[mirror_ubuntu-jammy-kernel.git] / include / net / inet_sock.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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>
 */
#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[];
};

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 int inet_sk_bound_l3mdev(const struct sock *sk)
{
#ifdef CONFIG_NET_L3_MASTER_DEV
	struct net *net = sock_net(sk);

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

	return 0;
}

static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
				     int dif, int sdif)
{
	if (!bound_dev_if)
		return !sdif || l3mdev_accept;
	return bound_dev_if == dif || bound_dev_if == sdif;
}

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;
	u32			mark;
};

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,
				recverr_rfc4884:1,
				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);
}

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
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
14c85021 ACM	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* Definitions for inet_sock
	8	*
	9	* Authors: Many, reorganised here by
	10	* Arnaldo Carvalho de Melo <acme@mandriva.com>
14c85021 ACM	11	*/
	12	#ifndef _INET_SOCK_H
	13	#define _INET_SOCK_H
	14
c44d13d6	15	#include <linux/bitops.h>
14c85021 ACM	16	#include <linux/string.h>
14c85021 ACM	17	#include <linux/types.h>
b3da2cf3	18	#include <linux/jhash.h>
fec5e652	19	#include <linux/netdevice.h>
14c85021 ACM	20
	21	#include <net/flow.h>
	22	#include <net/sock.h>
	23	#include <net/request_sock.h>
0b441916	24	#include <net/netns/hash.h>
d34ac51b	25	#include <net/tcp_states.h>
6dd9a14e	26	#include <net/l3mdev.h>
14c85021 ACM	27
	28	/** struct ip_options - IP Options
	29	*
	30	* @faddr - Saved first hop address
ac8a4810	31	* @nexthop - Saved nexthop address in LSRR and SSRR
14c85021 ACM	32	* @is_strictroute - Strict source route
	33	* @srr_is_hit - Packet destination addr was our one
	34	* @is_changed - IP checksum more not valid
	35	* @rr_needaddr - Need to record addr of outgoing dev
	36	* @ts_needtime - Need to record timestamp
	37	* @ts_needaddr - Need to record addr of outgoing dev
	38	*/
	39	struct ip_options {
3ca3c68e	40	__be32 faddr;
ac8a4810	41	__be32 nexthop;
14c85021 ACM	42	unsigned char optlen;
	43	unsigned char srr;
	44	unsigned char rr;
	45	unsigned char ts;
ef722495	46	unsigned char is_strictroute:1,
14c85021 ACM	47	srr_is_hit:1,
	48	is_changed:1,
	49	rr_needaddr:1,
	50	ts_needtime:1,
	51	ts_needaddr:1;
	52	unsigned char router_alert;
11a03f78	53	unsigned char cipso;
14c85021	54	unsigned char __pad2;
48b77df6	55	unsigned char __data[];
14c85021 ACM	56	};
14c85021 ACM	57
f6d8bd05 ED	58	struct ip_options_rcu {
	59	struct rcu_head rcu;
	60	struct ip_options opt;
	61	};
	62
	63	struct ip_options_data {
	64	struct ip_options_rcu opt;
	65	char data[40];
	66	};
14c85021 ACM	67
	68	struct inet_request_sock {
	69	struct request_sock req;
634fb979 ED	70	#define ir_loc_addr req.__req_common.skc_rcv_saddr
634fb979 ED	71	#define ir_rmt_addr req.__req_common.skc_daddr
b44084c2	72	#define ir_num req.__req_common.skc_num
634fb979 ED	73	#define ir_rmt_port req.__req_common.skc_dport
	74	#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
	75	#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
	76	#define ir_iif req.__req_common.skc_bound_dev_if
33cf7c90 ED	77	#define ir_cookie req.__req_common.skc_cookie
33cf7c90 ED	78	#define ireq_net req.__req_common.skc_net
d34ac51b	79	#define ireq_state req.__req_common.skc_state
3f66b083	80	#define ireq_family req.__req_common.skc_family
634fb979	81
45e3ff82 VN	82	u16 snd_wscale : 4,
45e3ff82 VN	83	rcv_wscale : 4,
14c85021 ACM	84	tstamp_ok : 1,
	85	sack_ok : 1,
	86	wscale_ok : 1,
	87	ecn_ok : 1,
88ef4a5a	88	acked : 1,
60e2a778 UB	89	no_srccheck: 1,
60e2a778 UB	90	smc_ok : 1;
adc17d6a	91	u32 ir_mark;
476eab82	92	union {
c92e8c02	93	struct ip_options_rcu __rcu *ireq_opt;
56ac42bc HD	94	#if IS_ENABLED(CONFIG_IPV6)
	95	struct {
	96	struct ipv6_txoptions *ipv6_opt;
	97	struct sk_buff *pktopts;
	98	};
	99	#endif
476eab82	100	};
14c85021 ACM	101	};
	102
	103	static inline struct inet_request_sock inet_rsk(const struct request_sock sk)
	104	{
	105	return (struct inet_request_sock *)sk;
	106	}
	107
adc17d6a	108	static inline u32 inet_request_mark(const struct sock sk, struct sk_buff skb)
84f39b08	109	{
adc17d6a	110	if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
84f39b08	111	return skb->mark;
adc17d6a ED	112
adc17d6a ED	113	return sk->sk_mark;
84f39b08 LC	114	}
84f39b08 LC	115
6dd9a14e DA	116	static inline int inet_request_bound_dev_if(const struct sock *sk,
	117	struct sk_buff *skb)
	118	{
	119	#ifdef CONFIG_NET_L3_MASTER_DEV
	120	struct net *net = sock_net(sk);
	121
	122	if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
	123	return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
	124	#endif
	125
	126	return sk->sk_bound_dev_if;
	127	}
	128
3c82a21f RS	129	static inline int inet_sk_bound_l3mdev(const struct sock *sk)
	130	{
	131	#ifdef CONFIG_NET_L3_MASTER_DEV
	132	struct net *net = sock_net(sk);
	133
	134	if (!net->ipv4.sysctl_tcp_l3mdev_accept)
	135	return l3mdev_master_ifindex_by_index(net,
	136	sk->sk_bound_dev_if);
	137	#endif
	138
	139	return 0;
	140	}
	141
e7819058 MM	142	static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
	143	int dif, int sdif)
	144	{
	145	if (!bound_dev_if)
	146	return !sdif \|\| l3mdev_accept;
	147	return bound_dev_if == dif \|\| bound_dev_if == sdif;
	148	}
	149
1470ddf7 HX	150	struct inet_cork {
1470ddf7 HX	151	unsigned int flags;
bdc712b4	152	__be32 addr;
1470ddf7	153	struct ip_options *opt;
bdc712b4	154	unsigned int fragsize;
1470ddf7	155	int length; /* Total length of all frames */
5640f768	156	struct dst_entry *dst;
1470ddf7	157	u8 tx_flags;
aa661581 FF	158	__u8 ttl;
	159	__s16 tos;
	160	char priority;
bec1f6f6	161	__u16 gso_size;
bc969a97	162	u64 transmit_time;
c6af0c22	163	u32 mark;
1470ddf7 HX	164	};
1470ddf7 HX	165
bdc712b4 DM	166	struct inet_cork_full {
	167	struct inet_cork base;
	168	struct flowi fl;
	169	};
	170
14c85021 ACM	171	struct ip_mc_socklist;
	172	struct ipv6_pinfo;
	173	struct rtable;
	174
	175	/** struct inet_sock - representation of INET sockets
	176	*
	177	* @sk - ancestor class
	178	* @pinet6 - pointer to IPv6 control block
c720c7e8 ED	179	* @inet_daddr - Foreign IPv4 addr
	180	* @inet_rcv_saddr - Bound local IPv4 addr
	181	* @inet_dport - Destination port
	182	* @inet_num - Local port
	183	* @inet_saddr - Sending source
14c85021	184	* @uc_ttl - Unicast TTL
c720c7e8 ED	185	* @inet_sport - Source port
c720c7e8 ED	186	* @inet_id - ID counter for DF pkts
14c85021 ACM	187	* @tos - TOS
	188	* @mc_ttl - Multicasting TTL
	189	* @is_icsk - is this an inet_connection_sock?
76e21053	190	* @uc_index - Unicast outgoing device index
14c85021 ACM	191	* @mc_index - Multicast device index
	192	* @mc_list - Group array
	193	* @cork - info to build ip hdr on each ip frag while socket is corked
	194	*/
	195	struct inet_sock {
	196	/* sk and pinet6 has to be the first two members of inet_sock */
	197	struct sock sk;
dfd56b8b	198	#if IS_ENABLED(CONFIG_IPV6)
14c85021 ACM	199	struct ipv6_pinfo *pinet6;
	200	#endif
	201	/* Socket demultiplex comparisons on incoming packets. */
68835aba ED	202	#define inet_daddr sk.__sk_common.skc_daddr
68835aba ED	203	#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
ce43b03e ED	204	#define inet_dport sk.__sk_common.skc_dport
ce43b03e ED	205	#define inet_num sk.__sk_common.skc_num
68835aba	206
c720c7e8	207	__be32 inet_saddr;
14c85021 ACM	208	__s16 uc_ttl;
14c85021 ACM	209	__u16 cmsg_flags;
c720c7e8 ED	210	__be16 inet_sport;
c720c7e8 ED	211	__u16 inet_id;
d218d111	212
f6d8bd05	213	struct ip_options_rcu __rcu *inet_opt;
ce43b03e	214	int rx_dst_ifindex;
14c85021	215	__u8 tos;
d218d111	216	__u8 min_ttl;
14c85021 ACM	217	__u8 mc_ttl;
	218	__u8 pmtudisc;
	219	__u8 recverr:1,
	220	is_icsk:1,
	221	freebind:1,
	222	hdrincl:1,
f5715aea	223	mc_loop:1,
f771bef9	224	transparent:1,
7b2ff18e JO	225	mc_all:1,
7b2ff18e JO	226	nodefrag:1;
19f6d3f3	227	__u8 bind_address_no_port:1,
eba75c58	228	recverr_rfc4884:1,
19f6d3f3 WW	229	defer_connect:1; /* Indicates that fastopen_connect is set
	230	* and cookie exists so we defer connect
	231	* until first data frame is written
	232	*/
4c507d28	233	__u8 rcv_tos;
224d019c	234	__u8 convert_csum;
76e21053	235	int uc_index;
14c85021	236	int mc_index;
011a9261	237	__be32 mc_addr;
1d7138de	238	struct ip_mc_socklist __rcu *mc_list;
bdc712b4	239	struct inet_cork_full cork;
14c85021 ACM	240	};
	241
	242	#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
	243	#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
	244
c44d13d6 TH	245	/* cmsg flags for inet */
	246	#define IP_CMSG_PKTINFO BIT(0)
	247	#define IP_CMSG_TTL BIT(1)
	248	#define IP_CMSG_TOS BIT(2)
	249	#define IP_CMSG_RECVOPTS BIT(3)
	250	#define IP_CMSG_RETOPTS BIT(4)
	251	#define IP_CMSG_PASSSEC BIT(5)
	252	#define IP_CMSG_ORIGDSTADDR BIT(6)
ad6f939a	253	#define IP_CMSG_CHECKSUM BIT(7)
70ecc248	254	#define IP_CMSG_RECVFRAGSIZE BIT(8)
c44d13d6	255
bd5eb35f ED	256	/**
	257	* sk_to_full_sk - Access to a full socket
	258	* @sk: pointer to a socket
	259	*
	260	* SYNACK messages might be attached to request sockets.
54abc686 ED	261	* Some places want to reach the listener in this case.
54abc686 ED	262	*/
bd5eb35f	263	static inline struct sock sk_to_full_sk(struct sock sk)
54abc686	264	{
bd5eb35f	265	#ifdef CONFIG_INET
54abc686 ED	266	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
54abc686 ED	267	sk = inet_reqsk(sk)->rsk_listener;
bd5eb35f ED	268	#endif
	269	return sk;
	270	}
	271
	272	/* sk_to_full_sk() variant with a const argument */
	273	static inline const struct sock sk_const_to_full_sk(const struct sock sk)
	274	{
	275	#ifdef CONFIG_INET
	276	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
	277	sk = ((const struct request_sock *)sk)->rsk_listener;
	278	#endif
54abc686 ED	279	return sk;
	280	}
	281
bd5eb35f ED	282	static inline struct sock skb_to_full_sk(const struct sk_buff skb)
	283	{
	284	return sk_to_full_sk(skb->sk);
	285	}
	286
14c85021 ACM	287	static inline struct inet_sock inet_sk(const struct sock sk)
	288	{
	289	return (struct inet_sock *)sk;
	290	}
	291
	292	static inline void __inet_sk_copy_descendant(struct sock *sk_to,
	293	const struct sock *sk_from,
	294	const int ancestor_size)
	295	{
	296	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	297	sk_from->sk_prot->obj_size - ancestor_size);
	298	}
14c85021	299
1fd51155	300	int inet_sk_rebuild_header(struct sock *sk);
986ffdfd YS	301
	302	/**
	303	* inet_sk_state_load - read sk->sk_state for lockless contexts
	304	* @sk: socket pointer
	305	*
	306	* Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
	307	* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
	308	*/
	309	static inline int inet_sk_state_load(const struct sock *sk)
	310	{
	311	/* state change might impact lockless readers. */
	312	return smp_load_acquire(&sk->sk_state);
	313	}
	314
	315	/**
	316	* inet_sk_state_store - update sk->sk_state
	317	* @sk: socket pointer
	318	* @newstate: new state
	319	*
	320	* Paired with inet_sk_state_load(). Should be used in contexts where
	321	* state change might impact lockless readers.
	322	*/
563e0bb0	323	void inet_sk_state_store(struct sock *sk, int newstate);
14c85021	324
986ffdfd YS	325	void inet_sk_set_state(struct sock *sk, int state);
986ffdfd YS	326
65cd8033 HFS	327	static inline unsigned int __inet_ehashfn(const __be32 laddr,
	328	const __u16 lport,
	329	const __be32 faddr,
	330	const __be16 fport,
	331	u32 initval)
14c85021	332	{
7adc3830 DM	333	return jhash_3words((__force __u32) laddr,
7adc3830 DM	334	(__force __u32) faddr,
b3da2cf3	335	((__u32) lport) << 16 \| (__force __u32)fport,
65cd8033	336	initval);
14c85021 ACM	337	}
14c85021 ACM	338
e49bb337	339	struct request_sock inet_reqsk_alloc(const struct request_sock_ops ops,
a1a5344d ED	340	struct sock *sk_listener,
a1a5344d ED	341	bool attach_listener);
ce4a7d0d	342
88ef4a5a KK	343	static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
88ef4a5a KK	344	{
a4daad6b DM	345	__u8 flags = 0;
a4daad6b DM	346
47670b76	347	if (inet_sk(sk)->transparent \|\| inet_sk(sk)->hdrincl)
a4daad6b	348	flags \|= FLOWI_FLAG_ANYSRC;
a4daad6b	349	return flags;
88ef4a5a KK	350	}
88ef4a5a KK	351
224d019c TH	352	static inline void inet_inc_convert_csum(struct sock *sk)
	353	{
	354	inet_sk(sk)->convert_csum++;
	355	}
	356
	357	static inline void inet_dec_convert_csum(struct sock *sk)
	358	{
	359	if (inet_sk(sk)->convert_csum > 0)
	360	inet_sk(sk)->convert_csum--;
	361	}
	362
	363	static inline bool inet_get_convert_csum(struct sock *sk)
	364	{
	365	return !!inet_sk(sk)->convert_csum;
	366	}
	367
83ba4645 VB	368
	369	static inline bool inet_can_nonlocal_bind(struct net *net,
	370	struct inet_sock *inet)
	371	{
	372	return net->ipv4.sysctl_ip_nonlocal_bind \|\|
	373	inet->freebind \|\| inet->transparent;
	374	}
	375
14c85021	376	#endif /* _INET_SOCK_H */