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| author | Eric Dumazet <edumazet@google.com> | 2019-06-05 07:55:09 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-05 19:05:01 -0700 |
| commit | 323a53c41292a0d7efc8748856c623324c8d7c21 (patch) | |
| tree | 9c00710cc2f3b2d2df62d62633a1de21f5fa3e68 /Documentation/networking | |
| parent | e736bf72af568d0a04f186e1c5dde6789b19c35e (diff) | |
| download | linux-0-day-323a53c41292a0d7efc8748856c623324c8d7c21.tar.gz linux-0-day-323a53c41292a0d7efc8748856c623324c8d7c21.tar.xz | |
ipv6: tcp: enable flowlabel reflection in some RST packets
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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index a73b3a02e49aa..f4b1043e92edc 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. |