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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#include <linux/netdevice.h>
25
26#include <net/flow.h>
27#include <net/sock.h>
28#include <net/request_sock.h>
29#include <net/netns/hash.h>
30
31/** struct ip_options - IP Options
32 *
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
42 */
43struct ip_options {
44 __be32 faddr;
45 __be32 nexthop;
46 unsigned char optlen;
47 unsigned char srr;
48 unsigned char rr;
49 unsigned char ts;
50 unsigned char is_strictroute:1,
51 srr_is_hit:1,
52 is_changed:1,
53 rr_needaddr:1,
54 ts_needtime:1,
55 ts_needaddr:1;
56 unsigned char router_alert;
57 unsigned char cipso;
58 unsigned char __pad2;
59 unsigned char __data[0];
60};
61
62struct ip_options_rcu {
63 struct rcu_head rcu;
64 struct ip_options opt;
65};
66
67struct ip_options_data {
68 struct ip_options_rcu opt;
69 char data[40];
70};
71
72struct inet_request_sock {
73 struct request_sock req;
74#if IS_ENABLED(CONFIG_IPV6)
75 u16 inet6_rsk_offset;
76#endif
77 __be16 loc_port;
78 __be32 loc_addr;
79 __be32 rmt_addr;
80 __be16 rmt_port;
81 kmemcheck_bitfield_begin(flags);
82 u16 snd_wscale : 4,
83 rcv_wscale : 4,
84 tstamp_ok : 1,
85 sack_ok : 1,
86 wscale_ok : 1,
87 ecn_ok : 1,
88 acked : 1,
89 no_srccheck: 1;
90 kmemcheck_bitfield_end(flags);
91 struct ip_options_rcu *opt;
92};
93
94static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
95{
96 return (struct inet_request_sock *)sk;
97}
98
99struct inet_cork {
100 unsigned int flags;
101 __be32 addr;
102 struct ip_options *opt;
103 unsigned int fragsize;
104 struct dst_entry *dst;
105 int length; /* Total length of all frames */
106 struct page *page;
107 u32 off;
108 u8 tx_flags;
109};
110
111struct inet_cork_full {
112 struct inet_cork base;
113 struct flowi fl;
114};
115
116struct ip_mc_socklist;
117struct ipv6_pinfo;
118struct rtable;
119
120/** struct inet_sock - representation of INET sockets
121 *
122 * @sk - ancestor class
123 * @pinet6 - pointer to IPv6 control block
124 * @inet_daddr - Foreign IPv4 addr
125 * @inet_rcv_saddr - Bound local IPv4 addr
126 * @inet_dport - Destination port
127 * @inet_num - Local port
128 * @inet_saddr - Sending source
129 * @uc_ttl - Unicast TTL
130 * @inet_sport - Source port
131 * @inet_id - ID counter for DF pkts
132 * @tos - TOS
133 * @mc_ttl - Multicasting TTL
134 * @is_icsk - is this an inet_connection_sock?
135 * @uc_index - Unicast outgoing device index
136 * @mc_index - Multicast device index
137 * @mc_list - Group array
138 * @cork - info to build ip hdr on each ip frag while socket is corked
139 */
140struct inet_sock {
141 /* sk and pinet6 has to be the first two members of inet_sock */
142 struct sock sk;
143#if IS_ENABLED(CONFIG_IPV6)
144 struct ipv6_pinfo *pinet6;
145#endif
146 /* Socket demultiplex comparisons on incoming packets. */
147#define inet_daddr sk.__sk_common.skc_daddr
148#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
149
150 __be16 inet_dport;
151 __u16 inet_num;
152 __be32 inet_saddr;
153 __s16 uc_ttl;
154 __u16 cmsg_flags;
155 __be16 inet_sport;
156 __u16 inet_id;
157
158 struct ip_options_rcu __rcu *inet_opt;
159 __u8 tos;
160 __u8 min_ttl;
161 __u8 mc_ttl;
162 __u8 pmtudisc;
163 __u8 recverr:1,
164 is_icsk:1,
165 freebind:1,
166 hdrincl:1,
167 mc_loop:1,
168 transparent:1,
169 mc_all:1,
170 nodefrag:1;
171 __u8 rcv_tos;
172 int uc_index;
173 int mc_index;
174 __be32 mc_addr;
175 struct ip_mc_socklist __rcu *mc_list;
176 struct inet_cork_full cork;
177};
178
179#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
180#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
181
182static inline struct inet_sock *inet_sk(const struct sock *sk)
183{
184 return (struct inet_sock *)sk;
185}
186
187static inline void __inet_sk_copy_descendant(struct sock *sk_to,
188 const struct sock *sk_from,
189 const int ancestor_size)
190{
191 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
192 sk_from->sk_prot->obj_size - ancestor_size);
193}
194#if !(IS_ENABLED(CONFIG_IPV6))
195static inline void inet_sk_copy_descendant(struct sock *sk_to,
196 const struct sock *sk_from)
197{
198 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
199}
200#endif
201
202extern int inet_sk_rebuild_header(struct sock *sk);
203
204extern u32 inet_ehash_secret;
205extern void build_ehash_secret(void);
206
207static inline unsigned int inet_ehashfn(struct net *net,
208 const __be32 laddr, const __u16 lport,
209 const __be32 faddr, const __be16 fport)
210{
211 return jhash_3words((__force __u32) laddr,
212 (__force __u32) faddr,
213 ((__u32) lport) << 16 | (__force __u32)fport,
214 inet_ehash_secret + net_hash_mix(net));
215}
216
217static inline int inet_sk_ehashfn(const struct sock *sk)
218{
219 const struct inet_sock *inet = inet_sk(sk);
220 const __be32 laddr = inet->inet_rcv_saddr;
221 const __u16 lport = inet->inet_num;
222 const __be32 faddr = inet->inet_daddr;
223 const __be16 fport = inet->inet_dport;
224 struct net *net = sock_net(sk);
225
226 return inet_ehashfn(net, laddr, lport, faddr, fport);
227}
228
229static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
230{
231 struct request_sock *req = reqsk_alloc(ops);
232 struct inet_request_sock *ireq = inet_rsk(req);
233
234 if (req != NULL) {
235 kmemcheck_annotate_bitfield(ireq, flags);
236 ireq->opt = NULL;
237 }
238
239 return req;
240}
241
242static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
243{
244 __u8 flags = 0;
245
246 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
247 flags |= FLOWI_FLAG_ANYSRC;
248 if (sk->sk_protocol == IPPROTO_TCP)
249 flags |= FLOWI_FLAG_PRECOW_METRICS;
250 return flags;
251}
252
253#endif /* _INET_SOCK_H */