include/linux/inetdevice.h

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