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/*
* Copyright (c) 2021 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/ip/ip6_packet.h>
#include <vlib/log.h>
#include "hicn.h"
#include "mapme.h"
#include "mapme_ack.h"
#include "mapme_eventmgr.h"
#include "mgmt.h"
#include "parser.h"
#include "data_fwd.h"
#include "infra.h"
#include "strategy_dpo_manager.h"
#include "error.h"
#include "state.h"
extern hicn_mapme_main_t mapme_main;
/* packet trace format function */
static u8 *hicn_mapme_ack_format_trace (u8 *s, va_list *args);
/* Stats string values */
static char *hicn_mapme_ack_error_strings[] = {
#define _(sym, string) string,
foreach_hicnfwd_error
#undef _
};
/*
* @brief Process incoming ack messages (Interest Update Ack)
* @param vm vlib main data structure
* @param b Control packet (IU)
* @param face_id Ingress face id
*/
bool
hicn_mapme_process_ack (vlib_main_t *vm, vlib_buffer_t *b,
hicn_face_id_t in_face)
{
seq_t fib_seq;
const dpo_id_t *dpo;
hicn_prefix_t prefix;
mapme_params_t params;
int rc;
/* Parse incoming message */
rc = hicn_mapme_parse_packet (vlib_buffer_get_current (b), &prefix, ¶ms);
if (rc < 0)
goto ERR_PARSE;
/* if (params.seq == INVALID_SEQ) */
/* { */
/* DEBUG ("Invalid sequence number found in IU"); */
/* return true; */
/* } */
dpo = fib_epm_lookup (&(prefix.name), prefix.len);
if (!dpo)
{
HICN_ERROR ("Ignored ACK for non-existing FIB entry %U. Ignored.",
format_ip_prefix, &prefix);
return true;
}
/* We are only expecting ACKs for hICN DPOs */
ASSERT (dpo_is_hicn (dpo));
hicn_mapme_tfib_t *tfib = TFIB (hicn_strategy_dpo_ctx_get (dpo->dpoi_index));
if (tfib == NULL)
{
HICN_ERROR ("Unable to get strategy ctx.");
return false;
}
fib_seq = tfib->seq;
/*
* As we always retransmit IU with the latest seq, we are not interested in
* ACKs with inferior seq
*/
if (params.seq < fib_seq)
{
HICN_ERROR ("MAPME: Ignored ACK for low seq");
return true;
}
hicn_mapme_tfib_del (tfib, in_face);
/*
* Is the ingress face in TFIB ? if so, remove it, otherwise it might be a
* duplicate
*/
retx_t *retx = vlib_process_signal_event_data (
vm, hicn_mapme_eventmgr_process_node.index, HICN_MAPME_EVENT_FACE_PH_DEL,
1, sizeof (retx_t));
*retx = (retx_t){ .prefix = prefix, .dpo = *dpo };
return true;
ERR_PARSE:
return false;
}
vlib_node_registration_t hicn_mapme_ack_node;
static uword
hicn_mapme_ack_node_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
hicn_buffer_t *hb;
hicn_mapme_ack_next_t next_index;
u32 n_left_from, *from, *to_next;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0) // buffers in the current frame
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = HICN_MAPME_ACK_NEXT_ERROR_DROP;
u32 sw_if_index0;
/* speculatively enqueue b0 to the current next frame */
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);
vlib_cli_output (vm, "Received IUAck");
hb = hicn_get_buffer (b0);
hicn_mapme_process_ack (vm, b0, hb->face_id);
/* Single loop: process 1 packet here */
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b0->flags & VLIB_BUFFER_IS_TRACED)))
{
hicn_mapme_ack_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
}
/* $$$$$ Done processing 1 packet here $$$$$ */
/* verify speculative enqueue, maybe switch current next frame */
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);
}
// vlib_node_increment_counter (vm, hicn_mapme_ack_node.index,
// HICN_MAPME_ACK_ERROR_SWAPPED, pkts_swapped);
return (frame->n_vectors);
}
/* packet trace format function */
static u8 *
hicn_mapme_ack_format_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 *);
hicn_mapme_ack_trace_t *t = va_arg (*args, hicn_mapme_ack_trace_t *);
s = format (s, "MAPME_ACK: pkt: %d, sw_if_index %d, next index %d",
(int) t->pkt_type, t->sw_if_index, t->next_index);
return (s);
}
/*
* Node registration for the MAP-Me node processing special interests
*/
VLIB_REGISTER_NODE (hicn_mapme_ack_node) =
{
.function = hicn_mapme_ack_node_fn,
.name = "hicn-mapme-ack",
.vector_size = sizeof (u32),
.runtime_data_bytes = sizeof (hicn_mapme_ack_runtime_t),
.format_trace = hicn_mapme_ack_format_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (hicn_mapme_ack_error_strings),
.error_strings = hicn_mapme_ack_error_strings,
.n_next_nodes = HICN_MAPME_ACK_N_NEXT,
.next_nodes =
{
[HICN_MAPME_ACK_NEXT_ERROR_DROP] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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