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authorIdo Schimmel <idosch@OSS.NVIDIA.COM>2021-05-17 21:15:22 +0300
committerDavid S. Miller <davem@davemloft.net>2021-05-18 13:27:32 -0700
commited13923f980ef84dde0b9010b9e09052dc31a909 (patch)
treec93208287485abcfd73fdb30abb374b70cb5f239 /Documentation
parentb95b6e072a92042320fad99de658008cc0beb3b0 (diff)
downloadlinux-ed13923f980ef84dde0b9010b9e09052dc31a909.tar.bz2
ipv6: Add a sysctl to control multipath hash fields
A subsequent patch will add a new multipath hash policy where the packet fields used for multipath hash calculation are determined by user space. This patch adds a sysctl that allows user space to set these fields. The packet fields are represented using a bitmask and are common between IPv4 and IPv6 to allow user space to use the same numbering across both protocols. For example, to hash based on standard 5-tuple: # sysctl -w net.ipv6.fib_multipath_hash_fields=0x0037 net.ipv6.fib_multipath_hash_fields = 0x0037 To avoid introducing holes in 'struct netns_sysctl_ipv6', move the 'bindv6only' field after the multipath hash fields. The kernel rejects unknown fields, for example: # sysctl -w net.ipv6.fib_multipath_hash_fields=0x1000 sysctl: setting key "net.ipv6.fib_multipath_hash_fields": Invalid argument Signed-off-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/networking/ip-sysctl.rst27
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index afdcdc0691d6..4246cc4ae35b 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1773,6 +1773,33 @@ fib_multipath_hash_policy - INTEGER
- 1 - Layer 4 (standard 5-tuple)
- 2 - Layer 3 or inner Layer 3 if present
+fib_multipath_hash_fields - UNSIGNED INTEGER
+ When fib_multipath_hash_policy is set to 3 (custom multipath hash), the
+ fields used for multipath hash calculation are determined by this
+ sysctl.
+
+ This value is a bitmask which enables various fields for multipath hash
+ calculation.
+
+ Possible fields are:
+
+ ====== ============================
+ 0x0001 Source IP address
+ 0x0002 Destination IP address
+ 0x0004 IP protocol
+ 0x0008 Flow Label
+ 0x0010 Source port
+ 0x0020 Destination port
+ 0x0040 Inner source IP address
+ 0x0080 Inner destination IP address
+ 0x0100 Inner IP protocol
+ 0x0200 Inner Flow Label
+ 0x0400 Inner source port
+ 0x0800 Inner destination port
+ ====== ============================
+
+ Default: 0x0007 (source IP, destination IP and IP protocol)
+
anycast_src_echo_reply - BOOLEAN
Controls the use of anycast addresses as source addresses for ICMPv6
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