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/kmemcheck.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <linux/jhash.h>
24 #include <linux/netdevice.h>
28 #include <net/request_sock.h>
29 #include <net/netns/hash.h>
30 #include <net/tcp_states.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
86 kmemcheck_bitfield_begin(flags);
95 kmemcheck_bitfield_end(flags);
98 struct ip_options_rcu *opt;
99 struct sk_buff *pktopts;
103 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
105 return (struct inet_request_sock *)sk;
108 static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
110 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
119 struct ip_options *opt;
120 unsigned int fragsize;
121 int length; /* Total length of all frames */
122 struct dst_entry *dst;
129 struct inet_cork_full {
130 struct inet_cork base;
134 struct ip_mc_socklist;
138 /** struct inet_sock - representation of INET sockets
140 * @sk - ancestor class
141 * @pinet6 - pointer to IPv6 control block
142 * @inet_daddr - Foreign IPv4 addr
143 * @inet_rcv_saddr - Bound local IPv4 addr
144 * @inet_dport - Destination port
145 * @inet_num - Local port
146 * @inet_saddr - Sending source
147 * @uc_ttl - Unicast TTL
148 * @inet_sport - Source port
149 * @inet_id - ID counter for DF pkts
151 * @mc_ttl - Multicasting TTL
152 * @is_icsk - is this an inet_connection_sock?
153 * @uc_index - Unicast outgoing device index
154 * @mc_index - Multicast device index
155 * @mc_list - Group array
156 * @cork - info to build ip hdr on each ip frag while socket is corked
159 /* sk and pinet6 has to be the first two members of inet_sock */
161 #if IS_ENABLED(CONFIG_IPV6)
162 struct ipv6_pinfo *pinet6;
164 /* Socket demultiplex comparisons on incoming packets. */
165 #define inet_daddr sk.__sk_common.skc_daddr
166 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
167 #define inet_dport sk.__sk_common.skc_dport
168 #define inet_num sk.__sk_common.skc_num
176 struct ip_options_rcu __rcu *inet_opt;
195 struct ip_mc_socklist __rcu *mc_list;
196 struct inet_cork_full cork;
199 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
200 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
202 /* cmsg flags for inet */
203 #define IP_CMSG_PKTINFO BIT(0)
204 #define IP_CMSG_TTL BIT(1)
205 #define IP_CMSG_TOS BIT(2)
206 #define IP_CMSG_RECVOPTS BIT(3)
207 #define IP_CMSG_RETOPTS BIT(4)
208 #define IP_CMSG_PASSSEC BIT(5)
209 #define IP_CMSG_ORIGDSTADDR BIT(6)
210 #define IP_CMSG_CHECKSUM BIT(7)
212 static inline struct inet_sock *inet_sk(const struct sock *sk)
214 return (struct inet_sock *)sk;
217 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
218 const struct sock *sk_from,
219 const int ancestor_size)
221 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
222 sk_from->sk_prot->obj_size - ancestor_size);
224 #if !(IS_ENABLED(CONFIG_IPV6))
225 static inline void inet_sk_copy_descendant(struct sock *sk_to,
226 const struct sock *sk_from)
228 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
232 int inet_sk_rebuild_header(struct sock *sk);
234 static inline unsigned int __inet_ehashfn(const __be32 laddr,
240 return jhash_3words((__force __u32) laddr,
241 (__force __u32) faddr,
242 ((__u32) lport) << 16 | (__force __u32)fport,
246 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
247 struct sock *sk_listener);
249 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
253 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
254 flags |= FLOWI_FLAG_ANYSRC;
258 static inline void inet_inc_convert_csum(struct sock *sk)
260 inet_sk(sk)->convert_csum++;
263 static inline void inet_dec_convert_csum(struct sock *sk)
265 if (inet_sk(sk)->convert_csum > 0)
266 inet_sk(sk)->convert_csum--;
269 static inline bool inet_get_convert_csum(struct sock *sk)
271 return !!inet_sk(sk)->convert_csum;
274 #endif /* _INET_SOCK_H */