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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 * @is_data - Options in __data, rather than skb
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 unsigned char optlen;
45 unsigned char srr;
46 unsigned char rr;
47 unsigned char ts;
48 unsigned char is_strictroute:1,
49 srr_is_hit:1,
50 is_changed:1,
51 rr_needaddr:1,
52 ts_needtime:1,
53 ts_needaddr:1;
54 unsigned char router_alert;
55 unsigned char cipso;
56 unsigned char __pad2;
57 unsigned char __data[0];
58};
59
60struct ip_options_rcu {
61 struct rcu_head rcu;
62 struct ip_options opt;
63};
64
65struct ip_options_data {
66 struct ip_options_rcu opt;
67 char data[40];
68};
69
70struct inet_request_sock {
71 struct request_sock req;
72#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
73 u16 inet6_rsk_offset;
74#endif
75 __be16 loc_port;
76 __be32 loc_addr;
77 __be32 rmt_addr;
78 __be16 rmt_port;
79 kmemcheck_bitfield_begin(flags);
80 u16 snd_wscale : 4,
81 rcv_wscale : 4,
82 tstamp_ok : 1,
83 sack_ok : 1,
84 wscale_ok : 1,
85 ecn_ok : 1,
86 acked : 1,
87 no_srccheck: 1;
88 kmemcheck_bitfield_end(flags);
89 struct ip_options_rcu *opt;
90};
91
92static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
93{
94 return (struct inet_request_sock *)sk;
95}
96
97struct inet_cork {
98 unsigned int flags;
99 __be32 addr;
100 struct ip_options *opt;
101 unsigned int fragsize;
102 struct dst_entry *dst;
103 int length; /* Total length of all frames */
104 struct page *page;
105 u32 off;
106 u8 tx_flags;
107};
108
109struct inet_cork_full {
110 struct inet_cork base;
111 struct flowi fl;
112};
113
114struct ip_mc_socklist;
115struct ipv6_pinfo;
116struct rtable;
117
118/** struct inet_sock - representation of INET sockets
119 *
120 * @sk - ancestor class
121 * @pinet6 - pointer to IPv6 control block
122 * @inet_daddr - Foreign IPv4 addr
123 * @inet_rcv_saddr - Bound local IPv4 addr
124 * @inet_dport - Destination port
125 * @inet_num - Local port
126 * @inet_saddr - Sending source
127 * @uc_ttl - Unicast TTL
128 * @inet_sport - Source port
129 * @inet_id - ID counter for DF pkts
130 * @tos - TOS
131 * @mc_ttl - Multicasting TTL
132 * @is_icsk - is this an inet_connection_sock?
133 * @mc_index - Multicast device index
134 * @mc_list - Group array
135 * @cork - info to build ip hdr on each ip frag while socket is corked
136 */
137struct inet_sock {
138 /* sk and pinet6 has to be the first two members of inet_sock */
139 struct sock sk;
140#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
141 struct ipv6_pinfo *pinet6;
142#endif
143 /* Socket demultiplex comparisons on incoming packets. */
144#define inet_daddr sk.__sk_common.skc_daddr
145#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
146
147 __be16 inet_dport;
148 __u16 inet_num;
149 __be32 inet_saddr;
150 __s16 uc_ttl;
151 __u16 cmsg_flags;
152 __be16 inet_sport;
153 __u16 inet_id;
154
155 struct ip_options_rcu __rcu *inet_opt;
156 __u8 tos;
157 __u8 min_ttl;
158 __u8 mc_ttl;
159 __u8 pmtudisc;
160 __u8 recverr:1,
161 is_icsk:1,
162 freebind:1,
163 hdrincl:1,
164 mc_loop:1,
165 transparent:1,
166 mc_all:1,
167 nodefrag:1;
168 int mc_index;
169 __be32 mc_addr;
170 struct ip_mc_socklist __rcu *mc_list;
171 struct inet_cork_full cork;
172};
173
174#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
175#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
176
177static inline struct inet_sock *inet_sk(const struct sock *sk)
178{
179 return (struct inet_sock *)sk;
180}
181
182static inline void __inet_sk_copy_descendant(struct sock *sk_to,
183 const struct sock *sk_from,
184 const int ancestor_size)
185{
186 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
187 sk_from->sk_prot->obj_size - ancestor_size);
188}
189#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
190static inline void inet_sk_copy_descendant(struct sock *sk_to,
191 const struct sock *sk_from)
192{
193 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
194}
195#endif
196
197extern int inet_sk_rebuild_header(struct sock *sk);
198
199extern u32 inet_ehash_secret;
200extern void build_ehash_secret(void);
201
202static inline unsigned int inet_ehashfn(struct net *net,
203 const __be32 laddr, const __u16 lport,
204 const __be32 faddr, const __be16 fport)
205{
206 return jhash_3words((__force __u32) laddr,
207 (__force __u32) faddr,
208 ((__u32) lport) << 16 | (__force __u32)fport,
209 inet_ehash_secret + net_hash_mix(net));
210}
211
212static inline int inet_sk_ehashfn(const struct sock *sk)
213{
214 const struct inet_sock *inet = inet_sk(sk);
215 const __be32 laddr = inet->inet_rcv_saddr;
216 const __u16 lport = inet->inet_num;
217 const __be32 faddr = inet->inet_daddr;
218 const __be16 fport = inet->inet_dport;
219 struct net *net = sock_net(sk);
220
221 return inet_ehashfn(net, laddr, lport, faddr, fport);
222}
223
224static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
225{
226 struct request_sock *req = reqsk_alloc(ops);
227 struct inet_request_sock *ireq = inet_rsk(req);
228
229 if (req != NULL) {
230 kmemcheck_annotate_bitfield(ireq, flags);
231 ireq->opt = NULL;
232 }
233
234 return req;
235}
236
237static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
238{
239 __u8 flags = 0;
240
241 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
242 flags |= FLOWI_FLAG_ANYSRC;
243 if (sk->sk_protocol == IPPROTO_TCP)
244 flags |= FLOWI_FLAG_PRECOW_METRICS;
245 return flags;
246}
247
248#endif /* _INET_SOCK_H */
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#include <linux/bitops.h>
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#include <net/tcp_states.h>
31#include <net/l3mdev.h>
32
33/** struct ip_options - IP Options
34 *
35 * @faddr - Saved first hop address
36 * @nexthop - Saved nexthop address in LSRR and SSRR
37 * @is_strictroute - Strict source route
38 * @srr_is_hit - Packet destination addr was our one
39 * @is_changed - IP checksum more not valid
40 * @rr_needaddr - Need to record addr of outgoing dev
41 * @ts_needtime - Need to record timestamp
42 * @ts_needaddr - Need to record addr of outgoing dev
43 */
44struct ip_options {
45 __be32 faddr;
46 __be32 nexthop;
47 unsigned char optlen;
48 unsigned char srr;
49 unsigned char rr;
50 unsigned char ts;
51 unsigned char is_strictroute:1,
52 srr_is_hit:1,
53 is_changed:1,
54 rr_needaddr:1,
55 ts_needtime:1,
56 ts_needaddr:1;
57 unsigned char router_alert;
58 unsigned char cipso;
59 unsigned char __pad2;
60 unsigned char __data[0];
61};
62
63struct ip_options_rcu {
64 struct rcu_head rcu;
65 struct ip_options opt;
66};
67
68struct ip_options_data {
69 struct ip_options_rcu opt;
70 char data[40];
71};
72
73struct inet_request_sock {
74 struct request_sock req;
75#define ir_loc_addr req.__req_common.skc_rcv_saddr
76#define ir_rmt_addr req.__req_common.skc_daddr
77#define ir_num req.__req_common.skc_num
78#define ir_rmt_port req.__req_common.skc_dport
79#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
80#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
81#define ir_iif req.__req_common.skc_bound_dev_if
82#define ir_cookie req.__req_common.skc_cookie
83#define ireq_net req.__req_common.skc_net
84#define ireq_state req.__req_common.skc_state
85#define ireq_family req.__req_common.skc_family
86
87 kmemcheck_bitfield_begin(flags);
88 u16 snd_wscale : 4,
89 rcv_wscale : 4,
90 tstamp_ok : 1,
91 sack_ok : 1,
92 wscale_ok : 1,
93 ecn_ok : 1,
94 acked : 1,
95 no_srccheck: 1;
96 kmemcheck_bitfield_end(flags);
97 u32 ir_mark;
98 union {
99 struct ip_options_rcu *opt;
100#if IS_ENABLED(CONFIG_IPV6)
101 struct {
102 struct ipv6_txoptions *ipv6_opt;
103 struct sk_buff *pktopts;
104 };
105#endif
106 };
107};
108
109static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
110{
111 return (struct inet_request_sock *)sk;
112}
113
114static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
115{
116 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
117 return skb->mark;
118
119 return sk->sk_mark;
120}
121
122static inline int inet_request_bound_dev_if(const struct sock *sk,
123 struct sk_buff *skb)
124{
125#ifdef CONFIG_NET_L3_MASTER_DEV
126 struct net *net = sock_net(sk);
127
128 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
129 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
130#endif
131
132 return sk->sk_bound_dev_if;
133}
134
135struct inet_cork {
136 unsigned int flags;
137 __be32 addr;
138 struct ip_options *opt;
139 unsigned int fragsize;
140 int length; /* Total length of all frames */
141 struct dst_entry *dst;
142 u8 tx_flags;
143 __u8 ttl;
144 __s16 tos;
145 char priority;
146};
147
148struct inet_cork_full {
149 struct inet_cork base;
150 struct flowi fl;
151};
152
153struct ip_mc_socklist;
154struct ipv6_pinfo;
155struct rtable;
156
157/** struct inet_sock - representation of INET sockets
158 *
159 * @sk - ancestor class
160 * @pinet6 - pointer to IPv6 control block
161 * @inet_daddr - Foreign IPv4 addr
162 * @inet_rcv_saddr - Bound local IPv4 addr
163 * @inet_dport - Destination port
164 * @inet_num - Local port
165 * @inet_saddr - Sending source
166 * @uc_ttl - Unicast TTL
167 * @inet_sport - Source port
168 * @inet_id - ID counter for DF pkts
169 * @tos - TOS
170 * @mc_ttl - Multicasting TTL
171 * @is_icsk - is this an inet_connection_sock?
172 * @uc_index - Unicast outgoing device index
173 * @mc_index - Multicast device index
174 * @mc_list - Group array
175 * @cork - info to build ip hdr on each ip frag while socket is corked
176 */
177struct inet_sock {
178 /* sk and pinet6 has to be the first two members of inet_sock */
179 struct sock sk;
180#if IS_ENABLED(CONFIG_IPV6)
181 struct ipv6_pinfo *pinet6;
182#endif
183 /* Socket demultiplex comparisons on incoming packets. */
184#define inet_daddr sk.__sk_common.skc_daddr
185#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
186#define inet_dport sk.__sk_common.skc_dport
187#define inet_num sk.__sk_common.skc_num
188
189 __be32 inet_saddr;
190 __s16 uc_ttl;
191 __u16 cmsg_flags;
192 __be16 inet_sport;
193 __u16 inet_id;
194
195 struct ip_options_rcu __rcu *inet_opt;
196 int rx_dst_ifindex;
197 __u8 tos;
198 __u8 min_ttl;
199 __u8 mc_ttl;
200 __u8 pmtudisc;
201 __u8 recverr:1,
202 is_icsk:1,
203 freebind:1,
204 hdrincl:1,
205 mc_loop:1,
206 transparent:1,
207 mc_all:1,
208 nodefrag:1;
209 __u8 bind_address_no_port:1;
210 __u8 rcv_tos;
211 __u8 convert_csum;
212 int uc_index;
213 int mc_index;
214 __be32 mc_addr;
215 struct ip_mc_socklist __rcu *mc_list;
216 struct inet_cork_full cork;
217};
218
219#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
220#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
221
222/* cmsg flags for inet */
223#define IP_CMSG_PKTINFO BIT(0)
224#define IP_CMSG_TTL BIT(1)
225#define IP_CMSG_TOS BIT(2)
226#define IP_CMSG_RECVOPTS BIT(3)
227#define IP_CMSG_RETOPTS BIT(4)
228#define IP_CMSG_PASSSEC BIT(5)
229#define IP_CMSG_ORIGDSTADDR BIT(6)
230#define IP_CMSG_CHECKSUM BIT(7)
231#define IP_CMSG_RECVFRAGSIZE BIT(8)
232
233/**
234 * sk_to_full_sk - Access to a full socket
235 * @sk: pointer to a socket
236 *
237 * SYNACK messages might be attached to request sockets.
238 * Some places want to reach the listener in this case.
239 */
240static inline struct sock *sk_to_full_sk(struct sock *sk)
241{
242#ifdef CONFIG_INET
243 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
244 sk = inet_reqsk(sk)->rsk_listener;
245#endif
246 return sk;
247}
248
249/* sk_to_full_sk() variant with a const argument */
250static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
251{
252#ifdef CONFIG_INET
253 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
254 sk = ((const struct request_sock *)sk)->rsk_listener;
255#endif
256 return sk;
257}
258
259static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
260{
261 return sk_to_full_sk(skb->sk);
262}
263
264static inline struct inet_sock *inet_sk(const struct sock *sk)
265{
266 return (struct inet_sock *)sk;
267}
268
269static inline void __inet_sk_copy_descendant(struct sock *sk_to,
270 const struct sock *sk_from,
271 const int ancestor_size)
272{
273 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
274 sk_from->sk_prot->obj_size - ancestor_size);
275}
276#if !(IS_ENABLED(CONFIG_IPV6))
277static inline void inet_sk_copy_descendant(struct sock *sk_to,
278 const struct sock *sk_from)
279{
280 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
281}
282#endif
283
284int inet_sk_rebuild_header(struct sock *sk);
285
286static inline unsigned int __inet_ehashfn(const __be32 laddr,
287 const __u16 lport,
288 const __be32 faddr,
289 const __be16 fport,
290 u32 initval)
291{
292 return jhash_3words((__force __u32) laddr,
293 (__force __u32) faddr,
294 ((__u32) lport) << 16 | (__force __u32)fport,
295 initval);
296}
297
298struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
299 struct sock *sk_listener,
300 bool attach_listener);
301
302static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
303{
304 __u8 flags = 0;
305
306 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
307 flags |= FLOWI_FLAG_ANYSRC;
308 return flags;
309}
310
311static inline void inet_inc_convert_csum(struct sock *sk)
312{
313 inet_sk(sk)->convert_csum++;
314}
315
316static inline void inet_dec_convert_csum(struct sock *sk)
317{
318 if (inet_sk(sk)->convert_csum > 0)
319 inet_sk(sk)->convert_csum--;
320}
321
322static inline bool inet_get_convert_csum(struct sock *sk)
323{
324 return !!inet_sk(sk)->convert_csum;
325}
326
327#endif /* _INET_SOCK_H */