* [PATCH net v4 0/2] packet: use consistent hard_header_len in send paths
@ 2026-07-29 3:00 Qihang
0 siblings, 0 replies; 2+ messages in thread
From: Qihang @ 2026-07-29 3:00 UTC (permalink / raw)
To: netdev
Cc: willemdebruijn.kernel, daniel.zahka, davem, edumazet, kuba,
pabeni, horms, stable, Qihang
AF_PACKET send paths read dev->hard_header_len at several stages of skb
allocation and construction. Concurrent netdevice reconfiguration can
make those reads inconsistent and cause skb headroom underflow.
Split the regular and TX_RING paths so each patch has one Fixes tag.
The separate SOCK_DGRAM consistency issue between hard_header_len and
header_ops->create remains outside this series.
Changes in v4:
- Use one hard_header_len snapshot throughout tpacket_snd(), including
reserve and per-frame skb construction.
- Carry Willem's Reviewed-by on patch 1.
Link to v3: https://lore.kernel.org/netdev/20260728031345.49562-1-q.h.hack.winter@gmail.com/
Qihang (2):
packet: use consistent hard_header_len in non-ring send paths
packet: use consistent hard_header_len in TX_RING send path
include/linux/netdevice.h | 6 +++--
net/packet/af_packet.c | 46 ++++++++++++++++++++++++---------------
2 files changed, 32 insertions(+), 20 deletions(-)
--
2.50.1 (Apple Git-155)
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH net v4 0/2] packet: use consistent hard_header_len in send paths
@ 2026-07-29 3:01 Qihang
0 siblings, 0 replies; 2+ messages in thread
From: Qihang @ 2026-07-29 3:01 UTC (permalink / raw)
To: netdev
Cc: willemdebruijn.kernel, daniel.zahka, davem, edumazet, kuba,
pabeni, horms, stable, Qihang
AF_PACKET send paths read dev->hard_header_len at several stages of skb
allocation and construction. Concurrent netdevice reconfiguration can
make those reads inconsistent and cause skb headroom underflow.
Split the regular and TX_RING paths so each patch has one Fixes tag.
The separate SOCK_DGRAM consistency issue between hard_header_len and
header_ops->create remains outside this series.
Changes in v4:
- Use one hard_header_len snapshot throughout tpacket_snd(), including
reserve and per-frame skb construction.
- Carry Willem's Reviewed-by on patch 1.
Link to v3: https://lore.kernel.org/netdev/20260728031345.49562-1-q.h.hack.winter@gmail.com/
Qihang (2):
packet: use consistent hard_header_len in non-ring send paths
packet: use consistent hard_header_len in TX_RING send path
include/linux/netdevice.h | 6 +++--
net/packet/af_packet.c | 46 ++++++++++++++++++++++++---------------
2 files changed, 32 insertions(+), 20 deletions(-)
--
2.50.1 (Apple Git-155)
^ permalink raw reply [flat|nested] 2+ messages in thread
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