xref: /linux/include/linux/inetdevice.h (revision 79790b6818e96c58fe2bffee1b418c16e64e7b80)
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_RO(cnf, attr) READ_ONCE(IPV4_DEVCONF(cnf, attr))
57 #define IPV4_DEVCONF_ALL(net, attr) \
58 	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
59 #define IPV4_DEVCONF_ALL_RO(net, attr) READ_ONCE(IPV4_DEVCONF_ALL(net, attr))
60 
ipv4_devconf_get(const struct in_device * in_dev,int index)61 static inline int ipv4_devconf_get(const struct in_device *in_dev, int index)
62 {
63 	index--;
64 	return READ_ONCE(in_dev->cnf.data[index]);
65 }
66 
ipv4_devconf_set(struct in_device * in_dev,int index,int val)67 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
68 				    int val)
69 {
70 	index--;
71 	set_bit(index, in_dev->cnf.state);
72 	WRITE_ONCE(in_dev->cnf.data[index], val);
73 }
74 
ipv4_devconf_setall(struct in_device * in_dev)75 static inline void ipv4_devconf_setall(struct in_device *in_dev)
76 {
77 	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
78 }
79 
80 #define IN_DEV_CONF_GET(in_dev, attr) \
81 	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
82 #define IN_DEV_CONF_SET(in_dev, attr, val) \
83 	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
84 
85 #define IN_DEV_ANDCONF(in_dev, attr) \
86 	(IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr) && \
87 	 IN_DEV_CONF_GET((in_dev), attr))
88 
89 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
90 	(IPV4_DEVCONF_ALL_RO(net, attr) || \
91 	 IN_DEV_CONF_GET((in_dev), attr))
92 
93 #define IN_DEV_ORCONF(in_dev, attr) \
94 	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
95 
96 #define IN_DEV_MAXCONF(in_dev, attr) \
97 	(max(IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), attr), \
98 	     IN_DEV_CONF_GET((in_dev), attr)))
99 
100 #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
101 #define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
102 #define IN_DEV_BFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), BC_FORWARDING)
103 #define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
104 #define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
105 #define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
106 						       ACCEPT_SOURCE_ROUTE)
107 #define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
108 #define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
109 
110 #define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
111 #define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
112 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN)
113 #define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
114 #define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
115 #define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
116 						      SECURE_REDIRECTS)
117 #define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
118 #define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
119 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
120 					IN_DEV_ORCONF((in_dev), \
121 						      PROMOTE_SECONDARIES)
122 #define IN_DEV_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
123 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
124 	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
125 
126 #define IN_DEV_RX_REDIRECTS(in_dev) \
127 	((IN_DEV_FORWARD(in_dev) && \
128 	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
129 	 || (!IN_DEV_FORWARD(in_dev) && \
130 	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
131 
132 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
133 	IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
134 
135 #define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
136 #define IN_DEV_ARP_ACCEPT(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ACCEPT)
137 #define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
138 #define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
139 #define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
140 #define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \
141 							  ARP_EVICT_NOCARRIER)
142 
143 struct in_ifaddr {
144 	struct hlist_node	hash;
145 	struct in_ifaddr	__rcu *ifa_next;
146 	struct in_device	*ifa_dev;
147 	struct rcu_head		rcu_head;
148 	__be32			ifa_local;
149 	__be32			ifa_address;
150 	__be32			ifa_mask;
151 	__u32			ifa_rt_priority;
152 	__be32			ifa_broadcast;
153 	unsigned char		ifa_scope;
154 	unsigned char		ifa_prefixlen;
155 	unsigned char		ifa_proto;
156 	__u32			ifa_flags;
157 	char			ifa_label[IFNAMSIZ];
158 
159 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
160 	__u32			ifa_valid_lft;
161 	__u32			ifa_preferred_lft;
162 	unsigned long		ifa_cstamp; /* created timestamp */
163 	unsigned long		ifa_tstamp; /* updated timestamp */
164 };
165 
166 struct in_validator_info {
167 	__be32			ivi_addr;
168 	struct in_device	*ivi_dev;
169 	struct netlink_ext_ack	*extack;
170 };
171 
172 int register_inetaddr_notifier(struct notifier_block *nb);
173 int unregister_inetaddr_notifier(struct notifier_block *nb);
174 int register_inetaddr_validator_notifier(struct notifier_block *nb);
175 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
176 
177 void inet_netconf_notify_devconf(struct net *net, int event, int type,
178 				 int ifindex, struct ipv4_devconf *devconf);
179 
180 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
ip_dev_find(struct net * net,__be32 addr)181 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
182 {
183 	return __ip_dev_find(net, addr, true);
184 }
185 
186 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
187 int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
188 #ifdef CONFIG_INET
189 int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size);
190 #else
inet_gifconf(struct net_device * dev,char __user * buf,int len,int size)191 static inline int inet_gifconf(struct net_device *dev, char __user *buf,
192 			       int len, int size)
193 {
194 	return 0;
195 }
196 #endif
197 void devinet_init(void);
198 struct in_device *inetdev_by_index(struct net *, int);
199 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
200 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
201 			 __be32 local, int scope);
202 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
203 				    __be32 mask);
204 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
inet_ifa_match(__be32 addr,const struct in_ifaddr * ifa)205 static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
206 {
207 	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
208 }
209 
210 /*
211  *	Check if a mask is acceptable.
212  */
213 
bad_mask(__be32 mask,__be32 addr)214 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
215 {
216 	__u32 hmask;
217 	if (addr & (mask = ~mask))
218 		return true;
219 	hmask = ntohl(mask);
220 	if (hmask & (hmask+1))
221 		return true;
222 	return false;
223 }
224 
225 #define in_dev_for_each_ifa_rtnl(ifa, in_dev)			\
226 	for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa;	\
227 	     ifa = rtnl_dereference(ifa->ifa_next))
228 
229 #define in_dev_for_each_ifa_rcu(ifa, in_dev)			\
230 	for (ifa = rcu_dereference((in_dev)->ifa_list); ifa;	\
231 	     ifa = rcu_dereference(ifa->ifa_next))
232 
__in_dev_get_rcu(const struct net_device * dev)233 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
234 {
235 	return rcu_dereference(dev->ip_ptr);
236 }
237 
in_dev_get(const struct net_device * dev)238 static inline struct in_device *in_dev_get(const struct net_device *dev)
239 {
240 	struct in_device *in_dev;
241 
242 	rcu_read_lock();
243 	in_dev = __in_dev_get_rcu(dev);
244 	if (in_dev)
245 		refcount_inc(&in_dev->refcnt);
246 	rcu_read_unlock();
247 	return in_dev;
248 }
249 
__in_dev_get_rtnl(const struct net_device * dev)250 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
251 {
252 	return rtnl_dereference(dev->ip_ptr);
253 }
254 
255 /* called with rcu_read_lock or rtnl held */
ip_ignore_linkdown(const struct net_device * dev)256 static inline bool ip_ignore_linkdown(const struct net_device *dev)
257 {
258 	struct in_device *in_dev;
259 	bool rc = false;
260 
261 	in_dev = rcu_dereference_rtnl(dev->ip_ptr);
262 	if (in_dev &&
263 	    IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
264 		rc = true;
265 
266 	return rc;
267 }
268 
__in_dev_arp_parms_get_rcu(const struct net_device * dev)269 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
270 {
271 	struct in_device *in_dev = __in_dev_get_rcu(dev);
272 
273 	return in_dev ? in_dev->arp_parms : NULL;
274 }
275 
276 void in_dev_finish_destroy(struct in_device *idev);
277 
in_dev_put(struct in_device * idev)278 static inline void in_dev_put(struct in_device *idev)
279 {
280 	if (refcount_dec_and_test(&idev->refcnt))
281 		in_dev_finish_destroy(idev);
282 }
283 
284 #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
285 #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
286 
287 #endif /* __KERNEL__ */
288 
inet_make_mask(int logmask)289 static __inline__ __be32 inet_make_mask(int logmask)
290 {
291 	if (logmask)
292 		return htonl(~((1U<<(32-logmask))-1));
293 	return 0;
294 }
295 
inet_mask_len(__be32 mask)296 static __inline__ int inet_mask_len(__be32 mask)
297 {
298 	__u32 hmask = ntohl(mask);
299 	if (!hmask)
300 		return 0;
301 	return 32 - ffz(~hmask);
302 }
303 
304 
305 #endif /* _LINUX_INETDEVICE_H */
306