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[IPV4/IPV6]: Fail registration if inet device construction fails
[deliverable/linux.git] / include / net / ipv6.h
CommitLineData
1da177e4
LT		 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. */
2b741653 43#define NEXTHDR_MOBILITY 135 /* Mobility header. */
1da177e4
LT		 44
45#define NEXTHDR_MAX 255
46
47
48
49#define IPV6_DEFAULT_HOPLIMIT 64
50#define IPV6_DEFAULT_MCASTHOPS 1
51
52/*
53 * Addr type
54 *
55 * type - unicast | multicast
56 * scope - local | site | global
57 * v4 - compat
58 * v4mapped
59 * any
60 * loopback
61 */
62
63#define IPV6_ADDR_ANY 0x0000U
64
65#define IPV6_ADDR_UNICAST 0x0001U
66#define IPV6_ADDR_MULTICAST 0x0002U
67
68#define IPV6_ADDR_LOOPBACK 0x0010U
69#define IPV6_ADDR_LINKLOCAL 0x0020U
70#define IPV6_ADDR_SITELOCAL 0x0040U
71
72#define IPV6_ADDR_COMPATv4 0x0080U
73
74#define IPV6_ADDR_SCOPE_MASK 0x00f0U
75
76#define IPV6_ADDR_MAPPED 0x1000U
77#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
78
79/*
80 * Addr scopes
81 */
82#ifdef __KERNEL__
83#define IPV6_ADDR_MC_SCOPE(a) \
84 ((a)->s6_addr[1] & 0x0f) /* nonstandard */
85#define __IPV6_ADDR_SCOPE_INVALID -1
86#endif
87#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
88#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
89#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
90#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
91#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
92
93/*
94 * fragmentation header
95 */
96
97struct frag_hdr {
44473a6b
AV		 98 __u8 nexthdr;
99 __u8 reserved;
100 __be16 frag_off;
101 __be32 identification;
1da177e4
LT		 102};
103
104#define IP6_MF 0x0001
105
106#ifdef __KERNEL__
107
108#include <net/sock.h>
109
110/* sysctls */
111extern int sysctl_ipv6_bindv6only;
112extern int sysctl_mld_max_msf;
113
114/* MIBs */
115DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
a11d206d
YH		 116#define IP6_INC_STATS(idev,field) ({ \
117 struct inet6_dev *_idev = (idev); \
118 if (likely(_idev != NULL)) \
119 SNMP_INC_STATS(_idev->stats.ipv6, field); \
120 SNMP_INC_STATS(ipv6_statistics, field); \
121})
122#define IP6_INC_STATS_BH(idev,field) ({ \
123 struct inet6_dev *_idev = (idev); \
124 if (likely(_idev != NULL)) \
125 SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \
126 SNMP_INC_STATS_BH(ipv6_statistics, field); \
127})
128#define IP6_INC_STATS_USER(idev,field) ({ \
129 struct inet6_dev *_idev = (idev); \
130 if (likely(_idev != NULL)) \
131 SNMP_INC_STATS_USER(_idev->stats.ipv6, field); \
132 SNMP_INC_STATS_USER(ipv6_statistics, field); \
133})
1da177e4
LT		 134DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
135#define ICMP6_INC_STATS(idev, field) ({ \
136 struct inet6_dev *_idev = (idev); \
137 if (likely(_idev != NULL)) \
138 SNMP_INC_STATS(idev->stats.icmpv6, field); \
139 SNMP_INC_STATS(icmpv6_statistics, field); \
140})
141#define ICMP6_INC_STATS_BH(idev, field) ({ \
142 struct inet6_dev *_idev = (idev); \
143 if (likely(_idev != NULL)) \
144 SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
145 SNMP_INC_STATS_BH(icmpv6_statistics, field); \
146})
147#define ICMP6_INC_STATS_USER(idev, field) ({ \
148 struct inet6_dev *_idev = (idev); \
149 if (likely(_idev != NULL)) \
150 SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
151 SNMP_INC_STATS_USER(icmpv6_statistics, field); \
152})
153#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
154 struct inet6_dev *_idev = idev; \
155 __typeof__(offset) _offset = (offset); \
156 if (likely(_idev != NULL)) \
157 SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
158 SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
159})
160DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
ba4e58ec
GR		 161DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
162#define UDP6_INC_STATS_BH(field, is_udplite) do { \
163 if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
164 else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
165#define UDP6_INC_STATS_USER(field, is_udplite) do { \
166 if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
167 else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
1da177e4 168
1da177e4
LT		 169struct ip6_ra_chain
170{
171 struct ip6_ra_chain *next;
172 struct sock *sk;
173 int sel;
174 void (*destructor)(struct sock *);
175};
176
177extern struct ip6_ra_chain *ip6_ra_chain;
178extern rwlock_t ip6_ra_lock;
179
180/*
181 This structure is prepared by protocol, when parsing
182 ancillary data and passed to IPv6.
183 */
184
185struct ipv6_txoptions
186{
187 /* Length of this structure */
188 int tot_len;
189
190 /* length of extension headers */
191
192 __u16 opt_flen; /* after fragment hdr */
193 __u16 opt_nflen; /* before fragment hdr */
194
195 struct ipv6_opt_hdr *hopopt;
196 struct ipv6_opt_hdr *dst0opt;
197 struct ipv6_rt_hdr *srcrt; /* Routing Header */
1da177e4
LT		 198 struct ipv6_opt_hdr *dst1opt;
199
200 /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
201};
202
203struct ip6_flowlabel
204{
205 struct ip6_flowlabel *next;
90bcaf7b 206 __be32 label;
db3459d1 207 atomic_t users;
1da177e4
LT		 208 struct in6_addr dst;
209 struct ipv6_txoptions *opt;
1da177e4
LT		 210 unsigned long linger;
211 u8 share;
212 u32 owner;
213 unsigned long lastuse;
214 unsigned long expires;
215};
216
217#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
218#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
219
220struct ipv6_fl_socklist
221{
222 struct ipv6_fl_socklist *next;
223 struct ip6_flowlabel *fl;
224};
225
90bcaf7b 226extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label);
1da177e4
LT		 227extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
228 struct ip6_flowlabel * fl,
229 struct ipv6_txoptions * fopt);
230extern void fl6_free_socklist(struct sock *sk);
231extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
232extern void ip6_flowlabel_init(void);
233extern void ip6_flowlabel_cleanup(void);
234
235static inline void fl6_sock_release(struct ip6_flowlabel *fl)
236{
237 if (fl)
238 atomic_dec(&fl->users);
239}
240
241extern int ip6_ra_control(struct sock *sk, int sel,
242 void (*destructor)(struct sock *));
243
244
a80ff03e 245extern int ipv6_parse_hopopts(struct sk_buff **skbp);
1da177e4
LT		 246
247extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
333fad53
YH		 248extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
249 int newtype,
250 struct ipv6_opt_hdr __user *newopt,
251 int newoptlen);
df9890c3
YH		 252struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
253 struct ipv6_txoptions *opt);
1da177e4 254
399c07de
ACM		 255extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
256
1da177e4
LT		 257extern int ip6_frag_nqueues;
258extern atomic_t ip6_frag_mem;
259
260#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
261
262/*
263 * Function prototype for build_xmit
264 */
265
266typedef int (*inet_getfrag_t) (const void *data,
267 struct in6_addr *addr,
268 char *,
269 unsigned int, unsigned int);
270
b1cacb68
YH		 271extern int __ipv6_addr_type(const struct in6_addr *addr);
272static inline int ipv6_addr_type(const struct in6_addr *addr)
273{
274 return __ipv6_addr_type(addr) & 0xffff;
275}
1da177e4
LT		 276
277static inline int ipv6_addr_scope(const struct in6_addr *addr)
278{
b1cacb68
YH		 279 return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
280}
281
282static inline int __ipv6_addr_src_scope(int type)
283{
284 return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
285}
286
287static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
288{
289 return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
1da177e4
LT		 290}
291
292static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
293{
db3459d1 294 return memcmp(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 295}
296
f2ffd9ee
PM		 297static inline int
298ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
299 const struct in6_addr *a2)
300{
301 unsigned int i;
302
303 for (i = 0; i < 4; i++)
304 if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
305 return 1;
306 return 0;
307}
308
1da177e4
LT		 309static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
310{
db3459d1 311 memcpy(a1, a2, sizeof(struct in6_addr));
1da177e4
LT		 312}
313
314static inline void ipv6_addr_prefix(struct in6_addr *pfx,
315 const struct in6_addr *addr,
316 int plen)
317{
318 /* caller must guarantee 0 <= plen <= 128 */
319 int o = plen >> 3,
320 b = plen & 0x7;
321
db3459d1 322 memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
1da177e4 323 memcpy(pfx->s6_addr, addr, o);
db3459d1 324 if (b != 0)
1da177e4 325 pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
1da177e4
LT		 326}
327
1da177e4 328static inline void ipv6_addr_set(struct in6_addr *addr,
48818f82
AV		 329 __be32 w1, __be32 w2,
330 __be32 w3, __be32 w4)
1da177e4
LT		 331{
332 addr->s6_addr32[0] = w1;
333 addr->s6_addr32[1] = w2;
334 addr->s6_addr32[2] = w3;
335 addr->s6_addr32[3] = w4;
336}
1da177e4
LT		 337
338static inline int ipv6_addr_equal(const struct in6_addr *a1,
339 const struct in6_addr *a2)
340{
341 return (a1->s6_addr32[0] == a2->s6_addr32[0] &&
342 a1->s6_addr32[1] == a2->s6_addr32[1] &&
343 a1->s6_addr32[2] == a2->s6_addr32[2] &&
344 a1->s6_addr32[3] == a2->s6_addr32[3]);
345}
346
48818f82 347static inline int __ipv6_prefix_equal(const __be32 *a1, const __be32 *a2,
1da177e4
LT		 348 unsigned int prefixlen)
349{
350 unsigned pdw, pbi;
351
352 /* check complete u32 in prefix */
353 pdw = prefixlen >> 5;
354 if (pdw && memcmp(a1, a2, pdw << 2))
355 return 0;
356
357 /* check incomplete u32 in prefix */
358 pbi = prefixlen & 0x1f;
359 if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
360 return 0;
361
362 return 1;
363}
364
365static inline int ipv6_prefix_equal(const struct in6_addr *a1,
366 const struct in6_addr *a2,
367 unsigned int prefixlen)
368{
369 return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
370 prefixlen);
371}
372
373static inline int ipv6_addr_any(const struct in6_addr *a)
374{
375 return ((a->s6_addr32[0] | a->s6_addr32[1] |
376 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
377}
378
971f359d
YH		 379/*
380 * find the first different bit between two addresses
381 * length of address must be a multiple of 32bits
382 */
383static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
384{
ef296f56 385 const __be32 *a1 = token1, *a2 = token2;
971f359d
YH		 386 int i;
387
388 addrlen >>= 2;
389
390 for (i = 0; i < addrlen; i++) {
ef296f56
AV		 391 __be32 xb = a1[i] ^ a2[i];
392 if (xb)
393 return i * 32 + 32 - fls(ntohl(xb));
971f359d
YH		 394 }
395
396 /*
397 * we should *never* get to this point since that
398 * would mean the addrs are equal
399 *
400 * However, we do get to it 8) And exacly, when
401 * addresses are equal 8)
402 *
403 * ip route add 1111::/128 via ...
404 * ip route add 1111::/64 via ...
405 * and we are here.
406 *
407 * Ideally, this function should stop comparison
408 * at prefix length. It does not, but it is still OK,
409 * if returned value is greater than prefix length.
410 * --ANK (980803)
411 */
412 return (addrlen << 5);
413}
414
415static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
416{
417 return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
418}
419
1da177e4
LT		 420/*
421 * Prototypes exported by ipv6
422 */
423
424/*
425 * rcv function (called from netdevice level)
426 */
427
428extern int ipv6_rcv(struct sk_buff *skb,
429 struct net_device *dev,
f2ccd8fa
DM		 430 struct packet_type *pt,
431 struct net_device *orig_dev);
1da177e4 432
b05e1066
PM		 433extern int ip6_rcv_finish(struct sk_buff *skb);
434
1da177e4
LT		 435/*
436 * upper-layer output functions
437 */
438extern int ip6_xmit(struct sock *sk,
439 struct sk_buff *skb,
440 struct flowi *fl,
441 struct ipv6_txoptions *opt,
442 int ipfragok);
443
444extern int ip6_nd_hdr(struct sock *sk,
445 struct sk_buff *skb,
446 struct net_device *dev,
447 struct in6_addr *saddr,
448 struct in6_addr *daddr,
449 int proto, int len);
450
451extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
452
453extern int ip6_append_data(struct sock *sk,
454 int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
455 void *from,
456 int length,
457 int transhdrlen,
458 int hlimit,
41a1f8ea 459 int tclass,
1da177e4
LT		 460 struct ipv6_txoptions *opt,
461 struct flowi *fl,
462 struct rt6_info *rt,
463 unsigned int flags);
464
465extern int ip6_push_pending_frames(struct sock *sk);
466
467extern void ip6_flush_pending_frames(struct sock *sk);
468
469extern int ip6_dst_lookup(struct sock *sk,
470 struct dst_entry **dst,
471 struct flowi *fl);
14e50e57
DM		 472extern int ip6_dst_blackhole(struct sock *sk,
473 struct dst_entry **dst,
474 struct flowi *fl);
497c615a
HX		 475extern int ip6_sk_dst_lookup(struct sock *sk,
476 struct dst_entry **dst,
477 struct flowi *fl);
1da177e4
LT		 478
479/*
480 * skb processing functions
481 */
482
483extern int ip6_output(struct sk_buff *skb);
484extern int ip6_forward(struct sk_buff *skb);
485extern int ip6_input(struct sk_buff *skb);
486extern int ip6_mc_input(struct sk_buff *skb);
487
488/*
489 * Extension header (options) processing
490 */
491
492extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
493 u8 *prev_hdr,
494 struct ipv6_txoptions *opt,
495 struct in6_addr *daddr,
496 u32 jumbolen);
497extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
498 u8 *prev_hdr,
499 struct ipv6_txoptions *opt);
500extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
501 struct ipv6_txoptions *opt,
502 u8 *proto,
503 struct in6_addr **daddr_p);
504extern void ipv6_push_frag_opts(struct sk_buff *skb,
505 struct ipv6_txoptions *opt,
506 u8 *proto);
507
508extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
0d3d077c 509 u8 *nexthdrp);
1da177e4
LT		 510
511extern int ipv6_ext_hdr(u8 nexthdr);
512
c61a4043
MN		 513extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
514
1da177e4
LT		 515/*
516 * socket options (ipv6_sockglue.c)
517 */
518
519extern int ipv6_setsockopt(struct sock *sk, int level,
520 int optname,
521 char __user *optval,
522 int optlen);
523extern int ipv6_getsockopt(struct sock *sk, int level,
524 int optname,
525 char __user *optval,
526 int __user *optlen);
3fdadf7d
DM		 527extern int compat_ipv6_setsockopt(struct sock *sk,
528 int level,
529 int optname,
530 char __user *optval,
531 int optlen);
532extern int compat_ipv6_getsockopt(struct sock *sk,
533 int level,
534 int optname,
535 char __user *optval,
536 int __user *optlen);
1da177e4
LT		 537
538extern void ipv6_packet_init(void);
539
540extern void ipv6_packet_cleanup(void);
541
542extern int ip6_datagram_connect(struct sock *sk,
543 struct sockaddr *addr, int addr_len);
544
545extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
e69a4adc 546extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1da177e4
LT		 547 u32 info, u8 *payload);
548extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
549
550extern int inet6_release(struct socket *sock);
551extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
552 int addr_len);
553extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
554 int *uaddr_len, int peer);
555extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
556 unsigned long arg);
557
d8313f5c
ACM		 558extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
559 struct sock *sk);
560
1da177e4
LT		 561/*
562 * reassembly.c
563 */
564extern int sysctl_ip6frag_high_thresh;
565extern int sysctl_ip6frag_low_thresh;
566extern int sysctl_ip6frag_time;
567extern int sysctl_ip6frag_secret_interval;
568
90ddc4f0
ED		 569extern const struct proto_ops inet6_stream_ops;
570extern const struct proto_ops inet6_dgram_ops;
20380731 571
14c85021
ACM		 572struct group_source_req;
573struct group_filter;
574
20380731
ACM		 575extern int ip6_mc_source(int add, int omode, struct sock *sk,
576 struct group_source_req *pgsr);
577extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
578extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
579 struct group_filter __user *optval,
580 int __user *optlen);
581
582#ifdef CONFIG_PROC_FS
583extern int ac6_proc_init(void);
584extern void ac6_proc_exit(void);
585extern int raw6_proc_init(void);
586extern void raw6_proc_exit(void);
587extern int tcp6_proc_init(void);
588extern void tcp6_proc_exit(void);
589extern int udp6_proc_init(void);
590extern void udp6_proc_exit(void);
ba4e58ec
GR		 591extern int udplite6_proc_init(void);
592extern void udplite6_proc_exit(void);
20380731
ACM		 593extern int ipv6_misc_proc_init(void);
594extern void ipv6_misc_proc_exit(void);
7f7d9a6b
HX		 595extern int snmp6_register_dev(struct inet6_dev *idev);
596extern int snmp6_unregister_dev(struct inet6_dev *idev);
20380731
ACM		 597
598extern struct rt6_statistics rt6_stats;
7f7d9a6b
HX		 599#else
600static inline int snmp6_register_dev(struct inet6_dev *idev)
601{
602 return 0;
603}
604
605static inline int snmp6_unregister_dev(struct inet6_dev *idev)
606{
607 return 0;
608}
20380731 609#endif
1da177e4 610
20380731
ACM		 611#ifdef CONFIG_SYSCTL
612extern ctl_table ipv6_route_table[];
613extern ctl_table ipv6_icmp_table[];
1da177e4 614
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ACM		 615extern void ipv6_sysctl_register(void);
616extern void ipv6_sysctl_unregister(void);
617#endif
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ACM		 619#endif /* __KERNEL__ */
620#endif /* _NET_IPV6_H */
Linux kernel - Deliverables
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