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/*
* Copyright (c) 2018 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 <nat/dslite/dslite.h>
#include <nat/nat_inlines.h>
typedef enum
{
DSLITE_CE_DECAP_NEXT_IP4_LOOKUP,
DSLITE_IN2OUT_NEXT_IP6_ICMP,
DSLITE_CE_DECAP_NEXT_DROP,
DSLITE_CE_DECAP_N_NEXT,
} dslite_ce_decap_next_t;
static char *dslite_ce_decap_error_strings[] = {
#define _(sym,string) string,
foreach_dslite_error
#undef _
};
VLIB_NODE_FN (dslite_ce_decap_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
dslite_ce_decap_next_t next_index;
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)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = DSLITE_CE_DECAP_NEXT_IP4_LOOKUP;
u8 error0 = DSLITE_ERROR_CE_DECAP;
ip4_header_t *ip40;
ip6_header_t *ip60;
u32 proto0;
/* 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);
ip60 = vlib_buffer_get_current (b0);
if (PREDICT_FALSE (ip60->protocol != IP_PROTOCOL_IP_IN_IP))
{
if (ip60->protocol == IP_PROTOCOL_ICMP6)
{
next0 = DSLITE_IN2OUT_NEXT_IP6_ICMP;
goto trace0;
}
error0 = DSLITE_ERROR_BAD_IP6_PROTOCOL;
next0 = DSLITE_CE_DECAP_NEXT_DROP;
goto trace0;
}
ip40 = vlib_buffer_get_current (b0) + sizeof (ip6_header_t);
proto0 = ip_proto_to_snat_proto (ip40->protocol);
if (PREDICT_FALSE (proto0 == ~0))
{
error0 = DSLITE_ERROR_UNSUPPORTED_PROTOCOL;
next0 = DSLITE_CE_DECAP_NEXT_DROP;
goto trace0;
}
ip40->tos =
(clib_net_to_host_u32
(ip60->ip_version_traffic_class_and_flow_label) & 0x0ff00000) >>
20;
vlib_buffer_advance (b0, sizeof (ip6_header_t));
trace0:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
dslite_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
t->next_index = next0;
}
b0->error = node->errors[error0];
/* 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 (dslite_ce_decap_node) = {
.name = "dslite-ce-decap",
.vector_size = sizeof (u32),
.format_trace = format_dslite_ce_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (dslite_ce_decap_error_strings),
.error_strings = dslite_ce_decap_error_strings,
.n_next_nodes = DSLITE_CE_DECAP_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[DSLITE_CE_DECAP_NEXT_DROP] = "error-drop",
[DSLITE_CE_DECAP_NEXT_IP4_LOOKUP] = "ip4-lookup",
[DSLITE_IN2OUT_NEXT_IP6_ICMP] = "ip6-icmp-input",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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