ARP: should drop any packet pended when timeout #8019
Description
Zephyr send ARP packet first before ICMP if the ip address doesn't cached in ip tables, always pended the ICMP packet and resend pended ICMP packet when it got ARP reply.
But if the ARP packet doesn't have a reply because host doesn't exist, zephyr will always hold on the ICMP packet pended, doesn't free !
There always has a ARP item in arp tables associate that ip address but mac address is zero even if that ARP packet doesn't has a reply.
Next is the log from zephyr's console shell, I try ping some nonexistent hosts:
net> ping 192.168.3.10
Sent a ping to 192.168.3.10
Ping timeout
net> arp
Interface Link Address
[ 0] 0x2000dd60 00:00:00:00:00:00 192.168.3.10
net> mem
Fragment length 128 bytes
Network buffer pools:
Address Total Avail Name
0x2000dc5c 32 32 RX
0x2000dc78 32 31 TX
0x2000dcf4 32 32 RX DATA (rx_bufs)
0x2000dd1c 32 31 TX DATA (tx_bufs)
net> ping 192.168.3.11
Sent a ping to 192.168.3.11
Ping timeout
net> arp
Interface Link Address
[ 0] 0x2000dd60 00:00:00:00:00:00 192.168.3.10
[ 1] 0x2000dd60 00:00:00:00:00:00 192.168.3.11
net> mem
Fragment length 128 bytes
Network buffer pools:
Address Total Avail Name
0x2000dc5c 32 32 RX
0x2000dc78 32 30 TX
0x2000dcf4 32 32 RX DATA (rx_bufs)
0x2000dd1c 32 30 TX DATA (tx_bufs)
net> ping 192.168.3.12
Sent a ping to 192.168.3.12
Ping timeout
net> arp
Interface Link Address
[ 0] 0x2000dd60 00:00:00:00:00:00 192.168.3.10
[ 1] 0x2000dd60 00:00:00:00:00:00 192.168.3.11
[ 2] 0x2000dd60 00:00:00:00:00:00 192.168.3.12
net> mem
Fragment length 128 bytes
Network buffer pools:
Address Total Avail Name
0x2000dc5c 32 32 RX
0x2000dc78 32 29 TX
0x2000dcf4 32 32 RX DATA (rx_bufs)
0x2000dd1c 32 29 TX DATA (tx_bufs)
net> ping 192.168.3.13
Sent a ping to 192.168.3.13
Ping timeout
net> arp
Interface Link Address
[ 0] 0x2000dd60 00:00:00:00:00:00 192.168.3.10
[ 1] 0x2000dd60 00:00:00:00:00:00 192.168.3.11
[ 2] 0x2000dd60 00:00:00:00:00:00 192.168.3.12
[ 3] 0x2000dd60 00:00:00:00:00:00 192.168.3.13
net> mem
Fragment length 128 bytes
Network buffer pools:
Address Total Avail Name
0x2000dc5c 32 32 RX
0x2000dc78 32 28 TX
0x2000dcf4 32 32 RX DATA (rx_bufs)
0x2000dd1c 32 28 TX DATA (tx_bufs)
net> ping 192.168.3.14
Sent a ping to 192.168.3.14
Ping timeout
net> arp
Interface Link Address
[ 0] 0x2000dd60 00:00:00:00:00:00 192.168.3.10
[ 1] 0x2000dd60 00:00:00:00:00:00 192.168.3.11
[ 2] 0x2000dd60 00:00:00:00:00:00 192.168.3.12
[ 3] 0x2000dd60 00:00:00:00:00:00 192.168.3.13
[ 4] 0x2000dd60 00:00:00:00:00:00 192.168.3.14
net> mem
Fragment length 128 bytes
Network buffer pools:
Address Total Avail Name
0x2000dc5c 32 32 RX
0x2000dc78 32 27 TX
0x2000dcf4 32 32 RX DATA (rx_bufs)
0x2000dd1c 32 27 TX DATA (tx_bufs)
net>
There should resolve those problem:
- do NOT occupy one item in arp tables if that ARP doesn't has a reply
- free net packet pended before when ARP timeout