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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>
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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;
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;
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177struct inet_sock {
178
179 struct sock sk;
180#if IS_ENABLED(CONFIG_IPV6)
181 struct ipv6_pinfo *pinet6;
182#endif
183
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
220#define IPCORK_ALLFRAG 2
221
222
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)
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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
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
328