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[IPV4]: Primary and secondary addresses

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Add an option to make secondary IP addresses get promoted
when primary IP addresses are removed from the device.
It defaults to off to preserve existing behavior.

Signed-off-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harald Welte 2005-05-29 20:23:46 -07:00 committed by David S. Miller
parent 79158229b0
commit 8f937c6099
3 changed files with 32 additions and 5 deletions
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2
include/linux/inetdevice.h
View File

@ -29,6 +29,7 @@ struct ipv4_devconf
int no_xfrm;
int no_policy;
int force_igmp_version;
int promote_secondaries;
void *sysctl;
};
@ -71,6 +72,7 @@ struct in_device
#define IN_DEV_SEC_REDIRECTS(in_dev) (ipv4_devconf.secure_redirects || (in_dev)->cnf.secure_redirects)
#define IN_DEV_IDTAG(in_dev) ((in_dev)->cnf.tag)
#define IN_DEV_MEDIUM_ID(in_dev) ((in_dev)->cnf.medium_id)
#define IN_DEV_PROMOTE_SECONDARIES(in_dev) (ipv4_devconf.promote_secondaries || (in_dev)->cnf.promote_secondaries)
#define IN_DEV_RX_REDIRECTS(in_dev) \
((IN_DEV_FORWARD(in_dev) && \

1
include/linux/sysctl.h
View File

@ -399,6 +399,7 @@ enum
NET_IPV4_CONF_FORCE_IGMP_VERSION=17,
NET_IPV4_CONF_ARP_ANNOUNCE=18,
NET_IPV4_CONF_ARP_IGNORE=19,
NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
__NET_IPV4_CONF_MAX
};

34
net/ipv4/devinet.c
View File

@ -233,11 +233,14 @@ int inet_addr_onlink(struct in_device *in_dev, u32 a, u32 b)
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
int destroy)
{
struct in_ifaddr *promote = NULL;
struct in_ifaddr *ifa1 = *ifap;
ASSERT_RTNL();
/* 1. Deleting primary ifaddr forces deletion all secondaries */
/* 1. Deleting primary ifaddr forces deletion all secondaries
* unless alias promotion is set
**/
if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
struct in_ifaddr *ifa;
@ -251,11 +254,16 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
continue;
}
*ifap1 = ifa->ifa_next;
if (!IN_DEV_PROMOTE_SECONDARIES(in_dev)) {
*ifap1 = ifa->ifa_next;
rtmsg_ifa(RTM_DELADDR, ifa);
notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa);
inet_free_ifa(ifa);
rtmsg_ifa(RTM_DELADDR, ifa);
notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa);
inet_free_ifa(ifa);
} else {
promote = ifa;
break;
}
}
}
@ -281,6 +289,13 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
if (!in_dev->ifa_list)
inetdev_destroy(in_dev);
}
if (promote && IN_DEV_PROMOTE_SECONDARIES(in_dev)) {
/* not sure if we should send a delete notify first? */
promote->ifa_flags &= ~IFA_F_SECONDARY;
rtmsg_ifa(RTM_NEWADDR, promote);
notifier_call_chain(&inetaddr_chain, NETDEV_UP, promote);
}
}
static int inet_insert_ifa(struct in_ifaddr *ifa)
@ -1384,6 +1399,15 @@ static struct devinet_sysctl_table {
.proc_handler = &ipv4_doint_and_flush,
.strategy = &ipv4_doint_and_flush_strategy,
},
{
.ctl_name = NET_IPV4_CONF_PROMOTE_SECONDARIES,
.procname = "promote_secondaries",
.data = &ipv4_devconf.promote_secondaries,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &ipv4_doint_and_flush,
.strategy = &ipv4_doint_and_flush_strategy,
},
},
.devinet_dev = {
{