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Separately locate external interfaces for IPv4 and IPv6

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Now that the back end allows passt/pasta to use different external
interfaces for IPv4 and IPv6, use that to do the right thing in the case
that the host has IPv4 and IPv6 connectivity via different interfaces.
If the user hasn't explicitly chosen an interface, separately search for
a suitable external interface for each protocol.

As a bonus, this substantially simplifies the external interface probe.  It
also eliminates a subtle confusing case where in some circumstances we
would pick the first interface in interface index order, and sometimes in
order of routes returned from netlink.  On some network configurations that
could cause tests to fail, because the logic in the tests was subtly
different (it always used route order).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson
2022-07-22 15:31:13 +10:00
committed by Stefano Brivio
parent 3eaf9f5320
commit 06abfcf6d9
7 changed files with 33 additions and 80 deletions
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3
test/two_guests/basic
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@@ -19,6 +19,7 @@ test Interface names
g1out IFNAME1 ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
g2out IFNAME2 ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
hout HOST_IFNAME ip -j -4 route show|jq -rM '[.[] | select(.dst == "default").dev] | .[0]'
hout HOST_IFNAME6 ip -j -6 route show|jq -rM '[.[] | select(.dst == "default").dev] | .[0]'
check [ -n "__IFNAME1__" ]
check [ -n "__IFNAME2__" ]
@@ -40,7 +41,7 @@ guest1 /sbin/dhclient -6 __IFNAME1__
guest2 /sbin/dhclient -6 __IFNAME2__
g1out ADDR1_6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME1__").addr_info[] | select(.prefixlen == 128).local'
g2out ADDR2_6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__IFNAME2__").addr_info[] | select(.prefixlen == 128).local'
hout HOST_ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__HOST_IFNAME__").addr_info[] | select(.scope == "global").local'
hout HOST_ADDR6 ip -j -6 addr show|jq -rM '.[] | select(.ifname == "__HOST_IFNAME6__").addr_info[] | select(.scope == "global").local'
check [ "__ADDR1_6__" = "__HOST_ADDR6__" ]
check [ "__ADDR2_6__" = "__HOST_ADDR6__" ]