linux-stable.git/Documentation/networking/ip-sysctl.txt, branch v5.3.2

docs: admin-guide: move sysctl directory to it

2019-07-15T14:03:01+00:00

The stuff under sysctl describes /sys interface from userspace
point of view. So, add it to the admin-guide and remove the
:orphan: from its index file.

Signed-off-by: Mauro Carvalho Chehab

docs: sysctl: convert to ReST

2019-07-15T12:20:26+00:00

Rename the /proc/sys/ documentation files to ReST, using the
README file as a template for an index.rst, adding the other
files there via TOC markup.

Despite being written on different times with different
styles, try to make them somewhat coherent with a similar
look and feel, ensuring that they'll look nice as both
raw text file and as via the html output produced by the
Sphinx build system.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab

ipv6: Support multipath hashing on inner IP pkts

2019-07-08T23:37:29+00:00

Make the same support as commit 363887a2cdfe ("ipv4: Support multipath
hashing on inner IP pkts for GRE tunnel") for outer IPv6. The hashing
considers both IPv4 and IPv6 pkts when they are tunneled by IPv6 GRE.

Signed-off-by: Stephen Suryaputra 
Signed-off-by: David S. Miller

ipv6: icmp: allow flowlabel reflection in echo replies

2019-07-01T17:54:51+00:00

Extend flowlabel_reflect bitmask to allow conditional
reflection of incoming flowlabels in echo replies.

Note this has precedence against auto flowlabels.

Add flowlabel_reflect enum to replace hard coded
values.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2019-06-18T03:20:36+00:00

Honestly all the conflicts were simple overlapping changes,
nothing really interesting to report.

Signed-off-by: David S. Miller

tcp: add tcp_min_snd_mss sysctl

2019-06-16T01:47:31+00:00

Some TCP peers announce a very small MSS option in their SYN and/or
SYN/ACK messages.

This forces the stack to send packets with a very high network/cpu
overhead.

Linux has enforced a minimal value of 48. Since this value includes
the size of TCP options, and that the options can consume up to 40
bytes, this means that each segment can include only 8 bytes of payload.

In some cases, it can be useful to increase the minimal value
to a saner value.

We still let the default to 48 (TCP_MIN_SND_MSS), for compatibility
reasons.

Note that TCP_MAXSEG socket option enforces a minimal value
of (TCP_MIN_MSS). David Miller increased this minimal value
in commit c39508d6f118 ("tcp: Make TCP_MAXSEG minimum more correct.")
from 64 to 88.

We might in the future merge TCP_MIN_SND_MSS and TCP_MIN_MSS.

CVE-2019-11479 -- tcp mss hardcoded to 48

Signed-off-by: Eric Dumazet 
Suggested-by: Jonathan Looney 
Acked-by: Neal Cardwell 
Cc: Yuchung Cheng 
Cc: Tyler Hicks 
Cc: Bruce Curtis 
Cc: Jonathan Lemon 
Signed-off-by: David S. Miller

tcp: add tcp_rx_skb_cache sysctl

2019-06-15T03:18:28+00:00

Instead of relying on rps_needed, it is safer to use a separate
static key, since we do not want to enable TCP rx_skb_cache
by default. This feature can cause huge increase of memory
usage on hosts with millions of sockets.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

ipv4: Support multipath hashing on inner IP pkts for GRE tunnel

2019-06-15T02:42:35+00:00

Multipath hash policy value of 0 isn't distributing since the outer IP
dest and src aren't varied eventhough the inner ones are. Since the flow
is on the inner ones in the case of tunneled traffic, hashing on them is
desired.

This is done mainly for IP over GRE, hence only tested for that. But
anything else supported by flow dissection should work.

v2: Use skb_flow_dissect_flow_keys() directly so that other tunneling
    can be supported through flow dissection (per Nikolay Aleksandrov).
v3: Remove accidental inclusion of ports in the hash keys and clarify
    the documentation (Nikolay Alexandrov).
Signed-off-by: Stephen Suryaputra 
Signed-off-by: Nikolay Aleksandrov 
Signed-off-by: David S. Miller

ipv6: tcp: enable flowlabel reflection in some RST packets

2019-06-06T02:05:01+00:00

When RST packets are sent because no socket could be found,
it makes sense to use flowlabel_reflect sysctl to decide
if a reflection of the flowlabel is requested.

This extends commit 22b6722bfa59 ("ipv6: Add sysctl for per
namespace flow label reflection"), for some TCP RST packets.

In order to provide full control of this new feature,
flowlabel_reflect becomes a bitmask.

Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

Documentation: ip-sysctl.txt: Document tcp_fastopen_key

2019-05-30T20:41:26+00:00

Add docs for /proc/sys/net/ipv4/tcp_fastopen_key

Signed-off-by: Jason Baron 
Signed-off-by: Christoph Paasch 
Cc: Jeremy Sowden 
Acked-by: Yuchung Cheng 
Signed-off-by: David S. Miller