blob: 1d324dac02119acffaa34ce77205f5eacb39b2ab [file] [log] [blame]
/*
* ipaddrlabel.c "ip addrlabel"
*
* Copyright (C)2007 USAGI/WIDE Project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses>.
*
*
* Based on iprule.c.
*
* Authors: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <string.h>
#include <linux/types.h>
#include <linux/if_addrlabel.h>
#include "rt_names.h"
#include "utils.h"
#include "ip_common.h"
#define IFAL_RTA(r) ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrlblmsg))))
#define IFAL_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrlblmsg))
extern struct rtnl_handle rth;
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip addrlabel { add | del } prefix PREFIX [ dev DEV ] [ label LABEL ]\n");
fprintf(stderr, " ip addrlabel [ list | flush | help ]\n");
exit(-1);
}
int print_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct ifaddrlblmsg *ifal = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[IFAL_MAX+1];
if (n->nlmsg_type != RTM_NEWADDRLABEL && n->nlmsg_type != RTM_DELADDRLABEL)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifal));
if (len < 0)
return -1;
parse_rtattr(tb, IFAL_MAX, IFAL_RTA(ifal), len);
if (n->nlmsg_type == RTM_DELADDRLABEL)
fprintf(fp, "Deleted ");
if (tb[IFAL_ADDRESS]) {
fprintf(fp, "prefix %s/%u ",
format_host_rta(ifal->ifal_family,
tb[IFAL_ADDRESS]),
ifal->ifal_prefixlen);
}
if (ifal->ifal_index)
fprintf(fp, "dev %s ", ll_index_to_name(ifal->ifal_index));
if (tb[IFAL_LABEL] && RTA_PAYLOAD(tb[IFAL_LABEL]) == sizeof(uint32_t)) {
uint32_t label;
memcpy(&label, RTA_DATA(tb[IFAL_LABEL]), sizeof(label));
fprintf(fp, "label %u ", label);
}
fprintf(fp, "\n");
fflush(fp);
return 0;
}
static int ipaddrlabel_list(int argc, char **argv)
{
int af = preferred_family;
if (af == AF_UNSPEC)
af = AF_INET6;
if (argc > 0) {
fprintf(stderr, "\"ip addrlabel show\" does not take any arguments.\n");
return -1;
}
if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) {
perror("Cannot send dump request");
return 1;
}
if (rtnl_dump_filter(&rth, print_addrlabel, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
return 1;
}
return 0;
}
static int ipaddrlabel_modify(int cmd, int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct ifaddrlblmsg ifal;
char buf[1024];
} req = {
.n.nlmsg_type = cmd,
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
.n.nlmsg_flags = NLM_F_REQUEST,
.ifal.ifal_family = preferred_family,
};
inet_prefix prefix = {};
uint32_t label = 0xffffffffUL;
char *p = NULL;
char *l = NULL;
if (cmd == RTM_NEWADDRLABEL) {
req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
}
while (argc > 0) {
if (strcmp(*argv, "prefix") == 0) {
NEXT_ARG();
p = *argv;
get_prefix(&prefix, *argv, preferred_family);
} else if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
if ((req.ifal.ifal_index = ll_name_to_index(*argv)) == 0)
invarg("dev is invalid\n", *argv);
} else if (strcmp(*argv, "label") == 0) {
NEXT_ARG();
l = *argv;
if (get_u32(&label, *argv, 0) || label == 0xffffffffUL)
invarg("label is invalid\n", *argv);
}
argc--;
argv++;
}
if (p == NULL) {
fprintf(stderr, "Not enough information: \"prefix\" argument is required.\n");
return -1;
}
if (l == NULL) {
fprintf(stderr, "Not enough information: \"label\" argument is required.\n");
return -1;
}
addattr32(&req.n, sizeof(req), IFAL_LABEL, label);
addattr_l(&req.n, sizeof(req), IFAL_ADDRESS, &prefix.data, prefix.bytelen);
req.ifal.ifal_prefixlen = prefix.bitlen;
if (req.ifal.ifal_family == AF_UNSPEC)
req.ifal.ifal_family = AF_INET6;
if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
return -2;
return 0;
}
static int flush_addrlabel(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
struct rtnl_handle rth2;
struct rtmsg *r = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[IFAL_MAX+1];
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0)
return -1;
parse_rtattr(tb, IFAL_MAX, RTM_RTA(r), len);
if (tb[IFAL_ADDRESS]) {
n->nlmsg_type = RTM_DELADDRLABEL;
n->nlmsg_flags = NLM_F_REQUEST;
if (rtnl_open(&rth2, 0) < 0)
return -1;
if (rtnl_talk(&rth2, n, NULL, 0) < 0)
return -2;
rtnl_close(&rth2);
}
return 0;
}
static int ipaddrlabel_flush(int argc, char **argv)
{
int af = preferred_family;
if (af == AF_UNSPEC)
af = AF_INET6;
if (argc > 0) {
fprintf(stderr, "\"ip addrlabel flush\" does not allow extra arguments\n");
return -1;
}
if (rtnl_wilddump_request(&rth, af, RTM_GETADDRLABEL) < 0) {
perror("Cannot send dump request");
return -1;
}
if (rtnl_dump_filter(&rth, flush_addrlabel, NULL) < 0) {
fprintf(stderr, "Flush terminated\n");
return -1;
}
return 0;
}
int do_ipaddrlabel(int argc, char **argv)
{
if (argc < 1) {
return ipaddrlabel_list(0, NULL);
} else if (matches(argv[0], "list") == 0 ||
matches(argv[0], "lst") == 0 ||
matches(argv[0], "show") == 0) {
return ipaddrlabel_list(argc-1, argv+1);
} else if (matches(argv[0], "add") == 0) {
return ipaddrlabel_modify(RTM_NEWADDRLABEL, argc-1, argv+1);
} else if (matches(argv[0], "delete") == 0) {
return ipaddrlabel_modify(RTM_DELADDRLABEL, argc-1, argv+1);
} else if (matches(argv[0], "flush") == 0) {
return ipaddrlabel_flush(argc-1, argv+1);
} else if (matches(argv[0], "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip addrlabel help\".\n", *argv);
exit(-1);
}