ether.h

/* -*- mode: c; c-basic-offset: 4 -*- */
#ifndef CLICKNET_ETHER_H
#define CLICKNET_ETHER_H
 
/*
 * <clicknet/ether.h> -- Ethernet and ARP headers, based on one of the BSDs.
 *
 * Relevant RFCs include:
 *   RFC826     Ethernet Address Resolution Protocol: or, Converting Network
 *              Protocol Addresses to 48.bit Ethernet Address for Transmission
 *              on Ethernet Hardware
 *   RFC894     Standard for the transmission of IP datagrams over Ethernet
 *              networks
 * Also see the relevant IEEE 802 standards.
 */
 
struct click_ether {
    uint8_t     ether_dhost[6];         /* 0-5   Ethernet destination address */
    uint8_t     ether_shost[6];         /* 6-11  Ethernet source address      */
    uint16_t    ether_type;             /* 12-13 Ethernet protocol            */
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
#define ETHERTYPE_IP            0x0800
#define ETHERTYPE_ARP           0x0806
#define ETHERTYPE_TRAIL         0x1000
#define ETHERTYPE_8021Q         0x8100
#define ETHERTYPE_IP6           0x86DD
#define ETHERTYPE_MACCONTROL    0x8808
#define ETHERTYPE_PPPOE_DISC    0x8863
#define ETHERTYPE_PPPOE_SESSION 0x8864
#define ETHERTYPE_GRID          0x7fff  /* wvlan_cs driver won't transmit frames with high bit of protocol number set */
 
struct click_arp {              /* Offsets relative to ARP (Ethernet) header */
    uint16_t    ar_hrd;         /* 0-1 (14-15)  hardware address format      */
#define ARPHRD_ETHER    1       /*                Ethernet 10Mbps            */
#define ARPHRD_IEEE802  6       /*                token ring                 */
#define ARPHRD_ARCNET   7       /*                Arcnet                     */
#define ARPHRD_FRELAY   15      /*                frame relay                */
#define ARPHRD_STRIP    23      /*                Ricochet Starmode Radio    */
#define ARPHRD_IEEE1394 24      /*                IEEE 1394 (FireWire)       */
#define ARPHRD_80211    801     /*                IEEE 802.11 (wifi)         */
    uint16_t    ar_pro;         /* 2-3 (16-17)  protocol address format      */
    uint8_t     ar_hln;         /* 4   (18)     hardware address length      */
    uint8_t     ar_pln;         /* 5   (19)     protocol address length      */
    uint16_t    ar_op;          /* 6-7 (20-21)  opcode (command)             */
#define ARPOP_REQUEST   1       /*                ARP request                */
#define ARPOP_REPLY     2       /*                ARP reply                  */
#define ARPOP_REVREQUEST 3      /*                reverse request: hw->proto */
#define ARPOP_REVREPLY  4       /*                reverse reply              */
#define ARPOP_INVREQUEST 8      /*                peer identification req    */
#define ARPOP_INVREPLY  9       /*                peer identification reply  */
};
 
struct click_ether_arp {
    struct click_arp ea_hdr;    /* 0-7   (14-21)  fixed-size ARP header      */
    uint8_t     arp_sha[6];     /* 8-13  (22-27)  sender hardware address    */
    uint8_t     arp_spa[4];     /* 14-17 (28-31)  sender protocol address    */
    uint8_t     arp_tha[6];     /* 18-23 (32-37)  target hardware address    */
    uint8_t     arp_tpa[4];     /* 24-27 (38-41)  target protocol address    */
};
 
 
/* Ethernet with VLAN (802.1q) */
 
struct click_ether_vlan {
    uint8_t     ether_dhost[6];         /* 0-5   Ethernet source address      */
    uint8_t     ether_shost[6];         /* 6-11  Ethernet destination address */
    uint16_t    ether_vlan_proto;       /* 12-13 == ETHERTYPE_8021Q           */
    uint16_t    ether_vlan_tci;         /* 14-15 tag control information      */
    uint16_t    ether_vlan_encap_proto; /* 16-17 Ethernet protocol            */
} CLICK_SIZE_PACKED_ATTRIBUTE;
 
 
/* Ethernet MAC control (802.3) */
 
struct click_ether_macctl {
    uint16_t    ether_macctl_opcode;
    uint16_t    ether_macctl_param;
    uint8_t     ether_macctl_reserved[42];
};
 
#define ETHER_MACCTL_OP_PAUSE   0x0001
 
 
#define ND_SOL 0x0087       /* Neighborhood Solicitation Message Type */
#define ND_ADV 0x0088       /* Neighborhood Advertisement Message Type */
 
/* define structure of Neighborhood Solicitation Message */
struct click_nd_sol {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    uint32_t reserved;
    uint8_t nd_tpa[16];
    uint8_t option_type;   /*option type: 1 (source link-layer add) */
    uint8_t option_length; /*option length: 1 (in units of 8 octets) */
    uint8_t nd_sha[6];    /*source link-layer address */
};
 
/* define structure of Neighborhood Advertisement Message -reply to multicast neighborhood solitation message */
struct click_nd_adv {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    uint8_t flags; /* bit 1: sender_is_router
                      bit 2: solicited
                      bit 3: override
                      all other bits should be zero */
    uint8_t reserved[3];
    uint8_t nd_tpa[16];
    uint8_t option_type;    /* option type: 2 (target link-layer add) */
    uint8_t option_length;  /* option length: 1 (in units of 8 octets) */
    uint8_t nd_tha[6];     /* source link-layer address */
};
 
 
/* define structure of Neighborhood Advertisement Message - reply to unicast neighborhood solitation message */
struct click_nd_adv2 {
    uint8_t type;
    uint8_t code;
    uint16_t checksum;
    uint8_t flags; /* bit 1: sender_is_router
                      bit 2: solicited
                      bit 3: override
                      all other bits should be zero */
    uint8_t reserved[3];
    uint8_t nd_tpa[16];
};
 
#endif