2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for inet_sock
8 * Authors: Many, reorganised here by
9 * Arnaldo Carvalho de Melo <acme@mandriva.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
20 #include <linux/string.h>
21 #include <linux/types.h>
22 #include <linux/jhash.h>
26 #include <net/request_sock.h>
27 #include <net/route.h>
29 /** struct ip_options - IP Options
31 * @faddr - Saved first hop address
32 * @is_data - Options in __data, rather than skb
33 * @is_strictroute - Strict source route
34 * @srr_is_hit - Packet destination addr was our one
35 * @is_changed - IP checksum more not valid
36 * @rr_needaddr - Need to record addr of outgoing dev
37 * @ts_needtime - Need to record timestamp
38 * @ts_needaddr - Need to record addr of outgoing dev
46 unsigned char is_strictroute
:1,
52 unsigned char router_alert
;
55 unsigned char __data
[0];
58 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
60 struct inet_request_sock
{
61 struct request_sock req
;
62 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
64 /* 2 bytes hole, try to pack */
76 struct ip_options
*opt
;
79 static inline struct inet_request_sock
*inet_rsk(const struct request_sock
*sk
)
81 return (struct inet_request_sock
*)sk
;
84 struct ip_mc_socklist
;
88 /** struct inet_sock - representation of INET sockets
90 * @sk - ancestor class
91 * @pinet6 - pointer to IPv6 control block
92 * @daddr - Foreign IPv4 addr
93 * @rcv_saddr - Bound local IPv4 addr
94 * @dport - Destination port
96 * @saddr - Sending source
97 * @uc_ttl - Unicast TTL
98 * @sport - Source port
99 * @id - ID counter for DF pkts
101 * @mc_ttl - Multicasting TTL
102 * @is_icsk - is this an inet_connection_sock?
103 * @mc_index - Multicast device index
104 * @mc_list - Group array
105 * @cork - info to build ip hdr on each ip frag while socket is corked
108 /* sk and pinet6 has to be the first two members of inet_sock */
110 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
111 struct ipv6_pinfo
*pinet6
;
113 /* Socket demultiplex comparisons on incoming packets. */
121 struct ip_options
*opt
;
134 struct ip_mc_socklist
*mc_list
;
137 unsigned int fragsize
;
138 struct ip_options
*opt
;
139 struct dst_entry
*dst
;
140 int length
; /* Total length of all frames */
146 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
147 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
149 static inline struct inet_sock
*inet_sk(const struct sock
*sk
)
151 return (struct inet_sock
*)sk
;
154 static inline void __inet_sk_copy_descendant(struct sock
*sk_to
,
155 const struct sock
*sk_from
,
156 const int ancestor_size
)
158 memcpy(inet_sk(sk_to
) + 1, inet_sk(sk_from
) + 1,
159 sk_from
->sk_prot
->obj_size
- ancestor_size
);
161 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
162 static inline void inet_sk_copy_descendant(struct sock
*sk_to
,
163 const struct sock
*sk_from
)
165 __inet_sk_copy_descendant(sk_to
, sk_from
, sizeof(struct inet_sock
));
169 extern int inet_sk_rebuild_header(struct sock
*sk
);
171 extern u32 inet_ehash_secret
;
172 extern void build_ehash_secret(void);
174 static inline unsigned int inet_ehashfn(const __be32 laddr
, const __u16 lport
,
175 const __be32 faddr
, const __be16 fport
)
177 return jhash_3words((__force __u32
) laddr
,
178 (__force __u32
) faddr
,
179 ((__u32
) lport
) << 16 | (__force __u32
)fport
,
183 static inline int inet_sk_ehashfn(const struct sock
*sk
)
185 const struct inet_sock
*inet
= inet_sk(sk
);
186 const __be32 laddr
= inet
->rcv_saddr
;
187 const __u16 lport
= inet
->num
;
188 const __be32 faddr
= inet
->daddr
;
189 const __be16 fport
= inet
->dport
;
191 return inet_ehashfn(laddr
, lport
, faddr
, fport
);
195 static inline int inet_iif(const struct sk_buff
*skb
)
197 return skb
->rtable
->rt_iif
;
200 static inline struct request_sock
*inet_reqsk_alloc(struct request_sock_ops
*ops
)
202 struct request_sock
*req
= reqsk_alloc(ops
);
205 inet_rsk(req
)->opt
= NULL
;
210 #endif /* _INET_SOCK_H */
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