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.
19 #include "tnl-arp-cache.h"
22 #include <sys/types.h>
23 #include <netinet/in.h>
24 #include <netinet/icmp6.h>
30 #include "dpif-netdev.h"
31 #include "dynamic-string.h"
35 #include "ovs-thread.h"
37 #include "poll-loop.h"
39 #include "socket-util.h"
41 #include "unaligned.h"
44 #include "openvswitch/vlog.h"
48 #define ARP_ENTRY_DEFAULT_IDLE_TIME (15 * 60)
50 struct tnl_arp_entry {
51 struct cmap_node cmap_node;
54 time_t expires; /* Expiration time. */
55 char br_name[IFNAMSIZ];
58 static struct cmap table;
59 static struct ovs_mutex mutex = OVS_MUTEX_INITIALIZER;
62 tnl_arp_hash(const struct in6_addr *ip)
64 return hash_bytes(ip->s6_addr, 16, 0);
67 static struct tnl_arp_entry *
68 tnl_arp_lookup__(const char br_name[IFNAMSIZ], const struct in6_addr *dst)
70 struct tnl_arp_entry *arp;
73 hash = tnl_arp_hash(dst);
74 CMAP_FOR_EACH_WITH_HASH (arp, cmap_node, hash, &table) {
75 if (ipv6_addr_equals(&arp->ip, dst) && !strcmp(arp->br_name, br_name)) {
76 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
84 tnl_arp_lookup(const char br_name[IFNAMSIZ], ovs_be32 dst,
87 struct tnl_arp_entry *arp;
91 in6_addr_set_mapped_ipv4(&dst6, dst);
93 arp = tnl_arp_lookup__(br_name, &dst6);
103 tnl_nd_lookup(const char br_name[IFNAMSIZ], const struct in6_addr *dst,
104 struct eth_addr *mac)
106 struct tnl_arp_entry *arp;
109 arp = tnl_arp_lookup__(br_name, dst);
118 arp_entry_free(struct tnl_arp_entry *arp)
124 tnl_arp_delete(struct tnl_arp_entry *arp)
126 uint32_t hash = tnl_arp_hash(&arp->ip);
127 cmap_remove(&table, &arp->cmap_node, hash);
128 ovsrcu_postpone(arp_entry_free, arp);
132 tnl_arp_set__(const char name[IFNAMSIZ], const struct in6_addr *dst,
133 const struct eth_addr mac)
135 ovs_mutex_lock(&mutex);
136 struct tnl_arp_entry *arp = tnl_arp_lookup__(name, dst);
138 if (eth_addr_equals(arp->mac, mac)) {
139 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
140 ovs_mutex_unlock(&mutex);
144 seq_change(tnl_conf_seq);
147 arp = xmalloc(sizeof *arp);
151 arp->expires = time_now() + ARP_ENTRY_DEFAULT_IDLE_TIME;
152 ovs_strlcpy(arp->br_name, name, sizeof arp->br_name);
153 cmap_insert(&table, &arp->cmap_node, tnl_arp_hash(&arp->ip));
154 ovs_mutex_unlock(&mutex);
158 tnl_arp_set(const char name[IFNAMSIZ], ovs_be32 dst,
159 const struct eth_addr mac)
161 struct in6_addr dst6;
163 in6_addr_set_mapped_ipv4(&dst6, dst);
164 tnl_arp_set__(name, &dst6, mac);
168 tnl_arp_snoop(const struct flow *flow, struct flow_wildcards *wc,
169 const char name[IFNAMSIZ])
171 if (flow->dl_type != htons(ETH_TYPE_ARP)) {
175 /* Exact Match on all ARP flows. */
176 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
177 memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
178 memset(&wc->masks.arp_sha, 0xff, sizeof wc->masks.arp_sha);
180 tnl_arp_set(name, flow->nw_src, flow->arp_sha);
185 tnl_nd_snoop(const struct flow *flow, struct flow_wildcards *wc,
186 const char name[IFNAMSIZ])
188 if (flow->dl_type != htons(ETH_TYPE_IPV6) ||
189 flow->nw_proto != IPPROTO_ICMPV6 ||
190 flow->tp_dst != htons(0) ||
191 flow->tp_src != htons(ND_NEIGHBOR_ADVERT)) {
195 memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
196 memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
197 memset(&wc->masks.nd_target, 0xff, sizeof wc->masks.nd_target);
198 memset(&wc->masks.arp_tha, 0xff, sizeof wc->masks.arp_tha);
200 tnl_arp_set__(name, &flow->nd_target, flow->arp_tha);
205 tnl_arp_cache_run(void)
207 struct tnl_arp_entry *arp;
208 bool changed = false;
210 ovs_mutex_lock(&mutex);
211 CMAP_FOR_EACH(arp, cmap_node, &table) {
212 if (arp->expires <= time_now()) {
217 ovs_mutex_unlock(&mutex);
220 seq_change(tnl_conf_seq);
225 tnl_arp_cache_flush(struct unixctl_conn *conn, int argc OVS_UNUSED,
226 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
228 struct tnl_arp_entry *arp;
229 bool changed = false;
231 ovs_mutex_lock(&mutex);
232 CMAP_FOR_EACH(arp, cmap_node, &table) {
236 ovs_mutex_unlock(&mutex);
238 seq_change(tnl_conf_seq);
240 unixctl_command_reply(conn, "OK");
244 lookup_any(const char *host_name, struct in6_addr *address)
246 if (addr_is_ipv6(host_name)) {
247 return lookup_ipv6(host_name, address);
251 r = lookup_ip(host_name, &ip);
253 in6_addr_set_mapped_ipv4(address, ip.s_addr);
261 tnl_arp_cache_add(struct unixctl_conn *conn, int argc OVS_UNUSED,
262 const char *argv[], void *aux OVS_UNUSED)
264 const char *br_name = argv[1];
268 if (lookup_any(argv[2], &ip6) != 0) {
269 unixctl_command_reply_error(conn, "bad IP address");
273 if (!eth_addr_from_string(argv[3], &mac)) {
274 unixctl_command_reply_error(conn, "bad MAC address");
278 tnl_arp_set__(br_name, &ip6, mac);
279 unixctl_command_reply(conn, "OK");
283 tnl_arp_cache_show(struct unixctl_conn *conn, int argc OVS_UNUSED,
284 const char *argv[] OVS_UNUSED, void *aux OVS_UNUSED)
286 struct ds ds = DS_EMPTY_INITIALIZER;
287 struct tnl_arp_entry *arp;
289 ds_put_cstr(&ds, "IP MAC Bridge\n");
290 ds_put_cstr(&ds, "==========================================================================\n");
291 ovs_mutex_lock(&mutex);
292 CMAP_FOR_EACH(arp, cmap_node, &table) {
293 int start_len, need_ws;
295 start_len = ds.length;
296 ipv6_format_mapped(&arp->ip, &ds);
298 need_ws = INET6_ADDRSTRLEN - (ds.length - start_len);
299 ds_put_char_multiple(&ds, ' ', need_ws);
301 ds_put_format(&ds, ETH_ADDR_FMT" %s\n",
302 ETH_ADDR_ARGS(arp->mac), arp->br_name);
305 ovs_mutex_unlock(&mutex);
306 unixctl_command_reply(conn, ds_cstr(&ds));
311 tnl_arp_cache_init(void)
315 unixctl_command_register("tnl/arp/show", "", 0, 0, tnl_arp_cache_show, NULL);
316 unixctl_command_register("tnl/arp/set", "BRIDGE IP MAC", 3, 3, tnl_arp_cache_add, NULL);
317 unixctl_command_register("tnl/arp/flush", "", 0, 0, tnl_arp_cache_flush, NULL);