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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>
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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 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
111 return skb->mark;
112
113 return sk->sk_mark;
114}
115
116static inline int inet_request_bound_dev_if(const struct sock *sk,
117 struct sk_buff *skb)
118{
119#ifdef CONFIG_NET_L3_MASTER_DEV
120 struct net *net = sock_net(sk);
121
122 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
123 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
124#endif
125
126 return sk->sk_bound_dev_if;
127}
128
129static inline int inet_sk_bound_l3mdev(const struct sock *sk)
130{
131#ifdef CONFIG_NET_L3_MASTER_DEV
132 struct net *net = sock_net(sk);
133
134 if (!net->ipv4.sysctl_tcp_l3mdev_accept)
135 return l3mdev_master_ifindex_by_index(net,
136 sk->sk_bound_dev_if);
137#endif
138
139 return 0;
140}
141
142static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
143 int dif, int sdif)
144{
145 if (!bound_dev_if)
146 return !sdif || l3mdev_accept;
147 return bound_dev_if == dif || bound_dev_if == sdif;
148}
149
150struct inet_cork {
151 unsigned int flags;
152 __be32 addr;
153 struct ip_options *opt;
154 unsigned int fragsize;
155 int length;
156 struct dst_entry *dst;
157 u8 tx_flags;
158 __u8 ttl;
159 __s16 tos;
160 char priority;
161 __u16 gso_size;
162 u64 transmit_time;
163 u32 mark;
164};
165
166struct inet_cork_full {
167 struct inet_cork base;
168 struct flowi fl;
169};
170
171struct ip_mc_socklist;
172struct ipv6_pinfo;
173struct rtable;
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195struct inet_sock {
196
197 struct sock sk;
198#if IS_ENABLED(CONFIG_IPV6)
199 struct ipv6_pinfo *pinet6;
200#endif
201
202#define inet_daddr sk.__sk_common.skc_daddr
203#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
204#define inet_dport sk.__sk_common.skc_dport
205#define inet_num sk.__sk_common.skc_num
206
207 __be32 inet_saddr;
208 __s16 uc_ttl;
209 __u16 cmsg_flags;
210 struct ip_options_rcu __rcu *inet_opt;
211 __be16 inet_sport;
212 __u16 inet_id;
213
214 __u8 tos;
215 __u8 min_ttl;
216 __u8 mc_ttl;
217 __u8 pmtudisc;
218 __u8 recverr:1,
219 is_icsk:1,
220 freebind:1,
221 hdrincl:1,
222 mc_loop:1,
223 transparent:1,
224 mc_all:1,
225 nodefrag:1;
226 __u8 bind_address_no_port:1,
227 recverr_rfc4884:1,
228 defer_connect:1;
229
230
231
232 __u8 rcv_tos;
233 __u8 convert_csum;
234 int uc_index;
235 int mc_index;
236 __be32 mc_addr;
237 struct ip_mc_socklist __rcu *mc_list;
238 struct inet_cork_full cork;
239};
240
241#define IPCORK_OPT 1
242#define IPCORK_ALLFRAG 2
243
244
245#define IP_CMSG_PKTINFO BIT(0)
246#define IP_CMSG_TTL BIT(1)
247#define IP_CMSG_TOS BIT(2)
248#define IP_CMSG_RECVOPTS BIT(3)
249#define IP_CMSG_RETOPTS BIT(4)
250#define IP_CMSG_PASSSEC BIT(5)
251#define IP_CMSG_ORIGDSTADDR BIT(6)
252#define IP_CMSG_CHECKSUM BIT(7)
253#define IP_CMSG_RECVFRAGSIZE BIT(8)
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261
262static inline struct sock *sk_to_full_sk(struct sock *sk)
263{
264#ifdef CONFIG_INET
265 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
266 sk = inet_reqsk(sk)->rsk_listener;
267#endif
268 return sk;
269}
270
271
272static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
273{
274#ifdef CONFIG_INET
275 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
276 sk = ((const struct request_sock *)sk)->rsk_listener;
277#endif
278 return sk;
279}
280
281static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
282{
283 return sk_to_full_sk(skb->sk);
284}
285
286static inline struct inet_sock *inet_sk(const struct sock *sk)
287{
288 return (struct inet_sock *)sk;
289}
290
291static inline void __inet_sk_copy_descendant(struct sock *sk_to,
292 const struct sock *sk_from,
293 const int ancestor_size)
294{
295 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
296 sk_from->sk_prot->obj_size - ancestor_size);
297}
298
299int inet_sk_rebuild_header(struct sock *sk);
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308static inline int inet_sk_state_load(const struct sock *sk)
309{
310
311 return smp_load_acquire(&sk->sk_state);
312}
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321
322void inet_sk_state_store(struct sock *sk, int newstate);
323
324void inet_sk_set_state(struct sock *sk, int state);
325
326static inline unsigned int __inet_ehashfn(const __be32 laddr,
327 const __u16 lport,
328 const __be32 faddr,
329 const __be16 fport,
330 u32 initval)
331{
332 return jhash_3words((__force __u32) laddr,
333 (__force __u32) faddr,
334 ((__u32) lport) << 16 | (__force __u32)fport,
335 initval);
336}
337
338struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
339 struct sock *sk_listener,
340 bool attach_listener);
341
342static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
343{
344 __u8 flags = 0;
345
346 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
347 flags |= FLOWI_FLAG_ANYSRC;
348 return flags;
349}
350
351static inline void inet_inc_convert_csum(struct sock *sk)
352{
353 inet_sk(sk)->convert_csum++;
354}
355
356static inline void inet_dec_convert_csum(struct sock *sk)
357{
358 if (inet_sk(sk)->convert_csum > 0)
359 inet_sk(sk)->convert_csum--;
360}
361
362static inline bool inet_get_convert_csum(struct sock *sk)
363{
364 return !!inet_sk(sk)->convert_csum;
365}
366
367
368static inline bool inet_can_nonlocal_bind(struct net *net,
369 struct inet_sock *inet)
370{
371 return net->ipv4.sysctl_ip_nonlocal_bind ||
372 inet->freebind || inet->transparent;
373}
374
375static inline bool inet_addr_valid_or_nonlocal(struct net *net,
376 struct inet_sock *inet,
377 __be32 addr,
378 int addr_type)
379{
380 return inet_can_nonlocal_bind(net, inet) ||
381 addr == htonl(INADDR_ANY) ||
382 addr_type == RTN_LOCAL ||
383 addr_type == RTN_MULTICAST ||
384 addr_type == RTN_BROADCAST;
385}
386
387#endif
388