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583d4c94dc69f624a44a8dfa5c82165f3ca27271
vpp/src/plugins/wireguard/wireguard_input.c
T
Matthew Smith 6a3f0ab2fd wireguard: eliminate some calls to main thread 
Type: improvement

Roaming functionality allows the peer address to change. The main thread
was being called to update a peer's address if necessary after
processing a received packet. Check in the worker whether this is
necessary before incurring the overhead of the RPC to the main thread.

Signed-off-by: Matthew Smith <mgsmith@netgate.com>
Change-Id: I02184b92dc658e0f57dd39993a3b2f9944187b45
2022-09-08 13:41:54 +00:00

1108 lines
31 KiB
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/*
* Copyright (c) 2020 Doc.ai and/or its affiliates.
* Copyright (c) 2020 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <wireguard/wireguard.h>
#include <wireguard/wireguard_send.h>
#include <wireguard/wireguard_if.h>
#define foreach_wg_input_error \
_ (NONE, "No error") \
_ (HANDSHAKE_MAC, "Invalid MAC handshake") \
_ (HANDSHAKE_RATELIMITED, "Handshake ratelimited") \
_ (PEER, "Peer error") \
_ (INTERFACE, "Interface error") \
_ (DECRYPTION, "Failed during decryption") \
_ (KEEPALIVE_SEND, "Failed while sending Keepalive") \
_ (HANDSHAKE_SEND, "Failed while sending Handshake") \
_ (HANDSHAKE_RECEIVE, "Failed while receiving Handshake") \
_ (COOKIE_DECRYPTION, "Failed during Cookie decryption") \
_ (COOKIE_SEND, "Failed during sending Cookie") \
_ (TOO_BIG, "Packet too big") \
_ (UNDEFINED, "Undefined error") \
_ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)")
typedef enum
{
#define _(sym,str) WG_INPUT_ERROR_##sym,
foreach_wg_input_error
#undef _
WG_INPUT_N_ERROR,
} wg_input_error_t;
static char *wg_input_error_strings[] = {
#define _(sym,string) string,
foreach_wg_input_error
#undef _
};
typedef struct
{
message_type_t type;
u16 current_length;
bool is_keepalive;
index_t peer;
} wg_input_trace_t;
typedef struct
{
index_t peer;
u16 next;
} wg_input_post_trace_t;
u8 *
format_wg_message_type (u8 * s, va_list * args)
{
message_type_t type = va_arg (*args, message_type_t);
switch (type)
{
#define _(v,a) case MESSAGE_##v: return (format (s, "%s", a));
foreach_wg_message_type
#undef _
}
return (format (s, "unknown"));
}
/* packet trace format function */
static u8 *
format_wg_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 *);
wg_input_trace_t *t = va_arg (*args, wg_input_trace_t *);
s = format (s, "Wireguard input: \n");
s = format (s, " Type: %U\n", format_wg_message_type, t->type);
s = format (s, " Peer: %d\n", t->peer);
s = format (s, " Length: %d\n", t->current_length);
s = format (s, " Keepalive: %s", t->is_keepalive ? "true" : "false");
return s;
}
/* post-node packet trace format function */
static u8 *
format_wg_input_post_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_input_post_trace_t *t = va_arg (*args, wg_input_post_trace_t *);
s = format (s, "WG input post: \n");
s = format (s, " peer: %u\n", t->peer);
s = format (s, " next: %u\n", t->next);
return s;
}
typedef enum
{
WG_INPUT_NEXT_HANDOFF_HANDSHAKE,
WG_INPUT_NEXT_HANDOFF_DATA,
WG_INPUT_NEXT_IP4_INPUT,
WG_INPUT_NEXT_IP6_INPUT,
WG_INPUT_NEXT_PUNT,
WG_INPUT_NEXT_ERROR,
WG_INPUT_N_NEXT,
} wg_input_next_t;
static u8
is_ip4_header (u8 *data)
{
return (data[0] >> 4) == 0x4;
}
static wg_input_error_t
wg_handshake_process (vlib_main_t *vm, wg_main_t *wmp, vlib_buffer_t *b,
u32 node_idx, u8 is_ip4)
{
ASSERT (vm->thread_index == 0);
enum cookie_mac_state mac_state;
bool packet_needs_cookie;
bool under_load;
index_t *wg_ifs;
wg_if_t *wg_if;
wg_peer_t *peer = NULL;
void *current_b_data = vlib_buffer_get_current (b);
ip46_address_t src_ip;
if (is_ip4)
{
ip4_header_t *iph4 =
current_b_data - sizeof (udp_header_t) - sizeof (ip4_header_t);
ip46_address_set_ip4 (&src_ip, &iph4->src_address);
}
else
{
ip6_header_t *iph6 =
current_b_data - sizeof (udp_header_t) - sizeof (ip6_header_t);
ip46_address_set_ip6 (&src_ip, &iph6->src_address);
}
udp_header_t *uhd = current_b_data - sizeof (udp_header_t);
u16 udp_src_port = clib_host_to_net_u16 (uhd->src_port);
u16 udp_dst_port = clib_host_to_net_u16 (uhd->dst_port);
message_header_t *header = current_b_data;
if (PREDICT_FALSE (header->type == MESSAGE_HANDSHAKE_COOKIE))
{
message_handshake_cookie_t *packet =
(message_handshake_cookie_t *) current_b_data;
u32 *entry =
wg_index_table_lookup (&wmp->index_table, packet->receiver_index);
if (entry)
peer = wg_peer_get (*entry);
else
return WG_INPUT_ERROR_PEER;
if (!cookie_maker_consume_payload (
vm, &peer->cookie_maker, packet->nonce, packet->encrypted_cookie))
return WG_INPUT_ERROR_COOKIE_DECRYPTION;
return WG_INPUT_ERROR_NONE;
}
u32 len = (header->type == MESSAGE_HANDSHAKE_INITIATION ?
sizeof (message_handshake_initiation_t) :
sizeof (message_handshake_response_t));
message_macs_t *macs = (message_macs_t *)
((u8 *) current_b_data + len - sizeof (*macs));
index_t *ii;
wg_ifs = wg_if_indexes_get_by_port (udp_dst_port);
if (NULL == wg_ifs)
return WG_INPUT_ERROR_INTERFACE;
vec_foreach (ii, wg_ifs)
{
wg_if = wg_if_get (*ii);
if (NULL == wg_if)
continue;
under_load = wg_if_is_under_load (vm, wg_if);
mac_state = cookie_checker_validate_macs (
vm, &wg_if->cookie_checker, macs, current_b_data, len, under_load,
&src_ip, udp_src_port);
if (mac_state == INVALID_MAC)
{
wg_if_dec_handshake_num (wg_if);
wg_if = NULL;
continue;
}
break;
}
if (NULL == wg_if)
return WG_INPUT_ERROR_HANDSHAKE_MAC;
if ((under_load && mac_state == VALID_MAC_WITH_COOKIE)
|| (!under_load && mac_state == VALID_MAC_BUT_NO_COOKIE))
packet_needs_cookie = false;
else if (under_load && mac_state == VALID_MAC_BUT_NO_COOKIE)
packet_needs_cookie = true;
else if (mac_state == VALID_MAC_WITH_COOKIE_BUT_RATELIMITED)
return WG_INPUT_ERROR_HANDSHAKE_RATELIMITED;
else
return WG_INPUT_ERROR_HANDSHAKE_MAC;
switch (header->type)
{
case MESSAGE_HANDSHAKE_INITIATION:
{
message_handshake_initiation_t *message = current_b_data;
if (packet_needs_cookie)
{
if (!wg_send_handshake_cookie (vm, message->sender_index,
&wg_if->cookie_checker, macs,
&ip_addr_46 (&wg_if->src_ip),
wg_if->port, &src_ip, udp_src_port))
return WG_INPUT_ERROR_COOKIE_SEND;
return WG_INPUT_ERROR_NONE;
}
noise_remote_t *rp;
if (noise_consume_initiation
(vm, noise_local_get (wg_if->local_idx), &rp,
message->sender_index, message->unencrypted_ephemeral,
message->encrypted_static, message->encrypted_timestamp))
{
peer = wg_peer_get (rp->r_peer_idx);
}
else
{
return WG_INPUT_ERROR_PEER;
}
wg_peer_update_endpoint (rp->r_peer_idx, &src_ip, udp_src_port);
if (PREDICT_FALSE (!wg_send_handshake_response (vm, peer)))
{
vlib_node_increment_counter (vm, node_idx,
WG_INPUT_ERROR_HANDSHAKE_SEND, 1);
}
else
{
wg_peer_update_flags (rp->r_peer_idx, WG_PEER_ESTABLISHED, true);
}
break;
}
case MESSAGE_HANDSHAKE_RESPONSE:
{
message_handshake_response_t *resp = current_b_data;
if (packet_needs_cookie)
{
if (!wg_send_handshake_cookie (vm, resp->sender_index,
&wg_if->cookie_checker, macs,
&ip_addr_46 (&wg_if->src_ip),
wg_if->port, &src_ip, udp_src_port))
return WG_INPUT_ERROR_COOKIE_SEND;
return WG_INPUT_ERROR_NONE;
}
index_t peeri = INDEX_INVALID;
u32 *entry =
wg_index_table_lookup (&wmp->index_table, resp->receiver_index);
if (PREDICT_TRUE (entry != NULL))
{
peeri = *entry;
peer = wg_peer_get (peeri);
if (wg_peer_is_dead (peer))
return WG_INPUT_ERROR_PEER;
}
else
return WG_INPUT_ERROR_PEER;
if (!noise_consume_response
(vm, &peer->remote, resp->sender_index,
resp->receiver_index, resp->unencrypted_ephemeral,
resp->encrypted_nothing))
{
return WG_INPUT_ERROR_PEER;
}
wg_peer_update_endpoint (peeri, &src_ip, udp_src_port);
if (noise_remote_begin_session (vm, &peer->remote))
{
wg_timers_session_derived (peer);
wg_timers_handshake_complete (peer);
if (PREDICT_FALSE (!wg_send_keepalive (vm, peer)))
{
vlib_node_increment_counter (vm, node_idx,
WG_INPUT_ERROR_KEEPALIVE_SEND, 1);
}
else
{
wg_peer_update_flags (peeri, WG_PEER_ESTABLISHED, true);
}
}
break;
}
default:
return WG_INPUT_ERROR_HANDSHAKE_RECEIVE;
}
wg_timers_any_authenticated_packet_received (peer);
wg_timers_any_authenticated_packet_traversal (peer);
return WG_INPUT_ERROR_NONE;
}
static_always_inline int
wg_input_post_process (vlib_main_t *vm, vlib_buffer_t *b, u16 *next,
wg_peer_t *peer, message_data_t *data,
bool *is_keepalive)
{
next[0] = WG_INPUT_NEXT_PUNT;
noise_keypair_t *kp =
wg_get_active_keypair (&peer->remote, data->receiver_index);
if (!noise_counter_recv (&kp->kp_ctr, data->counter))
{
return -1;
}
u16 encr_len = b->current_length - sizeof (message_data_t);
u16 decr_len = encr_len - NOISE_AUTHTAG_LEN;
vlib_buffer_advance (b, sizeof (message_data_t));
b->current_length = decr_len;
vnet_buffer_offload_flags_clear (b, VNET_BUFFER_OFFLOAD_F_UDP_CKSUM);
/* Keepalive packet has zero length */
if (decr_len == 0)
{
*is_keepalive = true;
return -1;
}
wg_timers_data_received (peer);
ip46_address_t src_ip;
u8 is_ip4_inner = is_ip4_header (vlib_buffer_get_current (b));
if (is_ip4_inner)
{
ip46_address_set_ip4 (
&src_ip, &((ip4_header_t *) vlib_buffer_get_current (b))->src_address);
}
else
{
ip46_address_set_ip6 (
&src_ip, &((ip6_header_t *) vlib_buffer_get_current (b))->src_address);
}
const fib_prefix_t *allowed_ip;
bool allowed = false;
/*
* we could make this into an ACL, but the expectation
* is that there aren't many allowed IPs and thus a linear
* walk is faster than an ACL
*/
vec_foreach (allowed_ip, peer->allowed_ips)
{
if (fib_prefix_is_cover_addr_46 (allowed_ip, &src_ip))
{
allowed = true;
break;
}
}
if (allowed)
{
vnet_buffer (b)->sw_if_index[VLIB_RX] = peer->wg_sw_if_index;
next[0] =
is_ip4_inner ? WG_INPUT_NEXT_IP4_INPUT : WG_INPUT_NEXT_IP6_INPUT;
}
return 0;
}
static_always_inline void
wg_input_process_ops (vlib_main_t *vm, vlib_node_runtime_t *node,
vnet_crypto_op_t *ops, vlib_buffer_t *b[], u16 *nexts,
u16 drop_next)
{
u32 n_fail, n_ops = vec_len (ops);
vnet_crypto_op_t *op = ops;
if (n_ops == 0)
return;
n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops);
while (n_fail)
{
ASSERT (op - ops < n_ops);
if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED)
{
u32 bi = op->user_data;
b[bi]->error = node->errors[WG_INPUT_ERROR_DECRYPTION];
nexts[bi] = drop_next;
n_fail--;
}
op++;
}
}
always_inline void
wg_prepare_sync_dec_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops,
u8 *src, u32 src_len, u8 *dst, u8 *aad, u32 aad_len,
vnet_crypto_key_index_t key_index, u32 bi, u8 *iv)
{
vnet_crypto_op_t _op, *op = &_op;
u8 src_[] = {};
vec_add2_aligned (crypto_ops[0], op, 1, CLIB_CACHE_LINE_BYTES);
vnet_crypto_op_init (op, VNET_CRYPTO_OP_CHACHA20_POLY1305_DEC);
op->tag_len = NOISE_AUTHTAG_LEN;
op->tag = src + src_len;
op->src = !src ? src_ : src;
op->len = src_len;
op->dst = dst;
op->key_index = key_index;
op->aad = aad;
op->aad_len = aad_len;
op->iv = iv;
op->user_data = bi;
op->flags |= VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
}
static_always_inline void
wg_input_add_to_frame (vlib_main_t *vm, vnet_crypto_async_frame_t *f,
u32 key_index, u32 crypto_len, i16 crypto_start_offset,
u32 buffer_index, u16 next_node, u8 *iv, u8 *tag,
u8 flags)
{
vnet_crypto_async_frame_elt_t *fe;
u16 index;
ASSERT (f->n_elts < VNET_CRYPTO_FRAME_SIZE);
index = f->n_elts;
fe = &f->elts[index];
f->n_elts++;
fe->key_index = key_index;
fe->crypto_total_length = crypto_len;
fe->crypto_start_offset = crypto_start_offset;
fe->iv = iv;
fe->tag = tag;
fe->flags = flags;
f->buffer_indices[index] = buffer_index;
f->next_node_index[index] = next_node;
}
static_always_inline enum noise_state_crypt
wg_input_process (vlib_main_t *vm, wg_per_thread_data_t *ptd,
vnet_crypto_op_t **crypto_ops,
vnet_crypto_async_frame_t **async_frame, vlib_buffer_t *b,
u32 buf_idx, noise_remote_t *r, uint32_t r_idx,
uint64_t nonce, uint8_t *src, size_t srclen, uint8_t *dst,
u32 from_idx, u8 *iv, f64 time, u8 is_async,
u16 async_next_node)
{
noise_keypair_t *kp;
enum noise_state_crypt ret = SC_FAILED;
if ((kp = wg_get_active_keypair (r, r_idx)) == NULL)
{
goto error;
}
/* We confirm that our values are within our tolerances. These values
* are the same as the encrypt routine.
*
* kp_ctr isn't locked here, we're happy to accept a racy read. */
if (wg_birthdate_has_expired_opt (kp->kp_birthdate, REJECT_AFTER_TIME,
time) ||
kp->kp_ctr.c_recv >= REJECT_AFTER_MESSAGES)
goto error;
/* Decrypt, then validate the counter. We don't want to validate the
* counter before decrypting as we do not know the message is authentic
* prior to decryption. */
clib_memset (iv, 0, 4);
clib_memcpy (iv + 4, &nonce, sizeof (nonce));
if (is_async)
{
if (NULL == *async_frame ||
vnet_crypto_async_frame_is_full (*async_frame))
{
*async_frame = vnet_crypto_async_get_frame (
vm, VNET_CRYPTO_OP_CHACHA20_POLY1305_TAG16_AAD0_DEC);
/* Save the frame to the list we'll submit at the end */
vec_add1 (ptd->async_frames, *async_frame);
}
wg_input_add_to_frame (vm, *async_frame, kp->kp_recv_index, srclen,
src - b->data, buf_idx, async_next_node, iv,
src + srclen, VNET_CRYPTO_OP_FLAG_HMAC_CHECK);
}
else
{
wg_prepare_sync_dec_op (vm, crypto_ops, src, srclen, dst, NULL, 0,
kp->kp_recv_index, from_idx, iv);
}
/* If we've received the handshake confirming data packet then move the
* next keypair into current. If we do slide the next keypair in, then
* we skip the REKEY_AFTER_TIME_RECV check. This is safe to do as a
* data packet can't confirm a session that we are an INITIATOR of. */
if (kp == r->r_next)
{
clib_rwlock_writer_lock (&r->r_keypair_lock);
if (kp == r->r_next && kp->kp_local_index == r_idx)
{
noise_remote_keypair_free (vm, r, &r->r_previous);
r->r_previous = r->r_current;
r->r_current = r->r_next;
r->r_next = NULL;
ret = SC_CONN_RESET;
clib_rwlock_writer_unlock (&r->r_keypair_lock);
goto error;
}
clib_rwlock_writer_unlock (&r->r_keypair_lock);
}
/* Similar to when we encrypt, we want to notify the caller when we
* are approaching our tolerances. We notify if:
* - we're the initiator and the current keypair is older than
* REKEY_AFTER_TIME_RECV seconds. */
ret = SC_KEEP_KEY_FRESH;
kp = r->r_current;
if (kp != NULL && kp->kp_valid && kp->kp_is_initiator &&
wg_birthdate_has_expired_opt (kp->kp_birthdate, REKEY_AFTER_TIME_RECV,
time))
goto error;
ret = SC_OK;
error:
return ret;
}
static_always_inline void
wg_find_outer_addr_port (vlib_buffer_t *b, ip46_address_t *addr, u16 *port,
u8 is_ip4)
{
if (is_ip4)
{
ip4_udp_header_t *ip4_udp_hdr =
vlib_buffer_get_current (b) - sizeof (ip4_udp_header_t);
ip46_address_set_ip4 (addr, &ip4_udp_hdr->ip4.src_address);
*port = clib_net_to_host_u16 (ip4_udp_hdr->udp.src_port);
}
else
{
ip6_udp_header_t *ip6_udp_hdr =
vlib_buffer_get_current (b) - sizeof (ip6_udp_header_t);
ip46_address_set_ip6 (addr, &ip6_udp_hdr->ip6.src_address);
*port = clib_net_to_host_u16 (ip6_udp_hdr->udp.src_port);
}
}
always_inline uword
wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame, u8 is_ip4, u16 async_next_node)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_interface_main_t *im = &vnm->interface_main;
wg_main_t *wmp = &wg_main;
wg_per_thread_data_t *ptd =
vec_elt_at_index (wmp->per_thread_data, vm->thread_index);
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from = frame->n_vectors;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u32 thread_index = vm->thread_index;
vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops;
const u16 drop_next = WG_INPUT_NEXT_PUNT;
message_type_t header_type;
vlib_buffer_t *data_bufs[VLIB_FRAME_SIZE];
u32 data_bi[VLIB_FRAME_SIZE]; /* buffer index for data */
u32 other_bi[VLIB_FRAME_SIZE]; /* buffer index for drop or handoff */
u16 other_nexts[VLIB_FRAME_SIZE], *other_next = other_nexts, n_other = 0;
u16 data_nexts[VLIB_FRAME_SIZE], *data_next = data_nexts, n_data = 0;
u16 n_async = 0;
const u8 is_async = wg_op_mode_is_set_ASYNC ();
vnet_crypto_async_frame_t *async_frame = NULL;
vlib_get_buffers (vm, from, bufs, n_left_from);
vec_reset_length (ptd->crypto_ops);
vec_reset_length (ptd->async_frames);
f64 time = clib_time_now (&vm->clib_time) + vm->time_offset;
wg_peer_t *peer = NULL;
u32 *last_peer_time_idx = NULL;
u32 last_rec_idx = ~0;
bool is_keepalive = false;
u32 *peer_idx = NULL;
while (n_left_from > 0)
{
if (n_left_from > 2)
{
u8 *p;
vlib_prefetch_buffer_header (b[2], LOAD);
p = vlib_buffer_get_current (b[1]);
CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (vlib_buffer_get_tail (b[1]), CLIB_CACHE_LINE_BYTES,
LOAD);
}
other_next[n_other] = WG_INPUT_NEXT_PUNT;
data_nexts[n_data] = WG_INPUT_N_NEXT;
header_type =
((message_header_t *) vlib_buffer_get_current (b[0]))->type;
if (PREDICT_TRUE (header_type == MESSAGE_DATA))
{
message_data_t *data = vlib_buffer_get_current (b[0]);
u8 *iv_data = b[0]->pre_data;
u32 buf_idx = from[b - bufs];
peer_idx = wg_index_table_lookup (&wmp->index_table,
data->receiver_index);
if (data->receiver_index != last_rec_idx)
{
peer_idx = wg_index_table_lookup (&wmp->index_table,
data->receiver_index);
if (PREDICT_TRUE (peer_idx != NULL))
{
peer = wg_peer_get (*peer_idx);
}
last_rec_idx = data->receiver_index;
}
if (PREDICT_FALSE (!peer_idx))
{
other_next[n_other] = WG_INPUT_NEXT_ERROR;
b[0]->error = node->errors[WG_INPUT_ERROR_PEER];
other_bi[n_other] = buf_idx;
n_other += 1;
goto out;
}
if (PREDICT_FALSE (~0 == peer->input_thread_index))
{
/* this is the first packet to use this peer, claim the peer
* for this thread.
*/
clib_atomic_cmp_and_swap (&peer->input_thread_index, ~0,
wg_peer_assign_thread (thread_index));
}
if (PREDICT_TRUE (thread_index != peer->input_thread_index))
{
other_next[n_other] = WG_INPUT_NEXT_HANDOFF_DATA;
other_bi[n_other] = buf_idx;
n_other += 1;
goto next;
}
u16 encr_len = b[0]->current_length - sizeof (message_data_t);
u16 decr_len = encr_len - NOISE_AUTHTAG_LEN;
if (PREDICT_FALSE (decr_len >= WG_DEFAULT_DATA_SIZE))
{
b[0]->error = node->errors[WG_INPUT_ERROR_TOO_BIG];
other_bi[n_other] = buf_idx;
n_other += 1;
goto out;
}
enum noise_state_crypt state_cr = wg_input_process (
vm, ptd, crypto_ops, &async_frame, b[0], buf_idx, &peer->remote,
data->receiver_index, data->counter, data->encrypted_data,
decr_len, data->encrypted_data, n_data, iv_data, time, is_async,
async_next_node);
if (PREDICT_FALSE (state_cr == SC_FAILED))
{
wg_peer_update_flags (*peer_idx, WG_PEER_ESTABLISHED, false);
other_next[n_other] = WG_INPUT_NEXT_ERROR;
b[0]->error = node->errors[WG_INPUT_ERROR_DECRYPTION];
other_bi[n_other] = buf_idx;
n_other += 1;
goto out;
}
if (!is_async)
{
data_bufs[n_data] = b[0];
data_bi[n_data] = buf_idx;
n_data += 1;
}
else
{
n_async += 1;
}
if (PREDICT_FALSE (state_cr == SC_CONN_RESET))
{
wg_timers_handshake_complete (peer);
goto next;
}
else if (PREDICT_FALSE (state_cr == SC_KEEP_KEY_FRESH))
{
wg_send_handshake_from_mt (*peer_idx, false);
goto next;
}
else if (PREDICT_TRUE (state_cr == SC_OK))
goto next;
}
else
{
/* Handshake packets should be processed in main thread */
if (thread_index != 0)
{
other_next[n_other] = WG_INPUT_NEXT_HANDOFF_HANDSHAKE;
other_bi[n_other] = from[b - bufs];
n_other += 1;
goto next;
}
wg_input_error_t ret =
wg_handshake_process (vm, wmp, b[0], node->node_index, is_ip4);
if (ret != WG_INPUT_ERROR_NONE)
{
other_next[n_other] = WG_INPUT_NEXT_ERROR;
b[0]->error = node->errors[ret];
other_bi[n_other] = from[b - bufs];
n_other += 1;
}
else
{
other_bi[n_other] = from[b - bufs];
n_other += 1;
}
}
out:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
wg_input_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
t->type = header_type;
t->current_length = b[0]->current_length;
t->is_keepalive = is_keepalive;
t->peer = peer_idx ? *peer_idx : INDEX_INVALID;
}
next:
n_left_from -= 1;
b += 1;
}
/* decrypt packets */
wg_input_process_ops (vm, node, ptd->crypto_ops, data_bufs, data_nexts,
drop_next);
/* process after decryption */
b = data_bufs;
n_left_from = n_data;
last_rec_idx = ~0;
last_peer_time_idx = NULL;
while (n_left_from > 0)
{
bool is_keepalive = false;
u32 *peer_idx = NULL;
if (PREDICT_FALSE (data_next[0] == WG_INPUT_NEXT_PUNT))
{
goto trace;
}
if (n_left_from > 2)
{
u8 *p;
vlib_prefetch_buffer_header (b[2], LOAD);
p = vlib_buffer_get_current (b[1]);
CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (vlib_buffer_get_tail (b[1]), CLIB_CACHE_LINE_BYTES,
LOAD);
}
message_data_t *data = vlib_buffer_get_current (b[0]);
ip46_address_t out_src_ip;
u16 out_udp_src_port;
wg_find_outer_addr_port (b[0], &out_src_ip, &out_udp_src_port, is_ip4);
if (data->receiver_index != last_rec_idx)
{
peer_idx =
wg_index_table_lookup (&wmp->index_table, data->receiver_index);
peer = wg_peer_get (*peer_idx);
last_rec_idx = data->receiver_index;
}
if (PREDICT_FALSE (wg_input_post_process (vm, b[0], data_next, peer,
data, &is_keepalive) < 0))
goto trace;
if (PREDICT_FALSE (peer_idx && (last_peer_time_idx != peer_idx)))
{
if (PREDICT_FALSE (
!ip46_address_is_equal (&peer->dst.addr, &out_src_ip) ||
peer->dst.port != out_udp_src_port))
wg_peer_update_endpoint_from_mt (*peer_idx, &out_src_ip,
out_udp_src_port);
wg_timers_any_authenticated_packet_received_opt (peer, time);
wg_timers_any_authenticated_packet_traversal (peer);
last_peer_time_idx = peer_idx;
}
vlib_increment_combined_counter (im->combined_sw_if_counters +
VNET_INTERFACE_COUNTER_RX,
vm->thread_index, peer->wg_sw_if_index,
1 /* packets */, b[0]->current_length);
trace:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
wg_input_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
t->type = header_type;
t->current_length = b[0]->current_length;
t->is_keepalive = is_keepalive;
t->peer = peer_idx ? *peer_idx : INDEX_INVALID;
}
b += 1;
n_left_from -= 1;
data_next += 1;
}
if (n_async)
{
/* submit all of the open frames */
vnet_crypto_async_frame_t **async_frame;
vec_foreach (async_frame, ptd->async_frames)
{
if (PREDICT_FALSE (
vnet_crypto_async_submit_open_frame (vm, *async_frame) < 0))
{
u32 n_drop = (*async_frame)->n_elts;
u32 *bi = (*async_frame)->buffer_indices;
u16 index = n_other;
while (n_drop--)
{
other_bi[index] = bi[0];
vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
other_nexts[index] = drop_next;
b->error = node->errors[WG_INPUT_ERROR_CRYPTO_ENGINE_ERROR];
bi++;
index++;
}
n_other += (*async_frame)->n_elts;
vnet_crypto_async_reset_frame (*async_frame);
vnet_crypto_async_free_frame (vm, *async_frame);
}
}
}
/* enqueue other bufs */
if (n_other)
vlib_buffer_enqueue_to_next (vm, node, other_bi, other_next, n_other);
/* enqueue data bufs */
if (n_data)
vlib_buffer_enqueue_to_next (vm, node, data_bi, data_nexts, n_data);
return frame->n_vectors;
}
always_inline uword
wg_input_post (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame,
u8 is_ip4)
{
vnet_main_t *vnm = vnet_get_main ();
vnet_interface_main_t *im = &vnm->interface_main;
wg_main_t *wmp = &wg_main;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
u16 nexts[VLIB_FRAME_SIZE], *next = nexts;
u32 *from = vlib_frame_vector_args (frame);
u32 n_left = frame->n_vectors;
wg_peer_t *peer = NULL;
u32 *peer_idx = NULL;
u32 *last_peer_time_idx = NULL;
u32 last_rec_idx = ~0;
f64 time = clib_time_now (&vm->clib_time) + vm->time_offset;
vlib_get_buffers (vm, from, b, n_left);
if (n_left >= 2)
{
vlib_prefetch_buffer_header (b[0], LOAD);
vlib_prefetch_buffer_header (b[1], LOAD);
}
while (n_left > 0)
{
if (n_left > 2)
{
u8 *p;
vlib_prefetch_buffer_header (b[2], LOAD);
p = vlib_buffer_get_current (b[1]);
CLIB_PREFETCH (p, CLIB_CACHE_LINE_BYTES, LOAD);
}
bool is_keepalive = false;
message_data_t *data = vlib_buffer_get_current (b[0]);
ip46_address_t out_src_ip;
u16 out_udp_src_port;
wg_find_outer_addr_port (b[0], &out_src_ip, &out_udp_src_port, is_ip4);
if (data->receiver_index != last_rec_idx)
{
peer_idx =
wg_index_table_lookup (&wmp->index_table, data->receiver_index);
peer = wg_peer_get (*peer_idx);
last_rec_idx = data->receiver_index;
}
if (PREDICT_TRUE (peer != NULL))
{
if (PREDICT_FALSE (wg_input_post_process (vm, b[0], next, peer, data,
&is_keepalive) < 0))
goto trace;
}
else
{
next[0] = WG_INPUT_NEXT_PUNT;
goto trace;
}
if (PREDICT_FALSE (peer_idx && (last_peer_time_idx != peer_idx)))
{
if (PREDICT_FALSE (
!ip46_address_is_equal (&peer->dst.addr, &out_src_ip) ||
peer->dst.port != out_udp_src_port))
wg_peer_update_endpoint_from_mt (*peer_idx, &out_src_ip,
out_udp_src_port);
wg_timers_any_authenticated_packet_received_opt (peer, time);
wg_timers_any_authenticated_packet_traversal (peer);
last_peer_time_idx = peer_idx;
}
vlib_increment_combined_counter (im->combined_sw_if_counters +
VNET_INTERFACE_COUNTER_RX,
vm->thread_index, peer->wg_sw_if_index,
1 /* packets */, b[0]->current_length);
trace:
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b[0]->flags & VLIB_BUFFER_IS_TRACED)))
{
wg_input_post_trace_t *t =
vlib_add_trace (vm, node, b[0], sizeof (*t));
t->next = next[0];
t->peer = peer_idx ? *peer_idx : INDEX_INVALID;
}
b += 1;
next += 1;
n_left -= 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
return frame->n_vectors;
}
VLIB_NODE_FN (wg4_input_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return wg_input_inline (vm, node, frame, /* is_ip4 */ 1,
wg_decrypt_async_next.wg4_post_next);
}
VLIB_NODE_FN (wg6_input_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
return wg_input_inline (vm, node, frame, /* is_ip4 */ 0,
wg_decrypt_async_next.wg6_post_next);
}
VLIB_NODE_FN (wg4_input_post_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
{
return wg_input_post (vm, node, from_frame, /* is_ip4 */ 1);
}
VLIB_NODE_FN (wg6_input_post_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
{
return wg_input_post (vm, node, from_frame, /* is_ip4 */ 0);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (wg4_input_node) =
{
.name = "wg4-input",
.vector_size = sizeof (u32),
.format_trace = format_wg_input_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (wg_input_error_strings),
.error_strings = wg_input_error_strings,
.n_next_nodes = WG_INPUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[WG_INPUT_NEXT_HANDOFF_HANDSHAKE] = "wg4-handshake-handoff",
[WG_INPUT_NEXT_HANDOFF_DATA] = "wg4-input-data-handoff",
[WG_INPUT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
[WG_INPUT_NEXT_IP6_INPUT] = "ip6-input",
[WG_INPUT_NEXT_PUNT] = "error-punt",
[WG_INPUT_NEXT_ERROR] = "error-drop",
},
};
VLIB_REGISTER_NODE (wg6_input_node) =
{
.name = "wg6-input",
.vector_size = sizeof (u32),
.format_trace = format_wg_input_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (wg_input_error_strings),
.error_strings = wg_input_error_strings,
.n_next_nodes = WG_INPUT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[WG_INPUT_NEXT_HANDOFF_HANDSHAKE] = "wg6-handshake-handoff",
[WG_INPUT_NEXT_HANDOFF_DATA] = "wg6-input-data-handoff",
[WG_INPUT_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
[WG_INPUT_NEXT_IP6_INPUT] = "ip6-input",
[WG_INPUT_NEXT_PUNT] = "error-punt",
[WG_INPUT_NEXT_ERROR] = "error-drop",
},
};
VLIB_REGISTER_NODE (wg4_input_post_node) = {
.name = "wg4-input-post-node",
.vector_size = sizeof (u32),
.format_trace = format_wg_input_post_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "wg4-input",
.n_errors = ARRAY_LEN (wg_input_error_strings),
.error_strings = wg_input_error_strings,
};
VLIB_REGISTER_NODE (wg6_input_post_node) = {
.name = "wg6-input-post-node",
.vector_size = sizeof (u32),
.format_trace = format_wg_input_post_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.sibling_of = "wg6-input",
.n_errors = ARRAY_LEN (wg_input_error_strings),
.error_strings = wg_input_error_strings,
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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