docs: networking: convert ipsec.txt to ReST

Not much to be done here:

- add SPDX header;
- add a document title;
- adjust identation, whitespaces and blank lines;
- add to networking/index.rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 12 insertions, 3 deletions

diff --git a/Documentation/networking/index.rst b/Documentation/networking/index.rst
index 505eaa41ca2b..3efb4608649a 100644
--- a/Documentation/networking/index.rst
+++ b/Documentation/networking/index.rst
@@ -68,6 +68,7 @@ Contents:
    ipddp
    ip_dynaddr
    iphase
+   ipsec
 
 .. only::  subproject and html
 
diff --git a/Documentation/networking/ipsec.txt b/Documentation/networking/ipsec.rst
index ba794b7e51be..afe9d7b48be3 100644
--- a/Documentation/networking/ipsec.txt
+++ b/Documentation/networking/ipsec.rst
@@ -1,12 +1,20 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=====
+IPsec
+=====
+
 
 Here documents known IPsec corner cases which need to be keep in mind when
 deploy various IPsec configuration in real world production environment.
 
-1. IPcomp: Small IP packet won't get compressed at sender, and failed on
+1. IPcomp:
+	   Small IP packet won't get compressed at sender, and failed on
 	   policy check on receiver.
 
-Quote from RFC3173:
-2.2. Non-Expansion Policy
+Quote from RFC3173::
+
+  2.2. Non-Expansion Policy
 
    If the total size of a compressed payload and the IPComp header, as
    defined in section 3, is not smaller than the size of the original