1 /* 2 Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are 6 met: 7 * Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 * Redistributions in binary form must reproduce the above 10 copyright notice, this list of conditions and the following 11 disclaimer in the documentation and/or other materials provided 12 with the distribution. 13 * Neither the name of The Linux Foundation nor the names of its 14 contributors may be used to endorse or promote products derived 15 from this software without specific prior written permission. 16 17 THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 18 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 21 BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 24 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 26 OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 27 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 #ifndef IPACM_CONNTRACK_NATAPP_H 30 #define IPACM_CONNTRACK_NATAPP_H 31 32 #include <string.h> /* for stderror */ 33 #include <stdlib.h> 34 #include <cstdio> /* for perror */ 35 36 #include "IPACM_Config.h" 37 #include "IPACM_Xml.h" 38 39 extern "C" 40 { 41 #include <libnetfilter_conntrack/libnetfilter_conntrack.h> 42 #include <ipa_nat_drv.h> 43 } 44 45 #define MAX_TEMP_ENTRIES 25 46 47 #define IPACM_TCP_FULL_FILE_NAME "/proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established" 48 #define IPACM_UDP_FULL_FILE_NAME "/proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout_stream" 49 50 typedef struct _nat_table_entry 51 { 52 uint32_t private_ip; 53 uint16_t private_port; 54 55 uint32_t target_ip; 56 uint16_t target_port; 57 58 uint32_t public_ip; 59 uint16_t public_port; 60 61 u_int8_t protocol; 62 uint32_t timestamp; 63 64 bool dst_nat; 65 bool enabled; 66 uint32_t rule_hdl; 67 68 }nat_table_entry; 69 70 #define CHK_TBL_HDL() if(nat_table_hdl == 0){ return -1; } 71 72 class NatApp 73 { 74 private: 75 76 static NatApp *pInstance; 77 78 nat_table_entry *cache; 79 nat_table_entry temp[MAX_TEMP_ENTRIES]; 80 uint32_t pub_ip_addr; 81 uint32_t pub_ip_addr_pre; 82 uint32_t nat_table_hdl; 83 84 int curCnt, max_entries; 85 86 ipacm_alg *pALGPorts; 87 uint16_t nALGPort; 88 89 uint32_t tcp_timeout; 90 uint32_t udp_timeout; 91 92 uint32_t PwrSaveIfs[IPA_MAX_NUM_WIFI_CLIENTS]; 93 94 struct nf_conntrack *ct; 95 struct nfct_handle *ct_hdl; 96 97 NatApp(); 98 int Init(); 99 100 void UpdateCTUdpTs(nat_table_entry *, uint32_t); 101 bool ChkForDup(const nat_table_entry *); 102 bool isAlgPort(uint8_t, uint16_t); 103 void Reset(); 104 bool isPwrSaveIf(uint32_t); 105 106 public: 107 static NatApp* GetInstance(); 108 109 int AddTable(uint32_t); 110 uint32_t GetTableHdl(uint32_t); 111 int DeleteTable(uint32_t); 112 113 int AddEntry(const nat_table_entry *); 114 int DeleteEntry(const nat_table_entry *); 115 116 void UpdateUDPTimeStamp(); 117 118 int UpdatePwrSaveIf(uint32_t); 119 int ResetPwrSaveIf(uint32_t); 120 int DelEntriesOnClntDiscon(uint32_t); 121 int DelEntriesOnSTAClntDiscon(uint32_t); 122 123 void Read_TcpUdp_Timeout(void); 124 125 void AddTempEntry(const nat_table_entry *); 126 void CacheEntry(const nat_table_entry *); 127 void DeleteTempEntry(const nat_table_entry *); 128 void FlushTempEntries(uint32_t, bool, bool isDummy = false); 129 }; 130 131 132 133 #endif /* IPACM_CONNTRACK_NATAPP_H */ 134
