1 /* Copyright (c) 2013, 2014, 2015 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 "byte-order.h"
21 #include "connectivity.h"
24 #include "dynamic-string.h"
25 #include "fat-rwlock.h"
32 #include "route-table.h"
35 #include "socket-util.h"
36 #include "tnl-arp-cache.h"
37 #include "tnl-ports.h"
39 #include "openvswitch/vlog.h"
40 #include "unaligned.h"
41 #include "ofproto-dpif.h"
43 VLOG_DEFINE_THIS_MODULE(tunnel
);
45 /* skb mark used for IPsec tunnel packets */
60 struct hmap_node ofport_node
;
61 struct hmap_node match_node
;
63 const struct ofport_dpif
*ofport
;
65 struct netdev
*netdev
;
67 struct tnl_match match
;
70 static struct fat_rwlock rwlock
;
74 * This module maps packets received over tunnel protocols to vports. The
75 * tunnel protocol and, for some protocols, tunnel-specific information (e.g.,
76 * for VXLAN, the UDP destination port number) are always use as part of the
77 * mapping. Which other fields are used for the mapping depends on the vports
78 * themselves (the parenthesized notations refer to "struct tnl_match" fields):
80 * - in_key: A vport may match a specific tunnel ID (in_key_flow == false)
81 * or arrange for the tunnel ID to be matched as tunnel.tun_id in the
82 * OpenFlow flow (in_key_flow == true).
84 * - ip_dst: A vport may match a specific destination IP address
85 * (ip_dst_flow == false) or arrange for the destination IP to be matched
86 * as tunnel.ip_dst in the OpenFlow flow (ip_dst_flow == true).
88 * - ip_src: A vport may match a specific IP source address (ip_src_flow ==
89 * false, ip_src != 0), wildcard all source addresses (ip_src_flow ==
90 * false, ip_src == 0), or arrange for the IP source address to be
91 * handled in the OpenFlow flow table (ip_src_flow == true).
93 * Thus, there are 2 * 2 * 3 == 12 possible ways a vport can match against a
94 * tunnel packet. We number the possibilities for each field in increasing
95 * order as listed in each bullet above. We order the 12 overall combinations
96 * in lexicographic order considering in_key first, then ip_dst, then
98 #define N_MATCH_TYPES (2 * 2 * 3)
100 /* The three possibilities (see above) for vport ip_src matches. */
102 IP_SRC_CFG
, /* ip_src must equal configured address. */
103 IP_SRC_ANY
, /* Any ip_src is acceptable. */
104 IP_SRC_FLOW
/* ip_src is handled in flow table. */
107 /* Each hmap contains "struct tnl_port"s.
108 * The index is a combination of how each of the fields listed under "Tunnel
109 * matches" above matches, see the final paragraph for ordering. */
110 static struct hmap
*tnl_match_maps
[N_MATCH_TYPES
] OVS_GUARDED_BY(rwlock
);
111 static struct hmap
**tnl_match_map(const struct tnl_match
*);
113 static struct hmap ofport_map__
= HMAP_INITIALIZER(&ofport_map__
);
114 static struct hmap
*ofport_map
OVS_GUARDED_BY(rwlock
) = &ofport_map__
;
116 static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(1, 5);
117 static struct vlog_rate_limit dbg_rl
= VLOG_RATE_LIMIT_INIT(60, 60);
119 static struct tnl_port
*tnl_find(const struct flow
*) OVS_REQ_RDLOCK(rwlock
);
120 static struct tnl_port
*tnl_find_exact(struct tnl_match
*, struct hmap
*)
121 OVS_REQ_RDLOCK(rwlock
);
122 static struct tnl_port
*tnl_find_ofport(const struct ofport_dpif
*)
123 OVS_REQ_RDLOCK(rwlock
);
125 static uint32_t tnl_hash(struct tnl_match
*);
126 static void tnl_match_fmt(const struct tnl_match
*, struct ds
*);
127 static char *tnl_port_fmt(const struct tnl_port
*) OVS_REQ_RDLOCK(rwlock
);
128 static void tnl_port_mod_log(const struct tnl_port
*, const char *action
)
129 OVS_REQ_RDLOCK(rwlock
);
130 static const char *tnl_port_get_name(const struct tnl_port
*)
131 OVS_REQ_RDLOCK(rwlock
);
132 static void tnl_port_del__(const struct ofport_dpif
*) OVS_REQ_WRLOCK(rwlock
);
135 ofproto_tunnel_init(void)
137 static struct ovsthread_once once
= OVSTHREAD_ONCE_INITIALIZER
;
139 if (ovsthread_once_start(&once
)) {
140 fat_rwlock_init(&rwlock
);
141 ovsthread_once_done(&once
);
146 tnl_port_add__(const struct ofport_dpif
*ofport
, const struct netdev
*netdev
,
147 odp_port_t odp_port
, bool warn
, bool native_tnl
, const char name
[])
148 OVS_REQ_WRLOCK(rwlock
)
150 const struct netdev_tunnel_config
*cfg
;
151 struct tnl_port
*existing_port
;
152 struct tnl_port
*tnl_port
;
155 cfg
= netdev_get_tunnel_config(netdev
);
158 tnl_port
= xzalloc(sizeof *tnl_port
);
159 tnl_port
->ofport
= ofport
;
160 tnl_port
->netdev
= netdev_ref(netdev
);
161 tnl_port
->change_seq
= netdev_get_change_seq(tnl_port
->netdev
);
163 tnl_port
->match
.in_key
= cfg
->in_key
;
164 tnl_port
->match
.ip_src
= cfg
->ip_src
;
165 tnl_port
->match
.ip_dst
= cfg
->ip_dst
;
166 tnl_port
->match
.ip_src_flow
= cfg
->ip_src_flow
;
167 tnl_port
->match
.ip_dst_flow
= cfg
->ip_dst_flow
;
168 tnl_port
->match
.pkt_mark
= cfg
->ipsec
? IPSEC_MARK
: 0;
169 tnl_port
->match
.in_key_flow
= cfg
->in_key_flow
;
170 tnl_port
->match
.odp_port
= odp_port
;
172 map
= tnl_match_map(&tnl_port
->match
);
173 existing_port
= tnl_find_exact(&tnl_port
->match
, *map
);
176 struct ds ds
= DS_EMPTY_INITIALIZER
;
177 tnl_match_fmt(&tnl_port
->match
, &ds
);
178 VLOG_WARN("%s: attempting to add tunnel port with same config as "
179 "port '%s' (%s)", tnl_port_get_name(tnl_port
),
180 tnl_port_get_name(existing_port
), ds_cstr(&ds
));
183 netdev_close(tnl_port
->netdev
);
188 hmap_insert(ofport_map
, &tnl_port
->ofport_node
, hash_pointer(ofport
, 0));
191 *map
= xmalloc(sizeof **map
);
194 hmap_insert(*map
, &tnl_port
->match_node
, tnl_hash(&tnl_port
->match
));
195 tnl_port_mod_log(tnl_port
, "adding");
198 tnl_port_map_insert(odp_port
, cfg
->dst_port
, name
);
203 /* Adds 'ofport' to the module with datapath port number 'odp_port'. 'ofport's
204 * must be added before they can be used by the module. 'ofport' must be a
207 * Returns 0 if successful, otherwise a positive errno value. */
209 tnl_port_add(const struct ofport_dpif
*ofport
, const struct netdev
*netdev
,
210 odp_port_t odp_port
, bool native_tnl
, const char name
[]) OVS_EXCLUDED(rwlock
)
214 fat_rwlock_wrlock(&rwlock
);
215 ok
= tnl_port_add__(ofport
, netdev
, odp_port
, true, native_tnl
, name
);
216 fat_rwlock_unlock(&rwlock
);
218 return ok
? 0 : EEXIST
;
221 /* Checks if the tunnel represented by 'ofport' reconfiguration due to changes
222 * in its netdev_tunnel_config. If it does, returns true. Otherwise, returns
223 * false. 'ofport' and 'odp_port' should be the same as would be passed to
226 tnl_port_reconfigure(const struct ofport_dpif
*ofport
,
227 const struct netdev
*netdev
, odp_port_t odp_port
,
228 bool native_tnl
, const char name
[])
231 struct tnl_port
*tnl_port
;
232 bool changed
= false;
234 fat_rwlock_wrlock(&rwlock
);
235 tnl_port
= tnl_find_ofport(ofport
);
237 changed
= tnl_port_add__(ofport
, netdev
, odp_port
, false, native_tnl
, name
);
238 } else if (tnl_port
->netdev
!= netdev
239 || tnl_port
->match
.odp_port
!= odp_port
240 || tnl_port
->change_seq
!= netdev_get_change_seq(tnl_port
->netdev
)) {
241 VLOG_DBG("reconfiguring %s", tnl_port_get_name(tnl_port
));
242 tnl_port_del__(ofport
);
243 tnl_port_add__(ofport
, netdev
, odp_port
, true, native_tnl
, name
);
246 fat_rwlock_unlock(&rwlock
);
251 tnl_port_del__(const struct ofport_dpif
*ofport
) OVS_REQ_WRLOCK(rwlock
)
253 struct tnl_port
*tnl_port
;
259 tnl_port
= tnl_find_ofport(ofport
);
261 const struct netdev_tunnel_config
*cfg
=
262 netdev_get_tunnel_config(tnl_port
->netdev
);
265 tnl_port_map_delete(cfg
->dst_port
);
266 tnl_port_mod_log(tnl_port
, "removing");
267 map
= tnl_match_map(&tnl_port
->match
);
268 hmap_remove(*map
, &tnl_port
->match_node
);
269 if (hmap_is_empty(*map
)) {
274 hmap_remove(ofport_map
, &tnl_port
->ofport_node
);
275 netdev_close(tnl_port
->netdev
);
280 /* Removes 'ofport' from the module. */
282 tnl_port_del(const struct ofport_dpif
*ofport
) OVS_EXCLUDED(rwlock
)
284 fat_rwlock_wrlock(&rwlock
);
285 tnl_port_del__(ofport
);
286 fat_rwlock_unlock(&rwlock
);
289 /* Looks in the table of tunnels for a tunnel matching the metadata in 'flow'.
290 * Returns the 'ofport' corresponding to the new in_port, or a null pointer if
293 * Callers should verify that 'flow' needs to be received by calling
294 * tnl_port_should_receive() before this function. */
295 const struct ofport_dpif
*
296 tnl_port_receive(const struct flow
*flow
) OVS_EXCLUDED(rwlock
)
298 char *pre_flow_str
= NULL
;
299 const struct ofport_dpif
*ofport
;
300 struct tnl_port
*tnl_port
;
302 fat_rwlock_rdlock(&rwlock
);
303 tnl_port
= tnl_find(flow
);
304 ofport
= tnl_port
? tnl_port
->ofport
: NULL
;
306 char *flow_str
= flow_to_string(flow
);
308 VLOG_WARN_RL(&rl
, "receive tunnel port not found (%s)", flow_str
);
313 if (!VLOG_DROP_DBG(&dbg_rl
)) {
314 pre_flow_str
= flow_to_string(flow
);
318 char *post_flow_str
= flow_to_string(flow
);
319 char *tnl_str
= tnl_port_fmt(tnl_port
);
320 VLOG_DBG("flow received\n"
324 tnl_str
, pre_flow_str
, post_flow_str
);
331 fat_rwlock_unlock(&rwlock
);
336 tnl_ecn_ok(const struct flow
*base_flow
, struct flow
*flow
,
337 struct flow_wildcards
*wc
)
339 if (is_ip_any(base_flow
)) {
340 if ((flow
->tunnel
.ip_tos
& IP_ECN_MASK
) == IP_ECN_CE
) {
342 wc
->masks
.nw_tos
|= IP_ECN_MASK
;
344 if ((base_flow
->nw_tos
& IP_ECN_MASK
) == IP_ECN_NOT_ECT
) {
345 VLOG_WARN_RL(&rl
, "dropping tunnel packet marked ECN CE"
346 " but is not ECN capable");
349 /* Set the ECN CE value in the tunneled packet. */
350 flow
->nw_tos
|= IP_ECN_CE
;
358 /* Should be called at the beginning of action translation to initialize
359 * wildcards and perform any actions based on receiving on tunnel port.
361 * Returns false if the packet must be dropped. */
363 tnl_xlate_init(const struct flow
*base_flow
, struct flow
*flow
,
364 struct flow_wildcards
*wc
)
366 /* tnl_port_should_receive() examines the 'tunnel.ip_dst' field to
367 * determine the presence of the tunnel metadata. However, since tunnels'
368 * datapath port numbers are different from the non-tunnel ports, and we
369 * always unwildcard the 'in_port', we do not need to unwildcard
370 * the 'tunnel.ip_dst' for non-tunneled packets. */
371 if (tnl_port_should_receive(flow
)) {
373 wc
->masks
.tunnel
.tun_id
= OVS_BE64_MAX
;
374 wc
->masks
.tunnel
.ip_src
= OVS_BE32_MAX
;
375 wc
->masks
.tunnel
.ip_dst
= OVS_BE32_MAX
;
376 wc
->masks
.tunnel
.flags
= (FLOW_TNL_F_DONT_FRAGMENT
|
379 wc
->masks
.tunnel
.ip_tos
= UINT8_MAX
;
380 wc
->masks
.tunnel
.ip_ttl
= UINT8_MAX
;
381 /* The tp_src and tp_dst members in flow_tnl are set to be always
382 * wildcarded, not to unwildcard them here. */
383 wc
->masks
.tunnel
.tp_src
= 0;
384 wc
->masks
.tunnel
.tp_dst
= 0;
386 memset(&wc
->masks
.pkt_mark
, 0xff, sizeof wc
->masks
.pkt_mark
);
388 if (!tnl_ecn_ok(base_flow
, flow
, wc
)) {
392 flow
->pkt_mark
&= ~IPSEC_MARK
;
398 /* Given that 'flow' should be output to the ofport corresponding to
399 * 'tnl_port', updates 'flow''s tunnel headers and returns the actual datapath
400 * port that the output should happen on. May return ODPP_NONE if the output
401 * shouldn't occur. */
403 tnl_port_send(const struct ofport_dpif
*ofport
, struct flow
*flow
,
404 struct flow_wildcards
*wc
) OVS_EXCLUDED(rwlock
)
406 const struct netdev_tunnel_config
*cfg
;
407 struct tnl_port
*tnl_port
;
408 char *pre_flow_str
= NULL
;
411 fat_rwlock_rdlock(&rwlock
);
412 tnl_port
= tnl_find_ofport(ofport
);
413 out_port
= tnl_port
? tnl_port
->match
.odp_port
: ODPP_NONE
;
418 cfg
= netdev_get_tunnel_config(tnl_port
->netdev
);
421 if (!VLOG_DROP_DBG(&dbg_rl
)) {
422 pre_flow_str
= flow_to_string(flow
);
425 if (!cfg
->ip_src_flow
) {
426 flow
->tunnel
.ip_src
= tnl_port
->match
.ip_src
;
428 if (!cfg
->ip_dst_flow
) {
429 flow
->tunnel
.ip_dst
= tnl_port
->match
.ip_dst
;
431 flow
->pkt_mark
= tnl_port
->match
.pkt_mark
;
433 if (!cfg
->out_key_flow
) {
434 flow
->tunnel
.tun_id
= cfg
->out_key
;
437 if (cfg
->ttl_inherit
&& is_ip_any(flow
)) {
438 wc
->masks
.nw_ttl
= 0xff;
439 flow
->tunnel
.ip_ttl
= flow
->nw_ttl
;
441 flow
->tunnel
.ip_ttl
= cfg
->ttl
;
444 if (cfg
->tos_inherit
&& is_ip_any(flow
)) {
445 wc
->masks
.nw_tos
|= IP_DSCP_MASK
;
446 flow
->tunnel
.ip_tos
= flow
->nw_tos
& IP_DSCP_MASK
;
448 flow
->tunnel
.ip_tos
= cfg
->tos
;
451 /* ECN fields are always inherited. */
452 if (is_ip_any(flow
)) {
453 wc
->masks
.nw_tos
|= IP_ECN_MASK
;
455 if ((flow
->nw_tos
& IP_ECN_MASK
) == IP_ECN_CE
) {
456 flow
->tunnel
.ip_tos
|= IP_ECN_ECT_0
;
458 flow
->tunnel
.ip_tos
|= flow
->nw_tos
& IP_ECN_MASK
;
462 flow
->tunnel
.flags
|= (cfg
->dont_fragment
? FLOW_TNL_F_DONT_FRAGMENT
: 0)
463 | (cfg
->csum
? FLOW_TNL_F_CSUM
: 0)
464 | (cfg
->out_key_present
? FLOW_TNL_F_KEY
: 0);
467 char *post_flow_str
= flow_to_string(flow
);
468 char *tnl_str
= tnl_port_fmt(tnl_port
);
469 VLOG_DBG("flow sent\n"
473 tnl_str
, pre_flow_str
, post_flow_str
);
480 fat_rwlock_unlock(&rwlock
);
485 tnl_hash(struct tnl_match
*match
)
487 BUILD_ASSERT_DECL(sizeof *match
% sizeof(uint32_t) == 0);
488 return hash_words((uint32_t *) match
, sizeof *match
/ sizeof(uint32_t), 0);
491 static struct tnl_port
*
492 tnl_find_ofport(const struct ofport_dpif
*ofport
) OVS_REQ_RDLOCK(rwlock
)
494 struct tnl_port
*tnl_port
;
496 HMAP_FOR_EACH_IN_BUCKET (tnl_port
, ofport_node
, hash_pointer(ofport
, 0),
498 if (tnl_port
->ofport
== ofport
) {
505 static struct tnl_port
*
506 tnl_find_exact(struct tnl_match
*match
, struct hmap
*map
)
507 OVS_REQ_RDLOCK(rwlock
)
510 struct tnl_port
*tnl_port
;
512 HMAP_FOR_EACH_WITH_HASH (tnl_port
, match_node
, tnl_hash(match
), map
) {
513 if (!memcmp(match
, &tnl_port
->match
, sizeof *match
)) {
521 /* Returns the tnl_port that is the best match for the tunnel data in 'flow',
522 * or NULL if no tnl_port matches 'flow'. */
523 static struct tnl_port
*
524 tnl_find(const struct flow
*flow
) OVS_REQ_RDLOCK(rwlock
)
526 enum ip_src_type ip_src
;
532 for (in_key_flow
= 0; in_key_flow
< 2; in_key_flow
++) {
533 for (ip_dst_flow
= 0; ip_dst_flow
< 2; ip_dst_flow
++) {
534 for (ip_src
= 0; ip_src
< 3; ip_src
++) {
535 struct hmap
*map
= tnl_match_maps
[i
];
538 struct tnl_port
*tnl_port
;
539 struct tnl_match match
;
541 memset(&match
, 0, sizeof match
);
543 /* The apparent mix-up of 'ip_dst' and 'ip_src' below is
544 * correct, because "struct tnl_match" is expressed in
545 * terms of packets being sent out, but we are using it
546 * here as a description of how to treat received
548 match
.in_key
= in_key_flow
? 0 : flow
->tunnel
.tun_id
;
549 match
.ip_src
= (ip_src
== IP_SRC_CFG
550 ? flow
->tunnel
.ip_dst
552 match
.ip_dst
= ip_dst_flow
? 0 : flow
->tunnel
.ip_src
;
553 match
.odp_port
= flow
->in_port
.odp_port
;
554 match
.pkt_mark
= flow
->pkt_mark
;
555 match
.in_key_flow
= in_key_flow
;
556 match
.ip_dst_flow
= ip_dst_flow
;
557 match
.ip_src_flow
= ip_src
== IP_SRC_FLOW
;
559 tnl_port
= tnl_find_exact(&match
, map
);
573 /* Returns a pointer to the 'tnl_match_maps' element corresponding to 'm''s
574 * matching criteria. */
575 static struct hmap
**
576 tnl_match_map(const struct tnl_match
*m
)
578 enum ip_src_type ip_src
;
580 ip_src
= (m
->ip_src_flow
? IP_SRC_FLOW
581 : m
->ip_src
? IP_SRC_CFG
584 return &tnl_match_maps
[6 * m
->in_key_flow
+ 3 * m
->ip_dst_flow
+ ip_src
];
588 tnl_match_fmt(const struct tnl_match
*match
, struct ds
*ds
)
589 OVS_REQ_RDLOCK(rwlock
)
591 if (!match
->ip_dst_flow
) {
592 ds_put_format(ds
, IP_FMT
"->"IP_FMT
, IP_ARGS(match
->ip_src
),
593 IP_ARGS(match
->ip_dst
));
594 } else if (!match
->ip_src_flow
) {
595 ds_put_format(ds
, IP_FMT
"->flow", IP_ARGS(match
->ip_src
));
597 ds_put_cstr(ds
, "flow->flow");
600 if (match
->in_key_flow
) {
601 ds_put_cstr(ds
, ", key=flow");
603 ds_put_format(ds
, ", key=%#"PRIx64
, ntohll(match
->in_key
));
606 ds_put_format(ds
, ", dp port=%"PRIu32
, match
->odp_port
);
607 ds_put_format(ds
, ", pkt mark=%"PRIu32
, match
->pkt_mark
);
611 tnl_port_mod_log(const struct tnl_port
*tnl_port
, const char *action
)
612 OVS_REQ_RDLOCK(rwlock
)
614 if (VLOG_IS_DBG_ENABLED()) {
615 struct ds ds
= DS_EMPTY_INITIALIZER
;
617 tnl_match_fmt(&tnl_port
->match
, &ds
);
618 VLOG_INFO("%s tunnel port %s (%s)", action
,
619 tnl_port_get_name(tnl_port
), ds_cstr(&ds
));
625 tnl_port_fmt(const struct tnl_port
*tnl_port
) OVS_REQ_RDLOCK(rwlock
)
627 const struct netdev_tunnel_config
*cfg
=
628 netdev_get_tunnel_config(tnl_port
->netdev
);
629 struct ds ds
= DS_EMPTY_INITIALIZER
;
631 ds_put_format(&ds
, "port %"PRIu32
": %s (%s: ", tnl_port
->match
.odp_port
,
632 tnl_port_get_name(tnl_port
),
633 netdev_get_type(tnl_port
->netdev
));
634 tnl_match_fmt(&tnl_port
->match
, &ds
);
636 if (cfg
->out_key
!= cfg
->in_key
||
637 cfg
->out_key_present
!= cfg
->in_key_present
||
638 cfg
->out_key_flow
!= cfg
->in_key_flow
) {
639 ds_put_cstr(&ds
, ", out_key=");
640 if (!cfg
->out_key_present
) {
641 ds_put_cstr(&ds
, "none");
642 } else if (cfg
->out_key_flow
) {
643 ds_put_cstr(&ds
, "flow");
645 ds_put_format(&ds
, "%#"PRIx64
, ntohll(cfg
->out_key
));
649 if (cfg
->ttl_inherit
) {
650 ds_put_cstr(&ds
, ", ttl=inherit");
652 ds_put_format(&ds
, ", ttl=%"PRIu8
, cfg
->ttl
);
655 if (cfg
->tos_inherit
) {
656 ds_put_cstr(&ds
, ", tos=inherit");
657 } else if (cfg
->tos
) {
658 ds_put_format(&ds
, ", tos=%#"PRIx8
, cfg
->tos
);
661 if (!cfg
->dont_fragment
) {
662 ds_put_cstr(&ds
, ", df=false");
666 ds_put_cstr(&ds
, ", csum=true");
669 ds_put_cstr(&ds
, ")\n");
671 return ds_steal_cstr(&ds
);
675 tnl_port_get_name(const struct tnl_port
*tnl_port
) OVS_REQ_RDLOCK(rwlock
)
677 return netdev_get_name(tnl_port
->netdev
);
681 tnl_port_build_header(const struct ofport_dpif
*ofport
,
682 const struct flow
*tnl_flow
,
683 uint8_t dmac
[ETH_ADDR_LEN
],
684 uint8_t smac
[ETH_ADDR_LEN
],
685 ovs_be32 ip_src
, struct ovs_action_push_tnl
*data
)
687 struct tnl_port
*tnl_port
;
688 struct eth_header
*eth
;
689 struct ip_header
*ip
;
693 fat_rwlock_rdlock(&rwlock
);
694 tnl_port
= tnl_find_ofport(ofport
);
695 ovs_assert(tnl_port
);
697 /* Build Ethernet and IP headers. */
698 memset(data
->header
, 0, sizeof data
->header
);
700 eth
= (struct eth_header
*)data
->header
;
701 memcpy(eth
->eth_dst
, dmac
, ETH_ADDR_LEN
);
702 memcpy(eth
->eth_src
, smac
, ETH_ADDR_LEN
);
703 eth
->eth_type
= htons(ETH_TYPE_IP
);
706 ip
= (struct ip_header
*) l3
;
708 ip
->ip_ihl_ver
= IP_IHL_VER(5, 4);
709 ip
->ip_tos
= tnl_flow
->tunnel
.ip_tos
;
710 ip
->ip_ttl
= tnl_flow
->tunnel
.ip_ttl
;
711 ip
->ip_frag_off
= (tnl_flow
->tunnel
.flags
& FLOW_TNL_F_DONT_FRAGMENT
) ?
714 put_16aligned_be32(&ip
->ip_src
, ip_src
);
715 put_16aligned_be32(&ip
->ip_dst
, tnl_flow
->tunnel
.ip_dst
);
717 res
= netdev_build_header(tnl_port
->netdev
, data
, tnl_flow
);
718 ip
->ip_csum
= csum(ip
, sizeof *ip
);
719 fat_rwlock_unlock(&rwlock
);