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     arp_accept;
  29         int     medium_id;
  30         int     no_xfrm;
  31         int     no_policy;
  32         int     force_igmp_version;
  33         int     promote_secondaries;
  34         void    *sysctl;
  35 };
  36
  37 extern struct ipv4_devconf ipv4_devconf;
  38
  39 struct in_device
  40 {
  41         struct net_device       *dev;
  42         atomic_t                refcnt;
  43         int                     dead;
  44         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
  45         rwlock_t                mc_list_lock;
  46         struct ip_mc_list       *mc_list;       /* IP multicast filter chain    */
  47         spinlock_t              mc_tomb_lock;
  48         struct ip_mc_list       *mc_tomb;
  49         unsigned long           mr_v1_seen;
  50         unsigned long           mr_v2_seen;
  51         unsigned long           mr_maxdelay;
  52         unsigned char           mr_qrv;
  53         unsigned char           mr_gq_running;
  54         unsigned char           mr_ifc_count;
  55         struct timer_list       mr_gq_timer;    /* general query timer */
  56         struct timer_list       mr_ifc_timer;   /* interface change timer */
  57
  58         struct neigh_parms      *arp_parms;
  59         struct ipv4_devconf     cnf;
  60         struct rcu_head         rcu_head;
  61 };
  62
  63 #define IN_DEV_FORWARD(in_dev)          ((in_dev)->cnf.forwarding)
  64 #define IN_DEV_MFORWARD(in_dev)         (ipv4_devconf.mc_forwarding && (in_dev)->cnf.mc_forwarding)
  65 #define IN_DEV_RPFILTER(in_dev)         (ipv4_devconf.rp_filter && (in_dev)->cnf.rp_filter)
  66 #define IN_DEV_SOURCE_ROUTE(in_dev)     (ipv4_devconf.accept_source_route && (in_dev)->cnf.accept_source_route)
  67 #define IN_DEV_BOOTP_RELAY(in_dev)      (ipv4_devconf.bootp_relay && (in_dev)->cnf.bootp_relay)
  68
  69 #define IN_DEV_LOG_MARTIANS(in_dev)     (ipv4_devconf.log_martians || (in_dev)->cnf.log_martians)
  70 #define IN_DEV_PROXY_ARP(in_dev)        (ipv4_devconf.proxy_arp || (in_dev)->cnf.proxy_arp)
  71 #define IN_DEV_SHARED_MEDIA(in_dev)     (ipv4_devconf.shared_media || (in_dev)->cnf.shared_media)
  72 #define IN_DEV_TX_REDIRECTS(in_dev)     (ipv4_devconf.send_redirects || (in_dev)->cnf.send_redirects)
  73 #define IN_DEV_SEC_REDIRECTS(in_dev)    (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
  74 #define IN_DEV_IDTAG(in_dev)            ((in_dev)->cnf.tag)
  75 #define IN_DEV_MEDIUM_ID(in_dev)        ((in_dev)->cnf.medium_id)
  76 #define IN_DEV_PROMOTE_SECONDARIES(in_dev)      (ipv4_devconf.promote_secondaries || (in_dev)->cnf.promote_secondaries)
  77
  78 #define IN_DEV_RX_REDIRECTS(in_dev) \
  79         ((IN_DEV_FORWARD(in_dev) && \
  80           (ipv4_devconf.accept_redirects && (in_dev)->cnf.accept_redirects)) \
  81          || (!IN_DEV_FORWARD(in_dev) && \
  82           (ipv4_devconf.accept_redirects || (in_dev)->cnf.accept_redirects)))
  83
  84 #define IN_DEV_ARPFILTER(in_dev)        (ipv4_devconf.arp_filter || (in_dev)->cnf.arp_filter)
  85 #define IN_DEV_ARP_ANNOUNCE(in_dev)     (max(ipv4_devconf.arp_announce, (in_dev)->cnf.arp_announce))
  86 #define IN_DEV_ARP_IGNORE(in_dev)       (max(ipv4_devconf.arp_ignore, (in_dev)->cnf.arp_ignore))
  87
  88 struct in_ifaddr
  89 {
  90         struct in_ifaddr        *ifa_next;
  91         struct in_device        *ifa_dev;
  92         struct rcu_head         rcu_head;
  93         __be32                  ifa_local;
  94         __be32                  ifa_address;
  95         __be32                  ifa_mask;
  96         __be32                  ifa_broadcast;
  97         __be32                  ifa_anycast;
  98         unsigned char           ifa_scope;
  99         unsigned char           ifa_flags;
 100         unsigned char           ifa_prefixlen;
 101         char                    ifa_label[IFNAMSIZ];
 102 };
 103
 104 extern int register_inetaddr_notifier(struct notifier_block *nb);
 105 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 106
 107 extern struct net_device        *ip_dev_find(__be32 addr);
 108 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 109 extern int              devinet_ioctl(unsigned int cmd, void __user *);
 110 extern void             devinet_init(void);
 111 extern struct in_device *inetdev_init(struct net_device *dev);
 112 extern struct in_device *inetdev_by_index(int);
 113 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
 114 extern __be32           inet_confirm_addr(const struct net_device *dev, __be32 dst, __be32 local, int scope);
 115 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
 116 extern void             inet_forward_change(void);
 117
 118 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
 119 {
 120         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 121 }
 122
 123 /*
 124  *      Check if a mask is acceptable.
 125  */
 126
 127 static __inline__ int bad_mask(__be32 mask, __be32 addr)
 128 {
 129         __u32 hmask;
 130         if (addr & (mask = ~mask))
 131                 return 1;
 132         hmask = ntohl(mask);
 133         if (hmask & (hmask+1))
 134                 return 1;
 135         return 0;
 136 }
 137
 138 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
 139   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
 140
 141 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
 142   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
 143
 144
 145 #define endfor_ifa(in_dev) }
 146
 147 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 148 {
 149         struct in_device *in_dev = dev->ip_ptr;
 150         if (in_dev)
 151                 in_dev = rcu_dereference(in_dev);
 152         return in_dev;
 153 }
 154
 155 static __inline__ struct in_device *
 156 in_dev_get(const struct net_device *dev)
 157 {
 158         struct in_device *in_dev;
 159
 160         rcu_read_lock();
 161         in_dev = __in_dev_get_rcu(dev);
 162         if (in_dev)
 163                 atomic_inc(&in_dev->refcnt);
 164         rcu_read_unlock();
 165         return in_dev;
 166 }
 167
 168 static __inline__ struct in_device *
 169 __in_dev_get_rtnl(const struct net_device *dev)
 170 {
 171         return (struct in_device*)dev->ip_ptr;
 172 }
 173
 174 extern void in_dev_finish_destroy(struct in_device *idev);
 175
 176 static inline void in_dev_put(struct in_device *idev)
 177 {
 178         if (atomic_dec_and_test(&idev->refcnt))
 179                 in_dev_finish_destroy(idev);
 180 }
 181
 182 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
 183 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
 184
 185 #endif /* __KERNEL__ */
 186
 187 static __inline__ __be32 inet_make_mask(int logmask)
 188 {
 189         if (logmask)
 190                 return htonl(~((1<<(32-logmask))-1));
 191         return 0;
 192 }
 193
 194 static __inline__ int inet_mask_len(__be32 mask)
 195 {
 196         __u32 hmask = ntohl(mask);
 197         if (!hmask)
 198                 return 0;
 199         return 32 - ffz(~hmask);
 200 }
 201
 202
 203 #endif /* _LINUX_INETDEVICE_H */