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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 "interest_pcslookup.h"
#include "mgmt.h"
#include "parser.h"
#include "infra.h"
#include "strategy_dpo_manager.h"
#include "error.h"
#include "state.h"
/**
* @FILE This node performs a lookup in the PIT and CS for a received interest
* packet.
*
* This node passes the packet to the interest-hitpit and interest-hitcs nodes
* when there is a hit in the pit or content store, respectively.
*/
/* Functions declarations */
/* packet trace format function */
static u8 *hicn_interest_pcslookup_format_trace (u8 *s, va_list *args);
/* Stats string values */
static char *hicn_interest_pcslookup_error_strings[] = {
#define _(sym, string) string,
foreach_hicnfwd_error
#undef _
};
vlib_node_registration_t hicn_interest_pcslookup_node;
/*
* ICN forwarder node for interests: handling of Interests delivered based on
* ACL. - 1 packet at a time - ipv4/tcp ipv6/tcp
*/
static uword
hicn_interest_pcslookup_node_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
int ret;
u32 n_left_from, *from, *to_next;
hicn_interest_pcslookup_next_t next_index;
hicn_interest_pcslookup_runtime_t *rt;
vl_api_hicn_api_node_stats_get_reply_t stats = { 0 };
vlib_buffer_t *b0;
u32 bi0;
u32 next0 = HICN_INTEREST_PCSLOOKUP_NEXT_ERROR_DROP;
hicn_pcs_entry_t *pcs_entry = NULL;
rt = vlib_node_get_runtime_data (vm, hicn_interest_pcslookup_node.index);
if (PREDICT_FALSE (rt->pitcs == NULL))
{
rt->pitcs = &hicn_main.pitcs;
}
from = vlib_frame_vector_args (frame);
n_left_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 > 0 && n_left_to_next > 0)
{
/* Prefetch for next iteration. */
if (n_left_from > 1)
{
vlib_buffer_t *b1;
b1 = vlib_get_buffer (vm, from[1]);
CLIB_PREFETCH (b1, CLIB_CACHE_LINE_BYTES, STORE);
}
// Dequeue a packet buffer
bi0 = from[0];
from += 1;
n_left_from -= 1;
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
// By default we send the interest to strategy node
next0 = HICN_INTEREST_PCSLOOKUP_NEXT_STRATEGY;
// Update stats
stats.pkts_processed++;
// Check if the interest is in the PCS already
ret = hicn_pcs_lookup_one (rt->pitcs, &hicn_get_buffer (b0)->name,
&pcs_entry);
if (ret == HICN_ERROR_NONE)
{
// We found an entry in the PCS. Next stage for this packet is
// one of hitpit/cs nodes
next0 = HICN_INTEREST_PCSLOOKUP_NEXT_INTEREST_HITPIT +
hicn_pcs_entry_is_cs (pcs_entry);
ret = hicn_store_internal_state (
b0, hicn_pcs_entry_get_index (rt->pitcs, pcs_entry),
vnet_buffer (b0)->ip.adj_index[VLIB_TX]);
if (PREDICT_FALSE (ret != HICN_ERROR_NONE))
next0 = HICN_INTEREST_PCSLOOKUP_NEXT_ERROR_DROP;
}
stats.pkts_interest_count++;
// Maybe trace
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b0->flags & VLIB_BUFFER_IS_TRACED)))
{
hicn_interest_pcslookup_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->pkt_type = HICN_PACKET_TYPE_INTEREST;
t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
t->next_index = next0;
}
/*
* 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);
}
u32 pit_int_count = hicn_pcs_get_pit_count (rt->pitcs);
u32 pit_cs_count = hicn_pcs_get_cs_count (rt->pitcs);
vlib_node_increment_counter (vm, hicn_interest_pcslookup_node.index,
HICNFWD_ERROR_PROCESSED, stats.pkts_processed);
vlib_node_increment_counter (vm, hicn_interest_pcslookup_node.index,
HICNFWD_ERROR_INTERESTS,
stats.pkts_interest_count);
update_node_counter (vm, hicn_interest_pcslookup_node.index,
HICNFWD_ERROR_INT_COUNT, pit_int_count);
update_node_counter (vm, hicn_interest_pcslookup_node.index,
HICNFWD_ERROR_CS_COUNT, pit_cs_count);
return (frame->n_vectors);
}
/* packet trace format function */
static u8 *
hicn_interest_pcslookup_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 *);
const hicn_interest_pcslookup_trace_t *t =
va_arg (*args, hicn_interest_pcslookup_trace_t *);
s = format (s, "INTEREST_PCSLOOKUP: 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 interest forwarder node
*/
VLIB_REGISTER_NODE(hicn_interest_pcslookup_node) =
{
.function = hicn_interest_pcslookup_node_fn,
.name = "hicn-interest-pcslookup",
.vector_size = sizeof(u32),
.runtime_data_bytes = sizeof(hicn_interest_pcslookup_runtime_t),
.format_trace = hicn_interest_pcslookup_format_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(hicn_interest_pcslookup_error_strings),
.error_strings = hicn_interest_pcslookup_error_strings,
.n_next_nodes = HICN_INTEREST_PCSLOOKUP_N_NEXT,
.next_nodes =
{
[HICN_INTEREST_PCSLOOKUP_NEXT_STRATEGY] = "hicn-strategy",
[HICN_INTEREST_PCSLOOKUP_NEXT_INTEREST_HITPIT] = "hicn-interest-hitpit",
[HICN_INTEREST_PCSLOOKUP_NEXT_INTEREST_HITCS] = "hicn-interest-hitcs",
[HICN_INTEREST_PCSLOOKUP_NEXT_ERROR_DROP] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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