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/kmemcheck.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <linux/jhash.h>
24
25 #include <net/flow.h>
26 #include <net/sock.h>
27 #include <net/request_sock.h>
28 #include <net/netns/hash.h>
29
30 /** struct ip_options - IP Options
31 *
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
40 */
41 struct ip_options {
42 __be32 faddr;
43 unsigned char optlen;
44 unsigned char srr;
45 unsigned char rr;
46 unsigned char ts;
47 unsigned char 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 #endif
66 __be16 loc_port;
67 __be32 loc_addr;
68 __be32 rmt_addr;
69 __be16 rmt_port;
70 kmemcheck_bitfield_begin(flags);
71 u16 snd_wscale : 4,
72 rcv_wscale : 4,
73 tstamp_ok : 1,
74 sack_ok : 1,
75 wscale_ok : 1,
76 ecn_ok : 1,
77 acked : 1,
78 no_srccheck: 1;
79 kmemcheck_bitfield_end(flags);
80 struct ip_options *opt;
81 };
82
83 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
84 {
85 return (struct inet_request_sock *)sk;
86 }
87
88 struct ip_mc_socklist;
89 struct ipv6_pinfo;
90 struct rtable;
91
92 /** struct inet_sock - representation of INET sockets
93 *
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
99 * @num - Local port
100 * @saddr - Sending source
101 * @uc_ttl - Unicast TTL
102 * @sport - Source port
103 * @id - ID counter for DF pkts
104 * @tos - TOS
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
110 */
111 struct inet_sock {
112 /* sk and pinet6 has to be the first two members of inet_sock */
113 struct sock sk;
114 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
115 struct ipv6_pinfo *pinet6;
116 #endif
117 /* Socket demultiplex comparisons on incoming packets. */
118 __be32 daddr;
119 __be32 rcv_saddr;
120 __be16 dport;
121 __u16 num;
122 __be32 saddr;
123 __s16 uc_ttl;
124 __u16 cmsg_flags;
125 struct ip_options *opt;
126 __be16 sport;
127 __u16 id;
128 __u8 tos;
129 __u8 mc_ttl;
130 __u8 pmtudisc;
131 __u8 recverr:1,
132 is_icsk:1,
133 freebind:1,
134 hdrincl:1,
135 mc_loop:1,
136 transparent:1,
137 mc_all:1;
138 int mc_index;
139 __be32 mc_addr;
140 struct ip_mc_socklist *mc_list;
141 struct {
142 unsigned int flags;
143 unsigned int fragsize;
144 struct ip_options *opt;
145 struct dst_entry *dst;
146 int length; /* Total length of all frames */
147 __be32 addr;
148 struct flowi fl;
149 } cork;
150 };
151
152 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
153 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
154
155 static inline struct inet_sock *inet_sk(const struct sock *sk)
156 {
157 return (struct inet_sock *)sk;
158 }
159
160 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
161 const struct sock *sk_from,
162 const int ancestor_size)
163 {
164 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
165 sk_from->sk_prot->obj_size - ancestor_size);
166 }
167 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
168 static inline void inet_sk_copy_descendant(struct sock *sk_to,
169 const struct sock *sk_from)
170 {
171 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
172 }
173 #endif
174
175 extern int inet_sk_rebuild_header(struct sock *sk);
176
177 extern u32 inet_ehash_secret;
178 extern void build_ehash_secret(void);
179
180 static inline unsigned int inet_ehashfn(struct net *net,
181 const __be32 laddr, const __u16 lport,
182 const __be32 faddr, const __be16 fport)
183 {
184 return jhash_3words((__force __u32) laddr,
185 (__force __u32) faddr,
186 ((__u32) lport) << 16 | (__force __u32)fport,
187 inet_ehash_secret + net_hash_mix(net));
188 }
189
190 static inline int inet_sk_ehashfn(const struct sock *sk)
191 {
192 const struct inet_sock *inet = inet_sk(sk);
193 const __be32 laddr = inet->rcv_saddr;
194 const __u16 lport = inet->num;
195 const __be32 faddr = inet->daddr;
196 const __be16 fport = inet->dport;
197 struct net *net = sock_net(sk);
198
199 return inet_ehashfn(net, laddr, lport, faddr, fport);
200 }
201
202 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
203 {
204 struct request_sock *req = reqsk_alloc(ops);
205 struct inet_request_sock *ireq = inet_rsk(req);
206
207 if (req != NULL) {
208 kmemcheck_annotate_bitfield(ireq, flags);
209 ireq->opt = NULL;
210 }
211
212 return req;
213 }
214
215 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
216 {
217 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
218 }
219
220 #endif /* _INET_SOCK_H */
221
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