aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/dpo/dvr_dpo.c
blob: 6dd58108091112193cbc9e0ae96f7fc7e7eaec69 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68

@media only all and (prefers-color-scheme: dark) {
.highlight .hll { background-color: #49483e }
.highlight .c { color: #75715e } /* Comment */
.highlight .err { color: #960050; background-color: #1e0010 } /* Error */
.highlight .k { color: #66d9ef } /* Keyword */
.highlight .l { color: #ae81ff } /* Literal */
.highlight .n { color: #f8f8f2 } /* Name */
.highlight .o { color: #f92672 } /* Operator */
.highlight .p { color: #f8f8f2 } /* Punctuation */
.highlight .ch { color: #75715e } /* Comment.Hashbang */
.highlight .cm { color: #75715e } /* Comment.Multiline */
.highlight .cp { color: #75715e } /* Comment.Preproc */
.highlight .cpf { color: #75715e } /* Comment.PreprocFile */
.highlight .c1 { color: #75715e } /* Comment.Single */
.highlight .cs { color: #75715e } /* Comment.Special */
.highlight .gd { color: #f92672 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gi { color: #a6e22e } /* Generic.Inserted */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #75715e } /* Generic.Subheading */
.highlight .kc { color: #66d9ef } /* Keyword.Constant */
.highlight .kd { color: #66d9ef } /* Keyword.Declaration */
.highlight .kn { color: #f92672 } /* Keyword.Namespace */
.highlight .kp { color: #66d9ef } /* Keyword.Pseudo */
.highlight .kr { color: #66d9ef } /* Keyword.Reserved */
.highlight .kt { color: #66d9ef } /* Keyword.Type */
.highlight .ld { color: #e6db74 } /* Literal.Date */
.highlight .m { color: #ae81ff } /* Literal.Number */
.highlight .s { color: #e6db74 } /* Literal.String */
.highlight .na { color: #a6e22e } /* Name.Attribute */
.highlight .nb { color: #f8f8f2 } /* Name.Builtin */
.highlight .nc { color: #a6e22e } /* Name.Class */
.highlight .no { color: #66d9ef } /* Name.Constant */
.highlight .nd { color: #a6e22e } /* Name.Decorator */
.highlight .ni { color: #f8f8f2 } /* Name.Entity */
.highlight .ne { color: #a6e22e } /* Name.Exception */
.highlight .nf { color: #a6e22e } /* Name.Function */
.highlight .nl { color: #f8f8f2 } /* Name.Label */
.highlight .nn { color: #f8f8f2 } /* Name.Namespace */
.highlight .nx { color: #a6e22e } /* Name.Other */
.highlight .py { color: #f8f8f2 } /* Name.Property */
.highlight .nt { color: #f92672 } /* Name.Tag */
.highlight .nv { color: #f8f8f2 } /* Name.Variable */
.highlight .ow { color: #f92672 } /* Operator.Word */
.highlight .w { color: #f8f8f2 } /* Text.Whitespace */
.highlight .mb { color: #ae81ff } /* Literal.Number.Bin */
.highlight .mf { color: #ae81ff } /* Literal.Number.Float */
.highlight .mh { color: #ae81ff } /* Literal.Number.Hex */
.highlight .mi { color: #ae81ff } /* Literal.Number.Integer */
.highlight .mo { color: #ae81ff } /* Literal.Number.Oct */
.highlight .sa { color: #e6db74 } /* Literal.String.Affix */
.highlight .sb { color: #e6db74 } /* Literal.String.Backtick */
.highlight .sc { color: #e6db74 } /* Literal.String.Char */
.highlight .dl { color: #e6db74 } /* Literal.String.Delimiter */
.highlight .sd { color: #e6db74 } /* Literal.String.Doc */
.highlight .s2 { color: #e6db74 } /* Literal.String.Double */
.highlight .se { color: #ae81ff } /* Literal.String.Escape */
.highlight .sh { color: #e6db74 } /* Literal.String.Heredoc */
.highlight .si { color: #e6db74 } /* Literal.String.Interpol */
.highlight .sx { color: #e6db74 } /* Literal.String.Other */
.highlight .sr { color: #e6db74 } /* Literal.String.Regex */
.highlight .s1 { color: #e6db74 } /* Literal.String.Single */
.highlight .ss { color: #e6db74 } /* Literal.String.Symbol */
.highlight .bp { color: #f8f8f2 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #a6e22e } /* Name.Function.Magic */
.highlight .vc { color: #f8f8f2 } /* Name.Variable.Class */
.highlight .vg { color: #f8f8f2 } /* Name.Variable.Global */
.highlight .vi { color: #f8f8f2 } /* Name.Variable.Instance */
.highlight .vm { color: #f8f8f2 } /* Name.Variable.Magic */
.highlight .il { color: #ae81ff } /* Literal.Number.Integer.Long */
}
@media (prefers-color-scheme: light) {
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
}
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * 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.
 */

#ifndef __FIB_ENTRY_COVER_H__
#define __FIB_ENTRY_COVER_H__

#include "fib_entry.h"

/**
 * callback function used when walking the covered entries
 */
typedef int (*fib_entry_covered_walk_t)(fib_entry_t *cover,
					fib_node_index_t covered,
					void *ctx);

extern u32 fib_entry_cover_track(fib_entry_t *cover,
				 fib_node_index_t covered);

extern void fib_entry_cover_untrack(fib_entry_t *cover,
				    u32 tracked_index);

extern void fib_entry_cover_walk(fib_entry_t *cover,
				 fib_entry_covered_walk_t walk,
				 void *ctx);

extern void fib_entry_cover_change_notify(fib_node_index_t cover_index,
					  fib_node_index_t covered_index);
extern void fib_entry_cover_update_notify(fib_entry_t *cover);

#endif
ef='#n464'>464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 * 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 <vnet/dpo/dvr_dpo.h>
#include <vnet/fib/fib_node.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/l2/l2_input.h>

#ifndef CLIB_MARCH_VARIANT
dvr_dpo_t *dvr_dpo_pool;

/**
 * The 'DB' of DVR DPOs.
 * There is one per-interface per-L3 proto, so this is a per-interface vector
 */
static index_t *dvr_dpo_db[DPO_PROTO_NUM];

static dvr_dpo_t *
dvr_dpo_alloc (void)
{
    dvr_dpo_t *dd;

    pool_get(dvr_dpo_pool, dd);

    return (dd);
}

static inline dvr_dpo_t *
dvr_dpo_get_from_dpo (const dpo_id_t *dpo)
{
    ASSERT(DPO_DVR == dpo->dpoi_type);

    return (dvr_dpo_get(dpo->dpoi_index));
}

static inline index_t
dvr_dpo_get_index (dvr_dpo_t *dd)
{
    return (dd - dvr_dpo_pool);
}

static void
dvr_dpo_lock (dpo_id_t *dpo)
{
    dvr_dpo_t *dd;

    dd = dvr_dpo_get_from_dpo(dpo);
    dd->dd_locks++;
}

static void
dvr_dpo_unlock (dpo_id_t *dpo)
{
    dvr_dpo_t *dd;

    dd = dvr_dpo_get_from_dpo(dpo);
    dd->dd_locks--;

    if (0 == dd->dd_locks)
    {
        if (DPO_PROTO_IP4 == dd->dd_proto)
        {
            vnet_feature_enable_disable ("ip4-output", "ip4-dvr-reinject",
                                         dd->dd_sw_if_index, 0, 0, 0);
        }
        else
        {
            vnet_feature_enable_disable ("ip6-output", "ip6-dvr-reinject",
                                         dd->dd_sw_if_index, 0, 0, 0);
        }

        dvr_dpo_db[dd->dd_proto][dd->dd_sw_if_index] = INDEX_INVALID;
        pool_put(dvr_dpo_pool, dd);
    }
}

void
dvr_dpo_add_or_lock (u32 sw_if_index,
                     dpo_proto_t dproto,
                     dpo_id_t *dpo)
{
    l2_input_config_t *config;
    dvr_dpo_t *dd;

    vec_validate_init_empty(dvr_dpo_db[dproto],
                            sw_if_index,
                            INDEX_INVALID);

    if (INDEX_INVALID == dvr_dpo_db[dproto][sw_if_index])
    {
        dd = dvr_dpo_alloc();

        dd->dd_sw_if_index = sw_if_index;
        dd->dd_proto = dproto;

        dvr_dpo_db[dproto][sw_if_index] = dvr_dpo_get_index(dd);

        config = l2input_intf_config (sw_if_index);

        if (config->bridge || config->xconnect)
        {
            dd->dd_reinject = DVR_REINJECT_L2;
        }
        else
        {
            dd->dd_reinject = DVR_REINJECT_L3;
        }

        /*
         * enable the reinject into L2 path feature on the interface
         */
        if (DPO_PROTO_IP4 == dproto)
            vnet_feature_enable_disable ("ip4-output", "ip4-dvr-reinject",
                                         dd->dd_sw_if_index, 1, 0, 0);
        else if (DPO_PROTO_IP6 == dproto)
            vnet_feature_enable_disable ("ip6-output", "ip6-dvr-reinject",
                                         dd->dd_sw_if_index, 1, 0, 0);
        else
            ASSERT(0);
    }
    else
    {
        dd = dvr_dpo_get(dvr_dpo_db[dproto][sw_if_index]);
    }

    dpo_set(dpo, DPO_DVR, dproto, dvr_dpo_get_index(dd));
}
#endif /* CLIB_MARCH_VARIANT */


static clib_error_t *
dvr_dpo_interface_state_change (vnet_main_t * vnm,
                                      u32 sw_if_index,
                                      u32 flags)
{
    /*
     */
    return (NULL);
}

VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(
    dvr_dpo_interface_state_change);

/**
 * @brief Registered callback for HW interface state changes
 */
static clib_error_t *
dvr_dpo_hw_interface_state_change (vnet_main_t * vnm,
                                         u32 hw_if_index,
                                         u32 flags)
{
    return (NULL);
}

VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(
    dvr_dpo_hw_interface_state_change);

static clib_error_t *
dvr_dpo_interface_delete (vnet_main_t * vnm,
                                u32 sw_if_index,
                                u32 is_add)
{
    return (NULL);
}

VNET_SW_INTERFACE_ADD_DEL_FUNCTION(
    dvr_dpo_interface_delete);

#ifndef CLIB_MARCH_VARIANT
static u8*
format_dvr_reinject (u8* s, va_list *ap)
{
    dvr_dpo_reinject_t ddr = va_arg(*ap, int);

    switch (ddr)
    {
    case DVR_REINJECT_L2:
        s = format (s, "l2");
        break;
    case DVR_REINJECT_L3:
        s = format (s, "l3");
        break;
    }
    return (s);
}

static u8*
format_dvr_dpo (u8* s, va_list *ap)
{
    index_t index = va_arg(*ap, index_t);
    CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
    vnet_main_t * vnm = vnet_get_main();
    dvr_dpo_t *dd = dvr_dpo_get(index);

    return (format(s, "%U-dvr-%U-dpo %U",
                   format_dpo_proto, dd->dd_proto,
                   format_vnet_sw_interface_name,
                   vnm,
                   vnet_get_sw_interface(vnm, dd->dd_sw_if_index),
                   format_dvr_reinject, dd->dd_reinject));
}

static void
dvr_dpo_mem_show (void)
{
    fib_show_memory_usage("DVR",
                          pool_elts(dvr_dpo_pool),
                          pool_len(dvr_dpo_pool),
                          sizeof(dvr_dpo_t));
}


const static dpo_vft_t dvr_dpo_vft = {
    .dv_lock = dvr_dpo_lock,
    .dv_unlock = dvr_dpo_unlock,
    .dv_format = format_dvr_dpo,
    .dv_mem_show = dvr_dpo_mem_show,
};

/**
 * @brief The per-protocol VLIB graph nodes that are assigned to a glean
 *        object.
 *
 * this means that these graph nodes are ones from which a glean is the
 * parent object in the DPO-graph.
 */
const static char* const dvr_dpo_ip4_nodes[] =
{
    "ip4-dvr-dpo",
    NULL,
};
const static char* const dvr_dpo_ip6_nodes[] =
{
    "ip6-dvr-dpo",
    NULL,
};

const static char* const * const dvr_dpo_nodes[DPO_PROTO_NUM] =
{
    [DPO_PROTO_IP4]  = dvr_dpo_ip4_nodes,
    [DPO_PROTO_IP6]  = dvr_dpo_ip6_nodes,
};

void
dvr_dpo_module_init (void)
{
    dpo_register(DPO_DVR,
                 &dvr_dpo_vft,
                 dvr_dpo_nodes);
}
#endif /* CLIB_MARCH_VARIANT */

/**
 * @brief Interface DPO trace data
 */
typedef struct dvr_dpo_trace_t_
{
    u32 sw_if_index;
} dvr_dpo_trace_t;

always_inline uword
dvr_dpo_inline (vlib_main_t * vm,
                vlib_node_runtime_t * node,
                vlib_frame_t * from_frame,
                u8 is_ip6)
{
    u32 n_left_from, next_index, * from, * to_next;
    ip_lookup_main_t *lm = (is_ip6?
                            &ip6_main.lookup_main:
                            &ip4_main.lookup_main);

    from = vlib_frame_vector_args (from_frame);
    n_left_from = from_frame->n_vectors;

    next_index = node->cached_next_index;

    while (n_left_from > 0)
    {
        u32 n_left_to_next;

        vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);

        while (n_left_from >= 4 && n_left_to_next > 2)
        {
            const dvr_dpo_t *dd0, *dd1;
            u32 bi0, ddi0, bi1, ddi1;
            vlib_buffer_t *b0, *b1;
            u32 next0, next1;
            u8 len0, len1;

            bi0 = from[0];
            to_next[0] = bi0;
            bi1 = from[1];
            to_next[1] = bi1;
            from += 2;
            to_next += 2;
            n_left_from -= 2;
            n_left_to_next -= 2;
            next0 = next1 = 0;

            b0 = vlib_get_buffer (vm, bi0);
            b1 = vlib_get_buffer (vm, bi1);

            ddi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
            ddi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
            dd0 = dvr_dpo_get(ddi0);
            dd1 = dvr_dpo_get(ddi1);

            vnet_buffer(b0)->sw_if_index[VLIB_TX] = dd0->dd_sw_if_index;
            vnet_buffer(b1)->sw_if_index[VLIB_TX] = dd1->dd_sw_if_index;

            len0 = ((u8*)vlib_buffer_get_current(b0) -
                    (u8*)ethernet_buffer_get_header(b0));
            len1 = ((u8*)vlib_buffer_get_current(b1) -
                    (u8*)ethernet_buffer_get_header(b1));
            vnet_buffer(b0)->l2.l2_len =
                vnet_buffer(b0)->ip.save_rewrite_length =
                   len0;
            vnet_buffer(b1)->l2.l2_len =
                vnet_buffer(b1)->ip.save_rewrite_length =
                    len1;

            b0->flags |= VNET_BUFFER_F_IS_DVR;
            b1->flags |= VNET_BUFFER_F_IS_DVR;

            vlib_buffer_advance(b0, -len0);
            vlib_buffer_advance(b1, -len1);

            vnet_feature_arc_start (lm->output_feature_arc_index,
                                    dd0->dd_sw_if_index, &next0, b0);
            vnet_feature_arc_start (lm->output_feature_arc_index,
                                    dd1->dd_sw_if_index, &next1, b1);

            if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr0;

                tr0 = vlib_add_trace (vm, node, b0, sizeof (*tr0));
                tr0->sw_if_index = dd0->dd_sw_if_index;
            }
            if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr1;

                tr1 = vlib_add_trace (vm, node, b1, sizeof (*tr1));
                tr1->sw_if_index = dd1->dd_sw_if_index;
            }

            vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
                                            n_left_to_next, bi0, bi1,
                                            next0, next1);
        }

        while (n_left_from > 0 && n_left_to_next > 0)
        {
            const dvr_dpo_t * dd0;
            vlib_buffer_t * b0;
            u32 bi0, ddi0;
            u32 next0;
            u8 len0;

            bi0 = from[0];
            to_next[0] = bi0;
            from += 1;
            to_next += 1;
            n_left_from -= 1;
            n_left_to_next -= 1;
            next0 = 0;

            b0 = vlib_get_buffer (vm, bi0);

            ddi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
            dd0 = dvr_dpo_get(ddi0);

            vnet_buffer(b0)->sw_if_index[VLIB_TX] = dd0->dd_sw_if_index;

            /*
             * take that, rewind it back...
             */
            len0 = ((u8*)vlib_buffer_get_current(b0) -
                    (u8*)ethernet_buffer_get_header(b0));
            vnet_buffer(b0)->l2.l2_len =
                vnet_buffer(b0)->ip.save_rewrite_length =
                    len0;
            b0->flags |= VNET_BUFFER_F_IS_DVR;
            vlib_buffer_advance(b0, -len0);

            /*
             * start processing the ipX output features
             */
            vnet_feature_arc_start(lm->output_feature_arc_index,
                                   dd0->dd_sw_if_index, &next0, b0);

            if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr;

                tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
                tr->sw_if_index = dd0->dd_sw_if_index;
            }

            vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
                                            n_left_to_next, bi0,
                                            next0);
        }
        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
    return from_frame->n_vectors;
}

static u8 *
format_dvr_dpo_trace (u8 * s, va_list * args)
{
    CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
    CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
    dvr_dpo_trace_t * t = va_arg (*args, dvr_dpo_trace_t *);
    u32 indent = format_get_indent (s);
    s = format (s, "%U sw_if_index:%d",
                format_white_space, indent,
                t->sw_if_index);
    return s;
}

VLIB_NODE_FN (ip4_dvr_dpo_node) (vlib_main_t * vm,
             vlib_node_runtime_t * node,
             vlib_frame_t * from_frame)
{
    return (dvr_dpo_inline(vm, node, from_frame, 0));
}

VLIB_NODE_FN (ip6_dvr_dpo_node) (vlib_main_t * vm,
             vlib_node_runtime_t * node,
             vlib_frame_t * from_frame)
{
    return (dvr_dpo_inline(vm, node, from_frame, 1));
}

VLIB_REGISTER_NODE (ip4_dvr_dpo_node) = {
    .name = "ip4-dvr-dpo",
    .vector_size = sizeof (u32),
    .format_trace = format_dvr_dpo_trace,
    .sibling_of = "ip4-rewrite",
};
VLIB_REGISTER_NODE (ip6_dvr_dpo_node) = {
    .name = "ip6-dvr-dpo",
    .vector_size = sizeof (u32),
    .format_trace = format_dvr_dpo_trace,
    .sibling_of = "ip6-rewrite",
};

typedef enum dvr_reinject_next_t_
{
    DVR_REINJECT_NEXT_L2,
    DVR_REINJECT_NEXT_L3,
} dvr_reinject_next_t;

always_inline uword
dvr_reinject_inline (vlib_main_t * vm,
                     vlib_node_runtime_t * node,
                     vlib_frame_t * from_frame)
{
    u32 n_left_from, next_index, * from, * to_next;

    from = vlib_frame_vector_args (from_frame);
    n_left_from = from_frame->n_vectors;

    next_index = node->cached_next_index;

    while (n_left_from > 0)
    {
        u32 n_left_to_next;

        vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);

        while (n_left_from >= 4 && n_left_to_next > 2)
        {
            dvr_reinject_next_t next0, next1;
            const dvr_dpo_t *dd0, *dd1;
            u32 bi0, bi1, ddi0, ddi1;
            vlib_buffer_t *b0, *b1;

            bi0 = from[0];
            to_next[0] = bi0;
            bi1 = from[1];
            to_next[1] = bi1;
            from += 2;
            to_next += 2;
            n_left_from -= 2;
            n_left_to_next -= 2;

            b0 = vlib_get_buffer (vm, bi0);
            b1 = vlib_get_buffer (vm, bi1);

            if (b0->flags & VNET_BUFFER_F_IS_DVR)
            {
                ddi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
                dd0 = dvr_dpo_get(ddi0);
                next0 = (dd0->dd_reinject == DVR_REINJECT_L2 ?
                         DVR_REINJECT_NEXT_L2 :
                         DVR_REINJECT_NEXT_L3);
            }
            else
                vnet_feature_next( &next0, b0);

            if (b1->flags & VNET_BUFFER_F_IS_DVR)
            {
                ddi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
                dd1 = dvr_dpo_get(ddi1);
                next1 = (dd1->dd_reinject == DVR_REINJECT_L2 ?
                         DVR_REINJECT_NEXT_L2 :
                         DVR_REINJECT_NEXT_L3);
            }
            else
                vnet_feature_next( &next1, b1);

            if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr0;

                tr0 = vlib_add_trace (vm, node, b0, sizeof (*tr0));
                tr0->sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_TX];
            }
            if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr1;

                tr1 = vlib_add_trace (vm, node, b1, sizeof (*tr1));
                tr1->sw_if_index = vnet_buffer(b1)->sw_if_index[VLIB_TX];
            }

            vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
                                            n_left_to_next, bi0, bi1,
                                            next0, next1);
        }

        while (n_left_from > 0 && n_left_to_next > 0)
        {
            dvr_reinject_next_t next0;
            const dvr_dpo_t *dd0;
            vlib_buffer_t * b0;
            u32 bi0, ddi0;

            bi0 = from[0];
            to_next[0] = bi0;
            from += 1;
            to_next += 1;
            n_left_from -= 1;
            n_left_to_next -= 1;

            b0 = vlib_get_buffer (vm, bi0);

            if (b0->flags & VNET_BUFFER_F_IS_DVR)
            {
                ddi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
                dd0 = dvr_dpo_get(ddi0);
                next0 = (dd0->dd_reinject == DVR_REINJECT_L2 ?
                         DVR_REINJECT_NEXT_L2 :
                         DVR_REINJECT_NEXT_L3);
            }
            else
                vnet_feature_next( &next0, b0);

            if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
            {
                dvr_dpo_trace_t *tr;

                tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
                tr->sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_TX];
            }

            vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
                                            n_left_to_next, bi0, next0);
        }
        vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }
    return from_frame->n_vectors;
}

VLIB_NODE_FN (ip4_dvr_reinject_node) (vlib_main_t * vm,
                  vlib_node_runtime_t * node,
                  vlib_frame_t * from_frame)
{
    return (dvr_reinject_inline(vm, node, from_frame));
}

VLIB_NODE_FN (ip6_dvr_reinject_node) (vlib_main_t * vm,
                  vlib_node_runtime_t * node,
                  vlib_frame_t * from_frame)
{
    return (dvr_reinject_inline(vm, node, from_frame));
}

VLIB_REGISTER_NODE (ip4_dvr_reinject_node) = {
    .name = "ip4-dvr-reinject",
    .vector_size = sizeof (u32),
    .format_trace = format_dvr_dpo_trace,

    .n_next_nodes = 1,
    .next_nodes = {
        [DVR_REINJECT_NEXT_L2] = "l2-output",
        [DVR_REINJECT_NEXT_L3] = "interface-output",
    },
};

VLIB_REGISTER_NODE (ip6_dvr_reinject_node) = {
    .name = "ip6-dvr-reinject",
    .vector_size = sizeof (u32),
    .format_trace = format_dvr_dpo_trace,

    .n_next_nodes = 1,
    .next_nodes = {
        [DVR_REINJECT_NEXT_L2] = "l2-output",
        [DVR_REINJECT_NEXT_L3] = "interface-output",
    },
};

VNET_FEATURE_INIT (ip4_dvr_reinject_feat_node, static) =
{
  .arc_name = "ip4-output",
  .node_name = "ip4-dvr-reinject",
  .runs_after = VNET_FEATURES ("nat44-in2out-output",
                               "acl-plugin-out-ip4-fa"),
};
VNET_FEATURE_INIT (ip6_dvr_reinject_feat_node, static) =
{
  .arc_name = "ip6-output",
  .node_name = "ip6-dvr-reinject",
  .runs_after = VNET_FEATURES ("acl-plugin-out-ip6-fa"),
};