[linux-block.git] / include / net / inet_sock.h

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for inet_sock
 *
 * Authors:	Many, reorganised here by
 * 		Arnaldo Carvalho de Melo <acme@mandriva.com>
 *
 *		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 _INET_SOCK_H
#define _INET_SOCK_H

#include <linux/bitops.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/jhash.h>
#include <linux/netdevice.h>

#include <net/flow.h>
#include <net/sock.h>
#include <net/request_sock.h>
#include <net/netns/hash.h>
#include <net/tcp_states.h>
#include <net/l3mdev.h>

/** struct ip_options - IP Options
 *
 * @faddr - Saved first hop address
 * @nexthop - Saved nexthop address in LSRR and SSRR
 * @is_strictroute - Strict source route
 * @srr_is_hit - Packet destination addr was our one
 * @is_changed - IP checksum more not valid
 * @rr_needaddr - Need to record addr of outgoing dev
 * @ts_needtime - Need to record timestamp
 * @ts_needaddr - Need to record addr of outgoing dev
 */
struct ip_options {
	__be32		faddr;
	__be32		nexthop;
	unsigned char	optlen;
	unsigned char	srr;
	unsigned char	rr;
	unsigned char	ts;
	unsigned char	is_strictroute:1,
			srr_is_hit:1,
			is_changed:1,
			rr_needaddr:1,
			ts_needtime:1,
			ts_needaddr:1;
	unsigned char	router_alert;
	unsigned char	cipso;
	unsigned char	__pad2;
	unsigned char	__data[0];
};

struct ip_options_rcu {
	struct rcu_head rcu;
	struct ip_options opt;
};

struct ip_options_data {
	struct ip_options_rcu	opt;
	char			data[40];
};

struct inet_request_sock {
	struct request_sock	req;
#define ir_loc_addr		req.__req_common.skc_rcv_saddr
#define ir_rmt_addr		req.__req_common.skc_daddr
#define ir_num			req.__req_common.skc_num
#define ir_rmt_port		req.__req_common.skc_dport
#define ir_v6_rmt_addr		req.__req_common.skc_v6_daddr
#define ir_v6_loc_addr		req.__req_common.skc_v6_rcv_saddr
#define ir_iif			req.__req_common.skc_bound_dev_if
#define ir_cookie		req.__req_common.skc_cookie
#define ireq_net		req.__req_common.skc_net
#define ireq_state		req.__req_common.skc_state
#define ireq_family		req.__req_common.skc_family

	u16			snd_wscale : 4,
				rcv_wscale : 4,
				tstamp_ok  : 1,
				sack_ok	   : 1,
				wscale_ok  : 1,
				ecn_ok	   : 1,
				acked	   : 1,
				no_srccheck: 1,
				smc_ok	   : 1;
	u32                     ir_mark;
	union {
		struct ip_options_rcu __rcu	*ireq_opt;
#if IS_ENABLED(CONFIG_IPV6)
		struct {
			struct ipv6_txoptions	*ipv6_opt;
			struct sk_buff		*pktopts;
		};
#endif
	};
};

static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
{
	return (struct inet_request_sock *)sk;
}

static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
{
	if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
		return skb->mark;

	return sk->sk_mark;
}

static inline int inet_request_bound_dev_if(const struct sock *sk,
					    struct sk_buff *skb)
{
#ifdef CONFIG_NET_L3_MASTER_DEV
	struct net *net = sock_net(sk);

	if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
		return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
#endif

	return sk->sk_bound_dev_if;
}

static inline struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq)
{
	return rcu_dereference_check(ireq->ireq_opt,
				     refcount_read(&ireq->req.rsk_refcnt) > 0);
}

struct inet_cork {
	unsigned int		flags;
	__be32			addr;
	struct ip_options	*opt;
	unsigned int		fragsize;
	int			length; /* Total length of all frames */
	struct dst_entry	*dst;
	u8			tx_flags;
	__u8			ttl;
	__s16			tos;
	char			priority;
	__u16			gso_size;
	u64			transmit_time;
};

struct inet_cork_full {
	struct inet_cork	base;
	struct flowi		fl;
};

struct ip_mc_socklist;
struct ipv6_pinfo;
struct rtable;

/** struct inet_sock - representation of INET sockets
 *
 * @sk - ancestor class
 * @pinet6 - pointer to IPv6 control block
 * @inet_daddr - Foreign IPv4 addr
 * @inet_rcv_saddr - Bound local IPv4 addr
 * @inet_dport - Destination port
 * @inet_num - Local port
 * @inet_saddr - Sending source
 * @uc_ttl - Unicast TTL
 * @inet_sport - Source port
 * @inet_id - ID counter for DF pkts
 * @tos - TOS
 * @mc_ttl - Multicasting TTL
 * @is_icsk - is this an inet_connection_sock?
 * @uc_index - Unicast outgoing device index
 * @mc_index - Multicast device index
 * @mc_list - Group array
 * @cork - info to build ip hdr on each ip frag while socket is corked
 */
struct inet_sock {
	/* sk and pinet6 has to be the first two members of inet_sock */
	struct sock		sk;
#if IS_ENABLED(CONFIG_IPV6)
	struct ipv6_pinfo	*pinet6;
#endif
	/* Socket demultiplex comparisons on incoming packets. */
#define inet_daddr		sk.__sk_common.skc_daddr
#define inet_rcv_saddr		sk.__sk_common.skc_rcv_saddr
#define inet_dport		sk.__sk_common.skc_dport
#define inet_num		sk.__sk_common.skc_num

	__be32			inet_saddr;
	__s16			uc_ttl;
	__u16			cmsg_flags;
	__be16			inet_sport;
	__u16			inet_id;

	struct ip_options_rcu __rcu	*inet_opt;
	int			rx_dst_ifindex;
	__u8			tos;
	__u8			min_ttl;
	__u8			mc_ttl;
	__u8			pmtudisc;
	__u8			recverr:1,
				is_icsk:1,
				freebind:1,
				hdrincl:1,
				mc_loop:1,
				transparent:1,
				mc_all:1,
				nodefrag:1;
	__u8			bind_address_no_port:1,
				defer_connect:1; /* Indicates that fastopen_connect is set
						  * and cookie exists so we defer connect
						  * until first data frame is written
						  */
	__u8			rcv_tos;
	__u8			convert_csum;
	int			uc_index;
	int			mc_index;
	__be32			mc_addr;
	struct ip_mc_socklist __rcu	*mc_list;
	struct inet_cork_full	cork;
};

#define IPCORK_OPT	1	/* ip-options has been held in ipcork.opt */
#define IPCORK_ALLFRAG	2	/* always fragment (for ipv6 for now) */

/* cmsg flags for inet */
#define IP_CMSG_PKTINFO		BIT(0)
#define IP_CMSG_TTL		BIT(1)
#define IP_CMSG_TOS		BIT(2)
#define IP_CMSG_RECVOPTS	BIT(3)
#define IP_CMSG_RETOPTS		BIT(4)
#define IP_CMSG_PASSSEC		BIT(5)
#define IP_CMSG_ORIGDSTADDR	BIT(6)
#define IP_CMSG_CHECKSUM	BIT(7)
#define IP_CMSG_RECVFRAGSIZE	BIT(8)

/**
 * sk_to_full_sk - Access to a full socket
 * @sk: pointer to a socket
 *
 * SYNACK messages might be attached to request sockets.
 * Some places want to reach the listener in this case.
 */
static inline struct sock *sk_to_full_sk(struct sock *sk)
{
#ifdef CONFIG_INET
	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
		sk = inet_reqsk(sk)->rsk_listener;
#endif
	return sk;
}

/* sk_to_full_sk() variant with a const argument */
static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
{
#ifdef CONFIG_INET
	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
		sk = ((const struct request_sock *)sk)->rsk_listener;
#endif
	return sk;
}

static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
{
	return sk_to_full_sk(skb->sk);
}

static inline struct inet_sock *inet_sk(const struct sock *sk)
{
	return (struct inet_sock *)sk;
}

static inline void __inet_sk_copy_descendant(struct sock *sk_to,
					     const struct sock *sk_from,
					     const int ancestor_size)
{
	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	       sk_from->sk_prot->obj_size - ancestor_size);
}
#if !(IS_ENABLED(CONFIG_IPV6))
static inline void inet_sk_copy_descendant(struct sock *sk_to,
					   const struct sock *sk_from)
{
	__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
}
#endif

int inet_sk_rebuild_header(struct sock *sk);

/**
 * inet_sk_state_load - read sk->sk_state for lockless contexts
 * @sk: socket pointer
 *
 * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
 * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
 */
static inline int inet_sk_state_load(const struct sock *sk)
{
	/* state change might impact lockless readers. */
	return smp_load_acquire(&sk->sk_state);
}

/**
 * inet_sk_state_store - update sk->sk_state
 * @sk: socket pointer
 * @newstate: new state
 *
 * Paired with inet_sk_state_load(). Should be used in contexts where
 * state change might impact lockless readers.
 */
void inet_sk_state_store(struct sock *sk, int newstate);

void inet_sk_set_state(struct sock *sk, int state);

static inline unsigned int __inet_ehashfn(const __be32 laddr,
					  const __u16 lport,
					  const __be32 faddr,
					  const __be16 fport,
					  u32 initval)
{
	return jhash_3words((__force __u32) laddr,
			    (__force __u32) faddr,
			    ((__u32) lport) << 16 | (__force __u32)fport,
			    initval);
}

struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
				      struct sock *sk_listener,
				      bool attach_listener);

static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
{
	__u8 flags = 0;

	if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
		flags |= FLOWI_FLAG_ANYSRC;
	return flags;
}

static inline void inet_inc_convert_csum(struct sock *sk)
{
	inet_sk(sk)->convert_csum++;
}

static inline void inet_dec_convert_csum(struct sock *sk)
{
	if (inet_sk(sk)->convert_csum > 0)
		inet_sk(sk)->convert_csum--;
}

static inline bool inet_get_convert_csum(struct sock *sk)
{
	return !!inet_sk(sk)->convert_csum;
}


static inline bool inet_can_nonlocal_bind(struct net *net,
					  struct inet_sock *inet)
{
	return net->ipv4.sysctl_ip_nonlocal_bind ||
		inet->freebind || inet->transparent;
}

#endif	/* _INET_SOCK_H */
Commit	Line	Data
14c85021 ACM	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for inet_sock
	7	*
	8	* Authors: Many, reorganised here by
	9	* Arnaldo Carvalho de Melo <acme@mandriva.com>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* as published by the Free Software Foundation; either version
	14	* 2 of the License, or (at your option) any later version.
	15	*/
	16	#ifndef _INET_SOCK_H
	17	#define _INET_SOCK_H
	18
c44d13d6	19	#include <linux/bitops.h>
14c85021 ACM	20	#include <linux/string.h>
14c85021 ACM	21	#include <linux/types.h>
b3da2cf3	22	#include <linux/jhash.h>
fec5e652	23	#include <linux/netdevice.h>
14c85021 ACM	24
	25	#include <net/flow.h>
	26	#include <net/sock.h>
	27	#include <net/request_sock.h>
0b441916	28	#include <net/netns/hash.h>
d34ac51b	29	#include <net/tcp_states.h>
6dd9a14e	30	#include <net/l3mdev.h>
14c85021 ACM	31
	32	/** struct ip_options - IP Options
	33	*
	34	* @faddr - Saved first hop address
ac8a4810	35	* @nexthop - Saved nexthop address in LSRR and SSRR
14c85021 ACM	36	* @is_strictroute - Strict source route
	37	* @srr_is_hit - Packet destination addr was our one
	38	* @is_changed - IP checksum more not valid
	39	* @rr_needaddr - Need to record addr of outgoing dev
	40	* @ts_needtime - Need to record timestamp
	41	* @ts_needaddr - Need to record addr of outgoing dev
	42	*/
	43	struct ip_options {
3ca3c68e	44	__be32 faddr;
ac8a4810	45	__be32 nexthop;
14c85021 ACM	46	unsigned char optlen;
	47	unsigned char srr;
	48	unsigned char rr;
	49	unsigned char ts;
ef722495	50	unsigned char is_strictroute:1,
14c85021 ACM	51	srr_is_hit:1,
	52	is_changed:1,
	53	rr_needaddr:1,
	54	ts_needtime:1,
	55	ts_needaddr:1;
	56	unsigned char router_alert;
11a03f78	57	unsigned char cipso;
14c85021 ACM	58	unsigned char __pad2;
	59	unsigned char __data[0];
	60	};
	61
f6d8bd05 ED	62	struct ip_options_rcu {
	63	struct rcu_head rcu;
	64	struct ip_options opt;
	65	};
	66
	67	struct ip_options_data {
	68	struct ip_options_rcu opt;
	69	char data[40];
	70	};
14c85021 ACM	71
	72	struct inet_request_sock {
	73	struct request_sock req;
634fb979 ED	74	#define ir_loc_addr req.__req_common.skc_rcv_saddr
634fb979 ED	75	#define ir_rmt_addr req.__req_common.skc_daddr
b44084c2	76	#define ir_num req.__req_common.skc_num
634fb979 ED	77	#define ir_rmt_port req.__req_common.skc_dport
	78	#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
	79	#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
	80	#define ir_iif req.__req_common.skc_bound_dev_if
33cf7c90 ED	81	#define ir_cookie req.__req_common.skc_cookie
33cf7c90 ED	82	#define ireq_net req.__req_common.skc_net
d34ac51b	83	#define ireq_state req.__req_common.skc_state
3f66b083	84	#define ireq_family req.__req_common.skc_family
634fb979	85
45e3ff82 VN	86	u16 snd_wscale : 4,
45e3ff82 VN	87	rcv_wscale : 4,
14c85021 ACM	88	tstamp_ok : 1,
	89	sack_ok : 1,
	90	wscale_ok : 1,
	91	ecn_ok : 1,
88ef4a5a	92	acked : 1,
60e2a778 UB	93	no_srccheck: 1,
60e2a778 UB	94	smc_ok : 1;
adc17d6a	95	u32 ir_mark;
476eab82	96	union {
c92e8c02	97	struct ip_options_rcu __rcu *ireq_opt;
56ac42bc HD	98	#if IS_ENABLED(CONFIG_IPV6)
	99	struct {
	100	struct ipv6_txoptions *ipv6_opt;
	101	struct sk_buff *pktopts;
	102	};
	103	#endif
476eab82	104	};
14c85021 ACM	105	};
	106
	107	static inline struct inet_request_sock inet_rsk(const struct request_sock sk)
	108	{
	109	return (struct inet_request_sock *)sk;
	110	}
	111
adc17d6a	112	static inline u32 inet_request_mark(const struct sock sk, struct sk_buff skb)
84f39b08	113	{
adc17d6a	114	if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
84f39b08	115	return skb->mark;
adc17d6a ED	116
adc17d6a ED	117	return sk->sk_mark;
84f39b08 LC	118	}
84f39b08 LC	119
6dd9a14e DA	120	static inline int inet_request_bound_dev_if(const struct sock *sk,
	121	struct sk_buff *skb)
	122	{
	123	#ifdef CONFIG_NET_L3_MASTER_DEV
	124	struct net *net = sock_net(sk);
	125
	126	if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
	127	return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
	128	#endif
	129
	130	return sk->sk_bound_dev_if;
	131	}
	132
06f877d6 ED	133	static inline struct ip_options_rcu ireq_opt_deref(const struct inet_request_sock ireq)
	134	{
	135	return rcu_dereference_check(ireq->ireq_opt,
	136	refcount_read(&ireq->req.rsk_refcnt) > 0);
	137	}
	138
1470ddf7 HX	139	struct inet_cork {
1470ddf7 HX	140	unsigned int flags;
bdc712b4	141	__be32 addr;
1470ddf7	142	struct ip_options *opt;
bdc712b4	143	unsigned int fragsize;
1470ddf7	144	int length; /* Total length of all frames */
5640f768	145	struct dst_entry *dst;
1470ddf7	146	u8 tx_flags;
aa661581 FF	147	__u8 ttl;
	148	__s16 tos;
	149	char priority;
bec1f6f6	150	__u16 gso_size;
bc969a97	151	u64 transmit_time;
1470ddf7 HX	152	};
1470ddf7 HX	153
bdc712b4 DM	154	struct inet_cork_full {
	155	struct inet_cork base;
	156	struct flowi fl;
	157	};
	158
14c85021 ACM	159	struct ip_mc_socklist;
	160	struct ipv6_pinfo;
	161	struct rtable;
	162
	163	/** struct inet_sock - representation of INET sockets
	164	*
	165	* @sk - ancestor class
	166	* @pinet6 - pointer to IPv6 control block
c720c7e8 ED	167	* @inet_daddr - Foreign IPv4 addr
	168	* @inet_rcv_saddr - Bound local IPv4 addr
	169	* @inet_dport - Destination port
	170	* @inet_num - Local port
	171	* @inet_saddr - Sending source
14c85021	172	* @uc_ttl - Unicast TTL
c720c7e8 ED	173	* @inet_sport - Source port
c720c7e8 ED	174	* @inet_id - ID counter for DF pkts
14c85021 ACM	175	* @tos - TOS
	176	* @mc_ttl - Multicasting TTL
	177	* @is_icsk - is this an inet_connection_sock?
76e21053	178	* @uc_index - Unicast outgoing device index
14c85021 ACM	179	* @mc_index - Multicast device index
	180	* @mc_list - Group array
	181	* @cork - info to build ip hdr on each ip frag while socket is corked
	182	*/
	183	struct inet_sock {
	184	/* sk and pinet6 has to be the first two members of inet_sock */
	185	struct sock sk;
dfd56b8b	186	#if IS_ENABLED(CONFIG_IPV6)
14c85021 ACM	187	struct ipv6_pinfo *pinet6;
	188	#endif
	189	/* Socket demultiplex comparisons on incoming packets. */
68835aba ED	190	#define inet_daddr sk.__sk_common.skc_daddr
68835aba ED	191	#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
ce43b03e ED	192	#define inet_dport sk.__sk_common.skc_dport
ce43b03e ED	193	#define inet_num sk.__sk_common.skc_num
68835aba	194
c720c7e8	195	__be32 inet_saddr;
14c85021 ACM	196	__s16 uc_ttl;
14c85021 ACM	197	__u16 cmsg_flags;
c720c7e8 ED	198	__be16 inet_sport;
c720c7e8 ED	199	__u16 inet_id;
d218d111	200
f6d8bd05	201	struct ip_options_rcu __rcu *inet_opt;
ce43b03e	202	int rx_dst_ifindex;
14c85021	203	__u8 tos;
d218d111	204	__u8 min_ttl;
14c85021 ACM	205	__u8 mc_ttl;
	206	__u8 pmtudisc;
	207	__u8 recverr:1,
	208	is_icsk:1,
	209	freebind:1,
	210	hdrincl:1,
f5715aea	211	mc_loop:1,
f771bef9	212	transparent:1,
7b2ff18e JO	213	mc_all:1,
7b2ff18e JO	214	nodefrag:1;
19f6d3f3 WW	215	__u8 bind_address_no_port:1,
	216	defer_connect:1; /* Indicates that fastopen_connect is set
	217	* and cookie exists so we defer connect
	218	* until first data frame is written
	219	*/
4c507d28	220	__u8 rcv_tos;
224d019c	221	__u8 convert_csum;
76e21053	222	int uc_index;
14c85021	223	int mc_index;
011a9261	224	__be32 mc_addr;
1d7138de	225	struct ip_mc_socklist __rcu *mc_list;
bdc712b4	226	struct inet_cork_full cork;
14c85021 ACM	227	};
	228
	229	#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
	230	#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
	231
c44d13d6 TH	232	/* cmsg flags for inet */
	233	#define IP_CMSG_PKTINFO BIT(0)
	234	#define IP_CMSG_TTL BIT(1)
	235	#define IP_CMSG_TOS BIT(2)
	236	#define IP_CMSG_RECVOPTS BIT(3)
	237	#define IP_CMSG_RETOPTS BIT(4)
	238	#define IP_CMSG_PASSSEC BIT(5)
	239	#define IP_CMSG_ORIGDSTADDR BIT(6)
ad6f939a	240	#define IP_CMSG_CHECKSUM BIT(7)
70ecc248	241	#define IP_CMSG_RECVFRAGSIZE BIT(8)
c44d13d6	242
bd5eb35f ED	243	/**
	244	* sk_to_full_sk - Access to a full socket
	245	* @sk: pointer to a socket
	246	*
	247	* SYNACK messages might be attached to request sockets.
54abc686 ED	248	* Some places want to reach the listener in this case.
54abc686 ED	249	*/
bd5eb35f	250	static inline struct sock sk_to_full_sk(struct sock sk)
54abc686	251	{
bd5eb35f	252	#ifdef CONFIG_INET
54abc686 ED	253	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
54abc686 ED	254	sk = inet_reqsk(sk)->rsk_listener;
bd5eb35f ED	255	#endif
	256	return sk;
	257	}
	258
	259	/* sk_to_full_sk() variant with a const argument */
	260	static inline const struct sock sk_const_to_full_sk(const struct sock sk)
	261	{
	262	#ifdef CONFIG_INET
	263	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
	264	sk = ((const struct request_sock *)sk)->rsk_listener;
	265	#endif
54abc686 ED	266	return sk;
	267	}
	268
bd5eb35f ED	269	static inline struct sock skb_to_full_sk(const struct sk_buff skb)
	270	{
	271	return sk_to_full_sk(skb->sk);
	272	}
	273
14c85021 ACM	274	static inline struct inet_sock inet_sk(const struct sock sk)
	275	{
	276	return (struct inet_sock *)sk;
	277	}
	278
	279	static inline void __inet_sk_copy_descendant(struct sock *sk_to,
	280	const struct sock *sk_from,
	281	const int ancestor_size)
	282	{
	283	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	284	sk_from->sk_prot->obj_size - ancestor_size);
	285	}
dfd56b8b	286	#if !(IS_ENABLED(CONFIG_IPV6))
14c85021 ACM	287	static inline void inet_sk_copy_descendant(struct sock *sk_to,
	288	const struct sock *sk_from)
	289	{
	290	__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
	291	}
	292	#endif
	293
1fd51155	294	int inet_sk_rebuild_header(struct sock *sk);
986ffdfd YS	295
	296	/**
	297	* inet_sk_state_load - read sk->sk_state for lockless contexts
	298	* @sk: socket pointer
	299	*
	300	* Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
	301	* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
	302	*/
	303	static inline int inet_sk_state_load(const struct sock *sk)
	304	{
	305	/* state change might impact lockless readers. */
	306	return smp_load_acquire(&sk->sk_state);
	307	}
	308
	309	/**
	310	* inet_sk_state_store - update sk->sk_state
	311	* @sk: socket pointer
	312	* @newstate: new state
	313	*
	314	* Paired with inet_sk_state_load(). Should be used in contexts where
	315	* state change might impact lockless readers.
	316	*/
563e0bb0	317	void inet_sk_state_store(struct sock *sk, int newstate);
14c85021	318
986ffdfd YS	319	void inet_sk_set_state(struct sock *sk, int state);
986ffdfd YS	320
65cd8033 HFS	321	static inline unsigned int __inet_ehashfn(const __be32 laddr,
	322	const __u16 lport,
	323	const __be32 faddr,
	324	const __be16 fport,
	325	u32 initval)
14c85021	326	{
7adc3830 DM	327	return jhash_3words((__force __u32) laddr,
7adc3830 DM	328	(__force __u32) faddr,
b3da2cf3	329	((__u32) lport) << 16 \| (__force __u32)fport,
65cd8033	330	initval);
14c85021 ACM	331	}
14c85021 ACM	332
e49bb337	333	struct request_sock inet_reqsk_alloc(const struct request_sock_ops ops,
a1a5344d ED	334	struct sock *sk_listener,
a1a5344d ED	335	bool attach_listener);
ce4a7d0d	336
88ef4a5a KK	337	static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
88ef4a5a KK	338	{
a4daad6b DM	339	__u8 flags = 0;
a4daad6b DM	340
47670b76	341	if (inet_sk(sk)->transparent \|\| inet_sk(sk)->hdrincl)
a4daad6b	342	flags \|= FLOWI_FLAG_ANYSRC;
a4daad6b	343	return flags;
88ef4a5a KK	344	}
88ef4a5a KK	345
224d019c TH	346	static inline void inet_inc_convert_csum(struct sock *sk)
	347	{
	348	inet_sk(sk)->convert_csum++;
	349	}
	350
	351	static inline void inet_dec_convert_csum(struct sock *sk)
	352	{
	353	if (inet_sk(sk)->convert_csum > 0)
	354	inet_sk(sk)->convert_csum--;
	355	}
	356
	357	static inline bool inet_get_convert_csum(struct sock *sk)
	358	{
	359	return !!inet_sk(sk)->convert_csum;
	360	}
	361
83ba4645 VB	362
	363	static inline bool inet_can_nonlocal_bind(struct net *net,
	364	struct inet_sock *inet)
	365	{
	366	return net->ipv4.sysctl_ip_nonlocal_bind \|\|
	367	inet->freebind \|\| inet->transparent;
	368	}
	369
14c85021	370	#endif /* _INET_SOCK_H */