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/*
* 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/ip/format.h>
#include <vnet/udp/udp_local.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:
*/
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