2 * Copyright (c) 2008, 2009 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>
26 #include "mac-learning.h"
29 #include "ofp-print.h"
32 #include "openflow/openflow.h"
34 #include "poll-loop.h"
40 #define THIS_MODULE VLM_in_band
43 #define IB_BASE_PRIORITY 18181800
46 IBR_FROM_LOCAL_PORT, /* Sent by secure channel. */
47 IBR_TO_LOCAL_PORT, /* Sent to secure channel. */
48 IBR_ARP_FROM_CTL, /* ARP from the controller. */
49 IBR_TO_CTL_OFP_SRC, /* To controller, OpenFlow source port. */
50 IBR_TO_CTL_OFP_DST, /* To controller, OpenFlow dest port. */
51 IBR_FROM_CTL_OFP_SRC, /* From controller, OpenFlow source port. */
52 IBR_FROM_CTL_OFP_DST, /* From controller, OpenFlow dest port. */
53 #if OFP_TCP_PORT != OFP_SSL_PORT
54 #error Need to support separate TCP and SSL flows.
63 unsigned int priority;
67 struct ofproto *ofproto;
68 struct netdev *netdev;
69 struct rconn *controller;
70 struct status_category *ss_cat;
72 /* Keeping track of controller's MAC address. */
73 uint32_t ip; /* Current IP, 0 if unknown. */
74 uint32_t last_ip; /* Last known IP, 0 if never known. */
75 uint8_t mac[ETH_ADDR_LEN]; /* Current MAC, 0 if unknown. */
76 uint8_t last_mac[ETH_ADDR_LEN]; /* Last known MAC, 0 if never known */
77 time_t next_refresh; /* Next time to refresh MAC address. */
79 /* Keeping track of the local port's MAC address. */
80 uint8_t local_mac[ETH_ADDR_LEN]; /* Current MAC. */
81 time_t next_local_refresh; /* Next time to refresh MAC address. */
83 /* Rules that we set up. */
84 struct ib_rule rules[N_IB_RULES];
87 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(60, 60);
89 static const uint8_t *
90 get_controller_mac(struct in_band *ib)
92 time_t now = time_now();
95 ip = rconn_get_ip(ib->controller);
96 if (ip != ib->ip || now >= ib->next_refresh) {
101 /* Look up MAC address. */
102 memset(ib->mac, 0, sizeof ib->mac);
104 int retval = netdev_arp_lookup(ib->netdev, ib->ip, ib->mac);
106 VLOG_DBG_RL(&rl, "cannot look up controller hw address "
108 IP_ARGS(&ib->ip), strerror(retval));
111 have_mac = !eth_addr_is_zero(ib->mac);
113 /* Log changes in IP, MAC addresses. */
114 if (ib->ip && ib->ip != ib->last_ip) {
115 VLOG_DBG("controller IP address changed from "IP_FMT
116 " to "IP_FMT, IP_ARGS(&ib->last_ip), IP_ARGS(&ib->ip));
117 ib->last_ip = ib->ip;
119 if (have_mac && memcmp(ib->last_mac, ib->mac, ETH_ADDR_LEN)) {
120 VLOG_DBG("controller MAC address changed from "ETH_ADDR_FMT" to "
122 ETH_ADDR_ARGS(ib->last_mac), ETH_ADDR_ARGS(ib->mac));
123 memcpy(ib->last_mac, ib->mac, ETH_ADDR_LEN);
126 /* Schedule next refresh.
128 * If we have an IP address but not a MAC address, then refresh
129 * quickly, since we probably will get a MAC address soon (via ARP).
130 * Otherwise, we can afford to wait a little while. */
131 ib->next_refresh = now + (!ib->ip || have_mac ? 10 : 1);
133 return !eth_addr_is_zero(ib->mac) ? ib->mac : NULL;
136 static const uint8_t *
137 get_local_mac(struct in_band *ib)
139 time_t now = time_now();
140 if (now >= ib->next_local_refresh) {
141 uint8_t ea[ETH_ADDR_LEN];
142 if (!netdev_nodev_get_etheraddr(netdev_get_name(ib->netdev), ea)) {
143 memcpy(ib->local_mac, ea, ETH_ADDR_LEN);
145 ib->next_local_refresh = now + 1;
147 return !eth_addr_is_zero(ib->local_mac) ? ib->local_mac : NULL;
151 in_band_status_cb(struct status_reply *sr, void *in_band_)
153 struct in_band *in_band = in_band_;
154 struct in_addr local_ip;
155 const uint8_t *local_mac;
156 uint32_t controller_ip;
157 const uint8_t *controller_mac;
159 if (netdev_get_in4(in_band->netdev, &local_ip)) {
160 status_reply_put(sr, "local-ip="IP_FMT, IP_ARGS(&local_ip.s_addr));
162 local_mac = get_local_mac(in_band);
164 status_reply_put(sr, "local-mac="ETH_ADDR_FMT,
165 ETH_ADDR_ARGS(local_mac));
168 controller_ip = rconn_get_ip(in_band->controller);
170 status_reply_put(sr, "controller-ip="IP_FMT,
171 IP_ARGS(&controller_ip));
173 controller_mac = get_controller_mac(in_band);
174 if (controller_mac) {
175 status_reply_put(sr, "controller-mac="ETH_ADDR_FMT,
176 ETH_ADDR_ARGS(controller_mac));
181 drop_flow(struct in_band *in_band, int rule_idx)
183 struct ib_rule *rule = &in_band->rules[rule_idx];
185 if (rule->installed) {
186 rule->installed = false;
187 ofproto_delete_flow(in_band->ofproto, &rule->flow, rule->wildcards,
192 /* out_port and fixed_fields are assumed never to change. */
194 setup_flow(struct in_band *in_band, int rule_idx, const flow_t *flow,
195 uint32_t fixed_fields, uint16_t out_port)
197 struct ib_rule *rule = &in_band->rules[rule_idx];
199 if (!rule->installed || memcmp(flow, &rule->flow, sizeof *flow)) {
200 union ofp_action action;
202 drop_flow(in_band, rule_idx);
204 rule->installed = true;
206 rule->wildcards = OFPFW_ALL & ~fixed_fields;
207 rule->priority = IB_BASE_PRIORITY + (N_IB_RULES - rule_idx);
209 action.type = htons(OFPAT_OUTPUT);
210 action.output.len = htons(sizeof action);
211 action.output.port = htons(out_port);
212 action.output.max_len = htons(0);
213 ofproto_add_flow(in_band->ofproto, &rule->flow, rule->wildcards,
214 rule->priority, &action, 1, 0);
219 in_band_run(struct in_band *in_band)
221 const uint8_t *controller_mac;
222 const uint8_t *local_mac;
225 if (time_now() < MIN(in_band->next_refresh, in_band->next_local_refresh)) {
228 controller_mac = get_controller_mac(in_band);
229 local_mac = get_local_mac(in_band);
231 /* Switch traffic sent by the secure channel. */
232 memset(&flow, 0, sizeof flow);
233 flow.in_port = ODPP_LOCAL;
234 setup_flow(in_band, IBR_FROM_LOCAL_PORT, &flow, OFPFW_IN_PORT,
237 /* Deliver traffic sent to the secure channel to the local port. */
239 memset(&flow, 0, sizeof flow);
240 memcpy(flow.dl_dst, local_mac, ETH_ADDR_LEN);
241 setup_flow(in_band, IBR_TO_LOCAL_PORT, &flow, OFPFW_DL_DST,
244 drop_flow(in_band, IBR_TO_LOCAL_PORT);
247 if (controller_mac) {
248 /* Switch ARP requests sent by the controller. (OFPP_NORMAL will "do
249 * the right thing" regarding VLANs here.) */
250 memset(&flow, 0, sizeof flow);
251 flow.dl_type = htons(ETH_TYPE_ARP);
252 memcpy(flow.dl_dst, eth_addr_broadcast, ETH_ADDR_LEN);
253 memcpy(flow.dl_src, controller_mac, ETH_ADDR_LEN);
254 setup_flow(in_band, IBR_ARP_FROM_CTL, &flow,
255 OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_DL_SRC,
258 /* OpenFlow traffic to or from the controller.
260 * (A given field's value is completely ignored if it is wildcarded,
261 * which is why we can get away with using a single 'flow' in each
263 memset(&flow, 0, sizeof flow);
264 flow.dl_type = htons(ETH_TYPE_IP);
265 memcpy(flow.dl_src, controller_mac, ETH_ADDR_LEN);
266 memcpy(flow.dl_dst, controller_mac, ETH_ADDR_LEN);
267 flow.nw_proto = IP_TYPE_TCP;
268 flow.tp_src = htons(OFP_TCP_PORT);
269 flow.tp_dst = htons(OFP_TCP_PORT);
270 setup_flow(in_band, IBR_TO_CTL_OFP_SRC, &flow,
271 (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO
272 | OFPFW_TP_SRC), OFPP_NORMAL);
273 setup_flow(in_band, IBR_TO_CTL_OFP_DST, &flow,
274 (OFPFW_DL_TYPE | OFPFW_DL_DST | OFPFW_NW_PROTO
275 | OFPFW_TP_DST), OFPP_NORMAL);
276 setup_flow(in_band, IBR_FROM_CTL_OFP_SRC, &flow,
277 (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO
278 | OFPFW_TP_SRC), OFPP_NORMAL);
279 setup_flow(in_band, IBR_FROM_CTL_OFP_DST, &flow,
280 (OFPFW_DL_TYPE | OFPFW_DL_SRC | OFPFW_NW_PROTO
281 | OFPFW_TP_DST), OFPP_NORMAL);
283 drop_flow(in_band, IBR_ARP_FROM_CTL);
284 drop_flow(in_band, IBR_TO_CTL_OFP_DST);
285 drop_flow(in_band, IBR_TO_CTL_OFP_SRC);
286 drop_flow(in_band, IBR_FROM_CTL_OFP_DST);
287 drop_flow(in_band, IBR_FROM_CTL_OFP_SRC);
292 in_band_wait(struct in_band *in_band)
294 time_t now = time_now();
295 time_t wakeup = MIN(in_band->next_refresh, in_band->next_local_refresh);
297 poll_timer_wait((wakeup - now) * 1000);
299 poll_immediate_wake();
304 in_band_flushed(struct in_band *in_band)
308 for (i = 0; i < N_IB_RULES; i++) {
309 in_band->rules[i].installed = false;
314 in_band_create(struct ofproto *ofproto,
315 struct dpif *dpif, struct switch_status *ss,
316 struct rconn *controller, struct in_band **in_bandp)
318 struct in_band *in_band;
319 struct netdev *netdev;
320 char local_name[IF_NAMESIZE];
324 error = dpif_port_get_name(dpif, ODPP_LOCAL,
325 local_name, sizeof local_name);
330 error = netdev_open(local_name, NETDEV_ETH_TYPE_NONE, &netdev);
332 VLOG_ERR("failed to open %s network device: %s",
333 local_name, strerror(error));
337 in_band = xcalloc(1, sizeof *in_band);
338 in_band->ofproto = ofproto;
339 in_band->netdev = netdev;
340 in_band->controller = controller;
341 in_band->ss_cat = switch_status_register(ss, "in-band",
342 in_band_status_cb, in_band);
343 in_band->next_refresh = TIME_MIN;
344 in_band->next_local_refresh = TIME_MIN;
351 in_band_destroy(struct in_band *in_band)
354 netdev_close(in_band->netdev);
355 switch_status_unregister(in_band->ss_cat);
356 /* We don't own the rconn. */