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-rw-r--r--Documentation/networking/ip-sysctl.txt20
1 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index a73b3a02e49a..f4b1043e92ed 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1429,14 +1429,24 @@ flowlabel_state_ranges - BOOLEAN
FALSE: disabled
Default: true
-flowlabel_reflect - BOOLEAN
- Automatically reflect the flow label. Needed for Path MTU
+flowlabel_reflect - INTEGER
+ Control flow label reflection. Needed for Path MTU
Discovery to work with Equal Cost Multipath Routing in anycast
environments. See RFC 7690 and:
https://tools.ietf.org/html/draft-wang-6man-flow-label-reflection-01
- TRUE: enabled
- FALSE: disabled
- Default: FALSE
+
+ This is a mask of two bits.
+ 1: enabled for established flows
+
+ Note that this prevents automatic flowlabel changes, as done
+ in "tcp: change IPv6 flow-label upon receiving spurious retransmission"
+ and "tcp: Change txhash on every SYN and RTO retransmit"
+
+ 2: enabled for TCP RESET packets (no active listener)
+ If set, a RST packet sent in response to a SYN packet on a closed
+ port will reflect the incoming flow label.
+
+ Default: 0
fib_multipath_hash_policy - INTEGER
Controls which hash policy to use for multipath routes.