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-neigh-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 NEIGH_ENTRY_DEFAULT_IDLE_TIME (15 * 60)
50 struct tnl_neigh_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_neigh_hash(const struct in6_addr
*ip
)
64 return hash_bytes(ip
->s6_addr
, 16, 0);
67 static struct tnl_neigh_entry
*
68 tnl_neigh_lookup__(const char br_name
[IFNAMSIZ
], const struct in6_addr
*dst
)
70 struct tnl_neigh_entry
*neigh
;
73 hash
= tnl_neigh_hash(dst
);
74 CMAP_FOR_EACH_WITH_HASH (neigh
, cmap_node
, hash
, &table
) {
75 if (ipv6_addr_equals(&neigh
->ip
, dst
) && !strcmp(neigh
->br_name
, br_name
)) {
76 neigh
->expires
= time_now() + NEIGH_ENTRY_DEFAULT_IDLE_TIME
;
84 tnl_arp_lookup(const char br_name
[IFNAMSIZ
], ovs_be32 dst
,
87 struct tnl_neigh_entry
*neigh
;
89 struct in6_addr dst6
= in6_addr_mapped_ipv4(dst
);
91 neigh
= tnl_neigh_lookup__(br_name
, &dst6
);
101 tnl_neigh_lookup(const char br_name
[IFNAMSIZ
], const struct in6_addr
*dst
,
102 struct eth_addr
*mac
)
104 struct tnl_neigh_entry
*neigh
;
107 neigh
= tnl_neigh_lookup__(br_name
, dst
);
116 neigh_entry_free(struct tnl_neigh_entry
*neigh
)
122 tnl_neigh_delete(struct tnl_neigh_entry
*neigh
)
124 uint32_t hash
= tnl_neigh_hash(&neigh
->ip
);
125 cmap_remove(&table
, &neigh
->cmap_node
, hash
);
126 ovsrcu_postpone(neigh_entry_free
, neigh
);
130 tnl_neigh_set__(const char name
[IFNAMSIZ
], const struct in6_addr
*dst
,
131 const struct eth_addr mac
)
133 ovs_mutex_lock(&mutex
);
134 struct tnl_neigh_entry
*neigh
= tnl_neigh_lookup__(name
, dst
);
136 if (eth_addr_equals(neigh
->mac
, mac
)) {
137 neigh
->expires
= time_now() + NEIGH_ENTRY_DEFAULT_IDLE_TIME
;
138 ovs_mutex_unlock(&mutex
);
141 tnl_neigh_delete(neigh
);
142 seq_change(tnl_conf_seq
);
145 neigh
= xmalloc(sizeof *neigh
);
149 neigh
->expires
= time_now() + NEIGH_ENTRY_DEFAULT_IDLE_TIME
;
150 ovs_strlcpy(neigh
->br_name
, name
, sizeof neigh
->br_name
);
151 cmap_insert(&table
, &neigh
->cmap_node
, tnl_neigh_hash(&neigh
->ip
));
152 ovs_mutex_unlock(&mutex
);
156 tnl_arp_set(const char name
[IFNAMSIZ
], ovs_be32 dst
,
157 const struct eth_addr mac
)
159 struct in6_addr dst6
= in6_addr_mapped_ipv4(dst
);
160 tnl_neigh_set__(name
, &dst6
, mac
);
164 tnl_arp_snoop(const struct flow
*flow
, struct flow_wildcards
*wc
,
165 const char name
[IFNAMSIZ
])
167 if (flow
->dl_type
!= htons(ETH_TYPE_ARP
)) {
171 /* Exact Match on all ARP flows. */
172 memset(&wc
->masks
.nw_proto
, 0xff, sizeof wc
->masks
.nw_proto
);
173 memset(&wc
->masks
.nw_src
, 0xff, sizeof wc
->masks
.nw_src
);
174 memset(&wc
->masks
.arp_sha
, 0xff, sizeof wc
->masks
.arp_sha
);
176 tnl_arp_set(name
, flow
->nw_src
, flow
->arp_sha
);
181 tnl_nd_snoop(const struct flow
*flow
, struct flow_wildcards
*wc
,
182 const char name
[IFNAMSIZ
])
184 if (flow
->dl_type
!= htons(ETH_TYPE_IPV6
) ||
185 flow
->nw_proto
!= IPPROTO_ICMPV6
||
186 flow
->tp_dst
!= htons(0) ||
187 flow
->tp_src
!= htons(ND_NEIGHBOR_ADVERT
)) {
191 memset(&wc
->masks
.ipv6_src
, 0xff, sizeof wc
->masks
.ipv6_src
);
192 memset(&wc
->masks
.ipv6_dst
, 0xff, sizeof wc
->masks
.ipv6_dst
);
193 memset(&wc
->masks
.nd_target
, 0xff, sizeof wc
->masks
.nd_target
);
194 memset(&wc
->masks
.arp_tha
, 0xff, sizeof wc
->masks
.arp_tha
);
196 tnl_neigh_set__(name
, &flow
->nd_target
, flow
->arp_tha
);
201 tnl_neigh_snoop(const struct flow
*flow
, struct flow_wildcards
*wc
,
202 const char name
[IFNAMSIZ
])
205 res
= tnl_arp_snoop(flow
, wc
, name
);
209 return tnl_nd_snoop(flow
, wc
, name
);
213 tnl_neigh_cache_run(void)
215 struct tnl_neigh_entry
*neigh
;
216 bool changed
= false;
218 ovs_mutex_lock(&mutex
);
219 CMAP_FOR_EACH(neigh
, cmap_node
, &table
) {
220 if (neigh
->expires
<= time_now()) {
221 tnl_neigh_delete(neigh
);
225 ovs_mutex_unlock(&mutex
);
228 seq_change(tnl_conf_seq
);
233 tnl_neigh_cache_flush(struct unixctl_conn
*conn
, int argc OVS_UNUSED
,
234 const char *argv
[] OVS_UNUSED
, void *aux OVS_UNUSED
)
236 struct tnl_neigh_entry
*neigh
;
237 bool changed
= false;
239 ovs_mutex_lock(&mutex
);
240 CMAP_FOR_EACH(neigh
, cmap_node
, &table
) {
241 tnl_neigh_delete(neigh
);
244 ovs_mutex_unlock(&mutex
);
246 seq_change(tnl_conf_seq
);
248 unixctl_command_reply(conn
, "OK");
252 lookup_any(const char *host_name
, struct in6_addr
*address
)
254 if (addr_is_ipv6(host_name
)) {
255 return lookup_ipv6(host_name
, address
);
259 r
= lookup_ip(host_name
, &ip
);
261 in6_addr_set_mapped_ipv4(address
, ip
.s_addr
);
269 tnl_neigh_cache_add(struct unixctl_conn
*conn
, int argc OVS_UNUSED
,
270 const char *argv
[], void *aux OVS_UNUSED
)
272 const char *br_name
= argv
[1];
276 if (lookup_any(argv
[2], &ip6
) != 0) {
277 unixctl_command_reply_error(conn
, "bad IP address");
281 if (!eth_addr_from_string(argv
[3], &mac
)) {
282 unixctl_command_reply_error(conn
, "bad MAC address");
286 tnl_neigh_set__(br_name
, &ip6
, mac
);
287 unixctl_command_reply(conn
, "OK");
291 tnl_neigh_cache_show(struct unixctl_conn
*conn
, int argc OVS_UNUSED
,
292 const char *argv
[] OVS_UNUSED
, void *aux OVS_UNUSED
)
294 struct ds ds
= DS_EMPTY_INITIALIZER
;
295 struct tnl_neigh_entry
*neigh
;
297 ds_put_cstr(&ds
, "IP MAC Bridge\n");
298 ds_put_cstr(&ds
, "==========================================================================\n");
299 ovs_mutex_lock(&mutex
);
300 CMAP_FOR_EACH(neigh
, cmap_node
, &table
) {
301 int start_len
, need_ws
;
303 start_len
= ds
.length
;
304 ipv6_format_mapped(&neigh
->ip
, &ds
);
306 need_ws
= INET6_ADDRSTRLEN
- (ds
.length
- start_len
);
307 ds_put_char_multiple(&ds
, ' ', need_ws
);
309 ds_put_format(&ds
, ETH_ADDR_FMT
" %s\n",
310 ETH_ADDR_ARGS(neigh
->mac
), neigh
->br_name
);
313 ovs_mutex_unlock(&mutex
);
314 unixctl_command_reply(conn
, ds_cstr(&ds
));
319 tnl_neigh_cache_init(void)
323 unixctl_command_register("tnl/arp/show", "", 0, 0, tnl_neigh_cache_show
, NULL
);
324 unixctl_command_register("tnl/arp/set", "BRIDGE IP MAC", 3, 3, tnl_neigh_cache_add
, NULL
);
325 unixctl_command_register("tnl/arp/flush", "", 0, 0, tnl_neigh_cache_flush
, NULL
);
326 unixctl_command_register("tnl/neigh/show", "", 0, 0, tnl_neigh_cache_show
, NULL
);
327 unixctl_command_register("tnl/neigh/set", "BRIDGE IP MAC", 3, 3, tnl_neigh_cache_add
, NULL
);
328 unixctl_command_register("tnl/neigh/flush", "", 0, 0, tnl_neigh_cache_flush
, NULL
);