tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_strictroute - Strict source route
36 * @srr_is_hit - Packet destination addr was our one
37 * @is_changed - IP checksum more not valid
38 * @rr_needaddr - Need to record addr of outgoing dev
39 * @ts_needtime - Need to record timestamp
40 * @ts_needaddr - Need to record addr of outgoing dev
41 */
42struct ip_options {
43 __be32 faddr;
44 __be32 nexthop;
45 unsigned char optlen;
46 unsigned char srr;
47 unsigned char rr;
48 unsigned char ts;
49 unsigned char is_strictroute:1,
50 srr_is_hit:1,
51 is_changed:1,
52 rr_needaddr:1,
53 ts_needtime:1,
54 ts_needaddr:1;
55 unsigned char router_alert;
56 unsigned char cipso;
57 unsigned char __pad2;
58 unsigned char __data[0];
59};
60
61struct ip_options_rcu {
62 struct rcu_head rcu;
63 struct ip_options opt;
64};
65
66struct ip_options_data {
67 struct ip_options_rcu opt;
68 char data[40];
69};
70
71struct inet_request_sock {
72 struct request_sock req;
73#define ir_loc_addr req.__req_common.skc_rcv_saddr
74#define ir_rmt_addr req.__req_common.skc_daddr
75#define ir_num req.__req_common.skc_num
76#define ir_rmt_port req.__req_common.skc_dport
77#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
78#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
79#define ir_iif req.__req_common.skc_bound_dev_if
80
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 union {
92 struct ip_options_rcu *opt;
93 struct sk_buff *pktopts;
94 };
95 u32 ir_mark;
96};
97
98static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
99{
100 return (struct inet_request_sock *)sk;
101}
102
103static inline u32 inet_request_mark(struct sock *sk, struct sk_buff *skb)
104{
105 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept) {
106 return skb->mark;
107 } else {
108 return sk->sk_mark;
109 }
110}
111
112struct inet_cork {
113 unsigned int flags;
114 __be32 addr;
115 struct ip_options *opt;
116 unsigned int fragsize;
117 int length; /* Total length of all frames */
118 struct dst_entry *dst;
119 u8 tx_flags;
120 __u8 ttl;
121 __s16 tos;
122 char priority;
123};
124
125struct inet_cork_full {
126 struct inet_cork base;
127 struct flowi fl;
128};
129
130struct ip_mc_socklist;
131struct ipv6_pinfo;
132struct rtable;
133
134/** struct inet_sock - representation of INET sockets
135 *
136 * @sk - ancestor class
137 * @pinet6 - pointer to IPv6 control block
138 * @inet_daddr - Foreign IPv4 addr
139 * @inet_rcv_saddr - Bound local IPv4 addr
140 * @inet_dport - Destination port
141 * @inet_num - Local port
142 * @inet_saddr - Sending source
143 * @uc_ttl - Unicast TTL
144 * @inet_sport - Source port
145 * @inet_id - ID counter for DF pkts
146 * @tos - TOS
147 * @mc_ttl - Multicasting TTL
148 * @is_icsk - is this an inet_connection_sock?
149 * @uc_index - Unicast outgoing device index
150 * @mc_index - Multicast device index
151 * @mc_list - Group array
152 * @cork - info to build ip hdr on each ip frag while socket is corked
153 */
154struct inet_sock {
155 /* sk and pinet6 has to be the first two members of inet_sock */
156 struct sock sk;
157#if IS_ENABLED(CONFIG_IPV6)
158 struct ipv6_pinfo *pinet6;
159#endif
160 /* Socket demultiplex comparisons on incoming packets. */
161#define inet_daddr sk.__sk_common.skc_daddr
162#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
163#define inet_dport sk.__sk_common.skc_dport
164#define inet_num sk.__sk_common.skc_num
165
166 __be32 inet_saddr;
167 __s16 uc_ttl;
168 __u16 cmsg_flags;
169 __be16 inet_sport;
170 __u16 inet_id;
171
172 struct ip_options_rcu __rcu *inet_opt;
173 int rx_dst_ifindex;
174 __u8 tos;
175 __u8 min_ttl;
176 __u8 mc_ttl;
177 __u8 pmtudisc;
178 __u8 recverr:1,
179 is_icsk:1,
180 freebind:1,
181 hdrincl:1,
182 mc_loop:1,
183 transparent:1,
184 mc_all:1,
185 nodefrag:1;
186 __u8 rcv_tos;
187 int uc_index;
188 int mc_index;
189 __be32 mc_addr;
190 struct ip_mc_socklist __rcu *mc_list;
191 struct inet_cork_full cork;
192};
193
194#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
195#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
196
197static inline struct inet_sock *inet_sk(const struct sock *sk)
198{
199 return (struct inet_sock *)sk;
200}
201
202static inline void __inet_sk_copy_descendant(struct sock *sk_to,
203 const struct sock *sk_from,
204 const int ancestor_size)
205{
206 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
207 sk_from->sk_prot->obj_size - ancestor_size);
208}
209#if !(IS_ENABLED(CONFIG_IPV6))
210static inline void inet_sk_copy_descendant(struct sock *sk_to,
211 const struct sock *sk_from)
212{
213 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
214}
215#endif
216
217int inet_sk_rebuild_header(struct sock *sk);
218
219static inline unsigned int __inet_ehashfn(const __be32 laddr,
220 const __u16 lport,
221 const __be32 faddr,
222 const __be16 fport,
223 u32 initval)
224{
225 return jhash_3words((__force __u32) laddr,
226 (__force __u32) faddr,
227 ((__u32) lport) << 16 | (__force __u32)fport,
228 initval);
229}
230
231static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
232{
233 struct request_sock *req = reqsk_alloc(ops);
234 struct inet_request_sock *ireq = inet_rsk(req);
235
236 if (req != NULL) {
237 kmemcheck_annotate_bitfield(ireq, flags);
238 ireq->opt = NULL;
239 }
240
241 return req;
242}
243
244static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
245{
246 __u8 flags = 0;
247
248 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
249 flags |= FLOWI_FLAG_ANYSRC;
250 return flags;
251}
252
253#endif /* _INET_SOCK_H */