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>
31 #include <net/l3mdev.h>
33 /** struct ip_options - IP Options
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
51 unsigned char is_strictroute:1,
57 unsigned char router_alert;
60 unsigned char __data[0];
63 struct ip_options_rcu {
65 struct ip_options opt;
68 struct ip_options_data {
69 struct ip_options_rcu opt;
73 struct 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
87 kmemcheck_bitfield_begin(flags);
96 kmemcheck_bitfield_end(flags);
99 struct ip_options_rcu __rcu *ireq_opt;
100 #if IS_ENABLED(CONFIG_IPV6)
102 struct ipv6_txoptions *ipv6_opt;
103 struct sk_buff *pktopts;
109 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
111 return (struct inet_request_sock *)sk;
114 static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
116 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
122 static inline int inet_request_bound_dev_if(const struct sock *sk,
125 #ifdef CONFIG_NET_L3_MASTER_DEV
126 struct net *net = sock_net(sk);
128 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
129 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
132 return sk->sk_bound_dev_if;
135 static inline struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq)
137 return rcu_dereference_check(ireq->ireq_opt,
138 refcount_read(&ireq->req.rsk_refcnt) > 0);
144 struct ip_options *opt;
145 unsigned int fragsize;
146 int length; /* Total length of all frames */
147 struct dst_entry *dst;
154 struct inet_cork_full {
155 struct inet_cork base;
159 struct ip_mc_socklist;
163 /** struct inet_sock - representation of INET sockets
165 * @sk - ancestor class
166 * @pinet6 - pointer to IPv6 control block
167 * @inet_daddr - Foreign IPv4 addr
168 * @inet_rcv_saddr - Bound local IPv4 addr
169 * @inet_dport - Destination port
170 * @inet_num - Local port
171 * @inet_saddr - Sending source
172 * @uc_ttl - Unicast TTL
173 * @inet_sport - Source port
174 * @inet_id - ID counter for DF pkts
176 * @mc_ttl - Multicasting TTL
177 * @is_icsk - is this an inet_connection_sock?
178 * @uc_index - Unicast outgoing device index
179 * @mc_index - Multicast device index
180 * @mc_list - Group array
181 * @cork - info to build ip hdr on each ip frag while socket is corked
184 /* sk and pinet6 has to be the first two members of inet_sock */
186 #if IS_ENABLED(CONFIG_IPV6)
187 struct ipv6_pinfo *pinet6;
189 /* Socket demultiplex comparisons on incoming packets. */
190 #define inet_daddr sk.__sk_common.skc_daddr
191 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
192 #define inet_dport sk.__sk_common.skc_dport
193 #define inet_num sk.__sk_common.skc_num
201 struct ip_options_rcu __rcu *inet_opt;
215 __u8 bind_address_no_port:1,
216 defer_connect:1; /* Indicates that fastopen_connect is set
217 * and cookie exists so we defer connect
218 * until first data frame is written
225 struct ip_mc_socklist __rcu *mc_list;
226 struct inet_cork_full cork;
229 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
230 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
232 /* cmsg flags for inet */
233 #define IP_CMSG_PKTINFO BIT(0)
234 #define IP_CMSG_TTL BIT(1)
235 #define IP_CMSG_TOS BIT(2)
236 #define IP_CMSG_RECVOPTS BIT(3)
237 #define IP_CMSG_RETOPTS BIT(4)
238 #define IP_CMSG_PASSSEC BIT(5)
239 #define IP_CMSG_ORIGDSTADDR BIT(6)
240 #define IP_CMSG_CHECKSUM BIT(7)
241 #define IP_CMSG_RECVFRAGSIZE BIT(8)
244 * sk_to_full_sk - Access to a full socket
245 * @sk: pointer to a socket
247 * SYNACK messages might be attached to request sockets.
248 * Some places want to reach the listener in this case.
250 static inline struct sock *sk_to_full_sk(struct sock *sk)
253 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
254 sk = inet_reqsk(sk)->rsk_listener;
259 /* sk_to_full_sk() variant with a const argument */
260 static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
263 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
264 sk = ((const struct request_sock *)sk)->rsk_listener;
269 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
271 return sk_to_full_sk(skb->sk);
274 static inline struct inet_sock *inet_sk(const struct sock *sk)
276 return (struct inet_sock *)sk;
279 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
280 const struct sock *sk_from,
281 const int ancestor_size)
283 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
284 sk_from->sk_prot->obj_size - ancestor_size);
286 #if !(IS_ENABLED(CONFIG_IPV6))
287 static inline void inet_sk_copy_descendant(struct sock *sk_to,
288 const struct sock *sk_from)
290 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
294 int inet_sk_rebuild_header(struct sock *sk);
296 static inline unsigned int __inet_ehashfn(const __be32 laddr,
302 return jhash_3words((__force __u32) laddr,
303 (__force __u32) faddr,
304 ((__u32) lport) << 16 | (__force __u32)fport,
308 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
309 struct sock *sk_listener,
310 bool attach_listener);
312 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
316 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
317 flags |= FLOWI_FLAG_ANYSRC;
321 static inline void inet_inc_convert_csum(struct sock *sk)
323 inet_sk(sk)->convert_csum++;
326 static inline void inet_dec_convert_csum(struct sock *sk)
328 if (inet_sk(sk)->convert_csum > 0)
329 inet_sk(sk)->convert_csum--;
332 static inline bool inet_get_convert_csum(struct sock *sk)
334 return !!inet_sk(sk)->convert_csum;
337 #endif /* _INET_SOCK_H */