Address comment

Signed-off-by: Zhonghu Xu <xuzhonghu@huawei.com>

Author: hzxuzhonghu

bpf/include/bpf_common.h

@@ -262,15 +262,13 @@ static inline void remove_kmesh_managed_ip(__u32 family, __u32 ip4, __u32 *ip6)
 
 static inline bool sock_conn_from_sim(struct __sk_buff *skb)
 {
-    __u16 enable_port = ENABLE_KMESH_PORT;
-    __u16 disable_port = DISABLE_KMESH_PORT;
     __u16 dst_port = (__u16)(skb->remote_port >> 16);
-    if (bpf_ntohs(dst_port) != enable_port && bpf_ntohs(dst_port) != disable_port)
+    if (bpf_ntohs(dst_port) != ENABLE_KMESH_PORT && bpf_ntohs(dst_port) != DISABLE_KMESH_PORT)
         return false;
 
     if (skb->protocol == AF_INET)
         return bpf_ntohl(skb->remote_ip4) == CONTROL_CMD_IP;
-    // If directly read skb->remote_ip6. bpf prog load failed
+    // If directly read skb->remote_ip6. bpf prog load would fail with permission denied.
     __u32 remote_ip6[4] = {0};
     bpf_skb_load_bytes(skb, offsetof(struct __sk_buff, remote_ip6), &remote_ip6, sizeof(remote_ip6));
     return (