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[IPV4]: Fix secondary IP addresses after promotion 

This patch fixes the problem with promoting aliases when:
a) a single primary and > 1 secondary addresses
b) multiple primary addresses each with at least one secondary address

Based on earlier efforts from Brian Pomerantz <bapper@piratehaven.org>,
Patrick McHardy <kaber@trash.net> and Thomas Graf <tgraf@suug.ch>

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim 2005-11-22 14:47:37 -08:00 committed by David S. Miller
parent c27bd492fd
commit 0ff60a4567
3 changed files with 34 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/route.h
View File

@ -126,6 +126,9 @@ extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
extern void ip_rt_get_source(u8 *src, struct rtable *rt);
extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
struct in_ifaddr;
extern void fib_add_ifaddr(struct in_ifaddr *);
static inline void ip_rt_put(struct rtable * rt)
{
if (rt)

40
net/ipv4/devinet.c
View File

@ -234,7 +234,10 @@ 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;
struct in_ifaddr *ifa, *ifa1 = *ifap;
struct in_ifaddr *last_prim = in_dev->ifa_list;
struct in_ifaddr *prev_prom = NULL;
int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
ASSERT_RTNL();
@ -243,18 +246,22 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
**/
if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
struct in_ifaddr *ifa;
struct in_ifaddr **ifap1 = &ifa1->ifa_next;
while ((ifa = *ifap1) != NULL) {
if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
ifa1->ifa_scope <= ifa->ifa_scope)
last_prim = ifa;
if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
ifa1->ifa_mask != ifa->ifa_mask ||
!inet_ifa_match(ifa1->ifa_address, ifa)) {
ifap1 = &ifa->ifa_next;
prev_prom = ifa;
continue;
}
if (!IN_DEV_PROMOTE_SECONDARIES(in_dev)) {
if (!do_promote) {
*ifap1 = ifa->ifa_next;
rtmsg_ifa(RTM_DELADDR, ifa);
@ -283,19 +290,32 @@ static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
*/
rtmsg_ifa(RTM_DELADDR, ifa1);
notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);
if (promote) {
if (prev_prom) {
prev_prom->ifa_next = promote->ifa_next;
promote->ifa_next = last_prim->ifa_next;
last_prim->ifa_next = promote;
}
promote->ifa_flags &= ~IFA_F_SECONDARY;
rtmsg_ifa(RTM_NEWADDR, promote);
notifier_call_chain(&inetaddr_chain, NETDEV_UP, promote);
for (ifa = promote->ifa_next; ifa; ifa = ifa->ifa_next) {
if (ifa1->ifa_mask != ifa->ifa_mask ||
!inet_ifa_match(ifa1->ifa_address, ifa))
continue;
fib_add_ifaddr(ifa);
}
}
if (destroy) {
inet_free_ifa(ifa1);
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)

2
net/ipv4/fib_frontend.c
View File

@ -407,7 +407,7 @@ static void fib_magic(int cmd, int type, u32 dst, int dst_len, struct in_ifaddr
tb->tb_delete(tb, &req.rtm, &rta, &req.nlh, NULL);
}
static void fib_add_ifaddr(struct in_ifaddr *ifa)
void fib_add_ifaddr(struct in_ifaddr *ifa)
{
struct in_device *in_dev = ifa->ifa_dev;
struct net_device *dev = in_dev->dev;