[PATCH net-next v10 05/10] ipv6: Document defaults for max_{dst|hbh}_opts_number sysctls

[Tom Herbert <tom@herbertland.com>]

From: Tom Herbert <tom@herbertland.com>

In the descriptions of max_dst_opts_number and max_hbh_opts_number
sysctls add text about how a zero setting means that a packet with
any Destination or Hop-by-Hop options is dropped.

Report the defaults for max_dst_opts_number and max_hbh_opts_number
are 2 which means up to two options may be accepted.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Reviewed-by: Justin Iurman <justin.iurman@gmail.com>
---
 Documentation/networking/ip-sysctl.rst | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 2e3a746fcc6d..453643c70c8d 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2511,19 +2511,25 @@ mld_qrv - INTEGER
 
 max_dst_opts_number - INTEGER
 	Maximum number of non-padding TLVs allowed in a Destination
-	options extension header. If this value is less than zero
-	then unknown options are disallowed and the number of known
-	TLVs allowed is the absolute value of this number.
+	options extension header. If this value is zero then receive
+	Destination Options processing is disabled in which case packets
+	with the Destination Options extension header are dropped. If
+	this value is less than zero then unknown options are disallowed
+	and the number of known TLVs allowed is the absolute value of
+	this number.
 
-	Default: 8
+	Default: 2
 
 max_hbh_opts_number - INTEGER
 	Maximum number of non-padding TLVs allowed in a Hop-by-Hop
-	options extension header. If this value is less than zero
-	then unknown options are disallowed and the number of known
-	TLVs allowed is the absolute value of this number.
+	options extension header. If this value is zero then receive
+	Hop-by-Hop Options processing is disabled in which case packets
+	with the Hop-by-Hop Options extension header are dropped.
+	If this value is less than zero then unknown options are disallowed
+	and the number of known TLVs allowed is the absolute value of this
+	number.
 
-	Default: 8
+	Default: 2
 
 max_dst_opts_length - INTEGER
 	Maximum length allowed for a Destination options extension
-- 
2.43.0