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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 <plugins/gbp/gbp.h>
/**
* Grouping of global data for the GBP source EPG classification feature
*/
typedef struct gbp_policy_main_t_
{
/**
* Next nodes for L2 output features
*/
u32 l2_output_feat_next[32];
} gbp_policy_main_t;
static gbp_policy_main_t gbp_policy_main;
#define foreach_gbp_policy \
_(DENY, "deny")
typedef enum
{
#define _(sym,str) GBP_ERROR_##sym,
foreach_gbp_policy
#undef _
GBP_POLICY_N_ERROR,
} gbp_policy_error_t;
static char *gbp_policy_error_strings[] = {
#define _(sym,string) string,
foreach_gbp_policy
#undef _
};
typedef enum
{
#define _(sym,str) GBP_POLICY_NEXT_##sym,
foreach_gbp_policy
#undef _
GBP_POLICY_N_NEXT,
} gbp_policy_next_t;
/**
* per-packet trace data
*/
typedef struct gbp_policy_trace_t_
{
/* per-pkt trace data */
epg_id_t src_epg;
epg_id_t dst_epg;
u32 acl_index;
} gbp_policy_trace_t;
static uword
gbp_policy (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
gbp_policy_main_t *gpm = &gbp_policy_main;
u32 n_left_from, *from, *to_next;
u32 next_index;
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 > 0 && n_left_to_next > 0)
{
gbp_policy_next_t next0;
gbp_contract_key_t key0;
u32 bi0, sw_if_index0;
vlib_buffer_t *b0;
u32 acl_index0;
next0 = GBP_POLICY_NEXT_DENY;
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);
/*
* determine the src and dst EPG
*/
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
key0.gck_dst = gbp_port_to_epg (sw_if_index0);
key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
acl_index0 = ~0;
if (~0 != key0.gck_src)
{
if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
{
/*
* intra-epg allowed
*/
next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
L2OUTPUT_FEAT_GBP_POLICY);
}
else
{
acl_index0 = gbp_acl_lookup (&key0);
if (~0 != acl_index0)
{
/*
* TODO tests against the ACL
*/
/*
* ACL tables are not available outside of ACL plugin
* until then bypass the ACL to next node
*/
next0 =
vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
L2OUTPUT_FEAT_GBP_POLICY);
}
}
}
else
{
/*
* the src EPG is not set when the packet arrives on an EPG
* uplink interface and we do not need to apply policy
*/
next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next,
L2OUTPUT_FEAT_GBP_POLICY);
}
if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
{
gbp_policy_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->src_epg = key0.gck_src;
t->dst_epg = key0.gck_dst;
t->acl_index = acl_index0;
}
/* 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;
}
/* packet trace format function */
static u8 *
format_gbp_policy_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 *);
gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
s =
format (s, "src:%d, dst:%d, acl:%d", t->src_epg, t->dst_epg,
t->acl_index);
return s;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (gbp_policy_node) = {
.function = gbp_policy,
.name = "gbp-policy",
.vector_size = sizeof (u32),
.format_trace = format_gbp_policy_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(gbp_policy_error_strings),
.error_strings = gbp_policy_error_strings,
.n_next_nodes = GBP_POLICY_N_NEXT,
.next_nodes = {
[GBP_POLICY_NEXT_DENY] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (gbp_policy_node, gbp_policy);
/* *INDENT-ON* */
static clib_error_t *
gbp_policy_init (vlib_main_t * vm)
{
gbp_policy_main_t *gpm = &gbp_policy_main;
/* Initialize the feature next-node indexes */
feat_bitmap_init_next_nodes (vm,
gbp_policy_node.index,
L2OUTPUT_N_FEAT,
l2output_get_feat_names (),
gpm->l2_output_feat_next);
return 0;
}
VLIB_INIT_FUNCTION (gbp_policy_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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