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/*
* Copyright (c) 2020 Doc.ai 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vnet/fib/ip6_fib.h>
#include <vnet/fib/ip4_fib.h>
#include <vnet/fib/fib_entry.h>
#include <vppinfra/error.h>
#include <wireguard/wireguard.h>
#include <wireguard/wireguard_send.h>
#define foreach_wg_output_error \
_(NONE, "No error") \
_(PEER, "Peer error") \
_(KEYPAIR, "Keypair error") \
_(HANDSHAKE_SEND, "Handshake sending failed") \
_(TOO_BIG, "packet too big") \
#define WG_OUTPUT_SCRATCH_SIZE 2048
typedef struct wg_output_scratch_t_
{
u8 scratch[WG_OUTPUT_SCRATCH_SIZE];
} wg_output_scratch_t;
/* Cache line aligned per-thread scratch space */
static wg_output_scratch_t *wg_output_scratchs;
typedef enum
{
#define _(sym,str) WG_OUTPUT_ERROR_##sym,
foreach_wg_output_error
#undef _
WG_OUTPUT_N_ERROR,
} wg_output_error_t;
static char *wg_output_error_strings[] = {
#define _(sym,string) string,
foreach_wg_output_error
#undef _
};
typedef enum
{
WG_OUTPUT_NEXT_ERROR,
WG_OUTPUT_NEXT_INTERFACE_OUTPUT,
WG_OUTPUT_N_NEXT,
} wg_output_next_t;
typedef struct
{
ip4_udp_header_t hdr;
} wg_output_tun_trace_t;
u8 *
format_ip4_udp_header (u8 * s, va_list * args)
{
ip4_udp_header_t *hdr = va_arg (*args, ip4_udp_header_t *);
s = format (s, "%U:$U",
format_ip4_header, &hdr->ip4, format_udp_header, &hdr->udp);
return (s);
}
/* packet trace format function */
static u8 *
format_wg_output_tun_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 *);
wg_output_tun_trace_t *t = va_arg (*args, wg_output_tun_trace_t *);
s = format (s, "Encrypted packet: %U\n", format_ip4_udp_header, &t->hdr);
return s;
}
VLIB_NODE_FN (wg_output_tun_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 n_left_from;
u32 *from;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 nexts[VLIB_FRAME_SIZE], *next;
u32 thread_index = vm->thread_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
b = bufs;
next = nexts;
vlib_get_buffers (vm, from, bufs, n_left_from);
wg_main_t *wmp = &wg_main;
u32 handsh_fails = 0;
wg_peer_t *peer = NULL;
while (n_left_from > 0)
{
ip4_udp_header_t *hdr = vlib_buffer_get_current (b[0]);
u8 *plain_data = (vlib_buffer_get_current (b[0]) +
sizeof (ip4_udp_header_t));
u16 plain_data_len =
clib_net_to_host_u16 (((ip4_header_t *) plain_data)->length);
next[0] = WG_OUTPUT_NEXT_ERROR;
peer =
wg_peer_get_by_adj_index (vnet_buffer (b[0])->ip.adj_index[VLIB_TX]);
if (!peer || peer->is_dead)
{
b[0]->error = node->errors[WG_OUTPUT_ERROR_PEER];
goto out;
}
if (PREDICT_FALSE (!peer->remote.r_current))
{
if (PREDICT_FALSE (!wg_send_handshake (vm, peer, false)))
handsh_fails++;
b[0]->error = node->errors[WG_OUTPUT_ERROR_KEYPAIR];
goto out;
}
size_t encrypted_packet_len = message_data_len (plain_data_len);
/*
* Ensure there is enough space to write the encrypted data
* into the packet
*/
if (PREDICT_FALSE (encrypted_packet_len >= WG_OUTPUT_SCRATCH_SIZE) ||
PREDICT_FALSE ((b[0]->current_data + encrypted_packet_len) >=
vlib_buffer_get_default_data_size (vm)))
{
b[0]->error = node->errors[WG_OUTPUT_ERROR_TOO_BIG];
goto out;
}
message_data_t *encrypted_packet =
(message_data_t *) wg_output_scratchs[thread_index].scratch;
enum noise_state_crypt state;
state =
noise_remote_encrypt (wmp->vlib_main,
&peer->remote,
&encrypted_packet->receiver_index,
&encrypted_packet->counter, plain_data,
plain_data_len,
encrypted_packet->encrypted_data);
switch (state)
{
case SC_OK:
break;
case SC_KEEP_KEY_FRESH:
if (PREDICT_FALSE (!wg_send_handshake (vm, peer, false)))
handsh_fails++;
break;
case SC_FAILED:
//TODO: Maybe wrong
if (PREDICT_FALSE (!wg_send_handshake (vm, peer, false)))
handsh_fails++;
clib_mem_free (encrypted_packet);
goto out;
default:
break;
}
// Here we are sure that can send packet to next node.
next[0] = WG_OUTPUT_NEXT_INTERFACE_OUTPUT;
encrypted_packet->header.type = MESSAGE_DATA;
clib_memcpy (plain_data, (u8 *) encrypted_packet, encrypted_packet_len);
hdr->udp.length = clib_host_to_net_u16 (encrypted_packet_len +
sizeof (udp_header_t));
b[0]->current_length = (encrypted_packet_len +
sizeof (ip4_header_t) + sizeof (udp_header_t));
ip4_header_set_len_w_chksum
(&hdr->ip4, clib_host_to_net_u16 (b[0]->current_length));
wg_timers_any_authenticated_packet_traversal (peer);
wg_timers_any_authenticated_packet_sent (peer);
wg_timers_data_sent (peer);
out:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
wg_output_tun_trace_t *t =
vlib_add_trace (vm, node, b[0], sizeof (*t));
t->hdr = *hdr;
}
n_left_from -= 1;
next += 1;
b += 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
vlib_node_increment_counter (vm, node->node_index,
WG_OUTPUT_ERROR_HANDSHAKE_SEND, handsh_fails);
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (wg_output_tun_node) =
{
.name = "wg-output-tun",
.vector_size = sizeof (u32),
.format_trace = format_wg_output_tun_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (wg_output_error_strings),
.error_strings = wg_output_error_strings,
.n_next_nodes = WG_OUTPUT_N_NEXT,
.next_nodes = {
[WG_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
[WG_OUTPUT_NEXT_ERROR] = "error-drop",
},
};
/* *INDENT-ON* */
static clib_error_t *
wireguard_output_module_init (vlib_main_t * vm)
{
vlib_thread_main_t *tm = vlib_get_thread_main ();
vec_validate_aligned (wg_output_scratchs, tm->n_vlib_mains,
CLIB_CACHE_LINE_BYTES);
return (NULL);
}
VLIB_INIT_FUNCTION (wireguard_output_module_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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