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         int     arp_filter;
  21         int     medium_id;
  22         int     no_xfrm;
  23         int     no_policy;
  24         void    *sysctl;
  25 };
  26
  27 extern struct ipv4_devconf ipv4_devconf;
  28
  29 struct in_device
  30 {
  31         struct net_device               *dev;
  32         atomic_t                refcnt;
  33         rwlock_t                lock;
  34         int                     dead;
  35         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  36         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  37         rwlock_t                mc_lock;        /* for mc_tomb */
  38         struct ip_mc_list       *mc_tomb;
  39         unsigned long           mr_v1_seen;
  40         unsigned long           mr_v2_seen;
  41         unsigned long           mr_maxdelay;
  42         unsigned char           mr_qrv;
  43         unsigned char           mr_gq_running;
  44         unsigned char           mr_ifc_count;
  45         struct timer_list       mr_gq_timer;    /* general query timer */
  46         struct timer_list       mr_ifc_timer;   /* interface change timer */
  47
  48         struct neigh_parms      *arp_parms;
  49         struct ipv4_devconf     cnf;
  50 };
  51
  52 #define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
  53 #define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
  54 #define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
  55 #define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
  56 #define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
  57
  58 #define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
  59 #define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
  60 #define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
  61 #define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
  62 #define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
  63 #define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
  64 #define IN_DEV_MEDIUM_ID(in_dev)        ((in_dev)->cnf.medium_id)
  65
  66 #define IN_DEV_RX_REDIRECTS(in_dev) \
  67         ((IN_DEV_FORWARD(in_dev) && \
  68           (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
  69          || (!IN_DEV_FORWARD(in_dev) && \
  70           (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
  71
  72 #define IN_DEV_ARPFILTER(in_dev)        (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
  73
  74 struct in_ifaddr
  75 {
  76         struct in_ifaddr        *ifa_next;
  77         struct in_device        *ifa_dev;
  78         u32                     ifa_local;
  79         u32                     ifa_address;
  80         u32                     ifa_mask;
  81         u32                     ifa_broadcast;
  82         u32                     ifa_anycast;
  83         unsigned char           ifa_scope;
  84         unsigned char           ifa_flags;
  85         unsigned char           ifa_prefixlen;
  86         char                    ifa_label[IFNAMSIZ];
  87 };
  88
  89 extern int register_inetaddr_notifier(struct notifier_block *nb);
  90 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
  91
  92 extern struct net_device        *ip_dev_find(u32 addr);
  93 extern int              inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
  94 extern int              devinet_ioctl(unsigned int cmd, void *);
  95 extern void             devinet_init(void);
  96 extern struct in_device *inetdev_init(struct net_device *dev);
  97 extern struct in_device *inetdev_by_index(int);
  98 extern u32              inet_select_addr(const struct net_device *dev, u32 dst, int scope);
  99 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
 100 extern void             inet_forward_change(void);
 101
 102 static __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
 103 {
 104         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 105 }
 106
 107 /*
 108  *      Check if a mask is acceptable.
 109  */
 110
 111 static __inline__ int bad_mask(u32 mask, u32 addr)
 112 {
 113         if (addr & (mask = ~mask))
 114                 return 1;
 115         mask = ntohl(mask);
 116         if (mask & (mask+1))
 117                 return 1;
 118         return 0;
 119 }
 120
 121 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 122   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 123
 124 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 125   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 126
 127
 128 #define endfor_ifa(in_dev) }
 129
 130 extern rwlock_t inetdev_lock;
 131
 132
 133 static __inline__ struct in_device *
 134 in_dev_get(const struct net_device *dev)
 135 {
 136         struct in_device *in_dev;
 137
 138         read_lock(&inetdev_lock);
 139         in_dev = dev->ip_ptr;
 140         if (in_dev)
 141                 atomic_inc(&in_dev->refcnt);
 142         read_unlock(&inetdev_lock);
 143         return in_dev;
 144 }
 145
 146 static __inline__ struct in_device *
 147 __in_dev_get(const struct net_device *dev)
 148 {
 149         return (struct in_device*)dev->ip_ptr;
 150 }
 151
 152 extern void in_dev_finish_destroy(struct in_device *idev);
 153
 154 static __inline__ void
 155 in_dev_put(struct in_device *idev)
 156 {
 157         if (atomic_dec_and_test(&idev->refcnt))
 158                 in_dev_finish_destroy(idev);
 159 }
 160
 161 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 162 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 163
 164 #endif /* __KERNEL__ */
 165
 166 static __inline__ __u32 inet_make_mask(int logmask)
 167 {
 168         if (logmask)
 169                 return htonl(~((1<<(32-logmask))-1));
 170         return 0;
 171 }
 172
 173 static __inline__ int inet_mask_len(__u32 mask)
 174 {
 175         if (!(mask = ntohl(mask)))
 176                 return 0;
 177         return 32 - ffz(~mask);
 178 }
 179
 180
 181 #endif /* _LINUX_INETDEVICE_H */