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net/neighbor: Support neighbor_out() for multiple link layer at the same time

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This commit is contained in:
Xiang Xiao
2018-11-09 14:21:49 -06:00
committed by Gregory Nutt
parent 0a6e234962
commit e294162697
6 changed files with 193 additions and 21 deletions
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include/nuttx/net/netdev.h
+6 -7
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@@ -554,24 +554,23 @@ int devif_timer(FAR struct net_driver_s *dev, devif_poll_callback_t callback);
* Description:
* This function should be called before sending out an IPv6 packet. The
* function checks the destination IPv6 address of the IPv6 packet to see
* what Ethernet MAC address that should be used as a destination MAC
* address on the Ethernet.
* what L2 address that should be used as a destination L2 address.
*
* If the destination IPv6 address is in the local network (determined
* by logical ANDing of netmask and our IPv6 address), the function
* checks the Neighbor Table to see if an entry for the destination IPv6
* address is found. If so, an Ethernet header is pre-pended at the
* beginning of the packet and the function returns.
* address is found. If so, an L2 header is pre-pended at the beginning
* of the packet and the function returns.
*
* If no Neighbor Table entry is found for the destination IPv6 address,
* the packet in the d_buf[] is replaced by an ICMPv6 Neighbor Solict
* the packet in the d_buf is replaced by an ICMPv6 Neighbor Solicit
* request packet for the IPv6 address. The IPv6 packet is dropped and
* it is assumed that the higher level protocols (e.g., TCP) eventually
* will retransmit the dropped packet.
*
* Upon return in either the case, a packet to be sent is present in the
* d_buf[] buffer and the d_len field holds the length of the Ethernet
* frame that should be transmitted.
* d_buf buffer and the d_len field holds the length of the L2 frame that
* should be transmitted.
*
****************************************************************************/