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
18static unsigned int filter_index;
19
20static 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
28extern char *if_indextoname (unsigned int __ifindex, char *__ifname);
29
30static 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
63static const char *oper_states[] = {
64	"UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
65	"TESTING", "DORMANT",	 "UP"
66};
67
68static const char *hw_mode[] = {"VEB", "VEPA"};
69
70static 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
78static 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
86static void print_onoff(FILE *f, char *flag, __u8 val)
87{
88	fprintf(f, "%s %s ", flag, val ? "on" : "off");
89}
90
91static 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
99int 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
219static 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
235static 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
251static 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
424static 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
458int 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