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[/] [or1k_old/] [trunk/] [rc203soc/] [sw/] [uClinux/] [include/] [linux/] [net_alias.h] - Blame information for rev 1782

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1 1633 jcastillo 
/*
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 *              NET_ALIAS network device aliasing definitions.
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 *
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 *
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 * Version:     @(#)net_alias.h 0.50   4/20/97
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 *
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 * Author:      Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar>
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 *
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 *
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 *      This program is free software; you can redistribute it and/or
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 *      modify it under the terms of the GNU General Public License
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 *      as published by the Free Software Foundation; either version
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 *      2 of the License, or (at your option) any later version.
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 *
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 * Fixes:
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 *      Juan Jose Ciarlante     :       Added tx/rx stats for aliases.
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 *      Juan Jose Ciarlante     :       hash_tab size now in net_alias.c
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 *      Juan Jose Ciarlante     :       added sysctl interface
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 */
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#ifndef _NET_ALIAS_H
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#define _NET_ALIAS_H
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#include <linux/types.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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struct net_alias;
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struct net_alias_info;
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struct net_alias_type;
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/*
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 * main alias structure
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 * note that *defines* dev & devname
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 */
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struct net_alias
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{
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  struct device dev;            /* alias device defn*/
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  char name[IFNAMSIZ];          /* device name defn */
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  unsigned hash;                /* my hash value: for quick rehash */
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  unsigned slot;                /* slot number */
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  void *data;                   /* private data */
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  struct device *main_dev;      /* pointer to main device */
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  struct net_alias_type *nat;   /* alias type object bound */
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  struct net_alias *next;       /* next alias (hashed linked list) */
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  unsigned long rx_lookups;     /* 'fake' rx pkts */
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  unsigned long tx_lookups;     /* 'fake' tx pkts */
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};
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/*
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 *  alias structure pointed by main device
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 *  it holds main device's alias hash table
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 */
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struct net_alias_info
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{
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  int n_aliases;                /* num aliases */
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  int truesize;                 /* actual malloc size for struct + hashtab */
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  struct device *taildev;       /* my last (alias) device */
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  int max_aliases;              /* max aliases allowed for main device */
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  unsigned hash_tab_size;       /* hash_tab size in elements */
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  struct net_alias *hash_tab[0]; /* hashed alias table */
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};
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/*
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 * net_alias_type class
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 * declares a generic (AF_ independent) structure that will
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 * manage generic to family-specific behavior.
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 */
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struct net_alias_type
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{
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  int type;                     /* aliasing type: address family */
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  int n_attach;                 /* number of aliases attached */
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  char name[16];                /* af_name */
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  __u32 (*get_addr32)           /* get __u32 addr 'representation'*/
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    (struct net_alias_type *this, struct sockaddr*);
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  int (*dev_addr_chk)           /* address checking func: */
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    (struct net_alias_type *this, struct device *, struct sockaddr *);
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  struct device * (*dev_select) /* closest alias selector*/
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    (struct net_alias_type *this, struct device *, struct sockaddr *sa);
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  int (*alias_init_1)           /* called after alias creation: */
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    (struct net_alias_type *this,struct net_alias *alias, struct sockaddr *sa);
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  int (*alias_done_1)           /* called before alias deletion */
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    (struct net_alias_type *this, struct net_alias *alias);
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  int (*alias_print_1)
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    (struct net_alias_type *this, struct net_alias *alias, char *buf, int len);
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  struct net_alias_type *next;  /* link */
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};
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/*
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 * is dev an alias?
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 */
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static __inline__ int
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net_alias_is(struct device *dev)
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{
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  return (dev->my_alias != NULL);
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}
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/*
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 * does dev have aliases?
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 */
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static __inline__ int
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net_alias_has(struct device *dev)
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{
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  return (dev->alias_info != NULL);
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}
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/*
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 *      Initialise net_alias module
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 */
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extern void net_alias_init(void);
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/*
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 *      dev_get() with added aliasing magic
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 */
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extern struct device * net_alias_dev_get(char *dev_name, int aliasing_ok, int *err, struct sockaddr *sa, void *data);
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extern int net_alias_dev_rehash(struct device *dev, struct sockaddr *sa);
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/*
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 *      PROC_FS entries
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 */
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extern int net_alias_getinfo(char *buf, char **, off_t , int , int );
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extern int net_alias_types_getinfo(char *buf, char **, off_t , int , int );
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/*
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 *      net_alias_type (address family) registration
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 */
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extern int register_net_alias_type(struct net_alias_type *nat, int type);
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extern int unregister_net_alias_type(struct net_alias_type *nat);
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/*
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 *      get alias device _with_ specified address
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 */
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extern struct device * net_alias_dev_chk(struct device *main_dev, struct sockaddr *sa, int flags_on, int flags_off);
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extern struct device * net_alias_dev_chk32(struct device *main_dev, int family, __u32 addr32, int flags_on, int flags_off);
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/*
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 *      get 'closest' device to specified address (returns main_dev if
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 *      nothing better)
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 *      if succesfull, also increment rx stats.
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 */
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extern struct device * net_alias_dev_rx(struct device *main_dev, struct sockaddr *sa_src, struct sockaddr *sa_dst);
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extern struct device * net_alias_dev_rx32(struct device *main_dev, int family, __u32 src, __u32 dst);
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/*
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 * returns MY 'true' main device
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 * intended for alias devices
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 */
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static __inline__ struct device *net_alias_main_dev(struct device *dev)
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{
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  return (net_alias_is(dev))? dev->my_alias->main_dev : dev;
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}
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/*
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 * returns NEXT 'true' device
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 * intended for true devices
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 */
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static __inline__ struct device *
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net_alias_nextdev(struct device *dev)
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{
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  return (dev->alias_info)? dev->alias_info->taildev->next : dev->next;
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}
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/*
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 * sets NEXT 'true' device
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 * intended for main devices (treat main device as block: dev+aliases).
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 */
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static __inline__ struct device *
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net_alias_nextdev_set(struct device *dev, struct device *nextdev)
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{
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  struct device *pdev = dev;
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  if (net_alias_has(dev))
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  {
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    pdev = dev->alias_info->taildev; /* point to last dev alias */
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  }
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  pdev->next = nextdev;
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  return nextdev;
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}
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/*
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 *      lookup counters (used for alias devices stats)
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 */
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static __inline__ void net_alias_inc_rx(struct net_alias *alias)
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{
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        if (alias != NULL) alias->rx_lookups++;
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}
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static __inline__ void net_alias_inc_tx(struct net_alias *alias)
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{
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        if (alias != NULL) alias->tx_lookups++;
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}
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/*
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 *      To be called when passing down a pkt, to _switch_ from alias device
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 *      to actual device, also incr. alias tx counter.
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 */
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static __inline__ struct device *net_alias_dev_tx(struct device *dev)
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{
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        struct net_alias *alias = dev->my_alias;
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        if (alias) {
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                net_alias_inc_tx(alias);
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                return alias->main_dev;
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        }
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        return dev;
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}
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#endif  /* _NET_ALIAS_H */

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