+/*
+ * iplink.c "ip link".
+ *
+ * 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.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#include <linux/sockios.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <linux/sockios.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+
+static void usage(void) __attribute__((noreturn));
+
+void iplink_usage(void)
+{
+ fprintf(stderr, "Usage: ip link set DEVICE { up | down | arp { on | off } |\n");
+ fprintf(stderr, " dynamic { on | off } |\n");
+ fprintf(stderr, " multicast { on | off } | txqueuelen PACKETS |\n");
+ fprintf(stderr, " name NEWNAME |\n");
+ fprintf(stderr, " address LLADDR | broadcast LLADDR |\n");
+ fprintf(stderr, " mtu MTU }\n");
+ fprintf(stderr, " ip link show [ DEVICE ]\n");
+ exit(-1);
+}
+
+static void usage(void)
+{
+ iplink_usage();
+}
+
+static int on_off(char *msg)
+{
+ fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
+ return -1;
+}
+
+static int get_ctl_fd(void)
+{
+ int s_errno;
+ int fd;
+
+ fd = socket(PF_INET, SOCK_DGRAM, 0);
+ if (fd >= 0)
+ return fd;
+ s_errno = errno;
+ fd = socket(PF_PACKET, SOCK_DGRAM, 0);
+ if (fd >= 0)
+ return fd;
+ fd = socket(PF_INET6, SOCK_DGRAM, 0);
+ if (fd >= 0)
+ return fd;
+ errno = s_errno;
+ perror("Cannot create control socket");
+ return -1;
+}
+
+static int do_chflags(char *dev, __u32 flags, __u32 mask)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ strcpy(ifr.ifr_name, dev);
+ fd = get_ctl_fd();
+ if (fd < 0)
+ return -1;
+ err = ioctl(fd, SIOCGIFFLAGS, &ifr);
+ if (err) {
+ perror("SIOCGIFFLAGS");
+ close(fd);
+ return -1;
+ }
+ if ((ifr.ifr_flags^flags)&mask) {
+ ifr.ifr_flags &= ~mask;
+ ifr.ifr_flags |= mask&flags;
+ err = ioctl(fd, SIOCSIFFLAGS, &ifr);
+ if (err)
+ perror("SIOCSIFFLAGS");
+ }
+ close(fd);
+ return err;
+}
+
+static int do_changename(char *dev, char *newdev)
+{
+ struct ifreq ifr;
+ int fd;
+ int err;
+
+ strcpy(ifr.ifr_name, dev);
+ strcpy(ifr.ifr_newname, newdev);
+ fd = get_ctl_fd();
+ if (fd < 0)
+ return -1;
+ err = ioctl(fd, SIOCSIFNAME, &ifr);
+ if (err) {
+ perror("SIOCSIFNAME");
+ close(fd);
+ return -1;
+ }
+ close(fd);
+ return err;
+}
+
+static int set_qlen(char *dev, int qlen)
+{
+ struct ifreq ifr;
+ int s;
+
+ s = get_ctl_fd();
+ if (s < 0)
+ return -1;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strcpy(ifr.ifr_name, dev);
+ ifr.ifr_qlen = qlen;
+ if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
+ perror("SIOCSIFXQLEN");
+ close(s);
+ return -1;
+ }
+ close(s);
+
+ return 0;
+}
+
+static int set_mtu(char *dev, int mtu)
+{
+ struct ifreq ifr;
+ int s;
+
+ s = get_ctl_fd();
+ if (s < 0)
+ return -1;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strcpy(ifr.ifr_name, dev);
+ ifr.ifr_mtu = mtu;
+ if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
+ perror("SIOCSIFMTU");
+ close(s);
+ return -1;
+ }
+ close(s);
+
+ return 0;
+}
+
+static int get_address(char *dev, int *htype)
+{
+ struct ifreq ifr;
+ struct sockaddr_ll me;
+ int alen;
+ int s;
+
+ s = socket(PF_PACKET, SOCK_DGRAM, 0);
+ if (s < 0) {
+ perror("socket(PF_PACKET)");
+ return -1;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ strcpy(ifr.ifr_name, dev);
+ if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
+ perror("SIOCGIFINDEX");
+ close(s);
+ return -1;
+ }
+
+ memset(&me, 0, sizeof(me));
+ me.sll_family = AF_PACKET;
+ me.sll_ifindex = ifr.ifr_ifindex;
+ me.sll_protocol = htons(ETH_P_LOOP);
+ if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
+ perror("bind");
+ close(s);
+ return -1;
+ }
+
+ alen = sizeof(me);
+ if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
+ perror("getsockname");
+ close(s);
+ return -1;
+ }
+ close(s);
+ *htype = me.sll_hatype;
+ return me.sll_halen;
+}
+
+static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
+{
+ int alen;
+
+ memset(ifr, 0, sizeof(*ifr));
+ strcpy(ifr->ifr_name, dev);
+ ifr->ifr_hwaddr.sa_family = hatype;
+ alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
+ if (alen < 0)
+ return -1;
+ if (alen != halen) {
+ fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
+ return -1;
+ }
+ return 0;
+}
+
+static int set_address(struct ifreq *ifr, int brd)
+{
+ int s;
+
+ s = get_ctl_fd();
+ if (s < 0)
+ return -1;
+ if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
+ perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
+ close(s);
+ return -1;
+ }
+ close(s);
+ return 0;
+}
+
+
+static int do_set(int argc, char **argv)
+{
+ char *dev = NULL;
+ __u32 mask = 0;
+ __u32 flags = 0;
+ int qlen = -1;
+ int mtu = -1;
+ char *newaddr = NULL;
+ char *newbrd = NULL;
+ struct ifreq ifr0, ifr1;
+ char *newname = NULL;
+ int htype, halen;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "up") == 0) {
+ mask |= IFF_UP;
+ flags |= IFF_UP;
+ } else if (strcmp(*argv, "down") == 0) {
+ mask |= IFF_UP;
+ flags &= ~IFF_UP;
+ } else if (strcmp(*argv, "name") == 0) {
+ NEXT_ARG();
+ newname = *argv;
+ } else if (matches(*argv, "address") == 0) {
+ NEXT_ARG();
+ newaddr = *argv;
+ } else if (matches(*argv, "broadcast") == 0 ||
+ strcmp(*argv, "brd") == 0) {
+ NEXT_ARG();
+ newbrd = *argv;
+ } else if (matches(*argv, "txqueuelen") == 0 ||
+ strcmp(*argv, "qlen") == 0 ||
+ matches(*argv, "txqlen") == 0) {
+ NEXT_ARG();
+ if (qlen != -1)
+ duparg("txqueuelen", *argv);
+ if (get_integer(&qlen, *argv, 0))
+ invarg("Invalid \"txqueuelen\" value\n", *argv);
+ } else if (strcmp(*argv, "mtu") == 0) {
+ NEXT_ARG();
+ if (mtu != -1)
+ duparg("mtu", *argv);
+ if (get_integer(&mtu, *argv, 0))
+ invarg("Invalid \"mtu\" value\n", *argv);
+ } else if (strcmp(*argv, "multicast") == 0) {
+ NEXT_ARG();
+ mask |= IFF_MULTICAST;
+ if (strcmp(*argv, "on") == 0) {
+ flags |= IFF_MULTICAST;
+ } else if (strcmp(*argv, "off") == 0) {
+ flags &= ~IFF_MULTICAST;
+ } else
+ return on_off("multicast");
+ } else if (strcmp(*argv, "arp") == 0) {
+ NEXT_ARG();
+ mask |= IFF_NOARP;
+ if (strcmp(*argv, "on") == 0) {
+ flags &= ~IFF_NOARP;
+ } else if (strcmp(*argv, "off") == 0) {
+ flags |= IFF_NOARP;
+ } else
+ return on_off("noarp");
+#ifdef IFF_DYNAMIC
+ } else if (matches(*argv, "dynamic") == 0) {
+ NEXT_ARG();
+ mask |= IFF_DYNAMIC;
+ if (strcmp(*argv, "on") == 0) {
+ flags |= IFF_DYNAMIC;
+ } else if (strcmp(*argv, "off") == 0) {
+ flags &= ~IFF_DYNAMIC;
+ } else
+ return on_off("dynamic");
+#endif
+ } else {
+ if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ }
+ if (matches(*argv, "help") == 0)
+ usage();
+ if (dev)
+ duparg2("dev", *argv);
+ dev = *argv;
+ }
+ argc--; argv++;
+ }
+
+ if (!dev) {
+ fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
+ exit(-1);
+ }
+
+ if (newaddr || newbrd) {
+ halen = get_address(dev, &htype);
+ if (halen < 0)
+ return -1;
+ if (newaddr) {
+ if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
+ return -1;
+ }
+ if (newbrd) {
+ if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
+ return -1;
+ }
+ }
+
+ if (newname && strcmp(dev, newname)) {
+ if (do_changename(dev, newname) < 0)
+ return -1;
+ dev = newname;
+ }
+ if (qlen != -1) {
+ if (set_qlen(dev, qlen) < 0)
+ return -1;
+ }
+ if (mtu != -1) {
+ if (set_mtu(dev, mtu) < 0)
+ return -1;
+ }
+ if (newaddr || newbrd) {
+ if (newbrd) {
+ if (set_address(&ifr1, 1) < 0)
+ return -1;
+ }
+ if (newaddr) {
+ if (set_address(&ifr0, 0) < 0)
+ return -1;
+ }
+ }
+ if (mask)
+ return do_chflags(dev, flags, mask);
+ return 0;
+}
+
+int do_iplink(int argc, char **argv)
+{
+ if (argc > 0) {
+ if (matches(*argv, "set") == 0)
+ return do_set(argc-1, argv+1);
+ if (matches(*argv, "show") == 0 ||
+ matches(*argv, "lst") == 0 ||
+ matches(*argv, "list") == 0)
+ return ipaddr_list_link(argc-1, argv+1);
+ if (matches(*argv, "help") == 0)
+ usage();
+ } else
+ return ipaddr_list_link(0, NULL);
+
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
+ exit(-1);
+}
projects / mirror_iproute2.git / blobdiff