kernel/linux.git/net/ipv4/ip_input.c, branch v6.19.11

net: ipv4: Remove extern udp_v4_early_demux()/tcp_v4_early_demux() in .c files

2025-10-30T00:05:30+00:00

Function udp_v4_early_demux() was already declared in 'include/net/udp.h', no need to keep the extern in 'ip_input.c', which may produce the following checkpatch warning: WARNING: externs should be avoided in .c files #45: FILE: net/ipv4/ip_input.c:322: +enum skb_drop_reason udp_v4_early_demux(struct sk_buff *skb); Replace it by including 'net/udp.h'. Do the same for tcp_v4_early_demux(). Signed-off-by: Wang Liang Link: https://patch.msgid.link/20251025092637.1020960-1-wangliang74@huawei.com Signed-off-by: Jakub Kicinski

net: ipv4: convert ip_rcv_options to drop reasons

2025-09-20T00:35:52+00:00

This converts the only path not returning drop reasons in ip_rcv_finish_core. Signed-off-by: Antoine Tenart Reviewed-by: David Ahern Link: https://patch.msgid.link/20250915091958.15382-4-atenart@kernel.org Signed-off-by: Jakub Kicinski

net: ipv4: simplify drop reason handling in ip_rcv_finish_core

2025-09-20T00:35:51+00:00

Instead of setting the drop reason to SKB_DROP_REASON_NOT_SPECIFIED early and having to reset it each time it is overridden by a function returned value, just set the drop reason to the expected value before returning from ip_rcv_finish_core. Signed-off-by: Antoine Tenart Link: https://patch.msgid.link/20250915091958.15382-3-atenart@kernel.org Signed-off-by: Jakub Kicinski

net: ipv4: make udp_v4_early_demux explicitly return drop reason

2025-09-20T00:35:51+00:00

udp_v4_early_demux already returns drop reasons as it either returns 0 or ip_mc_validate_source, which itself returns drop reasons. Its return value is also already used as a drop reason itself. Makes this explicit by making it return drop reasons. Signed-off-by: Antoine Tenart Reviewed-by: David Ahern Link: https://patch.msgid.link/20250915091958.15382-2-atenart@kernel.org Signed-off-by: Jakub Kicinski

net: ipv4: allow directed broadcast routes to use dst hint

2025-08-25T23:07:16+00:00

Currently, ip_extract_route_hint uses RTN_BROADCAST to decide whether to use the route dst hint mechanism. This check is too strict, as it prevents directed broadcast routes from using the hint, resulting in poor performance during bursts of directed broadcast traffic. Fix this in ip_extract_route_hint and modify ip_route_use_hint to preserve the intended behaviour. Signed-off-by: Oscar Maes Reviewed-by: David Ahern Link: https://patch.msgid.link/20250819174642.5148-2-oscmaes92@gmail.com Signed-off-by: Jakub Kicinski

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

2025-07-04T06:03:18+00:00

Cross-merge networking fixes after downstream PR (net-6.16-rc5). No conflicts. No adjacent changes. Signed-off-by: Paolo Abeni

net: preserve MSG_ZEROCOPY with forwarding

2025-07-02T22:07:16+00:00

MSG_ZEROCOPY data must be copied before data is queued to local sockets, to avoid indefinite timeout until memory release. This test is performed by skb_orphan_frags_rx, which is called when looping an egress skb to packet sockets, error queue or ingress path. To preserve zerocopy for skbs that are looped to ingress but are then forwarded to an egress device rather than delivered locally, defer this last check until an skb enters the local IP receive path. This is analogous to existing behavior of skb_clear_delivery_time. Signed-off-by: Willem de Bruijn Link: https://patch.msgid.link/20250630194312.1571410-2-willemdebruijn.kernel@gmail.com Signed-off-by: Jakub Kicinski

net: ipv4: fix stat increase when udp early demux drops the packet

2025-07-02T21:46:44+00:00

udp_v4_early_demux now returns drop reasons as it either returns 0 or ip_mc_validate_source, which returns itself a drop reason. However its use was not converted in ip_rcv_finish_core and the drop reason is ignored, leading to potentially skipping increasing LINUX_MIB_IPRPFILTER if the drop reason is SKB_DROP_REASON_IP_RPFILTER. This is a fix and we're not converting udp_v4_early_demux to explicitly return a drop reason to ease backports; this can be done as a follow-up. Fixes: d46f827016d8 ("net: ip: make ip_mc_validate_source() return drop reason") Cc: Menglong Dong Reported-by: Sabrina Dubroca Signed-off-by: Antoine Tenart Reviewed-by: Sabrina Dubroca Link: https://patch.msgid.link/20250701074935.144134-1-atenart@kernel.org Signed-off-by: Jakub Kicinski

ipv4: remove useless arg

2025-01-03T01:17:40+00:00

The "struct sock *sk" parameter in ip_rcv_finish_core is unused, which leads the compiler to optimize it out. As a result, the "struct sk_buff *skb" parameter is passed using x1. And this make kprobe hard to use. Signed-off-by: Yu Tian Link: https://patch.msgid.link/20241231023610.1657926-1-tianyu2@kernelsoft.com Signed-off-by: Jakub Kicinski

net: ip: make ip_route_use_hint() return drop reasons

2024-11-12T10:24:51+00:00

In this commit, we make ip_route_use_hint() return drop reasons. The drop reasons that we return are similar to what we do in ip_route_input_slow(), and no drop reasons are added in this commit. Signed-off-by: Menglong Dong Signed-off-by: Paolo Abeni