1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_INETDEVICE_H
3#define _LINUX_INETDEVICE_H
4
5#ifdef __KERNEL__
6
7#include <linux/bitmap.h>
8#include <linux/if.h>
9#include <linux/ip.h>
10#include <linux/netdevice.h>
11#include <linux/rcupdate.h>
12#include <linux/timer.h>
13#include <linux/sysctl.h>
14#include <linux/rtnetlink.h>
15#include <linux/refcount.h>
16
17struct ipv4_devconf {
18 void *sysctl;
19 int data[IPV4_DEVCONF_MAX];
20 DECLARE_BITMAP(state, IPV4_DEVCONF_MAX);
21};
22
23#define MC_HASH_SZ_LOG 9
24
25struct in_device {
26 struct net_device *dev;
27 refcount_t refcnt;
28 int dead;
29 struct in_ifaddr *ifa_list; /* IP ifaddr chain */
30
31 struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */
32 struct ip_mc_list __rcu * __rcu *mc_hash;
33
34 int mc_count; /* Number of installed mcasts */
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 long mr_qi; /* Query Interval */
41 unsigned long mr_qri; /* Query Response Interval */
42 unsigned char mr_qrv; /* Query Robustness Variable */
43 unsigned char mr_gq_running;
44 unsigned char mr_ifc_count;
45 struct timer_list mr_gq_timer; /* general query timer */
46 struct timer_list mr_ifc_timer; /* interface change timer */
47
48 struct neigh_parms *arp_parms;
49 struct ipv4_devconf cnf;
50 struct rcu_head rcu_head;
51};
52
53#define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1])
54#define IPV4_DEVCONF_ALL(net, attr) \
55 IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr)
56
57static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
58{
59 index--;
60 return in_dev->cnf.data[index];
61}
62
63static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
64 int val)
65{
66 index--;
67 set_bit(index, in_dev->cnf.state);
68 in_dev->cnf.data[index] = val;
69}
70
71static inline void ipv4_devconf_setall(struct in_device *in_dev)
72{
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#define IN_DEV_NET_ORCONF(in_dev, net, attr) \
86 (IPV4_DEVCONF_ALL(net, attr) || \
87 IN_DEV_CONF_GET((in_dev), attr))
88
89#define IN_DEV_ORCONF(in_dev, attr) \
90 IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr)
91
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#define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \
102 ACCEPT_SOURCE_ROUTE)
103#define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
104#define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY)
105
106#define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS)
107#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#define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA)
110#define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS)
111#define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \
112 SECURE_REDIRECTS)
113#define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG)
114#define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID)
115#define IN_DEV_PROMOTE_SECONDARIES(in_dev) \
116 IN_DEV_ORCONF((in_dev), \
117 PROMOTE_SECONDARIES)
118#define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
119#define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \
120 IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
121
122#define IN_DEV_RX_REDIRECTS(in_dev) \
123 ((IN_DEV_FORWARD(in_dev) && \
124 IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
125 || (!IN_DEV_FORWARD(in_dev) && \
126 IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
127
128#define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
129 IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
130
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#define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE)
134#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)
136
137struct in_ifaddr {
138 struct hlist_node hash;
139 struct in_ifaddr *ifa_next;
140 struct in_device *ifa_dev;
141 struct rcu_head rcu_head;
142 __be32 ifa_local;
143 __be32 ifa_address;
144 __be32 ifa_mask;
145 __u32 ifa_rt_priority;
146 __be32 ifa_broadcast;
147 unsigned char ifa_scope;
148 unsigned char ifa_prefixlen;
149 __u32 ifa_flags;
150 char ifa_label[IFNAMSIZ];
151
152 /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
153 __u32 ifa_valid_lft;
154 __u32 ifa_preferred_lft;
155 unsigned long ifa_cstamp; /* created timestamp */
156 unsigned long ifa_tstamp; /* updated timestamp */
157};
158
159struct in_validator_info {
160 __be32 ivi_addr;
161 struct in_device *ivi_dev;
162 struct netlink_ext_ack *extack;
163};
164
165int register_inetaddr_notifier(struct notifier_block *nb);
166int unregister_inetaddr_notifier(struct notifier_block *nb);
167int register_inetaddr_validator_notifier(struct notifier_block *nb);
168int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
169
170void inet_netconf_notify_devconf(struct net *net, int event, int type,
171 int ifindex, struct ipv4_devconf *devconf);
172
173struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
174static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
175{
176 return __ip_dev_find(net, addr, true);
177}
178
179int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
180int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
181void devinet_init(void);
182struct in_device *inetdev_by_index(struct net *, int);
183__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
184__be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
185 __be32 local, int scope);
186struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
187 __be32 mask);
188struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
189static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
190{
191 return !((addr^ifa->ifa_address)&ifa->ifa_mask);
192}
193
194/*
195 * Check if a mask is acceptable.
196 */
197
198static __inline__ bool bad_mask(__be32 mask, __be32 addr)
199{
200 __u32 hmask;
201 if (addr & (mask = ~mask))
202 return true;
203 hmask = ntohl(mask);
204 if (hmask & (hmask+1))
205 return true;
206 return false;
207}
208
209#define for_primary_ifa(in_dev) { struct in_ifaddr *ifa; \
210 for (ifa = (in_dev)->ifa_list; ifa && !(ifa->ifa_flags&IFA_F_SECONDARY); ifa = ifa->ifa_next)
211
212#define for_ifa(in_dev) { struct in_ifaddr *ifa; \
213 for (ifa = (in_dev)->ifa_list; ifa; ifa = ifa->ifa_next)
214
215
216#define endfor_ifa(in_dev) }
217
218static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
219{
220 return rcu_dereference(dev->ip_ptr);
221}
222
223static inline struct in_device *in_dev_get(const struct net_device *dev)
224{
225 struct in_device *in_dev;
226
227 rcu_read_lock();
228 in_dev = __in_dev_get_rcu(dev);
229 if (in_dev)
230 refcount_inc(&in_dev->refcnt);
231 rcu_read_unlock();
232 return in_dev;
233}
234
235static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
236{
237 return rtnl_dereference(dev->ip_ptr);
238}
239
240static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
241{
242 struct in_device *in_dev = __in_dev_get_rcu(dev);
243
244 return in_dev ? in_dev->arp_parms : NULL;
245}
246
247void in_dev_finish_destroy(struct in_device *idev);
248
249static inline void in_dev_put(struct in_device *idev)
250{
251 if (refcount_dec_and_test(&idev->refcnt))
252 in_dev_finish_destroy(idev);
253}
254
255#define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
256#define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
257
258#endif /* __KERNEL__ */
259
260static __inline__ __be32 inet_make_mask(int logmask)
261{
262 if (logmask)
263 return htonl(~((1U<<(32-logmask))-1));
264 return 0;
265}
266
267static __inline__ int inet_mask_len(__be32 mask)
268{
269 __u32 hmask = ntohl(mask);
270 if (!hmask)
271 return 0;
272 return 32 - ffz(~hmask);
273}
274
275
276#endif /* _LINUX_INETDEVICE_H */
277