1 /* Copyright (c) 2009, 2010, 2011, 2012, 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. */
17 #include "ofproto/ofproto-dpif-xlate.h"
23 #include "byte-order.h"
28 #include "dynamic-string.h"
33 #include "mac-learning.h"
34 #include "meta-flow.h"
35 #include "multipath.h"
36 #include "netdev-vport.h"
39 #include "odp-execute.h"
40 #include "ofp-actions.h"
41 #include "ofproto/ofproto-dpif-ipfix.h"
42 #include "ofproto/ofproto-dpif-mirror.h"
43 #include "ofproto/ofproto-dpif-sflow.h"
44 #include "ofproto/ofproto-dpif.h"
48 COVERAGE_DEFINE(xlate_actions);
50 VLOG_DEFINE_THIS_MODULE(ofproto_dpif_xlate);
52 /* Maximum depth of flow table recursion (due to resubmit actions) in a
53 * flow translation. */
54 #define MAX_RESUBMIT_RECURSION 64
57 struct hmap_node hmap_node; /* Node in global 'xbridges' map. */
58 struct ofproto_dpif *ofproto; /* Key in global 'xbridges' map. */
60 struct list xbundles; /* Owned xbundles. */
61 struct hmap xports; /* Indexed by ofp_port. */
63 char *name; /* Name used in log messages. */
64 struct mac_learning *ml; /* Mac learning handle. */
65 struct mbridge *mbridge; /* Mirroring. */
66 struct dpif_sflow *sflow; /* SFlow handle, or null. */
67 struct dpif_ipfix *ipfix; /* Ipfix handle, or null. */
69 enum ofp_config_flags frag; /* Fragmentation handling. */
70 bool has_stp; /* Bridge runs stp? */
71 bool has_netflow; /* Bridge runs netflow? */
72 bool has_in_band; /* Bridge has in band control? */
73 bool forward_bpdu; /* Bridge forwards STP BPDUs? */
77 struct hmap_node hmap_node; /* In global 'xbundles' map. */
78 struct ofbundle *ofbundle; /* Key in global 'xbundles' map. */
80 struct list list_node; /* In parent 'xbridges' list. */
81 struct xbridge *xbridge; /* Parent xbridge. */
83 struct list xports; /* Contains "struct xport"s. */
85 char *name; /* Name used in log messages. */
86 struct bond *bond; /* Nonnull iff more than one port. */
87 struct lacp *lacp; /* LACP handle or null. */
89 enum port_vlan_mode vlan_mode; /* VLAN mode. */
90 int vlan; /* -1=trunk port, else a 12-bit VLAN ID. */
91 unsigned long *trunks; /* Bitmap of trunked VLANs, if 'vlan' == -1.
92 * NULL if all VLANs are trunked. */
93 bool use_priority_tags; /* Use 802.1p tag for frames in VLAN 0? */
94 bool floodable; /* No port has OFPUTIL_PC_NO_FLOOD set? */
98 struct hmap_node hmap_node; /* Node in global 'xports' map. */
99 struct ofport_dpif *ofport; /* Key in global 'xports map. */
101 struct hmap_node ofp_node; /* Node in parent xbridge 'xports' map. */
102 ofp_port_t ofp_port; /* Key in parent xbridge 'xports' map. */
104 odp_port_t odp_port; /* Datapath port number or ODPP_NONE. */
106 struct list bundle_node; /* In parent xbundle (if it exists). */
107 struct xbundle *xbundle; /* Parent xbundle or null. */
109 struct netdev *netdev; /* 'ofport''s netdev. */
111 struct xbridge *xbridge; /* Parent bridge. */
112 struct xport *peer; /* Patch port peer or null. */
114 enum ofputil_port_config config; /* OpenFlow port configuration. */
115 enum stp_state stp_state; /* STP_DISABLED if STP not in use. */
117 bool may_enable; /* May be enabled in bonds. */
118 bool is_tunnel; /* Is a tunnel port. */
120 struct cfm *cfm; /* CFM handle or null. */
121 struct bfd *bfd; /* BFD handle or null. */
125 struct xlate_in *xin;
126 struct xlate_out *xout;
128 const struct xbridge *xbridge;
130 /* Flow at the last commit. */
131 struct flow base_flow;
133 /* Tunnel IP destination address as received. This is stored separately
134 * as the base_flow.tunnel is cleared on init to reflect the datapath
135 * behavior. Used to make sure not to send tunneled output to ourselves,
136 * which might lead to an infinite loop. This could happen easily
137 * if a tunnel is marked as 'ip_remote=flow', and the flow does not
138 * actually set the tun_dst field. */
139 ovs_be32 orig_tunnel_ip_dst;
141 /* Stack for the push and pop actions. Each stack element is of type
142 * "union mf_subvalue". */
143 union mf_subvalue init_stack[1024 / sizeof(union mf_subvalue)];
146 /* The rule that we are currently translating, or NULL. */
147 struct rule_dpif *rule;
149 int recurse; /* Recursion level, via xlate_table_action. */
150 bool max_resubmit_trigger; /* Recursed too deeply during translation. */
151 uint32_t orig_skb_priority; /* Priority when packet arrived. */
152 uint8_t table_id; /* OpenFlow table ID where flow was found. */
153 uint32_t sflow_n_outputs; /* Number of output ports. */
154 odp_port_t sflow_odp_port; /* Output port for composing sFlow action. */
155 uint16_t user_cookie_offset;/* Used for user_action_cookie fixup. */
156 bool exit; /* No further actions should be processed. */
159 /* A controller may use OFPP_NONE as the ingress port to indicate that
160 * it did not arrive on a "real" port. 'ofpp_none_bundle' exists for
161 * when an input bundle is needed for validation (e.g., mirroring or
162 * OFPP_NORMAL processing). It is not connected to an 'ofproto' or have
163 * any 'port' structs, so care must be taken when dealing with it.
164 * The bundle's name and vlan mode are initialized in lookup_input_bundle() */
165 static struct xbundle ofpp_none_bundle;
167 static struct hmap xbridges = HMAP_INITIALIZER(&xbridges);
168 static struct hmap xbundles = HMAP_INITIALIZER(&xbundles);
169 static struct hmap xports = HMAP_INITIALIZER(&xports);
171 static bool may_receive(const struct xport *, struct xlate_ctx *);
172 static void do_xlate_actions(const struct ofpact *, size_t ofpacts_len,
174 static void xlate_normal(struct xlate_ctx *);
175 static void xlate_report(struct xlate_ctx *, const char *);
176 static void xlate_table_action(struct xlate_ctx *, ofp_port_t in_port,
177 uint8_t table_id, bool may_packet_in);
178 static bool input_vid_is_valid(uint16_t vid, struct xbundle *, bool warn);
179 static uint16_t input_vid_to_vlan(const struct xbundle *, uint16_t vid);
180 static void output_normal(struct xlate_ctx *, const struct xbundle *,
182 static void compose_output_action(struct xlate_ctx *, ofp_port_t ofp_port);
184 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
186 static struct xbridge *xbridge_lookup(const struct ofproto_dpif *);
187 static struct xbundle *xbundle_lookup(const struct ofbundle *);
188 static struct xport *xport_lookup(struct ofport_dpif *);
189 static struct xport *get_ofp_port(const struct xbridge *, ofp_port_t ofp_port);
192 xlate_ofproto_set(struct ofproto_dpif *ofproto, const char *name,
193 const struct mac_learning *ml, const struct mbridge *mbridge,
194 const struct dpif_sflow *sflow,
195 const struct dpif_ipfix *ipfix, enum ofp_config_flags frag,
196 bool forward_bpdu, bool has_in_band, bool has_netflow,
199 struct xbridge *xbridge = xbridge_lookup(ofproto);
202 xbridge = xzalloc(sizeof *xbridge);
203 xbridge->ofproto = ofproto;
205 hmap_insert(&xbridges, &xbridge->hmap_node, hash_pointer(ofproto, 0));
206 hmap_init(&xbridge->xports);
207 list_init(&xbridge->xbundles);
210 if (xbridge->ml != ml) {
211 mac_learning_unref(xbridge->ml);
212 xbridge->ml = mac_learning_ref(ml);
215 if (xbridge->mbridge != mbridge) {
216 mbridge_unref(xbridge->mbridge);
217 xbridge->mbridge = mbridge_ref(mbridge);
220 if (xbridge->sflow != sflow) {
221 dpif_sflow_unref(xbridge->sflow);
222 xbridge->sflow = dpif_sflow_ref(sflow);
225 if (xbridge->ipfix != ipfix) {
226 dpif_ipfix_unref(xbridge->ipfix);
227 xbridge->ipfix = dpif_ipfix_ref(ipfix);
231 xbridge->name = xstrdup(name);
233 xbridge->forward_bpdu = forward_bpdu;
234 xbridge->has_in_band = has_in_band;
235 xbridge->has_netflow = has_netflow;
236 xbridge->has_stp = has_stp;
237 xbridge->frag = frag;
241 xlate_remove_ofproto(struct ofproto_dpif *ofproto)
243 struct xbridge *xbridge = xbridge_lookup(ofproto);
244 struct xbundle *xbundle, *next_xbundle;
245 struct xport *xport, *next_xport;
251 HMAP_FOR_EACH_SAFE (xport, next_xport, ofp_node, &xbridge->xports) {
252 xlate_ofport_remove(xport->ofport);
255 LIST_FOR_EACH_SAFE (xbundle, next_xbundle, list_node, &xbridge->xbundles) {
256 xlate_bundle_remove(xbundle->ofbundle);
259 hmap_remove(&xbridges, &xbridge->hmap_node);
265 xlate_bundle_set(struct ofproto_dpif *ofproto, struct ofbundle *ofbundle,
266 const char *name, enum port_vlan_mode vlan_mode, int vlan,
267 unsigned long *trunks, bool use_priority_tags,
268 const struct bond *bond, const struct lacp *lacp,
271 struct xbundle *xbundle = xbundle_lookup(ofbundle);
274 xbundle = xzalloc(sizeof *xbundle);
275 xbundle->ofbundle = ofbundle;
276 xbundle->xbridge = xbridge_lookup(ofproto);
278 hmap_insert(&xbundles, &xbundle->hmap_node, hash_pointer(ofbundle, 0));
279 list_insert(&xbundle->xbridge->xbundles, &xbundle->list_node);
280 list_init(&xbundle->xports);
283 ovs_assert(xbundle->xbridge);
286 xbundle->name = xstrdup(name);
288 xbundle->vlan_mode = vlan_mode;
289 xbundle->vlan = vlan;
290 xbundle->trunks = trunks;
291 xbundle->use_priority_tags = use_priority_tags;
292 xbundle->floodable = floodable;
294 if (xbundle->bond != bond) {
295 bond_unref(xbundle->bond);
296 xbundle->bond = bond_ref(bond);
299 if (xbundle->lacp != lacp) {
300 lacp_unref(xbundle->lacp);
301 xbundle->lacp = lacp_ref(lacp);
306 xlate_bundle_remove(struct ofbundle *ofbundle)
308 struct xbundle *xbundle = xbundle_lookup(ofbundle);
309 struct xport *xport, *next;
315 LIST_FOR_EACH_SAFE (xport, next, bundle_node, &xbundle->xports) {
316 list_remove(&xport->bundle_node);
317 xport->xbundle = NULL;
320 hmap_remove(&xbundles, &xbundle->hmap_node);
321 list_remove(&xbundle->list_node);
322 bond_unref(xbundle->bond);
323 lacp_unref(xbundle->lacp);
329 xlate_ofport_set(struct ofproto_dpif *ofproto, struct ofbundle *ofbundle,
330 struct ofport_dpif *ofport, ofp_port_t ofp_port,
331 odp_port_t odp_port, const struct netdev *netdev,
332 const struct cfm *cfm, const struct bfd *bfd,
333 struct ofport_dpif *peer, enum ofputil_port_config config,
334 enum stp_state stp_state, bool is_tunnel, bool may_enable)
336 struct xport *xport = xport_lookup(ofport);
339 xport = xzalloc(sizeof *xport);
340 xport->ofport = ofport;
341 xport->xbridge = xbridge_lookup(ofproto);
342 xport->ofp_port = ofp_port;
344 hmap_insert(&xports, &xport->hmap_node, hash_pointer(ofport, 0));
345 hmap_insert(&xport->xbridge->xports, &xport->ofp_node,
346 hash_ofp_port(xport->ofp_port));
349 ovs_assert(xport->ofp_port == ofp_port);
351 xport->config = config;
352 xport->stp_state = stp_state;
353 xport->is_tunnel = is_tunnel;
354 xport->may_enable = may_enable;
355 xport->odp_port = odp_port;
357 if (xport->netdev != netdev) {
358 netdev_close(xport->netdev);
359 xport->netdev = netdev_ref(netdev);
362 if (xport->cfm != cfm) {
363 cfm_unref(xport->cfm);
364 xport->cfm = cfm_ref(cfm);
367 if (xport->bfd != bfd) {
368 bfd_unref(xport->bfd);
369 xport->bfd = bfd_ref(bfd);
373 xport->peer->peer = NULL;
375 xport->peer = peer ? xport_lookup(peer) : NULL;
377 xport->peer->peer = xport;
380 if (xport->xbundle) {
381 list_remove(&xport->bundle_node);
383 xport->xbundle = ofbundle ? xbundle_lookup(ofbundle) : NULL;
384 if (xport->xbundle) {
385 list_insert(&xport->xbundle->xports, &xport->bundle_node);
390 xlate_ofport_remove(struct ofport_dpif *ofport)
392 struct xport *xport = xport_lookup(ofport);
399 xport->peer->peer = NULL;
403 if (xport->xbundle) {
404 list_remove(&xport->bundle_node);
407 hmap_remove(&xports, &xport->hmap_node);
408 hmap_remove(&xport->xbridge->xports, &xport->ofp_node);
410 netdev_close(xport->netdev);
411 cfm_unref(xport->cfm);
412 bfd_unref(xport->bfd);
416 static struct xbridge *
417 xbridge_lookup(const struct ofproto_dpif *ofproto)
419 struct xbridge *xbridge;
421 HMAP_FOR_EACH_IN_BUCKET (xbridge, hmap_node, hash_pointer(ofproto, 0),
423 if (xbridge->ofproto == ofproto) {
430 static struct xbundle *
431 xbundle_lookup(const struct ofbundle *ofbundle)
433 struct xbundle *xbundle;
435 HMAP_FOR_EACH_IN_BUCKET (xbundle, hmap_node, hash_pointer(ofbundle, 0),
437 if (xbundle->ofbundle == ofbundle) {
444 static struct xport *
445 xport_lookup(struct ofport_dpif *ofport)
449 HMAP_FOR_EACH_IN_BUCKET (xport, hmap_node, hash_pointer(ofport, 0),
451 if (xport->ofport == ofport) {
458 static struct xport *
459 get_ofp_port(const struct xbridge *xbridge, ofp_port_t ofp_port)
463 HMAP_FOR_EACH_IN_BUCKET (xport, ofp_node, hash_ofp_port(ofp_port),
465 if (xport->ofp_port == ofp_port) {
473 ofp_port_to_odp_port(const struct xbridge *xbridge, ofp_port_t ofp_port)
475 const struct xport *xport = get_ofp_port(xbridge, ofp_port);
476 return xport ? xport->odp_port : ODPP_NONE;
480 xbundle_trunks_vlan(const struct xbundle *bundle, uint16_t vlan)
482 return (bundle->vlan_mode != PORT_VLAN_ACCESS
483 && (!bundle->trunks || bitmap_is_set(bundle->trunks, vlan)));
487 xbundle_includes_vlan(const struct xbundle *xbundle, uint16_t vlan)
489 return vlan == xbundle->vlan || xbundle_trunks_vlan(xbundle, vlan);
493 xbundle_mirror_out(const struct xbridge *xbridge, struct xbundle *xbundle)
495 return xbundle != &ofpp_none_bundle
496 ? mirror_bundle_out(xbridge->mbridge, xbundle->ofbundle)
501 xbundle_mirror_src(const struct xbridge *xbridge, struct xbundle *xbundle)
503 return xbundle != &ofpp_none_bundle
504 ? mirror_bundle_src(xbridge->mbridge, xbundle->ofbundle)
509 xbundle_mirror_dst(const struct xbridge *xbridge, struct xbundle *xbundle)
511 return xbundle != &ofpp_none_bundle
512 ? mirror_bundle_dst(xbridge->mbridge, xbundle->ofbundle)
516 static struct xbundle *
517 lookup_input_bundle(const struct xbridge *xbridge, ofp_port_t in_port,
518 bool warn, struct xport **in_xportp)
522 /* Find the port and bundle for the received packet. */
523 xport = get_ofp_port(xbridge, in_port);
527 if (xport && xport->xbundle) {
528 return xport->xbundle;
531 /* Special-case OFPP_NONE, which a controller may use as the ingress
532 * port for traffic that it is sourcing. */
533 if (in_port == OFPP_NONE) {
534 ofpp_none_bundle.name = "OFPP_NONE";
535 ofpp_none_bundle.vlan_mode = PORT_VLAN_TRUNK;
536 return &ofpp_none_bundle;
539 /* Odd. A few possible reasons here:
541 * - We deleted a port but there are still a few packets queued up
544 * - Someone externally added a port (e.g. "ovs-dpctl add-if") that
545 * we don't know about.
547 * - The ofproto client didn't configure the port as part of a bundle.
548 * This is particularly likely to happen if a packet was received on the
549 * port after it was created, but before the client had a chance to
550 * configure its bundle.
553 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
555 VLOG_WARN_RL(&rl, "bridge %s: received packet on unknown "
556 "port %"PRIu16, xbridge->name, in_port);
562 add_mirror_actions(struct xlate_ctx *ctx, const struct flow *orig_flow)
564 const struct xbridge *xbridge = ctx->xbridge;
565 mirror_mask_t mirrors;
566 struct xbundle *in_xbundle;
570 mirrors = ctx->xout->mirrors;
571 ctx->xout->mirrors = 0;
573 in_xbundle = lookup_input_bundle(xbridge, orig_flow->in_port.ofp_port,
574 ctx->xin->packet != NULL, NULL);
578 mirrors |= xbundle_mirror_src(xbridge, in_xbundle);
580 /* Drop frames on bundles reserved for mirroring. */
581 if (xbundle_mirror_out(xbridge, in_xbundle)) {
582 if (ctx->xin->packet != NULL) {
583 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
584 VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port "
585 "%s, which is reserved exclusively for mirroring",
586 ctx->xbridge->name, in_xbundle->name);
588 ofpbuf_clear(&ctx->xout->odp_actions);
593 vid = vlan_tci_to_vid(orig_flow->vlan_tci);
594 if (!input_vid_is_valid(vid, in_xbundle, ctx->xin->packet != NULL)) {
597 vlan = input_vid_to_vlan(in_xbundle, vid);
603 /* Restore the original packet before adding the mirror actions. */
604 ctx->xin->flow = *orig_flow;
607 mirror_mask_t dup_mirrors;
608 struct ofbundle *out;
609 unsigned long *vlans;
614 has_mirror = mirror_get(xbridge->mbridge, mirror_mask_ffs(mirrors) - 1,
615 &vlans, &dup_mirrors, &out, &out_vlan);
616 ovs_assert(has_mirror);
619 ctx->xout->wc.masks.vlan_tci |= htons(VLAN_CFI | VLAN_VID_MASK);
621 vlan_mirrored = !vlans || bitmap_is_set(vlans, vlan);
624 if (!vlan_mirrored) {
625 mirrors = zero_rightmost_1bit(mirrors);
629 mirrors &= ~dup_mirrors;
630 ctx->xout->mirrors |= dup_mirrors;
632 struct xbundle *out_xbundle = xbundle_lookup(out);
634 output_normal(ctx, out_xbundle, vlan);
636 } else if (vlan != out_vlan
637 && !eth_addr_is_reserved(orig_flow->dl_dst)) {
638 struct xbundle *xbundle;
640 LIST_FOR_EACH (xbundle, list_node, &xbridge->xbundles) {
641 if (xbundle_includes_vlan(xbundle, out_vlan)
642 && !xbundle_mirror_out(xbridge, xbundle)) {
643 output_normal(ctx, xbundle, out_vlan);
650 /* Given 'vid', the VID obtained from the 802.1Q header that was received as
651 * part of a packet (specify 0 if there was no 802.1Q header), and 'in_xbundle',
652 * the bundle on which the packet was received, returns the VLAN to which the
655 * Both 'vid' and the return value are in the range 0...4095. */
657 input_vid_to_vlan(const struct xbundle *in_xbundle, uint16_t vid)
659 switch (in_xbundle->vlan_mode) {
660 case PORT_VLAN_ACCESS:
661 return in_xbundle->vlan;
664 case PORT_VLAN_TRUNK:
667 case PORT_VLAN_NATIVE_UNTAGGED:
668 case PORT_VLAN_NATIVE_TAGGED:
669 return vid ? vid : in_xbundle->vlan;
676 /* Checks whether a packet with the given 'vid' may ingress on 'in_xbundle'.
677 * If so, returns true. Otherwise, returns false and, if 'warn' is true, logs
680 * 'vid' should be the VID obtained from the 802.1Q header that was received as
681 * part of a packet (specify 0 if there was no 802.1Q header), in the range
684 input_vid_is_valid(uint16_t vid, struct xbundle *in_xbundle, bool warn)
686 /* Allow any VID on the OFPP_NONE port. */
687 if (in_xbundle == &ofpp_none_bundle) {
691 switch (in_xbundle->vlan_mode) {
692 case PORT_VLAN_ACCESS:
695 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
696 VLOG_WARN_RL(&rl, "dropping VLAN %"PRIu16" tagged "
697 "packet received on port %s configured as VLAN "
698 "%"PRIu16" access port", vid, in_xbundle->name,
705 case PORT_VLAN_NATIVE_UNTAGGED:
706 case PORT_VLAN_NATIVE_TAGGED:
708 /* Port must always carry its native VLAN. */
712 case PORT_VLAN_TRUNK:
713 if (!xbundle_includes_vlan(in_xbundle, vid)) {
715 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
716 VLOG_WARN_RL(&rl, "dropping VLAN %"PRIu16" packet "
717 "received on port %s not configured for trunking "
718 "VLAN %"PRIu16, vid, in_xbundle->name, vid);
730 /* Given 'vlan', the VLAN that a packet belongs to, and
731 * 'out_xbundle', a bundle on which the packet is to be output, returns the VID
732 * that should be included in the 802.1Q header. (If the return value is 0,
733 * then the 802.1Q header should only be included in the packet if there is a
736 * Both 'vlan' and the return value are in the range 0...4095. */
738 output_vlan_to_vid(const struct xbundle *out_xbundle, uint16_t vlan)
740 switch (out_xbundle->vlan_mode) {
741 case PORT_VLAN_ACCESS:
744 case PORT_VLAN_TRUNK:
745 case PORT_VLAN_NATIVE_TAGGED:
748 case PORT_VLAN_NATIVE_UNTAGGED:
749 return vlan == out_xbundle->vlan ? 0 : vlan;
757 output_normal(struct xlate_ctx *ctx, const struct xbundle *out_xbundle,
760 ovs_be16 *flow_tci = &ctx->xin->flow.vlan_tci;
762 ovs_be16 tci, old_tci;
765 vid = output_vlan_to_vid(out_xbundle, vlan);
766 if (list_is_empty(&out_xbundle->xports)) {
767 /* Partially configured bundle with no slaves. Drop the packet. */
769 } else if (!out_xbundle->bond) {
770 xport = CONTAINER_OF(list_front(&out_xbundle->xports), struct xport,
773 struct ofport_dpif *ofport;
775 ofport = bond_choose_output_slave(out_xbundle->bond, &ctx->xin->flow,
778 xport = ofport ? xport_lookup(ofport) : NULL;
781 /* No slaves enabled, so drop packet. */
788 if (tci || out_xbundle->use_priority_tags) {
789 tci |= *flow_tci & htons(VLAN_PCP_MASK);
791 tci |= htons(VLAN_CFI);
796 compose_output_action(ctx, xport->ofp_port);
800 /* A VM broadcasts a gratuitous ARP to indicate that it has resumed after
801 * migration. Older Citrix-patched Linux DomU used gratuitous ARP replies to
802 * indicate this; newer upstream kernels use gratuitous ARP requests. */
804 is_gratuitous_arp(const struct flow *flow, struct flow_wildcards *wc)
806 if (flow->dl_type != htons(ETH_TYPE_ARP)) {
810 memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
811 if (!eth_addr_is_broadcast(flow->dl_dst)) {
815 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
816 if (flow->nw_proto == ARP_OP_REPLY) {
818 } else if (flow->nw_proto == ARP_OP_REQUEST) {
819 memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
820 memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
822 return flow->nw_src == flow->nw_dst;
829 update_learning_table(const struct xbridge *xbridge,
830 const struct flow *flow, struct flow_wildcards *wc,
831 int vlan, struct xbundle *in_xbundle)
833 struct mac_entry *mac;
835 /* Don't learn the OFPP_NONE port. */
836 if (in_xbundle == &ofpp_none_bundle) {
840 ovs_rwlock_wrlock(&xbridge->ml->rwlock);
841 if (!mac_learning_may_learn(xbridge->ml, flow->dl_src, vlan)) {
845 mac = mac_learning_insert(xbridge->ml, flow->dl_src, vlan);
846 if (is_gratuitous_arp(flow, wc)) {
847 /* We don't want to learn from gratuitous ARP packets that are
848 * reflected back over bond slaves so we lock the learning table. */
849 if (!in_xbundle->bond) {
850 mac_entry_set_grat_arp_lock(mac);
851 } else if (mac_entry_is_grat_arp_locked(mac)) {
856 if (mac_entry_is_new(mac) || mac->port.p != in_xbundle->ofbundle) {
857 /* The log messages here could actually be useful in debugging,
858 * so keep the rate limit relatively high. */
859 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 300);
860 VLOG_DBG_RL(&rl, "bridge %s: learned that "ETH_ADDR_FMT" is "
861 "on port %s in VLAN %d",
862 xbridge->name, ETH_ADDR_ARGS(flow->dl_src),
863 in_xbundle->name, vlan);
865 mac->port.p = in_xbundle->ofbundle;
866 mac_learning_changed(xbridge->ml, mac);
869 ovs_rwlock_unlock(&xbridge->ml->rwlock);
872 /* Determines whether packets in 'flow' within 'xbridge' should be forwarded or
873 * dropped. Returns true if they may be forwarded, false if they should be
876 * 'in_port' must be the xport that corresponds to flow->in_port.
877 * 'in_port' must be part of a bundle (e.g. in_port->bundle must be nonnull).
879 * 'vlan' must be the VLAN that corresponds to flow->vlan_tci on 'in_port', as
880 * returned by input_vid_to_vlan(). It must be a valid VLAN for 'in_port', as
881 * checked by input_vid_is_valid().
883 * May also add tags to '*tags', although the current implementation only does
884 * so in one special case.
887 is_admissible(struct xlate_ctx *ctx, struct xport *in_port,
890 struct xbundle *in_xbundle = in_port->xbundle;
891 const struct xbridge *xbridge = ctx->xbridge;
892 struct flow *flow = &ctx->xin->flow;
894 /* Drop frames for reserved multicast addresses
895 * only if forward_bpdu option is absent. */
896 if (!xbridge->forward_bpdu && eth_addr_is_reserved(flow->dl_dst)) {
897 xlate_report(ctx, "packet has reserved destination MAC, dropping");
901 if (in_xbundle->bond) {
902 struct mac_entry *mac;
904 switch (bond_check_admissibility(in_xbundle->bond, in_port->ofport,
905 flow->dl_dst, &ctx->xout->tags)) {
910 xlate_report(ctx, "bonding refused admissibility, dropping");
913 case BV_DROP_IF_MOVED:
914 ovs_rwlock_rdlock(&xbridge->ml->rwlock);
915 mac = mac_learning_lookup(xbridge->ml, flow->dl_src, vlan, NULL);
916 if (mac && mac->port.p != in_xbundle->ofbundle &&
917 (!is_gratuitous_arp(flow, &ctx->xout->wc)
918 || mac_entry_is_grat_arp_locked(mac))) {
919 ovs_rwlock_unlock(&xbridge->ml->rwlock);
920 xlate_report(ctx, "SLB bond thinks this packet looped back, "
924 ovs_rwlock_unlock(&xbridge->ml->rwlock);
933 xlate_normal(struct xlate_ctx *ctx)
935 struct flow_wildcards *wc = &ctx->xout->wc;
936 struct flow *flow = &ctx->xin->flow;
937 struct xbundle *in_xbundle;
938 struct xport *in_port;
939 struct mac_entry *mac;
943 ctx->xout->has_normal = true;
945 memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
946 memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
947 wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
949 in_xbundle = lookup_input_bundle(ctx->xbridge, flow->in_port.ofp_port,
950 ctx->xin->packet != NULL, &in_port);
952 xlate_report(ctx, "no input bundle, dropping");
956 /* Drop malformed frames. */
957 if (flow->dl_type == htons(ETH_TYPE_VLAN) &&
958 !(flow->vlan_tci & htons(VLAN_CFI))) {
959 if (ctx->xin->packet != NULL) {
960 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
961 VLOG_WARN_RL(&rl, "bridge %s: dropping packet with partial "
962 "VLAN tag received on port %s",
963 ctx->xbridge->name, in_xbundle->name);
965 xlate_report(ctx, "partial VLAN tag, dropping");
969 /* Drop frames on bundles reserved for mirroring. */
970 if (xbundle_mirror_out(ctx->xbridge, in_xbundle)) {
971 if (ctx->xin->packet != NULL) {
972 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
973 VLOG_WARN_RL(&rl, "bridge %s: dropping packet received on port "
974 "%s, which is reserved exclusively for mirroring",
975 ctx->xbridge->name, in_xbundle->name);
977 xlate_report(ctx, "input port is mirror output port, dropping");
982 vid = vlan_tci_to_vid(flow->vlan_tci);
983 if (!input_vid_is_valid(vid, in_xbundle, ctx->xin->packet != NULL)) {
984 xlate_report(ctx, "disallowed VLAN VID for this input port, dropping");
987 vlan = input_vid_to_vlan(in_xbundle, vid);
989 /* Check other admissibility requirements. */
990 if (in_port && !is_admissible(ctx, in_port, vlan)) {
994 /* Learn source MAC. */
995 if (ctx->xin->may_learn) {
996 update_learning_table(ctx->xbridge, flow, wc, vlan, in_xbundle);
999 /* Determine output bundle. */
1000 ovs_rwlock_rdlock(&ctx->xbridge->ml->rwlock);
1001 mac = mac_learning_lookup(ctx->xbridge->ml, flow->dl_dst, vlan,
1004 struct xbundle *mac_xbundle = xbundle_lookup(mac->port.p);
1005 if (mac_xbundle && mac_xbundle != in_xbundle) {
1006 xlate_report(ctx, "forwarding to learned port");
1007 output_normal(ctx, mac_xbundle, vlan);
1008 } else if (!mac_xbundle) {
1009 xlate_report(ctx, "learned port is unknown, dropping");
1011 xlate_report(ctx, "learned port is input port, dropping");
1014 struct xbundle *xbundle;
1016 xlate_report(ctx, "no learned MAC for destination, flooding");
1017 LIST_FOR_EACH (xbundle, list_node, &ctx->xbridge->xbundles) {
1018 if (xbundle != in_xbundle
1019 && xbundle_includes_vlan(xbundle, vlan)
1020 && xbundle->floodable
1021 && !xbundle_mirror_out(ctx->xbridge, xbundle)) {
1022 output_normal(ctx, xbundle, vlan);
1025 ctx->xout->nf_output_iface = NF_OUT_FLOOD;
1027 ovs_rwlock_unlock(&ctx->xbridge->ml->rwlock);
1030 /* Compose SAMPLE action for sFlow or IPFIX. The given probability is
1031 * the number of packets out of UINT32_MAX to sample. The given
1032 * cookie is passed back in the callback for each sampled packet.
1035 compose_sample_action(const struct xbridge *xbridge,
1036 struct ofpbuf *odp_actions,
1037 const struct flow *flow,
1038 const uint32_t probability,
1039 const union user_action_cookie *cookie,
1040 const size_t cookie_size)
1042 size_t sample_offset, actions_offset;
1045 sample_offset = nl_msg_start_nested(odp_actions, OVS_ACTION_ATTR_SAMPLE);
1047 nl_msg_put_u32(odp_actions, OVS_SAMPLE_ATTR_PROBABILITY, probability);
1049 actions_offset = nl_msg_start_nested(odp_actions, OVS_SAMPLE_ATTR_ACTIONS);
1050 cookie_offset = put_userspace_action(xbridge->ofproto, odp_actions, flow,
1051 cookie, cookie_size);
1053 nl_msg_end_nested(odp_actions, actions_offset);
1054 nl_msg_end_nested(odp_actions, sample_offset);
1055 return cookie_offset;
1059 compose_sflow_cookie(const struct xbridge *xbridge, ovs_be16 vlan_tci,
1060 odp_port_t odp_port, unsigned int n_outputs,
1061 union user_action_cookie *cookie)
1065 cookie->type = USER_ACTION_COOKIE_SFLOW;
1066 cookie->sflow.vlan_tci = vlan_tci;
1068 /* See http://www.sflow.org/sflow_version_5.txt (search for "Input/output
1069 * port information") for the interpretation of cookie->output. */
1070 switch (n_outputs) {
1072 /* 0x40000000 | 256 means "packet dropped for unknown reason". */
1073 cookie->sflow.output = 0x40000000 | 256;
1077 ifindex = dpif_sflow_odp_port_to_ifindex(xbridge->sflow, odp_port);
1079 cookie->sflow.output = ifindex;
1084 /* 0x80000000 means "multiple output ports. */
1085 cookie->sflow.output = 0x80000000 | n_outputs;
1090 /* Compose SAMPLE action for sFlow bridge sampling. */
1092 compose_sflow_action(const struct xbridge *xbridge,
1093 struct ofpbuf *odp_actions,
1094 const struct flow *flow,
1095 odp_port_t odp_port)
1097 uint32_t probability;
1098 union user_action_cookie cookie;
1100 if (!xbridge->sflow || flow->in_port.ofp_port == OFPP_NONE) {
1104 probability = dpif_sflow_get_probability(xbridge->sflow);
1105 compose_sflow_cookie(xbridge, htons(0), odp_port,
1106 odp_port == ODPP_NONE ? 0 : 1, &cookie);
1108 return compose_sample_action(xbridge, odp_actions, flow, probability,
1109 &cookie, sizeof cookie.sflow);
1113 compose_flow_sample_cookie(uint16_t probability, uint32_t collector_set_id,
1114 uint32_t obs_domain_id, uint32_t obs_point_id,
1115 union user_action_cookie *cookie)
1117 cookie->type = USER_ACTION_COOKIE_FLOW_SAMPLE;
1118 cookie->flow_sample.probability = probability;
1119 cookie->flow_sample.collector_set_id = collector_set_id;
1120 cookie->flow_sample.obs_domain_id = obs_domain_id;
1121 cookie->flow_sample.obs_point_id = obs_point_id;
1125 compose_ipfix_cookie(union user_action_cookie *cookie)
1127 cookie->type = USER_ACTION_COOKIE_IPFIX;
1130 /* Compose SAMPLE action for IPFIX bridge sampling. */
1132 compose_ipfix_action(const struct xbridge *xbridge,
1133 struct ofpbuf *odp_actions,
1134 const struct flow *flow)
1136 uint32_t probability;
1137 union user_action_cookie cookie;
1139 if (!xbridge->ipfix || flow->in_port.ofp_port == OFPP_NONE) {
1143 probability = dpif_ipfix_get_bridge_exporter_probability(xbridge->ipfix);
1144 compose_ipfix_cookie(&cookie);
1146 compose_sample_action(xbridge, odp_actions, flow, probability,
1147 &cookie, sizeof cookie.ipfix);
1150 /* SAMPLE action for sFlow must be first action in any given list of
1151 * actions. At this point we do not have all information required to
1152 * build it. So try to build sample action as complete as possible. */
1154 add_sflow_action(struct xlate_ctx *ctx)
1156 ctx->user_cookie_offset = compose_sflow_action(ctx->xbridge,
1157 &ctx->xout->odp_actions,
1158 &ctx->xin->flow, ODPP_NONE);
1159 ctx->sflow_odp_port = 0;
1160 ctx->sflow_n_outputs = 0;
1163 /* SAMPLE action for IPFIX must be 1st or 2nd action in any given list
1164 * of actions, eventually after the SAMPLE action for sFlow. */
1166 add_ipfix_action(struct xlate_ctx *ctx)
1168 compose_ipfix_action(ctx->xbridge, &ctx->xout->odp_actions,
1172 /* Fix SAMPLE action according to data collected while composing ODP actions.
1173 * We need to fix SAMPLE actions OVS_SAMPLE_ATTR_ACTIONS attribute, i.e. nested
1174 * USERSPACE action's user-cookie which is required for sflow. */
1176 fix_sflow_action(struct xlate_ctx *ctx)
1178 const struct flow *base = &ctx->base_flow;
1179 union user_action_cookie *cookie;
1181 if (!ctx->user_cookie_offset) {
1185 cookie = ofpbuf_at(&ctx->xout->odp_actions, ctx->user_cookie_offset,
1186 sizeof cookie->sflow);
1187 ovs_assert(cookie->type == USER_ACTION_COOKIE_SFLOW);
1189 compose_sflow_cookie(ctx->xbridge, base->vlan_tci,
1190 ctx->sflow_odp_port, ctx->sflow_n_outputs, cookie);
1193 static enum slow_path_reason
1194 process_special(struct xlate_ctx *ctx, const struct flow *flow,
1195 const struct xport *xport, const struct ofpbuf *packet)
1197 struct flow_wildcards *wc = &ctx->xout->wc;
1198 const struct xbridge *xbridge = ctx->xbridge;
1202 } else if (xport->cfm && cfm_should_process_flow(xport->cfm, flow, wc)) {
1204 cfm_process_heartbeat(xport->cfm, packet);
1207 } else if (xport->bfd && bfd_should_process_flow(xport->bfd, flow, wc)) {
1209 bfd_process_packet(xport->bfd, flow, packet);
1212 } else if (xport->xbundle && xport->xbundle->lacp
1213 && flow->dl_type == htons(ETH_TYPE_LACP)) {
1215 lacp_process_packet(xport->xbundle->lacp, xport->ofport, packet);
1218 } else if (xbridge->has_stp && stp_should_process_flow(flow, wc)) {
1220 stp_process_packet(xport->ofport, packet);
1229 compose_output_action__(struct xlate_ctx *ctx, ofp_port_t ofp_port,
1232 const struct xport *xport = get_ofp_port(ctx->xbridge, ofp_port);
1233 struct flow_wildcards *wc = &ctx->xout->wc;
1234 struct flow *flow = &ctx->xin->flow;
1235 ovs_be16 flow_vlan_tci;
1236 uint32_t flow_skb_mark;
1237 uint8_t flow_nw_tos;
1238 odp_port_t out_port, odp_port;
1241 /* If 'struct flow' gets additional metadata, we'll need to zero it out
1242 * before traversing a patch port. */
1243 BUILD_ASSERT_DECL(FLOW_WC_SEQ == 20);
1246 xlate_report(ctx, "Nonexistent output port");
1248 } else if (xport->config & OFPUTIL_PC_NO_FWD) {
1249 xlate_report(ctx, "OFPPC_NO_FWD set, skipping output");
1251 } else if (check_stp && !stp_forward_in_state(xport->stp_state)) {
1252 xlate_report(ctx, "STP not in forwarding state, skipping output");
1256 if (mbridge_has_mirrors(ctx->xbridge->mbridge) && xport->xbundle) {
1257 ctx->xout->mirrors |= xbundle_mirror_dst(xport->xbundle->xbridge,
1262 const struct xport *peer = xport->peer;
1263 struct flow old_flow = ctx->xin->flow;
1264 enum slow_path_reason special;
1266 ctx->xbridge = peer->xbridge;
1267 flow->in_port.ofp_port = peer->ofp_port;
1268 flow->metadata = htonll(0);
1269 memset(&flow->tunnel, 0, sizeof flow->tunnel);
1270 memset(flow->regs, 0, sizeof flow->regs);
1272 special = process_special(ctx, &ctx->xin->flow, peer,
1275 ctx->xout->slow = special;
1276 } else if (may_receive(peer, ctx)) {
1277 if (stp_forward_in_state(peer->stp_state)) {
1278 xlate_table_action(ctx, flow->in_port.ofp_port, 0, true);
1280 /* Forwarding is disabled by STP. Let OFPP_NORMAL and the
1281 * learning action look at the packet, then drop it. */
1282 struct flow old_base_flow = ctx->base_flow;
1283 size_t old_size = ctx->xout->odp_actions.size;
1284 mirror_mask_t old_mirrors = ctx->xout->mirrors;
1285 xlate_table_action(ctx, flow->in_port.ofp_port, 0, true);
1286 ctx->xout->mirrors = old_mirrors;
1287 ctx->base_flow = old_base_flow;
1288 ctx->xout->odp_actions.size = old_size;
1292 ctx->xin->flow = old_flow;
1293 ctx->xbridge = xport->xbundle->xbridge;
1295 if (ctx->xin->resubmit_stats) {
1296 netdev_vport_inc_tx(xport->netdev, ctx->xin->resubmit_stats);
1297 netdev_vport_inc_rx(peer->netdev, ctx->xin->resubmit_stats);
1303 flow_vlan_tci = flow->vlan_tci;
1304 flow_skb_mark = flow->skb_mark;
1305 flow_nw_tos = flow->nw_tos;
1307 if (ofproto_dpif_dscp_from_priority(xport->ofport, flow->skb_priority,
1309 wc->masks.nw_tos |= IP_ECN_MASK;
1310 flow->nw_tos &= ~IP_DSCP_MASK;
1311 flow->nw_tos |= dscp;
1314 if (xport->is_tunnel) {
1315 /* Save tunnel metadata so that changes made due to
1316 * the Logical (tunnel) Port are not visible for any further
1317 * matches, while explicit set actions on tunnel metadata are.
1319 struct flow_tnl flow_tnl = flow->tunnel;
1320 odp_port = tnl_port_send(xport->ofport, flow, &ctx->xout->wc);
1321 if (odp_port == ODPP_NONE) {
1322 xlate_report(ctx, "Tunneling decided against output");
1323 goto out; /* restore flow_nw_tos */
1325 if (flow->tunnel.ip_dst == ctx->orig_tunnel_ip_dst) {
1326 xlate_report(ctx, "Not tunneling to our own address");
1327 goto out; /* restore flow_nw_tos */
1329 if (ctx->xin->resubmit_stats) {
1330 netdev_vport_inc_tx(xport->netdev, ctx->xin->resubmit_stats);
1332 out_port = odp_port;
1333 commit_odp_tunnel_action(flow, &ctx->base_flow,
1334 &ctx->xout->odp_actions);
1335 flow->tunnel = flow_tnl; /* Restore tunnel metadata */
1337 ofp_port_t vlandev_port;
1339 odp_port = xport->odp_port;
1340 if (ofproto_has_vlan_splinters(ctx->xbridge->ofproto)) {
1341 wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
1343 vlandev_port = vsp_realdev_to_vlandev(ctx->xbridge->ofproto, ofp_port,
1345 if (vlandev_port == ofp_port) {
1346 out_port = odp_port;
1348 out_port = ofp_port_to_odp_port(ctx->xbridge, vlandev_port);
1349 flow->vlan_tci = htons(0);
1351 flow->skb_mark &= ~IPSEC_MARK;
1354 if (out_port != ODPP_NONE) {
1355 commit_odp_actions(flow, &ctx->base_flow,
1356 &ctx->xout->odp_actions, &ctx->xout->wc);
1357 nl_msg_put_odp_port(&ctx->xout->odp_actions, OVS_ACTION_ATTR_OUTPUT,
1360 ctx->sflow_odp_port = odp_port;
1361 ctx->sflow_n_outputs++;
1362 ctx->xout->nf_output_iface = ofp_port;
1367 flow->vlan_tci = flow_vlan_tci;
1368 flow->skb_mark = flow_skb_mark;
1369 flow->nw_tos = flow_nw_tos;
1373 compose_output_action(struct xlate_ctx *ctx, ofp_port_t ofp_port)
1375 compose_output_action__(ctx, ofp_port, true);
1378 /* Common rule processing in one place to avoid duplicating code. */
1379 static struct rule_dpif *
1380 ctx_rule_hooks(struct xlate_ctx *ctx, struct rule_dpif *rule,
1383 if (ctx->xin->resubmit_hook) {
1384 ctx->xin->resubmit_hook(ctx->xin, rule, ctx->recurse);
1386 if (rule == NULL && may_packet_in) {
1388 * check if table configuration flags
1389 * OFPTC_TABLE_MISS_CONTROLLER, default.
1390 * OFPTC_TABLE_MISS_CONTINUE,
1391 * OFPTC_TABLE_MISS_DROP
1392 * When OF1.0, OFPTC_TABLE_MISS_CONTINUE is used. What to do?
1394 rule = rule_dpif_miss_rule(ctx->xbridge->ofproto, &ctx->xin->flow);
1396 if (rule && ctx->xin->resubmit_stats) {
1397 rule_credit_stats(rule, ctx->xin->resubmit_stats);
1403 xlate_table_action(struct xlate_ctx *ctx,
1404 ofp_port_t in_port, uint8_t table_id, bool may_packet_in)
1406 if (ctx->recurse < MAX_RESUBMIT_RECURSION) {
1407 struct rule_dpif *rule;
1408 ofp_port_t old_in_port = ctx->xin->flow.in_port.ofp_port;
1409 uint8_t old_table_id = ctx->table_id;
1411 ctx->table_id = table_id;
1413 /* Look up a flow with 'in_port' as the input port. */
1414 ctx->xin->flow.in_port.ofp_port = in_port;
1415 rule = rule_dpif_lookup_in_table(ctx->xbridge->ofproto,
1416 &ctx->xin->flow, &ctx->xout->wc,
1419 ctx->xout->tags |= calculate_flow_tag(ctx->xbridge->ofproto,
1420 &ctx->xin->flow, ctx->table_id,
1423 /* Restore the original input port. Otherwise OFPP_NORMAL and
1424 * OFPP_IN_PORT will have surprising behavior. */
1425 ctx->xin->flow.in_port.ofp_port = old_in_port;
1427 rule = ctx_rule_hooks(ctx, rule, may_packet_in);
1430 struct rule_dpif *old_rule = ctx->rule;
1434 do_xlate_actions(rule->up.ofpacts, rule->up.ofpacts_len, ctx);
1435 ctx->rule = old_rule;
1439 ctx->table_id = old_table_id;
1441 static struct vlog_rate_limit recurse_rl = VLOG_RATE_LIMIT_INIT(1, 1);
1443 VLOG_ERR_RL(&recurse_rl, "resubmit actions recursed over %d times",
1444 MAX_RESUBMIT_RECURSION);
1445 ctx->max_resubmit_trigger = true;
1450 xlate_ofpact_resubmit(struct xlate_ctx *ctx,
1451 const struct ofpact_resubmit *resubmit)
1456 in_port = resubmit->in_port;
1457 if (in_port == OFPP_IN_PORT) {
1458 in_port = ctx->xin->flow.in_port.ofp_port;
1461 table_id = resubmit->table_id;
1462 if (table_id == 255) {
1463 table_id = ctx->table_id;
1466 xlate_table_action(ctx, in_port, table_id, false);
1470 flood_packets(struct xlate_ctx *ctx, bool all)
1472 const struct xport *xport;
1474 HMAP_FOR_EACH (xport, ofp_node, &ctx->xbridge->xports) {
1475 if (xport->ofp_port == ctx->xin->flow.in_port.ofp_port) {
1480 compose_output_action__(ctx, xport->ofp_port, false);
1481 } else if (!(xport->config & OFPUTIL_PC_NO_FLOOD)) {
1482 compose_output_action(ctx, xport->ofp_port);
1486 ctx->xout->nf_output_iface = NF_OUT_FLOOD;
1490 execute_controller_action(struct xlate_ctx *ctx, int len,
1491 enum ofp_packet_in_reason reason,
1492 uint16_t controller_id)
1494 struct ofputil_packet_in pin;
1495 struct ofpbuf *packet;
1498 ovs_assert(!ctx->xout->slow || ctx->xout->slow == SLOW_CONTROLLER);
1499 ctx->xout->slow = SLOW_CONTROLLER;
1500 if (!ctx->xin->packet) {
1504 packet = ofpbuf_clone(ctx->xin->packet);
1506 key.skb_priority = 0;
1508 memset(&key.tunnel, 0, sizeof key.tunnel);
1510 commit_odp_actions(&ctx->xin->flow, &ctx->base_flow,
1511 &ctx->xout->odp_actions, &ctx->xout->wc);
1513 odp_execute_actions(NULL, packet, &key, ctx->xout->odp_actions.data,
1514 ctx->xout->odp_actions.size, NULL, NULL);
1516 pin.packet = packet->data;
1517 pin.packet_len = packet->size;
1518 pin.reason = reason;
1519 pin.controller_id = controller_id;
1520 pin.table_id = ctx->table_id;
1521 pin.cookie = ctx->rule ? ctx->rule->up.flow_cookie : 0;
1524 flow_get_metadata(&ctx->xin->flow, &pin.fmd);
1526 ofproto_dpif_send_packet_in(ctx->xbridge->ofproto, &pin);
1527 ofpbuf_delete(packet);
1531 compose_mpls_push_action(struct xlate_ctx *ctx, ovs_be16 eth_type)
1533 struct flow_wildcards *wc = &ctx->xout->wc;
1534 struct flow *flow = &ctx->xin->flow;
1536 ovs_assert(eth_type_mpls(eth_type));
1538 memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
1539 memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth);
1541 if (flow->mpls_depth) {
1542 flow->mpls_lse &= ~htonl(MPLS_BOS_MASK);
1548 if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
1549 label = htonl(0x2); /* IPV6 Explicit Null. */
1551 label = htonl(0x0); /* IPV4 Explicit Null. */
1553 wc->masks.nw_tos |= IP_DSCP_MASK;
1554 wc->masks.nw_ttl = 0xff;
1555 tc = (flow->nw_tos & IP_DSCP_MASK) >> 2;
1556 ttl = flow->nw_ttl ? flow->nw_ttl : 0x40;
1557 flow->mpls_lse = set_mpls_lse_values(ttl, tc, 1, label);
1558 flow->mpls_depth = 1;
1560 flow->dl_type = eth_type;
1564 compose_mpls_pop_action(struct xlate_ctx *ctx, ovs_be16 eth_type)
1566 struct flow_wildcards *wc = &ctx->xout->wc;
1567 struct flow *flow = &ctx->xin->flow;
1569 ovs_assert(eth_type_mpls(ctx->xin->flow.dl_type));
1570 ovs_assert(!eth_type_mpls(eth_type));
1572 memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
1573 memset(&wc->masks.mpls_depth, 0xff, sizeof wc->masks.mpls_depth);
1575 if (flow->mpls_depth) {
1577 flow->mpls_lse = htonl(0);
1578 if (!flow->mpls_depth) {
1579 flow->dl_type = eth_type;
1585 compose_dec_ttl(struct xlate_ctx *ctx, struct ofpact_cnt_ids *ids)
1587 struct flow *flow = &ctx->xin->flow;
1589 if (!is_ip_any(flow)) {
1593 ctx->xout->wc.masks.nw_ttl = 0xff;
1594 if (flow->nw_ttl > 1) {
1600 for (i = 0; i < ids->n_controllers; i++) {
1601 execute_controller_action(ctx, UINT16_MAX, OFPR_INVALID_TTL,
1605 /* Stop processing for current table. */
1611 compose_set_mpls_ttl_action(struct xlate_ctx *ctx, uint8_t ttl)
1613 if (!eth_type_mpls(ctx->xin->flow.dl_type)) {
1617 set_mpls_lse_ttl(&ctx->xin->flow.mpls_lse, ttl);
1622 compose_dec_mpls_ttl_action(struct xlate_ctx *ctx)
1624 struct flow *flow = &ctx->xin->flow;
1625 uint8_t ttl = mpls_lse_to_ttl(flow->mpls_lse);
1626 struct flow_wildcards *wc = &ctx->xout->wc;
1628 memset(&wc->masks.mpls_lse, 0xff, sizeof wc->masks.mpls_lse);
1630 if (!eth_type_mpls(flow->dl_type)) {
1636 set_mpls_lse_ttl(&flow->mpls_lse, ttl);
1639 execute_controller_action(ctx, UINT16_MAX, OFPR_INVALID_TTL, 0);
1641 /* Stop processing for current table. */
1647 xlate_output_action(struct xlate_ctx *ctx,
1648 ofp_port_t port, uint16_t max_len, bool may_packet_in)
1650 ofp_port_t prev_nf_output_iface = ctx->xout->nf_output_iface;
1652 ctx->xout->nf_output_iface = NF_OUT_DROP;
1656 compose_output_action(ctx, ctx->xin->flow.in_port.ofp_port);
1659 xlate_table_action(ctx, ctx->xin->flow.in_port.ofp_port,
1666 flood_packets(ctx, false);
1669 flood_packets(ctx, true);
1671 case OFPP_CONTROLLER:
1672 execute_controller_action(ctx, max_len, OFPR_ACTION, 0);
1678 if (port != ctx->xin->flow.in_port.ofp_port) {
1679 compose_output_action(ctx, port);
1681 xlate_report(ctx, "skipping output to input port");
1686 if (prev_nf_output_iface == NF_OUT_FLOOD) {
1687 ctx->xout->nf_output_iface = NF_OUT_FLOOD;
1688 } else if (ctx->xout->nf_output_iface == NF_OUT_DROP) {
1689 ctx->xout->nf_output_iface = prev_nf_output_iface;
1690 } else if (prev_nf_output_iface != NF_OUT_DROP &&
1691 ctx->xout->nf_output_iface != NF_OUT_FLOOD) {
1692 ctx->xout->nf_output_iface = NF_OUT_MULTI;
1697 xlate_output_reg_action(struct xlate_ctx *ctx,
1698 const struct ofpact_output_reg *or)
1700 uint64_t port = mf_get_subfield(&or->src, &ctx->xin->flow);
1701 if (port <= UINT16_MAX) {
1702 union mf_subvalue value;
1704 memset(&value, 0xff, sizeof value);
1705 mf_write_subfield_flow(&or->src, &value, &ctx->xout->wc.masks);
1706 xlate_output_action(ctx, u16_to_ofp(port),
1707 or->max_len, false);
1712 xlate_enqueue_action(struct xlate_ctx *ctx,
1713 const struct ofpact_enqueue *enqueue)
1715 ofp_port_t ofp_port = enqueue->port;
1716 uint32_t queue_id = enqueue->queue;
1717 uint32_t flow_priority, priority;
1720 /* Translate queue to priority. */
1721 error = ofproto_dpif_queue_to_priority(ctx->xbridge->ofproto, queue_id,
1724 /* Fall back to ordinary output action. */
1725 xlate_output_action(ctx, enqueue->port, 0, false);
1729 /* Check output port. */
1730 if (ofp_port == OFPP_IN_PORT) {
1731 ofp_port = ctx->xin->flow.in_port.ofp_port;
1732 } else if (ofp_port == ctx->xin->flow.in_port.ofp_port) {
1736 /* Add datapath actions. */
1737 flow_priority = ctx->xin->flow.skb_priority;
1738 ctx->xin->flow.skb_priority = priority;
1739 compose_output_action(ctx, ofp_port);
1740 ctx->xin->flow.skb_priority = flow_priority;
1742 /* Update NetFlow output port. */
1743 if (ctx->xout->nf_output_iface == NF_OUT_DROP) {
1744 ctx->xout->nf_output_iface = ofp_port;
1745 } else if (ctx->xout->nf_output_iface != NF_OUT_FLOOD) {
1746 ctx->xout->nf_output_iface = NF_OUT_MULTI;
1751 xlate_set_queue_action(struct xlate_ctx *ctx, uint32_t queue_id)
1753 uint32_t skb_priority;
1755 if (!ofproto_dpif_queue_to_priority(ctx->xbridge->ofproto, queue_id,
1757 ctx->xin->flow.skb_priority = skb_priority;
1759 /* Couldn't translate queue to a priority. Nothing to do. A warning
1760 * has already been logged. */
1765 slave_enabled_cb(ofp_port_t ofp_port, void *xbridge_)
1767 const struct xbridge *xbridge = xbridge_;
1778 case OFPP_CONTROLLER: /* Not supported by the bundle action. */
1781 port = get_ofp_port(xbridge, ofp_port);
1782 return port ? port->may_enable : false;
1787 xlate_bundle_action(struct xlate_ctx *ctx,
1788 const struct ofpact_bundle *bundle)
1792 port = bundle_execute(bundle, &ctx->xin->flow, &ctx->xout->wc,
1794 CONST_CAST(struct xbridge *, ctx->xbridge));
1795 if (bundle->dst.field) {
1796 nxm_reg_load(&bundle->dst, ofp_to_u16(port), &ctx->xin->flow);
1798 xlate_output_action(ctx, port, 0, false);
1803 xlate_learn_action(struct xlate_ctx *ctx,
1804 const struct ofpact_learn *learn)
1806 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1);
1807 struct ofputil_flow_mod fm;
1808 uint64_t ofpacts_stub[1024 / 8];
1809 struct ofpbuf ofpacts;
1812 ctx->xout->has_learn = true;
1814 learn_mask(learn, &ctx->xout->wc);
1816 if (!ctx->xin->may_learn) {
1820 ofpbuf_use_stack(&ofpacts, ofpacts_stub, sizeof ofpacts_stub);
1821 learn_execute(learn, &ctx->xin->flow, &fm, &ofpacts);
1823 error = ofproto_dpif_flow_mod(ctx->xbridge->ofproto, &fm);
1824 if (error && !VLOG_DROP_WARN(&rl)) {
1825 VLOG_WARN("learning action failed to modify flow table (%s)",
1826 ofperr_get_name(error));
1829 ofpbuf_uninit(&ofpacts);
1832 /* Reduces '*timeout' to no more than 'max'. A value of zero in either case
1833 * means "infinite". */
1835 reduce_timeout(uint16_t max, uint16_t *timeout)
1837 if (max && (!*timeout || *timeout > max)) {
1843 xlate_fin_timeout(struct xlate_ctx *ctx,
1844 const struct ofpact_fin_timeout *oft)
1846 if (ctx->xin->tcp_flags & (TCP_FIN | TCP_RST) && ctx->rule) {
1847 struct rule_dpif *rule = ctx->rule;
1849 if (list_is_empty(&rule->up.expirable)) {
1850 list_insert(&rule->up.ofproto->expirable, &rule->up.expirable);
1853 reduce_timeout(oft->fin_idle_timeout, &rule->up.idle_timeout);
1854 reduce_timeout(oft->fin_hard_timeout, &rule->up.hard_timeout);
1859 xlate_sample_action(struct xlate_ctx *ctx,
1860 const struct ofpact_sample *os)
1862 union user_action_cookie cookie;
1863 /* Scale the probability from 16-bit to 32-bit while representing
1864 * the same percentage. */
1865 uint32_t probability = (os->probability << 16) | os->probability;
1867 commit_odp_actions(&ctx->xin->flow, &ctx->base_flow,
1868 &ctx->xout->odp_actions, &ctx->xout->wc);
1870 compose_flow_sample_cookie(os->probability, os->collector_set_id,
1871 os->obs_domain_id, os->obs_point_id, &cookie);
1872 compose_sample_action(ctx->xbridge, &ctx->xout->odp_actions, &ctx->xin->flow,
1873 probability, &cookie, sizeof cookie.flow_sample);
1877 may_receive(const struct xport *xport, struct xlate_ctx *ctx)
1879 if (xport->config & (eth_addr_equals(ctx->xin->flow.dl_dst, eth_addr_stp)
1880 ? OFPUTIL_PC_NO_RECV_STP
1881 : OFPUTIL_PC_NO_RECV)) {
1885 /* Only drop packets here if both forwarding and learning are
1886 * disabled. If just learning is enabled, we need to have
1887 * OFPP_NORMAL and the learning action have a look at the packet
1888 * before we can drop it. */
1889 if (!stp_forward_in_state(xport->stp_state)
1890 && !stp_learn_in_state(xport->stp_state)) {
1898 tunnel_ecn_ok(struct xlate_ctx *ctx)
1900 if (is_ip_any(&ctx->base_flow)
1901 && (ctx->xin->flow.tunnel.ip_tos & IP_ECN_MASK) == IP_ECN_CE) {
1902 if ((ctx->base_flow.nw_tos & IP_ECN_MASK) == IP_ECN_NOT_ECT) {
1903 VLOG_WARN_RL(&rl, "dropping tunnel packet marked ECN CE"
1904 " but is not ECN capable");
1907 /* Set the ECN CE value in the tunneled packet. */
1908 ctx->xin->flow.nw_tos |= IP_ECN_CE;
1916 do_xlate_actions(const struct ofpact *ofpacts, size_t ofpacts_len,
1917 struct xlate_ctx *ctx)
1919 struct flow_wildcards *wc = &ctx->xout->wc;
1920 struct flow *flow = &ctx->xin->flow;
1921 bool was_evictable = true;
1922 const struct ofpact *a;
1925 /* Don't let the rule we're working on get evicted underneath us. */
1926 was_evictable = ctx->rule->up.evictable;
1927 ctx->rule->up.evictable = false;
1930 do_xlate_actions_again:
1931 OFPACT_FOR_EACH (a, ofpacts, ofpacts_len) {
1932 struct ofpact_controller *controller;
1933 const struct ofpact_metadata *metadata;
1941 xlate_output_action(ctx, ofpact_get_OUTPUT(a)->port,
1942 ofpact_get_OUTPUT(a)->max_len, true);
1945 case OFPACT_CONTROLLER:
1946 controller = ofpact_get_CONTROLLER(a);
1947 execute_controller_action(ctx, controller->max_len,
1949 controller->controller_id);
1952 case OFPACT_ENQUEUE:
1953 xlate_enqueue_action(ctx, ofpact_get_ENQUEUE(a));
1956 case OFPACT_SET_VLAN_VID:
1957 flow->vlan_tci &= ~htons(VLAN_VID_MASK);
1958 flow->vlan_tci |= (htons(ofpact_get_SET_VLAN_VID(a)->vlan_vid)
1962 case OFPACT_SET_VLAN_PCP:
1963 flow->vlan_tci &= ~htons(VLAN_PCP_MASK);
1965 htons((ofpact_get_SET_VLAN_PCP(a)->vlan_pcp << VLAN_PCP_SHIFT)
1969 case OFPACT_STRIP_VLAN:
1970 flow->vlan_tci = htons(0);
1973 case OFPACT_PUSH_VLAN:
1974 /* XXX 802.1AD(QinQ) */
1975 flow->vlan_tci = htons(VLAN_CFI);
1978 case OFPACT_SET_ETH_SRC:
1979 memcpy(flow->dl_src, ofpact_get_SET_ETH_SRC(a)->mac, ETH_ADDR_LEN);
1982 case OFPACT_SET_ETH_DST:
1983 memcpy(flow->dl_dst, ofpact_get_SET_ETH_DST(a)->mac, ETH_ADDR_LEN);
1986 case OFPACT_SET_IPV4_SRC:
1987 if (flow->dl_type == htons(ETH_TYPE_IP)) {
1988 flow->nw_src = ofpact_get_SET_IPV4_SRC(a)->ipv4;
1992 case OFPACT_SET_IPV4_DST:
1993 if (flow->dl_type == htons(ETH_TYPE_IP)) {
1994 flow->nw_dst = ofpact_get_SET_IPV4_DST(a)->ipv4;
1998 case OFPACT_SET_IPV4_DSCP:
1999 /* OpenFlow 1.0 only supports IPv4. */
2000 if (flow->dl_type == htons(ETH_TYPE_IP)) {
2001 flow->nw_tos &= ~IP_DSCP_MASK;
2002 flow->nw_tos |= ofpact_get_SET_IPV4_DSCP(a)->dscp;
2006 case OFPACT_SET_L4_SRC_PORT:
2007 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
2008 if (is_ip_any(flow)) {
2009 flow->tp_src = htons(ofpact_get_SET_L4_SRC_PORT(a)->port);
2013 case OFPACT_SET_L4_DST_PORT:
2014 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
2015 if (is_ip_any(flow)) {
2016 flow->tp_dst = htons(ofpact_get_SET_L4_DST_PORT(a)->port);
2020 case OFPACT_RESUBMIT:
2021 xlate_ofpact_resubmit(ctx, ofpact_get_RESUBMIT(a));
2024 case OFPACT_SET_TUNNEL:
2025 flow->tunnel.tun_id = htonll(ofpact_get_SET_TUNNEL(a)->tun_id);
2028 case OFPACT_SET_QUEUE:
2029 xlate_set_queue_action(ctx, ofpact_get_SET_QUEUE(a)->queue_id);
2032 case OFPACT_POP_QUEUE:
2033 flow->skb_priority = ctx->orig_skb_priority;
2036 case OFPACT_REG_MOVE:
2037 nxm_execute_reg_move(ofpact_get_REG_MOVE(a), flow, wc);
2040 case OFPACT_REG_LOAD:
2041 nxm_execute_reg_load(ofpact_get_REG_LOAD(a), flow);
2044 case OFPACT_STACK_PUSH:
2045 nxm_execute_stack_push(ofpact_get_STACK_PUSH(a), flow, wc,
2049 case OFPACT_STACK_POP:
2050 nxm_execute_stack_pop(ofpact_get_STACK_POP(a), flow, &ctx->stack);
2053 case OFPACT_PUSH_MPLS:
2054 compose_mpls_push_action(ctx, ofpact_get_PUSH_MPLS(a)->ethertype);
2057 case OFPACT_POP_MPLS:
2058 compose_mpls_pop_action(ctx, ofpact_get_POP_MPLS(a)->ethertype);
2061 case OFPACT_SET_MPLS_TTL:
2062 if (compose_set_mpls_ttl_action(ctx,
2063 ofpact_get_SET_MPLS_TTL(a)->ttl)) {
2068 case OFPACT_DEC_MPLS_TTL:
2069 if (compose_dec_mpls_ttl_action(ctx)) {
2074 case OFPACT_DEC_TTL:
2075 if (compose_dec_ttl(ctx, ofpact_get_DEC_TTL(a))) {
2081 /* Nothing to do. */
2084 case OFPACT_MULTIPATH:
2085 multipath_execute(ofpact_get_MULTIPATH(a), flow, wc);
2089 xlate_bundle_action(ctx, ofpact_get_BUNDLE(a));
2092 case OFPACT_OUTPUT_REG:
2093 xlate_output_reg_action(ctx, ofpact_get_OUTPUT_REG(a));
2097 xlate_learn_action(ctx, ofpact_get_LEARN(a));
2104 case OFPACT_FIN_TIMEOUT:
2105 memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
2106 ctx->xout->has_fin_timeout = true;
2107 xlate_fin_timeout(ctx, ofpact_get_FIN_TIMEOUT(a));
2110 case OFPACT_CLEAR_ACTIONS:
2112 * Nothing to do because writa-actions is not supported for now.
2113 * When writa-actions is supported, clear-actions also must
2114 * be supported at the same time.
2118 case OFPACT_WRITE_METADATA:
2119 metadata = ofpact_get_WRITE_METADATA(a);
2120 flow->metadata &= ~metadata->mask;
2121 flow->metadata |= metadata->metadata & metadata->mask;
2125 /* Not implemented yet. */
2128 case OFPACT_GOTO_TABLE: {
2129 /* It is assumed that goto-table is the last action. */
2130 struct ofpact_goto_table *ogt = ofpact_get_GOTO_TABLE(a);
2131 struct rule_dpif *rule;
2133 ovs_assert(ctx->table_id < ogt->table_id);
2135 ctx->table_id = ogt->table_id;
2137 /* Look up a flow from the new table. */
2138 rule = rule_dpif_lookup_in_table(ctx->xbridge->ofproto, flow, wc,
2141 ctx->xout->tags |= calculate_flow_tag(ctx->xbridge->ofproto,
2143 ctx->table_id, rule);
2145 rule = ctx_rule_hooks(ctx, rule, true);
2149 ctx->rule->up.evictable = was_evictable;
2152 was_evictable = rule->up.evictable;
2153 rule->up.evictable = false;
2155 /* Tail recursion removal. */
2156 ofpacts = rule->up.ofpacts;
2157 ofpacts_len = rule->up.ofpacts_len;
2158 goto do_xlate_actions_again;
2164 xlate_sample_action(ctx, ofpact_get_SAMPLE(a));
2171 ctx->rule->up.evictable = was_evictable;
2176 xlate_in_init(struct xlate_in *xin, struct ofproto_dpif *ofproto,
2177 const struct flow *flow, struct rule_dpif *rule,
2178 uint8_t tcp_flags, const struct ofpbuf *packet)
2180 xin->ofproto = ofproto;
2182 xin->packet = packet;
2183 xin->may_learn = packet != NULL;
2185 xin->ofpacts = NULL;
2186 xin->ofpacts_len = 0;
2187 xin->tcp_flags = tcp_flags;
2188 xin->resubmit_hook = NULL;
2189 xin->report_hook = NULL;
2190 xin->resubmit_stats = NULL;
2194 xlate_out_uninit(struct xlate_out *xout)
2197 ofpbuf_uninit(&xout->odp_actions);
2201 /* Translates the 'ofpacts_len' bytes of "struct ofpact"s starting at 'ofpacts'
2202 * into datapath actions, using 'ctx', and discards the datapath actions. */
2204 xlate_actions_for_side_effects(struct xlate_in *xin)
2206 struct xlate_out xout;
2208 xlate_actions(xin, &xout);
2209 xlate_out_uninit(&xout);
2213 xlate_report(struct xlate_ctx *ctx, const char *s)
2215 if (ctx->xin->report_hook) {
2216 ctx->xin->report_hook(ctx->xin, s, ctx->recurse);
2221 xlate_out_copy(struct xlate_out *dst, const struct xlate_out *src)
2224 dst->tags = src->tags;
2225 dst->slow = src->slow;
2226 dst->has_learn = src->has_learn;
2227 dst->has_normal = src->has_normal;
2228 dst->has_fin_timeout = src->has_fin_timeout;
2229 dst->nf_output_iface = src->nf_output_iface;
2230 dst->mirrors = src->mirrors;
2232 ofpbuf_use_stub(&dst->odp_actions, dst->odp_actions_stub,
2233 sizeof dst->odp_actions_stub);
2234 ofpbuf_put(&dst->odp_actions, src->odp_actions.data,
2235 src->odp_actions.size);
2239 actions_output_to_local_port(const struct xlate_ctx *ctx)
2241 odp_port_t local_odp_port = ofp_port_to_odp_port(ctx->xbridge, OFPP_LOCAL);
2242 const struct nlattr *a;
2245 NL_ATTR_FOR_EACH_UNSAFE (a, left, ctx->xout->odp_actions.data,
2246 ctx->xout->odp_actions.size) {
2247 if (nl_attr_type(a) == OVS_ACTION_ATTR_OUTPUT
2248 && nl_attr_get_odp_port(a) == local_odp_port) {
2255 /* Translates the 'ofpacts_len' bytes of "struct ofpacts" starting at 'ofpacts'
2256 * into datapath actions in 'odp_actions', using 'ctx'. */
2258 xlate_actions(struct xlate_in *xin, struct xlate_out *xout)
2260 /* Normally false. Set to true if we ever hit MAX_RESUBMIT_RECURSION, so
2261 * that in the future we always keep a copy of the original flow for
2262 * tracing purposes. */
2263 static bool hit_resubmit_limit;
2265 struct flow_wildcards *wc = &xout->wc;
2266 struct flow *flow = &xin->flow;
2268 enum slow_path_reason special;
2269 const struct ofpact *ofpacts;
2270 struct xport *in_port;
2271 struct flow orig_flow;
2272 struct xlate_ctx ctx;
2275 COVERAGE_INC(xlate_actions);
2277 /* Flow initialization rules:
2278 * - 'base_flow' must match the kernel's view of the packet at the
2279 * time that action processing starts. 'flow' represents any
2280 * transformations we wish to make through actions.
2281 * - By default 'base_flow' and 'flow' are the same since the input
2282 * packet matches the output before any actions are applied.
2283 * - When using VLAN splinters, 'base_flow''s VLAN is set to the value
2284 * of the received packet as seen by the kernel. If we later output
2285 * to another device without any modifications this will cause us to
2286 * insert a new tag since the original one was stripped off by the
2288 * - Tunnel metadata as received is retained in 'flow'. This allows
2289 * tunnel metadata matching also in later tables.
2290 * Since a kernel action for setting the tunnel metadata will only be
2291 * generated with actual tunnel output, changing the tunnel metadata
2292 * values in 'flow' (such as tun_id) will only have effect with a later
2293 * tunnel output action.
2294 * - Tunnel 'base_flow' is completely cleared since that is what the
2295 * kernel does. If we wish to maintain the original values an action
2296 * needs to be generated. */
2302 ctx.xout->has_learn = false;
2303 ctx.xout->has_normal = false;
2304 ctx.xout->has_fin_timeout = false;
2305 ctx.xout->nf_output_iface = NF_OUT_DROP;
2306 ctx.xout->mirrors = 0;
2307 ofpbuf_use_stub(&ctx.xout->odp_actions, ctx.xout->odp_actions_stub,
2308 sizeof ctx.xout->odp_actions_stub);
2309 ofpbuf_reserve(&ctx.xout->odp_actions, NL_A_U32_SIZE);
2311 ctx.xbridge = xbridge_lookup(xin->ofproto);
2316 ctx.rule = xin->rule;
2318 ctx.base_flow = *flow;
2319 memset(&ctx.base_flow.tunnel, 0, sizeof ctx.base_flow.tunnel);
2320 ctx.orig_tunnel_ip_dst = flow->tunnel.ip_dst;
2322 flow_wildcards_init_catchall(wc);
2323 memset(&wc->masks.in_port, 0xff, sizeof wc->masks.in_port);
2324 memset(&wc->masks.skb_priority, 0xff, sizeof wc->masks.skb_priority);
2325 memset(&wc->masks.dl_type, 0xff, sizeof wc->masks.dl_type);
2326 wc->masks.nw_frag |= FLOW_NW_FRAG_MASK;
2328 if (tnl_port_should_receive(&ctx.xin->flow)) {
2329 memset(&wc->masks.tunnel, 0xff, sizeof wc->masks.tunnel);
2331 if (ctx.xbridge->has_netflow) {
2332 netflow_mask_wc(flow, wc);
2336 ctx.max_resubmit_trigger = false;
2337 ctx.orig_skb_priority = flow->skb_priority;
2342 ofpacts = xin->ofpacts;
2343 ofpacts_len = xin->ofpacts_len;
2344 } else if (xin->rule) {
2345 ofpacts = xin->rule->up.ofpacts;
2346 ofpacts_len = xin->rule->up.ofpacts_len;
2351 ofpbuf_use_stub(&ctx.stack, ctx.init_stack, sizeof ctx.init_stack);
2353 if (mbridge_has_mirrors(ctx.xbridge->mbridge) || hit_resubmit_limit) {
2354 /* Do this conditionally because the copy is expensive enough that it
2355 * shows up in profiles. */
2359 if (flow->nw_frag & FLOW_NW_FRAG_ANY) {
2360 switch (ctx.xbridge->frag) {
2361 case OFPC_FRAG_NORMAL:
2362 /* We must pretend that transport ports are unavailable. */
2363 flow->tp_src = ctx.base_flow.tp_src = htons(0);
2364 flow->tp_dst = ctx.base_flow.tp_dst = htons(0);
2367 case OFPC_FRAG_DROP:
2370 case OFPC_FRAG_REASM:
2373 case OFPC_FRAG_NX_MATCH:
2374 /* Nothing to do. */
2377 case OFPC_INVALID_TTL_TO_CONTROLLER:
2382 in_port = get_ofp_port(ctx.xbridge, flow->in_port.ofp_port);
2383 special = process_special(&ctx, flow, in_port, ctx.xin->packet);
2385 ctx.xout->slow = special;
2387 static struct vlog_rate_limit trace_rl = VLOG_RATE_LIMIT_INIT(1, 1);
2388 size_t sample_actions_len;
2390 if (flow->in_port.ofp_port
2391 != vsp_realdev_to_vlandev(ctx.xbridge->ofproto,
2392 flow->in_port.ofp_port,
2394 ctx.base_flow.vlan_tci = 0;
2397 add_sflow_action(&ctx);
2398 add_ipfix_action(&ctx);
2399 sample_actions_len = ctx.xout->odp_actions.size;
2401 if (tunnel_ecn_ok(&ctx) && (!in_port || may_receive(in_port, &ctx))) {
2402 do_xlate_actions(ofpacts, ofpacts_len, &ctx);
2404 /* We've let OFPP_NORMAL and the learning action look at the
2405 * packet, so drop it now if forwarding is disabled. */
2406 if (in_port && !stp_forward_in_state(in_port->stp_state)) {
2407 ctx.xout->odp_actions.size = sample_actions_len;
2411 if (ctx.max_resubmit_trigger && !ctx.xin->resubmit_hook) {
2412 if (!hit_resubmit_limit) {
2413 /* We didn't record the original flow. Make sure we do from
2415 hit_resubmit_limit = true;
2416 } else if (!VLOG_DROP_ERR(&trace_rl)) {
2417 struct ds ds = DS_EMPTY_INITIALIZER;
2419 ofproto_trace(ctx.xbridge->ofproto, &orig_flow,
2420 ctx.xin->packet, &ds);
2421 VLOG_ERR("Trace triggered by excessive resubmit "
2422 "recursion:\n%s", ds_cstr(&ds));
2427 if (ctx.xbridge->has_in_band
2428 && in_band_must_output_to_local_port(flow)
2429 && !actions_output_to_local_port(&ctx)) {
2430 compose_output_action(&ctx, OFPP_LOCAL);
2433 fix_sflow_action(&ctx);
2435 if (mbridge_has_mirrors(ctx.xbridge->mbridge)) {
2436 add_mirror_actions(&ctx, &orig_flow);
2440 ofpbuf_uninit(&ctx.stack);
2442 /* Clear the metadata and register wildcard masks, because we won't
2443 * use non-header fields as part of the cache. */
2444 memset(&wc->masks.metadata, 0, sizeof wc->masks.metadata);
2445 memset(&wc->masks.regs, 0, sizeof wc->masks.regs);