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TOMOYO Linux Cross Reference
Linux/include/linux/dccp.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_DCCP_H
  3 #define _LINUX_DCCP_H
  4 
  5 
  6 #include <linux/in.h>
  7 #include <linux/interrupt.h>
  8 #include <linux/ktime.h>
  9 #include <linux/list.h>
 10 #include <linux/uio.h>
 11 #include <linux/workqueue.h>
 12 
 13 #include <net/inet_connection_sock.h>
 14 #include <net/inet_sock.h>
 15 #include <net/inet_timewait_sock.h>
 16 #include <net/tcp_states.h>
 17 #include <uapi/linux/dccp.h>
 18 
 19 enum dccp_state {
 20         DCCP_OPEN            = TCP_ESTABLISHED,
 21         DCCP_REQUESTING      = TCP_SYN_SENT,
 22         DCCP_LISTEN          = TCP_LISTEN,
 23         DCCP_RESPOND         = TCP_SYN_RECV,
 24         /*
 25          * States involved in closing a DCCP connection:
 26          * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
 27          *
 28          * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
 29          *  a. Client has performed active-close, has sent a Close to the server
 30          *     from state OPEN or PARTOPEN, and is waiting for the final Reset
 31          *     (in this case, SOCK_DONE == 1).
 32          *  b. Client is asked to perform passive-close, by receiving a CloseReq
 33          *     in (PART)OPEN state. It sends a Close and waits for final Reset
 34          *     (in this case, SOCK_DONE == 0).
 35          *  c. Server performs an active-close as in (a), keeps TIMEWAIT state.
 36          *
 37          * 3) The following intermediate states are employed to give passively
 38          *    closing nodes a chance to process their unread data:
 39          *    - PASSIVE_CLOSE    (from OPEN => CLOSED) and
 40          *    - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
 41          */
 42         DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
 43         DCCP_PASSIVE_CLOSE   = TCP_CLOSE_WAIT,  /* any node receiving a Close */
 44         DCCP_CLOSING         = TCP_CLOSING,
 45         DCCP_TIME_WAIT       = TCP_TIME_WAIT,
 46         DCCP_CLOSED          = TCP_CLOSE,
 47         DCCP_NEW_SYN_RECV    = TCP_NEW_SYN_RECV,
 48         DCCP_PARTOPEN        = TCP_MAX_STATES,
 49         DCCP_PASSIVE_CLOSEREQ,                  /* clients receiving CloseReq */
 50         DCCP_MAX_STATES
 51 };
 52 
 53 enum {
 54         DCCPF_OPEN            = TCPF_ESTABLISHED,
 55         DCCPF_REQUESTING      = TCPF_SYN_SENT,
 56         DCCPF_LISTEN          = TCPF_LISTEN,
 57         DCCPF_RESPOND         = TCPF_SYN_RECV,
 58         DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
 59         DCCPF_CLOSING         = TCPF_CLOSING,
 60         DCCPF_TIME_WAIT       = TCPF_TIME_WAIT,
 61         DCCPF_CLOSED          = TCPF_CLOSE,
 62         DCCPF_NEW_SYN_RECV    = TCPF_NEW_SYN_RECV,
 63         DCCPF_PARTOPEN        = (1 << DCCP_PARTOPEN),
 64 };
 65 
 66 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
 67 {
 68         return (struct dccp_hdr *)skb_transport_header(skb);
 69 }
 70 
 71 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
 72 {
 73         skb_push(skb, headlen);
 74         skb_reset_transport_header(skb);
 75         return memset(skb_transport_header(skb), 0, headlen);
 76 }
 77 
 78 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
 79 {
 80         return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
 81 }
 82 
 83 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
 84 {
 85         return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
 86 }
 87 
 88 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
 89 {
 90         const struct dccp_hdr *dh = dccp_hdr(skb);
 91         return __dccp_basic_hdr_len(dh);
 92 }
 93 
 94 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
 95 {
 96         __u64 seq_nr =  ntohs(dh->dccph_seq);
 97 
 98         if (dh->dccph_x != 0)
 99                 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
100         else
101                 seq_nr += (u32)dh->dccph_seq2 << 16;
102 
103         return seq_nr;
104 }
105 
106 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
107 {
108         return (struct dccp_hdr_request *)(skb_transport_header(skb) +
109                                            dccp_basic_hdr_len(skb));
110 }
111 
112 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
113 {
114         return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
115                                             dccp_basic_hdr_len(skb));
116 }
117 
118 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
119 {
120         const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
121         return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
122 }
123 
124 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
125 {
126         return (struct dccp_hdr_response *)(skb_transport_header(skb) +
127                                             dccp_basic_hdr_len(skb));
128 }
129 
130 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
131 {
132         return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
133                                          dccp_basic_hdr_len(skb));
134 }
135 
136 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
137 {
138         return __dccp_basic_hdr_len(dh) +
139                dccp_packet_hdr_len(dh->dccph_type);
140 }
141 
142 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
143 {
144         return __dccp_hdr_len(dccp_hdr(skb));
145 }
146 
147 /**
148  * struct dccp_request_sock  -  represent DCCP-specific connection request
149  * @dreq_inet_rsk: structure inherited from
150  * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
151  * @dreq_gss: greatest sequence number sent (for retransmitted Responses)
152  * @dreq_isr: initial sequence number received in the first Request
153  * @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
154  * @dreq_service: service code present on the Request (there is just one)
155  * @dreq_featneg: feature negotiation options for this connection
156  * The following two fields are analogous to the ones in dccp_sock:
157  * @dreq_timestamp_echo: last received timestamp to echo (13.1)
158  * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
159  */
160 struct dccp_request_sock {
161         struct inet_request_sock dreq_inet_rsk;
162         __u64                    dreq_iss;
163         __u64                    dreq_gss;
164         __u64                    dreq_isr;
165         __u64                    dreq_gsr;
166         __be32                   dreq_service;
167         spinlock_t               dreq_lock;
168         struct list_head         dreq_featneg;
169         __u32                    dreq_timestamp_echo;
170         __u32                    dreq_timestamp_time;
171 };
172 
173 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
174 {
175         return (struct dccp_request_sock *)req;
176 }
177 
178 extern struct inet_timewait_death_row dccp_death_row;
179 
180 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
181                               struct sk_buff *skb);
182 
183 struct dccp_options_received {
184         u64     dccpor_ndp:48;
185         u32     dccpor_timestamp;
186         u32     dccpor_timestamp_echo;
187         u32     dccpor_elapsed_time;
188 };
189 
190 struct ccid;
191 
192 enum dccp_role {
193         DCCP_ROLE_UNDEFINED,
194         DCCP_ROLE_LISTEN,
195         DCCP_ROLE_CLIENT,
196         DCCP_ROLE_SERVER,
197 };
198 
199 struct dccp_service_list {
200         __u32   dccpsl_nr;
201         __be32  dccpsl_list[0];
202 };
203 
204 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
205 #define DCCP_SERVICE_CODE_IS_ABSENT             0
206 
207 static inline bool dccp_list_has_service(const struct dccp_service_list *sl,
208                                         const __be32 service)
209 {
210         if (likely(sl != NULL)) {
211                 u32 i = sl->dccpsl_nr;
212                 while (i--)
213                         if (sl->dccpsl_list[i] == service)
214                                 return true;
215         }
216         return false;
217 }
218 
219 struct dccp_ackvec;
220 
221 /**
222  * struct dccp_sock - DCCP socket state
223  *
224  * @dccps_swl - sequence number window low
225  * @dccps_swh - sequence number window high
226  * @dccps_awl - acknowledgement number window low
227  * @dccps_awh - acknowledgement number window high
228  * @dccps_iss - initial sequence number sent
229  * @dccps_isr - initial sequence number received
230  * @dccps_osr - first OPEN sequence number received
231  * @dccps_gss - greatest sequence number sent
232  * @dccps_gsr - greatest valid sequence number received
233  * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
234  * @dccps_service - first (passive sock) or unique (active sock) service code
235  * @dccps_service_list - second .. last service code on passive socket
236  * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
237  * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
238  * @dccps_l_ack_ratio - feature-local Ack Ratio
239  * @dccps_r_ack_ratio - feature-remote Ack Ratio
240  * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
241  * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
242  * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
243  * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
244  * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
245  * @dccps_ndp_count - number of Non Data Packets since last data packet
246  * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
247  * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
248  * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
249  * @dccps_hc_rx_ackvec - rx half connection ack vector
250  * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
251  * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
252  * @dccps_options_received - parsed set of retrieved options
253  * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
254  * @dccps_tx_qlen - maximum length of the TX queue
255  * @dccps_role - role of this sock, one of %dccp_role
256  * @dccps_hc_rx_insert_options - receiver wants to add options when acking
257  * @dccps_hc_tx_insert_options - sender wants to add options when sending
258  * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
259  * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
260  * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
261  * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
262  * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
263  */
264 struct dccp_sock {
265         /* inet_connection_sock has to be the first member of dccp_sock */
266         struct inet_connection_sock     dccps_inet_connection;
267 #define dccps_syn_rtt                   dccps_inet_connection.icsk_ack.lrcvtime
268         __u64                           dccps_swl;
269         __u64                           dccps_swh;
270         __u64                           dccps_awl;
271         __u64                           dccps_awh;
272         __u64                           dccps_iss;
273         __u64                           dccps_isr;
274         __u64                           dccps_osr;
275         __u64                           dccps_gss;
276         __u64                           dccps_gsr;
277         __u64                           dccps_gar;
278         __be32                          dccps_service;
279         __u32                           dccps_mss_cache;
280         struct dccp_service_list        *dccps_service_list;
281         __u32                           dccps_timestamp_echo;
282         __u32                           dccps_timestamp_time;
283         __u16                           dccps_l_ack_ratio;
284         __u16                           dccps_r_ack_ratio;
285         __u64                           dccps_l_seq_win:48;
286         __u64                           dccps_r_seq_win:48;
287         __u8                            dccps_pcslen:4;
288         __u8                            dccps_pcrlen:4;
289         __u8                            dccps_send_ndp_count:1;
290         __u64                           dccps_ndp_count:48;
291         unsigned long                   dccps_rate_last;
292         struct list_head                dccps_featneg;
293         struct dccp_ackvec              *dccps_hc_rx_ackvec;
294         struct ccid                     *dccps_hc_rx_ccid;
295         struct ccid                     *dccps_hc_tx_ccid;
296         struct dccp_options_received    dccps_options_received;
297         __u8                            dccps_qpolicy;
298         __u32                           dccps_tx_qlen;
299         enum dccp_role                  dccps_role:2;
300         __u8                            dccps_hc_rx_insert_options:1;
301         __u8                            dccps_hc_tx_insert_options:1;
302         __u8                            dccps_server_timewait:1;
303         __u8                            dccps_sync_scheduled:1;
304         struct tasklet_struct           dccps_xmitlet;
305         struct timer_list               dccps_xmit_timer;
306 };
307 
308 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
309 {
310         return (struct dccp_sock *)sk;
311 }
312 
313 static inline const char *dccp_role(const struct sock *sk)
314 {
315         switch (dccp_sk(sk)->dccps_role) {
316         case DCCP_ROLE_UNDEFINED: return "undefined";
317         case DCCP_ROLE_LISTEN:    return "listen";
318         case DCCP_ROLE_SERVER:    return "server";
319         case DCCP_ROLE_CLIENT:    return "client";
320         }
321         return NULL;
322 }
323 
324 extern void dccp_syn_ack_timeout(const struct request_sock *req);
325 
326 #endif /* _LINUX_DCCP_H */
327 

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