kernel/linux.git/include/net/dropreason.h, branch v6.19.11

wifi: mac80211: Drop cooked monitor support

2025-02-11T10:58:17+00:00

Hostapd switched from cooked monitor interfaces to nl80211 Dec 2011. Drop support for the outdated cooked monitor interfaces and fix creating the virtual monitor interfaces in the following cases: 1) We have one non-monitor and one monitor interface with %MONITOR_FLAG_ACTIVE enabled and then delete the non-monitor interface. 2) We only have monitor interfaces enabled on resume while at least one has %MONITOR_FLAG_ACTIVE set. Signed-off-by: Alexander Wetzel Link: https://patch.msgid.link/20250204111352.7004-2-Alexander@wetzel-home.de Signed-off-by: Johannes Berg

net: openvswitch: add last-action drop reason

2023-08-14T07:01:06+00:00

Create a new drop reason subsystem for openvswitch and add the first drop reason to represent last-action drops. Last-action drops happen when a flow has an empty action list or there is no action that consumes the packet (output, userspace, recirc, etc). It is the most common way in which OVS drops packets. Implementation-wise, most of these skb-consuming actions already call "consume_skb" internally and return directly from within the do_execute_actions() loop so with minimal changes we can assume that any skb that exits the loop normally is a packet drop. Signed-off-by: Adrian Moreno Signed-off-by: David S. Miller

mac80211: use the new drop reasons infrastructure

2023-04-21T03:20:49+00:00

It can be really hard to analyse or debug why packets are going missing in mac80211, so add the needed infrastructure to use use the new per-subsystem drop reasons. We actually use two drop reason subsystems here because of the different handling of frames that are dropped but still go to monitor for old versions of hostapd, and those that are just completely unusable (e.g. crypto failed.) Annotate a few reasons here just to illustrate this, we'll need to go through and annotate more of them later. Signed-off-by: Johannes Berg Signed-off-by: Jakub Kicinski

net: extend drop reasons for multiple subsystems

2023-04-21T03:20:49+00:00

Extend drop reasons to make them usable by subsystems other than core by reserving the high 16 bits for a new subsystem ID, of which 0 of course is used for the existing reasons immediately. To still be able to have string reasons, restructure that code a bit to make the loopup under RCU, the only user of this (right now) is drop_monitor. Link: https://lore.kernel.org/netdev/00659771ed54353f92027702c5bbb84702da62ce.camel@sipsolutions.net Signed-off-by: Johannes Berg Signed-off-by: Jakub Kicinski

net: move dropreason.h to dropreason-core.h

2023-04-21T03:20:49+00:00

This will, after the next patch, hold only the core drop reasons and minimal infrastructure. Fix a small kernel-doc issue while at it, to avoid the move triggering a checker. Signed-off-by: Johannes Berg Signed-off-by: Jakub Kicinski

ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_NS_OTHERHOST

2023-02-20T08:54:23+00:00

Hosts can often receive neighbour discovery messages that are not for them. Use a dedicated drop reason to make clear the packet is dropped for this normal case. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ipv6: icmp6: add SKB_DROP_REASON_IPV6_NDISC_BAD_OPTIONS

2023-02-20T08:54:23+00:00

This is a generic drop reason for any error detected in ndisc_parse_options(). Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

ipv6: icmp6: add drop reason support to ndisc_rcv()

2023-02-14T03:55:32+00:00

Creates three new drop reasons: SKB_DROP_REASON_IPV6_NDISC_FRAG: invalid frag (suppress_frag_ndisc). SKB_DROP_REASON_IPV6_NDISC_HOP_LIMIT: invalid hop limit. SKB_DROP_REASON_IPV6_NDISC_BAD_CODE: invalid NDISC icmp6 code. Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Signed-off-by: Jakub Kicinski

net: dropreason: add SKB_DROP_REASON_IPV6_BAD_EXTHDR

2023-02-14T03:55:32+00:00

This drop reason can be used whenever an IPv6 packet has a malformed extension header. Signed-off-by: Eric Dumazet Reviewed-by: David Ahern Signed-off-by: Jakub Kicinski

tcp: add TCP_MINTTL drop reason

2023-02-03T05:14:50+00:00

In the unlikely case incoming packets are dropped because of IP_MINTTL / IPV6_MINHOPCOUNT constraints... Signed-off-by: Eric Dumazet Link: https://lore.kernel.org/r/20230201174345.2708943-1-edumazet@google.com Signed-off-by: Jakub Kicinski