大家看看,下面是我自己封装的IPV6 UDP报文的头,为什么用发不出去,udp在ipv6下checksum怎么填?与chcksum有关吗?

[码农wuhb]

struct libnet_in6_addr
{
union
{
u_char __u6_addr8[16];
u_short __u6_addr16[8];
u_int __u6_addr32[4];
} __u6_addr; /* 128-bit IP6 address */
};

struct libnet_ipv6_hdr
{
u_char ip_flags[4]; /* version, traffic class, flow label */
u_short ip_len; /* total length */
u_char ip_nh; /* next header */
u_char ip_hl; /* hop limit */
struct libnet_in6_addr ip_src, ip_dst; /* source and dest address */
};

BYTE abData[MAX_BUFF_LEN_M];
WORD wTotolLen = 0;

ZeroMemory(abData, MAX_BUFF_LEN_M);

//R6报文暂时不存在分片
if (wLen+ETHER_LENGTH+IP6_HDR_LEN_M+UDP_LENGTH> 1500 )
{
MessageBox(NULL,"目前不支持UDP分片,报文过大!", "waring", MB_OK);
return FALSE;
}

struct udp_header *ptUdpHdr = (udp_header*)(abData + ETHER_LENGTH + IP6_HDR_LEN_M);
ptUdpHdr->sport = htons(wSrcPort);
ptUdpHdr->dport = htons(wDstPort);
ptUdpHdr->len = htons(wLen + UDP_LENGTH);//udp_length = 8
ptUdpHdr->crc = 0xffff;

struct eth_header *ptEtHdr = (eth_header*)abData;
ptEtHdr->type = htons(ETH_IP6);//eth_ip6=0x86dd
memcpy(ptEtHdr->smac, s_abSelfMac, 6);
memcpy(ptEtHdr->dmac, s_abDesMac, 6);

//IP头
struct libnet_ipv6_hdr *ip6_hdr = (libnet_ipv6_hdr *) (abData + ETHER_LENGTH); //ether_lenth = 14

ip6_hdr->ip_src.__u6_addr.__u6_addr8[0] = (u_char)0xfe80;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[1] = (u_char)0;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[2] = (u_char)0;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[3] = (u_char)0;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[4] = (u_char)0x217;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[5] = (u_char)0x31ff;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[6] = (u_char)0xfe50;
ip6_hdr->ip_src.__u6_addr.__u6_addr8[7] = (u_char)0x1b26;

ip6_hdr->ip_dst.__u6_addr.__u6_addr8[0] = (u_char)0xfe80;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[1] = (u_char)0;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[2] = (u_char)0;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[3] = (u_char)0;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[4] = (u_char)0x219;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[5] = (u_char)0x21ff;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[6] = (u_char)0xfed6;
ip6_hdr->ip_dst.__u6_addr.__u6_addr8[7] = (u_char)0xb76e;

ip6_hdr->ip_hl = 255;
ip6_hdr->ip_nh = IPPROTO_UDP;
ip6_hdr->ip_len = htons (wLen + UDP_LENGTH);
ip6_hdr->ip_flags[0] = 0x06 << 4;

wTotolLen = ETHER_LENGTH + IP6_HDR_LEN_M + wLen + UDP_LENGTH;
memcpy( abData + ETHER_LENGTH + IP6_HDR_LEN_M + UDP_LENGTH, pData, wLen);//IP6_HDR_LEN_M = 40 ,UDP_LENGTH = 8

int n = pcapSend(hdev, abData, wTotolLen);//返回0应该是成功

[码农wuhb]

刚才的问题解决了,是IP地址填了不对,还有个问题想问下大家,ipv4中udp报文存在着一个伪首部，是32位的ＩＰ地址和checksum,在ipv6下应该怎么填，我没填伪首部报文用ethreal抓到了，但是显示checksum不对．哪位大侠能帮下忙告诉我ipv6中udp报文存在着一个伪首部怎么填,checksum怎么计算机