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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 | atomic_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 | }; |
70 | |
71 | static inline |
72 | struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex) |
73 | { |
74 | return &sap->sk_dev_hash[ifindex % LLC_SK_DEV_HASH_ENTRIES]; |
75 | } |
76 | |
77 | static inline |
78 | u32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr) |
79 | { |
80 | return hash_32(jhash(laddr->mac, sizeof(laddr->mac), 0), |
81 | LLC_SK_LADDR_HASH_BITS); |
82 | } |
83 | |
84 | static inline |
85 | struct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap, |
86 | const struct llc_addr *laddr) |
87 | { |
88 | return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)]; |
89 | } |
90 | |
91 | #define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */ |
92 | #define LLC_DEST_SAP 1 /* Type 1 goes here */ |
93 | #define LLC_DEST_CONN 2 /* Type 2 goes here */ |
94 | |
95 | extern struct list_head llc_sap_list; |
96 | extern spinlock_t llc_sap_list_lock; |
97 | |
98 | extern int llc_rcv(struct sk_buff *skb, struct net_device *dev, |
99 | struct packet_type *pt, struct net_device *orig_dev); |
100 | |
101 | extern int llc_mac_hdr_init(struct sk_buff *skb, |
102 | const unsigned char *sa, const unsigned char *da); |
103 | |
104 | extern void llc_add_pack(int type, void (*handler)(struct llc_sap *sap, |
105 | struct sk_buff *skb)); |
106 | extern void llc_remove_pack(int type); |
107 | |
108 | extern void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); |
109 | |
110 | extern 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 | atomic_inc(&sap->refcnt); |
118 | } |
119 | |
120 | extern void llc_sap_close(struct llc_sap *sap); |
121 | |
122 | static inline void llc_sap_put(struct llc_sap *sap) |
123 | { |
124 | if (atomic_dec_and_test(&sap->refcnt)) |
125 | llc_sap_close(sap); |
126 | } |
127 | |
128 | extern struct llc_sap *llc_sap_find(unsigned char sap_value); |
129 | |
130 | extern int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
131 | unsigned char *dmac, unsigned char dsap); |
132 | |
133 | extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); |
134 | extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); |
135 | |
136 | extern void llc_station_init(void); |
137 | extern void llc_station_exit(void); |
138 | |
139 | #ifdef CONFIG_PROC_FS |
140 | extern int llc_proc_init(void); |
141 | extern void llc_proc_exit(void); |
142 | #else |
143 | #define llc_proc_init() (0) |
144 | #define llc_proc_exit() do { } while(0) |
145 | #endif /* CONFIG_PROC_FS */ |
146 | #ifdef CONFIG_SYSCTL |
147 | extern int llc_sysctl_init(void); |
148 | extern void llc_sysctl_exit(void); |
149 | |
150 | extern int sysctl_llc2_ack_timeout; |
151 | extern int sysctl_llc2_busy_timeout; |
152 | extern int sysctl_llc2_p_timeout; |
153 | extern int sysctl_llc2_rej_timeout; |
154 | #else |
155 | #define llc_sysctl_init() (0) |
156 | #define llc_sysctl_exit() do { } while(0) |
157 | #endif /* CONFIG_SYSCTL */ |
158 | #endif /* LLC_H */ |
159 |
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