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'ip vrf' follows the user semnatics established by 'ip netns'.
The 'ip vrf' subcommand supports 3 usages:
1. Run a command against a given vrf:
ip vrf exec NAME CMD
Uses the recently committed cgroup/sock BPF option. vrf directory
is added to cgroup2 mount. Individual vrfs are created under it. BPF
filter attached to vrf/NAME cgroup2 to set sk_bound_dev_if to the VRF
device index. From there the current process (ip's pid) is addded to
the cgroups.proc file and the given command is exected. In doing so
all AF_INET/AF_INET6 (ipv4/ipv6) sockets are automatically bound to
the VRF domain.
The association is inherited parent to child allowing the command to
be a shell from which other commands are run relative to the VRF.
2. Show the VRF a process is bound to:
ip vrf id
This command essentially looks at /proc/pid/cgroup for a "::/vrf/"
entry with the VRF name following.
3. Show process ids bound to a VRF
ip vrf pids NAME
This command dumps the file MNT/vrf/NAME/cgroup.procs since that file
shows the process ids in the particular vrf cgroup.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
89 lines
2.5 KiB
Groff
89 lines
2.5 KiB
Groff
.TH IP\-VRF 8 "7 Dec 2016" "iproute2" "Linux"
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.SH NAME
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ip-vrf \- run a command against a vrf
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.SH SYNOPSIS
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.sp
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.ad l
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.in +8
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.ti -8
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.B ip
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.B vrf
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.RI " { " COMMAND " | "
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.BR help " }"
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.sp
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.ti -8
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.BR "ip vrf identify"
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.RI "[ " PID " ]"
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.ti -8
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.BR "ip vrf pids"
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.I NAME
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.ti -8
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.BR "ip vrf exec "
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.RI "[ " NAME " ] " command ...
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.SH DESCRIPTION
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A VRF provides traffic isolation at layer 3 for routing, similar to how a
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VLAN is used to isolate traffic at layer 2. Fundamentally, a VRF is a separate
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routing table. Network devices are associated with a VRF by enslaving the
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device to the VRF. At that point network addresses assigned to the device are
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local to the VRF with host and connected routes moved to the table associated
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with the VRF.
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A process can specify a VRF using several APIs -- binding the socket to the
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VRF device using SO_BINDTODEVICE, setting the VRF association using
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IP_UNICAST_IF or IPV6_UNICAST_IF, or specifying the VRF for a specific message
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using IP_PKTINFO or IPV6_PKTINFO.
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By default a process is not bound to any VRF. An association can be set
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explicitly by making the program use one of the APIs mentioned above or
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implicitly using a helper to set SO_BINDTODEVICE for all IPv4 and IPv6
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sockets (AF_INET and AF_INET6) when the socket is created. This ip-vrf command
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is a helper to run a command against a specific VRF with the VRF association
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inherited parent to child.
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.TP
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.B ip vrf exec [ NAME ] cmd ... - Run cmd against the named VRF
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.sp
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This command allows applications that are VRF unaware to be run against
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a VRF other than the default VRF (main table). A command can be run against
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the default VRF by passing the "default" as the VRF name. This is useful if
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the current shell is associated with another VRF (e.g, Management VRF).
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.TP
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.B ip vrf identify [PID] - Report VRF association for process
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.sp
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This command shows the VRF association of the specified process. If PID is
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not specified then the id of the current process is used.
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.TP
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.B ip vrf pids NAME - Report processes associated with the named VRF
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.sp
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This command shows all process ids that are associated with the given
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VRF.
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.SH CAVEATS
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This command requires a kernel compiled with CGROUPS and CGROUP_BPF enabled.
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The VRF helper *only* affects network layer sockets.
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.SH EXAMPLES
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.PP
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ip vrf exec red ssh 10.100.1.254
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.RS
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Executes ssh to 10.100.1.254 against the VRF red table.
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.RE
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.SH SEE ALSO
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.br
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.BR ip (8),
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.BR ip-link (8),
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.BR ip-address (8),
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.BR ip-route (8),
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.BR ip-neighbor (8)
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.SH AUTHOR
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Original Manpage by David Ahern
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