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Linux/include/linux/inetdevice.h

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

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