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