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Validate required parameters in inet6_validate_link_af

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inet6_set_link_af requires that at least one of IFLA_INET6_TOKEN or
IFLA_INET6_ADDR_GET_MODE is passed. If none of them is passed, it
returns -EINVAL, which may cause do_setlink() to fail in the middle of
processing other commands and give the following warning message:

  A link change request failed with some changes committed already.
  Interface eth0 may have been left with an inconsistent configuration,
  please check.

Check the presence of at least one of them in inet6_validate_link_af to
detect invalid parameters at an early stage, before do_setlink does
anything. Also validate the address generation mode at an early stage.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maxim Mikityanskiy 2019-05-21 06:40:04 +00:00 committed by David S. Miller
parent 54dee40637
commit 7dc2bccab0
1 changed files with 35 additions and 22 deletions
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57
net/ipv6/addrconf.c
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@ -5661,18 +5661,6 @@ static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
[IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
};
static int inet6_validate_link_af(const struct net_device *dev,
const struct nlattr *nla)
{
struct nlattr *tb[IFLA_INET6_MAX + 1];
if (dev && !__in6_dev_get(dev))
return -EAFNOSUPPORT;
return nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
inet6_af_policy, NULL);
}
static int check_addr_gen_mode(int mode)
{
if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
@ -5693,14 +5681,44 @@ static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
return 1;
}
static int inet6_validate_link_af(const struct net_device *dev,
const struct nlattr *nla)
{
struct nlattr *tb[IFLA_INET6_MAX + 1];
struct inet6_dev *idev = NULL;
int err;
if (dev) {
idev = __in6_dev_get(dev);
if (!idev)
return -EAFNOSUPPORT;
}
err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
inet6_af_policy, NULL);
if (err)
return err;
if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
return -EINVAL;
if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
if (check_addr_gen_mode(mode) < 0)
return -EINVAL;
if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
return -EINVAL;
}
return 0;
}
static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
{
int err = -EINVAL;
struct inet6_dev *idev = __in6_dev_get(dev);
struct nlattr *tb[IFLA_INET6_MAX + 1];
if (!idev)
return -EAFNOSUPPORT;
int err;
if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
BUG();
@ -5714,15 +5732,10 @@ static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
if (check_addr_gen_mode(mode) < 0 ||
check_stable_privacy(idev, dev_net(dev), mode) < 0)
return -EINVAL;
idev->cnf.addr_gen_mode = mode;
err = 0;
}
return err;
return 0;
}
static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,