Calculate the broadcast address #248
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Since the Travis CI build doesn't show the problem this might save someone else a bit of time.
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Sorry I missed this. The code looks correct. Would you mind squashing into a single commit? |
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ping @tcely :) |
This is like "ip addr add 127.0.0.1/8 broadcast +" and prevents interfaces without broadcast addresses. Configuring the IP and netmask, but not the broadcast address leaves many applications in a broken state on Linux interfaces.
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Squashed these commits as requested. |
brandt
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Oct 30, 2019
Since [vishvananda#248](vishvananda#248), adding an address automatically sets the broadcast if the broadcast address was not specified. This is undesirable when adding an IP with a prefixlen of /31 or /32. (Additional details in the issues linked below.) This changes the behavior so that the broadcast is only automatically set if the prefixlen is /30 or larger. Issue reported in: - vishvananda#329 - vishvananda#471 See also: - [RFC 3021](http://tools.ietf.org/html/rfc3021) Alternatives to this PR: A. vishvananda#472 - Adds `AddrAddWithoutCalculatedBroadcast`. B. jjastrze-ovh@9a85a61 - Breaking change to make auto-setting the broadcast address an opt-in feature. C. <no existing PR> - Suppress sending of the broadcast to netlink when `addr` has a broadcast set to `0.0.0.0`.
brandt
added a commit
to brandt/netlink
that referenced
this pull request
Oct 30, 2019
Since [vishvananda#248](vishvananda#248), adding an address automatically sets the broadcast if the broadcast address was not specified. This is undesirable when adding an IP with a prefixlen of /31 or /32. (Additional details in the issues linked below.) This changes the behavior so that the broadcast is only automatically set if the prefixlen is /30 or larger. Issue reported in: - vishvananda#329 - vishvananda#471 See also: - [RFC 3021](http://tools.ietf.org/html/rfc3021) Alternatives to this PR: A. vishvananda#472 - Adds `AddrAddWithoutCalculatedBroadcast`. B. jjastrze-ovh@9a85a61 - Breaking change to make auto-setting the broadcast address an opt-in feature. C. already works - Suppress setting the broadcast when addr's broadcast address is set to `0.0.0.0`. (This works today, but I'm not sure the behavior can be relied upon as a public API.)
vishvananda
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that referenced
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Nov 13, 2019
Since [#248](#248), adding an address automatically sets the broadcast if the broadcast address was not specified. This is undesirable when adding an IP with a prefixlen of /31 or /32. (Additional details in the issues linked below.) This changes the behavior so that the broadcast is only automatically set if the prefixlen is /30 or larger. Issue reported in: - #329 - #471 See also: - [RFC 3021](http://tools.ietf.org/html/rfc3021) Alternatives to this PR: A. #472 - Adds `AddrAddWithoutCalculatedBroadcast`. B. jjastrze-ovh@9a85a61 - Breaking change to make auto-setting the broadcast address an opt-in feature. C. already works - Suppress setting the broadcast when addr's broadcast address is set to `0.0.0.0`. (This works today, but I'm not sure the behavior can be relied upon as a public API.)
gkodali-zededa
pushed a commit
to gkodali-zededa/netlink
that referenced
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May 21, 2021
Since [vishvananda#248](vishvananda#248), adding an address automatically sets the broadcast if the broadcast address was not specified. This is undesirable when adding an IP with a prefixlen of /31 or /32. (Additional details in the issues linked below.) This changes the behavior so that the broadcast is only automatically set if the prefixlen is /30 or larger. Issue reported in: - vishvananda#329 - vishvananda#471 See also: - [RFC 3021](http://tools.ietf.org/html/rfc3021) Alternatives to this PR: A. vishvananda#472 - Adds `AddrAddWithoutCalculatedBroadcast`. B. jjastrze-ovh@9a85a61 - Breaking change to make auto-setting the broadcast address an opt-in feature. C. already works - Suppress setting the broadcast when addr's broadcast address is set to `0.0.0.0`. (This works today, but I'm not sure the behavior can be relied upon as a public API.)
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This is like "ip addr add 127.0.0.1/8 broadcast +" and prevents interfaces without broadcast addresses.
Configuring the IP and netmask, but not the broadcast address leaves many applications in a broken state on Linux interfaces.