15c80b207c
In arp_update, check for FAILED or INCOMPLETE kernel neighbor entries and manually ping them to try and resolve the neighbor Signed-off-by: Lawrence Lee <lawlee@microsoft.com>
124 lines
5.5 KiB
Bash
Executable File
124 lines
5.5 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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ARP_UPDATE_VARS_FILE="/usr/share/sonic/templates/arp_update_vars.j2"
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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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ARP_UPDATE_VARS=$(sonic-cfggen -d -t ${ARP_UPDATE_VARS_FILE})
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SWITCH_TYPE=$(echo $ARP_UPDATE_VARS | jq -r '.switch_type')
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if [[ "$SWITCH_TYPE" == "chassis-packet" ]]; then
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STATIC_ROUTE_NEXTHOPS=$(echo $ARP_UPDATE_VARS | jq -r '.static_route_nexthops')
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# on supervisor/rp exit the script gracefully
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if [[ -z "$STATIC_ROUTE_NEXTHOPS" ]]; then
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logger "arp_update: exiting as no static route in packet based chassis"
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exit 0
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fi
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for nexthop in $STATIC_ROUTE_NEXTHOPS; do
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if [[ $nexthop == *"."* ]]; then
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neigh_state=( $(ip -4 neigh show | grep $nexthop | tr -s ' ' | cut -d ' ' -f 3,4) )
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ping_prefix=ping
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elif [[ $nexthop == *":"* ]] ; then
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neigh_state=( $(ip -6 neigh show | grep $nexthop | tr -s ' ' | cut -d ' ' -f 3,4) )
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ping_prefix=ping6
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fi
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if [[ "${neigh_state[1]}" == "INCOMPLETE" ]] || [[ "${neigh_state[1]}" == "FAILED" ]]; then
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pingcmd="timeout 0.2 $ping_prefix -I ${neigh_state[0]} -n -q -i 0 -c 1 -W 1 $nexthop >/dev/null"
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eval $pingcmd
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logger "arp_update: sttaic route nexthop not resolved, pinging $nexthop on ${neigh_state[0]}"
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fi
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done
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sleep 300
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continue
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fi
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# find L3 interfaces which are UP, send ipv6 multicast pings
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INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.interface')
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PC_INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.pc_interface')
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VLAN_SUB_INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.vlan_sub_interface')
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ALL_INTERFACE="$INTERFACE $PC_INTERFACE $VLAN_SUB_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 $ping6cmd
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fi
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done
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VLAN=$(echo $ARP_UPDATE_VARS | jq -r '.vlan')
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SUBTYPE=$(sonic-db-cli CONFIG_DB hget 'DEVICE_METADATA|localhost' 'subtype' | tr '[:upper:]' '[:lower:]')
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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="timeout 1 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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if [[ $SUBTYPE == "dualtor" ]]; then
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# on dual ToR devices, try to resolve failed neighbor entries since
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# these entries will have tunnel routes installed, preventing normal
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# neighbor resolution (SWSS PR #2137)
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# since ndisc6 is a userland process, the above ndisc6 commands are
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# insufficient to update the kernel neighbor table for failed entries
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# we don't need to do this for ipv4 neighbors since arping is able to
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# update the kernel neighbor table
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# generates the following command for each failed or incomplete IPv6 neighbor
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# timeout 0.2 ping <neighbor IPv6> -n -q -i 0 -c 1 -W 1 -I <VLAN name> >/dev/null
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ping6_template="sed -e 's/^/timeout 0.2 ping /' -e 's/,/ -n -q -i 0 -c 1 -W 1 -I /' -e 's/$/ >\/dev\/null;/'"
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failed_ip6_neigh_cmd="ip -6 neigh show | grep -v fe80 | grep $vlan | grep -E 'FAILED|INCOMPLETE' | cut -d ' ' -f 1,3 --output-delimiter=',' | $ping6_template"
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eval `eval $failed_ip6_neigh_cmd`
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fi
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done
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# sleep here before handling the mismatch as it is not required during startup
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sleep 300
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# refresh neighbor entries from APP_DB in case of mismatch with kernel
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DBNEIGH=$(sonic-db-cli APPL_DB keys 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 1 $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 1 $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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