Drop skb or expand outgoing skb

When I grab an outgoing package in the kernel using a kernel module, I use kfree_skb () to remove that package, but it doesn't work and the package reaches its destination. I check & skb-> user is 1.

change_skb (struct sk_buff * skb) gets the original skb and creates a new seperate copy (just copy its payload) and upload the new skb. This works, I can see my new packet from the receiver side, but I cannot get rid of the original so that I can still see the original on the receiver side.

Here is my code:

int my_pkt_handling(struct sk_buff *skb, struct net_device *dev, struct packet_type *pkt, struct net_device *org_dev) {

struct ethhdr *eth = eth_hdr(skb);
struct iphdr *iph = ip_hdr(skb);
unsigned char dst_addr[] = {0x00, 0x16, 0x41, 0xaa, 0xf8, 0xf0};
unsigned char src_addr[] = {0x00, 0x1f, 0xe2, 0x12, 0xb0, 0x34};

switch (skb->pkt_type) {
    case PACKET_OUTGOING:
        if ( memcmp(eth->h_dest, dst_addr, ETH_ALEN) == 0 && eth->h_proto == htons(ETH_P_IP) ) {                
            printk(KERN_ALERT"Outgoing| Interface: %4s Type: 0x%4x Src: %pI4 Dest: %pI4 Len: %d SizeOf: %lu User#: %d\n", 
                        skb->dev->name, ntohs(eth->h_proto), &iph->saddr, &iph->daddr, skb->len, sizeof(skb), atomic_read(&skb->users));
            change_skb(skb);
            kfree_skb(skb);
            return 0;
        }
        break;
    default:
        break;
}

return 0;