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/*
* l2e_node.c : l2 emulation node
*
* Copyright (c) 2019 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 <plugins/l2e/l2e.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>
#define foreach_l2_emulation \
_(IP4, "Extract IPv4") \
_(IP6, "Extract IPv6")
typedef enum
{
#define _(sym,str) L2_EMULATION_ERROR_##sym,
foreach_l2_emulation
#undef _
L2_EMULATION_N_ERROR,
} l2_emulation_error_t;
static char *l2_emulation_error_strings[] = {
#define _(sym,string) string,
foreach_l2_emulation
#undef _
};
typedef enum
{
#define _(sym,str) L2_EMULATION_NEXT_##sym,
foreach_l2_emulation
#undef _
L2_EMULATION_N_NEXT,
} l2_emulation_next_t;
/* packet trace format function */
static u8 *
format_l2_emulation_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 *);
l2_emulation_trace_t *t = va_arg (*args, l2_emulation_trace_t *);
s = format (s, "l2-emulation: %s", (t->extracted ? "yes" : "no"));
return s;
}
VLIB_NODE_FN (l2_emulation_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
l2_emulation_main_t *em = &l2_emulation_main;
u32 n_left_from, *from, *to_next;
l2_emulation_next_t next_index;
u32 ip4_hits = 0;
u32 ip6_hits = 0;
next_index = 0;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
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 >= 4 && n_left_to_next >= 2)
{
vlib_buffer_t *b0, *b1;
u32 sw_if_index0, sw_if_index1;
u16 ether_type0, ether_type1;
u32 next0 = ~0, next1 = ~0;
u8 l2_len0, l2_len1;
u32 bi0, bi1;
u8 *h0, *h1;
bi0 = to_next[0] = from[0];
bi1 = to_next[1] = from[1];
from += 2;
n_left_from -= 2;
to_next += 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
l2_len0 = vnet_buffer (b0)->l2.l2_len;
l2_len1 = vnet_buffer (b1)->l2.l2_len;
h0 = vlib_buffer_get_current (b0);
h1 = vlib_buffer_get_current (b1);
ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
ether_type1 = clib_net_to_host_u16 (*(u16 *) (h1 + l2_len1 - 2));
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
/*
* only extract unicast
*/
if (PREDICT_TRUE (!(h0[0] & 0x1)))
{
switch (ether_type0)
{
case ETHERNET_TYPE_IP4:
ASSERT (em->l2_emulations[sw_if_index0].enabled);
++ip4_hits;
next0 = L2_EMULATION_NEXT_IP4;
vlib_buffer_advance (b0, l2_len0);
break;
case ETHERNET_TYPE_IP6:
ASSERT (em->l2_emulations[sw_if_index0].enabled);
++ip6_hits;
next0 = L2_EMULATION_NEXT_IP6;
vlib_buffer_advance (b0, l2_len0);
default:
break;
}
}
if (PREDICT_TRUE (!(h1[0] & 0x1)))
{
switch (ether_type1)
{
case ETHERNET_TYPE_IP4:
ASSERT (em->l2_emulations[sw_if_index1].enabled);
++ip4_hits;
next1 = L2_EMULATION_NEXT_IP4;
vlib_buffer_advance (b1, l2_len1);
break;
case ETHERNET_TYPE_IP6:
ASSERT (em->l2_emulations[sw_if_index1].enabled);
++ip6_hits;
next1 = L2_EMULATION_NEXT_IP6;
vlib_buffer_advance (b1, l2_len1);
default:
break;
}
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
l2_emulation_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->extracted = (next0 != ~0);
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b1->flags & VLIB_BUFFER_IS_TRACED)))
{
l2_emulation_trace_t *t =
vlib_add_trace (vm, node, b1, sizeof (*t));
t->extracted = (next1 != ~0);
}
/* Determine the next node and remove ourself from bitmap */
if (PREDICT_TRUE (next0 == ~0))
next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
L2INPUT_FEAT_L2_EMULATION);
/* Determine the next node and remove ourself from bitmap */
if (PREDICT_TRUE (next1 == ~0))
next1 = vnet_l2_feature_next (b1, em->l2_input_feat_next,
L2INPUT_FEAT_L2_EMULATION);
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
vlib_buffer_t *b0;
u32 sw_if_index0;
u16 ether_type0;
u32 next0 = ~0;
u8 l2_len0;
u32 bi0;
u8 *h0;
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);
l2_len0 = vnet_buffer (b0)->l2.l2_len;
h0 = vlib_buffer_get_current (b0);
ether_type0 = clib_net_to_host_u16 (*(u16 *) (h0 + l2_len0 - 2));
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
/*
* only extract unicast
*/
if (PREDICT_TRUE (!(h0[0] & 0x1)))
{
switch (ether_type0)
{
case ETHERNET_TYPE_IP4:
ASSERT (em->l2_emulations[sw_if_index0].enabled);
++ip4_hits;
next0 = L2_EMULATION_NEXT_IP4;
vlib_buffer_advance (b0, l2_len0);
break;
case ETHERNET_TYPE_IP6:
ASSERT (em->l2_emulations[sw_if_index0].enabled);
++ip6_hits;
next0 = L2_EMULATION_NEXT_IP6;
vlib_buffer_advance (b0, l2_len0);
default:
break;
}
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
l2_emulation_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->extracted = (next0 != ~0);
}
/* Determine the next node and remove ourself from bitmap */
if (PREDICT_TRUE (next0 == ~0))
next0 = vnet_l2_feature_next (b0, em->l2_input_feat_next,
L2INPUT_FEAT_L2_EMULATION);
/* 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);
}
vlib_node_increment_counter (vm, node->node_index,
L2_EMULATION_ERROR_IP4, ip4_hits);
vlib_node_increment_counter (vm, node->node_index,
L2_EMULATION_ERROR_IP6, ip6_hits);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2_emulation_node) = {
.name = "l2-emulation",
.vector_size = sizeof (u32),
.format_trace = format_l2_emulation_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(l2_emulation_error_strings),
.error_strings = l2_emulation_error_strings,
.n_next_nodes = L2_EMULATION_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[L2_EMULATION_NEXT_IP4] = "ip4-input",
[L2_EMULATION_NEXT_IP6] = "ip6-input",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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