回复 10# 世事皆虚幻
目前最新进展：调用以下函数，可以向上层发送 SYN 报文，服务端会向客户端发送 SYN+ACK, 但是该函数会卡在 dst_input, 这个函数出不来，咋回事儿呢？
int SendTcpPacket(__be32 sip, __be16 sport, __be32 dip, __be16 dport, __be32 seq, __u8 syn, __u8 fin, __u8 rst, __u8 ack, __be32 seq_ack)
{
struct dst_entry* dest = NULL;
struct sk_buff *skb;
struct tcphdr* tcph;
struct iphdr *iph;
int ip_payload_size;
int result;
skb = alloc_skb(MAX_TCP_HEADER, GFP_ATOMIC|__GFP_ZERO);
if (skb == NULL)
{
printk(KERN_ALERT"Failed to alloc_skb\n");
return -1;
}
skb_reserve(skb, sizeof(struct iphdr) + sizeof(struct tcphdr));
// TCP header
tcph = (struct tcphdr *)skb_push(skb, sizeof(struct tcphdr));
tcph->source= sport;
tcph->dest = dport;
tcph->doff = (sizeof(struct tcphdr) >> 2);
tcph->psh = 0;
tcph->seq = seq;
tcph->syn = syn;
tcph->fin = fin;
tcph->rst = rst;
tcph->ack = ack;
tcph->ack_seq = seq_ack;
tcph->window= htons(0xFFFF);
skb_reset_transport_header(skb);
// IP Header
iph = (struct iphdr *)skb_push(skb, sizeof(struct iphdr));
iph->ihl = (sizeof(struct iphdr) >> 2);
iph->version= 4;
iph->tot_len= htons(skb->len);
iph->ttl = 64;
iph->tos = 0;
iph->protocol = IPPROTO_TCP;
iph->saddr = sip;
iph->daddr = dip;
ip_send_check(iph);
skb_reset_network_header(skb);
ip_payload_size = skb->len - sizeof(struct iphdr);
skb->csum = skb_checksum(skb, sizeof(struct iphdr), ip_payload_size, 0);
tcph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, ip_payload_size, iph->protocol, skb->csum);
skb->ip_summed = CHECKSUM_UNNECESSARY;
//skb->ip_summed = CHECKSUM_NONE;
skb->pkt_type = PACKET_HOST;
{
struct rtable *rt; /* Route to the other host */
struct flowi fi;
memset(&fi, 0, sizeof(struct flowi));
fi.fl4_dst = sip;
//fi.proto = IPPROTO_IPIP;
if (0 != ip_route_output_key(&init_net, &rt, &fi))
{
return -1;
}
if (NULL == rt)
{
return -1;
}
dest = &rt->u.dst;
//dev_hold(dest->dev);
}
skb->dev = dest->dev;
skb_dst_set(skb, dest);
result = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dest->dev);
if (unlikely(result))
{
// Host Unreachable
printk(KERN_ALERT"Failed to ip_route_input\n");
return -1;
}
result = dst_input(skb);
if (result != NET_RX_SUCCESS)
{
kfree_skb(skb);
printk(KERN_ALERT"Failed to send packet. ErrCode=%d\n", result);
}
else
{
printk(KERN_ALERT"Send packet succeeded from %pI4:%d to %pI4:%d\n", &sip, ntohs(sport), &dip, ntohs(dport));
}
return 0;
}
结贴，已搞定，多谢关注~ 回复 12# 世事皆虚幻
欢迎分享一下解决的方法。
卡在？
难道产生了递归调用，要不然总会有个结果出来吧？
（没有跟踪具体上下文）
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