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git.proxmox.com Git - ovs.git/blob - ofproto/in-band.c
4efcbca66359fa1f3d189cf63068741a0899ef60
2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
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 <arpa/inet.h>
28 #include "mac-learning.h"
31 #include "ofp-print.h"
34 #include "openflow/openflow.h"
35 #include "openvswitch/datapath-protocol.h"
37 #include "poll-loop.h"
43 #define THIS_MODULE VLM_in_band
46 /* In-band control allows a single network to be used for OpenFlow
47 * traffic and other data traffic. Refer to ovs-vswitchd.conf(5) and
48 * secchan(8) for a description of configuring in-band control.
50 * This comment is an attempt to describe how in-band control works at a
51 * wire- and implementation-level. Correctly implementing in-band
52 * control has proven difficult due to its many subtleties, and has thus
53 * gone through many iterations. Please read through and understand the
54 * reasoning behind the chosen rules before making modifications.
56 * In Open vSwitch, in-band control is implemented as "hidden" flows (in
57 * that they are not visible through OpenFlow) and at a higher priority
58 * than wildcarded flows can be set up by the controller. This is done
59 * so that the controller cannot interfere with them and possibly break
60 * connectivity with its switches. It is possible to see all flows,
61 * including in-band ones, with the ovs-appctl "bridge/dump-flows"
64 * The following rules are always enabled with the "normal" action by a
65 * switch with in-band control:
67 * a. DHCP requests sent from the local port.
68 * b. ARP replies to the local port's MAC address.
69 * c. ARP requests from the local port's MAC address.
70 * d. ARP replies to the remote side's MAC address. Note that the
71 * remote side is either the controller or the gateway to reach
73 * e. ARP requests from the remote side's MAC address. Note that
74 * like (d), the MAC is either for the controller or gateway.
75 * f. ARP replies containing the controller's IP address as a target.
76 * g. ARP requests containing the controller's IP address as a source.
77 * h. OpenFlow (6633/tcp) traffic to the controller's IP.
78 * i. OpenFlow (6633/tcp) traffic from the controller's IP.
80 * The goal of these rules is to be as narrow as possible to allow a
81 * switch to join a network and be able to communicate with a
82 * controller. As mentioned earlier, these rules have higher priority
83 * than the controller's rules, so if they are too broad, they may
84 * prevent the controller from implementing its policy. As such,
85 * in-band actively monitors some aspects of flow and packet processing
86 * so that the rules can be made more precise.
88 * In-band control monitors attempts to add flows into the datapath that
89 * could interfere with its duties. The datapath only allows exact
90 * match entries, so in-band control is able to be very precise about
91 * the flows it prevents. Flows that miss in the datapath are sent to
92 * userspace to be processed, so preventing these flows from being
93 * cached in the "fast path" does not affect correctness. The only type
94 * of flow that is currently prevented is one that would prevent DHCP
95 * replies from being seen by the local port. For example, a rule that
96 * forwarded all DHCP traffic to the controller would not be allowed,
97 * but one that forwarded to all ports (including the local port) would.
99 * As mentioned earlier, packets that miss in the datapath are sent to
100 * the userspace for processing. The userspace has its own flow table,
101 * the "classifier", so in-band checks whether any special processing
102 * is needed before the classifier is consulted. If a packet is a DHCP
103 * response to a request from the local port, the packet is forwarded to
104 * the local port, regardless of the flow table. Note that this requires
105 * L7 processing of DHCP replies to determine whether the 'chaddr' field
106 * matches the MAC address of the local port.
108 * It is interesting to note that for an L3-based in-band control
109 * mechanism, the majority of rules are devoted to ARP traffic. At first
110 * glance, some of these rules appear redundant. However, each serves an
111 * important role. First, in order to determine the MAC address of the
112 * remote side (controller or gateway) for other ARP rules, we must allow
113 * ARP traffic for our local port with rules (b) and (c). If we are
114 * between a switch and its connection to the controller, we have to
115 * allow the other switch's ARP traffic to through. This is done with
116 * rules (d) and (e), since we do not know the addresses of the other
117 * switches a priori, but do know the controller's or gateway's. Finally,
118 * if the controller is running in a local guest VM that is not reached
119 * through the local port, the switch that is connected to the VM must
120 * allow ARP traffic based on the controller's IP address, since it will
121 * not know the MAC address of the local port that is sending the traffic
122 * or the MAC address of the controller in the guest VM.
124 * With a few notable exceptions below, in-band should work in most
125 * network setups. The following are considered "supported' in the
126 * current implementation:
128 * - Locally Connected. The switch and controller are on the same
129 * subnet. This uses rules (a), (b), (c), (h), and (i).
131 * - Reached through Gateway. The switch and controller are on
132 * different subnets and must go through a gateway. This uses
133 * rules (a), (b), (c), (h), and (i).
135 * - Between Switch and Controller. This switch is between another
136 * switch and the controller, and we want to allow the other
137 * switch's traffic through. This uses rules (d), (e), (h), and
138 * (i). It uses (b) and (c) indirectly in order to know the MAC
139 * address for rules (d) and (e). Note that DHCP for the other
140 * switch will not work unless the controller explicitly lets this
141 * switch pass the traffic.
143 * - Between Switch and Gateway. This switch is between another
144 * switch and the gateway, and we want to allow the other switch's
145 * traffic through. This uses the same rules and logic as the
146 * "Between Switch and Controller" configuration described earlier.
148 * - Controller on Local VM. The controller is a guest VM on the
149 * system running in-band control. This uses rules (a), (b), (c),
152 * - Controller on Local VM with Different Networks. The controller
153 * is a guest VM on the system running in-band control, but the
154 * local port is not used to connect to the controller. For
155 * example, an IP address is configured on eth0 of the switch. The
156 * controller's VM is connected through eth1 of the switch, but an
157 * IP address has not been configured for that port on the switch.
158 * As such, the switch will use eth0 to connect to the controller,
159 * and eth1's rules about the local port will not work. In the
160 * example, the switch attached to eth0 would use rules (a), (b),
161 * (c), (h), and (i) on eth0. The switch attached to eth1 would use
162 * rules (f), (g), (h), and (i).
164 * The following are explicitly *not* supported by in-band control:
166 * - Specify Controller by Name. Currently, the controller must be
167 * identified by IP address. A naive approach would be to permit
168 * all DNS traffic. Unfortunately, this would prevent the
169 * controller from defining any policy over DNS. Since switches
170 * that are located behind us need to connect to the controller,
171 * in-band cannot simply add a rule that allows DNS traffic from
172 * the local port. The "correct" way to support this is to parse
173 * DNS requests to allow all traffic related to a request for the
174 * controller's name through. Due to the potential security
175 * problems and amount of processing, we decided to hold off for
178 * - Differing Controllers for Switches. All switches must know
179 * the L3 addresses for all the controllers that other switches
180 * may use, since rules need to be set up to allow traffic related
181 * to those controllers through. See rules (f), (g), (h), and (i).
183 * - Differing Routes for Switches. In order for the switch to
184 * allow other switches to connect to a controller through a
185 * gateway, it allows the gateway's traffic through with rules (d)
186 * and (e). If the routes to the controller differ for the two
187 * switches, we will not know the MAC address of the alternate
191 /* Priorities used in classifier for in-band rules. These values are higher
192 * than any that may be set with OpenFlow, and "18" kind of looks like "IB".
193 * The ordering of priorities is not important because all of the rules set up
194 * by in-band control have the same action. The only reason to use more than
195 * one priority is to make the kind of flow easier to see during debugging. */
197 IBR_FROM_LOCAL_DHCP
= 180000, /* (a) From local port, DHCP. */
198 IBR_TO_LOCAL_ARP
, /* (b) To local port, ARP. */
199 IBR_FROM_LOCAL_ARP
, /* (c) From local port, ARP. */
200 IBR_TO_REMOTE_ARP
, /* (d) To remote MAC, ARP. */
201 IBR_FROM_REMOTE_ARP
, /* (e) From remote MAC, ARP. */
202 IBR_TO_CTL_ARP
, /* (f) To controller IP, ARP. */
203 IBR_FROM_CTL_ARP
, /* (g) From controller IP, ARP. */
204 IBR_TO_CTL_OFP
, /* (h) To controller, OpenFlow port. */
205 IBR_FROM_CTL_OFP
/* (i) From controller, OpenFlow port. */
208 struct in_band_rule
{
211 unsigned int priority
;
214 /* Track one remote IP and next hop information. */
215 struct in_band_remote
{
216 struct rconn
*rconn
; /* Connection to remote. */
217 uint32_t remote_ip
; /* Remote IP, 0 if unknown. */
218 uint8_t remote_mac
[ETH_ADDR_LEN
]; /* Next-hop MAC, all-zeros if unknown. */
219 uint8_t last_remote_mac
[ETH_ADDR_LEN
]; /* Previous nonzero next-hop MAC. */
220 struct netdev
*remote_netdev
; /* Device to send to next-hop MAC. */
224 struct ofproto
*ofproto
;
225 struct status_category
*ss_cat
;
227 /* Remote information. */
228 time_t next_remote_refresh
; /* Refresh timer. */
229 struct in_band_remote
*remotes
;
232 /* Local information. */
233 time_t next_local_refresh
; /* Refresh timer. */
234 uint8_t local_mac
[ETH_ADDR_LEN
]; /* Current MAC. */
235 struct netdev
*local_netdev
; /* Local port's network device. */
237 /* Local and remote addresses that are installed as flows. */
238 uint8_t installed_local_mac
[ETH_ADDR_LEN
];
239 uint32_t *remote_ips
;
240 uint32_t n_remote_ips
;
241 uint8_t *remote_macs
;
242 size_t n_remote_macs
;
245 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(60, 60);
248 refresh_remote(struct in_band
*ib
, struct in_band_remote
*r
)
250 struct in_addr remote_inaddr
;
251 struct in_addr next_hop_inaddr
;
255 memset(r
->remote_mac
, 0, sizeof r
->remote_mac
);
257 /* Get remote IP address. */
258 r
->remote_ip
= rconn_get_remote_ip(r
->rconn
);
260 /* No remote IP address means that this rconn is probably either
261 * configured for a non-IP based protocol (e.g. "unix:") or
262 * misconfigured entirely. No point in refreshing quickly. */
266 /* Find the next-hop IP address. */
267 remote_inaddr
.s_addr
= r
->remote_ip
;
268 retval
= netdev_get_next_hop(ib
->local_netdev
, &remote_inaddr
,
269 &next_hop_inaddr
, &next_hop_dev
);
271 VLOG_WARN("cannot find route for controller ("IP_FMT
"): %s",
272 IP_ARGS(&r
->remote_ip
), strerror(retval
));
275 if (!next_hop_inaddr
.s_addr
) {
276 next_hop_inaddr
.s_addr
= remote_inaddr
.s_addr
;
279 /* Get the next-hop IP and network device. */
280 if (!r
->remote_netdev
281 || strcmp(netdev_get_name(r
->remote_netdev
), next_hop_dev
))
283 netdev_close(r
->remote_netdev
);
285 retval
= netdev_open_default(next_hop_dev
, &r
->remote_netdev
);
287 VLOG_WARN_RL(&rl
, "cannot open netdev %s (next hop "
288 "to controller "IP_FMT
"): %s",
289 next_hop_dev
, IP_ARGS(&r
->remote_ip
),
297 /* Look up the MAC address of the next-hop IP address. */
298 retval
= netdev_arp_lookup(r
->remote_netdev
, next_hop_inaddr
.s_addr
,
301 VLOG_DBG_RL(&rl
, "cannot look up remote MAC address ("IP_FMT
"): %s",
302 IP_ARGS(&next_hop_inaddr
.s_addr
), strerror(retval
));
305 /* If we don't have a MAC address, then refresh quickly, since we probably
306 * will get a MAC address soon (via ARP). Otherwise, we can afford to wait
308 return eth_addr_is_zero(r
->remote_mac
) ? 1 : 10;
312 refresh_remotes(struct in_band
*ib
)
314 struct in_band_remote
*r
;
317 if (time_now() < ib
->next_remote_refresh
) {
322 ib
->next_remote_refresh
= TIME_MAX
;
323 for (r
= ib
->remotes
; r
< &ib
->remotes
[ib
->n_remotes
]; r
++) {
324 uint8_t old_remote_mac
[ETH_ADDR_LEN
];
328 memcpy(old_remote_mac
, r
->remote_mac
, ETH_ADDR_LEN
);
330 /* Refresh remote information. */
331 next_refresh
= refresh_remote(ib
, r
) + time_now();
332 ib
->next_remote_refresh
= MIN(ib
->next_remote_refresh
, next_refresh
);
334 /* If the MAC changed, log the changes. */
335 if (!eth_addr_equals(r
->remote_mac
, old_remote_mac
)) {
337 if (!eth_addr_is_zero(r
->remote_mac
)
338 && !eth_addr_equals(r
->last_remote_mac
, r
->remote_mac
)) {
339 VLOG_DBG("remote MAC address changed from "ETH_ADDR_FMT
341 ETH_ADDR_ARGS(r
->last_remote_mac
),
342 ETH_ADDR_ARGS(r
->remote_mac
));
343 memcpy(r
->last_remote_mac
, r
->remote_mac
, ETH_ADDR_LEN
);
351 /* Refreshes the MAC address of the local port into ib->local_mac, if it is due
352 * for a refresh. Returns true if anything changed, otherwise false. */
354 refresh_local(struct in_band
*ib
)
356 uint8_t ea
[ETH_ADDR_LEN
];
360 if (now
< ib
->next_local_refresh
) {
363 ib
->next_local_refresh
= now
+ 1;
365 if (netdev_get_etheraddr(ib
->local_netdev
, ea
)
366 || eth_addr_equals(ea
, ib
->local_mac
)) {
370 memcpy(ib
->local_mac
, ea
, ETH_ADDR_LEN
);
375 in_band_status_cb(struct status_reply
*sr
, void *in_band_
)
377 struct in_band
*in_band
= in_band_
;
379 if (!eth_addr_is_zero(in_band
->local_mac
)) {
380 status_reply_put(sr
, "local-mac="ETH_ADDR_FMT
,
381 ETH_ADDR_ARGS(in_band
->local_mac
));
384 if (in_band
->n_remotes
385 && !eth_addr_is_zero(in_band
->remotes
[0].remote_mac
)) {
386 status_reply_put(sr
, "remote-mac="ETH_ADDR_FMT
,
387 ETH_ADDR_ARGS(in_band
->remotes
[0].remote_mac
));
391 /* Returns true if 'packet' should be sent to the local port regardless
392 * of the flow table. */
394 in_band_msg_in_hook(struct in_band
*in_band
, const flow_t
*flow
,
395 const struct ofpbuf
*packet
)
401 /* Regardless of how the flow table is configured, we want to be
402 * able to see replies to our DHCP requests. */
403 if (flow
->dl_type
== htons(ETH_TYPE_IP
)
404 && flow
->nw_proto
== IP_TYPE_UDP
405 && flow
->tp_src
== htons(DHCP_SERVER_PORT
)
406 && flow
->tp_dst
== htons(DHCP_CLIENT_PORT
)
408 struct dhcp_header
*dhcp
;
410 dhcp
= ofpbuf_at(packet
, (char *)packet
->l7
- (char *)packet
->data
,
416 refresh_local(in_band
);
417 if (!eth_addr_is_zero(in_band
->local_mac
)
418 && eth_addr_equals(dhcp
->chaddr
, in_band
->local_mac
)) {
426 /* Returns true if the rule that would match 'flow' with 'actions' is
427 * allowed to be set up in the datapath. */
429 in_band_rule_check(struct in_band
*in_band
, const flow_t
*flow
,
430 const struct odp_actions
*actions
)
436 /* Don't allow flows that would prevent DHCP replies from being seen
437 * by the local port. */
438 if (flow
->dl_type
== htons(ETH_TYPE_IP
)
439 && flow
->nw_proto
== IP_TYPE_UDP
440 && flow
->tp_src
== htons(DHCP_SERVER_PORT
)
441 && flow
->tp_dst
== htons(DHCP_CLIENT_PORT
)) {
444 for (i
=0; i
<actions
->n_actions
; i
++) {
445 if (actions
->actions
[i
].output
.type
== ODPAT_OUTPUT
446 && actions
->actions
[i
].output
.port
== ODPP_LOCAL
) {
457 init_rule(struct in_band_rule
*rule
, unsigned int priority
)
459 rule
->wildcards
= OVSFW_ALL
;
460 rule
->priority
= priority
;
462 /* Not strictly necessary but seems cleaner. */
463 memset(&rule
->flow
, 0, sizeof rule
->flow
);
467 set_in_port(struct in_band_rule
*rule
, uint16_t odp_port
)
469 rule
->wildcards
&= ~OFPFW_IN_PORT
;
470 rule
->flow
.in_port
= odp_port
;
474 set_dl_type(struct in_band_rule
*rule
, uint16_t dl_type
)
476 rule
->wildcards
&= ~OFPFW_DL_TYPE
;
477 rule
->flow
.dl_type
= htons(dl_type
);
481 set_dl_src(struct in_band_rule
*rule
, const uint8_t dl_src
[ETH_ADDR_LEN
])
483 rule
->wildcards
&= ~OFPFW_DL_SRC
;
484 memcpy(rule
->flow
.dl_src
, dl_src
, ETH_ADDR_LEN
);
488 set_dl_dst(struct in_band_rule
*rule
, const uint8_t dl_dst
[ETH_ADDR_LEN
])
490 rule
->wildcards
&= ~OFPFW_DL_DST
;
491 memcpy(rule
->flow
.dl_dst
, dl_dst
, ETH_ADDR_LEN
);
495 set_tp_src(struct in_band_rule
*rule
, uint16_t tp_src
)
497 rule
->wildcards
&= ~OFPFW_TP_SRC
;
498 rule
->flow
.tp_src
= htons(tp_src
);
502 set_tp_dst(struct in_band_rule
*rule
, uint16_t tp_dst
)
504 rule
->wildcards
&= ~OFPFW_TP_DST
;
505 rule
->flow
.tp_dst
= htons(tp_dst
);
509 set_nw_proto(struct in_band_rule
*rule
, uint8_t nw_proto
)
511 rule
->wildcards
&= ~OFPFW_NW_PROTO
;
512 rule
->flow
.nw_proto
= nw_proto
;
516 set_nw_src(struct in_band_rule
*rule
, uint32_t nw_src
)
518 rule
->wildcards
&= ~OFPFW_NW_SRC_MASK
;
519 rule
->flow
.nw_src
= nw_src
;
523 set_nw_dst(struct in_band_rule
*rule
, uint32_t nw_dst
)
525 rule
->wildcards
&= ~OFPFW_NW_DST_MASK
;
526 rule
->flow
.nw_dst
= nw_dst
;
530 make_rules(struct in_band
*ib
,
531 void (*cb
)(struct in_band
*, const struct in_band_rule
*))
533 struct in_band_rule rule
;
536 if (!eth_addr_is_zero(ib
->installed_local_mac
)) {
537 /* Allow DHCP requests to be sent from the local port. */
538 init_rule(&rule
, IBR_FROM_LOCAL_DHCP
);
539 set_in_port(&rule
, ODPP_LOCAL
);
540 set_dl_type(&rule
, ETH_TYPE_IP
);
541 set_dl_src(&rule
, ib
->installed_local_mac
);
542 set_nw_proto(&rule
, IP_TYPE_UDP
);
543 set_tp_src(&rule
, DHCP_CLIENT_PORT
);
544 set_tp_dst(&rule
, DHCP_SERVER_PORT
);
547 /* Allow the connection's interface to receive directed ARP traffic. */
548 init_rule(&rule
, IBR_TO_LOCAL_ARP
);
549 set_dl_type(&rule
, ETH_TYPE_ARP
);
550 set_dl_dst(&rule
, ib
->installed_local_mac
);
551 set_nw_proto(&rule
, ARP_OP_REPLY
);
554 /* Allow the connection's interface to be the source of ARP traffic. */
555 init_rule(&rule
, IBR_FROM_LOCAL_ARP
);
556 set_dl_type(&rule
, ETH_TYPE_ARP
);
557 set_dl_src(&rule
, ib
->installed_local_mac
);
558 set_nw_proto(&rule
, ARP_OP_REQUEST
);
562 for (i
= 0; i
< ib
->n_remote_macs
; i
++) {
563 const uint8_t *remote_mac
= &ib
->remote_macs
[i
* ETH_ADDR_LEN
];
566 const uint8_t *prev_mac
= &ib
->remote_macs
[(i
- 1) * ETH_ADDR_LEN
];
567 if (eth_addr_equals(remote_mac
, prev_mac
)) {
568 /* Skip duplicates. */
573 /* Allow ARP replies to the remote side's MAC. */
574 init_rule(&rule
, IBR_TO_REMOTE_ARP
);
575 set_dl_type(&rule
, ETH_TYPE_ARP
);
576 set_dl_dst(&rule
, remote_mac
);
577 set_nw_proto(&rule
, ARP_OP_REPLY
);
580 /* Allow ARP requests from the remote side's MAC. */
581 init_rule(&rule
, IBR_FROM_REMOTE_ARP
);
582 set_dl_type(&rule
, ETH_TYPE_ARP
);
583 set_dl_src(&rule
, remote_mac
);
584 set_nw_proto(&rule
, ARP_OP_REQUEST
);
588 for (i
= 0; i
< ib
->n_remote_ips
; i
++) {
589 uint32_t remote_ip
= ib
->remote_ips
[i
];
591 if (i
> 0 && ib
->remote_ips
[i
- 1] == remote_ip
) {
592 /* Skip duplicates. */
596 /* Allow ARP replies to the controller's IP. */
597 init_rule(&rule
, IBR_TO_CTL_ARP
);
598 set_dl_type(&rule
, ETH_TYPE_ARP
);
599 set_nw_proto(&rule
, ARP_OP_REPLY
);
600 set_nw_dst(&rule
, remote_ip
);
603 /* Allow ARP requests from the controller's IP. */
604 init_rule(&rule
, IBR_FROM_CTL_ARP
);
605 set_dl_type(&rule
, ETH_TYPE_ARP
);
606 set_nw_proto(&rule
, ARP_OP_REQUEST
);
607 set_nw_src(&rule
, remote_ip
);
610 /* OpenFlow traffic to the controller. */
611 init_rule(&rule
, IBR_TO_CTL_OFP
);
612 set_dl_type(&rule
, ETH_TYPE_IP
);
613 set_nw_proto(&rule
, IP_TYPE_TCP
);
614 set_nw_dst(&rule
, remote_ip
);
615 set_tp_dst(&rule
, OFP_TCP_PORT
);
618 /* OpenFlow traffic from the controller. */
619 init_rule(&rule
, IBR_FROM_CTL_OFP
);
620 set_dl_type(&rule
, ETH_TYPE_IP
);
621 set_nw_proto(&rule
, IP_TYPE_TCP
);
622 set_nw_src(&rule
, remote_ip
);
623 set_tp_src(&rule
, OFP_TCP_PORT
);
629 drop_rule(struct in_band
*ib
, const struct in_band_rule
*rule
)
631 ofproto_delete_flow(ib
->ofproto
, &rule
->flow
,
632 rule
->wildcards
, rule
->priority
);
635 /* Drops from the flow table all of the flows set up by 'ib', then clears out
636 * the information about the installed flows so that they can be filled in
637 * again if necessary. */
639 drop_rules(struct in_band
*ib
)
642 make_rules(ib
, drop_rule
);
644 /* Clear out state. */
645 memset(ib
->installed_local_mac
, 0, sizeof ib
->installed_local_mac
);
647 free(ib
->remote_ips
);
648 ib
->remote_ips
= NULL
;
649 ib
->n_remote_ips
= 0;
651 free(ib
->remote_macs
);
652 ib
->remote_macs
= NULL
;
653 ib
->n_remote_macs
= 0;
657 add_rule(struct in_band
*ib
, const struct in_band_rule
*rule
)
659 union ofp_action action
;
661 action
.type
= htons(OFPAT_OUTPUT
);
662 action
.output
.len
= htons(sizeof action
);
663 action
.output
.port
= htons(OFPP_NORMAL
);
664 action
.output
.max_len
= htons(0);
665 ofproto_add_flow(ib
->ofproto
, &rule
->flow
, rule
->wildcards
,
666 rule
->priority
, &action
, 1, 0);
669 /* Inserts flows into the flow table for the current state of 'ib'. */
671 add_rules(struct in_band
*ib
)
673 make_rules(ib
, add_rule
);
677 compare_ips(const void *a
, const void *b
)
679 return memcmp(a
, b
, sizeof(uint32_t));
683 compare_macs(const void *a
, const void *b
)
685 return memcmp(a
, b
, ETH_ADDR_LEN
);
689 in_band_run(struct in_band
*ib
)
691 struct in_band_remote
*r
;
692 bool local_change
, remote_change
;
694 local_change
= refresh_local(ib
);
695 remote_change
= refresh_remotes(ib
);
696 if (!local_change
&& !remote_change
) {
697 /* Nothing changed, nothing to do. */
701 /* Drop old rules. */
704 /* Figure out new rules. */
705 memcpy(ib
->installed_local_mac
, ib
->local_mac
, ETH_ADDR_LEN
);
706 ib
->remote_ips
= xmalloc(ib
->n_remotes
* sizeof *ib
->remote_ips
);
707 ib
->n_remote_ips
= 0;
708 ib
->remote_macs
= xmalloc(ib
->n_remotes
* ETH_ADDR_LEN
);
709 ib
->n_remote_macs
= 0;
710 for (r
= ib
->remotes
; r
< &ib
->remotes
[ib
->n_remotes
]; r
++) {
712 ib
->remote_ips
[ib
->n_remote_ips
++] = r
->remote_ip
;
714 if (!eth_addr_is_zero(r
->remote_mac
)) {
715 memcpy(&ib
->remote_macs
[ib
->n_remote_macs
* ETH_ADDR_LEN
],
716 r
->remote_mac
, ETH_ADDR_LEN
);
721 /* Sort, to allow make_rules() to easily skip duplicates. */
722 qsort(ib
->remote_ips
, ib
->n_remote_ips
, sizeof *ib
->remote_ips
,
724 qsort(ib
->remote_macs
, ib
->n_remote_macs
, ETH_ADDR_LEN
, compare_macs
);
731 in_band_wait(struct in_band
*in_band
)
733 time_t now
= time_now();
735 = MIN(in_band
->next_remote_refresh
, in_band
->next_local_refresh
);
737 poll_timer_wait((wakeup
- now
) * 1000);
739 poll_immediate_wake();
743 /* ofproto has flushed all flows from the flow table and it is calling us back
744 * to allow us to reinstall the ones that are important to us. */
746 in_band_flushed(struct in_band
*in_band
)
752 in_band_create(struct ofproto
*ofproto
, struct dpif
*dpif
,
753 struct switch_status
*ss
, struct in_band
**in_bandp
)
755 struct in_band
*in_band
;
756 char local_name
[IF_NAMESIZE
];
757 struct netdev
*local_netdev
;
760 error
= dpif_port_get_name(dpif
, ODPP_LOCAL
,
761 local_name
, sizeof local_name
);
763 VLOG_ERR("failed to initialize in-band control: cannot get name "
764 "of datapath local port (%s)", strerror(error
));
768 error
= netdev_open_default(local_name
, &local_netdev
);
770 VLOG_ERR("failed to initialize in-band control: cannot open "
771 "datapath local port %s (%s)", local_name
, strerror(error
));
775 in_band
= xzalloc(sizeof *in_band
);
776 in_band
->ofproto
= ofproto
;
777 in_band
->ss_cat
= switch_status_register(ss
, "in-band",
778 in_band_status_cb
, in_band
);
779 in_band
->next_remote_refresh
= TIME_MIN
;
780 in_band
->next_local_refresh
= TIME_MIN
;
781 in_band
->local_netdev
= local_netdev
;
789 in_band_destroy(struct in_band
*ib
)
793 in_band_set_remotes(ib
, NULL
, 0);
794 switch_status_unregister(ib
->ss_cat
);
795 netdev_close(ib
->local_netdev
);
801 in_band_set_remotes(struct in_band
*ib
, struct rconn
**remotes
, size_t n
)
805 /* Optimize the case where the rconns are the same as last time. */
806 if (n
== ib
->n_remotes
) {
807 for (i
= 0; i
< n
; i
++) {
808 if (ib
->remotes
[i
].rconn
!= remotes
[i
]) {
817 for (i
= 0; i
< ib
->n_remotes
; i
++) {
818 /* We don't own the rconn. */
819 netdev_close(ib
->remotes
[i
].remote_netdev
);
823 ib
->next_remote_refresh
= TIME_MIN
;
824 ib
->remotes
= n
? xzalloc(n
* sizeof *ib
->remotes
) : 0;
826 for (i
= 0; i
< n
; i
++) {
827 ib
->remotes
[i
].rconn
= remotes
[i
];