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/*
// Copyright (c) 2010-2017 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.
*/
#include <rte_mbuf.h>
#include <rte_hash.h>
#include <rte_hash_crc.h>
#include <rte_ether.h>
#include <rte_ip.h>
#include <rte_version.h>
#include <rte_byteorder.h>
#include "prox_lua_types.h"
#include "prox_lua.h"
#include "prox_malloc.h"
#include "prox_cksum.h"
#include "prefetch.h"
#include "etypes.h"
#include "log.h"
#include "quit.h"
#include "task_init.h"
#include "task_base.h"
#include "lconf.h"
#include "log.h"
#include "prox_port_cfg.h"
struct task_nat {
struct task_base base;
struct rte_hash *hash;
uint32_t *entries;
int use_src;
int offload_crc;
};
struct pkt_eth_ipv4 {
prox_rte_ether_hdr ether_hdr;
prox_rte_ipv4_hdr ipv4_hdr;
} __attribute__((packed)) __attribute__((__aligned__(2)));
static int handle_nat(struct task_nat *task, struct rte_mbuf *mbuf)
{
uint32_t *ip_addr;
struct pkt_eth_ipv4 *pkt = rte_pktmbuf_mtod(mbuf, struct pkt_eth_ipv4 *);
int ret;
/* Currently, only support eth/ipv4 packets */
if (pkt->ether_hdr.ether_type != ETYPE_IPv4)
return OUT_DISCARD;
if (task->use_src)
ip_addr = &(pkt->ipv4_hdr.src_addr);
else
ip_addr = &(pkt->ipv4_hdr.dst_addr);
ret = rte_hash_lookup(task->hash, ip_addr);
/* Drop all packets for which no translation has been
configured. */
if (ret < 0)
return OUT_DISCARD;
*ip_addr = task->entries[ret];
prox_ip_udp_cksum(mbuf, &pkt->ipv4_hdr, sizeof(prox_rte_ether_hdr), sizeof(prox_rte_ipv4_hdr), task->offload_crc);
return 0;
}
static int handle_nat_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct task_nat *task = (struct task_nat *)tbase;
uint8_t out[MAX_PKT_BURST];
uint16_t j;
prefetch_first(mbufs, n_pkts);
for (j = 0; j + PREFETCH_OFFSET < n_pkts; ++j) {
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(mbufs[j + PREFETCH_OFFSET]);
PREFETCH0(rte_pktmbuf_mtod(mbufs[j + PREFETCH_OFFSET - 1], void *));
#endif
out[j] = handle_nat(task, mbufs[j]);
}
#ifdef PROX_PREFETCH_OFFSET
PREFETCH0(rte_pktmbuf_mtod(mbufs[n_pkts - 1], void *));
for (; j < n_pkts; ++j) {
out[j] = handle_nat(task, mbufs[j]);
}
#endif
return task->base.tx_pkt(&task->base, mbufs, n_pkts, out);
}
static int lua_to_hash_nat(struct lua_State *L, enum lua_place from, const char *name,
uint8_t socket, struct rte_hash **hash, uint32_t **entries)
{
struct rte_hash *ret_hash;
uint32_t *ret_entries;
uint32_t n_entries;
uint32_t ip_from, ip_to;
int ret, pop;
if ((pop = lua_getfrom(L, from, name)) < 0)
return -1;
lua_len(L, -1);
n_entries = lua_tointeger(L, -1);
lua_pop(L, 1);
PROX_PANIC(n_entries == 0, "No entries for NAT\n");
static char hash_name[30] = "000_hash_nat_table";
const struct rte_hash_parameters hash_params = {
.name = hash_name,
.entries = n_entries * 4,
.key_len = sizeof(ip_from),
.hash_func = rte_hash_crc,
.hash_func_init_val = 0,
};
ret_hash = rte_hash_create(&hash_params);
PROX_PANIC(ret_hash == NULL, "Failed to set up hash table for NAT\n");
name++;
ret_entries = prox_zmalloc(n_entries * sizeof(ip_to), socket);
PROX_PANIC(ret_entries == NULL, "Failed to allocate memory for NAT %u entries\n", n_entries);
lua_pushnil(L);
while (lua_next(L, -2)) {
if (lua_to_ip(L, TABLE, "from", &ip_from) ||
lua_to_ip(L, TABLE, "to", &ip_to))
return -1;
ip_from = rte_bswap32(ip_from);
ip_to = rte_bswap32(ip_to);
ret = rte_hash_lookup(ret_hash, (const void *)&ip_from);
PROX_PANIC(ret >= 0, "Key %x already exists in NAT hash table\n", ip_from);
ret = rte_hash_add_key(ret_hash, (const void *)&ip_from);
PROX_PANIC(ret < 0, "Failed to add Key %x to NAT hash table\n", ip_from);
ret_entries[ret] = ip_to;
lua_pop(L, 1);
}
lua_pop(L, pop);
*hash = ret_hash;
*entries = ret_entries;
return 0;
}
static void init_task_nat(struct task_base *tbase, struct task_args *targ)
{
struct task_nat *task = (struct task_nat *)tbase;
const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
int ret;
/* Use destination IP by default. */
task->use_src = targ->use_src;
PROX_PANIC(!strcmp(targ->nat_table, ""), "No nat table specified\n");
ret = lua_to_hash_nat(prox_lua(), GLOBAL, targ->nat_table, socket_id, &task->hash, &task->entries);
PROX_PANIC(ret != 0, "Failed to load NAT table from lua:\n%s\n", get_lua_to_errors());
struct prox_port_cfg *port = find_reachable_port(targ);
if (port) {
task->offload_crc = port->requested_tx_offload & (DEV_TX_OFFLOAD_IPV4_CKSUM | DEV_TX_OFFLOAD_UDP_CKSUM);
}
}
/* Basic static nat. */
static struct task_init task_init_nat = {
.mode_str = "nat",
.init = init_task_nat,
.handle = handle_nat_bulk,
#ifdef SOFT_CRC
.flag_features = TASK_FEATURE_TXQ_FLAGS_NOOFFLOADS,
#else
.flag_features = 0,
#endif
.size = sizeof(struct task_nat),
};
__attribute__((constructor)) static void reg_task_nat(void)
{
reg_task(&task_init_nat);
}
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