/* * dhcp_proxy.h: DHCP v4 & v6 proxy common functions/types * * Copyright (c) 2013 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef included_dhcp_proxy_h #define included_dhcp_proxy_h #include <vnet/vnet.h> #include <dhcp/dhcp4_packet.h> #include <vnet/ethernet/ethernet.h> #include <vnet/ip/ip.h> #include <vnet/ip/ip4.h> #include <vnet/ip/ip4_packet.h> #include <vnet/pg/pg.h> #include <vnet/ip/format.h> #include <vnet/udp/udp.h> typedef enum { #define dhcp_proxy_error(n,s) DHCP_PROXY_ERROR_##n, #include <dhcp/dhcp4_proxy_error.def> #undef dhcp_proxy_error DHCP_PROXY_N_ERROR, } dhcp_proxy_error_t; typedef enum { #define dhcpv6_proxy_error(n,s) DHCPV6_PROXY_ERROR_##n, #include <dhcp/dhcp6_proxy_error.def> #undef dhcpv6_proxy_error DHCPV6_PROXY_N_ERROR, } dhcpv6_proxy_error_t; /* flags to indicate which DHCP ports should be or have been registered */ typedef enum { DHCP_PORT_REG_CLIENT = 0x1, DHCP_PORT_REG_SERVER = 0x2, } dhcp_port_reg_flags_t; /** * @brief The Virtual Sub-net Selection information for a given RX FIB */ typedef struct dhcp_vss_t_ { /** * @brief VSS type as defined in RFC 6607: * 0 for NVT ASCII VPN Identifier * 1 for RFC 2685 VPN-ID of 7 octects - 3 bytes OUI & 4 bytes VPN index * 255 for global default VPN */ u8 vss_type; #define VSS_TYPE_ASCII 0 #define VSS_TYPE_VPN_ID 1 #define VSS_TYPE_INVALID 123 #define VSS_TYPE_DEFAULT 255 /** * @brief Type 1 VPN-ID */ u8 vpn_id[7]; /** * @brief Type 0 ASCII VPN Identifier */ u8 *vpn_ascii_id; } dhcp_vss_t; /** * @brief A representation of a single DHCP Server within a given VRF config */ typedef struct dhcp_server_t_ { /** * @brief The address of the DHCP server to which to relay the client's * messages */ ip46_address_t dhcp_server; /** * @brief The FIB index (not the external Table-ID) in which the server * is reachable. */ u32 server_fib_index; } dhcp_server_t; /** * @brief A DHCP proxy representation fpr per-client VRF config */ typedef struct dhcp_proxy_t_ { /** * @brief The set of DHCP servers to which messages are relayed. * If multiple servers are configured then discover/solict messages * are relayed to each. A cookie is maintained for the relay, and only * one message is replayed to the client, based on the presence of the * cookie. * The expectation is there are only 1 or 2 servers, hence no fancy DB. */ dhcp_server_t *dhcp_servers; /** * @brief Hash table of pending requets key'd on the clients MAC address */ uword *dhcp_pending; /** * @brief A lock for the pending request DB. */ int lock; /** * @brief The source address to use in relayed messaes */ ip46_address_t dhcp_src_address; /** * @brief The FIB index (not the external Table-ID) in which the client * is resides. */ u32 rx_fib_index; } dhcp_proxy_t; #define DHCP_N_PROTOS (FIB_PROTOCOL_IP6 + 1) /** * @brief Collection of global DHCP proxy data */ typedef struct { /* Pool of DHCP servers */ dhcp_proxy_t *dhcp_servers[DHCP_N_PROTOS]; /* Pool of selected DHCP server. Zero is the default server */ u32 *dhcp_server_index_by_rx_fib_index[DHCP_N_PROTOS]; /* to drop pkts in server-to-client direction */ u32 error_drop_node_index; dhcp_vss_t *vss[DHCP_N_PROTOS]; /* hash lookup specific vrf_id -> option 82 vss suboption */ u32 *vss_index_by_rx_fib_index[DHCP_N_PROTOS]; /* flags to indicate which udp ports have been registered */ int udp_ports_registered; /* convenience */ vlib_main_t *vlib_main; } dhcp_proxy_main_t; extern dhcp_proxy_main_t dhcp_proxy_main; /** * @brief Register the dhcp client and/or server ports, if not already done */ void dhcp_maybe_register_udp_ports (dhcp_port_reg_flags_t ports); /** * @brief Send the details of a proxy session to the API client during a dump */ void dhcp_send_details (fib_protocol_t proto, void *opaque, u32 context, dhcp_proxy_t * proxy); /** * @brief Show (on CLI) a VSS config during a show walk */ int dhcp_vss_show_walk (dhcp_vss_t * vss, u32 rx_table_id, void *ctx); /** * @brief Configure/set a new VSS info */ int dhcp_proxy_set_vss (fib_protocol_t proto, u32 tbl_id, u8 vss_type, u8 * vpn_ascii_id, u32 oui, u32 vpn_index, u8 is_del); /** * @brief Dump the proxy configs to the API */ void dhcp_proxy_dump (fib_protocol_t proto, void *opaque, u32 context); /** * @brief Add a new DHCP proxy server configuration. * @return 1 is the config is new, * 0 otherwise (implying a modify of an existing) */ int dhcp_proxy_server_add (fib_protocol_t proto, ip46_address_t * addr, ip46_address_t * src_address, u32 rx_fib_iindex, u32 server_table_id); /** * @brief Delete a DHCP proxy config * @return 1 if the proxy is deleted, 0 otherwise */ int dhcp_proxy_server_del (fib_protocol_t proto, u32 rx_fib_index, ip46_address_t * addr, u32 server_table_id); u32 dhcp_proxy_rx_table_get_table_id (fib_protocol_t proto, u32 fib_index); /** * @brief Callback function invoked for each DHCP proxy entry * return 0 to break the walk, non-zero otherwise. */ typedef int (*dhcp_proxy_walk_fn_t) (dhcp_proxy_t * server, void *ctx); /** * @brief Walk/Visit each DHCP proxy server */ void dhcp_proxy_walk (fib_protocol_t proto, dhcp_proxy_walk_fn_t fn, void *ctx); /** * @brief Callback function invoked for each DHCP VSS entry * return 0 to break the walk, non-zero otherwise. */ typedef int (*dhcp_vss_walk_fn_t) (dhcp_vss_t * server, u32 rx_table_id, void *ctx); /** * @brief Walk/Visit each DHCP proxy VSS */ void dhcp_vss_walk (fib_protocol_t proto, dhcp_vss_walk_fn_t fn, void *ctx); /** * @brief Lock a proxy object to prevent simultaneous access of its * pending store */ void dhcp_proxy_lock (dhcp_proxy_t * server); /** * @brief Lock a proxy object to prevent simultaneous access of its * pending store */ void dhcp_proxy_unlock (dhcp_proxy_t * server); /** * @brief Get the VSS data for the FIB index */ static inline dhcp_vss_t * dhcp_get_vss_info (dhcp_proxy_main_t * dm, u32 rx_fib_index, fib_protocol_t proto) { dhcp_vss_t *v = NULL; if (vec_len (dm->vss_index_by_rx_fib_index[proto]) > rx_fib_index && dm->vss_index_by_rx_fib_index[proto][rx_fib_index] != ~0) { v = pool_elt_at_index (dm->vss[proto], dm->vss_index_by_rx_fib_index[proto] [rx_fib_index]); } return (v); } /** * @brief Get the DHCP proxy server data for the FIB index */ static inline dhcp_proxy_t * dhcp_get_proxy (dhcp_proxy_main_t * dm, u32 rx_fib_index, fib_protocol_t proto) { dhcp_proxy_t *s = NULL; if (vec_len (dm->dhcp_server_index_by_rx_fib_index[proto]) > rx_fib_index && dm->dhcp_server_index_by_rx_fib_index[proto][rx_fib_index] != ~0) { s = pool_elt_at_index (dm->dhcp_servers[proto], dm->dhcp_server_index_by_rx_fib_index[proto] [rx_fib_index]); } return (s); } int dhcp6_proxy_set_server (ip46_address_t * addr, ip46_address_t * src_addr, u32 rx_table_id, u32 server_table_id, int is_del); int dhcp4_proxy_set_server (ip46_address_t * addr, ip46_address_t * src_addr, u32 rx_table_id, u32 server_table_id, int is_del); #endif /* included_dhcp_proxy_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */