I am learning raw socket programming in linux Ubuntu but i have a problem. My udp packet is not shown in Wireshark. I suspect that its being dropped by my router because of a mistake I made.

here is my code.

#include<iostream>
#include<sys/ioctl.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<string.h>
#include<linux/ip.h>
#include<netdb.h>
#include<linux/udp.h>

struct pseudo_header {
    uint32_t source_address;
    uint32_t dest_address;
    uint8_t placeholder;
    uint8_t protocol;
    uint16_t udp_length;
};

uint16_t calc_checksum(void* data, int len) {
    uint16_t* ptr = (uint16_t*)data;
    uint32_t sum = 0;
    while (len > 1) {
        sum += *ptr++;
        len -= 2;
    }
    if (len == 1) {
        sum += *(uint8_t*)ptr;
    }
    while(sum >> 16)
    {
        sum += (sum & 0xFFFF) + (sum >> 16) ;
    }

    return ~sum;
}

int main()
{

    char sendbuff[28];
    memset(sendbuff,0,28);
    iphdr* ip_header = (iphdr*)sendbuff;
    udphdr* udp_header = (udphdr*)(sendbuff + sizeof(iphdr));
    pseudo_header psh;

    ip_header->version = 4;
    ip_header->ihl = 5;
    ip_header->id = htons(5234);
    ip_header->protocol = 17;
    ip_header->tos = 0;
    ip_header->tot_len = htons(28);
    ip_header->frag_off = 0;
    ip_header->ttl = 45;
    inet_pton(AF_INET,"192.168.8.144",&ip_header->saddr);
    inet_pton(AF_INET,"192.168.8.1",&ip_header->daddr);
    ip_header->check = 0;

    ip_header->check = calc_checksum(ip_header,sizeof(ip_header));

    char checksum_data[20];
    memset(checksum_data,0,20);

    udp_header->source = htons(1134);
    udp_header->dest = htons(12345);
    udp_header->len = 8;
    udp_header->check = 0;

    psh.dest_address = ip_header->daddr;
    psh.source_address = ip_header->saddr;
    psh.placeholder = 0;
    psh.udp_length = 8;
    psh.protocol = ip_header->protocol;

    memcpy(checksum_data,&psh,sizeof(pseudo_header));
    memcpy(checksum_data + sizeof(pseudo_header), udp_header,8);

    udp_header->check = calc_checksum(checksum_data,20);

    int s = socket(AF_INET,SOCK_RAW,IPPROTO_RAW);
    if(s == -1)
    {
        std::cout << "Could not open raw socket" << std::endl;
    }
    int optval = 1;

    if(setsockopt(s,IPPROTO_IP,IP_HDRINCL,&optval,sizeof(optval)) == -1)
    {
        std::cout << "Could not set socket option!" << std::endl;
    }
    sockaddr_in dstinfo;
    memset(&dstinfo,0,sizeof(dstinfo));
    dstinfo.sin_addr.s_addr = ip_header->daddr;
    dstinfo.sin_port = udp_header->dest;
    dstinfo.sin_family = AF_INET;


    if(sendto(s,sendbuff,28,0,(sockaddr*)&dstinfo,sizeof(dstinfo)) == -1)
    {
        std::cout << "Packet could not be sent!" << std::endl;
    }

}

I have ran my program as root I suspect their is something wrong with my checksum calculation of the ip header or udp header. Please help.