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linux-kernelorg-stable/net/ipv6
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Yan Zhai 235174b2be udp: gso: do not drop small packets when PMTU reduces 
Commit 4094871db1 ("udp: only do GSO if # of segs > 1") avoided GSO
for small packets. But the kernel currently dismisses GSO requests only
after checking MTU/PMTU on gso_size. This means any packets, regardless
of their payload sizes, could be dropped when PMTU becomes smaller than
requested gso_size. We encountered this issue in production and it
caused a reliability problem that new QUIC connection cannot be
established before PMTU cache expired, while non GSO sockets still
worked fine at the same time.

Ideally, do not check any GSO related constraints when payload size is
smaller than requested gso_size, and return EMSGSIZE instead of EINVAL
on MTU/PMTU check failure to be more specific on the error cause.

Fixes: 4094871db1 ("udp: only do GSO if # of segs > 1")
Signed-off-by: Yan Zhai <yan@cloudflare.com>
Suggested-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2025-02-03 10:13:27 +00:00
..
ila ila: serialize calls to nf_register_net_hooks() 2025-01-02 18:42:32 -08:00
netfilter netfilter pull request 24-11-07 2024-11-07 12:46:04 +01:00
Kconfig net: ipv6: select DST_CACHE from IPV6_RPL_LWTUNNEL 2024-09-22 19:52:07 +01:00
Makefile
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addrconf.c ipv6: Convert inet6_rtm_deladdr() to per-netns RTNL. 2025-01-20 12:16:06 -08:00
addrconf_core.c
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addrlabel.c ipv6: Use rtnl_register_many(). 2024-10-15 18:52:26 -07:00
af_inet6.c net: inet6: do not leave a dangling sk pointer in inet6_create() 2024-10-15 18:43:08 -07:00
ah6.c
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anycast.c netlink: add IPv6 anycast join/leave notifications 2025-01-09 12:54:45 +01:00
calipso.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
datagram.c
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esp6.c ipsec-2025-01-27 2025-01-27 15:15:12 -08:00
esp6_offload.c xfrm: Add an inbound percpu state cache. 2024-10-29 11:56:18 +01:00
exthdrs.c
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exthdrs_core.c
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exthdrs_offload.c
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fib6_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib6_rules.c ipv6: fib_rules: Add flow label support 2024-12-19 16:02:22 +01:00
fou6.c
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icmp.c inetpeer: do not get a refcount in inet_getpeer() 2024-12-17 19:37:48 -08:00
inet6_connection_sock.c
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inet6_hashtables.c inet6: constify 'struct net' parameter of various lookup helpers 2024-08-05 16:27:26 -07:00
ioam6.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
ioam6_iptunnel.c net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels 2025-02-01 16:55:44 -08:00
ip6_checksum.c
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ip6_fib.c ipv6: Fix soft lockups in fib6_select_path under high next hop churn 2024-11-11 15:26:10 -08:00
ip6_flowlabel.c
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ip6_gre.c netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local 2024-09-03 11:36:43 +02:00
ip6_icmp.c
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ip6_input.c net/ipv6: make use of the helper macro LIST_HEAD() 2024-09-06 18:10:21 -07:00
ip6_offload.c net: gro: initialize network_offset in network layer 2024-05-27 16:46:59 -07:00
ip6_offload.h
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ip6_output.c inetpeer: do not get a refcount in inet_getpeer() 2024-12-17 19:37:48 -08:00
ip6_tunnel.c ipv4: Convert ip_route_input() to dscp_t. 2024-10-03 16:21:21 -07:00
ip6_udp_tunnel.c
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ip6_vti.c
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ip6mr.c inet: ipmr: fix data-races 2025-01-15 15:07:23 -08:00
ipcomp6.c
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ipv6_sockglue.c ipv6: avoid indirect calls for SOL_IP socket options 2024-08-26 14:53:50 -07:00
mcast.c netlink: correct nlmsg size for multicast notifications 2024-12-23 10:26:43 -08:00
mcast_snoop.c
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mip6.c
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ndisc.c inetpeer: do not get a refcount in inet_getpeer() 2024-12-17 19:37:48 -08:00
netfilter.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-06-13 13:13:46 -07:00
output_core.c
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ping.c sock: support SO_PRIORITY cmsg 2024-12-16 18:13:44 -08:00
proc.c minmax: add a few more MIN_T/MAX_T users 2024-07-28 13:41:14 -07:00
protocol.c
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raw.c sock: support SO_PRIORITY cmsg 2024-12-16 18:13:44 -08:00
reassembly.c net: Rename mono_delivery_time to tstamp_type for scalabilty 2024-05-23 14:14:23 -07:00
route.c ipv6: Add flow label to route get requests 2024-12-19 16:02:22 +01:00
rpl.c
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rpl_iptunnel.c net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels 2025-02-01 16:55:44 -08:00
seg6.c ipv6: sr: restruct ifdefines 2024-05-30 18:29:38 -07:00
seg6_hmac.c ipv6: sr: fix memleak in seg6_hmac_init_algo 2024-05-21 13:16:25 +02:00
seg6_iptunnel.c net: ipv6: fix dst ref loops in rpl, seg6 and ioam6 lwtunnels 2025-02-01 16:55:44 -08:00
seg6_local.c net: ip: make ip_route_input() return drop reasons 2024-11-12 11:24:51 +01:00
sit.c ipv6: sit: Unmask upper DSCP bits in ipip6_tunnel_bind_dev() 2024-09-04 16:57:11 -07:00
syncookies.c tcp: use sk_skb_reason_drop to free rx packets 2024-06-19 12:44:22 +01:00
sysctl_net_ipv6.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
tcp_ao.c
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tcp_ipv6.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-11-14 11:29:15 -08:00
tcpv6_offload.c net: gso: fix tcp fraglist segmentation after pull from frag_list 2024-10-02 17:21:47 -07:00
tunnel6.c
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udp.c udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
udp_impl.h
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udp_offload.c
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udplite.c
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xfrm6_input.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-05-09 10:01:01 -07:00
xfrm6_output.c xfrm: Fix the usage of skb->sk 2025-01-20 07:06:53 +01:00
xfrm6_policy.c xfrm: respect ip protocols rules criteria when performing dst lookups 2024-09-23 07:02:07 +02:00
xfrm6_protocol.c
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xfrm6_state.c
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xfrm6_tunnel.c
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