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/*
// Copyright (c) 2017 Intel Corporation
//
// 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.
*/
/**
* @file
* Gateway packet forwarding Implementation.
*
* Implementation of gateway packet forwarding, next hop IP and
* associated processing.
*
*/
#include <rte_mbuf.h>
#include <rte_malloc.h>
#include <rte_ethdev.h>
#include <rte_memcpy.h>
#include "gateway.h"
#include "pipeline_common_fe.h"
#define IP_VERSION_4 4
#define IP_VERSION_6 6
#define MAX_PORTS 32
/* Global stats counters used in ARP */
extern uint32_t lib_nd_nh_found;
extern uint32_t lib_arp_nh_found;
struct route_data *p_route_data[MAX_PORTS];
struct nd_route_data *p_nd_route_data[MAX_PORTS];
/**
* VNF is configured with routing info or not
* vnf_gateway = 0: No Routes Added , 1: Routes defined
* Flag is part of the ARPICMP config parameter
*/
/* Initialized for IP Pkt forwarding */
uint32_t vnf_gateway = 0;
/* Initialized number of out ports to route */
uint32_t num_out_ports = 0;
/**
* Initialize the gateway for routing tables
*
* @param void
* None
* @return uint32_t
* 1 to MAX_PORTS
*/
void gw_init(uint32_t num_ports)
{
void *p;
uint32_t size;
uint32_t i;
num_out_ports = num_ports;
for(i = 0; i < num_ports; i++) {
/* IPv4 route table */
size = RTE_CACHE_LINE_ROUNDUP(sizeof(struct route_data));
p = rte_zmalloc(NULL, size, RTE_CACHE_LINE_SIZE);
p_route_data[i] = (struct route_data *)p;
/* IPv6 route touble */
size = RTE_CACHE_LINE_ROUNDUP(sizeof(struct nd_route_data));
p = rte_zmalloc(NULL, size, RTE_CACHE_LINE_SIZE);
p_nd_route_data[i] = (struct nd_route_data *)p;
}
}
/*
* Get the the number of ports to route
* @param void
* None
* @return uint32_t
* Number of ports enabled in the VNF
*/
uint32_t gw_get_num_ports(void)
{
return num_out_ports;
}
/**
* Check if the gateway is enabled
*
* @param void
* None
* @return uint32_t
* 0: No routes, 1: Route entries available
*/
uint32_t is_gateway(void)
{
return vnf_gateway;
}
/**
* Get the next hop ip address and port number for IPv4
* @param dst_ip_addr
* Destination IPv4 address
* @param dst_port
* A pointer to destination port
* @param nhip
* A pointer to next hop ip address
*/
void gw_get_nh_port_ipv4(uint32_t dst_ip_addr,
uint32_t *dst_port, uint32_t *nhip)
{
int i;
uint32_t j;
*nhip = 0;
*dst_port = 0xff;
for(j = 0; j < gw_get_num_ports(); j++){
for (i = 0; i < p_route_data[j]->route_ent_cnt; i++) {
if ((p_route_data[j]->route_table[i].nh_mask) ==
(dst_ip_addr &
p_route_data[j]->route_table[i].mask)) {
*dst_port = p_route_data[j]->route_table[i].port;
*nhip = p_route_data[j]->route_table[i].nh;
lib_arp_nh_found++;
return;
}
}
}
}
/**
* Get the next hop ip address and port number for IPv6
* @param dst_ipv6_addr
* Destination IPv6 address
* @param dst_port
* A pointer to destination port
* @param nhipv6
* A pointer to next hop ip address
*/
void gw_get_nh_port_ipv6(uint8_t *dst_ipv6_addr,
uint32_t *dst_port, uint8_t *nhipv6)
{
if (!dst_ipv6_addr)
return;
uint32_t j;
for(j = 0; j < gw_get_num_ports(); j++){
if(p_nd_route_data[j]->nd_route_ent_cnt){
memset(nhipv6, 0, IPV6_ADD_SIZE);
int i=0;
uint8_t netmask_ipv6[IPV6_ADD_SIZE], netip_nd[IPV6_ADD_SIZE];
uint8_t netip_in[IPV6_ADD_SIZE];
uint8_t k = 0, depthflags = 0, depthflags1 = 0;
memset(netmask_ipv6, 0, sizeof(netmask_ipv6));
memset(netip_nd, 0, sizeof(netip_nd));
memset(netip_in, 0, sizeof(netip_in));
for (i = 0; i < p_nd_route_data[j]->nd_route_ent_cnt; i++) {
convert_prefixlen_to_netmask_ipv6(
p_nd_route_data[j]->nd_route_table[i].depth, netmask_ipv6);
for (k = 0; k < IPV6_ADD_SIZE; k++) {
if (p_nd_route_data[j]->nd_route_table[i].nhipv6[k] &
netmask_ipv6[k]) {
depthflags++;
netip_nd[k] = p_nd_route_data[j]->nd_route_table[i].nhipv6[k];
}
if (dst_ipv6_addr[k] & netmask_ipv6[k]) {
depthflags1++;
netip_in[k] = dst_ipv6_addr[k];
}
}
if ((depthflags == depthflags1) &&
(memcmp(netip_nd, netip_in, sizeof(netip_nd)) == 0)) {
*dst_port = p_nd_route_data[j]->nd_route_table[i].port;
lib_nd_nh_found++;
rte_mov16(nhipv6, (uint8_t *)
&(p_nd_route_data[j]->nd_route_table[i].nhipv6[0]));
return;
}
}
}
}
}
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