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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 | 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 | }; | |
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 | ||
97 | int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, | |
98 | struct net_device *orig_dev); | |
99 | ||
100 | int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, | |
101 | const unsigned char *da); | |
102 | ||
103 | void llc_add_pack(int type, | |
104 | void (*handler)(struct llc_sap *sap, struct sk_buff *skb)); | |
105 | void llc_remove_pack(int type); | |
106 | ||
107 | void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); | |
108 | ||
109 | struct llc_sap *llc_sap_open(unsigned char lsap, | |
110 | int (*rcv)(struct sk_buff *skb, | |
111 | struct net_device *dev, | |
112 | struct packet_type *pt, | |
113 | struct net_device *orig_dev)); | |
114 | static inline void llc_sap_hold(struct llc_sap *sap) | |
115 | { | |
116 | refcount_inc(&sap->refcnt); | |
117 | } | |
118 | ||
119 | void llc_sap_close(struct llc_sap *sap); | |
120 | ||
121 | static inline void llc_sap_put(struct llc_sap *sap) | |
122 | { | |
123 | if (refcount_dec_and_test(&sap->refcnt)) | |
124 | llc_sap_close(sap); | |
125 | } | |
126 | ||
127 | struct llc_sap *llc_sap_find(unsigned char sap_value); | |
128 | ||
129 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, | |
130 | unsigned char *dmac, unsigned char dsap); | |
131 | ||
132 | void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); | |
133 | void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); | |
134 | ||
135 | void llc_station_init(void); | |
136 | void llc_station_exit(void); | |
137 | ||
138 | #ifdef CONFIG_PROC_FS | |
139 | int llc_proc_init(void); | |
140 | void llc_proc_exit(void); | |
141 | #else | |
142 | #define llc_proc_init() (0) | |
143 | #define llc_proc_exit() do { } while(0) | |
144 | #endif /* CONFIG_PROC_FS */ | |
145 | #ifdef CONFIG_SYSCTL | |
146 | int llc_sysctl_init(void); | |
147 | void llc_sysctl_exit(void); | |
148 | ||
149 | extern int sysctl_llc2_ack_timeout; | |
150 | extern int sysctl_llc2_busy_timeout; | |
151 | extern int sysctl_llc2_p_timeout; | |
152 | extern int sysctl_llc2_rej_timeout; | |
153 | #else | |
154 | #define llc_sysctl_init() (0) | |
155 | #define llc_sysctl_exit() do { } while(0) | |
156 | #endif /* CONFIG_SYSCTL */ | |
157 | #endif /* LLC_H */ |