include/linux/atmdev.h

   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
 125 static inline struct atm_vcc *atm_sk(struct sock *sk)
 126 {
 127         return (struct atm_vcc *)sk;
 128 }
 129
 130 static inline struct atm_vcc *ATM_SD(struct socket *sock)
 131 {
 132         return atm_sk(sock->sk);
 133 }
 134
 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 date */
 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
 180 /*
 181  * ioctl, getsockopt, and setsockopt are optional and can be set to NULL.
 182  */
 183
 184 struct atmdev_ops { /* only send is required */
 185         void (*dev_close)(struct atm_dev *dev);
 186         int (*open)(struct atm_vcc *vcc);
 187         void (*close)(struct atm_vcc *vcc);
 188         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 189 #ifdef CONFIG_COMPAT
 190         int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
 191                             void __user *arg);
 192 #endif
 193         int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
 194             void __user *optval,int optlen);
 195         int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
 196             void __user *optval,unsigned int optlen);
 197         int (*send)(struct atm_vcc *vcc,struct sk_buff *skb);
 198         int (*send_oam)(struct atm_vcc *vcc,void *cell,int flags);
 199         void (*phy_put)(struct atm_dev *dev,unsigned char value,
 200             unsigned long addr);
 201         unsigned char (*phy_get)(struct atm_dev *dev,unsigned long addr);
 202         int (*change_qos)(struct atm_vcc *vcc,struct atm_qos *qos,int flags);
 203         int (*proc_read)(struct atm_dev *dev,loff_t *pos,char *page);
 204         struct module *owner;
 205 };
 206
 207 struct atmphy_ops {
 208         int (*start)(struct atm_dev *dev);
 209         int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
 210         void (*interrupt)(struct atm_dev *dev);
 211         int (*stop)(struct atm_dev *dev);
 212 };
 213
 214 struct atm_skb_data {
 215         struct atm_vcc  *vcc;           /* ATM VCC */
 216         unsigned long   atm_options;    /* ATM layer options */
 217         unsigned int    acct_truesize;  /* truesize accounted to vcc */
 218 };
 219
 220 #define VCC_HTABLE_SIZE 32
 221
 222 extern struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
 223 extern rwlock_t vcc_sklist_lock;
 224
 225 #define ATM_SKB(skb) (((struct atm_skb_data *) (skb)->cb))
 226
 227 struct atm_dev *atm_dev_register(const char *type, struct device *parent,
 228                                  const struct atmdev_ops *ops,
 229                                  int number, /* -1 == pick first available */
 230                                  unsigned long *flags);
 231 struct atm_dev *atm_dev_lookup(int number);
 232 void atm_dev_deregister(struct atm_dev *dev);
 233
 234 /* atm_dev_signal_change
 235  *
 236  * Propagate lower layer signal change in atm_dev->signal to netdevice.
 237  * The event will be sent via a notifier call chain.
 238  */
 239 void atm_dev_signal_change(struct atm_dev *dev, char signal);
 240
 241 void vcc_insert_socket(struct sock *sk);
 242
 243 void atm_dev_release_vccs(struct atm_dev *dev);
 244
 245 static inline void atm_account_tx(struct atm_vcc *vcc, struct sk_buff *skb)
 246 {
 247         /*
 248          * Because ATM skbs may not belong to a sock (and we don't
 249          * necessarily want to), skb->truesize may be adjusted,
 250          * escaping the hack in pskb_expand_head() which avoids
 251          * doing so for some cases. So stash the value of truesize
 252          * at the time we accounted it, and atm_pop_raw() can use
 253          * that value later, in case it changes.
 254          */
 255         refcount_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
 256         ATM_SKB(skb)->acct_truesize = skb->truesize;
 257         ATM_SKB(skb)->atm_options = vcc->atm_options;
 258 }
 259
 260 static inline void atm_force_charge(struct atm_vcc *vcc,int truesize)
 261 {
 262         atomic_add(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 263 }
 264
 265
 266 static inline void atm_return(struct atm_vcc *vcc,int truesize)
 267 {
 268         atomic_sub(truesize, &sk_atm(vcc)->sk_rmem_alloc);
 269 }
 270
 271
 272 static inline int atm_may_send(struct atm_vcc *vcc,unsigned int size)
 273 {
 274         return (size + refcount_read(&sk_atm(vcc)->sk_wmem_alloc)) <
 275                sk_atm(vcc)->sk_sndbuf;
 276 }
 277
 278
 279 static inline void atm_dev_hold(struct atm_dev *dev)
 280 {
 281         refcount_inc(&dev->refcnt);
 282 }
 283
 284
 285 static inline void atm_dev_put(struct atm_dev *dev)
 286 {
 287         if (refcount_dec_and_test(&dev->refcnt)) {
 288                 BUG_ON(!test_bit(ATM_DF_REMOVED, &dev->flags));
 289                 if (dev->ops->dev_close)
 290                         dev->ops->dev_close(dev);
 291                 put_device(&dev->class_dev);
 292         }
 293 }
 294
 295
 296 int atm_charge(struct atm_vcc *vcc,int truesize);
 297 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
 298     gfp_t gfp_flags);
 299 int atm_pcr_goal(const struct atm_trafprm *tp);
 300
 301 void vcc_release_async(struct atm_vcc *vcc, int reply);
 302
 303 struct atm_ioctl {
 304         struct module *owner;
 305         /* A module reference is kept if appropriate over this call.
 306          * Return -ENOIOCTLCMD if you don't handle it. */
 307         int (*ioctl)(struct socket *, unsigned int cmd, unsigned long arg);
 308         struct list_head list;
 309 };
 310
 311 /**
 312  * register_atm_ioctl - register handler for ioctl operations
 313  *
 314  * Special (non-device) handlers of ioctl's should
 315  * register here. If you're a normal device, you should
 316  * set .ioctl in your atmdev_ops instead.
 317  */
 318 void register_atm_ioctl(struct atm_ioctl *);
 319
 320 /**
 321  * deregister_atm_ioctl - remove the ioctl handler
 322  */
 323 void deregister_atm_ioctl(struct atm_ioctl *);
 324
 325
 326 /* register_atmdevice_notifier - register atm_dev notify events
 327  *
 328  * Clients like br2684 will register notify events
 329  * Currently we notify of signal found/lost
 330  */
 331 int register_atmdevice_notifier(struct notifier_block *nb);
 332 void unregister_atmdevice_notifier(struct notifier_block *nb);
 333
 334 #endif