Re: [PATCH]ip_options_fragment() has no effect on fragmentation

[Patrick McHardy <kaber@trash.net>]

Wei Yongjun wrote:
> [1]Summary of the problem:
> ip_options_fragment() has no effect on fragmentation
> 
> [2]Full description of the problem:
> When I send IPv4 packet(contain Record Route Option) which need to be
> fragmented to the router, the router can not fragment it correctly.
> After fragmented by router, the second fragmentation still contain
> Record Route Option. Refer to RFC791, Record Route Option must Not be
> copied on fragmentation, goes in first fragment only.
> ip_options_fragment() is the implemental function, but there are some
> BUGs in it:
> 
> ip_option.c: line 207:
> void ip_options_fragment(struct sk_buff * skb)
> {
> unsigned char * optptr = skb->nh.raw;
> struct ip_options * opt = &(IPCB(skb)->opt);
> ...
> 
> optptr get a error pointer to the ipv4 options, correct is as following:
> 
> unsigned char * optptr = skb->nh.raw + sizeof(struct iphdr);
> 
> By the way, ip_options_fragment() just fill options not allowed in
> fragments with NOOPs, does not delete the space of the options,
> following patch has corrected the problem.

Please split the optptr fix and your enhancements in two patches and
send them to netdev@vger.kernel.org.

BTW, your mailer corrupts whitespace.