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wangchen 2e6d0815b2 nuttx/net:Support to PMTUD 
RFC 1191
When a router is unable to forward a datagram because it exceeds the
   MTU of the next-hop network and its Don't Fragment bit is set, the
   router is required to return an ICMP Destination Unreachable message
   to the source of the datagram, with the Code indicating
   "fragmentation needed and DF set".  To support the Path MTU Discovery
   technique specified in this memo, the router MUST include the MTU of
   that next-hop network in the low-order 16 bits of the ICMP header
   field that is labelled "unused" in the ICMP specification [7].  The
   high-order 16 bits remain unused, and MUST be set to zero.  Thus, the
   message has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   Type = 3    |   Code = 4    |           Checksum            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |           unused = 0          |         Next-Hop MTU          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |      Internet Header + 64 bits of Original Datagram Data      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
RFC 1185
Packet Too Big Message

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     Type      |     Code      |          Checksum             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                             MTU                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    As much of invoking packet                 |
      +               as will fit without the ICMPv6 packet           +
      |                       exceeding 576 octets                    |

   IPv6 Fields:

   Destination Address

                  Copied from the Source Address field of the invoking
                  packet.

   ICMPv6 Fields:

   Type           2

   Code           0

   MTU            The Maximum Transmission Unit of the next-hop link.

   Description

   A Packet Too Big MUST be sent by a router in response to a packet
   that it cannot forward because the packet is larger than the MTU of
   the outgoing link.  The information in this message is used as part
   of the Path MTU Discovery process [RFC-1191].

Signed-off-by: wangchen <wangchen41@xiaomi.com>
 		2023-05-12 10:21:52 -03:00
..
Make.defs net/sendfile: adapt sendfile() to support new driver model 2023-02-14 11:21:09 +08:00
devif.h nuttx/net:Support to PMTUD 2023-05-12 10:21:52 -03:00
devif_callback.c Improvements in sockets allocation. 2023-02-20 09:06:46 +08:00
devif_filesend.c net/devif: fix null pointer reference found out by coverity 2023-02-21 00:44:07 +08:00
devif_forward.c net/ipfwd: fix `devif_forward` after IOB offload. 2022-12-06 17:03:47 +08:00
devif_initialize.c tcp: Remove incomplete support for TCP reassembly 2020-12-09 07:25:26 -08:00
devif_iobsend.c net/devif: check the net device before use 2023-01-31 18:41:50 +08:00
devif_loopback.c Support fragmentation and reassembly 2023-01-17 14:01:37 +08:00
devif_poll.c nuttx/net:Support to PMTUD 2023-05-12 10:21:52 -03:00
devif_send.c net/devif: correct the judgment condition in devif_send() 2023-01-31 22:42:58 +08:00
ipv4_input.c net/netdev: Avoid hardcoded guardsize when using d_iob 2023-01-18 14:41:07 +08:00
ipv6_input.c net/ip: fix compile break if disable NET_TCP 2023-02-07 12:46:40 +02:00