/*
* 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") \
_(DISABLED, "ipsec packets received on disabled interface") \
_(NO_TUNNEL, "no matching tunnel")
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 struct
{
u32 spi;
u32 seq;
} ipsec_if_input_trace_t;
static 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;
}
VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
ipsec_main_t *im = &ipsec_main;
vnet_main_t *vnm = im->vnet_main;
vnet_interface_main_t *vim = &vnm->interface_main;
ipsec_proto_main_t *em = &ipsec_proto_main;
u32 *from, *to_next = 0, next_index;
u32 n_left_from, last_sw_if_index = ~0;
u32 thread_index = vm->thread_index;
u64 n_bytes = 0, n_packets = 0;
u8 icv_len;
ipsec_tunnel_if_t *last_t = NULL;
ipsec_sa_t *sa0;
vlib_combined_counter_main_t *rx_counter;
vlib_combined_counter_main_t *drop_counter;
u32 n_disabled = 0, n_no_tunnel = 0;
rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
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, sw_if_index0;
vlib_buffer_t *b0;
ip4_header_t *ip0;
esp_header_t *esp0;
uword *p;
u32 len0;
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_INPUT_NEXT_DROP;
u64 key = (u64) ip0->src_address.as_u32 << 32 | (u64) esp0->spi;
p = hash_get (im->ipsec_if_pool_index_by_key, key);
len0 = vlib_buffer_length_in_chain (vm, b0);
if (p)
{
ipsec_tunnel_if_t *t;
t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
if (t->hw_if_index != ~0)
{
vnet_hw_interface_t *hi;
vnet_buffer (b0)->ipsec.flags = 0;
hi = vnet_get_hw_interface (vnm, t->hw_if_index);
sw_if_index0 = hi->sw_if_index;
vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
if (PREDICT_FALSE
(!(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
{
vlib_increment_combined_counter
(drop_counter, thread_index, sw_if_index0, 1, len0);
b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
n_disabled++;
goto trace;
}
if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
{
n_packets++;
n_bytes += len0;
}
else
{
sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
icv_len =
em->ipsec_proto_main_integ_algs[sa0->
integ_alg].trunc_size;
/* length = packet length - ESP/tunnel overhead */
n_bytes -= n_packets * (sizeof (ip4_header_t) +
sizeof (esp_header_t) +
sizeof (esp_footer_t) +
16 /* aes-cbc IV */ + icv_len);
if (last_t)
{
vlib_increment_combined_counter
(rx_counter, thread_index, sw_if_index0,
n_packets, n_bytes);
}
last_sw_if_index = sw_if_index0;
last_t = t;
n_packets = 1;
n_bytes = len0;
}
}
else
{
vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
}
vlib_buffer_advance (b0, ip4_header_bytes (ip0));
next0 = im->esp4_decrypt_next_index;
}
else
{
b0->error = node->errors[IPSEC_IF_INPUT_ERROR_NO_TUNNEL];
n_no_tunnel++;
}
trace:
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);
}
if (last_t)
{
sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
icv_len = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
sizeof (esp_footer_t) + 16 /* aes-cbc IV */ +
icv_len);
vlib_increment_combined_counter (rx_counter,
thread_index,
last_sw_if_index, n_packets, n_bytes);
}
vlib_node_increment_counter (vm, ipsec_if_input_node.index,
IPSEC_IF_INPUT_ERROR_RX,
from_frame->n_vectors - n_disabled);
vlib_node_increment_counter (vm, ipsec_if_input_node.index,
IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
vlib_node_increment_counter (vm, ipsec_if_input_node.index,
IPSEC_IF_INPUT_ERROR_DISABLED, n_no_tunnel);
return from_frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (ipsec_if_input_node) = {
.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,
.sibling_of = "ipsec4-input-feature",
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
