1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* atmdev.h - ATM device driver declarations and various related items */
3 #ifndef LINUX_ATMDEV_H
4 #define LINUX_ATMDEV_H
5
6
7 #include <linux/wait.h> /* wait_queue_head_t */
8 #include <linux/time.h> /* struct timeval */
9 #include <linux/net.h>
10 #include <linux/bug.h>
11 #include <linux/skbuff.h> /* struct sk_buff */
12 #include <linux/uio.h>
13 #include <net/sock.h>
14 #include <linux/atomic.h>
15 #include <linux/refcount.h>
16 #include <uapi/linux/atmdev.h>
17
18 #ifdef CONFIG_PROC_FS
19 #include <linux/proc_fs.h>
20
21 extern struct proc_dir_entry *atm_proc_root;
22 #endif
23
24 #ifdef CONFIG_COMPAT
25 #include <linux/compat.h>
26 struct compat_atm_iobuf {
27 int length;
28 compat_uptr_t buffer;
29 };
30 #endif
31
32 struct k_atm_aal_stats {
33 #define __HANDLE_ITEM(i) atomic_t i
34 __AAL_STAT_ITEMS
35 #undef __HANDLE_ITEM
36 };
37
38
39 struct k_atm_dev_stats {
40 struct k_atm_aal_stats aal0;
41 struct k_atm_aal_stats aal34;
42 struct k_atm_aal_stats aal5;
43 };
44
45 struct device;
46
47 enum {
48 ATM_VF_ADDR, /* Address is in use. Set by anybody, cleared
49 by device driver. */
50 ATM_VF_READY, /* VC is ready to transfer data. Set by device
51 driver, cleared by anybody. */
52 ATM_VF_PARTIAL, /* resources are bound to PVC (partial PVC
53 setup), controlled by socket layer */
54 ATM_VF_REGIS, /* registered with demon, controlled by SVC
55 socket layer */
56 ATM_VF_BOUND, /* local SAP is set, controlled by SVC socket
57 layer */
58 ATM_VF_RELEASED, /* demon has indicated/requested release,
59 controlled by SVC socket layer */
60 ATM_VF_HASQOS, /* QOS parameters have been set */
61 ATM_VF_LISTEN, /* socket is used for listening */
62 ATM_VF_META, /* SVC socket isn't used for normal data
63 traffic and doesn't depend on signaling
64 to be available */
65 ATM_VF_SESSION, /* VCC is p2mp session control descriptor */
66 ATM_VF_HASSAP, /* SAP has been set */
67 ATM_VF_CLOSE, /* asynchronous close - treat like VF_RELEASED*/
68 ATM_VF_WAITING, /* waiting for reply from sigd */
69 ATM_VF_IS_CLIP, /* in use by CLIP protocol */
70 };
71
72
73 #define ATM_VF2VS(flags) \
74 (test_bit(ATM_VF_READY,&(flags)) ? ATM_VS_CONNECTED : \
75 test_bit(ATM_VF_RELEASED,&(flags)) ? ATM_VS_CLOSING : \
76 test_bit(ATM_VF_LISTEN,&(flags)) ? ATM_VS_LISTEN : \
77 test_bit(ATM_VF_REGIS,&(flags)) ? ATM_VS_INUSE : \
78 test_bit(ATM_VF_BOUND,&(flags)) ? ATM_VS_BOUND : ATM_VS_IDLE)
79
80
81 enum {
82 ATM_DF_REMOVED, /* device was removed from atm_devs list */
83 };
84
85
86 #define ATM_PHY_SIG_LOST 0 /* no carrier/light */
87 #define ATM_PHY_SIG_UNKNOWN 1 /* carrier/light status is unknown */
88 #define ATM_PHY_SIG_FOUND 2 /* carrier/light okay */
89
90 #define ATM_ATMOPT_CLP 1 /* set CLP bit */
91
92 struct atm_vcc {
93 /* struct sock has to be the first member of atm_vcc */
94 struct sock sk;
95 unsigned long flags; /* VCC flags (ATM_VF_*) */
96 short vpi; /* VPI and VCI (types must be equal */
97 /* with sockaddr) */
98 int vci;
99 unsigned long aal_options; /* AAL layer options */
100 unsigned long atm_options; /* ATM layer options */
101 struct atm_dev *dev; /* device back pointer */
102 struct atm_qos qos; /* QOS */
103 struct atm_sap sap; /* SAP */
104 void (*release_cb)(struct atm_vcc *vcc); /* release_sock callback */
105 void (*push)(struct atm_vcc *vcc,struct sk_buff *skb);
106 void (*pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* optional */
107 int (*push_oam)(struct atm_vcc *vcc,void *cell);
108 int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
109 void *dev_data; /* per-device data */
110 void *proto_data; /* per-protocol data */
111 struct k_atm_aal_stats *stats; /* pointer to AAL stats group */
112 struct module *owner; /* owner of ->push function */
113 /* SVC part --- may move later ------------------------------------- */
114 short itf; /* interface number */
115 struct sockaddr_atmsvc local;
116 struct sockaddr_atmsvc remote;
117 /* Multipoint part ------------------------------------------------- */
118 struct atm_vcc *session; /* session VCC descriptor */
119 /* Other stuff ----------------------------------------------------- */
120 void *user_back; /* user backlink - not touched by */
121 /* native ATM stack. Currently used */
122 /* by CLIP and sch_atm. */
123 };
124
atm_sk(struct sock * sk)125 static inline struct atm_vcc *atm_sk(struct sock *sk)
126 {
127 return (struct atm_vcc *)sk;
128 }
129
ATM_SD(struct socket * sock)130 static inline struct atm_vcc *ATM_SD(struct socket *sock)
131 {
132 return atm_sk(sock->sk);
133 }
134
sk_atm(struct atm_vcc * vcc)135 static inline struct sock *sk_atm(struct atm_vcc *vcc)
136 {
137 return (struct sock *)vcc;
138 }
139
140 struct atm_dev_addr {
141 struct sockaddr_atmsvc addr; /* ATM address */
142 struct list_head entry; /* next address */
143 };
144
145 enum atm_addr_type_t { ATM_ADDR_LOCAL, ATM_ADDR_LECS };
146
147 struct atm_dev {
148 const struct atmdev_ops *ops; /* device operations; NULL if unused */
149 const struct atmphy_ops *phy; /* PHY operations, may be undefined */
150 /* (NULL) */
151 const char *type; /* device type name */
152 int number; /* device index */
153 void *dev_data; /* per-device data */
154 void *phy_data; /* private PHY data */
155 unsigned long flags; /* device flags (ATM_DF_*) */
156 struct list_head local; /* local ATM addresses */
157 struct list_head lecs; /* LECS ATM addresses learned via ILMI */
158 unsigned char esi[ESI_LEN]; /* ESI ("MAC" addr) */
159 struct atm_cirange ci_range; /* VPI/VCI range */
160 struct k_atm_dev_stats stats; /* statistics */
161 char signal; /* signal status (ATM_PHY_SIG_*) */
162 int link_rate; /* link rate (default: OC3) */
163 refcount_t refcnt; /* reference count */
164 spinlock_t lock; /* protect internal members */
165 #ifdef CONFIG_PROC_FS
166 struct proc_dir_entry *proc_entry; /* proc entry */
167 char *proc_name; /* proc entry name */
168 #endif
169 struct device class_dev; /* sysfs device */
170 struct list_head dev_list; /* linkage */
171 };
172
173
174 /* OF: send_Oam Flags */
175
176 #define ATM_OF_IMMED 1 /* Attempt immediate delivery */
177 #define ATM_OF_INRATE 2 /* Attempt in-rate delivery */
178
179 struct atmdev_ops { /* only send is required */
180 void (*dev_close)(struct atm_dev *dev);
181 int (*open)(struct atm_vcc *vcc);
182 void (*close)(struct atm_vcc *vcc);
183 int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
184 #ifdef CONFIG_COMPAT
185 int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
186 void __user *arg);
187 #endif
188 int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
189 int (*send_bh)(struct atm_vcc *vcc, struct sk_buff *skb);
190 int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
191 void (*phy_put)(struct atm_dev *dev,unsigned char value,
192 unsigned long addr);
193 unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
194 int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
195 int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
196 struct module *owner;
197 };
198
199 struct atmphy_ops {
200 int (*start)(struct atm_dev *dev);
201 int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
202 void (*interrupt)(struct atm_dev *dev);
203 int (*stop)(struct atm_dev *dev);
204 };
205
206 struct atm_skb_data {
207 struct atm_vcc *vcc; /* ATM VCC */
208 unsigned long atm_options; /* ATM layer options */
209 unsigned int acct_truesize; /* truesize accounted to vcc */
210 } __packed;
211
212 #define VCC_HTABLE_SIZE 32
213
214 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
215 extern rwlock_t vcc_sklist_lock;
216
217 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
218
219 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
220 const struct atmdev_ops *ops,
221 int number, /* -1 == pick first available */
222 unsigned long *flags);
223 struct atm_dev *atm_dev_lookup(int number);
224 void atm_dev_deregister(struct atm_dev *dev);
225
226 /* atm_dev_signal_change
227 *
228 * Propagate lower layer signal change in atm_dev->signal to netdevice.
229 * The event will be sent via a notifier call chain.
230 */
231 void atm_dev_signal_change(struct atm_dev *dev, char signal);
232
233 void vcc_insert_socket(struct sock *sk);
234
235 void atm_dev_release_vccs(struct atm_dev *dev);
236
atm_account_tx(struct atm_vcc * vcc,struct sk_buff * skb)237 static inline void atm_account_tx(struct atm_vcc *vcc, struct sk_buff *skb)
238 {
239 /*
240 * Because ATM skbs may not belong to a sock (and we don't
241 * necessarily want to), skb->truesize may be adjusted,
242 * escaping the hack in pskb_expand_head() which avoids
243 * doing so for some cases. So stash the value of truesize
244 * at the time we accounted it, and atm_pop_raw() can use
245 * that value later, in case it changes.
246 */
247 refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
248 ATM_SKB(skb)->acct_truesize = skb->truesize;
249 ATM_SKB(skb)->atm_options = vcc->atm_options;
250 }
251
atm_force_charge(struct atm_vcc * vcc,int truesize)252 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
253 {
254 atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
255 }
256
257
atm_return(struct atm_vcc * vcc,int truesize)258 static inline void atm_return(struct atm_vcc *vcc,int truesize)
259 {
260 atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
261 }
262
263
atm_may_send(struct atm_vcc * vcc,unsigned int size)264 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
265 {
266 return (size + refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) <
267 sk_atm(vcc)->sk_sndbuf;
268 }
269
270
atm_dev_hold(struct atm_dev * dev)271 static inline void atm_dev_hold(struct atm_dev *dev)
272 {
273 refcount_inc(&dev->refcnt);
274 }
275
276
atm_dev_put(struct atm_dev * dev)277 static inline void atm_dev_put(struct atm_dev *dev)
278 {
279 if (refcount_dec_and_test(&dev->refcnt)) {
280 BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
281 if (dev->ops->dev_close)
282 dev->ops->dev_close(dev);
283 put_device(&dev->class_dev);
284 }
285 }
286
287
288 int atm_charge(struct atm_vcc *vcc,int truesize);
289 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
290 gfp_t gfp_flags);
291 int atm_pcr_goal(const struct atm_trafprm *tp);
292
293 void vcc_release_async(struct atm_vcc *vcc, int reply);
294
295 struct atm_ioctl {
296 struct module *owner;
297 /* A module reference is kept if appropriate over this call.
298 * Return -ENOIOCTLCMD if you don't handle it. */
299 int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
300 struct list_head list;
301 };
302
303 /**
304 * register_atm_ioctl - register handler for ioctl operations
305 *
306 * Special (non-device) handlers of ioctl's should
307 * register here. If you're a normal device, you should
308 * set .ioctl in your atmdev_ops instead.
309 */
310 void register_atm_ioctl(struct atm_ioctl *);
311
312 /**
313 * deregister_atm_ioctl - remove the ioctl handler
314 */
315 void deregister_atm_ioctl(struct atm_ioctl *);
316
317
318 /* register_atmdevice_notifier - register atm_dev notify events
319 *
320 * Clients like br2684 will register notify events
321 * Currently we notify of signal found/lost
322 */
323 int register_atmdevice_notifier(struct notifier_block *nb);
324 void unregister_atmdevice_notifier(struct notifier_block *nb);
325
326 #endif
327