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Miaohe Lin 5055376a3b net: vrf: Fix ping failed when vrf mtu is set to 0 
When the mtu of a vrf device is set to 0, it would cause ping
failed. So I think we should limit vrf mtu in a reasonable range
to solve this problem. I set dev->min_mtu to IPV6_MIN_MTU, so it
will works for both ipv4 and ipv6. And if dev->max_mtu still be 0
can be confusing, so I set dev->max_mtu to ETH_MAX_MTU.

Here is the reproduce step:

1.Config vrf interface and set mtu to 0:
3: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
master vrf1 state UP mode DEFAULT group default qlen 1000
    link/ether 52:54:00:9e:dd:c1 brd ff:ff:ff:ff:ff:ff

2.Ping peer:
3: enp4s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel
master vrf1 state UP group default qlen 1000
    link/ether 52:54:00:9e:dd:c1 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.1/16 scope global enp4s0
       valid_lft forever preferred_lft forever
connect: Network is unreachable

3.Set mtu to default value, ping works:
PING 10.0.0.2 (10.0.0.2) 56(84) bytes of data.
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=1.88 ms

Fixes: ad49bc6361 ("net: vrf: remove MTU limits for vrf device")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-04-07 22:44:02 -07:00
arch RISC-V Patches for 5.1-rc4 2019-04-04 15:04:00 -10:00
block
certs
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Documentation Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-04 18:07:12 -10:00
drivers net: vrf: Fix ping failed when vrf mtu is set to 0 2019-04-07 22:44:02 -07:00
fs cifs: a smb2_validate_and_copy_iov failure does not mean the handle is invalid. 2019-04-01 14:33:38 -05:00
include nfc: nci: Potential off by one in ->pipes[] array 2019-04-06 15:05:07 -07:00
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kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-04 18:07:12 -10:00
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mm mm/compaction.c: abort search if isolation fails 2019-04-04 11:56:15 +01:00
net NFC: nci: Add some bounds checking in nci_hci_cmd_received() 2019-04-06 15:05:07 -07:00
samples
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tools selftests: add a tc matchall test case 2019-04-07 19:31:49 -07:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.