[PATCH] net: fix GTP packet parsing

[Jie Hai]

Good job!

Acked-by: Jie Hai <haijie1 at huawei.com>

On 2025/4/11 16:43, Dengdui Huang wrote:
> After parsing the GTP packet header, the next protocol type should
> be converted from RTE_GTP_TYPE_IPV4/IPV6 to RTE_ETHER_TYPE_IPV4/IPV6.
> Otherwise, the next protocol cannot be parsed.
> 
> Fixes: 64ed7f854cf4 ("net: add tunnel packet type parsing")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Dengdui Huang <huangdengdui at huawei.com>
> ---
>   lib/net/rte_net.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/net/rte_net.c b/lib/net/rte_net.c
> index be24690fdf..1771588a09 100644
> --- a/lib/net/rte_net.c
> +++ b/lib/net/rte_net.c
> @@ -231,7 +231,13 @@ ptype_tunnel_with_udp(uint16_t *proto, const struct rte_mbuf *m,
>   		 */
>   		if (gh->msg_type == 0xff) {
>   			ip_ver = *(const uint8_t *)((const char *)gh + gtp_len);
> -			*proto = (ip_ver) & 0xf0;
> +			ip_ver = (ip_ver) & 0xf0;
> +			if (ip_ver == RTE_GTP_TYPE_IPV4)
> +				*proto = rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4);
> +			else if (ip_ver == RTE_GTP_TYPE_IPV6)
> +				*proto = rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV6);
> +			else
> +				*proto = 0;
>   		} else {
>   			*proto = 0;
>   		}