[問題] kernel的值→ user space: C program

看板Linux作者hardware (硬體)時間10年前 (2015/07/07 23:08)推噓0(0推 0噓 1→)

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我在 net/core/dev.c int(myPacket)(struct sk_buff)=0; int netif_rx(struct sk_buff *skb) { if(myPacket) { myPacket(skb); } ... } extern int(myPacket)(strcut sk_buff)=0; EXPORT_SYMBOL(myPacket); 接著寫了一個 kernel module #include <linux/module.h> #include <linux/kernel.h> #include <linux/skbuff.h> #lnclude <linux/ip.h> extern int(*myPacket)(strcut sk_buff*)=0; int myPacketAnalyze(struct sk_buff* skb) { struct iphdr *iph; iph = ip_hdr(skb); printk("version = %d\n",iph->version); printk("header_len = %d\n",iph->ihl); printk("tos = %d\n",iph->tos); printk("total_len = %hu\n",ntohs(iph->tot_len)); printk("id = %hu\n",ntohs(iph->id)); printk("frag = %hu\n",(nthos(iph->frag_off))>>13); printk("frag_off = %hu\n",(ntohs(iph->frag_off))&0x1111111111111); printk("protocol = %d\n",iph->protocol); printk("ttl = %d\n",iph->ttl); printk("souce_addr = %u.%u.%u.%u\n",NIPQUAD(iph->saddr)); printk("dest_addr = %u.%u.%u.%u\n",NIPQUAD(iph->daddr)); } int init_module(void) { myPacket = myPacketAnalyze; return 0; } void cleanup_module(void) { myPacket = 0; } 在 var/log/message 印出來的值是對的有跑出我想要的結果但是這個值抓到我的C程式裡面 outputpkt.c 不曉得要怎麼做我找網路上有人說要用system call 有人有經驗嗎？謝謝~ -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.117.164.19 ※ 文章網址: https://www.ptt.cc/bbs/Linux/M.1436281704.A.EA6.html