1 /* 2 * Copyright 2021 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include "net_iface.h" 20 #include "net_sockio.h" 21 22 #include <sys/socket.h> 23 24 #include <cstddef> 25 #include <cstring> 26 27 namespace ncsi 28 { 29 30 class SockIO : public net::SockIO 31 { 32 public: 33 SockIO() = default; 34 35 explicit SockIO(int sockfd) : net::SockIO(sockfd) 36 {} 37 38 // This function creates a raw socket and initializes sockfd_. 39 // If the default constructor for this class was used, 40 // this function MUST be called before the object can be used 41 // for anything else. 42 int init(); 43 44 // Since raw packet socket is used for NC-SI, it needs to be bound 45 // to the interface. This function needs to be called after init, 46 // before the socket it used for communication. 47 int bind_to_iface(const net::IFaceBase& iface); 48 49 // Applies a filter to the interface to ignore VLAN tagged packets 50 int filter_vlans(); 51 52 // Non-blocking version of recv. Uses poll with timeout. 53 int recv(void* buf, size_t maxlen) override; 54 55 private: 56 struct sockaddr_ll sock_addr_; 57 const int kpoll_timeout_ = 10; 58 }; 59 60 } // namespace ncsi 61