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net/dccp/dccp.h
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#ifndef _DCCP_H #define _DCCP_H /* * net/dccp/dccp.h * * An implementation of the DCCP protocol |
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
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* Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> |
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* * 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> |
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#include <linux/ktime.h> |
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#include <net/snmp.h> #include <net/sock.h> #include <net/tcp.h> |
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#include "ackvec.h" |
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/* * DCCP - specific warning and debugging macros. */ #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \ |
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__func__, ##a) |
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#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s() ", ##a, \ |
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__FILE__, __LINE__, __func__) |
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#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)); \ |
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} while (0) |
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#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ printk(fmt, ##args); \ |
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} while(0) |
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#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
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"%s: " fmt, __func__, ##a) |
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#ifdef CONFIG_IP_DCCP_DEBUG |
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extern bool dccp_debug; |
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#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) |
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#define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) |
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#else #define dccp_pr_debug(format, a...) #define dccp_pr_debug_cat(format, a...) |
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#define dccp_debug(format, a...) |
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#endif extern struct inet_hashinfo dccp_hashinfo; |
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extern struct percpu_counter dccp_orphan_count; |
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extern void dccp_time_wait(struct sock *sk, int state, int timeo); |
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/* * 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 */ |
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#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t)) |
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#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) |
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/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */ #define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t)) |
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#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT * state, about 60 seconds */ |
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/* RFC 1122, 4.2.3.1 initial RTO value */ |
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#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
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/* * 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)(64 * HZ)) |
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/* * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 */ |
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#define DCCP_SANE_RTT_MIN 100 |
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#define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) |
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/* sysctl variables for DCCP */ extern int sysctl_dccp_request_retries; extern int sysctl_dccp_retries1; extern int sysctl_dccp_retries2; |
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extern int sysctl_dccp_tx_qlen; |
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extern int sysctl_dccp_sync_ratelimit; |
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/* * 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; } static inline void dccp_inc_seqno(u64 *seqno) { *seqno = ADD48(*seqno, 1); } |
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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) |
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{ |
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u64 delta = SUB48(seqno2, seqno1); return TO_SIGNED48(delta); |
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} |
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/* is seq1 < seq2 ? */ |
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static inline int before48(const u64 seq1, const u64 seq2) |
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{ |
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return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
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} /* is seq1 > seq2 ? */ |
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#define after48(seq1, seq2) before48(seq2, seq1) |
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/* is seq2 <= seq1 <= seq3 ? */ |
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static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
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{ return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); } static inline u64 max48(const u64 seq1, const u64 seq2) { return after48(seq1, seq2) ? seq1 : seq2; } |
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/** |
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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' |
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* @ndp: NDP count on packet with sequence number @s2 |
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*/ |
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static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
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{ s64 delta = dccp_delta_seqno(s1, s2); |
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WARN_ON(delta < 0); |
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delta -= ndp + 1; return delta > 0 ? delta : 0; } /** * 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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} |
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enum { DCCP_MIB_NUM = 0, DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ DCCP_MIB_ESTABRESETS, /* EstabResets */ DCCP_MIB_CURRESTAB, /* CurrEstab */ |
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DCCP_MIB_OUTSEGS, /* OutSegs */ |
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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]; |
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}; |
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DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); |
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#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) |
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#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
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/* * Checksumming routines */ |
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static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
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{ 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); } static inline void dccp_csum_outgoing(struct sk_buff *skb) { |
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unsigned int cov = dccp_csum_coverage(skb); |
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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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extern void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
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extern int dccp_retransmit_skb(struct sock *sk); |
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extern void dccp_send_ack(struct sock *sk); |
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extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, struct request_sock *rsk); |
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extern void dccp_send_sync(struct sock *sk, const u64 seq, const enum dccp_pkt_type pkt_type); |
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/* * TX Packet Dequeueing Interface */ extern void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); extern bool dccp_qpolicy_full(struct sock *sk); extern void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); extern struct sk_buff *dccp_qpolicy_top(struct sock *sk); extern struct sk_buff *dccp_qpolicy_pop(struct sock *sk); |
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extern bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); |
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/* * TX Packet Output and TX Timers */ |
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extern void dccp_write_xmit(struct sock *sk); extern void dccp_write_space(struct sock *sk); extern void dccp_flush_write_queue(struct sock *sk, long *time_budget); |
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extern void dccp_init_xmit_timers(struct sock *sk); static inline void dccp_clear_xmit_timers(struct sock *sk) { inet_csk_clear_xmit_timers(sk); } extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); extern const char *dccp_packet_name(const int type); |
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extern void dccp_set_state(struct sock *sk, const int state); extern void dccp_done(struct sock *sk); |
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extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, struct sk_buff const *skb); |
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extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); extern struct sock *dccp_create_openreq_child(struct sock *sk, const struct request_sock *req, const struct sk_buff *skb); extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
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extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst); extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct request_sock **prev); extern int dccp_child_process(struct sock *parent, struct sock *child, struct sk_buff *skb); extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, struct dccp_hdr *dh, unsigned len); extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, const struct dccp_hdr *dh, const unsigned len); |
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extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
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extern void dccp_destroy_sock(struct sock *sk); |
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extern void dccp_close(struct sock *sk, long timeout); extern struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, struct request_sock *req); extern int dccp_connect(struct sock *sk); extern int dccp_disconnect(struct sock *sk, int flags); extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
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char __user *optval, int __user *optlen); extern int dccp_setsockopt(struct sock *sk, int level, int optname, |
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char __user *optval, unsigned int optlen); |
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#ifdef CONFIG_COMPAT extern int compat_dccp_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); extern int compat_dccp_setsockopt(struct sock *sk, int level, int optname, |
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char __user *optval, unsigned int optlen); |
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#endif |
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extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
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extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t size); |
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extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int nonblock, int flags, int *addr_len); |
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extern void dccp_shutdown(struct sock *sk, int how); |
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extern int inet_dccp_listen(struct socket *sock, int backlog); extern unsigned int dccp_poll(struct file *file, struct socket *sock, poll_table *wait); |
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extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
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extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk, |
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struct sk_buff *skb); |
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extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
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extern void dccp_send_close(struct sock *sk, const int active); |
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extern int dccp_invalid_packet(struct sk_buff *skb); |
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extern u32 dccp_sample_rtt(struct sock *sk, long delta); |
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static inline int dccp_bad_service_code(const struct sock *sk, |
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const __be32 service) |
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{ const struct dccp_sock *dp = dccp_sk(sk); if (dp->dccps_service == service) return 0; return !dccp_list_has_service(dp->dccps_service_list, service); } |
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/** * 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. */ |
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struct dccp_skb_cb { |
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union { struct inet_skb_parm h4; |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct inet6_skb_parm h6; #endif } header; |
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__u8 dccpd_type:4; __u8 dccpd_ccval:4; |
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__u8 dccpd_reset_code, dccpd_reset_data[3]; |
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__u16 dccpd_opt_len; |
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__u64 dccpd_seq; __u64 dccpd_ack_seq; |
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}; #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) |
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/* RFC 4340, sec. 7.7 */ |
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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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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; } |
6b811d43f [DCCP]: 48-bit se... |
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#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
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static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) { |
7690af3ff [DCCP]: Just refl... |
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struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + sizeof(*dh)); |
60fe62e78 [DCCP]: sparse en... |
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dh->dccph_seq2 = 0; dh->dccph_seq = htons((gss >> 32) & 0xfffff); |
7c657876b [DCCP]: Initial i... |
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dhx->dccph_seq_low = htonl(gss & 0xffffffff); } |
7690af3ff [DCCP]: Just refl... |
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static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, const u64 gsr) |
7c657876b [DCCP]: Initial i... |
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{ |
60fe62e78 [DCCP]: sparse en... |
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dhack->dccph_reserved1 = 0; dhack->dccph_ack_nr_high = htons(gsr >> 32); |
7c657876b [DCCP]: Initial i... |
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dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); } static inline void dccp_update_gsr(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); |
7c657876b [DCCP]: Initial i... |
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763dadd47 dccp: fix bug in ... |
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if (after48(seq, dp->dccps_gsr)) dp->dccps_gsr = seq; |
792b48780 dccp: Implement b... |
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/* 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); |
0b53d4604 dccp: fix the adj... |
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/* * 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; |
792b48780 dccp: Implement b... |
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dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
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} static inline void dccp_update_gss(struct sock *sk, u64 seq) { struct dccp_sock *dp = dccp_sk(sk); |
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792b48780 dccp: Implement b... |
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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); |
0b53d4604 dccp: fix the adj... |
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/* 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; |
792b48780 dccp: Implement b... |
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dp->dccps_awh = dp->dccps_gss; |
7c657876b [DCCP]: Initial i... |
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} |
c9eaf1734 [NET] DCCP: Fix w... |
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b3d14bff1 dccp ccid-2: Impl... |
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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); } |
ae31c3399 [DCCP]: Move the ... |
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static inline int dccp_ack_pending(const struct sock *sk) { |
b3d14bff1 dccp ccid-2: Impl... |
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return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
ae31c3399 [DCCP]: Move the ... |
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} |
7c657876b [DCCP]: Initial i... |
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d6916f87c dccp: support for... |
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extern int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); |
9eca0a47d dccp: Resolve dep... |
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extern int dccp_feat_finalise_settings(struct dccp_sock *dp); |
0c1168398 dccp: Mechanism t... |
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extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
0971d17ca dccp: Insert feat... |
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extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, struct sk_buff *skb); |
422d9cdcb dccp: Feature act... |
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extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
61e6473ef dccp: List manage... |
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extern void dccp_feat_list_purge(struct list_head *fn_list); |
2d0817d11 [DCCP] options: M... |
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extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
af3b867e2 [DCCP]: Support i... |
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extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*); |
a7d13fbf8 dccp: remove unus... |
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extern int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed); |
4c70f383e [DCCP]: Provide 1... |
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extern u32 dccp_timestamp(void); extern void dccp_timestamping_init(void); |
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extern int dccp_insert_option(struct sk_buff *skb, unsigned char option, const void *value, unsigned char len); |
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e55d912f5 [DCCP] feat: Intr... |
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#ifdef CONFIG_SYSCTL extern int dccp_sysctl_init(void); extern void dccp_sysctl_exit(void); #else static inline int dccp_sysctl_init(void) { return 0; } static inline void dccp_sysctl_exit(void) { } #endif |
7c657876b [DCCP]: Initial i... |
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#endif /* _DCCP_H */ |