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Yan Zhai 98e8a5a370 ipv6: avoid atomic fragment on GSO packets 
[ Upstream commit 03d6c848bfb406e9ef6d9846d759e97beaeea113 ]

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: b210de4f8c97 ("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 11:06:46 +01:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-09-15 09:50:34 +02:00
9p 9p: virtio: make sure 'offs' is initialized in zc_request 2023-09-19 12:20:04 +02:00
802 mrp: introduce active flags to prevent UAF when applicant uninit 2023-01-14 10:16:18 +01:00
8021q vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit() 2023-05-30 12:57:53 +01:00
appletalk appletalk: Fix skb allocation size in loopback case 2021-04-07 15:00:08 +02:00
atm atm: hide unused procfs functions 2023-06-09 10:30:12 +02:00
ax25 net: ax25: Fix deadlock caused by skb_recv_datagram in ax25_recvmsg 2022-06-22 14:13:17 +02:00
batman-adv batman-adv: Hold rtnl lock during MTU update via netlink 2023-08-30 16:23:16 +02:00
bluetooth Bluetooth: hci_sock: Correctly bounds check and pad HCI_MON_NEW_INDEX name 2023-10-25 11:54:26 +02:00
bpf bpf: Move skb->len == 0 checks into __bpf_redirect 2023-01-14 10:15:31 +01:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-07-14 16:56:29 +02:00
bridge net: bridge: use DEV_STATS_INC() 2023-10-10 21:53:28 +02:00
caif net: caif: Fix use-after-free in cfusbl_device_notify() 2023-03-17 08:45:11 +01:00
can can: isotp: isotp_sendmsg(): fix TX state detection and wait behavior 2023-11-08 17:30:51 +01:00
ceph libceph: use kernel_connect() 2023-10-25 11:54:15 +02:00
core neighbour: fix various data-races 2023-11-08 17:30:41 +01:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 11:57:50 +02:00
dccp dccp: fix dccp_v4_err()/dccp_v6_err() again 2023-10-10 21:53:27 +02:00
decnet Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
dns_resolver docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
dsa net: dsa: tag_sja1105: fix MAC DA patching from meta frames 2023-07-27 08:44:10 +02:00
ethernet net: move devres helpers into a separate source file 2020-05-23 16:56:17 -07:00
ethtool net/ethtool/ioctl: return -EOPNOTSUPP if we have no phy stats 2023-01-24 07:19:55 +01:00
hsr hsr: Fix uninit-value access in fill_frame_info() 2023-09-19 12:20:29 +02:00
ieee802154 net: ieee802154: fix error return code in dgram_bind() 2022-11-03 23:57:51 +09:00
ife net: Fix Kconfig indentation 2019-09-26 08:56:17 +02:00
ipv4 tcp: fix cookie_init_timestamp() overflows 2023-11-20 11:06:46 +01:00
ipv6 ipv6: avoid atomic fragment on GSO packets 2023-11-20 11:06:46 +01:00
iucv net/iucv: Fix size of interrupt data 2023-03-22 13:30:00 +01:00
kcm kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg(). 2023-09-19 12:20:30 +02:00
key net: af_key: fix sadb_x_filter validation 2023-08-26 15:26:51 +02:00
l2tp ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() 2023-10-10 21:53:38 +02:00
l3mdev l3mdev: l3mdev_master_upper_ifindex_by_index_rcu should be using netdev_master_upper_dev_get_rcu 2022-04-27 13:53:50 +02:00
lapb net: lapb: Copy the skb before sending a packet 2021-02-10 09:29:14 +01:00
llc llc: Don't drop packet from non-root netns. 2023-07-27 08:44:40 +02:00
mac80211 wifi: mac80211: allow transmitting EAPOL frames with tainted key 2023-10-25 11:54:23 +02:00
mac802154 mac802154: fix missing INIT_LIST_HEAD in ieee802154_if_add() 2022-12-14 11:32:01 +01:00
mpls net: mpls: fix stale pointer if allocation fails during device rename 2023-02-22 12:55:58 +01:00
mptcp inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy(). 2023-04-26 11:27:41 +02:00
ncsi ncsi: Propagate carrier gain/loss events to the NCSI controller 2023-10-10 21:53:33 +02:00
netfilter netfilter: nfnetlink_log: silence bogus compiler warning 2023-11-08 17:30:49 +01:00
netlabel netlabel: fix shift wrapping bug in netlbl_catmap_setlong() 2023-09-19 12:20:05 +02:00
netlink netlink: Add __sock_i_ino() for __netlink_diag_dump(). 2023-07-27 08:43:43 +02:00
netrom netrom: Deny concurrent connect(). 2023-09-19 12:20:10 +02:00
nfc nfc: nci: fix possible NULL pointer dereference in send_acknowledge() 2023-10-25 11:54:19 +02:00
nsh net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment() 2023-05-30 12:57:52 +01:00
openvswitch net: openvswitch: fix possible memory leak in ovs_meter_cmd_set() 2023-02-22 12:55:57 +01:00
packet net/packet: annotate data-races around tp->status 2023-08-16 18:21:01 +02:00
phonet phonet: refcount leak in pep_sock_accep 2022-01-11 15:25:01 +01:00
psample net: psample: Fix netlink skb length with tunnel info 2021-03-07 12:34:07 +01:00
qrtr net: qrtr: Fix an uninit variable access bug in qrtr_tx_resume() 2023-04-20 12:10:26 +02:00
rds net: prevent address rewrite in kernel_bind() 2023-10-25 11:54:13 +02:00
rfkill net: rfkill: gpio: prevent value glitch during probe 2023-10-25 11:54:20 +02:00
rose net/rose: Fix to not accept on connected socket 2023-02-22 12:55:53 +01:00
rxrpc rxrpc: Fix hard call timeout units 2023-05-17 11:48:11 +02:00
sched net: sched: cls_u32: Fix allocation size in u32_init() 2023-11-08 17:30:48 +01:00
sctp sctp: update hb timer immediately after users change hb_interval 2023-10-10 21:53:39 +02:00
smc net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add 2023-09-19 12:20:29 +02:00
strparser bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding 2021-11-18 14:04:27 +01:00
sunrpc Revert "SUNRPC dont update timeout value on connection reset" 2023-10-10 21:53:35 +02:00
switchdev net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP 2021-02-07 15:37:12 +01:00
tipc tipc: Use size_add() in calls to struct_size() 2023-11-20 11:06:44 +01:00
tls net/tls: do not free tls_rec on async operation in bpf_exec_tx_verdict() 2023-09-19 12:20:30 +02:00
unix af_unix: Fix data-race around unix_tot_inflight. 2023-09-19 12:20:26 +02:00
vmw_vsock vsock: avoid to close connected socket after the timeout 2023-05-30 12:57:52 +01:00
wimax genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
wireless wifi: cfg80211: avoid leaking stack data into trace 2023-10-25 11:54:23 +02:00
x25 net/x25: Fix to not accept on connected socket 2023-02-15 17:22:15 +01:00
xdp xsk: Honor SO_BINDTODEVICE on bind 2023-07-27 08:44:09 +02:00
xfrm xfrm: interface: use DEV_STATS_INC() 2023-10-25 11:54:19 +02:00
compat.c net: Return the correct errno code 2021-06-18 10:00:06 +02:00
devres.c net: devres: rename the release callback of devm_register_netdev() 2020-06-30 15:57:34 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
socket.c net: prevent address rewrite in kernel_bind() 2023-10-25 11:54:13 +02:00
sysctl_net.c