diff options
Diffstat (limited to 'src/plugins/wireguard/wireguard_output_tun.c')
| -rw-r--r-- | src/plugins/wireguard/wireguard_output_tun.c | 235 |
1 files changed, 184 insertions, 51 deletions
diff --git a/src/plugins/wireguard/wireguard_output_tun.c b/src/plugins/wireguard/wireguard_output_tun.c index 4d85a5912d6..4ff1621b4a3 100644 --- a/src/plugins/wireguard/wireguard_output_tun.c +++ b/src/plugins/wireguard/wireguard_output_tun.c @@ -25,7 +25,7 @@ _ (NONE, "No error") \ _ (PEER, "Peer error") \ _ (KEYPAIR, "Keypair error") \ - _ (TOO_BIG, "packet too big") \ + _ (NO_BUFFERS, "No buffers") \ _ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") typedef enum @@ -115,10 +115,46 @@ format_wg_output_tun_post_trace (u8 *s, va_list *args) } static_always_inline void -wg_prepare_sync_enc_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, - u8 *src, u32 src_len, u8 *dst, u8 *aad, u32 aad_len, - u64 nonce, vnet_crypto_key_index_t key_index, u32 bi, - u8 *iv) +wg_output_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; +} + +static_always_inline void +wg_prepare_sync_enc_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, u64 nonce, + vnet_crypto_key_index_t key_index, u32 bi, u8 *iv) { vnet_crypto_op_t _op, *op = &_op; u8 src_[] = {}; @@ -130,15 +166,55 @@ wg_prepare_sync_enc_op (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, vnet_crypto_op_init (op, VNET_CRYPTO_OP_CHACHA20_POLY1305_ENC); op->tag_len = NOISE_AUTHTAG_LEN; - op->tag = dst + 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; + + if (b != lb) + { + /* Chained buffers */ + op->flags |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + op->chunk_index = vec_len (ptd->chunks); + wg_output_chain_crypto (vm, ptd, b, lb, src, src_len, &op->n_chunks); + } + else + { + op->src = !src ? src_ : src; + op->len = src_len; + op->dst = dst; + } +} + +static_always_inline void +wg_output_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_OUTPUT_ERROR_CRYPTO_ENGINE_ERROR]; + nexts[bi] = drop_next; + n_fail--; + } + op++; + } } static_always_inline void @@ -194,10 +270,11 @@ wg_output_tun_add_to_frame (vlib_main_t *vm, vnet_crypto_async_frame_t *f, } static_always_inline enum noise_state_crypt -wq_output_tun_process (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, - noise_remote_t *r, uint32_t *r_idx, uint64_t *nonce, - uint8_t *src, size_t srclen, uint8_t *dst, u32 bi, - u8 *iv, f64 time) +wg_output_tun_process (vlib_main_t *vm, wg_per_thread_data_t *ptd, + vlib_buffer_t *b, vlib_buffer_t *lb, + vnet_crypto_op_t **crypto_ops, noise_remote_t *r, + uint32_t *r_idx, uint64_t *nonce, uint8_t *src, + size_t srclen, uint8_t *dst, u32 bi, u8 *iv, f64 time) { noise_keypair_t *kp; enum noise_state_crypt ret = SC_FAILED; @@ -223,8 +300,8 @@ wq_output_tun_process (vlib_main_t *vm, vnet_crypto_op_t **crypto_ops, * are passed back out to the caller through the provided data pointer. */ *r_idx = kp->kp_remote_index; - wg_prepare_sync_enc_op (vm, crypto_ops, src, srclen, dst, NULL, 0, *nonce, - kp->kp_send_index, bi, iv); + wg_prepare_sync_enc_op (vm, ptd, b, lb, crypto_ops, src, srclen, dst, NULL, + 0, *nonce, kp->kp_send_index, bi, iv); /* If our values are still within tolerances, but we are approaching * the tolerances, we notify the caller with ESTALE that they should @@ -247,12 +324,14 @@ error: static_always_inline enum noise_state_crypt wg_add_to_async_frame (vlib_main_t *vm, wg_per_thread_data_t *ptd, vnet_crypto_async_frame_t **async_frame, - vlib_buffer_t *b, u8 *payload, u32 payload_len, u32 bi, - u16 next, u16 async_next, noise_remote_t *r, - uint32_t *r_idx, uint64_t *nonce, u8 *iv, f64 time) + vlib_buffer_t *b, vlib_buffer_t *lb, u8 *payload, + u32 payload_len, u32 bi, u16 next, u16 async_next, + noise_remote_t *r, uint32_t *r_idx, uint64_t *nonce, + u8 *iv, f64 time) { wg_post_data_t *post = wg_post_data (b); u8 flag = 0; + u8 *tag; noise_keypair_t *kp; post->next_index = next; @@ -293,10 +372,15 @@ wg_add_to_async_frame (vlib_main_t *vm, wg_per_thread_data_t *ptd, vec_add1 (ptd->async_frames, *async_frame); } + if (b != lb) + flag |= VNET_CRYPTO_OP_FLAG_CHAINED_BUFFERS; + + tag = vlib_buffer_get_tail (lb) - NOISE_AUTHTAG_LEN; + /* this always succeeds because we know the frame is not full */ wg_output_tun_add_to_frame (vm, *async_frame, kp->kp_send_index, payload_len, - payload - b->data, bi, async_next, iv, - payload + payload_len, flag); + payload - b->data, bi, async_next, iv, tag, + flag); /* If our values are still within tolerances, but we are approaching * the tolerances, we notify the caller with ESTALE that they should @@ -346,7 +430,8 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, ip6_udp_wg_header_t *hdr6_out = NULL; message_data_t *message_data_wg = NULL; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; - vnet_crypto_op_t **crypto_ops = &ptd->crypto_ops; + vlib_buffer_t *lb; + vnet_crypto_op_t **crypto_ops; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; vlib_buffer_t *sync_bufs[VLIB_FRAME_SIZE]; u32 thread_index = vm->thread_index; @@ -362,6 +447,8 @@ wg_output_tun_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); wg_peer_t *peer = NULL; @@ -377,6 +464,10 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, u8 is_ip4_out = 1; u8 *plain_data; u16 plain_data_len; + u16 plain_data_len_total; + u16 n_bufs; + u16 b_space_left_at_beginning; + u32 bi = from[b - bufs]; if (n_left_from > 2) { @@ -432,34 +523,72 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, goto out; } - iph_offset = vnet_buffer (b[0])->ip.save_rewrite_length; - plain_data_len = vlib_buffer_length_in_chain (vm, b[0]) - iph_offset; - u8 *iv_data = b[0]->pre_data; + lb = b[0]; + n_bufs = vlib_buffer_chain_linearize (vm, b[0]); + if (n_bufs == 0) + { + b[0]->error = node->errors[WG_OUTPUT_ERROR_NO_BUFFERS]; + goto out; + } - size_t encrypted_packet_len = message_data_len (plain_data_len); + if (n_bufs > 1) + { + /* Find last buffer in the chain */ + while (lb->flags & VLIB_BUFFER_NEXT_PRESENT) + lb = vlib_get_buffer (vm, lb->next_buffer); + } - /* - * Ensure there is enough space to write the encrypted data - * into the packet + /* Ensure there is enough free space at the beginning of the first buffer + * to write ethernet header (e.g. IPv6 VxLAN over IPv6 Wireguard will + * trigger this) */ - if (PREDICT_FALSE (encrypted_packet_len >= WG_DEFAULT_DATA_SIZE) || - PREDICT_FALSE ((iph_offset + encrypted_packet_len) >= - vlib_buffer_get_default_data_size (vm))) + ASSERT ((signed) b[0]->current_data >= + (signed) -VLIB_BUFFER_PRE_DATA_SIZE); + b_space_left_at_beginning = + b[0]->current_data + VLIB_BUFFER_PRE_DATA_SIZE; + if (PREDICT_FALSE (b_space_left_at_beginning < + sizeof (ethernet_header_t))) { - b[0]->error = node->errors[WG_OUTPUT_ERROR_TOO_BIG]; - goto out; + u32 size_diff = + sizeof (ethernet_header_t) - b_space_left_at_beginning; + + /* Can only move buffer when it's single and has enough free space*/ + if (lb == b[0] && + vlib_buffer_space_left_at_end (vm, b[0]) >= size_diff) + { + vlib_buffer_move (vm, b[0], + b[0]->current_data + (signed) size_diff); + } + else + { + b[0]->error = node->errors[WG_OUTPUT_ERROR_NO_BUFFERS]; + goto out; + } } /* - * Move the buffer to fit ethernet header - */ - if (b[0]->current_data + VLIB_BUFFER_PRE_DATA_SIZE < - sizeof (ethernet_header_t)) + * Ensure there is enough free space at the end of the last buffer to + * write auth tag */ + if (PREDICT_FALSE (vlib_buffer_space_left_at_end (vm, lb) < + NOISE_AUTHTAG_LEN)) { - vlib_buffer_move (vm, b[0], 0); + u32 tmp_bi = 0; + if (vlib_buffer_alloc (vm, &tmp_bi, 1) != 1) + { + b[0]->error = node->errors[WG_OUTPUT_ERROR_NO_BUFFERS]; + goto out; + } + lb = vlib_buffer_chain_buffer (vm, lb, tmp_bi); } + iph_offset = vnet_buffer (b[0])->ip.save_rewrite_length; plain_data = vlib_buffer_get_current (b[0]) + iph_offset; + plain_data_len = b[0]->current_length - iph_offset; + plain_data_len_total = + vlib_buffer_length_in_chain (vm, b[0]) - iph_offset; + size_t encrypted_packet_len = message_data_len (plain_data_len_total); + vlib_buffer_chain_increase_length (b[0], lb, NOISE_AUTHTAG_LEN); + u8 *iv_data = b[0]->pre_data; is_ip4_out = ip46_address_is_ip4 (&peer->src.addr); if (is_ip4_out) @@ -484,22 +613,27 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, /* Here we are sure that can send packet to next node */ next[0] = WG_OUTPUT_NEXT_INTERFACE_OUTPUT; + if (lb != b[0]) + crypto_ops = &ptd->chained_crypto_ops; + else + crypto_ops = &ptd->crypto_ops; + enum noise_state_crypt state; if (is_async) { state = wg_add_to_async_frame ( - vm, ptd, &async_frame, b[0], plain_data, plain_data_len, - from[b - bufs], next[0], async_next_node, &peer->remote, + vm, ptd, &async_frame, b[0], lb, plain_data, plain_data_len_total, + bi, next[0], async_next_node, &peer->remote, &message_data_wg->receiver_index, &message_data_wg->counter, iv_data, time); } else { - state = wq_output_tun_process ( - vm, crypto_ops, &peer->remote, &message_data_wg->receiver_index, - &message_data_wg->counter, plain_data, plain_data_len, plain_data, - n_sync, iv_data, time); + state = wg_output_tun_process ( + vm, ptd, b[0], lb, crypto_ops, &peer->remote, + &message_data_wg->receiver_index, &message_data_wg->counter, + plain_data, plain_data_len, plain_data, n_sync, iv_data, time); } if (PREDICT_FALSE (state == SC_KEEP_KEY_FRESH)) @@ -522,10 +656,9 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, hdr4_out->wg.header.type = MESSAGE_DATA; hdr4_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len + sizeof (udp_header_t)); - b[0]->current_length = - (encrypted_packet_len + sizeof (ip4_udp_header_t)); ip4_header_set_len_w_chksum ( - &hdr4_out->ip4, clib_host_to_net_u16 (b[0]->current_length)); + &hdr4_out->ip4, clib_host_to_net_u16 (encrypted_packet_len + + sizeof (ip4_udp_header_t))); } else { @@ -533,8 +666,6 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, hdr6_out->ip6.payload_length = hdr6_out->udp.length = clib_host_to_net_u16 (encrypted_packet_len + sizeof (udp_header_t)); - b[0]->current_length = - (encrypted_packet_len + sizeof (ip6_udp_header_t)); } out: @@ -555,14 +686,14 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, next: if (PREDICT_FALSE (err != WG_OUTPUT_NEXT_INTERFACE_OUTPUT)) { - noop_bi[n_noop] = from[b - bufs]; + noop_bi[n_noop] = bi; n_noop++; noop_next++; goto next_left; } if (!is_async) { - sync_bi[n_sync] = from[b - bufs]; + sync_bi[n_sync] = bi; sync_bufs[n_sync] = b[0]; n_sync += 1; next += 1; @@ -581,6 +712,8 @@ wg_output_tun_inline (vlib_main_t *vm, vlib_node_runtime_t *node, /* wg-output-process-ops */ wg_output_process_ops (vm, node, ptd->crypto_ops, sync_bufs, nexts, drop_next); + wg_output_process_chained_ops (vm, node, ptd->chained_crypto_ops, + sync_bufs, nexts, ptd->chunks, drop_next); int n_left_from_sync_bufs = n_sync; while (n_left_from_sync_bufs > 0) |