LXR linux/include/net/llc.h

   1#ifndef LLC_H
   2#define LLC_H
   3/*
   4 * Copyright (c) 1997 by Procom Technology, Inc.
   5 *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   6 *
   7 * This program can be redistributed or modified under the terms of the
   8 * GNU General Public License as published by the Free Software Foundation.
   9 * This program is distributed without any warranty or implied warranty
  10 * of merchantability or fitness for a particular purpose.
  11 *
  12 * See the GNU General Public License for more details.
  13 */
  14
  15#include <linux/if.h>
  16#include <linux/if_ether.h>
  17#include <linux/list.h>
  18#include <linux/spinlock.h>
  19
  20#include <asm/atomic.h>
  21
  22struct net_device;
  23struct packet_type;
  24struct sk_buff;
  25
  26struct llc_addr {
  27        unsigned char lsap;
  28        unsigned char mac[IFHWADDRLEN];
  29};
  30
  31#define LLC_SAP_STATE_INACTIVE  1
  32#define LLC_SAP_STATE_ACTIVE    2
  33
  34/**
  35 * struct llc_sap - Defines the SAP component
  36 *
  37 * @station - station this sap belongs to
  38 * @state - sap state
  39 * @p_bit - only lowest-order bit used
  40 * @f_bit - only lowest-order bit used
  41 * @laddr - SAP value in this 'lsap'
  42 * @node - entry in station sap_list
  43 * @sk_list - LLC sockets this one manages
  44 */
  45struct llc_sap {
  46        unsigned char    state;
  47        unsigned char    p_bit;
  48        unsigned char    f_bit;
  49        atomic_t         refcnt;
  50        int              (*rcv_func)(struct sk_buff *skb,
  51                                     struct net_device *dev,
  52                                     struct packet_type *pt,
  53                                     struct net_device *orig_dev);
  54        struct llc_addr  laddr;
  55        struct list_head node;
  56        struct {
  57                rwlock_t          lock;
  58                struct hlist_head list;
  59        } sk_list;
  60};
  61
  62#define LLC_DEST_INVALID         0      /* Invalid LLC PDU type */
  63#define LLC_DEST_SAP             1      /* Type 1 goes here */
  64#define LLC_DEST_CONN            2      /* Type 2 goes here */
  65
  66extern struct list_head llc_sap_list;
  67extern rwlock_t llc_sap_list_lock;
  68
  69extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
  70                   struct packet_type *pt, struct net_device *orig_dev);
  71
  72extern int llc_mac_hdr_init(struct sk_buff *skb,
  73                            const unsigned char *sa, const unsigned char *da);
  74
  75extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
  76                                                   struct sk_buff *skb));
  77extern void llc_remove_pack(int type);
  78
  79extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
  80
  81extern struct llc_sap *llc_sap_open(unsigned char lsap,
  82                                    int (*rcv)(struct sk_buff *skb,
  83                                               struct net_device *dev,
  84                                               struct packet_type *pt,
  85                                               struct net_device *orig_dev));
  86static inline void llc_sap_hold(struct llc_sap *sap)
  87{
  88        atomic_inc(&sap->refcnt);
  89}
  90
  91extern void llc_sap_close(struct llc_sap *sap);
  92
  93static inline void llc_sap_put(struct llc_sap *sap)
  94{
  95        if (atomic_dec_and_test(&sap->refcnt))
  96                llc_sap_close(sap);
  97}
  98
  99extern struct llc_sap *llc_sap_find(unsigned char sap_value);
 100
 101extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
 102                                     unsigned char *dmac, unsigned char dsap);
 103
 104extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
 105extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
 106
 107extern int llc_station_init(void);
 108extern void llc_station_exit(void);
 109
 110#ifdef CONFIG_PROC_FS
 111extern int llc_proc_init(void);
 112extern void llc_proc_exit(void);
 113#else
 114#define llc_proc_init() (0)
 115#define llc_proc_exit() do { } while(0)
 116#endif /* CONFIG_PROC_FS */
 117#ifdef CONFIG_SYSCTL
 118extern int llc_sysctl_init(void);
 119extern void llc_sysctl_exit(void);
 120
 121extern int sysctl_llc2_ack_timeout;
 122extern int sysctl_llc2_busy_timeout;
 123extern int sysctl_llc2_p_timeout;
 124extern int sysctl_llc2_rej_timeout;
 125extern int sysctl_llc_station_ack_timeout;
 126#else
 127#define llc_sysctl_init() (0)
 128#define llc_sysctl_exit() do { } while(0)
 129#endif /* CONFIG_SYSCTL */
 130#endif /* LLC_H */
 131