| /* |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #ifndef _NET_IPV6_H |
| #define _NET_IPV6_H |
| |
| #include <linux/ipv6.h> |
| #include <linux/hardirq.h> |
| #include <linux/jhash.h> |
| #include <net/if_inet6.h> |
| #include <net/ndisc.h> |
| #include <net/flow.h> |
| #include <net/flow_dissector.h> |
| #include <net/snmp.h> |
| |
| #define SIN6_LEN_RFC2133 24 |
| |
| #define IPV6_MAXPLEN 65535 |
| |
| /* |
| * NextHeader field of IPv6 header |
| */ |
| |
| #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ |
| #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 |
| |
| /* |
| * 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 |
| |
| #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, modifier, idev, field) \ |
| ({ \ |
| struct inet6_dev *_idev = (idev); \ |
| if (likely(_idev != NULL)) \ |
| SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \ |
| SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\ |
| }) |
| |
| /* per device counters are atomic_long_t */ |
| #define _DEVINCATOMIC(net, statname, modifier, idev, field) \ |
| ({ \ |
| struct inet6_dev *_idev = (idev); \ |
| if (likely(_idev != NULL)) \ |
| SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ |
| SNMP_INC_STATS##modifier((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, modifier, idev, field, val) \ |
| ({ \ |
| struct inet6_dev *_idev = (idev); \ |
| if (likely(_idev != NULL)) \ |
| SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \ |
| SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\ |
| }) |
| |
| #define _DEVUPD(net, statname, modifier, idev, field, val) \ |
| ({ \ |
| struct inet6_dev *_idev = (idev); \ |
| if (likely(_idev != NULL)) \ |
| SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \ |
| SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\ |
| }) |
| |
| /* MIBs */ |
| |
| #define IP6_INC_STATS(net, idev,field) \ |
| _DEVINC(net, ipv6, 64, idev, field) |
| #define IP6_INC_STATS_BH(net, idev,field) \ |
| _DEVINC(net, ipv6, 64_BH, idev, field) |
| #define IP6_ADD_STATS(net, idev,field,val) \ |
| _DEVADD(net, ipv6, 64, idev, field, val) |
| #define IP6_ADD_STATS_BH(net, idev,field,val) \ |
| _DEVADD(net, ipv6, 64_BH, idev, field, val) |
| #define IP6_UPD_PO_STATS(net, idev,field,val) \ |
| _DEVUPD(net, ipv6, 64, idev, field, val) |
| #define IP6_UPD_PO_STATS_BH(net, idev,field,val) \ |
| _DEVUPD(net, ipv6, 64_BH, idev, field, val) |
| #define ICMP6_INC_STATS(net, idev, field) \ |
| _DEVINCATOMIC(net, icmpv6, , idev, field) |
| #define ICMP6_INC_STATS_BH(net, idev, field) \ |
| _DEVINCATOMIC(net, icmpv6, _BH, idev, field) |
| |
| #define ICMP6MSGOUT_INC_STATS(net, idev, field) \ |
| _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
| #define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \ |
| _DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
| #define ICMP6MSGIN_INC_STATS_BH(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 { |
| /* 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; |
| |
| /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ |
| }; |
| |
| 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 ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); |
| 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, char __user *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); |
| |
| static inline void fl6_sock_release(struct ip6_flowlabel *fl) |
| { |
| if (fl) |
| atomic_dec(&fl->users); |
| } |
| |
| void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); |
| |
| int 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 __user *newopt, |
| int newoptlen); |
| struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
| struct ipv6_txoptions *opt); |
| |
| bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, |
| const struct inet6_skb_parm *opt); |
| |
| static inline bool ipv6_accept_ra(struct inet6_dev *idev) |
| { |
| /* If forwarding is enabled, RA are not accepted unless the special |
| * hybrid mode (accept_ra=2) is enabled. |
| */ |
| return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : |
| idev->cnf.accept_ra; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static inline int ip6_frag_mem(struct net *net) |
| { |
| return sum_frag_mem_limit(&net->ipv6.frags); |
| } |
| #endif |
| |
| #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 bool |
| ipv6_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_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 == 64 |
| static 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); |
| } |
| #else |
| static 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 |
| |
| struct inet_frag_queue; |
| |
| enum ip6_defrag_users { |
| IP6_DEFRAG_LOCAL_DELIVER, |
| IP6_DEFRAG_CONNTRACK_IN, |
| __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX, |
| IP6_DEFRAG_CONNTRACK_OUT, |
| __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX, |
| IP6_DEFRAG_CONNTRACK_BRIDGE_IN, |
| __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, |
| }; |
| |
| struct ip6_create_arg { |
| __be32 id; |
| u32 user; |
| const struct in6_addr *src; |
| const struct in6_addr *dst; |
| u8 ecn; |
| }; |
| |
| void ip6_frag_init(struct inet_frag_queue *q, const void *a); |
| bool ip6_frag_match(const struct inet_frag_queue *q, const void *a); |
| |
| /* |
| * Equivalent of ipv4 struct ip |
| */ |
| struct frag_queue { |
| struct inet_frag_queue q; |
| |
| __be32 id; /* fragment id */ |
| u32 user; |
| struct in6_addr saddr; |
| struct in6_addr daddr; |
| |
| int iif; |
| unsigned int csum; |
| __u16 nhoffset; |
| u8 ecn; |
| }; |
| |
| void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, |
| struct inet_frags *frags); |
| |
| 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) |
| { |
| u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1]; |
| |
| return jhash_3words(v, |
| (__force u32)a->s6_addr32[2], |
| (__force u32)a->s6_addr32[3], |
| 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; |
| } |
| |
| /* |
| * 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 exacly, 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 == 64 |
| static 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); |
| void 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 = np->mcast_hops; |
| else |
| hlimit = 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->saddr, sizeof(flow->addrs.v6addrs)); |
| flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| |
| /* 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(struct net *net, struct sk_buff *skb, |
| __be32 flowlabel, bool autolabel, |
| struct flowi6 *fl6) |
| { |
| u32 hash; |
| |
| if (flowlabel || |
| net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || |
| (!autolabel && |
| net->ipv6.sysctl.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 possbility that any useful information to an |
| * attacker is leaked. Only lower 20 bits are relevant. |
| */ |
| rol32(hash, 16); |
| |
| flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; |
| |
| if (net->ipv6.sysctl.flowlabel_state_ranges) |
| flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; |
| |
| return flowlabel; |
| } |
| |
| static inline int ip6_default_np_autolabel(struct net *net) |
| { |
| switch (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; |
| } |
| } |
| #else |
| static inline void ip6_set_txhash(struct sock *sk) { } |
| static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, |
| __be32 flowlabel, bool autolabel, |
| struct flowi6 *fl6) |
| { |
| return flowlabel; |
| } |
| static inline int ip6_default_np_autolabel(struct net *net) |
| { |
| return 0; |
| } |
| #endif |
| |
| |
| /* |
| * 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; |
| } |
| /* |
| * 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); |
| |
| 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, |
| struct ipv6_txoptions *opt, int tclass); |
| |
| 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, int length, int transhdrlen, int hlimit, |
| int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
| struct rt6_info *rt, unsigned int flags, int dontfrag); |
| |
| 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 inet6_cork *v6_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, int length, int transhdrlen, |
| int hlimit, int tclass, struct ipv6_txoptions *opt, |
| struct flowi6 *fl6, struct rt6_info *rt, |
| unsigned int flags, int dontfrag); |
| |
| static inline struct sk_buff *ip6_finish_skb(struct sock *sk) |
| { |
| return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork, |
| &inet6_sk(sk)->cork); |
| } |
| |
| int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
| struct flowi6 *fl6); |
| struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, |
| const struct in6_addr *final_dst); |
| struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
| const struct in6_addr *final_dst); |
| struct dst_entry *ip6_blackhole_route(struct net *net, |
| struct dst_entry *orig_dst); |
| |
| /* |
| * skb processing functions |
| */ |
| |
| int ip6_output(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); |
| |
| int __ip6_local_out(struct sock *sk, struct sk_buff *skb); |
| int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb); |
| int ip6_local_out(struct sk_buff *skb); |
| |
| /* |
| * Extension header (options) processing |
| */ |
| |
| void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, |
| u8 *proto, struct in6_addr **daddr_p); |
| void 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(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); |
| |
| /* |
| * socket options (ipv6_sockglue.c) |
| */ |
| |
| int ipv6_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen); |
| int ipv6_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen); |
| int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen); |
| int compat_ipv6_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen); |
| |
| int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len); |
| int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr, |
| int addr_len); |
| |
| int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, |
| int *addr_len); |
| int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
| int *addr_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); |
| |
| int inet6_release(struct socket *sock); |
| int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len); |
| int inet6_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, |
| int peer); |
| int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg); |
| |
| int inet6_hash_connect(struct inet_timewait_death_row *death_row, |
| struct sock *sk); |
| |
| /* |
| * reassembly.c |
| */ |
| extern const struct proto_ops inet6_stream_ops; |
| extern const struct proto_ops inet6_dgram_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); |
| int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
| struct group_filter __user *optval, int __user *optlen); |
| |
| #ifdef CONFIG_PROC_FS |
| int 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 udplite6_proc_init(void); |
| void udplite6_proc_exit(void); |
| 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); |
| |
| #else |
| static 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_SYSCTL |
| extern struct ctl_table ipv6_route_table_template[]; |
| |
| struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
| struct ctl_table *ipv6_route_sysctl_init(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_drop(struct sock *sk, int ifindex, |
| const struct in6_addr *addr); |
| #endif /* _NET_IPV6_H */ |