include/linux/inetdevice.h

   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 */