[ovs-dev] [PATCH] Revert "ip_gre: Remove even more unused code"

[Gregory Rose]

On 11/1/2019 9:07 AM, Greg Rose wrote:
> This reverts commit 42a059e02bf343787951be2824c579e1c9a26e12.
>
> Not all the necessary ipgre prefixed code was removed that
> should have been.  Another patch will follow with the correct
> removed code.
>
> Signed-off-by: Greg Rose <gvrose8192 at gmail.com>
> ---

Maintainers, please apply this revert patch to fix the Travis builds.  
Patch passes Travis here:

https://travis-ci.org/gvrose8192/ovs-experimental/builds/606080092

Thanks,

- Greg

>   datapath/linux/compat/ip_gre.c | 38 ++++++++++++++++++++++++++++++++++++++
>   1 file changed, 38 insertions(+)
>
> diff --git a/datapath/linux/compat/ip_gre.c b/datapath/linux/compat/ip_gre.c
> index 8536241..3b7e607 100644
> --- a/datapath/linux/compat/ip_gre.c
> +++ b/datapath/linux/compat/ip_gre.c
> @@ -922,6 +922,44 @@ static int erspan_tunnel_init(struct net_device *dev)
>   	return ip_tunnel_init(dev);
>   }
>   
> +static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
> +			unsigned short type,
> +			const void *daddr, const void *saddr, unsigned int len)
> +{
> +	struct ip_tunnel *t = netdev_priv(dev);
> +	struct iphdr *iph;
> +	struct gre_base_hdr *greh;
> +
> +	iph = (struct iphdr *)__skb_push(skb, t->hlen + sizeof(*iph));
> +	greh = (struct gre_base_hdr *)(iph+1);
> +	greh->flags = gre_tnl_flags_to_gre_flags(t->parms.o_flags);
> +	greh->protocol = htons(type);
> +
> +	memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
> +
> +	/* Set the source hardware address. */
> +	if (saddr)
> +		memcpy(&iph->saddr, saddr, 4);
> +	if (daddr)
> +		memcpy(&iph->daddr, daddr, 4);
> +	if (iph->daddr)
> +		return t->hlen + sizeof(*iph);
> +
> +	return -(t->hlen + sizeof(*iph));
> +}
> +
> +static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
> +{
> +	const struct iphdr *iph = (const struct iphdr *) skb_mac_header(skb);
> +	memcpy(haddr, &iph->saddr, 4);
> +	return 4;
> +}
> +
> +static const struct header_ops ipgre_header_ops = {
> +	.create	= ipgre_header,
> +	.parse	= ipgre_header_parse,
> +};
> +
>   static int ipgre_tunnel_init(struct net_device *dev)
>   {
>   	struct ip_tunnel *tunnel = netdev_priv(dev);