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/* Hey Emacs use -*- mode: C -*- */
/*
 * Copyright (c) 2015-2019 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.
 */

option version = "2.0.1";

import "vnet/interface_types.api";
import "vnet/ip/ip_types.api";

/** \brief A GRE tunnel type
*/
enum gre_tunnel_type : u8
{
  GRE_API_TUNNEL_TYPE_L3 = 0,
  GRE_API_TUNNEL_TYPE_TEB,
  GRE_API_TUNNEL_TYPE_ERSPAN,
};

/** \brief A GRE tunnel mode
*/
enum gre_tunnel_mode : u8
{
  /* point-to-point */
  GRE_API_TUNNEL_MODE_P2P,
  /* multi-point */
  GRE_API_TUNNEL_MODE_MP,
};

/** \brief A GRE tunnel
    @param client_index - opaque cookie to identify the sender
    @param context - sender context, to match reply w/ request
    @param tunnel_type - 0: L3, 1: TEB, 2: ERSPAN
    @param instance - optional unique custom device instance, else ~0.
    @param src - Source IP address
    @param dst - Destination IP address, can be multicast
    @param outer_table_id - Encap FIB table ID
    @param session_id - session for ERSPAN tunnel, range 0-1023
    @param sw_if_index - ignored on create/delete, present in details.
*/
typedef gre_tunnel
{
  vl_api_gre_tunnel_type_t type;
  vl_api_gre_tunnel_mode_t mode;
  u16 session_id;
  u32 instance;
  u32 outer_table_id;
  vl_api_interface_index_t sw_if_index;
  vl_api_address_t src;
  vl_api_address_t dst;
};

define gre_tunnel_add_del
{
  u32 client_index;
  u32 context;
  bool is_add;
  vl_api_gre_tunnel_t tunnel;
};

define gre_tunnel_add_del_reply
{
  u32 context;
  i32 retval;
  vl_api_interface_index_t sw_if_index;
};

define gre_tunnel_dump
{
  u32 client_index;
  u32 context;
  vl_api_interface_index_t sw_if_index;
};

define gre_tunnel_details
{
  u32 context;
  vl_api_gre_tunnel_t tunnel;
};

/*
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
'#n455'>455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532
/*
 * 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.
 */
/**
 * @brief
 * A Data-Path Object is an object that represents actions that are
 * applied to packets are they are switched through VPP.
 * 
 * The DPO is a base class that is specialised by other objects to provide
 * concreate actions
 *
 * The VLIB graph nodes are graph of types, the DPO graph is a graph of instances.
 */

#include <vnet/dpo/dpo.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/format.h>
#include <vnet/adj/adj.h>

#include <vnet/dpo/load_balance.h>
#include <vnet/dpo/mpls_label_dpo.h>
#include <vnet/dpo/lookup_dpo.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/dpo/receive_dpo.h>
#include <vnet/dpo/punt_dpo.h>
#include <vnet/dpo/classify_dpo.h>
#include <vnet/dpo/ip_null_dpo.h>
#include <vnet/dpo/replicate_dpo.h>
#include <vnet/dpo/interface_dpo.h>
#include <vnet/dpo/mpls_disposition.h>

/**
 * Array of char* names for the DPO types and protos
 */
static const char* dpo_type_names[] = DPO_TYPES;
static const char* dpo_proto_names[] = DPO_PROTOS;

/**
 * @brief Vector of virtual function tables for the DPO types
 *
 * This is a vector so we can dynamically register new DPO types in plugins.
 */
static dpo_vft_t *dpo_vfts;

/**
 * @brief vector of graph node names associated with each DPO type and protocol.
 *
 *   dpo_nodes[child_type][child_proto][node_X] = node_name;
 * i.e.
 *   dpo_node[DPO_LOAD_BALANCE][DPO_PROTO_IP4][0] = "ip4-lookup"
 *   dpo_node[DPO_LOAD_BALANCE][DPO_PROTO_IP4][1] = "ip4-load-balance"
 *
 * This is a vector so we can dynamically register new DPO types in plugins.
 */
static const char* const * const ** dpo_nodes;

/**
 * @brief Vector of edge indicies from parent DPO nodes to child
 *
 * dpo_edges[child_type][child_proto][parent_type][parent_proto] = edge_index
 *
 * This array is derived at init time from the dpo_nodes above. Note that
 * the third dimension in dpo_nodes is lost, hence, the edge index from each
 * node MUST be the same.
 * Including both the child and parent protocol is required to support the
 * case where it changes as the grapth is traversed, most notablly when an
 * MPLS label is popped.
 *
 * Note that this array is child type specific, not child instance specific.
 */
static u32 ****dpo_edges;

/**
 * @brief The DPO type value that can be assigend to the next dynamic
 *        type registration.
 */
static dpo_type_t dpo_dynamic = DPO_LAST;

dpo_proto_t
vnet_link_to_dpo_proto (vnet_link_t linkt)
{
    switch (linkt)
    {
    case VNET_LINK_IP6:
        return (DPO_PROTO_IP6);
    case VNET_LINK_IP4:
        return (DPO_PROTO_IP4);
    case VNET_LINK_MPLS:
        return (DPO_PROTO_MPLS);
    case VNET_LINK_ETHERNET:
        return (DPO_PROTO_ETHERNET);
    case VNET_LINK_NSH:
        return (DPO_PROTO_NSH);
    case VNET_LINK_ARP:
	break;
    }
    ASSERT(0);
    return (0);
}

u8 *
format_dpo_type (u8 * s, va_list * args)
{
    dpo_type_t type = va_arg (*args, int);

    s = format(s, "%s", dpo_type_names[type]);

    return (s);
}

u8 *
format_dpo_id (u8 * s, va_list * args)
{
    dpo_id_t *dpo = va_arg (*args, dpo_id_t*);
    u32 indent = va_arg (*args, u32);

    s = format(s, "[@%d]: ", dpo->dpoi_next_node);

    if (NULL != dpo_vfts[dpo->dpoi_type].dv_format)
    {
        return (format(s, "%U",
                       dpo_vfts[dpo->dpoi_type].dv_format,
                       dpo->dpoi_index,
                       indent));
    }

    switch (dpo->dpoi_type)
    {
    case DPO_FIRST:
	s = format(s, "unset");
	break;
    default:
	s = format(s, "unknown");
	break;
    }
    return (s);
}

u8 *
format_dpo_proto (u8 * s, va_list * args)
{
    dpo_proto_t proto = va_arg (*args, int);

    return (format(s, "%s", dpo_proto_names[proto]));
}

void
dpo_set (dpo_id_t *dpo,
	 dpo_type_t type,
	 dpo_proto_t proto,
	 index_t index)
{
    dpo_id_t tmp = *dpo;

    dpo->dpoi_type = type;
    dpo->dpoi_proto = proto,
    dpo->dpoi_index = index;

    if (DPO_ADJACENCY == type)
    {
	/*
	 * set the adj subtype
	 */
	ip_adjacency_t *adj;

	adj = adj_get(index);

	switch (adj->lookup_next_index)
	{
	case IP_LOOKUP_NEXT_ARP:
	    dpo->dpoi_type = DPO_ADJACENCY_INCOMPLETE;
	    break;
	case IP_LOOKUP_NEXT_MIDCHAIN:
	    dpo->dpoi_type = DPO_ADJACENCY_MIDCHAIN;
	    break;
	case IP_LOOKUP_NEXT_MCAST_MIDCHAIN:
	    dpo->dpoi_type = DPO_ADJACENCY_MCAST_MIDCHAIN;
	    break;
	case IP_LOOKUP_NEXT_MCAST:
	    dpo->dpoi_type = DPO_ADJACENCY_MCAST;
            break;
	case IP_LOOKUP_NEXT_GLEAN:
	    dpo->dpoi_type = DPO_ADJACENCY_GLEAN;
	    break;
	default:
	    break;
	}
    }
    dpo_lock(dpo);
    dpo_unlock(&tmp);
}

void
dpo_reset (dpo_id_t *dpo)
{
    dpo_id_t tmp = DPO_INVALID;

    /*
     * use the atomic copy operation.
     */
    dpo_copy(dpo, &tmp);
}

/**
 * \brief
 * Compare two Data-path objects
 *
 * like memcmp, return 0 is matching, !0 otherwise.
 */
int
dpo_cmp (const dpo_id_t *dpo1,
	 const dpo_id_t *dpo2)
{
    int res;

    res = dpo1->dpoi_type - dpo2->dpoi_type;

    if (0 != res) return (res);

    return (dpo1->dpoi_index - dpo2->dpoi_index);
}

void
dpo_copy (dpo_id_t *dst,
	  const dpo_id_t *src)
{
    dpo_id_t tmp = *dst;

    /*
     * the destination is written in a single u64 write - hence atomically w.r.t
     * any packets inflight.
     */
    *((u64*)dst) = *(u64*)src; 

    dpo_lock(dst);
    dpo_unlock(&tmp);    
}

int
dpo_is_adj (const dpo_id_t *dpo)
{
    return ((dpo->dpoi_type == DPO_ADJACENCY) ||
	    (dpo->dpoi_type == DPO_ADJACENCY_INCOMPLETE) ||
	    (dpo->dpoi_type == DPO_ADJACENCY_MIDCHAIN) ||
	    (dpo->dpoi_type == DPO_ADJACENCY_GLEAN));
}

void
dpo_register (dpo_type_t type,
	      const dpo_vft_t *vft,
              const char * const * const * nodes)
{
    vec_validate(dpo_vfts, type);
    dpo_vfts[type] = *vft;

    vec_validate(dpo_nodes, type);
    dpo_nodes[type] = nodes;
}

dpo_type_t
dpo_register_new_type (const dpo_vft_t *vft,
                       const char * const * const * nodes)
{
    dpo_type_t type = dpo_dynamic++;

    dpo_register(type, vft, nodes);

    return (type);
}

void
dpo_lock (dpo_id_t *dpo)
{
    if (!dpo_id_is_valid(dpo))
	return;

    dpo_vfts[dpo->dpoi_type].dv_lock(dpo);
}

void
dpo_unlock (dpo_id_t *dpo)
{
    if (!dpo_id_is_valid(dpo))
	return;

    dpo_vfts[dpo->dpoi_type].dv_unlock(dpo);
}


static u32
dpo_get_next_node (dpo_type_t child_type,
                   dpo_proto_t child_proto,
                   const dpo_id_t *parent_dpo)
{
    dpo_proto_t parent_proto;
    dpo_type_t parent_type;

    parent_type = parent_dpo->dpoi_type;
    parent_proto = parent_dpo->dpoi_proto;

    vec_validate(dpo_edges, child_type);
    vec_validate(dpo_edges[child_type], child_proto);
    vec_validate(dpo_edges[child_type][child_proto], parent_type);
    vec_validate_init_empty(
        dpo_edges[child_type][child_proto][parent_type],
        parent_proto, ~0);

    /*
     * if the edge index has not yet been created for this node to node transistion
     */
    if (~0 == dpo_edges[child_type][child_proto][parent_type][parent_proto])
    {
        vlib_node_t *parent_node, *child_node;
        vlib_main_t *vm;
        u32 edge ,pp, cc;

        vm = vlib_get_main();

        vlib_worker_thread_barrier_sync(vm);

        ASSERT(NULL != dpo_nodes[child_type]);
        ASSERT(NULL != dpo_nodes[child_type][child_proto]);
        ASSERT(NULL != dpo_nodes[parent_type]);
        ASSERT(NULL != dpo_nodes[parent_type][parent_proto]);

        cc = 0;

        /*
         * create a graph arc from each of the parent's registered node types,
         * to each of the childs.
         */
        while (NULL != dpo_nodes[child_type][child_proto][cc])
        {
            child_node =
                vlib_get_node_by_name(vm,
                                      (u8*) dpo_nodes[child_type][child_proto][cc]);

            pp = 0;

            while (NULL != dpo_nodes[parent_type][parent_proto][pp])
            {
                parent_node =
                    vlib_get_node_by_name(vm,
                                          (u8*) dpo_nodes[parent_type][parent_proto][pp]);

                edge = vlib_node_add_next(vm,
                                          child_node->index,
                                          parent_node->index);

                if (~0 == dpo_edges[child_type][child_proto][parent_type][parent_proto])
                {
                    dpo_edges[child_type][child_proto][parent_type][parent_proto] = edge;
                }
                else
                {
                    ASSERT(dpo_edges[child_type][child_proto][parent_type][parent_proto] == edge);
                }
                pp++;
            }
            cc++;
        }

        vlib_worker_thread_barrier_release(vm);
    }

    return (dpo_edges[child_type][child_proto][parent_type][parent_proto]);
}

/**
 * @brief Stack one DPO object on another, and thus establish a child parent
 * relationship. The VLIB graph arc used is taken from the parent and child types
 * passed.
 */
static void
dpo_stack_i (u32 edge,
             dpo_id_t *dpo,
             const dpo_id_t *parent)
{
    /*
     * in order to get an atomic update of the parent we create a temporary,
     * from a copy of the child, and add the next_node. then we copy to the parent
     */
    dpo_id_t tmp = DPO_INVALID;
    dpo_copy(&tmp, parent);

    /*
     * get the edge index for the parent to child VLIB graph transisition
     */
    tmp.dpoi_next_node = edge;

    /*
     * this update is atomic.
     */
    dpo_copy(dpo, &tmp);

    dpo_reset(&tmp);
}

/**
 * @brief Stack one DPO object on another, and thus establish a child-parent
 * relationship. The VLIB graph arc used is taken from the parent and child types
 * passed.
 */
void
dpo_stack (dpo_type_t child_type,
           dpo_proto_t child_proto,
           dpo_id_t *dpo,
           const dpo_id_t *parent)
{
    dpo_stack_i(dpo_get_next_node(child_type, child_proto, parent), dpo, parent);
}

/**
 * @brief Stack one DPO object on another, and thus establish a child parent
 * relationship. A new VLIB graph arc is created from the child node passed
 * to the nodes registered by the parent. The VLIB infra will ensure this arc
 * is added only once.
 */
void
dpo_stack_from_node (u32 child_node_index,
                     dpo_id_t *dpo,
                     const dpo_id_t *parent)
{
    dpo_proto_t parent_proto;
    vlib_node_t *parent_node;
    dpo_type_t parent_type;
    vlib_main_t *vm;
    u32 edge;

    parent_type = parent->dpoi_type;
    parent_proto = parent->dpoi_proto;

    vm = vlib_get_main();

    ASSERT(NULL != dpo_nodes[parent_type]);
    ASSERT(NULL != dpo_nodes[parent_type][parent_proto]);

    parent_node =
        vlib_get_node_by_name(vm, (u8*) dpo_nodes[parent_type][parent_proto][0]);

    edge = vlib_node_get_next(vm,
                              child_node_index,
                              parent_node->index);

    if (~0 == edge)
    {
        vlib_worker_thread_barrier_sync(vm);

        edge = vlib_node_add_next(vm,
                                  child_node_index,
                                  parent_node->index);

        vlib_worker_thread_barrier_release(vm);
    }

    dpo_stack_i(edge, dpo, parent);
}

static clib_error_t *
dpo_module_init (vlib_main_t * vm)
{
    drop_dpo_module_init();
    punt_dpo_module_init();
    receive_dpo_module_init();
    load_balance_module_init();
    mpls_label_dpo_module_init();
    classify_dpo_module_init();
    lookup_dpo_module_init();
    ip_null_dpo_module_init();
    replicate_module_init();
    interface_dpo_module_init();
    mpls_disp_dpo_module_init();

    return (NULL);
}

VLIB_INIT_FUNCTION(dpo_module_init);

static clib_error_t *
dpo_memory_show (vlib_main_t * vm,
		 unformat_input_t * input,
		 vlib_cli_command_t * cmd)
{
    dpo_vft_t *vft;

    vlib_cli_output (vm, "DPO memory");
    vlib_cli_output (vm, "%=30s %=5s %=8s/%=9s   totals",
		     "Name","Size", "in-use", "allocated");

    vec_foreach(vft, dpo_vfts)
    {
	if (NULL != vft->dv_mem_show)
	    vft->dv_mem_show();
    }

    return (NULL);
}

/* *INDENT-OFF* */
/*?
 * The '<em>sh dpo memory </em>' command displays the memory usage for each
 * data-plane object type.
 *
 * @cliexpar
 * @cliexstart{show dpo memory}
 * DPO memory
 *             Name               Size  in-use /allocated   totals
 *         load-balance            64     12   /    12      768/768
 *           Adjacency            256      1   /    1       256/256
 *            Receive              24      5   /    5       120/120
 *            Lookup               12      0   /    0       0/0
 *           Classify              12      0   /    0       0/0
 *          MPLS label             24      0   /    0       0/0
 * @cliexend
?*/
VLIB_CLI_COMMAND (show_fib_memory, static) = {
    .path = "show dpo memory",
    .function = dpo_memory_show,
    .short_help = "show dpo memory",
};
/* *INDENT-ON* */