chao.an 9bdeed73e2 net/tcp: fix assertion of fallback connection alloc
When the free connection list is unenough to alloc a new instance,
the TCP stack will reuse the currently closed connection, but if
the handle is not released by the user via close(2), the reference
count of the connection remains in a non-zero value, it will cause
the assertion to fail, so when the handle is not released we should
not use such a conn instance when being actively closed, and ensure
that the reference count is assigned within the net lock protection

|(gdb) bt
|#0  up_assert (filename=0x565c78f7 "tcp/tcp_conn.c", lineno=771) at sim/up_assert.c:75
|#1  0x56566177 in _assert (filename=0x565c78f7 "tcp/tcp_conn.c", linenum=771) at assert/lib_assert.c:36
|#2  0x5657d620 in tcp_free (conn=0x565fb3e0 <g_tcp_connections>) at tcp/tcp_conn.c:771
|#3  0x5657d5a1 in tcp_alloc (domain=2 '\002') at tcp/tcp_conn.c:700
|#4  0x565b1f50 in inet_tcp_alloc (psock=0xf3dea150) at inet/inet_sockif.c:144
|#5  0x565b2082 in inet_setup (psock=0xf3dea150, protocol=0) at inet/inet_sockif.c:253
|#6  0x565b1bf0 in psock_socket (domain=2, type=1, protocol=0, psock=0xf3dea150) at socket/socket.c:121
|#7  0x56588f5f in socket (domain=2, type=1, protocol=0) at socket/socket.c:278
|#8  0x565b11c0 in hello_main (argc=1, argv=0xf3dfab10) at hello_main.c:35
|#9  0x56566631 in nxtask_startup (entrypt=0x565b10ef <hello_main>, argc=1, argv=0xf3dfab10) at sched/task_startup.c:70
|#10 0x565597fa in nxtask_start () at task/task_start.c:134

Signed-off-by: chao.an <anchao@xiaomi.com>
2022-07-09 09:37:49 +09:00
..
2022-06-07 20:15:41 +03:00
2022-03-12 19:24:17 +02:00
2022-04-03 14:37:53 +03:00

README
======

Directory Structure
===================

  nuttx/
   |
   `- net/
       |
       +- arp        - Address resolution protocol (IPv4)
       +- bluetooth  - PF_BLUETOOTH socket interface
       +- devif      - Stack/device interface layer
       +- icmp       - Internet Control Message Protocol (IPv4)
       +- icmpv6     - Internet Control Message Protocol (IPv6)
       +- ieee802154 - PF_IEEE802154 socket interface
       +- inet       - PF_INET/PF_INET6 socket interface
       +- ipforward  - IP forwarding logic
       +- local      - Unix domain (local) sockets
       +- mld        - Multicast Listener Discovery (MLD)
       +- neighbor   - Neighbor Discovery Protocol (IPv6)
       +- netdev     - Socket network device interface
       +- netlink    - Netlink IPC socket interface
       +- pkt        - "Raw" packet socket support
       +- sixlowpan  - 6LoWPAN implementation
       +- socket     - BSD socket interface
       +- route      - Routing table support
       +- tcp        - Transmission Control Protocol
       +- udp        - User Datagram Protocol
       +- usrsock    - User socket API for user-space networking stack
       `- utils      - Miscellaneous utility functions

    +-------------------------------------------------------------------++------------------------+
    |                     Application layer                             || usrsock daemon         |
    +-------------------------------------------------------------------++------------------------+
    +-------------------------------------------------------------------++----------------+ +-----+
    |                   Socket layer (socket/)                          || /dev/usrsock   | |     |
    +-------------------------------------------------------------------++----------------+ |     |
    +------------++--------------------------------------------------++-------------------+ |     |
    |  Network   || Protocol stacks (arp, ipv6, icmp, pkt, tcp, udp) || usrsock/          | |     |
    |   Device   |+--------------------------------------------------++-------------------+ |     |
    | Interface  |+------------------------------------++---------------------------------+ |     |
    | (netdev/)  ||  Network Device Interface (devif/) || Utilities                       | |     |
    +------------++------------------------------------++---------------------------------+ |     |
    +----------------------------------------------------------------+                      |     |
    |                    Network Device Drivers                      |                      | HAL |
    +----------------------------------------------------------------+                      +-----+
    +----------------------------------------------------------------+ +--------------------------+
    |                    Networking Hardware                         | |  Hardware TCP/IP Stack   |
    +----------------------------------------------------------------+ +--------------------------+