| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * 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 "src/core/ext/transport/chttp2/transport/frame_settings.h" |
| #include "src/core/ext/transport/chttp2/transport/internal.h" |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/useful.h> |
| |
| #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h" |
| #include "src/core/ext/transport/chttp2/transport/frame.h" |
| #include "src/core/lib/debug/trace.h" |
| #include "src/core/lib/transport/http2_errors.h" |
| |
| static uint8_t *fill_header(uint8_t *out, uint32_t length, uint8_t flags) { |
| *out++ = (uint8_t)(length >> 16); |
| *out++ = (uint8_t)(length >> 8); |
| *out++ = (uint8_t)(length); |
| *out++ = GRPC_CHTTP2_FRAME_SETTINGS; |
| *out++ = flags; |
| *out++ = 0; |
| *out++ = 0; |
| *out++ = 0; |
| *out++ = 0; |
| return out; |
| } |
| |
| grpc_slice grpc_chttp2_settings_create(uint32_t *old_settings, |
| const uint32_t *new_settings, |
| uint32_t force_mask, size_t count) { |
| size_t i; |
| uint32_t n = 0; |
| grpc_slice output; |
| uint8_t *p; |
| |
| for (i = 0; i < count; i++) { |
| n += (new_settings[i] != old_settings[i] || (force_mask & (1u << i)) != 0); |
| } |
| |
| output = GRPC_SLICE_MALLOC(9 + 6 * n); |
| p = fill_header(GRPC_SLICE_START_PTR(output), 6 * n, 0); |
| |
| for (i = 0; i < count; i++) { |
| if (new_settings[i] != old_settings[i] || (force_mask & (1u << i)) != 0) { |
| *p++ = (uint8_t)(grpc_setting_id_to_wire_id[i] >> 8); |
| *p++ = (uint8_t)(grpc_setting_id_to_wire_id[i]); |
| *p++ = (uint8_t)(new_settings[i] >> 24); |
| *p++ = (uint8_t)(new_settings[i] >> 16); |
| *p++ = (uint8_t)(new_settings[i] >> 8); |
| *p++ = (uint8_t)(new_settings[i]); |
| old_settings[i] = new_settings[i]; |
| } |
| } |
| |
| GPR_ASSERT(p == GRPC_SLICE_END_PTR(output)); |
| |
| return output; |
| } |
| |
| grpc_slice grpc_chttp2_settings_ack_create(void) { |
| grpc_slice output = GRPC_SLICE_MALLOC(9); |
| fill_header(GRPC_SLICE_START_PTR(output), 0, GRPC_CHTTP2_FLAG_ACK); |
| return output; |
| } |
| |
| grpc_error *grpc_chttp2_settings_parser_begin_frame( |
| grpc_chttp2_settings_parser *parser, uint32_t length, uint8_t flags, |
| uint32_t *settings) { |
| parser->target_settings = settings; |
| memcpy(parser->incoming_settings, settings, |
| GRPC_CHTTP2_NUM_SETTINGS * sizeof(uint32_t)); |
| parser->is_ack = 0; |
| parser->state = GRPC_CHTTP2_SPS_ID0; |
| if (flags == GRPC_CHTTP2_FLAG_ACK) { |
| parser->is_ack = 1; |
| if (length != 0) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "non-empty settings ack frame received"); |
| } |
| return GRPC_ERROR_NONE; |
| } else if (flags != 0) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "invalid flags on settings frame"); |
| } else if (length % 6 != 0) { |
| return GRPC_ERROR_CREATE_FROM_STATIC_STRING( |
| "settings frames must be a multiple of six bytes"); |
| } else { |
| return GRPC_ERROR_NONE; |
| } |
| } |
| |
| grpc_error *grpc_chttp2_settings_parser_parse(grpc_exec_ctx *exec_ctx, void *p, |
| grpc_chttp2_transport *t, |
| grpc_chttp2_stream *s, |
| grpc_slice slice, int is_last) { |
| grpc_chttp2_settings_parser *parser = (grpc_chttp2_settings_parser *)p; |
| const uint8_t *cur = GRPC_SLICE_START_PTR(slice); |
| const uint8_t *end = GRPC_SLICE_END_PTR(slice); |
| char *msg; |
| grpc_chttp2_setting_id id; |
| |
| if (parser->is_ack) { |
| return GRPC_ERROR_NONE; |
| } |
| |
| for (;;) { |
| switch (parser->state) { |
| case GRPC_CHTTP2_SPS_ID0: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_ID0; |
| if (is_last) { |
| memcpy(parser->target_settings, parser->incoming_settings, |
| GRPC_CHTTP2_NUM_SETTINGS * sizeof(uint32_t)); |
| grpc_slice_buffer_add(&t->qbuf, grpc_chttp2_settings_ack_create()); |
| } |
| return GRPC_ERROR_NONE; |
| } |
| parser->id = (uint16_t)(((uint16_t)*cur) << 8); |
| cur++; |
| /* fallthrough */ |
| case GRPC_CHTTP2_SPS_ID1: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_ID1; |
| return GRPC_ERROR_NONE; |
| } |
| parser->id = (uint16_t)(parser->id | (*cur)); |
| cur++; |
| /* fallthrough */ |
| case GRPC_CHTTP2_SPS_VAL0: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_VAL0; |
| return GRPC_ERROR_NONE; |
| } |
| parser->value = ((uint32_t)*cur) << 24; |
| cur++; |
| /* fallthrough */ |
| case GRPC_CHTTP2_SPS_VAL1: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_VAL1; |
| return GRPC_ERROR_NONE; |
| } |
| parser->value |= ((uint32_t)*cur) << 16; |
| cur++; |
| /* fallthrough */ |
| case GRPC_CHTTP2_SPS_VAL2: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_VAL2; |
| return GRPC_ERROR_NONE; |
| } |
| parser->value |= ((uint32_t)*cur) << 8; |
| cur++; |
| /* fallthrough */ |
| case GRPC_CHTTP2_SPS_VAL3: |
| if (cur == end) { |
| parser->state = GRPC_CHTTP2_SPS_VAL3; |
| return GRPC_ERROR_NONE; |
| } else { |
| parser->state = GRPC_CHTTP2_SPS_ID0; |
| } |
| parser->value |= *cur; |
| cur++; |
| |
| if (grpc_wire_id_to_setting_id(parser->id, &id)) { |
| const grpc_chttp2_setting_parameters *sp = |
| &grpc_chttp2_settings_parameters[id]; |
| if (parser->value < sp->min_value || parser->value > sp->max_value) { |
| switch (sp->invalid_value_behavior) { |
| case GRPC_CHTTP2_CLAMP_INVALID_VALUE: |
| parser->value = |
| GPR_CLAMP(parser->value, sp->min_value, sp->max_value); |
| break; |
| case GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE: |
| grpc_chttp2_goaway_append( |
| t->last_new_stream_id, sp->error_value, |
| grpc_slice_from_static_string("HTTP2 settings error"), |
| &t->qbuf); |
| gpr_asprintf(&msg, "invalid value %u passed for %s", |
| parser->value, sp->name); |
| grpc_error *err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg); |
| gpr_free(msg); |
| return err; |
| } |
| } |
| if (id == GRPC_CHTTP2_SETTINGS_INITIAL_WINDOW_SIZE && |
| parser->incoming_settings[id] != parser->value) { |
| t->flow_control.initial_window_update += |
| (int64_t)parser->value - parser->incoming_settings[id]; |
| if (GRPC_TRACER_ON(grpc_http_trace) || |
| GRPC_TRACER_ON(grpc_flowctl_trace)) { |
| gpr_log(GPR_DEBUG, "%p[%s] adding %d for initial_window change", |
| t, t->is_client ? "cli" : "svr", |
| (int)t->flow_control.initial_window_update); |
| } |
| } |
| parser->incoming_settings[id] = parser->value; |
| if (GRPC_TRACER_ON(grpc_http_trace)) { |
| gpr_log(GPR_DEBUG, "CHTTP2:%s:%s: got setting %s = %d", |
| t->is_client ? "CLI" : "SVR", t->peer_string, sp->name, |
| parser->value); |
| } |
| } else if (GRPC_TRACER_ON(grpc_http_trace)) { |
| gpr_log(GPR_ERROR, "CHTTP2: Ignoring unknown setting %d (value %d)", |
| parser->id, parser->value); |
| } |
| break; |
| } |
| } |
| } |