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_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
  87 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
  88
  89 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
  90 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
  91 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
  92 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
  93 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
  94                                                       SECURE_REDIRECTS)
  95 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
  96 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
  97 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
  98                                         IN_DEV_ORCONF((in_dev), \
  99                                                       PROMOTE_SECONDARIES)
 100
 101 #define IN_DEV_RX_REDIRECTS(in_dev) \
 102         ((IN_DEV_FORWARD(in_dev) && \
 103           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 104          || (!IN_DEV_FORWARD(in_dev) && \
 105           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 106
 107 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 108 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 109 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 110 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 111
 112 struct in_ifaddr {
 113         struct in_ifaddr        *ifa_next;
 114         struct in_device        *ifa_dev;
 115         struct rcu_head         rcu_head;
 116         __be32                  ifa_local;
 117         __be32                  ifa_address;
 118         __be32                  ifa_mask;
 119         __be32                  ifa_broadcast;
 120         unsigned char           ifa_scope;
 121         unsigned char           ifa_flags;
 122         unsigned char           ifa_prefixlen;
 123         char                    ifa_label[IFNAMSIZ];
 124 };
 125
 126 extern int register_inetaddr_notifier(struct notifier_block *nb);
 127 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 128
 129 extern struct net_device *ip_dev_find(struct net *net, __be32 addr);
 130 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 131 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 132 extern void             devinet_init(void);
 133 extern struct in_device *inetdev_by_index(struct net *, int);
 134 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 135 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 136 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 137
 138 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 139 {
 140         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 141 }
 142
 143 /*
 144  *      Check if a mask is acceptable.
 145  */
 146
 147 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 148 {
 149         __u32 hmask;
 150         if (addr & (mask = ~mask))
 151                 return 1;
 152         hmask = ntohl(mask);
 153         if (hmask & (hmask+1))
 154                 return 1;
 155         return 0;
 156 }
 157
 158 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 159   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 160
 161 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 162   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 163
 164
 165 #define endfor_ifa(in_dev) }
 166
 167 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 168 {
 169         struct in_device *in_dev = dev->ip_ptr;
 170         if (in_dev)
 171                 in_dev = rcu_dereference(in_dev);
 172         return in_dev;
 173 }
 174
 175 static __inline__ struct in_device *
 176 in_dev_get(const struct net_device *dev)
 177 {
 178         struct in_device *in_dev;
 179
 180         rcu_read_lock();
 181         in_dev = __in_dev_get_rcu(dev);
 182         if (in_dev)
 183                 atomic_inc(&in_dev->refcnt);
 184         rcu_read_unlock();
 185         return in_dev;
 186 }
 187
 188 static __inline__ struct in_device *
 189 __in_dev_get_rtnl(const struct net_device *dev)
 190 {
 191         return (struct in_device*)dev->ip_ptr;
 192 }
 193
 194 extern void in_dev_finish_destroy(struct in_device *idev);
 195
 196 static inline void in_dev_put(struct in_device *idev)
 197 {
 198         if (atomic_dec_and_test(&idev->refcnt))
 199                 in_dev_finish_destroy(idev);
 200 }
 201
 202 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 203 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 204
 205 #endif /* __KERNEL__ */
 206
 207 static __inline__ __be32 inet_make_mask(int logmask)
 208 {
 209         if (logmask)
 210                 return htonl(~((1<<(32-logmask))-1));
 211         return 0;
 212 }
 213
 214 static __inline__ int inet_mask_len(__be32 mask)
 215 {
 216         __u32 hmask = ntohl(mask);
 217         if (!hmask)
 218                 return 0;
 219         return 32 - ffz(~hmask);
 220 }
 221
 222
 223 #endif /* _LINUX_INETDEVICE_H */