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Diffstat (limited to 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h new file mode 100644 index 000000000000..87c45cbfbaf6 --- /dev/null +++ b/include/net/ipv6.h @@ -0,0 +1,472 @@ +/* + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * $Id: ipv6.h,v 1.1 2002/05/20 15:13:07 jgrimm 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 <linux/hardirq.h> +#include <net/ndisc.h> +#include <net/flow.h> +#include <net/snmp.h> + +#define SIN6_LEN_RFC2133 24 + +#define IPV6_MAXPLEN 65535 + +/* + * 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 + * 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_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 */ + +/* + * Addr scopes + */ +#ifdef __KERNEL__ +#define IPV6_ADDR_MC_SCOPE(a) \ + ((a)->s6_addr[1] & 0x0f) /* nonstandard */ +#define __IPV6_ADDR_SCOPE_INVALID -1 +#endif +#define IPV6_ADDR_SCOPE_NODELOCAL 0x01 +#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02 +#define IPV6_ADDR_SCOPE_SITELOCAL 0x05 +#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08 +#define IPV6_ADDR_SCOPE_GLOBAL 0x0e + +/* + * fragmentation header + */ + +struct frag_hdr { + unsigned char nexthdr; + unsigned char reserved; + unsigned short frag_off; + __u32 identification; +}; + +#define IP6_MF 0x0001 + +#ifdef __KERNEL__ + +#include <net/sock.h> + +/* sysctls */ +extern int sysctl_ipv6_bindv6only; +extern int sysctl_mld_max_msf; + +/* MIBs */ +DECLARE_SNMP_STAT(struct ipstats_mib, ipv6_statistics); +#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) +DECLARE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); +#define ICMP6_INC_STATS(idev, field) ({ \ + struct inet6_dev *_idev = (idev); \ + if (likely(_idev != NULL)) \ + SNMP_INC_STATS(idev->stats.icmpv6, field); \ + SNMP_INC_STATS(icmpv6_statistics, field); \ +}) +#define ICMP6_INC_STATS_BH(idev, field) ({ \ + struct inet6_dev *_idev = (idev); \ + if (likely(_idev != NULL)) \ + SNMP_INC_STATS_BH((_idev)->stats.icmpv6, field); \ + SNMP_INC_STATS_BH(icmpv6_statistics, field); \ +}) +#define ICMP6_INC_STATS_USER(idev, field) ({ \ + struct inet6_dev *_idev = (idev); \ + if (likely(_idev != NULL)) \ + SNMP_INC_STATS_USER(_idev->stats.icmpv6, field); \ + SNMP_INC_STATS_USER(icmpv6_statistics, field); \ +}) +#define ICMP6_INC_STATS_OFFSET_BH(idev, field, offset) ({ \ + struct inet6_dev *_idev = idev; \ + __typeof__(offset) _offset = (offset); \ + if (likely(_idev != NULL)) \ + SNMP_INC_STATS_OFFSET_BH(_idev->stats.icmpv6, field, _offset); \ + SNMP_INC_STATS_OFFSET_BH(icmpv6_statistics, field, _offset); \ +}) +DECLARE_SNMP_STAT(struct udp_mib, udp_stats_in6); +#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; + +int snmp6_register_dev(struct inet6_dev *idev); +int snmp6_unregister_dev(struct inet6_dev *idev); +int snmp6_alloc_dev(struct inet6_dev *idev); +int snmp6_free_dev(struct inet6_dev *idev); +int snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign); +void snmp6_mib_free(void *ptr[2]); + +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; + unsigned long 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 __user *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 ipv6_parse_hopopts(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(const struct in6_addr *addr); + +static inline int ipv6_addr_scope(const struct in6_addr *addr) +{ + return ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK; +} + +static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2) +{ + return memcmp((const void *) a1, (const void *) a2, sizeof(struct in6_addr)); +} + +static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2) +{ + memcpy((void *) a1, (const void *) a2, sizeof(struct in6_addr)); +} + +static inline void ipv6_addr_prefix(struct in6_addr *pfx, + const struct in6_addr *addr, + int plen) +{ + /* caller must guarantee 0 <= plen <= 128 */ + int o = plen >> 3, + b = plen & 0x7; + + memcpy(pfx->s6_addr, addr, o); + if (b != 0) { + pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b); + o++; + } + if (o < 16) + memset(pfx->s6_addr + o, 0, 16 - o); +} + +#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_equal(const struct in6_addr *a1, + const struct in6_addr *a2) +{ + return (a1->s6_addr32[0] == a2->s6_addr32[0] && + a1->s6_addr32[1] == a2->s6_addr32[1] && + a1->s6_addr32[2] == a2->s6_addr32[2] && + a1->s6_addr32[3] == a2->s6_addr32[3]); +} + +static inline int __ipv6_prefix_equal(const u32 *a1, const u32 *a2, + unsigned int prefixlen) +{ + unsigned pdw, pbi; + + /* check complete u32 in prefix */ + pdw = prefixlen >> 5; + if (pdw && memcmp(a1, a2, pdw << 2)) + return 0; + + /* check incomplete u32 in prefix */ + pbi = prefixlen & 0x1f; + if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi)))) + return 0; + + return 1; +} + +static inline int ipv6_prefix_equal(const struct in6_addr *a1, + const struct in6_addr *a2, + unsigned int prefixlen) +{ + return __ipv6_prefix_equal(a1->s6_addr32, a2->s6_addr32, + prefixlen); +} + +static inline int ipv6_addr_any(const 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, + int ipfragok); + +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_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr); + +extern 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, + struct ipv6_txoptions *opt, + struct flowi *fl, + struct rt6_info *rt, + unsigned int flags); + +extern int ip6_push_pending_frames(struct sock *sk); + +extern void ip6_flush_pending_frames(struct sock *sk); + +extern int ip6_dst_lookup(struct sock *sk, + struct dst_entry **dst, + struct flowi *fl); + +/* + * 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(const 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 __user *optval, + int optlen); +extern int ipv6_getsockopt(struct sock *sk, int level, + int optname, + char __user *optval, + int __user *optlen); + +extern void ipv6_packet_init(void); + +extern void ipv6_packet_cleanup(void); + +extern int ip6_datagram_connect(struct sock *sk, + struct sockaddr *addr, int addr_len); + +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); + +extern int inet6_release(struct socket *sock); +extern int inet6_bind(struct socket *sock, struct sockaddr *uaddr, + int addr_len); +extern int inet6_getname(struct socket *sock, struct sockaddr *uaddr, + int *uaddr_len, int peer); +extern int inet6_ioctl(struct socket *sock, unsigned int cmd, + unsigned long arg); + +/* + * reassembly.c + */ +extern int sysctl_ip6frag_high_thresh; +extern int sysctl_ip6frag_low_thresh; +extern int sysctl_ip6frag_time; +extern int sysctl_ip6frag_secret_interval; + +#endif /* __KERNEL__ */ +#endif /* _NET_IPV6_H */ + + + |