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0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 /*
0003  *  Linux INET6 implementation
0004  *
0005  *  Authors:
0006  *  Pedro Roque     <roque@di.fc.ul.pt>
0007  */
0008 
0009 #ifndef _NET_IPV6_H
0010 #define _NET_IPV6_H
0011 
0012 #include <linux/ipv6.h>
0013 #include <linux/hardirq.h>
0014 #include <linux/jhash.h>
0015 #include <linux/refcount.h>
0016 #include <linux/jump_label_ratelimit.h>
0017 #include <net/if_inet6.h>
0018 #include <net/flow.h>
0019 #include <net/flow_dissector.h>
0020 #include <net/inet_dscp.h>
0021 #include <net/snmp.h>
0022 #include <net/netns/hash.h>
0023 
0024 struct ip_tunnel_info;
0025 
0026 #define SIN6_LEN_RFC2133    24
0027 
0028 #define IPV6_MAXPLEN        65535
0029 
0030 /*
0031  *  NextHeader field of IPv6 header
0032  */
0033 
0034 #define NEXTHDR_HOP     0   /* Hop-by-hop option header. */
0035 #define NEXTHDR_IPV4        4   /* IPv4 in IPv6 */
0036 #define NEXTHDR_TCP     6   /* TCP segment. */
0037 #define NEXTHDR_UDP     17  /* UDP message. */
0038 #define NEXTHDR_IPV6        41  /* IPv6 in IPv6 */
0039 #define NEXTHDR_ROUTING     43  /* Routing header. */
0040 #define NEXTHDR_FRAGMENT    44  /* Fragmentation/reassembly header. */
0041 #define NEXTHDR_GRE     47  /* GRE header. */
0042 #define NEXTHDR_ESP     50  /* Encapsulating security payload. */
0043 #define NEXTHDR_AUTH        51  /* Authentication header. */
0044 #define NEXTHDR_ICMP        58  /* ICMP for IPv6. */
0045 #define NEXTHDR_NONE        59  /* No next header */
0046 #define NEXTHDR_DEST        60  /* Destination options header. */
0047 #define NEXTHDR_SCTP        132 /* SCTP message. */
0048 #define NEXTHDR_MOBILITY    135 /* Mobility header. */
0049 
0050 #define NEXTHDR_MAX     255
0051 
0052 #define IPV6_DEFAULT_HOPLIMIT   64
0053 #define IPV6_DEFAULT_MCASTHOPS  1
0054 
0055 /* Limits on Hop-by-Hop and Destination options.
0056  *
0057  * Per RFC8200 there is no limit on the maximum number or lengths of options in
0058  * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
0059  * We allow configurable limits in order to mitigate potential denial of
0060  * service attacks.
0061  *
0062  * There are three limits that may be set:
0063  *   - Limit the number of options in a Hop-by-Hop or Destination options
0064  *     extension header
0065  *   - Limit the byte length of a Hop-by-Hop or Destination options extension
0066  *     header
0067  *   - Disallow unknown options
0068  *
0069  * The limits are expressed in corresponding sysctls:
0070  *
0071  * ipv6.sysctl.max_dst_opts_cnt
0072  * ipv6.sysctl.max_hbh_opts_cnt
0073  * ipv6.sysctl.max_dst_opts_len
0074  * ipv6.sysctl.max_hbh_opts_len
0075  *
0076  * max_*_opts_cnt is the number of TLVs that are allowed for Destination
0077  * options or Hop-by-Hop options. If the number is less than zero then unknown
0078  * TLVs are disallowed and the number of known options that are allowed is the
0079  * absolute value. Setting the value to INT_MAX indicates no limit.
0080  *
0081  * max_*_opts_len is the length limit in bytes of a Destination or
0082  * Hop-by-Hop options extension header. Setting the value to INT_MAX
0083  * indicates no length limit.
0084  *
0085  * If a limit is exceeded when processing an extension header the packet is
0086  * silently discarded.
0087  */
0088 
0089 /* Default limits for Hop-by-Hop and Destination options */
0090 #define IP6_DEFAULT_MAX_DST_OPTS_CNT     8
0091 #define IP6_DEFAULT_MAX_HBH_OPTS_CNT     8
0092 #define IP6_DEFAULT_MAX_DST_OPTS_LEN     INT_MAX /* No limit */
0093 #define IP6_DEFAULT_MAX_HBH_OPTS_LEN     INT_MAX /* No limit */
0094 
0095 /*
0096  *  Addr type
0097  *  
0098  *  type    -   unicast | multicast
0099  *  scope   -   local   | site      | global
0100  *  v4  -   compat
0101  *  v4mapped
0102  *  any
0103  *  loopback
0104  */
0105 
0106 #define IPV6_ADDR_ANY       0x0000U
0107 
0108 #define IPV6_ADDR_UNICAST   0x0001U
0109 #define IPV6_ADDR_MULTICAST 0x0002U
0110 
0111 #define IPV6_ADDR_LOOPBACK  0x0010U
0112 #define IPV6_ADDR_LINKLOCAL 0x0020U
0113 #define IPV6_ADDR_SITELOCAL 0x0040U
0114 
0115 #define IPV6_ADDR_COMPATv4  0x0080U
0116 
0117 #define IPV6_ADDR_SCOPE_MASK    0x00f0U
0118 
0119 #define IPV6_ADDR_MAPPED    0x1000U
0120 
0121 /*
0122  *  Addr scopes
0123  */
0124 #define IPV6_ADDR_MC_SCOPE(a)   \
0125     ((a)->s6_addr[1] & 0x0f)    /* nonstandard */
0126 #define __IPV6_ADDR_SCOPE_INVALID   -1
0127 #define IPV6_ADDR_SCOPE_NODELOCAL   0x01
0128 #define IPV6_ADDR_SCOPE_LINKLOCAL   0x02
0129 #define IPV6_ADDR_SCOPE_SITELOCAL   0x05
0130 #define IPV6_ADDR_SCOPE_ORGLOCAL    0x08
0131 #define IPV6_ADDR_SCOPE_GLOBAL      0x0e
0132 
0133 /*
0134  *  Addr flags
0135  */
0136 #define IPV6_ADDR_MC_FLAG_TRANSIENT(a)  \
0137     ((a)->s6_addr[1] & 0x10)
0138 #define IPV6_ADDR_MC_FLAG_PREFIX(a) \
0139     ((a)->s6_addr[1] & 0x20)
0140 #define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
0141     ((a)->s6_addr[1] & 0x40)
0142 
0143 /*
0144  *  fragmentation header
0145  */
0146 
0147 struct frag_hdr {
0148     __u8    nexthdr;
0149     __u8    reserved;
0150     __be16  frag_off;
0151     __be32  identification;
0152 };
0153 
0154 /*
0155  * Jumbo payload option, as described in RFC 2675 2.
0156  */
0157 struct hop_jumbo_hdr {
0158     u8  nexthdr;
0159     u8  hdrlen;
0160     u8  tlv_type;   /* IPV6_TLV_JUMBO, 0xC2 */
0161     u8  tlv_len;    /* 4 */
0162     __be32  jumbo_payload_len;
0163 };
0164 
0165 #define IP6_MF      0x0001
0166 #define IP6_OFFSET  0xFFF8
0167 
0168 struct ip6_fraglist_iter {
0169     struct ipv6hdr  *tmp_hdr;
0170     struct sk_buff  *frag;
0171     int     offset;
0172     unsigned int    hlen;
0173     __be32      frag_id;
0174     u8      nexthdr;
0175 };
0176 
0177 int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
0178               u8 nexthdr, __be32 frag_id,
0179               struct ip6_fraglist_iter *iter);
0180 void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
0181 
0182 static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
0183 {
0184     struct sk_buff *skb = iter->frag;
0185 
0186     iter->frag = skb->next;
0187     skb_mark_not_on_list(skb);
0188 
0189     return skb;
0190 }
0191 
0192 struct ip6_frag_state {
0193     u8      *prevhdr;
0194     unsigned int    hlen;
0195     unsigned int    mtu;
0196     unsigned int    left;
0197     int     offset;
0198     int     ptr;
0199     int     hroom;
0200     int     troom;
0201     __be32      frag_id;
0202     u8      nexthdr;
0203 };
0204 
0205 void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
0206            unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
0207            u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
0208 struct sk_buff *ip6_frag_next(struct sk_buff *skb,
0209                   struct ip6_frag_state *state);
0210 
0211 #define IP6_REPLY_MARK(net, mark) \
0212     ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
0213 
0214 #include <net/sock.h>
0215 
0216 /* sysctls */
0217 extern int sysctl_mld_max_msf;
0218 extern int sysctl_mld_qrv;
0219 
0220 #define _DEVINC(net, statname, mod, idev, field)            \
0221 ({                                  \
0222     struct inet6_dev *_idev = (idev);               \
0223     if (likely(_idev != NULL))                  \
0224         mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
0225     mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
0226 })
0227 
0228 /* per device counters are atomic_long_t */
0229 #define _DEVINCATOMIC(net, statname, mod, idev, field)          \
0230 ({                                  \
0231     struct inet6_dev *_idev = (idev);               \
0232     if (likely(_idev != NULL))                  \
0233         SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
0234     mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
0235 })
0236 
0237 /* per device and per net counters are atomic_long_t */
0238 #define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field)       \
0239 ({                                  \
0240     struct inet6_dev *_idev = (idev);               \
0241     if (likely(_idev != NULL))                  \
0242         SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
0243     SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
0244 })
0245 
0246 #define _DEVADD(net, statname, mod, idev, field, val)           \
0247 ({                                  \
0248     struct inet6_dev *_idev = (idev);               \
0249     if (likely(_idev != NULL))                  \
0250         mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
0251     mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
0252 })
0253 
0254 #define _DEVUPD(net, statname, mod, idev, field, val)           \
0255 ({                                  \
0256     struct inet6_dev *_idev = (idev);               \
0257     if (likely(_idev != NULL))                  \
0258         mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
0259     mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
0260 })
0261 
0262 /* MIBs */
0263 
0264 #define IP6_INC_STATS(net, idev,field)      \
0265         _DEVINC(net, ipv6, , idev, field)
0266 #define __IP6_INC_STATS(net, idev,field)    \
0267         _DEVINC(net, ipv6, __, idev, field)
0268 #define IP6_ADD_STATS(net, idev,field,val)  \
0269         _DEVADD(net, ipv6, , idev, field, val)
0270 #define __IP6_ADD_STATS(net, idev,field,val)    \
0271         _DEVADD(net, ipv6, __, idev, field, val)
0272 #define IP6_UPD_PO_STATS(net, idev,field,val)   \
0273         _DEVUPD(net, ipv6, , idev, field, val)
0274 #define __IP6_UPD_PO_STATS(net, idev,field,val)   \
0275         _DEVUPD(net, ipv6, __, idev, field, val)
0276 #define ICMP6_INC_STATS(net, idev, field)   \
0277         _DEVINCATOMIC(net, icmpv6, , idev, field)
0278 #define __ICMP6_INC_STATS(net, idev, field) \
0279         _DEVINCATOMIC(net, icmpv6, __, idev, field)
0280 
0281 #define ICMP6MSGOUT_INC_STATS(net, idev, field)     \
0282     _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
0283 #define ICMP6MSGIN_INC_STATS(net, idev, field)  \
0284     _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
0285 
0286 struct ip6_ra_chain {
0287     struct ip6_ra_chain *next;
0288     struct sock     *sk;
0289     int         sel;
0290     void            (*destructor)(struct sock *);
0291 };
0292 
0293 extern struct ip6_ra_chain  *ip6_ra_chain;
0294 extern rwlock_t ip6_ra_lock;
0295 
0296 /*
0297    This structure is prepared by protocol, when parsing
0298    ancillary data and passed to IPv6.
0299  */
0300 
0301 struct ipv6_txoptions {
0302     refcount_t      refcnt;
0303     /* Length of this structure */
0304     int         tot_len;
0305 
0306     /* length of extension headers   */
0307 
0308     __u16           opt_flen;   /* after fragment hdr */
0309     __u16           opt_nflen;  /* before fragment hdr */
0310 
0311     struct ipv6_opt_hdr *hopopt;
0312     struct ipv6_opt_hdr *dst0opt;
0313     struct ipv6_rt_hdr  *srcrt; /* Routing Header */
0314     struct ipv6_opt_hdr *dst1opt;
0315     struct rcu_head     rcu;
0316     /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
0317 };
0318 
0319 /* flowlabel_reflect sysctl values */
0320 enum flowlabel_reflect {
0321     FLOWLABEL_REFLECT_ESTABLISHED       = 1,
0322     FLOWLABEL_REFLECT_TCP_RESET     = 2,
0323     FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES   = 4,
0324 };
0325 
0326 struct ip6_flowlabel {
0327     struct ip6_flowlabel __rcu *next;
0328     __be32          label;
0329     atomic_t        users;
0330     struct in6_addr     dst;
0331     struct ipv6_txoptions   *opt;
0332     unsigned long       linger;
0333     struct rcu_head     rcu;
0334     u8          share;
0335     union {
0336         struct pid *pid;
0337         kuid_t uid;
0338     } owner;
0339     unsigned long       lastuse;
0340     unsigned long       expires;
0341     struct net      *fl_net;
0342 };
0343 
0344 #define IPV6_FLOWINFO_MASK      cpu_to_be32(0x0FFFFFFF)
0345 #define IPV6_FLOWLABEL_MASK     cpu_to_be32(0x000FFFFF)
0346 #define IPV6_FLOWLABEL_STATELESS_FLAG   cpu_to_be32(0x00080000)
0347 
0348 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
0349 #define IPV6_TCLASS_SHIFT   20
0350 
0351 struct ipv6_fl_socklist {
0352     struct ipv6_fl_socklist __rcu   *next;
0353     struct ip6_flowlabel        *fl;
0354     struct rcu_head         rcu;
0355 };
0356 
0357 struct ipcm6_cookie {
0358     struct sockcm_cookie sockc;
0359     __s16 hlimit;
0360     __s16 tclass;
0361     __u16 gso_size;
0362     __s8  dontfrag;
0363     struct ipv6_txoptions *opt;
0364 };
0365 
0366 static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
0367 {
0368     *ipc6 = (struct ipcm6_cookie) {
0369         .hlimit = -1,
0370         .tclass = -1,
0371         .dontfrag = -1,
0372     };
0373 }
0374 
0375 static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
0376                  const struct ipv6_pinfo *np)
0377 {
0378     *ipc6 = (struct ipcm6_cookie) {
0379         .hlimit = -1,
0380         .tclass = np->tclass,
0381         .dontfrag = np->dontfrag,
0382     };
0383 }
0384 
0385 static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
0386 {
0387     struct ipv6_txoptions *opt;
0388 
0389     rcu_read_lock();
0390     opt = rcu_dereference(np->opt);
0391     if (opt) {
0392         if (!refcount_inc_not_zero(&opt->refcnt))
0393             opt = NULL;
0394         else
0395             opt = rcu_pointer_handoff(opt);
0396     }
0397     rcu_read_unlock();
0398     return opt;
0399 }
0400 
0401 static inline void txopt_put(struct ipv6_txoptions *opt)
0402 {
0403     if (opt && refcount_dec_and_test(&opt->refcnt))
0404         kfree_rcu(opt, rcu);
0405 }
0406 
0407 #if IS_ENABLED(CONFIG_IPV6)
0408 struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
0409 
0410 extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
0411 static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
0412                             __be32 label)
0413 {
0414     if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) &&
0415         READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
0416         return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
0417 
0418     return NULL;
0419 }
0420 #endif
0421 
0422 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
0423                      struct ip6_flowlabel *fl,
0424                      struct ipv6_txoptions *fopt);
0425 void fl6_free_socklist(struct sock *sk);
0426 int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);
0427 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
0428                int flags);
0429 int ip6_flowlabel_init(void);
0430 void ip6_flowlabel_cleanup(void);
0431 bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
0432 
0433 static inline void fl6_sock_release(struct ip6_flowlabel *fl)
0434 {
0435     if (fl)
0436         atomic_dec(&fl->users);
0437 }
0438 
0439 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
0440 
0441 void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
0442                 struct icmp6hdr *thdr, int len);
0443 
0444 int ip6_ra_control(struct sock *sk, int sel);
0445 
0446 int ipv6_parse_hopopts(struct sk_buff *skb);
0447 
0448 struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
0449                     struct ipv6_txoptions *opt);
0450 struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
0451                       struct ipv6_txoptions *opt,
0452                       int newtype,
0453                       struct ipv6_opt_hdr *newopt);
0454 struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space,
0455                         struct ipv6_txoptions *opt);
0456 
0457 static inline struct ipv6_txoptions *
0458 ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt)
0459 {
0460     if (!opt)
0461         return NULL;
0462     return __ipv6_fixup_options(opt_space, opt);
0463 }
0464 
0465 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
0466                const struct inet6_skb_parm *opt);
0467 struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
0468                        struct ipv6_txoptions *opt);
0469 
0470 /* This helper is specialized for BIG TCP needs.
0471  * It assumes the hop_jumbo_hdr will immediately follow the IPV6 header.
0472  * It assumes headers are already in skb->head.
0473  * Returns 0, or IPPROTO_TCP if a BIG TCP packet is there.
0474  */
0475 static inline int ipv6_has_hopopt_jumbo(const struct sk_buff *skb)
0476 {
0477     const struct hop_jumbo_hdr *jhdr;
0478     const struct ipv6hdr *nhdr;
0479 
0480     if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))
0481         return 0;
0482 
0483     if (skb->protocol != htons(ETH_P_IPV6))
0484         return 0;
0485 
0486     if (skb_network_offset(skb) +
0487         sizeof(struct ipv6hdr) +
0488         sizeof(struct hop_jumbo_hdr) > skb_headlen(skb))
0489         return 0;
0490 
0491     nhdr = ipv6_hdr(skb);
0492 
0493     if (nhdr->nexthdr != NEXTHDR_HOP)
0494         return 0;
0495 
0496     jhdr = (const struct hop_jumbo_hdr *) (nhdr + 1);
0497     if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||
0498         jhdr->nexthdr != IPPROTO_TCP)
0499         return 0;
0500     return jhdr->nexthdr;
0501 }
0502 
0503 static inline bool ipv6_accept_ra(struct inet6_dev *idev)
0504 {
0505     /* If forwarding is enabled, RA are not accepted unless the special
0506      * hybrid mode (accept_ra=2) is enabled.
0507      */
0508     return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
0509         idev->cnf.accept_ra;
0510 }
0511 
0512 #define IPV6_FRAG_HIGH_THRESH   (4 * 1024*1024) /* 4194304 */
0513 #define IPV6_FRAG_LOW_THRESH    (3 * 1024*1024) /* 3145728 */
0514 #define IPV6_FRAG_TIMEOUT   (60 * HZ)   /* 60 seconds */
0515 
0516 int __ipv6_addr_type(const struct in6_addr *addr);
0517 static inline int ipv6_addr_type(const struct in6_addr *addr)
0518 {
0519     return __ipv6_addr_type(addr) & 0xffff;
0520 }
0521 
0522 static inline int ipv6_addr_scope(const struct in6_addr *addr)
0523 {
0524     return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
0525 }
0526 
0527 static inline int __ipv6_addr_src_scope(int type)
0528 {
0529     return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
0530 }
0531 
0532 static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
0533 {
0534     return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
0535 }
0536 
0537 static inline bool __ipv6_addr_needs_scope_id(int type)
0538 {
0539     return type & IPV6_ADDR_LINKLOCAL ||
0540            (type & IPV6_ADDR_MULTICAST &&
0541         (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
0542 }
0543 
0544 static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
0545 {
0546     return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
0547 }
0548 
0549 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
0550 {
0551     return memcmp(a1, a2, sizeof(struct in6_addr));
0552 }
0553 
0554 static inline bool
0555 ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
0556              const struct in6_addr *a2)
0557 {
0558 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0559     const unsigned long *ul1 = (const unsigned long *)a1;
0560     const unsigned long *ulm = (const unsigned long *)m;
0561     const unsigned long *ul2 = (const unsigned long *)a2;
0562 
0563     return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
0564           ((ul1[1] ^ ul2[1]) & ulm[1]));
0565 #else
0566     return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
0567           ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
0568           ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
0569           ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
0570 #endif
0571 }
0572 
0573 static inline void ipv6_addr_prefix(struct in6_addr *pfx,
0574                     const struct in6_addr *addr,
0575                     int plen)
0576 {
0577     /* caller must guarantee 0 <= plen <= 128 */
0578     int o = plen >> 3,
0579         b = plen & 0x7;
0580 
0581     memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
0582     memcpy(pfx->s6_addr, addr, o);
0583     if (b != 0)
0584         pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
0585 }
0586 
0587 static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
0588                      const struct in6_addr *pfx,
0589                      int plen)
0590 {
0591     /* caller must guarantee 0 <= plen <= 128 */
0592     int o = plen >> 3,
0593         b = plen & 0x7;
0594 
0595     memcpy(addr->s6_addr, pfx, o);
0596     if (b != 0) {
0597         addr->s6_addr[o] &= ~(0xff00 >> b);
0598         addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
0599     }
0600 }
0601 
0602 static inline void __ipv6_addr_set_half(__be32 *addr,
0603                     __be32 wh, __be32 wl)
0604 {
0605 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0606 #if defined(__BIG_ENDIAN)
0607     if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
0608         *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
0609         return;
0610     }
0611 #elif defined(__LITTLE_ENDIAN)
0612     if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
0613         *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
0614         return;
0615     }
0616 #endif
0617 #endif
0618     addr[0] = wh;
0619     addr[1] = wl;
0620 }
0621 
0622 static inline void ipv6_addr_set(struct in6_addr *addr,
0623                      __be32 w1, __be32 w2,
0624                      __be32 w3, __be32 w4)
0625 {
0626     __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
0627     __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
0628 }
0629 
0630 static inline bool ipv6_addr_equal(const struct in6_addr *a1,
0631                    const struct in6_addr *a2)
0632 {
0633 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0634     const unsigned long *ul1 = (const unsigned long *)a1;
0635     const unsigned long *ul2 = (const unsigned long *)a2;
0636 
0637     return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
0638 #else
0639     return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |
0640         (a1->s6_addr32[1] ^ a2->s6_addr32[1]) |
0641         (a1->s6_addr32[2] ^ a2->s6_addr32[2]) |
0642         (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;
0643 #endif
0644 }
0645 
0646 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0647 static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
0648                           const __be64 *a2,
0649                           unsigned int len)
0650 {
0651     if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
0652         return false;
0653     return true;
0654 }
0655 
0656 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
0657                      const struct in6_addr *addr2,
0658                      unsigned int prefixlen)
0659 {
0660     const __be64 *a1 = (const __be64 *)addr1;
0661     const __be64 *a2 = (const __be64 *)addr2;
0662 
0663     if (prefixlen >= 64) {
0664         if (a1[0] ^ a2[0])
0665             return false;
0666         return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
0667     }
0668     return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
0669 }
0670 #else
0671 static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
0672                      const struct in6_addr *addr2,
0673                      unsigned int prefixlen)
0674 {
0675     const __be32 *a1 = addr1->s6_addr32;
0676     const __be32 *a2 = addr2->s6_addr32;
0677     unsigned int pdw, pbi;
0678 
0679     /* check complete u32 in prefix */
0680     pdw = prefixlen >> 5;
0681     if (pdw && memcmp(a1, a2, pdw << 2))
0682         return false;
0683 
0684     /* check incomplete u32 in prefix */
0685     pbi = prefixlen & 0x1f;
0686     if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
0687         return false;
0688 
0689     return true;
0690 }
0691 #endif
0692 
0693 static inline bool ipv6_addr_any(const struct in6_addr *a)
0694 {
0695 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0696     const unsigned long *ul = (const unsigned long *)a;
0697 
0698     return (ul[0] | ul[1]) == 0UL;
0699 #else
0700     return (a->s6_addr32[0] | a->s6_addr32[1] |
0701         a->s6_addr32[2] | a->s6_addr32[3]) == 0;
0702 #endif
0703 }
0704 
0705 static inline u32 ipv6_addr_hash(const struct in6_addr *a)
0706 {
0707 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0708     const unsigned long *ul = (const unsigned long *)a;
0709     unsigned long x = ul[0] ^ ul[1];
0710 
0711     return (u32)(x ^ (x >> 32));
0712 #else
0713     return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
0714                  a->s6_addr32[2] ^ a->s6_addr32[3]);
0715 #endif
0716 }
0717 
0718 /* more secured version of ipv6_addr_hash() */
0719 static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
0720 {
0721     u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
0722 
0723     return jhash_3words(v,
0724                 (__force u32)a->s6_addr32[2],
0725                 (__force u32)a->s6_addr32[3],
0726                 initval);
0727 }
0728 
0729 static inline bool ipv6_addr_loopback(const struct in6_addr *a)
0730 {
0731 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0732     const __be64 *be = (const __be64 *)a;
0733 
0734     return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
0735 #else
0736     return (a->s6_addr32[0] | a->s6_addr32[1] |
0737         a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
0738 #endif
0739 }
0740 
0741 /*
0742  * Note that we must __force cast these to unsigned long to make sparse happy,
0743  * since all of the endian-annotated types are fixed size regardless of arch.
0744  */
0745 static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
0746 {
0747     return (
0748 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0749         *(unsigned long *)a |
0750 #else
0751         (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
0752 #endif
0753         (__force unsigned long)(a->s6_addr32[2] ^
0754                     cpu_to_be32(0x0000ffff))) == 0UL;
0755 }
0756 
0757 static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
0758 {
0759     return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
0760 }
0761 
0762 static inline u32 ipv6_portaddr_hash(const struct net *net,
0763                      const struct in6_addr *addr6,
0764                      unsigned int port)
0765 {
0766     unsigned int hash, mix = net_hash_mix(net);
0767 
0768     if (ipv6_addr_any(addr6))
0769         hash = jhash_1word(0, mix);
0770     else if (ipv6_addr_v4mapped(addr6))
0771         hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
0772     else
0773         hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
0774 
0775     return hash ^ port;
0776 }
0777 
0778 /*
0779  * Check for a RFC 4843 ORCHID address
0780  * (Overlay Routable Cryptographic Hash Identifiers)
0781  */
0782 static inline bool ipv6_addr_orchid(const struct in6_addr *a)
0783 {
0784     return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
0785 }
0786 
0787 static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
0788 {
0789     return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
0790 }
0791 
0792 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
0793                       struct in6_addr *v4mapped)
0794 {
0795     ipv6_addr_set(v4mapped,
0796             0, 0,
0797             htonl(0x0000FFFF),
0798             addr);
0799 }
0800 
0801 /*
0802  * find the first different bit between two addresses
0803  * length of address must be a multiple of 32bits
0804  */
0805 static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
0806 {
0807     const __be32 *a1 = token1, *a2 = token2;
0808     int i;
0809 
0810     addrlen >>= 2;
0811 
0812     for (i = 0; i < addrlen; i++) {
0813         __be32 xb = a1[i] ^ a2[i];
0814         if (xb)
0815             return i * 32 + 31 - __fls(ntohl(xb));
0816     }
0817 
0818     /*
0819      *  we should *never* get to this point since that
0820      *  would mean the addrs are equal
0821      *
0822      *  However, we do get to it 8) And exacly, when
0823      *  addresses are equal 8)
0824      *
0825      *  ip route add 1111::/128 via ...
0826      *  ip route add 1111::/64 via ...
0827      *  and we are here.
0828      *
0829      *  Ideally, this function should stop comparison
0830      *  at prefix length. It does not, but it is still OK,
0831      *  if returned value is greater than prefix length.
0832      *                  --ANK (980803)
0833      */
0834     return addrlen << 5;
0835 }
0836 
0837 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0838 static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
0839 {
0840     const __be64 *a1 = token1, *a2 = token2;
0841     int i;
0842 
0843     addrlen >>= 3;
0844 
0845     for (i = 0; i < addrlen; i++) {
0846         __be64 xb = a1[i] ^ a2[i];
0847         if (xb)
0848             return i * 64 + 63 - __fls(be64_to_cpu(xb));
0849     }
0850 
0851     return addrlen << 6;
0852 }
0853 #endif
0854 
0855 static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
0856 {
0857 #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
0858     if (__builtin_constant_p(addrlen) && !(addrlen & 7))
0859         return __ipv6_addr_diff64(token1, token2, addrlen);
0860 #endif
0861     return __ipv6_addr_diff32(token1, token2, addrlen);
0862 }
0863 
0864 static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
0865 {
0866     return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
0867 }
0868 
0869 __be32 ipv6_select_ident(struct net *net,
0870              const struct in6_addr *daddr,
0871              const struct in6_addr *saddr);
0872 __be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
0873 
0874 int ip6_dst_hoplimit(struct dst_entry *dst);
0875 
0876 static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
0877                       struct dst_entry *dst)
0878 {
0879     int hlimit;
0880 
0881     if (ipv6_addr_is_multicast(&fl6->daddr))
0882         hlimit = np->mcast_hops;
0883     else
0884         hlimit = np->hop_limit;
0885     if (hlimit < 0)
0886         hlimit = ip6_dst_hoplimit(dst);
0887     return hlimit;
0888 }
0889 
0890 /* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
0891  * Equivalent to :  flow->v6addrs.src = iph->saddr;
0892  *          flow->v6addrs.dst = iph->daddr;
0893  */
0894 static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
0895                         const struct ipv6hdr *iph)
0896 {
0897     BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
0898              offsetof(typeof(flow->addrs), v6addrs.src) +
0899              sizeof(flow->addrs.v6addrs.src));
0900     memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
0901     flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
0902 }
0903 
0904 #if IS_ENABLED(CONFIG_IPV6)
0905 
0906 static inline bool ipv6_can_nonlocal_bind(struct net *net,
0907                       struct inet_sock *inet)
0908 {
0909     return net->ipv6.sysctl.ip_nonlocal_bind ||
0910         inet->freebind || inet->transparent;
0911 }
0912 
0913 /* Sysctl settings for net ipv6.auto_flowlabels */
0914 #define IP6_AUTO_FLOW_LABEL_OFF     0
0915 #define IP6_AUTO_FLOW_LABEL_OPTOUT  1
0916 #define IP6_AUTO_FLOW_LABEL_OPTIN   2
0917 #define IP6_AUTO_FLOW_LABEL_FORCED  3
0918 
0919 #define IP6_AUTO_FLOW_LABEL_MAX     IP6_AUTO_FLOW_LABEL_FORCED
0920 
0921 #define IP6_DEFAULT_AUTO_FLOW_LABELS    IP6_AUTO_FLOW_LABEL_OPTOUT
0922 
0923 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
0924                     __be32 flowlabel, bool autolabel,
0925                     struct flowi6 *fl6)
0926 {
0927     u32 hash;
0928 
0929     /* @flowlabel may include more than a flow label, eg, the traffic class.
0930      * Here we want only the flow label value.
0931      */
0932     flowlabel &= IPV6_FLOWLABEL_MASK;
0933 
0934     if (flowlabel ||
0935         net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
0936         (!autolabel &&
0937          net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
0938         return flowlabel;
0939 
0940     hash = skb_get_hash_flowi6(skb, fl6);
0941 
0942     /* Since this is being sent on the wire obfuscate hash a bit
0943      * to minimize possbility that any useful information to an
0944      * attacker is leaked. Only lower 20 bits are relevant.
0945      */
0946     hash = rol32(hash, 16);
0947 
0948     flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
0949 
0950     if (net->ipv6.sysctl.flowlabel_state_ranges)
0951         flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
0952 
0953     return flowlabel;
0954 }
0955 
0956 static inline int ip6_default_np_autolabel(struct net *net)
0957 {
0958     switch (net->ipv6.sysctl.auto_flowlabels) {
0959     case IP6_AUTO_FLOW_LABEL_OFF:
0960     case IP6_AUTO_FLOW_LABEL_OPTIN:
0961     default:
0962         return 0;
0963     case IP6_AUTO_FLOW_LABEL_OPTOUT:
0964     case IP6_AUTO_FLOW_LABEL_FORCED:
0965         return 1;
0966     }
0967 }
0968 #else
0969 static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
0970                     __be32 flowlabel, bool autolabel,
0971                     struct flowi6 *fl6)
0972 {
0973     return flowlabel;
0974 }
0975 static inline int ip6_default_np_autolabel(struct net *net)
0976 {
0977     return 0;
0978 }
0979 #endif
0980 
0981 #if IS_ENABLED(CONFIG_IPV6)
0982 static inline int ip6_multipath_hash_policy(const struct net *net)
0983 {
0984     return net->ipv6.sysctl.multipath_hash_policy;
0985 }
0986 static inline u32 ip6_multipath_hash_fields(const struct net *net)
0987 {
0988     return net->ipv6.sysctl.multipath_hash_fields;
0989 }
0990 #else
0991 static inline int ip6_multipath_hash_policy(const struct net *net)
0992 {
0993     return 0;
0994 }
0995 static inline u32 ip6_multipath_hash_fields(const struct net *net)
0996 {
0997     return 0;
0998 }
0999 #endif
1000 
1001 /*
1002  *  Header manipulation
1003  */
1004 static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
1005                 __be32 flowlabel)
1006 {
1007     *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
1008 }
1009 
1010 static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
1011 {
1012     return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
1013 }
1014 
1015 static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
1016 {
1017     return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
1018 }
1019 
1020 static inline u8 ip6_tclass(__be32 flowinfo)
1021 {
1022     return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
1023 }
1024 
1025 static inline dscp_t ip6_dscp(__be32 flowinfo)
1026 {
1027     return inet_dsfield_to_dscp(ip6_tclass(flowinfo));
1028 }
1029 
1030 static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
1031 {
1032     return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
1033 }
1034 
1035 static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
1036 {
1037     return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
1038 }
1039 
1040 /*
1041  *  Prototypes exported by ipv6
1042  */
1043 
1044 /*
1045  *  rcv function (called from netdevice level)
1046  */
1047 
1048 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
1049          struct packet_type *pt, struct net_device *orig_dev);
1050 void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
1051            struct net_device *orig_dev);
1052 
1053 int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
1054 
1055 /*
1056  *  upper-layer output functions
1057  */
1058 int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
1059          __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
1060 
1061 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
1062 
1063 int ip6_append_data(struct sock *sk,
1064             int getfrag(void *from, char *to, int offset, int len,
1065                 int odd, struct sk_buff *skb),
1066             void *from, size_t length, int transhdrlen,
1067             struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
1068             struct rt6_info *rt, unsigned int flags);
1069 
1070 int ip6_push_pending_frames(struct sock *sk);
1071 
1072 void ip6_flush_pending_frames(struct sock *sk);
1073 
1074 int ip6_send_skb(struct sk_buff *skb);
1075 
1076 struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
1077                    struct inet_cork_full *cork,
1078                    struct inet6_cork *v6_cork);
1079 struct sk_buff *ip6_make_skb(struct sock *sk,
1080                  int getfrag(void *from, char *to, int offset,
1081                      int len, int odd, struct sk_buff *skb),
1082                  void *from, size_t length, int transhdrlen,
1083                  struct ipcm6_cookie *ipc6,
1084                  struct rt6_info *rt, unsigned int flags,
1085                  struct inet_cork_full *cork);
1086 
1087 static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
1088 {
1089     return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
1090                   &inet6_sk(sk)->cork);
1091 }
1092 
1093 int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
1094            struct flowi6 *fl6);
1095 struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1096                       const struct in6_addr *final_dst);
1097 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1098                      const struct in6_addr *final_dst,
1099                      bool connected);
1100 struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
1101                     struct net_device *dev,
1102                     struct net *net, struct socket *sock,
1103                     struct in6_addr *saddr,
1104                     const struct ip_tunnel_info *info,
1105                     u8 protocol, bool use_cache);
1106 struct dst_entry *ip6_blackhole_route(struct net *net,
1107                       struct dst_entry *orig_dst);
1108 
1109 /*
1110  *  skb processing functions
1111  */
1112 
1113 int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1114 int ip6_forward(struct sk_buff *skb);
1115 int ip6_input(struct sk_buff *skb);
1116 int ip6_mc_input(struct sk_buff *skb);
1117 void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
1118                   bool have_final);
1119 
1120 int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1121 int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1122 
1123 /*
1124  *  Extension header (options) processing
1125  */
1126 
1127 void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1128               u8 *proto, struct in6_addr **daddr_p,
1129               struct in6_addr *saddr);
1130 void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1131              u8 *proto);
1132 
1133 int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
1134              __be16 *frag_offp);
1135 
1136 bool ipv6_ext_hdr(u8 nexthdr);
1137 
1138 enum {
1139     IP6_FH_F_FRAG       = (1 << 0),
1140     IP6_FH_F_AUTH       = (1 << 1),
1141     IP6_FH_F_SKIP_RH    = (1 << 2),
1142 };
1143 
1144 /* find specified header and get offset to it */
1145 int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
1146           unsigned short *fragoff, int *fragflg);
1147 
1148 int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1149 
1150 struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
1151                 const struct ipv6_txoptions *opt,
1152                 struct in6_addr *orig);
1153 
1154 /*
1155  *  socket options (ipv6_sockglue.c)
1156  */
1157 DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
1158 
1159 int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1160             unsigned int optlen);
1161 int ipv6_getsockopt(struct sock *sk, int level, int optname,
1162             char __user *optval, int __user *optlen);
1163 
1164 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
1165                int addr_len);
1166 int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1167 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
1168                  int addr_len);
1169 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1170 void ip6_datagram_release_cb(struct sock *sk);
1171 
1172 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
1173             int *addr_len);
1174 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
1175              int *addr_len);
1176 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
1177              u32 info, u8 *payload);
1178 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
1179 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
1180 
1181 int inet6_release(struct socket *sock);
1182 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1183 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1184           int peer);
1185 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1186 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
1187         unsigned long arg);
1188 
1189 int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1190                   struct sock *sk);
1191 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
1192 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
1193           int flags);
1194 
1195 /*
1196  * reassembly.c
1197  */
1198 extern const struct proto_ops inet6_stream_ops;
1199 extern const struct proto_ops inet6_dgram_ops;
1200 extern const struct proto_ops inet6_sockraw_ops;
1201 
1202 struct group_source_req;
1203 struct group_filter;
1204 
1205 int ip6_mc_source(int add, int omode, struct sock *sk,
1206           struct group_source_req *pgsr);
1207 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
1208           struct sockaddr_storage *list);
1209 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1210           struct sockaddr_storage __user *p);
1211 
1212 #ifdef CONFIG_PROC_FS
1213 int ac6_proc_init(struct net *net);
1214 void ac6_proc_exit(struct net *net);
1215 int raw6_proc_init(void);
1216 void raw6_proc_exit(void);
1217 int tcp6_proc_init(struct net *net);
1218 void tcp6_proc_exit(struct net *net);
1219 int udp6_proc_init(struct net *net);
1220 void udp6_proc_exit(struct net *net);
1221 int udplite6_proc_init(void);
1222 void udplite6_proc_exit(void);
1223 int ipv6_misc_proc_init(void);
1224 void ipv6_misc_proc_exit(void);
1225 int snmp6_register_dev(struct inet6_dev *idev);
1226 int snmp6_unregister_dev(struct inet6_dev *idev);
1227 
1228 #else
1229 static inline int ac6_proc_init(struct net *net) { return 0; }
1230 static inline void ac6_proc_exit(struct net *net) { }
1231 static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }
1232 static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }
1233 #endif
1234 
1235 #ifdef CONFIG_SYSCTL
1236 struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
1237 struct ctl_table *ipv6_route_sysctl_init(struct net *net);
1238 int ipv6_sysctl_register(void);
1239 void ipv6_sysctl_unregister(void);
1240 #endif
1241 
1242 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
1243               const struct in6_addr *addr);
1244 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
1245               const struct in6_addr *addr, unsigned int mode);
1246 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
1247               const struct in6_addr *addr);
1248 
1249 static inline int ip6_sock_set_v6only(struct sock *sk)
1250 {
1251     if (inet_sk(sk)->inet_num)
1252         return -EINVAL;
1253     lock_sock(sk);
1254     sk->sk_ipv6only = true;
1255     release_sock(sk);
1256     return 0;
1257 }
1258 
1259 static inline void ip6_sock_set_recverr(struct sock *sk)
1260 {
1261     lock_sock(sk);
1262     inet6_sk(sk)->recverr = true;
1263     release_sock(sk);
1264 }
1265 
1266 static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
1267 {
1268     unsigned int pref = 0;
1269     unsigned int prefmask = ~0;
1270 
1271     /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
1272     switch (val & (IPV6_PREFER_SRC_PUBLIC |
1273                IPV6_PREFER_SRC_TMP |
1274                IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
1275     case IPV6_PREFER_SRC_PUBLIC:
1276         pref |= IPV6_PREFER_SRC_PUBLIC;
1277         prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1278                   IPV6_PREFER_SRC_TMP);
1279         break;
1280     case IPV6_PREFER_SRC_TMP:
1281         pref |= IPV6_PREFER_SRC_TMP;
1282         prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1283                   IPV6_PREFER_SRC_TMP);
1284         break;
1285     case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
1286         prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
1287                   IPV6_PREFER_SRC_TMP);
1288         break;
1289     case 0:
1290         break;
1291     default:
1292         return -EINVAL;
1293     }
1294 
1295     /* check HOME/COA conflicts */
1296     switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
1297     case IPV6_PREFER_SRC_HOME:
1298         prefmask &= ~IPV6_PREFER_SRC_COA;
1299         break;
1300     case IPV6_PREFER_SRC_COA:
1301         pref |= IPV6_PREFER_SRC_COA;
1302         break;
1303     case 0:
1304         break;
1305     default:
1306         return -EINVAL;
1307     }
1308 
1309     /* check CGA/NONCGA conflicts */
1310     switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
1311     case IPV6_PREFER_SRC_CGA:
1312     case IPV6_PREFER_SRC_NONCGA:
1313     case 0:
1314         break;
1315     default:
1316         return -EINVAL;
1317     }
1318 
1319     inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
1320     return 0;
1321 }
1322 
1323 static inline int ip6_sock_set_addr_preferences(struct sock *sk, bool val)
1324 {
1325     int ret;
1326 
1327     lock_sock(sk);
1328     ret = __ip6_sock_set_addr_preferences(sk, val);
1329     release_sock(sk);
1330     return ret;
1331 }
1332 
1333 static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
1334 {
1335     lock_sock(sk);
1336     inet6_sk(sk)->rxopt.bits.rxinfo = true;
1337     release_sock(sk);
1338 }
1339 
1340 #endif /* _NET_IPV6_H */
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