include/linux/inetdevice.h

   1 #ifndef _LINUX_INETDEVICE_H
   2 #define _LINUX_INETDEVICE_H
   3
   4 #ifdef __KERNEL__
   5
   6 struct ipv4_devconf
   7 {
   8         int     accept_redirects;
   9         int     send_redirects;
  10         int     secure_redirects;
  11         int     shared_media;
  12         int     accept_source_route;
  13         int     rp_filter;
  14         int     proxy_arp;
  15         int     bootp_relay;
  16         int     log_martians;
  17         int     forwarding;
  18         int     mc_forwarding;
  19         int     tag;
  20         void    *sysctl;
  21 };
  22
  23 extern struct ipv4_devconf ipv4_devconf;
  24
  25 struct in_device
  26 {
  27         struct net_device               *dev;
  28         atomic_t                refcnt;
  29         rwlock_t                lock;
  30         int                     dead;
  31         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  32         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  33         unsigned long           mr_v1_seen;
  34         struct neigh_parms      *arp_parms;
  35         struct ipv4_devconf     cnf;
  36 };
  37
  38 #define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
  39 #define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
  40 #define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
  41 #define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
  42 #define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
  43
  44 #define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
  45 #define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
  46 #define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
  47 #define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
  48 #define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
  49 #define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
  50
  51 #define IN_DEV_RX_REDIRECTS(in_dev) \
  52         ((IN_DEV_FORWARD(in_dev) && \
  53           (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
  54          || (!IN_DEV_FORWARD(in_dev) && \
  55           (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
  56
  57 struct in_ifaddr
  58 {
  59         struct in_ifaddr        *ifa_next;
  60         struct in_device        *ifa_dev;
  61         u32                     ifa_local;
  62         u32                     ifa_address;
  63         u32                     ifa_mask;
  64         u32                     ifa_broadcast;
  65         u32                     ifa_anycast;
  66         unsigned char           ifa_scope;
  67         unsigned char           ifa_flags;
  68         unsigned char           ifa_prefixlen;
  69         char                    ifa_label[IFNAMSIZ];
  70 };
  71
  72 extern int register_inetaddr_notifier(struct notifier_block *nb);
  73 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
  74
  75 extern struct net_device        *ip_dev_find(u32 addr);
  76 extern int              inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
  77 extern int              devinet_ioctl(unsigned int cmd, void *);
  78 extern void             devinet_init(void);
  79 extern struct in_device *inetdev_init(struct net_device *dev);
  80 extern struct in_device *inetdev_by_index(int);
  81 extern u32              inet_select_addr(const struct net_device *dev, u32 dst, int scope);
  82 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
  83 extern void             inet_forward_change(void);
  84
  85 extern __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
  86 {
  87         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
  88 }
  89
  90 /*
  91  *      Check if a mask is acceptable.
  92  */
  93
  94 extern __inline__ int bad_mask(u32 mask, u32 addr)
  95 {
  96         if (addr & (mask = ~mask))
  97                 return 1;
  98         mask = ntohl(mask);
  99         if (mask & (mask+1))
 100                 return 1;
 101         return 0;
 102 }
 103
 104 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 105   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 106
 107 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 108   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 109
 110
 111 #define endfor_ifa(in_dev) }
 112
 113 extern rwlock_t inetdev_lock;
 114
 115
 116 extern __inline__ struct in_device *
 117 in_dev_get(const struct net_device *dev)
 118 {
 119         struct in_device *in_dev;
 120
 121         read_lock(&inetdev_lock);
 122         in_dev = dev->ip_ptr;
 123         if (in_dev)
 124                 atomic_inc(&in_dev->refcnt);
 125         read_unlock(&inetdev_lock);
 126         return in_dev;
 127 }
 128
 129 extern __inline__ struct in_device *
 130 __in_dev_get(const struct net_device *dev)
 131 {
 132         return (struct in_device*)dev->ip_ptr;
 133 }
 134
 135 extern void in_dev_finish_destroy(struct in_device *idev);
 136
 137 extern __inline__ void
 138 in_dev_put(struct in_device *idev)
 139 {
 140         if (atomic_dec_and_test(&idev->refcnt))
 141                 in_dev_finish_destroy(idev);
 142 }
 143
 144 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 145 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 146
 147 #endif /* __KERNEL__ */
 148
 149 extern __inline__ __u32 inet_make_mask(int logmask)
 150 {
 151         if (logmask)
 152                 return htonl(~((1<<(32-logmask))-1));
 153         return 0;
 154 }
 155
 156 extern __inline__ int inet_mask_len(__u32 mask)
 157 {
 158         if (!(mask = ntohl(mask)))
 159                 return 0;
 160         return 32 - ffz(~mask);
 161 }
 162
 163
 164 #endif /* _LINUX_INETDEVICE_H */