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linux/net/ipv4
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Yan Zhai eaf4268850 udp: gso: do not drop small packets when PMTU reduces 
[ Upstream commit 235174b2be ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-02-17 09:40:12 +01:00
..
bpfilter net: Use umd_cleanup_helper() 2023-05-31 13:06:57 +02:00
netfilter netfilter: fib: check correct rtable in vrf setups 2024-10-17 15:24:28 +02:00
af_inet.c net: inet: do not leave a dangling sk pointer in inet_create() 2024-12-14 20:00:04 +01:00
ah4.c net: ipv4: Remove completion function scaffolding 2023-02-13 18:35:15 +08:00
arp.c arp: Prevent overflow in arp_req_get(). 2024-03-01 13:35:08 +01:00
bpf_tcp_ca.c bpf: Drop useless btf_vmlinux in bpf_tcp_ca 2023-07-18 17:31:10 -07:00
cipso_ipv4.c net: use unrcu_pointer() helper 2024-12-09 10:32:10 +01:00
datagram.c ipv4: fix data-races around inet->inet_id 2023-08-20 11:40:49 +01:00
devinet.c ipv4: give an IPv4 dev to blackhole_netdev 2024-11-01 01:58:20 +01:00
esp4.c net: esp: cleanup esp_output_tail_tcp() in case of unsupported ESPINTCP 2024-08-03 08:53:36 +02:00
esp4_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-06-22 18:40:38 -07:00
fib_frontend.c ipv4: Mask upper DSCP bits and ECN bits in NETLINK_FIB_LOOKUP family 2024-10-10 11:57:26 +02:00
fib_lookup.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
fib_notifier.c net: ipv4: remove superfluous header files from fib_notifier.c 2021-09-28 17:32:56 -07:00
fib_rules.c ipv4: remove unnecessary type castings 2022-04-30 15:12:58 +01:00
fib_semantics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-09-08 07:54:45 +02:00
fib_trie.c ipv4: Fix incorrect TOS in route get reply 2024-08-03 08:54:05 +02:00
fou_bpf.c bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs 2023-04-12 16:40:39 -07:00
fou_core.c fou: fix initialization of grc 2024-09-18 19:24:09 +02:00
fou_nl.c net: ynl: prefix uAPI header include with uapi/ 2023-05-26 10:30:14 +01:00
fou_nl.h net: ynl: prefix uAPI header include with uapi/ 2023-05-26 10:30:14 +01:00
gre_demux.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
gre_offload.c net: move gso declarations and functions to their own files 2023-06-10 00:11:41 -07:00
icmp.c inetpeer: do not get a refcount in inet_getpeer() 2025-02-08 09:51:53 +01:00
igmp.c ipv4: igmp: fix refcnt uaf issue when receiving igmp query packet 2023-12-08 08:52:21 +01:00
inet_connection_sock.c tcp: Fix use-after-free of nreq in reqsk_timer_handler(). 2024-12-09 10:32:35 +01:00
inet_diag.c sock_diag: allow concurrent operation in sock_diag_rcv_msg() 2024-12-09 10:32:10 +01:00
inet_fragment.c inet: inet_defrag: prevent sk release while still in use 2024-04-10 16:35:44 +02:00
inet_hashtables.c tcp: Fix refcnt handling in __inet_hash_connect(). 2024-03-26 18:20:08 -04:00
inet_timewait_sock.c tcp/dccp: do not care about families in inet_twsk_purge() 2024-08-29 17:33:46 +02:00
inetpeer.c inetpeer: do not get a refcount in inet_getpeer() 2025-02-08 09:51:53 +01:00
ip_forward.c net: ipv4, ipv6: fix IPSTATS_MIB_OUTOCTETS increment duplicated 2023-08-30 09:44:09 +01:00
ip_fragment.c inetpeer: do not get a refcount in inet_getpeer() 2025-02-08 09:51:53 +01:00
ip_gre.c ipv4: ip_gre: Fix drops of small packets in ipgre_xmit 2024-10-10 11:57:17 +02:00
ip_input.c ipv4: ignore dst hint for multipath routes 2023-09-01 08:11:51 +01:00
ip_options.c ipv4: drop fragmentation code from ip_options_build() 2022-01-29 17:53:07 +00:00
ip_output.c net-timestamp: make sk_tskey more predictable in error path 2024-12-14 19:59:35 +01:00
ip_sockglue.c ipmr: fix kernel panic when forwarding mcast packets 2024-02-05 20:14:35 +00:00
ip_tunnel.c ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_find() 2025-02-01 18:37:55 +01:00
ip_tunnel_core.c tunnels: fix out of bounds access when building IPv6 PMTU error 2024-02-16 19:10:48 +01:00
ip_vti.c ip_vti: fix potential slab-use-after-free in decode_session6 2023-07-11 11:06:08 +02:00
ipcomp.c xfrm: ipcomp: add extack to ipcomp{4,6}_init_state 2022-09-29 07:18:00 +02:00
ipconfig.c net: ipconfig: move ic_nameservers_fallback into #ifdef block 2023-05-22 11:17:55 +01:00
ipip.c ipip,ip_tunnel,sit: Add FOU support for externally controlled ipip devices 2023-04-12 16:40:39 -07:00
ipmr.c inet: ipmr: fix data-races 2025-02-08 09:52:02 +01:00
ipmr_base.c ipmr: do not call mr_mfc_uses_dev() for unres entries 2025-02-08 09:52:29 +01:00
Kconfig tcp: configurable source port perturb table size 2022-11-16 13:02:04 +00:00
Makefile bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs 2023-04-12 16:40:39 -07:00
metrics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-09-08 07:54:45 +02:00
netfilter.c netfilter: Use l3mdev flow key when re-routing mangled packets 2022-05-16 13:03:29 +02:00
netlink.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nexthop.c net: nexthop: Initialize all fields in dumped nexthops 2024-08-03 08:54:38 +02:00
ping.c bpf: Propagate modified uaddrlen from cgroup sockaddr programs 2024-01-31 16:19:04 -08:00
proc.c net: fix IPSTATS_MIB_OUTPKGS increment in OutForwDatagrams. 2024-04-03 15:28:39 +02:00
protocol.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
raw.c ipv4: Fix uninit-value access in __ip_make_skb() 2024-05-17 12:02:07 +02:00
raw_diag.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-06 12:01:20 -07:00
route.c inetpeer: do not get a refcount in inet_getpeer() 2025-02-08 09:51:53 +01:00
syncookies.c tcp: annotate data-races around tp->window_clamp 2024-08-11 12:47:19 +02:00
sysctl_net_ipv4.c networking: Update to register_net_sysctl_sz 2023-08-15 15:26:18 -07:00
tcp.c net: use unrcu_pointer() helper 2024-12-09 10:32:10 +01:00
tcp_bbr.c bpf: Add __bpf_kfunc tag to all kfuncs 2023-02-02 00:25:14 +01:00
tcp_bic.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_bpf.c tcp_bpf: Add sk_rmem_alloc related logic for tcp_bpf ingress redirection 2025-01-02 10:32:00 +01:00
tcp_cdg.c Random number generator fixes for Linux 6.1-rc1. 2022-10-16 15:27:07 -07:00
tcp_cong.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-09-08 07:54:45 +02:00
tcp_cubic.c tcp_cubic: fix incorrect HyStart round start detection 2025-02-08 09:52:04 +01:00
tcp_dctcp.c tcp: Fix shift-out-of-bounds in dctcp_update_alpha(). 2024-06-12 11:12:48 +02:00
tcp_dctcp.h tcp: refactor DCTCP ECN ACK handling 2018-10-10 22:26:00 -07:00
tcp_diag.c tcp: Access &tcp_hashinfo via net. 2022-09-20 10:21:49 -07:00
tcp_fastopen.c net: use unrcu_pointer() helper 2024-12-09 10:32:10 +01:00
tcp_highspeed.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_htcp.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_hybla.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_illinois.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_input.c net: fix memory leak in tcp_conn_request() 2025-01-09 13:31:59 +01:00
tcp_ipv4.c tcp: Annotate data-race around sk->sk_mark in tcp_v4_send_reset 2025-01-17 13:36:14 +01:00
tcp_lp.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_metrics.c tcp_metrics: optimize tcp_metrics_flush_all() 2024-08-19 06:04:25 +02:00
tcp_minisocks.c tcp: new TCP_INFO stats for RTO events 2024-10-17 15:24:23 +02:00
tcp_nv.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_offload.c net: drop bad gso csum_start and offset in virtio_net_hdr 2024-08-14 13:58:48 +02:00
tcp_output.c tcp: correct handling of extreme memory squeeze 2025-02-08 09:52:31 +01:00
tcp_plb.c prandom: remove prandom_u32_max() 2022-12-20 03:13:45 +01:00
tcp_rate.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-04-28 13:02:01 -07:00
tcp_recovery.c tcp: fix excessive TLP and RACK timeouts from HZ rounding 2023-10-17 17:25:42 -07:00
tcp_scalable.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_timer.c tcp: new TCP_INFO stats for RTO events 2024-10-17 15:24:23 +02:00
tcp_ulp.c net/ulp: use consistent error code when blocking ULP 2023-01-19 09:26:16 -08:00
tcp_vegas.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_vegas.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tcp_veno.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_westwood.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tcp_yeah.c tcp: add accessors to read/set tp->snd_cwnd 2022-04-06 12:05:41 -07:00
tunnel4.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
udp.c udp: gso: do not drop small packets when PMTU reduces 2025-02-17 09:40:12 +01:00
udp_bpf.c bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() 2023-03-03 17:25:15 +01:00
udp_diag.c udp: Access &udp_table via net. 2022-11-16 09:43:35 +00:00
udp_impl.h sock: Remove ->sendpage*() in favour of sendmsg(MSG_SPLICE_PAGES) 2023-06-24 15:50:13 -07:00
udp_offload.c gso: fix udp gso fraglist segmentation after pull from frag_list 2024-10-10 11:57:56 +02:00
udp_tunnel_core.c udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO 2023-11-20 11:58:56 +01:00
udp_tunnel_nic.c udp_tunnel: Add checks for nla_nest_start() in __udp_tunnel_nic_dump_write() 2022-11-29 08:44:24 -08:00
udp_tunnel_stub.c udp_tunnel: add central NIC RX port offload infrastructure 2020-07-10 13:54:00 -07:00
udplite.c udplite: remove UDPLITE_BIT 2023-11-20 11:58:56 +01:00
xfrm4_input.c xfrm: Preserve vlan tags for transport mode software GRO 2024-05-17 12:02:20 +02:00
xfrm4_output.c xfrm: fix unused variable warning if CONFIG_NETFILTER=n 2020-05-11 15:12:27 +02:00
xfrm4_policy.c xfrm: respect ip protocols rules criteria when performing dst lookups 2024-11-01 01:58:28 +01:00
xfrm4_protocol.c net: xfrm: unexport __init-annotated xfrm4_protocol_init() 2022-06-08 10:10:13 -07:00
xfrm4_state.c xfrm: remove output_finish indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm4_tunnel.c xfrm: tunnel: add extack to ipip_init_state, xfrm6_tunnel_init_state 2022-09-29 07:18:00 +02:00