1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | #ifndef _DCCP_H |
3 | #define _DCCP_H |
4 | /* |
5 | * net/dccp/dccp.h |
6 | * |
7 | * An implementation of the DCCP protocol |
8 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
9 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
10 | */ |
11 | |
12 | #include <linux/dccp.h> |
13 | #include <linux/ktime.h> |
14 | #include <net/snmp.h> |
15 | #include <net/sock.h> |
16 | #include <net/tcp.h> |
17 | #include "ackvec.h" |
18 | |
19 | /* |
20 | * DCCP - specific warning and debugging macros. |
21 | */ |
22 | #define DCCP_WARN(fmt, ...) \ |
23 | net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__) |
24 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ |
25 | __FILE__, __LINE__, __func__) |
26 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) |
27 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ |
28 | DCCP_BUG("\"%s\" holds (exception!)", \ |
29 | __stringify(cond)); \ |
30 | } while (0) |
31 | |
32 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ |
33 | printk(fmt, ##args); \ |
34 | } while(0) |
35 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
36 | "%s: " fmt, __func__, ##a) |
37 | |
38 | #ifdef CONFIG_IP_DCCP_DEBUG |
39 | extern bool dccp_debug; |
40 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) |
41 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) |
42 | #define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) |
43 | #else |
44 | #define dccp_pr_debug(format, a...) do {} while (0) |
45 | #define dccp_pr_debug_cat(format, a...) do {} while (0) |
46 | #define dccp_debug(format, a...) do {} while (0) |
47 | #endif |
48 | |
49 | extern struct inet_hashinfo dccp_hashinfo; |
50 | |
51 | DECLARE_PER_CPU(unsigned int, dccp_orphan_count); |
52 | |
53 | void dccp_time_wait(struct sock *sk, int state, int timeo); |
54 | |
55 | /* |
56 | * Set safe upper bounds for header and option length. Since Data Offset is 8 |
57 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than |
58 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): |
59 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR |
60 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields |
61 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 |
62 | */ |
63 | #define (255 * sizeof(uint32_t)) |
64 | #define DCCP_MAX_PACKET_HDR 28 |
65 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) |
66 | #define (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) |
67 | |
68 | /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */ |
69 | #define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t)) |
70 | |
71 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT |
72 | * state, about 60 seconds */ |
73 | |
74 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
75 | #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ)) |
76 | |
77 | /* |
78 | * The maximum back-off value for retransmissions. This is needed for |
79 | * - retransmitting client-Requests (sec. 8.1.1), |
80 | * - retransmitting Close/CloseReq when closing (sec. 8.3), |
81 | * - feature-negotiation retransmission (sec. 6.6.3), |
82 | * - Acks in client-PARTOPEN state (sec. 8.1.5). |
83 | */ |
84 | #define DCCP_RTO_MAX ((unsigned int)(64 * HZ)) |
85 | |
86 | /* |
87 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 |
88 | */ |
89 | #define DCCP_SANE_RTT_MIN 100 |
90 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) |
91 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) |
92 | |
93 | /* sysctl variables for DCCP */ |
94 | extern int sysctl_dccp_request_retries; |
95 | extern int sysctl_dccp_retries1; |
96 | extern int sysctl_dccp_retries2; |
97 | extern int sysctl_dccp_tx_qlen; |
98 | extern int sysctl_dccp_sync_ratelimit; |
99 | |
100 | /* |
101 | * 48-bit sequence number arithmetic (signed and unsigned) |
102 | */ |
103 | #define INT48_MIN 0x800000000000LL /* 2^47 */ |
104 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ |
105 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ |
106 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) |
107 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) |
108 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) |
109 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) |
110 | |
111 | static inline void dccp_inc_seqno(u64 *seqno) |
112 | { |
113 | *seqno = ADD48(*seqno, 1); |
114 | } |
115 | |
116 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
117 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) |
118 | { |
119 | u64 delta = SUB48(seqno2, seqno1); |
120 | |
121 | return TO_SIGNED48(delta); |
122 | } |
123 | |
124 | /* is seq1 < seq2 ? */ |
125 | static inline int before48(const u64 seq1, const u64 seq2) |
126 | { |
127 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
128 | } |
129 | |
130 | /* is seq1 > seq2 ? */ |
131 | #define after48(seq1, seq2) before48(seq2, seq1) |
132 | |
133 | /* is seq2 <= seq1 <= seq3 ? */ |
134 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
135 | { |
136 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); |
137 | } |
138 | |
139 | /** |
140 | * dccp_loss_count - Approximate the number of lost data packets in a burst loss |
141 | * @s1: last known sequence number before the loss ('hole') |
142 | * @s2: first sequence number seen after the 'hole' |
143 | * @ndp: NDP count on packet with sequence number @s2 |
144 | */ |
145 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
146 | { |
147 | s64 delta = dccp_delta_seqno(seqno1: s1, seqno2: s2); |
148 | |
149 | WARN_ON(delta < 0); |
150 | delta -= ndp + 1; |
151 | |
152 | return delta > 0 ? delta : 0; |
153 | } |
154 | |
155 | /** |
156 | * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 |
157 | */ |
158 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) |
159 | { |
160 | return dccp_loss_count(s1, s2, ndp) == 0; |
161 | } |
162 | |
163 | enum { |
164 | DCCP_MIB_NUM = 0, |
165 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ |
166 | DCCP_MIB_ESTABRESETS, /* EstabResets */ |
167 | DCCP_MIB_CURRESTAB, /* CurrEstab */ |
168 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
169 | DCCP_MIB_OUTRSTS, |
170 | DCCP_MIB_ABORTONTIMEOUT, |
171 | DCCP_MIB_TIMEOUTS, |
172 | DCCP_MIB_ABORTFAILED, |
173 | DCCP_MIB_PASSIVEOPENS, |
174 | DCCP_MIB_ATTEMPTFAILS, |
175 | DCCP_MIB_OUTDATAGRAMS, |
176 | DCCP_MIB_INERRS, |
177 | DCCP_MIB_OPTMANDATORYERROR, |
178 | DCCP_MIB_INVALIDOPT, |
179 | __DCCP_MIB_MAX |
180 | }; |
181 | |
182 | #define DCCP_MIB_MAX __DCCP_MIB_MAX |
183 | struct dccp_mib { |
184 | unsigned long mibs[DCCP_MIB_MAX]; |
185 | }; |
186 | |
187 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); |
188 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
189 | #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field) |
190 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
191 | |
192 | /* |
193 | * Checksumming routines |
194 | */ |
195 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
196 | { |
197 | const struct dccp_hdr* dh = dccp_hdr(skb); |
198 | |
199 | if (dh->dccph_cscov == 0) |
200 | return skb->len; |
201 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); |
202 | } |
203 | |
204 | static inline void dccp_csum_outgoing(struct sk_buff *skb) |
205 | { |
206 | unsigned int cov = dccp_csum_coverage(skb); |
207 | |
208 | if (cov >= skb->len) |
209 | dccp_hdr(skb)->dccph_cscov = 0; |
210 | |
211 | skb->csum = skb_checksum(skb, offset: 0, len: (cov > skb->len)? skb->len : cov, csum: 0); |
212 | } |
213 | |
214 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
215 | |
216 | int dccp_retransmit_skb(struct sock *sk); |
217 | |
218 | void dccp_send_ack(struct sock *sk); |
219 | void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
220 | struct request_sock *rsk); |
221 | |
222 | void dccp_send_sync(struct sock *sk, const u64 seq, |
223 | const enum dccp_pkt_type pkt_type); |
224 | |
225 | /* |
226 | * TX Packet Dequeueing Interface |
227 | */ |
228 | void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); |
229 | bool dccp_qpolicy_full(struct sock *sk); |
230 | void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); |
231 | struct sk_buff *dccp_qpolicy_top(struct sock *sk); |
232 | struct sk_buff *dccp_qpolicy_pop(struct sock *sk); |
233 | bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); |
234 | |
235 | /* |
236 | * TX Packet Output and TX Timers |
237 | */ |
238 | void dccp_write_xmit(struct sock *sk); |
239 | void dccp_write_space(struct sock *sk); |
240 | void dccp_flush_write_queue(struct sock *sk, long *time_budget); |
241 | |
242 | void dccp_init_xmit_timers(struct sock *sk); |
243 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
244 | { |
245 | inet_csk_clear_xmit_timers(sk); |
246 | } |
247 | |
248 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
249 | |
250 | const char *dccp_packet_name(const int type); |
251 | |
252 | void dccp_set_state(struct sock *sk, const int state); |
253 | void dccp_done(struct sock *sk); |
254 | |
255 | int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
256 | struct sk_buff const *skb); |
257 | |
258 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
259 | |
260 | struct sock *dccp_create_openreq_child(const struct sock *sk, |
261 | const struct request_sock *req, |
262 | const struct sk_buff *skb); |
263 | |
264 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
265 | |
266 | struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb, |
267 | struct request_sock *req, |
268 | struct dst_entry *dst, |
269 | struct request_sock *req_unhash, |
270 | bool *own_req); |
271 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
272 | struct request_sock *req); |
273 | |
274 | int dccp_child_process(struct sock *parent, struct sock *child, |
275 | struct sk_buff *skb); |
276 | int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, |
277 | struct dccp_hdr *dh, unsigned int len); |
278 | int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, |
279 | const struct dccp_hdr *dh, const unsigned int len); |
280 | |
281 | void dccp_destruct_common(struct sock *sk); |
282 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
283 | void dccp_destroy_sock(struct sock *sk); |
284 | |
285 | void dccp_close(struct sock *sk, long timeout); |
286 | struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst, |
287 | struct request_sock *req); |
288 | |
289 | int dccp_connect(struct sock *sk); |
290 | int dccp_disconnect(struct sock *sk, int flags); |
291 | int dccp_getsockopt(struct sock *sk, int level, int optname, |
292 | char __user *optval, int __user *optlen); |
293 | int dccp_setsockopt(struct sock *sk, int level, int optname, |
294 | sockptr_t optval, unsigned int optlen); |
295 | int dccp_ioctl(struct sock *sk, int cmd, int *karg); |
296 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); |
297 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags, |
298 | int *addr_len); |
299 | void dccp_shutdown(struct sock *sk, int how); |
300 | int inet_dccp_listen(struct socket *sock, int backlog); |
301 | __poll_t dccp_poll(struct file *file, struct socket *sock, |
302 | poll_table *wait); |
303 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
304 | void dccp_req_err(struct sock *sk, u64 seq); |
305 | |
306 | struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb); |
307 | int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
308 | void dccp_send_close(struct sock *sk, const int active); |
309 | int dccp_invalid_packet(struct sk_buff *skb); |
310 | u32 dccp_sample_rtt(struct sock *sk, long delta); |
311 | |
312 | static inline bool dccp_bad_service_code(const struct sock *sk, |
313 | const __be32 service) |
314 | { |
315 | const struct dccp_sock *dp = dccp_sk(sk); |
316 | |
317 | if (dp->dccps_service == service) |
318 | return false; |
319 | return !dccp_list_has_service(sl: dp->dccps_service_list, service); |
320 | } |
321 | |
322 | /** |
323 | * dccp_skb_cb - DCCP per-packet control information |
324 | * @dccpd_type: one of %dccp_pkt_type (or unknown) |
325 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 |
326 | * @dccpd_reset_code: one of %dccp_reset_codes |
327 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) |
328 | * @dccpd_opt_len: total length of all options (5.8) in the packet |
329 | * @dccpd_seq: sequence number |
330 | * @dccpd_ack_seq: acknowledgment number subheader field value |
331 | * |
332 | * This is used for transmission as well as for reception. |
333 | */ |
334 | struct dccp_skb_cb { |
335 | union { |
336 | struct inet_skb_parm h4; |
337 | #if IS_ENABLED(CONFIG_IPV6) |
338 | struct inet6_skb_parm h6; |
339 | #endif |
340 | } ; |
341 | __u8 dccpd_type:4; |
342 | __u8 dccpd_ccval:4; |
343 | __u8 dccpd_reset_code, |
344 | dccpd_reset_data[3]; |
345 | __u16 dccpd_opt_len; |
346 | __u64 dccpd_seq; |
347 | __u64 dccpd_ack_seq; |
348 | }; |
349 | |
350 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) |
351 | |
352 | /* RFC 4340, sec. 7.7 */ |
353 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
354 | { |
355 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
356 | |
357 | return type == DCCP_PKT_ACK || |
358 | type == DCCP_PKT_CLOSE || |
359 | type == DCCP_PKT_CLOSEREQ || |
360 | type == DCCP_PKT_RESET || |
361 | type == DCCP_PKT_SYNC || |
362 | type == DCCP_PKT_SYNCACK; |
363 | } |
364 | |
365 | /* RFC 4340, sec. 7.7 */ |
366 | static inline int dccp_data_packet(const struct sk_buff *skb) |
367 | { |
368 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
369 | |
370 | return type == DCCP_PKT_DATA || |
371 | type == DCCP_PKT_DATAACK || |
372 | type == DCCP_PKT_REQUEST || |
373 | type == DCCP_PKT_RESPONSE; |
374 | } |
375 | |
376 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
377 | { |
378 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; |
379 | |
380 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; |
381 | } |
382 | |
383 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
384 | |
385 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) |
386 | { |
387 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
388 | sizeof(*dh)); |
389 | dh->dccph_seq2 = 0; |
390 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); |
391 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
392 | } |
393 | |
394 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
395 | const u64 gsr) |
396 | { |
397 | dhack->dccph_reserved1 = 0; |
398 | dhack->dccph_ack_nr_high = htons(gsr >> 32); |
399 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
400 | } |
401 | |
402 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) |
403 | { |
404 | struct dccp_sock *dp = dccp_sk(sk); |
405 | |
406 | if (after48(seq, dp->dccps_gsr)) |
407 | dp->dccps_gsr = seq; |
408 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
409 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); |
410 | /* |
411 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, |
412 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are |
413 | * always > 32, so for the first W/W' packets in the lifetime of a |
414 | * connection we always have to adjust SWL. |
415 | * A second reason why we are doing this is that the window depends on |
416 | * the feature-remote value of Sequence Window: nothing stops the peer |
417 | * from updating this value while we are busy adjusting SWL for the |
418 | * first W packets (we would have to count from scratch again then). |
419 | * Therefore it is safer to always make sure that the Sequence Window |
420 | * is not artificially extended by a peer who grows SWL downwards by |
421 | * continually updating the feature-remote Sequence-Window. |
422 | * If sequence numbers wrap it is bad luck. But that will take a while |
423 | * (48 bit), and this measure prevents Sequence-number attacks. |
424 | */ |
425 | if (before48(seq1: dp->dccps_swl, seq2: dp->dccps_isr)) |
426 | dp->dccps_swl = dp->dccps_isr; |
427 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
428 | } |
429 | |
430 | static inline void dccp_update_gss(struct sock *sk, u64 seq) |
431 | { |
432 | struct dccp_sock *dp = dccp_sk(sk); |
433 | |
434 | dp->dccps_gss = seq; |
435 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ |
436 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); |
437 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ |
438 | if (before48(seq1: dp->dccps_awl, seq2: dp->dccps_iss)) |
439 | dp->dccps_awl = dp->dccps_iss; |
440 | dp->dccps_awh = dp->dccps_gss; |
441 | } |
442 | |
443 | static inline int dccp_ackvec_pending(const struct sock *sk) |
444 | { |
445 | return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && |
446 | !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); |
447 | } |
448 | |
449 | static inline int dccp_ack_pending(const struct sock *sk) |
450 | { |
451 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
452 | } |
453 | |
454 | int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); |
455 | int dccp_feat_finalise_settings(struct dccp_sock *dp); |
456 | int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
457 | int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, |
458 | struct sk_buff *skb); |
459 | int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
460 | void dccp_feat_list_purge(struct list_head *fn_list); |
461 | |
462 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
463 | int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *); |
464 | u32 dccp_timestamp(void); |
465 | void dccp_timestamping_init(void); |
466 | int dccp_insert_option(struct sk_buff *skb, unsigned char option, |
467 | const void *value, unsigned char len); |
468 | |
469 | #ifdef CONFIG_SYSCTL |
470 | int dccp_sysctl_init(void); |
471 | void dccp_sysctl_exit(void); |
472 | #else |
473 | static inline int dccp_sysctl_init(void) |
474 | { |
475 | return 0; |
476 | } |
477 | |
478 | static inline void dccp_sysctl_exit(void) |
479 | { |
480 | } |
481 | #endif |
482 | |
483 | #endif /* _DCCP_H */ |
484 | |