1 #include "u.h"
2 #include "../port/lib.h"
3 #include "mem.h"
4 #include "dat.h"
5 #include "fns.h"
6 #include "../port/error.h"
7 #include "../port/netif.h"
8
9 static int netown(Netfile*, char*, int);
10 static int openfile(Netif*, int);
11 static char* matchtoken(char*, char*);
12 static char* netmulti(Netif*, Netfile*, uchar*, int);
13 static int parseaddr(uchar*, char*, int);
14
15 /*
16 * set up a new network interface
17 */
18 void
netifinit(Netif * nif,char * name,int nfile,ulong limit)19 netifinit(Netif *nif, char *name, int nfile, ulong limit)
20 {
21 strncpy(nif->name, name, KNAMELEN-1);
22 nif->name[KNAMELEN-1] = 0;
23 nif->nfile = nfile;
24 nif->f = xalloc(nfile*sizeof(Netfile*));
25 if (nif->f == nil)
26 panic("netifinit: no memory");
27 memset(nif->f, 0, nfile*sizeof(Netfile*));
28 nif->limit = limit;
29 }
30
31 /*
32 * generate a 3 level directory
33 */
34 static int
netifgen(Chan * c,char *,Dirtab * vp,int,int i,Dir * dp)35 netifgen(Chan *c, char*, Dirtab *vp, int, int i, Dir *dp)
36 {
37 Qid q;
38 Netif *nif = (Netif*)vp;
39 Netfile *f;
40 int t;
41 int perm;
42 char *o;
43
44 q.type = QTFILE;
45 q.vers = 0;
46
47 /* top level directory contains the name of the network */
48 if(c->qid.path == 0){
49 switch(i){
50 case DEVDOTDOT:
51 q.path = 0;
52 q.type = QTDIR;
53 devdir(c, q, ".", 0, eve, 0555, dp);
54 break;
55 case 0:
56 q.path = N2ndqid;
57 q.type = QTDIR;
58 strcpy(up->genbuf, nif->name);
59 devdir(c, q, up->genbuf, 0, eve, 0555, dp);
60 break;
61 default:
62 return -1;
63 }
64 return 1;
65 }
66
67 /* second level contains clone plus all the conversations */
68 t = NETTYPE(c->qid.path);
69 if(t == N2ndqid || t == Ncloneqid || t == Naddrqid || t == Nstatqid || t == Nifstatqid){
70 switch(i) {
71 case DEVDOTDOT:
72 q.type = QTDIR;
73 q.path = 0;
74 devdir(c, q, ".", 0, eve, DMDIR|0555, dp);
75 break;
76 case 0:
77 q.path = Ncloneqid;
78 devdir(c, q, "clone", 0, eve, 0666, dp);
79 break;
80 case 1:
81 q.path = Naddrqid;
82 devdir(c, q, "addr", 0, eve, 0666, dp);
83 break;
84 case 2:
85 q.path = Nstatqid;
86 devdir(c, q, "stats", 0, eve, 0444, dp);
87 break;
88 case 3:
89 q.path = Nifstatqid;
90 devdir(c, q, "ifstats", 0, eve, 0444, dp);
91 break;
92 default:
93 i -= 4;
94 if(i >= nif->nfile)
95 return -1;
96 if(nif->f[i] == 0)
97 return 0;
98 q.type = QTDIR;
99 q.path = NETQID(i, N3rdqid);
100 snprint(up->genbuf, sizeof up->genbuf, "%d", i);
101 devdir(c, q, up->genbuf, 0, eve, DMDIR|0555, dp);
102 break;
103 }
104 return 1;
105 }
106
107 /* third level */
108 f = nif->f[NETID(c->qid.path)];
109 if(f == 0)
110 return 0;
111 if(*f->owner){
112 o = f->owner;
113 perm = f->mode;
114 } else {
115 o = eve;
116 perm = 0666;
117 }
118 switch(i){
119 case DEVDOTDOT:
120 q.type = QTDIR;
121 q.path = N2ndqid;
122 strcpy(up->genbuf, nif->name);
123 devdir(c, q, up->genbuf, 0, eve, DMDIR|0555, dp);
124 break;
125 case 0:
126 q.path = NETQID(NETID(c->qid.path), Ndataqid);
127 devdir(c, q, "data", 0, o, perm, dp);
128 break;
129 case 1:
130 q.path = NETQID(NETID(c->qid.path), Nctlqid);
131 devdir(c, q, "ctl", 0, o, perm, dp);
132 break;
133 case 2:
134 q.path = NETQID(NETID(c->qid.path), Nstatqid);
135 devdir(c, q, "stats", 0, eve, 0444, dp);
136 break;
137 case 3:
138 q.path = NETQID(NETID(c->qid.path), Ntypeqid);
139 devdir(c, q, "type", 0, eve, 0444, dp);
140 break;
141 case 4:
142 q.path = NETQID(NETID(c->qid.path), Nifstatqid);
143 devdir(c, q, "ifstats", 0, eve, 0444, dp);
144 break;
145 default:
146 return -1;
147 }
148 return 1;
149 }
150
151 Walkqid*
netifwalk(Netif * nif,Chan * c,Chan * nc,char ** name,int nname)152 netifwalk(Netif *nif, Chan *c, Chan *nc, char **name, int nname)
153 {
154 return devwalk(c, nc, name, nname, (Dirtab *)nif, 0, netifgen);
155 }
156
157 Chan*
netifopen(Netif * nif,Chan * c,int omode)158 netifopen(Netif *nif, Chan *c, int omode)
159 {
160 int id;
161 Netfile *f;
162
163 id = 0;
164 if(c->qid.type & QTDIR){
165 if(omode != OREAD)
166 error(Eperm);
167 } else {
168 switch(NETTYPE(c->qid.path)){
169 case Ndataqid:
170 case Nctlqid:
171 id = NETID(c->qid.path);
172 openfile(nif, id);
173 break;
174 case Ncloneqid:
175 id = openfile(nif, -1);
176 c->qid.path = NETQID(id, Nctlqid);
177 break;
178 default:
179 if(omode != OREAD)
180 error(Ebadarg);
181 }
182 switch(NETTYPE(c->qid.path)){
183 case Ndataqid:
184 case Nctlqid:
185 f = nif->f[id];
186 if(netown(f, up->user, omode&7) < 0)
187 error(Eperm);
188 break;
189 }
190 }
191 c->mode = openmode(omode);
192 c->flag |= COPEN;
193 c->offset = 0;
194 c->iounit = qiomaxatomic;
195 return c;
196 }
197
198 long
netifread(Netif * nif,Chan * c,void * a,long n,ulong offset)199 netifread(Netif *nif, Chan *c, void *a, long n, ulong offset)
200 {
201 int i, j;
202 Netfile *f;
203 char *p;
204
205 if(c->qid.type&QTDIR)
206 return devdirread(c, a, n, (Dirtab*)nif, 0, netifgen);
207
208 switch(NETTYPE(c->qid.path)){
209 case Ndataqid:
210 f = nif->f[NETID(c->qid.path)];
211 return qread(f->in, a, n);
212 case Nctlqid:
213 return readnum(offset, a, n, NETID(c->qid.path), NUMSIZE);
214 case Nstatqid:
215 p = malloc(READSTR);
216 if(p == nil)
217 error(Enomem);
218 j = snprint(p, READSTR, "in: %llud\n", nif->inpackets);
219 j += snprint(p+j, READSTR-j, "link: %d\n", nif->link);
220 j += snprint(p+j, READSTR-j, "out: %llud\n", nif->outpackets);
221 j += snprint(p+j, READSTR-j, "crc errs: %d\n", nif->crcs);
222 j += snprint(p+j, READSTR-j, "overflows: %d\n", nif->overflows);
223 j += snprint(p+j, READSTR-j, "soft overflows: %d\n", nif->soverflows);
224 j += snprint(p+j, READSTR-j, "framing errs: %d\n", nif->frames);
225 j += snprint(p+j, READSTR-j, "buffer errs: %d\n", nif->buffs);
226 j += snprint(p+j, READSTR-j, "output errs: %d\n", nif->oerrs);
227 j += snprint(p+j, READSTR-j, "prom: %d\n", nif->prom);
228 j += snprint(p+j, READSTR-j, "mbps: %d\n", nif->mbps);
229 j += snprint(p+j, READSTR-j, "addr: ");
230 for(i = 0; i < nif->alen; i++)
231 j += snprint(p+j, READSTR-j, "%2.2ux", nif->addr[i]);
232 snprint(p+j, READSTR-j, "\n");
233 n = readstr(offset, a, n, p);
234 free(p);
235 return n;
236 case Naddrqid:
237 p = malloc(READSTR);
238 if(p == nil)
239 error(Enomem);
240 j = 0;
241 for(i = 0; i < nif->alen; i++)
242 j += snprint(p+j, READSTR-j, "%2.2ux", nif->addr[i]);
243 n = readstr(offset, a, n, p);
244 free(p);
245 return n;
246 case Ntypeqid:
247 f = nif->f[NETID(c->qid.path)];
248 return readnum(offset, a, n, f->type, NUMSIZE);
249 case Nifstatqid:
250 return 0;
251 }
252 error(Ebadarg);
253 return -1; /* not reached */
254 }
255
256 Block*
netifbread(Netif * nif,Chan * c,long n,ulong offset)257 netifbread(Netif *nif, Chan *c, long n, ulong offset)
258 {
259 if((c->qid.type & QTDIR) || NETTYPE(c->qid.path) != Ndataqid)
260 return devbread(c, n, offset);
261
262 return qbread(nif->f[NETID(c->qid.path)]->in, n);
263 }
264
265 /*
266 * make sure this type isn't already in use on this device
267 */
268 static int
typeinuse(Netif * nif,int type)269 typeinuse(Netif *nif, int type)
270 {
271 Netfile *f, **fp, **efp;
272
273 if(type <= 0)
274 return 0;
275
276 efp = &nif->f[nif->nfile];
277 for(fp = nif->f; fp < efp; fp++){
278 f = *fp;
279 if(f == 0)
280 continue;
281 if(f->type == type)
282 return 1;
283 }
284 return 0;
285 }
286
287 /*
288 * the devxxx.c that calls us handles writing data, it knows best
289 */
290 long
netifwrite(Netif * nif,Chan * c,void * a,long n)291 netifwrite(Netif *nif, Chan *c, void *a, long n)
292 {
293 Netfile *f;
294 int type;
295 char *p, buf[64];
296 uchar binaddr[Nmaxaddr];
297
298 if(NETTYPE(c->qid.path) != Nctlqid)
299 error(Eperm);
300
301 if(n >= sizeof(buf))
302 n = sizeof(buf)-1;
303 memmove(buf, a, n);
304 buf[n] = 0;
305
306 if(waserror()){
307 qunlock(nif);
308 nexterror();
309 }
310
311 qlock(nif);
312 f = nif->f[NETID(c->qid.path)];
313 if((p = matchtoken(buf, "connect")) != 0){
314 type = atoi(p);
315 if(typeinuse(nif, type))
316 error(Einuse);
317 f->type = type;
318 if(f->type < 0)
319 nif->all++;
320 } else if(matchtoken(buf, "promiscuous")){
321 if(f->prom == 0){
322 if(nif->prom == 0 && nif->promiscuous != nil)
323 nif->promiscuous(nif->arg, 1);
324 f->prom = 1;
325 nif->prom++;
326 }
327 } else if((p = matchtoken(buf, "scanbs")) != 0){
328 /* scan for base stations */
329 if(f->scan == 0){
330 type = atoi(p);
331 if(type < 5)
332 type = 5;
333 if(nif->scanbs != nil)
334 nif->scanbs(nif->arg, type);
335 f->scan = type;
336 nif->scan++;
337 }
338 } else if(matchtoken(buf, "bridge")){
339 f->bridge = 1;
340 } else if(matchtoken(buf, "headersonly")){
341 f->headersonly = 1;
342 } else if((p = matchtoken(buf, "addmulti")) != 0){
343 if(parseaddr(binaddr, p, nif->alen) < 0)
344 error("bad address");
345 p = netmulti(nif, f, binaddr, 1);
346 if(p)
347 error(p);
348 } else if((p = matchtoken(buf, "remmulti")) != 0){
349 if(parseaddr(binaddr, p, nif->alen) < 0)
350 error("bad address");
351 p = netmulti(nif, f, binaddr, 0);
352 if(p)
353 error(p);
354 } else
355 n = -1;
356 qunlock(nif);
357 poperror();
358 return n;
359 }
360
361 int
netifwstat(Netif * nif,Chan * c,uchar * db,int n)362 netifwstat(Netif *nif, Chan *c, uchar *db, int n)
363 {
364 Dir *dir;
365 Netfile *f;
366 int m;
367
368 f = nif->f[NETID(c->qid.path)];
369 if(f == 0)
370 error(Enonexist);
371
372 if(netown(f, up->user, OWRITE) < 0)
373 error(Eperm);
374
375 dir = smalloc(sizeof(Dir)+n);
376 m = convM2D(db, n, &dir[0], (char*)&dir[1]);
377 if(m == 0){
378 free(dir);
379 error(Eshortstat);
380 }
381 if(!emptystr(dir[0].uid)){
382 strncpy(f->owner, dir[0].uid, KNAMELEN-1);
383 f->owner[KNAMELEN-1] = 0;
384 }
385 if(dir[0].mode != ~0UL)
386 f->mode = dir[0].mode;
387 free(dir);
388 return m;
389 }
390
391 int
netifstat(Netif * nif,Chan * c,uchar * db,int n)392 netifstat(Netif *nif, Chan *c, uchar *db, int n)
393 {
394 return devstat(c, db, n, (Dirtab *)nif, 0, netifgen);
395 }
396
397 void
netifclose(Netif * nif,Chan * c)398 netifclose(Netif *nif, Chan *c)
399 {
400 Netfile *f;
401 int t;
402 Netaddr *ap;
403
404 if((c->flag & COPEN) == 0)
405 return;
406
407 t = NETTYPE(c->qid.path);
408 if(t != Ndataqid && t != Nctlqid)
409 return;
410
411 f = nif->f[NETID(c->qid.path)];
412 qlock(f);
413 if(--(f->inuse) == 0){
414 if(f->prom){
415 qlock(nif);
416 if(--(nif->prom) == 0 && nif->promiscuous != nil)
417 nif->promiscuous(nif->arg, 0);
418 qunlock(nif);
419 f->prom = 0;
420 }
421 if(f->scan){
422 qlock(nif);
423 if(--(nif->scan) == 0 && nif->scanbs != nil)
424 nif->scanbs(nif->arg, 0);
425 qunlock(nif);
426 f->prom = 0;
427 f->scan = 0;
428 }
429 if(f->nmaddr){
430 qlock(nif);
431 t = 0;
432 for(ap = nif->maddr; ap; ap = ap->next){
433 if(f->maddr[t/8] & (1<<(t%8)))
434 netmulti(nif, f, ap->addr, 0);
435 }
436 qunlock(nif);
437 f->nmaddr = 0;
438 }
439 if(f->type < 0){
440 qlock(nif);
441 --(nif->all);
442 qunlock(nif);
443 }
444 f->owner[0] = 0;
445 f->type = 0;
446 f->bridge = 0;
447 f->headersonly = 0;
448 qclose(f->in);
449 }
450 qunlock(f);
451 }
452
453 Lock netlock;
454
455 static int
netown(Netfile * p,char * o,int omode)456 netown(Netfile *p, char *o, int omode)
457 {
458 static int access[] = { 0400, 0200, 0600, 0100 };
459 int mode;
460 int t;
461
462 lock(&netlock);
463 if(*p->owner){
464 if(strncmp(o, p->owner, KNAMELEN) == 0) /* User */
465 mode = p->mode;
466 else if(strncmp(o, eve, KNAMELEN) == 0) /* Bootes is group */
467 mode = p->mode<<3;
468 else
469 mode = p->mode<<6; /* Other */
470
471 t = access[omode&3];
472 if((t & mode) == t){
473 unlock(&netlock);
474 return 0;
475 } else {
476 unlock(&netlock);
477 return -1;
478 }
479 }
480 strncpy(p->owner, o, KNAMELEN-1);
481 p->owner[KNAMELEN-1] = 0;
482 p->mode = 0660;
483 unlock(&netlock);
484 return 0;
485 }
486
487 /*
488 * Increment the reference count of a network device.
489 * If id < 0, return an unused ether device.
490 */
491 static int
openfile(Netif * nif,int id)492 openfile(Netif *nif, int id)
493 {
494 Netfile *f, **fp, **efp;
495
496 if(id >= 0){
497 f = nif->f[id];
498 if(f == 0)
499 error(Enodev);
500 qlock(f);
501 qreopen(f->in);
502 f->inuse++;
503 qunlock(f);
504 return id;
505 }
506
507 qlock(nif);
508 if(waserror()){
509 qunlock(nif);
510 nexterror();
511 }
512 efp = &nif->f[nif->nfile];
513 for(fp = nif->f; fp < efp; fp++){
514 f = *fp;
515 if(f == 0){
516 f = malloc(sizeof(Netfile));
517 if(f == 0)
518 exhausted("memory");
519 f->in = qopen(nif->limit, Qmsg, 0, 0);
520 if(f->in == nil){
521 free(f);
522 exhausted("memory");
523 }
524 *fp = f;
525 qlock(f);
526 } else {
527 qlock(f);
528 if(f->inuse){
529 qunlock(f);
530 continue;
531 }
532 }
533 f->inuse = 1;
534 qreopen(f->in);
535 netown(f, up->user, 0);
536 qunlock(f);
537 qunlock(nif);
538 poperror();
539 return fp - nif->f;
540 }
541 error(Enodev);
542 return -1; /* not reached */
543 }
544
545 /*
546 * look for a token starting a string,
547 * return a pointer to first non-space char after it
548 */
549 static char*
matchtoken(char * p,char * token)550 matchtoken(char *p, char *token)
551 {
552 int n;
553
554 n = strlen(token);
555 if(strncmp(p, token, n))
556 return 0;
557 p += n;
558 if(*p == 0)
559 return p;
560 if(*p != ' ' && *p != '\t' && *p != '\n')
561 return 0;
562 while(*p == ' ' || *p == '\t' || *p == '\n')
563 p++;
564 return p;
565 }
566
567 void
hnputv(void * p,uvlong v)568 hnputv(void *p, uvlong v)
569 {
570 uchar *a;
571
572 a = p;
573 hnputl(a, v>>32);
574 hnputl(a+4, v);
575 }
576
577 void
hnputl(void * p,uint v)578 hnputl(void *p, uint v)
579 {
580 uchar *a;
581
582 a = p;
583 a[0] = v>>24;
584 a[1] = v>>16;
585 a[2] = v>>8;
586 a[3] = v;
587 }
588
589 void
hnputs(void * p,ushort v)590 hnputs(void *p, ushort v)
591 {
592 uchar *a;
593
594 a = p;
595 a[0] = v>>8;
596 a[1] = v;
597 }
598
599 uvlong
nhgetv(void * p)600 nhgetv(void *p)
601 {
602 uchar *a;
603
604 a = p;
605 return ((vlong)nhgetl(a) << 32) | nhgetl(a+4);
606 }
607
608 uint
nhgetl(void * p)609 nhgetl(void *p)
610 {
611 uchar *a;
612
613 a = p;
614 return (a[0]<<24)|(a[1]<<16)|(a[2]<<8)|(a[3]<<0);
615 }
616
617 ushort
nhgets(void * p)618 nhgets(void *p)
619 {
620 uchar *a;
621
622 a = p;
623 return (a[0]<<8)|(a[1]<<0);
624 }
625
626 static ulong
hash(uchar * a,int len)627 hash(uchar *a, int len)
628 {
629 ulong sum = 0;
630
631 while(len-- > 0)
632 sum = (sum << 1) + *a++;
633 return sum%Nmhash;
634 }
635
636 int
activemulti(Netif * nif,uchar * addr,int alen)637 activemulti(Netif *nif, uchar *addr, int alen)
638 {
639 Netaddr *hp;
640
641 for(hp = nif->mhash[hash(addr, alen)]; hp; hp = hp->hnext)
642 if(memcmp(addr, hp->addr, alen) == 0){
643 if(hp->ref)
644 return 1;
645 else
646 break;
647 }
648 return 0;
649 }
650
651 static int
parseaddr(uchar * to,char * from,int alen)652 parseaddr(uchar *to, char *from, int alen)
653 {
654 char nip[4];
655 char *p;
656 int i;
657
658 p = from;
659 for(i = 0; i < alen; i++){
660 if(*p == 0)
661 return -1;
662 nip[0] = *p++;
663 if(*p == 0)
664 return -1;
665 nip[1] = *p++;
666 nip[2] = 0;
667 to[i] = strtoul(nip, 0, 16);
668 if(*p == ':')
669 p++;
670 }
671 return 0;
672 }
673
674 /*
675 * keep track of multicast addresses
676 */
677 static char*
netmulti(Netif * nif,Netfile * f,uchar * addr,int add)678 netmulti(Netif *nif, Netfile *f, uchar *addr, int add)
679 {
680 Netaddr **l, *ap;
681 int i;
682 ulong h;
683
684 if(nif->multicast == nil)
685 return "interface does not support multicast";
686
687 l = &nif->maddr;
688 i = 0;
689 for(ap = *l; ap; ap = *l){
690 if(memcmp(addr, ap->addr, nif->alen) == 0)
691 break;
692 i++;
693 l = &ap->next;
694 }
695
696 if(add){
697 if(ap == 0){
698 *l = ap = smalloc(sizeof(*ap));
699 memmove(ap->addr, addr, nif->alen);
700 ap->next = 0;
701 ap->ref = 1;
702 h = hash(addr, nif->alen);
703 ap->hnext = nif->mhash[h];
704 nif->mhash[h] = ap;
705 } else {
706 ap->ref++;
707 }
708 if(ap->ref == 1){
709 nif->nmaddr++;
710 nif->multicast(nif->arg, addr, 1);
711 }
712 if(i < 8*sizeof(f->maddr)){
713 if((f->maddr[i/8] & (1<<(i%8))) == 0)
714 f->nmaddr++;
715 f->maddr[i/8] |= 1<<(i%8);
716 }
717 } else {
718 if(ap == 0 || ap->ref == 0)
719 return 0;
720 ap->ref--;
721 if(ap->ref == 0){
722 nif->nmaddr--;
723 nif->multicast(nif->arg, addr, 0);
724 }
725 if(i < 8*sizeof(f->maddr)){
726 if((f->maddr[i/8] & (1<<(i%8))) != 0)
727 f->nmaddr--;
728 f->maddr[i/8] &= ~(1<<(i%8));
729 }
730 }
731 return 0;
732 }
733