ip.h

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#ifndef _GPXE_IP_H
#define _GPXE_IP_H

/** @file
 *
 * IP protocol
 *
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <stdint.h>
#include <gpxe/in.h>
#include <gpxe/list.h>
#include <gpxe/retry.h>

struct io_buffer;
struct net_device;
struct net_protocol;

/* IP constants */

#define IP_VER                  0x40U
#define IP_MASK_VER             0xf0U
#define IP_MASK_HLEN            0x0fU
#define IP_MASK_OFFSET          0x1fffU
#define IP_MASK_DONOTFRAG       0x4000U
#define IP_MASK_MOREFRAGS       0x2000U
#define IP_PSHLEN       12

/* IP header defaults */
#define IP_TOS          0
#define IP_TTL          64

#define IP_FRAG_IOB_SIZE        1500
#define IP_FRAG_TIMEOUT         50

/** An IPv4 packet header */
struct iphdr {
        uint8_t  verhdrlen;
        uint8_t  service;
        uint16_t len;
        uint16_t ident;
        uint16_t frags;
        uint8_t  ttl;
        uint8_t  protocol;
        uint16_t chksum;
        struct in_addr src;
        struct in_addr dest;
} __attribute__ (( packed ));

/** An IPv4 pseudo header */
struct ipv4_pseudo_header {
        struct in_addr src;
        struct in_addr dest;
        uint8_t zero_padding;
        uint8_t protocol;
        uint16_t len;
};

/** An IPv4 address/routing table entry */
struct ipv4_miniroute {
        /** List of miniroutes */
        struct list_head list;

        /** Network device */
        struct net_device *netdev;

        /** IPv4 address */
        struct in_addr address;
        /** Subnet mask */
        struct in_addr netmask;
        /** Gateway address */
        struct in_addr gateway;
};

/* Fragment reassembly buffer */
struct frag_buffer {
        /* Identification number */
        uint16_t ident;
        /* Source network address */
        struct in_addr src;
        /* Destination network address */
        struct in_addr dest;
        /* Reassembled I/O buffer */
        struct io_buffer *frag_iob;
        /* Reassembly timer */
        struct retry_timer frag_timer;
        /* List of fragment reassembly buffers */
        struct list_head list;
};

extern struct list_head ipv4_miniroutes;

extern struct net_protocol ipv4_protocol;

#endif /* _GPXE_IP_H */