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 69 extern int llc_rcv(struct sk_buff *skb, struct net_device *dev, 70 struct packet_type *pt, struct net_device *orig_dev); 71 72 extern int llc_mac_hdr_init(struct sk_buff *skb, 73 const unsigned char *sa, const unsigned char *da); 74 75 extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap, 76 struct sk_buff *skb)); 77 extern void llc_remove_pack(int type); 78 79 extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); 80 81 extern 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)); 86 static inline void llc_sap_hold(struct llc_sap *sap) 87 { 88 atomic_inc(&sap->refcnt); 89 } 90 91 extern void llc_sap_close(struct llc_sap *sap); 92 93 static 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 99 extern struct llc_sap *llc_sap_find(unsigned char sap_value); 100 101 extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, 102 unsigned char *dmac, unsigned char dsap); 103 104 extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); 105 extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); 106 107 extern int llc_station_init(void); 108 extern void llc_station_exit(void); 109 110 #ifdef CONFIG_PROC_FS 111 extern int llc_proc_init(void); 112 extern 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 118 extern int llc_sysctl_init(void); 119 extern void llc_sysctl_exit(void); 120 121 extern int sysctl_llc2_ack_timeout; 122 extern int sysctl_llc2_busy_timeout; 123 extern int sysctl_llc2_p_timeout; 124 extern int sysctl_llc2_rej_timeout; 125 extern 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