net/atm/lec_arpc.h

   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
  13 struct 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  */
  57 struct 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_ */