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net: L2TPv3 transport

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This transport allows to connect a QEMU nic to a static Ethernet
over L2TPv3 tunnel. The transport supports all options present
in the Linux kernel implementation. It allows QEMU to connect
to any Linux host running kernel 3.3+, most routers and network
devices as well as other QEMU instances.

[Fixed up net_client_init1() switch statement to support -netdev
--Stefan]

Signed-off-by: Anton Ivanov <antivano@cisco.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Anton Ivanov 2014-06-20 10:34:41 +01:00 • committed by Stefan Hajnoczi
parent eb3f45c5af
commit 3fb69aa1d1
6 changed files with 908 additions and 0 deletions
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82
qemu-options.hx
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@ -1432,6 +1432,29 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
" connects a host TAP network interface to a host bridge device 'br'\n"
" (default=" DEFAULT_BRIDGE_INTERFACE ") using the program 'helper'\n"
" (default=" DEFAULT_BRIDGE_HELPER ")\n"
#endif
#ifdef __linux__
"-net l2tpv3[,vlan=n][,name=str],src=srcaddr,dst=dstaddr[,srcport=srcport][,dstport=dstport],txsession=txsession[,rxsession=rxsession][,ipv6=on/off][,udp=on/off][,cookie64=on/off][,counter][,pincounter][,txcookie=txcookie][,rxcookie=rxcookie][,offset=offset]\n"
" connect the VLAN to an Ethernet over L2TPv3 pseudowire\n"
" Linux kernel 3.3+ as well as most routers can talk\n"
" L2TPv3. This transport allows to connect a VM to a VM,\n"
" VM to a router and even VM to Host. It is a nearly-universal\n"
" standard (RFC3391). Note - this implementation uses static\n"
" pre-configured tunnels (same as the Linux kernel).\n"
" use 'src=' to specify source address\n"
" use 'dst=' to specify destination address\n"
" use 'udp=on' to specify udp encapsulation\n"
" use 'dstport=' to specify destination udp port\n"
" use 'dstport=' to specify destination udp port\n"
" use 'ipv6=on' to force v6\n"
" L2TPv3 uses cookies to prevent misconfiguration as\n"
" well as a weak security measure\n"
" use 'rxcookie=0x012345678' to specify a rxcookie\n"
" use 'txcookie=0x012345678' to specify a txcookie\n"
" use 'cookie64=on' to set cookie size to 64 bit, otherwise 32\n"
" use 'counter=off' to force a 'cut-down' L2TPv3 with no counter\n"
" use 'pincounter=on' to work around broken counter handling in peer\n"
" use 'offset=X' to add an extra offset between header and data\n"
#endif
"-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
" connect the vlan 'n' to another VLAN using a socket connection\n"
@ -1778,6 +1801,65 @@ qemu-system-i386 linux.img \
-net socket,mcast=239.192.168.1:1102,localaddr=1.2.3.4
@end example
@item -netdev l2tpv3,id=@var{id},src=@var{srcaddr},dst=@var{dstaddr}[,srcport=@var{srcport}][,dstport=@var{dstport}],txsession=@var{txsession}[,rxsession=@var{rxsession}][,ipv6][,udp][,cookie64][,counter][,pincounter][,txcookie=@var{txcookie}][,rxcookie=@var{rxcookie}][,offset=@var{offset}]
@item -net l2tpv3[,vlan=@var{n}][,name=@var{name}],src=@var{srcaddr},dst=@var{dstaddr}[,srcport=@var{srcport}][,dstport=@var{dstport}],txsession=@var{txsession}[,rxsession=@var{rxsession}][,ipv6][,udp][,cookie64][,counter][,pincounter][,txcookie=@var{txcookie}][,rxcookie=@var{rxcookie}][,offset=@var{offset}]
Connect VLAN @var{n} to L2TPv3 pseudowire. L2TPv3 (RFC3391) is a popular
protocol to transport Ethernet (and other Layer 2) data frames between
two systems. It is present in routers, firewalls and the Linux kernel
(from version 3.3 onwards).
This transport allows a VM to communicate to another VM, router or firewall directly.
@item src=@var{srcaddr}
source address (mandatory)
@item dst=@var{dstaddr}
destination address (mandatory)
@item udp
select udp encapsulation (default is ip).
@item srcport=@var{srcport}
source udp port.
@item dstport=@var{dstport}
destination udp port.
@item ipv6
force v6, otherwise defaults to v4.
@item rxcookie=@var{rxcookie}
@item txcookie=@var{txcookie}
Cookies are a weak form of security in the l2tpv3 specification.
Their function is mostly to prevent misconfiguration. By default they are 32
bit.
@item cookie64
Set cookie size to 64 bit instead of the default 32
@item counter=off
Force a 'cut-down' L2TPv3 with no counter as in
draft-mkonstan-l2tpext-keyed-ipv6-tunnel-00
@item pincounter=on
Work around broken counter handling in peer. This may also help on
networks which have packet reorder.
@item offset=@var{offset}
Add an extra offset between header and data
For example, to attach a VM running on host 4.3.2.1 via L2TPv3 to the bridge br-lan
on the remote Linux host 1.2.3.4:
@example
# Setup tunnel on linux host using raw ip as encapsulation
# on 1.2.3.4
ip l2tp add tunnel remote 4.3.2.1 local 1.2.3.4 tunnel_id 1 peer_tunnel_id 1 \
encap udp udp_sport 16384 udp_dport 16384
ip l2tp add session tunnel_id 1 name vmtunnel0 session_id \
0xFFFFFFFF peer_session_id 0xFFFFFFFF
ifconfig vmtunnel0 mtu 1500
ifconfig vmtunnel0 up
brctl addif br-lan vmtunnel0
# on 4.3.2.1
# launch QEMU instance - if your network has reorder or is very lossy add ,pincounter
qemu-system-i386 linux.img -net nic -net l2tpv3,src=4.2.3.1,dst=1.2.3.4,udp,srcport=16384,dstport=16384,rxsession=0xffffffff,txsession=0xffffffff,counter
@end example
@item -netdev vde,id=@var{id}[,sock=@var{socketpath}][,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}]
@item -net vde[,vlan=@var{n}][,name=@var{name}][,sock=@var{socketpath}] [,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}]
Connect VLAN @var{n} to PORT @var{n} of a vde switch running on host and