include/net/addrconf.h

   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/netdevice.h>
  53 #include <net/if_inet6.h>
  54 #include <net/ipv6.h>
  55
  56 struct in6_validator_info {
  57         struct in6_addr         i6vi_addr;
  58         struct inet6_dev        *i6vi_dev;
  59 };
  60
  61 #define IN6_ADDR_HSIZE_SHIFT    4
  62 #define IN6_ADDR_HSIZE          (1 << IN6_ADDR_HSIZE_SHIFT)
  63
  64 int addrconf_init(void);
  65 void addrconf_cleanup(void);
  66
  67 int addrconf_add_ifaddr(struct net *net, void __user *arg);
  68 int addrconf_del_ifaddr(struct net *net, void __user *arg);
  69 int addrconf_set_dstaddr(struct net *net, void __user *arg);
  70
  71 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  72                   const struct net_device *dev, int strict);
  73 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
  74                             const struct net_device *dev, int strict,
  75                             u32 banned_flags);
  76
  77 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
  78 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr);
  79 #endif
  80
  81 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
  82                                    const unsigned int prefix_len,
  83                                    struct net_device *dev);
  84
  85 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
  86
  87 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
  88                                      const struct in6_addr *addr,
  89                                      struct net_device *dev, int strict);
  90
  91 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev,
  92                        const struct in6_addr *daddr, unsigned int srcprefs,
  93                        struct in6_addr *saddr);
  94 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
  95                       u32 banned_flags);
  96 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
  97                     u32 banned_flags);
  98 int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
  99                          bool match_wildcard);
 100 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr);
 101 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr);
 102
 103 void addrconf_add_linklocal(struct inet6_dev *idev,
 104                             const struct in6_addr *addr, u32 flags);
 105
 106 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
 107                                  const struct prefix_info *pinfo,
 108                                  struct inet6_dev *in6_dev,
 109                                  const struct in6_addr *addr, int addr_type,
 110                                  u32 addr_flags, bool sllao, bool tokenized,
 111                                  __u32 valid_lft, u32 prefered_lft);
 112
 113 static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr)
 114 {
 115         memcpy(eui, addr, 3);
 116         eui[3] = 0xFF;
 117         eui[4] = 0xFE;
 118         memcpy(eui + 5, addr + 3, 3);
 119 }
 120
 121 static inline void addrconf_addr_eui48(u8 *eui, const char *const addr)
 122 {
 123         addrconf_addr_eui48_base(eui, addr);
 124         eui[0] ^= 2;
 125 }
 126
 127 static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
 128 {
 129         if (dev->addr_len != ETH_ALEN)
 130                 return -1;
 131
 132         /*
 133          * The zSeries OSA network cards can be shared among various
 134          * OS instances, but the OSA cards have only one MAC address.
 135          * This leads to duplicate address conflicts in conjunction
 136          * with IPv6 if more than one instance uses the same card.
 137          *
 138          * The driver for these cards can deliver a unique 16-bit
 139          * identifier for each instance sharing the same card.  It is
 140          * placed instead of 0xFFFE in the interface identifier.  The
 141          * "u" bit of the interface identifier is not inverted in this
 142          * case.  Hence the resulting interface identifier has local
 143          * scope according to RFC2373.
 144          */
 145
 146         addrconf_addr_eui48_base(eui, dev->dev_addr);
 147
 148         if (dev->dev_id) {
 149                 eui[3] = (dev->dev_id >> 8) & 0xFF;
 150                 eui[4] = dev->dev_id & 0xFF;
 151         } else {
 152                 eui[0] ^= 2;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static inline unsigned long addrconf_timeout_fixup(u32 timeout,
 159                                                    unsigned int unit)
 160 {
 161         if (timeout == 0xffffffff)
 162                 return ~0UL;
 163
 164         /*
 165          * Avoid arithmetic overflow.
 166          * Assuming unit is constant and non-zero, this "if" statement
 167          * will go away on 64bit archs.
 168          */
 169         if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit)
 170                 return LONG_MAX / unit;
 171
 172         return timeout;
 173 }
 174
 175 static inline int addrconf_finite_timeout(unsigned long timeout)
 176 {
 177         return ~timeout;
 178 }
 179
 180 /*
 181  *      IPv6 Address Label subsystem (addrlabel.c)
 182  */
 183 int ipv6_addr_label_init(void);
 184 void ipv6_addr_label_cleanup(void);
 185 void ipv6_addr_label_rtnl_register(void);
 186 u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr,
 187                     int type, int ifindex);
 188
 189 /*
 190  *      multicast prototypes (mcast.c)
 191  */
 192 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 193                       const struct in6_addr *addr);
 194 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 195                       const struct in6_addr *addr);
 196 void __ipv6_sock_mc_close(struct sock *sk);
 197 void ipv6_sock_mc_close(struct sock *sk);
 198 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 199                     const struct in6_addr *src_addr);
 200
 201 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr);
 202 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 203 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr);
 204 void ipv6_mc_up(struct inet6_dev *idev);
 205 void ipv6_mc_down(struct inet6_dev *idev);
 206 void ipv6_mc_unmap(struct inet6_dev *idev);
 207 void ipv6_mc_remap(struct inet6_dev *idev);
 208 void ipv6_mc_init_dev(struct inet6_dev *idev);
 209 void ipv6_mc_destroy_dev(struct inet6_dev *idev);
 210 int ipv6_mc_check_mld(struct sk_buff *skb, struct sk_buff **skb_trimmed);
 211 void addrconf_dad_failure(struct inet6_ifaddr *ifp);
 212
 213 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 214                          const struct in6_addr *src_addr);
 215
 216 void ipv6_mc_dad_complete(struct inet6_dev *idev);
 217
 218 /* A stub used by vxlan module. This is ugly, ideally these
 219  * symbols should be built into the core kernel.
 220  */
 221 struct ipv6_stub {
 222         int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
 223                                  const struct in6_addr *addr);
 224         int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
 225                                  const struct in6_addr *addr);
 226         int (*ipv6_dst_lookup)(struct net *net, struct sock *sk,
 227                                struct dst_entry **dst, struct flowi6 *fl6);
 228         void (*udpv6_encap_enable)(void);
 229         void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
 230                               const struct in6_addr *solicited_addr,
 231                               bool router, bool solicited, bool override, bool inc_opt);
 232         struct neigh_table *nd_tbl;
 233 };
 234 extern const struct ipv6_stub *ipv6_stub __read_mostly;
 235
 236 /*
 237  * identify MLD packets for MLD filter exceptions
 238  */
 239 static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset)
 240 {
 241         struct icmp6hdr *hdr;
 242
 243         if (nexthdr != IPPROTO_ICMPV6 ||
 244             !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr)))
 245                 return false;
 246
 247         hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset);
 248
 249         switch (hdr->icmp6_type) {
 250         case ICMPV6_MGM_QUERY:
 251         case ICMPV6_MGM_REPORT:
 252         case ICMPV6_MGM_REDUCTION:
 253         case ICMPV6_MLD2_REPORT:
 254                 return true;
 255         default:
 256                 break;
 257         }
 258         return false;
 259 }
 260
 261 void addrconf_prefix_rcv(struct net_device *dev,
 262                          u8 *opt, int len, bool sllao);
 263
 264 /*
 265  *      anycast prototypes (anycast.c)
 266  */
 267 int ipv6_sock_ac_join(struct sock *sk, int ifindex,
 268                       const struct in6_addr *addr);
 269 int ipv6_sock_ac_drop(struct sock *sk, int ifindex,
 270                       const struct in6_addr *addr);
 271 void ipv6_sock_ac_close(struct sock *sk);
 272
 273 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr);
 274 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);
 275 void ipv6_ac_destroy_dev(struct inet6_dev *idev);
 276 bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
 277                          const struct in6_addr *addr);
 278 bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,
 279                              const struct in6_addr *addr);
 280
 281 /* Device notifier */
 282 int register_inet6addr_notifier(struct notifier_block *nb);
 283 int unregister_inet6addr_notifier(struct notifier_block *nb);
 284 int inet6addr_notifier_call_chain(unsigned long val, void *v);
 285
 286 int register_inet6addr_validator_notifier(struct notifier_block *nb);
 287 int unregister_inet6addr_validator_notifier(struct notifier_block *nb);
 288 int inet6addr_validator_notifier_call_chain(unsigned long val, void *v);
 289
 290 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
 291                                   int ifindex, struct ipv6_devconf *devconf);
 292
 293 /**
 294  * __in6_dev_get - get inet6_dev pointer from netdevice
 295  * @dev: network device
 296  *
 297  * Caller must hold rcu_read_lock or RTNL, because this function
 298  * does not take a reference on the inet6_dev.
 299  */
 300 static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev)
 301 {
 302         return rcu_dereference_rtnl(dev->ip6_ptr);
 303 }
 304
 305 /**
 306  * in6_dev_get - get inet6_dev pointer from netdevice
 307  * @dev: network device
 308  *
 309  * This version can be used in any context, and takes a reference
 310  * on the inet6_dev. Callers must use in6_dev_put() later to
 311  * release this reference.
 312  */
 313 static inline struct inet6_dev *in6_dev_get(const struct net_device *dev)
 314 {
 315         struct inet6_dev *idev;
 316
 317         rcu_read_lock();
 318         idev = rcu_dereference(dev->ip6_ptr);
 319         if (idev)
 320                 refcount_inc(&idev->refcnt);
 321         rcu_read_unlock();
 322         return idev;
 323 }
 324
 325 static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev)
 326 {
 327         struct inet6_dev *idev = __in6_dev_get(dev);
 328
 329         return idev ? idev->nd_parms : NULL;
 330 }
 331
 332 void in6_dev_finish_destroy(struct inet6_dev *idev);
 333
 334 static inline void in6_dev_put(struct inet6_dev *idev)
 335 {
 336         if (refcount_dec_and_test(&idev->refcnt))
 337                 in6_dev_finish_destroy(idev);
 338 }
 339
 340 static inline void in6_dev_put_clear(struct inet6_dev **pidev)
 341 {
 342         struct inet6_dev *idev = *pidev;
 343
 344         if (idev) {
 345                 in6_dev_put(idev);
 346                 *pidev = NULL;
 347         }
 348 }
 349
 350 static inline void __in6_dev_put(struct inet6_dev *idev)
 351 {
 352         refcount_dec(&idev->refcnt);
 353 }
 354
 355 static inline void in6_dev_hold(struct inet6_dev *idev)
 356 {
 357         refcount_inc(&idev->refcnt);
 358 }
 359
 360 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp);
 361
 362 static inline void in6_ifa_put(struct inet6_ifaddr *ifp)
 363 {
 364         if (refcount_dec_and_test(&ifp->refcnt))
 365                 inet6_ifa_finish_destroy(ifp);
 366 }
 367
 368 static inline void __in6_ifa_put(struct inet6_ifaddr *ifp)
 369 {
 370         refcount_dec(&ifp->refcnt);
 371 }
 372
 373 static inline void in6_ifa_hold(struct inet6_ifaddr *ifp)
 374 {
 375         refcount_inc(&ifp->refcnt);
 376 }
 377
 378
 379 /*
 380  *      compute link-local solicited-node multicast address
 381  */
 382
 383 static inline void addrconf_addr_solict_mult(const struct in6_addr *addr,
 384                                              struct in6_addr *solicited)
 385 {
 386         ipv6_addr_set(solicited,
 387                       htonl(0xFF020000), 0,
 388                       htonl(0x1),
 389                       htonl(0xFF000000) | addr->s6_addr32[3]);
 390 }
 391
 392 static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
 393 {
 394 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 395         __be64 *p = (__be64 *)addr;
 396         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL;
 397 #else
 398         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 399                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 400                 (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
 401 #endif
 402 }
 403
 404 static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
 405 {
 406 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 407         __be64 *p = (__be64 *)addr;
 408         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL;
 409 #else
 410         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 411                 addr->s6_addr32[1] | addr->s6_addr32[2] |
 412                 (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
 413 #endif
 414 }
 415
 416 static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
 417 {
 418         return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE);
 419 }
 420
 421 static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
 422 {
 423 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 424         __be64 *p = (__be64 *)addr;
 425         return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
 426                 ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
 427                  cpu_to_be64(0xffffffffff000000UL))) == 0UL;
 428 #else
 429         return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
 430                 addr->s6_addr32[1] |
 431                 (addr->s6_addr32[2] ^ htonl(0x00000001)) |
 432                 (addr->s6_addr[12] ^ 0xff)) == 0;
 433 #endif
 434 }
 435
 436 #ifdef CONFIG_PROC_FS
 437 int if6_proc_init(void);
 438 void if6_proc_exit(void);
 439 #endif
 440
 441 #endif