linux/include/net/ipv6.h

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/*
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
*
* 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 <linux/jhash.h>
#include <net/if_inet6.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_GRE 47 /* GRE 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
/*
* Addr scopes
*/
#define IPV6_ADDR_MC_SCOPE(a) \
((a)->s6_addr[1] & 0x0f) /* nonstandard */
#define __IPV6_ADDR_SCOPE_INVALID -1
#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
/*
* Addr flags
*/
#define IPV6_ADDR_MC_FLAG_TRANSIENT(a) \
((a)->s6_addr[1] & 0x10)
#define IPV6_ADDR_MC_FLAG_PREFIX(a) \
((a)->s6_addr[1] & 0x20)
#define IPV6_ADDR_MC_FLAG_RENDEZVOUS(a) \
((a)->s6_addr[1] & 0x40)
/*
* fragmentation header
*/
struct frag_hdr {
__u8 nexthdr;
__u8 reserved;
__be16 frag_off;
__be32 identification;
};
#define IP6_MF 0x0001
#include <net/sock.h>
/* sysctls */
extern int sysctl_mld_max_msf;
#define _DEVINC(net, statname, modifier, idev, field) \
({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS##modifier((_idev)->stats.statname, (field)); \
SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
})
/* per device counters are atomic_long_t */
#define _DEVINCATOMIC(net, statname, modifier, idev, field) \
({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
SNMP_INC_STATS##modifier((net)->mib.statname##_statistics, (field));\
})
/* per device and per net counters are atomic_long_t */
#define _DEVINC_ATOMIC_ATOMIC(net, statname, idev, field) \
({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
})
#define _DEVADD(net, statname, modifier, idev, field, val) \
({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_ADD_STATS##modifier((_idev)->stats.statname, (field), (val)); \
SNMP_ADD_STATS##modifier((net)->mib.statname##_statistics, (field), (val));\
})
#define _DEVUPD(net, statname, modifier, idev, field, val) \
({ \
struct inet6_dev *_idev = (idev); \
if (likely(_idev != NULL)) \
SNMP_UPD_PO_STATS##modifier((_idev)->stats.statname, field, (val)); \
SNMP_UPD_PO_STATS##modifier((net)->mib.statname##_statistics, field, (val));\
})
/* MIBs */
#define IP6_INC_STATS(net, idev,field) \
_DEVINC(net, ipv6, 64, idev, field)
#define IP6_INC_STATS_BH(net, idev,field) \
_DEVINC(net, ipv6, 64_BH, idev, field)
#define IP6_ADD_STATS(net, idev,field,val) \
_DEVADD(net, ipv6, 64, idev, field, val)
#define IP6_ADD_STATS_BH(net, idev,field,val) \
_DEVADD(net, ipv6, 64_BH, idev, field, val)
#define IP6_UPD_PO_STATS(net, idev,field,val) \
_DEVUPD(net, ipv6, 64, idev, field, val)
#define IP6_UPD_PO_STATS_BH(net, idev,field,val) \
_DEVUPD(net, ipv6, 64_BH, idev, field, val)
#define ICMP6_INC_STATS(net, idev, field) \
_DEVINCATOMIC(net, icmpv6, , idev, field)
#define ICMP6_INC_STATS_BH(net, idev, field) \
_DEVINCATOMIC(net, icmpv6, _BH, idev, field)
#define ICMP6MSGOUT_INC_STATS(net, idev, field) \
_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
#define ICMP6MSGOUT_INC_STATS_BH(net, idev, field) \
_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
#define ICMP6MSGIN_INC_STATS_BH(net, idev, field) \
_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
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;
struct rcu_head rcu;
u8 share;
union {
struct pid *pid;
kuid_t uid;
} owner;
unsigned long lastuse;
unsigned long expires;
struct net *fl_net;
};
#define IPV6_FLOWINFO_MASK cpu_to_be32(0x0FFFFFFF)
#define IPV6_FLOWLABEL_MASK cpu_to_be32(0x000FFFFF)
struct ipv6_fl_socklist {
struct ipv6_fl_socklist *next;
struct ip6_flowlabel *fl;
struct rcu_head rcu;
};
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 int 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 void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
extern int ip6_ra_control(struct sock *sk, int sel);
extern int ipv6_parse_hopopts(struct sk_buff *skb);
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 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb);
static inline bool ipv6_accept_ra(struct inet6_dev *idev)
{
/* If forwarding is enabled, RA are not accepted unless the special
* hybrid mode (accept_ra=2) is enabled.
*/
return idev->cnf.forwarding ? idev->cnf.accept_ra == 2 :
idev->cnf.accept_ra;
}
#if IS_ENABLED(CONFIG_IPV6)
static inline int ip6_frag_nqueues(struct net *net)
{
return net->ipv6.frags.nqueues;
}
static inline int ip6_frag_mem(struct net *net)
{
return sum_frag_mem_limit(&net->ipv6.frags);
}
#endif
net: increase fragment memory usage limits Increase the amount of memory usage limits for incomplete IP fragments. Arguing for new thresh high/low values: High threshold = 4 MBytes Low threshold = 3 MBytes The fragmentation memory accounting code, tries to account for the real memory usage, by measuring both the size of frag queue struct (inet_frag_queue (ipv4:ipq/ipv6:frag_queue)) and the SKB's truesize. We want to be able to handle/hold-on-to enough fragments, to ensure good performance, without causing incomplete fragments to hurt scalability, by causing the number of inet_frag_queue to grow too much (resulting longer searches for frag queues). For IPv4, how much memory does the largest frag consume. Maximum size fragment is 64K, which is approx 44 fragments with MTU(1500) sized packets. Sizeof(struct ipq) is 200. A 1500 byte packet results in a truesize of 2944 (not 2048 as I first assumed) (44*2944)+200 = 129736 bytes The current default high thresh of 262144 bytes, is obviously problematic, as only two 64K fragments can fit in the queue at the same time. How many 64K fragment can we fit into 4 MBytes: 4*2^20/((44*2944)+200) = 32.34 fragment in queues An attacker could send a separate/distinct fake fragment packets per queue, causing us to allocate one inet_frag_queue per packet, and thus attacking the hash table and its lists. How many frag queue do we need to store, and given a current hash size of 64, what is the average list length. Using one MTU sized fragment per inet_frag_queue, each consuming (2944+200) 3144 bytes. 4*2^20/(2944+200) = 1334 frag queues -> 21 avg list length An attack could send small fragments, the smallest packet I could send resulted in a truesize of 896 bytes (I'm a little surprised by this). 4*2^20/(896+200) = 3827 frag queues -> 59 avg list length When increasing these number, we also need to followup with improvements, that is going to help scalability. Simply increasing the hash size, is not enough as the current implementation does not have a per hash bucket locking. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-01-15 07:16:35 +00:00
#define IPV6_FRAG_HIGH_THRESH (4 * 1024*1024) /* 4194304 */
#define IPV6_FRAG_LOW_THRESH (3 * 1024*1024) /* 3145728 */
#define IPV6_FRAG_TIMEOUT (60 * HZ) /* 60 seconds */
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 bool
ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
const struct in6_addr *a2)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul1 = (const unsigned long *)a1;
const unsigned long *ulm = (const unsigned long *)m;
const unsigned long *ul2 = (const unsigned long *)a2;
return !!(((ul1[0] ^ ul2[0]) & ulm[0]) |
((ul1[1] ^ ul2[1]) & ulm[1]));
#else
return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |
((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |
((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |
((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));
#endif
}
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_half(__be32 *addr,
__be32 wh, __be32 wl)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
#if defined(__BIG_ENDIAN)
if (__builtin_constant_p(wh) && __builtin_constant_p(wl)) {
*(__force u64 *)addr = ((__force u64)(wh) << 32 | (__force u64)(wl));
return;
}
#elif defined(__LITTLE_ENDIAN)
if (__builtin_constant_p(wl) && __builtin_constant_p(wh)) {
*(__force u64 *)addr = ((__force u64)(wl) << 32 | (__force u64)(wh));
return;
}
#endif
#endif
addr[0] = wh;
addr[1] = wl;
}
static inline void ipv6_addr_set(struct in6_addr *addr,
__be32 w1, __be32 w2,
__be32 w3, __be32 w4)
{
__ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
__ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
}
static inline bool ipv6_addr_equal(const struct in6_addr *a1,
const struct in6_addr *a2)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul1 = (const unsigned long *)a1;
const unsigned long *ul2 = (const unsigned long *)a2;
return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
#else
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])) == 0;
#endif
}
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
const __be64 *a2,
unsigned int len)
{
if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
return false;
return true;
}
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
const struct in6_addr *addr2,
unsigned int prefixlen)
{
const __be64 *a1 = (const __be64 *)addr1;
const __be64 *a2 = (const __be64 *)addr2;
if (prefixlen >= 64) {
if (a1[0] ^ a2[0])
return false;
return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
}
return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
}
#else
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
const struct in6_addr *addr2,
unsigned int prefixlen)
{
const __be32 *a1 = addr1->s6_addr32;
const __be32 *a2 = addr2->s6_addr32;
unsigned int pdw, pbi;
/* check complete u32 in prefix */
pdw = prefixlen >> 5;
if (pdw && memcmp(a1, a2, pdw << 2))
return false;
/* check incomplete u32 in prefix */
pbi = prefixlen & 0x1f;
if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
return false;
return true;
}
#endif
struct inet_frag_queue;
enum ip6_defrag_users {
IP6_DEFRAG_LOCAL_DELIVER,
IP6_DEFRAG_CONNTRACK_IN,
__IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
IP6_DEFRAG_CONNTRACK_OUT,
__IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
__IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
};
struct ip6_create_arg {
__be32 id;
u32 user;
const struct in6_addr *src;
const struct in6_addr *dst;
};
void ip6_frag_init(struct inet_frag_queue *q, void *a);
bool ip6_frag_match(struct inet_frag_queue *q, void *a);
/*
* Equivalent of ipv4 struct ip
*/
struct frag_queue {
struct inet_frag_queue q;
__be32 id; /* fragment id */
u32 user;
struct in6_addr saddr;
struct in6_addr daddr;
int iif;
unsigned int csum;
__u16 nhoffset;
};
void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq,
struct inet_frags *frags);
static inline bool ipv6_addr_any(const struct in6_addr *a)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul = (const unsigned long *)a;
return (ul[0] | ul[1]) == 0UL;
#else
return (a->s6_addr32[0] | a->s6_addr32[1] |
a->s6_addr32[2] | a->s6_addr32[3]) == 0;
#endif
}
static inline u32 ipv6_addr_hash(const struct in6_addr *a)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul = (const unsigned long *)a;
unsigned long x = ul[0] ^ ul[1];
return (u32)(x ^ (x >> 32));
#else
return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^
a->s6_addr32[2] ^ a->s6_addr32[3]);
#endif
}
/* more secured version of ipv6_addr_hash() */
static inline u32 ipv6_addr_jhash(const struct in6_addr *a)
{
u32 v = (__force u32)a->s6_addr32[0] ^ (__force u32)a->s6_addr32[1];
return jhash_3words(v,
(__force u32)a->s6_addr32[2],
(__force u32)a->s6_addr32[3],
ipv6_hash_secret);
}
static inline bool ipv6_addr_loopback(const struct in6_addr *a)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
const unsigned long *ul = (const unsigned long *)a;
return (ul[0] | (ul[1] ^ cpu_to_be64(1))) == 0UL;
#else
return (a->s6_addr32[0] | a->s6_addr32[1] |
a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0;
#endif
}
static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
{
return (
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
*(__be64 *)a |
#else
(a->s6_addr32[0] | a->s6_addr32[1]) |
#endif
(a->s6_addr32[2] ^ htonl(0x0000ffff))) == 0UL;
}
/*
* Check for a RFC 4843 ORCHID address
* (Overlay Routable Cryptographic Hash Identifiers)
*/
static inline bool ipv6_addr_orchid(const struct in6_addr *a)
{
return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
}
static inline void ipv6_addr_set_v4mapped(const __be32 addr,
struct in6_addr *v4mapped)
{
ipv6_addr_set(v4mapped,
0, 0,
htonl(0x0000FFFF),
addr);
}
/*
* find the first different bit between two addresses
* length of address must be a multiple of 32bits
*/
static inline int __ipv6_addr_diff32(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 + 31 - __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;
}
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
static inline int __ipv6_addr_diff64(const void *token1, const void *token2, int addrlen)
{
const __be64 *a1 = token1, *a2 = token2;
int i;
addrlen >>= 3;
for (i = 0; i < addrlen; i++) {
__be64 xb = a1[i] ^ a2[i];
if (xb)
return i * 64 + 63 - __fls(be64_to_cpu(xb));
}
return addrlen << 6;
}
#endif
static inline int __ipv6_addr_diff(const void *token1, const void *token2, int addrlen)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
if (__builtin_constant_p(addrlen) && !(addrlen & 7))
return __ipv6_addr_diff64(token1, token2, addrlen);
#endif
return __ipv6_addr_diff32(token1, token2, addrlen);
}
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));
}
extern void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
/*
* Header manipulation
*/
static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
__be32 flowlabel)
{
*(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
}
static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
{
return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
}
/*
* 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 flowi6 *fl6,
struct ipv6_txoptions *opt,
int tclass);
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 flowi6 *fl6,
struct rt6_info *rt,
unsigned int flags,
int dontfrag);
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 flowi6 *fl6);
extern struct dst_entry * ip6_dst_lookup_flow(struct sock *sk,
struct flowi6 *fl6,
const struct in6_addr *final_dst,
bool can_sleep);
extern struct dst_entry * ip6_sk_dst_lookup_flow(struct sock *sk,
struct flowi6 *fl6,
const struct in6_addr *final_dst,
bool can_sleep);
extern struct dst_entry * ip6_blackhole_route(struct net *net,
struct dst_entry *orig_dst);
/*
* 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);
extern int __ip6_local_out(struct sk_buff *skb);
extern int ip6_local_out(struct sk_buff *skb);
/*
* Extension header (options) processing
*/
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, __be16 *frag_offp);
extern bool ipv6_ext_hdr(u8 nexthdr);
enum {
IP6_FH_F_FRAG = (1 << 0),
IP6_FH_F_AUTH = (1 << 1),
IP6_FH_F_SKIP_RH = (1 << 2),
};
/* find specified header and get offset to it */
extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
int target, unsigned short *fragoff, int *fragflg);
extern int ipv6_find_tlv(struct sk_buff *skb, int offset, int type);
extern struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
const struct ipv6_txoptions *opt,
struct in6_addr *orig);
/*
* socket options (ipv6_sockglue.c)
*/
extern int ipv6_setsockopt(struct sock *sk, int level,
int optname,
char __user *optval,
unsigned 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,
unsigned int optlen);
extern int compat_ipv6_getsockopt(struct sock *sk,
int level,
int optname,
char __user *optval,
int __user *optlen);
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 int ipv6_recv_rxpmtu(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 flowi6 *fl6, u32 info);
extern void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);
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 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);
extern unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr,
const struct in6_addr *daddr, u32 rnd);
#ifdef CONFIG_PROC_FS
extern int ac6_proc_init(struct net *net);
extern void ac6_proc_exit(struct net *net);
extern int raw6_proc_init(void);
extern void raw6_proc_exit(void);
extern int tcp6_proc_init(struct net *net);
extern void tcp6_proc_exit(struct net *net);
extern int udp6_proc_init(struct net *net);
extern void udp6_proc_exit(struct net *net);
[NET]: Supporting UDP-Lite (RFC 3828) in Linux This is a revision of the previously submitted patch, which alters the way files are organized and compiled in the following manner: * UDP and UDP-Lite now use separate object files * source file dependencies resolved via header files net/ipv{4,6}/udp_impl.h * order of inclusion files in udp.c/udplite.c adapted accordingly [NET/IPv4]: Support for the UDP-Lite protocol (RFC 3828) This patch adds support for UDP-Lite to the IPv4 stack, provided as an extension to the existing UDPv4 code: * generic routines are all located in net/ipv4/udp.c * UDP-Lite specific routines are in net/ipv4/udplite.c * MIB/statistics support in /proc/net/snmp and /proc/net/udplite * shared API with extensions for partial checksum coverage [NET/IPv6]: Extension for UDP-Lite over IPv6 It extends the existing UDPv6 code base with support for UDP-Lite in the same manner as per UDPv4. In particular, * UDPv6 generic and shared code is in net/ipv6/udp.c * UDP-Litev6 specific extensions are in net/ipv6/udplite.c * MIB/statistics support in /proc/net/snmp6 and /proc/net/udplite6 * support for IPV6_ADDRFORM * aligned the coding style of protocol initialisation with af_inet6.c * made the error handling in udpv6_queue_rcv_skb consistent; to return `-1' on error on all error cases * consolidation of shared code [NET]: UDP-Lite Documentation and basic XFRM/Netfilter support The UDP-Lite patch further provides * API documentation for UDP-Lite * basic xfrm support * basic netfilter support for IPv4 and IPv6 (LOG target) Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-11-27 19:10:57 +00:00
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);
#else
static inline int ac6_proc_init(struct net *net) { return 0; }
static inline void ac6_proc_exit(struct net *net) { }
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_template[];
extern ctl_table ipv6_icmp_table_template[];
extern struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
extern struct ctl_table *ipv6_route_sysctl_init(struct net *net);
extern int ipv6_sysctl_register(void);
extern void ipv6_sysctl_unregister(void);
#endif
#endif /* _NET_IPV6_H */