--- /dev/null
+diff -ruNp iproute2-4.14.1.orig/ip/ipfou.c iproute2-4.14.1/ip/ipfou.c
+--- iproute2-4.14.1.orig/ip/ipfou.c 2017-11-13 19:09:57.000000000 +0100
++++ iproute2-4.14.1/ip/ipfou.c 2018-02-19 15:49:27.105945493 +0100
+@@ -28,6 +28,7 @@ static void usage(void)
+ fprintf(stderr, "Usage: ip fou add port PORT "
+ "{ ipproto PROTO | gue } [ -6 ]\n");
+ fprintf(stderr, " ip fou del port PORT [ -6 ]\n");
++ fprintf(stderr, " ip fou show\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, "Where: PROTO { ipproto-name | 1..255 }\n");
+ fprintf(stderr, " PORT { 1..65535 }\n");
+@@ -134,6 +135,63 @@ static int do_del(int argc, char **argv)
+ return 0;
+ }
+
++static int print_fou_mapping(const struct sockaddr_nl *who,
++ struct nlmsghdr *n, void *arg)
++{
++ FILE *fp = (FILE *)arg;
++ struct genlmsghdr *ghdr;
++ struct rtattr *tb[FOU_ATTR_MAX + 1];
++ int len = n->nlmsg_len;
++ unsigned family;
++
++ if (n->nlmsg_type != genl_family)
++ return 0;
++
++ len -= NLMSG_LENGTH(GENL_HDRLEN);
++ if (len < 0)
++ return -1;
++
++ ghdr = NLMSG_DATA(n);
++ parse_rtattr(tb, FOU_ATTR_MAX, (void *) ghdr + GENL_HDRLEN, len);
++
++ if (tb[FOU_ATTR_PORT])
++ fprintf(fp, "port %u", ntohs(rta_getattr_u16(tb[FOU_ATTR_PORT])));
++ if (tb[FOU_ATTR_TYPE] && rta_getattr_u8(tb[FOU_ATTR_TYPE]) == FOU_ENCAP_GUE)
++ fprintf(fp, " gue");
++ else if (tb[FOU_ATTR_IPPROTO])
++ fprintf(fp, " ipproto %u", rta_getattr_u8(tb[FOU_ATTR_IPPROTO]));
++ if (tb[FOU_ATTR_AF]) {
++ family = rta_getattr_u8(tb[FOU_ATTR_AF]);
++ if (family == AF_INET6)
++ fprintf(fp, " -6");
++ }
++ fprintf(fp, "\n");
++
++ return 0;
++}
++
++static int do_show(int argc, char **argv)
++{
++ FOU_REQUEST(req, 4096, FOU_CMD_GET, NLM_F_REQUEST | NLM_F_DUMP);
++
++ if (argc > 0) {
++ fprintf(stderr, "\"ip fou show\" does not take any arguments.\n");
++ return -1;
++ }
++
++ if (rtnl_send(&genl_rth, &req.n, req.n.nlmsg_len) < 0) {
++ perror("Cannot send show request");
++ exit(1);
++ }
++
++ if (rtnl_dump_filter(&genl_rth, print_fou_mapping, stdout) < 0) {
++ fprintf(stderr, "Dump terminated\n");
++ return 1;
++ }
++
++ return 0;
++}
++
+ int do_ipfou(int argc, char **argv)
+ {
+ if (argc < 1)
+@@ -149,6 +207,8 @@ int do_ipfou(int argc, char **argv)
+ return do_add(argc-1, argv+1);
+ if (matches(*argv, "delete") == 0)
+ return do_del(argc-1, argv+1);
++ if (matches(*argv, "show") == 0)
++ return do_show(argc-1, argv+1);
+ fprintf(stderr, "Command \"%s\" is unknown, try \"ip fou help\".\n", *argv);
+ exit(-1);
+ }
+diff -ruNp iproute2-4.14.1.orig/man/man8/ip-fou.8 iproute2-4.14.1/man/man8/ip-fou.8
+--- iproute2-4.14.1.orig/man/man8/ip-fou.8 2017-11-13 19:09:57.000000000 +0100
++++ iproute2-4.14.1/man/man8/ip-fou.8 2018-02-19 15:49:23.558962613 +0100
+@@ -29,6 +29,9 @@ ip-gue \- Generic UDP Encapsulation rece
+ .BR "ip fou del"
+ .B port
+ .IR PORT
++.br
++.ti -8
++.B ip fou show
+ .SH DESCRIPTION
+ The
+ .B ip fou