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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 
 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>
 25 
 26 #include <net/flow.h>
 27 #include <net/sock.h>
 28 #include <net/request_sock.h>
 29 #include <net/netns/hash.h>
 30 
 31 /** struct ip_options - IP Options
 32  *
 33  * @faddr - Saved first hop address
 34  * @nexthop - Saved nexthop address in LSRR and SSRR
 35  * @is_strictroute - Strict source route
 36  * @srr_is_hit - Packet destination addr was our one
 37  * @is_changed - IP checksum more not valid
 38  * @rr_needaddr - Need to record addr of outgoing dev
 39  * @ts_needtime - Need to record timestamp
 40  * @ts_needaddr - Need to record addr of outgoing dev
 41  */
 42 struct ip_options {
 43         __be32          faddr;
 44         __be32          nexthop;
 45         unsigned char   optlen;
 46         unsigned char   srr;
 47         unsigned char   rr;
 48         unsigned char   ts;
 49         unsigned char   is_strictroute:1,
 50                         srr_is_hit:1,
 51                         is_changed:1,
 52                         rr_needaddr:1,
 53                         ts_needtime:1,
 54                         ts_needaddr:1;
 55         unsigned char   router_alert;
 56         unsigned char   cipso;
 57         unsigned char   __pad2;
 58         unsigned char   __data[0];
 59 };
 60 
 61 struct ip_options_rcu {
 62         struct rcu_head rcu;
 63         struct ip_options opt;
 64 };
 65 
 66 struct ip_options_data {
 67         struct ip_options_rcu   opt;
 68         char                    data[40];
 69 };
 70 
 71 struct inet_request_sock {
 72         struct request_sock     req;
 73 #if IS_ENABLED(CONFIG_IPV6)
 74         u16                     inet6_rsk_offset;
 75 #endif
 76         __be16                  loc_port;
 77         __be32                  loc_addr;
 78         __be32                  rmt_addr;
 79         __be16                  rmt_port;
 80         kmemcheck_bitfield_begin(flags);
 81         u16                     snd_wscale : 4,
 82                                 rcv_wscale : 4,
 83                                 tstamp_ok  : 1,
 84                                 sack_ok    : 1,
 85                                 wscale_ok  : 1,
 86                                 ecn_ok     : 1,
 87                                 acked      : 1,
 88                                 no_srccheck: 1;
 89         kmemcheck_bitfield_end(flags);
 90         struct ip_options_rcu   *opt;
 91 };
 92 
 93 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
 94 {
 95         return (struct inet_request_sock *)sk;
 96 }
 97 
 98 struct inet_cork {
 99         unsigned int            flags;
100         __be32                  addr;
101         struct ip_options       *opt;
102         unsigned int            fragsize;
103         int                     length; /* Total length of all frames */
104         struct dst_entry        *dst;
105         u8                      tx_flags;
106 };
107 
108 struct inet_cork_full {
109         struct inet_cork        base;
110         struct flowi            fl;
111 };
112 
113 struct ip_mc_socklist;
114 struct ipv6_pinfo;
115 struct rtable;
116 
117 /** struct inet_sock - representation of INET sockets
118  *
119  * @sk - ancestor class
120  * @pinet6 - pointer to IPv6 control block
121  * @inet_daddr - Foreign IPv4 addr
122  * @inet_rcv_saddr - Bound local IPv4 addr
123  * @inet_dport - Destination port
124  * @inet_num - Local port
125  * @inet_saddr - Sending source
126  * @uc_ttl - Unicast TTL
127  * @inet_sport - Source port
128  * @inet_id - ID counter for DF pkts
129  * @tos - TOS
130  * @mc_ttl - Multicasting TTL
131  * @is_icsk - is this an inet_connection_sock?
132  * @uc_index - Unicast outgoing device index
133  * @mc_index - Multicast device index
134  * @mc_list - Group array
135  * @cork - info to build ip hdr on each ip frag while socket is corked
136  */
137 struct inet_sock {
138         /* sk and pinet6 has to be the first two members of inet_sock */
139         struct sock             sk;
140 #if IS_ENABLED(CONFIG_IPV6)
141         struct ipv6_pinfo       *pinet6;
142 #endif
143         /* Socket demultiplex comparisons on incoming packets. */
144 #define inet_daddr              sk.__sk_common.skc_daddr
145 #define inet_rcv_saddr          sk.__sk_common.skc_rcv_saddr
146 #define inet_addrpair           sk.__sk_common.skc_addrpair
147 #define inet_dport              sk.__sk_common.skc_dport
148 #define inet_num                sk.__sk_common.skc_num
149 #define inet_portpair           sk.__sk_common.skc_portpair
150 
151         __be32                  inet_saddr;
152         __s16                   uc_ttl;
153         __u16                   cmsg_flags;
154         __be16                  inet_sport;
155         __u16                   inet_id;
156 
157         struct ip_options_rcu __rcu     *inet_opt;
158         int                     rx_dst_ifindex;
159         __u8                    tos;
160         __u8                    min_ttl;
161         __u8                    mc_ttl;
162         __u8                    pmtudisc;
163         __u8                    recverr:1,
164                                 is_icsk:1,
165                                 freebind:1,
166                                 hdrincl:1,
167                                 mc_loop:1,
168                                 transparent:1,
169                                 mc_all:1,
170                                 nodefrag:1;
171         __u8                    rcv_tos;
172         int                     uc_index;
173         int                     mc_index;
174         __be32                  mc_addr;
175         struct ip_mc_socklist __rcu     *mc_list;
176         struct inet_cork_full   cork;
177 };
178 
179 #define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
180 #define IPCORK_ALLFRAG  2       /* always fragment (for ipv6 for now) */
181 
182 static inline struct inet_sock *inet_sk(const struct sock *sk)
183 {
184         return (struct inet_sock *)sk;
185 }
186 
187 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
188                                              const struct sock *sk_from,
189                                              const int ancestor_size)
190 {
191         memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
192                sk_from->sk_prot->obj_size - ancestor_size);
193 }
194 #if !(IS_ENABLED(CONFIG_IPV6))
195 static inline void inet_sk_copy_descendant(struct sock *sk_to,
196                                            const struct sock *sk_from)
197 {
198         __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
199 }
200 #endif
201 
202 extern int inet_sk_rebuild_header(struct sock *sk);
203 
204 extern u32 inet_ehash_secret;
205 extern u32 ipv6_hash_secret;
206 extern void build_ehash_secret(void);
207 
208 static inline unsigned int inet_ehashfn(struct net *net,
209                                         const __be32 laddr, const __u16 lport,
210                                         const __be32 faddr, const __be16 fport)
211 {
212         return jhash_3words((__force __u32) laddr,
213                             (__force __u32) faddr,
214                             ((__u32) lport) << 16 | (__force __u32)fport,
215                             inet_ehash_secret + net_hash_mix(net));
216 }
217 
218 static inline int inet_sk_ehashfn(const struct sock *sk)
219 {
220         const struct inet_sock *inet = inet_sk(sk);
221         const __be32 laddr = inet->inet_rcv_saddr;
222         const __u16 lport = inet->inet_num;
223         const __be32 faddr = inet->inet_daddr;
224         const __be16 fport = inet->inet_dport;
225         struct net *net = sock_net(sk);
226 
227         return inet_ehashfn(net, laddr, lport, faddr, fport);
228 }
229 
230 static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
231 {
232         struct request_sock *req = reqsk_alloc(ops);
233         struct inet_request_sock *ireq = inet_rsk(req);
234 
235         if (req != NULL) {
236                 kmemcheck_annotate_bitfield(ireq, flags);
237                 ireq->opt = NULL;
238         }
239 
240         return req;
241 }
242 
243 static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
244 {
245         __u8 flags = 0;
246 
247         if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
248                 flags |= FLOWI_FLAG_ANYSRC;
249         return flags;
250 }
251 
252 #endif  /* _INET_SOCK_H */
253 

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