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492 lines
14 KiB
492 lines
14 KiB
#ifndef _DCCP_H
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#define _DCCP_H
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/*
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* net/dccp/dccp.h
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*
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* 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 Ian McDonald <iam4@cs.waikato.ac.nz>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/config.h>
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#include <linux/dccp.h>
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#include <net/snmp.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#ifdef CONFIG_IP_DCCP_DEBUG
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extern int dccp_debug;
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#define dccp_pr_debug(format, a...) \
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do { if (dccp_debug) \
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printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
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} while (0)
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#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
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printk(format, ##a); } while (0)
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#else
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#define dccp_pr_debug(format, a...)
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#define dccp_pr_debug_cat(format, a...)
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#endif
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extern struct inet_hashinfo dccp_hashinfo;
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extern atomic_t dccp_orphan_count;
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extern int dccp_tw_count;
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extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
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extern void dccp_time_wait(struct sock *sk, int state, int timeo);
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/* FIXME: Right size this */
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#define DCCP_MAX_OPT_LEN 128
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#define DCCP_MAX_PACKET_HDR 32
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#define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
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#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
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* state, about 60 seconds */
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/* draft-ietf-dccp-spec-11.txt initial RTO value */
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#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
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/* Maximal interval between probes for local resources. */
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#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
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#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
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extern struct proto dccp_v4_prot;
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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)((seq1 << 16) - (seq2 << 16)) < 0;
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}
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/* is seq1 > seq2 ? */
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static inline int after48(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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}
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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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{
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return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
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}
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static inline u64 max48(const u64 seq1, const u64 seq2)
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{
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return after48(seq1, seq2) ? seq1 : seq2;
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}
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enum {
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DCCP_MIB_NUM = 0,
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DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
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DCCP_MIB_ESTABRESETS, /* EstabResets */
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DCCP_MIB_CURRESTAB, /* CurrEstab */
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DCCP_MIB_OUTSEGS, /* OutSegs */
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DCCP_MIB_OUTRSTS,
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DCCP_MIB_ABORTONTIMEOUT,
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DCCP_MIB_TIMEOUTS,
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DCCP_MIB_ABORTFAILED,
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DCCP_MIB_PASSIVEOPENS,
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DCCP_MIB_ATTEMPTFAILS,
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DCCP_MIB_OUTDATAGRAMS,
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DCCP_MIB_INERRS,
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DCCP_MIB_OPTMANDATORYERROR,
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DCCP_MIB_INVALIDOPT,
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__DCCP_MIB_MAX
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};
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#define DCCP_MIB_MAX __DCCP_MIB_MAX
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struct dccp_mib {
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unsigned long mibs[DCCP_MIB_MAX];
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} __SNMP_MIB_ALIGN__;
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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)
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#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
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#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
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#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
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#define DCCP_ADD_STATS_BH(field, val) \
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SNMP_ADD_STATS_BH(dccp_statistics, field, val)
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#define DCCP_ADD_STATS_USER(field, val) \
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SNMP_ADD_STATS_USER(dccp_statistics, field, val)
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extern int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb);
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extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
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extern int dccp_send_response(struct sock *sk);
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extern void dccp_send_ack(struct sock *sk);
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extern void dccp_send_delayed_ack(struct sock *sk);
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extern void dccp_send_sync(struct sock *sk, const u64 seq,
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const enum dccp_pkt_type pkt_type);
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extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
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extern void dccp_init_xmit_timers(struct sock *sk);
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static inline void dccp_clear_xmit_timers(struct sock *sk)
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{
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inet_csk_clear_xmit_timers(sk);
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}
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extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
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extern const char *dccp_packet_name(const int type);
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extern const char *dccp_state_name(const int state);
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static inline void dccp_set_state(struct sock *sk, const int state)
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{
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const int oldstate = sk->sk_state;
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dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
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dccp_role(sk), sk,
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dccp_state_name(oldstate), dccp_state_name(state));
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WARN_ON(state == oldstate);
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switch (state) {
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case DCCP_OPEN:
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if (oldstate != DCCP_OPEN)
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DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
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break;
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case DCCP_CLOSED:
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if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
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DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
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sk->sk_prot->unhash(sk);
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if (inet_csk(sk)->icsk_bind_hash != NULL &&
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!(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
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inet_put_port(&dccp_hashinfo, sk);
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/* fall through */
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default:
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if (oldstate == DCCP_OPEN)
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DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
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}
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/* Change state AFTER socket is unhashed to avoid closed
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* socket sitting in hash tables.
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*/
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sk->sk_state = state;
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}
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static inline void dccp_done(struct sock *sk)
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{
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dccp_set_state(sk, DCCP_CLOSED);
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dccp_clear_xmit_timers(sk);
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sk->sk_shutdown = SHUTDOWN_MASK;
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_state_change(sk);
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else
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inet_csk_destroy_sock(sk);
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}
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static inline void dccp_openreq_init(struct request_sock *req,
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struct dccp_sock *dp,
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struct sk_buff *skb)
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{
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/*
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* FIXME: fill in the other req fields from the DCCP options
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* received
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*/
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inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
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inet_rsk(req)->acked = 0;
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req->rcv_wnd = 0;
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}
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extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
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extern struct sock *dccp_create_openreq_child(struct sock *sk,
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const struct request_sock *req,
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const struct sk_buff *skb);
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extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
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extern void dccp_v4_err(struct sk_buff *skb, u32);
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extern int dccp_v4_rcv(struct sk_buff *skb);
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extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
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struct sk_buff *skb,
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struct request_sock *req,
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struct dst_entry *dst);
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extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
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struct request_sock *req,
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struct request_sock **prev);
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extern int dccp_child_process(struct sock *parent, struct sock *child,
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struct sk_buff *skb);
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extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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struct dccp_hdr *dh, unsigned len);
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extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
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const struct dccp_hdr *dh, const unsigned len);
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extern void dccp_close(struct sock *sk, long timeout);
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extern struct sk_buff *dccp_make_response(struct sock *sk,
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struct dst_entry *dst,
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struct request_sock *req);
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extern struct sk_buff *dccp_make_reset(struct sock *sk,
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struct dst_entry *dst,
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enum dccp_reset_codes code);
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extern int dccp_connect(struct sock *sk);
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extern int dccp_disconnect(struct sock *sk, int flags);
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extern int dccp_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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extern int dccp_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int optlen);
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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,
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struct msghdr *msg, size_t size);
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extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len, int nonblock,
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int flags, int *addr_len);
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extern void dccp_shutdown(struct sock *sk, int how);
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extern int dccp_v4_checksum(const struct sk_buff *skb,
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const u32 saddr, const u32 daddr);
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extern int dccp_v4_send_reset(struct sock *sk,
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enum dccp_reset_codes code);
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extern void dccp_send_close(struct sock *sk, const int active);
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struct dccp_skb_cb {
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__u8 dccpd_type;
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__u8 dccpd_reset_code;
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__u8 dccpd_service;
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__u8 dccpd_ccval;
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__u64 dccpd_seq;
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__u64 dccpd_ack_seq;
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int dccpd_opt_len;
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};
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#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
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static inline int dccp_non_data_packet(const struct sk_buff *skb)
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{
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const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
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return type == DCCP_PKT_ACK ||
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type == DCCP_PKT_CLOSE ||
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type == DCCP_PKT_CLOSEREQ ||
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type == DCCP_PKT_RESET ||
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type == DCCP_PKT_SYNC ||
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type == DCCP_PKT_SYNCACK;
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}
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static inline int dccp_packet_without_ack(const struct sk_buff *skb)
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{
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const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
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return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
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}
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#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
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#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
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static inline void dccp_set_seqno(u64 *seqno, u64 value)
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{
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if (value > DCCP_MAX_SEQNO)
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value -= DCCP_MAX_SEQNO + 1;
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*seqno = value;
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}
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static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
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{
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return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
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}
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static inline void dccp_inc_seqno(u64 *seqno)
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{
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if (++*seqno > DCCP_MAX_SEQNO)
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*seqno = 0;
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}
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static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
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{
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struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
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sizeof(*dh));
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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dh->dccph_seq = htonl((gss >> 32)) >> 8;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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dh->dccph_seq = htonl((gss >> 32));
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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dhx->dccph_seq_low = htonl(gss & 0xffffffff);
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}
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static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
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const u64 gsr)
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{
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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dhack->dccph_ack_nr_high = htonl((gsr >> 32));
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#else
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#error "Adjust your <asm/byteorder.h> defines"
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#endif
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dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
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}
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static inline void dccp_update_gsr(struct sock *sk, u64 seq)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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dp->dccps_gsr = seq;
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dccp_set_seqno(&dp->dccps_swl,
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(dp->dccps_gsr + 1 -
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(dp->dccps_options.dccpo_sequence_window / 4)));
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dccp_set_seqno(&dp->dccps_swh,
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(dp->dccps_gsr +
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(3 * dp->dccps_options.dccpo_sequence_window) / 4));
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}
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static inline void dccp_update_gss(struct sock *sk, u64 seq)
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{
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struct dccp_sock *dp = dccp_sk(sk);
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dp->dccps_awh = dp->dccps_gss = seq;
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dccp_set_seqno(&dp->dccps_awl,
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(dp->dccps_gss -
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dp->dccps_options.dccpo_sequence_window + 1));
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}
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extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
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extern void dccp_insert_option_elapsed_time(struct sock *sk,
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struct sk_buff *skb,
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u32 elapsed_time);
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extern void dccp_insert_option_timestamp(struct sock *sk,
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struct sk_buff *skb);
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extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
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unsigned char option,
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const void *value, unsigned char len);
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extern struct socket *dccp_ctl_socket;
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#define DCCP_ACKPKTS_STATE_RECEIVED 0
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#define DCCP_ACKPKTS_STATE_ECN_MARKED (1 << 6)
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#define DCCP_ACKPKTS_STATE_NOT_RECEIVED (3 << 6)
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#define DCCP_ACKPKTS_STATE_MASK 0xC0 /* 11000000 */
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#define DCCP_ACKPKTS_LEN_MASK 0x3F /* 00111111 */
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/** struct dccp_ackpkts - acknowledgeable packets
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*
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* This data structure is the one defined in the DCCP draft
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* Appendix A.
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*
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* @dccpap_buf_head - circular buffer head
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* @dccpap_buf_tail - circular buffer tail
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* @dccpap_buf_ackno - ack # of the most recent packet acknowledgeable in the
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* buffer (i.e. %dccpap_buf_head)
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* @dccpap_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
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* by the buffer with State 0
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*
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* Additionally, the HC-Receiver must keep some information about the
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* Ack Vectors it has recently sent. For each packet sent carrying an
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* Ack Vector, it remembers four variables:
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*
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* @dccpap_ack_seqno - the Sequence Number used for the packet
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* (HC-Receiver seqno)
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* @dccpap_ack_ptr - the value of buf_head at the time of acknowledgement.
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* @dccpap_ack_ackno - the Acknowledgement Number used for the packet
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* (HC-Sender seqno)
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* @dccpap_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
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*
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* @dccpap_buf_len - circular buffer length
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* @dccpap_time - the time in usecs
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* @dccpap_buf - circular buffer of acknowledgeable packets
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*/
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struct dccp_ackpkts {
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unsigned int dccpap_buf_head;
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unsigned int dccpap_buf_tail;
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u64 dccpap_buf_ackno;
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u64 dccpap_ack_seqno;
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u64 dccpap_ack_ackno;
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unsigned int dccpap_ack_ptr;
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unsigned int dccpap_buf_vector_len;
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unsigned int dccpap_ack_vector_len;
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unsigned int dccpap_buf_len;
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struct timeval dccpap_time;
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u8 dccpap_buf_nonce;
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u8 dccpap_ack_nonce;
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u8 dccpap_buf[0];
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};
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extern struct dccp_ackpkts *
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dccp_ackpkts_alloc(unsigned int len,
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const unsigned int __nocast priority);
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extern void dccp_ackpkts_free(struct dccp_ackpkts *ap);
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extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state);
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extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap,
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struct sock *sk, u64 ackno);
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static inline suseconds_t timeval_usecs(const struct timeval *tv)
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{
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return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
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}
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static inline suseconds_t timeval_delta(const struct timeval *large,
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const struct timeval *small)
|
|
{
|
|
time_t secs = large->tv_sec - small->tv_sec;
|
|
suseconds_t usecs = large->tv_usec - small->tv_usec;
|
|
|
|
if (usecs < 0) {
|
|
secs--;
|
|
usecs += USEC_PER_SEC;
|
|
}
|
|
return secs * USEC_PER_SEC + usecs;
|
|
}
|
|
|
|
static inline void timeval_add_usecs(struct timeval *tv,
|
|
const suseconds_t usecs)
|
|
{
|
|
tv->tv_usec += usecs;
|
|
while (tv->tv_usec >= USEC_PER_SEC) {
|
|
tv->tv_sec++;
|
|
tv->tv_usec -= USEC_PER_SEC;
|
|
}
|
|
}
|
|
|
|
static inline void timeval_sub_usecs(struct timeval *tv,
|
|
const suseconds_t usecs)
|
|
{
|
|
tv->tv_usec -= usecs;
|
|
while (tv->tv_usec < 0) {
|
|
tv->tv_sec--;
|
|
tv->tv_usec += USEC_PER_SEC;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Returns the difference in usecs between timeval
|
|
* passed in and current time
|
|
*/
|
|
static inline suseconds_t timeval_now_delta(const struct timeval *tv)
|
|
{
|
|
struct timeval now;
|
|
do_gettimeofday(&now);
|
|
return timeval_delta(&now, tv);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_DCCP_DEBUG
|
|
extern void dccp_ackvector_print(const u64 ackno,
|
|
const unsigned char *vector, int len);
|
|
extern void dccp_ackpkts_print(const struct dccp_ackpkts *ap);
|
|
#else
|
|
static inline void dccp_ackvector_print(const u64 ackno,
|
|
const unsigned char *vector,
|
|
int len) { }
|
|
static inline void dccp_ackpkts_print(const struct dccp_ackpkts *ap) { }
|
|
#endif
|
|
|
|
#endif /* _DCCP_H */
|
|
|