/* * Linux INET6 implementation * * Authors: * Pedro Roque * * $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 #include #include #include #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 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 */