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 unsigned char 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 void devinet_init(void);
182 struct in_device *inetdev_by_index(struct net *, int);
183 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
184 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
185 __be32 local, int scope);
186 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
187 __be32 mask);
188 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
inet_ifa_match(__be32 addr,const struct in_ifaddr * ifa)189 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
190 {
191 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
192 }
193
194 /*
195 * Check if a mask is acceptable.
196 */
197
bad_mask(__be32 mask,__be32 addr)198 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
199 {
200 __u32 hmask;
201 if (addr & (mask = ~mask))
202 return true;
203 hmask = ntohl(mask);
204 if (hmask & (hmask+1))
205 return true;
206 return false;
207 }
208
209 #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \
210 for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \
211 ifa = rtnl_dereference(ifa->ifa_next))
212
213 #define in_dev_for_each_ifa_rcu(ifa, in_dev) \
214 for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
215 ifa = rcu_dereference(ifa->ifa_next))
216
__in_dev_get_rcu(const struct net_device * dev)217 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
218 {
219 return rcu_dereference(dev->ip_ptr);
220 }
221
in_dev_get(const struct net_device * dev)222 static inline struct in_device *in_dev_get(const struct net_device *dev)
223 {
224 struct in_device *in_dev;
225
226 rcu_read_lock();
227 in_dev = __in_dev_get_rcu(dev);
228 if (in_dev)
229 refcount_inc(&in_dev->refcnt);
230 rcu_read_unlock();
231 return in_dev;
232 }
233
__in_dev_get_rtnl(const struct net_device * dev)234 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
235 {
236 return rtnl_dereference(dev->ip_ptr);
237 }
238
239 /* called with rcu_read_lock or rtnl held */
ip_ignore_linkdown(const struct net_device * dev)240 static inline bool ip_ignore_linkdown(const struct net_device *dev)
241 {
242 struct in_device *in_dev;
243 bool rc = false;
244
245 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
246 if (in_dev &&
247 IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
248 rc = true;
249
250 return rc;
251 }
252
__in_dev_arp_parms_get_rcu(const struct net_device * dev)253 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
254 {
255 struct in_device *in_dev = __in_dev_get_rcu(dev);
256
257 return in_dev ? in_dev->arp_parms : NULL;
258 }
259
260 void in_dev_finish_destroy(struct in_device *idev);
261
in_dev_put(struct in_device * idev)262 static inline void in_dev_put(struct in_device *idev)
263 {
264 if (refcount_dec_and_test(&idev->refcnt))
265 in_dev_finish_destroy(idev);
266 }
267
268 #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
269 #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
270
271 #endif /* __KERNEL__ */
272
inet_make_mask(int logmask)273 static __inline__ __be32 inet_make_mask(int logmask)
274 {
275 if (logmask)
276 return htonl(~((1U<<(32-logmask))-1));
277 return 0;
278 }
279
inet_mask_len(__be32 mask)280 static __inline__ int inet_mask_len(__be32 mask)
281 {
282 __u32 hmask = ntohl(mask);
283 if (!hmask)
284 return 0;
285 return 32 - ffz(~hmask);
286 }
287
288
289 #endif /* _LINUX_INETDEVICE_H */
290