1 /*
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.
5 *
6 * Definitions for inet_sock
7 *
8 * Authors: Many, reorganised here by
9 * Arnaldo Carvalho de Melo <acme@mandriva.com>
10 *
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.
15 */
16 #ifndef _INET_SOCK_H
17 #define _INET_SOCK_H
18
19
20 #include <linux/string.h>
21 #include <linux/types.h>
22 #include <linux/jhash.h>
23
24 #include <net/flow.h>
25 #include <net/sock.h>
26 #include <net/request_sock.h>
27 #include <net/route.h>
28
29 /** struct ip_options - IP Options
30 *
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
39 */
40 struct ip_options {
41 __be32 faddr;
42 unsigned char optlen;
43 unsigned char srr;
44 unsigned char rr;
45 unsigned char ts;
46 unsigned char is_data:1,
47 is_strictroute:1,
48 srr_is_hit:1,
49 is_changed:1,
50 rr_needaddr:1,
51 ts_needtime:1,
52 ts_needaddr:1;
53 unsigned char router_alert;
54 unsigned char cipso;
55 unsigned char __pad2;
56 unsigned char __data[0];
57 };
58
59 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
60
61 struct inet_request_sock {
62 struct request_sock req;
63 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
64 u16 inet6_rsk_offset;
65 /* 2 bytes hole, try to pack */
66 #endif
67 __be32 loc_addr;
68 __be32 rmt_addr;
69 __be16 rmt_port;
70 u16 snd_wscale : 4,
71 rcv_wscale : 4,
72 tstamp_ok : 1,
73 sack_ok : 1,
74 wscale_ok : 1,
75 ecn_ok : 1,
76 acked : 1;
77 struct ip_options *opt;
78 };
79
80 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
81 {
82 return (struct inet_request_sock *)sk;
83 }
84
85 struct ip_mc_socklist;
86 struct ipv6_pinfo;
87 struct rtable;
88
89 /** struct inet_sock - representation of INET sockets
90 *
91 * @sk - ancestor class
92 * @pinet6 - pointer to IPv6 control block
93 * @daddr - Foreign IPv4 addr
94 * @rcv_saddr - Bound local IPv4 addr
95 * @dport - Destination port
96 * @num - Local port
97 * @saddr - Sending source
98 * @uc_ttl - Unicast TTL
99 * @sport - Source port
100 * @id - ID counter for DF pkts
101 * @tos - TOS
102 * @mc_ttl - Multicasting TTL
103 * @is_icsk - is this an inet_connection_sock?
104 * @mc_index - Multicast device index
105 * @mc_list - Group array
106 * @cork - info to build ip hdr on each ip frag while socket is corked
107 */
108 struct inet_sock {
109 /* sk and pinet6 has to be the first two members of inet_sock */
110 struct sock sk;
111 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
112 struct ipv6_pinfo *pinet6;
113 #endif
114 /* Socket demultiplex comparisons on incoming packets. */
115 __be32 daddr;
116 __be32 rcv_saddr;
117 __be16 dport;
118 __u16 num;
119 __be32 saddr;
120 __s16 uc_ttl;
121 __u16 cmsg_flags;
122 struct ip_options *opt;
123 __be16 sport;
124 __u16 id;
125 __u8 tos;
126 __u8 mc_ttl;
127 __u8 pmtudisc;
128 __u8 recverr:1,
129 is_icsk:1,
130 freebind:1,
131 hdrincl:1,
132 mc_loop:1;
133 int mc_index;
134 __be32 mc_addr;
135 struct ip_mc_socklist *mc_list;
136 struct {
137 unsigned int flags;
138 unsigned int fragsize;
139 struct ip_options *opt;
140 struct rtable *rt;
141 int length; /* Total length of all frames */
142 __be32 addr;
143 struct flowi fl;
144 } cork;
145 };
146
147 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
148 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
149
150 static inline struct inet_sock *inet_sk(const struct sock *sk)
151 {
152 return (struct inet_sock *)sk;
153 }
154
155 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
156 const struct sock *sk_from,
157 const int ancestor_size)
158 {
159 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
160 sk_from->sk_prot->obj_size - ancestor_size);
161 }
162 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
163 static inline void inet_sk_copy_descendant(struct sock *sk_to,
164 const struct sock *sk_from)
165 {
166 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
167 }
168 #endif
169
170 extern int inet_sk_rebuild_header(struct sock *sk);
171
172 extern u32 inet_ehash_secret;
173 extern void build_ehash_secret(void);
174
175 static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
176 const __be32 faddr, const __be16 fport)
177 {
178 return jhash_3words((__force __u32) laddr,
179 (__force __u32) faddr,
180 ((__u32) lport) << 16 | (__force __u32)fport,
181 inet_ehash_secret);
182 }
183
184 static inline int inet_sk_ehashfn(const struct sock *sk)
185 {
186 const struct inet_sock *inet = inet_sk(sk);
187 const __be32 laddr = inet->rcv_saddr;
188 const __u16 lport = inet->num;
189 const __be32 faddr = inet->daddr;
190 const __be16 fport = inet->dport;
191
192 return inet_ehashfn(laddr, lport, faddr, fport);
193 }
194
195
196 static inline int inet_iif(const struct sk_buff *skb)
197 {
198 return ((struct rtable *)skb->dst)->rt_iif;
199 }
200
201 #endif /* _INET_SOCK_H */
202
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