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patch setting MTU on tap interface

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* src/bridge.c: patch setting MTU on tap interface to be the same
  as the value for the bridge (Eduardo Habkost)
daniel
This commit is contained in:
Daniel Veillard 2008-12-04 14:38:31 +00:00
parent f9d77feca9
commit 4fc29fa9f4
2 changed files with 101 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Thu Dec 4 15:36:42 CET 2008 Daniel Veillard <veillard@redhat.com>
* src/bridge.c: patch setting MTU on tap interface to be the same
as the value for the bridge (Eduardo Habkost)
Thu 4 Dec 2008 12:46:01 CET Guido Günther <agx@sigxcpu.org>
Differentiate between active and inactive configs by honoring the

96
src/bridge.c
View File

@ -275,6 +275,96 @@ brDeleteInterface(brControl *ctl ATTRIBUTE_UNUSED,
}
#endif
/**
* ifGetMtu
* @ctl: bridge control pointer
* @ifname: interface name get MTU for
*
* This function gets the @mtu value set for a given interface @ifname.
*
* Returns the MTU value in case of success.
* On error, returns -1 and sets errno accordingly
*/
static int ifGetMtu(brControl *ctl, const char *ifname)
{
struct ifreq ifr;
int len;
if (!ctl || !ifname) {
errno = EINVAL;
return -1;
}
if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN) {
errno = EINVAL;
return -1;
}
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, ifname, len);
ifr.ifr_name[len] = '\0';
if (ioctl(ctl->fd, SIOCGIFMTU, &ifr))
return -1;
return ifr.ifr_mtu;
}
/**
* ifSetMtu:
* @ctl: bridge control pointer
* @ifname: interface name to set MTU for
* @mtu: MTU value
*
* This function sets the @mtu for a given interface @ifname. Typically
* used on a tap device to set up for Jumbo Frames.
*
* Returns 0 in case of success or an errno code in case of failure.
*/
static int ifSetMtu(brControl *ctl, const char *ifname, int mtu)
{
struct ifreq ifr;
int len;
if (!ctl || !ifname)
return EINVAL;
if ((len = strlen(ifname)) >= BR_IFNAME_MAXLEN)
return EINVAL;
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, ifname, len);
ifr.ifr_name[len] = '\0';
ifr.ifr_mtu = mtu;
return ioctl(ctl->fd, SIOCSIFMTU, &ifr) == 0 ? 0 : errno;
}
/**
* brSetInterfaceMtu
* @ctl: bridge control pointer
* @bridge: name of the bridge interface
* @ifname: name of the interface whose MTU we want to set
*
* Sets the interface mtu to the same MTU of the bridge
*
* Returns 0 in case of success or an errno code in case of failure.
*/
static int brSetInterfaceMtu(brControl *ctl,
const char *bridge,
const char *ifname)
{
int mtu = ifGetMtu(ctl, bridge);
if (mtu < 0)
return errno;
return ifSetMtu(ctl, ifname, mtu);
}
/**
* brAddTap:
* @ctl: bridge control pointer
@ -334,6 +424,12 @@ brAddTap(brControl *ctl,
}
if (ioctl(fd, TUNSETIFF, &try) == 0) {
/* We need to set the interface MTU before adding it
* to the bridge, because the bridge will have its
* MTU adjusted automatically when we add the new interface.
*/
if ((errno = brSetInterfaceMtu(ctl, bridge, try.ifr_name)))
goto error;
if ((errno = brAddInterface(ctl, bridge, try.ifr_name)))
goto error;
if ((errno = brSetInterfaceUp(ctl, try.ifr_name, 1)))