kernel_samsung_a53x/net/core
Benoît Monin 4454492a69 net: skip offload for NETIF_F_IPV6_CSUM if ipv6 header contains extension
[ Upstream commit 04c20a9356f283da623903e81e7c6d5df7e4dc3c ]

As documented in skbuff.h, devices with NETIF_F_IPV6_CSUM capability
can only checksum TCP and UDP over IPv6 if the IP header does not
contains extension.

This is enforced for UDP packets emitted from user-space to an IPv6
address as they go through ip6_make_skb(), which calls
__ip6_append_data() where a check is done on the header size before
setting CHECKSUM_PARTIAL.

But the introduction of UDP encapsulation with fou6 added a code-path
where it is possible to get an skb with a partial UDP checksum and an
IPv6 header with extension:
* fou6 adds a UDP header with a partial checksum if the inner packet
does not contains a valid checksum.
* ip6_tunnel adds an IPv6 header with a destination option extension
header if encap_limit is non-zero (the default value is 4).

The thread linked below describes in more details how to reproduce the
problem with GRE-in-UDP tunnel.

Add a check on the network header size in skb_csum_hwoffload_help() to
make sure no IPv6 packet with extension header is handed to a network
device with NETIF_F_IPV6_CSUM capability.

Link: https://lore.kernel.org/netdev/26548921.1r3eYUQgxm@benoit.monin/T/#u
Fixes: aa3463d65e7b ("fou: Add encap ops for IPv6 tunnels")
Signed-off-by: Benoît Monin <benoit.monin@gmx.fr>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/5fbeecfc311ea182aa1d1c771725ab8b4cac515e.1729778144.git.benoit.monin@gmx.fr
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-23 23:22:04 +01:00
..
bpf_sk_storage.c
datagram.c
datagram.h
dev.c net: skip offload for NETIF_F_IPV6_CSUM if ipv6 header contains extension 2024-11-23 23:22:04 +01:00
dev_addr_lists.c
dev_ioctl.c
devlink.c
drop_monitor.c
dst.c
dst_cache.c
failover.c
fib_notifier.c
fib_rules.c
filter.c
flow_dissector.c
flow_offload.c
gen_estimator.c
gen_stats.c
gro_cells.c
hwbm.c
link_watch.c net: linkwatch: use system_unbound_wq 2024-11-23 23:20:22 +01:00
lwt_bpf.c
lwtunnel.c
Makefile
neighbour.c
net-procfs.c
net-sysfs.c ethtool: check device is present when getting link settings 2024-11-23 23:20:55 +01:00
net-sysfs.h
net-traces.c
net_namespace.c
netclassid_cgroup.c bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode 2024-11-23 23:20:59 +01:00
netevent.c
netpoll.c
netprio_cgroup.c bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode 2024-11-23 23:20:59 +01:00
page_pool.c
pktgen.c
ptp_classifier.c
request_sock.c
rtnetlink.c
scm.c
secure_seq.c
skbuff.c
skmsg.c
sock.c
sock_destructor.h inet: inet_defrag: prevent sk release while still in use 2024-11-23 23:21:16 +01:00
sock_diag.c
sock_map.c sock_map: Add a cond_resched() in sock_hash_free() 2024-11-23 23:21:18 +01:00
sock_reuseport.c
stream.c
sysctl_net_core.c
timestamping.c
tso.c
utils.c
xdp.c