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/*
* Copyright (c) 2024 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/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
#include <pvti/pvti.h>
#include <pvti/pvti_if.h>
#include <pvti/bypass.h>
always_inline u16
pvti_bypass_node_common (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, bool is_ip6)
{
u32 n_left_from, *from, *to_next;
pvti_bypass_next_t next_index;
vlib_node_runtime_t *error_node =
vlib_node_get_runtime (vm, ip4_input_node.index);
u32 pkts_processed = 0;
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)
{
vlib_buffer_t *b0;
u32 sw_if_index0 = 0;
ip4_header_t *ip40;
ip6_header_t *ip60;
udp_header_t *udp0;
u32 bi0, ip_len0, udp_len0, flags0, next0;
u8 error0, good_udp0, proto0;
i32 len_diff0;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
/* setup the packet for the next feature */
vnet_feature_next (&next0, b0);
if (is_ip6)
{
ip60 = vlib_buffer_get_current (b0);
}
else
{
ip40 = vlib_buffer_get_current (b0);
}
if (is_ip6)
{
proto0 = ip60->protocol;
}
else
{
/* Treat IP frag packets as "experimental" protocol for now */
proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol;
}
/* Process packet 0 */
if (proto0 != IP_PROTOCOL_UDP)
goto exit; /* not UDP packet */
if (is_ip6)
udp0 = ip6_next_header (ip60);
else
udp0 = ip4_next_header (ip40);
/* look up the destination ip and port */
u32 pvti_index0 = INDEX_INVALID;
if (is_ip6)
{
pvti_index0 = pvti_if_find_by_remote_ip6_and_port (
&ip60->src_address, clib_net_to_host_u16 (udp0->src_port));
}
else
{
pvti_index0 = pvti_if_find_by_remote_ip4_and_port (
&ip40->src_address, clib_net_to_host_u16 (udp0->src_port));
}
if (pvti_index0 == INDEX_INVALID)
goto exit;
flags0 = b0->flags;
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
/* Don't verify UDP checksum for packets with explicit zero checksum.
*/
good_udp0 |= udp0->checksum == 0;
/* Verify UDP length */
if (is_ip6)
ip_len0 = clib_net_to_host_u16 (ip60->payload_length);
else
ip_len0 = clib_net_to_host_u16 (ip40->length);
udp_len0 = clib_net_to_host_u16 (udp0->length);
len_diff0 = ip_len0 - udp_len0;
/* Verify UDP checksum */
if (PREDICT_FALSE (!good_udp0))
{
if (is_ip6)
flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0);
else
flags0 = ip4_tcp_udp_validate_checksum (vm, b0);
good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0;
}
if (is_ip6)
{
error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH;
}
else
{
error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM;
error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH;
}
next0 = error0 ? PVTI_BYPASS_NEXT_DROP : PVTI_BYPASS_NEXT_PVTI_INPUT;
b0->error = error0 ? error_node->errors[error0] : 0;
/* pvtiX-input node expect current at PVTI header */
if (is_ip6)
vlib_buffer_advance (b0, sizeof (ip6_header_t) +
sizeof (udp_header_t));
else
vlib_buffer_advance (b0, sizeof (ip4_header_t) +
sizeof (udp_header_t));
exit:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b0->flags & VLIB_BUFFER_IS_TRACED)))
{
pvti_bypass_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
t->seq = 0; // clib_net_to_host_u32 (pvti0->seq);
if (is_ip6)
{
}
else
{
t->remote_ip.ip.ip4 = ip40->src_address;
t->remote_ip.version = AF_IP4;
}
// t->local_port = h0->udp.dst_port;
// t->remote_port = h0->udp.src_port;
}
pkts_processed += 1;
/* 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, node->node_index,
PVTI_BYPASS_ERROR_PROCESSED, pkts_processed);
return frame->n_vectors;
}
VLIB_NODE_FN (pvti4_bypass_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return pvti_bypass_node_common (vm, node, frame, 0);
}
VLIB_NODE_FN (pvti6_bypass_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return pvti_bypass_node_common (vm, node, frame, 1);
}
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