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/ip.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/rcupdate.h>
  11 #include <linux/timer.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/rtnetlink.h>
  14
  15 struct ipv4_devconf {
  16         void    *sysctl;
  17         int     data[IPV4_DEVCONF_MAX];
  18         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
  19 };
  20
  21 #define MC_HASH_SZ_LOG 9
  22
  23 struct in_device {
  24         struct net_device       *dev;
  25         atomic_t                refcnt;
  26         int                     dead;
  27         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  28
  29         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
  30         struct ip_mc_list __rcu * __rcu *mc_hash;
  31
  32         int                     mc_count;       /* Number of installed mcasts   */
  33         spinlock_t              mc_tomb_lock;
  34         struct ip_mc_list       *mc_tomb;
  35         unsigned long           mr_v1_seen;
  36         unsigned long           mr_v2_seen;
  37         unsigned long           mr_maxdelay;
  38         unsigned char           mr_qrv;
  39         unsigned char           mr_gq_running;
  40         unsigned char           mr_ifc_count;
  41         struct timer_list       mr_gq_timer;    /* general query timer */
  42         struct timer_list       mr_ifc_timer;   /* interface change timer */
  43
  44         struct neigh_parms      *arp_parms;
  45         struct ipv4_devconf     cnf;
  46         struct rcu_head         rcu_head;
  47 };
  48
  49 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
  50 #define IPV4_DEVCONF_ALL(net, attr) \
  51         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  52
  53 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  54 {
  55         index--;
  56         return in_dev->cnf.data[index];
  57 }
  58
  59 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  60                                     int val)
  61 {
  62         index--;
  63         set_bit(index, in_dev->cnf.state);
  64         in_dev->cnf.data[index] = val;
  65 }
  66
  67 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  68 {
  69         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
  70 }
  71
  72 #define IN_DEV_CONF_GET(in_dev, attr) \
  73         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
  74 #define IN_DEV_CONF_SET(in_dev, attr, val) \
  75         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
  76
  77 #define IN_DEV_ANDCONF(in_dev, attr) \
  78         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
  79          IN_DEV_CONF_GET((in_dev), attr))
  80
  81 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
  82         (IPV4_DEVCONF_ALL(net, attr) || \
  83          IN_DEV_CONF_GET((in_dev), attr))
  84
  85 #define IN_DEV_ORCONF(in_dev, attr) \
  86         IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
  87
  88 #define IN_DEV_MAXCONF(in_dev, attr) \
  89         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
  90              IN_DEV_CONF_GET((in_dev), attr)))
  91
  92 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
  93 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
  94 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
  95 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
  96 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
  97                                                        ACCEPT_SOURCE_ROUTE)
  98 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
  99 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
 100
 101 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
 102 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
 103 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
 104 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
 105 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
 106 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
 107                                                       SECURE_REDIRECTS)
 108 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
 109 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
 110 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
 111                                         IN_DEV_ORCONF((in_dev), \
 112                                                       PROMOTE_SECONDARIES)
 113 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
 114 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
 115         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
 116
 117 #define IN_DEV_RX_REDIRECTS(in_dev) \
 118         ((IN_DEV_FORWARD(in_dev) && \
 119           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 120          || (!IN_DEV_FORWARD(in_dev) && \
 121           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 122
 123 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
 124         IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
 125
 126 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 127 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
 128 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 129 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 130 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 131
 132 struct in_ifaddr {
 133         struct hlist_node       hash;
 134         struct in_ifaddr        *ifa_next;
 135         struct in_device        *ifa_dev;
 136         struct rcu_head         rcu_head;
 137         __be32                  ifa_local;
 138         __be32                  ifa_address;
 139         __be32                  ifa_mask;
 140         __be32                  ifa_broadcast;
 141         unsigned char           ifa_scope;
 142         unsigned char           ifa_prefixlen;
 143         __u32                   ifa_flags;
 144         char                    ifa_label[IFNAMSIZ];
 145
 146         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
 147         __u32                   ifa_valid_lft;
 148         __u32                   ifa_preferred_lft;
 149         unsigned long           ifa_cstamp; /* created timestamp */
 150         unsigned long           ifa_tstamp; /* updated timestamp */
 151 };
 152
 153 int register_inetaddr_notifier(struct notifier_block *nb);
 154 int unregister_inetaddr_notifier(struct notifier_block *nb);
 155
 156 void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
 157                                  struct ipv4_devconf *devconf);
 158
 159 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 160 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 161 {
 162         return __ip_dev_find(net, addr, true);
 163 }
 164
 165 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 166 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 167 void devinet_init(void);
 168 struct in_device *inetdev_by_index(struct net *, int);
 169 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 170 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
 171                          __be32 local, int scope);
 172 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 173                                     __be32 mask);
 174 static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 175 {
 176         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 177 }
 178
 179 /*
 180  *      Check if a mask is acceptable.
 181  */
 182
 183 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
 184 {
 185         __u32 hmask;
 186         if (addr & (mask = ~mask))
 187                 return true;
 188         hmask = ntohl(mask);
 189         if (hmask & (hmask+1))
 190                 return true;
 191         return false;
 192 }
 193
 194 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 195   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 196
 197 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 198   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 199
 200
 201 #define endfor_ifa(in_dev) }
 202
 203 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 204 {
 205         return rcu_dereference(dev->ip_ptr);
 206 }
 207
 208 static inline struct in_device *in_dev_get(const struct net_device *dev)
 209 {
 210         struct in_device *in_dev;
 211
 212         rcu_read_lock();
 213         in_dev = __in_dev_get_rcu(dev);
 214         if (in_dev)
 215                 atomic_inc(&in_dev->refcnt);
 216         rcu_read_unlock();
 217         return in_dev;
 218 }
 219
 220 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 221 {
 222         return rtnl_dereference(dev->ip_ptr);
 223 }
 224
 225 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
 226 {
 227         struct in_device *in_dev = __in_dev_get_rcu(dev);
 228
 229         return in_dev ? in_dev->arp_parms : NULL;
 230 }
 231
 232 void in_dev_finish_destroy(struct in_device *idev);
 233
 234 static inline void in_dev_put(struct in_device *idev)
 235 {
 236         if (atomic_dec_and_test(&idev->refcnt))
 237                 in_dev_finish_destroy(idev);
 238 }
 239
 240 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 241 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 242
 243 #endif /* __KERNEL__ */
 244
 245 static __inline__ __be32 inet_make_mask(int logmask)
 246 {
 247         if (logmask)
 248                 return htonl(~((1U<<(32-logmask))-1));
 249         return 0;
 250 }
 251
 252 static __inline__ int inet_mask_len(__be32 mask)
 253 {
 254         __u32 hmask = ntohl(mask);
 255         if (!hmask)
 256                 return 0;
 257         return 32 - ffz(~hmask);
 258 }
 259
 260
 261 #endif /* _LINUX_INETDEVICE_H */