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 struct net_device;
  21 struct packet_type;
  22 struct sk_buff;
  23
  24 struct llc_addr {
  25         unsigned char lsap;
  26         unsigned char mac[IFHWADDRLEN];
  27 };
  28
  29 #define LLC_SAP_STATE_INACTIVE  1
  30 #define LLC_SAP_STATE_ACTIVE    2
  31
  32 /**
  33  * struct llc_sap - Defines the SAP component
  34  *
  35  * @station - station this sap belongs to
  36  * @state - sap state
  37  * @p_bit - only lowest-order bit used
  38  * @f_bit - only lowest-order bit used
  39  * @laddr - SAP value in this 'lsap'
  40  * @node - entry in station sap_list
  41  * @sk_list - LLC sockets this one manages
  42  */
  43 struct llc_sap {
  44         unsigned char    state;
  45         unsigned char    p_bit;
  46         unsigned char    f_bit;
  47         int              (*rcv_func)(struct sk_buff *skb,
  48                                      struct net_device *dev,
  49                                      struct packet_type *pt,
  50                                      struct net_device *orig_dev);
  51         struct llc_addr  laddr;
  52         struct list_head node;
  53         struct {
  54                 rwlock_t          lock;
  55                 struct hlist_head list;
  56         } sk_list;
  57 };
  58
  59 #define LLC_DEST_INVALID         0      /* Invalid LLC PDU type */
  60 #define LLC_DEST_SAP             1      /* Type 1 goes here */
  61 #define LLC_DEST_CONN            2      /* Type 2 goes here */
  62
  63 extern struct list_head llc_sap_list;
  64 extern rwlock_t llc_sap_list_lock;
  65 extern unsigned char llc_station_mac_sa[ETH_ALEN];
  66
  67 extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
  68                    struct packet_type *pt, struct net_device *orig_dev);
  69
  70 extern int llc_mac_hdr_init(struct sk_buff *skb,
  71                             unsigned char *sa, unsigned char *da);
  72
  73 extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
  74                                                    struct sk_buff *skb));
  75 extern void llc_remove_pack(int type);
  76
  77 extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
  78
  79 extern struct llc_sap *llc_sap_open(unsigned char lsap,
  80                                     int (*rcv)(struct sk_buff *skb,
  81                                                struct net_device *dev,
  82                                                struct packet_type *pt,
  83                                                struct net_device *orig_dev));
  84 extern void llc_sap_close(struct llc_sap *sap);
  85
  86 extern struct llc_sap *llc_sap_find(unsigned char sap_value);
  87
  88 extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
  89                                      unsigned char *dmac, unsigned char dsap);
  90
  91 extern int llc_station_init(void);
  92 extern void llc_station_exit(void);
  93
  94 #ifdef CONFIG_PROC_FS
  95 extern int llc_proc_init(void);
  96 extern void llc_proc_exit(void);
  97 #else
  98 #define llc_proc_init() (0)
  99 #define llc_proc_exit() do { } while(0)
 100 #endif /* CONFIG_PROC_FS */
 101 #endif /* LLC_H */