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Date: Tue, 29 Mar 2011 13:00:32 +0300
From: Timo Teräs <timo.teras@....fi>
To: Eric Dumazet <eric.dumazet@...il.com>
CC: netdev@...r.kernel.org, Doug Kehn <rdkehn@...oo.com>
Subject: Re: [PATCH] net: gre: provide multicast mappings for ipv4 and ipv6
On 03/29/2011 12:11 PM, Eric Dumazet wrote:
> Le mardi 29 mars 2011 à 11:40 +0300, Timo Teräs a écrit :
>> My commit 6d55cb91a0020ac0 (gre: fix hard header destination
>> address checking) broke multicast.
>>
>> The reason is that ip_gre used to get ipgre_header() calls with
>> zero destination if we have NOARP or multicast destination. Instead
>> the actual target was decided at ipgre_tunnel_xmit() time based on
>> per-protocol dissection.
>>
>> Instead of allowing the "abuse" of ->header() calls with invalid
>> destination, this creates multicast mappings for ip_gre. This also
>> fixes "ip neigh show nud noarp" to display the proper multicast
>> mappings used by the gre device.
>>
>> Reported-by: Doug Kehn <rdkehn@...oo.com>
>> Signed-off-by: Timo Teräs <timo.teras@....fi>
>> ---
>> Compile tested only. Doug tested IPv4 side with the earlier patch.
>
>
>> +static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
>> + const unsigned char *broadcast, char *buf)
>> +{
>> + if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
>> + memcpy(buf, broadcast, 4);
>> + } else {
>> + /* v4mapped? */
>> + if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
>> + (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
>> + return -EINVAL;
>
> if (ipv6_addr_v4mapped(addr))
>
>
>> + memcpy(buf, &addr->s6_addr32[3], 4);
>> + }
>> + return 0;
>> +}
I wanted to put the function same header as all other similar ones:
net/if_inet6.h. However, ipv6_addr_v4mapped() is defined in net/ipv6.h
which includes net/if_inet6.h. So I can't really use that function there.
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