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/*
* Copyright (c) 2017 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/dns/dns.h>
#include <vlib/vlib.h>
#include <vnet/vnet.h>
vlib_node_registration_t dns46_reply_node;
typedef struct
{
u32 pool_index;
u32 disposition;
} dns46_reply_trace_t;
/* packet trace format function */
static u8 *
format_dns46_reply_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 *);
dns46_reply_trace_t *t = va_arg (*args, dns46_reply_trace_t *);
s = format (s, "DNS46_REPLY: pool index %d, disposition %d",
t->pool_index, t->disposition);
return s;
}
vlib_node_registration_t dns46_reply_node;
static char *dns46_reply_error_strings[] = {
#define _(sym,string) string,
foreach_dns46_reply_error
#undef _
};
typedef enum
{
DNS46_REPLY_NEXT_DROP,
DNS46_REPLY_NEXT_PUNT,
DNS46_REPLY_N_NEXT,
} dns46_reply_next_t;
static uword
dns46_reply_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
dns46_reply_next_t next_index;
dns_main_t *dm = &dns_main;
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);
#if 0
while (n_left_from >= 4 && n_left_to_next >= 2)
{
u32 next0 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
u32 next1 = DNS46_REPLY_NEXT_INTERFACE_OUTPUT;
u32 sw_if_index0, sw_if_index1;
u8 tmp0[6], tmp1[6];
ethernet_header_t *en0, *en1;
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
/* Prefetch next iteration. */
{
vlib_buffer_t *p2, *p3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
vlib_prefetch_buffer_header (p2, LOAD);
vlib_prefetch_buffer_header (p3, LOAD);
CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
}
/* speculatively enqueue b0 and b1 to the current next frame */
to_next[0] = bi0 = from[0];
to_next[1] = bi1 = from[1];
from += 2;
to_next += 2;
n_left_from -= 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* $$$$$ End of processing 2 x packets $$$$$ */
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
{
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
dns46_reply_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = sw_if_index0;
t->next_index = next0;
}
if (b1->flags & VLIB_BUFFER_IS_TRACED)
{
dns46_reply_trace_t *t =
vlib_add_trace (vm, node, b1, sizeof (*t));
t->sw_if_index = sw_if_index1;
t->next_index = next1;
}
}
/* verify speculative enqueues, maybe switch current next frame */
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
#endif
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = DNS46_REPLY_NEXT_DROP;
dns_header_t *d0;
u32 pool_index0 = ~0;
u32 error0 = 0;
u8 *resp0 = 0;
/* 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);
d0 = vlib_buffer_get_current (b0);
if (PREDICT_FALSE (dm->is_enabled == 0))
{
next0 = DNS46_REPLY_NEXT_PUNT;
error0 = DNS46_REPLY_ERROR_DISABLED;
goto done0;
}
pool_index0 = clib_host_to_net_u16 (d0->id);
/* Save the reply */
vec_validate (resp0, vlib_buffer_length_in_chain (vm, b0) - 1);
clib_memcpy_fast (resp0, d0, vlib_buffer_length_in_chain (vm, b0));
/*
* Deal with everything in process ctx on the main thread
*/
vlib_process_signal_event_mt (vm, dns_resolver_node.index,
DNS_RESOLVER_EVENT_RESOLVED,
(uword) resp0);
error0 = DNS46_REPLY_ERROR_PROCESSED;
done0:
b0->error = node->errors[error0];
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
dns46_reply_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->disposition = error0;
t->pool_index = pool_index0;
}
/* 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);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (dns46_reply_node) =
{
.function = dns46_reply_node_fn,
.name = "dns46_reply",
.vector_size = sizeof (u32),
.format_trace = format_dns46_reply_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (dns46_reply_error_strings),
.error_strings = dns46_reply_error_strings,
.n_next_nodes = DNS46_REPLY_N_NEXT,
.next_nodes = {
[DNS46_REPLY_NEXT_DROP] = "error-drop",
[DNS46_REPLY_NEXT_PUNT] = "error-punt",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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