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x/sys: Increase the number of linux routing tables #40542

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sniperking1234 opened this issue Aug 3, 2020 · 1 comment
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x/sys: Increase the number of linux routing tables #40542

sniperking1234 opened this issue Aug 3, 2020 · 1 comment
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@sniperking1234
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sniperking1234 commented Aug 3, 2020 •
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What version of Go are you using (go version)?

go version go1.14.4 linux/amd64

At present, the maximum number of routing tables is 32K.However, only 255 routing tables are supported in the code.

https://github.com/golang/sys/blob/4b90ce9b60b31bd0d0cbceb17532b5c810912f88/unix/ztypes_linux.go#L614

Should the code be modified to support a larger number of routing tables?
@gopherbot gopherbot added this to the Unreleased milestone Aug 3, 2020
@tklauser
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tklauser commented Aug 3, 2020

I don't think there's anything we need to change in x/sys. type RtMsg and all the other types in ztypes_*.go are auto-generated from kernel headers. These types need to correspond to the respective type expected by the kernel.

As a side-note (unrelated to x/sys): RTA_TABLE rtnetlink attributes are probably what you are looking for, see https://man7.org/linux/man-pages/man7/rtnetlink.7.html. If such an attribute is present its value is used as the table ID and the the table field in struct rt_msg is ignored.

@tklauser tklauser closed this as completed Aug 3, 2020
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