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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 "task_init.h"
#include "task_base.h"
#include "stats.h"
#include "arp.h"
#include "etypes.h"
#include "quit.h"
#include "log.h"
#include "prox_port_cfg.h"
#include "lconf.h"
#include "cmd_parser.h"
#include "handle_arp.h"
struct task_arp {
struct task_base base;
prox_rte_ether_addr src_mac;
uint32_t seed;
uint32_t flags;
uint32_t ip;
uint32_t tmp_ip;
uint8_t arp_replies_ring;
uint8_t other_pkts_ring;
uint8_t send_arp_requests;
};
static void task_update_config(struct task_arp *task)
{
if (unlikely(task->ip != task->tmp_ip))
task->ip = task->tmp_ip;
}
static void handle_arp(struct task_arp *task, struct ether_hdr_arp *hdr, prox_rte_ether_addr *s_addr)
{
build_arp_reply((prox_rte_ether_hdr *)hdr, s_addr, &hdr->arp);
}
static int handle_arp_bulk(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
struct ether_hdr_arp *hdr;
struct task_arp *task = (struct task_arp *)tbase;
uint8_t out[MAX_PKT_BURST] = {0};
struct rte_mbuf *replies_mbufs[64] = {0}, *arp_pkt_mbufs[64] = {0};
int n_arp_reply_pkts = 0, n_other_pkts = 0,n_arp_pkts = 0;
prox_rte_ether_addr s_addr;
for (uint16_t j = 0; j < n_pkts; ++j) {
hdr = rte_pktmbuf_mtod(mbufs[j], struct ether_hdr_arp *);
if (hdr->ether_hdr.ether_type == ETYPE_ARP) {
if (arp_is_gratuitous(&hdr->arp)) {
out[n_other_pkts] = OUT_DISCARD;
n_other_pkts++;
plog_info("Received gratuitous packet \n");
} else if (hdr->arp.oper == 0x100) {
if (task->arp_replies_ring != OUT_DISCARD) {
arp_pkt_mbufs[n_arp_pkts] = mbufs[j];
out[n_arp_pkts] = task->arp_replies_ring;
n_arp_pkts++;
} else if (task->ip == 0) {
create_mac(&hdr->arp, &s_addr);
handle_arp(task, hdr, &s_addr);
replies_mbufs[n_arp_reply_pkts] = mbufs[j];
out[n_arp_reply_pkts] = 0;
n_arp_reply_pkts++;
} else if (hdr->arp.data.tpa == task->ip) {
handle_arp(task, hdr, &task->src_mac);
replies_mbufs[n_arp_reply_pkts] = mbufs[j];
out[n_arp_reply_pkts] = 0;
n_arp_reply_pkts++;
} else {
out[n_other_pkts] = OUT_DISCARD;
mbufs[n_other_pkts] = mbufs[j];
n_other_pkts++;
plogx_dbg("Received ARP on unexpected IP %x, expecting %x\n", rte_be_to_cpu_32(hdr->arp.data.tpa), rte_be_to_cpu_32(task->ip));
}
} else if (hdr->arp.oper == 0x200) {
arp_pkt_mbufs[n_arp_pkts] = mbufs[j];
out[n_arp_pkts] = task->arp_replies_ring;
n_arp_pkts++;
} else {
out[n_other_pkts] = task->other_pkts_ring;
mbufs[n_other_pkts] = mbufs[j];
n_other_pkts++;
}
} else {
out[n_other_pkts] = task->other_pkts_ring;
mbufs[n_other_pkts] = mbufs[j];
n_other_pkts++;
}
}
int ret = 0;
if (n_arp_reply_pkts) {
ret+=task->base.aux->tx_pkt_hw(&task->base, replies_mbufs, n_arp_reply_pkts, out);
}
if (n_arp_pkts)
ret+= task->base.tx_pkt(&task->base, arp_pkt_mbufs, n_arp_pkts, out);
ret+= task->base.tx_pkt(&task->base, mbufs, n_other_pkts, out);
task_update_config(task);
return ret;
}
void task_arp_set_local_ip(struct task_base *tbase, uint32_t ip)
{
struct task_arp *task = (struct task_arp *)tbase;
task->tmp_ip = ip;
}
static void init_task_arp(struct task_base *tbase, struct task_args *targ)
{
struct task_arp *task = (struct task_arp *)tbase;
struct task_args *dtarg;
struct core_task ct;
int port_found = 0;
task->other_pkts_ring = OUT_DISCARD;
task->arp_replies_ring = OUT_DISCARD;
task->seed = rte_rdtsc();
memcpy(&task->src_mac, &prox_port_cfg[task->base.tx_params_hw_sw.tx_port_queue.port].eth_addr, sizeof(prox_rte_ether_addr));
task->ip = rte_cpu_to_be_32(targ->local_ipv4);
task->tmp_ip = task->ip;
PROX_PANIC(targ->nb_txrings > targ->core_task_set[0].n_elems, "%d txrings but %d elems in task_set\n", targ->nb_txrings, targ->core_task_set[0].n_elems);
for (uint32_t i = 0; i < targ->nb_txrings; ++i) {
ct = targ->core_task_set[0].core_task[i];
plog_info("ARP mode checking whether core %d task %d (i.e. ring %d) can handle arp\n", ct.core, ct.task, i);
dtarg = core_targ_get(ct.core, ct.task);
dtarg = find_reachable_task_sending_to_port(dtarg);
if ((dtarg != NULL) && (task_is_sub_mode(dtarg->lconf->id, dtarg->id, "l3"))) {
plog_info("ARP task sending ARP replies to core %d and task %d to handle them\n", ct.core, ct.task);
task->arp_replies_ring = i;
} else {
plog_info("ARP task sending (potentially other) packets to core %d and task %d\n", ct.core, ct.task);
task->other_pkts_ring = i;
}
}
if ((targ->nb_txports == 0) && (task->arp_replies_ring == OUT_DISCARD)) {
PROX_PANIC(1, "arp mode must have a tx_port or a ring able to a task in l3 reaching tx port");
}
}
// Reply to ARP requests with random MAC addresses
static struct task_init task_init_cpe_arp = {
.mode_str = "arp",
.init = init_task_arp,
.handle = handle_arp_bulk,
.size = sizeof(struct task_arp)
};
// Reply to ARP requests with MAC address of the interface
static struct task_init task_init_arp = {
.mode_str = "arp",
.sub_mode_str = "local",
.init = init_task_arp,
.handle = handle_arp_bulk,
.size = sizeof(struct task_arp)
};
__attribute__((constructor)) static void reg_task_arp(void)
{
reg_task(&task_init_cpe_arp);
reg_task(&task_init_arp);
}
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