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linux/include/net/ipv6.h
Herbert Xu 0d3d077cd4 [SELINUX]: Fix ipv6_skip_exthdr() invocation causing OOPS. 
The SELinux hooks invoke ipv6_skip_exthdr() with an incorrect
length final argument.  However, the length argument turns out
to be superfluous.

I was just reading ipv6_skip_exthdr and it occured to me that we can
get rid of len altogether.  The only place where len is used is to
check whether the skb has two bytes for ipv6_opt_hdr.  This check
is done by skb_header_pointer/skb_copy_bits anyway.

Now it might appear that we've made the code slower by deferring
the check to skb_copy_bits.  However, this check should not trigger
in the common case so this is OK.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-04-24 20:16:19 -07:00

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/*
* 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);
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 */
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