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163 lines
4.4 KiB
163 lines
4.4 KiB
#ifndef LLC_H |
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#define LLC_H |
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/* |
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* Copyright (c) 1997 by Procom Technology, Inc. |
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* 2001-2003 by Arnaldo Carvalho de Melo <[email protected]> |
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* |
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* This program can be redistributed or modified under the terms of the |
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* GNU General Public License as published by the Free Software Foundation. |
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* This program is distributed without any warranty or implied warranty |
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* of merchantability or fitness for a particular purpose. |
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* |
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* See the GNU General Public License for more details. |
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*/ |
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#include <linux/if.h> |
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#include <linux/if_ether.h> |
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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#include <linux/rculist_nulls.h> |
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#include <linux/hash.h> |
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#include <linux/jhash.h> |
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#include <linux/atomic.h> |
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struct net_device; |
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struct packet_type; |
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struct sk_buff; |
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struct llc_addr { |
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unsigned char lsap; |
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unsigned char mac[IFHWADDRLEN]; |
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}; |
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#define LLC_SAP_STATE_INACTIVE 1 |
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#define LLC_SAP_STATE_ACTIVE 2 |
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#define LLC_SK_DEV_HASH_BITS 6 |
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#define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS) |
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#define LLC_SK_LADDR_HASH_BITS 6 |
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#define LLC_SK_LADDR_HASH_ENTRIES (1<<LLC_SK_LADDR_HASH_BITS) |
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/** |
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* struct llc_sap - Defines the SAP component |
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* |
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* @station - station this sap belongs to |
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* @state - sap state |
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* @p_bit - only lowest-order bit used |
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* @f_bit - only lowest-order bit used |
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* @laddr - SAP value in this 'lsap' |
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* @node - entry in station sap_list |
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* @sk_list - LLC sockets this one manages |
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*/ |
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struct llc_sap { |
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unsigned char state; |
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unsigned char p_bit; |
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unsigned char f_bit; |
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refcount_t refcnt; |
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int (*rcv_func)(struct sk_buff *skb, |
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struct net_device *dev, |
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struct packet_type *pt, |
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struct net_device *orig_dev); |
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struct llc_addr laddr; |
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struct list_head node; |
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spinlock_t sk_lock; |
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int sk_count; |
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struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES]; |
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struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES]; |
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struct rcu_head rcu; |
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}; |
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static inline |
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struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex) |
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{ |
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return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES]; |
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} |
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static inline |
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u32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr) |
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{ |
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return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0), |
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LLC_SK_LADDR_HASH_BITS); |
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} |
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static inline |
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struct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap, |
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const struct llc_addr *laddr) |
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{ |
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return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)]; |
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} |
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#define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */ |
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#define LLC_DEST_SAP 1 /* Type 1 goes here */ |
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#define LLC_DEST_CONN 2 /* Type 2 goes here */ |
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extern struct list_head llc_sap_list; |
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int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
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struct net_device *orig_dev); |
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int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, |
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const unsigned char *da); |
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void llc_add_pack(int type, |
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void (*handler)(struct llc_sap *sap, struct sk_buff *skb)); |
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void llc_remove_pack(int type); |
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void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); |
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struct llc_sap *llc_sap_open(unsigned char lsap, |
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int (*rcv)(struct sk_buff *skb, |
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struct net_device *dev, |
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struct packet_type *pt, |
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struct net_device *orig_dev)); |
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static inline void llc_sap_hold(struct llc_sap *sap) |
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{ |
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refcount_inc(&sap->refcnt); |
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} |
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static inline bool llc_sap_hold_safe(struct llc_sap *sap) |
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{ |
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return refcount_inc_not_zero(&sap->refcnt); |
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} |
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void llc_sap_close(struct llc_sap *sap); |
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static inline void llc_sap_put(struct llc_sap *sap) |
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{ |
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if (refcount_dec_and_test(&sap->refcnt)) |
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llc_sap_close(sap); |
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} |
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struct llc_sap *llc_sap_find(unsigned char sap_value); |
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int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
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unsigned char *dmac, unsigned char dsap); |
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void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); |
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void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); |
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void llc_station_init(void); |
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void llc_station_exit(void); |
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#ifdef CONFIG_PROC_FS |
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int llc_proc_init(void); |
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void llc_proc_exit(void); |
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#else |
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#define llc_proc_init() (0) |
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#define llc_proc_exit() do { } while(0) |
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#endif /* CONFIG_PROC_FS */ |
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#ifdef CONFIG_SYSCTL |
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int llc_sysctl_init(void); |
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void llc_sysctl_exit(void); |
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extern int sysctl_llc2_ack_timeout; |
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extern int sysctl_llc2_busy_timeout; |
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extern int sysctl_llc2_p_timeout; |
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extern int sysctl_llc2_rej_timeout; |
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#else |
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#define llc_sysctl_init() (0) |
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#define llc_sysctl_exit() do { } while(0) |
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#endif /* CONFIG_SYSCTL */ |
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#endif /* LLC_H */
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