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- #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,
- Qbootp,
- Qndb,
- Qiproute,
- Qipselftab,
- Qlog,
- Qprotodir, /* directory for a protocol */
- Qprotobase,
- Qclone= Qprotobase,
- Qstats,
- Qconvdir, /* directory for a conversation */
- Qconvbase,
- Qctl= Qconvbase,
- Qdata,
- Qerr,
- Qlisten,
- Qlocal,
- Qremote,
- Qstatus,
- Qsnoop,
- Logtype= 5,
- Masktype= (1<<Logtype)-1,
- Logconv= 12,
- Maskconv= (1<<Logconv)-1,
- Shiftconv= Logtype,
- Logproto= 8,
- Maskproto= (1<<Logproto)-1,
- Shiftproto= Logtype + Logconv,
- Nfs= 128,
- };
- #define TYPE(x) ( ((ulong)(x).path) & Masktype )
- #define CONV(x) ( (((ulong)(x).path) >> Shiftconv) & Maskconv )
- #define PROTO(x) ( (((ulong)(x).path) >> Shiftproto) & Maskproto )
- #define QID(p, c, y) ( ((p)<<(Shiftproto)) | ((c)<<Shiftconv) | (y) )
- static char network[] = "network";
- QLock fslock;
- Fs *ipfs[Nfs]; /* attached fs's */
- Queue *qlog;
- extern void nullmediumlink(void);
- extern void pktmediumlink(void);
- long ndbwrite(Fs *f, char *a, ulong off, int n);
- static int
- ip3gen(Chan *c, int i, Dir *dp)
- {
- Qid q;
- Conv *cv;
- char *p;
- cv = ipfs[c->dev]->p[PROTO(c->qid)]->conv[CONV(c->qid)];
- if(cv->owner == nil)
- kstrdup(&cv->owner, eve);
- mkqid(&q, QID(PROTO(c->qid), CONV(c->qid), i), 0, QTFILE);
- switch(i) {
- default:
- return -1;
- case Qctl:
- devdir(c, q, "ctl", 0, cv->owner, cv->perm, dp);
- return 1;
- case Qdata:
- devdir(c, q, "data", qlen(cv->rq), cv->owner, cv->perm, dp);
- return 1;
- case Qerr:
- devdir(c, q, "err", qlen(cv->eq), cv->owner, cv->perm, dp);
- return 1;
- case Qlisten:
- devdir(c, q, "listen", 0, cv->owner, cv->perm, dp);
- return 1;
- case Qlocal:
- p = "local";
- break;
- case Qremote:
- p = "remote";
- break;
- case Qsnoop:
- if(strcmp(cv->p->name, "ipifc") != 0)
- return -1;
- devdir(c, q, "snoop", qlen(cv->sq), cv->owner, 0400, dp);
- return 1;
- case Qstatus:
- p = "status";
- break;
- }
- devdir(c, q, p, 0, cv->owner, 0444, dp);
- return 1;
- }
- static int
- ip2gen(Chan *c, int i, Dir *dp)
- {
- Qid q;
- switch(i) {
- case Qclone:
- mkqid(&q, QID(PROTO(c->qid), 0, Qclone), 0, QTFILE);
- devdir(c, q, "clone", 0, network, 0666, dp);
- return 1;
- case Qstats:
- mkqid(&q, QID(PROTO(c->qid), 0, Qstats), 0, QTFILE);
- devdir(c, q, "stats", 0, network, 0444, dp);
- return 1;
- }
- return -1;
- }
- static int
- ip1gen(Chan *c, int i, Dir *dp)
- {
- Qid q;
- char *p;
- int prot;
- int len = 0;
- Fs *f;
- extern ulong kerndate;
- f = ipfs[c->dev];
- prot = 0666;
- mkqid(&q, QID(0, 0, i), 0, QTFILE);
- switch(i) {
- default:
- return -1;
- case Qarp:
- p = "arp";
- break;
- case Qbootp:
- p = "bootp";
- break;
- case Qndb:
- p = "ndb";
- len = strlen(f->ndb);
- q.vers = f->ndbvers;
- break;
- case Qiproute:
- p = "iproute";
- break;
- case Qipselftab:
- p = "ipselftab";
- prot = 0444;
- break;
- case Qlog:
- p = "log";
- break;
- }
- devdir(c, q, p, len, network, prot, dp);
- if(i == Qndb && f->ndbmtime > kerndate)
- dp->mtime = f->ndbmtime;
- return 1;
- }
- static int
- ipgen(Chan *c, char*, Dirtab*, int, int s, Dir *dp)
- {
- Qid q;
- Conv *cv;
- Fs *f;
- f = ipfs[c->dev];
- switch(TYPE(c->qid)) {
- case Qtopdir:
- if(s == DEVDOTDOT){
- mkqid(&q, QID(0, 0, Qtopdir), 0, QTDIR);
- sprint(up->genbuf, "#I%lud", c->dev);
- devdir(c, q, up->genbuf, 0, network, 0555, dp);
- return 1;
- }
- if(s < f->np) {
- if(f->p[s]->connect == nil)
- return 0; /* protocol with no user interface */
- mkqid(&q, QID(s, 0, Qprotodir), 0, QTDIR);
- devdir(c, q, f->p[s]->name, 0, network, 0555, dp);
- return 1;
- }
- s -= f->np;
- return ip1gen(c, s+Qtopbase, dp);
- case Qarp:
- case Qbootp:
- case Qndb:
- case Qlog:
- case Qiproute:
- case Qipselftab:
- return ip1gen(c, TYPE(c->qid), dp);
- case Qprotodir:
- if(s == DEVDOTDOT){
- mkqid(&q, QID(0, 0, Qtopdir), 0, QTDIR);
- sprint(up->genbuf, "#I%lud", c->dev);
- devdir(c, q, up->genbuf, 0, network, 0555, dp);
- return 1;
- }
- if(s < f->p[PROTO(c->qid)]->ac) {
- cv = f->p[PROTO(c->qid)]->conv[s];
- sprint(up->genbuf, "%d", s);
- mkqid(&q, QID(PROTO(c->qid), s, Qconvdir), 0, QTDIR);
- devdir(c, q, up->genbuf, 0, cv->owner, 0555, dp);
- return 1;
- }
- s -= f->p[PROTO(c->qid)]->ac;
- return ip2gen(c, s+Qprotobase, dp);
- case Qclone:
- case Qstats:
- return ip2gen(c, TYPE(c->qid), dp);
- case Qconvdir:
- if(s == DEVDOTDOT){
- s = PROTO(c->qid);
- mkqid(&q, QID(s, 0, Qprotodir), 0, QTDIR);
- devdir(c, q, f->p[s]->name, 0, network, 0555, dp);
- return 1;
- }
- return ip3gen(c, s+Qconvbase, dp);
- case Qctl:
- case Qdata:
- case Qerr:
- case Qlisten:
- case Qlocal:
- case Qremote:
- case Qstatus:
- case Qsnoop:
- return ip3gen(c, TYPE(c->qid), dp);
- }
- return -1;
- }
- static void
- ipreset(void)
- {
- nullmediumlink();
- pktmediumlink();
- fmtinstall('i', eipfmt);
- fmtinstall('I', eipfmt);
- fmtinstall('E', eipfmt);
- fmtinstall('V', eipfmt);
- fmtinstall('M', eipfmt);
- }
- 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);
- f->dev = dev;
- ipfs[dev] = f;
- }
- qunlock(&fslock);
- return ipfs[dev];
- }
- IPaux*
- newipaux(char *owner, char *tag)
- {
- IPaux *a;
- int n;
- a = smalloc(sizeof(*a));
- kstrdup(&a->owner, owner);
- memset(a->tag, ' ', sizeof(a->tag));
- n = strlen(tag);
- if(n > sizeof(a->tag))
- n = sizeof(a->tag);
- memmove(a->tag, tag, n);
- return a;
- }
- #define ATTACHER(c) (((IPaux*)((c)->aux))->owner)
- static Chan*
- ipattach(char* spec)
- {
- Chan *c;
- int dev;
- dev = atoi(spec);
- if(dev >= Nfs)
- error("bad specification");
- ipgetfs(dev);
- c = devattach('I', spec);
- mkqid(&c->qid, QID(0, 0, Qtopdir), 0, QTDIR);
- c->dev = dev;
- c->aux = newipaux(commonuser(), "none");
- return c;
- }
- static Walkqid*
- ipwalk(Chan* c, Chan *nc, char **name, int nname)
- {
- IPaux *a = c->aux;
- Walkqid* w;
- w = devwalk(c, nc, name, nname, nil, 0, ipgen);
- if(w != nil && w->clone != nil)
- w->clone->aux = newipaux(a->owner, a->tag);
- return w;
- }
- static int
- ipstat(Chan* c, uchar* db, int n)
- {
- return devstat(c, db, n, 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;
- Fs *f;
- perm = m2p[omode&3];
- f = ipfs[c->dev];
- switch(TYPE(c->qid)) {
- default:
- break;
- case Qndb:
- if(omode & (OWRITE|OTRUNC) && !iseve())
- error(Eperm);
- if((omode & (OWRITE|OTRUNC)) == (OWRITE|OTRUNC))
- f->ndb[0] = 0;
- break;
- case Qlog:
- netlogopen(f);
- break;
- case Qiproute:
- break;
- case Qtopdir:
- case Qprotodir:
- case Qconvdir:
- case Qstatus:
- case Qremote:
- case Qlocal:
- case Qstats:
- case Qbootp:
- case Qipselftab:
- if(omode != OREAD)
- error(Eperm);
- break;
- case Qsnoop:
- if(omode != OREAD)
- error(Eperm);
- p = f->p[PROTO(c->qid)];
- cv = p->conv[CONV(c->qid)];
- if(strcmp(ATTACHER(c), cv->owner) != 0 && !iseve())
- error(Eperm);
- incref(&cv->snoopers);
- break;
- case Qclone:
- p = f->p[PROTO(c->qid)];
- qlock(p);
- if(waserror()){
- qunlock(p);
- nexterror();
- }
- cv = Fsprotoclone(p, ATTACHER(c));
- qunlock(p);
- poperror();
- if(cv == nil) {
- error(Enodev);
- break;
- }
- mkqid(&c->qid, QID(p->x, cv->x, Qctl), 0, QTFILE);
- break;
- case Qdata:
- case Qctl:
- case Qerr:
- p = f->p[PROTO(c->qid)];
- qlock(p);
- cv = p->conv[CONV(c->qid)];
- qlock(cv);
- if(waserror()) {
- qunlock(cv);
- qunlock(p);
- nexterror();
- }
- if((perm & (cv->perm>>6)) != perm) {
- if(strcmp(ATTACHER(c), cv->owner) != 0)
- error(Eperm);
- if((perm & cv->perm) != perm)
- error(Eperm);
- }
- cv->inuse++;
- if(cv->inuse == 1){
- kstrdup(&cv->owner, ATTACHER(c));
- cv->perm = 0660;
- }
- qunlock(cv);
- qunlock(p);
- poperror();
- break;
- case Qlisten:
- cv = f->p[PROTO(c->qid)]->conv[CONV(c->qid)];
- if((perm & (cv->perm>>6)) != perm) {
- if(strcmp(ATTACHER(c), cv->owner) != 0)
- error(Eperm);
- if((perm & cv->perm) != perm)
- error(Eperm);
- }
- if(cv->state != Announced)
- error("not announced");
- if(waserror()){
- closeconv(cv);
- nexterror();
- }
- qlock(cv);
- cv->inuse++;
- qunlock(cv);
- nc = nil;
- while(nc == nil) {
- /* give up if we got a hangup */
- if(qisclosed(cv->rq))
- error("listen hungup");
- qlock(&cv->listenq);
- if(waserror()) {
- qunlock(&cv->listenq);
- nexterror();
- }
- /* wait for a connect */
- sleep(&cv->listenr, incoming, cv);
- qlock(cv);
- nc = cv->incall;
- if(nc != nil){
- cv->incall = nc->next;
- mkqid(&c->qid, QID(PROTO(c->qid), nc->x, Qctl), 0, QTFILE);
- kstrdup(&cv->owner, ATTACHER(c));
- }
- qunlock(cv);
- qunlock(&cv->listenq);
- poperror();
- }
- closeconv(cv);
- 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 int
- ipwstat(Chan *c, uchar *dp, int n)
- {
- Dir d;
- Conv *cv;
- Fs *f;
- Proto *p;
- f = ipfs[c->dev];
- switch(TYPE(c->qid)) {
- default:
- error(Eperm);
- break;
- case Qctl:
- case Qdata:
- break;
- }
- n = convM2D(dp, n, &d, nil);
- if(n > 0){
- p = f->p[PROTO(c->qid)];
- cv = p->conv[CONV(c->qid)];
- if(!iseve() && strcmp(ATTACHER(c), cv->owner) != 0)
- error(Eperm);
- if(d.uid[0])
- kstrdup(&cv->owner, d.uid);
- cv->perm = d.mode & 0777;
- }
- return n;
- }
- void
- closeconv(Conv *cv)
- {
- Conv *nc;
- Ipmulti *mp;
- qlock(cv);
- if(--cv->inuse > 0) {
- qunlock(cv);
- 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);
- }
- cv->incall = nil;
- kstrdup(&cv->owner, network);
- cv->perm = 0660;
- while((mp = cv->multi) != nil)
- ipifcremmulti(cv, mp->ma, mp->ia);
- cv->r = nil;
- cv->rgen = 0;
- cv->p->close(cv);
- cv->state = Idle;
- qunlock(cv);
- }
- static void
- ipclose(Chan* c)
- {
- Fs *f;
- f = ipfs[c->dev];
- switch(TYPE(c->qid)) {
- default:
- break;
- case Qlog:
- if(c->flag & COPEN)
- netlogclose(f);
- break;
- case Qdata:
- case Qctl:
- case Qerr:
- if(c->flag & COPEN)
- closeconv(f->p[PROTO(c->qid)]->conv[CONV(c->qid)]);
- break;
- case Qsnoop:
- if(c->flag & COPEN)
- decref(&f->p[PROTO(c->qid)]->conv[CONV(c->qid)]->snoopers);
- break;
- }
- free(((IPaux*)c->aux)->owner);
- free(c->aux);
- }
- enum
- {
- Statelen= 32*1024,
- };
- static long
- ipread(Chan *ch, void *a, long n, vlong off)
- {
- Conv *c;
- Proto *x;
- char *buf, *p;
- long rv;
- Fs *f;
- ulong offset = off;
- f = ipfs[ch->dev];
- 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:
- return arpread(f->arp, a, offset, n);
- case Qbootp:
- return bootpread(a, offset, n);
- case Qndb:
- return readstr(offset, a, n, f->ndb);
- case Qiproute:
- return routeread(f, a, offset, n);
- case Qipselftab:
- return ipselftabread(f, a, offset, n);
- case Qlog:
- return netlogread(f, a, offset, n);
- case Qctl:
- buf = smalloc(16);
- sprint(buf, "%lud", CONV(ch->qid));
- rv = readstr(offset, p, n, buf);
- free(buf);
- return rv;
- case Qremote:
- buf = smalloc(Statelen);
- 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);
- }
- rv = readstr(offset, p, n, buf);
- free(buf);
- return rv;
- case Qlocal:
- buf = smalloc(Statelen);
- x = f->p[PROTO(ch->qid)];
- 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;
- case Qstatus:
- buf = smalloc(Statelen);
- x = f->p[PROTO(ch->qid)];
- c = x->conv[CONV(ch->qid)];
- (*x->state)(c, buf, Statelen-2);
- rv = readstr(offset, p, n, buf);
- free(buf);
- return rv;
- case Qdata:
- c = f->p[PROTO(ch->qid)]->conv[CONV(ch->qid)];
- return qread(c->rq, a, n);
- case Qerr:
- c = f->p[PROTO(ch->qid)]->conv[CONV(ch->qid)];
- return qread(c->eq, a, n);
- case Qsnoop:
- c = f->p[PROTO(ch->qid)]->conv[CONV(ch->qid)];
- return qread(c->sq, a, n);
- case Qstats:
- x = f->p[PROTO(ch->qid)];
- if(x->stats == nil)
- error("stats not implemented");
- buf = smalloc(Statelen);
- (*x->stats)(x, buf, Statelen);
- rv = readstr(offset, p, n, buf);
- free(buf);
- return rv;
- }
- }
- static Block*
- ipbread(Chan* ch, long n, ulong offset)
- {
- Conv *c;
- Proto *x;
- Fs *f;
- switch(TYPE(ch->qid)){
- case Qdata:
- f = ipfs[ch->dev];
- x = f->p[PROTO(ch->qid)];
- c = x->conv[CONV(ch->qid)];
- return qbread(c->rq, n);
- default:
- return devbread(ch, n, offset);
- }
- }
- /*
- * set local address to be that of the ifc closest to remote address
- */
- static void
- setladdr(Conv* c)
- {
- findlocalip(c->p->f, c->laddr, c->raddr);
- }
- /*
- * set a local port making sure the quad of raddr,rport,laddr,lport is unique
- */
- char*
- setluniqueport(Conv* c, int lport)
- {
- Proto *p;
- Conv *xp;
- int x;
- p = c->p;
- qlock(p);
- for(x = 0; x < p->nc; x++){
- xp = p->conv[x];
- if(xp == nil)
- break;
- if(xp == c)
- continue;
- if((xp->state == Connected || xp->state == Announced)
- && xp->lport == lport
- && xp->rport == c->rport
- && ipcmp(xp->raddr, c->raddr) == 0
- && ipcmp(xp->laddr, c->laddr) == 0){
- qunlock(p);
- return "address in use";
- }
- }
- c->lport = lport;
- qunlock(p);
- return nil;
- }
- /*
- * pick a local port and set it
- */
- void
- setlport(Conv* c)
- {
- Proto *p;
- ushort *pp;
- int x, found;
- p = c->p;
- if(c->restricted)
- pp = &p->nextrport;
- else
- pp = &p->nextport;
- qlock(p);
- for(;;(*pp)++){
- /*
- * 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
- * has wrapped round, select a random port between 5000 and 1<<15
- * to start at.
- */
- if(c->restricted){
- if(*pp >= 1024)
- *pp = 600;
- }
- else while(*pp < 5000)
- *pp = nrand(1<<15);
- 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)++;
- qunlock(p);
- }
- /*
- * set a local address and port from a string of the form
- * [address!]port[!r]
- */
- char*
- setladdrport(Conv* c, char* str, int announcing)
- {
- char *p;
- char *rv;
- ushort lport;
- uchar addr[IPaddrlen];
- rv = nil;
- /*
- * ignore restricted part if it exists. it's
- * meaningless on local ports.
- */
- p = strchr(str, '!');
- if(p != nil){
- *p++ = 0;
- if(strcmp(p, "r") == 0)
- p = nil;
- }
- c->lport = 0;
- if(p == nil){
- if(announcing)
- ipmove(c->laddr, IPnoaddr);
- else
- setladdr(c);
- p = str;
- } else {
- if(strcmp(str, "*") == 0)
- ipmove(c->laddr, IPnoaddr);
- else {
- parseip(addr, str);
- if(ipforme(c->p->f, addr))
- ipmove(c->laddr, addr);
- else
- return "not a local IP address";
- }
- }
- /* one process can get all connections */
- if(announcing && strcmp(p, "*") == 0){
- if(!iseve())
- error(Eperm);
- return setluniqueport(c, 0);
- }
- lport = atoi(p);
- if(lport <= 0)
- setlport(c);
- else
- rv = setluniqueport(c, lport);
- return rv;
- }
- static char*
- setraddrport(Conv* c, char* str)
- {
- char *p;
- p = strchr(str, '!');
- if(p == nil)
- return "malformed address";
- *p++ = 0;
- parseip(c->raddr, str);
- c->rport = atoi(p);
- p = strchr(p, '!');
- if(p){
- if(strstr(p, "!r") != nil)
- c->restricted = 1;
- }
- return nil;
- }
- /*
- * 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;
- p = setladdrport(c, argv[2], 0);
- if(p != nil)
- return p;
- }
- if( (memcmp(c->raddr, v4prefix, IPv4off) == 0 &&
- memcmp(c->laddr, v4prefix, IPv4off) == 0)
- || ipcmp(c->raddr, IPnoaddr) == 0)
- c->ipversion = V4;
- else
- c->ipversion = V6;
- return nil;
- }
- /*
- * initiate connection and sleep till its set up
- */
- static int
- connected(void* a)
- {
- return ((Conv*)a)->state == Connected;
- }
- static void
- connectctlmsg(Proto *x, Conv *c, Cmdbuf *cb)
- {
- char *p;
- if(c->state != 0)
- error(Econinuse);
- 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);
- qunlock(c);
- if(waserror()){
- qlock(c);
- nexterror();
- }
- sleep(&c->cr, connected, c);
- qlock(c);
- poperror();
- if(c->cerr[0] != '\0')
- error(c->cerr);
- }
- /*
- * called by protocol announce routine to set addresses
- */
- char*
- Fsstdannounce(Conv* c, char* argv[], int argc)
- {
- memset(c->raddr, 0, sizeof(c->raddr));
- c->rport = 0;
- switch(argc){
- default:
- return "bad args to announce";
- case 2:
- return setladdrport(c, argv[1], 1);
- }
- return nil;
- }
- /*
- * initiate announcement and sleep till its set up
- */
- static int
- announced(void* a)
- {
- return ((Conv*)a)->state == Announced;
- }
- static void
- announcectlmsg(Proto *x, Conv *c, Cmdbuf *cb)
- {
- char *p;
- if(c->state != 0)
- error(Econinuse);
- 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);
- qunlock(c);
- if(waserror()){
- qlock(c);
- nexterror();
- }
- sleep(&c->cr, announced, c);
- qlock(c);
- poperror();
- if(c->cerr[0] != '\0')
- error(c->cerr);
- }
- /*
- * called by protocol bind routine to set addresses
- */
- char*
- Fsstdbind(Conv* c, char* argv[], int argc)
- {
- switch(argc){
- default:
- return "bad args to bind";
- case 2:
- return setladdrport(c, argv[1], 0);
- }
- 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
- tosctlmsg(Conv *c, Cmdbuf *cb)
- {
- if(cb->nf < 2)
- c->tos = 0;
- else
- c->tos = atoi(cb->f[1]);
- }
- static void
- ttlctlmsg(Conv *c, Cmdbuf *cb)
- {
- if(cb->nf < 2)
- c->ttl = MAXTTL;
- else
- c->ttl = atoi(cb->f[1]);
- }
- static long
- ipwrite(Chan* ch, void *v, long n, vlong off)
- {
- Conv *c;
- Proto *x;
- char *p;
- Cmdbuf *cb;
- uchar ia[IPaddrlen], ma[IPaddrlen];
- Fs *f;
- char *a;
- ulong offset = off;
- a = v;
- f = ipfs[ch->dev];
- switch(TYPE(ch->qid)){
- default:
- error(Eperm);
- case Qdata:
- x = f->p[PROTO(ch->qid)];
- c = x->conv[CONV(ch->qid)];
- if(c->wq == nil)
- error(Eperm);
- qwrite(c->wq, a, n);
- break;
- case Qarp:
- return arpwrite(f, a, n);
- case Qiproute:
- return routewrite(f, ch, a, n);
- case Qlog:
- netlogctl(f, a, n);
- return n;
- case Qndb:
- return ndbwrite(f, a, offset, n);
- break;
- case Qctl:
- x = f->p[PROTO(ch->qid)];
- c = x->conv[CONV(ch->qid)];
- cb = parsecmd(a, n);
- qlock(c);
- if(waserror()) {
- qunlock(c);
- free(cb);
- nexterror();
- }
- if(cb->nf < 1)
- error("short control request");
- 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], "tos") == 0)
- tosctlmsg(c, cb);
- else if(strcmp(cb->f[0], "ignoreadvice") == 0)
- c->ignoreadvice = 1;
- else if(strcmp(cb->f[0], "addmulti") == 0){
- if(cb->nf < 2)
- error("addmulti needs interface address");
- 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);
- }
- } 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);
- if(p != nil)
- error(p);
- } else
- error("unknown control request");
- qunlock(c);
- free(cb);
- poperror();
- }
- return n;
- }
- static long
- ipbwrite(Chan* ch, Block* bp, ulong offset)
- {
- Conv *c;
- Proto *x;
- Fs *f;
- int n;
- switch(TYPE(ch->qid)){
- case Qdata:
- f = ipfs[ch->dev];
- x = f->p[PROTO(ch->qid)];
- c = x->conv[CONV(ch->qid)];
- if(c->wq == nil)
- error(Eperm);
- if(bp->next)
- bp = concatblock(bp);
- n = BLEN(bp);
- qbwrite(c->wq, bp);
- return n;
- default:
- return devbwrite(ch, bp, offset);
- }
- }
- Dev ipdevtab = {
- 'I',
- "ip",
- ipreset,
- devinit,
- devshutdown,
- ipattach,
- ipwalk,
- ipstat,
- ipopen,
- ipcreate,
- ipclose,
- ipread,
- ipbread,
- ipwrite,
- ipbwrite,
- ipremove,
- ipwstat,
- };
- int
- Fsproto(Fs *f, Proto *p)
- {
- if(f->np >= Maxproto)
- return -1;
- p->f = f;
- if(p->ipproto > 0){
- if(f->t2p[p->ipproto] != nil)
- return -1;
- f->t2p[p->ipproto] = p;
- }
- p->qid.type = QTDIR;
- p->qid.path = QID(f->np, 0, Qprotodir);
- p->conv = malloc(sizeof(Conv*)*(p->nc+1));
- if(p->conv == nil)
- panic("Fsproto");
- p->x = f->np;
- p->nextport = 0;
- p->nextrport = 600;
- f->p[f->np++] = p;
- return 0;
- }
- /*
- * return true if this protocol is
- * built in
- */
- int
- Fsbuiltinproto(Fs* f, uchar proto)
- {
- return f->t2p[proto] != nil;
- }
- /*
- * called with protocol locked
- */
- Conv*
- Fsprotoclone(Proto *p, char *user)
- {
- Conv *c, **pp, **ep;
- retry:
- 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);
- qlock(c);
- c->p = p;
- c->x = pp - p->conv;
- if(p->ptclsize != 0){
- c->ptcl = malloc(p->ptclsize);
- if(c->ptcl == nil) {
- free(c);
- error(Enomem);
- }
- }
- *pp = c;
- p->ac++;
- c->eq = qopen(1024, Qmsg, 0, 0);
- (*p->create)(c);
- break;
- }
- if(canqlock(c)){
- /*
- * make sure both processes and protocol
- * are done with this Conv
- */
- if(c->inuse == 0 && (p->inuse == nil || (*p->inuse)(c) == 0))
- break;
- qunlock(c);
- }
- }
- if(pp >= ep) {
- if(p->gc != nil && (*p->gc)(p))
- goto retry;
- return nil;
- }
- c->inuse = 1;
- kstrdup(&c->owner, user);
- c->perm = 0660;
- c->state = Idle;
- ipmove(c->laddr, IPnoaddr);
- ipmove(c->raddr, IPnoaddr);
- c->r = nil;
- c->rgen = 0;
- c->lport = 0;
- c->rport = 0;
- c->restricted = 0;
- c->ttl = MAXTTL;
- qreopen(c->rq);
- qreopen(c->wq);
- qreopen(c->eq);
- qunlock(c);
- return c;
- }
- int
- Fsconnected(Conv* c, char* msg)
- {
- if(msg != nil && *msg != '\0')
- strncpy(c->cerr, msg, ERRMAX-1);
- switch(c->state){
- case Announcing:
- c->state = Announced;
- break;
- case Connecting:
- c->state = Connected;
- break;
- }
- wakeup(&c->cr);
- return 0;
- }
- Proto*
- Fsrcvpcol(Fs* f, uchar proto)
- {
- if(f->ipmux)
- return f->ipmux;
- else
- return f->t2p[proto];
- }
- Proto*
- Fsrcvpcolx(Fs *f, uchar proto)
- {
- return f->t2p[proto];
- }
- /*
- * called with protocol locked
- */
- Conv*
- Fsnewcall(Conv *c, uchar *raddr, ushort rport, uchar *laddr, ushort lport, uchar version)
- {
- Conv *nc;
- Conv **l;
- int i;
- qlock(c);
- i = 0;
- for(l = &c->incall; *l; l = &(*l)->next)
- i++;
- if(i >= Maxincall) {
- qunlock(c);
- return nil;
- }
- /* find a free conversation */
- nc = Fsprotoclone(c->p, network);
- if(nc == nil) {
- qunlock(c);
- return nil;
- }
- ipmove(nc->raddr, raddr);
- nc->rport = rport;
- ipmove(nc->laddr, laddr);
- nc->lport = lport;
- nc->next = nil;
- *l = nc;
- nc->state = Connected;
- nc->ipversion = version;
- qunlock(c);
- wakeup(&c->listenr);
- return nc;
- }
- long
- ndbwrite(Fs *f, char *a, ulong off, int n)
- {
- if(off > strlen(f->ndb))
- error(Eio);
- if(off+n >= sizeof(f->ndb))
- error(Eio);
- memmove(f->ndb+off, a, n);
- f->ndb[off+n] = 0;
- f->ndbvers++;
- f->ndbmtime = seconds();
- return n;
- }
- ulong
- scalednconv(void)
- {
- if(cpuserver && conf.npage*BY2PG >= 128*MB)
- return Nchans*4;
- return Nchans;
- }
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