/* * 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/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> /** struct ip_options - IP Options * * @faddr - Saved first hop address * @nexthop - Saved nexthop address in LSRR and SSRR * @is_data - Options in __data, rather than skb * @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;#if IS_ENABLED(CONFIG_IPV6)	u16			inet6_rsk_offset;#endif	__be16			loc_port;	__be32			loc_addr;	__be32			rmt_addr;	__be16			rmt_port;	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);	struct ip_options_rcu	*opt;}; static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk){	return (struct inet_request_sock *)sk;} struct inet_cork {	unsigned int		flags;	__be32			addr;	struct ip_options	*opt;	unsigned int		fragsize;	struct dst_entry	*dst;	int			length; /* Total length of all frames */	struct page		*page;	u32			off;	u8			tx_flags;}; 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 	__be16			inet_dport;	__u16			inet_num;	__be32			inet_saddr;	__s16			uc_ttl;	__u16			cmsg_flags;	__be16			inet_sport;	__u16			inet_id; 	struct ip_options_rcu __rcu	*inet_opt;	__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			rcv_tos;	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) */ 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 extern int inet_sk_rebuild_header(struct sock *sk); extern u32 inet_ehash_secret;extern void build_ehash_secret(void); static inline unsigned int inet_ehashfn(struct net *net,					const __be32 laddr, const __u16 lport,					const __be32 faddr, const __be16 fport){	return jhash_3words((__force __u32) laddr,			    (__force __u32) faddr,			    ((__u32) lport) << 16 | (__force __u32)fport,			    inet_ehash_secret + net_hash_mix(net));} static inline int inet_sk_ehashfn(const struct sock *sk){	const struct inet_sock *inet = inet_sk(sk);	const __be32 laddr = inet->inet_rcv_saddr;	const __u16 lport = inet->inet_num;	const __be32 faddr = inet->inet_daddr;	const __be16 fport = inet->inet_dport;	struct net *net = sock_net(sk); 	return inet_ehashfn(net, laddr, lport, faddr, fport);} static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops){	struct request_sock *req = reqsk_alloc(ops);	struct inet_request_sock *ireq = inet_rsk(req); 	if (req != NULL) {		kmemcheck_annotate_bitfield(ireq, flags);		ireq->opt = NULL;	} 	return req;} 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;	if (sk->sk_protocol == IPPROTO_TCP)		flags |= FLOWI_FLAG_PRECOW_METRICS;	return flags;} #endif	/* _INET_SOCK_H */