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-rw-r--r--drivers/net/ppp/ppp_generic.c115
1 files changed, 112 insertions, 3 deletions
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
index 59077c86ba0e..8dedafa1a95d 100644
--- a/drivers/net/ppp/ppp_generic.c
+++ b/drivers/net/ppp/ppp_generic.c
@@ -46,6 +46,7 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/file.h>
#include <asm/unaligned.h>
#include <net/slhc_vj.h>
#include <linux/atomic.h>
@@ -186,6 +187,7 @@ struct channel {
struct ppp_config {
struct file *file;
s32 unit;
+ bool ifname_is_set;
};
/*
@@ -286,6 +288,7 @@ static int unit_get(struct idr *p, void *ptr);
static int unit_set(struct idr *p, void *ptr, int n);
static void unit_put(struct idr *p, int n);
static void *unit_find(struct idr *p, int n);
+static void ppp_setup(struct net_device *dev);
static const struct net_device_ops ppp_netdev_ops;
@@ -964,7 +967,7 @@ static struct pernet_operations ppp_net_ops = {
.size = sizeof(struct ppp_net),
};
-static int ppp_unit_register(struct ppp *ppp, int unit)
+static int ppp_unit_register(struct ppp *ppp, int unit, bool ifname_is_set)
{
struct ppp_net *pn = ppp_pernet(ppp->ppp_net);
int ret;
@@ -994,7 +997,8 @@ static int ppp_unit_register(struct ppp *ppp, int unit)
}
ppp->file.index = ret;
- snprintf(ppp->dev->name, IFNAMSIZ, "ppp%i", ppp->file.index);
+ if (!ifname_is_set)
+ snprintf(ppp->dev->name, IFNAMSIZ, "ppp%i", ppp->file.index);
ret = register_netdevice(ppp->dev);
if (ret < 0)
@@ -1043,7 +1047,7 @@ static int ppp_dev_configure(struct net *src_net, struct net_device *dev,
ppp->active_filter = NULL;
#endif /* CONFIG_PPP_FILTER */
- err = ppp_unit_register(ppp, conf->unit);
+ err = ppp_unit_register(ppp, conf->unit, conf->ifname_is_set);
if (err < 0)
return err;
@@ -1052,6 +1056,99 @@ static int ppp_dev_configure(struct net *src_net, struct net_device *dev,
return 0;
}
+static const struct nla_policy ppp_nl_policy[IFLA_PPP_MAX + 1] = {
+ [IFLA_PPP_DEV_FD] = { .type = NLA_S32 },
+};
+
+static int ppp_nl_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+ if (!data)
+ return -EINVAL;
+
+ if (!data[IFLA_PPP_DEV_FD])
+ return -EINVAL;
+ if (nla_get_s32(data[IFLA_PPP_DEV_FD]) < 0)
+ return -EBADF;
+
+ return 0;
+}
+
+static int ppp_nl_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
+ struct ppp_config conf = {
+ .unit = -1,
+ .ifname_is_set = true,
+ };
+ struct file *file;
+ int err;
+
+ file = fget(nla_get_s32(data[IFLA_PPP_DEV_FD]));
+ if (!file)
+ return -EBADF;
+
+ /* rtnl_lock is already held here, but ppp_create_interface() locks
+ * ppp_mutex before holding rtnl_lock. Using mutex_trylock() avoids
+ * possible deadlock due to lock order inversion, at the cost of
+ * pushing the problem back to userspace.
+ */
+ if (!mutex_trylock(&ppp_mutex)) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (file->f_op != &ppp_device_fops || file->private_data) {
+ err = -EBADF;
+ goto out_unlock;
+ }
+
+ conf.file = file;
+ err = ppp_dev_configure(src_net, dev, &conf);
+
+out_unlock:
+ mutex_unlock(&ppp_mutex);
+out:
+ fput(file);
+
+ return err;
+}
+
+static void ppp_nl_dellink(struct net_device *dev, struct list_head *head)
+{
+ unregister_netdevice_queue(dev, head);
+}
+
+static size_t ppp_nl_get_size(const struct net_device *dev)
+{
+ return 0;
+}
+
+static int ppp_nl_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ return 0;
+}
+
+static struct net *ppp_nl_get_link_net(const struct net_device *dev)
+{
+ struct ppp *ppp = netdev_priv(dev);
+
+ return ppp->ppp_net;
+}
+
+static struct rtnl_link_ops ppp_link_ops __read_mostly = {
+ .kind = "ppp",
+ .maxtype = IFLA_PPP_MAX,
+ .policy = ppp_nl_policy,
+ .priv_size = sizeof(struct ppp),
+ .setup = ppp_setup,
+ .validate = ppp_nl_validate,
+ .newlink = ppp_nl_newlink,
+ .dellink = ppp_nl_dellink,
+ .get_size = ppp_nl_get_size,
+ .fill_info = ppp_nl_fill_info,
+ .get_link_net = ppp_nl_get_link_net,
+};
+
#define PPP_MAJOR 108
/* Called at boot time if ppp is compiled into the kernel,
@@ -1080,11 +1177,19 @@ static int __init ppp_init(void)
goto out_chrdev;
}
+ err = rtnl_link_register(&ppp_link_ops);
+ if (err) {
+ pr_err("failed to register rtnetlink PPP handler\n");
+ goto out_class;
+ }
+
/* not a big deal if we fail here :-) */
device_create(ppp_class, NULL, MKDEV(PPP_MAJOR, 0), NULL, "ppp");
return 0;
+out_class:
+ class_destroy(ppp_class);
out_chrdev:
unregister_chrdev(PPP_MAJOR, "ppp");
out_net:
@@ -2829,6 +2934,7 @@ static int ppp_create_interface(struct net *net, struct file *file, int *unit)
struct ppp_config conf = {
.file = file,
.unit = *unit,
+ .ifname_is_set = false,
};
struct net_device *dev;
struct ppp *ppp;
@@ -2840,6 +2946,7 @@ static int ppp_create_interface(struct net *net, struct file *file, int *unit)
goto err;
}
dev_net_set(dev, net);
+ dev->rtnl_link_ops = &ppp_link_ops;
rtnl_lock();
@@ -3046,6 +3153,7 @@ static void __exit ppp_cleanup(void)
/* should never happen */
if (atomic_read(&ppp_unit_count) || atomic_read(&channel_count))
pr_err("PPP: removing module but units remain!\n");
+ rtnl_link_unregister(&ppp_link_ops);
unregister_chrdev(PPP_MAJOR, "ppp");
device_destroy(ppp_class, MKDEV(PPP_MAJOR, 0));
class_destroy(ppp_class);
@@ -3104,4 +3212,5 @@ EXPORT_SYMBOL(ppp_register_compressor);
EXPORT_SYMBOL(ppp_unregister_compressor);
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV(PPP_MAJOR, 0);
+MODULE_ALIAS_RTNL_LINK("ppp");
MODULE_ALIAS("devname:ppp");