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* Lan Emulation client header file
* Marko Kiiskila <>
#ifndef _LEC_H_
#define _LEC_H_
#include <linux/atmdev.h>
#include <linux/netdevice.h>
#include <linux/atmlec.h>
#define LEC_HEADER_LEN 16
struct lecdatahdr_8023 {
__be16 le_header;
unsigned char h_dest[ETH_ALEN];
unsigned char h_source[ETH_ALEN];
__be16 h_type;
struct lecdatahdr_8025 {
__be16 le_header;
unsigned char ac_pad;
unsigned char fc;
unsigned char h_dest[ETH_ALEN];
unsigned char h_source[ETH_ALEN];
#define LEC_MINIMUM_8023_SIZE 62
#define LEC_MINIMUM_8025_SIZE 16
* Operations that LANE2 capable device can do. Two first functions
* are used to make the device do things. See spec 3.1.3 and 3.1.4.
* The third function is intended for the MPOA component sitting on
* top of the LANE device. The MPOA component assigns it's own function
* to (*associate_indicator)() and the LANE device will use that
* function to tell about TLVs it sees floating through.
struct lane2_ops {
int (*resolve) (struct net_device *dev, const u8 *dst_mac, int force,
u8 **tlvs, u32 *sizeoftlvs);
int (*associate_req) (struct net_device *dev, const u8 *lan_dst,
const u8 *tlvs, u32 sizeoftlvs);
void (*associate_indicator) (struct net_device *dev, const u8 *mac_addr,
const u8 *tlvs, u32 sizeoftlvs);
* ATM LAN Emulation supports both LLC & Dix Ethernet EtherType
* frames.
* 1. Dix Ethernet EtherType frames encoded by placing EtherType
* field in h_type field. Data follows immediatelly after header.
* 2. LLC Data frames whose total length, including LLC field and data,
* but not padding required to meet the minimum data frame length,
* is less than 1536(0x0600) MUST be encoded by placing that length
* in the h_type field. The LLC field follows header immediatelly.
* 3. LLC data frames longer than this maximum MUST be encoded by placing
* the value 0 in the h_type field.
/* Hash table size */
struct lec_priv {
unsigned short lecid; /* Lecid of this client */
struct hlist_head lec_arp_empty_ones;
/* Used for storing VCC's that don't have a MAC address attached yet */
struct hlist_head lec_arp_tables[LEC_ARP_TABLE_SIZE];
/* Actual LE ARP table */
struct hlist_head lec_no_forward;
* Used for storing VCC's (and forward packets from) which are to
* age out by not using them to forward packets.
* This is because to some LE clients there will be 2 VCCs. Only
* one of them gets used.
struct hlist_head mcast_fwds;
* With LANEv2 it is possible that BUS (or a special multicast server)
* establishes multiple Multicast Forward VCCs to us. This list
* collects all those VCCs. LANEv1 client has only one item in this
* list. These entries are not aged out.
spinlock_t lec_arp_lock;
struct atm_vcc *mcast_vcc; /* Default Multicast Send VCC */
struct atm_vcc *lecd;
struct delayed_work lec_arp_work; /* C10 */
unsigned int maximum_unknown_frame_count;
* Within the period of time defined by this variable, the client will send
* no more than C10 frames to BUS for a given unicast destination. (C11)
unsigned long max_unknown_frame_time;
* If no traffic has been sent in this vcc for this period of time,
* vcc will be torn down (C12)
unsigned long vcc_timeout_period;
* An LE Client MUST not retry an LE_ARP_REQUEST for a
* given frame's LAN Destination more than maximum retry count times,
* after the first LEC_ARP_REQUEST (C13)
unsigned short max_retry_count;
* Max time the client will maintain an entry in its arp cache in
* absence of a verification of that relationship (C17)
unsigned long aging_time;
* Max time the client will maintain an entry in cache when
* topology change flag is true (C18)
unsigned long forward_delay_time; /* Topology change flag (C19) */
int topology_change;
* Max time the client expects an LE_ARP_REQUEST/LE_ARP_RESPONSE
* cycle to take (C20)
unsigned long arp_response_time;
* Time limit ot wait to receive an LE_FLUSH_RESPONSE after the
* LE_FLUSH_REQUEST has been sent before taking recover action. (C21)
unsigned long flush_timeout;
/* The time since sending a frame to the bus after which the
* LE Client may assume that the frame has been either discarded or
* delivered to the recipient (C22)
unsigned long path_switching_delay;
u8 *tlvs; /* LANE2: TLVs are new */
u32 sizeoftlvs; /* The size of the tlv array in bytes */
int lane_version; /* LANE2 */
int itfnum; /* e.g. 2 for lec2, 5 for lec5 */
struct lane2_ops *lane2_ops; /* can be NULL for LANE v1 */
int is_proxy; /* bridge between ATM and Ethernet */
int is_trdev; /* Device type, 0 = Ethernet, 1 = TokenRing */
struct lec_vcc_priv {
void (*old_pop) (struct atm_vcc *vcc, struct sk_buff *skb);
int xoff;
#define LEC_VCC_PRIV(vcc) ((struct lec_vcc_priv *)((vcc)->user_back))
#endif /* _LEC_H_ */
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