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TOMOYO Linux Cross Reference
Linux/include/linux/inetdevice.h

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  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         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 
 55 static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
 56 {
 57         index--;
 58         return in_dev->cnf.data[index];
 59 }
 60 
 61 static 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 
 69 static 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_RPFILTER(in_dev)         IN_DEV_MAXCONF((in_dev), RP_FILTER)
 97 #define IN_DEV_SRC_VMARK(in_dev)        IN_DEV_ORCONF((in_dev), SRC_VMARK)
 98 #define IN_DEV_SOURCE_ROUTE(in_dev)     IN_DEV_ANDCONF((in_dev), \
 99                                                        ACCEPT_SOURCE_ROUTE)
100 #define IN_DEV_ACCEPT_LOCAL(in_dev)     IN_DEV_ORCONF((in_dev), ACCEPT_LOCAL)
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)
105 #define IN_DEV_PROXY_ARP_PVLAN(in_dev)  IN_DEV_CONF_GET(in_dev, PROXY_ARP_PVLAN)
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)
115 #define IN_DEV_ROUTE_LOCALNET(in_dev)   IN_DEV_ORCONF(in_dev, ROUTE_LOCALNET)
116 #define IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)  \
117         IN_DEV_NET_ORCONF(in_dev, net, ROUTE_LOCALNET)
118 
119 #define IN_DEV_RX_REDIRECTS(in_dev) \
120         ((IN_DEV_FORWARD(in_dev) && \
121           IN_DEV_ANDCONF((in_dev), ACCEPT_REDIRECTS)) \
122          || (!IN_DEV_FORWARD(in_dev) && \
123           IN_DEV_ORCONF((in_dev), ACCEPT_REDIRECTS)))
124 
125 #define IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev) \
126         IN_DEV_CONF_GET((in_dev), IGNORE_ROUTES_WITH_LINKDOWN)
127 
128 #define IN_DEV_ARPFILTER(in_dev)        IN_DEV_ORCONF((in_dev), ARPFILTER)
129 #define IN_DEV_ARP_ACCEPT(in_dev)       IN_DEV_ORCONF((in_dev), ARP_ACCEPT)
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)
132 #define IN_DEV_ARP_NOTIFY(in_dev)       IN_DEV_MAXCONF((in_dev), ARP_NOTIFY)
133 
134 struct in_ifaddr {
135         struct hlist_node       hash;
136         struct in_ifaddr        *ifa_next;
137         struct in_device        *ifa_dev;
138         struct rcu_head         rcu_head;
139         __be32                  ifa_local;
140         __be32                  ifa_address;
141         __be32                  ifa_mask;
142         __be32                  ifa_broadcast;
143         unsigned char           ifa_scope;
144         unsigned char           ifa_prefixlen;
145         __u32                   ifa_flags;
146         char                    ifa_label[IFNAMSIZ];
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 */
153 };
154 
155 struct in_validator_info {
156         __be32                  ivi_addr;
157         struct in_device        *ivi_dev;
158         struct netlink_ext_ack  *extack;
159 };
160 
161 int register_inetaddr_notifier(struct notifier_block *nb);
162 int unregister_inetaddr_notifier(struct notifier_block *nb);
163 int register_inetaddr_validator_notifier(struct notifier_block *nb);
164 int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
165 
166 void inet_netconf_notify_devconf(struct net *net, int event, int type,
167                                  int ifindex, struct ipv4_devconf *devconf);
168 
169 struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
170 static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
171 {
172         return __ip_dev_find(net, addr, true);
173 }
174 
175 int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
176 int devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
177 void devinet_init(void);
178 struct in_device *inetdev_by_index(struct net *, int);
179 __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope);
180 __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
181                          __be32 local, int scope);
182 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
183                                     __be32 mask);
184 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
185 static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
186 {
187         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
188 }
189 
190 /*
191  *      Check if a mask is acceptable.
192  */
193  
194 static __inline__ bool bad_mask(__be32 mask, __be32 addr)
195 {
196         __u32 hmask;
197         if (addr & (mask = ~mask))
198                 return true;
199         hmask = ntohl(mask);
200         if (hmask & (hmask+1))
201                 return true;
202         return false;
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 
214 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
215 {
216         return rcu_dereference(dev->ip_ptr);
217 }
218 
219 static inline struct in_device *in_dev_get(const struct net_device *dev)
220 {
221         struct in_device *in_dev;
222 
223         rcu_read_lock();
224         in_dev = __in_dev_get_rcu(dev);
225         if (in_dev)
226                 refcount_inc(&in_dev->refcnt);
227         rcu_read_unlock();
228         return in_dev;
229 }
230 
231 static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
232 {
233         return rtnl_dereference(dev->ip_ptr);
234 }
235 
236 static 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 
243 void in_dev_finish_destroy(struct in_device *idev);
244 
245 static inline void in_dev_put(struct in_device *idev)
246 {
247         if (refcount_dec_and_test(&idev->refcnt))
248                 in_dev_finish_destroy(idev);
249 }
250 
251 #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
252 #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
253 
254 #endif /* __KERNEL__ */
255 
256 static __inline__ __be32 inet_make_mask(int logmask)
257 {
258         if (logmask)
259                 return htonl(~((1U<<(32-logmask))-1));
260         return 0;
261 }
262 
263 static __inline__ int inet_mask_len(__be32 mask)
264 {
265         __u32 hmask = ntohl(mask);
266         if (!hmask)
267                 return 0;
268         return 32 - ffz(~hmask);
269 }
270 
271 
272 #endif /* _LINUX_INETDEVICE_H */
273 

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