ovn-controller: Update check for parent port.

[ovs.git] / ovn / controller / physical.c

/* Copyright (c) 2015 Nicira, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <config.h>
#include "physical.h"
#include "lflow.h"
#include "match.h"
#include "ofctrl.h"
#include "ofp-actions.h"
#include "ofpbuf.h"
#include "ovn-controller.h"
#include "ovn/lib/ovn-sb-idl.h"
#include "openvswitch/vlog.h"
#include "shash.h"
#include "simap.h"
#include "smap.h"
#include "sset.h"
#include "vswitch-idl.h"

VLOG_DEFINE_THIS_MODULE(physical);

void
physical_register_ovs_idl(struct ovsdb_idl *ovs_idl)
{
    ovsdb_idl_add_table(ovs_idl, &ovsrec_table_bridge);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_bridge_col_ports);

    ovsdb_idl_add_table(ovs_idl, &ovsrec_table_port);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_port_col_name);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_port_col_interfaces);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_port_col_external_ids);

    ovsdb_idl_add_table(ovs_idl, &ovsrec_table_interface);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_interface_col_name);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_interface_col_ofport);
    ovsdb_idl_add_column(ovs_idl, &ovsrec_interface_col_external_ids);
}

/* Maps from a chassis to the OpenFlow port number of the tunnel that can be
 * used to reach that chassis. */
struct chassis_tunnel {
    struct hmap_node hmap_node;
    const char *chassis_id;
    ofp_port_t ofport;
    enum chassis_tunnel_type type;
};

static struct chassis_tunnel *
chassis_tunnel_find(struct hmap *tunnels, const char *chassis_id)
{
    struct chassis_tunnel *tun;
    HMAP_FOR_EACH_WITH_HASH (tun, hmap_node, hash_string(chassis_id, 0),
                             tunnels) {
        if (!strcmp(tun->chassis_id, chassis_id)) {
            return tun;
        }
    }
    return NULL;
}

static void
put_load(uint64_t value, enum mf_field_id dst, int ofs, int n_bits,
         struct ofpbuf *ofpacts)
{
    struct ofpact_set_field *sf = ofpact_put_SET_FIELD(ofpacts);
    sf->field = mf_from_id(dst);
    sf->flow_has_vlan = false;

    ovs_be64 n_value = htonll(value);
    bitwise_copy(&n_value, 8, 0, &sf->value, sf->field->n_bytes, ofs, n_bits);
    bitwise_one(&sf->mask, sf->field->n_bytes, ofs, n_bits);
}

static void
put_move(enum mf_field_id src, int src_ofs,
         enum mf_field_id dst, int dst_ofs,
         int n_bits,
         struct ofpbuf *ofpacts)
{
    struct ofpact_reg_move *move = ofpact_put_REG_MOVE(ofpacts);
    move->src.field = mf_from_id(src);
    move->src.ofs = src_ofs;
    move->src.n_bits = n_bits;
    move->dst.field = mf_from_id(dst);
    move->dst.ofs = dst_ofs;
    move->dst.n_bits = n_bits;
}

static void
put_resubmit(uint8_t table_id, struct ofpbuf *ofpacts)
{
    struct ofpact_resubmit *resubmit = ofpact_put_RESUBMIT(ofpacts);
    resubmit->in_port = OFPP_IN_PORT;
    resubmit->table_id = table_id;
}

static void
put_encapsulation(enum mf_field_id mff_ovn_geneve,
                  const struct chassis_tunnel *tun,
                  const struct sbrec_datapath_binding *datapath,
                  uint16_t outport, struct ofpbuf *ofpacts)
{
    if (tun->type == GENEVE) {
        put_load(datapath->tunnel_key, MFF_TUN_ID, 0, 24, ofpacts);
        put_load(outport, mff_ovn_geneve, 0, 32, ofpacts);
        put_move(MFF_LOG_INPORT, 0, mff_ovn_geneve, 16, 15, ofpacts);
    } else if (tun->type == STT) {
        put_load(datapath->tunnel_key | (outport << 24), MFF_TUN_ID, 0, 64,
                 ofpacts);
        put_move(MFF_LOG_INPORT, 0, MFF_TUN_ID, 40, 15, ofpacts);
    } else if (tun->type == VXLAN) {
        put_load(datapath->tunnel_key, MFF_TUN_ID, 0, 24, ofpacts);
    } else {
        OVS_NOT_REACHED();
    }
}

static void
put_stack(enum mf_field_id field, struct ofpact_stack *stack)
{
    stack->subfield.field = mf_from_id(field);
    stack->subfield.ofs = 0;
    stack->subfield.n_bits = stack->subfield.field->n_bits;
}

void
physical_run(struct controller_ctx *ctx, enum mf_field_id mff_ovn_geneve,
             const struct ovsrec_bridge *br_int, const char *this_chassis_id,
             const struct simap *ct_zones, struct hmap *flow_table)
{
    struct simap localvif_to_ofport = SIMAP_INITIALIZER(&localvif_to_ofport);
    struct hmap tunnels = HMAP_INITIALIZER(&tunnels);
    struct simap localnet_to_ofport = SIMAP_INITIALIZER(&localnet_to_ofport);

    for (int i = 0; i < br_int->n_ports; i++) {
        const struct ovsrec_port *port_rec = br_int->ports[i];
        if (!strcmp(port_rec->name, br_int->name)) {
            continue;
        }

        const char *chassis_id = smap_get(&port_rec->external_ids,
                                          "ovn-chassis-id");
        if (chassis_id && !strcmp(chassis_id, this_chassis_id)) {
            continue;
        }

        const char *localnet = smap_get(&port_rec->external_ids,
                                        "ovn-localnet-port");
        const char *logpatch = smap_get(&port_rec->external_ids,
                                        "ovn-logical-patch-port");

        for (int j = 0; j < port_rec->n_interfaces; j++) {
            const struct ovsrec_interface *iface_rec = port_rec->interfaces[j];

            /* Get OpenFlow port number. */
            if (!iface_rec->n_ofport) {
                continue;
            }
            int64_t ofport = iface_rec->ofport[0];
            if (ofport < 1 || ofport > ofp_to_u16(OFPP_MAX)) {
                continue;
            }

            /* Record as patch to local net, logical patch port, chassis, or
             * local logical port. */
            bool is_patch = !strcmp(iface_rec->type, "patch");
            if (is_patch && localnet) {
                simap_put(&localnet_to_ofport, localnet, ofport);
                break;
            } else if (is_patch && logpatch) {
                /* Logical patch ports can be handled just like VIFs. */
                simap_put(&localvif_to_ofport, logpatch, ofport);
                break;
            } else if (chassis_id) {
                enum chassis_tunnel_type tunnel_type;
                if (!strcmp(iface_rec->type, "geneve")) {
                    tunnel_type = GENEVE;
                    if (!mff_ovn_geneve) {
                        continue;
                    }
                } else if (!strcmp(iface_rec->type, "stt")) {
                    tunnel_type = STT;
                } else if (!strcmp(iface_rec->type, "vxlan")) {
                    tunnel_type = VXLAN;
                } else {
                    continue;
                }

                struct chassis_tunnel *tun = xmalloc(sizeof *tun);
                hmap_insert(&tunnels, &tun->hmap_node,
                            hash_string(chassis_id, 0));
                tun->chassis_id = chassis_id;
                tun->ofport = u16_to_ofp(ofport);
                tun->type = tunnel_type;
                break;
            } else {
                const char *iface_id = smap_get(&iface_rec->external_ids,
                                                "iface-id");
                if (iface_id) {
                    simap_put(&localvif_to_ofport, iface_id, ofport);
                }
            }
        }
    }

    struct ofpbuf ofpacts;
    ofpbuf_init(&ofpacts, 0);

    struct binding_elem {
        struct ovs_list list_elem;
        const struct sbrec_port_binding *binding;
    };
    /* The bindings for a given VLAN on a localnet port. */
    struct localnet_vlan {
        struct hmap_node node;
        int tag;
        struct ovs_list bindings;
    };
    /* A hash of localnet_vlans, hashed on VLAN ID, for a localnet port */
    struct localnet_bindings {
        ofp_port_t ofport;
        struct hmap vlans;
    };
    /* Maps from network name to "struct localnet_bindings". */
    struct shash localnet_inputs = SHASH_INITIALIZER(&localnet_inputs);

    /* Contains bare "struct hmap_node"s whose hash values are the tunnel_key
     * of datapaths with at least one local port binding. */
    struct hmap local_datapaths = HMAP_INITIALIZER(&local_datapaths);

    /* Set up flows in table 0 for physical-to-logical translation and in table
     * 64 for logical-to-physical translation. */
    const struct sbrec_port_binding *binding;
    SBREC_PORT_BINDING_FOR_EACH (binding, ctx->ovnsb_idl) {
        /* Find the OpenFlow port for the logical port, as 'ofport'.  This is
         * one of:
         *
         *     - If the port is a VIF on the chassis we're managing, the
         *       OpenFlow port for the VIF.  'tun' will be NULL.
         *
         *       In this or the next case, for a container nested inside a VM
         *       and accessible via a VLAN, 'tag' is the VLAN ID; otherwise
         *       'tag' is 0.
         *
         *       The same logic handles logical patch ports.
         *
         *     - If the port is on a remote chassis, the OpenFlow port for a
         *       tunnel to the VIF's remote chassis.  'tun' identifies that
         *       tunnel.
         *
         *     - If the port is a "localnet" port for a network that is
         *       attached to the chassis we're managing, the OpenFlow port for
         *       the localnet port (a patch port).
         *
         *       The "localnet" port may be configured with a VLAN ID.  If so,
         *       'tag' will be set to that VLAN ID; otherwise 'tag' is 0.
         */

        int tag = 0;
        ofp_port_t ofport;
        if (!strcmp(binding->type, "localnet")) {
            const char *network = smap_get(&binding->options, "network_name");
            if (!network) {
                continue;
            }
            ofport = u16_to_ofp(simap_get(&localnet_to_ofport, network));
            if (ofport && binding->tag) {
                tag = *binding->tag;
            }
        } else if (binding->parent_port && *binding->parent_port) {
            if (!binding->tag) {
                continue;
            }
            ofport = u16_to_ofp(simap_get(&localvif_to_ofport,
                                          binding->parent_port));
            if (ofport) {
                tag = *binding->tag;
            }
        } else {
            ofport = u16_to_ofp(simap_get(&localvif_to_ofport,
                                          binding->logical_port));
        }

        const struct chassis_tunnel *tun = NULL;
        if (!ofport) {
            if (!binding->chassis) {
                continue;
            }
            tun = chassis_tunnel_find(&tunnels, binding->chassis->name);
            if (!tun) {
                continue;
            }
            ofport = tun->ofport;
        }

        struct match match;
        if (!tun) {
            int zone_id = simap_get(ct_zones, binding->logical_port);
            /* Packets that arrive from a vif can belong to a VM or
             * to a container located inside that VM. Packets that
             * arrive from containers have a tag (vlan) associated with them.
             */

            /* Table 0, Priority 150 and 100.
             * ==============================
             *
             * Priority 150 is for tagged traffic. This may be containers in a
             * VM or a VLAN on a local network. For such traffic, match on the
             * tags and then strip the tag.
             *
             * Priority 100 is for traffic belonging to VMs or untagged locally
             * connected networks.
             *
             * For both types of traffic: set MFF_LOG_INPORT to the logical
             * input port, MFF_LOG_DATAPATH to the logical datapath, and
             * resubmit into the logical ingress pipeline starting at table
             * 16. */
            if (!strcmp(binding->type, "localnet")) {
                /* The same OpenFlow port may correspond to localnet ports
                 * attached to more than one logical datapath, so keep track of
                 * all associated bindings and add a flow at the end. */

                const char *network
                    = smap_get(&binding->options, "network_name");
                struct localnet_bindings *ln_bindings;
                struct hmap_node *node;
                struct localnet_vlan *ln_vlan;

                ln_bindings = shash_find_data(&localnet_inputs, network);
                if (!ln_bindings) {
                    ln_bindings = xmalloc(sizeof *ln_bindings);
                    ln_bindings->ofport = ofport;
                    hmap_init(&ln_bindings->vlans);
                    shash_add(&localnet_inputs, network, ln_bindings);
                }
                node = hmap_first_with_hash(&ln_bindings->vlans, tag);
                if (node) {
                    ASSIGN_CONTAINER(ln_vlan, node, node);
                } else {
                    ln_vlan = xmalloc(sizeof *ln_vlan);
                    ln_vlan->tag = tag;
                    list_init(&ln_vlan->bindings);
                    hmap_insert(&ln_bindings->vlans, &ln_vlan->node, tag);
                }

                struct binding_elem *b = xmalloc(sizeof *b);
                b->binding = binding;
                list_insert(&ln_vlan->bindings, &b->list_elem);
            } else {
                struct hmap_node *ld;
                ld = hmap_first_with_hash(&local_datapaths,
                                          binding->datapath->tunnel_key);
                if (!ld) {
                    ld = xmalloc(sizeof *ld);
                    hmap_insert(&local_datapaths, ld,
                                binding->datapath->tunnel_key);
                }

                ofpbuf_clear(&ofpacts);
                match_init_catchall(&match);
                match_set_in_port(&match, ofport);
                if (tag) {
                    match_set_dl_vlan(&match, htons(tag));
                }

                if (zone_id) {
                    put_load(zone_id, MFF_LOG_CT_ZONE, 0, 32, &ofpacts);
                }

                /* Set MFF_LOG_DATAPATH and MFF_LOG_INPORT. */
                put_load(binding->datapath->tunnel_key, MFF_LOG_DATAPATH, 0, 64,
                         &ofpacts);
                put_load(binding->tunnel_key, MFF_LOG_INPORT, 0, 32,
                         &ofpacts);

                /* Strip vlans. */
                if (tag) {
                    ofpact_put_STRIP_VLAN(&ofpacts);
                }

                /* Resubmit to first logical ingress pipeline table. */
                put_resubmit(OFTABLE_LOG_INGRESS_PIPELINE, &ofpacts);
                ofctrl_add_flow(flow_table, OFTABLE_PHY_TO_LOG,
                                tag ? 150 : 100, &match, &ofpacts);
            }

            /* Table 33, priority 100.
             * =======================
             *
             * Implements output to local hypervisor.  Each flow matches a
             * logical output port on the local hypervisor, and resubmits to
             * table 34.
             */

            match_init_catchall(&match);
            ofpbuf_clear(&ofpacts);

            /* Match MFF_LOG_DATAPATH, MFF_LOG_OUTPORT. */
            match_set_metadata(&match, htonll(binding->datapath->tunnel_key));
            match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0,
                          binding->tunnel_key);

            if (zone_id) {
                put_load(zone_id, MFF_LOG_CT_ZONE, 0, 32, &ofpacts);
            }

            /* Resubmit to table 34. */
            put_resubmit(OFTABLE_DROP_LOOPBACK, &ofpacts);
            ofctrl_add_flow(flow_table, OFTABLE_LOCAL_OUTPUT, 100, &match,
                            &ofpacts);

            /* Table 64, Priority 100.
             * =======================
             *
             * Deliver the packet to the local vif. */
            match_init_catchall(&match);
            ofpbuf_clear(&ofpacts);
            match_set_metadata(&match, htonll(binding->datapath->tunnel_key));
            match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0,
                          binding->tunnel_key);
            if (tag) {
                /* For containers sitting behind a local vif, tag the packets
                 * before delivering them. */
                struct ofpact_vlan_vid *vlan_vid;
                vlan_vid = ofpact_put_SET_VLAN_VID(&ofpacts);
                vlan_vid->vlan_vid = tag;
                vlan_vid->push_vlan_if_needed = true;

                /* A packet might need to hair-pin back into its ingress
                 * OpenFlow port (to a different logical port, which we already
                 * checked back in table 34), so set the in_port to zero. */
                put_stack(MFF_IN_PORT, ofpact_put_STACK_PUSH(&ofpacts));
                put_load(0, MFF_IN_PORT, 0, 16, &ofpacts);
            }
            ofpact_put_OUTPUT(&ofpacts)->port = ofport;
            if (tag) {
                /* Revert the tag added to the packets headed to containers
                 * in the previous step. If we don't do this, the packets
                 * that are to be broadcasted to a VM in the same logical
                 * switch will also contain the tag. Also revert the zero'd
                 * in_port. */
                ofpact_put_STRIP_VLAN(&ofpacts);
                put_stack(MFF_IN_PORT, ofpact_put_STACK_POP(&ofpacts));
            }
            ofctrl_add_flow(flow_table, OFTABLE_LOG_TO_PHY, 100,
                            &match, &ofpacts);
        } else {
            /* Table 32, priority 100.
             * =======================
             *
             * Implements output to remote hypervisors.  Each flow matches an
             * output port that includes a logical port on a remote hypervisor,
             * and tunnels the packet to that hypervisor.
             */

            match_init_catchall(&match);
            ofpbuf_clear(&ofpacts);

            /* Match MFF_LOG_DATAPATH, MFF_LOG_OUTPORT. */
            match_set_metadata(&match, htonll(binding->datapath->tunnel_key));
            match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0,
                          binding->tunnel_key);

            put_encapsulation(mff_ovn_geneve, tun, binding->datapath,
                              binding->tunnel_key, &ofpacts);

            /* Output to tunnel. */
            ofpact_put_OUTPUT(&ofpacts)->port = ofport;
            ofctrl_add_flow(flow_table, OFTABLE_REMOTE_OUTPUT, 100,
                            &match, &ofpacts);
        }

        /* Table 34, Priority 100.
         * =======================
         *
         * Drop packets whose logical inport and outport are the same. */
        match_init_catchall(&match);
        ofpbuf_clear(&ofpacts);
        match_set_metadata(&match, htonll(binding->datapath->tunnel_key));
        match_set_reg(&match, MFF_LOG_INPORT - MFF_REG0, binding->tunnel_key);
        match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0, binding->tunnel_key);
        ofctrl_add_flow(flow_table, OFTABLE_DROP_LOOPBACK, 100,
                        &match, &ofpacts);
    }

    /* Handle output to multicast groups, in tables 32 and 33. */
    const struct sbrec_multicast_group *mc;
    struct ofpbuf remote_ofpacts;
    ofpbuf_init(&remote_ofpacts, 0);
    SBREC_MULTICAST_GROUP_FOR_EACH (mc, ctx->ovnsb_idl) {
        struct sset remote_chassis = SSET_INITIALIZER(&remote_chassis);
        struct match match;

        match_init_catchall(&match);
        match_set_metadata(&match, htonll(mc->datapath->tunnel_key));
        match_set_reg(&match, MFF_LOG_OUTPORT - MFF_REG0, mc->tunnel_key);

        /* Go through all of the ports in the multicast group:
         *
         *    - For remote ports, add the chassis to 'remote_chassis'.
         *
         *    - For local ports (other than logical patch ports), add actions
         *      to 'ofpacts' to set the output port and resubmit.
         *
         *    - For logical patch ports, add actions to 'remote_ofpacts'
         *      instead.  (If we put them in 'ofpacts', then the output
         *      would happen on every hypervisor in the multicast group,
         *      effectively duplicating the packet.)
         */
        ofpbuf_clear(&ofpacts);
        ofpbuf_clear(&remote_ofpacts);
        for (size_t i = 0; i < mc->n_ports; i++) {
            struct sbrec_port_binding *port = mc->ports[i];

            if (port->datapath != mc->datapath) {
                static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1);
                VLOG_WARN_RL(&rl, UUID_FMT": multicast group contains ports "
                             "in wrong datapath",
                             UUID_ARGS(&mc->header_.uuid));
                continue;
            }

            int zone_id = simap_get(ct_zones, port->logical_port);
            if (zone_id) {
                put_load(zone_id, MFF_LOG_CT_ZONE, 0, 32, &ofpacts);
            }

            if (!strcmp(port->type, "patch")) {
                put_load(port->tunnel_key, MFF_LOG_OUTPORT, 0, 32,
                         &remote_ofpacts);
                put_resubmit(OFTABLE_DROP_LOOPBACK, &remote_ofpacts);
            } else if (simap_contains(&localvif_to_ofport,
                               (port->parent_port && *port->parent_port)
                               ? port->parent_port : port->logical_port)) {
                put_load(port->tunnel_key, MFF_LOG_OUTPORT, 0, 32, &ofpacts);
                put_resubmit(OFTABLE_DROP_LOOPBACK, &ofpacts);
            } else if (port->chassis) {
                sset_add(&remote_chassis, port->chassis->name);
            } else if (!strcmp(port->type, "localnet")) {
                const char *network = smap_get(&port->options, "network_name");
                if (!network) {
                    continue;
                }
                if (!simap_contains(&localnet_to_ofport, network)) {
                    continue;
                }
                put_load(port->tunnel_key, MFF_LOG_OUTPORT, 0, 32, &ofpacts);
                put_resubmit(OFTABLE_DROP_LOOPBACK, &ofpacts);
            }
        }

        /* Table 33, priority 100.
         * =======================
         *
         * Handle output to the local logical ports in the multicast group, if
         * any. */
        bool local_ports = ofpacts.size > 0;
        if (local_ports) {
            /* Following delivery to local logical ports, restore the multicast
             * group as the logical output port. */
            put_load(mc->tunnel_key, MFF_LOG_OUTPORT, 0, 32, &ofpacts);

            ofctrl_add_flow(flow_table, OFTABLE_LOCAL_OUTPUT, 100,
                            &match, &ofpacts);
        }

        /* Table 32, priority 100.
         * =======================
         *
         * Handle output to the remote chassis in the multicast group, if
         * any. */
        if (!sset_is_empty(&remote_chassis) || remote_ofpacts.size > 0) {
            if (remote_ofpacts.size > 0) {
                /* Following delivery to logical patch ports, restore the
                 * multicast group as the logical output port. */
                put_load(mc->tunnel_key, MFF_LOG_OUTPORT, 0, 32,
                         &remote_ofpacts);
            }

            const char *chassis;
            const struct chassis_tunnel *prev = NULL;
            SSET_FOR_EACH (chassis, &remote_chassis) {
                const struct chassis_tunnel *tun
                    = chassis_tunnel_find(&tunnels, chassis);
                if (!tun) {
                    continue;
                }

                if (!prev || tun->type != prev->type) {
                    put_encapsulation(mff_ovn_geneve, tun, mc->datapath,
                                      mc->tunnel_key, &remote_ofpacts);
                    prev = tun;
                }
                ofpact_put_OUTPUT(&remote_ofpacts)->port = tun->ofport;
            }

            if (remote_ofpacts.size) {
                if (local_ports) {
                    put_resubmit(OFTABLE_LOCAL_OUTPUT, &remote_ofpacts);
                }
                ofctrl_add_flow(flow_table, OFTABLE_REMOTE_OUTPUT, 100,
                                &match, &remote_ofpacts);
            }
        }
        sset_destroy(&remote_chassis);
    }
    ofpbuf_uninit(&remote_ofpacts);

    /* Table 0, priority 100.
     * ======================
     *
     * Process packets that arrive from a remote hypervisor (by matching
     * on tunnel in_port). */

    /* Add flows for Geneve and STT encapsulations.  These
     * encapsulations have metadata about the ingress and egress logical
     * ports.  We set MFF_LOG_DATAPATH, MFF_LOG_INPORT, and
     * MFF_LOG_OUTPORT from the tunnel key data, then resubmit to table
     * 33 to handle packets to the local hypervisor. */
    struct chassis_tunnel *tun;
    HMAP_FOR_EACH (tun, hmap_node, &tunnels) {
        struct match match = MATCH_CATCHALL_INITIALIZER;
        match_set_in_port(&match, tun->ofport);

        ofpbuf_clear(&ofpacts);
        if (tun->type == GENEVE) {
            put_move(MFF_TUN_ID, 0,  MFF_LOG_DATAPATH, 0, 24, &ofpacts);
            put_move(mff_ovn_geneve, 16, MFF_LOG_INPORT, 0, 15,
                     &ofpacts);
            put_move(mff_ovn_geneve, 0, MFF_LOG_OUTPORT, 0, 16,
                     &ofpacts);
        } else if (tun->type == STT) {
            put_move(MFF_TUN_ID, 40, MFF_LOG_INPORT,   0, 15, &ofpacts);
            put_move(MFF_TUN_ID, 24, MFF_LOG_OUTPORT,  0, 16, &ofpacts);
            put_move(MFF_TUN_ID,  0, MFF_LOG_DATAPATH, 0, 24, &ofpacts);
        } else if (tun->type == VXLAN) {
            /* We'll handle VXLAN later. */
            continue;
        } else {
            OVS_NOT_REACHED();
        }

        put_resubmit(OFTABLE_LOCAL_OUTPUT, &ofpacts);

        ofctrl_add_flow(flow_table, OFTABLE_PHY_TO_LOG, 100, &match, &ofpacts);
    }

    /* Add flows for VXLAN encapsulations.  Due to the limited amount of
     * metadata, we only support VXLAN for connections to gateways.  The
     * VNI is used to populate MFF_LOG_DATAPATH.  The gateway's logical
     * port is set to MFF_LOG_INPORT.  Then the packet is resubmitted to
     * table 16 to determine the logical egress port.
     *
     * xxx Due to resubmitting to table 16, broadcasts will be re-sent to
     * xxx all logical ports, including non-local ones which could cause
     * xxx duplicate packets to be received by multiply-connected gateways. */
    HMAP_FOR_EACH (tun, hmap_node, &tunnels) {
        if (tun->type != VXLAN) {
            continue;
        }

        SBREC_PORT_BINDING_FOR_EACH (binding, ctx->ovnsb_idl) {
            struct match match = MATCH_CATCHALL_INITIALIZER;

            if (!binding->chassis ||
                strcmp(tun->chassis_id, binding->chassis->name)) {
                continue;
            }

            match_set_in_port(&match, tun->ofport);
            match_set_tun_id(&match, htonll(binding->datapath->tunnel_key));

            ofpbuf_clear(&ofpacts);
            put_move(MFF_TUN_ID, 0,  MFF_LOG_DATAPATH, 0, 24, &ofpacts);
            put_load(binding->tunnel_key, MFF_LOG_INPORT, 0, 15, &ofpacts);
            put_resubmit(OFTABLE_LOG_INGRESS_PIPELINE, &ofpacts);

            ofctrl_add_flow(flow_table, OFTABLE_PHY_TO_LOG, 100, &match,
                    &ofpacts);
        }
    }

    /* Table 32, Priority 0.
     * =======================
     *
     * Resubmit packets that are not directed at tunnels or part of a
     * multicast group to the local output table. */
    struct match match;
    match_init_catchall(&match);
    ofpbuf_clear(&ofpacts);
    put_resubmit(OFTABLE_LOCAL_OUTPUT, &ofpacts);
    ofctrl_add_flow(flow_table, OFTABLE_REMOTE_OUTPUT, 0, &match, &ofpacts);

    /* Table 34, Priority 0.
     * =======================
     *
     * Resubmit packets that don't output to the ingress port (already checked
     * in table 33) to the logical egress pipeline, clearing the logical
     * registers (for consistent behavior with packets that get tunneled). */
    match_init_catchall(&match);
    ofpbuf_clear(&ofpacts);
#define MFF_LOG_REG(ID) put_load(0, ID, 0, 32, &ofpacts);
    MFF_LOG_REGS;
#undef MFF_LOG_REGS
    put_resubmit(OFTABLE_LOG_EGRESS_PIPELINE, &ofpacts);
    ofctrl_add_flow(flow_table, OFTABLE_DROP_LOOPBACK, 0, &match, &ofpacts);

    ofpbuf_uninit(&ofpacts);
    simap_destroy(&localvif_to_ofport);
    struct chassis_tunnel *tun_next;
    HMAP_FOR_EACH_SAFE (tun, tun_next, hmap_node, &tunnels) {
        hmap_remove(&tunnels, &tun->hmap_node);
        free(tun);
    }
    hmap_destroy(&tunnels);

    /* Table 0, Priority 100.
     * ======================
     *
     * We have now determined the full set of port bindings associated with
     * each "localnet" network.  Only create flows for datapaths that have
     * another local binding.  Otherwise, we know it would just be dropped.
     */
    struct shash_node *ln_bindings_node, *ln_bindings_node_next;
    SHASH_FOR_EACH_SAFE (ln_bindings_node, ln_bindings_node_next,
                         &localnet_inputs) {
        struct localnet_bindings *ln_bindings = ln_bindings_node->data;
        struct localnet_vlan *ln_vlan, *ln_vlan_next;
        HMAP_FOR_EACH_SAFE (ln_vlan, ln_vlan_next, node, &ln_bindings->vlans) {
            struct match match;
            match_init_catchall(&match);
            match_set_in_port(&match, ln_bindings->ofport);
            if (ln_vlan->tag) {
                match_set_dl_vlan(&match, htons(ln_vlan->tag));
            } else {
                /* Match priority-tagged frames, e.g. VLAN ID 0.
                 *
                 * We'll add a second flow for frames that lack any 802.1Q
                 * header later. */
                match_set_dl_tci_masked(&match, htons(VLAN_CFI),
                                        htons(VLAN_VID_MASK | VLAN_CFI));
            }

            struct ofpbuf ofpacts;
            ofpbuf_init(&ofpacts, 0);

            ofpact_put_STRIP_VLAN(&ofpacts);
            uint32_t ofpacts_orig_size = ofpacts.size;

            struct binding_elem *b;
            LIST_FOR_EACH_POP (b, list_elem, &ln_vlan->bindings) {
                struct hmap_node *ld;
                ld = hmap_first_with_hash(&local_datapaths,
                                          b->binding->datapath->tunnel_key);
                if (ld) {
                    /* Set MFF_LOG_DATAPATH and MFF_LOG_INPORT. */
                    put_load(b->binding->datapath->tunnel_key, MFF_LOG_DATAPATH,
                             0, 64, &ofpacts);
                    put_load(b->binding->tunnel_key, MFF_LOG_INPORT, 0, 32,
                             &ofpacts);
                    put_resubmit(OFTABLE_LOG_INGRESS_PIPELINE, &ofpacts);
                }

                free(b);
            }

            if (ofpacts.size > ofpacts_orig_size) {
                ofctrl_add_flow(flow_table, 0, 100, &match, &ofpacts);

                if (!ln_vlan->tag) {
                    /* Add a second flow for frames that lack any 802.1Q
                     * header.  For these, drop the OFPACT_STRIP_VLAN
                     * action. */
                    ofpbuf_pull(&ofpacts, ofpacts_orig_size);
                    match_set_dl_tci_masked(&match, 0, htons(VLAN_CFI));
                    ofctrl_add_flow(flow_table, 0, 100, &match, &ofpacts);
                }
            }

            ofpbuf_uninit(&ofpacts);

            hmap_remove(&ln_bindings->vlans, &ln_vlan->node);
            free(ln_vlan);
        }
        shash_delete(&localnet_inputs, ln_bindings_node);
        hmap_destroy(&ln_bindings->vlans);
        free(ln_bindings);
    }
    shash_destroy(&localnet_inputs);

    struct hmap_node *node;
    while ((node = hmap_first(&local_datapaths))) {
        hmap_remove(&local_datapaths, node);
        free(node);
    }
    hmap_destroy(&local_datapaths);

    simap_destroy(&localnet_to_ofport);
}