1 /** @file 2 3 Copyright (c) 2005 - 2014, Intel Corporation. All rights reserved.<BR> 4 This program and the accompanying materials 5 are licensed and made available under the terms and conditions of the BSD License 6 which accompanies this distribution. The full text of the license may be found at 7 http://opensource.org/licenses/bsd-license.php 8 9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 12 **/ 13 14 #include "Ip4Impl.h" 15 16 17 /** 18 Return the cast type (Unicast/Boradcast) specific to an 19 interface. All the addresses are host byte ordered. 20 21 @param[in] IpAddr The IP address to classify in host byte order 22 @param[in] IpIf The interface that IpAddr received from 23 24 @return The cast type of this IP address specific to the interface. 25 @retval IP4_LOCAL_HOST The IpAddr equals to the interface's address 26 @retval IP4_SUBNET_BROADCAST The IpAddr is a directed subnet boradcast to the 27 interface 28 @retval IP4_NET_BROADCAST The IpAddr is a network broadcast to the interface 29 @retval 0 Otherwise. 30 31 **/ 32 INTN 33 Ip4GetNetCast ( 34 IN IP4_ADDR IpAddr, 35 IN IP4_INTERFACE *IpIf 36 ) 37 { 38 if (IpAddr == IpIf->Ip) { 39 return IP4_LOCAL_HOST; 40 41 } else if (IpAddr == IpIf->SubnetBrdcast) { 42 return IP4_SUBNET_BROADCAST; 43 44 } else if (IpAddr == IpIf->NetBrdcast) { 45 return IP4_NET_BROADCAST; 46 47 } 48 49 return 0; 50 } 51 52 53 /** 54 Find the cast type of the packet related to the local host. 55 This isn't the same as link layer cast type. For example, DHCP 56 server may send local broadcast to the local unicast MAC. 57 58 @param[in] IpSb The IP4 service binding instance that received the 59 packet 60 @param[in] Dst The destination address in the packet (host byte 61 order) 62 @param[in] Src The source address in the packet (host byte order) 63 64 @return The cast type for the Dst, it will return on the first non-promiscuous 65 cast type to a configured interface. If the packet doesn't match any of 66 the interface, multicast address and local broadcast address are checked. 67 68 **/ 69 INTN 70 Ip4GetHostCast ( 71 IN IP4_SERVICE *IpSb, 72 IN IP4_ADDR Dst, 73 IN IP4_ADDR Src 74 ) 75 { 76 LIST_ENTRY *Entry; 77 IP4_INTERFACE *IpIf; 78 INTN Type; 79 INTN Class; 80 81 Type = 0; 82 83 if (IpSb->MnpConfigData.EnablePromiscuousReceive) { 84 Type = IP4_PROMISCUOUS; 85 } 86 87 // 88 // Go through the interface list of the IP service, most likely. 89 // 90 NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) { 91 IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link); 92 93 // 94 // Skip the unconfigured interface and invalid source address: 95 // source address can't be broadcast. 96 // 97 if (!IpIf->Configured || IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) { 98 continue; 99 } 100 101 if ((Class = Ip4GetNetCast (Dst, IpIf)) > Type) { 102 return Class; 103 } 104 } 105 106 // 107 // If it is local broadcast address. The source address must 108 // be a unicast address on one of the direct connected network. 109 // If it is a multicast address, accept it only if we are in 110 // the group. 111 // 112 if (Dst == IP4_ALLONE_ADDRESS) { 113 IpIf = Ip4FindNet (IpSb, Src); 114 115 if (IpIf != NULL && !IP4_IS_BROADCAST (Ip4GetNetCast (Src, IpIf))) { 116 return IP4_LOCAL_BROADCAST; 117 } 118 119 } else if (IP4_IS_MULTICAST (Dst) && Ip4FindGroup (&IpSb->IgmpCtrl, Dst) != NULL) { 120 return IP4_MULTICAST; 121 } 122 123 return Type; 124 } 125 126 127 /** 128 Find an interface whose configured IP address is Ip. 129 130 @param[in] IpSb The IP4 service binding instance 131 @param[in] Ip The Ip address (host byte order) to find 132 133 @return The IP4_INTERFACE point if found, otherwise NULL 134 135 **/ 136 IP4_INTERFACE * 137 Ip4FindInterface ( 138 IN IP4_SERVICE *IpSb, 139 IN IP4_ADDR Ip 140 ) 141 { 142 LIST_ENTRY *Entry; 143 IP4_INTERFACE *IpIf; 144 145 NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) { 146 IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link); 147 148 if (IpIf->Configured && (IpIf->Ip == Ip)) { 149 return IpIf; 150 } 151 } 152 153 return NULL; 154 } 155 156 157 /** 158 Find an interface that Ip is on that connected network. 159 160 @param[in] IpSb The IP4 service binding instance 161 @param[in] Ip The Ip address (host byte order) to find 162 163 @return The IP4_INTERFACE point if found, otherwise NULL 164 165 **/ 166 IP4_INTERFACE * 167 Ip4FindNet ( 168 IN IP4_SERVICE *IpSb, 169 IN IP4_ADDR Ip 170 ) 171 { 172 LIST_ENTRY *Entry; 173 IP4_INTERFACE *IpIf; 174 175 NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) { 176 IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link); 177 178 if (IpIf->Configured && IP4_NET_EQUAL (Ip, IpIf->Ip, IpIf->SubnetMask)) { 179 return IpIf; 180 } 181 } 182 183 return NULL; 184 } 185 186 187 /** 188 Find an interface of the service with the same Ip/Netmask pair. 189 190 @param[in] IpSb Ip4 service binding instance 191 @param[in] Ip The Ip adress to find (host byte order) 192 @param[in] Netmask The network to find (host byte order) 193 194 @return The IP4_INTERFACE point if found, otherwise NULL 195 196 **/ 197 IP4_INTERFACE * 198 Ip4FindStationAddress ( 199 IN IP4_SERVICE *IpSb, 200 IN IP4_ADDR Ip, 201 IN IP4_ADDR Netmask 202 ) 203 { 204 LIST_ENTRY *Entry; 205 IP4_INTERFACE *IpIf; 206 207 NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) { 208 IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link); 209 210 if (IpIf->Configured && (IpIf->Ip == Ip) && (IpIf->SubnetMask == Netmask)) { 211 return IpIf; 212 } 213 } 214 215 return NULL; 216 } 217 218 219 /** 220 Get the MAC address for a multicast IP address. Call 221 Mnp's McastIpToMac to find the MAC address in stead of 222 hard code the NIC to be Ethernet. 223 224 @param[in] Mnp The Mnp instance to get the MAC address. 225 @param[in] Multicast The multicast IP address to translate. 226 @param[out] Mac The buffer to hold the translated address. 227 228 @retval EFI_SUCCESS if the multicast IP is successfully translated to a 229 multicast MAC address. 230 @retval other Otherwise some error. 231 232 **/ 233 EFI_STATUS 234 Ip4GetMulticastMac ( 235 IN EFI_MANAGED_NETWORK_PROTOCOL *Mnp, 236 IN IP4_ADDR Multicast, 237 OUT EFI_MAC_ADDRESS *Mac 238 ) 239 { 240 EFI_IP_ADDRESS EfiIp; 241 242 EFI_IP4 (EfiIp.v4) = HTONL (Multicast); 243 return Mnp->McastIpToMac (Mnp, FALSE, &EfiIp, Mac); 244 } 245 246 247 /** 248 Convert the multibyte field in IP header's byter order. 249 In spite of its name, it can also be used to convert from 250 host to network byte order. 251 252 @param[in] Head The IP head to convert 253 254 @return Point to the converted IP head 255 256 **/ 257 IP4_HEAD * 258 Ip4NtohHead ( 259 IN IP4_HEAD *Head 260 ) 261 { 262 Head->TotalLen = NTOHS (Head->TotalLen); 263 Head->Id = NTOHS (Head->Id); 264 Head->Fragment = NTOHS (Head->Fragment); 265 Head->Src = NTOHL (Head->Src); 266 Head->Dst = NTOHL (Head->Dst); 267 268 return Head; 269 } 270
