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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for inet_sock
8 *
9 * Authors: Many, reorganised here by
10 * Arnaldo Carvalho de Melo <acme@mandriva.com>
11 */
12#ifndef _INET_SOCK_H
13#define _INET_SOCK_H
14
15#include <linux/bitops.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/jhash.h>
19#include <linux/netdevice.h>
20
21#include <net/flow.h>
22#include <net/sock.h>
23#include <net/request_sock.h>
24#include <net/netns/hash.h>
25#include <net/tcp_states.h>
26#include <net/l3mdev.h>
27
28/** struct ip_options - IP Options
29 *
30 * @faddr - Saved first hop address
31 * @nexthop - Saved nexthop address in LSRR and SSRR
32 * @is_strictroute - Strict source route
33 * @srr_is_hit - Packet destination addr was our one
34 * @is_changed - IP checksum more not valid
35 * @rr_needaddr - Need to record addr of outgoing dev
36 * @ts_needtime - Need to record timestamp
37 * @ts_needaddr - Need to record addr of outgoing dev
38 */
39struct ip_options {
40 __be32 faddr;
41 __be32 nexthop;
42 unsigned char optlen;
43 unsigned char srr;
44 unsigned char rr;
45 unsigned char ts;
46 unsigned char is_strictroute:1,
47 srr_is_hit:1,
48 is_changed:1,
49 rr_needaddr:1,
50 ts_needtime:1,
51 ts_needaddr:1;
52 unsigned char router_alert;
53 unsigned char cipso;
54 unsigned char __pad2;
55 unsigned char __data[];
56};
57
58struct ip_options_rcu {
59 struct rcu_head rcu;
60 struct ip_options opt;
61};
62
63struct ip_options_data {
64 struct ip_options_rcu opt;
65 char data[40];
66};
67
68struct inet_request_sock {
69 struct request_sock req;
70#define ir_loc_addr req.__req_common.skc_rcv_saddr
71#define ir_rmt_addr req.__req_common.skc_daddr
72#define ir_num req.__req_common.skc_num
73#define ir_rmt_port req.__req_common.skc_dport
74#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
75#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
76#define ir_iif req.__req_common.skc_bound_dev_if
77#define ir_cookie req.__req_common.skc_cookie
78#define ireq_net req.__req_common.skc_net
79#define ireq_state req.__req_common.skc_state
80#define ireq_family req.__req_common.skc_family
81
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 smc_ok : 1;
91 u32 ir_mark;
92 union {
93 struct ip_options_rcu __rcu *ireq_opt;
94#if IS_ENABLED(CONFIG_IPV6)
95 struct {
96 struct ipv6_txoptions *ipv6_opt;
97 struct sk_buff *pktopts;
98 };
99#endif
100 };
101};
102
103static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
104{
105 return (struct inet_request_sock *)sk;
106}
107
108static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
109{
110 u32 mark = READ_ONCE(sk->sk_mark);
111
112 if (!mark && READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
113 return skb->mark;
114
115 return mark;
116}
117
118static inline int inet_request_bound_dev_if(const struct sock *sk,
119 struct sk_buff *skb)
120{
121 int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
122#ifdef CONFIG_NET_L3_MASTER_DEV
123 struct net *net = sock_net(sk);
124
125 if (!bound_dev_if && READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
126 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
127#endif
128
129 return bound_dev_if;
130}
131
132static inline int inet_sk_bound_l3mdev(const struct sock *sk)
133{
134#ifdef CONFIG_NET_L3_MASTER_DEV
135 struct net *net = sock_net(sk);
136
137 if (!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
138 return l3mdev_master_ifindex_by_index(net,
139 sk->sk_bound_dev_if);
140#endif
141
142 return 0;
143}
144
145static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
146 int dif, int sdif)
147{
148 if (!bound_dev_if)
149 return !sdif || l3mdev_accept;
150 return bound_dev_if == dif || bound_dev_if == sdif;
151}
152
153static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
154 int dif, int sdif)
155{
156#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
157 return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept),
158 bound_dev_if, dif, sdif);
159#else
160 return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
161#endif
162}
163
164struct inet_cork {
165 unsigned int flags;
166 __be32 addr;
167 struct ip_options *opt;
168 unsigned int fragsize;
169 int length; /* Total length of all frames */
170 struct dst_entry *dst;
171 u8 tx_flags;
172 __u8 ttl;
173 __s16 tos;
174 char priority;
175 __u16 gso_size;
176 u64 transmit_time;
177 u32 mark;
178};
179
180struct inet_cork_full {
181 struct inet_cork base;
182 struct flowi fl;
183};
184
185struct ip_mc_socklist;
186struct ipv6_pinfo;
187struct rtable;
188
189/** struct inet_sock - representation of INET sockets
190 *
191 * @sk - ancestor class
192 * @pinet6 - pointer to IPv6 control block
193 * @inet_daddr - Foreign IPv4 addr
194 * @inet_rcv_saddr - Bound local IPv4 addr
195 * @inet_dport - Destination port
196 * @inet_num - Local port
197 * @inet_flags - various atomic flags
198 * @inet_saddr - Sending source
199 * @uc_ttl - Unicast TTL
200 * @inet_sport - Source port
201 * @inet_id - ID counter for DF pkts
202 * @tos - TOS
203 * @mc_ttl - Multicasting TTL
204 * @uc_index - Unicast outgoing device index
205 * @mc_index - Multicast device index
206 * @mc_list - Group array
207 * @cork - info to build ip hdr on each ip frag while socket is corked
208 */
209struct inet_sock {
210 /* sk and pinet6 has to be the first two members of inet_sock */
211 struct sock sk;
212#if IS_ENABLED(CONFIG_IPV6)
213 struct ipv6_pinfo *pinet6;
214#endif
215 /* Socket demultiplex comparisons on incoming packets. */
216#define inet_daddr sk.__sk_common.skc_daddr
217#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
218#define inet_dport sk.__sk_common.skc_dport
219#define inet_num sk.__sk_common.skc_num
220
221 unsigned long inet_flags;
222 __be32 inet_saddr;
223 __s16 uc_ttl;
224 __be16 inet_sport;
225 struct ip_options_rcu __rcu *inet_opt;
226 atomic_t inet_id;
227
228 __u8 tos;
229 __u8 min_ttl;
230 __u8 mc_ttl;
231 __u8 pmtudisc;
232 __u8 rcv_tos;
233 __u8 convert_csum;
234 int uc_index;
235 int mc_index;
236 __be32 mc_addr;
237 u32 local_port_range; /* high << 16 | low */
238
239 struct ip_mc_socklist __rcu *mc_list;
240 struct inet_cork_full cork;
241};
242
243#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
244
245enum {
246 INET_FLAGS_PKTINFO = 0,
247 INET_FLAGS_TTL = 1,
248 INET_FLAGS_TOS = 2,
249 INET_FLAGS_RECVOPTS = 3,
250 INET_FLAGS_RETOPTS = 4,
251 INET_FLAGS_PASSSEC = 5,
252 INET_FLAGS_ORIGDSTADDR = 6,
253 INET_FLAGS_CHECKSUM = 7,
254 INET_FLAGS_RECVFRAGSIZE = 8,
255
256 INET_FLAGS_RECVERR = 9,
257 INET_FLAGS_RECVERR_RFC4884 = 10,
258 INET_FLAGS_FREEBIND = 11,
259 INET_FLAGS_HDRINCL = 12,
260 INET_FLAGS_MC_LOOP = 13,
261 INET_FLAGS_MC_ALL = 14,
262 INET_FLAGS_TRANSPARENT = 15,
263 INET_FLAGS_IS_ICSK = 16,
264 INET_FLAGS_NODEFRAG = 17,
265 INET_FLAGS_BIND_ADDRESS_NO_PORT = 18,
266 INET_FLAGS_DEFER_CONNECT = 19,
267 INET_FLAGS_MC6_LOOP = 20,
268 INET_FLAGS_RECVERR6_RFC4884 = 21,
269 INET_FLAGS_MC6_ALL = 22,
270 INET_FLAGS_AUTOFLOWLABEL_SET = 23,
271 INET_FLAGS_AUTOFLOWLABEL = 24,
272 INET_FLAGS_DONTFRAG = 25,
273 INET_FLAGS_RECVERR6 = 26,
274 INET_FLAGS_REPFLOW = 27,
275 INET_FLAGS_RTALERT_ISOLATE = 28,
276 INET_FLAGS_SNDFLOW = 29,
277 INET_FLAGS_RTALERT = 30,
278};
279
280/* cmsg flags for inet */
281#define IP_CMSG_PKTINFO BIT(INET_FLAGS_PKTINFO)
282#define IP_CMSG_TTL BIT(INET_FLAGS_TTL)
283#define IP_CMSG_TOS BIT(INET_FLAGS_TOS)
284#define IP_CMSG_RECVOPTS BIT(INET_FLAGS_RECVOPTS)
285#define IP_CMSG_RETOPTS BIT(INET_FLAGS_RETOPTS)
286#define IP_CMSG_PASSSEC BIT(INET_FLAGS_PASSSEC)
287#define IP_CMSG_ORIGDSTADDR BIT(INET_FLAGS_ORIGDSTADDR)
288#define IP_CMSG_CHECKSUM BIT(INET_FLAGS_CHECKSUM)
289#define IP_CMSG_RECVFRAGSIZE BIT(INET_FLAGS_RECVFRAGSIZE)
290
291#define IP_CMSG_ALL (IP_CMSG_PKTINFO | IP_CMSG_TTL | \
292 IP_CMSG_TOS | IP_CMSG_RECVOPTS | \
293 IP_CMSG_RETOPTS | IP_CMSG_PASSSEC | \
294 IP_CMSG_ORIGDSTADDR | IP_CMSG_CHECKSUM | \
295 IP_CMSG_RECVFRAGSIZE)
296
297static inline unsigned long inet_cmsg_flags(const struct inet_sock *inet)
298{
299 return READ_ONCE(inet->inet_flags) & IP_CMSG_ALL;
300}
301
302#define inet_test_bit(nr, sk) \
303 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
304#define inet_set_bit(nr, sk) \
305 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
306#define inet_clear_bit(nr, sk) \
307 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
308#define inet_assign_bit(nr, sk, val) \
309 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
310
311/**
312 * sk_to_full_sk - Access to a full socket
313 * @sk: pointer to a socket
314 *
315 * SYNACK messages might be attached to request sockets.
316 * Some places want to reach the listener in this case.
317 */
318static inline struct sock *sk_to_full_sk(struct sock *sk)
319{
320#ifdef CONFIG_INET
321 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
322 sk = inet_reqsk(sk)->rsk_listener;
323#endif
324 return sk;
325}
326
327/* sk_to_full_sk() variant with a const argument */
328static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
329{
330#ifdef CONFIG_INET
331 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
332 sk = ((const struct request_sock *)sk)->rsk_listener;
333#endif
334 return sk;
335}
336
337static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
338{
339 return sk_to_full_sk(skb->sk);
340}
341
342#define inet_sk(ptr) container_of_const(ptr, struct inet_sock, sk)
343
344static inline void __inet_sk_copy_descendant(struct sock *sk_to,
345 const struct sock *sk_from,
346 const int ancestor_size)
347{
348 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
349 sk_from->sk_prot->obj_size - ancestor_size);
350}
351
352int inet_sk_rebuild_header(struct sock *sk);
353
354/**
355 * inet_sk_state_load - read sk->sk_state for lockless contexts
356 * @sk: socket pointer
357 *
358 * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
359 * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
360 */
361static inline int inet_sk_state_load(const struct sock *sk)
362{
363 /* state change might impact lockless readers. */
364 return smp_load_acquire(&sk->sk_state);
365}
366
367/**
368 * inet_sk_state_store - update sk->sk_state
369 * @sk: socket pointer
370 * @newstate: new state
371 *
372 * Paired with inet_sk_state_load(). Should be used in contexts where
373 * state change might impact lockless readers.
374 */
375void inet_sk_state_store(struct sock *sk, int newstate);
376
377void inet_sk_set_state(struct sock *sk, int state);
378
379static inline unsigned int __inet_ehashfn(const __be32 laddr,
380 const __u16 lport,
381 const __be32 faddr,
382 const __be16 fport,
383 u32 initval)
384{
385 return jhash_3words((__force __u32) laddr,
386 (__force __u32) faddr,
387 ((__u32) lport) << 16 | (__force __u32)fport,
388 initval);
389}
390
391struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
392 struct sock *sk_listener,
393 bool attach_listener);
394
395static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
396{
397 __u8 flags = 0;
398
399 if (inet_test_bit(TRANSPARENT, sk) || inet_test_bit(HDRINCL, sk))
400 flags |= FLOWI_FLAG_ANYSRC;
401 return flags;
402}
403
404static inline void inet_inc_convert_csum(struct sock *sk)
405{
406 inet_sk(sk)->convert_csum++;
407}
408
409static inline void inet_dec_convert_csum(struct sock *sk)
410{
411 if (inet_sk(sk)->convert_csum > 0)
412 inet_sk(sk)->convert_csum--;
413}
414
415static inline bool inet_get_convert_csum(struct sock *sk)
416{
417 return !!inet_sk(sk)->convert_csum;
418}
419
420
421static inline bool inet_can_nonlocal_bind(struct net *net,
422 struct inet_sock *inet)
423{
424 return READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) ||
425 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) ||
426 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);
427}
428
429static inline bool inet_addr_valid_or_nonlocal(struct net *net,
430 struct inet_sock *inet,
431 __be32 addr,
432 int addr_type)
433{
434 return inet_can_nonlocal_bind(net, inet) ||
435 addr == htonl(INADDR_ANY) ||
436 addr_type == RTN_LOCAL ||
437 addr_type == RTN_MULTICAST ||
438 addr_type == RTN_BROADCAST;
439}
440
441#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 */