mirror of
https://github.com/pavel-odintsov/fastnetmon.git
synced 2024-09-21 02:17:16 +00:00
Poretd parser to new logic which does not alter buffer content during parsing process
This commit is contained in:
parent
e019b46802
commit
0f0ba0d063
@ -1324,8 +1324,8 @@ bool read_simple_packet(uint8_t* buffer, size_t buffer_length, simple_packet_t&
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packet.ip_fragmented = root.getIpFragmented();
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packet.ts.tv_sec = root.getTsSec();
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packet.ts.tv_usec = root.getTsMsec();
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packet.packet_payload_length = root.getPacketPayloadLength();
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packet.packet_payload_full_length = root.getPacketPayloadFullLength();
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packet.captured_payload_length = root.getPacketPayloadLength();
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packet.payload_full_length = root.getPacketPayloadFullLength();
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packet.packet_direction = (direction_t)root.getPacketDirection();
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packet.source = (source_t)root.getSource();
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} catch (kj::Exception e) {
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@ -1361,8 +1361,8 @@ bool write_simple_packet(int fd, simple_packet_t& packet, bool populate_ipv6) {
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capnp_packet.setIpFragmented(packet.ip_fragmented);
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capnp_packet.setTsSec(packet.ts.tv_sec);
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capnp_packet.setTsMsec(packet.ts.tv_usec);
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capnp_packet.setPacketPayloadLength(packet.packet_payload_length);
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capnp_packet.setPacketPayloadFullLength(packet.packet_payload_full_length);
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capnp_packet.setPacketPayloadLength(packet.captured_payload_length);
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capnp_packet.setPacketPayloadFullLength(packet.payload_full_length);
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capnp_packet.setPacketDirection(packet.packet_direction);
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capnp_packet.setSource(packet.source);
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capnp_packet.setSrcAsn(packet.src_asn);
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@ -38,6 +38,9 @@ class simple_packet_t {
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in6_addr src_ipv6{};
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in6_addr dst_ipv6{};
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uint8_t source_mac[6]{};
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uint8_t destination_mac[6]{};
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// ASNs
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uint32_t src_asn = 0;
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uint32_t dst_asn = 0;
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@ -79,17 +82,22 @@ class simple_packet_t {
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// If IP has don't fragment flag
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bool ip_dont_fragment = false;
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// Fragment offset in bytes when fragmentation involved
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uint16_t ip_fragment_offset = 0;
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// Time when we actually received this packet, we use quite rough and inaccurate but very fast time source for it
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time_t arrival_time = 0;
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// Timestamp of packet as reported by Netflow or IPFIX agent on device, it may be very inaccurate as nobody cares about time on equipment
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struct timeval ts = { 0, 0 };
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void* packet_payload_pointer = nullptr;
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int32_t packet_payload_length = 0;
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void* payload_pointer = nullptr;
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// In case of cropped packets we use this field
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uint32_t packet_payload_full_length = 0;
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// Part of packet we captured from wire. It may not be full length of packet
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int32_t captured_payload_length = 0;
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// Full length of packet we observed. It may be larger then packet_captured_payload_length in case of cropped mirror or sFlow traffic
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uint32_t payload_full_length = 0;
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// Forwarding status
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forwarding_status_t forwarding_status = forwarding_status_t::unknown;
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@ -421,9 +421,9 @@ bool process_sflow_flow_sample(uint8_t* data_pointer,
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}
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// Pass pointer to raw header to FastNetMon processing functions
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packet.packet_payload_pointer = header_payload_pointer;
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packet.packet_payload_full_length = sflow_raw_protocol_header.frame_length_before_sampling;
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packet.packet_payload_length = sflow_raw_protocol_header.header_size;
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packet.payload_pointer = header_payload_pointer;
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packet.payload_full_length = sflow_raw_protocol_header.frame_length_before_sampling;
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packet.captured_payload_length = sflow_raw_protocol_header.header_size;
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packet.sample_ratio = sflow_sample_header_unified_accessor.sampling_rate;
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@ -2,6 +2,8 @@
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#include "all_logcpp_libraries.hpp"
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#include "network_data_structures.hpp"
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#include <algorithm>
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#include <iterator>
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#include <cstring>
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using namespace network_data_stuctures;
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@ -11,18 +13,17 @@ using namespace network_data_stuctures;
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bool decode_mpls = false;
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// Our own native function to convert wire packet into simple_packet_t
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// TODO: development is going here, we still need to add number of options here
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parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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parser_code_t parse_raw_packet_to_simple_packet_full_ng(const uint8_t* pointer,
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int length_before_sampling,
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int captured_length,
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simple_packet_t& packet,
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bool unpack_gre,
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bool read_packet_length_from_ip_header) {
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// We are using pointer copy because we are changing it
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uint8_t* local_pointer = pointer;
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const uint8_t* local_pointer = pointer;
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// It's very nice for doing checks
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uint8_t* end_pointer = pointer + captured_length;
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const uint8_t* end_pointer = pointer + captured_length;
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// Return error if it shorter then ethernet headers
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if (local_pointer + sizeof(ethernet_header_t) > end_pointer) {
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@ -30,29 +31,35 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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}
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ethernet_header_t* ethernet_header = (ethernet_header_t*)local_pointer;
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ethernet_header->convert();
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// Copy Ethernet MAC addresses to packet structure using native C++ approach to avoid touching memory with memcpy
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std::copy(std::begin(ethernet_header->source_mac), std::end(ethernet_header->source_mac), std::begin(packet.source_mac));
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std::copy(std::begin(ethernet_header->destination_mac), std::end(ethernet_header->destination_mac), std::begin(packet.destination_mac));
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local_pointer += sizeof(ethernet_header_t);
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if (ethernet_header->ethertype == IanaEthertypeVLAN) {
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// Copy ethertype as we may need to change it below
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uint16_t ethertype = ethernet_header->get_ethertype_host_byte_order();
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if (ethertype == IanaEthertypeVLAN) {
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// Return error if it shorter then vlan header
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if (local_pointer + sizeof(ethernet_vlan_header_t) > end_pointer) {
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return parser_code_t::memory_violation;
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}
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ethernet_vlan_header_t* ethernet_vlan_header = (ethernet_vlan_header_t*)local_pointer;
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ethernet_vlan_header->convert();
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packet.vlan = ethernet_vlan_header->vlan_id;
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packet.vlan = ethernet_vlan_header->get_vlan_id_host_byte_order();
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local_pointer += sizeof(ethernet_vlan_header_t);
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// Change ethernet ethertype to vlan's ethertype
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ethernet_header->ethertype = ethernet_vlan_header->ethertype;
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// Change ethertype to vlan's ethertype
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ethertype = ethernet_vlan_header->get_ethertype_host_byte_order();
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}
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if (decode_mpls) {
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if (ethernet_header->ethertype == IanaEthertypeMPLS_unicast) {
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if (ethertype == IanaEthertypeMPLS_unicast) {
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REPEAT_MPLS_STRIP:
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if (local_pointer + sizeof(mpls_label_t) > end_pointer) {
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return parser_code_t::memory_violation;
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@ -75,7 +82,7 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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// Here we store IPv4 or IPv6 l4 protocol numbers
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uint8_t protocol = 0;
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if (ethernet_header->ethertype == IanaEthertypeIPv4) {
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if (ethertype == IanaEthertypeIPv4) {
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// Return error if pointer is shorter then IP header
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if (local_pointer + sizeof(ipv4_header_t) > end_pointer) {
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return parser_code_t::memory_violation;
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@ -83,46 +90,54 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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ipv4_header_t* ipv4_header = (ipv4_header_t*)local_pointer;
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// Populate IP specific options in packet structure before making any conversions, use network representation of
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// addresses
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packet.src_ip = ipv4_header->source_ip;
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packet.dst_ip = ipv4_header->destination_ip;
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// Use network representation of addresses
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packet.src_ip = ipv4_header->get_source_ip_network_byte_order();
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packet.dst_ip = ipv4_header->get_destination_ip_network_byte_order();
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packet.ip_protocol_version = 4;
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// Convert all integers in IP header to little endian
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ipv4_header->convert();
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packet.ttl = ipv4_header->ttl;
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packet.ttl = ipv4_header->get_ttl();
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// We need this specific field for Flow Spec mitigation mode
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packet.ip_length = ipv4_header->total_length;
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packet.ip_length = ipv4_header->get_total_length_host_byte_order();
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packet.ip_dont_fragment = ipv4_header->dont_fragment_flag;
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packet.ip_dont_fragment = ipv4_header->get_dont_fragment_flag();
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packet.ip_fragmented = ipv4_header->is_fragmented();
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packet.ip_more_fragments = ipv4_header->more_fragments_flag;
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packet.ip_more_fragments = ipv4_header->get_more_fragments_flag();
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// We must use special function to recover value in a format useable for our consumption
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// We must not read this field directly
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packet.ip_fragment_offset = ipv4_header->get_fragment_offset_bytes();
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// We keep these variables to maintain backward compatibility with parse_raw_packet_to_simple_packet_full()
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packet.packet_payload_length = length_before_sampling;
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packet.packet_payload_full_length = length_before_sampling;
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packet.captured_payload_length = length_before_sampling;
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packet.payload_full_length = length_before_sampling;
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// Pointer to payload
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packet.packet_payload_pointer = (void*)pointer;
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packet.payload_pointer = (void*)pointer;
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protocol = ipv4_header->protocol;
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protocol = ipv4_header->get_protocol();
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packet.protocol = protocol;
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if (read_packet_length_from_ip_header) {
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packet.length = ipv4_header->total_length;
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packet.length = ipv4_header->get_total_length_host_byte_order();
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} else {
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packet.length = length_before_sampling;
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}
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// We need to handle fragmented traffic. In case of IPv4 fragmentation only first packet carries UDP / TCP / other headers
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// and consequent packets simply lack of this information and we know only protocol for them.
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// We can consequent packets by non zero fragment_offset
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if (ipv4_header->get_fragment_offset_bytes() != 0) {
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// The best we can do it so stop processing here and report success
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return parser_code_t::success;
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}
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// Ignore all IP options and shift pointer to L3 payload
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local_pointer += 4 * ipv4_header->ihl;
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} else if (ethernet_header->ethertype == IanaEthertypeIPv6) {
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local_pointer += 4 * ipv4_header->get_ihl();
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} else if (ethertype == IanaEthertypeIPv6) {
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// Return error if pointer is shorter then IP header
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if (local_pointer + sizeof(ipv6_header_t) > end_pointer) {
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return parser_code_t::memory_violation;
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@ -130,31 +145,29 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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ipv6_header_t* ipv6_header = (ipv6_header_t*)local_pointer;
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// Convert all integers in IP header to little endian
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ipv6_header->convert();
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// TODO: we may use std::copy for it to avoid touching memory with memcpy
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memcpy(&packet.src_ipv6, ipv6_header->source_address, sizeof(packet.src_ipv6));
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memcpy(&packet.dst_ipv6, ipv6_header->destination_address, sizeof(packet.dst_ipv6));
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packet.ip_protocol_version = 6;
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packet.ttl = ipv6_header->hop_limit;
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packet.ttl = ipv6_header->get_hop_limit();
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// We need this specific field for Flow Spec mitigation mode
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packet.ip_length = ipv6_header->payload_length;
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packet.ip_length = ipv6_header->get_payload_length();
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// We keep these variables to maintain backward compatibility with parse_raw_packet_to_simple_packet_full()
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packet.packet_payload_length = length_before_sampling;
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packet.packet_payload_full_length = length_before_sampling;
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packet.captured_payload_length = length_before_sampling;
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packet.payload_full_length = length_before_sampling;
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// Pointer to payload
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packet.packet_payload_pointer = (void*)pointer;
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packet.payload_pointer = (void*)pointer;
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protocol = ipv6_header->next_header;
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protocol = ipv6_header->get_next_header();
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packet.protocol = protocol;
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if (read_packet_length_from_ip_header) {
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packet.length = ipv6_header->payload_length;
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packet.length = ipv6_header->get_payload_length();
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} else {
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packet.length = length_before_sampling;
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}
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@ -183,12 +196,12 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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if (protocol == IpProtocolNumberIPV6_FRAG) {
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ipv6_extension_header_fragment_t* ipv6_extension_header_fragment = (ipv6_extension_header_fragment_t*)local_pointer;
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ipv6_extension_header_fragment->convert();
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// If we received this header then we assume that packet was fragmented
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packet.ip_fragmented = true;
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packet.ip_more_fragments = ipv6_extension_header_fragment->more_fragments;
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packet.ip_more_fragments = ipv6_extension_header_fragment->get_more_fragments();
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packet.ip_fragment_offset = ipv6_extension_header_fragment->get_fragment_offset_bytes();
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// We stop processing here as I believe that it's enough to know that this traffic was fragmented
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// We do not parse nested protocol in this case at all
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@ -199,7 +212,7 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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return parser_code_t::no_ipv6_options_support;
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}
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} else if (ethernet_header->ethertype == IanaEthertypeARP) {
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} else if (ethertype == IanaEthertypeARP) {
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// it's not parser error of course but we need to have visibility about this case
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return parser_code_t::arp;
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} else {
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@ -212,14 +225,13 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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}
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tcp_header_t* tcp_header = (tcp_header_t*)local_pointer;
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tcp_header->convert();
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packet.source_port = tcp_header->source_port;
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packet.destination_port = tcp_header->destination_port;
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packet.source_port = tcp_header->get_source_port_host_byte_order();
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packet.destination_port = tcp_header->get_destination_port_host_byte_order();
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// TODO: rework this code to use structs with bit fields
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packet.flags = tcp_header->fin * 0x01 + tcp_header->syn * 0x02 + tcp_header->rst * 0x04 +
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tcp_header->psh * 0x08 + tcp_header->ack * 0x10 + tcp_header->urg * 0x20;
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packet.flags = tcp_header->get_fin() * 0x01 + tcp_header->get_syn() * 0x02 + tcp_header->get_rst() * 0x04 +
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tcp_header->get_psh() * 0x08 + tcp_header->get_ack() * 0x10 + tcp_header->get_urg() * 0x20;
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} else if (protocol == IpProtocolNumberUDP) {
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if (local_pointer + sizeof(udp_header_t) > end_pointer) {
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@ -227,32 +239,32 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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}
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udp_header_t* udp_header = (udp_header_t*)local_pointer;
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udp_header->convert();
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packet.source_port = udp_header->source_port;
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packet.destination_port = udp_header->destination_port;
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packet.source_port = udp_header->get_source_port_host_byte_order();
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packet.destination_port = udp_header->get_destination_port_host_byte_order();
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} else if (protocol == IpProtocolNumberGRE) {
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if (!unpack_gre) {
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// We do not decode it automatically but we can report source and destination IPs for it to FNM processing
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return parser_code_t::success;
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}
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if (local_pointer + sizeof(gre_packet_t) > end_pointer) {
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if (local_pointer + sizeof(gre_header_t) > end_pointer) {
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return parser_code_t::memory_violation;
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}
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gre_packet_t* gre_header = (gre_packet_t*)local_pointer;
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gre_header->convert();
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gre_header_t* gre_header = (gre_header_t*)local_pointer;
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// Current version of parser does not handle these special codes and we just fail parsing process
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// These flags may extend length of GRE header and current logic is not ready to decode any of them
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if (gre_header->checksum != 0 || gre_header->reserved != 0 || gre_header->version != 0) {
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if (gre_header->get_checksum() != 0 || gre_header->get_reserved() != 0 || gre_header->get_version() != 0) {
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return parser_code_t::broken_gre;
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}
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uint16_t gre_nested_protocol = gre_header->get_protocol_type_host_byte_order();
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// We will try parsing IPv4 only for now
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if (gre_header->protocol_type == IanaEthertypeIPv4) {
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local_pointer += sizeof(gre_packet_t);
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if (gre_nested_protocol == IanaEthertypeIPv4) {
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local_pointer += sizeof(gre_header_t);
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// This function will override all fields in original packet structure by new fields
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bool read_length_from_ip_header = true;
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@ -265,8 +277,8 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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remaining_packet_length, packet, read_length_from_ip_header);
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return nested_packet_parse_result;
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} else if (gre_header->protocol_type == IanaEthertypeERSPAN) {
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local_pointer += sizeof(gre_packet_t);
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} else if (gre_nested_protocol == IanaEthertypeERSPAN) {
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local_pointer += sizeof(gre_header_t);
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// We need to calculate how much data we have after all parsed fields until end of packet to pass it to function below
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int remaining_packet_length = end_pointer - local_pointer;
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@ -294,16 +306,16 @@ parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
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}
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// Our own native function to convert IPv4 packet into simple_packet_t
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parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(uint8_t* pointer,
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parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(const uint8_t* pointer,
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int length_before_sampling,
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int captured_length,
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simple_packet_t& packet,
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bool read_packet_length_from_ip_header) {
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// We are using pointer copy because we are changing it
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uint8_t* local_pointer = pointer;
|
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const uint8_t* local_pointer = pointer;
|
||||
|
||||
// It's very nice for doing checks
|
||||
uint8_t* end_pointer = pointer + captured_length;
|
||||
const uint8_t* end_pointer = pointer + captured_length;
|
||||
|
||||
|
||||
// Here we store IPv4 or IPv6 l4 protocol numbers
|
||||
@ -317,40 +329,36 @@ parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(uint8_t* pointer,
|
||||
|
||||
ipv4_header_t* ipv4_header = (ipv4_header_t*)local_pointer;
|
||||
|
||||
// Populate IP specific options in packet structure before making any conversions, use network representation of
|
||||
// addresses
|
||||
packet.src_ip = ipv4_header->source_ip;
|
||||
packet.dst_ip = ipv4_header->destination_ip;
|
||||
// Use network representation of addresses
|
||||
packet.src_ip = ipv4_header->get_source_ip_network_byte_order();
|
||||
packet.dst_ip = ipv4_header->get_destination_ip_network_byte_order();
|
||||
|
||||
packet.ip_protocol_version = 4;
|
||||
|
||||
// Convert all integers in IP header to little endian
|
||||
ipv4_header->convert();
|
||||
|
||||
packet.ttl = ipv4_header->ttl;
|
||||
packet.ip_length = ipv4_header->total_length;
|
||||
packet.ip_dont_fragment = ipv4_header->dont_fragment_flag;
|
||||
packet.ttl = ipv4_header->get_ttl();
|
||||
packet.ip_length = ipv4_header->get_total_length_host_byte_order();
|
||||
packet.ip_dont_fragment = ipv4_header->get_dont_fragment_flag();
|
||||
|
||||
packet.ip_fragmented = ipv4_header->is_fragmented();
|
||||
|
||||
// We keep these variables to maintain backward compatibility with parse_raw_packet_to_simple_packet_full()
|
||||
packet.packet_payload_length = length_before_sampling;
|
||||
packet.packet_payload_full_length = length_before_sampling;
|
||||
packet.captured_payload_length = length_before_sampling;
|
||||
packet.payload_full_length = length_before_sampling;
|
||||
|
||||
// Pointer to payload
|
||||
packet.packet_payload_pointer = (void*)pointer;
|
||||
packet.payload_pointer = (void*)pointer;
|
||||
|
||||
protocol = ipv4_header->protocol;
|
||||
protocol = ipv4_header->get_protocol();
|
||||
packet.protocol = protocol;
|
||||
|
||||
if (read_packet_length_from_ip_header) {
|
||||
packet.length = ipv4_header->total_length;
|
||||
packet.length = ipv4_header->get_total_length_host_byte_order();
|
||||
} else {
|
||||
packet.length = length_before_sampling;
|
||||
}
|
||||
|
||||
// Ignore all IP options and shift pointer to L3 payload
|
||||
local_pointer += 4 * ipv4_header->ihl;
|
||||
local_pointer += 4 * ipv4_header->get_ihl();
|
||||
|
||||
if (protocol == IpProtocolNumberTCP) {
|
||||
if (local_pointer + sizeof(tcp_header_t) > end_pointer) {
|
||||
@ -358,14 +366,13 @@ parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(uint8_t* pointer,
|
||||
}
|
||||
|
||||
tcp_header_t* tcp_header = (tcp_header_t*)local_pointer;
|
||||
tcp_header->convert();
|
||||
|
||||
packet.source_port = tcp_header->source_port;
|
||||
packet.destination_port = tcp_header->destination_port;
|
||||
packet.source_port = tcp_header->get_source_port_host_byte_order();
|
||||
packet.destination_port = tcp_header->get_destination_port_host_byte_order();
|
||||
|
||||
// TODO: rework this code to use structs with bit fields
|
||||
packet.flags = tcp_header->fin * 0x01 + tcp_header->syn * 0x02 + tcp_header->rst * 0x04 +
|
||||
tcp_header->psh * 0x08 + tcp_header->ack * 0x10 + tcp_header->urg * 0x20;
|
||||
packet.flags = tcp_header->get_fin() * 0x01 + tcp_header->get_syn() * 0x02 + tcp_header->get_rst() * 0x04 +
|
||||
tcp_header->get_psh() * 0x08 + tcp_header->get_ack() * 0x10 + tcp_header->get_urg() * 0x20;
|
||||
|
||||
} else if (protocol == IpProtocolNumberUDP) {
|
||||
if (local_pointer + sizeof(udp_header_t) > end_pointer) {
|
||||
@ -373,10 +380,9 @@ parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(uint8_t* pointer,
|
||||
}
|
||||
|
||||
udp_header_t* udp_header = (udp_header_t*)local_pointer;
|
||||
udp_header->convert();
|
||||
|
||||
packet.source_port = udp_header->source_port;
|
||||
packet.destination_port = udp_header->destination_port;
|
||||
packet.source_port = udp_header->get_source_port_host_byte_order();
|
||||
packet.destination_port = udp_header->get_destination_port_host_byte_order();
|
||||
} else {
|
||||
// That's fine, it's not some known protocol but we can export basic information retrieved from IP packet
|
||||
return parser_code_t::success;
|
||||
|
@ -1,7 +1,7 @@
|
||||
#include "fastnetmon_simple_packet.hpp"
|
||||
#include "network_data_structures.hpp"
|
||||
|
||||
network_data_stuctures::parser_code_t parse_raw_packet_to_simple_packet_full_ng(uint8_t* pointer,
|
||||
network_data_stuctures::parser_code_t parse_raw_packet_to_simple_packet_full_ng(const uint8_t* pointer,
|
||||
int length_before_sampling,
|
||||
int captured_length,
|
||||
simple_packet_t& packet,
|
||||
@ -9,7 +9,7 @@ network_data_stuctures::parser_code_t parse_raw_packet_to_simple_packet_full_ng(
|
||||
bool use_packet_length_from_wire);
|
||||
|
||||
|
||||
network_data_stuctures::parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(uint8_t* pointer,
|
||||
network_data_stuctures::parser_code_t parse_raw_ipv4_packet_to_simple_packet_full_ng(const uint8_t* pointer,
|
||||
int length_before_sampling,
|
||||
int captured_length,
|
||||
simple_packet_t& packet,
|
||||
|
Loading…
Reference in New Issue
Block a user