| 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 <net/if_inet6.h> |
| 19 | #include <net/ndisc.h> |
| 20 | #include <net/flow.h> |
| 21 | #include <net/snmp.h> |
| 22 | |
| 23 | #define SIN6_LEN_RFC2133 24 |
| 24 | |
| 25 | #define IPV6_MAXPLEN 65535 |
| 26 | |
| 27 | /* |
| 28 | * NextHeader field of IPv6 header |
| 29 | */ |
| 30 | |
| 31 | #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ |
| 32 | #define NEXTHDR_TCP 6 /* TCP segment. */ |
| 33 | #define NEXTHDR_UDP 17 /* UDP message. */ |
| 34 | #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ |
| 35 | #define NEXTHDR_ROUTING 43 /* Routing header. */ |
| 36 | #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ |
| 37 | #define NEXTHDR_GRE 47 /* GRE header. */ |
| 38 | #define NEXTHDR_ESP 50 /* Encapsulating security payload. */ |
| 39 | #define NEXTHDR_AUTH 51 /* Authentication header. */ |
| 40 | #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ |
| 41 | #define NEXTHDR_NONE 59 /* No next header */ |
| 42 | #define NEXTHDR_DEST 60 /* Destination options header. */ |
| 43 | #define NEXTHDR_MOBILITY 135 /* Mobility header. */ |
| 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 | |
| 78 | /* |
| 79 | * Addr scopes |
| 80 | */ |
| 81 | #define IPV6_ADDR_MC_SCOPE(a) \ |
| 82 | ((a)->s6_addr[1] & 0x0f) /* nonstandard */ |
| 83 | #define __IPV6_ADDR_SCOPE_INVALID -1 |
| 84 | #define IPV6_ADDR_SCOPE_NODELOCAL 0x01 |
| 85 | #define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 |
| 86 | #define IPV6_ADDR_SCOPE_SITELOCAL 0x05 |
| 87 | #define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 |
| 88 | #define IPV6_ADDR_SCOPE_GLOBAL 0x0e |
| 89 | |
| 90 | /* |
| 91 | * Addr flags |
| 92 | */ |
| 93 | #define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ |
| 94 | ((a)->s6_addr[1] & 0x10) |
| 95 | #define IPV6_ADDR_MC_FLAG_PREFIX(a) \ |
| 96 | ((a)->s6_addr[1] & 0x20) |
| 97 | #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ |
| 98 | ((a)->s6_addr[1] & 0x40) |
| 99 | |
| 100 | /* |
| 101 | * fragmentation header |
| 102 | */ |
| 103 | |
| 104 | struct frag_hdr { |
| 105 | __u8 nexthdr; |
| 106 | __u8 reserved; |
| 107 | __be16 frag_off; |
| 108 | __be32 identification; |
| 109 | }; |
| 110 | |
| 111 | #define IP6_MF 0x0001 |
| 112 | |
| 113 | #include <net/sock.h> |
| 114 | |
| 115 | /* sysctls */ |
| 116 | extern int sysctl_mld_max_msf; |
| 117 | |
| 118 | #define _DEVINC(net, statname, modifier, idev, field) \ |
| 119 | ({ \ |
| 120 | struct inet6_dev *_idev = (idev); \ |
| 121 | if (likely(_idev != NULL)) \ |
| 122 | SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ |
| 123 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ |
| 124 | }) |
| 125 | |
| 126 | /* per device counters are atomic_long_t */ |
| 127 | #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ |
| 128 | ({ \ |
| 129 | struct inet6_dev *_idev = (idev); \ |
| 130 | if (likely(_idev != NULL)) \ |
| 131 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ |
| 132 | SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ |
| 133 | }) |
| 134 | |
| 135 | /* per device and per net counters are atomic_long_t */ |
| 136 | #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ |
| 137 | ({ \ |
| 138 | struct inet6_dev *_idev = (idev); \ |
| 139 | if (likely(_idev != NULL)) \ |
| 140 | SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ |
| 141 | SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ |
| 142 | }) |
| 143 | |
| 144 | #define _DEVADD(net, statname, modifier, idev, field, val) \ |
| 145 | ({ \ |
| 146 | struct inet6_dev *_idev = (idev); \ |
| 147 | if (likely(_idev != NULL)) \ |
| 148 | SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ |
| 149 | SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ |
| 150 | }) |
| 151 | |
| 152 | #define _DEVUPD(net, statname, modifier, idev, field, val) \ |
| 153 | ({ \ |
| 154 | struct inet6_dev *_idev = (idev); \ |
| 155 | if (likely(_idev != NULL)) \ |
| 156 | SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ |
| 157 | SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ |
| 158 | }) |
| 159 | |
| 160 | /* MIBs */ |
| 161 | |
| 162 | #define IP6_INC_STATS(net, idev,field) \ |
| 163 | _DEVINC(net, ipv6, 64, idev, field) |
| 164 | #define IP6_INC_STATS_BH(net, idev,field) \ |
| 165 | _DEVINC(net, ipv6, 64_BH, idev, field) |
| 166 | #define IP6_ADD_STATS(net, idev,field,val) \ |
| 167 | _DEVADD(net, ipv6, 64, idev, field, val) |
| 168 | #define IP6_ADD_STATS_BH(net, idev,field,val) \ |
| 169 | _DEVADD(net, ipv6, 64_BH, idev, field, val) |
| 170 | #define IP6_UPD_PO_STATS(net, idev,field,val) \ |
| 171 | _DEVUPD(net, ipv6, 64, idev, field, val) |
| 172 | #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ |
| 173 | _DEVUPD(net, ipv6, 64_BH, idev, field, val) |
| 174 | #define ICMP6_INC_STATS(net, idev, field) \ |
| 175 | _DEVINCATOMIC(net, icmpv6, , idev, field) |
| 176 | #define ICMP6_INC_STATS_BH(net, idev, field) \ |
| 177 | _DEVINCATOMIC(net, icmpv6, _BH, idev, field) |
| 178 | |
| 179 | #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ |
| 180 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
| 181 | #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ |
| 182 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
| 183 | #define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \ |
| 184 | _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) |
| 185 | |
| 186 | struct ip6_ra_chain { |
| 187 | struct ip6_ra_chain *next; |
| 188 | struct sock *sk; |
| 189 | int sel; |
| 190 | void (*destructor)(struct sock *); |
| 191 | }; |
| 192 | |
| 193 | extern struct ip6_ra_chain *ip6_ra_chain; |
| 194 | extern rwlock_t ip6_ra_lock; |
| 195 | |
| 196 | /* |
| 197 | This structure is prepared by protocol, when parsing |
| 198 | ancillary data and passed to IPv6. |
| 199 | */ |
| 200 | |
| 201 | struct ipv6_txoptions { |
| 202 | /* Length of this structure */ |
| 203 | int tot_len; |
| 204 | |
| 205 | /* length of extension headers */ |
| 206 | |
| 207 | __u16 opt_flen; /* after fragment hdr */ |
| 208 | __u16 opt_nflen; /* before fragment hdr */ |
| 209 | |
| 210 | struct ipv6_opt_hdr *hopopt; |
| 211 | struct ipv6_opt_hdr *dst0opt; |
| 212 | struct ipv6_rt_hdr *srcrt; /* Routing Header */ |
| 213 | struct ipv6_opt_hdr *dst1opt; |
| 214 | |
| 215 | /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ |
| 216 | }; |
| 217 | |
| 218 | struct ip6_flowlabel { |
| 219 | struct ip6_flowlabel *next; |
| 220 | __be32 label; |
| 221 | atomic_t users; |
| 222 | struct in6_addr dst; |
| 223 | struct ipv6_txoptions *opt; |
| 224 | unsigned long linger; |
| 225 | u8 share; |
| 226 | union { |
| 227 | struct pid *pid; |
| 228 | kuid_t uid; |
| 229 | } owner; |
| 230 | unsigned long lastuse; |
| 231 | unsigned long expires; |
| 232 | struct net *fl_net; |
| 233 | }; |
| 234 | |
| 235 | #define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) |
| 236 | #define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) |
| 237 | |
| 238 | struct ipv6_fl_socklist { |
| 239 | struct ipv6_fl_socklist *next; |
| 240 | struct ip6_flowlabel *fl; |
| 241 | }; |
| 242 | |
| 243 | extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); |
| 244 | extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, |
| 245 | struct ip6_flowlabel * fl, |
| 246 | struct ipv6_txoptions * fopt); |
| 247 | extern void fl6_free_socklist(struct sock *sk); |
| 248 | extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); |
| 249 | extern int ip6_flowlabel_init(void); |
| 250 | extern void ip6_flowlabel_cleanup(void); |
| 251 | |
| 252 | static inline void fl6_sock_release(struct ip6_flowlabel *fl) |
| 253 | { |
| 254 | if (fl) |
| 255 | atomic_dec(&fl->users); |
| 256 | } |
| 257 | |
| 258 | extern void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); |
| 259 | |
| 260 | extern int ip6_ra_control(struct sock *sk, int sel); |
| 261 | |
| 262 | extern int ipv6_parse_hopopts(struct sk_buff *skb); |
| 263 | |
| 264 | extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt); |
| 265 | extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, |
| 266 | int newtype, |
| 267 | struct ipv6_opt_hdr __user *newopt, |
| 268 | int newoptlen); |
| 269 | struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
| 270 | struct ipv6_txoptions *opt); |
| 271 | |
| 272 | extern bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb); |
| 273 | |
| 274 | static inline bool ipv6_accept_ra(struct inet6_dev *idev) |
| 275 | { |
| 276 | /* If forwarding is enabled, RA are not accepted unless the special |
| 277 | * hybrid mode (accept_ra=2) is enabled. |
| 278 | */ |
| 279 | return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : |
| 280 | idev->cnf.accept_ra; |
| 281 | } |
| 282 | |
| 283 | #if IS_ENABLED(CONFIG_IPV6) |
| 284 | static inline int ip6_frag_nqueues(struct net *net) |
| 285 | { |
| 286 | return net->ipv6.frags.nqueues; |
| 287 | } |
| 288 | |
| 289 | static inline int ip6_frag_mem(struct net *net) |
| 290 | { |
| 291 | return atomic_read(&net->ipv6.frags.mem); |
| 292 | } |
| 293 | #endif |
| 294 | |
| 295 | #define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ |
| 296 | #define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ |
| 297 | #define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ |
| 298 | |
| 299 | extern int __ipv6_addr_type(const struct in6_addr *addr); |
| 300 | static inline int ipv6_addr_type(const struct in6_addr *addr) |
| 301 | { |
| 302 | return __ipv6_addr_type(addr) & 0xffff; |
| 303 | } |
| 304 | |
| 305 | static inline int ipv6_addr_scope(const struct in6_addr *addr) |
| 306 | { |
| 307 | return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; |
| 308 | } |
| 309 | |
| 310 | static inline int __ipv6_addr_src_scope(int type) |
| 311 | { |
| 312 | return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); |
| 313 | } |
| 314 | |
| 315 | static inline int ipv6_addr_src_scope(const struct in6_addr *addr) |
| 316 | { |
| 317 | return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); |
| 318 | } |
| 319 | |
| 320 | static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) |
| 321 | { |
| 322 | return memcmp(a1, a2, sizeof(struct in6_addr)); |
| 323 | } |
| 324 | |
| 325 | static inline bool |
| 326 | ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, |
| 327 | const struct in6_addr *a2) |
| 328 | { |
| 329 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 330 | const unsigned long *ul1 = (const unsigned long *)a1; |
| 331 | const unsigned long *ulm = (const unsigned long *)m; |
| 332 | const unsigned long *ul2 = (const unsigned long *)a2; |
| 333 | |
| 334 | return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | |
| 335 | ((ul1[1] ^ ul2[1]) & ulm[1])); |
| 336 | #else |
| 337 | return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | |
| 338 | ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | |
| 339 | ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | |
| 340 | ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); |
| 341 | #endif |
| 342 | } |
| 343 | |
| 344 | static inline void ipv6_addr_prefix(struct in6_addr *pfx, |
| 345 | const struct in6_addr *addr, |
| 346 | int plen) |
| 347 | { |
| 348 | /* caller must guarantee 0 <= plen <= 128 */ |
| 349 | int o = plen >> 3, |
| 350 | b = plen & 0x7; |
| 351 | |
| 352 | memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); |
| 353 | memcpy(pfx->s6_addr, addr, o); |
| 354 | if (b != 0) |
| 355 | pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); |
| 356 | } |
| 357 | |
| 358 | static inline void __ipv6_addr_set_half(__be32 *addr, |
| 359 | __be32 wh, __be32 wl) |
| 360 | { |
| 361 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 362 | #if defined(__BIG_ENDIAN) |
| 363 | if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { |
| 364 | *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); |
| 365 | return; |
| 366 | } |
| 367 | #elif defined(__LITTLE_ENDIAN) |
| 368 | if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { |
| 369 | *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); |
| 370 | return; |
| 371 | } |
| 372 | #endif |
| 373 | #endif |
| 374 | addr[0] = wh; |
| 375 | addr[1] = wl; |
| 376 | } |
| 377 | |
| 378 | static inline void ipv6_addr_set(struct in6_addr *addr, |
| 379 | __be32 w1, __be32 w2, |
| 380 | __be32 w3, __be32 w4) |
| 381 | { |
| 382 | __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); |
| 383 | __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); |
| 384 | } |
| 385 | |
| 386 | static inline bool ipv6_addr_equal(const struct in6_addr *a1, |
| 387 | const struct in6_addr *a2) |
| 388 | { |
| 389 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 390 | const unsigned long *ul1 = (const unsigned long *)a1; |
| 391 | const unsigned long *ul2 = (const unsigned long *)a2; |
| 392 | |
| 393 | return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; |
| 394 | #else |
| 395 | return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | |
| 396 | (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | |
| 397 | (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | |
| 398 | (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; |
| 399 | #endif |
| 400 | } |
| 401 | |
| 402 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 403 | static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, |
| 404 | const __be64 *a2, |
| 405 | unsigned int len) |
| 406 | { |
| 407 | if (len && ((*a1 ^ *a2) & cpu_to_be64(~0UL) << (64 - len))) |
| 408 | return false; |
| 409 | return true; |
| 410 | } |
| 411 | |
| 412 | static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, |
| 413 | const struct in6_addr *addr2, |
| 414 | unsigned int prefixlen) |
| 415 | { |
| 416 | const __be64 *a1 = (const __be64 *)addr1; |
| 417 | const __be64 *a2 = (const __be64 *)addr2; |
| 418 | |
| 419 | if (prefixlen >= 64) { |
| 420 | if (a1[0] ^ a2[0]) |
| 421 | return false; |
| 422 | return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); |
| 423 | } |
| 424 | return __ipv6_prefix_equal64_half(a1, a2, prefixlen); |
| 425 | } |
| 426 | #else |
| 427 | static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, |
| 428 | const struct in6_addr *addr2, |
| 429 | unsigned int prefixlen) |
| 430 | { |
| 431 | const __be32 *a1 = addr1->s6_addr32; |
| 432 | const __be32 *a2 = addr2->s6_addr32; |
| 433 | unsigned int pdw, pbi; |
| 434 | |
| 435 | /* check complete u32 in prefix */ |
| 436 | pdw = prefixlen >> 5; |
| 437 | if (pdw && memcmp(a1, a2, pdw << 2)) |
| 438 | return false; |
| 439 | |
| 440 | /* check incomplete u32 in prefix */ |
| 441 | pbi = prefixlen & 0x1f; |
| 442 | if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) |
| 443 | return false; |
| 444 | |
| 445 | return true; |
| 446 | } |
| 447 | #endif |
| 448 | |
| 449 | struct inet_frag_queue; |
| 450 | |
| 451 | enum ip6_defrag_users { |
| 452 | IP6_DEFRAG_LOCAL_DELIVER, |
| 453 | IP6_DEFRAG_CONNTRACK_IN, |
| 454 | __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
| 455 | IP6_DEFRAG_CONNTRACK_OUT, |
| 456 | __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
| 457 | IP6_DEFRAG_CONNTRACK_BRIDGE_IN, |
| 458 | __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
| 459 | }; |
| 460 | |
| 461 | struct ip6_create_arg { |
| 462 | __be32 id; |
| 463 | u32 user; |
| 464 | const struct in6_addr *src; |
| 465 | const struct in6_addr *dst; |
| 466 | }; |
| 467 | |
| 468 | void ip6_frag_init(struct inet_frag_queue *q, void *a); |
| 469 | bool ip6_frag_match(struct inet_frag_queue *q, void *a); |
| 470 | |
| 471 | /* |
| 472 | * Equivalent of ipv4 struct ip |
| 473 | */ |
| 474 | struct frag_queue { |
| 475 | struct inet_frag_queue q; |
| 476 | |
| 477 | __be32 id; /* fragment id */ |
| 478 | u32 user; |
| 479 | struct in6_addr saddr; |
| 480 | struct in6_addr daddr; |
| 481 | |
| 482 | int iif; |
| 483 | unsigned int csum; |
| 484 | __u16 nhoffset; |
| 485 | }; |
| 486 | |
| 487 | void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, |
| 488 | struct inet_frags *frags); |
| 489 | |
| 490 | static inline bool ipv6_addr_any(const struct in6_addr *a) |
| 491 | { |
| 492 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 493 | const unsigned long *ul = (const unsigned long *)a; |
| 494 | |
| 495 | return (ul[0] | ul[1]) == 0UL; |
| 496 | #else |
| 497 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
| 498 | a->s6_addr32[2] | a->s6_addr32[3]) == 0; |
| 499 | #endif |
| 500 | } |
| 501 | |
| 502 | static inline u32 ipv6_addr_hash(const struct in6_addr *a) |
| 503 | { |
| 504 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 505 | const unsigned long *ul = (const unsigned long *)a; |
| 506 | unsigned long x = ul[0] ^ ul[1]; |
| 507 | |
| 508 | return (u32)(x ^ (x >> 32)); |
| 509 | #else |
| 510 | return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ |
| 511 | a->s6_addr32[2] ^ a->s6_addr32[3]); |
| 512 | #endif |
| 513 | } |
| 514 | |
| 515 | static inline bool ipv6_addr_loopback(const struct in6_addr *a) |
| 516 | { |
| 517 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 518 | const unsigned long *ul = (const unsigned long *)a; |
| 519 | |
| 520 | return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL; |
| 521 | #else |
| 522 | return (a->s6_addr32[0] | a->s6_addr32[1] | |
| 523 | a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0; |
| 524 | #endif |
| 525 | } |
| 526 | |
| 527 | static inline bool ipv6_addr_v4mapped(const struct in6_addr *a) |
| 528 | { |
| 529 | return ( |
| 530 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 531 | *(__be64 *)a | |
| 532 | #else |
| 533 | (a->s6_addr32[0] | a->s6_addr32[1]) | |
| 534 | #endif |
| 535 | (a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Check for a RFC 4843 ORCHID address |
| 540 | * (Overlay Routable Cryptographic Hash Identifiers) |
| 541 | */ |
| 542 | static inline bool ipv6_addr_orchid(const struct in6_addr *a) |
| 543 | { |
| 544 | return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010); |
| 545 | } |
| 546 | |
| 547 | static inline void ipv6_addr_set_v4mapped(const __be32 addr, |
| 548 | struct in6_addr *v4mapped) |
| 549 | { |
| 550 | ipv6_addr_set(v4mapped, |
| 551 | 0, 0, |
| 552 | htonl(0x0000FFFF), |
| 553 | addr); |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * find the first different bit between two addresses |
| 558 | * length of address must be a multiple of 32bits |
| 559 | */ |
| 560 | static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen) |
| 561 | { |
| 562 | const __be32 *a1 = token1, *a2 = token2; |
| 563 | int i; |
| 564 | |
| 565 | addrlen >>= 2; |
| 566 | |
| 567 | for (i = 0; i < addrlen; i++) { |
| 568 | __be32 xb = a1[i] ^ a2[i]; |
| 569 | if (xb) |
| 570 | return i * 32 + 31 - __fls(ntohl(xb)); |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * we should *never* get to this point since that |
| 575 | * would mean the addrs are equal |
| 576 | * |
| 577 | * However, we do get to it 8) And exacly, when |
| 578 | * addresses are equal 8) |
| 579 | * |
| 580 | * ip route add 1111::/128 via ... |
| 581 | * ip route add 1111::/64 via ... |
| 582 | * and we are here. |
| 583 | * |
| 584 | * Ideally, this function should stop comparison |
| 585 | * at prefix length. It does not, but it is still OK, |
| 586 | * if returned value is greater than prefix length. |
| 587 | * --ANK (980803) |
| 588 | */ |
| 589 | return addrlen << 5; |
| 590 | } |
| 591 | |
| 592 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 593 | static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen) |
| 594 | { |
| 595 | const __be64 *a1 = token1, *a2 = token2; |
| 596 | int i; |
| 597 | |
| 598 | addrlen >>= 3; |
| 599 | |
| 600 | for (i = 0; i < addrlen; i++) { |
| 601 | __be64 xb = a1[i] ^ a2[i]; |
| 602 | if (xb) |
| 603 | return i * 64 + 63 - __fls(be64_to_cpu(xb)); |
| 604 | } |
| 605 | |
| 606 | return addrlen << 6; |
| 607 | } |
| 608 | #endif |
| 609 | |
| 610 | static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen) |
| 611 | { |
| 612 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
| 613 | if (__builtin_constant_p(addrlen) && !(addrlen & 7)) |
| 614 | return __ipv6_addr_diff64(token1, token2, addrlen); |
| 615 | #endif |
| 616 | return __ipv6_addr_diff32(token1, token2, addrlen); |
| 617 | } |
| 618 | |
| 619 | static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2) |
| 620 | { |
| 621 | return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr)); |
| 622 | } |
| 623 | |
| 624 | extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt); |
| 625 | |
| 626 | /* |
| 627 | * Header manipulation |
| 628 | */ |
| 629 | static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, |
| 630 | __be32 flowlabel) |
| 631 | { |
| 632 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel; |
| 633 | } |
| 634 | |
| 635 | static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr) |
| 636 | { |
| 637 | return *(__be32 *)hdr & IPV6_FLOWINFO_MASK; |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Prototypes exported by ipv6 |
| 642 | */ |
| 643 | |
| 644 | /* |
| 645 | * rcv function (called from netdevice level) |
| 646 | */ |
| 647 | |
| 648 | extern int ipv6_rcv(struct sk_buff *skb, |
| 649 | struct net_device *dev, |
| 650 | struct packet_type *pt, |
| 651 | struct net_device *orig_dev); |
| 652 | |
| 653 | extern int ip6_rcv_finish(struct sk_buff *skb); |
| 654 | |
| 655 | /* |
| 656 | * upper-layer output functions |
| 657 | */ |
| 658 | extern int ip6_xmit(struct sock *sk, |
| 659 | struct sk_buff *skb, |
| 660 | struct flowi6 *fl6, |
| 661 | struct ipv6_txoptions *opt, |
| 662 | int tclass); |
| 663 | |
| 664 | extern int ip6_nd_hdr(struct sock *sk, |
| 665 | struct sk_buff *skb, |
| 666 | struct net_device *dev, |
| 667 | const struct in6_addr *saddr, |
| 668 | const struct in6_addr *daddr, |
| 669 | int proto, int len); |
| 670 | |
| 671 | extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); |
| 672 | |
| 673 | extern int ip6_append_data(struct sock *sk, |
| 674 | int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), |
| 675 | void *from, |
| 676 | int length, |
| 677 | int transhdrlen, |
| 678 | int hlimit, |
| 679 | int tclass, |
| 680 | struct ipv6_txoptions *opt, |
| 681 | struct flowi6 *fl6, |
| 682 | struct rt6_info *rt, |
| 683 | unsigned int flags, |
| 684 | int dontfrag); |
| 685 | |
| 686 | extern int ip6_push_pending_frames(struct sock *sk); |
| 687 | |
| 688 | extern void ip6_flush_pending_frames(struct sock *sk); |
| 689 | |
| 690 | extern int ip6_dst_lookup(struct sock *sk, |
| 691 | struct dst_entry **dst, |
| 692 | struct flowi6 *fl6); |
| 693 | extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk, |
| 694 | struct flowi6 *fl6, |
| 695 | const struct in6_addr *final_dst, |
| 696 | bool can_sleep); |
| 697 | extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk, |
| 698 | struct flowi6 *fl6, |
| 699 | const struct in6_addr *final_dst, |
| 700 | bool can_sleep); |
| 701 | extern struct dst_entry * ip6_blackhole_route(struct net *net, |
| 702 | struct dst_entry *orig_dst); |
| 703 | |
| 704 | /* |
| 705 | * skb processing functions |
| 706 | */ |
| 707 | |
| 708 | extern int ip6_output(struct sk_buff *skb); |
| 709 | extern int ip6_forward(struct sk_buff *skb); |
| 710 | extern int ip6_input(struct sk_buff *skb); |
| 711 | extern int ip6_mc_input(struct sk_buff *skb); |
| 712 | |
| 713 | extern int __ip6_local_out(struct sk_buff *skb); |
| 714 | extern int ip6_local_out(struct sk_buff *skb); |
| 715 | |
| 716 | /* |
| 717 | * Extension header (options) processing |
| 718 | */ |
| 719 | |
| 720 | extern void ipv6_push_nfrag_opts(struct sk_buff *skb, |
| 721 | struct ipv6_txoptions *opt, |
| 722 | u8 *proto, |
| 723 | struct in6_addr **daddr_p); |
| 724 | extern void ipv6_push_frag_opts(struct sk_buff *skb, |
| 725 | struct ipv6_txoptions *opt, |
| 726 | u8 *proto); |
| 727 | |
| 728 | extern int ipv6_skip_exthdr(const struct sk_buff *, int start, |
| 729 | u8 *nexthdrp, __be16 *frag_offp); |
| 730 | |
| 731 | extern bool ipv6_ext_hdr(u8 nexthdr); |
| 732 | |
| 733 | enum { |
| 734 | IP6_FH_F_FRAG = (1 << 0), |
| 735 | IP6_FH_F_AUTH = (1 << 1), |
| 736 | IP6_FH_F_SKIP_RH = (1 << 2), |
| 737 | }; |
| 738 | |
| 739 | /* find specified header and get offset to it */ |
| 740 | extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, |
| 741 | int target, unsigned short *fragoff, int *fragflg); |
| 742 | |
| 743 | extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type); |
| 744 | |
| 745 | extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6, |
| 746 | const struct ipv6_txoptions *opt, |
| 747 | struct in6_addr *orig); |
| 748 | |
| 749 | /* |
| 750 | * socket options (ipv6_sockglue.c) |
| 751 | */ |
| 752 | |
| 753 | extern int ipv6_setsockopt(struct sock *sk, int level, |
| 754 | int optname, |
| 755 | char __user *optval, |
| 756 | unsigned int optlen); |
| 757 | extern int ipv6_getsockopt(struct sock *sk, int level, |
| 758 | int optname, |
| 759 | char __user *optval, |
| 760 | int __user *optlen); |
| 761 | extern int compat_ipv6_setsockopt(struct sock *sk, |
| 762 | int level, |
| 763 | int optname, |
| 764 | char __user *optval, |
| 765 | unsigned int optlen); |
| 766 | extern int compat_ipv6_getsockopt(struct sock *sk, |
| 767 | int level, |
| 768 | int optname, |
| 769 | char __user *optval, |
| 770 | int __user *optlen); |
| 771 | |
| 772 | extern int ip6_datagram_connect(struct sock *sk, |
| 773 | struct sockaddr *addr, int addr_len); |
| 774 | |
| 775 | extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len); |
| 776 | extern int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len); |
| 777 | extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, |
| 778 | u32 info, u8 *payload); |
| 779 | extern void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info); |
| 780 | extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu); |
| 781 | |
| 782 | extern int inet6_release(struct socket *sock); |
| 783 | extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, |
| 784 | int addr_len); |
| 785 | extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, |
| 786 | int *uaddr_len, int peer); |
| 787 | extern int inet6_ioctl(struct socket *sock, unsigned int cmd, |
| 788 | unsigned long arg); |
| 789 | |
| 790 | extern int inet6_hash_connect(struct inet_timewait_death_row *death_row, |
| 791 | struct sock *sk); |
| 792 | |
| 793 | /* |
| 794 | * reassembly.c |
| 795 | */ |
| 796 | extern const struct proto_ops inet6_stream_ops; |
| 797 | extern const struct proto_ops inet6_dgram_ops; |
| 798 | |
| 799 | struct group_source_req; |
| 800 | struct group_filter; |
| 801 | |
| 802 | extern int ip6_mc_source(int add, int omode, struct sock *sk, |
| 803 | struct group_source_req *pgsr); |
| 804 | extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf); |
| 805 | extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
| 806 | struct group_filter __user *optval, |
| 807 | int __user *optlen); |
| 808 | extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, |
| 809 | const struct in6_addr *daddr, u32 rnd); |
| 810 | |
| 811 | #ifdef CONFIG_PROC_FS |
| 812 | extern int ac6_proc_init(struct net *net); |
| 813 | extern void ac6_proc_exit(struct net *net); |
| 814 | extern int raw6_proc_init(void); |
| 815 | extern void raw6_proc_exit(void); |
| 816 | extern int tcp6_proc_init(struct net *net); |
| 817 | extern void tcp6_proc_exit(struct net *net); |
| 818 | extern int udp6_proc_init(struct net *net); |
| 819 | extern void udp6_proc_exit(struct net *net); |
| 820 | extern int udplite6_proc_init(void); |
| 821 | extern void udplite6_proc_exit(void); |
| 822 | extern int ipv6_misc_proc_init(void); |
| 823 | extern void ipv6_misc_proc_exit(void); |
| 824 | extern int snmp6_register_dev(struct inet6_dev *idev); |
| 825 | extern int snmp6_unregister_dev(struct inet6_dev *idev); |
| 826 | |
| 827 | #else |
| 828 | static inline int ac6_proc_init(struct net *net) { return 0; } |
| 829 | static inline void ac6_proc_exit(struct net *net) { } |
| 830 | static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } |
| 831 | static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } |
| 832 | #endif |
| 833 | |
| 834 | #ifdef CONFIG_SYSCTL |
| 835 | extern ctl_table ipv6_route_table_template[]; |
| 836 | extern ctl_table ipv6_icmp_table_template[]; |
| 837 | |
| 838 | extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
| 839 | extern struct ctl_table *ipv6_route_sysctl_init(struct net *net); |
| 840 | extern int ipv6_sysctl_register(void); |
| 841 | extern void ipv6_sysctl_unregister(void); |
| 842 | #endif |
| 843 | |
| 844 | #endif /* _NET_IPV6_H */ |