kernel.git/net/ipv6/fib6_rules.c, branch linux-5.14.y

ipv6: fib6: remove redundant initialization of variable err

2021-06-14T19:42:26Z

The variable err is being initialized with a value that is never read, the assignment is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King Signed-off-by: David S. Miller

fib: use indirect call wrappers in the most common fib_rules_ops

2020-07-29T00:42:31Z

This avoids another inderect call per RX packet which save us around 20-40 ns. Changelog: v1 -> v2: - Move declaraions to fib_rules.h to remove warnings Reported-by: kernel test robot Signed-off-by: Brian Vazquez Signed-off-by: David S. Miller

ipv6: fib6: avoid indirect calls from fib6_rule_lookup

2020-06-23T22:11:19Z

It was reported that a considerable amount of cycles were spent on the expensive indirect calls on fib6_rule_lookup. This patch introduces an inline helper called pol_route_func that uses the indirect_call_wrappers to avoid the indirect calls. This patch saves around 50ns per call. Performance was measured on the receiver by checking the amount of syncookies that server was able to generate under a synflood load. Traffic was generated using trafgen[1] which was pushing around 1Mpps on a single queue. Receiver was using only one rx queue which help to create a bottle neck and make the experiment rx-bounded. These are the syncookies generated over 10s from the different runs: Whithout the patch: TcpExtSyncookiesSent 3553749 0.0 TcpExtSyncookiesSent 3550895 0.0 TcpExtSyncookiesSent 3553845 0.0 TcpExtSyncookiesSent 3541050 0.0 TcpExtSyncookiesSent 3539921 0.0 TcpExtSyncookiesSent 3557659 0.0 TcpExtSyncookiesSent 3526812 0.0 TcpExtSyncookiesSent 3536121 0.0 TcpExtSyncookiesSent 3529963 0.0 TcpExtSyncookiesSent 3536319 0.0 With the patch: TcpExtSyncookiesSent 3611786 0.0 TcpExtSyncookiesSent 3596682 0.0 TcpExtSyncookiesSent 3606878 0.0 TcpExtSyncookiesSent 3599564 0.0 TcpExtSyncookiesSent 3601304 0.0 TcpExtSyncookiesSent 3609249 0.0 TcpExtSyncookiesSent 3617437 0.0 TcpExtSyncookiesSent 3608765 0.0 TcpExtSyncookiesSent 3620205 0.0 TcpExtSyncookiesSent 3601895 0.0 Without the patch the average is 354263 pkt/s or 2822 ns/pkt and with the patch the average is 360738 pkt/s or 2772 ns/pkt which gives an estimate of 50 ns per packet. [1] http://netsniff-ng.org/ Changelog since v1: - Change ordering in the ICW (Paolo Abeni) Cc: Luigi Rizzo Cc: Paolo Abeni Reported-by: Eric Dumazet Signed-off-by: Brian Vazquez Acked-by: Paolo Abeni Signed-off-by: David S. Miller

net: fib_notifier: propagate extack down to the notifier block callback

2019-10-04T18:10:56Z

Since errors are propagated all the way up to the caller, propagate possible extack of the caller all the way down to the notifier block callback. Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller

ipv6: do not free rt if FIB_LOOKUP_NOREF is set on suppress rule

2019-09-26T07:34:25Z

Commit 7d9e5f422150 removed references from certain dsts, but accounting for this never translated down into the fib6 suppression code. This bug was triggered by WireGuard users who use wg-quick(8), which uses the "suppress-prefix" directive to ip-rule(8) for routing all of their internet traffic without routing loops. The test case added here causes the reference underflow by causing packets to evaluate a suppress rule. Fixes: 7d9e5f422150 ("ipv6: convert major tx path to use RT6_LOOKUP_F_DST_NOREF") Signed-off-by: Jason A. Donenfeld Acked-by: Wei Wang Signed-off-by: David S. Miller

ipv6: honor RT6_LOOKUP_F_DST_NOREF in rule lookup logic

2019-06-23T20:24:17Z

This patch specifically converts the rule lookup logic to honor this flag and not release refcnt when traversing each rule and calling lookup() on each routing table. Similar to previous patch, we also need some special handling of dst entries in uncached list because there is always 1 refcnt taken for them even if RT6_LOOKUP_F_DST_NOREF flag is set. Signed-off-by: Wei Wang Signed-off-by: David S. Miller

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 372

2019-06-05T15:37:10Z

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 version 2 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 135 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190531081036.435762997@linutronix.de Signed-off-by: Greg Kroah-Hartman

ipv6: Use result arg in fib_lookup_arg consistently

2019-04-24T04:53:11Z

arg.result is sometimes used as fib6_result and sometimes used to hold the rt6_info. Add rt6_info to fib6_result and make the use of arg.result consistent through ipv6 rules. The rt6 entry is filled in for lookups returning a dst_entry, but not for direct fib_lookups that just want a fib6_info. Fixes: effda4dd97e8 ("ipv6: Pass fib6_result to fib lookups") Signed-off-by: David Ahern Signed-off-by: David S. Miller

ipv6: fib6_rule_action_alt needs to return -EAGAIN

2019-04-24T04:52:33Z

fib rule actions should return -EAGAIN for the rules to continue to the next one. A recent change overwrote err with the lookup always returning 0 (future change will make it more like IPv4) which means the rules stopped at the first (e.g., local table lookup only). Catch and reset err to -EAGAIN. Fixes: effda4dd97e87 ("ipv6: Pass fib6_result to fib lookups") Signed-off-by: David Ahern Signed-off-by: David S. Miller

ipv6: Pass fib6_result to fib lookups

2019-04-18T06:10:47Z

Change fib6_lookup and fib6_table_lookup to take a fib6_result and set f6i and nh rather than returning a fib6_info. For now both always return 0. A later patch set can make these more like the IPv4 counterparts and return EINVAL, EACCESS, etc based on fib6_type. Signed-off-by: David Ahern Signed-off-by: David S. Miller