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https://gitlab.com/libvirt/libvirt.git
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49dcc264e5
* qemud/qemud.c, qemud/bridge.c, qemud/iptables.c: fix our FD_CLOEXEC usage so that all fds which should be closed on exec are marked as such and that we leave exec() to do the actual closing.
618 lines
13 KiB
C
618 lines
13 KiB
C
/*
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* Copyright (C) 2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors:
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* Mark McLoughlin <markmc@redhat.com>
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*/
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#include <config.h>
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#include "bridge.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <linux/param.h> /* HZ */
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#include <linux/sockios.h> /* SIOCBRADDBR etc. */
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#include <linux/if_bridge.h> /* SYSFS_BRIDGE_ATTR */
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#include <linux/if_tun.h> /* IFF_TUN, IFF_NO_PI */
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#include "internal.h"
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#define MAX_BRIDGE_ID 256
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#define JIFFIES_TO_MS(j) (((j)*1000)/HZ)
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#define MS_TO_JIFFIES(ms) (((ms)*HZ)/1000)
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struct _brControl {
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int fd;
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};
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int
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brInit(brControl **ctlp)
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{
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int fd;
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int flags;
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if (!ctlp || *ctlp)
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return EINVAL;
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0)
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return errno;
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if ((flags = fcntl(fd, F_GETFD)) < 0 ||
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fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
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int err = errno;
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close(fd);
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return err;
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}
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*ctlp = (brControl *)malloc(sizeof(struct _brControl));
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if (!*ctlp)
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return ENOMEM;
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(*ctlp)->fd = fd;
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return 0;
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}
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void
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brShutdown(brControl *ctl)
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{
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if (!ctl)
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return;
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close(ctl->fd);
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ctl->fd = 0;
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free(ctl);
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}
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int
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brAddBridge(brControl *ctl,
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const char *nameOrFmt,
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char *name,
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int maxlen)
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{
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int id, subst;
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if (!ctl || !ctl->fd || !nameOrFmt || !name)
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return EINVAL;
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if (maxlen >= BR_IFNAME_MAXLEN)
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maxlen = BR_IFNAME_MAXLEN;
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subst = id = 0;
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if (strstr(nameOrFmt, "%d"))
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subst = 1;
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do {
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char try[BR_IFNAME_MAXLEN];
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int len;
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if (subst) {
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len = snprintf(try, maxlen, nameOrFmt, id);
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if (len >= maxlen)
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return EADDRINUSE;
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} else {
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len = strlen(nameOrFmt);
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if (len >= maxlen - 1)
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return EINVAL;
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strncpy(try, nameOrFmt, len);
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try[len] = '\0';
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}
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if (ioctl(ctl->fd, SIOCBRADDBR, try) == 0) {
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strncpy(name, try, maxlen);
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return 0;
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}
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id++;
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} while (subst && id <= MAX_BRIDGE_ID);
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return errno;
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}
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int
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brDeleteBridge(brControl *ctl,
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const char *name)
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{
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if (!ctl || !ctl->fd || !name)
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return EINVAL;
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return ioctl(ctl->fd, SIOCBRDELBR, name) == 0 ? 0 : errno;
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}
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static int
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brAddDelInterface(brControl *ctl,
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int cmd,
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const char *bridge,
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const char *iface)
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{
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struct ifreq ifr;
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int len;
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if (!ctl || !ctl->fd || !bridge || !iface)
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return EINVAL;
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if ((len = strlen(bridge)) >= BR_IFNAME_MAXLEN)
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return EINVAL;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, bridge, len);
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ifr.ifr_name[len] = '\0';
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if (!(ifr.ifr_ifindex = if_nametoindex(iface)))
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return ENODEV;
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return ioctl(ctl->fd, cmd, &ifr) == 0 ? 0 : errno;
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}
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int
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brAddInterface(brControl *ctl,
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const char *bridge,
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const char *iface)
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{
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return brAddDelInterface(ctl, SIOCBRADDIF, bridge, iface);
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}
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int
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brDeleteInterface(brControl *ctl,
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const char *bridge,
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const char *iface)
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{
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return brAddDelInterface(ctl, SIOCBRDELIF, bridge, iface);
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}
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int
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brAddTap(brControl *ctl,
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const char *bridge,
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const char *ifnameOrFmt,
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char *ifname,
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int maxlen,
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int *tapfd)
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{
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int id, subst, fd;
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if (!ctl || !ctl->fd || !bridge || !ifnameOrFmt || !tapfd)
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return EINVAL;
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if (!ifname)
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maxlen = BR_IFNAME_MAXLEN;
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else if (maxlen >= BR_IFNAME_MAXLEN)
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maxlen = BR_IFNAME_MAXLEN;
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subst = id = 0;
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if (strstr(ifnameOrFmt, "%d"))
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subst = 1;
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if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
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return errno;
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do {
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struct ifreq try;
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int len;
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memset(&try, 0, sizeof(struct ifreq));
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try.ifr_flags = IFF_TAP|IFF_NO_PI;
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if (subst) {
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len = snprintf(try.ifr_name, maxlen, ifnameOrFmt, id);
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if (len >= maxlen) {
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errno = EADDRINUSE;
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goto error;
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}
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} else {
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len = strlen(ifnameOrFmt);
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if (len >= maxlen - 1) {
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errno = EINVAL;
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goto error;
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}
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strncpy(try.ifr_name, ifnameOrFmt, len);
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try.ifr_name[len] = '\0';
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}
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if (ioctl(fd, TUNSETIFF, &try) == 0) {
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if ((errno = brAddInterface(ctl, bridge, try.ifr_name)))
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goto error;
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if ((errno = brSetInterfaceUp(ctl, try.ifr_name, 1)))
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goto error;
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if (ifname)
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strncpy(ifname, try.ifr_name, maxlen);
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*tapfd = fd;
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return 0;
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}
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id++;
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} while (subst && id <= MAX_BRIDGE_ID);
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error:
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close(fd);
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return errno;
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}
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int
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brSetInterfaceUp(brControl *ctl,
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const char *ifname,
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int up)
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{
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struct ifreq ifr;
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int len;
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int flags;
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if (!ctl || !ifname)
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return EINVAL;
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if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN)
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return EINVAL;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, ifname, len);
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ifr.ifr_name[len] = '\0';
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if (ioctl(ctl->fd, SIOCGIFFLAGS, &ifr) < 0)
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return errno;
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flags = up ? (ifr.ifr_flags | IFF_UP) : (ifr.ifr_flags & ~IFF_UP);
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if (ifr.ifr_flags != flags) {
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ifr.ifr_flags = flags;
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if (ioctl(ctl->fd, SIOCSIFFLAGS, &ifr) < 0)
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return errno;
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}
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return 0;
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}
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int
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brGetInterfaceUp(brControl *ctl,
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const char *ifname,
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int *up)
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{
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struct ifreq ifr;
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int len;
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if (!ctl || !ifname)
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return EINVAL;
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if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN)
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return EINVAL;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, ifname, len);
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ifr.ifr_name[len] = '\0';
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if (ioctl(ctl->fd, SIOCGIFFLAGS, &ifr) < 0)
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return errno;
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*up = (ifr.ifr_flags & IFF_UP) ? 1 : 0;
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return 0;
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}
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static int
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brSetInetAddr(brControl *ctl,
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const char *ifname,
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int cmd,
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const char *addr)
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{
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struct ifreq ifr;
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struct in_addr inaddr;
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int len, ret;
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if (!ctl || !ctl->fd || !ifname || !addr)
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return EINVAL;
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if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN)
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return EINVAL;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, ifname, len);
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ifr.ifr_name[len] = '\0';
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if ((ret = inet_pton(AF_INET, addr, &inaddr)) < 0)
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return errno;
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else if (ret == 0)
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return EINVAL;
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((struct sockaddr_in *)&ifr.ifr_addr)->sin_family = AF_INET;
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((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr = inaddr;
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if (ioctl(ctl->fd, cmd, &ifr) < 0)
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return errno;
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return 0;
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}
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static int
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brGetInetAddr(brControl *ctl,
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const char *ifname,
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int cmd,
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char *addr,
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int maxlen)
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{
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struct ifreq ifr;
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struct in_addr *inaddr;
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int len;
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if (!ctl || !ctl->fd || !ifname || !addr)
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return EINVAL;
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if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN)
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return EINVAL;
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, ifname, len);
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ifr.ifr_name[len] = '\0';
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if (ioctl(ctl->fd, cmd, &ifr) < 0)
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return errno;
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if (maxlen < BR_INET_ADDR_MAXLEN || ifr.ifr_addr.sa_family != AF_INET)
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return EFAULT;
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inaddr = &((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
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if (!inet_ntop(AF_INET, inaddr, addr, maxlen))
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return errno;
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return 0;
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}
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int
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brSetInetAddress(brControl *ctl,
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const char *ifname,
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const char *addr)
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{
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return brSetInetAddr(ctl, ifname, SIOCSIFADDR, addr);
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}
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int
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brGetInetAddress(brControl *ctl,
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const char *ifname,
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char *addr,
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int maxlen)
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{
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return brGetInetAddr(ctl, ifname, SIOCGIFADDR, addr, maxlen);
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}
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int
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brSetInetNetmask(brControl *ctl,
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const char *ifname,
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const char *addr)
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{
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return brSetInetAddr(ctl, ifname, SIOCSIFNETMASK, addr);
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}
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int
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brGetInetNetmask(brControl *ctl,
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const char *ifname,
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char *addr,
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int maxlen)
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{
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return brGetInetAddr(ctl, ifname, SIOCGIFNETMASK, addr, maxlen);
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}
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#ifdef ENABLE_BRIDGE_PARAMS
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#include <sysfs/libsysfs.h>
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static int
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brSysfsPrep(struct sysfs_class_device **dev,
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struct sysfs_attribute **attr,
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const char *bridge,
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const char *attrname)
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{
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*dev = NULL;
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*attr = NULL;
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if (!(*dev = sysfs_open_class_device("net", bridge)))
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return errno;
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if (!(*attr = sysfs_get_classdev_attr(*dev, attrname))) {
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int err = errno;
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sysfs_close_class_device(*dev);
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*dev = NULL;
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return err;
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}
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return 0;
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}
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static int
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brSysfsWriteInt(struct sysfs_attribute *attr,
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int value)
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{
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char buf[32];
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int len;
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len = snprintf(buf, sizeof(buf), "%d\n", value);
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if (len > (int)sizeof(buf))
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len = sizeof(buf); /* paranoia, shouldn't happen */
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return sysfs_write_attribute(attr, buf, len) == 0 ? 0 : errno;
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}
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int
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brSetForwardDelay(brControl *ctl,
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const char *bridge,
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int delay)
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{
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struct sysfs_class_device *dev;
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struct sysfs_attribute *attr;
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int err = 0;
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if (!ctl || !bridge)
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return EINVAL;
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if ((err = brSysfsPrep(&dev, &attr, bridge, SYSFS_BRIDGE_ATTR "/forward_delay")))
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return err;
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err = brSysfsWriteInt(attr, MS_TO_JIFFIES(delay));
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sysfs_close_class_device(dev);
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return err;
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}
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int
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brGetForwardDelay(brControl *ctl,
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const char *bridge,
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int *delayp)
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{
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struct sysfs_class_device *dev;
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struct sysfs_attribute *attr;
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int err = 0;
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if (!ctl || !bridge || !delayp)
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return EINVAL;
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if ((err = brSysfsPrep(&dev, &attr, bridge, SYSFS_BRIDGE_ATTR "/forward_delay")))
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return err;
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*delayp = strtoul(attr->value, NULL, 0);
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if (errno != ERANGE) {
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*delayp = JIFFIES_TO_MS(*delayp);
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} else {
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err = errno;
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}
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sysfs_close_class_device(dev);
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return err;
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}
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int
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brSetEnableSTP(brControl *ctl,
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const char *bridge,
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int enable)
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{
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struct sysfs_class_device *dev;
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struct sysfs_attribute *attr;
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int err = 0;
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if (!ctl || !bridge)
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return EINVAL;
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if ((err = brSysfsPrep(&dev, &attr, bridge, SYSFS_BRIDGE_ATTR "/stp_state")))
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return err;
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err = brSysfsWriteInt(attr, (enable == 0) ? 0 : 1);
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sysfs_close_class_device(dev);
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return err;
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}
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int
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brGetEnableSTP(brControl *ctl,
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const char *bridge,
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int *enablep)
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{
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struct sysfs_class_device *dev;
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struct sysfs_attribute *attr;
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int err = 0;
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if (!ctl || !bridge || !enablep)
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return EINVAL;
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if ((err = brSysfsPrep(&dev, &attr, bridge, SYSFS_BRIDGE_ATTR "/stp_state")))
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return err;
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*enablep = strtoul(attr->value, NULL, 0);
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if (errno != ERANGE) {
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*enablep = (*enablep == 0) ? 0 : 1;
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} else {
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err = errno;
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}
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sysfs_close_class_device(dev);
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return err;
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}
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#else /* ENABLE_BRIDGE_PARAMS */
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int
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brSetForwardDelay(brControl *ctl ATTRIBUTE_UNUSED,
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const char *bridge ATTRIBUTE_UNUSED,
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int delay ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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int
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brGetForwardDelay(brControl *ctl ATTRIBUTE_UNUSED,
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const char *bridge ATTRIBUTE_UNUSED,
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int *delay ATTRIBUTE_UNUSED)
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{
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return 0;
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}
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int
|
|
brSetEnableSTP(brControl *ctl ATTRIBUTE_UNUSED,
|
|
const char *bridge ATTRIBUTE_UNUSED,
|
|
int enable ATTRIBUTE_UNUSED)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
brGetEnableSTP(brControl *ctl ATTRIBUTE_UNUSED,
|
|
const char *bridge ATTRIBUTE_UNUSED,
|
|
int *enable ATTRIBUTE_UNUSED)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* ENABLE_BRIDGE_PARAMS */
|
|
|
|
/*
|
|
* Local variables:
|
|
* indent-tabs-mode: nil
|
|
* c-indent-level: 4
|
|
* c-basic-offset: 4
|
|
* tab-width: 4
|
|
* End:
|
|
*/
|