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/*
* Copyright (c) 2023 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 <vlib/vlib.h>
#include <vnet/feature/feature.h>
#include <vnet/classify/pcap_classify.h>
typedef struct
{
u32 sw_if_index;
} tracenode_trace_t;
static u8 *
format_tracenode_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 *);
vnet_main_t *vnm = vnet_get_main ();
tracenode_trace_t *t = va_arg (*args, tracenode_trace_t *);
s = format (s, "Packet traced from interface %U added",
format_vnet_sw_if_index_name, vnm, t->sw_if_index);
return s;
}
static_always_inline u32
tracenode_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, int is_pcap)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_pcap_t *pp = &vnm->pcap;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
u32 *from = vlib_frame_vector_args (frame), *from0 = from;
const u32 n_tot = frame->n_vectors;
u32 n_left = n_tot;
vlib_get_buffers (vm, from, b, n_tot);
while (n_left > 0)
{
/* TODO: dual/quad loop */
/* enqueue b0 to the current next frame */
vnet_feature_next_u16 (next, b[0]);
/* buffer already traced */
if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED))
goto skip;
if (is_pcap && vnet_is_packet_pcaped (pp, b[0], ~0))
{
pcap_add_buffer (&pp->pcap_main, vm, from0[0],
pp->max_bytes_per_pkt);
}
else if (!is_pcap && vlib_trace_buffer (vm, node, next[0], b[0],
1 /* follow_chain */))
{
tracenode_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof *tr);
tr->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
}
skip:
b++;
from0++;
next++;
n_left--;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_tot);
return n_tot;
}
VLIB_NODE_FN (trace_filtering_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return tracenode_inline (vm, node, frame, 0 /* is_pcap */);
}
VLIB_NODE_FN (pcap_filtering_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return tracenode_inline (vm, node, frame, 1 /* is_pcap */);
}
VLIB_REGISTER_NODE (trace_filtering_node) = {
.name = "trace-filtering",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.format_trace = format_tracenode_trace,
};
VLIB_REGISTER_NODE (pcap_filtering_node) = {
.name = "pcap-filtering",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.format_trace = format_tracenode_trace,
};
VNET_FEATURE_INIT (trace_filtering4, static) = {
.arc_name = "ip4-unicast",
.node_name = "trace-filtering",
.runs_after = VNET_FEATURES ("ip4-full-reassembly-feature",
"ip4-sv-reassembly-feature"),
};
VNET_FEATURE_INIT (trace_filtering6, static) = {
.arc_name = "ip6-unicast",
.node_name = "trace-filtering",
.runs_after = VNET_FEATURES ("ip6-full-reassembly-feature",
"ip6-sv-reassembly-feature"),
};
VNET_FEATURE_INIT (pcap_filtering4, static) = {
.arc_name = "ip4-unicast",
.node_name = "pcap-filtering",
.runs_after = VNET_FEATURES ("ip4-full-reassembly-feature",
"ip4-sv-reassembly-feature"),
};
VNET_FEATURE_INIT (pcap_filtering6, static) = {
.arc_name = "ip6-unicast",
.node_name = "pcap-filtering",
.runs_after = VNET_FEATURES ("ip6-full-reassembly-feature",
"ip6-sv-reassembly-feature"),
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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