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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
1da177e4 LT |
7 | */ |
8 | ||
9 | #ifndef _NET_IPV6_H | |
10 | #define _NET_IPV6_H | |
11 | ||
12 | #include <linux/ipv6.h> | |
13 | #include <linux/hardirq.h> | |
08dcdbf6 | 14 | #include <linux/jhash.h> |
0aeea21a | 15 | #include <linux/refcount.h> |
59c820b2 | 16 | #include <linux/jump_label_ratelimit.h> |
20283d84 | 17 | #include <net/if_inet6.h> |
1da177e4 LT |
18 | #include <net/ndisc.h> |
19 | #include <net/flow.h> | |
1bd758eb | 20 | #include <net/flow_dissector.h> |
1da177e4 | 21 | #include <net/snmp.h> |
f0b1e64c | 22 | #include <net/netns/hash.h> |
1da177e4 LT |
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. */ | |
c12b395a | 38 | #define NEXTHDR_GRE 47 /* GRE header. */ |
1da177e4 LT |
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. */ | |
280c571e | 44 | #define NEXTHDR_SCTP 132 /* SCTP message. */ |
2b741653 | 45 | #define NEXTHDR_MOBILITY 135 /* Mobility header. */ |
1da177e4 LT |
46 | |
47 | #define NEXTHDR_MAX 255 | |
48 | ||
1da177e4 LT |
49 | #define IPV6_DEFAULT_HOPLIMIT 64 |
50 | #define IPV6_DEFAULT_MCASTHOPS 1 | |
51 | ||
47d3d7ac TH |
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 | ||
1da177e4 LT |
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 | ||
82695b30 SH |
105 | #define IPV6_ADDR_UNICAST 0x0001U |
106 | #define IPV6_ADDR_MULTICAST 0x0002U | |
1da177e4 LT |
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 | |
1da177e4 LT |
117 | |
118 | /* | |
119 | * Addr scopes | |
120 | */ | |
1da177e4 LT |
121 | #define IPV6_ADDR_MC_SCOPE(a) \ |
122 | ((a)->s6_addr[1] & 0x0f) /* nonstandard */ | |
123 | #define __IPV6_ADDR_SCOPE_INVALID -1 | |
1da177e4 LT |
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 | ||
5ced1339 LL |
130 | /* |
131 | * Addr flags | |
132 | */ | |
5ced1339 LL |
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) | |
5ced1339 | 139 | |
1da177e4 LT |
140 | /* |
141 | * fragmentation header | |
142 | */ | |
143 | ||
144 | struct frag_hdr { | |
44473a6b AV |
145 | __u8 nexthdr; |
146 | __u8 reserved; | |
147 | __be16 frag_off; | |
148 | __be32 identification; | |
1da177e4 LT |
149 | }; |
150 | ||
1431fb31 PD |
151 | #define IP6_MF 0x0001 |
152 | #define IP6_OFFSET 0xFFF8 | |
1da177e4 | 153 | |
0feca619 PNA |
154 | struct ip6_fraglist_iter { |
155 | struct ipv6hdr *tmp_hdr; | |
0feca619 PNA |
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 | ||
8a6a1f17 PNA |
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 | ||
e110861f LC |
197 | #define IP6_REPLY_MARK(net, mark) \ |
198 | ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) | |
199 | ||
1da177e4 LT |
200 | #include <net/sock.h> |
201 | ||
202 | /* sysctls */ | |
1da177e4 | 203 | extern int sysctl_mld_max_msf; |
2f711939 | 204 | extern int sysctl_mld_qrv; |
3d7cc2ba | 205 | |
13415e46 | 206 | #define _DEVINC(net, statname, mod, idev, field) \ |
14878f75 | 207 | ({ \ |
a11d206d YH |
208 | struct inet6_dev *_idev = (idev); \ |
209 | if (likely(_idev != NULL)) \ | |
13415e46 ED |
210 | mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ |
211 | mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ | |
a11d206d | 212 | }) |
14878f75 | 213 | |
be281e55 | 214 | /* per device counters are atomic_long_t */ |
13415e46 | 215 | #define _DEVINCATOMIC(net, statname, mod, idev, field) \ |
be281e55 ED |
216 | ({ \ |
217 | struct inet6_dev *_idev = (idev); \ | |
218 | if (likely(_idev != NULL)) \ | |
219 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ | |
13415e46 | 220 | mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ |
be281e55 ED |
221 | }) |
222 | ||
2a24444f ED |
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 | ||
13415e46 | 232 | #define _DEVADD(net, statname, mod, idev, field, val) \ |
8e7999c4 PE |
233 | ({ \ |
234 | struct inet6_dev *_idev = (idev); \ | |
235 | if (likely(_idev != NULL)) \ | |
13415e46 ED |
236 | mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ |
237 | mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ | |
8e7999c4 PE |
238 | }) |
239 | ||
13415e46 | 240 | #define _DEVUPD(net, statname, mod, idev, field, val) \ |
edf391ff NH |
241 | ({ \ |
242 | struct inet6_dev *_idev = (idev); \ | |
243 | if (likely(_idev != NULL)) \ | |
13415e46 ED |
244 | mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ |
245 | mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ | |
edf391ff NH |
246 | }) |
247 | ||
14878f75 | 248 | /* MIBs */ |
14878f75 | 249 | |
087fe240 | 250 | #define IP6_INC_STATS(net, idev,field) \ |
13415e46 | 251 | _DEVINC(net, ipv6, , idev, field) |
1d015503 | 252 | #define __IP6_INC_STATS(net, idev,field) \ |
13415e46 | 253 | _DEVINC(net, ipv6, __, idev, field) |
edf391ff | 254 | #define IP6_ADD_STATS(net, idev,field,val) \ |
13415e46 | 255 | _DEVADD(net, ipv6, , idev, field, val) |
1d015503 | 256 | #define __IP6_ADD_STATS(net, idev,field,val) \ |
13415e46 | 257 | _DEVADD(net, ipv6, __, idev, field, val) |
edf391ff | 258 | #define IP6_UPD_PO_STATS(net, idev,field,val) \ |
13415e46 | 259 | _DEVUPD(net, ipv6, , idev, field, val) |
c2005eb0 | 260 | #define __IP6_UPD_PO_STATS(net, idev,field,val) \ |
13415e46 | 261 | _DEVUPD(net, ipv6, __, idev, field, val) |
087fe240 | 262 | #define ICMP6_INC_STATS(net, idev, field) \ |
be281e55 | 263 | _DEVINCATOMIC(net, icmpv6, , idev, field) |
a16292a0 | 264 | #define __ICMP6_INC_STATS(net, idev, field) \ |
13415e46 | 265 | _DEVINCATOMIC(net, icmpv6, __, idev, field) |
087fe240 DL |
266 | |
267 | #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ | |
2a24444f | 268 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
f3832ed2 | 269 | #define ICMP6MSGIN_INC_STATS(net, idev, field) \ |
2a24444f | 270 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) |
14878f75 | 271 | |
fd2c3ef7 | 272 | struct ip6_ra_chain { |
1da177e4 LT |
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 | ||
fd2c3ef7 | 287 | struct ipv6_txoptions { |
0aeea21a | 288 | refcount_t refcnt; |
1da177e4 LT |
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 */ | |
1da177e4 | 300 | struct ipv6_opt_hdr *dst1opt; |
45f6fad8 | 301 | struct rcu_head rcu; |
1da177e4 LT |
302 | /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ |
303 | }; | |
304 | ||
a346abe0 ED |
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 | ||
fd2c3ef7 | 312 | struct ip6_flowlabel { |
7f0e44ac | 313 | struct ip6_flowlabel __rcu *next; |
90bcaf7b | 314 | __be32 label; |
db3459d1 | 315 | atomic_t users; |
1da177e4 LT |
316 | struct in6_addr dst; |
317 | struct ipv6_txoptions *opt; | |
1da177e4 | 318 | unsigned long linger; |
d3aedd5e | 319 | struct rcu_head rcu; |
1da177e4 | 320 | u8 share; |
4f82f457 EB |
321 | union { |
322 | struct pid *pid; | |
323 | kuid_t uid; | |
324 | } owner; | |
1da177e4 LT |
325 | unsigned long lastuse; |
326 | unsigned long expires; | |
60e8fbc4 | 327 | struct net *fl_net; |
1da177e4 LT |
328 | }; |
329 | ||
82a584b7 TH |
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 | ||
37cfee90 | 334 | #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) |
d76ed22b | 335 | #define IPV6_TCLASS_SHIFT 20 |
1da177e4 | 336 | |
fd2c3ef7 | 337 | struct ipv6_fl_socklist { |
7f0e44ac ED |
338 | struct ipv6_fl_socklist __rcu *next; |
339 | struct ip6_flowlabel *fl; | |
340 | struct rcu_head rcu; | |
1da177e4 LT |
341 | }; |
342 | ||
26879da5 | 343 | struct ipcm6_cookie { |
5fdaa88d | 344 | struct sockcm_cookie sockc; |
26879da5 WW |
345 | __s16 hlimit; |
346 | __s16 tclass; | |
347 | __s8 dontfrag; | |
348 | struct ipv6_txoptions *opt; | |
bec1f6f6 | 349 | __u16 gso_size; |
26879da5 WW |
350 | }; |
351 | ||
b515430a WB |
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 | ||
45f6fad8 ED |
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); | |
e550785c | 377 | if (opt) { |
0aeea21a | 378 | if (!refcount_inc_not_zero(&opt->refcnt)) |
e550785c BP |
379 | opt = NULL; |
380 | else | |
381 | opt = rcu_pointer_handoff(opt); | |
382 | } | |
45f6fad8 ED |
383 | rcu_read_unlock(); |
384 | return opt; | |
385 | } | |
386 | ||
387 | static inline void txopt_put(struct ipv6_txoptions *opt) | |
388 | { | |
0aeea21a | 389 | if (opt && refcount_dec_and_test(&opt->refcnt)) |
45f6fad8 ED |
390 | kfree_rcu(opt, rcu); |
391 | } | |
392 | ||
59c820b2 WB |
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 | ||
5c3a0fd7 JP |
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); | |
86298285 | 409 | int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen); |
46e5f401 FF |
410 | int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, |
411 | int flags); | |
5c3a0fd7 JP |
412 | int ip6_flowlabel_init(void); |
413 | void ip6_flowlabel_cleanup(void); | |
e9191ffb | 414 | bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np); |
1da177e4 LT |
415 | |
416 | static inline void fl6_sock_release(struct ip6_flowlabel *fl) | |
417 | { | |
418 | if (fl) | |
419 | atomic_dec(&fl->users); | |
420 | } | |
421 | ||
5c3a0fd7 | 422 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); |
b94f1c09 | 423 | |
4e64b1ed JP |
424 | void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
425 | struct icmp6hdr *thdr, int len); | |
6d0bfe22 | 426 | |
5c3a0fd7 | 427 | int ip6_ra_control(struct sock *sk, int sel); |
1da177e4 | 428 | |
5c3a0fd7 | 429 | int ipv6_parse_hopopts(struct sk_buff *skb); |
1da177e4 | 430 | |
5c3a0fd7 JP |
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, | |
a9ba23d4 | 436 | struct ipv6_opt_hdr *newopt); |
df9890c3 YH |
437 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
438 | struct ipv6_txoptions *opt); | |
1da177e4 | 439 | |
a224772d ED |
440 | bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, |
441 | const struct inet6_skb_parm *opt); | |
ceba1832 HD |
442 | struct ipv6_txoptions *ipv6_update_options(struct sock *sk, |
443 | struct ipv6_txoptions *opt); | |
399c07de | 444 | |
aeaf6e9d SL |
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 | ||
c2a93660 JDB |
454 | #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ |
455 | #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ | |
9874c41c | 456 | #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ |
1da177e4 | 457 | |
5c3a0fd7 | 458 | int __ipv6_addr_type(const struct in6_addr *addr); |
b1cacb68 YH |
459 | static inline int ipv6_addr_type(const struct in6_addr *addr) |
460 | { | |
461 | return __ipv6_addr_type(addr) & 0xffff; | |
462 | } | |
1da177e4 LT |
463 | |
464 | static inline int ipv6_addr_scope(const struct in6_addr *addr) | |
465 | { | |
b1cacb68 YH |
466 | return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; |
467 | } | |
468 | ||
469 | static inline int __ipv6_addr_src_scope(int type) | |
470 | { | |
a02cec21 | 471 | return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); |
b1cacb68 YH |
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)); | |
1da177e4 LT |
477 | } |
478 | ||
b7ef213e HFS |
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 | ||
1da177e4 LT |
491 | static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) |
492 | { | |
db3459d1 | 493 | return memcmp(a1, a2, sizeof(struct in6_addr)); |
1da177e4 LT |
494 | } |
495 | ||
1a203cb3 | 496 | static inline bool |
f2ffd9ee PM |
497 | ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, |
498 | const struct in6_addr *a2) | |
499 | { | |
1a203cb3 ED |
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 | |
a02cec21 ED |
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])); | |
1a203cb3 | 512 | #endif |
f2ffd9ee PM |
513 | } |
514 | ||
82695b30 | 515 | static inline void ipv6_addr_prefix(struct in6_addr *pfx, |
1da177e4 LT |
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 | ||
db3459d1 | 523 | memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); |
1da177e4 | 524 | memcpy(pfx->s6_addr, addr, o); |
db3459d1 | 525 | if (b != 0) |
1da177e4 | 526 | pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); |
1da177e4 LT |
527 | } |
528 | ||
818f1f3e AA |
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 | ||
5206c579 YH |
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 | ||
82695b30 | 564 | static inline void ipv6_addr_set(struct in6_addr *addr, |
48818f82 AV |
565 | __be32 w1, __be32 w2, |
566 | __be32 w3, __be32 w4) | |
1da177e4 | 567 | { |
5206c579 YH |
568 | __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); |
569 | __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); | |
1da177e4 | 570 | } |
1da177e4 | 571 | |
92113bfd ED |
572 | static inline bool ipv6_addr_equal(const struct in6_addr *a1, |
573 | const struct in6_addr *a2) | |
1da177e4 | 574 | { |
1a203cb3 ED |
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 | |
a02cec21 ED |
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; | |
1a203cb3 | 585 | #endif |
1da177e4 LT |
586 | } |
587 | ||
38675170 YH |
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 | { | |
512613d7 | 593 | if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) |
38675170 YH |
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 | |
2ef97332 YH |
613 | static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, |
614 | const struct in6_addr *addr2, | |
615 | unsigned int prefixlen) | |
1da177e4 | 616 | { |
2ef97332 YH |
617 | const __be32 *a1 = addr1->s6_addr32; |
618 | const __be32 *a2 = addr2->s6_addr32; | |
95c96174 | 619 | unsigned int pdw, pbi; |
1da177e4 LT |
620 | |
621 | /* check complete u32 in prefix */ | |
622 | pdw = prefixlen >> 5; | |
623 | if (pdw && memcmp(a1, a2, pdw << 2)) | |
92113bfd | 624 | return false; |
1da177e4 LT |
625 | |
626 | /* check incomplete u32 in prefix */ | |
627 | pbi = prefixlen & 0x1f; | |
628 | if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) | |
92113bfd | 629 | return false; |
1da177e4 | 630 | |
92113bfd | 631 | return true; |
1da177e4 | 632 | } |
38675170 | 633 | #endif |
1da177e4 | 634 | |
92113bfd | 635 | static inline bool ipv6_addr_any(const struct in6_addr *a) |
1da177e4 | 636 | { |
1a203cb3 ED |
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 | |
a02cec21 ED |
642 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
643 | a->s6_addr32[2] | a->s6_addr32[3]) == 0; | |
1a203cb3 | 644 | #endif |
1da177e4 LT |
645 | } |
646 | ||
ddbe5032 ED |
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 | ||
08dcdbf6 | 660 | /* more secured version of ipv6_addr_hash() */ |
b50026b5 | 661 | static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval) |
08dcdbf6 ED |
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], | |
b50026b5 | 668 | initval); |
08dcdbf6 ED |
669 | } |
670 | ||
92113bfd | 671 | static inline bool ipv6_addr_loopback(const struct in6_addr *a) |
f630e43a | 672 | { |
e287656b | 673 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
1373a773 | 674 | const __be64 *be = (const __be64 *)a; |
e287656b | 675 | |
1373a773 | 676 | return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL; |
e287656b | 677 | #else |
a02cec21 | 678 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
1373a773 | 679 | a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0; |
e287656b | 680 | #endif |
f630e43a YH |
681 | } |
682 | ||
1373a773 JL |
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 | */ | |
92113bfd | 687 | static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) |
e773e4fa | 688 | { |
a04d40b8 YH |
689 | return ( |
690 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
1373a773 | 691 | *(unsigned long *)a | |
a04d40b8 | 692 | #else |
1373a773 | 693 | (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) | |
a04d40b8 | 694 | #endif |
1373a773 JL |
695 | (__force unsigned long)(a->s6_addr32[2] ^ |
696 | cpu_to_be32(0x0000ffff))) == 0UL; | |
e773e4fa BH |
697 | } |
698 | ||
be2644aa ED |
699 | static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a) |
700 | { | |
701 | return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]); | |
702 | } | |
703 | ||
f0b1e64c MKL |
704 | static inline u32 ipv6_portaddr_hash(const struct net *net, |
705 | const struct in6_addr *addr6, | |
706 | unsigned int port) | |
707 | { | |
708 | unsigned int hash, mix = net_hash_mix(net); | |
709 | ||
710 | if (ipv6_addr_any(addr6)) | |
711 | hash = jhash_1word(0, mix); | |
712 | else if (ipv6_addr_v4mapped(addr6)) | |
713 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); | |
714 | else | |
715 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); | |
716 | ||
717 | return hash ^ port; | |
718 | } | |
719 | ||
99cd07a5 JMT |
720 | /* |
721 | * Check for a RFC 4843 ORCHID address | |
722 | * (Overlay Routable Cryptographic Hash Identifiers) | |
723 | */ | |
92113bfd | 724 | static inline bool ipv6_addr_orchid(const struct in6_addr *a) |
99cd07a5 | 725 | { |
a02cec21 | 726 | return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); |
99cd07a5 JMT |
727 | } |
728 | ||
5c98631c LC |
729 | static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr) |
730 | { | |
731 | return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000); | |
732 | } | |
733 | ||
f15364bd AC |
734 | static inline void ipv6_addr_set_v4mapped(const __be32 addr, |
735 | struct in6_addr *v4mapped) | |
736 | { | |
737 | ipv6_addr_set(v4mapped, | |
738 | 0, 0, | |
739 | htonl(0x0000FFFF), | |
740 | addr); | |
741 | } | |
742 | ||
971f359d YH |
743 | /* |
744 | * find the first different bit between two addresses | |
745 | * length of address must be a multiple of 32bits | |
746 | */ | |
9f2e7334 | 747 | static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) |
971f359d | 748 | { |
ef296f56 | 749 | const __be32 *a1 = token1, *a2 = token2; |
971f359d YH |
750 | int i; |
751 | ||
752 | addrlen >>= 2; | |
753 | ||
754 | for (i = 0; i < addrlen; i++) { | |
ef296f56 AV |
755 | __be32 xb = a1[i] ^ a2[i]; |
756 | if (xb) | |
d57b8fb8 | 757 | return i * 32 + 31 - __fls(ntohl(xb)); |
971f359d YH |
758 | } |
759 | ||
760 | /* | |
82695b30 | 761 | * we should *never* get to this point since that |
971f359d YH |
762 | * would mean the addrs are equal |
763 | * | |
764 | * However, we do get to it 8) And exacly, when | |
765 | * addresses are equal 8) | |
766 | * | |
767 | * ip route add 1111::/128 via ... | |
768 | * ip route add 1111::/64 via ... | |
769 | * and we are here. | |
770 | * | |
771 | * Ideally, this function should stop comparison | |
772 | * at prefix length. It does not, but it is still OK, | |
773 | * if returned value is greater than prefix length. | |
774 | * --ANK (980803) | |
775 | */ | |
a02cec21 | 776 | return addrlen << 5; |
971f359d YH |
777 | } |
778 | ||
9f2e7334 YH |
779 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
780 | static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) | |
781 | { | |
782 | const __be64 *a1 = token1, *a2 = token2; | |
783 | int i; | |
784 | ||
785 | addrlen >>= 3; | |
786 | ||
787 | for (i = 0; i < addrlen; i++) { | |
788 | __be64 xb = a1[i] ^ a2[i]; | |
789 | if (xb) | |
790 | return i * 64 + 63 - __fls(be64_to_cpu(xb)); | |
791 | } | |
792 | ||
793 | return addrlen << 6; | |
794 | } | |
795 | #endif | |
796 | ||
797 | static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) | |
798 | { | |
799 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 | |
800 | if (__builtin_constant_p(addrlen) && !(addrlen & 7)) | |
801 | return __ipv6_addr_diff64(token1, token2, addrlen); | |
802 | #endif | |
803 | return __ipv6_addr_diff32(token1, token2, addrlen); | |
804 | } | |
805 | ||
971f359d YH |
806 | static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) |
807 | { | |
808 | return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); | |
809 | } | |
810 | ||
7f159867 ED |
811 | __be32 ipv6_select_ident(struct net *net, |
812 | const struct in6_addr *daddr, | |
813 | const struct in6_addr *saddr); | |
0c19f846 | 814 | __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb); |
5188cd44 | 815 | |
5c3a0fd7 | 816 | int ip6_dst_hoplimit(struct dst_entry *dst); |
3ce9b35f | 817 | |
5c98631c LC |
818 | static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, |
819 | struct dst_entry *dst) | |
820 | { | |
821 | int hlimit; | |
822 | ||
823 | if (ipv6_addr_is_multicast(&fl6->daddr)) | |
824 | hlimit = np->mcast_hops; | |
825 | else | |
826 | hlimit = np->hop_limit; | |
827 | if (hlimit < 0) | |
828 | hlimit = ip6_dst_hoplimit(dst); | |
829 | return hlimit; | |
830 | } | |
831 | ||
c3f83241 TH |
832 | /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store |
833 | * Equivalent to : flow->v6addrs.src = iph->saddr; | |
834 | * flow->v6addrs.dst = iph->daddr; | |
835 | */ | |
836 | static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, | |
837 | const struct ipv6hdr *iph) | |
838 | { | |
839 | BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != | |
840 | offsetof(typeof(flow->addrs), v6addrs.src) + | |
841 | sizeof(flow->addrs.v6addrs.src)); | |
842 | memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs)); | |
843 | flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
844 | } | |
845 | ||
a37934fc | 846 | #if IS_ENABLED(CONFIG_IPV6) |
42240901 | 847 | |
db57dc7c VB |
848 | static inline bool ipv6_can_nonlocal_bind(struct net *net, |
849 | struct inet_sock *inet) | |
850 | { | |
851 | return net->ipv6.sysctl.ip_nonlocal_bind || | |
852 | inet->freebind || inet->transparent; | |
853 | } | |
854 | ||
42240901 TH |
855 | /* Sysctl settings for net ipv6.auto_flowlabels */ |
856 | #define IP6_AUTO_FLOW_LABEL_OFF 0 | |
857 | #define IP6_AUTO_FLOW_LABEL_OPTOUT 1 | |
858 | #define IP6_AUTO_FLOW_LABEL_OPTIN 2 | |
859 | #define IP6_AUTO_FLOW_LABEL_FORCED 3 | |
860 | ||
861 | #define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED | |
862 | ||
b5677416 | 863 | #define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT |
42240901 | 864 | |
cb1ce2ef | 865 | static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, |
67800f9b TH |
866 | __be32 flowlabel, bool autolabel, |
867 | struct flowi6 *fl6) | |
cb1ce2ef | 868 | { |
42240901 | 869 | u32 hash; |
cb1ce2ef | 870 | |
90427ef5 DM |
871 | /* @flowlabel may include more than a flow label, eg, the traffic class. |
872 | * Here we want only the flow label value. | |
873 | */ | |
874 | flowlabel &= IPV6_FLOWLABEL_MASK; | |
875 | ||
42240901 TH |
876 | if (flowlabel || |
877 | net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || | |
878 | (!autolabel && | |
879 | net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) | |
880 | return flowlabel; | |
cb1ce2ef | 881 | |
42240901 | 882 | hash = skb_get_hash_flowi6(skb, fl6); |
cb1ce2ef | 883 | |
42240901 TH |
884 | /* Since this is being sent on the wire obfuscate hash a bit |
885 | * to minimize possbility that any useful information to an | |
886 | * attacker is leaked. Only lower 20 bits are relevant. | |
887 | */ | |
169dc027 | 888 | hash = rol32(hash, 16); |
82a584b7 | 889 | |
42240901 TH |
890 | flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; |
891 | ||
892 | if (net->ipv6.sysctl.flowlabel_state_ranges) | |
893 | flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; | |
cb1ce2ef TH |
894 | |
895 | return flowlabel; | |
896 | } | |
42240901 TH |
897 | |
898 | static inline int ip6_default_np_autolabel(struct net *net) | |
899 | { | |
900 | switch (net->ipv6.sysctl.auto_flowlabels) { | |
901 | case IP6_AUTO_FLOW_LABEL_OFF: | |
902 | case IP6_AUTO_FLOW_LABEL_OPTIN: | |
903 | default: | |
904 | return 0; | |
905 | case IP6_AUTO_FLOW_LABEL_OPTOUT: | |
906 | case IP6_AUTO_FLOW_LABEL_FORCED: | |
907 | return 1; | |
908 | } | |
909 | } | |
a37934fc | 910 | #else |
a37934fc | 911 | static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, |
42240901 TH |
912 | __be32 flowlabel, bool autolabel, |
913 | struct flowi6 *fl6) | |
a37934fc FF |
914 | { |
915 | return flowlabel; | |
916 | } | |
42240901 TH |
917 | static inline int ip6_default_np_autolabel(struct net *net) |
918 | { | |
919 | return 0; | |
920 | } | |
a37934fc FF |
921 | #endif |
922 | ||
918ee507 PM |
923 | #if IS_ENABLED(CONFIG_IPV6) |
924 | static inline int ip6_multipath_hash_policy(const struct net *net) | |
925 | { | |
926 | return net->ipv6.sysctl.multipath_hash_policy; | |
927 | } | |
928 | #else | |
929 | static inline int ip6_multipath_hash_policy(const struct net *net) | |
930 | { | |
931 | return 0; | |
932 | } | |
933 | #endif | |
cb1ce2ef | 934 | |
3e4e4c1f YH |
935 | /* |
936 | * Header manipulation | |
937 | */ | |
938 | static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, | |
939 | __be32 flowlabel) | |
940 | { | |
07f623d3 | 941 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; |
3e4e4c1f YH |
942 | } |
943 | ||
6502ca52 YH |
944 | static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) |
945 | { | |
946 | return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; | |
947 | } | |
948 | ||
3308de2b FF |
949 | static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr) |
950 | { | |
951 | return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK; | |
952 | } | |
953 | ||
d76ed22b LR |
954 | static inline u8 ip6_tclass(__be32 flowinfo) |
955 | { | |
956 | return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT; | |
957 | } | |
eaa93bf4 DB |
958 | |
959 | static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) | |
960 | { | |
961 | return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; | |
962 | } | |
963 | ||
fa1be7e0 MK |
964 | static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6) |
965 | { | |
966 | return fl6->flowlabel & IPV6_FLOWLABEL_MASK; | |
967 | } | |
968 | ||
1da177e4 LT |
969 | /* |
970 | * Prototypes exported by ipv6 | |
971 | */ | |
972 | ||
973 | /* | |
974 | * rcv function (called from netdevice level) | |
975 | */ | |
976 | ||
5c3a0fd7 JP |
977 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, |
978 | struct packet_type *pt, struct net_device *orig_dev); | |
d8269e2c EC |
979 | void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, |
980 | struct net_device *orig_dev); | |
1da177e4 | 981 | |
0c4b51f0 | 982 | int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb); |
b05e1066 | 983 | |
1da177e4 LT |
984 | /* |
985 | * upper-layer output functions | |
986 | */ | |
1c1e9d2b | 987 | int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
4f6570d7 | 988 | __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority); |
5c3a0fd7 JP |
989 | |
990 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); | |
991 | ||
992 | int ip6_append_data(struct sock *sk, | |
993 | int getfrag(void *from, char *to, int offset, int len, | |
994 | int odd, struct sk_buff *skb), | |
26879da5 WW |
995 | void *from, int length, int transhdrlen, |
996 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, | |
5fdaa88d | 997 | struct rt6_info *rt, unsigned int flags); |
5c3a0fd7 JP |
998 | |
999 | int ip6_push_pending_frames(struct sock *sk); | |
1000 | ||
1001 | void ip6_flush_pending_frames(struct sock *sk); | |
1002 | ||
6422398c VY |
1003 | int ip6_send_skb(struct sk_buff *skb); |
1004 | ||
1005 | struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, | |
1006 | struct inet_cork_full *cork, | |
1007 | struct inet6_cork *v6_cork); | |
1008 | struct sk_buff *ip6_make_skb(struct sock *sk, | |
1009 | int getfrag(void *from, char *to, int offset, | |
1010 | int len, int odd, struct sk_buff *skb), | |
1011 | void *from, int length, int transhdrlen, | |
26879da5 WW |
1012 | struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
1013 | struct rt6_info *rt, unsigned int flags, | |
5fdaa88d | 1014 | struct inet_cork_full *cork); |
6422398c VY |
1015 | |
1016 | static inline struct sk_buff *ip6_finish_skb(struct sock *sk) | |
1017 | { | |
1018 | return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, | |
1019 | &inet6_sk(sk)->cork); | |
1020 | } | |
1021 | ||
343d60aa RP |
1022 | int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
1023 | struct flowi6 *fl6); | |
c4e85f73 | 1024 | struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, |
0e0d44ab | 1025 | const struct in6_addr *final_dst); |
5c3a0fd7 | 1026 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
96818159 AK |
1027 | const struct in6_addr *final_dst, |
1028 | bool connected); | |
571912c6 MV |
1029 | struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb, |
1030 | struct net_device *dev, | |
1031 | struct net *net, struct socket *sock, | |
1032 | struct in6_addr *saddr, | |
1033 | const struct ip_tunnel_info *info, | |
1034 | u8 protocol, bool use_cache); | |
5c3a0fd7 JP |
1035 | struct dst_entry *ip6_blackhole_route(struct net *net, |
1036 | struct dst_entry *orig_dst); | |
1da177e4 LT |
1037 | |
1038 | /* | |
1039 | * skb processing functions | |
1040 | */ | |
1041 | ||
ede2059d | 1042 | int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb); |
5c3a0fd7 JP |
1043 | int ip6_forward(struct sk_buff *skb); |
1044 | int ip6_input(struct sk_buff *skb); | |
1045 | int ip6_mc_input(struct sk_buff *skb); | |
80bde363 PA |
1046 | void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, |
1047 | bool have_final); | |
1da177e4 | 1048 | |
cf91a99d | 1049 | int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
33224b16 | 1050 | int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
ef76bc23 | 1051 | |
1da177e4 LT |
1052 | /* |
1053 | * Extension header (options) processing | |
1054 | */ | |
1055 | ||
5c3a0fd7 | 1056 | void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
613fa3ca DL |
1057 | u8 *proto, struct in6_addr **daddr_p, |
1058 | struct in6_addr *saddr); | |
5c3a0fd7 JP |
1059 | void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
1060 | u8 *proto); | |
1da177e4 | 1061 | |
5c3a0fd7 JP |
1062 | int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, |
1063 | __be16 *frag_offp); | |
1da177e4 | 1064 | |
5c3a0fd7 | 1065 | bool ipv6_ext_hdr(u8 nexthdr); |
1da177e4 | 1066 | |
f8f62675 | 1067 | enum { |
9195bb8e AA |
1068 | IP6_FH_F_FRAG = (1 << 0), |
1069 | IP6_FH_F_AUTH = (1 << 1), | |
1070 | IP6_FH_F_SKIP_RH = (1 << 2), | |
f8f62675 JG |
1071 | }; |
1072 | ||
1073 | /* find specified header and get offset to it */ | |
5c3a0fd7 JP |
1074 | int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, |
1075 | unsigned short *fragoff, int *fragflg); | |
f8f62675 | 1076 | |
0868383b | 1077 | int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type); |
c61a4043 | 1078 | |
5c3a0fd7 JP |
1079 | struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
1080 | const struct ipv6_txoptions *opt, | |
1081 | struct in6_addr *orig); | |
20c59de2 | 1082 | |
1da177e4 LT |
1083 | /* |
1084 | * socket options (ipv6_sockglue.c) | |
1085 | */ | |
1086 | ||
a7b75c5a CH |
1087 | int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
1088 | unsigned int optlen); | |
5c3a0fd7 JP |
1089 | int ipv6_getsockopt(struct sock *sk, int level, int optname, |
1090 | char __user *optval, int __user *optlen); | |
5c3a0fd7 | 1091 | |
0382a25a GN |
1092 | int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, |
1093 | int addr_len); | |
5c3a0fd7 | 1094 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); |
82b276cd HFS |
1095 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, |
1096 | int addr_len); | |
33c162a9 | 1097 | int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr); |
e646b657 | 1098 | void ip6_datagram_release_cb(struct sock *sk); |
5c3a0fd7 | 1099 | |
85fbaa75 HFS |
1100 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, |
1101 | int *addr_len); | |
1102 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, | |
1103 | int *addr_len); | |
5c3a0fd7 JP |
1104 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
1105 | u32 info, u8 *payload); | |
1106 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); | |
1107 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); | |
1108 | ||
1109 | int inet6_release(struct socket *sock); | |
1110 | int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); | |
9b2c45d4 | 1111 | int inet6_getname(struct socket *sock, struct sockaddr *uaddr, |
5c3a0fd7 JP |
1112 | int peer); |
1113 | int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); | |
3986912f CH |
1114 | int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, |
1115 | unsigned long arg); | |
5c3a0fd7 JP |
1116 | |
1117 | int inet6_hash_connect(struct inet_timewait_death_row *death_row, | |
d8313f5c | 1118 | struct sock *sk); |
e42f1ac6 FW |
1119 | int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size); |
1120 | int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, | |
1121 | int flags); | |
d8313f5c | 1122 | |
1da177e4 LT |
1123 | /* |
1124 | * reassembly.c | |
1125 | */ | |
90ddc4f0 ED |
1126 | extern const struct proto_ops inet6_stream_ops; |
1127 | extern const struct proto_ops inet6_dgram_ops; | |
77d4b1d3 | 1128 | extern const struct proto_ops inet6_sockraw_ops; |
20380731 | 1129 | |
14c85021 ACM |
1130 | struct group_source_req; |
1131 | struct group_filter; | |
1132 | ||
5c3a0fd7 JP |
1133 | int ip6_mc_source(int add, int omode, struct sock *sk, |
1134 | struct group_source_req *pgsr); | |
d59eb177 AV |
1135 | int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, |
1136 | struct sockaddr_storage *list); | |
5c3a0fd7 | 1137 | int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
931ca7ab | 1138 | struct sockaddr_storage __user *p); |
20380731 ACM |
1139 | |
1140 | #ifdef CONFIG_PROC_FS | |
5c3a0fd7 JP |
1141 | int ac6_proc_init(struct net *net); |
1142 | void ac6_proc_exit(struct net *net); | |
1143 | int raw6_proc_init(void); | |
1144 | void raw6_proc_exit(void); | |
1145 | int tcp6_proc_init(struct net *net); | |
1146 | void tcp6_proc_exit(struct net *net); | |
1147 | int udp6_proc_init(struct net *net); | |
1148 | void udp6_proc_exit(struct net *net); | |
1149 | int udplite6_proc_init(void); | |
1150 | void udplite6_proc_exit(void); | |
1151 | int ipv6_misc_proc_init(void); | |
1152 | void ipv6_misc_proc_exit(void); | |
1153 | int snmp6_register_dev(struct inet6_dev *idev); | |
1154 | int snmp6_unregister_dev(struct inet6_dev *idev); | |
20380731 | 1155 | |
7f7d9a6b | 1156 | #else |
6ab57e7e DL |
1157 | static inline int ac6_proc_init(struct net *net) { return 0; } |
1158 | static inline void ac6_proc_exit(struct net *net) { } | |
1159 | static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } | |
1160 | static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } | |
20380731 | 1161 | #endif |
1da177e4 | 1162 | |
20380731 | 1163 | #ifdef CONFIG_SYSCTL |
5c3a0fd7 JP |
1164 | struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
1165 | struct ctl_table *ipv6_route_sysctl_init(struct net *net); | |
1166 | int ipv6_sysctl_register(void); | |
1167 | void ipv6_sysctl_unregister(void); | |
20380731 | 1168 | #endif |
1da177e4 | 1169 | |
46a4dee0 MC |
1170 | int ipv6_sock_mc_join(struct sock *sk, int ifindex, |
1171 | const struct in6_addr *addr); | |
c7ea20c9 HL |
1172 | int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, |
1173 | const struct in6_addr *addr, unsigned int mode); | |
46a4dee0 MC |
1174 | int ipv6_sock_mc_drop(struct sock *sk, int ifindex, |
1175 | const struct in6_addr *addr); | |
9b115749 CH |
1176 | |
1177 | static inline int ip6_sock_set_v6only(struct sock *sk) | |
1178 | { | |
1179 | if (inet_sk(sk)->inet_num) | |
1180 | return -EINVAL; | |
1181 | lock_sock(sk); | |
1182 | sk->sk_ipv6only = true; | |
1183 | release_sock(sk); | |
1184 | return 0; | |
1185 | } | |
1186 | ||
fce93494 CH |
1187 | static inline void ip6_sock_set_recverr(struct sock *sk) |
1188 | { | |
1189 | lock_sock(sk); | |
1190 | inet6_sk(sk)->recverr = true; | |
1191 | release_sock(sk); | |
1192 | } | |
1193 | ||
18d5ad62 CH |
1194 | static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val) |
1195 | { | |
1196 | unsigned int pref = 0; | |
1197 | unsigned int prefmask = ~0; | |
1198 | ||
1199 | /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ | |
1200 | switch (val & (IPV6_PREFER_SRC_PUBLIC | | |
1201 | IPV6_PREFER_SRC_TMP | | |
1202 | IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { | |
1203 | case IPV6_PREFER_SRC_PUBLIC: | |
1204 | pref |= IPV6_PREFER_SRC_PUBLIC; | |
1205 | prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | | |
1206 | IPV6_PREFER_SRC_TMP); | |
1207 | break; | |
1208 | case IPV6_PREFER_SRC_TMP: | |
1209 | pref |= IPV6_PREFER_SRC_TMP; | |
1210 | prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | | |
1211 | IPV6_PREFER_SRC_TMP); | |
1212 | break; | |
1213 | case IPV6_PREFER_SRC_PUBTMP_DEFAULT: | |
1214 | prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | | |
1215 | IPV6_PREFER_SRC_TMP); | |
1216 | break; | |
1217 | case 0: | |
1218 | break; | |
1219 | default: | |
1220 | return -EINVAL; | |
1221 | } | |
1222 | ||
1223 | /* check HOME/COA conflicts */ | |
1224 | switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { | |
1225 | case IPV6_PREFER_SRC_HOME: | |
1226 | prefmask &= ~IPV6_PREFER_SRC_COA; | |
1227 | break; | |
1228 | case IPV6_PREFER_SRC_COA: | |
1229 | pref |= IPV6_PREFER_SRC_COA; | |
1230 | break; | |
1231 | case 0: | |
1232 | break; | |
1233 | default: | |
1234 | return -EINVAL; | |
1235 | } | |
1236 | ||
1237 | /* check CGA/NONCGA conflicts */ | |
1238 | switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { | |
1239 | case IPV6_PREFER_SRC_CGA: | |
1240 | case IPV6_PREFER_SRC_NONCGA: | |
1241 | case 0: | |
1242 | break; | |
1243 | default: | |
1244 | return -EINVAL; | |
1245 | } | |
1246 | ||
1247 | inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref; | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val) | |
1252 | { | |
1253 | int ret; | |
1254 | ||
1255 | lock_sock(sk); | |
1256 | ret = __ip6_sock_set_addr_preferences(sk, val); | |
1257 | release_sock(sk); | |
1258 | return ret; | |
1259 | } | |
1260 | ||
7d7207c2 CH |
1261 | static inline void ip6_sock_set_recvpktinfo(struct sock *sk) |
1262 | { | |
1263 | lock_sock(sk); | |
1264 | inet6_sk(sk)->rxopt.bits.rxinfo = true; | |
1265 | release_sock(sk); | |
1266 | } | |
1267 | ||
20380731 | 1268 | #endif /* _NET_IPV6_H */ |