74 lines
3.1 KiB
Bash
Executable File
74 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
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#
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# usage:
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# arp_update:
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# Send ipv6 multicast pings to all "UP" L3 interfaces including vlan interfaces to
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# refresh link-local addresses from neighbors.
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# Send gratuitous ARP/NDP requests to VLAN member neighbors to refresh
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# the ipv4/ipv6 neighbors state.
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while /bin/true; do
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# find L3 interfaces which are UP, send ipv6 multicast pings
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echo "{% for (name, prefix) in INTERFACE %} {{name}} {% endfor %}" > /tmp/intf_tmp.j2
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INTERFACE=`sonic-cfggen -d -t /tmp/intf_tmp.j2`
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echo "{% for (name, prefix) in PORTCHANNEL_INTERFACE %} {{name}} {% endfor %}" > /tmp/pc_intf_tmp.j2
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PC_INTERFACE=`sonic-cfggen -d -t /tmp/pc_intf_tmp.j2`
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ALL_INTERFACE="$INTERFACE $PC_INTERFACE"
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for intf in $ALL_INTERFACE; do
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ping6cmd="ping6 -I $intf -n -q -i 0 -c 1 -W 0 ff02::1 >/dev/null"
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intf_up=$(ip link show $intf | grep "state UP")
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if [[ -n "$intf_up" ]]; then
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eval $ping6cmd
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fi
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done
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VLAN=`sonic-cfggen -d -v 'VLAN.keys() | join(" ") if VLAN'`
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for vlan in $VLAN; do
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# generate a list of arping commands:
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# arping -q -w 0 -c 1 -i <VLAN interface> <IP 1>;
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# arping -q -w 0 -c 1 -i <VLAN interface> <IP 2>;
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# ...
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arpingcmd="sed -e 's/ / -i /' -e 's/^/arping -q -w 0 -c 1 /' -e 's/$/;/'"
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ipcmd="ip -4 neigh show | grep $vlan | cut -d ' ' -f 1,3 | $arpingcmd"
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eval `eval $ipcmd`
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# send ipv6 multicast pings to Vlan interfaces to get/refresh link-local addrs
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ping6cmd="ping6 -I $vlan -n -q -i 0 -c 1 -W 0 ff02::1 >/dev/null"
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eval $ping6cmd
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# generate a list of ndisc6 commands (exclude link-local addrs since it is done above):
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# ndisc6 -q -w 0 -1 <IP 1> <VLAN interface>;
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# ndisc6 -q -w 0 -1 <IP 2> <VLAN interface>;
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# ...
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ndisc6cmd="sed -e 's/^/ndisc6 -q -w 0 -1 /' -e 's/$/;/'"
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ip6cmd="ip -6 neigh show | grep -v fe80 | grep $vlan | cut -d ' ' -f 1,3 | $ndisc6cmd"
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eval `eval $ip6cmd`
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done
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# sleep here before handling the mismatch as it is not required during startup
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sleep 300
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# refresh neighbor entries from APP_DB in case of mismatch with kernel
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DBNEIGH=$(redis-cli -n 0 --scan --pattern NEIGH_TABLE*)
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KERNEIGH4=$(ip -4 neigh show | grep Vlan | cut -d ' ' -f 1,3 --output-delimiter=',')
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KERNEIGH6=$(ip -6 neigh show | grep -v fe80 | grep Vlan | cut -d ' ' -f 1,3 --output-delimiter=',')
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for neigh in $DBNEIGH; do
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intf="$( cut -d ':' -f 2 <<< "$neigh" )"
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ip="$( cut -d ':' -f 3- <<< "$neigh" )"
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if [[ $intf == *"Vlan"* ]]; then
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if [[ $ip == *"."* ]] && [[ ! $KERNEIGH4 =~ "${ip},${intf}" ]]; then
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pingcmd="timeout 0.2 ping -I $intf -n -q -i 0 -c 1 -W 0 $ip >/dev/null"
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eval $pingcmd
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logger "arp_update: mismatch arp entry, pinging ${ip} on ${intf}"
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elif [[ $ip == *":"* ]] && [[ ! $KERNEIGH6 =~ "${ip},${intf}" ]]; then
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ping6cmd="timeout 0.2 ping6 -I $intf -n -q -i 0 -c 1 -W 0 $ip >/dev/null"
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eval $ping6cmd
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logger "arp_update: mismatch v6 nbr entry, pinging ${ip} on ${intf}"
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fi
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fi
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done
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done
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