include/linux/inetdevice.h

   1 #ifndef _LINUX_INETDEVICE_H
   2 #define _LINUX_INETDEVICE_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/if.h>
   7 #include <linux/netdevice.h>
   8 #include <linux/rcupdate.h>
   9 #include <linux/timer.h>
  10
  11 struct ipv4_devconf
  12 {
  13         int     accept_redirects;
  14         int     send_redirects;
  15         int     secure_redirects;
  16         int     shared_media;
  17         int     accept_source_route;
  18         int     rp_filter;
  19         int     proxy_arp;
  20         int     bootp_relay;
  21         int     log_martians;
  22         int     forwarding;
  23         int     mc_forwarding;
  24         int     tag;
  25         int     arp_filter;
  26         int     arp_announce;
  27         int     arp_ignore;
  28         int     medium_id;
  29         int     no_xfrm;
  30         int     no_policy;
  31         int     force_igmp_version;
  32         void    *sysctl;
  33 };
  34
  35 extern struct ipv4_devconf ipv4_devconf;
  36
  37 struct in_device
  38 {
  39         struct net_device       *dev;
  40         atomic_t                refcnt;
  41         int                     dead;
  42         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  43         rwlock_t                mc_list_lock;
  44         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  45         spinlock_t              mc_tomb_lock;
  46         struct ip_mc_list       *mc_tomb;
  47         unsigned long           mr_v1_seen;
  48         unsigned long           mr_v2_seen;
  49         unsigned long           mr_maxdelay;
  50         unsigned char           mr_qrv;
  51         unsigned char           mr_gq_running;
  52         unsigned char           mr_ifc_count;
  53         struct timer_list       mr_gq_timer;    /* general query timer */
  54         struct timer_list       mr_ifc_timer;   /* interface change timer */
  55
  56         struct neigh_parms      *arp_parms;
  57         struct ipv4_devconf     cnf;
  58         struct rcu_head         rcu_head;
  59 };
  60
  61 #define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
  62 #define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
  63 #define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
  64 #define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
  65 #define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
  66
  67 #define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
  68 #define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
  69 #define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
  70 #define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
  71 #define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
  72 #define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
  73 #define IN_DEV_MEDIUM_ID(in_dev)        ((in_dev)->cnf.medium_id)
  74
  75 #define IN_DEV_RX_REDIRECTS(in_dev) \
  76         ((IN_DEV_FORWARD(in_dev) && \
  77           (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
  78          || (!IN_DEV_FORWARD(in_dev) && \
  79           (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
  80
  81 #define IN_DEV_ARPFILTER(in_dev)        (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
  82 #define IN_DEV_ARP_ANNOUNCE(in_dev)     (max(ipv4_devconf.arp_announce, (in_dev)->cnf.arp_announce))
  83 #define IN_DEV_ARP_IGNORE(in_dev)       (max(ipv4_devconf.arp_ignore, (in_dev)->cnf.arp_ignore))
  84
  85 struct in_ifaddr
  86 {
  87         struct in_ifaddr        *ifa_next;
  88         struct in_device        *ifa_dev;
  89         struct rcu_head         rcu_head;
  90         u32                     ifa_local;
  91         u32                     ifa_address;
  92         u32                     ifa_mask;
  93         u32                     ifa_broadcast;
  94         u32                     ifa_anycast;
  95         unsigned char           ifa_scope;
  96         unsigned char           ifa_flags;
  97         unsigned char           ifa_prefixlen;
  98         char                    ifa_label[IFNAMSIZ];
  99 };
 100
 101 extern int register_inetaddr_notifier(struct notifier_block *nb);
 102 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 103
 104 extern struct net_device        *ip_dev_find(u32 addr);
 105 extern int              inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
 106 extern int              devinet_ioctl(unsigned int cmd, void __user *);
 107 extern void             devinet_init(void);
 108 extern struct in_device *inetdev_init(struct net_device *dev);
 109 extern struct in_device *inetdev_by_index(int);
 110 extern u32              inet_select_addr(const struct net_device *dev, u32 dst, int scope);
 111 extern u32              inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope);
 112 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
 113 extern void             inet_forward_change(void);
 114
 115 static __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
 116 {
 117         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 118 }
 119
 120 /*
 121  *      Check if a mask is acceptable.
 122  */
 123
 124 static __inline__ int bad_mask(u32 mask, u32 addr)
 125 {
 126         if (addr & (mask = ~mask))
 127                 return 1;
 128         mask = ntohl(mask);
 129         if (mask & (mask+1))
 130                 return 1;
 131         return 0;
 132 }
 133
 134 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 135   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 136
 137 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 138   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 139
 140
 141 #define endfor_ifa(in_dev) }
 142
 143 static __inline__ struct in_device *
 144 in_dev_get(const struct net_device *dev)
 145 {
 146         struct in_device *in_dev;
 147
 148         rcu_read_lock();
 149         in_dev = dev->ip_ptr;
 150         if (in_dev)
 151                 atomic_inc(&in_dev->refcnt);
 152         rcu_read_unlock();
 153         return in_dev;
 154 }
 155
 156 static __inline__ struct in_device *
 157 __in_dev_get(const struct net_device *dev)
 158 {
 159         return (struct in_device*)dev->ip_ptr;
 160 }
 161
 162 extern void in_dev_finish_destroy(struct in_device *idev);
 163
 164 static inline void in_dev_put(struct in_device *idev)
 165 {
 166         if (atomic_dec_and_test(&idev->refcnt))
 167                 in_dev_finish_destroy(idev);
 168 }
 169
 170 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 171 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 172
 173 #endif /* __KERNEL__ */
 174
 175 static __inline__ __u32 inet_make_mask(int logmask)
 176 {
 177         if (logmask)
 178                 return htonl(~((1<<(32-logmask))-1));
 179         return 0;
 180 }
 181
 182 static __inline__ int inet_mask_len(__u32 mask)
 183 {
 184         if (!(mask = ntohl(mask)))
 185                 return 0;
 186         return 32 - ffz(~mask);
 187 }
 188
 189
 190 #endif /* _LINUX_INETDEVICE_H */