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Release 4.14 net/dccp/dccp.h

Directory: net/dccp
#ifndef _DCCP_H

#define _DCCP_H
/*
 *  net/dccp/dccp.h
 *
 *  An implementation of the DCCP protocol
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
 *
 *      This program is free software; you can redistribute it and/or modify it
 *      under the terms of the GNU General Public License version 2 as
 *      published by the Free Software Foundation.
 */

#include <linux/dccp.h>
#include <linux/ktime.h>
#include <net/snmp.h>
#include <net/sock.h>
#include <net/tcp.h>
#include "ackvec.h"

/*
 *      DCCP - specific warning and debugging macros.
 */

#define DCCP_WARN(fmt, ...)						\
	net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__)

#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
                                         __FILE__, __LINE__, __func__)

#define DCCP_BUG(a...)       do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)

#define DCCP_BUG_ON(cond)    do { if (unlikely((cond) != 0))            \
                                     DCCP_BUG("\"%s\" holds (exception!)", \
                                              __stringify(cond));          \
                             } while (0)


#define DCCP_PRINTK(enable, fmt, args...)	do { if (enable)             \
                                                        printk(fmt, ##args); \
                                                } while(0)

#define DCCP_PR_DEBUG(enable, fmt, a...)	DCCP_PRINTK(enable, KERN_DEBUG \
                                                  "%s: " fmt, __func__, ##a)

#ifdef CONFIG_IP_DCCP_DEBUG
extern bool dccp_debug;

#define dccp_pr_debug(format, a...)	  DCCP_PR_DEBUG(dccp_debug, format, ##a)

#define dccp_pr_debug_cat(format, a...)   DCCP_PRINTK(dccp_debug, format, ##a)

#define dccp_debug(fmt, a...)		  dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
#else

#define dccp_pr_debug(format, a...)

#define dccp_pr_debug_cat(format, a...)

#define dccp_debug(format, a...)
#endif

extern struct inet_hashinfo dccp_hashinfo;

extern struct percpu_counter dccp_orphan_count;

void dccp_time_wait(struct sock *sk, int state, int timeo);

/*
 *  Set safe upper bounds for header and option length. Since Data Offset is 8
 *  bits (RFC 4340, sec. 5.1), the total header length can never be more than
 *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
 *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR
 *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
 *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
 */

#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))

#define DCCP_MAX_PACKET_HDR 28

#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)

#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)

/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */

#define DCCP_FEATNEG_OVERHEAD	 (32 * sizeof(uint32_t))


#define DCCP_TIMEWAIT_LEN (60 * HZ) 
/* how long to wait to destroy TIME-WAIT
                                     * state, about 60 seconds */

/* RFC 1122, 4.2.3.1 initial RTO value */

#define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ))

/*
 * The maximum back-off value for retransmissions. This is needed for
 *  - retransmitting client-Requests (sec. 8.1.1),
 *  - retransmitting Close/CloseReq when closing (sec. 8.3),
 *  - feature-negotiation retransmission (sec. 6.6.3),
 *  - Acks in client-PARTOPEN state (sec. 8.1.5).
 */

#define DCCP_RTO_MAX ((unsigned int)(64 * HZ))

/*
 * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
 */

#define DCCP_SANE_RTT_MIN	100

#define DCCP_FALLBACK_RTT	(USEC_PER_SEC / 5)

#define DCCP_SANE_RTT_MAX	(3 * USEC_PER_SEC)

/* sysctl variables for DCCP */
extern int  sysctl_dccp_request_retries;
extern int  sysctl_dccp_retries1;
extern int  sysctl_dccp_retries2;
extern int  sysctl_dccp_tx_qlen;
extern int  sysctl_dccp_sync_ratelimit;

/*
 *      48-bit sequence number arithmetic (signed and unsigned)
 */

#define INT48_MIN	  0x800000000000LL		
/* 2^47     */

#define UINT48_MAX	  0xFFFFFFFFFFFFLL		
/* 2^48 - 1 */

#define COMPLEMENT48(x)	 (0x1000000000000LL - (x))	
/* 2^48 - x */

#define TO_SIGNED48(x)	 (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))

#define TO_UNSIGNED48(x) (((x) >= 0)?         (x) :  COMPLEMENT48(-(x)))

#define ADD48(a, b)	 (((a) + (b)) & UINT48_MAX)

#define SUB48(a, b)	 ADD48((a), COMPLEMENT48(b))


static inline void dccp_set_seqno(u64 *seqno, u64 value) { *seqno = value & UINT48_MAX; }

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static inline void dccp_inc_seqno(u64 *seqno) { *seqno = ADD48(*seqno, 1); }

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Gerrit Renker22100.00%1100.00%
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/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) { u64 delta = SUB48(seqno2, seqno1); return TO_SIGNED48(delta); }

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Gerrit Renker31100.00%2100.00%
Total31100.00%2100.00%

/* is seq1 < seq2 ? */
static inline int before48(const u64 seq1, const u64 seq2) { return (s64)((seq2 << 16) - (seq1 << 16)) > 0; }

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Arnaldo Carvalho de Melo2880.00%133.33%
Patrick McHardy411.43%133.33%
Gerrit Renker38.57%133.33%
Total35100.00%3100.00%

/* is seq1 > seq2 ? */ #define after48(seq1, seq2) before48(seq2, seq1) /* is seq2 <= seq1 <= seq3 ? */
static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) { return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); }

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static inline u64 max48(const u64 seq1, const u64 seq2) { return after48(seq1, seq2) ? seq1 : seq2; }

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/** * dccp_loss_count - Approximate the number of lost data packets in a burst loss * @s1: last known sequence number before the loss ('hole') * @s2: first sequence number seen after the 'hole' * @ndp: NDP count on packet with sequence number @s2 */
static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) { s64 delta = dccp_delta_seqno(s1, s2); WARN_ON(delta < 0); delta -= ndp + 1; return delta > 0 ? delta : 0; }

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Gerrit Renker3568.63%133.33%
Ivo Calado1427.45%133.33%
Ilpo Järvinen23.92%133.33%
Total51100.00%3100.00%

/** * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 */
static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) { return dccp_loss_count(s1, s2, ndp) == 0; }

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Ivo Calado2993.55%150.00%
Gerrit Renker26.45%150.00%
Total31100.00%2100.00%

enum { DCCP_MIB_NUM = 0, DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ DCCP_MIB_ESTABRESETS, /* EstabResets */ DCCP_MIB_CURRESTAB, /* CurrEstab */ DCCP_MIB_OUTSEGS, /* OutSegs */ DCCP_MIB_OUTRSTS, DCCP_MIB_ABORTONTIMEOUT, DCCP_MIB_TIMEOUTS, DCCP_MIB_ABORTFAILED, DCCP_MIB_PASSIVEOPENS, DCCP_MIB_ATTEMPTFAILS, DCCP_MIB_OUTDATAGRAMS, DCCP_MIB_INERRS, DCCP_MIB_OPTMANDATORYERROR, DCCP_MIB_INVALIDOPT, __DCCP_MIB_MAX }; #define DCCP_MIB_MAX __DCCP_MIB_MAX struct dccp_mib { unsigned long mibs[DCCP_MIB_MAX]; }; DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field) #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) /* * Checksumming routines */
static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) { const struct dccp_hdr* dh = dccp_hdr(skb); if (dh->dccph_cscov == 0) return skb->len; return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); }

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Gerrit Renker5598.21%150.00%
Ian McDonald11.79%150.00%
Total56100.00%2100.00%


static inline void dccp_csum_outgoing(struct sk_buff *skb) { unsigned int cov = dccp_csum_coverage(skb); if (cov >= skb->len) dccp_hdr(skb)->dccph_cscov = 0; skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); }

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Gerrit Renker6498.46%150.00%
Ian McDonald11.54%150.00%
Total65100.00%2100.00%

void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); int dccp_retransmit_skb(struct sock *sk); void dccp_send_ack(struct sock *sk); void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, struct request_sock *rsk); void dccp_send_sync(struct sock *sk, const u64 seq, const enum dccp_pkt_type pkt_type); /* * TX Packet Dequeueing Interface */ void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); bool dccp_qpolicy_full(struct sock *sk); void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); struct sk_buff *dccp_qpolicy_top(struct sock *sk); struct sk_buff *dccp_qpolicy_pop(struct sock *sk); bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); /* * TX Packet Output and TX Timers */ void dccp_write_xmit(struct sock *sk); void dccp_write_space(struct sock *sk); void dccp_flush_write_queue(struct sock *sk, long *time_budget); void dccp_init_xmit_timers(struct sock *sk);
static inline void dccp_clear_xmit_timers(struct sock *sk) { inet_csk_clear_xmit_timers(sk); }

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unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); const char *dccp_packet_name(const int type); void dccp_set_state(struct sock *sk, const int state); void dccp_done(struct sock *sk); int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, struct sk_buff const *skb); int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); struct sock *dccp_create_openreq_child(const struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst, struct request_sock *req_unhash, bool *own_req); struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, struct request_sock *req); int dccp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb); int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, struct dccp_hdr *dh, unsigned int len); int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, const struct dccp_hdr *dh, const unsigned int len); int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); void dccp_destroy_sock(struct sock *sk); void dccp_close(struct sock *sk, long timeout); struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst, struct request_sock *req); int dccp_connect(struct sock *sk); int dccp_disconnect(struct sock *sk, int flags); int dccp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); int dccp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); #ifdef CONFIG_COMPAT int compat_dccp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); int compat_dccp_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen); #endif int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); void dccp_shutdown(struct sock *sk, int how); int inet_dccp_listen(struct socket *sock, int backlog); unsigned int dccp_poll(struct file *file, struct socket *sock, poll_table *wait); int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); void dccp_req_err(struct sock *sk, u64 seq); struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb); int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); void dccp_send_close(struct sock *sk, const int active); int dccp_invalid_packet(struct sk_buff *skb); u32 dccp_sample_rtt(struct sock *sk, long delta);
static inline bool dccp_bad_service_code(const struct sock *sk, const __be32 service) { const struct dccp_sock *dp = dccp_sk(sk); if (dp->dccps_service == service) return false; return !dccp_list_has_service(dp->dccps_service_list, service); }

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Arnaldo Carvalho de Melo4794.00%133.33%
Yaowei Bai24.00%133.33%
Andrea Bittau12.00%133.33%
Total50100.00%3100.00%

/** * dccp_skb_cb - DCCP per-packet control information * @dccpd_type: one of %dccp_pkt_type (or unknown) * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 * @dccpd_reset_code: one of %dccp_reset_codes * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) * @dccpd_opt_len: total length of all options (5.8) in the packet * @dccpd_seq: sequence number * @dccpd_ack_seq: acknowledgment number subheader field value * * This is used for transmission as well as for reception. */ struct dccp_skb_cb { union { struct inet_skb_parm h4; #if IS_ENABLED(CONFIG_IPV6) struct inet6_skb_parm h6; #endif } header; __u8 dccpd_type:4; __u8 dccpd_ccval:4; __u8 dccpd_reset_code, dccpd_reset_data[3]; __u16 dccpd_opt_len; __u64 dccpd_seq; __u64 dccpd_ack_seq; }; #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) /* RFC 4340, sec. 7.7 */
static inline int dccp_non_data_packet(const struct sk_buff *skb) { const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; return type == DCCP_PKT_ACK || type == DCCP_PKT_CLOSE || type == DCCP_PKT_CLOSEREQ || type == DCCP_PKT_RESET || type == DCCP_PKT_SYNC || type == DCCP_PKT_SYNCACK; }

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/* RFC 4340, sec. 7.7 */
static inline int dccp_data_packet(const struct sk_buff *skb) { const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; return type == DCCP_PKT_DATA || type == DCCP_PKT_DATAACK || type == DCCP_PKT_REQUEST || type == DCCP_PKT_RESPONSE; }

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Gerrit Renker41100.00%1100.00%
Total41100.00%1100.00%


static inline int dccp_packet_without_ack(const struct sk_buff *skb) { const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; }

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#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) { struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + sizeof(*dh)); dh->dccph_seq2 = 0; dh->dccph_seq = htons((gss >> 32) & 0xfffff); dhx->dccph_seq_low = htonl(gss & 0xffffffff); }

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Andrea Bittau56.94%150.00%
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static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, const u64 gsr) { dhack->dccph_reserved1 = 0; dhack->dccph_ack_nr_high = htons(gsr >> 32); dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); }

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Andrea Bittau36.82%150.00%
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static inline void dccp_update_gsr(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); if (after48(seq, dp->dccps_gsr)) dp->dccps_gsr = seq; /* Sequence validity window depends on remote Sequence Window (7.5.1) */ dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); /* * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, * 7.5.1 we perform this check beyond the initial handshake: W/W' are * always > 32, so for the first W/W' packets in the lifetime of a * connection we always have to adjust SWL. * A second reason why we are doing this is that the window depends on * the feature-remote value of Sequence Window: nothing stops the peer * from updating this value while we are busy adjusting SWL for the * first W packets (we would have to count from scratch again then). * Therefore it is safer to always make sure that the Sequence Window * is not artificially extended by a peer who grows SWL downwards by * continually updating the feature-remote Sequence-Window. * If sequence numbers wrap it is bad luck. But that will take a while * (48 bit), and this measure prevents Sequence-number attacks. */ if (before48(dp->dccps_swl, dp->dccps_isr)) dp->dccps_swl = dp->dccps_isr; dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); }

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Arnaldo Carvalho de Melo5853.70%240.00%
Gerrit Renker3936.11%240.00%
Samuel Jero1110.19%120.00%
Total108100.00%5100.00%


static inline void dccp_update_gss(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); dp->dccps_gss = seq; /* Ack validity window depends on local Sequence Window value (7.5.1) */ dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); /* Adjust AWL so that it is not below ISS - see comment above for SWL */ if (before48(dp->dccps_awl, dp->dccps_iss)) dp->dccps_awl = dp->dccps_iss; dp->dccps_awh = dp->dccps_gss; }

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Arnaldo Carvalho de Melo4150.00%360.00%
Gerrit Renker4150.00%240.00%
Total82100.00%5100.00%


static inline int dccp_ackvec_pending(const struct sock *sk) { return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); }

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Arnaldo Carvalho de Melo2161.76%133.33%
Gerrit Renker1338.24%266.67%
Total34100.00%3100.00%


static inline int dccp_ack_pending(const struct sock *sk) { return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); }

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Gerrit Renker1770.83%150.00%
Arnaldo Carvalho de Melo729.17%150.00%
Total24100.00%2100.00%

int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); int dccp_feat_finalise_settings(struct dccp_sock *dp); int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, struct sk_buff *skb); int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); void dccp_feat_list_purge(struct list_head *fn_list); int dccp_insert_options(struct sock *sk, struct sk_buff *skb); int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *); u32 dccp_timestamp(void); void dccp_timestamping_init(void); int dccp_insert_option(struct sk_buff *skb, unsigned char option, const void *value, unsigned char len); #ifdef CONFIG_SYSCTL int dccp_sysctl_init(void); void dccp_sysctl_exit(void); #else
static inline int dccp_sysctl_init(void) { return 0; }

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static inline void dccp_sysctl_exit(void) { }

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#endif #endif /* _DCCP_H */

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Arnaldo Carvalho de Melo135857.03%1921.11%
Gerrit Renker74631.33%3741.11%
Tomasz Grobelny733.07%22.22%
Dmitry Mishin532.23%11.11%
Ivo Calado451.89%11.11%
Eric Dumazet341.43%1112.22%
Patrick McHardy241.01%22.22%
Samuel Jero110.46%11.11%
Andrea Bittau90.38%11.11%
Gui Jianfeng60.25%11.11%
Ian McDonald60.25%44.44%
David S. Miller20.08%11.11%
Yaowei Bai20.08%11.11%
Joe Perches20.08%11.11%
Denis V. Lunev20.08%11.11%
Ilpo Järvinen20.08%11.11%
Harvey Harrison20.08%11.11%
Hideaki Yoshifuji / 吉藤英明10.04%11.11%
Brian Haley10.04%11.11%
Rusty Russell10.04%11.11%
Ben Hutchings10.04%11.11%
Total2381100.00%90100.00%
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