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 #include <linux/rculist_nulls.h> 20 #include <linux/hash.h> 21 #include <linux/jhash.h> 22 23 #include <linux/atomic.h> 24 25 struct net_device; 26 struct packet_type; 27 struct sk_buff; 28 29 struct llc_addr { 30 unsigned char lsap; 31 unsigned char mac[IFHWADDRLEN]; 32 }; 33 34 #define LLC_SAP_STATE_INACTIVE 1 35 #define LLC_SAP_STATE_ACTIVE 2 36 37 #define LLC_SK_DEV_HASH_BITS 6 38 #define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS) 39 40 #define LLC_SK_LADDR_HASH_BITS 6 41 #define LLC_SK_LADDR_HASH_ENTRIES (1<<LLC_SK_LADDR_HASH_BITS) 42 43 /** 44 * struct llc_sap - Defines the SAP component 45 * 46 * @station - station this sap belongs to 47 * @state - sap state 48 * @p_bit - only lowest-order bit used 49 * @f_bit - only lowest-order bit used 50 * @laddr - SAP value in this 'lsap' 51 * @node - entry in station sap_list 52 * @sk_list - LLC sockets this one manages 53 */ 54 struct llc_sap { 55 unsigned char state; 56 unsigned char p_bit; 57 unsigned char f_bit; 58 refcount_t refcnt; 59 int (*rcv_func)(struct sk_buff *skb, 60 struct net_device *dev, 61 struct packet_type *pt, 62 struct net_device *orig_dev); 63 struct llc_addr laddr; 64 struct list_head node; 65 spinlock_t sk_lock; 66 int sk_count; 67 struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES]; 68 struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES]; 69 struct rcu_head rcu; 70 }; 71 72 static inline 73 struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex) 74 { 75 return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES]; 76 } 77 78 static inline 79 u32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr) 80 { 81 return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0), 82 LLC_SK_LADDR_HASH_BITS); 83 } 84 85 static inline 86 struct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap, 87 const struct llc_addr *laddr) 88 { 89 return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)]; 90 } 91 92 #define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */ 93 #define LLC_DEST_SAP 1 /* Type 1 goes here */ 94 #define LLC_DEST_CONN 2 /* Type 2 goes here */ 95 96 extern struct list_head llc_sap_list; 97 98 int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 99 struct net_device *orig_dev); 100 101 int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, 102 const unsigned char *da); 103 104 void llc_add_pack(int type, 105 void (*handler)(struct llc_sap *sap, struct sk_buff *skb)); 106 void llc_remove_pack(int type); 107 108 void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); 109 110 struct llc_sap *llc_sap_open(unsigned char lsap, 111 int (*rcv)(struct sk_buff *skb, 112 struct net_device *dev, 113 struct packet_type *pt, 114 struct net_device *orig_dev)); 115 static inline void llc_sap_hold(struct llc_sap *sap) 116 { 117 refcount_inc(&sap->refcnt); 118 } 119 120 static inline bool llc_sap_hold_safe(struct llc_sap *sap) 121 { 122 return refcount_inc_not_zero(&sap->refcnt); 123 } 124 125 void llc_sap_close(struct llc_sap *sap); 126 127 static inline void llc_sap_put(struct llc_sap *sap) 128 { 129 if (refcount_dec_and_test(&sap->refcnt)) 130 llc_sap_close(sap); 131 } 132 133 struct llc_sap *llc_sap_find(unsigned char sap_value); 134 135 int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, 136 unsigned char *dmac, unsigned char dsap); 137 138 void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); 139 void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); 140 141 void llc_station_init(void); 142 void llc_station_exit(void); 143 144 #ifdef CONFIG_PROC_FS 145 int llc_proc_init(void); 146 void llc_proc_exit(void); 147 #else 148 #define llc_proc_init() (0) 149 #define llc_proc_exit() do { } while(0) 150 #endif /* CONFIG_PROC_FS */ 151 #ifdef CONFIG_SYSCTL 152 int llc_sysctl_init(void); 153 void llc_sysctl_exit(void); 154 155 extern int sysctl_llc2_ack_timeout; 156 extern int sysctl_llc2_busy_timeout; 157 extern int sysctl_llc2_p_timeout; 158 extern int sysctl_llc2_rej_timeout; 159 #else 160 #define llc_sysctl_init() (0) 161 #define llc_sysctl_exit() do { } while(0) 162 #endif /* CONFIG_SYSCTL */ 163 #endif /* LLC_H */ 164