请教：更改底层数据接收程后引起linux系统崩溃！
请教高手，我从int netif_receive_skb(struct sk_buff *skb)设置一个自定义的函数指针（钩子），加载一下自定义模块，想把从特定接口过来的数据包截下来，进行一定加工处理后（主要是加封装包头），再从另外一个接口发送出去，发送之前我查询了路由表，找到路由，然后用下边语句发送：
 
  if (dst->hh){
printk("cached\n");
ret = neigh_hh_output(dst->hh, skb);
if(ret < 0)
printk("send fail!\n");
return ret;
}
else if (dst->neighbour){
printk("no cached\n");
ret = dst->neighbour->output(skb);
if(ret < 0)
printk("send fail!\n");
return ret;
}

  调试时，如果cach命中，就能正确的发送到目的地址，如果cach没命中，只要不用进行arp解析也没事，也能正常发送，但是只要一进行arp解析，系统就崩溃，不是在发arp请求是崩，就是在收到arp应答时崩：

45,00,00,6c,00,00,00,00,
40,11,f6,95,c0,a8,01,02,
c0,a8,01,99,00,00,14,7f,
00,58,6c,03,00,20,00,50,
00,00,00,00,06,00,03,7f,
46,e0,29,00,45,00,00,3c,
89,21,00,00,80,01,2c,d8,
81,00,00,00,c0,a8,01,de,
c0,a8,01,99,08,00,d6,5b,
05,00,72,00,61,62,63,64,
65,66,67,68,69,6a,6b,6c,
6d,6e,6f,70,71,72,73,74,
75,76,77,61,62,63,64,65,
66,67,68,69,
no cached
CPU 0 Unable to handle kernel paging request at virtual address 0000000c, epc == 80195128, ra == 80195130
Oops[#1]:
Cpu 0
$ 0 : 00000000 00000000 00000000 00000000
$ 4 : 810612c0 810612c0 00000000 00000000
$ 8 : 00000000 00000000 00000000 00000000
$12 : 00000000 3b9aca00 00200200 00000000
$16 : 8792a200 878bc8a0 878bc8a4 00000002
$20 : 8792f000 c0a80199 87995820 00000003
$24 : 00000000 8000e2a0  
$28 : 80214000 80215cf0 00200200 80195130
Hi : 00000082
Lo : 00000000
epc : 80195128 arp_solicit+0xa0/0x1ec
  Tainted: P  
ra : 80195130 arp_solicit+0xa8/0x1ec
Status: 1100ff03 KERNEL EXL IE 
Cause : 80800008
BadVA : 0000000c
PrId : 0001974c (MIPS 74Kc)
Modules linked in: quick_trans ath_pktlog(P) umac ath_dev(P) ath_dfs(P) ath_rate_atheros(P) ath_hal(P) asf(P) adf(P) private_m
essage usb_storage ehci_hcd usbcore athrs_gmac
Process swapper (pid: 0, threadinfo=80214000, task=80216000, tls=00000000)
Stack : 8792a200 8014ac10 8792a200 808815e0 80257568 802574e8 00000020 8792a200
  878bc8a0 8014e0e0 00000004 8792a200 87995820 00000000 80215d70 80257568
  802574e8 80257468 802573e8 8015f770 ffffaa1d 80221a58 80221a5c 80221a74
  802571e0 00000100 8015f4d0 8002dbc8 00000000 00000040 00000000 00000000
  80215d70 80215d70 00000001 00000100 802570b0 00000000 00000004 0000000a
  ...
Call Trace:
[<80195128>] arp_solicit+0xa0/0x1ec
[<8015f770>] neigh_timer_handler+0x2a0/0x440
[<8002dbc8>] run_timer_softirq+0x14c/0x1d8
[<800296e8>] __do_softirq+0xb0/0x148
[<800297c8>] do_softirq+0x48/0x6c
[<80003ad8>] plat_irq_dispatch+0x58/0x480
[<8000670c>] ret_from_irq+0x0/0x4
[<80006284>] r4k_wait_irqoff+0x20/0x24
[<8000853c>] cpu_idle+0x24/0x44
[<80227a5c>] start_kernel+0x340/0x35c


find route success

45,00,00,38,00,00,00,00,
40,11,f8,db,c0,a8,00,6f,
c0,a8,00,1a,00,00,14,7f,
00,24,26,d4,00,20,00,50,
00,00,00,00,06,00,03,7f,
42,07,81,00,00,00,f5,81,
80,00,00,00,00,00,00,00,
no cached
CPU 0 Unable to handle kernel paging request at virtual address 00000000, epc == 80161ac0, ra == 80161964
Oops[#1]:
Cpu 0
$ 0 : 00000000 00000061 00000000 00000000
$ 4 : 802274a0 00000000 00000000 00014733
$ 8 : 0000dc45 8795684a 00000010 879312c0
$12 : 0000006b fff7ffff 00200200 00100100
$16 : 8702b540 87956870 87956820 00000002
$20 : 00000001 00000001 87956844 00000000
$24 : 00000010 801984e4 &