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Top Forums UNIX for Advanced & Expert Users Negative values for peer inodes in ss -x output Post 303046271 by Skrynesaver on Wednesday 29th of April 2020 07:45:11 AM
Old 04-29-2020
Negative values for peer inodes in ss -x output

Hi all,

Long time no see, love what you've done with the place, been a while and asked this in the wrong forum initially...

I'm wondering how to interpret negative values for local and peer inode values for Unix sockets?

Code:
Netid  State      Recv-Q Send-Q Local Address:Port                 Peer Address:Port
...
u_str  ESTAB      0      0      /var/run/docker.sock -1847002447           * -1846996756

I can trace the local/peer relationship in the ss -xpan output for example...
grepping out known a negative inode id I get
Code:
# ss -xp | grep --  -1841560902
u_str  ESTAB      0      0      /var/run/docker.sock -1841556763           * -1841560902           users:(("dockerd",pid=29490,fd=276))
u_str  ESTAB      0      0      *                    -1841560902           * -1841556763           users:(("metricbeat",pid=5712,fd=94)

Then looking at the proc entry for the metricbeat process I get a non-negative inode for fd 94.
Code:
# ls -l /proc/5712/fd/
...
lrwx------ 1 root root 64 Apr 28 12:00 94 -> socket:[2453406394]

I'm curious as to the relationship (if any) between the "real" inode value and the negative value used for the inode in the ss output , what circumstances this value is used in (despite there being an inode for the symlink in /proc ) and general wisdom on the subject.

Thanks, Skrynesaver
 

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veth(4) 						     Linux Programmer's Manual							   veth(4)

NAME
veth - Virtual Ethernet Device DESCRIPTION
The veth devices are virtual Ethernet devices. They can act as tunnels between network namespaces to create a bridge to a physical network device in another namespace, but can also be used as standalone network devices. veth devices are always created in interconnected pairs. A pair can be created using the command: # ip link add <p1-name> type veth peer name <p2-name> In the above, p1-name and p2-name are the names assigned to the two connected end points. Packets transmitted on one device in the pair are immediately received on the other device. When either devices is down the link state of the pair is down. veth device pairs are useful for combining the network facilities of the kernel together in interesting ways. A particularly interesting use case is to place one end of a veth pair in one network namespace and the other end in another network namespace, thus allowing communi- cation between network namespaces. To do this, one first creates the veth device as above and then moves one side of the pair to the other namespace: # ip link set <p2-name> netns <p2-namespace> ethtool(8) can be used to find the peer of a veth network interface, using commands something like: # ip link add ve_A type veth peer name ve_B # Create veth pair # ethtool -S ve_A # Discover interface index of peer NIC statistics: peer_ifindex: 16 # ip link | grep '^16:' # Look up interface 16: ve_B@ve_A: <BROADCAST,MULTICAST,M-DOWN> mtu 1500 qdisc ... SEE ALSO
clone(2), network_namespaces(7), ip(8), ip-link(8), ip-netns(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2018-02-02 veth(4)
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