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authorFlorent Fourcot <florent.fourcot@wifirst.fr>2022-04-15 19:53:28 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-04-19 14:38:43 +0300
commit5ea08b5286f66ee5ac0150668c92d1718e83e1ad (patch)
tree74d2e74e0be5db207621e9caec0968c7a7c2696d /net/core
parentef2a7c9065cea4e3fbc0390e82d05141abbccd7f (diff)
downloadlinux-5ea08b5286f66ee5ac0150668c92d1718e83e1ad.tar.xz
rtnetlink: enable alt_ifname for setlink/newlink
buffer called "ifname" given in function rtnl_dev_get is always valid when called by setlink/newlink, but contains only empty string when IFLA_IFNAME is not given. So IFLA_ALT_IFNAME is always ignored This patch fixes rtnl_dev_get function with a remove of ifname argument, and move ifname copy in do_setlink when required. It extends feature of commit 76c9ac0ee878, "net: rtnetlink: add possibility to use alternative names as message handle"" CC: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Florent Fourcot <florent.fourcot@wifirst.fr> Signed-off-by: Brian Baboch <brian.baboch@wifirst.fr> Reviewed-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/rtnetlink.c69
1 files changed, 29 insertions, 40 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 2f538ab512d0..5899b1d2de14 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2644,17 +2644,23 @@ static int do_set_proto_down(struct net_device *dev,
static int do_setlink(const struct sk_buff *skb,
struct net_device *dev, struct ifinfomsg *ifm,
struct netlink_ext_ack *extack,
- struct nlattr **tb, char *ifname, int status)
+ struct nlattr **tb, int status)
{
const struct net_device_ops *ops = dev->netdev_ops;
+ char ifname[IFNAMSIZ];
int err;
err = validate_linkmsg(dev, tb, extack);
if (err < 0)
return err;
+ if (tb[IFLA_IFNAME])
+ nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
+ else
+ ifname[0] = '\0';
+
if (tb[IFLA_NET_NS_PID] || tb[IFLA_NET_NS_FD] || tb[IFLA_TARGET_NETNSID]) {
- const char *pat = ifname && ifname[0] ? ifname : NULL;
+ const char *pat = ifname[0] ? ifname : NULL;
struct net *net;
int new_ifindex;
@@ -3010,21 +3016,16 @@ errout:
}
static struct net_device *rtnl_dev_get(struct net *net,
- struct nlattr *ifname_attr,
- struct nlattr *altifname_attr,
- char *ifname)
-{
- char buffer[ALTIFNAMSIZ];
-
- if (!ifname) {
- ifname = buffer;
- if (ifname_attr)
- nla_strscpy(ifname, ifname_attr, IFNAMSIZ);
- else if (altifname_attr)
- nla_strscpy(ifname, altifname_attr, ALTIFNAMSIZ);
- else
- return NULL;
- }
+ struct nlattr *tb[])
+{
+ char ifname[ALTIFNAMSIZ];
+
+ if (tb[IFLA_IFNAME])
+ nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
+ else if (tb[IFLA_ALT_IFNAME])
+ nla_strscpy(ifname, tb[IFLA_ALT_IFNAME], ALTIFNAMSIZ);
+ else
+ return NULL;
return __dev_get_by_name(net, ifname);
}
@@ -3037,7 +3038,6 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct net_device *dev;
int err;
struct nlattr *tb[IFLA_MAX+1];
- char ifname[IFNAMSIZ];
err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
ifla_policy, extack);
@@ -3048,17 +3048,12 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto errout;
- if (tb[IFLA_IFNAME])
- nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
- else
- ifname[0] = '\0';
-
err = -EINVAL;
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
- dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
+ dev = rtnl_dev_get(net, tb);
else
goto errout;
@@ -3067,7 +3062,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
goto errout;
}
- err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
+ err = do_setlink(skb, dev, ifm, extack, tb, 0);
errout:
return err;
}
@@ -3156,8 +3151,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
- dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
- tb[IFLA_ALT_IFNAME], NULL);
+ dev = rtnl_dev_get(net, tb);
else if (tb[IFLA_GROUP])
err = rtnl_group_dellink(tgt_net, nla_get_u32(tb[IFLA_GROUP]));
else
@@ -3299,7 +3293,7 @@ static int rtnl_group_changelink(const struct sk_buff *skb,
for_each_netdev_safe(net, dev, aux) {
if (dev->group == group) {
- err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
+ err = do_setlink(skb, dev, ifm, extack, tb, 0);
if (err < 0)
return err;
}
@@ -3341,18 +3335,13 @@ replay:
if (err < 0)
return err;
- if (tb[IFLA_IFNAME])
- nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
- else
- ifname[0] = '\0';
-
ifm = nlmsg_data(nlh);
if (ifm->ifi_index > 0) {
link_specified = true;
dev = __dev_get_by_index(net, ifm->ifi_index);
} else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME]) {
link_specified = true;
- dev = rtnl_dev_get(net, NULL, tb[IFLA_ALT_IFNAME], ifname);
+ dev = rtnl_dev_get(net, tb);
} else {
link_specified = false;
dev = NULL;
@@ -3455,7 +3444,7 @@ replay:
status |= DO_SETLINK_NOTIFY;
}
- return do_setlink(skb, dev, ifm, extack, tb, ifname, status);
+ return do_setlink(skb, dev, ifm, extack, tb, status);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
@@ -3492,7 +3481,9 @@ replay:
if (!ops->alloc && !ops->setup)
return -EOPNOTSUPP;
- if (!ifname[0]) {
+ if (tb[IFLA_IFNAME]) {
+ nla_strscpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
+ } else {
snprintf(ifname, IFNAMSIZ, "%s%%d", ops->kind);
name_assign_type = NET_NAME_ENUM;
}
@@ -3664,8 +3655,7 @@ static int rtnl_getlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(tgt_net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
- dev = rtnl_dev_get(tgt_net, tb[IFLA_IFNAME],
- tb[IFLA_ALT_IFNAME], NULL);
+ dev = rtnl_dev_get(tgt_net, tb);
else
goto out;
@@ -3760,8 +3750,7 @@ static int rtnl_linkprop(int cmd, struct sk_buff *skb, struct nlmsghdr *nlh,
if (ifm->ifi_index > 0)
dev = __dev_get_by_index(net, ifm->ifi_index);
else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
- dev = rtnl_dev_get(net, tb[IFLA_IFNAME],
- tb[IFLA_ALT_IFNAME], NULL);
+ dev = rtnl_dev_get(net, tb);
else
return -EINVAL;