llc.h (4520B)
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 25struct net_device; 26struct packet_type; 27struct sk_buff; 28 29struct 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 */ 54struct 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 72static inline 73struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex) 74{ 75 u32 bucket = hash_32(ifindex, LLC_SK_DEV_HASH_BITS); 76 77 return &sap->sk_dev_hash[bucket]; 78} 79 80static inline 81u32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr) 82{ 83 return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0), 84 LLC_SK_LADDR_HASH_BITS); 85} 86 87static inline 88struct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap, 89 const struct llc_addr *laddr) 90{ 91 return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)]; 92} 93 94#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */ 95#define LLC_DEST_SAP 1 /* Type 1 goes here */ 96#define LLC_DEST_CONN 2 /* Type 2 goes here */ 97 98extern struct list_head llc_sap_list; 99 100int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 101 struct net_device *orig_dev); 102 103int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, 104 const unsigned char *da); 105 106void llc_add_pack(int type, 107 void (*handler)(struct llc_sap *sap, struct sk_buff *skb)); 108void llc_remove_pack(int type); 109 110void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); 111 112struct llc_sap *llc_sap_open(unsigned char lsap, 113 int (*rcv)(struct sk_buff *skb, 114 struct net_device *dev, 115 struct packet_type *pt, 116 struct net_device *orig_dev)); 117static inline void llc_sap_hold(struct llc_sap *sap) 118{ 119 refcount_inc(&sap->refcnt); 120} 121 122static inline bool llc_sap_hold_safe(struct llc_sap *sap) 123{ 124 return refcount_inc_not_zero(&sap->refcnt); 125} 126 127void llc_sap_close(struct llc_sap *sap); 128 129static inline void llc_sap_put(struct llc_sap *sap) 130{ 131 if (refcount_dec_and_test(&sap->refcnt)) 132 llc_sap_close(sap); 133} 134 135struct llc_sap *llc_sap_find(unsigned char sap_value); 136 137int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, 138 const unsigned char *dmac, unsigned char dsap); 139 140void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); 141void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); 142 143void llc_station_init(void); 144void llc_station_exit(void); 145 146#ifdef CONFIG_PROC_FS 147int llc_proc_init(void); 148void llc_proc_exit(void); 149#else 150#define llc_proc_init() (0) 151#define llc_proc_exit() do { } while(0) 152#endif /* CONFIG_PROC_FS */ 153#ifdef CONFIG_SYSCTL 154int llc_sysctl_init(void); 155void llc_sysctl_exit(void); 156 157extern int sysctl_llc2_ack_timeout; 158extern int sysctl_llc2_busy_timeout; 159extern int sysctl_llc2_p_timeout; 160extern int sysctl_llc2_rej_timeout; 161#else 162#define llc_sysctl_init() (0) 163#define llc_sysctl_exit() do { } while(0) 164#endif /* CONFIG_SYSCTL */ 165#endif /* LLC_H */