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.
6 * Definitions for inet_sock
8 * Authors: Many, reorganised here by
9 * Arnaldo Carvalho de Melo <acme@mandriva.com>
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.
19 #include <linux/bitops.h>
20 #include <linux/string.h>
21 #include <linux/types.h>
22 #include <linux/jhash.h>
23 #include <linux/netdevice.h>
27 #include <net/request_sock.h>
28 #include <net/netns/hash.h>
29 #include <net/tcp_states.h>
30 #include <net/l3mdev.h>
32 /** struct ip_options - IP Options
34 * @faddr - Saved first hop address
35 * @nexthop - Saved nexthop address in LSRR and SSRR
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
50 unsigned char is_strictroute
:1,
56 unsigned char router_alert
;
59 unsigned char __data
[0];
62 struct ip_options_rcu
{
64 struct ip_options opt
;
67 struct ip_options_data
{
68 struct ip_options_rcu opt
;
72 struct inet_request_sock
{
73 struct request_sock req
;
74 #define ir_loc_addr req.__req_common.skc_rcv_saddr
75 #define ir_rmt_addr req.__req_common.skc_daddr
76 #define ir_num req.__req_common.skc_num
77 #define ir_rmt_port req.__req_common.skc_dport
78 #define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
79 #define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
80 #define ir_iif req.__req_common.skc_bound_dev_if
81 #define ir_cookie req.__req_common.skc_cookie
82 #define ireq_net req.__req_common.skc_net
83 #define ireq_state req.__req_common.skc_state
84 #define ireq_family req.__req_common.skc_family
97 struct ip_options_rcu __rcu
*ireq_opt
;
98 #if IS_ENABLED(CONFIG_IPV6)
100 struct ipv6_txoptions
*ipv6_opt
;
101 struct sk_buff
*pktopts
;
107 static inline struct inet_request_sock
*inet_rsk(const struct request_sock
*sk
)
109 return (struct inet_request_sock
*)sk
;
112 static inline u32
inet_request_mark(const struct sock
*sk
, struct sk_buff
*skb
)
114 if (!sk
->sk_mark
&& sock_net(sk
)->ipv4
.sysctl_tcp_fwmark_accept
)
120 static inline int inet_request_bound_dev_if(const struct sock
*sk
,
123 #ifdef CONFIG_NET_L3_MASTER_DEV
124 struct net
*net
= sock_net(sk
);
126 if (!sk
->sk_bound_dev_if
&& net
->ipv4
.sysctl_tcp_l3mdev_accept
)
127 return l3mdev_master_ifindex_by_index(net
, skb
->skb_iif
);
130 return sk
->sk_bound_dev_if
;
136 struct ip_options
*opt
;
137 unsigned int fragsize
;
138 int length
; /* Total length of all frames */
139 struct dst_entry
*dst
;
146 struct inet_cork_full
{
147 struct inet_cork base
;
151 struct ip_mc_socklist
;
155 /** struct inet_sock - representation of INET sockets
157 * @sk - ancestor class
158 * @pinet6 - pointer to IPv6 control block
159 * @inet_daddr - Foreign IPv4 addr
160 * @inet_rcv_saddr - Bound local IPv4 addr
161 * @inet_dport - Destination port
162 * @inet_num - Local port
163 * @inet_saddr - Sending source
164 * @uc_ttl - Unicast TTL
165 * @inet_sport - Source port
166 * @inet_id - ID counter for DF pkts
168 * @mc_ttl - Multicasting TTL
169 * @is_icsk - is this an inet_connection_sock?
170 * @uc_index - Unicast outgoing device index
171 * @mc_index - Multicast device index
172 * @mc_list - Group array
173 * @cork - info to build ip hdr on each ip frag while socket is corked
176 /* sk and pinet6 has to be the first two members of inet_sock */
178 #if IS_ENABLED(CONFIG_IPV6)
179 struct ipv6_pinfo
*pinet6
;
181 /* Socket demultiplex comparisons on incoming packets. */
182 #define inet_daddr sk.__sk_common.skc_daddr
183 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
184 #define inet_dport sk.__sk_common.skc_dport
185 #define inet_num sk.__sk_common.skc_num
193 struct ip_options_rcu __rcu
*inet_opt
;
207 __u8 bind_address_no_port
:1,
208 defer_connect
:1; /* Indicates that fastopen_connect is set
209 * and cookie exists so we defer connect
210 * until first data frame is written
217 struct ip_mc_socklist __rcu
*mc_list
;
218 struct inet_cork_full cork
;
221 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
222 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
224 /* cmsg flags for inet */
225 #define IP_CMSG_PKTINFO BIT(0)
226 #define IP_CMSG_TTL BIT(1)
227 #define IP_CMSG_TOS BIT(2)
228 #define IP_CMSG_RECVOPTS BIT(3)
229 #define IP_CMSG_RETOPTS BIT(4)
230 #define IP_CMSG_PASSSEC BIT(5)
231 #define IP_CMSG_ORIGDSTADDR BIT(6)
232 #define IP_CMSG_CHECKSUM BIT(7)
233 #define IP_CMSG_RECVFRAGSIZE BIT(8)
236 * sk_to_full_sk - Access to a full socket
237 * @sk: pointer to a socket
239 * SYNACK messages might be attached to request sockets.
240 * Some places want to reach the listener in this case.
242 static inline struct sock
*sk_to_full_sk(struct sock
*sk
)
245 if (sk
&& sk
->sk_state
== TCP_NEW_SYN_RECV
)
246 sk
= inet_reqsk(sk
)->rsk_listener
;
251 /* sk_to_full_sk() variant with a const argument */
252 static inline const struct sock
*sk_const_to_full_sk(const struct sock
*sk
)
255 if (sk
&& sk
->sk_state
== TCP_NEW_SYN_RECV
)
256 sk
= ((const struct request_sock
*)sk
)->rsk_listener
;
261 static inline struct sock
*skb_to_full_sk(const struct sk_buff
*skb
)
263 return sk_to_full_sk(skb
->sk
);
266 static inline struct inet_sock
*inet_sk(const struct sock
*sk
)
268 return (struct inet_sock
*)sk
;
271 static inline void __inet_sk_copy_descendant(struct sock
*sk_to
,
272 const struct sock
*sk_from
,
273 const int ancestor_size
)
275 memcpy(inet_sk(sk_to
) + 1, inet_sk(sk_from
) + 1,
276 sk_from
->sk_prot
->obj_size
- ancestor_size
);
278 #if !(IS_ENABLED(CONFIG_IPV6))
279 static inline void inet_sk_copy_descendant(struct sock
*sk_to
,
280 const struct sock
*sk_from
)
282 __inet_sk_copy_descendant(sk_to
, sk_from
, sizeof(struct inet_sock
));
286 int inet_sk_rebuild_header(struct sock
*sk
);
288 static inline unsigned int __inet_ehashfn(const __be32 laddr
,
294 return jhash_3words((__force __u32
) laddr
,
295 (__force __u32
) faddr
,
296 ((__u32
) lport
) << 16 | (__force __u32
)fport
,
300 struct request_sock
*inet_reqsk_alloc(const struct request_sock_ops
*ops
,
301 struct sock
*sk_listener
,
302 bool attach_listener
);
304 static inline __u8
inet_sk_flowi_flags(const struct sock
*sk
)
308 if (inet_sk(sk
)->transparent
|| inet_sk(sk
)->hdrincl
)
309 flags
|= FLOWI_FLAG_ANYSRC
;
313 static inline void inet_inc_convert_csum(struct sock
*sk
)
315 inet_sk(sk
)->convert_csum
++;
318 static inline void inet_dec_convert_csum(struct sock
*sk
)
320 if (inet_sk(sk
)->convert_csum
> 0)
321 inet_sk(sk
)->convert_csum
--;
324 static inline bool inet_get_convert_csum(struct sock
*sk
)
326 return !!inet_sk(sk
)->convert_csum
;
329 #endif /* _INET_SOCK_H */