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