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增加offload说明 修改mark位点

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chn
2019-09-20 12:05:36 +08:00
parent 508ba59c92
commit d4940f3c2c
3 changed files with 16 additions and 45 deletions
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40
src/xmurp-ua.c
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@@ -139,8 +139,6 @@ inline u_int8_t skb_scan(char *data_start, char *data_end)
// ip地址、端口号、iph->tot_len需要网络顺序到主机顺序的转换。校验和时，除长度字段外，不需要手动进行网络顺序和主机顺序的转换。
unsigned int hook_funcion(void *priv, struct sk_buff *skb, const struct nf_hook_state *state)
{
static u_int32_t debug_n = 0;
register struct tcphdr *tcph;
register struct iphdr *iph;
register char *data_start, *data_end;
@@ -155,57 +153,21 @@ unsigned int hook_funcion(void *priv, struct sk_buff *skb, const struct nf_hook_
// 过滤发往外网的HTTP请求的包，且要求包的应用层内容不短于3字节
if(skb == 0)
{
// if(debug_n < 10)
// printk("xmurp-ua warning, something maybe wrong.\n");
return NF_ACCEPT;
}
iph = ip_hdr(skb);
if((ntohl(iph->daddr) & 0xffff0000) == 0xc0a80000)
{
// if(debug_n < 10)
// printk("xmurp-ua bypass as dst in local net.\n");
return NF_ACCEPT;
}
if(iph->protocol != IPPROTO_TCP)
{
// if(debug_n < 10)
// printk("xmurp-ua bypass as protocol not tcp.\n");
return NF_ACCEPT;
}
tcph = tcp_hdr(skb);
if(ntohs(tcph->dest) != 80)
{
// if(debug_n < 10)
// printk("xmurp-ua bypass as port %u not 80.\n", ntohs(tcph->dest));
return NF_ACCEPT;
}
data_start = (char *)tcph + tcph->doff * 4;
data_end = (char *)tcph + ntohs(iph->tot_len) - iph->ihl * 4;
debug_n++;
if(data_end - data_start < 4)
{
if(debug_n < 10)
printk("xmurp-ua bypass as data too short.");
if(debug_n < 10)
printk("xmurp-ua tcph -> doff = %x, iph -> tot_len = %x, iph -> ihl = %x.\n", tcph -> doff, iph -> tot_len, iph -> ihl);
if(debug_n < 10)
printk("xmurp-ua iph -> tot_len - iph, %x.\n", (char*)&(iph -> tot_len) - (char*)iph);
if(debug_n < 10)
printk("xmurp-ua iph -> tot_len %x.\n", *((u_int16_t*)&(iph -> tot_len)));
if(debug_n < 10)
printk("xmurp-ua iph message %x %x %x %x %x %x %x %x %x %x %x.\n", iph -> version, iph -> ihl, iph -> tos, iph -> tot_len, iph -> id, iph -> frag_off, iph -> ttl, iph -> protocol, iph -> check, iph -> saddr, iph -> daddr);
return NF_ACCEPT;
}
if(skb->mark & 0x00000001)
{
if(debug_n < 10)
printk("xmurp-ua bypass as mark.\n");
if(skb->mark & 0x100)
return NF_ACCEPT;
}
if(debug_n++ < 10)
printk("xmurp-ua catch a package.\n");
// 决定是否发送到下一层
if(catch_next_frag && iph->saddr == saddr && iph->daddr == daddr &&