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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)
{
u32 * from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, * to_next, next_index;
u32 cpu_index = os_get_cpu_number();
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, 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 only writing on simple Ethernet header. */
vnet_rewrite_one_header (adj0[0], h0,
sizeof (ethernet_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;
vlib_increment_combined_counter(&adjacency_counters,
cpu_index,
adj_index0,
/* packet increment */ 0,
/* byte increment */ rw_len0);
/* Check MTU of outgoing interface. */
if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <=
adj0[0].rewrite_header.max_l3_packet_bytes)))
{
/* Don't adjust the buffer for ttl issue; icmp-error node wants
* to see the IP headerr */
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);
}
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
*/
vnet_feature_arc_start(em->output_feature_arc_index, tx_sw_if_index0, &next0, p0);
}
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;
}
static uword
adj_l2_rewrite (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return adj_l2_rewrite_inline (vm, node, frame, 0);
}
static uword
adj_l2_midchain (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return adj_l2_rewrite_inline (vm, node, frame, 1);
}
VLIB_REGISTER_NODE (adj_l2_rewrite_node) = {
.function = adj_l2_rewrite,
.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_NODE_FUNCTION_MULTIARCH (adj_l2_rewrite_node, adj_l2_rewrite)
VLIB_REGISTER_NODE (adj_l2_midchain_node) = {
.function = adj_l2_midchain,
.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",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (adj_l2_midchain_node, adj_l2_midchain)
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