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TOMOYO Linux Cross Reference
Linux/include/net/inet_sock.h

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  1 /*
  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.
  5  *
  6  *              Definitions for inet_sock
  7  *
  8  * Authors:     Many, reorganised here by
  9  *              Arnaldo Carvalho de Melo <acme@mandriva.com>
 10  *
 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.
 15  */
 16 #ifndef _INET_SOCK_H
 17 #define _INET_SOCK_H
 18 
 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>
 24 
 25 #include <net/flow.h>
 26 #include <net/sock.h>
 27 #include <net/request_sock.h>
 28 #include <net/netns/hash.h>
 29 #include <net/tcp_states.h>
 30 #include <net/l3mdev.h>
 31 
 32 /** struct ip_options - IP Options
 33  *
 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
 42  */
 43 struct ip_options {
 44         __be32          faddr;
 45         __be32          nexthop;
 46         unsigned char   optlen;
 47         unsigned char   srr;
 48         unsigned char   rr;
 49         unsigned char   ts;
 50         unsigned char   is_strictroute:1,
 51                         srr_is_hit:1,
 52                         is_changed:1,
 53                         rr_needaddr:1,
 54                         ts_needtime:1,
 55                         ts_needaddr:1;
 56         unsigned char   router_alert;
 57         unsigned char   cipso;
 58         unsigned char   __pad2;
 59         unsigned char   __data[0];
 60 };
 61 
 62 struct ip_options_rcu {
 63         struct rcu_head rcu;
 64         struct ip_options opt;
 65 };
 66 
 67 struct ip_options_data {
 68         struct ip_options_rcu   opt;
 69         char                    data[40];
 70 };
 71 
 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
 85 
 86         u16                     snd_wscale : 4,
 87                                 rcv_wscale : 4,
 88                                 tstamp_ok  : 1,
 89                                 sack_ok    : 1,
 90                                 wscale_ok  : 1,
 91                                 ecn_ok     : 1,
 92                                 acked      : 1,
 93                                 no_srccheck: 1,
 94                                 smc_ok     : 1;
 95         u32                     ir_mark;
 96         union {
 97                 struct ip_options_rcu __rcu     *ireq_opt;
 98 #if IS_ENABLED(CONFIG_IPV6)
 99                 struct {
100                         struct ipv6_txoptions   *ipv6_opt;
101                         struct sk_buff          *pktopts;
102                 };
103 #endif
104         };
105 };
106 
107 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
108 {
109         return (struct inet_request_sock *)sk;
110 }
111 
112 static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
113 {
114         if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
115                 return skb->mark;
116 
117         return sk->sk_mark;
118 }
119 
120 static inline int inet_request_bound_dev_if(const struct sock *sk,
121                                             struct sk_buff *skb)
122 {
123 #ifdef CONFIG_NET_L3_MASTER_DEV
124         struct net *net = sock_net(sk);
125 
126         if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
127                 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
128 #endif
129 
130         return sk->sk_bound_dev_if;
131 }
132 
133 static inline int inet_sk_bound_l3mdev(const struct sock *sk)
134 {
135 #ifdef CONFIG_NET_L3_MASTER_DEV
136         struct net *net = sock_net(sk);
137 
138         if (!net->ipv4.sysctl_tcp_l3mdev_accept)
139                 return l3mdev_master_ifindex_by_index(net,
140                                                       sk->sk_bound_dev_if);
141 #endif
142 
143         return 0;
144 }
145 
146 static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
147                                      int dif, int sdif)
148 {
149         if (!bound_dev_if)
150                 return !sdif || l3mdev_accept;
151         return bound_dev_if == dif || bound_dev_if == sdif;
152 }
153 
154 struct inet_cork {
155         unsigned int            flags;
156         __be32                  addr;
157         struct ip_options       *opt;
158         unsigned int            fragsize;
159         int                     length; /* Total length of all frames */
160         struct dst_entry        *dst;
161         u8                      tx_flags;
162         __u8                    ttl;
163         __s16                   tos;
164         char                    priority;
165         __u16                   gso_size;
166         u64                     transmit_time;
167 };
168 
169 struct inet_cork_full {
170         struct inet_cork        base;
171         struct flowi            fl;
172 };
173 
174 struct ip_mc_socklist;
175 struct ipv6_pinfo;
176 struct rtable;
177 
178 /** struct inet_sock - representation of INET sockets
179  *
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
190  * @tos - TOS
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
197  */
198 struct inet_sock {
199         /* sk and pinet6 has to be the first two members of inet_sock */
200         struct sock             sk;
201 #if IS_ENABLED(CONFIG_IPV6)
202         struct ipv6_pinfo       *pinet6;
203 #endif
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
209 
210         __be32                  inet_saddr;
211         __s16                   uc_ttl;
212         __u16                   cmsg_flags;
213         __be16                  inet_sport;
214         __u16                   inet_id;
215 
216         struct ip_options_rcu __rcu     *inet_opt;
217         int                     rx_dst_ifindex;
218         __u8                    tos;
219         __u8                    min_ttl;
220         __u8                    mc_ttl;
221         __u8                    pmtudisc;
222         __u8                    recverr:1,
223                                 is_icsk:1,
224                                 freebind:1,
225                                 hdrincl:1,
226                                 mc_loop:1,
227                                 transparent:1,
228                                 mc_all:1,
229                                 nodefrag:1;
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
234                                                   */
235         __u8                    rcv_tos;
236         __u8                    convert_csum;
237         int                     uc_index;
238         int                     mc_index;
239         __be32                  mc_addr;
240         struct ip_mc_socklist __rcu     *mc_list;
241         struct inet_cork_full   cork;
242 };
243 
244 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
245 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
246 
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)
257 
258 /**
259  * sk_to_full_sk - Access to a full socket
260  * @sk: pointer to a socket
261  *
262  * SYNACK messages might be attached to request sockets.
263  * Some places want to reach the listener in this case.
264  */
265 static inline struct sock *sk_to_full_sk(struct sock *sk)
266 {
267 #ifdef CONFIG_INET
268         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
269                 sk = inet_reqsk(sk)->rsk_listener;
270 #endif
271         return sk;
272 }
273 
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)
276 {
277 #ifdef CONFIG_INET
278         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
279                 sk = ((const struct request_sock *)sk)->rsk_listener;
280 #endif
281         return sk;
282 }
283 
284 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
285 {
286         return sk_to_full_sk(skb->sk);
287 }
288 
289 static inline struct inet_sock *inet_sk(const struct sock *sk)
290 {
291         return (struct inet_sock *)sk;
292 }
293 
294 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
295                                              const struct sock *sk_from,
296                                              const int ancestor_size)
297 {
298         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
299                sk_from->sk_prot->obj_size - ancestor_size);
300 }
301 #if !(IS_ENABLED(CONFIG_IPV6))
302 static inline void inet_sk_copy_descendant(struct sock *sk_to,
303                                            const struct sock *sk_from)
304 {
305         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
306 }
307 #endif
308 
309 int inet_sk_rebuild_header(struct sock *sk);
310 
311 /**
312  * inet_sk_state_load - read sk->sk_state for lockless contexts
313  * @sk: socket pointer
314  *
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() ...
317  */
318 static inline int inet_sk_state_load(const struct sock *sk)
319 {
320         /* state change might impact lockless readers. */
321         return smp_load_acquire(&sk->sk_state);
322 }
323 
324 /**
325  * inet_sk_state_store - update sk->sk_state
326  * @sk: socket pointer
327  * @newstate: new state
328  *
329  * Paired with inet_sk_state_load(). Should be used in contexts where
330  * state change might impact lockless readers.
331  */
332 void inet_sk_state_store(struct sock *sk, int newstate);
333 
334 void inet_sk_set_state(struct sock *sk, int state);
335 
336 static inline unsigned int __inet_ehashfn(const __be32 laddr,
337                                           const __u16 lport,
338                                           const __be32 faddr,
339                                           const __be16 fport,
340                                           u32 initval)
341 {
342         return jhash_3words((__force __u32) laddr,
343                             (__force __u32) faddr,
344                             ((__u32) lport) << 16 | (__force __u32)fport,
345                             initval);
346 }
347 
348 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
349                                       struct sock *sk_listener,
350                                       bool attach_listener);
351 
352 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
353 {
354         __u8 flags = 0;
355 
356         if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
357                 flags |= FLOWI_FLAG_ANYSRC;
358         return flags;
359 }
360 
361 static inline void inet_inc_convert_csum(struct sock *sk)
362 {
363         inet_sk(sk)->convert_csum++;
364 }
365 
366 static inline void inet_dec_convert_csum(struct sock *sk)
367 {
368         if (inet_sk(sk)->convert_csum > 0)
369                 inet_sk(sk)->convert_csum--;
370 }
371 
372 static inline bool inet_get_convert_csum(struct sock *sk)
373 {
374         return !!inet_sk(sk)->convert_csum;
375 }
376 
377 
378 static inline bool inet_can_nonlocal_bind(struct net *net,
379                                           struct inet_sock *inet)
380 {
381         return net->ipv4.sysctl_ip_nonlocal_bind ||
382                 inet->freebind || inet->transparent;
383 }
384 
385 #endif  /* _INET_SOCK_H */
386 

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