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TOMOYO Linux Cross Reference
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 
 14 enum
 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_MAX
 42 };
 43 
 44 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
 45 
 46 struct ipv4_devconf {
 47         void    *sysctl;
 48         int     data[IPV4_DEVCONF_MAX];
 49         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
 50 };
 51 
 52 struct in_device {
 53         struct net_device       *dev;
 54         atomic_t                refcnt;
 55         int                     dead;
 56         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
 57         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
 58         int                     mc_count;       /* Number of installed mcasts   */
 59         spinlock_t              mc_tomb_lock;
 60         struct ip_mc_list       *mc_tomb;
 61         unsigned long           mr_v1_seen;
 62         unsigned long           mr_v2_seen;
 63         unsigned long           mr_maxdelay;
 64         unsigned char           mr_qrv;
 65         unsigned char           mr_gq_running;
 66         unsigned char           mr_ifc_count;
 67         struct timer_list       mr_gq_timer;    /* general query timer */
 68         struct timer_list       mr_ifc_timer;   /* interface change timer */
 69 
 70         struct neigh_parms      *arp_parms;
 71         struct ipv4_devconf     cnf;
 72         struct rcu_head         rcu_head;
 73 };
 74 
 75 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
 76 #define IPV4_DEVCONF_ALL(net, attr) \
 77         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
 78 
 79 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
 80 {
 81         index--;
 82         return in_dev->cnf.data[index];
 83 }
 84 
 85 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
 86                                     int val)
 87 {
 88         index--;
 89         set_bit(index, in_dev->cnf.state);
 90         in_dev->cnf.data[index] = val;
 91 }
 92 
 93 static inline void ipv4_devconf_setall(struct in_device *in_dev)
 94 {
 95         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
 96 }
 97 
 98 #define IN_DEV_CONF_GET(in_dev, attr) \
 99         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
100 #define IN_DEV_CONF_SET(in_dev, attr, val) \
101         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
102 
103 #define IN_DEV_ANDCONF(in_dev, attr) \
104         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
105          IN_DEV_CONF_GET((in_dev), attr))
106 #define IN_DEV_ORCONF(in_dev, attr) \
107         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) || \
108          IN_DEV_CONF_GET((in_dev), attr))
109 #define IN_DEV_MAXCONF(in_dev, attr) \
110         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
111              IN_DEV_CONF_GET((in_dev), attr)))
112 
113 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
114 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
115 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
116 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
117 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
118                                                        ACCEPT_SOURCE_ROUTE)
119 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
120 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
121 
122 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
123 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
124 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
125 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
126 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
127 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
128                                                       SECURE_REDIRECTS)
129 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
130 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
131 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
132                                         IN_DEV_ORCONF((in_dev), \
133                                                       PROMOTE_SECONDARIES)
134 
135 #define IN_DEV_RX_REDIRECTS(in_dev) \
136         ((IN_DEV_FORWARD(in_dev) && \
137           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
138          || (!IN_DEV_FORWARD(in_dev) && \
139           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
140 
141 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
142 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
143 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
144 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
145 
146 struct in_ifaddr {
147         struct hlist_node       hash;
148         struct in_ifaddr        *ifa_next;
149         struct in_device        *ifa_dev;
150         struct rcu_head         rcu_head;
151         __be32                  ifa_local;
152         __be32                  ifa_address;
153         __be32                  ifa_mask;
154         __be32                  ifa_broadcast;
155         unsigned char           ifa_scope;
156         unsigned char           ifa_flags;
157         unsigned char           ifa_prefixlen;
158         char                    ifa_label[IFNAMSIZ];
159 };
160 
161 extern int register_inetaddr_notifier(struct notifier_block *nb);
162 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
163 
164 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
165 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
166 {
167         return __ip_dev_find(net, addr, true);
168 }
169 
170 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
171 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
172 extern void             devinet_init(void);
173 extern struct in_device *inetdev_by_index(struct net *, int);
174 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
175 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
176 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
177 
178 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
179 {
180         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
181 }
182 
183 /*
184  *      Check if a mask is acceptable.
185  */
186  
187 static __inline__ int bad_mask(__be32 mask, __be32 addr)
188 {
189         __u32 hmask;
190         if (addr & (mask = ~mask))
191                 return 1;
192         hmask = ntohl(mask);
193         if (hmask & (hmask+1))
194                 return 1;
195         return 0;
196 }
197 
198 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
199   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
200 
201 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
202   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
203 
204 
205 #define endfor_ifa(in_dev) }
206 
207 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
208 {
209         return rcu_dereference(dev->ip_ptr);
210 }
211 
212 static inline struct in_device *in_dev_get(const struct net_device *dev)
213 {
214         struct in_device *in_dev;
215 
216         rcu_read_lock();
217         in_dev = __in_dev_get_rcu(dev);
218         if (in_dev)
219                 atomic_inc(&in_dev->refcnt);
220         rcu_read_unlock();
221         return in_dev;
222 }
223 
224 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
225 {
226         return rtnl_dereference(dev->ip_ptr);
227 }
228 
229 extern void in_dev_finish_destroy(struct in_device *idev);
230 
231 static inline void in_dev_put(struct in_device *idev)
232 {
233         if (atomic_dec_and_test(&idev->refcnt))
234                 in_dev_finish_destroy(idev);
235 }
236 
237 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
238 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
239 
240 #endif /* __KERNEL__ */
241 
242 static __inline__ __be32 inet_make_mask(int logmask)
243 {
244         if (logmask)
245                 return htonl(~((1<<(32-logmask))-1));
246         return 0;
247 }
248 
249 static __inline__ int inet_mask_len(__be32 mask)
250 {
251         __u32 hmask = ntohl(mask);
252         if (!hmask)
253                 return 0;
254         return 32 - ffz(~hmask);
255 }
256 
257 
258 #endif /* _LINUX_INETDEVICE_H */
259 

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