1419 lines
27 KiB
C
1419 lines
27 KiB
C
/* Copyright (C) Charles Forsyth
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* See /doc/license/NOTICE.Plan9-9k.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 9front's team.
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* See /doc/license/9front-mit for details about the licensing.
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* See http://code.9front.org/hg/plan9front/ for a list of authors.
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*/
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "../port/error.h"
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#include "ip.h"
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enum /* Connection state */
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{
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Ilclosed,
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Ilsyncer,
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Ilsyncee,
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Ilestablished,
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Illistening,
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Ilclosing,
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Ilopening, /* only for file server */
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};
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char *ilstates[] =
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{
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"Closed",
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"Syncer",
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"Syncee",
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"Established",
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"Listen",
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"Closing",
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"Opening", /* only for file server */
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};
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enum /* Packet types */
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{
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Ilsync,
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Ildata,
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Ildataquery,
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Ilack,
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Ilquery,
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Ilstate,
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Ilclose,
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};
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char *iltype[] =
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{
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"sync",
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"data",
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"dataquery",
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"ack",
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"query",
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"state",
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"close"
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};
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enum
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{
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Seconds = 1000,
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Iltickms = 50, /* time base */
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AckDelay = 2*Iltickms, /* max time twixt message rcvd & ack sent */
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MaxTimeout = 30*Seconds, /* max time between rexmit */
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QueryTime = 10*Seconds, /* time between subsequent queries */
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DeathTime = 30*QueryTime,
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MaxRexmit = 16, /* max retransmissions before hangup */
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Defaultwin = 20,
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LogAGain = 3,
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AGain = 1<<LogAGain,
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LogDGain = 2,
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DGain = 1<<LogDGain,
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DefByteRate = 100, /* assume a megabit link */
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DefRtt = 50, /* cross country on a great day */
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Maxrq = 64*1024,
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};
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enum
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{
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Nqt= 8,
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};
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typedef struct Ilcb Ilcb;
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struct Ilcb /* Control block */
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{
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int state; /* Connection state */
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Conv *conv;
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QLock ackq; /* Unacknowledged queue */
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Block *unacked;
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Block *unackedtail;
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uint32_t unackedbytes;
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QLock outo; /* Out of order packet queue */
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Block *outoforder;
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uint32_t next; /* Id of next to send */
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uint32_t recvd; /* Last packet received */
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uint32_t acksent; /* Last packet acked */
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uint32_t start; /* Local start id */
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uint32_t rstart; /* Remote start id */
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int window; /* Maximum receive window */
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int rxquery; /* number of queries on this connection */
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int rxtot; /* number of retransmits on this connection */
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int rexmit; /* number of retransmits of *unacked */
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uint32_t qt[Nqt+1]; /* state table for query messages */
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int qtx; /* ... index into qt */
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/* if set, fasttimeout causes a connection request to terminate after 4*Iltickms */
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int fasttimeout;
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/* timers */
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uint32_t lastxmit; /* time of last xmit */
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uint32_t lastrecv; /* time of last recv */
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uint32_t timeout; /* retransmission time for *unacked */
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uint32_t acktime; /* time to send next ack */
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uint32_t querytime; /* time to send next query */
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/* adaptive measurements */
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int delay; /* Average of the fixed rtt delay */
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int rate; /* Average uint8_t rate */
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int mdev; /* Mean deviation of rtt */
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int maxrtt; /* largest rtt seen */
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uint32_t rttack; /* The ack we are waiting for */
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int rttlen; /* Length of rttack packet */
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uint64_t rttstart; /* Time we issued rttack packet */
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};
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enum
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{
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IL_IPSIZE = 20,
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IL_HDRSIZE = 18,
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IL_LISTEN = 0,
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IL_CONNECT = 1,
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IP_ILPROTO = 40,
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};
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typedef struct Ilhdr Ilhdr;
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struct Ilhdr
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{
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uint8_t vihl; /* Version and header length */
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uint8_t tos; /* Type of service */
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uint8_t length[2]; /* packet length */
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uint8_t id[2]; /* Identification */
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uint8_t frag[2]; /* Fragment information */
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uint8_t ttl; /* Time to live */
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uint8_t proto; /* Protocol */
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uint8_t cksum[2]; /* Header checksum */
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uint8_t src[4]; /* Ip source */
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uint8_t dst[4]; /* Ip destination */
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uint8_t ilsum[2]; /* Checksum including header */
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uint8_t illen[2]; /* Packet length */
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uint8_t iltype; /* Packet type */
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uint8_t ilspec; /* Special */
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uint8_t ilsrc[2]; /* Src port */
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uint8_t ildst[2]; /* Dst port */
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uint8_t ilid[4]; /* Sequence id */
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uint8_t ilack[4]; /* Acked sequence */
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};
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enum
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{
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InMsgs,
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OutMsgs,
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CsumErrs, /* checksum errors */
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HlenErrs, /* header length error */
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LenErrs, /* short packet */
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OutOfOrder, /* out of order */
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Retrans, /* retransmissions */
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DupMsg,
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DupBytes,
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DroppedMsgs,
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Nstats,
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};
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static char *statnames[] =
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{
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[InMsgs] "InMsgs",
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[OutMsgs] "OutMsgs",
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[CsumErrs] "CsumErrs",
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[HlenErrs] "HlenErr",
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[LenErrs] "LenErrs",
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[OutOfOrder] "OutOfOrder",
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[Retrans] "Retrans",
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[DupMsg] "DupMsg",
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[DupBytes] "DupBytes",
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[DroppedMsgs] "DroppedMsgs",
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};
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typedef struct Ilpriv Ilpriv;
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struct Ilpriv
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{
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Ipht ht;
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uint32_t stats[Nstats];
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uint32_t csumerr; /* checksum errors */
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uint32_t hlenerr; /* header length error */
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uint32_t lenerr; /* short packet */
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uint32_t order; /* out of order */
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uint32_t rexmit; /* retransmissions */
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uint32_t dup;
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uint32_t dupb;
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/* keeping track of the ack kproc */
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int ackprocstarted;
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QLock apl;
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};
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/* state for query/dataquery messages */
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void ilrcvmsg(Conv*, Block*);
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void ilsendctl(Conv*, Ilhdr*, int, uint32_t, uint32_t, int);
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void ilackq(Ilcb*, Block*);
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void ilprocess(Conv*, Ilhdr*, Block*);
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void ilpullup(Conv*);
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void ilhangup(Conv*, char*);
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void ilfreeq(Ilcb*);
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void ilrexmit(Ilcb*);
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void ilbackoff(Ilcb*);
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void ilsettimeout(Ilcb*);
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char* ilstart(Conv*, int, int);
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void ilackproc(void*);
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void iloutoforder(Conv*, Ilhdr*, Block*);
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void iliput(Proto*, Ipifc*, Block*);
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void iladvise(Proto*, Block*, char*);
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int ilnextqt(Ilcb*);
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void ilcbinit(Ilcb*);
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int later(uint32_t, uint32_t, char*);
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void ilreject(Fs*, Ilhdr*);
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void illocalclose(Conv *c);
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int ilcksum = 1;
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static int initseq = 25001;
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static uint32_t scalediv, scalemul;
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static char *etime = "connection timed out";
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static char*
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ilconnect(Conv *c, char **argv, int argc)
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{
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char *e, *p;
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int fast;
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/* huge hack to quickly try an il connection */
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fast = 0;
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if(argc > 1){
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p = jehanne_strstr(argv[1], "!fasttimeout");
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if(p != nil){
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*p = 0;
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fast = 1;
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}
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}
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e = Fsstdconnect(c, argv, argc);
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if(e != nil)
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return e;
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return ilstart(c, IL_CONNECT, fast);
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}
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static int
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ilstate(Conv *c, char *state, int n)
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{
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Ilcb *ic;
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ic = (Ilcb*)(c->ptcl);
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return jehanne_snprint(state, n, "%s qin %d qout %d del %5.5d Br %5.5d md %5.5d una %5.5lud rex %5.5d rxq %5.5d max %5.5d\n",
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ilstates[ic->state],
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c->rq ? qlen(c->rq) : 0,
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c->wq ? qlen(c->wq) : 0,
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ic->delay>>LogAGain, ic->rate>>LogAGain, ic->mdev>>LogDGain,
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ic->unackedbytes, ic->rxtot, ic->rxquery, ic->maxrtt);
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}
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static int
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ilinuse(Conv *c)
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{
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Ilcb *ic;
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ic = (Ilcb*)(c->ptcl);
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return ic->state != Ilclosed;
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}
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/* called with c locked */
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static char*
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ilannounce(Conv *c, char **argv, int argc)
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{
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char *e;
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e = Fsstdannounce(c, argv, argc);
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if(e != nil)
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return e;
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e = ilstart(c, IL_LISTEN, 0);
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if(e != nil)
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return e;
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Fsconnected(c, nil);
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return nil;
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}
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void
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illocalclose(Conv *c)
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{
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Ilcb *ic;
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Ilpriv *ipriv;
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ipriv = c->p->priv;
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ic = (Ilcb*)c->ptcl;
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ic->state = Ilclosed;
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iphtrem(&ipriv->ht, c);
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ipmove(c->laddr, IPnoaddr);
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c->lport = 0;
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}
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static void
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ilclose(Conv *c)
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{
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Ilcb *ic;
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ic = (Ilcb*)c->ptcl;
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qclose(c->rq);
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qclose(c->wq);
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qclose(c->eq);
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switch(ic->state) {
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case Ilclosing:
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case Ilclosed:
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break;
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case Ilsyncer:
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case Ilsyncee:
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case Ilestablished:
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ic->state = Ilclosing;
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ilsettimeout(ic);
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ilsendctl(c, nil, Ilclose, ic->next, ic->recvd, 0);
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break;
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case Illistening:
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illocalclose(c);
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break;
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}
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ilfreeq(ic);
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}
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void
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ilkick(void *x, Block *bp)
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{
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Conv *c = x;
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Ilhdr *ih;
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Ilcb *ic;
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int dlen;
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uint32_t id, ack;
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Fs *f;
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Ilpriv *priv;
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f = c->p->f;
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priv = c->p->priv;
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ic = (Ilcb*)c->ptcl;
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if(bp == nil)
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return;
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switch(ic->state) {
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case Ilclosed:
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case Illistening:
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case Ilclosing:
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freeblist(bp);
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qhangup(c->rq, nil);
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return;
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}
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dlen = blocklen(bp);
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/* Make space to fit il & ip */
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bp = padblock(bp, IL_IPSIZE+IL_HDRSIZE);
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ih = (Ilhdr *)(bp->rp);
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ih->vihl = IP_VER4;
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/* Ip fields */
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ih->frag[0] = 0;
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ih->frag[1] = 0;
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v6tov4(ih->dst, c->raddr);
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v6tov4(ih->src, c->laddr);
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ih->proto = IP_ILPROTO;
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/* Il fields */
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hnputs(ih->illen, dlen+IL_HDRSIZE);
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hnputs(ih->ilsrc, c->lport);
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hnputs(ih->ildst, c->rport);
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qlock(&ic->ackq);
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id = ic->next++;
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hnputl(ih->ilid, id);
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ack = ic->recvd;
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hnputl(ih->ilack, ack);
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ic->acksent = ack;
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ic->acktime = NOW + AckDelay;
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ih->iltype = Ildata;
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ih->ilspec = 0;
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ih->ilsum[0] = 0;
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ih->ilsum[1] = 0;
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/* Checksum of ilheader plus data (not ip & no pseudo header) */
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if(ilcksum)
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hnputs(ih->ilsum, ptclcsum(bp, IL_IPSIZE, dlen+IL_HDRSIZE));
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ilackq(ic, bp);
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qunlock(&ic->ackq);
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/* Start the round trip timer for this packet if the timer is free */
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if(ic->rttack == 0) {
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ic->rttack = id;
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ic->rttstart = fastticks(nil);
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ic->rttlen = dlen + IL_IPSIZE + IL_HDRSIZE;
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}
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if(later(NOW, ic->timeout, nil))
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ilsettimeout(ic);
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ipoput4(f, bp, 0, c->ttl, c->tos, c);
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priv->stats[OutMsgs]++;
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}
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static void
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ilcreate(Conv *c)
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{
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c->rq = qopen(Maxrq, 0, 0, c);
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c->wq = qbypass(ilkick, c);
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}
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int
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ilxstats(Proto *il, char *buf, int len)
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{
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Ilpriv *priv;
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char *p, *e;
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int i;
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priv = il->priv;
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p = buf;
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e = p+len;
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for(i = 0; i < Nstats; i++)
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p = jehanne_seprint(p, e, "%s: %lud\n", statnames[i], priv->stats[i]);
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return p - buf;
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}
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void
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ilackq(Ilcb *ic, Block *bp)
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{
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Block *np;
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int n;
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n = blocklen(bp);
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/* Enqueue a copy on the unacked queue in case this one gets lost */
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np = copyblock(bp, n);
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if(ic->unacked)
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ic->unackedtail->list = np;
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else
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ic->unacked = np;
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ic->unackedtail = np;
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np->list = nil;
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ic->unackedbytes += n;
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}
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static
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void
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ilrttcalc(Ilcb *ic, Block *bp)
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{
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int rtt, tt, pt, delay, rate;
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rtt = fastticks(nil) - ic->rttstart;
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rtt = (rtt*scalemul)/scalediv;
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delay = ic->delay;
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rate = ic->rate;
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/* Guard against zero wrap */
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if(rtt > 120000 || rtt < 0)
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return;
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/* this block had to be transmitted after the one acked so count its size */
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ic->rttlen += blocklen(bp) + IL_IPSIZE + IL_HDRSIZE;
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if(ic->rttlen < 256){
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/* guess fixed delay as rtt of small packets */
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delay += rtt - (delay>>LogAGain);
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if(delay < AGain)
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delay = AGain;
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ic->delay = delay;
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} else {
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/* if packet took longer than avg rtt delay, recalc rate */
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tt = rtt - (delay>>LogAGain);
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if(tt > 0){
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rate += ic->rttlen/tt - (rate>>LogAGain);
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if(rate < AGain)
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rate = AGain;
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ic->rate = rate;
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}
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}
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/* mdev */
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pt = ic->rttlen/(rate>>LogAGain) + (delay>>LogAGain);
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ic->mdev += jehanne_abs(rtt-pt) - (ic->mdev>>LogDGain);
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if(rtt > ic->maxrtt)
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ic->maxrtt = rtt;
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}
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void
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ilackto(Ilcb *ic, uint32_t ackto, Block *bp)
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{
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Ilhdr *h;
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uint32_t id;
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if(ic->rttack == ackto)
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ilrttcalc(ic, bp);
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/* Cancel if we've passed the packet we were interested in */
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if(ic->rttack <= ackto)
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ic->rttack = 0;
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qlock(&ic->ackq);
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while(ic->unacked) {
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h = (Ilhdr *)ic->unacked->rp;
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id = nhgetl(h->ilid);
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if(ackto < id)
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break;
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bp = ic->unacked;
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ic->unacked = bp->list;
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bp->list = nil;
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ic->unackedbytes -= blocklen(bp);
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freeblist(bp);
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ic->rexmit = 0;
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ilsettimeout(ic);
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}
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qunlock(&ic->ackq);
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}
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|
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void
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iliput(Proto *il, Ipifc*, Block *bp)
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{
|
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char *st;
|
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Ilcb *ic;
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Ilhdr *ih;
|
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uint8_t raddr[IPaddrlen];
|
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uint8_t laddr[IPaddrlen];
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uint16_t sp, dp, csum;
|
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int plen, illen;
|
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Conv *new, *s;
|
|
Ilpriv *ipriv;
|
|
|
|
ipriv = il->priv;
|
|
|
|
ih = (Ilhdr *)bp->rp;
|
|
plen = blocklen(bp);
|
|
if(plen < IL_IPSIZE+IL_HDRSIZE){
|
|
netlog(il->f, Logil, "il: hlenerr\n");
|
|
ipriv->stats[HlenErrs]++;
|
|
goto raise;
|
|
}
|
|
|
|
illen = nhgets(ih->illen);
|
|
if(illen+IL_IPSIZE > plen){
|
|
netlog(il->f, Logil, "il: lenerr\n");
|
|
ipriv->stats[LenErrs]++;
|
|
goto raise;
|
|
}
|
|
|
|
sp = nhgets(ih->ildst);
|
|
dp = nhgets(ih->ilsrc);
|
|
v4tov6(raddr, ih->src);
|
|
v4tov6(laddr, ih->dst);
|
|
|
|
if((csum = ptclcsum(bp, IL_IPSIZE, illen)) != 0) {
|
|
if(ih->iltype > Ilclose)
|
|
st = "?";
|
|
else
|
|
st = iltype[ih->iltype];
|
|
ipriv->stats[CsumErrs]++;
|
|
netlog(il->f, Logil, "il: cksum %ux, pkt(%s id %ud ack %ud %I/%d->%d)\n",
|
|
csum, st, nhgetl(ih->ilid), nhgetl(ih->ilack), raddr, sp, dp);
|
|
goto raise;
|
|
}
|
|
|
|
qlock(il);
|
|
s = iphtlook(&ipriv->ht, raddr, dp, laddr, sp);
|
|
if(s == nil){
|
|
if(ih->iltype == Ilsync)
|
|
ilreject(il->f, ih); /* no listener */
|
|
qunlock(il);
|
|
goto raise;
|
|
}
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
if(ic->state == Illistening){
|
|
if(ih->iltype != Ilsync){
|
|
qunlock(il);
|
|
if(ih->iltype > Ilclose)
|
|
st = "?";
|
|
else
|
|
st = iltype[ih->iltype];
|
|
ilreject(il->f, ih); /* no channel and not sync */
|
|
netlog(il->f, Logil, "il: no channel, pkt(%s id %ud ack %ud %I/%ud->%ud)\n",
|
|
st, nhgetl(ih->ilid), nhgetl(ih->ilack), raddr, sp, dp);
|
|
goto raise;
|
|
}
|
|
|
|
new = Fsnewcall(s, raddr, dp, laddr, sp, V4);
|
|
if(new == nil){
|
|
qunlock(il);
|
|
netlog(il->f, Logil, "il: bad newcall %I/%ud->%ud\n", raddr, sp, dp);
|
|
ilsendctl(s, ih, Ilclose, 0, nhgetl(ih->ilid), 0);
|
|
goto raise;
|
|
}
|
|
s = new;
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
|
|
ic->conv = s;
|
|
ic->state = Ilsyncee;
|
|
ilcbinit(ic);
|
|
ic->rstart = nhgetl(ih->ilid);
|
|
iphtadd(&ipriv->ht, s);
|
|
}
|
|
|
|
qlock(s);
|
|
qunlock(il);
|
|
if(waserror()){
|
|
qunlock(s);
|
|
nexterror();
|
|
}
|
|
ilprocess(s, ih, bp);
|
|
qunlock(s);
|
|
poperror();
|
|
return;
|
|
raise:
|
|
freeblist(bp);
|
|
}
|
|
|
|
void
|
|
_ilprocess(Conv *s, Ilhdr *h, Block *bp)
|
|
{
|
|
Ilcb *ic;
|
|
uint32_t id, ack;
|
|
Ilpriv *priv;
|
|
|
|
id = nhgetl(h->ilid);
|
|
ack = nhgetl(h->ilack);
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
|
|
ic->lastrecv = NOW;
|
|
ic->querytime = NOW + QueryTime;
|
|
priv = s->p->priv;
|
|
priv->stats[InMsgs]++;
|
|
|
|
switch(ic->state) {
|
|
default:
|
|
netlog(s->p->f, Logil, "il: unknown state %d\n", ic->state);
|
|
case Ilclosed:
|
|
freeblist(bp);
|
|
break;
|
|
case Ilsyncer:
|
|
switch(h->iltype) {
|
|
default:
|
|
break;
|
|
case Ilsync:
|
|
if(ack != ic->start)
|
|
ilhangup(s, "connection rejected");
|
|
else {
|
|
ic->recvd = id;
|
|
ic->rstart = id;
|
|
ilsendctl(s, nil, Ilack, ic->next, ic->recvd, 0);
|
|
ic->state = Ilestablished;
|
|
ic->fasttimeout = 0;
|
|
ic->rexmit = 0;
|
|
Fsconnected(s, nil);
|
|
ilpullup(s);
|
|
}
|
|
break;
|
|
case Ilclose:
|
|
if(ack == ic->start)
|
|
ilhangup(s, "connection rejected");
|
|
break;
|
|
}
|
|
freeblist(bp);
|
|
break;
|
|
case Ilsyncee:
|
|
switch(h->iltype) {
|
|
default:
|
|
break;
|
|
case Ilsync:
|
|
if(id != ic->rstart || ack != 0){
|
|
illocalclose(s);
|
|
} else {
|
|
ic->recvd = id;
|
|
ilsendctl(s, nil, Ilsync, ic->start, ic->recvd, 0);
|
|
}
|
|
break;
|
|
case Ilack:
|
|
if(ack == ic->start) {
|
|
ic->state = Ilestablished;
|
|
ic->fasttimeout = 0;
|
|
ic->rexmit = 0;
|
|
ilpullup(s);
|
|
}
|
|
break;
|
|
case Ildata:
|
|
if(ack == ic->start) {
|
|
ic->state = Ilestablished;
|
|
ic->fasttimeout = 0;
|
|
ic->rexmit = 0;
|
|
goto established;
|
|
}
|
|
break;
|
|
case Ilclose:
|
|
if(ack == ic->start)
|
|
ilhangup(s, "remote close");
|
|
break;
|
|
}
|
|
freeblist(bp);
|
|
break;
|
|
case Ilestablished:
|
|
established:
|
|
switch(h->iltype) {
|
|
case Ilsync:
|
|
if(id != ic->rstart)
|
|
ilhangup(s, "remote close");
|
|
else
|
|
ilsendctl(s, nil, Ilack, ic->next, ic->rstart, 0);
|
|
freeblist(bp);
|
|
break;
|
|
case Ildata:
|
|
/*
|
|
* avoid consuming all the mount rpc buffers in the
|
|
* system. if the input queue is too long, drop this
|
|
* packet.
|
|
*/
|
|
if (s->rq && qlen(s->rq) >= Maxrq) {
|
|
priv->stats[DroppedMsgs]++;
|
|
freeblist(bp);
|
|
break;
|
|
}
|
|
|
|
ilackto(ic, ack, bp);
|
|
iloutoforder(s, h, bp);
|
|
ilpullup(s);
|
|
break;
|
|
case Ildataquery:
|
|
ilackto(ic, ack, bp);
|
|
iloutoforder(s, h, bp);
|
|
ilpullup(s);
|
|
ilsendctl(s, nil, Ilstate, ic->next, ic->recvd, h->ilspec);
|
|
break;
|
|
case Ilack:
|
|
ilackto(ic, ack, bp);
|
|
freeblist(bp);
|
|
break;
|
|
case Ilquery:
|
|
ilackto(ic, ack, bp);
|
|
ilsendctl(s, nil, Ilstate, ic->next, ic->recvd, h->ilspec);
|
|
freeblist(bp);
|
|
break;
|
|
case Ilstate:
|
|
if(ack >= ic->rttack)
|
|
ic->rttack = 0;
|
|
ilackto(ic, ack, bp);
|
|
if(h->ilspec > Nqt)
|
|
h->ilspec = 0;
|
|
if(ic->qt[h->ilspec] > ack){
|
|
ilrexmit(ic);
|
|
ilsettimeout(ic);
|
|
}
|
|
freeblist(bp);
|
|
break;
|
|
case Ilclose:
|
|
freeblist(bp);
|
|
if(ack < ic->start || ack > ic->next)
|
|
break;
|
|
ic->recvd = id;
|
|
ilsendctl(s, nil, Ilclose, ic->next, ic->recvd, 0);
|
|
ic->state = Ilclosing;
|
|
ilsettimeout(ic);
|
|
ilfreeq(ic);
|
|
break;
|
|
}
|
|
break;
|
|
case Illistening:
|
|
freeblist(bp);
|
|
break;
|
|
case Ilclosing:
|
|
switch(h->iltype) {
|
|
case Ilclose:
|
|
ic->recvd = id;
|
|
ilsendctl(s, nil, Ilclose, ic->next, ic->recvd, 0);
|
|
if(ack == ic->next)
|
|
ilhangup(s, nil);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
freeblist(bp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ilrexmit(Ilcb *ic)
|
|
{
|
|
Ilhdr *h;
|
|
Block *nb;
|
|
Conv *c;
|
|
uint32_t id;
|
|
Ilpriv *priv;
|
|
|
|
nb = nil;
|
|
qlock(&ic->ackq);
|
|
if(ic->unacked)
|
|
nb = copyblock(ic->unacked, blocklen(ic->unacked));
|
|
qunlock(&ic->ackq);
|
|
|
|
if(nb == nil)
|
|
return;
|
|
|
|
h = (Ilhdr*)nb->rp;
|
|
h->vihl = IP_VER4;
|
|
|
|
h->iltype = Ildataquery;
|
|
hnputl(h->ilack, ic->recvd);
|
|
h->ilspec = ilnextqt(ic);
|
|
h->ilsum[0] = 0;
|
|
h->ilsum[1] = 0;
|
|
hnputs(h->ilsum, ptclcsum(nb, IL_IPSIZE, nhgets(h->illen)));
|
|
|
|
c = ic->conv;
|
|
id = nhgetl(h->ilid);
|
|
netlog(c->p->f, Logil, "il: rexmit %lud %lud: %d %lud: %I %ud/%ud\n", id, ic->recvd,
|
|
ic->rexmit, ic->timeout,
|
|
c->raddr, c->lport, c->rport);
|
|
|
|
ilbackoff(ic);
|
|
|
|
ipoput4(c->p->f, nb, 0, c->ttl, c->tos, c);
|
|
|
|
/* statistics */
|
|
ic->rxtot++;
|
|
priv = c->p->priv;
|
|
priv->rexmit++;
|
|
}
|
|
|
|
/* DEBUG */
|
|
void
|
|
ilprocess(Conv *s, Ilhdr *h, Block *bp)
|
|
{
|
|
Ilcb *ic;
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
|
|
USED(ic);
|
|
netlog(s->p->f, Logilmsg, "%11s rcv %lud/%lud snt %lud/%lud pkt(%s id %ud ack %ud %ud->%ud) ",
|
|
ilstates[ic->state], ic->rstart, ic->recvd, ic->start,
|
|
ic->next, iltype[h->iltype], nhgetl(h->ilid),
|
|
nhgetl(h->ilack), nhgets(h->ilsrc), nhgets(h->ildst));
|
|
|
|
_ilprocess(s, h, bp);
|
|
|
|
netlog(s->p->f, Logilmsg, "%11s rcv %lud snt %lud\n", ilstates[ic->state], ic->recvd, ic->next);
|
|
}
|
|
|
|
void
|
|
ilhangup(Conv *s, char *msg)
|
|
{
|
|
Ilcb *ic;
|
|
int callout;
|
|
|
|
netlog(s->p->f, Logil, "il: hangup! %I %d/%d: %s\n", s->raddr,
|
|
s->lport, s->rport, msg?msg:"no reason");
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
callout = ic->state == Ilsyncer;
|
|
illocalclose(s);
|
|
|
|
qhangup(s->rq, msg);
|
|
qhangup(s->wq, msg);
|
|
|
|
if(callout)
|
|
Fsconnected(s, msg);
|
|
}
|
|
|
|
void
|
|
ilpullup(Conv *s)
|
|
{
|
|
Ilcb *ic;
|
|
Ilhdr *oh;
|
|
Block *bp;
|
|
uint32_t oid, dlen;
|
|
Ilpriv *ipriv;
|
|
|
|
ic = (Ilcb*)s->ptcl;
|
|
if(ic->state != Ilestablished)
|
|
return;
|
|
|
|
qlock(&ic->outo);
|
|
while(ic->outoforder) {
|
|
bp = ic->outoforder;
|
|
oh = (Ilhdr*)bp->rp;
|
|
oid = nhgetl(oh->ilid);
|
|
if(oid <= ic->recvd) {
|
|
ic->outoforder = bp->list;
|
|
freeblist(bp);
|
|
continue;
|
|
}
|
|
if(oid != ic->recvd+1){
|
|
ipriv = s->p->priv;
|
|
ipriv->stats[OutOfOrder]++;
|
|
break;
|
|
}
|
|
|
|
ic->recvd = oid;
|
|
ic->outoforder = bp->list;
|
|
|
|
bp->list = nil;
|
|
dlen = nhgets(oh->illen)-IL_HDRSIZE;
|
|
bp = trimblock(bp, IL_IPSIZE+IL_HDRSIZE, dlen);
|
|
/*
|
|
* Upper levels don't know about multiple-block
|
|
* messages so copy all into one (yick).
|
|
*/
|
|
bp = concatblock(bp);
|
|
if(bp == 0)
|
|
panic("ilpullup");
|
|
bp = packblock(bp);
|
|
if(bp == 0)
|
|
panic("ilpullup2");
|
|
qpass(s->rq, bp);
|
|
}
|
|
qunlock(&ic->outo);
|
|
}
|
|
|
|
void
|
|
iloutoforder(Conv *s, Ilhdr *h, Block *bp)
|
|
{
|
|
Ilcb *ic;
|
|
uint8_t *lid;
|
|
Block *f, **l;
|
|
uint32_t id, newid;
|
|
Ilpriv *ipriv;
|
|
|
|
ipriv = s->p->priv;
|
|
ic = (Ilcb*)s->ptcl;
|
|
bp->list = nil;
|
|
|
|
id = nhgetl(h->ilid);
|
|
/* Window checks */
|
|
if(id <= ic->recvd || id > ic->recvd+ic->window) {
|
|
netlog(s->p->f, Logil, "il: message outside window %lud <%lud-%lud>: %I %d/%d\n",
|
|
id, ic->recvd, ic->recvd+ic->window, s->raddr, s->lport, s->rport);
|
|
freeblist(bp);
|
|
return;
|
|
}
|
|
|
|
/* Packet is acceptable so sort onto receive queue for pullup */
|
|
qlock(&ic->outo);
|
|
if(ic->outoforder == nil)
|
|
ic->outoforder = bp;
|
|
else {
|
|
l = &ic->outoforder;
|
|
for(f = *l; f; f = f->list) {
|
|
lid = ((Ilhdr*)(f->rp))->ilid;
|
|
newid = nhgetl(lid);
|
|
if(id <= newid) {
|
|
if(id == newid) {
|
|
ipriv->stats[DupMsg]++;
|
|
ipriv->stats[DupBytes] += blocklen(bp);
|
|
qunlock(&ic->outo);
|
|
freeblist(bp);
|
|
return;
|
|
}
|
|
bp->list = f;
|
|
*l = bp;
|
|
qunlock(&ic->outo);
|
|
return;
|
|
}
|
|
l = &f->list;
|
|
}
|
|
*l = bp;
|
|
}
|
|
qunlock(&ic->outo);
|
|
}
|
|
|
|
void
|
|
ilsendctl(Conv *ipc, Ilhdr *inih, int type, uint32_t id, uint32_t ack, int ilspec)
|
|
{
|
|
Ilhdr *ih;
|
|
Ilcb *ic;
|
|
Block *bp;
|
|
int ttl, tos;
|
|
|
|
bp = allocb(IL_IPSIZE+IL_HDRSIZE);
|
|
bp->wp += IL_IPSIZE+IL_HDRSIZE;
|
|
|
|
ih = (Ilhdr *)(bp->rp);
|
|
ih->vihl = IP_VER4;
|
|
|
|
/* Ip fields */
|
|
ih->proto = IP_ILPROTO;
|
|
hnputs(ih->illen, IL_HDRSIZE);
|
|
ih->frag[0] = 0;
|
|
ih->frag[1] = 0;
|
|
if(inih) {
|
|
hnputl(ih->dst, nhgetl(inih->src));
|
|
hnputl(ih->src, nhgetl(inih->dst));
|
|
hnputs(ih->ilsrc, nhgets(inih->ildst));
|
|
hnputs(ih->ildst, nhgets(inih->ilsrc));
|
|
hnputl(ih->ilid, nhgetl(inih->ilack));
|
|
hnputl(ih->ilack, nhgetl(inih->ilid));
|
|
ttl = MAXTTL;
|
|
tos = DFLTTOS;
|
|
}
|
|
else {
|
|
v6tov4(ih->dst, ipc->raddr);
|
|
v6tov4(ih->src, ipc->laddr);
|
|
hnputs(ih->ilsrc, ipc->lport);
|
|
hnputs(ih->ildst, ipc->rport);
|
|
hnputl(ih->ilid, id);
|
|
hnputl(ih->ilack, ack);
|
|
ic = (Ilcb*)ipc->ptcl;
|
|
ic->acksent = ack;
|
|
ic->acktime = NOW;
|
|
ttl = ipc->ttl;
|
|
tos = ipc->tos;
|
|
}
|
|
ih->iltype = type;
|
|
ih->ilspec = ilspec;
|
|
ih->ilsum[0] = 0;
|
|
ih->ilsum[1] = 0;
|
|
|
|
if(ilcksum)
|
|
hnputs(ih->ilsum, ptclcsum(bp, IL_IPSIZE, IL_HDRSIZE));
|
|
|
|
if(ipc==nil)
|
|
panic("ipc is nil caller is %#p", getcallerpc());
|
|
if(ipc->p==nil)
|
|
panic("ipc->p is nil");
|
|
|
|
netlog(ipc->p->f, Logilmsg, "ctl(%s id %d ack %d %d->%d)\n",
|
|
iltype[ih->iltype], nhgetl(ih->ilid), nhgetl(ih->ilack),
|
|
nhgets(ih->ilsrc), nhgets(ih->ildst));
|
|
|
|
ipoput4(ipc->p->f, bp, 0, ttl, tos, ipc);
|
|
}
|
|
|
|
void
|
|
ilreject(Fs *f, Ilhdr *inih)
|
|
{
|
|
Ilhdr *ih;
|
|
Block *bp;
|
|
|
|
bp = allocb(IL_IPSIZE+IL_HDRSIZE);
|
|
bp->wp += IL_IPSIZE+IL_HDRSIZE;
|
|
|
|
ih = (Ilhdr *)(bp->rp);
|
|
ih->vihl = IP_VER4;
|
|
|
|
/* Ip fields */
|
|
ih->proto = IP_ILPROTO;
|
|
hnputs(ih->illen, IL_HDRSIZE);
|
|
ih->frag[0] = 0;
|
|
ih->frag[1] = 0;
|
|
hnputl(ih->dst, nhgetl(inih->src));
|
|
hnputl(ih->src, nhgetl(inih->dst));
|
|
hnputs(ih->ilsrc, nhgets(inih->ildst));
|
|
hnputs(ih->ildst, nhgets(inih->ilsrc));
|
|
hnputl(ih->ilid, nhgetl(inih->ilack));
|
|
hnputl(ih->ilack, nhgetl(inih->ilid));
|
|
ih->iltype = Ilclose;
|
|
ih->ilspec = 0;
|
|
ih->ilsum[0] = 0;
|
|
ih->ilsum[1] = 0;
|
|
|
|
if(ilcksum)
|
|
hnputs(ih->ilsum, ptclcsum(bp, IL_IPSIZE, IL_HDRSIZE));
|
|
|
|
ipoput4(f, bp, 0, MAXTTL, DFLTTOS, nil);
|
|
}
|
|
|
|
void
|
|
ilsettimeout(Ilcb *ic)
|
|
{
|
|
uint32_t pt;
|
|
|
|
pt = (ic->delay>>LogAGain)
|
|
+ ic->unackedbytes/(ic->rate>>LogAGain)
|
|
+ (ic->mdev>>(LogDGain-1))
|
|
+ AckDelay;
|
|
if(pt > MaxTimeout)
|
|
pt = MaxTimeout;
|
|
ic->timeout = NOW + pt;
|
|
}
|
|
|
|
void
|
|
ilbackoff(Ilcb *ic)
|
|
{
|
|
uint32_t pt;
|
|
int i;
|
|
|
|
pt = (ic->delay>>LogAGain)
|
|
+ ic->unackedbytes/(ic->rate>>LogAGain)
|
|
+ (ic->mdev>>(LogDGain-1))
|
|
+ AckDelay;
|
|
for(i = 0; i < ic->rexmit; i++)
|
|
pt = pt + (pt>>1);
|
|
if(pt > MaxTimeout)
|
|
pt = MaxTimeout;
|
|
ic->timeout = NOW + pt;
|
|
|
|
if(ic->fasttimeout)
|
|
ic->timeout = NOW+Iltickms;
|
|
|
|
ic->rexmit++;
|
|
}
|
|
|
|
// complain if two numbers not within an hour of each other
|
|
#define Tfuture (1000*60*60)
|
|
int
|
|
later(uint32_t t1, uint32_t t2, char *x)
|
|
{
|
|
int dt;
|
|
|
|
dt = t1 - t2;
|
|
if(dt > 0) {
|
|
if(x != nil && dt > Tfuture)
|
|
jehanne_print("%s: way future %d\n", x, dt);
|
|
return 1;
|
|
}
|
|
if(dt < -Tfuture) {
|
|
if(x != nil)
|
|
jehanne_print("%s: way past %d\n", x, -dt);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
ilackproc(void *x)
|
|
{
|
|
Ilcb *ic;
|
|
Conv **s, *p;
|
|
Proto *il;
|
|
|
|
il = x;
|
|
|
|
loop:
|
|
tsleep(&up->sleep, return0, 0, Iltickms);
|
|
for(s = il->conv; s && *s; s++) {
|
|
p = *s;
|
|
ic = (Ilcb*)p->ptcl;
|
|
|
|
switch(ic->state) {
|
|
case Ilclosed:
|
|
case Illistening:
|
|
break;
|
|
case Ilclosing:
|
|
if(later(NOW, ic->timeout, "timeout0")) {
|
|
if(ic->rexmit > MaxRexmit){
|
|
ilhangup(p, nil);
|
|
break;
|
|
}
|
|
ilsendctl(p, nil, Ilclose, ic->next, ic->recvd, 0);
|
|
ilbackoff(ic);
|
|
}
|
|
break;
|
|
|
|
case Ilsyncee:
|
|
case Ilsyncer:
|
|
if(later(NOW, ic->timeout, "timeout1")) {
|
|
if(ic->rexmit > MaxRexmit){
|
|
ilhangup(p, etime);
|
|
break;
|
|
}
|
|
ilsendctl(p, nil, Ilsync, ic->start, ic->recvd, 0);
|
|
ilbackoff(ic);
|
|
}
|
|
break;
|
|
|
|
case Ilestablished:
|
|
if(ic->recvd != ic->acksent)
|
|
if(later(NOW, ic->acktime, "acktime"))
|
|
ilsendctl(p, nil, Ilack, ic->next, ic->recvd, 0);
|
|
|
|
if(later(NOW, ic->querytime, "querytime")){
|
|
if(later(NOW, ic->lastrecv+DeathTime, "deathtime")){
|
|
netlog(il->f, Logil, "il: hangup: deathtime\n");
|
|
ilhangup(p, etime);
|
|
break;
|
|
}
|
|
ilsendctl(p, nil, Ilquery, ic->next, ic->recvd, ilnextqt(ic));
|
|
ic->querytime = NOW + QueryTime;
|
|
}
|
|
|
|
if(ic->unacked != nil)
|
|
if(later(NOW, ic->timeout, "timeout2")) {
|
|
if(ic->rexmit > MaxRexmit){
|
|
netlog(il->f, Logil, "il: hangup: too many rexmits\n");
|
|
ilhangup(p, etime);
|
|
break;
|
|
}
|
|
ilsendctl(p, nil, Ilquery, ic->next, ic->recvd, ilnextqt(ic));
|
|
ic->rxquery++;
|
|
ilbackoff(ic);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
goto loop;
|
|
}
|
|
|
|
void
|
|
ilcbinit(Ilcb *ic)
|
|
{
|
|
ic->start = nrand(0x1000000);
|
|
ic->next = ic->start+1;
|
|
ic->recvd = 0;
|
|
ic->window = Defaultwin;
|
|
ic->unackedbytes = 0;
|
|
ic->unacked = nil;
|
|
ic->outoforder = nil;
|
|
ic->rexmit = 0;
|
|
ic->rxtot = 0;
|
|
ic->rxquery = 0;
|
|
ic->qtx = 1;
|
|
ic->fasttimeout = 0;
|
|
|
|
/* timers */
|
|
ic->delay = DefRtt<<LogAGain;
|
|
ic->mdev = DefRtt<<LogDGain;
|
|
ic->rate = DefByteRate<<LogAGain;
|
|
ic->querytime = NOW + QueryTime;
|
|
ic->lastrecv = NOW; /* or we'll timeout right away */
|
|
ilsettimeout(ic);
|
|
}
|
|
|
|
char*
|
|
ilstart(Conv *c, int type, int fasttimeout)
|
|
{
|
|
Ilcb *ic;
|
|
Ilpriv *ipriv;
|
|
char kpname[KNAMELEN];
|
|
|
|
ipriv = c->p->priv;
|
|
|
|
if(ipriv->ackprocstarted == 0){
|
|
qlock(&ipriv->apl);
|
|
if(ipriv->ackprocstarted == 0){
|
|
jehanne_sprint(kpname, "#I%dilack", c->p->f->dev);
|
|
kproc(kpname, ilackproc, c->p);
|
|
ipriv->ackprocstarted = 1;
|
|
}
|
|
qunlock(&ipriv->apl);
|
|
}
|
|
|
|
ic = (Ilcb*)c->ptcl;
|
|
ic->conv = c;
|
|
|
|
if(ic->state != Ilclosed)
|
|
return nil;
|
|
|
|
ilcbinit(ic);
|
|
|
|
if(fasttimeout){
|
|
/* timeout if we can't connect quickly */
|
|
ic->fasttimeout = 1;
|
|
ic->timeout = NOW+Iltickms;
|
|
ic->rexmit = MaxRexmit - 4;
|
|
};
|
|
|
|
switch(type) {
|
|
default:
|
|
netlog(c->p->f, Logil, "il: start: type %d\n", type);
|
|
break;
|
|
case IL_LISTEN:
|
|
ic->state = Illistening;
|
|
iphtadd(&ipriv->ht, c);
|
|
break;
|
|
case IL_CONNECT:
|
|
ic->state = Ilsyncer;
|
|
iphtadd(&ipriv->ht, c);
|
|
ilsendctl(c, nil, Ilsync, ic->start, ic->recvd, 0);
|
|
break;
|
|
}
|
|
|
|
return nil;
|
|
}
|
|
|
|
void
|
|
ilfreeq(Ilcb *ic)
|
|
{
|
|
Block *bp, *next;
|
|
|
|
qlock(&ic->ackq);
|
|
for(bp = ic->unacked; bp; bp = next) {
|
|
next = bp->list;
|
|
freeblist(bp);
|
|
}
|
|
ic->unacked = nil;
|
|
qunlock(&ic->ackq);
|
|
|
|
qlock(&ic->outo);
|
|
for(bp = ic->outoforder; bp; bp = next) {
|
|
next = bp->list;
|
|
freeblist(bp);
|
|
}
|
|
ic->outoforder = nil;
|
|
qunlock(&ic->outo);
|
|
}
|
|
|
|
void
|
|
iladvise(Proto *il, Block *bp, char *msg)
|
|
{
|
|
Ilhdr *h;
|
|
Ilcb *ic;
|
|
uint8_t source[IPaddrlen], dest[IPaddrlen];
|
|
uint16_t psource;
|
|
Conv *s, **p;
|
|
|
|
h = (Ilhdr*)(bp->rp);
|
|
|
|
v4tov6(dest, h->dst);
|
|
v4tov6(source, h->src);
|
|
psource = nhgets(h->ilsrc);
|
|
|
|
|
|
/* Look for a connection, unfortunately the destination port is missing */
|
|
qlock(il);
|
|
for(p = il->conv; *p; p++) {
|
|
s = *p;
|
|
if(s->lport == psource)
|
|
if(ipcmp(s->laddr, source) == 0)
|
|
if(ipcmp(s->raddr, dest) == 0){
|
|
qunlock(il);
|
|
ic = (Ilcb*)s->ptcl;
|
|
switch(ic->state){
|
|
case Ilsyncer:
|
|
ilhangup(s, msg);
|
|
break;
|
|
}
|
|
freeblist(bp);
|
|
return;
|
|
}
|
|
}
|
|
qunlock(il);
|
|
freeblist(bp);
|
|
}
|
|
|
|
int
|
|
ilnextqt(Ilcb *ic)
|
|
{
|
|
int x;
|
|
|
|
qlock(&ic->ackq);
|
|
x = ic->qtx;
|
|
if(++x > Nqt)
|
|
x = 1;
|
|
ic->qtx = x;
|
|
ic->qt[x] = ic->next-1; /* highest xmitted packet */
|
|
ic->qt[0] = ic->qt[x]; /* compatibility with old implementations */
|
|
qunlock(&ic->ackq);
|
|
|
|
return x;
|
|
}
|
|
|
|
/* calculate scale constants that converts fast ticks to ms (more or less) */
|
|
static void
|
|
inittimescale(void)
|
|
{
|
|
uint64_t hz;
|
|
|
|
fastticks(&hz);
|
|
if(hz > 1000){
|
|
scalediv = hz/1000;
|
|
scalemul = 1;
|
|
} else {
|
|
scalediv = 1;
|
|
scalemul = 1000/hz;
|
|
}
|
|
}
|
|
|
|
void
|
|
ilinit(Fs *f)
|
|
{
|
|
Proto *il;
|
|
|
|
inittimescale();
|
|
|
|
il = smalloc(sizeof(Proto));
|
|
il->priv = smalloc(sizeof(Ilpriv));
|
|
il->name = "il";
|
|
il->connect = ilconnect;
|
|
il->announce = ilannounce;
|
|
il->state = ilstate;
|
|
il->create = ilcreate;
|
|
il->close = ilclose;
|
|
il->rcv = iliput;
|
|
il->ctl = nil;
|
|
il->advise = iladvise;
|
|
il->stats = ilxstats;
|
|
il->inuse = ilinuse;
|
|
il->gc = nil;
|
|
il->ipproto = IP_ILPROTO;
|
|
il->nc = scalednconv();
|
|
il->ptclsize = sizeof(Ilcb);
|
|
Fsproto(f, il);
|
|
}
|