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/*
* Copyright (c) 2016 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/vnet.h>
#include <vnet/adj/adj_l2.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/ip.h>
/**
* @brief Trace data for a L2 Midchain
*/
typedef struct adj_l2_trace_t_ {
/** Adjacency index taken. */
u32 adj_index;
} adj_l2_trace_t;
static u8 *
format_adj_l2_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 *);
adj_l2_trace_t * t = va_arg (*args, adj_l2_trace_t *);
s = format (s, "adj-idx %d : %U",
t->adj_index,
format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE);
return s;
}
typedef enum adj_l2_rewrite_next_t_
{
ADJ_L2_REWRITE_NEXT_DROP,
} adj_l2_rewrite_next_t;
always_inline uword
adj_l2_rewrite_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
int is_midchain,
int do_counters)
{
u32 * from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, * to_next, next_index;
u32 thread_index = vlib_get_thread_index();
ethernet_main_t * em = ðernet_main;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
ip_adjacency_t * adj0;
vlib_buffer_t * p0;
char *h0;
u32 pi0, rw_len0, len0, adj_index0, next0 = 0;
u32 tx_sw_if_index0;
pi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next += 1;
n_left_to_next -= 1;
p0 = vlib_get_buffer (vm, pi0);
h0 = vlib_buffer_get_current (p0);
adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
adj0 = adj_get (adj_index0);
/* Guess we are writing on ip4 header. */
vnet_rewrite_one_header (adj0[0], h0,
//sizeof (gre_header_t) +
sizeof (ip4_header_t));
/* Update packet buffer attributes/set output interface. */
rw_len0 = adj0[0].rewrite_header.data_bytes;
vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
vnet_buffer(p0)->sw_if_index[VLIB_TX] = adj0->rewrite_header.sw_if_index;
len0 = vlib_buffer_length_in_chain (vm, p0);
/* since we are coming out of the L2 world, where the vlib_buffer
* union is used for other things, make sure it is clean for
* MPLS from now on.
*/
vnet_buffer(p0)->mpls.first = 0;
if (do_counters)
vlib_increment_combined_counter(&adjacency_counters,
thread_index,
adj_index0,
0, len0);
/* Check MTU of outgoing interface. */
if (PREDICT_TRUE(len0 <= adj0[0].rewrite_header.max_l3_packet_bytes))
{
/* Don't adjust the buffer for ttl issue; icmp-error node wants
* to see the IP header */
p0->current_data -= rw_len0;
p0->current_length += rw_len0;
tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
if (is_midchain)
{
adj0->sub_type.midchain.fixup_func(
vm, adj0, p0,
adj0->sub_type.midchain.fixup_data);
}
vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
/*
* Follow the feature ARC. this will result eventually in
* the midchain-tx node
*/
if (PREDICT_FALSE (adj0->rewrite_header.flags &
VNET_REWRITE_HAS_FEATURES))
vnet_feature_arc_start_w_cfg_index (
em->output_feature_arc_index,
tx_sw_if_index0,
&next0, p0,
adj0->ia_cfg_index);
else
next0 = adj0[0].rewrite_header.next_index;
}
else
{
/* can't fragment L2 */
next0 = ADJ_L2_REWRITE_NEXT_DROP;
}
if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
{
adj_l2_trace_t *tr = vlib_add_trace (vm, node,
p0, sizeof (*tr));
tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
pi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
VLIB_NODE_FN (adj_l2_rewrite_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return adj_l2_rewrite_inline (vm, node, frame, 0, 1);
else
return adj_l2_rewrite_inline (vm, node, frame, 0, 0);
}
VLIB_NODE_FN (adj_l2_midchain_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (adj_are_counters_enabled ())
return adj_l2_rewrite_inline (vm, node, frame, 1, 1);
else
return adj_l2_rewrite_inline (vm, node, frame, 1, 0);
}
VLIB_REGISTER_NODE (adj_l2_rewrite_node) = {
.name = "adj-l2-rewrite",
.vector_size = sizeof (u32),
.format_trace = format_adj_l2_trace,
.n_next_nodes = 1,
.next_nodes = {
[ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",
},
};
VLIB_REGISTER_NODE (adj_l2_midchain_node) = {
.name = "adj-l2-midchain",
.vector_size = sizeof (u32),
.format_trace = format_adj_l2_trace,
.n_next_nodes = 1,
.next_nodes = {
[ADJ_L2_REWRITE_NEXT_DROP] = "error-drop",
},
};
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