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iplink.c includes net/if_packet.h, which (on GLIBC) only defines struct sockaddr_pkt. this struct is not used anywhere in the code, and removing the #include makes compilation succeed with musl libc. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
504 lines
12 KiB
C
504 lines
12 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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* Patrick McHardy <kaber@trash.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include <net/if.h>
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/*#include <net/if_packet.h> - not needed? */
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#include <netpacket/packet.h>
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#include <netinet/if_ether.h>
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#include <linux/if_vlan.h>
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#include "ip_common.h" /* #include "libbb.h" is inside */
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#include "rt_names.h"
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#include "utils.h"
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#undef ETH_P_8021AD
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#define ETH_P_8021AD 0x88A8
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#undef VLAN_FLAG_REORDER_HDR
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#define VLAN_FLAG_REORDER_HDR 0x1
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#undef VLAN_FLAG_GVRP
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#define VLAN_FLAG_GVRP 0x2
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#undef VLAN_FLAG_LOOSE_BINDING
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#define VLAN_FLAG_LOOSE_BINDING 0x4
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#undef VLAN_FLAG_MVRP
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#define VLAN_FLAG_MVRP 0x8
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#undef IFLA_VLAN_PROTOCOL
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#define IFLA_VLAN_PROTOCOL 5
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#ifndef IFLA_LINKINFO
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# define IFLA_LINKINFO 18
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# define IFLA_INFO_KIND 1
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#endif
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/* taken from linux/sockios.h */
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#define SIOCSIFNAME 0x8923 /* set interface name */
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/* Exits on error */
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static int get_ctl_fd(void)
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{
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int fd;
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fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (fd >= 0)
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return fd;
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fd = socket(PF_PACKET, SOCK_DGRAM, 0);
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if (fd >= 0)
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return fd;
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return xsocket(PF_INET6, SOCK_DGRAM, 0);
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}
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/* Exits on error */
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static void do_chflags(char *dev, uint32_t flags, uint32_t mask)
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{
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struct ifreq ifr;
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int fd;
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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fd = get_ctl_fd();
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xioctl(fd, SIOCGIFFLAGS, &ifr);
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if ((ifr.ifr_flags ^ flags) & mask) {
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ifr.ifr_flags &= ~mask;
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ifr.ifr_flags |= mask & flags;
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xioctl(fd, SIOCSIFFLAGS, &ifr);
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}
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close(fd);
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}
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/* Exits on error */
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static void do_changename(char *dev, char *newdev)
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{
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struct ifreq ifr;
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int fd;
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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strncpy_IFNAMSIZ(ifr.ifr_newname, newdev);
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fd = get_ctl_fd();
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xioctl(fd, SIOCSIFNAME, &ifr);
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close(fd);
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}
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/* Exits on error */
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static void set_qlen(char *dev, int qlen)
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{
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struct ifreq ifr;
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int s;
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s = get_ctl_fd();
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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ifr.ifr_qlen = qlen;
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xioctl(s, SIOCSIFTXQLEN, &ifr);
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close(s);
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}
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/* Exits on error */
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static void set_mtu(char *dev, int mtu)
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{
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struct ifreq ifr;
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int s;
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s = get_ctl_fd();
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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ifr.ifr_mtu = mtu;
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xioctl(s, SIOCSIFMTU, &ifr);
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close(s);
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}
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/* Exits on error */
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static int get_address(char *dev, int *htype)
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{
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struct ifreq ifr;
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struct sockaddr_ll me;
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socklen_t alen;
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int s;
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s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
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memset(&ifr, 0, sizeof(ifr));
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strncpy_IFNAMSIZ(ifr.ifr_name, dev);
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xioctl(s, SIOCGIFINDEX, &ifr);
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memset(&me, 0, sizeof(me));
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me.sll_family = AF_PACKET;
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me.sll_ifindex = ifr.ifr_ifindex;
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me.sll_protocol = htons(ETH_P_LOOP);
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xbind(s, (struct sockaddr*)&me, sizeof(me));
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alen = sizeof(me);
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getsockname(s, (struct sockaddr*)&me, &alen);
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//never happens:
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//if (getsockname(s, (struct sockaddr*)&me, &alen) == -1)
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// bb_perror_msg_and_die("getsockname");
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close(s);
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*htype = me.sll_hatype;
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return me.sll_halen;
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}
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/* Exits on error */
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static void parse_address(char *dev, int hatype, int halen, char *lla, struct ifreq *ifr)
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{
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int alen;
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memset(ifr, 0, sizeof(*ifr));
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strncpy_IFNAMSIZ(ifr->ifr_name, dev);
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ifr->ifr_hwaddr.sa_family = hatype;
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alen = hatype == 1/*ARPHRD_ETHER*/ ? 14/*ETH_HLEN*/ : 19/*INFINIBAND_HLEN*/;
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alen = ll_addr_a2n((unsigned char *)(ifr->ifr_hwaddr.sa_data), alen, lla);
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if (alen < 0)
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exit(EXIT_FAILURE);
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if (alen != halen) {
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bb_error_msg_and_die("wrong address (%s) length: expected %d bytes", lla, halen);
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}
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}
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/* Exits on error */
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static void set_address(struct ifreq *ifr, int brd)
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{
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int s;
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s = get_ctl_fd();
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if (brd)
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xioctl(s, SIOCSIFHWBROADCAST, ifr);
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else
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xioctl(s, SIOCSIFHWADDR, ifr);
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close(s);
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}
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static void die_must_be_on_off(const char *msg) NORETURN;
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static void die_must_be_on_off(const char *msg)
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{
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bb_error_msg_and_die("argument of \"%s\" must be \"on\" or \"off\"", msg);
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}
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/* Return value becomes exitcode. It's okay to not return at all */
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static int do_set(char **argv)
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{
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char *dev = NULL;
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uint32_t mask = 0;
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uint32_t flags = 0;
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int qlen = -1;
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int mtu = -1;
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char *newaddr = NULL;
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char *newbrd = NULL;
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struct ifreq ifr0, ifr1;
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char *newname = NULL;
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int htype, halen;
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static const char keywords[] ALIGN1 =
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"up\0""down\0""name\0""mtu\0""qlen\0""multicast\0"
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"arp\0""address\0""dev\0";
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enum { ARG_up = 0, ARG_down, ARG_name, ARG_mtu, ARG_qlen, ARG_multicast,
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ARG_arp, ARG_addr, ARG_dev };
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static const char str_on_off[] ALIGN1 = "on\0""off\0";
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enum { PARM_on = 0, PARM_off };
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smalluint key;
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while (*argv) {
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/* substring search ensures that e.g. "addr" and "address"
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* are both accepted */
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key = index_in_substrings(keywords, *argv);
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if (key == ARG_up) {
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mask |= IFF_UP;
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flags |= IFF_UP;
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} else if (key == ARG_down) {
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mask |= IFF_UP;
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flags &= ~IFF_UP;
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} else if (key == ARG_name) {
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NEXT_ARG();
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newname = *argv;
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} else if (key == ARG_mtu) {
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NEXT_ARG();
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if (mtu != -1)
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duparg("mtu", *argv);
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mtu = get_unsigned(*argv, "mtu");
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} else if (key == ARG_qlen) {
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NEXT_ARG();
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if (qlen != -1)
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duparg("qlen", *argv);
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qlen = get_unsigned(*argv, "qlen");
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} else if (key == ARG_addr) {
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NEXT_ARG();
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newaddr = *argv;
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} else if (key >= ARG_dev) {
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if (key == ARG_dev) {
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NEXT_ARG();
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}
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if (dev)
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duparg2("dev", *argv);
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dev = *argv;
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} else {
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int param;
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NEXT_ARG();
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param = index_in_strings(str_on_off, *argv);
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if (key == ARG_multicast) {
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if (param < 0)
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die_must_be_on_off("multicast");
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mask |= IFF_MULTICAST;
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if (param == PARM_on)
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flags |= IFF_MULTICAST;
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else
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flags &= ~IFF_MULTICAST;
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} else if (key == ARG_arp) {
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if (param < 0)
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die_must_be_on_off("arp");
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mask |= IFF_NOARP;
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if (param == PARM_on)
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flags &= ~IFF_NOARP;
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else
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flags |= IFF_NOARP;
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}
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}
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argv++;
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}
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if (!dev) {
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bb_error_msg_and_die(bb_msg_requires_arg, "\"dev\"");
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}
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if (newaddr || newbrd) {
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halen = get_address(dev, &htype);
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if (newaddr) {
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parse_address(dev, htype, halen, newaddr, &ifr0);
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set_address(&ifr0, 0);
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}
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if (newbrd) {
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parse_address(dev, htype, halen, newbrd, &ifr1);
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set_address(&ifr1, 1);
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}
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}
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if (newname && strcmp(dev, newname)) {
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do_changename(dev, newname);
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dev = newname;
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}
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if (qlen != -1) {
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set_qlen(dev, qlen);
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}
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if (mtu != -1) {
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set_mtu(dev, mtu);
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}
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if (mask)
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do_chflags(dev, flags, mask);
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return 0;
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}
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static int ipaddr_list_link(char **argv)
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{
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preferred_family = AF_PACKET;
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return ipaddr_list_or_flush(argv, 0);
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}
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static void vlan_parse_opt(char **argv, struct nlmsghdr *n, unsigned int size)
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{
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static const char keywords[] ALIGN1 =
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"id\0"
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"protocol\0"
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"reorder_hdr\0"
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"gvrp\0"
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"mvrp\0"
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"loose_binding\0"
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;
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static const char protocols[] ALIGN1 =
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"802.1q\0"
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"802.1ad\0"
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;
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static const char str_on_off[] ALIGN1 =
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"on\0"
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"off\0"
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;
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enum {
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ARG_id = 0,
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ARG_reorder_hdr,
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ARG_gvrp,
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ARG_mvrp,
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ARG_loose_binding,
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ARG_protocol,
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};
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enum {
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PROTO_8021Q = 0,
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PROTO_8021AD,
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};
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enum {
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PARM_on = 0,
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PARM_off
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};
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int arg;
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uint16_t id, proto;
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struct ifla_vlan_flags flags = {};
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while (*argv) {
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arg = index_in_substrings(keywords, *argv);
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if (arg < 0)
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invarg(*argv, "type vlan");
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NEXT_ARG();
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if (arg == ARG_id) {
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id = get_u16(*argv, "id");
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addattr_l(n, size, IFLA_VLAN_ID, &id, sizeof(id));
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} else if (arg == ARG_protocol) {
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arg = index_in_substrings(protocols, *argv);
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if (arg == PROTO_8021Q)
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proto = ETH_P_8021Q;
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else if (arg == PROTO_8021AD)
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proto = ETH_P_8021AD;
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else
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bb_error_msg_and_die("unknown VLAN encapsulation protocol '%s'",
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*argv);
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addattr_l(n, size, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto));
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} else {
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int param = index_in_strings(str_on_off, *argv);
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if (param < 0)
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die_must_be_on_off(nth_string(keywords, arg));
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if (arg == ARG_reorder_hdr) {
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flags.mask |= VLAN_FLAG_REORDER_HDR;
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flags.flags &= ~VLAN_FLAG_REORDER_HDR;
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if (param == PARM_on)
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flags.flags |= VLAN_FLAG_REORDER_HDR;
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} else if (arg == ARG_gvrp) {
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flags.mask |= VLAN_FLAG_GVRP;
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flags.flags &= ~VLAN_FLAG_GVRP;
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if (param == PARM_on)
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flags.flags |= VLAN_FLAG_GVRP;
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} else if (arg == ARG_mvrp) {
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flags.mask |= VLAN_FLAG_MVRP;
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flags.flags &= ~VLAN_FLAG_MVRP;
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if (param == PARM_on)
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flags.flags |= VLAN_FLAG_MVRP;
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} else { /*if (arg == ARG_loose_binding) */
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flags.mask |= VLAN_FLAG_LOOSE_BINDING;
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flags.flags &= ~VLAN_FLAG_LOOSE_BINDING;
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if (param == PARM_on)
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flags.flags |= VLAN_FLAG_LOOSE_BINDING;
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}
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}
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argv++;
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}
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if (flags.mask)
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addattr_l(n, size, IFLA_VLAN_FLAGS, &flags, sizeof(flags));
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}
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#ifndef NLMSG_TAIL
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#define NLMSG_TAIL(nmsg) \
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((struct rtattr *) (((void *) (nmsg)) + NLMSG_ALIGN((nmsg)->nlmsg_len)))
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#endif
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/* Return value becomes exitcode. It's okay to not return at all */
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static int do_add_or_delete(char **argv, const unsigned rtm)
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{
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static const char keywords[] ALIGN1 =
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"link\0""name\0""type\0""dev\0";
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enum {
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ARG_link,
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ARG_name,
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ARG_type,
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ARG_dev,
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};
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struct rtnl_handle rth;
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struct {
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struct nlmsghdr n;
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struct ifinfomsg i;
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char buf[1024];
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} req;
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smalluint arg;
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char *name_str = NULL, *link_str = NULL, *type_str = NULL, *dev_str = NULL;
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memset(&req, 0, sizeof(req));
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req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
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req.n.nlmsg_flags = NLM_F_REQUEST;
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req.n.nlmsg_type = rtm;
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req.i.ifi_family = preferred_family;
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if (rtm == RTM_NEWLINK)
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req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
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while (*argv) {
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arg = index_in_substrings(keywords, *argv);
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if (arg == ARG_type) {
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NEXT_ARG();
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type_str = *argv++;
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break;
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}
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if (arg == ARG_link) {
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NEXT_ARG();
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link_str = *argv;
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} else if (arg == ARG_name) {
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NEXT_ARG();
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name_str = *argv;
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} else {
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if (arg == ARG_dev) {
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if (dev_str)
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duparg(*argv, "dev");
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NEXT_ARG();
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}
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dev_str = *argv;
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}
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argv++;
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}
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xrtnl_open(&rth);
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ll_init_map(&rth);
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if (type_str) {
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struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
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addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
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addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type_str,
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strlen(type_str));
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if (*argv) {
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struct rtattr *data = NLMSG_TAIL(&req.n);
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addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
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if (strcmp(type_str, "vlan") == 0)
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vlan_parse_opt(argv, &req.n, sizeof(req));
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data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
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}
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linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
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}
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if (rtm != RTM_NEWLINK) {
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if (!dev_str)
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return 1; /* Need a device to delete */
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req.i.ifi_index = xll_name_to_index(dev_str);
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} else {
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if (!name_str)
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name_str = dev_str;
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if (link_str) {
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int idx = xll_name_to_index(link_str);
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addattr_l(&req.n, sizeof(req), IFLA_LINK, &idx, 4);
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}
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}
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if (name_str) {
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const size_t name_len = strlen(name_str) + 1;
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if (name_len < 2 || name_len > IFNAMSIZ)
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invarg(name_str, "name");
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addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name_str, name_len);
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}
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if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
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return 2;
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return 0;
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}
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/* Return value becomes exitcode. It's okay to not return at all */
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int FAST_FUNC do_iplink(char **argv)
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{
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static const char keywords[] ALIGN1 =
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"add\0""delete\0""set\0""show\0""lst\0""list\0";
|
|
if (*argv) {
|
|
int key = index_in_substrings(keywords, *argv);
|
|
if (key < 0) /* invalid argument */
|
|
invarg(*argv, applet_name);
|
|
argv++;
|
|
if (key <= 1) /* add/delete */
|
|
return do_add_or_delete(argv, key ? RTM_DELLINK : RTM_NEWLINK);
|
|
if (key == 2) /* set */
|
|
return do_set(argv);
|
|
}
|
|
/* show, lst, list */
|
|
return ipaddr_list_link(argv);
|
|
}
|