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Yan Zhai c9faed4c8c ipv6: avoid atomic fragment on GSO packets 
[ Upstream commit 03d6c848bf ]

When the ipv6 stack output a GSO packet, if its gso_size is larger than
dst MTU, then all segments would be fragmented. However, it is possible
for a GSO packet to have a trailing segment with smaller actual size
than both gso_size as well as the MTU, which leads to an "atomic
fragment". Atomic fragments are considered harmful in RFC-8021. An
Existing report from APNIC also shows that atomic fragments are more
likely to be dropped even it is equivalent to a no-op [1].

Add an extra check in the GSO slow output path. For each segment from
the original over-sized packet, if it fits with the path MTU, then avoid
generating an atomic fragment.

Link: https://www.potaroo.net/presentations/2022-03-01-ipv6-frag.pdf [1]
Fixes: b210de4f8c ("net: ipv6: Validate GSO SKB before finish IPv6 processing")
Reported-by: David Wragg <dwragg@cloudflare.com>
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Link: https://lore.kernel.org/r/90912e3503a242dca0bc36958b11ed03a2696e5e.1698156966.git.yan@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-11-20 10:29:17 +01:00
..
6lowpan
9p 9p: virtio: make sure 'offs' is initialized in zc_request 2023-09-23 10:47:57 +02:00
802 mrp: introduce active flags to prevent UAF when applicant uninit 2023-01-18 11:30:36 +01:00
8021q vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit() 2023-05-30 12:42:11 +01:00
appletalk
atm atm: hide unused procfs functions 2023-06-09 10:24:01 +02:00
ax25
batman-adv batman-adv: Fix batadv_v_ogm_aggr_send memory leak 2023-08-30 16:31:55 +02:00
bluetooth Bluetooth: hci_sock: Correctly bounds check and pad HCI_MON_NEW_INDEX name 2023-10-25 11:17:03 +02:00
bpf bpf, test_run: Fix alignment problem in bpf_prog_test_run_skb() 2022-11-25 17:40:29 +01:00
bpfilter
bridge net: bridge: use DEV_STATS_INC() 2023-10-10 21:44:57 +02:00
caif net: caif: Fix use-after-free in cfusbl_device_notify() 2023-03-17 08:31:44 +01:00
can can: bcm: Fix UAF in bcm_proc_show() 2023-08-11 11:45:24 +02:00
ceph libceph: use kernel_connect() 2023-10-25 11:16:51 +02:00
core net: pktgen: Fix interface flags printing 2023-10-25 11:16:49 +02:00
dcb
dccp dccp: fix dccp_v4_err()/dccp_v6_err() again 2023-10-10 21:45:02 +02:00
decnet Remove DECnet support from kernel 2023-06-21 15:39:57 +02:00
dns_resolver
dsa
ethernet
hsr net: hsr: Fix potential use-after-free 2022-12-08 11:18:33 +01:00
ieee802154 net: ieee802154: fix error return code in dgram_bind() 2022-11-03 23:52:30 +09:00
ife
ipv4 tcp_metrics: do not create an entry from tcp_init_metrics() 2023-11-20 10:29:16 +01:00
ipv6 ipv6: avoid atomic fragment on GSO packets 2023-11-20 10:29:17 +01:00
iucv net/iucv: Fix size of interrupt data 2023-03-22 13:27:10 +01:00
kcm kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-23 10:48:15 +02:00
key net: af_key: fix sadb_x_filter validation 2023-08-30 16:31:48 +02:00
l2tp ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() 2023-10-10 21:45:01 +02:00
l3mdev
lapb
llc llc: Don't drop packet from non-root netns. 2023-08-11 11:45:26 +02:00
mac80211 wifi: mac80211: allow transmitting EAPOL frames with tainted key 2023-10-25 11:16:57 +02:00
mac802154 mac802154: fix missing INIT_LIST_HEAD in ieee802154_if_add() 2022-12-14 11:28:28 +01:00
mpls net: mpls: fix stale pointer if allocation fails during device rename 2023-02-22 12:47:21 +01:00
ncsi
netfilter netfilter: nfnetlink_log: silence bogus compiler warning 2023-11-08 11:22:20 +01:00
netlabel netlabel: fix shift wrapping bug in netlbl_catmap_setlong() 2023-09-23 10:47:58 +02:00
netlink netlink: Add __sock_i_ino() for __netlink_diag_dump(). 2023-08-11 11:45:07 +02:00
netrom netrom: Deny concurrent connect(). 2023-09-23 10:48:01 +02:00
nfc nfc: nci: fix possible NULL pointer dereference in send_acknowledge() 2023-10-25 11:16:42 +02:00
nsh net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment() 2023-05-30 12:42:11 +01:00
openvswitch net: openvswitch: fix flow memory leak in ovs_flow_cmd_new 2023-02-22 12:47:12 +01:00
packet net/packet: annotate data-races around tp->status 2023-08-16 18:13:00 +02:00
phonet
psample
qrtr
rds net: prevent address rewrite in kernel_bind() 2023-10-25 11:16:21 +02:00
rfkill net: rfkill: gpio: prevent value glitch during probe 2023-10-25 11:16:45 +02:00
rose net/rose: Fix to not accept on connected socket 2023-02-22 12:47:19 +01:00
rxrpc rxrpc: Fix hard call timeout units 2023-05-17 11:13:24 +02:00
sched net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve 2023-10-25 11:16:48 +02:00
sctp sctp: update hb timer immediately after users change hb_interval 2023-10-10 21:45:01 +02:00
smc net/smc: Remove redundant refcount increase 2022-09-15 12:17:03 +02:00
strparser
sunrpc SUNRPC: Fix UAF in svc_tcp_listen_data_ready() 2023-08-11 11:45:20 +02:00
switchdev
tipc net: tipc: resize nlattr array to correct size 2023-06-21 15:39:59 +02:00
tls net/tls: Fix race in TLS device down flow 2022-07-29 17:10:32 +02:00
unix af_unix: Fix data-race around unix_tot_inflight. 2023-09-23 10:48:13 +02:00
vmw_vsock vsock: avoid to close connected socket after the timeout 2023-05-30 12:42:10 +01:00
wimax
wireless wifi: cfg80211: avoid leaking stack data into trace 2023-10-25 11:16:57 +02:00
x25 net/x25: Fix to not accept on connected socket 2023-02-22 12:47:12 +01:00
xdp
xfrm xfrm: interface: use DEV_STATS_INC() 2023-10-25 11:16:44 +02:00
compat.c
Kconfig Remove DECnet support from kernel 2023-06-21 15:39:57 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:39:57 +02:00
socket.c net: prevent address rewrite in kernel_bind() 2023-10-25 11:16:21 +02:00
sysctl_net.c