include/linux/inetdevice.h

   1 #ifndef _LINUX_INETDEVICE_H
   2 #define _LINUX_INETDEVICE_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/bitmap.h>
   7 #include <linux/if.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/rcupdate.h>
  10 #include <linux/timer.h>
  11 #include <linux/sysctl.h>
  12
  13 struct ipv4_devconf {
  14         void    *sysctl;
  15         int     data[__NET_IPV4_CONF_MAX - 1];
  16         DECLARE_BITMAP(state, __NET_IPV4_CONF_MAX - 1);
  17 };
  18
  19 struct in_device {
  20         struct net_device       *dev;
  21         atomic_t                refcnt;
  22         int                     dead;
  23         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  24         rwlock_t                mc_list_lock;
  25         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  26         int                     mc_count;                 /* Number of installed mcasts */
  27         spinlock_t              mc_tomb_lock;
  28         struct ip_mc_list       *mc_tomb;
  29         unsigned long           mr_v1_seen;
  30         unsigned long           mr_v2_seen;
  31         unsigned long           mr_maxdelay;
  32         unsigned char           mr_qrv;
  33         unsigned char           mr_gq_running;
  34         unsigned char           mr_ifc_count;
  35         struct timer_list       mr_gq_timer;    /* general query timer */
  36         struct timer_list       mr_ifc_timer;   /* interface change timer */
  37
  38         struct neigh_parms      *arp_parms;
  39         struct ipv4_devconf     cnf;
  40         struct rcu_head         rcu_head;
  41 };
  42
  43 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[NET_IPV4_CONF_ ## attr - 1])
  44 #define IPV4_DEVCONF_ALL(net, attr) \
  45         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  46
  47 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  48 {
  49         index--;
  50         return in_dev->cnf.data[index];
  51 }
  52
  53 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  54                                     int val)
  55 {
  56         index--;
  57         set_bit(index, in_dev->cnf.state);
  58         in_dev->cnf.data[index] = val;
  59 }
  60
  61 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  62 {
  63         bitmap_fill(in_dev->cnf.state, __NET_IPV4_CONF_MAX - 1);
  64 }
  65
  66 #define IN_DEV_CONF_GET(in_dev, attr) \
  67         ipv4_devconf_get((in_dev), NET_IPV4_CONF_ ## attr)
  68 #define IN_DEV_CONF_SET(in_dev, attr, val) \
  69         ipv4_devconf_set((in_dev), NET_IPV4_CONF_ ## attr, (val))
  70
  71 #define IN_DEV_ANDCONF(in_dev, attr) \
  72         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
  73          IN_DEV_CONF_GET((in_dev), attr))
  74 #define IN_DEV_ORCONF(in_dev, attr) \
  75         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \
  76          IN_DEV_CONF_GET((in_dev), attr))
  77 #define IN_DEV_MAXCONF(in_dev, attr) \
  78         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
  79              IN_DEV_CONF_GET((in_dev), attr)))
  80
  81 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
  82 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
  83 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
  84 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
  85                                                        ACCEPT_SOURCE_ROUTE)
  86 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
  87
  88 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
  89 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
  90 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
  91 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
  92 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
  93                                                       SECURE_REDIRECTS)
  94 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
  95 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
  96 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
  97                                         IN_DEV_ORCONF((in_dev), \
  98                                                       PROMOTE_SECONDARIES)
  99
 100 #define IN_DEV_RX_REDIRECTS(in_dev) \
 101         ((IN_DEV_FORWARD(in_dev) && \
 102           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 103          || (!IN_DEV_FORWARD(in_dev) && \
 104           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 105
 106 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 107 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 108 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 109 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 110
 111 struct in_ifaddr {
 112         struct in_ifaddr        *ifa_next;
 113         struct in_device        *ifa_dev;
 114         struct rcu_head         rcu_head;
 115         __be32                  ifa_local;
 116         __be32                  ifa_address;
 117         __be32                  ifa_mask;
 118         __be32                  ifa_broadcast;
 119         unsigned char           ifa_scope;
 120         unsigned char           ifa_flags;
 121         unsigned char           ifa_prefixlen;
 122         char                    ifa_label[IFNAMSIZ];
 123 };
 124
 125 extern int register_inetaddr_notifier(struct notifier_block *nb);
 126 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 127
 128 extern struct net_device *ip_dev_find(struct net *net, __be32 addr);
 129 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 130 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 131 extern void             devinet_init(void);
 132 extern struct in_device *inetdev_by_index(struct net *, int);
 133 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 134 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 135 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 136
 137 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 138 {
 139         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 140 }
 141
 142 /*
 143  *      Check if a mask is acceptable.
 144  */
 145
 146 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 147 {
 148         __u32 hmask;
 149         if (addr & (mask = ~mask))
 150                 return 1;
 151         hmask = ntohl(mask);
 152         if (hmask & (hmask+1))
 153                 return 1;
 154         return 0;
 155 }
 156
 157 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 158   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 159
 160 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 161   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 162
 163
 164 #define endfor_ifa(in_dev) }
 165
 166 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 167 {
 168         struct in_device *in_dev = dev->ip_ptr;
 169         if (in_dev)
 170                 in_dev = rcu_dereference(in_dev);
 171         return in_dev;
 172 }
 173
 174 static __inline__ struct in_device *
 175 in_dev_get(const struct net_device *dev)
 176 {
 177         struct in_device *in_dev;
 178
 179         rcu_read_lock();
 180         in_dev = __in_dev_get_rcu(dev);
 181         if (in_dev)
 182                 atomic_inc(&in_dev->refcnt);
 183         rcu_read_unlock();
 184         return in_dev;
 185 }
 186
 187 static __inline__ struct in_device *
 188 __in_dev_get_rtnl(const struct net_device *dev)
 189 {
 190         return (struct in_device*)dev->ip_ptr;
 191 }
 192
 193 extern void in_dev_finish_destroy(struct in_device *idev);
 194
 195 static inline void in_dev_put(struct in_device *idev)
 196 {
 197         if (atomic_dec_and_test(&idev->refcnt))
 198                 in_dev_finish_destroy(idev);
 199 }
 200
 201 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 202 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 203
 204 #endif /* __KERNEL__ */
 205
 206 static __inline__ __be32 inet_make_mask(int logmask)
 207 {
 208         if (logmask)
 209                 return htonl(~((1<<(32-logmask))-1));
 210         return 0;
 211 }
 212
 213 static __inline__ int inet_mask_len(__be32 mask)
 214 {
 215         __u32 hmask = ntohl(mask);
 216         if (!hmask)
 217                 return 0;
 218         return 32 - ffz(~hmask);
 219 }
 220
 221
 222 #endif /* _LINUX_INETDEVICE_H */