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