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 #define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \
137 ARP_EVICT_NOCARRIER)
138
139 struct in_ifaddr {
140 struct hlist_node hash;
141 struct in_ifaddr __rcu *ifa_next;
142 struct in_device *ifa_dev;
143 struct rcu_head rcu_head;
144 __be32 ifa_local;
145 __be32 ifa_address;
146 __be32 ifa_mask;
147 __u32 ifa_rt_priority;
148 __be32 ifa_broadcast;
149 unsigned char ifa_scope;
150 unsigned char ifa_prefixlen;
151 __u32 ifa_flags;
152 char ifa_label[IFNAMSIZ];
153
154 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
155 __u32 ifa_valid_lft;
156 __u32 ifa_preferred_lft;
157 unsigned long ifa_cstamp; /* created timestamp */
158 unsigned long ifa_tstamp; /* updated timestamp */
159 };
160
161 struct in_validator_info {
162 __be32 ivi_addr;
163 struct in_device *ivi_dev;
164 struct netlink_ext_ack *extack;
165 };
166
167 int register_inetaddr_notifier(struct notifier_block *nb);
168 int unregister_inetaddr_notifier(struct notifier_block *nb);
169 int register_inetaddr_validator_notifier(struct notifier_block *nb);
170 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
171
172 void inet_netconf_notify_devconf(struct net *net, int event, int type,
173 int ifindex, struct ipv4_devconf *devconf);
174
175 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
ip_dev_find(struct net * net,__be32 addr)176 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
177 {
178 return __ip_dev_find(net, addr, true);
179 }
180
181 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
182 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
183 #ifdef CONFIG_INET
184 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
185 #else
inet_gifconf(struct net_device * dev,char __user * buf,int len,int size)186 static inline int inet_gifconf(struct net_device *dev, char __user *buf,
187 int len, int size)
188 {
189 return 0;
190 }
191 #endif
192 void devinet_init(void);
193 struct in_device *inetdev_by_index(struct net *, int);
194 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
195 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
196 __be32 local, int scope);
197 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
198 __be32 mask);
199 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
inet_ifa_match(__be32 addr,const struct in_ifaddr * ifa)200 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
201 {
202 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
203 }
204
205 /*
206 * Check if a mask is acceptable.
207 */
208
bad_mask(__be32 mask,__be32 addr)209 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
210 {
211 __u32 hmask;
212 if (addr & (mask = ~mask))
213 return true;
214 hmask = ntohl(mask);
215 if (hmask & (hmask+1))
216 return true;
217 return false;
218 }
219
220 #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \
221 for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \
222 ifa = rtnl_dereference(ifa->ifa_next))
223
224 #define in_dev_for_each_ifa_rcu(ifa, in_dev) \
225 for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
226 ifa = rcu_dereference(ifa->ifa_next))
227
__in_dev_get_rcu(const struct net_device * dev)228 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
229 {
230 return rcu_dereference(dev->ip_ptr);
231 }
232
in_dev_get(const struct net_device * dev)233 static inline struct in_device *in_dev_get(const struct net_device *dev)
234 {
235 struct in_device *in_dev;
236
237 rcu_read_lock();
238 in_dev = __in_dev_get_rcu(dev);
239 if (in_dev)
240 refcount_inc(&in_dev->refcnt);
241 rcu_read_unlock();
242 return in_dev;
243 }
244
__in_dev_get_rtnl(const struct net_device * dev)245 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
246 {
247 return rtnl_dereference(dev->ip_ptr);
248 }
249
250 /* called with rcu_read_lock or rtnl held */
ip_ignore_linkdown(const struct net_device * dev)251 static inline bool ip_ignore_linkdown(const struct net_device *dev)
252 {
253 struct in_device *in_dev;
254 bool rc = false;
255
256 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
257 if (in_dev &&
258 IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
259 rc = true;
260
261 return rc;
262 }
263
__in_dev_arp_parms_get_rcu(const struct net_device * dev)264 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
265 {
266 struct in_device *in_dev = __in_dev_get_rcu(dev);
267
268 return in_dev ? in_dev->arp_parms : NULL;
269 }
270
271 void in_dev_finish_destroy(struct in_device *idev);
272
in_dev_put(struct in_device * idev)273 static inline void in_dev_put(struct in_device *idev)
274 {
275 if (refcount_dec_and_test(&idev->refcnt))
276 in_dev_finish_destroy(idev);
277 }
278
279 #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
280 #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
281
282 #endif /* __KERNEL__ */
283
inet_make_mask(int logmask)284 static __inline__ __be32 inet_make_mask(int logmask)
285 {
286 if (logmask)
287 return htonl(~((1U<<(32-logmask))-1));
288 return 0;
289 }
290
inet_mask_len(__be32 mask)291 static __inline__ int inet_mask_len(__be32 mask)
292 {
293 __u32 hmask = ntohl(mask);
294 if (!hmask)
295 return 0;
296 return 32 - ffz(~hmask);
297 }
298
299
300 #endif /* _LINUX_INETDEVICE_H */
301