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 #include <linux/rtnetlink.h>
  13
  14 enum
  15 {
  16         IPV4_DEVCONF_FORWARDING=1,
  17         IPV4_DEVCONF_MC_FORWARDING,
  18         IPV4_DEVCONF_PROXY_ARP,
  19         IPV4_DEVCONF_ACCEPT_REDIRECTS,
  20         IPV4_DEVCONF_SECURE_REDIRECTS,
  21         IPV4_DEVCONF_SEND_REDIRECTS,
  22         IPV4_DEVCONF_SHARED_MEDIA,
  23         IPV4_DEVCONF_RP_FILTER,
  24         IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
  25         IPV4_DEVCONF_BOOTP_RELAY,
  26         IPV4_DEVCONF_LOG_MARTIANS,
  27         IPV4_DEVCONF_TAG,
  28         IPV4_DEVCONF_ARPFILTER,
  29         IPV4_DEVCONF_MEDIUM_ID,
  30         IPV4_DEVCONF_NOXFRM,
  31         IPV4_DEVCONF_NOPOLICY,
  32         IPV4_DEVCONF_FORCE_IGMP_VERSION,
  33         IPV4_DEVCONF_ARP_ANNOUNCE,
  34         IPV4_DEVCONF_ARP_IGNORE,
  35         IPV4_DEVCONF_PROMOTE_SECONDARIES,
  36         IPV4_DEVCONF_ARP_ACCEPT,
  37         IPV4_DEVCONF_ARP_NOTIFY,
  38         IPV4_DEVCONF_ACCEPT_LOCAL,
  39         IPV4_DEVCONF_SRC_VMARK,
  40         IPV4_DEVCONF_PROXY_ARP_PVLAN,
  41         __IPV4_DEVCONF_MAX
  42 };
  43
  44 struct ipv4_devconf {
  45         void    *sysctl;
  46         int     data[__IPV4_DEVCONF_MAX - 1];
  47         DECLARE_BITMAP(state, __IPV4_DEVCONF_MAX - 1);
  48 };
  49
  50 struct in_device {
  51         struct net_device       *dev;
  52         atomic_t                refcnt;
  53         int                     dead;
  54         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  55         rwlock_t                mc_list_lock;
  56         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  57         int                     mc_count;                 /* Number of installed mcasts */
  58         spinlock_t              mc_tomb_lock;
  59         struct ip_mc_list       *mc_tomb;
  60         unsigned long           mr_v1_seen;
  61         unsigned long           mr_v2_seen;
  62         unsigned long           mr_maxdelay;
  63         unsigned char           mr_qrv;
  64         unsigned char           mr_gq_running;
  65         unsigned char           mr_ifc_count;
  66         struct timer_list       mr_gq_timer;    /* general query timer */
  67         struct timer_list       mr_ifc_timer;   /* interface change timer */
  68
  69         struct neigh_parms      *arp_parms;
  70         struct ipv4_devconf     cnf;
  71         struct rcu_head         rcu_head;
  72 };
  73
  74 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
  75 #define IPV4_DEVCONF_ALL(net, attr) \
  76         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  77
  78 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  79 {
  80         index--;
  81         return in_dev->cnf.data[index];
  82 }
  83
  84 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  85                                     int val)
  86 {
  87         index--;
  88         set_bit(index, in_dev->cnf.state);
  89         in_dev->cnf.data[index] = val;
  90 }
  91
  92 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  93 {
  94         bitmap_fill(in_dev->cnf.state, __IPV4_DEVCONF_MAX - 1);
  95 }
  96
  97 #define IN_DEV_CONF_GET(in_dev, attr) \
  98         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
  99 #define IN_DEV_CONF_SET(in_dev, attr, val) \
 100         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
 101
 102 #define IN_DEV_ANDCONF(in_dev, attr) \
 103         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
 104          IN_DEV_CONF_GET((in_dev), attr))
 105 #define IN_DEV_ORCONF(in_dev, attr) \
 106         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \
 107          IN_DEV_CONF_GET((in_dev), attr))
 108 #define IN_DEV_MAXCONF(in_dev, attr) \
 109         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
 110              IN_DEV_CONF_GET((in_dev), attr)))
 111
 112 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
 113 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
 114 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
 115 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
 116 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
 117                                                        ACCEPT_SOURCE_ROUTE)
 118 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
 119 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
 120
 121 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
 122 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
 123 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
 124 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
 125 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
 126 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
 127                                                       SECURE_REDIRECTS)
 128 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
 129 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
 130 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
 131                                         IN_DEV_ORCONF((in_dev), \
 132                                                       PROMOTE_SECONDARIES)
 133
 134 #define IN_DEV_RX_REDIRECTS(in_dev) \
 135         ((IN_DEV_FORWARD(in_dev) && \
 136           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 137          || (!IN_DEV_FORWARD(in_dev) && \
 138           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 139
 140 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 141 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 142 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 143 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 144
 145 struct in_ifaddr {
 146         struct in_ifaddr        *ifa_next;
 147         struct in_device        *ifa_dev;
 148         struct rcu_head         rcu_head;
 149         __be32                  ifa_local;
 150         __be32                  ifa_address;
 151         __be32                  ifa_mask;
 152         __be32                  ifa_broadcast;
 153         unsigned char           ifa_scope;
 154         unsigned char           ifa_flags;
 155         unsigned char           ifa_prefixlen;
 156         char                    ifa_label[IFNAMSIZ];
 157 };
 158
 159 extern int register_inetaddr_notifier(struct notifier_block *nb);
 160 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 161
 162 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 163 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 164 {
 165         return __ip_dev_find(net, addr, true);
 166 }
 167
 168 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 169 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 170 extern void             devinet_init(void);
 171 extern struct in_device *inetdev_by_index(struct net *, int);
 172 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 173 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 174 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 175
 176 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 177 {
 178         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 179 }
 180
 181 /*
 182  *      Check if a mask is acceptable.
 183  */
 184
 185 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 186 {
 187         __u32 hmask;
 188         if (addr & (mask = ~mask))
 189                 return 1;
 190         hmask = ntohl(mask);
 191         if (hmask & (hmask+1))
 192                 return 1;
 193         return 0;
 194 }
 195
 196 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 197   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 198
 199 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 200   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 201
 202
 203 #define endfor_ifa(in_dev) }
 204
 205 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 206 {
 207         return rcu_dereference(dev->ip_ptr);
 208 }
 209
 210 static inline struct in_device *in_dev_get(const struct net_device *dev)
 211 {
 212         struct in_device *in_dev;
 213
 214         rcu_read_lock();
 215         in_dev = __in_dev_get_rcu(dev);
 216         if (in_dev)
 217                 atomic_inc(&in_dev->refcnt);
 218         rcu_read_unlock();
 219         return in_dev;
 220 }
 221
 222 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 223 {
 224         return rcu_dereference_check(dev->ip_ptr, lockdep_rtnl_is_held());
 225 }
 226
 227 extern void in_dev_finish_destroy(struct in_device *idev);
 228
 229 static inline void in_dev_put(struct in_device *idev)
 230 {
 231         if (atomic_dec_and_test(&idev->refcnt))
 232                 in_dev_finish_destroy(idev);
 233 }
 234
 235 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 236 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 237
 238 #endif /* __KERNEL__ */
 239
 240 static __inline__ __be32 inet_make_mask(int logmask)
 241 {
 242         if (logmask)
 243                 return htonl(~((1<<(32-logmask))-1));
 244         return 0;
 245 }
 246
 247 static __inline__ int inet_mask_len(__be32 mask)
 248 {
 249         __u32 hmask = ntohl(mask);
 250         if (!hmask)
 251                 return 0;
 252         return 32 - ffz(~hmask);
 253 }
 254
 255
 256 #endif /* _LINUX_INETDEVICE_H */