rtnetlink: Convert RTM_NEWLINK to per-netns RTNL.

Now, we are ready to convert rtnl_newlink() to per-netns RTNL;
rtnl_link_ops is protected by SRCU and netns is prefetched in
rtnl_newlink().

Let's register rtnl_newlink() with RTNL_FLAG_DOIT_PERNET and
push RTNL down as rtnl_nets_lock().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20241108004823.29419-10-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 1af187a4a3f1e3bf721bb6b1d1d19652eb140da5..30191d17add3171bb3087649f44ae44a3c94b33e 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -319,6 +319,26 @@ static void rtnl_nets_add(struct rtnl_nets *rtnl_nets, struct net *net)
        rtnl_nets->len++;
 }
 
+static void rtnl_nets_lock(struct rtnl_nets *rtnl_nets)
+{
+       int i;
+
+       rtnl_lock();
+
+       for (i = 0; i < rtnl_nets->len; i++)
+               __rtnl_net_lock(rtnl_nets->net[i]);
+}
+
+static void rtnl_nets_unlock(struct rtnl_nets *rtnl_nets)
+{
+       int i;
+
+       for (i = 0; i < rtnl_nets->len; i++)
+               __rtnl_net_unlock(rtnl_nets->net[i]);
+
+       rtnl_unlock();
+}
+
 static struct rtnl_link __rcu *__rcu *rtnl_msg_handlers[RTNL_FAMILY_MAX + 1];
 
 static inline int rtm_msgindex(int msgtype)
@@ -3903,9 +3923,7 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
                ops = rtnl_link_ops_get(kind, &ops_srcu_index);
 #ifdef CONFIG_MODULES
                if (!ops) {
-                       __rtnl_unlock();
                        request_module("rtnl-link-%s", kind);
-                       rtnl_lock();
                        ops = rtnl_link_ops_get(kind, &ops_srcu_index);
                }
 #endif
@@ -3968,7 +3986,9 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
                }
        }
 
+       rtnl_nets_lock(&rtnl_nets);
        ret = __rtnl_newlink(skb, nlh, ops, tgt_net, link_net, tbs, data, extack);
+       rtnl_nets_unlock(&rtnl_nets);
 
 put_net:
        rtnl_nets_destroy(&rtnl_nets);
@@ -6972,7 +6992,8 @@ static struct pernet_operations rtnetlink_net_ops = {
 };
 
 static const struct rtnl_msg_handler rtnetlink_rtnl_msg_handlers[] __initconst = {
-       {.msgtype = RTM_NEWLINK, .doit = rtnl_newlink},
+       {.msgtype = RTM_NEWLINK, .doit = rtnl_newlink,
+        .flags = RTNL_FLAG_DOIT_PERNET},
        {.msgtype = RTM_DELLINK, .doit = rtnl_dellink},
        {.msgtype = RTM_GETLINK, .doit = rtnl_getlink,
         .dumpit = rtnl_dump_ifinfo, .flags = RTNL_FLAG_DUMP_SPLIT_NLM_DONE},