WSL2-Linux-Kernel/net/ipv4
Cambda Zhu a907a389c7 tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set
[ Upstream commit 34dfde4ad8 ]

This patch replaces the tp->mss_cache check in getting TCP_MAXSEG
with tp->rx_opt.user_mss check for CLOSE/LISTEN sock. Since
tp->mss_cache is initialized with TCP_MSS_DEFAULT, checking if
it's zero is probably a bug.

With this change, getting TCP_MAXSEG before connecting will return
default MSS normally, and return user_mss if user_mss is set.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Jack Yang <mingliang@linux.alibaba.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/netdev/CANn89i+3kL9pYtkxkwxwNMzvC_w3LNUum_2=3u+UyLBmGmifHA@mail.gmail.com/#t
Signed-off-by: Cambda Zhu <cambda@linux.alibaba.com>
Link: https://lore.kernel.org/netdev/14D45862-36EA-4076-974C-EA67513C92F6@linux.alibaba.com/
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20230527040317.68247-1-cambda@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-06-09 10:32:17 +02:00
..
bpfilter net: Revert "net: optimize the sockptr_t for unified kernel/user address spaces" 2020-08-10 12:06:44 -07:00
netfilter netfilter: tproxy: fix deadlock due to missing BH disable 2023-03-17 08:48:55 +01:00
Kconfig tcp: configurable source port perturb table size 2022-12-02 17:41:11 +01:00
Makefile bpf: Clean up sockmap related Kconfigs 2021-02-26 12:28:03 -08:00
af_inet.c tcp: deny tcp_disconnect() when threads are waiting 2023-06-09 10:32:17 +02:00
ah4.c Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
arp.c ipv4: Invalidate neighbour for broadcast address upon address addition 2022-04-13 20:59:05 +02:00
bpf_tcp_ca.c bpf: Forbid bpf_ktime_get_coarse_ns and bpf_timer_* in tracing progs 2021-11-25 09:49:07 +01:00
cipso_ipv4.c cipso: Fix data-races around sysctl. 2022-07-21 21:24:21 +02:00
datagram.c udp: Update reuse->has_conns under reuseport_lock. 2022-10-29 10:12:56 +02:00
devinet.c net: Fix data-races around sysctl_devconf_inherit_init_net. 2022-08-31 17:16:44 +02:00
esp4.c esp: limit skb_page_frag_refill use to a single page 2022-04-27 14:38:52 +02:00
esp4_offload.c xfrm: replay: Fix ESN wrap around for GSO 2022-12-02 17:41:02 +01:00
fib_frontend.c ipv4: Fix incorrect table ID in IOCTL path 2023-03-22 13:31:28 +01:00
fib_lookup.h ipv4: fix data races in fib_alias_hw_flags_set 2022-02-23 12:03:10 +01:00
fib_notifier.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
fib_rules.c ipv4: convert fib_num_tclassid_users to atomic_t 2021-12-08 09:04:49 +01:00
fib_semantics.c ipv4: prevent potential spectre v1 gadget in fib_metrics_match() 2023-02-01 08:27:27 +01:00
fib_trie.c ipv4: Fix error return code in fib_table_insert() 2022-12-02 17:41:07 +01:00
fou.c fou: remove sparse errors 2021-08-31 12:03:33 +01:00
gre_demux.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
gre_offload.c ip_gre: add csum offload support for gre header 2021-01-29 20:39:14 -08:00
icmp.c icmp: guard against too small mtu 2023-04-13 16:48:18 +02:00
igmp.c igmp: Fix data-races around sysctl_igmp_qrv. 2022-08-03 12:03:48 +02:00
inet_connection_sock.c tcp: deny tcp_disconnect() when threads are waiting 2023-06-09 10:32:17 +02:00
inet_diag.c inet_diag: fix kernel-infoleak for UDP sockets 2021-12-22 09:32:40 +01:00
inet_fragment.c inet: frags: annotate races around fqdir->dead and fqdir->high_thresh 2022-01-27 11:05:35 +01:00
inet_hashtables.c inet: fix fast path in __inet_hash_connect() 2023-03-10 09:39:48 +01:00
inet_timewait_sock.c tcp: avoid the lookup process failing to get sk in ehash table 2023-02-01 08:27:13 +01:00
inetpeer.c inetpeer: Fix data-races around sysctl. 2022-07-21 21:24:21 +02:00
ip_forward.c ip: Fix data-races around sysctl_ip_fwd_update_priority. 2022-07-29 17:25:13 +02:00
ip_fragment.c inet: frags: annotate races around fqdir->dead and fqdir->high_thresh 2022-01-27 11:05:35 +01:00
ip_gre.c erspan: do not use skb_mac_header() in ndo_start_xmit() 2023-03-30 12:47:48 +02:00
ip_input.c xfrm: fix "disable_policy" on ipv4 early demux 2022-12-02 17:41:02 +01:00
ip_options.c net: clean up codestyle for net/ipv4 2020-08-25 06:28:02 -07:00
ip_output.c ipv4: Fix potential uninit variable access bug in __ip_make_skb() 2023-05-11 23:00:31 +09:00
ip_sockglue.c ipv{4,6}/raw: fix output xfrm lookup wrt protocol 2023-06-05 09:21:26 +02:00
ip_tunnel.c net: tunnels: annotate lockless accesses to dev->needed_headroom 2023-03-22 13:31:26 +01:00
ip_tunnel_core.c tunnels: do not assume mac header is set in skb_tunnel_check_pmtu() 2022-07-07 17:53:29 +02:00
ip_vti.c ip_tunnel: use ndo_siocdevprivate 2021-07-27 20:11:44 +01:00
ipcomp.c Networking changes for 5.14. 2021-06-30 15:51:09 -07:00
ipconfig.c net: ipconfig: Don't override command-line hostnames or domains 2021-06-02 13:27:03 -07:00
ipip.c ip_tunnel: use ndo_siocdevprivate 2021-07-27 20:11:44 +01:00
ipmr.c ipmr,ip6mr: acquire RTNL before calling ip[6]mr_free_table() on failure path 2022-02-16 12:56:29 +01:00
ipmr_base.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
metrics.c ipv4: prevent potential spectre v1 gadget in ip_metrics_convert() 2023-02-01 08:27:27 +01:00
netfilter.c netfilter: Dissect flow after packet mangling 2021-04-18 22:04:16 +02:00
netlink.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nexthop.c nh: fix scope used to find saddr when adding non gw nh 2022-11-03 23:59:19 +09:00
ping.c ping: fix address binding wrt vrf 2022-05-18 10:26:57 +02:00
proc.c ip: Fix data-races around sysctl_ip_default_ttl. 2022-07-29 17:25:09 +02:00
protocol.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
raw.c ipv{4,6}/raw: fix output xfrm lookup wrt protocol 2023-06-05 09:21:26 +02:00
raw_diag.c net: Use nlmsg_unicast() instead of netlink_unicast() 2021-07-13 09:28:29 -07:00
route.c ipv4: Fix data-races around sysctl_fib_multipath_hash_fields. 2022-07-29 17:25:21 +02:00
syncookies.c mptcp: remove MPTCP 'ifdef' in TCP SYN cookies 2023-01-12 11:58:52 +01:00
sysctl_net_ipv4.c tcp: restrict net.ipv4.tcp_app_win 2023-04-20 12:13:53 +02:00
tcp.c tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set 2023-06-09 10:32:17 +02:00
tcp_bbr.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_bic.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_bpf.c net: deal with most data-races in sk_wait_event() 2023-05-24 17:36:42 +01:00
tcp_cdg.c tcp: cdg: allow tcp_cdg_release() to be called multiple times 2022-11-26 09:24:50 +01:00
tcp_cong.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_cubic.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_dctcp.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_dctcp.h tcp: refactor DCTCP ECN ACK handling 2018-10-10 22:26:00 -07:00
tcp_diag.c inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data 2020-02-27 18:50:19 -08:00
tcp_fastopen.c tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout. 2022-07-29 17:25:19 +02:00
tcp_highspeed.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_htcp.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_hybla.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_illinois.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_input.c tcp: add annotations around sk->sk_shutdown accesses 2023-05-24 17:36:42 +01:00
tcp_ipv4.c tcp: fix possible sk_priority leak in tcp_v4_send_reset() 2023-05-24 17:36:50 +01:00
tcp_lp.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_metrics.c tcp: Fix data-races around sysctl_tcp_no_ssthresh_metrics_save. 2022-08-03 12:03:45 +02:00
tcp_minisocks.c tcp: tcp_check_req() can be called from process context 2023-03-11 13:57:30 +01:00
tcp_nv.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_offload.c net, gro: Set inner transport header offset in tcp/udp GRO hook 2021-08-02 10:20:56 +01:00
tcp_output.c tcp: tcp_make_synack() can be called from process context 2023-03-22 13:31:23 +01:00
tcp_rate.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_recovery.c tcp: Fix data-races around sysctl_tcp_recovery. 2022-07-29 17:25:22 +02:00
tcp_scalable.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_timer.c tcp: Fix a data-race around sysctl_tcp_thin_linear_timeouts. 2022-07-29 17:25:22 +02:00
tcp_ulp.c net/ulp: use consistent error code when blocking ULP 2023-01-24 07:22:48 +01:00
tcp_vegas.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_vegas.h
tcp_veno.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_westwood.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tcp_yeah.c tcp: add accessors to read/set tp->snd_cwnd 2022-06-14 18:36:11 +02:00
tunnel4.c net: Remove the member netns_ok 2021-05-17 15:29:35 -07:00
udp.c tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct(). 2023-04-26 13:51:54 +02:00
udp_bpf.c bpf, sockmap: Fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser() 2023-03-17 08:48:54 +01:00
udp_diag.c net: Use nlmsg_unicast() instead of netlink_unicast() 2021-07-13 09:28:29 -07:00
udp_impl.h net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
udp_offload.c fou: remove sparse errors 2021-08-31 12:03:33 +01:00
udp_tunnel_core.c net/tunnel: wait until all sk_user_data reader finish before releasing the sock 2022-12-31 13:14:19 +01:00
udp_tunnel_nic.c udp_tunnel: Fix end of loop test in udp_tunnel_nic_unregister() 2022-03-02 11:47:59 +01:00
udp_tunnel_stub.c udp_tunnel: add central NIC RX port offload infrastructure 2020-07-10 13:54:00 -07:00
udplite.c udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated(). 2023-05-30 13:55:31 +01:00
xfrm4_input.c xfrm: state: remove extract_input indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +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 net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2019-12-24 22:28:54 -08:00
xfrm4_protocol.c net: xfrm: unexport __init-annotated xfrm4_protocol_init() 2022-06-14 18:36:18 +02:00
xfrm4_state.c xfrm: remove output_finish indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm4_tunnel.c xfrm: remove description from xfrm_type struct 2021-06-09 09:38:52 +02:00