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devinet: use in_dev_for_each_ifa_rcu in more places 

This also replaces spots that used for_primary_ifa().

for_primary_ifa() aborts the loop on the first secondary address seen.

Replace it with either the rcu or rtnl variant of in_dev_for_each_ifa(),
but two places will now also consider secondary addresses too:
inet_addr_onlink() and inet_ifa_byprefix().

I do not understand why they should ignore secondary addresses.

Why would a secondary address not be considered 'on link'?
When matching a prefix, why ignore a matching secondary address?

Other places get converted as well, but gain "->flags & SECONDARY" check.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2019-05-31 18:27:05 +02:00 committed by David S. Miller
parent ef11db3310
commit d519e8708b
1 changed files with 19 additions and 8 deletions
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27
net/ipv4/devinet.c
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@ -327,15 +327,17 @@ static void inetdev_destroy(struct in_device *in_dev)
int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
{
const struct in_ifaddr *ifa;
rcu_read_lock();
for_primary_ifa(in_dev) {
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (inet_ifa_match(a, ifa)) {
if (!b || inet_ifa_match(b, ifa)) {
rcu_read_unlock();
return 1;
}
}
} endfor_ifa(in_dev);
}
rcu_read_unlock();
return 0;
}
@ -580,12 +582,14 @@ EXPORT_SYMBOL(inetdev_by_index);
struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
__be32 mask)
{
struct in_ifaddr *ifa;
ASSERT_RTNL();
for_primary_ifa(in_dev) {
in_dev_for_each_ifa_rtnl(ifa, in_dev) {
if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
return ifa;
} endfor_ifa(in_dev);
}
return NULL;
}
@ -1245,17 +1249,22 @@ out:
static __be32 in_dev_select_addr(const struct in_device *in_dev,
int scope)
{
for_primary_ifa(in_dev) {
const struct in_ifaddr *ifa;
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (ifa->ifa_flags & IFA_F_SECONDARY)
continue;
if (ifa->ifa_scope != RT_SCOPE_LINK &&
ifa->ifa_scope <= scope)
return ifa->ifa_local;
} endfor_ifa(in_dev);
}
return 0;
}
__be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
{
const struct in_ifaddr *ifa;
__be32 addr = 0;
struct in_device *in_dev;
struct net *net = dev_net(dev);
@ -1266,7 +1275,9 @@ __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
if (!in_dev)
goto no_in_dev;
for_primary_ifa(in_dev) {
in_dev_for_each_ifa_rcu(ifa, in_dev) {
if (ifa->ifa_flags & IFA_F_SECONDARY)
continue;
if (ifa->ifa_scope > scope)
continue;
if (!dst || inet_ifa_match(dst, ifa)) {
@ -1275,7 +1286,7 @@ __be32 inet_select_addr(const struct net_device *dev, __be32 dst, int scope)
}
if (!addr)
addr = ifa->ifa_local;
} endfor_ifa(in_dev);
}
if (addr)
goto out_unlock;