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linux/include/net/ipv6.h
David S. Miller 14e50e57ae [XFRM]: Allow packet drops during larval state resolution. 
The current IPSEC rule resolution behavior we have does not work for a
lot of people, even though technically it's an improvement from the
-EAGAIN buisness we had before.

Right now we'll block until the key manager resolves the route.  That
works for simple cases, but many folks would rather packets get
silently dropped until the key manager resolves the IPSEC rules.

We can't tell these folks to "set the socket non-blocking" because
they don't have control over the non-block setting of things like the
sockets used to resolve DNS deep inside of the resolver libraries in
libc.

With that in mind I coded up the patch below with some help from
Herbert Xu which provides packet-drop behavior during larval state
resolution, controllable via sysctl and off by default.

This lays the framework to either:

1) Make this default at some point or...

2) Move this logic into xfrm{4,6}_policy.c and implement the
   ARP-like resolution queue we've all been dreaming of.
   The idea would be to queue packets to the policy, then
   once the larval state is resolved by the key manager we
   re-resolve the route and push the packets out.  The
   packets would timeout if the rule didn't get resolved
   in a certain amount of time.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-24 18:17:54 -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_MOBILITY 135 /* Mobility 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 {
__u8 nexthdr;
__u8 reserved;
__be16 frag_off;
__be32 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(idev,field) ({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS(_idev->stats.ipv6, field); \
SNMP_INC_STATS(ipv6_statistics, field); \
})
#define IP6_INC_STATS_BH(idev,field) ({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS_BH(_idev->stats.ipv6, field); \
SNMP_INC_STATS_BH(ipv6_statistics, field); \
})
#define IP6_INC_STATS_USER(idev,field) ({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS_USER(_idev->stats.ipv6, 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);
DECLARE_SNMP_STAT(struct udp_mib, udplite_stats_in6);
#define UDP6_INC_STATS_BH(field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_BH(udplite_stats_in6, field); \
else SNMP_INC_STATS_BH(udp_stats_in6, field); } while(0)
#define UDP6_INC_STATS_USER(field, is_udplite) do { \
if (is_udplite) SNMP_INC_STATS_USER(udplite_stats_in6, field); \
else SNMP_INC_STATS_USER(udp_stats_in6, field); } while(0)
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 *dst1opt;
/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
};
struct ip6_flowlabel
{
struct ip6_flowlabel *next;
__be32 label;
atomic_t users;
struct in6_addr dst;
struct ipv6_txoptions *opt;
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, __be32 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 **skbp);
extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
extern struct ipv6_txoptions * ipv6_renew_options(struct sock *sk, struct ipv6_txoptions *opt,
int newtype,
struct ipv6_opt_hdr __user *newopt,
int newoptlen);
struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
struct ipv6_txoptions *opt);
extern int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb);
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_type(const struct in6_addr *addr)
{
return __ipv6_addr_type(addr) & 0xffff;
}
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_src_scope(int type)
{
return (type == IPV6_ADDR_ANY ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16));
}
static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
{
return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
}
static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
{
return memcmp(a1, a2, sizeof(struct in6_addr));
}
static inline int
ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
const struct in6_addr *a2)
{
unsigned int i;
for (i = 0; i < 4; i++)
if ((a1->s6_addr32[i] ^ a2->s6_addr32[i]) & m->s6_addr32[i])
return 1;
return 0;
}
static inline void ipv6_addr_copy(struct in6_addr *a1, const struct in6_addr *a2)
{
memcpy(a1, 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;
memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
memcpy(pfx->s6_addr, addr, o);
if (b != 0)
pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
}
static inline void ipv6_addr_set(struct in6_addr *addr,
__be32 w1, __be32 w2,
__be32 w3, __be32 w4)
{
addr->s6_addr32[0] = w1;
addr->s6_addr32[1] = w2;
addr->s6_addr32[2] = w3;
addr->s6_addr32[3] = w4;
}
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 __be32 *a1, const __be32 *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);
}
/*
* find the first different bit between two addresses
* length of address must be a multiple of 32bits
*/
static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
{
const __be32 *a1 = token1, *a2 = token2;
int i;
addrlen >>= 2;
for (i = 0; i < addrlen; i++) {
__be32 xb = a1[i] ^ a2[i];
if (xb)
return i * 32 + 32 - fls(ntohl(xb));
}
/*
* we should *never* get to this point since that
* would mean the addrs are equal
*
* However, we do get to it 8) And exacly, when
* addresses are equal 8)
*
* ip route add 1111::/128 via ...
* ip route add 1111::/64 via ...
* and we are here.
*
* Ideally, this function should stop comparison
* at prefix length. It does not, but it is still OK,
* if returned value is greater than prefix length.
* --ANK (980803)
*/
return (addrlen << 5);
}
static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_addr *a2)
{
return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
}
/*
* 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,
struct net_device *orig_dev);
extern int ip6_rcv_finish(struct sk_buff *skb);
/*
* 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,
int tclass,
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);
extern int ip6_dst_blackhole(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
extern int ip6_sk_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 int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
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 int compat_ipv6_setsockopt(struct sock *sk,
int level,
int optname,
char __user *optval,
int optlen);
extern int compat_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, __be16 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);
extern int inet6_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk);
/*
* 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;
extern const struct proto_ops inet6_stream_ops;
extern const struct proto_ops inet6_dgram_ops;
struct group_source_req;
struct group_filter;
extern int ip6_mc_source(int add, int omode, struct sock *sk,
struct group_source_req *pgsr);
extern int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf);
extern int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
struct group_filter __user *optval,
int __user *optlen);
#ifdef CONFIG_PROC_FS
extern int ac6_proc_init(void);
extern void ac6_proc_exit(void);
extern int raw6_proc_init(void);
extern void raw6_proc_exit(void);
extern int tcp6_proc_init(void);
extern void tcp6_proc_exit(void);
extern int udp6_proc_init(void);
extern void udp6_proc_exit(void);
extern int udplite6_proc_init(void);
extern void udplite6_proc_exit(void);
extern int ipv6_misc_proc_init(void);
extern void ipv6_misc_proc_exit(void);
extern int snmp6_register_dev(struct inet6_dev *idev);
extern int snmp6_unregister_dev(struct inet6_dev *idev);
extern struct rt6_statistics rt6_stats;
#else
static inline int snmp6_register_dev(struct inet6_dev *idev)
{
return 0;
}
static inline int snmp6_unregister_dev(struct inet6_dev *idev)
{
return 0;
}
#endif
#ifdef CONFIG_SYSCTL
extern ctl_table ipv6_route_table[];
extern ctl_table ipv6_icmp_table[];
extern void ipv6_sysctl_register(void);
extern void ipv6_sysctl_unregister(void);
#endif
#endif /* __KERNEL__ */
#endif /* _NET_IPV6_H */
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