472 lines
12 KiB
C
472 lines
12 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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* $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm Exp $
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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 <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_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_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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#define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
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/*
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* Addr scopes
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*/
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#ifdef __KERNEL__
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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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#endif
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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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* fragmentation header
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*/
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struct frag_hdr {
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unsigned char nexthdr;
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unsigned char reserved;
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unsigned short frag_off;
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__u32 identification;
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};
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#define IP6_MF 0x0001
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#ifdef __KERNEL__
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#include <net/sock.h>
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/* sysctls */
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extern int sysctl_ipv6_bindv6only;
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extern int sysctl_mld_max_msf;
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/* MIBs */
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DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics);
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#define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
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#define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
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#define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
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DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
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#define ICMP6_INC_STATS(idev, field) ({ \
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struct inet6_dev *_idev = (idev); \
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if (likely(_idev != NULL)) \
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SNMP_INC_STATS(idev->stats.icmpv6, field); \
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SNMP_INC_STATS(icmpv6_statistics, field); \
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})
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#define ICMP6_INC_STATS_BH(idev, field) ({ \
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struct inet6_dev *_idev = (idev); \
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if (likely(_idev != NULL)) \
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SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \
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SNMP_INC_STATS_BH(icmpv6_statistics, field); \
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})
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#define ICMP6_INC_STATS_USER(idev, field) ({ \
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struct inet6_dev *_idev = (idev); \
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if (likely(_idev != NULL)) \
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SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \
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SNMP_INC_STATS_USER(icmpv6_statistics, field); \
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})
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#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \
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struct inet6_dev *_idev = idev; \
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__typeof__(offset) _offset = (offset); \
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if (likely(_idev != NULL)) \
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SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \
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SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \
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})
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DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6);
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#define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
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#define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
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#define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
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extern atomic_t inet6_sock_nr;
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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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int snmp6_alloc_dev(struct inet6_dev *idev);
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int snmp6_free_dev(struct inet6_dev *idev);
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int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign);
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void snmp6_mib_free(void *ptr[2]);
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struct ip6_ra_chain
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{
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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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{
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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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{
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struct ip6_flowlabel *next;
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u32 label;
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struct in6_addr dst;
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struct ipv6_txoptions *opt;
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atomic_t users;
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unsigned long linger;
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u8 share;
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u32 owner;
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unsigned long lastuse;
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unsigned long expires;
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};
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#define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
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#define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
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struct ipv6_fl_socklist
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{
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struct ipv6_fl_socklist *next;
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struct ip6_flowlabel *fl;
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};
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extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
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extern 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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extern void fl6_free_socklist(struct sock *sk);
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extern int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
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extern void ip6_flowlabel_init(void);
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extern 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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extern int ip6_ra_control(struct sock *sk, int sel,
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void (*destructor)(struct sock *));
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extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
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extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
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extern int ip6_frag_nqueues;
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extern atomic_t ip6_frag_mem;
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#define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
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/*
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* Function prototype for build_xmit
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*/
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typedef int (*inet_getfrag_t) (const void *data,
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struct in6_addr *addr,
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char *,
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unsigned int, unsigned int);
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extern int ipv6_addr_type(const struct in6_addr *addr);
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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_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
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{
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return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr));
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}
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static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
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{
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memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr));
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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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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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o++;
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}
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if (o < 16)
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memset(pfx->s6_addr + o, 0, 16 - o);
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}
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#ifndef __HAVE_ARCH_ADDR_SET
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static inline void ipv6_addr_set(struct in6_addr *addr,
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__u32 w1, __u32 w2,
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__u32 w3, __u32 w4)
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{
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addr->s6_addr32[0] = w1;
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addr->s6_addr32[1] = w2;
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addr->s6_addr32[2] = w3;
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addr->s6_addr32[3] = w4;
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}
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#endif
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static inline int 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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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]);
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}
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static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2,
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unsigned int prefixlen)
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{
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unsigned pdw, pbi;
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/* check complete u32 in prefix */
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pdw = prefixlen >> 5;
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if (pdw && memcmp(a1, a2, pdw << 2))
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return 0;
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/* check incomplete u32 in prefix */
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pbi = prefixlen & 0x1f;
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if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
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return 0;
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return 1;
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}
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static inline int ipv6_prefix_equal(const struct in6_addr *a1,
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const struct in6_addr *a2,
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unsigned int prefixlen)
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{
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return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32,
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prefixlen);
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}
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static inline int ipv6_addr_any(const struct in6_addr *a)
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{
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return ((a->s6_addr32[0] | a->s6_addr32[1] |
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a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
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}
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/*
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* Prototypes exported by ipv6
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*/
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/*
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* rcv function (called from netdevice level)
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*/
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extern int ipv6_rcv(struct sk_buff *skb,
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struct net_device *dev,
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struct packet_type *pt);
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/*
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* upper-layer output functions
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*/
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extern int ip6_xmit(struct sock *sk,
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struct sk_buff *skb,
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struct flowi *fl,
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struct ipv6_txoptions *opt,
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int ipfragok);
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extern int ip6_nd_hdr(struct sock *sk,
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struct sk_buff *skb,
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struct net_device *dev,
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struct in6_addr *saddr,
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struct in6_addr *daddr,
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int proto, int len);
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extern int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);
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extern int ip6_append_data(struct sock *sk,
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int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb),
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void *from,
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int length,
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int transhdrlen,
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int hlimit,
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struct ipv6_txoptions *opt,
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struct flowi *fl,
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struct rt6_info *rt,
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unsigned int flags);
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extern int ip6_push_pending_frames(struct sock *sk);
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extern void ip6_flush_pending_frames(struct sock *sk);
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extern int ip6_dst_lookup(struct sock *sk,
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struct dst_entry **dst,
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struct flowi *fl);
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/*
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* skb processing functions
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*/
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extern int ip6_output(struct sk_buff *skb);
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extern int ip6_forward(struct sk_buff *skb);
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extern int ip6_input(struct sk_buff *skb);
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extern int ip6_mc_input(struct sk_buff *skb);
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/*
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* Extension header (options) processing
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*/
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extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
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u8 *prev_hdr,
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struct ipv6_txoptions *opt,
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struct in6_addr *daddr,
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u32 jumbolen);
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extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
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u8 *prev_hdr,
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struct ipv6_txoptions *opt);
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extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
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struct ipv6_txoptions *opt,
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u8 *proto,
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struct in6_addr **daddr_p);
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extern void ipv6_push_frag_opts(struct sk_buff *skb,
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struct ipv6_txoptions *opt,
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u8 *proto);
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extern int ipv6_skip_exthdr(const struct sk_buff *, int start,
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u8 *nexthdrp);
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extern int ipv6_ext_hdr(u8 nexthdr);
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extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
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struct ipv6_rt_hdr *hdr);
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/*
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* socket options (ipv6_sockglue.c)
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*/
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extern int ipv6_setsockopt(struct sock *sk, int level,
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int optname,
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char __user *optval,
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int optlen);
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extern int ipv6_getsockopt(struct sock *sk, int level,
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int optname,
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char __user *optval,
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int __user *optlen);
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extern void ipv6_packet_init(void);
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extern void ipv6_packet_cleanup(void);
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extern int ip6_datagram_connect(struct sock *sk,
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struct sockaddr *addr, int addr_len);
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extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
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extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
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u32 info, u8 *payload);
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extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
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extern int inet6_release(struct socket *sock);
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extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr,
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int addr_len);
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extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer);
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extern int inet6_ioctl(struct socket *sock, unsigned int cmd,
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unsigned long arg);
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/*
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* reassembly.c
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*/
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extern int sysctl_ip6frag_high_thresh;
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extern int sysctl_ip6frag_low_thresh;
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extern int sysctl_ip6frag_time;
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extern int sysctl_ip6frag_secret_interval;
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#endif /* __KERNEL__ */
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#endif /* _NET_IPV6_H */
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