kernel/linux.git/include/net/protocol.h, branch v6.6.132

tcp/udp: Make early_demux back namespacified.

2022-07-16T01:50:35+00:00

Commit e21145a9871a ("ipv4: namespacify ip_early_demux sysctl knob") made it possible to enable/disable early_demux on a per-netns basis. Then, we introduced two knobs, tcp_early_demux and udp_early_demux, to switch it for TCP/UDP in commit dddb64bcb346 ("net: Add sysctl to toggle early demux for tcp and udp"). However, the .proc_handler() was wrong and actually disabled us from changing the behaviour in each netns. We can execute early_demux if net.ipv4.ip_early_demux is on and each proto .early_demux() handler is not NULL. When we toggle (tcp|udp)_early_demux, the change itself is saved in each netns variable, but the .early_demux() handler is a global variable, so the handler is switched based on the init_net's sysctl variable. Thus, netns (tcp|udp)_early_demux knobs have nothing to do with the logic. Whether we CAN execute proto .early_demux() is always decided by init_net's sysctl knob, and whether we DO it or not is by each netns ip_early_demux knob. This patch namespacifies (tcp|udp)_early_demux again. For now, the users of the .early_demux() handler are TCP and UDP only, and they are called directly to avoid retpoline. So, we can remove the .early_demux() handler from inet6?_protos and need not dereference them in ip6?_rcv_finish_core(). If another proto needs .early_demux(), we can restore it at that time. Fixes: dddb64bcb346 ("net: Add sysctl to toggle early demux for tcp and udp") Signed-off-by: Kuniyuki Iwashima Link: https://lore.kernel.org/r/20220713175207.7727-1-kuniyu@amazon.com Signed-off-by: Jakub Kicinski

net: Remove the member netns_ok

2021-05-17T22:29:35+00:00

Every protocol has the 'netns_ok' member and it is euqal to 1. The 'if (!prot->netns_ok)' always false in inet_add_protocol(). Signed-off-by: Yejune Deng Signed-off-by: David S. Miller

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman

net: Convert protocol error handlers from void to int

2018-11-09T01:13:08+00:00

We'll need this to handle ICMP errors for tunnels without a sending socket (i.e. FoU and GUE). There, we might have to look up different types of IP tunnels, registered as network protocols, before we get a match, so we want this for the error handlers of IPPROTO_IPIP and IPPROTO_IPV6 in both inet_protos and inet6_protos. These error codes will be used in the next patch. For consistency, return sensible error codes in protocol error handlers whenever handlers can't handle errors because, even if valid, they don't match a protocol or any of its states. This has no effect on existing error handling paths. Signed-off-by: Stefano Brivio Reviewed-by: Sabrina Dubroca Signed-off-by: David S. Miller

IPv4: early demux can return an error code

2017-10-01T02:55:47+00:00

Currently no error is emitted, but this infrastructure will used by the next patch to allow source address validation for mcast sockets. Since early demux can do a route lookup and an ipv4 route lookup can return an error code this is consistent with the current ipv4 route infrastructure. Signed-off-by: Paolo Abeni Signed-off-by: David S. Miller

net: Add sysctl to toggle early demux for tcp and udp

2017-03-24T20:17:07+00:00

Certain system process significant unconnected UDP workload. It would be preferrable to disable UDP early demux for those systems and enable it for TCP only. By disabling UDP demux, we see these slight gains on an ARM64 system- 782 -> 788Mbps unconnected single stream UDPv4 633 -> 654Mbps unconnected UDPv4 different sources The performance impact can change based on CPU architecure and cache sizes. There will not much difference seen if entire UDP hash table is in cache. Both sysctls are enabled by default to preserve existing behavior. v1->v2: Change function pointer instead of adding conditional as suggested by Stephen. v2->v3: Read once in callers to avoid issues due to compiler optimizations. Also update commit message with the tests. v3->v4: Store and use read once result instead of querying pointer again incorrectly. v4->v5: Refactor to avoid errors due to compilation with IPV6={m,n} Signed-off-by: Subash Abhinov Kasiviswanathan Suggested-by: Eric Dumazet Cc: Stephen Hemminger Cc: Tom Herbert Cc: David Miller Signed-off-by: David S. Miller

udp: Remove udp_offloads

2016-04-07T20:53:30+00:00

Now that the UDP encapsulation GRO functions have been moved to the UDP socket we not longer need the udp_offload insfrastructure so removing it. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller

udp: restrict offloads to one namespace

2016-01-10T22:28:24+00:00

udp tunnel offloads tend to aggregate datagrams based on inner headers. gro engine gets notified by tunnel implementations about possible offloads. The match is solely based on the port number. Imagine a tunnel bound to port 53, the offloading will look into all DNS packets and tries to aggregate them based on the inner data found within. This could lead to data corruption and malformed DNS packets. While this patch minimizes the problem and helps an administrator to find the issue by querying ip tunnel/fou, a better way would be to match on the specific destination ip address so if a user space socket is bound to the same address it will conflict. Cc: Tom Herbert Cc: Eric Dumazet Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller

net: Eliminate no_check from protosw

2014-05-23T20:28:53+00:00

It doesn't seem like an protocols are setting anything other than the default, and allowing to arbitrarily disable checksums for a whole protocol seems dangerous. This can be done on a per socket basis. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller

net: Add GRO support for UDP encapsulating protocols

2014-01-22T02:05:04+00:00

Add GRO handlers for protocols that do UDP encapsulation, with the intent of being able to coalesce packets which encapsulate packets belonging to the same TCP session. For GRO purposes, the destination UDP port takes the role of the ether type field in the ethernet header or the next protocol in the IP header. The UDP GRO handler will only attempt to coalesce packets whose destination port is registered to have gro handler. Use a mark on the skb GRO CB data to disallow (flush) running the udp gro receive code twice on a packet. This solves the problem of udp encapsulated packets whose inner VM packet is udp and happen to carry a port which has registered offloads. Signed-off-by: Shlomo Pongratz Signed-off-by: Or Gerlitz Signed-off-by: David S. Miller