inetdevice.h 8.35 KB
Newer Older
1
/* SPDX-License-Identifier: GPL-2.0 */
Linus Torvalds's avatar
Linus Torvalds committed
2 3 4 5 6
#ifndef _LINUX_INETDEVICE_H
#define _LINUX_INETDEVICE_H

#ifdef __KERNEL__

7
#include <linux/bitmap.h>
Linus Torvalds's avatar
Linus Torvalds committed
8
#include <linux/if.h>
9
#include <linux/ip.h>
Linus Torvalds's avatar
Linus Torvalds committed
10 11 12
#include <linux/netdevice.h>
#include <linux/rcupdate.h>
#include <linux/timer.h>
13
#include <linux/sysctl.h>
Eric Dumazet's avatar
Eric Dumazet committed
14
#include <linux/rtnetlink.h>
15
#include <linux/refcount.h>
Linus Torvalds's avatar
Linus Torvalds committed
16

17
struct ipv4_devconf {
Linus Torvalds's avatar
Linus Torvalds committed
18
	void	*sysctl;
19 20
	int	data[IPV4_DEVCONF_MAX];
	DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
Linus Torvalds's avatar
Linus Torvalds committed
21 22
};

23 24
#define MC_HASH_SZ_LOG 9

25
struct in_device {
Linus Torvalds's avatar
Linus Torvalds committed
26
	struct net_device	*dev;
27
	refcount_t		refcnt;
Linus Torvalds's avatar
Linus Torvalds committed
28 29
	int			dead;
	struct in_ifaddr	*ifa_list;	/* IP ifaddr chain		*/
30

31
	struct ip_mc_list __rcu	*mc_list;	/* IP multicast filter chain    */
32 33
	struct ip_mc_list __rcu	* __rcu *mc_hash;

34
	int			mc_count;	/* Number of installed mcasts	*/
Linus Torvalds's avatar
Linus Torvalds committed
35 36 37 38 39
	spinlock_t		mc_tomb_lock;
	struct ip_mc_list	*mc_tomb;
	unsigned long		mr_v1_seen;
	unsigned long		mr_v2_seen;
	unsigned long		mr_maxdelay;
40 41 42
	unsigned long		mr_qi;		/* Query Interval */
	unsigned long		mr_qri;		/* Query Response Interval */
	unsigned char		mr_qrv;		/* Query Robustness Variable */
Linus Torvalds's avatar
Linus Torvalds committed
43 44 45 46 47 48 49 50 51 52
	unsigned char		mr_gq_running;
	unsigned char		mr_ifc_count;
	struct timer_list	mr_gq_timer;	/* general query timer */
	struct timer_list	mr_ifc_timer;	/* interface change timer */

	struct neigh_parms	*arp_parms;
	struct ipv4_devconf	cnf;
	struct rcu_head		rcu_head;
};

53
#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
54 55
#define IPV4_DEVCONF_ALL(net, attr) \
	IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
56 57 58 59 60 61 62 63 64 65 66

static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
{
	index--;
	return in_dev->cnf.data[index];
}

static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
				    int val)
{
	index--;
67
	set_bit(index, in_dev->cnf.state);
68 69 70
	in_dev->cnf.data[index] = val;
}

71 72
static inline void ipv4_devconf_setall(struct in_device *in_dev)
{
73
	bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
74 75
}

76
#define IN_DEV_CONF_GET(in_dev, attr) \
77
	ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
78
#define IN_DEV_CONF_SET(in_dev, attr, val) \
79
	ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
80 81

#define IN_DEV_ANDCONF(in_dev, attr) \
82
	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
83
	 IN_DEV_CONF_GET((in_dev), attr))
84 85 86

#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
	(IPV4_DEVCONF_ALL(net, attr) || \
87
	 IN_DEV_CONF_GET((in_dev), attr))
88 89 90 91

#define IN_DEV_ORCONF(in_dev, attr) \
	IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)

92
#define IN_DEV_MAXCONF(in_dev, attr) \
93
	(max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
94
	     IN_DEV_CONF_GET((in_dev), attr)))
95 96

#define IN_DEV_FORWARD(in_dev)		IN_DEV_CONF_GET((in_dev), FORWARDING)
97
#define IN_DEV_MFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
98
#define IN_DEV_BFORWARD(in_dev)		IN_DEV_ANDCONF((in_dev), BC_FORWARDING)
99
#define IN_DEV_RPFILTER(in_dev)		IN_DEV_MAXCONF((in_dev), RP_FILTER)
100
#define IN_DEV_SRC_VMARK(in_dev)    	IN_DEV_ORCONF((in_dev), SRC_VMARK)
101 102
#define IN_DEV_SOURCE_ROUTE(in_dev)	IN_DEV_ANDCONF((in_dev), \
						       ACCEPT_SOURCE_ROUTE)
103
#define IN_DEV_ACCEPT_LOCAL(in_dev)	IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
104 105 106 107
#define IN_DEV_BOOTP_RELAY(in_dev)	IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)

#define IN_DEV_LOG_MARTIANS(in_dev)	IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
#define IN_DEV_PROXY_ARP(in_dev)	IN_DEV_ORCONF((in_dev), PROXY_ARP)
108
#define IN_DEV_PROXY_ARP_PVLAN(in_dev)	IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
109 110 111 112 113 114 115 116 117
#define IN_DEV_SHARED_MEDIA(in_dev)	IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
#define IN_DEV_TX_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
#define IN_DEV_SEC_REDIRECTS(in_dev)	IN_DEV_ORCONF((in_dev), \
						      SECURE_REDIRECTS)
#define IN_DEV_IDTAG(in_dev)		IN_DEV_CONF_GET(in_dev, TAG)
#define IN_DEV_MEDIUM_ID(in_dev)	IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
					IN_DEV_ORCONF((in_dev), \
						      PROMOTE_SECONDARIES)
118
#define IN_DEV_ROUTE_LOCALNET(in_dev)	IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
119 120
#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)	\
	IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
Linus Torvalds's avatar
Linus Torvalds committed
121 122 123

#define IN_DEV_RX_REDIRECTS(in_dev) \
	((IN_DEV_FORWARD(in_dev) && \
124
	  IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
Linus Torvalds's avatar
Linus Torvalds committed
125
	 || (!IN_DEV_FORWARD(in_dev) && \
126
	  IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
Linus Torvalds's avatar
Linus Torvalds committed
127

128 129 130
#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
	IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)

131
#define IN_DEV_ARPFILTER(in_dev)	IN_DEV_ORCONF((in_dev), ARPFILTER)
132
#define IN_DEV_ARP_ACCEPT(in_dev)	IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
133 134
#define IN_DEV_ARP_ANNOUNCE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
#define IN_DEV_ARP_IGNORE(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
135
#define IN_DEV_ARP_NOTIFY(in_dev)	IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
Linus Torvalds's avatar
Linus Torvalds committed
136

137
struct in_ifaddr {
138
	struct hlist_node	hash;
Linus Torvalds's avatar
Linus Torvalds committed
139 140 141
	struct in_ifaddr	*ifa_next;
	struct in_device	*ifa_dev;
	struct rcu_head		rcu_head;
142 143 144
	__be32			ifa_local;
	__be32			ifa_address;
	__be32			ifa_mask;
145
	__u32			ifa_rt_priority;
146
	__be32			ifa_broadcast;
Linus Torvalds's avatar
Linus Torvalds committed
147 148
	unsigned char		ifa_scope;
	unsigned char		ifa_prefixlen;
149
	__u32			ifa_flags;
Linus Torvalds's avatar
Linus Torvalds committed
150
	char			ifa_label[IFNAMSIZ];
151 152 153 154 155 156

	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
	__u32			ifa_valid_lft;
	__u32			ifa_preferred_lft;
	unsigned long		ifa_cstamp; /* created timestamp */
	unsigned long		ifa_tstamp; /* updated timestamp */
Linus Torvalds's avatar
Linus Torvalds committed
157 158
};

159 160 161
struct in_validator_info {
	__be32			ivi_addr;
	struct in_device	*ivi_dev;
162
	struct netlink_ext_ack	*extack;
163 164
};

165 166
int register_inetaddr_notifier(struct notifier_block *nb);
int unregister_inetaddr_notifier(struct notifier_block *nb);
167 168
int register_inetaddr_validator_notifier(struct notifier_block *nb);
int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
Linus Torvalds's avatar
Linus Torvalds committed
169

170 171
void inet_netconf_notify_devconf(struct net *net, int event, int type,
				 int ifindex, struct ipv4_devconf *devconf);
172

173
struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
174 175 176 177 178
static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
{
	return __ip_dev_find(net, addr, true);
}

179
int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
180
int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
181 182 183
void devinet_init(void);
struct in_device *inetdev_by_index(struct net *, int);
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
184 185
__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
			 __be32 local, int scope);
186 187
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
				    __be32 mask);
188
struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
189
static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
Linus Torvalds's avatar
Linus Torvalds committed
190 191 192 193 194 195 196 197
{
	return !((addr^ifa->ifa_address)&ifa->ifa_mask);
}

/*
 *	Check if a mask is acceptable.
 */
 
198
static __inline__ bool bad_mask(__be32 mask, __be32 addr)
Linus Torvalds's avatar
Linus Torvalds committed
199
{
200
	__u32 hmask;
Linus Torvalds's avatar
Linus Torvalds committed
201
	if (addr & (mask = ~mask))
202
		return true;
203 204
	hmask = ntohl(mask);
	if (hmask & (hmask+1))
205 206
		return true;
	return false;
Linus Torvalds's avatar
Linus Torvalds committed
207 208 209 210 211 212 213 214 215 216 217
}

#define for_primary_ifa(in_dev)	{ struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)

#define for_ifa(in_dev)	{ struct in_ifaddr *ifa; \
  for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)


#define endfor_ifa(in_dev) }

218 219
static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
{
Eric Dumazet's avatar
Eric Dumazet committed
220
	return rcu_dereference(dev->ip_ptr);
221 222
}

Eric Dumazet's avatar
Eric Dumazet committed
223
static inline struct in_device *in_dev_get(const struct net_device *dev)
Linus Torvalds's avatar
Linus Torvalds committed
224 225 226 227
{
	struct in_device *in_dev;

	rcu_read_lock();
228
	in_dev = __in_dev_get_rcu(dev);
Linus Torvalds's avatar
Linus Torvalds committed
229
	if (in_dev)
230
		refcount_inc(&in_dev->refcnt);
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234
	rcu_read_unlock();
	return in_dev;
}

Eric Dumazet's avatar
Eric Dumazet committed
235
static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
Linus Torvalds's avatar
Linus Torvalds committed
236
{
237
	return rtnl_dereference(dev->ip_ptr);
Linus Torvalds's avatar
Linus Torvalds committed
238 239
}

240 241 242 243 244 245 246
static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
{
	struct in_device *in_dev = __in_dev_get_rcu(dev);

	return in_dev ? in_dev->arp_parms : NULL;
}

247
void in_dev_finish_destroy(struct in_device *idev);
Linus Torvalds's avatar
Linus Torvalds committed
248 249 250

static inline void in_dev_put(struct in_device *idev)
{
251
	if (refcount_dec_and_test(&idev->refcnt))
Linus Torvalds's avatar
Linus Torvalds committed
252 253 254
		in_dev_finish_destroy(idev);
}

255 256
#define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
#define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
Linus Torvalds's avatar
Linus Torvalds committed
257 258 259

#endif /* __KERNEL__ */

260
static __inline__ __be32 inet_make_mask(int logmask)
Linus Torvalds's avatar
Linus Torvalds committed
261 262
{
	if (logmask)
263
		return htonl(~((1U<<(32-logmask))-1));
Linus Torvalds's avatar
Linus Torvalds committed
264 265 266
	return 0;
}

267
static __inline__ int inet_mask_len(__be32 mask)
Linus Torvalds's avatar
Linus Torvalds committed
268
{
269 270
	__u32 hmask = ntohl(mask);
	if (!hmask)
Linus Torvalds's avatar
Linus Torvalds committed
271
		return 0;
272
	return 32 - ffz(~hmask);
Linus Torvalds's avatar
Linus Torvalds committed
273 274 275 276
}


#endif /* _LINUX_INETDEVICE_H */