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[IPV4]: Convert address addition to new netlink api

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Adds rtm_to_ifaddr() transforming a netlink message to a
struct in_ifaddr. Fixes various unvalidated netlink attributes
causing memory corruptions when left empty by userspace
applications.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-08-04 23:03:53 -07:00 committed by David S. Miller
parent bf8b79e444
commit 5c7539781d
1 changed files with 77 additions and 35 deletions
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112
net/ipv4/devinet.c
View File

@ -62,6 +62,7 @@
#include <net/ip.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/netlink.h>
struct ipv4_devconf ipv4_devconf = {
.accept_redirects = 1,
@ -78,6 +79,14 @@ static struct ipv4_devconf ipv4_devconf_dflt = {
.accept_source_route = 1,
};
static struct nla_policy ifa_ipv4_policy[IFA_MAX+1] __read_mostly = {
[IFA_LOCAL] = { .type = NLA_U32 },
[IFA_ADDRESS] = { .type = NLA_U32 },
[IFA_BROADCAST] = { .type = NLA_U32 },
[IFA_ANYCAST] = { .type = NLA_U32 },
[IFA_LABEL] = { .type = NLA_STRING },
};
static void rtmsg_ifa(int event, struct in_ifaddr *);
static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
@ -451,57 +460,90 @@ static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg
return -EADDRNOTAVAIL;
}
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
{
struct rtattr **rta = arg;
struct nlattr *tb[IFA_MAX+1];
struct in_ifaddr *ifa;
struct ifaddrmsg *ifm;
struct net_device *dev;
struct in_device *in_dev;
struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
struct in_ifaddr *ifa;
int rc = -EINVAL;
int err = -EINVAL;
ASSERT_RTNL();
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
if (err < 0)
goto errout;
if (ifm->ifa_prefixlen > 32 || !rta[IFA_LOCAL - 1])
goto out;
ifm = nlmsg_data(nlh);
if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
goto errout;
rc = -ENODEV;
if ((dev = __dev_get_by_index(ifm->ifa_index)) == NULL)
goto out;
rc = -ENOBUFS;
if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) {
in_dev = inetdev_init(dev);
if (!in_dev)
goto out;
dev = __dev_get_by_index(ifm->ifa_index);
if (dev == NULL) {
err = -ENODEV;
goto errout;
}
if ((ifa = inet_alloc_ifa()) == NULL)
goto out;
in_dev = __in_dev_get_rtnl(dev);
if (in_dev == NULL) {
in_dev = inetdev_init(dev);
if (in_dev == NULL) {
err = -ENOBUFS;
goto errout;
}
}
ifa = inet_alloc_ifa();
if (ifa == NULL) {
/*
* A potential indev allocation can be left alive, it stays
* assigned to its device and is destroy with it.
*/
err = -ENOBUFS;
goto errout;
}
in_dev_hold(in_dev);
if (tb[IFA_ADDRESS] == NULL)
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
if (!rta[IFA_ADDRESS - 1])
rta[IFA_ADDRESS - 1] = rta[IFA_LOCAL - 1];
memcpy(&ifa->ifa_local, RTA_DATA(rta[IFA_LOCAL - 1]), 4);
memcpy(&ifa->ifa_address, RTA_DATA(rta[IFA_ADDRESS - 1]), 4);
ifa->ifa_prefixlen = ifm->ifa_prefixlen;
ifa->ifa_mask = inet_make_mask(ifm->ifa_prefixlen);
if (rta[IFA_BROADCAST - 1])
memcpy(&ifa->ifa_broadcast,
RTA_DATA(rta[IFA_BROADCAST - 1]), 4);
if (rta[IFA_ANYCAST - 1])
memcpy(&ifa->ifa_anycast, RTA_DATA(rta[IFA_ANYCAST - 1]), 4);
ifa->ifa_flags = ifm->ifa_flags;
ifa->ifa_scope = ifm->ifa_scope;
in_dev_hold(in_dev);
ifa->ifa_dev = in_dev;
if (rta[IFA_LABEL - 1])
rtattr_strlcpy(ifa->ifa_label, rta[IFA_LABEL - 1], IFNAMSIZ);
ifa->ifa_dev = in_dev;
ifa->ifa_local = nla_get_u32(tb[IFA_LOCAL]);
ifa->ifa_address = nla_get_u32(tb[IFA_ADDRESS]);
if (tb[IFA_BROADCAST])
ifa->ifa_broadcast = nla_get_u32(tb[IFA_BROADCAST]);
if (tb[IFA_ANYCAST])
ifa->ifa_anycast = nla_get_u32(tb[IFA_ANYCAST]);
if (tb[IFA_LABEL])
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
else
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
rc = inet_insert_ifa(ifa);
out:
return rc;
return ifa;
errout:
return ERR_PTR(err);
}
static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct in_ifaddr *ifa;
ASSERT_RTNL();
ifa = rtm_to_ifaddr(nlh);
if (IS_ERR(ifa))
return PTR_ERR(ifa);
return inet_insert_ifa(ifa);
}
/*