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628bc3e5a1
linux/net
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Samuel Thibault 628bc3e5a1 l2tp: Support several sockets with same IP/port quadruple 
Some l2tp providers will use 1701 as origin port and open several
tunnels for the same origin and target. On the Linux side, this
may mean opening several sockets, but then trafic will go to only
one of them, losing the trafic for the tunnel of the other socket
(or leaving it up to userland, consuming a lot of cpu%).

This can also happen when the l2tp provider uses a cluster, and
load-balancing happens to migrate from one origin IP to another one,
for which a socket was already established. Managing reassigning
tunnels from one socket to another would be very hairy for userland.

Lastly, as documented in l2tpconfig(1), as client it may be necessary
to use 1701 as origin port for odd firewalls reasons, which could
prevent from establishing several tunnels to a l2tp server, for the
same reason: trafic would get only on one of the two sockets.

With the V2 protocol it is however easy to route trafic to the proper
tunnel, by looking up the tunnel number in the network namespace. This
fixes the three cases altogether.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Link: https://lore.kernel.org/r/20240506215336.1470009-1-samuel.thibault@ens-lyon.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-05-09 15:50:36 +02:00
..
6lowpan net: fill in MODULE_DESCRIPTION()s for 6LoWPAN 2024-02-09 14:12:01 -08:00
9p 9p: Fix read/write debug statements to report server reply 2024-02-12 21:18:54 +09:00
802
8021q net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
appletalk appletalk: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:42 +01:00
atm inet: introduce dst_rtable() helper 2024-04-30 18:32:38 -07:00
ax25 ax25: Remove superfuous "return" from ax25_ds_set_timer 2024-05-08 12:23:10 +01:00
batman-adv net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
bluetooth ipv6: introduce dst_rt6_info() helper 2024-04-29 13:32:01 +01:00
bpf bpf: check bpf_dummy_struct_ops program params for test runs 2024-04-25 12:42:43 -07:00
bridge net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
caif caif: Use UTILITY_NAME_LENGTH instead of hard-coding 16 2024-04-02 18:20:00 -07:00
can linux-can-next-for-6.9-20240220 2024-02-20 15:32:45 +01:00
ceph libceph: init the cursor when preparing sparse read in msgr2 2024-03-06 12:43:01 +01:00
core net: dst_cache: minor optimization in dst_cache_set_ip6() 2024-05-08 18:50:11 -07:00
dcb
dccp net: dccp: Fix ccid2_rtt_estimator() kernel-doc 2024-05-07 16:15:08 -07:00
devlink devlink: extend devlink_param *set pointer 2024-04-22 13:05:19 -07:00
dns_resolver Networking changes for 6.8. 2024-01-11 10:07:29 -08:00
dsa net: dsa: add support switches global DSCP priority mapping 2024-05-08 10:35:10 +01:00
ethernet ethernet: Add helper for assigning packet type when dest address does not match device address 2024-04-25 08:20:54 -07:00
ethtool net: ethtool: pse-pd: Expand pse commands with the PSE PoE interface 2024-04-18 18:27:02 -07:00
handshake net/handshake: remove redundant assignment to variable ret 2024-04-16 17:14:55 -07:00
hsr net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
ieee802154 net: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:41 +01:00
ife net: sched: ife: fix potential use-after-free 2023-12-15 10:50:18 +00:00
ipv4 net/ipv4: add tracepoint for icmp_send 2024-05-08 10:39:26 +01:00
ipv6 net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
iucv net/iucv: Avoid explicit cpumask var allocation on stack 2024-04-02 18:19:09 -07:00
kcm net: kcm: fix incorrect parameter validation in the kcm_getsockopt) function 2024-03-11 09:53:22 +00:00
key net: fill in MODULE_DESCRIPTION()s for af_key 2024-02-09 14:12:01 -08:00
l2tp l2tp: Support several sockets with same IP/port quadruple 2024-05-09 15:50:36 +02:00
l3mdev
lapb
llc net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
mac80211 wifi: mac80211: handle color change per link 2024-05-03 10:18:19 +02:00
mac802154 mac802154: fix llsec key resources release in mac802154_llsec_key_del 2024-03-06 21:01:26 +01:00
mctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-02-29 14:24:56 -08:00
mpls net: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:41 +01:00
mptcp mptcp: fix possible NULL dereferences 2024-05-07 16:36:26 -07:00
ncsi
netfilter ipvs: allow some sysctls in non-init user namespaces 2024-05-08 12:22:18 +01:00
netlabel netlabel: remove impossible return value in netlbl_bitmap_walk 2024-02-28 19:37:34 -08:00
netlink netlink: support all extack types in dumps 2024-04-23 10:09:49 -07:00
netrom net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
nfc net: nfc: remove inappropriate attrs check 2024-04-12 18:52:35 -07:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-04-26 12:20:01 +02:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-04-25 12:41:37 -07:00
packet af_packet: avoid a false positive warning in packet_setsockopt() 2024-04-08 13:19:01 +01:00
phonet phonet: no longer hold RTNL in route_dumpit() 2024-05-08 18:54:50 -07:00
psample ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
qrtr net: qrtr: support suspend/hibernation 2024-04-09 14:43:28 +03:00
rds net: rds: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:42 +01:00
rfkill net: rfkill: gpio: Convert to platform remove callback returning void 2024-03-25 15:40:22 +01:00
rose net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
rxrpc net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
sched net: annotate writes on dev->mtu from ndo_change_mtu() 2024-05-07 16:19:14 -07:00
sctp net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
smc net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
strparser
sunrpc net: sunrpc: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:42 +01:00
switchdev net: bridge: switchdev: Improve error message for port_obj_add/del functions 2024-05-08 12:19:12 +01:00
tipc net: Remove ctl_table sentinel elements from several networking subsystems 2024-05-03 13:29:42 +01:00
tls Revert "net: mirror skb frag ref/unref helpers" 2024-05-03 16:05:53 -07:00
unix net: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:41 +01:00
vmw_vsock vsock/virtio: fix packet delivery to tap device 2024-04-02 18:00:24 -07:00
wireless Merge wireless into wireless-next 2024-05-06 16:32:51 +02:00
x25 ax.25: x.25: Remove the now superfluous sentinel elements from ctl_table array 2024-05-03 13:29:43 +01:00
xdp xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING 2024-04-05 22:47:22 -07:00
xfrm rtnetlink: allow rtnl_fill_link_netnsid() to run under RCU protection 2024-05-07 11:14:50 +02:00
compat.c file: stop exposing receive_fd_user() 2023-12-12 14:24:14 +01:00
devres.c
Kconfig net: add IEEE 802.1q specific helpers 2024-05-08 10:35:09 +01:00
Kconfig.debug
Makefile af_unix: Remove CONFIG_UNIX_SCM. 2024-01-31 16:41:16 -08:00
socket.c net: remove {revc,send}msg_copy_msghdr() from exports 2024-03-14 16:48:53 -07:00
sysctl_net.c