82b276cd2b
Some ipv6 protocols cannot handle ipv4 addresses, so we must not allow connecting and binding to them. sendmsg logic does already check msg->name for this but must trust already connected sockets which could be set up for connection to ipv4 address family. Per-socket flag ipv6only is of no use here, as it is under users control by setsockopt. Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
854 lines
24 KiB
C
854 lines
24 KiB
C
/*
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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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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#ifndef _NET_IPV6_H
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#define _NET_IPV6_H
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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/snmp.h>
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#define SIN6_LEN_RFC2133 24
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#define IPV6_MAXPLEN 65535
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/*
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* NextHeader field of IPv6 header
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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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#define NEXTHDR_MAX 255
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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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* 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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#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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#define IPV6_ADDR_MAPPED 0x1000U
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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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* 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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* 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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#define IP6_MF 0x0001
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#define IP6_OFFSET 0xFFF8
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#include <net/sock.h>
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/* sysctls */
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extern int sysctl_mld_max_msf;
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#define _DEVINC(net, statname, modifier, 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##modifier((_idev)->stats.statname, (field)); \
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SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
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})
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/* per device counters are atomic_long_t */
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#define _DEVINCATOMIC(net, statname, modifier, 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##modifier((net)->mib.statname##_statistics, (field));\
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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, modifier, 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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SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
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SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
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})
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#define _DEVUPD(net, statname, modifier, 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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SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
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SNMP_UPD_PO_STATS##modifier((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, 64, idev, field)
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#define IP6_INC_STATS_BH(net, idev,field) \
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_DEVINC(net, ipv6, 64_BH, idev, field)
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#define IP6_ADD_STATS(net, idev,field,val) \
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_DEVADD(net, ipv6, 64, idev, field, val)
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#define IP6_ADD_STATS_BH(net, idev,field,val) \
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_DEVADD(net, ipv6, 64_BH, idev, field, val)
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#define IP6_UPD_PO_STATS(net, idev,field,val) \
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_DEVUPD(net, ipv6, 64, idev, field, val)
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#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
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_DEVUPD(net, ipv6, 64_BH, 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_BH(net, idev, field) \
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_DEVINCATOMIC(net, icmpv6, _BH, idev, field)
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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 ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
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_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
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#define ICMP6MSGIN_INC_STATS_BH(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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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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/* Length of this structure */
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int tot_len;
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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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/* 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_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 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 *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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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_nqueues(struct net *net)
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{
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return net->ipv6.frags.nqueues;
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}
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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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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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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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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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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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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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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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#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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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;
|
|
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, void *a);
|
|
bool ip6_frag_match(struct inet_frag_queue *q, 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 unsigned long *ul = (const unsigned long *)a;
|
|
|
|
return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
|
|
#else
|
|
return (a->s6_addr32[0] | a->s6_addr32[1] |
|
|
a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
|
|
#endif
|
|
}
|
|
|
|
static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
|
|
{
|
|
return (
|
|
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
|
|
*(__be64 *)a |
|
|
#else
|
|
(a->s6_addr32[0] | a->s6_addr32[1]) |
|
|
#endif
|
|
(a->s6_addr32[2] ^ htonl(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 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));
|
|
}
|
|
|
|
void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
|
|
|
|
int ip6_dst_hoplimit(struct dst_entry *dst);
|
|
|
|
/*
|
|
* 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 sk_buff *skb);
|
|
|
|
/*
|
|
* upper-layer output functions
|
|
*/
|
|
int ip6_xmit(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_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6);
|
|
struct dst_entry *ip6_dst_lookup_flow(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 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 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
|
|
|
|
#endif /* _NET_IPV6_H */
|