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_ROUTE_LOCALNET,
  42         __IPV4_DEVCONF_MAX
  43 };
  44
  45 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
  46
  47 struct ipv4_devconf {
  48         void    *sysctl;
  49         int     data[IPV4_DEVCONF_MAX];
  50         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
  51 };
  52
  53 struct in_device {
  54         struct net_device       *dev;
  55         atomic_t                refcnt;
  56         int                     dead;
  57         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  58         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
  59         int                     mc_count;       /* Number of installed mcasts   */
  60         spinlock_t              mc_tomb_lock;
  61         struct ip_mc_list       *mc_tomb;
  62         unsigned long           mr_v1_seen;
  63         unsigned long           mr_v2_seen;
  64         unsigned long           mr_maxdelay;
  65         unsigned char           mr_qrv;
  66         unsigned char           mr_gq_running;
  67         unsigned char           mr_ifc_count;
  68         struct timer_list       mr_gq_timer;    /* general query timer */
  69         struct timer_list       mr_ifc_timer;   /* interface change timer */
  70
  71         struct neigh_parms      *arp_parms;
  72         struct ipv4_devconf     cnf;
  73         struct rcu_head         rcu_head;
  74 };
  75
  76 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
  77 #define IPV4_DEVCONF_ALL(net, attr) \
  78         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
  79
  80 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  81 {
  82         index--;
  83         return in_dev->cnf.data[index];
  84 }
  85
  86 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
  87                                     int val)
  88 {
  89         index--;
  90         set_bit(index, in_dev->cnf.state);
  91         in_dev->cnf.data[index] = val;
  92 }
  93
  94 static inline void ipv4_devconf_setall(struct in_device *in_dev)
  95 {
  96         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
  97 }
  98
  99 #define IN_DEV_CONF_GET(in_dev, attr) \
 100         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
 101 #define IN_DEV_CONF_SET(in_dev, attr, val) \
 102         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
 103
 104 #define IN_DEV_ANDCONF(in_dev, attr) \
 105         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
 106          IN_DEV_CONF_GET((in_dev), attr))
 107
 108 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
 109         (IPV4_DEVCONF_ALL(net, attr) || \
 110          IN_DEV_CONF_GET((in_dev), attr))
 111
 112 #define IN_DEV_ORCONF(in_dev, attr) \
 113         IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
 114
 115 #define IN_DEV_MAXCONF(in_dev, attr) \
 116         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
 117              IN_DEV_CONF_GET((in_dev), attr)))
 118
 119 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
 120 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
 121 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
 122 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
 123 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
 124                                                        ACCEPT_SOURCE_ROUTE)
 125 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
 126 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
 127
 128 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
 129 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
 130 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
 131 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
 132 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
 133 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
 134                                                       SECURE_REDIRECTS)
 135 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
 136 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
 137 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
 138                                         IN_DEV_ORCONF((in_dev), \
 139                                                       PROMOTE_SECONDARIES)
 140 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
 141 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
 142         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
 143
 144 #define IN_DEV_RX_REDIRECTS(in_dev) \
 145         ((IN_DEV_FORWARD(in_dev) && \
 146           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
 147          || (!IN_DEV_FORWARD(in_dev) && \
 148           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
 149
 150 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
 151 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
 152 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
 153 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
 154 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
 155
 156 struct in_ifaddr {
 157         struct hlist_node       hash;
 158         struct in_ifaddr        *ifa_next;
 159         struct in_device        *ifa_dev;
 160         struct rcu_head         rcu_head;
 161         __be32                  ifa_local;
 162         __be32                  ifa_address;
 163         __be32                  ifa_mask;
 164         __be32                  ifa_broadcast;
 165         unsigned char           ifa_scope;
 166         unsigned char           ifa_flags;
 167         unsigned char           ifa_prefixlen;
 168         char                    ifa_label[IFNAMSIZ];
 169
 170         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
 171         __u32                   ifa_valid_lft;
 172         __u32                   ifa_preferred_lft;
 173         unsigned long           ifa_cstamp; /* created timestamp */
 174         unsigned long           ifa_tstamp; /* updated timestamp */
 175 };
 176
 177 extern int register_inetaddr_notifier(struct notifier_block *nb);
 178 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 179
 180 extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
 181                                         struct ipv4_devconf *devconf);
 182
 183 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 184 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 185 {
 186         return __ip_dev_find(net, addr, true);
 187 }
 188
 189 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 190 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 191 extern void             devinet_init(void);
 192 extern struct in_device *inetdev_by_index(struct net *, int);
 193 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 194 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 195 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 196
 197 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 198 {
 199         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 200 }
 201
 202 /*
 203  *      Check if a mask is acceptable.
 204  */
 205
 206 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 207 {
 208         __u32 hmask;
 209         if (addr & (mask = ~mask))
 210                 return 1;
 211         hmask = ntohl(mask);
 212         if (hmask & (hmask+1))
 213                 return 1;
 214         return 0;
 215 }
 216
 217 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 218   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 219
 220 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 221   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 222
 223
 224 #define endfor_ifa(in_dev) }
 225
 226 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 227 {
 228         return rcu_dereference(dev->ip_ptr);
 229 }
 230
 231 static inline struct in_device *in_dev_get(const struct net_device *dev)
 232 {
 233         struct in_device *in_dev;
 234
 235         rcu_read_lock();
 236         in_dev = __in_dev_get_rcu(dev);
 237         if (in_dev)
 238                 atomic_inc(&in_dev->refcnt);
 239         rcu_read_unlock();
 240         return in_dev;
 241 }
 242
 243 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 244 {
 245         return rtnl_dereference(dev->ip_ptr);
 246 }
 247
 248 extern void in_dev_finish_destroy(struct in_device *idev);
 249
 250 static inline void in_dev_put(struct in_device *idev)
 251 {
 252         if (atomic_dec_and_test(&idev->refcnt))
 253                 in_dev_finish_destroy(idev);
 254 }
 255
 256 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 257 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 258
 259 #endif /* __KERNEL__ */
 260
 261 static __inline__ __be32 inet_make_mask(int logmask)
 262 {
 263         if (logmask)
 264                 return htonl(~((1U<<(32-logmask))-1));
 265         return 0;
 266 }
 267
 268 static __inline__ int inet_mask_len(__be32 mask)
 269 {
 270         __u32 hmask = ntohl(mask);
 271         if (!hmask)
 272                 return 0;
 273         return 32 - ffz(~hmask);
 274 }
 275
 276
 277 #endif /* _LINUX_INETDEVICE_H */