diff options
Diffstat (limited to 'src/plugins/wireguard/wireguard_input.c')
| -rw-r--r-- | src/plugins/wireguard/wireguard_input.c | 194 |
1 files changed, 166 insertions, 28 deletions
diff --git a/src/plugins/wireguard/wireguard_input.c b/src/plugins/wireguard/wireguard_input.c index 6b8c803c97d..db37fa54175 100644 --- a/src/plugins/wireguard/wireguard_input.c +++ b/src/plugins/wireguard/wireguard_input.c @@ -34,7 +34,7 @@ _ (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)") @@ -340,6 +340,7 @@ wg_input_post_process (vlib_main_t *vm, vlib_buffer_t *b, u16 *next, { 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) @@ -350,11 +351,16 @@ wg_input_post_process (vlib_main_t *vm, vlib_buffer_t *b, u16 *next, 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 */ @@ -433,9 +439,75 @@ wg_input_process_ops (vlib_main_t *vm, vlib_node_runtime_t *node, } } +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; @@ -445,16 +517,28 @@ wg_prepare_sync_dec_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, 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 @@ -485,10 +569,10 @@ 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) + 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; @@ -516,6 +600,12 @@ wg_input_process (vlib_main_t *vm, wg_per_thread_data_t *ptd, 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)) { @@ -525,14 +615,14 @@ wg_input_process (vlib_main_t *vm, wg_per_thread_data_t *ptd, 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 @@ -605,8 +695,9 @@ wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, 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]; @@ -620,6 +711,8 @@ wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, 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; @@ -655,6 +748,7 @@ wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, 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); @@ -701,21 +795,63 @@ wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, 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)) { @@ -796,6 +932,8 @@ wg_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node, /* 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; |