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/*
* Copyright (c) 2017 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 <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/udp/udp_local.h>
#include <vnet/ethernet/ethernet.h>
#include <lisp/lisp-gpe/lisp_gpe_packet.h>
#include <nsh/nsh.h>
#include <nsh/nsh_packet.h>
#include <nsh/nsh-md2-ioam/nsh_md2_ioam.h>
#include <nsh/nsh-md2-ioam/nsh_md2_ioam_util.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/fib_entry.h>
/* Statistics (not really errors) */
#define foreach_nsh_md2_ioam_encap_transit_error \
_(ENCAPSULATED, "good packets encapsulated")
static char *nsh_md2_ioam_encap_transit_error_strings[] = {
#define _(sym,string) string,
foreach_nsh_md2_ioam_encap_transit_error
#undef _
};
typedef enum
{
#define _(sym,str) NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_ERROR_##sym,
foreach_nsh_md2_ioam_encap_transit_error
#undef _
NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_ERROR,
} nsh_md2_ioam_encap_transit_error_t;
typedef enum
{
NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT,
NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT
} nsh_md2_ioam_encap_transit_next_t;
VNET_FEATURE_INIT (nsh_md2_ioam_encap_transit, static) =
{
.arc_name = "ip4-output",
.node_name = "nsh-md2-ioam-encap-transit",
};
static uword
nsh_md2_ioam_encap_transit (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
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)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0 = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
ip4_header_t *ip0;
u32 iph_offset = 0;
b0 = vlib_get_buffer (vm, bi0);
iph_offset = vnet_buffer (b0)->ip.save_rewrite_length;
ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0)
+ iph_offset);
/* just forward non ipv4 packets */
if (PREDICT_FALSE
((ip0->ip_version_and_header_length & 0xF0) == 0x40))
{
/* ipv4 packets */
udp_header_t *udp_hdr0 = (udp_header_t *) (ip0 + 1);
if (PREDICT_FALSE
((ip0->protocol == IP_PROTOCOL_UDP) &&
(clib_net_to_host_u16 (udp_hdr0->dst_port) ==
UDP_DST_PORT_lisp_gpe)))
{
/* Check the iOAM header */
lisp_gpe_header_t *lisp_gpe_hdr0 =
(lisp_gpe_header_t *) (udp_hdr0 + 1);
nsh_base_header_t *nsh_hdr =
(nsh_base_header_t *) (lisp_gpe_hdr0 + 1);
if (PREDICT_FALSE
(lisp_gpe_hdr0->next_protocol ==
LISP_GPE_NEXT_PROTO_NSH) && (nsh_hdr->md_type == 2))
{
uword *t = NULL;
nsh_md2_ioam_main_t *hm = &nsh_md2_ioam_main;
fib_prefix_t key4;
clib_memset (&key4, 0, sizeof (key4));
key4.fp_proto = FIB_PROTOCOL_IP4;
key4.fp_addr.ip4.as_u32 = ip0->dst_address.as_u32;
t = hash_get_mem (hm->dst_by_ip4, &key4);
if (t)
{
vlib_buffer_advance (b0,
(word) (sizeof
(ethernet_header_t)));
nsh_md2_ioam_encap_decap_ioam_v4_one_inline (vm,
node,
b0,
&next0,
NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP,
1
/* use_adj */
);
vlib_buffer_advance (b0,
-(word) (sizeof
(ethernet_header_t)));
}
}
}
}
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 from_frame->n_vectors;
}
extern u8 *format_nsh_node_map_trace (u8 * s, va_list * args);
VLIB_REGISTER_NODE (nsh_md2_ioam_encap_transit_node) = {
.function = nsh_md2_ioam_encap_transit,
.name = "nsh-md2-ioam-encap-transit",
.vector_size = sizeof (u32),
.format_trace = format_nsh_node_map_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nsh_md2_ioam_encap_transit_error_strings),
.error_strings = nsh_md2_ioam_encap_transit_error_strings,
.n_next_nodes = NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_N_NEXT,
.next_nodes = {
[NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_OUTPUT] = "interface-output",
[NSH_MD2_IOAM_ENCAP_TRANSIT_IOAM_NEXT_DROP] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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