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linux/net/ipv4
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Cambda Zhu 34dfde4ad8 tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set 
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>
2023-05-29 22:03:48 -07:00
..
bpfilter
…
netfilter
xtables: move icmp/icmpv6 logic to xt_tcpudp
2023-03-22 21:48:59 +01:00
af_inet.c
tcp: deny tcp_disconnect() when threads are waiting
2023-05-29 22:03:48 -07:00
ah4.c
net: ipv4: Remove completion function scaffolding
2023-02-13 18:35:15 +08:00
arp.c
neighbour: annotate lockless accesses to n->nud_state
2023-03-15 00:37:32 -07:00
bpf_tcp_ca.c
bpf: Remove unused arguments from btf_struct_access().
2023-04-04 16:57:10 -07:00
cipso_ipv4.c
cipso_ipv4: use iph_set_totlen in skbuff_setattr
2023-02-01 20:54:27 -08:00
datagram.c
Networking fixes for 6.1-rc2, including fixes from netfilter
2022-10-20 17:24:59 -07:00
devinet.c
net: ipv4: Allow changing IPv4 address protocol
2023-03-23 08:32:52 +00:00
esp4_offload.c
xfrm: replay: Fix ESN wrap around for GSO
2022-10-19 09:00:53 +02:00
esp4.c
net: ipv4: Remove completion function scaffolding
2023-02-13 18:35:15 +08:00
fib_frontend.c
ipv4: Fix incorrect table ID in IOCTL path
2023-03-16 17:26:31 -07:00
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
neighbour: switch to standard rcu, instead of rcu_bh
2023-03-21 21:32:18 -07:00
fib_trie.c
ipv4: Fix error return code in fib_table_insert()
2022-11-22 20:18:20 -08:00
fou_bpf.c
bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs
2023-04-12 16:40:39 -07:00
fou_core.c
bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs
2023-04-12 16:40:39 -07:00
fou_nl.c
ynl: broaden the license even more
2023-03-16 21:20:32 -07:00
fou_nl.h
ynl: broaden the license even more
2023-03-16 21:20:32 -07:00
gre_demux.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
gre_offload.c
net: gro: skb_gro_header helper function
2022-08-25 10:33:21 +02:00
icmp.c
icmp: guard against too small mtu
2023-03-31 21:37:06 -07:00
igmp.c
ipv4: constify ip_mc_sf_allow() socket argument
2023-03-17 08:56:37 +00:00
inet_connection_sock.c
tcp: deny tcp_disconnect() when threads are waiting
2023-05-29 22:03:48 -07:00
inet_diag.c
net: inet: Retire port only listening_hash
2022-05-12 16:52:18 -07:00
inet_fragment.c
net: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT
2022-10-31 20:14:27 -07:00
inet_hashtables.c
ipv6: Remove in6addr_any alternatives.
2023-03-29 08:22:52 +01:00
inet_timewait_sock.c
net: no longer support SOCK_REFCNT_DEBUG feature
2023-02-15 10:25:21 +00:00
inetpeer.c
inetpeer: Fix data-races around sysctl.
2022-07-08 12:10:33 +01:00
ip_forward.c
ip: Fix data-races around sysctl_ip_fwd_update_priority.
2022-07-15 11:49:55 +01:00
ip_fragment.c
net: dropreason: add SKB_DROP_REASON_FRAG_TOO_FAR
2022-10-31 20:14:27 -07:00
ip_gre.c
erspan: do not use skb_mac_header() in ndo_start_xmit()
2023-03-21 21:16:26 -07:00
ip_input.c
net: add support for ipv4 big tcp
2023-02-01 20:54:27 -08:00
ip_options.c
ipv4: drop fragmentation code from ip_options_build()
2022-01-29 17:53:07 +00:00
ip_output.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2023-04-26 10:17:46 +02:00
ip_sockglue.c
ipv{4,6}/raw: fix output xfrm lookup wrt protocol
2023-05-23 15:38:59 +02:00
ip_tunnel_core.c
net: Add helper function to parse netlink msg of ip_tunnel_parm
2022-10-03 07:59:06 +01:00
ip_tunnel.c
bpf-next-for-netdev
2023-04-13 16:43:38 -07:00
ip_vti.c
ipv4: tunnels: use DEV_STATS_INC()
2022-11-16 12:48:44 +00:00
ipcomp.c
xfrm: ipcomp: add extack to ipcomp{4,6}_init_state
2022-09-29 07:18:00 +02:00
ipconfig.c
Driver core / kernfs changes for 6.0-rc1
2022-08-04 11:31:20 -07:00
ipip.c
ipip,ip_tunnel,sit: Add FOU support for externally controlled ipip devices
2023-04-12 16:40:39 -07:00
ipmr_base.c
ipmr: adopt rcu_read_lock() in mr_dump()
2022-06-24 11:34:38 +01:00
ipmr.c
treewide: Convert del_timer*() to timer_shutdown*()
2022-12-25 13:38:09 -08:00
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
ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()
2023-01-23 21:37:25 -08:00
netfilter.c
netfilter: Use l3mdev flow key when re-routing mangled packets
2022-05-16 13:03:29 +02:00
netlink.c
…
nexthop.c
neighbour: switch to standard rcu, instead of rcu_bh
2023-03-21 21:32:18 -07:00
ping.c
ping: Fix potentail NULL deref for /proc/net/icmp.
2023-04-04 18:56:58 -07:00
proc.c
icmp: Add counters for rate limits
2023-01-26 10:52:18 +01:00
protocol.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
raw_diag.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2023-04-06 12:01:20 -07:00
raw.c
ipv{4,6}/raw: fix output xfrm lookup wrt protocol
2023-05-23 15:38:59 +02:00
route.c
net: dst: fix missing initialization of rt_uncached
2023-04-21 20:26:56 -07:00
syncookies.c
mptcp: remove MPTCP 'ifdef' in TCP SYN cookies
2022-12-12 13:11:24 -08:00
sysctl_net_ipv4.c
tcp: restrict net.ipv4.tcp_app_win
2023-04-07 08:19:11 +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
bpf, sockmap: Incorrectly handling copied_seq
2023-05-23 16:10:42 +02:00
tcp_cdg.c
Random number generator fixes for Linux 6.1-rc1.
2022-10-16 15:27:07 -07:00
tcp_cong.c
net: Update an existing TCP congestion control algorithm.
2023-03-22 22:53:00 -07:00
tcp_cubic.c
bpf: Add __bpf_kfunc tag to all kfuncs
2023-02-02 00:25:14 +01:00
tcp_dctcp.c
bpf: Add __bpf_kfunc tag to all kfuncs
2023-02-02 00:25:14 +01:00
tcp_dctcp.h
…
tcp_diag.c
tcp: Access &tcp_hashinfo via net.
2022-09-20 10:21:49 -07:00
tcp_fastopen.c
tcp: Make SYN ACK RTO tunable by BPF programs with TFO
2022-08-17 10:19:22 +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
tcp: add annotations around sk->sk_shutdown accesses
2023-05-10 10:27:31 +01:00
tcp_ipv4.c
tcp: fix possible sk_priority leak in tcp_v4_send_reset()
2023-05-12 10:05:50 +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
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
tcp_minisocks.c
tcp: preserve const qualifier in tcp_sk()
2023-03-18 12:23:34 +00:00
tcp_nv.c
tcp: add accessors to read/set tp->snd_cwnd
2022-04-06 12:05:41 -07:00
tcp_offload.c
gro: add support of (hw)gro packets to gro stack
2022-10-03 12:38:34 +01:00
tcp_output.c
tcp: preserve const qualifier in tcp_sk()
2023-03-18 12:23:34 +00:00
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: preserve const qualifier in tcp_sk()
2023-03-18 12:23:34 +00:00
tcp_scalable.c
tcp: add accessors to read/set tp->snd_cwnd
2022-04-06 12:05:41 -07:00
tcp_timer.c
tcp: annotate lockless access to sk->sk_err
2023-03-17 08:25:05 +00:00
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
…
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
tcp.c
tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set
2023-05-29 22:03:48 -07:00
tunnel4.c
net: Remove the member netns_ok
2021-05-17 15:29:35 -07:00
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
net: remove noblock parameter from recvmsg() entities
2022-04-12 15:00:25 +02:00
udp_offload.c
udp: allow header check for dodgy GSO_UDP_L4 packets.
2022-12-12 09:29:56 +00:00
udp_tunnel_core.c
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
2022-12-12 09:51:52 +00:00
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.c
bpf, sockmap: Pass skb ownership through read_skb
2023-05-23 16:09:47 +02:00
udplite.c
udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated().
2023-05-25 10:51:58 +02:00
xfrm4_input.c
…
xfrm4_output.c
…
xfrm4_policy.c
net: dst: fix missing initialization of rt_uncached
2023-04-21 20:26:56 -07:00
xfrm4_protocol.c
net: xfrm: unexport __init-annotated xfrm4_protocol_init()
2022-06-08 10:10:13 -07:00
xfrm4_state.c
…
xfrm4_tunnel.c
xfrm: tunnel: add extack to ipip_init_state, xfrm6_tunnel_init_state
2022-09-29 07:18:00 +02:00