1
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <time.h>
6 #include <sys/socket.h>
7 #include <sys/time.h>
8 #include <netinet/in.h>
9 #include <linux/if.h>
10 #include <linux/if_bridge.h>
11 #include <string.h>
12 #include <stdbool.h>
13
14 #include "libnetlink.h"
15 #include "utils.h"
16 #include "br_common.h"
17
18 static unsigned int filter_index;
19
20 static const char *port_states[] = {
21 [BR_STATE_DISABLED] = "disabled",
22 [BR_STATE_LISTENING] = "listening",
23 [BR_STATE_LEARNING] = "learning",
24 [BR_STATE_FORWARDING] = "forwarding",
25 [BR_STATE_BLOCKING] = "blocking",
26 };
27
28 extern char *if_indextoname(unsigned int __ifindex, char *__ifname);
29
print_link_flags(FILE * fp,unsigned int flags)30 static void print_link_flags(FILE *fp, unsigned int flags)
31 {
32 fprintf(fp, "<");
33 if (flags & IFF_UP && !(flags & IFF_RUNNING))
34 fprintf(fp, "NO-CARRIER%s", flags ? "," : "");
35 flags &= ~IFF_RUNNING;
36 #define _PF(f) if (flags&IFF_##f) { \
37 flags &= ~IFF_##f ; \
38 fprintf(fp, #f "%s", flags ? "," : ""); }
39 _PF(LOOPBACK);
40 _PF(BROADCAST);
41 _PF(POINTOPOINT);
42 _PF(MULTICAST);
43 _PF(NOARP);
44 _PF(ALLMULTI);
45 _PF(PROMISC);
46 _PF(MASTER);
47 _PF(SLAVE);
48 _PF(DEBUG);
49 _PF(DYNAMIC);
50 _PF(AUTOMEDIA);
51 _PF(PORTSEL);
52 _PF(NOTRAILERS);
53 _PF(UP);
54 _PF(LOWER_UP);
55 _PF(DORMANT);
56 _PF(ECHO);
57 #undef _PF
58 if (flags)
59 fprintf(fp, "%x", flags);
60 fprintf(fp, "> ");
61 }
62
63 static const char *oper_states[] = {
64 "UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
65 "TESTING", "DORMANT", "UP"
66 };
67
68 static const char *hw_mode[] = {"VEB", "VEPA"};
69
print_operstate(FILE * f,__u8 state)70 static void print_operstate(FILE *f, __u8 state)
71 {
72 if (state >= ARRAY_SIZE(oper_states))
73 fprintf(f, "state %#x ", state);
74 else
75 fprintf(f, "state %s ", oper_states[state]);
76 }
77
print_portstate(FILE * f,__u8 state)78 static void print_portstate(FILE *f, __u8 state)
79 {
80 if (state <= BR_STATE_BLOCKING)
81 fprintf(f, "state %s ", port_states[state]);
82 else
83 fprintf(f, "state (%d) ", state);
84 }
85
print_onoff(FILE * f,char * flag,__u8 val)86 static void print_onoff(FILE *f, char *flag, __u8 val)
87 {
88 fprintf(f, "%s %s ", flag, val ? "on" : "off");
89 }
90
print_hwmode(FILE * f,__u16 mode)91 static void print_hwmode(FILE *f, __u16 mode)
92 {
93 if (mode >= ARRAY_SIZE(hw_mode))
94 fprintf(f, "hwmode %#hx ", mode);
95 else
96 fprintf(f, "hwmode %s ", hw_mode[mode]);
97 }
98
print_linkinfo(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)99 int print_linkinfo(const struct sockaddr_nl *who,
100 struct nlmsghdr *n, void *arg)
101 {
102 FILE *fp = arg;
103 int len = n->nlmsg_len;
104 struct ifinfomsg *ifi = NLMSG_DATA(n);
105 struct rtattr *tb[IFLA_MAX+1];
106 char b1[IFNAMSIZ];
107
108 len -= NLMSG_LENGTH(sizeof(*ifi));
109 if (len < 0) {
110 fprintf(stderr, "Message too short!\n");
111 return -1;
112 }
113
114 if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
115 return 0;
116
117 if (filter_index && filter_index != ifi->ifi_index)
118 return 0;
119
120 parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
121
122 if (tb[IFLA_IFNAME] == NULL) {
123 fprintf(stderr, "BUG: nil ifname\n");
124 return -1;
125 }
126
127 if (n->nlmsg_type == RTM_DELLINK)
128 fprintf(fp, "Deleted ");
129
130 fprintf(fp, "%d: %s ", ifi->ifi_index,
131 tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
132
133 if (tb[IFLA_OPERSTATE])
134 print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));
135
136 if (tb[IFLA_LINK]) {
137 SPRINT_BUF(b1);
138 int iflink = rta_getattr_u32(tb[IFLA_LINK]);
139
140 if (iflink == 0)
141 fprintf(fp, "@NONE: ");
142 else
143 fprintf(fp, "@%s: ",
144 if_indextoname(iflink, b1));
145 } else
146 fprintf(fp, ": ");
147
148 print_link_flags(fp, ifi->ifi_flags);
149
150 if (tb[IFLA_MTU])
151 fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
152
153 if (tb[IFLA_MASTER])
154 fprintf(fp, "master %s ",
155 if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));
156
157 if (tb[IFLA_PROTINFO]) {
158 if (tb[IFLA_PROTINFO]->rta_type & NLA_F_NESTED) {
159 struct rtattr *prtb[IFLA_BRPORT_MAX+1];
160
161 parse_rtattr_nested(prtb, IFLA_BRPORT_MAX,
162 tb[IFLA_PROTINFO]);
163
164 if (prtb[IFLA_BRPORT_STATE])
165 print_portstate(fp,
166 rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
167 if (prtb[IFLA_BRPORT_PRIORITY])
168 fprintf(fp, "priority %hu ",
169 rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
170 if (prtb[IFLA_BRPORT_COST])
171 fprintf(fp, "cost %u ",
172 rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
173
174 if (show_details) {
175 fprintf(fp, "%s ", _SL_);
176
177 if (prtb[IFLA_BRPORT_MODE])
178 print_onoff(fp, "hairpin",
179 rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
180 if (prtb[IFLA_BRPORT_GUARD])
181 print_onoff(fp, "guard",
182 rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
183 if (prtb[IFLA_BRPORT_PROTECT])
184 print_onoff(fp, "root_block",
185 rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
186 if (prtb[IFLA_BRPORT_FAST_LEAVE])
187 print_onoff(fp, "fastleave",
188 rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
189 if (prtb[IFLA_BRPORT_LEARNING])
190 print_onoff(fp, "learning",
191 rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
192 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
193 print_onoff(fp, "learning_sync",
194 rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
195 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
196 print_onoff(fp, "flood",
197 rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
198 if (prtb[IFLA_BRPORT_MCAST_FLOOD])
199 print_onoff(fp, "mcast_flood",
200 rta_getattr_u8(prtb[IFLA_BRPORT_MCAST_FLOOD]));
201 }
202 } else
203 print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
204 }
205
206 if (tb[IFLA_AF_SPEC]) {
207 /* This is reported by HW devices that have some bridging
208 * capabilities.
209 */
210 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
211
212 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
213
214 if (aftb[IFLA_BRIDGE_MODE])
215 print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
216 if (show_details) {
217 if (aftb[IFLA_BRIDGE_VLAN_INFO]) {
218 fprintf(fp, "\n");
219 print_vlan_info(fp, tb[IFLA_AF_SPEC],
220 ifi->ifi_index);
221 }
222 }
223 }
224
225 fprintf(fp, "\n");
226 fflush(fp);
227 return 0;
228 }
229
usage(void)230 static void usage(void)
231 {
232 fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
233 fprintf(stderr, " [ guard {on | off} ]\n");
234 fprintf(stderr, " [ hairpin {on | off} ]\n");
235 fprintf(stderr, " [ fastleave {on | off} ]\n");
236 fprintf(stderr, " [ root_block {on | off} ]\n");
237 fprintf(stderr, " [ learning {on | off} ]\n");
238 fprintf(stderr, " [ learning_sync {on | off} ]\n");
239 fprintf(stderr, " [ flood {on | off} ]\n");
240 fprintf(stderr, " [ mcast_flood {on | off} ]\n");
241 fprintf(stderr, " [ hwmode {vepa | veb} ]\n");
242 fprintf(stderr, " [ self ] [ master ]\n");
243 fprintf(stderr, " bridge link show [dev DEV]\n");
244 exit(-1);
245 }
246
on_off(char * arg,__s8 * attr,char * val)247 static bool on_off(char *arg, __s8 *attr, char *val)
248 {
249 if (strcmp(val, "on") == 0)
250 *attr = 1;
251 else if (strcmp(val, "off") == 0)
252 *attr = 0;
253 else {
254 fprintf(stderr,
255 "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
256 arg);
257 return false;
258 }
259
260 return true;
261 }
262
brlink_modify(int argc,char ** argv)263 static int brlink_modify(int argc, char **argv)
264 {
265 struct {
266 struct nlmsghdr n;
267 struct ifinfomsg ifm;
268 char buf[512];
269 } req = {
270 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
271 .n.nlmsg_flags = NLM_F_REQUEST,
272 .n.nlmsg_type = RTM_SETLINK,
273 .ifm.ifi_family = PF_BRIDGE,
274 };
275 char *d = NULL;
276 __s8 learning = -1;
277 __s8 learning_sync = -1;
278 __s8 flood = -1;
279 __s8 mcast_flood = -1;
280 __s8 hairpin = -1;
281 __s8 bpdu_guard = -1;
282 __s8 fast_leave = -1;
283 __s8 root_block = -1;
284 __u32 cost = 0;
285 __s16 priority = -1;
286 __s8 state = -1;
287 __s16 mode = -1;
288 __u16 flags = 0;
289 struct rtattr *nest;
290
291 while (argc > 0) {
292 if (strcmp(*argv, "dev") == 0) {
293 NEXT_ARG();
294 d = *argv;
295 } else if (strcmp(*argv, "guard") == 0) {
296 NEXT_ARG();
297 if (!on_off("guard", &bpdu_guard, *argv))
298 return -1;
299 } else if (strcmp(*argv, "hairpin") == 0) {
300 NEXT_ARG();
301 if (!on_off("hairping", &hairpin, *argv))
302 return -1;
303 } else if (strcmp(*argv, "fastleave") == 0) {
304 NEXT_ARG();
305 if (!on_off("fastleave", &fast_leave, *argv))
306 return -1;
307 } else if (strcmp(*argv, "root_block") == 0) {
308 NEXT_ARG();
309 if (!on_off("root_block", &root_block, *argv))
310 return -1;
311 } else if (strcmp(*argv, "learning") == 0) {
312 NEXT_ARG();
313 if (!on_off("learning", &learning, *argv))
314 return -1;
315 } else if (strcmp(*argv, "learning_sync") == 0) {
316 NEXT_ARG();
317 if (!on_off("learning_sync", &learning_sync, *argv))
318 return -1;
319 } else if (strcmp(*argv, "flood") == 0) {
320 NEXT_ARG();
321 if (!on_off("flood", &flood, *argv))
322 return -1;
323 } else if (strcmp(*argv, "mcast_flood") == 0) {
324 NEXT_ARG();
325 if (!on_off("mcast_flood", &mcast_flood, *argv))
326 return -1;
327 } else if (strcmp(*argv, "cost") == 0) {
328 NEXT_ARG();
329 cost = atoi(*argv);
330 } else if (strcmp(*argv, "priority") == 0) {
331 NEXT_ARG();
332 priority = atoi(*argv);
333 } else if (strcmp(*argv, "state") == 0) {
334 NEXT_ARG();
335 char *endptr;
336 size_t nstates = ARRAY_SIZE(port_states);
337
338 state = strtol(*argv, &endptr, 10);
339 if (!(**argv != '\0' && *endptr == '\0')) {
340 for (state = 0; state < nstates; state++)
341 if (strcmp(port_states[state], *argv) == 0)
342 break;
343 if (state == nstates) {
344 fprintf(stderr,
345 "Error: invalid STP port state\n");
346 return -1;
347 }
348 }
349 } else if (strcmp(*argv, "hwmode") == 0) {
350 NEXT_ARG();
351 flags = BRIDGE_FLAGS_SELF;
352 if (strcmp(*argv, "vepa") == 0)
353 mode = BRIDGE_MODE_VEPA;
354 else if (strcmp(*argv, "veb") == 0)
355 mode = BRIDGE_MODE_VEB;
356 else {
357 fprintf(stderr,
358 "Mode argument must be \"vepa\" or \"veb\".\n");
359 return -1;
360 }
361 } else if (strcmp(*argv, "self") == 0) {
362 flags |= BRIDGE_FLAGS_SELF;
363 } else if (strcmp(*argv, "master") == 0) {
364 flags |= BRIDGE_FLAGS_MASTER;
365 } else {
366 usage();
367 }
368 argc--; argv++;
369 }
370 if (d == NULL) {
371 fprintf(stderr, "Device is a required argument.\n");
372 return -1;
373 }
374
375
376 req.ifm.ifi_index = ll_name_to_index(d);
377 if (req.ifm.ifi_index == 0) {
378 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
379 return -1;
380 }
381
382 /* Nested PROTINFO attribute. Contains: port flags, cost, priority and
383 * state.
384 */
385 nest = addattr_nest(&req.n, sizeof(req),
386 IFLA_PROTINFO | NLA_F_NESTED);
387 /* Flags first */
388 if (bpdu_guard >= 0)
389 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
390 if (hairpin >= 0)
391 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
392 if (fast_leave >= 0)
393 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
394 fast_leave);
395 if (root_block >= 0)
396 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
397 if (flood >= 0)
398 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
399 if (mcast_flood >= 0)
400 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MCAST_FLOOD,
401 mcast_flood);
402 if (learning >= 0)
403 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
404 if (learning_sync >= 0)
405 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
406 learning_sync);
407
408 if (cost > 0)
409 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
410
411 if (priority >= 0)
412 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
413
414 if (state >= 0)
415 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
416
417 addattr_nest_end(&req.n, nest);
418
419 /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
420 * designates master or self operation and IFLA_BRIDGE_MODE
421 * for hw 'vepa' or 'veb' operation modes. The hwmodes are
422 * only valid in 'self' mode on some devices so far.
423 */
424 if (mode >= 0 || flags > 0) {
425 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
426
427 if (flags > 0)
428 addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
429
430 if (mode >= 0)
431 addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
432
433 addattr_nest_end(&req.n, nest);
434 }
435
436 if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
437 return -1;
438
439 return 0;
440 }
441
brlink_show(int argc,char ** argv)442 static int brlink_show(int argc, char **argv)
443 {
444 char *filter_dev = NULL;
445
446 while (argc > 0) {
447 if (strcmp(*argv, "dev") == 0) {
448 NEXT_ARG();
449 if (filter_dev)
450 duparg("dev", *argv);
451 filter_dev = *argv;
452 }
453 argc--; argv++;
454 }
455
456 if (filter_dev) {
457 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
458 fprintf(stderr, "Cannot find device \"%s\"\n",
459 filter_dev);
460 return -1;
461 }
462 }
463
464 if (show_details) {
465 if (rtnl_wilddump_req_filter(&rth, PF_BRIDGE, RTM_GETLINK,
466 (compress_vlans ?
467 RTEXT_FILTER_BRVLAN_COMPRESSED :
468 RTEXT_FILTER_BRVLAN)) < 0) {
469 perror("Cannon send dump request");
470 exit(1);
471 }
472 } else {
473 if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
474 perror("Cannon send dump request");
475 exit(1);
476 }
477 }
478
479 if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
480 fprintf(stderr, "Dump terminated\n");
481 exit(1);
482 }
483 return 0;
484 }
485
do_link(int argc,char ** argv)486 int do_link(int argc, char **argv)
487 {
488 ll_init_map(&rth);
489 if (argc > 0) {
490 if (matches(*argv, "set") == 0 ||
491 matches(*argv, "change") == 0)
492 return brlink_modify(argc-1, argv+1);
493 if (matches(*argv, "show") == 0 ||
494 matches(*argv, "lst") == 0 ||
495 matches(*argv, "list") == 0)
496 return brlink_show(argc-1, argv+1);
497 if (matches(*argv, "help") == 0)
498 usage();
499 } else
500 return brlink_show(0, NULL);
501
502 fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
503 exit(-1);
504 }
505