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 #include <linux/refcount.h>
  15
  16 struct ipv4_devconf {
  17         void    *sysctl;
  18         int     data[IPV4_DEVCONF_MAX];
  19         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
  20 };
  21
  22 #define MC_HASH_SZ_LOG 9
  23
  24 struct in_device {
  25         struct net_device       *dev;
  26         refcount_t              refcnt;
  27         int                     dead;
  28         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  29
  30         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
  31         struct ip_mc_list __rcu * __rcu *mc_hash;
  32
  33         int                     mc_count;       /* Number of installed mcasts   */
  34         spinlock_t              mc_tomb_lock;
  35         struct ip_mc_list       *mc_tomb;
  36         unsigned long           mr_v1_seen;
  37         unsigned long           mr_v2_seen;
  38         unsigned long           mr_maxdelay;
  39         unsigned char           mr_qrv;
  40         unsigned char           mr_gq_running;
  41         unsigned char           mr_ifc_count;
  42         struct timer_list       mr_gq_timer;    /* general query timer */
  43         struct timer_list       mr_ifc_timer;   /* interface change timer */
  44
  45         struct neigh_parms      *arp_parms;
  46         struct ipv4_devconf     cnf;
  47         struct rcu_head         rcu_head;
  48 };
  49
  50 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
  51 #define IPV4_DEVCONF_ALL(net, attr) \
  52         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  53
  54 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  55 {
  56         index--;
  57         return in_dev->cnf.data[index];
  58 }
  59
  60 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  61                                     int val)
  62 {
  63         index--;
  64         set_bit(index, in_dev->cnf.state);
  65         in_dev->cnf.data[index] = val;
  66 }
  67
  68 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  69 {
  70         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
  71 }
  72
  73 #define IN_DEV_CONF_GET(in_dev, attr) \
  74         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
  75 #define IN_DEV_CONF_SET(in_dev, attr, val) \
  76         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
  77
  78 #define IN_DEV_ANDCONF(in_dev, attr) \
  79         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
  80          IN_DEV_CONF_GET((in_dev), attr))
  81
  82 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
  83         (IPV4_DEVCONF_ALL(net, attr) || \
  84          IN_DEV_CONF_GET((in_dev), attr))
  85
  86 #define IN_DEV_ORCONF(in_dev, attr) \
  87         IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
  88
  89 #define IN_DEV_MAXCONF(in_dev, attr) \
  90         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
  91              IN_DEV_CONF_GET((in_dev), attr)))
  92
  93 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
  94 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
  95 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
  96 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
  97 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
  98                                                        ACCEPT_SOURCE_ROUTE)
  99 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
 100 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
 101
 102 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
 103 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
 104 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
 105 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
 106 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
 107 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
 108                                                       SECURE_REDIRECTS)
 109 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
 110 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
 111 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
 112                                         IN_DEV_ORCONF((in_dev), \
 113                                                       PROMOTE_SECONDARIES)
 114 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
 115 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
 116         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
 117
 118 #define IN_DEV_RX_REDIRECTS(in_dev) \
 119         ((IN_DEV_FORWARD(in_dev) && \
 120           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 121          || (!IN_DEV_FORWARD(in_dev) && \
 122           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 123
 124 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
 125         IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
 126
 127 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 128 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
 129 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 130 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 131 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 132
 133 struct in_ifaddr {
 134         struct hlist_node       hash;
 135         struct in_ifaddr        *ifa_next;
 136         struct in_device        *ifa_dev;
 137         struct rcu_head         rcu_head;
 138         __be32                  ifa_local;
 139         __be32                  ifa_address;
 140         __be32                  ifa_mask;
 141         __be32                  ifa_broadcast;
 142         unsigned char           ifa_scope;
 143         unsigned char           ifa_prefixlen;
 144         __u32                   ifa_flags;
 145         char                    ifa_label[IFNAMSIZ];
 146
 147         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
 148         __u32                   ifa_valid_lft;
 149         __u32                   ifa_preferred_lft;
 150         unsigned long           ifa_cstamp; /* created timestamp */
 151         unsigned long           ifa_tstamp; /* updated timestamp */
 152 };
 153
 154 struct in_validator_info {
 155         __be32                  ivi_addr;
 156         struct in_device        *ivi_dev;
 157 };
 158
 159 int register_inetaddr_notifier(struct notifier_block *nb);
 160 int unregister_inetaddr_notifier(struct notifier_block *nb);
 161 int register_inetaddr_validator_notifier(struct notifier_block *nb);
 162 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
 163
 164 void inet_netconf_notify_devconf(struct net *net, int event, int type,
 165                                  int ifindex, struct ipv4_devconf *devconf);
 166
 167 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 168 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 169 {
 170         return __ip_dev_find(net, addr, true);
 171 }
 172
 173 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 174 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 175 void devinet_init(void);
 176 struct in_device *inetdev_by_index(struct net *, int);
 177 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 178 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
 179                          __be32 local, int scope);
 180 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
 181                                     __be32 mask);
 182 static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 183 {
 184         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 185 }
 186
 187 /*
 188  *      Check if a mask is acceptable.
 189  */
 190
 191 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
 192 {
 193         __u32 hmask;
 194         if (addr & (mask = ~mask))
 195                 return true;
 196         hmask = ntohl(mask);
 197         if (hmask & (hmask+1))
 198                 return true;
 199         return false;
 200 }
 201
 202 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 203   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 204
 205 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 206   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 207
 208
 209 #define endfor_ifa(in_dev) }
 210
 211 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 212 {
 213         return rcu_dereference(dev->ip_ptr);
 214 }
 215
 216 static inline struct in_device *in_dev_get(const struct net_device *dev)
 217 {
 218         struct in_device *in_dev;
 219
 220         rcu_read_lock();
 221         in_dev = __in_dev_get_rcu(dev);
 222         if (in_dev)
 223                 refcount_inc(&in_dev->refcnt);
 224         rcu_read_unlock();
 225         return in_dev;
 226 }
 227
 228 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 229 {
 230         return rtnl_dereference(dev->ip_ptr);
 231 }
 232
 233 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
 234 {
 235         struct in_device *in_dev = __in_dev_get_rcu(dev);
 236
 237         return in_dev ? in_dev->arp_parms : NULL;
 238 }
 239
 240 void in_dev_finish_destroy(struct in_device *idev);
 241
 242 static inline void in_dev_put(struct in_device *idev)
 243 {
 244         if (refcount_dec_and_test(&idev->refcnt))
 245                 in_dev_finish_destroy(idev);
 246 }
 247
 248 #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
 249 #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
 250
 251 #endif /* __KERNEL__ */
 252
 253 static __inline__ __be32 inet_make_mask(int logmask)
 254 {
 255         if (logmask)
 256                 return htonl(~((1U<<(32-logmask))-1));
 257         return 0;
 258 }
 259
 260 static __inline__ int inet_mask_len(__be32 mask)
 261 {
 262         __u32 hmask = ntohl(mask);
 263         if (!hmask)
 264                 return 0;
 265         return 32 - ffz(~hmask);
 266 }
 267
 268
 269 #endif /* _LINUX_INETDEVICE_H */