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freebsd-src/sys/netinet
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Alexander V. Chernikov 936f4a42fa lltable: do not require prefix lookup when checking lle allocation rules. 
With the new FIB_ALGO infrastructure, nearly all subsystems use
 fib[46]_lookup() functions, which provides lockless lookups.
A number of places remains that uses old-style lookup functions, that
 still requires RIB read lock to return the result. One of such places
 is arp processing code.
FIB_ALGO implementation makes some tradeoffs, resulting in (relatively)
 prolonged periods of holding RIB_WLOCK. If the lock is held and datapath
 competes for it, the RX ring may get blocked, ending in traffic delays and losses.
As currently arp processing is performed directly in the interrupt handler,
 handling ARP replies triggers the problem descibed above when the amount of
 ARP replies is high.

To be more specific, prior to creating new ARP entry, routing lookup for the entry
 address in interface fib is executed. The following conditions are the verified:

1. If lookup returns an empty result, or the resulting prefix is non-directly-reachable,
 failure is returned. The only exception are host routes w/ gateway==address.
2. If the routing lookup returns different interface and non-host route,
 we want to support the use case of having multiple interfaces with the same prefix.
 In fact, the current code just checks if the returned prefix covers target address
 (always true) and effectively allow allocating ARP entries for any directly-reachable prefix,
 regardless of its interface.

Change the code to perform the following:

1) use fib4_lookup() to get the nexthop, instead of requesting exact prefix.
2) Rewrite first condition check using nexthop flags (1:1 match)
3) Rewrite second condition to check for interface addresses matching target address on
 the input interface.

Differential Revision: https://reviews.freebsd.org/D31824
Reviewed by:	ae
MFC after:	1 week
PR:	257965
2021-09-06 21:03:22 +00:00
..
cc tcp: fix two bugs in new reno 2021-06-11 15:40:34 +02:00
khelp
libalias libalias: fix divide by zero causing panic 2021-07-10 13:08:18 +02:00
netdump netdump: send key before dump, in case dump fails 2021-08-11 10:54:56 -05:00
tcp_stacks tcp: Add support for DSACK based reordering window to rack. 2021-08-17 16:29:22 -04:00
accf_data.c Define a module version for accept filter modules. 2020-05-19 18:35:08 +00:00
accf_dns.c Define a module version for accept filter modules. 2020-05-19 18:35:08 +00:00
accf_http.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
dccp.h Add header definition for RFC4340, Datagram Congestion Control Protocol 2020-06-17 13:27:13 +00:00
icmp6.h icmp6: Count packets dropped due to an invalid hop limit 2020-10-19 17:07:19 +00:00
icmp_var.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
if_ether.c Use lltable calculated header when sending lle holdchain after successful lle resolution. 2021-08-05 20:44:36 +00:00
if_ether.h
igmp.c igmp: Avoid an out-of-bounds access when zeroing counters 2021-05-05 17:12:51 -04:00
igmp.h
igmp_var.h igmp: convert igmpstat to use PCPU counters 2020-11-08 18:49:23 +00:00
in.c lltable: do not require prefix lookup when checking lle allocation rules. 2021-09-06 21:03:22 +00:00
in.h Add IP(V6)_VLAN_PCP to set 802.1 priority per-flow. 2020-10-09 12:06:43 +00:00
in_cksum.c
in_debug.c
in_fib.c Fix some common typos in comments 2021-08-08 10:16:06 +02:00
in_fib.h Refactor fib4/fib6 functions. 2020-11-29 13:41:49 +00:00
in_fib_algo.c Fix IPv4 fib bsearch4() lookup array construction. 2021-01-17 20:32:26 +00:00
in_fib_dxr.c Introduce DXR as an IPv4 longest prefix matching / FIB module 2021-05-05 13:45:52 +02:00
in_gif.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
in_jail.c
in_kdtrace.c Separate out SCTP related dtrace code. 2019-10-14 20:32:11 +00:00
in_kdtrace.h Separate out SCTP related dtrace code. 2019-10-14 20:32:11 +00:00
in_mcast.c Always use inp fib in the inp_lookup_mcast_ifp(). 2021-04-10 13:47:49 +00:00
in_pcb.c Add missing sockaddr length and family validation to various protocols 2021-05-03 13:35:19 -04:00
in_pcb.h tcp: HPTS performance enhancements 2021-07-07 07:22:35 -04:00
in_pcbgroup.c inet(3): Fix a few common typos in source code comments 2021-08-28 18:53:02 +02:00
in_prot.c
in_proto.c capsicum: Limit socket operations in capability mode 2021-04-07 14:32:56 -04:00
in_rmx.c Refactor rib iterator functions. 2020-11-22 20:21:10 +00:00
in_rss.c Implement flowid calculation for outbound connections to balance 2020-10-18 17:15:47 +00:00
in_rss.h Implement flowid calculation for outbound connections to balance 2020-10-18 17:15:47 +00:00
in_systm.h
in_var.h net: remove legacy in_addmulti() 2021-02-25 10:13:52 +01:00
ip.h
ip6.h net: Introduce IPV6_DSCP(), IPV6_ECN() and IPV6_TRAFFIC_CLASS() macros 2021-03-04 20:56:48 +01:00
ip_carp.c Further refactor IPv4 interface route creation. 2021-01-21 21:48:49 +00:00
ip_carp.h carp: replace caddr_t with char * 2019-12-06 16:35:48 +00:00
ip_divert.c socket: Implement SO_RERROR 2021-07-28 09:35:09 -07:00
ip_divert.h
ip_dummynet.h ipfw: use unsigned int for dummynet bandwidth 2021-08-19 10:48:53 +02:00
ip_ecn.c
ip_ecn.h
ip_encap.c Widen NET_EPOCH coverage. 2019-10-07 22:40:05 +00:00
ip_encap.h
ip_fastfwd.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
ip_fw.h Allow setting alias port ranges in libalias and ipfw. This will allow a system 2021-02-02 13:24:17 -08:00
ip_gre.c Introduce NET_EPOCH_CALL() macro and use it everywhere where we free 2020-01-15 06:05:20 +00:00
ip_icmp.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
ip_icmp.h
ip_id.c Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
ip_input.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
ip_mroute.c mroute: fix locking issues 2021-08-13 11:06:17 +02:00
ip_mroute.h ip_mroute: rework ip_mroute 2021-05-31 05:48:15 +02:00
ip_options.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
ip_options.h
ip_output.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
ip_reass.c ip_reass: do less work in ipreass_slowtimo if possible 2021-08-14 18:50:12 +02:00
ip_var.h An earlier commit effectively turned out the fast forwading path 2020-11-12 21:58:47 +00:00
pim.h
pim_var.h
raw_ip.c ipsec: Handle ICMP NEEDFRAG message. 2021-08-09 12:01:46 +02:00
sctp.h Improve the handling of cookie life times. 2020-10-16 10:44:48 +00:00
sctp_asconf.c sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
sctp_asconf.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_auth.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_auth.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_bsd_addr.c Don't pass RFPROC to kproc_create(), it is redundant. 2021-03-12 09:48:10 -08:00
sctp_bsd_addr.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_cc_functions.c sctp: remove some set, but unused variables 2021-08-09 15:58:46 +02:00
sctp_constants.h sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
sctp_crc32.c No need to include netinet/sctp_crc32.h twice. 2020-06-22 14:36:14 +00:00
sctp_crc32.h Add the SCTP_SUPPORT kernel option. 2020-06-18 19:32:34 +00:00
sctp_header.h Whitespace changes. 2020-09-24 12:26:06 +00:00
sctp_indata.c sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
sctp_indata.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_input.c sctp: Always check for a vanishing inpcb when processing COOKIE-ECHO 2021-09-01 10:28:17 -04:00
sctp_input.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_kdtrace.c Separate out SCTP related dtrace code. 2019-10-14 20:32:11 +00:00
sctp_kdtrace.h Separate out SCTP related dtrace code. 2019-10-14 20:32:11 +00:00
sctp_lock_bsd.h sctp: Add macros to assert on inp info lock state 2021-09-01 10:06:18 -04:00
sctp_module.c Provide support for building SCTP as a loadable module. 2020-07-10 14:56:05 +00:00
sctp_os.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_os_bsd.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_output.c Fix a common typo in source code comments 2021-09-04 12:56:57 +02:00
sctp_output.h Whitespace changes. 2020-09-24 12:26:06 +00:00
sctp_pcb.c sctp: Hold association locks across socket wakeups when freeing 2021-09-01 10:27:51 -04:00
sctp_pcb.h sctp: Implement sctp_inpcb_bind_locked() 2021-09-01 10:06:18 -04:00
sctp_peeloff.c Non-functional changes due to upstream cleanup. 2020-06-11 13:34:09 +00:00
sctp_peeloff.h
sctp_ss_functions.c Fix a few typos in comments 2021-03-13 16:37:28 +01:00
sctp_structs.h sctp: improve consistency 2021-01-24 00:07:41 +01:00
sctp_syscalls.c Convert remaining cap_rights_init users to cap_rights_init_one 2021-01-12 13:16:10 +00:00
sctp_sysctl.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_sysctl.h Improve the handling of cookie life times. 2020-10-16 10:44:48 +00:00
sctp_timer.c sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
sctp_timer.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_uio.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctp_usrreq.c sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
sctp_var.h net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
sctputil.c sctp: improve input validation of mapped addresses in sctp_connectx() 2021-08-07 15:12:09 +02:00
sctputil.h sctp: Fix errno in case of association setup failures 2021-07-09 23:19:25 +02:00
siftr.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
tcp.h tcp: Add support for DSACK based reordering window to rack. 2021-08-17 16:29:22 -04:00
tcp_accounting.h This brings into sync FreeBSD with the netflix versions of rack and bbr. 2021-05-06 11:22:26 -04:00
tcp_debug.c
tcp_debug.h
tcp_fastopen.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
tcp_fastopen.h
tcp_fsm.h tcp: Remove unused v6 state definitions 2021-08-27 08:31:32 -04:00
tcp_hostcache.c tcp_hostcache: use SMR for lookups, mutex(9) for updates. 2021-04-20 10:02:20 -07:00
tcp_hpts.c tcp: Fix 32 bit platform breakage 2021-07-08 08:16:45 -04:00
tcp_hpts.h tcp: HPTS performance enhancements 2021-07-07 07:22:35 -04:00
tcp_input.c tcp: Add PRR cwnd reduction for non-SACK loss 2021-06-19 19:25:22 +02:00
tcp_log_buf.c net: clean up empty lines in .c and .h files 2020-09-01 21:19:14 +00:00
tcp_log_buf.h tcp: Add support for DSACK based reordering window to rack. 2021-08-17 16:29:22 -04:00
tcp_lro.c tcp: make network epoch expectations of LRO explicit 2021-08-25 17:12:36 +02:00
tcp_lro.h Update the TCP LRO code to handle both encrypted and un-encrypted traffic. 2021-08-06 11:28:44 +02:00
tcp_offload.c Path MTU discovery hooks for offloaded TCP connections. 2021-04-21 13:00:16 -07:00
tcp_offload.h Path MTU discovery hooks for offloaded TCP connections. 2021-04-21 13:00:16 -07:00
tcp_output.c tcp: Preparation for allowing hardware TLS to be able to kick a tcp connection that is retransmitting too much out of hardware and back to software. 2021-06-25 09:30:54 -04:00
tcp_pcap.c Step 4.2: start divorce of M_EXT and M_EXTPG 2020-05-03 00:37:16 +00:00
tcp_pcap.h
tcp_ratelimit.c This brings into sync FreeBSD with the netflix versions of rack and bbr. 2021-05-06 11:22:26 -04:00
tcp_ratelimit.h This takes Warners suggested approach to making it so that 2021-05-07 17:32:32 -04:00
tcp_reass.c tcp: A better fix for the previously attempted fix of the ack-war issue with tcp. 2021-06-04 05:26:43 -04:00
tcp_sack.c tcp: SACK Lost Retransmission Detection (LRD) 2021-05-10 19:06:20 +02:00
tcp_seq.h
tcp_stats.c Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
tcp_subr.c tcp: TCP_LRO getting bad checksums and sending it in to TCP incorrectly. 2021-07-13 12:45:15 -04:00
tcp_syncache.c Unbreak TFO, that was broken with 8d5719aa74. These two assignments 2021-06-22 16:03:44 -07:00
tcp_syncache.h tcp: add support for TCP over UDP 2021-04-18 16:16:42 +02:00
tcp_timer.c Improve the TCP blackhole detection. The principle is to reduce the 2020-04-14 16:35:05 +00:00
tcp_timer.h kern: net: remove TCP_LINGERTIME 2021-02-18 22:36:01 -06:00
tcp_timewait.c tcp_twcheck(): use correct unlock macro. 2021-05-06 10:19:21 -07:00
tcp_usrreq.c tcp, udp: improve input validation in handling bind() 2021-08-05 13:48:44 +02:00
tcp_var.h ktls: Move KERN_TLS ifdef to tcp_var.h 2021-08-05 19:17:35 -04:00
tcpip.h
toecore.c routing: Allow using IPv6 next-hops for IPv4 routes (RFC 5549). 2021-08-22 22:56:08 +00:00
toecore.h Path MTU discovery hooks for offloaded TCP connections. 2021-04-21 13:00:16 -07:00
udp.h White space cleanup -- remove trailing tab's or spaces 2020-02-12 13:31:36 +00:00
udp_usrreq.c tcp, udp: improve input validation in handling bind() 2021-08-05 13:48:44 +02:00
udp_var.h Add a knob to allow zero UDP checksums for UDP/IPv6 traffic on the given UDP port. 2020-09-18 02:21:15 +00:00
udplite.h White space cleanup -- remove trailing tab's or spaces 2020-02-12 13:31:36 +00:00