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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 <vnet/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 <vnet/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 <vnet/dhcp/dhcp6_proxy_error.def>
#undef dhcpv6_proxy_error
DHCPV6_PROXY_N_ERROR,
} dhcpv6_proxy_error_t;
/**
* @brief The Virtual Sub-net Selection information for a given RX FIB
*/
typedef struct dhcp_vss_t_ {
/**
* @brief ?? RFC doesn't say
*/
u32 oui;
/**
* @brief VPN-ID
*/
u32 fib_id;
} dhcp_vss_t;
/**
* @brief A DHCP proxy server represenation
*/
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 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 server
* is reachable.
*/
u32 server_fib_index;
/**
* @brief The FIB index (not the external Table-ID) in which the client
* is resides.
*/
u32 rx_fib_index;
} dhcp_server_t;
#define DHCP_N_PROTOS (FIB_PROTOCOL_IP6 + 1)
/**
* @brief Collection of global DHCP proxy data
*/
typedef struct {
/* Pool of DHCP servers */
dhcp_server_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];
} dhcp_proxy_main_t;
extern dhcp_proxy_main_t dhcp_proxy_main;
/**
* @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,
const ip46_address_t *server,
const ip46_address_t *src,
u32 server_fib_id,
u32 rx_fib_id,
u32 vss_fib_id,
u32 vss_oui);
/**
* @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 vrf_id,
u32 oui,
u32 fib_id,
int 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 0 is deleted, otherwise an error code
*/
int dhcp_proxy_server_del(fib_protocol_t proto,
u32 rx_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_server_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 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_server_t *
dhcp_get_server (dhcp_proxy_main_t *dm,
u32 rx_fib_index,
fib_protocol_t proto)
{
dhcp_server_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 */
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