unix: add ICMP_FILTER constant on linux

Change-Id: I9ce0932c28ae8634270d69b0bd23216e963cc105
Reviewed-on: https://go-review.googlesource.com/c/sys/+/303369
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/mkerrors.sh

@@ -216,6 +216,7 @@ struct ltchars {
 #include <linux/genetlink.h>
 #include <linux/hdreg.h>
 #include <linux/hidraw.h>
+#include <linux/icmp.h>
 #include <linux/icmpv6.h>
 #include <linux/if.h>
 #include <linux/if_addr.h>
@@ -500,7 +501,7 @@ ccflags="$@"
 		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|ICMP6|TCP|MCAST|EVFILT|NOTE|SHUT|PROT|MAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR|LOCAL)_/ ||
 		$2 ~ /^TP_STATUS_/ ||
 		$2 ~ /^FALLOC_/ ||
-		$2 == "ICMPV6_FILTER" ||
+		$2 ~ /^ICMP(V6)?_FILTER$/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 == "IFNAMSIZ" ||

unix/zerrors_linux.go

@@ -974,6 +974,7 @@ const (
 	HUGETLBFS_MAGIC                             = 0x958458f6
 	IBSHIFT                                     = 0x10
 	ICMPV6_FILTER                               = 0x1
+	ICMP_FILTER                                 = 0x1
 	ICRNL                                       = 0x100
 	IFA_F_DADFAILED                             = 0x8
 	IFA_F_DEPRECATED                            = 0x20