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