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Description of problem:
mptcpize apparently not mptcpizing iperf3
Version-Release number of selected component (if applicable):
mptcpd-0.8-1-el9
How reproducible:
always
Steps to Reproduce:
1. setup 2 KVM guests with rhel9, I used a build from 20211123. 3 NICs in both, terminated in 3 bridges (virbd0-2) on the hypervisor.
2. setup systemtap, run "stap -vg mptcp-app.stp iperf3" on both systems, run "iperf -s" on one box, "iperf -c <ip>" on the other box
3. setup basic mptcp on both systems, to verify operation:
Server # ip mptcp limits set subflow 1
Client # ip mptcp limits set subflow 1 add_addr_accepted 1
Server # ip mptcp endpoint add 198.51.100.1 dev enp2s0 signal
4. "dnf -y install pcp-zeroconf"
5. run "pmrep network.interface.in.bytes", observe that 2 NICs are used, so systemtap works for mptcpizing
6. on one of both systems, stop the systemtap script, and run "mptcpize run -c iperf -s" or "mptcpize run -d iperf3 -c"
Actual results:
- mptcpize is not outputting a message that the tcp socket got mptcpized
- connection can not be established
Additional info:
Running netcat, mptcpize is reporting that mptcpization is happening.
Is this a limitation, mptcpize just working for certain socket operations? The man page does not hint on it.
maybe it's because iperf3 does socket(<family>, SOCK_STREAM, 0) instead of socket(<family>, SOCK_STREAM, 6). If so, then we can fix this as a dup of https://bugzilla.redhat.com/show_bug.cgi?id=2015623: I'll check and let you know.
(In reply to Davide Caratti from comment #1)
> maybe it's because iperf3 does socket(<family>, SOCK_STREAM, 0) instead of
> socket(<family>, SOCK_STREAM, 6). If so, then we can fix this as a dup of
> https://bugzilla.redhat.com/show_bug.cgi?id=2015623: I'll check and let you
> know.
confirmed by the output of strace:
# strace -o strace.out -f iperf3 -s -p 1234
[...]
# cat strace.out
[...]
35221 socket(AF_INET6, SOCK_STREAM, IPPROTO_IP) = 3
35221 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
35221 setsockopt(3, SOL_IPV6, IPV6_V6ONLY, [0], 4) = 0
35221 bind(3, {sa_family=AF_INET6, sin6_port=htons(1234), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::", &sin6_addr), sin6_scope_id=0}, 28) = 0
35221 listen(3, 2147483647) = 0