include/net/addrconf.h

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

INCLUDED FROM

DEFINITIONS
