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linux/include/net
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Eric Dumazet 614e8316aa tcp: add support for usec resolution in TCP TS values 
Back in 2015, Van Jacobson suggested to use usec resolution in TCP TS values.
This has been implemented in our private kernels.

Goals were :

1) better observability of delays in networking stacks.
2) better disambiguation of events based on TSval/ecr values.
3) building block for congestion control modules needing usec resolution.

Back then we implemented a schem based on private SYN options
to negotiate the feature.

For upstream submission, we chose to use a route attribute,
because this feature is probably going to be used in private
networks [1] [2].

ip route add 10/8 ... features tcp_usec_ts

Note that RFC 7323 recommends a
  "timestamp clock frequency in the range 1 ms to 1 sec per tick.",
but also mentions
  "the maximum acceptable clock frequency is one tick every 59 ns."

[1] Unfortunately RFC 7323 5.5 (Outdated Timestamps) suggests
to invalidate TS.Recent values after a flow was idle for more
than 24 days. This is the part making usec_ts a problem
for peers following this recommendation for long living
idle flows.

[2] Attempts to standardize usec ts went nowhere:

https://www.ietf.org/proceedings/97/slides/slides-97-tcpm-tcp-options-for-low-latency-00.pdf
https://datatracker.ietf.org/doc/draft-wang-tcpm-low-latency-opt/

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-10-23 09:35:01 +01:00
..
9p 9p: Add additional debug flags and open modes 2023-03-27 02:33:48 +00:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-19 13:29:01 -07:00
caif net: caif: Remove unused declaration cfsrvl_ctrlcmd() 2023-08-10 18:24:48 -07:00
iucv net/af_iucv: Use struct_group() to zero struct iucv_sock region 2021-11-19 11:52:25 +00:00
mana Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
netfilter netfilter: nf_tables: de-constify set commit ops function argument 2023-10-18 10:26:43 +02:00
netns Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-19 13:29:01 -07:00
nfc NFC: add NCI_UNREG flag to eliminate the race 2021-11-17 20:17:05 -08:00
page_pool page_pool: fragment API support for 32-bit arch with 64-bit DMA 2023-10-16 18:28:59 -07:00
phonet net: ioctl: Use kernel memory on protocol ioctl callbacks 2023-06-15 22:33:26 -07:00
sctp sctp: Remove unused declaration sctp_backlog_migrate() 2023-08-10 19:31:52 -07:00
tc_act net/sched: act_connmark: transition to percpu stats and rcu 2023-02-16 10:39:28 +01:00
6lowpan.h 6lowpan: Replace zero-length array with flexible-array member 2020-02-28 14:51:30 +01:00
act_api.h net/sched: Rename user cookie and act cookie 2023-02-20 16:46:10 -08:00
addrconf.h ipv6: constify inet6_mc_check() 2023-03-17 08:56:37 +00:00
af_ieee802154.h
af_rxrpc.h rxrpc: Fix timeout of a call that hasn't yet been granted a channel 2023-05-01 07:43:19 +01:00
af_unix.h af_unix: preserve const qualifier in unix_sk() 2023-03-18 12:23:33 +00:00
af_vsock.h vsock: check for MSG_ZEROCOPY support on send 2023-10-15 13:19:42 +01:00
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 2023-03-21 21:32:18 -07:00
atmclip.h
ax25.h x25: preserve const qualifier in [a]x25_sk() 2023-03-18 12:23:34 +00:00
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 bonding: 3ad: Remove unused declaration bond_3ad_update_lacp_active() 2023-07-28 18:06:30 -07:00
bond_alb.h bonding (gcc13): synchronize bond_{a,t}lb_xmit() types 2022-11-02 20:38:13 -07:00
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 2023-08-24 10:07:13 +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: invert the netdevice.h vs xdp.h dependency 2023-08-03 08:38:07 -07:00
calipso.h
cfg80211-wext.h wifi: cfg80211: Avoid clashing function prototypes 2022-11-16 11:31:47 +02:00
cfg80211.h Merge wireless into wireless-next 2023-10-06 17:08:47 +03:00
cfg802154.h net: cfg802154: fix kernel-doc notation warnings 2023-07-14 20:39:29 -07:00
checksum.h net: checksum: drop the linux/uaccess.h include 2023-01-27 11:19:46 +00:00
cipso_ipv4.h cipso: Remove unused inline functions 2020-07-15 07:45:24 -07:00
cls_cgroup.h bpf: Allow to retrieve cgroup v1 classid from v2 hooks 2020-03-27 19:40:38 -07:00
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: fix kernel-doc notation warnings 2023-07-14 20:39:29 -07:00
compat.h net: copy from user before calling __get_compat_msghdr 2022-07-24 18:39:17 -06:00
datalink.h net: datalink: Remove unused declarations 2023-07-27 17:17:32 -07:00
dcbevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
dcbnl.h net: dcb: add helper functions to retrieve PCP and DSCP rewrite maps 2023-01-20 09:33:22 +00:00
devlink.h devlink: convert most of devlink_fmsg_*() to return void 2023-10-20 11:34:51 +01:00
dropreason-core.h net, sched: Add tcf_set_drop_reason for {__,}tcf_classify 2023-10-16 10:07:37 -07:00
dropreason.h net: openvswitch: add last-action drop reason 2023-08-14 08:01:06 +01:00
dsa_stubs.h net: dsa: replace NETDEV_PRE_CHANGE_HWTSTAMP notifier with a stub 2023-04-09 15:35:49 +01:00
dsa.h net: dsa: notify drivers of MAC address changes on user ports 2023-10-03 13:51:02 +02:00
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 xfrm: interface: Add unstable helpers for setting/getting XFRM metadata from TC-BPF 2022-12-05 21:58:27 -08:00
dst_ops.h net: remove unnecessary input parameter 'how' in ifdown function 2023-08-22 13:19:02 +02:00
dst.h net: dst: remove unnecessary input parameter in dst_alloc and dst_init 2023-09-12 11:42:25 +02:00
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 xfrm: espintcp: save and call old ->sk_destruct 2020-04-20 07:34:16 +02:00
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 ipv6: Remove old route notifications and convert listeners 2019-12-24 22:37:30 -08:00
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 net: flow_dissector: Add IPSEC dissector 2023-08-02 10:09:31 +01:00
flow_offload.h flow_offload: Annotate struct flow_action_entry with __counted_by 2023-10-06 11:37:02 +01:00
flow.h ipv4: Drop tos parameter from flowi4_update_output() 2023-06-02 10:52:38 +01:00
fou.h bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs 2023-04-12 16:40:39 -07:00
fq_impl.h wifi: mac80211: add support for restricting netdev features per vif 2022-12-01 15:09:10 +01:00
fq.h net: fq: Remove unused typedef fq_flow_get_default_t 2023-08-08 15:58:23 -07:00
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 genetlink: add genlmsg_iput() API 2023-08-15 15:01:03 -07:00
geneve.h net: geneve: fix array of flexible structures warnings 2022-10-31 10:43:04 +00:00
gre.h ip_gre: add csum offload support for gre header 2021-01-29 20:39:14 -08:00
gro_cells.h
gro.h net: gro: fix misuse of CB in udp socket lookup 2023-07-29 17:10:27 +01:00
gso.h net: move gso declarations and functions to their own files 2023-06-10 00:11:41 -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
handshake.h net/handshake: Add helpers for parsing incoming TLS Alerts 2023-07-28 14:07:59 -07:00
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 wifi: radiotap: add bandwidth definition of EHT U-SIG 2023-10-12 15:14:27 +03:00
ieee802154_netdev.h mac802154: Handle received BEACON_REQ 2023-03-23 21:51:30 +01:00
if_inet6.h ipv6: Annotate struct ip6_sf_socklist with __counted_by 2023-10-02 11:24:52 -07:00
ife.h
inet_common.h net: factor out __inet_listen_sk() helper 2023-08-14 07:06:13 +01:00
inet_connection_sock.h tcp: Set pingpong threshold via sysctl 2023-10-16 14:55:32 -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 inet: frags: eliminate kernel-doc warning 2023-07-14 20:39:29 -07:00
inet_hashtables.h net: Fix slab-out-of-bounds in inet[6]_steal_sock 2023-08-15 13:57:51 -07:00
inet_sock.h ipv6: lockless IPV6_FLOWINFO_SEND implementation 2023-09-15 10:33:48 +01:00
inet_timewait_sock.h tcp: add support for usec resolution in TCP TS values 2023-10-23 09:35:01 +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: Fix slab-out-of-bounds in inet[6]_steal_sock 2023-08-15 13:57:51 -07:00
inetpeer.h
ioam6.h treewide: Replace zero-length arrays with flexible-array members 2022-02-17 07:00:39 -06:00
ip_fib.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-05 13:16:47 -07:00
ip_tunnels.h ip_tunnels: use DEV_STATS_INC() 2023-09-06 06:05:59 +01:00
ip_vs.h ipvs: Correct spelling in comments 2023-04-22 01:39:41 +02:00
ip.h inet: lock the socket in ip_sock_set_tos() 2023-10-19 13:13:13 +02:00
ip6_checksum.h net: move gro definitions to include/net/gro.h 2021-11-16 13:16:54 +00:00
ip6_fib.h net: fib: avoid warn splat in flow dissector 2023-08-31 12:33:03 +02:00
ip6_route.h ipv6: lockless IPV6_ADDR_PREFERENCES implementation 2023-09-19 18:21:44 +02:00
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
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: dropreason: add SKB_DROP_REASON_FRAG_REASM_TIMEOUT 2022-10-31 20:14:27 -07:00
ipv6_stubs.h bpf: Derive source IP addr via bpf_*_fib_lookup() 2023-10-09 16:28:35 -07:00
ipv6.h ipv6: rename and move ip6_dst_lookup_tunnel() 2023-10-23 08:48:57 +01:00
iw_handler.h wifi: wext: Remove unused declaration dev_get_wireless_info() 2023-08-22 21:40:40 +02:00
kcm.h kcm: Send multiple frags in one sendmsg() 2023-06-12 21:13:23 -07:00
l3mdev.h l3mdev: add infrastructure for table to VRF mapping 2020-06-20 17:22:22 -07:00
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: llc: Remove unused function declarations 2023-08-04 15:33:17 -07:00
llc_c_ev.h net: llc: Remove unused function declarations 2023-08-04 15:33:17 -07:00
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: Check netns in llc_estab_match() and llc_listener_match(). 2023-07-20 10:46:28 +02:00
llc_if.h llc/snap: constify dev_addr passing 2021-10-13 09:40:46 -07:00
llc_pdu.h net: llc: fix kernel-doc notation warnings 2023-07-14 20:39:29 -07:00
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 2023-08-18 16:05:26 +02:00
mac80211.h wifi: mac80211: support antenna control in injection 2023-09-25 09:12:34 +02:00
mac802154.h mac802154: Drop IEEE802154_HW_RX_DROP_BAD_CKSUM 2022-10-12 12:57:19 +02:00
macsec.h net: macsec: indicate next pn update when offloading 2023-10-10 10:30:30 +02:00
mctp.h mctp: Reorder fields in 'struct mctp_route' 2023-06-20 20:06:16 -07:00
mctpdevice.h mctp: Pass flow data & flow release events to drivers 2021-10-29 13:23:51 +01:00
mip6.h net: mip6: Replace zero-length array with flexible-array member 2020-03-02 11:16:27 -08:00
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 net: Make mpls_entry_encode() available for generic users 2020-05-29 21:20:20 -07:00
mptcp.h mptcp: add struct mptcp_sched_ops 2023-08-22 17:31:18 -07:00
mrp.h mrp: introduce active flags to prevent UAF when applicant uninit 2022-11-18 12:14:55 +00:00
ncsi.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
ndisc.h ndisc: Remove unused ndisc_ifinfo_sysctl_strategy() declaration 2023-08-07 08:53:55 +01:00
neighbour.h neighbour: fix data-races around n->output 2023-10-01 17:14:37 +01:00
net_debug.h net: add CONFIG_DEBUG_NET 2022-05-11 12:43:10 +01:00
net_failover.h
net_namespace.h net: treat possible_net_t net pointer as an RCU one and add read_pnet_rcu() 2023-10-18 09:23:01 +01:00
net_ratelimit.h
net_trackers.h net: add networking namespace refcount tracker 2021-12-10 06:38:26 -08:00
netdev_queues.h net: add macro netif_subqueue_completed_wake 2023-04-18 12:59:01 +02:00
netdev_rx_queue.h net: move struct netdev_rx_queue out of netdevice.h 2023-08-03 08:38:07 -07:00
netevent.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
netlabel.h
netlink.h netlink: add variable-length / auto integers 2023-10-20 11:43:35 +01:00
netprio_cgroup.h
netrom.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
nexthop.h nexthop: Annotate struct nh_group with __counted_by 2023-10-06 10:50:34 +01:00
nl802154.h ieee802154: Add support for user beaconing requests 2023-01-28 13:51:22 +01:00
nsh.h net: NSH: fix kernel-doc notation warning 2023-07-14 20:39:29 -07:00
p8022.h net: 802: Remove unused function declarations 2023-08-04 15:33:50 -07:00
pie.h pie: fix kernel-doc notation warning 2023-07-14 20:39:30 -07:00
ping.h net/ipv4: ping_group_range: allow GID from 2147483648 to 4294967294 2023-06-02 09:55:22 +01:00
pkt_cls.h net, sched: Make tc-related drop reason more flexible 2023-10-16 10:07:36 -07:00
pkt_sched.h net_sched: constify qdisc_priv() 2023-10-01 13:20:36 +01:00
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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-04-06 12:01:20 -07:00
rawv6.h ipv6: raw: constify raw_v6_match() socket argument 2023-03-17 08:56:37 +00:00
red.h treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
regulatory.h wifi: cfg80211: save power spectral density(psd) of regulatory rule 2023-09-18 09:44:05 +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 ipv4: rename and move ip_route_output_tunnel() 2023-10-16 09:57:52 +01:00
rpl.h ipv6: rpl: Remove pskb(_may)?_pull() in ipv6_rpl_srh_rcv(). 2023-06-19 11:32:58 -07:00
rsi_91x.h rsi: remove kernel-doc comment marker 2023-07-14 20:39:30 -07:00
rtnetlink.h net: validate veth and vxcan peer ifindexes 2023-08-20 11:40:03 +01:00
rtnh.h
sch_generic.h net, sched: Make tc-related drop reason more flexible 2023-10-16 10:07:36 -07:00
scm.h af_unix: Fix msg_controllen test in scm_pidfd_recv() for MSG_CMSG_COMPAT. 2023-09-04 11:00:17 +01:00
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: Introduce explicit check for v2 support 2023-03-15 08:18:35 +00:00
snmp.h
sock_reuseport.h soreuseport: Fix socket selection for SO_INCOMING_CPU. 2022-10-25 11:35:16 +02:00
sock.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-10-19 13:29:01 -07:00
Space.h net: appletalk: remove cops support 2023-10-04 11:49:20 -07:00
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: Remove unused declaration switchdev_port_fwd_mark_set() 2023-08-09 13:12:15 -07:00
tc_wrapper.h net/sched: Retire rsvp classifier 2023-02-16 09:27:07 +01:00
tcp_states.h
tcp.h tcp: add support for usec resolution in TCP TS values 2023-10-23 09:35:01 +01:00
tcx.h bpf: Add fd-based tcx multi-prog infra with link support 2023-07-19 10:07:27 -07:00
timewait_sock.h
tipc.h
tls_prot.h net/tls: Add TLS Alert definitions 2023-07-28 14:07:59 -07:00
tls_toe.h
tls.h tls: use fixed size for tls_offload_context_{tx,rx}.driver_state 2023-10-13 11:26:10 +01:00
transp_v6.h inet6: Remove unused function declaration udpv6_connect() 2023-08-01 15:06:27 -07:00
tso.h net: tso: inline tso_count_descs() 2022-12-12 15:04:39 -08:00
tun_proto.h net: add missing includes and forward declarations under net/ 2022-07-22 12:53:22 +01:00
udp_tunnel.h ipv6: add new arguments to udp_tunnel6_dst_lookup() 2023-10-23 08:48:57 +01:00
udp.h udp/udplite: Remove unused function declarations udp{,lite}_get_port() 2023-08-07 08:53:55 +01:00
udplite.h udplite: fix various data-races 2023-09-14 16:16:36 +02:00
vsock_addr.h
vxlan.h vxlan: Fix nexthop hash size 2023-08-02 10:58:26 +01:00
wext.h
x25.h x25: preserve const qualifier in [a]x25_sk() 2023-03-18 12:23:34 +00:00
x25device.h
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: support mbuf on ZC RX 2023-07-19 09:56:49 -07:00
xdp_sock.h xsk: add multi-buffer support for sockets sharing umem 2023-09-15 11:00:22 -07:00
xdp.h bpf: expose information about supported xdp metadata kfunc 2023-09-15 11:26:58 -07:00
xfrm.h ipv6: lockless IPV6_DONTFRAG implementation 2023-09-15 10:33:47 +01:00
xsk_buff_pool.h xsk: support mbuf on ZC RX 2023-07-19 09:56:49 -07:00