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linux/net/ipv4
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Cambda Zhu dfb80ebc3b tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set 
[ Upstream commit 34dfde4ad87b84d21278a7e19d92b5b2c68e6c4d ]

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: 1da177e4c3f4 ("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 10:30:06 +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 08:45:11 +01:00
af_inet.c
tcp: deny tcp_disconnect() when threads are waiting
2023-06-09 10:30:05 +02:00
ah4.c
xfrm: Use actual socket sk instead of skb socket for xfrm_output_resume
2021-04-14 08:42:05 +02:00
arp.c
ipv4: Invalidate neighbour for broadcast address upon address addition
2022-04-13 21:00:57 +02:00
bpf_tcp_ca.c
bpf: Change bpf_sk_storage_*() to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON
2020-09-25 13:58:01 -07:00
cipso_ipv4.c
cipso: Fix data-races around sysctl.
2022-07-21 21:20:08 +02:00
datagram.c
udp: Update reuse->has_conns under reuseport_lock.
2022-10-30 09:41:19 +01:00
devinet.c
net: socket: remove register_gifconf
2022-09-28 11:10:35 +02:00
esp4_offload.c
xfrm: replay: Fix ESN wrap around for GSO
2022-12-02 17:39:58 +01:00
esp4.c
esp: limit skb_page_frag_refill use to a single page
2022-04-27 13:53:48 +02:00
fib_frontend.c
ipv4: Fix incorrect table ID in IOCTL path
2023-03-22 13:30:00 +01:00
fib_lookup.h
…
fib_notifier.c
…
fib_rules.c
ipv4: convert fib_num_tclassid_users to atomic_t
2021-12-08 09:03:26 +01:00
fib_semantics.c
ipv4: prevent potential spectre v1 gadget in fib_metrics_match()
2023-02-01 08:23:25 +01:00
fib_trie.c
ipv4: Fix error return code in fib_table_insert()
2022-12-02 17:40:01 +01:00
fou.c
genetlink: move to smaller ops wherever possible
2020-10-02 19:11:11 -07:00
gre_demux.c
erspan: fix version 1 check in gre_parse_header()
2021-01-12 20:18:12 +01:00
gre_offload.c
net: gre: recompute gre csum for sctp over gre tunnels
2020-08-03 15:29:44 -07:00
icmp.c
icmp: guard against too small mtu
2023-04-20 12:10:21 +02:00
igmp.c
igmp: Fix data-races around sysctl_igmp_qrv.
2022-08-03 12:00:46 +02:00
inet_connection_sock.c
tcp: deny tcp_disconnect() when threads are waiting
2023-06-09 10:30:05 +02:00
inet_diag.c
inet_diag: fix kernel-infoleak for UDP sockets
2021-12-22 09:30:53 +01:00
inet_fragment.c
inet: frags: annotate races around fqdir->dead and fqdir->high_thresh
2022-01-27 10:54:33 +01:00
inet_hashtables.c
inet: fix fast path in __inet_hash_connect()
2023-03-11 16:39:50 +01:00
inet_timewait_sock.c
tcp: avoid the lookup process failing to get sk in ehash table
2023-02-01 08:23:15 +01:00
inetpeer.c
inetpeer: Fix data-races around sysctl.
2022-07-21 21:20:07 +02:00
ip_forward.c
ip: Fix data-races around sysctl_ip_fwd_update_priority.
2022-07-29 17:19:12 +02:00
ip_fragment.c
inet: frags: annotate races around fqdir->dead and fqdir->high_thresh
2022-01-27 10:54:33 +01:00
ip_gre.c
erspan: do not use skb_mac_header() in ndo_start_xmit()
2023-04-05 11:23:35 +02:00
ip_input.c
xfrm: fix "disable_policy" on ipv4 early demux
2022-12-02 17:39:58 +01:00
ip_options.c
net: clean up codestyle for net/ipv4
2020-08-25 06:28:02 -07:00
ip_output.c
net: Find dst with sk's xfrm policy not ctl_sk
2023-05-30 12:57:52 +01:00
ip_sockglue.c
ipv{4,6}/raw: fix output xfrm lookup wrt protocol
2023-06-05 09:07:04 +02:00
ip_tunnel_core.c
tunnels: do not assume mac header is set in skb_tunnel_check_pmtu()
2022-07-07 17:52:19 +02:00
ip_tunnel.c
net: tunnels: annotate lockless accesses to dev->needed_headroom
2023-03-22 13:29:58 +01:00
ip_vti.c
net: always use icmp{,v6}_ndo_send from ndo_start_xmit
2021-03-17 17:06:12 +01:00
ipcomp.c
ipcomp: assign if_id to child tunnel from parent tunnel
2020-07-09 12:55:37 +02:00
ipconfig.c
net: ipconfig: Don't override command-line hostnames or domains
2021-06-18 10:00:05 +02:00
ipip.c
net: ipip: implement header_ops->parse_protocol for AF_PACKET
2020-06-30 12:29:39 -07:00
ipmr_base.c
…
ipmr.c
ipmr,ip6mr: acquire RTNL before calling ip[6]mr_free_table() on failure path
2022-02-16 12:54:25 +01:00
Kconfig
tcp: configurable source port perturb table size
2022-12-02 17:40:05 +01:00
Makefile
udp_tunnel: add central NIC RX port offload infrastructure
2020-07-10 13:54:00 -07:00
metrics.c
ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()
2023-02-01 08:23:24 +01:00
netfilter.c
netfilter: use actual socket sk rather than skb sk when routing harder
2020-10-30 12:57:39 +01:00
netlink.c
…
nexthop.c
nh: fix scope used to find saddr when adding non gw nh
2022-11-03 23:57:54 +09:00
ping.c
lsm,selinux: pass flowi_common instead of flowi to the LSM hooks
2022-06-09 10:21:09 +02:00
proc.c
tcp: switch orphan_count to bare per-cpu counters
2021-11-18 14:04:08 +01:00
protocol.c
…
raw_diag.c
…
raw.c
ipv{4,6}/raw: fix output xfrm lookup wrt protocol
2023-06-05 09:07:04 +02:00
route.c
ip: Fix data-races around sysctl_ip_fwd_use_pmtu.
2022-07-29 17:19:12 +02:00
syncookies.c
mptcp: remove MPTCP 'ifdef' in TCP SYN cookies
2023-01-14 10:16:51 +01:00
sysctl_net_ipv4.c
tcp: restrict net.ipv4.tcp_app_win
2023-04-20 12:10:26 +02:00
tcp_bbr.c
tcp_bbr: fix u32 wrap bug in round logic if bbr_init() called after 2B packets
2021-08-18 08:59:13 +02:00
tcp_bic.c
…
tcp_bpf.c
net: deal with most data-races in sk_wait_event()
2023-05-30 12:57:46 +01:00
tcp_cdg.c
tcp: cdg: allow tcp_cdg_release() to be called multiple times
2022-11-25 17:45:55 +01:00
tcp_cong.c
net: Only allow init netns to set default tcp cong to a restricted algo
2021-05-14 09:50:46 +02:00
tcp_cubic.c
tcp_cubic: fix spurious Hystart ACK train detections for not-cwnd-limited flows
2021-12-01 09:19:06 +01:00
tcp_dctcp.c
…
tcp_dctcp.h
…
tcp_diag.c
…
tcp_fastopen.c
tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.
2022-07-29 17:19:18 +02:00
tcp_highspeed.c
Replace HTTP links with HTTPS ones: IPv*
2020-07-06 13:23:03 -07:00
tcp_htcp.c
Replace HTTP links with HTTPS ones: IPv*
2020-07-06 13:23:03 -07:00
tcp_hybla.c
…
tcp_illinois.c
…
tcp_input.c
tcp: add annotations around sk->sk_shutdown accesses
2023-05-30 12:57:46 +01:00
tcp_ipv4.c
tcp: fix possible sk_priority leak in tcp_v4_send_reset()
2023-05-30 12:57:52 +01:00
tcp_lp.c
…
tcp_metrics.c
tcp: Fix data-races around sysctl_tcp_no_ssthresh_metrics_save.
2022-08-03 12:00:45 +02:00
tcp_minisocks.c
tcp: tcp_check_req() can be called from process context
2023-03-11 16:40:13 +01:00
tcp_nv.c
…
tcp_offload.c
net, gro: Set inner transport header offset in tcp/udp GRO hook
2021-08-12 13:22:05 +02:00
tcp_output.c
tcp: tcp_make_synack() can be called from process context
2023-03-22 13:29:57 +01:00
tcp_rate.c
tcp: ensure to use the most recently sent skb when filling the rate sample
2022-05-09 09:05:03 +02:00
tcp_recovery.c
tcp: Fix data-races around sysctl_tcp_recovery.
2022-07-29 17:19:21 +02:00
tcp_scalable.c
net: ipv4: delete repeated words
2020-08-24 17:31:20 -07:00
tcp_timer.c
tcp: Fix a data-race around sysctl_tcp_thin_linear_timeouts.
2022-07-29 17:19:21 +02:00
tcp_ulp.c
net/ulp: use consistent error code when blocking ULP
2023-01-24 07:20:01 +01:00
tcp_vegas.c
tcp: use semicolons rather than commas to separate statements
2020-10-13 17:11:52 -07:00
tcp_vegas.h
…
tcp_veno.c
Replace HTTP links with HTTPS ones: IPv*
2020-07-06 13:23:03 -07:00
tcp_westwood.c
…
tcp_yeah.c
…
tcp.c
tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set
2023-06-09 10:30:06 +02:00
tunnel4.c
tunnel4: add cb_handler to struct xfrm_tunnel
2020-07-09 12:51:36 +02:00
udp_bpf.c
bpf, sockmap, udp: sk_prot needs inuse_idx set for proc stats
2021-07-28 14:35:37 +02:00
udp_diag.c
…
udp_impl.h
net: pass a sockptr_t into ->setsockopt
2020-07-24 15:41:54 -07:00
udp_offload.c
net, gro: Set inner transport header offset in tcp/udp GRO hook
2021-08-12 13:22:05 +02:00
udp_tunnel_core.c
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
2023-01-14 10:15:43 +01:00
udp_tunnel_nic.c
udp_tunnel: Fix end of loop test in udp_tunnel_nic_unregister()
2022-03-02 11:42:51 +01:00
udp_tunnel_stub.c
udp_tunnel: add central NIC RX port offload infrastructure
2020-07-10 13:54:00 -07:00
udp.c
tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().
2023-04-26 11:27:41 +02:00
udplite.c
udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().
2023-05-30 12:57:57 +01:00
xfrm4_input.c
…
xfrm4_output.c
xfrm: fix unused variable warning if CONFIG_NETFILTER=n
2020-05-11 15:12:27 +02:00
xfrm4_policy.c
…
xfrm4_protocol.c
net: xfrm: unexport __init-annotated xfrm4_protocol_init()
2022-06-14 18:32:40 +02:00
xfrm4_state.c
…
xfrm4_tunnel.c
xfrm: interface: fix the priorities for ipip and ipv6 tunnels
2020-10-09 12:29:48 +02:00