1 /* Copyright (c) 2013 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License. */
20 #include "ofproto/ofproto-provider.h"
21 #include "byte-order.h"
22 #include "dynamic-string.h"
25 #include "netdev-vport.h"
29 #include "socket-util.h"
35 * Disallow netdevs with names like "gre64_system" to prevent collisions. */
37 VLOG_DEFINE_THIS_MODULE(tunnel);
49 struct hmap_node match_node;
51 const struct ofport *ofport;
52 unsigned int netdev_seq;
53 struct tnl_match match;
56 static struct hmap tnl_match_map = HMAP_INITIALIZER(&tnl_match_map);
58 /* Returned to callers when their ofport will never be used to receive or send
59 * tunnel traffic. Alternatively, we could ask the caller to delete their
60 * ofport, but this would be unclean in the reconfguration case. For the first
61 * time, an ofproto provider would have to call ofproto_port_del() on itself.*/
62 static struct tnl_port void_tnl_port;
64 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
65 static struct vlog_rate_limit dbg_rl = VLOG_RATE_LIMIT_INIT(60, 60);
67 static struct tnl_port *tnl_find(struct tnl_match *);
68 static struct tnl_port *tnl_find_exact(struct tnl_match *);
69 static uint32_t tnl_hash(struct tnl_match *);
70 static void tnl_match_fmt(const struct tnl_match *, struct ds *);
71 static char *tnl_port_fmt(const struct tnl_port *);
72 static void tnl_port_mod_log(const struct tnl_port *, const char *action);
73 static const char *tnl_port_get_name(const struct tnl_port *);
75 static struct tnl_port *
76 tnl_port_add__(const struct ofport *ofport, uint32_t odp_port,
79 const struct netdev_tunnel_config *cfg;
80 struct tnl_port *existing_port;
81 struct tnl_port *tnl_port;
83 cfg = netdev_get_tunnel_config(ofport->netdev);
86 tnl_port = xzalloc(sizeof *tnl_port);
87 tnl_port->ofport = ofport;
88 tnl_port->netdev_seq = netdev_change_seq(tnl_port->ofport->netdev);
90 tnl_port->match.in_key = cfg->in_key;
91 tnl_port->match.ip_src = cfg->ip_src;
92 tnl_port->match.ip_dst = cfg->ip_dst;
93 tnl_port->match.skb_mark = cfg->ipsec ? IPSEC_MARK : 0;
94 tnl_port->match.in_key_flow = cfg->in_key_flow;
95 tnl_port->match.odp_port = odp_port;
97 existing_port = tnl_find_exact(&tnl_port->match);
100 struct ds ds = DS_EMPTY_INITIALIZER;
101 tnl_match_fmt(&tnl_port->match, &ds);
102 VLOG_WARN("%s: attempting to add tunnel port with same config as "
103 "port '%s' (%s)", tnl_port_get_name(tnl_port),
104 tnl_port_get_name(existing_port), ds_cstr(&ds));
108 return &void_tnl_port;
111 hmap_insert(&tnl_match_map, &tnl_port->match_node,
112 tnl_hash(&tnl_port->match));
113 tnl_port_mod_log(tnl_port, "adding");
117 /* Adds 'ofport' to the module with datapath port number 'odp_port'. 'ofport's
118 * must be added before they can be used by the module. 'ofport' must be a
121 tnl_port_add(const struct ofport *ofport, uint32_t odp_port)
123 return tnl_port_add__(ofport, odp_port, true);
126 /* Checks if the tnl_port pointed to by 'tnl_portp' needs reconfiguration due
127 * to changes in its netdev_tunnel_config. If it does, updates 'tnl_portp' to
128 * point to a new tnl_port and returns true. Otherwise, returns false.
129 * 'ofport' and 'odp_port' should be the same as would be passed to
132 tnl_port_reconfigure(const struct ofport *ofport, uint32_t odp_port,
133 struct tnl_port **tnl_portp)
135 struct tnl_port *tnl_port = *tnl_portp;
137 if (tnl_port == &void_tnl_port) {
138 *tnl_portp = tnl_port_add__(ofport, odp_port, false);
139 return *tnl_portp != &void_tnl_port;
140 } else if (tnl_port->ofport != ofport
141 || tnl_port->match.odp_port != odp_port
142 || tnl_port->netdev_seq != netdev_change_seq(ofport->netdev)) {
143 VLOG_DBG("reconfiguring %s", tnl_port_get_name(tnl_port));
144 tnl_port_del(tnl_port);
145 *tnl_portp = tnl_port_add(ofport, odp_port);
151 /* Removes 'tnl_port' from the module. */
153 tnl_port_del(struct tnl_port *tnl_port)
155 if (tnl_port && tnl_port != &void_tnl_port) {
156 tnl_port_mod_log(tnl_port, "removing");
157 hmap_remove(&tnl_match_map, &tnl_port->match_node);
162 /* Looks in the table of tunnels for a tunnel matching the metadata in 'flow'.
163 * Returns the 'ofport' corresponding to the new in_port, or a null pointer if
166 * Callers should verify that 'flow' needs to be received by calling
167 * tnl_port_should_receive() before this function. */
168 const struct ofport *
169 tnl_port_receive(const struct flow *flow)
171 char *pre_flow_str = NULL;
172 struct tnl_port *tnl_port;
173 struct tnl_match match;
175 memset(&match, 0, sizeof match);
176 match.odp_port = flow->in_port;
177 match.ip_src = flow->tunnel.ip_dst;
178 match.ip_dst = flow->tunnel.ip_src;
179 match.in_key = flow->tunnel.tun_id;
180 match.skb_mark = flow->skb_mark;
182 tnl_port = tnl_find(&match);
184 struct ds ds = DS_EMPTY_INITIALIZER;
186 tnl_match_fmt(&match, &ds);
187 VLOG_WARN_RL(&rl, "receive tunnel port not found (%s)", ds_cstr(&ds));
192 if (!VLOG_DROP_DBG(&dbg_rl)) {
193 pre_flow_str = flow_to_string(flow);
197 char *post_flow_str = flow_to_string(flow);
198 char *tnl_str = tnl_port_fmt(tnl_port);
199 VLOG_DBG("flow received\n"
203 tnl_str, pre_flow_str, post_flow_str);
208 return tnl_port->ofport;
211 /* Given that 'flow' should be output to the ofport corresponding to
212 * 'tnl_port', updates 'flow''s tunnel headers and returns the actual datapath
213 * port that the output should happen on. May return OVSP_NONE if the output
214 * shouldn't occur. */
216 tnl_port_send(const struct tnl_port *tnl_port, struct flow *flow)
218 const struct netdev_tunnel_config *cfg;
219 char *pre_flow_str = NULL;
221 if (tnl_port == &void_tnl_port) {
225 cfg = netdev_get_tunnel_config(tnl_port->ofport->netdev);
228 if (!VLOG_DROP_DBG(&dbg_rl)) {
229 pre_flow_str = flow_to_string(flow);
232 flow->tunnel.ip_src = tnl_port->match.ip_src;
233 flow->tunnel.ip_dst = tnl_port->match.ip_dst;
234 flow->skb_mark = tnl_port->match.skb_mark;
236 if (!cfg->out_key_flow) {
237 flow->tunnel.tun_id = cfg->out_key;
240 if (cfg->ttl_inherit && is_ip_any(flow)) {
241 flow->tunnel.ip_ttl = flow->nw_ttl;
243 flow->tunnel.ip_ttl = cfg->ttl;
246 if (cfg->tos_inherit && is_ip_any(flow)) {
247 flow->tunnel.ip_tos = flow->nw_tos & IP_DSCP_MASK;
249 flow->tunnel.ip_tos = cfg->tos;
252 if ((flow->nw_tos & IP_ECN_MASK) == IP_ECN_CE) {
253 flow->tunnel.ip_tos |= IP_ECN_ECT_0;
255 flow->tunnel.ip_tos |= flow->nw_tos & IP_ECN_MASK;
258 flow->tunnel.flags = (cfg->dont_fragment ? FLOW_TNL_F_DONT_FRAGMENT : 0)
259 | (cfg->csum ? FLOW_TNL_F_CSUM : 0)
260 | (cfg->out_key_present ? FLOW_TNL_F_KEY : 0);
263 char *post_flow_str = flow_to_string(flow);
264 char *tnl_str = tnl_port_fmt(tnl_port);
265 VLOG_DBG("flow sent\n"
269 tnl_str, pre_flow_str, post_flow_str);
275 return tnl_port->match.odp_port;
279 tnl_hash(struct tnl_match *match)
281 BUILD_ASSERT_DECL(sizeof *match % sizeof(uint32_t) == 0);
282 return hash_words((uint32_t *) match, sizeof *match / sizeof(uint32_t), 0);
285 static struct tnl_port *
286 tnl_find_exact(struct tnl_match *match)
288 struct tnl_port *tnl_port;
290 HMAP_FOR_EACH_WITH_HASH (tnl_port, match_node, tnl_hash(match),
292 if (!memcmp(match, &tnl_port->match, sizeof *match)) {
299 static struct tnl_port *
300 tnl_find(struct tnl_match *match_)
302 struct tnl_match match = *match_;
303 struct tnl_port *tnl_port;
305 /* remote_ip, local_ip, in_key */
306 tnl_port = tnl_find_exact(&match);
311 /* remote_ip, in_key */
313 tnl_port = tnl_find_exact(&match);
317 match.ip_src = match_->ip_src;
319 /* remote_ip, local_ip */
321 match.in_key_flow = true;
322 tnl_port = tnl_find_exact(&match);
329 tnl_port = tnl_find_exact(&match);
338 tnl_match_fmt(const struct tnl_match *match, struct ds *ds)
340 ds_put_format(ds, IP_FMT"->"IP_FMT, IP_ARGS(match->ip_src),
341 IP_ARGS(match->ip_dst));
343 if (match->in_key_flow) {
344 ds_put_cstr(ds, ", key=flow");
346 ds_put_format(ds, ", key=%#"PRIx64, ntohll(match->in_key));
349 ds_put_format(ds, ", dp port=%"PRIu32, match->odp_port);
350 ds_put_format(ds, ", skb mark=%"PRIu32, match->skb_mark);
354 tnl_port_mod_log(const struct tnl_port *tnl_port, const char *action)
356 if (VLOG_IS_DBG_ENABLED()) {
357 struct ds ds = DS_EMPTY_INITIALIZER;
359 tnl_match_fmt(&tnl_port->match, &ds);
360 VLOG_INFO("%s tunnel port %s (%s)", action,
361 tnl_port_get_name(tnl_port), ds_cstr(&ds));
367 tnl_port_fmt(const struct tnl_port *tnl_port)
369 const struct netdev_tunnel_config *cfg =
370 netdev_get_tunnel_config(tnl_port->ofport->netdev);
371 struct ds ds = DS_EMPTY_INITIALIZER;
373 ds_put_format(&ds, "port %"PRIu32": %s (%s: ", tnl_port->match.odp_port,
374 tnl_port_get_name(tnl_port),
375 netdev_get_type(tnl_port->ofport->netdev));
376 tnl_match_fmt(&tnl_port->match, &ds);
378 if (cfg->out_key != cfg->in_key ||
379 cfg->out_key_present != cfg->in_key_present ||
380 cfg->out_key_flow != cfg->in_key_flow) {
381 ds_put_cstr(&ds, ", out_key=");
382 if (!cfg->out_key_present) {
383 ds_put_cstr(&ds, "none");
384 } else if (cfg->out_key_flow) {
385 ds_put_cstr(&ds, "flow");
387 ds_put_format(&ds, "%#"PRIx64, ntohll(cfg->out_key));
391 if (cfg->ttl_inherit) {
392 ds_put_cstr(&ds, ", ttl=inherit");
394 ds_put_format(&ds, ", ttl=%"PRIu8, cfg->ttl);
397 if (cfg->tos_inherit) {
398 ds_put_cstr(&ds, ", tos=inherit");
399 } else if (cfg->tos) {
400 ds_put_format(&ds, ", tos=%#"PRIx8, cfg->tos);
403 if (!cfg->dont_fragment) {
404 ds_put_cstr(&ds, ", df=false");
408 ds_put_cstr(&ds, ", csum=true");
411 ds_put_cstr(&ds, ")\n");
413 return ds_steal_cstr(&ds);
417 tnl_port_get_name(const struct tnl_port *tnl_port)
419 return netdev_get_name(tnl_port->ofport->netdev);