linux/include/linux/inetdevice.h
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   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
  14enum
  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
  47struct ipv4_devconf {
  48        void    *sysctl;
  49        int     data[IPV4_DEVCONF_MAX];
  50        DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
  51};
  52
  53struct 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
  80static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
  81{
  82        index--;
  83        return in_dev->cnf.data[index];
  84}
  85
  86static 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
  94static 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
 156struct 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
 171extern int register_inetaddr_notifier(struct notifier_block *nb);
 172extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 173
 174extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
 175                                        struct ipv4_devconf *devconf);
 176
 177extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
 178static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
 179{
 180        return __ip_dev_find(net, addr, true);
 181}
 182
 183extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 184extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 185extern void             devinet_init(void);
 186extern struct in_device *inetdev_by_index(struct net *, int);
 187extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 188extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
 189extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 190
 191static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 192{
 193        return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 194}
 195
 196/*
 197 *      Check if a mask is acceptable.
 198 */
 199 
 200static __inline__ int bad_mask(__be32 mask, __be32 addr)
 201{
 202        __u32 hmask;
 203        if (addr & (mask = ~mask))
 204                return 1;
 205        hmask = ntohl(mask);
 206        if (hmask & (hmask+1))
 207                return 1;
 208        return 0;
 209}
 210
 211#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 212  for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 213
 214#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 215  for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 216
 217
 218#define endfor_ifa(in_dev) }
 219
 220static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 221{
 222        return rcu_dereference(dev->ip_ptr);
 223}
 224
 225static inline struct in_device *in_dev_get(const struct net_device *dev)
 226{
 227        struct in_device *in_dev;
 228
 229        rcu_read_lock();
 230        in_dev = __in_dev_get_rcu(dev);
 231        if (in_dev)
 232                atomic_inc(&in_dev->refcnt);
 233        rcu_read_unlock();
 234        return in_dev;
 235}
 236
 237static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
 238{
 239        return rtnl_dereference(dev->ip_ptr);
 240}
 241
 242extern void in_dev_finish_destroy(struct in_device *idev);
 243
 244static inline void in_dev_put(struct in_device *idev)
 245{
 246        if (atomic_dec_and_test(&idev->refcnt))
 247                in_dev_finish_destroy(idev);
 248}
 249
 250#define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 251#define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 252
 253#endif /* __KERNEL__ */
 254
 255static __inline__ __be32 inet_make_mask(int logmask)
 256{
 257        if (logmask)
 258                return htonl(~((1<<(32-logmask))-1));
 259        return 0;
 260}
 261
 262static __inline__ int inet_mask_len(__be32 mask)
 263{
 264        __u32 hmask = ntohl(mask);
 265        if (!hmask)
 266                return 0;
 267        return 32 - ffz(~hmask);
 268}
 269
 270
 271#endif /* _LINUX_INETDEVICE_H */
 272
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