/*
* Copyright (c) 2015 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <srv6-am/am.h>
/******************************* Packet tracing *******************************/
typedef struct
{
u32
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/*
* Copyright (c) 2015 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.
*/
/*
* l2_classify.c
*/
#include <vnet/l2/l2_classify.h>
#include <vnet/api_errno.h>
/**
* @file
* @brief L2 input classifier.
*
* @sa @ref vnet/vnet/classify/vnet_classify.c
* @sa @ref vnet/vnet/classify/vnet_classify.h
*/
/**
* @brief l2_input_classifier packet trace record.
*/
typedef struct
{
/** interface handle for the ith packet */
u32 sw_if_index;
/** graph arc index selected for this packet */
u32 next_index;
/** classifier table which provided the final result */
u32 table_index;
/** offset in classifier heap of the corresponding session */
u32 session_offset;
} l2_input_classify_trace_t;
/**
* @brief vlib node runtime.
*/
typedef struct
{
/** use-case independent main object pointer */
vnet_classify_main_t *vcm;
/** l2 input classifier main object pointer */
l2_input_classify_main_t *l2cm;
} l2_input_classify_runtime_t;
/** Packet trace format function. */
static u8 *
format_l2_input_classify_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_input_classify_trace_t *t = va_arg (*args, l2_input_classify_trace_t *);
s = format (s, "l2-classify: sw_if_index %d, table %d, offset %x, next %d",
t->sw_if_index, t->table_index, t->session_offset,
t->next_index);
return s;
}
extern l2_input_classify_main_t l2_input_classify_main;
#ifndef CLIB_MARCH_VARIANT
/** l2 input classifier main data structure. */
l2_input_classify_main_t l2_input_classify_main;
#endif /* CLIB_MARCH_VARIANT */
#define foreach_l2_input_classify_error \
_(MISS, "Classify misses") \
_(HIT, "Classify hits") \
_(CHAIN_HIT, "Classify hits after chain walk") \
_(DROP, "L2 Classify Drops")
typedef enum
{
#define _(sym,str) L2_INPUT_CLASSIFY_ERROR_##sym,
foreach_l2_input_classify_error
#undef _
L2_INPUT_CLASSIFY_N_ERROR,
} l2_input_classify_error_t;
static char *l2_input_classify_error_strings[] = {
#define _(sym,string) string,
foreach_l2_input_classify_error
#undef _
};
/**
* @brief l2 input classifier node.
* @node l2-input-classify
*
* This is the l2 input classifier dispatch node
*
* @param vm vlib_main_t corresponding to the current thread.
* @param node vlib_node_runtime_t data for this node.
* @param frame vlib_frame_t whose contents should be dispatched.
*
* @par Graph mechanics: buffer metadata, next index usage
*
* @em Uses:
* - <code>(l2_input_classify_runtime_t *)
* rt->classify_table_index_by_sw_if_index</code>
* - Head of the per-interface, per-protocol classifier table chain
* for a specific interface.
* - @c ~0 => send pkts to the next feature in the L2 feature chain.
* - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
* - Indicates the @c sw_if_index value of the interface that the
* packet was received on.
* - <code>vnet_buffer(b0)->l2.feature_bitmap</code>
* - Used to steer packets across l2 features enabled on the interface
* - <code>(vnet_classify_entry_t) e0->next_index</code>
* - Used to steer traffic when the classifier hits on a session
* - <code>(vnet_classify_entry_t) e0->advance</code>
* - Signed quantity applied via <code>vlib_buffer_advance</code>
* when the classifier hits on a session
* - <code>(vnet_classify_table_t) t0->miss_next_index</code>
* - Used to steer traffic when the classifier misses
*
* @em Sets:
* - <code>vnet_buffer (b0)->l2_classify.table_index</code>
* - Classifier table index of the first classifier table in
* the classifier table chain
* - <code>vnet_buffer (b0)->l2_classify.hash</code>
* - Bounded-index extensible hash corresponding to the
* masked fields in the current packet
* - <code>vnet_buffer (b0)->l2.feature_bitmap</code>
* - Used to steer packets across l2 features enabled on the interface
* - <code>vnet_buffer (b0)->l2_classify.opaque_index</code>
* - Copied from the classifier session object upon classifier hit
*
* @em Counters:
* - <code>L2_INPUT_CLASSIFY_ERROR_MISS</code> Classifier misses
* - <code>L2_INPUT_CLASSIFY_ERROR_HIT</code> Classifier hits
* - <code>L2_INPUT_CLASSIFY_ERROR_CHAIN_HIT</code>
* Classifier hits in other than the first table
*/
VLIB_NODE_FN (l2_input_classify_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
l2_input_classify_next_t next_index;
l2_input_classify_main_t *cm = &l2_input_classify_main;
vnet_classify_main_t *vcm = cm->vnet_classify_main;
l2_input_classify_runtime_t *rt =
(l2_input_classify_runtime_t *) node->runtime_data;
u32 hits = 0;
u32 misses = 0;
u32 chain_hits = 0;
f64 now;
u32 n_next_nodes;
n_next_nodes = node->n_next_nodes;
now = vlib_time_now (vm);
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
/* First pass: compute hash */
while (n_left_from >= 4)
{
vlib_buffer_t *b0, *b1;
u32 bi0, bi1;
ethernet_header_t *h0, *h1;
u32 sw_if_index0, sw_if_index1;
u16 type0, type1;
int type_index0, type_index1;
vnet_classify_table_t *t0, *t1;
u32 table_index0, table_index1;
u64 hash0, hash1;
/* 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, STORE);
clib_prefetch_store (p2->data);
vlib_prefetch_buffer_header (p3, STORE);
clib_prefetch_store (p3->data);
}
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
h0 = vlib_buffer_get_current (b0);
bi1 = from[1];
b1 = vlib_get_buffer (vm, bi1);
h1 = vlib_buffer_get_current (b1);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
vnet_buffer (b0)->l2_classify.table_index = ~0;
sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
vnet_buffer (b1)->l2_classify.table_index = ~0;
/* Select classifier table based on ethertype */
type0 = clib_net_to_host_u16 (h0->type);
type1 = clib_net_to_host_u16 (h1->type);
type_index0 = (type0 == ETHERNET_TYPE_IP4)
? L2_INPUT_CLASSIFY_TABLE_IP4 : L2_INPUT_CLASSIFY_TABLE_OTHER;
type_index0 = (type0 == ETHERNET_TYPE_IP6)
? L2_INPUT_CLASSIFY_TABLE_IP6 : type_index0;
type_index1 = (type1 == ETHERNET_TYPE_IP4)
? L2_INPUT_CLASSIFY_TABLE_IP4 : L2_INPUT_CLASSIFY_TABLE_OTHER;
type_index1 = (type1 == ETHERNET_TYPE_IP6)
? L2_INPUT_CLASSIFY_TABLE_IP6 : type_index1;
vnet_buffer (b0)->l2_classify.table_index =
table_index0 =
rt->l2cm->classify_table_index_by_sw_if_index
[type_index0][sw_if_index0];
if (table_index0 != ~0)
{
t0 = pool_elt_at_index (vcm->tables, table_index0);
vnet_buffer (b0)->l2_classify.hash = hash0 =
vnet_classify_hash_packet (t0, (u8 *) h0);
vnet_classify_prefetch_bucket (t0, hash0);
}
vnet_buffer (b1)->l2_classify.table_index =
table_index1 =
rt->l2cm->classify_table_index_by_sw_if_index
[type_index1][sw_if_index1];
if (table_index1 != ~0)
{
t1 = pool_elt_at_index (vcm->tables, table_index1);
vnet_buffer (b1)->l2_classify.hash = hash1 =
vnet_classify_hash_packet (t1, (u8 *) h1);
vnet_classify_prefetch_bucket (t1, hash1);
}
from += 2;
n_left_from -= 2;
}
while (n_left_from > 0)
{
vlib_buffer_t *b0;
u32 bi0;
ethernet_header_t *h0;
u32 sw_if_index0;
u16 type0;
u32 type_index0;
vnet_classify_table_t *t0;
u32 table_index0;
u64 hash0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
h0 = vlib_buffer_get_current (b0);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
vnet_buffer (b0)->l2_classify.table_index = ~0;
/* Select classifier table based on ethertype */
type0 = clib_net_to_host_u16 (h0->type);
type_index0 = (type0 == ETHERNET_TYPE_IP4)
? L2_INPUT_CLASSIFY_TABLE_IP4 : L2_INPUT_CLASSIFY_TABLE_OTHER;
type_index0 = (type0 == ETHERNET_TYPE_IP6)
? L2_INPUT_CLASSIFY_TABLE_IP6 : type_index0;
vnet_buffer (b0)->l2_classify.table_index =
table_index0 = rt->l2cm->classify_table_index_by_sw_if_index
[type_index0][sw_if_index0];
if (table_index0 != ~0)
{
t0 = pool_elt_at_index (vcm->tables, table_index0);
vnet_buffer (b0)->l2_classify.hash = hash0 =
vnet_classify_hash_packet (t0, (u8 *) h0);
vnet_classify_prefetch_bucket (t0, hash0);
}
from++;
n_left_from--;
}
next_index = node->cached_next_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
/* Not enough load/store slots to dual loop... */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = ~0; /* next l2 input feature, please... */
ethernet_header_t *h0;
u32 table_index0;
u64 hash0;
vnet_classify_table_t *t0;
vnet_classify_entry_t *e0;
if (PREDICT_TRUE (n_left_from > 2))
{
vlib_buffer_t *p2 = vlib_get_buffer (vm, from[2]);
u64 phash2;
u32 table_index2;
vnet_classify_table_t *tp2;
/*
* Prefetch table entry two ahead. Buffer / data
* were prefetched above...
*/
table_index2 = vnet_buffer (p2)->l2_classify.table_index;
if (PREDICT_TRUE (table_index2 != ~0))
{
tp2 = pool_elt_at_index (vcm->tables, table_index2);
phash2 = vnet_buffer (p2)->l2_classify.hash;
vnet_classify_prefetch_entry (tp2, phash2);
}
}
/* 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);
h0 = vlib_buffer_get_current (b0);
table_index0 = vnet_buffer (b0)->l2_classify.table_index;
e0 = 0;
vnet_buffer (b0)->l2_classify.opaque_index = ~0;
if (PREDICT_TRUE (table_index0 != ~0))
{
hash0 = vnet_buffer (b0)->l2_classify.hash;
t0 = pool_elt_at_index (vcm->tables, table_index0);
e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
if (e0)
{
vnet_buffer (b0)->l2_classify.opaque_index
= e0->opaque_index;
vlib_buffer_advance (b0, e0->advance);
next0 = (e0->next_index < n_next_nodes) ?
e0->next_index : next0;
hits++;
}
else
{
while (1)
{
if (t0->next_table_index != ~0)
t0 = pool_elt_at_index (vcm->tables,
t0->next_table_index);
else
{
next0 = (t0->miss_next_index < n_next_nodes) ?
t0->miss_next_index : next0;
misses++;
break;
}
hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
e0 =
vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
if (e0)
{
vnet_buffer (b0)->l2_classify.opaque_index
= e0->opaque_index;
vlib_buffer_advance (b0, e0->advance);
next0 = (e0->next_index < n_next_nodes) ?
e0->next_index : next0;
hits++;
chain_hits++;
break;
}
}
}
}
if (PREDICT_FALSE (next0 == 0))
b0->error = node->errors[L2_INPUT_CLASSIFY_ERROR_DROP];
/* Determine the next node and remove ourself from bitmap */
if (PREDICT_TRUE (next0 == ~0))
next0 = vnet_l2_feature_next (b0, cm->l2_inp_feat_next,
L2INPUT_FEAT_INPUT_CLASSIFY);
else
vnet_buffer (b0)->l2.feature_bitmap &=
~L2INPUT_FEAT_INPUT_CLASSIFY;
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
l2_input_classify_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
t->table_index = table_index0;
t->next_index = next0;
t->session_offset = e0 ? vnet_classify_get_offset (t0, e0) : 0;
}
/* 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_INPUT_CLASSIFY_ERROR_MISS, misses);
vlib_node_increment_counter (vm, node->node_index,
L2_INPUT_CLASSIFY_ERROR_HIT, hits);
vlib_node_increment_counter (vm, node->node_index,
L2_INPUT_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2_input_classify_node) = {
.name = "l2-input-classify",
.vector_size = sizeof (u32),
.format_trace = format_l2_input_classify_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(l2_input_classify_error_strings),
.error_strings = l2_input_classify_error_strings,
.runtime_data_bytes = sizeof (l2_input_classify_runtime_t),
.n_next_nodes = L2_INPUT_CLASSIFY_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[L2_INPUT_CLASSIFY_NEXT_DROP] = "error-drop",
[L2_INPUT_CLASSIFY_NEXT_ETHERNET_INPUT] = "ethernet-input-not-l2",
[L2_INPUT_CLASSIFY_NEXT_IP4_INPUT] = "ip4-input",
[L2_INPUT_CLASSIFY_NEXT_IP6_INPUT] = "ip6-input",
[L2_INPUT_CLASSIFY_NEXT_LI] = "li-hit",
},
};
/* *INDENT-ON* */
#ifndef CLIB_MARCH_VARIANT
/** l2 input classsifier feature initialization. */
clib_error_t *
l2_input_classify_init (vlib_main_t * vm)
{
l2_input_classify_main_t *cm = &l2_input_classify_main;
l2_input_classify_runtime_t *rt;
rt = vlib_node_get_runtime_data (vm, l2_input_classify_node.index);
cm->vlib_main = vm;
cm->vnet_main = vnet_get_main ();
cm->vnet_classify_main = &vnet_classify_main;
/* Initialize the feature next-node indexes */
feat_bitmap_init_next_nodes (vm,
l2_input_classify_node.index,
L2INPUT_N_FEAT,
l2input_get_feat_names (),
cm->l2_inp_feat_next);
rt->l2cm = cm;
rt->vcm = cm->vnet_classify_main;
return 0;
}
VLIB_INIT_FUNCTION (l2_input_classify_init);
clib_error_t *
l2_input_classify_worker_init (vlib_main_t * vm)
{
l2_input_classify_main_t *cm = &l2_input_classify_main;
l2_input_classify_runtime_t *rt;
rt = vlib_node_get_runtime_data (vm, l2_input_classify_node.index);
rt->l2cm = cm;
rt->vcm = cm->vnet_classify_main;
return 0;
}
VLIB_WORKER_INIT_FUNCTION (l2_input_classify_worker_init);
/** Enable/disable l2 input classification on a specific interface. */
void
vnet_l2_input_classify_enable_disable (u32 sw_if_index, int enable_disable)
{
l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_INPUT_CLASSIFY,
(u32) enable_disable);
}
/** @brief Set l2 per-protocol, per-interface input classification tables.
*
* @param sw_if_index interface handle
* @param ip4_table_index ip4 classification table index, or ~0
* @param ip6_table_index ip6 classification table index, or ~0
* @param other_table_index non-ip4, non-ip6 classification table index,
* or ~0
* @returns 0 on success, VNET_API_ERROR_NO_SUCH_TABLE, TABLE2, TABLE3
* if the indicated (non-~0) table does not exist.
*/
int
vnet_l2_input_classify_set_tables (u32 sw_if_index,
u32 ip4_table_index,
u32 ip6_table_index, u32 other_table_index)
{
l2_input_classify_main_t *cm = &l2_input_classify_main;
vnet_classify_main_t *vcm = cm->vnet_classify_main;
/* Assume that we've validated sw_if_index in the API layer */
if (ip4_table_index != ~0 &&
pool_is_free_index (vcm->tables, ip4_table_index))
return VNET_API_ERROR_NO_SUCH_TABLE;
if (ip6_table_index != ~0 &&
pool_is_free_index (vcm->tables, ip6_table_index))
return VNET_API_ERROR_NO_SUCH_TABLE2;
if (other_table_index != ~0 &&
pool_is_free_index (vcm->tables, other_table_index))
return VNET_API_ERROR_NO_SUCH_TABLE3;
vec_validate
(cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_IP4],
sw_if_index);
vec_validate
(cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_IP6],
sw_if_index);
vec_validate
(cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_OTHER],
sw_if_index);
cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_IP4]
[sw_if_index] = ip4_table_index;
cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_IP6]
[sw_if_index] = ip6_table_index;
cm->classify_table_index_by_sw_if_index[L2_INPUT_CLASSIFY_TABLE_OTHER]
[sw_if_index] = other_table_index;
return 0;
}
#endif /* CLIB_MARCH_VARIANT */
static clib_error_t *
int_l2_input_classify_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
vnet_main_t *vnm = vnet_get_main ();
u32 sw_if_index = ~0;
u32 ip4_table_index = ~0;
u32 ip6_table_index = ~0;
u32 other_table_index = ~0;
int rv;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "intfc %U", unformat_vnet_sw_interface,
vnm, &sw_if_index))
;
else if (unformat (input, "ip4-table %d", &ip4_table_index))
;
else if (unformat (input, "ip6-table %d", &ip6_table_index))
;
else if (unformat (input, "other-table %d", &other_table_index))
;
else
break;
}
if (sw_if_index == ~0)
return clib_error_return (0, "interface must be specified");
if (ip4_table_index == ~0 && ip6_table_index == ~0
&& other_table_index == ~0)
{
vlib_cli_output (vm, "L2 classification disabled");
vnet_l2_input_classify_enable_disable (sw_if_index, 0 /* enable */ );
return 0;
}
rv = vnet_l2_input_classify_set_tables (sw_if_index, ip4_table_index,
ip6_table_index, other_table_index);
switch (rv)
{
case 0:
vnet_l2_input_classify_enable_disable (sw_if_index, 1 /* enable */ );
break;
default:
return clib_error_return (0, "vnet_l2_input_classify_set_tables: %d",
rv);
break;
}
return 0;
}
/*?
* Configure l2 input classification.
*
* @cliexpar
* @cliexstart{set interface l2 input classify intfc <interface-name> [ip4-table <index>] [ip6-table <index>] [other-table <index>]}
* @cliexend
* @todo This is incomplete. This needs a detailed description and a
* practical example.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (int_l2_input_classify_cli, static) = {
.path = "set interface l2 input classify",
.short_help =
"set interface l2 input classify intfc <interface-name> [ip4-table <n>]\n"
" [ip6-table <n>] [other-table <n>]",
.function = int_l2_input_classify_command_fn,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
