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linux/net/ipv4
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Jibin Zhang 426ca15c7f net: fix segmentation of forwarding fraglist GRO 
This patch enhances GSO segment handling by properly checking
the SKB_GSO_DODGY flag for frag_list GSO packets, addressing
low throughput issues observed when a station accesses IPv4
servers via hotspots with an IPv6-only upstream interface.

Specifically, it fixes a bug in GSO segmentation when forwarding
GRO packets containing a frag_list. The function skb_segment_list
cannot correctly process GRO skbs that have been converted by XLAT,
since XLAT only translates the header of the head skb. Consequently,
skbs in the frag_list may remain untranslated, resulting in protocol
inconsistencies and reduced throughput.

To address this, the patch explicitly sets the SKB_GSO_DODGY flag
for GSO packets in XLAT's IPv4/IPv6 protocol translation helpers
(bpf_skb_proto_4_to_6 and bpf_skb_proto_6_to_4). This marks GSO
packets as potentially modified after protocol translation. As a
result, GSO segmentation will avoid using skb_segment_list and
instead falls back to skb_segment for packets with the SKB_GSO_DODGY
flag. This ensures that only safe and fully translated frag_list
packets are processed by skb_segment_list, resolving protocol
inconsistencies and improving throughput when forwarding GRO packets
converted by XLAT.

Signed-off-by: Jibin Zhang <jibin.zhang@mediatek.com>
Fixes: 9fd1ff5d2a ("udp: Support UDP fraglist GRO/GSO.")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260126152114.1211-1-jibin.zhang@mediatek.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-01-29 14:40:12 +01:00
..
netfilter netfilter: nf_reject: don't reply to icmp error messages 2025-09-11 15:40:55 +02:00
af_inet.c net: factor-out _sk_charge() helper 2025-11-24 19:49:40 -08:00
ah4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
arp.c arp: do not assume dev_hard_header() does not change skb->head 2026-01-08 09:04:24 -08:00
bpf_tcp_ca.c tcp: Pass flags to __tcp_send_ack 2025-03-17 13:56:38 +00:00
cipso_ipv4.c ipv4: icmp: Pass IPv4 control block structure as an argument to __icmp_send() 2025-09-11 12:22:38 +02:00
datagram.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
devinet.c ipv4: Fix NULL vs error pointer check in inet_blackhole_dev_init() 2025-09-03 16:58:44 -07:00
esp4.c tcp: Don't pass hashinfo to socket lookup helpers. 2025-08-25 17:53:35 -07:00
esp4_offload.c xfrm: Fix inner mode lookup in tunnel mode GSO segmentation 2025-12-04 09:54:53 +01:00
fib_frontend.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_lookup.h
fib_notifier.c net: do not acquire rtnl in fib_seq_sum() 2024-10-11 15:35:05 -07:00
fib_rules.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_semantics.c net: fib: restore ECMP balance from loopback 2025-12-30 11:07:38 +01:00
fib_trie.c ipv4: Fix reference count leak when using error routes with nexthop objects 2025-12-30 10:39:22 +01:00
fou_bpf.c ip_tunnel: convert __be16 tunnel flags to bitmaps 2024-04-01 10:49:28 +01:00
fou_core.c gue: Fix skb memleak with inner IP protocol 0. 2026-01-17 16:00:23 -08:00
fou_nl.c fou: Don't allow 0 for FOU_ATTR_IPPROTO. 2026-01-17 16:00:24 -08:00
fou_nl.h tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
gre_demux.c net: ip_gre: Fix spelling mistake "demultiplexor" -> "demultiplexer" 2025-04-24 18:20:40 -07:00
gre_offload.c net: gro: rename skb_gro_header_hard() 2024-03-05 13:30:11 +01:00
icmp.c ipv4: icmp: Add RFC 5837 support 2025-10-29 18:28:29 -07:00
igmp.c ipv4: adopt dst_dev, skb_dst_dev and skb_dst_dev_net[_rcu] 2025-07-02 14:32:30 -07:00
igmp_internal.h netlink: support dumping IPv4 multicast addresses 2025-02-11 11:26:53 +01:00
inet_connection_sock.c tcp: remove icsk->icsk_retransmit_timer 2025-11-25 19:28:29 -08:00
inet_diag.c tcp: introduce icsk->icsk_keepalive_timer 2025-11-25 19:28:29 -08:00
inet_fragment.c inet: frags: drop fraglist conntrack references 2026-01-04 10:58:04 -08:00
inet_hashtables.c inet: Avoid ehash lookup race in inet_ehash_insert() 2025-10-17 16:08:43 -07:00
inet_timewait_sock.c inet: Avoid ehash lookup race in inet_twsk_hashdance_schedule() 2025-10-17 16:08:43 -07:00
inetpeer.c inetpeer: use EXPORT_IPV6_MOD[_GPL]() 2025-02-14 13:09:39 -08:00
ip_forward.c
ip_fragment.c inet: frags: flush pending skbs in fqdir_pre_exit() 2025-12-10 01:15:27 -08:00
ip_gre.c ipv4: ip_gre: make ipgre_header() robust 2026-01-10 12:06:22 -08:00
ip_input.c net: ipv4: Remove extern udp_v4_early_demux()/tcp_v4_early_demux() in .c files 2025-10-29 17:05:30 -07:00
ip_options.c net: Switch to skb_dstref_steal/skb_dstref_restore for ip_route_input callers 2025-08-19 17:54:35 -07:00
ip_output.c net: psp: don't assume reply skbs will have a socket 2025-10-03 10:23:50 -07:00
ip_sockglue.c Networking changes for 6.14. 2025-01-22 08:28:57 -08:00
ip_tunnel.c ipv4: ip_tunnel: spread netdev_lockdep_set_classes() 2026-01-08 18:02:35 -08:00
ip_tunnel_core.c tunnels: reset the GSO metadata before reusing the skb 2025-09-09 13:03:33 +02:00
ip_vti.c ipv4: adopt dst_dev, skb_dst_dev and skb_dst_dev_net[_rcu] 2025-07-02 14:32:30 -07:00
ipcomp.c xfrm: delete x->tunnel as we delete x 2025-07-08 13:28:27 +02:00
ipconfig.c net: ipconfig: Replace strncpy with strscpy in ic_proto_name 2025-11-28 20:19:16 -08:00
ipip.c netfilter: flowtable: Add IPIP rx sw acceleration 2025-11-28 00:00:38 +00:00
ipmr.c ipv4: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
ipmr_base.c ipmr: do not call mr_mfc_uses_dev() for unres entries 2025-01-23 07:08:13 -08:00
Kconfig tcp: Convert tcp-md5 to use MD5 library instead of crypto_ahash 2025-10-17 17:14:54 -07:00
Makefile bpfilter: remove bpfilter 2024-01-04 10:23:10 -08:00
metrics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-06-05 10:06:00 +01:00
netfilter.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
netlink.c
nexthop.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-25 11:00:59 -07:00
ping.c inet: ping: Fix icmp out counting 2026-01-04 09:48:53 -08:00
proc.c ipv4: snmp: do not use SNMP_MIB_SENTINEL anymore 2025-09-08 18:06:20 -07:00
protocol.c
raw.c net: Convert proto callbacks from sockaddr to sockaddr_unsized 2025-11-04 19:10:33 -08:00
raw_diag.c inet_diag: change inet_diag_bc_sk() first argument 2025-08-29 19:29:24 -07:00
route.c dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list() 2026-01-13 19:08:18 -08:00
syncookies.c tcp: accecn: AccECN negotiation 2025-09-18 08:47:51 +02:00
sysctl_net_ipv4.c tcp: add net.ipv4.tcp_rcvbuf_low_rtt 2025-11-20 17:44:23 -08:00
tcp.c net: do not write to msg_get_inq in callee 2026-01-08 08:45:13 -08:00
tcp_ao.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-09-18 11:26:06 -07:00
tcp_bbr.c tcp: Add new args for cong_control in tcp_congestion_ops 2024-05-02 16:26:56 -07:00
tcp_bic.c
tcp_bpf.c tcp_bpf: Call sk_msg_free() when tcp_bpf_send_verdict() fails to allocate psock->cork. 2025-09-10 06:53:56 -07:00
tcp_cdg.c tcp: cdg: remove redundant __GFP_NOWARN 2025-08-12 14:05:43 -07:00
tcp_cong.c tcp: only release congestion control if it has been initialized 2024-10-31 18:22:48 -07:00
tcp_cubic.c tcp_cubic: fix incorrect HyStart round start detection 2025-01-20 12:26:41 +00:00
tcp_dctcp.c tcp: helpers for ECN mode handling 2025-03-17 13:54:11 +00:00
tcp_dctcp.h tcp: Pass flags to __tcp_send_ack 2025-03-17 13:56:38 +00:00
tcp_diag.c inet_diag: change inet_diag_bc_sk() first argument 2025-08-29 19:29:24 -07:00
tcp_fastopen.c tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check() 2025-08-29 19:36:32 -07:00
tcp_highspeed.c
tcp_htcp.c tcp: Use clamp() in htcp_alpha_update() 2024-08-06 12:16:25 -07:00
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: add net.ipv4.tcp_rcvbuf_low_rtt 2025-11-20 17:44:23 -08:00
tcp_ipv4.c tcp: introduce icsk->icsk_keepalive_timer 2025-11-25 19:28:29 -08:00
tcp_lp.c net: tcp_lp: fix kernel-doc warnings and update outdated reference links 2025-10-28 17:52:44 -07:00
tcp_metrics.c Networking changes for 6.18. 2025-10-02 15:17:01 -07:00
tcp_minisocks.c tcp: Don't reinitialise tw->tw_transparent in tcp_time_wait(). 2025-11-18 18:00:38 -08:00
tcp_nv.c
tcp_offload.c net: fix segmentation of forwarding fraglist GRO 2026-01-29 14:40:12 +01:00
tcp_output.c net/smc: bpf: Introduce generic hook for handshake flow 2025-11-10 11:19:41 -08:00
tcp_plb.c
tcp_rate.c
tcp_recovery.c tcp: update the outdated ref draft-ietf-tcpm-rack 2025-07-08 09:01:52 -07:00
tcp_scalable.c
tcp_sigpool.c net/tcp_sigpool: Use nested-BH locking for sigpool_scratch. 2024-06-24 16:41:22 -07:00
tcp_timer.c tcp: remove icsk->icsk_retransmit_timer 2025-11-25 19:28:29 -08:00
tcp_ulp.c
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00
udp.c udp: call skb_orphan() before skb_attempt_defer_free() 2026-01-06 17:05:17 -08:00
udp_bpf.c
udp_diag.c inet_diag: change inet_diag_bc_sk() first argument 2025-08-29 19:29:24 -07:00
udp_impl.h udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
udp_offload.c net: fix segmentation of forwarding fraglist GRO 2026-01-29 14:40:12 +01:00
udp_tunnel_core.c net: Convert proto_ops connect() callbacks to use sockaddr_unsized 2025-11-04 19:10:32 -08:00
udp_tunnel_nic.c udp_tunnel: use netdev_warn() instead of netdev_WARN() 2025-09-11 19:09:48 -07:00
udp_tunnel_stub.c
udplite.c udp: move udp_memory_allocated into net_aligned_data 2025-07-02 14:22:02 -07:00
xfrm4_input.c xfrm: Set transport header to fix UDP GRO handling 2025-07-02 09:19:56 +02:00
xfrm4_output.c ipv4: adopt dst_dev, skb_dst_dev and skb_dst_dev_net[_rcu] 2025-07-02 14:32:30 -07:00
xfrm4_policy.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
xfrm4_protocol.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_state.c
xfrm4_tunnel.c net: fill in MODULE_DESCRIPTION()s for ipv4 modules 2024-02-09 14:12:02 -08:00