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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 struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq)
134 {
135         return rcu_dereference_check(ireq->ireq_opt,
136                                      refcount_read(&ireq->req.rsk_refcnt) > 0);
137 }
138 
139 struct inet_cork {
140         unsigned int            flags;
141         __be32                  addr;
142         struct ip_options       *opt;
143         unsigned int            fragsize;
144         int                     length; /* Total length of all frames */
145         struct dst_entry        *dst;
146         u8                      tx_flags;
147         __u8                    ttl;
148         __s16                   tos;
149         char                    priority;
150 };
151 
152 struct inet_cork_full {
153         struct inet_cork        base;
154         struct flowi            fl;
155 };
156 
157 struct ip_mc_socklist;
158 struct ipv6_pinfo;
159 struct rtable;
160 
161 /** struct inet_sock - representation of INET sockets
162  *
163  * @sk - ancestor class
164  * @pinet6 - pointer to IPv6 control block
165  * @inet_daddr - Foreign IPv4 addr
166  * @inet_rcv_saddr - Bound local IPv4 addr
167  * @inet_dport - Destination port
168  * @inet_num - Local port
169  * @inet_saddr - Sending source
170  * @uc_ttl - Unicast TTL
171  * @inet_sport - Source port
172  * @inet_id - ID counter for DF pkts
173  * @tos - TOS
174  * @mc_ttl - Multicasting TTL
175  * @is_icsk - is this an inet_connection_sock?
176  * @uc_index - Unicast outgoing device index
177  * @mc_index - Multicast device index
178  * @mc_list - Group array
179  * @cork - info to build ip hdr on each ip frag while socket is corked
180  */
181 struct inet_sock {
182         /* sk and pinet6 has to be the first two members of inet_sock */
183         struct sock             sk;
184 #if IS_ENABLED(CONFIG_IPV6)
185         struct ipv6_pinfo       *pinet6;
186 #endif
187         /* Socket demultiplex comparisons on incoming packets. */
188 #define inet_daddr              sk.__sk_common.skc_daddr
189 #define inet_rcv_saddr          sk.__sk_common.skc_rcv_saddr
190 #define inet_dport              sk.__sk_common.skc_dport
191 #define inet_num                sk.__sk_common.skc_num
192 
193         __be32                  inet_saddr;
194         __s16                   uc_ttl;
195         __u16                   cmsg_flags;
196         __be16                  inet_sport;
197         __u16                   inet_id;
198 
199         struct ip_options_rcu __rcu     *inet_opt;
200         int                     rx_dst_ifindex;
201         __u8                    tos;
202         __u8                    min_ttl;
203         __u8                    mc_ttl;
204         __u8                    pmtudisc;
205         __u8                    recverr:1,
206                                 is_icsk:1,
207                                 freebind:1,
208                                 hdrincl:1,
209                                 mc_loop:1,
210                                 transparent:1,
211                                 mc_all:1,
212                                 nodefrag:1;
213         __u8                    bind_address_no_port:1,
214                                 defer_connect:1; /* Indicates that fastopen_connect is set
215                                                   * and cookie exists so we defer connect
216                                                   * until first data frame is written
217                                                   */
218         __u8                    rcv_tos;
219         __u8                    convert_csum;
220         int                     uc_index;
221         int                     mc_index;
222         __be32                  mc_addr;
223         struct ip_mc_socklist __rcu     *mc_list;
224         struct inet_cork_full   cork;
225 };
226 
227 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
228 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
229 
230 /* cmsg flags for inet */
231 #define IP_CMSG_PKTINFO         BIT(0)
232 #define IP_CMSG_TTL             BIT(1)
233 #define IP_CMSG_TOS             BIT(2)
234 #define IP_CMSG_RECVOPTS        BIT(3)
235 #define IP_CMSG_RETOPTS         BIT(4)
236 #define IP_CMSG_PASSSEC         BIT(5)
237 #define IP_CMSG_ORIGDSTADDR     BIT(6)
238 #define IP_CMSG_CHECKSUM        BIT(7)
239 #define IP_CMSG_RECVFRAGSIZE    BIT(8)
240 
241 /**
242  * sk_to_full_sk - Access to a full socket
243  * @sk: pointer to a socket
244  *
245  * SYNACK messages might be attached to request sockets.
246  * Some places want to reach the listener in this case.
247  */
248 static inline struct sock *sk_to_full_sk(struct sock *sk)
249 {
250 #ifdef CONFIG_INET
251         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
252                 sk = inet_reqsk(sk)->rsk_listener;
253 #endif
254         return sk;
255 }
256 
257 /* sk_to_full_sk() variant with a const argument */
258 static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
259 {
260 #ifdef CONFIG_INET
261         if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
262                 sk = ((const struct request_sock *)sk)->rsk_listener;
263 #endif
264         return sk;
265 }
266 
267 static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
268 {
269         return sk_to_full_sk(skb->sk);
270 }
271 
272 static inline struct inet_sock *inet_sk(const struct sock *sk)
273 {
274         return (struct inet_sock *)sk;
275 }
276 
277 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
278                                              const struct sock *sk_from,
279                                              const int ancestor_size)
280 {
281         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
282                sk_from->sk_prot->obj_size - ancestor_size);
283 }
284 #if !(IS_ENABLED(CONFIG_IPV6))
285 static inline void inet_sk_copy_descendant(struct sock *sk_to,
286                                            const struct sock *sk_from)
287 {
288         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
289 }
290 #endif
291 
292 int inet_sk_rebuild_header(struct sock *sk);
293 
294 static inline unsigned int __inet_ehashfn(const __be32 laddr,
295                                           const __u16 lport,
296                                           const __be32 faddr,
297                                           const __be16 fport,
298                                           u32 initval)
299 {
300         return jhash_3words((__force __u32) laddr,
301                             (__force __u32) faddr,
302                             ((__u32) lport) << 16 | (__force __u32)fport,
303                             initval);
304 }
305 
306 struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
307                                       struct sock *sk_listener,
308                                       bool attach_listener);
309 
310 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
311 {
312         __u8 flags = 0;
313 
314         if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
315                 flags |= FLOWI_FLAG_ANYSRC;
316         return flags;
317 }
318 
319 static inline void inet_inc_convert_csum(struct sock *sk)
320 {
321         inet_sk(sk)->convert_csum++;
322 }
323 
324 static inline void inet_dec_convert_csum(struct sock *sk)
325 {
326         if (inet_sk(sk)->convert_csum > 0)
327                 inet_sk(sk)->convert_csum--;
328 }
329 
330 static inline bool inet_get_convert_csum(struct sock *sk)
331 {
332         return !!inet_sk(sk)->convert_csum;
333 }
334 
335 #endif  /* _INET_SOCK_H */
336 

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