LXR linux/net/atm/lec

   1/*
   2 * Lec arp cache
   3 *
   4 * Marko Kiiskila <mkiiskila@yahoo.com>
   5 */
   6#ifndef _LEC_ARP_H_
   7#define _LEC_ARP_H_
   8#include <linux/atm.h>
   9#include <linux/atmdev.h>
  10#include <linux/if_ether.h>
  11#include <linux/atmlec.h>
  12
  13struct lec_arp_table {
  14        struct hlist_node next;         /* Linked entry list */
  15        unsigned char atm_addr[ATM_ESA_LEN];    /* Atm address */
  16        unsigned char mac_addr[ETH_ALEN];       /* Mac address */
  17        int is_rdesc;                   /* Mac address is a route descriptor */
  18        struct atm_vcc *vcc;            /* Vcc this entry is attached */
  19        struct atm_vcc *recv_vcc;       /* Vcc we receive data from */
  20
  21        void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb);
  22                                        /* Push that leads to daemon */
  23
  24        void (*old_recv_push) (struct atm_vcc *vcc, struct sk_buff *skb);
  25                                        /* Push that leads to daemon */
  26
  27        unsigned long last_used;        /* For expiry */
  28        unsigned long timestamp;        /* Used for various timestamping things:
  29                                         * 1. FLUSH started
  30                                         *    (status=ESI_FLUSH_PENDING)
  31                                         * 2. Counting to
  32                                         *    max_unknown_frame_time
  33                                         *    (status=ESI_ARP_PENDING||
  34                                         *     status=ESI_VC_PENDING)
  35                                         */
  36        unsigned char no_tries;         /* No of times arp retry has been tried */
  37        unsigned char status;           /* Status of this entry */
  38        unsigned short flags;           /* Flags for this entry */
  39        unsigned short packets_flooded; /* Data packets flooded */
  40        unsigned long flush_tran_id;    /* Transaction id in flush protocol */
  41        struct timer_list timer;        /* Arping timer */
  42        struct lec_priv *priv;          /* Pointer back */
  43        u8 *tlvs;
  44        u32 sizeoftlvs;                 /*
  45                                         * LANE2: Each MAC address can have TLVs
  46                                         * associated with it.  sizeoftlvs tells the
  47                                         * the length of the tlvs array
  48                                         */
  49        struct sk_buff_head tx_wait;    /* wait queue for outgoing packets */
  50        atomic_t usage;                 /* usage count */
  51};
  52
  53/*
  54 * LANE2: Template tlv struct for accessing
  55 * the tlvs in the lec_arp_table->tlvs array
  56 */
  57struct tlv {
  58        u32 type;
  59        u8 length;
  60        u8 value[255];
  61};
  62
  63/* Status fields */
  64#define ESI_UNKNOWN 0           /*
  65                                 * Next packet sent to this mac address
  66                                 * causes ARP-request to be sent
  67                                 */
  68#define ESI_ARP_PENDING 1       /*
  69                                 * There is no ATM address associated with this
  70                                 * 48-bit address.  The LE-ARP protocol is in
  71                                 * progress.
  72                                 */
  73#define ESI_VC_PENDING 2        /*
  74                                 * There is a valid ATM address associated with
  75                                 * this 48-bit address but there is no VC set
  76                                 * up to that ATM address.  The signaling
  77                                 * protocol is in process.
  78                                 */
  79#define ESI_FLUSH_PENDING 4     /*
  80                                 * The LEC has been notified of the FLUSH_START
  81                                 * status and it is assumed that the flush
  82                                 * protocol is in process.
  83                                 */
  84#define ESI_FORWARD_DIRECT 5    /*
  85                                 * Either the Path Switching Delay (C22) has
  86                                 * elapsed or the LEC has notified the Mapping
  87                                 * that the flush protocol has completed.  In
  88                                 * either case, it is safe to forward packets
  89                                 * to this address via the data direct VC.
  90                                 */
  91
  92/* Flag values */
  93#define LEC_REMOTE_FLAG      0x0001
  94#define LEC_PERMANENT_FLAG   0x0002
  95
  96#endif /* _LEC_ARP_H_ */
  97