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linux/net/core
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Willem de Bruijn 73f1a618b0 net: ensure SCM_TXTIME delivery time is no older than system boot 
Limit input to sane values to avoid having to add tests later in the
kernel hot path, e.g., in FQ.

SCM_TXTIME timestamps are converted to signed ktime_t when assigned to
skb->tstamp. Avoid having negative values overflow into large positive
ones when again used as u64, e.g., in FQ time_to_send.

For CLOCK_MONOTONIC, only allow positive values.

For CLOCK_REALTIME and CLOCK_TAI, allow equivalent values, i.e., no
older than the boot of the machine.

skb->tstamp zero is a special case signaling feature off. This is not
converted between clockids.

Handle the special case where the realtime clock is set so small that
real - mono is negative, however unlikely in practice.

Ideally we would also set a sane upper bound, but that would require
reading the clock, which is an expensive operation. Continue to defer
that validation to users of the data. FQ already does this.

Bound rather than return error on older timestamps. This is the
existing policy e.g., in FQ.

Signed-off-by: Willem de Bruijn <willemb@google.com>

----

Changes
  v1 -> v2
    - remove spurious semicolon at end of switch
    - remove Fixes tag

Link: https://patch.msgid.link/20260604194221.3319080-2-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-06-08 16:00:05 -07:00
..
bpf_sk_storage.c bpf: Fix sk_local_storage diag dumping uninitialized special fields 2026-04-24 11:21:34 -07:00
datagram.c net: datagram: introduce datagram_poll_queue for custom receive queues 2025-10-23 15:46:04 +02:00
dev_addr_lists_test.c net: cache snapshot entries for ndo_set_rx_mode_async 2026-04-21 12:50:13 +02:00
dev_addr_lists.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
dev_api.c net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work 2026-04-21 12:50:03 +02:00
dev_ioctl.c net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work 2026-04-21 12:50:03 +02:00
dev.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
dev.h rtnetlink: use dev_isalive() in rtnl_getlink() 2026-06-04 18:16:14 -07:00
devmem.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-05-21 15:09:02 -07:00
devmem.h net: devmem: support TX over NETMEM_TX_NO_DMA devices 2026-05-18 18:49:06 -07:00
drop_monitor.c net: constify sk_skb_reason_drop() sock parameter 2026-05-12 18:31:11 -07:00
dst_cache.c net: dst: annotate data-races around dst->obsolete 2025-07-02 14:32:29 -07:00
dst.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
failover.c net: net_failover: Fix the deadlock in slave register 2026-05-13 19:01:03 -07:00
fib_notifier.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
fib_rules.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2025-04-17 12:26:50 -07:00
filter.c bpf: sockmap: fix tail fragment offset in bpf_msg_push_data 2026-05-29 12:38:35 -07:00
flow_dissector.c flow_dissector: do not dissect PPPoE PFC frames 2026-04-20 11:35:16 -07:00
flow_offload.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
gen_estimator.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
gen_stats.c net/sched: add const qualifiers to gnet_stats helpers 2026-05-11 18:28:08 -07:00
gro_cells.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
gro.c net: gro: don't merge zcopy skbs 2026-05-21 08:21:33 -07:00
gso.c net: introduce struct net_hotdata 2024-03-07 21:12:41 -08:00
hotdata.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
hwbm.c
ieee8021q_helpers.c net: ieee8021q: fix insufficient table-size assertion 2025-07-01 12:55:49 +02:00
link_watch.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
lock_debug.c net: document NETDEV_CHANGENAME as ops locked 2026-06-04 14:04:55 -07:00
lwt_bpf.c bpf: remove ipv6_bpf_stub completely and use direct function calls 2026-03-29 11:21:24 -07:00
lwtunnel.c inet: Remove rtnl_is_held arg of lwtunnel_valid_encap_type(_attr)?(). 2025-05-20 19:18:24 -07:00
Makefile net: get rid of net/core/request_sock.c 2026-02-05 09:23:05 -08:00
mp_dmabuf_devmem.h memory-provider: dmabuf devmem memory provider 2024-09-11 20:44:31 -07:00
neighbour.c neighbour: remove obsolete EXPORT_SYMBOL() 2026-06-08 15:59:17 -07:00
net_namespace.c Networking changes for 7.1. 2026-04-14 18:36:10 -07:00
net_test.c pfcp: always set pfcp metadata 2024-04-01 10:49:28 +01:00
net-procfs.c net: add proper RCU protection to /proc/net/ptype 2026-02-03 19:20:30 -08:00
net-sysfs.c rtnetlink: use dev_isalive() in rtnl_getlink() 2026-06-04 18:16:14 -07:00
net-sysfs.h net: add skb_defer_disable_key static key 2026-03-12 19:25:33 -07:00
net-traces.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
netclassid_cgroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
netdev_config.c net: add queue config validation callback 2026-01-23 11:49:02 -08:00
netdev_queues.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
netdev_rx_queue.c net: Rename ifq_idx to rxq_idx in netif_mp_* helpers 2026-04-12 09:12:07 -07:00
netdev-genl-gen.c net: devmem: allow bind-rx from non-init user namespaces 2026-06-05 18:10:31 -07:00
netdev-genl-gen.h net: Add queue-create operation 2026-04-09 18:21:45 -07:00
netdev-genl.c net: devmem: support TX over NETMEM_TX_NO_DMA devices 2026-05-18 18:49:06 -07:00
netevent.c
netmem_priv.h Revert "mm: introduce a new page type for page pool in page type" 2026-05-21 19:06:13 -07:00
netpoll.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-05-21 15:09:02 -07:00
netprio_cgroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
of_net.c net: Explicitly include correct DT includes 2023-07-27 20:33:16 -07:00
page_pool_priv.h net: page_pool: don't try to stash the napi id 2025-01-27 14:37:41 -08:00
page_pool_user.c net: make page_pool_get_stats() void 2026-05-28 18:10:03 -07:00
page_pool.c net: make page_pool_get_stats() void 2026-05-28 18:10:03 -07:00
pktgen.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
ptp_classifier.c
rtnetlink.c rtnetlink: use dev_isalive() in rtnl_getlink() 2026-06-04 18:16:14 -07:00
scm.c net: use ktime_t in struct scm_timestamping_internal 2026-03-04 17:53:34 -08:00
secure_seq.c tcp: secure_seq: add back ports to TS offset 2026-03-04 17:44:35 -08:00
selftests.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
skb_fault_injection.c net: Implement fault injection forcing skb reallocation 2024-11-12 12:05:33 +01:00
skbuff.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-06-01 13:42:12 +02:00
skmsg.c bpf, skmsg: fix verdict sk_data_ready racing with ktls rx 2026-05-20 17:21:21 -07:00
sock_diag.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
sock_map.c sockmap: Fix sk_psock_drop() race vs sock_map_{unhash,close,destroy}(). 2026-04-23 18:24:02 -07:00
sock_reuseport.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
sock.c net: ensure SCM_TXTIME delivery time is no older than system boot 2026-06-08 16:00:05 -07:00
stream.c net: stream: add description for sk_stream_write_space() 2025-07-18 16:57:21 -07:00
sysctl_net_core.c net: add skb_defer_disable_key static key 2026-03-12 19:25:33 -07:00
timestamping.c net: Add the possibility to support a selected hwtstamp in netdevice 2024-12-16 12:51:40 +00:00
tso.c net: tso: Introduce tso_dma_map and helpers 2026-04-12 10:54:31 -07:00
utils.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
xdp.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00