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 | struct rcu_head rcu; |
70 | }; |
71 | |
72 | static inline |
73 | struct hlist_head *llc_sk_dev_hash(struct llc_sap *sap, int ifindex) |
74 | { |
75 | u32 bucket = hash_32(val: ifindex, LLC_SK_DEV_HASH_BITS); |
76 | |
77 | return &sap->sk_dev_hash[bucket]; |
78 | } |
79 | |
80 | static inline |
81 | u32 llc_sk_laddr_hashfn(struct llc_sap *sap, const struct llc_addr *laddr) |
82 | { |
83 | return hash_32(val: jhash(key: laddr->mac, length: sizeof(laddr->mac), initval: 0), |
84 | LLC_SK_LADDR_HASH_BITS); |
85 | } |
86 | |
87 | static inline |
88 | struct hlist_nulls_head *llc_sk_laddr_hash(struct llc_sap *sap, |
89 | const struct llc_addr *laddr) |
90 | { |
91 | return &sap->sk_laddr_hash[llc_sk_laddr_hashfn(sap, laddr)]; |
92 | } |
93 | |
94 | #define LLC_DEST_INVALID 0 /* Invalid LLC PDU type */ |
95 | #define LLC_DEST_SAP 1 /* Type 1 goes here */ |
96 | #define LLC_DEST_CONN 2 /* Type 2 goes here */ |
97 | |
98 | extern struct list_head llc_sap_list; |
99 | |
100 | int llc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, |
101 | struct net_device *orig_dev); |
102 | |
103 | int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, |
104 | const unsigned char *da); |
105 | |
106 | void llc_add_pack(int type, |
107 | void (*handler)(struct llc_sap *sap, struct sk_buff *skb)); |
108 | void llc_remove_pack(int type); |
109 | |
110 | void llc_set_station_handler(void (*handler)(struct sk_buff *skb)); |
111 | |
112 | struct llc_sap *llc_sap_open(unsigned char lsap, |
113 | int (*rcv)(struct sk_buff *skb, |
114 | struct net_device *dev, |
115 | struct packet_type *pt, |
116 | struct net_device *orig_dev)); |
117 | static inline void llc_sap_hold(struct llc_sap *sap) |
118 | { |
119 | refcount_inc(r: &sap->refcnt); |
120 | } |
121 | |
122 | static inline bool llc_sap_hold_safe(struct llc_sap *sap) |
123 | { |
124 | return refcount_inc_not_zero(r: &sap->refcnt); |
125 | } |
126 | |
127 | void llc_sap_close(struct llc_sap *sap); |
128 | |
129 | static inline void llc_sap_put(struct llc_sap *sap) |
130 | { |
131 | if (refcount_dec_and_test(r: &sap->refcnt)) |
132 | llc_sap_close(sap); |
133 | } |
134 | |
135 | struct llc_sap *llc_sap_find(unsigned char sap_value); |
136 | |
137 | int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, |
138 | const unsigned char *dmac, unsigned char dsap); |
139 | |
140 | void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); |
141 | void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); |
142 | |
143 | void llc_station_init(void); |
144 | void llc_station_exit(void); |
145 | |
146 | #ifdef CONFIG_PROC_FS |
147 | int llc_proc_init(void); |
148 | void llc_proc_exit(void); |
149 | #else |
150 | #define llc_proc_init() (0) |
151 | #define llc_proc_exit() do { } while(0) |
152 | #endif /* CONFIG_PROC_FS */ |
153 | #ifdef CONFIG_SYSCTL |
154 | int llc_sysctl_init(void); |
155 | void llc_sysctl_exit(void); |
156 | |
157 | extern int sysctl_llc2_ack_timeout; |
158 | extern int sysctl_llc2_busy_timeout; |
159 | extern int sysctl_llc2_p_timeout; |
160 | extern int sysctl_llc2_rej_timeout; |
161 | #else |
162 | #define llc_sysctl_init() (0) |
163 | #define llc_sysctl_exit() do { } while(0) |
164 | #endif /* CONFIG_SYSCTL */ |
165 | #endif /* LLC_H */ |
166 | |