the current behavior is when an IP is added to an interface, the primary
or secondary attributes is depending on the order of ip added to the interface
the first IP will be primary and second, third,... or alias IP will be secondary
if the IP subnet matches
this patch add the flexiblity to allow user to specify an argument 'primary' or
'secondary'
(use 'ip addr add ip/mask primary|secondary dev ethX ' from iproute2 for
example) to specify
an IP address to be primary or secondary.
the reason for this patch is that we have a multi blade cluster platform
sharing 'floating management ip'
and also that each blade has its own management ip on the management interface,
so whichever blade in the
cluster becomes primary blade, the 'floating mangaement ip' follows it, and we
want any of our traffic
originated from the primary blade source from the 'floating management ip' for
consistency. but in this
case, since the local blade management ip is always the primary ip on the
mangaement interface and 'floating
management ip' is always secondary, kernel always choose the primary ip as
source ip address. thus we would
like to add the flexibility in kernel to allow us to specify which ip to be
primary or secondary.
Signed-off-by: Vincent Li <vincent.mc...@gmail.com>
---
net/ipv4/devinet.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a1b5bcb..bfc702a 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -440,9 +440,11 @@ static int __inet_insert_ifa(struct in_ifaddr *ifa, struct
nlmsghdr *nlh,
return 0;
}
- ifa->ifa_flags &= ~IFA_F_SECONDARY;
last_primary = &in_dev->ifa_list;
+ if((*last_primary) == NULL)
+ ifa->ifa_flags &= ~IFA_F_SECONDARY;
+
for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
ifap = &ifa1->ifa_next) {
if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
@@ -458,7 +460,10 @@ static int __inet_insert_ifa(struct in_ifaddr *ifa, struct
nlmsghdr *nlh,
inet_free_ifa(ifa);
return -EINVAL;
}
- ifa->ifa_flags |= IFA_F_SECONDARY;
+ if (!(ifa->ifa_flags & IFA_F_SECONDARY))
+ ifa1->ifa_flags |= IFA_F_SECONDARY;
+ else
+ ifa->ifa_flags |= IFA_F_SECONDARY;
}
}
--
1.7.9.5
--
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