| // Copyright 2018 The gVisor 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. |
| |
| package stack |
| |
| import ( |
| "golang.org/x/time/rate" |
| ) |
| |
| const ( |
| // icmpLimit is the default maximum number of ICMP messages permitted by this |
| // rate limiter. |
| icmpLimit = 1000 |
| |
| // icmpBurst is the default number of ICMP messages that can be sent in a single |
| // burst. |
| icmpBurst = 50 |
| ) |
| |
| // ICMPRateLimiter is a global rate limiter that controls the generation of |
| // ICMP messages generated by the stack. |
| type ICMPRateLimiter struct { |
| *rate.Limiter |
| } |
| |
| // NewICMPRateLimiter returns a global rate limiter for controlling the rate |
| // at which ICMP messages are generated by the stack. |
| func NewICMPRateLimiter() *ICMPRateLimiter { |
| return &ICMPRateLimiter{Limiter: rate.NewLimiter(icmpLimit, icmpBurst)} |
| } |