Line data    Source code

       1             : /*
       2             :  *
       3             :  * Copyright 2015, Google Inc.
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions are
       8             :  * met:
       9             :  *
      10             :  *     * Redistributions of source code must retain the above copyright
      11             :  * notice, this list of conditions and the following disclaimer.
      12             :  *     * Redistributions in binary form must reproduce the above
      13             :  * copyright notice, this list of conditions and the following disclaimer
      14             :  * in the documentation and/or other materials provided with the
      15             :  * distribution.
      16             :  *     * Neither the name of Google Inc. nor the names of its
      17             :  * contributors may be used to endorse or promote products derived from
      18             :  * this software without specific prior written permission.
      19             :  *
      20             :  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      21             :  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      22             :  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      23             :  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      24             :  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      25             :  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      26             :  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      27             :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      28             :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      29             :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      30             :  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      31             :  *
      32             :  */
      33             : 
      34             : #include "src/core/transport/chttp2/frame_window_update.h"
      35             : #include "src/core/transport/chttp2/internal.h"
      36             : 
      37             : #include <grpc/support/log.h>
      38             : 
      39       35397 : gpr_slice grpc_chttp2_window_update_create(gpr_uint32 id,
      40             :                                            gpr_uint32 window_update) {
      41       35397 :   gpr_slice slice = gpr_slice_malloc(13);
      42       35396 :   gpr_uint8 *p = GPR_SLICE_START_PTR(slice);
      43             : 
      44       35396 :   GPR_ASSERT(window_update);
      45             : 
      46       35396 :   *p++ = 0;
      47       35396 :   *p++ = 0;
      48       35396 :   *p++ = 4;
      49       35396 :   *p++ = GRPC_CHTTP2_FRAME_WINDOW_UPDATE;
      50       35396 :   *p++ = 0;
      51       35396 :   *p++ = (gpr_uint8)(id >> 24);
      52       35396 :   *p++ = (gpr_uint8)(id >> 16);
      53       35396 :   *p++ = (gpr_uint8)(id >> 8);
      54       35396 :   *p++ = (gpr_uint8)(id);
      55       35396 :   *p++ = (gpr_uint8)(window_update >> 24);
      56       35396 :   *p++ = (gpr_uint8)(window_update >> 16);
      57       35396 :   *p++ = (gpr_uint8)(window_update >> 8);
      58       35396 :   *p++ = (gpr_uint8)(window_update);
      59             : 
      60       35396 :   return slice;
      61             : }
      62             : 
      63       34802 : grpc_chttp2_parse_error grpc_chttp2_window_update_parser_begin_frame(
      64             :     grpc_chttp2_window_update_parser *parser, gpr_uint32 length,
      65             :     gpr_uint8 flags) {
      66       34802 :   if (flags || length != 4) {
      67           0 :     gpr_log(GPR_ERROR, "invalid window update: length=%d, flags=%02x", length,
      68             :             flags);
      69           0 :     return GRPC_CHTTP2_CONNECTION_ERROR;
      70             :   }
      71       34803 :   parser->byte = 0;
      72       34803 :   parser->amount = 0;
      73       34803 :   return GRPC_CHTTP2_PARSE_OK;
      74             : }
      75             : 
      76       35938 : grpc_chttp2_parse_error grpc_chttp2_window_update_parser_parse(
      77             :     grpc_exec_ctx *exec_ctx, void *parser,
      78             :     grpc_chttp2_transport_parsing *transport_parsing,
      79             :     grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) {
      80       35938 :   gpr_uint8 *const beg = GPR_SLICE_START_PTR(slice);
      81       35938 :   gpr_uint8 *const end = GPR_SLICE_END_PTR(slice);
      82       35829 :   gpr_uint8 *cur = beg;
      83       35829 :   grpc_chttp2_window_update_parser *p = parser;
      84             : 
      85      211051 :   while (p->byte != 4 && cur != end) {
      86      139175 :     p->amount |= ((gpr_uint32)*cur) << (8 * (3 - p->byte));
      87      139175 :     cur++;
      88      139175 :     p->byte++;
      89             :   }
      90             : 
      91       35938 :   if (p->byte == 4) {
      92       34800 :     gpr_uint32 received_update = p->amount;
      93       34800 :     if (received_update == 0 || (received_update & 0x80000000u)) {
      94           2 :       gpr_log(GPR_ERROR, "invalid window update bytes: %d", p->amount);
      95           0 :       return GRPC_CHTTP2_CONNECTION_ERROR;
      96             :     }
      97       34798 :     GPR_ASSERT(is_last);
      98             : 
      99       34798 :     if (transport_parsing->incoming_stream_id != 0) {
     100       28866 :       if (stream_parsing != NULL) {
     101       28846 :         GRPC_CHTTP2_FLOW_CREDIT_STREAM("parse", transport_parsing,
     102             :                                        stream_parsing, outgoing_window,
     103             :                                        received_update);
     104       28846 :         grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
     105             :                                                  stream_parsing);
     106             :       }
     107             :     } else {
     108        5932 :       GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parse", transport_parsing,
     109             :                                         outgoing_window, received_update);
     110             :     }
     111             :   }
     112             : 
     113       35826 :   return GRPC_CHTTP2_PARSE_OK;
     114             : }