fix

.Module.symvers.cmd

@@ -0,0 +1 @@
+savedcmd_Module.symvers :=  /usr/lib/modules/7.1.3-arch1-1/build/scripts/mod/modpost -M    -a    -N  -o Module.symvers -n -T modules.order -i /usr/lib/modules/7.1.3-arch1-1/build/Module.symvers -e 

.etherip6.ko.cmd

@@ -0,0 +1 @@
+savedcmd_etherip6.ko := ld -r -m elf_x86_64 -z noexecstack --no-warn-rwx-segments --build-id=sha1  -T /usr/lib/modules/7.1.3-arch1-1/build/scripts/module.lds -o etherip6.ko etherip6.o etherip6.mod.o .module-common.o

.etherip6.mod.cmd

@@ -0,0 +1 @@
+savedcmd_etherip6.mod := printf '%s\n'   etherip6.o | awk '!x[$$0]++ { print("./"$$0) }' > etherip6.mod

.modules.order.cmd

@@ -0,0 +1 @@
+savedcmd_modules.order := {   echo etherip6.o; :; } > modules.order

etherip6.c

@@ -15,6 +15,7 @@
 #include <linux/rculist.h>
 #include <linux/rtnetlink.h>
 #include <linux/skbuff.h>
+#include <linux/tcp.h>
 #include <net/ip.h>
 #include <net/ip6_route.h>
 #include <net/ipv6.h>
@@ -157,8 +158,22 @@ static netdev_tx_t etherip6_xmit(struct sk_buff *skb, struct net_device *dev)
 	int headroom;
 	int err;
 	struct sk_buff *segs, *next;
+	unsigned int gso_limit;
 
 	if (skb_is_gso(skb)) {
+		/*
+		 * GSO is performed before EtherIP/IPv6 encapsulation.  Limit the
+		 * TCP payload according to the configured inner MTU; this preserves
+		 * both 1500-byte and jumbo-frame tunnel configurations.
+		 */
+		gso_limit = max_t(unsigned int, dev->mtu,
+			ETH_HLEN + ETHERIP6_HLEN + sizeof(struct ipv6hdr) +
+			sizeof(struct tcphdr)) - ETH_HLEN - ETHERIP6_HLEN -
+			(skb->protocol == htons(ETH_P_IPV6) ?
+			 sizeof(struct ipv6hdr) : sizeof(struct iphdr)) -
+			 sizeof(struct tcphdr);
+		if (skb_shinfo(skb)->gso_size > gso_limit)
+			skb_shinfo(skb)->gso_size = gso_limit;
 		segs = skb_gso_segment(skb, 0);
 		if (IS_ERR(segs))
 			goto tx_error;

etherip6.mod

@@ -0,0 +1 @@
+./etherip6.o

etherip6.mod.c

@@ -0,0 +1,21 @@
+#include <linux/module.h>
+#include <linux/export-internal.h>
+#include <linux/compiler.h>
+
+MODULE_INFO(name, KBUILD_MODNAME);
+
+__visible struct module __this_module
+__section(".gnu.linkonce.this_module") = {
+	.name = KBUILD_MODNAME,
+	.init = init_module,
+#ifdef CONFIG_MODULE_UNLOAD
+	.exit = cleanup_module,
+#endif
+	.arch = MODULE_ARCH_INIT,
+};
+
+
+MODULE_INFO(depends, "");
+
+
+MODULE_INFO(srcversion, "4BA7F5574A683C00B097C2C");

modules.order

@@ -0,0 +1 @@
+etherip6.o