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authorRolf Manderscheid <rvm@obsidianresearch.com>2007-12-10 23:38:41 +0300
committerRoland Dreier <rolandd@cisco.com>2008-01-26 01:15:37 +0300
commita9e527e3f9f4510e9f3450ca3bc51bc3ef2854fd (patch)
tree519458581cf3b8dd7c7a6d19c29572efb3405df1 /include/net/if_inet6.h
parent755807a296f77ca7c31dc000afdfe1e5172bbf72 (diff)
downloadlinux-a9e527e3f9f4510e9f3450ca3bc51bc3ef2854fd.tar.xz
IPoIB: improve IPv4/IPv6 to IB mcast mapping functions
An IPoIB subnet on an IB fabric that spans multiple IB subnets can't use link-local scope in multicast GIDs. The existing routines that map IP/IPv6 multicast addresses into IB link-level addresses hard-code the scope to link-local, and they also leave the partition key field uninitialised. This patch adds a parameter (the link-level broadcast address) to the mapping routines, allowing them to initialise both the scope and the P_Key appropriately, and fixes up the call sites. The next step will be to add a way to configure the scope for an IPoIB interface. Signed-off-by: Rolf Manderscheid <rvm@obsidianresearch.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'include/net/if_inet6.h')
-rw-r--r--include/net/if_inet6.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index 448eccb20638..b24508abb850 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h
@@ -269,18 +269,21 @@ static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
buf[0] = 0x00;
}
-static inline void ipv6_ib_mc_map(struct in6_addr *addr, char *buf)
+static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
+ const unsigned char *broadcast, char *buf)
{
+ unsigned char scope = broadcast[5] & 0xF;
+
buf[0] = 0; /* Reserved */
buf[1] = 0xff; /* Multicast QPN */
buf[2] = 0xff;
buf[3] = 0xff;
buf[4] = 0xff;
- buf[5] = 0x12; /* link local scope */
+ buf[5] = 0x10 | scope; /* scope from broadcast address */
buf[6] = 0x60; /* IPv6 signature */
buf[7] = 0x1b;
- buf[8] = 0; /* P_Key */
- buf[9] = 0;
+ buf[8] = broadcast[8]; /* P_Key */
+ buf[9] = broadcast[9];
memcpy(buf + 10, addr->s6_addr + 6, 10);
}
#endif