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    Annotation of /trunk/mkinitrd-magellan/busybox/networking/libiproute/iplink.c

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    Revision 532 - (hide annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
    File MIME type: text/plain
    File size: 6940 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 niro 532 /* vi: set sw=4 ts=4: */
    2     /*
    3     * iplink.c "ip link".
    4     *
    5     * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
    6     *
    7     * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8     */
    9    
    10     #include "libbb.h"
    11    
    12     #include <sys/ioctl.h>
    13     #include <sys/socket.h>
    14    
    15     #include <net/if.h>
    16     #include <net/if_packet.h>
    17     #include <netpacket/packet.h>
    18    
    19     #include <net/ethernet.h>
    20    
    21     #include "rt_names.h"
    22     #include "utils.h"
    23     #include "ip_common.h"
    24    
    25     /* take from linux/sockios.h */
    26     #define SIOCSIFNAME 0x8923 /* set interface name */
    27    
    28     static int on_off(char *msg)
    29     {
    30     bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
    31     return -1;
    32     }
    33    
    34     static int get_ctl_fd(void)
    35     {
    36     int s_errno;
    37     int fd;
    38    
    39     fd = socket(PF_INET, SOCK_DGRAM, 0);
    40     if (fd >= 0)
    41     return fd;
    42     s_errno = errno;
    43     fd = socket(PF_PACKET, SOCK_DGRAM, 0);
    44     if (fd >= 0)
    45     return fd;
    46     fd = socket(PF_INET6, SOCK_DGRAM, 0);
    47     if (fd >= 0)
    48     return fd;
    49     errno = s_errno;
    50     bb_perror_msg("cannot create control socket");
    51     return -1;
    52     }
    53    
    54     static int do_chflags(char *dev, uint32_t flags, uint32_t mask)
    55     {
    56     struct ifreq ifr;
    57     int fd;
    58     int err;
    59    
    60     strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
    61     fd = get_ctl_fd();
    62     if (fd < 0)
    63     return -1;
    64     err = ioctl(fd, SIOCGIFFLAGS, &ifr);
    65     if (err) {
    66     bb_perror_msg("SIOCGIFFLAGS");
    67     close(fd);
    68     return -1;
    69     }
    70     if ((ifr.ifr_flags^flags)&mask) {
    71     ifr.ifr_flags &= ~mask;
    72     ifr.ifr_flags |= mask&flags;
    73     err = ioctl(fd, SIOCSIFFLAGS, &ifr);
    74     if (err)
    75     bb_perror_msg("SIOCSIFFLAGS");
    76     }
    77     close(fd);
    78     return err;
    79     }
    80    
    81     static int do_changename(char *dev, char *newdev)
    82     {
    83     struct ifreq ifr;
    84     int fd;
    85     int err;
    86    
    87     strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
    88     strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname));
    89     fd = get_ctl_fd();
    90     if (fd < 0)
    91     return -1;
    92     err = ioctl(fd, SIOCSIFNAME, &ifr);
    93     if (err) {
    94     bb_perror_msg("SIOCSIFNAME");
    95     close(fd);
    96     return -1;
    97     }
    98     close(fd);
    99     return err;
    100     }
    101    
    102     static int set_qlen(char *dev, int qlen)
    103     {
    104     struct ifreq ifr;
    105     int s;
    106    
    107     s = get_ctl_fd();
    108     if (s < 0)
    109     return -1;
    110    
    111     memset(&ifr, 0, sizeof(ifr));
    112     strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
    113     ifr.ifr_qlen = qlen;
    114     if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
    115     bb_perror_msg("SIOCSIFXQLEN");
    116     close(s);
    117     return -1;
    118     }
    119     close(s);
    120    
    121     return 0;
    122     }
    123    
    124     static int set_mtu(char *dev, int mtu)
    125     {
    126     struct ifreq ifr;
    127     int s;
    128    
    129     s = get_ctl_fd();
    130     if (s < 0)
    131     return -1;
    132    
    133     memset(&ifr, 0, sizeof(ifr));
    134     strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
    135     ifr.ifr_mtu = mtu;
    136     if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
    137     bb_perror_msg("SIOCSIFMTU");
    138     close(s);
    139     return -1;
    140     }
    141     close(s);
    142    
    143     return 0;
    144     }
    145    
    146     static int get_address(char *dev, int *htype)
    147     {
    148     struct ifreq ifr;
    149     struct sockaddr_ll me;
    150     socklen_t alen;
    151     int s;
    152    
    153     s = socket(PF_PACKET, SOCK_DGRAM, 0);
    154     if (s < 0) {
    155     bb_perror_msg("socket(PF_PACKET)");
    156     return -1;
    157     }
    158    
    159     memset(&ifr, 0, sizeof(ifr));
    160     strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name));
    161     if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
    162     bb_perror_msg("SIOCGIFINDEX");
    163     close(s);
    164     return -1;
    165     }
    166    
    167     memset(&me, 0, sizeof(me));
    168     me.sll_family = AF_PACKET;
    169     me.sll_ifindex = ifr.ifr_ifindex;
    170     me.sll_protocol = htons(ETH_P_LOOP);
    171     if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
    172     bb_perror_msg("bind");
    173     close(s);
    174     return -1;
    175     }
    176    
    177     alen = sizeof(me);
    178     if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
    179     bb_perror_msg("getsockname");
    180     close(s);
    181     return -1;
    182     }
    183     close(s);
    184     *htype = me.sll_hatype;
    185     return me.sll_halen;
    186     }
    187    
    188     static int parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
    189     {
    190     int alen;
    191    
    192     memset(ifr, 0, sizeof(*ifr));
    193     strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name));
    194     ifr->ifr_hwaddr.sa_family = hatype;
    195     alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), 14, lla);
    196     if (alen < 0)
    197     return -1;
    198     if (alen != halen) {
    199     bb_error_msg("wrong address (%s) length: expected %d bytes", lla, halen);
    200     return -1;
    201     }
    202     return 0;
    203     }
    204    
    205     static int set_address(struct ifreq *ifr, int brd)
    206     {
    207     int s;
    208    
    209     s = get_ctl_fd();
    210     if (s < 0)
    211     return -1;
    212     if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
    213     bb_perror_msg(brd ? "SIOCSIFHWBROADCAST" : "SIOCSIFHWADDR");
    214     close(s);
    215     return -1;
    216     }
    217     close(s);
    218     return 0;
    219     }
    220    
    221    
    222     static int do_set(int argc, char **argv)
    223     {
    224     char *dev = NULL;
    225     uint32_t mask = 0;
    226     uint32_t flags = 0;
    227     int qlen = -1;
    228     int mtu = -1;
    229     char *newaddr = NULL;
    230     char *newbrd = NULL;
    231     struct ifreq ifr0, ifr1;
    232     char *newname = NULL;
    233     int htype, halen;
    234    
    235     while (argc > 0) {
    236     if (strcmp(*argv, "up") == 0) {
    237     mask |= IFF_UP;
    238     flags |= IFF_UP;
    239     } else if (strcmp(*argv, "down") == 0) {
    240     mask |= IFF_UP;
    241     flags &= ~IFF_UP;
    242     } else if (strcmp(*argv, "name") == 0) {
    243     NEXT_ARG();
    244     newname = *argv;
    245     } else if (strcmp(*argv, "mtu") == 0) {
    246     NEXT_ARG();
    247     if (mtu != -1)
    248     duparg("mtu", *argv);
    249     if (get_integer(&mtu, *argv, 0))
    250     invarg(*argv, "mtu");
    251     } else if (strcmp(*argv, "multicast") == 0) {
    252     NEXT_ARG();
    253     mask |= IFF_MULTICAST;
    254     if (strcmp(*argv, "on") == 0) {
    255     flags |= IFF_MULTICAST;
    256     } else if (strcmp(*argv, "off") == 0) {
    257     flags &= ~IFF_MULTICAST;
    258     } else
    259     return on_off("multicast");
    260     } else if (strcmp(*argv, "arp") == 0) {
    261     NEXT_ARG();
    262     mask |= IFF_NOARP;
    263     if (strcmp(*argv, "on") == 0) {
    264     flags &= ~IFF_NOARP;
    265     } else if (strcmp(*argv, "off") == 0) {
    266     flags |= IFF_NOARP;
    267     } else
    268     return on_off("noarp");
    269     } else if (strcmp(*argv, "addr") == 0) {
    270     NEXT_ARG();
    271     newaddr = *argv;
    272     } else {
    273     if (strcmp(*argv, "dev") == 0) {
    274     NEXT_ARG();
    275     }
    276     if (dev)
    277     duparg2("dev", *argv);
    278     dev = *argv;
    279     }
    280     argc--; argv++;
    281     }
    282    
    283     if (!dev) {
    284     bb_error_msg(bb_msg_requires_arg, "\"dev\"");
    285     exit(-1);
    286     }
    287    
    288     if (newaddr || newbrd) {
    289     halen = get_address(dev, &htype);
    290     if (halen < 0)
    291     return -1;
    292     if (newaddr) {
    293     if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
    294     return -1;
    295     }
    296     if (newbrd) {
    297     if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
    298     return -1;
    299     }
    300     }
    301    
    302     if (newname && strcmp(dev, newname)) {
    303     if (do_changename(dev, newname) < 0)
    304     return -1;
    305     dev = newname;
    306     }
    307     if (qlen != -1) {
    308     if (set_qlen(dev, qlen) < 0)
    309     return -1;
    310     }
    311     if (mtu != -1) {
    312     if (set_mtu(dev, mtu) < 0)
    313     return -1;
    314     }
    315     if (newaddr || newbrd) {
    316     if (newbrd) {
    317     if (set_address(&ifr1, 1) < 0)
    318     return -1;
    319     }
    320     if (newaddr) {
    321     if (set_address(&ifr0, 0) < 0)
    322     return -1;
    323     }
    324     }
    325     if (mask)
    326     return do_chflags(dev, flags, mask);
    327     return 0;
    328     }
    329    
    330     static int ipaddr_list_link(int argc, char **argv)
    331     {
    332     preferred_family = AF_PACKET;
    333     return ipaddr_list_or_flush(argc, argv, 0);
    334     }
    335    
    336     int do_iplink(int argc, char **argv)
    337     {
    338     if (argc > 0) {
    339     if (matches(*argv, "set") == 0)
    340     return do_set(argc-1, argv+1);
    341     if (matches(*argv, "show") == 0 ||
    342     matches(*argv, "lst") == 0 ||
    343     matches(*argv, "list") == 0)
    344     return ipaddr_list_link(argc-1, argv+1);
    345     } else
    346     return ipaddr_list_link(0, NULL);
    347    
    348     bb_error_msg("command \"%s\" is unknown", *argv);
    349     exit(-1);
    350     }