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