Yan Zhai 4482b250c8 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 10:30:10 +01:00
..
6lowpan	6lowpan: iphc: Fix an off-by-one check of array index	2021-09-15 09:47:31 +02:00
9p	9p: virtio: make sure 'offs' is initialized in zc_request	2023-09-23 10:59:37 +02:00
802	mrp: introduce active flags to prevent UAF when applicant uninit	2023-01-18 11:41:37 +01:00
8021q	vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit()	2023-05-30 12:44:06 +01:00
appletalk	appletalk: Fix skb allocation size in loopback case	2021-04-07 14:47:41 +02:00
atm	atm: hide unused procfs functions	2023-06-09 10:28:59 +02:00
ax25	ax25: Fix UAF bugs in ax25 timers	2022-04-20 09:19:40 +02:00
batman-adv	batman-adv: Hold rtnl lock during MTU update via netlink	2023-08-30 16:27:25 +02:00
bluetooth	Bluetooth: hci_sock: Correctly bounds check and pad HCI_MON_NEW_INDEX name	2023-10-25 11:53:25 +02:00
bpf	bpf: Move skb->len == 0 checks into __bpf_redirect	2023-01-18 11:41:04 +01:00
bpfilter	bpfilter: Specify the log level for the kmsg message	2021-07-14 16:53:33 +02:00
bridge	net: bridge: use DEV_STATS_INC()	2023-10-10 21:46:37 +02:00
caif	net: caif: Fix use-after-free in cfusbl_device_notify()	2023-03-17 08:32:51 +01:00
can	can: bcm: Fix UAF in bcm_proc_show()	2023-07-27 08:37:40 +02:00
ceph	libceph: use kernel_connect()	2023-10-25 11:53:19 +02:00
core	neighbour: fix various data-races	2023-11-08 11:23:35 +01:00
dcb	net: dcb: choose correct policy to parse DCB_ATTR_BCN	2023-08-11 11:53:57 +02:00
dccp	dccp: fix dccp_v4_err()/dccp_v6_err() again	2023-10-10 21:46:37 +02:00
decnet	Remove DECnet support from kernel	2023-06-21 15:44:10 +02:00
dns_resolver
dsa	net: dsa: tag_sja1105: fix MAC DA patching from meta frames	2023-07-27 08:37:24 +02:00
ethernet
hsr	hsr: Avoid double remove of a node.	2023-01-18 11:41:09 +01:00
ieee802154	net: ieee802154: fix error return code in dgram_bind()	2022-11-03 23:56:54 +09:00
ife
ipv4	tcp: fix cookie_init_timestamp() overflows	2023-11-20 10:30:10 +01:00
ipv6	ipv6: avoid atomic fragment on GSO packets	2023-11-20 10:30:10 +01:00
iucv	treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()	2023-04-20 12:07:32 +02:00
kcm	kcm: Fix error handling for SOCK_DGRAM in kcm_sendmsg().	2023-09-23 11:00:02 +02:00
key	net: af_key: fix sadb_x_filter validation	2023-08-30 16:27:16 +02:00
l2tp	ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()	2023-10-10 21:46:44 +02:00
l3mdev	l3mdev: l3mdev_master_upper_ifindex_by_index_rcu should be using netdev_master_upper_dev_get_rcu	2022-04-27 13:50:47 +02:00
lapb	net: lapb: Copy the skb before sending a packet	2021-02-10 09:25:28 +01:00
llc	llc: Don't drop packet from non-root netns.	2023-07-27 08:37:44 +02:00
mac80211	wifi: mac80211: allow transmitting EAPOL frames with tainted key	2023-10-25 11:53:23 +02:00
mac802154	mac802154: fix missing INIT_LIST_HEAD in ieee802154_if_add()	2022-12-14 11:30:45 +01:00
mpls	net: mpls: fix stale pointer if allocation fails during device rename	2023-02-22 12:50:41 +01:00
ncsi	ncsi: Propagate carrier gain/loss events to the NCSI controller	2023-10-10 21:46:40 +02:00
netfilter	netfilter: nfnetlink_log: silence bogus compiler warning	2023-11-08 11:23:41 +01:00
netlabel	netlabel: fix shift wrapping bug in netlbl_catmap_setlong()	2023-09-23 10:59:39 +02:00
netlink	netlink: Add __sock_i_ino() for __netlink_diag_dump().	2023-07-27 08:37:12 +02:00
netrom	netrom: Deny concurrent connect().	2023-09-23 10:59:43 +02:00
nfc	nfc: nci: fix possible NULL pointer dereference in send_acknowledge()	2023-10-25 11:53:20 +02:00
nsh	net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment()	2023-05-30 12:44:05 +01:00
openvswitch	net: openvswitch: fix flow memory leak in ovs_flow_cmd_new	2023-02-22 12:50:25 +01:00
packet	net/packet: annotate data-races around tp->status	2023-08-16 18:19:23 +02:00
phonet	phonet: refcount leak in pep_sock_accep	2022-01-11 15:23:33 +01:00
psample
qrtr	net: qrtr: fix another OOB Read in qrtr_endpoint_post	2021-09-03 10:08:12 +02:00
rds	net: prevent address rewrite in kernel_bind()	2023-10-25 11:53:18 +02:00
rfkill	net: rfkill: gpio: prevent value glitch during probe	2023-10-25 11:53:21 +02:00
rose	net/rose: Fix to not accept on connected socket	2023-02-22 12:50:34 +01:00
rxrpc	rxrpc: Fix hard call timeout units	2023-05-17 11:35:59 +02:00
sched	net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve	2023-10-25 11:53:21 +02:00
sctp	sctp: update hb timer immediately after users change hb_interval	2023-10-10 21:46:45 +02:00
smc	net/smc: fix fallback failed while sendmsg with fastopen	2023-03-17 08:32:51 +01:00
strparser	bpf: sockmap, strparser, and tls are reusing qdisc_skb_cb and colliding	2021-11-17 09:48:48 +01:00
sunrpc	SUNRPC: Mark the cred for revalidation if the server rejects it	2023-10-10 21:46:35 +02:00
switchdev	net: switchdev: do not propagate bridge updates across bridges	2021-10-27 09:54:24 +02:00
tipc	net: tipc: resize nlattr array to correct size	2023-06-21 15:44:12 +02:00
tls	net/tls: do not free tls_rec on async operation in bpf_exec_tx_verdict()	2023-09-23 11:00:02 +02:00
unix	af_unix: Fix data-race around unix_tot_inflight.	2023-09-23 10:59:58 +02:00
vmw_vsock	vsock: avoid to close connected socket after the timeout	2023-05-30 12:44:05 +01:00
wimax
wireless	wifi: cfg80211: avoid leaking stack data into trace	2023-10-25 11:53:23 +02:00
x25	net/x25: Fix to not accept on connected socket	2023-02-22 12:50:26 +01:00
xdp	xsk: Honor SO_BINDTODEVICE on bind	2023-07-27 08:37:23 +02:00
xfrm	xfrm: interface: use DEV_STATS_INC()	2023-10-25 11:53:21 +02:00
compat.c	net: Return the correct errno code	2021-06-18 09:59:00 +02:00
Kconfig	Remove DECnet support from kernel	2023-06-21 15:44:10 +02:00
Makefile	Remove DECnet support from kernel	2023-06-21 15:44:10 +02:00
socket.c	net: prevent address rewrite in kernel_bind()	2023-10-25 11:53:18 +02:00
sysctl_net.c