include/net/ipv6.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  */
   8
   9 #ifndef _NET_IPV6_H
  10 #define _NET_IPV6_H
  11
  12 #include <linux/ipv6.h>
  13 #include <linux/hardirq.h>
  14 #include <linux/jhash.h>
  15 #include <linux/refcount.h>
  16 #include <linux/jump_label_ratelimit.h>
  17 #include <net/if_inet6.h>
  18 #include <net/ndisc.h>
  19 #include <net/flow.h>
  20 #include <net/flow_dissector.h>
  21 #include <net/snmp.h>
  22 #include <net/netns/hash.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 #define IPV6_DEFAULT_HOPLIMIT   64
  50 #define IPV6_DEFAULT_MCASTHOPS  1
  51
  52 /* Limits on Hop-by-Hop and Destination options.
  53  *
  54  * Per RFC8200 there is no limit on the maximum number or lengths of options in
  55  * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
  56  * We allow configurable limits in order to mitigate potential denial of
  57  * service attacks.
  58  *
  59  * There are three limits that may be set:
  60  *   - Limit the number of options in a Hop-by-Hop or Destination options
  61  *     extension header
  62  *   - Limit the byte length of a Hop-by-Hop or Destination options extension
  63  *     header
  64  *   - Disallow unknown options
  65  *
  66  * The limits are expressed in corresponding sysctls:
  67  *
  68  * ipv6.sysctl.max_dst_opts_cnt
  69  * ipv6.sysctl.max_hbh_opts_cnt
  70  * ipv6.sysctl.max_dst_opts_len
  71  * ipv6.sysctl.max_hbh_opts_len
  72  *
  73  * max_*_opts_cnt is the number of TLVs that are allowed for Destination
  74  * options or Hop-by-Hop options. If the number is less than zero then unknown
  75  * TLVs are disallowed and the number of known options that are allowed is the
  76  * absolute value. Setting the value to INT_MAX indicates no limit.
  77  *
  78  * max_*_opts_len is the length limit in bytes of a Destination or
  79  * Hop-by-Hop options extension header. Setting the value to INT_MAX
  80  * indicates no length limit.
  81  *
  82  * If a limit is exceeded when processing an extension header the packet is
  83  * silently discarded.
  84  */
  85
  86 /* Default limits for Hop-by-Hop and Destination options */
  87 #define IP6_DEFAULT_MAX_DST_OPTS_CNT     8
  88 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT     8
  89 #define IP6_DEFAULT_MAX_DST_OPTS_LEN     INT_MAX /* No limit */
  90 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN     INT_MAX /* No limit */
  91
  92 /*
  93  *      Addr type
  94  *
  95  *      type    -       unicast | multicast
  96  *      scope   -       local   | site      | global
  97  *      v4      -       compat
  98  *      v4mapped
  99  *      any
 100  *      loopback
 101  */
 102
 103 #define IPV6_ADDR_ANY           0x0000U
 104
 105 #define IPV6_ADDR_UNICAST       0x0001U
 106 #define IPV6_ADDR_MULTICAST     0x0002U
 107
 108 #define IPV6_ADDR_LOOPBACK      0x0010U
 109 #define IPV6_ADDR_LINKLOCAL     0x0020U
 110 #define IPV6_ADDR_SITELOCAL     0x0040U
 111
 112 #define IPV6_ADDR_COMPATv4      0x0080U
 113
 114 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
 115
 116 #define IPV6_ADDR_MAPPED        0x1000U
 117
 118 /*
 119  *      Addr scopes
 120  */
 121 #define IPV6_ADDR_MC_SCOPE(a)   \
 122         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
 123 #define __IPV6_ADDR_SCOPE_INVALID       -1
 124 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
 125 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
 126 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
 127 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
 128 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
 129
 130 /*
 131  *      Addr flags
 132  */
 133 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
 134         ((a)->s6_addr[1] & 0x10)
 135 #define IPV6_ADDR_MC_FLAG_PREFIX(a)     \
 136         ((a)->s6_addr[1] & 0x20)
 137 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
 138         ((a)->s6_addr[1] & 0x40)
 139
 140 /*
 141  *      fragmentation header
 142  */
 143
 144 struct frag_hdr {
 145         __u8    nexthdr;
 146         __u8    reserved;
 147         __be16  frag_off;
 148         __be32  identification;
 149 };
 150
 151 #define IP6_MF          0x0001
 152 #define IP6_OFFSET      0xFFF8
 153
 154 struct ip6_fraglist_iter {
 155         struct ipv6hdr  *tmp_hdr;
 156         struct sk_buff  *frag;
 157         int             offset;
 158         unsigned int    hlen;
 159         __be32          frag_id;
 160         u8              nexthdr;
 161 };
 162
 163 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
 164                       u8 nexthdr, __be32 frag_id,
 165                       struct ip6_fraglist_iter *iter);
 166 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
 167
 168 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
 169 {
 170         struct sk_buff *skb = iter->frag;
 171
 172         iter->frag = skb->next;
 173         skb_mark_not_on_list(skb);
 174
 175         return skb;
 176 }
 177
 178 struct ip6_frag_state {
 179         u8              *prevhdr;
 180         unsigned int    hlen;
 181         unsigned int    mtu;
 182         unsigned int    left;
 183         int             offset;
 184         int             ptr;
 185         int             hroom;
 186         int             troom;
 187         __be32          frag_id;
 188         u8              nexthdr;
 189 };
 190
 191 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
 192                    unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
 193                    u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
 194 struct sk_buff *ip6_frag_next(struct sk_buff *skb,
 195                               struct ip6_frag_state *state);
 196
 197 #define IP6_REPLY_MARK(net, mark) \
 198         ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
 199
 200 #include <net/sock.h>
 201
 202 /* sysctls */
 203 extern int sysctl_mld_max_msf;
 204 extern int sysctl_mld_qrv;
 205
 206 #define _DEVINC(net, statname, mod, idev, field)                        \
 207 ({                                                                      \
 208         struct inet6_dev *_idev = (idev);                               \
 209         if (likely(_idev != NULL))                                      \
 210                 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
 211         mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
 212 })
 213
 214 /* per device counters are atomic_long_t */
 215 #define _DEVINCATOMIC(net, statname, mod, idev, field)                  \
 216 ({                                                                      \
 217         struct inet6_dev *_idev = (idev);                               \
 218         if (likely(_idev != NULL))                                      \
 219                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 220         mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
 221 })
 222
 223 /* per device and per net counters are atomic_long_t */
 224 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
 225 ({                                                                      \
 226         struct inet6_dev *_idev = (idev);                               \
 227         if (likely(_idev != NULL))                                      \
 228                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
 229         SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
 230 })
 231
 232 #define _DEVADD(net, statname, mod, idev, field, val)                   \
 233 ({                                                                      \
 234         struct inet6_dev *_idev = (idev);                               \
 235         if (likely(_idev != NULL))                                      \
 236                 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
 237         mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
 238 })
 239
 240 #define _DEVUPD(net, statname, mod, idev, field, val)                   \
 241 ({                                                                      \
 242         struct inet6_dev *_idev = (idev);                               \
 243         if (likely(_idev != NULL))                                      \
 244                 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
 245         mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
 246 })
 247
 248 /* MIBs */
 249
 250 #define IP6_INC_STATS(net, idev,field)          \
 251                 _DEVINC(net, ipv6, , idev, field)
 252 #define __IP6_INC_STATS(net, idev,field)        \
 253                 _DEVINC(net, ipv6, __, idev, field)
 254 #define IP6_ADD_STATS(net, idev,field,val)      \
 255                 _DEVADD(net, ipv6, , idev, field, val)
 256 #define __IP6_ADD_STATS(net, idev,field,val)    \
 257                 _DEVADD(net, ipv6, __, idev, field, val)
 258 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
 259                 _DEVUPD(net, ipv6, , idev, field, val)
 260 #define __IP6_UPD_PO_STATS(net, idev,field,val)   \
 261                 _DEVUPD(net, ipv6, __, idev, field, val)
 262 #define ICMP6_INC_STATS(net, idev, field)       \
 263                 _DEVINCATOMIC(net, icmpv6, , idev, field)
 264 #define __ICMP6_INC_STATS(net, idev, field)     \
 265                 _DEVINCATOMIC(net, icmpv6, __, idev, field)
 266
 267 #define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
 268         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
 269 #define ICMP6MSGIN_INC_STATS(net, idev, field)  \
 270         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
 271
 272 struct ip6_ra_chain {
 273         struct ip6_ra_chain     *next;
 274         struct sock             *sk;
 275         int                     sel;
 276         void                    (*destructor)(struct sock *);
 277 };
 278
 279 extern struct ip6_ra_chain      *ip6_ra_chain;
 280 extern rwlock_t ip6_ra_lock;
 281
 282 /*
 283    This structure is prepared by protocol, when parsing
 284    ancillary data and passed to IPv6.
 285  */
 286
 287 struct ipv6_txoptions {
 288         refcount_t              refcnt;
 289         /* Length of this structure */
 290         int                     tot_len;
 291
 292         /* length of extension headers   */
 293
 294         __u16                   opt_flen;       /* after fragment hdr */
 295         __u16                   opt_nflen;      /* before fragment hdr */
 296
 297         struct ipv6_opt_hdr     *hopopt;
 298         struct ipv6_opt_hdr     *dst0opt;
 299         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 300         struct ipv6_opt_hdr     *dst1opt;
 301         struct rcu_head         rcu;
 302         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 303 };
 304
 305 /* flowlabel_reflect sysctl values */
 306 enum flowlabel_reflect {
 307         FLOWLABEL_REFLECT_ESTABLISHED           = 1,
 308         FLOWLABEL_REFLECT_TCP_RESET             = 2,
 309         FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES   = 4,
 310 };
 311
 312 struct ip6_flowlabel {
 313         struct ip6_flowlabel __rcu *next;
 314         __be32                  label;
 315         atomic_t                users;
 316         struct in6_addr         dst;
 317         struct ipv6_txoptions   *opt;
 318         unsigned long           linger;
 319         struct rcu_head         rcu;
 320         u8                      share;
 321         union {
 322                 struct pid *pid;
 323                 kuid_t uid;
 324         } owner;
 325         unsigned long           lastuse;
 326         unsigned long           expires;
 327         struct net              *fl_net;
 328 };
 329
 330 #define IPV6_FLOWINFO_MASK              cpu_to_be32(0x0FFFFFFF)
 331 #define IPV6_FLOWLABEL_MASK             cpu_to_be32(0x000FFFFF)
 332 #define IPV6_FLOWLABEL_STATELESS_FLAG   cpu_to_be32(0x00080000)
 333
 334 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
 335 #define IPV6_TCLASS_SHIFT       20
 336
 337 struct ipv6_fl_socklist {
 338         struct ipv6_fl_socklist __rcu   *next;
 339         struct ip6_flowlabel            *fl;
 340         struct rcu_head                 rcu;
 341 };
 342
 343 struct ipcm6_cookie {
 344         struct sockcm_cookie sockc;
 345         __s16 hlimit;
 346         __s16 tclass;
 347         __s8  dontfrag;
 348         struct ipv6_txoptions *opt;
 349         __u16 gso_size;
 350 };
 351
 352 static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
 353 {
 354         *ipc6 = (struct ipcm6_cookie) {
 355                 .hlimit = -1,
 356                 .tclass = -1,
 357                 .dontfrag = -1,
 358         };
 359 }
 360
 361 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
 362                                  const struct ipv6_pinfo *np)
 363 {
 364         *ipc6 = (struct ipcm6_cookie) {
 365                 .hlimit = -1,
 366                 .tclass = np->tclass,
 367                 .dontfrag = np->dontfrag,
 368         };
 369 }
 370
 371 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
 372 {
 373         struct ipv6_txoptions *opt;
 374
 375         rcu_read_lock();
 376         opt = rcu_dereference(np->opt);
 377         if (opt) {
 378                 if (!refcount_inc_not_zero(&opt->refcnt))
 379                         opt = NULL;
 380                 else
 381                         opt = rcu_pointer_handoff(opt);
 382         }
 383         rcu_read_unlock();
 384         return opt;
 385 }
 386
 387 static inline void txopt_put(struct ipv6_txoptions *opt)
 388 {
 389         if (opt && refcount_dec_and_test(&opt->refcnt))
 390                 kfree_rcu(opt, rcu);
 391 }
 392
 393 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
 394
 395 extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
 396 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
 397                                                     __be32 label)
 398 {
 399         if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key))
 400                 return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
 401
 402         return NULL;
 403 }
 404
 405 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
 406                                          struct ip6_flowlabel *fl,
 407                                          struct ipv6_txoptions *fopt);
 408 void fl6_free_socklist(struct sock *sk);
 409 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 410 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
 411                            int flags);
 412 int ip6_flowlabel_init(void);
 413 void ip6_flowlabel_cleanup(void);
 414 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
 415
 416 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 417 {
 418         if (fl)
 419                 atomic_dec(&fl->users);
 420 }
 421
 422 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
 423
 424 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
 425                                 struct icmp6hdr *thdr, int len);
 426
 427 int ip6_ra_control(struct sock *sk, int sel);
 428
 429 int ipv6_parse_hopopts(struct sk_buff *skb);
 430
 431 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
 432                                         struct ipv6_txoptions *opt);
 433 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
 434                                           struct ipv6_txoptions *opt,
 435                                           int newtype,
 436                                           struct ipv6_opt_hdr *newopt);
 437 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 438                                           struct ipv6_txoptions *opt);
 439
 440 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 441                        const struct inet6_skb_parm *opt);
 442 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
 443                                            struct ipv6_txoptions *opt);
 444
 445 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
 446 {
 447         /* If forwarding is enabled, RA are not accepted unless the special
 448          * hybrid mode (accept_ra=2) is enabled.
 449          */
 450         return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
 451             idev->cnf.accept_ra;
 452 }
 453
 454 #define IPV6_FRAG_HIGH_THRESH   (4 * 1024*1024) /* 4194304 */
 455 #define IPV6_FRAG_LOW_THRESH    (3 * 1024*1024) /* 3145728 */
 456 #define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
 457
 458 int __ipv6_addr_type(const struct in6_addr *addr);
 459 static inline int ipv6_addr_type(const struct in6_addr *addr)
 460 {
 461         return __ipv6_addr_type(addr) & 0xffff;
 462 }
 463
 464 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 465 {
 466         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 467 }
 468
 469 static inline int __ipv6_addr_src_scope(int type)
 470 {
 471         return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
 472 }
 473
 474 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 475 {
 476         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 477 }
 478
 479 static inline bool __ipv6_addr_needs_scope_id(int type)
 480 {
 481         return type & IPV6_ADDR_LINKLOCAL ||
 482                (type & IPV6_ADDR_MULTICAST &&
 483                 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
 484 }
 485
 486 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
 487 {
 488         return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
 489 }
 490
 491 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 492 {
 493         return memcmp(a1, a2, sizeof(struct in6_addr));
 494 }
 495
 496 static inline bool
 497 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 498                      const struct in6_addr *a2)
 499 {
 500 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 501         const unsigned long *ul1 = (const unsigned long *)a1;
 502         const unsigned long *ulm = (const unsigned long *)m;
 503         const unsigned long *ul2 = (const unsigned long *)a2;
 504
 505         return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
 506                   ((ul1[1] ^ ul2[1]) & ulm[1]));
 507 #else
 508         return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
 509                   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
 510                   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
 511                   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
 512 #endif
 513 }
 514
 515 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 516                                     const struct in6_addr *addr,
 517                                     int plen)
 518 {
 519         /* caller must guarantee 0 <= plen <= 128 */
 520         int o = plen >> 3,
 521             b = plen & 0x7;
 522
 523         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
 524         memcpy(pfx->s6_addr, addr, o);
 525         if (b != 0)
 526                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 527 }
 528
 529 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
 530                                          const struct in6_addr *pfx,
 531                                          int plen)
 532 {
 533         /* caller must guarantee 0 <= plen <= 128 */
 534         int o = plen >> 3,
 535             b = plen & 0x7;
 536
 537         memcpy(addr->s6_addr, pfx, o);
 538         if (b != 0) {
 539                 addr->s6_addr[o] &= ~(0xff00 >> b);
 540                 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
 541         }
 542 }
 543
 544 static inline void __ipv6_addr_set_half(__be32 *addr,
 545                                         __be32 wh, __be32 wl)
 546 {
 547 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 548 #if defined(__BIG_ENDIAN)
 549         if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
 550                 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
 551                 return;
 552         }
 553 #elif defined(__LITTLE_ENDIAN)
 554         if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
 555                 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
 556                 return;
 557         }
 558 #endif
 559 #endif
 560         addr[0] = wh;
 561         addr[1] = wl;
 562 }
 563
 564 static inline void ipv6_addr_set(struct in6_addr *addr,
 565                                      __be32 w1, __be32 w2,
 566                                      __be32 w3, __be32 w4)
 567 {
 568         __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
 569         __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
 570 }
 571
 572 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
 573                                    const struct in6_addr *a2)
 574 {
 575 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 576         const unsigned long *ul1 = (const unsigned long *)a1;
 577         const unsigned long *ul2 = (const unsigned long *)a2;
 578
 579         return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
 580 #else
 581         return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
 582                 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
 583                 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
 584                 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
 585 #endif
 586 }
 587
 588 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 589 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
 590                                               const __be64 *a2,
 591                                               unsigned int len)
 592 {
 593         if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
 594                 return false;
 595         return true;
 596 }
 597
 598 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
 599                                      const struct in6_addr *addr2,
 600                                      unsigned int prefixlen)
 601 {
 602         const __be64 *a1 = (const __be64 *)addr1;
 603         const __be64 *a2 = (const __be64 *)addr2;
 604
 605         if (prefixlen >= 64) {
 606                 if (a1[0] ^ a2[0])
 607                         return false;
 608                 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
 609         }
 610         return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
 611 }
 612 #else
 613 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
 614                                      const struct in6_addr *addr2,
 615                                      unsigned int prefixlen)
 616 {
 617         const __be32 *a1 = addr1->s6_addr32;
 618         const __be32 *a2 = addr2->s6_addr32;
 619         unsigned int pdw, pbi;
 620
 621         /* check complete u32 in prefix */
 622         pdw = prefixlen >> 5;
 623         if (pdw && memcmp(a1, a2, pdw << 2))
 624                 return false;
 625
 626         /* check incomplete u32 in prefix */
 627         pbi = prefixlen & 0x1f;
 628         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 629                 return false;
 630
 631         return true;
 632 }
 633 #endif
 634
 635 static inline bool ipv6_addr_any(const struct in6_addr *a)
 636 {
 637 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 638         const unsigned long *ul = (const unsigned long *)a;
 639
 640         return (ul[0] | ul[1]) == 0UL;
 641 #else
 642         return (a->s6_addr32[0] | a->s6_addr32[1] |
 643                 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
 644 #endif
 645 }
 646
 647 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
 648 {
 649 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 650         const unsigned long *ul = (const unsigned long *)a;
 651         unsigned long x = ul[0] ^ ul[1];
 652
 653         return (u32)(x ^ (x >> 32));
 654 #else
 655         return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
 656                              a->s6_addr32[2] ^ a->s6_addr32[3]);
 657 #endif
 658 }
 659
 660 /* more secured version of ipv6_addr_hash() */
 661 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
 662 {
 663         u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
 664
 665         return jhash_3words(v,
 666                             (__force u32)a->s6_addr32[2],
 667                             (__force u32)a->s6_addr32[3],
 668                             initval);
 669 }
 670
 671 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
 672 {
 673 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 674         const __be64 *be = (const __be64 *)a;
 675
 676         return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
 677 #else
 678         return (a->s6_addr32[0] | a->s6_addr32[1] |
 679                 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
 680 #endif
 681 }
 682
 683 /*
 684  * Note that we must __force cast these to unsigned long to make sparse happy,
 685  * since all of the endian-annotated types are fixed size regardless of arch.
 686  */
 687 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
 688 {
 689         return (
 690 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 691                 *(unsigned long *)a |
 692 #else
 693                 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
 694 #endif
 695                 (__force unsigned long)(a->s6_addr32[2] ^
 696                                         cpu_to_be32(0x0000ffff))) == 0UL;
 697 }
 698
 699 static inline u32 ipv6_portaddr_hash(const struct net *net,
 700                                      const struct in6_addr *addr6,
 701                                      unsigned int port)
 702 {
 703         unsigned int hash, mix = net_hash_mix(net);
 704
 705         if (ipv6_addr_any(addr6))
 706                 hash = jhash_1word(0, mix);
 707         else if (ipv6_addr_v4mapped(addr6))
 708                 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
 709         else
 710                 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
 711
 712         return hash ^ port;
 713 }
 714
 715 /*
 716  * Check for a RFC 4843 ORCHID address
 717  * (Overlay Routable Cryptographic Hash Identifiers)
 718  */
 719 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
 720 {
 721         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
 722 }
 723
 724 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
 725 {
 726         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
 727 }
 728
 729 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
 730                                           struct in6_addr *v4mapped)
 731 {
 732         ipv6_addr_set(v4mapped,
 733                         0, 0,
 734                         htonl(0x0000FFFF),
 735                         addr);
 736 }
 737
 738 /*
 739  * find the first different bit between two addresses
 740  * length of address must be a multiple of 32bits
 741  */
 742 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
 743 {
 744         const __be32 *a1 = token1, *a2 = token2;
 745         int i;
 746
 747         addrlen >>= 2;
 748
 749         for (i = 0; i < addrlen; i++) {
 750                 __be32 xb = a1[i] ^ a2[i];
 751                 if (xb)
 752                         return i * 32 + 31 - __fls(ntohl(xb));
 753         }
 754
 755         /*
 756          *      we should *never* get to this point since that
 757          *      would mean the addrs are equal
 758          *
 759          *      However, we do get to it 8) And exacly, when
 760          *      addresses are equal 8)
 761          *
 762          *      ip route add 1111::/128 via ...
 763          *      ip route add 1111::/64 via ...
 764          *      and we are here.
 765          *
 766          *      Ideally, this function should stop comparison
 767          *      at prefix length. It does not, but it is still OK,
 768          *      if returned value is greater than prefix length.
 769          *                                      --ANK (980803)
 770          */
 771         return addrlen << 5;
 772 }
 773
 774 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 775 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
 776 {
 777         const __be64 *a1 = token1, *a2 = token2;
 778         int i;
 779
 780         addrlen >>= 3;
 781
 782         for (i = 0; i < addrlen; i++) {
 783                 __be64 xb = a1[i] ^ a2[i];
 784                 if (xb)
 785                         return i * 64 + 63 - __fls(be64_to_cpu(xb));
 786         }
 787
 788         return addrlen << 6;
 789 }
 790 #endif
 791
 792 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 793 {
 794 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 795         if (__builtin_constant_p(addrlen) && !(addrlen & 7))
 796                 return __ipv6_addr_diff64(token1, token2, addrlen);
 797 #endif
 798         return __ipv6_addr_diff32(token1, token2, addrlen);
 799 }
 800
 801 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 802 {
 803         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 804 }
 805
 806 __be32 ipv6_select_ident(struct net *net,
 807                          const struct in6_addr *daddr,
 808                          const struct in6_addr *saddr);
 809 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
 810
 811 int ip6_dst_hoplimit(struct dst_entry *dst);
 812
 813 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
 814                                       struct dst_entry *dst)
 815 {
 816         int hlimit;
 817
 818         if (ipv6_addr_is_multicast(&fl6->daddr))
 819                 hlimit = np->mcast_hops;
 820         else
 821                 hlimit = np->hop_limit;
 822         if (hlimit < 0)
 823                 hlimit = ip6_dst_hoplimit(dst);
 824         return hlimit;
 825 }
 826
 827 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
 828  * Equivalent to :      flow->v6addrs.src = iph->saddr;
 829  *                      flow->v6addrs.dst = iph->daddr;
 830  */
 831 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
 832                                             const struct ipv6hdr *iph)
 833 {
 834         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
 835                      offsetof(typeof(flow->addrs), v6addrs.src) +
 836                      sizeof(flow->addrs.v6addrs.src));
 837         memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
 838         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
 839 }
 840
 841 #if IS_ENABLED(CONFIG_IPV6)
 842
 843 static inline bool ipv6_can_nonlocal_bind(struct net *net,
 844                                           struct inet_sock *inet)
 845 {
 846         return net->ipv6.sysctl.ip_nonlocal_bind ||
 847                 inet->freebind || inet->transparent;
 848 }
 849
 850 /* Sysctl settings for net ipv6.auto_flowlabels */
 851 #define IP6_AUTO_FLOW_LABEL_OFF         0
 852 #define IP6_AUTO_FLOW_LABEL_OPTOUT      1
 853 #define IP6_AUTO_FLOW_LABEL_OPTIN       2
 854 #define IP6_AUTO_FLOW_LABEL_FORCED      3
 855
 856 #define IP6_AUTO_FLOW_LABEL_MAX         IP6_AUTO_FLOW_LABEL_FORCED
 857
 858 #define IP6_DEFAULT_AUTO_FLOW_LABELS    IP6_AUTO_FLOW_LABEL_OPTOUT
 859
 860 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
 861                                         __be32 flowlabel, bool autolabel,
 862                                         struct flowi6 *fl6)
 863 {
 864         u32 hash;
 865
 866         /* @flowlabel may include more than a flow label, eg, the traffic class.
 867          * Here we want only the flow label value.
 868          */
 869         flowlabel &= IPV6_FLOWLABEL_MASK;
 870
 871         if (flowlabel ||
 872             net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
 873             (!autolabel &&
 874              net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
 875                 return flowlabel;
 876
 877         hash = skb_get_hash_flowi6(skb, fl6);
 878
 879         /* Since this is being sent on the wire obfuscate hash a bit
 880          * to minimize possbility that any useful information to an
 881          * attacker is leaked. Only lower 20 bits are relevant.
 882          */
 883         hash = rol32(hash, 16);
 884
 885         flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
 886
 887         if (net->ipv6.sysctl.flowlabel_state_ranges)
 888                 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
 889
 890         return flowlabel;
 891 }
 892
 893 static inline int ip6_default_np_autolabel(struct net *net)
 894 {
 895         switch (net->ipv6.sysctl.auto_flowlabels) {
 896         case IP6_AUTO_FLOW_LABEL_OFF:
 897         case IP6_AUTO_FLOW_LABEL_OPTIN:
 898         default:
 899                 return 0;
 900         case IP6_AUTO_FLOW_LABEL_OPTOUT:
 901         case IP6_AUTO_FLOW_LABEL_FORCED:
 902                 return 1;
 903         }
 904 }
 905 #else
 906 static inline void ip6_set_txhash(struct sock *sk) { }
 907 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
 908                                         __be32 flowlabel, bool autolabel,
 909                                         struct flowi6 *fl6)
 910 {
 911         return flowlabel;
 912 }
 913 static inline int ip6_default_np_autolabel(struct net *net)
 914 {
 915         return 0;
 916 }
 917 #endif
 918
 919 #if IS_ENABLED(CONFIG_IPV6)
 920 static inline int ip6_multipath_hash_policy(const struct net *net)
 921 {
 922         return net->ipv6.sysctl.multipath_hash_policy;
 923 }
 924 #else
 925 static inline int ip6_multipath_hash_policy(const struct net *net)
 926 {
 927         return 0;
 928 }
 929 #endif
 930
 931 /*
 932  *      Header manipulation
 933  */
 934 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
 935                                 __be32 flowlabel)
 936 {
 937         *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
 938 }
 939
 940 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
 941 {
 942         return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
 943 }
 944
 945 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
 946 {
 947         return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
 948 }
 949
 950 static inline u8 ip6_tclass(__be32 flowinfo)
 951 {
 952         return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
 953 }
 954
 955 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
 956 {
 957         return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
 958 }
 959
 960 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
 961 {
 962         return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
 963 }
 964
 965 /*
 966  *      Prototypes exported by ipv6
 967  */
 968
 969 /*
 970  *      rcv function (called from netdevice level)
 971  */
 972
 973 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
 974              struct packet_type *pt, struct net_device *orig_dev);
 975 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
 976                    struct net_device *orig_dev);
 977
 978 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 979
 980 /*
 981  *      upper-layer output functions
 982  */
 983 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
 984              __u32 mark, struct ipv6_txoptions *opt, int tclass);
 985
 986 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 987
 988 int ip6_append_data(struct sock *sk,
 989                     int getfrag(void *from, char *to, int offset, int len,
 990                                 int odd, struct sk_buff *skb),
 991                     void *from, int length, int transhdrlen,
 992                     struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
 993                     struct rt6_info *rt, unsigned int flags);
 994
 995 int ip6_push_pending_frames(struct sock *sk);
 996
 997 void ip6_flush_pending_frames(struct sock *sk);
 998
 999 int ip6_send_skb(struct sk_buff *skb);
1000
1001 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1002                                struct inet_cork_full *cork,
1003                                struct inet6_cork *v6_cork);
1004 struct sk_buff *ip6_make_skb(struct sock *sk,
1005                              int getfrag(void *from, char *to, int offset,
1006                                          int len, int odd, struct sk_buff *skb),
1007                              void *from, int length, int transhdrlen,
1008                              struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1009                              struct rt6_info *rt, unsigned int flags,
1010                              struct inet_cork_full *cork);
1011
1012 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1013 {
1014         return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1015                               &inet6_sk(sk)->cork);
1016 }
1017
1018 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1019                    struct flowi6 *fl6);
1020 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
1021                                       const struct in6_addr *final_dst);
1022 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1023                                          const struct in6_addr *final_dst,
1024                                          bool connected);
1025 struct dst_entry *ip6_blackhole_route(struct net *net,
1026                                       struct dst_entry *orig_dst);
1027
1028 /*
1029  *      skb processing functions
1030  */
1031
1032 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1033 int ip6_forward(struct sk_buff *skb);
1034 int ip6_input(struct sk_buff *skb);
1035 int ip6_mc_input(struct sk_buff *skb);
1036 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1037                               bool have_final);
1038
1039 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1040 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1041
1042 /*
1043  *      Extension header (options) processing
1044  */
1045
1046 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1047                           u8 *proto, struct in6_addr **daddr_p,
1048                           struct in6_addr *saddr);
1049 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1050                          u8 *proto);
1051
1052 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1053                      __be16 *frag_offp);
1054
1055 bool ipv6_ext_hdr(u8 nexthdr);
1056
1057 enum {
1058         IP6_FH_F_FRAG           = (1 << 0),
1059         IP6_FH_F_AUTH           = (1 << 1),
1060         IP6_FH_F_SKIP_RH        = (1 << 2),
1061 };
1062
1063 /* find specified header and get offset to it */
1064 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1065                   unsigned short *fragoff, int *fragflg);
1066
1067 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1068
1069 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1070                                 const struct ipv6_txoptions *opt,
1071                                 struct in6_addr *orig);
1072
1073 /*
1074  *      socket options (ipv6_sockglue.c)
1075  */
1076
1077 int ipv6_setsockopt(struct sock *sk, int level, int optname,
1078                     char __user *optval, unsigned int optlen);
1079 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1080                     char __user *optval, int __user *optlen);
1081 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
1082                            char __user *optval, unsigned int optlen);
1083 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
1084                            char __user *optval, int __user *optlen);
1085
1086 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1087                            int addr_len);
1088 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1089 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1090                                  int addr_len);
1091 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1092 void ip6_datagram_release_cb(struct sock *sk);
1093
1094 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1095                     int *addr_len);
1096 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1097                      int *addr_len);
1098 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1099                      u32 info, u8 *payload);
1100 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1101 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1102
1103 int inet6_release(struct socket *sock);
1104 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1105 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1106                   int peer);
1107 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1108
1109 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1110                               struct sock *sk);
1111
1112 /*
1113  * reassembly.c
1114  */
1115 extern const struct proto_ops inet6_stream_ops;
1116 extern const struct proto_ops inet6_dgram_ops;
1117 extern const struct proto_ops inet6_sockraw_ops;
1118
1119 struct group_source_req;
1120 struct group_filter;
1121
1122 int ip6_mc_source(int add, int omode, struct sock *sk,
1123                   struct group_source_req *pgsr);
1124 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1125 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1126                   struct group_filter __user *optval, int __user *optlen);
1127
1128 #ifdef CONFIG_PROC_FS
1129 int ac6_proc_init(struct net *net);
1130 void ac6_proc_exit(struct net *net);
1131 int raw6_proc_init(void);
1132 void raw6_proc_exit(void);
1133 int tcp6_proc_init(struct net *net);
1134 void tcp6_proc_exit(struct net *net);
1135 int udp6_proc_init(struct net *net);
1136 void udp6_proc_exit(struct net *net);
1137 int udplite6_proc_init(void);
1138 void udplite6_proc_exit(void);
1139 int ipv6_misc_proc_init(void);
1140 void ipv6_misc_proc_exit(void);
1141 int snmp6_register_dev(struct inet6_dev *idev);
1142 int snmp6_unregister_dev(struct inet6_dev *idev);
1143
1144 #else
1145 static inline int ac6_proc_init(struct net *net) { return 0; }
1146 static inline void ac6_proc_exit(struct net *net) { }
1147 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1148 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1149 #endif
1150
1151 #ifdef CONFIG_SYSCTL
1152 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1153 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1154 int ipv6_sysctl_register(void);
1155 void ipv6_sysctl_unregister(void);
1156 #endif
1157
1158 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1159                       const struct in6_addr *addr);
1160 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1161                           const struct in6_addr *addr, unsigned int mode);
1162 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1163                       const struct in6_addr *addr);
1164 #endif /* _NET_IPV6_H */