/src/PcapPlusPlus/Packet++/header/SllLayer.h
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1 | | #ifndef PACKETPP_SLL_LAYER |
2 | | #define PACKETPP_SLL_LAYER |
3 | | |
4 | | #include "MacAddress.h" |
5 | | #include "Layer.h" |
6 | | |
7 | | /// @file |
8 | | |
9 | | /** |
10 | | * \namespace pcpp |
11 | | * \brief The main namespace for the PcapPlusPlus lib |
12 | | */ |
13 | | namespace pcpp |
14 | | { |
15 | | |
16 | | /** |
17 | | * @struct sll_header |
18 | | * Represents SLL header |
19 | | */ |
20 | | #pragma pack(push, 1) |
21 | | struct sll_header |
22 | | { |
23 | | /** Specifies whether packet was: specifically sent to us by somebody else (value=0); |
24 | | * broadcast by somebody else (value=1); multicast, but not broadcast, by somebody else (value=2); |
25 | | * sent to somebody else by somebody else (value=3); sent by us (value=4) |
26 | | **/ |
27 | | uint16_t packet_type; |
28 | | /** Contains a Linux ARPHRD_ value for the link-layer device type */ |
29 | | uint16_t ARPHRD_type; |
30 | | /** Contains the length of the link-layer address of the sender of the packet. That length could be zero */ |
31 | | uint16_t link_layer_addr_len; |
32 | | /** contains the link-layer address of the sender of the packet; the number of bytes of that field that are |
33 | | * meaningful is specified by the link-layer address length field |
34 | | **/ |
35 | | uint8_t link_layer_addr[8]; |
36 | | /** Contains an Ethernet protocol type of the next layer */ |
37 | | uint16_t protocol_type; |
38 | | }; |
39 | | #pragma pack(pop) |
40 | | |
41 | | /** |
42 | | * @class SllLayer |
43 | | * Represents an SLL (Linux cooked capture) protocol layer |
44 | | */ |
45 | | class SllLayer : public Layer |
46 | | { |
47 | | public: |
48 | | /** |
49 | | * A constructor that creates the layer from an existing packet raw data |
50 | | * @param[in] data A pointer to the raw data (will be casted to ether_header) |
51 | | * @param[in] dataLen Size of the data in bytes |
52 | | * @param[in] packet A pointer to the Packet instance where layer will be stored in |
53 | | */ |
54 | 8.22k | SllLayer(uint8_t* data, size_t dataLen, Packet* packet) : Layer(data, dataLen, NULL, packet) { m_Protocol = SLL; } |
55 | | |
56 | | /** |
57 | | * A constructor that creates a new SLL header and allocates the data |
58 | | * @param[in] packetType The packet type |
59 | | * @param[in] ARPHRDType The ARPHRD type |
60 | | */ |
61 | | SllLayer(uint16_t packetType, uint16_t ARPHRDType); |
62 | | |
63 | 0 | ~SllLayer() {} |
64 | | |
65 | | /** |
66 | | * Get a pointer to the Sll header. Notice this points directly to the data, so every change will change the actual packet data |
67 | | * @return A pointer to the sll_header |
68 | | */ |
69 | 6.18k | sll_header* getSllHeader() const { return (sll_header*)m_Data; } |
70 | | |
71 | | /** |
72 | | * A setter for the link layer address field |
73 | | * @param[in] addr The address to set. Memory will be copied to packet |
74 | | * @param[in] addrLength Address length, must be lower or equal to 8 (which is max length for SLL address) |
75 | | * @return True if address was set successfully, or false of addrLength is out of bounds (0 or larger than 8) |
76 | | */ |
77 | | bool setLinkLayerAddr(uint8_t* addr, size_t addrLength); |
78 | | |
79 | | /** |
80 | | * Set a MAC address in the link layer address field |
81 | | * @param[in] macAddr MAC address to set |
82 | | * @return True if address was set successfully, false if MAC address isn't valid or if set failed |
83 | | */ |
84 | | bool setMacAddressAsLinkLayer(MacAddress macAddr); |
85 | | |
86 | | /** |
87 | | * Currently identifies the following next layers: IPv4Layer, IPv6Layer, ArpLayer, VlanLayer, PPPoESessionLayer, PPPoEDiscoveryLayer, |
88 | | * MplsLayer. |
89 | | * Otherwise sets PayloadLayer |
90 | | */ |
91 | | void parseNextLayer(); |
92 | | |
93 | | /** |
94 | | * @return Size of sll_header |
95 | | */ |
96 | 0 | size_t getHeaderLen() const { return sizeof(sll_header); } |
97 | | |
98 | | /** |
99 | | * Calculate the next protocol type for known protocols: IPv4, IPv6, ARP, VLAN |
100 | | */ |
101 | | void computeCalculateFields(); |
102 | | |
103 | | std::string toString() const; |
104 | | |
105 | 8.22k | OsiModelLayer getOsiModelLayer() const { return OsiModelDataLinkLayer; } |
106 | | }; |
107 | | |
108 | | } // namespace pcpp |
109 | | |
110 | | #endif /* PACKETPP_SLL_LAYER */ |