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 {
  15         void    *sysctl;
  16         int     data[__NET_IPV4_CONF_MAX - 1];
  17         DECLARE_BITMAP(state, __NET_IPV4_CONF_MAX - 1);
  18 };
  19
  20 extern struct ipv4_devconf ipv4_devconf;
  21
  22 struct in_device
  23 {
  24         struct net_device       *dev;
  25         atomic_t                refcnt;
  26         int                     dead;
  27         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  28         rwlock_t                mc_list_lock;
  29         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  30         spinlock_t              mc_tomb_lock;
  31         struct ip_mc_list       *mc_tomb;
  32         unsigned long           mr_v1_seen;
  33         unsigned long           mr_v2_seen;
  34         unsigned long           mr_maxdelay;
  35         unsigned char           mr_qrv;
  36         unsigned char           mr_gq_running;
  37         unsigned char           mr_ifc_count;
  38         struct timer_list       mr_gq_timer;    /* general query timer */
  39         struct timer_list       mr_ifc_timer;   /* interface change timer */
  40
  41         struct neigh_parms      *arp_parms;
  42         struct ipv4_devconf     cnf;
  43         struct rcu_head         rcu_head;
  44 };
  45
  46 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[NET_IPV4_CONF_ ## attr - 1])
  47 #define IPV4_DEVCONF_ALL(net, attr) \
  48         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  49
  50 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  51 {
  52         index--;
  53         return in_dev->cnf.data[index];
  54 }
  55
  56 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  57                                     int val)
  58 {
  59         index--;
  60         set_bit(index, in_dev->cnf.state);
  61         in_dev->cnf.data[index] = val;
  62 }
  63
  64 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  65 {
  66         bitmap_fill(in_dev->cnf.state, __NET_IPV4_CONF_MAX - 1);
  67 }
  68
  69 #define IN_DEV_CONF_GET(in_dev, attr) \
  70         ipv4_devconf_get((in_dev), NET_IPV4_CONF_ ## attr)
  71 #define IN_DEV_CONF_SET(in_dev, attr, val) \
  72         ipv4_devconf_set((in_dev), NET_IPV4_CONF_ ## attr, (val))
  73
  74 #define IN_DEV_ANDCONF(in_dev, attr) \
  75         (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr) && \
  76          IN_DEV_CONF_GET((in_dev), attr))
  77 #define IN_DEV_ORCONF(in_dev, attr) \
  78         (IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr) || \
  79          IN_DEV_CONF_GET((in_dev), attr))
  80 #define IN_DEV_MAXCONF(in_dev, attr) \
  81         (max(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, attr), \
  82              IN_DEV_CONF_GET((in_dev), attr)))
  83
  84 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
  85 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
  86 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_ANDCONF((in_dev), RP_FILTER)
  87 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
  88                                                        ACCEPT_SOURCE_ROUTE)
  89 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
  90
  91 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
  92 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
  93 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
  94 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
  95 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
  96                                                       SECURE_REDIRECTS)
  97 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
  98 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
  99 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
 100                                         IN_DEV_ORCONF((in_dev), \
 101                                                       PROMOTE_SECONDARIES)
 102
 103 #define IN_DEV_RX_REDIRECTS(in_dev) \
 104         ((IN_DEV_FORWARD(in_dev) && \
 105           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 106          || (!IN_DEV_FORWARD(in_dev) && \
 107           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 108
 109 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 110 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 111 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 112
 113 struct in_ifaddr
 114 {
 115         struct in_ifaddr        *ifa_next;
 116         struct in_device        *ifa_dev;
 117         struct rcu_head         rcu_head;
 118         __be32                  ifa_local;
 119         __be32                  ifa_address;
 120         __be32                  ifa_mask;
 121         __be32                  ifa_broadcast;
 122         __be32                  ifa_anycast;
 123         unsigned char           ifa_scope;
 124         unsigned char           ifa_flags;
 125         unsigned char           ifa_prefixlen;
 126         char                    ifa_label[IFNAMSIZ];
 127 };
 128
 129 extern int register_inetaddr_notifier(struct notifier_block *nb);
 130 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 131
 132 extern struct net_device        *ip_dev_find(__be32 addr);
 133 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 134 extern int              devinet_ioctl(unsigned int cmd, void __user *);
 135 extern void             devinet_init(void);
 136 extern struct in_device *inetdev_by_index(int);
 137 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 138 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 139 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 140
 141 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 142 {
 143         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 144 }
 145
 146 /*
 147  *      Check if a mask is acceptable.
 148  */
 149
 150 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 151 {
 152         __u32 hmask;
 153         if (addr & (mask = ~mask))
 154                 return 1;
 155         hmask = ntohl(mask);
 156         if (hmask & (hmask+1))
 157                 return 1;
 158         return 0;
 159 }
 160
 161 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 162   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 163
 164 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 165   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 166
 167
 168 #define endfor_ifa(in_dev) }
 169
 170 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 171 {
 172         struct in_device *in_dev = dev->ip_ptr;
 173         if (in_dev)
 174                 in_dev = rcu_dereference(in_dev);
 175         return in_dev;
 176 }
 177
 178 static __inline__ struct in_device *
 179 in_dev_get(const struct net_device *dev)
 180 {
 181         struct in_device *in_dev;
 182
 183         rcu_read_lock();
 184         in_dev = __in_dev_get_rcu(dev);
 185         if (in_dev)
 186                 atomic_inc(&in_dev->refcnt);
 187         rcu_read_unlock();
 188         return in_dev;
 189 }
 190
 191 static __inline__ struct in_device *
 192 __in_dev_get_rtnl(const struct net_device *dev)
 193 {
 194         return (struct in_device*)dev->ip_ptr;
 195 }
 196
 197 extern void in_dev_finish_destroy(struct in_device *idev);
 198
 199 static inline void in_dev_put(struct in_device *idev)
 200 {
 201         if (atomic_dec_and_test(&idev->refcnt))
 202                 in_dev_finish_destroy(idev);
 203 }
 204
 205 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 206 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 207
 208 #endif /* __KERNEL__ */
 209
 210 static __inline__ __be32 inet_make_mask(int logmask)
 211 {
 212         if (logmask)
 213                 return htonl(~((1<<(32-logmask))-1));
 214         return 0;
 215 }
 216
 217 static __inline__ int inet_mask_len(__be32 mask)
 218 {
 219         __u32 hmask = ntohl(mask);
 220         if (!hmask)
 221                 return 0;
 222         return 32 - ffz(~hmask);
 223 }
 224
 225
 226 #endif /* _LINUX_INETDEVICE_H */