LCOV - code coverage report
Current view: top level - include/linux - inetdevice.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 29 44 65.9 %
Date: 2021-04-22 12:43:58 Functions: 4 4 100.0 %

          Line data    Source code
       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        __rcu *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             : 
      57         308 : static inline int ipv4_devconf_get(struct in_device *in_dev, int index)
      58             : {
      59         308 :         index--;
      60         308 :         return in_dev->cnf.data[index];
      61             : }
      62             : 
      63           2 : static inline void ipv4_devconf_set(struct in_device *in_dev, int index,
      64             :                                     int val)
      65             : {
      66           2 :         index--;
      67           1 :         set_bit(index, in_dev->cnf.state);
      68           1 :         in_dev->cnf.data[index] = val;
      69           1 : }
      70             : 
      71           3 : static inline void ipv4_devconf_setall(struct in_device *in_dev)
      72             : {
      73           3 :         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_ORCONF((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_ORCONF((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             : 
     137             : struct in_ifaddr {
     138             :         struct hlist_node       hash;
     139             :         struct in_ifaddr        __rcu *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             : 
     159             : struct in_validator_info {
     160             :         __be32                  ivi_addr;
     161             :         struct in_device        *ivi_dev;
     162             :         struct netlink_ext_ack  *extack;
     163             : };
     164             : 
     165             : int register_inetaddr_notifier(struct notifier_block *nb);
     166             : int unregister_inetaddr_notifier(struct notifier_block *nb);
     167             : int register_inetaddr_validator_notifier(struct notifier_block *nb);
     168             : int unregister_inetaddr_validator_notifier(struct notifier_block *nb);
     169             : 
     170             : void inet_netconf_notify_devconf(struct net *net, int event, int type,
     171             :                                  int ifindex, struct ipv4_devconf *devconf);
     172             : 
     173             : struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
     174           0 : static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
     175             : {
     176           0 :         return __ip_dev_find(net, addr, true);
     177             : }
     178             : 
     179             : int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
     180             : int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *);
     181             : void devinet_init(void);
     182             : struct 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);
     186             : struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
     187             :                                     __be32 mask);
     188             : struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
     189           4 : static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
     190             : {
     191           4 :         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
     192             : }
     193             : 
     194             : /*
     195             :  *      Check if a mask is acceptable.
     196             :  */
     197             :  
     198           0 : static __inline__ bool bad_mask(__be32 mask, __be32 addr)
     199             : {
     200           0 :         __u32 hmask;
     201           0 :         if (addr & (mask = ~mask))
     202             :                 return true;
     203           0 :         hmask = ntohl(mask);
     204           0 :         if (hmask & (hmask+1))
     205             :                 return true;
     206             :         return false;
     207             : }
     208             : 
     209             : #define in_dev_for_each_ifa_rtnl(ifa, in_dev)                   \
     210             :         for (ifa = rtnl_dereference((in_dev)->ifa_list); ifa;        \
     211             :              ifa = rtnl_dereference(ifa->ifa_next))
     212             : 
     213             : #define in_dev_for_each_ifa_rcu(ifa, in_dev)                    \
     214             :         for (ifa = rcu_dereference((in_dev)->ifa_list); ifa; \
     215             :              ifa = rcu_dereference(ifa->ifa_next))
     216             : 
     217         191 : static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
     218             : {
     219         191 :         return rcu_dereference(dev->ip_ptr);
     220             : }
     221             : 
     222             : static inline struct in_device *in_dev_get(const struct net_device *dev)
     223             : {
     224             :         struct in_device *in_dev;
     225             : 
     226             :         rcu_read_lock();
     227             :         in_dev = __in_dev_get_rcu(dev);
     228             :         if (in_dev)
     229             :                 refcount_inc(&in_dev->refcnt);
     230             :         rcu_read_unlock();
     231             :         return in_dev;
     232             : }
     233             : 
     234          16 : static inline struct in_device *__in_dev_get_rtnl(const struct net_device *dev)
     235             : {
     236          16 :         return rtnl_dereference(dev->ip_ptr);
     237             : }
     238             : 
     239             : /* called with rcu_read_lock or rtnl held */
     240          67 : static inline bool ip_ignore_linkdown(const struct net_device *dev)
     241             : {
     242          67 :         struct in_device *in_dev;
     243          67 :         bool rc = false;
     244             : 
     245          67 :         in_dev = rcu_dereference_rtnl(dev->ip_ptr);
     246          67 :         if (in_dev &&
     247          67 :             IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
     248             :                 rc = true;
     249             : 
     250          67 :         return rc;
     251             : }
     252             : 
     253           0 : static inline struct neigh_parms *__in_dev_arp_parms_get_rcu(const struct net_device *dev)
     254             : {
     255           0 :         struct in_device *in_dev = __in_dev_get_rcu(dev);
     256             : 
     257           0 :         return in_dev ? in_dev->arp_parms : NULL;
     258             : }
     259             : 
     260             : void in_dev_finish_destroy(struct in_device *idev);
     261             : 
     262           1 : static inline void in_dev_put(struct in_device *idev)
     263             : {
     264           1 :         if (refcount_dec_and_test(&idev->refcnt))
     265           0 :                 in_dev_finish_destroy(idev);
     266           1 : }
     267             : 
     268             : #define __in_dev_put(idev)  refcount_dec(&(idev)->refcnt)
     269             : #define in_dev_hold(idev)   refcount_inc(&(idev)->refcnt)
     270             : 
     271             : #endif /* __KERNEL__ */
     272             : 
     273           3 : static __inline__ __be32 inet_make_mask(int logmask)
     274             : {
     275           2 :         if (logmask)
     276           3 :                 return htonl(~((1U<<(32-logmask))-1));
     277             :         return 0;
     278             : }
     279             : 
     280           0 : static __inline__ int inet_mask_len(__be32 mask)
     281             : {
     282           0 :         __u32 hmask = ntohl(mask);
     283           0 :         if (!hmask)
     284             :                 return 0;
     285           0 :         return 32 - ffz(~hmask);
     286             : }
     287             : 
     288             : 
     289             : #endif /* _LINUX_INETDEVICE_H */

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