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/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_ROUTE_LOCALNET,
 42         __IPV4_DEVCONF_MAX
 43 };
 44 
 45 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
 46 
 47 struct ipv4_devconf {
 48         void    *sysctl;
 49         int     data[IPV4_DEVCONF_MAX];
 50         DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
 51 };
 52 
 53 struct in_device {
 54         struct net_device       *dev;
 55         atomic_t                refcnt;
 56         int                     dead;
 57         struct in_ifaddr        *ifa_list;      /* IP ifaddr chain              */
 58         struct ip_mc_list __rcu *mc_list;       /* IP multicast filter chain    */
 59         int                     mc_count;       /* Number of installed mcasts   */
 60         spinlock_t              mc_tomb_lock;
 61         struct ip_mc_list       *mc_tomb;
 62         unsigned long           mr_v1_seen;
 63         unsigned long           mr_v2_seen;
 64         unsigned long           mr_maxdelay;
 65         unsigned char           mr_qrv;
 66         unsigned char           mr_gq_running;
 67         unsigned char           mr_ifc_count;
 68         struct timer_list       mr_gq_timer;    /* general query timer */
 69         struct timer_list       mr_ifc_timer;   /* interface change timer */
 70 
 71         struct neigh_parms      *arp_parms;
 72         struct ipv4_devconf     cnf;
 73         struct rcu_head         rcu_head;
 74 };
 75 
 76 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
 77 #define IPV4_DEVCONF_ALL(net, attr) \
 78         IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
 79 
 80 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
 81 {
 82         index--;
 83         return in_dev->cnf.data[index];
 84 }
 85 
 86 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
 87                                     int val)
 88 {
 89         index--;
 90         set_bit(index, in_dev->cnf.state);
 91         in_dev->cnf.data[index] = val;
 92 }
 93 
 94 static inline void ipv4_devconf_setall(struct in_device *in_dev)
 95 {
 96         bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
 97 }
 98 
 99 #define IN_DEV_CONF_GET(in_dev, attr) \
100         ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
101 #define IN_DEV_CONF_SET(in_dev, attr, val) \
102         ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
103 
104 #define IN_DEV_ANDCONF(in_dev, attr) \
105         (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
106          IN_DEV_CONF_GET((in_dev), attr))
107 
108 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
109         (IPV4_DEVCONF_ALL(net, attr) || \
110          IN_DEV_CONF_GET((in_dev), attr))
111 
112 #define IN_DEV_ORCONF(in_dev, attr) \
113         IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
114 
115 #define IN_DEV_MAXCONF(in_dev, attr) \
116         (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
117              IN_DEV_CONF_GET((in_dev), attr)))
118 
119 #define IN_DEV_FORWARD(in_dev)          IN_DEV_CONF_GET((in_dev), FORWARDING)
120 #define IN_DEV_MFORWARD(in_dev)         IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
121 #define IN_DEV_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
122 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
123 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
124                                                        ACCEPT_SOURCE_ROUTE)
125 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
126 #define IN_DEV_BOOTP_RELAY(in_dev)      IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
127 
128 #define IN_DEV_LOG_MARTIANS(in_dev)     IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
129 #define IN_DEV_PROXY_ARP(in_dev)        IN_DEV_ORCONF((in_dev), PROXY_ARP)
130 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
131 #define IN_DEV_SHARED_MEDIA(in_dev)     IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
132 #define IN_DEV_TX_REDIRECTS(in_dev)     IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
133 #define IN_DEV_SEC_REDIRECTS(in_dev)    IN_DEV_ORCONF((in_dev), \
134                                                       SECURE_REDIRECTS)
135 #define IN_DEV_IDTAG(in_dev)            IN_DEV_CONF_GET(in_dev, TAG)
136 #define IN_DEV_MEDIUM_ID(in_dev)        IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
137 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
138                                         IN_DEV_ORCONF((in_dev), \
139                                                       PROMOTE_SECONDARIES)
140 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
141 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
142         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
143 
144 #define IN_DEV_RX_REDIRECTS(in_dev) \
145         ((IN_DEV_FORWARD(in_dev) && \
146           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
147          || (!IN_DEV_FORWARD(in_dev) && \
148           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
149 
150 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
151 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
152 #define IN_DEV_ARP_ANNOUNCE(in_dev)     IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
153 #define IN_DEV_ARP_IGNORE(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
154 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
155 
156 struct in_ifaddr {
157         struct hlist_node       hash;
158         struct in_ifaddr        *ifa_next;
159         struct in_device        *ifa_dev;
160         struct rcu_head         rcu_head;
161         __be32                  ifa_local;
162         __be32                  ifa_address;
163         __be32                  ifa_mask;
164         __be32                  ifa_broadcast;
165         unsigned char           ifa_scope;
166         unsigned char           ifa_flags;
167         unsigned char           ifa_prefixlen;
168         char                    ifa_label[IFNAMSIZ];
169 
170         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
171         __u32                   ifa_valid_lft;
172         __u32                   ifa_preferred_lft;
173         unsigned long           ifa_cstamp; /* created timestamp */
174         unsigned long           ifa_tstamp; /* updated timestamp */
175 };
176 
177 extern int register_inetaddr_notifier(struct notifier_block *nb);
178 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
179 
180 extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
181                                         struct ipv4_devconf *devconf);
182 
183 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
184 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
185 {
186         return __ip_dev_find(net, addr, true);
187 }
188 
189 extern int              inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
190 extern int              devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
191 extern void             devinet_init(void);
192 extern struct in_device *inetdev_by_index(struct net *, int);
193 extern __be32           inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
194 extern __be32           inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
195 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
196 
197 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
198 {
199         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
200 }
201 
202 /*
203  *      Check if a mask is acceptable.
204  */
205  
206 static __inline__ int bad_mask(__be32 mask, __be32 addr)
207 {
208         __u32 hmask;
209         if (addr & (mask = ~mask))
210                 return 1;
211         hmask = ntohl(mask);
212         if (hmask & (hmask+1))
213                 return 1;
214         return 0;
215 }
216 
217 #define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
218   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
219 
220 #define for_ifa(in_dev) { struct in_ifaddr *ifa; \
221   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
222 
223 
224 #define endfor_ifa(in_dev) }
225 
226 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
227 {
228         return rcu_dereference(dev->ip_ptr);
229 }
230 
231 static inline struct in_device *in_dev_get(const struct net_device *dev)
232 {
233         struct in_device *in_dev;
234 
235         rcu_read_lock();
236         in_dev = __in_dev_get_rcu(dev);
237         if (in_dev)
238                 atomic_inc(&in_dev->refcnt);
239         rcu_read_unlock();
240         return in_dev;
241 }
242 
243 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
244 {
245         return rtnl_dereference(dev->ip_ptr);
246 }
247 
248 extern void in_dev_finish_destroy(struct in_device *idev);
249 
250 static inline void in_dev_put(struct in_device *idev)
251 {
252         if (atomic_dec_and_test(&idev->refcnt))
253                 in_dev_finish_destroy(idev);
254 }
255 
256 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
257 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
258 
259 #endif /* __KERNEL__ */
260 
261 static __inline__ __be32 inet_make_mask(int logmask)
262 {
263         if (logmask)
264                 return htonl(~((1<<(32-logmask))-1));
265         return 0;
266 }
267 
268 static __inline__ int inet_mask_len(__be32 mask)
269 {
270         __u32 hmask = ntohl(mask);
271         if (!hmask)
272                 return 0;
273         return 32 - ffz(~hmask);
274 }
275 
276 
277 #endif /* _LINUX_INETDEVICE_H */
278
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Linux/include/linux/inetdevice.h
