ipv6.h 33.6 KB
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
 *	Linux INET6 implementation
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>
 */

#ifndef _NET_IPV6_H
#define _NET_IPV6_H

#include <linux/ipv6.h>
#include <linux/hardirq.h>
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#include <linux/jhash.h>
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#include <linux/refcount.h>
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#include <linux/jump_label_ratelimit.h>
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#include <net/if_inet6.h>
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#include <net/ndisc.h>
#include <net/flow.h>
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#include <net/flow_dissector.h>
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#include <net/snmp.h>
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#include <net/netns/hash.h>
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#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. */
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#define NEXTHDR_GRE		47	/* GRE header. */
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#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. */
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#define NEXTHDR_SCTP		132	/* SCTP message. */
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#define NEXTHDR_MOBILITY	135	/* Mobility header. */
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#define NEXTHDR_MAX		255

#define IPV6_DEFAULT_HOPLIMIT   64
#define IPV6_DEFAULT_MCASTHOPS	1

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/* Limits on Hop-by-Hop and Destination options.
 *
 * Per RFC8200 there is no limit on the maximum number or lengths of options in
 * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
 * We allow configurable limits in order to mitigate potential denial of
 * service attacks.
 *
 * There are three limits that may be set:
 *   - Limit the number of options in a Hop-by-Hop or Destination options
 *     extension header
 *   - Limit the byte length of a Hop-by-Hop or Destination options extension
 *     header
 *   - Disallow unknown options
 *
 * The limits are expressed in corresponding sysctls:
 *
 * ipv6.sysctl.max_dst_opts_cnt
 * ipv6.sysctl.max_hbh_opts_cnt
 * ipv6.sysctl.max_dst_opts_len
 * ipv6.sysctl.max_hbh_opts_len
 *
 * max_*_opts_cnt is the number of TLVs that are allowed for Destination
 * options or Hop-by-Hop options. If the number is less than zero then unknown
 * TLVs are disallowed and the number of known options that are allowed is the
 * absolute value. Setting the value to INT_MAX indicates no limit.
 *
 * max_*_opts_len is the length limit in bytes of a Destination or
 * Hop-by-Hop options extension header. Setting the value to INT_MAX
 * indicates no length limit.
 *
 * If a limit is exceeded when processing an extension header the packet is
 * silently discarded.
 */

/* Default limits for Hop-by-Hop and Destination options */
#define IP6_DEFAULT_MAX_DST_OPTS_CNT	 8
#define IP6_DEFAULT_MAX_HBH_OPTS_CNT	 8
#define IP6_DEFAULT_MAX_DST_OPTS_LEN	 INT_MAX /* No limit */
#define IP6_DEFAULT_MAX_HBH_OPTS_LEN	 INT_MAX /* No limit */

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/*
 *	Addr type
 *	
 *	type	-	unicast | multicast
 *	scope	-	local	| site	    | global
 *	v4	-	compat
 *	v4mapped
 *	any
 *	loopback
 */

#define IPV6_ADDR_ANY		0x0000U

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#define IPV6_ADDR_UNICAST	0x0001U
#define IPV6_ADDR_MULTICAST	0x0002U
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#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

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/*
 *	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)

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/*
 *	fragmentation header
 */

struct frag_hdr {
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	__u8	nexthdr;
	__u8	reserved;
	__be16	frag_off;
	__be32	identification;
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};

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#define	IP6_MF		0x0001
#define	IP6_OFFSET	0xFFF8
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struct ip6_fraglist_iter {
	struct ipv6hdr	*tmp_hdr;
	struct sk_buff	*frag;
	int		offset;
	unsigned int	hlen;
	__be32		frag_id;
	u8		nexthdr;
};

int ip6_fraglist_init(struct sk_buff *skb, unsigned int hlen, u8 *prevhdr,
		      u8 nexthdr, __be32 frag_id,
		      struct ip6_fraglist_iter *iter);
void ip6_fraglist_prepare(struct sk_buff *skb, struct ip6_fraglist_iter *iter);

static inline struct sk_buff *ip6_fraglist_next(struct ip6_fraglist_iter *iter)
{
	struct sk_buff *skb = iter->frag;

	iter->frag = skb->next;
	skb_mark_not_on_list(skb);

	return skb;
}

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struct ip6_frag_state {
	u8		*prevhdr;
	unsigned int	hlen;
	unsigned int	mtu;
	unsigned int	left;
	int		offset;
	int		ptr;
	int		hroom;
	int		troom;
	__be32		frag_id;
	u8		nexthdr;
};

void ip6_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int mtu,
		   unsigned short needed_tailroom, int hdr_room, u8 *prevhdr,
		   u8 nexthdr, __be32 frag_id, struct ip6_frag_state *state);
struct sk_buff *ip6_frag_next(struct sk_buff *skb,
			      struct ip6_frag_state *state);

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#define IP6_REPLY_MARK(net, mark) \
	((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)

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#include <net/sock.h>

/* sysctls */
extern int sysctl_mld_max_msf;
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extern int sysctl_mld_qrv;
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#define _DEVINC(net, statname, mod, idev, field)			\
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({									\
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	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
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		mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
	mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
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})
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/* per device counters are atomic_long_t */
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#define _DEVINCATOMIC(net, statname, mod, idev, field)			\
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({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
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	mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
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})

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/* 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));\
})

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#define _DEVADD(net, statname, mod, idev, field, val)			\
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({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
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		mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
	mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
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})

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#define _DEVUPD(net, statname, mod, idev, field, val)			\
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({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
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		mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
	mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
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})

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/* MIBs */

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#define IP6_INC_STATS(net, idev,field)		\
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		_DEVINC(net, ipv6, , idev, field)
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#define __IP6_INC_STATS(net, idev,field)	\
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		_DEVINC(net, ipv6, __, idev, field)
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#define IP6_ADD_STATS(net, idev,field,val)	\
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		_DEVADD(net, ipv6, , idev, field, val)
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#define __IP6_ADD_STATS(net, idev,field,val)	\
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		_DEVADD(net, ipv6, __, idev, field, val)
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#define IP6_UPD_PO_STATS(net, idev,field,val)   \
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		_DEVUPD(net, ipv6, , idev, field, val)
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#define __IP6_UPD_PO_STATS(net, idev,field,val)   \
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		_DEVUPD(net, ipv6, __, idev, field, val)
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#define ICMP6_INC_STATS(net, idev, field)	\
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		_DEVINCATOMIC(net, icmpv6, , idev, field)
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#define __ICMP6_INC_STATS(net, idev, field)	\
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		_DEVINCATOMIC(net, icmpv6, __, idev, field)
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#define ICMP6MSGOUT_INC_STATS(net, idev, field)		\
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	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
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#define ICMP6MSGIN_INC_STATS(net, idev, field)	\
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	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field)
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struct ip6_ra_chain {
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	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.
 */

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struct ipv6_txoptions {
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	refcount_t		refcnt;
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	/* 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;
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	struct rcu_head		rcu;
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	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
};

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/* flowlabel_reflect sysctl values */
enum flowlabel_reflect {
	FLOWLABEL_REFLECT_ESTABLISHED		= 1,
	FLOWLABEL_REFLECT_TCP_RESET		= 2,
	FLOWLABEL_REFLECT_ICMPV6_ECHO_REPLIES	= 4,
};

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struct ip6_flowlabel {
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	struct ip6_flowlabel __rcu *next;
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	__be32			label;
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	atomic_t		users;
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	struct in6_addr		dst;
	struct ipv6_txoptions	*opt;
	unsigned long		linger;
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	struct rcu_head		rcu;
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	u8			share;
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	union {
		struct pid *pid;
		kuid_t uid;
	} owner;
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	unsigned long		lastuse;
	unsigned long		expires;
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	struct net		*fl_net;
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};

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#define IPV6_FLOWINFO_MASK		cpu_to_be32(0x0FFFFFFF)
#define IPV6_FLOWLABEL_MASK		cpu_to_be32(0x000FFFFF)
#define IPV6_FLOWLABEL_STATELESS_FLAG	cpu_to_be32(0x00080000)

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#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
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#define IPV6_TCLASS_SHIFT	20
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struct ipv6_fl_socklist {
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	struct ipv6_fl_socklist	__rcu	*next;
	struct ip6_flowlabel		*fl;
	struct rcu_head			rcu;
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};

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struct ipcm6_cookie {
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	struct sockcm_cookie sockc;
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	__s16 hlimit;
	__s16 tclass;
	__s8  dontfrag;
	struct ipv6_txoptions *opt;
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	__u16 gso_size;
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};

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static inline void ipcm6_init(struct ipcm6_cookie *ipc6)
{
	*ipc6 = (struct ipcm6_cookie) {
		.hlimit = -1,
		.tclass = -1,
		.dontfrag = -1,
	};
}

static inline void ipcm6_init_sk(struct ipcm6_cookie *ipc6,
				 const struct ipv6_pinfo *np)
{
	*ipc6 = (struct ipcm6_cookie) {
		.hlimit = -1,
		.tclass = np->tclass,
		.dontfrag = np->dontfrag,
	};
}

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static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np)
{
	struct ipv6_txoptions *opt;

	rcu_read_lock();
	opt = rcu_dereference(np->opt);
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	if (opt) {
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		if (!refcount_inc_not_zero(&opt->refcnt))
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			opt = NULL;
		else
			opt = rcu_pointer_handoff(opt);
	}
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	rcu_read_unlock();
	return opt;
}

static inline void txopt_put(struct ipv6_txoptions *opt)
{
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	if (opt && refcount_dec_and_test(&opt->refcnt))
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		kfree_rcu(opt, rcu);
}

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struct ip6_flowlabel *__fl6_sock_lookup(struct sock *sk, __be32 label);

extern struct static_key_false_deferred ipv6_flowlabel_exclusive;
static inline struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk,
						    __be32 label)
{
	if (static_branch_unlikely(&ipv6_flowlabel_exclusive.key))
		return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);

	return NULL;
}

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struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
					 struct ip6_flowlabel *fl,
					 struct ipv6_txoptions *fopt);
void fl6_free_socklist(struct sock *sk);
int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen);
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int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
			   int flags);
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int ip6_flowlabel_init(void);
void ip6_flowlabel_cleanup(void);
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bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);
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static inline void fl6_sock_release(struct ip6_flowlabel *fl)
{
	if (fl)
		atomic_dec(&fl->users);
}

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void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);
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void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
				struct icmp6hdr *thdr, int len);
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int ip6_ra_control(struct sock *sk, int sel);
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int ipv6_parse_hopopts(struct sk_buff *skb);
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struct ipv6_txoptions *ipv6_dup_options(struct sock *sk,
					struct ipv6_txoptions *opt);
struct ipv6_txoptions *ipv6_renew_options(struct sock *sk,
					  struct ipv6_txoptions *opt,
					  int newtype,
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					  struct ipv6_opt_hdr *newopt);
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struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
					  struct ipv6_txoptions *opt);
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bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
		       const struct inet6_skb_parm *opt);
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struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
					   struct ipv6_txoptions *opt);
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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;
}

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#define IPV6_FRAG_HIGH_THRESH	(4 * 1024*1024)	/* 4194304 */
#define IPV6_FRAG_LOW_THRESH	(3 * 1024*1024)	/* 3145728 */
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#define IPV6_FRAG_TIMEOUT	(60 * HZ)	/* 60 seconds */
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int __ipv6_addr_type(const struct in6_addr *addr);
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static inline int ipv6_addr_type(const struct in6_addr *addr)
{
	return __ipv6_addr_type(addr) & 0xffff;
}
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static inline int ipv6_addr_scope(const struct in6_addr *addr)
{
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	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
}

static inline int __ipv6_addr_src_scope(int type)
{
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	return (type == IPV6_ADDR_ANY) ? __IPV6_ADDR_SCOPE_INVALID : (type >> 16);
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}

static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
{
	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
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}

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static inline bool __ipv6_addr_needs_scope_id(int type)
{
	return type & IPV6_ADDR_LINKLOCAL ||
	       (type & IPV6_ADDR_MULTICAST &&
		(type & (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)));
}

static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
{
	return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
}

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static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
{
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	return memcmp(a1, a2, sizeof(struct in6_addr));
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}

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static inline bool
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ipv6_masked_addr_cmp(const struct in6_addr *a1, const struct in6_addr *m,
		     const struct in6_addr *a2)
{
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#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
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	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]));
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#endif
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}

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static inline void ipv6_addr_prefix(struct in6_addr *pfx,
L
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				    const struct in6_addr *addr,
				    int plen)
{
	/* caller must guarantee 0 <= plen <= 128 */
	int o = plen >> 3,
	    b = plen & 0x7;

523
	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));
L
Linus Torvalds 已提交
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	memcpy(pfx->s6_addr, addr, o);
525
	if (b != 0)
L
Linus Torvalds 已提交
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		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);
}

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static inline void ipv6_addr_prefix_copy(struct in6_addr *addr,
					 const struct in6_addr *pfx,
					 int plen)
{
	/* caller must guarantee 0 <= plen <= 128 */
	int o = plen >> 3,
	    b = plen & 0x7;

	memcpy(addr->s6_addr, pfx, o);
	if (b != 0) {
		addr->s6_addr[o] &= ~(0xff00 >> b);
		addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));
	}
}

544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
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;
}

S
Stephen Hemminger 已提交
564
static inline void ipv6_addr_set(struct in6_addr *addr,
A
Al Viro 已提交
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				     __be32 w1, __be32 w2,
				     __be32 w3, __be32 w4)
L
Linus Torvalds 已提交
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{
568 569
	__ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);
	__ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);
L
Linus Torvalds 已提交
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}

E
Eric Dumazet 已提交
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static inline bool ipv6_addr_equal(const struct in6_addr *a1,
				   const struct in6_addr *a2)
L
Linus Torvalds 已提交
574
{
575 576 577 578 579 580
#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
E
Eric Dumazet 已提交
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	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;
585
#endif
L
Linus Torvalds 已提交
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}

588 589 590 591 592
#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)
{
593
	if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))
594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612
		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
613 614 615
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
				     const struct in6_addr *addr2,
				     unsigned int prefixlen)
L
Linus Torvalds 已提交
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{
617 618
	const __be32 *a1 = addr1->s6_addr32;
	const __be32 *a2 = addr2->s6_addr32;
619
	unsigned int pdw, pbi;
L
Linus Torvalds 已提交
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	/* check complete u32 in prefix */
	pdw = prefixlen >> 5;
	if (pdw && memcmp(a1, a2, pdw << 2))
E
Eric Dumazet 已提交
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		return false;
L
Linus Torvalds 已提交
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	/* check incomplete u32 in prefix */
	pbi = prefixlen & 0x1f;
	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))
E
Eric Dumazet 已提交
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		return false;
L
Linus Torvalds 已提交
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E
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	return true;
L
Linus Torvalds 已提交
632
}
633
#endif
L
Linus Torvalds 已提交
634

E
Eric Dumazet 已提交
635
static inline bool ipv6_addr_any(const struct in6_addr *a)
L
Linus Torvalds 已提交
636
{
637 638 639 640 641
#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
E
Eric Dumazet 已提交
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	return (a->s6_addr32[0] | a->s6_addr32[1] |
		a->s6_addr32[2] | a->s6_addr32[3]) == 0;
644
#endif
L
Linus Torvalds 已提交
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}

E
Eric Dumazet 已提交
647 648 649 650 651 652 653 654 655 656 657 658 659
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
}

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Eric Dumazet 已提交
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/* more secured version of ipv6_addr_hash() */
661
static inline u32 __ipv6_addr_jhash(const struct in6_addr *a, const u32 initval)
E
Eric Dumazet 已提交
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{
	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],
668
			    initval);
E
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}

E
Eric Dumazet 已提交
671
static inline bool ipv6_addr_loopback(const struct in6_addr *a)
672
{
673
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
674
	const __be64 *be = (const __be64 *)a;
675

676
	return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
677
#else
E
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	return (a->s6_addr32[0] | a->s6_addr32[1] |
679
		a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
680
#endif
681 682
}

683 684 685 686
/*
 * Note that we must __force cast these to unsigned long to make sparse happy,
 * since all of the endian-annotated types are fixed size regardless of arch.
 */
E
Eric Dumazet 已提交
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static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
B
Brian Haley 已提交
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{
689 690
	return (
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
691
		*(unsigned long *)a |
692
#else
693
		(__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
694
#endif
695 696
		(__force unsigned long)(a->s6_addr32[2] ^
					cpu_to_be32(0x0000ffff))) == 0UL;
B
Brian Haley 已提交
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}

699 700 701 702 703
static inline bool ipv6_addr_v4mapped_loopback(const struct in6_addr *a)
{
	return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);
}

704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719
static inline u32 ipv6_portaddr_hash(const struct net *net,
				     const struct in6_addr *addr6,
				     unsigned int port)
{
	unsigned int hash, mix = net_hash_mix(net);

	if (ipv6_addr_any(addr6))
		hash = jhash_1word(0, mix);
	else if (ipv6_addr_v4mapped(addr6))
		hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
	else
		hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);

	return hash ^ port;
}

720 721 722 723
/*
 * Check for a RFC 4843 ORCHID address
 * (Overlay Routable Cryptographic Hash Identifiers)
 */
E
Eric Dumazet 已提交
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static inline bool ipv6_addr_orchid(const struct in6_addr *a)
725
{
E
Eric Dumazet 已提交
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	return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
727 728
}

729 730 731 732 733
static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
{
	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
}

734 735 736 737 738 739 740 741 742
static inline void ipv6_addr_set_v4mapped(const __be32 addr,
					  struct in6_addr *v4mapped)
{
	ipv6_addr_set(v4mapped,
			0, 0,
			htonl(0x0000FFFF),
			addr);
}

743 744 745 746
/*
 * find the first different bit between two addresses
 * length of address must be a multiple of 32bits
 */
747
static inline int __ipv6_addr_diff32(const void *token1, const void *token2, int addrlen)
748
{
749
	const __be32 *a1 = token1, *a2 = token2;
750 751 752 753 754
	int i;

	addrlen >>= 2;

	for (i = 0; i < addrlen; i++) {
755 756
		__be32 xb = a1[i] ^ a2[i];
		if (xb)
757
			return i * 32 + 31 - __fls(ntohl(xb));
758 759 760
	}

	/*
S
Stephen Hemminger 已提交
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	 *	we should *never* get to this point since that
762 763 764 765 766 767 768 769 770 771 772 773 774 775
	 *	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)
	 */
E
Eric Dumazet 已提交
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	return addrlen << 5;
777 778
}

779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
#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);
}

806 807 808 809 810
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));
}

811 812 813
__be32 ipv6_select_ident(struct net *net,
			 const struct in6_addr *daddr,
			 const struct in6_addr *saddr);
814
__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
815

816
int ip6_dst_hoplimit(struct dst_entry *dst);
817

818 819 820 821 822 823 824 825 826 827 828 829 830 831
static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
				      struct dst_entry *dst)
{
	int hlimit;

	if (ipv6_addr_is_multicast(&fl6->daddr))
		hlimit = np->mcast_hops;
	else
		hlimit = np->hop_limit;
	if (hlimit < 0)
		hlimit = ip6_dst_hoplimit(dst);
	return hlimit;
}

832 833 834 835 836 837 838 839 840 841 842 843 844 845
/* copy IPv6 saddr & daddr to flow_keys, possibly using 64bit load/store
 * Equivalent to :	flow->v6addrs.src = iph->saddr;
 *			flow->v6addrs.dst = iph->daddr;
 */
static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow,
					    const struct ipv6hdr *iph)
{
	BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=
		     offsetof(typeof(flow->addrs), v6addrs.src) +
		     sizeof(flow->addrs.v6addrs.src));
	memcpy(&flow->addrs.v6addrs, &iph->saddr, sizeof(flow->addrs.v6addrs));
	flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
}

846
#if IS_ENABLED(CONFIG_IPV6)
847

848 849 850 851 852 853 854
static inline bool ipv6_can_nonlocal_bind(struct net *net,
					  struct inet_sock *inet)
{
	return net->ipv6.sysctl.ip_nonlocal_bind ||
		inet->freebind || inet->transparent;
}

855 856 857 858 859 860 861 862
/* Sysctl settings for net ipv6.auto_flowlabels */
#define IP6_AUTO_FLOW_LABEL_OFF		0
#define IP6_AUTO_FLOW_LABEL_OPTOUT	1
#define IP6_AUTO_FLOW_LABEL_OPTIN	2
#define IP6_AUTO_FLOW_LABEL_FORCED	3

#define IP6_AUTO_FLOW_LABEL_MAX		IP6_AUTO_FLOW_LABEL_FORCED

863
#define IP6_DEFAULT_AUTO_FLOW_LABELS	IP6_AUTO_FLOW_LABEL_OPTOUT
864

865
static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
866 867
					__be32 flowlabel, bool autolabel,
					struct flowi6 *fl6)
868
{
869
	u32 hash;
870

871 872 873 874 875
	/* @flowlabel may include more than a flow label, eg, the traffic class.
	 * Here we want only the flow label value.
	 */
	flowlabel &= IPV6_FLOWLABEL_MASK;

876 877 878 879 880
	if (flowlabel ||
	    net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||
	    (!autolabel &&
	     net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))
		return flowlabel;
881

882
	hash = skb_get_hash_flowi6(skb, fl6);
883

884 885 886 887
	/* Since this is being sent on the wire obfuscate hash a bit
	 * to minimize possbility that any useful information to an
	 * attacker is leaked. Only lower 20 bits are relevant.
	 */
888
	hash = rol32(hash, 16);
T
Tom Herbert 已提交
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890 891 892 893
	flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;

	if (net->ipv6.sysctl.flowlabel_state_ranges)
		flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG;
894 895 896

	return flowlabel;
}
897 898 899 900 901 902 903 904 905 906 907 908 909

static inline int ip6_default_np_autolabel(struct net *net)
{
	switch (net->ipv6.sysctl.auto_flowlabels) {
	case IP6_AUTO_FLOW_LABEL_OFF:
	case IP6_AUTO_FLOW_LABEL_OPTIN:
	default:
		return 0;
	case IP6_AUTO_FLOW_LABEL_OPTOUT:
	case IP6_AUTO_FLOW_LABEL_FORCED:
		return 1;
	}
}
910 911
#else
static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
912 913
					__be32 flowlabel, bool autolabel,
					struct flowi6 *fl6)
914 915 916
{
	return flowlabel;
}
917 918 919 920
static inline int ip6_default_np_autolabel(struct net *net)
{
	return 0;
}
921 922
#endif

923 924 925 926 927 928 929 930 931 932 933
#if IS_ENABLED(CONFIG_IPV6)
static inline int ip6_multipath_hash_policy(const struct net *net)
{
	return net->ipv6.sysctl.multipath_hash_policy;
}
#else
static inline int ip6_multipath_hash_policy(const struct net *net)
{
	return 0;
}
#endif
934

935 936 937 938 939 940
/*
 *	Header manipulation
 */
static inline void ip6_flow_hdr(struct ipv6hdr *hdr, unsigned int tclass,
				__be32 flowlabel)
{
941
	*(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | flowlabel;
942 943
}

944 945 946 947 948
static inline __be32 ip6_flowinfo(const struct ipv6hdr *hdr)
{
	return *(__be32 *)hdr & IPV6_FLOWINFO_MASK;
}

F
Florent Fourcot 已提交
949 950 951 952 953
static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
{
	return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
}

954 955 956 957
static inline u8 ip6_tclass(__be32 flowinfo)
{
	return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
}
958 959 960 961 962 963

static inline __be32 ip6_make_flowinfo(unsigned int tclass, __be32 flowlabel)
{
	return htonl(tclass << IPV6_TCLASS_SHIFT) | flowlabel;
}

964 965 966 967 968
static inline __be32 flowi6_get_flowlabel(const struct flowi6 *fl6)
{
	return fl6->flowlabel & IPV6_FLOWLABEL_MASK;
}

L
Linus Torvalds 已提交
969 970 971 972 973 974 975 976
/*
 *	Prototypes exported by ipv6
 */

/*
 *	rcv function (called from netdevice level)
 */

977 978
int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
	     struct packet_type *pt, struct net_device *orig_dev);
979 980
void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
		   struct net_device *orig_dev);
L
Linus Torvalds 已提交
981

982
int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
983

L
Linus Torvalds 已提交
984 985 986
/*
 *	upper-layer output functions
 */
987
int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
988
	     __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
989 990 991 992 993 994

int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr);

int ip6_append_data(struct sock *sk,
		    int getfrag(void *from, char *to, int offset, int len,
				int odd, struct sk_buff *skb),
W
Wei Wang 已提交
995 996
		    void *from, int length, int transhdrlen,
		    struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
997
		    struct rt6_info *rt, unsigned int flags);
998 999 1000 1001 1002

int ip6_push_pending_frames(struct sock *sk);

void ip6_flush_pending_frames(struct sock *sk);

V
Vlad Yasevich 已提交
1003 1004 1005 1006 1007 1008 1009 1010 1011
int ip6_send_skb(struct sk_buff *skb);

struct sk_buff *__ip6_make_skb(struct sock *sk, struct sk_buff_head *queue,
			       struct inet_cork_full *cork,
			       struct inet6_cork *v6_cork);
struct sk_buff *ip6_make_skb(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,
W
Wei Wang 已提交
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			     struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
			     struct rt6_info *rt, unsigned int flags,
1014
			     struct inet_cork_full *cork);
V
Vlad Yasevich 已提交
1015 1016 1017 1018 1019 1020 1021

static inline struct sk_buff *ip6_finish_skb(struct sock *sk)
{
	return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,
			      &inet6_sk(sk)->cork);
}

1022 1023
int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
		   struct flowi6 *fl6);
1024
struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
1025
				      const struct in6_addr *final_dst);
1026
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
1027 1028
					 const struct in6_addr *final_dst,
					 bool connected);
1029 1030 1031 1032 1033 1034
struct dst_entry *ip6_dst_lookup_tunnel(struct sk_buff *skb,
					struct net_device *dev,
					struct net *net, struct socket *sock,
					struct in6_addr *saddr,
					const struct ip_tunnel_info *info,
					u8 protocol, bool use_cache);
1035 1036
struct dst_entry *ip6_blackhole_route(struct net *net,
				      struct dst_entry *orig_dst);
L
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/*
 *	skb processing functions
 */

E
Eric W. Biederman 已提交
1042
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
1043 1044 1045
int ip6_forward(struct sk_buff *skb);
int ip6_input(struct sk_buff *skb);
int ip6_mc_input(struct sk_buff *skb);
1046 1047
void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
			      bool have_final);
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1049
int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
1050
int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
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L
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/*
 *	Extension header (options) processing
 */

1056
void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
1057 1058
			  u8 *proto, struct in6_addr **daddr_p,
			  struct in6_addr *saddr);
1059 1060
void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
			 u8 *proto);
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1062 1063
int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
		     __be16 *frag_offp);
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1065
bool ipv6_ext_hdr(u8 nexthdr);
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1067
enum {
1068 1069 1070
	IP6_FH_F_FRAG		= (1 << 0),
	IP6_FH_F_AUTH		= (1 << 1),
	IP6_FH_F_SKIP_RH	= (1 << 2),
1071 1072 1073
};

/* find specified header and get offset to it */
1074 1075
int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
		  unsigned short *fragoff, int *fragflg);
1076

1077
int ipv6_find_tlv(const struct sk_buff *skb, int offset, int type);
1078

1079 1080 1081
struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
				const struct ipv6_txoptions *opt,
				struct in6_addr *orig);
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L
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/*
 *	socket options (ipv6_sockglue.c)
 */

1087 1088 1089 1090 1091 1092 1093 1094 1095
int ipv6_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, unsigned int optlen);
int ipv6_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen);
int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen);
int compat_ipv6_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen);

1096 1097
int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
			   int addr_len);
1098
int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
1099 1100
int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
				 int addr_len);
1101
int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
1102
void ip6_datagram_release_cb(struct sock *sk);
1103

1104 1105 1106 1107
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
		    int *addr_len);
int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
		     int *addr_len);
1108 1109 1110 1111 1112 1113 1114
void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
		     u32 info, u8 *payload);
void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info);
void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu);

int inet6_release(struct socket *sock);
int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
1115
int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
1116 1117
		  int peer);
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
1118 1119
int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
		unsigned long arg);
1120 1121

int inet6_hash_connect(struct inet_timewait_death_row *death_row,
1122
			      struct sock *sk);
1123 1124 1125
int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size);
int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
		  int flags);
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/*
 * reassembly.c
 */
1130 1131
extern const struct proto_ops inet6_stream_ops;
extern const struct proto_ops inet6_dgram_ops;
1132
extern const struct proto_ops inet6_sockraw_ops;
1133

1134 1135 1136
struct group_source_req;
struct group_filter;

1137 1138
int ip6_mc_source(int add, int omode, struct sock *sk,
		  struct group_source_req *pgsr);
1139 1140
int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
		  struct sockaddr_storage *list);
1141
int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
1142
		  struct sockaddr_storage __user *p);
1143 1144

#ifdef CONFIG_PROC_FS
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
int ac6_proc_init(struct net *net);
void ac6_proc_exit(struct net *net);
int raw6_proc_init(void);
void raw6_proc_exit(void);
int tcp6_proc_init(struct net *net);
void tcp6_proc_exit(struct net *net);
int udp6_proc_init(struct net *net);
void udp6_proc_exit(struct net *net);
int udplite6_proc_init(void);
void udplite6_proc_exit(void);
int ipv6_misc_proc_init(void);
void ipv6_misc_proc_exit(void);
int snmp6_register_dev(struct inet6_dev *idev);
int snmp6_unregister_dev(struct inet6_dev *idev);
1159

1160
#else
1161 1162 1163 1164
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; }
1165
#endif
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1167
#ifdef CONFIG_SYSCTL
1168 1169 1170 1171
struct ctl_table *ipv6_icmp_sysctl_init(struct net *net);
struct ctl_table *ipv6_route_sysctl_init(struct net *net);
int ipv6_sysctl_register(void);
void ipv6_sysctl_unregister(void);
1172
#endif
L
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1173

1174 1175
int ipv6_sock_mc_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
1176 1177
int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
			  const struct in6_addr *addr, unsigned int mode);
1178 1179
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190

static inline int ip6_sock_set_v6only(struct sock *sk)
{
	if (inet_sk(sk)->inet_num)
		return -EINVAL;
	lock_sock(sk);
	sk->sk_ipv6only = true;
	release_sock(sk);
	return 0;
}

1191 1192 1193 1194 1195 1196 1197
static inline void ip6_sock_set_recverr(struct sock *sk)
{
	lock_sock(sk);
	inet6_sk(sk)->recverr = true;
	release_sock(sk);
}

1198
#endif /* _NET_IPV6_H */