video: tegra: host: refactor for upstreaming
[linux-2.6.git] / include / linux / dccp.h
1 #ifndef _LINUX_DCCP_H
2 #define _LINUX_DCCP_H
3
4 #include <linux/types.h>
5 #include <asm/byteorder.h>
6
7 /**
8  * struct dccp_hdr - generic part of DCCP packet header
9  *
10  * @dccph_sport - Relevant port on the endpoint that sent this packet
11  * @dccph_dport - Relevant port on the other endpoint
12  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
13  * @dccph_ccval - Used by the HC-Sender CCID
14  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
15  * @dccph_checksum - Internet checksum, depends on dccph_cscov
16  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
17  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
18  * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
19  */
20 struct dccp_hdr {
21         __be16  dccph_sport,
22                 dccph_dport;
23         __u8    dccph_doff;
24 #if defined(__LITTLE_ENDIAN_BITFIELD)
25         __u8    dccph_cscov:4,
26                 dccph_ccval:4;
27 #elif defined(__BIG_ENDIAN_BITFIELD)
28         __u8    dccph_ccval:4,
29                 dccph_cscov:4;
30 #else
31 #error  "Adjust your <asm/byteorder.h> defines"
32 #endif
33         __sum16 dccph_checksum;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
35         __u8    dccph_x:1,
36                 dccph_type:4,
37                 dccph_reserved:3;
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39         __u8    dccph_reserved:3,
40                 dccph_type:4,
41                 dccph_x:1;
42 #else
43 #error  "Adjust your <asm/byteorder.h> defines"
44 #endif
45         __u8    dccph_seq2;
46         __be16  dccph_seq;
47 };
48
49 /**
50  * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
51  *
52  * @dccph_seq_low - low 24 bits of a 48 bit seq packet
53  */
54 struct dccp_hdr_ext {
55         __be32  dccph_seq_low;
56 };
57
58 /**
59  * struct dccp_hdr_request - Connection initiation request header
60  *
61  * @dccph_req_service - Service to which the client app wants to connect
62  */
63 struct dccp_hdr_request {
64         __be32  dccph_req_service;
65 };
66 /**
67  * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
68  *
69  * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
70  * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
71  */
72 struct dccp_hdr_ack_bits {
73         __be16  dccph_reserved1;
74         __be16  dccph_ack_nr_high;
75         __be32  dccph_ack_nr_low;
76 };
77 /**
78  * struct dccp_hdr_response - Connection initiation response header
79  *
80  * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
81  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
82  */
83 struct dccp_hdr_response {
84         struct dccp_hdr_ack_bits        dccph_resp_ack;
85         __be32                          dccph_resp_service;
86 };
87
88 /**
89  * struct dccp_hdr_reset - Unconditionally shut down a connection
90  *
91  * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6)
92  * @dccph_reset_code - one of %dccp_reset_codes
93  * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
94  */
95 struct dccp_hdr_reset {
96         struct dccp_hdr_ack_bits        dccph_reset_ack;
97         __u8                            dccph_reset_code,
98                                         dccph_reset_data[3];
99 };
100
101 enum dccp_pkt_type {
102         DCCP_PKT_REQUEST = 0,
103         DCCP_PKT_RESPONSE,
104         DCCP_PKT_DATA,
105         DCCP_PKT_ACK,
106         DCCP_PKT_DATAACK,
107         DCCP_PKT_CLOSEREQ,
108         DCCP_PKT_CLOSE,
109         DCCP_PKT_RESET,
110         DCCP_PKT_SYNC,
111         DCCP_PKT_SYNCACK,
112         DCCP_PKT_INVALID,
113 };
114
115 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
116
117 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
118 {
119         if (type == DCCP_PKT_DATA)
120                 return 0;
121         if (type == DCCP_PKT_DATAACK    ||
122             type == DCCP_PKT_ACK        ||
123             type == DCCP_PKT_SYNC       ||
124             type == DCCP_PKT_SYNCACK    ||
125             type == DCCP_PKT_CLOSE      ||
126             type == DCCP_PKT_CLOSEREQ)
127                 return sizeof(struct dccp_hdr_ack_bits);
128         if (type == DCCP_PKT_REQUEST)
129                 return sizeof(struct dccp_hdr_request);
130         if (type == DCCP_PKT_RESPONSE)
131                 return sizeof(struct dccp_hdr_response);
132         return sizeof(struct dccp_hdr_reset);
133 }
134 enum dccp_reset_codes {
135         DCCP_RESET_CODE_UNSPECIFIED = 0,
136         DCCP_RESET_CODE_CLOSED,
137         DCCP_RESET_CODE_ABORTED,
138         DCCP_RESET_CODE_NO_CONNECTION,
139         DCCP_RESET_CODE_PACKET_ERROR,
140         DCCP_RESET_CODE_OPTION_ERROR,
141         DCCP_RESET_CODE_MANDATORY_ERROR,
142         DCCP_RESET_CODE_CONNECTION_REFUSED,
143         DCCP_RESET_CODE_BAD_SERVICE_CODE,
144         DCCP_RESET_CODE_TOO_BUSY,
145         DCCP_RESET_CODE_BAD_INIT_COOKIE,
146         DCCP_RESET_CODE_AGGRESSION_PENALTY,
147
148         DCCP_MAX_RESET_CODES            /* Leave at the end!  */
149 };
150
151 /* DCCP options */
152 enum {
153         DCCPO_PADDING = 0,
154         DCCPO_MANDATORY = 1,
155         DCCPO_MIN_RESERVED = 3,
156         DCCPO_MAX_RESERVED = 31,
157         DCCPO_CHANGE_L = 32,
158         DCCPO_CONFIRM_L = 33,
159         DCCPO_CHANGE_R = 34,
160         DCCPO_CONFIRM_R = 35,
161         DCCPO_NDP_COUNT = 37,
162         DCCPO_ACK_VECTOR_0 = 38,
163         DCCPO_ACK_VECTOR_1 = 39,
164         DCCPO_TIMESTAMP = 41,
165         DCCPO_TIMESTAMP_ECHO = 42,
166         DCCPO_ELAPSED_TIME = 43,
167         DCCPO_MAX = 45,
168         DCCPO_MIN_RX_CCID_SPECIFIC = 128,       /* from sender to receiver */
169         DCCPO_MAX_RX_CCID_SPECIFIC = 191,
170         DCCPO_MIN_TX_CCID_SPECIFIC = 192,       /* from receiver to sender */
171         DCCPO_MAX_TX_CCID_SPECIFIC = 255,
172 };
173 /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174 #define DCCP_SINGLE_OPT_MAXLEN  253
175
176 /* DCCP CCIDS */
177 enum {
178         DCCPC_CCID2 = 2,
179         DCCPC_CCID3 = 3,
180 };
181
182 /* DCCP features (RFC 4340 section 6.4) */
183 enum dccp_feature_numbers {
184         DCCPF_RESERVED = 0,
185         DCCPF_CCID = 1,
186         DCCPF_SHORT_SEQNOS = 2,
187         DCCPF_SEQUENCE_WINDOW = 3,
188         DCCPF_ECN_INCAPABLE = 4,
189         DCCPF_ACK_RATIO = 5,
190         DCCPF_SEND_ACK_VECTOR = 6,
191         DCCPF_SEND_NDP_COUNT = 7,
192         DCCPF_MIN_CSUM_COVER = 8,
193         DCCPF_DATA_CHECKSUM = 9,
194         /* 10-127 reserved */
195         DCCPF_MIN_CCID_SPECIFIC = 128,
196         DCCPF_SEND_LEV_RATE = 192,      /* RFC 4342, sec. 8.4 */
197         DCCPF_MAX_CCID_SPECIFIC = 255,
198 };
199
200 /* DCCP socket control message types for cmsg */
201 enum dccp_cmsg_type {
202         DCCP_SCM_PRIORITY = 1,
203         DCCP_SCM_QPOLICY_MAX = 0xFFFF,
204         /* ^-- Up to here reserved exclusively for qpolicy parameters */
205         DCCP_SCM_MAX
206 };
207
208 /* DCCP priorities for outgoing/queued packets */
209 enum dccp_packet_dequeueing_policy {
210         DCCPQ_POLICY_SIMPLE,
211         DCCPQ_POLICY_PRIO,
212         DCCPQ_POLICY_MAX
213 };
214
215 /* DCCP socket options */
216 #define DCCP_SOCKOPT_PACKET_SIZE        1 /* XXX deprecated, without effect */
217 #define DCCP_SOCKOPT_SERVICE            2
218 #define DCCP_SOCKOPT_CHANGE_L           3
219 #define DCCP_SOCKOPT_CHANGE_R           4
220 #define DCCP_SOCKOPT_GET_CUR_MPS        5
221 #define DCCP_SOCKOPT_SERVER_TIMEWAIT    6
222 #define DCCP_SOCKOPT_SEND_CSCOV         10
223 #define DCCP_SOCKOPT_RECV_CSCOV         11
224 #define DCCP_SOCKOPT_AVAILABLE_CCIDS    12
225 #define DCCP_SOCKOPT_CCID               13
226 #define DCCP_SOCKOPT_TX_CCID            14
227 #define DCCP_SOCKOPT_RX_CCID            15
228 #define DCCP_SOCKOPT_QPOLICY_ID         16
229 #define DCCP_SOCKOPT_QPOLICY_TXQLEN     17
230 #define DCCP_SOCKOPT_CCID_RX_INFO       128
231 #define DCCP_SOCKOPT_CCID_TX_INFO       192
232
233 /* maximum number of services provided on the same listening port */
234 #define DCCP_SERVICE_LIST_MAX_LEN      32
235
236 #ifdef __KERNEL__
237
238 #include <linux/in.h>
239 #include <linux/interrupt.h>
240 #include <linux/ktime.h>
241 #include <linux/list.h>
242 #include <linux/uio.h>
243 #include <linux/workqueue.h>
244
245 #include <net/inet_connection_sock.h>
246 #include <net/inet_sock.h>
247 #include <net/inet_timewait_sock.h>
248 #include <net/tcp_states.h>
249
250 enum dccp_state {
251         DCCP_OPEN            = TCP_ESTABLISHED,
252         DCCP_REQUESTING      = TCP_SYN_SENT,
253         DCCP_LISTEN          = TCP_LISTEN,
254         DCCP_RESPOND         = TCP_SYN_RECV,
255         /*
256          * States involved in closing a DCCP connection:
257          * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
258          *
259          * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
260          *  a. Client has performed active-close, has sent a Close to the server
261          *     from state OPEN or PARTOPEN, and is waiting for the final Reset
262          *     (in this case, SOCK_DONE == 1).
263          *  b. Client is asked to perform passive-close, by receiving a CloseReq
264          *     in (PART)OPEN state. It sends a Close and waits for final Reset
265          *     (in this case, SOCK_DONE == 0).
266          *  c. Server performs an active-close as in (a), keeps TIMEWAIT state.
267          *
268          * 3) The following intermediate states are employed to give passively
269          *    closing nodes a chance to process their unread data:
270          *    - PASSIVE_CLOSE    (from OPEN => CLOSED) and
271          *    - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
272          */
273         DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
274         DCCP_PASSIVE_CLOSE   = TCP_CLOSE_WAIT,  /* any node receiving a Close */
275         DCCP_CLOSING         = TCP_CLOSING,
276         DCCP_TIME_WAIT       = TCP_TIME_WAIT,
277         DCCP_CLOSED          = TCP_CLOSE,
278         DCCP_PARTOPEN        = TCP_MAX_STATES,
279         DCCP_PASSIVE_CLOSEREQ,                  /* clients receiving CloseReq */
280         DCCP_MAX_STATES
281 };
282
283 enum {
284         DCCPF_OPEN            = TCPF_ESTABLISHED,
285         DCCPF_REQUESTING      = TCPF_SYN_SENT,
286         DCCPF_LISTEN          = TCPF_LISTEN,
287         DCCPF_RESPOND         = TCPF_SYN_RECV,
288         DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
289         DCCPF_CLOSING         = TCPF_CLOSING,
290         DCCPF_TIME_WAIT       = TCPF_TIME_WAIT,
291         DCCPF_CLOSED          = TCPF_CLOSE,
292         DCCPF_PARTOPEN        = (1 << DCCP_PARTOPEN),
293 };
294
295 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
296 {
297         return (struct dccp_hdr *)skb_transport_header(skb);
298 }
299
300 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
301 {
302         skb_push(skb, headlen);
303         skb_reset_transport_header(skb);
304         return memset(skb_transport_header(skb), 0, headlen);
305 }
306
307 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
308 {
309         return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
310 }
311
312 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
313 {
314         return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
315 }
316
317 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
318 {
319         const struct dccp_hdr *dh = dccp_hdr(skb);
320         return __dccp_basic_hdr_len(dh);
321 }
322
323 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
324 {
325         __u64 seq_nr =  ntohs(dh->dccph_seq);
326
327         if (dh->dccph_x != 0)
328                 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
329         else
330                 seq_nr += (u32)dh->dccph_seq2 << 16;
331
332         return seq_nr;
333 }
334
335 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
336 {
337         return (struct dccp_hdr_request *)(skb_transport_header(skb) +
338                                            dccp_basic_hdr_len(skb));
339 }
340
341 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
342 {
343         return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
344                                             dccp_basic_hdr_len(skb));
345 }
346
347 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
348 {
349         const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
350         return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
351 }
352
353 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
354 {
355         return (struct dccp_hdr_response *)(skb_transport_header(skb) +
356                                             dccp_basic_hdr_len(skb));
357 }
358
359 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
360 {
361         return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
362                                          dccp_basic_hdr_len(skb));
363 }
364
365 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
366 {
367         return __dccp_basic_hdr_len(dh) +
368                dccp_packet_hdr_len(dh->dccph_type);
369 }
370
371 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
372 {
373         return __dccp_hdr_len(dccp_hdr(skb));
374 }
375
376 /**
377  * struct dccp_request_sock  -  represent DCCP-specific connection request
378  * @dreq_inet_rsk: structure inherited from
379  * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
380  * @dreq_isr: initial sequence number received on the Request
381  * @dreq_service: service code present on the Request (there is just one)
382  * @dreq_featneg: feature negotiation options for this connection
383  * The following two fields are analogous to the ones in dccp_sock:
384  * @dreq_timestamp_echo: last received timestamp to echo (13.1)
385  * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
386  */
387 struct dccp_request_sock {
388         struct inet_request_sock dreq_inet_rsk;
389         __u64                    dreq_iss;
390         __u64                    dreq_isr;
391         __be32                   dreq_service;
392         struct list_head         dreq_featneg;
393         __u32                    dreq_timestamp_echo;
394         __u32                    dreq_timestamp_time;
395 };
396
397 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
398 {
399         return (struct dccp_request_sock *)req;
400 }
401
402 extern struct inet_timewait_death_row dccp_death_row;
403
404 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
405                               struct sk_buff *skb);
406
407 struct dccp_options_received {
408         u64     dccpor_ndp:48;
409         u32     dccpor_timestamp;
410         u32     dccpor_timestamp_echo;
411         u32     dccpor_elapsed_time;
412 };
413
414 struct ccid;
415
416 enum dccp_role {
417         DCCP_ROLE_UNDEFINED,
418         DCCP_ROLE_LISTEN,
419         DCCP_ROLE_CLIENT,
420         DCCP_ROLE_SERVER,
421 };
422
423 struct dccp_service_list {
424         __u32   dccpsl_nr;
425         __be32  dccpsl_list[0];
426 };
427
428 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
429 #define DCCP_SERVICE_CODE_IS_ABSENT             0
430
431 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
432                                         const __be32 service)
433 {
434         if (likely(sl != NULL)) {
435                 u32 i = sl->dccpsl_nr;
436                 while (i--)
437                         if (sl->dccpsl_list[i] == service)
438                                 return 1;
439         }
440         return 0;
441 }
442
443 struct dccp_ackvec;
444
445 /**
446  * struct dccp_sock - DCCP socket state
447  *
448  * @dccps_swl - sequence number window low
449  * @dccps_swh - sequence number window high
450  * @dccps_awl - acknowledgement number window low
451  * @dccps_awh - acknowledgement number window high
452  * @dccps_iss - initial sequence number sent
453  * @dccps_isr - initial sequence number received
454  * @dccps_osr - first OPEN sequence number received
455  * @dccps_gss - greatest sequence number sent
456  * @dccps_gsr - greatest valid sequence number received
457  * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
458  * @dccps_service - first (passive sock) or unique (active sock) service code
459  * @dccps_service_list - second .. last service code on passive socket
460  * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
461  * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
462  * @dccps_l_ack_ratio - feature-local Ack Ratio
463  * @dccps_r_ack_ratio - feature-remote Ack Ratio
464  * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
465  * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
466  * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
467  * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
468  * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
469  * @dccps_ndp_count - number of Non Data Packets since last data packet
470  * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
471  * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
472  * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
473  * @dccps_hc_rx_ackvec - rx half connection ack vector
474  * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
475  * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
476  * @dccps_options_received - parsed set of retrieved options
477  * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
478  * @dccps_tx_qlen - maximum length of the TX queue
479  * @dccps_role - role of this sock, one of %dccp_role
480  * @dccps_hc_rx_insert_options - receiver wants to add options when acking
481  * @dccps_hc_tx_insert_options - sender wants to add options when sending
482  * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
483  * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
484  * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
485  * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
486  * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
487  */
488 struct dccp_sock {
489         /* inet_connection_sock has to be the first member of dccp_sock */
490         struct inet_connection_sock     dccps_inet_connection;
491 #define dccps_syn_rtt                   dccps_inet_connection.icsk_ack.lrcvtime
492         __u64                           dccps_swl;
493         __u64                           dccps_swh;
494         __u64                           dccps_awl;
495         __u64                           dccps_awh;
496         __u64                           dccps_iss;
497         __u64                           dccps_isr;
498         __u64                           dccps_osr;
499         __u64                           dccps_gss;
500         __u64                           dccps_gsr;
501         __u64                           dccps_gar;
502         __be32                          dccps_service;
503         __u32                           dccps_mss_cache;
504         struct dccp_service_list        *dccps_service_list;
505         __u32                           dccps_timestamp_echo;
506         __u32                           dccps_timestamp_time;
507         __u16                           dccps_l_ack_ratio;
508         __u16                           dccps_r_ack_ratio;
509         __u64                           dccps_l_seq_win:48;
510         __u64                           dccps_r_seq_win:48;
511         __u8                            dccps_pcslen:4;
512         __u8                            dccps_pcrlen:4;
513         __u8                            dccps_send_ndp_count:1;
514         __u64                           dccps_ndp_count:48;
515         unsigned long                   dccps_rate_last;
516         struct list_head                dccps_featneg;
517         struct dccp_ackvec              *dccps_hc_rx_ackvec;
518         struct ccid                     *dccps_hc_rx_ccid;
519         struct ccid                     *dccps_hc_tx_ccid;
520         struct dccp_options_received    dccps_options_received;
521         __u8                            dccps_qpolicy;
522         __u32                           dccps_tx_qlen;
523         enum dccp_role                  dccps_role:2;
524         __u8                            dccps_hc_rx_insert_options:1;
525         __u8                            dccps_hc_tx_insert_options:1;
526         __u8                            dccps_server_timewait:1;
527         __u8                            dccps_sync_scheduled:1;
528         struct tasklet_struct           dccps_xmitlet;
529         struct timer_list               dccps_xmit_timer;
530 };
531
532 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
533 {
534         return (struct dccp_sock *)sk;
535 }
536
537 static inline const char *dccp_role(const struct sock *sk)
538 {
539         switch (dccp_sk(sk)->dccps_role) {
540         case DCCP_ROLE_UNDEFINED: return "undefined";
541         case DCCP_ROLE_LISTEN:    return "listen";
542         case DCCP_ROLE_SERVER:    return "server";
543         case DCCP_ROLE_CLIENT:    return "client";
544         }
545         return NULL;
546 }
547
548 #endif /* __KERNEL__ */
549
550 #endif /* _LINUX_DCCP_H */