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

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    Revision 532 - (show 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 /* 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 }