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Jon Maxwell 0f22c8a6ef ipv6: remove max_size check inline with ipv4 
commit af6d10345ca76670c1b7c37799f0d5576ccef277 upstream.

In ip6_dst_gc() replace:

  if (entries > gc_thresh)

With:

  if (entries > ops->gc_thresh)

Sending Ipv6 packets in a loop via a raw socket triggers an issue where a
route is cloned by ip6_rt_cache_alloc() for each packet sent. This quickly
consumes the Ipv6 max_size threshold which defaults to 4096 resulting in
these warnings:

[1]   99.187805] dst_alloc: 7728 callbacks suppressed
[2] Route cache is full: consider increasing sysctl net.ipv6.route.max_size.
.
.
[300] Route cache is full: consider increasing sysctl net.ipv6.route.max_size.

When this happens the packet is dropped and sendto() gets a network is
unreachable error:

remaining pkt 200557 errno 101
remaining pkt 196462 errno 101
.
.
remaining pkt 126821 errno 101

Implement David Aherns suggestion to remove max_size check seeing that Ipv6
has a GC to manage memory usage. Ipv4 already does not check max_size.

Here are some memory comparisons for Ipv4 vs Ipv6 with the patch:

Test by running 5 instances of a program that sends UDP packets to a raw
socket 5000000 times. Compare Ipv4 and Ipv6 performance with a similar
program.

Ipv4:

Before test:

MemFree:        29427108 kB
Slab:             237612 kB

ip6_dst_cache       1912   2528    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache        2881   3990    192   42    2 : tunables    0    0    0

During test:

MemFree:        29417608 kB
Slab:             247712 kB

ip6_dst_cache       1912   2528    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache       44394  44394    192   42    2 : tunables    0    0    0

After test:

MemFree:        29422308 kB
Slab:             238104 kB

ip6_dst_cache       1912   2528    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache        3048   4116    192   42    2 : tunables    0    0    0

Ipv6 with patch:

Errno 101 errors are not observed anymore with the patch.

Before test:

MemFree:        29422308 kB
Slab:             238104 kB

ip6_dst_cache       1912   2528    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache        3048   4116    192   42    2 : tunables    0    0    0

During Test:

MemFree:        29431516 kB
Slab:             240940 kB

ip6_dst_cache      11980  12064    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache        3048   4116    192   42    2 : tunables    0    0    0

After Test:

MemFree:        29441816 kB
Slab:             238132 kB

ip6_dst_cache       1902   2432    256   32    2 : tunables    0    0    0
xfrm_dst_cache         0      0    320   25    2 : tunables    0    0    0
ip_dst_cache        3048   4116    192   42    2 : tunables    0    0    0

Tested-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: Jon Maxwell <jmaxwell37@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20230112012532.311021-1-jmaxwell37@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Cc: "Jitindar Singh, Suraj" <surajjs@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-15 18:54:51 +01:00
..
9p
net/9p: add 'pooled_rbuffers' flag to struct p9_trans_module
2022-10-05 07:05:41 +09:00
bluetooth
Bluetooth: MGMT/SMP: Fix address type when using SMP over BREDR/LE
2024-01-01 12:39:03 +00:00
caif
net: remove the caif_hsi driver
2021-07-01 13:19:48 -07:00
iucv
net/af_iucv: Use struct_group() to zero struct iucv_sock region
2021-11-19 11:52:25 +00:00
netfilter
net/sched: act_ct: Always fill offloading tuple iifidx
2024-01-10 17:10:36 +01:00
netns
xfrm: fix a data-race in xfrm_gen_index()
2023-10-25 12:03:06 +02:00
nfc
NFC: add NCI_UNREG flag to eliminate the race
2021-11-17 20:17:05 -08:00
phonet
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
sctp
sctp: add a refcnt in sctp_stream_priorities to avoid a nested loop
2023-03-11 13:55:26 +01:00
tc_act
net/sched: transition act_pedit to rcu and percpu stats
2023-03-11 13:55:28 +01:00
6lowpan.h
…
act_api.h
net: sched: act: move global static variable net_id to tc_action_ops
2022-09-09 08:24:41 +01:00
addrconf.h
net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX
2023-12-20 17:00:15 +01:00
af_ieee802154.h
…
af_rxrpc.h
rxrpc: Remove rxrpc_get_reply_time() which is no longer used
2022-09-01 11:44:13 +01:00
af_unix.h
bpf, sockmap: af_unix stream sockets need to hold ref for pair sock
2024-01-10 17:10:32 +01:00
af_vsock.h
vsock: add API call for data ready
2022-08-23 10:43:11 +02:00
ah.h
…
amt.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
arp.h
neighbour: switch to standard rcu, instead of rcu_bh
2023-10-10 22:00:42 +02:00
atmclip.h
…
ax25.h
ax25: fix incorrect dev_tracker usage
2022-07-28 22:06:15 -07:00
ax88796.h
ax88796: Fix some typo in a comment
2022-08-09 22:14:02 -07:00
bareudp.h
bareudp: Move definition of struct bareudp_conf to bareudp.c
2021-12-13 12:34:09 +00:00
bond_3ad.h
net: bonding: Share lacpdu_mcast_addr definition
2022-09-16 14:34:01 +01:00
bond_alb.h
bonding (gcc13): synchronize bond_{a,t}lb_xmit() types
2023-05-11 23:03:41 +09:00
bond_options.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
bonding.h
bonding: fix macvlan over alb bond support
2023-08-30 16:11:04 +02:00
bpf_sk_storage.h
bpf: struct sock is declared twice in bpf_sk_storage header
2021-03-26 17:43:55 +01:00
busy_poll.h
net: Fix a data-race around sysctl_net_busy_poll.
2022-08-24 13:46:58 +01:00
calipso.h
…
cfg80211-wext.h
…
cfg80211.h
wifi: cfg80211: fix kernel-doc for wiphy_delayed_work_flush()
2023-11-20 11:52:18 +01:00
cfg802154.h
net: wrap the wireless pointers in struct net_device in an ifdef
2022-05-22 21:51:54 +01:00
checksum.h
powerpc/net: Implement powerpc specific csum_shift() to remove branch
2022-03-11 10:57:22 +00:00
cipso_ipv4.h
…
cls_cgroup.h
…
codel_impl.h
codel: remove unnecessary sock.h include
2021-12-22 15:03:47 -08:00
codel_qdisc.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
codel.h
codel: remove unnecessary pkt_sched.h include
2021-12-22 15:03:51 -08:00
compat.h
net: copy from user before calling __get_compat_msghdr
2022-07-24 18:39:17 -06:00
datalink.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
dcbevent.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
dcbnl.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
devlink.h
net: devlink: add port_init/fini() helpers to allow pre-register/post-unregister functions
2022-09-30 18:17:16 -07:00
dropreason.h
net: skb: export skb drop reaons to user by TRACE_DEFINE_ENUM
2022-09-07 15:28:08 +01:00
dsa.h
net: dsa: remove bool devlink_port_setup
2022-09-30 18:17:17 -07:00
dsfield.h
…
dst_cache.h
wireguard: device: reset peer src endpoint when netns exits
2021-11-29 19:50:45 -08:00
dst_metadata.h
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next
2022-10-03 07:52:13 +01:00
dst_ops.h
ipv6: remove max_size check inline with ipv4
2024-01-15 18:54:51 +01:00
dst.h
net: add atomic_long_t to net_device_stats fields
2022-12-31 13:33:02 +01:00
erspan.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
esp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
espintcp.h
…
ethoc.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
failover.h
net: failover: add net device refcount tracker
2021-12-06 16:06:02 -08:00
fib_notifier.h
…
fib_rules.h
fib: expand fib_rule_policy
2021-12-16 07:18:35 -08:00
firewire.h
firewire: net: Make use of get_unaligned_be48(), put_unaligned_be48()
2022-07-28 22:21:54 -07:00
flow_dissector.h
flow_dissector: Add L2TPv3 dissectors
2022-09-20 09:13:38 +02:00
flow_offload.h
flow_offload: Introduce flow_match_l2tpv3
2022-09-20 09:13:38 +02:00
flow.h
inet: shrink struct flowi_common
2023-11-20 11:52:15 +01:00
fou.h
…
fq_impl.h
net/fq_impl: Use the bitmap API to allocate bitmaps
2022-07-11 19:49:38 -07:00
fq.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
garp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
gen_stats.h
net: sched: Remove Qdisc::running sequence counter
2021-10-18 12:54:41 +01:00
genetlink.h
drop_monitor: Require 'CAP_SYS_ADMIN' when joining "events" group
2023-12-13 18:39:12 +01:00
geneve.h
…
gre.h
ip_gre: add csum offload support for gre header
2021-01-29 20:39:14 -08:00
gro_cells.h
…
gro.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2022-08-25 16:07:42 -07:00
gtp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
gue.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
hwbm.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
icmp.h
ipv6: ICMPV6: add response to ICMPV6 RFC 8335 PROBE messages
2021-06-28 14:29:45 -07:00
ieee80211_radiotap.h
ieee80211: radiotap: fix -Wcast-qual warnings
2022-02-04 16:25:21 +01:00
ieee802154_netdev.h
net: ieee802154: return -EINVAL for unknown addr type
2022-10-07 08:42:00 +01:00
if_inet6.h
net: ipv6: support reporting otherwise unknown prefix flags in RTM_NEWPREFIX
2023-12-20 17:00:15 +01:00
ife.h
…
ila.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet6_connection_sock.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet6_hashtables.h
net: allow unbound socket for packets in VRF when tcp_l3mdev_accept set
2022-07-29 11:58:54 +01:00
inet_common.h
ipv4, ipv6: Use splice_eof() to flush
2024-01-10 17:10:27 +01:00
inet_connection_sock.h
net: Add a bhash2 table hashed by port and address
2022-08-24 19:30:07 -07:00
inet_dscp.h
ipv6: Define dscp_t and stop taking ECN bits into account in fib6-rules
2022-02-07 20:12:45 -08:00
inet_ecn.h
net: add skb_get_dsfield() helper
2021-10-15 11:33:08 +01:00
inet_frag.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
inet_hashtables.h
tcp: Add TIME_WAIT sockets in bhash2.
2023-01-12 12:02:15 +01:00
inet_sock.h
ipv4: fix data-races around inet->inet_id
2023-08-30 16:11:02 +02:00
inet_timewait_sock.h
tcp: Add TIME_WAIT sockets in bhash2.
2023-01-12 12:02:15 +01:00
inetpeer.h
…
ioam6.h
treewide: Replace zero-length arrays with flexible-array members
2022-02-17 07:00:39 -06:00
ip6_checksum.h
net: move gro definitions to include/net/gro.h
2021-11-16 13:16:54 +00:00
ip6_fib.h
ipv6: Remove in6addr_any alternatives.
2023-09-19 12:28:10 +02:00
ip6_route.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
ip6_tunnel.h
ip_gre, ip6_gre: Fix race condition on o_seqno in collect_md mode
2022-04-25 11:40:45 +01:00
ip_fib.h
ipv4/fib: send notify when delete source address routes
2023-10-25 12:03:11 +02:00
ip_tunnels.h
ip_tunnels: use DEV_STATS_INC()
2023-09-19 12:28:03 +02:00
ip_vs.h
ipvs: Update width of source for ip_vs_sync_conn_options
2023-05-24 17:32:39 +01:00
ip.h
net: annotate data-races around sk->sk_tsflags
2024-01-10 17:10:23 +01:00
ipcomp.h
xfrm: ipcomp: add extack to ipcomp{4,6}_init_state
2022-09-29 07:18:00 +02:00
ipconfig.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
ipv6_frag.h
net: don't include ndisc.h from ipv6.h
2022-02-04 14:15:11 -08:00
ipv6_stubs.h
bpf: Change bpf_getsockopt(SOL_IPV6) to reuse do_ipv6_getsockopt()
2022-09-02 20:34:32 -07:00
ipv6.h
tcp: Fix bind() regression for v4-mapped-v6 wildcard address.
2023-09-19 12:28:10 +02:00
iw_handler.h
…
kcm.h
…
l3mdev.h
…
lag.h
…
lapb.h
net: lapb: Make "lapb_t1timer_running" able to detect an already running timer
2021-03-23 14:14:50 -07:00
lib80211.h
…
llc_c_ac.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_c_ev.h
…
llc_c_st.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_conn.h
llc: add net device refcount tracker
2021-12-07 20:44:59 -08:00
llc_if.h
llc/snap: constify dev_addr passing
2021-10-13 09:40:46 -07:00
llc_pdu.h
net: llc: fix skb_over_panic
2021-07-27 13:05:56 +01:00
llc_s_ac.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_s_ev.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
llc_s_st.h
add missing includes and forward declarations to networking includes under linux/
2022-07-28 11:29:36 +02:00
llc_sap.h
…
llc.h
llc: fix out-of-bound array index in llc_sk_dev_hash()
2021-11-07 19:25:29 +00:00
lwtunnel.h
lwt: Check LWTUNNEL_XMIT_CONTINUE strictly
2023-09-13 09:42:33 +02:00
mac80211.h
mac80211: make ieee80211_tx_info padding explicit
2023-09-13 09:42:34 +02:00
mac802154.h
net: mac802154: Create an error helper for asynchronous offloading errors
2022-04-25 20:51:12 +02:00
macsec.h
net: macsec: indicate next pn update when offloading
2023-10-19 23:08:53 +02:00
mctp.h
mctp: Use output netdev to allocate skb headroom
2022-04-01 12:04:15 +01:00
mctpdevice.h
mctp: Pass flow data & flow release events to drivers
2021-10-29 13:23:51 +01:00
mip6.h
…
mld.h
mld: add new workqueues for process mld events
2021-03-26 15:14:56 -07:00
mpls_iptunnel.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
mpls.h
…
mptcp.h
mptcp: remove MPTCP 'ifdef' in TCP SYN cookies
2023-01-07 11:11:44 +01:00
mrp.h
mrp: introduce active flags to prevent UAF when applicant uninit
2022-12-31 13:33:02 +01:00
ncsi.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
ndisc.h
neighbour: switch to standard rcu, instead of rcu_bh
2023-10-10 22:00:42 +02:00
neighbour.h
neighbour: fix data-races around n->output
2023-10-10 22:00:42 +02:00
net_debug.h
net: add CONFIG_DEBUG_NET
2022-05-11 12:43:10 +01:00
net_failover.h
…
net_namespace.h
netfilter: nf_flow_table: count pending offload workqueue tasks
2022-07-11 16:25:14 +02:00
net_ratelimit.h
…
net_trackers.h
net: add networking namespace refcount tracker
2021-12-10 06:38:26 -08:00
netevent.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
netlabel.h
…
netlink.h
netlink: split up copies in the ack construction
2023-10-10 22:00:44 +02:00
netprio_cgroup.h
…
netrom.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
nexthop.h
ipv6: remove nexthop_fib6_nh_bh()
2023-10-10 22:00:46 +02:00
nl802154.h
net: ieee802154: Fix compilation error when CONFIG_IEEE802154_NL802154_EXPERIMENTAL is disabled
2022-09-02 19:59:08 -07:00
nsh.h
…
p8022.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
page_pool.h
page_pool: fix inconsistency for page_pool_ring_[un]lock()
2023-06-05 09:26:20 +02:00
pie.h
…
ping.h
net/ipv4: ping_group_range: allow GID from 2147483648 to 4294967294
2023-06-14 11:15:16 +02:00
pkt_cls.h
net: sched: cls_api: introduce tc_cls_bind_class() helper
2022-10-02 16:07:17 +01:00
pkt_sched.h
net/sched: make psched_mtu() RTNL-less safe
2023-07-23 13:49:27 +02:00
pptp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
protocol.h
tcp/udp: Make early_demux back namespacified.
2022-07-15 18:50:35 -07:00
psample.h
psample: Add a fwd declaration for skbuff
2021-08-09 15:34:21 -07:00
psnap.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
raw.h
raw: Fix NULL deref in raw_get_next().
2023-04-13 16:55:23 +02:00
rawv6.h
raw: convert raw sockets to RCU
2022-06-19 10:00:02 +01:00
red.h
treewide: use get_random_u32() when possible
2022-10-11 17:42:58 -06:00
regulatory.h
wifi: cfg80211: fix regulatory disconnect with OCB/NAN
2023-07-19 16:21:10 +02:00
request_sock.h
tcp: Use BPF timeout setting for SYN ACK RTO
2022-02-02 14:45:18 +00:00
rose.h
net: rose: add netdev ref tracker to 'struct rose_sock'
2022-08-01 11:59:23 -07:00
route.h
net: annotate data-races around sk->sk_mark
2023-08-11 12:08:14 +02:00
rpl.h
ipv6: rpl: Fix Route of Death.
2023-06-14 11:15:20 +02:00
rsi_91x.h
…
rtnetlink.h
net: validate veth and vxcan peer ifindexes
2023-08-30 16:11:02 +02:00
rtnh.h
…
sch_generic.h
net/sched: qdisc_destroy() old ingress and clsact Qdiscs before grafting
2023-06-21 16:01:01 +02:00
scm.h
scm: fix MSG_CTRUNC setting condition for SO_PASSSEC
2023-05-11 23:03:18 +09:00
secure_seq.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
seg6_hmac.h
…
seg6_local.h
…
seg6.h
udp6: Use Segment Routing Header for dest address if present
2022-01-04 12:17:35 +00:00
selftests.h
net: selftest: fix build issue if INET is disabled
2021-04-28 14:06:45 -07:00
slhc_vj.h
…
smc.h
net/smc: Pass on DMBE bit mask in IRQ handler
2022-07-27 13:24:42 +01:00
snmp.h
…
sock_reuseport.h
soreuseport: Fix socket selection for SO_INCOMING_CPU.
2022-12-31 13:32:04 +01:00
sock.h
bpf: syzkaller found null ptr deref in unix_bpf proto add
2024-01-10 17:10:36 +01:00
Space.h
wan: remove sbni/granch driver
2021-08-03 13:05:26 +01:00
stp.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
strparser.h
tls: rx: remove the message decrypted tracking
2022-07-18 11:24:10 +01:00
switchdev.h
net: switchdev: add reminder near struct switchdev_notifier_fdb_info
2022-06-29 20:37:36 -07:00
tcp_states.h
…
tcp.h
ipv4, ipv6: Use splice_eof() to flush
2024-01-10 17:10:27 +01:00
timewait_sock.h
…
tipc.h
…
tls_toe.h
…
tls.h
tls: rx: strp: preserve decryption status of skbs when needed
2023-06-05 09:26:18 +02:00
transp_v6.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
tso.h
…
tun_proto.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
udp_tunnel.h
udp: lockless UDP_ENCAP_L2TPINUDP / UDP_GRO
2024-01-10 17:10:28 +01:00
udp.h
ipv4, ipv6: Use splice_eof() to flush
2024-01-10 17:10:27 +01:00
udplite.h
tcp/udp: Call inet6_destroy_sock() in IPv6 sk->sk_destruct().
2022-10-12 17:50:37 -07:00
vsock_addr.h
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vxlan.h
vxlan: Fix nexthop hash size
2023-08-11 12:08:17 +02:00
wext.h
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x25.h
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x25device.h
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xdp_priv.h
net: add missing includes and forward declarations under net/
2022-07-22 12:53:22 +01:00
xdp_sock_drv.h
xsk: Remove unused xsk_buff_discard
2022-09-30 07:55:46 -07:00
xdp_sock.h
net: Don't include filter.h from net/sock.h
2021-12-29 08:48:14 -08:00
xdp.h
xdp: Adjust xdp_frame layout to avoid using bitfields
2022-09-26 13:28:19 -07:00
xfrm.h
xfrm: Treat already-verified secpath entries as optional
2023-06-28 11:12:28 +02:00
xsk_buff_pool.h
xsk: Fix unaligned descriptor validation
2023-05-11 23:03:21 +09:00