1999/0711/ip/devip.c (diff list | history)

ip/devip.c on 1997/0327
1997/0327		#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include "../ip/ip.h" enum { Qtopdir= 1, /* top level directory */ Qtopbase, Qarp= Qtopbase,
1998/0313		Qbootp,
1997/0327		Qiproute,
1998/0306		Qiprouter,
1998/0310		Qipselftab,
1997/0327		Qlog, Qprotodir, /* directory for a protocol */ Qprotobase, Qclone= Qprotobase,
1998/0306		Qstats,
1997/0327		Qconvdir, /* directory for a conversation */ Qconvbase, Qctl= Qconvbase, Qdata, Qerr, Qlisten, Qlocal, Qremote, Qstatus,
1998/0313		Logtype= 5, Masktype= (1<<Logtype)-1, Logconv= 12, Maskconv= (1<<Logconv)-1, Shiftconv= Logtype, Logproto= 8, Maskproto= (1<<Logproto)-1, Shiftproto= Logtype + Logconv, Nfs= 16,
1997/0327		};
1998/0313		#define TYPE(x) ( (x).path & Masktype ) #define CONV(x) ( ((x).path >> Shiftconv) & Maskconv ) #define PROTO(x) ( ((x).path >> Shiftproto) & Maskproto ) #define QID(p, c, y) ( ((p)<<(Shiftproto)) | ((c)<<Shiftconv) | (y) )
1997/0327		static char network[] = "network";
1998/0313		QLock fslock; Fs *ipfs[Nfs]; /* attached fs's */ Queue *qlog;
1998/0423		extern void nullmediumlink(void); extern void pktmediumlink(void);
1997/0327		static int ip3gen(Chan *c, int i, Dir *dp) { Qid q; Conv *cv; char *p;
1998/0313		cv = ipfs[c->dev]->p[PROTO(c->qid)]->conv[CONV(c->qid)];
1997/0327		switch(i) { default: return -1; case Qctl: q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qctl), 0}; devdir(c, q, "ctl", 0, cv->owner, cv->perm, dp); return 1; case Qdata: q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qdata), 0}; devdir(c, q, "data", qlen(cv->rq), cv->owner, cv->perm, dp); return 1; case Qerr: q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qerr), 0}; devdir(c, q, "err", qlen(cv->eq), cv->owner, cv->perm, dp); return 1; case Qlisten: p = "listen"; q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qlisten), 0}; break; case Qlocal: p = "local"; q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qlocal), 0}; break; case Qremote: p = "remote"; q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qremote), 0}; break; case Qstatus: p = "status"; q = (Qid){QID(PROTO(c->qid), CONV(c->qid), Qstatus), 0}; break; }
1998/0306		devdir(c, q, p, 0, cv->owner, 0666, dp);
1997/0327		return 1; } static int ip2gen(Chan *c, int i, Dir *dp) { Qid q; switch(i) { case Qclone: q = (Qid){QID(PROTO(c->qid), 0, Qclone), 0};
1998/0306		devdir(c, q, "clone", 0, network, 0666, dp);
1997/0327		return 1;
1998/0306		case Qstats: q = (Qid){QID(PROTO(c->qid), 0, Qstats), 0}; devdir(c, q, "stats", 0, network, 0444, dp); return 1;
1997/0327		} return -1; } static int ip1gen(Chan *c, int i, Dir *dp) { Qid q; char *p;
1998/0310		int prot;
1997/0327
1998/0310		prot = 0666;
1997/0327		switch(i) { default: return -1; case Qarp: p = "arp"; q = (Qid){QID(0, 0, Qarp), 0}; break;
1998/0313		case Qbootp: p = "bootp"; q = (Qid){QID(0, 0, Qbootp), 0}; break;
1997/0327		case Qiproute: p = "iproute"; q = (Qid){QID(0, 0, Qiproute), 0}; break;
1998/0310		case Qipselftab: p = "ipselftab"; prot = 0444; q = (Qid){QID(0, 0, Qipselftab), 0}; break;
1998/0306		case Qiprouter: p = "iprouter"; q = (Qid){QID(0, 0, Qiprouter), 0}; break;
1997/0327		case Qlog: p = "log"; q = (Qid){QID(0, 0, Qlog), 0}; break; }
1998/0310		devdir(c, q, p, 0, network, prot, dp);
1997/0327		return 1; } static int ipgen(Chan *c, Dirtab*, int, int s, Dir *dp) { Qid q; Conv *cv; char name[16];
1998/0313		Fs *f;
1997/0327
1998/0313		f = ipfs[c->dev];
1997/0327		switch(TYPE(c->qid)) { case Qtopdir:
1998/0313		if(s < f->np) { if(f->p[s]->connect == nil)
1997/0423		return 0; /* protocol with no user interface */
1997/0327		q = (Qid){QID(s, 0, Qprotodir)|CHDIR, 0};
1998/0313		devdir(c, q, f->p[s]->name, 0, network, CHDIR|0555, dp);
1997/0327		return 1; }
1998/0313		s -= f->np;
1997/0327		return ip1gen(c, s+Qtopbase, dp); case Qarp:
1998/0313		case Qbootp:
1997/0327		case Qlog: case Qiproute:
1998/0306		case Qiprouter:
1998/0310		case Qipselftab:
1997/0327		return ip1gen(c, TYPE(c->qid), dp); case Qprotodir:
1998/0313		if(s < f->p[PROTO(c->qid)]->ac) { cv = f->p[PROTO(c->qid)]->conv[s];
1997/0327		sprint(name, "%d", s); q = (Qid){QID(PROTO(c->qid), s, Qconvdir)|CHDIR, 0}; devdir(c, q, name, 0, cv->owner, CHDIR|0555, dp); return 1; }
1998/0313		s -= f->p[PROTO(c->qid)]->ac;
1997/0327		return ip2gen(c, s+Qprotobase, dp); case Qclone:
1998/0306		case Qstats:
1997/0327		return ip2gen(c, TYPE(c->qid), dp); case Qconvdir: return ip3gen(c, s+Qconvbase, dp); case Qctl: case Qdata: case Qerr: case Qlisten: case Qlocal: case Qremote: case Qstatus: return ip3gen(c, TYPE(c->qid), dp); } return -1; } static void ipreset(void) {
1998/0423		nullmediumlink(); pktmediumlink();
1997/0327		} static void ipinit(void) { fmtinstall('i', eipconv); fmtinstall('I', eipconv); fmtinstall('E', eipconv);
1998/0306		fmtinstall('V', eipconv); fmtinstall('M', eipconv);
1997/0327		}
1998/0313		static Fs* ipgetfs(int dev) { extern void (*ipprotoinit[])(Fs*); Fs *f; int i; if(dev >= Nfs) return nil; qlock(&fslock); if(ipfs[dev] == nil){ f = smalloc(sizeof(Fs)); ip_init(f); arpinit(f); netloginit(f); for(i = 0; ipprotoinit[i]; i++) ipprotoinit[i](f);
1998/0924		f->dev = dev;
1998/0313		ipfs[dev] = f; } qunlock(&fslock); return ipfs[dev]; }
1997/0327		static Chan* ipattach(char* spec) { Chan *c;
1998/0313		int dev;
1997/0327
1998/0313		dev = atoi(spec); if(dev >= 16) error("bad specification"); ipgetfs(dev);
1997/0327		c = devattach('I', spec); c->qid = (Qid){QID(0, 0, Qtopdir)|CHDIR, 0};
1998/0313		c->dev = dev;
1997/0327		return c; } static Chan* ipclone(Chan* c, Chan* nc) { return devclone(c, nc); } static int ipwalk(Chan* c, char* name) {
1998/0306		if(strcmp(name, "..") != 0) return devwalk(c, name, nil, 0, ipgen);
1997/0327
1998/0306		switch(TYPE(c->qid)){ case Qtopdir: case Qprotodir: c->qid = (Qid){QID(0, 0, Qtopdir)|CHDIR, 0}; break; case Qconvdir: c->qid = (Qid){QID(PROTO(c->qid), 0, Qprotodir)|CHDIR, 0}; break; default: panic("ipwalk %lux", c->qid.path); } return 1;
1997/0327		} static void ipstat(Chan* c, char* db) { devstat(c, db, nil, 0, ipgen); } static int incoming(void* arg) { Conv *conv; conv = arg; return conv->incall != nil; } static int m2p[] = { [OREAD] 4, [OWRITE] 2, [ORDWR] 6 }; static Chan* ipopen(Chan* c, int omode) { Conv *cv, *nc; Proto *p; int perm;
1998/0313		Fs *f;
1997/0327		omode &= 3; perm = m2p[omode];
1998/0313		f = ipfs[c->dev];
1997/0327		switch(TYPE(c->qid)) { default: break; case Qlog:
1998/0313		netlogopen(f);
1997/0327		break;
1998/0306		case Qiprouter:
1998/0313		iprouteropen(f);
1998/0306		break; case Qiproute: memmove(c->tag, "none", sizeof(c->tag)); break;
1997/0327		case Qtopdir: case Qprotodir: case Qconvdir: case Qstatus: case Qremote: case Qlocal:
1998/0306		case Qstats:
1998/0313		case Qbootp:
1998/0310		case Qipselftab:
1997/0327		if(omode != OREAD) error(Eperm); break; case Qclone:
1998/0313		p = f->p[PROTO(c->qid)];
1999/0302		qlock(p); if(waserror()){ qunlock(p); nexterror(); }
1998/0313		cv = Fsprotoclone(p, commonuser());
1999/0302		qunlock(p); poperror();
1997/0327		if(cv == nil) { error(Enodev); break; } c->qid = (Qid){QID(p->x, cv->x, Qctl), 0}; break; case Qdata: case Qctl: case Qerr:
1998/0313		p = f->p[PROTO(c->qid)];
1998/0306		qlock(p);
1997/0327		cv = p->conv[CONV(c->qid)];
1999/0302		qlock(cv);
1997/0327		if(waserror()) {
1999/0302		qunlock(cv);
1998/0306		qunlock(p);
1997/0327		nexterror(); } if((perm & (cv->perm>>6)) != perm) {
1998/0313		if(strcmp(commonuser(), cv->owner) != 0)
1997/0327		error(Eperm); if((perm & cv->perm) != perm) error(Eperm); } cv->inuse++; if(cv->inuse == 1){
1998/0313		memmove(cv->owner, commonuser(), NAMELEN);
1997/0327		cv->perm = 0660; }
1999/0302		qunlock(cv);
1998/0306		qunlock(p);
1997/0327		poperror(); break; case Qlisten:
1998/0313		cv = f->p[PROTO(c->qid)]->conv[CONV(c->qid)];
1997/0327		if(cv->state != Announced) error("not announced"); nc = nil; while(nc == nil) {
1998/1127		/* give up if we got a hangup */ if(qisclosed(cv->rq)) error("listen hungup");
1997/0327		qlock(&cv->listenq); if(waserror()) { qunlock(&cv->listenq); nexterror(); }
1998/1127		/* wait for a connect */
1997/0327		sleep(&cv->listenr, incoming, cv);
1999/0302		qlock(cv);
1997/0327		nc = cv->incall; if(nc != nil){ cv->incall = nc->next; c->qid = (Qid){QID(PROTO(c->qid), nc->x, Qctl), 0};
1998/0313		memmove(cv->owner, commonuser(), NAMELEN);
1997/0327		}
1999/0302		qunlock(cv);
1997/0327		qunlock(&cv->listenq); poperror(); } break; } c->mode = openmode(omode); c->flag |= COPEN; c->offset = 0; return c; } static void ipcreate(Chan*, char*, int, ulong) { error(Eperm); } static void ipremove(Chan*) { error(Eperm); } static void ipwstat(Chan*, char*) { error(Eperm); } static void closeconv(Conv *cv) { Conv *nc;
1998/0306		Ipmulti *mp;
1997/0327
1999/0302		qlock(cv);
1998/0306
1997/0327		if(--cv->inuse > 0) {
1999/0302		qunlock(cv);
1997/0327		return; } /* close all incoming calls since no listen will ever happen */ for(nc = cv->incall; nc; nc = cv->incall){ cv->incall = nc->next; closeconv(nc); }
1998/0321		cv->incall = nil;
1997/0327		strcpy(cv->owner, network); cv->perm = 0660;
1998/0306		while((mp = cv->multi) != nil) ipifcremmulti(cv, mp->ma, mp->ia);
1997/0327		/* The close routine will unlock the conv */ cv->p->close(cv); } static void ipclose(Chan* c) {
1998/0313		Fs *f; f = ipfs[c->dev];
1997/0327		switch(TYPE(c->qid)) { default: break;
1998/0306		case Qlog:
1997/0531		if(c->flag & COPEN)
1998/0313		netlogclose(f);
1997/0423		break;
1998/0306		case Qiprouter: if(c->flag & COPEN)
1998/0313		iprouterclose(f);
1997/0327		break; case Qdata: case Qctl: case Qerr: if(c->flag & COPEN)
1998/0313		closeconv(f->p[PROTO(c->qid)]->conv[CONV(c->qid)]);
1997/0327		} }
1998/0306		enum {
1998/0717		Statelen= 32*1024,
1998/0306		};
1997/0327		static long
1998/0319		ipread(Chan *ch, void *a, long n, vlong off)
1997/0327		{ Conv *c; Proto *x;
1998/0306		char *buf, *p;
1998/0710		long rv;
1998/0313		Fs *f;
1998/0319		ulong offset = off;
1997/0327
1998/0313		f = ipfs[ch->dev];
1997/0327		p = a; switch(TYPE(ch->qid)) { default: error(Eperm); case Qtopdir: case Qprotodir: case Qconvdir: return devdirread(ch, a, n, 0, 0, ipgen); case Qarp:
1998/0313		return arpread(f->arp, a, offset, n); case Qbootp: return bootpread(a, offset, n);
1997/0327		case Qiproute:
1998/0313		return routeread(f, a, offset, n);
1998/0310		case Qipselftab:
1998/0313		return ipselftabread(f, a, offset, n);
1997/0327		case Qlog:
1998/0313		return netlogread(f, a, offset, n);
1997/0327		case Qctl:
1998/0306		buf = smalloc(16);
1998/0825		sprint(buf, "%lud", CONV(ch->qid));
1998/0306		rv = readstr(offset, p, n, buf); free(buf); return rv;
1997/0327		case Qremote:
1998/0306		buf = smalloc(Statelen);
1999/0316		x = f->p[PROTO(ch->qid)]; c = x->conv[CONV(ch->qid)]; if(x->remote == nil) { sprint(buf, "%I!%d\n", c->raddr, c->rport); } else { (*x->remote)(c, buf, Statelen-2); }
1998/0306		rv = readstr(offset, p, n, buf); free(buf); return rv;
1997/0327		case Qlocal:
1998/0306		buf = smalloc(Statelen);
1998/0313		x = f->p[PROTO(ch->qid)];
1998/0306		c = x->conv[CONV(ch->qid)]; if(x->local == nil) { sprint(buf, "%I!%d\n", c->laddr, c->lport); } else { (*x->local)(c, buf, Statelen-2); } rv = readstr(offset, p, n, buf); free(buf); return rv;
1997/0327		case Qstatus:
1998/0306		buf = smalloc(Statelen);
1998/0313		x = f->p[PROTO(ch->qid)];
1997/0327		c = x->conv[CONV(ch->qid)];
1998/0709		(*x->state)(c, buf, Statelen-2);
1998/0306		rv = readstr(offset, p, n, buf); free(buf); return rv;
1997/0327		case Qdata:
1998/0313		c = f->p[PROTO(ch->qid)]->conv[CONV(ch->qid)];
1997/1105		return qread(c->rq, a, n);
1997/0327		case Qerr:
1998/0313		c = f->p[PROTO(ch->qid)]->conv[CONV(ch->qid)];
1997/0327		return qread(c->eq, a, n);
1998/0306		case Qstats:
1998/0313		x = f->p[PROTO(ch->qid)];
1998/0306		if(x->stats == nil) error("stats not implemented"); buf = smalloc(Statelen);
1998/0313		(*x->stats)(x, buf, Statelen);
1998/0306		rv = readstr(offset, p, n, buf); free(buf); return rv;
1997/0327		} } static Block* ipbread(Chan* c, long n, ulong offset) { return devbread(c, n, offset); }
1998/0306		/* * set local address to be that of the ifc closest to remote address */
1997/0327		static void setladdr(Conv* c) {
1998/0313		findlocalip(c->p->f, c->laddr, c->raddr);
1997/0327		}
1998/0306		/* * pick a local port and set it */
1997/0327		static void setlport(Conv* c) { Proto *p; ushort *pp; int x, found; p = c->p; if(c->restricted) pp = &p->nextrport; else pp = &p->nextport;
1998/0306		qlock(p);
1997/0327		for(;;(*pp)++){
1997/0508		/* * Fsproto initialises p->nextport to 0 and the restricted * ports (p->nextrport) to 600. * Restricted ports must lie between 600 and 1024. * For the initial condition or if the unrestricted port number
1997/0811		* has wrapped round, select a random port between 5000 and 1<<15
1997/0508		* to start at. */ if(c->restricted){ if(*pp >= 1024)
1997/0327		*pp = 600; }
1997/0508		else while(*pp < 5000)
1997/0811		*pp = nrand(1<<15);
1997/0508
1997/0327		found = 0; for(x = 0; x < p->nc; x++){ if(p->conv[x] == nil) break; if(p->conv[x]->lport == *pp){ found = 1; break; } } if(!found) break; } c->lport = (*pp)++;
1998/0306		qunlock(p);
1997/0327		}
1998/0306		/* * set a local address and port from a string of the form * address!port * if address is missing and not announcing, pick one * if address is missing and announcing, leave address as zero (i.e. matches anything) * if port is 0, pick a free one * if port is '*', leave port as zero (i.e. matches anything) */
1997/0327		static void
1998/0306		setladdrport(Conv* c, char* str, int announcing)
1997/0327		{
1997/0423		char *p;
1997/0327
1997/1128		/* * ignore restricted part if it exists. it's * meaningless on local ports. */
1997/0327		p = strchr(str, '!');
1997/1128		if(p == nil || strcmp(p, "!r") == 0) {
1997/0327		p = str;
1998/0306		memset(c->laddr, 0, sizeof(c->laddr)); if(!announcing)
1997/1030		setladdr(c);
1998/0306		} else {
1997/0327		*p++ = 0;
1998/0306		parseip(c->laddr, str);
1997/0327		}
1998/0306		c->lport = 0; if(*p != '*'){
1997/0327		c->lport = atoi(p); if(c->lport == 0) setlport(c); } } static char* setraddrport(Conv* c, char* str) {
1997/0423		char *p;
1997/0327		p = strchr(str, '!'); if(p == nil) return "malformed address"; *p++ = 0;
1998/0306		parseip(c->raddr, str);
1997/0327		c->rport = atoi(p); p = strchr(p, '!'); if(p){ if(strcmp(p, "!r") == 0) c->restricted = 1; } return nil; }
1998/0306		/* * called by protocol connect routine to set addresses */ char* Fsstdconnect(Conv *c, char *argv[], int argc) { char *p; switch(argc) { default: return "bad args to connect"; case 2: p = setraddrport(c, argv[1]); if(p != nil) return p; setladdr(c); setlport(c); break; case 3: p = setraddrport(c, argv[1]); if(p != nil) return p; setladdrport(c, argv[2], 0); break; } return nil; } /* * initiate connection and sleep till its set up */
1997/0327		static int connected(void* a) { return ((Conv*)a)->state == Connected; }
1998/0306		static void connectctlmsg(Proto *x, Conv *c, Cmdbuf *cb) { char *p;
1997/0327
1998/0306		c->state = Connecting; c->cerr[0] = '\0'; if(x->connect == nil) error("connect not supported"); p = x->connect(c, cb->f, cb->nf); if(p != nil) error(p); sleep(&c->cr, connected, c); if(c->cerr[0] != '\0') error(c->cerr); } /* * called by protocol announce routine to set addresses */ char* Fsstdannounce(Conv* c, char* argv[], int argc) { switch(argc){ default: return "bad args to announce"; case 2: setladdrport(c, argv[1], 1); break; } return nil; } /* * initiate announcement and sleep till its set up */
1997/0327		static int announced(void* a) { return ((Conv*)a)->state == Announced; }
1998/0306		static void announcectlmsg(Proto *x, Conv *c, Cmdbuf *cb) { char *p;
1997/0327
1998/0306		c->state = Announcing; c->cerr[0] = '\0'; if(x->announce == nil) error("announce not supported"); p = x->announce(c, cb->f, cb->nf); if(p != nil) error(p); sleep(&c->cr, announced, c); if(c->cerr[0] != '\0') error(c->cerr); } /* * called by protocol bide routine to set addresses */ char* Fsstdbind(Conv* c, char* argv[], int argc) { switch(argc){ default: return "bad args to bind"; case 2: setladdrport(c, argv[1], 0); break; } return nil; } static void bindctlmsg(Proto *x, Conv *c, Cmdbuf *cb) { char *p; if(x->bind == nil) p = Fsstdbind(c, cb->f, cb->nf); else p = x->bind(c, cb->f, cb->nf); if(p != nil) error(p); } static void ttlctlmsg(Conv *c, Cmdbuf *cb) { if(cb->nf < 2) c->ttl = MAXTTL; else c->ttl = atoi(cb->f[1]); }
1997/0327		static long
1999/0320		ipwrite(Chan* ch, void *v, long n, vlong)
1997/0327		{ Conv *c; Proto *x;
1998/0306		char *p; Cmdbuf *cb;
1998/0502		uchar ia[IPaddrlen], ma[IPaddrlen];
1998/0313		Fs *f;
1999/0320		char *a;
1997/0327
1999/0320		a = v;
1998/0313		f = ipfs[ch->dev];
1997/0327		switch(TYPE(ch->qid)){ default: error(Eperm);
1998/0306		case Qdata:
1998/0313		x = f->p[PROTO(ch->qid)];
1998/0306		c = x->conv[CONV(ch->qid)]; if(c->wq == nil) error(Eperm); qwrite(c->wq, a, n); x->kick(c, n); break;
1997/0327		case Qarp:
1998/0630		return arpwrite(f, a, n);
1997/0327		case Qiproute:
1998/0313		return routewrite(f, ch, a, n);
1997/0327		case Qlog:
1998/0313		p = netlogctl(f, a, n);
1997/0327		if(p != nil) error(p); return n; case Qctl:
1998/0313		x = f->p[PROTO(ch->qid)];
1997/0327		c = x->conv[CONV(ch->qid)];
1998/0306		cb = parsecmd(a, n); if(canqlock(&c->car) == 0){ free(cb); error("connect/announce in progress");
1997/0327		}
1998/0306		if(waserror()) {
1997/0327		qunlock(&c->car);
1998/0306		free(cb); nexterror();
1997/0327		}
1999/0316		if(cb->nf < 1) error("short control request");
1998/0306		if(strcmp(cb->f[0], "connect") == 0) connectctlmsg(x, c, cb); else if(strcmp(cb->f[0], "announce") == 0) announcectlmsg(x, c, cb); else if(strcmp(cb->f[0], "bind") == 0) bindctlmsg(x, c, cb); else if(strcmp(cb->f[0], "ttl") == 0) ttlctlmsg(c, cb); else if(strcmp(cb->f[0], "addmulti") == 0){ if(cb->nf < 2) error("addmulti needs interface address");
1998/0502		if(cb->nf == 2){ if(!ipismulticast(c->raddr)) error("addmulti for a non multicast address"); parseip(ia, cb->f[1]); ipifcaddmulti(c, c->raddr, ia); } else { parseip(ma, cb->f[2]); if(!ipismulticast(ma)) error("addmulti for a non multicast address"); parseip(ia, cb->f[1]); ipifcaddmulti(c, ma, ia); }
1998/0306		} else if(strcmp(cb->f[0], "remmulti") == 0){ if(cb->nf < 2) error("remmulti needs interface address"); if(!ipismulticast(c->raddr)) error("remmulti for a non multicast address"); parseip(ia, cb->f[1]); ipifcremmulti(c, c->raddr, ia); } else if(x->ctl != nil) { p = x->ctl(c, cb->f, cb->nf);
1997/0327		if(p != nil) error(p);
1998/0306		} else error("unknown control request"); qunlock(&c->car); free(cb); poperror();
1997/0327		} return n; } static long ipbwrite(Chan* c, Block* bp, ulong offset) { return devbwrite(c, bp, offset); } Dev ipdevtab = {
1997/0408		'I', "ip",
1997/0327		ipreset, ipinit, ipattach, ipclone, ipwalk, ipstat, ipopen, ipcreate, ipclose, ipread, ipbread, ipwrite, ipbwrite, ipremove, ipwstat, }; int
1998/0313		Fsproto(Fs *f, Proto *p)
1997/0327		{
1998/0313		if(f->np >= Maxproto)
1997/0327		return -1;
1998/0313		p->f = f;
1997/0327		if(p->ipproto > 0){
1998/0313		if(f->t2p[p->ipproto] != nil)
1997/0327		return -1;
1998/0313		f->t2p[p->ipproto] = p;
1997/0327		}
1998/0313		p->qid.path = CHDIR|QID(f->np, 0, Qprotodir);
1997/0327		p->conv = malloc(sizeof(Conv*)*(p->nc+1)); if(p->conv == nil) panic("Fsproto");
1998/0313		p->x = f->np;
1997/0327		p->nextport = 0; p->nextrport = 600;
1998/0313		f->p[f->np++] = p;
1997/0327		return 0; } /* * return true if this protocol is * built in */ int
1998/0313		Fsbuiltinproto(Fs* f, uchar proto)
1997/0327		{
1998/0313		return f->t2p[proto] != nil;
1997/0327		}
1999/0302		/* * called with protocol locked */
1997/0327		Conv* Fsprotoclone(Proto *p, char *user) { Conv *c, **pp, **ep; c = nil; ep = &p->conv[p->nc]; for(pp = p->conv; pp < ep; pp++) { c = *pp; if(c == nil){ c = malloc(sizeof(Conv)); if(c == nil) error(Enomem);
1999/0302		qlock(c);
1997/0327		c->p = p; c->x = pp - p->conv;
1999/0711		if(p->ptclsize != 0){ c->ptcl = malloc(p->ptclsize); if(c->ptcl == nil) { free(c); error(Enomem); }
1997/0327		} *pp = c; p->ac++; c->eq = qopen(1024, 1, 0, 0); (*p->create)(c); break; }
1999/0302		if(canqlock(c)){
1998/0306		/* * make sure both processes and protocol * are done with this Conv */ if(c->inuse == 0 && (p->inuse == nil || (*p->inuse)(c) == 0))
1997/0327		break;
1999/0302		qunlock(c);
1997/0327		} } if(pp >= ep) { return nil; } c->inuse = 1; strcpy(c->owner, user); c->perm = 0660; c->state = 0;
1998/0306		ipmove(c->laddr, IPnoaddr); ipmove(c->raddr, IPnoaddr);
1997/0327		c->lport = 0; c->rport = 0; c->restricted = 0; c->ttl = MAXTTL; qreopen(c->rq); qreopen(c->wq); qreopen(c->eq);
1999/0302		qunlock(c);
1997/0327		return c; } int
1998/0313		Fsconnected(Conv* c, char* msg)
1997/0327		{ if(msg != nil && *msg != '\0') strncpy(c->cerr, msg, ERRLEN-1); switch(c->state){ case Announcing: c->state = Announced; break; case Connecting: c->state = Connected; break; } wakeup(&c->cr); return 0; } Proto*
1998/0313		Fsrcvpcol(Fs* f, uchar proto)
1997/0327		{
1998/0327		if(f->ipmux)
1998/0324		return f->ipmux; else return f->t2p[proto];
1997/0327		}
1998/0509		Proto* Fsrcvpcolx(Fs *f, uchar proto) { return f->t2p[proto]; }
1999/0302		/* * called with protocol locked */
1997/0327		Conv*
1998/0313		Fsnewcall(Conv *c, uchar *raddr, ushort rport, uchar *laddr, ushort lport)
1997/0327		{ Conv *nc; Conv **l; int i;
1999/0302		qlock(c);
1997/0327		i = 0; for(l = &c->incall; *l; l = &(*l)->next) i++; if(i >= Maxincall) {
1999/0302		qunlock(c);
1997/0327		return nil; } /* find a free conversation */ nc = Fsprotoclone(c->p, network); if(nc == nil) {
1999/0302		qunlock(c);
1997/0327		return nil; }
1998/0306		ipmove(nc->raddr, raddr);
1997/0327		nc->rport = rport;
1998/0306		ipmove(nc->laddr, laddr);
1997/0327		nc->lport = lport; nc->next = nil; *l = nc;
1999/0302		qunlock(c);
1997/0327		wakeup(&c->listenr); return nc; }