lec_arpc.h

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/*
 * Lec arp cache
 *
 * Marko Kiiskila <[email protected]>
 */
#ifndef _LEC_ARP_H_
#define _LEC_ARP_H_
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/if_ether.h>
#include <linux/atmlec.h>

struct lec_arp_table {
    struct hlist_node next;     /* Linked entry list */
    unsigned char atm_addr[ATM_ESA_LEN];    /* Atm address */
    unsigned char mac_addr[ETH_ALEN];   /* Mac address */
    int is_rdesc;           /* Mac address is a route descriptor */
    struct atm_vcc *vcc;        /* Vcc this entry is attached */
    struct atm_vcc *recv_vcc;   /* Vcc we receive data from */

    void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb);
                    /* Push that leads to daemon */

    void (*old_recv_push) (struct atm_vcc *vcc, struct sk_buff *skb);
                    /* Push that leads to daemon */

    unsigned long last_used;    /* For expiry */
    unsigned long timestamp;    /* Used for various timestamping things:
                     * 1. FLUSH started
                     *    (status=ESI_FLUSH_PENDING)
                     * 2. Counting to
                     *    max_unknown_frame_time
                     *    (status=ESI_ARP_PENDING||
                     *     status=ESI_VC_PENDING)
                     */
    unsigned char no_tries;     /* No of times arp retry has been tried */
    unsigned char status;       /* Status of this entry */
    unsigned short flags;       /* Flags for this entry */
    unsigned short packets_flooded; /* Data packets flooded */
    unsigned long flush_tran_id;    /* Transaction id in flush protocol */
    struct timer_list timer;    /* Arping timer */
    struct lec_priv *priv;      /* Pointer back */
    u8 *tlvs;
    u32 sizeoftlvs;         /*
                     * LANE2: Each MAC address can have TLVs
                     * associated with it.  sizeoftlvs tells the
                     * the length of the tlvs array
                     */
    struct sk_buff_head tx_wait;    /* wait queue for outgoing packets */
    atomic_t usage;         /* usage count */
};

/*
 * LANE2: Template tlv struct for accessing
 * the tlvs in the lec_arp_table->tlvs array
 */
struct tlv {
    u32 type;
    u8 length;
    u8 value[255];
};

/* Status fields */
#define ESI_UNKNOWN 0       /*
                 * Next packet sent to this mac address
                 * causes ARP-request to be sent
                 */
#define ESI_ARP_PENDING 1   /*
                 * There is no ATM address associated with this
                 * 48-bit address.  The LE-ARP protocol is in
                 * progress.
                 */
#define ESI_VC_PENDING 2    /*
                 * There is a valid ATM address associated with
                 * this 48-bit address but there is no VC set
                 * up to that ATM address.  The signaling
                 * protocol is in process.
                 */
#define ESI_FLUSH_PENDING 4 /*
                 * The LEC has been notified of the FLUSH_START
                 * status and it is assumed that the flush
                 * protocol is in process.
                 */
#define ESI_FORWARD_DIRECT 5    /*
                 * Either the Path Switching Delay (C22) has
                 * elapsed or the LEC has notified the Mapping
                 * that the flush protocol has completed.  In
                 * either case, it is safe to forward packets
                 * to this address via the data direct VC.
                 */

/* Flag values */
#define LEC_REMOTE_FLAG      0x0001
#define LEC_PERMANENT_FLAG   0x0002

#endif /* _LEC_ARP_H_ */