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linux/net/ipv4
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Philo Lu 644f9108f3 udp: Make rehash4 independent in udp_lib_rehash() 
As discussed in [0], rehash4 could be missed in udp_lib_rehash() when
udp hash4 changes while hash2 doesn't change. This patch fixes this by
moving rehash4 codes out of rehash2 checking, and then rehash2 and
rehash4 are done separately.

By doing this, we no longer need to call rehash4 explicitly in
udp_lib_hash4(), as the rehash callback in __ip4_datagram_connect takes
it. Thus, now udp_lib_hash4() returns directly if the sk is already
hashed.

Note that uhash4 may fail to work under consecutive connect(<dst
address>) calls because rehash() is not called with every connect(). To
overcome this, connect(<AF_UNSPEC>) needs to be called after the next
connect to a new destination.

[0]
https://lore.kernel.org/all/4761e466ab9f7542c68cdc95f248987d127044d2.1733499715.git.pabeni@redhat.com/

Fixes: 78c91ae2c6 ("ipv4/udp: Add 4-tuple hash for connected socket")
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Philo Lu <lulie@linux.alibaba.com>
Link: https://patch.msgid.link/20250110010810.107145-1-lulie@linux.alibaba.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2025-01-14 10:44:10 +01:00
..
netfilter netfilter: nf_dup4: Convert nf_dup_ipv4_route() to dscp_t. 2024-11-15 11:00:29 +01:00
af_inet.c net: inet: do not leave a dangling sk pointer in inet_create() 2024-10-15 18:43:08 -07:00
ah4.c
arp.c neighbour: Remove bare neighbour::next pointer 2024-11-09 13:22:57 -08:00
bpf_tcp_ca.c bpf: Check unsupported ops from the bpf_struct_ops's cfi_stubs 2024-07-29 12:54:13 -07:00
cipso_ipv4.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
datagram.c udp: fix l4 hash after reconnect 2024-12-10 15:30:36 +01:00
devinet.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
esp4.c net: support non paged skb frags 2024-09-11 20:44:31 -07:00
esp4_offload.c xfrm: Add an inbound percpu state cache. 2024-10-29 11:56:18 +01:00
fib_frontend.c net: ip: fix unexpected return in fib_validate_source() 2024-11-18 18:57:00 -08:00
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: use READ_ONCE()/WRITE_ONCE() on net->ipv4.fib_seq 2024-10-11 15:35:05 -07:00
fib_semantics.c ipv4: remove fib_info_devhash[] 2024-10-07 16:46:27 -07:00
fib_trie.c ipv4: replace call_rcu by kfree_rcu for simple kmem_cache_free callback 2024-10-15 10:50:21 -07:00
fou_bpf.c
fou_core.c fou: fix initialization of grc 2024-09-09 17:21:47 -07:00
fou_nl.c tools: ynl-gen: use big-endian netlink attribute types 2024-10-22 15:33:24 +02:00
fou_nl.h
gre_demux.c
gre_offload.c
icmp.c net: Fix icmp host relookup triggering ip_rt_bug 2024-11-30 14:17:10 -08:00
igmp.c net: ipv4: igmp: optimize ____ip_mc_inc_group() using mc_hash 2024-10-09 12:50:11 +01:00
inet_connection_sock.c tcp: Fix use-after-free of nreq in reqsk_timer_handler(). 2024-11-28 09:48:00 +01:00
inet_diag.c tcp: annotate data-races around icsk->icsk_pending 2024-10-04 15:34:39 -07:00
inet_fragment.c net: Rename mono_delivery_time to tstamp_type for scalabilty 2024-05-23 14:14:23 -07:00
inet_hashtables.c inet: constify 'struct net' parameter of various lookup helpers 2024-08-05 16:22:45 -07:00
inet_timewait_sock.c tcp: move inet_twsk_schedule helper out of header 2024-06-10 11:54:18 +01:00
inetpeer.c inetpeer: replace call_rcu by kfree_rcu for simple kmem_cache_free callback 2024-10-15 10:50:21 -07:00
ip_forward.c
ip_fragment.c net: ip: make ip_route_input_noref() return drop reasons 2024-11-12 11:24:51 +01:00
ip_gre.c ipv4: ip_gre: Fix drops of small packets in ipgre_xmit 2024-10-01 13:04:03 +02:00
ip_input.c net: ip: make ip_route_use_hint() return drop reasons 2024-11-12 11:24:51 +01:00
ip_options.c net: ip: make ip_route_input() return drop reasons 2024-11-12 11:24:51 +01:00
ip_output.c ipv4: tcp: give socket pointer to control skbs 2024-10-14 17:39:37 -07:00
ip_sockglue.c
ip_tunnel.c net: Fix netns for ip_tunnel_init_flow() 2024-12-23 10:04:41 -08:00
ip_tunnel_core.c
ip_vti.c netdev_features: convert NETIF_F_LLTX to dev->lltx 2024-09-03 11:36:43 +02:00
ipcomp.c
ipconfig.c
ipip.c netdev_features: convert NETIF_F_LLTX to dev->lltx 2024-09-03 11:36:43 +02:00
ipmr.c ipmr: tune the ipmr_can_free_table() checks. 2024-12-04 18:49:16 -08:00
ipmr_base.c ipmr: Fix access to mfc_cache_list without lock held 2024-11-13 19:09:42 -08:00
Kconfig net/tcp: Expand goo.gl link 2024-07-30 18:35:12 -07:00
Makefile
metrics.c net: remove NULL-pointer net parameter in ip_metrics_convert 2024-06-05 10:06:00 +01:00
netfilter.c netfilter: ipv4: Convert ip_route_me_harder() to dscp_t. 2024-11-15 11:00:29 +01:00
netlink.c
nexthop.c net: convert to nla_get_*_default() 2024-11-11 10:32:06 -08:00
ping.c ping: use sk_skb_reason_drop to free rx packets 2024-06-19 12:44:22 +01:00
proc.c minmax: add a few more MIN_T/MAX_T users 2024-07-28 13:41:14 -07:00
protocol.c
raw.c net_tstamp: add SCM_TS_OPT_ID for RAW sockets 2024-10-04 11:52:19 -07:00
raw_diag.c
route.c ipv4: route: fix drop reason being overridden in ip_route_input_slow 2025-01-09 18:03:24 -08:00
syncookies.c tcp: use sk_skb_reason_drop to free rx packets 2024-06-19 12:44:22 +01:00
sysctl_net_ipv4.c icmp: icmp_msgs_per_sec and icmp_msgs_burst sysctls become per netns 2024-08-30 11:14:06 -07:00
tcp.c tcp: only release congestion control if it has been initialized 2024-10-31 18:22:48 -07:00
tcp_ao.c net/tcp: Add missing lockdep annotations for TCP-AO hlist traversals 2024-11-03 12:10:11 -08:00
tcp_bbr.c
tcp_bic.c
tcp_bpf.c tcp_bpf: Fix copied value in tcp_bpf_sendmsg 2024-12-20 22:53:36 +01:00
tcp_cdg.c
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_dctcp.c tcp: Fix shift-out-of-bounds in dctcp_update_alpha(). 2024-05-21 13:34:50 +02:00
tcp_dctcp.h
tcp_diag.c
tcp_fastopen.c net: use unrcu_pointer() helper 2024-06-06 11:52:52 +02:00
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 net: fix memory leak in tcp_conn_request() 2024-12-23 10:03:12 -08:00
tcp_ipv4.c tcp: Annotate data-race around sk->sk_mark in tcp_v4_send_reset 2025-01-08 10:22:02 -08:00
tcp_lp.c
tcp_metrics.c tcp_metrics: use netlink policy for IPv6 addr len validation 2024-08-19 17:42:57 -07:00
tcp_minisocks.c tcp: populate XPS related fields of timewait sockets 2024-11-30 13:00:52 -08:00
tcp_nv.c
tcp_offload.c net: gso: fix tcp fraglist segmentation after pull from frag_list 2024-10-02 17:21:47 -07:00
tcp_output.c tcp: check space before adding MPTCP SYN options 2024-12-10 18:26:52 -08:00
tcp_plb.c
tcp_rate.c
tcp_recovery.c
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 net: tcp: refresh tcp_mstamp for compressed ack in timer 2024-10-07 16:01:39 -07:00
tcp_ulp.c
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tunnel4.c
udp.c udp: Make rehash4 independent in udp_lib_rehash() 2025-01-14 10:44:10 +01:00
udp_bpf.c
udp_diag.c
udp_impl.h
udp_offload.c gso: fix udp gso fraglist segmentation after pull from frag_list 2024-10-02 17:29:31 -07:00
udp_tunnel_core.c ipv4: udp_tunnel: Unmask upper DSCP bits in udp_tunnel_dst_lookup() 2024-09-09 14:14:53 +01:00
udp_tunnel_nic.c
udp_tunnel_stub.c
udplite.c
xfrm4_input.c ipv4: Convert ip_route_input_noref() to dscp_t. 2024-10-03 16:21:21 -07:00
xfrm4_output.c
xfrm4_policy.c xfrm: Convert struct xfrm_dst_lookup_params -> tos to dscp_t. 2024-11-06 12:42:51 +01:00
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