid_size; |
| bool ia_addr_found; |
| struct in6_addr ia_addr_ipv6; |
| enum dhcp6_status ia_status_code; |
| enum dhcp6_status status_code; |
| u8 preference; |
| }; |
| |
| /** |
| * struct dhcp6_server_uid - Structure that holds the server UID |
| * received from an ADVERTISE and saved |
| * given the server selection criteria. |
| * @uid_ptr: Dynamically allocated and copied server UID |
| * @uid_size: Size of the server UID in uid_ptr (in bytes) |
| * @preference: Preference code associated with this server UID |
| */ |
| struct dhcp6_server_uid { |
| uchar *uid_ptr; |
| u16 uid_size; |
| u8 preference; |
| }; |
| |
| /** |
| * struct dhcp6_sm_params - Structure that holds DHCP6 |
| * state machine parameters |
| * @curr_state: current DHCP6 state |
| * @next_state: next DHCP6 state |
| * @dhcp6_start_ms: timestamp DHCP6 start |
| * @dhcp6_retry_start_ms: timestamp of current TX message start |
| * @dhcp6_retry_ms: timestamp of last retransmission |
| * @retry_cnt: retry count |
| * @trans_id: transaction ID |
| * @ia_id: transmitted IA ID |
| * @irt_ms: Initial retransmission time (in ms) |
| * @mrt_ms: Maximum retransmission time (in ms) |
| * @mrc: Maximum retransmission count |
| * @mrd_ms: Maximum retransmission duration (in ms) |
| * @rt_ms: retransmission timeout (is ms) |
| * @rt_prev_ms: previous retransmission timeout |
| * @rx_status: Status from received message |
| * @server_uid: Saved Server UID for selected server |
| * @duid: pointer to transmitted Client DUID |
| */ |
| struct dhcp6_sm_params { |
| enum dhcp6_state curr_state; |
| enum dhcp6_state next_state; |
| ulong dhcp6_start_ms; |
| ulong dhcp6_retry_start_ms; |
| ulong dhcp6_retry_ms; |
| u32 retry_cnt; |
| u32 trans_id; |
| u32 ia_id; |
| int irt_ms; |
| int mrt_ms; |
| int mrc; |
| int mrd_ms; |
| int rt_ms; |
| int rt_prev_ms; |
| struct dhcp6_rx_pkt_status rx_status; |
| struct dhcp6_server_uid server_uid; |
| char duid[DUID_MAX_SIZE]; |
| }; |
| |
| /* Starts a DHCPv6 4-message exchange as a DHCPv6 client. On successful exchange, |
| * the DHCPv6 state machine will transition from internal states: |
| * DHCP6_INIT->DHCP6_SOLICIT->DHCP6_REQUEST->DHCP6_DONE |
| * |
| * Transmitted SOLICIT and REQUEST packets will set/request the minimum required |
| * DHCPv6 options to PXE boot. |
| * |
| * After a successful exchange, the DHCPv6 assigned address will be set in net_ip6 |
| * |
| * Additionally, the following will be set after receiving these options: |
| * DHCP6_OPTION_OPT_BOOTFILE_URL (option 59) -> net_server_ip6, net_boot_file_name |
| * DHCP6_OPTION_OPT_BOOTFILE_PARAM (option 60) - > pxelinux_configfile |
| * |
| * Illustration of a 4-message exchange with 2 servers (copied from |
| * https://www.rfc-editor.org/rfc/rfc8415): |
| * |
| * Server Server |
| * (not selected) Client (selected) |
| * |
| * v v v |
| * | | | |
| * | Begins initialization | |
| * | | | |
| * start of | _____________/|\_____________ | |
| * 4-message |/ Solicit | Solicit \| |
| * exchange | | | |
| * Determines | Determines |
| * configuration | configuration |
| * | | | |
| * |\ | ____________/| |
| * | \________ | /Advertise | |
| * | Advertise\ |/ | |
| * | \ | | |
| * | Collects Advertises | |
| * | \ | | |
| * | Selects configuration | |
| * | | | |
| * | _____________/|\_____________ | |
| * |/ Request | Request \| |
| * | | | |
| * | | Commits configuration |
| * | | | |
| * end of | | _____________/| |
| * 4-message | |/ Reply | |
| * exchange | | | |
| * | Initialization complete | |
| * | | | |
| */ |
| void dhcp6_start(void); |
| |
| #endif /* __DHCP6_H__ */ |