Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>

I repeatedly failed to get this right, so now I have to clean up my mess
afterwards.

Fixes: 7d6aadcd ("ip{,6}tunnel: have a shared stats parser/printer")
Signed-off-by: Phil Sutter <phil@nwl.cc>

This has a slight side-effect of not aborting when /proc/net/dev is
malformed, but OTOH stats are not parsed for uninteresting interfaces.
Signed-off-by: Phil Sutter <phil@nwl.cc>

Currently ip6 encap support for lwtunnel is missing.
This patch implement it, mostly duplicating the ipv4 parts.

Also be sure to insert a space after the encap type, when
showing lwtunnel, to avoid the tunnel type and the following
argument being merged into a single word.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

This patch add support for IFLA_GRE_COLLECT_METADATA via the
'external' keyword to the gre link.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

This patch add support for IFLA_VXLAN_COLLECT_METADATA via the
'external' keyword to the vxlan link.

Also enforce mutual exclusion between 'vni' and 'external'.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>

Fix a whitespace in bpf_dump_error() usage, and also a missing closing
bracket in ntohl() macro for eBPF programs.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

Current headers for net-next

Currently parse_encap_ip() does not update correctly argv/argc;
if multiple lwtunnel arguments are provided, the parsing fails after
the first one, i.e.

 ip route add 172.16.101.0/24 dev vxlan1 encap ip id 42 dst 192.168.255.1

fails with:

 Error: either "to" is duplicate, or "dst" is a garbage.

This commit addresses the issue, stepping to next argument at each iteration
of the parsing loop.

Fixes: 1e529305 ("lwtunnel: Add encapsulation support to ip route")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Commit 0f754332 ("route: ignore RTAX_HOPLIMIT of value -1")
accidentally reordered fprintf statements. This patch restores the
original ordering.

Fixes: 0f754332 ("route: ignore RTAX_HOPLIMIT of value -1")
Signed-off-by: Phil Sutter <phil@nwl.cc>

Though dumping such entries crashes present kernels.
Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>

This patch:
 - Adds a utility function for parsing a 64 bit address
 - Adds a utility function for converting a 64 bit address to ASCII
 - Adds and ILA encap type in lwt tunnels
Signed-off-by: Tom Herbert <tom@herbertland.com>

Improve example files further and add a more generic set of possible
helpers for them that can be used.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

The tunnel code was doing sscanf(buf, "%ld", &x) where x was unsigned
long.

Just a typo there, it's spelled correctly in SEE ALSO section..
Signed-off-by: Phil Sutter <phil@nwl.cc>

Currently, the table id for VRF devices requires an integer. Convert
it to use rtnl_rttable_a2n which handles table names from the iproute2
directory.

This also fixes a bug in the original commit where table name are not
properly handled.

Fixes: 15faa0a3 ("add support for VRF device")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>

There is two variables named 'len' in rtnl_talk. In fact, commit
c079e121 didn't work. For example, it was possible to trigger
a seg fault with this command:
$ ip link set gre2 type ip6gre hoplimit 32

Let's rename the argument len to maxlen.

Fixes: c079e121 ("libnetlink: add size argument to rtnl_talk")
Reported-by: Thomas Faivre <thomas.faivre@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>

Older kernels use -1 internally as indicator to use the sysctl default,
but they still export the setting. Newer kernels use 0 to indicate that
(which is why the conversion from -1 to 0 was done here), but they also
stopped exporting the value. Since the meaning of -1 is clear, treat it
equally like default on newer kernels (which is to not print anything).
Signed-off-by: Phil Sutter <phil@nwl.cc>

Make iptunnel pass checkpatch (mostly).

On 24.11.2015 02:26, Stephen Hemminger wrote:
> On Thu, 12 Nov 2015 21:10:08 +0000
> Konstantin Shemyak <konstantin@shemyak.com> wrote:
>
>> When creating an IP tunnel over IPv6, the address family must be passed in
>> the option, e.g.
>>
>> ip -6 tunnel add mode ip6gre local 1::1 remote 2::2
>>
>> This makes it impossible to create both IPv4 and IPv6 tunnels in one batch.
>>
>> In fact the address family option is redundant here, as each tunnel mode is
>> relevant for only one address family.
>> The patch determines whether the applicable address family is AF_INET6
>> instead of the default AF_INET and makes the "-6" option unnecessary for
>> "ip tunnel add".
>>
>> Signed-off-by: Konstantin Shemyak <konstantin@shemyak.com>
>> ---
>>   ip/iptunnel.c                          | 26 ++++++++++++++++++++++++++
>>   testsuite/tests/ip/tunnel/add_tunnel.t | 14 ++++++++++++++
>>   2 files changed, 40 insertions(+)
>>   create mode 100755 testsuite/tests/ip/tunnel/add_tunnel.t
>>
>> diff --git a/ip/iptunnel.c b/ip/iptunnel.c
>> index 78fa988..7826a37 100644
>> --- a/ip/iptunnel.c
>> +++ b/ip/iptunnel.c
>> @@ -629,8 +629,34 @@ static int do_6rd(int argc, char **argv)
>>          return tnl_6rd_ioctl(cmd, medium, &ip6rd);
>>   }
>>
>> +static int tunnel_mode_is_ipv6(char *tunnel_mode) {
>> +       char *ipv6_modes[] = {
>> +               "ipv6/ipv6", "ip6ip6",
>> +               "vti6",
>> +               "ip/ipv6", "ipv4/ipv6", "ipip6", "ip4ip6",
>> +               "ip6gre", "gre/ipv6",
>> +               "any/ipv6", "any"
>> +       };
>> +       int i;
>> +
>> +       for (i = 0; i < sizeof(ipv6_modes) / sizeof(char *); i++) {
>> +               if (strcmp(ipv6_modes[i], tunnel_mode) == 0)
>> +                       return 1;
>> +       }
>> +       return 0;
>> +}
>> +
>
> The ipv6_modes table should be static const.

Thank you for the note! attached the corrected patch.

> Also is it possible to use strstr for ipv6 and ip6 or even strchr(tunnel_mode, '6')
> to simplify this?

There is IPv6 tunnel mode 'any', and IPv4 tunnel mode 'ipv6/ip' (aka
'sit'). It looks to me that attempts to find some substring match
would not make the code much shorter, but definitely less readable.

Konstantin Shemyak.

>From 42d27db0055c3a114fe6eb86d680bef9ec098ad4 Mon Sep 17 00:00:00 2001
From: Konstantin Shemyak <konstantin@shemyak.com>
Date: Thu, 12 Nov 2015 20:52:02 +0200
Subject: [PATCH] Tunnel address family is determined from the tunnel mode

When the tunnel mode already tells the IP address family, "ip tunnel"
command determines it and does not require option "-4"/"-6" to be passed.

This makes possible creating both IPv4 and IPv6 tunnels in one batch.
Signed-off-by: Konstantin Shemyak <konstantin@shemyak.com>

I've added three examples to examples/bpf/ that demonstrate how one can
implement eBPF tail calls in tc with f.e. multiple levels of nesting.
That should act as a good starting point, but also as test cases for the
ELF loader and kernel. A real test suite for {f,m,e}_bpf is still to be
developed in future work.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Since we have all infrastructure in place now, allow atomic live updates
on program arrays. This can be very useful e.g. in case programs that are
being tail-called need to be replaced, f.e. when classifier functionality
needs to be changed, new protocols added/removed during runtime, etc.

Thus, provide a way for in-place code updates, minimal example: Given is
an object file cls.o that contains the entry point in section 'classifier',
has a globally pinned program array 'jmp' with 2 slots and id of 0, and
two tail called programs under section '0/0' (prog array key 0) and '0/1'
(prog array key 1), the section encoding for the loader is <id/key>.
Adding the filter loads everything into cls_bpf:

  tc filter add dev foo parent ffff: bpf da obj cls.o

Now, the program under section '0/1' needs to be replaced with an updated
version that resides in the same section (also full path to tc's subfolder
of the mount point can be passed, e.g. /sys/fs/bpf/tc/globals/jmp):

  tc exec bpf graft m:globals/jmp obj cls.o sec 0/1

In case the program resides under a different section 'foo', it can also
be injected into the program array like:

  tc exec bpf graft m:globals/jmp key 1 obj cls.o sec foo

If the new tail called classifier program is already available as a pinned
object somewhere (here: /sys/fs/bpf/tc/progs/parser), it can be injected
into the prog array like:

  tc exec bpf graft m:globals/jmp key 1 fd m:progs/parser

In the kernel, the program on key 1 is being atomically replaced and the
old one's refcount dropped.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

The recently introduced object pinning can be further extended in order
to allow sharing maps beyond tc namespace. F.e. maps that are being pinned
from tracing side, can be accessed through this facility as well.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Make use of the new show_fdinfo() facility and verify that when a
pinned map is being fetched that its basic attributes are the same
as the map we declared from the ELF file. I.e. when placed into the
globalns, collisions could occur. In such a case warn the user and
bail out.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Now that we have the possibility of sharing maps, it's time we get the
ELF loader fully working with regards to tail calls. Since program array
maps are pinned, we can keep them finally alive. I've noticed two bugs
that are being fixed in bpf_fill_prog_arrays() with this patch. Example
code comes as follow-up.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

This patch adds support to remote checksum checksum offload
to VXLAN. This patch adds remcsumtx and remcsumrx to ip vxlan
configuration to enable remote checksum offload for transmit
and receive on the VXLAN tunnel.

https://tools.ietf.org/html/draft-herbert-vxlan-rco-00

Example:

ip link add name vxlan0 type vxlan id 42 group 239.1.1.1 dev eth0 \
    udpcsum remcsumtx remcsumrx

Testing:

Ran single netperf over mlnx4 to illustrate the effest:

- Without RCO (UDP csum set to zero)
  4335.99 Mbps
- With RCO enabled
  7661.81 Mbps
Signed-off-by: Tom Herbert <tom@herbertland.com>

fgets() will read at most size-1 bytes into the buffer and add a
terminating null-char at the end. Therefore it is not necessary to pass
a reduced buffer size when calling it.

This change was generated using the following semantic patch:

@@
identifier buf, fp;
@@
- fgets(buf, sizeof(buf) - 1, fp)
+ fgets(buf, sizeof(buf), fp)
Signed-off-by: Phil Sutter <phil@nwl.cc>

Although not fundamentally necessary to check return codes in these
spots, preventing the warnings will put new ones into focus.
Signed-off-by: Phil Sutter <phil@nwl.cc>

No need to keep static port boundaries global, they are not used
directly. Keeping them local also allows to safely reduce their names to
the minimum. Assign hardcoded fallback values also if fscanf() fails.
Get rid of unnecessary braces around return parameter.

Instead of more or less duplicating is_ephemeral() in run_ssfilter(),
simply call the function instead.
Signed-off-by: Phil Sutter <phil@nwl.cc>

Exit early or continue on error instead of putting conditional into
conditional to make reading the code a bit easier.

Also, the call to memcpy() can be skipped by initialising prog with the
desired prefix.
Signed-off-by: Phil Sutter <phil@nwl.cc>

Instead of calling rewind() and fgets() before every call to
scan_lines(), move them into scan_lines() itself.

This should also fix compat mode, as before the second call to
scan_lines() the first line was skipped unconditionally.
Signed-off-by: Phil Sutter <phil@nwl.cc>

- Replace commas at end of subsection with dots.
- Replace double whitespace by single one.
Signed-off-by: Phil Sutter <phil@nwl.cc>

Technically, the range of possible hoplimit values are defined by IPv4
and IPv6 header formats. Both define the field to be eight bits in size,
which leads to a value range of [0;255]. Setting a packet's hoplimit
field to 0 though makes not much sense, as the next hop would
immediately drop the packet. Therefore Linux uses 0 as a special value
indicating to use the system's default hoplimit (configurable via
sysctl). In iproute, setting the hoplimit of a route to 0 is equivalent
to omitting the hoplimit parameter alltogether, so it is actually not
necessary to allow that value to be specified, but keep it anyway for
backwards compatibility.
Signed-off-by: Phil Sutter <phil@nwl.cc>