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| author | Timo Teräs <timo.teras@iki.fi> | 2011-03-29 00:40:53 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-30 09:10:47 +0200 |
| commit | 93ca3bb5df9bc8b2c60485e1cc6507c3d7c8e1fa (patch) | |
| tree | 6ccf21f8d1e4431c6be79c265fb1f9a722308f63 /include/net/ip.h | |
| parent | bridge: Fix compilation warning in function br_stp_recalculate_bridge_id() (diff) | |
| download | linux-93ca3bb5df9bc8b2c60485e1cc6507c3d7c8e1fa.tar.xz linux-93ca3bb5df9bc8b2c60485e1cc6507c3d7c8e1fa.zip | |
net: gre: provide multicast mappings for ipv4 and ipv6
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@yahoo.com>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Acked-by: Doug Kehn <rdkehn@yahoo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip.h')
| -rw-r--r-- | include/net/ip.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/ip.h b/include/net/ip.h index a4f631108c54..7c416583b710 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -339,6 +339,14 @@ static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, ch buf[16] = addr & 0x0f; } +static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) +{ + if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) + memcpy(buf, broadcast, 4); + else + memcpy(buf, &naddr, sizeof(naddr)); +} + #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) #include <linux/ipv6.h> #endif |