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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/ip.h>
  9 #include <linux/netdevice.h>
 10 #include <linux/rcupdate.h>
 11 #include <linux/timer.h>
 12 #include <linux/sysctl.h>
 13 #include <linux/rtnetlink.h>
 14 #include <linux/refcount.h>
 15 
 16 struct ipv4_devconf {
 17         void    *sysctl;
 18         int     data[IPV4_DEVCONF_MAX];
 19         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
 20 };
 21 
 22 #define MC_HASH_SZ_LOG 9
 23 
 24 struct in_device {
 25         struct net_device       *dev;
 26         refcount_t              refcnt;
 27         int                     dead;
 28         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
 29 
 30         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
 31         struct ip_mc_list __rcu * __rcu *mc_hash;
 32 
 33         int                     mc_count;       /* Number of installed mcasts   */
 34         spinlock_t              mc_tomb_lock;
 35         struct ip_mc_list       *mc_tomb;
 36         unsigned long           mr_v1_seen;
 37         unsigned long           mr_v2_seen;
 38         unsigned long           mr_maxdelay;
 39         unsigned char           mr_qrv;
 40         unsigned char           mr_gq_running;
 41         unsigned char           mr_ifc_count;
 42         struct timer_list       mr_gq_timer;    /* general query timer */
 43         struct timer_list       mr_ifc_timer;   /* interface change timer */
 44 
 45         struct neigh_parms      *arp_parms;
 46         struct ipv4_devconf     cnf;
 47         struct rcu_head         rcu_head;
 48 };
 49 
 50 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
 51 #define IPV4_DEVCONF_ALL(net, attr) \
 52         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
 53 
 54 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
 55 {
 56         index--;
 57         return in_dev->cnf.data[index];
 58 }
 59 
 60 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
 61                                     int val)
 62 {
 63         index--;
 64         set_bit(index, in_dev->cnf.state);
 65         in_dev->cnf.data[index] = val;
 66 }
 67 
 68 static inline void ipv4_devconf_setall(struct in_device *in_dev)
 69 {
 70         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
 71 }
 72 
 73 #define IN_DEV_CONF_GET(in_dev, attr) \
 74         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
 75 #define IN_DEV_CONF_SET(in_dev, attr, val) \
 76         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
 77 
 78 #define IN_DEV_ANDCONF(in_dev, attr) \
 79         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
 80          IN_DEV_CONF_GET((in_dev), attr))
 81 
 82 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
 83         (IPV4_DEVCONF_ALL(net, attr) || \
 84          IN_DEV_CONF_GET((in_dev), attr))
 85 
 86 #define IN_DEV_ORCONF(in_dev, attr) \
 87         IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
 88 
 89 #define IN_DEV_MAXCONF(in_dev, attr) \
 90         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
 91              IN_DEV_CONF_GET((in_dev), attr)))
 92 
 93 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
 94 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
 95 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
 96 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
 97 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
 98                                                        ACCEPT_SOURCE_ROUTE)
 99 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
100 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
101 
102 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
103 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
104 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
105 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
106 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
107 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
108                                                       SECURE_REDIRECTS)
109 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
110 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
111 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
112                                         IN_DEV_ORCONF((in_dev), \
113                                                       PROMOTE_SECONDARIES)
114 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
115 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
116         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
117 
118 #define IN_DEV_RX_REDIRECTS(in_dev) \
119         ((IN_DEV_FORWARD(in_dev) && \
120           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
121          || (!IN_DEV_FORWARD(in_dev) && \
122           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
123 
124 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
125         IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
126 
127 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
128 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
129 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
130 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
131 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
132 
133 struct in_ifaddr {
134         struct hlist_node       hash;
135         struct in_ifaddr        *ifa_next;
136         struct in_device        *ifa_dev;
137         struct rcu_head         rcu_head;
138         __be32                  ifa_local;
139         __be32                  ifa_address;
140         __be32                  ifa_mask;
141         __be32                  ifa_broadcast;
142         unsigned char           ifa_scope;
143         unsigned char           ifa_prefixlen;
144         __u32                   ifa_flags;
145         char                    ifa_label[IFNAMSIZ];
146 
147         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
148         __u32                   ifa_valid_lft;
149         __u32                   ifa_preferred_lft;
150         unsigned long           ifa_cstamp; /* created timestamp */
151         unsigned long           ifa_tstamp; /* updated timestamp */
152 };
153 
154 struct in_validator_info {
155         __be32                  ivi_addr;
156         struct in_device        *ivi_dev;
157 };
158 
159 int register_inetaddr_notifier(struct notifier_block *nb);
160 int unregister_inetaddr_notifier(struct notifier_block *nb);
161 int register_inetaddr_validator_notifier(struct notifier_block *nb);
162 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
163 
164 void inet_netconf_notify_devconf(struct net *net, int event, int type,
165                                  int ifindex, struct ipv4_devconf *devconf);
166 
167 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
168 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
169 {
170         return __ip_dev_find(net, addr, true);
171 }
172 
173 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
174 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
175 void devinet_init(void);
176 struct in_device *inetdev_by_index(struct net *, int);
177 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
178 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
179                          __be32 local, int scope);
180 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
181                                     __be32 mask);
182 static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
183 {
184         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
185 }
186 
187 /*
188  *      Check if a mask is acceptable.
189  */
190  
191 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
192 {
193         __u32 hmask;
194         if (addr & (mask = ~mask))
195                 return true;
196         hmask = ntohl(mask);
197         if (hmask & (hmask+1))
198                 return true;
199         return false;
200 }
201 
202 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
203   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
204 
205 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
206   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
207 
208 
209 #define endfor_ifa(in_dev) }
210 
211 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
212 {
213         return rcu_dereference(dev->ip_ptr);
214 }
215 
216 static inline struct in_device *in_dev_get(const struct net_device *dev)
217 {
218         struct in_device *in_dev;
219 
220         rcu_read_lock();
221         in_dev = __in_dev_get_rcu(dev);
222         if (in_dev)
223                 refcount_inc(&in_dev->refcnt);
224         rcu_read_unlock();
225         return in_dev;
226 }
227 
228 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
229 {
230         return rtnl_dereference(dev->ip_ptr);
231 }
232 
233 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
234 {
235         struct in_device *in_dev = __in_dev_get_rcu(dev);
236 
237         return in_dev ? in_dev->arp_parms : NULL;
238 }
239 
240 void in_dev_finish_destroy(struct in_device *idev);
241 
242 static inline void in_dev_put(struct in_device *idev)
243 {
244         if (refcount_dec_and_test(&idev->refcnt))
245                 in_dev_finish_destroy(idev);
246 }
247 
248 #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
249 #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
250 
251 #endif /* __KERNEL__ */
252 
253 static __inline__ __be32 inet_make_mask(int logmask)
254 {
255         if (logmask)
256                 return htonl(~((1U<<(32-logmask))-1));
257         return 0;
258 }
259 
260 static __inline__ int inet_mask_len(__be32 mask)
261 {
262         __u32 hmask = ntohl(mask);
263         if (!hmask)
264                 return 0;
265         return 32 - ffz(~hmask);
266 }
267 
268 
269 #endif /* _LINUX_INETDEVICE_H */
270 

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