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/*
* Copyright (c) 2015 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.
*/
/*
* ip/ip4.h: ip4 main include file
*
* Copyright (c) 2008 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_ip_ip4_h
#define included_ip_ip4_h
#include <vnet/ip/ip4_mtrie.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/ip_feature_registration.h>
typedef struct ip4_fib_t {
/* Hash table for each prefix length mapping. */
uword * fib_entry_by_dst_address[33];
/* Mtrie for fast lookups. Hash is used to maintain overlapping prefixes. */
ip4_fib_mtrie_t mtrie;
/* Table ID (hash key) for this FIB. */
u32 table_id;
/* Index into FIB vector. */
u32 index;
/* flow hash configuration */
flow_hash_config_t flow_hash_config;
/* N-tuple classifier indices */
u32 fwd_classify_table_index;
u32 rev_classify_table_index;
} ip4_fib_t;
struct ip4_main_t;
typedef void (ip4_add_del_interface_address_function_t)
(struct ip4_main_t * im,
uword opaque,
u32 sw_if_index,
ip4_address_t * address,
u32 address_length,
u32 if_address_index,
u32 is_del);
typedef struct {
ip4_add_del_interface_address_function_t * function;
uword function_opaque;
} ip4_add_del_interface_address_callback_t;
/**
* @brief IPv4 main type.
*
* State of IPv4 VPP processing including:
* - FIBs
* - Feature indices used in feature topological sort
* - Feature node run time references
*/
typedef struct ip4_main_t {
ip_lookup_main_t lookup_main;
/** Vector of FIBs. */
struct fib_table_t_ * fibs;
u32 fib_masks[33];
/** Table index indexed by software interface. */
u32 * fib_index_by_sw_if_index;
/* IP4 enabled count by software interface */
u8 * ip_enabled_by_sw_if_index;
/** Hash table mapping table id to fib index.
ID space is not necessarily dense; index space is dense. */
uword * fib_index_by_table_id;
/** Functions to call when interface address changes. */
ip4_add_del_interface_address_callback_t * add_del_interface_address_callbacks;
/** Template used to generate IP4 ARP packets. */
vlib_packet_template_t ip4_arp_request_packet_template;
/** Feature path configuration lists */
vnet_ip_feature_registration_t * next_feature[VNET_N_IP_FEAT];
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_check_access;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_source_reachable_via_rx;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_source_reachable_via_any;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_policer_classify;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_flow_classify;
/** Built-in unicast feature path indix, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_ipsec;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_vpath;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_lookup;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_source_and_port_range_check;
/** Built-in unicast feature path indice, see @ref ip_feature_init_cast() */
u32 ip4_unicast_rx_feature_drop;
/** Built-in multicast feature path index */
u32 ip4_multicast_rx_feature_vpath;
/** Built-in multicast feature path index */
u32 ip4_multicast_rx_feature_lookup;
/** Built-in multicast feature path indices */
u32 ip4_multicast_rx_feature_drop;
/** Built-in unicast feature path index, see @ref ip_feature_init_cast() */
u32 ip4_unicast_tx_feature_source_and_port_range_check;
/** Built-in tx feature path index */
u32 ip4_tx_feature_interface_output;
/** Save results for show command */
char ** feature_nodes[VNET_N_IP_FEAT];
/** Seed for Jenkins hash used to compute ip4 flow hash. */
u32 flow_hash_seed;
/** @brief Template information for VPP generated packets */
struct {
/** TTL to use for host generated packets. */
u8 ttl;
/** TOS byte to use for host generated packets. */
u8 tos;
u8 pad[2];
} host_config;
} ip4_main_t;
/** Global ip4 main structure. */
extern ip4_main_t ip4_main;
#define VNET_IP4_UNICAST_FEATURE_INIT(x,...) \
__VA_ARGS__ vnet_ip_feature_registration_t uc_##x; \
static void __vnet_add_feature_registration_uc_##x (void) \
__attribute__((__constructor__)) ; \
static void __vnet_add_feature_registration_uc_##x (void) \
{ \
ip4_main_t * im = &ip4_main; \
uc_##x.next = im->next_feature[VNET_IP_RX_UNICAST_FEAT]; \
im->next_feature[VNET_IP_RX_UNICAST_FEAT] = &uc_##x; \
} \
__VA_ARGS__ vnet_ip_feature_registration_t uc_##x
#define VNET_IP4_MULTICAST_FEATURE_INIT(x,...) \
__VA_ARGS__ vnet_ip_feature_registration_t mc_##x; \
static void __vnet_add_feature_registration_mc_##x (void) \
__attribute__((__constructor__)) ; \
static void __vnet_add_feature_registration_mc_##x (void) \
{ \
ip4_main_t * im = &ip4_main; \
mc_##x.next = im->next_feature[VNET_IP_RX_MULTICAST_FEAT]; \
im->next_feature[VNET_IP_RX_MULTICAST_FEAT] = &mc_##x; \
} \
__VA_ARGS__ vnet_ip_feature_registration_t mc_##x
#define VNET_IP4_TX_FEATURE_INIT(x,...) \
__VA_ARGS__ vnet_ip_feature_registration_t tx_##x; \
static void __vnet_add_feature_registration_tx_##x (void) \
__attribute__((__constructor__)) ; \
static void __vnet_add_feature_registration_tx_##x (void) \
{ \
ip4_main_t * im = &ip4_main; \
tx_##x.next = im->next_feature[VNET_IP_TX_FEAT]; \
im->next_feature[VNET_IP_TX_FEAT] = &tx_##x; \
} \
__VA_ARGS__ vnet_ip_feature_registration_t tx_##x
/** Global ip4 input node. Errors get attached to ip4 input node. */
extern vlib_node_registration_t ip4_input_node;
extern vlib_node_registration_t ip4_lookup_node;
extern vlib_node_registration_t ip4_rewrite_node;
extern vlib_node_registration_t ip4_rewrite_local_node;
extern vlib_node_registration_t ip4_arp_node;
extern vlib_node_registration_t ip4_glean_node;
extern vlib_node_registration_t ip4_midchain_node;
always_inline uword
ip4_destination_matches_route (const ip4_main_t * im,
const ip4_address_t * key,
const ip4_address_t * dest,
uword dest_length)
{ return 0 == ((key->data_u32 ^ dest->data_u32) & im->fib_masks[dest_length]); }
always_inline uword
ip4_destination_matches_interface (ip4_main_t * im,
ip4_address_t * key,
ip_interface_address_t * ia)
{
ip4_address_t * a = ip_interface_address_get_address (&im->lookup_main, ia);
return ip4_destination_matches_route (im, key, a, ia->address_length);
}
/* As above but allows for unaligned destinations (e.g. works right from IP header of packet). */
always_inline uword
ip4_unaligned_destination_matches_route (ip4_main_t * im,
ip4_address_t * key,
ip4_address_t * dest,
uword dest_length)
{ return 0 == ((clib_mem_unaligned (&key->data_u32, u32) ^ dest->data_u32) & im->fib_masks[dest_length]); }
always_inline int
ip4_src_address_for_packet (ip_lookup_main_t * lm,
u32 sw_if_index,
ip4_address_t * src)
{
u32 if_add_index =
lm->if_address_pool_index_by_sw_if_index[sw_if_index];
if (PREDICT_TRUE(if_add_index != ~0)) {
ip_interface_address_t *if_add =
pool_elt_at_index(lm->if_address_pool, if_add_index);
ip4_address_t *if_ip =
ip_interface_address_get_address(lm, if_add);
*src = *if_ip;
return 0;
}
else
{
ASSERT(0);
src->as_u32 = 0;
}
return (!0);
}
/* Find interface address which matches destination. */
always_inline ip4_address_t *
ip4_interface_address_matching_destination (ip4_main_t * im, ip4_address_t * dst, u32 sw_if_index,
ip_interface_address_t ** result_ia)
{
ip_lookup_main_t * lm = &im->lookup_main;
ip_interface_address_t * ia;
ip4_address_t * result = 0;
foreach_ip_interface_address (lm, ia, sw_if_index,
1 /* honor unnumbered */,
({
ip4_address_t * a = ip_interface_address_get_address (lm, ia);
if (ip4_destination_matches_route (im, dst, a, ia->address_length))
{
result = a;
break;
}
}));
if (result_ia)
*result_ia = result ? ia : 0;
return result;
}
ip4_address_t *
ip4_interface_first_address (ip4_main_t * im, u32 sw_if_index,
ip_interface_address_t ** result_ia);
clib_error_t *
ip4_add_del_interface_address (vlib_main_t * vm, u32 sw_if_index,
ip4_address_t * address, u32 address_length,
u32 is_del);
void
ip4_sw_interface_enable_disable (u32 sw_if_index,
u32 is_enable);
int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
/* Send an ARP request to see if given destination is reachable on given interface. */
clib_error_t *
ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst, u32 sw_if_index);
clib_error_t *
ip4_set_arp_limit (u32 arp_limit);
uword
ip4_udp_register_listener (vlib_main_t * vm,
u16 dst_port,
u32 next_node_index);
void
ip4_icmp_register_type (vlib_main_t * vm, icmp4_type_t type,
u32 node_index);
u16 ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0, ip4_header_t * ip0);
void ip4_register_protocol (u32 protocol, u32 node_index);
serialize_function_t serialize_vnet_ip4_main, unserialize_vnet_ip4_main;
int vnet_set_ip4_flow_hash (u32 table_id, flow_hash_config_t flow_hash_config);
void ip4_mtrie_init (ip4_fib_mtrie_t * m);
int vnet_set_ip4_classify_intfc (vlib_main_t * vm, u32 sw_if_index,
u32 table_index);
/* Compute flow hash. We'll use it to select which adjacency to use for this
flow. And other things. */
always_inline u32
ip4_compute_flow_hash (const ip4_header_t * ip,
flow_hash_config_t flow_hash_config)
{
tcp_header_t * tcp = (void *) (ip + 1);
u32 a, b, c, t1, t2;
uword is_tcp_udp = (ip->protocol == IP_PROTOCOL_TCP
|| ip->protocol == IP_PROTOCOL_UDP);
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_ADDR)
? ip->src_address.data_u32 : 0;
t2 = (flow_hash_config & IP_FLOW_HASH_DST_ADDR)
? ip->dst_address.data_u32 : 0;
a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1;
b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2;
b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0;
t1 = is_tcp_udp ? tcp->ports.src : 0;
t2 = is_tcp_udp ? tcp->ports.dst : 0;
t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0;
t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0;
c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ?
(t1<<16) | t2 : (t2<<16) | t1;
hash_v3_mix32 (a, b, c);
hash_v3_finalize32 (a, b, c);
return c;
}
#endif /* included_ip_ip4_h */
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