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< pre style = " font-family:monospace;font-size:12pt " >
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< a name = " l1 " > < / a > < span class = cF0 > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IPV4_ERR_ADDR_INVALID - < / span > < span class = cFE > 200001 < / span > < span class = cF0 >
< a name = " l2 " > < / a > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IPV4_ERR_HOST_UNREACHABLE - < / span > < span class = cFE > 200002 < / span > < span class = cF0 >
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< a name = " l3 " > < / a >
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< a name = " l4 " > < / a > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IPV4_TTL < / span > < span class = cFE > 64 < / span > < span class = cF0 >
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< a name = " l5 " > < / a >
< a name = " l6 " > < / a > < / span > < span class = cF2 > //Look up IP Protocol Numbers online to see many more.</span><span class=cF0>
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< a name = " l7 " > < / a > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IP_PROTOCOL_ICMP < / span > < span class = cFE > 0x01 < / span > < span class = cF0 >
< a name = " l8 " > < / a > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IP_PROTOCOL_TCP < / span > < span class = cFE > 0x06 < / span > < span class = cF0 >
< a name = " l9 " > < / a > # < / span > < span class = cF1 > define < / span > < span class = cF0 > IP_PROTOCOL_UDP < / span > < span class = cFE > 0x11 < / span > < span class = cF0 >
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< a name = " l10 " > < / a >
< a name = " l11 " > < / a > < / span > < span class = cF1 > class < / span > < span class = cF0 > CIPV4Packet
< a name = " l12 " > < / a > {
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< a name = " l13 " > < / a > CEthernetFrame * ethernet_frame ;
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< a name = " l14 " > < / a >
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< a name = " l15 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > source_ip_address ;
< a name = " l16 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > destination_ip_address ;
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< a name = " l17 " > < / a >
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< a name = " l18 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > protocol ;
< a name = " l19 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > padding [ < / span > < span class = cFE > 7 < / span > < span class = cF0 > ] ;
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< a name = " l20 " > < / a >
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< a name = " l21 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * data ;
< a name = " l22 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > length ;
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< a name = " l23 " > < / a > } ;
< a name = " l24 " > < / a >
< a name = " l25 " > < / a > < / span > < span class = cF1 > class < / span > < span class = cF0 > CIPV4Header
< a name = " l26 " > < / a > { < / span > < span class = cF2 > // note: U4's in some U8s.</span><span class=cF0>
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< a name = " l27 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > version_ihl ; < / span > < span class = cF2 > // Version for IPV4 is 4. IHL=Internet Header Length</span><span class=cF0>
< a name = " l28 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > dscp_ecn ; < / span > < span class = cF2 > // DSCP=Differentiated Services Code Point. ECN=Explicit Congestion Notification</span><span class=cF0>
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< a name = " l29 " > < / a >
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< a name = " l30 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > total_length ; < / span > < span class = cF2 > // min 20B max 65535</span><span class=cF0>
< a name = " l31 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > identification ;
< a name = " l32 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > flags_fragment_offset ; < / span > < span class = cF2 > // flags first(?) 3 bits. fragment offset min 0 max 65528</span><span class=cF0>
< a name = " l33 " > < / a > < / span > < span class = cF2 > // flag: bit 0: reserved must be 0. bit 1: don't fragment. bit 2: more fragments</span><span class=cF0>
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< a name = " l34 " > < / a >
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< a name = " l35 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > time_to_live ; < / span > < span class = cF2 > // specified in seconds, wikipedia says nowadays serves as a hop count</span><span class=cF0>
< a name = " l36 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > protocol ;
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< a name = " l37 " > < / a >
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< a name = " l38 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > header_checksum ;
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< a name = " l39 " > < / a >
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< a name = " l40 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > source_ip_address ;
< a name = " l41 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > destination_ip_address ;
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< a name = " l42 " > < / a > } ;
< a name = " l43 " > < / a >
< a name = " l44 " > < / a > < / span > < span class = cF1 > class < / span > < span class = cF0 > CIPV4Globals
< a name = " l45 " > < / a > { < / span > < span class = cF2 > // _be indicates Big Endian</span><span class=cF0>
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< a name = " l46 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > local_ip ;
< a name = " l47 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > local_ip_be ;
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< a name = " l48 " > < / a >
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< a name = " l49 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > ipv4_router_address ;
< a name = " l50 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > ipv4_subnet_mask ;
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< a name = " l51 " > < / a >
< a name = " l52 " > < / a > } ipv4_globals ;
< a name = " l53 " > < / a >
< a name = " l54 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4GlobalsInit ( )
< a name = " l55 " > < / a > {
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< a name = " l56 " > < / a > ipv4_globals . local_ip = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l57 " > < / a > ipv4_globals . local_ip_be = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l58 " > < / a > ipv4_globals . ipv4_router_address = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l59 " > < / a > ipv4_globals . ipv4_subnet_mask = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
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< a name = " l60 " > < / a > } ;
< a name = " l61 " > < / a >
< a name = " l62 " > < / a > < / span > < span class = cF2 > // For now, trusting Shrine's implement</span><span class=cF0>
< a name = " l63 " > < / a > < / span > < span class = cF2 > // of checksum. Shrine links back to</span><span class=cF0>
< a name = " l64 " > < / a > < / span > < span class = cF2 > // http://stackoverflow.com/q/26774761/2524350</span><span class=cF0>
< a name = " l65 " > < / a >
< a name = " l66 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > IPV4Checksum ( < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * header , < / span > < span class = cF9 > I64 < / span > < span class = cF0 > length )
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< a name = " l67 " > < / a > { < / span > < span class = cF2 > //todo. make names clearer, and better comments.</span><span class=cF0>
< a name = " l68 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > nleft = length ;
< a name = " l69 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > * w = header ;
< a name = " l70 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > sum = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
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< a name = " l71 " > < / a >
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< a name = " l72 " > < / a > < / span > < span class = cF1 > while < / span > < span class = cF0 > ( nleft & gt ; < / span > < span class = cFE > 1 < / span > < span class = cF0 > )
< a name = " l73 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l74 " > < / a > sum + = * w + + ;
< a name = " l75 " > < / a > nleft - = < / span > < span class = cFE > 2 < / span > < span class = cF0 > ;
< a name = " l76 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l77 " > < / a >
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< a name = " l78 " > < / a > < / span > < span class = cF2 > // "mop up an odd byte, if necessary"</span><span class=cF0>
< a name = " l79 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( nleft = = < / span > < span class = cFE > 1 < / span > < span class = cF0 > )
< a name = " l80 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l81 " > < / a > sum + = * w & amp ; < / span > < span class = cFE > 0x00FF < / span > < span class = cF0 > ;
< a name = " l82 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l83 " > < / a >
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< a name = " l84 " > < / a > < / span > < span class = cF2 > // "add back carry outs from top 16 bits to low 16 bits"</span><span class=cF0>
< a name = " l85 " > < / a > sum = sum & gt ; & gt ; < / span > < span class = cFE > 16 < / span > < span class = cF0 > + sum & amp ; < / span > < span class = cFE > 0xFFFF < / span > < span class = cF0 > ; < / span > < span class = cF2 > // "add hi 16 to low 16"</span><span class=cF0>
< a name = " l86 " > < / a > sum + = sum & gt ; & gt ; < / span > < span class = cFE > 16 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // add carry</span><span class=cF0>
< a name = " l87 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > ~ sum & amp ; < / span > < span class = cFE > 0xFFFF < / span > < span class = cF0 > ;
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< a name = " l88 " > < / a >
< a name = " l89 " > < / a > }
< a name = " l90 " > < / a >
< a name = " l91 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > IPV4AddressMACGet ( < / span > < span class = cF9 > U32 < / span > < span class = cF0 > ip_address , < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * * mac_out )
< a name = " l92 " > < / a > {
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< a name = " l93 " > < / a > CARPHash * entry ;
< a name = " l94 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > retries ;
< a name = " l95 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > attempt ;
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< a name = " l96 " > < / a >
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< a name = " l97 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( ip_address = = < / span > < span class = cFE > 0 < / span > < span class = cF0 > )
< a name = " l98 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l99 " > < / a > NetErr ( < / span > < span class = cF6 > & quot ; GET MAC FOR IP : Failed . Address = 0 & quot ; < / span > < span class = cF0 > ) ;
< a name = " l100 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > IPV4_ERR_ADDR_INVALID ;
< a name = " l101 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
< a name = " l102 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( ip_address = = < / span > < span class = cFE > 0xFFFFFFFF < / span > < span class = cF0 > )
< a name = " l103 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l104 " > < / a > NetLog ( < / span > < span class = cF6 > & quot ; GET MAC FOR IP : Returning ethernet broadcast & quot ; < / span > < span class = cF0 > ) ;
< a name = " l105 " > < / a > * mac_out = ethernet_globals . ethernet_broadcast ;
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< a name = " l106 " > < / a >
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< a name = " l107 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l108 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l109 " > < / a >
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< a name = " l110 " > < / a > < / span > < span class = cF2 > // "outside this subnet; needs routing"</span><span class=cF0>
< a name = " l111 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( ip_address & amp ; ipv4_globals . ipv4_subnet_mask ! = ipv4_globals . local_ip & amp ; ipv4_globals . ipv4_subnet_mask )
< a name = " l112 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l113 " > < / a > NetWarn ( < / span > < span class = cF6 > & quot ; GET MAC FOR IP : TODO : Doing IPV4AddressMACGet recursion , could infinite loop and overflow stack . & quot ; < / span > < span class = cF0 > ) ;
< a name = " l114 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > IPV4AddressMACGet ( ipv4_globals . ipv4_router_address , mac_out ) ;
< a name = " l115 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
< a name = " l116 " > < / a > < / span > < span class = cF1 > else < / span > < span class = cF0 > < / span > < span class = cF2 > // "local network"</span><span class=cF0>
< a name = " l117 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l118 " > < / a > NetLog ( < / span > < span class = cF6 > & quot ; GET MAC FOR IP : Attempting ARP Find by IP for address : % 0 X . & quot ; < / span > < span class = cF0 > , ip_address ) ;
< a name = " l119 " > < / a > entry = ARPCacheFind ( ip_address ) ;
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< a name = " l120 " > < / a >
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< a name = " l121 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( entry )
< a name = " l122 " > < / a > {
< a name = " l123 " > < / a > * mac_out = entry - & gt ; mac_address ;
< a name = " l124 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l125 " > < / a > }
< a name = " l126 " > < / a > < / span > < span class = cF2 > //else, not in cache, need to request it</span><span class=cF0>
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< a name = " l127 " > < / a >
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< a name = " l128 " > < / a > < / span > < span class = cF2 > // "Up to 4 retries, 500 ms each"</span><span class=cF0>
< a name = " l129 " > < / a > retries = < / span > < span class = cFE > 4 < / span > < span class = cF0 > ;
< a name = " l130 " > < / a > < / span > < span class = cF1 > while < / span > < span class = cF0 > ( retries )
< a name = " l131 " > < / a > {
< a name = " l132 " > < / a > ARPSend ( ARP_REQUEST ,
< a name = " l133 " > < / a > ethernet_globals . ethernet_broadcast ,
< a name = " l134 " > < / a > EthernetMACGet ,
< a name = " l135 " > < / a > ipv4_globals . local_ip_be ,
< a name = " l136 " > < / a > ethernet_globals . ethernet_null ,
< a name = " l137 " > < / a > < / span > < span class = cF5 > EndianU32 < / span > < span class = cF7 > ( < / span > < span class = cF0 > ip_address < / span > < span class = cF7 > ) < / span > < span class = cF0 > ) ;
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< a name = " l138 " > < / a >
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< a name = " l139 " > < / a > attempt = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l140 " > < / a > < / span > < span class = cF1 > for < / span > < span class = cF0 > ( attempt = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; attempt & lt ; < / span > < span class = cFE > 50 < / span > < span class = cF0 > ; attempt + + )
< a name = " l141 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l142 " > < / a > < / span > < span class = cF5 > Sleep < / span > < span class = cF0 > ( < / span > < span class = cFE > 10 < / span > < span class = cF0 > ) ;
< a name = " l143 " > < / a > entry = ARPCacheFind ( ip_address ) ;
< a name = " l144 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( entry )
< a name = " l145 " > < / a > < / span > < span class = cF1 > break < / span > < span class = cF0 > ;
< a name = " l146 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l147 " > < / a >
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< a name = " l148 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( entry )
< a name = " l149 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l150 " > < / a > * mac_out = entry - & gt ; mac_address ;
< a name = " l151 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > < / span > < span class = cFE > 0 < / span > < span class = cF0 > ;
< a name = " l152 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l153 " > < / a >
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< a name = " l154 " > < / a > retries - - ;
< a name = " l155 " > < / a > }
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< a name = " l156 " > < / a >
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< a name = " l157 " > < / a > < / span > < span class = cF2 > //Shrine does some in_addr mess to log error</span><span class=cF0>
< a name = " l158 " > < / a > NetErr ( < / span > < span class = cF6 > & quot ; GET MAC FOR IP : Failed to resolve address % d & quot ; < / span > < span class = cF0 > , ip_address ) ;
< a name = " l159 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > IPV4_ERR_HOST_UNREACHABLE ;
< a name = " l160 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l161 " > < / a > }
< a name = " l162 " > < / a >
< a name = " l163 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > IPV4PacketAllocate ( < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * * frame_out ,
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< a name = " l164 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > protocol ,
< a name = " l165 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > source_ip_address ,
< a name = " l166 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > destination_ip_address ,
< a name = " l167 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > length )
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< a name = " l168 " > < / a > {
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< a name = " l169 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * ipv4_frame ;
< a name = " l170 " > < / a > < / span > < span class = cF1 > U8 < / span > < span class = cF0 > * destination_mac_address ;
< a name = " l171 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > error ;
< a name = " l172 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > de_index ;
< a name = " l173 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > internet_header_length ;
< a name = " l174 " > < / a > CIPV4Header * header ;
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< a name = " l175 " > < / a >
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< a name = " l176 " > < / a > error = IPV4AddressMACGet ( destination_ip_address , & amp ; destination_mac_address ) ;
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< a name = " l177 " > < / a >
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< a name = " l178 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( error & lt ; < / span > < span class = cFE > 0 < / span > < span class = cF0 > )
< a name = " l179 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l180 " > < / a > NetLog ( < / span > < span class = cF6 > & quot ; IPV4 PACKET ALLOCATE : Failed to get MAC for destination . & quot ; < / span > < span class = cF0 > ) ;
< a name = " l181 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > error ;
< a name = " l182 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l183 " > < / a >
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< a name = " l184 " > < / a > de_index = EthernetFrameAllocate ( & amp ; ipv4_frame ,
< a name = " l185 " > < / a > EthernetMACGet ,
< a name = " l186 " > < / a > destination_mac_address ,
< a name = " l187 " > < / a > ETHERTYPE_IPV4 ,
< a name = " l188 " > < / a > < / span > < span class = cF1 > sizeof < / span > < span class = cF7 > ( < / span > < span class = cF0 > CIPV4Header < / span > < span class = cF7 > ) < / span > < span class = cF0 > + length ) ;
< a name = " l189 " > < / a > < / span > < span class = cF1 > if < / span > < span class = cF0 > ( de_index & lt ; < / span > < span class = cFE > 0 < / span > < span class = cF0 > )
< a name = " l190 " > < / a > < / span > < span class = cF7 > { < / span > < span class = cF0 >
< a name = " l191 " > < / a > NetLog ( < / span > < span class = cF6 > & quot ; IPV4 PACKET ALLOCATE : Ethernet Frame Allocate failed . & quot ; < / span > < span class = cF0 > ) ;
< a name = " l192 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > de_index ;
< a name = " l193 " > < / a > < / span > < span class = cF7 > } < / span > < span class = cF0 >
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< a name = " l194 " > < / a >
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< a name = " l195 " > < / a > internet_header_length = < / span > < span class = cFE > 5 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // ... why. need a #define</span><span class=cF0>
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< a name = " l196 " > < / a >
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< a name = " l197 " > < / a > header = ipv4_frame ;
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< a name = " l198 " > < / a >
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< a name = " l199 " > < / a > header - & gt ; version_ihl = internet_header_length | < / span > < span class = cFE > 4 < / span > < span class = cF0 > & lt ; & lt ; < / span > < span class = cFE > 4 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // ? TODO: needs #define</span><span class=cF0>
< a name = " l200 " > < / a > header - & gt ; dscp_ecn = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // a clear define of what this actually means would be good</span><span class=cF0>
< a name = " l201 " > < / a > header - & gt ; total_length = < / span > < span class = cF5 > EndianU16 < / span > < span class = cF0 > ( internet_header_length * < / span > < span class = cFE > 4 < / span > < span class = cF0 > + length ) ; < / span > < span class = cF2 > //...why?</span><span class=cF0>
< a name = " l202 " > < / a > header - & gt ; identification = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // define would be clearer</span><span class=cF0>
< a name = " l203 " > < / a > header - & gt ; flags_fragment_offset = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // define would be clearer</span><span class=cF0>
< a name = " l204 " > < / a > header - & gt ; time_to_live = IPV4_TTL ;
< a name = " l205 " > < / a > header - & gt ; protocol = protocol ;
< a name = " l206 " > < / a > header - & gt ; header_checksum = < / span > < span class = cFE > 0 < / span > < span class = cF0 > ; < / span > < span class = cF2 > // why is 0 ok?</span><span class=cF0>
< a name = " l207 " > < / a > header - & gt ; source_ip_address = < / span > < span class = cF5 > EndianU32 < / span > < span class = cF0 > ( source_ip_address ) ;
< a name = " l208 " > < / a > header - & gt ; destination_ip_address = < / span > < span class = cF5 > EndianU32 < / span > < span class = cF0 > ( destination_ip_address ) ;
< a name = " l209 " > < / a > header - & gt ; header_checksum = IPV4Checksum ( header , internet_header_length * < / span > < span class = cFE > 4 < / span > < span class = cF0 > ) ; < / span > < span class = cF2 > //why the 4's...</span><span class=cF0>
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< a name = " l210 " > < / a >
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< a name = " l211 " > < / a > * frame_out = ipv4_frame + < / span > < span class = cF1 > sizeof < / span > < span class = cF0 > ( CIPV4Header ) ;
< a name = " l212 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > de_index ;
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< a name = " l213 " > < / a > }
< a name = " l214 " > < / a >
< a name = " l215 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4PacketFinish ( < / span > < span class = cF9 > I64 < / span > < span class = cF0 > de_index ) < / span > < span class = cF2 > //alias for EthernetFrameFinish</span><span class=cF0>
< a name = " l216 " > < / a > {
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< a name = " l217 " > < / a > EthernetFrameFinish ( de_index ) ;
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< a name = " l218 " > < / a > }
< a name = " l219 " > < / a >
< a name = " l220 " > < / a > < / span > < span class = cF9 > U32 < / span > < span class = cF0 > IPV4AddressGet ( )
< a name = " l221 " > < / a > {
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< a name = " l222 " > < / a > < / span > < span class = cF1 > return < / span > < span class = cF0 > ipv4_globals . local_ip ;
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< a name = " l223 " > < / a > }
< a name = " l224 " > < / a >
< a name = " l225 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4AddressSet ( < / span > < span class = cF9 > U32 < / span > < span class = cF0 > ip_address )
< a name = " l226 " > < / a > {
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< a name = " l227 " > < / a > ipv4_globals . local_ip = ip_address ;
< a name = " l228 " > < / a > ipv4_globals . local_ip_be = < / span > < span class = cF5 > EndianU32 < / span > < span class = cF0 > ( ip_address ) ;
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< a name = " l229 " > < / a >
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< a name = " l230 " > < / a > ARPLocalIPV4Set ( ip_address ) ;
< a name = " l231 " > < / a >
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< a name = " l232 " > < / a > }
< a name = " l233 " > < / a >
< a name = " l234 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4SubnetSet ( < / span > < span class = cF9 > U32 < / span > < span class = cF0 > router_address , < / span > < span class = cF9 > U32 < / span > < span class = cF0 > subnet_mask )
< a name = " l235 " > < / a > {
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< a name = " l236 " > < / a > ipv4_globals . ipv4_router_address = router_address ;
< a name = " l237 " > < / a > ipv4_globals . ipv4_subnet_mask = subnet_mask ;
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< a name = " l238 " > < / a > }
< a name = " l239 " > < / a >
< a name = " l240 " > < / a > < / span > < span class = cF2 > //I64</span><span class=cF0>
< a name = " l241 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4PacketParse ( CIPV4Packet * packet_out , CEthernetFrame * ethernet_frame )
< a name = " l242 " > < / a > {
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< a name = " l243 " > < / a > < / span > < span class = cF2 > //...if ethertype not ipv4 error?</span><span class=cF0>
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< a name = " l244 " > < / a >
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< a name = " l245 " > < / a > < / span > < span class = cF2 > // TODO: Check ethernet_frame length ! ... we need to know what's appropriate</span><span class=cF0>
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< a name = " l246 " > < / a >
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< a name = " l247 " > < / a > CIPV4Header * header = ethernet_frame - & gt ; data ;
< a name = " l248 " > < / a > < / span > < span class = cF9 > I64 < / span > < span class = cF0 > header_length = ( header - & gt ; version_ihl & amp ; < / span > < span class = cFE > 0x0F < / span > < span class = cF0 > ) * < / span > < span class = cFE > 4 < / span > < span class = cF0 > ; < / span > < span class = cF2 > //this Has to go. at least abstract or something..</span><span class=cF0>
< a name = " l249 " > < / a > < / span > < span class = cF9 > U16 < / span > < span class = cF0 > total_length = < / span > < span class = cF5 > EndianU16 < / span > < span class = cF0 > ( header - & gt ; total_length ) ;
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< a name = " l250 " > < / a >
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< a name = " l251 " > < / a > packet_out - & gt ; ethernet_frame = ethernet_frame ;
< a name = " l252 " > < / a > packet_out - & gt ; source_ip_address = < / span > < span class = cF5 > EndianU32 < / span > < span class = cF0 > ( header - & gt ; source_ip_address ) ;
< a name = " l253 " > < / a > packet_out - & gt ; destination_ip_address = < / span > < span class = cF5 > EndianU32 < / span > < span class = cF0 > ( header - & gt ; destination_ip_address ) ;
< a name = " l254 " > < / a > packet_out - & gt ; protocol = header - & gt ; protocol ;
< a name = " l255 " > < / a > packet_out - & gt ; data = ethernet_frame - & gt ; data + header_length ;
< a name = " l256 " > < / a > packet_out - & gt ; length = total_length - header_length ;
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< a name = " l257 " > < / a >
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< a name = " l258 " > < / a > < / span > < span class = cF2 > //</span><span class=cF0> </span><span class=cF2>return 0;</span><span class=cF0>
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< a name = " l259 " > < / a > }
< a name = " l260 " > < / a >
< a name = " l261 " > < / a > < / span > < span class = cF1 > U0 < / span > < span class = cF0 > IPV4Rep ( )
< a name = " l262 " > < / a > {
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< a name = " l263 " > < / a > < / span > < span class = cF6 > & quot ; $ LTBLUE $ IPV4 Report : $ FG $ \ n \ n & quot ; < / span > < span class = cF0 > ;
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< a name = " l264 " > < / a >
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< a name = " l265 " > < / a > < / span > < span class = cF6 > & quot ; Local IPV4 : % d . % d . % d . % d \ n & quot ; < / span > < span class = cF0 > ,
< a name = " l266 " > < / a > ipv4_globals . local_ip . u8 [ < / span > < span class = cFE > 3 < / span > < span class = cF0 > ] ,
< a name = " l267 " > < / a > ipv4_globals . local_ip . u8 [ < / span > < span class = cFE > 2 < / span > < span class = cF0 > ] ,
< a name = " l268 " > < / a > ipv4_globals . local_ip . u8 [ < / span > < span class = cFE > 1 < / span > < span class = cF0 > ] ,
< a name = " l269 " > < / a > ipv4_globals . local_ip . u8 [ < / span > < span class = cFE > 0 < / span > < span class = cF0 > ] ;
< a name = " l270 " > < / a > < / span > < span class = cF6 > & quot ; Router IPV4 : % d . % d . % d . % d \ n & quot ; < / span > < span class = cF0 > ,
< a name = " l271 " > < / a > ipv4_globals . ipv4_router_address . u8 [ < / span > < span class = cFE > 3 < / span > < span class = cF0 > ] ,
< a name = " l272 " > < / a > ipv4_globals . ipv4_router_address . u8 [ < / span > < span class = cFE > 2 < / span > < span class = cF0 > ] ,
< a name = " l273 " > < / a > ipv4_globals . ipv4_router_address . u8 [ < / span > < span class = cFE > 1 < / span > < span class = cF0 > ] ,
< a name = " l274 " > < / a > ipv4_globals . ipv4_router_address . u8 [ < / span > < span class = cFE > 0 < / span > < span class = cF0 > ] ;
< a name = " l275 " > < / a > < / span > < span class = cF6 > & quot ; Subnet IPV4 : % d . % d . % d . % d \ n & quot ; < / span > < span class = cF0 > ,
< a name = " l276 " > < / a > ipv4_globals . ipv4_subnet_mask . u8 [ < / span > < span class = cFE > 3 < / span > < span class = cF0 > ] ,
< a name = " l277 " > < / a > ipv4_globals . ipv4_subnet_mask . u8 [ < / span > < span class = cFE > 2 < / span > < span class = cF0 > ] ,
< a name = " l278 " > < / a > ipv4_globals . ipv4_subnet_mask . u8 [ < / span > < span class = cFE > 1 < / span > < span class = cF0 > ] ,
< a name = " l279 " > < / a > ipv4_globals . ipv4_subnet_mask . u8 [ < / span > < span class = cFE > 0 < / span > < span class = cF0 > ] ;
< a name = " l280 " > < / a > < / span > < span class = cF6 > & quot ; \ n & quot ; < / span > < span class = cF0 > ;
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< a name = " l281 " > < / a > }
< a name = " l282 " > < / a >
< a name = " l283 " > < / a > < / span > < span class = cF2 > // IPV4 handler moved to NetHandlerTask file.</span><span class=cF0>
< a name = " l284 " > < / a > IPV4GlobalsInit ; < / span > < / pre > < / body >
< / html >
