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 netdevice_tracker dev_tracker;
28
29 refcount_t refcnt;
30 int dead;
31 struct in_ifaddr __rcu *ifa_list;/* IP ifaddr chain */
32
33 struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
34 struct ip_mc_list __rcu * __rcu *mc_hash;
35
36 int mc_count; /* Number of installed mcasts */
37 spinlock_t mc_tomb_lock;
38 struct ip_mc_list *mc_tomb;
39 unsigned long mr_v1_seen;
40 unsigned long mr_v2_seen;
41 unsigned long mr_maxdelay;
42 unsigned long mr_qi; /* Query Interval */
43 unsigned long mr_qri; /* Query Response Interval */
44 unsigned char mr_qrv; /* Query Robustness Variable */
45 unsigned char mr_gq_running;
46 u32 mr_ifc_count;
47 struct timer_list mr_gq_timer; /* general query timer */
48 struct timer_list mr_ifc_timer; /* interface change timer */
49
50 struct neigh_parms *arp_parms;
51 struct ipv4_devconf cnf;
52 struct rcu_head rcu_head;
53 };
54
55 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
56 #define IPV4_DEVCONF_ALL(net, attr) \
57 IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
58
ipv4_devconf_get(struct in_device * in_dev,int index)59 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
60 {
61 index--;
62 return in_dev->cnf.data[index];
63 }
64
ipv4_devconf_set(struct in_device * in_dev,int index,int val)65 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
66 int val)
67 {
68 index--;
69 set_bit(index, in_dev->cnf.state);
70 in_dev->cnf.data[index] = val;
71 }
72
ipv4_devconf_setall(struct in_device * in_dev)73 static inline void ipv4_devconf_setall(struct in_device *in_dev)
74 {
75 bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
76 }
77
78 #define IN_DEV_CONF_GET(in_dev, attr) \
79 ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
80 #define IN_DEV_CONF_SET(in_dev, attr, val) \
81 ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
82
83 #define IN_DEV_ANDCONF(in_dev, attr) \
84 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
85 IN_DEV_CONF_GET((in_dev), attr))
86
87 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
88 (IPV4_DEVCONF_ALL(net, attr) || \
89 IN_DEV_CONF_GET((in_dev), attr))
90
91 #define IN_DEV_ORCONF(in_dev, attr) \
92 IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
93
94 #define IN_DEV_MAXCONF(in_dev, attr) \
95 (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
96 IN_DEV_CONF_GET((in_dev), attr)))
97
98 #define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
99 #define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
100 #define IN_DEV_BFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), BC_FORWARDING)
101 #define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
102 #define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
103 #define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
104 ACCEPT_SOURCE_ROUTE)
105 #define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
106 #define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
107
108 #define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
109 #define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
110 #define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN)
111 #define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
112 #define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
113 #define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
114 SECURE_REDIRECTS)
115 #define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
116 #define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
117 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
118 IN_DEV_ORCONF((in_dev), \
119 PROMOTE_SECONDARIES)
120 #define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
121 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
122 IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
123
124 #define IN_DEV_RX_REDIRECTS(in_dev) \
125 ((IN_DEV_FORWARD(in_dev) && \
126 IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
127 || (!IN_DEV_FORWARD(in_dev) && \
128 IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
129
130 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
131 IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
132
133 #define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
134 #define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ACCEPT)
135 #define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
136 #define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
137 #define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
138 #define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \
139 ARP_EVICT_NOCARRIER)
140
141 struct in_ifaddr {
142 struct hlist_node hash;
143 struct in_ifaddr __rcu *ifa_next;
144 struct in_device *ifa_dev;
145 struct rcu_head rcu_head;
146 __be32 ifa_local;
147 __be32 ifa_address;
148 __be32 ifa_mask;
149 __u32 ifa_rt_priority;
150 __be32 ifa_broadcast;
151 unsigned char ifa_scope;
152 unsigned char ifa_prefixlen;
153 unsigned char ifa_proto;
154 __u32 ifa_flags;
155 char ifa_label[IFNAMSIZ];
156
157 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
158 __u32 ifa_valid_lft;
159 __u32 ifa_preferred_lft;
160 unsigned long ifa_cstamp; /* created timestamp */
161 unsigned long ifa_tstamp; /* updated timestamp */
162 };
163
164 struct in_validator_info {
165 __be32 ivi_addr;
166 struct in_device *ivi_dev;
167 struct netlink_ext_ack *extack;
168 };
169
170 int register_inetaddr_notifier(struct notifier_block *nb);
171 int unregister_inetaddr_notifier(struct notifier_block *nb);
172 int register_inetaddr_validator_notifier(struct notifier_block *nb);
173 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
174
175 void inet_netconf_notify_devconf(struct net *net, int event, int type,
176 int ifindex, struct ipv4_devconf *devconf);
177
178 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
ip_dev_find(struct net * net,__be32 addr)179 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
180 {
181 return __ip_dev_find(net, addr, true);
182 }
183
184 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
185 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
186 #ifdef CONFIG_INET
187 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
188 #else
inet_gifconf(struct net_device * dev,char __user * buf,int len,int size)189 static inline int inet_gifconf(struct net_device *dev, char __user *buf,
190 int len, int size)
191 {
192 return 0;
193 }
194 #endif
195 void devinet_init(void);
196 struct in_device *inetdev_by_index(struct net *, int);
197 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
198 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
199 __be32 local, int scope);
200 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
201 __be32 mask);
202 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
inet_ifa_match(__be32 addr,const struct in_ifaddr * ifa)203 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
204 {
205 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
206 }
207
208 /*
209 * Check if a mask is acceptable.
210 */
211
bad_mask(__be32 mask,__be32 addr)212 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
213 {
214 __u32 hmask;
215 if (addr & (mask = ~mask))
216 return true;
217 hmask = ntohl(mask);
218 if (hmask & (hmask+1))
219 return true;
220 return false;
221 }
222
223 #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \
224 for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \
225 ifa = rtnl_dereference(ifa->ifa_next))
226
227 #define in_dev_for_each_ifa_rcu(ifa, in_dev) \
228 for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
229 ifa = rcu_dereference(ifa->ifa_next))
230
__in_dev_get_rcu(const struct net_device * dev)231 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
232 {
233 return rcu_dereference(dev->ip_ptr);
234 }
235
in_dev_get(const struct net_device * dev)236 static inline struct in_device *in_dev_get(const struct net_device *dev)
237 {
238 struct in_device *in_dev;
239
240 rcu_read_lock();
241 in_dev = __in_dev_get_rcu(dev);
242 if (in_dev)
243 refcount_inc(&in_dev->refcnt);
244 rcu_read_unlock();
245 return in_dev;
246 }
247
__in_dev_get_rtnl(const struct net_device * dev)248 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
249 {
250 return rtnl_dereference(dev->ip_ptr);
251 }
252
253 /* called with rcu_read_lock or rtnl held */
ip_ignore_linkdown(const struct net_device * dev)254 static inline bool ip_ignore_linkdown(const struct net_device *dev)
255 {
256 struct in_device *in_dev;
257 bool rc = false;
258
259 in_dev = rcu_dereference_rtnl(dev->ip_ptr);
260 if (in_dev &&
261 IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
262 rc = true;
263
264 return rc;
265 }
266
__in_dev_arp_parms_get_rcu(const struct net_device * dev)267 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
268 {
269 struct in_device *in_dev = __in_dev_get_rcu(dev);
270
271 return in_dev ? in_dev->arp_parms : NULL;
272 }
273
274 void in_dev_finish_destroy(struct in_device *idev);
275
in_dev_put(struct in_device * idev)276 static inline void in_dev_put(struct in_device *idev)
277 {
278 if (refcount_dec_and_test(&idev->refcnt))
279 in_dev_finish_destroy(idev);
280 }
281
282 #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
283 #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
284
285 #endif /* __KERNEL__ */
286
inet_make_mask(int logmask)287 static __inline__ __be32 inet_make_mask(int logmask)
288 {
289 if (logmask)
290 return htonl(~((1U<<(32-logmask))-1));
291 return 0;
292 }
293
inet_mask_len(__be32 mask)294 static __inline__ int inet_mask_len(__be32 mask)
295 {
296 __u32 hmask = ntohl(mask);
297 if (!hmask)
298 return 0;
299 return 32 - ffz(~hmask);
300 }
301
302
303 #endif /* _LINUX_INETDEVICE_H */
304