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 | |
17 | struct 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 | |
25 | struct in_device { |
26 | struct net_device *dev; |
27 | netdevice_tracker dev_tracker; |
28 | |
29 | refcount_t refcnt; |
30 | int dead; |
31 | struct in_ifaddr __rcu *ifa_list;/* IP ifaddr chain */ |
32 | |
33 | struct ip_mc_list __rcu *mc_list; /* IP multicast filter chain */ |
34 | struct ip_mc_list __rcu * __rcu *mc_hash; |
35 | |
36 | int mc_count; /* Number of installed mcasts */ |
37 | spinlock_t mc_tomb_lock; |
38 | struct ip_mc_list *mc_tomb; |
39 | unsigned long mr_v1_seen; |
40 | unsigned long mr_v2_seen; |
41 | unsigned long mr_maxdelay; |
42 | unsigned long mr_qi; /* Query Interval */ |
43 | unsigned long mr_qri; /* Query Response Interval */ |
44 | unsigned char mr_qrv; /* Query Robustness Variable */ |
45 | unsigned char mr_gq_running; |
46 | u32 mr_ifc_count; |
47 | struct timer_list mr_gq_timer; /* general query timer */ |
48 | struct timer_list mr_ifc_timer; /* interface change timer */ |
49 | |
50 | struct neigh_parms *arp_parms; |
51 | struct ipv4_devconf cnf; |
52 | struct rcu_head rcu_head; |
53 | }; |
54 | |
55 | #define IPV4_DEVCONF(cnf, attr) ((cnf).data[IPV4_DEVCONF_ ## attr - 1]) |
56 | #define IPV4_DEVCONF_ALL(net, attr) \ |
57 | IPV4_DEVCONF((*(net)->ipv4.devconf_all), attr) |
58 | |
59 | static inline int ipv4_devconf_get(struct in_device *in_dev, int index) |
60 | { |
61 | index--; |
62 | return in_dev->cnf.data[index]; |
63 | } |
64 | |
65 | static inline void ipv4_devconf_set(struct in_device *in_dev, int index, |
66 | int val) |
67 | { |
68 | index--; |
69 | set_bit(nr: index, addr: in_dev->cnf.state); |
70 | in_dev->cnf.data[index] = val; |
71 | } |
72 | |
73 | static inline void ipv4_devconf_setall(struct in_device *in_dev) |
74 | { |
75 | bitmap_fill(dst: in_dev->cnf.state, IPV4_DEVCONF_MAX); |
76 | } |
77 | |
78 | #define IN_DEV_CONF_GET(in_dev, attr) \ |
79 | ipv4_devconf_get((in_dev), IPV4_DEVCONF_ ## attr) |
80 | #define IN_DEV_CONF_SET(in_dev, attr, val) \ |
81 | ipv4_devconf_set((in_dev), IPV4_DEVCONF_ ## attr, (val)) |
82 | |
83 | #define IN_DEV_ANDCONF(in_dev, attr) \ |
84 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr) && \ |
85 | IN_DEV_CONF_GET((in_dev), attr)) |
86 | |
87 | #define IN_DEV_NET_ORCONF(in_dev, net, attr) \ |
88 | (IPV4_DEVCONF_ALL(net, attr) || \ |
89 | IN_DEV_CONF_GET((in_dev), attr)) |
90 | |
91 | #define IN_DEV_ORCONF(in_dev, attr) \ |
92 | IN_DEV_NET_ORCONF(in_dev, dev_net(in_dev->dev), attr) |
93 | |
94 | #define IN_DEV_MAXCONF(in_dev, attr) \ |
95 | (max(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), attr), \ |
96 | IN_DEV_CONF_GET((in_dev), attr))) |
97 | |
98 | #define IN_DEV_FORWARD(in_dev) IN_DEV_CONF_GET((in_dev), FORWARDING) |
99 | #define IN_DEV_MFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), MC_FORWARDING) |
100 | #define IN_DEV_BFORWARD(in_dev) IN_DEV_ANDCONF((in_dev), BC_FORWARDING) |
101 | #define IN_DEV_RPFILTER(in_dev) IN_DEV_MAXCONF((in_dev), RP_FILTER) |
102 | #define IN_DEV_SRC_VMARK(in_dev) IN_DEV_ORCONF((in_dev), SRC_VMARK) |
103 | #define IN_DEV_SOURCE_ROUTE(in_dev) IN_DEV_ANDCONF((in_dev), \ |
104 | ACCEPT_SOURCE_ROUTE) |
105 | #define IN_DEV_ACCEPT_LOCAL(in_dev) IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL) |
106 | #define IN_DEV_BOOTP_RELAY(in_dev) IN_DEV_ANDCONF((in_dev), BOOTP_RELAY) |
107 | |
108 | #define IN_DEV_LOG_MARTIANS(in_dev) IN_DEV_ORCONF((in_dev), LOG_MARTIANS) |
109 | #define IN_DEV_PROXY_ARP(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP) |
110 | #define IN_DEV_PROXY_ARP_PVLAN(in_dev) IN_DEV_ORCONF((in_dev), PROXY_ARP_PVLAN) |
111 | #define IN_DEV_SHARED_MEDIA(in_dev) IN_DEV_ORCONF((in_dev), SHARED_MEDIA) |
112 | #define IN_DEV_TX_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), SEND_REDIRECTS) |
113 | #define IN_DEV_SEC_REDIRECTS(in_dev) IN_DEV_ORCONF((in_dev), \ |
114 | SECURE_REDIRECTS) |
115 | #define IN_DEV_IDTAG(in_dev) IN_DEV_CONF_GET(in_dev, TAG) |
116 | #define IN_DEV_MEDIUM_ID(in_dev) IN_DEV_CONF_GET(in_dev, MEDIUM_ID) |
117 | #define IN_DEV_PROMOTE_SECONDARIES(in_dev) \ |
118 | IN_DEV_ORCONF((in_dev), \ |
119 | PROMOTE_SECONDARIES) |
120 | #define IN_DEV_ROUTE_LOCALNET(in_dev) IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET) |
121 | #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net) \ |
122 | IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET) |
123 | |
124 | #define IN_DEV_RX_REDIRECTS(in_dev) \ |
125 | ((IN_DEV_FORWARD(in_dev) && \ |
126 | IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \ |
127 | || (!IN_DEV_FORWARD(in_dev) && \ |
128 | IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS))) |
129 | |
130 | #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \ |
131 | IN_DEV_ORCONF((in_dev), IGNORE_ROUTES_WITH_LINKDOWN) |
132 | |
133 | #define IN_DEV_ARPFILTER(in_dev) IN_DEV_ORCONF((in_dev), ARPFILTER) |
134 | #define IN_DEV_ARP_ACCEPT(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ACCEPT) |
135 | #define IN_DEV_ARP_ANNOUNCE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_ANNOUNCE) |
136 | #define IN_DEV_ARP_IGNORE(in_dev) IN_DEV_MAXCONF((in_dev), ARP_IGNORE) |
137 | #define IN_DEV_ARP_NOTIFY(in_dev) IN_DEV_MAXCONF((in_dev), ARP_NOTIFY) |
138 | #define IN_DEV_ARP_EVICT_NOCARRIER(in_dev) IN_DEV_ANDCONF((in_dev), \ |
139 | ARP_EVICT_NOCARRIER) |
140 | |
141 | struct in_ifaddr { |
142 | struct hlist_node hash; |
143 | struct in_ifaddr __rcu *ifa_next; |
144 | struct in_device *ifa_dev; |
145 | struct rcu_head rcu_head; |
146 | __be32 ifa_local; |
147 | __be32 ifa_address; |
148 | __be32 ifa_mask; |
149 | __u32 ifa_rt_priority; |
150 | __be32 ifa_broadcast; |
151 | unsigned char ifa_scope; |
152 | unsigned char ifa_prefixlen; |
153 | unsigned char ifa_proto; |
154 | __u32 ifa_flags; |
155 | char ifa_label[IFNAMSIZ]; |
156 | |
157 | /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */ |
158 | __u32 ifa_valid_lft; |
159 | __u32 ifa_preferred_lft; |
160 | unsigned long ifa_cstamp; /* created timestamp */ |
161 | unsigned long ifa_tstamp; /* updated timestamp */ |
162 | }; |
163 | |
164 | struct in_validator_info { |
165 | __be32 ivi_addr; |
166 | struct in_device *ivi_dev; |
167 | struct netlink_ext_ack *extack; |
168 | }; |
169 | |
170 | int register_inetaddr_notifier(struct notifier_block *nb); |
171 | int unregister_inetaddr_notifier(struct notifier_block *nb); |
172 | int register_inetaddr_validator_notifier(struct notifier_block *nb); |
173 | int unregister_inetaddr_validator_notifier(struct notifier_block *nb); |
174 | |
175 | void inet_netconf_notify_devconf(struct net *net, int event, int type, |
176 | int ifindex, struct ipv4_devconf *devconf); |
177 | |
178 | struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref); |
179 | static inline struct net_device *ip_dev_find(struct net *net, __be32 addr) |
180 | { |
181 | return __ip_dev_find(net, addr, devref: true); |
182 | } |
183 | |
184 | int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b); |
185 | int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *); |
186 | #ifdef CONFIG_INET |
187 | int inet_gifconf(struct net_device *dev, char __user *buf, int len, int size); |
188 | #else |
189 | static inline int inet_gifconf(struct net_device *dev, char __user *buf, |
190 | int len, int size) |
191 | { |
192 | return 0; |
193 | } |
194 | #endif |
195 | void devinet_init(void); |
196 | struct in_device *inetdev_by_index(struct net *, int); |
197 | __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope); |
198 | __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst, |
199 | __be32 local, int scope); |
200 | struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix, |
201 | __be32 mask); |
202 | struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr); |
203 | static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa) |
204 | { |
205 | return !((addr^ifa->ifa_address)&ifa->ifa_mask); |
206 | } |
207 | |
208 | /* |
209 | * Check if a mask is acceptable. |
210 | */ |
211 | |
212 | static __inline__ bool bad_mask(__be32 mask, __be32 addr) |
213 | { |
214 | __u32 hmask; |
215 | if (addr & (mask = ~mask)) |
216 | return true; |
217 | hmask = ntohl(mask); |
218 | if (hmask & (hmask+1)) |
219 | return true; |
220 | return false; |
221 | } |
222 | |
223 | #define in_dev_for_each_ifa_rtnl(ifa, in_dev) \ |
224 | for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa; \ |
225 | ifa = rtnl_dereference(ifa->ifa_next)) |
226 | |
227 | #define in_dev_for_each_ifa_rcu(ifa, in_dev) \ |
228 | for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \ |
229 | ifa = rcu_dereference(ifa->ifa_next)) |
230 | |
231 | static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev) |
232 | { |
233 | return rcu_dereference(dev->ip_ptr); |
234 | } |
235 | |
236 | static inline struct in_device *in_dev_get(const struct net_device *dev) |
237 | { |
238 | struct in_device *in_dev; |
239 | |
240 | rcu_read_lock(); |
241 | in_dev = __in_dev_get_rcu(dev); |
242 | if (in_dev) |
243 | refcount_inc(r: &in_dev->refcnt); |
244 | rcu_read_unlock(); |
245 | return in_dev; |
246 | } |
247 | |
248 | static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev) |
249 | { |
250 | return rtnl_dereference(dev->ip_ptr); |
251 | } |
252 | |
253 | /* called with rcu_read_lock or rtnl held */ |
254 | static inline bool ip_ignore_linkdown(const struct net_device *dev) |
255 | { |
256 | struct in_device *in_dev; |
257 | bool rc = false; |
258 | |
259 | in_dev = rcu_dereference_rtnl(dev->ip_ptr); |
260 | if (in_dev && |
261 | IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev)) |
262 | rc = true; |
263 | |
264 | return rc; |
265 | } |
266 | |
267 | static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev) |
268 | { |
269 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
270 | |
271 | return in_dev ? in_dev->arp_parms : NULL; |
272 | } |
273 | |
274 | void in_dev_finish_destroy(struct in_device *idev); |
275 | |
276 | static inline void in_dev_put(struct in_device *idev) |
277 | { |
278 | if (refcount_dec_and_test(r: &idev->refcnt)) |
279 | in_dev_finish_destroy(idev); |
280 | } |
281 | |
282 | #define __in_dev_put(idev) refcount_dec(&(idev)->refcnt) |
283 | #define in_dev_hold(idev) refcount_inc(&(idev)->refcnt) |
284 | |
285 | #endif /* __KERNEL__ */ |
286 | |
287 | static __inline__ __be32 inet_make_mask(int logmask) |
288 | { |
289 | if (logmask) |
290 | return htonl(~((1U<<(32-logmask))-1)); |
291 | return 0; |
292 | } |
293 | |
294 | static __inline__ int inet_mask_len(__be32 mask) |
295 | { |
296 | __u32 hmask = ntohl(mask); |
297 | if (!hmask) |
298 | return 0; |
299 | return 32 - ffz(~hmask); |
300 | } |
301 | |
302 | |
303 | #endif /* _LINUX_INETDEVICE_H */ |
304 | |