Release 4.7 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/kmemcheck.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

	kmemcheck_bitfield_begin(flags);
	
u16			snd_wscale : 4,
				
rcv_wscale : 4,
				
tstamp_ok  : 1,
				
sack_ok	   : 1,
				
wscale_ok  : 1,
				
ecn_ok	   : 1,
				
acked	   : 1,
				
no_srccheck: 1;
	kmemcheck_bitfield_end(flags);
	
u32                     ir_mark;
	union {
		
struct ip_options_rcu	*opt;
		
struct sk_buff		*pktopts;
	};
};



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

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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;
}

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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;
}

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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;
};


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;
	
__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)

/**
 * 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;
}

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/* 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;
}

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

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

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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);
}
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#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));
}
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#endif

int inet_sk_rebuild_header(struct sock *sk);



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);
}

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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;
}

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

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

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

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#endif	/* _INET_SOCK_H */
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