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.
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>
31 /** struct ip_options - IP Options
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
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 #if IS_ENABLED(CONFIG_IPV6)
81 kmemcheck_bitfield_begin(flags);
90 kmemcheck_bitfield_end(flags);
91 struct ip_options_rcu *opt;
94 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
96 return (struct inet_request_sock *)sk;
102 struct ip_options *opt;
103 unsigned int fragsize;
104 int length; /* Total length of all frames */
105 struct dst_entry *dst;
109 struct inet_cork_full {
110 struct inet_cork base;
114 struct ip_mc_socklist;
118 /** struct inet_sock - representation of INET sockets
120 * @sk - ancestor class
121 * @pinet6 - pointer to IPv6 control block
122 * @inet_daddr - Foreign IPv4 addr
123 * @inet_rcv_saddr - Bound local IPv4 addr
124 * @inet_dport - Destination port
125 * @inet_num - Local port
126 * @inet_saddr - Sending source
127 * @uc_ttl - Unicast TTL
128 * @inet_sport - Source port
129 * @inet_id - ID counter for DF pkts
131 * @mc_ttl - Multicasting TTL
132 * @is_icsk - is this an inet_connection_sock?
133 * @uc_index - Unicast outgoing device index
134 * @mc_index - Multicast device index
135 * @mc_list - Group array
136 * @cork - info to build ip hdr on each ip frag while socket is corked
139 /* sk and pinet6 has to be the first two members of inet_sock */
141 #if IS_ENABLED(CONFIG_IPV6)
142 struct ipv6_pinfo *pinet6;
144 /* Socket demultiplex comparisons on incoming packets. */
145 #define inet_daddr sk.__sk_common.skc_daddr
146 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
147 #define inet_addrpair sk.__sk_common.skc_addrpair
148 #define inet_dport sk.__sk_common.skc_dport
149 #define inet_num sk.__sk_common.skc_num
150 #define inet_portpair sk.__sk_common.skc_portpair
158 struct ip_options_rcu __rcu *inet_opt;
176 struct ip_mc_socklist __rcu *mc_list;
177 struct inet_cork_full cork;
180 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
181 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
183 static inline struct inet_sock *inet_sk(const struct sock *sk)
185 return (struct inet_sock *)sk;
188 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
189 const struct sock *sk_from,
190 const int ancestor_size)
192 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
193 sk_from->sk_prot->obj_size - ancestor_size);
195 #if !(IS_ENABLED(CONFIG_IPV6))
196 static inline void inet_sk_copy_descendant(struct sock *sk_to,
197 const struct sock *sk_from)
199 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
203 extern int inet_sk_rebuild_header(struct sock *sk);
205 extern u32 inet_ehash_secret;
206 extern u32 ipv6_hash_secret;
207 extern void build_ehash_secret(void);
209 static inline unsigned int inet_ehashfn(struct net *net,
210 const __be32 laddr, const __u16 lport,
211 const __be32 faddr, const __be16 fport)
213 return jhash_3words((__force __u32) laddr,
214 (__force __u32) faddr,
215 ((__u32) lport) << 16 | (__force __u32)fport,
216 inet_ehash_secret + net_hash_mix(net));
219 static inline int inet_sk_ehashfn(const struct sock *sk)
221 const struct inet_sock *inet = inet_sk(sk);
222 const __be32 laddr = inet->inet_rcv_saddr;
223 const __u16 lport = inet->inet_num;
224 const __be32 faddr = inet->inet_daddr;
225 const __be16 fport = inet->inet_dport;
226 struct net *net = sock_net(sk);
228 return inet_ehashfn(net, laddr, lport, faddr, fport);
231 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
233 struct request_sock *req = reqsk_alloc(ops);
234 struct inet_request_sock *ireq = inet_rsk(req);
237 kmemcheck_annotate_bitfield(ireq, flags);
244 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
248 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
249 flags |= FLOWI_FLAG_ANYSRC;
253 #endif /* _INET_SOCK_H */