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2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 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.
18 #include <sys/types.h>
19 #include <netinet/in.h>
20 #include <arpa/inet.h>
23 #include <sys/socket.h>
27 #include "classifier.h"
35 #include "ofproto-provider.h"
36 #include "openflow/openflow.h"
37 #include "openvswitch/ofp-actions.h"
38 #include "openvswitch/ofpbuf.h"
39 #include "openvswitch/vlog.h"
41 #include "openvswitch/poll-loop.h"
44 VLOG_DEFINE_THIS_MODULE(in_band
);
46 /* Priorities used in classifier for in-band rules. These values are higher
47 * than any that may be set with OpenFlow, and "18" kind of looks like "IB".
48 * The ordering of priorities is not important because all of the rules set up
49 * by in-band control have the same action. The only reason to use more than
50 * one priority is to make the kind of flow easier to see during debugging. */
52 /* One set per bridge. */
53 IBR_FROM_LOCAL_DHCP
= 180000, /* (a) From local port, DHCP. */
54 IBR_TO_LOCAL_ARP
, /* (b) To local port, ARP. */
55 IBR_FROM_LOCAL_ARP
, /* (c) From local port, ARP. */
57 /* One set per unique next-hop MAC. */
58 IBR_TO_NEXT_HOP_ARP
, /* (d) To remote MAC, ARP. */
59 IBR_FROM_NEXT_HOP_ARP
, /* (e) From remote MAC, ARP. */
61 /* One set per unique remote IP address. */
62 IBR_TO_REMOTE_ARP
, /* (f) To remote IP, ARP. */
63 IBR_FROM_REMOTE_ARP
, /* (g) From remote IP, ARP. */
65 /* One set per unique remote (IP,port) pair. */
66 IBR_TO_REMOTE_TCP
, /* (h) To remote IP, TCP port. */
67 IBR_FROM_REMOTE_TCP
/* (i) From remote IP, TCP port. */
70 /* Track one remote IP and next hop information. */
71 struct in_band_remote
{
72 struct sockaddr_in remote_addr
; /* IP address, in network byte order. */
73 struct eth_addr remote_mac
; /* Next-hop MAC, all-zeros if unknown. */
74 struct eth_addr last_remote_mac
; /* Previous nonzero next-hop MAC. */
75 struct netdev
*remote_netdev
; /* Device to send to next-hop MAC. */
78 /* What to do to an in_band_rule. */
80 ADD
, /* Add the rule to ofproto's flow table. */
81 DEL
/* Delete the rule from ofproto's flow table. */
84 /* A rule to add to or delete from ofproto's flow table. */
86 struct hmap_node hmap_node
; /* In struct in_band's "rules" hmap. */
93 struct ofproto
*ofproto
;
96 /* Remote information. */
97 time_t next_remote_refresh
; /* Refresh timer. */
98 struct in_band_remote
*remotes
;
101 /* Local information. */
102 time_t next_local_refresh
; /* Refresh timer. */
103 struct eth_addr local_mac
; /* Current MAC. */
104 struct netdev
*local_netdev
; /* Local port's network device. */
107 struct hmap rules
; /* Contains "struct in_band_rule"s. */
110 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(60, 60);
113 refresh_remote(struct in_band
*ib
, struct in_band_remote
*r
)
115 struct in_addr next_hop_inaddr
;
119 /* Find the next-hop IP address. */
120 r
->remote_mac
= eth_addr_zero
;
121 retval
= netdev_get_next_hop(ib
->local_netdev
, &r
->remote_addr
.sin_addr
,
122 &next_hop_inaddr
, &next_hop_dev
);
124 VLOG_WARN_RL(&rl
, "%s: cannot find route for controller "
127 IP_ARGS(r
->remote_addr
.sin_addr
.s_addr
),
128 ovs_strerror(retval
));
131 if (!next_hop_inaddr
.s_addr
) {
132 next_hop_inaddr
= r
->remote_addr
.sin_addr
;
135 /* Open the next-hop network device. */
136 if (!r
->remote_netdev
137 || strcmp(netdev_get_name(r
->remote_netdev
), next_hop_dev
))
139 netdev_close(r
->remote_netdev
);
141 retval
= netdev_open(next_hop_dev
, NULL
, &r
->remote_netdev
);
143 VLOG_WARN_RL(&rl
, "%s: cannot open netdev %s (next hop "
144 "to controller "IP_FMT
"): %s",
145 ib
->ofproto
->name
, next_hop_dev
,
146 IP_ARGS(r
->remote_addr
.sin_addr
.s_addr
),
147 ovs_strerror(retval
));
154 /* Look up the MAC address of the next-hop IP address. */
155 retval
= netdev_arp_lookup(r
->remote_netdev
, next_hop_inaddr
.s_addr
,
158 VLOG_DBG_RL(&rl
, "%s: cannot look up remote MAC address ("IP_FMT
"): %s",
159 ib
->ofproto
->name
, IP_ARGS(next_hop_inaddr
.s_addr
),
160 ovs_strerror(retval
));
163 /* If we don't have a MAC address, then refresh quickly, since we probably
164 * will get a MAC address soon (via ARP). Otherwise, we can afford to wait
166 return eth_addr_is_zero(r
->remote_mac
) ? 1 : 10;
170 refresh_remotes(struct in_band
*ib
)
172 struct in_band_remote
*r
;
175 if (time_now() < ib
->next_remote_refresh
) {
180 ib
->next_remote_refresh
= TIME_MAX
;
181 for (r
= ib
->remotes
; r
< &ib
->remotes
[ib
->n_remotes
]; r
++) {
182 struct eth_addr old_remote_mac
;
186 old_remote_mac
= r
->remote_mac
;
188 /* Refresh remote information. */
189 next_refresh
= refresh_remote(ib
, r
) + time_now();
190 ib
->next_remote_refresh
= MIN(ib
->next_remote_refresh
, next_refresh
);
192 /* If the MAC changed, log the changes. */
193 if (!eth_addr_equals(r
->remote_mac
, old_remote_mac
)) {
195 if (!eth_addr_is_zero(r
->remote_mac
)
196 && !eth_addr_equals(r
->last_remote_mac
, r
->remote_mac
)) {
197 VLOG_DBG("%s: remote MAC address changed from "ETH_ADDR_FMT
200 ETH_ADDR_ARGS(r
->last_remote_mac
),
201 ETH_ADDR_ARGS(r
->remote_mac
));
202 r
->last_remote_mac
= r
->remote_mac
;
210 /* Refreshes the MAC address of the local port into ib->local_mac, if it is due
211 * for a refresh. Returns true if anything changed, otherwise false. */
213 refresh_local(struct in_band
*ib
)
219 if (now
< ib
->next_local_refresh
) {
222 ib
->next_local_refresh
= now
+ 1;
224 if (netdev_get_etheraddr(ib
->local_netdev
, &ea
)
225 || eth_addr_equals(ea
, ib
->local_mac
)) {
233 /* Returns true if packets in 'flow' should be directed to the local port.
234 * (This keeps the flow table from preventing DHCP replies from being seen by
235 * the local port.) */
237 in_band_must_output_to_local_port(const struct flow
*flow
)
239 return (flow
->dl_type
== htons(ETH_TYPE_IP
)
240 && flow
->nw_proto
== IPPROTO_UDP
241 && flow
->tp_src
== htons(DHCP_SERVER_PORT
)
242 && flow
->tp_dst
== htons(DHCP_CLIENT_PORT
));
245 /* Returns the number of in-band rules currently installed in the flow
248 in_band_count_rules(const struct in_band
*ib
)
250 return hmap_count(&ib
->rules
);
254 add_rule(struct in_band
*ib
, const struct match
*match
, int priority
)
256 uint32_t hash
= match_hash(match
, 0);
257 struct in_band_rule
*rule
;
259 HMAP_FOR_EACH_WITH_HASH (rule
, hmap_node
, hash
, &ib
->rules
) {
260 if (match_equal(&rule
->match
, match
)) {
266 rule
= xmalloc(sizeof *rule
);
267 rule
->match
= *match
;
268 rule
->priority
= priority
;
270 hmap_insert(&ib
->rules
, &rule
->hmap_node
, hash
);
274 update_rules(struct in_band
*ib
)
276 struct in_band_rule
*ib_rule
;
277 struct in_band_remote
*r
;
280 /* Mark all the existing rules for deletion. (Afterward we will re-add any
281 * rules that are still valid.) */
282 HMAP_FOR_EACH (ib_rule
, hmap_node
, &ib
->rules
) {
286 if (ib
->n_remotes
&& !eth_addr_is_zero(ib
->local_mac
)) {
287 /* (a) Allow DHCP requests sent from the local port. */
288 match_init_catchall(&match
);
289 match_set_in_port(&match
, OFPP_LOCAL
);
290 match_set_dl_type(&match
, htons(ETH_TYPE_IP
));
291 match_set_dl_src(&match
, ib
->local_mac
);
292 match_set_nw_proto(&match
, IPPROTO_UDP
);
293 match_set_tp_src(&match
, htons(DHCP_CLIENT_PORT
));
294 match_set_tp_dst(&match
, htons(DHCP_SERVER_PORT
));
295 add_rule(ib
, &match
, IBR_FROM_LOCAL_DHCP
);
297 /* (b) Allow ARP replies to the local port's MAC address. */
298 match_init_catchall(&match
);
299 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
300 match_set_dl_dst(&match
, ib
->local_mac
);
301 match_set_nw_proto(&match
, ARP_OP_REPLY
);
302 add_rule(ib
, &match
, IBR_TO_LOCAL_ARP
);
304 /* (c) Allow ARP requests from the local port's MAC address. */
305 match_init_catchall(&match
);
306 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
307 match_set_dl_src(&match
, ib
->local_mac
);
308 match_set_nw_proto(&match
, ARP_OP_REQUEST
);
309 add_rule(ib
, &match
, IBR_FROM_LOCAL_ARP
);
312 for (r
= ib
->remotes
; r
< &ib
->remotes
[ib
->n_remotes
]; r
++) {
313 if (eth_addr_is_zero(r
->remote_mac
)) {
317 /* (d) Allow ARP replies to the next hop's MAC address. */
318 match_init_catchall(&match
);
319 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
320 match_set_dl_dst(&match
, r
->remote_mac
);
321 match_set_nw_proto(&match
, ARP_OP_REPLY
);
322 add_rule(ib
, &match
, IBR_TO_NEXT_HOP_ARP
);
324 /* (e) Allow ARP requests from the next hop's MAC address. */
325 match_init_catchall(&match
);
326 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
327 match_set_dl_src(&match
, r
->remote_mac
);
328 match_set_nw_proto(&match
, ARP_OP_REQUEST
);
329 add_rule(ib
, &match
, IBR_FROM_NEXT_HOP_ARP
);
332 for (r
= ib
->remotes
; r
< &ib
->remotes
[ib
->n_remotes
]; r
++) {
333 const struct sockaddr_in
*a
= &r
->remote_addr
;
335 /* (f) Allow ARP replies containing the remote's IP address as a
337 match_init_catchall(&match
);
338 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
339 match_set_nw_proto(&match
, ARP_OP_REPLY
);
340 match_set_nw_dst(&match
, a
->sin_addr
.s_addr
);
341 add_rule(ib
, &match
, IBR_TO_REMOTE_ARP
);
343 /* (g) Allow ARP requests containing the remote's IP address as a
345 match_init_catchall(&match
);
346 match_set_dl_type(&match
, htons(ETH_TYPE_ARP
));
347 match_set_nw_proto(&match
, ARP_OP_REQUEST
);
348 match_set_nw_src(&match
, a
->sin_addr
.s_addr
);
349 add_rule(ib
, &match
, IBR_FROM_REMOTE_ARP
);
351 /* (h) Allow TCP traffic to the remote's IP and port. */
352 match_init_catchall(&match
);
353 match_set_dl_type(&match
, htons(ETH_TYPE_IP
));
354 match_set_nw_proto(&match
, IPPROTO_TCP
);
355 match_set_nw_dst(&match
, a
->sin_addr
.s_addr
);
356 match_set_tp_dst(&match
, a
->sin_port
);
357 add_rule(ib
, &match
, IBR_TO_REMOTE_TCP
);
359 /* (i) Allow TCP traffic from the remote's IP and port. */
360 match_init_catchall(&match
);
361 match_set_dl_type(&match
, htons(ETH_TYPE_IP
));
362 match_set_nw_proto(&match
, IPPROTO_TCP
);
363 match_set_nw_src(&match
, a
->sin_addr
.s_addr
);
364 match_set_tp_src(&match
, a
->sin_port
);
365 add_rule(ib
, &match
, IBR_FROM_REMOTE_TCP
);
369 /* Updates the OpenFlow flow table for the current state of in-band control.
370 * Returns true ordinarily. Returns false if no remotes are configured on 'ib'
371 * and 'ib' doesn't have any rules left to remove from the OpenFlow flow
372 * table. Thus, a false return value means that the caller can destroy 'ib'
373 * without leaving extra flows hanging around in the flow table. */
375 in_band_run(struct in_band
*ib
)
377 uint64_t ofpacts_stub
[128 / 8];
378 struct ofpbuf ofpacts
;
380 struct in_band_rule
*rule
, *next
;
382 ofpbuf_use_stub(&ofpacts
, ofpacts_stub
, sizeof ofpacts_stub
);
384 if (ib
->queue_id
>= 0) {
385 ofpact_put_SET_QUEUE(&ofpacts
)->queue_id
= ib
->queue_id
;
387 ofpact_put_OUTPUT(&ofpacts
)->port
= OFPP_NORMAL
;
394 HMAP_FOR_EACH_SAFE (rule
, next
, hmap_node
, &ib
->rules
) {
397 ofproto_add_flow(ib
->ofproto
, &rule
->match
, rule
->priority
,
398 ofpacts
.data
, ofpacts
.size
);
402 ovs_mutex_lock(&ofproto_mutex
);
403 ofproto_delete_flow(ib
->ofproto
, &rule
->match
, rule
->priority
);
404 ovs_mutex_unlock(&ofproto_mutex
);
405 hmap_remove(&ib
->rules
, &rule
->hmap_node
);
411 ofpbuf_uninit(&ofpacts
);
413 return ib
->n_remotes
|| !hmap_is_empty(&ib
->rules
);
417 in_band_wait(struct in_band
*in_band
)
420 = MIN(in_band
->next_remote_refresh
, in_band
->next_local_refresh
);
421 poll_timer_wait_until(wakeup
* 1000);
425 in_band_create(struct ofproto
*ofproto
, const char *local_name
,
426 struct in_band
**in_bandp
)
428 struct in_band
*in_band
;
429 struct netdev
*local_netdev
;
431 const char *type
= ofproto_port_open_type(ofproto
, "internal");
434 error
= netdev_open(local_name
, type
, &local_netdev
);
436 VLOG_ERR("%s: failed to initialize in-band control: cannot open "
437 "datapath local port %s (%s)", ofproto
->name
,
438 local_name
, ovs_strerror(error
));
442 in_band
= xzalloc(sizeof *in_band
);
443 in_band
->ofproto
= ofproto
;
444 in_band
->queue_id
= -1;
445 in_band
->next_remote_refresh
= TIME_MIN
;
446 in_band
->next_local_refresh
= TIME_MIN
;
447 in_band
->local_netdev
= local_netdev
;
448 hmap_init(&in_band
->rules
);
456 in_band_destroy(struct in_band
*ib
)
459 struct in_band_rule
*rule
;
461 HMAP_FOR_EACH_POP (rule
, hmap_node
, &ib
->rules
) {
464 hmap_destroy(&ib
->rules
);
465 in_band_set_remotes(ib
, NULL
, 0);
466 netdev_close(ib
->local_netdev
);
472 any_addresses_changed(struct in_band
*ib
,
473 const struct sockaddr_in
*addresses
, size_t n
)
477 if (n
!= ib
->n_remotes
) {
481 for (i
= 0; i
< n
; i
++) {
482 const struct sockaddr_in
*old
= &ib
->remotes
[i
].remote_addr
;
483 const struct sockaddr_in
*new = &addresses
[i
];
485 if (old
->sin_addr
.s_addr
!= new->sin_addr
.s_addr
||
486 old
->sin_port
!= new->sin_port
) {
495 in_band_set_remotes(struct in_band
*ib
,
496 const struct sockaddr_in
*addresses
, size_t n
)
500 if (!any_addresses_changed(ib
, addresses
, n
)) {
504 /* Clear old remotes. */
505 for (i
= 0; i
< ib
->n_remotes
; i
++) {
506 netdev_close(ib
->remotes
[i
].remote_netdev
);
510 /* Set up new remotes. */
511 ib
->remotes
= n
? xzalloc(n
* sizeof *ib
->remotes
) : NULL
;
513 for (i
= 0; i
< n
; i
++) {
514 ib
->remotes
[i
].remote_addr
= addresses
[i
];
517 /* Force refresh in next call to in_band_run(). */
518 ib
->next_remote_refresh
= TIME_MIN
;
521 /* Sets the OpenFlow queue used by flows set up by 'ib' to 'queue_id'. If
522 * 'queue_id' is negative, 'ib' will not set any queue (which is also the
525 in_band_set_queue(struct in_band
*ib
, int queue_id
)
527 ib
->queue_id
= queue_id
;