xref: /openbmc/linux/include/linux/inetdevice.h (revision 8ee90c5c)
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/ip.h>
9 #include <linux/netdevice.h>
10 #include <linux/rcupdate.h>
11 #include <linux/timer.h>
12 #include <linux/sysctl.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/refcount.h>
15 
16 struct ipv4_devconf {
17 	void	*sysctl;
18 	int	data[IPV4_DEVCONF_MAX];
19 	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
20 };
21 
22 #define MC_HASH_SZ_LOG 9
23 
24 struct in_device {
25 	struct net_device	*dev;
26 	refcount_t		refcnt;
27 	int			dead;
28 	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
29 
30 	struct ip_mc_list __rcu	*mc_list;	/* IP multicast filter chain    */
31 	struct ip_mc_list __rcu	* __rcu *mc_hash;
32 
33 	int			mc_count;	/* Number of installed mcasts	*/
34 	spinlock_t		mc_tomb_lock;
35 	struct ip_mc_list	*mc_tomb;
36 	unsigned long		mr_v1_seen;
37 	unsigned long		mr_v2_seen;
38 	unsigned long		mr_maxdelay;
39 	unsigned char		mr_qrv;
40 	unsigned char		mr_gq_running;
41 	unsigned char		mr_ifc_count;
42 	struct timer_list	mr_gq_timer;	/* general query timer */
43 	struct timer_list	mr_ifc_timer;	/* interface change timer */
44 
45 	struct neigh_parms	*arp_parms;
46 	struct ipv4_devconf	cnf;
47 	struct rcu_head		rcu_head;
48 };
49 
50 #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
51 #define IPV4_DEVCONF_ALL(net, attr) \
52 	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
53 
54 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
55 {
56 	index--;
57 	return in_dev->cnf.data[index];
58 }
59 
60 static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
61 				    int val)
62 {
63 	index--;
64 	set_bit(index, in_dev->cnf.state);
65 	in_dev->cnf.data[index] = val;
66 }
67 
68 static inline void ipv4_devconf_setall(struct in_device *in_dev)
69 {
70 	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
71 }
72 
73 #define IN_DEV_CONF_GET(in_dev, attr) \
74 	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
75 #define IN_DEV_CONF_SET(in_dev, attr, val) \
76 	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
77 
78 #define IN_DEV_ANDCONF(in_dev, attr) \
79 	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
80 	 IN_DEV_CONF_GET((in_dev), attr))
81 
82 #define IN_DEV_NET_ORCONF(in_dev, net, attr) \
83 	(IPV4_DEVCONF_ALL(net, attr) || \
84 	 IN_DEV_CONF_GET((in_dev), attr))
85 
86 #define IN_DEV_ORCONF(in_dev, attr) \
87 	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
88 
89 #define IN_DEV_MAXCONF(in_dev, attr) \
90 	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
91 	     IN_DEV_CONF_GET((in_dev), attr)))
92 
93 #define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
94 #define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
95 #define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
96 #define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
97 #define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
98 						       ACCEPT_SOURCE_ROUTE)
99 #define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
100 #define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
101 
102 #define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
103 #define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
104 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
105 #define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
106 #define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
107 #define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
108 						      SECURE_REDIRECTS)
109 #define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
110 #define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
111 #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
112 					IN_DEV_ORCONF((in_dev), \
113 						      PROMOTE_SECONDARIES)
114 #define IN_DEV_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
115 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
116 	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
117 
118 #define IN_DEV_RX_REDIRECTS(in_dev) \
119 	((IN_DEV_FORWARD(in_dev) && \
120 	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
121 	 || (!IN_DEV_FORWARD(in_dev) && \
122 	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
123 
124 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
125 	IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
126 
127 #define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
128 #define IN_DEV_ARP_ACCEPT(in_dev)	IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
129 #define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
130 #define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
131 #define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
132 
133 struct in_ifaddr {
134 	struct hlist_node	hash;
135 	struct in_ifaddr	*ifa_next;
136 	struct in_device	*ifa_dev;
137 	struct rcu_head		rcu_head;
138 	__be32			ifa_local;
139 	__be32			ifa_address;
140 	__be32			ifa_mask;
141 	__be32			ifa_broadcast;
142 	unsigned char		ifa_scope;
143 	unsigned char		ifa_prefixlen;
144 	__u32			ifa_flags;
145 	char			ifa_label[IFNAMSIZ];
146 
147 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
148 	__u32			ifa_valid_lft;
149 	__u32			ifa_preferred_lft;
150 	unsigned long		ifa_cstamp; /* created timestamp */
151 	unsigned long		ifa_tstamp; /* updated timestamp */
152 };
153 
154 struct in_validator_info {
155 	__be32			ivi_addr;
156 	struct in_device	*ivi_dev;
157 };
158 
159 int register_inetaddr_notifier(struct notifier_block *nb);
160 int unregister_inetaddr_notifier(struct notifier_block *nb);
161 int register_inetaddr_validator_notifier(struct notifier_block *nb);
162 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
163 
164 void inet_netconf_notify_devconf(struct net *net, int event, int type,
165 				 int ifindex, struct ipv4_devconf *devconf);
166 
167 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
168 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
169 {
170 	return __ip_dev_find(net, addr, true);
171 }
172 
173 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
174 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
175 void devinet_init(void);
176 struct in_device *inetdev_by_index(struct net *, int);
177 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
178 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
179 			 __be32 local, int scope);
180 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
181 				    __be32 mask);
182 static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
183 {
184 	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
185 }
186 
187 /*
188  *	Check if a mask is acceptable.
189  */
190 
191 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
192 {
193 	__u32 hmask;
194 	if (addr & (mask = ~mask))
195 		return true;
196 	hmask = ntohl(mask);
197 	if (hmask & (hmask+1))
198 		return true;
199 	return false;
200 }
201 
202 #define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
203   for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
204 
205 #define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
206   for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
207 
208 
209 #define endfor_ifa(in_dev) }
210 
211 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
212 {
213 	return rcu_dereference(dev->ip_ptr);
214 }
215 
216 static inline struct in_device *in_dev_get(const struct net_device *dev)
217 {
218 	struct in_device *in_dev;
219 
220 	rcu_read_lock();
221 	in_dev = __in_dev_get_rcu(dev);
222 	if (in_dev)
223 		refcount_inc(&in_dev->refcnt);
224 	rcu_read_unlock();
225 	return in_dev;
226 }
227 
228 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
229 {
230 	return rtnl_dereference(dev->ip_ptr);
231 }
232 
233 static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
234 {
235 	struct in_device *in_dev = __in_dev_get_rcu(dev);
236 
237 	return in_dev ? in_dev->arp_parms : NULL;
238 }
239 
240 void in_dev_finish_destroy(struct in_device *idev);
241 
242 static inline void in_dev_put(struct in_device *idev)
243 {
244 	if (refcount_dec_and_test(&idev->refcnt))
245 		in_dev_finish_destroy(idev);
246 }
247 
248 #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
249 #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
250 
251 #endif /* __KERNEL__ */
252 
253 static __inline__ __be32 inet_make_mask(int logmask)
254 {
255 	if (logmask)
256 		return htonl(~((1U<<(32-logmask))-1));
257 	return 0;
258 }
259 
260 static __inline__ int inet_mask_len(__be32 mask)
261 {
262 	__u32 hmask = ntohl(mask);
263 	if (!hmask)
264 		return 0;
265 	return 32 - ffz(~hmask);
266 }
267 
268 
269 #endif /* _LINUX_INETDEVICE_H */
270