LCOV - code coverage report
Current view: top level - include/net - addrconf.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 6 16 37.5 %
Date: 2021-04-22 12:43:58 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _ADDRCONF_H
       3             : #define _ADDRCONF_H
       4             : 
       5             : #define MAX_RTR_SOLICITATIONS           -1              /* unlimited */
       6             : #define RTR_SOLICITATION_INTERVAL       (4*HZ)
       7             : #define RTR_SOLICITATION_MAX_INTERVAL   (3600*HZ)       /* 1 hour */
       8             : 
       9             : #define TEMP_VALID_LIFETIME             (7*86400)
      10             : #define TEMP_PREFERRED_LIFETIME         (86400)
      11             : #define REGEN_MAX_RETRY                 (3)
      12             : #define MAX_DESYNC_FACTOR               (600)
      13             : 
      14             : #define ADDR_CHECK_FREQUENCY            (120*HZ)
      15             : 
      16             : #define IPV6_MAX_ADDRESSES              16
      17             : 
      18             : #define ADDRCONF_TIMER_FUZZ_MINUS       (HZ > 50 ? HZ / 50 : 1)
      19             : #define ADDRCONF_TIMER_FUZZ             (HZ / 4)
      20             : #define ADDRCONF_TIMER_FUZZ_MAX         (HZ)
      21             : 
      22             : #define ADDRCONF_NOTIFY_PRIORITY        0
      23             : 
      24             : #include <linux/in.h>
      25             : #include <linux/in6.h>
      26             : 
      27             : struct prefix_info {
      28             :         __u8                    type;
      29             :         __u8                    length;
      30             :         __u8                    prefix_len;
      31             : 
      32             : #if defined(__BIG_ENDIAN_BITFIELD)
      33             :         __u8                    onlink : 1,
      34             :                                 autoconf : 1,
      35             :                                 reserved : 6;
      36             : #elif defined(__LITTLE_ENDIAN_BITFIELD)
      37             :         __u8                    reserved : 6,
      38             :                                 autoconf : 1,
      39             :                                 onlink : 1;
      40             : #else
      41             : #error "Please fix <asm/byteorder.h>"
      42             : #endif
      43             :         __be32                  valid;
      44             :         __be32                  prefered;
      45             :         __be32                  reserved2;
      46             : 
      47             :         struct in6_addr         prefix;
      48             : };
      49             : 
      50             : #include <linux/ipv6.h>
      51             : #include <linux/netdevice.h>
      52             : #include <net/if_inet6.h>
      53             : #include <net/ipv6.h>
      54             : 
      55             : struct in6_validator_info {
      56             :         struct in6_addr         i6vi_addr;
      57             :         struct inet6_dev        *i6vi_dev;
      58             :         struct netlink_ext_ack  *extack;
      59             : };
      60             : 
      61             : struct ifa6_config {
      62             :         const struct in6_addr   *pfx;
      63             :         unsigned int            plen;
      64             : 
      65             :         const struct in6_addr   *peer_pfx;
      66             : 
      67             :         u32                     rt_priority;
      68             :         u32                     ifa_flags;
      69             :         u32                     preferred_lft;
      70             :         u32                     valid_lft;
      71             :         u16                     scope;
      72             : };
      73             : 
      74             : int addrconf_init(void);
      75             : void addrconf_cleanup(void);
      76             : 
      77             : int addrconf_add_ifaddr(struct net *net, void __user *arg);
      78             : int addrconf_del_ifaddr(struct net *net, void __user *arg);
      79             : int addrconf_set_dstaddr(struct net *net, void __user *arg);
      80             : 
      81             : int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
      82             :                   const struct net_device *dev, int strict);
      83             : int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
      84             :                             const struct net_device *dev, bool skip_dev_check,
      85             :                             int strict, u32 banned_flags);
      86             : 
      87             : #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
      88             : int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
      89             : #endif
      90             : 
      91             : int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
      92             :                           unsigned char nsegs);
      93             : 
      94             : bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
      95             :                                    const unsigned int prefix_len,
      96             :                                    struct net_device *dev);
      97             : 
      98             : int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
      99             : 
     100             : struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
     101             :                                  struct net_device *dev);
     102             : 
     103             : struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
     104             :                                      const struct in6_addr *addr,
     105             :                                      struct net_device *dev, int strict);
     106             : 
     107             : int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
     108             :                        const struct in6_addr *daddr, unsigned int srcprefs,
     109             :                        struct in6_addr *saddr);
     110             : int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
     111             :                       u32 banned_flags);
     112             : int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
     113             :                     u32 banned_flags);
     114             : bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
     115             :                           bool match_wildcard);
     116             : bool inet_rcv_saddr_any(const struct sock *sk);
     117             : void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
     118             : void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
     119             : 
     120             : void addrconf_add_linklocal(struct inet6_dev *idev,
     121             :                             const struct in6_addr *addr, u32 flags);
     122             : 
     123             : int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
     124             :                                  const struct prefix_info *pinfo,
     125             :                                  struct inet6_dev *in6_dev,
     126             :                                  const struct in6_addr *addr, int addr_type,
     127             :                                  u32 addr_flags, bool sllao, bool tokenized,
     128             :                                  __u32 valid_lft, u32 prefered_lft);
     129             : 
     130             : static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
     131             : {
     132             :         memcpy(eui, addr, 3);
     133             :         eui[3] = 0xFF;
     134             :         eui[4] = 0xFE;
     135             :         memcpy(eui + 5, addr + 3, 3);
     136             : }
     137             : 
     138             : static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
     139             : {
     140             :         addrconf_addr_eui48_base(eui, addr);
     141             :         eui[0] ^= 2;
     142             : }
     143             : 
     144             : static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
     145             : {
     146             :         if (dev->addr_len != ETH_ALEN)
     147             :                 return -1;
     148             : 
     149             :         /*
     150             :          * The zSeries OSA network cards can be shared among various
     151             :          * OS instances, but the OSA cards have only one MAC address.
     152             :          * This leads to duplicate address conflicts in conjunction
     153             :          * with IPv6 if more than one instance uses the same card.
     154             :          *
     155             :          * The driver for these cards can deliver a unique 16-bit
     156             :          * identifier for each instance sharing the same card.  It is
     157             :          * placed instead of 0xFFFE in the interface identifier.  The
     158             :          * "u" bit of the interface identifier is not inverted in this
     159             :          * case.  Hence the resulting interface identifier has local
     160             :          * scope according to RFC2373.
     161             :          */
     162             : 
     163             :         addrconf_addr_eui48_base(eui, dev->dev_addr);
     164             : 
     165             :         if (dev->dev_id) {
     166             :                 eui[3] = (dev->dev_id >> 8) & 0xFF;
     167             :                 eui[4] = dev->dev_id & 0xFF;
     168             :         } else {
     169             :                 eui[0] ^= 2;
     170             :         }
     171             : 
     172             :         return 0;
     173             : }
     174             : 
     175           6 : static inline unsigned long addrconf_timeout_fixup(u32 timeout,
     176             :                                                    unsigned int unit)
     177             : {
     178           6 :         if (timeout == 0xffffffff)
     179             :                 return ~0UL;
     180             : 
     181             :         /*
     182             :          * Avoid arithmetic overflow.
     183             :          * Assuming unit is constant and non-zero, this "if" statement
     184             :          * will go away on 64bit archs.
     185             :          */
     186           2 :         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
     187             :                 return LONG_MAX / unit;
     188             : 
     189           2 :         return timeout;
     190             : }
     191             : 
     192           6 : static inline int addrconf_finite_timeout(unsigned long timeout)
     193             : {
     194           6 :         return ~timeout;
     195             : }
     196             : 
     197             : /*
     198             :  *      IPv6 Address Label subsystem (addrlabel.c)
     199             :  */
     200             : int ipv6_addr_label_init(void);
     201             : void ipv6_addr_label_cleanup(void);
     202             : int ipv6_addr_label_rtnl_register(void);
     203             : u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
     204             :                     int type, int ifindex);
     205             : 
     206             : /*
     207             :  *      multicast prototypes (mcast.c)
     208             :  */
     209             : static inline bool ipv6_mc_may_pull(struct sk_buff *skb,
     210             :                                     unsigned int len)
     211             : {
     212             :         if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len)
     213             :                 return false;
     214             : 
     215             :         return pskb_may_pull(skb, len);
     216             : }
     217             : 
     218             : int ipv6_sock_mc_join(struct sock *sk, int ifindex,
     219             :                       const struct in6_addr *addr);
     220             : int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
     221             :                       const struct in6_addr *addr);
     222             : void __ipv6_sock_mc_close(struct sock *sk);
     223             : void ipv6_sock_mc_close(struct sock *sk);
     224             : bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
     225             :                     const struct in6_addr *src_addr);
     226             : 
     227             : int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
     228             : int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
     229             : int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
     230             : void ipv6_mc_up(struct inet6_dev *idev);
     231             : void ipv6_mc_down(struct inet6_dev *idev);
     232             : void ipv6_mc_unmap(struct inet6_dev *idev);
     233             : void ipv6_mc_remap(struct inet6_dev *idev);
     234             : void ipv6_mc_init_dev(struct inet6_dev *idev);
     235             : void ipv6_mc_destroy_dev(struct inet6_dev *idev);
     236             : int ipv6_mc_check_icmpv6(struct sk_buff *skb);
     237             : int ipv6_mc_check_mld(struct sk_buff *skb);
     238             : void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp);
     239             : 
     240             : bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
     241             :                          const struct in6_addr *src_addr);
     242             : 
     243             : void ipv6_mc_dad_complete(struct inet6_dev *idev);
     244             : 
     245             : /*
     246             :  * identify MLD packets for MLD filter exceptions
     247             :  */
     248             : static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
     249             : {
     250             :         struct icmp6hdr *hdr;
     251             : 
     252             :         if (nexthdr != IPPROTO_ICMPV6 ||
     253             :             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
     254             :                 return false;
     255             : 
     256             :         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
     257             : 
     258             :         switch (hdr->icmp6_type) {
     259             :         case ICMPV6_MGM_QUERY:
     260             :         case ICMPV6_MGM_REPORT:
     261             :         case ICMPV6_MGM_REDUCTION:
     262             :         case ICMPV6_MLD2_REPORT:
     263             :                 return true;
     264             :         default:
     265             :                 break;
     266             :         }
     267             :         return false;
     268             : }
     269             : 
     270             : void addrconf_prefix_rcv(struct net_device *dev,
     271             :                          u8 *opt, int len, bool sllao);
     272             : 
     273             : /*
     274             :  *      anycast prototypes (anycast.c)
     275             :  */
     276             : int ipv6_sock_ac_join(struct sock *sk, int ifindex,
     277             :                       const struct in6_addr *addr);
     278             : int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
     279             :                       const struct in6_addr *addr);
     280             : void __ipv6_sock_ac_close(struct sock *sk);
     281             : void ipv6_sock_ac_close(struct sock *sk);
     282             : 
     283             : int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
     284             : int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
     285             : void ipv6_ac_destroy_dev(struct inet6_dev *idev);
     286             : bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
     287             :                          const struct in6_addr *addr);
     288             : bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
     289             :                              const struct in6_addr *addr);
     290             : int ipv6_anycast_init(void);
     291             : void ipv6_anycast_cleanup(void);
     292             : 
     293             : /* Device notifier */
     294             : int register_inet6addr_notifier(struct notifier_block *nb);
     295             : int unregister_inet6addr_notifier(struct notifier_block *nb);
     296             : int inet6addr_notifier_call_chain(unsigned long val, void *v);
     297             : 
     298             : int register_inet6addr_validator_notifier(struct notifier_block *nb);
     299             : int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
     300             : int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
     301             : 
     302             : void inet6_netconf_notify_devconf(struct net *net, int event, int type,
     303             :                                   int ifindex, struct ipv6_devconf *devconf);
     304             : 
     305             : /**
     306             :  * __in6_dev_get - get inet6_dev pointer from netdevice
     307             :  * @dev: network device
     308             :  *
     309             :  * Caller must hold rcu_read_lock or RTNL, because this function
     310             :  * does not take a reference on the inet6_dev.
     311             :  */
     312           0 : static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
     313             : {
     314           0 :         return rcu_dereference_rtnl(dev->ip6_ptr);
     315             : }
     316             : 
     317             : /**
     318             :  * __in6_dev_stats_get - get inet6_dev pointer for stats
     319             :  * @dev: network device
     320             :  * @skb: skb for original incoming interface if neeeded
     321             :  *
     322             :  * Caller must hold rcu_read_lock or RTNL, because this function
     323             :  * does not take a reference on the inet6_dev.
     324             :  */
     325             : static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev,
     326             :                                                     const struct sk_buff *skb)
     327             : {
     328             :         if (netif_is_l3_master(dev))
     329             :                 dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb));
     330             :         return __in6_dev_get(dev);
     331             : }
     332             : 
     333             : /**
     334             :  * __in6_dev_get_safely - get inet6_dev pointer from netdevice
     335             :  * @dev: network device
     336             :  *
     337             :  * This is a safer version of __in6_dev_get
     338             :  */
     339             : static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev)
     340             : {
     341             :         if (likely(dev))
     342             :                 return rcu_dereference_rtnl(dev->ip6_ptr);
     343             :         else
     344             :                 return NULL;
     345             : }
     346             : 
     347             : /**
     348             :  * in6_dev_get - get inet6_dev pointer from netdevice
     349             :  * @dev: network device
     350             :  *
     351             :  * This version can be used in any context, and takes a reference
     352             :  * on the inet6_dev. Callers must use in6_dev_put() later to
     353             :  * release this reference.
     354             :  */
     355             : static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
     356             : {
     357             :         struct inet6_dev *idev;
     358             : 
     359             :         rcu_read_lock();
     360             :         idev = rcu_dereference(dev->ip6_ptr);
     361             :         if (idev)
     362             :                 refcount_inc(&idev->refcnt);
     363             :         rcu_read_unlock();
     364             :         return idev;
     365             : }
     366             : 
     367           0 : static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
     368             : {
     369           0 :         struct inet6_dev *idev = __in6_dev_get(dev);
     370             : 
     371           0 :         return idev ? idev->nd_parms : NULL;
     372             : }
     373             : 
     374             : void in6_dev_finish_destroy(struct inet6_dev *idev);
     375             : 
     376             : static inline void in6_dev_put(struct inet6_dev *idev)
     377             : {
     378             :         if (refcount_dec_and_test(&idev->refcnt))
     379             :                 in6_dev_finish_destroy(idev);
     380             : }
     381             : 
     382             : static inline void in6_dev_put_clear(struct inet6_dev **pidev)
     383             : {
     384             :         struct inet6_dev *idev = *pidev;
     385             : 
     386             :         if (idev) {
     387             :                 in6_dev_put(idev);
     388             :                 *pidev = NULL;
     389             :         }
     390             : }
     391             : 
     392             : static inline void __in6_dev_put(struct inet6_dev *idev)
     393             : {
     394             :         refcount_dec(&idev->refcnt);
     395             : }
     396             : 
     397             : static inline void in6_dev_hold(struct inet6_dev *idev)
     398             : {
     399             :         refcount_inc(&idev->refcnt);
     400             : }
     401             : 
     402             : /* called with rcu_read_lock held */
     403           0 : static inline bool ip6_ignore_linkdown(const struct net_device *dev)
     404             : {
     405           0 :         const struct inet6_dev *idev = __in6_dev_get(dev);
     406             : 
     407           0 :         return !!idev->cnf.ignore_routes_with_linkdown;
     408             : }
     409             : 
     410             : void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
     411             : 
     412             : static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
     413             : {
     414             :         if (refcount_dec_and_test(&ifp->refcnt))
     415             :                 inet6_ifa_finish_destroy(ifp);
     416             : }
     417             : 
     418             : static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
     419             : {
     420             :         refcount_dec(&ifp->refcnt);
     421             : }
     422             : 
     423             : static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
     424             : {
     425             :         refcount_inc(&ifp->refcnt);
     426             : }
     427             : 
     428             : 
     429             : /*
     430             :  *      compute link-local solicited-node multicast address
     431             :  */
     432             : 
     433             : static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
     434             :                                              struct in6_addr *solicited)
     435             : {
     436             :         ipv6_addr_set(solicited,
     437             :                       htonl(0xFF020000), 0,
     438             :                       htonl(0x1),
     439             :                       htonl(0xFF000000) | addr->s6_addr32[3]);
     440             : }
     441             : 
     442             : static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
     443             : {
     444             : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
     445             :         __be64 *p = (__force __be64 *)addr;
     446             :         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
     447             : #else
     448             :         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
     449             :                 addr->s6_addr32[1] | addr->s6_addr32[2] |
     450             :                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
     451             : #endif
     452             : }
     453             : 
     454             : static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
     455             : {
     456             : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
     457             :         __be64 *p = (__force __be64 *)addr;
     458             :         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
     459             : #else
     460             :         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
     461             :                 addr->s6_addr32[1] | addr->s6_addr32[2] |
     462             :                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
     463             : #endif
     464             : }
     465             : 
     466           0 : static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
     467             : {
     468           0 :         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
     469             : }
     470             : 
     471             : static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
     472             : {
     473             : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
     474             :         __be64 *p = (__force __be64 *)addr;
     475             :         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
     476             :                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
     477             :                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
     478             : #else
     479             :         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
     480             :                 addr->s6_addr32[1] |
     481             :                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
     482             :                 (addr->s6_addr[12] ^ 0xff)) == 0;
     483             : #endif
     484             : }
     485             : 
     486             : static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr)
     487             : {
     488             : #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
     489             :         __be64 *p = (__force __be64 *)addr;
     490             : 
     491             :         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
     492             :                 (p[1] ^ cpu_to_be64(0x6a))) == 0UL;
     493             : #else
     494             :         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
     495             :                 addr->s6_addr32[1] | addr->s6_addr32[2] |
     496             :                 (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0;
     497             : #endif
     498             : }
     499             : 
     500             : #ifdef CONFIG_PROC_FS
     501             : int if6_proc_init(void);
     502             : void if6_proc_exit(void);
     503             : #endif
     504             : 
     505             : #endif

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