Messages in this thread | | | Date | Thu, 25 Dec 2003 16:26:05 +1300 | From | Dmytro Bablinyuk <> | Subject | IP packets routing |
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There is a little code that sends an IP packet from the kernel (see at the bottom)
The problem is that I have a errors (kernel 2.4.22):
dstip = ac198c13, 0 eth0 h_h_len :: 4 Allocated 48 bytes Length :: 12 ip_finish_output: bad unowned skb(nf_debug=10) = c0794120: POST_ROUTING skb: pf=2 (unowned) dev=eth0 len=32 PROTO=1 172.25.206.4:0 172.25.140.19:0 L=32 S=0x00 I=0 F=0x4000 T=128 retval :: 0
Could anybody please give me a hand on how to get around of that problem and to send IP packets out for 2.4.22 kernel.
Thank you
_IFCONFIG_OUTPUT_
/home # ifconfig eth0 Link encap:Ethernet HWaddr 00:0D:CA:01:00:04 inet addr:172.25.206.4 Bcast:172.25.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1375 errors:0 dropped:0 overruns:0 frame:0 TX packets:814 errors:0 dropped:0 overruns:0 carrier:0 collisions:1 txqueuelen:100 RX bytes:1055067 (1.0 MiB) TX bytes:118312 (115.5 KiB) Base address:0xe00 ...
__CODE_THAT_SENDS_THE_PACKET__
struct curr_lbts { int i; } curr_lbts; ...// __declaration__
struct rt_key key = {.dst = packet->data.dstip, .src=packet->data.srcip}; total_len = sizeof(struct iphdr) + sizeof(struct icmphdr) + sizeof(curr_lbts);
retval = ip_route_output_key(&rt, &key); printk("dstip = %x, %d\n", packet->data.dstip, retval); printk("%s\n", (rt->u.dst.dev)->name);
hh_len = ((rt->u.dst.dev->hard_header_len + 15) & ~15); printk ("h_h_len :: %d \n", sizeof(curr_lbts)); skb = dev_alloc_skb(total_len + hh_len); printk("Allocated %d bytes \n", total_len + hh_len); skb->priority = 0; skb->dst = dst_clone(&rt->u.dst); skb_reserve(skb, hh_len); skb->nh.iph = iph = (struct iphdr *) skb_put(skb, (sizeof(struct iphdr) + sizeof(struct icmphdr))); iph->ihl = 5; iph->version = 4; iph->tos = 0x00; iph->tot_len = htons(total_len); iph->id = 0; iph->frag_off = htons(IP_DF); iph->ttl = 128; iph->protocol = IPPROTO_ICMP; iph->saddr = rt->rt_src; iph->daddr = rt->rt_dst; iph->check = 0; iph->check = ip_fast_csum((unsigned char*) iph, iph->ihl); skb->h.icmph = icmph = (struct icmphdr *)((char *)iph + iph->ihl * 4); icmph->type = ICMP_ECHO; icmph->code = code; icmph->un.echo.id = 0x42; icmph->un.echo.sequence = 0x42; icmph->checksum = 0x0000; printk("Length :: %d \n", total_len - sizeof(struct iphdr)); data = (unsigned char*) icmph + sizeof(struct icmphdr) ; memcpy(skb_put(skb, sizeof(curr_lbts)), &curr_lbts, sizeof(curr_lbts)); icmph->checksum = ip_compute_csum((unsigned char *)icmph, total_len - (iph->ihl * 4)); retval = rt->u.dst.output(skb); printk("retval :: %d \n", retval);
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