zhhyu7 opened a new pull request, #21517:
URL: https://github.com/apache/nuttx/pull/21517
## Summary
A series of improvements and fixes for the `AF_PACKET` (raw packet)
socket implementation in `net/pkt`: receive-size limiting, multi-socket
delivery for sockets bound to the same protocol, source-address
reporting on `recvfrom()`, a read-back mechanism, a loopback packet-loss
fix, a send-path deadlock fix, and raw packet support over the TUN
driver.
The series (7 commits, oldest to newest):
1. **net/pkt: add recv size limit when NET_RECV_BUFSIZE > 0** — enforces
the per-socket receive buffer limit (`SO_RCVBUF` /
`CONFIG_NET_RECV_BUFSIZE`) when queuing received packets.
2. **net/pkt: deliver data into multiple pkt conn bound to same
protocol** — when several packet sockets are bound to the same
protocol, deliver the received frame to each of them instead of only
one connection.
3. **net/pkt: add the sender's address information with recvfrom** —
fills in the source link-layer address so `recvfrom()` returns the
sender information, standardizing the receive path.
4. **net/pkt: config pkt socket read back mechanism** — adds a read-back
mechanism for packet sockets (new fields in `include/nuttx/net/pkt.h`
and `net/pkt`, with a small `netdev_upperhalf` adjustment) so locally
transmitted frames can be observed by the socket as configured.
5. **net/pkt: fix issue for pkt loopback** — the stack did not clear
`conn->pendiob` after sending; if that IOB was reused when receiving
from the lowerhalf, the frame was dropped, causing packet loss. Adds a
guard condition to avoid the drop.
6. **net/pkt: fix dead lock issue and optimize performance** — minimizes
the lock/unlock window on the buffered send path: it first tries to
acquire resources, and only when acquisition fails in blocking mode
does it unlock before waiting, avoiding a deadlock.
7. **pkt: support raw pkt in tun driver** — enables raw packet sockets
over the TUN driver and fixes a related code-logic error.
## Impact
- New/changed public interface in `include/nuttx/net/pkt.h` (read-back
mechanism, commit 4).
- Minor change to `drivers/net/netdev_upperhalf.c` to support read-back.
- Behavioral change: frames are now delivered to all packet sockets
bound to the same protocol (commit 2), and loopback frames are no
longer dropped (commit 5).
- No change to non-packet socket families.
## Testing
TODO:
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