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
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ila	ila: do not generate empty messages in ila_xlat_nl_cmd_get_mapping()	2023-03-17 08:32:50 +01:00
netfilter	treewide: Remove uninitialized_var() usage	2023-06-09 10:29:01 +02:00
addrconf.c	net: ipv6/addrconf: avoid integer underflow in ipv6_create_tempaddr	2023-09-23 10:59:58 +02:00
addrconf_core.c
addrlabel.c	ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network	2022-11-25 17:42:05 +01:00
af_inet6.c	dccp: Call inet6_destroy_sock() via sk->sk_destruct().	2023-04-26 11:24:05 +02:00
ah6.c	ah6: fix error return code in ah6_input()	2020-11-24 13:28:55 +01:00
anycast.c
calipso.c	cipso,calipso: resolve a number of problems with the DOI refcounts	2021-03-17 17:03:35 +01:00
datagram.c	ipv6: Fix datagram socket connection with DSCP.	2023-02-22 12:50:41 +01:00
esp6.c	net: ipv6: fix return value check in esp_remove_trailer	2023-10-25 11:53:21 +02:00
esp6_offload.c	xfrm: Linearize the skb after offloading if needed.	2023-06-28 10:18:38 +02:00
exthdrs.c	ipv6: fix out-of-bound access in ip6_parse_tlv()	2021-07-14 16:53:33 +02:00
exthdrs_core.c	ipv6: Fix out-of-bounds access in ipv6_find_tlv()	2023-05-30 12:44:10 +01:00
exthdrs_offload.c
fib6_notifier.c
fib6_rules.c	ipv6: fix memory leak in fib6_rule_suppress	2021-12-08 09:01:13 +01:00
fou6.c
icmp.c	icmp6: Fix null-ptr-deref of ip6_null_entry->rt6i_idev in icmp6_dev().	2023-07-27 08:37:31 +02:00
inet6_connection_sock.c
inet6_hashtables.c	secure_seq: use the 64 bits of the siphash for port offset calculation	2022-06-06 08:33:49 +02:00
ip6_checksum.c
ip6_fib.c	ipv6: annotate accesses to fn->fn_sernum	2022-02-01 17:24:38 +01:00
ip6_flowlabel.c	treewide: Remove uninitialized_var() usage	2023-06-09 10:29:01 +02:00
ip6_gre.c	net:ipv6: check return value of pskb_trim()	2023-07-27 08:37:43 +02:00
ip6_icmp.c	net: icmp: pass zeroed opts from icmp{,v6}_ndo_send before sending	2021-03-04 10:26:53 +01:00
ip6_input.c	tcp/udp: Make early_demux back namespacified.	2022-11-10 17:57:55 +01:00
ip6_offload.c	gso: do not skip outer ip header in case of ipip and net_failover	2022-03-02 11:41:06 +01:00
ip6_offload.h
ip6_output.c	ipv6: avoid atomic fragment on GSO packets	2023-11-20 10:30:10 +01:00
ip6_tunnel.c	net: tunnels: annotate lockless accesses to dev->needed_headroom	2023-03-22 13:28:05 +01:00
ip6_udp_tunnel.c
ip6_vti.c	ip6_vti: fix slab-use-after-free in decode_session6	2023-08-30 16:27:16 +02:00
ip6mr.c	ip6mr: Fix skb_under_panic in ip6mr_cache_report()	2023-08-11 11:53:57 +02:00
ipcomp6.c
ipv6_sockglue.c	udp: Call inet6_destroy_sock() in setsockopt(IPV6_ADDRFORM).	2023-04-26 11:24:05 +02:00
Kconfig	net: ipv6: fix kconfig dependency warning for IPV6_SEG6_HMAC	2020-09-26 18:03:13 +02:00
Makefile
mcast.c	mld: fix panic in mld_newpack()	2021-06-03 08:59:14 +02:00
mcast_snoop.c	net: bridge: mcast: fix broken length + header check for MRDv6 Adv.	2021-05-14 09:44:32 +02:00
mip6.c
ndisc.c	ipv6: adjust ndisc_is_useropt() to also return true for PIO	2023-08-16 18:19:22 +02:00
netfilter.c	netfilter: use actual socket sk rather than skb sk when routing harder	2020-11-18 19:20:17 +01:00
output_core.c	ipv6: use prandom_u32() for ID generation	2021-07-19 08:53:09 +02:00
ping.c	ping6: Fix send to link-local addresses with VRF.	2023-06-21 15:44:11 +02:00
proc.c
protocol.c
raw.c	ipv{4,6}/raw: fix output xfrm lookup wrt protocol	2023-06-05 08:17:33 +02:00
reassembly.c	ipv6: record frag_max_size in atomic fragments in input path	2021-06-03 08:59:15 +02:00
route.c	ipv6: Add lwtunnel encap size of all siblings in nexthop calculation	2023-03-11 16:44:11 +01:00
seg6.c	ipv6: sr: fix out-of-bounds read when setting HMAC data.	2022-09-15 12:04:55 +02:00
seg6_hmac.c	net: ipv6: unexport __init-annotated seg6_hmac_net_init()	2022-07-07 17:36:49 +02:00
seg6_iptunnel.c	seg6: fix skb checksum evaluation in SRH encapsulation/insertion	2022-07-21 20:59:23 +02:00
seg6_local.c	seg6: fix skb checksum in SRv6 End.B6 and End.B6.Encaps behaviors	2022-07-21 20:59:23 +02:00
sit.c	sit: update dev->needed_headroom in ipip6_tunnel_bind_dev()	2023-05-17 11:35:58 +02:00
syncookies.c	tcp: Fix data-races around sysctl_tcp_syncookies.	2022-07-29 17:14:13 +02:00
sysctl_net_ipv6.c	ipv6: Fix sysctl max for fib_multipath_hash_policy	2020-09-12 14:18:55 +02:00
tcp_ipv6.c	inet6: Remove inet6_destroy_sock() in sk->sk_prot->destroy().	2023-04-26 11:24:05 +02:00
tcpv6_offload.c
tunnel6.c
udp.c	udp6: fix udp6_ehashfn() typo	2023-07-27 08:37:31 +02:00
udp_impl.h	tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().	2023-04-26 11:24:05 +02:00
udp_offload.c
udplite.c	udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().	2023-05-30 12:44:09 +01:00
xfrm6_input.c
xfrm6_output.c	xfrm: fix tunnel model fragmentation behavior	2022-04-15 14:17:56 +02:00
xfrm6_policy.c	xfrm6: fix inet6_dev refcount underflow problem	2023-10-25 11:53:25 +02:00
xfrm6_protocol.c
xfrm6_state.c
xfrm6_tunnel.c