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linux-kernelorg-stable/net/ipv4
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Eric Dumazet 21b29e74ff tcp: take care of zero tp->window_clamp in tcp_set_rcvlowat() 
Some applications (like selftests/net/tcp_mmap.c) call SO_RCVLOWAT
on their listener, before accept().

This has an unfortunate effect on wscale selection in
tcp_select_initial_window() during 3WHS.

For instance, tcp_mmap was negotiating wscale 4, regardless
of tcp_rmem[2] and sysctl_rmem_max.

Do not change tp->window_clamp if it is zero
or bigger than our computed value.

Zero value is special, it allows tcp_select_initial_window()
to enable autotuning.

Note that SO_RCVLOWAT use on listener is probably not wise,
because tp->scaling_ratio has a default value, possibly wrong.

Fixes: d1361840f8 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20251003184119.2526655-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2025-10-06 13:08:48 -07:00
..
netfilter netfilter: nf_reject: don't reply to icmp error messages 2025-09-11 15:40:55 +02:00
Kconfig net: Retire DCCP socket. 2025-04-11 18:58:10 -07:00
Makefile
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af_inet.c net: gro: remove unnecessary df checks 2025-09-25 12:42:49 +02:00
ah4.c
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arp.c net: set net.core.rmem_max and net.core.wmem_max to 4 MB 2025-08-20 19:35:00 -07:00
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: dst: annotate data-races around dst->obsolete 2025-07-02 14:32:29 -07:00
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
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fib_frontend.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_lookup.h
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fib_notifier.c
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fib_rules.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
fib_semantics.c net: s/dev_get_flags/netif_get_flags/ 2025-07-18 17:27:47 -07:00
fib_trie.c ipv4: fib: Move fib_valid_key_len() to rtm_to_fib_config(). 2025-03-03 15:04:11 -08:00
fou_bpf.c
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fou_core.c net: gro: remove is_ipv6 from napi_gro_cb 2025-09-25 12:42:49 +02:00
fou_nl.c netlink: specs: fou: change local-v6/peer-v6 check 2025-09-03 15:16:49 -07:00
fou_nl.h
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gre_demux.c net: ip_gre: Fix spelling mistake "demultiplexor" -> "demultiplexer" 2025-04-24 18:20:40 -07:00
gre_offload.c
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icmp.c ipv4: icmp: Fix source IP derivation in presence of VRFs 2025-09-11 12:22:38 +02:00
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: Update bind bucket state on port release 2025-09-23 10:12:15 +02:00
inet_diag.c inet_diag: avoid cache line misses in inet_diag_bc_sk() 2025-08-29 19:29:24 -07:00
inet_fragment.c net: replace use of system_wq with system_percpu_wq 2025-09-22 17:40:30 -07:00
inet_hashtables.c tcp: Update bind bucket state on port release 2025-09-23 10:12:15 +02:00
inet_timewait_sock.c Networking changes for 6.18. 2025-10-02 15:17:01 -07:00
inetpeer.c inetpeer: use EXPORT_IPV6_MOD[_GPL]() 2025-02-14 13:09:39 -08:00
ip_forward.c
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ip_fragment.c ipv4: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
ip_gre.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
ip_input.c net: ipv4: convert ip_rcv_options to drop reasons 2025-09-19 17:35:52 -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
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ip_tunnel.c net: ipv4: Add a flags argument to iptunnel_xmit(), udp_tunnel_xmit_skb() 2025-06-17 18:18:44 -07:00
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: convert timeouts to secs_to_jiffies() 2025-07-09 19:25:01 -07:00
ipip.c ipv4: ip_tunnel: Convert ip_tunnel_delete_nets() callers to ->exit_rtnl(). 2025-04-14 17:08:42 -07:00
ipmr.c ipv4: start using dst_dev_rcu() 2025-08-29 19:36:32 -07:00
ipmr_base.c
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metrics.c
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netfilter.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
netlink.c
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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: use EXPORT_IPV6_MOD[_GPL]() 2025-09-01 13:15:14 -07:00
proc.c ipv4: snmp: do not use SNMP_MIB_SENTINEL anymore 2025-09-08 18:06:20 -07:00
protocol.c
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raw.c inet: raw: add drop_counters to raw sockets 2025-08-28 13:14:50 +02:00
raw_diag.c inet_diag: change inet_diag_bc_sk() first argument 2025-08-29 19:29:24 -07:00
route.c ipv4: icmp: Pass IPv4 control block structure as an argument to __icmp_send() 2025-09-11 12:22:38 +02:00
syncookies.c tcp: accecn: AccECN negotiation 2025-09-18 08:47:51 +02:00
sysctl_net_ipv4.c tcp: accecn: AccECN option send control 2025-09-18 08:47:52 +02:00
tcp.c tcp: take care of zero tp->window_clamp in tcp_set_rcvlowat() 2025-10-06 13:08:48 -07:00
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
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tcp_bic.c
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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
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tcp_cubic.c
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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
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tcp_htcp.c
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tcp_hybla.c
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tcp_illinois.c
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tcp_input.c tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request(). 2025-10-06 11:11:20 -07:00
tcp_ipv4.c net: psp: update the TCP MSS to reflect PSP packet overhead 2025-09-18 12:32:06 +02:00
tcp_lp.c
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tcp_metrics.c Networking changes for 6.18. 2025-10-02 15:17:01 -07:00
tcp_minisocks.c tcp: add datapath logic for PSP with inline key exchange 2025-09-18 12:32:06 +02:00
tcp_nv.c
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tcp_offload.c net: gso: restore ids of outer ip headers correctly 2025-09-25 12:42:49 +02:00
tcp_output.c tcp: prefer sk_skb_reason_drop() 2025-09-19 17:00:23 -07:00
tcp_plb.c
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tcp_rate.c
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tcp_recovery.c tcp: update the outdated ref draft-ietf-tcpm-rack 2025-07-08 09:01:52 -07:00
tcp_scalable.c
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tcp_sigpool.c
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tcp_timer.c tcp: annotate data-races around icsk->icsk_probes_out 2025-08-25 16:20:59 -07:00
tcp_ulp.c
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tcp_vegas.c
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tcp_vegas.h
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tcp_veno.c
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tcp_westwood.c
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tcp_yeah.c
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tunnel4.c
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udp.c udp: remove busylock and add per NUMA queues 2025-09-23 16:38:39 -07:00
udp_bpf.c
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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: gro: remove is_ipv6 from napi_gro_cb 2025-09-25 12:42:49 +02:00
udp_tunnel_core.c ipv4: Convert ->flowi4_tos to dscp_t. 2025-08-26 17:34:31 -07:00
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
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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
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xfrm4_state.c
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xfrm4_tunnel.c
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