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Extend OVS IPFIX exporter to export tunnel headers
[ovs.git] / ofproto / tunnel.c
1 /* Copyright (c) 2013, 2014 Nicira, Inc.
2 *
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:
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
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. */
14
15 #include <config.h>
16 #include "tunnel.h"
17
18 #include <errno.h>
19
20 #include "byte-order.h"
21 #include "connectivity.h"
22 #include "dynamic-string.h"
23 #include "hash.h"
24 #include "hmap.h"
25 #include "netdev.h"
26 #include "odp-util.h"
27 #include "packets.h"
28 #include "seq.h"
29 #include "smap.h"
30 #include "socket-util.h"
31 #include "tunnel.h"
32 #include "vlog.h"
33
34 VLOG_DEFINE_THIS_MODULE(tunnel);
35
36 /* skb mark used for IPsec tunnel packets */
37 #define IPSEC_MARK 1
38
39 struct tnl_match {
40 ovs_be64 in_key;
41 ovs_be32 ip_src;
42 ovs_be32 ip_dst;
43 odp_port_t odp_port;
44 uint32_t pkt_mark;
45 bool in_key_flow;
46 bool ip_src_flow;
47 bool ip_dst_flow;
48 };
49
50 struct tnl_port {
51 struct hmap_node ofport_node;
52 struct hmap_node match_node;
53
54 const struct ofport_dpif *ofport;
55 unsigned int change_seq;
56 struct netdev *netdev;
57
58 struct tnl_match match;
59 };
60
61 static struct ovs_rwlock rwlock = OVS_RWLOCK_INITIALIZER;
62
63 /* Tunnel matches.
64 *
65 * This module maps packets received over tunnel protocols to vports. The
66 * tunnel protocol and, for some protocols, tunnel-specific information (e.g.,
67 * for VXLAN, the UDP destination port number) are always use as part of the
68 * mapping. Which other fields are used for the mapping depends on the vports
69 * themselves (the parenthesized notations refer to "struct tnl_match" fields):
70 *
71 * - in_key: A vport may match a specific tunnel ID (in_key_flow == false)
72 * or arrange for the tunnel ID to be matched as tunnel.tun_id in the
73 * OpenFlow flow (in_key_flow == true).
74 *
75 * - ip_dst: A vport may match a specific destination IP address
76 * (ip_dst_flow == false) or arrange for the destination IP to be matched
77 * as tunnel.ip_dst in the OpenFlow flow (ip_dst_flow == true).
78 *
79 * - ip_src: A vport may match a specific IP source address (ip_src_flow ==
80 * false, ip_src != 0), wildcard all source addresses (ip_src_flow ==
81 * false, ip_src == 0), or arrange for the IP source address to be
82 * handled in the OpenFlow flow table (ip_src_flow == true).
83 *
84 * Thus, there are 2 * 2 * 3 == 12 possible ways a vport can match against a
85 * tunnel packet. We number the possibilities for each field in increasing
86 * order as listed in each bullet above. We order the 12 overall combinations
87 * in lexicographic order considering in_key first, then ip_dst, then
88 * ip_src. */
89 #define N_MATCH_TYPES (2 * 2 * 3)
90
91 /* The three possibilities (see above) for vport ip_src matches. */
92 enum ip_src_type {
93 IP_SRC_CFG, /* ip_src must equal configured address. */
94 IP_SRC_ANY, /* Any ip_src is acceptable. */
95 IP_SRC_FLOW /* ip_src is handled in flow table. */
96 };
97
98 /* Each hmap contains "struct tnl_port"s.
99 * The index is a combination of how each of the fields listed under "Tunnel
100 * matches" above matches, see the final paragraph for ordering. */
101 static struct hmap *tnl_match_maps[N_MATCH_TYPES] OVS_GUARDED_BY(rwlock);
102 static struct hmap **tnl_match_map(const struct tnl_match *);
103
104 static struct hmap ofport_map__ = HMAP_INITIALIZER(&ofport_map__);
105 static struct hmap *ofport_map OVS_GUARDED_BY(rwlock) = &ofport_map__;
106
107 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
108 static struct vlog_rate_limit dbg_rl = VLOG_RATE_LIMIT_INIT(60, 60);
109
110 static struct tnl_port *tnl_find(const struct flow *) OVS_REQ_RDLOCK(rwlock);
111 static struct tnl_port *tnl_find_exact(struct tnl_match *, struct hmap *)
112 OVS_REQ_RDLOCK(rwlock);
113 static struct tnl_port *tnl_find_ofport(const struct ofport_dpif *)
114 OVS_REQ_RDLOCK(rwlock);
115
116 static uint32_t tnl_hash(struct tnl_match *);
117 static void tnl_match_fmt(const struct tnl_match *, struct ds *);
118 static char *tnl_port_fmt(const struct tnl_port *) OVS_REQ_RDLOCK(rwlock);
119 static void tnl_port_mod_log(const struct tnl_port *, const char *action)
120 OVS_REQ_RDLOCK(rwlock);
121 static const char *tnl_port_get_name(const struct tnl_port *)
122 OVS_REQ_RDLOCK(rwlock);
123 static void tnl_port_del__(const struct ofport_dpif *) OVS_REQ_WRLOCK(rwlock);
124
125 static bool
126 tnl_port_add__(const struct ofport_dpif *ofport, const struct netdev *netdev,
127 odp_port_t odp_port, bool warn)
128 OVS_REQ_WRLOCK(rwlock)
129 {
130 const struct netdev_tunnel_config *cfg;
131 struct tnl_port *existing_port;
132 struct tnl_port *tnl_port;
133 struct hmap **map;
134
135 cfg = netdev_get_tunnel_config(netdev);
136 ovs_assert(cfg);
137
138 tnl_port = xzalloc(sizeof *tnl_port);
139 tnl_port->ofport = ofport;
140 tnl_port->netdev = netdev_ref(netdev);
141 tnl_port->change_seq = seq_read(connectivity_seq_get());
142
143 tnl_port->match.in_key = cfg->in_key;
144 tnl_port->match.ip_src = cfg->ip_src;
145 tnl_port->match.ip_dst = cfg->ip_dst;
146 tnl_port->match.ip_src_flow = cfg->ip_src_flow;
147 tnl_port->match.ip_dst_flow = cfg->ip_dst_flow;
148 tnl_port->match.pkt_mark = cfg->ipsec ? IPSEC_MARK : 0;
149 tnl_port->match.in_key_flow = cfg->in_key_flow;
150 tnl_port->match.odp_port = odp_port;
151
152 map = tnl_match_map(&tnl_port->match);
153 existing_port = tnl_find_exact(&tnl_port->match, *map);
154 if (existing_port) {
155 if (warn) {
156 struct ds ds = DS_EMPTY_INITIALIZER;
157 tnl_match_fmt(&tnl_port->match, &ds);
158 VLOG_WARN("%s: attempting to add tunnel port with same config as "
159 "port '%s' (%s)", tnl_port_get_name(tnl_port),
160 tnl_port_get_name(existing_port), ds_cstr(&ds));
161 ds_destroy(&ds);
162 }
163 netdev_close(tnl_port->netdev);
164 free(tnl_port);
165 return false;
166 }
167
168 hmap_insert(ofport_map, &tnl_port->ofport_node, hash_pointer(ofport, 0));
169
170 if (!*map) {
171 *map = xmalloc(sizeof **map);
172 hmap_init(*map);
173 }
174 hmap_insert(*map, &tnl_port->match_node, tnl_hash(&tnl_port->match));
175 tnl_port_mod_log(tnl_port, "adding");
176 return true;
177 }
178
179 /* Adds 'ofport' to the module with datapath port number 'odp_port'. 'ofport's
180 * must be added before they can be used by the module. 'ofport' must be a
181 * tunnel. */
182 void
183 tnl_port_add(const struct ofport_dpif *ofport, const struct netdev *netdev,
184 odp_port_t odp_port) OVS_EXCLUDED(rwlock)
185 {
186 ovs_rwlock_wrlock(&rwlock);
187 tnl_port_add__(ofport, netdev, odp_port, true);
188 ovs_rwlock_unlock(&rwlock);
189 }
190
191 /* Checks if the tunnel represented by 'ofport' reconfiguration due to changes
192 * in its netdev_tunnel_config. If it does, returns true. Otherwise, returns
193 * false. 'ofport' and 'odp_port' should be the same as would be passed to
194 * tnl_port_add(). */
195 bool
196 tnl_port_reconfigure(const struct ofport_dpif *ofport,
197 const struct netdev *netdev, odp_port_t odp_port)
198 OVS_EXCLUDED(rwlock)
199 {
200 struct tnl_port *tnl_port;
201 bool changed = false;
202
203 ovs_rwlock_wrlock(&rwlock);
204 tnl_port = tnl_find_ofport(ofport);
205 if (!tnl_port) {
206 changed = tnl_port_add__(ofport, netdev, odp_port, false);
207 } else if (tnl_port->netdev != netdev
208 || tnl_port->match.odp_port != odp_port
209 || tnl_port->change_seq != seq_read(connectivity_seq_get())) {
210 VLOG_DBG("reconfiguring %s", tnl_port_get_name(tnl_port));
211 tnl_port_del__(ofport);
212 tnl_port_add__(ofport, netdev, odp_port, true);
213 changed = true;
214 }
215 ovs_rwlock_unlock(&rwlock);
216 return changed;
217 }
218
219 static void
220 tnl_port_del__(const struct ofport_dpif *ofport) OVS_REQ_WRLOCK(rwlock)
221 {
222 struct tnl_port *tnl_port;
223
224 if (!ofport) {
225 return;
226 }
227
228 tnl_port = tnl_find_ofport(ofport);
229 if (tnl_port) {
230 struct hmap **map;
231
232 tnl_port_mod_log(tnl_port, "removing");
233 map = tnl_match_map(&tnl_port->match);
234 hmap_remove(*map, &tnl_port->match_node);
235 if (hmap_is_empty(*map)) {
236 hmap_destroy(*map);
237 free(*map);
238 *map = NULL;
239 }
240 hmap_remove(ofport_map, &tnl_port->ofport_node);
241 netdev_close(tnl_port->netdev);
242 free(tnl_port);
243 }
244 }
245
246 /* Removes 'ofport' from the module. */
247 void
248 tnl_port_del(const struct ofport_dpif *ofport) OVS_EXCLUDED(rwlock)
249 {
250 ovs_rwlock_wrlock(&rwlock);
251 tnl_port_del__(ofport);
252 ovs_rwlock_unlock(&rwlock);
253 }
254
255 /* Looks in the table of tunnels for a tunnel matching the metadata in 'flow'.
256 * Returns the 'ofport' corresponding to the new in_port, or a null pointer if
257 * none is found.
258 *
259 * Callers should verify that 'flow' needs to be received by calling
260 * tnl_port_should_receive() before this function. */
261 const struct ofport_dpif *
262 tnl_port_receive(const struct flow *flow) OVS_EXCLUDED(rwlock)
263 {
264 char *pre_flow_str = NULL;
265 const struct ofport_dpif *ofport;
266 struct tnl_port *tnl_port;
267
268 ovs_rwlock_rdlock(&rwlock);
269 tnl_port = tnl_find(flow);
270 ofport = tnl_port ? tnl_port->ofport : NULL;
271 if (!tnl_port) {
272 char *flow_str = flow_to_string(flow);
273
274 VLOG_WARN_RL(&rl, "receive tunnel port not found (%s)", flow_str);
275 free(flow_str);
276 goto out;
277 }
278
279 if (!VLOG_DROP_DBG(&dbg_rl)) {
280 pre_flow_str = flow_to_string(flow);
281 }
282
283 if (pre_flow_str) {
284 char *post_flow_str = flow_to_string(flow);
285 char *tnl_str = tnl_port_fmt(tnl_port);
286 VLOG_DBG("flow received\n"
287 "%s"
288 " pre: %s\n"
289 "post: %s",
290 tnl_str, pre_flow_str, post_flow_str);
291 free(tnl_str);
292 free(pre_flow_str);
293 free(post_flow_str);
294 }
295
296 out:
297 ovs_rwlock_unlock(&rwlock);
298 return ofport;
299 }
300
301 static bool
302 tnl_ecn_ok(const struct flow *base_flow, struct flow *flow,
303 struct flow_wildcards *wc)
304 {
305 if (is_ip_any(base_flow)) {
306 if ((flow->tunnel.ip_tos & IP_ECN_MASK) == IP_ECN_CE) {
307 wc->masks.nw_tos |= IP_ECN_MASK;
308 if ((base_flow->nw_tos & IP_ECN_MASK) == IP_ECN_NOT_ECT) {
309 VLOG_WARN_RL(&rl, "dropping tunnel packet marked ECN CE"
310 " but is not ECN capable");
311 return false;
312 } else {
313 /* Set the ECN CE value in the tunneled packet. */
314 flow->nw_tos |= IP_ECN_CE;
315 }
316 }
317 }
318
319 return true;
320 }
321
322 /* Should be called at the beginning of action translation to initialize
323 * wildcards and perform any actions based on receiving on tunnel port.
324 *
325 * Returns false if the packet must be dropped. */
326 bool
327 tnl_xlate_init(const struct flow *base_flow, struct flow *flow,
328 struct flow_wildcards *wc)
329 {
330 /* tnl_port_should_receive() examines the 'tunnel.ip_dst' field to
331 * determine the presence of the tunnel metadata. However, since tunnels'
332 * datapath port numbers are different from the non-tunnel ports, and we
333 * always unwildcard the 'in_port', we do not need to unwildcard
334 * the 'tunnel.ip_dst' for non-tunneled packets. */
335 if (tnl_port_should_receive(flow)) {
336 wc->masks.tunnel.tun_id = OVS_BE64_MAX;
337 wc->masks.tunnel.ip_src = OVS_BE32_MAX;
338 wc->masks.tunnel.ip_dst = OVS_BE32_MAX;
339 wc->masks.tunnel.flags = (FLOW_TNL_F_DONT_FRAGMENT |
340 FLOW_TNL_F_CSUM |
341 FLOW_TNL_F_KEY);
342 wc->masks.tunnel.ip_tos = UINT8_MAX;
343 wc->masks.tunnel.ip_ttl = UINT8_MAX;
344 /* The tp_src and tp_dst members in flow_tnl are set to be always
345 * wildcarded, not to unwildcard them here. */
346 wc->masks.tunnel.tp_src = 0;
347 wc->masks.tunnel.tp_dst = 0;
348
349 memset(&wc->masks.pkt_mark, 0xff, sizeof wc->masks.pkt_mark);
350
351 if (!tnl_ecn_ok(base_flow, flow, wc)) {
352 return false;
353 }
354
355 flow->pkt_mark &= ~IPSEC_MARK;
356 }
357
358 return true;
359 }
360
361 /* Given that 'flow' should be output to the ofport corresponding to
362 * 'tnl_port', updates 'flow''s tunnel headers and returns the actual datapath
363 * port that the output should happen on. May return ODPP_NONE if the output
364 * shouldn't occur. */
365 odp_port_t
366 tnl_port_send(const struct ofport_dpif *ofport, struct flow *flow,
367 struct flow_wildcards *wc) OVS_EXCLUDED(rwlock)
368 {
369 const struct netdev_tunnel_config *cfg;
370 struct tnl_port *tnl_port;
371 char *pre_flow_str = NULL;
372 odp_port_t out_port;
373
374 ovs_rwlock_rdlock(&rwlock);
375 tnl_port = tnl_find_ofport(ofport);
376 out_port = tnl_port ? tnl_port->match.odp_port : ODPP_NONE;
377 if (!tnl_port) {
378 goto out;
379 }
380
381 cfg = netdev_get_tunnel_config(tnl_port->netdev);
382 ovs_assert(cfg);
383
384 if (!VLOG_DROP_DBG(&dbg_rl)) {
385 pre_flow_str = flow_to_string(flow);
386 }
387
388 if (!cfg->ip_src_flow) {
389 flow->tunnel.ip_src = tnl_port->match.ip_src;
390 }
391 if (!cfg->ip_dst_flow) {
392 flow->tunnel.ip_dst = tnl_port->match.ip_dst;
393 }
394 flow->pkt_mark = tnl_port->match.pkt_mark;
395
396 if (!cfg->out_key_flow) {
397 flow->tunnel.tun_id = cfg->out_key;
398 }
399
400 if (cfg->ttl_inherit && is_ip_any(flow)) {
401 wc->masks.nw_ttl = 0xff;
402 flow->tunnel.ip_ttl = flow->nw_ttl;
403 } else {
404 flow->tunnel.ip_ttl = cfg->ttl;
405 }
406
407 if (cfg->tos_inherit && is_ip_any(flow)) {
408 wc->masks.nw_tos = IP_DSCP_MASK;
409 flow->tunnel.ip_tos = flow->nw_tos & IP_DSCP_MASK;
410 } else {
411 flow->tunnel.ip_tos = cfg->tos;
412 }
413
414 /* ECN fields are always inherited. */
415 if (is_ip_any(flow)) {
416 wc->masks.nw_tos |= IP_ECN_MASK;
417
418 if ((flow->nw_tos & IP_ECN_MASK) == IP_ECN_CE) {
419 flow->tunnel.ip_tos |= IP_ECN_ECT_0;
420 } else {
421 flow->tunnel.ip_tos |= flow->nw_tos & IP_ECN_MASK;
422 }
423 }
424
425 flow->tunnel.flags = (cfg->dont_fragment ? FLOW_TNL_F_DONT_FRAGMENT : 0)
426 | (cfg->csum ? FLOW_TNL_F_CSUM : 0)
427 | (cfg->out_key_present ? FLOW_TNL_F_KEY : 0);
428
429 if (pre_flow_str) {
430 char *post_flow_str = flow_to_string(flow);
431 char *tnl_str = tnl_port_fmt(tnl_port);
432 VLOG_DBG("flow sent\n"
433 "%s"
434 " pre: %s\n"
435 "post: %s",
436 tnl_str, pre_flow_str, post_flow_str);
437 free(tnl_str);
438 free(pre_flow_str);
439 free(post_flow_str);
440 }
441
442 out:
443 ovs_rwlock_unlock(&rwlock);
444 return out_port;
445 }
446
447 static uint32_t
448 tnl_hash(struct tnl_match *match)
449 {
450 BUILD_ASSERT_DECL(sizeof *match % sizeof(uint32_t) == 0);
451 return hash_words((uint32_t *) match, sizeof *match / sizeof(uint32_t), 0);
452 }
453
454 static struct tnl_port *
455 tnl_find_ofport(const struct ofport_dpif *ofport) OVS_REQ_RDLOCK(rwlock)
456 {
457 struct tnl_port *tnl_port;
458
459 HMAP_FOR_EACH_IN_BUCKET (tnl_port, ofport_node, hash_pointer(ofport, 0),
460 ofport_map) {
461 if (tnl_port->ofport == ofport) {
462 return tnl_port;
463 }
464 }
465 return NULL;
466 }
467
468 static struct tnl_port *
469 tnl_find_exact(struct tnl_match *match, struct hmap *map)
470 OVS_REQ_RDLOCK(rwlock)
471 {
472 if (map) {
473 struct tnl_port *tnl_port;
474
475 HMAP_FOR_EACH_WITH_HASH (tnl_port, match_node, tnl_hash(match), map) {
476 if (!memcmp(match, &tnl_port->match, sizeof *match)) {
477 return tnl_port;
478 }
479 }
480 }
481 return NULL;
482 }
483
484 /* Returns the tnl_port that is the best match for the tunnel data in 'flow',
485 * or NULL if no tnl_port matches 'flow'. */
486 static struct tnl_port *
487 tnl_find(const struct flow *flow) OVS_REQ_RDLOCK(rwlock)
488 {
489 enum ip_src_type ip_src;
490 int in_key_flow;
491 int ip_dst_flow;
492 int i;
493
494 i = 0;
495 for (in_key_flow = 0; in_key_flow < 2; in_key_flow++) {
496 for (ip_dst_flow = 0; ip_dst_flow < 2; ip_dst_flow++) {
497 for (ip_src = 0; ip_src < 3; ip_src++) {
498 struct hmap *map = tnl_match_maps[i];
499
500 if (map) {
501 struct tnl_port *tnl_port;
502 struct tnl_match match;
503
504 memset(&match, 0, sizeof match);
505
506 /* The apparent mix-up of 'ip_dst' and 'ip_src' below is
507 * correct, because "struct tnl_match" is expressed in
508 * terms of packets being sent out, but we are using it
509 * here as a description of how to treat received
510 * packets. */
511 match.in_key = in_key_flow ? 0 : flow->tunnel.tun_id;
512 match.ip_src = (ip_src == IP_SRC_CFG
513 ? flow->tunnel.ip_dst
514 : 0);
515 match.ip_dst = ip_dst_flow ? 0 : flow->tunnel.ip_src;
516 match.odp_port = flow->in_port.odp_port;
517 match.pkt_mark = flow->pkt_mark;
518 match.in_key_flow = in_key_flow;
519 match.ip_dst_flow = ip_dst_flow;
520 match.ip_src_flow = ip_src == IP_SRC_FLOW;
521
522 tnl_port = tnl_find_exact(&match, map);
523 if (tnl_port) {
524 return tnl_port;
525 }
526 }
527
528 i++;
529 }
530 }
531 }
532
533 return NULL;
534 }
535
536 /* Returns a pointer to the 'tnl_match_maps' element corresponding to 'm''s
537 * matching criteria. */
538 static struct hmap **
539 tnl_match_map(const struct tnl_match *m)
540 {
541 enum ip_src_type ip_src;
542
543 ip_src = (m->ip_src_flow ? IP_SRC_FLOW
544 : m->ip_src ? IP_SRC_CFG
545 : IP_SRC_ANY);
546
547 return &tnl_match_maps[6 * m->in_key_flow + 3 * m->ip_dst_flow + ip_src];
548 }
549
550 static void
551 tnl_match_fmt(const struct tnl_match *match, struct ds *ds)
552 OVS_REQ_RDLOCK(rwlock)
553 {
554 if (!match->ip_dst_flow) {
555 ds_put_format(ds, IP_FMT"->"IP_FMT, IP_ARGS(match->ip_src),
556 IP_ARGS(match->ip_dst));
557 } else if (!match->ip_src_flow) {
558 ds_put_format(ds, IP_FMT"->flow", IP_ARGS(match->ip_src));
559 } else {
560 ds_put_cstr(ds, "flow->flow");
561 }
562
563 if (match->in_key_flow) {
564 ds_put_cstr(ds, ", key=flow");
565 } else {
566 ds_put_format(ds, ", key=%#"PRIx64, ntohll(match->in_key));
567 }
568
569 ds_put_format(ds, ", dp port=%"PRIu32, match->odp_port);
570 ds_put_format(ds, ", pkt mark=%"PRIu32, match->pkt_mark);
571 }
572
573 static void
574 tnl_port_mod_log(const struct tnl_port *tnl_port, const char *action)
575 OVS_REQ_RDLOCK(rwlock)
576 {
577 if (VLOG_IS_DBG_ENABLED()) {
578 struct ds ds = DS_EMPTY_INITIALIZER;
579
580 tnl_match_fmt(&tnl_port->match, &ds);
581 VLOG_INFO("%s tunnel port %s (%s)", action,
582 tnl_port_get_name(tnl_port), ds_cstr(&ds));
583 ds_destroy(&ds);
584 }
585 }
586
587 static char *
588 tnl_port_fmt(const struct tnl_port *tnl_port) OVS_REQ_RDLOCK(rwlock)
589 {
590 const struct netdev_tunnel_config *cfg =
591 netdev_get_tunnel_config(tnl_port->netdev);
592 struct ds ds = DS_EMPTY_INITIALIZER;
593
594 ds_put_format(&ds, "port %"PRIu32": %s (%s: ", tnl_port->match.odp_port,
595 tnl_port_get_name(tnl_port),
596 netdev_get_type(tnl_port->netdev));
597 tnl_match_fmt(&tnl_port->match, &ds);
598
599 if (cfg->out_key != cfg->in_key ||
600 cfg->out_key_present != cfg->in_key_present ||
601 cfg->out_key_flow != cfg->in_key_flow) {
602 ds_put_cstr(&ds, ", out_key=");
603 if (!cfg->out_key_present) {
604 ds_put_cstr(&ds, "none");
605 } else if (cfg->out_key_flow) {
606 ds_put_cstr(&ds, "flow");
607 } else {
608 ds_put_format(&ds, "%#"PRIx64, ntohll(cfg->out_key));
609 }
610 }
611
612 if (cfg->ttl_inherit) {
613 ds_put_cstr(&ds, ", ttl=inherit");
614 } else {
615 ds_put_format(&ds, ", ttl=%"PRIu8, cfg->ttl);
616 }
617
618 if (cfg->tos_inherit) {
619 ds_put_cstr(&ds, ", tos=inherit");
620 } else if (cfg->tos) {
621 ds_put_format(&ds, ", tos=%#"PRIx8, cfg->tos);
622 }
623
624 if (!cfg->dont_fragment) {
625 ds_put_cstr(&ds, ", df=false");
626 }
627
628 if (cfg->csum) {
629 ds_put_cstr(&ds, ", csum=true");
630 }
631
632 ds_put_cstr(&ds, ")\n");
633
634 return ds_steal_cstr(&ds);
635 }
636
637 static const char *
638 tnl_port_get_name(const struct tnl_port *tnl_port) OVS_REQ_RDLOCK(rwlock)
639 {
640 return netdev_get_name(tnl_port->netdev);
641 }