net/atm/lec_arpc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Lec arp cache
   4  *
   5  * Marko Kiiskila <mkiiskila@yahoo.com>
   6  */
   7 #ifndef _LEC_ARP_H_
   8 #define _LEC_ARP_H_
   9 #include <linux/atm.h>
  10 #include <linux/atmdev.h>
  11 #include <linux/if_ether.h>
  12 #include <linux/atmlec.h>
  13
  14 struct lec_arp_table {
  15         struct hlist_node next;         /* Linked entry list */
  16         unsigned char atm_addr[ATM_ESA_LEN];    /* Atm address */
  17         unsigned char mac_addr[ETH_ALEN];       /* Mac address */
  18         int is_rdesc;                   /* Mac address is a route descriptor */
  19         struct atm_vcc *vcc;            /* Vcc this entry is attached */
  20         struct atm_vcc *recv_vcc;       /* Vcc we receive data from */
  21
  22         void (*old_push) (struct atm_vcc *vcc, struct sk_buff *skb);
  23                                         /* Push that leads to daemon */
  24
  25         void (*old_recv_push) (struct atm_vcc *vcc, struct sk_buff *skb);
  26                                         /* Push that leads to daemon */
  27
  28         unsigned long last_used;        /* For expiry */
  29         unsigned long timestamp;        /* Used for various timestamping things:
  30                                          * 1. FLUSH started
  31                                          *    (status=ESI_FLUSH_PENDING)
  32                                          * 2. Counting to
  33                                          *    max_unknown_frame_time
  34                                          *    (status=ESI_ARP_PENDING||
  35                                          *     status=ESI_VC_PENDING)
  36                                          */
  37         unsigned char no_tries;         /* No of times arp retry has been tried */
  38         unsigned char status;           /* Status of this entry */
  39         unsigned short flags;           /* Flags for this entry */
  40         unsigned short packets_flooded; /* Data packets flooded */
  41         unsigned long flush_tran_id;    /* Transaction id in flush protocol */
  42         struct timer_list timer;        /* Arping timer */
  43         struct lec_priv *priv;          /* Pointer back */
  44         u8 *tlvs;
  45         u32 sizeoftlvs;                 /*
  46                                          * LANE2: Each MAC address can have TLVs
  47                                          * associated with it.  sizeoftlvs tells
  48                                          * the length of the tlvs array
  49                                          */
  50         struct sk_buff_head tx_wait;    /* wait queue for outgoing packets */
  51         refcount_t usage;               /* usage count */
  52 };
  53
  54 /*
  55  * LANE2: Template tlv struct for accessing
  56  * the tlvs in the lec_arp_table->tlvs array
  57  */
  58 struct tlv {
  59         u32 type;
  60         u8 length;
  61         u8 value[255];
  62 };
  63
  64 /* Status fields */
  65 #define ESI_UNKNOWN 0           /*
  66                                  * Next packet sent to this mac address
  67                                  * causes ARP-request to be sent
  68                                  */
  69 #define ESI_ARP_PENDING 1       /*
  70                                  * There is no ATM address associated with this
  71                                  * 48-bit address.  The LE-ARP protocol is in
  72                                  * progress.
  73                                  */
  74 #define ESI_VC_PENDING 2        /*
  75                                  * There is a valid ATM address associated with
  76                                  * this 48-bit address but there is no VC set
  77                                  * up to that ATM address.  The signaling
  78                                  * protocol is in process.
  79                                  */
  80 #define ESI_FLUSH_PENDING 4     /*
  81                                  * The LEC has been notified of the FLUSH_START
  82                                  * status and it is assumed that the flush
  83                                  * protocol is in process.
  84                                  */
  85 #define ESI_FORWARD_DIRECT 5    /*
  86                                  * Either the Path Switching Delay (C22) has
  87                                  * elapsed or the LEC has notified the Mapping
  88                                  * that the flush protocol has completed.  In
  89                                  * either case, it is safe to forward packets
  90                                  * to this address via the data direct VC.
  91                                  */
  92
  93 /* Flag values */
  94 #define LEC_REMOTE_FLAG      0x0001
  95 #define LEC_PERMANENT_FLAG   0x0002
  96
  97 #endif /* _LEC_ARP_H_ */