mdb.c revision 6aac8617139a96a124d63aeae843b73c38f88fc5 
1/*
2 * Get mdb table with netlink
3 */
4
5#include <stdio.h>
6#include <stdlib.h>
7#include <unistd.h>
8#include <fcntl.h>
9#include <sys/socket.h>
10#include <net/if.h>
11#include <netinet/in.h>
12#include <linux/if_bridge.h>
13#include <linux/if_ether.h>
14#include <string.h>
15#include <arpa/inet.h>
16
17#include "libnetlink.h"
18#include "br_common.h"
19#include "rt_names.h"
20#include "utils.h"
21
22#ifndef MDBA_RTA
23#define MDBA_RTA(r) \
24	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct br_port_msg))))
25#endif
26
27static unsigned int filter_index;
28
29static void usage(void)
30{
31	fprintf(stderr, "Usage: bridge mdb { add | del } dev DEV port PORT grp GROUP [permanent | temp] [vid VID]\n");
32	fprintf(stderr, "       bridge mdb {show} [ dev DEV ]\n");
33	exit(-1);
34}
35
36static void br_print_router_ports(FILE *f, struct rtattr *attr)
37{
38	uint32_t *port_ifindex;
39	struct rtattr *i;
40	int rem;
41
42	rem = RTA_PAYLOAD(attr);
43	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
44		port_ifindex = RTA_DATA(i);
45		fprintf(f, "%s ", ll_index_to_name(*port_ifindex));
46	}
47
48	fprintf(f, "\n");
49}
50
51static void print_mdb_entry(FILE *f, int ifindex, struct br_mdb_entry *e)
52{
53	SPRINT_BUF(abuf);
54	const void *src;
55	int af;
56
57	af = e->addr.proto == htons(ETH_P_IP) ? AF_INET : AF_INET6;
58	src = af == AF_INET ? (const void *)&e->addr.u.ip4 :
59			      (const void *)&e->addr.u.ip6;
60	fprintf(f, "dev %s port %s grp %s %s", ll_index_to_name(ifindex),
61		ll_index_to_name(e->ifindex),
62		inet_ntop(af, src, abuf, sizeof(abuf)),
63		(e->state & MDB_PERMANENT) ? "permanent" : "temp");
64	if (e->vid)
65		fprintf(f, " vid %hu", e->vid);
66	fprintf(f, "\n");
67}
68
69static void br_print_mdb_entry(FILE *f, int ifindex, struct rtattr *attr)
70{
71	struct rtattr *i;
72	int rem;
73	struct br_mdb_entry *e;
74
75	rem = RTA_PAYLOAD(attr);
76	for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
77		e = RTA_DATA(i);
78		print_mdb_entry(f, ifindex, e);
79	}
80}
81
82int print_mdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
83{
84	FILE *fp = arg;
85	struct br_port_msg *r = NLMSG_DATA(n);
86	int len = n->nlmsg_len;
87	struct rtattr *tb[MDBA_MAX+1], *i;
88
89	if (n->nlmsg_type != RTM_GETMDB && n->nlmsg_type != RTM_NEWMDB && n->nlmsg_type != RTM_DELMDB) {
90		fprintf(stderr, "Not RTM_GETMDB, RTM_NEWMDB or RTM_DELMDB: %08x %08x %08x\n",
91			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
92
93		return 0;
94	}
95
96	len -= NLMSG_LENGTH(sizeof(*r));
97	if (len < 0) {
98		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
99		return -1;
100	}
101
102	if (filter_index && filter_index != r->ifindex)
103		return 0;
104
105	parse_rtattr(tb, MDBA_MAX, MDBA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
106
107	if (tb[MDBA_MDB]) {
108		int rem = RTA_PAYLOAD(tb[MDBA_MDB]);
109
110		for (i = RTA_DATA(tb[MDBA_MDB]); RTA_OK(i, rem); i = RTA_NEXT(i, rem))
111			br_print_mdb_entry(fp, r->ifindex, i);
112	}
113
114	if (tb[MDBA_ROUTER]) {
115		if (n->nlmsg_type == RTM_GETMDB) {
116			if (show_details) {
117				fprintf(fp, "router ports on %s: ",
118					ll_index_to_name(r->ifindex));
119				br_print_router_ports(fp, tb[MDBA_ROUTER]);
120			}
121		} else {
122			uint32_t *port_ifindex;
123
124			i = RTA_DATA(tb[MDBA_ROUTER]);
125			port_ifindex = RTA_DATA(i);
126			if (n->nlmsg_type == RTM_DELMDB)
127				fprintf(fp, "Deleted ");
128			fprintf(fp, "router port dev %s master %s\n",
129				ll_index_to_name(*port_ifindex),
130				ll_index_to_name(r->ifindex));
131		}
132	}
133
134	return 0;
135}
136
137static int mdb_show(int argc, char **argv)
138{
139	char *filter_dev = NULL;
140
141	while (argc > 0) {
142		if (strcmp(*argv, "dev") == 0) {
143			NEXT_ARG();
144			if (filter_dev)
145				duparg("dev", *argv);
146			filter_dev = *argv;
147		}
148		argc--; argv++;
149	}
150
151	if (filter_dev) {
152		filter_index = if_nametoindex(filter_dev);
153		if (filter_index == 0) {
154			fprintf(stderr, "Cannot find device \"%s\"\n",
155				filter_dev);
156			return -1;
157		}
158	}
159
160	if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETMDB) < 0) {
161		perror("Cannot send dump request");
162		return -1;
163	}
164
165	if (rtnl_dump_filter(&rth, print_mdb, stdout) < 0) {
166		fprintf(stderr, "Dump terminated\n");
167		return -1;
168	}
169
170	return 0;
171}
172
173static int mdb_modify(int cmd, int flags, int argc, char **argv)
174{
175	struct {
176		struct nlmsghdr 	n;
177		struct br_port_msg	bpm;
178		char   			buf[1024];
179	} req;
180	struct br_mdb_entry entry;
181	char *d = NULL, *p = NULL, *grp = NULL;
182	short vid = 0;
183
184	memset(&req, 0, sizeof(req));
185	memset(&entry, 0, sizeof(entry));
186
187	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg));
188	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
189	req.n.nlmsg_type = cmd;
190	req.bpm.family = PF_BRIDGE;
191
192	while (argc > 0) {
193		if (strcmp(*argv, "dev") == 0) {
194			NEXT_ARG();
195			d = *argv;
196		} else if (strcmp(*argv, "grp") == 0) {
197			NEXT_ARG();
198			grp = *argv;
199		} else if (strcmp(*argv, "port") == 0) {
200			NEXT_ARG();
201			p = *argv;
202		} else if (strcmp(*argv, "permanent") == 0) {
203			if (cmd == RTM_NEWMDB)
204				entry.state |= MDB_PERMANENT;
205		} else if (strcmp(*argv, "temp") == 0) {
206			;/* nothing */
207		} else if (strcmp(*argv, "vid") == 0) {
208			NEXT_ARG();
209			vid = atoi(*argv);
210		} else {
211			if (matches(*argv, "help") == 0)
212				usage();
213		}
214		argc--; argv++;
215	}
216
217	if (d == NULL || grp == NULL || p == NULL) {
218		fprintf(stderr, "Device, group address and port name are required arguments.\n");
219		return -1;
220	}
221
222	req.bpm.ifindex = ll_name_to_index(d);
223	if (req.bpm.ifindex == 0) {
224		fprintf(stderr, "Cannot find device \"%s\"\n", d);
225		return -1;
226	}
227
228	entry.ifindex = ll_name_to_index(p);
229	if (entry.ifindex == 0) {
230		fprintf(stderr, "Cannot find device \"%s\"\n", p);
231		return -1;
232	}
233
234	if (!inet_pton(AF_INET, grp, &entry.addr.u.ip4)) {
235		if (!inet_pton(AF_INET6, grp, &entry.addr.u.ip6)) {
236			fprintf(stderr, "Invalid address \"%s\"\n", grp);
237			return -1;
238		} else
239			entry.addr.proto = htons(ETH_P_IPV6);
240	} else
241		entry.addr.proto = htons(ETH_P_IP);
242
243	entry.vid = vid;
244	addattr_l(&req.n, sizeof(req), MDBA_SET_ENTRY, &entry, sizeof(entry));
245
246	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
247		return -1;
248
249	return 0;
250}
251
252int do_mdb(int argc, char **argv)
253{
254	ll_init_map(&rth);
255
256	if (argc > 0) {
257		if (matches(*argv, "add") == 0)
258			return mdb_modify(RTM_NEWMDB, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
259		if (matches(*argv, "delete") == 0)
260			return mdb_modify(RTM_DELMDB, 0, argc-1, argv+1);
261
262		if (matches(*argv, "show") == 0 ||
263		    matches(*argv, "lst") == 0 ||
264		    matches(*argv, "list") == 0)
265			return mdb_show(argc-1, argv+1);
266		if (matches(*argv, "help") == 0)
267			usage();
268	} else
269		return mdb_show(0, NULL);
270
271	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge mdb help\".\n", *argv);
272	exit(-1);
273}
274