1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_INETDEVICE_H
3 #define _LINUX_INETDEVICE_H
4
5 #ifdef __KERNEL__
6
7 #include <linux/bitmap.h>
8 #include <linux/if.h>
9 #include <linux/ip.h>
10 #include <linux/netdevice.h>
11 #include <linux/rcupdate.h>
12 #include <linux/timer.h>
13 #include <linux/sysctl.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/refcount.h>
16
17 struct ipv4_devconf {
18 void *sysctl;
19 int data[IPV4_DEVCONF_MAX];
20 DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
21 };
22
23 #define MC_HASH_SZ_LOG 9
24
25 struct in_device {
26 struct net_device *dev;
27 refcount_t refcnt;
28 int dead;
29 struct in_ifaddr __rcu *ifa_list;/* IP ifaddr chain */
30
31 struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
32 struct ip_mc_list __rcu * __rcu *mc_hash;
33
34 int mc_count; /* Number of installed mcasts */
35 spinlock_t mc_tomb_lock;
36 struct ip_mc_list *mc_tomb;
37 unsigned long mr_v1_seen;
38 unsigned long mr_v2_seen;
39 unsigned long mr_maxdelay;
40 unsigned long mr_qi; /* Query Interval */
41 unsigned long mr_qri; /* Query Response Interval */
42 unsigned char mr_qrv; /* Query Robustness Variable */
43 unsigned char mr_gq_running;
44 u32 mr_ifc_count;
45 struct timer_list mr_gq_timer; /* general query timer */
46 struct timer_list mr_ifc_timer; /* interface change timer */
47
48 struct neigh_parms *arp_parms;
49 struct ipv4_devconf cnf;
50 struct rcu_head rcu_head;
51 };
52
53 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
54 #define IPV4_DEVCONF_ALL(net, attr) \
55 IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
56
ipv4_devconf_get(struct in_device * in_dev,int index)57 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
58 {
59 index--;
60 return in_dev->cnf.data[index];
61 }
62
ipv4_devconf_set(struct in_device * in_dev,int index,int val)63 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
64 int val)
65 {
66 index--;
67 set_bit(index, in_dev->cnf.state);
68 in_dev->cnf.data[index] = val;
69 }
70
ipv4_devconf_setall(struct in_device * in_dev)71 static inline void ipv4_devconf_setall(struct in_device *in_dev)
72 {
73 bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
74 }
75
76 #define IN_DEV_CONF_GET(in_dev, attr) \
77 ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
78 #define IN_DEV_CONF_SET(in_dev, attr, val) \
79 ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
80
81 #define IN_DEV_ANDCONF(in_dev, attr) \
82 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
83 IN_DEV_CONF_GET((in_dev), attr))
84
85 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
86 (IPV4_DEVCONF_ALL(net, attr) || \
87 IN_DEV_CONF_GET((in_dev), attr))
88
89 #define IN_DEV_ORCONF(in_dev, attr) \
90 IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
91
92 #define IN_DEV_MAXCONF(in_dev, attr) \
93 (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
94 IN_DEV_CONF_GET((in_dev), attr)))
95
96 #define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
97 #define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
98 #define IN_DEV_BFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), BC_FORWARDING)
99 #define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
100 #define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
101 #define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
102 ACCEPT_SOURCE_ROUTE)
103 #define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
104 #define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
105
106 #define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
107 #define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
108 #define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN)
109 #define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
110 #define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
111 #define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
112 SECURE_REDIRECTS)
113 #define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
114 #define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
115 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
116 IN_DEV_ORCONF((in_dev), \
117 PROMOTE_SECONDARIES)
118 #define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
119 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
120 IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
121
122 #define IN_DEV_RX_REDIRECTS(in_dev) \
123 ((IN_DEV_FORWARD(in_dev) && \
124 IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
125 || (!IN_DEV_FORWARD(in_dev) && \
126 IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
127
128 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
129 IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
130
131 #define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
132 #define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
133 #define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
134 #define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
135 #define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
136
137 struct in_ifaddr {
138 struct hlist_node hash;
139 struct in_ifaddr __rcu *ifa_next;
140 struct in_device *ifa_dev;
141 struct rcu_head rcu_head;
142 __be32 ifa_local;
143 __be32 ifa_address;
144 __be32 ifa_mask;
145 __u32 ifa_rt_priority;
146 __be32 ifa_broadcast;
147 unsigned char ifa_scope;
148 unsigned char ifa_prefixlen;
149 __u32 ifa_flags;
150 char ifa_label[IFNAMSIZ];
151
152 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
153 __u32 ifa_valid_lft;
154 __u32 ifa_preferred_lft;
155 unsigned long ifa_cstamp; /* created timestamp */
156 unsigned long ifa_tstamp; /* updated timestamp */
157 };
158
159 struct in_validator_info {
160 __be32 ivi_addr;
161 struct in_device *ivi_dev;
162 struct netlink_ext_ack *extack;
163 };
164
165 int register_inetaddr_notifier(struct notifier_block *nb);
166 int unregister_inetaddr_notifier(struct notifier_block *nb);
167 int register_inetaddr_validator_notifier(struct notifier_block *nb);
168 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
169
170 void inet_netconf_notify_devconf(struct net *net, int event, int type,
171 int ifindex, struct ipv4_devconf *devconf);
172
173 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
ip_dev_find(struct net * net,__be32 addr)174 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
175 {
176 return __ip_dev_find(net, addr, true);
177 }
178
179 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
180 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
181 #ifdef CONFIG_INET
182 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
183 #else
inet_gifconf(struct net_device * dev,char __user * buf,int len,int size)184 static inline int inet_gifconf(struct net_device *dev, char __user *buf,
185 int len, int size)
186 {
187 return 0;
188 }
189 #endif
190 void devinet_init(void);
191 struct in_device *inetdev_by_index(struct net *, int);
192 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
193 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
194 __be32 local, int scope);
195 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
196 __be32 mask);
197 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
inet_ifa_match(__be32 addr,const struct in_ifaddr * ifa)198 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
199 {
200 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
201 }
202
203 /*
204 * Check if a mask is acceptable.
205 */
206
bad_mask(__be32 mask,__be32 addr)207 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
208 {
209 __u32 hmask;
210 if (addr & (mask = ~mask))
211 return true;
212 hmask = ntohl(mask);
213 if (hmask & (hmask+1))
214 return true;
215 return false;
216 }
217
218 #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \
219 for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \
220 ifa = rtnl_dereference(ifa->ifa_next))
221
222 #define in_dev_for_each_ifa_rcu(ifa, in_dev) \
223 for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
224 ifa = rcu_dereference(ifa->ifa_next))
225
__in_dev_get_rcu(const struct net_device * dev)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
in_dev_get(const struct net_device * dev)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 refcount_inc(&in_dev->refcnt);
239 rcu_read_unlock();
240 return in_dev;
241 }
242
__in_dev_get_rtnl(const struct net_device * dev)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 /* called with rcu_read_lock or rtnl held */
ip_ignore_linkdown(const struct net_device * dev)249 static inline bool ip_ignore_linkdown(const struct net_device *dev)
250 {
251 struct in_device *in_dev;
252 bool rc = false;
253
254 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
255 if (in_dev &&
256 IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
257 rc = true;
258
259 return rc;
260 }
261
__in_dev_arp_parms_get_rcu(const struct net_device * dev)262 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
263 {
264 struct in_device *in_dev = __in_dev_get_rcu(dev);
265
266 return in_dev ? in_dev->arp_parms : NULL;
267 }
268
269 void in_dev_finish_destroy(struct in_device *idev);
270
in_dev_put(struct in_device * idev)271 static inline void in_dev_put(struct in_device *idev)
272 {
273 if (refcount_dec_and_test(&idev->refcnt))
274 in_dev_finish_destroy(idev);
275 }
276
277 #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
278 #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
279
280 #endif /* __KERNEL__ */
281
inet_make_mask(int logmask)282 static __inline__ __be32 inet_make_mask(int logmask)
283 {
284 if (logmask)
285 return htonl(~((1U<<(32-logmask))-1));
286 return 0;
287 }
288
inet_mask_len(__be32 mask)289 static __inline__ int inet_mask_len(__be32 mask)
290 {
291 __u32 hmask = ntohl(mask);
292 if (!hmask)
293 return 0;
294 return 32 - ffz(~hmask);
295 }
296
297
298 #endif /* _LINUX_INETDEVICE_H */
299
