include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _NET_IPV6_H
  14 #define _NET_IPV6_H
  15
  16 #include <linux/ipv6.h>
  17 #include <linux/hardirq.h>
  18 #include <linux/jhash.h>
  19 #include <net/if_inet6.h>
  20 #include <net/ndisc.h>
  21 #include <net/flow.h>
  22 #include <net/snmp.h>
  23
  24 #define SIN6_LEN_RFC2133        24
  25
  26 #define IPV6_MAXPLEN            65535
  27
  28 /*
  29  *      NextHeader field of IPv6 header
  30  */
  31
  32 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
  33 #define NEXTHDR_TCP             6       /* TCP segment. */
  34 #define NEXTHDR_UDP             17      /* UDP message. */
  35 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
  36 #define NEXTHDR_ROUTING         43      /* Routing header. */
  37 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
  38 #define NEXTHDR_GRE             47      /* GRE header. */
  39 #define NEXTHDR_ESP             50      /* Encapsulating security payload. */
  40 #define NEXTHDR_AUTH            51      /* Authentication header. */
  41 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  42 #define NEXTHDR_NONE            59      /* No next header */
  43 #define NEXTHDR_DEST            60      /* Destination options header. */
  44 #define NEXTHDR_SCTP            132     /* SCTP message. */
  45 #define NEXTHDR_MOBILITY        135     /* Mobility header. */
  46
  47 #define NEXTHDR_MAX             255
  48
  49
  50
  51 #define IPV6_DEFAULT_HOPLIMIT   64
  52 #define IPV6_DEFAULT_MCASTHOPS  1
  53
  54 /*
  55  *      Addr type
  56  *
  57  *      type    -       unicast | multicast
  58  *      scope   -       local   | site      | global
  59  *      v4      -       compat
  60  *      v4mapped
  61  *      any
  62  *      loopback
  63  */
  64
  65 #define IPV6_ADDR_ANY           0x0000U
  66
  67 #define IPV6_ADDR_UNICAST       0x0001U
  68 #define IPV6_ADDR_MULTICAST     0x0002U
  69
  70 #define IPV6_ADDR_LOOPBACK      0x0010U
  71 #define IPV6_ADDR_LINKLOCAL     0x0020U
  72 #define IPV6_ADDR_SITELOCAL     0x0040U
  73
  74 #define IPV6_ADDR_COMPATv4      0x0080U
  75
  76 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
  77
  78 #define IPV6_ADDR_MAPPED        0x1000U
  79
  80 /*
  81  *      Addr scopes
  82  */
  83 #define IPV6_ADDR_MC_SCOPE(a)   \
  84         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  85 #define __IPV6_ADDR_SCOPE_INVALID       -1
  86 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
  87 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
  88 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
  89 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
  90 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
  91
  92 /*
  93  *      Addr flags
  94  */
  95 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
  96         ((a)->s6_addr[1] & 0x10)
  97 #define IPV6_ADDR_MC_FLAG_PREFIX(a)     \
  98         ((a)->s6_addr[1] & 0x20)
  99 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
 100         ((a)->s6_addr[1] & 0x40)
 101
 102 /*
 103  *      fragmentation header
 104  */
 105
 106 struct frag_hdr {
 107         __u8    nexthdr;
 108         __u8    reserved;
 109         __be16  frag_off;
 110         __be32  identification;
 111 };
 112
 113 #define IP6_MF          0x0001
 114 #define IP6_OFFSET      0xFFF8
 115
 116 #include <net/sock.h>
 117
 118 /* sysctls */
 119 extern int sysctl_mld_max_msf;
 120
 121 #define _DEVINC(net, statname, modifier, idev, field)                   \
 122 ({                                                                      \
 123         struct inet6_dev *_idev = (idev);                               \
 124         if (likely(_idev != NULL))                                      \
 125                 SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
 126         SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 127 })
 128
 129 /* per device counters are atomic_long_t */
 130 #define _DEVINCATOMIC(net, statname, modifier, idev, field)             \
 131 ({                                                                      \
 132         struct inet6_dev *_idev = (idev);                               \
 133         if (likely(_idev != NULL))                                      \
 134                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 135         SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
 136 })
 137
 138 /* per device and per net counters are atomic_long_t */
 139 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
 140 ({                                                                      \
 141         struct inet6_dev *_idev = (idev);                               \
 142         if (likely(_idev != NULL))                                      \
 143                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 144         SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
 145 })
 146
 147 #define _DEVADD(net, statname, modifier, idev, field, val)              \
 148 ({                                                                      \
 149         struct inet6_dev *_idev = (idev);                               \
 150         if (likely(_idev != NULL))                                      \
 151                 SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
 152         SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
 153 })
 154
 155 #define _DEVUPD(net, statname, modifier, idev, field, val)              \
 156 ({                                                                      \
 157         struct inet6_dev *_idev = (idev);                               \
 158         if (likely(_idev != NULL))                                      \
 159                 SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
 160         SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
 161 })
 162
 163 /* MIBs */
 164
 165 #define IP6_INC_STATS(net, idev,field)          \
 166                 _DEVINC(net, ipv6, 64, idev, field)
 167 #define IP6_INC_STATS_BH(net, idev,field)       \
 168                 _DEVINC(net, ipv6, 64_BH, idev, field)
 169 #define IP6_ADD_STATS(net, idev,field,val)      \
 170                 _DEVADD(net, ipv6, 64, idev, field, val)
 171 #define IP6_ADD_STATS_BH(net, idev,field,val)   \
 172                 _DEVADD(net, ipv6, 64_BH, idev, field, val)
 173 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
 174                 _DEVUPD(net, ipv6, 64, idev, field, val)
 175 #define IP6_UPD_PO_STATS_BH(net, idev,field,val)   \
 176                 _DEVUPD(net, ipv6, 64_BH, idev, field, val)
 177 #define ICMP6_INC_STATS(net, idev, field)       \
 178                 _DEVINCATOMIC(net, icmpv6, , idev, field)
 179 #define ICMP6_INC_STATS_BH(net, idev, field)    \
 180                 _DEVINCATOMIC(net, icmpv6, _BH, idev, field)
 181
 182 #define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
 183         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 184 #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field)      \
 185         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 186 #define ICMP6MSGIN_INC_STATS_BH(net, idev, field)       \
 187         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
 188
 189 struct ip6_ra_chain {
 190         struct ip6_ra_chain     *next;
 191         struct sock             *sk;
 192         int                     sel;
 193         void                    (*destructor)(struct sock *);
 194 };
 195
 196 extern struct ip6_ra_chain      *ip6_ra_chain;
 197 extern rwlock_t ip6_ra_lock;
 198
 199 /*
 200    This structure is prepared by protocol, when parsing
 201    ancillary data and passed to IPv6.
 202  */
 203
 204 struct ipv6_txoptions {
 205         /* Length of this structure */
 206         int                     tot_len;
 207
 208         /* length of extension headers   */
 209
 210         __u16                   opt_flen;       /* after fragment hdr */
 211         __u16                   opt_nflen;      /* before fragment hdr */
 212
 213         struct ipv6_opt_hdr     *hopopt;
 214         struct ipv6_opt_hdr     *dst0opt;
 215         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 216         struct ipv6_opt_hdr     *dst1opt;
 217
 218         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 219 };
 220
 221 struct ip6_flowlabel {
 222         struct ip6_flowlabel __rcu *next;
 223         __be32                  label;
 224         atomic_t                users;
 225         struct in6_addr         dst;
 226         struct ipv6_txoptions   *opt;
 227         unsigned long           linger;
 228         struct rcu_head         rcu;
 229         u8                      share;
 230         union {
 231                 struct pid *pid;
 232                 kuid_t uid;
 233         } owner;
 234         unsigned long           lastuse;
 235         unsigned long           expires;
 236         struct net              *fl_net;
 237 };
 238
 239 #define IPV6_FLOWINFO_MASK      cpu_to_be32(0x0FFFFFFF)
 240 #define IPV6_FLOWLABEL_MASK     cpu_to_be32(0x000FFFFF)
 241 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
 242 #define IPV6_TCLASS_SHIFT       20
 243
 244 struct ipv6_fl_socklist {
 245         struct ipv6_fl_socklist __rcu   *next;
 246         struct ip6_flowlabel            *fl;
 247         struct rcu_head                 rcu;
 248 };
 249
 250 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
 251 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
 252                                          struct ip6_flowlabel *fl,
 253                                          struct ipv6_txoptions *fopt);
 254 void fl6_free_socklist(struct sock *sk);
 255 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 256 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
 257                            int flags);
 258 int ip6_flowlabel_init(void);
 259 void ip6_flowlabel_cleanup(void);
 260
 261 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 262 {
 263         if (fl)
 264                 atomic_dec(&fl->users);
 265 }
 266
 267 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
 268
 269 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
 270                                struct icmp6hdr *thdr, int len);
 271
 272 int ip6_ra_control(struct sock *sk, int sel);
 273
 274 int ipv6_parse_hopopts(struct sk_buff *skb);
 275
 276 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
 277                                         struct ipv6_txoptions *opt);
 278 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
 279                                           struct ipv6_txoptions *opt,
 280                                           int newtype,
 281                                           struct ipv6_opt_hdr __user *newopt,
 282                                           int newoptlen);
 283 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 284                                           struct ipv6_txoptions *opt);
 285
 286 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
 287
 288 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
 289 {
 290         /* If forwarding is enabled, RA are not accepted unless the special
 291          * hybrid mode (accept_ra=2) is enabled.
 292          */
 293         return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
 294             idev->cnf.accept_ra;
 295 }
 296
 297 #if IS_ENABLED(CONFIG_IPV6)
 298 static inline int ip6_frag_nqueues(struct net *net)
 299 {
 300         return net->ipv6.frags.nqueues;
 301 }
 302
 303 static inline int ip6_frag_mem(struct net *net)
 304 {
 305         return sum_frag_mem_limit(&net->ipv6.frags);
 306 }
 307 #endif
 308
 309 #define IPV6_FRAG_HIGH_THRESH   (4 * 1024*1024) /* 4194304 */
 310 #define IPV6_FRAG_LOW_THRESH    (3 * 1024*1024) /* 3145728 */
 311 #define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
 312
 313 int __ipv6_addr_type(const struct in6_addr *addr);
 314 static inline int ipv6_addr_type(const struct in6_addr *addr)
 315 {
 316         return __ipv6_addr_type(addr) & 0xffff;
 317 }
 318
 319 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 320 {
 321         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 322 }
 323
 324 static inline int __ipv6_addr_src_scope(int type)
 325 {
 326         return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
 327 }
 328
 329 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 330 {
 331         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 332 }
 333
 334 static inline bool __ipv6_addr_needs_scope_id(int type)
 335 {
 336         return type & IPV6_ADDR_LINKLOCAL ||
 337                (type & IPV6_ADDR_MULTICAST &&
 338                 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
 339 }
 340
 341 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
 342 {
 343         return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
 344 }
 345
 346 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 347 {
 348         return memcmp(a1, a2, sizeof(struct in6_addr));
 349 }
 350
 351 static inline bool
 352 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 353                      const struct in6_addr *a2)
 354 {
 355 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 356         const unsigned long *ul1 = (const unsigned long *)a1;
 357         const unsigned long *ulm = (const unsigned long *)m;
 358         const unsigned long *ul2 = (const unsigned long *)a2;
 359
 360         return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
 361                   ((ul1[1] ^ ul2[1]) & ulm[1]));
 362 #else
 363         return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 364                   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 365                   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 366                   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
 367 #endif
 368 }
 369
 370 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 371                                     const struct in6_addr *addr,
 372                                     int plen)
 373 {
 374         /* caller must guarantee 0 <= plen <= 128 */
 375         int o = plen >> 3,
 376             b = plen & 0x7;
 377
 378         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 379         memcpy(pfx->s6_addr, addr, o);
 380         if (b != 0)
 381                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 382 }
 383
 384 static inline void __ipv6_addr_set_half(__be32 *addr,
 385                                         __be32 wh, __be32 wl)
 386 {
 387 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 388 #if defined(__BIG_ENDIAN)
 389         if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
 390                 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
 391                 return;
 392         }
 393 #elif defined(__LITTLE_ENDIAN)
 394         if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
 395                 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
 396                 return;
 397         }
 398 #endif
 399 #endif
 400         addr[0] = wh;
 401         addr[1] = wl;
 402 }
 403
 404 static inline void ipv6_addr_set(struct in6_addr *addr,
 405                                      __be32 w1, __be32 w2,
 406                                      __be32 w3, __be32 w4)
 407 {
 408         __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
 409         __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
 410 }
 411
 412 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
 413                                    const struct in6_addr *a2)
 414 {
 415 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 416         const unsigned long *ul1 = (const unsigned long *)a1;
 417         const unsigned long *ul2 = (const unsigned long *)a2;
 418
 419         return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
 420 #else
 421         return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 422                 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 423                 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 424                 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
 425 #endif
 426 }
 427
 428 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 429 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
 430                                               const __be64 *a2,
 431                                               unsigned int len)
 432 {
 433         if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
 434                 return false;
 435         return true;
 436 }
 437
 438 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
 439                                      const struct in6_addr *addr2,
 440                                      unsigned int prefixlen)
 441 {
 442         const __be64 *a1 = (const __be64 *)addr1;
 443         const __be64 *a2 = (const __be64 *)addr2;
 444
 445         if (prefixlen >= 64) {
 446                 if (a1[0] ^ a2[0])
 447                         return false;
 448                 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
 449         }
 450         return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
 451 }
 452 #else
 453 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
 454                                      const struct in6_addr *addr2,
 455                                      unsigned int prefixlen)
 456 {
 457         const __be32 *a1 = addr1->s6_addr32;
 458         const __be32 *a2 = addr2->s6_addr32;
 459         unsigned int pdw, pbi;
 460
 461         /* check complete u32 in prefix */
 462         pdw = prefixlen >> 5;
 463         if (pdw && memcmp(a1, a2, pdw << 2))
 464                 return false;
 465
 466         /* check incomplete u32 in prefix */
 467         pbi = prefixlen & 0x1f;
 468         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 469                 return false;
 470
 471         return true;
 472 }
 473 #endif
 474
 475 struct inet_frag_queue;
 476
 477 enum ip6_defrag_users {
 478         IP6_DEFRAG_LOCAL_DELIVER,
 479         IP6_DEFRAG_CONNTRACK_IN,
 480         __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
 481         IP6_DEFRAG_CONNTRACK_OUT,
 482         __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
 483         IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
 484         __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
 485 };
 486
 487 struct ip6_create_arg {
 488         __be32 id;
 489         u32 user;
 490         const struct in6_addr *src;
 491         const struct in6_addr *dst;
 492         u8 ecn;
 493 };
 494
 495 void ip6_frag_init(struct inet_frag_queue *q, void *a);
 496 bool ip6_frag_match(struct inet_frag_queue *q, void *a);
 497
 498 /*
 499  *      Equivalent of ipv4 struct ip
 500  */
 501 struct frag_queue {
 502         struct inet_frag_queue  q;
 503
 504         __be32                  id;             /* fragment id          */
 505         u32                     user;
 506         struct in6_addr         saddr;
 507         struct in6_addr         daddr;
 508
 509         int                     iif;
 510         unsigned int            csum;
 511         __u16                   nhoffset;
 512         u8                      ecn;
 513 };
 514
 515 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
 516                            struct inet_frags *frags);
 517
 518 static inline bool ipv6_addr_any(const struct in6_addr *a)
 519 {
 520 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 521         const unsigned long *ul = (const unsigned long *)a;
 522
 523         return (ul[0] | ul[1]) == 0UL;
 524 #else
 525         return (a->s6_addr32[0] | a->s6_addr32[1] |
 526                 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
 527 #endif
 528 }
 529
 530 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
 531 {
 532 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 533         const unsigned long *ul = (const unsigned long *)a;
 534         unsigned long x = ul[0] ^ ul[1];
 535
 536         return (u32)(x ^ (x >> 32));
 537 #else
 538         return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
 539                              a->s6_addr32[2] ^ a->s6_addr32[3]);
 540 #endif
 541 }
 542
 543 /* more secured version of ipv6_addr_hash() */
 544 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
 545 {
 546         u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
 547
 548         return jhash_3words(v,
 549                             (__force u32)a->s6_addr32[2],
 550                             (__force u32)a->s6_addr32[3],
 551                             initval);
 552 }
 553
 554 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 555 {
 556 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 557         const unsigned long *ul = (const unsigned long *)a;
 558
 559         return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
 560 #else
 561         return (a->s6_addr32[0] | a->s6_addr32[1] |
 562                 a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
 563 #endif
 564 }
 565
 566 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 567 {
 568         return (
 569 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 570                 *(__be64 *)a |
 571 #else
 572                 (a->s6_addr32[0] | a->s6_addr32[1]) |
 573 #endif
 574                 (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
 575 }
 576
 577 /*
 578  * Check for a RFC 4843 ORCHID address
 579  * (Overlay Routable Cryptographic Hash Identifiers)
 580  */
 581 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
 582 {
 583         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
 584 }
 585
 586 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 587                                           struct in6_addr *v4mapped)
 588 {
 589         ipv6_addr_set(v4mapped,
 590                         0, 0,
 591                         htonl(0x0000FFFF),
 592                         addr);
 593 }
 594
 595 /*
 596  * find the first different bit between two addresses
 597  * length of address must be a multiple of 32bits
 598  */
 599 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
 600 {
 601         const __be32 *a1 = token1, *a2 = token2;
 602         int i;
 603
 604         addrlen >>= 2;
 605
 606         for (i = 0; i < addrlen; i++) {
 607                 __be32 xb = a1[i] ^ a2[i];
 608                 if (xb)
 609                         return i * 32 + 31 - __fls(ntohl(xb));
 610         }
 611
 612         /*
 613          *      we should *never* get to this point since that
 614          *      would mean the addrs are equal
 615          *
 616          *      However, we do get to it 8) And exacly, when
 617          *      addresses are equal 8)
 618          *
 619          *      ip route add 1111::/128 via ...
 620          *      ip route add 1111::/64 via ...
 621          *      and we are here.
 622          *
 623          *      Ideally, this function should stop comparison
 624          *      at prefix length. It does not, but it is still OK,
 625          *      if returned value is greater than prefix length.
 626          *                                      --ANK (980803)
 627          */
 628         return addrlen << 5;
 629 }
 630
 631 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 632 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
 633 {
 634         const __be64 *a1 = token1, *a2 = token2;
 635         int i;
 636
 637         addrlen >>= 3;
 638
 639         for (i = 0; i < addrlen; i++) {
 640                 __be64 xb = a1[i] ^ a2[i];
 641                 if (xb)
 642                         return i * 64 + 63 - __fls(be64_to_cpu(xb));
 643         }
 644
 645         return addrlen << 6;
 646 }
 647 #endif
 648
 649 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 650 {
 651 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 652         if (__builtin_constant_p(addrlen) && !(addrlen & 7))
 653                 return __ipv6_addr_diff64(token1, token2, addrlen);
 654 #endif
 655         return __ipv6_addr_diff32(token1, token2, addrlen);
 656 }
 657
 658 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 659 {
 660         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 661 }
 662
 663 void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
 664
 665 int ip6_dst_hoplimit(struct dst_entry *dst);
 666
 667 /*
 668  *      Header manipulation
 669  */
 670 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
 671                                 __be32 flowlabel)
 672 {
 673         *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
 674 }
 675
 676 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
 677 {
 678         return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
 679 }
 680
 681 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
 682 {
 683         return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
 684 }
 685
 686 static inline u8 ip6_tclass(__be32 flowinfo)
 687 {
 688         return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
 689 }
 690 /*
 691  *      Prototypes exported by ipv6
 692  */
 693
 694 /*
 695  *      rcv function (called from netdevice level)
 696  */
 697
 698 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
 699              struct packet_type *pt, struct net_device *orig_dev);
 700
 701 int ip6_rcv_finish(struct sk_buff *skb);
 702
 703 /*
 704  *      upper-layer output functions
 705  */
 706 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
 707              struct ipv6_txoptions *opt, int tclass);
 708
 709 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 710
 711 int ip6_append_data(struct sock *sk,
 712                     int getfrag(void *from, char *to, int offset, int len,
 713                                 int odd, struct sk_buff *skb),
 714                     void *from, int length, int transhdrlen, int hlimit,
 715                     int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6,
 716                     struct rt6_info *rt, unsigned int flags, int dontfrag);
 717
 718 int ip6_push_pending_frames(struct sock *sk);
 719
 720 void ip6_flush_pending_frames(struct sock *sk);
 721
 722 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
 723 struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
 724                                       const struct in6_addr *final_dst);
 725 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
 726                                          const struct in6_addr *final_dst);
 727 struct dst_entry *ip6_blackhole_route(struct net *net,
 728                                       struct dst_entry *orig_dst);
 729
 730 /*
 731  *      skb processing functions
 732  */
 733
 734 int ip6_output(struct sk_buff *skb);
 735 int ip6_forward(struct sk_buff *skb);
 736 int ip6_input(struct sk_buff *skb);
 737 int ip6_mc_input(struct sk_buff *skb);
 738
 739 int __ip6_local_out(struct sk_buff *skb);
 740 int ip6_local_out(struct sk_buff *skb);
 741
 742 /*
 743  *      Extension header (options) processing
 744  */
 745
 746 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
 747                           u8 *proto, struct in6_addr **daddr_p);
 748 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
 749                          u8 *proto);
 750
 751 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
 752                      __be16 *frag_offp);
 753
 754 bool ipv6_ext_hdr(u8 nexthdr);
 755
 756 enum {
 757         IP6_FH_F_FRAG           = (1 << 0),
 758         IP6_FH_F_AUTH           = (1 << 1),
 759         IP6_FH_F_SKIP_RH        = (1 << 2),
 760 };
 761
 762 /* find specified header and get offset to it */
 763 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
 764                   unsigned short *fragoff, int *fragflg);
 765
 766 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
 767
 768 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
 769                                 const struct ipv6_txoptions *opt,
 770                                 struct in6_addr *orig);
 771
 772 /*
 773  *      socket options (ipv6_sockglue.c)
 774  */
 775
 776 int ipv6_setsockopt(struct sock *sk, int level, int optname,
 777                     char __user *optval, unsigned int optlen);
 778 int ipv6_getsockopt(struct sock *sk, int level, int optname,
 779                     char __user *optval, int __user *optlen);
 780 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 781                            char __user *optval, unsigned int optlen);
 782 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
 783                            char __user *optval, int __user *optlen);
 784
 785 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
 786 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
 787                                  int addr_len);
 788
 789 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 790                     int *addr_len);
 791 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
 792                      int *addr_len);
 793 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 794                      u32 info, u8 *payload);
 795 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
 796 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
 797
 798 int inet6_release(struct socket *sock);
 799 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
 800 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
 801                   int peer);
 802 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 803
 804 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 805                               struct sock *sk);
 806
 807 /*
 808  * reassembly.c
 809  */
 810 extern const struct proto_ops inet6_stream_ops;
 811 extern const struct proto_ops inet6_dgram_ops;
 812
 813 struct group_source_req;
 814 struct group_filter;
 815
 816 int ip6_mc_source(int add, int omode, struct sock *sk,
 817                   struct group_source_req *pgsr);
 818 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 819 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 820                   struct group_filter __user *optval, int __user *optlen);
 821
 822 #ifdef CONFIG_PROC_FS
 823 int ac6_proc_init(struct net *net);
 824 void ac6_proc_exit(struct net *net);
 825 int raw6_proc_init(void);
 826 void raw6_proc_exit(void);
 827 int tcp6_proc_init(struct net *net);
 828 void tcp6_proc_exit(struct net *net);
 829 int udp6_proc_init(struct net *net);
 830 void udp6_proc_exit(struct net *net);
 831 int udplite6_proc_init(void);
 832 void udplite6_proc_exit(void);
 833 int ipv6_misc_proc_init(void);
 834 void ipv6_misc_proc_exit(void);
 835 int snmp6_register_dev(struct inet6_dev *idev);
 836 int snmp6_unregister_dev(struct inet6_dev *idev);
 837
 838 #else
 839 static inline int ac6_proc_init(struct net *net) { return 0; }
 840 static inline void ac6_proc_exit(struct net *net) { }
 841 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
 842 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
 843 #endif
 844
 845 #ifdef CONFIG_SYSCTL
 846 extern struct ctl_table ipv6_route_table_template[];
 847
 848 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
 849 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
 850 int ipv6_sysctl_register(void);
 851 void ipv6_sysctl_unregister(void);
 852 #endif
 853
 854 #endif /* _NET_IPV6_H */