Line data Source code
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 1 :
88 : struct ip_mc_socklist;
89 2 : 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 : * @inet_daddr - Foreign IPv4 addr
97 : * @inet_rcv_saddr - Bound local IPv4 addr
98 : * @inet_dport - Destination port
99 : * @inet_num - Local port
100 : * @inet_saddr - Sending source
101 : * @uc_ttl - Unicast TTL
102 : * @inet_sport - Source port
103 : * @inet_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 inet_daddr;
119 : __be32 inet_rcv_saddr;
120 : __be16 inet_dport;
121 : __u16 inet_num;
122 : __be32 inet_saddr;
123 : __s16 uc_ttl;
124 : __u16 cmsg_flags;
125 : struct ip_options *opt;
126 : __be16 inet_sport;
127 : __u16 inet_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->inet_rcv_saddr;
194 : const __u16 lport = inet->inet_num;
195 : const __be32 faddr = inet->inet_daddr;
196 : const __be16 fport = inet->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 1 :
220 1 : #endif /* _INET_SOCK_H */
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