Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
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
22struct net_device;
23struct packet_type;
24struct sk_buff;
25
26struct 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 */
45struct 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
66extern struct list_head llc_sap_list;
67extern rwlock_t llc_sap_list_lock;
68
69extern int llc_rcv(struct sk_buff *skb, struct net_device *dev,
70 struct packet_type *pt, struct net_device *orig_dev);
71
72extern int llc_mac_hdr_init(struct sk_buff *skb,
73 const unsigned char *sa, const unsigned char *da);
74
75extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap,
76 struct sk_buff *skb));
77extern void llc_remove_pack(int type);
78
79extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb));
80
81extern 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));
86static inline void llc_sap_hold(struct llc_sap *sap)
87{
88 atomic_inc(&sap->refcnt);
89}
90
91extern void llc_sap_close(struct llc_sap *sap);
92
93static 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
99extern struct llc_sap *llc_sap_find(unsigned char sap_value);
100
101extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
102 unsigned char *dmac, unsigned char dsap);
103
104extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
105extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
106
107extern int llc_station_init(void);
108extern void llc_station_exit(void);
109
110#ifdef CONFIG_PROC_FS
111extern int llc_proc_init(void);
112extern 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
118extern int llc_sysctl_init(void);
119extern void llc_sysctl_exit(void);
120
121extern int sysctl_llc2_ack_timeout;
122extern int sysctl_llc2_busy_timeout;
123extern int sysctl_llc2_p_timeout;
124extern int sysctl_llc2_rej_timeout;
125extern 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 */