kernel/linux.git/net/ipv6/af_inet6.c, branch linux-7.1.y

tcp: update window_clamp when SO_RCVBUF is set

2026-04-13T13:32:35+00:00

Commit under Fixes moved recomputing the window clamp to tcp_measure_rcv_mss() (when scaling_ratio changes). I suspect it missed the fact that we don't recompute the clamp when rcvbuf is set. Until scaling_ratio changes we are stuck with the old window clamp which may be based on the small initial buffer. scaling_ratio may never change. Inspired by Eric's recent commit d1361840f8c5 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning") plumb the user action thru to TCP and have it update the clamp. A smaller fix would be to just have tcp_rcvbuf_grow() adjust the clamp even if SOCK_RCVBUF_LOCK is set. But IIUC this is what we were trying to get away from in the first place. Fixes: a2cbb1603943 ("tcp: Update window clamping condition") Signed-off-by: Jakub Kicinski Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20260408001438.129165-1-kuba@kernel.org Signed-off-by: Paolo Abeni

netfilter: remove nf_ipv6_ops and use direct function calls

2026-03-29T18:21:24+00:00

As IPv6 is built-in only, nf_ipv6_ops can be removed completely as it is not longer necessary. Convert all nf_ipv6_ops usage to direct function calls instead. In addition, remove the ipv6_netfilter_init/fini() functions as they are not necessary any longer. Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260325120928.15848-12-fmancera@suse.de Signed-off-by: Jakub Kicinski

ipv6: remove ipv6_stub infrastructure completely

2026-03-29T18:21:24+00:00

As IPv6 is built-in only and there are no more users of ipv6_stub, the ipv6_stub is now entirely obsolete. Remove all the code related to the definition, initialization and usage. Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Link: https://patch.msgid.link/20260325120928.15848-11-fmancera@suse.de Signed-off-by: Jakub Kicinski

bpf: remove ipv6_bpf_stub completely and use direct function calls

2026-03-29T18:21:24+00:00

As IPv6 is built-in only, the ipv6_bpf_stub can be removed completely. Convert all ipv6_bpf_stub usage to direct function calls instead. The fallback functions introduced previously will prevent linkage errors when CONFIG_IPV6 is disabled. Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Acked-by: Daniel Borkmann Reviewed-by: Martin KaFai Lau Link: https://patch.msgid.link/20260325120928.15848-10-fmancera@suse.de Signed-off-by: Jakub Kicinski

ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs

2026-03-29T18:21:22+00:00

Maintaining a modular IPv6 stack offers image size savings for specific setups, this benefit is outweighed by the architectural burden it imposes on the subsystems on implementation and maintenance. Therefore, drop it. Change CONFIG_IPV6 from tristate to bool. Remove all Kconfig dependencies across the tree that explicitly checked for IPV6=m. In addition, remove MODULE_DESCRIPTION(), MODULE_ALIAS(), MODULE_AUTHOR() and MODULE_LICENSE(). This is also replacing module_init() by device_initcall(). It is not possible to use fs_initcall() as IPv4 does because that creates a race condition on IPv6 addrconf. Finally, modify the default configs from CONFIG_IPV6=m to CONFIG_IPV6=y except for m68k as according to the bloat-o-meter the image is increasing by 330KB~ and that isn't acceptable. Instead, disable IPv6 on this architecture by default. This is aligned with m68k RAM requirements and recommendations [1]. [1] http://www.linux-m68k.org/faq/ram.html Signed-off-by: Fernando Fernandez Mancera Tested-by: Ricardo B. Marlière Acked-by: Krzysztof Kozlowski # arm64 Link: https://patch.msgid.link/20260325120928.15848-2-fmancera@suse.de Signed-off-by: Jakub Kicinski

udp: Remove UDP-Lite SNMP stats.

2026-03-14T01:57:44+00:00

Since UDP and UDP-Lite shared most of the code, we have had to check the protocol every time we increment SNMP stats. Now that the UDP-Lite paths are dead, let's remove UDP-Lite SNMP stats. Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-6-kuniyu@google.com Signed-off-by: Jakub Kicinski

ipv6: Retire UDP-Lite.

2026-03-14T01:57:44+00:00

As announced in commit be28c14ac8bb ("udplite: Print deprecation notice."), it's time to deprecate UDP-Lite. As a first step, let's drop support for IPv6 UDP-Lite sockets. We will remove the remaining dead code gradually. Along with the removal of udplite.c, most of the functions exposed via udp_impl.h are made static. The prototypes of udpv6_sendmsg() and udpv6_recvmsg() are moved to udp.h, but only udpv6_recvmsg() has INDIRECT_CALLABLE_DECLARE() because udpv6_sendmsg() is exported for rxrpc since commit ed472b0c8783 ("rxrpc: Call udp_sendmsg() directly"). Also, udpv6_recvmsg() needs INDIRECT_CALLABLE_SCOPE for CONFIG_MITIGATION_RETPOLINE=n. Note that udplite.h is included temporarily for udplite_csum(). Signed-off-by: Kuniyuki Iwashima Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260311052020.1213705-3-kuniyu@google.com Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-03-12T19:53:34+00:00

Cross-merge networking fixes after downstream PR (net-7.0-rc4). drivers/net/ethernet/mellanox/mlx5/core/en_rx.c db25c42c2e1f9 ("net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ") dff1c3164a692 ("net/mlx5e: SHAMPO, Always calculate page size") https://lore.kernel.org/aa7ORohmf67EKihj@sirena.org.uk drivers/net/ethernet/ti/am65-cpsw-nuss.c 840c9d13cb1ca ("net: ethernet: ti: am65-cpsw-nuss: Fix rx_filter value for PTP support") a23c657e332f2 ("net: ethernet: ti: am65-cpsw: Use also port number to identify timestamps") https://lore.kernel.org/abK3EkIXuVgMyGI7@sirena.org.uk No adjacent changes. Signed-off-by: Jakub Kicinski

ipv6: move the disable_ipv6_mod knob to core code

2026-03-12T00:53:37+00:00

From: Jakub Kicinski Make sure disable_ipv6_mod itself is not part of the IPv6 module, in case core code wants to refer to it. We will remove support for IPv6=m soon, this change helps make fixes we commit before that less messy. Link: https://patch.msgid.link/20260307-net-nd_tbl_fixes-v4-1-e2677e85628c@suse.com Signed-off-by: Jakub Kicinski

net: remove addr_len argument of recvmsg() handlers

2026-03-03T02:17:17+00:00

Use msg->msg_namelen as a place holder instead of a temporary variable, notably in inet[6]_recvmsg(). This removes stack canaries and allows tail-calls. $ scripts/bloat-o-meter -t vmlinux.old vmlinux add/remove: 0/0 grow/shrink: 2/19 up/down: 26/-532 (-506) Function old new delta rawv6_recvmsg 744 767 +23 vsock_dgram_recvmsg 55 58 +3 vsock_connectible_recvmsg 50 47 -3 unix_stream_recvmsg 161 158 -3 unix_seqpacket_recvmsg 62 59 -3 unix_dgram_recvmsg 42 39 -3 tcp_recvmsg 546 543 -3 mptcp_recvmsg 1568 1565 -3 ping_recvmsg 806 800 -6 tcp_bpf_recvmsg_parser 983 974 -9 ip_recv_error 588 576 -12 ipv6_recv_rxpmtu 442 428 -14 udp_recvmsg 1243 1224 -19 ipv6_recv_error 1046 1024 -22 udpv6_recvmsg 1487 1461 -26 raw_recvmsg 465 437 -28 udp_bpf_recvmsg 1027 984 -43 sock_common_recvmsg 103 27 -76 inet_recvmsg 257 175 -82 inet6_recvmsg 257 175 -82 tcp_bpf_recvmsg 663 568 -95 Total: Before=25143834, After=25143328, chg -0.00% Signed-off-by: Eric Dumazet Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260227151120.1346573-1-edumazet@google.com Signed-off-by: Jakub Kicinski