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[PATCH] net core: Some interface flags not returned by SIOCGIFFLAGS

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Commit b00055aacdb172c05067612278ba27265fcd05ce " [NET] core: add
RFC2863 operstate" defined new interface flag values.  Its
documentation specified that these flags could be accessed from user
space via SIOCGIFFLAGS.  However, this does not work because the new
flags do not fit in that ioctl's argument width.

Change the documentation to match the code's behavior.  Also change
the source to explicitly show the truncation.  This _should_ have no
effect on executable code, and did not with gcc 4.2.4 generating x86
code.

A new ioctl could be defined to return all interface flags to user
space.  However, since this has been broken for three years with no
one complaining, there doesn't seem much need.  They are still
accessible via netlink.

Reported-by:  "Fredrik Arnerup" <fredrik.arnerup@edgeware.tv>
Signed-off-by: John Dykstra <john.dykstra1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Dykstra 2009-06-11 20:57:21 -07:00 committed by David S. Miller
parent 8981f01001
commit 746e6ad23c
2 changed files with 1 additions and 4 deletions
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3
Documentation/networking/operstates.txt
View File

@ -38,9 +38,6 @@ ifinfomsg::if_flags & IFF_LOWER_UP:
ifinfomsg::if_flags & IFF_DORMANT:
Driver has signaled netif_dormant_on()
These interface flags can also be queried without netlink using the
SIOCGIFFLAGS ioctl.
TLV IFLA_OPERSTATE
contains RFC2863 state of the interface in numeric representation:

2
net/core/dev.c
View File

@ -4209,7 +4209,7 @@ static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cm
switch (cmd) {
case SIOCGIFFLAGS: /* Get interface flags */
ifr->ifr_flags = dev_get_flags(dev);
ifr->ifr_flags = (short) dev_get_flags(dev);
return 0;
case SIOCGIFMETRIC: /* Get the metric on the interface