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
  22 struct net_device;
  23 struct packet_type;
  24 struct sk_buff;
  25
  26 struct 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  */
  45 struct 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
  66 extern struct list_head llc_sap_list;
  67 extern rwlock_t llc_sap_list_lock;
  68 extern unsigned char llc_station_mac_sa[ETH_ALEN];
  69
  70 extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
  71                    struct packet_type *pt, struct net_device *orig_dev);
  72
  73 extern int llc_mac_hdr_init(struct sk_buff *skb,
  74                             const unsigned char *sa, const unsigned char *da);
  75
  76 extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
  77                                                    struct sk_buff *skb));
  78 extern void llc_remove_pack(int type);
  79
  80 extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
  81
  82 extern struct llc_sap *llc_sap_open(unsigned char lsap,
  83                                     int (*rcv)(struct sk_buff *skb,
  84                                                struct net_device *dev,
  85                                                struct packet_type *pt,
  86                                                struct net_device *orig_dev));
  87 static inline void llc_sap_hold(struct llc_sap *sap)
  88 {
  89         atomic_inc(&sap->refcnt);
  90 }
  91
  92 extern void llc_sap_close(struct llc_sap *sap);
  93
  94 static inline void llc_sap_put(struct llc_sap *sap)
  95 {
  96         if (atomic_dec_and_test(&sap->refcnt))
  97                 llc_sap_close(sap);
  98 }
  99
 100 extern struct llc_sap *llc_sap_find(unsigned char sap_value);
 101
 102 extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
 103                                      unsigned char *dmac, unsigned char dsap);
 104
 105 extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
 106 extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
 107
 108 extern int llc_station_init(void);
 109 extern void llc_station_exit(void);
 110
 111 #ifdef CONFIG_PROC_FS
 112 extern int llc_proc_init(void);
 113 extern void llc_proc_exit(void);
 114 #else
 115 #define llc_proc_init() (0)
 116 #define llc_proc_exit() do { } while(0)
 117 #endif /* CONFIG_PROC_FS */
 118 #ifdef CONFIG_SYSCTL
 119 extern int llc_sysctl_init(void);
 120 extern void llc_sysctl_exit(void);
 121
 122 extern int sysctl_llc2_ack_timeout;
 123 extern int sysctl_llc2_busy_timeout;
 124 extern int sysctl_llc2_p_timeout;
 125 extern int sysctl_llc2_rej_timeout;
 126 extern int sysctl_llc_station_ack_timeout;
 127 #else
 128 #define llc_sysctl_init() (0)
 129 #define llc_sysctl_exit() do { } while(0)
 130 #endif /* CONFIG_SYSCTL */
 131 #endif /* LLC_H */