2 * ipmaddr.c "ip maddress".
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
18 #include <sys/ioctl.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
24 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <linux/sockios.h>
37 static void usage(void) __attribute__((noreturn));
39 static void usage(void)
41 fprintf(stderr, "Usage: ip maddr [ add | del ] MULTIADDR dev STRING\n");
42 fprintf(stderr, " ip maddr show [ dev STRING ]\n");
46 static int parse_hex(char *str, unsigned char *addr, size_t size)
50 while (*str && (len < 2 * size)) {
54 if (sscanf(str, "%02x", &tmp) != 1)
73 void maddr_ins(struct ma_info **lst, struct ma_info *m)
77 for (; (mp=*lst) != NULL; lst = &mp->next) {
78 if (mp->index > m->index)
85 void read_dev_mcast(struct ma_info **result_p)
88 FILE *fp = fopen("/proc/net/dev_mcast", "r");
93 while (fgets(buf, sizeof(buf), fp)) {
99 memset(&m, 0, sizeof(m));
100 sscanf(buf, "%d%s%d%d%s", &m.index, m.name, &m.users, &st,
102 if (filter.dev && strcmp(filter.dev, m.name))
105 m.addr.family = AF_PACKET;
107 len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
109 struct ma_info *ma = malloc(sizeof(m));
111 memcpy(ma, &m, sizeof(m));
112 ma->addr.bytelen = len;
113 ma->addr.bitlen = len<<3;
115 ma->features = "static";
116 maddr_ins(result_p, ma);
122 void read_igmp(struct ma_info **result_p)
126 FILE *fp = fopen("/proc/net/igmp", "r");
130 memset(&m, 0, sizeof(m));
131 if (!fgets(buf, sizeof(buf), fp))
134 m.addr.family = AF_INET;
138 while (fgets(buf, sizeof(buf), fp)) {
141 if (buf[0] != '\t') {
142 sscanf(buf, "%d%s", &m.index, m.name);
146 if (filter.dev && strcmp(filter.dev, m.name))
149 sscanf(buf, "%08x%d", (__u32*)&m.addr.data, &m.users);
151 ma = malloc(sizeof(m));
152 memcpy(ma, &m, sizeof(m));
153 maddr_ins(result_p, ma);
159 void read_igmp6(struct ma_info **result_p)
162 FILE *fp = fopen("/proc/net/igmp6", "r");
167 while (fgets(buf, sizeof(buf), fp)) {
172 memset(&m, 0, sizeof(m));
173 sscanf(buf, "%d%s%s%d", &m.index, m.name, hexa, &m.users);
175 if (filter.dev && strcmp(filter.dev, m.name))
178 m.addr.family = AF_INET6;
180 len = parse_hex(hexa, (unsigned char*)&m.addr.data, sizeof (m.addr.data));
182 struct ma_info *ma = malloc(sizeof(m));
184 memcpy(ma, &m, sizeof(m));
186 ma->addr.bytelen = len;
187 ma->addr.bitlen = len<<3;
188 maddr_ins(result_p, ma);
194 static void print_maddr(FILE *fp, struct ma_info *list)
198 if (list->addr.family == AF_PACKET) {
200 fprintf(fp, "link %s", ll_addr_n2a((unsigned char*)list->addr.data,
201 list->addr.bytelen, 0,
205 switch(list->addr.family) {
207 fprintf(fp, "inet ");
210 fprintf(fp, "inet6 ");
213 fprintf(fp, "family %d ", list->addr.family);
217 format_host(list->addr.family,
220 abuf, sizeof(abuf)));
222 if (list->users != 1)
223 fprintf(fp, " users %d", list->users);
225 fprintf(fp, " %s", list->features);
229 static void print_mlist(FILE *fp, struct ma_info *list)
233 for (; list; list = list->next) {
235 cur_index = list->index;
236 fprintf(fp, "%d:\t%s%s", cur_index, list->name, _SL_);
237 } else if (cur_index != list->index) {
238 cur_index = list->index;
239 fprintf(fp, "%d:\t%s\n", cur_index, list->name);
241 print_maddr(fp, list);
245 static int multiaddr_list(int argc, char **argv)
247 struct ma_info *list = NULL;
250 filter.family = preferred_family;
254 if (strcmp(*argv, "dev") == 0) {
257 if (matches(*argv, "help") == 0)
260 duparg2("dev", *argv);
266 if (!filter.family || filter.family == AF_PACKET)
267 read_dev_mcast(&list);
268 if (!filter.family || filter.family == AF_INET)
270 if (!filter.family || filter.family == AF_INET6)
272 print_mlist(stdout, list);
276 int multiaddr_modify(int cmd, int argc, char **argv)
281 memset(&ifr, 0, sizeof(ifr));
283 if (cmd == RTM_NEWADDR)
289 if (strcmp(*argv, "dev") == 0) {
292 duparg("dev", *argv);
293 strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
295 if (matches(*argv, "address") == 0) {
298 if (matches(*argv, "help") == 0)
300 if (ifr.ifr_hwaddr.sa_data[0])
301 duparg("address", *argv);
302 if (ll_addr_a2n(ifr.ifr_hwaddr.sa_data,
304 fprintf(stderr, "Error: \"%s\" is not a legal ll address.\n", *argv);
310 if (ifr.ifr_name[0] == 0) {
311 fprintf(stderr, "Not enough information: \"dev\" is required.\n");
315 fd = socket(AF_INET, SOCK_DGRAM, 0);
317 perror("Cannot create socket");
320 if (ioctl(fd, cmd, (char*)&ifr) != 0) {
330 int do_multiaddr(int argc, char **argv)
333 return multiaddr_list(0, NULL);
334 if (matches(*argv, "add") == 0)
335 return multiaddr_modify(RTM_NEWADDR, argc-1, argv+1);
336 if (matches(*argv, "delete") == 0)
337 return multiaddr_modify(RTM_DELADDR, argc-1, argv+1);
338 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
339 || matches(*argv, "lst") == 0)
340 return multiaddr_list(argc-1, argv+1);
341 if (matches(*argv, "help") == 0)
343 fprintf(stderr, "Command \"%s\" is unknown, try \"ip maddr help\".\n", *argv);