diff options
Diffstat (limited to 'networking/libiproute/iplink.c')
| -rw-r--r-- | networking/libiproute/iplink.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/networking/libiproute/iplink.c b/networking/libiproute/iplink.c new file mode 100644 index 0000000..8de17bf --- /dev/null +++ b/networking/libiproute/iplink.c @@ -0,0 +1,306 @@ +/* vi: set sw=4 ts=4: */ +/* + * iplink.c "ip link". + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + */ + +//#include <sys/ioctl.h> +//#include <sys/socket.h> +#include <net/if.h> +#include <net/if_packet.h> +#include <netpacket/packet.h> +#include <net/ethernet.h> + +#include "ip_common.h" /* #include "libbb.h" is inside */ +#include "rt_names.h" +#include "utils.h" + +/* taken from linux/sockios.h */ +#define SIOCSIFNAME 0x8923 /* set interface name */ + +/* Exits on error */ +static int get_ctl_fd(void) +{ + int fd; + + fd = socket(PF_INET, SOCK_DGRAM, 0); + if (fd >= 0) + return fd; + fd = socket(PF_PACKET, SOCK_DGRAM, 0); + if (fd >= 0) + return fd; + return xsocket(PF_INET6, SOCK_DGRAM, 0); +} + +/* Exits on error */ +static void do_chflags(char *dev, uint32_t flags, uint32_t mask) +{ + struct ifreq ifr; + int fd; + + strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + fd = get_ctl_fd(); + xioctl(fd, SIOCGIFFLAGS, &ifr); + if ((ifr.ifr_flags ^ flags) & mask) { + ifr.ifr_flags &= ~mask; + ifr.ifr_flags |= mask & flags; + xioctl(fd, SIOCSIFFLAGS, &ifr); + } + close(fd); +} + +/* Exits on error */ +static void do_changename(char *dev, char *newdev) +{ + struct ifreq ifr; + int fd; + + strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + strncpy(ifr.ifr_newname, newdev, sizeof(ifr.ifr_newname)); + fd = get_ctl_fd(); + xioctl(fd, SIOCSIFNAME, &ifr); + close(fd); +} + +/* Exits on error */ +static void set_qlen(char *dev, int qlen) +{ + struct ifreq ifr; + int s; + + s = get_ctl_fd(); + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + ifr.ifr_qlen = qlen; + xioctl(s, SIOCSIFTXQLEN, &ifr); + close(s); +} + +/* Exits on error */ +static void set_mtu(char *dev, int mtu) +{ + struct ifreq ifr; + int s; + + s = get_ctl_fd(); + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + ifr.ifr_mtu = mtu; + xioctl(s, SIOCSIFMTU, &ifr); + close(s); +} + +/* Exits on error */ +static int get_address(char *dev, int *htype) +{ + struct ifreq ifr; + struct sockaddr_ll me; + socklen_t alen; + int s; + + s = xsocket(PF_PACKET, SOCK_DGRAM, 0); + + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + xioctl(s, SIOCGIFINDEX, &ifr); + + memset(&me, 0, sizeof(me)); + me.sll_family = AF_PACKET; + me.sll_ifindex = ifr.ifr_ifindex; + me.sll_protocol = htons(ETH_P_LOOP); + xbind(s, (struct sockaddr*)&me, sizeof(me)); + + alen = sizeof(me); + if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) { + bb_perror_msg_and_die("getsockname"); + } + close(s); + *htype = me.sll_hatype; + return me.sll_halen; +} + +/* Exits on error */ +static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr) +{ + int alen; + + memset(ifr, 0, sizeof(*ifr)); + strncpy(ifr->ifr_name, dev, sizeof(ifr->ifr_name)); + ifr->ifr_hwaddr.sa_family = hatype; + + alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/; + alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla); + if (alen < 0) + exit(EXIT_FAILURE); + if (alen != halen) { + bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen); + } +} + +/* Exits on error */ +static void set_address(struct ifreq *ifr, int brd) +{ + int s; + + s = get_ctl_fd(); + if (brd) + xioctl(s, SIOCSIFHWBROADCAST, ifr); + else + xioctl(s, SIOCSIFHWADDR, ifr); + close(s); +} + + +static void die_must_be_on_off(const char *msg) NORETURN; +static void die_must_be_on_off(const char *msg) +{ + bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg); +} + +/* Return value becomes exitcode. It's okay to not return at all */ +static int do_set(char **argv) +{ + char *dev = NULL; + uint32_t mask = 0; + uint32_t flags = 0; + int qlen = -1; + int mtu = -1; + char *newaddr = NULL; + char *newbrd = NULL; + struct ifreq ifr0, ifr1; + char *newname = NULL; + int htype, halen; + static const char keywords[] ALIGN1 = + "up\0""down\0""name\0""mtu\0""multicast\0" + "arp\0""address\0""dev\0"; + enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_multicast, + ARG_arp, ARG_addr, ARG_dev }; + static const char str_on_off[] ALIGN1 = "on\0""off\0"; + enum { PARM_on = 0, PARM_off }; + smalluint key; + + while (*argv) { + /* substring search ensures that e.g. "addr" and "address" + * are both accepted */ + key = index_in_substrings(keywords, *argv); + if (key == ARG_up) { + mask |= IFF_UP; + flags |= IFF_UP; + } + if (key == ARG_down) { + mask |= IFF_UP; + flags &= ~IFF_UP; + } + if (key == ARG_name) { + NEXT_ARG(); + newname = *argv; + } + if (key == ARG_mtu) { + NEXT_ARG(); + if (mtu != -1) + duparg("mtu", *argv); + if (get_integer(&mtu, *argv, 0)) + invarg(*argv, "mtu"); + } + if (key == ARG_multicast) { + int param; + NEXT_ARG(); + mask |= IFF_MULTICAST; + param = index_in_strings(str_on_off, *argv); + if (param < 0) + die_must_be_on_off("multicast"); + if (param == PARM_on) + flags |= IFF_MULTICAST; + else + flags &= ~IFF_MULTICAST; + } + if (key == ARG_arp) { + int param; + NEXT_ARG(); + mask |= IFF_NOARP; + param = index_in_strings(str_on_off, *argv); + if (param < 0) + die_must_be_on_off("arp"); + if (param == PARM_on) + flags &= ~IFF_NOARP; + else + flags |= IFF_NOARP; + } + if (key == ARG_addr) { + NEXT_ARG(); + newaddr = *argv; + } + if (key >= ARG_dev) { + if (key == ARG_dev) { + NEXT_ARG(); + } + if (dev) + duparg2("dev", *argv); + dev = *argv; + } + argv++; + } + + if (!dev) { + bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\""); + } + + if (newaddr || newbrd) { + halen = get_address(dev, &htype); + if (newaddr) { + parse_address(dev, htype, halen, newaddr, &ifr0); + } + if (newbrd) { + parse_address(dev, htype, halen, newbrd, &ifr1); + } + } + + if (newname && strcmp(dev, newname)) { + do_changename(dev, newname); + dev = newname; + } + if (qlen != -1) { + set_qlen(dev, qlen); + } + if (mtu != -1) { + set_mtu(dev, mtu); + } + if (newaddr || newbrd) { + if (newbrd) { + set_address(&ifr1, 1); + } + if (newaddr) { + set_address(&ifr0, 0); + } + } + if (mask) + do_chflags(dev, flags, mask); + return 0; +} + +static int ipaddr_list_link(char **argv) +{ + preferred_family = AF_PACKET; + return ipaddr_list_or_flush(argv, 0); +} + +/* Return value becomes exitcode. It's okay to not return at all */ +int do_iplink(char **argv) +{ + static const char keywords[] ALIGN1 = + "set\0""show\0""lst\0""list\0"; + int key; + if (!*argv) + return ipaddr_list_link(argv); + key = index_in_substrings(keywords, *argv); + if (key < 0) + bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name); + argv++; + if (key == 0) /* set */ + return do_set(argv); + /* show, lst, list */ + return ipaddr_list_link(argv); +} |