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/*
* ipsec_if_in.c : IPSec interface input node
*
* 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 <vnet/vnet.h>
#include <vnet/api_errno.h>
#include <vnet/ip/ip.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/esp.h>
/* Statistics (not really errors) */
#define foreach_ipsec_if_input_error \
_(RX, "good packets received")
static char * ipsec_if_input_error_strings[] = {
#define _(sym,string) string,
foreach_ipsec_if_input_error
#undef _
};
typedef enum {
#define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
foreach_ipsec_if_input_error
#undef _
IPSEC_IF_INPUT_N_ERROR,
} ipsec_if_input_error_t;
typedef enum {
IPSEC_IF_INPUT_NEXT_ESP_DECRYPT,
IPSEC_IF_INPUT_NEXT_DROP,
IPSEC_IF_INPUT_N_NEXT,
} ipsec_if_input_next_t;
typedef struct {
u32 spi;
u32 seq;
} ipsec_if_input_trace_t;
u8 * format_ipsec_if_input_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 *);
ipsec_if_input_trace_t * t
= va_arg (*args, ipsec_if_input_trace_t *);
s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
return s;
}
static uword
ipsec_if_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
ipsec_main_t *im = &ipsec_main;
u32 * from, * to_next = 0, next_index;
u32 n_left_from;
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, next0;
vlib_buffer_t * b0;
ip4_header_t *ip0;
esp_header_t *esp0;
uword * p;
bi0 = to_next[0] = from[0];
from += 1;
n_left_from -= 1;
to_next +=1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
ip0 = vlib_buffer_get_current (b0);
esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
next0 = IPSEC_IF_INPUT_NEXT_DROP;
u64 key = (u64) ip0->src_address.as_u32 << 32 |
(u64) clib_net_to_host_u32(esp0->spi);
p = hash_get (im->ipsec_if_pool_index_by_key, key);
if (p)
{
ipsec_tunnel_if_t * t;
t = pool_elt_at_index(im->tunnel_interfaces, p[0]);
vnet_buffer(b0)->output_features.ipsec_sad_index = t->input_sa_index;
vlib_buffer_advance(b0, ip4_header_bytes (ip0));
next0 = IPSEC_IF_INPUT_NEXT_ESP_DECRYPT;
}
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
ipsec_if_input_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->spi = clib_host_to_net_u32(esp0->spi);
tr->seq = clib_host_to_net_u32(esp0->seq);
}
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, ipsec_if_input_node.index,
IPSEC_IF_INPUT_ERROR_RX,
from_frame->n_vectors);
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (ipsec_if_input_node) = {
.function = ipsec_if_input_node_fn,
.name = "ipsec-if-input",
.vector_size = sizeof (u32),
.format_trace = format_ipsec_if_input_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
.error_strings = ipsec_if_input_error_strings,
.n_next_nodes = IPSEC_IF_INPUT_N_NEXT,
.next_nodes = {
[IPSEC_IF_INPUT_NEXT_ESP_DECRYPT] = "esp-decrypt",
[IPSEC_IF_INPUT_NEXT_DROP] = "error-drop",
},
};
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