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Document the network headers

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This commit is contained in:
Baptiste Wicht 2016-09-27 12:49:29 +02:00
parent 978908d607
commit 2e8d8cf052
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GPG Key ID: C5566B6C7F884532
1 changed files with 52 additions and 31 deletions
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83
tlib/include/tlib/net_constants.hpp
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@ -15,6 +15,9 @@ THOR_NAMESPACE(tlib, network) {
namespace ip { namespace ip {
/*!
* \brief An IP Addres helper
*/
struct address { struct address {
uint32_t raw_address = 0; uint32_t raw_address = 0;
@ -43,17 +46,20 @@ inline address make_address(uint8_t a, uint8_t b, uint8_t c, uint8_t d){
return addr; return addr;
} }
/*!
* \brief The header of an IP packet
*/
struct header { struct header {
uint8_t version_ihl; uint8_t version_ihl; ///< The version and header length
uint8_t dscp_ecn; uint8_t dscp_ecn;
uint16_t total_len; uint16_t total_len; ///< The total length of the packet
uint16_t identification; uint16_t identification; ///< The identification of the packet
uint16_t flags_offset; uint16_t flags_offset; ///< The flags and data offset
uint8_t ttl; uint8_t ttl; ///< The time to live of the packet
uint8_t protocol; uint8_t protocol; ///< The protocol used
uint16_t header_checksum; uint16_t header_checksum; ///< The checksum
uint32_t source_ip; uint32_t source_ip; ///< The source IP address
uint32_t target_ip; uint32_t target_ip; ///< The target IP address
} __attribute__((packed)); } __attribute__((packed));
struct packet_descriptor { struct packet_descriptor {
@ -75,10 +81,13 @@ struct address {
char mac[6]; char mac[6];
} __attribute__((packed)); } __attribute__((packed));
/*!
* \brief The header of an ethernet packet
*/
struct header { struct header {
address target; address target; ///< The target MAC address
address source; address source; ///< The source MAC address
uint16_t type; uint16_t type; ///< The type of packet (the child layer)
} __attribute__((packed)); } __attribute__((packed));
enum class ether_type { enum class ether_type {
@ -117,16 +126,22 @@ enum class type : uint8_t {
TRACEROUTE = 30 TRACEROUTE = 30
}; };
/*!
* \brief The header of an ICMP packet
*/
struct header { struct header {
uint8_t type; uint8_t type; ///< The type of message
uint8_t code; uint8_t code; ///< The code of the transmission (sub-type)
uint16_t checksum; uint16_t checksum; ///< The checksum
uint32_t rest; ///< Depends on the type of packet type uint32_t rest; ///< Depends on the type of packet type
} __attribute__((packed)); } __attribute__((packed));
/*!
* \brief The rest header of an ICMP request packet
*/
struct echo_request_header { struct echo_request_header {
uint16_t identifier; uint16_t identifier; ///< The identifier
uint16_t sequence; uint16_t sequence; ///< The sequence number
} __attribute__((packed)); } __attribute__((packed));
struct packet_descriptor { struct packet_descriptor {
@ -149,13 +164,16 @@ struct packet_descriptor {
namespace dns { namespace dns {
/*!
* \brief The header of a DNS packet
*/
struct header { struct header {
uint16_t identification; uint16_t identification; ///< The identification of the query
uint16_t flags; uint16_t flags; ///< The flags
uint16_t questions; uint16_t questions; ///< The number of questions
uint16_t answers; uint16_t answers; ///< The number of answers
uint16_t authority_rrs; uint16_t authority_rrs; ///< The number of authorithy Records
uint16_t additional_rrs; uint16_t additional_rrs; ///< The number of additional Records
} __attribute__((packed)); } __attribute__((packed));
struct packet_descriptor { struct packet_descriptor {
@ -176,15 +194,18 @@ struct packet_descriptor {
namespace tcp { namespace tcp {
/*!
* \brief The header of a TCP packet
*/
struct header { struct header {
uint16_t source_port; uint16_t source_port; ///< The TCP source port
uint16_t target_port; uint16_t target_port; ///< The TCP target port
uint32_t sequence_number; uint32_t sequence_number; ///< The sequence number
uint32_t ack_number; uint32_t ack_number; ///< The acknowledge number
uint16_t flags; uint16_t flags; ///< The flags
uint16_t window_size; uint16_t window_size; ///< The size of the receiving window
uint16_t checksum; uint16_t checksum; ///< The checksum
uint16_t urgent_pointer; uint16_t urgent_pointer; ///< Indicates if the packet is urgent
} __attribute__((packed)); } __attribute__((packed));
struct packet_descriptor { struct packet_descriptor {