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