From 9a2d27249cc2235f7e001a9ea8d4605406bc5f38 Mon Sep 17 00:00:00 2001 From: Glenn L McGrath Date: Sun, 10 Nov 2002 01:33:55 +0000 Subject: IP applet by Bastian Blank --- networking/libiproute/iplink.c | 349 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 349 insertions(+) create mode 100644 networking/libiproute/iplink.c (limited to 'networking/libiproute/iplink.c') diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c new file mode 100644 index 000000000..90d60b44c --- /dev/null +++ b/networking/libiproute/iplink.c @@ -0,0 +1,349 @@ +/* + * 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, + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "rt_names.h" +#include "utils.h" +#include "ip_common.h" + +#include "busybox.h" + +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 (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"); + } else { + if (strcmp(*argv, "dev") == 0) { + NEXT_ARG(); + } + 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); + } else + return ipaddr_list_link(0, NULL); + + fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv); + exit(-1); +} -- cgit v1.2.3