[linux-block.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 &&
	    READ_ONCE(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)
{
	int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
#ifdef CONFIG_NET_L3_MASTER_DEV
	struct net *net = sock_net(sk);

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

	return 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 (!READ_ONCE(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;
}

static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
					int dif, int sdif)
{
#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
	return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept),
				 bound_dev_if, dif, sdif);
#else
	return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
#endif
}

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;
	struct ip_options_rcu __rcu	*inet_opt;
	__be16			inet_sport;
	__u16			inet_id;

	__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;
	struct {
		__u16 lo;
		__u16 hi;
	}			local_port_range;
};

#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)

static inline bool sk_is_inet(struct sock *sk)
{
	return sk->sk_family == AF_INET || sk->sk_family == AF_INET6;
}

/**
 * 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);
}

#define inet_sk(ptr) container_of_const(ptr, 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 READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) ||
		inet->freebind || inet->transparent;
}

static inline bool inet_addr_valid_or_nonlocal(struct net *net,
					       struct inet_sock *inet,
					       __be32 addr,
					       int addr_type)
{
	return inet_can_nonlocal_bind(net, inet) ||
		addr == htonl(INADDR_ANY) ||
		addr_type == RTN_LOCAL ||
		addr_type == RTN_MULTICAST ||
		addr_type == RTN_BROADCAST;
}

#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	{
1a0008f9 KI	110	if (!sk->sk_mark &&
1a0008f9 KI	111	READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
84f39b08	112	return skb->mark;
adc17d6a ED	113
adc17d6a ED	114	return sk->sk_mark;
84f39b08 LC	115	}
84f39b08 LC	116
6dd9a14e DA	117	static inline int inet_request_bound_dev_if(const struct sock *sk,
	118	struct sk_buff *skb)
	119	{
fdb5fd7f	120	int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
6dd9a14e DA	121	#ifdef CONFIG_NET_L3_MASTER_DEV
	122	struct net *net = sock_net(sk);
	123
08a75f10	124	if (!bound_dev_if && READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
6dd9a14e DA	125	return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
	126	#endif
	127
fdb5fd7f	128	return bound_dev_if;
6dd9a14e DA	129	}
6dd9a14e DA	130
3c82a21f RS	131	static inline int inet_sk_bound_l3mdev(const struct sock *sk)
	132	{
	133	#ifdef CONFIG_NET_L3_MASTER_DEV
	134	struct net *net = sock_net(sk);
	135
08a75f10	136	if (!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
3c82a21f RS	137	return l3mdev_master_ifindex_by_index(net,
	138	sk->sk_bound_dev_if);
	139	#endif
	140
	141	return 0;
	142	}
	143
e7819058 MM	144	static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
	145	int dif, int sdif)
	146	{
	147	if (!bound_dev_if)
	148	return !sdif \|\| l3mdev_accept;
	149	return bound_dev_if == dif \|\| bound_dev_if == sdif;
	150	}
	151
944fd1ae MM	152	static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
	153	int dif, int sdif)
	154	{
	155	#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
	156	return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept),
	157	bound_dev_if, dif, sdif);
	158	#else
	159	return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
	160	#endif
	161	}
	162
1470ddf7 HX	163	struct inet_cork {
1470ddf7 HX	164	unsigned int flags;
bdc712b4	165	__be32 addr;
1470ddf7	166	struct ip_options *opt;
bdc712b4	167	unsigned int fragsize;
1470ddf7	168	int length; /* Total length of all frames */
5640f768	169	struct dst_entry *dst;
1470ddf7	170	u8 tx_flags;
aa661581 FF	171	__u8 ttl;
	172	__s16 tos;
	173	char priority;
bec1f6f6	174	__u16 gso_size;
bc969a97	175	u64 transmit_time;
c6af0c22	176	u32 mark;
1470ddf7 HX	177	};
1470ddf7 HX	178
bdc712b4 DM	179	struct inet_cork_full {
	180	struct inet_cork base;
	181	struct flowi fl;
	182	};
	183
14c85021 ACM	184	struct ip_mc_socklist;
	185	struct ipv6_pinfo;
	186	struct rtable;
	187
	188	/** struct inet_sock - representation of INET sockets
	189	*
	190	* @sk - ancestor class
	191	* @pinet6 - pointer to IPv6 control block
c720c7e8 ED	192	* @inet_daddr - Foreign IPv4 addr
	193	* @inet_rcv_saddr - Bound local IPv4 addr
	194	* @inet_dport - Destination port
	195	* @inet_num - Local port
	196	* @inet_saddr - Sending source
14c85021	197	* @uc_ttl - Unicast TTL
c720c7e8 ED	198	* @inet_sport - Source port
c720c7e8 ED	199	* @inet_id - ID counter for DF pkts
14c85021 ACM	200	* @tos - TOS
	201	* @mc_ttl - Multicasting TTL
	202	* @is_icsk - is this an inet_connection_sock?
76e21053	203	* @uc_index - Unicast outgoing device index
14c85021 ACM	204	* @mc_index - Multicast device index
	205	* @mc_list - Group array
	206	* @cork - info to build ip hdr on each ip frag while socket is corked
	207	*/
	208	struct inet_sock {
	209	/* sk and pinet6 has to be the first two members of inet_sock */
	210	struct sock sk;
dfd56b8b	211	#if IS_ENABLED(CONFIG_IPV6)
14c85021 ACM	212	struct ipv6_pinfo *pinet6;
	213	#endif
	214	/* Socket demultiplex comparisons on incoming packets. */
68835aba ED	215	#define inet_daddr sk.__sk_common.skc_daddr
68835aba ED	216	#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
ce43b03e ED	217	#define inet_dport sk.__sk_common.skc_dport
ce43b03e ED	218	#define inet_num sk.__sk_common.skc_num
68835aba	219
c720c7e8	220	__be32 inet_saddr;
14c85021 ACM	221	__s16 uc_ttl;
14c85021 ACM	222	__u16 cmsg_flags;
0c0a5ef8	223	struct ip_options_rcu __rcu *inet_opt;
c720c7e8 ED	224	__be16 inet_sport;
c720c7e8 ED	225	__u16 inet_id;
d218d111	226
14c85021	227	__u8 tos;
d218d111	228	__u8 min_ttl;
14c85021 ACM	229	__u8 mc_ttl;
	230	__u8 pmtudisc;
	231	__u8 recverr:1,
	232	is_icsk:1,
	233	freebind:1,
	234	hdrincl:1,
f5715aea	235	mc_loop:1,
f771bef9	236	transparent:1,
7b2ff18e JO	237	mc_all:1,
7b2ff18e JO	238	nodefrag:1;
19f6d3f3	239	__u8 bind_address_no_port:1,
eba75c58	240	recverr_rfc4884:1,
19f6d3f3 WW	241	defer_connect:1; /* Indicates that fastopen_connect is set
	242	* and cookie exists so we defer connect
	243	* until first data frame is written
	244	*/
4c507d28	245	__u8 rcv_tos;
224d019c	246	__u8 convert_csum;
76e21053	247	int uc_index;
14c85021	248	int mc_index;
011a9261	249	__be32 mc_addr;
1d7138de	250	struct ip_mc_socklist __rcu *mc_list;
bdc712b4	251	struct inet_cork_full cork;
91d0b78c JS	252	struct {
	253	__u16 lo;
	254	__u16 hi;
	255	} local_port_range;
14c85021 ACM	256	};
	257
	258	#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
	259	#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
	260
c44d13d6 TH	261	/* cmsg flags for inet */
	262	#define IP_CMSG_PKTINFO BIT(0)
	263	#define IP_CMSG_TTL BIT(1)
	264	#define IP_CMSG_TOS BIT(2)
	265	#define IP_CMSG_RECVOPTS BIT(3)
	266	#define IP_CMSG_RETOPTS BIT(4)
	267	#define IP_CMSG_PASSSEC BIT(5)
	268	#define IP_CMSG_ORIGDSTADDR BIT(6)
ad6f939a	269	#define IP_CMSG_CHECKSUM BIT(7)
70ecc248	270	#define IP_CMSG_RECVFRAGSIZE BIT(8)
c44d13d6	271
e34a07c0 JK	272	static inline bool sk_is_inet(struct sock *sk)
	273	{
	274	return sk->sk_family == AF_INET \|\| sk->sk_family == AF_INET6;
	275	}
	276
bd5eb35f ED	277	/**
	278	* sk_to_full_sk - Access to a full socket
	279	* @sk: pointer to a socket
	280	*
	281	* SYNACK messages might be attached to request sockets.
54abc686 ED	282	* Some places want to reach the listener in this case.
54abc686 ED	283	*/
bd5eb35f	284	static inline struct sock sk_to_full_sk(struct sock sk)
54abc686	285	{
bd5eb35f	286	#ifdef CONFIG_INET
54abc686 ED	287	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
54abc686 ED	288	sk = inet_reqsk(sk)->rsk_listener;
bd5eb35f ED	289	#endif
	290	return sk;
	291	}
	292
	293	/* sk_to_full_sk() variant with a const argument */
	294	static inline const struct sock sk_const_to_full_sk(const struct sock sk)
	295	{
	296	#ifdef CONFIG_INET
	297	if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
	298	sk = ((const struct request_sock *)sk)->rsk_listener;
	299	#endif
54abc686 ED	300	return sk;
	301	}
	302
bd5eb35f ED	303	static inline struct sock skb_to_full_sk(const struct sk_buff skb)
	304	{
	305	return sk_to_full_sk(skb->sk);
	306	}
	307
abc17a11	308	#define inet_sk(ptr) container_of_const(ptr, struct inet_sock, sk)
14c85021 ACM	309
	310	static inline void __inet_sk_copy_descendant(struct sock *sk_to,
	311	const struct sock *sk_from,
	312	const int ancestor_size)
	313	{
	314	memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
	315	sk_from->sk_prot->obj_size - ancestor_size);
	316	}
14c85021	317
1fd51155	318	int inet_sk_rebuild_header(struct sock *sk);
986ffdfd YS	319
	320	/**
	321	* inet_sk_state_load - read sk->sk_state for lockless contexts
	322	* @sk: socket pointer
	323	*
	324	* Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
	325	* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
	326	*/
	327	static inline int inet_sk_state_load(const struct sock *sk)
	328	{
	329	/* state change might impact lockless readers. */
	330	return smp_load_acquire(&sk->sk_state);
	331	}
	332
	333	/**
	334	* inet_sk_state_store - update sk->sk_state
	335	* @sk: socket pointer
	336	* @newstate: new state
	337	*
	338	* Paired with inet_sk_state_load(). Should be used in contexts where
	339	* state change might impact lockless readers.
	340	*/
563e0bb0	341	void inet_sk_state_store(struct sock *sk, int newstate);
14c85021	342
986ffdfd YS	343	void inet_sk_set_state(struct sock *sk, int state);
986ffdfd YS	344
65cd8033 HFS	345	static inline unsigned int __inet_ehashfn(const __be32 laddr,
	346	const __u16 lport,
	347	const __be32 faddr,
	348	const __be16 fport,
	349	u32 initval)
14c85021	350	{
7adc3830 DM	351	return jhash_3words((__force __u32) laddr,
7adc3830 DM	352	(__force __u32) faddr,
b3da2cf3	353	((__u32) lport) << 16 \| (__force __u32)fport,
65cd8033	354	initval);
14c85021 ACM	355	}
14c85021 ACM	356
e49bb337	357	struct request_sock inet_reqsk_alloc(const struct request_sock_ops ops,
a1a5344d ED	358	struct sock *sk_listener,
a1a5344d ED	359	bool attach_listener);
ce4a7d0d	360
88ef4a5a KK	361	static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
88ef4a5a KK	362	{
a4daad6b DM	363	__u8 flags = 0;
a4daad6b DM	364
47670b76	365	if (inet_sk(sk)->transparent \|\| inet_sk(sk)->hdrincl)
a4daad6b	366	flags \|= FLOWI_FLAG_ANYSRC;
a4daad6b	367	return flags;
88ef4a5a KK	368	}
88ef4a5a KK	369
224d019c TH	370	static inline void inet_inc_convert_csum(struct sock *sk)
	371	{
	372	inet_sk(sk)->convert_csum++;
	373	}
	374
	375	static inline void inet_dec_convert_csum(struct sock *sk)
	376	{
	377	if (inet_sk(sk)->convert_csum > 0)
	378	inet_sk(sk)->convert_csum--;
	379	}
	380
	381	static inline bool inet_get_convert_csum(struct sock *sk)
	382	{
	383	return !!inet_sk(sk)->convert_csum;
	384	}
	385
83ba4645 VB	386
	387	static inline bool inet_can_nonlocal_bind(struct net *net,
	388	struct inet_sock *inet)
	389	{
289d3b21	390	return READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) \|\|
83ba4645 VB	391	inet->freebind \|\| inet->transparent;
	392	}
	393
8ff978b8 RPB	394	static inline bool inet_addr_valid_or_nonlocal(struct net *net,
	395	struct inet_sock *inet,
	396	__be32 addr,
	397	int addr_type)
	398	{
	399	return inet_can_nonlocal_bind(net, inet) \|\|
	400	addr == htonl(INADDR_ANY) \|\|
	401	addr_type == RTN_LOCAL \|\|
	402	addr_type == RTN_MULTICAST \|\|
	403	addr_type == RTN_BROADCAST;
	404	}
	405
14c85021	406	#endif /* _INET_SOCK_H */