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/*
* Copyright (c) 2014, 2015 Nicira, Inc.
*
* 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 <config.h>
#include <inttypes.h>
#include <stdlib.h>
#include "bitmap.h"
#include "cmap.h"
#include "coverage.h"
#include "dpif-netdev.h"
#include "dynamic-string.h"
#include "errno.h"
#include "flow.h"
#include "netdev.h"
#include "ovs-thread.h"
#include "packets.h"
#include "poll-loop.h"
#include "seq.h"
#include "timeval.h"
#include "tnl-arp-cache.h"
#include "unaligned.h"
#include "unixctl.h"
#include "util.h"
#include "openvswitch/vlog.h"
/* In seconds */
#define ARP_ENTRY_DEFAULT_IDLE_TIME (15 * 60)
struct tnl_arp_entry {
struct cmap_node cmap_node;
ovs_be32 ip;
uint8_t mac[ETH_ADDR_LEN];
time_t expires; /* Expiration time. */
char br_name[IFNAMSIZ];
};
static struct cmap table;
static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
static struct tnl_arp_entry *
tnl_arp_lookup__(const char br_name[IFNAMSIZ], ovs_be32 dst)
{
struct tnl_arp_entry *arp;
CMAP_FOR_EACH_WITH_HASH (arp, cmap_node, (OVS_FORCE uint32_t) dst, &table) {
if (arp->ip == dst && !strcmp(arp->br_name, br_name)) {
arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
return arp;
}
}
return NULL;
}
int
tnl_arp_lookup(const char br_name[IFNAMSIZ], ovs_be32 dst,
uint8_t mac[ETH_ADDR_LEN])
{
struct tnl_arp_entry *arp;
int res = ENOENT;
arp = tnl_arp_lookup__(br_name, dst);
if (arp) {
memcpy(mac, arp->mac, ETH_ADDR_LEN);
res = 0;
}
return res;
}
static void
arp_entry_free(struct tnl_arp_entry *arp)
{
free(arp);
}
static void
tnl_arp_delete(struct tnl_arp_entry *arp)
{
cmap_remove(&table, &arp->cmap_node, (OVS_FORCE uint32_t) arp->ip);
ovsrcu_postpone(arp_entry_free, arp);
}
int
tnl_arp_snoop(const struct flow *flow, struct flow_wildcards *wc,
const char name[IFNAMSIZ])
{
struct tnl_arp_entry *arp;
if (flow->dl_type != htons(ETH_TYPE_ARP)) {
return EINVAL;
}
/* Exact Match on all ARP flows. */
memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
memset(&wc->masks.arp_sha, 0xff, sizeof wc->masks.arp_sha);
ovs_mutex_lock(&mutex);
arp = tnl_arp_lookup__(name, flow->nw_src);
if (arp) {
if (!memcmp(arp->mac, flow->arp_sha, ETH_ADDR_LEN)) {
arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
ovs_mutex_unlock(&mutex);
return 0;
}
tnl_arp_delete(arp);
seq_change(tnl_conf_seq);
}
arp = xmalloc(sizeof *arp);
arp->ip = flow->nw_src;
memcpy(arp->mac, flow->arp_sha, ETH_ADDR_LEN);
arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
ovs_strlcpy(arp->br_name, name, sizeof arp->br_name);
cmap_insert(&table, &arp->cmap_node, (OVS_FORCE uint32_t) arp->ip);
ovs_mutex_unlock(&mutex);
return 0;
}
void
tnl_arp_cache_run(void)
{
struct tnl_arp_entry *arp;
bool changed = false;
ovs_mutex_lock(&mutex);
CMAP_FOR_EACH(arp, cmap_node, &table) {
if (arp->expires <= time_now()) {
tnl_arp_delete(arp);
changed = true;
}
}
ovs_mutex_unlock(&mutex);
if (changed) {
seq_change(tnl_conf_seq);
}
}
static void
tnl_arp_cache_flush(struct unixctl_conn *conn OVS_UNUSED, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
struct tnl_arp_entry *arp;
bool changed = false;
ovs_mutex_lock(&mutex);
CMAP_FOR_EACH(arp, cmap_node, &table) {
tnl_arp_delete(arp);
changed = true;
}
ovs_mutex_unlock(&mutex);
if (changed) {
seq_change(tnl_conf_seq);
}
unixctl_command_reply(conn, "OK");
}
#define MAX_IP_ADDR_LEN 17
static void
tnl_arp_cache_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
{
struct ds ds = DS_EMPTY_INITIALIZER;
struct tnl_arp_entry *arp;
ds_put_cstr(&ds, "IP MAC Bridge\n");
ds_put_cstr(&ds, "=============================================\n");
ovs_mutex_lock(&mutex);
CMAP_FOR_EACH(arp, cmap_node, &table) {
int start_len, need_ws;
start_len = ds.length;
ds_put_format(&ds, IP_FMT, IP_ARGS(arp->ip));
need_ws = MAX_IP_ADDR_LEN - (ds.length - start_len);
ds_put_char_multiple(&ds, ' ', need_ws);
ds_put_format(&ds, ETH_ADDR_FMT" %s\n",
ETH_ADDR_ARGS(arp->mac), arp->br_name);
}
ovs_mutex_unlock(&mutex);
unixctl_command_reply(conn, ds_cstr(&ds));
ds_destroy(&ds);
}
void
tnl_arp_cache_init(void)
{
cmap_init(&table);
unixctl_command_register("tnl/arp/show", "", 0, 0, tnl_arp_cache_show, NULL);
unixctl_command_register("tnl/arp/flush", "", 0, 0, tnl_arp_cache_flush, NULL);
}
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