Commit | Line | Data |
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1da177e4 LT |
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> | |
b76f5a84 | 19 | #include <linux/rculist_nulls.h> |
52d58aef OP |
20 | #include <linux/hash.h> |
21 | #include <linux/jhash.h> | |
1da177e4 | 22 | |
60063497 | 23 | #include <linux/atomic.h> |
6e2144b7 | 24 | |
1da177e4 LT |
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 | ||
6d2e3ea2 OP |
37 | #define LLC_SK_DEV_HASH_BITS 6 |
38 | #define LLC_SK_DEV_HASH_ENTRIES (1<<LLC_SK_DEV_HASH_BITS) | |
39 | ||
52d58aef OP |
40 | #define LLC_SK_LADDR_HASH_BITS 6 |
41 | #define LLC_SK_LADDR_HASH_ENTRIES (1<<LLC_SK_LADDR_HASH_BITS) | |
42 | ||
1da177e4 LT |
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; | |
58951dde | 58 | refcount_t refcnt; |
1da177e4 LT |
59 | int (*rcv_func)(struct sk_buff *skb, |
60 | struct net_device *dev, | |
f2ccd8fa DM |
61 | struct packet_type *pt, |
62 | struct net_device *orig_dev); | |
1da177e4 LT |
63 | struct llc_addr laddr; |
64 | struct list_head node; | |
b76f5a84 | 65 | spinlock_t sk_lock; |
52d58aef OP |
66 | int sk_count; |
67 | struct hlist_nulls_head sk_laddr_hash[LLC_SK_LADDR_HASH_ENTRIES]; | |
6d2e3ea2 | 68 | struct hlist_head sk_dev_hash[LLC_SK_DEV_HASH_ENTRIES]; |
9708d2b5 | 69 | struct rcu_head rcu; |
1da177e4 LT |
70 | }; |
71 | ||
6d2e3ea2 OP |
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 | ||
52d58aef OP |
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 | } | |
6d2e3ea2 | 91 | |
1da177e4 LT |
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; | |
1da177e4 | 97 | |
bf3c710f JP |
98 | int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
99 | struct net_device *orig_dev); | |
1da177e4 | 100 | |
bf3c710f JP |
101 | int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, |
102 | const unsigned char *da); | |
1da177e4 | 103 | |
bf3c710f JP |
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); | |
1da177e4 | 107 | |
bf3c710f | 108 | void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); |
1da177e4 | 109 | |
bf3c710f JP |
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)); | |
6e2144b7 ACM |
115 | static inline void llc_sap_hold(struct llc_sap *sap) |
116 | { | |
58951dde | 117 | refcount_inc(&sap->refcnt); |
6e2144b7 ACM |
118 | } |
119 | ||
0dcb8225 CW |
120 | static inline bool llc_sap_hold_safe(struct llc_sap *sap) |
121 | { | |
122 | return refcount_inc_not_zero(&sap->refcnt); | |
123 | } | |
124 | ||
bf3c710f | 125 | void llc_sap_close(struct llc_sap *sap); |
2928c19e | 126 | |
6e2144b7 ACM |
127 | static inline void llc_sap_put(struct llc_sap *sap) |
128 | { | |
58951dde | 129 | if (refcount_dec_and_test(&sap->refcnt)) |
6e2144b7 ACM |
130 | llc_sap_close(sap); |
131 | } | |
1da177e4 | 132 | |
bf3c710f | 133 | struct llc_sap *llc_sap_find(unsigned char sap_value); |
1da177e4 | 134 | |
bf3c710f | 135 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
2ef6db76 | 136 | const unsigned char *dmac, unsigned char dsap); |
1da177e4 | 137 | |
bf3c710f JP |
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); | |
2928c19e | 140 | |
bf3c710f JP |
141 | void llc_station_init(void); |
142 | void llc_station_exit(void); | |
1da177e4 LT |
143 | |
144 | #ifdef CONFIG_PROC_FS | |
bf3c710f JP |
145 | int llc_proc_init(void); |
146 | void llc_proc_exit(void); | |
1da177e4 LT |
147 | #else |
148 | #define llc_proc_init() (0) | |
149 | #define llc_proc_exit() do { } while(0) | |
150 | #endif /* CONFIG_PROC_FS */ | |
590232a7 | 151 | #ifdef CONFIG_SYSCTL |
bf3c710f JP |
152 | int llc_sysctl_init(void); |
153 | void llc_sysctl_exit(void); | |
2928c19e ACM |
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; | |
590232a7 ACM |
159 | #else |
160 | #define llc_sysctl_init() (0) | |
161 | #define llc_sysctl_exit() do { } while(0) | |
162 | #endif /* CONFIG_SYSCTL */ | |
1da177e4 | 163 | #endif /* LLC_H */ |