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/kmemcheck.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <linux/jhash.h>
24 #include <linux/netdevice.h>
28 #include <net/request_sock.h>
29 #include <net/netns/hash.h>
31 /** struct ip_options - IP Options
33 * @faddr - Saved first hop address
34 * @nexthop - Saved nexthop address in LSRR and SSRR
35 * @is_data - Options in __data, rather than skb
36 * @is_strictroute - Strict source route
37 * @srr_is_hit - Packet destination addr was our one
38 * @is_changed - IP checksum more not valid
39 * @rr_needaddr - Need to record addr of outgoing dev
40 * @ts_needtime - Need to record timestamp
41 * @ts_needaddr - Need to record addr of outgoing dev
50 unsigned char is_strictroute
:1,
56 unsigned char router_alert
;
59 unsigned char __data
[0];
62 struct ip_options_rcu
{
64 struct ip_options opt
;
67 struct ip_options_data
{
68 struct ip_options_rcu opt
;
72 struct inet_request_sock
{
73 struct request_sock req
;
74 #if IS_ENABLED(CONFIG_IPV6)
81 kmemcheck_bitfield_begin(flags
);
90 kmemcheck_bitfield_end(flags
);
92 struct ip_options_rcu
*opt
;
95 static inline struct inet_request_sock
*inet_rsk(const struct request_sock
*sk
)
97 return (struct inet_request_sock
*)sk
;
100 static inline u32
inet_request_mark(struct sock
*sk
, struct sk_buff
*skb
)
102 if (!sk
->sk_mark
&& sock_net(sk
)->ipv4
.sysctl_tcp_fwmark_accept
)
111 struct ip_options
*opt
;
112 unsigned int fragsize
;
113 int length
; /* Total length of all frames */
114 struct dst_entry
*dst
;
118 struct inet_cork_full
{
119 struct inet_cork base
;
123 struct ip_mc_socklist
;
127 /** struct inet_sock - representation of INET sockets
129 * @sk - ancestor class
130 * @pinet6 - pointer to IPv6 control block
131 * @inet_daddr - Foreign IPv4 addr
132 * @inet_rcv_saddr - Bound local IPv4 addr
133 * @inet_dport - Destination port
134 * @inet_num - Local port
135 * @inet_saddr - Sending source
136 * @uc_ttl - Unicast TTL
137 * @inet_sport - Source port
138 * @inet_id - ID counter for DF pkts
140 * @mc_ttl - Multicasting TTL
141 * @is_icsk - is this an inet_connection_sock?
142 * @uc_index - Unicast outgoing device index
143 * @mc_index - Multicast device index
144 * @mc_list - Group array
145 * @cork - info to build ip hdr on each ip frag while socket is corked
148 /* sk and pinet6 has to be the first two members of inet_sock */
150 #if IS_ENABLED(CONFIG_IPV6)
151 struct ipv6_pinfo
*pinet6
;
153 /* Socket demultiplex comparisons on incoming packets. */
154 #define inet_daddr sk.__sk_common.skc_daddr
155 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
156 #define inet_addrpair sk.__sk_common.skc_addrpair
157 #define inet_dport sk.__sk_common.skc_dport
158 #define inet_num sk.__sk_common.skc_num
159 #define inet_portpair sk.__sk_common.skc_portpair
167 struct ip_options_rcu __rcu
*inet_opt
;
185 struct ip_mc_socklist __rcu
*mc_list
;
186 struct inet_cork_full cork
;
189 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
190 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
192 static inline struct inet_sock
*inet_sk(const struct sock
*sk
)
194 return (struct inet_sock
*)sk
;
197 static inline void __inet_sk_copy_descendant(struct sock
*sk_to
,
198 const struct sock
*sk_from
,
199 const int ancestor_size
)
201 memcpy(inet_sk(sk_to
) + 1, inet_sk(sk_from
) + 1,
202 sk_from
->sk_prot
->obj_size
- ancestor_size
);
204 #if !(IS_ENABLED(CONFIG_IPV6))
205 static inline void inet_sk_copy_descendant(struct sock
*sk_to
,
206 const struct sock
*sk_from
)
208 __inet_sk_copy_descendant(sk_to
, sk_from
, sizeof(struct inet_sock
));
212 extern int inet_sk_rebuild_header(struct sock
*sk
);
214 extern u32 inet_ehash_secret
;
215 extern u32 ipv6_hash_secret
;
216 extern void build_ehash_secret(void);
218 static inline unsigned int inet_ehashfn(struct net
*net
,
219 const __be32 laddr
, const __u16 lport
,
220 const __be32 faddr
, const __be16 fport
)
222 return jhash_3words((__force __u32
) laddr
,
223 (__force __u32
) faddr
,
224 ((__u32
) lport
) << 16 | (__force __u32
)fport
,
225 inet_ehash_secret
+ net_hash_mix(net
));
228 static inline int inet_sk_ehashfn(const struct sock
*sk
)
230 const struct inet_sock
*inet
= inet_sk(sk
);
231 const __be32 laddr
= inet
->inet_rcv_saddr
;
232 const __u16 lport
= inet
->inet_num
;
233 const __be32 faddr
= inet
->inet_daddr
;
234 const __be16 fport
= inet
->inet_dport
;
235 struct net
*net
= sock_net(sk
);
237 return inet_ehashfn(net
, laddr
, lport
, faddr
, fport
);
240 static inline struct request_sock
*inet_reqsk_alloc(struct request_sock_ops
*ops
)
242 struct request_sock
*req
= reqsk_alloc(ops
);
243 struct inet_request_sock
*ireq
= inet_rsk(req
);
246 kmemcheck_annotate_bitfield(ireq
, flags
);
253 static inline __u8
inet_sk_flowi_flags(const struct sock
*sk
)
257 if (inet_sk(sk
)->transparent
|| inet_sk(sk
)->hdrincl
)
258 flags
|= FLOWI_FLAG_ANYSRC
;
262 #endif /* _INET_SOCK_H */