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1050 lines
29 KiB
1050 lines
29 KiB
/* |
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* Linux INET6 implementation |
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* |
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* Authors: |
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* Pedro Roque <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version |
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* 2 of the License, or (at your option) any later version. |
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*/ |
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|
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#ifndef _NET_IPV6_H |
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#define _NET_IPV6_H |
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|
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#include <linux/ipv6.h> |
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#include <linux/hardirq.h> |
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#include <linux/jhash.h> |
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#include <net/if_inet6.h> |
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#include <net/ndisc.h> |
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#include <net/flow.h> |
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#include <net/flow_dissector.h> |
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#include <net/snmp.h> |
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|
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#define SIN6_LEN_RFC2133 24 |
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|
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#define IPV6_MAXPLEN 65535 |
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|
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/* |
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* NextHeader field of IPv6 header |
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*/ |
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|
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#define NEXTHDR_HOP 0 /* Hop-by-hop option header. */ |
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#define NEXTHDR_TCP 6 /* TCP segment. */ |
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#define NEXTHDR_UDP 17 /* UDP message. */ |
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#define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */ |
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#define NEXTHDR_ROUTING 43 /* Routing header. */ |
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#define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */ |
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#define NEXTHDR_GRE 47 /* GRE header. */ |
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#define NEXTHDR_ESP 50 /* Encapsulating security payload. */ |
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#define NEXTHDR_AUTH 51 /* Authentication header. */ |
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#define NEXTHDR_ICMP 58 /* ICMP for IPv6. */ |
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#define NEXTHDR_NONE 59 /* No next header */ |
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#define NEXTHDR_DEST 60 /* Destination options header. */ |
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#define NEXTHDR_SCTP 132 /* SCTP message. */ |
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#define NEXTHDR_MOBILITY 135 /* Mobility header. */ |
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|
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#define NEXTHDR_MAX 255 |
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|
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#define IPV6_DEFAULT_HOPLIMIT 64 |
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#define IPV6_DEFAULT_MCASTHOPS 1 |
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|
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/* |
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* Addr type |
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* |
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* type - unicast | multicast |
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* scope - local | site | global |
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* v4 - compat |
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* v4mapped |
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* any |
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* loopback |
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*/ |
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#define IPV6_ADDR_ANY 0x0000U |
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#define IPV6_ADDR_UNICAST 0x0001U |
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#define IPV6_ADDR_MULTICAST 0x0002U |
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|
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#define IPV6_ADDR_LOOPBACK 0x0010U |
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#define IPV6_ADDR_LINKLOCAL 0x0020U |
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#define IPV6_ADDR_SITELOCAL 0x0040U |
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#define IPV6_ADDR_COMPATv4 0x0080U |
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#define IPV6_ADDR_SCOPE_MASK 0x00f0U |
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|
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#define IPV6_ADDR_MAPPED 0x1000U |
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|
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/* |
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* Addr scopes |
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*/ |
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#define IPV6_ADDR_MC_SCOPE(a) \ |
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((a)->s6_addr[1] & 0x0f) /* nonstandard */ |
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#define __IPV6_ADDR_SCOPE_INVALID -1 |
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#define IPV6_ADDR_SCOPE_NODELOCAL 0x01 |
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#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 |
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#define IPV6_ADDR_SCOPE_SITELOCAL 0x05 |
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#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 |
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#define IPV6_ADDR_SCOPE_GLOBAL 0x0e |
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|
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/* |
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* Addr flags |
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*/ |
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#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \ |
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((a)->s6_addr[1] & 0x10) |
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#define IPV6_ADDR_MC_FLAG_PREFIX(a) \ |
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((a)->s6_addr[1] & 0x20) |
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#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \ |
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((a)->s6_addr[1] & 0x40) |
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|
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/* |
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* fragmentation header |
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*/ |
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struct frag_hdr { |
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__u8 nexthdr; |
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__u8 reserved; |
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__be16 frag_off; |
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__be32 identification; |
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}; |
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|
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#define IP6_MF 0x0001 |
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#define IP6_OFFSET 0xFFF8 |
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#define IP6_REPLY_MARK(net, mark) \ |
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((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0) |
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#include <net/sock.h> |
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|
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/* sysctls */ |
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extern int sysctl_mld_max_msf; |
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extern int sysctl_mld_qrv; |
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#define _DEVINC(net, statname, mod, idev, field) \ |
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({ \ |
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struct inet6_dev *_idev = (idev); \ |
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if (likely(_idev != NULL)) \ |
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mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\ |
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mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\ |
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}) |
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|
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/* per device counters are atomic_long_t */ |
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#define _DEVINCATOMIC(net, statname, mod, idev, field) \ |
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({ \ |
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struct inet6_dev *_idev = (idev); \ |
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if (likely(_idev != NULL)) \ |
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SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ |
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mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\ |
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}) |
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|
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/* per device and per net counters are atomic_long_t */ |
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#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \ |
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({ \ |
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struct inet6_dev *_idev = (idev); \ |
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if (likely(_idev != NULL)) \ |
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SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \ |
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SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\ |
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}) |
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#define _DEVADD(net, statname, mod, idev, field, val) \ |
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({ \ |
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struct inet6_dev *_idev = (idev); \ |
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if (likely(_idev != NULL)) \ |
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mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \ |
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mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\ |
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}) |
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#define _DEVUPD(net, statname, mod, idev, field, val) \ |
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({ \ |
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struct inet6_dev *_idev = (idev); \ |
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if (likely(_idev != NULL)) \ |
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mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \ |
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mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\ |
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}) |
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/* MIBs */ |
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#define IP6_INC_STATS(net, idev,field) \ |
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_DEVINC(net, ipv6, , idev, field) |
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#define __IP6_INC_STATS(net, idev,field) \ |
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_DEVINC(net, ipv6, __, idev, field) |
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#define IP6_ADD_STATS(net, idev,field,val) \ |
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_DEVADD(net, ipv6, , idev, field, val) |
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#define __IP6_ADD_STATS(net, idev,field,val) \ |
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_DEVADD(net, ipv6, __, idev, field, val) |
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#define IP6_UPD_PO_STATS(net, idev,field,val) \ |
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_DEVUPD(net, ipv6, , idev, field, val) |
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#define __IP6_UPD_PO_STATS(net, idev,field,val) \ |
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_DEVUPD(net, ipv6, __, idev, field, val) |
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#define ICMP6_INC_STATS(net, idev, field) \ |
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_DEVINCATOMIC(net, icmpv6, , idev, field) |
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#define __ICMP6_INC_STATS(net, idev, field) \ |
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_DEVINCATOMIC(net, icmpv6, __, idev, field) |
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|
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#define ICMP6MSGOUT_INC_STATS(net, idev, field) \ |
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_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256) |
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#define ICMP6MSGIN_INC_STATS(net, idev, field) \ |
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_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field) |
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struct ip6_ra_chain { |
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struct ip6_ra_chain *next; |
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struct sock *sk; |
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int sel; |
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void (*destructor)(struct sock *); |
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}; |
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extern struct ip6_ra_chain *ip6_ra_chain; |
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extern rwlock_t ip6_ra_lock; |
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|
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/* |
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This structure is prepared by protocol, when parsing |
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ancillary data and passed to IPv6. |
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*/ |
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struct ipv6_txoptions { |
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atomic_t refcnt; |
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/* Length of this structure */ |
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int tot_len; |
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|
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/* length of extension headers */ |
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__u16 opt_flen; /* after fragment hdr */ |
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__u16 opt_nflen; /* before fragment hdr */ |
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struct ipv6_opt_hdr *hopopt; |
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struct ipv6_opt_hdr *dst0opt; |
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struct ipv6_rt_hdr *srcrt; /* Routing Header */ |
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struct ipv6_opt_hdr *dst1opt; |
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struct rcu_head rcu; |
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/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */ |
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}; |
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struct ip6_flowlabel { |
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struct ip6_flowlabel __rcu *next; |
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__be32 label; |
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atomic_t users; |
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struct in6_addr dst; |
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struct ipv6_txoptions *opt; |
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unsigned long linger; |
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struct rcu_head rcu; |
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u8 share; |
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union { |
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struct pid *pid; |
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kuid_t uid; |
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} owner; |
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unsigned long lastuse; |
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unsigned long expires; |
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struct net *fl_net; |
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}; |
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#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF) |
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#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF) |
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#define IPV6_FLOWLABEL_STATELESS_FLAG cpu_to_be32(0x00080000) |
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#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) |
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#define IPV6_TCLASS_SHIFT 20 |
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struct ipv6_fl_socklist { |
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struct ipv6_fl_socklist __rcu *next; |
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struct ip6_flowlabel *fl; |
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struct rcu_head rcu; |
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}; |
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struct ipcm6_cookie { |
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__s16 hlimit; |
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__s16 tclass; |
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__s8 dontfrag; |
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struct ipv6_txoptions *opt; |
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}; |
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static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) |
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{ |
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struct ipv6_txoptions *opt; |
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rcu_read_lock(); |
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opt = rcu_dereference(np->opt); |
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if (opt) { |
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if (!atomic_inc_not_zero(&opt->refcnt)) |
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opt = NULL; |
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else |
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opt = rcu_pointer_handoff(opt); |
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} |
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rcu_read_unlock(); |
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return opt; |
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} |
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static inline void txopt_put(struct ipv6_txoptions *opt) |
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{ |
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if (opt && atomic_dec_and_test(&opt->refcnt)) |
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kfree_rcu(opt, rcu); |
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} |
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struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label); |
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struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, |
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struct ip6_flowlabel *fl, |
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struct ipv6_txoptions *fopt); |
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void fl6_free_socklist(struct sock *sk); |
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int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen); |
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int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, |
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int flags); |
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int ip6_flowlabel_init(void); |
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void ip6_flowlabel_cleanup(void); |
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static inline void fl6_sock_release(struct ip6_flowlabel *fl) |
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{ |
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if (fl) |
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atomic_dec(&fl->users); |
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} |
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void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info); |
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int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
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struct icmp6hdr *thdr, int len); |
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int ip6_ra_control(struct sock *sk, int sel); |
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int ipv6_parse_hopopts(struct sk_buff *skb); |
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struct ipv6_txoptions *ipv6_dup_options(struct sock *sk, |
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struct ipv6_txoptions *opt); |
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struct ipv6_txoptions *ipv6_renew_options(struct sock *sk, |
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struct ipv6_txoptions *opt, |
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int newtype, |
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struct ipv6_opt_hdr __user *newopt, |
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int newoptlen); |
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struct ipv6_txoptions * |
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ipv6_renew_options_kern(struct sock *sk, |
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struct ipv6_txoptions *opt, |
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int newtype, |
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struct ipv6_opt_hdr *newopt, |
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int newoptlen); |
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struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space, |
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struct ipv6_txoptions *opt); |
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bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb, |
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const struct inet6_skb_parm *opt); |
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struct ipv6_txoptions *ipv6_update_options(struct sock *sk, |
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struct ipv6_txoptions *opt); |
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static inline bool ipv6_accept_ra(struct inet6_dev *idev) |
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{ |
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/* If forwarding is enabled, RA are not accepted unless the special |
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* hybrid mode (accept_ra=2) is enabled. |
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*/ |
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return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 : |
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idev->cnf.accept_ra; |
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} |
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#if IS_ENABLED(CONFIG_IPV6) |
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static inline int ip6_frag_mem(struct net *net) |
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{ |
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return sum_frag_mem_limit(&net->ipv6.frags); |
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} |
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#endif |
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#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */ |
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#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */ |
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#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */ |
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int __ipv6_addr_type(const struct in6_addr *addr); |
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static inline int ipv6_addr_type(const struct in6_addr *addr) |
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{ |
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return __ipv6_addr_type(addr) & 0xffff; |
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} |
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static inline int ipv6_addr_scope(const struct in6_addr *addr) |
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{ |
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return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; |
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} |
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static inline int __ipv6_addr_src_scope(int type) |
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{ |
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return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16); |
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} |
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static inline int ipv6_addr_src_scope(const struct in6_addr *addr) |
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{ |
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return __ipv6_addr_src_scope(__ipv6_addr_type(addr)); |
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} |
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static inline bool __ipv6_addr_needs_scope_id(int type) |
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{ |
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return type & IPV6_ADDR_LINKLOCAL || |
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(type & IPV6_ADDR_MULTICAST && |
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(type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL))); |
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} |
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static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface) |
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{ |
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return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0; |
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} |
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static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) |
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{ |
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return memcmp(a1, a2, sizeof(struct in6_addr)); |
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} |
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static inline bool |
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ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m, |
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const struct in6_addr *a2) |
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{ |
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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const unsigned long *ul1 = (const unsigned long *)a1; |
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const unsigned long *ulm = (const unsigned long *)m; |
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const unsigned long *ul2 = (const unsigned long *)a2; |
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|
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return !!(((ul1[0] ^ ul2[0]) & ulm[0]) | |
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((ul1[1] ^ ul2[1]) & ulm[1])); |
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#else |
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return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) | |
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((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) | |
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((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) | |
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((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3])); |
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#endif |
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} |
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static inline void ipv6_addr_prefix(struct in6_addr *pfx, |
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const struct in6_addr *addr, |
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int plen) |
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{ |
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/* caller must guarantee 0 <= plen <= 128 */ |
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int o = plen >> 3, |
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b = plen & 0x7; |
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|
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memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr)); |
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memcpy(pfx->s6_addr, addr, o); |
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if (b != 0) |
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pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); |
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} |
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|
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static inline void ipv6_addr_prefix_copy(struct in6_addr *addr, |
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const struct in6_addr *pfx, |
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int plen) |
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{ |
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/* caller must guarantee 0 <= plen <= 128 */ |
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int o = plen >> 3, |
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b = plen & 0x7; |
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|
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memcpy(addr->s6_addr, pfx, o); |
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if (b != 0) { |
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addr->s6_addr[o] &= ~(0xff00 >> b); |
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addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b)); |
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} |
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} |
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static inline void __ipv6_addr_set_half(__be32 *addr, |
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__be32 wh, __be32 wl) |
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{ |
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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#if defined(__BIG_ENDIAN) |
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if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) { |
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*(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl)); |
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return; |
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} |
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#elif defined(__LITTLE_ENDIAN) |
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if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) { |
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*(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh)); |
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return; |
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} |
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#endif |
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#endif |
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addr[0] = wh; |
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addr[1] = wl; |
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} |
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|
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static inline void ipv6_addr_set(struct in6_addr *addr, |
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__be32 w1, __be32 w2, |
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__be32 w3, __be32 w4) |
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{ |
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__ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2); |
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__ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4); |
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} |
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|
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static inline bool ipv6_addr_equal(const struct in6_addr *a1, |
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const struct in6_addr *a2) |
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{ |
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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const unsigned long *ul1 = (const unsigned long *)a1; |
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const unsigned long *ul2 = (const unsigned long *)a2; |
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|
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return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL; |
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#else |
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return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) | |
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(a1->s6_addr32[1] ^ a2->s6_addr32[1]) | |
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(a1->s6_addr32[2] ^ a2->s6_addr32[2]) | |
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(a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0; |
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#endif |
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} |
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|
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 |
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static inline bool __ipv6_prefix_equal64_half(const __be64 *a1, |
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const __be64 *a2, |
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unsigned int len) |
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{ |
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if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len)))) |
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return false; |
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return true; |
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} |
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|
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static inline bool ipv6_prefix_equal(const struct in6_addr *addr1, |
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const struct in6_addr *addr2, |
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unsigned int prefixlen) |
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{ |
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const __be64 *a1 = (const __be64 *)addr1; |
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const __be64 *a2 = (const __be64 *)addr2; |
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|
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if (prefixlen >= 64) { |
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if (a1[0] ^ a2[0]) |
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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; |
|
int iif; |
|
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. |
|
*/ |
|
hash = 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; |
|
} |
|
|
|
static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel) |
|
{ |
|
return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel; |
|
} |
|
|
|
/* |
|
* 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, |
|
__u32 mark, 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, |
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
|
struct rt6_info *rt, unsigned int flags, |
|
const struct sockcm_cookie *sockc); |
|
|
|
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, |
|
struct ipcm6_cookie *ipc6, struct flowi6 *fl6, |
|
struct rt6_info *rt, unsigned int flags, |
|
const struct sockcm_cookie *sockc); |
|
|
|
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 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); |
|
|
|
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 |
|
*/ |
|
|
|
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(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); |
|
|
|
/* |
|
* 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(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 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 *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); |
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#ifdef CONFIG_PROC_FS |
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int ac6_proc_init(struct net *net); |
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void ac6_proc_exit(struct net *net); |
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int raw6_proc_init(void); |
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void raw6_proc_exit(void); |
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int tcp6_proc_init(struct net *net); |
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void tcp6_proc_exit(struct net *net); |
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int udp6_proc_init(struct net *net); |
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void udp6_proc_exit(struct net *net); |
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int udplite6_proc_init(void); |
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void udplite6_proc_exit(void); |
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int ipv6_misc_proc_init(void); |
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void ipv6_misc_proc_exit(void); |
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int snmp6_register_dev(struct inet6_dev *idev); |
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int snmp6_unregister_dev(struct inet6_dev *idev); |
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#else |
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static inline int ac6_proc_init(struct net *net) { return 0; } |
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static inline void ac6_proc_exit(struct net *net) { } |
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static inline int snmp6_register_dev(struct inet6_dev *idev) { return 0; } |
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static inline int snmp6_unregister_dev(struct inet6_dev *idev) { return 0; } |
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#endif |
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#ifdef CONFIG_SYSCTL |
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extern struct ctl_table ipv6_route_table_template[]; |
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struct ctl_table *ipv6_icmp_sysctl_init(struct net *net); |
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struct ctl_table *ipv6_route_sysctl_init(struct net *net); |
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int ipv6_sysctl_register(void); |
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void ipv6_sysctl_unregister(void); |
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#endif |
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int ipv6_sock_mc_join(struct sock *sk, int ifindex, |
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const struct in6_addr *addr); |
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int ipv6_sock_mc_drop(struct sock *sk, int ifindex, |
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const struct in6_addr *addr); |
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#endif /* _NET_IPV6_H */
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