include/net/ipv6.h

   1 /*
   2  *      Linux INET6 implementation
   3  *
   4  *      Authors:
   5  *      Pedro Roque             <roque@di.fc.ul.pt>
   6  *
   7  *      $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _NET_IPV6_H
  16 #define _NET_IPV6_H
  17
  18 #include <linux/ipv6.h>
  19 #include <linux/hardirq.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_ESP             50      /* Encapsulating security payload. */
  39 #define NEXTHDR_AUTH            51      /* Authentication header. */
  40 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
  41 #define NEXTHDR_NONE            59      /* No next header */
  42 #define NEXTHDR_DEST            60      /* Destination options header. */
  43
  44 #define NEXTHDR_MAX             255
  45
  46
  47
  48 #define IPV6_DEFAULT_HOPLIMIT   64
  49 #define IPV6_DEFAULT_MCASTHOPS  1
  50
  51 /*
  52  *      Addr type
  53  *
  54  *      type    -       unicast | multicast
  55  *      scope   -       local   | site      | global
  56  *      v4      -       compat
  57  *      v4mapped
  58  *      any
  59  *      loopback
  60  */
  61
  62 #define IPV6_ADDR_ANY           0x0000U
  63
  64 #define IPV6_ADDR_UNICAST       0x0001U
  65 #define IPV6_ADDR_MULTICAST     0x0002U
  66
  67 #define IPV6_ADDR_LOOPBACK      0x0010U
  68 #define IPV6_ADDR_LINKLOCAL     0x0020U
  69 #define IPV6_ADDR_SITELOCAL     0x0040U
  70
  71 #define IPV6_ADDR_COMPATv4      0x0080U
  72
  73 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
  74
  75 #define IPV6_ADDR_MAPPED        0x1000U
  76 #define IPV6_ADDR_RESERVED      0x2000U /* reserved address space */
  77
  78 /*
  79  *      Addr scopes
  80  */
  81 #ifdef __KERNEL__
  82 #define IPV6_ADDR_MC_SCOPE(a)   \
  83         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
  84 #define __IPV6_ADDR_SCOPE_INVALID       -1
  85 #endif
  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  *      fragmentation header
  94  */
  95
  96 struct frag_hdr {
  97         unsigned char   nexthdr;
  98         unsigned char   reserved;
  99         unsigned short  frag_off;
 100         __u32           identification;
 101 };
 102
 103 #define IP6_MF  0x0001
 104
 105 #ifdef __KERNEL__
 106
 107 #include <net/sock.h>
 108
 109 /* sysctls */
 110 extern int sysctl_ipv6_bindv6only;
 111 extern int sysctl_mld_max_msf;
 112
 113 /* MIBs */
 114 DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
 115 #define IP6_INC_STATS(field)            SNMP_INC_STATS(ipv6_statistics, field)
 116 #define IP6_INC_STATS_BH(field)         SNMP_INC_STATS_BH(ipv6_statistics, field)
 117 #define IP6_INC_STATS_USER(field)       SNMP_INC_STATS_USER(ipv6_statistics, field)
 118 DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
 119 #define ICMP6_INC_STATS(idev, field)            ({                      \
 120         struct inet6_dev *_idev = (idev);                               \
 121         if (likely(_idev != NULL))                                      \
 122                 SNMP_INC_STATS(idev->stats.icmpv6, field);              \
 123         SNMP_INC_STATS(icmpv6_statistics, field);                       \
 124 })
 125 #define ICMP6_INC_STATS_BH(idev, field)         ({                      \
 126         struct inet6_dev *_idev = (idev);                               \
 127         if (likely(_idev != NULL))                                      \
 128                 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field);        \
 129         SNMP_INC_STATS_BH(icmpv6_statistics, field);                    \
 130 })
 131 #define ICMP6_INC_STATS_USER(idev, field)       ({                      \
 132         struct inet6_dev *_idev = (idev);                               \
 133         if (likely(_idev != NULL))                                      \
 134                 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field);        \
 135         SNMP_INC_STATS_USER(icmpv6_statistics, field);                  \
 136 })
 137 #define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset)  ({                      \
 138         struct inet6_dev *_idev = idev;                                         \
 139         __typeof__(offset) _offset = (offset);                                  \
 140         if (likely(_idev != NULL))                                              \
 141                 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset);  \
 142         SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset);            \
 143 })
 144 DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
 145 #define UDP6_INC_STATS(field)           SNMP_INC_STATS(udp_stats_in6, field)
 146 #define UDP6_INC_STATS_BH(field)        SNMP_INC_STATS_BH(udp_stats_in6, field)
 147 #define UDP6_INC_STATS_USER(field)      SNMP_INC_STATS_USER(udp_stats_in6, field)
 148
 149 int snmp6_register_dev(struct inet6_dev *idev);
 150 int snmp6_unregister_dev(struct inet6_dev *idev);
 151 int snmp6_alloc_dev(struct inet6_dev *idev);
 152 int snmp6_free_dev(struct inet6_dev *idev);
 153 int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
 154 void snmp6_mib_free(void *ptr[2]);
 155
 156 struct ip6_ra_chain
 157 {
 158         struct ip6_ra_chain     *next;
 159         struct sock             *sk;
 160         int                     sel;
 161         void                    (*destructor)(struct sock *);
 162 };
 163
 164 extern struct ip6_ra_chain      *ip6_ra_chain;
 165 extern rwlock_t ip6_ra_lock;
 166
 167 /*
 168    This structure is prepared by protocol, when parsing
 169    ancillary data and passed to IPv6.
 170  */
 171
 172 struct ipv6_txoptions
 173 {
 174         /* Length of this structure */
 175         int                     tot_len;
 176
 177         /* length of extension headers   */
 178
 179         __u16                   opt_flen;       /* after fragment hdr */
 180         __u16                   opt_nflen;      /* before fragment hdr */
 181
 182         struct ipv6_opt_hdr     *hopopt;
 183         struct ipv6_opt_hdr     *dst0opt;
 184         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
 185         struct ipv6_opt_hdr     *dst1opt;
 186
 187         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
 188 };
 189
 190 struct ip6_flowlabel
 191 {
 192         struct ip6_flowlabel    *next;
 193         u32                     label;
 194         struct in6_addr         dst;
 195         struct ipv6_txoptions   *opt;
 196         atomic_t                users;
 197         unsigned long           linger;
 198         u8                      share;
 199         u32                     owner;
 200         unsigned long           lastuse;
 201         unsigned long           expires;
 202 };
 203
 204 #define IPV6_FLOWINFO_MASK      __constant_htonl(0x0FFFFFFF)
 205 #define IPV6_FLOWLABEL_MASK     __constant_htonl(0x000FFFFF)
 206
 207 struct ipv6_fl_socklist
 208 {
 209         struct ipv6_fl_socklist *next;
 210         struct ip6_flowlabel    *fl;
 211 };
 212
 213 extern struct ip6_flowlabel     *fl6_sock_lookup(struct sock *sk, u32 label);
 214 extern struct ipv6_txoptions    *fl6_merge_options(struct ipv6_txoptions * opt_space,
 215                                                    struct ip6_flowlabel * fl,
 216                                                    struct ipv6_txoptions * fopt);
 217 extern void                     fl6_free_socklist(struct sock *sk);
 218 extern int                      ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
 219 extern void                     ip6_flowlabel_init(void);
 220 extern void                     ip6_flowlabel_cleanup(void);
 221
 222 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
 223 {
 224         if (fl)
 225                 atomic_dec(&fl->users);
 226 }
 227
 228 extern int                      ip6_ra_control(struct sock *sk, int sel,
 229                                                void (*destructor)(struct sock *));
 230
 231
 232 extern int                      ipv6_parse_hopopts(struct sk_buff *skb);
 233
 234 extern struct ipv6_txoptions *  ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
 235 extern struct ipv6_txoptions *  ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
 236                                                    int newtype,
 237                                                    struct ipv6_opt_hdr __user *newopt,
 238                                                    int newoptlen);
 239 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
 240                                           struct ipv6_txoptions *opt);
 241
 242 extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
 243
 244 extern int ip6_frag_nqueues;
 245 extern atomic_t ip6_frag_mem;
 246
 247 #define IPV6_FRAG_TIMEOUT       (60*HZ)         /* 60 seconds */
 248
 249 /*
 250  *      Function prototype for build_xmit
 251  */
 252
 253 typedef int             (*inet_getfrag_t) (const void *data,
 254                                            struct in6_addr *addr,
 255                                            char *,
 256                                            unsigned int, unsigned int);
 257
 258 extern int __ipv6_addr_type(const struct in6_addr *addr);
 259 static inline int ipv6_addr_type(const struct in6_addr *addr)
 260 {
 261         return __ipv6_addr_type(addr) & 0xffff;
 262 }
 263
 264 static inline int ipv6_addr_scope(const struct in6_addr *addr)
 265 {
 266         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
 267 }
 268
 269 static inline int __ipv6_addr_src_scope(int type)
 270 {
 271         return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
 272 }
 273
 274 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 275 {
 276         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 277 }
 278
 279 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 280 {
 281         return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
 282 }
 283
 284 static inline int
 285 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
 286                      const struct in6_addr *a2)
 287 {
 288         unsigned int i;
 289
 290         for (i = 0; i < 4; i++)
 291                 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
 292                         return 1;
 293         return 0;
 294 }
 295
 296 static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
 297 {
 298         memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
 299 }
 300
 301 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
 302                                     const struct in6_addr *addr,
 303                                     int plen)
 304 {
 305         /* caller must guarantee 0 <= plen <= 128 */
 306         int o = plen >> 3,
 307             b = plen & 0x7;
 308
 309         memcpy(pfx->s6_addr, addr, o);
 310         if (b != 0) {
 311                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
 312                 o++;
 313         }
 314         if (o < 16)
 315                 memset(pfx->s6_addr + o, 0, 16 - o);
 316 }
 317
 318 #ifndef __HAVE_ARCH_ADDR_SET
 319 static inline void ipv6_addr_set(struct in6_addr *addr,
 320                                      __u32 w1, __u32 w2,
 321                                      __u32 w3, __u32 w4)
 322 {
 323         addr->s6_addr32[0] = w1;
 324         addr->s6_addr32[1] = w2;
 325         addr->s6_addr32[2] = w3;
 326         addr->s6_addr32[3] = w4;
 327 }
 328 #endif
 329
 330 static inline int ipv6_addr_equal(const struct in6_addr *a1,
 331                                   const struct in6_addr *a2)
 332 {
 333         return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
 334                 a1->s6_addr32[1] == a2->s6_addr32[1] &&
 335                 a1->s6_addr32[2] == a2->s6_addr32[2] &&
 336                 a1->s6_addr32[3] == a2->s6_addr32[3]);
 337 }
 338
 339 static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
 340                                       unsigned int prefixlen)
 341 {
 342         unsigned pdw, pbi;
 343
 344         /* check complete u32 in prefix */
 345         pdw = prefixlen >> 5;
 346         if (pdw && memcmp(a1, a2, pdw << 2))
 347                 return 0;
 348
 349         /* check incomplete u32 in prefix */
 350         pbi = prefixlen & 0x1f;
 351         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
 352                 return 0;
 353
 354         return 1;
 355 }
 356
 357 static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 358                                     const struct in6_addr *a2,
 359                                     unsigned int prefixlen)
 360 {
 361         return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
 362                                    prefixlen);
 363 }
 364
 365 static inline int ipv6_addr_any(const struct in6_addr *a)
 366 {
 367         return ((a->s6_addr32[0] | a->s6_addr32[1] |
 368                  a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
 369 }
 370
 371 /*
 372  * find the first different bit between two addresses
 373  * length of address must be a multiple of 32bits
 374  */
 375 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
 376 {
 377         const __u32 *a1 = token1, *a2 = token2;
 378         int i;
 379
 380         addrlen >>= 2;
 381
 382         for (i = 0; i < addrlen; i++) {
 383                 __u32 xb = a1[i] ^ a2[i];
 384                 if (xb) {
 385                         int j = 31;
 386
 387                         xb = ntohl(xb);
 388                         while ((xb & (1 << j)) == 0)
 389                                 j--;
 390
 391                         return (i * 32 + 31 - j);
 392                 }
 393         }
 394
 395         /*
 396          *      we should *never* get to this point since that
 397          *      would mean the addrs are equal
 398          *
 399          *      However, we do get to it 8) And exacly, when
 400          *      addresses are equal 8)
 401          *
 402          *      ip route add 1111::/128 via ...
 403          *      ip route add 1111::/64 via ...
 404          *      and we are here.
 405          *
 406          *      Ideally, this function should stop comparison
 407          *      at prefix length. It does not, but it is still OK,
 408          *      if returned value is greater than prefix length.
 409          *                                      --ANK (980803)
 410          */
 411         return (addrlen << 5);
 412 }
 413
 414 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
 415 {
 416         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
 417 }
 418
 419 /*
 420  *      Prototypes exported by ipv6
 421  */
 422
 423 /*
 424  *      rcv function (called from netdevice level)
 425  */
 426
 427 extern int                      ipv6_rcv(struct sk_buff *skb,
 428                                          struct net_device *dev,
 429                                          struct packet_type *pt,
 430                                          struct net_device *orig_dev);
 431
 432 extern int                      ip6_rcv_finish(struct sk_buff *skb);
 433
 434 /*
 435  *      upper-layer output functions
 436  */
 437 extern int                      ip6_xmit(struct sock *sk,
 438                                          struct sk_buff *skb,
 439                                          struct flowi *fl,
 440                                          struct ipv6_txoptions *opt,
 441                                          int ipfragok);
 442
 443 extern int                      ip6_nd_hdr(struct sock *sk,
 444                                            struct sk_buff *skb,
 445                                            struct net_device *dev,
 446                                            struct in6_addr *saddr,
 447                                            struct in6_addr *daddr,
 448                                            int proto, int len);
 449
 450 extern int                      ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
 451
 452 extern int                      ip6_append_data(struct sock *sk,
 453                                                 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
 454                                                 void *from,
 455                                                 int length,
 456                                                 int transhdrlen,
 457                                                 int hlimit,
 458                                                 int tclass,
 459                                                 struct ipv6_txoptions *opt,
 460                                                 struct flowi *fl,
 461                                                 struct rt6_info *rt,
 462                                                 unsigned int flags);
 463
 464 extern int                      ip6_push_pending_frames(struct sock *sk);
 465
 466 extern void                     ip6_flush_pending_frames(struct sock *sk);
 467
 468 extern int                      ip6_dst_lookup(struct sock *sk,
 469                                                struct dst_entry **dst,
 470                                                struct flowi *fl);
 471
 472 /*
 473  *      skb processing functions
 474  */
 475
 476 extern int                      ip6_output(struct sk_buff *skb);
 477 extern int                      ip6_forward(struct sk_buff *skb);
 478 extern int                      ip6_input(struct sk_buff *skb);
 479 extern int                      ip6_mc_input(struct sk_buff *skb);
 480
 481 /*
 482  *      Extension header (options) processing
 483  */
 484
 485 extern u8 *                     ipv6_build_nfrag_opts(struct sk_buff *skb,
 486                                                       u8 *prev_hdr,
 487                                                       struct ipv6_txoptions *opt,
 488                                                       struct in6_addr *daddr,
 489                                                       u32 jumbolen);
 490 extern u8 *                     ipv6_build_frag_opts(struct sk_buff *skb,
 491                                                      u8 *prev_hdr,
 492                                                      struct ipv6_txoptions *opt);
 493 extern void                     ipv6_push_nfrag_opts(struct sk_buff *skb,
 494                                                      struct ipv6_txoptions *opt,
 495                                                      u8 *proto,
 496                                                      struct in6_addr **daddr_p);
 497 extern void                     ipv6_push_frag_opts(struct sk_buff *skb,
 498                                                     struct ipv6_txoptions *opt,
 499                                                     u8 *proto);
 500
 501 extern int                      ipv6_skip_exthdr(const struct sk_buff *, int start,
 502                                                  u8 *nexthdrp);
 503
 504 extern int                      ipv6_ext_hdr(u8 nexthdr);
 505
 506 extern struct ipv6_txoptions *  ipv6_invert_rthdr(struct sock *sk,
 507                                                   struct ipv6_rt_hdr *hdr);
 508
 509
 510 /*
 511  *      socket options (ipv6_sockglue.c)
 512  */
 513
 514 extern int                      ipv6_setsockopt(struct sock *sk, int level,
 515                                                 int optname,
 516                                                 char __user *optval,
 517                                                 int optlen);
 518 extern int                      ipv6_getsockopt(struct sock *sk, int level,
 519                                                 int optname,
 520                                                 char __user *optval,
 521                                                 int __user *optlen);
 522 extern int                      compat_ipv6_setsockopt(struct sock *sk,
 523                                                 int level,
 524                                                 int optname,
 525                                                 char __user *optval,
 526                                                 int optlen);
 527 extern int                      compat_ipv6_getsockopt(struct sock *sk,
 528                                                 int level,
 529                                                 int optname,
 530                                                 char __user *optval,
 531                                                 int __user *optlen);
 532
 533 extern void                     ipv6_packet_init(void);
 534
 535 extern void                     ipv6_packet_cleanup(void);
 536
 537 extern int                      ip6_datagram_connect(struct sock *sk,
 538                                                      struct sockaddr *addr, int addr_len);
 539
 540 extern int                      ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
 541 extern void                     ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
 542                                                 u32 info, u8 *payload);
 543 extern void                     ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
 544
 545 extern int inet6_release(struct socket *sock);
 546 extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
 547                       int addr_len);
 548 extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 549                          int *uaddr_len, int peer);
 550 extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
 551                        unsigned long arg);
 552
 553 extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
 554                               struct sock *sk);
 555
 556 /*
 557  * reassembly.c
 558  */
 559 extern int sysctl_ip6frag_high_thresh;
 560 extern int sysctl_ip6frag_low_thresh;
 561 extern int sysctl_ip6frag_time;
 562 extern int sysctl_ip6frag_secret_interval;
 563
 564 extern const struct proto_ops inet6_stream_ops;
 565 extern const struct proto_ops inet6_dgram_ops;
 566
 567 struct group_source_req;
 568 struct group_filter;
 569
 570 extern int ip6_mc_source(int add, int omode, struct sock *sk,
 571                          struct group_source_req *pgsr);
 572 extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
 573 extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 574                          struct group_filter __user *optval,
 575                          int __user *optlen);
 576
 577 #ifdef CONFIG_PROC_FS
 578 extern int  ac6_proc_init(void);
 579 extern void ac6_proc_exit(void);
 580 extern int  raw6_proc_init(void);
 581 extern void raw6_proc_exit(void);
 582 extern int  tcp6_proc_init(void);
 583 extern void tcp6_proc_exit(void);
 584 extern int  udp6_proc_init(void);
 585 extern void udp6_proc_exit(void);
 586 extern int  ipv6_misc_proc_init(void);
 587 extern void ipv6_misc_proc_exit(void);
 588
 589 extern struct rt6_statistics rt6_stats;
 590 #endif
 591
 592 #ifdef CONFIG_SYSCTL
 593 extern ctl_table ipv6_route_table[];
 594 extern ctl_table ipv6_icmp_table[];
 595
 596 extern void ipv6_sysctl_register(void);
 597 extern void ipv6_sysctl_unregister(void);
 598 #endif
 599
 600 #endif /* __KERNEL__ */
 601 #endif /* _NET_IPV6_H */