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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
1da177e4
LT
2#ifndef _LINUX_INETDEVICE_H
3#define _LINUX_INETDEVICE_H
4
5#ifdef __KERNEL__
6
31be3085 7#include <linux/bitmap.h>
1da177e4 8#include <linux/if.h>
4a5a8aa6 9#include <linux/ip.h>
1da177e4
LT
10#include <linux/netdevice.h>
11#include <linux/rcupdate.h>
12#include <linux/timer.h>
8bfe6d68 13#include <linux/sysctl.h>
95ae6b22 14#include <linux/rtnetlink.h>
7658b36f 15#include <linux/refcount.h>
1da177e4 16
d94d9fee 17struct ipv4_devconf {
1da177e4 18 void *sysctl;
ca7479eb
TG
19 int data[IPV4_DEVCONF_MAX];
20 DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
1da177e4
LT
21};
22
e9897071
ED
23#define MC_HASH_SZ_LOG 9
24
d94d9fee 25struct in_device {
1da177e4 26 struct net_device *dev;
7658b36f 27 refcount_t refcnt;
1da177e4
LT
28 int dead;
29 struct in_ifaddr *ifa_list; /* IP ifaddr chain */
e9897071 30
1d7138de 31 struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
e9897071
ED
32 struct ip_mc_list __rcu * __rcu *mc_hash;
33
1d7138de 34 int mc_count; /* Number of installed mcasts */
1da177e4
LT
35 spinlock_t mc_tomb_lock;
36 struct ip_mc_list *mc_tomb;
37 unsigned long mr_v1_seen;
38 unsigned long mr_v2_seen;
39 unsigned long mr_maxdelay;
40 unsigned char mr_qrv;
41 unsigned char mr_gq_running;
42 unsigned char mr_ifc_count;
43 struct timer_list mr_gq_timer; /* general query timer */
44 struct timer_list mr_ifc_timer; /* interface change timer */
45
46 struct neigh_parms *arp_parms;
47 struct ipv4_devconf cnf;
48 struct rcu_head rcu_head;
49};
50
02291680 51#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
586f1211
PE
52#define IPV4_DEVCONF_ALL(net, attr) \
53 IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
42f811b8
HX
54
55static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
56{
57 index--;
58 return in_dev->cnf.data[index];
59}
60
61static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
62 int val)
63{
64 index--;
31be3085 65 set_bit(index, in_dev->cnf.state);
42f811b8
HX
66 in_dev->cnf.data[index] = val;
67}
68
71e27da9
HX
69static inline void ipv4_devconf_setall(struct in_device *in_dev)
70{
ca7479eb 71 bitmap_fill(in_dev->cnf.state, IPV4_DEVCONF_MAX);
71e27da9
HX
72}
73
42f811b8 74#define IN_DEV_CONF_GET(in_dev, attr) \
02291680 75 ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr)
42f811b8 76#define IN_DEV_CONF_SET(in_dev, attr, val) \
02291680 77 ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val))
42f811b8
HX
78
79#define IN_DEV_ANDCONF(in_dev, attr) \
c346dca1 80 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \
586f1211 81 IN_DEV_CONF_GET((in_dev), attr))
9eb43e76
ED
82
83#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
84 (IPV4_DEVCONF_ALL(net, attr) || \
586f1211 85 IN_DEV_CONF_GET((in_dev), attr))
9eb43e76
ED
86
87#define IN_DEV_ORCONF(in_dev, attr) \
88 IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
89
42f811b8 90#define IN_DEV_MAXCONF(in_dev, attr) \
c346dca1 91 (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \
586f1211 92 IN_DEV_CONF_GET((in_dev), attr)))
42f811b8
HX
93
94#define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING)
01ecfe9b 95#define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING)
27fed417 96#define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER)
28f6aeea 97#define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK)
42f811b8
HX
98#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
99 ACCEPT_SOURCE_ROUTE)
8153a10c 100#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
42f811b8
HX
101#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
102
103#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
104#define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP)
65324144 105#define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
42f811b8
HX
106#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
107#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
108#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
109 SECURE_REDIRECTS)
110#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
111#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
112#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
113 IN_DEV_ORCONF((in_dev), \
114 PROMOTE_SECONDARIES)
d0daebc3 115#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
9eb43e76
ED
116#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
117 IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
1da177e4
LT
118
119#define IN_DEV_RX_REDIRECTS(in_dev) \
120 ((IN_DEV_FORWARD(in_dev) && \
42f811b8 121 IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
1da177e4 122 || (!IN_DEV_FORWARD(in_dev) && \
42f811b8 123 IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
1da177e4 124
0eeb075f
AG
125#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
126 IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
127
42f811b8 128#define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER)
124d37e9 129#define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
42f811b8
HX
130#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
131#define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE)
eefef1cf 132#define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
1da177e4 133
d94d9fee 134struct in_ifaddr {
fd23c3b3 135 struct hlist_node hash;
1da177e4
LT
136 struct in_ifaddr *ifa_next;
137 struct in_device *ifa_dev;
138 struct rcu_head rcu_head;
a144ea4b
AV
139 __be32 ifa_local;
140 __be32 ifa_address;
141 __be32 ifa_mask;
142 __be32 ifa_broadcast;
1da177e4 143 unsigned char ifa_scope;
1da177e4 144 unsigned char ifa_prefixlen;
ad6c8135 145 __u32 ifa_flags;
1da177e4 146 char ifa_label[IFNAMSIZ];
5c766d64
JP
147
148 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
149 __u32 ifa_valid_lft;
150 __u32 ifa_preferred_lft;
151 unsigned long ifa_cstamp; /* created timestamp */
152 unsigned long ifa_tstamp; /* updated timestamp */
1da177e4
LT
153};
154
3ad7d246
KJ
155struct in_validator_info {
156 __be32 ivi_addr;
157 struct in_device *ivi_dev;
de95e047 158 struct netlink_ext_ack *extack;
3ad7d246
KJ
159};
160
f629d208
JP
161int register_inetaddr_notifier(struct notifier_block *nb);
162int unregister_inetaddr_notifier(struct notifier_block *nb);
3ad7d246
KJ
163int register_inetaddr_validator_notifier(struct notifier_block *nb);
164int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
1da177e4 165
3b022865
DA
166void inet_netconf_notify_devconf(struct net *net, int event, int type,
167 int ifindex, struct ipv4_devconf *devconf);
d67b8c61 168
f629d208 169struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
82efee14
ED
170static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
171{
172 return __ip_dev_find(net, addr, true);
173}
174
f629d208
JP
175int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
176int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
177void devinet_init(void);
178struct in_device *inetdev_by_index(struct net *, int);
179__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
b601fa19
ND
180__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
181 __be32 local, int scope);
f629d208
JP
182struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
183 __be32 mask);
6e617de8 184struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
c3225164 185static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
1da177e4
LT
186{
187 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
188}
189
190/*
191 * Check if a mask is acceptable.
192 */
193
f06cc7b2 194static __inline__ bool bad_mask(__be32 mask, __be32 addr)
1da177e4 195{
714e85be 196 __u32 hmask;
1da177e4 197 if (addr & (mask = ~mask))
f06cc7b2 198 return true;
714e85be
AV
199 hmask = ntohl(mask);
200 if (hmask & (hmask+1))
f06cc7b2
YB
201 return true;
202 return false;
1da177e4
LT
203}
204
205#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
206 for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
207
208#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
209 for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
210
211
212#define endfor_ifa(in_dev) }
213
e5ed6399
HX
214static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
215{
95ae6b22 216 return rcu_dereference(dev->ip_ptr);
e5ed6399
HX
217}
218
95ae6b22 219static inline struct in_device *in_dev_get(const struct net_device *dev)
1da177e4
LT
220{
221 struct in_device *in_dev;
222
223 rcu_read_lock();
e5ed6399 224 in_dev = __in_dev_get_rcu(dev);
1da177e4 225 if (in_dev)
7658b36f 226 refcount_inc(&in_dev->refcnt);
1da177e4
LT
227 rcu_read_unlock();
228 return in_dev;
229}
230
95ae6b22 231static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
1da177e4 232{
06a9701f 233 return rtnl_dereference(dev->ip_ptr);
1da177e4
LT
234}
235
1d4c8c29
JP
236static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
237{
238 struct in_device *in_dev = __in_dev_get_rcu(dev);
239
240 return in_dev ? in_dev->arp_parms : NULL;
241}
242
f629d208 243void in_dev_finish_destroy(struct in_device *idev);
1da177e4
LT
244
245static inline void in_dev_put(struct in_device *idev)
246{
7658b36f 247 if (refcount_dec_and_test(&idev->refcnt))
1da177e4
LT
248 in_dev_finish_destroy(idev);
249}
250
7658b36f
RE
251#define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
252#define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
1da177e4
LT
253
254#endif /* __KERNEL__ */
255
60cad5da 256static __inline__ __be32 inet_make_mask(int logmask)
1da177e4
LT
257{
258 if (logmask)
84bc8868 259 return htonl(~((1U<<(32-logmask))-1));
1da177e4
LT
260 return 0;
261}
262
714e85be 263static __inline__ int inet_mask_len(__be32 mask)
1da177e4 264{
714e85be
AV
265 __u32 hmask = ntohl(mask);
266 if (!hmask)
1da177e4 267 return 0;
714e85be 268 return 32 - ffz(~hmask);
1da177e4
LT
269}
270
271
272#endif /* _LINUX_INETDEVICE_H */