2 * Copyright (c) 2014, 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
24 #include "dpif-netdev.h"
25 #include "dynamic-string.h"
29 #include "ovs-thread.h"
31 #include "poll-loop.h"
33 #include "socket-util.h"
35 #include "tnl-arp-cache.h"
36 #include "unaligned.h"
39 #include "openvswitch/vlog.h"
43 #define ARP_ENTRY_DEFAULT_IDLE_TIME (15 * 60)
45 struct tnl_arp_entry {
46 struct cmap_node cmap_node;
49 time_t expires; /* Expiration time. */
50 char br_name[IFNAMSIZ];
53 static struct cmap table;
54 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
56 static struct tnl_arp_entry *
57 tnl_arp_lookup__(const char br_name[IFNAMSIZ], ovs_be32 dst)
59 struct tnl_arp_entry *arp;
61 CMAP_FOR_EACH_WITH_HASH (arp, cmap_node, (OVS_FORCE uint32_t) dst, &table) {
62 if (arp->ip == dst && !strcmp(arp->br_name, br_name)) {
63 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
71 tnl_arp_lookup(const char br_name[IFNAMSIZ], ovs_be32 dst,
74 struct tnl_arp_entry *arp;
77 arp = tnl_arp_lookup__(br_name, dst);
87 arp_entry_free(struct tnl_arp_entry *arp)
93 tnl_arp_delete(struct tnl_arp_entry *arp)
95 cmap_remove(&table, &arp->cmap_node, (OVS_FORCE uint32_t) arp->ip);
96 ovsrcu_postpone(arp_entry_free, arp);
100 tnl_arp_set(const char name[IFNAMSIZ], ovs_be32 dst, const struct eth_addr mac)
102 ovs_mutex_lock(&mutex);
103 struct tnl_arp_entry *arp = tnl_arp_lookup__(name, dst);
105 if (eth_addr_equals(arp->mac, mac)) {
106 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
107 ovs_mutex_unlock(&mutex);
111 seq_change(tnl_conf_seq);
114 arp = xmalloc(sizeof *arp);
118 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
119 ovs_strlcpy(arp->br_name, name, sizeof arp->br_name);
120 cmap_insert(&table, &arp->cmap_node, (OVS_FORCE uint32_t) arp->ip);
121 ovs_mutex_unlock(&mutex);
125 tnl_arp_snoop(const struct flow *flow, struct flow_wildcards *wc,
126 const char name[IFNAMSIZ])
128 if (flow->dl_type != htons(ETH_TYPE_ARP)) {
132 /* Exact Match on all ARP flows. */
133 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
134 memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
135 memset(&wc->masks.arp_sha, 0xff, sizeof wc->masks.arp_sha);
137 tnl_arp_set(name, flow->nw_src, flow->arp_sha);
143 tnl_arp_cache_run(void)
145 struct tnl_arp_entry *arp;
146 bool changed = false;
148 ovs_mutex_lock(&mutex);
149 CMAP_FOR_EACH(arp, cmap_node, &table) {
150 if (arp->expires <= time_now()) {
155 ovs_mutex_unlock(&mutex);
158 seq_change(tnl_conf_seq);
163 tnl_arp_cache_flush(struct unixctl_conn *conn, int argc OVS_UNUSED,
164 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
166 struct tnl_arp_entry *arp;
167 bool changed = false;
169 ovs_mutex_lock(&mutex);
170 CMAP_FOR_EACH(arp, cmap_node, &table) {
174 ovs_mutex_unlock(&mutex);
176 seq_change(tnl_conf_seq);
178 unixctl_command_reply(conn, "OK");
182 tnl_arp_cache_add(struct unixctl_conn *conn, int argc OVS_UNUSED,
183 const char *argv[], void *aux OVS_UNUSED)
185 const char *br_name = argv[1];
189 if (lookup_ip(argv[2], &ip)) {
190 unixctl_command_reply_error(conn, "bad IP address");
194 if (!eth_addr_from_string(argv[3], &mac)) {
195 unixctl_command_reply_error(conn, "bad MAC address");
199 tnl_arp_set(br_name, ip.s_addr, mac);
200 unixctl_command_reply(conn, "OK");
203 #define MAX_IP_ADDR_LEN 17
206 tnl_arp_cache_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
207 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
209 struct ds ds = DS_EMPTY_INITIALIZER;
210 struct tnl_arp_entry *arp;
212 ds_put_cstr(&ds, "IP MAC Bridge\n");
213 ds_put_cstr(&ds, "=============================================\n");
214 ovs_mutex_lock(&mutex);
215 CMAP_FOR_EACH(arp, cmap_node, &table) {
216 int start_len, need_ws;
218 start_len = ds.length;
219 ds_put_format(&ds, IP_FMT, IP_ARGS(arp->ip));
221 need_ws = MAX_IP_ADDR_LEN - (ds.length - start_len);
222 ds_put_char_multiple(&ds, ' ', need_ws);
224 ds_put_format(&ds, ETH_ADDR_FMT" %s\n",
225 ETH_ADDR_ARGS(arp->mac), arp->br_name);
228 ovs_mutex_unlock(&mutex);
229 unixctl_command_reply(conn, ds_cstr(&ds));
234 tnl_arp_cache_init(void)
238 unixctl_command_register("tnl/arp/show", "", 0, 0, tnl_arp_cache_show, NULL);
239 unixctl_command_register("tnl/arp/set", "BRIDGE IP MAC", 3, 3, tnl_arp_cache_add, NULL);
240 unixctl_command_register("tnl/arp/flush", "", 0, 0, tnl_arp_cache_flush, NULL);