Epagris
8044d8a8b6
- IGMP transmission reworked - IPv4: method for filling in checksum in rendered binary data added
86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
#ifndef ETHERLIB_IPV4_PACKET_H
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#define ETHERLIB_IPV4_PACKET_H
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#include <stdint.h>
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#include "../../packet_registry.h"
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#include "../../packet_sieve.h"
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#include "ipv4_types.h"
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#define ETH_IPv4_PACKET_CLASS (0x0800)
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#define ETH_IPv4_HEADER_SIZE (20)
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typedef enum {
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IP_FLAG_DNF = 0x02,
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IP_FLAG_MF = 0x01
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} IPv4Flags;
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/**
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* IPv4 header structure
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*/
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typedef struct {
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PcktPropsHeader
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// 1. 32-bit
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uint8_t IHL; ///< header size
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uint8_t Version; ///< version (always 4)
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uint8_t DSF; ///< service type
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uint16_t TotalLength; ///< total packet length
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// 2. 32-bit
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uint16_t Identification; ///< identification
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uint8_t Flags; ///< packet flags
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uint16_t FragmentOffset; ///< packet fragmentation offset
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// 3. 32-bit
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uint8_t TTL; ///< Time-To-Live
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uint8_t Protocol; ///< Protocol
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uint16_t HeaderChecksum; ///< header IP-checksum
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// 4. 32-bit
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uint32_t SourceIPAddr; ///< source IP-address
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uint32_t DestIPAddr; ///< destination IP-address
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} IPv4Props;
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struct EthInterface_;
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/**
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* Parse raw IPv4 packets.
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* @param hdr pointer to the IPv4 packet header
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* @param size total packet size
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* @param pcktHdrLe pointer to property storage
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* @return Protocol on success or -1 on failure
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*/
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int parse_ipv4(const uint8_t *hdr, uint32_t size, PcktHeaderElement *pcktHdrLe, struct EthInterface_ *intf, PcktProcFnPassbackData * pb);
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/**
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* Insert IPv4 header.
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* @param hdr space where the header is to be inserted
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* @param headers linked list of header, top is always relevant
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*/
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void insert_ipv4_header(uint8_t *hdr, const PcktHeaderElement *headers, struct EthInterface_ *intf);
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/**
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* Calculate Ethernet IPv4 multicast address from multicast
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* @param hwa
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* @param ipa
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*/
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void ethmc_from_ipmc(uint8_t * hwa, ip4_addr ipa);
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/**
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* Fill IPv4 properties structure based on passed fields. Fields not listed among parameters is set to a default value.
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* @param ipProps IPv4 properties structure to fill
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* @param payloadSize payload size in bytes (contained header AND its payload size)
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* @param protocol contained packet protocol
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* @param srcIpA source IP address
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* @param dstIpA destination IP address
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*/
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void ipv4_fill_props(IPv4Props *ipProps, uint32_t payloadSize, uint16_t protocol, ip4_addr srcIpA, ip4_addr dstIpA);
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/**
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* Fill in IPv4 checksum, based on header data.
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* @param hdr Pointer to the IPv4 header's beginning. Checksum field's position will be written.
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*/
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void ipv4_fill_in_chksum(uint8_t * hdr);
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#endif //ETHERLIB_IPV4_PACKET_H
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