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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/adj/adj_nbr.h>
#include <vnet/adj/adj_internal.h>
#include <vnet/ethernet/arp_packet.h>
#include <vnet/dpo/drop_dpo.h>
#include <vnet/fib/fib_walk.h>
static inline u32
adj_get_midchain_node (fib_link_t link)
{
switch (link) {
case FIB_LINK_IP4:
return (ip4_midchain_node.index);
case FIB_LINK_IP6:
return (ip6_midchain_node.index);
case FIB_LINK_MPLS:
return (mpls_midchain_node.index);
}
ASSERT(0);
return (0);
}
/**
* adj_nbr_midchain_update_rewrite
*
* Update the adjacency's rewrite string. A NULL string implies the
* rewrite is reset (i.e. when ARP/ND etnry is gone).
* NB: the adj being updated may be handling traffic in the DP.
*/
void
adj_nbr_midchain_update_rewrite (adj_index_t adj_index,
u32 post_rewrite_node,
u8 *rewrite)
{
ip_adjacency_t *adj;
ASSERT(ADJ_INDEX_INVALID != adj_index);
adj = adj_get(adj_index);
adj->lookup_next_index = IP_LOOKUP_NEXT_MIDCHAIN;
adj->sub_type.midchain.tx_function_node = post_rewrite_node;
if (NULL != rewrite)
{
/*
* new rewrite provided.
* use a dummy rewrite header to get the interface to print into.
*/
ip_adjacency_t dummy;
dpo_id_t tmp = DPO_NULL;
vnet_rewrite_for_tunnel(vnet_get_main(),
adj->rewrite_header.sw_if_index,
adj_get_midchain_node(adj->ia_link),
adj->sub_type.midchain.tx_function_node,
&dummy.rewrite_header,
rewrite,
vec_len(rewrite));
/*
* this is an update of an existing rewrite.
* packets are in flight. we'll need to briefly stack on the drop DPO
* whilst the rewrite is written, so any packets that see the partial update
* are binned.
*/
if (!dpo_id_is_valid(&adj->sub_type.midchain.next_dpo))
{
/*
* not stacked yet. stack on the drop
*/
dpo_stack(DPO_ADJACENCY_MIDCHAIN,
fib_proto_to_dpo(adj->ia_nh_proto),
&adj->sub_type.midchain.next_dpo,
drop_dpo_get(fib_proto_to_dpo(adj->ia_nh_proto)));
}
dpo_copy(&tmp, &adj->sub_type.midchain.next_dpo);
dpo_stack(DPO_ADJACENCY_MIDCHAIN,
fib_proto_to_dpo(adj->ia_nh_proto),
&adj->sub_type.midchain.next_dpo,
drop_dpo_get(fib_proto_to_dpo(adj->ia_nh_proto)));
CLIB_MEMORY_BARRIER();
clib_memcpy(&adj->rewrite_header,
&dummy.rewrite_header,
VLIB_BUFFER_PRE_DATA_SIZE);
CLIB_MEMORY_BARRIER();
/*
* The graph arc used/created here is from the post-rewirte node to the
* child's registered node. This is because post adj processing the next
* node is the interface's specific node, then the post-write-node (aka
* the interface's tx-function) - from there we need to get to the stacked
* child's node.
*/
dpo_stack_from_node(adj->sub_type.midchain.tx_function_node,
&adj->sub_type.midchain.next_dpo,
&tmp);
dpo_reset(&tmp);
}
else
{
ASSERT(0);
}
/*
* time for walkies fido.
*/
fib_node_back_walk_ctx_t bw_ctx = {
.fnbw_reason = FIB_NODE_BW_REASON_ADJ_UPDATE,
};
fib_walk_sync(FIB_NODE_TYPE_ADJ, adj->heap_handle, &bw_ctx);
}
/**
* adj_nbr_midchain_stack
*/
void
adj_nbr_midchain_stack (adj_index_t adj_index,
const dpo_id_t *next)
{
ip_adjacency_t *adj;
ASSERT(ADJ_INDEX_INVALID != adj_index);
adj = adj_get(adj_index);
ASSERT(IP_LOOKUP_NEXT_MIDCHAIN == adj->lookup_next_index);
dpo_stack_from_node(adj->sub_type.midchain.tx_function_node,
&adj->sub_type.midchain.next_dpo,
next);
}
u8*
format_adj_midchain (u8* s, va_list *ap)
{
index_t index = va_arg(ap, index_t);
u32 indent = va_arg(ap, u32);
vnet_main_t * vnm = vnet_get_main();
ip_adjacency_t * adj = adj_get(index);
s = format (s, "%U", format_fib_link, adj->ia_link);
s = format (s, " via %U ",
format_ip46_address, &adj->sub_type.nbr.next_hop);
s = format (s, " %U",
format_vnet_rewrite,
vnm->vlib_main, &adj->rewrite_header,
sizeof (adj->rewrite_data), indent);
s = format (s, "\n%Ustacked-on:\n%U%U",
format_white_space, indent,
format_white_space, indent+2,
format_dpo_id, &adj->sub_type.midchain.next_dpo, indent+2);
return (s);
}
static void
adj_dpo_lock (dpo_id_t *dpo)
{
adj_lock(dpo->dpoi_index);
}
static void
adj_dpo_unlock (dpo_id_t *dpo)
{
adj_unlock(dpo->dpoi_index);
}
const static dpo_vft_t adj_midchain_dpo_vft = {
.dv_lock = adj_dpo_lock,
.dv_unlock = adj_dpo_unlock,
.dv_format = format_adj_midchain,
};
/**
* @brief The per-protocol VLIB graph nodes that are assigned to a midchain
* object.
*
* this means that these graph nodes are ones from which a midchain is the
* parent object in the DPO-graph.
*/
const static char* const midchain_ip4_nodes[] =
{
"ip4-midchain",
NULL,
};
const static char* const midchain_ip6_nodes[] =
{
"ip6-midchain",
NULL,
};
const static char* const midchain_mpls_nodes[] =
{
"mpls-midchain",
NULL,
};
const static char* const * const midchain_nodes[DPO_PROTO_NUM] =
{
[DPO_PROTO_IP4] = midchain_ip4_nodes,
[DPO_PROTO_IP6] = midchain_ip6_nodes,
[DPO_PROTO_MPLS] = midchain_mpls_nodes,
};
void
adj_midchain_module_init (void)
{
dpo_register(DPO_ADJACENCY_MIDCHAIN, &adj_midchain_dpo_vft, midchain_nodes);
}
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