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Linux/net/dccp/dccp.h

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  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...)
 45 #define dccp_pr_debug_cat(format, a...)
 46 #define dccp_debug(format, a...)
 47 #endif
 48 
 49 extern struct inet_hashinfo dccp_hashinfo;
 50 
 51 extern struct percpu_counter 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 MAX_DCCP_SPECIFIC_HEADER (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_HEADER (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_set_seqno(u64 *seqno, u64 value)
112 {
113         *seqno = value & UINT48_MAX;
114 }
115 
116 static inline void dccp_inc_seqno(u64 *seqno)
117 {
118         *seqno = ADD48(*seqno, 1);
119 }
120 
121 /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
122 static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
123 {
124         u64 delta = SUB48(seqno2, seqno1);
125 
126         return TO_SIGNED48(delta);
127 }
128 
129 /* is seq1 < seq2 ? */
130 static inline int before48(const u64 seq1, const u64 seq2)
131 {
132         return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
133 }
134 
135 /* is seq1 > seq2 ? */
136 #define after48(seq1, seq2)     before48(seq2, seq1)
137 
138 /* is seq2 <= seq1 <= seq3 ? */
139 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
140 {
141         return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
142 }
143 
144 static inline u64 max48(const u64 seq1, const u64 seq2)
145 {
146         return after48(seq1, seq2) ? seq1 : seq2;
147 }
148 
149 /**
150  * dccp_loss_count - Approximate the number of lost data packets in a burst loss
151  * @s1:  last known sequence number before the loss ('hole')
152  * @s2:  first sequence number seen after the 'hole'
153  * @ndp: NDP count on packet with sequence number @s2
154  */
155 static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
156 {
157         s64 delta = dccp_delta_seqno(s1, s2);
158 
159         WARN_ON(delta < 0);
160         delta -= ndp + 1;
161 
162         return delta > 0 ? delta : 0;
163 }
164 
165 /**
166  * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1
167  */
168 static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
169 {
170         return dccp_loss_count(s1, s2, ndp) == 0;
171 }
172 
173 enum {
174         DCCP_MIB_NUM = 0,
175         DCCP_MIB_ACTIVEOPENS,                   /* ActiveOpens */
176         DCCP_MIB_ESTABRESETS,                   /* EstabResets */
177         DCCP_MIB_CURRESTAB,                     /* CurrEstab */
178         DCCP_MIB_OUTSEGS,                       /* OutSegs */
179         DCCP_MIB_OUTRSTS,
180         DCCP_MIB_ABORTONTIMEOUT,
181         DCCP_MIB_TIMEOUTS,
182         DCCP_MIB_ABORTFAILED,
183         DCCP_MIB_PASSIVEOPENS,
184         DCCP_MIB_ATTEMPTFAILS,
185         DCCP_MIB_OUTDATAGRAMS,
186         DCCP_MIB_INERRS,
187         DCCP_MIB_OPTMANDATORYERROR,
188         DCCP_MIB_INVALIDOPT,
189         __DCCP_MIB_MAX
190 };
191 
192 #define DCCP_MIB_MAX    __DCCP_MIB_MAX
193 struct dccp_mib {
194         unsigned long   mibs[DCCP_MIB_MAX];
195 };
196 
197 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
198 #define DCCP_INC_STATS(field)   SNMP_INC_STATS(dccp_statistics, field)
199 #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field)
200 #define DCCP_DEC_STATS(field)   SNMP_DEC_STATS(dccp_statistics, field)
201 
202 /*
203  *      Checksumming routines
204  */
205 static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
206 {
207         const struct dccp_hdr* dh = dccp_hdr(skb);
208 
209         if (dh->dccph_cscov == 0)
210                 return skb->len;
211         return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
212 }
213 
214 static inline void dccp_csum_outgoing(struct sk_buff *skb)
215 {
216         unsigned int cov = dccp_csum_coverage(skb);
217 
218         if (cov >= skb->len)
219                 dccp_hdr(skb)->dccph_cscov = 0;
220 
221         skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
222 }
223 
224 void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
225 
226 int dccp_retransmit_skb(struct sock *sk);
227 
228 void dccp_send_ack(struct sock *sk);
229 void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
230                          struct request_sock *rsk);
231 
232 void dccp_send_sync(struct sock *sk, const u64 seq,
233                     const enum dccp_pkt_type pkt_type);
234 
235 /*
236  * TX Packet Dequeueing Interface
237  */
238 void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
239 bool dccp_qpolicy_full(struct sock *sk);
240 void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
241 struct sk_buff *dccp_qpolicy_top(struct sock *sk);
242 struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
243 bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
244 
245 /*
246  * TX Packet Output and TX Timers
247  */
248 void dccp_write_xmit(struct sock *sk);
249 void dccp_write_space(struct sock *sk);
250 void dccp_flush_write_queue(struct sock *sk, long *time_budget);
251 
252 void dccp_init_xmit_timers(struct sock *sk);
253 static inline void dccp_clear_xmit_timers(struct sock *sk)
254 {
255         inet_csk_clear_xmit_timers(sk);
256 }
257 
258 unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
259 
260 const char *dccp_packet_name(const int type);
261 
262 void dccp_set_state(struct sock *sk, const int state);
263 void dccp_done(struct sock *sk);
264 
265 int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
266                     struct sk_buff const *skb);
267 
268 int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
269 
270 struct sock *dccp_create_openreq_child(const struct sock *sk,
271                                        const struct request_sock *req,
272                                        const struct sk_buff *skb);
273 
274 int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
275 
276 struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb,
277                                        struct request_sock *req,
278                                        struct dst_entry *dst,
279                                        struct request_sock *req_unhash,
280                                        bool *own_req);
281 struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
282                             struct request_sock *req);
283 
284 int dccp_child_process(struct sock *parent, struct sock *child,
285                        struct sk_buff *skb);
286 int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
287                            struct dccp_hdr *dh, unsigned int len);
288 int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
289                          const struct dccp_hdr *dh, const unsigned int len);
290 
291 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
292 void dccp_destroy_sock(struct sock *sk);
293 
294 void dccp_close(struct sock *sk, long timeout);
295 struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst,
296                                    struct request_sock *req);
297 
298 int dccp_connect(struct sock *sk);
299 int dccp_disconnect(struct sock *sk, int flags);
300 int dccp_getsockopt(struct sock *sk, int level, int optname,
301                     char __user *optval, int __user *optlen);
302 int dccp_setsockopt(struct sock *sk, int level, int optname,
303                     char __user *optval, unsigned int optlen);
304 #ifdef CONFIG_COMPAT
305 int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
306                            char __user *optval, int __user *optlen);
307 int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
308                            char __user *optval, unsigned int optlen);
309 #endif
310 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
311 int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
312 int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
313                  int flags, int *addr_len);
314 void dccp_shutdown(struct sock *sk, int how);
315 int inet_dccp_listen(struct socket *sock, int backlog);
316 __poll_t dccp_poll(struct file *file, struct socket *sock,
317                        poll_table *wait);
318 int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
319 void dccp_req_err(struct sock *sk, u64 seq);
320 
321 struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb);
322 int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
323 void dccp_send_close(struct sock *sk, const int active);
324 int dccp_invalid_packet(struct sk_buff *skb);
325 u32 dccp_sample_rtt(struct sock *sk, long delta);
326 
327 static inline bool dccp_bad_service_code(const struct sock *sk,
328                                         const __be32 service)
329 {
330         const struct dccp_sock *dp = dccp_sk(sk);
331 
332         if (dp->dccps_service == service)
333                 return false;
334         return !dccp_list_has_service(dp->dccps_service_list, service);
335 }
336 
337 /**
338  * dccp_skb_cb  -  DCCP per-packet control information
339  * @dccpd_type: one of %dccp_pkt_type (or unknown)
340  * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
341  * @dccpd_reset_code: one of %dccp_reset_codes
342  * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
343  * @dccpd_opt_len: total length of all options (5.8) in the packet
344  * @dccpd_seq: sequence number
345  * @dccpd_ack_seq: acknowledgment number subheader field value
346  *
347  * This is used for transmission as well as for reception.
348  */
349 struct dccp_skb_cb {
350         union {
351                 struct inet_skb_parm    h4;
352 #if IS_ENABLED(CONFIG_IPV6)
353                 struct inet6_skb_parm   h6;
354 #endif
355         } header;
356         __u8  dccpd_type:4;
357         __u8  dccpd_ccval:4;
358         __u8  dccpd_reset_code,
359               dccpd_reset_data[3];
360         __u16 dccpd_opt_len;
361         __u64 dccpd_seq;
362         __u64 dccpd_ack_seq;
363 };
364 
365 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
366 
367 /* RFC 4340, sec. 7.7 */
368 static inline int dccp_non_data_packet(const struct sk_buff *skb)
369 {
370         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
371 
372         return type == DCCP_PKT_ACK      ||
373                type == DCCP_PKT_CLOSE    ||
374                type == DCCP_PKT_CLOSEREQ ||
375                type == DCCP_PKT_RESET    ||
376                type == DCCP_PKT_SYNC     ||
377                type == DCCP_PKT_SYNCACK;
378 }
379 
380 /* RFC 4340, sec. 7.7 */
381 static inline int dccp_data_packet(const struct sk_buff *skb)
382 {
383         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
384 
385         return type == DCCP_PKT_DATA     ||
386                type == DCCP_PKT_DATAACK  ||
387                type == DCCP_PKT_REQUEST  ||
388                type == DCCP_PKT_RESPONSE;
389 }
390 
391 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
392 {
393         const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
394 
395         return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
396 }
397 
398 #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
399 
400 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
401 {
402         struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
403                                                            sizeof(*dh));
404         dh->dccph_seq2 = 0;
405         dh->dccph_seq = htons((gss >> 32) & 0xfffff);
406         dhx->dccph_seq_low = htonl(gss & 0xffffffff);
407 }
408 
409 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
410                                     const u64 gsr)
411 {
412         dhack->dccph_reserved1 = 0;
413         dhack->dccph_ack_nr_high = htons(gsr >> 32);
414         dhack->dccph_ack_nr_low  = htonl(gsr & 0xffffffff);
415 }
416 
417 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
418 {
419         struct dccp_sock *dp = dccp_sk(sk);
420 
421         if (after48(seq, dp->dccps_gsr))
422                 dp->dccps_gsr = seq;
423         /* Sequence validity window depends on remote Sequence Window (7.5.1) */
424         dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
425         /*
426          * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
427          * 7.5.1 we perform this check beyond the initial handshake: W/W' are
428          * always > 32, so for the first W/W' packets in the lifetime of a
429          * connection we always have to adjust SWL.
430          * A second reason why we are doing this is that the window depends on
431          * the feature-remote value of Sequence Window: nothing stops the peer
432          * from updating this value while we are busy adjusting SWL for the
433          * first W packets (we would have to count from scratch again then).
434          * Therefore it is safer to always make sure that the Sequence Window
435          * is not artificially extended by a peer who grows SWL downwards by
436          * continually updating the feature-remote Sequence-Window.
437          * If sequence numbers wrap it is bad luck. But that will take a while
438          * (48 bit), and this measure prevents Sequence-number attacks.
439          */
440         if (before48(dp->dccps_swl, dp->dccps_isr))
441                 dp->dccps_swl = dp->dccps_isr;
442         dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
443 }
444 
445 static inline void dccp_update_gss(struct sock *sk, u64 seq)
446 {
447         struct dccp_sock *dp = dccp_sk(sk);
448 
449         dp->dccps_gss = seq;
450         /* Ack validity window depends on local Sequence Window value (7.5.1) */
451         dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
452         /* Adjust AWL so that it is not below ISS - see comment above for SWL */
453         if (before48(dp->dccps_awl, dp->dccps_iss))
454                 dp->dccps_awl = dp->dccps_iss;
455         dp->dccps_awh = dp->dccps_gss;
456 }
457 
458 static inline int dccp_ackvec_pending(const struct sock *sk)
459 {
460         return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
461                !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
462 }
463 
464 static inline int dccp_ack_pending(const struct sock *sk)
465 {
466         return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
467 }
468 
469 int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
470 int dccp_feat_finalise_settings(struct dccp_sock *dp);
471 int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
472 int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
473                           struct sk_buff *skb);
474 int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
475 void dccp_feat_list_purge(struct list_head *fn_list);
476 
477 int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
478 int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *);
479 u32 dccp_timestamp(void);
480 void dccp_timestamping_init(void);
481 int dccp_insert_option(struct sk_buff *skb, unsigned char option,
482                        const void *value, unsigned char len);
483 
484 #ifdef CONFIG_SYSCTL
485 int dccp_sysctl_init(void);
486 void dccp_sysctl_exit(void);
487 #else
488 static inline int dccp_sysctl_init(void)
489 {
490         return 0;
491 }
492 
493 static inline void dccp_sysctl_exit(void)
494 {
495 }
496 #endif
497 
498 #endif /* _DCCP_H */
499 

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