Parse error on ICMP (and probably other non IP protocols)

[tparsa]

{"level":"error","timestamp":"2021-12-05T14:45:02.006Z","caller":"drop/parser.go:78","msg":"Cannot parse the log line","log":"2021-12-05T14:44:59.341406+00:00 node-10 kernel: [2276706.763083] calico-packet: IN=calid2a5761e0a8 OUT=caliec92613fa1b MAC=ee:ee:ee:ee:ee:ee:96:a1:cb:af:30:69:08:00 SRC=10.2.118.254 DST=10.2.118.201 LEN=84 TOS=0x00 PREC=0x00 TTL=63 ID=6362 DF PROTO=ICMP TYPE=8 CODE=0 ID=92 SEQ=6 ","error":"Missing field=SPT","stacktrace":"github.com/box/kube-iptables-tailer/drop.RunParsing\n\t/go/src/github.com/box/kube-iptables-tailer/drop/parser.go:78\nmain.startParsing\n\t/go/src/github.com/box/kube-iptables-tailer/main.go:95"}

Hello,
As provided by log in this line and this line the parser tries to get SPT DPT from log which is not available in non IP protocols. Which leads to no metrics and no events.