Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) #ifndef _DCCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #define _DCCP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  net/dccp/dccp.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  An implementation of the DCCP protocol
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/dccp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/ktime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/snmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/tcp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "ackvec.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * 	DCCP - specific warning and debugging macros.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define DCCP_WARN(fmt, ...)						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 					 __FILE__, __LINE__, __func__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define DCCP_BUG(a...)       do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #define DCCP_BUG_ON(cond)    do { if (unlikely((cond) != 0))		   \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 				     DCCP_BUG("\"%s\" holds (exception!)", \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 					      __stringify(cond));          \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 			     } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define DCCP_PRINTK(enable, fmt, args...)	do { if (enable)	     \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 							printk(fmt, ##args); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 						} while(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define DCCP_PR_DEBUG(enable, fmt, a...)	DCCP_PRINTK(enable, KERN_DEBUG \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 						  "%s: " fmt, __func__, ##a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #ifdef CONFIG_IP_DCCP_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) extern bool dccp_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define dccp_pr_debug(format, a...)	  DCCP_PR_DEBUG(dccp_debug, format, ##a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #define dccp_debug(fmt, a...)		  dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define dccp_pr_debug(format, a...)	  do {} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) #define dccp_pr_debug_cat(format, a...)	  do {} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define dccp_debug(format, a...)	  do {} while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) extern struct inet_hashinfo dccp_hashinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) extern struct percpu_counter dccp_orphan_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) void dccp_time_wait(struct sock *sk, int state, int timeo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56)  *  Set safe upper bounds for header and option length. Since Data Offset is 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  *  bits (RFC 4340, sec. 5.1), the total header length can never be more than
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #define DCCP_MAX_PACKET_HDR 28
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #define DCCP_FEATNEG_OVERHEAD	 (32 * sizeof(uint32_t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 				     * state, about 60 seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) /* RFC 1122, 4.2.3.1 initial RTO value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * The maximum back-off value for retransmissions. This is needed for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  *  - retransmitting client-Requests (sec. 8.1.1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  *  - retransmitting Close/CloseReq when closing (sec. 8.3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81)  *  - feature-negotiation retransmission (sec. 6.6.3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82)  *  - Acks in client-PARTOPEN state (sec. 8.1.5).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #define DCCP_RTO_MAX ((unsigned int)(64 * HZ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) #define DCCP_SANE_RTT_MIN	100
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) #define DCCP_FALLBACK_RTT	(USEC_PER_SEC / 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #define DCCP_SANE_RTT_MAX	(3 * USEC_PER_SEC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) /* sysctl variables for DCCP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) extern int  sysctl_dccp_request_retries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) extern int  sysctl_dccp_retries1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) extern int  sysctl_dccp_retries2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) extern int  sysctl_dccp_tx_qlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) extern int  sysctl_dccp_sync_ratelimit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  *	48-bit sequence number arithmetic (signed and unsigned)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define INT48_MIN	  0x800000000000LL		/* 2^47	    */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define UINT48_MAX	  0xFFFFFFFFFFFFLL		/* 2^48 - 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define COMPLEMENT48(x)	 (0x1000000000000LL - (x))	/* 2^48 - x */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #define TO_SIGNED48(x)	 (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define TO_UNSIGNED48(x) (((x) >= 0)?	     (x) :  COMPLEMENT48(-(x)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #define ADD48(a, b)	 (((a) + (b)) & UINT48_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #define SUB48(a, b)	 ADD48((a), COMPLEMENT48(b))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static inline void dccp_inc_seqno(u64 *seqno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	*seqno = ADD48(*seqno, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	u64 delta = SUB48(seqno2, seqno1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return TO_SIGNED48(delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* is seq1 < seq2 ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static inline int before48(const u64 seq1, const u64 seq2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /* is seq1 > seq2 ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) #define after48(seq1, seq2)	before48(seq2, seq1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /* is seq2 <= seq1 <= seq3 ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static inline u64 max48(const u64 seq1, const u64 seq2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	return after48(seq1, seq2) ? seq1 : seq2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)  * dccp_loss_count - Approximate the number of lost data packets in a burst loss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)  * @s1:  last known sequence number before the loss ('hole')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)  * @s2:  first sequence number seen after the 'hole'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)  * @ndp: NDP count on packet with sequence number @s2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	s64 delta = dccp_delta_seqno(s1, s2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	WARN_ON(delta < 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	delta -= ndp + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	return delta > 0 ? delta : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)  * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	return dccp_loss_count(s1, s2, ndp) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	DCCP_MIB_NUM = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	DCCP_MIB_ACTIVEOPENS,			/* ActiveOpens */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	DCCP_MIB_ESTABRESETS,			/* EstabResets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	DCCP_MIB_CURRESTAB,			/* CurrEstab */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	DCCP_MIB_OUTSEGS,			/* OutSegs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	DCCP_MIB_OUTRSTS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	DCCP_MIB_ABORTONTIMEOUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	DCCP_MIB_TIMEOUTS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	DCCP_MIB_ABORTFAILED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	DCCP_MIB_PASSIVEOPENS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	DCCP_MIB_ATTEMPTFAILS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	DCCP_MIB_OUTDATAGRAMS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	DCCP_MIB_INERRS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	DCCP_MIB_OPTMANDATORYERROR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	DCCP_MIB_INVALIDOPT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	__DCCP_MIB_MAX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #define DCCP_MIB_MAX	__DCCP_MIB_MAX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) struct dccp_mib {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	unsigned long	mibs[DCCP_MIB_MAX];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #define DCCP_INC_STATS(field)	SNMP_INC_STATS(dccp_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define __DCCP_INC_STATS(field)	__SNMP_INC_STATS(dccp_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) #define DCCP_DEC_STATS(field)	SNMP_DEC_STATS(dccp_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  * 	Checksumming routines
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	const struct dccp_hdr* dh = dccp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (dh->dccph_cscov == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static inline void dccp_csum_outgoing(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	unsigned int cov = dccp_csum_coverage(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (cov >= skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		dccp_hdr(skb)->dccph_cscov = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int dccp_retransmit_skb(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) void dccp_send_ack(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			 struct request_sock *rsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) void dccp_send_sync(struct sock *sk, const u64 seq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		    const enum dccp_pkt_type pkt_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * TX Packet Dequeueing Interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) bool dccp_qpolicy_full(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct sk_buff *dccp_qpolicy_top(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  * TX Packet Output and TX Timers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) void dccp_write_xmit(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) void dccp_write_space(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) void dccp_flush_write_queue(struct sock *sk, long *time_budget);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) void dccp_init_xmit_timers(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static inline void dccp_clear_xmit_timers(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	inet_csk_clear_xmit_timers(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) const char *dccp_packet_name(const int type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) void dccp_set_state(struct sock *sk, const int state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) void dccp_done(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		    struct sk_buff const *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct sock *dccp_create_openreq_child(const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 				       const struct request_sock *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 				       const struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 				       struct request_sock *req,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 				       struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 				       struct request_sock *req_unhash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 				       bool *own_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			    struct request_sock *req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) int dccp_child_process(struct sock *parent, struct sock *child,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		       struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			   struct dccp_hdr *dh, unsigned int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			 const struct dccp_hdr *dh, const unsigned int len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) void dccp_destroy_sock(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) void dccp_close(struct sock *sk, long timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 				   struct request_sock *req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) int dccp_connect(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) int dccp_disconnect(struct sock *sk, int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) int dccp_getsockopt(struct sock *sk, int level, int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		    char __user *optval, int __user *optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) int dccp_setsockopt(struct sock *sk, int level, int optname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		    sockptr_t optval, unsigned int optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		 int flags, int *addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) void dccp_shutdown(struct sock *sk, int how);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) int inet_dccp_listen(struct socket *sock, int backlog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) __poll_t dccp_poll(struct file *file, struct socket *sock,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		       poll_table *wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) void dccp_req_err(struct sock *sk, u64 seq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) void dccp_send_close(struct sock *sk, const int active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) int dccp_invalid_packet(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) u32 dccp_sample_rtt(struct sock *sk, long delta);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static inline bool dccp_bad_service_code(const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 					const __be32 service)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	const struct dccp_sock *dp = dccp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (dp->dccps_service == service)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	return !dccp_list_has_service(dp->dccps_service_list, service);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  * dccp_skb_cb  -  DCCP per-packet control information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)  * @dccpd_type: one of %dccp_pkt_type (or unknown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)  * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)  * @dccpd_reset_code: one of %dccp_reset_codes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)  * @dccpd_opt_len: total length of all options (5.8) in the packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)  * @dccpd_seq: sequence number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)  * @dccpd_ack_seq: acknowledgment number subheader field value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  * This is used for transmission as well as for reception.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct dccp_skb_cb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		struct inet_skb_parm	h4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		struct inet6_skb_parm	h6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	} header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	__u8  dccpd_type:4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	__u8  dccpd_ccval:4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	__u8  dccpd_reset_code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	      dccpd_reset_data[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	__u16 dccpd_opt_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	__u64 dccpd_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	__u64 dccpd_ack_seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) /* RFC 4340, sec. 7.7 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static inline int dccp_non_data_packet(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return type == DCCP_PKT_ACK	 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	       type == DCCP_PKT_CLOSE	 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	       type == DCCP_PKT_CLOSEREQ ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	       type == DCCP_PKT_RESET	 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	       type == DCCP_PKT_SYNC	 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	       type == DCCP_PKT_SYNCACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /* RFC 4340, sec. 7.7 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static inline int dccp_data_packet(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	return type == DCCP_PKT_DATA	 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	       type == DCCP_PKT_DATAACK  ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	       type == DCCP_PKT_REQUEST  ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	       type == DCCP_PKT_RESPONSE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static inline int dccp_packet_without_ack(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 							   sizeof(*dh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	dh->dccph_seq2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 				    const u64 gsr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	dhack->dccph_reserved1 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	dhack->dccph_ack_nr_high = htons(gsr >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 	dhack->dccph_ack_nr_low  = htonl(gsr & 0xffffffff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) static inline void dccp_update_gsr(struct sock *sk, u64 seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	struct dccp_sock *dp = dccp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	if (after48(seq, dp->dccps_gsr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		dp->dccps_gsr = seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	/* Sequence validity window depends on remote Sequence Window (7.5.1) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	 * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	 * 7.5.1 we perform this check beyond the initial handshake: W/W' are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	 * always > 32, so for the first W/W' packets in the lifetime of a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	 * connection we always have to adjust SWL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	 * A second reason why we are doing this is that the window depends on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	 * the feature-remote value of Sequence Window: nothing stops the peer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	 * from updating this value while we are busy adjusting SWL for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	 * first W packets (we would have to count from scratch again then).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	 * Therefore it is safer to always make sure that the Sequence Window
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	 * is not artificially extended by a peer who grows SWL downwards by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	 * continually updating the feature-remote Sequence-Window.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	 * If sequence numbers wrap it is bad luck. But that will take a while
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	 * (48 bit), and this measure prevents Sequence-number attacks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	if (before48(dp->dccps_swl, dp->dccps_isr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 		dp->dccps_swl = dp->dccps_isr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 	dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) static inline void dccp_update_gss(struct sock *sk, u64 seq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	struct dccp_sock *dp = dccp_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 	dp->dccps_gss = seq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	/* Ack validity window depends on local Sequence Window value (7.5.1) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	/* Adjust AWL so that it is not below ISS - see comment above for SWL */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	if (before48(dp->dccps_awl, dp->dccps_iss))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		dp->dccps_awl = dp->dccps_iss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	dp->dccps_awh = dp->dccps_gss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) static inline int dccp_ackvec_pending(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 	return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	       !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) static inline int dccp_ack_pending(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) 	return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int dccp_feat_finalise_settings(struct dccp_sock *dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 			  struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) void dccp_feat_list_purge(struct list_head *fn_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) u32 dccp_timestamp(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) void dccp_timestamping_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) int dccp_insert_option(struct sk_buff *skb, unsigned char option,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 		       const void *value, unsigned char len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) #ifdef CONFIG_SYSCTL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) int dccp_sysctl_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) void dccp_sysctl_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static inline int dccp_sysctl_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) static inline void dccp_sysctl_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) #endif /* _DCCP_H */