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1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include <bluetooth/logger.h> |
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17 #include "pannapiphook.h" |
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18 #include "RBnepFrame.h" // For the DHCP / Forwarding RMBufPacket header flags |
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19 |
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20 #include <in_sock.h> |
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21 #include <in_chk.h> |
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22 #include <udp_hdr.h> |
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23 #include <es_prot_internal.h> |
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24 |
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25 _LIT(KProtocolPanNapIpHookName, "pannapiphook"); |
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26 |
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27 #ifdef __FLOG_ACTIVE |
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28 _LIT8(KLogComponent, LOG_COMPONENT_PAN_NAPIPHOOK); |
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29 #endif |
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30 |
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31 #ifdef __FLOG_ACTIVE |
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32 // Define strings for logging. |
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33 _LIT(KStringTrue, "True"); |
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34 _LIT(KStringFalse, "False"); |
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35 _LIT(KStringDropped, "Dropped"); |
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36 _LIT(KStringPassed, "Passed"); |
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37 #endif |
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38 |
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39 |
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40 static const TUint KDhcpDstPort = 67; |
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41 |
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42 // Returning a negative number from the ApplyL() method in an IP hook will make the IP |
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43 // stack drop the packet. No constant is defined in networking so define it here to |
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44 // help readability of the code. |
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45 static const TInt KIp6Hook_DROP = -1; |
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46 |
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47 // |
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48 // CPanNapIpHook |
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49 // |
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50 CPanNapIpHook* CPanNapIpHook::NewL() |
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51 { |
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52 CPanNapIpHook* self = new(ELeave) CPanNapIpHook(); |
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53 return self; |
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54 } |
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55 |
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56 CPanNapIpHook::~CPanNapIpHook() |
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57 { |
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58 Unbind(this,BindHookAll()); |
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59 CProtocolPosthook::NetworkDetached(); |
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60 } |
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61 |
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62 void CPanNapIpHook::NetworkAttachedL() |
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63 { |
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64 // This hook is dual purpose and checks both that incoming packets destined for the |
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65 // DHCP server and any packets to be forwarded to the uplink have access to do so. |
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66 // This is why the hook gets bound in 2 places, once for forwarding packets and once |
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67 // for all incoming packets. The logic in ApplyL() determines where the hook has |
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68 // been called from. |
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69 NetworkService()->BindL(this, BindForwardHook()); |
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70 NetworkService()->BindL(this, BindHookAll()); |
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71 iManager = NetworkService()->Interfacer(); |
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72 } |
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73 |
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74 TInt CPanNapIpHook::ApplyL(RMBufHookPacket &aPacket, RMBufRecvInfo &aInfo) |
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75 { |
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76 TInt rCode = KIp6Hook_PASS; |
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77 |
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78 // This hook is for packets coming from BNEP only and performs two purposes depending |
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79 // on whether or not the packet is destined for the local host or not. |
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80 if(aInfo.iFlags & KBnep) |
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81 { |
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82 LOG1(_L("Remote device granted access to uplink: %S"), (aInfo.iFlags & KBnepForwardingAllowed) ? &KStringTrue() : &KStringFalse()); |
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83 |
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84 if (iManager->IsForMeAddress(TInetAddr::Cast(aInfo.iDstAddr).Ip6Address(), aInfo.iInterfaceIndex)) |
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85 { |
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86 LOG(_L("Packet destined for local host")); |
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87 |
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88 // Make sure that any packets from BNEP destined for the DHCP Server are processed |
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89 // only if it has come from a remote device granted access to the uplink |
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90 if(aInfo.iProtocol == KProtocolInetUdp) |
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91 { |
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92 TInet6Checksum<TInet6HeaderIP4> ipHeader(aPacket); |
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93 TInet6Packet<TInet6HeaderUDP> udpHeader(aPacket, ipHeader.iHdr->HeaderLength()); |
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94 |
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95 if(udpHeader.iHdr->DstPort() == KDhcpDstPort) |
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96 { |
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97 LOG(_L("DHCP packet detected")); |
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98 |
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99 // DHCP packet. Drop if forwarding flag not set. |
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100 if(!(aInfo.iFlags & KBnepForwardingAllowed)) |
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101 { |
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102 aPacket.Free(); |
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103 rCode = KIp6Hook_DROP; // Drop packet |
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104 } |
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105 } |
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106 } |
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107 } |
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108 else |
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109 { |
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110 LOG(_L("Packet destined to be forwarded")); |
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111 |
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112 // Before forwarding packets from BNEP ensure that they have come from a remote |
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113 // device granted access to the uplink |
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114 if(!(aInfo.iFlags & KBnepForwardingAllowed)) |
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115 { |
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116 aPacket.Free(); |
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117 rCode = KIp6Hook_DROP; // Drop packet |
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118 } |
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119 } |
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120 } |
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121 |
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122 // Finished with the flags |
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123 aInfo.iFlags &= ~KBnep; |
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124 aInfo.iFlags &= ~KBnepForwardingAllowed; |
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125 |
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126 LOG1(_L("Packet %S"), (rCode < 0) ? &KStringDropped() : &KStringPassed()); |
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127 |
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128 return rCode; |
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129 } |
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130 |
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131 void CPanNapIpHook::Identify(TServerProtocolDesc* aProtocolDesc) const |
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132 { |
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133 Describe(*aProtocolDesc); |
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134 } |
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135 |
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136 void CPanNapIpHook::Describe(TServerProtocolDesc& aEntry) |
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137 { |
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138 aEntry.iName = KProtocolPanNapIpHookName; |
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139 aEntry.iAddrFamily = KAfInet; |
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140 aEntry.iSockType = KSockDatagram; |
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141 aEntry.iProtocol = KProtocolPanNapIpHook; |
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142 aEntry.iVersion = TVersion(1, 0, 0); |
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143 aEntry.iByteOrder = EBigEndian; |
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144 aEntry.iServiceInfo = KSIDatagram | KSIConnectionLess; |
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145 aEntry.iNamingServices = 0; |
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146 aEntry.iSecurity = KSocketNoSecurity; |
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147 aEntry.iMessageSize = 0xffff; |
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148 aEntry.iServiceTypeInfo = 0; |
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149 aEntry.iNumSockets = KUnlimitedSockets; |
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150 aEntry.iServiceTypeInfo = ESocketSupport | EInterface; |
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151 } |
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152 |
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153 // |
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154 // CPanNapIpHookFamily |
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155 // |
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156 CPanNapIpHookFamily::CPanNapIpHookFamily() |
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157 { |
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158 __DECLARE_NAME(_S("CPanNapIpHookFamily")); |
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159 } |
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160 |
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161 CPanNapIpHookFamily::~CPanNapIpHookFamily() |
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162 { |
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163 } |
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164 |
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165 TInt CPanNapIpHookFamily::Install() |
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166 { |
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167 return KErrNone; |
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168 } |
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169 |
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170 TInt CPanNapIpHookFamily::Remove() |
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171 { |
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172 return KErrNone; |
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173 } |
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174 |
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175 TUint CPanNapIpHookFamily::ProtocolList(TServerProtocolDesc *& aProtocolList) |
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176 { |
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177 aProtocolList = new TServerProtocolDesc[1]; |
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178 |
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179 if (!aProtocolList) |
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180 { |
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181 return 0; |
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182 } |
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183 |
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184 CPanNapIpHook::Describe(aProtocolList[0]); |
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185 return 1; |
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186 } |
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187 |
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188 CProtocolBase* CPanNapIpHookFamily::NewProtocolL(TUint /*aSockType*/, TUint aProtocol) |
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189 { |
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190 if (aProtocol != KProtocolPanNapIpHook) |
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191 { |
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192 User::Leave(KErrNotSupported); |
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193 } |
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194 return CPanNapIpHook::NewL(); |
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195 } |
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196 |
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197 EXPORT_C CProtocolFamilyBase* Install(void) |
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198 { |
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199 CPanNapIpHookFamily* protocol = new CPanNapIpHookFamily(); |
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200 return protocol; |
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201 } |