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 flags)30 static void print_link_flags(FILE *fp, unsigned 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 >= sizeof(oper_states)/sizeof(oper_states[0]))
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 >= sizeof(hw_mode)/sizeof(hw_mode[0]))
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 if (iflink == 0)
140 fprintf(fp, "@NONE: ");
141 else
142 fprintf(fp, "@%s: ",
143 if_indextoname(iflink, b1));
144 } else
145 fprintf(fp, ": ");
146
147 print_link_flags(fp, ifi->ifi_flags);
148
149 if (tb[IFLA_MTU])
150 fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
151
152 if (tb[IFLA_MASTER])
153 fprintf(fp, "master %s ",
154 if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));
155
156 if (tb[IFLA_PROTINFO]) {
157 if (tb[IFLA_PROTINFO]->rta_type & NLA_F_NESTED) {
158 struct rtattr *prtb[IFLA_BRPORT_MAX+1];
159
160 parse_rtattr_nested(prtb, IFLA_BRPORT_MAX,
161 tb[IFLA_PROTINFO]);
162
163 if (prtb[IFLA_BRPORT_STATE])
164 print_portstate(fp,
165 rta_getattr_u8(prtb[IFLA_BRPORT_STATE]));
166 if (prtb[IFLA_BRPORT_PRIORITY])
167 fprintf(fp, "priority %hu ",
168 rta_getattr_u16(prtb[IFLA_BRPORT_PRIORITY]));
169 if (prtb[IFLA_BRPORT_COST])
170 fprintf(fp, "cost %u ",
171 rta_getattr_u32(prtb[IFLA_BRPORT_COST]));
172
173 if (show_details) {
174 fprintf(fp, "%s ", _SL_);
175
176 if (prtb[IFLA_BRPORT_MODE])
177 print_onoff(fp, "hairpin",
178 rta_getattr_u8(prtb[IFLA_BRPORT_MODE]));
179 if (prtb[IFLA_BRPORT_GUARD])
180 print_onoff(fp, "guard",
181 rta_getattr_u8(prtb[IFLA_BRPORT_GUARD]));
182 if (prtb[IFLA_BRPORT_PROTECT])
183 print_onoff(fp, "root_block",
184 rta_getattr_u8(prtb[IFLA_BRPORT_PROTECT]));
185 if (prtb[IFLA_BRPORT_FAST_LEAVE])
186 print_onoff(fp, "fastleave",
187 rta_getattr_u8(prtb[IFLA_BRPORT_FAST_LEAVE]));
188 if (prtb[IFLA_BRPORT_LEARNING])
189 print_onoff(fp, "learning",
190 rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING]));
191 if (prtb[IFLA_BRPORT_LEARNING_SYNC])
192 print_onoff(fp, "learning_sync",
193 rta_getattr_u8(prtb[IFLA_BRPORT_LEARNING_SYNC]));
194 if (prtb[IFLA_BRPORT_UNICAST_FLOOD])
195 print_onoff(fp, "flood",
196 rta_getattr_u8(prtb[IFLA_BRPORT_UNICAST_FLOOD]));
197 }
198 } else
199 print_portstate(fp, rta_getattr_u8(tb[IFLA_PROTINFO]));
200 }
201
202 if (tb[IFLA_AF_SPEC]) {
203 /* This is reported by HW devices that have some bridging
204 * capabilities.
205 */
206 struct rtattr *aftb[IFLA_BRIDGE_MAX+1];
207
208 parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
209
210 if (aftb[IFLA_BRIDGE_MODE])
211 print_hwmode(fp, rta_getattr_u16(aftb[IFLA_BRIDGE_MODE]));
212 }
213
214 fprintf(fp, "\n");
215 fflush(fp);
216 return 0;
217 }
218
usage(void)219 static void usage(void)
220 {
221 fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
222 fprintf(stderr, " [ guard {on | off} ]\n");
223 fprintf(stderr, " [ hairpin {on | off} ] \n");
224 fprintf(stderr, " [ fastleave {on | off} ]\n");
225 fprintf(stderr, " [ root_block {on | off} ]\n");
226 fprintf(stderr, " [ learning {on | off} ]\n");
227 fprintf(stderr, " [ learning_sync {on | off} ]\n");
228 fprintf(stderr, " [ flood {on | off} ]\n");
229 fprintf(stderr, " [ hwmode {vepa | veb} ]\n");
230 fprintf(stderr, " [ self ] [ master ]\n");
231 fprintf(stderr, " bridge link show [dev DEV]\n");
232 exit(-1);
233 }
234
on_off(char * arg,__s8 * attr,char * val)235 static bool on_off(char *arg, __s8 *attr, char *val)
236 {
237 if (strcmp(val, "on") == 0)
238 *attr = 1;
239 else if (strcmp(val, "off") == 0)
240 *attr = 0;
241 else {
242 fprintf(stderr,
243 "Error: argument of \"%s\" must be \"on\" or \"off\"\n",
244 arg);
245 return false;
246 }
247
248 return true;
249 }
250
brlink_modify(int argc,char ** argv)251 static int brlink_modify(int argc, char **argv)
252 {
253 struct {
254 struct nlmsghdr n;
255 struct ifinfomsg ifm;
256 char buf[512];
257 } req;
258 char *d = NULL;
259 __s8 learning = -1;
260 __s8 learning_sync = -1;
261 __s8 flood = -1;
262 __s8 hairpin = -1;
263 __s8 bpdu_guard = -1;
264 __s8 fast_leave = -1;
265 __s8 root_block = -1;
266 __u32 cost = 0;
267 __s16 priority = -1;
268 __s8 state = -1;
269 __s16 mode = -1;
270 __u16 flags = 0;
271 struct rtattr *nest;
272
273 memset(&req, 0, sizeof(req));
274
275 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
276 req.n.nlmsg_flags = NLM_F_REQUEST;
277 req.n.nlmsg_type = RTM_SETLINK;
278 req.ifm.ifi_family = PF_BRIDGE;
279
280 while (argc > 0) {
281 if (strcmp(*argv, "dev") == 0) {
282 NEXT_ARG();
283 d = *argv;
284 } else if (strcmp(*argv, "guard") == 0) {
285 NEXT_ARG();
286 if (!on_off("guard", &bpdu_guard, *argv))
287 return -1;
288 } else if (strcmp(*argv, "hairpin") == 0) {
289 NEXT_ARG();
290 if (!on_off("hairping", &hairpin, *argv))
291 return -1;
292 } else if (strcmp(*argv, "fastleave") == 0) {
293 NEXT_ARG();
294 if (!on_off("fastleave", &fast_leave, *argv))
295 return -1;
296 } else if (strcmp(*argv, "root_block") == 0) {
297 NEXT_ARG();
298 if (!on_off("root_block", &root_block, *argv))
299 return -1;
300 } else if (strcmp(*argv, "learning") == 0) {
301 NEXT_ARG();
302 if (!on_off("learning", &learning, *argv))
303 return -1;
304 } else if (strcmp(*argv, "learning_sync") == 0) {
305 NEXT_ARG();
306 if (!on_off("learning_sync", &learning_sync, *argv))
307 return -1;
308 } else if (strcmp(*argv, "flood") == 0) {
309 NEXT_ARG();
310 if (!on_off("flood", &flood, *argv))
311 return -1;
312 } else if (strcmp(*argv, "cost") == 0) {
313 NEXT_ARG();
314 cost = atoi(*argv);
315 } else if (strcmp(*argv, "priority") == 0) {
316 NEXT_ARG();
317 priority = atoi(*argv);
318 } else if (strcmp(*argv, "state") == 0) {
319 NEXT_ARG();
320 char *endptr;
321 size_t nstates = sizeof(port_states) / sizeof(*port_states);
322 state = strtol(*argv, &endptr, 10);
323 if (!(**argv != '\0' && *endptr == '\0')) {
324 for (state = 0; state < nstates; state++)
325 if (strcmp(port_states[state], *argv) == 0)
326 break;
327 if (state == nstates) {
328 fprintf(stderr,
329 "Error: invalid STP port state\n");
330 return -1;
331 }
332 }
333 } else if (strcmp(*argv, "hwmode") == 0) {
334 NEXT_ARG();
335 flags = BRIDGE_FLAGS_SELF;
336 if (strcmp(*argv, "vepa") == 0)
337 mode = BRIDGE_MODE_VEPA;
338 else if (strcmp(*argv, "veb") == 0)
339 mode = BRIDGE_MODE_VEB;
340 else {
341 fprintf(stderr,
342 "Mode argument must be \"vepa\" or "
343 "\"veb\".\n");
344 return -1;
345 }
346 } else if (strcmp(*argv, "self") == 0) {
347 flags |= BRIDGE_FLAGS_SELF;
348 } else if (strcmp(*argv, "master") == 0) {
349 flags |= BRIDGE_FLAGS_MASTER;
350 } else {
351 usage();
352 }
353 argc--; argv++;
354 }
355 if (d == NULL) {
356 fprintf(stderr, "Device is a required argument.\n");
357 return -1;
358 }
359
360
361 req.ifm.ifi_index = ll_name_to_index(d);
362 if (req.ifm.ifi_index == 0) {
363 fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
364 return -1;
365 }
366
367 /* Nested PROTINFO attribute. Contains: port flags, cost, priority and
368 * state.
369 */
370 nest = addattr_nest(&req.n, sizeof(req),
371 IFLA_PROTINFO | NLA_F_NESTED);
372 /* Flags first */
373 if (bpdu_guard >= 0)
374 addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
375 if (hairpin >= 0)
376 addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
377 if (fast_leave >= 0)
378 addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
379 fast_leave);
380 if (root_block >= 0)
381 addattr8(&req.n, sizeof(req), IFLA_BRPORT_PROTECT, root_block);
382 if (flood >= 0)
383 addattr8(&req.n, sizeof(req), IFLA_BRPORT_UNICAST_FLOOD, flood);
384 if (learning >= 0)
385 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING, learning);
386 if (learning_sync >= 0)
387 addattr8(&req.n, sizeof(req), IFLA_BRPORT_LEARNING_SYNC,
388 learning_sync);
389
390 if (cost > 0)
391 addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
392
393 if (priority >= 0)
394 addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
395
396 if (state >= 0)
397 addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
398
399 addattr_nest_end(&req.n, nest);
400
401 /* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
402 * designates master or self operation and IFLA_BRIDGE_MODE
403 * for hw 'vepa' or 'veb' operation modes. The hwmodes are
404 * only valid in 'self' mode on some devices so far.
405 */
406 if (mode >= 0 || flags > 0) {
407 nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
408
409 if (flags > 0)
410 addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
411
412 if (mode >= 0)
413 addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
414
415 addattr_nest_end(&req.n, nest);
416 }
417
418 if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
419 return -1;
420
421 return 0;
422 }
423
brlink_show(int argc,char ** argv)424 static int brlink_show(int argc, char **argv)
425 {
426 char *filter_dev = NULL;
427
428 while (argc > 0) {
429 if (strcmp(*argv, "dev") == 0) {
430 NEXT_ARG();
431 if (filter_dev)
432 duparg("dev", *argv);
433 filter_dev = *argv;
434 }
435 argc--; argv++;
436 }
437
438 if (filter_dev) {
439 if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
440 fprintf(stderr, "Cannot find device \"%s\"\n",
441 filter_dev);
442 return -1;
443 }
444 }
445
446 if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
447 perror("Cannon send dump request");
448 exit(1);
449 }
450
451 if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
452 fprintf(stderr, "Dump terminated\n");
453 exit(1);
454 }
455 return 0;
456 }
457
do_link(int argc,char ** argv)458 int do_link(int argc, char **argv)
459 {
460 ll_init_map(&rth);
461 if (argc > 0) {
462 if (matches(*argv, "set") == 0 ||
463 matches(*argv, "change") == 0)
464 return brlink_modify(argc-1, argv+1);
465 if (matches(*argv, "show") == 0 ||
466 matches(*argv, "lst") == 0 ||
467 matches(*argv, "list") == 0)
468 return brlink_show(argc-1, argv+1);
469 if (matches(*argv, "help") == 0)
470 usage();
471 } else
472 return brlink_show(0, NULL);
473
474 fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
475 exit(-1);
476 }
477