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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#ifndef _NET_IPV6_H#define _NET_IPV6_H
#include <linux/ipv6.h>#include <linux/hardirq.h>#include <linux/jhash.h>#include <linux/refcount.h>#include <linux/jump_label_ratelimit.h>#include <net/if_inet6.h>#include <net/flow.h>#include <net/flow_dissector.h>#include <net/inet_dscp.h>#include <net/snmp.h>#include <net/netns/hash.h>
struct ip_tunnel_info;
#define SIN6_LEN_RFC2133 24
/* * NextHeader field of IPv6 header */
#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */#define NEXTHDR_IPV4 4 /* IPv4 in IPv6 */#define NEXTHDR_TCP 6 /* TCP segment. */#define NEXTHDR_UDP 17 /* UDP message. */#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */#define NEXTHDR_ROUTING 43 /* Routing header. */#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */#define NEXTHDR_GRE 47 /* GRE header. */#define NEXTHDR_ESP 50 /* Encapsulating security payload. */#define NEXTHDR_AUTH 51 /* Authentication header. */#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */#define NEXTHDR_NONE 59 /* No next header */#define NEXTHDR_DEST 60 /* Destination options header. */#define NEXTHDR_SCTP 132 /* SCTP message. */#define NEXTHDR_MOBILITY 135 /* Mobility header. */
#define NEXTHDR_MAX 255
#define IPV6_DEFAULT_HOPLIMIT 64#define IPV6_DEFAULT_MCASTHOPS 1
/* Limits on Hop-by-Hop and Destination options. * * Per RFC8200 there is no limit on the maximum number or lengths of options in * Hop-by-Hop or Destination options other then the packet must fit in an MTU. * We allow configurable limits in order to mitigate potential denial of * service attacks. * * There are three limits that may be set: * - Limit the number of options in a Hop-by-Hop or Destination options * extension header * - Limit the byte length of a Hop-by-Hop or Destination options extension * header * - Disallow unknown options * * The limits are expressed in corresponding sysctls: * * ipv6.sysctl.max_dst_opts_cnt * ipv6.sysctl.max_hbh_opts_cnt * ipv6.sysctl.max_dst_opts_len * ipv6.sysctl.max_hbh_opts_len * * max_*_opts_cnt is the number of TLVs that are allowed for Destination * options or Hop-by-Hop options. If the number is less than zero then unknown * TLVs are disallowed and the number of known options that are allowed is the * absolute value. Setting the value to INT_MAX indicates no limit. * * max_*_opts_len is the length limit in bytes of a Destination or * Hop-by-Hop options extension header. Setting the value to INT_MAX * indicates no length limit. * * If a limit is exceeded when processing an extension header the packet is * silently discarded. */
/* Default limits for Hop-by-Hop and Destination options */#define IP6_DEFAULT_MAX_DST_OPTS_CNT 8#define IP6_DEFAULT_MAX_HBH_OPTS_CNT 8#define IP6_DEFAULT_MAX_DST_OPTS_LEN INT_MAX /* No limit */#define IP6_DEFAULT_MAX_HBH_OPTS_LEN INT_MAX /* No limit */
/* Hard limit on traversed IPv6 extension headers */#define IP6_MAX_EXT_HDRS_CNT 12
/* * Addr type * * type - unicast | multicast * scope - local | site | global * v4 - compat * v4mapped * any * loopback */
#define IPV6_ADDR_ANY 0x0000U
#define IPV6_ADDR_UNICAST 0x0001U#define IPV6_ADDR_MULTICAST 0x0002U
#define IPV6_ADDR_LOOPBACK 0x0010U#define IPV6_ADDR_LINKLOCAL 0x0020U#define IPV6_ADDR_SITELOCAL 0x0040U
#define IPV6_ADDR_COMPATv4 0x0080U
#define IPV6_ADDR_SCOPE_MASK 0x00f0U
#define IPV6_ADDR_MAPPED 0x1000U
/* * Addr scopes */#define IPV6_ADDR_MC_SCOPE(a) \ ((a)->s6_addr[1] & 0x0f) /* nonstandard */#define __IPV6_ADDR_SCOPE_INVALID -1#define IPV6_ADDR_SCOPE_NODELOCAL 0x01#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02#define IPV6_ADDR_SCOPE_SITELOCAL 0x05#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
/* * Addr flags */#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ ((a)->s6_addr[1] & 0x10)#define IPV6_ADDR_MC_FLAG_PREFIX(a) \ ((a)->s6_addr[1] & 0x20)#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ ((a)->s6_addr[1] & 0x40)
/* * fragmentation header */
struct frag_hdr { __u8 nexthdr; __u8 reserved; __be16 frag_off; __be32 identification;};
#define IP6_MF 0x0001#define IP6_OFFSET 0xFFF8
struct ip6_fraglist_iter { struct ipv6hdr *tmp_hdr; struct sk_buff *frag; int offset; unsigned int hlen; __be32 frag_id; u8 nexthdr;};
int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr, u8 nexthdr, __be32 frag_id, struct ip6_fraglist_iter *iter);void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);
static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter){ struct sk_buff *skb = iter->frag;
iter->frag = skb->next; skb_mark_not_on_list(skb);
return skb;}
struct ip6_frag_state { u8 *prevhdr; unsigned int hlen; unsigned int mtu; unsigned int left; int offset; int ptr; int hroom; int troom; __be32 frag_id; u8 nexthdr;};
void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu, unsigned short needed_tailroom, int hdr_room, u8 *prevhdr, u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);struct sk_buff *ip6_frag_next(struct sk_buff *skb, struct ip6_frag_state *state);
#define IP6_REPLY_MARK(net, mark) \ ((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
#include <net/sock.h>
/* sysctls */extern int sysctl_mld_max_msf;extern int sysctl_mld_qrv;
#define _DEVINC(net, statname, mod, idev, field) \({ \ struct inet6_dev *_idev = (idev); \ if (likely(_idev != NULL)) \ mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\})
/* per device counters are atomic_long_t */#define _DEVINCATOMIC(net, statname, mod, idev, field) \({ \ struct inet6_dev *_idev = (idev); \ if (likely(_idev != NULL)) \ SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\})
/* per device and per net counters are atomic_long_t */#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \({ \ struct inet6_dev *_idev = (idev); \ if (likely(_idev != NULL)) \ SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\})
#define _DEVADD(net, statname, mod, idev, field, val) \({ \ struct inet6_dev *_idev = (idev); \ unsigned long _field = (field); \ unsigned long _val = (val); \ if (likely(_idev != NULL)) \ mod##SNMP_ADD_STATS((_idev)->stats.statname, _field, _val); \ mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, _field, _val);\})
#define _DEVUPD(net, statname, mod, idev, field, val) \({ \ struct inet6_dev *_idev = (idev); \ unsigned long _val = (val); \ if (likely(_idev != NULL)) \ mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, _val); \ mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, _val);\})
/* MIBs */
#define IP6_INC_STATS(net, idev,field) \ _DEVINC(net, ipv6, , idev, field)#define __IP6_INC_STATS(net, idev,field) \ _DEVINC(net, ipv6, __, idev, field)#define IP6_ADD_STATS(net, idev,field,val) \ _DEVADD(net, ipv6, , idev, field, val)#define __IP6_ADD_STATS(net, idev,field,val) \ _DEVADD(net, ipv6, __, idev, field, val)#define IP6_UPD_PO_STATS(net, idev,field,val) \ _DEVUPD(net, ipv6, , idev, field, val)#define __IP6_UPD_PO_STATS(net, idev,field,val) \ _DEVUPD(net, ipv6, __, idev, field, val)#define ICMP6_INC_STATS(net, idev, field) \ _DEVINCATOMIC(net, icmpv6, , idev, field)#define __ICMP6_INC_STATS(net, idev, field) \ _DEVINCATOMIC(net, icmpv6, __, idev, field)
#define ICMP6MSGOUT_INC_STATS(net, idev, field) \ _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)#define ICMP6MSGIN_INC_STATS(net, idev, field) \ _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
struct ip6_ra_chain { struct ip6_ra_chain *next; struct sock *sk; int sel; void (*destructor)(struct sock *);};
extern struct ip6_ra_chain *ip6_ra_chain;extern rwlock_t ip6_ra_lock;
/* This structure is prepared by protocol, when parsing ancillary data and passed to IPv6. */
struct ipv6_txoptions { refcount_t refcnt; /* Length of this structure */ int tot_len;
/* length of extension headers */
__u16 opt_flen; /* after fragment hdr */ __u16 opt_nflen; /* before fragment hdr */
struct ipv6_opt_hdr *hopopt; struct ipv6_opt_hdr *dst0opt; struct ipv6_rt_hdr *srcrt; /* Routing Header */ struct ipv6_opt_hdr *dst1opt; struct rcu_head rcu; /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */};
/* flowlabel_reflect sysctl values */enum flowlabel_reflect { FLOWLABEL_REFLECT_ESTABLISHED = 1, FLOWLABEL_REFLECT_TCP_RESET = 2, FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES = 4,};
struct ip6_flowlabel { struct ip6_flowlabel __rcu *next; __be32 label; atomic_t users; struct in6_addr dst; struct ipv6_txoptions *opt; unsigned long linger; struct rcu_head rcu; u8 share; union { struct pid *pid; kuid_t uid; } owner; unsigned long lastuse; unsigned long expires; struct net *fl_net;};
#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000)
#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)#define IPV6_TCLASS_SHIFT 20
struct ipv6_fl_socklist { struct ipv6_fl_socklist __rcu *next; struct ip6_flowlabel *fl; struct rcu_head rcu;};
struct ipcm6_cookie { struct sockcm_cookie sockc; __s16 hlimit; __s16 tclass; __u16 gso_size; __s8 dontfrag; struct ipv6_txoptions *opt;};
static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6, const struct sock *sk){ *ipc6 = (struct ipcm6_cookie) { .hlimit = -1, .tclass = inet6_sk(sk)->tclass, .dontfrag = inet6_test_bit(DONTFRAG, sk), };
sockcm_init(&ipc6->sockc, sk);}
static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np){ struct ipv6_txoptions *opt;
rcu_read_lock(); opt = rcu_dereference(np->opt); if (opt) { if (!refcount_inc_not_zero(&opt->refcnt)) opt = NULL; else opt = rcu_pointer_handoff(opt); } rcu_read_unlock(); return opt;}
static inline void txopt_put(struct ipv6_txoptions *opt){ if (opt && refcount_dec_and_test(&opt->refcnt)) kfree_rcu(opt, rcu);}
#if IS_ENABLED(CONFIG_IPV6)struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);
extern struct static_key_false_deferred ipv6_flowlabel_exclusive;static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label){ if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key) && READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl)) return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);
return NULL;}#endif
struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, struct ip6_flowlabel *fl, struct ipv6_txoptions *fopt);void fl6_free_socklist(struct sock *sk);int ipv6_flowlabel_opt(struct sock *sk, sockptr_t optval, int optlen);int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, int flags);int ip6_flowlabel_init(void);void ip6_flowlabel_cleanup(void);bool ip6_autoflowlabel(struct net *net, const struct sock *sk);
static inline void fl6_sock_release(struct ip6_flowlabel *fl){ if (fl) atomic_dec(&fl->users);}
enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, struct icmp6hdr *thdr, int len);
int ip6_ra_control(struct sock *sk, int sel);
int ipv6_parse_hopopts(struct sk_buff *skb);
struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt, int newtype, struct ipv6_opt_hdr *newopt);struct ipv6_txoptions *__ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt);
static inline struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, struct ipv6_txoptions *opt){ if (!opt) return NULL; return __ipv6_fixup_options(opt_space, opt);}
bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, const struct inet6_skb_parm *opt);struct ipv6_txoptions *ipv6_update_options(struct sock *sk, struct ipv6_txoptions *opt);
static inline bool ipv6_accept_ra(const struct inet6_dev *idev){ s32 accept_ra = READ_ONCE(idev->cnf.accept_ra);
/* If forwarding is enabled, RA are not accepted unless the special * hybrid mode (accept_ra=2) is enabled. */ return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 : accept_ra;}
#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
int __ipv6_addr_type(const struct in6_addr *addr);static inline int ipv6_addr_type(const struct in6_addr *addr){ return __ipv6_addr_type(addr) & 0xffff;}
static inline int ipv6_addr_scope(const struct in6_addr *addr){ return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;}
static inline int __ipv6_addr_src_scope(int type){ return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);}
static inline int ipv6_addr_src_scope(const struct in6_addr *addr){ return __ipv6_addr_src_scope(__ipv6_addr_type(addr));}
static inline bool __ipv6_addr_needs_scope_id(int type){ return type & IPV6_ADDR_LINKLOCAL || (type & IPV6_ADDR_MULTICAST && (type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));}
static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface){ return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;}
static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2){ return memcmp(a1, a2, sizeof(struct in6_addr));}
static inline boolipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, const struct in6_addr *a2){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ul1 = (const unsigned long *)a1; const unsigned long *ulm = (const unsigned long *)m; const unsigned long *ul2 = (const unsigned long *)a2;
return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | ((ul1[1] ^ ul2[1]) & ulm[1]));#else return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));#endif}
static inline void ipv6_addr_prefix(struct in6_addr *pfx, const struct in6_addr *addr, int plen){ /* caller must guarantee 0 <= plen <= 128 */ int o = plen >> 3, b = plen & 0x7;
memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); memcpy(pfx->s6_addr, addr, o); if (b != 0) pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);}
static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, const struct in6_addr *pfx, int plen){ /* caller must guarantee 0 <= plen <= 128 */ int o = plen >> 3, b = plen & 0x7;
memcpy(addr->s6_addr, pfx, o); if (b != 0) { addr->s6_addr[o] &= ~(0xff00 >> b); addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); }}
static inline void __ipv6_addr_set_half(__be32 *addr, __be32 wh, __be32 wl){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64#if defined(__BIG_ENDIAN) if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { *(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); return; }#elif defined(__LITTLE_ENDIAN) if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { *(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); return; }#endif#endif addr[0] = wh; addr[1] = wl;}
static inline void ipv6_addr_set(struct in6_addr *addr, __be32 w1, __be32 w2, __be32 w3, __be32 w4){ __ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); __ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);}
static inline bool ipv6_addr_equal(const struct in6_addr *a1, const struct in6_addr *a2){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ul1 = (const unsigned long *)a1; const unsigned long *ul2 = (const unsigned long *)a2;
return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;#else return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | (a1->s6_addr32[1] ^ a2->s6_addr32[1]) | (a1->s6_addr32[2] ^ a2->s6_addr32[2]) | (a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;#endif}
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, const __be64 *a2, unsigned int len){ if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) return false; return true;}
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, const struct in6_addr *addr2, unsigned int prefixlen){ const __be64 *a1 = (const __be64 *)addr1; const __be64 *a2 = (const __be64 *)addr2;
if (prefixlen >= 64) { if (a1[0] ^ a2[0]) return false; return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64); } return __ipv6_prefix_equal64_half(a1, a2, prefixlen);}#elsestatic inline bool ipv6_prefix_equal(const struct in6_addr *addr1, const struct in6_addr *addr2, unsigned int prefixlen){ const __be32 *a1 = addr1->s6_addr32; const __be32 *a2 = addr2->s6_addr32; unsigned int pdw, pbi;
/* check complete u32 in prefix */ pdw = prefixlen >> 5; if (pdw && memcmp(a1, a2, pdw << 2)) return false;
/* check incomplete u32 in prefix */ pbi = prefixlen & 0x1f; if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) return false;
return true;}#endif
static inline bool ipv6_addr_any(const struct in6_addr *a){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ul = (const unsigned long *)a;
return (ul[0] | ul[1]) == 0UL;#else return (a->s6_addr32[0] | a->s6_addr32[1] | a->s6_addr32[2] | a->s6_addr32[3]) == 0;#endif}
static inline u32 ipv6_addr_hash(const struct in6_addr *a){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const unsigned long *ul = (const unsigned long *)a; unsigned long x = ul[0] ^ ul[1];
return (u32)(x ^ (x >> 32));#else return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^ a->s6_addr32[2] ^ a->s6_addr32[3]);#endif}
/* more secured version of ipv6_addr_hash() */static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval){ return jhash2((__force const u32 *)a->s6_addr32, ARRAY_SIZE(a->s6_addr32), initval);}
static inline bool ipv6_addr_loopback(const struct in6_addr *a){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 const __be64 *be = (const __be64 *)a;
return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;#else return (a->s6_addr32[0] | a->s6_addr32[1] | a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;#endif}
/* * Note that we must __force cast these to unsigned long to make sparse happy, * since all of the endian-annotated types are fixed size regardless of arch. */static inline bool ipv6_addr_v4mapped(const struct in6_addr *a){ return (#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 *(unsigned long *)a |#else (__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |#endif (__force unsigned long)(a->s6_addr32[2] ^ cpu_to_be32(0x0000ffff))) == 0UL;}
static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a){ return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);}
static inline u32 ipv6_portaddr_hash(const struct net *net, const struct in6_addr *addr6, unsigned int port){ unsigned int hash, mix = net_hash_mix(net);
if (ipv6_addr_any(addr6)) hash = jhash_1word(0, mix); else if (ipv6_addr_v4mapped(addr6)) hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); else hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
return hash ^ port;}
/* * Check for a RFC 4843 ORCHID address * (Overlay Routable Cryptographic Hash Identifiers) */static inline bool ipv6_addr_orchid(const struct in6_addr *a){ return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);}
static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr){ return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);}
static inline void ipv6_addr_set_v4mapped(const __be32 addr, struct in6_addr *v4mapped){ ipv6_addr_set(v4mapped, 0, 0, htonl(0x0000FFFF), addr);}
/* * find the first different bit between two addresses * length of address must be a multiple of 32bits */static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen){ const __be32 *a1 = token1, *a2 = token2; int i;
addrlen >>= 2;
for (i = 0; i < addrlen; i++) { __be32 xb = a1[i] ^ a2[i]; if (xb) return i * 32 + 31 - __fls(ntohl(xb)); }
/* * we should *never* get to this point since that * would mean the addrs are equal * * However, we do get to it 8) And exactly, when * addresses are equal 8) * * ip route add 1111::/128 via ... * ip route add 1111::/64 via ... * and we are here. * * Ideally, this function should stop comparison * at prefix length. It does not, but it is still OK, * if returned value is greater than prefix length. * --ANK (980803) */ return addrlen << 5;}
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen){ const __be64 *a1 = token1, *a2 = token2; int i;
addrlen >>= 3;
for (i = 0; i < addrlen; i++) { __be64 xb = a1[i] ^ a2[i]; if (xb) return i * 64 + 63 - __fls(be64_to_cpu(xb)); }
return addrlen << 6;}#endif
static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen){#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 if (__builtin_constant_p(addrlen) && !(addrlen & 7)) return __ipv6_addr_diff64(token1, token2, addrlen);#endif return __ipv6_addr_diff32(token1, token2, addrlen);}
static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2){ return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));}
__be32 ipv6_select_ident(struct net *net, const struct in6_addr *daddr, const struct in6_addr *saddr);__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
int ip6_dst_hoplimit(struct dst_entry *dst);
static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, struct dst_entry *dst){ int hlimit;
if (ipv6_addr_is_multicast(&fl6->daddr)) hlimit = READ_ONCE(np->mcast_hops); else hlimit = READ_ONCE(np->hop_limit); if (hlimit < 0) hlimit = ip6_dst_hoplimit(dst); return hlimit;}
/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store * Equivalent to : flow->v6addrs.src = iph->saddr; * flow->v6addrs.dst = iph->daddr; */static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, const struct ipv6hdr *iph){ BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) != offsetof(typeof(flow->addrs), v6addrs.src) + sizeof(flow->addrs.v6addrs.src)); memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs)); flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;}
#if IS_ENABLED(CONFIG_IPV6)
static inline bool ipv6_can_nonlocal_bind(const struct net *net, const struct inet_sock *inet){ return READ_ONCE(net->ipv6.sysctl.ip_nonlocal_bind) || test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) || test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);}
/* Sysctl settings for net ipv6.auto_flowlabels */#define IP6_AUTO_FLOW_LABEL_OFF 0#define IP6_AUTO_FLOW_LABEL_OPTOUT 1#define IP6_AUTO_FLOW_LABEL_OPTIN 2#define IP6_AUTO_FLOW_LABEL_FORCED 3
#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED
#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OPTOUT
static inline __be32 ip6_make_flowlabel(const struct net *net, struct sk_buff *skb, __be32 flowlabel, bool autolabel, struct flowi6 *fl6){ u8 auto_flowlabels; u32 hash;
/* @flowlabel may include more than a flow label, eg, the traffic class. * Here we want only the flow label value. */ flowlabel &= IPV6_FLOWLABEL_MASK;
if (flowlabel) return flowlabel;
auto_flowlabels = READ_ONCE(net->ipv6.sysctl.auto_flowlabels); if (auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || (!autolabel && auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) return flowlabel;
hash = skb_get_hash_flowi6(skb, fl6);
/* Since this is being sent on the wire obfuscate hash a bit * to minimize possibility that any useful information to an * attacker is leaked. Only lower 20 bits are relevant. */ hash = rol32(hash, 16);
flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;
if (READ_ONCE(net->ipv6.sysctl.flowlabel_state_ranges)) flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
return flowlabel;}
static inline int ip6_default_np_autolabel(const struct net *net){ switch (READ_ONCE(net->ipv6.sysctl.auto_flowlabels)) { case IP6_AUTO_FLOW_LABEL_OFF: case IP6_AUTO_FLOW_LABEL_OPTIN: default: return 0; case IP6_AUTO_FLOW_LABEL_OPTOUT: case IP6_AUTO_FLOW_LABEL_FORCED: return 1; }}#elsestatic inline __be32 ip6_make_flowlabel(const struct net *net, struct sk_buff *skb, __be32 flowlabel, bool autolabel, struct flowi6 *fl6){ return flowlabel;}static inline int ip6_default_np_autolabel(const struct net *net){ return 0;}#endif
#if IS_ENABLED(CONFIG_IPV6)static inline int ip6_multipath_hash_policy(const struct net *net){ return READ_ONCE(net->ipv6.sysctl.multipath_hash_policy);}static inline u32 ip6_multipath_hash_fields(const struct net *net){ return READ_ONCE(net->ipv6.sysctl.multipath_hash_fields);}#elsestatic inline int ip6_multipath_hash_policy(const struct net *net){ return 0;}static inline u32 ip6_multipath_hash_fields(const struct net *net){ return 0;}#endif
/* Derive the IPv6 ECMP hash from txhash so a rehash may pick a different path; * policy 0 only, and only when txhash is set. >> 1 clears the top bit * (fib6_select_path() uses mp_hash as a signed 31-bit value); ?: 1 keeps the * result non-zero, since mp_hash 0 falls back to rt6_multipath_hash(). */static inline void ip6_ecmp_set_mp_hash(const struct net *net, struct flowi6 *fl6, u32 txhash){ if (ip6_multipath_hash_policy(net) == 0 && txhash) fl6->mp_hash = (txhash >> 1) ?: 1;}
/* * Header manipulation */static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass, __be32 flowlabel){ *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;}
static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr){ return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;}
static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr){ return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;}
static inline u8 ip6_tclass(__be32 flowinfo){ return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;}
static inline dscp_t ip6_dscp(__be32 flowinfo){ return inet_dsfield_to_dscp(ip6_tclass(flowinfo));}
static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel){ return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;}
static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6){ return fl6->flowlabel & IPV6_FLOWLABEL_MASK;}
/* * Prototypes exported by ipv6 */
/* * rcv function (called from netdevice level) */
int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);void ipv6_list_rcv(struct list_head *head, struct packet_type *pt, struct net_device *orig_dev);
int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
/* * upper-layer output functions */int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, size_t length, int transhdrlen, struct ipcm6_cookie *ipc6, struct flowi6 *fl6, struct rt6_info *rt, unsigned int flags);
int ip6_push_pending_frames(struct sock *sk);
void ip6_flush_pending_frames(struct sock *sk);
int ip6_send_skb(struct sk_buff *skb);
struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue, struct inet_cork_full *cork);struct sk_buff *ip6_make_skb(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, size_t length, int transhdrlen, struct ipcm6_cookie *ipc6, struct rt6_info *rt, unsigned int flags, struct inet_cork_full *cork);
static inline struct sk_buff *ip6_finish_skb(struct sock *sk){ return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork);}
int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);#if IS_ENABLED(CONFIG_IPV6)struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, const struct in6_addr *final_dst);#elsestatic inline struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6, const struct in6_addr *final_dst){ return ERR_PTR(-EAFNOSUPPORT);}#endif
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, const struct in6_addr *final_dst, bool connected);struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *orig_dst);
/* * skb processing functions */
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);int ip6_forward(struct sk_buff *skb);int ip6_input(struct sk_buff *skb);int ip6_mc_input(struct sk_buff *skb);void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr, bool have_final);
int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
/* * Extension header (options) processing */
u8 ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 proto, struct in6_addr **daddr_p, struct in6_addr *saddr);u8 ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 proto);
int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp, __be16 *frag_offp);
bool ipv6_ext_hdr(u8 nexthdr);
enum { IP6_FH_F_FRAG = (1 << 0), IP6_FH_F_AUTH = (1 << 1), IP6_FH_F_SKIP_RH = (1 << 2),};
/* find specified header and get offset to it */int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target, unsigned short *fragoff, int *fragflg);
int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
struct in6_addr *__fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt, struct in6_addr *orig);
static inline struct in6_addr *fl6_update_dst(struct flowi6 *fl6, const struct ipv6_txoptions *opt, struct in6_addr *orig){ if (likely(!opt)) return NULL;
return __fl6_update_dst(fl6, opt, orig);}
/* * socket options (ipv6_sockglue.c) */DECLARE_STATIC_KEY_FALSE(ip6_min_hopcount);
int do_ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen);int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen);int do_ipv6_getsockopt(struct sock *sk, int level, int optname, sockptr_t optval, sockptr_t optlen);int ipv6_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
int __ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len);int ip6_datagram_connect(struct sock *sk, struct sockaddr_unsized *addr, int addr_len);int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr_unsized *addr, int addr_len);int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);void ip6_datagram_release_cb(struct sock *sk);
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len);void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload);void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
void inet6_cleanup_sock(struct sock *sk);void inet6_sock_destruct(struct sock *sk);int inet6_release(struct socket *sock);int __inet6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len, u32 flags);int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len);int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len);int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int peer);int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
int inet6_hash_connect(struct inet_timewait_death_row *death_row, struct sock *sk);int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int flags);
/* * reassembly.c */extern const struct proto_ops inet6_stream_ops;extern const struct proto_ops inet6_dgram_ops;extern const struct proto_ops inet6_sockraw_ops;
struct group_source_req;struct group_filter;
int ip6_mc_source(int add, int omode, struct sock *sk, struct group_source_req *pgsr);int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, struct sockaddr_storage *list);int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, sockptr_t optval, size_t ss_offset);
#ifdef CONFIG_PROC_FSint ac6_proc_init(struct net *net);void ac6_proc_exit(struct net *net);int raw6_proc_init(void);void raw6_proc_exit(void);int tcp6_proc_init(struct net *net);void tcp6_proc_exit(struct net *net);int udp6_proc_init(struct net *net);void udp6_proc_exit(struct net *net);int ipv6_misc_proc_init(void);void ipv6_misc_proc_exit(void);int snmp6_register_dev(struct inet6_dev *idev);int snmp6_unregister_dev(struct inet6_dev *idev);
#elsestatic inline int ac6_proc_init(struct net *net) { return 0; }static inline void ac6_proc_exit(struct net *net) { }static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; }static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; }#endif
#ifdef CONFIG_SYSCTLstruct ctl_table *ipv6_icmp_sysctl_init(struct net *net);size_t ipv6_icmp_sysctl_table_size(void);struct ctl_table *ipv6_route_sysctl_init(struct net *net);size_t ipv6_route_sysctl_table_size(struct net *net);int ipv6_sysctl_register(void);void ipv6_sysctl_unregister(void);#endif
int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr);int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, const struct in6_addr *addr, unsigned int mode);int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr);
static inline int ip6_sock_set_v6only(struct sock *sk){ int ret = 0;
lock_sock(sk); if (inet_sk(sk)->inet_num) ret = -EINVAL; else sk->sk_ipv6only = true; release_sock(sk); return ret;}
static inline void ip6_sock_set_recverr(struct sock *sk){ inet6_set_bit(RECVERR6, sk);}
#define IPV6_PREFER_SRC_MASK (IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBLIC | \ IPV6_PREFER_SRC_COA)
static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val){ unsigned int prefmask = ~IPV6_PREFER_SRC_MASK; unsigned int pref = 0;
/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ switch (val & (IPV6_PREFER_SRC_PUBLIC | IPV6_PREFER_SRC_TMP | IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { case IPV6_PREFER_SRC_PUBLIC: pref |= IPV6_PREFER_SRC_PUBLIC; prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | IPV6_PREFER_SRC_TMP); break; case IPV6_PREFER_SRC_TMP: pref |= IPV6_PREFER_SRC_TMP; prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | IPV6_PREFER_SRC_TMP); break; case IPV6_PREFER_SRC_PUBTMP_DEFAULT: prefmask &= ~(IPV6_PREFER_SRC_PUBLIC | IPV6_PREFER_SRC_TMP); break; case 0: break; default: return -EINVAL; }
/* check HOME/COA conflicts */ switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) { case IPV6_PREFER_SRC_HOME: prefmask &= ~IPV6_PREFER_SRC_COA; break; case IPV6_PREFER_SRC_COA: pref |= IPV6_PREFER_SRC_COA; break; case 0: break; default: return -EINVAL; }
/* check CGA/NONCGA conflicts */ switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { case IPV6_PREFER_SRC_CGA: case IPV6_PREFER_SRC_NONCGA: case 0: break; default: return -EINVAL; }
WRITE_ONCE(inet6_sk(sk)->srcprefs, (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref); return 0;}
static inline void ip6_sock_set_recvpktinfo(struct sock *sk){ lock_sock(sk); inet6_sk(sk)->rxopt.bits.rxinfo = true; release_sock(sk);}
#define IPV6_ADDR_WORDS 4
static inline void ipv6_addr_cpu_to_be32(__be32 *dst, const u32 *src){ cpu_to_be32_array(dst, src, IPV6_ADDR_WORDS);}
static inline void ipv6_addr_be32_to_cpu(u32 *dst, const __be32 *src){ be32_to_cpu_array(dst, src, IPV6_ADDR_WORDS);}
#endif /* _NET_IPV6_H */