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
ipv4_devconf_get(struct in_device * in_dev,int index)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
ipv4_devconf_set(struct in_device * in_dev,int index,int val)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
ipv4_devconf_setall(struct in_device * in_dev)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);
ip_dev_find(struct net * net,__be32 addr)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
inet_ifa_match(__be32 addr,struct in_ifaddr * ifa)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
bad_mask(__be32 mask,__be32 addr)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
__in_dev_get_rcu(const struct net_device * dev)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
in_dev_get(const struct net_device * dev)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
__in_dev_get_rtnl(const struct net_device * dev)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
in_dev_put(struct in_device * idev)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
inet_make_mask(int logmask)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
inet_mask_len(__be32 mask)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