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/*
* node.c - - awkward chained buffer geometry test tool
*
* Copyright (c) 2019 by 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 <vppinfra/error.h>
#include <oddbuf/oddbuf.h>
typedef struct
{
u32 sw_if_index;
u32 next_index;
u16 udp_checksum;
} oddbuf_trace_t;
#ifndef CLIB_MARCH_VARIANT
/* packet trace format function */
static u8 *
format_oddbuf_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 *);
oddbuf_trace_t *t = va_arg (*args, oddbuf_trace_t *);
s = format (s, "ODDBUF: sw_if_index %d, next index %d, udp checksum %04x\n",
t->sw_if_index, t->next_index, (u32) t->udp_checksum);
return s;
}
vlib_node_registration_t oddbuf_node;
#endif /* CLIB_MARCH_VARIANT */
#define foreach_oddbuf_error \
_(SWAPPED, "Mac swap packets processed")
typedef enum
{
#define _(sym,str) ODDBUF_ERROR_##sym,
foreach_oddbuf_error
#undef _
ODDBUF_N_ERROR,
} oddbuf_error_t;
#ifndef CLIB_MARCH_VARIANT
static char *oddbuf_error_strings[] = {
#define _(sym,string) string,
foreach_oddbuf_error
#undef _
};
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
ODDBUF_NEXT_DROP,
ODDBUF_N_NEXT,
} oddbuf_next_t;
always_inline uword
oddbuf_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame,
int is_ip4, int is_trace)
{
oddbuf_main_t *om = &oddbuf_main;
u32 n_left_from, *from;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
vlib_buffer_t *b0, *b0next;
u32 bi;
u16 nexts[VLIB_FRAME_SIZE], *next;
u16 save_current_length;
u32 next0;
u8 *src, *dst;
int i;
ethernet_header_t *eh;
ip4_header_t *ip;
udp_header_t *udp;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
b = bufs;
next = nexts;
while (n_left_from > 0)
{
b0 = b[0];
vnet_feature_next (&next0, b0);
nexts[0] = next0;
if (vlib_buffer_alloc (vm, &bi, 1) != 1)
{
clib_warning ("Buffer alloc fail, skipping");
goto skip;
}
if (om->first_chunk_offset)
{
memmove (b0->data + b0->current_data + om->first_chunk_offset,
b0->data + b0->current_data, b0->current_length);
b0->current_data += om->first_chunk_offset;
}
eh = vlib_buffer_get_current (b0);
ip = (ip4_header_t *) (eh + 1);
udp = (udp_header_t *) (ip4_next_header (ip));
if (1)
{
save_current_length = vlib_buffer_length_in_chain (vm, b0);
b0next = vlib_get_buffer (vm, bi);
b0->flags |= VLIB_BUFFER_NEXT_PRESENT;
b0->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
b0->next_buffer = bi;
src = b0->data + b0->current_data + b0->current_length -
om->n_to_copy;
b0next->current_data = om->second_chunk_offset;
b0next->current_length = om->n_to_copy;
dst = b0next->data + b0next->current_data;
for (i = 0; i < om->n_to_copy; i++)
dst[i] = src[i];
b0->current_length -= om->n_to_copy;
b0next->current_length = om->n_to_copy;
if (vlib_buffer_length_in_chain (vm, b0) != save_current_length)
clib_warning ("OOPS, length incorrect after chunk split...");
}
udp->checksum = 0;
udp->checksum = ip4_tcp_udp_compute_checksum (vm, b0, ip);
if (is_trace)
{
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
{
oddbuf_trace_t *t =
vlib_add_trace (vm, node, b[0], sizeof (*t));
t->next_index = next[0];
t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
t->udp_checksum = clib_net_to_host_u16 (udp->checksum);
}
}
skip:
b += 1;
next += 1;
n_left_from -= 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
return frame->n_vectors;
}
VLIB_NODE_FN (oddbuf_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
return oddbuf_inline (vm, node, frame, 1 /* is_ip4 */ ,
1 /* is_trace */ );
else
return oddbuf_inline (vm, node, frame, 1 /* is_ip4 */ ,
0 /* is_trace */ );
}
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE (oddbuf_node) =
{
.name = "oddbuf",
.vector_size = sizeof (u32),
.format_trace = format_oddbuf_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(oddbuf_error_strings),
.error_strings = oddbuf_error_strings,
.n_next_nodes = ODDBUF_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[ODDBUF_NEXT_DROP] = "error-drop",
},
};
#endif /* CLIB_MARCH_VARIANT */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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