ipaddrlabel.c revision 6579feeac4ccc0f087fa402486b3b2fcbcabc77f 
1/*
2 * ipaddrlabel.c	"ip addrlabel"
3 *
4 * Copyright (C)2007 USAGI/WIDE Project
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 *
20 *
21 * Based on iprule.c.
22 *
23 * Authors:	YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
24 *
25 */
26
27#include <stdio.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <syslog.h>
31#include <fcntl.h>
32#include <sys/socket.h>
33#include <netinet/in.h>
34#include <netinet/ip.h>
35#include <arpa/inet.h>
36#include <string.h>
37#include <linux/types.h>
38#include <linux/if_addrlabel.h>
39
40#include "rt_names.h"
41#include "utils.h"
42#include "ip_common.h"
43
44#define IFAL_RTA(r)	((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))))
45#define IFAL_PAYLOAD(n)	NLMSG_PAYLOAD(n,sizeof(struct ifaddrlblmsg))
46
47extern struct rtnl_handle rth;
48
49static void usage(void) __attribute__((noreturn));
50
51static void usage(void)
52{
53	fprintf(stderr, "Usage: ip addrlabel [ list | add | del | flush ] prefix PREFIX [ dev DEV ] [ label LABEL ]\n");
54	exit(-1);
55}
56
57int print_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
58{
59	FILE *fp = (FILE*)arg;
60	struct ifaddrlblmsg *ifal = NLMSG_DATA(n);
61	int len = n->nlmsg_len;
62	int host_len = -1;
63	struct rtattr *tb[IFAL_MAX+1];
64	char abuf[256];
65
66	if (n->nlmsg_type != RTM_NEWADDRLABEL && n->nlmsg_type != RTM_DELADDRLABEL)
67		return 0;
68
69	len -= NLMSG_LENGTH(sizeof(*ifal));
70	if (len < 0)
71		return -1;
72
73	parse_rtattr(tb, IFAL_MAX, IFAL_RTA(ifal), len);
74
75	if (ifal->ifal_family == AF_INET)
76		host_len = 32;
77	else if (ifal->ifal_family == AF_INET6)
78		host_len = 128;
79
80	if (n->nlmsg_type == RTM_DELADDRLABEL)
81		fprintf(fp, "Deleted ");
82
83	if (tb[IFAL_ADDRESS]) {
84		fprintf(fp, "prefix %s/%u ",
85			format_host(ifal->ifal_family,
86				    RTA_PAYLOAD(tb[IFAL_ADDRESS]),
87				    RTA_DATA(tb[IFAL_ADDRESS]),
88				    abuf, sizeof(abuf)),
89			ifal->ifal_prefixlen);
90	}
91
92	if (ifal->ifal_index)
93		fprintf(fp, "dev %s ", ll_index_to_name(ifal->ifal_index));
94
95	if (tb[IFAL_LABEL] && RTA_PAYLOAD(tb[IFAL_LABEL]) == sizeof(int32_t)) {
96		int32_t label;
97		memcpy(&label, RTA_DATA(tb[IFAL_LABEL]), sizeof(label));
98		fprintf(fp, "label %d ", label);
99	}
100
101	fprintf(fp, "\n");
102	fflush(fp);
103	return 0;
104}
105
106static int ipaddrlabel_list(int argc, char **argv)
107{
108	int af = preferred_family;
109
110	if (af == AF_UNSPEC)
111		af = AF_INET6;
112
113	if (argc > 0) {
114		fprintf(stderr, "\"ip addrlabel show\" does not take any arguments.\n");
115		return -1;
116	}
117
118	if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) {
119		perror("Cannot send dump request");
120		return 1;
121	}
122
123	if (rtnl_dump_filter(&rth, print_addrlabel, stdout, NULL, NULL) < 0) {
124		fprintf(stderr, "Dump terminated\n");
125		return 1;
126	}
127
128	return 0;
129}
130
131
132static int ipaddrlabel_modify(int cmd, int argc, char **argv)
133{
134	struct {
135		struct nlmsghdr 	n;
136		struct ifaddrlblmsg	ifal;
137		char   			buf[1024];
138	} req;
139
140	inet_prefix prefix;
141	uint32_t label = 0xffffffffUL;
142	char *p = NULL;
143	char *l = NULL;
144
145	memset(&req, 0, sizeof(req));
146	memset(&prefix, 0, sizeof(prefix));
147
148	req.n.nlmsg_type = cmd;
149	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg));
150	req.n.nlmsg_flags = NLM_F_REQUEST;
151	req.ifal.ifal_family = preferred_family;
152	req.ifal.ifal_prefixlen = 0;
153	req.ifal.ifal_index = 0;
154
155	if (cmd == RTM_NEWADDRLABEL) {
156		req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
157	}
158
159	while (argc > 0) {
160		if (strcmp(*argv, "prefix") == 0) {
161			NEXT_ARG();
162			p = *argv;
163			get_prefix(&prefix, *argv, preferred_family);
164		} else if (strcmp(*argv, "dev") == 0) {
165			NEXT_ARG();
166			if ((req.ifal.ifal_index = ll_name_to_index(*argv)) == 0)
167				invarg("dev is invalid\n", *argv);
168		} else if (strcmp(*argv, "label") == 0) {
169			NEXT_ARG();
170			l = *argv;
171			if (get_u32(&label, *argv, 0) || label == 0xffffffffUL)
172				invarg("label is invalid\n", *argv);
173		}
174		argc--;
175		argv++;
176	}
177	if (p == NULL) {
178		fprintf(stderr, "Not enough information: \"prefix\" argument is required.\n");
179		return -1;
180	}
181	if (l == NULL) {
182		fprintf(stderr, "Not enough information: \"label\" argument is required.\n");
183		return -1;
184	}
185	addattr32(&req.n, sizeof(req), IFAL_LABEL, label);
186	addattr_l(&req.n, sizeof(req), IFAL_ADDRESS, &prefix.data, prefix.bytelen);
187	req.ifal.ifal_prefixlen = prefix.bitlen;
188
189	if (req.ifal.ifal_family == AF_UNSPEC)
190		req.ifal.ifal_family = AF_INET6;
191
192	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
193		return 2;
194
195	return 0;
196}
197
198
199static int flush_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
200{
201	struct rtnl_handle rth2;
202	struct rtmsg *r = NLMSG_DATA(n);
203	int len = n->nlmsg_len;
204	struct rtattr * tb[IFAL_MAX+1];
205
206	len -= NLMSG_LENGTH(sizeof(*r));
207	if (len < 0)
208		return -1;
209
210	parse_rtattr(tb, IFAL_MAX, RTM_RTA(r), len);
211
212	if (tb[IFAL_ADDRESS]) {
213		n->nlmsg_type = RTM_DELADDRLABEL;
214		n->nlmsg_flags = NLM_F_REQUEST;
215
216		if (rtnl_open(&rth2, 0) < 0)
217			return -1;
218
219		if (rtnl_talk(&rth2, n, 0, 0, NULL, NULL, NULL) < 0)
220			return -2;
221
222		rtnl_close(&rth2);
223	}
224
225	return 0;
226}
227
228static int ipaddrlabel_flush(int argc, char **argv)
229{
230	int af = preferred_family;
231
232	if (af == AF_UNSPEC)
233		af = AF_INET6;
234
235	if (argc > 0) {
236		fprintf(stderr, "\"ip addrlabel flush\" does not allow extra arguments\n");
237		return -1;
238	}
239
240	if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) {
241		perror("Cannot send dump request");
242		return 1;
243	}
244
245	if (rtnl_dump_filter(&rth, flush_addrlabel, NULL, NULL, NULL) < 0) {
246		fprintf(stderr, "Flush terminated\n");
247		return 1;
248	}
249
250	return 0;
251}
252
253int do_ipaddrlabel(int argc, char **argv)
254{
255	if (argc < 1) {
256		return ipaddrlabel_list(0, NULL);
257	} else if (matches(argv[0], "list") == 0 ||
258		   matches(argv[0], "show") == 0) {
259		return ipaddrlabel_list(argc-1, argv+1);
260	} else if (matches(argv[0], "add") == 0) {
261		return ipaddrlabel_modify(RTM_NEWADDRLABEL, argc-1, argv+1);
262	} else if (matches(argv[0], "delete") == 0) {
263		return ipaddrlabel_modify(RTM_DELADDRLABEL, argc-1, argv+1);
264	} else if (matches(argv[0], "flush") == 0) {
265		return ipaddrlabel_flush(argc-1, argv+1);
266	} else if (matches(argv[0], "help") == 0)
267		usage();
268
269	fprintf(stderr, "Command \"%s\" is unknown, try \"ip addrlabel help\".\n", *argv);
270	exit(-1);
271}
272
273