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TOMOYO Linux Cross Reference
Linux/include/net/ipv6.h

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  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/flow_dissector.h>
 23 #include <net/snmp.h>
 24 
 25 #define SIN6_LEN_RFC2133        24
 26 
 27 #define IPV6_MAXPLEN            65535
 28 
 29 /*
 30  *      NextHeader field of IPv6 header
 31  */
 32 
 33 #define NEXTHDR_HOP             0       /* Hop-by-hop option header. */
 34 #define NEXTHDR_TCP             6       /* TCP segment. */
 35 #define NEXTHDR_UDP             17      /* UDP message. */
 36 #define NEXTHDR_IPV6            41      /* IPv6 in IPv6 */
 37 #define NEXTHDR_ROUTING         43      /* Routing header. */
 38 #define NEXTHDR_FRAGMENT        44      /* Fragmentation/reassembly header. */
 39 #define NEXTHDR_GRE             47      /* GRE header. */
 40 #define NEXTHDR_ESP             50      /* Encapsulating security payload. */
 41 #define NEXTHDR_AUTH            51      /* Authentication header. */
 42 #define NEXTHDR_ICMP            58      /* ICMP for IPv6. */
 43 #define NEXTHDR_NONE            59      /* No next header */
 44 #define NEXTHDR_DEST            60      /* Destination options header. */
 45 #define NEXTHDR_SCTP            132     /* SCTP message. */
 46 #define NEXTHDR_MOBILITY        135     /* Mobility header. */
 47 
 48 #define NEXTHDR_MAX             255
 49 
 50 #define IPV6_DEFAULT_HOPLIMIT   64
 51 #define IPV6_DEFAULT_MCASTHOPS  1
 52 
 53 /*
 54  *      Addr type
 55  *      
 56  *      type    -       unicast | multicast
 57  *      scope   -       local   | site      | global
 58  *      v4      -       compat
 59  *      v4mapped
 60  *      any
 61  *      loopback
 62  */
 63 
 64 #define IPV6_ADDR_ANY           0x0000U
 65 
 66 #define IPV6_ADDR_UNICAST       0x0001U 
 67 #define IPV6_ADDR_MULTICAST     0x0002U 
 68 
 69 #define IPV6_ADDR_LOOPBACK      0x0010U
 70 #define IPV6_ADDR_LINKLOCAL     0x0020U
 71 #define IPV6_ADDR_SITELOCAL     0x0040U
 72 
 73 #define IPV6_ADDR_COMPATv4      0x0080U
 74 
 75 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
 76 
 77 #define IPV6_ADDR_MAPPED        0x1000U
 78 
 79 /*
 80  *      Addr scopes
 81  */
 82 #define IPV6_ADDR_MC_SCOPE(a)   \
 83         ((a)->s6_addr[1] & 0x0f)        /* nonstandard */
 84 #define __IPV6_ADDR_SCOPE_INVALID       -1
 85 #define IPV6_ADDR_SCOPE_NODELOCAL       0x01
 86 #define IPV6_ADDR_SCOPE_LINKLOCAL       0x02
 87 #define IPV6_ADDR_SCOPE_SITELOCAL       0x05
 88 #define IPV6_ADDR_SCOPE_ORGLOCAL        0x08
 89 #define IPV6_ADDR_SCOPE_GLOBAL          0x0e
 90 
 91 /*
 92  *      Addr flags
 93  */
 94 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
 95         ((a)->s6_addr[1] & 0x10)
 96 #define IPV6_ADDR_MC_FLAG_PREFIX(a)     \
 97         ((a)->s6_addr[1] & 0x20)
 98 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
 99         ((a)->s6_addr[1] & 0x40)
100 
101 /*
102  *      fragmentation header
103  */
104 
105 struct frag_hdr {
106         __u8    nexthdr;
107         __u8    reserved;
108         __be16  frag_off;
109         __be32  identification;
110 };
111 
112 #define IP6_MF          0x0001
113 #define IP6_OFFSET      0xFFF8
114 
115 #define IP6_REPLY_MARK(net, mark) \
116         ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
117 
118 #include <net/sock.h>
119 
120 /* sysctls */
121 extern int sysctl_mld_max_msf;
122 extern int sysctl_mld_qrv;
123 
124 #define _DEVINC(net, statname, mod, idev, field)                        \
125 ({                                                                      \
126         struct inet6_dev *_idev = (idev);                               \
127         if (likely(_idev != NULL))                                      \
128                 mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
129         mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
130 })
131 
132 /* per device counters are atomic_long_t */
133 #define _DEVINCATOMIC(net, statname, mod, idev, field)                  \
134 ({                                                                      \
135         struct inet6_dev *_idev = (idev);                               \
136         if (likely(_idev != NULL))                                      \
137                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
138         mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
139 })
140 
141 /* per device and per net counters are atomic_long_t */
142 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)               \
143 ({                                                                      \
144         struct inet6_dev *_idev = (idev);                               \
145         if (likely(_idev != NULL))                                      \
146                 SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
147         SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
148 })
149 
150 #define _DEVADD(net, statname, mod, idev, field, val)                   \
151 ({                                                                      \
152         struct inet6_dev *_idev = (idev);                               \
153         if (likely(_idev != NULL))                                      \
154                 mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
155         mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
156 })
157 
158 #define _DEVUPD(net, statname, mod, idev, field, val)                   \
159 ({                                                                      \
160         struct inet6_dev *_idev = (idev);                               \
161         if (likely(_idev != NULL))                                      \
162                 mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
163         mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
164 })
165 
166 /* MIBs */
167 
168 #define IP6_INC_STATS(net, idev,field)          \
169                 _DEVINC(net, ipv6, , idev, field)
170 #define __IP6_INC_STATS(net, idev,field)        \
171                 _DEVINC(net, ipv6, __, idev, field)
172 #define IP6_ADD_STATS(net, idev,field,val)      \
173                 _DEVADD(net, ipv6, , idev, field, val)
174 #define __IP6_ADD_STATS(net, idev,field,val)    \
175                 _DEVADD(net, ipv6, __, idev, field, val)
176 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
177                 _DEVUPD(net, ipv6, , idev, field, val)
178 #define __IP6_UPD_PO_STATS(net, idev,field,val)   \
179                 _DEVUPD(net, ipv6, __, idev, field, val)
180 #define ICMP6_INC_STATS(net, idev, field)       \
181                 _DEVINCATOMIC(net, icmpv6, , idev, field)
182 #define __ICMP6_INC_STATS(net, idev, field)     \
183                 _DEVINCATOMIC(net, icmpv6, __, idev, field)
184 
185 #define ICMP6MSGOUT_INC_STATS(net, idev, field)         \
186         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
187 #define ICMP6MSGIN_INC_STATS(net, idev, field)  \
188         _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
189 
190 struct ip6_ra_chain {
191         struct ip6_ra_chain     *next;
192         struct sock             *sk;
193         int                     sel;
194         void                    (*destructor)(struct sock *);
195 };
196 
197 extern struct ip6_ra_chain      *ip6_ra_chain;
198 extern rwlock_t ip6_ra_lock;
199 
200 /*
201    This structure is prepared by protocol, when parsing
202    ancillary data and passed to IPv6.
203  */
204 
205 struct ipv6_txoptions {
206         atomic_t                refcnt;
207         /* Length of this structure */
208         int                     tot_len;
209 
210         /* length of extension headers   */
211 
212         __u16                   opt_flen;       /* after fragment hdr */
213         __u16                   opt_nflen;      /* before fragment hdr */
214 
215         struct ipv6_opt_hdr     *hopopt;
216         struct ipv6_opt_hdr     *dst0opt;
217         struct ipv6_rt_hdr      *srcrt; /* Routing Header */
218         struct ipv6_opt_hdr     *dst1opt;
219         struct rcu_head         rcu;
220         /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
221 };
222 
223 struct ip6_flowlabel {
224         struct ip6_flowlabel __rcu *next;
225         __be32                  label;
226         atomic_t                users;
227         struct in6_addr         dst;
228         struct ipv6_txoptions   *opt;
229         unsigned long           linger;
230         struct rcu_head         rcu;
231         u8                      share;
232         union {
233                 struct pid *pid;
234                 kuid_t uid;
235         } owner;
236         unsigned long           lastuse;
237         unsigned long           expires;
238         struct net              *fl_net;
239 };
240 
241 #define IPV6_FLOWINFO_MASK              cpu_to_be32(0x0FFFFFFF)
242 #define IPV6_FLOWLABEL_MASK             cpu_to_be32(0x000FFFFF)
243 #define IPV6_FLOWLABEL_STATELESS_FLAG   cpu_to_be32(0x00080000)
244 
245 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
246 #define IPV6_TCLASS_SHIFT       20
247 
248 struct ipv6_fl_socklist {
249         struct ipv6_fl_socklist __rcu   *next;
250         struct ip6_flowlabel            *fl;
251         struct rcu_head                 rcu;
252 };
253 
254 struct ipcm6_cookie {
255         __s16 hlimit;
256         __s16 tclass;
257         __s8  dontfrag;
258         struct ipv6_txoptions *opt;
259 };
260 
261 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
262 {
263         struct ipv6_txoptions *opt;
264 
265         rcu_read_lock();
266         opt = rcu_dereference(np->opt);
267         if (opt) {
268                 if (!atomic_inc_not_zero(&opt->refcnt))
269                         opt = NULL;
270                 else
271                         opt = rcu_pointer_handoff(opt);
272         }
273         rcu_read_unlock();
274         return opt;
275 }
276 
277 static inline void txopt_put(struct ipv6_txoptions *opt)
278 {
279         if (opt && atomic_dec_and_test(&opt->refcnt))
280                 kfree_rcu(opt, rcu);
281 }
282 
283 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
284 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
285                                          struct ip6_flowlabel *fl,
286                                          struct ipv6_txoptions *fopt);
287 void fl6_free_socklist(struct sock *sk);
288 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
289 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
290                            int flags);
291 int ip6_flowlabel_init(void);
292 void ip6_flowlabel_cleanup(void);
293 
294 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
295 {
296         if (fl)
297                 atomic_dec(&fl->users);
298 }
299 
300 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
301 
302 int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
303                                struct icmp6hdr *thdr, int len);
304 
305 int ip6_ra_control(struct sock *sk, int sel);
306 
307 int ipv6_parse_hopopts(struct sk_buff *skb);
308 
309 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
310                                         struct ipv6_txoptions *opt);
311 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
312                                           struct ipv6_txoptions *opt,
313                                           int newtype,
314                                           struct ipv6_opt_hdr __user *newopt,
315                                           int newoptlen);
316 struct ipv6_txoptions *
317 ipv6_renew_options_kern(struct sock *sk,
318                         struct ipv6_txoptions *opt,
319                         int newtype,
320                         struct ipv6_opt_hdr *newopt,
321                         int newoptlen);
322 struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
323                                           struct ipv6_txoptions *opt);
324 
325 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
326                        const struct inet6_skb_parm *opt);
327 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
328                                            struct ipv6_txoptions *opt);
329 
330 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
331 {
332         /* If forwarding is enabled, RA are not accepted unless the special
333          * hybrid mode (accept_ra=2) is enabled.
334          */
335         return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
336             idev->cnf.accept_ra;
337 }
338 
339 #if IS_ENABLED(CONFIG_IPV6)
340 static inline int ip6_frag_mem(struct net *net)
341 {
342         return sum_frag_mem_limit(&net->ipv6.frags);
343 }
344 #endif
345 
346 #define IPV6_FRAG_HIGH_THRESH   (4 * 1024*1024) /* 4194304 */
347 #define IPV6_FRAG_LOW_THRESH    (3 * 1024*1024) /* 3145728 */
348 #define IPV6_FRAG_TIMEOUT       (60 * HZ)       /* 60 seconds */
349 
350 int __ipv6_addr_type(const struct in6_addr *addr);
351 static inline int ipv6_addr_type(const struct in6_addr *addr)
352 {
353         return __ipv6_addr_type(addr) & 0xffff;
354 }
355 
356 static inline int ipv6_addr_scope(const struct in6_addr *addr)
357 {
358         return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
359 }
360 
361 static inline int __ipv6_addr_src_scope(int type)
362 {
363         return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
364 }
365 
366 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
367 {
368         return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
369 }
370 
371 static inline bool __ipv6_addr_needs_scope_id(int type)
372 {
373         return type & IPV6_ADDR_LINKLOCAL ||
374                (type & IPV6_ADDR_MULTICAST &&
375                 (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
376 }
377 
378 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
379 {
380         return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
381 }
382 
383 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
384 {
385         return memcmp(a1, a2, sizeof(struct in6_addr));
386 }
387 
388 static inline bool
389 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
390                      const struct in6_addr *a2)
391 {
392 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
393         const unsigned long *ul1 = (const unsigned long *)a1;
394         const unsigned long *ulm = (const unsigned long *)m;
395         const unsigned long *ul2 = (const unsigned long *)a2;
396 
397         return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
398                   ((ul1[1] ^ ul2[1]) & ulm[1]));
399 #else
400         return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
401                   ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
402                   ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
403                   ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
404 #endif
405 }
406 
407 static inline void ipv6_addr_prefix(struct in6_addr *pfx, 
408                                     const struct in6_addr *addr,
409                                     int plen)
410 {
411         /* caller must guarantee 0 <= plen <= 128 */
412         int o = plen >> 3,
413             b = plen & 0x7;
414 
415         memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
416         memcpy(pfx->s6_addr, addr, o);
417         if (b != 0)
418                 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
419 }
420 
421 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
422                                          const struct in6_addr *pfx,
423                                          int plen)
424 {
425         /* caller must guarantee 0 <= plen <= 128 */
426         int o = plen >> 3,
427             b = plen & 0x7;
428 
429         memcpy(addr->s6_addr, pfx, o);
430         if (b != 0) {
431                 addr->s6_addr[o] &= ~(0xff00 >> b);
432                 addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
433         }
434 }
435 
436 static inline void __ipv6_addr_set_half(__be32 *addr,
437                                         __be32 wh, __be32 wl)
438 {
439 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
440 #if defined(__BIG_ENDIAN)
441         if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
442                 *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
443                 return;
444         }
445 #elif defined(__LITTLE_ENDIAN)
446         if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
447                 *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
448                 return;
449         }
450 #endif
451 #endif
452         addr[0] = wh;
453         addr[1] = wl;
454 }
455 
456 static inline void ipv6_addr_set(struct in6_addr *addr, 
457                                      __be32 w1, __be32 w2,
458                                      __be32 w3, __be32 w4)
459 {
460         __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
461         __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
462 }
463 
464 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
465                                    const struct in6_addr *a2)
466 {
467 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
468         const unsigned long *ul1 = (const unsigned long *)a1;
469         const unsigned long *ul2 = (const unsigned long *)a2;
470 
471         return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
472 #else
473         return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
474                 (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
475                 (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
476                 (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
477 #endif
478 }
479 
480 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
481 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
482                                               const __be64 *a2,
483                                               unsigned int len)
484 {
485         if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
486                 return false;
487         return true;
488 }
489 
490 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
491                                      const struct in6_addr *addr2,
492                                      unsigned int prefixlen)
493 {
494         const __be64 *a1 = (const __be64 *)addr1;
495         const __be64 *a2 = (const __be64 *)addr2;
496 
497         if (prefixlen >= 64) {
498                 if (a1[0] ^ a2[0])
499                         return false;
500                 return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
501         }
502         return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
503 }
504 #else
505 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
506                                      const struct in6_addr *addr2,
507                                      unsigned int prefixlen)
508 {
509         const __be32 *a1 = addr1->s6_addr32;
510         const __be32 *a2 = addr2->s6_addr32;
511         unsigned int pdw, pbi;
512 
513         /* check complete u32 in prefix */
514         pdw = prefixlen >> 5;
515         if (pdw && memcmp(a1, a2, pdw << 2))
516                 return false;
517 
518         /* check incomplete u32 in prefix */
519         pbi = prefixlen & 0x1f;
520         if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
521                 return false;
522 
523         return true;
524 }
525 #endif
526 
527 struct inet_frag_queue;
528 
529 enum ip6_defrag_users {
530         IP6_DEFRAG_LOCAL_DELIVER,
531         IP6_DEFRAG_CONNTRACK_IN,
532         __IP6_DEFRAG_CONNTRACK_IN       = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
533         IP6_DEFRAG_CONNTRACK_OUT,
534         __IP6_DEFRAG_CONNTRACK_OUT      = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
535         IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
536         __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
537 };
538 
539 struct ip6_create_arg {
540         __be32 id;
541         u32 user;
542         const struct in6_addr *src;
543         const struct in6_addr *dst;
544         int iif;
545         u8 ecn;
546 };
547 
548 void ip6_frag_init(struct inet_frag_queue *q, const void *a);
549 bool ip6_frag_match(const struct inet_frag_queue *q, const void *a);
550 
551 /*
552  *      Equivalent of ipv4 struct ip
553  */
554 struct frag_queue {
555         struct inet_frag_queue  q;
556 
557         __be32                  id;             /* fragment id          */
558         u32                     user;
559         struct in6_addr         saddr;
560         struct in6_addr         daddr;
561 
562         int                     iif;
563         unsigned int            csum;
564         __u16                   nhoffset;
565         u8                      ecn;
566 };
567 
568 void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
569                            struct inet_frags *frags);
570 
571 static inline bool ipv6_addr_any(const struct in6_addr *a)
572 {
573 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
574         const unsigned long *ul = (const unsigned long *)a;
575 
576         return (ul[0] | ul[1]) == 0UL;
577 #else
578         return (a->s6_addr32[0] | a->s6_addr32[1] |
579                 a->s6_addr32[2] | a->s6_addr32[3]) == 0;
580 #endif
581 }
582 
583 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
584 {
585 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
586         const unsigned long *ul = (const unsigned long *)a;
587         unsigned long x = ul[0] ^ ul[1];
588 
589         return (u32)(x ^ (x >> 32));
590 #else
591         return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
592                              a->s6_addr32[2] ^ a->s6_addr32[3]);
593 #endif
594 }
595 
596 /* more secured version of ipv6_addr_hash() */
597 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
598 {
599         u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
600 
601         return jhash_3words(v,
602                             (__force u32)a->s6_addr32[2],
603                             (__force u32)a->s6_addr32[3],
604                             initval);
605 }
606 
607 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
608 {
609 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
610         const __be64 *be = (const __be64 *)a;
611 
612         return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
613 #else
614         return (a->s6_addr32[0] | a->s6_addr32[1] |
615                 a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
616 #endif
617 }
618 
619 /*
620  * Note that we must __force cast these to unsigned long to make sparse happy,
621  * since all of the endian-annotated types are fixed size regardless of arch.
622  */
623 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
624 {
625         return (
626 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
627                 *(unsigned long *)a |
628 #else
629                 (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
630 #endif
631                 (__force unsigned long)(a->s6_addr32[2] ^
632                                         cpu_to_be32(0x0000ffff))) == 0UL;
633 }
634 
635 /*
636  * Check for a RFC 4843 ORCHID address
637  * (Overlay Routable Cryptographic Hash Identifiers)
638  */
639 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
640 {
641         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
642 }
643 
644 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
645 {
646         return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
647 }
648 
649 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
650                                           struct in6_addr *v4mapped)
651 {
652         ipv6_addr_set(v4mapped,
653                         0, 0,
654                         htonl(0x0000FFFF),
655                         addr);
656 }
657 
658 /*
659  * find the first different bit between two addresses
660  * length of address must be a multiple of 32bits
661  */
662 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
663 {
664         const __be32 *a1 = token1, *a2 = token2;
665         int i;
666 
667         addrlen >>= 2;
668 
669         for (i = 0; i < addrlen; i++) {
670                 __be32 xb = a1[i] ^ a2[i];
671                 if (xb)
672                         return i * 32 + 31 - __fls(ntohl(xb));
673         }
674 
675         /*
676          *      we should *never* get to this point since that 
677          *      would mean the addrs are equal
678          *
679          *      However, we do get to it 8) And exacly, when
680          *      addresses are equal 8)
681          *
682          *      ip route add 1111::/128 via ...
683          *      ip route add 1111::/64 via ...
684          *      and we are here.
685          *
686          *      Ideally, this function should stop comparison
687          *      at prefix length. It does not, but it is still OK,
688          *      if returned value is greater than prefix length.
689          *                                      --ANK (980803)
690          */
691         return addrlen << 5;
692 }
693 
694 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
695 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
696 {
697         const __be64 *a1 = token1, *a2 = token2;
698         int i;
699 
700         addrlen >>= 3;
701 
702         for (i = 0; i < addrlen; i++) {
703                 __be64 xb = a1[i] ^ a2[i];
704                 if (xb)
705                         return i * 64 + 63 - __fls(be64_to_cpu(xb));
706         }
707 
708         return addrlen << 6;
709 }
710 #endif
711 
712 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
713 {
714 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
715         if (__builtin_constant_p(addrlen) && !(addrlen & 7))
716                 return __ipv6_addr_diff64(token1, token2, addrlen);
717 #endif
718         return __ipv6_addr_diff32(token1, token2, addrlen);
719 }
720 
721 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
722 {
723         return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
724 }
725 
726 __be32 ipv6_select_ident(struct net *net,
727                          const struct in6_addr *daddr,
728                          const struct in6_addr *saddr);
729 void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
730 
731 int ip6_dst_hoplimit(struct dst_entry *dst);
732 
733 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
734                                       struct dst_entry *dst)
735 {
736         int hlimit;
737 
738         if (ipv6_addr_is_multicast(&fl6->daddr))
739                 hlimit = np->mcast_hops;
740         else
741                 hlimit = np->hop_limit;
742         if (hlimit < 0)
743                 hlimit = ip6_dst_hoplimit(dst);
744         return hlimit;
745 }
746 
747 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
748  * Equivalent to :      flow->v6addrs.src = iph->saddr;
749  *                      flow->v6addrs.dst = iph->daddr;
750  */
751 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
752                                             const struct ipv6hdr *iph)
753 {
754         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
755                      offsetof(typeof(flow->addrs), v6addrs.src) +
756                      sizeof(flow->addrs.v6addrs.src));
757         memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
758         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
759 }
760 
761 #if IS_ENABLED(CONFIG_IPV6)
762 
763 /* Sysctl settings for net ipv6.auto_flowlabels */
764 #define IP6_AUTO_FLOW_LABEL_OFF         0
765 #define IP6_AUTO_FLOW_LABEL_OPTOUT      1
766 #define IP6_AUTO_FLOW_LABEL_OPTIN       2
767 #define IP6_AUTO_FLOW_LABEL_FORCED      3
768 
769 #define IP6_AUTO_FLOW_LABEL_MAX         IP6_AUTO_FLOW_LABEL_FORCED
770 
771 #define IP6_DEFAULT_AUTO_FLOW_LABELS    IP6_AUTO_FLOW_LABEL_OPTOUT
772 
773 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
774                                         __be32 flowlabel, bool autolabel,
775                                         struct flowi6 *fl6)
776 {
777         u32 hash;
778 
779         /* @flowlabel may include more than a flow label, eg, the traffic class.
780          * Here we want only the flow label value.
781          */
782         flowlabel &= IPV6_FLOWLABEL_MASK;
783 
784         if (flowlabel ||
785             net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
786             (!autolabel &&
787              net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
788                 return flowlabel;
789 
790         hash = skb_get_hash_flowi6(skb, fl6);
791 
792         /* Since this is being sent on the wire obfuscate hash a bit
793          * to minimize possbility that any useful information to an
794          * attacker is leaked. Only lower 20 bits are relevant.
795          */
796         rol32(hash, 16);
797 
798         flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
799 
800         if (net->ipv6.sysctl.flowlabel_state_ranges)
801                 flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
802 
803         return flowlabel;
804 }
805 
806 static inline int ip6_default_np_autolabel(struct net *net)
807 {
808         switch (net->ipv6.sysctl.auto_flowlabels) {
809         case IP6_AUTO_FLOW_LABEL_OFF:
810         case IP6_AUTO_FLOW_LABEL_OPTIN:
811         default:
812                 return 0;
813         case IP6_AUTO_FLOW_LABEL_OPTOUT:
814         case IP6_AUTO_FLOW_LABEL_FORCED:
815                 return 1;
816         }
817 }
818 #else
819 static inline void ip6_set_txhash(struct sock *sk) { }
820 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
821                                         __be32 flowlabel, bool autolabel,
822                                         struct flowi6 *fl6)
823 {
824         return flowlabel;
825 }
826 static inline int ip6_default_np_autolabel(struct net *net)
827 {
828         return 0;
829 }
830 #endif
831 
832 
833 /*
834  *      Header manipulation
835  */
836 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
837                                 __be32 flowlabel)
838 {
839         *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
840 }
841 
842 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
843 {
844         return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
845 }
846 
847 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
848 {
849         return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
850 }
851 
852 static inline u8 ip6_tclass(__be32 flowinfo)
853 {
854         return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
855 }
856 
857 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
858 {
859         return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
860 }
861 
862 /*
863  *      Prototypes exported by ipv6
864  */
865 
866 /*
867  *      rcv function (called from netdevice level)
868  */
869 
870 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
871              struct packet_type *pt, struct net_device *orig_dev);
872 
873 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
874 
875 /*
876  *      upper-layer output functions
877  */
878 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
879              __u32 mark, struct ipv6_txoptions *opt, int tclass);
880 
881 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
882 
883 int ip6_append_data(struct sock *sk,
884                     int getfrag(void *from, char *to, int offset, int len,
885                                 int odd, struct sk_buff *skb),
886                     void *from, int length, int transhdrlen,
887                     struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
888                     struct rt6_info *rt, unsigned int flags,
889                     const struct sockcm_cookie *sockc);
890 
891 int ip6_push_pending_frames(struct sock *sk);
892 
893 void ip6_flush_pending_frames(struct sock *sk);
894 
895 int ip6_send_skb(struct sk_buff *skb);
896 
897 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
898                                struct inet_cork_full *cork,
899                                struct inet6_cork *v6_cork);
900 struct sk_buff *ip6_make_skb(struct sock *sk,
901                              int getfrag(void *from, char *to, int offset,
902                                          int len, int odd, struct sk_buff *skb),
903                              void *from, int length, int transhdrlen,
904                              struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
905                              struct rt6_info *rt, unsigned int flags,
906                              const struct sockcm_cookie *sockc);
907 
908 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
909 {
910         return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
911                               &inet6_sk(sk)->cork);
912 }
913 
914 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
915                    struct flowi6 *fl6);
916 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
917                                       const struct in6_addr *final_dst);
918 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
919                                          const struct in6_addr *final_dst);
920 struct dst_entry *ip6_blackhole_route(struct net *net,
921                                       struct dst_entry *orig_dst);
922 
923 /*
924  *      skb processing functions
925  */
926 
927 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
928 int ip6_forward(struct sk_buff *skb);
929 int ip6_input(struct sk_buff *skb);
930 int ip6_mc_input(struct sk_buff *skb);
931 
932 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
933 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
934 
935 /*
936  *      Extension header (options) processing
937  */
938 
939 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
940                           u8 *proto, struct in6_addr **daddr_p,
941                           struct in6_addr *saddr);
942 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
943                          u8 *proto);
944 
945 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
946                      __be16 *frag_offp);
947 
948 bool ipv6_ext_hdr(u8 nexthdr);
949 
950 enum {
951         IP6_FH_F_FRAG           = (1 << 0),
952         IP6_FH_F_AUTH           = (1 << 1),
953         IP6_FH_F_SKIP_RH        = (1 << 2),
954 };
955 
956 /* find specified header and get offset to it */
957 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
958                   unsigned short *fragoff, int *fragflg);
959 
960 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
961 
962 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
963                                 const struct ipv6_txoptions *opt,
964                                 struct in6_addr *orig);
965 
966 /*
967  *      socket options (ipv6_sockglue.c)
968  */
969 
970 int ipv6_setsockopt(struct sock *sk, int level, int optname,
971                     char __user *optval, unsigned int optlen);
972 int ipv6_getsockopt(struct sock *sk, int level, int optname,
973                     char __user *optval, int __user *optlen);
974 int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
975                            char __user *optval, unsigned int optlen);
976 int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
977                            char __user *optval, int __user *optlen);
978 
979 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
980                            int addr_len);
981 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
982 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
983                                  int addr_len);
984 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
985 void ip6_datagram_release_cb(struct sock *sk);
986 
987 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
988                     int *addr_len);
989 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
990                      int *addr_len);
991 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
992                      u32 info, u8 *payload);
993 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
994 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
995 
996 int inet6_release(struct socket *sock);
997 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
998 int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len,
999                   int peer);
1000 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1001 
1002 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1003                               struct sock *sk);
1004 
1005 /*
1006  * reassembly.c
1007  */
1008 extern const struct proto_ops inet6_stream_ops;
1009 extern const struct proto_ops inet6_dgram_ops;
1010 
1011 struct group_source_req;
1012 struct group_filter;
1013 
1014 int ip6_mc_source(int add, int omode, struct sock *sk,
1015                   struct group_source_req *pgsr);
1016 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
1017 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1018                   struct group_filter __user *optval, int __user *optlen);
1019 
1020 #ifdef CONFIG_PROC_FS
1021 int ac6_proc_init(struct net *net);
1022 void ac6_proc_exit(struct net *net);
1023 int raw6_proc_init(void);
1024 void raw6_proc_exit(void);
1025 int tcp6_proc_init(struct net *net);
1026 void tcp6_proc_exit(struct net *net);
1027 int udp6_proc_init(struct net *net);
1028 void udp6_proc_exit(struct net *net);
1029 int udplite6_proc_init(void);
1030 void udplite6_proc_exit(void);
1031 int ipv6_misc_proc_init(void);
1032 void ipv6_misc_proc_exit(void);
1033 int snmp6_register_dev(struct inet6_dev *idev);
1034 int snmp6_unregister_dev(struct inet6_dev *idev);
1035 
1036 #else
1037 static inline int ac6_proc_init(struct net *net) { return 0; }
1038 static inline void ac6_proc_exit(struct net *net) { }
1039 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1040 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1041 #endif
1042 
1043 #ifdef CONFIG_SYSCTL
1044 extern struct ctl_table ipv6_route_table_template[];
1045 
1046 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1047 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1048 int ipv6_sysctl_register(void);
1049 void ipv6_sysctl_unregister(void);
1050 #endif
1051 
1052 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1053                       const struct in6_addr *addr);
1054 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1055                       const struct in6_addr *addr);
1056 #endif /* _NET_IPV6_H */
1057 

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