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>
27 #include <net/request_sock.h>
28 #include <net/netns/hash.h>
30 /** struct ip_options - IP Options
32 * @faddr - Saved first hop address
33 * @is_data - Options in __data, rather than skb
34 * @is_strictroute - Strict source route
35 * @srr_is_hit - Packet destination addr was our one
36 * @is_changed - IP checksum more not valid
37 * @rr_needaddr - Need to record addr of outgoing dev
38 * @ts_needtime - Need to record timestamp
39 * @ts_needaddr - Need to record addr of outgoing dev
47 unsigned char is_strictroute:1,
53 unsigned char router_alert;
56 unsigned char __data[0];
59 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
61 struct inet_request_sock {
62 struct request_sock req;
63 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
70 kmemcheck_bitfield_begin(flags);
79 kmemcheck_bitfield_end(flags);
80 struct ip_options *opt;
83 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
85 return (struct inet_request_sock *)sk;
88 struct ip_mc_socklist;
92 /** struct inet_sock - representation of INET sockets
94 * @sk - ancestor class
95 * @pinet6 - pointer to IPv6 control block
96 * @daddr - Foreign IPv4 addr
97 * @rcv_saddr - Bound local IPv4 addr
98 * @dport - Destination port
100 * @saddr - Sending source
101 * @uc_ttl - Unicast TTL
102 * @sport - Source port
103 * @id - ID counter for DF pkts
105 * @mc_ttl - Multicasting TTL
106 * @is_icsk - is this an inet_connection_sock?
107 * @mc_index - Multicast device index
108 * @mc_list - Group array
109 * @cork - info to build ip hdr on each ip frag while socket is corked
112 /* sk and pinet6 has to be the first two members of inet_sock */
114 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
115 struct ipv6_pinfo *pinet6;
117 /* Socket demultiplex comparisons on incoming packets. */
125 struct ip_options *opt;
139 struct ip_mc_socklist *mc_list;
142 unsigned int fragsize;
143 struct ip_options *opt;
144 struct dst_entry *dst;
145 int length; /* Total length of all frames */
151 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
152 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
154 static inline struct inet_sock *inet_sk(const struct sock *sk)
156 return (struct inet_sock *)sk;
159 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
160 const struct sock *sk_from,
161 const int ancestor_size)
163 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
164 sk_from->sk_prot->obj_size - ancestor_size);
166 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
167 static inline void inet_sk_copy_descendant(struct sock *sk_to,
168 const struct sock *sk_from)
170 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
174 extern int inet_sk_rebuild_header(struct sock *sk);
176 extern u32 inet_ehash_secret;
177 extern void build_ehash_secret(void);
179 static inline unsigned int inet_ehashfn(struct net *net,
180 const __be32 laddr, const __u16 lport,
181 const __be32 faddr, const __be16 fport)
183 return jhash_3words((__force __u32) laddr,
184 (__force __u32) faddr,
185 ((__u32) lport) << 16 | (__force __u32)fport,
186 inet_ehash_secret + net_hash_mix(net));
189 static inline int inet_sk_ehashfn(const struct sock *sk)
191 const struct inet_sock *inet = inet_sk(sk);
192 const __be32 laddr = inet->rcv_saddr;
193 const __u16 lport = inet->num;
194 const __be32 faddr = inet->daddr;
195 const __be16 fport = inet->dport;
196 struct net *net = sock_net(sk);
198 return inet_ehashfn(net, laddr, lport, faddr, fport);
201 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
203 struct request_sock *req = reqsk_alloc(ops);
204 struct inet_request_sock *ireq = inet_rsk(req);
207 kmemcheck_annotate_bitfield(ireq, flags);
214 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
216 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
219 #endif /* _INET_SOCK_H */