xref: /linux-6.15/include/linux/inetdevice.h (revision 6ed7ffdd) 
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 struct in_device {
54 	struct net_device	*dev;
55 	atomic_t		refcnt;
56 	int			dead;
57 	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
58 	struct ip_mc_list __rcu	*mc_list;	/* IP multicast filter chain    */
59 	int			mc_count;	/* Number of installed mcasts	*/
60 	spinlock_t		mc_tomb_lock;
61 	struct ip_mc_list	*mc_tomb;
62 	unsigned long		mr_v1_seen;
63 	unsigned long		mr_v2_seen;
64 	unsigned long		mr_maxdelay;
65 	unsigned char		mr_qrv;
66 	unsigned char		mr_gq_running;
67 	unsigned char		mr_ifc_count;
68 	struct timer_list	mr_gq_timer;	/* general query timer */
69 	struct timer_list	mr_ifc_timer;	/* interface change timer */
70 
71 	struct neigh_parms	*arp_parms;
72 	struct ipv4_devconf	cnf;
73 	struct rcu_head		rcu_head;
74 };
75 
76 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
77 #define IPV4_DEVCONF_ALL(net, attr) \
78 	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
79 
80 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
81 {
82 	index--;
83 	return in_dev->cnf.data[index];
84 }
85 
86 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
87 				    int val)
88 {
89 	index--;
90 	set_bit(index, in_dev->cnf.state);
91 	in_dev->cnf.data[index] = val;
92 }
93 
94 static inline void ipv4_devconf_setall(struct in_device *in_dev)
95 {
96 	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
97 }
98 
99 #define IN_DEV_CONF_GET(in_dev, attr) \
100 	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
101 #define IN_DEV_CONF_SET(in_dev, attr, val) \
102 	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
103 
104 #define IN_DEV_ANDCONF(in_dev, attr) \
105 	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
106 	 IN_DEV_CONF_GET((in_dev), attr))
107 
108 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
109 	(IPV4_DEVCONF_ALL(net, attr) || \
110 	 IN_DEV_CONF_GET((in_dev), attr))
111 
112 #define IN_DEV_ORCONF(in_dev, attr) \
113 	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
114 
115 #define IN_DEV_MAXCONF(in_dev, attr) \
116 	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
117 	     IN_DEV_CONF_GET((in_dev), attr)))
118 
119 #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
120 #define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
121 #define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
122 #define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
123 #define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
124 						       ACCEPT_SOURCE_ROUTE)
125 #define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
126 #define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
127 
128 #define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
129 #define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
130 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
131 #define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
132 #define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
133 #define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
134 						      SECURE_REDIRECTS)
135 #define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
136 #define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
137 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
138 					IN_DEV_ORCONF((in_dev), \
139 						      PROMOTE_SECONDARIES)
140 #define IN_DEV_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
141 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
142 	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
143 
144 #define IN_DEV_RX_REDIRECTS(in_dev) \
145 	((IN_DEV_FORWARD(in_dev) && \
146 	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
147 	 || (!IN_DEV_FORWARD(in_dev) && \
148 	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
149 
150 #define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
151 #define IN_DEV_ARP_ACCEPT(in_dev)	IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
152 #define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
153 #define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
154 #define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
155 
156 struct in_ifaddr {
157 	struct hlist_node	hash;
158 	struct in_ifaddr	*ifa_next;
159 	struct in_device	*ifa_dev;
160 	struct rcu_head		rcu_head;
161 	__be32			ifa_local;
162 	__be32			ifa_address;
163 	__be32			ifa_mask;
164 	__be32			ifa_broadcast;
165 	unsigned char		ifa_scope;
166 	unsigned char		ifa_flags;
167 	unsigned char		ifa_prefixlen;
168 	char			ifa_label[IFNAMSIZ];
169 
170 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
171 	__u32			ifa_valid_lft;
172 	__u32			ifa_preferred_lft;
173 	unsigned long		ifa_cstamp; /* created timestamp */
174 	unsigned long		ifa_tstamp; /* updated timestamp */
175 };
176 
177 extern int register_inetaddr_notifier(struct notifier_block *nb);
178 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
179 
180 extern void inet_netconf_notify_devconf(struct net *net, int type, int ifindex,
181 					struct ipv4_devconf *devconf);
182 
183 extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
184 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
185 {
186 	return __ip_dev_find(net, addr, true);
187 }
188 
189 extern int		inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
190 extern int		devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
191 extern void		devinet_init(void);
192 extern struct in_device	*inetdev_by_index(struct net *, int);
193 extern __be32		inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
194 extern __be32		inet_confirm_addr(struct in_device *in_dev, __be32 dst, __be32 local, int scope);
195 extern struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, __be32 mask);
196 
197 static __inline__ int inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
198 {
199 	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
200 }
201 
202 /*
203  *	Check if a mask is acceptable.
204  */
205 
206 static __inline__ int bad_mask(__be32 mask, __be32 addr)
207 {
208 	__u32 hmask;
209 	if (addr & (mask = ~mask))
210 		return 1;
211 	hmask = ntohl(mask);
212 	if (hmask & (hmask+1))
213 		return 1;
214 	return 0;
215 }
216 
217 #define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
218   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
219 
220 #define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
221   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
222 
223 
224 #define endfor_ifa(in_dev) }
225 
226 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
227 {
228 	return rcu_dereference(dev->ip_ptr);
229 }
230 
231 static inline struct in_device *in_dev_get(const struct net_device *dev)
232 {
233 	struct in_device *in_dev;
234 
235 	rcu_read_lock();
236 	in_dev = __in_dev_get_rcu(dev);
237 	if (in_dev)
238 		atomic_inc(&in_dev->refcnt);
239 	rcu_read_unlock();
240 	return in_dev;
241 }
242 
243 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
244 {
245 	return rtnl_dereference(dev->ip_ptr);
246 }
247 
248 extern void in_dev_finish_destroy(struct in_device *idev);
249 
250 static inline void in_dev_put(struct in_device *idev)
251 {
252 	if (atomic_dec_and_test(&idev->refcnt))
253 		in_dev_finish_destroy(idev);
254 }
255 
256 #define __in_dev_put(idev)  atomic_dec(&(idev)->refcnt)
257 #define in_dev_hold(idev)   atomic_inc(&(idev)->refcnt)
258 
259 #endif /* __KERNEL__ */
260 
261 static __inline__ __be32 inet_make_mask(int logmask)
262 {
263 	if (logmask)
264 		return htonl(~((1<<(32-logmask))-1));
265 	return 0;
266 }
267 
268 static __inline__ int inet_mask_len(__be32 mask)
269 {
270 	__u32 hmask = ntohl(mask);
271 	if (!hmask)
272 		return 0;
273 	return 32 - ffz(~hmask);
274 }
275 
276 
277 #endif /* _LINUX_INETDEVICE_H */
278