_ (HANDSHAKE_RECEIVE, "Failed while receiving Handshake") \
_ (COOKIE_DECRYPTION, "Failed during Cookie decryption") \
_ (COOKIE_SEND, "Failed during sending Cookie") \
- _ (TOO_BIG, "Packet too big") \
+ _ (NO_BUFFERS, "No buffers") \
_ (UNDEFINED, "Undefined error") \
_ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)")
{
next[0] = WG_INPUT_NEXT_PUNT;
noise_keypair_t *kp;
+ vlib_buffer_t *lb;
if ((kp = wg_get_active_keypair (&peer->remote, data->receiver_index)) ==
NULL)
return -1;
}
- u16 encr_len = b->current_length - sizeof (message_data_t);
+ lb = b;
+ /* Find last buffer in the chain */
+ while (lb->flags & VLIB_BUFFER_NEXT_PRESENT)
+ lb = vlib_get_buffer (vm, lb->next_buffer);
+
+ u16 encr_len = vlib_buffer_length_in_chain (vm, b) - 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;
+ vlib_buffer_chain_increase_length (b, lb, -NOISE_AUTHTAG_LEN);
vnet_buffer_offload_flags_clear (b, VNET_BUFFER_OFFLOAD_F_UDP_CKSUM);
/* Keepalive packet has zero length */
}
}
+static_always_inline void
+wg_input_process_chained_ops (vlib_main_t *vm, vlib_node_runtime_t *node,
+ vnet_crypto_op_t *ops, vlib_buffer_t *b[],
+ u16 *nexts, vnet_crypto_op_chunk_t *chunks,
+ 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_chained_ops (vm, op, chunks, 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++;
+ }
+}
+
+static_always_inline void
+wg_input_chain_crypto (vlib_main_t *vm, wg_per_thread_data_t *ptd,
+ vlib_buffer_t *b, vlib_buffer_t *lb, u8 *start,
+ u32 start_len, u16 *n_ch)
+{
+ vnet_crypto_op_chunk_t *ch;
+ vlib_buffer_t *cb = b;
+ u32 n_chunks = 1;
+
+ vec_add2 (ptd->chunks, ch, 1);
+ ch->len = start_len;
+ ch->src = ch->dst = start;
+ cb = vlib_get_buffer (vm, cb->next_buffer);
+
+ while (1)
+ {
+ vec_add2 (ptd->chunks, ch, 1);
+ n_chunks += 1;
+ if (lb == cb)
+ ch->len = cb->current_length - NOISE_AUTHTAG_LEN;
+ else
+ ch->len = cb->current_length;
+
+ ch->src = ch->dst = vlib_buffer_get_current (cb);
+
+ if (!(cb->flags & VLIB_BUFFER_NEXT_PRESENT))
+ break;
+
+ cb = vlib_get_buffer (vm, cb->next_buffer);
+ }
+
+ if (n_ch)
+ *n_ch = n_chunks;
+}
+
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,
+wg_prepare_sync_dec_op (vlib_main_t *vm, wg_per_thread_data_t *ptd,
+ vlib_buffer_t *b, vlib_buffer_t *lb,
+ 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;
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->tag = vlib_buffer_get_tail (lb) - NOISE_AUTHTAG_LEN;
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;
+
+ if (b != lb)
+ {
+ /* Chained buffers */
+ op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+ op->chunk_index = vec_len (ptd->chunks);
+ wg_input_chain_crypto (vm, ptd, b, lb, src, src_len + NOISE_AUTHTAG_LEN,
+ &op->n_chunks);
+ }
+ else
+ {
+ op->src = !src ? src_ : src;
+ op->len = src_len;
+ op->dst = dst;
+ }
}
static_always_inline void
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)
+ vlib_buffer_t *lb, u32 buf_idx, noise_remote_t *r,
+ uint32_t r_idx, uint64_t nonce, uint8_t *src, size_t srclen,
+ size_t srclen_total, 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 (is_async)
{
+ u8 flags = VNET_CRYPTO_OP_FLAG_HMAC_CHECK;
+ u8 *tag = vlib_buffer_get_tail (lb) - NOISE_AUTHTAG_LEN;
+
+ if (b != lb)
+ flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS;
+
if (NULL == *async_frame ||
vnet_crypto_async_frame_is_full (*async_frame))
{
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);
+ wg_input_add_to_frame (vm, *async_frame, kp->kp_recv_index, srclen_total,
+ src - b->data, buf_idx, async_next_node, iv, tag,
+ flags);
}
else
{
- wg_prepare_sync_dec_op (vm, crypto_ops, src, srclen, dst, NULL, 0,
- kp->kp_recv_index, from_idx, iv);
+ wg_prepare_sync_dec_op (vm, ptd, b, lb, 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
u32 n_left_from = frame->n_vectors;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
+ vlib_buffer_t *lb;
u32 thread_index = vm->thread_index;
- vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops;
+ vnet_crypto_op_t **crypto_ops;
const u16 drop_next = WG_INPUT_NEXT_PUNT;
message_type_t header_type;
vlib_buffer_t *data_bufs[VLIB_FRAME_SIZE];
vlib_get_buffers (vm, from, bufs, n_left_from);
vec_reset_length (ptd->crypto_ops);
+ vec_reset_length (ptd->chained_crypto_ops);
+ vec_reset_length (ptd->chunks);
vec_reset_length (ptd->async_frames);
f64 time = clib_time_now (&vm->clib_time) + vm->time_offset;
message_data_t *data = vlib_buffer_get_current (b[0]);
u8 *iv_data = b[0]->pre_data;
u32 buf_idx = from[b - bufs];
+ u32 n_bufs;
peer_idx = wg_index_table_lookup (&wmp->index_table,
data->receiver_index);
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))
+ lb = b[0];
+ n_bufs = vlib_buffer_chain_linearize (vm, b[0]);
+ if (n_bufs == 0)
{
- b[0]->error = node->errors[WG_INPUT_ERROR_TOO_BIG];
+ other_next[n_other] = WG_INPUT_NEXT_ERROR;
+ b[0]->error = node->errors[WG_INPUT_ERROR_NO_BUFFERS];
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 (n_bufs > 1)
+ {
+ vlib_buffer_t *before_last = b[0];
+
+ /* Find last and before last buffer in the chain */
+ while (lb->flags & VLIB_BUFFER_NEXT_PRESENT)
+ {
+ before_last = lb;
+ lb = vlib_get_buffer (vm, lb->next_buffer);
+ }
+
+ /* Ensure auth tag is contiguous and not splitted into two last
+ * buffers */
+ if (PREDICT_FALSE (lb->current_length < NOISE_AUTHTAG_LEN))
+ {
+ u32 len_diff = NOISE_AUTHTAG_LEN - lb->current_length;
+
+ before_last->current_length -= len_diff;
+ if (before_last == b[0])
+ before_last->flags &= ~VLIB_BUFFER_TOTAL_LENGTH_VALID;
+
+ vlib_buffer_advance (lb, (signed) -len_diff);
+
+ clib_memcpy_fast (vlib_buffer_get_current (lb),
+ vlib_buffer_get_tail (before_last),
+ len_diff);
+ }
+ }
+
+ u16 encr_len = b[0]->current_length - sizeof (message_data_t);
+ u16 decr_len = encr_len - NOISE_AUTHTAG_LEN;
+ u16 encr_len_total =
+ vlib_buffer_length_in_chain (vm, b[0]) - sizeof (message_data_t);
+ u16 decr_len_total = encr_len_total - NOISE_AUTHTAG_LEN;
+
+ if (lb != b[0])
+ crypto_ops = &ptd->chained_crypto_ops;
+ else
+ crypto_ops = &ptd->crypto_ops;
+
+ enum noise_state_crypt state_cr =
+ wg_input_process (vm, ptd, crypto_ops, &async_frame, b[0], lb,
+ buf_idx, &peer->remote, data->receiver_index,
+ data->counter, data->encrypted_data, decr_len,
+ decr_len_total, data->encrypted_data, n_data,
+ iv_data, time, is_async, async_next_node);
if (PREDICT_FALSE (state_cr == SC_FAILED))
{
/* decrypt packets */
wg_input_process_ops (vm, node, ptd->crypto_ops, data_bufs, data_nexts,
drop_next);
+ wg_input_process_chained_ops (vm, node, ptd->chained_crypto_ops, data_bufs,
+ data_nexts, ptd->chunks, drop_next);
/* process after decryption */
b = data_bufs;
Code Review / vpp.git / blobdiff