xref: /linux-6.15/include/linux/inetdevice.h (revision f5e4e7fd) 
1 #ifndef _LINUX_INETDEVICE_H
2 #define _LINUX_INETDEVICE_H
3 
4 #ifdef __KERNEL__
5 
6 #include <linux/bitmap.h>
7 #include <linux/if.h>
8 #include <linux/netdevice.h>
9 #include <linux/rcupdate.h>
10 #include <linux/timer.h>
11 #include <linux/sysctl.h>
12 #include <linux/rtnetlink.h>
13 
14 enum
15 {
16 	IPV4_DEVCONF_FORWARDING=1,
17 	IPV4_DEVCONF_MC_FORWARDING,
18 	IPV4_DEVCONF_PROXY_ARP,
19 	IPV4_DEVCONF_ACCEPT_REDIRECTS,
20 	IPV4_DEVCONF_SECURE_REDIRECTS,
21 	IPV4_DEVCONF_SEND_REDIRECTS,
22 	IPV4_DEVCONF_SHARED_MEDIA,
23 	IPV4_DEVCONF_RP_FILTER,
24 	IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE,
25 	IPV4_DEVCONF_BOOTP_RELAY,
26 	IPV4_DEVCONF_LOG_MARTIANS,
27 	IPV4_DEVCONF_TAG,
28 	IPV4_DEVCONF_ARPFILTER,
29 	IPV4_DEVCONF_MEDIUM_ID,
30 	IPV4_DEVCONF_NOXFRM,
31 	IPV4_DEVCONF_NOPOLICY,
32 	IPV4_DEVCONF_FORCE_IGMP_VERSION,
33 	IPV4_DEVCONF_ARP_ANNOUNCE,
34 	IPV4_DEVCONF_ARP_IGNORE,
35 	IPV4_DEVCONF_PROMOTE_SECONDARIES,
36 	IPV4_DEVCONF_ARP_ACCEPT,
37 	IPV4_DEVCONF_ARP_NOTIFY,
38 	IPV4_DEVCONF_ACCEPT_LOCAL,
39 	IPV4_DEVCONF_SRC_VMARK,
40 	IPV4_DEVCONF_PROXY_ARP_PVLAN,
41 	IPV4_DEVCONF_ROUTE_LOCALNET,
42 	__IPV4_DEVCONF_MAX
43 };
44 
45 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
46 
47 struct ipv4_devconf {
48 	void	*sysctl;
49 	int	data[IPV4_DEVCONF_MAX];
50 	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
51 };
52 
53 #define MC_HASH_SZ_LOG 9
54 
55 struct in_device {
56 	struct net_device	*dev;
57 	atomic_t		refcnt;
58 	int			dead;
59 	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
60 
61 	struct ip_mc_list __rcu	*mc_list;	/* IP multicast filter chain    */
62 	struct ip_mc_list __rcu	* __rcu *mc_hash;
63 
64 	int			mc_count;	/* Number of installed mcasts	*/
65 	spinlock_t		mc_tomb_lock;
66 	struct ip_mc_list	*mc_tomb;
67 	unsigned long		mr_v1_seen;
68 	unsigned long		mr_v2_seen;
69 	unsigned long		mr_maxdelay;
70 	unsigned char		mr_qrv;
71 	unsigned char		mr_gq_running;
72 	unsigned char		mr_ifc_count;
73 	struct timer_list	mr_gq_timer;	/* general query timer */
74 	struct timer_list	mr_ifc_timer;	/* interface change timer */
75 
76 	struct neigh_parms	*arp_parms;
77 	struct ipv4_devconf	cnf;
78 	struct rcu_head		rcu_head;
79 };
80 
81 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
82 #define IPV4_DEVCONF_ALL(net, attr) \
83 	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
84 
85 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
86 {
87 	index--;
88 	return in_dev->cnf.data[index];
89 }
90 
91 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
92 				    int val)
93 {
94 	index--;
95 	set_bit(index, in_dev->cnf.state);
96 	in_dev->cnf.data[index] = val;
97 }
98 
99 static inline void ipv4_devconf_setall(struct in_device *in_dev)
100 {
101 	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
102 }
103 
104 #define IN_DEV_CONF_GET(in_dev, attr) \
105 	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
106 #define IN_DEV_CONF_SET(in_dev, attr, val) \
107 	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
108 
109 #define IN_DEV_ANDCONF(in_dev, attr) \
110 	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
111 	 IN_DEV_CONF_GET((in_dev), attr))
112 
113 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
114 	(IPV4_DEVCONF_ALL(net, attr) || \
115 	 IN_DEV_CONF_GET((in_dev), attr))
116 
117 #define IN_DEV_ORCONF(in_dev, attr) \
118 	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
119 
120 #define IN_DEV_MAXCONF(in_dev, attr) \
121 	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
122 	     IN_DEV_CONF_GET((in_dev), attr)))
123 
124 #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
125 #define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
126 #define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
127 #define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
128 #define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
129 						       ACCEPT_SOURCE_ROUTE)
130 #define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
131 #define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
132 
133 #define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
134 #define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
135 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
136 #define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
137 #define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
138 #define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
139 						      SECURE_REDIRECTS)
140 #define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
141 #define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
142 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
143 					IN_DEV_ORCONF((in_dev), \
144 						      PROMOTE_SECONDARIES)
145 #define IN_DEV_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
146 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
147 	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
148 
149 #define IN_DEV_RX_REDIRECTS(in_dev) \
150 	((IN_DEV_FORWARD(in_dev) && \
151 	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
152 	 || (!IN_DEV_FORWARD(in_dev) && \
153 	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
154 
155 #define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
156 #define IN_DEV_ARP_ACCEPT(in_dev)	IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
157 #define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
158 #define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
159 #define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
160 
161 struct in_ifaddr {
162 	struct hlist_node	hash;
163 	struct in_ifaddr	*ifa_next;
164 	struct in_device	*ifa_dev;
165 	struct rcu_head		rcu_head;
166 	__be32			ifa_local;
167 	__be32			ifa_address;
168 	__be32			ifa_mask;
169 	__be32			ifa_broadcast;
170 	unsigned char		ifa_scope;
171 	unsigned char		ifa_flags;
172 	unsigned char		ifa_prefixlen;
173 	char			ifa_label[IFNAMSIZ];
174 
175 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
176 	__u32			ifa_valid_lft;
177 	__u32			ifa_preferred_lft;
178 	unsigned long		ifa_cstamp; /* created timestamp */
179 	unsigned long		ifa_tstamp; /* updated timestamp */
180 };
181 
182 extern int register_inetaddr_notifier(struct notifier_block *nb);
183 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
184 
185 extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
186 					struct ipv4_devconf *devconf);
187 
188 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
189 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
190 {
191 	return __ip_dev_find(net, addr, true);
192 }
193 
194 extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
195 extern int		devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
196 extern void		devinet_init(void);
197 extern struct in_device	*inetdev_by_index(struct net *, int);
198 extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
199 extern __be32		inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
200 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
201 
202 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
203 {
204 	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
205 }
206 
207 /*
208  *	Check if a mask is acceptable.
209  */
210 
211 static __inline__ int bad_mask(__be32 mask, __be32 addr)
212 {
213 	__u32 hmask;
214 	if (addr & (mask = ~mask))
215 		return 1;
216 	hmask = ntohl(mask);
217 	if (hmask & (hmask+1))
218 		return 1;
219 	return 0;
220 }
221 
222 #define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
223   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
224 
225 #define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
226   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
227 
228 
229 #define endfor_ifa(in_dev) }
230 
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 
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 		atomic_inc(&in_dev->refcnt);
244 	rcu_read_unlock();
245 	return in_dev;
246 }
247 
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 extern void in_dev_finish_destroy(struct in_device *idev);
254 
255 static inline void in_dev_put(struct in_device *idev)
256 {
257 	if (atomic_dec_and_test(&idev->refcnt))
258 		in_dev_finish_destroy(idev);
259 }
260 
261 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
262 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
263 
264 #endif /* __KERNEL__ */
265 
266 static __inline__ __be32 inet_make_mask(int logmask)
267 {
268 	if (logmask)
269 		return htonl(~((1<<(32-logmask))-1));
270 	return 0;
271 }
272 
273 static __inline__ int inet_mask_len(__be32 mask)
274 {
275 	__u32 hmask = ntohl(mask);
276 	if (!hmask)
277 		return 0;
278 	return 32 - ffz(~hmask);
279 }
280 
281 
282 #endif /* _LINUX_INETDEVICE_H */
283