inetdevice.h

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#ifndef _LINUX_INETDEVICE_H
#define _LINUX_INETDEVICE_H

#ifdef __KERNEL__

struct ipv4_devconf
{
        int     accept_redirects;
        int     send_redirects;
        int     secure_redirects;
        int     shared_media;
        int     accept_source_route;
        int     rp_filter;
        int     proxy_arp;
        int     bootp_relay;
        int     log_martians;
        int     forwarding;
        int     mc_forwarding;
        int     tag;
        int     arp_filter;
        int     medium_id;
        int     loop;
        void    *sysctl;
};

extern struct ipv4_devconf ipv4_devconf;

struct in_device
{
        struct net_device               *dev;
        atomic_t                refcnt;
        rwlock_t                lock;
        int                     dead;
        struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
        struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
        rwlock_t                mc_lock;        /* for mc_tomb */
        struct ip_mc_list       *mc_tomb;
        unsigned long           mr_v1_seen;
        unsigned long           mr_v2_seen;
        unsigned long           mr_maxdelay;
        unsigned char           mr_qrv;
        unsigned char           mr_gq_running;
        unsigned char           mr_ifc_count;
        struct timer_list       mr_gq_timer;    /* general query timer */
        struct timer_list       mr_ifc_timer;   /* interface change timer */

        struct neigh_parms      *arp_parms;
        struct ipv4_devconf     cnf;
};

#define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
#define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
#define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
#define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
#define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)

#define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
#define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
#define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
#define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
#define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
#define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
#define IN_DEV_MEDIUM_ID(in_dev)        ((in_dev)->cnf.medium_id)

#define IN_DEV_RX_REDIRECTS(in_dev) \
        ((IN_DEV_FORWARD(in_dev) && \
          (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
         || (!IN_DEV_FORWARD(in_dev) && \
          (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))

#define IN_DEV_ARPFILTER(in_dev)        (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
#define IN_DEV_LOOP(in_dev)     ((in_dev)->cnf.loop)

struct in_ifaddr
{
        struct in_ifaddr        *ifa_next;
        struct in_device        *ifa_dev;
        u32                     ifa_local;
        u32                     ifa_address;
        u32                     ifa_mask;
        u32                     ifa_broadcast;
        u32                     ifa_anycast;
        unsigned char           ifa_scope;
        unsigned char           ifa_flags;
        unsigned char           ifa_prefixlen;
        char                    ifa_label[IFNAMSIZ];
};

extern int register_inetaddr_notifier(struct notifier_block *nb);
extern int unregister_inetaddr_notifier(struct notifier_block *nb);

extern struct net_device        *ip_dev_find(u32 addr);
extern int              inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
extern int              devinet_ioctl(unsigned int cmd, void *);
extern void             devinet_init(void);
extern struct in_device *inetdev_init(struct net_device *dev);
extern struct in_device *inetdev_by_index(int);
extern u32              inet_select_addr(const struct net_device *dev, u32 dst, int scope);
extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
extern void             inet_forward_change(void);

static __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
{
        return !((addr^ifa->ifa_address)&ifa->ifa_mask);
}

/*
 *      Check if a mask is acceptable.
 */
 
static __inline__ int bad_mask(u32 mask, u32 addr)
{
        if (addr & (mask = ~mask))
                return 1;
        mask = ntohl(mask);
        if (mask & (mask+1))
                return 1;
        return 0;
}

#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)

#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)


#define endfor_ifa(in_dev) }

extern rwlock_t inetdev_lock;


static __inline__ struct in_device *
in_dev_get(const struct net_device *dev)
{
        struct in_device *in_dev;

        read_lock(&inetdev_lock);
        in_dev = dev->ip_ptr;
        if (in_dev)
                atomic_inc(&in_dev->refcnt);
        read_unlock(&inetdev_lock);
        return in_dev;
}

static __inline__ struct in_device *
__in_dev_get(const struct net_device *dev)
{
        return (struct in_device*)dev->ip_ptr;
}

extern void in_dev_finish_destroy(struct in_device *idev);

static __inline__ void
in_dev_put(struct in_device *idev)
{
        if (atomic_dec_and_test(&idev->refcnt))
                in_dev_finish_destroy(idev);
}

#define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
#define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)

#endif /* __KERNEL__ */

static __inline__ __u32 inet_make_mask(int logmask)
{
        if (logmask)
                return htonl(~((1<<(32-logmask))-1));
        return 0;
}

static __inline__ int inet_mask_len(__u32 mask)
{
        if (!(mask = ntohl(mask)))
                return 0;
        return 32 - ffz(~mask);
}


#endif /* _LINUX_INETDEVICE_H */

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