FM / net

/usr/src/linux-headers-5.15.0-181/include/net/

/usr/src/linux-headers-5.15.0-181/include/net

Name	Size	Mode	Actions
9p/	-	0755	rm
bluetooth/	-	0755	rm
caif/	-	0755	rm
iucv/	-	0755	rm
netfilter/	-	0755	rm
netns/	-	0755	rm
nfc/	-	0755	rm
phonet/	-	0755	rm
sctp/	-	0755	rm
tc_act/	-	0755	rm
6lowpan.h	10270	0644	edit dl rm
act_api.h	8647	0644	edit dl rm
addrconf.h	14594	0644	edit dl rm
af_ieee802154.h	1220	0644	edit dl rm
af_rxrpc.h	2798	0644	edit dl rm
af_unix.h	3375	0644	edit dl rm
af_vsock.h	7592	0644	edit dl rm
ah.h	382	0644	edit dl rm
arp.h	2141	0644	edit dl rm
atmclip.h	1515	0644	edit dl rm
ax25.h	15443	0644	edit dl rm
ax88796.h	1440	0644	edit dl rm
bareudp.h	572	0644	edit dl rm
bonding.h	20263	0644	edit dl rm
bond_3ad.h	9706	0644	edit dl rm
bond_alb.h	6251	0644	edit dl rm
bond_options.h	3876	0644	edit dl rm
bpf_sk_storage.h	1780	0644	edit dl rm
busy_poll.h	3959	0644	edit dl rm
calipso.h	1590	0644	edit dl rm
cfg80211-wext.h	1854	0644	edit dl rm
cfg80211.h	301317	0644	edit dl rm
cfg802154.h	10779	0644	edit dl rm
checksum.h	4869	0644	edit dl rm
cipso_ipv4.h	7548	0644	edit dl rm
cls_cgroup.h	2086	0644	edit dl rm
codel.h	5782	0644	edit dl rm
codel_impl.h	8167	0644	edit dl rm
codel_qdisc.h	2973	0644	edit dl rm
compat.h	2586	0644	edit dl rm
datalink.h	619	0644	edit dl rm
dcbevent.h	742	0644	edit dl rm
dcbnl.h	4317	0644	edit dl rm
devlink.h	63593	0644	edit dl rm
dsa.h	36231	0644	edit dl rm
dsfield.h	1147	0644	edit dl rm
dst.h	15153	0644	edit dl rm
dst_cache.h	3031	0644	edit dl rm
dst_metadata.h	5521	0644	edit dl rm
dst_ops.h	2125	0644	edit dl rm
erspan.h	9180	0644	edit dl rm
esp.h	1190	0644	edit dl rm
espintcp.h	966	0644	edit dl rm
ethoc.h	391	0644	edit dl rm
failover.h	1178	0644	edit dl rm
fib_notifier.h	1384	0644	edit dl rm
fib_rules.h	6450	0644	edit dl rm
firewire.h	636	0644	edit dl rm
flow.h	5119	0644	edit dl rm
flow_dissector.h	10517	0644	edit dl rm
flow_offload.h	15938	0644	edit dl rm
fou.h	549	0644	edit dl rm
fq.h	2528	0644	edit dl rm
fq_impl.h	8076	0644	edit dl rm
garp.h	2678	0644	edit dl rm
genetlink.h	13854	0644	edit dl rm
geneve.h	1898	0644	edit dl rm
gen_stats.h	2889	0644	edit dl rm
gre.h	3369	0644	edit dl rm
gro.h	783	0644	edit dl rm
gro_cells.h	443	0644	edit dl rm
gtp.h	633	0644	edit dl rm
gue.h	3313	0644	edit dl rm
hwbm.h	969	0644	edit dl rm
icmp.h	1918	0644	edit dl rm
ieee80211_radiotap.h	13518	0644	edit dl rm
ieee802154_netdev.h	10095	0644	edit dl rm
ife.h	1057	0644	edit dl rm
if_inet6.h	6692	0644	edit dl rm
ila.h	291	0644	edit dl rm
inet6_connection_sock.h	765	0644	edit dl rm
inet6_hashtables.h	4259	0644	edit dl rm
inetpeer.h	3372	0644	edit dl rm
inet_common.h	2614	0644	edit dl rm
inet_connection_sock.h	11519	0644	edit dl rm
inet_ecn.h	7625	0644	edit dl rm
inet_frag.h	5046	0644	edit dl rm
inet_hashtables.h	12532	0644	edit dl rm
inet_sock.h	9994	0644	edit dl rm
inet_timewait_sock.h	3735	0644	edit dl rm
ioam6.h	1199	0644	edit dl rm
ip.h	22759	0644	edit dl rm
ip6_checksum.h	2770	0644	edit dl rm
ip6_fib.h	16280	0644	edit dl rm
ip6_route.h	10230	0644	edit dl rm
ip6_tunnel.h	5096	0644	edit dl rm
ipcomp.h	659	0644	edit dl rm
ipconfig.h	811	0644	edit dl rm
ipv6.h	36182	0644	edit dl rm
ipv6_frag.h	3361	0644	edit dl rm
ipv6_stubs.h	3482	0644	edit dl rm
ip_fib.h	16346	0644	edit dl rm
ip_tunnels.h	15949	0644	edit dl rm
ip_vs.h	50588	0644	edit dl rm
iw_handler.h	21413	0644	edit dl rm
kcm.h	4961	0644	edit dl rm
l3mdev.h	7202	0644	edit dl rm
lag.h	409	0644	edit dl rm
lapb.h	4938	0644	edit dl rm
lib80211.h	4017	0644	edit dl rm
llc.h	4514	0644	edit dl rm
llc_conn.h	4155	0644	edit dl rm
llc_c_ac.h	9537	0644	edit dl rm
llc_c_ev.h	10940	0644	edit dl rm
llc_c_st.h	1762	0644	edit dl rm
llc_if.h	2210	0644	edit dl rm
llc_pdu.h	14697	0644	edit dl rm
llc_sap.h	1108	0644	edit dl rm
llc_s_ac.h	1591	0644	edit dl rm
llc_s_ev.h	2255	0644	edit dl rm
llc_s_st.h	947	0644	edit dl rm
lwtunnel.h	6806	0644	edit dl rm
mac80211.h	273972	0644	edit dl rm
mac802154.h	15235	0644	edit dl rm
macsec.h	7084	0644	edit dl rm
mctp.h	6155	0644	edit dl rm
mctpdevice.h	841	0644	edit dl rm
mip6.h	1016	0644	edit dl rm
mld.h	2918	0644	edit dl rm
mpls.h	943	0644	edit dl rm
mpls_iptunnel.h	429	0644	edit dl rm
mptcp.h	6776	0644	edit dl rm
mrp.h	3119	0644	edit dl rm
ncsi.h	1964	0644	edit dl rm
ndisc.h	15150	0644	edit dl rm
neighbour.h	16099	0644	edit dl rm
netevent.h	1044	0644	edit dl rm
netlabel.h	20676	0644	edit dl rm
netlink.h	61656	0644	edit dl rm
netprio_cgroup.h	1047	0644	edit dl rm
netrom.h	7895	0644	edit dl rm
net_failover.h	1023	0644	edit dl rm
net_namespace.h	12795	0644	edit dl rm
net_ratelimit.h	220	0644	edit dl rm
nexthop.h	12565	0644	edit dl rm
nl802154.h	12384	0644	edit dl rm
nsh.h	12602	0644	edit dl rm
p8022.h	447	0644	edit dl rm
page_pool.h	8646	0644	edit dl rm
pie.h	3684	0644	edit dl rm
ping.h	2970	0644	edit dl rm
pkt_cls.h	24431	0644	edit dl rm
pkt_sched.h	6042	0644	edit dl rm
pptp.h	557	0644	edit dl rm
protocol.h	3900	0644	edit dl rm
psample.h	1083	0644	edit dl rm
psnap.h	351	0644	edit dl rm
raw.h	2136	0644	edit dl rm
rawv6.h	854	0644	edit dl rm
red.h	11654	0644	edit dl rm
regulatory.h	10901	0644	edit dl rm
request_sock.h	6660	0644	edit dl rm
rose.h	7802	0644	edit dl rm
route.h	11582	0644	edit dl rm
rpl.h	839	0644	edit dl rm
rsi_91x.h	1710	0644	edit dl rm
rtnetlink.h	7638	0644	edit dl rm
rtnh.h	859	0644	edit dl rm
sch_generic.h	34720	0644	edit dl rm
scm.h	3877	0644	edit dl rm
secure_seq.h	855	0644	edit dl rm
seg6.h	2237	0644	edit dl rm
seg6_hmac.h	1473	0644	edit dl rm
seg6_local.h	644	0644	edit dl rm
selftests.h	582	0644	edit dl rm
slhc_vj.h	6831	0644	edit dl rm
smc.h	2513	0644	edit dl rm
snmp.h	5268	0644	edit dl rm
sock.h	86351	0644	edit dl rm
sock_reuseport.h	1873	0644	edit dl rm
Space.h	737	0644	edit dl rm
stp.h	383	0644	edit dl rm
strparser.h	4250	0644	edit dl rm
switchdev.h	14614	0644	edit dl rm
tcp.h	75246	0644	edit dl rm
tcp_states.h	1225	0644	edit dl rm
timewait_sock.h	925	0644	edit dl rm
tipc.h	2405	0644	edit dl rm
tls.h	21465	0644	edit dl rm
tls_toe.h	3006	0644	edit dl rm
transp_v6.h	1996	0644	edit dl rm
tso.h	566	0644	edit dl rm
tun_proto.h	988	0644	edit dl rm
udp.h	17035	0644	edit dl rm
udplite.h	3762	0644	edit dl rm
udp_tunnel.h	12201	0644	edit dl rm
vsock_addr.h	662	0644	edit dl rm
vxlan.h	14424	0644	edit dl rm
wext.h	1510	0644	edit dl rm
x25.h	9718	0644	edit dl rm
x25device.h	387	0644	edit dl rm
xdp.h	8829	0644	edit dl rm
xdp_priv.h	446	0644	edit dl rm
xdp_sock.h	2094	0644	edit dl rm
xdp_sock_drv.h	5607	0644	edit dl rm
xfrm.h	56304	0644	edit dl rm
xsk_buff_pool.h	5138	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-181/include/net/ipv6.h (36182B)

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *	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>
#include <linux/jhash.h>
#include <linux/refcount.h>
#include <linux/jump_label_ratelimit.h>
#include <net/if_inet6.h>
#include <net/ndisc.h>
#include <net/flow.h>
#include <net/flow_dissector.h>
#include <net/snmp.h>
#include <net/netns/hash.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_IPV4		4	/* IPv4 in IPv6 */
#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_SCTP		132	/* SCTP message. */
#define NEXTHDR_MOBILITY	135	/* Mobility header. */

#define NEXTHDR_MAX		255

#define IPV6_DEFAULT_HOPLIMIT   64
#define IPV6_DEFAULT_MCASTHOPS	1

/* 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 */

/*
 *	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
#define	IP6_OFFSET	0xFFF8

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;
}

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);

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

#include <net/sock.h>

/* sysctls */
extern int sysctl_mld_max_msf;
extern int sysctl_mld_qrv;

#define _DEVINC(net, statname, mod, idev, field)			\
({									\
	struct inet6_dev *_idev = (idev);				\
	if (likely(_idev != NULL))					\
		mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
	mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
})

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

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

/* MIBs */

#define IP6_INC_STATS(net, idev,field)		\
		_DEVINC(net, ipv6, , idev, field)
#define __IP6_INC_STATS(net, idev,field)	\
		_DEVINC(net, ipv6, __, idev, field)
#define IP6_ADD_STATS(net, idev,field,val)	\
		_DEVADD(net, ipv6, , idev, field, val)
#define __IP6_ADD_STATS(net, idev,field,val)	\
		_DEVADD(net, ipv6, __, idev, field, val)
#define IP6_UPD_PO_STATS(net, idev,field,val)   \
		_DEVUPD(net, ipv6, , idev, field, val)
#define __IP6_UPD_PO_STATS(net, idev,field,val)   \
		_DEVUPD(net, ipv6, __, idev, field, val)
#define ICMP6_INC_STATS(net, idev, field)	\
		_DEVINCATOMIC(net, icmpv6, , idev, field)
#define __ICMP6_INC_STATS(net, idev, field)	\
		_DEVINCATOMIC(net, icmpv6, __, idev, field)

#define ICMP6MSGOUT_INC_STATS(net, idev, field)		\
	_DEVINC_ATOMIC_ATOMIC(net, icmpv6msg, idev, field +256)
#define ICMP6MSGIN_INC_STATS(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 {
	refcount_t		refcnt;
	/* 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;
	struct rcu_head		rcu;
	/* Option buffer, as read by IPV6_PKTOPTIONS, starts here. */
};

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

struct ip6_flowlabel {
	struct ip6_flowlabel __rcu *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)
#define IPV6_FLOWLABEL_STATELESS_FLAG	cpu_to_be32(0x00080000)

#define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK)
#define IPV6_TCLASS_SHIFT	20

struct ipv6_fl_socklist {
	struct ipv6_fl_socklist	__rcu	*next;
	struct ip6_flowlabel		*fl;
	struct rcu_head			rcu;
};

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

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,
	};
}

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

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

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

#if IS_ENABLED(CONFIG_IPV6)
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) &&
	    READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))
		return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);

return NULL;
}
#endif

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, sockptr_t optval, int optlen);
int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
			   int flags);
int ip6_flowlabel_init(void);
void ip6_flowlabel_cleanup(void);
bool ip6_autoflowlabel(struct net *net, const struct ipv6_pinfo *np);

static inline void fl6_sock_release(struct ip6_flowlabel *fl)
{
	if (fl)
		atomic_dec(&fl->users);
}

void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info);

void icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
				struct icmp6hdr *thdr, int len);

int ip6_ra_control(struct sock *sk, int sel);

int ipv6_parse_hopopts(struct sk_buff *skb);

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,
					  struct ipv6_opt_hdr *newopt);
struct ipv6_txoptions *ipv6_fixup_options(struct ipv6_txoptions *opt_space,
					  struct ipv6_txoptions *opt);

bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
		       const struct inet6_skb_parm *opt);
struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
					   struct ipv6_txoptions *opt);

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;
}

#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 */

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 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;
}

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_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));
	}
}

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

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, const u32 initval)
{
	return jhash2((__force const u32 *)a->s6_addr32,
		      ARRAY_SIZE(a->s6_addr32), initval);
}

static inline bool ipv6_addr_loopback(const struct in6_addr *a)
{
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
	const __be64 *be = (const __be64 *)a;

return (be[0] | (be[1] ^ cpu_to_be64(1))) == 0UL;
#else
	return (a->s6_addr32[0] | a->s6_addr32[1] |
		a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;
#endif
}

/*
 * 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.
 */
static inline bool ipv6_addr_v4mapped(const struct in6_addr *a)
{
	return (
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
		*(unsigned long *)a |
#else
		(__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |
#endif
		(__force unsigned long)(a->s6_addr32[2] ^
					cpu_to_be32(0x0000ffff))) == 0UL;
}

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

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;
}

/*
 * 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 bool ipv6_addr_is_multicast(const struct in6_addr *addr)
{
	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
}

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));
}

__be32 ipv6_select_ident(struct net *net,
			 const struct in6_addr *daddr,
			 const struct in6_addr *saddr);
__be32 ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);

int ip6_dst_hoplimit(struct dst_entry *dst);

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;
}

/* 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->addrs, sizeof(flow->addrs.v6addrs));
	flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
}

#if IS_ENABLED(CONFIG_IPV6)

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;
}

/* 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

#define IP6_DEFAULT_AUTO_FLOW_LABELS	IP6_AUTO_FLOW_LABEL_OPTOUT

static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
					__be32 flowlabel, bool autolabel,
					struct flowi6 *fl6)
{
	u32 hash;

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

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;

hash = skb_get_hash_flowi6(skb, fl6);

/* 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.
	 */
	hash = rol32(hash, 16);

flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;

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

return flowlabel;
}

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;
	}
}
#else
static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
					__be32 flowlabel, bool autolabel,
					struct flowi6 *fl6)
{
	return flowlabel;
}
static inline int ip6_default_np_autolabel(struct net *net)
{
	return 0;
}
#endif

#if IS_ENABLED(CONFIG_IPV6)
static inline int ip6_multipath_hash_policy(const struct net *net)
{
	return net->ipv6.sysctl.multipath_hash_policy;
}
static inline u32 ip6_multipath_hash_fields(const struct net *net)
{
	return net->ipv6.sysctl.multipath_hash_fields;
}
#else
static inline int ip6_multipath_hash_policy(const struct net *net)
{
	return 0;
}
static inline u32 ip6_multipath_hash_fields(const struct net *net)
{
	return 0;
}
#endif

/*
 *	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;
}

static inline __be32 ip6_flowlabel(const struct ipv6hdr *hdr)
{
	return *(__be32 *)hdr & IPV6_FLOWLABEL_MASK;
}

static inline u8 ip6_tclass(__be32 flowinfo)
{
	return ntohl(flowinfo & IPV6_TCLASS_MASK) >> IPV6_TCLASS_SHIFT;
}

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

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

/*
 *	Prototypes exported by ipv6
 */

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

int ipv6_rcv(struct sk_buff *skb, struct net_device *dev,
	     struct packet_type *pt, struct net_device *orig_dev);
void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
		   struct net_device *orig_dev);

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

/*
 *	upper-layer output functions
 */
int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
	     __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);

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),
		    void *from, size_t length, int transhdrlen,
		    struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
		    struct rt6_info *rt, unsigned int flags);

int ip6_push_pending_frames(struct sock *sk);

void ip6_flush_pending_frames(struct sock *sk);

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, size_t length, int transhdrlen,
			     struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
			     struct rt6_info *rt, unsigned int flags,
			     struct inet_cork_full *cork);

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);
}

int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
		   struct flowi6 *fl6);
struct dst_entry *ip6_dst_lookup_flow(struct net *net, const struct sock *sk, struct flowi6 *fl6,
				      const struct in6_addr *final_dst);
struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
					 const struct in6_addr *final_dst,
					 bool connected);
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);
struct dst_entry *ip6_blackhole_route(struct net *net,
				      struct dst_entry *orig_dst);

/*
 *	skb processing functions
 */

int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip6_forward(struct sk_buff *skb);
int ip6_input(struct sk_buff *skb);
int ip6_mc_input(struct sk_buff *skb);
void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
			      bool have_final);

int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);

/*
 *	Extension header (options) processing
 */

void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
			  u8 *proto, struct in6_addr **daddr_p,
			  struct in6_addr *saddr);
void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
			 u8 *proto);

int ipv6_skip_exthdr(const struct sk_buff *, int start, u8 *nexthdrp,
		     __be16 *frag_offp);

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 */
int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, int target,
		  unsigned short *fragoff, int *fragflg);

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

struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
				const struct ipv6_txoptions *opt,
				struct in6_addr *orig);

/*
 *	socket options (ipv6_sockglue.c)
 */

int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
		    unsigned int optlen);
int ipv6_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen);

int __ip6_datagram_connect(struct sock *sk, struct sockaddr *addr,
			   int addr_len);
int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
				 int addr_len);
int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
void ip6_datagram_release_cb(struct sock *sk);

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);
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);

void inet6_cleanup_sock(struct sock *sk);
void inet6_sock_destruct(struct sock *sk);
int inet6_release(struct socket *sock);
int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
		  int peer);
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
		unsigned long arg);

int inet6_hash_connect(struct inet_timewait_death_row *death_row,
			      struct sock *sk);
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);

/*
 * reassembly.c
 */
extern const struct proto_ops inet6_stream_ops;
extern const struct proto_ops inet6_dgram_ops;
extern const struct proto_ops inet6_sockraw_ops;

struct group_source_req;
struct group_filter;

int ip6_mc_source(int add, int omode, struct sock *sk,
		  struct group_source_req *pgsr);
int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
		  struct sockaddr_storage *list);
int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
		  struct sockaddr_storage __user *p);

#ifdef CONFIG_PROC_FS
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);

#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
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);
#endif

int ipv6_sock_mc_join(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);
int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
			  const struct in6_addr *addr, unsigned int mode);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
		      const struct in6_addr *addr);

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;
}

static inline void ip6_sock_set_recverr(struct sock *sk)
{
	lock_sock(sk);
	inet6_sk(sk)->recverr = true;
	release_sock(sk);
}

static inline int __ip6_sock_set_addr_preferences(struct sock *sk, int val)
{
	unsigned int pref = 0;
	unsigned int prefmask = ~0;

/* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */
	switch (val & (IPV6_PREFER_SRC_PUBLIC |
		       IPV6_PREFER_SRC_TMP |
		       IPV6_PREFER_SRC_PUBTMP_DEFAULT)) {
	case IPV6_PREFER_SRC_PUBLIC:
		pref |= IPV6_PREFER_SRC_PUBLIC;
		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
			      IPV6_PREFER_SRC_TMP);
		break;
	case IPV6_PREFER_SRC_TMP:
		pref |= IPV6_PREFER_SRC_TMP;
		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
			      IPV6_PREFER_SRC_TMP);
		break;
	case IPV6_PREFER_SRC_PUBTMP_DEFAULT:
		prefmask &= ~(IPV6_PREFER_SRC_PUBLIC |
			      IPV6_PREFER_SRC_TMP);
		break;
	case 0:
		break;
	default:
		return -EINVAL;
	}

/* check HOME/COA conflicts */
	switch (val & (IPV6_PREFER_SRC_HOME | IPV6_PREFER_SRC_COA)) {
	case IPV6_PREFER_SRC_HOME:
		prefmask &= ~IPV6_PREFER_SRC_COA;
		break;
	case IPV6_PREFER_SRC_COA:
		pref |= IPV6_PREFER_SRC_COA;
		break;
	case 0:
		break;
	default:
		return -EINVAL;
	}

/* check CGA/NONCGA conflicts */
	switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) {
	case IPV6_PREFER_SRC_CGA:
	case IPV6_PREFER_SRC_NONCGA:
	case 0:
		break;
	default:
		return -EINVAL;
	}

inet6_sk(sk)->srcprefs = (inet6_sk(sk)->srcprefs & prefmask) | pref;
	return 0;
}

static inline int ip6_sock_set_addr_preferences(struct sock *sk, int val)
{
	int ret;

lock_sock(sk);
	ret = __ip6_sock_set_addr_preferences(sk, val);
	release_sock(sk);
	return ret;
}

static inline void ip6_sock_set_recvpktinfo(struct sock *sk)
{
	lock_sock(sk);
	inet6_sk(sk)->rxopt.bits.rxinfo = true;
	release_sock(sk);
}

#endif /* _NET_IPV6_H */

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