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         int     promote_secondaries;
  33         void    *sysctl;
  34 };
  35
  36 extern struct ipv4_devconf ipv4_devconf;
  37
  38 struct in_device
  39 {
  40         struct net_device       *dev;
  41         atomic_t                refcnt;
  42         int                     dead;
  43         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  44         rwlock_t                mc_list_lock;
  45         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  46         spinlock_t              mc_tomb_lock;
  47         struct ip_mc_list       *mc_tomb;
  48         unsigned long           mr_v1_seen;
  49         unsigned long           mr_v2_seen;
  50         unsigned long           mr_maxdelay;
  51         unsigned char           mr_qrv;
  52         unsigned char           mr_gq_running;
  53         unsigned char           mr_ifc_count;
  54         struct timer_list       mr_gq_timer;    /* general query timer */
  55         struct timer_list       mr_ifc_timer;   /* interface change timer */
  56
  57         struct neigh_parms      *arp_parms;
  58         struct ipv4_devconf     cnf;
  59         struct rcu_head         rcu_head;
  60 };
  61
  62 #define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
  63 #define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
  64 #define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
  65 #define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
  66 #define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
  67
  68 #define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
  69 #define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
  70 #define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
  71 #define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
  72 #define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
  73 #define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
  74 #define IN_DEV_MEDIUM_ID(in_dev)        ((in_dev)->cnf.medium_id)
  75 #define IN_DEV_PROMOTE_SECONDARIES(in_dev)      (ipv4_devconf.promote_secondaries || (in_dev)->cnf.promote_secondaries)
  76
  77 #define IN_DEV_RX_REDIRECTS(in_dev) \
  78         ((IN_DEV_FORWARD(in_dev) && \
  79           (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
  80          || (!IN_DEV_FORWARD(in_dev) && \
  81           (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
  82
  83 #define IN_DEV_ARPFILTER(in_dev)        (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
  84 #define IN_DEV_ARP_ANNOUNCE(in_dev)     (max(ipv4_devconf.arp_announce, (in_dev)->cnf.arp_announce))
  85 #define IN_DEV_ARP_IGNORE(in_dev)       (max(ipv4_devconf.arp_ignore, (in_dev)->cnf.arp_ignore))
  86
  87 struct in_ifaddr
  88 {
  89         struct in_ifaddr        *ifa_next;
  90         struct in_device        *ifa_dev;
  91         struct rcu_head         rcu_head;
  92         u32                     ifa_local;
  93         u32                     ifa_address;
  94         u32                     ifa_mask;
  95         u32                     ifa_broadcast;
  96         u32                     ifa_anycast;
  97         unsigned char           ifa_scope;
  98         unsigned char           ifa_flags;
  99         unsigned char           ifa_prefixlen;
 100         char                    ifa_label[IFNAMSIZ];
 101 };
 102
 103 extern int register_inetaddr_notifier(struct notifier_block *nb);
 104 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 105
 106 extern struct net_device        *ip_dev_find(u32 addr);
 107 extern int              inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b);
 108 extern int              devinet_ioctl(unsigned int cmd, void __user *);
 109 extern void             devinet_init(void);
 110 extern struct in_device *inetdev_init(struct net_device *dev);
 111 extern struct in_device *inetdev_by_index(int);
 112 extern u32              inet_select_addr(const struct net_device *dev, u32 dst, int scope);
 113 extern u32              inet_confirm_addr(const struct net_device *dev, u32 dst, u32 local, int scope);
 114 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, u32 prefix, u32 mask);
 115 extern void             inet_forward_change(void);
 116
 117 static __inline__ int inet_ifa_match(u32 addr, struct in_ifaddr *ifa)
 118 {
 119         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 120 }
 121
 122 /*
 123  *      Check if a mask is acceptable.
 124  */
 125
 126 static __inline__ int bad_mask(u32 mask, u32 addr)
 127 {
 128         if (addr & (mask = ~mask))
 129                 return 1;
 130         mask = ntohl(mask);
 131         if (mask & (mask+1))
 132                 return 1;
 133         return 0;
 134 }
 135
 136 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 137   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 138
 139 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 140   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 141
 142
 143 #define endfor_ifa(in_dev) }
 144
 145 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 146 {
 147         struct in_device *in_dev = dev->ip_ptr;
 148         if (in_dev)
 149                 in_dev = rcu_dereference(in_dev);
 150         return in_dev;
 151 }
 152
 153 static __inline__ struct in_device *
 154 in_dev_get(const struct net_device *dev)
 155 {
 156         struct in_device *in_dev;
 157
 158         rcu_read_lock();
 159         in_dev = __in_dev_get_rcu(dev);
 160         if (in_dev)
 161                 atomic_inc(&in_dev->refcnt);
 162         rcu_read_unlock();
 163         return in_dev;
 164 }
 165
 166 static __inline__ struct in_device *
 167 __in_dev_get_rtnl(const struct net_device *dev)
 168 {
 169         return (struct in_device*)dev->ip_ptr;
 170 }
 171
 172 extern void in_dev_finish_destroy(struct in_device *idev);
 173
 174 static inline void in_dev_put(struct in_device *idev)
 175 {
 176         if (atomic_dec_and_test(&idev->refcnt))
 177                 in_dev_finish_destroy(idev);
 178 }
 179
 180 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 181 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 182
 183 #endif /* __KERNEL__ */
 184
 185 static __inline__ __u32 inet_make_mask(int logmask)
 186 {
 187         if (logmask)
 188                 return htonl(~((1<<(32-logmask))-1));
 189         return 0;
 190 }
 191
 192 static __inline__ int inet_mask_len(__u32 mask)
 193 {
 194         if (!(mask = ntohl(mask)))
 195                 return 0;
 196         return 32 - ffz(~mask);
 197 }
 198
 199
 200 #endif /* _LINUX_INETDEVICE_H */