inet_sock.h 6.15 KB
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/*
 * 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


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#include <linux/kmemcheck.h>
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#include <linux/string.h>
#include <linux/types.h>
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#include <linux/jhash.h>
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#include <linux/netdevice.h>
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#include <net/flow.h>
#include <net/sock.h>
#include <net/request_sock.h>
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#include <net/netns/hash.h>
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/** struct ip_options - IP Options
 *
 * @faddr - Saved first hop address
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 * @nexthop - Saved nexthop address in LSRR and SSRR
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 * @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 {
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	__be32		faddr;
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	__be32		nexthop;
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	unsigned char	optlen;
	unsigned char	srr;
	unsigned char	rr;
	unsigned char	ts;
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	unsigned char	is_strictroute:1,
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			srr_is_hit:1,
			is_changed:1,
			rr_needaddr:1,
			ts_needtime:1,
			ts_needaddr:1;
	unsigned char	router_alert;
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	unsigned char	cipso;
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	unsigned char	__pad2;
	unsigned char	__data[0];
};

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

struct ip_options_data {
	struct ip_options_rcu	opt;
	char			data[40];
};
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struct inet_request_sock {
	struct request_sock	req;
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#if IS_ENABLED(CONFIG_IPV6)
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	u16			inet6_rsk_offset;
#endif
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	__be16			loc_port;
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	__be32			loc_addr;
	__be32			rmt_addr;
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	__be16			rmt_port;
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	kmemcheck_bitfield_begin(flags);
	u16			snd_wscale : 4,
				rcv_wscale : 4,
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				tstamp_ok  : 1,
				sack_ok	   : 1,
				wscale_ok  : 1,
				ecn_ok	   : 1,
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				acked	   : 1,
				no_srccheck: 1;
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	kmemcheck_bitfield_end(flags);
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	struct ip_options_rcu	*opt;
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};

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

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struct inet_cork {
	unsigned int		flags;
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	__be32			addr;
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	struct ip_options	*opt;
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	unsigned int		fragsize;
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	struct dst_entry	*dst;
	int			length; /* Total length of all frames */
	struct page		*page;
	u32			off;
	u8			tx_flags;
};

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

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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
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 * @inet_daddr - Foreign IPv4 addr
 * @inet_rcv_saddr - Bound local IPv4 addr
 * @inet_dport - Destination port
 * @inet_num - Local port
 * @inet_saddr - Sending source
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 * @uc_ttl - Unicast TTL
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 * @inet_sport - Source port
 * @inet_id - ID counter for DF pkts
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 * @tos - TOS
 * @mc_ttl - Multicasting TTL
 * @is_icsk - is this an inet_connection_sock?
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 * @uc_index - Unicast outgoing device index
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 * @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;
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#if IS_ENABLED(CONFIG_IPV6)
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	struct ipv6_pinfo	*pinet6;
#endif
	/* Socket demultiplex comparisons on incoming packets. */
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#define inet_daddr		sk.__sk_common.skc_daddr
#define inet_rcv_saddr		sk.__sk_common.skc_rcv_saddr

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	__be16			inet_dport;
	__u16			inet_num;
	__be32			inet_saddr;
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	__s16			uc_ttl;
	__u16			cmsg_flags;
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	__be16			inet_sport;
	__u16			inet_id;
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	struct ip_options_rcu __rcu	*inet_opt;
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	__u8			tos;
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	__u8			min_ttl;
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	__u8			mc_ttl;
	__u8			pmtudisc;
	__u8			recverr:1,
				is_icsk:1,
				freebind:1,
				hdrincl:1,
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				mc_loop:1,
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				transparent:1,
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				mc_all:1,
				nodefrag:1;
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	__u8			rcv_tos;
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	int			uc_index;
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	int			mc_index;
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	__be32			mc_addr;
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	int			rx_dst_ifindex;
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	struct ip_mc_socklist __rcu	*mc_list;
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	struct inet_cork_full	cork;
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};

#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);
}
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#if !(IS_ENABLED(CONFIG_IPV6))
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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);

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extern u32 inet_ehash_secret;
extern void build_ehash_secret(void);

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static inline unsigned int inet_ehashfn(struct net *net,
					const __be32 laddr, const __u16 lport,
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					const __be32 faddr, const __be16 fport)
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{
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	return jhash_3words((__force __u32) laddr,
			    (__force __u32) faddr,
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			    ((__u32) lport) << 16 | (__force __u32)fport,
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			    inet_ehash_secret + net_hash_mix(net));
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}

static inline int inet_sk_ehashfn(const struct sock *sk)
{
	const struct inet_sock *inet = inet_sk(sk);
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	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;
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	struct net *net = sock_net(sk);
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	return inet_ehashfn(net, laddr, lport, faddr, fport);
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}

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static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
{
	struct request_sock *req = reqsk_alloc(ops);
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	struct inet_request_sock *ireq = inet_rsk(req);
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	if (req != NULL) {
		kmemcheck_annotate_bitfield(ireq, flags);
		ireq->opt = NULL;
	}
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	return req;
}

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

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

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#endif	/* _INET_SOCK_H */