root/include/linux/netdevice.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. dev_lock_list
  2. dev_unlock_list
  3. dev_lock_wait

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions for the Interfaces handler.
   7  *
   8  * Version:     @(#)dev.h       1.0.10  08/12/93
   9  *
  10  * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Corey Minyard <wf-rch!minyard@relay.EU.net>
  13  *              Donald J. Becker, <becker@super.org>
  14  *              Alan Cox, <A.Cox@swansea.ac.uk>
  15  *              Bjorn Ekwall. <bj0rn@blox.se>
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  *
  22  *              Moved to /usr/include/linux for NET3
  23  */
  24 #ifndef _LINUX_NETDEVICE_H
  25 #define _LINUX_NETDEVICE_H
  26 
  27 #include <linux/config.h>
  28 #include <linux/if.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/skbuff.h>
  31 
  32 /* for future expansion when we will have different priorities. */
  33 #define DEV_NUMBUFFS    3
  34 #define MAX_ADDR_LEN    7
  35 #ifndef CONFIG_AX25
  36 #ifndef CONFIG_TR
  37 #define MAX_HEADER      32              /* We really need about 18 worst case .. so 32 is aligned */
  38 #else
  39 #define MAX_HEADER      48              /* Token Ring header needs 40 bytes ... 48 is aligned */ 
  40 #endif
  41 #else
  42 #define MAX_HEADER      96              /* AX.25 + NetROM */
  43 #endif
  44 
  45 #define IS_MYADDR       1               /* address is (one of) our own  */
  46 #define IS_LOOPBACK     2               /* address is for LOOPBACK      */
  47 #define IS_BROADCAST    3               /* address is a valid broadcast */
  48 #define IS_INVBCAST     4               /* Wrong netmask bcast not for us (unused)*/
  49 #define IS_MULTICAST    5               /* Multicast IP address */
  50 
  51 /*
  52  *      We tag these structures with multicasts.
  53  */
  54  
  55 struct dev_mc_list
  56 {       
  57         struct dev_mc_list *next;
  58         char dmi_addr[MAX_ADDR_LEN];
  59         unsigned short dmi_addrlen;
  60         unsigned short dmi_users;
  61 };
  62 
  63 struct hh_cache
  64 {
  65         struct hh_cache *hh_next;
  66         unsigned long   hh_refcnt;      /* number of users */
  67         void            *hh_arp;        /* Opaque pointer, used by
  68                                          * any address resolution module,
  69                                          * not only ARP.
  70                                          */
  71         unsigned short  hh_type;        /* protocol identifier, f.e ETH_P_IP */
  72         char            hh_uptodate;    /* hh_data is valid */
  73         char            hh_data[16];    /* cached hardware header */
  74 };
  75 
  76 /*
  77  * The DEVICE structure.
  78  * Actually, this whole structure is a big mistake.  It mixes I/O
  79  * data with strictly "high-level" data, and it has to know about
  80  * almost every data structure used in the INET module.  
  81  */
  82 struct device 
  83 {
  84 
  85   /*
  86    * This is the first field of the "visible" part of this structure
  87    * (i.e. as seen by users in the "Space.c" file).  It is the name
  88    * the interface.
  89    */
  90   char                    *name;
  91 
  92   /* I/O specific fields - FIXME: Merge these and struct ifmap into one */
  93   unsigned long           rmem_end;             /* shmem "recv" end     */
  94   unsigned long           rmem_start;           /* shmem "recv" start   */
  95   unsigned long           mem_end;              /* shared mem end       */
  96   unsigned long           mem_start;            /* shared mem start     */
  97   unsigned long           base_addr;            /* device I/O address   */
  98   unsigned char           irq;                  /* device IRQ number    */
  99 
 100   /* Low-level status flags. */
 101   volatile unsigned char  start,                /* start an operation   */
 102                           interrupt;            /* interrupt arrived    */
 103   unsigned long           tbusy;                /* transmitter busy must be long for bitops */
 104 
 105   struct device           *next;
 106 
 107   /* The device initialization function. Called only once. */
 108   int                     (*init)(struct device *dev);
 109 
 110   /* Some hardware also needs these fields, but they are not part of the
 111      usual set specified in Space.c. */
 112   unsigned char           if_port;              /* Selectable AUI, TP,..*/
 113   unsigned char           dma;                  /* DMA channel          */
 114 
 115   struct enet_statistics* (*get_stats)(struct device *dev);
 116 
 117   /*
 118    * This marks the end of the "visible" part of the structure. All
 119    * fields hereafter are internal to the system, and may change at
 120    * will (read: may be cleaned up at will).
 121    */
 122 
 123   /* These may be needed for future network-power-down code. */
 124   unsigned long           trans_start;  /* Time (in jiffies) of last Tx */
 125   unsigned long           last_rx;      /* Time of last Rx              */
 126 
 127   unsigned short          flags;        /* interface flags (a la BSD)   */
 128   unsigned short          family;       /* address family ID (AF_INET)  */
 129   unsigned short          metric;       /* routing metric (not used)    */
 130   unsigned short          mtu;          /* interface MTU value          */
 131   unsigned short          type;         /* interface hardware type      */
 132   unsigned short          hard_header_len;      /* hardware hdr length  */
 133   void                    *priv;        /* pointer to private data      */
 134 
 135   /* Interface address info. */
 136   unsigned char           broadcast[MAX_ADDR_LEN];      /* hw bcast add */
 137   unsigned char           pad;                          /* make dev_addr aligned to 8 bytes */
 138   unsigned char           dev_addr[MAX_ADDR_LEN];       /* hw address   */
 139   unsigned char           addr_len;     /* hardware address length      */
 140   unsigned long           pa_addr;      /* protocol address             */
 141   unsigned long           pa_brdaddr;   /* protocol broadcast addr      */
 142   unsigned long           pa_dstaddr;   /* protocol P-P other side addr */
 143   unsigned long           pa_mask;      /* protocol netmask             */
 144   unsigned short          pa_alen;      /* protocol address length      */
 145 
 146   struct dev_mc_list     *mc_list;      /* Multicast mac addresses      */
 147   int                    mc_count;      /* Number of installed mcasts   */
 148   
 149   struct ip_mc_list      *ip_mc_list;   /* IP multicast filter chain    */
 150     
 151   /* For load balancing driver pair support */
 152   
 153   unsigned long            pkt_queue;   /* Packets queued */
 154   struct device           *slave;       /* Slave device */
 155   
 156 
 157   /* Pointer to the interface buffers. */
 158   struct sk_buff_head     buffs[DEV_NUMBUFFS];
 159 
 160   /* Pointers to interface service routines. */
 161   int                     (*open)(struct device *dev);
 162   int                     (*stop)(struct device *dev);
 163   int                     (*hard_start_xmit) (struct sk_buff *skb,
 164                                               struct device *dev);
 165   int                     (*hard_header) (struct sk_buff *skb,
 166                                           struct device *dev,
 167                                           unsigned short type,
 168                                           void *daddr,
 169                                           void *saddr,
 170                                           unsigned len);
 171   int                     (*rebuild_header)(void *eth, struct device *dev,
 172                                 unsigned long raddr, struct sk_buff *skb);
 173 #define HAVE_MULTICAST                   
 174   void                    (*set_multicast_list)(struct device *dev);
 175 #define HAVE_SET_MAC_ADDR                
 176   int                     (*set_mac_address)(struct device *dev, void *addr);
 177 #define HAVE_PRIVATE_IOCTL
 178   int                     (*do_ioctl)(struct device *dev, struct ifreq *ifr, int cmd);
 179 #define HAVE_SET_CONFIG
 180   int                     (*set_config)(struct device *dev, struct ifmap *map);
 181 #define HAVE_HEADER_CACHE
 182   void                    (*header_cache_bind)(struct hh_cache **hhp, struct device *dev, unsigned short htype, __u32 daddr);
 183   void                    (*header_cache_update)(struct hh_cache *hh, struct device *dev, unsigned char *  haddr);
 184 };
 185 
 186 
 187 struct packet_type {
 188   unsigned short        type;   /* This is really htons(ether_type). */
 189   struct device *       dev;
 190   int                   (*func) (struct sk_buff *, struct device *,
 191                                  struct packet_type *);
 192   void                  *data;
 193   struct packet_type    *next;
 194 };
 195 
 196 
 197 #ifdef __KERNEL__
 198 
 199 #include <linux/notifier.h>
 200 
 201 /* Used by dev_rint */
 202 #define IN_SKBUFF       1
 203 
 204 extern volatile unsigned long in_bh;
 205 
 206 extern struct device    loopback_dev;
 207 extern struct device    *dev_base;
 208 extern struct packet_type *ptype_base[16];
 209 
 210 
 211 extern int              ip_addr_match(unsigned long addr1, unsigned long addr2);
 212 extern int              ip_chk_addr(unsigned long addr);
 213 extern struct device    *ip_dev_check(unsigned long daddr);
 214 extern unsigned long    ip_my_addr(void);
 215 extern unsigned long    ip_get_mask(unsigned long addr);
 216 extern struct device    *ip_dev_find(unsigned long addr);
 217 extern struct device    *dev_getbytype(unsigned short type);
 218 
 219 extern void             dev_add_pack(struct packet_type *pt);
 220 extern void             dev_remove_pack(struct packet_type *pt);
 221 extern struct device    *dev_get(const char *name);
 222 extern int              dev_open(struct device *dev);
 223 extern int              dev_close(struct device *dev);
 224 extern void             dev_queue_xmit(struct sk_buff *skb, struct device *dev,
 225                                        int pri);
 226 #define HAVE_NETIF_RX 1
 227 extern void             netif_rx(struct sk_buff *skb);
 228 /* The old interface to netif_rx(). */
 229 extern int              dev_rint(unsigned char *buff, long len, int flags,
 230                                  struct device * dev);
 231 extern void             dev_transmit(void);
 232 extern int              in_net_bh(void);
 233 extern void             net_bh(void *tmp);
 234 extern void             dev_tint(struct device *dev);
 235 extern int              dev_get_info(char *buffer, char **start, off_t offset, int length, int dummy);
 236 extern int              dev_ioctl(unsigned int cmd, void *);
 237 
 238 extern void             dev_init(void);
 239 
 240 /* Locking protection for page faults during outputs to devices unloaded during the fault */
 241 
 242 extern int              dev_lockct;
 243 
 244 /*
 245  *      These two dont currently need to be interrupt safe
 246  *      but they may do soon. Do it properly anyway.
 247  */
 248 
 249 extern __inline__ void  dev_lock_list(void)
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 250 {
 251         unsigned long flags;
 252         save_flags(flags);
 253         cli();
 254         dev_lockct++;
 255         restore_flags(flags);
 256 }
 257 
 258 extern __inline__ void  dev_unlock_list(void)
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 259 {
 260         unsigned long flags;
 261         save_flags(flags);
 262         cli();
 263         dev_lockct--;
 264         restore_flags(flags);
 265 }
 266 
 267 /*
 268  *      This almost never occurs, isnt in performance critical paths
 269  *      and we can thus be relaxed about it
 270  */
 271  
 272 extern __inline__ void dev_lock_wait(void)
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 273 {
 274         while(dev_lockct)
 275                 schedule();
 276 }
 277 
 278 
 279 /* These functions live elsewhere (drivers/net/net_init.c, but related) */
 280 
 281 extern void             ether_setup(struct device *dev);
 282 extern void             tr_setup(struct device *dev);
 283 extern int              ether_config(struct device *dev, struct ifmap *map);
 284 /* Support for loadable net-drivers */
 285 extern int              register_netdev(struct device *dev);
 286 extern void             unregister_netdev(struct device *dev);
 287 extern int              register_netdevice_notifier(struct notifier_block *nb);
 288 extern int              unregister_netdevice_notifier(struct notifier_block *nb);
 289 /* Functions used for multicast support */
 290 extern void             dev_mc_upload(struct device *dev);
 291 extern void             dev_mc_delete(struct device *dev, void *addr, int alen, int all);
 292 extern void             dev_mc_add(struct device *dev, void *addr, int alen, int newonly);
 293 extern void             dev_mc_discard(struct device *dev);
 294 /* This is the wrong place but it'll do for the moment */
 295 extern void             ip_mc_allhost(struct device *dev);
 296 #endif /* __KERNEL__ */
 297 
 298 #endif  /* _LINUX_DEV_H */

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