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;
133 static inline int inet_sk_bound_l3mdev(const struct sock *sk)
135 #ifdef CONFIG_NET_L3_MASTER_DEV
136 struct net *net = sock_net(sk);
138 if (!net->ipv4.sysctl_tcp_l3mdev_accept)
139 return l3mdev_master_ifindex_by_index(net,
140 sk->sk_bound_dev_if);
146 static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
150 return !sdif || l3mdev_accept;
151 return bound_dev_if == dif || bound_dev_if == sdif;
157 struct ip_options *opt;
158 unsigned int fragsize;
159 int length; /* Total length of all frames */
160 struct dst_entry *dst;
169 struct inet_cork_full {
170 struct inet_cork base;
174 struct ip_mc_socklist;
178 /** struct inet_sock - representation of INET sockets
180 * @sk - ancestor class
181 * @pinet6 - pointer to IPv6 control block
182 * @inet_daddr - Foreign IPv4 addr
183 * @inet_rcv_saddr - Bound local IPv4 addr
184 * @inet_dport - Destination port
185 * @inet_num - Local port
186 * @inet_saddr - Sending source
187 * @uc_ttl - Unicast TTL
188 * @inet_sport - Source port
189 * @inet_id - ID counter for DF pkts
191 * @mc_ttl - Multicasting TTL
192 * @is_icsk - is this an inet_connection_sock?
193 * @uc_index - Unicast outgoing device index
194 * @mc_index - Multicast device index
195 * @mc_list - Group array
196 * @cork - info to build ip hdr on each ip frag while socket is corked
199 /* sk and pinet6 has to be the first two members of inet_sock */
201 #if IS_ENABLED(CONFIG_IPV6)
202 struct ipv6_pinfo *pinet6;
204 /* Socket demultiplex comparisons on incoming packets. */
205 #define inet_daddr sk.__sk_common.skc_daddr
206 #define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
207 #define inet_dport sk.__sk_common.skc_dport
208 #define inet_num sk.__sk_common.skc_num
216 struct ip_options_rcu __rcu *inet_opt;
230 __u8 bind_address_no_port:1,
231 defer_connect:1; /* Indicates that fastopen_connect is set
232 * and cookie exists so we defer connect
233 * until first data frame is written
240 struct ip_mc_socklist __rcu *mc_list;
241 struct inet_cork_full cork;
244 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
245 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
247 /* cmsg flags for inet */
248 #define IP_CMSG_PKTINFO BIT(0)
249 #define IP_CMSG_TTL BIT(1)
250 #define IP_CMSG_TOS BIT(2)
251 #define IP_CMSG_RECVOPTS BIT(3)
252 #define IP_CMSG_RETOPTS BIT(4)
253 #define IP_CMSG_PASSSEC BIT(5)
254 #define IP_CMSG_ORIGDSTADDR BIT(6)
255 #define IP_CMSG_CHECKSUM BIT(7)
256 #define IP_CMSG_RECVFRAGSIZE BIT(8)
259 * sk_to_full_sk - Access to a full socket
260 * @sk: pointer to a socket
262 * SYNACK messages might be attached to request sockets.
263 * Some places want to reach the listener in this case.
265 static inline struct sock *sk_to_full_sk(struct sock *sk)
268 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
269 sk = inet_reqsk(sk)->rsk_listener;
274 /* sk_to_full_sk() variant with a const argument */
275 static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
278 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
279 sk = ((const struct request_sock *)sk)->rsk_listener;
284 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
286 return sk_to_full_sk(skb->sk);
289 static inline struct inet_sock *inet_sk(const struct sock *sk)
291 return (struct inet_sock *)sk;
294 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
295 const struct sock *sk_from,
296 const int ancestor_size)
298 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
299 sk_from->sk_prot->obj_size - ancestor_size);
301 #if !(IS_ENABLED(CONFIG_IPV6))
302 static inline void inet_sk_copy_descendant(struct sock *sk_to,
303 const struct sock *sk_from)
305 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
309 int inet_sk_rebuild_header(struct sock *sk);
312 * inet_sk_state_load - read sk->sk_state for lockless contexts
313 * @sk: socket pointer
315 * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
316 * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
318 static inline int inet_sk_state_load(const struct sock *sk)
320 /* state change might impact lockless readers. */
321 return smp_load_acquire(&sk->sk_state);
325 * inet_sk_state_store - update sk->sk_state
326 * @sk: socket pointer
327 * @newstate: new state
329 * Paired with inet_sk_state_load(). Should be used in contexts where
330 * state change might impact lockless readers.
332 void inet_sk_state_store(struct sock *sk, int newstate);
334 void inet_sk_set_state(struct sock *sk, int state);
336 static inline unsigned int __inet_ehashfn(const __be32 laddr,
342 return jhash_3words((__force __u32) laddr,
343 (__force __u32) faddr,
344 ((__u32) lport) << 16 | (__force __u32)fport,
348 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
349 struct sock *sk_listener,
350 bool attach_listener);
352 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
356 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
357 flags |= FLOWI_FLAG_ANYSRC;
361 static inline void inet_inc_convert_csum(struct sock *sk)
363 inet_sk(sk)->convert_csum++;
366 static inline void inet_dec_convert_csum(struct sock *sk)
368 if (inet_sk(sk)->convert_csum > 0)
369 inet_sk(sk)->convert_csum--;
372 static inline bool inet_get_convert_csum(struct sock *sk)
374 return !!inet_sk(sk)->convert_csum;
378 static inline bool inet_can_nonlocal_bind(struct net *net,
379 struct inet_sock *inet)
381 return net->ipv4.sysctl_ip_nonlocal_bind ||
382 inet->freebind || inet->transparent;
385 #endif /* _INET_SOCK_H */