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