fix #>&- syntax for closing fds
[oweals/busybox.git] / networking / tc.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * tc.c         "tc" utility frontend.
4  *
5  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
6  *
7  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8  *
9  * Bernhard Reutner-Fischer adjusted for busybox
10  */
11
12 #include "libbb.h"
13
14 #include "libiproute/utils.h"
15 #include "libiproute/ip_common.h"
16 #include "libiproute/rt_names.h"
17 #include <linux/pkt_sched.h> /* for the TC_H_* macros */
18
19 #define parse_rtattr_nested(tb, max, rta) \
20         (parse_rtattr((tb), (max), RTA_DATA(rta), RTA_PAYLOAD(rta)))
21
22 /* nullifies tb on error */
23 #define __parse_rtattr_nested_compat(tb, max, rta, len) \
24         ({if ((RTA_PAYLOAD(rta) >= len) && \
25                  (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr))) { \
26                         rta = RTA_DATA(rta) + RTA_ALIGN(len); \
27                         parse_rtattr_nested(tb, max, rta); \
28           } else \
29                         memset(tb, 0, sizeof(struct rtattr *) * (max + 1)); \
30         })
31
32 #define parse_rtattr_nested_compat(tb, max, rta, data, len) \
33         ({data = RTA_PAYLOAD(rta) >= len ? RTA_DATA(rta) : NULL; \
34         __parse_rtattr_nested_compat(tb, max, rta, len); })
35
36 #define show_details (0) /* not implemented. Does anyone need it? */
37 #define use_iec (0) /* not currently documented in the upstream manpage */
38
39
40 struct globals {
41         int filter_ifindex;
42         __u32 filter_qdisc;
43         __u32 filter_parent;
44         __u32 filter_prio;
45         __u32 filter_proto;
46 };
47
48 #define G (*(struct globals*)&bb_common_bufsiz1)
49 #define filter_ifindex (G.filter_ifindex)
50 #define filter_qdisc (G.filter_qdisc)
51 #define filter_parent (G.filter_parent)
52 #define filter_prio (G.filter_prio)
53 #define filter_proto (G.filter_proto)
54
55 void BUG_tc_globals_too_big(void);
56 #define INIT_G() do { \
57         if (sizeof(G) > COMMON_BUFSIZE) \
58                 BUG_tc_globals_too_big(); \
59 } while (0)
60
61 /* Allocates a buffer containing the name of a class id.
62  * The caller must free the returned memory.  */
63 static char* print_tc_classid(uint32_t cid)
64 {
65 #if 0 /* IMPOSSIBLE */
66         if (cid == TC_H_ROOT)
67                 return xasprintf("root");
68         else
69 #endif
70         if (cid == TC_H_UNSPEC)
71                 return xasprintf("none");
72         else if (TC_H_MAJ(cid) == 0)
73                 return xasprintf(":%x", TC_H_MIN(cid));
74         else if (TC_H_MIN(cid) == 0)
75                 return xasprintf("%x:", TC_H_MAJ(cid)>>16);
76         else
77                 return xasprintf("%x:%x", TC_H_MAJ(cid)>>16, TC_H_MIN(cid));
78 }
79
80 /* Get a qdisc handle.  Return 0 on success, !0 otherwise.  */
81 static int get_qdisc_handle(__u32 *h, const char *str) {
82         __u32 maj;
83         char *p;
84
85         maj = TC_H_UNSPEC;
86         if (!strcmp(str, "none"))
87                 goto ok;
88         maj = strtoul(str, &p, 16);
89         if (p == str)
90                 return 1;
91         maj <<= 16;
92         if (*p != ':' && *p!=0)
93                 return 1;
94  ok:
95         *h = maj;
96         return 0;
97 }
98
99 /* Get class ID.  Return 0 on success, !0 otherwise.  */
100 static int get_tc_classid(__u32 *h, const char *str) {
101         __u32 maj, min;
102         char *p;
103
104         maj = TC_H_ROOT;
105         if (!strcmp(str, "root"))
106                 goto ok;
107         maj = TC_H_UNSPEC;
108         if (!strcmp(str, "none"))
109                 goto ok;
110         maj = strtoul(str, &p, 16);
111         if (p == str) {
112                 if (*p != ':')
113                         return 1;
114                 maj = 0;
115         }
116         if (*p == ':') {
117                 if (maj >= (1<<16))
118                         return 1;
119                 maj <<= 16;
120                 str = p + 1;
121                 min = strtoul(str, &p, 16);
122                 if (*p != 0 || min >= (1<<16))
123                         return 1;
124                 maj |= min;
125         } else if (*p != 0)
126                 return 1;
127  ok:
128         *h = maj;
129         return 0;
130 }
131
132 static void print_rate(char *buf, int len, uint32_t rate)
133 {
134         double tmp = (double)rate*8;
135
136         if (use_iec) {
137                 if (tmp >= 1000.0*1024.0*1024.0)
138                         snprintf(buf, len, "%.0fMibit", tmp/1024.0*1024.0);
139                 else if (tmp >= 1000.0*1024)
140                         snprintf(buf, len, "%.0fKibit", tmp/1024);
141                 else
142                         snprintf(buf, len, "%.0fbit", tmp);
143         } else {
144                 if (tmp >= 1000.0*1000000.0)
145                         snprintf(buf, len, "%.0fMbit", tmp/1000000.0);
146                 else if (tmp >= 1000.0 * 1000.0)
147                         snprintf(buf, len, "%.0fKbit", tmp/1000.0);
148                 else
149                         snprintf(buf, len, "%.0fbit",  tmp);
150         }
151 }
152
153 /* This is "pfifo_fast".  */
154 static int prio_parse_opt(int argc, char **argv, struct nlmsghdr *n)
155 {
156         return 0;
157 }
158 static int prio_print_opt(struct rtattr *opt)
159 {
160         int i;
161         struct tc_prio_qopt *qopt;
162         struct rtattr *tb[TCA_PRIO_MAX+1];
163
164         if (opt == NULL)
165                 return 0;
166         parse_rtattr_nested_compat(tb, TCA_PRIO_MAX, opt, qopt, sizeof(*qopt));
167         if (tb == NULL)
168                 return 0;
169         printf("bands %u priomap ", qopt->bands);
170         for (i=0; i<=TC_PRIO_MAX; i++)
171                 printf(" %d", qopt->priomap[i]);
172
173         if (tb[TCA_PRIO_MQ])
174                 printf(" multiqueue: o%s ",
175                     *(unsigned char *)RTA_DATA(tb[TCA_PRIO_MQ]) ? "n" : "ff");
176
177         return 0;
178 }
179
180 /* Class Based Queue */
181 static int cbq_parse_opt(int argc, char **argv, struct nlmsghdr *n)
182 {
183         return 0;
184 }
185 static int cbq_print_opt(struct rtattr *opt)
186 {
187         struct rtattr *tb[TCA_CBQ_MAX+1];
188         struct tc_ratespec *r = NULL;
189         struct tc_cbq_lssopt *lss = NULL;
190         struct tc_cbq_wrropt *wrr = NULL;
191         struct tc_cbq_fopt *fopt = NULL;
192         struct tc_cbq_ovl *ovl = NULL;
193         const char * const error = "CBQ: too short %s opt";
194         RESERVE_CONFIG_BUFFER(buf, 64);
195
196         if (opt == NULL)
197                 goto done;
198         parse_rtattr_nested(tb, TCA_CBQ_MAX, opt);
199
200         if (tb[TCA_CBQ_RATE]) {
201                 if (RTA_PAYLOAD(tb[TCA_CBQ_RATE]) < sizeof(*r))
202                         bb_error_msg(error, "rate");
203                 else
204                         r = RTA_DATA(tb[TCA_CBQ_RATE]);
205         }
206         if (tb[TCA_CBQ_LSSOPT]) {
207                 if (RTA_PAYLOAD(tb[TCA_CBQ_LSSOPT]) < sizeof(*lss))
208                         bb_error_msg(error, "lss");
209                 else
210                         lss = RTA_DATA(tb[TCA_CBQ_LSSOPT]);
211         }
212         if (tb[TCA_CBQ_WRROPT]) {
213                 if (RTA_PAYLOAD(tb[TCA_CBQ_WRROPT]) < sizeof(*wrr))
214                         bb_error_msg(error, "wrr");
215                 else
216                         wrr = RTA_DATA(tb[TCA_CBQ_WRROPT]);
217         }
218         if (tb[TCA_CBQ_FOPT]) {
219                 if (RTA_PAYLOAD(tb[TCA_CBQ_FOPT]) < sizeof(*fopt))
220                         bb_error_msg(error, "fopt");
221                 else
222                         fopt = RTA_DATA(tb[TCA_CBQ_FOPT]);
223         }
224         if (tb[TCA_CBQ_OVL_STRATEGY]) {
225                 if (RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]) < sizeof(*ovl))
226                         bb_error_msg("CBQ: too short overlimit strategy %u/%u",
227                                 (unsigned) RTA_PAYLOAD(tb[TCA_CBQ_OVL_STRATEGY]),
228                                 (unsigned) sizeof(*ovl));
229                 else
230                         ovl = RTA_DATA(tb[TCA_CBQ_OVL_STRATEGY]);
231         }
232
233         if (r) {
234                 print_rate(buf, sizeof(buf), r->rate);
235                 printf("rate %s ", buf);
236                 if (show_details) {
237                         printf("cell %ub ", 1<<r->cell_log);
238                         if (r->mpu)
239                                 printf("mpu %ub ", r->mpu);
240                         if (r->overhead)
241                                 printf("overhead %ub ", r->overhead);
242                 }
243         }
244         if (lss && lss->flags) {
245                 bool comma = false;
246                 bb_putchar('(');
247                 if (lss->flags&TCF_CBQ_LSS_BOUNDED) {
248                         printf("bounded");
249                         comma = true;
250                 }
251                 if (lss->flags&TCF_CBQ_LSS_ISOLATED) {
252                         if (comma)
253                                 bb_putchar(',');
254                         printf("isolated");
255                 }
256                 printf(") ");
257         }
258         if (wrr) {
259                 if (wrr->priority != TC_CBQ_MAXPRIO)
260                         printf("prio %u", wrr->priority);
261                 else
262                         printf("prio no-transmit");
263                 if (show_details) {
264                         printf("/%u ", wrr->cpriority);
265                         if (wrr->weight != 1) {
266                                 print_rate(buf, sizeof(buf), wrr->weight);
267                                 printf("weight %s ", buf);
268                         }
269                         if (wrr->allot)
270                                 printf("allot %ub ", wrr->allot);
271                 }
272         }
273  done:
274         RELEASE_CONFIG_BUFFER(buf);
275         return 0;
276 }
277
278 static int print_qdisc(const struct sockaddr_nl *who UNUSED_PARAM,
279                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
280 {
281         struct tcmsg *msg = NLMSG_DATA(hdr);
282         int len = hdr->nlmsg_len;
283         struct rtattr * tb[TCA_MAX+1];
284         char *name;
285
286         if (hdr->nlmsg_type != RTM_NEWQDISC && hdr->nlmsg_type != RTM_DELQDISC) {
287                 /* bb_error_msg("Not a qdisc"); */
288                 return 0; /* ??? mimic upstream; should perhaps return -1 */
289         }
290         len -= NLMSG_LENGTH(sizeof(*msg));
291         if (len < 0) {
292                 /* bb_error_msg("Wrong len %d", len); */
293                 return -1;
294         }
295         /* not the desired interface? */
296         if (filter_ifindex && filter_ifindex != msg->tcm_ifindex)
297                 return 0;
298         memset (tb, 0, sizeof(tb));
299         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
300         if (tb[TCA_KIND] == NULL) {
301                 /* bb_error_msg("%s: NULL kind", "qdisc"); */
302                 return -1;
303         }
304         if (hdr->nlmsg_type == RTM_DELQDISC)
305                 printf("deleted ");
306         name = (char*)RTA_DATA(tb[TCA_KIND]);
307         printf("qdisc %s %x: ", name, msg->tcm_handle>>16);
308         if (filter_ifindex == 0)
309                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
310         if (msg->tcm_parent == TC_H_ROOT)
311                 printf("root ");
312         else if (msg->tcm_parent) {
313                 char *classid = print_tc_classid(msg->tcm_parent);
314                 printf("parent %s ", classid);
315                 if (ENABLE_FEATURE_CLEAN_UP)
316                         free(classid);
317         }
318         if (msg->tcm_info != 1)
319                 printf("refcnt %d ", msg->tcm_info);
320         if (tb[TCA_OPTIONS]) {
321                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
322                 int qqq = index_in_strings(_q_, name);
323                 if (qqq == 0) { /* pfifo_fast aka prio */
324                         prio_print_opt(tb[TCA_OPTIONS]);
325                 } else if (qqq == 1) { /* class based queueing */
326                         cbq_print_opt(tb[TCA_OPTIONS]);
327                 } else
328                         bb_error_msg("unknown %s", name);
329         }
330         bb_putchar('\n');
331         return 0;
332 }
333
334 static int print_class(const struct sockaddr_nl *who UNUSED_PARAM,
335                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
336 {
337         struct tcmsg *msg = NLMSG_DATA(hdr);
338         int len = hdr->nlmsg_len;
339         struct rtattr * tb[TCA_MAX+1];
340         char *name, *classid;
341
342         /*XXX Eventually factor out common code */
343
344         if (hdr->nlmsg_type != RTM_NEWTCLASS && hdr->nlmsg_type != RTM_DELTCLASS) {
345                 /* bb_error_msg("Not a class"); */
346                 return 0; /* ??? mimic upstream; should perhaps return -1 */
347         }
348         len -= NLMSG_LENGTH(sizeof(*msg));
349         if (len < 0) {
350                 /* bb_error_msg("Wrong len %d", len); */
351                 return -1;
352         }
353         /* not the desired interface? */
354         if (filter_qdisc && TC_H_MAJ(msg->tcm_handle^filter_qdisc))
355                 return 0;
356         memset (tb, 0, sizeof(tb));
357         parse_rtattr(tb, TCA_MAX, TCA_RTA(msg), len);
358         if (tb[TCA_KIND] == NULL) {
359                 /* bb_error_msg("%s: NULL kind", "class"); */
360                 return -1;
361         }
362         if (hdr->nlmsg_type == RTM_DELTCLASS)
363                 printf("deleted ");
364
365         name = (char*)RTA_DATA(tb[TCA_KIND]);
366         classid = !msg->tcm_handle ? NULL : print_tc_classid(
367                                 filter_qdisc ? TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
368         printf ("class %s %s", name, classid);
369         if (ENABLE_FEATURE_CLEAN_UP)
370                 free(classid);
371
372         if (filter_ifindex == 0)
373                 printf("dev %s ", ll_index_to_name(msg->tcm_ifindex));
374         if (msg->tcm_parent == TC_H_ROOT)
375                 printf("root ");
376         else if (msg->tcm_parent) {
377                 classid = print_tc_classid(filter_qdisc ?
378                                                                    TC_H_MIN(msg->tcm_parent) : msg->tcm_parent);
379                 printf("parent %s ", classid);
380                 if (ENABLE_FEATURE_CLEAN_UP)
381                         free(classid);
382         }
383         if (msg->tcm_info)
384                 printf("leaf %x ", msg->tcm_info >> 16);
385         /* Do that get_qdisc_kind(RTA_DATA(tb[TCA_KIND])).  */
386         if (tb[TCA_OPTIONS]) {
387                 static const char _q_[] ALIGN1 = "pfifo_fast\0""cbq\0";
388                 int qqq = index_in_strings(_q_, name);
389                 if (qqq == 0) { /* pfifo_fast aka prio */
390                         /* nothing. */ /*prio_print_opt(tb[TCA_OPTIONS]);*/
391                 } else if (qqq == 1) { /* class based queueing */
392                         /* cbq_print_copt() is identical to cbq_print_opt(). */
393                         cbq_print_opt(tb[TCA_OPTIONS]);
394                 } else
395                         bb_error_msg("unknown %s", name);
396         }
397         bb_putchar('\n');
398
399         return 0;
400 }
401
402 static int print_filter(const struct sockaddr_nl *who UNUSED_PARAM,
403                                                 struct nlmsghdr *hdr, void *arg UNUSED_PARAM)
404 {
405         struct tcmsg *msg = NLMSG_DATA(hdr);
406         int len = hdr->nlmsg_len;
407         struct rtattr * tb[TCA_MAX+1];
408         return 0;
409 }
410
411 int tc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
412 int tc_main(int argc UNUSED_PARAM, char **argv)
413 {
414         static const char objects[] ALIGN1 =
415                 "qdisc\0""class\0""filter\0"
416                 ;
417         enum { OBJ_qdisc = 0, OBJ_class, OBJ_filter };
418         static const char commands[] ALIGN1 =
419                 "add\0""delete\0""change\0"
420                 "link\0" /* only qdisc */
421                 "replace\0"
422                 "show\0""list\0"
423                 ;
424         static const char args[] ALIGN1 =
425                 "dev\0" /* qdisc, class, filter */
426                 "root\0" /* class, filter */
427                 "parent\0" /* class, filter */
428                 "qdisc\0" /* class */
429                 "handle\0" /* change: qdisc, class(classid) list: filter */
430                 "classid\0" /* change: for class use "handle" */
431                 "preference\0""priority\0""protocol\0" /* filter */
432                 ;
433         enum { CMD_add = 0, CMD_del, CMD_change, CMD_link, CMD_replace, CMD_show };
434         enum { ARG_dev = 0, ARG_root, ARG_parent, ARG_qdisc,
435                         ARG_handle, ARG_classid, ARG_pref, ARG_prio, ARG_proto};
436         struct rtnl_handle rth;
437         struct tcmsg msg;
438         int ret, obj, cmd, arg;
439         char *dev = NULL;
440
441         INIT_G();
442
443         if (!*++argv)
444                 bb_show_usage();
445         xrtnl_open(&rth);
446         ret = EXIT_SUCCESS;
447
448         obj = index_in_substrings(objects, *argv++);
449
450         if (obj < OBJ_qdisc)
451                 bb_show_usage();
452         if (!*argv)
453                 cmd = CMD_show; /* list is the default */
454         else {
455                 cmd = index_in_substrings(commands, *argv);
456                 if (cmd < 0)
457                         bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
458                 argv++;
459         }
460         memset(&msg, 0, sizeof(msg));
461         msg.tcm_family = AF_UNSPEC;
462         ll_init_map(&rth);
463         while (*argv) {
464                 arg = index_in_substrings(args, *argv);
465                 if (arg == ARG_dev) {
466                         NEXT_ARG();
467                         if (dev)
468                                 duparg2("dev", *argv);
469                         dev = *argv++;
470                         msg.tcm_ifindex = xll_name_to_index(dev);
471                         if (cmd >= CMD_show)
472                                 filter_ifindex = msg.tcm_ifindex;
473                 } else if ((arg == ARG_qdisc && obj == OBJ_class && cmd >= CMD_show)
474                                    || (arg == ARG_handle && obj == OBJ_qdisc
475                                            && cmd == CMD_change)) {
476                         NEXT_ARG();
477                         /* We don't care about duparg2("qdisc handle",*argv) for now */
478                         if (get_qdisc_handle(&filter_qdisc, *argv))
479                                 invarg(*argv, "qdisc");
480                 } else if (obj != OBJ_qdisc &&
481                                    (arg == ARG_root
482                                          || arg == ARG_parent
483                                          || (obj == OBJ_filter && arg >= ARG_pref))) {
484                 } else {
485                         invarg(*argv, "command");
486                 }
487                 NEXT_ARG();
488                 if (arg == ARG_root) {
489                         if (msg.tcm_parent)
490                                 duparg("parent", *argv);
491                         msg.tcm_parent = TC_H_ROOT;
492                         if (obj == OBJ_filter)
493                                 filter_parent = TC_H_ROOT;
494                 } else if (arg == ARG_parent) {
495                         __u32 handle;
496                         if (msg.tcm_parent)
497                                 duparg(*argv, "parent");
498                         if (get_tc_classid(&handle, *argv))
499                                 invarg(*argv, "parent");
500                         msg.tcm_parent = handle;
501                         if (obj == OBJ_filter)
502                                 filter_parent = handle;
503                 } else if (arg == ARG_handle) { /* filter::list */
504                         if (msg.tcm_handle)
505                                 duparg(*argv, "handle");
506                         /* reject LONG_MIN || LONG_MAX */
507                         /* TODO: for fw
508                            if ((slash = strchr(handle, '/')) != NULL)
509                                    *slash = '\0';
510                          */
511                         msg.tcm_handle = get_u32(*argv, "handle");
512                         /* if (slash) {if (get_u32(__u32 &mask, slash+1, NULL)) inv mask; addattr32(n, MAX_MSG, TCA_FW_MASK, mask); */
513                 } else if (arg == ARG_classid && obj == OBJ_class && cmd == CMD_change){
514                 } else if (arg == ARG_pref || arg == ARG_prio) { /* filter::list */
515                         if (filter_prio)
516                                 duparg(*argv, "priority");
517                         filter_prio = get_u32(*argv, "priority");
518                 } else if (arg == ARG_proto) { /* filter::list */
519                         __u16 tmp;
520                         if (filter_proto)
521                                 duparg(*argv, "protocol");
522                         if (ll_proto_a2n(&tmp, *argv))
523                                 invarg(*argv, "protocol");
524                         filter_proto = tmp;
525                 }
526         }
527         if (cmd >= CMD_show) { /* show or list */
528                 if (obj == OBJ_filter)
529                         msg.tcm_info = TC_H_MAKE(filter_prio<<16, filter_proto);
530                 if (rtnl_dump_request(&rth, obj == OBJ_qdisc ? RTM_GETQDISC :
531                                                 obj == OBJ_class ? RTM_GETTCLASS : RTM_GETTFILTER,
532                                                 &msg, sizeof(msg)) < 0)
533                         bb_simple_perror_msg_and_die("cannot send dump request");
534
535                 xrtnl_dump_filter(&rth, obj == OBJ_qdisc ? print_qdisc :
536                                                 obj == OBJ_class ? print_class : print_filter,
537                                                 NULL);
538         }
539         if (ENABLE_FEATURE_CLEAN_UP) {
540                 rtnl_close(&rth);
541         }
542         return ret;
543 }