[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20241105020514.41963-4-kuniyu@amazon.com>
Date: Mon, 4 Nov 2024 18:05:09 -0800
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: Andrew Lunn <andrew+netdev@...n.ch>, Marc Kleine-Budde
<mkl@...gutronix.de>, Vincent Mailhol <mailhol.vincent@...adoo.fr>, "Daniel
Borkmann" <daniel@...earbox.net>, Nikolay Aleksandrov <razor@...ckwall.org>,
Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 3/8] rtnetlink: Add peer_type in struct rtnl_link_ops.
For veth, vxcan, and netkit, we need to prefetch the peer device's
netns in rtnl_newlink() for per-netns RTNL.
All of the three get the netns in the same way peer netlink attr tb:
1. Call rtnl_nla_parse_ifinfomsg()
2. Call ops->validate() (vxcan doesn't have)
3. Call rtnl_link_get_net_tb()
Let's add a new field peer_type to struct rtnl_link_ops and fetch
netns in peer attrbutes to add it to rtnl_nets in rtnl_newlink().
Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
include/net/rtnetlink.h | 2 ++
net/core/rtnetlink.c | 39 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 40 insertions(+), 1 deletion(-)
diff --git a/include/net/rtnetlink.h b/include/net/rtnetlink.h
index b9ed44b2d056..c3548da95ffa 100644
--- a/include/net/rtnetlink.h
+++ b/include/net/rtnetlink.h
@@ -85,6 +85,7 @@ void rtnl_nets_add(struct rtnl_nets *rtnl_nets, struct net *net);
* @srcu: Used internally
* @kind: Identifier
* @netns_refund: Physical device, move to init_net on netns exit
+ * @peer_type: Peer device specific netlink attribute number (e.g. VETH_INFO_PEER)
* @maxtype: Highest device specific netlink attribute number
* @policy: Netlink policy for device specific attribute validation
* @validate: Optional validation function for netlink/changelink parameters
@@ -126,6 +127,7 @@ struct rtnl_link_ops {
void (*setup)(struct net_device *dev);
bool netns_refund;
+ const unsigned char peer_type;
unsigned int maxtype;
const struct nla_policy *policy;
int (*validate)(struct nlattr *tb[],
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1bc8afcefc1e..48bd9e062550 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3798,6 +3798,37 @@ static int rtnl_newlink_create(struct sk_buff *skb, struct ifinfomsg *ifm,
goto out;
}
+static int rtnl_add_peer_net(struct rtnl_nets *rtnl_nets,
+ const struct rtnl_link_ops *ops,
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *tb[IFLA_MAX + 1];
+ struct net *net;
+ int err;
+
+ if (!data || !data[ops->peer_type])
+ return 0;
+
+ err = rtnl_nla_parse_ifinfomsg(tb, data[ops->peer_type], extack);
+ if (err < 0)
+ return err;
+
+ if (ops->validate) {
+ err = ops->validate(tb, NULL, extack);
+ if (err < 0)
+ return err;
+ }
+
+ net = rtnl_link_get_net_tb(tb);
+ if (IS_ERR(net))
+ return PTR_ERR(net);
+ if (net)
+ rtnl_nets_add(rtnl_nets, net);
+
+ return 0;
+}
+
static int __rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
const struct rtnl_link_ops *ops,
struct net *tgt_net, struct net *link_net,
@@ -3926,12 +3957,18 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (ret < 0)
goto put_ops;
}
+
+ if (ops->peer_type) {
+ ret = rtnl_add_peer_net(&rtnl_nets, ops, data, extack);
+ if (ret < 0)
+ goto put_ops;
+ }
}
tgt_net = rtnl_link_get_net_capable(skb, sock_net(skb->sk), tb, CAP_NET_ADMIN);
if (IS_ERR(tgt_net)) {
ret = PTR_ERR(tgt_net);
- goto put_ops;
+ goto put_net;
}
rtnl_nets_add(&rtnl_nets, tgt_net);
--
2.39.5 (Apple Git-154)
Powered by blists - more mailing lists