ipv6.h
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上传日期:2013-04-10
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- /*
- * Linux INET6 implementation
- *
- * Authors:
- * Pedro Roque <roque@di.fc.ul.pt>
- *
- * $Id: ipv6.h,v 1.23 2000/12/13 18:31:48 davem Exp $
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _NET_IPV6_H
- #define _NET_IPV6_H
- #include <linux/ipv6.h>
- #include <asm/hardirq.h>
- #include <net/ndisc.h>
- #include <net/flow.h>
- #define SIN6_LEN_RFC2133 24
- /*
- * NextHeader field of IPv6 header
- */
- #define NEXTHDR_HOP 0 /* Hop-by-hop option header. */
- #define NEXTHDR_TCP 6 /* TCP segment. */
- #define NEXTHDR_UDP 17 /* UDP message. */
- #define NEXTHDR_IPV6 41 /* IPv6 in IPv6 */
- #define NEXTHDR_ROUTING 43 /* Routing header. */
- #define NEXTHDR_FRAGMENT 44 /* Fragmentation/reassembly header. */
- #define NEXTHDR_ESP 50 /* Encapsulating security payload. */
- #define NEXTHDR_AUTH 51 /* Authentication header. */
- #define NEXTHDR_ICMP 58 /* ICMP for IPv6. */
- #define NEXTHDR_NONE 59 /* No next header */
- #define NEXTHDR_DEST 60 /* Destination options header. */
- #define NEXTHDR_MAX 255
- #define IPV6_DEFAULT_HOPLIMIT 64
- #define IPV6_DEFAULT_MCASTHOPS 1
- /*
- * Addr type
- *
- * type - unicast | multicast | anycast
- * scope - local | site | global
- * v4 - compat
- * v4mapped
- * any
- * loopback
- */
- #define IPV6_ADDR_ANY 0x0000U
- #define IPV6_ADDR_UNICAST 0x0001U
- #define IPV6_ADDR_MULTICAST 0x0002U
- #define IPV6_ADDR_ANYCAST 0x0004U
- #define IPV6_ADDR_LOOPBACK 0x0010U
- #define IPV6_ADDR_LINKLOCAL 0x0020U
- #define IPV6_ADDR_SITELOCAL 0x0040U
- #define IPV6_ADDR_COMPATv4 0x0080U
- #define IPV6_ADDR_SCOPE_MASK 0x00f0U
- #define IPV6_ADDR_MAPPED 0x1000U
- #define IPV6_ADDR_RESERVED 0x2000U /* reserved address space */
- /*
- * fragmentation header
- */
- struct frag_hdr {
- unsigned char nexthdr;
- unsigned char reserved;
- unsigned short frag_off;
- __u32 identification;
- };
- #ifdef __KERNEL__
- #include <net/sock.h>
- extern struct ipv6_mib ipv6_statistics[NR_CPUS*2];
- #define IP6_INC_STATS(field) SNMP_INC_STATS(ipv6_statistics, field)
- #define IP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(ipv6_statistics, field)
- #define IP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(ipv6_statistics, field)
- extern struct icmpv6_mib icmpv6_statistics[NR_CPUS*2];
- #define ICMP6_INC_STATS(field) SNMP_INC_STATS(icmpv6_statistics, field)
- #define ICMP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(icmpv6_statistics, field)
- #define ICMP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(icmpv6_statistics, field)
- extern struct udp_mib udp_stats_in6[NR_CPUS*2];
- #define UDP6_INC_STATS(field) SNMP_INC_STATS(udp_stats_in6, field)
- #define UDP6_INC_STATS_BH(field) SNMP_INC_STATS_BH(udp_stats_in6, field)
- #define UDP6_INC_STATS_USER(field) SNMP_INC_STATS_USER(udp_stats_in6, field)
- extern atomic_t inet6_sock_nr;
- struct ip6_ra_chain
- {
- struct ip6_ra_chain *next;
- struct sock *sk;
- int sel;
- void (*destructor)(struct sock *);
- };
- extern struct ip6_ra_chain *ip6_ra_chain;
- extern rwlock_t ip6_ra_lock;
- /*
- This structure is prepared by protocol, when parsing
- ancillary data and passed to IPv6.
- */
- struct ipv6_txoptions
- {
- /* Length of this structure */
- int tot_len;
- /* length of extension headers */
- __u16 opt_flen; /* after fragment hdr */
- __u16 opt_nflen; /* before fragment hdr */
- struct ipv6_opt_hdr *hopopt;
- struct ipv6_opt_hdr *dst0opt;
- struct ipv6_rt_hdr *srcrt; /* Routing Header */
- struct ipv6_opt_hdr *auth;
- struct ipv6_opt_hdr *dst1opt;
- /* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
- };
- struct ip6_flowlabel
- {
- struct ip6_flowlabel *next;
- u32 label;
- struct in6_addr dst;
- struct ipv6_txoptions *opt;
- atomic_t users;
- u32 linger;
- u8 share;
- u32 owner;
- unsigned long lastuse;
- unsigned long expires;
- };
- #define IPV6_FLOWINFO_MASK __constant_htonl(0x0FFFFFFF)
- #define IPV6_FLOWLABEL_MASK __constant_htonl(0x000FFFFF)
- struct ipv6_fl_socklist
- {
- struct ipv6_fl_socklist *next;
- struct ip6_flowlabel *fl;
- };
- extern struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, u32 label);
- extern struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
- struct ip6_flowlabel * fl,
- struct ipv6_txoptions * fopt);
- extern void fl6_free_socklist(struct sock *sk);
- extern int ipv6_flowlabel_opt(struct sock *sk, char *optval, int optlen);
- extern void ip6_flowlabel_init(void);
- extern void ip6_flowlabel_cleanup(void);
- static inline void fl6_sock_release(struct ip6_flowlabel *fl)
- {
- if (fl)
- atomic_dec(&fl->users);
- }
- extern int ip6_ra_control(struct sock *sk, int sel,
- void (*destructor)(struct sock *));
- extern int ip6_call_ra_chain(struct sk_buff *skb, int sel);
- extern int ipv6_reassembly(struct sk_buff **skb, int);
- extern int ipv6_parse_hopopts(struct sk_buff *skb, int);
- extern int ipv6_parse_exthdrs(struct sk_buff **skb, int);
- extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
- extern int ip6_frag_nqueues;
- extern atomic_t ip6_frag_mem;
- #define IPV6_FRAG_TIMEOUT (60*HZ) /* 60 seconds */
- /*
- * Function prototype for build_xmit
- */
- typedef int (*inet_getfrag_t) (const void *data,
- struct in6_addr *addr,
- char *,
- unsigned int, unsigned int);
- extern int ipv6_addr_type(struct in6_addr *addr);
- static inline int ipv6_addr_scope(struct in6_addr *addr)
- {
- return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
- }
- static inline int ipv6_addr_cmp(struct in6_addr *a1, struct in6_addr *a2)
- {
- return memcmp((void *) a1, (void *) a2, sizeof(struct in6_addr));
- }
- static inline void ipv6_addr_copy(struct in6_addr *a1, struct in6_addr *a2)
- {
- memcpy((void *) a1, (void *) a2, sizeof(struct in6_addr));
- }
- #ifndef __HAVE_ARCH_ADDR_SET
- static inline void ipv6_addr_set(struct in6_addr *addr,
- __u32 w1, __u32 w2,
- __u32 w3, __u32 w4)
- {
- addr->s6_addr32[0] = w1;
- addr->s6_addr32[1] = w2;
- addr->s6_addr32[2] = w3;
- addr->s6_addr32[3] = w4;
- }
- #endif
- static inline int ipv6_addr_any(struct in6_addr *a)
- {
- return ((a->s6_addr32[0] | a->s6_addr32[1] |
- a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
- }
- /*
- * Prototypes exported by ipv6
- */
- /*
- * rcv function (called from netdevice level)
- */
- extern int ipv6_rcv(struct sk_buff *skb,
- struct net_device *dev,
- struct packet_type *pt);
- /*
- * upper-layer output functions
- */
- extern int ip6_xmit(struct sock *sk,
- struct sk_buff *skb,
- struct flowi *fl,
- struct ipv6_txoptions *opt);
- extern int ip6_nd_hdr(struct sock *sk,
- struct sk_buff *skb,
- struct net_device *dev,
- struct in6_addr *saddr,
- struct in6_addr *daddr,
- int proto, int len);
- extern int ip6_build_xmit(struct sock *sk,
- inet_getfrag_t getfrag,
- const void *data,
- struct flowi *fl,
- unsigned length,
- struct ipv6_txoptions *opt,
- int hlimit, int flags);
- /*
- * skb processing functions
- */
- extern int ip6_output(struct sk_buff *skb);
- extern int ip6_forward(struct sk_buff *skb);
- extern int ip6_input(struct sk_buff *skb);
- extern int ip6_mc_input(struct sk_buff *skb);
- /*
- * Extension header (options) processing
- */
- extern u8 * ipv6_build_nfrag_opts(struct sk_buff *skb,
- u8 *prev_hdr,
- struct ipv6_txoptions *opt,
- struct in6_addr *daddr,
- u32 jumbolen);
- extern u8 * ipv6_build_frag_opts(struct sk_buff *skb,
- u8 *prev_hdr,
- struct ipv6_txoptions *opt);
- extern void ipv6_push_nfrag_opts(struct sk_buff *skb,
- struct ipv6_txoptions *opt,
- u8 *proto,
- struct in6_addr **daddr_p);
- extern void ipv6_push_frag_opts(struct sk_buff *skb,
- struct ipv6_txoptions *opt,
- u8 *proto);
- extern int ipv6_skip_exthdr(struct sk_buff *, int start,
- u8 *nexthdrp, int len);
- extern int ipv6_ext_hdr(u8 nexthdr);
- extern struct ipv6_txoptions * ipv6_invert_rthdr(struct sock *sk,
- struct ipv6_rt_hdr *hdr);
- /*
- * socket options (ipv6_sockglue.c)
- */
- extern int ipv6_setsockopt(struct sock *sk, int level,
- int optname, char *optval,
- int optlen);
- extern int ipv6_getsockopt(struct sock *sk, int level,
- int optname, char *optval,
- int *optlen);
- extern void ipv6_packet_init(void);
- extern void ipv6_netdev_notif_init(void);
- extern void ipv6_packet_cleanup(void);
- extern void ipv6_netdev_notif_cleanup(void);
- extern int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len);
- extern void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, u16 port,
- u32 info, u8 *payload);
- extern void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info);
- #endif /* __KERNEL__ */
- #endif /* _NET_IPV6_H */